2 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * As far as I am concerned, the code I have written for this software
6 * can be used freely for any purpose. Any derived versions of this
7 * software must be clearly marked as such, and if the derived work is
8 * incompatible with the protocol description in the RFC file, it must be
9 * called by a name other than "ssh" or "Secure Shell".
11 * SSH2 support by Markus Friedl.
12 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 RCSID("$OpenBSD: session.c,v 1.172 2004/01/30 09:48:57 markus Exp $");
51 #include "auth-options.h"
52 #include "pathnames.h"
56 #include "serverloop.h"
59 #include "monitor_wrap.h"
61 #if defined(KRB5) && defined(USE_AFS)
71 Session *session_new(void);
72 void session_set_fds(Session *, int, int, int);
73 void session_pty_cleanup(Session *);
74 void session_proctitle(Session *);
75 int session_setup_x11fwd(Session *);
76 void do_exec_pty(Session *, const char *);
77 void do_exec_no_pty(Session *, const char *);
78 void do_exec(Session *, const char *);
79 void do_login(Session *, const char *);
80 #ifdef LOGIN_NEEDS_UTMPX
81 static void do_pre_login(Session *s);
83 void do_child(Session *, const char *);
85 int check_quietlogin(Session *, const char *);
87 static void do_authenticated1(Authctxt *);
88 static void do_authenticated2(Authctxt *);
90 static int session_pty_req(Session *);
93 extern ServerOptions options;
94 extern char *__progname;
95 extern int log_stderr;
96 extern int debug_flag;
97 extern u_int utmp_len;
98 extern int startup_pipe;
99 extern void destroy_sensitive_data(void);
100 extern Buffer loginmsg;
102 /* original command from peer. */
103 const char *original_command = NULL;
106 #define MAX_SESSIONS 10
107 Session sessions[MAX_SESSIONS];
109 #ifdef HAVE_LOGIN_CAP
113 static int is_child = 0;
115 /* Name and directory of socket for authentication agent forwarding. */
116 static char *auth_sock_name = NULL;
117 static char *auth_sock_dir = NULL;
119 /* removes the agent forwarding socket */
122 auth_sock_cleanup_proc(struct passwd *pw)
124 if (auth_sock_name != NULL) {
125 temporarily_use_uid(pw);
126 unlink(auth_sock_name);
127 rmdir(auth_sock_dir);
128 auth_sock_name = NULL;
134 auth_input_request_forwarding(struct passwd * pw)
138 struct sockaddr_un sunaddr;
140 if (auth_sock_name != NULL) {
141 error("authentication forwarding requested twice.");
145 /* Temporarily drop privileged uid for mkdir/bind. */
146 temporarily_use_uid(pw);
148 /* Allocate a buffer for the socket name, and format the name. */
149 auth_sock_name = xmalloc(MAXPATHLEN);
150 auth_sock_dir = xmalloc(MAXPATHLEN);
151 strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
153 /* Create private directory for socket */
154 if (mkdtemp(auth_sock_dir) == NULL) {
155 packet_send_debug("Agent forwarding disabled: "
156 "mkdtemp() failed: %.100s", strerror(errno));
158 xfree(auth_sock_name);
159 xfree(auth_sock_dir);
160 auth_sock_name = NULL;
161 auth_sock_dir = NULL;
164 snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld",
165 auth_sock_dir, (long) getpid());
167 /* Create the socket. */
168 sock = socket(AF_UNIX, SOCK_STREAM, 0);
170 packet_disconnect("socket: %.100s", strerror(errno));
172 /* Bind it to the name. */
173 memset(&sunaddr, 0, sizeof(sunaddr));
174 sunaddr.sun_family = AF_UNIX;
175 strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
177 if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
178 packet_disconnect("bind: %.100s", strerror(errno));
180 /* Restore the privileged uid. */
183 /* Start listening on the socket. */
184 if (listen(sock, SSH_LISTEN_BACKLOG) < 0)
185 packet_disconnect("listen: %.100s", strerror(errno));
187 /* Allocate a channel for the authentication agent socket. */
188 nc = channel_new("auth socket",
189 SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
190 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
191 0, "auth socket", 1);
192 strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
197 display_loginmsg(void)
199 if (buffer_len(&loginmsg) > 0) {
200 buffer_append(&loginmsg, "\0", 1);
201 printf("%s\n", (char *)buffer_ptr(&loginmsg));
202 buffer_clear(&loginmsg);
207 do_authenticated(Authctxt *authctxt)
209 setproctitle("%s", authctxt->pw->pw_name);
212 * Cancel the alarm we set to limit the time taken for
216 if (startup_pipe != -1) {
220 /* setup the channel layer */
221 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
222 channel_permit_all_opens();
225 do_authenticated2(authctxt);
227 do_authenticated1(authctxt);
229 do_cleanup(authctxt);
233 * Prepares for an interactive session. This is called after the user has
234 * been successfully authenticated. During this message exchange, pseudo
235 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
236 * are requested, etc.
239 do_authenticated1(Authctxt *authctxt)
243 int success, type, screen_flag;
244 int enable_compression_after_reply = 0;
245 u_int proto_len, data_len, dlen, compression_level = 0;
248 s->authctxt = authctxt;
249 s->pw = authctxt->pw;
252 * We stay in this loop until the client requests to execute a shell
258 /* Get a packet from the client. */
259 type = packet_read();
261 /* Process the packet. */
263 case SSH_CMSG_REQUEST_COMPRESSION:
264 compression_level = packet_get_int();
266 if (compression_level < 1 || compression_level > 9) {
267 packet_send_debug("Received illegal compression level %d.",
271 if (!options.compression) {
272 debug2("compression disabled");
275 /* Enable compression after we have responded with SUCCESS. */
276 enable_compression_after_reply = 1;
280 case SSH_CMSG_REQUEST_PTY:
281 success = session_pty_req(s);
284 case SSH_CMSG_X11_REQUEST_FORWARDING:
285 s->auth_proto = packet_get_string(&proto_len);
286 s->auth_data = packet_get_string(&data_len);
288 screen_flag = packet_get_protocol_flags() &
289 SSH_PROTOFLAG_SCREEN_NUMBER;
290 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
292 if (packet_remaining() == 4) {
294 debug2("Buggy client: "
295 "X11 screen flag missing");
296 s->screen = packet_get_int();
301 success = session_setup_x11fwd(s);
303 xfree(s->auth_proto);
305 s->auth_proto = NULL;
310 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
311 if (no_agent_forwarding_flag || compat13) {
312 debug("Authentication agent forwarding not permitted for this authentication.");
315 debug("Received authentication agent forwarding request.");
316 success = auth_input_request_forwarding(s->pw);
319 case SSH_CMSG_PORT_FORWARD_REQUEST:
320 if (no_port_forwarding_flag) {
321 debug("Port forwarding not permitted for this authentication.");
324 if (!options.allow_tcp_forwarding) {
325 debug("Port forwarding not permitted.");
328 debug("Received TCP/IP port forwarding request.");
329 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
333 case SSH_CMSG_MAX_PACKET_SIZE:
334 if (packet_set_maxsize(packet_get_int()) > 0)
338 case SSH_CMSG_EXEC_SHELL:
339 case SSH_CMSG_EXEC_CMD:
340 if (type == SSH_CMSG_EXEC_CMD) {
341 command = packet_get_string(&dlen);
342 debug("Exec command '%.500s'", command);
354 * Any unknown messages in this phase are ignored,
355 * and a failure message is returned.
357 logit("Unknown packet type received after authentication: %d", type);
359 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
363 /* Enable compression now that we have replied if appropriate. */
364 if (enable_compression_after_reply) {
365 enable_compression_after_reply = 0;
366 packet_start_compression(compression_level);
372 * This is called to fork and execute a command when we have no tty. This
373 * will call do_child from the child, and server_loop from the parent after
374 * setting up file descriptors and such.
377 do_exec_no_pty(Session *s, const char *command)
382 int pin[2], pout[2], perr[2];
383 /* Allocate pipes for communicating with the program. */
384 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
385 packet_disconnect("Could not create pipes: %.100s",
387 #else /* USE_PIPES */
388 int inout[2], err[2];
389 /* Uses socket pairs to communicate with the program. */
390 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
391 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
392 packet_disconnect("Could not create socket pairs: %.100s",
394 #endif /* USE_PIPES */
396 fatal("do_exec_no_pty: no session");
398 session_proctitle(s);
401 if (options.use_pam && !use_privsep)
405 /* Fork the child. */
406 if ((pid = fork()) == 0) {
409 /* Child. Reinitialize the log since the pid has changed. */
410 log_init(__progname, options.log_level, options.log_facility, log_stderr);
413 * Create a new session and process group since the 4.4BSD
414 * setlogin() affects the entire process group.
417 error("setsid failed: %.100s", strerror(errno));
421 * Redirect stdin. We close the parent side of the socket
422 * pair, and make the child side the standard input.
425 if (dup2(pin[0], 0) < 0)
426 perror("dup2 stdin");
429 /* Redirect stdout. */
431 if (dup2(pout[1], 1) < 0)
432 perror("dup2 stdout");
435 /* Redirect stderr. */
437 if (dup2(perr[1], 2) < 0)
438 perror("dup2 stderr");
440 #else /* USE_PIPES */
442 * Redirect stdin, stdout, and stderr. Stdin and stdout will
443 * use the same socket, as some programs (particularly rdist)
444 * seem to depend on it.
448 if (dup2(inout[0], 0) < 0) /* stdin */
449 perror("dup2 stdin");
450 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
451 perror("dup2 stdout");
452 if (dup2(err[0], 2) < 0) /* stderr */
453 perror("dup2 stderr");
454 #endif /* USE_PIPES */
457 cray_init_job(s->pw); /* set up cray jid and tmpdir */
460 /* Do processing for the child (exec command etc). */
461 do_child(s, command);
465 signal(WJSIGNAL, cray_job_termination_handler);
469 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
472 packet_disconnect("fork failed: %.100s", strerror(errno));
474 /* Set interactive/non-interactive mode. */
475 packet_set_interactive(s->display != NULL);
477 /* We are the parent. Close the child sides of the pipes. */
483 session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]);
485 /* Enter the interactive session. */
486 server_loop(pid, pin[1], pout[0], perr[0]);
487 /* server_loop has closed pin[1], pout[0], and perr[0]. */
489 #else /* USE_PIPES */
490 /* We are the parent. Close the child sides of the socket pairs. */
495 * Enter the interactive session. Note: server_loop must be able to
496 * handle the case that fdin and fdout are the same.
499 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
501 server_loop(pid, inout[1], inout[1], err[1]);
502 /* server_loop has closed inout[1] and err[1]. */
504 #endif /* USE_PIPES */
508 * This is called to fork and execute a command when we have a tty. This
509 * will call do_child from the child, and server_loop from the parent after
510 * setting up file descriptors, controlling tty, updating wtmp, utmp,
511 * lastlog, and other such operations.
514 do_exec_pty(Session *s, const char *command)
516 int fdout, ptyfd, ttyfd, ptymaster;
520 fatal("do_exec_pty: no session");
525 if (options.use_pam) {
526 do_pam_set_tty(s->tty);
532 /* Fork the child. */
533 if ((pid = fork()) == 0) {
536 /* Child. Reinitialize the log because the pid has changed. */
537 log_init(__progname, options.log_level, options.log_facility, log_stderr);
538 /* Close the master side of the pseudo tty. */
541 /* Make the pseudo tty our controlling tty. */
542 pty_make_controlling_tty(&ttyfd, s->tty);
544 /* Redirect stdin/stdout/stderr from the pseudo tty. */
545 if (dup2(ttyfd, 0) < 0)
546 error("dup2 stdin: %s", strerror(errno));
547 if (dup2(ttyfd, 1) < 0)
548 error("dup2 stdout: %s", strerror(errno));
549 if (dup2(ttyfd, 2) < 0)
550 error("dup2 stderr: %s", strerror(errno));
552 /* Close the extra descriptor for the pseudo tty. */
555 /* record login, etc. similar to login(1) */
557 if (!(options.use_login && command == NULL)) {
559 cray_init_job(s->pw); /* set up cray jid and tmpdir */
561 do_login(s, command);
563 # ifdef LOGIN_NEEDS_UTMPX
569 /* Do common processing for the child, such as execing the command. */
570 do_child(s, command);
574 signal(WJSIGNAL, cray_job_termination_handler);
578 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
581 packet_disconnect("fork failed: %.100s", strerror(errno));
584 /* Parent. Close the slave side of the pseudo tty. */
588 * Create another descriptor of the pty master side for use as the
589 * standard input. We could use the original descriptor, but this
590 * simplifies code in server_loop. The descriptor is bidirectional.
594 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
596 /* we keep a reference to the pty master */
597 ptymaster = dup(ptyfd);
599 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
600 s->ptymaster = ptymaster;
602 /* Enter interactive session. */
603 packet_set_interactive(1);
605 session_set_fds(s, ptyfd, fdout, -1);
607 server_loop(pid, ptyfd, fdout, -1);
608 /* server_loop _has_ closed ptyfd and fdout. */
612 #ifdef LOGIN_NEEDS_UTMPX
614 do_pre_login(Session *s)
617 struct sockaddr_storage from;
618 pid_t pid = getpid();
621 * Get IP address of client. If the connection is not a socket, let
622 * the address be 0.0.0.0.
624 memset(&from, 0, sizeof(from));
625 fromlen = sizeof(from);
626 if (packet_connection_is_on_socket()) {
627 if (getpeername(packet_get_connection_in(),
628 (struct sockaddr *) & from, &fromlen) < 0) {
629 debug("getpeername: %.100s", strerror(errno));
634 record_utmp_only(pid, s->tty, s->pw->pw_name,
635 get_remote_name_or_ip(utmp_len, options.use_dns),
636 (struct sockaddr *)&from, fromlen);
641 * This is called to fork and execute a command. If another command is
642 * to be forced, execute that instead.
645 do_exec(Session *s, const char *command)
647 if (forced_command) {
648 original_command = command;
649 command = forced_command;
650 debug("Forced command '%.900s'", command);
654 if (options.gss_authentication) {
655 temporarily_use_uid(s->pw);
656 ssh_gssapi_storecreds();
662 do_exec_pty(s, command);
664 do_exec_no_pty(s, command);
666 original_command = NULL;
670 /* administrative, login(1)-like work */
672 do_login(Session *s, const char *command)
676 struct sockaddr_storage from;
677 struct passwd * pw = s->pw;
678 pid_t pid = getpid();
681 * Get IP address of client. If the connection is not a socket, let
682 * the address be 0.0.0.0.
684 memset(&from, 0, sizeof(from));
685 fromlen = sizeof(from);
686 if (packet_connection_is_on_socket()) {
687 if (getpeername(packet_get_connection_in(),
688 (struct sockaddr *) & from, &fromlen) < 0) {
689 debug("getpeername: %.100s", strerror(errno));
694 /* Record that there was a login on that tty from the remote host. */
696 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
697 get_remote_name_or_ip(utmp_len,
699 (struct sockaddr *)&from, fromlen);
703 * If password change is needed, do it now.
704 * This needs to occur before the ~/.hushlogin check.
706 if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) {
709 s->authctxt->force_pwchange = 0;
710 /* XXX - signal [net] parent to enable forwardings */
714 if (check_quietlogin(s, command))
719 #ifndef NO_SSH_LASTLOG
720 if (options.print_lastlog && s->last_login_time != 0) {
721 time_string = ctime(&s->last_login_time);
722 if (strchr(time_string, '\n'))
723 *strchr(time_string, '\n') = 0;
724 if (strcmp(s->hostname, "") == 0)
725 printf("Last login: %s\r\n", time_string);
727 printf("Last login: %s from %s\r\n", time_string,
730 #endif /* NO_SSH_LASTLOG */
736 * Display the message of the day.
744 if (options.print_motd) {
745 #ifdef HAVE_LOGIN_CAP
746 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
749 f = fopen("/etc/motd", "r");
752 while (fgets(buf, sizeof(buf), f))
761 * Check for quiet login, either .hushlogin or command given.
764 check_quietlogin(Session *s, const char *command)
767 struct passwd *pw = s->pw;
770 /* Return 1 if .hushlogin exists or a command given. */
773 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
774 #ifdef HAVE_LOGIN_CAP
775 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
778 if (stat(buf, &st) >= 0)
785 * Sets the value of the given variable in the environment. If the variable
786 * already exists, its value is overriden.
789 child_set_env(char ***envp, u_int *envsizep, const char *name,
797 * If we're passed an uninitialized list, allocate a single null
798 * entry before continuing.
800 if (*envp == NULL && *envsizep == 0) {
801 *envp = xmalloc(sizeof(char *));
807 * Find the slot where the value should be stored. If the variable
808 * already exists, we reuse the slot; otherwise we append a new slot
809 * at the end of the array, expanding if necessary.
812 namelen = strlen(name);
813 for (i = 0; env[i]; i++)
814 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
817 /* Reuse the slot. */
820 /* New variable. Expand if necessary. */
822 if (i >= envsize - 1) {
824 fatal("child_set_env: too many env vars");
826 env = (*envp) = xrealloc(env, envsize * sizeof(char *));
829 /* Need to set the NULL pointer at end of array beyond the new slot. */
833 /* Allocate space and format the variable in the appropriate slot. */
834 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
835 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
839 * Reads environment variables from the given file and adds/overrides them
840 * into the environment. If the file does not exist, this does nothing.
841 * Otherwise, it must consist of empty lines, comments (line starts with '#')
842 * and assignments of the form name=value. No other forms are allowed.
845 read_environment_file(char ***env, u_int *envsize,
846 const char *filename)
853 f = fopen(filename, "r");
857 while (fgets(buf, sizeof(buf), f)) {
859 fatal("Too many lines in environment file %s", filename);
860 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
862 if (!*cp || *cp == '#' || *cp == '\n')
864 if (strchr(cp, '\n'))
865 *strchr(cp, '\n') = '\0';
866 value = strchr(cp, '=');
868 fprintf(stderr, "Bad line %u in %.100s\n", lineno,
873 * Replace the equals sign by nul, and advance value to
878 child_set_env(env, envsize, cp, value);
883 #ifdef HAVE_ETC_DEFAULT_LOGIN
885 * Return named variable from specified environment, or NULL if not present.
888 child_get_env(char **env, const char *name)
894 for (i=0; env[i] != NULL; i++)
895 if (strncmp(name, env[i], len) == 0 && env[i][len] == '=')
896 return(env[i] + len + 1);
901 * Read /etc/default/login.
902 * We pick up the PATH (or SUPATH for root) and UMASK.
905 read_etc_default_login(char ***env, u_int *envsize, uid_t uid)
907 char **tmpenv = NULL, *var;
908 u_int i, tmpenvsize = 0;
912 * We don't want to copy the whole file to the child's environment,
913 * so we use a temporary environment and copy the variables we're
916 read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login");
922 var = child_get_env(tmpenv, "SUPATH");
924 var = child_get_env(tmpenv, "PATH");
926 child_set_env(env, envsize, "PATH", var);
928 if ((var = child_get_env(tmpenv, "UMASK")) != NULL)
929 if (sscanf(var, "%5lo", &mask) == 1)
932 for (i = 0; tmpenv[i] != NULL; i++)
936 #endif /* HAVE_ETC_DEFAULT_LOGIN */
938 void copy_environment(char **source, char ***env, u_int *envsize)
940 char *var_name, *var_val;
946 for(i = 0; source[i] != NULL; i++) {
947 var_name = xstrdup(source[i]);
948 if ((var_val = strstr(var_name, "=")) == NULL) {
954 debug3("Copy environment: %s=%s", var_name, var_val);
955 child_set_env(env, envsize, var_name, var_val);
962 do_setup_env(Session *s, const char *shell)
966 char **env, *laddr, *path = NULL;
967 struct passwd *pw = s->pw;
969 /* Initialize the environment. */
971 env = xmalloc(envsize * sizeof(char *));
976 * The Windows environment contains some setting which are
977 * important for a running system. They must not be dropped.
979 copy_environment(environ, &env, &envsize);
983 /* Allow any GSSAPI methods that we've used to alter
984 * the childs environment as they see fit
986 ssh_gssapi_do_child(&env, &envsize);
989 if (!options.use_login) {
990 /* Set basic environment. */
991 child_set_env(&env, &envsize, "USER", pw->pw_name);
992 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
994 child_set_env(&env, &envsize, "LOGIN", pw->pw_name);
996 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
997 #ifdef HAVE_LOGIN_CAP
998 if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
999 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1001 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1002 #else /* HAVE_LOGIN_CAP */
1003 # ifndef HAVE_CYGWIN
1005 * There's no standard path on Windows. The path contains
1006 * important components pointing to the system directories,
1007 * needed for loading shared libraries. So the path better
1008 * remains intact here.
1010 # ifdef HAVE_ETC_DEFAULT_LOGIN
1011 read_etc_default_login(&env, &envsize, pw->pw_uid);
1012 path = child_get_env(env, "PATH");
1013 # endif /* HAVE_ETC_DEFAULT_LOGIN */
1014 if (path == NULL || *path == '\0') {
1015 child_set_env(&env, &envsize, "PATH",
1016 s->pw->pw_uid == 0 ?
1017 SUPERUSER_PATH : _PATH_STDPATH);
1019 # endif /* HAVE_CYGWIN */
1020 #endif /* HAVE_LOGIN_CAP */
1022 snprintf(buf, sizeof buf, "%.200s/%.50s",
1023 _PATH_MAILDIR, pw->pw_name);
1024 child_set_env(&env, &envsize, "MAIL", buf);
1026 /* Normal systems set SHELL by default. */
1027 child_set_env(&env, &envsize, "SHELL", shell);
1030 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1032 /* Set custom environment options from RSA authentication. */
1033 if (!options.use_login) {
1034 while (custom_environment) {
1035 struct envstring *ce = custom_environment;
1038 for (i = 0; str[i] != '=' && str[i]; i++)
1040 if (str[i] == '=') {
1042 child_set_env(&env, &envsize, str, str + i + 1);
1044 custom_environment = ce->next;
1050 /* SSH_CLIENT deprecated */
1051 snprintf(buf, sizeof buf, "%.50s %d %d",
1052 get_remote_ipaddr(), get_remote_port(), get_local_port());
1053 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1055 laddr = get_local_ipaddr(packet_get_connection_in());
1056 snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1057 get_remote_ipaddr(), get_remote_port(), laddr, get_local_port());
1059 child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1062 child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1064 child_set_env(&env, &envsize, "TERM", s->term);
1066 child_set_env(&env, &envsize, "DISPLAY", s->display);
1067 if (original_command)
1068 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1072 if (cray_tmpdir[0] != '\0')
1073 child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir);
1074 #endif /* _UNICOS */
1080 if ((cp = getenv("AUTHSTATE")) != NULL)
1081 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1082 if ((cp = getenv("KRB5CCNAME")) != NULL)
1083 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1084 read_environment_file(&env, &envsize, "/etc/environment");
1088 if (s->authctxt->krb5_ticket_file)
1089 child_set_env(&env, &envsize, "KRB5CCNAME",
1090 s->authctxt->krb5_ticket_file);
1094 * Pull in any environment variables that may have
1097 if (options.use_pam) {
1100 p = fetch_pam_child_environment();
1101 copy_environment(p, &env, &envsize);
1102 free_pam_environment(p);
1104 p = fetch_pam_environment();
1105 copy_environment(p, &env, &envsize);
1106 free_pam_environment(p);
1108 #endif /* USE_PAM */
1110 if (auth_sock_name != NULL)
1111 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1114 /* read $HOME/.ssh/environment. */
1115 if (options.permit_user_env && !options.use_login) {
1116 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1117 strcmp(pw->pw_dir, "/") ? pw->pw_dir : "");
1118 read_environment_file(&env, &envsize, buf);
1121 /* dump the environment */
1122 fprintf(stderr, "Environment:\n");
1123 for (i = 0; env[i]; i++)
1124 fprintf(stderr, " %.200s\n", env[i]);
1130 * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
1131 * first in this order).
1134 do_rc_files(Session *s, const char *shell)
1142 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
1144 /* ignore _PATH_SSH_USER_RC for subsystems */
1145 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
1146 snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
1147 shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
1149 fprintf(stderr, "Running %s\n", cmd);
1150 f = popen(cmd, "w");
1153 fprintf(f, "%s %s\n", s->auth_proto,
1157 fprintf(stderr, "Could not run %s\n",
1159 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
1161 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
1162 _PATH_SSH_SYSTEM_RC);
1163 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
1166 fprintf(f, "%s %s\n", s->auth_proto,
1170 fprintf(stderr, "Could not run %s\n",
1171 _PATH_SSH_SYSTEM_RC);
1172 } else if (do_xauth && options.xauth_location != NULL) {
1173 /* Add authority data to .Xauthority if appropriate. */
1176 "Running %.500s remove %.100s\n",
1177 options.xauth_location, s->auth_display);
1179 "%.500s add %.100s %.100s %.100s\n",
1180 options.xauth_location, s->auth_display,
1181 s->auth_proto, s->auth_data);
1183 snprintf(cmd, sizeof cmd, "%s -q -",
1184 options.xauth_location);
1185 f = popen(cmd, "w");
1187 fprintf(f, "remove %s\n",
1189 fprintf(f, "add %s %s %s\n",
1190 s->auth_display, s->auth_proto,
1194 fprintf(stderr, "Could not run %s\n",
1201 do_nologin(struct passwd *pw)
1206 #ifdef HAVE_LOGIN_CAP
1207 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1208 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1209 _PATH_NOLOGIN), "r");
1212 f = fopen(_PATH_NOLOGIN, "r");
1215 /* /etc/nologin exists. Print its contents and exit. */
1216 logit("User %.100s not allowed because %s exists",
1217 pw->pw_name, _PATH_NOLOGIN);
1218 while (fgets(buf, sizeof(buf), f))
1226 /* Set login name, uid, gid, and groups. */
1228 do_setusercontext(struct passwd *pw)
1231 if (getuid() == 0 || geteuid() == 0)
1232 #endif /* HAVE_CYGWIN */
1235 #ifdef HAVE_SETPCRED
1236 if (setpcred(pw->pw_name, (char **)NULL) == -1)
1237 fatal("Failed to set process credentials");
1238 #endif /* HAVE_SETPCRED */
1239 #ifdef HAVE_LOGIN_CAP
1244 if (options.use_pam) {
1248 # endif /* USE_PAM */
1249 if (setusercontext(lc, pw, pw->pw_uid,
1250 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1251 perror("unable to set user context");
1255 # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
1256 /* Sets login uid for accounting */
1257 if (getluid() == -1 && setluid(pw->pw_uid) == -1)
1258 error("setluid: %s", strerror(errno));
1259 # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
1261 if (setlogin(pw->pw_name) < 0)
1262 error("setlogin failed: %s", strerror(errno));
1263 if (setgid(pw->pw_gid) < 0) {
1267 /* Initialize the group list. */
1268 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1269 perror("initgroups");
1275 * PAM credentials may take the form of supplementary groups.
1276 * These will have been wiped by the above initgroups() call.
1277 * Reestablish them here.
1279 if (options.use_pam) {
1283 # endif /* USE_PAM */
1284 # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
1285 irix_setusercontext(pw);
1286 # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
1290 /* Permanently switch to the desired uid. */
1291 permanently_set_uid(pw);
1298 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1299 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1303 do_pwchange(Session *s)
1305 fprintf(stderr, "WARNING: Your password has expired.\n");
1306 if (s->ttyfd != -1) {
1308 "You must change your password now and login again!\n");
1309 execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
1313 "Password change required but no TTY available.\n");
1319 launch_login(struct passwd *pw, const char *hostname)
1321 /* Launch login(1). */
1323 execl(LOGIN_PROGRAM, "login", "-h", hostname,
1324 #ifdef xxxLOGIN_NEEDS_TERM
1325 (s->term ? s->term : "unknown"),
1326 #endif /* LOGIN_NEEDS_TERM */
1327 #ifdef LOGIN_NO_ENDOPT
1328 "-p", "-f", pw->pw_name, (char *)NULL);
1330 "-p", "-f", "--", pw->pw_name, (char *)NULL);
1333 /* Login couldn't be executed, die. */
1340 child_close_fds(void)
1344 if (packet_get_connection_in() == packet_get_connection_out())
1345 close(packet_get_connection_in());
1347 close(packet_get_connection_in());
1348 close(packet_get_connection_out());
1351 * Close all descriptors related to channels. They will still remain
1352 * open in the parent.
1354 /* XXX better use close-on-exec? -markus */
1355 channel_close_all();
1358 * Close any extra file descriptors. Note that there may still be
1359 * descriptors left by system functions. They will be closed later.
1364 * Close any extra open file descriptors so that we don\'t have them
1365 * hanging around in clients. Note that we want to do this after
1366 * initgroups, because at least on Solaris 2.3 it leaves file
1369 for (i = 3; i < 64; i++)
1374 * Performs common processing for the child, such as setting up the
1375 * environment, closing extra file descriptors, setting the user and group
1376 * ids, and executing the command or shell.
1379 do_child(Session *s, const char *command)
1381 extern char **environ;
1384 const char *shell, *shell0, *hostname = NULL;
1385 struct passwd *pw = s->pw;
1387 /* remove hostkey from the child's memory */
1388 destroy_sensitive_data();
1390 /* Force a password change */
1391 if (s->authctxt->force_pwchange) {
1392 do_setusercontext(pw);
1398 /* login(1) is only called if we execute the login shell */
1399 if (options.use_login && command != NULL)
1400 options.use_login = 0;
1403 cray_setup(pw->pw_uid, pw->pw_name, command);
1404 #endif /* _UNICOS */
1407 * Login(1) does this as well, and it needs uid 0 for the "-h"
1408 * switch, so we let login(1) to this for us.
1410 if (!options.use_login) {
1412 session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty);
1413 if (!check_quietlogin(s, command))
1415 #else /* HAVE_OSF_SIA */
1417 do_setusercontext(pw);
1418 #endif /* HAVE_OSF_SIA */
1422 * Get the shell from the password data. An empty shell field is
1423 * legal, and means /bin/sh.
1425 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1428 * Make sure $SHELL points to the shell from the password file,
1429 * even if shell is overridden from login.conf
1431 env = do_setup_env(s, shell);
1433 #ifdef HAVE_LOGIN_CAP
1434 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1437 /* we have to stash the hostname before we close our socket. */
1438 if (options.use_login)
1439 hostname = get_remote_name_or_ip(utmp_len,
1442 * Close the connection descriptors; note that this is the child, and
1443 * the server will still have the socket open, and it is important
1444 * that we do not shutdown it. Note that the descriptors cannot be
1445 * closed before building the environment, as we call
1446 * get_remote_ipaddr there.
1451 * Must take new environment into use so that .ssh/rc,
1452 * /etc/ssh/sshrc and xauth are run in the proper environment.
1456 #if defined(KRB5) && defined(USE_AFS)
1458 * At this point, we check to see if AFS is active and if we have
1459 * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1460 * if we can (and need to) extend the ticket into an AFS token. If
1461 * we don't do this, we run into potential problems if the user's
1462 * home directory is in AFS and it's not world-readable.
1465 if (options.kerberos_get_afs_token && k_hasafs() &&
1466 (s->authctxt->krb5_ctx != NULL)) {
1469 debug("Getting AFS token");
1473 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1474 krb5_afslog(s->authctxt->krb5_ctx,
1475 s->authctxt->krb5_fwd_ccache, cell, NULL);
1477 krb5_afslog_home(s->authctxt->krb5_ctx,
1478 s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1482 /* Change current directory to the user\'s home directory. */
1483 if (chdir(pw->pw_dir) < 0) {
1484 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1485 pw->pw_dir, strerror(errno));
1486 #ifdef HAVE_LOGIN_CAP
1487 if (login_getcapbool(lc, "requirehome", 0))
1492 if (!options.use_login)
1493 do_rc_files(s, shell);
1495 /* restore SIGPIPE for child */
1496 signal(SIGPIPE, SIG_DFL);
1498 if (options.use_login) {
1499 launch_login(pw, hostname);
1503 /* Get the last component of the shell name. */
1504 if ((shell0 = strrchr(shell, '/')) != NULL)
1510 * If we have no command, execute the shell. In this case, the shell
1511 * name to be passed in argv[0] is preceded by '-' to indicate that
1512 * this is a login shell.
1517 /* Start the shell. Set initial character to '-'. */
1520 if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1521 >= sizeof(argv0) - 1) {
1527 /* Execute the shell. */
1530 execve(shell, argv, env);
1532 /* Executing the shell failed. */
1537 * Execute the command using the user's shell. This uses the -c
1538 * option to execute the command.
1540 argv[0] = (char *) shell0;
1542 argv[2] = (char *) command;
1544 execve(shell, argv, env);
1553 static int did_init = 0;
1555 debug("session_new: init");
1556 for (i = 0; i < MAX_SESSIONS; i++) {
1557 sessions[i].used = 0;
1561 for (i = 0; i < MAX_SESSIONS; i++) {
1562 Session *s = &sessions[i];
1564 memset(s, 0, sizeof(*s));
1570 debug("session_new: session %d", i);
1581 for (i = 0; i < MAX_SESSIONS; i++) {
1582 Session *s = &sessions[i];
1583 debug("dump: used %d session %d %p channel %d pid %ld",
1593 session_open(Authctxt *authctxt, int chanid)
1595 Session *s = session_new();
1596 debug("session_open: channel %d", chanid);
1598 error("no more sessions");
1601 s->authctxt = authctxt;
1602 s->pw = authctxt->pw;
1603 if (s->pw == NULL || !authctxt->valid)
1604 fatal("no user for session %d", s->self);
1605 debug("session_open: session %d: link with channel %d", s->self, chanid);
1611 session_by_tty(char *tty)
1614 for (i = 0; i < MAX_SESSIONS; i++) {
1615 Session *s = &sessions[i];
1616 if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1617 debug("session_by_tty: session %d tty %s", i, tty);
1621 debug("session_by_tty: unknown tty %.100s", tty);
1627 session_by_channel(int id)
1630 for (i = 0; i < MAX_SESSIONS; i++) {
1631 Session *s = &sessions[i];
1632 if (s->used && s->chanid == id) {
1633 debug("session_by_channel: session %d channel %d", i, id);
1637 debug("session_by_channel: unknown channel %d", id);
1643 session_by_pid(pid_t pid)
1646 debug("session_by_pid: pid %ld", (long)pid);
1647 for (i = 0; i < MAX_SESSIONS; i++) {
1648 Session *s = &sessions[i];
1649 if (s->used && s->pid == pid)
1652 error("session_by_pid: unknown pid %ld", (long)pid);
1658 session_window_change_req(Session *s)
1660 s->col = packet_get_int();
1661 s->row = packet_get_int();
1662 s->xpixel = packet_get_int();
1663 s->ypixel = packet_get_int();
1665 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1670 session_pty_req(Session *s)
1676 debug("Allocating a pty not permitted for this authentication.");
1679 if (s->ttyfd != -1) {
1680 packet_disconnect("Protocol error: you already have a pty.");
1683 /* Get the time and hostname when the user last logged in. */
1684 if (options.print_lastlog) {
1685 s->hostname[0] = '\0';
1686 s->last_login_time = get_last_login_time(s->pw->pw_uid,
1687 s->pw->pw_name, s->hostname, sizeof(s->hostname));
1690 s->term = packet_get_string(&len);
1693 s->col = packet_get_int();
1694 s->row = packet_get_int();
1696 s->row = packet_get_int();
1697 s->col = packet_get_int();
1699 s->xpixel = packet_get_int();
1700 s->ypixel = packet_get_int();
1702 if (strcmp(s->term, "") == 0) {
1707 /* Allocate a pty and open it. */
1708 debug("Allocating pty.");
1709 if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
1715 error("session_pty_req: session %d alloc failed", s->self);
1718 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1720 /* for SSH1 the tty modes length is not given */
1722 n_bytes = packet_remaining();
1723 tty_parse_modes(s->ttyfd, &n_bytes);
1726 pty_setowner(s->pw, s->tty);
1728 /* Set window size from the packet. */
1729 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1732 session_proctitle(s);
1737 session_subsystem_req(Session *s)
1742 char *cmd, *subsys = packet_get_string(&len);
1746 logit("subsystem request for %.100s", subsys);
1748 for (i = 0; i < options.num_subsystems; i++) {
1749 if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1750 cmd = options.subsystem_command[i];
1751 if (stat(cmd, &st) < 0) {
1752 error("subsystem: cannot stat %s: %s", cmd,
1756 debug("subsystem: exec() %s", cmd);
1757 s->is_subsystem = 1;
1765 logit("subsystem request for %.100s failed, subsystem not found",
1773 session_x11_req(Session *s)
1777 s->single_connection = packet_get_char();
1778 s->auth_proto = packet_get_string(NULL);
1779 s->auth_data = packet_get_string(NULL);
1780 s->screen = packet_get_int();
1783 success = session_setup_x11fwd(s);
1785 xfree(s->auth_proto);
1786 xfree(s->auth_data);
1787 s->auth_proto = NULL;
1788 s->auth_data = NULL;
1794 session_shell_req(Session *s)
1802 session_exec_req(Session *s)
1805 char *command = packet_get_string(&len);
1807 do_exec(s, command);
1813 session_break_req(Session *s)
1817 break_length = packet_get_int(); /* ignored */
1820 if (s->ttyfd == -1 ||
1821 tcsendbreak(s->ttyfd, 0) < 0)
1827 session_auth_agent_req(Session *s)
1829 static int called = 0;
1831 if (no_agent_forwarding_flag) {
1832 debug("session_auth_agent_req: no_agent_forwarding_flag");
1839 return auth_input_request_forwarding(s->pw);
1844 session_input_channel_req(Channel *c, const char *rtype)
1849 if ((s = session_by_channel(c->self)) == NULL) {
1850 logit("session_input_channel_req: no session %d req %.100s",
1854 debug("session_input_channel_req: session %d req %s", s->self, rtype);
1857 * a session is in LARVAL state until a shell, a command
1858 * or a subsystem is executed
1860 if (c->type == SSH_CHANNEL_LARVAL) {
1861 if (strcmp(rtype, "shell") == 0) {
1862 success = session_shell_req(s);
1863 } else if (strcmp(rtype, "exec") == 0) {
1864 success = session_exec_req(s);
1865 } else if (strcmp(rtype, "pty-req") == 0) {
1866 success = session_pty_req(s);
1867 } else if (strcmp(rtype, "x11-req") == 0) {
1868 success = session_x11_req(s);
1869 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1870 success = session_auth_agent_req(s);
1871 } else if (strcmp(rtype, "subsystem") == 0) {
1872 success = session_subsystem_req(s);
1873 } else if (strcmp(rtype, "break") == 0) {
1874 success = session_break_req(s);
1877 if (strcmp(rtype, "window-change") == 0) {
1878 success = session_window_change_req(s);
1884 session_set_fds(Session *s, int fdin, int fdout, int fderr)
1887 fatal("session_set_fds: called for proto != 2.0");
1889 * now that have a child and a pipe to the child,
1890 * we can activate our channel and register the fd's
1892 if (s->chanid == -1)
1893 fatal("no channel for session %d", s->self);
1894 channel_set_fds(s->chanid,
1896 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1898 CHAN_SES_WINDOW_DEFAULT);
1902 * Function to perform pty cleanup. Also called if we get aborted abnormally
1903 * (e.g., due to a dropped connection).
1906 session_pty_cleanup2(Session *s)
1909 error("session_pty_cleanup: no session");
1915 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1917 /* Record that the user has logged out. */
1919 record_logout(s->pid, s->tty, s->pw->pw_name);
1921 /* Release the pseudo-tty. */
1923 pty_release(s->tty);
1926 * Close the server side of the socket pairs. We must do this after
1927 * the pty cleanup, so that another process doesn't get this pty
1928 * while we're still cleaning up.
1930 if (close(s->ptymaster) < 0)
1931 error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
1933 /* unlink pty from session */
1938 session_pty_cleanup(Session *s)
1940 PRIVSEP(session_pty_cleanup2(s));
1946 #define SSH_SIG(x) if (sig == SIG ## x) return #x
1961 return "SIG@openssh.com";
1965 session_exit_message(Session *s, int status)
1969 if ((c = channel_lookup(s->chanid)) == NULL)
1970 fatal("session_exit_message: session %d: no channel %d",
1971 s->self, s->chanid);
1972 debug("session_exit_message: session %d channel %d pid %ld",
1973 s->self, s->chanid, (long)s->pid);
1975 if (WIFEXITED(status)) {
1976 channel_request_start(s->chanid, "exit-status", 0);
1977 packet_put_int(WEXITSTATUS(status));
1979 } else if (WIFSIGNALED(status)) {
1980 channel_request_start(s->chanid, "exit-signal", 0);
1981 packet_put_cstring(sig2name(WTERMSIG(status)));
1983 packet_put_char(WCOREDUMP(status));
1984 #else /* WCOREDUMP */
1986 #endif /* WCOREDUMP */
1987 packet_put_cstring("");
1988 packet_put_cstring("");
1991 /* Some weird exit cause. Just exit. */
1992 packet_disconnect("wait returned status %04x.", status);
1995 /* disconnect channel */
1996 debug("session_exit_message: release channel %d", s->chanid);
1997 channel_cancel_cleanup(s->chanid);
1999 * emulate a write failure with 'chan_write_failed', nobody will be
2000 * interested in data we write.
2001 * Note that we must not call 'chan_read_failed', since there could
2002 * be some more data waiting in the pipe.
2004 if (c->ostate != CHAN_OUTPUT_CLOSED)
2005 chan_write_failed(c);
2010 session_close(Session *s)
2012 debug("session_close: session %d pid %ld", s->self, (long)s->pid);
2014 session_pty_cleanup(s);
2019 if (s->auth_display)
2020 xfree(s->auth_display);
2022 xfree(s->auth_data);
2024 xfree(s->auth_proto);
2026 session_proctitle(s);
2030 session_close_by_pid(pid_t pid, int status)
2032 Session *s = session_by_pid(pid);
2034 debug("session_close_by_pid: no session for pid %ld",
2038 if (s->chanid != -1)
2039 session_exit_message(s, status);
2044 * this is called when a channel dies before
2045 * the session 'child' itself dies
2048 session_close_by_channel(int id, void *arg)
2050 Session *s = session_by_channel(id);
2052 debug("session_close_by_channel: no session for id %d", id);
2055 debug("session_close_by_channel: channel %d child %ld",
2058 debug("session_close_by_channel: channel %d: has child", id);
2060 * delay detach of session, but release pty, since
2061 * the fd's to the child are already closed
2064 session_pty_cleanup(s);
2067 /* detach by removing callback */
2068 channel_cancel_cleanup(s->chanid);
2074 session_destroy_all(void (*closefunc)(Session *))
2077 for (i = 0; i < MAX_SESSIONS; i++) {
2078 Session *s = &sessions[i];
2080 if (closefunc != NULL)
2089 session_tty_list(void)
2091 static char buf[1024];
2096 for (i = 0; i < MAX_SESSIONS; i++) {
2097 Session *s = &sessions[i];
2098 if (s->used && s->ttyfd != -1) {
2100 if (strncmp(s->tty, "/dev/", 5) != 0) {
2101 cp = strrchr(s->tty, '/');
2102 cp = (cp == NULL) ? s->tty : cp + 1;
2107 strlcat(buf, ",", sizeof buf);
2108 strlcat(buf, cp, sizeof buf);
2112 strlcpy(buf, "notty", sizeof buf);
2117 session_proctitle(Session *s)
2120 error("no user for session %d", s->self);
2122 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
2126 session_setup_x11fwd(Session *s)
2129 char display[512], auth_display[512];
2130 char hostname[MAXHOSTNAMELEN];
2132 if (no_x11_forwarding_flag) {
2133 packet_send_debug("X11 forwarding disabled in user configuration file.");
2136 if (!options.x11_forwarding) {
2137 debug("X11 forwarding disabled in server configuration file.");
2140 if (!options.xauth_location ||
2141 (stat(options.xauth_location, &st) == -1)) {
2142 packet_send_debug("No xauth program; cannot forward with spoofing.");
2145 if (options.use_login) {
2146 packet_send_debug("X11 forwarding disabled; "
2147 "not compatible with UseLogin=yes.");
2150 if (s->display != NULL) {
2151 debug("X11 display already set.");
2154 if (x11_create_display_inet(options.x11_display_offset,
2155 options.x11_use_localhost, s->single_connection,
2156 &s->display_number) == -1) {
2157 debug("x11_create_display_inet failed.");
2161 /* Set up a suitable value for the DISPLAY variable. */
2162 if (gethostname(hostname, sizeof(hostname)) < 0)
2163 fatal("gethostname: %.100s", strerror(errno));
2165 * auth_display must be used as the displayname when the
2166 * authorization entry is added with xauth(1). This will be
2167 * different than the DISPLAY string for localhost displays.
2169 if (options.x11_use_localhost) {
2170 snprintf(display, sizeof display, "localhost:%u.%u",
2171 s->display_number, s->screen);
2172 snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
2173 s->display_number, s->screen);
2174 s->display = xstrdup(display);
2175 s->auth_display = xstrdup(auth_display);
2177 #ifdef IPADDR_IN_DISPLAY
2179 struct in_addr my_addr;
2181 he = gethostbyname(hostname);
2183 error("Can't get IP address for X11 DISPLAY.");
2184 packet_send_debug("Can't get IP address for X11 DISPLAY.");
2187 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
2188 snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr),
2189 s->display_number, s->screen);
2191 snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
2192 s->display_number, s->screen);
2194 s->display = xstrdup(display);
2195 s->auth_display = xstrdup(display);
2202 do_authenticated2(Authctxt *authctxt)
2204 server_loop2(authctxt);
2208 do_cleanup(Authctxt *authctxt)
2210 static int called = 0;
2212 debug("do_cleanup");
2214 /* no cleanup if we're in the child for login shell */
2218 /* avoid double cleanup */
2223 if (authctxt == NULL)
2226 if (options.kerberos_ticket_cleanup &&
2228 krb5_cleanup_proc(authctxt);
2232 if (compat20 && options.gss_cleanup_creds)
2233 ssh_gssapi_cleanup_creds();
2237 if (options.use_pam) {
2239 sshpam_thread_cleanup();
2243 /* remove agent socket */
2244 auth_sock_cleanup_proc(authctxt->pw);
2247 * Cleanup ptys/utmp only if privsep is disabled,
2248 * or if running in monitor.
2250 if (!use_privsep || mm_is_monitor())
2251 session_destroy_all(session_pty_cleanup2);