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 1.161 2003/08/22 10:56:09 markus Exp $");
51 #include "auth-options.h"
52 #include "pathnames.h"
56 #include "serverloop.h"
59 #include "monitor_wrap.h"
67 Session *session_new(void);
68 void session_set_fds(Session *, int, int, int);
69 void session_pty_cleanup(void *);
70 void session_proctitle(Session *);
71 int session_setup_x11fwd(Session *);
72 void do_exec_pty(Session *, const char *);
73 void do_exec_no_pty(Session *, const char *);
74 void do_exec(Session *, const char *);
75 void do_login(Session *, const char *);
76 #ifdef LOGIN_NEEDS_UTMPX
77 static void do_pre_login(Session *s);
79 void do_child(Session *, const char *);
81 int check_quietlogin(Session *, const char *);
83 static void do_authenticated1(Authctxt *);
84 static void do_authenticated2(Authctxt *);
86 static int session_pty_req(Session *);
89 extern ServerOptions options;
90 extern char *__progname;
91 extern int log_stderr;
92 extern int debug_flag;
93 extern u_int utmp_len;
94 extern int startup_pipe;
95 extern void destroy_sensitive_data(void);
96 extern Buffer loginmsg;
98 /* original command from peer. */
99 const char *original_command = NULL;
102 #define MAX_SESSIONS 10
103 Session sessions[MAX_SESSIONS];
105 #ifdef HAVE_LOGIN_CAP
109 /* Name and directory of socket for authentication agent forwarding. */
110 static char *auth_sock_name = NULL;
111 static char *auth_sock_dir = NULL;
113 /* removes the agent forwarding socket */
116 auth_sock_cleanup_proc(void *_pw)
118 struct passwd *pw = _pw;
120 if (auth_sock_name != NULL) {
121 temporarily_use_uid(pw);
122 unlink(auth_sock_name);
123 rmdir(auth_sock_dir);
124 auth_sock_name = NULL;
130 auth_input_request_forwarding(struct passwd * pw)
134 struct sockaddr_un sunaddr;
136 if (auth_sock_name != NULL) {
137 error("authentication forwarding requested twice.");
141 /* Temporarily drop privileged uid for mkdir/bind. */
142 temporarily_use_uid(pw);
144 /* Allocate a buffer for the socket name, and format the name. */
145 auth_sock_name = xmalloc(MAXPATHLEN);
146 auth_sock_dir = xmalloc(MAXPATHLEN);
147 strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
149 /* Create private directory for socket */
150 if (mkdtemp(auth_sock_dir) == NULL) {
151 packet_send_debug("Agent forwarding disabled: "
152 "mkdtemp() failed: %.100s", strerror(errno));
154 xfree(auth_sock_name);
155 xfree(auth_sock_dir);
156 auth_sock_name = NULL;
157 auth_sock_dir = NULL;
160 snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld",
161 auth_sock_dir, (long) getpid());
163 /* delete agent socket on fatal() */
164 fatal_add_cleanup(auth_sock_cleanup_proc, pw);
166 /* Create the socket. */
167 sock = socket(AF_UNIX, SOCK_STREAM, 0);
169 packet_disconnect("socket: %.100s", strerror(errno));
171 /* Bind it to the name. */
172 memset(&sunaddr, 0, sizeof(sunaddr));
173 sunaddr.sun_family = AF_UNIX;
174 strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
176 if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
177 packet_disconnect("bind: %.100s", strerror(errno));
179 /* Restore the privileged uid. */
182 /* Start listening on the socket. */
183 if (listen(sock, 5) < 0)
184 packet_disconnect("listen: %.100s", strerror(errno));
186 /* Allocate a channel for the authentication agent socket. */
187 nc = channel_new("auth socket",
188 SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
189 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
190 0, "auth socket", 1);
191 strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
197 do_authenticated(Authctxt *authctxt)
199 setproctitle("%s", authctxt->pw->pw_name);
202 * Cancel the alarm we set to limit the time taken for
206 if (startup_pipe != -1) {
211 /* setup the channel layer */
212 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
213 channel_permit_all_opens();
216 do_authenticated2(authctxt);
218 do_authenticated1(authctxt);
220 /* remove agent socket */
221 if (auth_sock_name != NULL)
222 auth_sock_cleanup_proc(authctxt->pw);
224 if (options.kerberos_ticket_cleanup)
225 krb5_cleanup_proc(authctxt);
230 * Prepares for an interactive session. This is called after the user has
231 * been successfully authenticated. During this message exchange, pseudo
232 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
233 * are requested, etc.
236 do_authenticated1(Authctxt *authctxt)
240 int success, type, screen_flag;
241 int enable_compression_after_reply = 0;
242 u_int proto_len, data_len, dlen, compression_level = 0;
245 s->authctxt = authctxt;
246 s->pw = authctxt->pw;
249 * We stay in this loop until the client requests to execute a shell
255 /* Get a packet from the client. */
256 type = packet_read();
258 /* Process the packet. */
260 case SSH_CMSG_REQUEST_COMPRESSION:
261 compression_level = packet_get_int();
263 if (compression_level < 1 || compression_level > 9) {
264 packet_send_debug("Received illegal compression level %d.",
268 if (!options.compression) {
269 debug2("compression disabled");
272 /* Enable compression after we have responded with SUCCESS. */
273 enable_compression_after_reply = 1;
277 case SSH_CMSG_REQUEST_PTY:
278 success = session_pty_req(s);
281 case SSH_CMSG_X11_REQUEST_FORWARDING:
282 s->auth_proto = packet_get_string(&proto_len);
283 s->auth_data = packet_get_string(&data_len);
285 screen_flag = packet_get_protocol_flags() &
286 SSH_PROTOFLAG_SCREEN_NUMBER;
287 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
289 if (packet_remaining() == 4) {
291 debug2("Buggy client: "
292 "X11 screen flag missing");
293 s->screen = packet_get_int();
298 success = session_setup_x11fwd(s);
300 xfree(s->auth_proto);
302 s->auth_proto = NULL;
307 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
308 if (no_agent_forwarding_flag || compat13) {
309 debug("Authentication agent forwarding not permitted for this authentication.");
312 debug("Received authentication agent forwarding request.");
313 success = auth_input_request_forwarding(s->pw);
316 case SSH_CMSG_PORT_FORWARD_REQUEST:
317 if (no_port_forwarding_flag) {
318 debug("Port forwarding not permitted for this authentication.");
321 if (!options.allow_tcp_forwarding) {
322 debug("Port forwarding not permitted.");
325 debug("Received TCP/IP port forwarding request.");
326 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
330 case SSH_CMSG_MAX_PACKET_SIZE:
331 if (packet_set_maxsize(packet_get_int()) > 0)
336 case SSH_CMSG_HAVE_KERBEROS_TGT:
337 if (!options.kerberos_tgt_passing) {
338 verbose("Kerberos TGT passing disabled.");
340 char *kdata = packet_get_string(&dlen);
343 /* XXX - 0x41, used for AFS */
344 if (kdata[0] != 0x41) {
349 if (auth_krb5_tgt(s->authctxt, &tgt))
352 verbose("Kerberos v5 TGT refused for %.100s", s->authctxt->user);
359 case SSH_CMSG_EXEC_SHELL:
360 case SSH_CMSG_EXEC_CMD:
361 if (type == SSH_CMSG_EXEC_CMD) {
362 command = packet_get_string(&dlen);
363 debug("Exec command '%.500s'", command);
375 * Any unknown messages in this phase are ignored,
376 * and a failure message is returned.
378 logit("Unknown packet type received after authentication: %d", type);
380 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
384 /* Enable compression now that we have replied if appropriate. */
385 if (enable_compression_after_reply) {
386 enable_compression_after_reply = 0;
387 packet_start_compression(compression_level);
393 * This is called to fork and execute a command when we have no tty. This
394 * will call do_child from the child, and server_loop from the parent after
395 * setting up file descriptors and such.
398 do_exec_no_pty(Session *s, const char *command)
403 int pin[2], pout[2], perr[2];
404 /* Allocate pipes for communicating with the program. */
405 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
406 packet_disconnect("Could not create pipes: %.100s",
408 #else /* USE_PIPES */
409 int inout[2], err[2];
410 /* Uses socket pairs to communicate with the program. */
411 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
412 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
413 packet_disconnect("Could not create socket pairs: %.100s",
415 #endif /* USE_PIPES */
417 fatal("do_exec_no_pty: no session");
419 session_proctitle(s);
422 if (options.use_pam) {
423 do_pam_session(s->pw->pw_name, NULL);
425 if (is_pam_password_change_required())
426 packet_disconnect("Password change required but no "
432 temporarily_use_uid(s->pw);
433 ssh_gssapi_storecreds();
437 /* Fork the child. */
438 if ((pid = fork()) == 0) {
439 fatal_remove_all_cleanups();
441 /* Child. Reinitialize the log since the pid has changed. */
442 log_init(__progname, options.log_level, options.log_facility, log_stderr);
445 * Create a new session and process group since the 4.4BSD
446 * setlogin() affects the entire process group.
449 error("setsid failed: %.100s", strerror(errno));
453 * Redirect stdin. We close the parent side of the socket
454 * pair, and make the child side the standard input.
457 if (dup2(pin[0], 0) < 0)
458 perror("dup2 stdin");
461 /* Redirect stdout. */
463 if (dup2(pout[1], 1) < 0)
464 perror("dup2 stdout");
467 /* Redirect stderr. */
469 if (dup2(perr[1], 2) < 0)
470 perror("dup2 stderr");
472 #else /* USE_PIPES */
474 * Redirect stdin, stdout, and stderr. Stdin and stdout will
475 * use the same socket, as some programs (particularly rdist)
476 * seem to depend on it.
480 if (dup2(inout[0], 0) < 0) /* stdin */
481 perror("dup2 stdin");
482 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
483 perror("dup2 stdout");
484 if (dup2(err[0], 2) < 0) /* stderr */
485 perror("dup2 stderr");
486 #endif /* USE_PIPES */
489 cray_init_job(s->pw); /* set up cray jid and tmpdir */
492 /* Do processing for the child (exec command etc). */
493 do_child(s, command);
497 signal(WJSIGNAL, cray_job_termination_handler);
501 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
504 packet_disconnect("fork failed: %.100s", strerror(errno));
506 /* Set interactive/non-interactive mode. */
507 packet_set_interactive(s->display != NULL);
509 /* We are the parent. Close the child sides of the pipes. */
515 session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]);
517 /* Enter the interactive session. */
518 server_loop(pid, pin[1], pout[0], perr[0]);
519 /* server_loop has closed pin[1], pout[0], and perr[0]. */
521 #else /* USE_PIPES */
522 /* We are the parent. Close the child sides of the socket pairs. */
527 * Enter the interactive session. Note: server_loop must be able to
528 * handle the case that fdin and fdout are the same.
531 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
533 server_loop(pid, inout[1], inout[1], err[1]);
534 /* server_loop has closed inout[1] and err[1]. */
536 #endif /* USE_PIPES */
540 * This is called to fork and execute a command when we have a tty. This
541 * will call do_child from the child, and server_loop from the parent after
542 * setting up file descriptors, controlling tty, updating wtmp, utmp,
543 * lastlog, and other such operations.
546 do_exec_pty(Session *s, const char *command)
548 int fdout, ptyfd, ttyfd, ptymaster;
552 fatal("do_exec_pty: no session");
557 if (options.use_pam) {
558 do_pam_session(s->pw->pw_name, s->tty);
564 temporarily_use_uid(s->pw);
565 ssh_gssapi_storecreds();
569 /* Fork the child. */
570 if ((pid = fork()) == 0) {
571 fatal_remove_all_cleanups();
573 /* Child. Reinitialize the log because the pid has changed. */
574 log_init(__progname, options.log_level, options.log_facility, log_stderr);
575 /* Close the master side of the pseudo tty. */
578 /* Make the pseudo tty our controlling tty. */
579 pty_make_controlling_tty(&ttyfd, s->tty);
581 /* Redirect stdin/stdout/stderr from the pseudo tty. */
582 if (dup2(ttyfd, 0) < 0)
583 error("dup2 stdin: %s", strerror(errno));
584 if (dup2(ttyfd, 1) < 0)
585 error("dup2 stdout: %s", strerror(errno));
586 if (dup2(ttyfd, 2) < 0)
587 error("dup2 stderr: %s", strerror(errno));
589 /* Close the extra descriptor for the pseudo tty. */
592 /* record login, etc. similar to login(1) */
594 if (!(options.use_login && command == NULL)) {
596 cray_init_job(s->pw); /* set up cray jid and tmpdir */
598 do_login(s, command);
600 # ifdef LOGIN_NEEDS_UTMPX
606 /* Do common processing for the child, such as execing the command. */
607 do_child(s, command);
611 signal(WJSIGNAL, cray_job_termination_handler);
615 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
618 packet_disconnect("fork failed: %.100s", strerror(errno));
621 /* Parent. Close the slave side of the pseudo tty. */
625 * Create another descriptor of the pty master side for use as the
626 * standard input. We could use the original descriptor, but this
627 * simplifies code in server_loop. The descriptor is bidirectional.
631 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
633 /* we keep a reference to the pty master */
634 ptymaster = dup(ptyfd);
636 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
637 s->ptymaster = ptymaster;
639 /* Enter interactive session. */
640 packet_set_interactive(1);
642 session_set_fds(s, ptyfd, fdout, -1);
644 server_loop(pid, ptyfd, fdout, -1);
645 /* server_loop _has_ closed ptyfd and fdout. */
649 #ifdef LOGIN_NEEDS_UTMPX
651 do_pre_login(Session *s)
654 struct sockaddr_storage from;
655 pid_t pid = getpid();
658 * Get IP address of client. If the connection is not a socket, let
659 * the address be 0.0.0.0.
661 memset(&from, 0, sizeof(from));
662 fromlen = sizeof(from);
663 if (packet_connection_is_on_socket()) {
664 if (getpeername(packet_get_connection_in(),
665 (struct sockaddr *) & from, &fromlen) < 0) {
666 debug("getpeername: %.100s", strerror(errno));
671 record_utmp_only(pid, s->tty, s->pw->pw_name,
672 get_remote_name_or_ip(utmp_len, options.use_dns),
673 (struct sockaddr *)&from, fromlen);
678 * This is called to fork and execute a command. If another command is
679 * to be forced, execute that instead.
682 do_exec(Session *s, const char *command)
684 if (forced_command) {
685 original_command = command;
686 command = forced_command;
687 debug("Forced command '%.900s'", command);
691 do_exec_pty(s, command);
693 do_exec_no_pty(s, command);
695 original_command = NULL;
699 /* administrative, login(1)-like work */
701 do_login(Session *s, const char *command)
705 struct sockaddr_storage from;
706 struct passwd * pw = s->pw;
707 pid_t pid = getpid();
710 * Get IP address of client. If the connection is not a socket, let
711 * the address be 0.0.0.0.
713 memset(&from, 0, sizeof(from));
714 fromlen = sizeof(from);
715 if (packet_connection_is_on_socket()) {
716 if (getpeername(packet_get_connection_in(),
717 (struct sockaddr *) & from, &fromlen) < 0) {
718 debug("getpeername: %.100s", strerror(errno));
723 /* Record that there was a login on that tty from the remote host. */
725 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
726 get_remote_name_or_ip(utmp_len,
728 (struct sockaddr *)&from, fromlen);
732 * If password change is needed, do it now.
733 * This needs to occur before the ~/.hushlogin check.
735 if (options.use_pam && is_pam_password_change_required()) {
736 print_pam_messages();
738 /* XXX - signal [net] parent to enable forwardings */
742 if (check_quietlogin(s, command))
746 if (options.use_pam && !is_pam_password_change_required())
747 print_pam_messages();
750 /* display post-login message */
751 if (buffer_len(&loginmsg) > 0) {
752 buffer_append(&loginmsg, "\0", 1);
753 printf("%s\n", (char *)buffer_ptr(&loginmsg));
755 buffer_free(&loginmsg);
757 #ifndef NO_SSH_LASTLOG
758 if (options.print_lastlog && s->last_login_time != 0) {
759 time_string = ctime(&s->last_login_time);
760 if (strchr(time_string, '\n'))
761 *strchr(time_string, '\n') = 0;
762 if (strcmp(s->hostname, "") == 0)
763 printf("Last login: %s\r\n", time_string);
765 printf("Last login: %s from %s\r\n", time_string,
768 #endif /* NO_SSH_LASTLOG */
774 * Display the message of the day.
782 if (options.print_motd) {
783 #ifdef HAVE_LOGIN_CAP
784 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
787 f = fopen("/etc/motd", "r");
790 while (fgets(buf, sizeof(buf), f))
799 * Check for quiet login, either .hushlogin or command given.
802 check_quietlogin(Session *s, const char *command)
805 struct passwd *pw = s->pw;
808 /* Return 1 if .hushlogin exists or a command given. */
811 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
812 #ifdef HAVE_LOGIN_CAP
813 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
816 if (stat(buf, &st) >= 0)
823 * Sets the value of the given variable in the environment. If the variable
824 * already exists, its value is overriden.
827 child_set_env(char ***envp, u_int *envsizep, const char *name,
834 * Find the slot where the value should be stored. If the variable
835 * already exists, we reuse the slot; otherwise we append a new slot
836 * at the end of the array, expanding if necessary.
839 namelen = strlen(name);
840 for (i = 0; env[i]; i++)
841 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
844 /* Reuse the slot. */
847 /* New variable. Expand if necessary. */
848 if (i >= (*envsizep) - 1) {
849 if (*envsizep >= 1000)
850 fatal("child_set_env: too many env vars,"
851 " skipping: %.100s", name);
853 env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
855 /* Need to set the NULL pointer at end of array beyond the new slot. */
859 /* Allocate space and format the variable in the appropriate slot. */
860 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
861 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
865 * Reads environment variables from the given file and adds/overrides them
866 * into the environment. If the file does not exist, this does nothing.
867 * Otherwise, it must consist of empty lines, comments (line starts with '#')
868 * and assignments of the form name=value. No other forms are allowed.
871 read_environment_file(char ***env, u_int *envsize,
872 const char *filename)
879 f = fopen(filename, "r");
883 while (fgets(buf, sizeof(buf), f)) {
885 fatal("Too many lines in environment file %s", filename);
886 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
888 if (!*cp || *cp == '#' || *cp == '\n')
890 if (strchr(cp, '\n'))
891 *strchr(cp, '\n') = '\0';
892 value = strchr(cp, '=');
894 fprintf(stderr, "Bad line %u in %.100s\n", lineno,
899 * Replace the equals sign by nul, and advance value to
904 child_set_env(env, envsize, cp, value);
909 void copy_environment(char **source, char ***env, u_int *envsize)
911 char *var_name, *var_val;
917 for(i = 0; source[i] != NULL; i++) {
918 var_name = xstrdup(source[i]);
919 if ((var_val = strstr(var_name, "=")) == NULL) {
925 debug3("Copy environment: %s=%s", var_name, var_val);
926 child_set_env(env, envsize, var_name, var_val);
933 do_setup_env(Session *s, const char *shell)
938 struct passwd *pw = s->pw;
940 /* Initialize the environment. */
942 env = xmalloc(envsize * sizeof(char *));
947 * The Windows environment contains some setting which are
948 * important for a running system. They must not be dropped.
950 copy_environment(environ, &env, &envsize);
954 /* Allow any GSSAPI methods that we've used to alter
955 * the childs environment as they see fit
957 ssh_gssapi_do_child(&env, &envsize);
960 if (!options.use_login) {
961 /* Set basic environment. */
962 child_set_env(&env, &envsize, "USER", pw->pw_name);
963 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
965 child_set_env(&env, &envsize, "LOGIN", pw->pw_name);
967 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
968 #ifdef HAVE_LOGIN_CAP
969 if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
970 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
972 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
973 #else /* HAVE_LOGIN_CAP */
976 * There's no standard path on Windows. The path contains
977 * important components pointing to the system directories,
978 * needed for loading shared libraries. So the path better
979 * remains intact here.
981 # ifdef SUPERUSER_PATH
982 child_set_env(&env, &envsize, "PATH",
983 s->pw->pw_uid == 0 ? SUPERUSER_PATH : _PATH_STDPATH);
985 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
986 # endif /* SUPERUSER_PATH */
987 # endif /* HAVE_CYGWIN */
988 #endif /* HAVE_LOGIN_CAP */
990 snprintf(buf, sizeof buf, "%.200s/%.50s",
991 _PATH_MAILDIR, pw->pw_name);
992 child_set_env(&env, &envsize, "MAIL", buf);
994 /* Normal systems set SHELL by default. */
995 child_set_env(&env, &envsize, "SHELL", shell);
998 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1000 /* Set custom environment options from RSA authentication. */
1001 if (!options.use_login) {
1002 while (custom_environment) {
1003 struct envstring *ce = custom_environment;
1006 for (i = 0; str[i] != '=' && str[i]; i++)
1008 if (str[i] == '=') {
1010 child_set_env(&env, &envsize, str, str + i + 1);
1012 custom_environment = ce->next;
1018 /* SSH_CLIENT deprecated */
1019 snprintf(buf, sizeof buf, "%.50s %d %d",
1020 get_remote_ipaddr(), get_remote_port(), get_local_port());
1021 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1023 laddr = get_local_ipaddr(packet_get_connection_in());
1024 snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1025 get_remote_ipaddr(), get_remote_port(), laddr, get_local_port());
1027 child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1030 child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1032 child_set_env(&env, &envsize, "TERM", s->term);
1034 child_set_env(&env, &envsize, "DISPLAY", s->display);
1035 if (original_command)
1036 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1040 if (cray_tmpdir[0] != '\0')
1041 child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir);
1042 #endif /* _UNICOS */
1048 if ((cp = getenv("AUTHSTATE")) != NULL)
1049 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1050 if ((cp = getenv("KRB5CCNAME")) != NULL)
1051 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1052 read_environment_file(&env, &envsize, "/etc/environment");
1056 if (s->authctxt->krb5_ticket_file)
1057 child_set_env(&env, &envsize, "KRB5CCNAME",
1058 s->authctxt->krb5_ticket_file);
1062 * Pull in any environment variables that may have
1065 if (options.use_pam) {
1066 char **p = fetch_pam_environment();
1068 copy_environment(p, &env, &envsize);
1069 free_pam_environment(p);
1071 #endif /* USE_PAM */
1073 if (auth_sock_name != NULL)
1074 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1077 /* read $HOME/.ssh/environment. */
1078 if (options.permit_user_env && !options.use_login) {
1079 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1080 strcmp(pw->pw_dir, "/") ? pw->pw_dir : "");
1081 read_environment_file(&env, &envsize, buf);
1084 /* dump the environment */
1085 fprintf(stderr, "Environment:\n");
1086 for (i = 0; env[i]; i++)
1087 fprintf(stderr, " %.200s\n", env[i]);
1093 * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
1094 * first in this order).
1097 do_rc_files(Session *s, const char *shell)
1105 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
1107 /* ignore _PATH_SSH_USER_RC for subsystems */
1108 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
1109 snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
1110 shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
1112 fprintf(stderr, "Running %s\n", cmd);
1113 f = popen(cmd, "w");
1116 fprintf(f, "%s %s\n", s->auth_proto,
1120 fprintf(stderr, "Could not run %s\n",
1122 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
1124 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
1125 _PATH_SSH_SYSTEM_RC);
1126 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
1129 fprintf(f, "%s %s\n", s->auth_proto,
1133 fprintf(stderr, "Could not run %s\n",
1134 _PATH_SSH_SYSTEM_RC);
1135 } else if (do_xauth && options.xauth_location != NULL) {
1136 /* Add authority data to .Xauthority if appropriate. */
1139 "Running %.500s remove %.100s\n",
1140 options.xauth_location, s->auth_display);
1142 "%.500s add %.100s %.100s %.100s\n",
1143 options.xauth_location, s->auth_display,
1144 s->auth_proto, s->auth_data);
1146 snprintf(cmd, sizeof cmd, "%s -q -",
1147 options.xauth_location);
1148 f = popen(cmd, "w");
1150 fprintf(f, "remove %s\n",
1152 fprintf(f, "add %s %s %s\n",
1153 s->auth_display, s->auth_proto,
1157 fprintf(stderr, "Could not run %s\n",
1164 do_nologin(struct passwd *pw)
1169 #ifdef HAVE_LOGIN_CAP
1170 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1171 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1172 _PATH_NOLOGIN), "r");
1175 f = fopen(_PATH_NOLOGIN, "r");
1178 /* /etc/nologin exists. Print its contents and exit. */
1179 logit("User %.100s not allowed because %s exists",
1180 pw->pw_name, _PATH_NOLOGIN);
1181 while (fgets(buf, sizeof(buf), f))
1189 /* Set login name, uid, gid, and groups. */
1191 do_setusercontext(struct passwd *pw)
1194 if (getuid() == 0 || geteuid() == 0)
1195 #endif /* HAVE_CYGWIN */
1198 #ifdef HAVE_SETPCRED
1199 if (setpcred(pw->pw_name, (char **)NULL) == -1)
1200 fatal("Failed to set process credentials");
1201 #endif /* HAVE_SETPCRED */
1202 #ifdef HAVE_LOGIN_CAP
1206 if (setusercontext(lc, pw, pw->pw_uid,
1207 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1208 perror("unable to set user context");
1212 # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
1213 /* Sets login uid for accounting */
1214 if (getluid() == -1 && setluid(pw->pw_uid) == -1)
1215 error("setluid: %s", strerror(errno));
1216 # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
1218 if (setlogin(pw->pw_name) < 0)
1219 error("setlogin failed: %s", strerror(errno));
1220 if (setgid(pw->pw_gid) < 0) {
1224 /* Initialize the group list. */
1225 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1226 perror("initgroups");
1232 * PAM credentials may take the form of supplementary groups.
1233 * These will have been wiped by the above initgroups() call.
1234 * Reestablish them here.
1236 if (options.use_pam)
1238 # endif /* USE_PAM */
1239 # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
1240 irix_setusercontext(pw);
1241 # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
1245 /* Permanently switch to the desired uid. */
1246 permanently_set_uid(pw);
1253 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1254 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1258 launch_login(struct passwd *pw, const char *hostname)
1260 /* Launch login(1). */
1262 execl(LOGIN_PROGRAM, "login", "-h", hostname,
1263 #ifdef xxxLOGIN_NEEDS_TERM
1264 (s->term ? s->term : "unknown"),
1265 #endif /* LOGIN_NEEDS_TERM */
1266 #ifdef LOGIN_NO_ENDOPT
1267 "-p", "-f", pw->pw_name, (char *)NULL);
1269 "-p", "-f", "--", pw->pw_name, (char *)NULL);
1272 /* Login couldn't be executed, die. */
1279 * Performs common processing for the child, such as setting up the
1280 * environment, closing extra file descriptors, setting the user and group
1281 * ids, and executing the command or shell.
1284 do_child(Session *s, const char *command)
1286 extern char **environ;
1289 const char *shell, *shell0, *hostname = NULL;
1290 struct passwd *pw = s->pw;
1293 /* remove hostkey from the child's memory */
1294 destroy_sensitive_data();
1296 /* login(1) is only called if we execute the login shell */
1297 if (options.use_login && command != NULL)
1298 options.use_login = 0;
1301 cray_setup(pw->pw_uid, pw->pw_name, command);
1302 #endif /* _UNICOS */
1305 * Login(1) does this as well, and it needs uid 0 for the "-h"
1306 * switch, so we let login(1) to this for us.
1308 if (!options.use_login) {
1310 session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty);
1311 if (!check_quietlogin(s, command))
1313 #else /* HAVE_OSF_SIA */
1315 do_setusercontext(pw);
1316 #endif /* HAVE_OSF_SIA */
1320 * Get the shell from the password data. An empty shell field is
1321 * legal, and means /bin/sh.
1323 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1326 * Make sure $SHELL points to the shell from the password file,
1327 * even if shell is overridden from login.conf
1329 env = do_setup_env(s, shell);
1331 #ifdef HAVE_LOGIN_CAP
1332 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1335 /* we have to stash the hostname before we close our socket. */
1336 if (options.use_login)
1337 hostname = get_remote_name_or_ip(utmp_len,
1340 * Close the connection descriptors; note that this is the child, and
1341 * the server will still have the socket open, and it is important
1342 * that we do not shutdown it. Note that the descriptors cannot be
1343 * closed before building the environment, as we call
1344 * get_remote_ipaddr there.
1346 if (packet_get_connection_in() == packet_get_connection_out())
1347 close(packet_get_connection_in());
1349 close(packet_get_connection_in());
1350 close(packet_get_connection_out());
1353 * Close all descriptors related to channels. They will still remain
1354 * open in the parent.
1356 /* XXX better use close-on-exec? -markus */
1357 channel_close_all();
1360 * Close any extra file descriptors. Note that there may still be
1361 * descriptors left by system functions. They will be closed later.
1366 * Close any extra open file descriptors so that we don\'t have them
1367 * hanging around in clients. Note that we want to do this after
1368 * initgroups, because at least on Solaris 2.3 it leaves file
1371 for (i = 3; i < 64; i++)
1375 * Must take new environment into use so that .ssh/rc,
1376 * /etc/ssh/sshrc and xauth are run in the proper environment.
1380 /* Change current directory to the user\'s home directory. */
1381 if (chdir(pw->pw_dir) < 0) {
1382 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1383 pw->pw_dir, strerror(errno));
1384 #ifdef HAVE_LOGIN_CAP
1385 if (login_getcapbool(lc, "requirehome", 0))
1390 if (!options.use_login)
1391 do_rc_files(s, shell);
1393 /* restore SIGPIPE for child */
1394 signal(SIGPIPE, SIG_DFL);
1396 if (options.use_login) {
1397 launch_login(pw, hostname);
1401 /* Get the last component of the shell name. */
1402 if ((shell0 = strrchr(shell, '/')) != NULL)
1408 * If we have no command, execute the shell. In this case, the shell
1409 * name to be passed in argv[0] is preceded by '-' to indicate that
1410 * this is a login shell.
1415 /* Start the shell. Set initial character to '-'. */
1418 if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1419 >= sizeof(argv0) - 1) {
1425 /* Execute the shell. */
1428 execve(shell, argv, env);
1430 /* Executing the shell failed. */
1435 * Execute the command using the user's shell. This uses the -c
1436 * option to execute the command.
1438 argv[0] = (char *) shell0;
1440 argv[2] = (char *) command;
1442 execve(shell, argv, env);
1451 static int did_init = 0;
1453 debug("session_new: init");
1454 for (i = 0; i < MAX_SESSIONS; i++) {
1455 sessions[i].used = 0;
1459 for (i = 0; i < MAX_SESSIONS; i++) {
1460 Session *s = &sessions[i];
1462 memset(s, 0, sizeof(*s));
1468 debug("session_new: session %d", i);
1479 for (i = 0; i < MAX_SESSIONS; i++) {
1480 Session *s = &sessions[i];
1481 debug("dump: used %d session %d %p channel %d pid %ld",
1491 session_open(Authctxt *authctxt, int chanid)
1493 Session *s = session_new();
1494 debug("session_open: channel %d", chanid);
1496 error("no more sessions");
1499 s->authctxt = authctxt;
1500 s->pw = authctxt->pw;
1502 fatal("no user for session %d", s->self);
1503 debug("session_open: session %d: link with channel %d", s->self, chanid);
1509 session_by_tty(char *tty)
1512 for (i = 0; i < MAX_SESSIONS; i++) {
1513 Session *s = &sessions[i];
1514 if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1515 debug("session_by_tty: session %d tty %s", i, tty);
1519 debug("session_by_tty: unknown tty %.100s", tty);
1525 session_by_channel(int id)
1528 for (i = 0; i < MAX_SESSIONS; i++) {
1529 Session *s = &sessions[i];
1530 if (s->used && s->chanid == id) {
1531 debug("session_by_channel: session %d channel %d", i, id);
1535 debug("session_by_channel: unknown channel %d", id);
1541 session_by_pid(pid_t pid)
1544 debug("session_by_pid: pid %ld", (long)pid);
1545 for (i = 0; i < MAX_SESSIONS; i++) {
1546 Session *s = &sessions[i];
1547 if (s->used && s->pid == pid)
1550 error("session_by_pid: unknown pid %ld", (long)pid);
1556 session_window_change_req(Session *s)
1558 s->col = packet_get_int();
1559 s->row = packet_get_int();
1560 s->xpixel = packet_get_int();
1561 s->ypixel = packet_get_int();
1563 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1568 session_pty_req(Session *s)
1574 debug("Allocating a pty not permitted for this authentication.");
1577 if (s->ttyfd != -1) {
1578 packet_disconnect("Protocol error: you already have a pty.");
1581 /* Get the time and hostname when the user last logged in. */
1582 if (options.print_lastlog) {
1583 s->hostname[0] = '\0';
1584 s->last_login_time = get_last_login_time(s->pw->pw_uid,
1585 s->pw->pw_name, s->hostname, sizeof(s->hostname));
1588 s->term = packet_get_string(&len);
1591 s->col = packet_get_int();
1592 s->row = packet_get_int();
1594 s->row = packet_get_int();
1595 s->col = packet_get_int();
1597 s->xpixel = packet_get_int();
1598 s->ypixel = packet_get_int();
1600 if (strcmp(s->term, "") == 0) {
1605 /* Allocate a pty and open it. */
1606 debug("Allocating pty.");
1607 if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
1613 error("session_pty_req: session %d alloc failed", s->self);
1616 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1618 /* for SSH1 the tty modes length is not given */
1620 n_bytes = packet_remaining();
1621 tty_parse_modes(s->ttyfd, &n_bytes);
1624 * Add a cleanup function to clear the utmp entry and record logout
1625 * time in case we call fatal() (e.g., the connection gets closed).
1627 fatal_add_cleanup(session_pty_cleanup, (void *)s);
1629 pty_setowner(s->pw, s->tty);
1631 /* Set window size from the packet. */
1632 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1635 session_proctitle(s);
1640 session_subsystem_req(Session *s)
1645 char *cmd, *subsys = packet_get_string(&len);
1649 logit("subsystem request for %.100s", subsys);
1651 for (i = 0; i < options.num_subsystems; i++) {
1652 if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1653 cmd = options.subsystem_command[i];
1654 if (stat(cmd, &st) < 0) {
1655 error("subsystem: cannot stat %s: %s", cmd,
1659 debug("subsystem: exec() %s", cmd);
1660 s->is_subsystem = 1;
1668 logit("subsystem request for %.100s failed, subsystem not found",
1676 session_x11_req(Session *s)
1680 s->single_connection = packet_get_char();
1681 s->auth_proto = packet_get_string(NULL);
1682 s->auth_data = packet_get_string(NULL);
1683 s->screen = packet_get_int();
1686 success = session_setup_x11fwd(s);
1688 xfree(s->auth_proto);
1689 xfree(s->auth_data);
1690 s->auth_proto = NULL;
1691 s->auth_data = NULL;
1697 session_shell_req(Session *s)
1705 session_exec_req(Session *s)
1708 char *command = packet_get_string(&len);
1710 do_exec(s, command);
1716 session_break_req(Session *s)
1720 break_length = packet_get_int(); /* ignored */
1723 if (s->ttyfd == -1 ||
1724 tcsendbreak(s->ttyfd, 0) < 0)
1730 session_auth_agent_req(Session *s)
1732 static int called = 0;
1734 if (no_agent_forwarding_flag) {
1735 debug("session_auth_agent_req: no_agent_forwarding_flag");
1742 return auth_input_request_forwarding(s->pw);
1747 session_input_channel_req(Channel *c, const char *rtype)
1752 if ((s = session_by_channel(c->self)) == NULL) {
1753 logit("session_input_channel_req: no session %d req %.100s",
1757 debug("session_input_channel_req: session %d req %s", s->self, rtype);
1760 * a session is in LARVAL state until a shell, a command
1761 * or a subsystem is executed
1763 if (c->type == SSH_CHANNEL_LARVAL) {
1764 if (strcmp(rtype, "shell") == 0) {
1765 success = session_shell_req(s);
1766 } else if (strcmp(rtype, "exec") == 0) {
1767 success = session_exec_req(s);
1768 } else if (strcmp(rtype, "pty-req") == 0) {
1769 success = session_pty_req(s);
1770 } else if (strcmp(rtype, "x11-req") == 0) {
1771 success = session_x11_req(s);
1772 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1773 success = session_auth_agent_req(s);
1774 } else if (strcmp(rtype, "subsystem") == 0) {
1775 success = session_subsystem_req(s);
1776 } else if (strcmp(rtype, "break") == 0) {
1777 success = session_break_req(s);
1780 if (strcmp(rtype, "window-change") == 0) {
1781 success = session_window_change_req(s);
1787 session_set_fds(Session *s, int fdin, int fdout, int fderr)
1790 fatal("session_set_fds: called for proto != 2.0");
1792 * now that have a child and a pipe to the child,
1793 * we can activate our channel and register the fd's
1795 if (s->chanid == -1)
1796 fatal("no channel for session %d", s->self);
1797 channel_set_fds(s->chanid,
1799 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1801 CHAN_SES_WINDOW_DEFAULT);
1805 * Function to perform pty cleanup. Also called if we get aborted abnormally
1806 * (e.g., due to a dropped connection).
1809 session_pty_cleanup2(void *session)
1811 Session *s = session;
1814 error("session_pty_cleanup: no session");
1820 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1822 /* Record that the user has logged out. */
1824 record_logout(s->pid, s->tty, s->pw->pw_name);
1826 /* Release the pseudo-tty. */
1828 pty_release(s->tty);
1831 * Close the server side of the socket pairs. We must do this after
1832 * the pty cleanup, so that another process doesn't get this pty
1833 * while we're still cleaning up.
1835 if (close(s->ptymaster) < 0)
1836 error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
1838 /* unlink pty from session */
1843 session_pty_cleanup(void *session)
1845 PRIVSEP(session_pty_cleanup2(session));
1851 #define SSH_SIG(x) if (sig == SIG ## x) return #x
1866 return "SIG@openssh.com";
1870 session_exit_message(Session *s, int status)
1874 if ((c = channel_lookup(s->chanid)) == NULL)
1875 fatal("session_exit_message: session %d: no channel %d",
1876 s->self, s->chanid);
1877 debug("session_exit_message: session %d channel %d pid %ld",
1878 s->self, s->chanid, (long)s->pid);
1880 if (WIFEXITED(status)) {
1881 channel_request_start(s->chanid, "exit-status", 0);
1882 packet_put_int(WEXITSTATUS(status));
1884 } else if (WIFSIGNALED(status)) {
1885 channel_request_start(s->chanid, "exit-signal", 0);
1886 packet_put_cstring(sig2name(WTERMSIG(status)));
1888 packet_put_char(WCOREDUMP(status));
1889 #else /* WCOREDUMP */
1891 #endif /* WCOREDUMP */
1892 packet_put_cstring("");
1893 packet_put_cstring("");
1896 /* Some weird exit cause. Just exit. */
1897 packet_disconnect("wait returned status %04x.", status);
1900 /* disconnect channel */
1901 debug("session_exit_message: release channel %d", s->chanid);
1902 channel_cancel_cleanup(s->chanid);
1904 * emulate a write failure with 'chan_write_failed', nobody will be
1905 * interested in data we write.
1906 * Note that we must not call 'chan_read_failed', since there could
1907 * be some more data waiting in the pipe.
1909 if (c->ostate != CHAN_OUTPUT_CLOSED)
1910 chan_write_failed(c);
1915 session_close(Session *s)
1917 debug("session_close: session %d pid %ld", s->self, (long)s->pid);
1918 if (s->ttyfd != -1) {
1919 fatal_remove_cleanup(session_pty_cleanup, (void *)s);
1920 session_pty_cleanup(s);
1926 if (s->auth_display)
1927 xfree(s->auth_display);
1929 xfree(s->auth_data);
1931 xfree(s->auth_proto);
1933 session_proctitle(s);
1937 session_close_by_pid(pid_t pid, int status)
1939 Session *s = session_by_pid(pid);
1941 debug("session_close_by_pid: no session for pid %ld",
1945 if (s->chanid != -1)
1946 session_exit_message(s, status);
1951 * this is called when a channel dies before
1952 * the session 'child' itself dies
1955 session_close_by_channel(int id, void *arg)
1957 Session *s = session_by_channel(id);
1959 debug("session_close_by_channel: no session for id %d", id);
1962 debug("session_close_by_channel: channel %d child %ld",
1965 debug("session_close_by_channel: channel %d: has child", id);
1967 * delay detach of session, but release pty, since
1968 * the fd's to the child are already closed
1970 if (s->ttyfd != -1) {
1971 fatal_remove_cleanup(session_pty_cleanup, (void *)s);
1972 session_pty_cleanup(s);
1976 /* detach by removing callback */
1977 channel_cancel_cleanup(s->chanid);
1983 session_destroy_all(void (*closefunc)(Session *))
1986 for (i = 0; i < MAX_SESSIONS; i++) {
1987 Session *s = &sessions[i];
1989 if (closefunc != NULL)
1998 session_tty_list(void)
2000 static char buf[1024];
2005 for (i = 0; i < MAX_SESSIONS; i++) {
2006 Session *s = &sessions[i];
2007 if (s->used && s->ttyfd != -1) {
2009 if (strncmp(s->tty, "/dev/", 5) != 0) {
2010 cp = strrchr(s->tty, '/');
2011 cp = (cp == NULL) ? s->tty : cp + 1;
2016 strlcat(buf, ",", sizeof buf);
2017 strlcat(buf, cp, sizeof buf);
2021 strlcpy(buf, "notty", sizeof buf);
2026 session_proctitle(Session *s)
2029 error("no user for session %d", s->self);
2031 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
2035 session_setup_x11fwd(Session *s)
2038 char display[512], auth_display[512];
2039 char hostname[MAXHOSTNAMELEN];
2041 if (no_x11_forwarding_flag) {
2042 packet_send_debug("X11 forwarding disabled in user configuration file.");
2045 if (!options.x11_forwarding) {
2046 debug("X11 forwarding disabled in server configuration file.");
2049 if (!options.xauth_location ||
2050 (stat(options.xauth_location, &st) == -1)) {
2051 packet_send_debug("No xauth program; cannot forward with spoofing.");
2054 if (options.use_login) {
2055 packet_send_debug("X11 forwarding disabled; "
2056 "not compatible with UseLogin=yes.");
2059 if (s->display != NULL) {
2060 debug("X11 display already set.");
2063 if (x11_create_display_inet(options.x11_display_offset,
2064 options.x11_use_localhost, s->single_connection,
2065 &s->display_number) == -1) {
2066 debug("x11_create_display_inet failed.");
2070 /* Set up a suitable value for the DISPLAY variable. */
2071 if (gethostname(hostname, sizeof(hostname)) < 0)
2072 fatal("gethostname: %.100s", strerror(errno));
2074 * auth_display must be used as the displayname when the
2075 * authorization entry is added with xauth(1). This will be
2076 * different than the DISPLAY string for localhost displays.
2078 if (options.x11_use_localhost) {
2079 snprintf(display, sizeof display, "localhost:%u.%u",
2080 s->display_number, s->screen);
2081 snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
2082 s->display_number, s->screen);
2083 s->display = xstrdup(display);
2084 s->auth_display = xstrdup(auth_display);
2086 #ifdef IPADDR_IN_DISPLAY
2088 struct in_addr my_addr;
2090 he = gethostbyname(hostname);
2092 error("Can't get IP address for X11 DISPLAY.");
2093 packet_send_debug("Can't get IP address for X11 DISPLAY.");
2096 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
2097 snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr),
2098 s->display_number, s->screen);
2100 snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
2101 s->display_number, s->screen);
2103 s->display = xstrdup(display);
2104 s->auth_display = xstrdup(display);
2111 do_authenticated2(Authctxt *authctxt)
2113 server_loop2(authctxt);
2115 if (options.gss_cleanup_creds)
2116 ssh_gssapi_cleanup_creds(NULL);