Annotation of src/usr.bin/ssh/session.c, Revision 1.177
1.1 markus 1: /*
2: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
3: * All rights reserved
1.37 deraadt 4: *
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".
10: *
1.2 markus 11: * SSH2 support by Markus Friedl.
1.95 markus 12: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
1.37 deraadt 13: *
14: * Redistribution and use in source and binary forms, with or without
15: * modification, are permitted provided that the following conditions
16: * are met:
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.
22: *
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.
1.2 markus 33: */
1.1 markus 34:
35: #include "includes.h"
1.177 ! djm 36: RCSID("$OpenBSD: session.c,v 1.176 2004/06/21 17:53:03 djm Exp $");
1.1 markus 37:
1.51 markus 38: #include "ssh.h"
39: #include "ssh1.h"
40: #include "ssh2.h"
1.1 markus 41: #include "xmalloc.h"
1.59 djm 42: #include "sshpty.h"
1.1 markus 43: #include "packet.h"
44: #include "buffer.h"
1.173 djm 45: #include "match.h"
1.1 markus 46: #include "uidswap.h"
47: #include "compat.h"
1.78 markus 48: #include "channels.h"
1.2 markus 49: #include "bufaux.h"
50: #include "auth.h"
1.19 markus 51: #include "auth-options.h"
1.50 markus 52: #include "pathnames.h"
1.51 markus 53: #include "log.h"
54: #include "servconf.h"
1.59 djm 55: #include "sshlogin.h"
1.51 markus 56: #include "serverloop.h"
57: #include "canohost.h"
1.55 itojun 58: #include "session.h"
1.130 provos 59: #include "monitor_wrap.h"
1.171 markus 60:
61: #ifdef KRB5
62: #include <kafs.h>
63: #endif
1.1 markus 64:
1.161 markus 65: #ifdef GSSAPI
66: #include "ssh-gss.h"
67: #endif
68:
1.1 markus 69: /* func */
70:
71: Session *session_new(void);
1.94 itojun 72: void session_set_fds(Session *, int, int, int);
1.165 markus 73: void session_pty_cleanup(Session *);
1.94 itojun 74: void session_proctitle(Session *);
75: int session_setup_x11fwd(Session *);
76: void do_exec_pty(Session *, const char *);
77: void do_exec_no_pty(Session *, const char *);
78: void do_exec(Session *, const char *);
79: void do_login(Session *, const char *);
80: void do_child(Session *, const char *);
1.73 djm 81: void do_motd(void);
1.94 itojun 82: int check_quietlogin(Session *, const char *);
1.1 markus 83:
1.94 itojun 84: static void do_authenticated1(Authctxt *);
85: static void do_authenticated2(Authctxt *);
86:
87: static int session_pty_req(Session *);
1.65 markus 88:
1.1 markus 89: /* import */
90: extern ServerOptions options;
91: extern char *__progname;
92: extern int log_stderr;
93: extern int debug_flag;
1.45 markus 94: extern u_int utmp_len;
1.21 markus 95: extern int startup_pipe;
1.74 markus 96: extern void destroy_sensitive_data(void);
1.21 markus 97:
1.34 markus 98: /* original command from peer. */
1.92 markus 99: const char *original_command = NULL;
1.34 markus 100:
1.1 markus 101: /* data */
102: #define MAX_SESSIONS 10
103: Session sessions[MAX_SESSIONS];
104:
1.28 millert 105: #ifdef HAVE_LOGIN_CAP
1.129 provos 106: login_cap_t *lc;
1.28 millert 107: #endif
108:
1.165 markus 109: static int is_child = 0;
110:
1.136 markus 111: /* Name and directory of socket for authentication agent forwarding. */
112: static char *auth_sock_name = NULL;
113: static char *auth_sock_dir = NULL;
114:
115: /* removes the agent forwarding socket */
116:
117: static void
1.165 markus 118: auth_sock_cleanup_proc(struct passwd *pw)
1.136 markus 119: {
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;
125: restore_uid();
126: }
127: }
128:
129: static int
130: auth_input_request_forwarding(struct passwd * pw)
131: {
132: Channel *nc;
133: int sock;
134: struct sockaddr_un sunaddr;
135:
136: if (auth_sock_name != NULL) {
137: error("authentication forwarding requested twice.");
138: return 0;
139: }
140:
141: /* Temporarily drop privileged uid for mkdir/bind. */
142: temporarily_use_uid(pw);
143:
144: /* Allocate a buffer for the socket name, and format the name. */
145: auth_sock_name = xmalloc(MAXPATHLEN);
146: auth_sock_dir = xmalloc(MAXPATHLEN);
1.166 markus 147: strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
1.136 markus 148:
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));
153: restore_uid();
154: xfree(auth_sock_name);
155: xfree(auth_sock_dir);
156: auth_sock_name = NULL;
157: auth_sock_dir = NULL;
158: return 0;
159: }
1.137 mpech 160: snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld",
161: auth_sock_dir, (long) getpid());
1.136 markus 162:
163: /* Create the socket. */
164: sock = socket(AF_UNIX, SOCK_STREAM, 0);
165: if (sock < 0)
166: packet_disconnect("socket: %.100s", strerror(errno));
167:
168: /* Bind it to the name. */
169: memset(&sunaddr, 0, sizeof(sunaddr));
170: sunaddr.sun_family = AF_UNIX;
171: strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
172:
173: if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
174: packet_disconnect("bind: %.100s", strerror(errno));
175:
176: /* Restore the privileged uid. */
177: restore_uid();
178:
179: /* Start listening on the socket. */
1.169 markus 180: if (listen(sock, SSH_LISTEN_BACKLOG) < 0)
1.136 markus 181: packet_disconnect("listen: %.100s", strerror(errno));
182:
183: /* Allocate a channel for the authentication agent socket. */
184: nc = channel_new("auth socket",
185: SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
186: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1.156 markus 187: 0, "auth socket", 1);
1.136 markus 188: strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
189: return 1;
190: }
191:
192:
1.65 markus 193: void
194: do_authenticated(Authctxt *authctxt)
195: {
1.153 markus 196: setproctitle("%s", authctxt->pw->pw_name);
197:
1.65 markus 198: /*
199: * Cancel the alarm we set to limit the time taken for
200: * authentication.
201: */
202: alarm(0);
203: if (startup_pipe != -1) {
204: close(startup_pipe);
205: startup_pipe = -1;
206: }
207: /* setup the channel layer */
208: if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
209: channel_permit_all_opens();
210:
211: if (compat20)
212: do_authenticated2(authctxt);
213: else
214: do_authenticated1(authctxt);
1.79 markus 215:
1.165 markus 216: do_cleanup(authctxt);
1.65 markus 217: }
218:
1.1 markus 219: /*
220: * Prepares for an interactive session. This is called after the user has
221: * been successfully authenticated. During this message exchange, pseudo
222: * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
223: * are requested, etc.
224: */
1.94 itojun 225: static void
1.65 markus 226: do_authenticated1(Authctxt *authctxt)
1.1 markus 227: {
228: Session *s;
1.65 markus 229: char *command;
1.117 markus 230: int success, type, screen_flag;
1.139 deraadt 231: int enable_compression_after_reply = 0;
232: u_int proto_len, data_len, dlen, compression_level = 0;
1.1 markus 233:
1.61 markus 234: s = session_new();
1.96 dugsong 235: s->authctxt = authctxt;
1.65 markus 236: s->pw = authctxt->pw;
1.28 millert 237:
1.1 markus 238: /*
239: * We stay in this loop until the client requests to execute a shell
240: * or a command.
241: */
242: for (;;) {
1.65 markus 243: success = 0;
1.1 markus 244:
245: /* Get a packet from the client. */
1.117 markus 246: type = packet_read();
1.1 markus 247:
248: /* Process the packet. */
249: switch (type) {
250: case SSH_CMSG_REQUEST_COMPRESSION:
251: compression_level = packet_get_int();
1.116 markus 252: packet_check_eom();
1.1 markus 253: if (compression_level < 1 || compression_level > 9) {
254: packet_send_debug("Received illegal compression level %d.",
1.112 deraadt 255: compression_level);
1.138 markus 256: break;
257: }
258: if (!options.compression) {
259: debug2("compression disabled");
1.1 markus 260: break;
261: }
262: /* Enable compression after we have responded with SUCCESS. */
263: enable_compression_after_reply = 1;
264: success = 1;
265: break;
266:
267: case SSH_CMSG_REQUEST_PTY:
1.86 markus 268: success = session_pty_req(s);
1.1 markus 269: break;
270:
271: case SSH_CMSG_X11_REQUEST_FORWARDING:
272: s->auth_proto = packet_get_string(&proto_len);
273: s->auth_data = packet_get_string(&data_len);
274:
1.57 markus 275: screen_flag = packet_get_protocol_flags() &
276: SSH_PROTOFLAG_SCREEN_NUMBER;
277: debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
278:
279: if (packet_remaining() == 4) {
280: if (!screen_flag)
281: debug2("Buggy client: "
282: "X11 screen flag missing");
1.1 markus 283: s->screen = packet_get_int();
1.56 markus 284: } else {
1.1 markus 285: s->screen = 0;
1.56 markus 286: }
1.116 markus 287: packet_check_eom();
1.81 markus 288: success = session_setup_x11fwd(s);
289: if (!success) {
290: xfree(s->auth_proto);
291: xfree(s->auth_data);
1.84 markus 292: s->auth_proto = NULL;
293: s->auth_data = NULL;
1.1 markus 294: }
295: break;
296:
297: case SSH_CMSG_AGENT_REQUEST_FORWARDING:
298: if (no_agent_forwarding_flag || compat13) {
299: debug("Authentication agent forwarding not permitted for this authentication.");
300: break;
301: }
302: debug("Received authentication agent forwarding request.");
1.65 markus 303: success = auth_input_request_forwarding(s->pw);
1.1 markus 304: break;
305:
306: case SSH_CMSG_PORT_FORWARD_REQUEST:
307: if (no_port_forwarding_flag) {
308: debug("Port forwarding not permitted for this authentication.");
1.39 markus 309: break;
310: }
311: if (!options.allow_tcp_forwarding) {
312: debug("Port forwarding not permitted.");
1.1 markus 313: break;
314: }
315: debug("Received TCP/IP port forwarding request.");
1.65 markus 316: channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
1.1 markus 317: success = 1;
318: break;
319:
320: case SSH_CMSG_MAX_PACKET_SIZE:
321: if (packet_set_maxsize(packet_get_int()) > 0)
322: success = 1;
323: break;
324:
325: case SSH_CMSG_EXEC_SHELL:
326: case SSH_CMSG_EXEC_CMD:
327: if (type == SSH_CMSG_EXEC_CMD) {
328: command = packet_get_string(&dlen);
329: debug("Exec command '%.500s'", command);
1.92 markus 330: do_exec(s, command);
331: xfree(command);
1.1 markus 332: } else {
1.92 markus 333: do_exec(s, NULL);
1.1 markus 334: }
1.116 markus 335: packet_check_eom();
1.82 markus 336: session_close(s);
1.1 markus 337: return;
338:
339: default:
340: /*
341: * Any unknown messages in this phase are ignored,
342: * and a failure message is returned.
343: */
1.155 itojun 344: logit("Unknown packet type received after authentication: %d", type);
1.1 markus 345: }
346: packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
347: packet_send();
348: packet_write_wait();
349:
350: /* Enable compression now that we have replied if appropriate. */
351: if (enable_compression_after_reply) {
352: enable_compression_after_reply = 0;
353: packet_start_compression(compression_level);
354: }
355: }
356: }
357:
358: /*
359: * This is called to fork and execute a command when we have no tty. This
360: * will call do_child from the child, and server_loop from the parent after
361: * setting up file descriptors and such.
362: */
1.4 markus 363: void
1.63 markus 364: do_exec_no_pty(Session *s, const char *command)
1.1 markus 365: {
1.137 mpech 366: pid_t pid;
1.1 markus 367:
368: #ifdef USE_PIPES
369: int pin[2], pout[2], perr[2];
370: /* Allocate pipes for communicating with the program. */
371: if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
372: packet_disconnect("Could not create pipes: %.100s",
373: strerror(errno));
374: #else /* USE_PIPES */
375: int inout[2], err[2];
376: /* Uses socket pairs to communicate with the program. */
377: if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
378: socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
379: packet_disconnect("Could not create socket pairs: %.100s",
380: strerror(errno));
381: #endif /* USE_PIPES */
382: if (s == NULL)
383: fatal("do_exec_no_pty: no session");
384:
1.9 markus 385: session_proctitle(s);
1.1 markus 386:
387: /* Fork the child. */
388: if ((pid = fork()) == 0) {
1.165 markus 389: is_child = 1;
1.144 markus 390:
1.1 markus 391: /* Child. Reinitialize the log since the pid has changed. */
392: log_init(__progname, options.log_level, options.log_facility, log_stderr);
393:
394: /*
395: * Create a new session and process group since the 4.4BSD
396: * setlogin() affects the entire process group.
397: */
398: if (setsid() < 0)
399: error("setsid failed: %.100s", strerror(errno));
400:
401: #ifdef USE_PIPES
402: /*
403: * Redirect stdin. We close the parent side of the socket
404: * pair, and make the child side the standard input.
405: */
406: close(pin[1]);
407: if (dup2(pin[0], 0) < 0)
408: perror("dup2 stdin");
409: close(pin[0]);
410:
411: /* Redirect stdout. */
412: close(pout[0]);
413: if (dup2(pout[1], 1) < 0)
414: perror("dup2 stdout");
415: close(pout[1]);
416:
417: /* Redirect stderr. */
418: close(perr[0]);
419: if (dup2(perr[1], 2) < 0)
420: perror("dup2 stderr");
421: close(perr[1]);
422: #else /* USE_PIPES */
423: /*
424: * Redirect stdin, stdout, and stderr. Stdin and stdout will
425: * use the same socket, as some programs (particularly rdist)
426: * seem to depend on it.
427: */
428: close(inout[1]);
429: close(err[1]);
430: if (dup2(inout[0], 0) < 0) /* stdin */
431: perror("dup2 stdin");
432: if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
433: perror("dup2 stdout");
434: if (dup2(err[0], 2) < 0) /* stderr */
435: perror("dup2 stderr");
436: #endif /* USE_PIPES */
437:
438: /* Do processing for the child (exec command etc). */
1.60 markus 439: do_child(s, command);
1.1 markus 440: /* NOTREACHED */
441: }
442: if (pid < 0)
443: packet_disconnect("fork failed: %.100s", strerror(errno));
444: s->pid = pid;
1.47 markus 445: /* Set interactive/non-interactive mode. */
1.48 markus 446: packet_set_interactive(s->display != NULL);
1.1 markus 447: #ifdef USE_PIPES
448: /* We are the parent. Close the child sides of the pipes. */
449: close(pin[0]);
450: close(pout[1]);
451: close(perr[1]);
452:
1.2 markus 453: if (compat20) {
1.176 djm 454: if (s->is_subsystem) {
455: close(perr[0]);
456: perr[0] = -1;
457: }
458: session_set_fds(s, pin[1], pout[0], perr[0]);
1.2 markus 459: } else {
460: /* Enter the interactive session. */
461: server_loop(pid, pin[1], pout[0], perr[0]);
1.64 markus 462: /* server_loop has closed pin[1], pout[0], and perr[0]. */
1.2 markus 463: }
1.1 markus 464: #else /* USE_PIPES */
465: /* We are the parent. Close the child sides of the socket pairs. */
466: close(inout[0]);
467: close(err[0]);
468:
469: /*
470: * Enter the interactive session. Note: server_loop must be able to
471: * handle the case that fdin and fdout are the same.
472: */
1.2 markus 473: if (compat20) {
1.64 markus 474: session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
1.2 markus 475: } else {
476: server_loop(pid, inout[1], inout[1], err[1]);
477: /* server_loop has closed inout[1] and err[1]. */
478: }
1.1 markus 479: #endif /* USE_PIPES */
480: }
481:
482: /*
483: * This is called to fork and execute a command when we have a tty. This
484: * will call do_child from the child, and server_loop from the parent after
485: * setting up file descriptors, controlling tty, updating wtmp, utmp,
486: * lastlog, and other such operations.
487: */
1.4 markus 488: void
1.63 markus 489: do_exec_pty(Session *s, const char *command)
1.1 markus 490: {
491: int fdout, ptyfd, ttyfd, ptymaster;
492: pid_t pid;
493:
494: if (s == NULL)
495: fatal("do_exec_pty: no session");
496: ptyfd = s->ptyfd;
497: ttyfd = s->ttyfd;
498:
499: /* Fork the child. */
500: if ((pid = fork()) == 0) {
1.165 markus 501: is_child = 1;
1.97 markus 502:
1.24 markus 503: /* Child. Reinitialize the log because the pid has changed. */
1.1 markus 504: log_init(__progname, options.log_level, options.log_facility, log_stderr);
505: /* Close the master side of the pseudo tty. */
506: close(ptyfd);
507:
508: /* Make the pseudo tty our controlling tty. */
509: pty_make_controlling_tty(&ttyfd, s->tty);
510:
1.103 markus 511: /* Redirect stdin/stdout/stderr from the pseudo tty. */
512: if (dup2(ttyfd, 0) < 0)
513: error("dup2 stdin: %s", strerror(errno));
514: if (dup2(ttyfd, 1) < 0)
515: error("dup2 stdout: %s", strerror(errno));
516: if (dup2(ttyfd, 2) < 0)
517: error("dup2 stderr: %s", strerror(errno));
1.1 markus 518:
519: /* Close the extra descriptor for the pseudo tty. */
520: close(ttyfd);
521:
1.24 markus 522: /* record login, etc. similar to login(1) */
1.41 markus 523: if (!(options.use_login && command == NULL))
524: do_login(s, command);
1.1 markus 525:
526: /* Do common processing for the child, such as execing the command. */
1.60 markus 527: do_child(s, command);
1.1 markus 528: /* NOTREACHED */
529: }
530: if (pid < 0)
531: packet_disconnect("fork failed: %.100s", strerror(errno));
532: s->pid = pid;
533:
534: /* Parent. Close the slave side of the pseudo tty. */
535: close(ttyfd);
536:
537: /*
538: * Create another descriptor of the pty master side for use as the
539: * standard input. We could use the original descriptor, but this
540: * simplifies code in server_loop. The descriptor is bidirectional.
541: */
542: fdout = dup(ptyfd);
543: if (fdout < 0)
544: packet_disconnect("dup #1 failed: %.100s", strerror(errno));
545:
546: /* we keep a reference to the pty master */
547: ptymaster = dup(ptyfd);
548: if (ptymaster < 0)
549: packet_disconnect("dup #2 failed: %.100s", strerror(errno));
550: s->ptymaster = ptymaster;
551:
552: /* Enter interactive session. */
1.47 markus 553: packet_set_interactive(1);
1.2 markus 554: if (compat20) {
555: session_set_fds(s, ptyfd, fdout, -1);
556: } else {
557: server_loop(pid, ptyfd, fdout, -1);
558: /* server_loop _has_ closed ptyfd and fdout. */
1.24 markus 559: }
560: }
561:
1.90 markus 562: /*
563: * This is called to fork and execute a command. If another command is
564: * to be forced, execute that instead.
565: */
566: void
567: do_exec(Session *s, const char *command)
568: {
569: if (forced_command) {
570: original_command = command;
571: command = forced_command;
572: debug("Forced command '%.900s'", command);
573: }
1.163 markus 574:
575: #ifdef GSSAPI
576: if (options.gss_authentication) {
577: temporarily_use_uid(s->pw);
578: ssh_gssapi_storecreds();
579: restore_uid();
580: }
581: #endif
1.90 markus 582:
583: if (s->ttyfd != -1)
584: do_exec_pty(s, command);
585: else
586: do_exec_no_pty(s, command);
587:
1.92 markus 588: original_command = NULL;
1.90 markus 589: }
590:
591:
1.24 markus 592: /* administrative, login(1)-like work */
593: void
1.41 markus 594: do_login(Session *s, const char *command)
1.24 markus 595: {
596: char *time_string;
597: socklen_t fromlen;
598: struct sockaddr_storage from;
599: struct passwd * pw = s->pw;
600: pid_t pid = getpid();
601:
602: /*
603: * Get IP address of client. If the connection is not a socket, let
604: * the address be 0.0.0.0.
605: */
606: memset(&from, 0, sizeof(from));
1.148 stevesk 607: fromlen = sizeof(from);
1.24 markus 608: if (packet_connection_is_on_socket()) {
609: if (getpeername(packet_get_connection_in(),
1.112 deraadt 610: (struct sockaddr *) & from, &fromlen) < 0) {
1.24 markus 611: debug("getpeername: %.100s", strerror(errno));
1.165 markus 612: cleanup_exit(255);
1.24 markus 613: }
614: }
1.25 markus 615:
1.24 markus 616: /* Record that there was a login on that tty from the remote host. */
1.133 markus 617: if (!use_privsep)
618: record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
619: get_remote_name_or_ip(utmp_len,
1.158 markus 620: options.use_dns),
1.148 stevesk 621: (struct sockaddr *)&from, fromlen);
1.24 markus 622:
1.73 djm 623: if (check_quietlogin(s, command))
1.24 markus 624: return;
1.73 djm 625:
1.134 markus 626: if (options.print_lastlog && s->last_login_time != 0) {
627: time_string = ctime(&s->last_login_time);
1.24 markus 628: if (strchr(time_string, '\n'))
629: *strchr(time_string, '\n') = 0;
1.134 markus 630: if (strcmp(s->hostname, "") == 0)
1.24 markus 631: printf("Last login: %s\r\n", time_string);
632: else
1.134 markus 633: printf("Last login: %s from %s\r\n", time_string,
634: s->hostname);
1.24 markus 635: }
1.73 djm 636:
637: do_motd();
638: }
639:
640: /*
641: * Display the message of the day.
642: */
643: void
644: do_motd(void)
645: {
646: FILE *f;
647: char buf[256];
648:
1.24 markus 649: if (options.print_motd) {
1.28 millert 650: #ifdef HAVE_LOGIN_CAP
651: f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
652: "/etc/motd"), "r");
653: #else
1.24 markus 654: f = fopen("/etc/motd", "r");
1.28 millert 655: #endif
1.24 markus 656: if (f) {
657: while (fgets(buf, sizeof(buf), f))
658: fputs(buf, stdout);
659: fclose(f);
660: }
1.2 markus 661: }
1.73 djm 662: }
663:
664:
665: /*
666: * Check for quiet login, either .hushlogin or command given.
667: */
668: int
669: check_quietlogin(Session *s, const char *command)
670: {
671: char buf[256];
1.96 dugsong 672: struct passwd *pw = s->pw;
1.73 djm 673: struct stat st;
674:
675: /* Return 1 if .hushlogin exists or a command given. */
676: if (command != NULL)
677: return 1;
678: snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
679: #ifdef HAVE_LOGIN_CAP
680: if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
681: return 1;
682: #else
683: if (stat(buf, &st) >= 0)
684: return 1;
685: #endif
686: return 0;
1.1 markus 687: }
688:
689: /*
690: * Sets the value of the given variable in the environment. If the variable
691: * already exists, its value is overriden.
692: */
1.161 markus 693: void
1.45 markus 694: child_set_env(char ***envp, u_int *envsizep, const char *name,
1.112 deraadt 695: const char *value)
1.1 markus 696: {
1.164 markus 697: char **env;
698: u_int envsize;
1.45 markus 699: u_int i, namelen;
1.1 markus 700:
701: /*
702: * Find the slot where the value should be stored. If the variable
703: * already exists, we reuse the slot; otherwise we append a new slot
704: * at the end of the array, expanding if necessary.
705: */
706: env = *envp;
707: namelen = strlen(name);
708: for (i = 0; env[i]; i++)
709: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
710: break;
711: if (env[i]) {
712: /* Reuse the slot. */
713: xfree(env[i]);
714: } else {
715: /* New variable. Expand if necessary. */
1.164 markus 716: envsize = *envsizep;
717: if (i >= envsize - 1) {
718: if (envsize >= 1000)
719: fatal("child_set_env: too many env vars");
720: envsize += 50;
721: env = (*envp) = xrealloc(env, envsize * sizeof(char *));
722: *envsizep = envsize;
1.1 markus 723: }
724: /* Need to set the NULL pointer at end of array beyond the new slot. */
725: env[i + 1] = NULL;
726: }
727:
728: /* Allocate space and format the variable in the appropriate slot. */
729: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
730: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
731: }
732:
733: /*
734: * Reads environment variables from the given file and adds/overrides them
735: * into the environment. If the file does not exist, this does nothing.
736: * Otherwise, it must consist of empty lines, comments (line starts with '#')
737: * and assignments of the form name=value. No other forms are allowed.
738: */
1.94 itojun 739: static void
1.45 markus 740: read_environment_file(char ***env, u_int *envsize,
1.112 deraadt 741: const char *filename)
1.1 markus 742: {
743: FILE *f;
744: char buf[4096];
745: char *cp, *value;
1.142 deraadt 746: u_int lineno = 0;
1.1 markus 747:
748: f = fopen(filename, "r");
749: if (!f)
750: return;
751:
752: while (fgets(buf, sizeof(buf), f)) {
1.142 deraadt 753: if (++lineno > 1000)
754: fatal("Too many lines in environment file %s", filename);
1.1 markus 755: for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
756: ;
757: if (!*cp || *cp == '#' || *cp == '\n')
758: continue;
759: if (strchr(cp, '\n'))
760: *strchr(cp, '\n') = '\0';
761: value = strchr(cp, '=');
762: if (value == NULL) {
1.142 deraadt 763: fprintf(stderr, "Bad line %u in %.100s\n", lineno,
764: filename);
1.1 markus 765: continue;
766: }
1.14 deraadt 767: /*
768: * Replace the equals sign by nul, and advance value to
769: * the value string.
770: */
1.1 markus 771: *value = '\0';
772: value++;
773: child_set_env(env, envsize, cp, value);
774: }
775: fclose(f);
776: }
777:
1.127 markus 778: static char **
779: do_setup_env(Session *s, const char *shell)
1.1 markus 780: {
781: char buf[256];
1.127 markus 782: u_int i, envsize;
1.154 markus 783: char **env, *laddr;
1.127 markus 784: struct passwd *pw = s->pw;
1.1 markus 785:
786: /* Initialize the environment. */
787: envsize = 100;
788: env = xmalloc(envsize * sizeof(char *));
789: env[0] = NULL;
790:
1.161 markus 791: #ifdef GSSAPI
1.168 djm 792: /* Allow any GSSAPI methods that we've used to alter
1.161 markus 793: * the childs environment as they see fit
794: */
795: ssh_gssapi_do_child(&env, &envsize);
796: #endif
797:
1.1 markus 798: if (!options.use_login) {
799: /* Set basic environment. */
1.173 djm 800: for (i = 0; i < s->num_env; i++)
801: child_set_env(&env, &envsize, s->env[i].name,
802: s->env[i].val);
803:
1.1 markus 804: child_set_env(&env, &envsize, "USER", pw->pw_name);
805: child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
806: child_set_env(&env, &envsize, "HOME", pw->pw_dir);
1.28 millert 807: #ifdef HAVE_LOGIN_CAP
1.145 markus 808: if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
809: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
810: else
811: child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1.28 millert 812: #else
1.29 millert 813: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1.28 millert 814: #endif
1.1 markus 815:
816: snprintf(buf, sizeof buf, "%.200s/%.50s",
817: _PATH_MAILDIR, pw->pw_name);
818: child_set_env(&env, &envsize, "MAIL", buf);
819:
820: /* Normal systems set SHELL by default. */
821: child_set_env(&env, &envsize, "SHELL", shell);
822: }
823: if (getenv("TZ"))
824: child_set_env(&env, &envsize, "TZ", getenv("TZ"));
825:
826: /* Set custom environment options from RSA authentication. */
1.110 markus 827: if (!options.use_login) {
828: while (custom_environment) {
829: struct envstring *ce = custom_environment;
1.143 deraadt 830: char *str = ce->s;
1.127 markus 831:
1.143 deraadt 832: for (i = 0; str[i] != '=' && str[i]; i++)
1.110 markus 833: ;
1.143 deraadt 834: if (str[i] == '=') {
835: str[i] = 0;
836: child_set_env(&env, &envsize, str, str + i + 1);
1.110 markus 837: }
838: custom_environment = ce->next;
839: xfree(ce->s);
840: xfree(ce);
1.1 markus 841: }
842: }
843:
1.149 stevesk 844: /* SSH_CLIENT deprecated */
1.1 markus 845: snprintf(buf, sizeof buf, "%.50s %d %d",
1.127 markus 846: get_remote_ipaddr(), get_remote_port(), get_local_port());
1.1 markus 847: child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1.149 stevesk 848:
1.154 markus 849: laddr = get_local_ipaddr(packet_get_connection_in());
1.149 stevesk 850: snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1.154 markus 851: get_remote_ipaddr(), get_remote_port(), laddr, get_local_port());
852: xfree(laddr);
1.149 stevesk 853: child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1.1 markus 854:
1.60 markus 855: if (s->ttyfd != -1)
856: child_set_env(&env, &envsize, "SSH_TTY", s->tty);
857: if (s->term)
858: child_set_env(&env, &envsize, "TERM", s->term);
859: if (s->display)
860: child_set_env(&env, &envsize, "DISPLAY", s->display);
1.34 markus 861: if (original_command)
862: child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
863: original_command);
1.96 dugsong 864: #ifdef KRB5
865: if (s->authctxt->krb5_ticket_file)
866: child_set_env(&env, &envsize, "KRB5CCNAME",
1.112 deraadt 867: s->authctxt->krb5_ticket_file);
1.96 dugsong 868: #endif
1.136 markus 869: if (auth_sock_name != NULL)
1.1 markus 870: child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1.136 markus 871: auth_sock_name);
1.1 markus 872:
873: /* read $HOME/.ssh/environment. */
1.146 markus 874: if (options.permit_user_env && !options.use_login) {
1.14 deraadt 875: snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
876: pw->pw_dir);
1.1 markus 877: read_environment_file(&env, &envsize, buf);
878: }
879: if (debug_flag) {
880: /* dump the environment */
881: fprintf(stderr, "Environment:\n");
882: for (i = 0; env[i]; i++)
883: fprintf(stderr, " %.200s\n", env[i]);
884: }
1.127 markus 885: return env;
886: }
887:
888: /*
889: * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
890: * first in this order).
891: */
892: static void
893: do_rc_files(Session *s, const char *shell)
894: {
895: FILE *f = NULL;
896: char cmd[1024];
897: int do_xauth;
898: struct stat st;
899:
900: do_xauth =
901: s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
902:
903: /* ignore _PATH_SSH_USER_RC for subsystems */
904: if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
905: snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
906: shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
907: if (debug_flag)
908: fprintf(stderr, "Running %s\n", cmd);
909: f = popen(cmd, "w");
910: if (f) {
911: if (do_xauth)
912: fprintf(f, "%s %s\n", s->auth_proto,
913: s->auth_data);
914: pclose(f);
915: } else
916: fprintf(stderr, "Could not run %s\n",
917: _PATH_SSH_USER_RC);
918: } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
919: if (debug_flag)
920: fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
921: _PATH_SSH_SYSTEM_RC);
922: f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
923: if (f) {
924: if (do_xauth)
925: fprintf(f, "%s %s\n", s->auth_proto,
926: s->auth_data);
927: pclose(f);
928: } else
929: fprintf(stderr, "Could not run %s\n",
930: _PATH_SSH_SYSTEM_RC);
931: } else if (do_xauth && options.xauth_location != NULL) {
932: /* Add authority data to .Xauthority if appropriate. */
933: if (debug_flag) {
934: fprintf(stderr,
1.151 stevesk 935: "Running %.500s remove %.100s\n",
1.165 markus 936: options.xauth_location, s->auth_display);
1.151 stevesk 937: fprintf(stderr,
938: "%.500s add %.100s %.100s %.100s\n",
1.127 markus 939: options.xauth_location, s->auth_display,
940: s->auth_proto, s->auth_data);
941: }
942: snprintf(cmd, sizeof cmd, "%s -q -",
943: options.xauth_location);
944: f = popen(cmd, "w");
945: if (f) {
1.151 stevesk 946: fprintf(f, "remove %s\n",
947: s->auth_display);
1.127 markus 948: fprintf(f, "add %s %s %s\n",
949: s->auth_display, s->auth_proto,
950: s->auth_data);
951: pclose(f);
952: } else {
953: fprintf(stderr, "Could not run %s\n",
954: cmd);
955: }
956: }
957: }
958:
959: static void
960: do_nologin(struct passwd *pw)
961: {
962: FILE *f = NULL;
963: char buf[1024];
964:
965: #ifdef HAVE_LOGIN_CAP
966: if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
967: f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
968: _PATH_NOLOGIN), "r");
969: #else
970: if (pw->pw_uid)
971: f = fopen(_PATH_NOLOGIN, "r");
972: #endif
973: if (f) {
974: /* /etc/nologin exists. Print its contents and exit. */
1.155 itojun 975: logit("User %.100s not allowed because %s exists",
1.150 stevesk 976: pw->pw_name, _PATH_NOLOGIN);
1.127 markus 977: while (fgets(buf, sizeof(buf), f))
978: fputs(buf, stderr);
979: fclose(f);
980: exit(254);
981: }
982: }
983:
984: /* Set login name, uid, gid, and groups. */
1.130 provos 985: void
1.127 markus 986: do_setusercontext(struct passwd *pw)
987: {
988: if (getuid() == 0 || geteuid() == 0) {
989: #ifdef HAVE_LOGIN_CAP
990: if (setusercontext(lc, pw, pw->pw_uid,
991: (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
992: perror("unable to set user context");
993: exit(1);
994: }
995: #else
996: if (setlogin(pw->pw_name) < 0)
997: error("setlogin failed: %s", strerror(errno));
998: if (setgid(pw->pw_gid) < 0) {
999: perror("setgid");
1000: exit(1);
1001: }
1002: /* Initialize the group list. */
1003: if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
1004: perror("initgroups");
1005: exit(1);
1006: }
1007: endgrent();
1008:
1009: /* Permanently switch to the desired uid. */
1010: permanently_set_uid(pw);
1011: #endif
1012: }
1013: if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1014: fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1015: }
1016:
1.131 markus 1017: static void
1.172 markus 1018: do_pwchange(Session *s)
1019: {
1020: fprintf(stderr, "WARNING: Your password has expired.\n");
1021: if (s->ttyfd != -1) {
1022: fprintf(stderr,
1023: "You must change your password now and login again!\n");
1024: execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
1025: perror("passwd");
1026: } else {
1027: fprintf(stderr,
1028: "Password change required but no TTY available.\n");
1029: }
1030: exit(1);
1031: }
1032:
1033: static void
1.130 provos 1034: launch_login(struct passwd *pw, const char *hostname)
1035: {
1036: /* Launch login(1). */
1037:
1038: execl("/usr/bin/login", "login", "-h", hostname,
1039: "-p", "-f", "--", pw->pw_name, (char *)NULL);
1040:
1041: /* Login couldn't be executed, die. */
1042:
1043: perror("login");
1044: exit(1);
1045: }
1046:
1.172 markus 1047: static void
1048: child_close_fds(void)
1049: {
1050: int i;
1051:
1052: if (packet_get_connection_in() == packet_get_connection_out())
1053: close(packet_get_connection_in());
1054: else {
1055: close(packet_get_connection_in());
1056: close(packet_get_connection_out());
1057: }
1058: /*
1059: * Close all descriptors related to channels. They will still remain
1060: * open in the parent.
1061: */
1062: /* XXX better use close-on-exec? -markus */
1063: channel_close_all();
1064:
1065: /*
1066: * Close any extra file descriptors. Note that there may still be
1067: * descriptors left by system functions. They will be closed later.
1068: */
1069: endpwent();
1070:
1071: /*
1072: * Close any extra open file descriptors so that we don\'t have them
1073: * hanging around in clients. Note that we want to do this after
1074: * initgroups, because at least on Solaris 2.3 it leaves file
1075: * descriptors open.
1076: */
1077: for (i = 3; i < 64; i++)
1078: close(i);
1079: }
1080:
1.127 markus 1081: /*
1082: * Performs common processing for the child, such as setting up the
1083: * environment, closing extra file descriptors, setting the user and group
1084: * ids, and executing the command or shell.
1085: */
1086: void
1087: do_child(Session *s, const char *command)
1088: {
1089: extern char **environ;
1090: char **env;
1091: char *argv[10];
1092: const char *shell, *shell0, *hostname = NULL;
1093: struct passwd *pw = s->pw;
1094:
1095: /* remove hostkey from the child's memory */
1096: destroy_sensitive_data();
1097:
1.172 markus 1098: /* Force a password change */
1099: if (s->authctxt->force_pwchange) {
1100: do_setusercontext(pw);
1101: child_close_fds();
1102: do_pwchange(s);
1103: exit(1);
1104: }
1105:
1.127 markus 1106: /* login(1) is only called if we execute the login shell */
1107: if (options.use_login && command != NULL)
1108: options.use_login = 0;
1109:
1110: /*
1111: * Login(1) does this as well, and it needs uid 0 for the "-h"
1112: * switch, so we let login(1) to this for us.
1113: */
1114: if (!options.use_login) {
1115: do_nologin(pw);
1116: do_setusercontext(pw);
1117: }
1118:
1119: /*
1120: * Get the shell from the password data. An empty shell field is
1121: * legal, and means /bin/sh.
1122: */
1123: shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1.152 markus 1124:
1125: /*
1126: * Make sure $SHELL points to the shell from the password file,
1127: * even if shell is overridden from login.conf
1128: */
1129: env = do_setup_env(s, shell);
1130:
1.127 markus 1131: #ifdef HAVE_LOGIN_CAP
1132: shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1133: #endif
1134:
1.26 millert 1135: /* we have to stash the hostname before we close our socket. */
1136: if (options.use_login)
1.70 stevesk 1137: hostname = get_remote_name_or_ip(utmp_len,
1.158 markus 1138: options.use_dns);
1.1 markus 1139: /*
1140: * Close the connection descriptors; note that this is the child, and
1141: * the server will still have the socket open, and it is important
1142: * that we do not shutdown it. Note that the descriptors cannot be
1143: * closed before building the environment, as we call
1144: * get_remote_ipaddr there.
1145: */
1.172 markus 1146: child_close_fds();
1.1 markus 1147:
1148: /*
1.125 deraadt 1149: * Must take new environment into use so that .ssh/rc,
1150: * /etc/ssh/sshrc and xauth are run in the proper environment.
1.1 markus 1151: */
1152: environ = env;
1.170 jakob 1153:
1154: #ifdef KRB5
1155: /*
1156: * At this point, we check to see if AFS is active and if we have
1157: * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1158: * if we can (and need to) extend the ticket into an AFS token. If
1159: * we don't do this, we run into potential problems if the user's
1160: * home directory is in AFS and it's not world-readable.
1161: */
1162:
1163: if (options.kerberos_get_afs_token && k_hasafs() &&
1164: (s->authctxt->krb5_ctx != NULL)) {
1165: char cell[64];
1166:
1167: debug("Getting AFS token");
1168:
1169: k_setpag();
1170:
1171: if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1172: krb5_afslog(s->authctxt->krb5_ctx,
1173: s->authctxt->krb5_fwd_ccache, cell, NULL);
1174:
1175: krb5_afslog_home(s->authctxt->krb5_ctx,
1176: s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1177: }
1178: #endif
1.104 markus 1179:
1180: /* Change current directory to the user\'s home directory. */
1181: if (chdir(pw->pw_dir) < 0) {
1182: fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1183: pw->pw_dir, strerror(errno));
1184: #ifdef HAVE_LOGIN_CAP
1185: if (login_getcapbool(lc, "requirehome", 0))
1186: exit(1);
1187: #endif
1188: }
1.1 markus 1189:
1.127 markus 1190: if (!options.use_login)
1191: do_rc_files(s, shell);
1.67 markus 1192:
1193: /* restore SIGPIPE for child */
1194: signal(SIGPIPE, SIG_DFL);
1195:
1.127 markus 1196: if (options.use_login) {
1.130 provos 1197: launch_login(pw, hostname);
1198: /* NEVERREACHED */
1.127 markus 1199: }
1200:
1201: /* Get the last component of the shell name. */
1202: if ((shell0 = strrchr(shell, '/')) != NULL)
1203: shell0++;
1204: else
1205: shell0 = shell;
1206:
1.1 markus 1207: /*
1208: * If we have no command, execute the shell. In this case, the shell
1209: * name to be passed in argv[0] is preceded by '-' to indicate that
1210: * this is a login shell.
1211: */
1212: if (!command) {
1.127 markus 1213: char argv0[256];
1.1 markus 1214:
1.127 markus 1215: /* Start the shell. Set initial character to '-'. */
1216: argv0[0] = '-';
1.1 markus 1217:
1.127 markus 1218: if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1.128 markus 1219: >= sizeof(argv0) - 1) {
1.127 markus 1220: errno = EINVAL;
1.1 markus 1221: perror(shell);
1222: exit(1);
1.127 markus 1223: }
1.1 markus 1224:
1.127 markus 1225: /* Execute the shell. */
1226: argv[0] = argv0;
1227: argv[1] = NULL;
1228: execve(shell, argv, env);
1229:
1230: /* Executing the shell failed. */
1231: perror(shell);
1232: exit(1);
1.1 markus 1233: }
1234: /*
1235: * Execute the command using the user's shell. This uses the -c
1236: * option to execute the command.
1237: */
1.127 markus 1238: argv[0] = (char *) shell0;
1.1 markus 1239: argv[1] = "-c";
1240: argv[2] = (char *) command;
1241: argv[3] = NULL;
1242: execve(shell, argv, env);
1243: perror(shell);
1244: exit(1);
1245: }
1246:
1247: Session *
1248: session_new(void)
1249: {
1250: int i;
1251: static int did_init = 0;
1252: if (!did_init) {
1253: debug("session_new: init");
1.112 deraadt 1254: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1255: sessions[i].used = 0;
1256: }
1257: did_init = 1;
1258: }
1.112 deraadt 1259: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1260: Session *s = &sessions[i];
1261: if (! s->used) {
1.68 djm 1262: memset(s, 0, sizeof(*s));
1.1 markus 1263: s->chanid = -1;
1264: s->ptyfd = -1;
1265: s->ttyfd = -1;
1266: s->used = 1;
1.85 markus 1267: s->self = i;
1.1 markus 1268: debug("session_new: session %d", i);
1269: return s;
1270: }
1271: }
1272: return NULL;
1273: }
1274:
1.94 itojun 1275: static void
1.1 markus 1276: session_dump(void)
1277: {
1278: int i;
1.112 deraadt 1279: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1280: Session *s = &sessions[i];
1.137 mpech 1281: debug("dump: used %d session %d %p channel %d pid %ld",
1.1 markus 1282: s->used,
1283: s->self,
1284: s,
1285: s->chanid,
1.137 mpech 1286: (long)s->pid);
1.1 markus 1287: }
1288: }
1289:
1.2 markus 1290: int
1.97 markus 1291: session_open(Authctxt *authctxt, int chanid)
1.2 markus 1292: {
1293: Session *s = session_new();
1294: debug("session_open: channel %d", chanid);
1295: if (s == NULL) {
1296: error("no more sessions");
1297: return 0;
1298: }
1.97 markus 1299: s->authctxt = authctxt;
1300: s->pw = authctxt->pw;
1.167 djm 1301: if (s->pw == NULL || !authctxt->valid)
1.54 stevesk 1302: fatal("no user for session %d", s->self);
1.2 markus 1303: debug("session_open: session %d: link with channel %d", s->self, chanid);
1304: s->chanid = chanid;
1305: return 1;
1306: }
1307:
1.130 provos 1308: Session *
1309: session_by_tty(char *tty)
1310: {
1311: int i;
1312: for (i = 0; i < MAX_SESSIONS; i++) {
1313: Session *s = &sessions[i];
1314: if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1315: debug("session_by_tty: session %d tty %s", i, tty);
1316: return s;
1317: }
1318: }
1319: debug("session_by_tty: unknown tty %.100s", tty);
1320: session_dump();
1321: return NULL;
1322: }
1323:
1.94 itojun 1324: static Session *
1.2 markus 1325: session_by_channel(int id)
1326: {
1327: int i;
1.112 deraadt 1328: for (i = 0; i < MAX_SESSIONS; i++) {
1.2 markus 1329: Session *s = &sessions[i];
1330: if (s->used && s->chanid == id) {
1331: debug("session_by_channel: session %d channel %d", i, id);
1332: return s;
1333: }
1334: }
1335: debug("session_by_channel: unknown channel %d", id);
1336: session_dump();
1337: return NULL;
1338: }
1339:
1.94 itojun 1340: static Session *
1.2 markus 1341: session_by_pid(pid_t pid)
1342: {
1343: int i;
1.137 mpech 1344: debug("session_by_pid: pid %ld", (long)pid);
1.112 deraadt 1345: for (i = 0; i < MAX_SESSIONS; i++) {
1.2 markus 1346: Session *s = &sessions[i];
1347: if (s->used && s->pid == pid)
1348: return s;
1349: }
1.137 mpech 1350: error("session_by_pid: unknown pid %ld", (long)pid);
1.2 markus 1351: session_dump();
1352: return NULL;
1353: }
1354:
1.94 itojun 1355: static int
1.2 markus 1356: session_window_change_req(Session *s)
1357: {
1358: s->col = packet_get_int();
1359: s->row = packet_get_int();
1360: s->xpixel = packet_get_int();
1361: s->ypixel = packet_get_int();
1.116 markus 1362: packet_check_eom();
1.2 markus 1363: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1364: return 1;
1365: }
1366:
1.94 itojun 1367: static int
1.2 markus 1368: session_pty_req(Session *s)
1369: {
1.45 markus 1370: u_int len;
1.72 stevesk 1371: int n_bytes;
1.132 markus 1372:
1.86 markus 1373: if (no_pty_flag) {
1374: debug("Allocating a pty not permitted for this authentication.");
1.19 markus 1375: return 0;
1.86 markus 1376: }
1377: if (s->ttyfd != -1) {
1378: packet_disconnect("Protocol error: you already have a pty.");
1.3 markus 1379: return 0;
1.134 markus 1380: }
1381: /* Get the time and hostname when the user last logged in. */
1382: if (options.print_lastlog) {
1383: s->hostname[0] = '\0';
1384: s->last_login_time = get_last_login_time(s->pw->pw_uid,
1385: s->pw->pw_name, s->hostname, sizeof(s->hostname));
1.86 markus 1386: }
1387:
1.2 markus 1388: s->term = packet_get_string(&len);
1.86 markus 1389:
1390: if (compat20) {
1391: s->col = packet_get_int();
1392: s->row = packet_get_int();
1393: } else {
1394: s->row = packet_get_int();
1395: s->col = packet_get_int();
1396: }
1.2 markus 1397: s->xpixel = packet_get_int();
1398: s->ypixel = packet_get_int();
1399:
1400: if (strcmp(s->term, "") == 0) {
1401: xfree(s->term);
1402: s->term = NULL;
1403: }
1.86 markus 1404:
1.2 markus 1405: /* Allocate a pty and open it. */
1.86 markus 1406: debug("Allocating pty.");
1.130 provos 1407: if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
1.86 markus 1408: if (s->term)
1409: xfree(s->term);
1.2 markus 1410: s->term = NULL;
1411: s->ptyfd = -1;
1412: s->ttyfd = -1;
1413: error("session_pty_req: session %d alloc failed", s->self);
1.3 markus 1414: return 0;
1.2 markus 1415: }
1416: debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1.86 markus 1417:
1418: /* for SSH1 the tty modes length is not given */
1419: if (!compat20)
1420: n_bytes = packet_remaining();
1421: tty_parse_modes(s->ttyfd, &n_bytes);
1422:
1.130 provos 1423: if (!use_privsep)
1424: pty_setowner(s->pw, s->tty);
1.86 markus 1425:
1426: /* Set window size from the packet. */
1.2 markus 1427: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1428:
1.116 markus 1429: packet_check_eom();
1.9 markus 1430: session_proctitle(s);
1.2 markus 1431: return 1;
1432: }
1433:
1.94 itojun 1434: static int
1.7 markus 1435: session_subsystem_req(Session *s)
1436: {
1.105 markus 1437: struct stat st;
1.45 markus 1438: u_int len;
1.7 markus 1439: int success = 0;
1.105 markus 1440: char *cmd, *subsys = packet_get_string(&len);
1.18 jakob 1441: int i;
1.7 markus 1442:
1.116 markus 1443: packet_check_eom();
1.155 itojun 1444: logit("subsystem request for %.100s", subsys);
1.18 jakob 1445:
1446: for (i = 0; i < options.num_subsystems; i++) {
1.105 markus 1447: if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1448: cmd = options.subsystem_command[i];
1449: if (stat(cmd, &st) < 0) {
1450: error("subsystem: cannot stat %s: %s", cmd,
1451: strerror(errno));
1452: break;
1453: }
1454: debug("subsystem: exec() %s", cmd);
1.64 markus 1455: s->is_subsystem = 1;
1.105 markus 1456: do_exec(s, cmd);
1.18 jakob 1457: success = 1;
1.122 markus 1458: break;
1.18 jakob 1459: }
1460: }
1461:
1462: if (!success)
1.155 itojun 1463: logit("subsystem request for %.100s failed, subsystem not found",
1.105 markus 1464: subsys);
1.7 markus 1465:
1466: xfree(subsys);
1467: return success;
1468: }
1469:
1.94 itojun 1470: static int
1.7 markus 1471: session_x11_req(Session *s)
1472: {
1.81 markus 1473: int success;
1.7 markus 1474:
1475: s->single_connection = packet_get_char();
1476: s->auth_proto = packet_get_string(NULL);
1477: s->auth_data = packet_get_string(NULL);
1478: s->screen = packet_get_int();
1.116 markus 1479: packet_check_eom();
1.7 markus 1480:
1.81 markus 1481: success = session_setup_x11fwd(s);
1482: if (!success) {
1.7 markus 1483: xfree(s->auth_proto);
1484: xfree(s->auth_data);
1.84 markus 1485: s->auth_proto = NULL;
1486: s->auth_data = NULL;
1.7 markus 1487: }
1.81 markus 1488: return success;
1.7 markus 1489: }
1490:
1.94 itojun 1491: static int
1.19 markus 1492: session_shell_req(Session *s)
1493: {
1.116 markus 1494: packet_check_eom();
1.90 markus 1495: do_exec(s, NULL);
1.19 markus 1496: return 1;
1497: }
1498:
1.94 itojun 1499: static int
1.19 markus 1500: session_exec_req(Session *s)
1501: {
1.45 markus 1502: u_int len;
1.19 markus 1503: char *command = packet_get_string(&len);
1.116 markus 1504: packet_check_eom();
1.90 markus 1505: do_exec(s, command);
1.92 markus 1506: xfree(command);
1.19 markus 1507: return 1;
1508: }
1509:
1.94 itojun 1510: static int
1.157 markus 1511: session_break_req(Session *s)
1512: {
1513:
1.175 deraadt 1514: packet_get_int(); /* ignored */
1.157 markus 1515: packet_check_eom();
1516:
1.160 markus 1517: if (s->ttyfd == -1 ||
1518: tcsendbreak(s->ttyfd, 0) < 0)
1.157 markus 1519: return 0;
1520: return 1;
1521: }
1522:
1523: static int
1.173 djm 1524: session_env_req(Session *s)
1525: {
1526: char *name, *val;
1527: u_int name_len, val_len, i;
1528:
1529: name = packet_get_string(&name_len);
1530: val = packet_get_string(&val_len);
1531: packet_check_eom();
1532:
1533: /* Don't set too many environment variables */
1534: if (s->num_env > 128) {
1535: debug2("Ignoring env request %s: too many env vars", name);
1536: goto fail;
1537: }
1538:
1539: for (i = 0; i < options.num_accept_env; i++) {
1540: if (match_pattern(name, options.accept_env[i])) {
1541: debug2("Setting env %d: %s=%s", s->num_env, name, val);
1542: s->env = xrealloc(s->env, sizeof(*s->env) *
1543: (s->num_env + 1));
1544: s->env[s->num_env].name = name;
1545: s->env[s->num_env].val = val;
1546: s->num_env++;
1547: return (1);
1548: }
1549: }
1550: debug2("Ignoring env request %s: disallowed name", name);
1551:
1552: fail:
1553: xfree(name);
1554: xfree(val);
1555: return (0);
1556: }
1557:
1558: static int
1.43 markus 1559: session_auth_agent_req(Session *s)
1560: {
1561: static int called = 0;
1.116 markus 1562: packet_check_eom();
1.44 markus 1563: if (no_agent_forwarding_flag) {
1564: debug("session_auth_agent_req: no_agent_forwarding_flag");
1565: return 0;
1566: }
1.43 markus 1567: if (called) {
1568: return 0;
1569: } else {
1570: called = 1;
1571: return auth_input_request_forwarding(s->pw);
1572: }
1573: }
1574:
1.123 markus 1575: int
1576: session_input_channel_req(Channel *c, const char *rtype)
1.2 markus 1577: {
1578: int success = 0;
1579: Session *s;
1580:
1.123 markus 1581: if ((s = session_by_channel(c->self)) == NULL) {
1.155 itojun 1582: logit("session_input_channel_req: no session %d req %.100s",
1.123 markus 1583: c->self, rtype);
1584: return 0;
1585: }
1586: debug("session_input_channel_req: session %d req %s", s->self, rtype);
1.2 markus 1587:
1588: /*
1.64 markus 1589: * a session is in LARVAL state until a shell, a command
1590: * or a subsystem is executed
1.2 markus 1591: */
1592: if (c->type == SSH_CHANNEL_LARVAL) {
1593: if (strcmp(rtype, "shell") == 0) {
1.19 markus 1594: success = session_shell_req(s);
1.2 markus 1595: } else if (strcmp(rtype, "exec") == 0) {
1.19 markus 1596: success = session_exec_req(s);
1.2 markus 1597: } else if (strcmp(rtype, "pty-req") == 0) {
1.3 markus 1598: success = session_pty_req(s);
1.7 markus 1599: } else if (strcmp(rtype, "x11-req") == 0) {
1600: success = session_x11_req(s);
1.43 markus 1601: } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1602: success = session_auth_agent_req(s);
1.7 markus 1603: } else if (strcmp(rtype, "subsystem") == 0) {
1604: success = session_subsystem_req(s);
1.173 djm 1605: } else if (strcmp(rtype, "env") == 0) {
1606: success = session_env_req(s);
1.2 markus 1607: }
1608: }
1609: if (strcmp(rtype, "window-change") == 0) {
1610: success = session_window_change_req(s);
1.177 ! djm 1611: } else if (strcmp(rtype, "break") == 0) {
! 1612: success = session_break_req(s);
1.2 markus 1613: }
1.177 ! djm 1614:
1.123 markus 1615: return success;
1.2 markus 1616: }
1617:
1618: void
1619: session_set_fds(Session *s, int fdin, int fdout, int fderr)
1620: {
1621: if (!compat20)
1622: fatal("session_set_fds: called for proto != 2.0");
1623: /*
1624: * now that have a child and a pipe to the child,
1625: * we can activate our channel and register the fd's
1626: */
1627: if (s->chanid == -1)
1628: fatal("no channel for session %d", s->self);
1629: channel_set_fds(s->chanid,
1630: fdout, fdin, fderr,
1.42 markus 1631: fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1.126 markus 1632: 1,
1633: CHAN_SES_WINDOW_DEFAULT);
1.2 markus 1634: }
1635:
1.85 markus 1636: /*
1637: * Function to perform pty cleanup. Also called if we get aborted abnormally
1638: * (e.g., due to a dropped connection).
1639: */
1.130 provos 1640: void
1.165 markus 1641: session_pty_cleanup2(Session *s)
1.1 markus 1642: {
1.85 markus 1643: if (s == NULL) {
1644: error("session_pty_cleanup: no session");
1645: return;
1646: }
1647: if (s->ttyfd == -1)
1.1 markus 1648: return;
1649:
1.54 stevesk 1650: debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1.1 markus 1651:
1652: /* Record that the user has logged out. */
1.85 markus 1653: if (s->pid != 0)
1654: record_logout(s->pid, s->tty);
1.1 markus 1655:
1656: /* Release the pseudo-tty. */
1.130 provos 1657: if (getuid() == 0)
1658: pty_release(s->tty);
1.1 markus 1659:
1660: /*
1661: * Close the server side of the socket pairs. We must do this after
1662: * the pty cleanup, so that another process doesn't get this pty
1663: * while we're still cleaning up.
1664: */
1665: if (close(s->ptymaster) < 0)
1.130 provos 1666: error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
1.108 markus 1667:
1668: /* unlink pty from session */
1669: s->ttyfd = -1;
1.2 markus 1670: }
1671:
1.130 provos 1672: void
1.165 markus 1673: session_pty_cleanup(Session *s)
1.130 provos 1674: {
1.165 markus 1675: PRIVSEP(session_pty_cleanup2(s));
1.130 provos 1676: }
1677:
1.147 markus 1678: static char *
1679: sig2name(int sig)
1680: {
1681: #define SSH_SIG(x) if (sig == SIG ## x) return #x
1682: SSH_SIG(ABRT);
1683: SSH_SIG(ALRM);
1684: SSH_SIG(FPE);
1685: SSH_SIG(HUP);
1686: SSH_SIG(ILL);
1687: SSH_SIG(INT);
1688: SSH_SIG(KILL);
1689: SSH_SIG(PIPE);
1690: SSH_SIG(QUIT);
1691: SSH_SIG(SEGV);
1692: SSH_SIG(TERM);
1693: SSH_SIG(USR1);
1694: SSH_SIG(USR2);
1695: #undef SSH_SIG
1696: return "SIG@openssh.com";
1697: }
1698:
1.94 itojun 1699: static void
1.2 markus 1700: session_exit_message(Session *s, int status)
1701: {
1702: Channel *c;
1.124 markus 1703:
1704: if ((c = channel_lookup(s->chanid)) == NULL)
1.85 markus 1705: fatal("session_exit_message: session %d: no channel %d",
1.2 markus 1706: s->self, s->chanid);
1.137 mpech 1707: debug("session_exit_message: session %d channel %d pid %ld",
1708: s->self, s->chanid, (long)s->pid);
1.2 markus 1709:
1710: if (WIFEXITED(status)) {
1.124 markus 1711: channel_request_start(s->chanid, "exit-status", 0);
1.2 markus 1712: packet_put_int(WEXITSTATUS(status));
1713: packet_send();
1714: } else if (WIFSIGNALED(status)) {
1.124 markus 1715: channel_request_start(s->chanid, "exit-signal", 0);
1.147 markus 1716: packet_put_cstring(sig2name(WTERMSIG(status)));
1.2 markus 1717: packet_put_char(WCOREDUMP(status));
1718: packet_put_cstring("");
1719: packet_put_cstring("");
1720: packet_send();
1721: } else {
1722: /* Some weird exit cause. Just exit. */
1723: packet_disconnect("wait returned status %04x.", status);
1724: }
1725:
1726: /* disconnect channel */
1727: debug("session_exit_message: release channel %d", s->chanid);
1728: channel_cancel_cleanup(s->chanid);
1.5 markus 1729: /*
1730: * emulate a write failure with 'chan_write_failed', nobody will be
1731: * interested in data we write.
1732: * Note that we must not call 'chan_read_failed', since there could
1733: * be some more data waiting in the pipe.
1734: */
1.8 markus 1735: if (c->ostate != CHAN_OUTPUT_CLOSED)
1736: chan_write_failed(c);
1.2 markus 1737: s->chanid = -1;
1738: }
1739:
1.130 provos 1740: void
1.85 markus 1741: session_close(Session *s)
1.2 markus 1742: {
1.173 djm 1743: int i;
1744:
1.137 mpech 1745: debug("session_close: session %d pid %ld", s->self, (long)s->pid);
1.165 markus 1746: if (s->ttyfd != -1)
1.85 markus 1747: session_pty_cleanup(s);
1.2 markus 1748: if (s->term)
1749: xfree(s->term);
1750: if (s->display)
1751: xfree(s->display);
1.118 stevesk 1752: if (s->auth_display)
1753: xfree(s->auth_display);
1.2 markus 1754: if (s->auth_data)
1755: xfree(s->auth_data);
1756: if (s->auth_proto)
1757: xfree(s->auth_proto);
1758: s->used = 0;
1.173 djm 1759: for (i = 0; i < s->num_env; i++) {
1760: xfree(s->env[i].name);
1761: xfree(s->env[i].val);
1762: }
1763: if (s->env != NULL)
1764: xfree(s->env);
1.9 markus 1765: session_proctitle(s);
1.2 markus 1766: }
1767:
1768: void
1769: session_close_by_pid(pid_t pid, int status)
1770: {
1771: Session *s = session_by_pid(pid);
1772: if (s == NULL) {
1.137 mpech 1773: debug("session_close_by_pid: no session for pid %ld",
1774: (long)pid);
1.2 markus 1775: return;
1776: }
1777: if (s->chanid != -1)
1778: session_exit_message(s, status);
1779: session_close(s);
1.98 markus 1780: }
1781:
1.2 markus 1782: /*
1783: * this is called when a channel dies before
1784: * the session 'child' itself dies
1785: */
1786: void
1787: session_close_by_channel(int id, void *arg)
1788: {
1789: Session *s = session_by_channel(id);
1790: if (s == NULL) {
1.107 markus 1791: debug("session_close_by_channel: no session for id %d", id);
1.2 markus 1792: return;
1793: }
1.137 mpech 1794: debug("session_close_by_channel: channel %d child %ld",
1795: id, (long)s->pid);
1.107 markus 1796: if (s->pid != 0) {
1797: debug("session_close_by_channel: channel %d: has child", id);
1.108 markus 1798: /*
1799: * delay detach of session, but release pty, since
1800: * the fd's to the child are already closed
1801: */
1.165 markus 1802: if (s->ttyfd != -1)
1.108 markus 1803: session_pty_cleanup(s);
1.107 markus 1804: return;
1805: }
1806: /* detach by removing callback */
1.2 markus 1807: channel_cancel_cleanup(s->chanid);
1808: s->chanid = -1;
1.106 markus 1809: session_close(s);
1810: }
1811:
1812: void
1.130 provos 1813: session_destroy_all(void (*closefunc)(Session *))
1.106 markus 1814: {
1815: int i;
1.112 deraadt 1816: for (i = 0; i < MAX_SESSIONS; i++) {
1.106 markus 1817: Session *s = &sessions[i];
1.130 provos 1818: if (s->used) {
1819: if (closefunc != NULL)
1820: closefunc(s);
1821: else
1822: session_close(s);
1823: }
1.2 markus 1824: }
1.9 markus 1825: }
1826:
1.94 itojun 1827: static char *
1.9 markus 1828: session_tty_list(void)
1829: {
1830: static char buf[1024];
1831: int i;
1832: buf[0] = '\0';
1.112 deraadt 1833: for (i = 0; i < MAX_SESSIONS; i++) {
1.9 markus 1834: Session *s = &sessions[i];
1835: if (s->used && s->ttyfd != -1) {
1836: if (buf[0] != '\0')
1837: strlcat(buf, ",", sizeof buf);
1838: strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1839: }
1840: }
1841: if (buf[0] == '\0')
1842: strlcpy(buf, "notty", sizeof buf);
1843: return buf;
1844: }
1845:
1846: void
1847: session_proctitle(Session *s)
1848: {
1849: if (s->pw == NULL)
1850: error("no user for session %d", s->self);
1851: else
1852: setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1.81 markus 1853: }
1854:
1855: int
1856: session_setup_x11fwd(Session *s)
1857: {
1858: struct stat st;
1.109 stevesk 1859: char display[512], auth_display[512];
1860: char hostname[MAXHOSTNAMELEN];
1.81 markus 1861:
1862: if (no_x11_forwarding_flag) {
1863: packet_send_debug("X11 forwarding disabled in user configuration file.");
1864: return 0;
1865: }
1866: if (!options.x11_forwarding) {
1867: debug("X11 forwarding disabled in server configuration file.");
1868: return 0;
1869: }
1870: if (!options.xauth_location ||
1871: (stat(options.xauth_location, &st) == -1)) {
1872: packet_send_debug("No xauth program; cannot forward with spoofing.");
1.91 markus 1873: return 0;
1874: }
1875: if (options.use_login) {
1876: packet_send_debug("X11 forwarding disabled; "
1877: "not compatible with UseLogin=yes.");
1.81 markus 1878: return 0;
1879: }
1.87 markus 1880: if (s->display != NULL) {
1.81 markus 1881: debug("X11 display already set.");
1882: return 0;
1883: }
1.140 deraadt 1884: if (x11_create_display_inet(options.x11_display_offset,
1885: options.x11_use_localhost, s->single_connection,
1886: &s->display_number) == -1) {
1.87 markus 1887: debug("x11_create_display_inet failed.");
1.81 markus 1888: return 0;
1889: }
1.109 stevesk 1890:
1891: /* Set up a suitable value for the DISPLAY variable. */
1892: if (gethostname(hostname, sizeof(hostname)) < 0)
1893: fatal("gethostname: %.100s", strerror(errno));
1894: /*
1895: * auth_display must be used as the displayname when the
1896: * authorization entry is added with xauth(1). This will be
1897: * different than the DISPLAY string for localhost displays.
1898: */
1.119 stevesk 1899: if (options.x11_use_localhost) {
1.140 deraadt 1900: snprintf(display, sizeof display, "localhost:%u.%u",
1.109 stevesk 1901: s->display_number, s->screen);
1.140 deraadt 1902: snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
1.118 stevesk 1903: s->display_number, s->screen);
1.109 stevesk 1904: s->display = xstrdup(display);
1.118 stevesk 1905: s->auth_display = xstrdup(auth_display);
1.109 stevesk 1906: } else {
1.140 deraadt 1907: snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
1.109 stevesk 1908: s->display_number, s->screen);
1909: s->display = xstrdup(display);
1.118 stevesk 1910: s->auth_display = xstrdup(display);
1.109 stevesk 1911: }
1912:
1.81 markus 1913: return 1;
1.2 markus 1914: }
1915:
1.94 itojun 1916: static void
1.49 markus 1917: do_authenticated2(Authctxt *authctxt)
1.2 markus 1918: {
1.97 markus 1919: server_loop2(authctxt);
1.165 markus 1920: }
1921:
1922: void
1923: do_cleanup(Authctxt *authctxt)
1924: {
1925: static int called = 0;
1926:
1927: debug("do_cleanup");
1928:
1929: /* no cleanup if we're in the child for login shell */
1930: if (is_child)
1931: return;
1932:
1933: /* avoid double cleanup */
1934: if (called)
1935: return;
1936: called = 1;
1937:
1938: if (authctxt == NULL)
1939: return;
1940: #ifdef KRB5
1941: if (options.kerberos_ticket_cleanup &&
1942: authctxt->krb5_ctx)
1943: krb5_cleanup_proc(authctxt);
1.161 markus 1944: #endif
1.165 markus 1945:
1946: #ifdef GSSAPI
1947: if (compat20 && options.gss_cleanup_creds)
1948: ssh_gssapi_cleanup_creds();
1949: #endif
1950:
1951: /* remove agent socket */
1952: auth_sock_cleanup_proc(authctxt->pw);
1953:
1954: /*
1955: * Cleanup ptys/utmp only if privsep is disabled,
1956: * or if running in monitor.
1957: */
1958: if (!use_privsep || mm_is_monitor())
1959: session_destroy_all(session_pty_cleanup2);
1.1 markus 1960: }
![[BACK]](/icons/back.gif){kind=icon}
Return to session.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh