upstream: convert sshd.c to new packet API

with & ok markus@

OpenBSD-Commit-ID: ea569d3eaf9b5cf1bad52779fbfa5fa0b28af891

1 files changed, 39 insertions, 30 deletions

diff --git a/sshd.c b/sshd.c
index c2cd5b068..9dbb09c6d 100644
--- a/sshd.c
+++ b/sshd.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: sshd.c,v 1.524 2019/01/19 21:38:24 djm Exp $ */
+/* $OpenBSD: sshd.c,v 1.525 2019/01/19 21:42:30 djm Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -123,7 +123,6 @@
 #include "version.h"
 #include "ssherr.h"
 
-#include "opacket.h" /* XXX */
 extern struct ssh *active_state; /* XXX move decl to this file */
 
 /* Re-exec fds */
@@ -244,7 +243,7 @@ struct passwd *privsep_pw = NULL;
 /* Prototypes for various functions defined later in this file. */
 void destroy_sensitive_data(void);
 void demote_sensitive_data(void);
-static void do_ssh2_kex(void);
+static void do_ssh2_kex(struct ssh *);
 
 /*
  * Close all listening sockets
@@ -458,8 +457,9 @@ privsep_preauth_child(void)
 }
 
 static int
-privsep_preauth(Authctxt *authctxt)
+privsep_preauth(struct ssh *ssh)
 {
+        Authctxt *authctxt = (Authctxt *)ssh->authctxt;
         int status, r;
         pid_t pid;
         struct ssh_sandbox *box = NULL;
@@ -467,7 +467,7 @@ privsep_preauth(Authctxt *authctxt)
         /* Set up unprivileged child process to deal with network data */
         pmonitor = monitor_init();
         /* Store a pointer to the kex for later rekeying */
-        pmonitor->m_pkex = &active_state->kex;
+        pmonitor->m_pkex = &ssh->kex;
 
         if (use_privsep == PRIVSEP_ON)
                 box = ssh_sandbox_init(pmonitor);
@@ -527,7 +527,7 @@ privsep_preauth(Authctxt *authctxt)
 }
 
 static void
-privsep_postauth(Authctxt *authctxt)
+privsep_postauth(struct ssh *ssh, Authctxt *authctxt)
 {
 #ifdef DISABLE_FD_PASSING
         if (1) {
@@ -576,7 +576,7 @@ privsep_postauth(Authctxt *authctxt)
          * Tell the packet layer that authentication was successful, since
          * this information is not part of the key state.
          */
-        packet_set_authenticated();
+        ssh_packet_set_authenticated(ssh);
 }
 
 static void
@@ -759,21 +759,29 @@ notify_hostkeys(struct ssh *ssh)
                     sshkey_ssh_name(key), fp);
                 free(fp);
                 if (nkeys == 0) {
-                        packet_start(SSH2_MSG_GLOBAL_REQUEST);
-                        packet_put_cstring("hostkeys-00@openssh.com");
-                        packet_put_char(0); /* want-reply */
+                        /*
+                         * Start building the request when we find the
+                         * first usable key.
+                         */
+                        if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
+                            (r = sshpkt_put_cstring(ssh, "hostkeys-00@openssh.com")) != 0 ||
+                            (r = sshpkt_put_u8(ssh, 0)) != 0) /* want reply */
+                                sshpkt_fatal(ssh, r, "%s: start request", __func__);
                 }
+                /* Append the key to the request */
                 sshbuf_reset(buf);
                 if ((r = sshkey_putb(key, buf)) != 0)
                         fatal("%s: couldn't put hostkey %d: %s",
                             __func__, i, ssh_err(r));
-                packet_put_string(sshbuf_ptr(buf), sshbuf_len(buf));
+                if ((r = sshpkt_put_stringb(ssh, buf)) != 0)
+                        sshpkt_fatal(ssh, r, "%s: append key", __func__);
                 nkeys++;
         }
         debug3("%s: sent %u hostkeys", __func__, nkeys);
         if (nkeys == 0)
                 fatal("%s: no hostkeys", __func__);
-        packet_send();
+        if ((r = sshpkt_send(ssh)) != 0)
+                sshpkt_fatal(ssh, r, "%s: send", __func__);
         sshbuf_free(buf);
 }
 
@@ -1951,9 +1959,10 @@ main(int ac, char **av)
          * Register our connection.  This turns encryption off because we do
          * not have a key.
          */
-        packet_set_connection(sock_in, sock_out);
-        packet_set_server();
-        ssh = active_state; /* XXX */
+        if ((ssh = ssh_packet_set_connection(NULL, sock_in, sock_out)) == NULL)
+                fatal("Unable to create connection");
+        ssh_packet_set_server(ssh);
+        active_state = ssh; /* XXX needed elsewhere */
 
         check_ip_options(ssh);
 
@@ -1963,7 +1972,7 @@ main(int ac, char **av)
         process_permitopen(ssh, &options);
 
         /* Set SO_KEEPALIVE if requested. */
-        if (options.tcp_keep_alive && packet_connection_is_on_socket() &&
+        if (options.tcp_keep_alive && ssh_packet_connection_is_on_socket(ssh) &&
             setsockopt(sock_in, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(on)) < 0)
                 error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno));
 
@@ -2012,10 +2021,11 @@ main(int ac, char **av)
         if (kex_exchange_identification(ssh, -1, options.version_addendum) != 0)
                 cleanup_exit(255); /* error already logged */
 
-        packet_set_nonblocking();
+        ssh_packet_set_nonblocking(ssh);
 
         /* allocate authentication context */
         authctxt = xcalloc(1, sizeof(*authctxt));
+        ssh->authctxt = authctxt;
 
         authctxt->loginmsg = loginmsg;
 
@@ -2032,7 +2042,7 @@ main(int ac, char **av)
         auth_debug_reset();
 
         if (use_privsep) {
-                if (privsep_preauth(authctxt) == 1)
+                if (privsep_preauth(ssh) == 1)
                         goto authenticated;
         } else if (have_agent) {
                 if ((r = ssh_get_authentication_socket(&auth_sock)) != 0) {
@@ -2043,8 +2053,7 @@ main(int ac, char **av)
 
         /* perform the key exchange */
         /* authenticate user and start session */
-        do_ssh2_kex();
-        ssh->authctxt = authctxt;
+        do_ssh2_kex(ssh);
         do_authentication2(ssh);
 
         /*
@@ -2053,7 +2062,7 @@ main(int ac, char **av)
          */
         if (use_privsep) {
                 mm_send_keystate(pmonitor);
-                packet_clear_keys();
+                ssh_packet_clear_keys(ssh);
                 exit(0);
         }
 
@@ -2093,11 +2102,11 @@ main(int ac, char **av)
          * file descriptor passing.
          */
         if (use_privsep) {
-                privsep_postauth(authctxt);
+                privsep_postauth(ssh, authctxt);
                 /* the monitor process [priv] will not return */
         }
 
-        packet_set_timeout(options.client_alive_interval,
+        ssh_packet_set_timeout(ssh, options.client_alive_interval,
             options.client_alive_count_max);
 
         /* Try to send all our hostkeys to the client */
@@ -2107,7 +2116,7 @@ main(int ac, char **av)
         do_authenticated(ssh, authctxt);
 
         /* The connection has been terminated. */
-        packet_get_bytes(&ibytes, &obytes);
+        ssh_packet_get_bytes(ssh, &ibytes, &obytes);
         verbose("Transferred: sent %llu, received %llu bytes",
             (unsigned long long)obytes, (unsigned long long)ibytes);
 
@@ -2122,7 +2131,7 @@ main(int ac, char **av)
         PRIVSEP(audit_event(SSH_CONNECTION_CLOSE));
 #endif
 
-        packet_close();
+        ssh_packet_close(ssh);
 
         if (use_privsep)
                 mm_terminate();
@@ -2156,7 +2165,7 @@ sshd_hostkey_sign(struct sshkey *privkey, struct sshkey *pubkey,
 
 /* SSH2 key exchange */
 static void
-do_ssh2_kex(void)
+do_ssh2_kex(struct ssh *ssh)
 {
         char *myproposal[PROPOSAL_MAX] = { KEX_SERVER };
         struct kex *kex;
@@ -2177,16 +2186,16 @@ do_ssh2_kex(void)
         }
 
         if (options.rekey_limit || options.rekey_interval)
-                packet_set_rekey_limits(options.rekey_limit,
+                ssh_packet_set_rekey_limits(ssh, options.rekey_limit,
                     options.rekey_interval);
 
         myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = compat_pkalg_proposal(
             list_hostkey_types());
 
         /* start key exchange */
-        if ((r = kex_setup(active_state, myproposal)) != 0)
+        if ((r = kex_setup(ssh, myproposal)) != 0)
                 fatal("kex_setup: %s", ssh_err(r));
-        kex = active_state->kex;
+        kex = ssh->kex;
 #ifdef WITH_OPENSSL
         kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
         kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
@@ -2205,7 +2214,7 @@ do_ssh2_kex(void)
         kex->host_key_index=&get_hostkey_index;
         kex->sign = sshd_hostkey_sign;
 
-        ssh_dispatch_run_fatal(active_state, DISPATCH_BLOCK, &kex->done);
+        ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &kex->done);
 
         session_id2 = kex->session_id;
         session_id2_len = kex->session_id_len;