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 1.180 2004/07/28 09:40:29 markus Exp $");
51 #include "auth-options.h"
52 #include "pathnames.h"
56 #include "serverloop.h"
59 #include "monitor_wrap.h"
61 #if defined(KRB5) && defined(USE_AFS)
71 Session *session_new(void);
72 void session_set_fds(Session *, int, int, int);
73 void session_pty_cleanup(Session *);
74 void session_proctitle(Session *);
75 int session_setup_x11fwd(Session *);
76 void do_exec_pty(Session *, const char *);
77 void do_exec_no_pty(Session *, const char *);
78 void do_exec(Session *, const char *);
79 void do_login(Session *, const char *);
80 #ifdef LOGIN_NEEDS_UTMPX
81 static void do_pre_login(Session *s);
83 void do_child(Session *, const char *);
85 int check_quietlogin(Session *, const char *);
87 static void do_authenticated1(Authctxt *);
88 static void do_authenticated2(Authctxt *);
90 static int session_pty_req(Session *);
93 extern ServerOptions options;
94 extern char *__progname;
95 extern int log_stderr;
96 extern int debug_flag;
97 extern u_int utmp_len;
98 extern int startup_pipe;
99 extern void destroy_sensitive_data(void);
100 extern Buffer loginmsg;
102 /* original command from peer. */
103 const char *original_command = NULL;
106 #define MAX_SESSIONS 10
107 Session sessions[MAX_SESSIONS];
109 #ifdef HAVE_LOGIN_CAP
113 static int is_child = 0;
115 /* Name and directory of socket for authentication agent forwarding. */
116 static char *auth_sock_name = NULL;
117 static char *auth_sock_dir = NULL;
119 /* removes the agent forwarding socket */
122 auth_sock_cleanup_proc(struct passwd *pw)
124 if (auth_sock_name != NULL) {
125 temporarily_use_uid(pw);
126 unlink(auth_sock_name);
127 rmdir(auth_sock_dir);
128 auth_sock_name = NULL;
134 auth_input_request_forwarding(struct passwd * pw)
138 struct sockaddr_un sunaddr;
140 if (auth_sock_name != NULL) {
141 error("authentication forwarding requested twice.");
145 /* Temporarily drop privileged uid for mkdir/bind. */
146 temporarily_use_uid(pw);
148 /* Allocate a buffer for the socket name, and format the name. */
149 auth_sock_name = xmalloc(MAXPATHLEN);
150 auth_sock_dir = xmalloc(MAXPATHLEN);
151 strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
153 /* Create private directory for socket */
154 if (mkdtemp(auth_sock_dir) == NULL) {
155 packet_send_debug("Agent forwarding disabled: "
156 "mkdtemp() failed: %.100s", strerror(errno));
158 xfree(auth_sock_name);
159 xfree(auth_sock_dir);
160 auth_sock_name = NULL;
161 auth_sock_dir = NULL;
164 snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld",
165 auth_sock_dir, (long) getpid());
167 /* Create the socket. */
168 sock = socket(AF_UNIX, SOCK_STREAM, 0);
170 packet_disconnect("socket: %.100s", strerror(errno));
172 /* Bind it to the name. */
173 memset(&sunaddr, 0, sizeof(sunaddr));
174 sunaddr.sun_family = AF_UNIX;
175 strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
177 if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
178 packet_disconnect("bind: %.100s", strerror(errno));
180 /* Restore the privileged uid. */
183 /* Start listening on the socket. */
184 if (listen(sock, SSH_LISTEN_BACKLOG) < 0)
185 packet_disconnect("listen: %.100s", strerror(errno));
187 /* Allocate a channel for the authentication agent socket. */
188 nc = channel_new("auth socket",
189 SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
190 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
191 0, "auth socket", 1);
192 strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
197 display_loginmsg(void)
199 if (buffer_len(&loginmsg) > 0) {
200 buffer_append(&loginmsg, "\0", 1);
201 printf("%s", (char *)buffer_ptr(&loginmsg));
202 buffer_clear(&loginmsg);
207 do_authenticated(Authctxt *authctxt)
209 setproctitle("%s", authctxt->pw->pw_name);
212 * Cancel the alarm we set to limit the time taken for
216 if (startup_pipe != -1) {
220 /* setup the channel layer */
221 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
222 channel_permit_all_opens();
225 do_authenticated2(authctxt);
227 do_authenticated1(authctxt);
229 do_cleanup(authctxt);
233 * Prepares for an interactive session. This is called after the user has
234 * been successfully authenticated. During this message exchange, pseudo
235 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
236 * are requested, etc.
239 do_authenticated1(Authctxt *authctxt)
243 int success, type, screen_flag;
244 int enable_compression_after_reply = 0;
245 u_int proto_len, data_len, dlen, compression_level = 0;
248 s->authctxt = authctxt;
249 s->pw = authctxt->pw;
252 * We stay in this loop until the client requests to execute a shell
258 /* Get a packet from the client. */
259 type = packet_read();
261 /* Process the packet. */
263 case SSH_CMSG_REQUEST_COMPRESSION:
264 compression_level = packet_get_int();
266 if (compression_level < 1 || compression_level > 9) {
267 packet_send_debug("Received invalid compression level %d.",
271 if (!options.compression) {
272 debug2("compression disabled");
275 /* Enable compression after we have responded with SUCCESS. */
276 enable_compression_after_reply = 1;
280 case SSH_CMSG_REQUEST_PTY:
281 success = session_pty_req(s);
284 case SSH_CMSG_X11_REQUEST_FORWARDING:
285 s->auth_proto = packet_get_string(&proto_len);
286 s->auth_data = packet_get_string(&data_len);
288 screen_flag = packet_get_protocol_flags() &
289 SSH_PROTOFLAG_SCREEN_NUMBER;
290 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
292 if (packet_remaining() == 4) {
294 debug2("Buggy client: "
295 "X11 screen flag missing");
296 s->screen = packet_get_int();
301 success = session_setup_x11fwd(s);
303 xfree(s->auth_proto);
305 s->auth_proto = NULL;
310 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
311 if (no_agent_forwarding_flag || compat13) {
312 debug("Authentication agent forwarding not permitted for this authentication.");
315 debug("Received authentication agent forwarding request.");
316 success = auth_input_request_forwarding(s->pw);
319 case SSH_CMSG_PORT_FORWARD_REQUEST:
320 if (no_port_forwarding_flag) {
321 debug("Port forwarding not permitted for this authentication.");
324 if (!options.allow_tcp_forwarding) {
325 debug("Port forwarding not permitted.");
328 debug("Received TCP/IP port forwarding request.");
329 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
333 case SSH_CMSG_MAX_PACKET_SIZE:
334 if (packet_set_maxsize(packet_get_int()) > 0)
338 case SSH_CMSG_EXEC_SHELL:
339 case SSH_CMSG_EXEC_CMD:
340 if (type == SSH_CMSG_EXEC_CMD) {
341 command = packet_get_string(&dlen);
342 debug("Exec command '%.500s'", command);
354 * Any unknown messages in this phase are ignored,
355 * and a failure message is returned.
357 logit("Unknown packet type received after authentication: %d", type);
359 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
363 /* Enable compression now that we have replied if appropriate. */
364 if (enable_compression_after_reply) {
365 enable_compression_after_reply = 0;
366 packet_start_compression(compression_level);
372 * This is called to fork and execute a command when we have no tty. This
373 * will call do_child from the child, and server_loop from the parent after
374 * setting up file descriptors and such.
377 do_exec_no_pty(Session *s, const char *command)
382 int pin[2], pout[2], perr[2];
383 /* Allocate pipes for communicating with the program. */
384 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
385 packet_disconnect("Could not create pipes: %.100s",
387 #else /* USE_PIPES */
388 int inout[2], err[2];
389 /* Uses socket pairs to communicate with the program. */
390 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
391 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
392 packet_disconnect("Could not create socket pairs: %.100s",
394 #endif /* USE_PIPES */
396 fatal("do_exec_no_pty: no session");
398 session_proctitle(s);
401 if (options.use_pam && !use_privsep)
405 /* Fork the child. */
406 if ((pid = fork()) == 0) {
409 /* Child. Reinitialize the log since the pid has changed. */
410 log_init(__progname, options.log_level, options.log_facility, log_stderr);
413 * Create a new session and process group since the 4.4BSD
414 * setlogin() affects the entire process group.
417 error("setsid failed: %.100s", strerror(errno));
421 * Redirect stdin. We close the parent side of the socket
422 * pair, and make the child side the standard input.
425 if (dup2(pin[0], 0) < 0)
426 perror("dup2 stdin");
429 /* Redirect stdout. */
431 if (dup2(pout[1], 1) < 0)
432 perror("dup2 stdout");
435 /* Redirect stderr. */
437 if (dup2(perr[1], 2) < 0)
438 perror("dup2 stderr");
440 #else /* USE_PIPES */
442 * Redirect stdin, stdout, and stderr. Stdin and stdout will
443 * use the same socket, as some programs (particularly rdist)
444 * seem to depend on it.
448 if (dup2(inout[0], 0) < 0) /* stdin */
449 perror("dup2 stdin");
450 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
451 perror("dup2 stdout");
452 if (dup2(err[0], 2) < 0) /* stderr */
453 perror("dup2 stderr");
454 #endif /* USE_PIPES */
457 cray_init_job(s->pw); /* set up cray jid and tmpdir */
460 /* Do processing for the child (exec command etc). */
461 do_child(s, command);
465 signal(WJSIGNAL, cray_job_termination_handler);
469 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
472 packet_disconnect("fork failed: %.100s", strerror(errno));
474 /* Set interactive/non-interactive mode. */
475 packet_set_interactive(s->display != NULL);
477 /* We are the parent. Close the child sides of the pipes. */
483 if (s->is_subsystem) {
487 session_set_fds(s, pin[1], pout[0], perr[0]);
489 /* Enter the interactive session. */
490 server_loop(pid, pin[1], pout[0], perr[0]);
491 /* server_loop has closed pin[1], pout[0], and perr[0]. */
493 #else /* USE_PIPES */
494 /* We are the parent. Close the child sides of the socket pairs. */
499 * Clear loginmsg, since it's the child's responsibility to display
500 * it to the user, otherwise multiple sessions may accumulate
501 * multiple copies of the login messages.
503 buffer_clear(&loginmsg);
506 * Enter the interactive session. Note: server_loop must be able to
507 * handle the case that fdin and fdout are the same.
510 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
512 server_loop(pid, inout[1], inout[1], err[1]);
513 /* server_loop has closed inout[1] and err[1]. */
515 #endif /* USE_PIPES */
519 * This is called to fork and execute a command when we have a tty. This
520 * will call do_child from the child, and server_loop from the parent after
521 * setting up file descriptors, controlling tty, updating wtmp, utmp,
522 * lastlog, and other such operations.
525 do_exec_pty(Session *s, const char *command)
527 int fdout, ptyfd, ttyfd, ptymaster;
531 fatal("do_exec_pty: no session");
536 if (options.use_pam) {
537 do_pam_set_tty(s->tty);
543 /* Fork the child. */
544 if ((pid = fork()) == 0) {
547 /* Child. Reinitialize the log because the pid has changed. */
548 log_init(__progname, options.log_level, options.log_facility, log_stderr);
549 /* Close the master side of the pseudo tty. */
552 /* Make the pseudo tty our controlling tty. */
553 pty_make_controlling_tty(&ttyfd, s->tty);
555 /* Redirect stdin/stdout/stderr from the pseudo tty. */
556 if (dup2(ttyfd, 0) < 0)
557 error("dup2 stdin: %s", strerror(errno));
558 if (dup2(ttyfd, 1) < 0)
559 error("dup2 stdout: %s", strerror(errno));
560 if (dup2(ttyfd, 2) < 0)
561 error("dup2 stderr: %s", strerror(errno));
563 /* Close the extra descriptor for the pseudo tty. */
566 /* record login, etc. similar to login(1) */
568 if (!(options.use_login && command == NULL)) {
570 cray_init_job(s->pw); /* set up cray jid and tmpdir */
572 do_login(s, command);
574 # ifdef LOGIN_NEEDS_UTMPX
580 /* Do common processing for the child, such as execing the command. */
581 do_child(s, command);
585 signal(WJSIGNAL, cray_job_termination_handler);
589 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
592 packet_disconnect("fork failed: %.100s", strerror(errno));
595 /* Parent. Close the slave side of the pseudo tty. */
599 * Create another descriptor of the pty master side for use as the
600 * standard input. We could use the original descriptor, but this
601 * simplifies code in server_loop. The descriptor is bidirectional.
605 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
607 /* we keep a reference to the pty master */
608 ptymaster = dup(ptyfd);
610 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
611 s->ptymaster = ptymaster;
613 /* Enter interactive session. */
614 packet_set_interactive(1);
616 session_set_fds(s, ptyfd, fdout, -1);
618 server_loop(pid, ptyfd, fdout, -1);
619 /* server_loop _has_ closed ptyfd and fdout. */
623 #ifdef LOGIN_NEEDS_UTMPX
625 do_pre_login(Session *s)
628 struct sockaddr_storage from;
629 pid_t pid = getpid();
632 * Get IP address of client. If the connection is not a socket, let
633 * the address be 0.0.0.0.
635 memset(&from, 0, sizeof(from));
636 fromlen = sizeof(from);
637 if (packet_connection_is_on_socket()) {
638 if (getpeername(packet_get_connection_in(),
639 (struct sockaddr *) & from, &fromlen) < 0) {
640 debug("getpeername: %.100s", strerror(errno));
645 record_utmp_only(pid, s->tty, s->pw->pw_name,
646 get_remote_name_or_ip(utmp_len, options.use_dns),
647 (struct sockaddr *)&from, fromlen);
652 * This is called to fork and execute a command. If another command is
653 * to be forced, execute that instead.
656 do_exec(Session *s, const char *command)
658 if (forced_command) {
659 original_command = command;
660 command = forced_command;
661 debug("Forced command '%.900s'", command);
665 if (options.gss_authentication) {
666 temporarily_use_uid(s->pw);
667 ssh_gssapi_storecreds();
673 do_exec_pty(s, command);
675 do_exec_no_pty(s, command);
677 original_command = NULL;
680 * Clear loginmsg: it's the child's responsibility to display
681 * it to the user, otherwise multiple sessions may accumulate
682 * multiple copies of the login messages.
684 buffer_clear(&loginmsg);
687 /* administrative, login(1)-like work */
689 do_login(Session *s, const char *command)
692 struct sockaddr_storage from;
693 struct passwd * pw = s->pw;
694 pid_t pid = getpid();
697 * Get IP address of client. If the connection is not a socket, let
698 * the address be 0.0.0.0.
700 memset(&from, 0, sizeof(from));
701 fromlen = sizeof(from);
702 if (packet_connection_is_on_socket()) {
703 if (getpeername(packet_get_connection_in(),
704 (struct sockaddr *) & from, &fromlen) < 0) {
705 debug("getpeername: %.100s", strerror(errno));
710 /* Record that there was a login on that tty from the remote host. */
712 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
713 get_remote_name_or_ip(utmp_len,
715 (struct sockaddr *)&from, fromlen);
719 * If password change is needed, do it now.
720 * This needs to occur before the ~/.hushlogin check.
722 if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) {
725 s->authctxt->force_pwchange = 0;
726 /* XXX - signal [net] parent to enable forwardings */
730 if (check_quietlogin(s, command))
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.
985 p = fetch_windows_environment();
986 copy_environment(p, &env, &envsize);
987 free_windows_environment(p);
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)
1319 fprintf(stderr, "WARNING: Your password has expired.\n");
1320 if (s->ttyfd != -1) {
1322 "You must change your password now and login again!\n");
1323 execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
1327 "Password change required but no TTY available.\n");
1333 launch_login(struct passwd *pw, const char *hostname)
1335 /* Launch login(1). */
1337 execl(LOGIN_PROGRAM, "login", "-h", hostname,
1338 #ifdef xxxLOGIN_NEEDS_TERM
1339 (s->term ? s->term : "unknown"),
1340 #endif /* LOGIN_NEEDS_TERM */
1341 #ifdef LOGIN_NO_ENDOPT
1342 "-p", "-f", pw->pw_name, (char *)NULL);
1344 "-p", "-f", "--", pw->pw_name, (char *)NULL);
1347 /* Login couldn't be executed, die. */
1354 child_close_fds(void)
1358 if (packet_get_connection_in() == packet_get_connection_out())
1359 close(packet_get_connection_in());
1361 close(packet_get_connection_in());
1362 close(packet_get_connection_out());
1365 * Close all descriptors related to channels. They will still remain
1366 * open in the parent.
1368 /* XXX better use close-on-exec? -markus */
1369 channel_close_all();
1372 * Close any extra file descriptors. Note that there may still be
1373 * descriptors left by system functions. They will be closed later.
1378 * Close any extra open file descriptors so that we don\'t have them
1379 * hanging around in clients. Note that we want to do this after
1380 * initgroups, because at least on Solaris 2.3 it leaves file
1383 for (i = 3; i < 64; i++)
1388 * Performs common processing for the child, such as setting up the
1389 * environment, closing extra file descriptors, setting the user and group
1390 * ids, and executing the command or shell.
1393 do_child(Session *s, const char *command)
1395 extern char **environ;
1398 const char *shell, *shell0, *hostname = NULL;
1399 struct passwd *pw = s->pw;
1401 /* remove hostkey from the child's memory */
1402 destroy_sensitive_data();
1404 /* Force a password change */
1405 if (s->authctxt->force_pwchange) {
1406 do_setusercontext(pw);
1412 /* login(1) is only called if we execute the login shell */
1413 if (options.use_login && command != NULL)
1414 options.use_login = 0;
1417 cray_setup(pw->pw_uid, pw->pw_name, command);
1418 #endif /* _UNICOS */
1421 * Login(1) does this as well, and it needs uid 0 for the "-h"
1422 * switch, so we let login(1) to this for us.
1424 if (!options.use_login) {
1426 session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty);
1427 if (!check_quietlogin(s, command))
1429 #else /* HAVE_OSF_SIA */
1431 do_setusercontext(pw);
1433 * PAM session modules in do_setusercontext may have
1434 * generated messages, so if this in an interactive
1435 * login then display them too.
1437 if (!check_quietlogin(s, command))
1439 #endif /* HAVE_OSF_SIA */
1443 if (options.use_pam && !is_pam_session_open()) {
1450 * Get the shell from the password data. An empty shell field is
1451 * legal, and means /bin/sh.
1453 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1456 * Make sure $SHELL points to the shell from the password file,
1457 * even if shell is overridden from login.conf
1459 env = do_setup_env(s, shell);
1461 #ifdef HAVE_LOGIN_CAP
1462 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1465 /* we have to stash the hostname before we close our socket. */
1466 if (options.use_login)
1467 hostname = get_remote_name_or_ip(utmp_len,
1470 * Close the connection descriptors; note that this is the child, and
1471 * the server will still have the socket open, and it is important
1472 * that we do not shutdown it. Note that the descriptors cannot be
1473 * closed before building the environment, as we call
1474 * get_remote_ipaddr there.
1479 * Must take new environment into use so that .ssh/rc,
1480 * /etc/ssh/sshrc and xauth are run in the proper environment.
1484 #if defined(KRB5) && defined(USE_AFS)
1486 * At this point, we check to see if AFS is active and if we have
1487 * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1488 * if we can (and need to) extend the ticket into an AFS token. If
1489 * we don't do this, we run into potential problems if the user's
1490 * home directory is in AFS and it's not world-readable.
1493 if (options.kerberos_get_afs_token && k_hasafs() &&
1494 (s->authctxt->krb5_ctx != NULL)) {
1497 debug("Getting AFS token");
1501 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1502 krb5_afslog(s->authctxt->krb5_ctx,
1503 s->authctxt->krb5_fwd_ccache, cell, NULL);
1505 krb5_afslog_home(s->authctxt->krb5_ctx,
1506 s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1510 /* Change current directory to the user\'s home directory. */
1511 if (chdir(pw->pw_dir) < 0) {
1512 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1513 pw->pw_dir, strerror(errno));
1514 #ifdef HAVE_LOGIN_CAP
1515 if (login_getcapbool(lc, "requirehome", 0))
1520 if (!options.use_login)
1521 do_rc_files(s, shell);
1523 /* restore SIGPIPE for child */
1524 signal(SIGPIPE, SIG_DFL);
1526 if (options.use_login) {
1527 launch_login(pw, hostname);
1531 /* Get the last component of the shell name. */
1532 if ((shell0 = strrchr(shell, '/')) != NULL)
1538 * If we have no command, execute the shell. In this case, the shell
1539 * name to be passed in argv[0] is preceded by '-' to indicate that
1540 * this is a login shell.
1545 /* Start the shell. Set initial character to '-'. */
1548 if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1549 >= sizeof(argv0) - 1) {
1555 /* Execute the shell. */
1558 execve(shell, argv, env);
1560 /* Executing the shell failed. */
1565 * Execute the command using the user's shell. This uses the -c
1566 * option to execute the command.
1568 argv[0] = (char *) shell0;
1570 argv[2] = (char *) command;
1572 execve(shell, argv, env);
1581 static int did_init = 0;
1583 debug("session_new: init");
1584 for (i = 0; i < MAX_SESSIONS; i++) {
1585 sessions[i].used = 0;
1589 for (i = 0; i < MAX_SESSIONS; i++) {
1590 Session *s = &sessions[i];
1592 memset(s, 0, sizeof(*s));
1598 debug("session_new: session %d", i);
1609 for (i = 0; i < MAX_SESSIONS; i++) {
1610 Session *s = &sessions[i];
1611 debug("dump: used %d session %d %p channel %d pid %ld",
1621 session_open(Authctxt *authctxt, int chanid)
1623 Session *s = session_new();
1624 debug("session_open: channel %d", chanid);
1626 error("no more sessions");
1629 s->authctxt = authctxt;
1630 s->pw = authctxt->pw;
1631 if (s->pw == NULL || !authctxt->valid)
1632 fatal("no user for session %d", s->self);
1633 debug("session_open: session %d: link with channel %d", s->self, chanid);
1639 session_by_tty(char *tty)
1642 for (i = 0; i < MAX_SESSIONS; i++) {
1643 Session *s = &sessions[i];
1644 if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1645 debug("session_by_tty: session %d tty %s", i, tty);
1649 debug("session_by_tty: unknown tty %.100s", tty);
1655 session_by_channel(int id)
1658 for (i = 0; i < MAX_SESSIONS; i++) {
1659 Session *s = &sessions[i];
1660 if (s->used && s->chanid == id) {
1661 debug("session_by_channel: session %d channel %d", i, id);
1665 debug("session_by_channel: unknown channel %d", id);
1671 session_by_pid(pid_t pid)
1674 debug("session_by_pid: pid %ld", (long)pid);
1675 for (i = 0; i < MAX_SESSIONS; i++) {
1676 Session *s = &sessions[i];
1677 if (s->used && s->pid == pid)
1680 error("session_by_pid: unknown pid %ld", (long)pid);
1686 session_window_change_req(Session *s)
1688 s->col = packet_get_int();
1689 s->row = packet_get_int();
1690 s->xpixel = packet_get_int();
1691 s->ypixel = packet_get_int();
1693 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1698 session_pty_req(Session *s)
1704 debug("Allocating a pty not permitted for this authentication.");
1707 if (s->ttyfd != -1) {
1708 packet_disconnect("Protocol error: you already have a pty.");
1712 s->term = packet_get_string(&len);
1715 s->col = packet_get_int();
1716 s->row = packet_get_int();
1718 s->row = packet_get_int();
1719 s->col = packet_get_int();
1721 s->xpixel = packet_get_int();
1722 s->ypixel = packet_get_int();
1724 if (strcmp(s->term, "") == 0) {
1729 /* Allocate a pty and open it. */
1730 debug("Allocating pty.");
1731 if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
1737 error("session_pty_req: session %d alloc failed", s->self);
1740 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1742 /* for SSH1 the tty modes length is not given */
1744 n_bytes = packet_remaining();
1745 tty_parse_modes(s->ttyfd, &n_bytes);
1748 pty_setowner(s->pw, s->tty);
1750 /* Set window size from the packet. */
1751 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1754 session_proctitle(s);
1759 session_subsystem_req(Session *s)
1764 char *cmd, *subsys = packet_get_string(&len);
1768 logit("subsystem request for %.100s", subsys);
1770 for (i = 0; i < options.num_subsystems; i++) {
1771 if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1772 cmd = options.subsystem_command[i];
1773 if (stat(cmd, &st) < 0) {
1774 error("subsystem: cannot stat %s: %s", cmd,
1778 debug("subsystem: exec() %s", cmd);
1779 s->is_subsystem = 1;
1787 logit("subsystem request for %.100s failed, subsystem not found",
1795 session_x11_req(Session *s)
1799 s->single_connection = packet_get_char();
1800 s->auth_proto = packet_get_string(NULL);
1801 s->auth_data = packet_get_string(NULL);
1802 s->screen = packet_get_int();
1805 success = session_setup_x11fwd(s);
1807 xfree(s->auth_proto);
1808 xfree(s->auth_data);
1809 s->auth_proto = NULL;
1810 s->auth_data = NULL;
1816 session_shell_req(Session *s)
1824 session_exec_req(Session *s)
1827 char *command = packet_get_string(&len);
1829 do_exec(s, command);
1835 session_break_req(Session *s)
1838 packet_get_int(); /* ignored */
1841 if (s->ttyfd == -1 ||
1842 tcsendbreak(s->ttyfd, 0) < 0)
1848 session_env_req(Session *s)
1851 u_int name_len, val_len, i;
1853 name = packet_get_string(&name_len);
1854 val = packet_get_string(&val_len);
1857 /* Don't set too many environment variables */
1858 if (s->num_env > 128) {
1859 debug2("Ignoring env request %s: too many env vars", name);
1863 for (i = 0; i < options.num_accept_env; i++) {
1864 if (match_pattern(name, options.accept_env[i])) {
1865 debug2("Setting env %d: %s=%s", s->num_env, name, val);
1866 s->env = xrealloc(s->env, sizeof(*s->env) *
1868 s->env[s->num_env].name = name;
1869 s->env[s->num_env].val = val;
1874 debug2("Ignoring env request %s: disallowed name", name);
1883 session_auth_agent_req(Session *s)
1885 static int called = 0;
1887 if (no_agent_forwarding_flag) {
1888 debug("session_auth_agent_req: no_agent_forwarding_flag");
1895 return auth_input_request_forwarding(s->pw);
1900 session_input_channel_req(Channel *c, const char *rtype)
1905 if ((s = session_by_channel(c->self)) == NULL) {
1906 logit("session_input_channel_req: no session %d req %.100s",
1910 debug("session_input_channel_req: session %d req %s", s->self, rtype);
1913 * a session is in LARVAL state until a shell, a command
1914 * or a subsystem is executed
1916 if (c->type == SSH_CHANNEL_LARVAL) {
1917 if (strcmp(rtype, "shell") == 0) {
1918 success = session_shell_req(s);
1919 } else if (strcmp(rtype, "exec") == 0) {
1920 success = session_exec_req(s);
1921 } else if (strcmp(rtype, "pty-req") == 0) {
1922 success = session_pty_req(s);
1923 } else if (strcmp(rtype, "x11-req") == 0) {
1924 success = session_x11_req(s);
1925 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1926 success = session_auth_agent_req(s);
1927 } else if (strcmp(rtype, "subsystem") == 0) {
1928 success = session_subsystem_req(s);
1929 } else if (strcmp(rtype, "env") == 0) {
1930 success = session_env_req(s);
1933 if (strcmp(rtype, "window-change") == 0) {
1934 success = session_window_change_req(s);
1935 } else if (strcmp(rtype, "break") == 0) {
1936 success = session_break_req(s);
1943 session_set_fds(Session *s, int fdin, int fdout, int fderr)
1946 fatal("session_set_fds: called for proto != 2.0");
1948 * now that have a child and a pipe to the child,
1949 * we can activate our channel and register the fd's
1951 if (s->chanid == -1)
1952 fatal("no channel for session %d", s->self);
1953 channel_set_fds(s->chanid,
1955 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1957 CHAN_SES_WINDOW_DEFAULT);
1961 * Function to perform pty cleanup. Also called if we get aborted abnormally
1962 * (e.g., due to a dropped connection).
1965 session_pty_cleanup2(Session *s)
1968 error("session_pty_cleanup: no session");
1974 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1976 /* Record that the user has logged out. */
1978 record_logout(s->pid, s->tty, s->pw->pw_name);
1980 /* Release the pseudo-tty. */
1982 pty_release(s->tty);
1985 * Close the server side of the socket pairs. We must do this after
1986 * the pty cleanup, so that another process doesn't get this pty
1987 * while we're still cleaning up.
1989 if (close(s->ptymaster) < 0)
1990 error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
1992 /* unlink pty from session */
1997 session_pty_cleanup(Session *s)
1999 PRIVSEP(session_pty_cleanup2(s));
2005 #define SSH_SIG(x) if (sig == SIG ## x) return #x
2020 return "SIG@openssh.com";
2024 session_exit_message(Session *s, int status)
2028 if ((c = channel_lookup(s->chanid)) == NULL)
2029 fatal("session_exit_message: session %d: no channel %d",
2030 s->self, s->chanid);
2031 debug("session_exit_message: session %d channel %d pid %ld",
2032 s->self, s->chanid, (long)s->pid);
2034 if (WIFEXITED(status)) {
2035 channel_request_start(s->chanid, "exit-status", 0);
2036 packet_put_int(WEXITSTATUS(status));
2038 } else if (WIFSIGNALED(status)) {
2039 channel_request_start(s->chanid, "exit-signal", 0);
2040 packet_put_cstring(sig2name(WTERMSIG(status)));
2042 packet_put_char(WCOREDUMP(status));
2043 #else /* WCOREDUMP */
2045 #endif /* WCOREDUMP */
2046 packet_put_cstring("");
2047 packet_put_cstring("");
2050 /* Some weird exit cause. Just exit. */
2051 packet_disconnect("wait returned status %04x.", status);
2054 /* disconnect channel */
2055 debug("session_exit_message: release channel %d", s->chanid);
2056 channel_cancel_cleanup(s->chanid);
2058 * emulate a write failure with 'chan_write_failed', nobody will be
2059 * interested in data we write.
2060 * Note that we must not call 'chan_read_failed', since there could
2061 * be some more data waiting in the pipe.
2063 if (c->ostate != CHAN_OUTPUT_CLOSED)
2064 chan_write_failed(c);
2069 session_close(Session *s)
2073 debug("session_close: session %d pid %ld", s->self, (long)s->pid);
2075 session_pty_cleanup(s);
2080 if (s->auth_display)
2081 xfree(s->auth_display);
2083 xfree(s->auth_data);
2085 xfree(s->auth_proto);
2087 for (i = 0; i < s->num_env; i++) {
2088 xfree(s->env[i].name);
2089 xfree(s->env[i].val);
2093 session_proctitle(s);
2097 session_close_by_pid(pid_t pid, int status)
2099 Session *s = session_by_pid(pid);
2101 debug("session_close_by_pid: no session for pid %ld",
2105 if (s->chanid != -1)
2106 session_exit_message(s, status);
2111 * this is called when a channel dies before
2112 * the session 'child' itself dies
2115 session_close_by_channel(int id, void *arg)
2117 Session *s = session_by_channel(id);
2119 debug("session_close_by_channel: no session for id %d", id);
2122 debug("session_close_by_channel: channel %d child %ld",
2125 debug("session_close_by_channel: channel %d: has child", id);
2127 * delay detach of session, but release pty, since
2128 * the fd's to the child are already closed
2131 session_pty_cleanup(s);
2134 /* detach by removing callback */
2135 channel_cancel_cleanup(s->chanid);
2141 session_destroy_all(void (*closefunc)(Session *))
2144 for (i = 0; i < MAX_SESSIONS; i++) {
2145 Session *s = &sessions[i];
2147 if (closefunc != NULL)
2156 session_tty_list(void)
2158 static char buf[1024];
2163 for (i = 0; i < MAX_SESSIONS; i++) {
2164 Session *s = &sessions[i];
2165 if (s->used && s->ttyfd != -1) {
2167 if (strncmp(s->tty, "/dev/", 5) != 0) {
2168 cp = strrchr(s->tty, '/');
2169 cp = (cp == NULL) ? s->tty : cp + 1;
2174 strlcat(buf, ",", sizeof buf);
2175 strlcat(buf, cp, sizeof buf);
2179 strlcpy(buf, "notty", sizeof buf);
2184 session_proctitle(Session *s)
2187 error("no user for session %d", s->self);
2189 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
2193 session_setup_x11fwd(Session *s)
2196 char display[512], auth_display[512];
2197 char hostname[MAXHOSTNAMELEN];
2199 if (no_x11_forwarding_flag) {
2200 packet_send_debug("X11 forwarding disabled in user configuration file.");
2203 if (!options.x11_forwarding) {
2204 debug("X11 forwarding disabled in server configuration file.");
2207 if (!options.xauth_location ||
2208 (stat(options.xauth_location, &st) == -1)) {
2209 packet_send_debug("No xauth program; cannot forward with spoofing.");
2212 if (options.use_login) {
2213 packet_send_debug("X11 forwarding disabled; "
2214 "not compatible with UseLogin=yes.");
2217 if (s->display != NULL) {
2218 debug("X11 display already set.");
2221 if (x11_create_display_inet(options.x11_display_offset,
2222 options.x11_use_localhost, s->single_connection,
2223 &s->display_number) == -1) {
2224 debug("x11_create_display_inet failed.");
2228 /* Set up a suitable value for the DISPLAY variable. */
2229 if (gethostname(hostname, sizeof(hostname)) < 0)
2230 fatal("gethostname: %.100s", strerror(errno));
2232 * auth_display must be used as the displayname when the
2233 * authorization entry is added with xauth(1). This will be
2234 * different than the DISPLAY string for localhost displays.
2236 if (options.x11_use_localhost) {
2237 snprintf(display, sizeof display, "localhost:%u.%u",
2238 s->display_number, s->screen);
2239 snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
2240 s->display_number, s->screen);
2241 s->display = xstrdup(display);
2242 s->auth_display = xstrdup(auth_display);
2244 #ifdef IPADDR_IN_DISPLAY
2246 struct in_addr my_addr;
2248 he = gethostbyname(hostname);
2250 error("Can't get IP address for X11 DISPLAY.");
2251 packet_send_debug("Can't get IP address for X11 DISPLAY.");
2254 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
2255 snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr),
2256 s->display_number, s->screen);
2258 snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
2259 s->display_number, s->screen);
2261 s->display = xstrdup(display);
2262 s->auth_display = xstrdup(display);
2269 do_authenticated2(Authctxt *authctxt)
2271 server_loop2(authctxt);
2275 do_cleanup(Authctxt *authctxt)
2277 static int called = 0;
2279 debug("do_cleanup");
2281 /* no cleanup if we're in the child for login shell */
2285 /* avoid double cleanup */
2290 if (authctxt == NULL)
2293 if (options.kerberos_ticket_cleanup &&
2295 krb5_cleanup_proc(authctxt);
2299 if (compat20 && options.gss_cleanup_creds)
2300 ssh_gssapi_cleanup_creds();
2304 if (options.use_pam) {
2306 sshpam_thread_cleanup();
2310 /* remove agent socket */
2311 auth_sock_cleanup_proc(authctxt->pw);
2314 * Cleanup ptys/utmp only if privsep is disabled,
2315 * or if running in monitor.
2317 if (!use_privsep || mm_is_monitor())
2318 session_destroy_all(session_pty_cleanup2);