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 1.173 2004/04/27 09:46:37 djm Exp $");
52 #include "auth-options.h"
53 #include "pathnames.h"
57 #include "serverloop.h"
60 #include "monitor_wrap.h"
62 #if defined(KRB5) && defined(USE_AFS)
72 Session *session_new(void);
73 void session_set_fds(Session *, int, int, int);
74 void session_pty_cleanup(Session *);
75 void session_proctitle(Session *);
76 int session_setup_x11fwd(Session *);
77 void do_exec_pty(Session *, const char *);
78 void do_exec_no_pty(Session *, const char *);
79 void do_exec(Session *, const char *);
80 void do_login(Session *, const char *);
81 #ifdef LOGIN_NEEDS_UTMPX
82 static void do_pre_login(Session *s);
84 void do_child(Session *, const char *);
86 int check_quietlogin(Session *, const char *);
88 static void do_authenticated1(Authctxt *);
89 static void do_authenticated2(Authctxt *);
91 static int session_pty_req(Session *);
94 extern ServerOptions options;
95 extern char *__progname;
96 extern int log_stderr;
97 extern int debug_flag;
98 extern u_int utmp_len;
99 extern int startup_pipe;
100 extern void destroy_sensitive_data(void);
101 extern Buffer loginmsg;
103 /* original command from peer. */
104 const char *original_command = NULL;
107 #define MAX_SESSIONS 10
108 Session sessions[MAX_SESSIONS];
110 #ifdef HAVE_LOGIN_CAP
114 static int is_child = 0;
116 /* Name and directory of socket for authentication agent forwarding. */
117 static char *auth_sock_name = NULL;
118 static char *auth_sock_dir = NULL;
120 /* removes the agent forwarding socket */
123 auth_sock_cleanup_proc(struct passwd *pw)
125 if (auth_sock_name != NULL) {
126 temporarily_use_uid(pw);
127 unlink(auth_sock_name);
128 rmdir(auth_sock_dir);
129 auth_sock_name = NULL;
135 auth_input_request_forwarding(struct passwd * pw)
139 struct sockaddr_un sunaddr;
141 if (auth_sock_name != NULL) {
142 error("authentication forwarding requested twice.");
146 /* Temporarily drop privileged uid for mkdir/bind. */
147 temporarily_use_uid(pw);
149 /* Allocate a buffer for the socket name, and format the name. */
150 auth_sock_name = xmalloc(MAXPATHLEN);
151 auth_sock_dir = xmalloc(MAXPATHLEN);
152 strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
154 /* Create private directory for socket */
155 if (mkdtemp(auth_sock_dir) == NULL) {
156 packet_send_debug("Agent forwarding disabled: "
157 "mkdtemp() failed: %.100s", strerror(errno));
159 xfree(auth_sock_name);
160 xfree(auth_sock_dir);
161 auth_sock_name = NULL;
162 auth_sock_dir = NULL;
165 snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld",
166 auth_sock_dir, (long) getpid());
168 /* Create the socket. */
169 sock = socket(AF_UNIX, SOCK_STREAM, 0);
171 packet_disconnect("socket: %.100s", strerror(errno));
173 /* Bind it to the name. */
174 memset(&sunaddr, 0, sizeof(sunaddr));
175 sunaddr.sun_family = AF_UNIX;
176 strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
178 if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
179 packet_disconnect("bind: %.100s", strerror(errno));
181 /* Restore the privileged uid. */
184 /* Start listening on the socket. */
185 if (listen(sock, SSH_LISTEN_BACKLOG) < 0)
186 packet_disconnect("listen: %.100s", strerror(errno));
188 /* Allocate a channel for the authentication agent socket. */
189 nc = channel_new("auth socket",
190 SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
191 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
192 0, "auth socket", 1);
193 strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
198 display_loginmsg(void)
200 if (buffer_len(&loginmsg) > 0) {
201 buffer_append(&loginmsg, "\0", 1);
202 printf("%s\n", (char *)buffer_ptr(&loginmsg));
203 buffer_clear(&loginmsg);
209 do_authenticated(Authctxt *authctxt)
211 setproctitle("%s", authctxt->pw->pw_name);
214 * Cancel the alarm we set to limit the time taken for
218 if (startup_pipe != -1) {
222 /* setup the channel layer */
223 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
224 channel_permit_all_opens();
227 do_authenticated2(authctxt);
229 do_authenticated1(authctxt);
231 do_cleanup(authctxt);
235 * Prepares for an interactive session. This is called after the user has
236 * been successfully authenticated. During this message exchange, pseudo
237 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
238 * are requested, etc.
241 do_authenticated1(Authctxt *authctxt)
245 int success, type, screen_flag;
246 int enable_compression_after_reply = 0;
247 u_int proto_len, data_len, dlen, compression_level = 0;
250 s->authctxt = authctxt;
251 s->pw = authctxt->pw;
254 * We stay in this loop until the client requests to execute a shell
260 /* Get a packet from the client. */
261 type = packet_read();
263 /* Process the packet. */
265 case SSH_CMSG_REQUEST_COMPRESSION:
266 compression_level = packet_get_int();
268 if (compression_level < 1 || compression_level > 9) {
269 packet_send_debug("Received illegal compression level %d.",
273 if (!options.compression) {
274 debug2("compression disabled");
277 /* Enable compression after we have responded with SUCCESS. */
278 enable_compression_after_reply = 1;
282 case SSH_CMSG_REQUEST_PTY:
283 success = session_pty_req(s);
286 case SSH_CMSG_X11_REQUEST_FORWARDING:
287 s->auth_proto = packet_get_string(&proto_len);
288 s->auth_data = packet_get_string(&data_len);
290 screen_flag = packet_get_protocol_flags() &
291 SSH_PROTOFLAG_SCREEN_NUMBER;
292 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
294 if (packet_remaining() == 4) {
296 debug2("Buggy client: "
297 "X11 screen flag missing");
298 s->screen = packet_get_int();
303 success = session_setup_x11fwd(s);
305 xfree(s->auth_proto);
307 s->auth_proto = NULL;
312 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
313 if (no_agent_forwarding_flag || compat13) {
314 debug("Authentication agent forwarding not permitted for this authentication.");
317 debug("Received authentication agent forwarding request.");
318 success = auth_input_request_forwarding(s->pw);
321 case SSH_CMSG_PORT_FORWARD_REQUEST:
322 if (no_port_forwarding_flag) {
323 debug("Port forwarding not permitted for this authentication.");
326 if (!options.allow_tcp_forwarding) {
327 debug("Port forwarding not permitted.");
330 debug("Received TCP/IP port forwarding request.");
331 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
335 case SSH_CMSG_MAX_PACKET_SIZE:
336 if (packet_set_maxsize(packet_get_int()) > 0)
340 case SSH_CMSG_EXEC_SHELL:
341 case SSH_CMSG_EXEC_CMD:
342 if (type == SSH_CMSG_EXEC_CMD) {
343 command = packet_get_string(&dlen);
344 debug("Exec command '%.500s'", command);
356 * Any unknown messages in this phase are ignored,
357 * and a failure message is returned.
359 logit("Unknown packet type received after authentication: %d", type);
361 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
365 /* Enable compression now that we have replied if appropriate. */
366 if (enable_compression_after_reply) {
367 enable_compression_after_reply = 0;
368 packet_start_compression(compression_level);
374 * This is called to fork and execute a command when we have no tty. This
375 * will call do_child from the child, and server_loop from the parent after
376 * setting up file descriptors and such.
379 do_exec_no_pty(Session *s, const char *command)
384 int pin[2], pout[2], perr[2];
385 /* Allocate pipes for communicating with the program. */
386 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
387 packet_disconnect("Could not create pipes: %.100s",
389 #else /* USE_PIPES */
390 int inout[2], err[2];
391 /* Uses socket pairs to communicate with the program. */
392 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
393 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
394 packet_disconnect("Could not create socket pairs: %.100s",
396 #endif /* USE_PIPES */
398 fatal("do_exec_no_pty: no session");
400 session_proctitle(s);
403 if (options.use_pam && !use_privsep)
407 /* Fork the child. */
408 if ((pid = fork()) == 0) {
411 /* Child. Reinitialize the log since the pid has changed. */
412 log_init(__progname, options.log_level, options.log_facility, log_stderr);
415 * Create a new session and process group since the 4.4BSD
416 * setlogin() affects the entire process group.
419 error("setsid failed: %.100s", strerror(errno));
423 * Redirect stdin. We close the parent side of the socket
424 * pair, and make the child side the standard input.
427 if (dup2(pin[0], 0) < 0)
428 perror("dup2 stdin");
431 /* Redirect stdout. */
433 if (dup2(pout[1], 1) < 0)
434 perror("dup2 stdout");
437 /* Redirect stderr. */
439 if (dup2(perr[1], 2) < 0)
440 perror("dup2 stderr");
442 #else /* USE_PIPES */
444 * Redirect stdin, stdout, and stderr. Stdin and stdout will
445 * use the same socket, as some programs (particularly rdist)
446 * seem to depend on it.
450 if (dup2(inout[0], 0) < 0) /* stdin */
451 perror("dup2 stdin");
452 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
453 perror("dup2 stdout");
454 if (dup2(err[0], 2) < 0) /* stderr */
455 perror("dup2 stderr");
456 #endif /* USE_PIPES */
459 cray_init_job(s->pw); /* set up cray jid and tmpdir */
462 /* Do processing for the child (exec command etc). */
463 do_child(s, command);
467 signal(WJSIGNAL, cray_job_termination_handler);
471 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
474 packet_disconnect("fork failed: %.100s", strerror(errno));
476 /* Set interactive/non-interactive mode. */
477 packet_set_interactive(s->display != NULL);
479 /* We are the parent. Close the child sides of the pipes. */
485 session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]);
487 /* Enter the interactive session. */
488 server_loop(pid, pin[1], pout[0], perr[0]);
489 /* server_loop has closed pin[1], pout[0], and perr[0]. */
491 #else /* USE_PIPES */
492 /* We are the parent. Close the child sides of the socket pairs. */
497 * Clear loginmsg, since it's the child's responsibility to display
498 * it to the user, otherwise multiple sessions may accumulate
499 * multiple copies of the login messages.
501 buffer_clear(&loginmsg);
504 * Enter the interactive session. Note: server_loop must be able to
505 * handle the case that fdin and fdout are the same.
508 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
510 server_loop(pid, inout[1], inout[1], err[1]);
511 /* server_loop has closed inout[1] and err[1]. */
513 #endif /* USE_PIPES */
517 * This is called to fork and execute a command when we have a tty. This
518 * will call do_child from the child, and server_loop from the parent after
519 * setting up file descriptors, controlling tty, updating wtmp, utmp,
520 * lastlog, and other such operations.
523 do_exec_pty(Session *s, const char *command)
525 int fdout, ptyfd, ttyfd, ptymaster;
529 fatal("do_exec_pty: no session");
534 if (options.use_pam) {
535 do_pam_set_tty(s->tty);
541 /* Fork the child. */
542 if ((pid = fork()) == 0) {
545 /* Child. Reinitialize the log because the pid has changed. */
546 log_init(__progname, options.log_level, options.log_facility, log_stderr);
547 /* Close the master side of the pseudo tty. */
550 /* Make the pseudo tty our controlling tty. */
551 pty_make_controlling_tty(&ttyfd, s->tty);
553 /* Redirect stdin/stdout/stderr from the pseudo tty. */
554 if (dup2(ttyfd, 0) < 0)
555 error("dup2 stdin: %s", strerror(errno));
556 if (dup2(ttyfd, 1) < 0)
557 error("dup2 stdout: %s", strerror(errno));
558 if (dup2(ttyfd, 2) < 0)
559 error("dup2 stderr: %s", strerror(errno));
561 /* Close the extra descriptor for the pseudo tty. */
564 /* record login, etc. similar to login(1) */
566 if (!(options.use_login && command == NULL)) {
568 cray_init_job(s->pw); /* set up cray jid and tmpdir */
570 do_login(s, command);
572 # ifdef LOGIN_NEEDS_UTMPX
578 /* Do common processing for the child, such as execing the command. */
579 do_child(s, command);
583 signal(WJSIGNAL, cray_job_termination_handler);
587 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
590 packet_disconnect("fork failed: %.100s", strerror(errno));
593 /* Parent. Close the slave side of the pseudo tty. */
597 * Create another descriptor of the pty master side for use as the
598 * standard input. We could use the original descriptor, but this
599 * simplifies code in server_loop. The descriptor is bidirectional.
603 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
605 /* we keep a reference to the pty master */
606 ptymaster = dup(ptyfd);
608 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
609 s->ptymaster = ptymaster;
611 /* Enter interactive session. */
612 packet_set_interactive(1);
614 session_set_fds(s, ptyfd, fdout, -1);
616 server_loop(pid, ptyfd, fdout, -1);
617 /* server_loop _has_ closed ptyfd and fdout. */
621 #ifdef LOGIN_NEEDS_UTMPX
623 do_pre_login(Session *s)
626 struct sockaddr_storage from;
627 pid_t pid = getpid();
630 * Get IP address of client. If the connection is not a socket, let
631 * the address be 0.0.0.0.
633 memset(&from, 0, sizeof(from));
634 fromlen = sizeof(from);
635 if (packet_connection_is_on_socket()) {
636 if (getpeername(packet_get_connection_in(),
637 (struct sockaddr *) & from, &fromlen) < 0) {
638 debug("getpeername: %.100s", strerror(errno));
643 record_utmp_only(pid, s->tty, s->pw->pw_name,
644 get_remote_name_or_ip(utmp_len, options.use_dns),
645 (struct sockaddr *)&from, fromlen);
650 * This is called to fork and execute a command. If another command is
651 * to be forced, execute that instead.
654 do_exec(Session *s, const char *command)
656 if (forced_command) {
657 original_command = command;
658 command = forced_command;
659 debug("Forced command '%.900s'", command);
663 if (options.gss_authentication) {
664 temporarily_use_uid(s->pw);
665 ssh_gssapi_storecreds();
671 do_exec_pty(s, command);
673 do_exec_no_pty(s, command);
675 original_command = NULL;
679 /* administrative, login(1)-like work */
681 do_login(Session *s, const char *command)
685 struct sockaddr_storage from;
686 struct passwd * pw = s->pw;
687 pid_t pid = getpid();
690 * Get IP address of client. If the connection is not a socket, let
691 * the address be 0.0.0.0.
693 memset(&from, 0, sizeof(from));
694 fromlen = sizeof(from);
695 if (packet_connection_is_on_socket()) {
696 if (getpeername(packet_get_connection_in(),
697 (struct sockaddr *) & from, &fromlen) < 0) {
698 debug("getpeername: %.100s", strerror(errno));
703 /* Record that there was a login on that tty from the remote host. */
705 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
706 get_remote_name_or_ip(utmp_len,
708 (struct sockaddr *)&from, fromlen);
712 * If password change is needed, do it now.
713 * This needs to occur before the ~/.hushlogin check.
715 if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) {
718 s->authctxt->force_pwchange = 0;
719 /* XXX - signal [net] parent to enable forwardings */
723 if (check_quietlogin(s, command))
728 #ifndef NO_SSH_LASTLOG
729 if (options.print_lastlog && s->last_login_time != 0) {
730 time_string = ctime(&s->last_login_time);
731 if (strchr(time_string, '\n'))
732 *strchr(time_string, '\n') = 0;
733 if (strcmp(s->hostname, "") == 0)
734 printf("Last login: %s\r\n", time_string);
736 printf("Last login: %s from %s\r\n", time_string,
739 #endif /* NO_SSH_LASTLOG */
745 * Display the message of the day.
753 if (options.print_motd) {
754 #ifdef HAVE_LOGIN_CAP
755 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
758 f = fopen("/etc/motd", "r");
761 while (fgets(buf, sizeof(buf), f))
770 * Check for quiet login, either .hushlogin or command given.
773 check_quietlogin(Session *s, const char *command)
776 struct passwd *pw = s->pw;
779 /* Return 1 if .hushlogin exists or a command given. */
782 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
783 #ifdef HAVE_LOGIN_CAP
784 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
787 if (stat(buf, &st) >= 0)
794 * Sets the value of the given variable in the environment. If the variable
795 * already exists, its value is overriden.
798 child_set_env(char ***envp, u_int *envsizep, const char *name,
806 * If we're passed an uninitialized list, allocate a single null
807 * entry before continuing.
809 if (*envp == NULL && *envsizep == 0) {
810 *envp = xmalloc(sizeof(char *));
816 * Find the slot where the value should be stored. If the variable
817 * already exists, we reuse the slot; otherwise we append a new slot
818 * at the end of the array, expanding if necessary.
821 namelen = strlen(name);
822 for (i = 0; env[i]; i++)
823 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
826 /* Reuse the slot. */
829 /* New variable. Expand if necessary. */
831 if (i >= envsize - 1) {
833 fatal("child_set_env: too many env vars");
835 env = (*envp) = xrealloc(env, envsize * sizeof(char *));
838 /* Need to set the NULL pointer at end of array beyond the new slot. */
842 /* Allocate space and format the variable in the appropriate slot. */
843 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
844 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
848 * Reads environment variables from the given file and adds/overrides them
849 * into the environment. If the file does not exist, this does nothing.
850 * Otherwise, it must consist of empty lines, comments (line starts with '#')
851 * and assignments of the form name=value. No other forms are allowed.
854 read_environment_file(char ***env, u_int *envsize,
855 const char *filename)
862 f = fopen(filename, "r");
866 while (fgets(buf, sizeof(buf), f)) {
868 fatal("Too many lines in environment file %s", filename);
869 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
871 if (!*cp || *cp == '#' || *cp == '\n')
873 if (strchr(cp, '\n'))
874 *strchr(cp, '\n') = '\0';
875 value = strchr(cp, '=');
877 fprintf(stderr, "Bad line %u in %.100s\n", lineno,
882 * Replace the equals sign by nul, and advance value to
887 child_set_env(env, envsize, cp, value);
892 #ifdef HAVE_ETC_DEFAULT_LOGIN
894 * Return named variable from specified environment, or NULL if not present.
897 child_get_env(char **env, const char *name)
903 for (i=0; env[i] != NULL; i++)
904 if (strncmp(name, env[i], len) == 0 && env[i][len] == '=')
905 return(env[i] + len + 1);
910 * Read /etc/default/login.
911 * We pick up the PATH (or SUPATH for root) and UMASK.
914 read_etc_default_login(char ***env, u_int *envsize, uid_t uid)
916 char **tmpenv = NULL, *var;
917 u_int i, tmpenvsize = 0;
921 * We don't want to copy the whole file to the child's environment,
922 * so we use a temporary environment and copy the variables we're
925 read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login");
931 var = child_get_env(tmpenv, "SUPATH");
933 var = child_get_env(tmpenv, "PATH");
935 child_set_env(env, envsize, "PATH", var);
937 if ((var = child_get_env(tmpenv, "UMASK")) != NULL)
938 if (sscanf(var, "%5lo", &mask) == 1)
941 for (i = 0; tmpenv[i] != NULL; i++)
945 #endif /* HAVE_ETC_DEFAULT_LOGIN */
947 void copy_environment(char **source, char ***env, u_int *envsize)
949 char *var_name, *var_val;
955 for(i = 0; source[i] != NULL; i++) {
956 var_name = xstrdup(source[i]);
957 if ((var_val = strstr(var_name, "=")) == NULL) {
963 debug3("Copy environment: %s=%s", var_name, var_val);
964 child_set_env(env, envsize, var_name, var_val);
971 do_setup_env(Session *s, const char *shell)
975 char **env, *laddr, *path = NULL;
976 struct passwd *pw = s->pw;
978 /* Initialize the environment. */
980 env = xmalloc(envsize * sizeof(char *));
985 * The Windows environment contains some setting which are
986 * important for a running system. They must not be dropped.
988 copy_environment(environ, &env, &envsize);
992 /* Allow any GSSAPI methods that we've used to alter
993 * the childs environment as they see fit
995 ssh_gssapi_do_child(&env, &envsize);
998 if (!options.use_login) {
999 /* Set basic environment. */
1000 for (i = 0; i < s->num_env; i++)
1001 child_set_env(&env, &envsize, s->env[i].name,
1004 child_set_env(&env, &envsize, "USER", pw->pw_name);
1005 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
1007 child_set_env(&env, &envsize, "LOGIN", pw->pw_name);
1009 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
1010 #ifdef HAVE_LOGIN_CAP
1011 if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
1012 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1014 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1015 #else /* HAVE_LOGIN_CAP */
1016 # ifndef HAVE_CYGWIN
1018 * There's no standard path on Windows. The path contains
1019 * important components pointing to the system directories,
1020 * needed for loading shared libraries. So the path better
1021 * remains intact here.
1023 # ifdef HAVE_ETC_DEFAULT_LOGIN
1024 read_etc_default_login(&env, &envsize, pw->pw_uid);
1025 path = child_get_env(env, "PATH");
1026 # endif /* HAVE_ETC_DEFAULT_LOGIN */
1027 if (path == NULL || *path == '\0') {
1028 child_set_env(&env, &envsize, "PATH",
1029 s->pw->pw_uid == 0 ?
1030 SUPERUSER_PATH : _PATH_STDPATH);
1032 # endif /* HAVE_CYGWIN */
1033 #endif /* HAVE_LOGIN_CAP */
1035 snprintf(buf, sizeof buf, "%.200s/%.50s",
1036 _PATH_MAILDIR, pw->pw_name);
1037 child_set_env(&env, &envsize, "MAIL", buf);
1039 /* Normal systems set SHELL by default. */
1040 child_set_env(&env, &envsize, "SHELL", shell);
1043 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1045 /* Set custom environment options from RSA authentication. */
1046 if (!options.use_login) {
1047 while (custom_environment) {
1048 struct envstring *ce = custom_environment;
1051 for (i = 0; str[i] != '=' && str[i]; i++)
1053 if (str[i] == '=') {
1055 child_set_env(&env, &envsize, str, str + i + 1);
1057 custom_environment = ce->next;
1063 /* SSH_CLIENT deprecated */
1064 snprintf(buf, sizeof buf, "%.50s %d %d",
1065 get_remote_ipaddr(), get_remote_port(), get_local_port());
1066 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1068 laddr = get_local_ipaddr(packet_get_connection_in());
1069 snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1070 get_remote_ipaddr(), get_remote_port(), laddr, get_local_port());
1072 child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1075 child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1077 child_set_env(&env, &envsize, "TERM", s->term);
1079 child_set_env(&env, &envsize, "DISPLAY", s->display);
1080 if (original_command)
1081 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1085 if (cray_tmpdir[0] != '\0')
1086 child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir);
1087 #endif /* _UNICOS */
1093 if ((cp = getenv("AUTHSTATE")) != NULL)
1094 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1095 if ((cp = getenv("KRB5CCNAME")) != NULL)
1096 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1097 read_environment_file(&env, &envsize, "/etc/environment");
1101 if (s->authctxt->krb5_ccname)
1102 child_set_env(&env, &envsize, "KRB5CCNAME",
1103 s->authctxt->krb5_ccname);
1107 * Pull in any environment variables that may have
1110 if (options.use_pam) {
1113 p = fetch_pam_child_environment();
1114 copy_environment(p, &env, &envsize);
1115 free_pam_environment(p);
1117 p = fetch_pam_environment();
1118 copy_environment(p, &env, &envsize);
1119 free_pam_environment(p);
1121 #endif /* USE_PAM */
1123 if (auth_sock_name != NULL)
1124 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1127 /* read $HOME/.ssh/environment. */
1128 if (options.permit_user_env && !options.use_login) {
1129 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1130 strcmp(pw->pw_dir, "/") ? pw->pw_dir : "");
1131 read_environment_file(&env, &envsize, buf);
1134 /* dump the environment */
1135 fprintf(stderr, "Environment:\n");
1136 for (i = 0; env[i]; i++)
1137 fprintf(stderr, " %.200s\n", env[i]);
1143 * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
1144 * first in this order).
1147 do_rc_files(Session *s, const char *shell)
1155 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
1157 /* ignore _PATH_SSH_USER_RC for subsystems */
1158 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
1159 snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
1160 shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
1162 fprintf(stderr, "Running %s\n", cmd);
1163 f = popen(cmd, "w");
1166 fprintf(f, "%s %s\n", s->auth_proto,
1170 fprintf(stderr, "Could not run %s\n",
1172 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
1174 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
1175 _PATH_SSH_SYSTEM_RC);
1176 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
1179 fprintf(f, "%s %s\n", s->auth_proto,
1183 fprintf(stderr, "Could not run %s\n",
1184 _PATH_SSH_SYSTEM_RC);
1185 } else if (do_xauth && options.xauth_location != NULL) {
1186 /* Add authority data to .Xauthority if appropriate. */
1189 "Running %.500s remove %.100s\n",
1190 options.xauth_location, s->auth_display);
1192 "%.500s add %.100s %.100s %.100s\n",
1193 options.xauth_location, s->auth_display,
1194 s->auth_proto, s->auth_data);
1196 snprintf(cmd, sizeof cmd, "%s -q -",
1197 options.xauth_location);
1198 f = popen(cmd, "w");
1200 fprintf(f, "remove %s\n",
1202 fprintf(f, "add %s %s %s\n",
1203 s->auth_display, s->auth_proto,
1207 fprintf(stderr, "Could not run %s\n",
1214 do_nologin(struct passwd *pw)
1219 #ifdef HAVE_LOGIN_CAP
1220 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1221 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1222 _PATH_NOLOGIN), "r");
1225 f = fopen(_PATH_NOLOGIN, "r");
1228 /* /etc/nologin exists. Print its contents and exit. */
1229 logit("User %.100s not allowed because %s exists",
1230 pw->pw_name, _PATH_NOLOGIN);
1231 while (fgets(buf, sizeof(buf), f))
1239 /* Set login name, uid, gid, and groups. */
1241 do_setusercontext(struct passwd *pw)
1244 if (getuid() == 0 || geteuid() == 0)
1245 #endif /* HAVE_CYGWIN */
1248 #ifdef HAVE_SETPCRED
1249 if (setpcred(pw->pw_name, (char **)NULL) == -1)
1250 fatal("Failed to set process credentials");
1251 #endif /* HAVE_SETPCRED */
1252 #ifdef HAVE_LOGIN_CAP
1257 if (options.use_pam) {
1261 # endif /* USE_PAM */
1262 if (setusercontext(lc, pw, pw->pw_uid,
1263 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1264 perror("unable to set user context");
1268 # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
1269 /* Sets login uid for accounting */
1270 if (getluid() == -1 && setluid(pw->pw_uid) == -1)
1271 error("setluid: %s", strerror(errno));
1272 # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
1274 if (setlogin(pw->pw_name) < 0)
1275 error("setlogin failed: %s", strerror(errno));
1276 if (setgid(pw->pw_gid) < 0) {
1280 /* Initialize the group list. */
1281 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1282 perror("initgroups");
1288 * PAM credentials may take the form of supplementary groups.
1289 * These will have been wiped by the above initgroups() call.
1290 * Reestablish them here.
1292 if (options.use_pam) {
1296 # endif /* USE_PAM */
1297 # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
1298 irix_setusercontext(pw);
1299 # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
1303 /* Permanently switch to the desired uid. */
1304 permanently_set_uid(pw);
1311 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1312 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1316 do_pwchange(Session *s)
1318 fprintf(stderr, "WARNING: Your password has expired.\n");
1319 if (s->ttyfd != -1) {
1321 "You must change your password now and login again!\n");
1322 execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
1326 "Password change required but no TTY available.\n");
1332 launch_login(struct passwd *pw, const char *hostname)
1334 /* Launch login(1). */
1336 execl(LOGIN_PROGRAM, "login", "-h", hostname,
1337 #ifdef xxxLOGIN_NEEDS_TERM
1338 (s->term ? s->term : "unknown"),
1339 #endif /* LOGIN_NEEDS_TERM */
1340 #ifdef LOGIN_NO_ENDOPT
1341 "-p", "-f", pw->pw_name, (char *)NULL);
1343 "-p", "-f", "--", pw->pw_name, (char *)NULL);
1346 /* Login couldn't be executed, die. */
1353 child_close_fds(void)
1357 if (packet_get_connection_in() == packet_get_connection_out())
1358 close(packet_get_connection_in());
1360 close(packet_get_connection_in());
1361 close(packet_get_connection_out());
1364 * Close all descriptors related to channels. They will still remain
1365 * open in the parent.
1367 /* XXX better use close-on-exec? -markus */
1368 channel_close_all();
1371 * Close any extra file descriptors. Note that there may still be
1372 * descriptors left by system functions. They will be closed later.
1377 * Close any extra open file descriptors so that we don\'t have them
1378 * hanging around in clients. Note that we want to do this after
1379 * initgroups, because at least on Solaris 2.3 it leaves file
1382 for (i = 3; i < 64; i++)
1387 * Performs common processing for the child, such as setting up the
1388 * environment, closing extra file descriptors, setting the user and group
1389 * ids, and executing the command or shell.
1392 do_child(Session *s, const char *command)
1394 extern char **environ;
1397 const char *shell, *shell0, *hostname = NULL;
1398 struct passwd *pw = s->pw;
1400 /* remove hostkey from the child's memory */
1401 destroy_sensitive_data();
1403 /* Force a password change */
1404 if (s->authctxt->force_pwchange) {
1405 do_setusercontext(pw);
1411 /* login(1) is only called if we execute the login shell */
1412 if (options.use_login && command != NULL)
1413 options.use_login = 0;
1416 cray_setup(pw->pw_uid, pw->pw_name, command);
1417 #endif /* _UNICOS */
1420 * Login(1) does this as well, and it needs uid 0 for the "-h"
1421 * switch, so we let login(1) to this for us.
1423 if (!options.use_login) {
1425 session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty);
1426 if (!check_quietlogin(s, command))
1428 #else /* HAVE_OSF_SIA */
1430 do_setusercontext(pw);
1431 #endif /* HAVE_OSF_SIA */
1435 * Get the shell from the password data. An empty shell field is
1436 * legal, and means /bin/sh.
1438 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1441 * Make sure $SHELL points to the shell from the password file,
1442 * even if shell is overridden from login.conf
1444 env = do_setup_env(s, shell);
1446 #ifdef HAVE_LOGIN_CAP
1447 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1450 /* we have to stash the hostname before we close our socket. */
1451 if (options.use_login)
1452 hostname = get_remote_name_or_ip(utmp_len,
1455 * Close the connection descriptors; note that this is the child, and
1456 * the server will still have the socket open, and it is important
1457 * that we do not shutdown it. Note that the descriptors cannot be
1458 * closed before building the environment, as we call
1459 * get_remote_ipaddr there.
1464 * Must take new environment into use so that .ssh/rc,
1465 * /etc/ssh/sshrc and xauth are run in the proper environment.
1469 #if defined(KRB5) && defined(USE_AFS)
1471 * At this point, we check to see if AFS is active and if we have
1472 * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1473 * if we can (and need to) extend the ticket into an AFS token. If
1474 * we don't do this, we run into potential problems if the user's
1475 * home directory is in AFS and it's not world-readable.
1478 if (options.kerberos_get_afs_token && k_hasafs() &&
1479 (s->authctxt->krb5_ctx != NULL)) {
1482 debug("Getting AFS token");
1486 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1487 krb5_afslog(s->authctxt->krb5_ctx,
1488 s->authctxt->krb5_fwd_ccache, cell, NULL);
1490 krb5_afslog_home(s->authctxt->krb5_ctx,
1491 s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1495 /* Change current directory to the user\'s home directory. */
1496 if (chdir(pw->pw_dir) < 0) {
1497 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1498 pw->pw_dir, strerror(errno));
1499 #ifdef HAVE_LOGIN_CAP
1500 if (login_getcapbool(lc, "requirehome", 0))
1505 if (!options.use_login)
1506 do_rc_files(s, shell);
1508 /* restore SIGPIPE for child */
1509 signal(SIGPIPE, SIG_DFL);
1511 if (options.use_login) {
1512 launch_login(pw, hostname);
1516 /* Get the last component of the shell name. */
1517 if ((shell0 = strrchr(shell, '/')) != NULL)
1523 * If we have no command, execute the shell. In this case, the shell
1524 * name to be passed in argv[0] is preceded by '-' to indicate that
1525 * this is a login shell.
1530 /* Start the shell. Set initial character to '-'. */
1533 if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1534 >= sizeof(argv0) - 1) {
1540 /* Execute the shell. */
1543 execve(shell, argv, env);
1545 /* Executing the shell failed. */
1550 * Execute the command using the user's shell. This uses the -c
1551 * option to execute the command.
1553 argv[0] = (char *) shell0;
1555 argv[2] = (char *) command;
1557 execve(shell, argv, env);
1566 static int did_init = 0;
1568 debug("session_new: init");
1569 for (i = 0; i < MAX_SESSIONS; i++) {
1570 sessions[i].used = 0;
1574 for (i = 0; i < MAX_SESSIONS; i++) {
1575 Session *s = &sessions[i];
1577 memset(s, 0, sizeof(*s));
1583 debug("session_new: session %d", i);
1594 for (i = 0; i < MAX_SESSIONS; i++) {
1595 Session *s = &sessions[i];
1596 debug("dump: used %d session %d %p channel %d pid %ld",
1606 session_open(Authctxt *authctxt, int chanid)
1608 Session *s = session_new();
1609 debug("session_open: channel %d", chanid);
1611 error("no more sessions");
1614 s->authctxt = authctxt;
1615 s->pw = authctxt->pw;
1616 if (s->pw == NULL || !authctxt->valid)
1617 fatal("no user for session %d", s->self);
1618 debug("session_open: session %d: link with channel %d", s->self, chanid);
1624 session_by_tty(char *tty)
1627 for (i = 0; i < MAX_SESSIONS; i++) {
1628 Session *s = &sessions[i];
1629 if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1630 debug("session_by_tty: session %d tty %s", i, tty);
1634 debug("session_by_tty: unknown tty %.100s", tty);
1640 session_by_channel(int id)
1643 for (i = 0; i < MAX_SESSIONS; i++) {
1644 Session *s = &sessions[i];
1645 if (s->used && s->chanid == id) {
1646 debug("session_by_channel: session %d channel %d", i, id);
1650 debug("session_by_channel: unknown channel %d", id);
1656 session_by_pid(pid_t pid)
1659 debug("session_by_pid: pid %ld", (long)pid);
1660 for (i = 0; i < MAX_SESSIONS; i++) {
1661 Session *s = &sessions[i];
1662 if (s->used && s->pid == pid)
1665 error("session_by_pid: unknown pid %ld", (long)pid);
1671 session_window_change_req(Session *s)
1673 s->col = packet_get_int();
1674 s->row = packet_get_int();
1675 s->xpixel = packet_get_int();
1676 s->ypixel = packet_get_int();
1678 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1683 session_pty_req(Session *s)
1689 debug("Allocating a pty not permitted for this authentication.");
1692 if (s->ttyfd != -1) {
1693 packet_disconnect("Protocol error: you already have a pty.");
1696 /* Get the time and hostname when the user last logged in. */
1697 if (options.print_lastlog) {
1698 s->hostname[0] = '\0';
1699 s->last_login_time = get_last_login_time(s->pw->pw_uid,
1700 s->pw->pw_name, s->hostname, sizeof(s->hostname));
1703 s->term = packet_get_string(&len);
1706 s->col = packet_get_int();
1707 s->row = packet_get_int();
1709 s->row = packet_get_int();
1710 s->col = packet_get_int();
1712 s->xpixel = packet_get_int();
1713 s->ypixel = packet_get_int();
1715 if (strcmp(s->term, "") == 0) {
1720 /* Allocate a pty and open it. */
1721 debug("Allocating pty.");
1722 if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
1728 error("session_pty_req: session %d alloc failed", s->self);
1731 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1733 /* for SSH1 the tty modes length is not given */
1735 n_bytes = packet_remaining();
1736 tty_parse_modes(s->ttyfd, &n_bytes);
1739 pty_setowner(s->pw, s->tty);
1741 /* Set window size from the packet. */
1742 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1745 session_proctitle(s);
1750 session_subsystem_req(Session *s)
1755 char *cmd, *subsys = packet_get_string(&len);
1759 logit("subsystem request for %.100s", subsys);
1761 for (i = 0; i < options.num_subsystems; i++) {
1762 if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1763 cmd = options.subsystem_command[i];
1764 if (stat(cmd, &st) < 0) {
1765 error("subsystem: cannot stat %s: %s", cmd,
1769 debug("subsystem: exec() %s", cmd);
1770 s->is_subsystem = 1;
1778 logit("subsystem request for %.100s failed, subsystem not found",
1786 session_x11_req(Session *s)
1790 s->single_connection = packet_get_char();
1791 s->auth_proto = packet_get_string(NULL);
1792 s->auth_data = packet_get_string(NULL);
1793 s->screen = packet_get_int();
1796 success = session_setup_x11fwd(s);
1798 xfree(s->auth_proto);
1799 xfree(s->auth_data);
1800 s->auth_proto = NULL;
1801 s->auth_data = NULL;
1807 session_shell_req(Session *s)
1815 session_exec_req(Session *s)
1818 char *command = packet_get_string(&len);
1820 do_exec(s, command);
1826 session_break_req(Session *s)
1830 break_length = packet_get_int(); /* ignored */
1833 if (s->ttyfd == -1 ||
1834 tcsendbreak(s->ttyfd, 0) < 0)
1840 session_env_req(Session *s)
1843 u_int name_len, val_len, i;
1845 name = packet_get_string(&name_len);
1846 val = packet_get_string(&val_len);
1849 /* Don't set too many environment variables */
1850 if (s->num_env > 128) {
1851 debug2("Ignoring env request %s: too many env vars", name);
1855 for (i = 0; i < options.num_accept_env; i++) {
1856 if (match_pattern(name, options.accept_env[i])) {
1857 debug2("Setting env %d: %s=%s", s->num_env, name, val);
1858 s->env = xrealloc(s->env, sizeof(*s->env) *
1860 s->env[s->num_env].name = name;
1861 s->env[s->num_env].val = val;
1866 debug2("Ignoring env request %s: disallowed name", name);
1875 session_auth_agent_req(Session *s)
1877 static int called = 0;
1879 if (no_agent_forwarding_flag) {
1880 debug("session_auth_agent_req: no_agent_forwarding_flag");
1887 return auth_input_request_forwarding(s->pw);
1892 session_input_channel_req(Channel *c, const char *rtype)
1897 if ((s = session_by_channel(c->self)) == NULL) {
1898 logit("session_input_channel_req: no session %d req %.100s",
1902 debug("session_input_channel_req: session %d req %s", s->self, rtype);
1905 * a session is in LARVAL state until a shell, a command
1906 * or a subsystem is executed
1908 if (c->type == SSH_CHANNEL_LARVAL) {
1909 if (strcmp(rtype, "shell") == 0) {
1910 success = session_shell_req(s);
1911 } else if (strcmp(rtype, "exec") == 0) {
1912 success = session_exec_req(s);
1913 } else if (strcmp(rtype, "pty-req") == 0) {
1914 success = session_pty_req(s);
1915 } else if (strcmp(rtype, "x11-req") == 0) {
1916 success = session_x11_req(s);
1917 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1918 success = session_auth_agent_req(s);
1919 } else if (strcmp(rtype, "subsystem") == 0) {
1920 success = session_subsystem_req(s);
1921 } else if (strcmp(rtype, "break") == 0) {
1922 success = session_break_req(s);
1923 } else if (strcmp(rtype, "env") == 0) {
1924 success = session_env_req(s);
1927 if (strcmp(rtype, "window-change") == 0) {
1928 success = session_window_change_req(s);
1934 session_set_fds(Session *s, int fdin, int fdout, int fderr)
1937 fatal("session_set_fds: called for proto != 2.0");
1939 * now that have a child and a pipe to the child,
1940 * we can activate our channel and register the fd's
1942 if (s->chanid == -1)
1943 fatal("no channel for session %d", s->self);
1944 channel_set_fds(s->chanid,
1946 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1948 CHAN_SES_WINDOW_DEFAULT);
1952 * Function to perform pty cleanup. Also called if we get aborted abnormally
1953 * (e.g., due to a dropped connection).
1956 session_pty_cleanup2(Session *s)
1959 error("session_pty_cleanup: no session");
1965 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1967 /* Record that the user has logged out. */
1969 record_logout(s->pid, s->tty, s->pw->pw_name);
1971 /* Release the pseudo-tty. */
1973 pty_release(s->tty);
1976 * Close the server side of the socket pairs. We must do this after
1977 * the pty cleanup, so that another process doesn't get this pty
1978 * while we're still cleaning up.
1980 if (close(s->ptymaster) < 0)
1981 error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
1983 /* unlink pty from session */
1988 session_pty_cleanup(Session *s)
1990 PRIVSEP(session_pty_cleanup2(s));
1996 #define SSH_SIG(x) if (sig == SIG ## x) return #x
2011 return "SIG@openssh.com";
2015 session_exit_message(Session *s, int status)
2019 if ((c = channel_lookup(s->chanid)) == NULL)
2020 fatal("session_exit_message: session %d: no channel %d",
2021 s->self, s->chanid);
2022 debug("session_exit_message: session %d channel %d pid %ld",
2023 s->self, s->chanid, (long)s->pid);
2025 if (WIFEXITED(status)) {
2026 channel_request_start(s->chanid, "exit-status", 0);
2027 packet_put_int(WEXITSTATUS(status));
2029 } else if (WIFSIGNALED(status)) {
2030 channel_request_start(s->chanid, "exit-signal", 0);
2031 packet_put_cstring(sig2name(WTERMSIG(status)));
2033 packet_put_char(WCOREDUMP(status));
2034 #else /* WCOREDUMP */
2036 #endif /* WCOREDUMP */
2037 packet_put_cstring("");
2038 packet_put_cstring("");
2041 /* Some weird exit cause. Just exit. */
2042 packet_disconnect("wait returned status %04x.", status);
2045 /* disconnect channel */
2046 debug("session_exit_message: release channel %d", s->chanid);
2047 channel_cancel_cleanup(s->chanid);
2049 * emulate a write failure with 'chan_write_failed', nobody will be
2050 * interested in data we write.
2051 * Note that we must not call 'chan_read_failed', since there could
2052 * be some more data waiting in the pipe.
2054 if (c->ostate != CHAN_OUTPUT_CLOSED)
2055 chan_write_failed(c);
2060 session_close(Session *s)
2064 debug("session_close: session %d pid %ld", s->self, (long)s->pid);
2066 session_pty_cleanup(s);
2071 if (s->auth_display)
2072 xfree(s->auth_display);
2074 xfree(s->auth_data);
2076 xfree(s->auth_proto);
2078 for (i = 0; i < s->num_env; i++) {
2079 xfree(s->env[i].name);
2080 xfree(s->env[i].val);
2084 session_proctitle(s);
2088 session_close_by_pid(pid_t pid, int status)
2090 Session *s = session_by_pid(pid);
2092 debug("session_close_by_pid: no session for pid %ld",
2096 if (s->chanid != -1)
2097 session_exit_message(s, status);
2102 * this is called when a channel dies before
2103 * the session 'child' itself dies
2106 session_close_by_channel(int id, void *arg)
2108 Session *s = session_by_channel(id);
2110 debug("session_close_by_channel: no session for id %d", id);
2113 debug("session_close_by_channel: channel %d child %ld",
2116 debug("session_close_by_channel: channel %d: has child", id);
2118 * delay detach of session, but release pty, since
2119 * the fd's to the child are already closed
2122 session_pty_cleanup(s);
2125 /* detach by removing callback */
2126 channel_cancel_cleanup(s->chanid);
2132 session_destroy_all(void (*closefunc)(Session *))
2135 for (i = 0; i < MAX_SESSIONS; i++) {
2136 Session *s = &sessions[i];
2138 if (closefunc != NULL)
2147 session_tty_list(void)
2149 static char buf[1024];
2154 for (i = 0; i < MAX_SESSIONS; i++) {
2155 Session *s = &sessions[i];
2156 if (s->used && s->ttyfd != -1) {
2158 if (strncmp(s->tty, "/dev/", 5) != 0) {
2159 cp = strrchr(s->tty, '/');
2160 cp = (cp == NULL) ? s->tty : cp + 1;
2165 strlcat(buf, ",", sizeof buf);
2166 strlcat(buf, cp, sizeof buf);
2170 strlcpy(buf, "notty", sizeof buf);
2175 session_proctitle(Session *s)
2178 error("no user for session %d", s->self);
2180 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
2184 session_setup_x11fwd(Session *s)
2187 char display[512], auth_display[512];
2188 char hostname[MAXHOSTNAMELEN];
2190 if (no_x11_forwarding_flag) {
2191 packet_send_debug("X11 forwarding disabled in user configuration file.");
2194 if (!options.x11_forwarding) {
2195 debug("X11 forwarding disabled in server configuration file.");
2198 if (!options.xauth_location ||
2199 (stat(options.xauth_location, &st) == -1)) {
2200 packet_send_debug("No xauth program; cannot forward with spoofing.");
2203 if (options.use_login) {
2204 packet_send_debug("X11 forwarding disabled; "
2205 "not compatible with UseLogin=yes.");
2208 if (s->display != NULL) {
2209 debug("X11 display already set.");
2212 if (x11_create_display_inet(options.x11_display_offset,
2213 options.x11_use_localhost, s->single_connection,
2214 &s->display_number) == -1) {
2215 debug("x11_create_display_inet failed.");
2219 /* Set up a suitable value for the DISPLAY variable. */
2220 if (gethostname(hostname, sizeof(hostname)) < 0)
2221 fatal("gethostname: %.100s", strerror(errno));
2223 * auth_display must be used as the displayname when the
2224 * authorization entry is added with xauth(1). This will be
2225 * different than the DISPLAY string for localhost displays.
2227 if (options.x11_use_localhost) {
2228 snprintf(display, sizeof display, "localhost:%u.%u",
2229 s->display_number, s->screen);
2230 snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
2231 s->display_number, s->screen);
2232 s->display = xstrdup(display);
2233 s->auth_display = xstrdup(auth_display);
2235 #ifdef IPADDR_IN_DISPLAY
2237 struct in_addr my_addr;
2239 he = gethostbyname(hostname);
2241 error("Can't get IP address for X11 DISPLAY.");
2242 packet_send_debug("Can't get IP address for X11 DISPLAY.");
2245 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
2246 snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr),
2247 s->display_number, s->screen);
2249 snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
2250 s->display_number, s->screen);
2252 s->display = xstrdup(display);
2253 s->auth_display = xstrdup(display);
2260 do_authenticated2(Authctxt *authctxt)
2262 server_loop2(authctxt);
2266 do_cleanup(Authctxt *authctxt)
2268 static int called = 0;
2270 debug("do_cleanup");
2272 /* no cleanup if we're in the child for login shell */
2276 /* avoid double cleanup */
2281 if (authctxt == NULL)
2284 if (options.kerberos_ticket_cleanup &&
2286 krb5_cleanup_proc(authctxt);
2290 if (compat20 && options.gss_cleanup_creds)
2291 ssh_gssapi_cleanup_creds();
2295 if (options.use_pam) {
2297 sshpam_thread_cleanup();
2301 /* remove agent socket */
2302 auth_sock_cleanup_proc(authctxt->pw);
2305 * Cleanup ptys/utmp only if privsep is disabled,
2306 * or if running in monitor.
2308 if (!use_privsep || mm_is_monitor())
2309 session_destroy_all(session_pty_cleanup2);