From fe0d1ca6ace06376625084b004ee533f2c2ea9d6 Mon Sep 17 00:00:00 2001 From: Darren Tucker Date: Thu, 20 Oct 2016 03:42:09 +1100 Subject: Remote channels .orig and .rej files. These files were incorrectly added during an OpenBSD sync. --- channels.c.orig | 4656 ------------------------------------------------------- channels.c.rej | 8 - channels.h.orig | 323 ---- channels.h.rej | 16 - 4 files changed, 5003 deletions(-) delete mode 100644 channels.c.orig delete mode 100644 channels.c.rej delete mode 100644 channels.h.orig delete mode 100644 channels.h.rej diff --git a/channels.c.orig b/channels.c.orig deleted file mode 100644 index ab2d9988a..000000000 --- a/channels.c.orig +++ /dev/null @@ -1,4656 +0,0 @@ -/* $OpenBSD: channels.c,v 1.355 2016/09/30 20:24:46 djm Exp $ */ -/* - * Author: Tatu Ylonen - * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland - * All rights reserved - * This file contains functions for generic socket connection forwarding. - * There is also code for initiating connection forwarding for X11 connections, - * arbitrary tcp/ip connections, and the authentication agent connection. - * - * As far as I am concerned, the code I have written for this software - * can be used freely for any purpose. Any derived versions of this - * software must be clearly marked as such, and if the derived work is - * incompatible with the protocol description in the RFC file, it must be - * called by a name other than "ssh" or "Secure Shell". - * - * SSH2 support added by Markus Friedl. - * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. - * Copyright (c) 1999 Dug Song. All rights reserved. - * Copyright (c) 1999 Theo de Raadt. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. - * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF - * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#include "includes.h" - -#include -#include -#include -#include -#include -#ifdef HAVE_SYS_TIME_H -# include -#endif - -#include -#include - -#include -#include -#include -#ifdef HAVE_STDINT_H -#include -#endif -#include -#include -#include -#include -#include -#include - -#include "openbsd-compat/sys-queue.h" -#include "xmalloc.h" -#include "ssh.h" -#include "ssh1.h" -#include "ssh2.h" -#include "ssherr.h" -#include "packet.h" -#include "log.h" -#include "misc.h" -#include "buffer.h" -#include "channels.h" -#include "compat.h" -#include "canohost.h" -#include "key.h" -#include "authfd.h" -#include "pathnames.h" - -/* -- channel core */ - -/* - * Pointer to an array containing all allocated channels. The array is - * dynamically extended as needed. - */ -static Channel **channels = NULL; - -/* - * Size of the channel array. All slots of the array must always be - * initialized (at least the type field); unused slots set to NULL - */ -static u_int channels_alloc = 0; - -/* - * Maximum file descriptor value used in any of the channels. This is - * updated in channel_new. - */ -static int channel_max_fd = 0; - - -/* -- tcp forwarding */ - -/* - * Data structure for storing which hosts are permitted for forward requests. - * The local sides of any remote forwards are stored in this array to prevent - * a corrupt remote server from accessing arbitrary TCP/IP ports on our local - * network (which might be behind a firewall). - */ -/* XXX: streamlocal wants a path instead of host:port */ -/* Overload host_to_connect; we could just make this match Forward */ -/* XXX - can we use listen_host instead of listen_path? */ -typedef struct { - char *host_to_connect; /* Connect to 'host'. */ - int port_to_connect; /* Connect to 'port'. */ - char *listen_host; /* Remote side should listen address. */ - char *listen_path; /* Remote side should listen path. */ - int listen_port; /* Remote side should listen port. */ - Channel *downstream; /* Downstream mux*/ -} ForwardPermission; - -/* List of all permitted host/port pairs to connect by the user. */ -static ForwardPermission *permitted_opens = NULL; - -/* List of all permitted host/port pairs to connect by the admin. */ -static ForwardPermission *permitted_adm_opens = NULL; - -/* Number of permitted host/port pairs in the array permitted by the user. */ -static int num_permitted_opens = 0; - -/* Number of permitted host/port pair in the array permitted by the admin. */ -static int num_adm_permitted_opens = 0; - -/* special-case port number meaning allow any port */ -#define FWD_PERMIT_ANY_PORT 0 - -/* special-case wildcard meaning allow any host */ -#define FWD_PERMIT_ANY_HOST "*" - -/* - * If this is true, all opens are permitted. This is the case on the server - * on which we have to trust the client anyway, and the user could do - * anything after logging in anyway. - */ -static int all_opens_permitted = 0; - - -/* -- X11 forwarding */ - -/* Maximum number of fake X11 displays to try. */ -#define MAX_DISPLAYS 1000 - -/* Saved X11 local (client) display. */ -static char *x11_saved_display = NULL; - -/* Saved X11 authentication protocol name. */ -static char *x11_saved_proto = NULL; - -/* Saved X11 authentication data. This is the real data. */ -static char *x11_saved_data = NULL; -static u_int x11_saved_data_len = 0; - -/* Deadline after which all X11 connections are refused */ -static u_int x11_refuse_time; - -/* - * Fake X11 authentication data. This is what the server will be sending us; - * we should replace any occurrences of this by the real data. - */ -static u_char *x11_fake_data = NULL; -static u_int x11_fake_data_len; - - -/* -- agent forwarding */ - -#define NUM_SOCKS 10 - -/* AF_UNSPEC or AF_INET or AF_INET6 */ -static int IPv4or6 = AF_UNSPEC; - -/* helper */ -static void port_open_helper(Channel *c, char *rtype); -static const char *channel_rfwd_bind_host(const char *listen_host); - -/* non-blocking connect helpers */ -static int connect_next(struct channel_connect *); -static void channel_connect_ctx_free(struct channel_connect *); - -/* -- channel core */ - -Channel * -channel_by_id(int id) -{ - Channel *c; - - if (id < 0 || (u_int)id >= channels_alloc) { - logit("channel_by_id: %d: bad id", id); - return NULL; - } - c = channels[id]; - if (c == NULL) { - logit("channel_by_id: %d: bad id: channel free", id); - return NULL; - } - return c; -} - -Channel * -channel_by_remote_id(int remote_id) -{ - Channel *c; - u_int i; - - for (i = 0; i < channels_alloc; i++) { - c = channels[i]; - if (c != NULL && c->remote_id == remote_id) - return c; - } - return NULL; -} - -/* - * Returns the channel if it is allowed to receive protocol messages. - * Private channels, like listening sockets, may not receive messages. - */ -Channel * -channel_lookup(int id) -{ - Channel *c; - - if ((c = channel_by_id(id)) == NULL) - return (NULL); - - switch (c->type) { - case SSH_CHANNEL_X11_OPEN: - case SSH_CHANNEL_LARVAL: - case SSH_CHANNEL_CONNECTING: - case SSH_CHANNEL_DYNAMIC: - case SSH_CHANNEL_OPENING: - case SSH_CHANNEL_OPEN: - case SSH_CHANNEL_INPUT_DRAINING: - case SSH_CHANNEL_OUTPUT_DRAINING: - case SSH_CHANNEL_ABANDONED: - case SSH_CHANNEL_MUX_PROXY: - return (c); - } - logit("Non-public channel %d, type %d.", id, c->type); - return (NULL); -} - -/* - * Register filedescriptors for a channel, used when allocating a channel or - * when the channel consumer/producer is ready, e.g. shell exec'd - */ -static void -channel_register_fds(Channel *c, int rfd, int wfd, int efd, - int extusage, int nonblock, int is_tty) -{ - /* Update the maximum file descriptor value. */ - channel_max_fd = MAXIMUM(channel_max_fd, rfd); - channel_max_fd = MAXIMUM(channel_max_fd, wfd); - channel_max_fd = MAXIMUM(channel_max_fd, efd); - - if (rfd != -1) - fcntl(rfd, F_SETFD, FD_CLOEXEC); - if (wfd != -1 && wfd != rfd) - fcntl(wfd, F_SETFD, FD_CLOEXEC); - if (efd != -1 && efd != rfd && efd != wfd) - fcntl(efd, F_SETFD, FD_CLOEXEC); - - c->rfd = rfd; - c->wfd = wfd; - c->sock = (rfd == wfd) ? rfd : -1; - c->efd = efd; - c->extended_usage = extusage; - - if ((c->isatty = is_tty) != 0) - debug2("channel %d: rfd %d isatty", c->self, c->rfd); -#ifdef _AIX - /* XXX: Later AIX versions can't push as much data to tty */ - c->wfd_isatty = is_tty || isatty(c->wfd); -#endif - - /* enable nonblocking mode */ - if (nonblock) { - if (rfd != -1) - set_nonblock(rfd); - if (wfd != -1) - set_nonblock(wfd); - if (efd != -1) - set_nonblock(efd); - } -} - -/* - * Allocate a new channel object and set its type and socket. This will cause - * remote_name to be freed. - */ -Channel * -channel_new(char *ctype, int type, int rfd, int wfd, int efd, - u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) -{ - int found; - u_int i; - Channel *c; - - /* Do initial allocation if this is the first call. */ - if (channels_alloc == 0) { - channels_alloc = 10; - channels = xcalloc(channels_alloc, sizeof(Channel *)); - for (i = 0; i < channels_alloc; i++) - channels[i] = NULL; - } - /* Try to find a free slot where to put the new channel. */ - for (found = -1, i = 0; i < channels_alloc; i++) - if (channels[i] == NULL) { - /* Found a free slot. */ - found = (int)i; - break; - } - if (found < 0) { - /* There are no free slots. Take last+1 slot and expand the array. */ - found = channels_alloc; - if (channels_alloc > 10000) - fatal("channel_new: internal error: channels_alloc %d " - "too big.", channels_alloc); - channels = xreallocarray(channels, channels_alloc + 10, - sizeof(Channel *)); - channels_alloc += 10; - debug2("channel: expanding %d", channels_alloc); - for (i = found; i < channels_alloc; i++) - channels[i] = NULL; - } - /* Initialize and return new channel. */ - c = channels[found] = xcalloc(1, sizeof(Channel)); - buffer_init(&c->input); - buffer_init(&c->output); - buffer_init(&c->extended); - c->path = NULL; - c->listening_addr = NULL; - c->listening_port = 0; - c->ostate = CHAN_OUTPUT_OPEN; - c->istate = CHAN_INPUT_OPEN; - c->flags = 0; - channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, 0); - c->notbefore = 0; - c->self = found; - c->type = type; - c->ctype = ctype; - c->local_window = window; - c->local_window_max = window; - c->local_consumed = 0; - c->local_maxpacket = maxpack; - c->remote_id = -1; - c->remote_name = xstrdup(remote_name); - c->remote_window = 0; - c->remote_maxpacket = 0; - c->force_drain = 0; - c->single_connection = 0; - c->detach_user = NULL; - c->detach_close = 0; - c->open_confirm = NULL; - c->open_confirm_ctx = NULL; - c->input_filter = NULL; - c->output_filter = NULL; - c->filter_ctx = NULL; - c->filter_cleanup = NULL; - c->ctl_chan = -1; - c->mux_rcb = NULL; - c->mux_ctx = NULL; - c->mux_pause = 0; - c->delayed = 1; /* prevent call to channel_post handler */ - TAILQ_INIT(&c->status_confirms); - debug("channel %d: new [%s]", found, remote_name); - return c; -} - -static int -channel_find_maxfd(void) -{ - u_int i; - int max = 0; - Channel *c; - - for (i = 0; i < channels_alloc; i++) { - c = channels[i]; - if (c != NULL) { - max = MAXIMUM(max, c->rfd); - max = MAXIMUM(max, c->wfd); - max = MAXIMUM(max, c->efd); - } - } - return max; -} - -int -channel_close_fd(int *fdp) -{ - int ret = 0, fd = *fdp; - - if (fd != -1) { - ret = close(fd); - *fdp = -1; - if (fd == channel_max_fd) - channel_max_fd = channel_find_maxfd(); - } - return ret; -} - -/* Close all channel fd/socket. */ -static void -channel_close_fds(Channel *c) -{ - channel_close_fd(&c->sock); - channel_close_fd(&c->rfd); - channel_close_fd(&c->wfd); - channel_close_fd(&c->efd); -} - -/* Free the channel and close its fd/socket. */ -void -channel_free(Channel *c) -{ - char *s; - u_int i, n; - Channel *other; - struct channel_confirm *cc; - - for (n = 0, i = 0; i < channels_alloc; i++) { - if ((other = channels[i]) != NULL) { - n++; - - /* detach from mux client and prepare for closing */ - if (c->type == SSH_CHANNEL_MUX_CLIENT && - other->type == SSH_CHANNEL_MUX_PROXY && - other->mux_ctx == c) { - other->mux_ctx = NULL; - other->type = SSH_CHANNEL_OPEN; - other->istate = CHAN_INPUT_CLOSED; - other->ostate = CHAN_OUTPUT_CLOSED; - } - } - } - debug("channel %d: free: %s, nchannels %u", c->self, - c->remote_name ? c->remote_name : "???", n); - - /* XXX more MUX cleanup: remove remote forwardings */ - if (c->type == SSH_CHANNEL_MUX_CLIENT) { - for (i = 0; i < (u_int)num_permitted_opens; i++) { - if (permitted_opens[i].downstream != c) - continue; - /* cancel on the server, since mux client is gone */ - debug("channel %d: cleanup remote forward for %s:%u", - c->self, - permitted_opens[i].listen_host, - permitted_opens[i].listen_port); - packet_start(SSH2_MSG_GLOBAL_REQUEST); - packet_put_cstring("cancel-tcpip-forward"); - packet_put_char(0); - packet_put_cstring(channel_rfwd_bind_host( - permitted_opens[i].listen_host)); - packet_put_int(permitted_opens[i].listen_port); - packet_send(); - /* unregister */ - permitted_opens[i].listen_port = 0; - permitted_opens[i].port_to_connect = 0; - free(permitted_opens[i].host_to_connect); - permitted_opens[i].host_to_connect = NULL; - free(permitted_opens[i].listen_host); - permitted_opens[i].listen_host = NULL; - permitted_opens[i].listen_path = NULL; - permitted_opens[i].downstream = NULL; - } - } - - s = channel_open_message(); - debug3("channel %d: status: %s", c->self, s); - free(s); - - if (c->sock != -1) - shutdown(c->sock, SHUT_RDWR); - channel_close_fds(c); - buffer_free(&c->input); - buffer_free(&c->output); - buffer_free(&c->extended); - free(c->remote_name); - c->remote_name = NULL; - free(c->path); - c->path = NULL; - free(c->listening_addr); - c->listening_addr = NULL; - while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) { - if (cc->abandon_cb != NULL) - cc->abandon_cb(c, cc->ctx); - TAILQ_REMOVE(&c->status_confirms, cc, entry); - explicit_bzero(cc, sizeof(*cc)); - free(cc); - } - if (c->filter_cleanup != NULL && c->filter_ctx != NULL) - c->filter_cleanup(c->self, c->filter_ctx); - channels[c->self] = NULL; - free(c); -} - -void -channel_free_all(void) -{ - u_int i; - - for (i = 0; i < channels_alloc; i++) - if (channels[i] != NULL) - channel_free(channels[i]); -} - -/* - * Closes the sockets/fds of all channels. This is used to close extra file - * descriptors after a fork. - */ -void -channel_close_all(void) -{ - u_int i; - - for (i = 0; i < channels_alloc; i++) - if (channels[i] != NULL) - channel_close_fds(channels[i]); -} - -/* - * Stop listening to channels. - */ -void -channel_stop_listening(void) -{ - u_int i; - Channel *c; - - for (i = 0; i < channels_alloc; i++) { - c = channels[i]; - if (c != NULL) { - switch (c->type) { - case SSH_CHANNEL_AUTH_SOCKET: - case SSH_CHANNEL_PORT_LISTENER: - case SSH_CHANNEL_RPORT_LISTENER: - case SSH_CHANNEL_X11_LISTENER: - case SSH_CHANNEL_UNIX_LISTENER: - case SSH_CHANNEL_RUNIX_LISTENER: - channel_close_fd(&c->sock); - channel_free(c); - break; - } - } - } -} - -/* - * Returns true if no channel has too much buffered data, and false if one or - * more channel is overfull. - */ -int -channel_not_very_much_buffered_data(void) -{ - u_int i; - Channel *c; - - for (i = 0; i < channels_alloc; i++) { - c = channels[i]; - if (c != NULL && c->type == SSH_CHANNEL_OPEN) { -#if 0 - if (!compat20 && - buffer_len(&c->input) > packet_get_maxsize()) { - debug2("channel %d: big input buffer %d", - c->self, buffer_len(&c->input)); - return 0; - } -#endif - if (buffer_len(&c->output) > packet_get_maxsize()) { - debug2("channel %d: big output buffer %u > %u", - c->self, buffer_len(&c->output), - packet_get_maxsize()); - return 0; - } - } - } - return 1; -} - -/* Returns true if any channel is still open. */ -int -channel_still_open(void) -{ - u_int i; - Channel *c; - - for (i = 0; i < channels_alloc; i++) { - c = channels[i]; - if (c == NULL) - continue; - switch (c->type) { - case SSH_CHANNEL_X11_LISTENER: - case SSH_CHANNEL_PORT_LISTENER: - case SSH_CHANNEL_RPORT_LISTENER: - case SSH_CHANNEL_MUX_LISTENER: - case SSH_CHANNEL_CLOSED: - case SSH_CHANNEL_AUTH_SOCKET: - case SSH_CHANNEL_DYNAMIC: - case SSH_CHANNEL_CONNECTING: - case SSH_CHANNEL_ZOMBIE: - case SSH_CHANNEL_ABANDONED: - case SSH_CHANNEL_UNIX_LISTENER: - case SSH_CHANNEL_RUNIX_LISTENER: - continue; - case SSH_CHANNEL_LARVAL: - if (!compat20) - fatal("cannot happen: SSH_CHANNEL_LARVAL"); - continue; - case SSH_CHANNEL_OPENING: - case SSH_CHANNEL_OPEN: - case SSH_CHANNEL_X11_OPEN: - case SSH_CHANNEL_MUX_CLIENT: - case SSH_CHANNEL_MUX_PROXY: - return 1; - case SSH_CHANNEL_INPUT_DRAINING: - case SSH_CHANNEL_OUTPUT_DRAINING: - if (!compat13) - fatal("cannot happen: OUT_DRAIN"); - return 1; - default: - fatal("channel_still_open: bad channel type %d", c->type); - /* NOTREACHED */ - } - } - return 0; -} - -/* Returns the id of an open channel suitable for keepaliving */ -int -channel_find_open(void) -{ - u_int i; - Channel *c; - - for (i = 0; i < channels_alloc; i++) { - c = channels[i]; - if (c == NULL || c->remote_id < 0) - continue; - switch (c->type) { - case SSH_CHANNEL_CLOSED: - case SSH_CHANNEL_DYNAMIC: - case SSH_CHANNEL_X11_LISTENER: - case SSH_CHANNEL_PORT_LISTENER: - case SSH_CHANNEL_RPORT_LISTENER: - case SSH_CHANNEL_MUX_LISTENER: - case SSH_CHANNEL_MUX_CLIENT: - case SSH_CHANNEL_MUX_PROXY: - case SSH_CHANNEL_OPENING: - case SSH_CHANNEL_CONNECTING: - case SSH_CHANNEL_ZOMBIE: - case SSH_CHANNEL_ABANDONED: - case SSH_CHANNEL_UNIX_LISTENER: - case SSH_CHANNEL_RUNIX_LISTENER: - continue; - case SSH_CHANNEL_LARVAL: - case SSH_CHANNEL_AUTH_SOCKET: - case SSH_CHANNEL_OPEN: - case SSH_CHANNEL_X11_OPEN: - return i; - case SSH_CHANNEL_INPUT_DRAINING: - case SSH_CHANNEL_OUTPUT_DRAINING: - if (!compat13) - fatal("cannot happen: OUT_DRAIN"); - return i; - default: - fatal("channel_find_open: bad channel type %d", c->type); - /* NOTREACHED */ - } - } - return -1; -} - -/* - * Returns a message describing the currently open forwarded connections, - * suitable for sending to the client. The message contains crlf pairs for - * newlines. - */ -char * -channel_open_message(void) -{ - Buffer buffer; - Channel *c; - char buf[1024], *cp; - u_int i; - - buffer_init(&buffer); - snprintf(buf, sizeof buf, "The following connections are open:\r\n"); - buffer_append(&buffer, buf, strlen(buf)); - for (i = 0; i < channels_alloc; i++) { - c = channels[i]; - if (c == NULL) - continue; - switch (c->type) { - case SSH_CHANNEL_X11_LISTENER: - case SSH_CHANNEL_PORT_LISTENER: - case SSH_CHANNEL_RPORT_LISTENER: - case SSH_CHANNEL_CLOSED: - case SSH_CHANNEL_AUTH_SOCKET: - case SSH_CHANNEL_ZOMBIE: - case SSH_CHANNEL_ABANDONED: - case SSH_CHANNEL_MUX_LISTENER: - case SSH_CHANNEL_UNIX_LISTENER: - case SSH_CHANNEL_RUNIX_LISTENER: - continue; - case SSH_CHANNEL_LARVAL: - case SSH_CHANNEL_OPENING: - case SSH_CHANNEL_CONNECTING: - case SSH_CHANNEL_DYNAMIC: - case SSH_CHANNEL_OPEN: - case SSH_CHANNEL_X11_OPEN: - case SSH_CHANNEL_INPUT_DRAINING: - case SSH_CHANNEL_OUTPUT_DRAINING: - case SSH_CHANNEL_MUX_PROXY: - case SSH_CHANNEL_MUX_CLIENT: - snprintf(buf, sizeof buf, - " #%d %.300s (t%d r%d i%u/%d o%u/%d fd %d/%d cc %d)\r\n", - c->self, c->remote_name, - c->type, c->remote_id, - c->istate, buffer_len(&c->input), - c->ostate, buffer_len(&c->output), - c->rfd, c->wfd, c->ctl_chan); - buffer_append(&buffer, buf, strlen(buf)); - continue; - default: - fatal("channel_open_message: bad channel type %d", c->type); - /* NOTREACHED */ - } - } - buffer_append(&buffer, "\0", 1); - cp = xstrdup((char *)buffer_ptr(&buffer)); - buffer_free(&buffer); - return cp; -} - -void -channel_send_open(int id) -{ - Channel *c = channel_lookup(id); - - if (c == NULL) { - logit("channel_send_open: %d: bad id", id); - return; - } - debug2("channel %d: send open", id); - packet_start(SSH2_MSG_CHANNEL_OPEN); - packet_put_cstring(c->ctype); - packet_put_int(c->self); - packet_put_int(c->local_window); - packet_put_int(c->local_maxpacket); - packet_send(); -} - -void -channel_request_start(int id, char *service, int wantconfirm) -{ - Channel *c = channel_lookup(id); - - if (c == NULL) { - logit("channel_request_start: %d: unknown channel id", id); - return; - } - debug2("channel %d: request %s confirm %d", id, service, wantconfirm); - packet_start(SSH2_MSG_CHANNEL_REQUEST); - packet_put_int(c->remote_id); - packet_put_cstring(service); - packet_put_char(wantconfirm); -} - -void -channel_register_status_confirm(int id, channel_confirm_cb *cb, - channel_confirm_abandon_cb *abandon_cb, void *ctx) -{ - struct channel_confirm *cc; - Channel *c; - - if ((c = channel_lookup(id)) == NULL) - fatal("channel_register_expect: %d: bad id", id); - - cc = xcalloc(1, sizeof(*cc)); - cc->cb = cb; - cc->abandon_cb = abandon_cb; - cc->ctx = ctx; - TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry); -} - -void -channel_register_open_confirm(int id, channel_open_fn *fn, void *ctx) -{ - Channel *c = channel_lookup(id); - - if (c == NULL) { - logit("channel_register_open_confirm: %d: bad id", id); - return; - } - c->open_confirm = fn; - c->open_confirm_ctx = ctx; -} - -void -channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) -{ - Channel *c = channel_by_id(id); - - if (c == NULL) { - logit("channel_register_cleanup: %d: bad id", id); - return; - } - c->detach_user = fn; - c->detach_close = do_close; -} - -void -channel_cancel_cleanup(int id) -{ - Channel *c = channel_by_id(id); - - if (c == NULL) { - logit("channel_cancel_cleanup: %d: bad id", id); - return; - } - c->detach_user = NULL; - c->detach_close = 0; -} - -void -channel_register_filter(int id, channel_infilter_fn *ifn, - channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx) -{ - Channel *c = channel_lookup(id); - - if (c == NULL) { - logit("channel_register_filter: %d: bad id", id); - return; - } - c->input_filter = ifn; - c->output_filter = ofn; - c->filter_ctx = ctx; - c->filter_cleanup = cfn; -} - -void -channel_set_fds(int id, int rfd, int wfd, int efd, - int extusage, int nonblock, int is_tty, u_int window_max) -{ - Channel *c = channel_lookup(id); - - if (c == NULL || c->type != SSH_CHANNEL_LARVAL) - fatal("channel_activate for non-larval channel %d.", id); - channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, is_tty); - c->type = SSH_CHANNEL_OPEN; - c->local_window = c->local_window_max = window_max; - packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); - packet_put_int(c->remote_id); - packet_put_int(c->local_window); - packet_send(); -} - -/* - * 'channel_pre*' are called just before select() to add any bits relevant to - * channels in the select bitmasks. - */ -/* - * 'channel_post*': perform any appropriate operations for channels which - * have events pending. - */ -typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset); -chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; -chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; - -/* ARGSUSED */ -static void -channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset) -{ - FD_SET(c->sock, readset); -} - -/* ARGSUSED */ -static void -channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset) -{ - debug3("channel %d: waiting for connection", c->self); - FD_SET(c->sock, writeset); -} - -static void -channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset) -{ - if (buffer_len(&c->input) < packet_get_maxsize()) - FD_SET(c->sock, readset); - if (buffer_len(&c->output) > 0) - FD_SET(c->sock, writeset); -} - -static void -channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset) -{ - u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); - - if (c->istate == CHAN_INPUT_OPEN && - limit > 0 && - buffer_len(&c->input) < limit && - buffer_check_alloc(&c->input, CHAN_RBUF)) - FD_SET(c->rfd, readset); - if (c->ostate == CHAN_OUTPUT_OPEN || - c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { - if (buffer_len(&c->output) > 0) { - FD_SET(c->wfd, writeset); - } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { - if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) - debug2("channel %d: obuf_empty delayed efd %d/(%d)", - c->self, c->efd, buffer_len(&c->extended)); - else - chan_obuf_empty(c); - } - } - /** XXX check close conditions, too */ - if (compat20 && c->efd != -1 && - !(c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED)) { - if (c->extended_usage == CHAN_EXTENDED_WRITE && - buffer_len(&c->extended) > 0) - FD_SET(c->efd, writeset); - else if (c->efd != -1 && !(c->flags & CHAN_EOF_SENT) && - (c->extended_usage == CHAN_EXTENDED_READ || - c->extended_usage == CHAN_EXTENDED_IGNORE) && - buffer_len(&c->extended) < c->remote_window) - FD_SET(c->efd, readset); - } - /* XXX: What about efd? races? */ -} - -/* ARGSUSED */ -static void -channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset) -{ - if (buffer_len(&c->input) == 0) { - packet_start(SSH_MSG_CHANNEL_CLOSE); - packet_put_int(c->remote_id); - packet_send(); - c->type = SSH_CHANNEL_CLOSED; - debug2("channel %d: closing after input drain.", c->self); - } -} - -/* ARGSUSED */ -static void -channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset) -{ - if (buffer_len(&c->output) == 0) - chan_mark_dead(c); - else - FD_SET(c->sock, writeset); -} - -/* - * This is a special state for X11 authentication spoofing. An opened X11 - * connection (when authentication spoofing is being done) remains in this - * state until the first packet has been completely read. The authentication - * data in that packet is then substituted by the real data if it matches the - * fake data, and the channel is put into normal mode. - * XXX All this happens at the client side. - * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok - */ -static int -x11_open_helper(Buffer *b) -{ - u_char *ucp; - u_int proto_len, data_len; - - /* Is this being called after the refusal deadline? */ - if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) { - verbose("Rejected X11 connection after ForwardX11Timeout " - "expired"); - return -1; - } - - /* Check if the fixed size part of the packet is in buffer. */ - if (buffer_len(b) < 12) - return 0; - - /* Parse the lengths of variable-length fields. */ - ucp = buffer_ptr(b); - if (ucp[0] == 0x42) { /* Byte order MSB first. */ - proto_len = 256 * ucp[6] + ucp[7]; - data_len = 256 * ucp[8] + ucp[9]; - } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ - proto_len = ucp[6] + 256 * ucp[7]; - data_len = ucp[8] + 256 * ucp[9]; - } else { - debug2("Initial X11 packet contains bad byte order byte: 0x%x", - ucp[0]); - return -1; - } - - /* Check if the whole packet is in buffer. */ - if (buffer_len(b) < - 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) - return 0; - - /* Check if authentication protocol matches. */ - if (proto_len != strlen(x11_saved_proto) || - memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { - debug2("X11 connection uses different authentication protocol."); - return -1; - } - /* Check if authentication data matches our fake data. */ - if (data_len != x11_fake_data_len || - timingsafe_bcmp(ucp + 12 + ((proto_len + 3) & ~3), - x11_fake_data, x11_fake_data_len) != 0) { - debug2("X11 auth data does not match fake data."); - return -1; - } - /* Check fake data length */ - if (x11_fake_data_len != x11_saved_data_len) { - error("X11 fake_data_len %d != saved_data_len %d", - x11_fake_data_len, x11_saved_data_len); - return -1; - } - /* - * Received authentication protocol and data match - * our fake data. Substitute the fake data with real - * data. - */ - memcpy(ucp + 12 + ((proto_len + 3) & ~3), - x11_saved_data, x11_saved_data_len); - return 1; -} - -static void -channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset) -{ - int ret = x11_open_helper(&c->output); - - if (ret == 1) { - /* Start normal processing for the channel. */ - c->type = SSH_CHANNEL_OPEN; - channel_pre_open_13(c, readset, writeset); - } else if (ret == -1) { - /* - * We have received an X11 connection that has bad - * authentication information. - */ - logit("X11 connection rejected because of wrong authentication."); - buffer_clear(&c->input); - buffer_clear(&c->output); - channel_close_fd(&c->sock); - c->sock = -1; - c->type = SSH_CHANNEL_CLOSED; - packet_start(SSH_MSG_CHANNEL_CLOSE); - packet_put_int(c->remote_id); - packet_send(); - } -} - -static void -channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset) -{ - int ret = x11_open_helper(&c->output); - - /* c->force_drain = 1; */ - - if (ret == 1) { - c->type = SSH_CHANNEL_OPEN; - channel_pre_open(c, readset, writeset); - } else if (ret == -1) { - logit("X11 connection rejected because of wrong authentication."); - debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); - chan_read_failed(c); - buffer_clear(&c->input); - chan_ibuf_empty(c); - buffer_clear(&c->output); - /* for proto v1, the peer will send an IEOF */ - if (compat20) - chan_write_failed(c); - else - c->type = SSH_CHANNEL_OPEN; - debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); - } -} - -static void -channel_pre_mux_client(Channel *c, fd_set *readset, fd_set *writeset) -{ - if (c->istate == CHAN_INPUT_OPEN && !c->mux_pause && - buffer_check_alloc(&c->input, CHAN_RBUF)) - FD_SET(c->rfd, readset); - if (c->istate == CHAN_INPUT_WAIT_DRAIN) { - /* clear buffer immediately (discard any partial packet) */ - buffer_clear(&c->input); - chan_ibuf_empty(c); - /* Start output drain. XXX just kill chan? */ - chan_rcvd_oclose(c); - } - if (c->ostate == CHAN_OUTPUT_OPEN || - c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { - if (buffer_len(&c->output) > 0) - FD_SET(c->wfd, writeset); - else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) - chan_obuf_empty(c); - } -} - -/* try to decode a socks4 header */ -/* ARGSUSED */ -static int -channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset) -{ - char *p, *host; - u_int len, have, i, found, need; - char username[256]; - struct { - u_int8_t version; - u_int8_t command; - u_int16_t dest_port; - struct in_addr dest_addr; - } s4_req, s4_rsp; - - debug2("channel %d: decode socks4", c->self); - - have = buffer_len(&c->input); - len = sizeof(s4_req); - if (have < len) - return 0; - p = (char *)buffer_ptr(&c->input); - - need = 1; - /* SOCKS4A uses an invalid IP address 0.0.0.x */ - if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) { - debug2("channel %d: socks4a request", c->self); - /* ... and needs an extra string (the hostname) */ - need = 2; - } - /* Check for terminating NUL on the string(s) */ - for (found = 0, i = len; i < have; i++) { - if (p[i] == '\0') { - found++; - if (found == need) - break; - } - if (i > 1024) { - /* the peer is probably sending garbage */ - debug("channel %d: decode socks4: too long", - c->self); - return -1; - } - } - if (found < need) - return 0; - buffer_get(&c->input, (char *)&s4_req.version, 1); - buffer_get(&c->input, (char *)&s4_req.command, 1); - buffer_get(&c->input, (char *)&s4_req.dest_port, 2); - buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); - have = buffer_len(&c->input); - p = (char *)buffer_ptr(&c->input); - if (memchr(p, '\0', have) == NULL) - fatal("channel %d: decode socks4: user not nul terminated", - c->self); - len = strlen(p); - debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); - len++; /* trailing '\0' */ - if (len > have) - fatal("channel %d: decode socks4: len %d > have %d", - c->self, len, have); - strlcpy(username, p, sizeof(username)); - buffer_consume(&c->input, len); - - free(c->path); - c->path = NULL; - if (need == 1) { /* SOCKS4: one string */ - host = inet_ntoa(s4_req.dest_addr); - c->path = xstrdup(host); - } else { /* SOCKS4A: two strings */ - have = buffer_len(&c->input); - p = (char *)buffer_ptr(&c->input); - len = strlen(p); - debug2("channel %d: decode socks4a: host %s/%d", - c->self, p, len); - len++; /* trailing '\0' */ - if (len > have) - fatal("channel %d: decode socks4a: len %d > have %d", - c->self, len, have); - if (len > NI_MAXHOST) { - error("channel %d: hostname \"%.100s\" too long", - c->self, p); - return -1; - } - c->path = xstrdup(p); - buffer_consume(&c->input, len); - } - c->host_port = ntohs(s4_req.dest_port); - - debug2("channel %d: dynamic request: socks4 host %s port %u command %u", - c->self, c->path, c->host_port, s4_req.command); - - if (s4_req.command != 1) { - debug("channel %d: cannot handle: %s cn %d", - c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command); - return -1; - } - s4_rsp.version = 0; /* vn: 0 for reply */ - s4_rsp.command = 90; /* cd: req granted */ - s4_rsp.dest_port = 0; /* ignored */ - s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ - buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp)); - return 1; -} - -/* try to decode a socks5 header */ -#define SSH_SOCKS5_AUTHDONE 0x1000 -#define SSH_SOCKS5_NOAUTH 0x00 -#define SSH_SOCKS5_IPV4 0x01 -#define SSH_SOCKS5_DOMAIN 0x03 -#define SSH_SOCKS5_IPV6 0x04 -#define SSH_SOCKS5_CONNECT 0x01 -#define SSH_SOCKS5_SUCCESS 0x00 - -/* ARGSUSED */ -static int -channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset) -{ - struct { - u_int8_t version; - u_int8_t command; - u_int8_t reserved; - u_int8_t atyp; - } s5_req, s5_rsp; - u_int16_t dest_port; - char dest_addr[255+1], ntop[INET6_ADDRSTRLEN]; - u_char *p; - u_int have, need, i, found, nmethods, addrlen, af; - - debug2("channel %d: decode socks5", c->self); - p = buffer_ptr(&c->input); - if (p[0] != 0x05) - return -1; - have = buffer_len(&c->input); - if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { - /* format: ver | nmethods | methods */ - if (have < 2) - return 0; - nmethods = p[1]; - if (have < nmethods + 2) - return 0; - /* look for method: "NO AUTHENTICATION REQUIRED" */ - for (found = 0, i = 2; i < nmethods + 2; i++) { - if (p[i] == SSH_SOCKS5_NOAUTH) { - found = 1; - break; - } - } - if (!found) { - debug("channel %d: method SSH_SOCKS5_NOAUTH not found", - c->self); - return -1; - } - buffer_consume(&c->input, nmethods + 2); - buffer_put_char(&c->output, 0x05); /* version */ - buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ - FD_SET(c->sock, writeset); - c->flags |= SSH_SOCKS5_AUTHDONE; - debug2("channel %d: socks5 auth done", c->self); - return 0; /* need more */ - } - debug2("channel %d: socks5 post auth", c->self); - if (have < sizeof(s5_req)+1) - return 0; /* need more */ - memcpy(&s5_req, p, sizeof(s5_req)); - if (s5_req.version != 0x05 || - s5_req.command != SSH_SOCKS5_CONNECT || - s5_req.reserved != 0x00) { - debug2("channel %d: only socks5 connect supported", c->self); - return -1; - } - switch (s5_req.atyp){ - case SSH_SOCKS5_IPV4: - addrlen = 4; - af = AF_INET; - break; - case SSH_SOCKS5_DOMAIN: - addrlen = p[sizeof(s5_req)]; - af = -1; - break; - case SSH_SOCKS5_IPV6: - addrlen = 16; - af = AF_INET6; - break; - default: - debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); - return -1; - } - need = sizeof(s5_req) + addrlen + 2; - if (s5_req.atyp == SSH_SOCKS5_DOMAIN) - need++; - if (have < need) - return 0; - buffer_consume(&c->input, sizeof(s5_req)); - if (s5_req.atyp == SSH_SOCKS5_DOMAIN) - buffer_consume(&c->input, 1); /* host string length */ - buffer_get(&c->input, &dest_addr, addrlen); - buffer_get(&c->input, (char *)&dest_port, 2); - dest_addr[addrlen] = '\0'; - free(c->path); - c->path = NULL; - if (s5_req.atyp == SSH_SOCKS5_DOMAIN) { - if (addrlen >= NI_MAXHOST) { - error("channel %d: dynamic request: socks5 hostname " - "\"%.100s\" too long", c->self, dest_addr); - return -1; - } - c->path = xstrdup(dest_addr); - } else { - if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL) - return -1; - c->path = xstrdup(ntop); - } - c->host_port = ntohs(dest_port); - - debug2("channel %d: dynamic request: socks5 host %s port %u command %u", - c->self, c->path, c->host_port, s5_req.command); - - s5_rsp.version = 0x05; - s5_rsp.command = SSH_SOCKS5_SUCCESS; - s5_rsp.reserved = 0; /* ignored */ - s5_rsp.atyp = SSH_SOCKS5_IPV4; - dest_port = 0; /* ignored */ - - buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp)); - buffer_put_int(&c->output, ntohl(INADDR_ANY)); /* bind address */ - buffer_append(&c->output, &dest_port, sizeof(dest_port)); - return 1; -} - -Channel * -channel_connect_stdio_fwd(const char *host_to_connect, u_short port_to_connect, - int in, int out) -{ - Channel *c; - - debug("channel_connect_stdio_fwd %s:%d", host_to_connect, - port_to_connect); - - c = channel_new("stdio-forward", SSH_CHANNEL_OPENING, in, out, - -1, CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, - 0, "stdio-forward", /*nonblock*/0); - - c->path = xstrdup(host_to_connect); - c->host_port = port_to_connect; - c->listening_port = 0; - c->force_drain = 1; - - channel_register_fds(c, in, out, -1, 0, 1, 0); - port_open_helper(c, "direct-tcpip"); - - return c; -} - -/* dynamic port forwarding */ -static void -channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset) -{ - u_char *p; - u_int have; - int ret; - - have = buffer_len(&c->input); - debug2("channel %d: pre_dynamic: have %d", c->self, have); - /* buffer_dump(&c->input); */ - /* check if the fixed size part of the packet is in buffer. */ - if (have < 3) { - /* need more */ - FD_SET(c->sock, readset); - return; - } - /* try to guess the protocol */ - p = buffer_ptr(&c->input); - switch (p[0]) { - case 0x04: - ret = channel_decode_socks4(c, readset, writeset); - break; - case 0x05: - ret = channel_decode_socks5(c, readset, writeset); - break; - default: - ret = -1; - break; - } - if (ret < 0) { - chan_mark_dead(c); - } else if (ret == 0) { - debug2("channel %d: pre_dynamic: need more", c->self); - /* need more */ - FD_SET(c->sock, readset); - } else { - /* switch to the next state */ - c->type = SSH_CHANNEL_OPENING; - port_open_helper(c, "direct-tcpip"); - } -} - -/* This is our fake X11 server socket. */ -/* ARGSUSED */ -static void -channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset) -{ - Channel *nc; - struct sockaddr_storage addr; - int newsock, oerrno; - socklen_t addrlen; - char buf[16384], *remote_ipaddr; - int remote_port; - - if (FD_ISSET(c->sock, readset)) { - debug("X11 connection requested."); - addrlen = sizeof(addr); - newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); - if (c->single_connection) { - oerrno = errno; - debug2("single_connection: closing X11 listener."); - channel_close_fd(&c->sock); - chan_mark_dead(c); - errno = oerrno; - } - if (newsock < 0) { - if (errno != EINTR && errno != EWOULDBLOCK && - errno != ECONNABORTED) - error("accept: %.100s", strerror(errno)); - if (errno == EMFILE || errno == ENFILE) - c->notbefore = monotime() + 1; - return; - } - set_nodelay(newsock); - remote_ipaddr = get_peer_ipaddr(newsock); - remote_port = get_peer_port(newsock); - snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", - remote_ipaddr, remote_port); - - nc = channel_new("accepted x11 socket", - SSH_CHANNEL_OPENING, newsock, newsock, -1, - c->local_window_max, c->local_maxpacket, 0, buf, 1); - if (compat20) { - packet_start(SSH2_MSG_CHANNEL_OPEN); - packet_put_cstring("x11"); - packet_put_int(nc->self); - packet_put_int(nc->local_window_max); - packet_put_int(nc->local_maxpacket); - /* originator ipaddr and port */ - packet_put_cstring(remote_ipaddr); - if (datafellows & SSH_BUG_X11FWD) { - debug2("ssh2 x11 bug compat mode"); - } else { - packet_put_int(remote_port); - } - packet_send(); - } else { - packet_start(SSH_SMSG_X11_OPEN); - packet_put_int(nc->self); - if (packet_get_protocol_flags() & - SSH_PROTOFLAG_HOST_IN_FWD_OPEN) - packet_put_cstring(buf); - packet_send(); - } - free(remote_ipaddr); - } -} - -static void -port_open_helper(Channel *c, char *rtype) -{ - char buf[1024]; - char *local_ipaddr = get_local_ipaddr(c->sock); - int local_port = c->sock == -1 ? 65536 : get_local_port(c->sock); - char *remote_ipaddr = get_peer_ipaddr(c->sock); - int remote_port = get_peer_port(c->sock); - - if (remote_port == -1) { - /* Fake addr/port to appease peers that validate it (Tectia) */ - free(remote_ipaddr); - remote_ipaddr = xstrdup("127.0.0.1"); - remote_port = 65535; - } - - snprintf(buf, sizeof buf, - "%s: listening port %d for %.100s port %d, " - "connect from %.200s port %d to %.100s port %d", - rtype, c->listening_port, c->path, c->host_port, - remote_ipaddr, remote_port, local_ipaddr, local_port); - - free(c->remote_name); - c->remote_name = xstrdup(buf); - - if (compat20) { - packet_start(SSH2_MSG_CHANNEL_OPEN); - packet_put_cstring(rtype); - packet_put_int(c->self); - packet_put_int(c->local_window_max); - packet_put_int(c->local_maxpacket); - if (strcmp(rtype, "direct-tcpip") == 0) { - /* target host, port */ - packet_put_cstring(c->path); - packet_put_int(c->host_port); - } else if (strcmp(rtype, "direct-streamlocal@openssh.com") == 0) { - /* target path */ - packet_put_cstring(c->path); - } else if (strcmp(rtype, "forwarded-streamlocal@openssh.com") == 0) { - /* listen path */ - packet_put_cstring(c->path); - } else { - /* listen address, port */ - packet_put_cstring(c->path); - packet_put_int(local_port); - } - if (strcmp(rtype, "forwarded-streamlocal@openssh.com") == 0) { - /* reserved for future owner/mode info */ - packet_put_cstring(""); - } else { - /* originator host and port */ - packet_put_cstring(remote_ipaddr); - packet_put_int((u_int)remote_port); - } - packet_send(); - } else { - packet_start(SSH_MSG_PORT_OPEN); - packet_put_int(c->self); - packet_put_cstring(c->path); - packet_put_int(c->host_port); - if (packet_get_protocol_flags() & - SSH_PROTOFLAG_HOST_IN_FWD_OPEN) - packet_put_cstring(c->remote_name); - packet_send(); - } - free(remote_ipaddr); - free(local_ipaddr); -} - -static void -channel_set_reuseaddr(int fd) -{ - int on = 1; - - /* - * Set socket options. - * Allow local port reuse in TIME_WAIT. - */ - if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) - error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); -} - -void -channel_set_x11_refuse_time(u_int refuse_time) -{ - x11_refuse_time = refuse_time; -} - -/* - * This socket is listening for connections to a forwarded TCP/IP port. - */ -/* ARGSUSED */ -static void -channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset) -{ - Channel *nc; - struct sockaddr_storage addr; - int newsock, nextstate; - socklen_t addrlen; - char *rtype; - - if (FD_ISSET(c->sock, readset)) { - debug("Connection to port %d forwarding " - "to %.100s port %d requested.", - c->listening_port, c->path, c->host_port); - - if (c->type == SSH_CHANNEL_RPORT_LISTENER) { - nextstate = SSH_CHANNEL_OPENING; - rtype = "forwarded-tcpip"; - } else if (c->type == SSH_CHANNEL_RUNIX_LISTENER) { - nextstate = SSH_CHANNEL_OPENING; - rtype = "forwarded-streamlocal@openssh.com"; - } else if (c->host_port == PORT_STREAMLOCAL) { - nextstate = SSH_CHANNEL_OPENING; - rtype = "direct-streamlocal@openssh.com"; - } else if (c->host_port == 0) { - nextstate = SSH_CHANNEL_DYNAMIC; - rtype = "dynamic-tcpip"; - } else { - nextstate = SSH_CHANNEL_OPENING; - rtype = "direct-tcpip"; - } - - addrlen = sizeof(addr); - newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); - if (newsock < 0) { - if (errno != EINTR && errno != EWOULDBLOCK && - errno != ECONNABORTED) - error("accept: %.100s", strerror(errno)); - if (errno == EMFILE || errno == ENFILE) - c->notbefore = monotime() + 1; - return; - } - if (c->host_port != PORT_STREAMLOCAL) - set_nodelay(newsock); - nc = channel_new(rtype, nextstate, newsock, newsock, -1, - c->local_window_max, c->local_maxpacket, 0, rtype, 1); - nc->listening_port = c->listening_port; - nc->host_port = c->host_port; - if (c->path != NULL) - nc->path = xstrdup(c->path); - - if (nextstate != SSH_CHANNEL_DYNAMIC) - port_open_helper(nc, rtype); - } -} - -/* - * This is the authentication agent socket listening for connections from - * clients. - */ -/* ARGSUSED */ -static void -channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset) -{ - Channel *nc; - int newsock; - struct sockaddr_storage addr; - socklen_t addrlen; - - if (FD_ISSET(c->sock, readset)) { - addrlen = sizeof(addr); - newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen); - if (newsock < 0) { - error("accept from auth socket: %.100s", - strerror(errno)); - if (errno == EMFILE || errno == ENFILE) - c->notbefore = monotime() + 1; - return; - } - nc = channel_new("accepted auth socket", - SSH_CHANNEL_OPENING, newsock, newsock, -1, - c->local_window_max, c->local_maxpacket, - 0, "accepted auth socket", 1); - if (compat20) { - packet_start(SSH2_MSG_CHANNEL_OPEN); - packet_put_cstring("auth-agent@openssh.com"); - packet_put_int(nc->self); - packet_put_int(c->local_window_max); - packet_put_int(c->local_maxpacket); - } else { - packet_start(SSH_SMSG_AGENT_OPEN); - packet_put_int(nc->self); - } - packet_send(); - } -} - -/* ARGSUSED */ -static void -channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset) -{ - int err = 0, sock; - socklen_t sz = sizeof(err); - - if (FD_ISSET(c->sock, writeset)) { - if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { - err = errno; - error("getsockopt SO_ERROR failed"); - } - if (err == 0) { - debug("channel %d: connected to %s port %d", - c->self, c->connect_ctx.host, c->connect_ctx.port); - channel_connect_ctx_free(&c->connect_ctx); - c->type = SSH_CHANNEL_OPEN; - if (compat20) { - packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); - packet_put_int(c->remote_id); - packet_put_int(c->self); - packet_put_int(c->local_window); - packet_put_int(c->local_maxpacket); - } else { - packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); - packet_put_int(c->remote_id); - packet_put_int(c->self); - } - } else { - debug("channel %d: connection failed: %s", - c->self, strerror(err)); - /* Try next address, if any */ - if ((sock = connect_next(&c->connect_ctx)) > 0) { - close(c->sock); - c->sock = c->rfd = c->wfd = sock; - channel_max_fd = channel_find_maxfd(); - return; - } - /* Exhausted all addresses */ - error("connect_to %.100s port %d: failed.", - c->connect_ctx.host, c->connect_ctx.port); - channel_connect_ctx_free(&c->connect_ctx); - if (compat20) { - packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); - packet_put_int(c->remote_id); - packet_put_int(SSH2_OPEN_CONNECT_FAILED); - if (!(datafellows & SSH_BUG_OPENFAILURE)) { - packet_put_cstring(strerror(err)); - packet_put_cstring(""); - } - } else { - packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); - packet_put_int(c->remote_id); - } - chan_mark_dead(c); - } - packet_send(); - } -} - -/* ARGSUSED */ -static int -channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset) -{ - char buf[CHAN_RBUF]; - int len, force; - - force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED; - if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) { - errno = 0; - len = read(c->rfd, buf, sizeof(buf)); - if (len < 0 && (errno == EINTR || - ((errno == EAGAIN || errno == EWOULDBLOCK) && !force))) - return 1; -#ifndef PTY_ZEROREAD - if (len <= 0) { -#else - if ((!c->isatty && len <= 0) || - (c->isatty && (len < 0 || (len == 0 && errno != 0)))) { -#endif - debug2("channel %d: read<=0 rfd %d len %d", - c->self, c->rfd, len); - if (c->type != SSH_CHANNEL_OPEN) { - debug2("channel %d: not open", c->self); - chan_mark_dead(c); - return -1; - } else if (compat13) { - buffer_clear(&c->output); - c->type = SSH_CHANNEL_INPUT_DRAINING; - debug2("channel %d: input draining.", c->self); - } else { - chan_read_failed(c); - } - return -1; - } - if (c->input_filter != NULL) { - if (c->input_filter(c, buf, len) == -1) { - debug2("channel %d: filter stops", c->self); - chan_read_failed(c); - } - } else if (c->datagram) { - buffer_put_string(&c->input, buf, len); - } else { - buffer_append(&c->input, buf, len); - } - } - return 1; -} - -/* ARGSUSED */ -static int -channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset) -{ - struct termios tio; - u_char *data = NULL, *buf; - u_int dlen, olen = 0; - int len; - - /* Send buffered output data to the socket. */ - if (c->wfd != -1 && - FD_ISSET(c->wfd, writeset) && - buffer_len(&c->output) > 0) { - olen = buffer_len(&c->output); - if (c->output_filter != NULL) { - if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { - debug2("channel %d: filter stops", c->self); - if (c->type != SSH_CHANNEL_OPEN) - chan_mark_dead(c); - else - chan_write_failed(c); - return -1; - } - } else if (c->datagram) { - buf = data = buffer_get_string(&c->output, &dlen); - } else { - buf = data = buffer_ptr(&c->output); - dlen = buffer_len(&c->output); - } - - if (c->datagram) { - /* ignore truncated writes, datagrams might get lost */ - len = write(c->wfd, buf, dlen); - free(data); - if (len < 0 && (errno == EINTR || errno == EAGAIN || - errno == EWOULDBLOCK)) - return 1; - if (len <= 0) { - if (c->type != SSH_CHANNEL_OPEN) - chan_mark_dead(c); - else - chan_write_failed(c); - return -1; - } - goto out; - } -#ifdef _AIX - /* XXX: Later AIX versions can't push as much data to tty */ - if (compat20 && c->wfd_isatty) - dlen = MIN(dlen, 8*1024); -#endif - - len = write(c->wfd, buf, dlen); - if (len < 0 && - (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) - return 1; - if (len <= 0) { - if (c->type != SSH_CHANNEL_OPEN) { - debug2("channel %d: not open", c->self); - chan_mark_dead(c); - return -1; - } else if (compat13) { - buffer_clear(&c->output); - debug2("channel %d: input draining.", c->self); - c->type = SSH_CHANNEL_INPUT_DRAINING; - } else { - chan_write_failed(c); - } - return -1; - } -#ifndef BROKEN_TCGETATTR_ICANON - if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { - if (tcgetattr(c->wfd, &tio) == 0 && - !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { - /* - * Simulate echo to reduce the impact of - * traffic analysis. We need to match the - * size of a SSH2_MSG_CHANNEL_DATA message - * (4 byte channel id + buf) - */ - packet_send_ignore(4 + len); - packet_send(); - } - } -#endif - buffer_consume(&c->output, len); - } - out: - if (compat20 && olen > 0) - c->local_consumed += olen - buffer_len(&c->output); - return 1; -} - -static int -channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset) -{ - char buf[CHAN_RBUF]; - int len; - -/** XXX handle drain efd, too */ - if (c->efd != -1) { - if (c->extended_usage == CHAN_EXTENDED_WRITE && - FD_ISSET(c->efd, writeset) && - buffer_len(&c->extended) > 0) { - len = write(c->efd, buffer_ptr(&c->extended), - buffer_len(&c->extended)); - debug2("channel %d: written %d to efd %d", - c->self, len, c->efd); - if (len < 0 && (errno == EINTR || errno == EAGAIN || - errno == EWOULDBLOCK)) - return 1; - if (len <= 0) { - debug2("channel %d: closing write-efd %d", - c->self, c->efd); - channel_close_fd(&c->efd); - } else { - buffer_consume(&c->extended, len); - c->local_consumed += len; - } - } else if (c->efd != -1 && - (c->extended_usage == CHAN_EXTENDED_READ || - c->extended_usage == CHAN_EXTENDED_IGNORE) && - (c->detach_close || FD_ISSET(c->efd, readset))) { - len = read(c->efd, buf, sizeof(buf)); - debug2("channel %d: read %d from efd %d", - c->self, len, c->efd); - if (len < 0 && (errno == EINTR || ((errno == EAGAIN || - errno == EWOULDBLOCK) && !c->detach_close))) - return 1; - if (len <= 0) { - debug2("channel %d: closing read-efd %d", - c->self, c->efd); - channel_close_fd(&c->efd); - } else { - if (c->extended_usage == CHAN_EXTENDED_IGNORE) { - debug3("channel %d: discard efd", - c->self); - } else - buffer_append(&c->extended, buf, len); - } - } - } - return 1; -} - -static int -channel_check_window(Channel *c) -{ - if (c->type == SSH_CHANNEL_OPEN && - !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && - ((c->local_window_max - c->local_window > - c->local_maxpacket*3) || - c->local_window < c->local_window_max/2) && - c->local_consumed > 0) { - packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); - packet_put_int(c->remote_id); - packet_put_int(c->local_consumed); - packet_send(); - debug2("channel %d: window %d sent adjust %d", - c->self, c->local_window, - c->local_consumed); - c->local_window += c->local_consumed; - c->local_consumed = 0; - } - return 1; -} - -static void -channel_post_open(Channel *c, fd_set *readset, fd_set *writeset) -{ - channel_handle_rfd(c, readset, writeset); - channel_handle_wfd(c, readset, writeset); - if (!compat20) - return; - channel_handle_efd(c, readset, writeset); - channel_check_window(c); -} - -static u_int -read_mux(Channel *c, u_int need) -{ - char buf[CHAN_RBUF]; - int len; - u_int rlen; - - if (buffer_len(&c->input) < need) { - rlen = need - buffer_len(&c->input); - len = read(c->rfd, buf, MINIMUM(rlen, CHAN_RBUF)); - if (len < 0 && (errno == EINTR || errno == EAGAIN)) - return buffer_len(&c->input); - if (len <= 0) { - debug2("channel %d: ctl read<=0 rfd %d len %d", - c->self, c->rfd, len); - chan_read_failed(c); - return 0; - } else - buffer_append(&c->input, buf, len); - } - return buffer_len(&c->input); -} - -static void -channel_post_mux_client(Channel *c, fd_set *readset, fd_set *writeset) -{ - u_int need; - ssize_t len; - - if (!compat20) - fatal("%s: entered with !compat20", __func__); - - if (c->rfd != -1 && !c->mux_pause && FD_ISSET(c->rfd, readset) && - (c->istate == CHAN_INPUT_OPEN || - c->istate == CHAN_INPUT_WAIT_DRAIN)) { - /* - * Don't not read past the precise end of packets to - * avoid disrupting fd passing. - */ - if (read_mux(c, 4) < 4) /* read header */ - return; - need = get_u32(buffer_ptr(&c->input)); -#define CHANNEL_MUX_MAX_PACKET (256 * 1024) - if (need > CHANNEL_MUX_MAX_PACKET) { - debug2("channel %d: packet too big %u > %u", - c->self, CHANNEL_MUX_MAX_PACKET, need); - chan_rcvd_oclose(c); - return; - } - if (read_mux(c, need + 4) < need + 4) /* read body */ - return; - if (c->mux_rcb(c) != 0) { - debug("channel %d: mux_rcb failed", c->self); - chan_mark_dead(c); - return; - } - } - - if (c->wfd != -1 && FD_ISSET(c->wfd, writeset) && - buffer_len(&c->output) > 0) { - len = write(c->wfd, buffer_ptr(&c->output), - buffer_len(&c->output)); - if (len < 0 && (errno == EINTR || errno == EAGAIN)) - return; - if (len <= 0) { - chan_mark_dead(c); - return; - } - buffer_consume(&c->output, len); - } -} - -static void -channel_post_mux_listener(Channel *c, fd_set *readset, fd_set *writeset) -{ - Channel *nc; - struct sockaddr_storage addr; - socklen_t addrlen; - int newsock; - uid_t euid; - gid_t egid; - - if (!FD_ISSET(c->sock, readset)) - return; - - debug("multiplexing control connection"); - - /* - * Accept connection on control socket - */ - memset(&addr, 0, sizeof(addr)); - addrlen = sizeof(addr); - if ((newsock = accept(c->sock, (struct sockaddr*)&addr, - &addrlen)) == -1) { - error("%s accept: %s", __func__, strerror(errno)); - if (errno == EMFILE || errno == ENFILE) - c->notbefore = monotime() + 1; - return; - } - - if (getpeereid(newsock, &euid, &egid) < 0) { - error("%s getpeereid failed: %s", __func__, - strerror(errno)); - close(newsock); - return; - } - if ((euid != 0) && (getuid() != euid)) { - error("multiplex uid mismatch: peer euid %u != uid %u", - (u_int)euid, (u_int)getuid()); - close(newsock); - return; - } - nc = channel_new("multiplex client", SSH_CHANNEL_MUX_CLIENT, - newsock, newsock, -1, c->local_window_max, - c->local_maxpacket, 0, "mux-control", 1); - nc->mux_rcb = c->mux_rcb; - debug3("%s: new mux channel %d fd %d", __func__, - nc->self, nc->sock); - /* establish state */ - nc->mux_rcb(nc); - /* mux state transitions must not elicit protocol messages */ - nc->flags |= CHAN_LOCAL; -} - -/* ARGSUSED */ -static void -channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset) -{ - int len; - - /* Send buffered output data to the socket. */ - if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { - len = write(c->sock, buffer_ptr(&c->output), - buffer_len(&c->output)); - if (len <= 0) - buffer_clear(&c->output); - else - buffer_consume(&c->output, len); - } -} - -static void -channel_handler_init_20(void) -{ - channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; - channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; - channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; - channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; - channel_pre[SSH_CHANNEL_UNIX_LISTENER] = &channel_pre_listener; - channel_pre[SSH_CHANNEL_RUNIX_LISTENER] = &channel_pre_listener; - channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; - channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; - channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; - channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; - channel_pre[SSH_CHANNEL_MUX_LISTENER] = &channel_pre_listener; - channel_pre[SSH_CHANNEL_MUX_CLIENT] = &channel_pre_mux_client; - - channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; - channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; - channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; - channel_post[SSH_CHANNEL_UNIX_LISTENER] = &channel_post_port_listener; - channel_post[SSH_CHANNEL_RUNIX_LISTENER] = &channel_post_port_listener; - channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; - channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; - channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; - channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; - channel_post[SSH_CHANNEL_MUX_LISTENER] = &channel_post_mux_listener; - channel_post[SSH_CHANNEL_MUX_CLIENT] = &channel_post_mux_client; -} - -static void -channel_handler_init_13(void) -{ - channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; - channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; - channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; - channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; - channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; - channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; - channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; - channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; - channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; - - channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; - channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; - channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; - channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; - channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; - channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; - channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; -} - -static void -channel_handler_init_15(void) -{ - channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; - channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; - channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; - channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; - channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; - channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; - channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; - - channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; - channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; - channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; - channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; - channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; - channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; -} - -static void -channel_handler_init(void) -{ - int i; - - for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { - channel_pre[i] = NULL; - channel_post[i] = NULL; - } - if (compat20) - channel_handler_init_20(); - else if (compat13) - channel_handler_init_13(); - else - channel_handler_init_15(); -} - -/* gc dead channels */ -static void -channel_garbage_collect(Channel *c) -{ - if (c == NULL) - return; - if (c->detach_user != NULL) { - if (!chan_is_dead(c, c->detach_close)) - return; - debug2("channel %d: gc: notify user", c->self); - c->detach_user(c->self, NULL); - /* if we still have a callback */ - if (c->detach_user != NULL) - return; - debug2("channel %d: gc: user detached", c->self); - } - if (!chan_is_dead(c, 1)) - return; - debug2("channel %d: garbage collecting", c->self); - channel_free(c); -} - -static void -channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset, - time_t *unpause_secs) -{ - static int did_init = 0; - u_int i, oalloc; - Channel *c; - time_t now; - - if (!did_init) { - channel_handler_init(); - did_init = 1; - } - now = monotime(); - if (unpause_secs != NULL) - *unpause_secs = 0; - for (i = 0, oalloc = channels_alloc; i < oalloc; i++) { - c = channels[i]; - if (c == NULL) - continue; - if (c->delayed) { - if (ftab == channel_pre) - c->delayed = 0; - else - continue; - } - if (ftab[c->type] != NULL) { - /* - * Run handlers that are not paused. - */ - if (c->notbefore <= now) - (*ftab[c->type])(c, readset, writeset); - else if (unpause_secs != NULL) { - /* - * Collect the time that the earliest - * channel comes off pause. - */ - debug3("%s: chan %d: skip for %d more seconds", - __func__, c->self, - (int)(c->notbefore - now)); - if (*unpause_secs == 0 || - (c->notbefore - now) < *unpause_secs) - *unpause_secs = c->notbefore - now; - } - } - channel_garbage_collect(c); - } - if (unpause_secs != NULL && *unpause_secs != 0) - debug3("%s: first channel unpauses in %d seconds", - __func__, (int)*unpause_secs); -} - -/* - * Allocate/update select bitmasks and add any bits relevant to channels in - * select bitmasks. - */ -void -channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, - u_int *nallocp, time_t *minwait_secs, int rekeying) -{ - u_int n, sz, nfdset; - - n = MAXIMUM(*maxfdp, channel_max_fd); - - nfdset = howmany(n+1, NFDBITS); - /* Explicitly test here, because xrealloc isn't always called */ - if (nfdset && SIZE_MAX / nfdset < sizeof(fd_mask)) - fatal("channel_prepare_select: max_fd (%d) is too large", n); - sz = nfdset * sizeof(fd_mask); - - /* perhaps check sz < nalloc/2 and shrink? */ - if (*readsetp == NULL || sz > *nallocp) { - *readsetp = xreallocarray(*readsetp, nfdset, sizeof(fd_mask)); - *writesetp = xreallocarray(*writesetp, nfdset, sizeof(fd_mask)); - *nallocp = sz; - } - *maxfdp = n; - memset(*readsetp, 0, sz); - memset(*writesetp, 0, sz); - - if (!rekeying) - channel_handler(channel_pre, *readsetp, *writesetp, - minwait_secs); -} - -/* - * After select, perform any appropriate operations for channels which have - * events pending. - */ -void -channel_after_select(fd_set *readset, fd_set *writeset) -{ - channel_handler(channel_post, readset, writeset, NULL); -} - - -/* If there is data to send to the connection, enqueue some of it now. */ -void -channel_output_poll(void) -{ - Channel *c; - u_int i, len; - - for (i = 0; i < channels_alloc; i++) { - c = channels[i]; - if (c == NULL) - continue; - - /* - * We are only interested in channels that can have buffered - * incoming data. - */ - if (compat13) { - if (c->type != SSH_CHANNEL_OPEN && - c->type != SSH_CHANNEL_INPUT_DRAINING) - continue; - } else { - if (c->type != SSH_CHANNEL_OPEN) - continue; - } - if (compat20 && - (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { - /* XXX is this true? */ - debug3("channel %d: will not send data after close", c->self); - continue; - } - - /* Get the amount of buffered data for this channel. */ - if ((c->istate == CHAN_INPUT_OPEN || - c->istate == CHAN_INPUT_WAIT_DRAIN) && - (len = buffer_len(&c->input)) > 0) { - if (c->datagram) { - if (len > 0) { - u_char *data; - u_int dlen; - - data = buffer_get_string(&c->input, - &dlen); - if (dlen > c->remote_window || - dlen > c->remote_maxpacket) { - debug("channel %d: datagram " - "too big for channel", - c->self); - free(data); - continue; - } - packet_start(SSH2_MSG_CHANNEL_DATA); - packet_put_int(c->remote_id); - packet_put_string(data, dlen); - packet_send(); - c->remote_window -= dlen; - free(data); - } - continue; - } - /* - * Send some data for the other side over the secure - * connection. - */ - if (compat20) { - if (len > c->remote_window) - len = c->remote_window; - if (len > c->remote_maxpacket) - len = c->remote_maxpacket; - } else { - if (packet_is_interactive()) { - if (len > 1024) - len = 512; - } else { - /* Keep the packets at reasonable size. */ - if (len > packet_get_maxsize()/2) - len = packet_get_maxsize()/2; - } - } - if (len > 0) { - packet_start(compat20 ? - SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); - packet_put_int(c->remote_id); - packet_put_string(buffer_ptr(&c->input), len); - packet_send(); - buffer_consume(&c->input, len); - c->remote_window -= len; - } - } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { - if (compat13) - fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); - /* - * input-buffer is empty and read-socket shutdown: - * tell peer, that we will not send more data: send IEOF. - * hack for extended data: delay EOF if EFD still in use. - */ - if (CHANNEL_EFD_INPUT_ACTIVE(c)) - debug2("channel %d: ibuf_empty delayed efd %d/(%d)", - c->self, c->efd, buffer_len(&c->extended)); - else - chan_ibuf_empty(c); - } - /* Send extended data, i.e. stderr */ - if (compat20 && - !(c->flags & CHAN_EOF_SENT) && - c->remote_window > 0 && - (len = buffer_len(&c->extended)) > 0 && - c->extended_usage == CHAN_EXTENDED_READ) { - debug2("channel %d: rwin %u elen %u euse %d", - c->self, c->remote_window, buffer_len(&c->extended), - c->extended_usage); - if (len > c->remote_window) - len = c->remote_window; - if (len > c->remote_maxpacket) - len = c->remote_maxpacket; - packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); - packet_put_int(c->remote_id); - packet_put_int(SSH2_EXTENDED_DATA_STDERR); - packet_put_string(buffer_ptr(&c->extended), len); - packet_send(); - buffer_consume(&c->extended, len); - c->remote_window -= len; - debug2("channel %d: sent ext data %d", c->self, len); - } - } -} - -/* -- mux proxy support */ - -/* - * When multiplexing channel messages for mux clients we have to deal - * with downstream messages from the mux client and upstream messages - * from the ssh server: - * 1) Handling downstream messages is straightforward and happens - * in channel_proxy_downstream(): - * - We forward all messages (mostly) unmodified to the server. - * - However, in order to route messages from upstream to the correct - * downstream client, we have to replace the channel IDs used by the - * mux clients with a unique channel ID because the mux clients might - * use conflicting channel IDs. - * - so we inspect and change both SSH2_MSG_CHANNEL_OPEN and - * SSH2_MSG_CHANNEL_OPEN_CONFIRMATION messages, create a local - * SSH_CHANNEL_MUX_PROXY channel and replace the mux clients ID - * with the newly allocated channel ID. - * 2) Upstream messages are received by matching SSH_CHANNEL_MUX_PROXY - * channels and procesed by channel_proxy_upstream(). The local channel ID - * is then translated back to the original mux client ID. - * 3) In both cases we need to keep track of matching SSH2_MSG_CHANNEL_CLOSE - * messages so we can clean up SSH_CHANNEL_MUX_PROXY channels. - * 4) The SSH_CHANNEL_MUX_PROXY channels also need to closed when the - * downstream mux client are removed. - * 5) Handling SSH2_MSG_CHANNEL_OPEN messages from the upstream server - * requires more work, because they are not addressed to a specific - * channel. E.g. client_request_forwarded_tcpip() needs to figure - * out whether the request is addressed to the local client or a - * specific downstream client based on the listen-address/port. - * 6) Agent and X11-Forwarding have a similar problem and are currenly - * not supported as the matching session/channel cannot be identified - * easily. - */ - -/* - * receive packets from downstream mux clients: - * channel callback fired on read from mux client, creates - * SSH_CHANNEL_MUX_PROXY channels and translates channel IDs - * on channel creation. - */ -int -channel_proxy_downstream(Channel *downstream) -{ - Channel *c = NULL; - struct ssh *ssh = active_state; - struct sshbuf *original = NULL, *modified = NULL; - const u_char *cp; - char *ctype = NULL, *listen_host = NULL; - u_char type; - size_t have; - int ret = -1, r, idx; - u_int id, remote_id, listen_port; - - /* sshbuf_dump(&downstream->input, stderr); */ - if ((r = sshbuf_get_string_direct(&downstream->input, &cp, &have)) - != 0) { - error("%s: malformed message: %s", __func__, ssh_err(r)); - return -1; - } - if (have < 2) { - error("%s: short message", __func__); - return -1; - } - type = cp[1]; - /* skip padlen + type */ - cp += 2; - have -= 2; - if (ssh_packet_log_type(type)) - debug3("%s: channel %u: down->up: type %u", __func__, - downstream->self, type); - - switch (type) { - case SSH2_MSG_CHANNEL_OPEN: - if ((original = sshbuf_from(cp, have)) == NULL || - (modified = sshbuf_new()) == NULL) { - error("%s: alloc", __func__); - goto out; - } - if ((r = sshbuf_get_cstring(original, &ctype, NULL)) != 0 || - (r = sshbuf_get_u32(original, &id)) != 0) { - error("%s: parse error %s", __func__, ssh_err(r)); - goto out; - } - c = channel_new("mux proxy", SSH_CHANNEL_MUX_PROXY, - -1, -1, -1, 0, 0, 0, ctype, 1); - c->mux_ctx = downstream; /* point to mux client */ - c->mux_downstream_id = id; /* original downstream id */ - if ((r = sshbuf_put_cstring(modified, ctype)) != 0 || - (r = sshbuf_put_u32(modified, c->self)) != 0 || - (r = sshbuf_putb(modified, original)) != 0) { - error("%s: compose error %s", __func__, ssh_err(r)); - channel_free(c); - goto out; - } - break; - case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION: - /* - * Almost the same as SSH2_MSG_CHANNEL_OPEN, except then we - * need to parse 'remote_id' instead of 'ctype'. - */ - if ((original = sshbuf_from(cp, have)) == NULL || - (modified = sshbuf_new()) == NULL) { - error("%s: alloc", __func__); - goto out; - } - if ((r = sshbuf_get_u32(original, &remote_id)) != 0 || - (r = sshbuf_get_u32(original, &id)) != 0) { - error("%s: parse error %s", __func__, ssh_err(r)); - goto out; - } - c = channel_new("mux proxy", SSH_CHANNEL_MUX_PROXY, - -1, -1, -1, 0, 0, 0, "mux-down-connect", 1); - c->mux_ctx = downstream; /* point to mux client */ - c->mux_downstream_id = id; - c->remote_id = remote_id; - if ((r = sshbuf_put_u32(modified, remote_id)) != 0 || - (r = sshbuf_put_u32(modified, c->self)) != 0 || - (r = sshbuf_putb(modified, original)) != 0) { - error("%s: compose error %s", __func__, ssh_err(r)); - channel_free(c); - goto out; - } - break; - case SSH2_MSG_GLOBAL_REQUEST: - if ((original = sshbuf_from(cp, have)) == NULL) { - error("%s: alloc", __func__); - goto out; - } - if ((r = sshbuf_get_cstring(original, &ctype, NULL)) != 0) { - error("%s: parse error %s", __func__, ssh_err(r)); - goto out; - } - if (strcmp(ctype, "tcpip-forward") != 0) { - error("%s: unsupported request %s", __func__, ctype); - goto out; - } - if ((r = sshbuf_get_u8(original, NULL)) != 0 || - (r = sshbuf_get_cstring(original, &listen_host, NULL)) != 0 || - (r = sshbuf_get_u32(original, &listen_port)) != 0) { - error("%s: parse error %s", __func__, ssh_err(r)); - goto out; - } - if (listen_port > 65535) { - error("%s: tcpip-forward for %s: bad port %u", - __func__, listen_host, listen_port); - goto out; - } - /* Record that connection to this host/port is permitted. */ - permitted_opens = xreallocarray(permitted_opens, - num_permitted_opens + 1, sizeof(*permitted_opens)); - idx = num_permitted_opens++; - permitted_opens[idx].host_to_connect = xstrdup(""); - permitted_opens[idx].port_to_connect = -1; - permitted_opens[idx].listen_host = listen_host; - permitted_opens[idx].listen_port = (int)listen_port; - permitted_opens[idx].downstream = downstream; - listen_host = NULL; - break; - case SSH2_MSG_CHANNEL_CLOSE: - if (have < 4) - break; - remote_id = PEEK_U32(cp); - if ((c = channel_by_remote_id(remote_id)) != NULL) { - if (c->flags & CHAN_CLOSE_RCVD) - channel_free(c); - else - c->flags |= CHAN_CLOSE_SENT; - } - break; - } - if (modified) { - if ((r = sshpkt_start(ssh, type)) != 0 || - (r = sshpkt_putb(ssh, modified)) != 0 || - (r = sshpkt_send(ssh)) != 0) { - error("%s: send %s", __func__, ssh_err(r)); - goto out; - } - } else { - if ((r = sshpkt_start(ssh, type)) != 0 || - (r = sshpkt_put(ssh, cp, have)) != 0 || - (r = sshpkt_send(ssh)) != 0) { - error("%s: send %s", __func__, ssh_err(r)); - goto out; - } - } - ret = 0; - out: - free(ctype); - free(listen_host); - sshbuf_free(original); - sshbuf_free(modified); - return ret; -} - -/* - * receive packets from upstream server and de-multiplex packets - * to correct downstream: - * implemented as a helper for channel input handlers, - * replaces local (proxy) channel ID with downstream channel ID. - */ -int -channel_proxy_upstream(Channel *c, int type, u_int32_t seq, void *ctxt) -{ - struct ssh *ssh = active_state; - struct sshbuf *b = NULL; - Channel *downstream; - const u_char *cp = NULL; - size_t len; - int r; - - /* - * When receiving packets from the peer we need to check whether we - * need to forward the packets to the mux client. In this case we - * restore the orignal channel id and keep track of CLOSE messages, - * so we can cleanup the channel. - */ - if (c == NULL || c->type != SSH_CHANNEL_MUX_PROXY) - return 0; - if ((downstream = c->mux_ctx) == NULL) - return 0; - switch (type) { - case SSH2_MSG_CHANNEL_CLOSE: - case SSH2_MSG_CHANNEL_DATA: - case SSH2_MSG_CHANNEL_EOF: - case SSH2_MSG_CHANNEL_EXTENDED_DATA: - case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION: - case SSH2_MSG_CHANNEL_OPEN_FAILURE: - case SSH2_MSG_CHANNEL_WINDOW_ADJUST: - case SSH2_MSG_CHANNEL_SUCCESS: - case SSH2_MSG_CHANNEL_FAILURE: - case SSH2_MSG_CHANNEL_REQUEST: - break; - default: - debug2("%s: channel %u: unsupported type %u", __func__, - c->self, type); - return 0; - } - if ((b = sshbuf_new()) == NULL) { - error("%s: alloc reply", __func__); - goto out; - } - /* get remaining payload (after id) */ - cp = sshpkt_ptr(ssh, &len); - if (cp == NULL) { - error("%s: no packet", __func__); - goto out; - } - /* translate id and send to muxclient */ - if ((r = sshbuf_put_u8(b, 0)) != 0 || /* padlen */ - (r = sshbuf_put_u8(b, type)) != 0 || - (r = sshbuf_put_u32(b, c->mux_downstream_id)) != 0 || - (r = sshbuf_put(b, cp, len)) != 0 || - (r = sshbuf_put_stringb(&downstream->output, b)) != 0) { - error("%s: compose for muxclient %s", __func__, ssh_err(r)); - goto out; - } - /* sshbuf_dump(b, stderr); */ - if (ssh_packet_log_type(type)) - debug3("%s: channel %u: up->down: type %u", __func__, c->self, - type); - out: - /* update state */ - switch (type) { - case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION: - /* record remote_id for SSH2_MSG_CHANNEL_CLOSE */ - if (cp && len > 4) - c->remote_id = PEEK_U32(cp); - break; - case SSH2_MSG_CHANNEL_CLOSE: - if (c->flags & CHAN_CLOSE_SENT) - channel_free(c); - else - c->flags |= CHAN_CLOSE_RCVD; - break; - } - sshbuf_free(b); - return 1; -} - -/* -- protocol input */ - -/* ARGSUSED */ -int -channel_input_data(int type, u_int32_t seq, void *ctxt) -{ - int id; - const u_char *data; - u_int data_len, win_len; - Channel *c; - - /* Get the channel number and verify it. */ - id = packet_get_int(); - c = channel_lookup(id); - if (c == NULL) - packet_disconnect("Received data for nonexistent channel %d.", id); - if (channel_proxy_upstream(c, type, seq, ctxt)) - return 0; - - /* Ignore any data for non-open channels (might happen on close) */ - if (c->type != SSH_CHANNEL_OPEN && - c->type != SSH_CHANNEL_X11_OPEN) - return 0; - - /* Get the data. */ - data = packet_get_string_ptr(&data_len); - win_len = data_len; - if (c->datagram) - win_len += 4; /* string length header */ - - /* - * Ignore data for protocol > 1.3 if output end is no longer open. - * For protocol 2 the sending side is reducing its window as it sends - * data, so we must 'fake' consumption of the data in order to ensure - * that window updates are sent back. Otherwise the connection might - * deadlock. - */ - if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { - if (compat20) { - c->local_window -= win_len; - c->local_consumed += win_len; - } - return 0; - } - - if (compat20) { - if (win_len > c->local_maxpacket) { - logit("channel %d: rcvd big packet %d, maxpack %d", - c->self, win_len, c->local_maxpacket); - } - if (win_len > c->local_window) { - logit("channel %d: rcvd too much data %d, win %d", - c->self, win_len, c->local_window); - return 0; - } - c->local_window -= win_len; - } - if (c->datagram) - buffer_put_string(&c->output, data, data_len); - else - buffer_append(&c->output, data, data_len); - packet_check_eom(); - return 0; -} - -/* ARGSUSED */ -int -channel_input_extended_data(int type, u_int32_t seq, void *ctxt) -{ - int id; - char *data; - u_int data_len, tcode; - Channel *c; - - /* Get the channel number and verify it. */ - id = packet_get_int(); - c = channel_lookup(id); - - if (c == NULL) - packet_disconnect("Received extended_data for bad channel %d.", id); - if (channel_proxy_upstream(c, type, seq, ctxt)) - return 0; - if (c->type != SSH_CHANNEL_OPEN) { - logit("channel %d: ext data for non open", id); - return 0; - } - if (c->flags & CHAN_EOF_RCVD) { - if (datafellows & SSH_BUG_EXTEOF) - debug("channel %d: accepting ext data after eof", id); - else - packet_disconnect("Received extended_data after EOF " - "on channel %d.", id); - } - tcode = packet_get_int(); - if (c->efd == -1 || - c->extended_usage != CHAN_EXTENDED_WRITE || - tcode != SSH2_EXTENDED_DATA_STDERR) { - logit("channel %d: bad ext data", c->self); - return 0; - } - data = packet_get_string(&data_len); - packet_check_eom(); - if (data_len > c->local_window) { - logit("channel %d: rcvd too much extended_data %d, win %d", - c->self, data_len, c->local_window); - free(data); - return 0; - } - debug2("channel %d: rcvd ext data %d", c->self, data_len); - c->local_window -= data_len; - buffer_append(&c->extended, data, data_len); - free(data); - return 0; -} - -/* ARGSUSED */ -int -channel_input_ieof(int type, u_int32_t seq, void *ctxt) -{ - int id; - Channel *c; - - id = packet_get_int(); - packet_check_eom(); - c = channel_lookup(id); - if (c == NULL) - packet_disconnect("Received ieof for nonexistent channel %d.", id); - if (channel_proxy_upstream(c, type, seq, ctxt)) - return 0; - chan_rcvd_ieof(c); - - /* XXX force input close */ - if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { - debug("channel %d: FORCE input drain", c->self); - c->istate = CHAN_INPUT_WAIT_DRAIN; - if (buffer_len(&c->input) == 0) - chan_ibuf_empty(c); - } - return 0; -} - -/* ARGSUSED */ -int -channel_input_close(int type, u_int32_t seq, void *ctxt) -{ - int id; - Channel *c; - - id = packet_get_int(); - packet_check_eom(); - c = channel_lookup(id); - if (c == NULL) - packet_disconnect("Received close for nonexistent channel %d.", id); - if (channel_proxy_upstream(c, type, seq, ctxt)) - return 0; - /* - * Send a confirmation that we have closed the channel and no more - * data is coming for it. - */ - packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); - packet_put_int(c->remote_id); - packet_send(); - - /* - * If the channel is in closed state, we have sent a close request, - * and the other side will eventually respond with a confirmation. - * Thus, we cannot free the channel here, because then there would be - * no-one to receive the confirmation. The channel gets freed when - * the confirmation arrives. - */ - if (c->type != SSH_CHANNEL_CLOSED) { - /* - * Not a closed channel - mark it as draining, which will - * cause it to be freed later. - */ - buffer_clear(&c->input); - c->type = SSH_CHANNEL_OUTPUT_DRAINING; - } - return 0; -} - -/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ -/* ARGSUSED */ -int -channel_input_oclose(int type, u_int32_t seq, void *ctxt) -{ - int id = packet_get_int(); - Channel *c = channel_lookup(id); - - if (c == NULL) - packet_disconnect("Received oclose for nonexistent channel %d.", id); - if (channel_proxy_upstream(c, type, seq, ctxt)) - return 0; - packet_check_eom(); - chan_rcvd_oclose(c); - return 0; -} - -/* ARGSUSED */ -int -channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) -{ - int id = packet_get_int(); - Channel *c = channel_lookup(id); - - if (c == NULL) - packet_disconnect("Received close confirmation for " - "out-of-range channel %d.", id); - if (channel_proxy_upstream(c, type, seq, ctxt)) - return 0; - packet_check_eom(); - if (c->type != SSH_CHANNEL_CLOSED && c->type != SSH_CHANNEL_ABANDONED) - packet_disconnect("Received close confirmation for " - "non-closed channel %d (type %d).", id, c->type); - channel_free(c); - return 0; -} - -/* ARGSUSED */ -int -channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) -{ - int id, remote_id; - Channel *c; - - id = packet_get_int(); - c = channel_lookup(id); - - if (c==NULL) - packet_disconnect("Received open confirmation for " - "unknown channel %d.", id); - if (channel_proxy_upstream(c, type, seq, ctxt)) - return 0; - if (c->type != SSH_CHANNEL_OPENING) - packet_disconnect("Received open confirmation for " - "non-opening channel %d.", id); - remote_id = packet_get_int(); - /* Record the remote channel number and mark that the channel is now open. */ - c->remote_id = remote_id; - c->type = SSH_CHANNEL_OPEN; - - if (compat20) { - c->remote_window = packet_get_int(); - c->remote_maxpacket = packet_get_int(); - if (c->open_confirm) { - debug2("callback start"); - c->open_confirm(c->self, 1, c->open_confirm_ctx); - debug2("callback done"); - } - debug2("channel %d: open confirm rwindow %u rmax %u", c->self, - c->remote_window, c->remote_maxpacket); - } - packet_check_eom(); - return 0; -} - -static char * -reason2txt(int reason) -{ - switch (reason) { - case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: - return "administratively prohibited"; - case SSH2_OPEN_CONNECT_FAILED: - return "connect failed"; - case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: - return "unknown channel type"; - case SSH2_OPEN_RESOURCE_SHORTAGE: - return "resource shortage"; - } - return "unknown reason"; -} - -/* ARGSUSED */ -int -channel_input_open_failure(int type, u_int32_t seq, void *ctxt) -{ - int id, reason; - char *msg = NULL, *lang = NULL; - Channel *c; - - id = packet_get_int(); - c = channel_lookup(id); - - if (c==NULL) - packet_disconnect("Received open failure for " - "unknown channel %d.", id); - if (channel_proxy_upstream(c, type, seq, ctxt)) - return 0; - if (c->type != SSH_CHANNEL_OPENING) - packet_disconnect("Received open failure for " - "non-opening channel %d.", id); - if (compat20) { - reason = packet_get_int(); - if (!(datafellows & SSH_BUG_OPENFAILURE)) { - msg = packet_get_string(NULL); - lang = packet_get_string(NULL); - } - logit("channel %d: open failed: %s%s%s", id, - reason2txt(reason), msg ? ": ": "", msg ? msg : ""); - free(msg); - free(lang); - if (c->open_confirm) { - debug2("callback start"); - c->open_confirm(c->self, 0, c->open_confirm_ctx); - debug2("callback done"); - } - } - packet_check_eom(); - /* Schedule the channel for cleanup/deletion. */ - chan_mark_dead(c); - return 0; -} - -/* ARGSUSED */ -int -channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) -{ - Channel *c; - int id; - u_int adjust, tmp; - - if (!compat20) - return 0; - - /* Get the channel number and verify it. */ - id = packet_get_int(); - c = channel_lookup(id); - - if (c == NULL) { - logit("Received window adjust for non-open channel %d.", id); - return 0; - } - if (channel_proxy_upstream(c, type, seq, ctxt)) - return 0; - adjust = packet_get_int(); - packet_check_eom(); - debug2("channel %d: rcvd adjust %u", id, adjust); - if ((tmp = c->remote_window + adjust) < c->remote_window) - fatal("channel %d: adjust %u overflows remote window %u", - id, adjust, c->remote_window); - c->remote_window = tmp; - return 0; -} - -/* ARGSUSED */ -int -channel_input_port_open(int type, u_int32_t seq, void *ctxt) -{ - Channel *c = NULL; - u_short host_port; - char *host, *originator_string; - int remote_id; - - remote_id = packet_get_int(); - host = packet_get_string(NULL); - host_port = packet_get_int(); - - if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { - originator_string = packet_get_string(NULL); - } else { - originator_string = xstrdup("unknown (remote did not supply name)"); - } - packet_check_eom(); - c = channel_connect_to_port(host, host_port, - "connected socket", originator_string); - free(originator_string); - free(host); - if (c == NULL) { - packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); - packet_put_int(remote_id); - packet_send(); - } else - c->remote_id = remote_id; - return 0; -} - -/* ARGSUSED */ -int -channel_input_status_confirm(int type, u_int32_t seq, void *ctxt) -{ - Channel *c; - struct channel_confirm *cc; - int id; - - /* Reset keepalive timeout */ - packet_set_alive_timeouts(0); - - id = packet_get_int(); - debug2("channel_input_status_confirm: type %d id %d", type, id); - - if ((c = channel_lookup(id)) == NULL) { - logit("channel_input_status_confirm: %d: unknown", id); - return 0; - } - if (channel_proxy_upstream(c, type, seq, ctxt)) - return 0; - packet_check_eom(); - if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL) - return 0; - cc->cb(type, c, cc->ctx); - TAILQ_REMOVE(&c->status_confirms, cc, entry); - explicit_bzero(cc, sizeof(*cc)); - free(cc); - return 0; -} - -/* -- tcp forwarding */ - -void -channel_set_af(int af) -{ - IPv4or6 = af; -} - - -/* - * Determine whether or not a port forward listens to loopback, the - * specified address or wildcard. On the client, a specified bind - * address will always override gateway_ports. On the server, a - * gateway_ports of 1 (``yes'') will override the client's specification - * and force a wildcard bind, whereas a value of 2 (``clientspecified'') - * will bind to whatever address the client asked for. - * - * Special-case listen_addrs are: - * - * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR - * "" (empty string), "*" -> wildcard v4/v6 - * "localhost" -> loopback v4/v6 - * "127.0.0.1" / "::1" -> accepted even if gateway_ports isn't set - */ -static const char * -channel_fwd_bind_addr(const char *listen_addr, int *wildcardp, - int is_client, struct ForwardOptions *fwd_opts) -{ - const char *addr = NULL; - int wildcard = 0; - - if (listen_addr == NULL) { - /* No address specified: default to gateway_ports setting */ - if (fwd_opts->gateway_ports) - wildcard = 1; - } else if (fwd_opts->gateway_ports || is_client) { - if (((datafellows & SSH_OLD_FORWARD_ADDR) && - strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) || - *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || - (!is_client && fwd_opts->gateway_ports == 1)) { - wildcard = 1; - /* - * Notify client if they requested a specific listen - * address and it was overridden. - */ - if (*listen_addr != '\0' && - strcmp(listen_addr, "0.0.0.0") != 0 && - strcmp(listen_addr, "*") != 0) { - packet_send_debug("Forwarding listen address " - "\"%s\" overridden by server " - "GatewayPorts", listen_addr); - } - } else if (strcmp(listen_addr, "localhost") != 0 || - strcmp(listen_addr, "127.0.0.1") == 0 || - strcmp(listen_addr, "::1") == 0) { - /* Accept localhost address when GatewayPorts=yes */ - addr = listen_addr; - } - } else if (strcmp(listen_addr, "127.0.0.1") == 0 || - strcmp(listen_addr, "::1") == 0) { - /* - * If a specific IPv4/IPv6 localhost address has been - * requested then accept it even if gateway_ports is in - * effect. This allows the client to prefer IPv4 or IPv6. - */ - addr = listen_addr; - } - if (wildcardp != NULL) - *wildcardp = wildcard; - return addr; -} - -static int -channel_setup_fwd_listener_tcpip(int type, struct Forward *fwd, - int *allocated_listen_port, struct ForwardOptions *fwd_opts) -{ - Channel *c; - int sock, r, success = 0, wildcard = 0, is_client; - struct addrinfo hints, *ai, *aitop; - const char *host, *addr; - char ntop[NI_MAXHOST], strport[NI_MAXSERV]; - in_port_t *lport_p; - - is_client = (type == SSH_CHANNEL_PORT_LISTENER); - - if (is_client && fwd->connect_path != NULL) { - host = fwd->connect_path; - } else { - host = (type == SSH_CHANNEL_RPORT_LISTENER) ? - fwd->listen_host : fwd->connect_host; - if (host == NULL) { - error("No forward host name."); - return 0; - } - if (strlen(host) >= NI_MAXHOST) { - error("Forward host name too long."); - return 0; - } - } - - /* Determine the bind address, cf. channel_fwd_bind_addr() comment */ - addr = channel_fwd_bind_addr(fwd->listen_host, &wildcard, - is_client, fwd_opts); - debug3("%s: type %d wildcard %d addr %s", __func__, - type, wildcard, (addr == NULL) ? "NULL" : addr); - - /* - * getaddrinfo returns a loopback address if the hostname is - * set to NULL and hints.ai_flags is not AI_PASSIVE - */ - memset(&hints, 0, sizeof(hints)); - hints.ai_family = IPv4or6; - hints.ai_flags = wildcard ? AI_PASSIVE : 0; - hints.ai_socktype = SOCK_STREAM; - snprintf(strport, sizeof strport, "%d", fwd->listen_port); - if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { - if (addr == NULL) { - /* This really shouldn't happen */ - packet_disconnect("getaddrinfo: fatal error: %s", - ssh_gai_strerror(r)); - } else { - error("%s: getaddrinfo(%.64s): %s", __func__, addr, - ssh_gai_strerror(r)); - } - return 0; - } - if (allocated_listen_port != NULL) - *allocated_listen_port = 0; - for (ai = aitop; ai; ai = ai->ai_next) { - switch (ai->ai_family) { - case AF_INET: - lport_p = &((struct sockaddr_in *)ai->ai_addr)-> - sin_port; - break; - case AF_INET6: - lport_p = &((struct sockaddr_in6 *)ai->ai_addr)-> - sin6_port; - break; - default: - continue; - } - /* - * If allocating a port for -R forwards, then use the - * same port for all address families. - */ - if (type == SSH_CHANNEL_RPORT_LISTENER && fwd->listen_port == 0 && - allocated_listen_port != NULL && *allocated_listen_port > 0) - *lport_p = htons(*allocated_listen_port); - - if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), - strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { - error("%s: getnameinfo failed", __func__); - continue; - } - /* Create a port to listen for the host. */ - sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); - if (sock < 0) { - /* this is no error since kernel may not support ipv6 */ - verbose("socket: %.100s", strerror(errno)); - continue; - } - - channel_set_reuseaddr(sock); - if (ai->ai_family == AF_INET6) - sock_set_v6only(sock); - - debug("Local forwarding listening on %s port %s.", - ntop, strport); - - /* Bind the socket to the address. */ - if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { - /* address can be in use ipv6 address is already bound */ - if (!ai->ai_next) - error("bind: %.100s", strerror(errno)); - else - verbose("bind: %.100s", strerror(errno)); - - close(sock); - continue; - } - /* Start listening for connections on the socket. */ - if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { - error("listen: %.100s", strerror(errno)); - close(sock); - continue; - } - - /* - * fwd->listen_port == 0 requests a dynamically allocated port - - * record what we got. - */ - if (type == SSH_CHANNEL_RPORT_LISTENER && fwd->listen_port == 0 && - allocated_listen_port != NULL && - *allocated_listen_port == 0) { - *allocated_listen_port = get_local_port(sock); - debug("Allocated listen port %d", - *allocated_listen_port); - } - - /* Allocate a channel number for the socket. */ - c = channel_new("port listener", type, sock, sock, -1, - CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, - 0, "port listener", 1); - c->path = xstrdup(host); - c->host_port = fwd->connect_port; - c->listening_addr = addr == NULL ? NULL : xstrdup(addr); - if (fwd->listen_port == 0 && allocated_listen_port != NULL && - !(datafellows & SSH_BUG_DYNAMIC_RPORT)) - c->listening_port = *allocated_listen_port; - else - c->listening_port = fwd->listen_port; - success = 1; - } - if (success == 0) - error("%s: cannot listen to port: %d", __func__, - fwd->listen_port); - freeaddrinfo(aitop); - return success; -} - -static int -channel_setup_fwd_listener_streamlocal(int type, struct Forward *fwd, - struct ForwardOptions *fwd_opts) -{ - struct sockaddr_un sunaddr; - const char *path; - Channel *c; - int port, sock; - mode_t omask; - - switch (type) { - case SSH_CHANNEL_UNIX_LISTENER: - if (fwd->connect_path != NULL) { - if (strlen(fwd->connect_path) > sizeof(sunaddr.sun_path)) { - error("Local connecting path too long: %s", - fwd->connect_path); - return 0; - } - path = fwd->connect_path; - port = PORT_STREAMLOCAL; - } else { - if (fwd->connect_host == NULL) { - error("No forward host name."); - return 0; - } - if (strlen(fwd->connect_host) >= NI_MAXHOST) { - error("Forward host name too long."); - return 0; - } - path = fwd->connect_host; - port = fwd->connect_port; - } - break; - case SSH_CHANNEL_RUNIX_LISTENER: - path = fwd->listen_path; - port = PORT_STREAMLOCAL; - break; - default: - error("%s: unexpected channel type %d", __func__, type); - return 0; - } - - if (fwd->listen_path == NULL) { - error("No forward path name."); - return 0; - } - if (strlen(fwd->listen_path) > sizeof(sunaddr.sun_path)) { - error("Local listening path too long: %s", fwd->listen_path); - return 0; - } - - debug3("%s: type %d path %s", __func__, type, fwd->listen_path); - - /* Start a Unix domain listener. */ - omask = umask(fwd_opts->streamlocal_bind_mask); - sock = unix_listener(fwd->listen_path, SSH_LISTEN_BACKLOG, - fwd_opts->streamlocal_bind_unlink); - umask(omask); - if (sock < 0) - return 0; - - debug("Local forwarding listening on path %s.", fwd->listen_path); - - /* Allocate a channel number for the socket. */ - c = channel_new("unix listener", type, sock, sock, -1, - CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, - 0, "unix listener", 1); - c->path = xstrdup(path); - c->host_port = port; - c->listening_port = PORT_STREAMLOCAL; - c->listening_addr = xstrdup(fwd->listen_path); - return 1; -} - -static int -channel_cancel_rport_listener_tcpip(const char *host, u_short port) -{ - u_int i; - int found = 0; - - for (i = 0; i < channels_alloc; i++) { - Channel *c = channels[i]; - if (c == NULL || c->type != SSH_CHANNEL_RPORT_LISTENER) - continue; - if (strcmp(c->path, host) == 0 && c->listening_port == port) { - debug2("%s: close channel %d", __func__, i); - channel_free(c); - found = 1; - } - } - - return (found); -} - -static int -channel_cancel_rport_listener_streamlocal(const char *path) -{ - u_int i; - int found = 0; - - for (i = 0; i < channels_alloc; i++) { - Channel *c = channels[i]; - if (c == NULL || c->type != SSH_CHANNEL_RUNIX_LISTENER) - continue; - if (c->path == NULL) - continue; - if (strcmp(c->path, path) == 0) { - debug2("%s: close channel %d", __func__, i); - channel_free(c); - found = 1; - } - } - - return (found); -} - -int -channel_cancel_rport_listener(struct Forward *fwd) -{ - if (fwd->listen_path != NULL) - return channel_cancel_rport_listener_streamlocal(fwd->listen_path); - else - return channel_cancel_rport_listener_tcpip(fwd->listen_host, fwd->listen_port); -} - -static int -channel_cancel_lport_listener_tcpip(const char *lhost, u_short lport, - int cport, struct ForwardOptions *fwd_opts) -{ - u_int i; - int found = 0; - const char *addr = channel_fwd_bind_addr(lhost, NULL, 1, fwd_opts); - - for (i = 0; i < channels_alloc; i++) { - Channel *c = channels[i]; - if (c == NULL || c->type != SSH_CHANNEL_PORT_LISTENER) - continue; - if (c->listening_port != lport) - continue; - if (cport == CHANNEL_CANCEL_PORT_STATIC) { - /* skip dynamic forwardings */ - if (c->host_port == 0) - continue; - } else { - if (c->host_port != cport) - continue; - } - if ((c->listening_addr == NULL && addr != NULL) || - (c->listening_addr != NULL && addr == NULL)) - continue; - if (addr == NULL || strcmp(c->listening_addr, addr) == 0) { - debug2("%s: close channel %d", __func__, i); - channel_free(c); - found = 1; - } - } - - return (found); -} - -static int -channel_cancel_lport_listener_streamlocal(const char *path) -{ - u_int i; - int found = 0; - - if (path == NULL) { - error("%s: no path specified.", __func__); - return 0; - } - - for (i = 0; i < channels_alloc; i++) { - Channel *c = channels[i]; - if (c == NULL || c->type != SSH_CHANNEL_UNIX_LISTENER) - continue; - if (c->listening_addr == NULL) - continue; - if (strcmp(c->listening_addr, path) == 0) { - debug2("%s: close channel %d", __func__, i); - channel_free(c); - found = 1; - } - } - - return (found); -} - -int -channel_cancel_lport_listener(struct Forward *fwd, int cport, struct ForwardOptions *fwd_opts) -{ - if (fwd->listen_path != NULL) - return channel_cancel_lport_listener_streamlocal(fwd->listen_path); - else - return channel_cancel_lport_listener_tcpip(fwd->listen_host, fwd->listen_port, cport, fwd_opts); -} - -/* protocol local port fwd, used by ssh (and sshd in v1) */ -int -channel_setup_local_fwd_listener(struct Forward *fwd, struct ForwardOptions *fwd_opts) -{ - if (fwd->listen_path != NULL) { - return channel_setup_fwd_listener_streamlocal( - SSH_CHANNEL_UNIX_LISTENER, fwd, fwd_opts); - } else { - return channel_setup_fwd_listener_tcpip(SSH_CHANNEL_PORT_LISTENER, - fwd, NULL, fwd_opts); - } -} - -/* protocol v2 remote port fwd, used by sshd */ -int -channel_setup_remote_fwd_listener(struct Forward *fwd, - int *allocated_listen_port, struct ForwardOptions *fwd_opts) -{ - if (fwd->listen_path != NULL) { - return channel_setup_fwd_listener_streamlocal( - SSH_CHANNEL_RUNIX_LISTENER, fwd, fwd_opts); - } else { - return channel_setup_fwd_listener_tcpip( - SSH_CHANNEL_RPORT_LISTENER, fwd, allocated_listen_port, - fwd_opts); - } -} - -/* - * Translate the requested rfwd listen host to something usable for - * this server. - */ -static const char * -channel_rfwd_bind_host(const char *listen_host) -{ - if (listen_host == NULL) { - if (datafellows & SSH_BUG_RFWD_ADDR) - return "127.0.0.1"; - else - return "localhost"; - } else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) { - if (datafellows & SSH_BUG_RFWD_ADDR) - return "0.0.0.0"; - else - return ""; - } else - return listen_host; -} - -/* - * Initiate forwarding of connections to port "port" on remote host through - * the secure channel to host:port from local side. - * Returns handle (index) for updating the dynamic listen port with - * channel_update_permitted_opens(). - */ -int -channel_request_remote_forwarding(struct Forward *fwd) -{ - int type, success = 0, idx = -1; - - /* Send the forward request to the remote side. */ - if (compat20) { - packet_start(SSH2_MSG_GLOBAL_REQUEST); - if (fwd->listen_path != NULL) { - packet_put_cstring("streamlocal-forward@openssh.com"); - packet_put_char(1); /* boolean: want reply */ - packet_put_cstring(fwd->listen_path); - } else { - packet_put_cstring("tcpip-forward"); - packet_put_char(1); /* boolean: want reply */ - packet_put_cstring(channel_rfwd_bind_host(fwd->listen_host)); - packet_put_int(fwd->listen_port); - } - packet_send(); - packet_write_wait(); - /* Assume that server accepts the request */ - success = 1; - } else if (fwd->listen_path == NULL) { - packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); - packet_put_int(fwd->listen_port); - packet_put_cstring(fwd->connect_host); - packet_put_int(fwd->connect_port); - packet_send(); - packet_write_wait(); - - /* Wait for response from the remote side. */ - type = packet_read(); - switch (type) { - case SSH_SMSG_SUCCESS: - success = 1; - break; - case SSH_SMSG_FAILURE: - break; - default: - /* Unknown packet */ - packet_disconnect("Protocol error for port forward request:" - "received packet type %d.", type); - } - } else { - logit("Warning: Server does not support remote stream local forwarding."); - } - if (success) { - /* Record that connection to this host/port is permitted. */ - permitted_opens = xreallocarray(permitted_opens, - num_permitted_opens + 1, sizeof(*permitted_opens)); - idx = num_permitted_opens++; - if (fwd->connect_path != NULL) { - permitted_opens[idx].host_to_connect = - xstrdup(fwd->connect_path); - permitted_opens[idx].port_to_connect = - PORT_STREAMLOCAL; - } else { - permitted_opens[idx].host_to_connect = - xstrdup(fwd->connect_host); - permitted_opens[idx].port_to_connect = - fwd->connect_port; - } - if (fwd->listen_path != NULL) { - permitted_opens[idx].listen_host = NULL; - permitted_opens[idx].listen_path = - xstrdup(fwd->listen_path); - permitted_opens[idx].listen_port = PORT_STREAMLOCAL; - } else { - permitted_opens[idx].listen_host = - fwd->listen_host ? xstrdup(fwd->listen_host) : NULL; - permitted_opens[idx].listen_path = NULL; - permitted_opens[idx].listen_port = fwd->listen_port; - } - permitted_opens[idx].downstream = NULL; - } - return (idx); -} - -static int -open_match(ForwardPermission *allowed_open, const char *requestedhost, - int requestedport) -{ - if (allowed_open->host_to_connect == NULL) - return 0; - if (allowed_open->port_to_connect != FWD_PERMIT_ANY_PORT && - allowed_open->port_to_connect != requestedport) - return 0; - if (strcmp(allowed_open->host_to_connect, FWD_PERMIT_ANY_HOST) != 0 && - strcmp(allowed_open->host_to_connect, requestedhost) != 0) - return 0; - return 1; -} - -/* - * Note that in the listen host/port case - * we don't support FWD_PERMIT_ANY_PORT and - * need to translate between the configured-host (listen_host) - * and what we've sent to the remote server (channel_rfwd_bind_host) - */ -static int -open_listen_match_tcpip(ForwardPermission *allowed_open, - const char *requestedhost, u_short requestedport, int translate) -{ - const char *allowed_host; - - if (allowed_open->host_to_connect == NULL) - return 0; - if (allowed_open->listen_port != requestedport) - return 0; - if (!translate && allowed_open->listen_host == NULL && - requestedhost == NULL) - return 1; - allowed_host = translate ? - channel_rfwd_bind_host(allowed_open->listen_host) : - allowed_open->listen_host; - if (allowed_host == NULL || - strcmp(allowed_host, requestedhost) != 0) - return 0; - return 1; -} - -static int -open_listen_match_streamlocal(ForwardPermission *allowed_open, - const char *requestedpath) -{ - if (allowed_open->host_to_connect == NULL) - return 0; - if (allowed_open->listen_port != PORT_STREAMLOCAL) - return 0; - if (allowed_open->listen_path == NULL || - strcmp(allowed_open->listen_path, requestedpath) != 0) - return 0; - return 1; -} - -/* - * Request cancellation of remote forwarding of connection host:port from - * local side. - */ -static int -channel_request_rforward_cancel_tcpip(const char *host, u_short port) -{ - int i; - - if (!compat20) - return -1; - - for (i = 0; i < num_permitted_opens; i++) { - if (open_listen_match_tcpip(&permitted_opens[i], host, port, 0)) - break; - } - if (i >= num_permitted_opens) { - debug("%s: requested forward not found", __func__); - return -1; - } - packet_start(SSH2_MSG_GLOBAL_REQUEST); - packet_put_cstring("cancel-tcpip-forward"); - packet_put_char(0); - packet_put_cstring(channel_rfwd_bind_host(host)); - packet_put_int(port); - packet_send(); - - permitted_opens[i].listen_port = 0; - permitted_opens[i].port_to_connect = 0; - free(permitted_opens[i].host_to_connect); - permitted_opens[i].host_to_connect = NULL; - free(permitted_opens[i].listen_host); - permitted_opens[i].listen_host = NULL; - permitted_opens[i].listen_path = NULL; - permitted_opens[i].downstream = NULL; - - return 0; -} - -/* - * Request cancellation of remote forwarding of Unix domain socket - * path from local side. - */ -static int -channel_request_rforward_cancel_streamlocal(const char *path) -{ - int i; - - if (!compat20) - return -1; - - for (i = 0; i < num_permitted_opens; i++) { - if (open_listen_match_streamlocal(&permitted_opens[i], path)) - break; - } - if (i >= num_permitted_opens) { - debug("%s: requested forward not found", __func__); - return -1; - } - packet_start(SSH2_MSG_GLOBAL_REQUEST); - packet_put_cstring("cancel-streamlocal-forward@openssh.com"); - packet_put_char(0); - packet_put_cstring(path); - packet_send(); - - permitted_opens[i].listen_port = 0; - permitted_opens[i].port_to_connect = 0; - free(permitted_opens[i].host_to_connect); - permitted_opens[i].host_to_connect = NULL; - permitted_opens[i].listen_host = NULL; - free(permitted_opens[i].listen_path); - permitted_opens[i].listen_path = NULL; - permitted_opens[i].downstream = NULL; - - return 0; -} - -/* - * Request cancellation of remote forwarding of a connection from local side. - */ -int -channel_request_rforward_cancel(struct Forward *fwd) -{ - if (fwd->listen_path != NULL) { - return (channel_request_rforward_cancel_streamlocal( - fwd->listen_path)); - } else { - return (channel_request_rforward_cancel_tcpip(fwd->listen_host, - fwd->listen_port ? fwd->listen_port : fwd->allocated_port)); - } -} - -/* - * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates - * listening for the port, and sends back a success reply (or disconnect - * message if there was an error). - */ -int -channel_input_port_forward_request(int is_root, struct ForwardOptions *fwd_opts) -{ - int success = 0; - struct Forward fwd; - - /* Get arguments from the packet. */ - memset(&fwd, 0, sizeof(fwd)); - fwd.listen_port = packet_get_int(); - fwd.connect_host = packet_get_string(NULL); - fwd.connect_port = packet_get_int(); - - /* - * Check that an unprivileged user is not trying to forward a - * privileged port. - */ - if (fwd.listen_port < IPPORT_RESERVED && !is_root) - packet_disconnect( - "Requested forwarding of port %d but user is not root.", - fwd.listen_port); - if (fwd.connect_port == 0) - packet_disconnect("Dynamic forwarding denied."); - - /* Initiate forwarding */ - success = channel_setup_local_fwd_listener(&fwd, fwd_opts); - - /* Free the argument string. */ - free(fwd.connect_host); - - return (success ? 0 : -1); -} - -/* - * Permits opening to any host/port if permitted_opens[] is empty. This is - * usually called by the server, because the user could connect to any port - * anyway, and the server has no way to know but to trust the client anyway. - */ -void -channel_permit_all_opens(void) -{ - if (num_permitted_opens == 0) - all_opens_permitted = 1; -} - -void -channel_add_permitted_opens(char *host, int port) -{ - debug("allow port forwarding to host %s port %d", host, port); - - permitted_opens = xreallocarray(permitted_opens, - num_permitted_opens + 1, sizeof(*permitted_opens)); - permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); - permitted_opens[num_permitted_opens].port_to_connect = port; - permitted_opens[num_permitted_opens].listen_host = NULL; - permitted_opens[num_permitted_opens].listen_path = NULL; - permitted_opens[num_permitted_opens].listen_port = 0; - permitted_opens[num_permitted_opens].downstream = NULL; - num_permitted_opens++; - - all_opens_permitted = 0; -} - -/* - * Update the listen port for a dynamic remote forward, after - * the actual 'newport' has been allocated. If 'newport' < 0 is - * passed then they entry will be invalidated. - */ -void -channel_update_permitted_opens(int idx, int newport) -{ - if (idx < 0 || idx >= num_permitted_opens) { - debug("channel_update_permitted_opens: index out of range:" - " %d num_permitted_opens %d", idx, num_permitted_opens); - return; - } - debug("%s allowed port %d for forwarding to host %s port %d", - newport > 0 ? "Updating" : "Removing", - newport, - permitted_opens[idx].host_to_connect, - permitted_opens[idx].port_to_connect); - if (newport >= 0) { - permitted_opens[idx].listen_port = - (datafellows & SSH_BUG_DYNAMIC_RPORT) ? 0 : newport; - } else { - permitted_opens[idx].listen_port = 0; - permitted_opens[idx].port_to_connect = 0; - free(permitted_opens[idx].host_to_connect); - permitted_opens[idx].host_to_connect = NULL; - free(permitted_opens[idx].listen_host); - permitted_opens[idx].listen_host = NULL; - free(permitted_opens[idx].listen_path); - permitted_opens[idx].listen_path = NULL; - } -} - -int -channel_add_adm_permitted_opens(char *host, int port) -{ - debug("config allows port forwarding to host %s port %d", host, port); - - permitted_adm_opens = xreallocarray(permitted_adm_opens, - num_adm_permitted_opens + 1, sizeof(*permitted_adm_opens)); - permitted_adm_opens[num_adm_permitted_opens].host_to_connect - = xstrdup(host); - permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port; - permitted_adm_opens[num_adm_permitted_opens].listen_host = NULL; - permitted_adm_opens[num_adm_permitted_opens].listen_path = NULL; - permitted_adm_opens[num_adm_permitted_opens].listen_port = 0; - return ++num_adm_permitted_opens; -} - -void -channel_disable_adm_local_opens(void) -{ - channel_clear_adm_permitted_opens(); - permitted_adm_opens = xcalloc(sizeof(*permitted_adm_opens), 1); - permitted_adm_opens[num_adm_permitted_opens].host_to_connect = NULL; - num_adm_permitted_opens = 1; -} - -void -channel_clear_permitted_opens(void) -{ - int i; - - for (i = 0; i < num_permitted_opens; i++) { - free(permitted_opens[i].host_to_connect); - free(permitted_opens[i].listen_host); - free(permitted_opens[i].listen_path); - } - free(permitted_opens); - permitted_opens = NULL; - num_permitted_opens = 0; -} - -void -channel_clear_adm_permitted_opens(void) -{ - int i; - - for (i = 0; i < num_adm_permitted_opens; i++) { - free(permitted_adm_opens[i].host_to_connect); - free(permitted_adm_opens[i].listen_host); - free(permitted_adm_opens[i].listen_path); - } - free(permitted_adm_opens); - permitted_adm_opens = NULL; - num_adm_permitted_opens = 0; -} - -void -channel_print_adm_permitted_opens(void) -{ - int i; - - printf("permitopen"); - if (num_adm_permitted_opens == 0) { - printf(" any\n"); - return; - } - for (i = 0; i < num_adm_permitted_opens; i++) - if (permitted_adm_opens[i].host_to_connect == NULL) - printf(" none"); - else - printf(" %s:%d", permitted_adm_opens[i].host_to_connect, - permitted_adm_opens[i].port_to_connect); - printf("\n"); -} - -/* returns port number, FWD_PERMIT_ANY_PORT or -1 on error */ -int -permitopen_port(const char *p) -{ - int port; - - if (strcmp(p, "*") == 0) - return FWD_PERMIT_ANY_PORT; - if ((port = a2port(p)) > 0) - return port; - return -1; -} - -/* Try to start non-blocking connect to next host in cctx list */ -static int -connect_next(struct channel_connect *cctx) -{ - int sock, saved_errno; - struct sockaddr_un *sunaddr; - char ntop[NI_MAXHOST], strport[MAXIMUM(NI_MAXSERV,sizeof(sunaddr->sun_path))]; - - for (; cctx->ai; cctx->ai = cctx->ai->ai_next) { - switch (cctx->ai->ai_family) { - case AF_UNIX: - /* unix:pathname instead of host:port */ - sunaddr = (struct sockaddr_un *)cctx->ai->ai_addr; - strlcpy(ntop, "unix", sizeof(ntop)); - strlcpy(strport, sunaddr->sun_path, sizeof(strport)); - break; - case AF_INET: - case AF_INET6: - if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen, - ntop, sizeof(ntop), strport, sizeof(strport), - NI_NUMERICHOST|NI_NUMERICSERV) != 0) { - error("connect_next: getnameinfo failed"); - continue; - } - break; - default: - continue; - } - if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype, - cctx->ai->ai_protocol)) == -1) { - if (cctx->ai->ai_next == NULL) - error("socket: %.100s", strerror(errno)); - else - verbose("socket: %.100s", strerror(errno)); - continue; - } - if (set_nonblock(sock) == -1) - fatal("%s: set_nonblock(%d)", __func__, sock); - if (connect(sock, cctx->ai->ai_addr, - cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) { - debug("connect_next: host %.100s ([%.100s]:%s): " - "%.100s", cctx->host, ntop, strport, - strerror(errno)); - saved_errno = errno; - close(sock); - errno = saved_errno; - continue; /* fail -- try next */ - } - if (cctx->ai->ai_family != AF_UNIX) - set_nodelay(sock); - debug("connect_next: host %.100s ([%.100s]:%s) " - "in progress, fd=%d", cctx->host, ntop, strport, sock); - cctx->ai = cctx->ai->ai_next; - return sock; - } - return -1; -} - -static void -channel_connect_ctx_free(struct channel_connect *cctx) -{ - free(cctx->host); - if (cctx->aitop) { - if (cctx->aitop->ai_family == AF_UNIX) - free(cctx->aitop); - else - freeaddrinfo(cctx->aitop); - } - memset(cctx, 0, sizeof(*cctx)); -} - -/* Return CONNECTING channel to remote host:port or local socket path */ -static Channel * -connect_to(const char *name, int port, char *ctype, char *rname) -{ - struct addrinfo hints; - int gaierr; - int sock = -1; - char strport[NI_MAXSERV]; - struct channel_connect cctx; - Channel *c; - - memset(&cctx, 0, sizeof(cctx)); - - if (port == PORT_STREAMLOCAL) { - struct sockaddr_un *sunaddr; - struct addrinfo *ai; - - if (strlen(name) > sizeof(sunaddr->sun_path)) { - error("%.100s: %.100s", name, strerror(ENAMETOOLONG)); - return (NULL); - } - - /* - * Fake up a struct addrinfo for AF_UNIX connections. - * channel_connect_ctx_free() must check ai_family - * and use free() not freeaddirinfo() for AF_UNIX. - */ - ai = xmalloc(sizeof(*ai) + sizeof(*sunaddr)); - memset(ai, 0, sizeof(*ai) + sizeof(*sunaddr)); - ai->ai_addr = (struct sockaddr *)(ai + 1); - ai->ai_addrlen = sizeof(*sunaddr); - ai->ai_family = AF_UNIX; - ai->ai_socktype = SOCK_STREAM; - ai->ai_protocol = PF_UNSPEC; - sunaddr = (struct sockaddr_un *)ai->ai_addr; - sunaddr->sun_family = AF_UNIX; - strlcpy(sunaddr->sun_path, name, sizeof(sunaddr->sun_path)); - cctx.aitop = ai; - } else { - memset(&hints, 0, sizeof(hints)); - hints.ai_family = IPv4or6; - hints.ai_socktype = SOCK_STREAM; - snprintf(strport, sizeof strport, "%d", port); - if ((gaierr = getaddrinfo(name, strport, &hints, &cctx.aitop)) != 0) { - error("connect_to %.100s: unknown host (%s)", name, - ssh_gai_strerror(gaierr)); - return NULL; - } - } - - cctx.host = xstrdup(name); - cctx.port = port; - cctx.ai = cctx.aitop; - - if ((sock = connect_next(&cctx)) == -1) { - error("connect to %.100s port %d failed: %s", - name, port, strerror(errno)); - channel_connect_ctx_free(&cctx); - return NULL; - } - c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1, - CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1); - c->connect_ctx = cctx; - return c; -} - -/* - * returns either the newly connected channel or the downstream channel - * that needs to deal with this connection. - */ -Channel * -channel_connect_by_listen_address(const char *listen_host, - u_short listen_port, char *ctype, char *rname) -{ - int i; - - for (i = 0; i < num_permitted_opens; i++) { - if (open_listen_match_tcpip(&permitted_opens[i], listen_host, - listen_port, 1)) { - if (permitted_opens[i].downstream) - return permitted_opens[i].downstream; - return connect_to( - permitted_opens[i].host_to_connect, - permitted_opens[i].port_to_connect, ctype, rname); - } - } - error("WARNING: Server requests forwarding for unknown listen_port %d", - listen_port); - return NULL; -} - -Channel * -channel_connect_by_listen_path(const char *path, char *ctype, char *rname) -{ - int i; - - for (i = 0; i < num_permitted_opens; i++) { - if (open_listen_match_streamlocal(&permitted_opens[i], path)) { - return connect_to( - permitted_opens[i].host_to_connect, - permitted_opens[i].port_to_connect, ctype, rname); - } - } - error("WARNING: Server requests forwarding for unknown path %.100s", - path); - return NULL; -} - -/* Check if connecting to that port is permitted and connect. */ -Channel * -channel_connect_to_port(const char *host, u_short port, char *ctype, char *rname) -{ - int i, permit, permit_adm = 1; - - permit = all_opens_permitted; - if (!permit) { - for (i = 0; i < num_permitted_opens; i++) - if (open_match(&permitted_opens[i], host, port)) { - permit = 1; - break; - } - } - - if (num_adm_permitted_opens > 0) { - permit_adm = 0; - for (i = 0; i < num_adm_permitted_opens; i++) - if (open_match(&permitted_adm_opens[i], host, port)) { - permit_adm = 1; - break; - } - } - - if (!permit || !permit_adm) { - logit("Received request to connect to host %.100s port %d, " - "but the request was denied.", host, port); - return NULL; - } - return connect_to(host, port, ctype, rname); -} - -/* Check if connecting to that path is permitted and connect. */ -Channel * -channel_connect_to_path(const char *path, char *ctype, char *rname) -{ - int i, permit, permit_adm = 1; - - permit = all_opens_permitted; - if (!permit) { - for (i = 0; i < num_permitted_opens; i++) - if (open_match(&permitted_opens[i], path, PORT_STREAMLOCAL)) { - permit = 1; - break; - } - } - - if (num_adm_permitted_opens > 0) { - permit_adm = 0; - for (i = 0; i < num_adm_permitted_opens; i++) - if (open_match(&permitted_adm_opens[i], path, PORT_STREAMLOCAL)) { - permit_adm = 1; - break; - } - } - - if (!permit || !permit_adm) { - logit("Received request to connect to path %.100s, " - "but the request was denied.", path); - return NULL; - } - return connect_to(path, PORT_STREAMLOCAL, ctype, rname); -} - -void -channel_send_window_changes(void) -{ - u_int i; - struct winsize ws; - - for (i = 0; i < channels_alloc; i++) { - if (channels[i] == NULL || !channels[i]->client_tty || - channels[i]->type != SSH_CHANNEL_OPEN) - continue; - if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) - continue; - channel_request_start(i, "window-change", 0); - packet_put_int((u_int)ws.ws_col); - packet_put_int((u_int)ws.ws_row); - packet_put_int((u_int)ws.ws_xpixel); - packet_put_int((u_int)ws.ws_ypixel); - packet_send(); - } -} - -/* -- X11 forwarding */ - -/* - * Creates an internet domain socket for listening for X11 connections. - * Returns 0 and a suitable display number for the DISPLAY variable - * stored in display_numberp , or -1 if an error occurs. - */ -int -x11_create_display_inet(int x11_display_offset, int x11_use_localhost, - int single_connection, u_int *display_numberp, int **chanids) -{ - Channel *nc = NULL; - int display_number, sock; - u_short port; - struct addrinfo hints, *ai, *aitop; - char strport[NI_MAXSERV]; - int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; - - if (chanids == NULL) - return -1; - - for (display_number = x11_display_offset; - display_number < MAX_DISPLAYS; - display_number++) { - port = 6000 + display_number; - memset(&hints, 0, sizeof(hints)); - hints.ai_family = IPv4or6; - hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; - hints.ai_socktype = SOCK_STREAM; - snprintf(strport, sizeof strport, "%d", port); - if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { - error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr)); - return -1; - } - for (ai = aitop; ai; ai = ai->ai_next) { - if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) - continue; - sock = socket(ai->ai_family, ai->ai_socktype, - ai->ai_protocol); - if (sock < 0) { - if ((errno != EINVAL) && (errno != EAFNOSUPPORT) -#ifdef EPFNOSUPPORT - && (errno != EPFNOSUPPORT) -#endif - ) { - error("socket: %.100s", strerror(errno)); - freeaddrinfo(aitop); - return -1; - } else { - debug("x11_create_display_inet: Socket family %d not supported", - ai->ai_family); - continue; - } - } - if (ai->ai_family == AF_INET6) - sock_set_v6only(sock); - if (x11_use_localhost) - channel_set_reuseaddr(sock); - if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { - debug2("bind port %d: %.100s", port, strerror(errno)); - close(sock); - - for (n = 0; n < num_socks; n++) { - close(socks[n]); - } - num_socks = 0; - break; - } - socks[num_socks++] = sock; - if (num_socks == NUM_SOCKS) - break; - } - freeaddrinfo(aitop); - if (num_socks > 0) - break; - } - if (display_number >= MAX_DISPLAYS) { - error("Failed to allocate internet-domain X11 display socket."); - return -1; - } - /* Start listening for connections on the socket. */ - for (n = 0; n < num_socks; n++) { - sock = socks[n]; - if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { - error("listen: %.100s", strerror(errno)); - close(sock); - return -1; - } - } - - /* Allocate a channel for each socket. */ - *chanids = xcalloc(num_socks + 1, sizeof(**chanids)); - for (n = 0; n < num_socks; n++) { - sock = socks[n]; - nc = channel_new("x11 listener", - SSH_CHANNEL_X11_LISTENER, sock, sock, -1, - CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, - 0, "X11 inet listener", 1); - nc->single_connection = single_connection; - (*chanids)[n] = nc->self; - } - (*chanids)[n] = -1; - - /* Return the display number for the DISPLAY environment variable. */ - *display_numberp = display_number; - return (0); -} - -static int -connect_local_xsocket_path(const char *pathname) -{ - int sock; - struct sockaddr_un addr; - - sock = socket(AF_UNIX, SOCK_STREAM, 0); - if (sock < 0) - error("socket: %.100s", strerror(errno)); - memset(&addr, 0, sizeof(addr)); - addr.sun_family = AF_UNIX; - strlcpy(addr.sun_path, pathname, sizeof addr.sun_path); - if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) - return sock; - close(sock); - error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); - return -1; -} - -static int -connect_local_xsocket(u_int dnr) -{ - char buf[1024]; - snprintf(buf, sizeof buf, _PATH_UNIX_X, dnr); - return connect_local_xsocket_path(buf); -} - -int -x11_connect_display(void) -{ - u_int display_number; - const char *display; - char buf[1024], *cp; - struct addrinfo hints, *ai, *aitop; - char strport[NI_MAXSERV]; - int gaierr, sock = 0; - - /* Try to open a socket for the local X server. */ - display = getenv("DISPLAY"); - if (!display) { - error("DISPLAY not set."); - return -1; - } - /* - * Now we decode the value of the DISPLAY variable and make a - * connection to the real X server. - */ - - /* Check if the display is from launchd. */ -#ifdef __APPLE__ - if (strncmp(display, "/tmp/launch", 11) == 0) { - sock = connect_local_xsocket_path(display); - if (sock < 0) - return -1; - - /* OK, we now have a connection to the display. */ - return sock; - } -#endif - /* - * Check if it is a unix domain socket. Unix domain displays are in - * one of the following formats: unix:d[.s], :d[.s], ::d[.s] - */ - if (strncmp(display, "unix:", 5) == 0 || - display[0] == ':') { - /* Connect to the unix domain socket. */ - if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) { - error("Could not parse display number from DISPLAY: %.100s", - display); - return -1; - } - /* Create a socket. */ - sock = connect_local_xsocket(display_number); - if (sock < 0) - return -1; - - /* OK, we now have a connection to the display. */ - return sock; - } - /* - * Connect to an inet socket. The DISPLAY value is supposedly - * hostname:d[.s], where hostname may also be numeric IP address. - */ - strlcpy(buf, display, sizeof(buf)); - cp = strchr(buf, ':'); - if (!cp) { - error("Could not find ':' in DISPLAY: %.100s", display); - return -1; - } - *cp = 0; - /* buf now contains the host name. But first we parse the display number. */ - if (sscanf(cp + 1, "%u", &display_number) != 1) { - error("Could not parse display number from DISPLAY: %.100s", - display); - return -1; - } - - /* Look up the host address */ - memset(&hints, 0, sizeof(hints)); - hints.ai_family = IPv4or6; - hints.ai_socktype = SOCK_STREAM; - snprintf(strport, sizeof strport, "%u", 6000 + display_number); - if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { - error("%.100s: unknown host. (%s)", buf, - ssh_gai_strerror(gaierr)); - return -1; - } - for (ai = aitop; ai; ai = ai->ai_next) { - /* Create a socket. */ - sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); - if (sock < 0) { - debug2("socket: %.100s", strerror(errno)); - continue; - } - /* Connect it to the display. */ - if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { - debug2("connect %.100s port %u: %.100s", buf, - 6000 + display_number, strerror(errno)); - close(sock); - continue; - } - /* Success */ - break; - } - freeaddrinfo(aitop); - if (!ai) { - error("connect %.100s port %u: %.100s", buf, 6000 + display_number, - strerror(errno)); - return -1; - } - set_nodelay(sock); - return sock; -} - -/* - * This is called when SSH_SMSG_X11_OPEN is received. The packet contains - * the remote channel number. We should do whatever we want, and respond - * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. - */ - -/* ARGSUSED */ -int -x11_input_open(int type, u_int32_t seq, void *ctxt) -{ - Channel *c = NULL; - int remote_id, sock = 0; - char *remote_host; - - debug("Received X11 open request."); - - remote_id = packet_get_int(); - - if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { - remote_host = packet_get_string(NULL); - } else { - remote_host = xstrdup("unknown (remote did not supply name)"); - } - packet_check_eom(); - - /* Obtain a connection to the real X display. */ - sock = x11_connect_display(); - if (sock != -1) { - /* Allocate a channel for this connection. */ - c = channel_new("connected x11 socket", - SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, - remote_host, 1); - c->remote_id = remote_id; - c->force_drain = 1; - } - free(remote_host); - if (c == NULL) { - /* Send refusal to the remote host. */ - packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); - packet_put_int(remote_id); - } else { - /* Send a confirmation to the remote host. */ - packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); - packet_put_int(remote_id); - packet_put_int(c->self); - } - packet_send(); - return 0; -} - -/* dummy protocol handler that denies SSH-1 requests (agent/x11) */ -/* ARGSUSED */ -int -deny_input_open(int type, u_int32_t seq, void *ctxt) -{ - int rchan = packet_get_int(); - - switch (type) { - case SSH_SMSG_AGENT_OPEN: - error("Warning: ssh server tried agent forwarding."); - break; - case SSH_SMSG_X11_OPEN: - error("Warning: ssh server tried X11 forwarding."); - break; - default: - error("deny_input_open: type %d", type); - break; - } - error("Warning: this is probably a break-in attempt by a malicious server."); - packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); - packet_put_int(rchan); - packet_send(); - return 0; -} - -/* - * Requests forwarding of X11 connections, generates fake authentication - * data, and enables authentication spoofing. - * This should be called in the client only. - */ -void -x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, - const char *proto, const char *data, int want_reply) -{ - u_int data_len = (u_int) strlen(data) / 2; - u_int i, value; - char *new_data; - int screen_number; - const char *cp; - - if (x11_saved_display == NULL) - x11_saved_display = xstrdup(disp); - else if (strcmp(disp, x11_saved_display) != 0) { - error("x11_request_forwarding_with_spoofing: different " - "$DISPLAY already forwarded"); - return; - } - - cp = strchr(disp, ':'); - if (cp) - cp = strchr(cp, '.'); - if (cp) - screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL); - else - screen_number = 0; - - if (x11_saved_proto == NULL) { - /* Save protocol name. */ - x11_saved_proto = xstrdup(proto); - - /* Extract real authentication data. */ - x11_saved_data = xmalloc(data_len); - for (i = 0; i < data_len; i++) { - if (sscanf(data + 2 * i, "%2x", &value) != 1) - fatal("x11_request_forwarding: bad " - "authentication data: %.100s", data); - x11_saved_data[i] = value; - } - x11_saved_data_len = data_len; - - /* Generate fake data of the same length. */ - x11_fake_data = xmalloc(data_len); - arc4random_buf(x11_fake_data, data_len); - x11_fake_data_len = data_len; - } - - /* Convert the fake data into hex. */ - new_data = tohex(x11_fake_data, data_len); - - /* Send the request packet. */ - if (compat20) { - channel_request_start(client_session_id, "x11-req", want_reply); - packet_put_char(0); /* XXX bool single connection */ - } else { - packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); - } - packet_put_cstring(proto); - packet_put_cstring(new_data); - packet_put_int(screen_number); - packet_send(); - packet_write_wait(); - free(new_data); -} - - -/* -- agent forwarding */ - -/* Sends a message to the server to request authentication fd forwarding. */ - -void -auth_request_forwarding(void) -{ - packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); - packet_send(); - packet_write_wait(); -} diff --git a/channels.c.rej b/channels.c.rej deleted file mode 100644 index b53ea3b3c..000000000 --- a/channels.c.rej +++ /dev/null @@ -1,8 +0,0 @@ ---- channels.c -+++ channels.c -@@ -1,4 +1,4 @@ --/* $OpenBSD: channels.c,v 1.355 2016/09/30 20:24:46 djm Exp $ */ -+/* $OpenBSD: channels.c,v 1.356 2016/10/18 17:32:54 dtucker Exp $ */ - /* - * Author: Tatu Ylonen - * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland diff --git a/channels.h.orig b/channels.h.orig deleted file mode 100644 index 95363e98a..000000000 --- a/channels.h.orig +++ /dev/null @@ -1,323 +0,0 @@ -/* $OpenBSD: channels.h,v 1.119 2016/09/30 09:19:13 markus Exp $ */ - -/* - * Author: Tatu Ylonen - * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland - * All rights reserved - * - * As far as I am concerned, the code I have written for this software - * can be used freely for any purpose. Any derived versions of this - * software must be clearly marked as such, and if the derived work is - * incompatible with the protocol description in the RFC file, it must be - * called by a name other than "ssh" or "Secure Shell". - */ -/* - * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. - * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF - * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#ifndef CHANNEL_H -#define CHANNEL_H - -/* Definitions for channel types. */ -#define SSH_CHANNEL_X11_LISTENER 1 /* Listening for inet X11 conn. */ -#define SSH_CHANNEL_PORT_LISTENER 2 /* Listening on a port. */ -#define SSH_CHANNEL_OPENING 3 /* waiting for confirmation */ -#define SSH_CHANNEL_OPEN 4 /* normal open two-way channel */ -#define SSH_CHANNEL_CLOSED 5 /* waiting for close confirmation */ -#define SSH_CHANNEL_AUTH_SOCKET 6 /* authentication socket */ -#define SSH_CHANNEL_X11_OPEN 7 /* reading first X11 packet */ -#define SSH_CHANNEL_INPUT_DRAINING 8 /* sending remaining data to conn */ -#define SSH_CHANNEL_OUTPUT_DRAINING 9 /* sending remaining data to app */ -#define SSH_CHANNEL_LARVAL 10 /* larval session */ -#define SSH_CHANNEL_RPORT_LISTENER 11 /* Listening to a R-style port */ -#define SSH_CHANNEL_CONNECTING 12 -#define SSH_CHANNEL_DYNAMIC 13 -#define SSH_CHANNEL_ZOMBIE 14 /* Almost dead. */ -#define SSH_CHANNEL_MUX_LISTENER 15 /* Listener for mux conn. */ -#define SSH_CHANNEL_MUX_CLIENT 16 /* Conn. to mux slave */ -#define SSH_CHANNEL_ABANDONED 17 /* Abandoned session, eg mux */ -#define SSH_CHANNEL_UNIX_LISTENER 18 /* Listening on a domain socket. */ -#define SSH_CHANNEL_RUNIX_LISTENER 19 /* Listening to a R-style domain socket. */ -#define SSH_CHANNEL_MUX_PROXY 20 /* proxy channel for mux-slave */ -#define SSH_CHANNEL_MAX_TYPE 21 - -#define CHANNEL_CANCEL_PORT_STATIC -1 - -struct Channel; -typedef struct Channel Channel; - -typedef void channel_open_fn(int, int, void *); -typedef void channel_callback_fn(int, void *); -typedef int channel_infilter_fn(struct Channel *, char *, int); -typedef void channel_filter_cleanup_fn(int, void *); -typedef u_char *channel_outfilter_fn(struct Channel *, u_char **, u_int *); - -/* Channel success/failure callbacks */ -typedef void channel_confirm_cb(int, struct Channel *, void *); -typedef void channel_confirm_abandon_cb(struct Channel *, void *); -struct channel_confirm { - TAILQ_ENTRY(channel_confirm) entry; - channel_confirm_cb *cb; - channel_confirm_abandon_cb *abandon_cb; - void *ctx; -}; -TAILQ_HEAD(channel_confirms, channel_confirm); - -/* Context for non-blocking connects */ -struct channel_connect { - char *host; - int port; - struct addrinfo *ai, *aitop; -}; - -/* Callbacks for mux channels back into client-specific code */ -typedef int mux_callback_fn(struct Channel *); - -struct Channel { - int type; /* channel type/state */ - int self; /* my own channel identifier */ - int remote_id; /* channel identifier for remote peer */ - u_int istate; /* input from channel (state of receive half) */ - u_int ostate; /* output to channel (state of transmit half) */ - int flags; /* close sent/rcvd */ - int rfd; /* read fd */ - int wfd; /* write fd */ - int efd; /* extended fd */ - int sock; /* sock fd */ - int ctl_chan; /* control channel (multiplexed connections) */ - int isatty; /* rfd is a tty */ -#ifdef _AIX - int wfd_isatty; /* wfd is a tty */ -#endif - int client_tty; /* (client) TTY has been requested */ - int force_drain; /* force close on iEOF */ - time_t notbefore; /* Pause IO until deadline (time_t) */ - int delayed; /* post-select handlers for newly created - * channels are delayed until the first call - * to a matching pre-select handler. - * this way post-select handlers are not - * accidentally called if a FD gets reused */ - Buffer input; /* data read from socket, to be sent over - * encrypted connection */ - Buffer output; /* data received over encrypted connection for - * send on socket */ - Buffer extended; - char *path; - /* path for unix domain sockets, or host name for forwards */ - int listening_port; /* port being listened for forwards */ - char *listening_addr; /* addr being listened for forwards */ - int host_port; /* remote port to connect for forwards */ - char *remote_name; /* remote hostname */ - - u_int remote_window; - u_int remote_maxpacket; - u_int local_window; - u_int local_window_max; - u_int local_consumed; - u_int local_maxpacket; - int extended_usage; - int single_connection; - - char *ctype; /* type */ - - /* callback */ - channel_open_fn *open_confirm; - void *open_confirm_ctx; - channel_callback_fn *detach_user; - int detach_close; - struct channel_confirms status_confirms; - - /* filter */ - channel_infilter_fn *input_filter; - channel_outfilter_fn *output_filter; - void *filter_ctx; - channel_filter_cleanup_fn *filter_cleanup; - - /* keep boundaries */ - int datagram; - - /* non-blocking connect */ - struct channel_connect connect_ctx; - - /* multiplexing protocol hook, called for each packet received */ - mux_callback_fn *mux_rcb; - void *mux_ctx; - int mux_pause; - int mux_downstream_id; -}; - -#define CHAN_EXTENDED_IGNORE 0 -#define CHAN_EXTENDED_READ 1 -#define CHAN_EXTENDED_WRITE 2 - -/* default window/packet sizes for tcp/x11-fwd-channel */ -#define CHAN_SES_PACKET_DEFAULT (32*1024) -#define CHAN_SES_WINDOW_DEFAULT (64*CHAN_SES_PACKET_DEFAULT) -#define CHAN_TCP_PACKET_DEFAULT (32*1024) -#define CHAN_TCP_WINDOW_DEFAULT (64*CHAN_TCP_PACKET_DEFAULT) -#define CHAN_X11_PACKET_DEFAULT (16*1024) -#define CHAN_X11_WINDOW_DEFAULT (4*CHAN_X11_PACKET_DEFAULT) - -/* possible input states */ -#define CHAN_INPUT_OPEN 0 -#define CHAN_INPUT_WAIT_DRAIN 1 -#define CHAN_INPUT_WAIT_OCLOSE 2 -#define CHAN_INPUT_CLOSED 3 - -/* possible output states */ -#define CHAN_OUTPUT_OPEN 0 -#define CHAN_OUTPUT_WAIT_DRAIN 1 -#define CHAN_OUTPUT_WAIT_IEOF 2 -#define CHAN_OUTPUT_CLOSED 3 - -#define CHAN_CLOSE_SENT 0x01 -#define CHAN_CLOSE_RCVD 0x02 -#define CHAN_EOF_SENT 0x04 -#define CHAN_EOF_RCVD 0x08 -#define CHAN_LOCAL 0x10 - -#define CHAN_RBUF 16*1024 - -/* check whether 'efd' is still in use */ -#define CHANNEL_EFD_INPUT_ACTIVE(c) \ - (compat20 && c->extended_usage == CHAN_EXTENDED_READ && \ - (c->efd != -1 || \ - buffer_len(&c->extended) > 0)) -#define CHANNEL_EFD_OUTPUT_ACTIVE(c) \ - (compat20 && c->extended_usage == CHAN_EXTENDED_WRITE && \ - c->efd != -1 && (!(c->flags & (CHAN_EOF_RCVD|CHAN_CLOSE_RCVD)) || \ - buffer_len(&c->extended) > 0)) - -/* channel management */ - -Channel *channel_by_id(int); -Channel *channel_by_remote_id(int); -Channel *channel_lookup(int); -Channel *channel_new(char *, int, int, int, int, u_int, u_int, int, char *, int); -void channel_set_fds(int, int, int, int, int, int, int, u_int); -void channel_free(Channel *); -void channel_free_all(void); -void channel_stop_listening(void); - -void channel_send_open(int); -void channel_request_start(int, char *, int); -void channel_register_cleanup(int, channel_callback_fn *, int); -void channel_register_open_confirm(int, channel_open_fn *, void *); -void channel_register_filter(int, channel_infilter_fn *, - channel_outfilter_fn *, channel_filter_cleanup_fn *, void *); -void channel_register_status_confirm(int, channel_confirm_cb *, - channel_confirm_abandon_cb *, void *); -void channel_cancel_cleanup(int); -int channel_close_fd(int *); -void channel_send_window_changes(void); - -/* mux proxy support */ - -int channel_proxy_downstream(Channel *mc); -int channel_proxy_upstream(Channel *, int, u_int32_t, void *); - -/* protocol handler */ - -int channel_input_close(int, u_int32_t, void *); -int channel_input_close_confirmation(int, u_int32_t, void *); -int channel_input_data(int, u_int32_t, void *); -int channel_input_extended_data(int, u_int32_t, void *); -int channel_input_ieof(int, u_int32_t, void *); -int channel_input_oclose(int, u_int32_t, void *); -int channel_input_open_confirmation(int, u_int32_t, void *); -int channel_input_open_failure(int, u_int32_t, void *); -int channel_input_port_open(int, u_int32_t, void *); -int channel_input_window_adjust(int, u_int32_t, void *); -int channel_input_status_confirm(int, u_int32_t, void *); - -/* file descriptor handling (read/write) */ - -void channel_prepare_select(fd_set **, fd_set **, int *, u_int*, - time_t*, int); -void channel_after_select(fd_set *, fd_set *); -void channel_output_poll(void); - -int channel_not_very_much_buffered_data(void); -void channel_close_all(void); -int channel_still_open(void); -char *channel_open_message(void); -int channel_find_open(void); - -/* tcp forwarding */ -struct Forward; -struct ForwardOptions; -void channel_set_af(int af); -void channel_permit_all_opens(void); -void channel_add_permitted_opens(char *, int); -int channel_add_adm_permitted_opens(char *, int); -void channel_disable_adm_local_opens(void); -void channel_update_permitted_opens(int, int); -void channel_clear_permitted_opens(void); -void channel_clear_adm_permitted_opens(void); -void channel_print_adm_permitted_opens(void); -int channel_input_port_forward_request(int, struct ForwardOptions *); -Channel *channel_connect_to_port(const char *, u_short, char *, char *); -Channel *channel_connect_to_path(const char *, char *, char *); -Channel *channel_connect_stdio_fwd(const char*, u_short, int, int); -Channel *channel_connect_by_listen_address(const char *, u_short, - char *, char *); -Channel *channel_connect_by_listen_path(const char *, char *, char *); -int channel_request_remote_forwarding(struct Forward *); -int channel_setup_local_fwd_listener(struct Forward *, struct ForwardOptions *); -int channel_request_rforward_cancel(struct Forward *); -int channel_setup_remote_fwd_listener(struct Forward *, int *, struct ForwardOptions *); -int channel_cancel_rport_listener(struct Forward *); -int channel_cancel_lport_listener(struct Forward *, int, struct ForwardOptions *); -int permitopen_port(const char *); - -/* x11 forwarding */ - -void channel_set_x11_refuse_time(u_int); -int x11_connect_display(void); -int x11_create_display_inet(int, int, int, u_int *, int **); -int x11_input_open(int, u_int32_t, void *); -void x11_request_forwarding_with_spoofing(int, const char *, const char *, - const char *, int); -int deny_input_open(int, u_int32_t, void *); - -/* agent forwarding */ - -void auth_request_forwarding(void); - -/* channel close */ - -int chan_is_dead(Channel *, int); -void chan_mark_dead(Channel *); - -/* channel events */ - -void chan_rcvd_oclose(Channel *); -void chan_rcvd_eow(Channel *); /* SSH2-only */ -void chan_read_failed(Channel *); -void chan_ibuf_empty(Channel *); - -void chan_rcvd_ieof(Channel *); -void chan_write_failed(Channel *); -void chan_obuf_empty(Channel *); - -#endif diff --git a/channels.h.rej b/channels.h.rej deleted file mode 100644 index 6e08ec640..000000000 --- a/channels.h.rej +++ /dev/null @@ -1,16 +0,0 @@ ---- channels.h -+++ channels.h -@@ -1,4 +1,4 @@ --/* $OpenBSD: channels.h,v 1.119 2016/09/30 09:19:13 markus Exp $ */ -+/* $OpenBSD: channels.h,v 1.120 2016/10/18 17:32:54 dtucker Exp $ */ - - /* - * Author: Tatu Ylonen -@@ -272,7 +272,6 @@ void channel_update_permitted_opens(int, int); - void channel_clear_permitted_opens(void); - void channel_clear_adm_permitted_opens(void); - void channel_print_adm_permitted_opens(void); --int channel_input_port_forward_request(int, struct ForwardOptions *); - Channel *channel_connect_to_port(const char *, u_short, char *, char *); - Channel *channel_connect_to_path(const char *, char *, char *); - Channel *channel_connect_stdio_fwd(const char*, u_short, int, int); -- cgit v1.2.3