Annotation of src/usr.bin/ssh/session.c, Revision 1.222
1.222 ! djm 1: /* $OpenBSD: session.c,v 1.221 2007/01/21 01:41:54 stevesk Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
1.37 deraadt 5: *
6: * As far as I am concerned, the code I have written for this software
7: * can be used freely for any purpose. Any derived versions of this
8: * software must be clearly marked as such, and if the derived work is
9: * incompatible with the protocol description in the RFC file, it must be
10: * called by a name other than "ssh" or "Secure Shell".
11: *
1.2 markus 12: * SSH2 support by Markus Friedl.
1.95 markus 13: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
1.37 deraadt 14: *
15: * Redistribution and use in source and binary forms, with or without
16: * modification, are permitted provided that the following conditions
17: * are met:
18: * 1. Redistributions of source code must retain the above copyright
19: * notice, this list of conditions and the following disclaimer.
20: * 2. Redistributions in binary form must reproduce the above copyright
21: * notice, this list of conditions and the following disclaimer in the
22: * documentation and/or other materials provided with the distribution.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.2 markus 34: */
1.1 markus 35:
1.193 stevesk 36: #include <sys/types.h>
37: #include <sys/wait.h>
1.194 stevesk 38: #include <sys/un.h>
1.196 stevesk 39: #include <sys/stat.h>
1.207 stevesk 40: #include <sys/socket.h>
1.213 stevesk 41: #include <sys/param.h>
1.192 stevesk 42:
1.209 stevesk 43: #include <errno.h>
1.204 stevesk 44: #include <grp.h>
1.192 stevesk 45: #include <paths.h>
1.206 stevesk 46: #include <pwd.h>
1.195 stevesk 47: #include <signal.h>
1.215 stevesk 48: #include <stdio.h>
1.214 stevesk 49: #include <stdlib.h>
1.212 stevesk 50: #include <string.h>
1.211 stevesk 51: #include <unistd.h>
1.1 markus 52:
1.216 deraadt 53: #include "xmalloc.h"
1.51 markus 54: #include "ssh.h"
55: #include "ssh1.h"
56: #include "ssh2.h"
1.59 djm 57: #include "sshpty.h"
1.1 markus 58: #include "packet.h"
59: #include "buffer.h"
1.173 djm 60: #include "match.h"
1.1 markus 61: #include "uidswap.h"
62: #include "compat.h"
1.78 markus 63: #include "channels.h"
1.216 deraadt 64: #include "key.h"
65: #include "cipher.h"
66: #include "kex.h"
67: #include "hostfile.h"
1.2 markus 68: #include "auth.h"
1.19 markus 69: #include "auth-options.h"
1.50 markus 70: #include "pathnames.h"
1.51 markus 71: #include "log.h"
72: #include "servconf.h"
1.59 djm 73: #include "sshlogin.h"
1.51 markus 74: #include "serverloop.h"
75: #include "canohost.h"
1.55 itojun 76: #include "session.h"
1.216 deraadt 77: #ifdef GSSAPI
78: #include "ssh-gss.h"
79: #endif
1.130 provos 80: #include "monitor_wrap.h"
1.171 markus 81:
82: #ifdef KRB5
83: #include <kafs.h>
1.161 markus 84: #endif
85:
1.1 markus 86: /* func */
87:
88: Session *session_new(void);
1.94 itojun 89: void session_set_fds(Session *, int, int, int);
1.165 markus 90: void session_pty_cleanup(Session *);
1.94 itojun 91: void session_proctitle(Session *);
92: int session_setup_x11fwd(Session *);
93: void do_exec_pty(Session *, const char *);
94: void do_exec_no_pty(Session *, const char *);
95: void do_exec(Session *, const char *);
96: void do_login(Session *, const char *);
97: void do_child(Session *, const char *);
1.73 djm 98: void do_motd(void);
1.94 itojun 99: int check_quietlogin(Session *, const char *);
1.1 markus 100:
1.94 itojun 101: static void do_authenticated1(Authctxt *);
102: static void do_authenticated2(Authctxt *);
103:
104: static int session_pty_req(Session *);
1.65 markus 105:
1.1 markus 106: /* import */
107: extern ServerOptions options;
108: extern char *__progname;
109: extern int log_stderr;
110: extern int debug_flag;
1.45 markus 111: extern u_int utmp_len;
1.21 markus 112: extern int startup_pipe;
1.74 markus 113: extern void destroy_sensitive_data(void);
1.179 dtucker 114: extern Buffer loginmsg;
1.21 markus 115:
1.34 markus 116: /* original command from peer. */
1.92 markus 117: const char *original_command = NULL;
1.34 markus 118:
1.1 markus 119: /* data */
120: #define MAX_SESSIONS 10
121: Session sessions[MAX_SESSIONS];
122:
1.129 provos 123: login_cap_t *lc;
1.28 millert 124:
1.165 markus 125: static int is_child = 0;
126:
1.136 markus 127: /* Name and directory of socket for authentication agent forwarding. */
128: static char *auth_sock_name = NULL;
129: static char *auth_sock_dir = NULL;
130:
131: /* removes the agent forwarding socket */
132:
133: static void
1.165 markus 134: auth_sock_cleanup_proc(struct passwd *pw)
1.136 markus 135: {
136: if (auth_sock_name != NULL) {
137: temporarily_use_uid(pw);
138: unlink(auth_sock_name);
139: rmdir(auth_sock_dir);
140: auth_sock_name = NULL;
141: restore_uid();
142: }
143: }
144:
145: static int
146: auth_input_request_forwarding(struct passwd * pw)
147: {
148: Channel *nc;
149: int sock;
150: struct sockaddr_un sunaddr;
151:
152: if (auth_sock_name != NULL) {
153: error("authentication forwarding requested twice.");
154: return 0;
155: }
156:
157: /* Temporarily drop privileged uid for mkdir/bind. */
158: temporarily_use_uid(pw);
159:
160: /* Allocate a buffer for the socket name, and format the name. */
161: auth_sock_name = xmalloc(MAXPATHLEN);
162: auth_sock_dir = xmalloc(MAXPATHLEN);
1.166 markus 163: strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
1.136 markus 164:
165: /* Create private directory for socket */
166: if (mkdtemp(auth_sock_dir) == NULL) {
167: packet_send_debug("Agent forwarding disabled: "
168: "mkdtemp() failed: %.100s", strerror(errno));
169: restore_uid();
170: xfree(auth_sock_name);
171: xfree(auth_sock_dir);
172: auth_sock_name = NULL;
173: auth_sock_dir = NULL;
174: return 0;
175: }
1.137 mpech 176: snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld",
177: auth_sock_dir, (long) getpid());
1.136 markus 178:
179: /* Create the socket. */
180: sock = socket(AF_UNIX, SOCK_STREAM, 0);
181: if (sock < 0)
182: packet_disconnect("socket: %.100s", strerror(errno));
183:
184: /* Bind it to the name. */
185: memset(&sunaddr, 0, sizeof(sunaddr));
186: sunaddr.sun_family = AF_UNIX;
187: strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
188:
1.200 deraadt 189: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0)
1.136 markus 190: packet_disconnect("bind: %.100s", strerror(errno));
191:
192: /* Restore the privileged uid. */
193: restore_uid();
194:
195: /* Start listening on the socket. */
1.169 markus 196: if (listen(sock, SSH_LISTEN_BACKLOG) < 0)
1.136 markus 197: packet_disconnect("listen: %.100s", strerror(errno));
198:
199: /* Allocate a channel for the authentication agent socket. */
200: nc = channel_new("auth socket",
201: SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
202: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1.156 markus 203: 0, "auth socket", 1);
1.136 markus 204: strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
205: return 1;
206: }
207:
1.179 dtucker 208: static void
209: display_loginmsg(void)
210: {
1.183 djm 211: if (buffer_len(&loginmsg) > 0) {
212: buffer_append(&loginmsg, "\0", 1);
213: printf("%s", (char *)buffer_ptr(&loginmsg));
214: buffer_clear(&loginmsg);
215: }
1.179 dtucker 216: }
1.136 markus 217:
1.65 markus 218: void
219: do_authenticated(Authctxt *authctxt)
220: {
1.153 markus 221: setproctitle("%s", authctxt->pw->pw_name);
222:
1.65 markus 223: /* setup the channel layer */
224: if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
225: channel_permit_all_opens();
226:
227: if (compat20)
228: do_authenticated2(authctxt);
229: else
230: do_authenticated1(authctxt);
1.79 markus 231:
1.165 markus 232: do_cleanup(authctxt);
1.65 markus 233: }
234:
1.1 markus 235: /*
236: * Prepares for an interactive session. This is called after the user has
237: * been successfully authenticated. During this message exchange, pseudo
238: * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
239: * are requested, etc.
240: */
1.94 itojun 241: static void
1.65 markus 242: do_authenticated1(Authctxt *authctxt)
1.1 markus 243: {
244: Session *s;
1.65 markus 245: char *command;
1.117 markus 246: int success, type, screen_flag;
1.139 deraadt 247: int enable_compression_after_reply = 0;
248: u_int proto_len, data_len, dlen, compression_level = 0;
1.1 markus 249:
1.61 markus 250: s = session_new();
1.181 markus 251: if (s == NULL) {
252: error("no more sessions");
253: return;
254: }
1.96 dugsong 255: s->authctxt = authctxt;
1.65 markus 256: s->pw = authctxt->pw;
1.28 millert 257:
1.1 markus 258: /*
259: * We stay in this loop until the client requests to execute a shell
260: * or a command.
261: */
262: for (;;) {
1.65 markus 263: success = 0;
1.1 markus 264:
265: /* Get a packet from the client. */
1.117 markus 266: type = packet_read();
1.1 markus 267:
268: /* Process the packet. */
269: switch (type) {
270: case SSH_CMSG_REQUEST_COMPRESSION:
271: compression_level = packet_get_int();
1.116 markus 272: packet_check_eom();
1.1 markus 273: if (compression_level < 1 || compression_level > 9) {
1.180 markus 274: packet_send_debug("Received invalid compression level %d.",
1.112 deraadt 275: compression_level);
1.138 markus 276: break;
277: }
1.186 markus 278: if (options.compression == COMP_NONE) {
1.138 markus 279: debug2("compression disabled");
1.1 markus 280: break;
281: }
282: /* Enable compression after we have responded with SUCCESS. */
283: enable_compression_after_reply = 1;
284: success = 1;
285: break;
286:
287: case SSH_CMSG_REQUEST_PTY:
1.86 markus 288: success = session_pty_req(s);
1.1 markus 289: break;
290:
291: case SSH_CMSG_X11_REQUEST_FORWARDING:
292: s->auth_proto = packet_get_string(&proto_len);
293: s->auth_data = packet_get_string(&data_len);
294:
1.57 markus 295: screen_flag = packet_get_protocol_flags() &
296: SSH_PROTOFLAG_SCREEN_NUMBER;
297: debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
298:
299: if (packet_remaining() == 4) {
300: if (!screen_flag)
301: debug2("Buggy client: "
302: "X11 screen flag missing");
1.1 markus 303: s->screen = packet_get_int();
1.56 markus 304: } else {
1.1 markus 305: s->screen = 0;
1.56 markus 306: }
1.116 markus 307: packet_check_eom();
1.81 markus 308: success = session_setup_x11fwd(s);
309: if (!success) {
310: xfree(s->auth_proto);
311: xfree(s->auth_data);
1.84 markus 312: s->auth_proto = NULL;
313: s->auth_data = NULL;
1.1 markus 314: }
315: break;
316:
317: case SSH_CMSG_AGENT_REQUEST_FORWARDING:
318: if (no_agent_forwarding_flag || compat13) {
319: debug("Authentication agent forwarding not permitted for this authentication.");
320: break;
321: }
322: debug("Received authentication agent forwarding request.");
1.65 markus 323: success = auth_input_request_forwarding(s->pw);
1.1 markus 324: break;
325:
326: case SSH_CMSG_PORT_FORWARD_REQUEST:
327: if (no_port_forwarding_flag) {
328: debug("Port forwarding not permitted for this authentication.");
1.39 markus 329: break;
330: }
331: if (!options.allow_tcp_forwarding) {
332: debug("Port forwarding not permitted.");
1.1 markus 333: break;
334: }
335: debug("Received TCP/IP port forwarding request.");
1.208 markus 336: if (channel_input_port_forward_request(s->pw->pw_uid == 0,
337: options.gateway_ports) < 0) {
338: debug("Port forwarding failed.");
339: break;
340: }
1.1 markus 341: success = 1;
342: break;
343:
344: case SSH_CMSG_MAX_PACKET_SIZE:
345: if (packet_set_maxsize(packet_get_int()) > 0)
346: success = 1;
347: break;
348:
349: case SSH_CMSG_EXEC_SHELL:
350: case SSH_CMSG_EXEC_CMD:
351: if (type == SSH_CMSG_EXEC_CMD) {
352: command = packet_get_string(&dlen);
353: debug("Exec command '%.500s'", command);
1.92 markus 354: do_exec(s, command);
355: xfree(command);
1.1 markus 356: } else {
1.92 markus 357: do_exec(s, NULL);
1.1 markus 358: }
1.116 markus 359: packet_check_eom();
1.82 markus 360: session_close(s);
1.1 markus 361: return;
362:
363: default:
364: /*
365: * Any unknown messages in this phase are ignored,
366: * and a failure message is returned.
367: */
1.155 itojun 368: logit("Unknown packet type received after authentication: %d", type);
1.1 markus 369: }
370: packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
371: packet_send();
372: packet_write_wait();
373:
374: /* Enable compression now that we have replied if appropriate. */
375: if (enable_compression_after_reply) {
376: enable_compression_after_reply = 0;
377: packet_start_compression(compression_level);
378: }
379: }
380: }
381:
382: /*
383: * This is called to fork and execute a command when we have no tty. This
384: * will call do_child from the child, and server_loop from the parent after
385: * setting up file descriptors and such.
386: */
1.4 markus 387: void
1.63 markus 388: do_exec_no_pty(Session *s, const char *command)
1.1 markus 389: {
1.137 mpech 390: pid_t pid;
1.1 markus 391:
392: int inout[2], err[2];
393: /* Uses socket pairs to communicate with the program. */
394: if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
395: socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
396: packet_disconnect("Could not create socket pairs: %.100s",
397: strerror(errno));
398: if (s == NULL)
399: fatal("do_exec_no_pty: no session");
400:
1.9 markus 401: session_proctitle(s);
1.1 markus 402:
403: /* Fork the child. */
404: if ((pid = fork()) == 0) {
1.165 markus 405: is_child = 1;
1.144 markus 406:
1.1 markus 407: /* Child. Reinitialize the log since the pid has changed. */
408: log_init(__progname, options.log_level, options.log_facility, log_stderr);
409:
410: /*
411: * Create a new session and process group since the 4.4BSD
412: * setlogin() affects the entire process group.
413: */
414: if (setsid() < 0)
415: error("setsid failed: %.100s", strerror(errno));
416:
417: /*
418: * Redirect stdin, stdout, and stderr. Stdin and stdout will
419: * use the same socket, as some programs (particularly rdist)
420: * seem to depend on it.
421: */
422: close(inout[1]);
423: close(err[1]);
424: if (dup2(inout[0], 0) < 0) /* stdin */
425: perror("dup2 stdin");
426: if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
427: perror("dup2 stdout");
428: if (dup2(err[0], 2) < 0) /* stderr */
429: perror("dup2 stderr");
430:
431: /* Do processing for the child (exec command etc). */
1.60 markus 432: do_child(s, command);
1.1 markus 433: /* NOTREACHED */
434: }
435: if (pid < 0)
436: packet_disconnect("fork failed: %.100s", strerror(errno));
437: s->pid = pid;
1.47 markus 438: /* Set interactive/non-interactive mode. */
1.48 markus 439: packet_set_interactive(s->display != NULL);
1.1 markus 440:
441: /* We are the parent. Close the child sides of the socket pairs. */
442: close(inout[0]);
443: close(err[0]);
444:
445: /*
446: * Enter the interactive session. Note: server_loop must be able to
447: * handle the case that fdin and fdout are the same.
448: */
1.2 markus 449: if (compat20) {
1.64 markus 450: session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
1.2 markus 451: } else {
452: server_loop(pid, inout[1], inout[1], err[1]);
453: /* server_loop has closed inout[1] and err[1]. */
454: }
1.1 markus 455: }
456:
457: /*
458: * This is called to fork and execute a command when we have a tty. This
459: * will call do_child from the child, and server_loop from the parent after
460: * setting up file descriptors, controlling tty, updating wtmp, utmp,
461: * lastlog, and other such operations.
462: */
1.4 markus 463: void
1.63 markus 464: do_exec_pty(Session *s, const char *command)
1.1 markus 465: {
466: int fdout, ptyfd, ttyfd, ptymaster;
467: pid_t pid;
468:
469: if (s == NULL)
470: fatal("do_exec_pty: no session");
471: ptyfd = s->ptyfd;
472: ttyfd = s->ttyfd;
473:
474: /* Fork the child. */
475: if ((pid = fork()) == 0) {
1.165 markus 476: is_child = 1;
1.97 markus 477:
1.24 markus 478: /* Child. Reinitialize the log because the pid has changed. */
1.1 markus 479: log_init(__progname, options.log_level, options.log_facility, log_stderr);
480: /* Close the master side of the pseudo tty. */
481: close(ptyfd);
482:
483: /* Make the pseudo tty our controlling tty. */
484: pty_make_controlling_tty(&ttyfd, s->tty);
485:
1.103 markus 486: /* Redirect stdin/stdout/stderr from the pseudo tty. */
487: if (dup2(ttyfd, 0) < 0)
488: error("dup2 stdin: %s", strerror(errno));
489: if (dup2(ttyfd, 1) < 0)
490: error("dup2 stdout: %s", strerror(errno));
491: if (dup2(ttyfd, 2) < 0)
492: error("dup2 stderr: %s", strerror(errno));
1.1 markus 493:
494: /* Close the extra descriptor for the pseudo tty. */
495: close(ttyfd);
496:
1.24 markus 497: /* record login, etc. similar to login(1) */
1.41 markus 498: if (!(options.use_login && command == NULL))
499: do_login(s, command);
1.1 markus 500:
501: /* Do common processing for the child, such as execing the command. */
1.60 markus 502: do_child(s, command);
1.1 markus 503: /* NOTREACHED */
504: }
505: if (pid < 0)
506: packet_disconnect("fork failed: %.100s", strerror(errno));
507: s->pid = pid;
508:
509: /* Parent. Close the slave side of the pseudo tty. */
510: close(ttyfd);
511:
512: /*
513: * Create another descriptor of the pty master side for use as the
514: * standard input. We could use the original descriptor, but this
515: * simplifies code in server_loop. The descriptor is bidirectional.
516: */
517: fdout = dup(ptyfd);
518: if (fdout < 0)
519: packet_disconnect("dup #1 failed: %.100s", strerror(errno));
520:
521: /* we keep a reference to the pty master */
522: ptymaster = dup(ptyfd);
523: if (ptymaster < 0)
524: packet_disconnect("dup #2 failed: %.100s", strerror(errno));
525: s->ptymaster = ptymaster;
526:
527: /* Enter interactive session. */
1.47 markus 528: packet_set_interactive(1);
1.2 markus 529: if (compat20) {
530: session_set_fds(s, ptyfd, fdout, -1);
531: } else {
532: server_loop(pid, ptyfd, fdout, -1);
533: /* server_loop _has_ closed ptyfd and fdout. */
1.24 markus 534: }
535: }
536:
1.90 markus 537: /*
538: * This is called to fork and execute a command. If another command is
539: * to be forced, execute that instead.
540: */
541: void
542: do_exec(Session *s, const char *command)
543: {
1.210 dtucker 544: if (options.adm_forced_command) {
545: original_command = command;
546: command = options.adm_forced_command;
547: debug("Forced command (config) '%.900s'", command);
548: } else if (forced_command) {
1.90 markus 549: original_command = command;
550: command = forced_command;
1.210 dtucker 551: debug("Forced command (key option) '%.900s'", command);
1.90 markus 552: }
1.163 markus 553:
554: #ifdef GSSAPI
555: if (options.gss_authentication) {
556: temporarily_use_uid(s->pw);
557: ssh_gssapi_storecreds();
558: restore_uid();
559: }
560: #endif
1.90 markus 561:
562: if (s->ttyfd != -1)
563: do_exec_pty(s, command);
564: else
565: do_exec_no_pty(s, command);
566:
1.92 markus 567: original_command = NULL;
1.179 dtucker 568:
569: /*
570: * Clear loginmsg: it's the child's responsibility to display
571: * it to the user, otherwise multiple sessions may accumulate
572: * multiple copies of the login messages.
573: */
574: buffer_clear(&loginmsg);
1.90 markus 575: }
576:
577:
1.24 markus 578: /* administrative, login(1)-like work */
579: void
1.41 markus 580: do_login(Session *s, const char *command)
1.24 markus 581: {
582: socklen_t fromlen;
583: struct sockaddr_storage from;
584: struct passwd * pw = s->pw;
585: pid_t pid = getpid();
586:
587: /*
588: * Get IP address of client. If the connection is not a socket, let
589: * the address be 0.0.0.0.
590: */
591: memset(&from, 0, sizeof(from));
1.148 stevesk 592: fromlen = sizeof(from);
1.24 markus 593: if (packet_connection_is_on_socket()) {
594: if (getpeername(packet_get_connection_in(),
1.200 deraadt 595: (struct sockaddr *)&from, &fromlen) < 0) {
1.24 markus 596: debug("getpeername: %.100s", strerror(errno));
1.165 markus 597: cleanup_exit(255);
1.24 markus 598: }
599: }
1.25 markus 600:
1.24 markus 601: /* Record that there was a login on that tty from the remote host. */
1.133 markus 602: if (!use_privsep)
603: record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
604: get_remote_name_or_ip(utmp_len,
1.158 markus 605: options.use_dns),
1.148 stevesk 606: (struct sockaddr *)&from, fromlen);
1.24 markus 607:
1.73 djm 608: if (check_quietlogin(s, command))
1.24 markus 609: return;
1.73 djm 610:
1.179 dtucker 611: display_loginmsg();
1.73 djm 612:
613: do_motd();
614: }
615:
616: /*
617: * Display the message of the day.
618: */
619: void
620: do_motd(void)
621: {
622: FILE *f;
623: char buf[256];
624:
1.24 markus 625: if (options.print_motd) {
1.28 millert 626: f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
627: "/etc/motd"), "r");
1.24 markus 628: if (f) {
629: while (fgets(buf, sizeof(buf), f))
630: fputs(buf, stdout);
631: fclose(f);
632: }
1.2 markus 633: }
1.73 djm 634: }
635:
636:
637: /*
638: * Check for quiet login, either .hushlogin or command given.
639: */
640: int
641: check_quietlogin(Session *s, const char *command)
642: {
643: char buf[256];
1.96 dugsong 644: struct passwd *pw = s->pw;
1.73 djm 645: struct stat st;
646:
647: /* Return 1 if .hushlogin exists or a command given. */
648: if (command != NULL)
649: return 1;
650: snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
651: if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
652: return 1;
653: return 0;
1.1 markus 654: }
655:
656: /*
657: * Sets the value of the given variable in the environment. If the variable
658: * already exists, its value is overriden.
659: */
1.161 markus 660: void
1.45 markus 661: child_set_env(char ***envp, u_int *envsizep, const char *name,
1.112 deraadt 662: const char *value)
1.1 markus 663: {
1.164 markus 664: char **env;
665: u_int envsize;
1.45 markus 666: u_int i, namelen;
1.1 markus 667:
668: /*
669: * Find the slot where the value should be stored. If the variable
670: * already exists, we reuse the slot; otherwise we append a new slot
671: * at the end of the array, expanding if necessary.
672: */
673: env = *envp;
674: namelen = strlen(name);
675: for (i = 0; env[i]; i++)
676: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
677: break;
678: if (env[i]) {
679: /* Reuse the slot. */
680: xfree(env[i]);
681: } else {
682: /* New variable. Expand if necessary. */
1.164 markus 683: envsize = *envsizep;
684: if (i >= envsize - 1) {
685: if (envsize >= 1000)
686: fatal("child_set_env: too many env vars");
687: envsize += 50;
1.201 djm 688: env = (*envp) = xrealloc(env, envsize, sizeof(char *));
1.164 markus 689: *envsizep = envsize;
1.1 markus 690: }
691: /* Need to set the NULL pointer at end of array beyond the new slot. */
692: env[i + 1] = NULL;
693: }
694:
695: /* Allocate space and format the variable in the appropriate slot. */
696: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
697: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
698: }
699:
700: /*
701: * Reads environment variables from the given file and adds/overrides them
702: * into the environment. If the file does not exist, this does nothing.
703: * Otherwise, it must consist of empty lines, comments (line starts with '#')
704: * and assignments of the form name=value. No other forms are allowed.
705: */
1.94 itojun 706: static void
1.45 markus 707: read_environment_file(char ***env, u_int *envsize,
1.112 deraadt 708: const char *filename)
1.1 markus 709: {
710: FILE *f;
711: char buf[4096];
712: char *cp, *value;
1.142 deraadt 713: u_int lineno = 0;
1.1 markus 714:
715: f = fopen(filename, "r");
716: if (!f)
717: return;
718:
719: while (fgets(buf, sizeof(buf), f)) {
1.142 deraadt 720: if (++lineno > 1000)
721: fatal("Too many lines in environment file %s", filename);
1.1 markus 722: for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
723: ;
724: if (!*cp || *cp == '#' || *cp == '\n')
725: continue;
726: if (strchr(cp, '\n'))
727: *strchr(cp, '\n') = '\0';
728: value = strchr(cp, '=');
729: if (value == NULL) {
1.142 deraadt 730: fprintf(stderr, "Bad line %u in %.100s\n", lineno,
731: filename);
1.1 markus 732: continue;
733: }
1.14 deraadt 734: /*
735: * Replace the equals sign by nul, and advance value to
736: * the value string.
737: */
1.1 markus 738: *value = '\0';
739: value++;
740: child_set_env(env, envsize, cp, value);
741: }
742: fclose(f);
743: }
744:
1.127 markus 745: static char **
746: do_setup_env(Session *s, const char *shell)
1.1 markus 747: {
748: char buf[256];
1.127 markus 749: u_int i, envsize;
1.154 markus 750: char **env, *laddr;
1.127 markus 751: struct passwd *pw = s->pw;
1.1 markus 752:
753: /* Initialize the environment. */
754: envsize = 100;
1.220 djm 755: env = xcalloc(envsize, sizeof(char *));
1.1 markus 756: env[0] = NULL;
757:
1.161 markus 758: #ifdef GSSAPI
1.168 djm 759: /* Allow any GSSAPI methods that we've used to alter
1.161 markus 760: * the childs environment as they see fit
761: */
762: ssh_gssapi_do_child(&env, &envsize);
763: #endif
764:
1.1 markus 765: if (!options.use_login) {
766: /* Set basic environment. */
1.173 djm 767: for (i = 0; i < s->num_env; i++)
1.178 deraadt 768: child_set_env(&env, &envsize, s->env[i].name,
1.173 djm 769: s->env[i].val);
770:
1.1 markus 771: child_set_env(&env, &envsize, "USER", pw->pw_name);
772: child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
773: child_set_env(&env, &envsize, "HOME", pw->pw_dir);
1.145 markus 774: if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
775: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
776: else
777: child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1.1 markus 778:
779: snprintf(buf, sizeof buf, "%.200s/%.50s",
780: _PATH_MAILDIR, pw->pw_name);
781: child_set_env(&env, &envsize, "MAIL", buf);
782:
783: /* Normal systems set SHELL by default. */
784: child_set_env(&env, &envsize, "SHELL", shell);
785: }
786: if (getenv("TZ"))
787: child_set_env(&env, &envsize, "TZ", getenv("TZ"));
788:
789: /* Set custom environment options from RSA authentication. */
1.110 markus 790: if (!options.use_login) {
791: while (custom_environment) {
792: struct envstring *ce = custom_environment;
1.143 deraadt 793: char *str = ce->s;
1.127 markus 794:
1.143 deraadt 795: for (i = 0; str[i] != '=' && str[i]; i++)
1.110 markus 796: ;
1.143 deraadt 797: if (str[i] == '=') {
798: str[i] = 0;
799: child_set_env(&env, &envsize, str, str + i + 1);
1.110 markus 800: }
801: custom_environment = ce->next;
802: xfree(ce->s);
803: xfree(ce);
1.1 markus 804: }
805: }
806:
1.149 stevesk 807: /* SSH_CLIENT deprecated */
1.1 markus 808: snprintf(buf, sizeof buf, "%.50s %d %d",
1.127 markus 809: get_remote_ipaddr(), get_remote_port(), get_local_port());
1.1 markus 810: child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1.149 stevesk 811:
1.154 markus 812: laddr = get_local_ipaddr(packet_get_connection_in());
1.149 stevesk 813: snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1.154 markus 814: get_remote_ipaddr(), get_remote_port(), laddr, get_local_port());
815: xfree(laddr);
1.149 stevesk 816: child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1.1 markus 817:
1.60 markus 818: if (s->ttyfd != -1)
819: child_set_env(&env, &envsize, "SSH_TTY", s->tty);
820: if (s->term)
821: child_set_env(&env, &envsize, "TERM", s->term);
822: if (s->display)
823: child_set_env(&env, &envsize, "DISPLAY", s->display);
1.34 markus 824: if (original_command)
825: child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
826: original_command);
1.96 dugsong 827: #ifdef KRB5
828: if (s->authctxt->krb5_ticket_file)
829: child_set_env(&env, &envsize, "KRB5CCNAME",
1.112 deraadt 830: s->authctxt->krb5_ticket_file);
1.96 dugsong 831: #endif
1.136 markus 832: if (auth_sock_name != NULL)
1.1 markus 833: child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1.136 markus 834: auth_sock_name);
1.1 markus 835:
836: /* read $HOME/.ssh/environment. */
1.146 markus 837: if (options.permit_user_env && !options.use_login) {
1.14 deraadt 838: snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
839: pw->pw_dir);
1.1 markus 840: read_environment_file(&env, &envsize, buf);
841: }
842: if (debug_flag) {
843: /* dump the environment */
844: fprintf(stderr, "Environment:\n");
845: for (i = 0; env[i]; i++)
846: fprintf(stderr, " %.200s\n", env[i]);
847: }
1.127 markus 848: return env;
849: }
850:
851: /*
852: * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
853: * first in this order).
854: */
855: static void
856: do_rc_files(Session *s, const char *shell)
857: {
858: FILE *f = NULL;
859: char cmd[1024];
860: int do_xauth;
861: struct stat st;
862:
863: do_xauth =
864: s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
865:
866: /* ignore _PATH_SSH_USER_RC for subsystems */
867: if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
868: snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
869: shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
870: if (debug_flag)
871: fprintf(stderr, "Running %s\n", cmd);
872: f = popen(cmd, "w");
873: if (f) {
874: if (do_xauth)
875: fprintf(f, "%s %s\n", s->auth_proto,
876: s->auth_data);
877: pclose(f);
878: } else
879: fprintf(stderr, "Could not run %s\n",
880: _PATH_SSH_USER_RC);
881: } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
882: if (debug_flag)
883: fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
884: _PATH_SSH_SYSTEM_RC);
885: f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
886: if (f) {
887: if (do_xauth)
888: fprintf(f, "%s %s\n", s->auth_proto,
889: s->auth_data);
890: pclose(f);
891: } else
892: fprintf(stderr, "Could not run %s\n",
893: _PATH_SSH_SYSTEM_RC);
894: } else if (do_xauth && options.xauth_location != NULL) {
895: /* Add authority data to .Xauthority if appropriate. */
896: if (debug_flag) {
897: fprintf(stderr,
1.151 stevesk 898: "Running %.500s remove %.100s\n",
1.165 markus 899: options.xauth_location, s->auth_display);
1.151 stevesk 900: fprintf(stderr,
901: "%.500s add %.100s %.100s %.100s\n",
1.127 markus 902: options.xauth_location, s->auth_display,
903: s->auth_proto, s->auth_data);
904: }
905: snprintf(cmd, sizeof cmd, "%s -q -",
906: options.xauth_location);
907: f = popen(cmd, "w");
908: if (f) {
1.151 stevesk 909: fprintf(f, "remove %s\n",
910: s->auth_display);
1.127 markus 911: fprintf(f, "add %s %s %s\n",
912: s->auth_display, s->auth_proto,
913: s->auth_data);
914: pclose(f);
915: } else {
916: fprintf(stderr, "Could not run %s\n",
917: cmd);
918: }
919: }
920: }
921:
922: static void
923: do_nologin(struct passwd *pw)
924: {
925: FILE *f = NULL;
926: char buf[1024];
927:
928: if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
929: f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
930: _PATH_NOLOGIN), "r");
931: if (f) {
932: /* /etc/nologin exists. Print its contents and exit. */
1.155 itojun 933: logit("User %.100s not allowed because %s exists",
1.150 stevesk 934: pw->pw_name, _PATH_NOLOGIN);
1.127 markus 935: while (fgets(buf, sizeof(buf), f))
936: fputs(buf, stderr);
937: fclose(f);
938: exit(254);
939: }
940: }
941:
942: /* Set login name, uid, gid, and groups. */
1.130 provos 943: void
1.127 markus 944: do_setusercontext(struct passwd *pw)
945: {
946: if (getuid() == 0 || geteuid() == 0) {
947: if (setusercontext(lc, pw, pw->pw_uid,
948: (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
949: perror("unable to set user context");
950: exit(1);
951: }
952: }
953: if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
954: fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
955: }
956:
1.131 markus 957: static void
1.172 markus 958: do_pwchange(Session *s)
959: {
1.179 dtucker 960: fflush(NULL);
1.172 markus 961: fprintf(stderr, "WARNING: Your password has expired.\n");
962: if (s->ttyfd != -1) {
1.178 deraadt 963: fprintf(stderr,
1.172 markus 964: "You must change your password now and login again!\n");
965: execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
966: perror("passwd");
967: } else {
968: fprintf(stderr,
969: "Password change required but no TTY available.\n");
970: }
971: exit(1);
972: }
973:
974: static void
1.130 provos 975: launch_login(struct passwd *pw, const char *hostname)
976: {
977: /* Launch login(1). */
978:
979: execl("/usr/bin/login", "login", "-h", hostname,
980: "-p", "-f", "--", pw->pw_name, (char *)NULL);
981:
982: /* Login couldn't be executed, die. */
983:
984: perror("login");
985: exit(1);
986: }
987:
1.172 markus 988: static void
989: child_close_fds(void)
990: {
991: int i;
992:
993: if (packet_get_connection_in() == packet_get_connection_out())
994: close(packet_get_connection_in());
995: else {
996: close(packet_get_connection_in());
997: close(packet_get_connection_out());
998: }
999: /*
1000: * Close all descriptors related to channels. They will still remain
1001: * open in the parent.
1002: */
1003: /* XXX better use close-on-exec? -markus */
1004: channel_close_all();
1005:
1006: /*
1007: * Close any extra file descriptors. Note that there may still be
1008: * descriptors left by system functions. They will be closed later.
1009: */
1010: endpwent();
1011:
1012: /*
1.188 djm 1013: * Close any extra open file descriptors so that we don't have them
1.172 markus 1014: * hanging around in clients. Note that we want to do this after
1015: * initgroups, because at least on Solaris 2.3 it leaves file
1016: * descriptors open.
1017: */
1018: for (i = 3; i < 64; i++)
1019: close(i);
1020: }
1021:
1.127 markus 1022: /*
1023: * Performs common processing for the child, such as setting up the
1024: * environment, closing extra file descriptors, setting the user and group
1025: * ids, and executing the command or shell.
1026: */
1027: void
1028: do_child(Session *s, const char *command)
1029: {
1030: extern char **environ;
1031: char **env;
1032: char *argv[10];
1033: const char *shell, *shell0, *hostname = NULL;
1034: struct passwd *pw = s->pw;
1035:
1036: /* remove hostkey from the child's memory */
1037: destroy_sensitive_data();
1038:
1.172 markus 1039: /* Force a password change */
1040: if (s->authctxt->force_pwchange) {
1041: do_setusercontext(pw);
1042: child_close_fds();
1043: do_pwchange(s);
1044: exit(1);
1045: }
1046:
1.127 markus 1047: /* login(1) is only called if we execute the login shell */
1048: if (options.use_login && command != NULL)
1049: options.use_login = 0;
1050:
1051: /*
1052: * Login(1) does this as well, and it needs uid 0 for the "-h"
1053: * switch, so we let login(1) to this for us.
1054: */
1055: if (!options.use_login) {
1056: do_nologin(pw);
1057: do_setusercontext(pw);
1058: }
1059:
1060: /*
1061: * Get the shell from the password data. An empty shell field is
1062: * legal, and means /bin/sh.
1063: */
1064: shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1.152 markus 1065:
1066: /*
1067: * Make sure $SHELL points to the shell from the password file,
1068: * even if shell is overridden from login.conf
1069: */
1070: env = do_setup_env(s, shell);
1071:
1.127 markus 1072: shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1073:
1.26 millert 1074: /* we have to stash the hostname before we close our socket. */
1075: if (options.use_login)
1.70 stevesk 1076: hostname = get_remote_name_or_ip(utmp_len,
1.158 markus 1077: options.use_dns);
1.1 markus 1078: /*
1079: * Close the connection descriptors; note that this is the child, and
1080: * the server will still have the socket open, and it is important
1081: * that we do not shutdown it. Note that the descriptors cannot be
1082: * closed before building the environment, as we call
1083: * get_remote_ipaddr there.
1084: */
1.172 markus 1085: child_close_fds();
1.1 markus 1086:
1087: /*
1.125 deraadt 1088: * Must take new environment into use so that .ssh/rc,
1089: * /etc/ssh/sshrc and xauth are run in the proper environment.
1.1 markus 1090: */
1091: environ = env;
1.170 jakob 1092:
1093: #ifdef KRB5
1094: /*
1095: * At this point, we check to see if AFS is active and if we have
1096: * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1097: * if we can (and need to) extend the ticket into an AFS token. If
1098: * we don't do this, we run into potential problems if the user's
1099: * home directory is in AFS and it's not world-readable.
1100: */
1101:
1102: if (options.kerberos_get_afs_token && k_hasafs() &&
1.185 djm 1103: (s->authctxt->krb5_ctx != NULL)) {
1.170 jakob 1104: char cell[64];
1105:
1106: debug("Getting AFS token");
1107:
1108: k_setpag();
1109:
1110: if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1111: krb5_afslog(s->authctxt->krb5_ctx,
1112: s->authctxt->krb5_fwd_ccache, cell, NULL);
1113:
1114: krb5_afslog_home(s->authctxt->krb5_ctx,
1115: s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1116: }
1117: #endif
1.104 markus 1118:
1.188 djm 1119: /* Change current directory to the user's home directory. */
1.104 markus 1120: if (chdir(pw->pw_dir) < 0) {
1121: fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1122: pw->pw_dir, strerror(errno));
1123: if (login_getcapbool(lc, "requirehome", 0))
1124: exit(1);
1125: }
1.1 markus 1126:
1.127 markus 1127: if (!options.use_login)
1128: do_rc_files(s, shell);
1.67 markus 1129:
1130: /* restore SIGPIPE for child */
1.217 stevesk 1131: signal(SIGPIPE, SIG_DFL);
1.67 markus 1132:
1.127 markus 1133: if (options.use_login) {
1.130 provos 1134: launch_login(pw, hostname);
1135: /* NEVERREACHED */
1.127 markus 1136: }
1137:
1138: /* Get the last component of the shell name. */
1139: if ((shell0 = strrchr(shell, '/')) != NULL)
1140: shell0++;
1141: else
1142: shell0 = shell;
1143:
1.1 markus 1144: /*
1145: * If we have no command, execute the shell. In this case, the shell
1146: * name to be passed in argv[0] is preceded by '-' to indicate that
1147: * this is a login shell.
1148: */
1149: if (!command) {
1.127 markus 1150: char argv0[256];
1.1 markus 1151:
1.127 markus 1152: /* Start the shell. Set initial character to '-'. */
1153: argv0[0] = '-';
1.1 markus 1154:
1.127 markus 1155: if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1.128 markus 1156: >= sizeof(argv0) - 1) {
1.127 markus 1157: errno = EINVAL;
1.1 markus 1158: perror(shell);
1159: exit(1);
1.127 markus 1160: }
1.1 markus 1161:
1.127 markus 1162: /* Execute the shell. */
1163: argv[0] = argv0;
1164: argv[1] = NULL;
1165: execve(shell, argv, env);
1166:
1167: /* Executing the shell failed. */
1168: perror(shell);
1169: exit(1);
1.1 markus 1170: }
1171: /*
1172: * Execute the command using the user's shell. This uses the -c
1173: * option to execute the command.
1174: */
1.127 markus 1175: argv[0] = (char *) shell0;
1.1 markus 1176: argv[1] = "-c";
1177: argv[2] = (char *) command;
1178: argv[3] = NULL;
1179: execve(shell, argv, env);
1180: perror(shell);
1181: exit(1);
1182: }
1183:
1184: Session *
1185: session_new(void)
1186: {
1187: int i;
1188: static int did_init = 0;
1189: if (!did_init) {
1190: debug("session_new: init");
1.112 deraadt 1191: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1192: sessions[i].used = 0;
1193: }
1194: did_init = 1;
1195: }
1.112 deraadt 1196: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1197: Session *s = &sessions[i];
1198: if (! s->used) {
1.68 djm 1199: memset(s, 0, sizeof(*s));
1.1 markus 1200: s->chanid = -1;
1201: s->ptyfd = -1;
1202: s->ttyfd = -1;
1203: s->used = 1;
1.85 markus 1204: s->self = i;
1.184 djm 1205: s->x11_chanids = NULL;
1.1 markus 1206: debug("session_new: session %d", i);
1207: return s;
1208: }
1209: }
1210: return NULL;
1211: }
1212:
1.94 itojun 1213: static void
1.1 markus 1214: session_dump(void)
1215: {
1216: int i;
1.112 deraadt 1217: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1218: Session *s = &sessions[i];
1.137 mpech 1219: debug("dump: used %d session %d %p channel %d pid %ld",
1.1 markus 1220: s->used,
1221: s->self,
1222: s,
1223: s->chanid,
1.137 mpech 1224: (long)s->pid);
1.1 markus 1225: }
1226: }
1227:
1.2 markus 1228: int
1.97 markus 1229: session_open(Authctxt *authctxt, int chanid)
1.2 markus 1230: {
1231: Session *s = session_new();
1232: debug("session_open: channel %d", chanid);
1233: if (s == NULL) {
1234: error("no more sessions");
1235: return 0;
1236: }
1.97 markus 1237: s->authctxt = authctxt;
1238: s->pw = authctxt->pw;
1.167 djm 1239: if (s->pw == NULL || !authctxt->valid)
1.54 stevesk 1240: fatal("no user for session %d", s->self);
1.2 markus 1241: debug("session_open: session %d: link with channel %d", s->self, chanid);
1242: s->chanid = chanid;
1243: return 1;
1244: }
1245:
1.130 provos 1246: Session *
1247: session_by_tty(char *tty)
1248: {
1249: int i;
1250: for (i = 0; i < MAX_SESSIONS; i++) {
1251: Session *s = &sessions[i];
1252: if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1253: debug("session_by_tty: session %d tty %s", i, tty);
1254: return s;
1255: }
1256: }
1257: debug("session_by_tty: unknown tty %.100s", tty);
1258: session_dump();
1259: return NULL;
1260: }
1261:
1.94 itojun 1262: static Session *
1.2 markus 1263: session_by_channel(int id)
1264: {
1265: int i;
1.112 deraadt 1266: for (i = 0; i < MAX_SESSIONS; i++) {
1.2 markus 1267: Session *s = &sessions[i];
1268: if (s->used && s->chanid == id) {
1269: debug("session_by_channel: session %d channel %d", i, id);
1270: return s;
1271: }
1272: }
1273: debug("session_by_channel: unknown channel %d", id);
1274: session_dump();
1275: return NULL;
1276: }
1277:
1.94 itojun 1278: static Session *
1.184 djm 1279: session_by_x11_channel(int id)
1280: {
1281: int i, j;
1282:
1283: for (i = 0; i < MAX_SESSIONS; i++) {
1284: Session *s = &sessions[i];
1285:
1286: if (s->x11_chanids == NULL || !s->used)
1287: continue;
1288: for (j = 0; s->x11_chanids[j] != -1; j++) {
1289: if (s->x11_chanids[j] == id) {
1290: debug("session_by_x11_channel: session %d "
1291: "channel %d", s->self, id);
1292: return s;
1293: }
1294: }
1295: }
1296: debug("session_by_x11_channel: unknown channel %d", id);
1297: session_dump();
1298: return NULL;
1299: }
1300:
1301: static Session *
1.2 markus 1302: session_by_pid(pid_t pid)
1303: {
1304: int i;
1.137 mpech 1305: debug("session_by_pid: pid %ld", (long)pid);
1.112 deraadt 1306: for (i = 0; i < MAX_SESSIONS; i++) {
1.2 markus 1307: Session *s = &sessions[i];
1308: if (s->used && s->pid == pid)
1309: return s;
1310: }
1.137 mpech 1311: error("session_by_pid: unknown pid %ld", (long)pid);
1.2 markus 1312: session_dump();
1313: return NULL;
1314: }
1315:
1.94 itojun 1316: static int
1.2 markus 1317: session_window_change_req(Session *s)
1318: {
1319: s->col = packet_get_int();
1320: s->row = packet_get_int();
1321: s->xpixel = packet_get_int();
1322: s->ypixel = packet_get_int();
1.116 markus 1323: packet_check_eom();
1.2 markus 1324: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1325: return 1;
1326: }
1327:
1.94 itojun 1328: static int
1.2 markus 1329: session_pty_req(Session *s)
1330: {
1.45 markus 1331: u_int len;
1.72 stevesk 1332: int n_bytes;
1.132 markus 1333:
1.86 markus 1334: if (no_pty_flag) {
1335: debug("Allocating a pty not permitted for this authentication.");
1.19 markus 1336: return 0;
1.86 markus 1337: }
1338: if (s->ttyfd != -1) {
1339: packet_disconnect("Protocol error: you already have a pty.");
1.3 markus 1340: return 0;
1.86 markus 1341: }
1342:
1.2 markus 1343: s->term = packet_get_string(&len);
1.86 markus 1344:
1345: if (compat20) {
1346: s->col = packet_get_int();
1347: s->row = packet_get_int();
1348: } else {
1349: s->row = packet_get_int();
1350: s->col = packet_get_int();
1351: }
1.2 markus 1352: s->xpixel = packet_get_int();
1353: s->ypixel = packet_get_int();
1354:
1355: if (strcmp(s->term, "") == 0) {
1356: xfree(s->term);
1357: s->term = NULL;
1358: }
1.86 markus 1359:
1.2 markus 1360: /* Allocate a pty and open it. */
1.86 markus 1361: debug("Allocating pty.");
1.130 provos 1362: if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
1.86 markus 1363: if (s->term)
1364: xfree(s->term);
1.2 markus 1365: s->term = NULL;
1366: s->ptyfd = -1;
1367: s->ttyfd = -1;
1368: error("session_pty_req: session %d alloc failed", s->self);
1.3 markus 1369: return 0;
1.2 markus 1370: }
1371: debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1.86 markus 1372:
1373: /* for SSH1 the tty modes length is not given */
1374: if (!compat20)
1375: n_bytes = packet_remaining();
1376: tty_parse_modes(s->ttyfd, &n_bytes);
1377:
1.130 provos 1378: if (!use_privsep)
1379: pty_setowner(s->pw, s->tty);
1.86 markus 1380:
1381: /* Set window size from the packet. */
1.2 markus 1382: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1383:
1.116 markus 1384: packet_check_eom();
1.9 markus 1385: session_proctitle(s);
1.2 markus 1386: return 1;
1387: }
1388:
1.94 itojun 1389: static int
1.7 markus 1390: session_subsystem_req(Session *s)
1391: {
1.105 markus 1392: struct stat st;
1.45 markus 1393: u_int len;
1.7 markus 1394: int success = 0;
1.205 djm 1395: char *prog, *cmd, *subsys = packet_get_string(&len);
1.182 djm 1396: u_int i;
1.7 markus 1397:
1.116 markus 1398: packet_check_eom();
1.155 itojun 1399: logit("subsystem request for %.100s", subsys);
1.18 jakob 1400:
1401: for (i = 0; i < options.num_subsystems; i++) {
1.105 markus 1402: if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1.205 djm 1403: prog = options.subsystem_command[i];
1404: cmd = options.subsystem_args[i];
1405: if (stat(prog, &st) < 0) {
1406: error("subsystem: cannot stat %s: %s", prog,
1.105 markus 1407: strerror(errno));
1408: break;
1409: }
1410: debug("subsystem: exec() %s", cmd);
1.64 markus 1411: s->is_subsystem = 1;
1.105 markus 1412: do_exec(s, cmd);
1.18 jakob 1413: success = 1;
1.122 markus 1414: break;
1.18 jakob 1415: }
1416: }
1417:
1418: if (!success)
1.155 itojun 1419: logit("subsystem request for %.100s failed, subsystem not found",
1.105 markus 1420: subsys);
1.7 markus 1421:
1422: xfree(subsys);
1423: return success;
1424: }
1425:
1.94 itojun 1426: static int
1.7 markus 1427: session_x11_req(Session *s)
1428: {
1.81 markus 1429: int success;
1.7 markus 1430:
1.184 djm 1431: if (s->auth_proto != NULL || s->auth_data != NULL) {
1432: error("session_x11_req: session %d: "
1.190 stevesk 1433: "x11 forwarding already active", s->self);
1.184 djm 1434: return 0;
1435: }
1.7 markus 1436: s->single_connection = packet_get_char();
1437: s->auth_proto = packet_get_string(NULL);
1438: s->auth_data = packet_get_string(NULL);
1439: s->screen = packet_get_int();
1.116 markus 1440: packet_check_eom();
1.7 markus 1441:
1.81 markus 1442: success = session_setup_x11fwd(s);
1443: if (!success) {
1.7 markus 1444: xfree(s->auth_proto);
1445: xfree(s->auth_data);
1.84 markus 1446: s->auth_proto = NULL;
1447: s->auth_data = NULL;
1.7 markus 1448: }
1.81 markus 1449: return success;
1.7 markus 1450: }
1451:
1.94 itojun 1452: static int
1.19 markus 1453: session_shell_req(Session *s)
1454: {
1.116 markus 1455: packet_check_eom();
1.90 markus 1456: do_exec(s, NULL);
1.19 markus 1457: return 1;
1458: }
1459:
1.94 itojun 1460: static int
1.19 markus 1461: session_exec_req(Session *s)
1462: {
1.45 markus 1463: u_int len;
1.19 markus 1464: char *command = packet_get_string(&len);
1.116 markus 1465: packet_check_eom();
1.90 markus 1466: do_exec(s, command);
1.92 markus 1467: xfree(command);
1.19 markus 1468: return 1;
1469: }
1470:
1.94 itojun 1471: static int
1.157 markus 1472: session_break_req(Session *s)
1473: {
1474:
1.175 deraadt 1475: packet_get_int(); /* ignored */
1.157 markus 1476: packet_check_eom();
1477:
1.160 markus 1478: if (s->ttyfd == -1 ||
1479: tcsendbreak(s->ttyfd, 0) < 0)
1.157 markus 1480: return 0;
1481: return 1;
1482: }
1483:
1484: static int
1.173 djm 1485: session_env_req(Session *s)
1486: {
1487: char *name, *val;
1488: u_int name_len, val_len, i;
1489:
1490: name = packet_get_string(&name_len);
1491: val = packet_get_string(&val_len);
1492: packet_check_eom();
1493:
1494: /* Don't set too many environment variables */
1495: if (s->num_env > 128) {
1496: debug2("Ignoring env request %s: too many env vars", name);
1497: goto fail;
1498: }
1499:
1500: for (i = 0; i < options.num_accept_env; i++) {
1501: if (match_pattern(name, options.accept_env[i])) {
1502: debug2("Setting env %d: %s=%s", s->num_env, name, val);
1.201 djm 1503: s->env = xrealloc(s->env, s->num_env + 1,
1504: sizeof(*s->env));
1.173 djm 1505: s->env[s->num_env].name = name;
1506: s->env[s->num_env].val = val;
1507: s->num_env++;
1508: return (1);
1509: }
1510: }
1511: debug2("Ignoring env request %s: disallowed name", name);
1512:
1513: fail:
1514: xfree(name);
1515: xfree(val);
1516: return (0);
1517: }
1518:
1519: static int
1.43 markus 1520: session_auth_agent_req(Session *s)
1521: {
1522: static int called = 0;
1.116 markus 1523: packet_check_eom();
1.44 markus 1524: if (no_agent_forwarding_flag) {
1525: debug("session_auth_agent_req: no_agent_forwarding_flag");
1526: return 0;
1527: }
1.43 markus 1528: if (called) {
1529: return 0;
1530: } else {
1531: called = 1;
1532: return auth_input_request_forwarding(s->pw);
1533: }
1534: }
1535:
1.123 markus 1536: int
1537: session_input_channel_req(Channel *c, const char *rtype)
1.2 markus 1538: {
1539: int success = 0;
1540: Session *s;
1541:
1.123 markus 1542: if ((s = session_by_channel(c->self)) == NULL) {
1.155 itojun 1543: logit("session_input_channel_req: no session %d req %.100s",
1.123 markus 1544: c->self, rtype);
1545: return 0;
1546: }
1547: debug("session_input_channel_req: session %d req %s", s->self, rtype);
1.2 markus 1548:
1549: /*
1.64 markus 1550: * a session is in LARVAL state until a shell, a command
1551: * or a subsystem is executed
1.2 markus 1552: */
1553: if (c->type == SSH_CHANNEL_LARVAL) {
1554: if (strcmp(rtype, "shell") == 0) {
1.19 markus 1555: success = session_shell_req(s);
1.2 markus 1556: } else if (strcmp(rtype, "exec") == 0) {
1.19 markus 1557: success = session_exec_req(s);
1.2 markus 1558: } else if (strcmp(rtype, "pty-req") == 0) {
1.221 stevesk 1559: success = session_pty_req(s);
1.7 markus 1560: } else if (strcmp(rtype, "x11-req") == 0) {
1561: success = session_x11_req(s);
1.43 markus 1562: } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1563: success = session_auth_agent_req(s);
1.7 markus 1564: } else if (strcmp(rtype, "subsystem") == 0) {
1565: success = session_subsystem_req(s);
1.173 djm 1566: } else if (strcmp(rtype, "env") == 0) {
1567: success = session_env_req(s);
1.2 markus 1568: }
1569: }
1570: if (strcmp(rtype, "window-change") == 0) {
1571: success = session_window_change_req(s);
1.177 djm 1572: } else if (strcmp(rtype, "break") == 0) {
1573: success = session_break_req(s);
1.2 markus 1574: }
1.177 djm 1575:
1.123 markus 1576: return success;
1.2 markus 1577: }
1578:
1579: void
1580: session_set_fds(Session *s, int fdin, int fdout, int fderr)
1581: {
1582: if (!compat20)
1583: fatal("session_set_fds: called for proto != 2.0");
1584: /*
1585: * now that have a child and a pipe to the child,
1586: * we can activate our channel and register the fd's
1587: */
1588: if (s->chanid == -1)
1589: fatal("no channel for session %d", s->self);
1590: channel_set_fds(s->chanid,
1591: fdout, fdin, fderr,
1.42 markus 1592: fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1.126 markus 1593: 1,
1594: CHAN_SES_WINDOW_DEFAULT);
1.2 markus 1595: }
1596:
1.85 markus 1597: /*
1598: * Function to perform pty cleanup. Also called if we get aborted abnormally
1599: * (e.g., due to a dropped connection).
1600: */
1.130 provos 1601: void
1.165 markus 1602: session_pty_cleanup2(Session *s)
1.1 markus 1603: {
1.85 markus 1604: if (s == NULL) {
1605: error("session_pty_cleanup: no session");
1606: return;
1607: }
1608: if (s->ttyfd == -1)
1.1 markus 1609: return;
1610:
1.54 stevesk 1611: debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1.1 markus 1612:
1613: /* Record that the user has logged out. */
1.85 markus 1614: if (s->pid != 0)
1615: record_logout(s->pid, s->tty);
1.1 markus 1616:
1617: /* Release the pseudo-tty. */
1.130 provos 1618: if (getuid() == 0)
1619: pty_release(s->tty);
1.1 markus 1620:
1621: /*
1622: * Close the server side of the socket pairs. We must do this after
1623: * the pty cleanup, so that another process doesn't get this pty
1624: * while we're still cleaning up.
1625: */
1626: if (close(s->ptymaster) < 0)
1.130 provos 1627: error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
1.108 markus 1628:
1629: /* unlink pty from session */
1630: s->ttyfd = -1;
1.2 markus 1631: }
1632:
1.130 provos 1633: void
1.165 markus 1634: session_pty_cleanup(Session *s)
1.130 provos 1635: {
1.165 markus 1636: PRIVSEP(session_pty_cleanup2(s));
1.130 provos 1637: }
1638:
1.147 markus 1639: static char *
1640: sig2name(int sig)
1641: {
1642: #define SSH_SIG(x) if (sig == SIG ## x) return #x
1643: SSH_SIG(ABRT);
1644: SSH_SIG(ALRM);
1645: SSH_SIG(FPE);
1646: SSH_SIG(HUP);
1647: SSH_SIG(ILL);
1648: SSH_SIG(INT);
1649: SSH_SIG(KILL);
1650: SSH_SIG(PIPE);
1651: SSH_SIG(QUIT);
1652: SSH_SIG(SEGV);
1653: SSH_SIG(TERM);
1654: SSH_SIG(USR1);
1655: SSH_SIG(USR2);
1656: #undef SSH_SIG
1657: return "SIG@openssh.com";
1658: }
1659:
1.94 itojun 1660: static void
1.184 djm 1661: session_close_x11(int id)
1662: {
1663: Channel *c;
1664:
1.189 markus 1665: if ((c = channel_by_id(id)) == NULL) {
1.184 djm 1666: debug("session_close_x11: x11 channel %d missing", id);
1667: } else {
1668: /* Detach X11 listener */
1669: debug("session_close_x11: detach x11 channel %d", id);
1670: channel_cancel_cleanup(id);
1671: if (c->ostate != CHAN_OUTPUT_CLOSED)
1672: chan_mark_dead(c);
1673: }
1674: }
1675:
1676: static void
1677: session_close_single_x11(int id, void *arg)
1678: {
1679: Session *s;
1680: u_int i;
1681:
1682: debug3("session_close_single_x11: channel %d", id);
1683: channel_cancel_cleanup(id);
1.221 stevesk 1684: if ((s = session_by_x11_channel(id)) == NULL)
1.184 djm 1685: fatal("session_close_single_x11: no x11 channel %d", id);
1686: for (i = 0; s->x11_chanids[i] != -1; i++) {
1687: debug("session_close_single_x11: session %d: "
1688: "closing channel %d", s->self, s->x11_chanids[i]);
1689: /*
1690: * The channel "id" is already closing, but make sure we
1691: * close all of its siblings.
1692: */
1693: if (s->x11_chanids[i] != id)
1694: session_close_x11(s->x11_chanids[i]);
1695: }
1696: xfree(s->x11_chanids);
1697: s->x11_chanids = NULL;
1698: if (s->display) {
1699: xfree(s->display);
1700: s->display = NULL;
1701: }
1702: if (s->auth_proto) {
1703: xfree(s->auth_proto);
1704: s->auth_proto = NULL;
1705: }
1706: if (s->auth_data) {
1707: xfree(s->auth_data);
1708: s->auth_data = NULL;
1709: }
1710: if (s->auth_display) {
1711: xfree(s->auth_display);
1712: s->auth_display = NULL;
1713: }
1714: }
1715:
1716: static void
1.2 markus 1717: session_exit_message(Session *s, int status)
1718: {
1719: Channel *c;
1.124 markus 1720:
1721: if ((c = channel_lookup(s->chanid)) == NULL)
1.85 markus 1722: fatal("session_exit_message: session %d: no channel %d",
1.2 markus 1723: s->self, s->chanid);
1.137 mpech 1724: debug("session_exit_message: session %d channel %d pid %ld",
1725: s->self, s->chanid, (long)s->pid);
1.2 markus 1726:
1727: if (WIFEXITED(status)) {
1.124 markus 1728: channel_request_start(s->chanid, "exit-status", 0);
1.2 markus 1729: packet_put_int(WEXITSTATUS(status));
1730: packet_send();
1731: } else if (WIFSIGNALED(status)) {
1.124 markus 1732: channel_request_start(s->chanid, "exit-signal", 0);
1.147 markus 1733: packet_put_cstring(sig2name(WTERMSIG(status)));
1.2 markus 1734: packet_put_char(WCOREDUMP(status));
1735: packet_put_cstring("");
1736: packet_put_cstring("");
1737: packet_send();
1738: } else {
1739: /* Some weird exit cause. Just exit. */
1740: packet_disconnect("wait returned status %04x.", status);
1741: }
1742:
1743: /* disconnect channel */
1744: debug("session_exit_message: release channel %d", s->chanid);
1.187 djm 1745:
1746: /*
1747: * Adjust cleanup callback attachment to send close messages when
1.199 deraadt 1748: * the channel gets EOF. The session will be then be closed
1.187 djm 1749: * by session_close_by_channel when the childs close their fds.
1750: */
1751: channel_register_cleanup(c->self, session_close_by_channel, 1);
1752:
1.5 markus 1753: /*
1754: * emulate a write failure with 'chan_write_failed', nobody will be
1755: * interested in data we write.
1756: * Note that we must not call 'chan_read_failed', since there could
1757: * be some more data waiting in the pipe.
1758: */
1.8 markus 1759: if (c->ostate != CHAN_OUTPUT_CLOSED)
1760: chan_write_failed(c);
1.2 markus 1761: }
1762:
1.130 provos 1763: void
1.85 markus 1764: session_close(Session *s)
1.2 markus 1765: {
1.182 djm 1766: u_int i;
1.173 djm 1767:
1.137 mpech 1768: debug("session_close: session %d pid %ld", s->self, (long)s->pid);
1.165 markus 1769: if (s->ttyfd != -1)
1.85 markus 1770: session_pty_cleanup(s);
1.2 markus 1771: if (s->term)
1772: xfree(s->term);
1773: if (s->display)
1774: xfree(s->display);
1.184 djm 1775: if (s->x11_chanids)
1776: xfree(s->x11_chanids);
1.118 stevesk 1777: if (s->auth_display)
1778: xfree(s->auth_display);
1.2 markus 1779: if (s->auth_data)
1780: xfree(s->auth_data);
1781: if (s->auth_proto)
1782: xfree(s->auth_proto);
1783: s->used = 0;
1.219 djm 1784: if (s->env != NULL) {
1785: for (i = 0; i < s->num_env; i++) {
1786: xfree(s->env[i].name);
1787: xfree(s->env[i].val);
1788: }
1789: xfree(s->env);
1.173 djm 1790: }
1.9 markus 1791: session_proctitle(s);
1.2 markus 1792: }
1793:
1794: void
1795: session_close_by_pid(pid_t pid, int status)
1796: {
1797: Session *s = session_by_pid(pid);
1798: if (s == NULL) {
1.137 mpech 1799: debug("session_close_by_pid: no session for pid %ld",
1800: (long)pid);
1.2 markus 1801: return;
1802: }
1803: if (s->chanid != -1)
1804: session_exit_message(s, status);
1.187 djm 1805: if (s->ttyfd != -1)
1806: session_pty_cleanup(s);
1.197 djm 1807: s->pid = 0;
1.98 markus 1808: }
1809:
1.2 markus 1810: /*
1811: * this is called when a channel dies before
1812: * the session 'child' itself dies
1813: */
1814: void
1815: session_close_by_channel(int id, void *arg)
1816: {
1817: Session *s = session_by_channel(id);
1.187 djm 1818: u_int i;
1.184 djm 1819:
1.2 markus 1820: if (s == NULL) {
1.107 markus 1821: debug("session_close_by_channel: no session for id %d", id);
1.2 markus 1822: return;
1823: }
1.137 mpech 1824: debug("session_close_by_channel: channel %d child %ld",
1825: id, (long)s->pid);
1.107 markus 1826: if (s->pid != 0) {
1827: debug("session_close_by_channel: channel %d: has child", id);
1.108 markus 1828: /*
1829: * delay detach of session, but release pty, since
1830: * the fd's to the child are already closed
1831: */
1.165 markus 1832: if (s->ttyfd != -1)
1.108 markus 1833: session_pty_cleanup(s);
1.107 markus 1834: return;
1835: }
1836: /* detach by removing callback */
1.2 markus 1837: channel_cancel_cleanup(s->chanid);
1.187 djm 1838:
1839: /* Close any X11 listeners associated with this session */
1840: if (s->x11_chanids != NULL) {
1841: for (i = 0; s->x11_chanids[i] != -1; i++) {
1842: session_close_x11(s->x11_chanids[i]);
1843: s->x11_chanids[i] = -1;
1844: }
1845: }
1846:
1.2 markus 1847: s->chanid = -1;
1.106 markus 1848: session_close(s);
1849: }
1850:
1851: void
1.130 provos 1852: session_destroy_all(void (*closefunc)(Session *))
1.106 markus 1853: {
1854: int i;
1.112 deraadt 1855: for (i = 0; i < MAX_SESSIONS; i++) {
1.106 markus 1856: Session *s = &sessions[i];
1.130 provos 1857: if (s->used) {
1858: if (closefunc != NULL)
1859: closefunc(s);
1860: else
1861: session_close(s);
1862: }
1.2 markus 1863: }
1.9 markus 1864: }
1865:
1.94 itojun 1866: static char *
1.9 markus 1867: session_tty_list(void)
1868: {
1869: static char buf[1024];
1870: int i;
1871: buf[0] = '\0';
1.112 deraadt 1872: for (i = 0; i < MAX_SESSIONS; i++) {
1.9 markus 1873: Session *s = &sessions[i];
1874: if (s->used && s->ttyfd != -1) {
1875: if (buf[0] != '\0')
1876: strlcat(buf, ",", sizeof buf);
1877: strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1878: }
1879: }
1880: if (buf[0] == '\0')
1881: strlcpy(buf, "notty", sizeof buf);
1882: return buf;
1883: }
1884:
1885: void
1886: session_proctitle(Session *s)
1887: {
1888: if (s->pw == NULL)
1889: error("no user for session %d", s->self);
1890: else
1891: setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1.81 markus 1892: }
1893:
1894: int
1895: session_setup_x11fwd(Session *s)
1896: {
1897: struct stat st;
1.109 stevesk 1898: char display[512], auth_display[512];
1899: char hostname[MAXHOSTNAMELEN];
1.184 djm 1900: u_int i;
1.81 markus 1901:
1902: if (no_x11_forwarding_flag) {
1903: packet_send_debug("X11 forwarding disabled in user configuration file.");
1904: return 0;
1905: }
1906: if (!options.x11_forwarding) {
1907: debug("X11 forwarding disabled in server configuration file.");
1908: return 0;
1909: }
1910: if (!options.xauth_location ||
1911: (stat(options.xauth_location, &st) == -1)) {
1912: packet_send_debug("No xauth program; cannot forward with spoofing.");
1.91 markus 1913: return 0;
1914: }
1915: if (options.use_login) {
1916: packet_send_debug("X11 forwarding disabled; "
1917: "not compatible with UseLogin=yes.");
1.81 markus 1918: return 0;
1919: }
1.87 markus 1920: if (s->display != NULL) {
1.81 markus 1921: debug("X11 display already set.");
1922: return 0;
1923: }
1.140 deraadt 1924: if (x11_create_display_inet(options.x11_display_offset,
1925: options.x11_use_localhost, s->single_connection,
1.184 djm 1926: &s->display_number, &s->x11_chanids) == -1) {
1.87 markus 1927: debug("x11_create_display_inet failed.");
1.81 markus 1928: return 0;
1.184 djm 1929: }
1930: for (i = 0; s->x11_chanids[i] != -1; i++) {
1931: channel_register_cleanup(s->x11_chanids[i],
1.187 djm 1932: session_close_single_x11, 0);
1.81 markus 1933: }
1.109 stevesk 1934:
1935: /* Set up a suitable value for the DISPLAY variable. */
1936: if (gethostname(hostname, sizeof(hostname)) < 0)
1937: fatal("gethostname: %.100s", strerror(errno));
1938: /*
1939: * auth_display must be used as the displayname when the
1940: * authorization entry is added with xauth(1). This will be
1941: * different than the DISPLAY string for localhost displays.
1942: */
1.119 stevesk 1943: if (options.x11_use_localhost) {
1.140 deraadt 1944: snprintf(display, sizeof display, "localhost:%u.%u",
1.109 stevesk 1945: s->display_number, s->screen);
1.140 deraadt 1946: snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
1.118 stevesk 1947: s->display_number, s->screen);
1.109 stevesk 1948: s->display = xstrdup(display);
1.118 stevesk 1949: s->auth_display = xstrdup(auth_display);
1.109 stevesk 1950: } else {
1.140 deraadt 1951: snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
1.109 stevesk 1952: s->display_number, s->screen);
1953: s->display = xstrdup(display);
1.118 stevesk 1954: s->auth_display = xstrdup(display);
1.109 stevesk 1955: }
1956:
1.81 markus 1957: return 1;
1.2 markus 1958: }
1959:
1.94 itojun 1960: static void
1.49 markus 1961: do_authenticated2(Authctxt *authctxt)
1.2 markus 1962: {
1.97 markus 1963: server_loop2(authctxt);
1.165 markus 1964: }
1965:
1966: void
1967: do_cleanup(Authctxt *authctxt)
1968: {
1969: static int called = 0;
1970:
1971: debug("do_cleanup");
1972:
1973: /* no cleanup if we're in the child for login shell */
1974: if (is_child)
1975: return;
1976:
1977: /* avoid double cleanup */
1978: if (called)
1979: return;
1980: called = 1;
1981:
1.218 markus 1982: if (authctxt == NULL || !authctxt->authenticated)
1.165 markus 1983: return;
1984: #ifdef KRB5
1985: if (options.kerberos_ticket_cleanup &&
1986: authctxt->krb5_ctx)
1987: krb5_cleanup_proc(authctxt);
1.161 markus 1988: #endif
1.165 markus 1989:
1990: #ifdef GSSAPI
1991: if (compat20 && options.gss_cleanup_creds)
1992: ssh_gssapi_cleanup_creds();
1993: #endif
1994:
1995: /* remove agent socket */
1996: auth_sock_cleanup_proc(authctxt->pw);
1997:
1998: /*
1999: * Cleanup ptys/utmp only if privsep is disabled,
2000: * or if running in monitor.
2001: */
2002: if (!use_privsep || mm_is_monitor())
2003: session_destroy_all(session_pty_cleanup2);
1.1 markus 2004: }
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