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 1.94 2001/06/23 15:12:20 itojun Exp $");
51 #include "auth-options.h"
52 #include "pathnames.h"
56 #include "serverloop.h"
60 #ifdef WITH_IRIX_PROJECT
62 #endif /* WITH_IRIX_PROJECT */
64 #include <sys/resource.h>
66 #ifdef WITH_IRIX_AUDIT
68 #endif /* WITH_IRIX_AUDIT */
70 #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"
98 typedef struct Session Session;
106 int ptyfd, ttyfd, ptymaster;
107 int row, col, xpixel, ypixel;
114 int single_connection;
122 Session *session_new(void);
123 void session_set_fds(Session *, int, int, int);
124 static void session_pty_cleanup(void *);
125 void session_proctitle(Session *);
126 int session_setup_x11fwd(Session *);
127 void do_exec_pty(Session *, const char *);
128 void do_exec_no_pty(Session *, const char *);
129 void do_exec(Session *, const char *);
130 void do_login(Session *, const char *);
131 void do_child(Session *, const char *);
134 static void do_authenticated1(Authctxt *);
135 static void do_authenticated2(Authctxt *);
137 static void session_close(Session *);
138 static int session_pty_req(Session *);
141 extern ServerOptions options;
142 extern char *__progname;
143 extern int log_stderr;
144 extern int debug_flag;
145 extern u_int utmp_len;
146 extern int startup_pipe;
147 extern void destroy_sensitive_data(void);
149 /* original command from peer. */
150 const char *original_command = NULL;
153 #define MAX_SESSIONS 10
154 Session sessions[MAX_SESSIONS];
156 #ifdef WITH_AIXAUTHENTICATE
157 /* AIX's lastlogin message, set in auth1.c */
159 #endif /* WITH_AIXAUTHENTICATE */
161 #ifdef HAVE_LOGIN_CAP
162 static login_cap_t *lc;
166 do_authenticated(Authctxt *authctxt)
169 * Cancel the alarm we set to limit the time taken for
173 if (startup_pipe != -1) {
177 #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD)
178 if ((lc = login_getclass(authctxt->pw->pw_class)) == NULL) {
179 error("unable to get login class");
183 if (auth_approval(NULL, lc, authctxt->pw->pw_name, "ssh") <= 0) {
184 packet_disconnect("Approval failure for %s",
185 authctxt->pw->pw_name);
189 /* setup the channel layer */
190 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
191 channel_permit_all_opens();
194 do_authenticated2(authctxt);
196 do_authenticated1(authctxt);
198 /* remove agent socket */
199 if (auth_get_socket_name())
200 auth_sock_cleanup_proc(authctxt->pw);
204 * Prepares for an interactive session. This is called after the user has
205 * been successfully authenticated. During this message exchange, pseudo
206 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
207 * are requested, etc.
210 do_authenticated1(Authctxt *authctxt)
214 int success, type, plen, screen_flag;
215 int compression_level = 0, enable_compression_after_reply = 0;
216 u_int proto_len, data_len, dlen;
219 s->pw = authctxt->pw;
222 * We stay in this loop until the client requests to execute a shell
228 /* Get a packet from the client. */
229 type = packet_read(&plen);
231 /* Process the packet. */
233 case SSH_CMSG_REQUEST_COMPRESSION:
234 packet_integrity_check(plen, 4, type);
235 compression_level = packet_get_int();
236 if (compression_level < 1 || compression_level > 9) {
237 packet_send_debug("Received illegal compression level %d.",
241 /* Enable compression after we have responded with SUCCESS. */
242 enable_compression_after_reply = 1;
246 case SSH_CMSG_REQUEST_PTY:
247 success = session_pty_req(s);
250 case SSH_CMSG_X11_REQUEST_FORWARDING:
251 s->auth_proto = packet_get_string(&proto_len);
252 s->auth_data = packet_get_string(&data_len);
254 screen_flag = packet_get_protocol_flags() &
255 SSH_PROTOFLAG_SCREEN_NUMBER;
256 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
258 if (packet_remaining() == 4) {
260 debug2("Buggy client: "
261 "X11 screen flag missing");
262 s->screen = packet_get_int();
267 success = session_setup_x11fwd(s);
269 xfree(s->auth_proto);
271 s->auth_proto = NULL;
276 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
277 if (no_agent_forwarding_flag || compat13) {
278 debug("Authentication agent forwarding not permitted for this authentication.");
281 debug("Received authentication agent forwarding request.");
282 success = auth_input_request_forwarding(s->pw);
285 case SSH_CMSG_PORT_FORWARD_REQUEST:
286 if (no_port_forwarding_flag) {
287 debug("Port forwarding not permitted for this authentication.");
290 if (!options.allow_tcp_forwarding) {
291 debug("Port forwarding not permitted.");
294 debug("Received TCP/IP port forwarding request.");
295 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
299 case SSH_CMSG_MAX_PACKET_SIZE:
300 if (packet_set_maxsize(packet_get_int()) > 0)
304 case SSH_CMSG_EXEC_SHELL:
305 case SSH_CMSG_EXEC_CMD:
306 if (type == SSH_CMSG_EXEC_CMD) {
307 command = packet_get_string(&dlen);
308 debug("Exec command '%.500s'", command);
320 * Any unknown messages in this phase are ignored,
321 * and a failure message is returned.
323 log("Unknown packet type received after authentication: %d", type);
325 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
329 /* Enable compression now that we have replied if appropriate. */
330 if (enable_compression_after_reply) {
331 enable_compression_after_reply = 0;
332 packet_start_compression(compression_level);
338 * This is called to fork and execute a command when we have no tty. This
339 * will call do_child from the child, and server_loop from the parent after
340 * setting up file descriptors and such.
343 do_exec_no_pty(Session *s, const char *command)
348 int pin[2], pout[2], perr[2];
349 /* Allocate pipes for communicating with the program. */
350 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
351 packet_disconnect("Could not create pipes: %.100s",
353 #else /* USE_PIPES */
354 int inout[2], err[2];
355 /* Uses socket pairs to communicate with the program. */
356 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
357 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
358 packet_disconnect("Could not create socket pairs: %.100s",
360 #endif /* USE_PIPES */
362 fatal("do_exec_no_pty: no session");
364 session_proctitle(s);
367 do_pam_session(s->pw->pw_name, NULL);
371 /* Fork the child. */
372 if ((pid = fork()) == 0) {
373 /* Child. Reinitialize the log since the pid has changed. */
374 log_init(__progname, options.log_level, options.log_facility, log_stderr);
377 * Create a new session and process group since the 4.4BSD
378 * setlogin() affects the entire process group.
381 error("setsid failed: %.100s", strerror(errno));
385 * Redirect stdin. We close the parent side of the socket
386 * pair, and make the child side the standard input.
389 if (dup2(pin[0], 0) < 0)
390 perror("dup2 stdin");
393 /* Redirect stdout. */
395 if (dup2(pout[1], 1) < 0)
396 perror("dup2 stdout");
399 /* Redirect stderr. */
401 if (dup2(perr[1], 2) < 0)
402 perror("dup2 stderr");
404 #else /* USE_PIPES */
406 * Redirect stdin, stdout, and stderr. Stdin and stdout will
407 * use the same socket, as some programs (particularly rdist)
408 * seem to depend on it.
412 if (dup2(inout[0], 0) < 0) /* stdin */
413 perror("dup2 stdin");
414 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
415 perror("dup2 stdout");
416 if (dup2(err[0], 2) < 0) /* stderr */
417 perror("dup2 stderr");
418 #endif /* USE_PIPES */
420 /* Do processing for the child (exec command etc). */
421 do_child(s, command);
426 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
429 packet_disconnect("fork failed: %.100s", strerror(errno));
431 /* Set interactive/non-interactive mode. */
432 packet_set_interactive(s->display != NULL);
434 /* We are the parent. Close the child sides of the pipes. */
440 session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]);
442 /* Enter the interactive session. */
443 server_loop(pid, pin[1], pout[0], perr[0]);
444 /* server_loop has closed pin[1], pout[0], and perr[0]. */
446 #else /* USE_PIPES */
447 /* We are the parent. Close the child sides of the socket pairs. */
452 * Enter the interactive session. Note: server_loop must be able to
453 * handle the case that fdin and fdout are the same.
456 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
458 server_loop(pid, inout[1], inout[1], err[1]);
459 /* server_loop has closed inout[1] and err[1]. */
461 #endif /* USE_PIPES */
465 * This is called to fork and execute a command when we have a tty. This
466 * will call do_child from the child, and server_loop from the parent after
467 * setting up file descriptors, controlling tty, updating wtmp, utmp,
468 * lastlog, and other such operations.
471 do_exec_pty(Session *s, const char *command)
473 int fdout, ptyfd, ttyfd, ptymaster;
477 fatal("do_exec_pty: no session");
482 do_pam_session(s->pw->pw_name, s->tty);
486 /* Fork the child. */
487 if ((pid = fork()) == 0) {
488 /* Child. Reinitialize the log because the pid has changed. */
489 log_init(__progname, options.log_level, options.log_facility, log_stderr);
491 /* Close the master side of the pseudo tty. */
494 /* Make the pseudo tty our controlling tty. */
495 pty_make_controlling_tty(&ttyfd, s->tty);
497 /* Redirect stdin from the pseudo tty. */
498 if (dup2(ttyfd, fileno(stdin)) < 0)
499 error("dup2 stdin failed: %.100s", strerror(errno));
501 /* Redirect stdout to the pseudo tty. */
502 if (dup2(ttyfd, fileno(stdout)) < 0)
503 error("dup2 stdin failed: %.100s", strerror(errno));
505 /* Redirect stderr to the pseudo tty. */
506 if (dup2(ttyfd, fileno(stderr)) < 0)
507 error("dup2 stdin failed: %.100s", strerror(errno));
509 /* Close the extra descriptor for the pseudo tty. */
512 /* record login, etc. similar to login(1) */
514 if (!(options.use_login && command == NULL))
515 do_login(s, command);
516 # ifdef LOGIN_NEEDS_UTMPX
522 /* Do common processing for the child, such as execing the command. */
523 do_child(s, command);
528 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
531 packet_disconnect("fork failed: %.100s", strerror(errno));
534 /* Parent. Close the slave side of the pseudo tty. */
538 * Create another descriptor of the pty master side for use as the
539 * standard input. We could use the original descriptor, but this
540 * simplifies code in server_loop. The descriptor is bidirectional.
544 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
546 /* we keep a reference to the pty master */
547 ptymaster = dup(ptyfd);
549 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
550 s->ptymaster = ptymaster;
552 /* Enter interactive session. */
553 packet_set_interactive(1);
555 session_set_fds(s, ptyfd, fdout, -1);
557 server_loop(pid, ptyfd, fdout, -1);
558 /* server_loop _has_ closed ptyfd and fdout. */
562 #ifdef LOGIN_NEEDS_UTMPX
564 do_pre_login(Session *s)
567 struct sockaddr_storage from;
568 pid_t pid = getpid();
571 * Get IP address of client. If the connection is not a socket, let
572 * the address be 0.0.0.0.
574 memset(&from, 0, sizeof(from));
575 if (packet_connection_is_on_socket()) {
576 fromlen = sizeof(from);
577 if (getpeername(packet_get_connection_in(),
578 (struct sockaddr *) & from, &fromlen) < 0) {
579 debug("getpeername: %.100s", strerror(errno));
584 record_utmp_only(pid, s->tty, s->pw->pw_name,
585 get_remote_name_or_ip(utmp_len, options.reverse_mapping_check),
586 (struct sockaddr *)&from);
591 * This is called to fork and execute a command. If another command is
592 * to be forced, execute that instead.
595 do_exec(Session *s, const char *command)
597 if (forced_command) {
598 original_command = command;
599 command = forced_command;
600 debug("Forced command '%.900s'", command);
604 do_exec_pty(s, command);
606 do_exec_no_pty(s, command);
608 original_command = NULL;
612 * Check for quiet login, either .hushlogin or command given.
615 check_quietlogin(Session *s, const char *command)
618 struct passwd * pw = s->pw;
621 /* Return 1 if .hushlogin exists or a command given. */
624 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
625 #ifdef HAVE_LOGIN_CAP
626 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
629 if (stat(buf, &st) >= 0)
635 /* administrative, login(1)-like work */
637 do_login(Session *s, const char *command)
640 char hostname[MAXHOSTNAMELEN];
642 struct sockaddr_storage from;
643 time_t last_login_time;
644 struct passwd * pw = s->pw;
645 pid_t pid = getpid();
648 * Get IP address of client. If the connection is not a socket, let
649 * the address be 0.0.0.0.
651 memset(&from, 0, sizeof(from));
652 if (packet_connection_is_on_socket()) {
653 fromlen = sizeof(from);
654 if (getpeername(packet_get_connection_in(),
655 (struct sockaddr *) & from, &fromlen) < 0) {
656 debug("getpeername: %.100s", strerror(errno));
661 /* Get the time and hostname when the user last logged in. */
662 if (options.print_lastlog) {
664 last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name,
665 hostname, sizeof(hostname));
668 /* Record that there was a login on that tty from the remote host. */
669 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
670 get_remote_name_or_ip(utmp_len, options.reverse_mapping_check),
671 (struct sockaddr *)&from);
675 * If password change is needed, do it now.
676 * This needs to occur before the ~/.hushlogin check.
678 if (is_pam_password_change_required()) {
679 print_pam_messages();
684 if (check_quietlogin(s, command))
688 if (!is_pam_password_change_required())
689 print_pam_messages();
691 #ifdef WITH_AIXAUTHENTICATE
692 if (aixloginmsg && *aixloginmsg)
693 printf("%s\n", aixloginmsg);
694 #endif /* WITH_AIXAUTHENTICATE */
696 if (options.print_lastlog && last_login_time != 0) {
697 time_string = ctime(&last_login_time);
698 if (strchr(time_string, '\n'))
699 *strchr(time_string, '\n') = 0;
700 if (strcmp(hostname, "") == 0)
701 printf("Last login: %s\r\n", time_string);
703 printf("Last login: %s from %s\r\n", time_string, hostname);
710 * Display the message of the day.
718 if (options.print_motd) {
719 #ifdef HAVE_LOGIN_CAP
720 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
723 f = fopen("/etc/motd", "r");
726 while (fgets(buf, sizeof(buf), f))
734 * Sets the value of the given variable in the environment. If the variable
735 * already exists, its value is overriden.
738 child_set_env(char ***envp, u_int *envsizep, const char *name,
745 * Find the slot where the value should be stored. If the variable
746 * already exists, we reuse the slot; otherwise we append a new slot
747 * at the end of the array, expanding if necessary.
750 namelen = strlen(name);
751 for (i = 0; env[i]; i++)
752 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
755 /* Reuse the slot. */
758 /* New variable. Expand if necessary. */
759 if (i >= (*envsizep) - 1) {
761 env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
763 /* Need to set the NULL pointer at end of array beyond the new slot. */
767 /* Allocate space and format the variable in the appropriate slot. */
768 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
769 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
773 * Reads environment variables from the given file and adds/overrides them
774 * into the environment. If the file does not exist, this does nothing.
775 * Otherwise, it must consist of empty lines, comments (line starts with '#')
776 * and assignments of the form name=value. No other forms are allowed.
779 read_environment_file(char ***env, u_int *envsize,
780 const char *filename)
786 f = fopen(filename, "r");
790 while (fgets(buf, sizeof(buf), f)) {
791 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
793 if (!*cp || *cp == '#' || *cp == '\n')
795 if (strchr(cp, '\n'))
796 *strchr(cp, '\n') = '\0';
797 value = strchr(cp, '=');
799 fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf);
803 * Replace the equals sign by nul, and advance value to
808 child_set_env(env, envsize, cp, value);
815 * Sets any environment variables which have been specified by PAM
817 void do_pam_environment(char ***env, u_int *envsize)
819 char *equals, var_name[512], var_val[512];
823 if ((pam_env = fetch_pam_environment()) == NULL)
826 for(i = 0; pam_env[i] != NULL; i++) {
827 if ((equals = strstr(pam_env[i], "=")) == NULL)
830 if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) {
831 memset(var_name, '\0', sizeof(var_name));
832 memset(var_val, '\0', sizeof(var_val));
834 strncpy(var_name, pam_env[i], equals - pam_env[i]);
835 strcpy(var_val, equals + 1);
837 debug3("PAM environment: %s=%s", var_name, var_val);
839 child_set_env(env, envsize, var_name, var_val);
846 void copy_environment(char ***env, u_int *envsize)
848 char *equals, var_name[512], var_val[512];
851 for(i = 0; environ[i] != NULL; i++) {
852 if ((equals = strstr(environ[i], "=")) == NULL)
855 if (strlen(environ[i]) < (sizeof(var_name) - 1)) {
856 memset(var_name, '\0', sizeof(var_name));
857 memset(var_val, '\0', sizeof(var_val));
859 strncpy(var_name, environ[i], equals - environ[i]);
860 strcpy(var_val, equals + 1);
862 debug3("Copy environment: %s=%s", var_name, var_val);
864 child_set_env(env, envsize, var_name, var_val);
870 #if defined(HAVE_GETUSERATTR)
872 * AIX-specific login initialisation
874 void set_limit(char *user, char *soft, char *hard, int resource, int mult)
879 getrlimit(resource, &rlim);
882 if (getuserattr(user, soft, &slim, SEC_INT) != -1) {
884 rlim.rlim_cur = RLIM_INFINITY;
885 } else if (slim != 0) {
886 /* See the wackiness below */
887 if (rlim.rlim_cur == slim * mult)
890 rlim.rlim_cur = slim * mult;
895 if (getuserattr(user, hard, &hlim, SEC_INT) != -1) {
897 rlim.rlim_max = RLIM_INFINITY;
898 } else if (hlim != 0) {
899 rlim.rlim_max = hlim * mult;
904 * XXX For cpu and fsize the soft limit is set to the hard limit
905 * if the hard limit is left at its default value and the soft limit
906 * is changed from its default value, either by requesting it
907 * (slim == 0) or by setting it to the current default. At least
908 * that's how rlogind does it. If you're confused you're not alone.
909 * Bug or feature? AIX 4.3.1.2
911 if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu"))
912 && hlim == 0 && slim != 0)
913 rlim.rlim_max = rlim.rlim_cur;
914 /* A specified hard limit limits the soft limit */
915 else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max)
916 rlim.rlim_cur = rlim.rlim_max;
917 /* A soft limit can increase a hard limit */
918 else if (rlim.rlim_cur > rlim.rlim_max)
919 rlim.rlim_max = rlim.rlim_cur;
921 if (setrlimit(resource, &rlim) != 0)
922 error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno));
925 void set_limits_from_userattr(char *user)
930 set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512);
931 set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1);
932 set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512);
933 set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512);
934 set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512);
935 set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512);
936 #if defined(S_UNOFILE)
937 set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1);
940 if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) {
941 /* Convert decimal to octal */
942 (void) snprintf(buf, sizeof(buf), "%d", mask);
943 if (sscanf(buf, "%o", &mask) == 1)
947 #endif /* defined(HAVE_GETUSERATTR) */
950 * Performs common processing for the child, such as setting up the
951 * environment, closing extra file descriptors, setting the user and group
952 * ids, and executing the command or shell.
955 do_child(Session *s, const char *command)
957 const char *shell, *hostname = NULL, *cp = NULL;
958 struct passwd * pw = s->pw;
964 extern char **environ;
968 #ifdef WITH_IRIX_PROJECT
970 #endif /* WITH_IRIX_PROJECT */
971 #ifdef WITH_IRIX_JOBS
974 #ifdef WITH_IRIX_ARRAY
976 #endif /* WITH_IRIX_ARRAY */
977 #endif /* WITH_IRIX_JOBS */
980 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
982 /* remove hostkey from the child's memory */
983 destroy_sensitive_data();
985 /* login(1) is only called if we execute the login shell */
986 if (options.use_login && command != NULL)
987 options.use_login = 0;
989 #if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
990 if (!options.use_login) {
991 # ifdef HAVE_LOGIN_CAP
992 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
993 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
994 _PATH_NOLOGIN), "r");
995 # else /* HAVE_LOGIN_CAP */
997 f = fopen(_PATH_NOLOGIN, "r");
998 # endif /* HAVE_LOGIN_CAP */
1000 /* /etc/nologin exists. Print its contents and exit. */
1001 while (fgets(buf, sizeof(buf), f))
1007 #endif /* USE_PAM || HAVE_OSF_SIA */
1009 /* Set login name, uid, gid, and groups. */
1010 /* Login(1) does this as well, and it needs uid 0 for the "-h"
1011 switch, so we let login(1) to this for us. */
1012 if (!options.use_login) {
1014 session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty);
1015 if (!check_quietlogin(s, command))
1017 #else /* HAVE_OSF_SIA */
1021 if (getuid() == 0 || geteuid() == 0) {
1023 # ifdef HAVE_GETUSERATTR
1024 set_limits_from_userattr(pw->pw_name);
1025 # endif /* HAVE_GETUSERATTR */
1026 # ifdef HAVE_LOGIN_CAP
1027 if (setusercontext(lc, pw, pw->pw_uid,
1028 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1029 perror("unable to set user context");
1032 # else /* HAVE_LOGIN_CAP */
1033 #if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
1034 /* Sets login uid for accounting */
1035 if (getluid() == -1 && setluid(pw->pw_uid) == -1)
1036 error("setluid: %s", strerror(errno));
1037 #endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
1039 if (setlogin(pw->pw_name) < 0)
1040 error("setlogin failed: %s", strerror(errno));
1041 if (setgid(pw->pw_gid) < 0) {
1045 /* Initialize the group list. */
1046 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1047 perror("initgroups");
1053 * PAM credentials may take the form of
1054 * supplementary groups. These will have been
1055 * wiped by the above initgroups() call.
1056 * Reestablish them here.
1059 # endif /* USE_PAM */
1060 # ifdef WITH_IRIX_JOBS
1061 jid = jlimit_startjob(pw->pw_name, pw->pw_uid, "interactive");
1063 fatal("Failed to create job container: %.100s",
1066 # endif /* WITH_IRIX_JOBS */
1067 # ifdef WITH_IRIX_ARRAY
1068 /* initialize array session */
1070 if (newarraysess() != 0)
1071 fatal("Failed to set up new array session: %.100s",
1074 # endif /* WITH_IRIX_ARRAY */
1075 # ifdef WITH_IRIX_PROJECT
1076 /* initialize irix project info */
1077 if ((projid = getdfltprojuser(pw->pw_name)) == -1) {
1078 debug("Failed to get project id, using projid 0");
1081 if (setprid(projid))
1082 fatal("Failed to initialize project %d for %s: %.100s",
1083 (int)projid, pw->pw_name, strerror(errno));
1084 # endif /* WITH_IRIX_PROJECT */
1085 #ifdef WITH_IRIX_AUDIT
1086 if (sysconf(_SC_AUDIT)) {
1087 debug("Setting sat id to %d", (int) pw->pw_uid);
1088 if (satsetid(pw->pw_uid))
1089 debug("error setting satid: %.100s", strerror(errno));
1091 #endif /* WITH_IRIX_AUDIT */
1095 * AIX has a "usrinfo" area where logname and
1096 * other stuff is stored - a few applications
1097 * actually use this and die if it's not set
1101 cp = xmalloc(22 + strlen(s->tty) +
1102 2 * strlen(pw->pw_name));
1103 i = sprintf(cp, "LOGNAME=%s%cNAME=%s%cTTY=%s%c%c",
1104 pw->pw_name, 0, pw->pw_name, 0, s->tty, 0, 0);
1105 if (usrinfo(SETUINFO, cp, i) == -1)
1106 fatal("Couldn't set usrinfo: %s",
1108 debug3("AIX/UsrInfo: set len %d", i);
1112 /* Permanently switch to the desired uid. */
1113 permanently_set_uid(pw);
1114 # endif /* HAVE_LOGIN_CAP */
1116 #endif /* HAVE_OSF_SIA */
1121 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1122 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1125 * Get the shell from the password data. An empty shell field is
1126 * legal, and means /bin/sh.
1128 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1129 #ifdef HAVE_LOGIN_CAP
1130 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1134 /* Try to get AFS tokens for the local cell. */
1138 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1139 krb_afslog(cell, 0);
1145 /* Initialize the environment. */
1147 env = xmalloc(envsize * sizeof(char *));
1152 * The Windows environment contains some setting which are
1153 * important for a running system. They must not be dropped.
1155 copy_environment(&env, &envsize);
1158 if (!options.use_login) {
1159 /* Set basic environment. */
1160 child_set_env(&env, &envsize, "USER", pw->pw_name);
1161 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
1162 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
1163 #ifdef HAVE_LOGIN_CAP
1164 (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH);
1165 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1166 #else /* HAVE_LOGIN_CAP */
1167 # ifndef HAVE_CYGWIN
1169 * There's no standard path on Windows. The path contains
1170 * important components pointing to the system directories,
1171 * needed for loading shared libraries. So the path better
1172 * remains intact here.
1174 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1175 # endif /* HAVE_CYGWIN */
1176 #endif /* HAVE_LOGIN_CAP */
1178 snprintf(buf, sizeof buf, "%.200s/%.50s",
1179 _PATH_MAILDIR, pw->pw_name);
1180 child_set_env(&env, &envsize, "MAIL", buf);
1182 /* Normal systems set SHELL by default. */
1183 child_set_env(&env, &envsize, "SHELL", shell);
1186 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1188 /* Set custom environment options from RSA authentication. */
1189 while (custom_environment) {
1190 struct envstring *ce = custom_environment;
1193 for (i = 0; s[i] != '=' && s[i]; i++);
1196 child_set_env(&env, &envsize, s, s + i + 1);
1198 custom_environment = ce->next;
1203 snprintf(buf, sizeof buf, "%.50s %d %d",
1204 get_remote_ipaddr(), get_remote_port(), get_local_port());
1205 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1208 child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1210 child_set_env(&env, &envsize, "TERM", s->term);
1212 child_set_env(&env, &envsize, "DISPLAY", s->display);
1213 if (original_command)
1214 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1218 if ((cp = getenv("AUTHSTATE")) != NULL)
1219 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1220 if ((cp = getenv("KRB5CCNAME")) != NULL)
1221 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1222 read_environment_file(&env, &envsize, "/etc/environment");
1227 extern char *ticket;
1230 child_set_env(&env, &envsize, "KRBTKFILE", ticket);
1235 /* Pull in any environment variables that may have been set by PAM. */
1236 do_pam_environment(&env, &envsize);
1237 #endif /* USE_PAM */
1239 if (auth_get_socket_name() != NULL)
1240 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1241 auth_get_socket_name());
1243 /* read $HOME/.ssh/environment. */
1244 if (!options.use_login) {
1245 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1247 read_environment_file(&env, &envsize, buf);
1250 /* dump the environment */
1251 fprintf(stderr, "Environment:\n");
1252 for (i = 0; env[i]; i++)
1253 fprintf(stderr, " %.200s\n", env[i]);
1255 /* we have to stash the hostname before we close our socket. */
1256 if (options.use_login)
1257 hostname = get_remote_name_or_ip(utmp_len,
1258 options.reverse_mapping_check);
1260 * Close the connection descriptors; note that this is the child, and
1261 * the server will still have the socket open, and it is important
1262 * that we do not shutdown it. Note that the descriptors cannot be
1263 * closed before building the environment, as we call
1264 * get_remote_ipaddr there.
1266 if (packet_get_connection_in() == packet_get_connection_out())
1267 close(packet_get_connection_in());
1269 close(packet_get_connection_in());
1270 close(packet_get_connection_out());
1273 * Close all descriptors related to channels. They will still remain
1274 * open in the parent.
1276 /* XXX better use close-on-exec? -markus */
1277 channel_close_all();
1280 * Close any extra file descriptors. Note that there may still be
1281 * descriptors left by system functions. They will be closed later.
1286 * Close any extra open file descriptors so that we don\'t have them
1287 * hanging around in clients. Note that we want to do this after
1288 * initgroups, because at least on Solaris 2.3 it leaves file
1291 for (i = 3; i < 64; i++)
1294 /* Change current directory to the user\'s home directory. */
1295 if (chdir(pw->pw_dir) < 0) {
1296 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1297 pw->pw_dir, strerror(errno));
1298 #ifdef HAVE_LOGIN_CAP
1299 if (login_getcapbool(lc, "requirehome", 0))
1305 * Must take new environment into use so that .ssh/rc, /etc/sshrc and
1306 * xauth are run in the proper environment.
1311 * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first
1314 if (!options.use_login) {
1315 /* ignore _PATH_SSH_USER_RC for subsystems */
1316 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
1317 snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
1318 shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
1320 fprintf(stderr, "Running %s\n", cmd);
1321 f = popen(cmd, "w");
1324 fprintf(f, "%s %s\n", s->auth_proto,
1328 fprintf(stderr, "Could not run %s\n",
1330 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
1332 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
1333 _PATH_SSH_SYSTEM_RC);
1334 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
1337 fprintf(f, "%s %s\n", s->auth_proto,
1341 fprintf(stderr, "Could not run %s\n",
1342 _PATH_SSH_SYSTEM_RC);
1343 } else if (do_xauth && options.xauth_location != NULL) {
1344 /* Add authority data to .Xauthority if appropriate. */
1345 char *screen = strchr(s->display, ':');
1349 "Running %.100s add "
1350 "%.100s %.100s %.100s\n",
1351 options.xauth_location, s->display,
1352 s->auth_proto, s->auth_data);
1355 "Adding %.*s/unix%s %s %s\n",
1356 (int)(screen - s->display),
1358 s->auth_proto, s->auth_data);
1360 snprintf(cmd, sizeof cmd, "%s -q -",
1361 options.xauth_location);
1362 f = popen(cmd, "w");
1364 fprintf(f, "add %s %s %s\n", s->display,
1365 s->auth_proto, s->auth_data);
1367 fprintf(f, "add %.*s/unix%s %s %s\n",
1368 (int)(screen - s->display),
1374 fprintf(stderr, "Could not run %s\n",
1378 /* Get the last component of the shell name. */
1379 cp = strrchr(shell, '/');
1386 /* restore SIGPIPE for child */
1387 signal(SIGPIPE, SIG_DFL);
1390 * If we have no command, execute the shell. In this case, the shell
1391 * name to be passed in argv[0] is preceded by '-' to indicate that
1392 * this is a login shell.
1395 if (!options.use_login) {
1399 * Check for mail if we have a tty and it was enabled
1400 * in server options.
1402 if (s->ttyfd != -1 && options.check_mail) {
1404 struct stat mailstat;
1406 mailbox = getenv("MAIL");
1407 if (mailbox != NULL) {
1408 if (stat(mailbox, &mailstat) != 0 ||
1409 mailstat.st_size == 0)
1410 printf("No mail.\n");
1411 else if (mailstat.st_mtime < mailstat.st_atime)
1412 printf("You have mail.\n");
1414 printf("You have new mail.\n");
1417 /* Start the shell. Set initial character to '-'. */
1419 strncpy(buf + 1, cp, sizeof(buf) - 1);
1420 buf[sizeof(buf) - 1] = 0;
1422 /* Execute the shell. */
1425 execve(shell, argv, env);
1427 /* Executing the shell failed. */
1432 /* Launch login(1). */
1434 execl(LOGIN_PROGRAM, "login", "-h", hostname,
1435 #ifdef LOGIN_NEEDS_TERM
1436 s->term? s->term : "unknown",
1438 "-p", "-f", "--", pw->pw_name, NULL);
1440 /* Login couldn't be executed, die. */
1447 * Execute the command using the user's shell. This uses the -c
1448 * option to execute the command.
1450 argv[0] = (char *) cp;
1452 argv[2] = (char *) command;
1454 execve(shell, argv, env);
1463 static int did_init = 0;
1465 debug("session_new: init");
1466 for(i = 0; i < MAX_SESSIONS; i++) {
1467 sessions[i].used = 0;
1471 for(i = 0; i < MAX_SESSIONS; i++) {
1472 Session *s = &sessions[i];
1474 memset(s, 0, sizeof(*s));
1480 debug("session_new: session %d", i);
1491 for(i = 0; i < MAX_SESSIONS; i++) {
1492 Session *s = &sessions[i];
1493 debug("dump: used %d session %d %p channel %d pid %d",
1503 session_open(int chanid)
1505 Session *s = session_new();
1506 debug("session_open: channel %d", chanid);
1508 error("no more sessions");
1511 s->pw = auth_get_user();
1513 fatal("no user for session %d", s->self);
1514 debug("session_open: session %d: link with channel %d", s->self, chanid);
1520 session_by_channel(int id)
1523 for(i = 0; i < MAX_SESSIONS; i++) {
1524 Session *s = &sessions[i];
1525 if (s->used && s->chanid == id) {
1526 debug("session_by_channel: session %d channel %d", i, id);
1530 debug("session_by_channel: unknown channel %d", id);
1536 session_by_pid(pid_t pid)
1539 debug("session_by_pid: pid %d", pid);
1540 for(i = 0; i < MAX_SESSIONS; i++) {
1541 Session *s = &sessions[i];
1542 if (s->used && s->pid == pid)
1545 error("session_by_pid: unknown pid %d", pid);
1551 session_window_change_req(Session *s)
1553 s->col = packet_get_int();
1554 s->row = packet_get_int();
1555 s->xpixel = packet_get_int();
1556 s->ypixel = packet_get_int();
1558 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1563 session_pty_req(Session *s)
1569 debug("Allocating a pty not permitted for this authentication.");
1572 if (s->ttyfd != -1) {
1573 packet_disconnect("Protocol error: you already have a pty.");
1577 s->term = packet_get_string(&len);
1580 s->col = packet_get_int();
1581 s->row = packet_get_int();
1583 s->row = packet_get_int();
1584 s->col = packet_get_int();
1586 s->xpixel = packet_get_int();
1587 s->ypixel = packet_get_int();
1589 if (strcmp(s->term, "") == 0) {
1594 /* Allocate a pty and open it. */
1595 debug("Allocating pty.");
1596 if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) {
1602 error("session_pty_req: session %d alloc failed", s->self);
1605 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1607 /* for SSH1 the tty modes length is not given */
1609 n_bytes = packet_remaining();
1610 tty_parse_modes(s->ttyfd, &n_bytes);
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(session_pty_cleanup, (void *)s);
1617 pty_setowner(s->pw, s->tty);
1619 /* Set window size from the packet. */
1620 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1623 session_proctitle(s);
1628 session_subsystem_req(Session *s)
1632 char *subsys = packet_get_string(&len);
1636 log("subsystem request for %s", subsys);
1638 for (i = 0; i < options.num_subsystems; i++) {
1639 if(strcmp(subsys, options.subsystem_name[i]) == 0) {
1640 debug("subsystem: exec() %s", options.subsystem_command[i]);
1641 s->is_subsystem = 1;
1642 do_exec_no_pty(s, options.subsystem_command[i]);
1648 log("subsystem request for %s failed, subsystem not found", subsys);
1655 session_x11_req(Session *s)
1659 s->single_connection = packet_get_char();
1660 s->auth_proto = packet_get_string(NULL);
1661 s->auth_data = packet_get_string(NULL);
1662 s->screen = packet_get_int();
1665 success = session_setup_x11fwd(s);
1667 xfree(s->auth_proto);
1668 xfree(s->auth_data);
1669 s->auth_proto = NULL;
1670 s->auth_data = NULL;
1676 session_shell_req(Session *s)
1684 session_exec_req(Session *s)
1687 char *command = packet_get_string(&len);
1689 do_exec(s, command);
1695 session_auth_agent_req(Session *s)
1697 static int called = 0;
1699 if (no_agent_forwarding_flag) {
1700 debug("session_auth_agent_req: no_agent_forwarding_flag");
1707 return auth_input_request_forwarding(s->pw);
1712 session_input_channel_req(int id, void *arg)
1721 rtype = packet_get_string(&len);
1722 reply = packet_get_char();
1724 s = session_by_channel(id);
1726 fatal("session_input_channel_req: channel %d: no session", id);
1727 c = channel_lookup(id);
1729 fatal("session_input_channel_req: channel %d: bad channel", id);
1731 debug("session_input_channel_req: session %d channel %d request %s reply %d",
1732 s->self, id, rtype, reply);
1735 * a session is in LARVAL state until a shell, a command
1736 * or a subsystem is executed
1738 if (c->type == SSH_CHANNEL_LARVAL) {
1739 if (strcmp(rtype, "shell") == 0) {
1740 success = session_shell_req(s);
1741 } else if (strcmp(rtype, "exec") == 0) {
1742 success = session_exec_req(s);
1743 } else if (strcmp(rtype, "pty-req") == 0) {
1744 success = session_pty_req(s);
1745 } else if (strcmp(rtype, "x11-req") == 0) {
1746 success = session_x11_req(s);
1747 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1748 success = session_auth_agent_req(s);
1749 } else if (strcmp(rtype, "subsystem") == 0) {
1750 success = session_subsystem_req(s);
1753 if (strcmp(rtype, "window-change") == 0) {
1754 success = session_window_change_req(s);
1758 packet_start(success ?
1759 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1760 packet_put_int(c->remote_id);
1767 session_set_fds(Session *s, int fdin, int fdout, int fderr)
1770 fatal("session_set_fds: called for proto != 2.0");
1772 * now that have a child and a pipe to the child,
1773 * we can activate our channel and register the fd's
1775 if (s->chanid == -1)
1776 fatal("no channel for session %d", s->self);
1777 channel_set_fds(s->chanid,
1779 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1784 * Function to perform pty cleanup. Also called if we get aborted abnormally
1785 * (e.g., due to a dropped connection).
1788 session_pty_cleanup(void *session)
1790 Session *s = session;
1793 error("session_pty_cleanup: no session");
1799 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1801 /* Record that the user has logged out. */
1803 record_logout(s->pid, s->tty);
1805 /* Release the pseudo-tty. */
1806 pty_release(s->tty);
1809 * Close the server side of the socket pairs. We must do this after
1810 * the pty cleanup, so that another process doesn't get this pty
1811 * while we're still cleaning up.
1813 if (close(s->ptymaster) < 0)
1814 error("close(s->ptymaster): %s", strerror(errno));
1818 session_exit_message(Session *s, int status)
1822 fatal("session_close: no session");
1823 c = channel_lookup(s->chanid);
1825 fatal("session_exit_message: session %d: no channel %d",
1826 s->self, s->chanid);
1827 debug("session_exit_message: session %d channel %d pid %d",
1828 s->self, s->chanid, s->pid);
1830 if (WIFEXITED(status)) {
1831 channel_request_start(s->chanid,
1833 packet_put_int(WEXITSTATUS(status));
1835 } else if (WIFSIGNALED(status)) {
1836 channel_request_start(s->chanid,
1838 packet_put_int(WTERMSIG(status));
1840 packet_put_char(WCOREDUMP(status));
1841 #else /* WCOREDUMP */
1843 #endif /* WCOREDUMP */
1844 packet_put_cstring("");
1845 packet_put_cstring("");
1848 /* Some weird exit cause. Just exit. */
1849 packet_disconnect("wait returned status %04x.", status);
1852 /* disconnect channel */
1853 debug("session_exit_message: release channel %d", s->chanid);
1854 channel_cancel_cleanup(s->chanid);
1856 * emulate a write failure with 'chan_write_failed', nobody will be
1857 * interested in data we write.
1858 * Note that we must not call 'chan_read_failed', since there could
1859 * be some more data waiting in the pipe.
1861 if (c->ostate != CHAN_OUTPUT_CLOSED)
1862 chan_write_failed(c);
1867 session_close(Session *s)
1869 debug("session_close: session %d pid %d", s->self, s->pid);
1870 if (s->ttyfd != -1) {
1871 fatal_remove_cleanup(session_pty_cleanup, (void *)s);
1872 session_pty_cleanup(s);
1879 xfree(s->auth_data);
1881 xfree(s->auth_proto);
1883 session_proctitle(s);
1887 session_close_by_pid(pid_t pid, int status)
1889 Session *s = session_by_pid(pid);
1891 debug("session_close_by_pid: no session for pid %d", pid);
1894 if (s->chanid != -1)
1895 session_exit_message(s, status);
1900 * this is called when a channel dies before
1901 * the session 'child' itself dies
1904 session_close_by_channel(int id, void *arg)
1906 Session *s = session_by_channel(id);
1908 debug("session_close_by_channel: no session for channel %d", id);
1911 /* disconnect channel */
1912 channel_cancel_cleanup(s->chanid);
1915 debug("session_close_by_channel: channel %d kill %d", id, s->pid);
1917 /* close session immediately */
1920 /* notify child, delay session cleanup */
1921 if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0)
1922 error("session_close_by_channel: kill %d: %s",
1923 s->pid, strerror(errno));
1928 session_tty_list(void)
1930 static char buf[1024];
1933 for(i = 0; i < MAX_SESSIONS; i++) {
1934 Session *s = &sessions[i];
1935 if (s->used && s->ttyfd != -1) {
1937 strlcat(buf, ",", sizeof buf);
1938 strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1942 strlcpy(buf, "notty", sizeof buf);
1947 session_proctitle(Session *s)
1950 error("no user for session %d", s->self);
1952 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1956 session_setup_x11fwd(Session *s)
1960 if (no_x11_forwarding_flag) {
1961 packet_send_debug("X11 forwarding disabled in user configuration file.");
1964 if (!options.x11_forwarding) {
1965 debug("X11 forwarding disabled in server configuration file.");
1968 if (!options.xauth_location ||
1969 (stat(options.xauth_location, &st) == -1)) {
1970 packet_send_debug("No xauth program; cannot forward with spoofing.");
1973 if (options.use_login) {
1974 packet_send_debug("X11 forwarding disabled; "
1975 "not compatible with UseLogin=yes.");
1978 if (s->display != NULL) {
1979 debug("X11 display already set.");
1982 s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
1983 if (s->display == NULL) {
1984 debug("x11_create_display_inet failed.");
1991 do_authenticated2(Authctxt *authctxt)