New upstream release (7.6p1)

1 files changed, 185 insertions, 192 deletions

diff --git a/session.c b/session.c
index ea3871eb8..d40afe4f7 100644
--- a/session.c
+++ b/session.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: session.c,v 1.286 2016/11/30 03:00:05 djm Exp $ */
+/* $OpenBSD: session.c,v 1.292 2017/09/12 06:32:07 djm Exp $ */
 /*
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
  *                    All rights reserved
@@ -94,6 +94,7 @@
 #include "kex.h"
 #include "monitor_wrap.h"
 #include "sftp.h"
+#include "atomicio.h"
 
 #if defined(KRB5) && defined(USE_AFS)
 #include <kafs.h>
@@ -112,29 +113,28 @@
 /* func */
 
 Session *session_new(void);
-void    session_set_fds(Session *, int, int, int, int, int);
+void    session_set_fds(struct ssh *, Session *, int, int, int, int, int);
 void    session_pty_cleanup(Session *);
 void    session_proctitle(Session *);
-int     session_setup_x11fwd(Session *);
-int     do_exec_pty(Session *, const char *);
-int     do_exec_no_pty(Session *, const char *);
-int     do_exec(Session *, const char *);
-void    do_login(Session *, const char *);
+int     session_setup_x11fwd(struct ssh *, Session *);
+int     do_exec_pty(struct ssh *, Session *, const char *);
+int     do_exec_no_pty(struct ssh *, Session *, const char *);
+int     do_exec(struct ssh *, Session *, const char *);
+void    do_login(struct ssh *, Session *, const char *);
+void    do_child(struct ssh *, Session *, const char *);
 #ifdef LOGIN_NEEDS_UTMPX
 static void     do_pre_login(Session *s);
 #endif
-void    do_child(Session *, const char *);
 void    do_motd(void);
 int     check_quietlogin(Session *, const char *);
 
-static void do_authenticated2(Authctxt *);
+static void do_authenticated2(struct ssh *, Authctxt *);
 
-static int session_pty_req(Session *);
+static int session_pty_req(struct ssh *, Session *);
 
 /* import */
 extern ServerOptions options;
 extern char *__progname;
-extern int log_stderr;
 extern int debug_flag;
 extern u_int utmp_len;
 extern int startup_pipe;
@@ -161,6 +161,9 @@ login_cap_t *lc;
 static int is_child = 0;
 static int in_chroot = 0;
 
+/* File containing userauth info, if ExposeAuthInfo set */
+static char *auth_info_file = NULL;
+
 /* Name and directory of socket for authentication agent forwarding. */
 static char *auth_sock_name = NULL;
 static char *auth_sock_dir = NULL;
@@ -180,7 +183,7 @@ auth_sock_cleanup_proc(struct passwd *pw)
 }
 
 static int
-auth_input_request_forwarding(struct passwd * pw)
+auth_input_request_forwarding(struct ssh *ssh, struct passwd * pw)
 {
         Channel *nc;
         int sock = -1;
@@ -220,7 +223,7 @@ auth_input_request_forwarding(struct passwd * pw)
                 goto authsock_err;
 
         /* Allocate a channel for the authentication agent socket. */
-        nc = channel_new("auth socket",
+        nc = channel_new(ssh, "auth socket",
             SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
             CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
             0, "auth socket", 1);
@@ -250,8 +253,42 @@ display_loginmsg(void)
         }
 }
 
+static void
+prepare_auth_info_file(struct passwd *pw, struct sshbuf *info)
+{
+        int fd = -1, success = 0;
+
+        if (!options.expose_userauth_info || info == NULL)
+                return;
+
+        temporarily_use_uid(pw);
+        auth_info_file = xstrdup("/tmp/sshauth.XXXXXXXXXXXXXXX");
+        if ((fd = mkstemp(auth_info_file)) == -1) {
+                error("%s: mkstemp: %s", __func__, strerror(errno));
+                goto out;
+        }
+        if (atomicio(vwrite, fd, sshbuf_mutable_ptr(info),
+            sshbuf_len(info)) != sshbuf_len(info)) {
+                error("%s: write: %s", __func__, strerror(errno));
+                goto out;
+        }
+        if (close(fd) != 0) {
+                error("%s: close: %s", __func__, strerror(errno));
+                goto out;
+        }
+        success = 1;
+ out:
+        if (!success) {
+                if (fd != -1)
+                        close(fd);
+                free(auth_info_file);
+                auth_info_file = NULL;
+        }
+        restore_uid();
+}
+
 void
-do_authenticated(Authctxt *authctxt)
+do_authenticated(struct ssh *ssh, Authctxt *authctxt)
 {
         setproctitle("%s", authctxt->pw->pw_name);
 
@@ -259,14 +296,17 @@ do_authenticated(Authctxt *authctxt)
         /* XXX - streamlocal? */
         if (no_port_forwarding_flag || options.disable_forwarding ||
             (options.allow_tcp_forwarding & FORWARD_LOCAL) == 0)
-                channel_disable_adm_local_opens();
+                channel_disable_adm_local_opens(ssh);
         else
-                channel_permit_all_opens();
+                channel_permit_all_opens(ssh);
 
         auth_debug_send();
 
-        do_authenticated2(authctxt);
-        do_cleanup(authctxt);
+        prepare_auth_info_file(authctxt->pw, authctxt->session_info);
+
+        do_authenticated2(ssh, authctxt);
+
+        do_cleanup(ssh, authctxt);
 }
 
 /* Check untrusted xauth strings for metacharacters */
@@ -291,7 +331,7 @@ xauth_valid_string(const char *s)
  * setting up file descriptors and such.
  */
 int
-do_exec_no_pty(Session *s, const char *command)
+do_exec_no_pty(struct ssh *ssh, Session *s, const char *command)
 {
         pid_t pid;
 
@@ -364,10 +404,6 @@ do_exec_no_pty(Session *s, const char *command)
         case 0:
                 is_child = 1;
 
-                /* Child.  Reinitialize the log since the pid has changed. */
-                log_init(__progname, options.log_level,
-                    options.log_facility, log_stderr);
-
                 /*
                  * Create a new session and process group since the 4.4BSD
                  * setlogin() affects the entire process group.
@@ -420,7 +456,7 @@ do_exec_no_pty(Session *s, const char *command)
 #endif
 
                 /* Do processing for the child (exec command etc). */
-                do_child(s, command);
+                do_child(ssh, s, command);
                 /* NOTREACHED */
         default:
                 break;
@@ -451,7 +487,7 @@ do_exec_no_pty(Session *s, const char *command)
         close(pout[1]);
         close(perr[1]);
 
-        session_set_fds(s, pin[1], pout[0], perr[0],
+        session_set_fds(ssh, s, pin[1], pout[0], perr[0],
             s->is_subsystem, 0);
 #else
         /* We are the parent.  Close the child sides of the socket pairs. */
@@ -475,7 +511,7 @@ do_exec_no_pty(Session *s, const char *command)
  * lastlog, and other such operations.
  */
 int
-do_exec_pty(Session *s, const char *command)
+do_exec_pty(struct ssh *ssh, Session *s, const char *command)
 {
         int fdout, ptyfd, ttyfd, ptymaster;
         pid_t pid;
@@ -522,9 +558,6 @@ do_exec_pty(Session *s, const char *command)
                 close(fdout);
                 close(ptymaster);
 
-                /* Child.  Reinitialize the log because the pid has changed. */
-                log_init(__progname, options.log_level,
-                    options.log_facility, log_stderr);
                 /* Close the master side of the pseudo tty. */
                 close(ptyfd);
 
@@ -547,13 +580,13 @@ do_exec_pty(Session *s, const char *command)
                 cray_init_job(s->pw); /* set up cray jid and tmpdir */
 #endif /* _UNICOS */
 #ifndef HAVE_OSF_SIA
-                do_login(s, command);
+                do_login(ssh, s, command);
 #endif
                 /*
                  * Do common processing for the child, such as execing
                  * the command.
                  */
-                do_child(s, command);
+                do_child(ssh, s, command);
                 /* NOTREACHED */
         default:
                 break;
@@ -575,7 +608,7 @@ do_exec_pty(Session *s, const char *command)
         s->ptymaster = ptymaster;
         packet_set_interactive(1, 
             options.ip_qos_interactive, options.ip_qos_bulk);
-        session_set_fds(s, ptyfd, fdout, -1, 1, 1);
+        session_set_fds(ssh, s, ptyfd, fdout, -1, 1, 1);
         return 0;
 }
 
@@ -613,9 +646,8 @@ do_pre_login(Session *s)
  * to be forced, execute that instead.
  */
 int
-do_exec(Session *s, const char *command)
+do_exec(struct ssh *ssh, Session *s, const char *command)
 {
-        struct ssh *ssh = active_state; /* XXX */
         int ret;
         const char *forced = NULL, *tty = NULL;
         char session_type[1024];
@@ -674,9 +706,9 @@ do_exec(Session *s, const char *command)
         }
 #endif
         if (s->ttyfd != -1)
-                ret = do_exec_pty(s, command);
+                ret = do_exec_pty(ssh, s, command);
         else
-                ret = do_exec_no_pty(s, command);
+                ret = do_exec_no_pty(ssh, s, command);
 
         original_command = NULL;
 
@@ -692,9 +724,8 @@ do_exec(Session *s, const char *command)
 
 /* administrative, login(1)-like work */
 void
-do_login(Session *s, const char *command)
+do_login(struct ssh *ssh, Session *s, const char *command)
 {
-        struct ssh *ssh = active_state; /* XXX */
         socklen_t fromlen;
         struct sockaddr_storage from;
         struct passwd * pw = s->pw;
@@ -792,65 +823,6 @@ check_quietlogin(Session *s, const char *command)
 }
 
 /*
- * Sets the value of the given variable in the environment.  If the variable
- * already exists, its value is overridden.
- */
-void
-child_set_env(char ***envp, u_int *envsizep, const char *name,
-        const char *value)
-{
-        char **env;
-        u_int envsize;
-        u_int i, namelen;
-
-        if (strchr(name, '=') != NULL) {
-                error("Invalid environment variable \"%.100s\"", name);
-                return;
-        }
-
-        /*
-         * If we're passed an uninitialized list, allocate a single null
-         * entry before continuing.
-         */
-        if (*envp == NULL && *envsizep == 0) {
-                *envp = xmalloc(sizeof(char *));
-                *envp[0] = NULL;
-                *envsizep = 1;
-        }
-
-        /*
-         * Find the slot where the value should be stored.  If the variable
-         * already exists, we reuse the slot; otherwise we append a new slot
-         * at the end of the array, expanding if necessary.
-         */
-        env = *envp;
-        namelen = strlen(name);
-        for (i = 0; env[i]; i++)
-                if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
-                        break;
-        if (env[i]) {
-                /* Reuse the slot. */
-                free(env[i]);
-        } else {
-                /* New variable.  Expand if necessary. */
-                envsize = *envsizep;
-                if (i >= envsize - 1) {
-                        if (envsize >= 1000)
-                                fatal("child_set_env: too many env vars");
-                        envsize += 50;
-                        env = (*envp) = xreallocarray(env, envsize, sizeof(char *));
-                        *envsizep = envsize;
-                }
-                /* Need to set the NULL pointer at end of array beyond the new slot. */
-                env[i + 1] = NULL;
-        }
-
-        /* Allocate space and format the variable in the appropriate slot. */
-        env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
-        snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
-}
-
-/*
  * Reads environment variables from the given file and adds/overrides them
  * into the environment.  If the file does not exist, this does nothing.
  * Otherwise, it must consist of empty lines, comments (line starts with '#')
@@ -951,8 +923,9 @@ read_etc_default_login(char ***env, u_int *envsize, uid_t uid)
 }
 #endif /* HAVE_ETC_DEFAULT_LOGIN */
 
-void
-copy_environment(char **source, char ***env, u_int *envsize)
+static void
+copy_environment_blacklist(char **source, char ***env, u_int *envsize,
+    const char *blacklist)
 {
         char *var_name, *var_val;
         int i;
@@ -968,17 +941,25 @@ copy_environment(char **source, char ***env, u_int *envsize)
                 }
                 *var_val++ = '\0';
 
-                debug3("Copy environment: %s=%s", var_name, var_val);
-                child_set_env(env, envsize, var_name, var_val);
+                if (blacklist == NULL ||
+                    match_pattern_list(var_name, blacklist, 0) != 1) {
+                        debug3("Copy environment: %s=%s", var_name, var_val);
+                        child_set_env(env, envsize, var_name, var_val);
+                }
 
                 free(var_name);
         }
 }
 
+void
+copy_environment(char **source, char ***env, u_int *envsize)
+{
+        copy_environment_blacklist(source, env, envsize, NULL);
+}
+
 static char **
-do_setup_env(Session *s, const char *shell)
+do_setup_env(struct ssh *ssh, Session *s, const char *shell)
 {
-        struct ssh *ssh = active_state; /* XXX */
         char buf[256];
         u_int i, envsize;
         char **env, *laddr;
@@ -1085,6 +1066,8 @@ do_setup_env(Session *s, const char *shell)
         free(laddr);
         child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
 
+        if (auth_info_file != NULL)
+                child_set_env(&env, &envsize, "SSH_USER_AUTH", auth_info_file);
         if (s->ttyfd != -1)
                 child_set_env(&env, &envsize, "SSH_TTY", s->tty);
         if (s->term)
@@ -1134,12 +1117,16 @@ do_setup_env(Session *s, const char *shell)
         if (options.use_pam) {
                 char **p;
 
+                /*
+                 * Don't allow SSH_AUTH_INFO variables posted to PAM to leak
+                 * back into the environment.
+                 */
                 p = fetch_pam_child_environment();
-                copy_environment(p, &env, &envsize);
+                copy_environment_blacklist(p, &env, &envsize, "SSH_AUTH_INFO*");
                 free_pam_environment(p);
 
                 p = fetch_pam_environment();
-                copy_environment(p, &env, &envsize);
+                copy_environment_blacklist(p, &env, &envsize, "SSH_AUTH_INFO*");
                 free_pam_environment(p);
         }
 #endif /* USE_PAM */
@@ -1431,7 +1418,7 @@ do_pwchange(Session *s)
 }
 
 static void
-child_close_fds(void)
+child_close_fds(struct ssh *ssh)
 {
         extern int auth_sock;
 
@@ -1451,7 +1438,7 @@ child_close_fds(void)
          * open in the parent.
          */
         /* XXX better use close-on-exec? -markus */
-        channel_close_all();
+        channel_close_all(ssh);
 
         /*
          * Close any extra file descriptors.  Note that there may still be
@@ -1475,7 +1462,7 @@ child_close_fds(void)
  */
 #define ARGV_MAX 10
 void
-do_child(Session *s, const char *command)
+do_child(struct ssh *ssh, Session *s, const char *command)
 {
         extern char **environ;
         char **env;
@@ -1486,11 +1473,12 @@ do_child(Session *s, const char *command)
 
         /* remove hostkey from the child's memory */
         destroy_sensitive_data();
+        packet_clear_keys();
 
         /* Force a password change */
         if (s->authctxt->force_pwchange) {
                 do_setusercontext(pw, s->authctxt->role);
-                child_close_fds();
+                child_close_fds(ssh);
                 do_pwchange(s);
                 exit(1);
         }
@@ -1539,7 +1527,7 @@ do_child(Session *s, const char *command)
          * Make sure $SHELL points to the shell from the password file,
          * even if shell is overridden from login.conf
          */
-        env = do_setup_env(s, shell);
+        env = do_setup_env(ssh, s, shell);
 
 #ifdef HAVE_LOGIN_CAP
         shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
@@ -1552,7 +1540,7 @@ do_child(Session *s, const char *command)
          * closed before building the environment, as we call
          * ssh_remote_ipaddr there.
          */
-        child_close_fds();
+        child_close_fds(ssh);
 
         /*
          * Must take new environment into use so that .ssh/rc,
@@ -1710,8 +1698,8 @@ session_new(void)
                         return NULL;
                 debug2("%s: allocate (allocated %d max %d)",
                     __func__, sessions_nalloc, options.max_sessions);
-                tmp = xreallocarray(sessions, sessions_nalloc + 1,
-                    sizeof(*sessions));
+                tmp = xrecallocarray(sessions, sessions_nalloc,
+                    sessions_nalloc + 1, sizeof(*sessions));
                 if (tmp == NULL) {
                         error("%s: cannot allocate %d sessions",
                             __func__, sessions_nalloc + 1);
@@ -1849,7 +1837,7 @@ session_by_pid(pid_t pid)
 }
 
 static int
-session_window_change_req(Session *s)
+session_window_change_req(struct ssh *ssh, Session *s)
 {
         s->col = packet_get_int();
         s->row = packet_get_int();
@@ -1861,7 +1849,7 @@ session_window_change_req(Session *s)
 }
 
 static int
-session_pty_req(Session *s)
+session_pty_req(struct ssh *ssh, Session *s)
 {
         u_int len;
         int n_bytes;
@@ -1914,7 +1902,7 @@ session_pty_req(Session *s)
 }
 
 static int
-session_subsystem_req(Session *s)
+session_subsystem_req(struct ssh *ssh, Session *s)
 {
         struct stat st;
         u_int len;
@@ -1941,7 +1929,7 @@ session_subsystem_req(Session *s)
                                 s->is_subsystem = SUBSYSTEM_EXT;
                                 debug("subsystem: exec() %s", cmd);
                         }
-                        success = do_exec(s, cmd) == 0;
+                        success = do_exec(ssh, s, cmd) == 0;
                         break;
                 }
         }
@@ -1954,7 +1942,7 @@ session_subsystem_req(Session *s)
 }
 
 static int
-session_x11_req(Session *s)
+session_x11_req(struct ssh *ssh, Session *s)
 {
         int success;
 
@@ -1971,7 +1959,7 @@ session_x11_req(Session *s)
 
         if (xauth_valid_string(s->auth_proto) &&
             xauth_valid_string(s->auth_data))
-                success = session_setup_x11fwd(s);
+                success = session_setup_x11fwd(ssh, s);
         else {
                 success = 0;
                 error("Invalid X11 forwarding data");
@@ -1986,26 +1974,26 @@ session_x11_req(Session *s)
 }
 
 static int
-session_shell_req(Session *s)
+session_shell_req(struct ssh *ssh, Session *s)
 {
         packet_check_eom();
-        return do_exec(s, NULL) == 0;
+        return do_exec(ssh, s, NULL) == 0;
 }
 
 static int
-session_exec_req(Session *s)
+session_exec_req(struct ssh *ssh, Session *s)
 {
         u_int len, success;
 
         char *command = packet_get_string(&len);
         packet_check_eom();
-        success = do_exec(s, command) == 0;
+        success = do_exec(ssh, s, command) == 0;
         free(command);
         return success;
 }
 
 static int
-session_break_req(Session *s)
+session_break_req(struct ssh *ssh, Session *s)
 {
 
         packet_get_int();       /* ignored */
@@ -2017,7 +2005,7 @@ session_break_req(Session *s)
 }
 
 static int
-session_env_req(Session *s)
+session_env_req(struct ssh *ssh, Session *s)
 {
         char *name, *val;
         u_int name_len, val_len, i;
@@ -2035,8 +2023,8 @@ session_env_req(Session *s)
         for (i = 0; i < options.num_accept_env; i++) {
                 if (match_pattern(name, options.accept_env[i])) {
                         debug2("Setting env %d: %s=%s", s->num_env, name, val);
-                        s->env = xreallocarray(s->env, s->num_env + 1,
-                            sizeof(*s->env));
+                        s->env = xrecallocarray(s->env, s->num_env,
+                            s->num_env + 1, sizeof(*s->env));
                         s->env[s->num_env].name = name;
                         s->env[s->num_env].val = val;
                         s->num_env++;
@@ -2052,7 +2040,7 @@ session_env_req(Session *s)
 }
 
 static int
-session_auth_agent_req(Session *s)
+session_auth_agent_req(struct ssh *ssh, Session *s)
 {
         static int called = 0;
         packet_check_eom();
@@ -2064,22 +2052,21 @@ session_auth_agent_req(Session *s)
                 return 0;
         } else {
                 called = 1;
-                return auth_input_request_forwarding(s->pw);
+                return auth_input_request_forwarding(ssh, s->pw);
         }
 }
 
 int
-session_input_channel_req(Channel *c, const char *rtype)
+session_input_channel_req(struct ssh *ssh, Channel *c, const char *rtype)
 {
         int success = 0;
         Session *s;
 
         if ((s = session_by_channel(c->self)) == NULL) {
-                logit("session_input_channel_req: no session %d req %.100s",
-                    c->self, rtype);
+                logit("%s: no session %d req %.100s", __func__, c->self, rtype);
                 return 0;
         }
-        debug("session_input_channel_req: session %d req %s", s->self, rtype);
+        debug("%s: session %d req %s", __func__, s->self, rtype);
 
         /*
          * a session is in LARVAL state until a shell, a command
@@ -2087,33 +2074,33 @@ session_input_channel_req(Channel *c, const char *rtype)
          */
         if (c->type == SSH_CHANNEL_LARVAL) {
                 if (strcmp(rtype, "shell") == 0) {
-                        success = session_shell_req(s);
+                        success = session_shell_req(ssh, s);
                 } else if (strcmp(rtype, "exec") == 0) {
-                        success = session_exec_req(s);
+                        success = session_exec_req(ssh, s);
                 } else if (strcmp(rtype, "pty-req") == 0) {
-                        success = session_pty_req(s);
+                        success = session_pty_req(ssh, s);
                 } else if (strcmp(rtype, "x11-req") == 0) {
-                        success = session_x11_req(s);
+                        success = session_x11_req(ssh, s);
                 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
-                        success = session_auth_agent_req(s);
+                        success = session_auth_agent_req(ssh, s);
                 } else if (strcmp(rtype, "subsystem") == 0) {
-                        success = session_subsystem_req(s);
+                        success = session_subsystem_req(ssh, s);
                 } else if (strcmp(rtype, "env") == 0) {
-                        success = session_env_req(s);
+                        success = session_env_req(ssh, s);
                 }
         }
         if (strcmp(rtype, "window-change") == 0) {
-                success = session_window_change_req(s);
+                success = session_window_change_req(ssh, s);
         } else if (strcmp(rtype, "break") == 0) {
-                success = session_break_req(s);
+                success = session_break_req(ssh, s);
         }
 
         return success;
 }
 
 void
-session_set_fds(Session *s, int fdin, int fdout, int fderr, int ignore_fderr,
-    int is_tty)
+session_set_fds(struct ssh *ssh, Session *s,
+    int fdin, int fdout, int fderr, int ignore_fderr, int is_tty)
 {
         /*
          * now that have a child and a pipe to the child,
@@ -2121,7 +2108,7 @@ session_set_fds(Session *s, int fdin, int fdout, int fderr, int ignore_fderr,
          */
         if (s->chanid == -1)
                 fatal("no channel for session %d", s->self);
-        channel_set_fds(s->chanid,
+        channel_set_fds(ssh, s->chanid,
             fdout, fdin, fderr,
             ignore_fderr ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
             1, is_tty, CHAN_SES_WINDOW_DEFAULT);
@@ -2192,40 +2179,40 @@ sig2name(int sig)
 }
 
 static void
-session_close_x11(int id)
+session_close_x11(struct ssh *ssh, int id)
 {
         Channel *c;
 
-        if ((c = channel_by_id(id)) == NULL) {
-                debug("session_close_x11: x11 channel %d missing", id);
+        if ((c = channel_by_id(ssh, id)) == NULL) {
+                debug("%s: x11 channel %d missing", __func__, id);
         } else {
                 /* Detach X11 listener */
-                debug("session_close_x11: detach x11 channel %d", id);
-                channel_cancel_cleanup(id);
+                debug("%s: detach x11 channel %d", __func__, id);
+                channel_cancel_cleanup(ssh, id);
                 if (c->ostate != CHAN_OUTPUT_CLOSED)
-                        chan_mark_dead(c);
+                        chan_mark_dead(ssh, c);
         }
 }
 
 static void
-session_close_single_x11(int id, void *arg)
+session_close_single_x11(struct ssh *ssh, int id, void *arg)
 {
         Session *s;
         u_int i;
 
-        debug3("session_close_single_x11: channel %d", id);
-        channel_cancel_cleanup(id);
+        debug3("%s: channel %d", __func__, id);
+        channel_cancel_cleanup(ssh, id);
         if ((s = session_by_x11_channel(id)) == NULL)
-                fatal("session_close_single_x11: no x11 channel %d", id);
+                fatal("%s: no x11 channel %d", __func__, id);
         for (i = 0; s->x11_chanids[i] != -1; i++) {
-                debug("session_close_single_x11: session %d: "
-                    "closing channel %d", s->self, s->x11_chanids[i]);
+                debug("%s: session %d: closing channel %d",
+                    __func__, s->self, s->x11_chanids[i]);
                 /*
                  * The channel "id" is already closing, but make sure we
                  * close all of its siblings.
                  */
                 if (s->x11_chanids[i] != id)
-                        session_close_x11(s->x11_chanids[i]);
+                        session_close_x11(ssh, s->x11_chanids[i]);
         }
         free(s->x11_chanids);
         s->x11_chanids = NULL;
@@ -2240,22 +2227,22 @@ session_close_single_x11(int id, void *arg)
 }
 
 static void
-session_exit_message(Session *s, int status)
+session_exit_message(struct ssh *ssh, Session *s, int status)
 {
         Channel *c;
 
-        if ((c = channel_lookup(s->chanid)) == NULL)
-                fatal("session_exit_message: session %d: no channel %d",
-                    s->self, s->chanid);
-        debug("session_exit_message: session %d channel %d pid %ld",
-            s->self, s->chanid, (long)s->pid);
+        if ((c = channel_lookup(ssh, s->chanid)) == NULL)
+                fatal("%s: session %d: no channel %d",
+                    __func__, s->self, s->chanid);
+        debug("%s: session %d channel %d pid %ld",
+            __func__, s->self, s->chanid, (long)s->pid);
 
         if (WIFEXITED(status)) {
-                channel_request_start(s->chanid, "exit-status", 0);
+                channel_request_start(ssh, s->chanid, "exit-status", 0);
                 packet_put_int(WEXITSTATUS(status));
                 packet_send();
         } else if (WIFSIGNALED(status)) {
-                channel_request_start(s->chanid, "exit-signal", 0);
+                channel_request_start(ssh, s->chanid, "exit-signal", 0);
                 packet_put_cstring(sig2name(WTERMSIG(status)));
 #ifdef WCOREDUMP
                 packet_put_char(WCOREDUMP(status)? 1 : 0);
@@ -2271,14 +2258,14 @@ session_exit_message(Session *s, int status)
         }
 
         /* disconnect channel */
-        debug("session_exit_message: release channel %d", s->chanid);
+        debug("%s: release channel %d", __func__, s->chanid);
 
         /*
          * Adjust cleanup callback attachment to send close messages when
          * the channel gets EOF. The session will be then be closed
          * by session_close_by_channel when the childs close their fds.
          */
-        channel_register_cleanup(c->self, session_close_by_channel, 1);
+        channel_register_cleanup(ssh, c->self, session_close_by_channel, 1);
 
         /*
          * emulate a write failure with 'chan_write_failed', nobody will be
@@ -2287,13 +2274,12 @@ session_exit_message(Session *s, int status)
          * be some more data waiting in the pipe.
          */
         if (c->ostate != CHAN_OUTPUT_CLOSED)
-                chan_write_failed(c);
+                chan_write_failed(ssh, c);
 }
 
 void
-session_close(Session *s)
+session_close(struct ssh *ssh, Session *s)
 {
-        struct ssh *ssh = active_state; /* XXX */
         u_int i;
 
         verbose("Close session: user %s from %.200s port %d id %d",
@@ -2323,16 +2309,15 @@ session_close(Session *s)
 }
 
 void
-session_close_by_pid(pid_t pid, int status)
+session_close_by_pid(struct ssh *ssh, pid_t pid, int status)
 {
         Session *s = session_by_pid(pid);
         if (s == NULL) {
-                debug("session_close_by_pid: no session for pid %ld",
-                    (long)pid);
+                debug("%s: no session for pid %ld", __func__, (long)pid);
                 return;
         }
         if (s->chanid != -1)
-                session_exit_message(s, status);
+                session_exit_message(ssh, s, status);
         if (s->ttyfd != -1)
                 session_pty_cleanup(s);
         s->pid = 0;
@@ -2343,19 +2328,18 @@ session_close_by_pid(pid_t pid, int status)
  * the session 'child' itself dies
  */
 void
-session_close_by_channel(int id, void *arg)
+session_close_by_channel(struct ssh *ssh, int id, void *arg)
 {
         Session *s = session_by_channel(id);
         u_int i;
 
         if (s == NULL) {
-                debug("session_close_by_channel: no session for id %d", id);
+                debug("%s: no session for id %d", __func__, id);
                 return;
         }
-        debug("session_close_by_channel: channel %d child %ld",
-            id, (long)s->pid);
+        debug("%s: channel %d child %ld", __func__, id, (long)s->pid);
         if (s->pid != 0) {
-                debug("session_close_by_channel: channel %d: has child", id);
+                debug("%s: channel %d: has child", __func__, id);
                 /*
                  * delay detach of session, but release pty, since
                  * the fd's to the child are already closed
@@ -2365,22 +2349,22 @@ session_close_by_channel(int id, void *arg)
                 return;
         }
         /* detach by removing callback */
-        channel_cancel_cleanup(s->chanid);
+        channel_cancel_cleanup(ssh, s->chanid);
 
         /* Close any X11 listeners associated with this session */
         if (s->x11_chanids != NULL) {
                 for (i = 0; s->x11_chanids[i] != -1; i++) {
-                        session_close_x11(s->x11_chanids[i]);
+                        session_close_x11(ssh, s->x11_chanids[i]);
                         s->x11_chanids[i] = -1;
                 }
         }
 
         s->chanid = -1;
-        session_close(s);
+        session_close(ssh, s);
 }
 
 void
-session_destroy_all(void (*closefunc)(Session *))
+session_destroy_all(struct ssh *ssh, void (*closefunc)(Session *))
 {
         int i;
         for (i = 0; i < sessions_nalloc; i++) {
@@ -2389,7 +2373,7 @@ session_destroy_all(void (*closefunc)(Session *))
                         if (closefunc != NULL)
                                 closefunc(s);
                         else
-                                session_close(s);
+                                session_close(ssh, s);
                 }
         }
 }
@@ -2432,7 +2416,7 @@ session_proctitle(Session *s)
 }
 
 int
-session_setup_x11fwd(Session *s)
+session_setup_x11fwd(struct ssh *ssh, Session *s)
 {
         struct stat st;
         char display[512], auth_display[512];
@@ -2456,14 +2440,14 @@ session_setup_x11fwd(Session *s)
                 debug("X11 display already set.");
                 return 0;
         }
-        if (x11_create_display_inet(options.x11_display_offset,
+        if (x11_create_display_inet(ssh, options.x11_display_offset,
             options.x11_use_localhost, s->single_connection,
             &s->display_number, &s->x11_chanids) == -1) {
                 debug("x11_create_display_inet failed.");
                 return 0;
         }
         for (i = 0; s->x11_chanids[i] != -1; i++) {
-                channel_register_cleanup(s->x11_chanids[i],
+                channel_register_cleanup(ssh, s->x11_chanids[i],
                     session_close_single_x11, 0);
         }
 
@@ -2508,13 +2492,13 @@ session_setup_x11fwd(Session *s)
 }
 
 static void
-do_authenticated2(Authctxt *authctxt)
+do_authenticated2(struct ssh *ssh, Authctxt *authctxt)
 {
-        server_loop2(authctxt);
+        server_loop2(ssh, authctxt);
 }
 
 void
-do_cleanup(Authctxt *authctxt)
+do_cleanup(struct ssh *ssh, Authctxt *authctxt)
 {
         static int called = 0;
 
@@ -2556,12 +2540,21 @@ do_cleanup(Authctxt *authctxt)
         /* remove agent socket */
         auth_sock_cleanup_proc(authctxt->pw);
 
+        /* remove userauth info */
+        if (auth_info_file != NULL) {
+                temporarily_use_uid(authctxt->pw);
+                unlink(auth_info_file);
+                restore_uid();
+                free(auth_info_file);
+                auth_info_file = NULL;
+        }
+
         /*
          * Cleanup ptys/utmp only if privsep is disabled,
          * or if running in monitor.
          */
         if (!use_privsep || mm_is_monitor())
-                session_destroy_all(session_pty_cleanup2);
+                session_destroy_all(ssh, session_pty_cleanup2);
 }
 
 /* Return a name for the remote host that fits inside utmp_size */