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 1.175 2004/05/11 19:01:43 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 session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]);
486 /* Enter the interactive session. */
487 server_loop(pid, pin[1], pout[0], perr[0]);
488 /* server_loop has closed pin[1], pout[0], and perr[0]. */
490 #else /* USE_PIPES */
491 /* We are the parent. Close the child sides of the socket pairs. */
496 * Clear loginmsg, since it's the child's responsibility to display
497 * it to the user, otherwise multiple sessions may accumulate
498 * multiple copies of the login messages.
500 buffer_clear(&loginmsg);
503 * Enter the interactive session. Note: server_loop must be able to
504 * handle the case that fdin and fdout are the same.
507 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
509 server_loop(pid, inout[1], inout[1], err[1]);
510 /* server_loop has closed inout[1] and err[1]. */
512 #endif /* USE_PIPES */
516 * This is called to fork and execute a command when we have a tty. This
517 * will call do_child from the child, and server_loop from the parent after
518 * setting up file descriptors, controlling tty, updating wtmp, utmp,
519 * lastlog, and other such operations.
522 do_exec_pty(Session *s, const char *command)
524 int fdout, ptyfd, ttyfd, ptymaster;
528 fatal("do_exec_pty: no session");
533 if (options.use_pam) {
534 do_pam_set_tty(s->tty);
540 /* Fork the child. */
541 if ((pid = fork()) == 0) {
544 /* Child. Reinitialize the log because the pid has changed. */
545 log_init(__progname, options.log_level, options.log_facility, log_stderr);
546 /* Close the master side of the pseudo tty. */
549 /* Make the pseudo tty our controlling tty. */
550 pty_make_controlling_tty(&ttyfd, s->tty);
552 /* Redirect stdin/stdout/stderr from the pseudo tty. */
553 if (dup2(ttyfd, 0) < 0)
554 error("dup2 stdin: %s", strerror(errno));
555 if (dup2(ttyfd, 1) < 0)
556 error("dup2 stdout: %s", strerror(errno));
557 if (dup2(ttyfd, 2) < 0)
558 error("dup2 stderr: %s", strerror(errno));
560 /* Close the extra descriptor for the pseudo tty. */
563 /* record login, etc. similar to login(1) */
565 if (!(options.use_login && command == NULL)) {
567 cray_init_job(s->pw); /* set up cray jid and tmpdir */
569 do_login(s, command);
571 # ifdef LOGIN_NEEDS_UTMPX
577 /* Do common processing for the child, such as execing the command. */
578 do_child(s, command);
582 signal(WJSIGNAL, cray_job_termination_handler);
586 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
589 packet_disconnect("fork failed: %.100s", strerror(errno));
592 /* Parent. Close the slave side of the pseudo tty. */
596 * Create another descriptor of the pty master side for use as the
597 * standard input. We could use the original descriptor, but this
598 * simplifies code in server_loop. The descriptor is bidirectional.
602 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
604 /* we keep a reference to the pty master */
605 ptymaster = dup(ptyfd);
607 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
608 s->ptymaster = ptymaster;
610 /* Enter interactive session. */
611 packet_set_interactive(1);
613 session_set_fds(s, ptyfd, fdout, -1);
615 server_loop(pid, ptyfd, fdout, -1);
616 /* server_loop _has_ closed ptyfd and fdout. */
620 #ifdef LOGIN_NEEDS_UTMPX
622 do_pre_login(Session *s)
625 struct sockaddr_storage from;
626 pid_t pid = getpid();
629 * Get IP address of client. If the connection is not a socket, let
630 * the address be 0.0.0.0.
632 memset(&from, 0, sizeof(from));
633 fromlen = sizeof(from);
634 if (packet_connection_is_on_socket()) {
635 if (getpeername(packet_get_connection_in(),
636 (struct sockaddr *) & from, &fromlen) < 0) {
637 debug("getpeername: %.100s", strerror(errno));
642 record_utmp_only(pid, s->tty, s->pw->pw_name,
643 get_remote_name_or_ip(utmp_len, options.use_dns),
644 (struct sockaddr *)&from, fromlen);
649 * This is called to fork and execute a command. If another command is
650 * to be forced, execute that instead.
653 do_exec(Session *s, const char *command)
655 if (forced_command) {
656 original_command = command;
657 command = forced_command;
658 debug("Forced command '%.900s'", command);
662 if (options.gss_authentication) {
663 temporarily_use_uid(s->pw);
664 ssh_gssapi_storecreds();
670 do_exec_pty(s, command);
672 do_exec_no_pty(s, command);
674 original_command = NULL;
678 /* administrative, login(1)-like work */
680 do_login(Session *s, const char *command)
684 struct sockaddr_storage from;
685 struct passwd * pw = s->pw;
686 pid_t pid = getpid();
689 * Get IP address of client. If the connection is not a socket, let
690 * the address be 0.0.0.0.
692 memset(&from, 0, sizeof(from));
693 fromlen = sizeof(from);
694 if (packet_connection_is_on_socket()) {
695 if (getpeername(packet_get_connection_in(),
696 (struct sockaddr *) & from, &fromlen) < 0) {
697 debug("getpeername: %.100s", strerror(errno));
702 /* Record that there was a login on that tty from the remote host. */
704 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
705 get_remote_name_or_ip(utmp_len,
707 (struct sockaddr *)&from, fromlen);
711 * If password change is needed, do it now.
712 * This needs to occur before the ~/.hushlogin check.
714 if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) {
717 s->authctxt->force_pwchange = 0;
718 /* XXX - signal [net] parent to enable forwardings */
722 if (check_quietlogin(s, command))
727 #ifndef NO_SSH_LASTLOG
728 if (options.print_lastlog && s->last_login_time != 0) {
729 time_string = ctime(&s->last_login_time);
730 if (strchr(time_string, '\n'))
731 *strchr(time_string, '\n') = 0;
732 if (strcmp(s->hostname, "") == 0)
733 printf("Last login: %s\r\n", time_string);
735 printf("Last login: %s from %s\r\n", time_string,
738 #endif /* NO_SSH_LASTLOG */
744 * Display the message of the day.
752 if (options.print_motd) {
753 #ifdef HAVE_LOGIN_CAP
754 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
757 f = fopen("/etc/motd", "r");
760 while (fgets(buf, sizeof(buf), f))
769 * Check for quiet login, either .hushlogin or command given.
772 check_quietlogin(Session *s, const char *command)
775 struct passwd *pw = s->pw;
778 /* Return 1 if .hushlogin exists or a command given. */
781 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
782 #ifdef HAVE_LOGIN_CAP
783 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
786 if (stat(buf, &st) >= 0)
793 * Sets the value of the given variable in the environment. If the variable
794 * already exists, its value is overriden.
797 child_set_env(char ***envp, u_int *envsizep, const char *name,
805 * If we're passed an uninitialized list, allocate a single null
806 * entry before continuing.
808 if (*envp == NULL && *envsizep == 0) {
809 *envp = xmalloc(sizeof(char *));
815 * Find the slot where the value should be stored. If the variable
816 * already exists, we reuse the slot; otherwise we append a new slot
817 * at the end of the array, expanding if necessary.
820 namelen = strlen(name);
821 for (i = 0; env[i]; i++)
822 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
825 /* Reuse the slot. */
828 /* New variable. Expand if necessary. */
830 if (i >= envsize - 1) {
832 fatal("child_set_env: too many env vars");
834 env = (*envp) = xrealloc(env, envsize * sizeof(char *));
837 /* Need to set the NULL pointer at end of array beyond the new slot. */
841 /* Allocate space and format the variable in the appropriate slot. */
842 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
843 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
847 * Reads environment variables from the given file and adds/overrides them
848 * into the environment. If the file does not exist, this does nothing.
849 * Otherwise, it must consist of empty lines, comments (line starts with '#')
850 * and assignments of the form name=value. No other forms are allowed.
853 read_environment_file(char ***env, u_int *envsize,
854 const char *filename)
861 f = fopen(filename, "r");
865 while (fgets(buf, sizeof(buf), f)) {
867 fatal("Too many lines in environment file %s", filename);
868 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
870 if (!*cp || *cp == '#' || *cp == '\n')
872 if (strchr(cp, '\n'))
873 *strchr(cp, '\n') = '\0';
874 value = strchr(cp, '=');
876 fprintf(stderr, "Bad line %u in %.100s\n", lineno,
881 * Replace the equals sign by nul, and advance value to
886 child_set_env(env, envsize, cp, value);
891 #ifdef HAVE_ETC_DEFAULT_LOGIN
893 * Return named variable from specified environment, or NULL if not present.
896 child_get_env(char **env, const char *name)
902 for (i=0; env[i] != NULL; i++)
903 if (strncmp(name, env[i], len) == 0 && env[i][len] == '=')
904 return(env[i] + len + 1);
909 * Read /etc/default/login.
910 * We pick up the PATH (or SUPATH for root) and UMASK.
913 read_etc_default_login(char ***env, u_int *envsize, uid_t uid)
915 char **tmpenv = NULL, *var;
916 u_int i, tmpenvsize = 0;
920 * We don't want to copy the whole file to the child's environment,
921 * so we use a temporary environment and copy the variables we're
924 read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login");
930 var = child_get_env(tmpenv, "SUPATH");
932 var = child_get_env(tmpenv, "PATH");
934 child_set_env(env, envsize, "PATH", var);
936 if ((var = child_get_env(tmpenv, "UMASK")) != NULL)
937 if (sscanf(var, "%5lo", &mask) == 1)
940 for (i = 0; tmpenv[i] != NULL; i++)
944 #endif /* HAVE_ETC_DEFAULT_LOGIN */
946 void copy_environment(char **source, char ***env, u_int *envsize)
948 char *var_name, *var_val;
954 for(i = 0; source[i] != NULL; i++) {
955 var_name = xstrdup(source[i]);
956 if ((var_val = strstr(var_name, "=")) == NULL) {
962 debug3("Copy environment: %s=%s", var_name, var_val);
963 child_set_env(env, envsize, var_name, var_val);
970 do_setup_env(Session *s, const char *shell)
974 char **env, *laddr, *path = NULL;
975 struct passwd *pw = s->pw;
977 /* Initialize the environment. */
979 env = xmalloc(envsize * sizeof(char *));
984 * The Windows environment contains some setting which are
985 * important for a running system. They must not be dropped.
987 copy_environment(environ, &env, &envsize);
991 /* Allow any GSSAPI methods that we've used to alter
992 * the childs environment as they see fit
994 ssh_gssapi_do_child(&env, &envsize);
997 if (!options.use_login) {
998 /* Set basic environment. */
999 for (i = 0; i < s->num_env; i++)
1000 child_set_env(&env, &envsize, s->env[i].name,
1003 child_set_env(&env, &envsize, "USER", pw->pw_name);
1004 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
1006 child_set_env(&env, &envsize, "LOGIN", pw->pw_name);
1008 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
1009 #ifdef HAVE_LOGIN_CAP
1010 if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
1011 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1013 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1014 #else /* HAVE_LOGIN_CAP */
1015 # ifndef HAVE_CYGWIN
1017 * There's no standard path on Windows. The path contains
1018 * important components pointing to the system directories,
1019 * needed for loading shared libraries. So the path better
1020 * remains intact here.
1022 # ifdef HAVE_ETC_DEFAULT_LOGIN
1023 read_etc_default_login(&env, &envsize, pw->pw_uid);
1024 path = child_get_env(env, "PATH");
1025 # endif /* HAVE_ETC_DEFAULT_LOGIN */
1026 if (path == NULL || *path == '\0') {
1027 child_set_env(&env, &envsize, "PATH",
1028 s->pw->pw_uid == 0 ?
1029 SUPERUSER_PATH : _PATH_STDPATH);
1031 # endif /* HAVE_CYGWIN */
1032 #endif /* HAVE_LOGIN_CAP */
1034 snprintf(buf, sizeof buf, "%.200s/%.50s",
1035 _PATH_MAILDIR, pw->pw_name);
1036 child_set_env(&env, &envsize, "MAIL", buf);
1038 /* Normal systems set SHELL by default. */
1039 child_set_env(&env, &envsize, "SHELL", shell);
1042 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1044 /* Set custom environment options from RSA authentication. */
1045 if (!options.use_login) {
1046 while (custom_environment) {
1047 struct envstring *ce = custom_environment;
1050 for (i = 0; str[i] != '=' && str[i]; i++)
1052 if (str[i] == '=') {
1054 child_set_env(&env, &envsize, str, str + i + 1);
1056 custom_environment = ce->next;
1062 /* SSH_CLIENT deprecated */
1063 snprintf(buf, sizeof buf, "%.50s %d %d",
1064 get_remote_ipaddr(), get_remote_port(), get_local_port());
1065 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1067 laddr = get_local_ipaddr(packet_get_connection_in());
1068 snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1069 get_remote_ipaddr(), get_remote_port(), laddr, get_local_port());
1071 child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1074 child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1076 child_set_env(&env, &envsize, "TERM", s->term);
1078 child_set_env(&env, &envsize, "DISPLAY", s->display);
1079 if (original_command)
1080 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1084 if (cray_tmpdir[0] != '\0')
1085 child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir);
1086 #endif /* _UNICOS */
1092 if ((cp = getenv("AUTHSTATE")) != NULL)
1093 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1094 if ((cp = getenv("KRB5CCNAME")) != NULL)
1095 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1096 read_environment_file(&env, &envsize, "/etc/environment");
1100 if (s->authctxt->krb5_ccname)
1101 child_set_env(&env, &envsize, "KRB5CCNAME",
1102 s->authctxt->krb5_ccname);
1106 * Pull in any environment variables that may have
1109 if (options.use_pam) {
1112 p = fetch_pam_child_environment();
1113 copy_environment(p, &env, &envsize);
1114 free_pam_environment(p);
1116 p = fetch_pam_environment();
1117 copy_environment(p, &env, &envsize);
1118 free_pam_environment(p);
1120 #endif /* USE_PAM */
1122 if (auth_sock_name != NULL)
1123 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1126 /* read $HOME/.ssh/environment. */
1127 if (options.permit_user_env && !options.use_login) {
1128 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1129 strcmp(pw->pw_dir, "/") ? pw->pw_dir : "");
1130 read_environment_file(&env, &envsize, buf);
1133 /* dump the environment */
1134 fprintf(stderr, "Environment:\n");
1135 for (i = 0; env[i]; i++)
1136 fprintf(stderr, " %.200s\n", env[i]);
1142 * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
1143 * first in this order).
1146 do_rc_files(Session *s, const char *shell)
1154 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
1156 /* ignore _PATH_SSH_USER_RC for subsystems */
1157 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
1158 snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
1159 shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
1161 fprintf(stderr, "Running %s\n", cmd);
1162 f = popen(cmd, "w");
1165 fprintf(f, "%s %s\n", s->auth_proto,
1169 fprintf(stderr, "Could not run %s\n",
1171 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
1173 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
1174 _PATH_SSH_SYSTEM_RC);
1175 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
1178 fprintf(f, "%s %s\n", s->auth_proto,
1182 fprintf(stderr, "Could not run %s\n",
1183 _PATH_SSH_SYSTEM_RC);
1184 } else if (do_xauth && options.xauth_location != NULL) {
1185 /* Add authority data to .Xauthority if appropriate. */
1188 "Running %.500s remove %.100s\n",
1189 options.xauth_location, s->auth_display);
1191 "%.500s add %.100s %.100s %.100s\n",
1192 options.xauth_location, s->auth_display,
1193 s->auth_proto, s->auth_data);
1195 snprintf(cmd, sizeof cmd, "%s -q -",
1196 options.xauth_location);
1197 f = popen(cmd, "w");
1199 fprintf(f, "remove %s\n",
1201 fprintf(f, "add %s %s %s\n",
1202 s->auth_display, s->auth_proto,
1206 fprintf(stderr, "Could not run %s\n",
1213 do_nologin(struct passwd *pw)
1218 #ifdef HAVE_LOGIN_CAP
1219 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1220 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1221 _PATH_NOLOGIN), "r");
1224 f = fopen(_PATH_NOLOGIN, "r");
1227 /* /etc/nologin exists. Print its contents and exit. */
1228 logit("User %.100s not allowed because %s exists",
1229 pw->pw_name, _PATH_NOLOGIN);
1230 while (fgets(buf, sizeof(buf), f))
1238 /* Set login name, uid, gid, and groups. */
1240 do_setusercontext(struct passwd *pw)
1243 if (getuid() == 0 || geteuid() == 0)
1244 #endif /* HAVE_CYGWIN */
1247 #ifdef HAVE_SETPCRED
1248 if (setpcred(pw->pw_name, (char **)NULL) == -1)
1249 fatal("Failed to set process credentials");
1250 #endif /* HAVE_SETPCRED */
1251 #ifdef HAVE_LOGIN_CAP
1256 if (options.use_pam) {
1260 # endif /* USE_PAM */
1261 if (setusercontext(lc, pw, pw->pw_uid,
1262 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1263 perror("unable to set user context");
1267 # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
1268 /* Sets login uid for accounting */
1269 if (getluid() == -1 && setluid(pw->pw_uid) == -1)
1270 error("setluid: %s", strerror(errno));
1271 # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
1273 if (setlogin(pw->pw_name) < 0)
1274 error("setlogin failed: %s", strerror(errno));
1275 if (setgid(pw->pw_gid) < 0) {
1279 /* Initialize the group list. */
1280 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1281 perror("initgroups");
1287 * PAM credentials may take the form of supplementary groups.
1288 * These will have been wiped by the above initgroups() call.
1289 * Reestablish them here.
1291 if (options.use_pam) {
1295 # endif /* USE_PAM */
1296 # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
1297 irix_setusercontext(pw);
1298 # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
1302 /* Permanently switch to the desired uid. */
1303 permanently_set_uid(pw);
1310 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1311 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1315 do_pwchange(Session *s)
1317 fprintf(stderr, "WARNING: Your password has expired.\n");
1318 if (s->ttyfd != -1) {
1320 "You must change your password now and login again!\n");
1321 execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
1325 "Password change required but no TTY available.\n");
1331 launch_login(struct passwd *pw, const char *hostname)
1333 /* Launch login(1). */
1335 execl(LOGIN_PROGRAM, "login", "-h", hostname,
1336 #ifdef xxxLOGIN_NEEDS_TERM
1337 (s->term ? s->term : "unknown"),
1338 #endif /* LOGIN_NEEDS_TERM */
1339 #ifdef LOGIN_NO_ENDOPT
1340 "-p", "-f", pw->pw_name, (char *)NULL);
1342 "-p", "-f", "--", pw->pw_name, (char *)NULL);
1345 /* Login couldn't be executed, die. */
1352 child_close_fds(void)
1356 if (packet_get_connection_in() == packet_get_connection_out())
1357 close(packet_get_connection_in());
1359 close(packet_get_connection_in());
1360 close(packet_get_connection_out());
1363 * Close all descriptors related to channels. They will still remain
1364 * open in the parent.
1366 /* XXX better use close-on-exec? -markus */
1367 channel_close_all();
1370 * Close any extra file descriptors. Note that there may still be
1371 * descriptors left by system functions. They will be closed later.
1376 * Close any extra open file descriptors so that we don\'t have them
1377 * hanging around in clients. Note that we want to do this after
1378 * initgroups, because at least on Solaris 2.3 it leaves file
1381 for (i = 3; i < 64; i++)
1386 * Performs common processing for the child, such as setting up the
1387 * environment, closing extra file descriptors, setting the user and group
1388 * ids, and executing the command or shell.
1391 do_child(Session *s, const char *command)
1393 extern char **environ;
1396 const char *shell, *shell0, *hostname = NULL;
1397 struct passwd *pw = s->pw;
1399 /* remove hostkey from the child's memory */
1400 destroy_sensitive_data();
1402 /* Force a password change */
1403 if (s->authctxt->force_pwchange) {
1404 do_setusercontext(pw);
1410 /* login(1) is only called if we execute the login shell */
1411 if (options.use_login && command != NULL)
1412 options.use_login = 0;
1415 cray_setup(pw->pw_uid, pw->pw_name, command);
1416 #endif /* _UNICOS */
1419 * Login(1) does this as well, and it needs uid 0 for the "-h"
1420 * switch, so we let login(1) to this for us.
1422 if (!options.use_login) {
1424 session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty);
1425 if (!check_quietlogin(s, command))
1427 #else /* HAVE_OSF_SIA */
1429 do_setusercontext(pw);
1430 #endif /* HAVE_OSF_SIA */
1434 * Get the shell from the password data. An empty shell field is
1435 * legal, and means /bin/sh.
1437 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1440 * Make sure $SHELL points to the shell from the password file,
1441 * even if shell is overridden from login.conf
1443 env = do_setup_env(s, shell);
1445 #ifdef HAVE_LOGIN_CAP
1446 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1449 /* we have to stash the hostname before we close our socket. */
1450 if (options.use_login)
1451 hostname = get_remote_name_or_ip(utmp_len,
1454 * Close the connection descriptors; note that this is the child, and
1455 * the server will still have the socket open, and it is important
1456 * that we do not shutdown it. Note that the descriptors cannot be
1457 * closed before building the environment, as we call
1458 * get_remote_ipaddr there.
1463 * Must take new environment into use so that .ssh/rc,
1464 * /etc/ssh/sshrc and xauth are run in the proper environment.
1468 #if defined(KRB5) && defined(USE_AFS)
1470 * At this point, we check to see if AFS is active and if we have
1471 * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1472 * if we can (and need to) extend the ticket into an AFS token. If
1473 * we don't do this, we run into potential problems if the user's
1474 * home directory is in AFS and it's not world-readable.
1477 if (options.kerberos_get_afs_token && k_hasafs() &&
1478 (s->authctxt->krb5_ctx != NULL)) {
1481 debug("Getting AFS token");
1485 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1486 krb5_afslog(s->authctxt->krb5_ctx,
1487 s->authctxt->krb5_fwd_ccache, cell, NULL);
1489 krb5_afslog_home(s->authctxt->krb5_ctx,
1490 s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1494 /* Change current directory to the user\'s home directory. */
1495 if (chdir(pw->pw_dir) < 0) {
1496 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1497 pw->pw_dir, strerror(errno));
1498 #ifdef HAVE_LOGIN_CAP
1499 if (login_getcapbool(lc, "requirehome", 0))
1504 if (!options.use_login)
1505 do_rc_files(s, shell);
1507 /* restore SIGPIPE for child */
1508 signal(SIGPIPE, SIG_DFL);
1510 if (options.use_login) {
1511 launch_login(pw, hostname);
1515 /* Get the last component of the shell name. */
1516 if ((shell0 = strrchr(shell, '/')) != NULL)
1522 * If we have no command, execute the shell. In this case, the shell
1523 * name to be passed in argv[0] is preceded by '-' to indicate that
1524 * this is a login shell.
1529 /* Start the shell. Set initial character to '-'. */
1532 if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1533 >= sizeof(argv0) - 1) {
1539 /* Execute the shell. */
1542 execve(shell, argv, env);
1544 /* Executing the shell failed. */
1549 * Execute the command using the user's shell. This uses the -c
1550 * option to execute the command.
1552 argv[0] = (char *) shell0;
1554 argv[2] = (char *) command;
1556 execve(shell, argv, env);
1565 static int did_init = 0;
1567 debug("session_new: init");
1568 for (i = 0; i < MAX_SESSIONS; i++) {
1569 sessions[i].used = 0;
1573 for (i = 0; i < MAX_SESSIONS; i++) {
1574 Session *s = &sessions[i];
1576 memset(s, 0, sizeof(*s));
1582 debug("session_new: session %d", i);
1593 for (i = 0; i < MAX_SESSIONS; i++) {
1594 Session *s = &sessions[i];
1595 debug("dump: used %d session %d %p channel %d pid %ld",
1605 session_open(Authctxt *authctxt, int chanid)
1607 Session *s = session_new();
1608 debug("session_open: channel %d", chanid);
1610 error("no more sessions");
1613 s->authctxt = authctxt;
1614 s->pw = authctxt->pw;
1615 if (s->pw == NULL || !authctxt->valid)
1616 fatal("no user for session %d", s->self);
1617 debug("session_open: session %d: link with channel %d", s->self, chanid);
1623 session_by_tty(char *tty)
1626 for (i = 0; i < MAX_SESSIONS; i++) {
1627 Session *s = &sessions[i];
1628 if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1629 debug("session_by_tty: session %d tty %s", i, tty);
1633 debug("session_by_tty: unknown tty %.100s", tty);
1639 session_by_channel(int id)
1642 for (i = 0; i < MAX_SESSIONS; i++) {
1643 Session *s = &sessions[i];
1644 if (s->used && s->chanid == id) {
1645 debug("session_by_channel: session %d channel %d", i, id);
1649 debug("session_by_channel: unknown channel %d", id);
1655 session_by_pid(pid_t pid)
1658 debug("session_by_pid: pid %ld", (long)pid);
1659 for (i = 0; i < MAX_SESSIONS; i++) {
1660 Session *s = &sessions[i];
1661 if (s->used && s->pid == pid)
1664 error("session_by_pid: unknown pid %ld", (long)pid);
1670 session_window_change_req(Session *s)
1672 s->col = packet_get_int();
1673 s->row = packet_get_int();
1674 s->xpixel = packet_get_int();
1675 s->ypixel = packet_get_int();
1677 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1682 session_pty_req(Session *s)
1688 debug("Allocating a pty not permitted for this authentication.");
1691 if (s->ttyfd != -1) {
1692 packet_disconnect("Protocol error: you already have a pty.");
1695 /* Get the time and hostname when the user last logged in. */
1696 if (options.print_lastlog) {
1697 s->hostname[0] = '\0';
1698 s->last_login_time = get_last_login_time(s->pw->pw_uid,
1699 s->pw->pw_name, s->hostname, sizeof(s->hostname));
1702 s->term = packet_get_string(&len);
1705 s->col = packet_get_int();
1706 s->row = packet_get_int();
1708 s->row = packet_get_int();
1709 s->col = packet_get_int();
1711 s->xpixel = packet_get_int();
1712 s->ypixel = packet_get_int();
1714 if (strcmp(s->term, "") == 0) {
1719 /* Allocate a pty and open it. */
1720 debug("Allocating pty.");
1721 if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
1727 error("session_pty_req: session %d alloc failed", s->self);
1730 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1732 /* for SSH1 the tty modes length is not given */
1734 n_bytes = packet_remaining();
1735 tty_parse_modes(s->ttyfd, &n_bytes);
1738 pty_setowner(s->pw, s->tty);
1740 /* Set window size from the packet. */
1741 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1744 session_proctitle(s);
1749 session_subsystem_req(Session *s)
1754 char *cmd, *subsys = packet_get_string(&len);
1758 logit("subsystem request for %.100s", subsys);
1760 for (i = 0; i < options.num_subsystems; i++) {
1761 if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1762 cmd = options.subsystem_command[i];
1763 if (stat(cmd, &st) < 0) {
1764 error("subsystem: cannot stat %s: %s", cmd,
1768 debug("subsystem: exec() %s", cmd);
1769 s->is_subsystem = 1;
1777 logit("subsystem request for %.100s failed, subsystem not found",
1785 session_x11_req(Session *s)
1789 s->single_connection = packet_get_char();
1790 s->auth_proto = packet_get_string(NULL);
1791 s->auth_data = packet_get_string(NULL);
1792 s->screen = packet_get_int();
1795 success = session_setup_x11fwd(s);
1797 xfree(s->auth_proto);
1798 xfree(s->auth_data);
1799 s->auth_proto = NULL;
1800 s->auth_data = NULL;
1806 session_shell_req(Session *s)
1814 session_exec_req(Session *s)
1817 char *command = packet_get_string(&len);
1819 do_exec(s, command);
1825 session_break_req(Session *s)
1828 packet_get_int(); /* ignored */
1831 if (s->ttyfd == -1 ||
1832 tcsendbreak(s->ttyfd, 0) < 0)
1838 session_env_req(Session *s)
1841 u_int name_len, val_len, i;
1843 name = packet_get_string(&name_len);
1844 val = packet_get_string(&val_len);
1847 /* Don't set too many environment variables */
1848 if (s->num_env > 128) {
1849 debug2("Ignoring env request %s: too many env vars", name);
1853 for (i = 0; i < options.num_accept_env; i++) {
1854 if (match_pattern(name, options.accept_env[i])) {
1855 debug2("Setting env %d: %s=%s", s->num_env, name, val);
1856 s->env = xrealloc(s->env, sizeof(*s->env) *
1858 s->env[s->num_env].name = name;
1859 s->env[s->num_env].val = val;
1864 debug2("Ignoring env request %s: disallowed name", name);
1873 session_auth_agent_req(Session *s)
1875 static int called = 0;
1877 if (no_agent_forwarding_flag) {
1878 debug("session_auth_agent_req: no_agent_forwarding_flag");
1885 return auth_input_request_forwarding(s->pw);
1890 session_input_channel_req(Channel *c, const char *rtype)
1895 if ((s = session_by_channel(c->self)) == NULL) {
1896 logit("session_input_channel_req: no session %d req %.100s",
1900 debug("session_input_channel_req: session %d req %s", s->self, rtype);
1903 * a session is in LARVAL state until a shell, a command
1904 * or a subsystem is executed
1906 if (c->type == SSH_CHANNEL_LARVAL) {
1907 if (strcmp(rtype, "shell") == 0) {
1908 success = session_shell_req(s);
1909 } else if (strcmp(rtype, "exec") == 0) {
1910 success = session_exec_req(s);
1911 } else if (strcmp(rtype, "pty-req") == 0) {
1912 success = session_pty_req(s);
1913 } else if (strcmp(rtype, "x11-req") == 0) {
1914 success = session_x11_req(s);
1915 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1916 success = session_auth_agent_req(s);
1917 } else if (strcmp(rtype, "subsystem") == 0) {
1918 success = session_subsystem_req(s);
1919 } else if (strcmp(rtype, "break") == 0) {
1920 success = session_break_req(s);
1921 } else if (strcmp(rtype, "env") == 0) {
1922 success = session_env_req(s);
1925 if (strcmp(rtype, "window-change") == 0) {
1926 success = session_window_change_req(s);
1932 session_set_fds(Session *s, int fdin, int fdout, int fderr)
1935 fatal("session_set_fds: called for proto != 2.0");
1937 * now that have a child and a pipe to the child,
1938 * we can activate our channel and register the fd's
1940 if (s->chanid == -1)
1941 fatal("no channel for session %d", s->self);
1942 channel_set_fds(s->chanid,
1944 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1946 CHAN_SES_WINDOW_DEFAULT);
1950 * Function to perform pty cleanup. Also called if we get aborted abnormally
1951 * (e.g., due to a dropped connection).
1954 session_pty_cleanup2(Session *s)
1957 error("session_pty_cleanup: no session");
1963 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1965 /* Record that the user has logged out. */
1967 record_logout(s->pid, s->tty, s->pw->pw_name);
1969 /* Release the pseudo-tty. */
1971 pty_release(s->tty);
1974 * Close the server side of the socket pairs. We must do this after
1975 * the pty cleanup, so that another process doesn't get this pty
1976 * while we're still cleaning up.
1978 if (close(s->ptymaster) < 0)
1979 error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
1981 /* unlink pty from session */
1986 session_pty_cleanup(Session *s)
1988 PRIVSEP(session_pty_cleanup2(s));
1994 #define SSH_SIG(x) if (sig == SIG ## x) return #x
2009 return "SIG@openssh.com";
2013 session_exit_message(Session *s, int status)
2017 if ((c = channel_lookup(s->chanid)) == NULL)
2018 fatal("session_exit_message: session %d: no channel %d",
2019 s->self, s->chanid);
2020 debug("session_exit_message: session %d channel %d pid %ld",
2021 s->self, s->chanid, (long)s->pid);
2023 if (WIFEXITED(status)) {
2024 channel_request_start(s->chanid, "exit-status", 0);
2025 packet_put_int(WEXITSTATUS(status));
2027 } else if (WIFSIGNALED(status)) {
2028 channel_request_start(s->chanid, "exit-signal", 0);
2029 packet_put_cstring(sig2name(WTERMSIG(status)));
2031 packet_put_char(WCOREDUMP(status));
2032 #else /* WCOREDUMP */
2034 #endif /* WCOREDUMP */
2035 packet_put_cstring("");
2036 packet_put_cstring("");
2039 /* Some weird exit cause. Just exit. */
2040 packet_disconnect("wait returned status %04x.", status);
2043 /* disconnect channel */
2044 debug("session_exit_message: release channel %d", s->chanid);
2045 channel_cancel_cleanup(s->chanid);
2047 * emulate a write failure with 'chan_write_failed', nobody will be
2048 * interested in data we write.
2049 * Note that we must not call 'chan_read_failed', since there could
2050 * be some more data waiting in the pipe.
2052 if (c->ostate != CHAN_OUTPUT_CLOSED)
2053 chan_write_failed(c);
2058 session_close(Session *s)
2062 debug("session_close: session %d pid %ld", s->self, (long)s->pid);
2064 session_pty_cleanup(s);
2069 if (s->auth_display)
2070 xfree(s->auth_display);
2072 xfree(s->auth_data);
2074 xfree(s->auth_proto);
2076 for (i = 0; i < s->num_env; i++) {
2077 xfree(s->env[i].name);
2078 xfree(s->env[i].val);
2082 session_proctitle(s);
2086 session_close_by_pid(pid_t pid, int status)
2088 Session *s = session_by_pid(pid);
2090 debug("session_close_by_pid: no session for pid %ld",
2094 if (s->chanid != -1)
2095 session_exit_message(s, status);
2100 * this is called when a channel dies before
2101 * the session 'child' itself dies
2104 session_close_by_channel(int id, void *arg)
2106 Session *s = session_by_channel(id);
2108 debug("session_close_by_channel: no session for id %d", id);
2111 debug("session_close_by_channel: channel %d child %ld",
2114 debug("session_close_by_channel: channel %d: has child", id);
2116 * delay detach of session, but release pty, since
2117 * the fd's to the child are already closed
2120 session_pty_cleanup(s);
2123 /* detach by removing callback */
2124 channel_cancel_cleanup(s->chanid);
2130 session_destroy_all(void (*closefunc)(Session *))
2133 for (i = 0; i < MAX_SESSIONS; i++) {
2134 Session *s = &sessions[i];
2136 if (closefunc != NULL)
2145 session_tty_list(void)
2147 static char buf[1024];
2152 for (i = 0; i < MAX_SESSIONS; i++) {
2153 Session *s = &sessions[i];
2154 if (s->used && s->ttyfd != -1) {
2156 if (strncmp(s->tty, "/dev/", 5) != 0) {
2157 cp = strrchr(s->tty, '/');
2158 cp = (cp == NULL) ? s->tty : cp + 1;
2163 strlcat(buf, ",", sizeof buf);
2164 strlcat(buf, cp, sizeof buf);
2168 strlcpy(buf, "notty", sizeof buf);
2173 session_proctitle(Session *s)
2176 error("no user for session %d", s->self);
2178 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
2182 session_setup_x11fwd(Session *s)
2185 char display[512], auth_display[512];
2186 char hostname[MAXHOSTNAMELEN];
2188 if (no_x11_forwarding_flag) {
2189 packet_send_debug("X11 forwarding disabled in user configuration file.");
2192 if (!options.x11_forwarding) {
2193 debug("X11 forwarding disabled in server configuration file.");
2196 if (!options.xauth_location ||
2197 (stat(options.xauth_location, &st) == -1)) {
2198 packet_send_debug("No xauth program; cannot forward with spoofing.");
2201 if (options.use_login) {
2202 packet_send_debug("X11 forwarding disabled; "
2203 "not compatible with UseLogin=yes.");
2206 if (s->display != NULL) {
2207 debug("X11 display already set.");
2210 if (x11_create_display_inet(options.x11_display_offset,
2211 options.x11_use_localhost, s->single_connection,
2212 &s->display_number) == -1) {
2213 debug("x11_create_display_inet failed.");
2217 /* Set up a suitable value for the DISPLAY variable. */
2218 if (gethostname(hostname, sizeof(hostname)) < 0)
2219 fatal("gethostname: %.100s", strerror(errno));
2221 * auth_display must be used as the displayname when the
2222 * authorization entry is added with xauth(1). This will be
2223 * different than the DISPLAY string for localhost displays.
2225 if (options.x11_use_localhost) {
2226 snprintf(display, sizeof display, "localhost:%u.%u",
2227 s->display_number, s->screen);
2228 snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
2229 s->display_number, s->screen);
2230 s->display = xstrdup(display);
2231 s->auth_display = xstrdup(auth_display);
2233 #ifdef IPADDR_IN_DISPLAY
2235 struct in_addr my_addr;
2237 he = gethostbyname(hostname);
2239 error("Can't get IP address for X11 DISPLAY.");
2240 packet_send_debug("Can't get IP address for X11 DISPLAY.");
2243 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
2244 snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr),
2245 s->display_number, s->screen);
2247 snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
2248 s->display_number, s->screen);
2250 s->display = xstrdup(display);
2251 s->auth_display = xstrdup(display);
2258 do_authenticated2(Authctxt *authctxt)
2260 server_loop2(authctxt);
2264 do_cleanup(Authctxt *authctxt)
2266 static int called = 0;
2268 debug("do_cleanup");
2270 /* no cleanup if we're in the child for login shell */
2274 /* avoid double cleanup */
2279 if (authctxt == NULL)
2282 if (options.kerberos_ticket_cleanup &&
2284 krb5_cleanup_proc(authctxt);
2288 if (compat20 && options.gss_cleanup_creds)
2289 ssh_gssapi_cleanup_creds();
2293 if (options.use_pam) {
2295 sshpam_thread_cleanup();
2299 /* remove agent socket */
2300 auth_sock_cleanup_proc(authctxt->pw);
2303 * Cleanup ptys/utmp only if privsep is disabled,
2304 * or if running in monitor.
2306 if (!use_privsep || mm_is_monitor())
2307 session_destroy_all(session_pty_cleanup2);