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 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 1.46 2001/01/04 22:41:03 markus Exp $");
53 #include "auth-options.h"
55 #ifdef WITH_IRIX_PROJECT
57 #endif /* WITH_IRIX_PROJECT */
59 #include <sys/resource.h>
61 #ifdef WITH_IRIX_AUDIT
63 #endif /* WITH_IRIX_AUDIT */
65 #if defined(HAVE_USERSEC_H)
76 #include <sys/cygwin.h>
77 #define is_winnt (GetVersion() < 0x80000000)
81 #if defined(HAVE_GETUSERATTR) && !defined(S_UFSIZE_HARD) && defined(S_UFSIZE)
82 # define S_UFSIZE_HARD S_UFSIZE "_hard"
83 # define S_UCPU_HARD S_UCPU "_hard"
84 # define S_UDATA_HARD S_UDATA "_hard"
85 # define S_USTACK_HARD S_USTACK "_hard"
86 # define S_URSS_HARD S_URSS "_hard"
87 # define S_UCORE_HARD S_UCORE "_hard"
88 # define S_UNOFILE_HARD S_UNOFILE "_hard"
92 #include <login_cap.h>
98 typedef struct Session Session;
107 int ptyfd, ttyfd, ptymaster;
108 int row, col, xpixel, ypixel;
115 int single_connection;
122 Session *session_new(void);
123 void session_set_fds(Session *s, int fdin, int fdout, int fderr);
124 void session_pty_cleanup(Session *s);
125 void session_proctitle(Session *s);
126 void do_exec_pty(Session *s, const char *command, struct passwd * pw);
127 void do_exec_no_pty(Session *s, const char *command, struct passwd * pw);
128 void do_login(Session *s, const char *command);
131 do_child(const char *command, struct passwd * pw, const char *term,
132 const char *display, const char *auth_proto,
133 const char *auth_data, const char *ttyname);
136 extern ServerOptions options;
137 extern char *__progname;
138 extern int log_stderr;
139 extern int debug_flag;
140 extern u_int utmp_len;
142 extern int startup_pipe;
144 /* Local Xauthority file. */
145 static char *xauthfile;
147 /* original command from peer. */
148 char *original_command = NULL;
151 #define MAX_SESSIONS 10
152 Session sessions[MAX_SESSIONS];
154 #ifdef WITH_AIXAUTHENTICATE
155 /* AIX's lastlogin message, set in auth1.c */
157 #endif /* WITH_AIXAUTHENTICATE */
159 #ifdef HAVE_LOGIN_CAP
160 static login_cap_t *lc;
164 * Remove local Xauthority file.
167 xauthfile_cleanup_proc(void *ignore)
169 debug("xauthfile_cleanup_proc called");
171 if (xauthfile != NULL) {
174 p = strrchr(xauthfile, '/');
185 * Function to perform cleanup if we get aborted abnormally (e.g., due to a
186 * dropped connection).
189 pty_cleanup_proc(void *session)
193 fatal("pty_cleanup_proc: no session");
194 debug("pty_cleanup_proc: %s", s->tty);
197 /* Record that the user has logged out. */
198 record_logout(s->pid, s->tty);
201 /* Release the pseudo-tty. */
206 * Prepares for an interactive session. This is called after the user has
207 * been successfully authenticated. During this message exchange, pseudo
208 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
209 * are requested, etc.
212 do_authenticated(struct passwd * pw)
216 int compression_level = 0, enable_compression_after_reply = 0;
221 u_int proto_len, data_len, dlen;
224 * Cancel the alarm we set to limit the time taken for
228 if (startup_pipe != -1) {
234 * Inform the channel mechanism that we are the server side and that
235 * the client may request to connect to any port at all. (The user
236 * could do it anyway, and we wouldn\'t know what is permitted except
237 * by the client telling us, so we can equally well trust the client
238 * not to request anything bogus.)
240 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
241 channel_permit_all_opens();
246 #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD)
247 if ((lc = login_getclass(pw->pw_class)) == NULL) {
248 error("unable to get login class");
254 * We stay in this loop until the client requests to execute a shell
260 /* Get a packet from the client. */
261 type = packet_read(&plen);
263 /* Process the packet. */
265 case SSH_CMSG_REQUEST_COMPRESSION:
266 packet_integrity_check(plen, 4, type);
267 compression_level = packet_get_int();
268 if (compression_level < 1 || compression_level > 9) {
269 packet_send_debug("Received illegal compression level %d.",
273 /* Enable compression after we have responded with SUCCESS. */
274 enable_compression_after_reply = 1;
278 case SSH_CMSG_REQUEST_PTY:
280 debug("Allocating a pty not permitted for this authentication.");
284 packet_disconnect("Protocol error: you already have a pty.");
286 debug("Allocating pty.");
288 /* Allocate a pty and open it. */
289 if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty,
291 error("Failed to allocate pty.");
294 fatal_add_cleanup(pty_cleanup_proc, (void *)s);
295 pty_setowner(pw, s->tty);
297 /* Get TERM from the packet. Note that the value may be of arbitrary length. */
298 s->term = packet_get_string(&dlen);
299 packet_integrity_check(dlen, strlen(s->term), type);
300 /* packet_integrity_check(plen, 4 + dlen + 4*4 + n_bytes, type); */
301 /* Remaining bytes */
302 n_bytes = plen - (4 + dlen + 4 * 4);
304 if (strcmp(s->term, "") == 0) {
308 /* Get window size from the packet. */
309 s->row = packet_get_int();
310 s->col = packet_get_int();
311 s->xpixel = packet_get_int();
312 s->ypixel = packet_get_int();
313 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
315 /* Get tty modes from the packet. */
316 tty_parse_modes(s->ttyfd, &n_bytes);
317 packet_integrity_check(plen, 4 + dlen + 4 * 4 + n_bytes, type);
319 session_proctitle(s);
321 /* Indicate that we now have a pty. */
326 case SSH_CMSG_X11_REQUEST_FORWARDING:
327 if (!options.x11_forwarding) {
328 packet_send_debug("X11 forwarding disabled in server configuration file.");
331 if (!options.xauth_location) {
332 packet_send_debug("No xauth program; cannot forward with spoofing.");
335 if (no_x11_forwarding_flag) {
336 packet_send_debug("X11 forwarding not permitted for this authentication.");
339 debug("Received request for X11 forwarding with auth spoofing.");
340 if (s->display != NULL)
341 packet_disconnect("Protocol error: X11 display already set.");
343 s->auth_proto = packet_get_string(&proto_len);
344 s->auth_data = packet_get_string(&data_len);
345 packet_integrity_check(plen, 4 + proto_len + 4 + data_len + 4, type);
347 if (packet_get_protocol_flags() & SSH_PROTOFLAG_SCREEN_NUMBER)
348 s->screen = packet_get_int();
351 s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
353 if (s->display == NULL)
356 /* Setup to always have a local .Xauthority. */
357 xauthfile = xmalloc(MAXPATHLEN);
358 strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
359 temporarily_use_uid(pw->pw_uid);
360 if (mkdtemp(xauthfile) == NULL) {
362 error("private X11 dir: mkdtemp %s failed: %s",
363 xauthfile, strerror(errno));
366 /* XXXX remove listening channels */
369 strlcat(xauthfile, "/cookies", MAXPATHLEN);
370 fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
374 fatal_add_cleanup(xauthfile_cleanup_proc, NULL);
378 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
379 if (no_agent_forwarding_flag || compat13) {
380 debug("Authentication agent forwarding not permitted for this authentication.");
383 debug("Received authentication agent forwarding request.");
384 success = auth_input_request_forwarding(pw);
387 case SSH_CMSG_PORT_FORWARD_REQUEST:
388 if (no_port_forwarding_flag) {
389 debug("Port forwarding not permitted for this authentication.");
392 if (!options.allow_tcp_forwarding) {
393 debug("Port forwarding not permitted.");
396 debug("Received TCP/IP port forwarding request.");
397 channel_input_port_forward_request(pw->pw_uid == 0, options.gateway_ports);
401 case SSH_CMSG_MAX_PACKET_SIZE:
402 if (packet_set_maxsize(packet_get_int()) > 0)
406 case SSH_CMSG_EXEC_SHELL:
407 case SSH_CMSG_EXEC_CMD:
408 /* Set interactive/non-interactive mode. */
409 packet_set_interactive(have_pty || s->display != NULL,
412 if (type == SSH_CMSG_EXEC_CMD) {
413 command = packet_get_string(&dlen);
414 debug("Exec command '%.500s'", command);
415 packet_integrity_check(plen, 4 + dlen, type);
418 packet_integrity_check(plen, 0, type);
420 if (forced_command != NULL) {
421 original_command = command;
422 command = forced_command;
423 debug("Forced command '%.500s'", forced_command);
426 do_exec_pty(s, command, pw);
428 do_exec_no_pty(s, command, pw);
432 /* Cleanup user's local Xauthority file. */
434 xauthfile_cleanup_proc(NULL);
439 * Any unknown messages in this phase are ignored,
440 * and a failure message is returned.
442 log("Unknown packet type received after authentication: %d", type);
444 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
448 /* Enable compression now that we have replied if appropriate. */
449 if (enable_compression_after_reply) {
450 enable_compression_after_reply = 0;
451 packet_start_compression(compression_level);
457 * This is called to fork and execute a command when we have no tty. This
458 * will call do_child from the child, and server_loop from the parent after
459 * setting up file descriptors and such.
462 do_exec_no_pty(Session *s, const char *command, struct passwd * pw)
467 int pin[2], pout[2], perr[2];
468 /* Allocate pipes for communicating with the program. */
469 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
470 packet_disconnect("Could not create pipes: %.100s",
472 #else /* USE_PIPES */
473 int inout[2], err[2];
474 /* Uses socket pairs to communicate with the program. */
475 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
476 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
477 packet_disconnect("Could not create socket pairs: %.100s",
479 #endif /* USE_PIPES */
481 fatal("do_exec_no_pty: no session");
483 session_proctitle(s);
489 /* Fork the child. */
490 if ((pid = fork()) == 0) {
491 /* Child. Reinitialize the log since the pid has changed. */
492 log_init(__progname, options.log_level, options.log_facility, log_stderr);
494 signal(SIGPIPE, SIG_DFL);
497 * Create a new session and process group since the 4.4BSD
498 * setlogin() affects the entire process group.
501 error("setsid failed: %.100s", strerror(errno));
505 * Redirect stdin. We close the parent side of the socket
506 * pair, and make the child side the standard input.
509 if (dup2(pin[0], 0) < 0)
510 perror("dup2 stdin");
513 /* Redirect stdout. */
515 if (dup2(pout[1], 1) < 0)
516 perror("dup2 stdout");
519 /* Redirect stderr. */
521 if (dup2(perr[1], 2) < 0)
522 perror("dup2 stderr");
524 #else /* USE_PIPES */
526 * Redirect stdin, stdout, and stderr. Stdin and stdout will
527 * use the same socket, as some programs (particularly rdist)
528 * seem to depend on it.
532 if (dup2(inout[0], 0) < 0) /* stdin */
533 perror("dup2 stdin");
534 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
535 perror("dup2 stdout");
536 if (dup2(err[0], 2) < 0) /* stderr */
537 perror("dup2 stderr");
538 #endif /* USE_PIPES */
540 /* Do processing for the child (exec command etc). */
541 do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL);
546 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
549 packet_disconnect("fork failed: %.100s", strerror(errno));
552 /* We are the parent. Close the child sides of the pipes. */
558 session_set_fds(s, pin[1], pout[0], s->extended ? perr[0] : -1);
560 /* Enter the interactive session. */
561 server_loop(pid, pin[1], pout[0], perr[0]);
562 /* server_loop has closed pin[1], pout[1], and perr[1]. */
564 #else /* USE_PIPES */
565 /* We are the parent. Close the child sides of the socket pairs. */
570 * Enter the interactive session. Note: server_loop must be able to
571 * handle the case that fdin and fdout are the same.
574 session_set_fds(s, inout[1], inout[1], s->extended ? err[1] : -1);
576 server_loop(pid, inout[1], inout[1], err[1]);
577 /* server_loop has closed inout[1] and err[1]. */
579 #endif /* USE_PIPES */
583 * This is called to fork and execute a command when we have a tty. This
584 * will call do_child from the child, and server_loop from the parent after
585 * setting up file descriptors, controlling tty, updating wtmp, utmp,
586 * lastlog, and other such operations.
589 do_exec_pty(Session *s, const char *command, struct passwd * pw)
591 int fdout, ptyfd, ttyfd, ptymaster;
595 fatal("do_exec_pty: no session");
600 do_pam_session(pw->pw_name, s->tty);
604 /* Fork the child. */
605 if ((pid = fork()) == 0) {
606 /* Child. Reinitialize the log because the pid has changed. */
607 log_init(__progname, options.log_level, options.log_facility, log_stderr);
609 signal(SIGPIPE, SIG_DFL);
611 /* Close the master side of the pseudo tty. */
614 /* Make the pseudo tty our controlling tty. */
615 pty_make_controlling_tty(&ttyfd, s->tty);
617 /* Redirect stdin from the pseudo tty. */
618 if (dup2(ttyfd, fileno(stdin)) < 0)
619 error("dup2 stdin failed: %.100s", strerror(errno));
621 /* Redirect stdout to the pseudo tty. */
622 if (dup2(ttyfd, fileno(stdout)) < 0)
623 error("dup2 stdin failed: %.100s", strerror(errno));
625 /* Redirect stderr to the pseudo tty. */
626 if (dup2(ttyfd, fileno(stderr)) < 0)
627 error("dup2 stdin failed: %.100s", strerror(errno));
629 /* Close the extra descriptor for the pseudo tty. */
632 /* record login, etc. similar to login(1) */
633 if (!(options.use_login && command == NULL))
634 do_login(s, command);
636 /* Do common processing for the child, such as execing the command. */
637 do_child(command, pw, s->term, s->display, s->auth_proto,
638 s->auth_data, s->tty);
643 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
646 packet_disconnect("fork failed: %.100s", strerror(errno));
649 /* Parent. Close the slave side of the pseudo tty. */
653 * Create another descriptor of the pty master side for use as the
654 * standard input. We could use the original descriptor, but this
655 * simplifies code in server_loop. The descriptor is bidirectional.
659 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
661 /* we keep a reference to the pty master */
662 ptymaster = dup(ptyfd);
664 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
665 s->ptymaster = ptymaster;
667 /* Enter interactive session. */
669 session_set_fds(s, ptyfd, fdout, -1);
671 server_loop(pid, ptyfd, fdout, -1);
672 /* server_loop _has_ closed ptyfd and fdout. */
673 session_pty_cleanup(s);
678 get_remote_name_or_ip(void)
680 static const char *remote = "";
682 remote = get_canonical_hostname();
683 if (utmp_len == 0 || strlen(remote) > utmp_len)
684 remote = get_remote_ipaddr();
688 /* administrative, login(1)-like work */
690 do_login(Session *s, const char *command)
695 char hostname[MAXHOSTNAMELEN];
697 struct sockaddr_storage from;
699 time_t last_login_time;
700 struct passwd * pw = s->pw;
701 pid_t pid = getpid();
704 * Get IP address of client. If the connection is not a socket, let
705 * the address be 0.0.0.0.
707 memset(&from, 0, sizeof(from));
708 if (packet_connection_is_on_socket()) {
709 fromlen = sizeof(from);
710 if (getpeername(packet_get_connection_in(),
711 (struct sockaddr *) & from, &fromlen) < 0) {
712 debug("getpeername: %.100s", strerror(errno));
717 /* Get the time and hostname when the user last logged in. */
719 last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name,
720 hostname, sizeof(hostname));
722 /* Record that there was a login on that tty from the remote host. */
723 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
724 get_remote_name_or_ip(), (struct sockaddr *)&from);
728 * If password change is needed, do it now.
729 * This needs to occur before the ~/.hushlogin check.
731 if (pam_password_change_required()) {
732 print_pam_messages();
737 /* Done if .hushlogin exists or a command given. */
740 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
741 #ifdef HAVE_LOGIN_CAP
742 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
744 if (stat(buf, &st) >= 0)
749 if (!pam_password_change_required())
750 print_pam_messages();
752 #ifdef WITH_AIXAUTHENTICATE
753 if (aixloginmsg && *aixloginmsg)
754 printf("%s\n", aixloginmsg);
755 #endif /* WITH_AIXAUTHENTICATE */
757 if (last_login_time != 0) {
758 time_string = ctime(&last_login_time);
759 if (strchr(time_string, '\n'))
760 *strchr(time_string, '\n') = 0;
761 if (strcmp(hostname, "") == 0)
762 printf("Last login: %s\r\n", time_string);
764 printf("Last login: %s from %s\r\n", time_string, hostname);
766 if (options.print_motd) {
767 #ifdef HAVE_LOGIN_CAP
768 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
771 f = fopen("/etc/motd", "r");
774 while (fgets(buf, sizeof(buf), f))
782 * Sets the value of the given variable in the environment. If the variable
783 * already exists, its value is overriden.
786 child_set_env(char ***envp, u_int *envsizep, const char *name,
793 * Find the slot where the value should be stored. If the variable
794 * already exists, we reuse the slot; otherwise we append a new slot
795 * at the end of the array, expanding if necessary.
798 namelen = strlen(name);
799 for (i = 0; env[i]; i++)
800 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
803 /* Reuse the slot. */
806 /* New variable. Expand if necessary. */
807 if (i >= (*envsizep) - 1) {
809 env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
811 /* Need to set the NULL pointer at end of array beyond the new slot. */
815 /* Allocate space and format the variable in the appropriate slot. */
816 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
817 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
821 * Reads environment variables from the given file and adds/overrides them
822 * into the environment. If the file does not exist, this does nothing.
823 * Otherwise, it must consist of empty lines, comments (line starts with '#')
824 * and assignments of the form name=value. No other forms are allowed.
827 read_environment_file(char ***env, u_int *envsize,
828 const char *filename)
834 f = fopen(filename, "r");
838 while (fgets(buf, sizeof(buf), f)) {
839 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
841 if (!*cp || *cp == '#' || *cp == '\n')
843 if (strchr(cp, '\n'))
844 *strchr(cp, '\n') = '\0';
845 value = strchr(cp, '=');
847 fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf);
851 * Replace the equals sign by nul, and advance value to
856 child_set_env(env, envsize, cp, value);
863 * Sets any environment variables which have been specified by PAM
865 void do_pam_environment(char ***env, int *envsize)
867 char *equals, var_name[512], var_val[512];
871 if ((pam_env = fetch_pam_environment()) == NULL)
874 for(i = 0; pam_env[i] != NULL; i++) {
875 if ((equals = strstr(pam_env[i], "=")) == NULL)
878 if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) {
879 memset(var_name, '\0', sizeof(var_name));
880 memset(var_val, '\0', sizeof(var_val));
882 strncpy(var_name, pam_env[i], equals - pam_env[i]);
883 strcpy(var_val, equals + 1);
885 debug3("PAM environment: %s=%s", var_name, var_val);
887 child_set_env(env, envsize, var_name, var_val);
895 void copy_environment(char ***env, int *envsize)
897 char *equals, var_name[512], var_val[512];
900 for(i = 0; environ[i] != NULL; i++) {
901 if ((equals = strstr(environ[i], "=")) == NULL)
904 if (strlen(environ[i]) < (sizeof(var_name) - 1)) {
905 memset(var_name, '\0', sizeof(var_name));
906 memset(var_val, '\0', sizeof(var_val));
908 strncpy(var_name, environ[i], equals - environ[i]);
909 strcpy(var_val, equals + 1);
911 debug3("Copy environment: %s=%s", var_name, var_val);
913 child_set_env(env, envsize, var_name, var_val);
919 #if defined(HAVE_GETUSERATTR)
921 * AIX-specific login initialisation
923 void set_limit(char *user, char *soft, char *hard, int resource, int mult)
928 getrlimit(resource, &rlim);
931 if (getuserattr(user, soft, &slim, SEC_INT) != -1) {
933 rlim.rlim_cur = RLIM_INFINITY;
934 } else if (slim != 0) {
935 /* See the wackiness below */
936 if (rlim.rlim_cur == slim * mult)
939 rlim.rlim_cur = slim * mult;
944 if (getuserattr(user, hard, &hlim, SEC_INT) != -1) {
946 rlim.rlim_max = RLIM_INFINITY;
947 } else if (hlim != 0) {
948 rlim.rlim_max = hlim * mult;
953 * XXX For cpu and fsize the soft limit is set to the hard limit
954 * if the hard limit is left at its default value and the soft limit
955 * is changed from its default value, either by requesting it
956 * (slim == 0) or by setting it to the current default. At least
957 * that's how rlogind does it. If you're confused you're not alone.
958 * Bug or feature? AIX 4.3.1.2
960 if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu"))
961 && hlim == 0 && slim != 0)
962 rlim.rlim_max = rlim.rlim_cur;
963 /* A specified hard limit limits the soft limit */
964 else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max)
965 rlim.rlim_cur = rlim.rlim_max;
966 /* A soft limit can increase a hard limit */
967 else if (rlim.rlim_cur > rlim.rlim_max)
968 rlim.rlim_max = rlim.rlim_cur;
970 if (setrlimit(resource, &rlim) != 0)
971 error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno));
974 void set_limits_from_userattr(char *user)
979 set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512);
980 set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1);
981 set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512);
982 set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512);
983 set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512);
984 set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512);
985 #if defined(S_UNOFILE)
986 set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1);
989 if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) {
990 /* Convert decimal to octal */
991 (void) snprintf(buf, sizeof(buf), "%d", mask);
992 if (sscanf(buf, "%o", &mask) == 1)
996 #endif /* defined(HAVE_GETUSERATTR) */
999 * Performs common processing for the child, such as setting up the
1000 * environment, closing extra file descriptors, setting the user and group
1001 * ids, and executing the command or shell.
1004 do_child(const char *command, struct passwd * pw, const char *term,
1005 const char *display, const char *auth_proto,
1006 const char *auth_data, const char *ttyname)
1008 const char *shell, *hostname = NULL, *cp = NULL;
1014 extern char **environ;
1017 #ifdef WITH_IRIX_PROJECT
1019 #endif /* WITH_IRIX_PROJECT */
1020 #ifdef WITH_IRIX_JOBS
1023 #ifdef WITH_IRIX_ARRAY
1025 #endif /* WITH_IRIX_ARRAY */
1026 #endif /* WITH_IRIX_JOBS */
1029 /* login(1) is only called if we execute the login shell */
1030 if (options.use_login && command != NULL)
1031 options.use_login = 0;
1033 #ifndef USE_PAM /* pam_nologin handles this */
1034 if (!options.use_login) {
1035 # ifdef HAVE_LOGIN_CAP
1036 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1037 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1038 _PATH_NOLOGIN), "r");
1039 # else /* HAVE_LOGIN_CAP */
1041 f = fopen(_PATH_NOLOGIN, "r");
1042 # endif /* HAVE_LOGIN_CAP */
1044 /* /etc/nologin exists. Print its contents and exit. */
1045 while (fgets(buf, sizeof(buf), f))
1051 #endif /* USE_PAM */
1053 /* Set login name, uid, gid, and groups. */
1054 /* Login(1) does this as well, and it needs uid 0 for the "-h"
1055 switch, so we let login(1) to this for us. */
1056 if (!options.use_login) {
1058 extern char **saved_argv;
1059 extern int saved_argc;
1060 char *host = get_canonical_hostname ();
1062 if (sia_become_user(NULL, saved_argc, saved_argv, host,
1063 pw->pw_name, ttyname, 0, NULL, NULL, SIA_BEU_SETLUID) !=
1065 perror("sia_become_user");
1068 if (setreuid(geteuid(), geteuid()) < 0) {
1072 #else /* HAVE_OSF_SIA */
1076 if (getuid() == 0 || geteuid() == 0) {
1078 # ifdef HAVE_GETUSERATTR
1079 set_limits_from_userattr(pw->pw_name);
1080 # endif /* HAVE_GETUSERATTR */
1081 # ifdef HAVE_LOGIN_CAP
1082 if (setusercontext(lc, pw, pw->pw_uid,
1083 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1084 perror("unable to set user context");
1087 # else /* HAVE_LOGIN_CAP */
1088 if (setlogin(pw->pw_name) < 0)
1089 error("setlogin failed: %s", strerror(errno));
1090 if (setgid(pw->pw_gid) < 0) {
1094 /* Initialize the group list. */
1095 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1096 perror("initgroups");
1100 # ifdef WITH_IRIX_JOBS
1101 jid = jlimit_startjob(pw->pw_name, pw->pw_uid, "interactive");
1103 fatal("Failed to create job container: %.100s",
1106 # endif /* WITH_IRIX_JOBS */
1107 # ifdef WITH_IRIX_ARRAY
1108 /* initialize array session */
1110 if (newarraysess() != 0)
1111 fatal("Failed to set up new array session: %.100s",
1114 # endif /* WITH_IRIX_ARRAY */
1115 # ifdef WITH_IRIX_PROJECT
1116 /* initialize irix project info */
1117 if ((projid = getdfltprojuser(pw->pw_name)) == -1) {
1118 debug("Failed to get project id, using projid 0");
1121 if (setprid(projid))
1122 fatal("Failed to initialize project %d for %s: %.100s",
1123 (int)projid, pw->pw_name, strerror(errno));
1124 # endif /* WITH_IRIX_PROJECT */
1125 #ifdef WITH_IRIX_AUDIT
1126 if (sysconf(_SC_AUDIT)) {
1127 debug("Setting sat id to %d", (int) pw->pw_uid);
1128 if (satsetid(pw->pw_uid))
1129 debug("error setting satid: %.100s", strerror(errno));
1131 #endif /* WITH_IRIX_AUDIT */
1133 /* Permanently switch to the desired uid. */
1134 permanently_set_uid(pw->pw_uid);
1135 # endif /* HAVE_LOGIN_CAP */
1137 #endif /* HAVE_OSF_SIA */
1142 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1143 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1146 * Get the shell from the password data. An empty shell field is
1147 * legal, and means /bin/sh.
1149 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1150 #ifdef HAVE_LOGIN_CAP
1151 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1155 /* Try to get AFS tokens for the local cell. */
1159 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1160 krb_afslog(cell, 0);
1166 /* Initialize the environment. */
1168 env = xmalloc(envsize * sizeof(char *));
1173 * The Windows environment contains some setting which are
1174 * important for a running system. They must not be dropped.
1176 copy_environment(&env, &envsize);
1179 if (!options.use_login) {
1180 /* Set basic environment. */
1181 child_set_env(&env, &envsize, "USER", pw->pw_name);
1182 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
1183 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
1184 #ifdef HAVE_LOGIN_CAP
1185 (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH);
1186 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1187 #else /* HAVE_LOGIN_CAP */
1188 # ifndef HAVE_CYGWIN
1190 * There's no standard path on Windows. The path contains
1191 * important components pointing to the system directories,
1192 * needed for loading shared libraries. So the path better
1193 * remains intact here.
1195 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1196 # endif /* HAVE_CYGWIN */
1197 #endif /* HAVE_LOGIN_CAP */
1199 snprintf(buf, sizeof buf, "%.200s/%.50s",
1200 _PATH_MAILDIR, pw->pw_name);
1201 child_set_env(&env, &envsize, "MAIL", buf);
1203 /* Normal systems set SHELL by default. */
1204 child_set_env(&env, &envsize, "SHELL", shell);
1207 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1209 /* Set custom environment options from RSA authentication. */
1210 while (custom_environment) {
1211 struct envstring *ce = custom_environment;
1214 for (i = 0; s[i] != '=' && s[i]; i++);
1217 child_set_env(&env, &envsize, s, s + i + 1);
1219 custom_environment = ce->next;
1224 snprintf(buf, sizeof buf, "%.50s %d %d",
1225 get_remote_ipaddr(), get_remote_port(), get_local_port());
1226 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1229 child_set_env(&env, &envsize, "SSH_TTY", ttyname);
1231 child_set_env(&env, &envsize, "TERM", term);
1233 child_set_env(&env, &envsize, "DISPLAY", display);
1234 if (original_command)
1235 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1239 if ((cp = getenv("AUTHSTATE")) != NULL)
1240 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1241 if ((cp = getenv("KRB5CCNAME")) != NULL)
1242 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1243 read_environment_file(&env, &envsize, "/etc/environment");
1248 extern char *ticket;
1251 child_set_env(&env, &envsize, "KRBTKFILE", ticket);
1256 /* Pull in any environment variables that may have been set by PAM. */
1257 do_pam_environment(&env, &envsize);
1258 #endif /* USE_PAM */
1261 child_set_env(&env, &envsize, "XAUTHORITY", xauthfile);
1262 if (auth_get_socket_name() != NULL)
1263 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1264 auth_get_socket_name());
1266 /* read $HOME/.ssh/environment. */
1267 if (!options.use_login) {
1268 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1270 read_environment_file(&env, &envsize, buf);
1273 /* dump the environment */
1274 fprintf(stderr, "Environment:\n");
1275 for (i = 0; env[i]; i++)
1276 fprintf(stderr, " %.200s\n", env[i]);
1278 /* we have to stash the hostname before we close our socket. */
1279 if (options.use_login)
1280 hostname = get_remote_name_or_ip();
1282 * Close the connection descriptors; note that this is the child, and
1283 * the server will still have the socket open, and it is important
1284 * that we do not shutdown it. Note that the descriptors cannot be
1285 * closed before building the environment, as we call
1286 * get_remote_ipaddr there.
1288 if (packet_get_connection_in() == packet_get_connection_out())
1289 close(packet_get_connection_in());
1291 close(packet_get_connection_in());
1292 close(packet_get_connection_out());
1295 * Close all descriptors related to channels. They will still remain
1296 * open in the parent.
1298 /* XXX better use close-on-exec? -markus */
1299 channel_close_all();
1302 * Close any extra file descriptors. Note that there may still be
1303 * descriptors left by system functions. They will be closed later.
1308 * Close any extra open file descriptors so that we don\'t have them
1309 * hanging around in clients. Note that we want to do this after
1310 * initgroups, because at least on Solaris 2.3 it leaves file
1313 for (i = 3; i < 64; i++)
1316 /* Change current directory to the user\'s home directory. */
1317 if (chdir(pw->pw_dir) < 0) {
1318 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1319 pw->pw_dir, strerror(errno));
1320 #ifdef HAVE_LOGIN_CAP
1321 if (login_getcapbool(lc, "requirehome", 0))
1327 * Must take new environment into use so that .ssh/rc, /etc/sshrc and
1328 * xauth are run in the proper environment.
1333 * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first
1336 if (!options.use_login) {
1337 if (stat(SSH_USER_RC, &st) >= 0) {
1339 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, SSH_USER_RC);
1341 f = popen(_PATH_BSHELL " " SSH_USER_RC, "w");
1343 if (auth_proto != NULL && auth_data != NULL)
1344 fprintf(f, "%s %s\n", auth_proto, auth_data);
1347 fprintf(stderr, "Could not run %s\n", SSH_USER_RC);
1348 } else if (stat(SSH_SYSTEM_RC, &st) >= 0) {
1350 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, SSH_SYSTEM_RC);
1352 f = popen(_PATH_BSHELL " " SSH_SYSTEM_RC, "w");
1354 if (auth_proto != NULL && auth_data != NULL)
1355 fprintf(f, "%s %s\n", auth_proto, auth_data);
1358 fprintf(stderr, "Could not run %s\n", SSH_SYSTEM_RC);
1359 } else if (options.xauth_location != NULL) {
1360 /* Add authority data to .Xauthority if appropriate. */
1361 if (auth_proto != NULL && auth_data != NULL) {
1362 char *screen = strchr(display, ':');
1365 "Running %.100s add %.100s %.100s %.100s\n",
1366 options.xauth_location, display,
1367 auth_proto, auth_data);
1368 #ifndef HAVE_CYGWIN /* Unix sockets are not supported */
1371 "Adding %.*s/unix%s %s %s\n",
1372 (int)(screen-display), display,
1373 screen, auth_proto, auth_data);
1376 snprintf(cmd, sizeof cmd, "%s -q -",
1377 options.xauth_location);
1378 f = popen(cmd, "w");
1380 fprintf(f, "add %s %s %s\n", display,
1381 auth_proto, auth_data);
1382 #ifndef HAVE_CYGWIN /* Unix sockets are not supported */
1384 fprintf(f, "add %.*s/unix%s %s %s\n",
1385 (int)(screen-display), display,
1386 screen, auth_proto, auth_data);
1390 fprintf(stderr, "Could not run %s\n",
1395 /* Get the last component of the shell name. */
1396 cp = strrchr(shell, '/');
1403 * If we have no command, execute the shell. In this case, the shell
1404 * name to be passed in argv[0] is preceded by '-' to indicate that
1405 * this is a login shell.
1408 if (!options.use_login) {
1412 * Check for mail if we have a tty and it was enabled
1413 * in server options.
1415 if (ttyname && options.check_mail) {
1417 struct stat mailstat;
1418 mailbox = getenv("MAIL");
1419 if (mailbox != NULL) {
1420 if (stat(mailbox, &mailstat) != 0 ||
1421 mailstat.st_size == 0)
1422 printf("No mail.\n");
1423 else if (mailstat.st_mtime < mailstat.st_atime)
1424 printf("You have mail.\n");
1426 printf("You have new mail.\n");
1429 /* Start the shell. Set initial character to '-'. */
1431 strncpy(buf + 1, cp, sizeof(buf) - 1);
1432 buf[sizeof(buf) - 1] = 0;
1434 /* Execute the shell. */
1437 execve(shell, argv, env);
1439 /* Executing the shell failed. */
1444 /* Launch login(1). */
1446 execl(LOGIN_PROGRAM, "login", "-h", hostname,
1447 "-p", "-f", "--", pw->pw_name, NULL);
1449 /* Login couldn't be executed, die. */
1456 * Execute the command using the user's shell. This uses the -c
1457 * option to execute the command.
1459 argv[0] = (char *) cp;
1461 argv[2] = (char *) command;
1463 execve(shell, argv, env);
1472 static int did_init = 0;
1474 debug("session_new: init");
1475 for(i = 0; i < MAX_SESSIONS; i++) {
1476 sessions[i].used = 0;
1477 sessions[i].self = i;
1481 for(i = 0; i < MAX_SESSIONS; i++) {
1482 Session *s = &sessions[i];
1493 s->auth_data = NULL;
1494 s->auth_proto = NULL;
1497 debug("session_new: session %d", i);
1508 for(i = 0; i < MAX_SESSIONS; i++) {
1509 Session *s = &sessions[i];
1510 debug("dump: used %d session %d %p channel %d pid %d",
1520 session_open(int chanid)
1522 Session *s = session_new();
1523 debug("session_open: channel %d", chanid);
1525 error("no more sessions");
1528 s->pw = auth_get_user();
1530 fatal("no user for session %i", s->self);
1531 debug("session_open: session %d: link with channel %d", s->self, chanid);
1537 session_by_channel(int id)
1540 for(i = 0; i < MAX_SESSIONS; i++) {
1541 Session *s = &sessions[i];
1542 if (s->used && s->chanid == id) {
1543 debug("session_by_channel: session %d channel %d", i, id);
1547 debug("session_by_channel: unknown channel %d", id);
1553 session_by_pid(pid_t pid)
1556 debug("session_by_pid: pid %d", pid);
1557 for(i = 0; i < MAX_SESSIONS; i++) {
1558 Session *s = &sessions[i];
1559 if (s->used && s->pid == pid)
1562 error("session_by_pid: unknown pid %d", pid);
1568 session_window_change_req(Session *s)
1570 s->col = packet_get_int();
1571 s->row = packet_get_int();
1572 s->xpixel = packet_get_int();
1573 s->ypixel = packet_get_int();
1575 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1580 session_pty_req(Session *s)
1583 char *term_modes; /* encoded terminal modes */
1589 s->term = packet_get_string(&len);
1590 s->col = packet_get_int();
1591 s->row = packet_get_int();
1592 s->xpixel = packet_get_int();
1593 s->ypixel = packet_get_int();
1594 term_modes = packet_get_string(&len);
1597 if (strcmp(s->term, "") == 0) {
1601 /* Allocate a pty and open it. */
1602 if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) {
1607 error("session_pty_req: session %d alloc failed", s->self);
1611 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1613 * Add a cleanup function to clear the utmp entry and record logout
1614 * time in case we call fatal() (e.g., the connection gets closed).
1616 fatal_add_cleanup(pty_cleanup_proc, (void *)s);
1617 pty_setowner(s->pw, s->tty);
1618 /* Get window size from the packet. */
1619 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1621 session_proctitle(s);
1623 /* XXX parse and set terminal modes */
1629 session_subsystem_req(Session *s)
1633 char *subsys = packet_get_string(&len);
1637 log("subsystem request for %s", subsys);
1639 for (i = 0; i < options.num_subsystems; i++) {
1640 if(strcmp(subsys, options.subsystem_name[i]) == 0) {
1641 debug("subsystem: exec() %s", options.subsystem_command[i]);
1642 do_exec_no_pty(s, options.subsystem_command[i], s->pw);
1648 log("subsystem request for %s failed, subsystem not found", subsys);
1655 session_x11_req(Session *s)
1658 if (no_x11_forwarding_flag) {
1659 debug("X11 forwarding disabled in user configuration file.");
1662 if (!options.x11_forwarding) {
1663 debug("X11 forwarding disabled in server configuration file.");
1666 if (xauthfile != NULL) {
1667 debug("X11 fwd already started.");
1671 debug("Received request for X11 forwarding with auth spoofing.");
1672 if (s->display != NULL)
1673 packet_disconnect("Protocol error: X11 display already set.");
1675 s->single_connection = packet_get_char();
1676 s->auth_proto = packet_get_string(NULL);
1677 s->auth_data = packet_get_string(NULL);
1678 s->screen = packet_get_int();
1681 s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
1682 if (s->display == NULL) {
1683 xfree(s->auth_proto);
1684 xfree(s->auth_data);
1687 xauthfile = xmalloc(MAXPATHLEN);
1688 strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
1689 temporarily_use_uid(s->pw->pw_uid);
1690 if (mkdtemp(xauthfile) == NULL) {
1692 error("private X11 dir: mkdtemp %s failed: %s",
1693 xauthfile, strerror(errno));
1696 xfree(s->auth_proto);
1697 xfree(s->auth_data);
1698 /* XXXX remove listening channels */
1701 strlcat(xauthfile, "/cookies", MAXPATHLEN);
1702 fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
1706 fatal_add_cleanup(xauthfile_cleanup_proc, s);
1711 session_shell_req(Session *s)
1713 /* if forced_command == NULL, the shell is execed */
1714 char *shell = forced_command;
1718 do_exec_no_pty(s, shell, s->pw);
1720 do_exec_pty(s, shell, s->pw);
1725 session_exec_req(Session *s)
1728 char *command = packet_get_string(&len);
1730 if (forced_command) {
1731 original_command = command;
1732 command = forced_command;
1733 debug("Forced command '%.500s'", forced_command);
1737 do_exec_no_pty(s, command, s->pw);
1739 do_exec_pty(s, command, s->pw);
1740 if (forced_command == NULL)
1746 session_auth_agent_req(Session *s)
1748 static int called = 0;
1750 if (no_agent_forwarding_flag) {
1751 debug("session_auth_agent_req: no_agent_forwarding_flag");
1758 return auth_input_request_forwarding(s->pw);
1763 session_input_channel_req(int id, void *arg)
1772 rtype = packet_get_string(&len);
1773 reply = packet_get_char();
1775 s = session_by_channel(id);
1777 fatal("session_input_channel_req: channel %d: no session", id);
1778 c = channel_lookup(id);
1780 fatal("session_input_channel_req: channel %d: bad channel", id);
1782 debug("session_input_channel_req: session %d channel %d request %s reply %d",
1783 s->self, id, rtype, reply);
1786 * a session is in LARVAL state until a shell
1787 * or programm is executed
1789 if (c->type == SSH_CHANNEL_LARVAL) {
1790 if (strcmp(rtype, "shell") == 0) {
1791 success = session_shell_req(s);
1792 } else if (strcmp(rtype, "exec") == 0) {
1793 success = session_exec_req(s);
1794 } else if (strcmp(rtype, "pty-req") == 0) {
1795 success = session_pty_req(s);
1796 } else if (strcmp(rtype, "x11-req") == 0) {
1797 success = session_x11_req(s);
1798 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1799 success = session_auth_agent_req(s);
1800 } else if (strcmp(rtype, "subsystem") == 0) {
1801 success = session_subsystem_req(s);
1804 if (strcmp(rtype, "window-change") == 0) {
1805 success = session_window_change_req(s);
1809 packet_start(success ?
1810 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1811 packet_put_int(c->remote_id);
1818 session_set_fds(Session *s, int fdin, int fdout, int fderr)
1821 fatal("session_set_fds: called for proto != 2.0");
1823 * now that have a child and a pipe to the child,
1824 * we can activate our channel and register the fd's
1826 if (s->chanid == -1)
1827 fatal("no channel for session %d", s->self);
1828 channel_set_fds(s->chanid,
1830 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1835 session_pty_cleanup(Session *s)
1837 if (s == NULL || s->ttyfd == -1)
1840 debug("session_pty_cleanup: session %i release %s", s->self, s->tty);
1842 /* Cancel the cleanup function. */
1843 fatal_remove_cleanup(pty_cleanup_proc, (void *)s);
1845 /* Record that the user has logged out. */
1846 record_logout(s->pid, s->tty);
1848 /* Release the pseudo-tty. */
1849 pty_release(s->tty);
1852 * Close the server side of the socket pairs. We must do this after
1853 * the pty cleanup, so that another process doesn't get this pty
1854 * while we're still cleaning up.
1856 if (close(s->ptymaster) < 0)
1857 error("close(s->ptymaster): %s", strerror(errno));
1861 session_exit_message(Session *s, int status)
1865 fatal("session_close: no session");
1866 c = channel_lookup(s->chanid);
1868 fatal("session_close: session %d: no channel %d",
1869 s->self, s->chanid);
1870 debug("session_exit_message: session %d channel %d pid %d",
1871 s->self, s->chanid, s->pid);
1873 if (WIFEXITED(status)) {
1874 channel_request_start(s->chanid,
1876 packet_put_int(WEXITSTATUS(status));
1878 } else if (WIFSIGNALED(status)) {
1879 channel_request_start(s->chanid,
1881 packet_put_int(WTERMSIG(status));
1883 packet_put_char(WCOREDUMP(status));
1884 #else /* WCOREDUMP */
1886 #endif /* WCOREDUMP */
1887 packet_put_cstring("");
1888 packet_put_cstring("");
1891 /* Some weird exit cause. Just exit. */
1892 packet_disconnect("wait returned status %04x.", status);
1895 /* disconnect channel */
1896 debug("session_exit_message: release channel %d", s->chanid);
1897 channel_cancel_cleanup(s->chanid);
1899 * emulate a write failure with 'chan_write_failed', nobody will be
1900 * interested in data we write.
1901 * Note that we must not call 'chan_read_failed', since there could
1902 * be some more data waiting in the pipe.
1904 if (c->ostate != CHAN_OUTPUT_CLOSED)
1905 chan_write_failed(c);
1910 session_free(Session *s)
1912 debug("session_free: session %d pid %d", s->self, s->pid);
1918 xfree(s->auth_data);
1920 xfree(s->auth_proto);
1925 session_close(Session *s)
1927 session_pty_cleanup(s);
1929 session_proctitle(s);
1933 session_close_by_pid(pid_t pid, int status)
1935 Session *s = session_by_pid(pid);
1937 debug("session_close_by_pid: no session for pid %d", s->pid);
1940 if (s->chanid != -1)
1941 session_exit_message(s, status);
1946 * this is called when a channel dies before
1947 * the session 'child' itself dies
1950 session_close_by_channel(int id, void *arg)
1952 Session *s = session_by_channel(id);
1954 debug("session_close_by_channel: no session for channel %d", id);
1957 /* disconnect channel */
1958 channel_cancel_cleanup(s->chanid);
1961 debug("session_close_by_channel: channel %d kill %d", id, s->pid);
1963 /* close session immediately */
1966 /* notify child, delay session cleanup */
1968 fatal("session_close_by_channel: Unsafe s->pid = %d", s->pid);
1969 if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0)
1970 error("session_close_by_channel: kill %d: %s",
1971 s->pid, strerror(errno));
1976 session_tty_list(void)
1978 static char buf[1024];
1981 for(i = 0; i < MAX_SESSIONS; i++) {
1982 Session *s = &sessions[i];
1983 if (s->used && s->ttyfd != -1) {
1985 strlcat(buf, ",", sizeof buf);
1986 strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1990 strlcpy(buf, "notty", sizeof buf);
1995 session_proctitle(Session *s)
1998 error("no user for session %d", s->self);
2000 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
2004 do_authenticated2(void)
2006 #ifdef HAVE_LOGIN_CAP
2011 * Cancel the alarm we set to limit the time taken for
2015 if (startup_pipe != -1) {
2016 close(startup_pipe);
2019 #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD)
2020 pw = auth_get_user();
2021 if ((lc = login_getclass(pw->pw_class)) == NULL) {
2022 error("unable to get login class");
2028 xauthfile_cleanup_proc(NULL);