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 1.55 2001/02/08 19:30:52 itojun Exp $");
52 #include "auth-options.h"
53 #include "pathnames.h"
57 #include "serverloop.h"
61 #ifdef WITH_IRIX_PROJECT
63 #endif /* WITH_IRIX_PROJECT */
65 #include <sys/resource.h>
67 #ifdef WITH_IRIX_AUDIT
69 #endif /* WITH_IRIX_AUDIT */
71 #if defined(HAVE_USERSEC_H)
77 #include <sys/cygwin.h>
78 #define is_winnt (GetVersion() < 0x80000000)
82 #if defined(HAVE_GETUSERATTR) && !defined(S_UFSIZE_HARD) && defined(S_UFSIZE)
83 # define S_UFSIZE_HARD S_UFSIZE "_hard"
84 # define S_UCPU_HARD S_UCPU "_hard"
85 # define S_UDATA_HARD S_UDATA "_hard"
86 # define S_USTACK_HARD S_USTACK "_hard"
87 # define S_URSS_HARD S_URSS "_hard"
88 # define S_UCORE_HARD S_UCORE "_hard"
89 # define S_UNOFILE_HARD S_UNOFILE "_hard"
93 #include <login_cap.h>
99 typedef struct Session Session;
108 int ptyfd, ttyfd, ptymaster;
109 int row, col, xpixel, ypixel;
116 int single_connection;
123 Session *session_new(void);
124 void session_set_fds(Session *s, int fdin, int fdout, int fderr);
125 void session_pty_cleanup(Session *s);
126 void session_proctitle(Session *s);
127 void do_exec_pty(Session *s, const char *command, struct passwd * pw);
128 void do_exec_no_pty(Session *s, const char *command, struct passwd * pw);
129 void do_login(Session *s, const char *command);
132 do_child(const char *command, struct passwd * pw, const char *term,
133 const char *display, const char *auth_proto,
134 const char *auth_data, const char *ttyname);
137 extern ServerOptions options;
138 extern char *__progname;
139 extern int log_stderr;
140 extern int debug_flag;
141 extern u_int utmp_len;
143 extern int startup_pipe;
145 /* Local Xauthority file. */
146 static char *xauthfile;
148 /* original command from peer. */
149 char *original_command = NULL;
152 #define MAX_SESSIONS 10
153 Session sessions[MAX_SESSIONS];
155 #ifdef WITH_AIXAUTHENTICATE
156 /* AIX's lastlogin message, set in auth1.c */
158 #endif /* WITH_AIXAUTHENTICATE */
160 #ifdef HAVE_LOGIN_CAP
161 static login_cap_t *lc;
165 * Remove local Xauthority file.
168 xauthfile_cleanup_proc(void *ignore)
170 debug("xauthfile_cleanup_proc called");
172 if (xauthfile != NULL) {
175 p = strrchr(xauthfile, '/');
186 * Function to perform cleanup if we get aborted abnormally (e.g., due to a
187 * dropped connection).
190 pty_cleanup_proc(void *session)
194 fatal("pty_cleanup_proc: no session");
195 debug("pty_cleanup_proc: %s", s->tty);
198 /* Record that the user has logged out. */
199 record_logout(s->pid, s->tty);
202 /* Release the pseudo-tty. */
207 * Prepares for an interactive session. This is called after the user has
208 * been successfully authenticated. During this message exchange, pseudo
209 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
210 * are requested, etc.
213 do_authenticated(struct passwd * pw)
217 int compression_level = 0, enable_compression_after_reply = 0;
222 u_int proto_len, data_len, dlen;
225 * Cancel the alarm we set to limit the time taken for
229 if (startup_pipe != -1) {
235 * Inform the channel mechanism that we are the server side and that
236 * the client may request to connect to any port at all. (The user
237 * could do it anyway, and we wouldn\'t know what is permitted except
238 * by the client telling us, so we can equally well trust the client
239 * not to request anything bogus.)
241 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
242 channel_permit_all_opens();
247 #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD)
248 if ((lc = login_getclass(pw->pw_class)) == NULL) {
249 error("unable to get login class");
255 * We stay in this loop until the client requests to execute a shell
261 /* Get a packet from the client. */
262 type = packet_read(&plen);
264 /* Process the packet. */
266 case SSH_CMSG_REQUEST_COMPRESSION:
267 packet_integrity_check(plen, 4, type);
268 compression_level = packet_get_int();
269 if (compression_level < 1 || compression_level > 9) {
270 packet_send_debug("Received illegal compression level %d.",
274 /* Enable compression after we have responded with SUCCESS. */
275 enable_compression_after_reply = 1;
279 case SSH_CMSG_REQUEST_PTY:
281 debug("Allocating a pty not permitted for this authentication.");
285 packet_disconnect("Protocol error: you already have a pty.");
287 debug("Allocating pty.");
289 /* Allocate a pty and open it. */
290 if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty,
292 error("Failed to allocate pty.");
295 fatal_add_cleanup(pty_cleanup_proc, (void *)s);
296 pty_setowner(pw, s->tty);
298 /* Get TERM from the packet. Note that the value may be of arbitrary length. */
299 s->term = packet_get_string(&dlen);
300 packet_integrity_check(dlen, strlen(s->term), type);
301 /* packet_integrity_check(plen, 4 + dlen + 4*4 + n_bytes, type); */
302 /* Remaining bytes */
303 n_bytes = plen - (4 + dlen + 4 * 4);
305 if (strcmp(s->term, "") == 0) {
309 /* Get window size from the packet. */
310 s->row = packet_get_int();
311 s->col = packet_get_int();
312 s->xpixel = packet_get_int();
313 s->ypixel = packet_get_int();
314 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
316 /* Get tty modes from the packet. */
317 tty_parse_modes(s->ttyfd, &n_bytes);
318 packet_integrity_check(plen, 4 + dlen + 4 * 4 + n_bytes, type);
320 session_proctitle(s);
322 /* Indicate that we now have a pty. */
327 case SSH_CMSG_X11_REQUEST_FORWARDING:
328 if (!options.x11_forwarding) {
329 packet_send_debug("X11 forwarding disabled in server configuration file.");
332 if (!options.xauth_location) {
333 packet_send_debug("No xauth program; cannot forward with spoofing.");
336 if (no_x11_forwarding_flag) {
337 packet_send_debug("X11 forwarding not permitted for this authentication.");
340 debug("Received request for X11 forwarding with auth spoofing.");
341 if (s->display != NULL)
342 packet_disconnect("Protocol error: X11 display already set.");
344 s->auth_proto = packet_get_string(&proto_len);
345 s->auth_data = packet_get_string(&data_len);
346 packet_integrity_check(plen, 4 + proto_len + 4 + data_len + 4, type);
348 if (packet_get_protocol_flags() & SSH_PROTOFLAG_SCREEN_NUMBER)
349 s->screen = packet_get_int();
352 s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
354 if (s->display == NULL)
357 /* Setup to always have a local .Xauthority. */
358 xauthfile = xmalloc(MAXPATHLEN);
359 strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
360 temporarily_use_uid(pw->pw_uid);
361 if (mkdtemp(xauthfile) == NULL) {
363 error("private X11 dir: mkdtemp %s failed: %s",
364 xauthfile, strerror(errno));
367 /* XXXX remove listening channels */
370 strlcat(xauthfile, "/cookies", MAXPATHLEN);
371 fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
375 fatal_add_cleanup(xauthfile_cleanup_proc, NULL);
379 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
380 if (no_agent_forwarding_flag || compat13) {
381 debug("Authentication agent forwarding not permitted for this authentication.");
384 debug("Received authentication agent forwarding request.");
385 success = auth_input_request_forwarding(pw);
388 case SSH_CMSG_PORT_FORWARD_REQUEST:
389 if (no_port_forwarding_flag) {
390 debug("Port forwarding not permitted for this authentication.");
393 if (!options.allow_tcp_forwarding) {
394 debug("Port forwarding not permitted.");
397 debug("Received TCP/IP port forwarding request.");
398 channel_input_port_forward_request(pw->pw_uid == 0, options.gateway_ports);
402 case SSH_CMSG_MAX_PACKET_SIZE:
403 if (packet_set_maxsize(packet_get_int()) > 0)
407 case SSH_CMSG_EXEC_SHELL:
408 case SSH_CMSG_EXEC_CMD:
409 if (type == SSH_CMSG_EXEC_CMD) {
410 command = packet_get_string(&dlen);
411 debug("Exec command '%.500s'", command);
412 packet_integrity_check(plen, 4 + dlen, type);
415 packet_integrity_check(plen, 0, type);
417 if (forced_command != NULL) {
418 original_command = command;
419 command = forced_command;
420 debug("Forced command '%.500s'", forced_command);
423 do_exec_pty(s, command, pw);
425 do_exec_no_pty(s, command, pw);
429 /* Cleanup user's local Xauthority file. */
431 xauthfile_cleanup_proc(NULL);
436 * Any unknown messages in this phase are ignored,
437 * and a failure message is returned.
439 log("Unknown packet type received after authentication: %d", type);
441 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
445 /* Enable compression now that we have replied if appropriate. */
446 if (enable_compression_after_reply) {
447 enable_compression_after_reply = 0;
448 packet_start_compression(compression_level);
454 * This is called to fork and execute a command when we have no tty. This
455 * will call do_child from the child, and server_loop from the parent after
456 * setting up file descriptors and such.
459 do_exec_no_pty(Session *s, const char *command, struct passwd * pw)
464 int pin[2], pout[2], perr[2];
465 /* Allocate pipes for communicating with the program. */
466 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
467 packet_disconnect("Could not create pipes: %.100s",
469 #else /* USE_PIPES */
470 int inout[2], err[2];
471 /* Uses socket pairs to communicate with the program. */
472 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
473 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
474 packet_disconnect("Could not create socket pairs: %.100s",
476 #endif /* USE_PIPES */
478 fatal("do_exec_no_pty: no session");
480 session_proctitle(s);
482 /* Fork the child. */
483 if ((pid = fork()) == 0) {
484 /* Child. Reinitialize the log since the pid has changed. */
485 log_init(__progname, options.log_level, options.log_facility, log_stderr);
487 signal(SIGPIPE, SIG_DFL);
490 * Create a new session and process group since the 4.4BSD
491 * setlogin() affects the entire process group.
494 error("setsid failed: %.100s", strerror(errno));
498 * Redirect stdin. We close the parent side of the socket
499 * pair, and make the child side the standard input.
502 if (dup2(pin[0], 0) < 0)
503 perror("dup2 stdin");
506 /* Redirect stdout. */
508 if (dup2(pout[1], 1) < 0)
509 perror("dup2 stdout");
512 /* Redirect stderr. */
514 if (dup2(perr[1], 2) < 0)
515 perror("dup2 stderr");
517 #else /* USE_PIPES */
519 * Redirect stdin, stdout, and stderr. Stdin and stdout will
520 * use the same socket, as some programs (particularly rdist)
521 * seem to depend on it.
525 if (dup2(inout[0], 0) < 0) /* stdin */
526 perror("dup2 stdin");
527 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
528 perror("dup2 stdout");
529 if (dup2(err[0], 2) < 0) /* stderr */
530 perror("dup2 stderr");
531 #endif /* USE_PIPES */
533 /* Do processing for the child (exec command etc). */
534 do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL);
539 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
542 packet_disconnect("fork failed: %.100s", strerror(errno));
544 /* Set interactive/non-interactive mode. */
545 packet_set_interactive(s->display != NULL);
547 /* We are the parent. Close the child sides of the pipes. */
553 session_set_fds(s, pin[1], pout[0], s->extended ? perr[0] : -1);
555 /* Enter the interactive session. */
556 server_loop(pid, pin[1], pout[0], perr[0]);
557 /* server_loop has closed pin[1], pout[1], and perr[1]. */
559 #else /* USE_PIPES */
560 /* We are the parent. Close the child sides of the socket pairs. */
565 * Enter the interactive session. Note: server_loop must be able to
566 * handle the case that fdin and fdout are the same.
569 session_set_fds(s, inout[1], inout[1], s->extended ? err[1] : -1);
571 server_loop(pid, inout[1], inout[1], err[1]);
572 /* server_loop has closed inout[1] and err[1]. */
574 #endif /* USE_PIPES */
578 * This is called to fork and execute a command when we have a tty. This
579 * will call do_child from the child, and server_loop from the parent after
580 * setting up file descriptors, controlling tty, updating wtmp, utmp,
581 * lastlog, and other such operations.
584 do_exec_pty(Session *s, const char *command, struct passwd * pw)
586 int fdout, ptyfd, ttyfd, ptymaster;
590 fatal("do_exec_pty: no session");
594 /* Fork the child. */
595 if ((pid = fork()) == 0) {
596 /* Child. Reinitialize the log because the pid has changed. */
597 log_init(__progname, options.log_level, options.log_facility, log_stderr);
599 signal(SIGPIPE, SIG_DFL);
601 /* Close the master side of the pseudo tty. */
604 /* Make the pseudo tty our controlling tty. */
605 pty_make_controlling_tty(&ttyfd, s->tty);
607 /* Redirect stdin from the pseudo tty. */
608 if (dup2(ttyfd, fileno(stdin)) < 0)
609 error("dup2 stdin failed: %.100s", strerror(errno));
611 /* Redirect stdout to the pseudo tty. */
612 if (dup2(ttyfd, fileno(stdout)) < 0)
613 error("dup2 stdin failed: %.100s", strerror(errno));
615 /* Redirect stderr to the pseudo tty. */
616 if (dup2(ttyfd, fileno(stderr)) < 0)
617 error("dup2 stdin failed: %.100s", strerror(errno));
619 /* Close the extra descriptor for the pseudo tty. */
622 /* record login, etc. similar to login(1) */
623 if (!(options.use_login && command == NULL))
624 do_login(s, command);
626 /* Do common processing for the child, such as execing the command. */
627 do_child(command, pw, s->term, s->display, s->auth_proto,
628 s->auth_data, s->tty);
633 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
636 packet_disconnect("fork failed: %.100s", strerror(errno));
639 /* Parent. Close the slave side of the pseudo tty. */
643 * Create another descriptor of the pty master side for use as the
644 * standard input. We could use the original descriptor, but this
645 * simplifies code in server_loop. The descriptor is bidirectional.
649 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
651 /* we keep a reference to the pty master */
652 ptymaster = dup(ptyfd);
654 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
655 s->ptymaster = ptymaster;
657 /* Enter interactive session. */
658 packet_set_interactive(1);
660 session_set_fds(s, ptyfd, fdout, -1);
662 server_loop(pid, ptyfd, fdout, -1);
663 /* server_loop _has_ closed ptyfd and fdout. */
664 session_pty_cleanup(s);
669 get_remote_name_or_ip(void)
671 static const char *remote = "";
673 remote = get_canonical_hostname(options.reverse_mapping_check);
674 if (utmp_len == 0 || strlen(remote) > utmp_len)
675 remote = get_remote_ipaddr();
679 /* administrative, login(1)-like work */
681 do_login(Session *s, const char *command)
686 char hostname[MAXHOSTNAMELEN];
688 struct sockaddr_storage from;
690 time_t last_login_time;
691 struct passwd * pw = s->pw;
692 pid_t pid = getpid();
695 * Get IP address of client. If the connection is not a socket, let
696 * the address be 0.0.0.0.
698 memset(&from, 0, sizeof(from));
699 if (packet_connection_is_on_socket()) {
700 fromlen = sizeof(from);
701 if (getpeername(packet_get_connection_in(),
702 (struct sockaddr *) & from, &fromlen) < 0) {
703 debug("getpeername: %.100s", strerror(errno));
708 /* Get the time and hostname when the user last logged in. */
710 last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name,
711 hostname, sizeof(hostname));
713 /* Record that there was a login on that tty from the remote host. */
714 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
715 get_remote_name_or_ip(), (struct sockaddr *)&from);
719 * If password change is needed, do it now.
720 * This needs to occur before the ~/.hushlogin check.
722 if (is_pam_password_change_required()) {
723 print_pam_messages();
728 /* Done if .hushlogin exists or a command given. */
731 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
732 #ifdef HAVE_LOGIN_CAP
733 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
735 if (stat(buf, &st) >= 0)
740 if (!is_pam_password_change_required())
741 print_pam_messages();
743 #ifdef WITH_AIXAUTHENTICATE
744 if (aixloginmsg && *aixloginmsg)
745 printf("%s\n", aixloginmsg);
746 #endif /* WITH_AIXAUTHENTICATE */
748 if (last_login_time != 0) {
749 time_string = ctime(&last_login_time);
750 if (strchr(time_string, '\n'))
751 *strchr(time_string, '\n') = 0;
752 if (strcmp(hostname, "") == 0)
753 printf("Last login: %s\r\n", time_string);
755 printf("Last login: %s from %s\r\n", time_string, hostname);
757 if (options.print_motd) {
758 #ifdef HAVE_LOGIN_CAP
759 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
762 f = fopen("/etc/motd", "r");
765 while (fgets(buf, sizeof(buf), f))
773 * Sets the value of the given variable in the environment. If the variable
774 * already exists, its value is overriden.
777 child_set_env(char ***envp, u_int *envsizep, const char *name,
784 * Find the slot where the value should be stored. If the variable
785 * already exists, we reuse the slot; otherwise we append a new slot
786 * at the end of the array, expanding if necessary.
789 namelen = strlen(name);
790 for (i = 0; env[i]; i++)
791 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
794 /* Reuse the slot. */
797 /* New variable. Expand if necessary. */
798 if (i >= (*envsizep) - 1) {
800 env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
802 /* Need to set the NULL pointer at end of array beyond the new slot. */
806 /* Allocate space and format the variable in the appropriate slot. */
807 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
808 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
812 * Reads environment variables from the given file and adds/overrides them
813 * into the environment. If the file does not exist, this does nothing.
814 * Otherwise, it must consist of empty lines, comments (line starts with '#')
815 * and assignments of the form name=value. No other forms are allowed.
818 read_environment_file(char ***env, u_int *envsize,
819 const char *filename)
825 f = fopen(filename, "r");
829 while (fgets(buf, sizeof(buf), f)) {
830 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
832 if (!*cp || *cp == '#' || *cp == '\n')
834 if (strchr(cp, '\n'))
835 *strchr(cp, '\n') = '\0';
836 value = strchr(cp, '=');
838 fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf);
842 * Replace the equals sign by nul, and advance value to
847 child_set_env(env, envsize, cp, value);
854 * Sets any environment variables which have been specified by PAM
856 void do_pam_environment(char ***env, int *envsize)
858 char *equals, var_name[512], var_val[512];
862 if ((pam_env = fetch_pam_environment()) == NULL)
865 for(i = 0; pam_env[i] != NULL; i++) {
866 if ((equals = strstr(pam_env[i], "=")) == NULL)
869 if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) {
870 memset(var_name, '\0', sizeof(var_name));
871 memset(var_val, '\0', sizeof(var_val));
873 strncpy(var_name, pam_env[i], equals - pam_env[i]);
874 strcpy(var_val, equals + 1);
876 debug3("PAM environment: %s=%s", var_name, var_val);
878 child_set_env(env, envsize, var_name, var_val);
886 void copy_environment(char ***env, int *envsize)
888 char *equals, var_name[512], var_val[512];
891 for(i = 0; environ[i] != NULL; i++) {
892 if ((equals = strstr(environ[i], "=")) == NULL)
895 if (strlen(environ[i]) < (sizeof(var_name) - 1)) {
896 memset(var_name, '\0', sizeof(var_name));
897 memset(var_val, '\0', sizeof(var_val));
899 strncpy(var_name, environ[i], equals - environ[i]);
900 strcpy(var_val, equals + 1);
902 debug3("Copy environment: %s=%s", var_name, var_val);
904 child_set_env(env, envsize, var_name, var_val);
910 #if defined(HAVE_GETUSERATTR)
912 * AIX-specific login initialisation
914 void set_limit(char *user, char *soft, char *hard, int resource, int mult)
919 getrlimit(resource, &rlim);
922 if (getuserattr(user, soft, &slim, SEC_INT) != -1) {
924 rlim.rlim_cur = RLIM_INFINITY;
925 } else if (slim != 0) {
926 /* See the wackiness below */
927 if (rlim.rlim_cur == slim * mult)
930 rlim.rlim_cur = slim * mult;
935 if (getuserattr(user, hard, &hlim, SEC_INT) != -1) {
937 rlim.rlim_max = RLIM_INFINITY;
938 } else if (hlim != 0) {
939 rlim.rlim_max = hlim * mult;
944 * XXX For cpu and fsize the soft limit is set to the hard limit
945 * if the hard limit is left at its default value and the soft limit
946 * is changed from its default value, either by requesting it
947 * (slim == 0) or by setting it to the current default. At least
948 * that's how rlogind does it. If you're confused you're not alone.
949 * Bug or feature? AIX 4.3.1.2
951 if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu"))
952 && hlim == 0 && slim != 0)
953 rlim.rlim_max = rlim.rlim_cur;
954 /* A specified hard limit limits the soft limit */
955 else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max)
956 rlim.rlim_cur = rlim.rlim_max;
957 /* A soft limit can increase a hard limit */
958 else if (rlim.rlim_cur > rlim.rlim_max)
959 rlim.rlim_max = rlim.rlim_cur;
961 if (setrlimit(resource, &rlim) != 0)
962 error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno));
965 void set_limits_from_userattr(char *user)
970 set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512);
971 set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1);
972 set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512);
973 set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512);
974 set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512);
975 set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512);
976 #if defined(S_UNOFILE)
977 set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1);
980 if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) {
981 /* Convert decimal to octal */
982 (void) snprintf(buf, sizeof(buf), "%d", mask);
983 if (sscanf(buf, "%o", &mask) == 1)
987 #endif /* defined(HAVE_GETUSERATTR) */
990 * Performs common processing for the child, such as setting up the
991 * environment, closing extra file descriptors, setting the user and group
992 * ids, and executing the command or shell.
995 do_child(const char *command, struct passwd * pw, const char *term,
996 const char *display, const char *auth_proto,
997 const char *auth_data, const char *ttyname)
999 const char *shell, *hostname = NULL, *cp = NULL;
1005 extern char **environ;
1008 #ifdef WITH_IRIX_PROJECT
1010 #endif /* WITH_IRIX_PROJECT */
1011 #ifdef WITH_IRIX_JOBS
1014 #ifdef WITH_IRIX_ARRAY
1016 #endif /* WITH_IRIX_ARRAY */
1017 #endif /* WITH_IRIX_JOBS */
1020 do_pam_session(pw->pw_name, ttyname);
1022 #endif /* USE_PAM */
1024 /* login(1) is only called if we execute the login shell */
1025 if (options.use_login && command != NULL)
1026 options.use_login = 0;
1028 #ifndef USE_PAM /* pam_nologin handles this */
1029 if (!options.use_login) {
1030 # ifdef HAVE_LOGIN_CAP
1031 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1032 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1033 _PATH_NOLOGIN), "r");
1034 # else /* HAVE_LOGIN_CAP */
1036 f = fopen(_PATH_NOLOGIN, "r");
1037 # endif /* HAVE_LOGIN_CAP */
1039 /* /etc/nologin exists. Print its contents and exit. */
1040 while (fgets(buf, sizeof(buf), f))
1046 #endif /* USE_PAM */
1048 /* Set login name, uid, gid, and groups. */
1049 /* Login(1) does this as well, and it needs uid 0 for the "-h"
1050 switch, so we let login(1) to this for us. */
1051 if (!options.use_login) {
1053 session_setup_sia(pw->pw_name, ttyname);
1054 #else /* HAVE_OSF_SIA */
1058 if (getuid() == 0 || geteuid() == 0) {
1060 # ifdef HAVE_GETUSERATTR
1061 set_limits_from_userattr(pw->pw_name);
1062 # endif /* HAVE_GETUSERATTR */
1063 # ifdef HAVE_LOGIN_CAP
1064 if (setusercontext(lc, pw, pw->pw_uid,
1065 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1066 perror("unable to set user context");
1069 # else /* HAVE_LOGIN_CAP */
1070 if (setlogin(pw->pw_name) < 0)
1071 error("setlogin failed: %s", strerror(errno));
1072 if (setgid(pw->pw_gid) < 0) {
1076 /* Initialize the group list. */
1077 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1078 perror("initgroups");
1082 # ifdef WITH_IRIX_JOBS
1083 jid = jlimit_startjob(pw->pw_name, pw->pw_uid, "interactive");
1085 fatal("Failed to create job container: %.100s",
1088 # endif /* WITH_IRIX_JOBS */
1089 # ifdef WITH_IRIX_ARRAY
1090 /* initialize array session */
1092 if (newarraysess() != 0)
1093 fatal("Failed to set up new array session: %.100s",
1096 # endif /* WITH_IRIX_ARRAY */
1097 # ifdef WITH_IRIX_PROJECT
1098 /* initialize irix project info */
1099 if ((projid = getdfltprojuser(pw->pw_name)) == -1) {
1100 debug("Failed to get project id, using projid 0");
1103 if (setprid(projid))
1104 fatal("Failed to initialize project %d for %s: %.100s",
1105 (int)projid, pw->pw_name, strerror(errno));
1106 # endif /* WITH_IRIX_PROJECT */
1107 #ifdef WITH_IRIX_AUDIT
1108 if (sysconf(_SC_AUDIT)) {
1109 debug("Setting sat id to %d", (int) pw->pw_uid);
1110 if (satsetid(pw->pw_uid))
1111 debug("error setting satid: %.100s", strerror(errno));
1113 #endif /* WITH_IRIX_AUDIT */
1115 /* Permanently switch to the desired uid. */
1116 permanently_set_uid(pw->pw_uid);
1117 # endif /* HAVE_LOGIN_CAP */
1119 #endif /* HAVE_OSF_SIA */
1124 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1125 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1128 * Get the shell from the password data. An empty shell field is
1129 * legal, and means /bin/sh.
1131 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1132 #ifdef HAVE_LOGIN_CAP
1133 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1137 /* Try to get AFS tokens for the local cell. */
1141 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1142 krb_afslog(cell, 0);
1148 /* Initialize the environment. */
1150 env = xmalloc(envsize * sizeof(char *));
1155 * The Windows environment contains some setting which are
1156 * important for a running system. They must not be dropped.
1158 copy_environment(&env, &envsize);
1161 if (!options.use_login) {
1162 /* Set basic environment. */
1163 child_set_env(&env, &envsize, "USER", pw->pw_name);
1164 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
1165 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
1166 #ifdef HAVE_LOGIN_CAP
1167 (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH);
1168 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1169 #else /* HAVE_LOGIN_CAP */
1170 # ifndef HAVE_CYGWIN
1172 * There's no standard path on Windows. The path contains
1173 * important components pointing to the system directories,
1174 * needed for loading shared libraries. So the path better
1175 * remains intact here.
1177 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1178 # endif /* HAVE_CYGWIN */
1179 #endif /* HAVE_LOGIN_CAP */
1181 snprintf(buf, sizeof buf, "%.200s/%.50s",
1182 _PATH_MAILDIR, pw->pw_name);
1183 child_set_env(&env, &envsize, "MAIL", buf);
1185 /* Normal systems set SHELL by default. */
1186 child_set_env(&env, &envsize, "SHELL", shell);
1189 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1191 /* Set custom environment options from RSA authentication. */
1192 while (custom_environment) {
1193 struct envstring *ce = custom_environment;
1196 for (i = 0; s[i] != '=' && s[i]; i++);
1199 child_set_env(&env, &envsize, s, s + i + 1);
1201 custom_environment = ce->next;
1206 snprintf(buf, sizeof buf, "%.50s %d %d",
1207 get_remote_ipaddr(), get_remote_port(), get_local_port());
1208 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1211 child_set_env(&env, &envsize, "SSH_TTY", ttyname);
1213 child_set_env(&env, &envsize, "TERM", term);
1215 child_set_env(&env, &envsize, "DISPLAY", display);
1216 if (original_command)
1217 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1221 if ((cp = getenv("AUTHSTATE")) != NULL)
1222 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1223 if ((cp = getenv("KRB5CCNAME")) != NULL)
1224 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1225 read_environment_file(&env, &envsize, "/etc/environment");
1230 extern char *ticket;
1233 child_set_env(&env, &envsize, "KRBTKFILE", ticket);
1238 /* Pull in any environment variables that may have been set by PAM. */
1239 do_pam_environment(&env, &envsize);
1240 #endif /* USE_PAM */
1243 child_set_env(&env, &envsize, "XAUTHORITY", xauthfile);
1244 if (auth_get_socket_name() != NULL)
1245 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1246 auth_get_socket_name());
1248 /* read $HOME/.ssh/environment. */
1249 if (!options.use_login) {
1250 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1252 read_environment_file(&env, &envsize, buf);
1255 /* dump the environment */
1256 fprintf(stderr, "Environment:\n");
1257 for (i = 0; env[i]; i++)
1258 fprintf(stderr, " %.200s\n", env[i]);
1260 /* we have to stash the hostname before we close our socket. */
1261 if (options.use_login)
1262 hostname = get_remote_name_or_ip();
1264 * Close the connection descriptors; note that this is the child, and
1265 * the server will still have the socket open, and it is important
1266 * that we do not shutdown it. Note that the descriptors cannot be
1267 * closed before building the environment, as we call
1268 * get_remote_ipaddr there.
1270 if (packet_get_connection_in() == packet_get_connection_out())
1271 close(packet_get_connection_in());
1273 close(packet_get_connection_in());
1274 close(packet_get_connection_out());
1277 * Close all descriptors related to channels. They will still remain
1278 * open in the parent.
1280 /* XXX better use close-on-exec? -markus */
1281 channel_close_all();
1284 * Close any extra file descriptors. Note that there may still be
1285 * descriptors left by system functions. They will be closed later.
1290 * Close any extra open file descriptors so that we don\'t have them
1291 * hanging around in clients. Note that we want to do this after
1292 * initgroups, because at least on Solaris 2.3 it leaves file
1295 for (i = 3; i < 64; i++)
1298 /* Change current directory to the user\'s home directory. */
1299 if (chdir(pw->pw_dir) < 0) {
1300 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1301 pw->pw_dir, strerror(errno));
1302 #ifdef HAVE_LOGIN_CAP
1303 if (login_getcapbool(lc, "requirehome", 0))
1309 * Must take new environment into use so that .ssh/rc, /etc/sshrc and
1310 * xauth are run in the proper environment.
1315 * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first
1318 if (!options.use_login) {
1319 if (stat(_PATH_SSH_USER_RC, &st) >= 0) {
1321 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, _PATH_SSH_USER_RC);
1323 f = popen(_PATH_BSHELL " " _PATH_SSH_USER_RC, "w");
1325 if (auth_proto != NULL && auth_data != NULL)
1326 fprintf(f, "%s %s\n", auth_proto, auth_data);
1329 fprintf(stderr, "Could not run %s\n", _PATH_SSH_USER_RC);
1330 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
1332 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, _PATH_SSH_SYSTEM_RC);
1334 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
1336 if (auth_proto != NULL && auth_data != NULL)
1337 fprintf(f, "%s %s\n", auth_proto, auth_data);
1340 fprintf(stderr, "Could not run %s\n", _PATH_SSH_SYSTEM_RC);
1341 } else if (options.xauth_location != NULL) {
1342 /* Add authority data to .Xauthority if appropriate. */
1343 if (auth_proto != NULL && auth_data != NULL) {
1344 char *screen = strchr(display, ':');
1347 "Running %.100s add %.100s %.100s %.100s\n",
1348 options.xauth_location, display,
1349 auth_proto, auth_data);
1350 #ifndef HAVE_CYGWIN /* Unix sockets are not supported */
1353 "Adding %.*s/unix%s %s %s\n",
1354 (int)(screen-display), display,
1355 screen, auth_proto, auth_data);
1358 snprintf(cmd, sizeof cmd, "%s -q -",
1359 options.xauth_location);
1360 f = popen(cmd, "w");
1362 fprintf(f, "add %s %s %s\n", display,
1363 auth_proto, auth_data);
1364 #ifndef HAVE_CYGWIN /* Unix sockets are not supported */
1366 fprintf(f, "add %.*s/unix%s %s %s\n",
1367 (int)(screen-display), display,
1368 screen, auth_proto, auth_data);
1372 fprintf(stderr, "Could not run %s\n",
1377 /* Get the last component of the shell name. */
1378 cp = strrchr(shell, '/');
1385 * If we have no command, execute the shell. In this case, the shell
1386 * name to be passed in argv[0] is preceded by '-' to indicate that
1387 * this is a login shell.
1390 if (!options.use_login) {
1394 * Check for mail if we have a tty and it was enabled
1395 * in server options.
1397 if (ttyname && options.check_mail) {
1399 struct stat mailstat;
1400 mailbox = getenv("MAIL");
1401 if (mailbox != NULL) {
1402 if (stat(mailbox, &mailstat) != 0 ||
1403 mailstat.st_size == 0)
1404 printf("No mail.\n");
1405 else if (mailstat.st_mtime < mailstat.st_atime)
1406 printf("You have mail.\n");
1408 printf("You have new mail.\n");
1411 /* Start the shell. Set initial character to '-'. */
1413 strncpy(buf + 1, cp, sizeof(buf) - 1);
1414 buf[sizeof(buf) - 1] = 0;
1416 /* Execute the shell. */
1419 execve(shell, argv, env);
1421 /* Executing the shell failed. */
1426 /* Launch login(1). */
1428 execl(LOGIN_PROGRAM, "login", "-h", hostname,
1429 "-p", "-f", "--", pw->pw_name, NULL);
1431 /* Login couldn't be executed, die. */
1438 * Execute the command using the user's shell. This uses the -c
1439 * option to execute the command.
1441 argv[0] = (char *) cp;
1443 argv[2] = (char *) command;
1445 execve(shell, argv, env);
1454 static int did_init = 0;
1456 debug("session_new: init");
1457 for(i = 0; i < MAX_SESSIONS; i++) {
1458 sessions[i].used = 0;
1459 sessions[i].self = i;
1463 for(i = 0; i < MAX_SESSIONS; i++) {
1464 Session *s = &sessions[i];
1475 s->auth_data = NULL;
1476 s->auth_proto = NULL;
1479 debug("session_new: session %d", i);
1490 for(i = 0; i < MAX_SESSIONS; i++) {
1491 Session *s = &sessions[i];
1492 debug("dump: used %d session %d %p channel %d pid %d",
1502 session_open(int chanid)
1504 Session *s = session_new();
1505 debug("session_open: channel %d", chanid);
1507 error("no more sessions");
1510 s->pw = auth_get_user();
1512 fatal("no user for session %d", s->self);
1513 debug("session_open: session %d: link with channel %d", s->self, chanid);
1519 session_by_channel(int id)
1522 for(i = 0; i < MAX_SESSIONS; i++) {
1523 Session *s = &sessions[i];
1524 if (s->used && s->chanid == id) {
1525 debug("session_by_channel: session %d channel %d", i, id);
1529 debug("session_by_channel: unknown channel %d", id);
1535 session_by_pid(pid_t pid)
1538 debug("session_by_pid: pid %d", pid);
1539 for(i = 0; i < MAX_SESSIONS; i++) {
1540 Session *s = &sessions[i];
1541 if (s->used && s->pid == pid)
1544 error("session_by_pid: unknown pid %d", pid);
1550 session_window_change_req(Session *s)
1552 s->col = packet_get_int();
1553 s->row = packet_get_int();
1554 s->xpixel = packet_get_int();
1555 s->ypixel = packet_get_int();
1557 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1562 session_pty_req(Session *s)
1565 char *term_modes; /* encoded terminal modes */
1571 s->term = packet_get_string(&len);
1572 s->col = packet_get_int();
1573 s->row = packet_get_int();
1574 s->xpixel = packet_get_int();
1575 s->ypixel = packet_get_int();
1576 term_modes = packet_get_string(&len);
1579 if (strcmp(s->term, "") == 0) {
1583 /* Allocate a pty and open it. */
1584 if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) {
1589 error("session_pty_req: session %d alloc failed", s->self);
1593 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1595 * Add a cleanup function to clear the utmp entry and record logout
1596 * time in case we call fatal() (e.g., the connection gets closed).
1598 fatal_add_cleanup(pty_cleanup_proc, (void *)s);
1599 pty_setowner(s->pw, s->tty);
1600 /* Get window size from the packet. */
1601 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1603 session_proctitle(s);
1605 /* XXX parse and set terminal modes */
1611 session_subsystem_req(Session *s)
1615 char *subsys = packet_get_string(&len);
1619 log("subsystem request for %s", subsys);
1621 for (i = 0; i < options.num_subsystems; i++) {
1622 if(strcmp(subsys, options.subsystem_name[i]) == 0) {
1623 debug("subsystem: exec() %s", options.subsystem_command[i]);
1624 do_exec_no_pty(s, options.subsystem_command[i], s->pw);
1630 log("subsystem request for %s failed, subsystem not found", subsys);
1637 session_x11_req(Session *s)
1640 if (no_x11_forwarding_flag) {
1641 debug("X11 forwarding disabled in user configuration file.");
1644 if (!options.x11_forwarding) {
1645 debug("X11 forwarding disabled in server configuration file.");
1648 if (xauthfile != NULL) {
1649 debug("X11 fwd already started.");
1653 debug("Received request for X11 forwarding with auth spoofing.");
1654 if (s->display != NULL)
1655 packet_disconnect("Protocol error: X11 display already set.");
1657 s->single_connection = packet_get_char();
1658 s->auth_proto = packet_get_string(NULL);
1659 s->auth_data = packet_get_string(NULL);
1660 s->screen = packet_get_int();
1663 s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
1664 if (s->display == NULL) {
1665 xfree(s->auth_proto);
1666 xfree(s->auth_data);
1669 xauthfile = xmalloc(MAXPATHLEN);
1670 strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
1671 temporarily_use_uid(s->pw->pw_uid);
1672 if (mkdtemp(xauthfile) == NULL) {
1674 error("private X11 dir: mkdtemp %s failed: %s",
1675 xauthfile, strerror(errno));
1678 xfree(s->auth_proto);
1679 xfree(s->auth_data);
1680 /* XXXX remove listening channels */
1683 strlcat(xauthfile, "/cookies", MAXPATHLEN);
1684 fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
1688 fatal_add_cleanup(xauthfile_cleanup_proc, s);
1693 session_shell_req(Session *s)
1695 /* if forced_command == NULL, the shell is execed */
1696 char *shell = forced_command;
1700 do_exec_no_pty(s, shell, s->pw);
1702 do_exec_pty(s, shell, s->pw);
1707 session_exec_req(Session *s)
1710 char *command = packet_get_string(&len);
1712 if (forced_command) {
1713 original_command = command;
1714 command = forced_command;
1715 debug("Forced command '%.500s'", forced_command);
1719 do_exec_no_pty(s, command, s->pw);
1721 do_exec_pty(s, command, s->pw);
1722 if (forced_command == NULL)
1728 session_auth_agent_req(Session *s)
1730 static int called = 0;
1732 if (no_agent_forwarding_flag) {
1733 debug("session_auth_agent_req: no_agent_forwarding_flag");
1740 return auth_input_request_forwarding(s->pw);
1745 session_input_channel_req(int id, void *arg)
1754 rtype = packet_get_string(&len);
1755 reply = packet_get_char();
1757 s = session_by_channel(id);
1759 fatal("session_input_channel_req: channel %d: no session", id);
1760 c = channel_lookup(id);
1762 fatal("session_input_channel_req: channel %d: bad channel", id);
1764 debug("session_input_channel_req: session %d channel %d request %s reply %d",
1765 s->self, id, rtype, reply);
1768 * a session is in LARVAL state until a shell
1769 * or programm is executed
1771 if (c->type == SSH_CHANNEL_LARVAL) {
1772 if (strcmp(rtype, "shell") == 0) {
1773 success = session_shell_req(s);
1774 } else if (strcmp(rtype, "exec") == 0) {
1775 success = session_exec_req(s);
1776 } else if (strcmp(rtype, "pty-req") == 0) {
1777 success = session_pty_req(s);
1778 } else if (strcmp(rtype, "x11-req") == 0) {
1779 success = session_x11_req(s);
1780 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1781 success = session_auth_agent_req(s);
1782 } else if (strcmp(rtype, "subsystem") == 0) {
1783 success = session_subsystem_req(s);
1786 if (strcmp(rtype, "window-change") == 0) {
1787 success = session_window_change_req(s);
1791 packet_start(success ?
1792 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1793 packet_put_int(c->remote_id);
1800 session_set_fds(Session *s, int fdin, int fdout, int fderr)
1803 fatal("session_set_fds: called for proto != 2.0");
1805 * now that have a child and a pipe to the child,
1806 * we can activate our channel and register the fd's
1808 if (s->chanid == -1)
1809 fatal("no channel for session %d", s->self);
1810 channel_set_fds(s->chanid,
1812 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1817 session_pty_cleanup(Session *s)
1819 if (s == NULL || s->ttyfd == -1)
1822 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1824 /* Cancel the cleanup function. */
1825 fatal_remove_cleanup(pty_cleanup_proc, (void *)s);
1827 /* Record that the user has logged out. */
1828 record_logout(s->pid, s->tty);
1830 /* Release the pseudo-tty. */
1831 pty_release(s->tty);
1834 * Close the server side of the socket pairs. We must do this after
1835 * the pty cleanup, so that another process doesn't get this pty
1836 * while we're still cleaning up.
1838 if (close(s->ptymaster) < 0)
1839 error("close(s->ptymaster): %s", strerror(errno));
1843 session_exit_message(Session *s, int status)
1847 fatal("session_close: no session");
1848 c = channel_lookup(s->chanid);
1850 fatal("session_close: session %d: no channel %d",
1851 s->self, s->chanid);
1852 debug("session_exit_message: session %d channel %d pid %d",
1853 s->self, s->chanid, s->pid);
1855 if (WIFEXITED(status)) {
1856 channel_request_start(s->chanid,
1858 packet_put_int(WEXITSTATUS(status));
1860 } else if (WIFSIGNALED(status)) {
1861 channel_request_start(s->chanid,
1863 packet_put_int(WTERMSIG(status));
1865 packet_put_char(WCOREDUMP(status));
1866 #else /* WCOREDUMP */
1868 #endif /* WCOREDUMP */
1869 packet_put_cstring("");
1870 packet_put_cstring("");
1873 /* Some weird exit cause. Just exit. */
1874 packet_disconnect("wait returned status %04x.", status);
1877 /* disconnect channel */
1878 debug("session_exit_message: release channel %d", s->chanid);
1879 channel_cancel_cleanup(s->chanid);
1881 * emulate a write failure with 'chan_write_failed', nobody will be
1882 * interested in data we write.
1883 * Note that we must not call 'chan_read_failed', since there could
1884 * be some more data waiting in the pipe.
1886 if (c->ostate != CHAN_OUTPUT_CLOSED)
1887 chan_write_failed(c);
1892 session_free(Session *s)
1894 debug("session_free: session %d pid %d", s->self, s->pid);
1900 xfree(s->auth_data);
1902 xfree(s->auth_proto);
1907 session_close(Session *s)
1909 session_pty_cleanup(s);
1911 session_proctitle(s);
1915 session_close_by_pid(pid_t pid, int status)
1917 Session *s = session_by_pid(pid);
1919 debug("session_close_by_pid: no session for pid %d", s->pid);
1922 if (s->chanid != -1)
1923 session_exit_message(s, status);
1928 * this is called when a channel dies before
1929 * the session 'child' itself dies
1932 session_close_by_channel(int id, void *arg)
1934 Session *s = session_by_channel(id);
1936 debug("session_close_by_channel: no session for channel %d", id);
1939 /* disconnect channel */
1940 channel_cancel_cleanup(s->chanid);
1943 debug("session_close_by_channel: channel %d kill %d", id, s->pid);
1945 /* close session immediately */
1948 /* notify child, delay session cleanup */
1949 if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0)
1950 error("session_close_by_channel: kill %d: %s",
1951 s->pid, strerror(errno));
1956 session_tty_list(void)
1958 static char buf[1024];
1961 for(i = 0; i < MAX_SESSIONS; i++) {
1962 Session *s = &sessions[i];
1963 if (s->used && s->ttyfd != -1) {
1965 strlcat(buf, ",", sizeof buf);
1966 strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1970 strlcpy(buf, "notty", sizeof buf);
1975 session_proctitle(Session *s)
1978 error("no user for session %d", s->self);
1980 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1984 do_authenticated2(Authctxt *authctxt)
1987 * Cancel the alarm we set to limit the time taken for
1991 if (startup_pipe != -1) {
1992 close(startup_pipe);
1995 #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD)
1996 if ((lc = login_getclass(authctxt->pw->pw_class)) == NULL) {
1997 error("unable to get login class");
2003 xauthfile_cleanup_proc(NULL);