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 1.171 2004/01/13 19:23:15 markus Exp $");
51 #include "auth-options.h"
52 #include "pathnames.h"
56 #include "serverloop.h"
59 #include "monitor_wrap.h"
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));
198 do_authenticated(Authctxt *authctxt)
200 setproctitle("%s", authctxt->pw->pw_name);
203 * Cancel the alarm we set to limit the time taken for
207 if (startup_pipe != -1) {
211 /* setup the channel layer */
212 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
213 channel_permit_all_opens();
216 do_authenticated2(authctxt);
218 do_authenticated1(authctxt);
220 do_cleanup(authctxt);
224 * Prepares for an interactive session. This is called after the user has
225 * been successfully authenticated. During this message exchange, pseudo
226 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
227 * are requested, etc.
230 do_authenticated1(Authctxt *authctxt)
234 int success, type, screen_flag;
235 int enable_compression_after_reply = 0;
236 u_int proto_len, data_len, dlen, compression_level = 0;
239 s->authctxt = authctxt;
240 s->pw = authctxt->pw;
243 * We stay in this loop until the client requests to execute a shell
249 /* Get a packet from the client. */
250 type = packet_read();
252 /* Process the packet. */
254 case SSH_CMSG_REQUEST_COMPRESSION:
255 compression_level = packet_get_int();
257 if (compression_level < 1 || compression_level > 9) {
258 packet_send_debug("Received illegal compression level %d.",
262 if (!options.compression) {
263 debug2("compression disabled");
266 /* Enable compression after we have responded with SUCCESS. */
267 enable_compression_after_reply = 1;
271 case SSH_CMSG_REQUEST_PTY:
272 success = session_pty_req(s);
275 case SSH_CMSG_X11_REQUEST_FORWARDING:
276 s->auth_proto = packet_get_string(&proto_len);
277 s->auth_data = packet_get_string(&data_len);
279 screen_flag = packet_get_protocol_flags() &
280 SSH_PROTOFLAG_SCREEN_NUMBER;
281 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
283 if (packet_remaining() == 4) {
285 debug2("Buggy client: "
286 "X11 screen flag missing");
287 s->screen = packet_get_int();
292 success = session_setup_x11fwd(s);
294 xfree(s->auth_proto);
296 s->auth_proto = NULL;
301 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
302 if (no_agent_forwarding_flag || compat13) {
303 debug("Authentication agent forwarding not permitted for this authentication.");
306 debug("Received authentication agent forwarding request.");
307 success = auth_input_request_forwarding(s->pw);
310 case SSH_CMSG_PORT_FORWARD_REQUEST:
311 if (no_port_forwarding_flag) {
312 debug("Port forwarding not permitted for this authentication.");
315 if (!options.allow_tcp_forwarding) {
316 debug("Port forwarding not permitted.");
319 debug("Received TCP/IP port forwarding request.");
320 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
324 case SSH_CMSG_MAX_PACKET_SIZE:
325 if (packet_set_maxsize(packet_get_int()) > 0)
329 case SSH_CMSG_EXEC_SHELL:
330 case SSH_CMSG_EXEC_CMD:
331 if (type == SSH_CMSG_EXEC_CMD) {
332 command = packet_get_string(&dlen);
333 debug("Exec command '%.500s'", command);
345 * Any unknown messages in this phase are ignored,
346 * and a failure message is returned.
348 logit("Unknown packet type received after authentication: %d", type);
350 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
354 /* Enable compression now that we have replied if appropriate. */
355 if (enable_compression_after_reply) {
356 enable_compression_after_reply = 0;
357 packet_start_compression(compression_level);
363 * This is called to fork and execute a command when we have no tty. This
364 * will call do_child from the child, and server_loop from the parent after
365 * setting up file descriptors and such.
368 do_exec_no_pty(Session *s, const char *command)
373 int pin[2], pout[2], perr[2];
374 /* Allocate pipes for communicating with the program. */
375 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
376 packet_disconnect("Could not create pipes: %.100s",
378 #else /* USE_PIPES */
379 int inout[2], err[2];
380 /* Uses socket pairs to communicate with the program. */
381 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
382 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
383 packet_disconnect("Could not create socket pairs: %.100s",
385 #endif /* USE_PIPES */
387 fatal("do_exec_no_pty: no session");
389 session_proctitle(s);
392 if (options.use_pam) {
394 if (is_pam_password_change_required())
395 packet_disconnect("Password change required but no "
400 /* Fork the child. */
401 if ((pid = fork()) == 0) {
404 /* Child. Reinitialize the log since the pid has changed. */
405 log_init(__progname, options.log_level, options.log_facility, log_stderr);
408 * Create a new session and process group since the 4.4BSD
409 * setlogin() affects the entire process group.
412 error("setsid failed: %.100s", strerror(errno));
416 * Redirect stdin. We close the parent side of the socket
417 * pair, and make the child side the standard input.
420 if (dup2(pin[0], 0) < 0)
421 perror("dup2 stdin");
424 /* Redirect stdout. */
426 if (dup2(pout[1], 1) < 0)
427 perror("dup2 stdout");
430 /* Redirect stderr. */
432 if (dup2(perr[1], 2) < 0)
433 perror("dup2 stderr");
435 #else /* USE_PIPES */
437 * Redirect stdin, stdout, and stderr. Stdin and stdout will
438 * use the same socket, as some programs (particularly rdist)
439 * seem to depend on it.
443 if (dup2(inout[0], 0) < 0) /* stdin */
444 perror("dup2 stdin");
445 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
446 perror("dup2 stdout");
447 if (dup2(err[0], 2) < 0) /* stderr */
448 perror("dup2 stderr");
449 #endif /* USE_PIPES */
452 cray_init_job(s->pw); /* set up cray jid and tmpdir */
455 /* Do processing for the child (exec command etc). */
456 do_child(s, command);
460 signal(WJSIGNAL, cray_job_termination_handler);
464 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
467 packet_disconnect("fork failed: %.100s", strerror(errno));
469 /* Set interactive/non-interactive mode. */
470 packet_set_interactive(s->display != NULL);
472 /* We are the parent. Close the child sides of the pipes. */
478 session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]);
480 /* Enter the interactive session. */
481 server_loop(pid, pin[1], pout[0], perr[0]);
482 /* server_loop has closed pin[1], pout[0], and perr[0]. */
484 #else /* USE_PIPES */
485 /* We are the parent. Close the child sides of the socket pairs. */
490 * Enter the interactive session. Note: server_loop must be able to
491 * handle the case that fdin and fdout are the same.
494 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
496 server_loop(pid, inout[1], inout[1], err[1]);
497 /* server_loop has closed inout[1] and err[1]. */
499 #endif /* USE_PIPES */
503 * This is called to fork and execute a command when we have a tty. This
504 * will call do_child from the child, and server_loop from the parent after
505 * setting up file descriptors, controlling tty, updating wtmp, utmp,
506 * lastlog, and other such operations.
509 do_exec_pty(Session *s, const char *command)
511 int fdout, ptyfd, ttyfd, ptymaster;
515 fatal("do_exec_pty: no session");
520 if (options.use_pam) {
521 do_pam_set_tty(s->tty);
526 /* Fork the child. */
527 if ((pid = fork()) == 0) {
530 /* Child. Reinitialize the log because the pid has changed. */
531 log_init(__progname, options.log_level, options.log_facility, log_stderr);
532 /* Close the master side of the pseudo tty. */
535 /* Make the pseudo tty our controlling tty. */
536 pty_make_controlling_tty(&ttyfd, s->tty);
538 /* Redirect stdin/stdout/stderr from the pseudo tty. */
539 if (dup2(ttyfd, 0) < 0)
540 error("dup2 stdin: %s", strerror(errno));
541 if (dup2(ttyfd, 1) < 0)
542 error("dup2 stdout: %s", strerror(errno));
543 if (dup2(ttyfd, 2) < 0)
544 error("dup2 stderr: %s", strerror(errno));
546 /* Close the extra descriptor for the pseudo tty. */
549 /* record login, etc. similar to login(1) */
551 if (!(options.use_login && command == NULL)) {
553 cray_init_job(s->pw); /* set up cray jid and tmpdir */
555 do_login(s, command);
557 # ifdef LOGIN_NEEDS_UTMPX
563 /* Do common processing for the child, such as execing the command. */
564 do_child(s, command);
568 signal(WJSIGNAL, cray_job_termination_handler);
572 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
575 packet_disconnect("fork failed: %.100s", strerror(errno));
578 /* Parent. Close the slave side of the pseudo tty. */
582 * Create another descriptor of the pty master side for use as the
583 * standard input. We could use the original descriptor, but this
584 * simplifies code in server_loop. The descriptor is bidirectional.
588 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
590 /* we keep a reference to the pty master */
591 ptymaster = dup(ptyfd);
593 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
594 s->ptymaster = ptymaster;
596 /* Enter interactive session. */
597 packet_set_interactive(1);
599 session_set_fds(s, ptyfd, fdout, -1);
601 server_loop(pid, ptyfd, fdout, -1);
602 /* server_loop _has_ closed ptyfd and fdout. */
606 #ifdef LOGIN_NEEDS_UTMPX
608 do_pre_login(Session *s)
611 struct sockaddr_storage from;
612 pid_t pid = getpid();
615 * Get IP address of client. If the connection is not a socket, let
616 * the address be 0.0.0.0.
618 memset(&from, 0, sizeof(from));
619 fromlen = sizeof(from);
620 if (packet_connection_is_on_socket()) {
621 if (getpeername(packet_get_connection_in(),
622 (struct sockaddr *) & from, &fromlen) < 0) {
623 debug("getpeername: %.100s", strerror(errno));
628 record_utmp_only(pid, s->tty, s->pw->pw_name,
629 get_remote_name_or_ip(utmp_len, options.use_dns),
630 (struct sockaddr *)&from, fromlen);
635 * This is called to fork and execute a command. If another command is
636 * to be forced, execute that instead.
639 do_exec(Session *s, const char *command)
641 if (forced_command) {
642 original_command = command;
643 command = forced_command;
644 debug("Forced command '%.900s'", command);
648 if (options.gss_authentication) {
649 temporarily_use_uid(s->pw);
650 ssh_gssapi_storecreds();
656 do_exec_pty(s, command);
658 do_exec_no_pty(s, command);
660 original_command = NULL;
664 /* administrative, login(1)-like work */
666 do_login(Session *s, const char *command)
670 struct sockaddr_storage from;
671 struct passwd * pw = s->pw;
672 pid_t pid = getpid();
675 * Get IP address of client. If the connection is not a socket, let
676 * the address be 0.0.0.0.
678 memset(&from, 0, sizeof(from));
679 fromlen = sizeof(from);
680 if (packet_connection_is_on_socket()) {
681 if (getpeername(packet_get_connection_in(),
682 (struct sockaddr *) & from, &fromlen) < 0) {
683 debug("getpeername: %.100s", strerror(errno));
688 /* Record that there was a login on that tty from the remote host. */
690 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
691 get_remote_name_or_ip(utmp_len,
693 (struct sockaddr *)&from, fromlen);
697 * If password change is needed, do it now.
698 * This needs to occur before the ~/.hushlogin check.
700 if (options.use_pam && is_pam_password_change_required()) {
701 print_pam_messages();
703 /* XXX - signal [net] parent to enable forwardings */
707 if (check_quietlogin(s, command))
711 if (options.use_pam && !is_pam_password_change_required())
712 print_pam_messages();
715 /* display post-login message */
716 if (buffer_len(&loginmsg) > 0) {
717 buffer_append(&loginmsg, "\0", 1);
718 printf("%s\n", (char *)buffer_ptr(&loginmsg));
720 buffer_free(&loginmsg);
722 #ifndef NO_SSH_LASTLOG
723 if (options.print_lastlog && s->last_login_time != 0) {
724 time_string = ctime(&s->last_login_time);
725 if (strchr(time_string, '\n'))
726 *strchr(time_string, '\n') = 0;
727 if (strcmp(s->hostname, "") == 0)
728 printf("Last login: %s\r\n", time_string);
730 printf("Last login: %s from %s\r\n", time_string,
733 #endif /* NO_SSH_LASTLOG */
739 * Display the message of the day.
747 if (options.print_motd) {
748 #ifdef HAVE_LOGIN_CAP
749 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
752 f = fopen("/etc/motd", "r");
755 while (fgets(buf, sizeof(buf), f))
764 * Check for quiet login, either .hushlogin or command given.
767 check_quietlogin(Session *s, const char *command)
770 struct passwd *pw = s->pw;
773 /* Return 1 if .hushlogin exists or a command given. */
776 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
777 #ifdef HAVE_LOGIN_CAP
778 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
781 if (stat(buf, &st) >= 0)
788 * Sets the value of the given variable in the environment. If the variable
789 * already exists, its value is overriden.
792 child_set_env(char ***envp, u_int *envsizep, const char *name,
800 * If we're passed an uninitialized list, allocate a single null
801 * entry before continuing.
803 if (*envp == NULL && *envsizep == 0) {
804 *envp = xmalloc(sizeof(char *));
810 * Find the slot where the value should be stored. If the variable
811 * already exists, we reuse the slot; otherwise we append a new slot
812 * at the end of the array, expanding if necessary.
815 namelen = strlen(name);
816 for (i = 0; env[i]; i++)
817 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
820 /* Reuse the slot. */
823 /* New variable. Expand if necessary. */
825 if (i >= envsize - 1) {
827 fatal("child_set_env: too many env vars");
829 env = (*envp) = xrealloc(env, envsize * sizeof(char *));
832 /* Need to set the NULL pointer at end of array beyond the new slot. */
836 /* Allocate space and format the variable in the appropriate slot. */
837 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
838 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
842 * Reads environment variables from the given file and adds/overrides them
843 * into the environment. If the file does not exist, this does nothing.
844 * Otherwise, it must consist of empty lines, comments (line starts with '#')
845 * and assignments of the form name=value. No other forms are allowed.
848 read_environment_file(char ***env, u_int *envsize,
849 const char *filename)
856 f = fopen(filename, "r");
860 while (fgets(buf, sizeof(buf), f)) {
862 fatal("Too many lines in environment file %s", filename);
863 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
865 if (!*cp || *cp == '#' || *cp == '\n')
867 if (strchr(cp, '\n'))
868 *strchr(cp, '\n') = '\0';
869 value = strchr(cp, '=');
871 fprintf(stderr, "Bad line %u in %.100s\n", lineno,
876 * Replace the equals sign by nul, and advance value to
881 child_set_env(env, envsize, cp, value);
886 #ifdef HAVE_ETC_DEFAULT_LOGIN
888 * Return named variable from specified environment, or NULL if not present.
891 child_get_env(char **env, const char *name)
897 for (i=0; env[i] != NULL; i++)
898 if (strncmp(name, env[i], len) == 0 && env[i][len] == '=')
899 return(env[i] + len + 1);
904 * Read /etc/default/login.
905 * We pick up the PATH (or SUPATH for root) and UMASK.
908 read_etc_default_login(char ***env, u_int *envsize, uid_t uid)
910 char **tmpenv = NULL, *var;
911 u_int i, tmpenvsize = 0;
915 * We don't want to copy the whole file to the child's environment,
916 * so we use a temporary environment and copy the variables we're
919 read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login");
925 var = child_get_env(tmpenv, "SUPATH");
927 var = child_get_env(tmpenv, "PATH");
929 child_set_env(env, envsize, "PATH", var);
931 if ((var = child_get_env(tmpenv, "UMASK")) != NULL)
932 if (sscanf(var, "%5lo", &mask) == 1)
935 for (i = 0; tmpenv[i] != NULL; i++)
939 #endif /* HAVE_ETC_DEFAULT_LOGIN */
941 void copy_environment(char **source, char ***env, u_int *envsize)
943 char *var_name, *var_val;
949 for(i = 0; source[i] != NULL; i++) {
950 var_name = xstrdup(source[i]);
951 if ((var_val = strstr(var_name, "=")) == NULL) {
957 debug3("Copy environment: %s=%s", var_name, var_val);
958 child_set_env(env, envsize, var_name, var_val);
965 do_setup_env(Session *s, const char *shell)
969 char **env, *laddr, *path = NULL;
970 struct passwd *pw = s->pw;
972 /* Initialize the environment. */
974 env = xmalloc(envsize * sizeof(char *));
979 * The Windows environment contains some setting which are
980 * important for a running system. They must not be dropped.
982 copy_environment(environ, &env, &envsize);
986 /* Allow any GSSAPI methods that we've used to alter
987 * the childs environment as they see fit
989 ssh_gssapi_do_child(&env, &envsize);
992 if (!options.use_login) {
993 /* Set basic environment. */
994 child_set_env(&env, &envsize, "USER", pw->pw_name);
995 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
997 child_set_env(&env, &envsize, "LOGIN", pw->pw_name);
999 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
1000 #ifdef HAVE_LOGIN_CAP
1001 if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
1002 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1004 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1005 #else /* HAVE_LOGIN_CAP */
1006 # ifndef HAVE_CYGWIN
1008 * There's no standard path on Windows. The path contains
1009 * important components pointing to the system directories,
1010 * needed for loading shared libraries. So the path better
1011 * remains intact here.
1013 # ifdef HAVE_ETC_DEFAULT_LOGIN
1014 read_etc_default_login(&env, &envsize, pw->pw_uid);
1015 path = child_get_env(env, "PATH");
1016 # endif /* HAVE_ETC_DEFAULT_LOGIN */
1017 if (path == NULL || *path == '\0') {
1018 child_set_env(&env, &envsize, "PATH",
1019 s->pw->pw_uid == 0 ?
1020 SUPERUSER_PATH : _PATH_STDPATH);
1022 # endif /* HAVE_CYGWIN */
1023 #endif /* HAVE_LOGIN_CAP */
1025 snprintf(buf, sizeof buf, "%.200s/%.50s",
1026 _PATH_MAILDIR, pw->pw_name);
1027 child_set_env(&env, &envsize, "MAIL", buf);
1029 /* Normal systems set SHELL by default. */
1030 child_set_env(&env, &envsize, "SHELL", shell);
1033 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1035 /* Set custom environment options from RSA authentication. */
1036 if (!options.use_login) {
1037 while (custom_environment) {
1038 struct envstring *ce = custom_environment;
1041 for (i = 0; str[i] != '=' && str[i]; i++)
1043 if (str[i] == '=') {
1045 child_set_env(&env, &envsize, str, str + i + 1);
1047 custom_environment = ce->next;
1053 /* SSH_CLIENT deprecated */
1054 snprintf(buf, sizeof buf, "%.50s %d %d",
1055 get_remote_ipaddr(), get_remote_port(), get_local_port());
1056 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1058 laddr = get_local_ipaddr(packet_get_connection_in());
1059 snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1060 get_remote_ipaddr(), get_remote_port(), laddr, get_local_port());
1062 child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1065 child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1067 child_set_env(&env, &envsize, "TERM", s->term);
1069 child_set_env(&env, &envsize, "DISPLAY", s->display);
1070 if (original_command)
1071 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1075 if (cray_tmpdir[0] != '\0')
1076 child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir);
1077 #endif /* _UNICOS */
1083 if ((cp = getenv("AUTHSTATE")) != NULL)
1084 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1085 if ((cp = getenv("KRB5CCNAME")) != NULL)
1086 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1087 read_environment_file(&env, &envsize, "/etc/environment");
1091 if (s->authctxt->krb5_ticket_file)
1092 child_set_env(&env, &envsize, "KRB5CCNAME",
1093 s->authctxt->krb5_ticket_file);
1097 * Pull in any environment variables that may have
1100 if (options.use_pam) {
1103 p = fetch_pam_child_environment();
1104 copy_environment(p, &env, &envsize);
1105 free_pam_environment(p);
1107 p = fetch_pam_environment();
1108 copy_environment(p, &env, &envsize);
1109 free_pam_environment(p);
1111 #endif /* USE_PAM */
1113 if (auth_sock_name != NULL)
1114 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1117 /* read $HOME/.ssh/environment. */
1118 if (options.permit_user_env && !options.use_login) {
1119 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1120 strcmp(pw->pw_dir, "/") ? pw->pw_dir : "");
1121 read_environment_file(&env, &envsize, buf);
1124 /* dump the environment */
1125 fprintf(stderr, "Environment:\n");
1126 for (i = 0; env[i]; i++)
1127 fprintf(stderr, " %.200s\n", env[i]);
1133 * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
1134 * first in this order).
1137 do_rc_files(Session *s, const char *shell)
1145 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
1147 /* ignore _PATH_SSH_USER_RC for subsystems */
1148 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
1149 snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
1150 shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
1152 fprintf(stderr, "Running %s\n", cmd);
1153 f = popen(cmd, "w");
1156 fprintf(f, "%s %s\n", s->auth_proto,
1160 fprintf(stderr, "Could not run %s\n",
1162 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
1164 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
1165 _PATH_SSH_SYSTEM_RC);
1166 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
1169 fprintf(f, "%s %s\n", s->auth_proto,
1173 fprintf(stderr, "Could not run %s\n",
1174 _PATH_SSH_SYSTEM_RC);
1175 } else if (do_xauth && options.xauth_location != NULL) {
1176 /* Add authority data to .Xauthority if appropriate. */
1179 "Running %.500s remove %.100s\n",
1180 options.xauth_location, s->auth_display);
1182 "%.500s add %.100s %.100s %.100s\n",
1183 options.xauth_location, s->auth_display,
1184 s->auth_proto, s->auth_data);
1186 snprintf(cmd, sizeof cmd, "%s -q -",
1187 options.xauth_location);
1188 f = popen(cmd, "w");
1190 fprintf(f, "remove %s\n",
1192 fprintf(f, "add %s %s %s\n",
1193 s->auth_display, s->auth_proto,
1197 fprintf(stderr, "Could not run %s\n",
1204 do_nologin(struct passwd *pw)
1209 #ifdef HAVE_LOGIN_CAP
1210 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1211 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1212 _PATH_NOLOGIN), "r");
1215 f = fopen(_PATH_NOLOGIN, "r");
1218 /* /etc/nologin exists. Print its contents and exit. */
1219 logit("User %.100s not allowed because %s exists",
1220 pw->pw_name, _PATH_NOLOGIN);
1221 while (fgets(buf, sizeof(buf), f))
1229 /* Set login name, uid, gid, and groups. */
1231 do_setusercontext(struct passwd *pw)
1234 if (getuid() == 0 || geteuid() == 0)
1235 #endif /* HAVE_CYGWIN */
1238 #ifdef HAVE_SETPCRED
1239 if (setpcred(pw->pw_name, (char **)NULL) == -1)
1240 fatal("Failed to set process credentials");
1241 #endif /* HAVE_SETPCRED */
1242 #ifdef HAVE_LOGIN_CAP
1246 if (setusercontext(lc, pw, pw->pw_uid,
1247 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1248 perror("unable to set user context");
1252 # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
1253 /* Sets login uid for accounting */
1254 if (getluid() == -1 && setluid(pw->pw_uid) == -1)
1255 error("setluid: %s", strerror(errno));
1256 # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
1258 if (setlogin(pw->pw_name) < 0)
1259 error("setlogin failed: %s", strerror(errno));
1260 if (setgid(pw->pw_gid) < 0) {
1264 /* Initialize the group list. */
1265 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1266 perror("initgroups");
1272 * PAM credentials may take the form of supplementary groups.
1273 * These will have been wiped by the above initgroups() call.
1274 * Reestablish them here.
1276 if (options.use_pam) {
1280 # endif /* USE_PAM */
1281 # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
1282 irix_setusercontext(pw);
1283 # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
1287 /* Permanently switch to the desired uid. */
1288 permanently_set_uid(pw);
1295 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1296 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1300 launch_login(struct passwd *pw, const char *hostname)
1302 /* Launch login(1). */
1304 execl(LOGIN_PROGRAM, "login", "-h", hostname,
1305 #ifdef xxxLOGIN_NEEDS_TERM
1306 (s->term ? s->term : "unknown"),
1307 #endif /* LOGIN_NEEDS_TERM */
1308 #ifdef LOGIN_NO_ENDOPT
1309 "-p", "-f", pw->pw_name, (char *)NULL);
1311 "-p", "-f", "--", pw->pw_name, (char *)NULL);
1314 /* Login couldn't be executed, die. */
1321 * Performs common processing for the child, such as setting up the
1322 * environment, closing extra file descriptors, setting the user and group
1323 * ids, and executing the command or shell.
1326 do_child(Session *s, const char *command)
1328 extern char **environ;
1331 const char *shell, *shell0, *hostname = NULL;
1332 struct passwd *pw = s->pw;
1335 /* remove hostkey from the child's memory */
1336 destroy_sensitive_data();
1338 /* login(1) is only called if we execute the login shell */
1339 if (options.use_login && command != NULL)
1340 options.use_login = 0;
1343 cray_setup(pw->pw_uid, pw->pw_name, command);
1344 #endif /* _UNICOS */
1347 * Login(1) does this as well, and it needs uid 0 for the "-h"
1348 * switch, so we let login(1) to this for us.
1350 if (!options.use_login) {
1352 session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty);
1353 if (!check_quietlogin(s, command))
1355 #else /* HAVE_OSF_SIA */
1357 do_setusercontext(pw);
1358 #endif /* HAVE_OSF_SIA */
1362 * Get the shell from the password data. An empty shell field is
1363 * legal, and means /bin/sh.
1365 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1368 * Make sure $SHELL points to the shell from the password file,
1369 * even if shell is overridden from login.conf
1371 env = do_setup_env(s, shell);
1373 #ifdef HAVE_LOGIN_CAP
1374 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1377 /* we have to stash the hostname before we close our socket. */
1378 if (options.use_login)
1379 hostname = get_remote_name_or_ip(utmp_len,
1382 * Close the connection descriptors; note that this is the child, and
1383 * the server will still have the socket open, and it is important
1384 * that we do not shutdown it. Note that the descriptors cannot be
1385 * closed before building the environment, as we call
1386 * get_remote_ipaddr there.
1388 if (packet_get_connection_in() == packet_get_connection_out())
1389 close(packet_get_connection_in());
1391 close(packet_get_connection_in());
1392 close(packet_get_connection_out());
1395 * Close all descriptors related to channels. They will still remain
1396 * open in the parent.
1398 /* XXX better use close-on-exec? -markus */
1399 channel_close_all();
1402 * Close any extra file descriptors. Note that there may still be
1403 * descriptors left by system functions. They will be closed later.
1408 * Close any extra open file descriptors so that we don\'t have them
1409 * hanging around in clients. Note that we want to do this after
1410 * initgroups, because at least on Solaris 2.3 it leaves file
1413 for (i = 3; i < 64; i++)
1417 * Must take new environment into use so that .ssh/rc,
1418 * /etc/ssh/sshrc and xauth are run in the proper environment.
1422 #if defined(KRB5) && defined(AFS)
1424 * At this point, we check to see if AFS is active and if we have
1425 * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1426 * if we can (and need to) extend the ticket into an AFS token. If
1427 * we don't do this, we run into potential problems if the user's
1428 * home directory is in AFS and it's not world-readable.
1431 if (options.kerberos_get_afs_token && k_hasafs() &&
1432 (s->authctxt->krb5_ctx != NULL)) {
1435 debug("Getting AFS token");
1439 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1440 krb5_afslog(s->authctxt->krb5_ctx,
1441 s->authctxt->krb5_fwd_ccache, cell, NULL);
1443 krb5_afslog_home(s->authctxt->krb5_ctx,
1444 s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1448 /* Change current directory to the user\'s home directory. */
1449 if (chdir(pw->pw_dir) < 0) {
1450 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1451 pw->pw_dir, strerror(errno));
1452 #ifdef HAVE_LOGIN_CAP
1453 if (login_getcapbool(lc, "requirehome", 0))
1458 if (!options.use_login)
1459 do_rc_files(s, shell);
1461 /* restore SIGPIPE for child */
1462 signal(SIGPIPE, SIG_DFL);
1464 if (options.use_login) {
1465 launch_login(pw, hostname);
1469 /* Get the last component of the shell name. */
1470 if ((shell0 = strrchr(shell, '/')) != NULL)
1476 * If we have no command, execute the shell. In this case, the shell
1477 * name to be passed in argv[0] is preceded by '-' to indicate that
1478 * this is a login shell.
1483 /* Start the shell. Set initial character to '-'. */
1486 if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1487 >= sizeof(argv0) - 1) {
1493 /* Execute the shell. */
1496 execve(shell, argv, env);
1498 /* Executing the shell failed. */
1503 * Execute the command using the user's shell. This uses the -c
1504 * option to execute the command.
1506 argv[0] = (char *) shell0;
1508 argv[2] = (char *) command;
1510 execve(shell, argv, env);
1519 static int did_init = 0;
1521 debug("session_new: init");
1522 for (i = 0; i < MAX_SESSIONS; i++) {
1523 sessions[i].used = 0;
1527 for (i = 0; i < MAX_SESSIONS; i++) {
1528 Session *s = &sessions[i];
1530 memset(s, 0, sizeof(*s));
1536 debug("session_new: session %d", i);
1547 for (i = 0; i < MAX_SESSIONS; i++) {
1548 Session *s = &sessions[i];
1549 debug("dump: used %d session %d %p channel %d pid %ld",
1559 session_open(Authctxt *authctxt, int chanid)
1561 Session *s = session_new();
1562 debug("session_open: channel %d", chanid);
1564 error("no more sessions");
1567 s->authctxt = authctxt;
1568 s->pw = authctxt->pw;
1569 if (s->pw == NULL || !authctxt->valid)
1570 fatal("no user for session %d", s->self);
1571 debug("session_open: session %d: link with channel %d", s->self, chanid);
1577 session_by_tty(char *tty)
1580 for (i = 0; i < MAX_SESSIONS; i++) {
1581 Session *s = &sessions[i];
1582 if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1583 debug("session_by_tty: session %d tty %s", i, tty);
1587 debug("session_by_tty: unknown tty %.100s", tty);
1593 session_by_channel(int id)
1596 for (i = 0; i < MAX_SESSIONS; i++) {
1597 Session *s = &sessions[i];
1598 if (s->used && s->chanid == id) {
1599 debug("session_by_channel: session %d channel %d", i, id);
1603 debug("session_by_channel: unknown channel %d", id);
1609 session_by_pid(pid_t pid)
1612 debug("session_by_pid: pid %ld", (long)pid);
1613 for (i = 0; i < MAX_SESSIONS; i++) {
1614 Session *s = &sessions[i];
1615 if (s->used && s->pid == pid)
1618 error("session_by_pid: unknown pid %ld", (long)pid);
1624 session_window_change_req(Session *s)
1626 s->col = packet_get_int();
1627 s->row = packet_get_int();
1628 s->xpixel = packet_get_int();
1629 s->ypixel = packet_get_int();
1631 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1636 session_pty_req(Session *s)
1642 debug("Allocating a pty not permitted for this authentication.");
1645 if (s->ttyfd != -1) {
1646 packet_disconnect("Protocol error: you already have a pty.");
1649 /* Get the time and hostname when the user last logged in. */
1650 if (options.print_lastlog) {
1651 s->hostname[0] = '\0';
1652 s->last_login_time = get_last_login_time(s->pw->pw_uid,
1653 s->pw->pw_name, s->hostname, sizeof(s->hostname));
1656 s->term = packet_get_string(&len);
1659 s->col = packet_get_int();
1660 s->row = packet_get_int();
1662 s->row = packet_get_int();
1663 s->col = packet_get_int();
1665 s->xpixel = packet_get_int();
1666 s->ypixel = packet_get_int();
1668 if (strcmp(s->term, "") == 0) {
1673 /* Allocate a pty and open it. */
1674 debug("Allocating pty.");
1675 if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
1681 error("session_pty_req: session %d alloc failed", s->self);
1684 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1686 /* for SSH1 the tty modes length is not given */
1688 n_bytes = packet_remaining();
1689 tty_parse_modes(s->ttyfd, &n_bytes);
1692 pty_setowner(s->pw, s->tty);
1694 /* Set window size from the packet. */
1695 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1698 session_proctitle(s);
1703 session_subsystem_req(Session *s)
1708 char *cmd, *subsys = packet_get_string(&len);
1712 logit("subsystem request for %.100s", subsys);
1714 for (i = 0; i < options.num_subsystems; i++) {
1715 if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1716 cmd = options.subsystem_command[i];
1717 if (stat(cmd, &st) < 0) {
1718 error("subsystem: cannot stat %s: %s", cmd,
1722 debug("subsystem: exec() %s", cmd);
1723 s->is_subsystem = 1;
1731 logit("subsystem request for %.100s failed, subsystem not found",
1739 session_x11_req(Session *s)
1743 s->single_connection = packet_get_char();
1744 s->auth_proto = packet_get_string(NULL);
1745 s->auth_data = packet_get_string(NULL);
1746 s->screen = packet_get_int();
1749 success = session_setup_x11fwd(s);
1751 xfree(s->auth_proto);
1752 xfree(s->auth_data);
1753 s->auth_proto = NULL;
1754 s->auth_data = NULL;
1760 session_shell_req(Session *s)
1768 session_exec_req(Session *s)
1771 char *command = packet_get_string(&len);
1773 do_exec(s, command);
1779 session_break_req(Session *s)
1783 break_length = packet_get_int(); /* ignored */
1786 if (s->ttyfd == -1 ||
1787 tcsendbreak(s->ttyfd, 0) < 0)
1793 session_auth_agent_req(Session *s)
1795 static int called = 0;
1797 if (no_agent_forwarding_flag) {
1798 debug("session_auth_agent_req: no_agent_forwarding_flag");
1805 return auth_input_request_forwarding(s->pw);
1810 session_input_channel_req(Channel *c, const char *rtype)
1815 if ((s = session_by_channel(c->self)) == NULL) {
1816 logit("session_input_channel_req: no session %d req %.100s",
1820 debug("session_input_channel_req: session %d req %s", s->self, rtype);
1823 * a session is in LARVAL state until a shell, a command
1824 * or a subsystem is executed
1826 if (c->type == SSH_CHANNEL_LARVAL) {
1827 if (strcmp(rtype, "shell") == 0) {
1828 success = session_shell_req(s);
1829 } else if (strcmp(rtype, "exec") == 0) {
1830 success = session_exec_req(s);
1831 } else if (strcmp(rtype, "pty-req") == 0) {
1832 success = session_pty_req(s);
1833 } else if (strcmp(rtype, "x11-req") == 0) {
1834 success = session_x11_req(s);
1835 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1836 success = session_auth_agent_req(s);
1837 } else if (strcmp(rtype, "subsystem") == 0) {
1838 success = session_subsystem_req(s);
1839 } else if (strcmp(rtype, "break") == 0) {
1840 success = session_break_req(s);
1843 if (strcmp(rtype, "window-change") == 0) {
1844 success = session_window_change_req(s);
1850 session_set_fds(Session *s, int fdin, int fdout, int fderr)
1853 fatal("session_set_fds: called for proto != 2.0");
1855 * now that have a child and a pipe to the child,
1856 * we can activate our channel and register the fd's
1858 if (s->chanid == -1)
1859 fatal("no channel for session %d", s->self);
1860 channel_set_fds(s->chanid,
1862 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1864 CHAN_SES_WINDOW_DEFAULT);
1868 * Function to perform pty cleanup. Also called if we get aborted abnormally
1869 * (e.g., due to a dropped connection).
1872 session_pty_cleanup2(Session *s)
1875 error("session_pty_cleanup: no session");
1881 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1883 /* Record that the user has logged out. */
1885 record_logout(s->pid, s->tty, s->pw->pw_name);
1887 /* Release the pseudo-tty. */
1889 pty_release(s->tty);
1892 * Close the server side of the socket pairs. We must do this after
1893 * the pty cleanup, so that another process doesn't get this pty
1894 * while we're still cleaning up.
1896 if (close(s->ptymaster) < 0)
1897 error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
1899 /* unlink pty from session */
1904 session_pty_cleanup(Session *s)
1906 PRIVSEP(session_pty_cleanup2(s));
1912 #define SSH_SIG(x) if (sig == SIG ## x) return #x
1927 return "SIG@openssh.com";
1931 session_exit_message(Session *s, int status)
1935 if ((c = channel_lookup(s->chanid)) == NULL)
1936 fatal("session_exit_message: session %d: no channel %d",
1937 s->self, s->chanid);
1938 debug("session_exit_message: session %d channel %d pid %ld",
1939 s->self, s->chanid, (long)s->pid);
1941 if (WIFEXITED(status)) {
1942 channel_request_start(s->chanid, "exit-status", 0);
1943 packet_put_int(WEXITSTATUS(status));
1945 } else if (WIFSIGNALED(status)) {
1946 channel_request_start(s->chanid, "exit-signal", 0);
1947 packet_put_cstring(sig2name(WTERMSIG(status)));
1949 packet_put_char(WCOREDUMP(status));
1950 #else /* WCOREDUMP */
1952 #endif /* WCOREDUMP */
1953 packet_put_cstring("");
1954 packet_put_cstring("");
1957 /* Some weird exit cause. Just exit. */
1958 packet_disconnect("wait returned status %04x.", status);
1961 /* disconnect channel */
1962 debug("session_exit_message: release channel %d", s->chanid);
1963 channel_cancel_cleanup(s->chanid);
1965 * emulate a write failure with 'chan_write_failed', nobody will be
1966 * interested in data we write.
1967 * Note that we must not call 'chan_read_failed', since there could
1968 * be some more data waiting in the pipe.
1970 if (c->ostate != CHAN_OUTPUT_CLOSED)
1971 chan_write_failed(c);
1976 session_close(Session *s)
1978 debug("session_close: session %d pid %ld", s->self, (long)s->pid);
1980 session_pty_cleanup(s);
1985 if (s->auth_display)
1986 xfree(s->auth_display);
1988 xfree(s->auth_data);
1990 xfree(s->auth_proto);
1992 session_proctitle(s);
1996 session_close_by_pid(pid_t pid, int status)
1998 Session *s = session_by_pid(pid);
2000 debug("session_close_by_pid: no session for pid %ld",
2004 if (s->chanid != -1)
2005 session_exit_message(s, status);
2010 * this is called when a channel dies before
2011 * the session 'child' itself dies
2014 session_close_by_channel(int id, void *arg)
2016 Session *s = session_by_channel(id);
2018 debug("session_close_by_channel: no session for id %d", id);
2021 debug("session_close_by_channel: channel %d child %ld",
2024 debug("session_close_by_channel: channel %d: has child", id);
2026 * delay detach of session, but release pty, since
2027 * the fd's to the child are already closed
2030 session_pty_cleanup(s);
2033 /* detach by removing callback */
2034 channel_cancel_cleanup(s->chanid);
2040 session_destroy_all(void (*closefunc)(Session *))
2043 for (i = 0; i < MAX_SESSIONS; i++) {
2044 Session *s = &sessions[i];
2046 if (closefunc != NULL)
2055 session_tty_list(void)
2057 static char buf[1024];
2062 for (i = 0; i < MAX_SESSIONS; i++) {
2063 Session *s = &sessions[i];
2064 if (s->used && s->ttyfd != -1) {
2066 if (strncmp(s->tty, "/dev/", 5) != 0) {
2067 cp = strrchr(s->tty, '/');
2068 cp = (cp == NULL) ? s->tty : cp + 1;
2073 strlcat(buf, ",", sizeof buf);
2074 strlcat(buf, cp, sizeof buf);
2078 strlcpy(buf, "notty", sizeof buf);
2083 session_proctitle(Session *s)
2086 error("no user for session %d", s->self);
2088 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
2092 session_setup_x11fwd(Session *s)
2095 char display[512], auth_display[512];
2096 char hostname[MAXHOSTNAMELEN];
2098 if (no_x11_forwarding_flag) {
2099 packet_send_debug("X11 forwarding disabled in user configuration file.");
2102 if (!options.x11_forwarding) {
2103 debug("X11 forwarding disabled in server configuration file.");
2106 if (!options.xauth_location ||
2107 (stat(options.xauth_location, &st) == -1)) {
2108 packet_send_debug("No xauth program; cannot forward with spoofing.");
2111 if (options.use_login) {
2112 packet_send_debug("X11 forwarding disabled; "
2113 "not compatible with UseLogin=yes.");
2116 if (s->display != NULL) {
2117 debug("X11 display already set.");
2120 if (x11_create_display_inet(options.x11_display_offset,
2121 options.x11_use_localhost, s->single_connection,
2122 &s->display_number) == -1) {
2123 debug("x11_create_display_inet failed.");
2127 /* Set up a suitable value for the DISPLAY variable. */
2128 if (gethostname(hostname, sizeof(hostname)) < 0)
2129 fatal("gethostname: %.100s", strerror(errno));
2131 * auth_display must be used as the displayname when the
2132 * authorization entry is added with xauth(1). This will be
2133 * different than the DISPLAY string for localhost displays.
2135 if (options.x11_use_localhost) {
2136 snprintf(display, sizeof display, "localhost:%u.%u",
2137 s->display_number, s->screen);
2138 snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
2139 s->display_number, s->screen);
2140 s->display = xstrdup(display);
2141 s->auth_display = xstrdup(auth_display);
2143 #ifdef IPADDR_IN_DISPLAY
2145 struct in_addr my_addr;
2147 he = gethostbyname(hostname);
2149 error("Can't get IP address for X11 DISPLAY.");
2150 packet_send_debug("Can't get IP address for X11 DISPLAY.");
2153 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
2154 snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr),
2155 s->display_number, s->screen);
2157 snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
2158 s->display_number, s->screen);
2160 s->display = xstrdup(display);
2161 s->auth_display = xstrdup(display);
2168 do_authenticated2(Authctxt *authctxt)
2170 server_loop2(authctxt);
2174 do_cleanup(Authctxt *authctxt)
2176 static int called = 0;
2178 debug("do_cleanup");
2180 /* no cleanup if we're in the child for login shell */
2184 /* avoid double cleanup */
2189 if (authctxt == NULL)
2192 if (options.kerberos_ticket_cleanup &&
2194 krb5_cleanup_proc(authctxt);
2198 if (compat20 && options.gss_cleanup_creds)
2199 ssh_gssapi_cleanup_creds();
2203 if (options.use_pam) {
2205 sshpam_thread_cleanup();
2209 /* remove agent socket */
2210 auth_sock_cleanup_proc(authctxt->pw);
2213 * Cleanup ptys/utmp only if privsep is disabled,
2214 * or if running in monitor.
2216 if (!use_privsep || mm_is_monitor())
2217 session_destroy_all(session_pty_cleanup2);