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 1.123 2002/02/03 17:53:25 markus 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;
107 int ptyfd, ttyfd, ptymaster;
108 int row, col, xpixel, ypixel;
117 int single_connection;
125 Session *session_new(void);
126 void session_set_fds(Session *, int, int, int);
127 static void session_pty_cleanup(void *);
128 void session_proctitle(Session *);
129 int session_setup_x11fwd(Session *);
130 void do_exec_pty(Session *, const char *);
131 void do_exec_no_pty(Session *, const char *);
132 void do_exec(Session *, const char *);
133 void do_login(Session *, const char *);
134 #ifdef LOGIN_NEEDS_UTMPX
135 static void do_pre_login(Session *s);
137 void do_child(Session *, const char *);
139 int check_quietlogin(Session *, const char *);
141 static void do_authenticated1(Authctxt *);
142 static void do_authenticated2(Authctxt *);
144 static void session_close(Session *);
145 static int session_pty_req(Session *);
148 extern ServerOptions options;
149 extern char *__progname;
150 extern int log_stderr;
151 extern int debug_flag;
152 extern u_int utmp_len;
153 extern int startup_pipe;
154 extern void destroy_sensitive_data(void);
156 /* original command from peer. */
157 const char *original_command = NULL;
160 #define MAX_SESSIONS 10
161 Session sessions[MAX_SESSIONS];
163 #ifdef WITH_AIXAUTHENTICATE
165 #endif /* WITH_AIXAUTHENTICATE */
167 #ifdef HAVE_LOGIN_CAP
168 static login_cap_t *lc;
172 do_authenticated(Authctxt *authctxt)
175 * Cancel the alarm we set to limit the time taken for
179 if (startup_pipe != -1) {
183 #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD)
184 if ((lc = login_getclass(authctxt->pw->pw_class)) == NULL) {
185 error("unable to get login class");
189 if (auth_approval(NULL, lc, authctxt->pw->pw_name, "ssh") <= 0) {
190 packet_disconnect("Approval failure for %s",
191 authctxt->pw->pw_name);
195 #ifdef WITH_AIXAUTHENTICATE
196 /* We don't have a pty yet, so just label the line as "ssh" */
197 if (loginsuccess(authctxt->user,
198 get_canonical_hostname(options.reverse_mapping_check),
199 "ssh", &aixloginmsg) < 0)
201 #endif /* WITH_AIXAUTHENTICATE */
203 /* setup the channel layer */
204 if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
205 channel_permit_all_opens();
208 do_authenticated2(authctxt);
210 do_authenticated1(authctxt);
212 /* remove agent socket */
213 if (auth_get_socket_name())
214 auth_sock_cleanup_proc(authctxt->pw);
216 if (options.kerberos_ticket_cleanup)
217 krb4_cleanup_proc(authctxt);
220 if (options.kerberos_ticket_cleanup)
221 krb5_cleanup_proc(authctxt);
226 * Prepares for an interactive session. This is called after the user has
227 * been successfully authenticated. During this message exchange, pseudo
228 * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
229 * are requested, etc.
232 do_authenticated1(Authctxt *authctxt)
236 int success, type, screen_flag;
237 int compression_level = 0, enable_compression_after_reply = 0;
238 u_int proto_len, data_len, dlen;
241 s->authctxt = authctxt;
242 s->pw = authctxt->pw;
245 * We stay in this loop until the client requests to execute a shell
251 /* Get a packet from the client. */
252 type = packet_read();
254 /* Process the packet. */
256 case SSH_CMSG_REQUEST_COMPRESSION:
257 compression_level = packet_get_int();
259 if (compression_level < 1 || compression_level > 9) {
260 packet_send_debug("Received illegal compression level %d.",
264 /* Enable compression after we have responded with SUCCESS. */
265 enable_compression_after_reply = 1;
269 case SSH_CMSG_REQUEST_PTY:
270 success = session_pty_req(s);
273 case SSH_CMSG_X11_REQUEST_FORWARDING:
274 s->auth_proto = packet_get_string(&proto_len);
275 s->auth_data = packet_get_string(&data_len);
277 screen_flag = packet_get_protocol_flags() &
278 SSH_PROTOFLAG_SCREEN_NUMBER;
279 debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
281 if (packet_remaining() == 4) {
283 debug2("Buggy client: "
284 "X11 screen flag missing");
285 s->screen = packet_get_int();
290 success = session_setup_x11fwd(s);
292 xfree(s->auth_proto);
294 s->auth_proto = NULL;
299 case SSH_CMSG_AGENT_REQUEST_FORWARDING:
300 if (no_agent_forwarding_flag || compat13) {
301 debug("Authentication agent forwarding not permitted for this authentication.");
304 debug("Received authentication agent forwarding request.");
305 success = auth_input_request_forwarding(s->pw);
308 case SSH_CMSG_PORT_FORWARD_REQUEST:
309 if (no_port_forwarding_flag) {
310 debug("Port forwarding not permitted for this authentication.");
313 if (!options.allow_tcp_forwarding) {
314 debug("Port forwarding not permitted.");
317 debug("Received TCP/IP port forwarding request.");
318 channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
322 case SSH_CMSG_MAX_PACKET_SIZE:
323 if (packet_set_maxsize(packet_get_int()) > 0)
327 #if defined(AFS) || defined(KRB5)
328 case SSH_CMSG_HAVE_KERBEROS_TGT:
329 if (!options.kerberos_tgt_passing) {
330 verbose("Kerberos TGT passing disabled.");
332 char *kdata = packet_get_string(&dlen);
335 /* XXX - 0x41, see creds_to_radix version */
336 if (kdata[0] != 0x41) {
342 if (auth_krb5_tgt(s->authctxt, &tgt))
345 verbose("Kerberos v5 TGT refused for %.100s", s->authctxt->user);
349 if (auth_krb4_tgt(s->authctxt, kdata))
352 verbose("Kerberos v4 TGT refused for %.100s", s->authctxt->user);
358 #endif /* AFS || KRB5 */
361 case SSH_CMSG_HAVE_AFS_TOKEN:
362 if (!options.afs_token_passing || !k_hasafs()) {
363 verbose("AFS token passing disabled.");
365 /* Accept AFS token. */
366 char *token = packet_get_string(&dlen);
369 if (auth_afs_token(s->authctxt, token))
372 verbose("AFS token refused for %.100s",
379 case SSH_CMSG_EXEC_SHELL:
380 case SSH_CMSG_EXEC_CMD:
381 if (type == SSH_CMSG_EXEC_CMD) {
382 command = packet_get_string(&dlen);
383 debug("Exec command '%.500s'", command);
395 * Any unknown messages in this phase are ignored,
396 * and a failure message is returned.
398 log("Unknown packet type received after authentication: %d", type);
400 packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
404 /* Enable compression now that we have replied if appropriate. */
405 if (enable_compression_after_reply) {
406 enable_compression_after_reply = 0;
407 packet_start_compression(compression_level);
413 * This is called to fork and execute a command when we have no tty. This
414 * will call do_child from the child, and server_loop from the parent after
415 * setting up file descriptors and such.
418 do_exec_no_pty(Session *s, const char *command)
423 int pin[2], pout[2], perr[2];
424 /* Allocate pipes for communicating with the program. */
425 if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
426 packet_disconnect("Could not create pipes: %.100s",
428 #else /* USE_PIPES */
429 int inout[2], err[2];
430 /* Uses socket pairs to communicate with the program. */
431 if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
432 socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
433 packet_disconnect("Could not create socket pairs: %.100s",
435 #endif /* USE_PIPES */
437 fatal("do_exec_no_pty: no session");
439 session_proctitle(s);
442 do_pam_session(s->pw->pw_name, NULL);
444 if (is_pam_password_change_required())
445 packet_disconnect("Password change required but no "
449 /* Fork the child. */
450 if ((pid = fork()) == 0) {
451 /* Child. Reinitialize the log since the pid has changed. */
452 log_init(__progname, options.log_level, options.log_facility, log_stderr);
455 * Create a new session and process group since the 4.4BSD
456 * setlogin() affects the entire process group.
459 error("setsid failed: %.100s", strerror(errno));
463 * Redirect stdin. We close the parent side of the socket
464 * pair, and make the child side the standard input.
467 if (dup2(pin[0], 0) < 0)
468 perror("dup2 stdin");
471 /* Redirect stdout. */
473 if (dup2(pout[1], 1) < 0)
474 perror("dup2 stdout");
477 /* Redirect stderr. */
479 if (dup2(perr[1], 2) < 0)
480 perror("dup2 stderr");
482 #else /* USE_PIPES */
484 * Redirect stdin, stdout, and stderr. Stdin and stdout will
485 * use the same socket, as some programs (particularly rdist)
486 * seem to depend on it.
490 if (dup2(inout[0], 0) < 0) /* stdin */
491 perror("dup2 stdin");
492 if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
493 perror("dup2 stdout");
494 if (dup2(err[0], 2) < 0) /* stderr */
495 perror("dup2 stderr");
496 #endif /* USE_PIPES */
498 /* Do processing for the child (exec command etc). */
499 do_child(s, command);
504 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
507 packet_disconnect("fork failed: %.100s", strerror(errno));
509 /* Set interactive/non-interactive mode. */
510 packet_set_interactive(s->display != NULL);
512 /* We are the parent. Close the child sides of the pipes. */
518 session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]);
520 /* Enter the interactive session. */
521 server_loop(pid, pin[1], pout[0], perr[0]);
522 /* server_loop has closed pin[1], pout[0], and perr[0]. */
524 #else /* USE_PIPES */
525 /* We are the parent. Close the child sides of the socket pairs. */
530 * Enter the interactive session. Note: server_loop must be able to
531 * handle the case that fdin and fdout are the same.
534 session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
536 server_loop(pid, inout[1], inout[1], err[1]);
537 /* server_loop has closed inout[1] and err[1]. */
539 #endif /* USE_PIPES */
543 * This is called to fork and execute a command when we have a tty. This
544 * will call do_child from the child, and server_loop from the parent after
545 * setting up file descriptors, controlling tty, updating wtmp, utmp,
546 * lastlog, and other such operations.
549 do_exec_pty(Session *s, const char *command)
551 int fdout, ptyfd, ttyfd, ptymaster;
555 fatal("do_exec_pty: no session");
560 do_pam_session(s->pw->pw_name, s->tty);
564 /* Fork the child. */
565 if ((pid = fork()) == 0) {
567 /* Child. Reinitialize the log because the pid has changed. */
568 log_init(__progname, options.log_level, options.log_facility, log_stderr);
569 /* Close the master side of the pseudo tty. */
572 /* Make the pseudo tty our controlling tty. */
573 pty_make_controlling_tty(&ttyfd, s->tty);
575 /* Redirect stdin/stdout/stderr from the pseudo tty. */
576 if (dup2(ttyfd, 0) < 0)
577 error("dup2 stdin: %s", strerror(errno));
578 if (dup2(ttyfd, 1) < 0)
579 error("dup2 stdout: %s", strerror(errno));
580 if (dup2(ttyfd, 2) < 0)
581 error("dup2 stderr: %s", strerror(errno));
583 /* Close the extra descriptor for the pseudo tty. */
586 /* record login, etc. similar to login(1) */
588 if (!(options.use_login && command == NULL))
589 do_login(s, command);
590 # ifdef LOGIN_NEEDS_UTMPX
596 /* Do common processing for the child, such as execing the command. */
597 do_child(s, command);
602 cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
605 packet_disconnect("fork failed: %.100s", strerror(errno));
608 /* Parent. Close the slave side of the pseudo tty. */
612 * Create another descriptor of the pty master side for use as the
613 * standard input. We could use the original descriptor, but this
614 * simplifies code in server_loop. The descriptor is bidirectional.
618 packet_disconnect("dup #1 failed: %.100s", strerror(errno));
620 /* we keep a reference to the pty master */
621 ptymaster = dup(ptyfd);
623 packet_disconnect("dup #2 failed: %.100s", strerror(errno));
624 s->ptymaster = ptymaster;
626 /* Enter interactive session. */
627 packet_set_interactive(1);
629 session_set_fds(s, ptyfd, fdout, -1);
631 server_loop(pid, ptyfd, fdout, -1);
632 /* server_loop _has_ closed ptyfd and fdout. */
636 #ifdef LOGIN_NEEDS_UTMPX
638 do_pre_login(Session *s)
641 struct sockaddr_storage from;
642 pid_t pid = getpid();
645 * Get IP address of client. If the connection is not a socket, let
646 * the address be 0.0.0.0.
648 memset(&from, 0, sizeof(from));
649 if (packet_connection_is_on_socket()) {
650 fromlen = sizeof(from);
651 if (getpeername(packet_get_connection_in(),
652 (struct sockaddr *) & from, &fromlen) < 0) {
653 debug("getpeername: %.100s", strerror(errno));
658 record_utmp_only(pid, s->tty, s->pw->pw_name,
659 get_remote_name_or_ip(utmp_len, options.reverse_mapping_check),
660 (struct sockaddr *)&from);
665 * This is called to fork and execute a command. If another command is
666 * to be forced, execute that instead.
669 do_exec(Session *s, const char *command)
671 if (forced_command) {
672 original_command = command;
673 command = forced_command;
674 debug("Forced command '%.900s'", command);
678 do_exec_pty(s, command);
680 do_exec_no_pty(s, command);
682 original_command = NULL;
685 /* administrative, login(1)-like work */
687 do_login(Session *s, const char *command)
690 char hostname[MAXHOSTNAMELEN];
692 struct sockaddr_storage from;
693 time_t last_login_time;
694 struct passwd * pw = s->pw;
695 pid_t pid = getpid();
698 * Get IP address of client. If the connection is not a socket, let
699 * the address be 0.0.0.0.
701 memset(&from, 0, sizeof(from));
702 if (packet_connection_is_on_socket()) {
703 fromlen = sizeof(from);
704 if (getpeername(packet_get_connection_in(),
705 (struct sockaddr *) & from, &fromlen) < 0) {
706 debug("getpeername: %.100s", strerror(errno));
711 /* Get the time and hostname when the user last logged in. */
712 if (options.print_lastlog) {
714 last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name,
715 hostname, sizeof(hostname));
718 /* Record that there was a login on that tty from the remote host. */
719 record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
720 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
721 (struct sockaddr *)&from);
725 * If password change is needed, do it now.
726 * This needs to occur before the ~/.hushlogin check.
728 if (is_pam_password_change_required()) {
729 print_pam_messages();
734 if (check_quietlogin(s, command))
738 if (!is_pam_password_change_required())
739 print_pam_messages();
741 #ifdef WITH_AIXAUTHENTICATE
742 if (aixloginmsg && *aixloginmsg)
743 printf("%s\n", aixloginmsg);
744 #endif /* WITH_AIXAUTHENTICATE */
746 if (options.print_lastlog && last_login_time != 0) {
747 time_string = ctime(&last_login_time);
748 if (strchr(time_string, '\n'))
749 *strchr(time_string, '\n') = 0;
750 if (strcmp(hostname, "") == 0)
751 printf("Last login: %s\r\n", time_string);
753 printf("Last login: %s from %s\r\n", time_string, hostname);
760 * Display the message of the day.
768 if (options.print_motd) {
769 #ifdef HAVE_LOGIN_CAP
770 f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
773 f = fopen("/etc/motd", "r");
776 while (fgets(buf, sizeof(buf), f))
785 * Check for quiet login, either .hushlogin or command given.
788 check_quietlogin(Session *s, const char *command)
791 struct passwd *pw = s->pw;
794 /* Return 1 if .hushlogin exists or a command given. */
797 snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
798 #ifdef HAVE_LOGIN_CAP
799 if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
802 if (stat(buf, &st) >= 0)
809 * Sets the value of the given variable in the environment. If the variable
810 * already exists, its value is overriden.
813 child_set_env(char ***envp, u_int *envsizep, const char *name,
820 * Find the slot where the value should be stored. If the variable
821 * already exists, we reuse the slot; otherwise we append a new slot
822 * at the end of the array, expanding if necessary.
825 namelen = strlen(name);
826 for (i = 0; env[i]; i++)
827 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
830 /* Reuse the slot. */
833 /* New variable. Expand if necessary. */
834 if (i >= (*envsizep) - 1) {
836 env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
838 /* Need to set the NULL pointer at end of array beyond the new slot. */
842 /* Allocate space and format the variable in the appropriate slot. */
843 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
844 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
848 * Reads environment variables from the given file and adds/overrides them
849 * into the environment. If the file does not exist, this does nothing.
850 * Otherwise, it must consist of empty lines, comments (line starts with '#')
851 * and assignments of the form name=value. No other forms are allowed.
854 read_environment_file(char ***env, u_int *envsize,
855 const char *filename)
861 f = fopen(filename, "r");
865 while (fgets(buf, sizeof(buf), f)) {
866 for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
868 if (!*cp || *cp == '#' || *cp == '\n')
870 if (strchr(cp, '\n'))
871 *strchr(cp, '\n') = '\0';
872 value = strchr(cp, '=');
874 fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf);
878 * Replace the equals sign by nul, and advance value to
883 child_set_env(env, envsize, cp, value);
888 void copy_environment(char **source, char ***env, u_int *envsize)
890 char *var_name, *var_val;
896 for(i = 0; source[i] != NULL; i++) {
897 var_name = xstrdup(source[i]);
898 if ((var_val = strstr(var_name, "=")) == NULL) {
904 debug3("Copy environment: %s=%s", var_name, var_val);
905 child_set_env(env, envsize, var_name, var_val);
911 #if defined(HAVE_GETUSERATTR)
913 * AIX-specific login initialisation
915 void set_limit(char *user, char *soft, char *hard, int resource, int mult)
920 getrlimit(resource, &rlim);
923 if (getuserattr(user, soft, &slim, SEC_INT) != -1) {
925 rlim.rlim_cur = RLIM_INFINITY;
926 } else if (slim != 0) {
927 /* See the wackiness below */
928 if (rlim.rlim_cur == slim * mult)
931 rlim.rlim_cur = slim * mult;
936 if (getuserattr(user, hard, &hlim, SEC_INT) != -1) {
938 rlim.rlim_max = RLIM_INFINITY;
939 } else if (hlim != 0) {
940 rlim.rlim_max = hlim * mult;
945 * XXX For cpu and fsize the soft limit is set to the hard limit
946 * if the hard limit is left at its default value and the soft limit
947 * is changed from its default value, either by requesting it
948 * (slim == 0) or by setting it to the current default. At least
949 * that's how rlogind does it. If you're confused you're not alone.
950 * Bug or feature? AIX 4.3.1.2
952 if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu"))
953 && hlim == 0 && slim != 0)
954 rlim.rlim_max = rlim.rlim_cur;
955 /* A specified hard limit limits the soft limit */
956 else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max)
957 rlim.rlim_cur = rlim.rlim_max;
958 /* A soft limit can increase a hard limit */
959 else if (rlim.rlim_cur > rlim.rlim_max)
960 rlim.rlim_max = rlim.rlim_cur;
962 if (setrlimit(resource, &rlim) != 0)
963 error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno));
966 void set_limits_from_userattr(char *user)
971 set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512);
972 set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1);
973 set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512);
974 set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512);
975 set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512);
976 set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512);
977 #if defined(S_UNOFILE)
978 set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1);
981 if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) {
982 /* Convert decimal to octal */
983 (void) snprintf(buf, sizeof(buf), "%d", mask);
984 if (sscanf(buf, "%o", &mask) == 1)
988 #endif /* defined(HAVE_GETUSERATTR) */
991 * Performs common processing for the child, such as setting up the
992 * environment, closing extra file descriptors, setting the user and group
993 * ids, and executing the command or shell.
996 do_child(Session *s, const char *command)
998 const char *shell, *hostname = NULL, *cp = NULL;
999 struct passwd *pw = s->pw;
1005 extern char **environ;
1009 #ifdef WITH_IRIX_PROJECT
1011 #endif /* WITH_IRIX_PROJECT */
1012 #ifdef WITH_IRIX_JOBS
1015 #ifdef WITH_IRIX_ARRAY
1017 #endif /* WITH_IRIX_ARRAY */
1018 #endif /* WITH_IRIX_JOBS */
1021 s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
1023 /* remove hostkey from the child's memory */
1024 destroy_sensitive_data();
1026 /* login(1) is only called if we execute the login shell */
1027 if (options.use_login && command != NULL)
1028 options.use_login = 0;
1030 #if !defined(HAVE_OSF_SIA)
1031 if (!options.use_login) {
1032 # ifdef HAVE_LOGIN_CAP
1033 if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
1034 f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
1035 _PATH_NOLOGIN), "r");
1036 # else /* HAVE_LOGIN_CAP */
1038 f = fopen(_PATH_NOLOGIN, "r");
1039 # endif /* HAVE_LOGIN_CAP */
1041 /* /etc/nologin exists. Print its contents and exit. */
1042 while (fgets(buf, sizeof(buf), f))
1048 #endif /* HAVE_OSF_SIA */
1050 /* Set login name, uid, gid, and groups. */
1051 /* Login(1) does this as well, and it needs uid 0 for the "-h"
1052 switch, so we let login(1) to this for us. */
1053 if (!options.use_login) {
1055 session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty);
1056 if (!check_quietlogin(s, command))
1058 #else /* HAVE_OSF_SIA */
1062 if (getuid() == 0 || geteuid() == 0) {
1064 # ifdef HAVE_GETUSERATTR
1065 set_limits_from_userattr(pw->pw_name);
1066 # endif /* HAVE_GETUSERATTR */
1067 # ifdef HAVE_LOGIN_CAP
1068 if (setusercontext(lc, pw, pw->pw_uid,
1069 (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
1070 perror("unable to set user context");
1073 # else /* HAVE_LOGIN_CAP */
1074 #if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
1075 /* Sets login uid for accounting */
1076 if (getluid() == -1 && setluid(pw->pw_uid) == -1)
1077 error("setluid: %s", strerror(errno));
1078 #endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
1080 if (setlogin(pw->pw_name) < 0)
1081 error("setlogin failed: %s", strerror(errno));
1082 if (setgid(pw->pw_gid) < 0) {
1086 /* Initialize the group list. */
1087 if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1088 perror("initgroups");
1094 * PAM credentials may take the form of
1095 * supplementary groups. These will have been
1096 * wiped by the above initgroups() call.
1097 * Reestablish them here.
1100 # endif /* USE_PAM */
1101 # ifdef WITH_IRIX_JOBS
1102 jid = jlimit_startjob(pw->pw_name, pw->pw_uid, "interactive");
1104 fatal("Failed to create job container: %.100s",
1107 # endif /* WITH_IRIX_JOBS */
1108 # ifdef WITH_IRIX_ARRAY
1109 /* initialize array session */
1111 if (newarraysess() != 0)
1112 fatal("Failed to set up new array session: %.100s",
1115 # endif /* WITH_IRIX_ARRAY */
1116 # ifdef WITH_IRIX_PROJECT
1117 /* initialize irix project info */
1118 if ((projid = getdfltprojuser(pw->pw_name)) == -1) {
1119 debug("Failed to get project id, using projid 0");
1122 if (setprid(projid))
1123 fatal("Failed to initialize project %d for %s: %.100s",
1124 (int)projid, pw->pw_name, strerror(errno));
1125 # endif /* WITH_IRIX_PROJECT */
1126 #ifdef WITH_IRIX_AUDIT
1127 if (sysconf(_SC_AUDIT)) {
1128 debug("Setting sat id to %d", (int) pw->pw_uid);
1129 if (satsetid(pw->pw_uid))
1130 debug("error setting satid: %.100s", strerror(errno));
1132 #endif /* WITH_IRIX_AUDIT */
1136 * AIX has a "usrinfo" area where logname and
1137 * other stuff is stored - a few applications
1138 * actually use this and die if it's not set
1142 cp = xmalloc(22 + strlen(s->tty) +
1143 2 * strlen(pw->pw_name));
1144 i = sprintf(cp, "LOGNAME=%s%cNAME=%s%cTTY=%s%c%c",
1145 pw->pw_name, 0, pw->pw_name, 0, s->tty, 0, 0);
1146 if (usrinfo(SETUINFO, cp, i) == -1)
1147 fatal("Couldn't set usrinfo: %s",
1149 debug3("AIX/UsrInfo: set len %d", i);
1153 /* Permanently switch to the desired uid. */
1154 permanently_set_uid(pw);
1155 # endif /* HAVE_LOGIN_CAP */
1157 #endif /* HAVE_OSF_SIA */
1162 if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1163 fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1166 * Get the shell from the password data. An empty shell field is
1167 * legal, and means /bin/sh.
1169 shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1170 #ifdef HAVE_LOGIN_CAP
1171 shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1174 /* Initialize the environment. */
1176 env = xmalloc(envsize * sizeof(char *));
1181 * The Windows environment contains some setting which are
1182 * important for a running system. They must not be dropped.
1184 copy_environment(environ, &env, &envsize);
1187 if (!options.use_login) {
1188 /* Set basic environment. */
1189 child_set_env(&env, &envsize, "USER", pw->pw_name);
1190 child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
1191 child_set_env(&env, &envsize, "HOME", pw->pw_dir);
1192 #ifdef HAVE_LOGIN_CAP
1193 (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH);
1194 child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1195 #else /* HAVE_LOGIN_CAP */
1196 # ifndef HAVE_CYGWIN
1198 * There's no standard path on Windows. The path contains
1199 * important components pointing to the system directories,
1200 * needed for loading shared libraries. So the path better
1201 * remains intact here.
1203 child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1204 # endif /* HAVE_CYGWIN */
1205 #endif /* HAVE_LOGIN_CAP */
1207 snprintf(buf, sizeof buf, "%.200s/%.50s",
1208 _PATH_MAILDIR, pw->pw_name);
1209 child_set_env(&env, &envsize, "MAIL", buf);
1211 /* Normal systems set SHELL by default. */
1212 child_set_env(&env, &envsize, "SHELL", shell);
1215 child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1217 /* Set custom environment options from RSA authentication. */
1218 if (!options.use_login) {
1219 while (custom_environment) {
1220 struct envstring *ce = custom_environment;
1223 for (i = 0; s[i] != '=' && s[i]; i++)
1227 child_set_env(&env, &envsize, s, s + i + 1);
1229 custom_environment = ce->next;
1235 snprintf(buf, sizeof buf, "%.50s %d %d",
1236 get_remote_ipaddr(), get_remote_port(), get_local_port());
1237 child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1240 child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1242 child_set_env(&env, &envsize, "TERM", s->term);
1244 child_set_env(&env, &envsize, "DISPLAY", s->display);
1245 if (original_command)
1246 child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
1250 if ((cp = getenv("AUTHSTATE")) != NULL)
1251 child_set_env(&env, &envsize, "AUTHSTATE", cp);
1252 if ((cp = getenv("KRB5CCNAME")) != NULL)
1253 child_set_env(&env, &envsize, "KRB5CCNAME", cp);
1254 read_environment_file(&env, &envsize, "/etc/environment");
1257 if (s->authctxt->krb4_ticket_file)
1258 child_set_env(&env, &envsize, "KRBTKFILE",
1259 s->authctxt->krb4_ticket_file);
1262 if (s->authctxt->krb5_ticket_file)
1263 child_set_env(&env, &envsize, "KRB5CCNAME",
1264 s->authctxt->krb5_ticket_file);
1267 /* Pull in any environment variables that may have been set by PAM. */
1268 copy_environment(fetch_pam_environment(), &env, &envsize);
1269 #endif /* USE_PAM */
1271 if (auth_get_socket_name() != NULL)
1272 child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1273 auth_get_socket_name());
1275 /* read $HOME/.ssh/environment. */
1276 if (!options.use_login) {
1277 snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
1279 read_environment_file(&env, &envsize, buf);
1282 /* dump the environment */
1283 fprintf(stderr, "Environment:\n");
1284 for (i = 0; env[i]; i++)
1285 fprintf(stderr, " %.200s\n", env[i]);
1287 /* we have to stash the hostname before we close our socket. */
1288 if (options.use_login)
1289 hostname = get_remote_name_or_ip(utmp_len,
1290 options.verify_reverse_mapping);
1292 * Close the connection descriptors; note that this is the child, and
1293 * the server will still have the socket open, and it is important
1294 * that we do not shutdown it. Note that the descriptors cannot be
1295 * closed before building the environment, as we call
1296 * get_remote_ipaddr there.
1298 if (packet_get_connection_in() == packet_get_connection_out())
1299 close(packet_get_connection_in());
1301 close(packet_get_connection_in());
1302 close(packet_get_connection_out());
1305 * Close all descriptors related to channels. They will still remain
1306 * open in the parent.
1308 /* XXX better use close-on-exec? -markus */
1309 channel_close_all();
1312 * Close any extra file descriptors. Note that there may still be
1313 * descriptors left by system functions. They will be closed later.
1318 * Close any extra open file descriptors so that we don\'t have them
1319 * hanging around in clients. Note that we want to do this after
1320 * initgroups, because at least on Solaris 2.3 it leaves file
1323 for (i = 3; i < 64; i++)
1327 * Must take new environment into use so that .ssh/rc, /etc/sshrc and
1328 * xauth are run in the proper environment.
1333 /* Try to get AFS tokens for the local cell. */
1337 if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1338 krb_afslog(cell, 0);
1344 /* Change current directory to the user\'s home directory. */
1345 if (chdir(pw->pw_dir) < 0) {
1346 fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1347 pw->pw_dir, strerror(errno));
1348 #ifdef HAVE_LOGIN_CAP
1349 if (login_getcapbool(lc, "requirehome", 0))
1355 * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first
1358 if (!options.use_login) {
1359 /* ignore _PATH_SSH_USER_RC for subsystems */
1360 if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
1361 snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
1362 shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
1364 fprintf(stderr, "Running %s\n", cmd);
1365 f = popen(cmd, "w");
1368 fprintf(f, "%s %s\n", s->auth_proto,
1372 fprintf(stderr, "Could not run %s\n",
1374 } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
1376 fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
1377 _PATH_SSH_SYSTEM_RC);
1378 f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
1381 fprintf(f, "%s %s\n", s->auth_proto,
1385 fprintf(stderr, "Could not run %s\n",
1386 _PATH_SSH_SYSTEM_RC);
1387 } else if (do_xauth && options.xauth_location != NULL) {
1388 /* Add authority data to .Xauthority if appropriate. */
1391 "Running %.100s add "
1392 "%.100s %.100s %.100s\n",
1393 options.xauth_location, s->auth_display,
1394 s->auth_proto, s->auth_data);
1396 snprintf(cmd, sizeof cmd, "%s -q -",
1397 options.xauth_location);
1398 f = popen(cmd, "w");
1400 fprintf(f, "add %s %s %s\n",
1401 s->auth_display, s->auth_proto,
1405 fprintf(stderr, "Could not run %s\n",
1409 /* Get the last component of the shell name. */
1410 cp = strrchr(shell, '/');
1417 /* restore SIGPIPE for child */
1418 signal(SIGPIPE, SIG_DFL);
1421 * If we have no command, execute the shell. In this case, the shell
1422 * name to be passed in argv[0] is preceded by '-' to indicate that
1423 * this is a login shell.
1426 if (!options.use_login) {
1429 /* Start the shell. Set initial character to '-'. */
1431 strlcpy(buf + 1, cp, sizeof(buf) - 1);
1433 /* Execute the shell. */
1436 execve(shell, argv, env);
1438 /* Executing the shell failed. */
1443 /* Launch login(1). */
1445 execl(LOGIN_PROGRAM, "login", "-h", hostname,
1446 #ifdef LOGIN_NEEDS_TERM
1447 s->term? s->term : "unknown",
1449 "-p", "-f", "--", pw->pw_name, (char *)NULL);
1451 /* Login couldn't be executed, die. */
1458 * Execute the command using the user's shell. This uses the -c
1459 * option to execute the command.
1461 argv[0] = (char *) cp;
1463 argv[2] = (char *) command;
1465 execve(shell, argv, env);
1474 static int did_init = 0;
1476 debug("session_new: init");
1477 for (i = 0; i < MAX_SESSIONS; i++) {
1478 sessions[i].used = 0;
1482 for (i = 0; i < MAX_SESSIONS; i++) {
1483 Session *s = &sessions[i];
1485 memset(s, 0, sizeof(*s));
1491 debug("session_new: session %d", i);
1502 for (i = 0; i < MAX_SESSIONS; i++) {
1503 Session *s = &sessions[i];
1504 debug("dump: used %d session %d %p channel %d pid %d",
1514 session_open(Authctxt *authctxt, int chanid)
1516 Session *s = session_new();
1517 debug("session_open: channel %d", chanid);
1519 error("no more sessions");
1522 s->authctxt = authctxt;
1523 s->pw = authctxt->pw;
1525 fatal("no user for session %d", s->self);
1526 debug("session_open: session %d: link with channel %d", s->self, chanid);
1532 session_by_channel(int id)
1535 for (i = 0; i < MAX_SESSIONS; i++) {
1536 Session *s = &sessions[i];
1537 if (s->used && s->chanid == id) {
1538 debug("session_by_channel: session %d channel %d", i, id);
1542 debug("session_by_channel: unknown channel %d", id);
1548 session_by_pid(pid_t pid)
1551 debug("session_by_pid: pid %d", pid);
1552 for (i = 0; i < MAX_SESSIONS; i++) {
1553 Session *s = &sessions[i];
1554 if (s->used && s->pid == pid)
1557 error("session_by_pid: unknown pid %d", pid);
1563 session_window_change_req(Session *s)
1565 s->col = packet_get_int();
1566 s->row = packet_get_int();
1567 s->xpixel = packet_get_int();
1568 s->ypixel = packet_get_int();
1570 pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1575 session_pty_req(Session *s)
1581 debug("Allocating a pty not permitted for this authentication.");
1584 if (s->ttyfd != -1) {
1585 packet_disconnect("Protocol error: you already have a pty.");
1589 s->term = packet_get_string(&len);
1592 s->col = packet_get_int();
1593 s->row = packet_get_int();
1595 s->row = packet_get_int();
1596 s->col = packet_get_int();
1598 s->xpixel = packet_get_int();
1599 s->ypixel = packet_get_int();
1601 if (strcmp(s->term, "") == 0) {
1606 /* Allocate a pty and open it. */
1607 debug("Allocating pty.");
1608 if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) {
1614 error("session_pty_req: session %d alloc failed", s->self);
1617 debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1619 /* for SSH1 the tty modes length is not given */
1621 n_bytes = packet_remaining();
1622 tty_parse_modes(s->ttyfd, &n_bytes);
1625 * Add a cleanup function to clear the utmp entry and record logout
1626 * time in case we call fatal() (e.g., the connection gets closed).
1628 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 log("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 log("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_auth_agent_req(Session *s)
1718 static int called = 0;
1720 if (no_agent_forwarding_flag) {
1721 debug("session_auth_agent_req: no_agent_forwarding_flag");
1728 return auth_input_request_forwarding(s->pw);
1733 session_input_channel_req(Channel *c, const char *rtype)
1738 if ((s = session_by_channel(c->self)) == NULL) {
1739 log("session_input_channel_req: no session %d req %.100s",
1743 debug("session_input_channel_req: session %d req %s", s->self, rtype);
1746 * a session is in LARVAL state until a shell, a command
1747 * or a subsystem is executed
1749 if (c->type == SSH_CHANNEL_LARVAL) {
1750 if (strcmp(rtype, "shell") == 0) {
1751 success = session_shell_req(s);
1752 } else if (strcmp(rtype, "exec") == 0) {
1753 success = session_exec_req(s);
1754 } else if (strcmp(rtype, "pty-req") == 0) {
1755 success = session_pty_req(s);
1756 } else if (strcmp(rtype, "x11-req") == 0) {
1757 success = session_x11_req(s);
1758 } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1759 success = session_auth_agent_req(s);
1760 } else if (strcmp(rtype, "subsystem") == 0) {
1761 success = session_subsystem_req(s);
1764 if (strcmp(rtype, "window-change") == 0) {
1765 success = session_window_change_req(s);
1771 session_set_fds(Session *s, int fdin, int fdout, int fderr)
1774 fatal("session_set_fds: called for proto != 2.0");
1776 * now that have a child and a pipe to the child,
1777 * we can activate our channel and register the fd's
1779 if (s->chanid == -1)
1780 fatal("no channel for session %d", s->self);
1781 channel_set_fds(s->chanid,
1783 fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1788 * Function to perform pty cleanup. Also called if we get aborted abnormally
1789 * (e.g., due to a dropped connection).
1792 session_pty_cleanup(void *session)
1794 Session *s = session;
1797 error("session_pty_cleanup: no session");
1803 debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1805 /* Record that the user has logged out. */
1807 record_logout(s->pid, s->tty);
1809 /* Release the pseudo-tty. */
1810 pty_release(s->tty);
1813 * Close the server side of the socket pairs. We must do this after
1814 * the pty cleanup, so that another process doesn't get this pty
1815 * while we're still cleaning up.
1817 if (close(s->ptymaster) < 0)
1818 error("close(s->ptymaster): %s", strerror(errno));
1820 /* unlink pty from session */
1825 session_exit_message(Session *s, int status)
1829 fatal("session_close: no session");
1830 c = channel_lookup(s->chanid);
1832 fatal("session_exit_message: session %d: no channel %d",
1833 s->self, s->chanid);
1834 debug("session_exit_message: session %d channel %d pid %d",
1835 s->self, s->chanid, s->pid);
1837 if (WIFEXITED(status)) {
1838 channel_request_start(s->chanid,
1840 packet_put_int(WEXITSTATUS(status));
1842 } else if (WIFSIGNALED(status)) {
1843 channel_request_start(s->chanid,
1845 packet_put_int(WTERMSIG(status));
1847 packet_put_char(WCOREDUMP(status));
1848 #else /* WCOREDUMP */
1850 #endif /* WCOREDUMP */
1851 packet_put_cstring("");
1852 packet_put_cstring("");
1855 /* Some weird exit cause. Just exit. */
1856 packet_disconnect("wait returned status %04x.", status);
1859 /* disconnect channel */
1860 debug("session_exit_message: release channel %d", s->chanid);
1861 channel_cancel_cleanup(s->chanid);
1863 * emulate a write failure with 'chan_write_failed', nobody will be
1864 * interested in data we write.
1865 * Note that we must not call 'chan_read_failed', since there could
1866 * be some more data waiting in the pipe.
1868 if (c->ostate != CHAN_OUTPUT_CLOSED)
1869 chan_write_failed(c);
1874 session_close(Session *s)
1876 debug("session_close: session %d pid %d", s->self, s->pid);
1877 if (s->ttyfd != -1) {
1878 fatal_remove_cleanup(session_pty_cleanup, (void *)s);
1879 session_pty_cleanup(s);
1885 if (s->auth_display)
1886 xfree(s->auth_display);
1888 xfree(s->auth_data);
1890 xfree(s->auth_proto);
1892 session_proctitle(s);
1896 session_close_by_pid(pid_t pid, int status)
1898 Session *s = session_by_pid(pid);
1900 debug("session_close_by_pid: no session for pid %d", pid);
1903 if (s->chanid != -1)
1904 session_exit_message(s, status);
1909 * this is called when a channel dies before
1910 * the session 'child' itself dies
1913 session_close_by_channel(int id, void *arg)
1915 Session *s = session_by_channel(id);
1917 debug("session_close_by_channel: no session for id %d", id);
1920 debug("session_close_by_channel: channel %d child %d", id, s->pid);
1922 debug("session_close_by_channel: channel %d: has child", id);
1924 * delay detach of session, but release pty, since
1925 * the fd's to the child are already closed
1927 if (s->ttyfd != -1) {
1928 fatal_remove_cleanup(session_pty_cleanup, (void *)s);
1929 session_pty_cleanup(s);
1933 /* detach by removing callback */
1934 channel_cancel_cleanup(s->chanid);
1940 session_destroy_all(void)
1943 for (i = 0; i < MAX_SESSIONS; i++) {
1944 Session *s = &sessions[i];
1951 session_tty_list(void)
1953 static char buf[1024];
1956 for (i = 0; i < MAX_SESSIONS; i++) {
1957 Session *s = &sessions[i];
1958 if (s->used && s->ttyfd != -1) {
1960 strlcat(buf, ",", sizeof buf);
1961 strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1965 strlcpy(buf, "notty", sizeof buf);
1970 session_proctitle(Session *s)
1973 error("no user for session %d", s->self);
1975 setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1979 session_setup_x11fwd(Session *s)
1982 char display[512], auth_display[512];
1983 char hostname[MAXHOSTNAMELEN];
1985 if (no_x11_forwarding_flag) {
1986 packet_send_debug("X11 forwarding disabled in user configuration file.");
1989 if (!options.x11_forwarding) {
1990 debug("X11 forwarding disabled in server configuration file.");
1993 if (!options.xauth_location ||
1994 (stat(options.xauth_location, &st) == -1)) {
1995 packet_send_debug("No xauth program; cannot forward with spoofing.");
1998 if (options.use_login) {
1999 packet_send_debug("X11 forwarding disabled; "
2000 "not compatible with UseLogin=yes.");
2003 if (s->display != NULL) {
2004 debug("X11 display already set.");
2007 s->display_number = x11_create_display_inet(options.x11_display_offset,
2008 options.x11_use_localhost, s->single_connection);
2009 if (s->display_number == -1) {
2010 debug("x11_create_display_inet failed.");
2014 /* Set up a suitable value for the DISPLAY variable. */
2015 if (gethostname(hostname, sizeof(hostname)) < 0)
2016 fatal("gethostname: %.100s", strerror(errno));
2018 * auth_display must be used as the displayname when the
2019 * authorization entry is added with xauth(1). This will be
2020 * different than the DISPLAY string for localhost displays.
2022 if (options.x11_use_localhost) {
2023 snprintf(display, sizeof display, "localhost:%d.%d",
2024 s->display_number, s->screen);
2025 snprintf(auth_display, sizeof auth_display, "unix:%d.%d",
2026 s->display_number, s->screen);
2027 s->display = xstrdup(display);
2028 s->auth_display = xstrdup(auth_display);
2030 #ifdef IPADDR_IN_DISPLAY
2032 struct in_addr my_addr;
2034 he = gethostbyname(hostname);
2036 error("Can't get IP address for X11 DISPLAY.");
2037 packet_send_debug("Can't get IP address for X11 DISPLAY.");
2040 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
2041 snprintf(display, sizeof display, "%.50s:%d.%d", inet_ntoa(my_addr),
2042 s->display_number, s->screen);
2044 snprintf(display, sizeof display, "%.400s:%d.%d", hostname,
2045 s->display_number, s->screen);
2047 s->display = xstrdup(display);
2048 s->auth_display = xstrdup(display);
2055 do_authenticated2(Authctxt *authctxt)
2057 server_loop2(authctxt);