2 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * As far as I am concerned, the code I have written for this software
6 * can be used freely for any purpose. Any derived versions of this
7 * software must be clearly marked as such, and if the derived work is
8 * incompatible with the protocol description in the RFC file, it must be
9 * called by a name other than "ssh" or "Secure Shell".
11 * SSH2 support by Markus Friedl.
12 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 RCSID("$OpenBSD: session.c,v 1.158 2003/06/02 09:17:34 markus Exp $");
51 #include "auth-options.h"
52 #include "pathnames.h"
56 #include "serverloop.h"
59 #include "monitor_wrap.h"
63 #include <sys/cygwin.h>
64 #define is_winnt (GetVersion() < 0x80000000)
69 Session *session_new(void);
70 void session_set_fds(Session *, int, int, int);
71 void session_pty_cleanup(void *);
72 void session_proctitle(Session *);
73 int session_setup_x11fwd(Session *);
74 void do_exec_pty(Session *, const char *);
75 void do_exec_no_pty(Session *, const char *);
76 void do_exec(Session *, const char *);
77 void do_login(Session *, const char *);
78 #ifdef LOGIN_NEEDS_UTMPX
79 static void do_pre_login(Session *s);
81 void do_child(Session *, const char *);
83 int check_quietlogin(Session *, const char *);
85 static void do_authenticated1(Authctxt *);
86 static void do_authenticated2(Authctxt *);
88 static int session_pty_req(Session *);
91 extern ServerOptions options;
92 extern char *__progname;
93 extern int log_stderr;
94 extern int debug_flag;
95 extern u_int utmp_len;
96 extern int startup_pipe;
97 extern void destroy_sensitive_data(void);
99 /* original command from peer. */
100 const char *original_command = NULL;
103 #define MAX_SESSIONS 10
104 Session sessions[MAX_SESSIONS];
106 #ifdef WITH_AIXAUTHENTICATE
108 #endif /* WITH_AIXAUTHENTICATE */
110 #ifdef HAVE_LOGIN_CAP
114 /* Name and directory of socket for authentication agent forwarding. */
115 static char *auth_sock_name = NULL;
116 static char *auth_sock_dir = NULL;
118 /* removes the agent forwarding socket */
121 auth_sock_cleanup_proc(void *_pw)
123 struct passwd *pw = _pw;
125 if (auth_sock_name != NULL) {
126 temporarily_use_uid(pw);
127 unlink(auth_sock_name);
128 rmdir(auth_sock_dir);
129 auth_sock_name = NULL;
135 auth_input_request_forwarding(struct passwd * pw)
139 struct sockaddr_un sunaddr;
141 if (auth_sock_name != NULL) {
142 error("authentication forwarding requested twice.");
146 /* Temporarily drop privileged uid for mkdir/bind. */
147 temporarily_use_uid(pw);
149 /* Allocate a buffer for the socket name, and format the name. */
150 auth_sock_name = xmalloc(MAXPATHLEN);
151 auth_sock_dir = xmalloc(MAXPATHLEN);
152 strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
154 /* Create private directory for socket */
155 if (mkdtemp(auth_sock_dir) == NULL) {
156 packet_send_debug("Agent forwarding disabled: "
157 "mkdtemp() failed: %.100s", strerror(errno));
159 xfree(auth_sock_name);
160 xfree(auth_sock_dir);
161 auth_sock_name = NULL;
162 auth_sock_dir = NULL;
165 snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld",
166 auth_sock_dir, (long) getpid());
168 /* delete agent socket on fatal() */
169 fatal_add_cleanup(auth_sock_cleanup_proc, pw);
171 /* Create the socket. */
172 sock = socket(AF_UNIX, SOCK_STREAM, 0);
174 packet_disconnect("socket: %.100s", strerror(errno));
176 /* Bind it to the name. */
177 memset(&sunaddr, 0, sizeof(sunaddr));
178 sunaddr.sun_family = AF_UNIX;
179 strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
181 if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
182 packet_disconnect("bind: %.100s", strerror(errno));
184 /* Restore the privileged uid. */
187 /* Start listening on the socket. */
188 if (listen(sock, 5) < 0)
189 packet_disconnect("listen: %.100s", strerror(errno));
191 /* Allocate a channel for the authentication agent socket. */
192 nc = channel_new("auth socket",
193 SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
194 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
195 0, "auth socket", 1);
196 strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
202 do_authenticated(Authctxt *authctxt)
204 setproctitle("%s", authctxt->pw->pw_name);
207 * Cancel the alarm we set to limit the time taken for
211 if (startup_pipe != -1) {
216 /* setup the channel layer */
217 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
218 channel_permit_all_opens();
221 do_authenticated2(authctxt);
223 do_authenticated1(authctxt);
225 /* remove agent socket */
226 if (auth_sock_name != NULL)
227 auth_sock_cleanup_proc(authctxt->pw);
229 if (options.kerberos_ticket_cleanup)
230 krb4_cleanup_proc(authctxt);
233 if (options.kerberos_ticket_cleanup)
234 krb5_cleanup_proc(authctxt);
239 * Prepares for an interactive session. This is called after the user has
240 * been successfully authenticated. During this message exchange, pseudo
241 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
242 * are requested, etc.
245 do_authenticated1(Authctxt *authctxt)
249 int success, type, screen_flag;
250 int enable_compression_after_reply = 0;
251 u_int proto_len, data_len, dlen, compression_level = 0;
254 s->authctxt = authctxt;
255 s->pw = authctxt->pw;
258 * We stay in this loop until the client requests to execute a shell
264 /* Get a packet from the client. */
265 type = packet_read();
267 /* Process the packet. */
269 case SSH_CMSG_REQUEST_COMPRESSION:
270 compression_level = packet_get_int();
272 if (compression_level < 1 || compression_level > 9) {
273 packet_send_debug("Received illegal compression level %d.",
277 if (!options.compression) {
278 debug2("compression disabled");
281 /* Enable compression after we have responded with SUCCESS. */
282 enable_compression_after_reply = 1;
286 case SSH_CMSG_REQUEST_PTY:
287 success = session_pty_req(s);
290 case SSH_CMSG_X11_REQUEST_FORWARDING:
291 s->auth_proto = packet_get_string(&proto_len);
292 s->auth_data = packet_get_string(&data_len);
294 screen_flag = packet_get_protocol_flags() &
295 SSH_PROTOFLAG_SCREEN_NUMBER;
296 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
298 if (packet_remaining() == 4) {
300 debug2("Buggy client: "
301 "X11 screen flag missing");
302 s->screen = packet_get_int();
307 success = session_setup_x11fwd(s);
309 xfree(s->auth_proto);
311 s->auth_proto = NULL;
316 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
317 if (no_agent_forwarding_flag || compat13) {
318 debug("Authentication agent forwarding not permitted for this authentication.");
321 debug("Received authentication agent forwarding request.");
322 success = auth_input_request_forwarding(s->pw);
325 case SSH_CMSG_PORT_FORWARD_REQUEST:
326 if (no_port_forwarding_flag) {
327 debug("Port forwarding not permitted for this authentication.");
330 if (!options.allow_tcp_forwarding) {
331 debug("Port forwarding not permitted.");
334 debug("Received TCP/IP port forwarding request.");
335 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
339 case SSH_CMSG_MAX_PACKET_SIZE:
340 if (packet_set_maxsize(packet_get_int()) > 0)
344 #if defined(AFS) || defined(KRB5)
345 case SSH_CMSG_HAVE_KERBEROS_TGT:
346 if (!options.kerberos_tgt_passing) {
347 verbose("Kerberos TGT passing disabled.");
349 char *kdata = packet_get_string(&dlen);
352 /* XXX - 0x41, see creds_to_radix version */
353 if (kdata[0] != 0x41) {
359 if (auth_krb5_tgt(s->authctxt, &tgt))
362 verbose("Kerberos v5 TGT refused for %.100s", s->authctxt->user);
366 if (auth_krb4_tgt(s->authctxt, kdata))
369 verbose("Kerberos v4 TGT refused for %.100s", s->authctxt->user);
375 #endif /* AFS || KRB5 */
378 case SSH_CMSG_HAVE_AFS_TOKEN:
379 if (!options.afs_token_passing || !k_hasafs()) {
380 verbose("AFS token passing disabled.");
382 /* Accept AFS token. */
383 char *token = packet_get_string(&dlen);
386 if (auth_afs_token(s->authctxt, token))
389 verbose("AFS token refused for %.100s",
396 case SSH_CMSG_EXEC_SHELL:
397 case SSH_CMSG_EXEC_CMD:
398 if (type == SSH_CMSG_EXEC_CMD) {
399 command = packet_get_string(&dlen);
400 debug("Exec command '%.500s'", command);
412 * Any unknown messages in this phase are ignored,
413 * and a failure message is returned.
415 logit("Unknown packet type received after authentication: %d", type);
417 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
421 /* Enable compression now that we have replied if appropriate. */
422 if (enable_compression_after_reply) {
423 enable_compression_after_reply = 0;
424 packet_start_compression(compression_level);
430 * This is called to fork and execute a command when we have no tty. This
431 * will call do_child from the child, and server_loop from the parent after
432 * setting up file descriptors and such.
435 do_exec_no_pty(Session *s, const char *command)
440 int pin[2], pout[2], perr[2];
441 /* Allocate pipes for communicating with the program. */
442 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
443 packet_disconnect("Could not create pipes: %.100s",
445 #else /* USE_PIPES */
446 int inout[2], err[2];
447 /* Uses socket pairs to communicate with the program. */
448 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
449 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
450 packet_disconnect("Could not create socket pairs: %.100s",
452 #endif /* USE_PIPES */
454 fatal("do_exec_no_pty: no session");
456 session_proctitle(s);
459 if (options.use_pam) {
460 do_pam_session(s->pw->pw_name, NULL);
462 if (is_pam_password_change_required())
463 packet_disconnect("Password change required but no "
468 /* Fork the child. */
469 if ((pid = fork()) == 0) {
470 fatal_remove_all_cleanups();
472 /* Child. Reinitialize the log since the pid has changed. */
473 log_init(__progname, options.log_level, options.log_facility, log_stderr);
476 * Create a new session and process group since the 4.4BSD
477 * setlogin() affects the entire process group.
480 error("setsid failed: %.100s", strerror(errno));
484 * Redirect stdin. We close the parent side of the socket
485 * pair, and make the child side the standard input.
488 if (dup2(pin[0], 0) < 0)
489 perror("dup2 stdin");
492 /* Redirect stdout. */
494 if (dup2(pout[1], 1) < 0)
495 perror("dup2 stdout");
498 /* Redirect stderr. */
500 if (dup2(perr[1], 2) < 0)
501 perror("dup2 stderr");
503 #else /* USE_PIPES */
505 * Redirect stdin, stdout, and stderr. Stdin and stdout will
506 * use the same socket, as some programs (particularly rdist)
507 * seem to depend on it.
511 if (dup2(inout[0], 0) < 0) /* stdin */
512 perror("dup2 stdin");
513 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
514 perror("dup2 stdout");
515 if (dup2(err[0], 2) < 0) /* stderr */
516 perror("dup2 stderr");
517 #endif /* USE_PIPES */
520 cray_init_job(s->pw); /* set up cray jid and tmpdir */
523 /* Do processing for the child (exec command etc). */
524 do_child(s, command);
528 signal(WJSIGNAL, cray_job_termination_handler);
532 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
535 packet_disconnect("fork failed: %.100s", strerror(errno));
537 /* Set interactive/non-interactive mode. */
538 packet_set_interactive(s->display != NULL);
540 /* We are the parent. Close the child sides of the pipes. */
546 session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]);
548 /* Enter the interactive session. */
549 server_loop(pid, pin[1], pout[0], perr[0]);
550 /* server_loop has closed pin[1], pout[0], and perr[0]. */
552 #else /* USE_PIPES */
553 /* We are the parent. Close the child sides of the socket pairs. */
558 * Enter the interactive session. Note: server_loop must be able to
559 * handle the case that fdin and fdout are the same.
562 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
564 server_loop(pid, inout[1], inout[1], err[1]);
565 /* server_loop has closed inout[1] and err[1]. */
567 #endif /* USE_PIPES */
571 * This is called to fork and execute a command when we have a tty. This
572 * will call do_child from the child, and server_loop from the parent after
573 * setting up file descriptors, controlling tty, updating wtmp, utmp,
574 * lastlog, and other such operations.
577 do_exec_pty(Session *s, const char *command)
579 int fdout, ptyfd, ttyfd, ptymaster;
583 fatal("do_exec_pty: no session");
588 if (options.use_pam) {
589 do_pam_session(s->pw->pw_name, s->tty);
594 /* Fork the child. */
595 if ((pid = fork()) == 0) {
596 fatal_remove_all_cleanups();
598 /* Child. Reinitialize the log because the pid has changed. */
599 log_init(__progname, options.log_level, options.log_facility, log_stderr);
600 /* Close the master side of the pseudo tty. */
603 /* Make the pseudo tty our controlling tty. */
604 pty_make_controlling_tty(&ttyfd, s->tty);
606 /* Redirect stdin/stdout/stderr from the pseudo tty. */
607 if (dup2(ttyfd, 0) < 0)
608 error("dup2 stdin: %s", strerror(errno));
609 if (dup2(ttyfd, 1) < 0)
610 error("dup2 stdout: %s", strerror(errno));
611 if (dup2(ttyfd, 2) < 0)
612 error("dup2 stderr: %s", strerror(errno));
614 /* Close the extra descriptor for the pseudo tty. */
617 /* record login, etc. similar to login(1) */
619 if (!(options.use_login && command == NULL)) {
621 cray_init_job(s->pw); /* set up cray jid and tmpdir */
623 do_login(s, command);
625 # ifdef LOGIN_NEEDS_UTMPX
631 /* Do common processing for the child, such as execing the command. */
632 do_child(s, command);
636 signal(WJSIGNAL, cray_job_termination_handler);
640 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
643 packet_disconnect("fork failed: %.100s", strerror(errno));
646 /* Parent. Close the slave side of the pseudo tty. */
650 * Create another descriptor of the pty master side for use as the
651 * standard input. We could use the original descriptor, but this
652 * simplifies code in server_loop. The descriptor is bidirectional.
656 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
658 /* we keep a reference to the pty master */
659 ptymaster = dup(ptyfd);
661 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
662 s->ptymaster = ptymaster;
664 /* Enter interactive session. */
665 packet_set_interactive(1);
667 session_set_fds(s, ptyfd, fdout, -1);
669 server_loop(pid, ptyfd, fdout, -1);
670 /* server_loop _has_ closed ptyfd and fdout. */
674 #ifdef LOGIN_NEEDS_UTMPX
676 do_pre_login(Session *s)
679 struct sockaddr_storage from;
680 pid_t pid = getpid();
683 * Get IP address of client. If the connection is not a socket, let
684 * the address be 0.0.0.0.
686 memset(&from, 0, sizeof(from));
687 fromlen = sizeof(from);
688 if (packet_connection_is_on_socket()) {
689 if (getpeername(packet_get_connection_in(),
690 (struct sockaddr *) & from, &fromlen) < 0) {
691 debug("getpeername: %.100s", strerror(errno));
696 record_utmp_only(pid, s->tty, s->pw->pw_name,
697 get_remote_name_or_ip(utmp_len, options.use_dns),
698 (struct sockaddr *)&from, fromlen);
703 * This is called to fork and execute a command. If another command is
704 * to be forced, execute that instead.
707 do_exec(Session *s, const char *command)
709 if (forced_command) {
710 original_command = command;
711 command = forced_command;
712 debug("Forced command '%.900s'", command);
716 do_exec_pty(s, command);
718 do_exec_no_pty(s, command);
720 original_command = NULL;
724 /* administrative, login(1)-like work */
726 do_login(Session *s, const char *command)
730 struct sockaddr_storage from;
731 struct passwd * pw = s->pw;
732 pid_t pid = getpid();
735 * Get IP address of client. If the connection is not a socket, let
736 * the address be 0.0.0.0.
738 memset(&from, 0, sizeof(from));
739 fromlen = sizeof(from);
740 if (packet_connection_is_on_socket()) {
741 if (getpeername(packet_get_connection_in(),
742 (struct sockaddr *) & from, &fromlen) < 0) {
743 debug("getpeername: %.100s", strerror(errno));
748 /* Record that there was a login on that tty from the remote host. */
750 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
751 get_remote_name_or_ip(utmp_len,
753 (struct sockaddr *)&from, fromlen);
757 * If password change is needed, do it now.
758 * This needs to occur before the ~/.hushlogin check.
760 if (options.use_pam && is_pam_password_change_required()) {
761 print_pam_messages();
766 if (check_quietlogin(s, command))
770 if (options.use_pam && !is_pam_password_change_required())
771 print_pam_messages();
773 #ifdef WITH_AIXAUTHENTICATE
774 if (aixloginmsg && *aixloginmsg)
775 printf("%s\n", aixloginmsg);
776 #endif /* WITH_AIXAUTHENTICATE */
778 #ifndef NO_SSH_LASTLOG
779 if (options.print_lastlog && s->last_login_time != 0) {
780 time_string = ctime(&s->last_login_time);
781 if (strchr(time_string, '\n'))
782 *strchr(time_string, '\n') = 0;
783 if (strcmp(s->hostname, "") == 0)
784 printf("Last login: %s\r\n", time_string);
786 printf("Last login: %s from %s\r\n", time_string,
789 #endif /* NO_SSH_LASTLOG */
795 * Display the message of the day.
803 if (options.print_motd) {
804 #ifdef HAVE_LOGIN_CAP
805 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
808 f = fopen("/etc/motd", "r");
811 while (fgets(buf, sizeof(buf), f))
820 * Check for quiet login, either .hushlogin or command given.
823 check_quietlogin(Session *s, const char *command)
826 struct passwd *pw = s->pw;
829 /* Return 1 if .hushlogin exists or a command given. */
832 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
833 #ifdef HAVE_LOGIN_CAP
834 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
837 if (stat(buf, &st) >= 0)
844 * Sets the value of the given variable in the environment. If the variable
845 * already exists, its value is overriden.
848 child_set_env(char ***envp, u_int *envsizep, const char *name,
855 * Find the slot where the value should be stored. If the variable
856 * already exists, we reuse the slot; otherwise we append a new slot
857 * at the end of the array, expanding if necessary.
860 namelen = strlen(name);
861 for (i = 0; env[i]; i++)
862 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
865 /* Reuse the slot. */
868 /* New variable. Expand if necessary. */
869 if (i >= (*envsizep) - 1) {
870 if (*envsizep >= 1000)
871 fatal("child_set_env: too many env vars,"
872 " skipping: %.100s", name);
874 env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
876 /* Need to set the NULL pointer at end of array beyond the new slot. */
880 /* Allocate space and format the variable in the appropriate slot. */
881 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
882 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
886 * Reads environment variables from the given file and adds/overrides them
887 * into the environment. If the file does not exist, this does nothing.
888 * Otherwise, it must consist of empty lines, comments (line starts with '#')
889 * and assignments of the form name=value. No other forms are allowed.
892 read_environment_file(char ***env, u_int *envsize,
893 const char *filename)
900 f = fopen(filename, "r");
904 while (fgets(buf, sizeof(buf), f)) {
906 fatal("Too many lines in environment file %s", filename);
907 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
909 if (!*cp || *cp == '#' || *cp == '\n')
911 if (strchr(cp, '\n'))
912 *strchr(cp, '\n') = '\0';
913 value = strchr(cp, '=');
915 fprintf(stderr, "Bad line %u in %.100s\n", lineno,
920 * Replace the equals sign by nul, and advance value to
925 child_set_env(env, envsize, cp, value);
930 void copy_environment(char **source, char ***env, u_int *envsize)
932 char *var_name, *var_val;
938 for(i = 0; source[i] != NULL; i++) {
939 var_name = xstrdup(source[i]);
940 if ((var_val = strstr(var_name, "=")) == NULL) {
946 debug3("Copy environment: %s=%s", var_name, var_val);
947 child_set_env(env, envsize, var_name, var_val);
954 do_setup_env(Session *s, const char *shell)
959 struct passwd *pw = s->pw;
961 /* Initialize the environment. */
963 env = xmalloc(envsize * sizeof(char *));
968 * The Windows environment contains some setting which are
969 * important for a running system. They must not be dropped.
971 copy_environment(environ, &env, &envsize);
974 if (!options.use_login) {
975 /* Set basic environment. */
976 child_set_env(&env, &envsize, "USER", pw->pw_name);
977 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
979 child_set_env(&env, &envsize, "LOGIN", pw->pw_name);
981 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
982 #ifdef HAVE_LOGIN_CAP
983 if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
984 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
986 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
987 #else /* HAVE_LOGIN_CAP */
990 * There's no standard path on Windows. The path contains
991 * important components pointing to the system directories,
992 * needed for loading shared libraries. So the path better
993 * remains intact here.
995 # ifdef SUPERUSER_PATH
996 child_set_env(&env, &envsize, "PATH",
997 s->pw->pw_uid == 0 ? SUPERUSER_PATH : _PATH_STDPATH);
999 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1000 # endif /* SUPERUSER_PATH */
1001 # endif /* HAVE_CYGWIN */
1002 #endif /* HAVE_LOGIN_CAP */
1004 snprintf(buf, sizeof buf, "%.200s/%.50s",
1005 _PATH_MAILDIR, pw->pw_name);
1006 child_set_env(&env, &envsize, "MAIL", buf);
1008 /* Normal systems set SHELL by default. */
1009 child_set_env(&env, &envsize, "SHELL", shell);
1012 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1014 /* Set custom environment options from RSA authentication. */
1015 if (!options.use_login) {
1016 while (custom_environment) {
1017 struct envstring *ce = custom_environment;
1020 for (i = 0; str[i] != '=' && str[i]; i++)
1022 if (str[i] == '=') {
1024 child_set_env(&env, &envsize, str, str + i + 1);
1026 custom_environment = ce->next;
1032 /* SSH_CLIENT deprecated */
1033 snprintf(buf, sizeof buf, "%.50s %d %d",
1034 get_remote_ipaddr(), get_remote_port(), get_local_port());
1035 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1037 laddr = get_local_ipaddr(packet_get_connection_in());
1038 snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1039 get_remote_ipaddr(), get_remote_port(), laddr, get_local_port());
1041 child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1044 child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1046 child_set_env(&env, &envsize, "TERM", s->term);
1048 child_set_env(&env, &envsize, "DISPLAY", s->display);
1049 if (original_command)
1050 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1054 if (cray_tmpdir[0] != '\0')
1055 child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir);
1056 #endif /* _UNICOS */
1062 if ((cp = getenv("AUTHSTATE")) != NULL)
1063 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1064 if ((cp = getenv("KRB5CCNAME")) != NULL)
1065 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1066 read_environment_file(&env, &envsize, "/etc/environment");
1070 if (s->authctxt->krb4_ticket_file)
1071 child_set_env(&env, &envsize, "KRBTKFILE",
1072 s->authctxt->krb4_ticket_file);
1075 if (s->authctxt->krb5_ticket_file)
1076 child_set_env(&env, &envsize, "KRB5CCNAME",
1077 s->authctxt->krb5_ticket_file);
1081 * Pull in any environment variables that may have
1084 if (options.use_pam) {
1085 char **p = fetch_pam_environment();
1087 copy_environment(p, &env, &envsize);
1088 free_pam_environment(p);
1090 #endif /* USE_PAM */
1092 if (auth_sock_name != NULL)
1093 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1096 /* read $HOME/.ssh/environment. */
1097 if (options.permit_user_env && !options.use_login) {
1098 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1099 strcmp(pw->pw_dir, "/") ? pw->pw_dir : "");
1100 read_environment_file(&env, &envsize, buf);
1103 /* dump the environment */
1104 fprintf(stderr, "Environment:\n");
1105 for (i = 0; env[i]; i++)
1106 fprintf(stderr, " %.200s\n", env[i]);
1112 * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
1113 * first in this order).
1116 do_rc_files(Session *s, const char *shell)
1124 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
1126 /* ignore _PATH_SSH_USER_RC for subsystems */
1127 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
1128 snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
1129 shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
1131 fprintf(stderr, "Running %s\n", cmd);
1132 f = popen(cmd, "w");
1135 fprintf(f, "%s %s\n", s->auth_proto,
1139 fprintf(stderr, "Could not run %s\n",
1141 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
1143 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
1144 _PATH_SSH_SYSTEM_RC);
1145 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
1148 fprintf(f, "%s %s\n", s->auth_proto,
1152 fprintf(stderr, "Could not run %s\n",
1153 _PATH_SSH_SYSTEM_RC);
1154 } else if (do_xauth && options.xauth_location != NULL) {
1155 /* Add authority data to .Xauthority if appropriate. */
1158 "Running %.500s remove %.100s\n",
1159 options.xauth_location, s->auth_display);
1161 "%.500s add %.100s %.100s %.100s\n",
1162 options.xauth_location, s->auth_display,
1163 s->auth_proto, s->auth_data);
1165 snprintf(cmd, sizeof cmd, "%s -q -",
1166 options.xauth_location);
1167 f = popen(cmd, "w");
1169 fprintf(f, "remove %s\n",
1171 fprintf(f, "add %s %s %s\n",
1172 s->auth_display, s->auth_proto,
1176 fprintf(stderr, "Could not run %s\n",
1183 do_nologin(struct passwd *pw)
1188 #ifdef HAVE_LOGIN_CAP
1189 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1190 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1191 _PATH_NOLOGIN), "r");
1194 f = fopen(_PATH_NOLOGIN, "r");
1197 /* /etc/nologin exists. Print its contents and exit. */
1198 logit("User %.100s not allowed because %s exists",
1199 pw->pw_name, _PATH_NOLOGIN);
1200 while (fgets(buf, sizeof(buf), f))
1208 /* Set login name, uid, gid, and groups. */
1210 do_setusercontext(struct passwd *pw)
1213 if (getuid() == 0 || geteuid() == 0)
1214 #endif /* HAVE_CYGWIN */
1217 #ifdef HAVE_SETPCRED
1218 setpcred(pw->pw_name, (char **)NULL);
1219 #endif /* HAVE_SETPCRED */
1220 #ifdef HAVE_LOGIN_CAP
1224 if (setusercontext(lc, pw, pw->pw_uid,
1225 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1226 perror("unable to set user context");
1230 # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
1231 /* Sets login uid for accounting */
1232 if (getluid() == -1 && setluid(pw->pw_uid) == -1)
1233 error("setluid: %s", strerror(errno));
1234 # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
1236 if (setlogin(pw->pw_name) < 0)
1237 error("setlogin failed: %s", strerror(errno));
1238 if (setgid(pw->pw_gid) < 0) {
1242 /* Initialize the group list. */
1243 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1244 perror("initgroups");
1250 * PAM credentials may take the form of supplementary groups.
1251 * These will have been wiped by the above initgroups() call.
1252 * Reestablish them here.
1254 if (options.use_pam)
1256 # endif /* USE_PAM */
1257 # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
1258 irix_setusercontext(pw);
1259 # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
1263 /* Permanently switch to the desired uid. */
1264 permanently_set_uid(pw);
1271 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1272 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1276 launch_login(struct passwd *pw, const char *hostname)
1278 /* Launch login(1). */
1280 execl(LOGIN_PROGRAM, "login", "-h", hostname,
1281 #ifdef xxxLOGIN_NEEDS_TERM
1282 (s->term ? s->term : "unknown"),
1283 #endif /* LOGIN_NEEDS_TERM */
1284 #ifdef LOGIN_NO_ENDOPT
1285 "-p", "-f", pw->pw_name, (char *)NULL);
1287 "-p", "-f", "--", pw->pw_name, (char *)NULL);
1290 /* Login couldn't be executed, die. */
1297 * Performs common processing for the child, such as setting up the
1298 * environment, closing extra file descriptors, setting the user and group
1299 * ids, and executing the command or shell.
1302 do_child(Session *s, const char *command)
1304 extern char **environ;
1307 const char *shell, *shell0, *hostname = NULL;
1308 struct passwd *pw = s->pw;
1311 /* remove hostkey from the child's memory */
1312 destroy_sensitive_data();
1314 /* login(1) is only called if we execute the login shell */
1315 if (options.use_login && command != NULL)
1316 options.use_login = 0;
1319 cray_setup(pw->pw_uid, pw->pw_name, command);
1320 #endif /* _UNICOS */
1323 * Login(1) does this as well, and it needs uid 0 for the "-h"
1324 * switch, so we let login(1) to this for us.
1326 if (!options.use_login) {
1328 session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty);
1329 if (!check_quietlogin(s, command))
1331 #else /* HAVE_OSF_SIA */
1333 do_setusercontext(pw);
1334 #endif /* HAVE_OSF_SIA */
1338 * Get the shell from the password data. An empty shell field is
1339 * legal, and means /bin/sh.
1341 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1344 * Make sure $SHELL points to the shell from the password file,
1345 * even if shell is overridden from login.conf
1347 env = do_setup_env(s, shell);
1349 #ifdef HAVE_LOGIN_CAP
1350 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1353 /* we have to stash the hostname before we close our socket. */
1354 if (options.use_login)
1355 hostname = get_remote_name_or_ip(utmp_len,
1358 * Close the connection descriptors; note that this is the child, and
1359 * the server will still have the socket open, and it is important
1360 * that we do not shutdown it. Note that the descriptors cannot be
1361 * closed before building the environment, as we call
1362 * get_remote_ipaddr there.
1364 if (packet_get_connection_in() == packet_get_connection_out())
1365 close(packet_get_connection_in());
1367 close(packet_get_connection_in());
1368 close(packet_get_connection_out());
1371 * Close all descriptors related to channels. They will still remain
1372 * open in the parent.
1374 /* XXX better use close-on-exec? -markus */
1375 channel_close_all();
1378 * Close any extra file descriptors. Note that there may still be
1379 * descriptors left by system functions. They will be closed later.
1384 * Close any extra open file descriptors so that we don\'t have them
1385 * hanging around in clients. Note that we want to do this after
1386 * initgroups, because at least on Solaris 2.3 it leaves file
1389 for (i = 3; i < 64; i++)
1393 * Must take new environment into use so that .ssh/rc,
1394 * /etc/ssh/sshrc and xauth are run in the proper environment.
1399 /* Try to get AFS tokens for the local cell. */
1403 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1404 krb_afslog(cell, 0);
1410 /* Change current directory to the user\'s home directory. */
1411 if (chdir(pw->pw_dir) < 0) {
1412 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1413 pw->pw_dir, strerror(errno));
1414 #ifdef HAVE_LOGIN_CAP
1415 if (login_getcapbool(lc, "requirehome", 0))
1420 if (!options.use_login)
1421 do_rc_files(s, shell);
1423 /* restore SIGPIPE for child */
1424 signal(SIGPIPE, SIG_DFL);
1426 if (options.use_login) {
1427 launch_login(pw, hostname);
1431 /* Get the last component of the shell name. */
1432 if ((shell0 = strrchr(shell, '/')) != NULL)
1438 * If we have no command, execute the shell. In this case, the shell
1439 * name to be passed in argv[0] is preceded by '-' to indicate that
1440 * this is a login shell.
1445 /* Start the shell. Set initial character to '-'. */
1448 if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1449 >= sizeof(argv0) - 1) {
1455 /* Execute the shell. */
1458 execve(shell, argv, env);
1460 /* Executing the shell failed. */
1465 * Execute the command using the user's shell. This uses the -c
1466 * option to execute the command.
1468 argv[0] = (char *) shell0;
1470 argv[2] = (char *) command;
1472 execve(shell, argv, env);
1481 static int did_init = 0;
1483 debug("session_new: init");
1484 for (i = 0; i < MAX_SESSIONS; i++) {
1485 sessions[i].used = 0;
1489 for (i = 0; i < MAX_SESSIONS; i++) {
1490 Session *s = &sessions[i];
1492 memset(s, 0, sizeof(*s));
1498 debug("session_new: session %d", i);
1509 for (i = 0; i < MAX_SESSIONS; i++) {
1510 Session *s = &sessions[i];
1511 debug("dump: used %d session %d %p channel %d pid %ld",
1521 session_open(Authctxt *authctxt, int chanid)
1523 Session *s = session_new();
1524 debug("session_open: channel %d", chanid);
1526 error("no more sessions");
1529 s->authctxt = authctxt;
1530 s->pw = authctxt->pw;
1532 fatal("no user for session %d", s->self);
1533 debug("session_open: session %d: link with channel %d", s->self, chanid);
1539 session_by_tty(char *tty)
1542 for (i = 0; i < MAX_SESSIONS; i++) {
1543 Session *s = &sessions[i];
1544 if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1545 debug("session_by_tty: session %d tty %s", i, tty);
1549 debug("session_by_tty: unknown tty %.100s", tty);
1555 session_by_channel(int id)
1558 for (i = 0; i < MAX_SESSIONS; i++) {
1559 Session *s = &sessions[i];
1560 if (s->used && s->chanid == id) {
1561 debug("session_by_channel: session %d channel %d", i, id);
1565 debug("session_by_channel: unknown channel %d", id);
1571 session_by_pid(pid_t pid)
1574 debug("session_by_pid: pid %ld", (long)pid);
1575 for (i = 0; i < MAX_SESSIONS; i++) {
1576 Session *s = &sessions[i];
1577 if (s->used && s->pid == pid)
1580 error("session_by_pid: unknown pid %ld", (long)pid);
1586 session_window_change_req(Session *s)
1588 s->col = packet_get_int();
1589 s->row = packet_get_int();
1590 s->xpixel = packet_get_int();
1591 s->ypixel = packet_get_int();
1593 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1598 session_pty_req(Session *s)
1604 debug("Allocating a pty not permitted for this authentication.");
1607 if (s->ttyfd != -1) {
1608 packet_disconnect("Protocol error: you already have a pty.");
1611 /* Get the time and hostname when the user last logged in. */
1612 if (options.print_lastlog) {
1613 s->hostname[0] = '\0';
1614 s->last_login_time = get_last_login_time(s->pw->pw_uid,
1615 s->pw->pw_name, s->hostname, sizeof(s->hostname));
1618 s->term = packet_get_string(&len);
1621 s->col = packet_get_int();
1622 s->row = packet_get_int();
1624 s->row = packet_get_int();
1625 s->col = packet_get_int();
1627 s->xpixel = packet_get_int();
1628 s->ypixel = packet_get_int();
1630 if (strcmp(s->term, "") == 0) {
1635 /* Allocate a pty and open it. */
1636 debug("Allocating pty.");
1637 if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
1643 error("session_pty_req: session %d alloc failed", s->self);
1646 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1648 /* for SSH1 the tty modes length is not given */
1650 n_bytes = packet_remaining();
1651 tty_parse_modes(s->ttyfd, &n_bytes);
1654 * Add a cleanup function to clear the utmp entry and record logout
1655 * time in case we call fatal() (e.g., the connection gets closed).
1657 fatal_add_cleanup(session_pty_cleanup, (void *)s);
1659 pty_setowner(s->pw, s->tty);
1661 /* Set window size from the packet. */
1662 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1665 session_proctitle(s);
1670 session_subsystem_req(Session *s)
1675 char *cmd, *subsys = packet_get_string(&len);
1679 logit("subsystem request for %.100s", subsys);
1681 for (i = 0; i < options.num_subsystems; i++) {
1682 if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1683 cmd = options.subsystem_command[i];
1684 if (stat(cmd, &st) < 0) {
1685 error("subsystem: cannot stat %s: %s", cmd,
1689 debug("subsystem: exec() %s", cmd);
1690 s->is_subsystem = 1;
1698 logit("subsystem request for %.100s failed, subsystem not found",
1706 session_x11_req(Session *s)
1710 s->single_connection = packet_get_char();
1711 s->auth_proto = packet_get_string(NULL);
1712 s->auth_data = packet_get_string(NULL);
1713 s->screen = packet_get_int();
1716 success = session_setup_x11fwd(s);
1718 xfree(s->auth_proto);
1719 xfree(s->auth_data);
1720 s->auth_proto = NULL;
1721 s->auth_data = NULL;
1727 session_shell_req(Session *s)
1735 session_exec_req(Session *s)
1738 char *command = packet_get_string(&len);
1740 do_exec(s, command);
1746 session_break_req(Session *s)
1750 break_length = packet_get_int();
1755 /* we will sleep from 500ms to 3000ms */
1756 break_length = MIN(break_length, 3000);
1757 break_length = MAX(break_length, 500);
1758 ioctl(s->ttyfd, TIOCSBRK, NULL);
1759 /* should we care about EINTR? */
1760 usleep(break_length * 1000);
1761 ioctl(s->ttyfd, TIOCCBRK, NULL);
1766 session_auth_agent_req(Session *s)
1768 static int called = 0;
1770 if (no_agent_forwarding_flag) {
1771 debug("session_auth_agent_req: no_agent_forwarding_flag");
1778 return auth_input_request_forwarding(s->pw);
1783 session_input_channel_req(Channel *c, const char *rtype)
1788 if ((s = session_by_channel(c->self)) == NULL) {
1789 logit("session_input_channel_req: no session %d req %.100s",
1793 debug("session_input_channel_req: session %d req %s", s->self, rtype);
1796 * a session is in LARVAL state until a shell, a command
1797 * or a subsystem is executed
1799 if (c->type == SSH_CHANNEL_LARVAL) {
1800 if (strcmp(rtype, "shell") == 0) {
1801 success = session_shell_req(s);
1802 } else if (strcmp(rtype, "exec") == 0) {
1803 success = session_exec_req(s);
1804 } else if (strcmp(rtype, "pty-req") == 0) {
1805 success = session_pty_req(s);
1806 } else if (strcmp(rtype, "x11-req") == 0) {
1807 success = session_x11_req(s);
1808 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1809 success = session_auth_agent_req(s);
1810 } else if (strcmp(rtype, "subsystem") == 0) {
1811 success = session_subsystem_req(s);
1812 } else if (strcmp(rtype, "break") == 0) {
1813 success = session_break_req(s);
1816 if (strcmp(rtype, "window-change") == 0) {
1817 success = session_window_change_req(s);
1823 session_set_fds(Session *s, int fdin, int fdout, int fderr)
1826 fatal("session_set_fds: called for proto != 2.0");
1828 * now that have a child and a pipe to the child,
1829 * we can activate our channel and register the fd's
1831 if (s->chanid == -1)
1832 fatal("no channel for session %d", s->self);
1833 channel_set_fds(s->chanid,
1835 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1837 CHAN_SES_WINDOW_DEFAULT);
1841 * Function to perform pty cleanup. Also called if we get aborted abnormally
1842 * (e.g., due to a dropped connection).
1845 session_pty_cleanup2(void *session)
1847 Session *s = session;
1850 error("session_pty_cleanup: no session");
1856 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1858 /* Record that the user has logged out. */
1860 record_logout(s->pid, s->tty, s->pw->pw_name);
1862 /* Release the pseudo-tty. */
1864 pty_release(s->tty);
1867 * Close the server side of the socket pairs. We must do this after
1868 * the pty cleanup, so that another process doesn't get this pty
1869 * while we're still cleaning up.
1871 if (close(s->ptymaster) < 0)
1872 error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
1874 /* unlink pty from session */
1879 session_pty_cleanup(void *session)
1881 PRIVSEP(session_pty_cleanup2(session));
1887 #define SSH_SIG(x) if (sig == SIG ## x) return #x
1902 return "SIG@openssh.com";
1906 session_exit_message(Session *s, int status)
1910 if ((c = channel_lookup(s->chanid)) == NULL)
1911 fatal("session_exit_message: session %d: no channel %d",
1912 s->self, s->chanid);
1913 debug("session_exit_message: session %d channel %d pid %ld",
1914 s->self, s->chanid, (long)s->pid);
1916 if (WIFEXITED(status)) {
1917 channel_request_start(s->chanid, "exit-status", 0);
1918 packet_put_int(WEXITSTATUS(status));
1920 } else if (WIFSIGNALED(status)) {
1921 channel_request_start(s->chanid, "exit-signal", 0);
1922 packet_put_cstring(sig2name(WTERMSIG(status)));
1924 packet_put_char(WCOREDUMP(status));
1925 #else /* WCOREDUMP */
1927 #endif /* WCOREDUMP */
1928 packet_put_cstring("");
1929 packet_put_cstring("");
1932 /* Some weird exit cause. Just exit. */
1933 packet_disconnect("wait returned status %04x.", status);
1936 /* disconnect channel */
1937 debug("session_exit_message: release channel %d", s->chanid);
1938 channel_cancel_cleanup(s->chanid);
1940 * emulate a write failure with 'chan_write_failed', nobody will be
1941 * interested in data we write.
1942 * Note that we must not call 'chan_read_failed', since there could
1943 * be some more data waiting in the pipe.
1945 if (c->ostate != CHAN_OUTPUT_CLOSED)
1946 chan_write_failed(c);
1951 session_close(Session *s)
1953 debug("session_close: session %d pid %ld", s->self, (long)s->pid);
1954 if (s->ttyfd != -1) {
1955 fatal_remove_cleanup(session_pty_cleanup, (void *)s);
1956 session_pty_cleanup(s);
1962 if (s->auth_display)
1963 xfree(s->auth_display);
1965 xfree(s->auth_data);
1967 xfree(s->auth_proto);
1969 session_proctitle(s);
1973 session_close_by_pid(pid_t pid, int status)
1975 Session *s = session_by_pid(pid);
1977 debug("session_close_by_pid: no session for pid %ld",
1981 if (s->chanid != -1)
1982 session_exit_message(s, status);
1987 * this is called when a channel dies before
1988 * the session 'child' itself dies
1991 session_close_by_channel(int id, void *arg)
1993 Session *s = session_by_channel(id);
1995 debug("session_close_by_channel: no session for id %d", id);
1998 debug("session_close_by_channel: channel %d child %ld",
2001 debug("session_close_by_channel: channel %d: has child", id);
2003 * delay detach of session, but release pty, since
2004 * the fd's to the child are already closed
2006 if (s->ttyfd != -1) {
2007 fatal_remove_cleanup(session_pty_cleanup, (void *)s);
2008 session_pty_cleanup(s);
2012 /* detach by removing callback */
2013 channel_cancel_cleanup(s->chanid);
2019 session_destroy_all(void (*closefunc)(Session *))
2022 for (i = 0; i < MAX_SESSIONS; i++) {
2023 Session *s = &sessions[i];
2025 if (closefunc != NULL)
2034 session_tty_list(void)
2036 static char buf[1024];
2041 for (i = 0; i < MAX_SESSIONS; i++) {
2042 Session *s = &sessions[i];
2043 if (s->used && s->ttyfd != -1) {
2045 if (strncmp(s->tty, "/dev/", 5) != 0) {
2046 cp = strrchr(s->tty, '/');
2047 cp = (cp == NULL) ? s->tty : cp + 1;
2052 strlcat(buf, ",", sizeof buf);
2053 strlcat(buf, cp, sizeof buf);
2057 strlcpy(buf, "notty", sizeof buf);
2062 session_proctitle(Session *s)
2065 error("no user for session %d", s->self);
2067 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
2071 session_setup_x11fwd(Session *s)
2074 char display[512], auth_display[512];
2075 char hostname[MAXHOSTNAMELEN];
2077 if (no_x11_forwarding_flag) {
2078 packet_send_debug("X11 forwarding disabled in user configuration file.");
2081 if (!options.x11_forwarding) {
2082 debug("X11 forwarding disabled in server configuration file.");
2085 if (!options.xauth_location ||
2086 (stat(options.xauth_location, &st) == -1)) {
2087 packet_send_debug("No xauth program; cannot forward with spoofing.");
2090 if (options.use_login) {
2091 packet_send_debug("X11 forwarding disabled; "
2092 "not compatible with UseLogin=yes.");
2095 if (s->display != NULL) {
2096 debug("X11 display already set.");
2099 if (x11_create_display_inet(options.x11_display_offset,
2100 options.x11_use_localhost, s->single_connection,
2101 &s->display_number) == -1) {
2102 debug("x11_create_display_inet failed.");
2106 /* Set up a suitable value for the DISPLAY variable. */
2107 if (gethostname(hostname, sizeof(hostname)) < 0)
2108 fatal("gethostname: %.100s", strerror(errno));
2110 * auth_display must be used as the displayname when the
2111 * authorization entry is added with xauth(1). This will be
2112 * different than the DISPLAY string for localhost displays.
2114 if (options.x11_use_localhost) {
2115 snprintf(display, sizeof display, "localhost:%u.%u",
2116 s->display_number, s->screen);
2117 snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
2118 s->display_number, s->screen);
2119 s->display = xstrdup(display);
2120 s->auth_display = xstrdup(auth_display);
2122 #ifdef IPADDR_IN_DISPLAY
2124 struct in_addr my_addr;
2126 he = gethostbyname(hostname);
2128 error("Can't get IP address for X11 DISPLAY.");
2129 packet_send_debug("Can't get IP address for X11 DISPLAY.");
2132 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
2133 snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr),
2134 s->display_number, s->screen);
2136 snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
2137 s->display_number, s->screen);
2139 s->display = xstrdup(display);
2140 s->auth_display = xstrdup(display);
2147 do_authenticated2(Authctxt *authctxt)
2149 server_loop2(authctxt);