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 1.178 2004/07/11 17:48:47 deraadt 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);
208 do_authenticated(Authctxt *authctxt)
210 setproctitle("%s", authctxt->pw->pw_name);
213 * Cancel the alarm we set to limit the time taken for
217 if (startup_pipe != -1) {
221 /* setup the channel layer */
222 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
223 channel_permit_all_opens();
226 do_authenticated2(authctxt);
228 do_authenticated1(authctxt);
230 do_cleanup(authctxt);
234 * Prepares for an interactive session. This is called after the user has
235 * been successfully authenticated. During this message exchange, pseudo
236 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
237 * are requested, etc.
240 do_authenticated1(Authctxt *authctxt)
244 int success, type, screen_flag;
245 int enable_compression_after_reply = 0;
246 u_int proto_len, data_len, dlen, compression_level = 0;
249 s->authctxt = authctxt;
250 s->pw = authctxt->pw;
253 * We stay in this loop until the client requests to execute a shell
259 /* Get a packet from the client. */
260 type = packet_read();
262 /* Process the packet. */
264 case SSH_CMSG_REQUEST_COMPRESSION:
265 compression_level = packet_get_int();
267 if (compression_level < 1 || compression_level > 9) {
268 packet_send_debug("Received illegal compression level %d.",
272 if (!options.compression) {
273 debug2("compression disabled");
276 /* Enable compression after we have responded with SUCCESS. */
277 enable_compression_after_reply = 1;
281 case SSH_CMSG_REQUEST_PTY:
282 success = session_pty_req(s);
285 case SSH_CMSG_X11_REQUEST_FORWARDING:
286 s->auth_proto = packet_get_string(&proto_len);
287 s->auth_data = packet_get_string(&data_len);
289 screen_flag = packet_get_protocol_flags() &
290 SSH_PROTOFLAG_SCREEN_NUMBER;
291 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
293 if (packet_remaining() == 4) {
295 debug2("Buggy client: "
296 "X11 screen flag missing");
297 s->screen = packet_get_int();
302 success = session_setup_x11fwd(s);
304 xfree(s->auth_proto);
306 s->auth_proto = NULL;
311 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
312 if (no_agent_forwarding_flag || compat13) {
313 debug("Authentication agent forwarding not permitted for this authentication.");
316 debug("Received authentication agent forwarding request.");
317 success = auth_input_request_forwarding(s->pw);
320 case SSH_CMSG_PORT_FORWARD_REQUEST:
321 if (no_port_forwarding_flag) {
322 debug("Port forwarding not permitted for this authentication.");
325 if (!options.allow_tcp_forwarding) {
326 debug("Port forwarding not permitted.");
329 debug("Received TCP/IP port forwarding request.");
330 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
334 case SSH_CMSG_MAX_PACKET_SIZE:
335 if (packet_set_maxsize(packet_get_int()) > 0)
339 case SSH_CMSG_EXEC_SHELL:
340 case SSH_CMSG_EXEC_CMD:
341 if (type == SSH_CMSG_EXEC_CMD) {
342 command = packet_get_string(&dlen);
343 debug("Exec command '%.500s'", command);
355 * Any unknown messages in this phase are ignored,
356 * and a failure message is returned.
358 logit("Unknown packet type received after authentication: %d", type);
360 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
364 /* Enable compression now that we have replied if appropriate. */
365 if (enable_compression_after_reply) {
366 enable_compression_after_reply = 0;
367 packet_start_compression(compression_level);
373 * This is called to fork and execute a command when we have no tty. This
374 * will call do_child from the child, and server_loop from the parent after
375 * setting up file descriptors and such.
378 do_exec_no_pty(Session *s, const char *command)
383 int pin[2], pout[2], perr[2];
384 /* Allocate pipes for communicating with the program. */
385 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
386 packet_disconnect("Could not create pipes: %.100s",
388 #else /* USE_PIPES */
389 int inout[2], err[2];
390 /* Uses socket pairs to communicate with the program. */
391 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
392 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
393 packet_disconnect("Could not create socket pairs: %.100s",
395 #endif /* USE_PIPES */
397 fatal("do_exec_no_pty: no session");
399 session_proctitle(s);
402 if (options.use_pam && !use_privsep)
406 /* Fork the child. */
407 if ((pid = fork()) == 0) {
410 /* Child. Reinitialize the log since the pid has changed. */
411 log_init(__progname, options.log_level, options.log_facility, log_stderr);
414 * Create a new session and process group since the 4.4BSD
415 * setlogin() affects the entire process group.
418 error("setsid failed: %.100s", strerror(errno));
422 * Redirect stdin. We close the parent side of the socket
423 * pair, and make the child side the standard input.
426 if (dup2(pin[0], 0) < 0)
427 perror("dup2 stdin");
430 /* Redirect stdout. */
432 if (dup2(pout[1], 1) < 0)
433 perror("dup2 stdout");
436 /* Redirect stderr. */
438 if (dup2(perr[1], 2) < 0)
439 perror("dup2 stderr");
441 #else /* USE_PIPES */
443 * Redirect stdin, stdout, and stderr. Stdin and stdout will
444 * use the same socket, as some programs (particularly rdist)
445 * seem to depend on it.
449 if (dup2(inout[0], 0) < 0) /* stdin */
450 perror("dup2 stdin");
451 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
452 perror("dup2 stdout");
453 if (dup2(err[0], 2) < 0) /* stderr */
454 perror("dup2 stderr");
455 #endif /* USE_PIPES */
458 cray_init_job(s->pw); /* set up cray jid and tmpdir */
461 /* Do processing for the child (exec command etc). */
462 do_child(s, command);
466 signal(WJSIGNAL, cray_job_termination_handler);
470 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
473 packet_disconnect("fork failed: %.100s", strerror(errno));
475 /* Set interactive/non-interactive mode. */
476 packet_set_interactive(s->display != NULL);
478 /* We are the parent. Close the child sides of the pipes. */
484 if (s->is_subsystem) {
488 session_set_fds(s, pin[1], pout[0], perr[0]);
490 /* Enter the interactive session. */
491 server_loop(pid, pin[1], pout[0], perr[0]);
492 /* server_loop has closed pin[1], pout[0], and perr[0]. */
494 #else /* USE_PIPES */
495 /* We are the parent. Close the child sides of the socket pairs. */
500 * Clear loginmsg, since it's the child's responsibility to display
501 * it to the user, otherwise multiple sessions may accumulate
502 * multiple copies of the login messages.
504 buffer_clear(&loginmsg);
507 * Enter the interactive session. Note: server_loop must be able to
508 * handle the case that fdin and fdout are the same.
511 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
513 server_loop(pid, inout[1], inout[1], err[1]);
514 /* server_loop has closed inout[1] and err[1]. */
516 #endif /* USE_PIPES */
520 * This is called to fork and execute a command when we have a tty. This
521 * will call do_child from the child, and server_loop from the parent after
522 * setting up file descriptors, controlling tty, updating wtmp, utmp,
523 * lastlog, and other such operations.
526 do_exec_pty(Session *s, const char *command)
528 int fdout, ptyfd, ttyfd, ptymaster;
532 fatal("do_exec_pty: no session");
537 if (options.use_pam) {
538 do_pam_set_tty(s->tty);
544 /* Fork the child. */
545 if ((pid = fork()) == 0) {
548 /* Child. Reinitialize the log because the pid has changed. */
549 log_init(__progname, options.log_level, options.log_facility, log_stderr);
550 /* Close the master side of the pseudo tty. */
553 /* Make the pseudo tty our controlling tty. */
554 pty_make_controlling_tty(&ttyfd, s->tty);
556 /* Redirect stdin/stdout/stderr from the pseudo tty. */
557 if (dup2(ttyfd, 0) < 0)
558 error("dup2 stdin: %s", strerror(errno));
559 if (dup2(ttyfd, 1) < 0)
560 error("dup2 stdout: %s", strerror(errno));
561 if (dup2(ttyfd, 2) < 0)
562 error("dup2 stderr: %s", strerror(errno));
564 /* Close the extra descriptor for the pseudo tty. */
567 /* record login, etc. similar to login(1) */
569 if (!(options.use_login && command == NULL)) {
571 cray_init_job(s->pw); /* set up cray jid and tmpdir */
573 do_login(s, command);
575 # ifdef LOGIN_NEEDS_UTMPX
581 /* Do common processing for the child, such as execing the command. */
582 do_child(s, command);
586 signal(WJSIGNAL, cray_job_termination_handler);
590 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
593 packet_disconnect("fork failed: %.100s", strerror(errno));
596 /* Parent. Close the slave side of the pseudo tty. */
600 * Create another descriptor of the pty master side for use as the
601 * standard input. We could use the original descriptor, but this
602 * simplifies code in server_loop. The descriptor is bidirectional.
606 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
608 /* we keep a reference to the pty master */
609 ptymaster = dup(ptyfd);
611 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
612 s->ptymaster = ptymaster;
614 /* Enter interactive session. */
615 packet_set_interactive(1);
617 session_set_fds(s, ptyfd, fdout, -1);
619 server_loop(pid, ptyfd, fdout, -1);
620 /* server_loop _has_ closed ptyfd and fdout. */
624 #ifdef LOGIN_NEEDS_UTMPX
626 do_pre_login(Session *s)
629 struct sockaddr_storage from;
630 pid_t pid = getpid();
633 * Get IP address of client. If the connection is not a socket, let
634 * the address be 0.0.0.0.
636 memset(&from, 0, sizeof(from));
637 fromlen = sizeof(from);
638 if (packet_connection_is_on_socket()) {
639 if (getpeername(packet_get_connection_in(),
640 (struct sockaddr *) & from, &fromlen) < 0) {
641 debug("getpeername: %.100s", strerror(errno));
646 record_utmp_only(pid, s->tty, s->pw->pw_name,
647 get_remote_name_or_ip(utmp_len, options.use_dns),
648 (struct sockaddr *)&from, fromlen);
653 * This is called to fork and execute a command. If another command is
654 * to be forced, execute that instead.
657 do_exec(Session *s, const char *command)
659 if (forced_command) {
660 original_command = command;
661 command = forced_command;
662 debug("Forced command '%.900s'", command);
666 if (options.gss_authentication) {
667 temporarily_use_uid(s->pw);
668 ssh_gssapi_storecreds();
674 do_exec_pty(s, command);
676 do_exec_no_pty(s, command);
678 original_command = NULL;
682 /* administrative, login(1)-like work */
684 do_login(Session *s, const char *command)
688 struct sockaddr_storage from;
689 struct passwd * pw = s->pw;
690 pid_t pid = getpid();
693 * Get IP address of client. If the connection is not a socket, let
694 * the address be 0.0.0.0.
696 memset(&from, 0, sizeof(from));
697 fromlen = sizeof(from);
698 if (packet_connection_is_on_socket()) {
699 if (getpeername(packet_get_connection_in(),
700 (struct sockaddr *) & from, &fromlen) < 0) {
701 debug("getpeername: %.100s", strerror(errno));
706 /* Record that there was a login on that tty from the remote host. */
708 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
709 get_remote_name_or_ip(utmp_len,
711 (struct sockaddr *)&from, fromlen);
715 * If password change is needed, do it now.
716 * This needs to occur before the ~/.hushlogin check.
718 if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) {
721 s->authctxt->force_pwchange = 0;
722 /* XXX - signal [net] parent to enable forwardings */
726 if (check_quietlogin(s, command))
731 #ifndef NO_SSH_LASTLOG
732 if (options.print_lastlog && s->last_login_time != 0) {
733 time_string = ctime(&s->last_login_time);
734 if (strchr(time_string, '\n'))
735 *strchr(time_string, '\n') = 0;
736 if (strcmp(s->hostname, "") == 0)
737 printf("Last login: %s\r\n", time_string);
739 printf("Last login: %s from %s\r\n", time_string,
742 #endif /* NO_SSH_LASTLOG */
748 * Display the message of the day.
756 if (options.print_motd) {
757 #ifdef HAVE_LOGIN_CAP
758 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
761 f = fopen("/etc/motd", "r");
764 while (fgets(buf, sizeof(buf), f))
773 * Check for quiet login, either .hushlogin or command given.
776 check_quietlogin(Session *s, const char *command)
779 struct passwd *pw = s->pw;
782 /* Return 1 if .hushlogin exists or a command given. */
785 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
786 #ifdef HAVE_LOGIN_CAP
787 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
790 if (stat(buf, &st) >= 0)
797 * Sets the value of the given variable in the environment. If the variable
798 * already exists, its value is overriden.
801 child_set_env(char ***envp, u_int *envsizep, const char *name,
809 * If we're passed an uninitialized list, allocate a single null
810 * entry before continuing.
812 if (*envp == NULL && *envsizep == 0) {
813 *envp = xmalloc(sizeof(char *));
819 * Find the slot where the value should be stored. If the variable
820 * already exists, we reuse the slot; otherwise we append a new slot
821 * at the end of the array, expanding if necessary.
824 namelen = strlen(name);
825 for (i = 0; env[i]; i++)
826 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
829 /* Reuse the slot. */
832 /* New variable. Expand if necessary. */
834 if (i >= envsize - 1) {
836 fatal("child_set_env: too many env vars");
838 env = (*envp) = xrealloc(env, envsize * sizeof(char *));
841 /* Need to set the NULL pointer at end of array beyond the new slot. */
845 /* Allocate space and format the variable in the appropriate slot. */
846 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
847 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
851 * Reads environment variables from the given file and adds/overrides them
852 * into the environment. If the file does not exist, this does nothing.
853 * Otherwise, it must consist of empty lines, comments (line starts with '#')
854 * and assignments of the form name=value. No other forms are allowed.
857 read_environment_file(char ***env, u_int *envsize,
858 const char *filename)
865 f = fopen(filename, "r");
869 while (fgets(buf, sizeof(buf), f)) {
871 fatal("Too many lines in environment file %s", filename);
872 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
874 if (!*cp || *cp == '#' || *cp == '\n')
876 if (strchr(cp, '\n'))
877 *strchr(cp, '\n') = '\0';
878 value = strchr(cp, '=');
880 fprintf(stderr, "Bad line %u in %.100s\n", lineno,
885 * Replace the equals sign by nul, and advance value to
890 child_set_env(env, envsize, cp, value);
895 #ifdef HAVE_ETC_DEFAULT_LOGIN
897 * Return named variable from specified environment, or NULL if not present.
900 child_get_env(char **env, const char *name)
906 for (i=0; env[i] != NULL; i++)
907 if (strncmp(name, env[i], len) == 0 && env[i][len] == '=')
908 return(env[i] + len + 1);
913 * Read /etc/default/login.
914 * We pick up the PATH (or SUPATH for root) and UMASK.
917 read_etc_default_login(char ***env, u_int *envsize, uid_t uid)
919 char **tmpenv = NULL, *var;
920 u_int i, tmpenvsize = 0;
924 * We don't want to copy the whole file to the child's environment,
925 * so we use a temporary environment and copy the variables we're
928 read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login");
934 var = child_get_env(tmpenv, "SUPATH");
936 var = child_get_env(tmpenv, "PATH");
938 child_set_env(env, envsize, "PATH", var);
940 if ((var = child_get_env(tmpenv, "UMASK")) != NULL)
941 if (sscanf(var, "%5lo", &mask) == 1)
944 for (i = 0; tmpenv[i] != NULL; i++)
948 #endif /* HAVE_ETC_DEFAULT_LOGIN */
950 void copy_environment(char **source, char ***env, u_int *envsize)
952 char *var_name, *var_val;
958 for(i = 0; source[i] != NULL; i++) {
959 var_name = xstrdup(source[i]);
960 if ((var_val = strstr(var_name, "=")) == NULL) {
966 debug3("Copy environment: %s=%s", var_name, var_val);
967 child_set_env(env, envsize, var_name, var_val);
974 do_setup_env(Session *s, const char *shell)
978 char **env, *laddr, *path = NULL;
979 struct passwd *pw = s->pw;
981 /* Initialize the environment. */
983 env = xmalloc(envsize * sizeof(char *));
988 * The Windows environment contains some setting which are
989 * important for a running system. They must not be dropped.
991 copy_environment(environ, &env, &envsize);
995 /* Allow any GSSAPI methods that we've used to alter
996 * the childs environment as they see fit
998 ssh_gssapi_do_child(&env, &envsize);
1001 if (!options.use_login) {
1002 /* Set basic environment. */
1003 for (i = 0; i < s->num_env; i++)
1004 child_set_env(&env, &envsize, s->env[i].name,
1007 child_set_env(&env, &envsize, "USER", pw->pw_name);
1008 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
1010 child_set_env(&env, &envsize, "LOGIN", pw->pw_name);
1012 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
1013 #ifdef HAVE_LOGIN_CAP
1014 if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
1015 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1017 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1018 #else /* HAVE_LOGIN_CAP */
1019 # ifndef HAVE_CYGWIN
1021 * There's no standard path on Windows. The path contains
1022 * important components pointing to the system directories,
1023 * needed for loading shared libraries. So the path better
1024 * remains intact here.
1026 # ifdef HAVE_ETC_DEFAULT_LOGIN
1027 read_etc_default_login(&env, &envsize, pw->pw_uid);
1028 path = child_get_env(env, "PATH");
1029 # endif /* HAVE_ETC_DEFAULT_LOGIN */
1030 if (path == NULL || *path == '\0') {
1031 child_set_env(&env, &envsize, "PATH",
1032 s->pw->pw_uid == 0 ?
1033 SUPERUSER_PATH : _PATH_STDPATH);
1035 # endif /* HAVE_CYGWIN */
1036 #endif /* HAVE_LOGIN_CAP */
1038 snprintf(buf, sizeof buf, "%.200s/%.50s",
1039 _PATH_MAILDIR, pw->pw_name);
1040 child_set_env(&env, &envsize, "MAIL", buf);
1042 /* Normal systems set SHELL by default. */
1043 child_set_env(&env, &envsize, "SHELL", shell);
1046 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1048 /* Set custom environment options from RSA authentication. */
1049 if (!options.use_login) {
1050 while (custom_environment) {
1051 struct envstring *ce = custom_environment;
1054 for (i = 0; str[i] != '=' && str[i]; i++)
1056 if (str[i] == '=') {
1058 child_set_env(&env, &envsize, str, str + i + 1);
1060 custom_environment = ce->next;
1066 /* SSH_CLIENT deprecated */
1067 snprintf(buf, sizeof buf, "%.50s %d %d",
1068 get_remote_ipaddr(), get_remote_port(), get_local_port());
1069 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1071 laddr = get_local_ipaddr(packet_get_connection_in());
1072 snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1073 get_remote_ipaddr(), get_remote_port(), laddr, get_local_port());
1075 child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1078 child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1080 child_set_env(&env, &envsize, "TERM", s->term);
1082 child_set_env(&env, &envsize, "DISPLAY", s->display);
1083 if (original_command)
1084 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1088 if (cray_tmpdir[0] != '\0')
1089 child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir);
1090 #endif /* _UNICOS */
1096 if ((cp = getenv("AUTHSTATE")) != NULL)
1097 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1098 if ((cp = getenv("KRB5CCNAME")) != NULL)
1099 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1100 read_environment_file(&env, &envsize, "/etc/environment");
1104 if (s->authctxt->krb5_ccname)
1105 child_set_env(&env, &envsize, "KRB5CCNAME",
1106 s->authctxt->krb5_ccname);
1110 * Pull in any environment variables that may have
1113 if (options.use_pam) {
1116 p = fetch_pam_child_environment();
1117 copy_environment(p, &env, &envsize);
1118 free_pam_environment(p);
1120 p = fetch_pam_environment();
1121 copy_environment(p, &env, &envsize);
1122 free_pam_environment(p);
1124 #endif /* USE_PAM */
1126 if (auth_sock_name != NULL)
1127 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1130 /* read $HOME/.ssh/environment. */
1131 if (options.permit_user_env && !options.use_login) {
1132 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1133 strcmp(pw->pw_dir, "/") ? pw->pw_dir : "");
1134 read_environment_file(&env, &envsize, buf);
1137 /* dump the environment */
1138 fprintf(stderr, "Environment:\n");
1139 for (i = 0; env[i]; i++)
1140 fprintf(stderr, " %.200s\n", env[i]);
1146 * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
1147 * first in this order).
1150 do_rc_files(Session *s, const char *shell)
1158 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
1160 /* ignore _PATH_SSH_USER_RC for subsystems */
1161 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
1162 snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
1163 shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
1165 fprintf(stderr, "Running %s\n", cmd);
1166 f = popen(cmd, "w");
1169 fprintf(f, "%s %s\n", s->auth_proto,
1173 fprintf(stderr, "Could not run %s\n",
1175 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
1177 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
1178 _PATH_SSH_SYSTEM_RC);
1179 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
1182 fprintf(f, "%s %s\n", s->auth_proto,
1186 fprintf(stderr, "Could not run %s\n",
1187 _PATH_SSH_SYSTEM_RC);
1188 } else if (do_xauth && options.xauth_location != NULL) {
1189 /* Add authority data to .Xauthority if appropriate. */
1192 "Running %.500s remove %.100s\n",
1193 options.xauth_location, s->auth_display);
1195 "%.500s add %.100s %.100s %.100s\n",
1196 options.xauth_location, s->auth_display,
1197 s->auth_proto, s->auth_data);
1199 snprintf(cmd, sizeof cmd, "%s -q -",
1200 options.xauth_location);
1201 f = popen(cmd, "w");
1203 fprintf(f, "remove %s\n",
1205 fprintf(f, "add %s %s %s\n",
1206 s->auth_display, s->auth_proto,
1210 fprintf(stderr, "Could not run %s\n",
1217 do_nologin(struct passwd *pw)
1222 #ifdef HAVE_LOGIN_CAP
1223 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1224 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1225 _PATH_NOLOGIN), "r");
1228 f = fopen(_PATH_NOLOGIN, "r");
1231 /* /etc/nologin exists. Print its contents and exit. */
1232 logit("User %.100s not allowed because %s exists",
1233 pw->pw_name, _PATH_NOLOGIN);
1234 while (fgets(buf, sizeof(buf), f))
1242 /* Set login name, uid, gid, and groups. */
1244 do_setusercontext(struct passwd *pw)
1247 if (getuid() == 0 || geteuid() == 0)
1248 #endif /* HAVE_CYGWIN */
1251 #ifdef HAVE_SETPCRED
1252 if (setpcred(pw->pw_name, (char **)NULL) == -1)
1253 fatal("Failed to set process credentials");
1254 #endif /* HAVE_SETPCRED */
1255 #ifdef HAVE_LOGIN_CAP
1260 if (options.use_pam) {
1264 # endif /* USE_PAM */
1265 if (setusercontext(lc, pw, pw->pw_uid,
1266 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1267 perror("unable to set user context");
1271 # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
1272 /* Sets login uid for accounting */
1273 if (getluid() == -1 && setluid(pw->pw_uid) == -1)
1274 error("setluid: %s", strerror(errno));
1275 # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
1277 if (setlogin(pw->pw_name) < 0)
1278 error("setlogin failed: %s", strerror(errno));
1279 if (setgid(pw->pw_gid) < 0) {
1283 /* Initialize the group list. */
1284 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1285 perror("initgroups");
1291 * PAM credentials may take the form of supplementary groups.
1292 * These will have been wiped by the above initgroups() call.
1293 * Reestablish them here.
1295 if (options.use_pam) {
1299 # endif /* USE_PAM */
1300 # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
1301 irix_setusercontext(pw);
1302 # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
1306 /* Permanently switch to the desired uid. */
1307 permanently_set_uid(pw);
1314 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1315 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1319 do_pwchange(Session *s)
1321 fprintf(stderr, "WARNING: Your password has expired.\n");
1322 if (s->ttyfd != -1) {
1324 "You must change your password now and login again!\n");
1325 execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
1329 "Password change required but no TTY available.\n");
1335 launch_login(struct passwd *pw, const char *hostname)
1337 /* Launch login(1). */
1339 execl(LOGIN_PROGRAM, "login", "-h", hostname,
1340 #ifdef xxxLOGIN_NEEDS_TERM
1341 (s->term ? s->term : "unknown"),
1342 #endif /* LOGIN_NEEDS_TERM */
1343 #ifdef LOGIN_NO_ENDOPT
1344 "-p", "-f", pw->pw_name, (char *)NULL);
1346 "-p", "-f", "--", pw->pw_name, (char *)NULL);
1349 /* Login couldn't be executed, die. */
1356 child_close_fds(void)
1360 if (packet_get_connection_in() == packet_get_connection_out())
1361 close(packet_get_connection_in());
1363 close(packet_get_connection_in());
1364 close(packet_get_connection_out());
1367 * Close all descriptors related to channels. They will still remain
1368 * open in the parent.
1370 /* XXX better use close-on-exec? -markus */
1371 channel_close_all();
1374 * Close any extra file descriptors. Note that there may still be
1375 * descriptors left by system functions. They will be closed later.
1380 * Close any extra open file descriptors so that we don\'t have them
1381 * hanging around in clients. Note that we want to do this after
1382 * initgroups, because at least on Solaris 2.3 it leaves file
1385 for (i = 3; i < 64; i++)
1390 * Performs common processing for the child, such as setting up the
1391 * environment, closing extra file descriptors, setting the user and group
1392 * ids, and executing the command or shell.
1395 do_child(Session *s, const char *command)
1397 extern char **environ;
1400 const char *shell, *shell0, *hostname = NULL;
1401 struct passwd *pw = s->pw;
1403 /* remove hostkey from the child's memory */
1404 destroy_sensitive_data();
1406 /* Force a password change */
1407 if (s->authctxt->force_pwchange) {
1408 do_setusercontext(pw);
1414 /* login(1) is only called if we execute the login shell */
1415 if (options.use_login && command != NULL)
1416 options.use_login = 0;
1419 cray_setup(pw->pw_uid, pw->pw_name, command);
1420 #endif /* _UNICOS */
1423 * Login(1) does this as well, and it needs uid 0 for the "-h"
1424 * switch, so we let login(1) to this for us.
1426 if (!options.use_login) {
1428 session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty);
1429 if (!check_quietlogin(s, command))
1431 #else /* HAVE_OSF_SIA */
1433 do_setusercontext(pw);
1435 * PAM session modules in do_setusercontext may have
1436 * generated messages, so if this in an interactive
1437 * login then display them too.
1439 if (command == NULL)
1441 #endif /* HAVE_OSF_SIA */
1445 * Get the shell from the password data. An empty shell field is
1446 * legal, and means /bin/sh.
1448 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1451 * Make sure $SHELL points to the shell from the password file,
1452 * even if shell is overridden from login.conf
1454 env = do_setup_env(s, shell);
1456 #ifdef HAVE_LOGIN_CAP
1457 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1460 /* we have to stash the hostname before we close our socket. */
1461 if (options.use_login)
1462 hostname = get_remote_name_or_ip(utmp_len,
1465 * Close the connection descriptors; note that this is the child, and
1466 * the server will still have the socket open, and it is important
1467 * that we do not shutdown it. Note that the descriptors cannot be
1468 * closed before building the environment, as we call
1469 * get_remote_ipaddr there.
1474 * Must take new environment into use so that .ssh/rc,
1475 * /etc/ssh/sshrc and xauth are run in the proper environment.
1479 #if defined(KRB5) && defined(USE_AFS)
1481 * At this point, we check to see if AFS is active and if we have
1482 * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1483 * if we can (and need to) extend the ticket into an AFS token. If
1484 * we don't do this, we run into potential problems if the user's
1485 * home directory is in AFS and it's not world-readable.
1488 if (options.kerberos_get_afs_token && k_hasafs() &&
1489 (s->authctxt->krb5_ctx != NULL)) {
1492 debug("Getting AFS token");
1496 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1497 krb5_afslog(s->authctxt->krb5_ctx,
1498 s->authctxt->krb5_fwd_ccache, cell, NULL);
1500 krb5_afslog_home(s->authctxt->krb5_ctx,
1501 s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1505 /* Change current directory to the user\'s home directory. */
1506 if (chdir(pw->pw_dir) < 0) {
1507 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1508 pw->pw_dir, strerror(errno));
1509 #ifdef HAVE_LOGIN_CAP
1510 if (login_getcapbool(lc, "requirehome", 0))
1515 if (!options.use_login)
1516 do_rc_files(s, shell);
1518 /* restore SIGPIPE for child */
1519 signal(SIGPIPE, SIG_DFL);
1521 if (options.use_login) {
1522 launch_login(pw, hostname);
1526 /* Get the last component of the shell name. */
1527 if ((shell0 = strrchr(shell, '/')) != NULL)
1533 * If we have no command, execute the shell. In this case, the shell
1534 * name to be passed in argv[0] is preceded by '-' to indicate that
1535 * this is a login shell.
1540 /* Start the shell. Set initial character to '-'. */
1543 if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1544 >= sizeof(argv0) - 1) {
1550 /* Execute the shell. */
1553 execve(shell, argv, env);
1555 /* Executing the shell failed. */
1560 * Execute the command using the user's shell. This uses the -c
1561 * option to execute the command.
1563 argv[0] = (char *) shell0;
1565 argv[2] = (char *) command;
1567 execve(shell, argv, env);
1576 static int did_init = 0;
1578 debug("session_new: init");
1579 for (i = 0; i < MAX_SESSIONS; i++) {
1580 sessions[i].used = 0;
1584 for (i = 0; i < MAX_SESSIONS; i++) {
1585 Session *s = &sessions[i];
1587 memset(s, 0, sizeof(*s));
1593 debug("session_new: session %d", i);
1604 for (i = 0; i < MAX_SESSIONS; i++) {
1605 Session *s = &sessions[i];
1606 debug("dump: used %d session %d %p channel %d pid %ld",
1616 session_open(Authctxt *authctxt, int chanid)
1618 Session *s = session_new();
1619 debug("session_open: channel %d", chanid);
1621 error("no more sessions");
1624 s->authctxt = authctxt;
1625 s->pw = authctxt->pw;
1626 if (s->pw == NULL || !authctxt->valid)
1627 fatal("no user for session %d", s->self);
1628 debug("session_open: session %d: link with channel %d", s->self, chanid);
1634 session_by_tty(char *tty)
1637 for (i = 0; i < MAX_SESSIONS; i++) {
1638 Session *s = &sessions[i];
1639 if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1640 debug("session_by_tty: session %d tty %s", i, tty);
1644 debug("session_by_tty: unknown tty %.100s", tty);
1650 session_by_channel(int id)
1653 for (i = 0; i < MAX_SESSIONS; i++) {
1654 Session *s = &sessions[i];
1655 if (s->used && s->chanid == id) {
1656 debug("session_by_channel: session %d channel %d", i, id);
1660 debug("session_by_channel: unknown channel %d", id);
1666 session_by_pid(pid_t pid)
1669 debug("session_by_pid: pid %ld", (long)pid);
1670 for (i = 0; i < MAX_SESSIONS; i++) {
1671 Session *s = &sessions[i];
1672 if (s->used && s->pid == pid)
1675 error("session_by_pid: unknown pid %ld", (long)pid);
1681 session_window_change_req(Session *s)
1683 s->col = packet_get_int();
1684 s->row = packet_get_int();
1685 s->xpixel = packet_get_int();
1686 s->ypixel = packet_get_int();
1688 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1693 session_pty_req(Session *s)
1699 debug("Allocating a pty not permitted for this authentication.");
1702 if (s->ttyfd != -1) {
1703 packet_disconnect("Protocol error: you already have a pty.");
1706 /* Get the time and hostname when the user last logged in. */
1707 if (options.print_lastlog) {
1708 s->hostname[0] = '\0';
1709 s->last_login_time = get_last_login_time(s->pw->pw_uid,
1710 s->pw->pw_name, s->hostname, sizeof(s->hostname));
1713 s->term = packet_get_string(&len);
1716 s->col = packet_get_int();
1717 s->row = packet_get_int();
1719 s->row = packet_get_int();
1720 s->col = packet_get_int();
1722 s->xpixel = packet_get_int();
1723 s->ypixel = packet_get_int();
1725 if (strcmp(s->term, "") == 0) {
1730 /* Allocate a pty and open it. */
1731 debug("Allocating pty.");
1732 if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
1738 error("session_pty_req: session %d alloc failed", s->self);
1741 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1743 /* for SSH1 the tty modes length is not given */
1745 n_bytes = packet_remaining();
1746 tty_parse_modes(s->ttyfd, &n_bytes);
1749 pty_setowner(s->pw, s->tty);
1751 /* Set window size from the packet. */
1752 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1755 session_proctitle(s);
1760 session_subsystem_req(Session *s)
1765 char *cmd, *subsys = packet_get_string(&len);
1769 logit("subsystem request for %.100s", subsys);
1771 for (i = 0; i < options.num_subsystems; i++) {
1772 if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1773 cmd = options.subsystem_command[i];
1774 if (stat(cmd, &st) < 0) {
1775 error("subsystem: cannot stat %s: %s", cmd,
1779 debug("subsystem: exec() %s", cmd);
1780 s->is_subsystem = 1;
1788 logit("subsystem request for %.100s failed, subsystem not found",
1796 session_x11_req(Session *s)
1800 s->single_connection = packet_get_char();
1801 s->auth_proto = packet_get_string(NULL);
1802 s->auth_data = packet_get_string(NULL);
1803 s->screen = packet_get_int();
1806 success = session_setup_x11fwd(s);
1808 xfree(s->auth_proto);
1809 xfree(s->auth_data);
1810 s->auth_proto = NULL;
1811 s->auth_data = NULL;
1817 session_shell_req(Session *s)
1825 session_exec_req(Session *s)
1828 char *command = packet_get_string(&len);
1830 do_exec(s, command);
1836 session_break_req(Session *s)
1839 packet_get_int(); /* ignored */
1842 if (s->ttyfd == -1 ||
1843 tcsendbreak(s->ttyfd, 0) < 0)
1849 session_env_req(Session *s)
1852 u_int name_len, val_len, i;
1854 name = packet_get_string(&name_len);
1855 val = packet_get_string(&val_len);
1858 /* Don't set too many environment variables */
1859 if (s->num_env > 128) {
1860 debug2("Ignoring env request %s: too many env vars", name);
1864 for (i = 0; i < options.num_accept_env; i++) {
1865 if (match_pattern(name, options.accept_env[i])) {
1866 debug2("Setting env %d: %s=%s", s->num_env, name, val);
1867 s->env = xrealloc(s->env, sizeof(*s->env) *
1869 s->env[s->num_env].name = name;
1870 s->env[s->num_env].val = val;
1875 debug2("Ignoring env request %s: disallowed name", name);
1884 session_auth_agent_req(Session *s)
1886 static int called = 0;
1888 if (no_agent_forwarding_flag) {
1889 debug("session_auth_agent_req: no_agent_forwarding_flag");
1896 return auth_input_request_forwarding(s->pw);
1901 session_input_channel_req(Channel *c, const char *rtype)
1906 if ((s = session_by_channel(c->self)) == NULL) {
1907 logit("session_input_channel_req: no session %d req %.100s",
1911 debug("session_input_channel_req: session %d req %s", s->self, rtype);
1914 * a session is in LARVAL state until a shell, a command
1915 * or a subsystem is executed
1917 if (c->type == SSH_CHANNEL_LARVAL) {
1918 if (strcmp(rtype, "shell") == 0) {
1919 success = session_shell_req(s);
1920 } else if (strcmp(rtype, "exec") == 0) {
1921 success = session_exec_req(s);
1922 } else if (strcmp(rtype, "pty-req") == 0) {
1923 success = session_pty_req(s);
1924 } else if (strcmp(rtype, "x11-req") == 0) {
1925 success = session_x11_req(s);
1926 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1927 success = session_auth_agent_req(s);
1928 } else if (strcmp(rtype, "subsystem") == 0) {
1929 success = session_subsystem_req(s);
1930 } else if (strcmp(rtype, "env") == 0) {
1931 success = session_env_req(s);
1934 if (strcmp(rtype, "window-change") == 0) {
1935 success = session_window_change_req(s);
1936 } else if (strcmp(rtype, "break") == 0) {
1937 success = session_break_req(s);
1944 session_set_fds(Session *s, int fdin, int fdout, int fderr)
1947 fatal("session_set_fds: called for proto != 2.0");
1949 * now that have a child and a pipe to the child,
1950 * we can activate our channel and register the fd's
1952 if (s->chanid == -1)
1953 fatal("no channel for session %d", s->self);
1954 channel_set_fds(s->chanid,
1956 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1958 CHAN_SES_WINDOW_DEFAULT);
1962 * Function to perform pty cleanup. Also called if we get aborted abnormally
1963 * (e.g., due to a dropped connection).
1966 session_pty_cleanup2(Session *s)
1969 error("session_pty_cleanup: no session");
1975 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1977 /* Record that the user has logged out. */
1979 record_logout(s->pid, s->tty, s->pw->pw_name);
1981 /* Release the pseudo-tty. */
1983 pty_release(s->tty);
1986 * Close the server side of the socket pairs. We must do this after
1987 * the pty cleanup, so that another process doesn't get this pty
1988 * while we're still cleaning up.
1990 if (close(s->ptymaster) < 0)
1991 error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
1993 /* unlink pty from session */
1998 session_pty_cleanup(Session *s)
2000 PRIVSEP(session_pty_cleanup2(s));
2006 #define SSH_SIG(x) if (sig == SIG ## x) return #x
2021 return "SIG@openssh.com";
2025 session_exit_message(Session *s, int status)
2029 if ((c = channel_lookup(s->chanid)) == NULL)
2030 fatal("session_exit_message: session %d: no channel %d",
2031 s->self, s->chanid);
2032 debug("session_exit_message: session %d channel %d pid %ld",
2033 s->self, s->chanid, (long)s->pid);
2035 if (WIFEXITED(status)) {
2036 channel_request_start(s->chanid, "exit-status", 0);
2037 packet_put_int(WEXITSTATUS(status));
2039 } else if (WIFSIGNALED(status)) {
2040 channel_request_start(s->chanid, "exit-signal", 0);
2041 packet_put_cstring(sig2name(WTERMSIG(status)));
2043 packet_put_char(WCOREDUMP(status));
2044 #else /* WCOREDUMP */
2046 #endif /* WCOREDUMP */
2047 packet_put_cstring("");
2048 packet_put_cstring("");
2051 /* Some weird exit cause. Just exit. */
2052 packet_disconnect("wait returned status %04x.", status);
2055 /* disconnect channel */
2056 debug("session_exit_message: release channel %d", s->chanid);
2057 channel_cancel_cleanup(s->chanid);
2059 * emulate a write failure with 'chan_write_failed', nobody will be
2060 * interested in data we write.
2061 * Note that we must not call 'chan_read_failed', since there could
2062 * be some more data waiting in the pipe.
2064 if (c->ostate != CHAN_OUTPUT_CLOSED)
2065 chan_write_failed(c);
2070 session_close(Session *s)
2074 debug("session_close: session %d pid %ld", s->self, (long)s->pid);
2076 session_pty_cleanup(s);
2081 if (s->auth_display)
2082 xfree(s->auth_display);
2084 xfree(s->auth_data);
2086 xfree(s->auth_proto);
2088 for (i = 0; i < s->num_env; i++) {
2089 xfree(s->env[i].name);
2090 xfree(s->env[i].val);
2094 session_proctitle(s);
2098 session_close_by_pid(pid_t pid, int status)
2100 Session *s = session_by_pid(pid);
2102 debug("session_close_by_pid: no session for pid %ld",
2106 if (s->chanid != -1)
2107 session_exit_message(s, status);
2112 * this is called when a channel dies before
2113 * the session 'child' itself dies
2116 session_close_by_channel(int id, void *arg)
2118 Session *s = session_by_channel(id);
2120 debug("session_close_by_channel: no session for id %d", id);
2123 debug("session_close_by_channel: channel %d child %ld",
2126 debug("session_close_by_channel: channel %d: has child", id);
2128 * delay detach of session, but release pty, since
2129 * the fd's to the child are already closed
2132 session_pty_cleanup(s);
2135 /* detach by removing callback */
2136 channel_cancel_cleanup(s->chanid);
2142 session_destroy_all(void (*closefunc)(Session *))
2145 for (i = 0; i < MAX_SESSIONS; i++) {
2146 Session *s = &sessions[i];
2148 if (closefunc != NULL)
2157 session_tty_list(void)
2159 static char buf[1024];
2164 for (i = 0; i < MAX_SESSIONS; i++) {
2165 Session *s = &sessions[i];
2166 if (s->used && s->ttyfd != -1) {
2168 if (strncmp(s->tty, "/dev/", 5) != 0) {
2169 cp = strrchr(s->tty, '/');
2170 cp = (cp == NULL) ? s->tty : cp + 1;
2175 strlcat(buf, ",", sizeof buf);
2176 strlcat(buf, cp, sizeof buf);
2180 strlcpy(buf, "notty", sizeof buf);
2185 session_proctitle(Session *s)
2188 error("no user for session %d", s->self);
2190 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
2194 session_setup_x11fwd(Session *s)
2197 char display[512], auth_display[512];
2198 char hostname[MAXHOSTNAMELEN];
2200 if (no_x11_forwarding_flag) {
2201 packet_send_debug("X11 forwarding disabled in user configuration file.");
2204 if (!options.x11_forwarding) {
2205 debug("X11 forwarding disabled in server configuration file.");
2208 if (!options.xauth_location ||
2209 (stat(options.xauth_location, &st) == -1)) {
2210 packet_send_debug("No xauth program; cannot forward with spoofing.");
2213 if (options.use_login) {
2214 packet_send_debug("X11 forwarding disabled; "
2215 "not compatible with UseLogin=yes.");
2218 if (s->display != NULL) {
2219 debug("X11 display already set.");
2222 if (x11_create_display_inet(options.x11_display_offset,
2223 options.x11_use_localhost, s->single_connection,
2224 &s->display_number) == -1) {
2225 debug("x11_create_display_inet failed.");
2229 /* Set up a suitable value for the DISPLAY variable. */
2230 if (gethostname(hostname, sizeof(hostname)) < 0)
2231 fatal("gethostname: %.100s", strerror(errno));
2233 * auth_display must be used as the displayname when the
2234 * authorization entry is added with xauth(1). This will be
2235 * different than the DISPLAY string for localhost displays.
2237 if (options.x11_use_localhost) {
2238 snprintf(display, sizeof display, "localhost:%u.%u",
2239 s->display_number, s->screen);
2240 snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
2241 s->display_number, s->screen);
2242 s->display = xstrdup(display);
2243 s->auth_display = xstrdup(auth_display);
2245 #ifdef IPADDR_IN_DISPLAY
2247 struct in_addr my_addr;
2249 he = gethostbyname(hostname);
2251 error("Can't get IP address for X11 DISPLAY.");
2252 packet_send_debug("Can't get IP address for X11 DISPLAY.");
2255 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
2256 snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr),
2257 s->display_number, s->screen);
2259 snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
2260 s->display_number, s->screen);
2262 s->display = xstrdup(display);
2263 s->auth_display = xstrdup(display);
2270 do_authenticated2(Authctxt *authctxt)
2272 server_loop2(authctxt);
2276 do_cleanup(Authctxt *authctxt)
2278 static int called = 0;
2280 debug("do_cleanup");
2282 /* no cleanup if we're in the child for login shell */
2286 /* avoid double cleanup */
2291 if (authctxt == NULL)
2294 if (options.kerberos_ticket_cleanup &&
2296 krb5_cleanup_proc(authctxt);
2300 if (compat20 && options.gss_cleanup_creds)
2301 ssh_gssapi_cleanup_creds();
2305 if (options.use_pam) {
2307 sshpam_thread_cleanup();
2311 /* remove agent socket */
2312 auth_sock_cleanup_proc(authctxt->pw);
2315 * Cleanup ptys/utmp only if privsep is disabled,
2316 * or if running in monitor.
2318 if (!use_privsep || mm_is_monitor())
2319 session_destroy_all(session_pty_cleanup2);