Annotation of src/usr.bin/ssh/session.c, Revision 1.209
1.209 ! stevesk 1: /* $OpenBSD: session.c,v 1.208 2006/07/11 18:50:48 markus 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:
36: #include "includes.h"
1.193 stevesk 37:
38: #include <sys/types.h>
39: #include <sys/wait.h>
1.194 stevesk 40: #include <sys/un.h>
1.196 stevesk 41: #include <sys/stat.h>
1.207 stevesk 42: #include <sys/socket.h>
1.192 stevesk 43:
1.209 ! stevesk 44: #include <errno.h>
1.204 stevesk 45: #include <grp.h>
1.192 stevesk 46: #include <paths.h>
1.206 stevesk 47: #include <pwd.h>
1.195 stevesk 48: #include <signal.h>
1.1 markus 49:
1.51 markus 50: #include "ssh.h"
51: #include "ssh1.h"
52: #include "ssh2.h"
1.1 markus 53: #include "xmalloc.h"
1.59 djm 54: #include "sshpty.h"
1.1 markus 55: #include "packet.h"
56: #include "buffer.h"
1.173 djm 57: #include "match.h"
1.1 markus 58: #include "uidswap.h"
59: #include "compat.h"
1.78 markus 60: #include "channels.h"
1.2 markus 61: #include "bufaux.h"
62: #include "auth.h"
1.19 markus 63: #include "auth-options.h"
1.50 markus 64: #include "pathnames.h"
1.51 markus 65: #include "log.h"
66: #include "servconf.h"
1.59 djm 67: #include "sshlogin.h"
1.51 markus 68: #include "serverloop.h"
69: #include "canohost.h"
1.55 itojun 70: #include "session.h"
1.186 markus 71: #include "kex.h"
1.130 provos 72: #include "monitor_wrap.h"
1.171 markus 73:
74: #ifdef KRB5
75: #include <kafs.h>
76: #endif
1.1 markus 77:
1.161 markus 78: #ifdef GSSAPI
79: #include "ssh-gss.h"
80: #endif
81:
1.1 markus 82: /* func */
83:
84: Session *session_new(void);
1.94 itojun 85: void session_set_fds(Session *, int, int, int);
1.165 markus 86: void session_pty_cleanup(Session *);
1.94 itojun 87: void session_proctitle(Session *);
88: int session_setup_x11fwd(Session *);
89: void do_exec_pty(Session *, const char *);
90: void do_exec_no_pty(Session *, const char *);
91: void do_exec(Session *, const char *);
92: void do_login(Session *, const char *);
93: void do_child(Session *, const char *);
1.73 djm 94: void do_motd(void);
1.94 itojun 95: int check_quietlogin(Session *, const char *);
1.1 markus 96:
1.94 itojun 97: static void do_authenticated1(Authctxt *);
98: static void do_authenticated2(Authctxt *);
99:
100: static int session_pty_req(Session *);
1.65 markus 101:
1.1 markus 102: /* import */
103: extern ServerOptions options;
104: extern char *__progname;
105: extern int log_stderr;
106: extern int debug_flag;
1.45 markus 107: extern u_int utmp_len;
1.21 markus 108: extern int startup_pipe;
1.74 markus 109: extern void destroy_sensitive_data(void);
1.179 dtucker 110: extern Buffer loginmsg;
1.21 markus 111:
1.34 markus 112: /* original command from peer. */
1.92 markus 113: const char *original_command = NULL;
1.34 markus 114:
1.1 markus 115: /* data */
116: #define MAX_SESSIONS 10
117: Session sessions[MAX_SESSIONS];
118:
1.28 millert 119: #ifdef HAVE_LOGIN_CAP
1.129 provos 120: login_cap_t *lc;
1.28 millert 121: #endif
122:
1.165 markus 123: static int is_child = 0;
124:
1.136 markus 125: /* Name and directory of socket for authentication agent forwarding. */
126: static char *auth_sock_name = NULL;
127: static char *auth_sock_dir = NULL;
128:
129: /* removes the agent forwarding socket */
130:
131: static void
1.165 markus 132: auth_sock_cleanup_proc(struct passwd *pw)
1.136 markus 133: {
134: if (auth_sock_name != NULL) {
135: temporarily_use_uid(pw);
136: unlink(auth_sock_name);
137: rmdir(auth_sock_dir);
138: auth_sock_name = NULL;
139: restore_uid();
140: }
141: }
142:
143: static int
144: auth_input_request_forwarding(struct passwd * pw)
145: {
146: Channel *nc;
147: int sock;
148: struct sockaddr_un sunaddr;
149:
150: if (auth_sock_name != NULL) {
151: error("authentication forwarding requested twice.");
152: return 0;
153: }
154:
155: /* Temporarily drop privileged uid for mkdir/bind. */
156: temporarily_use_uid(pw);
157:
158: /* Allocate a buffer for the socket name, and format the name. */
159: auth_sock_name = xmalloc(MAXPATHLEN);
160: auth_sock_dir = xmalloc(MAXPATHLEN);
1.166 markus 161: strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
1.136 markus 162:
163: /* Create private directory for socket */
164: if (mkdtemp(auth_sock_dir) == NULL) {
165: packet_send_debug("Agent forwarding disabled: "
166: "mkdtemp() failed: %.100s", strerror(errno));
167: restore_uid();
168: xfree(auth_sock_name);
169: xfree(auth_sock_dir);
170: auth_sock_name = NULL;
171: auth_sock_dir = NULL;
172: return 0;
173: }
1.137 mpech 174: snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld",
175: auth_sock_dir, (long) getpid());
1.136 markus 176:
177: /* Create the socket. */
178: sock = socket(AF_UNIX, SOCK_STREAM, 0);
179: if (sock < 0)
180: packet_disconnect("socket: %.100s", strerror(errno));
181:
182: /* Bind it to the name. */
183: memset(&sunaddr, 0, sizeof(sunaddr));
184: sunaddr.sun_family = AF_UNIX;
185: strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
186:
1.200 deraadt 187: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0)
1.136 markus 188: packet_disconnect("bind: %.100s", strerror(errno));
189:
190: /* Restore the privileged uid. */
191: restore_uid();
192:
193: /* Start listening on the socket. */
1.169 markus 194: if (listen(sock, SSH_LISTEN_BACKLOG) < 0)
1.136 markus 195: packet_disconnect("listen: %.100s", strerror(errno));
196:
197: /* Allocate a channel for the authentication agent socket. */
198: nc = channel_new("auth socket",
199: SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
200: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1.156 markus 201: 0, "auth socket", 1);
1.136 markus 202: strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
203: return 1;
204: }
205:
1.179 dtucker 206: static void
207: display_loginmsg(void)
208: {
1.183 djm 209: if (buffer_len(&loginmsg) > 0) {
210: buffer_append(&loginmsg, "\0", 1);
211: printf("%s", (char *)buffer_ptr(&loginmsg));
212: buffer_clear(&loginmsg);
213: }
1.179 dtucker 214: }
1.136 markus 215:
1.65 markus 216: void
217: do_authenticated(Authctxt *authctxt)
218: {
1.153 markus 219: setproctitle("%s", authctxt->pw->pw_name);
220:
1.65 markus 221: /* setup the channel layer */
222: if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
223: channel_permit_all_opens();
224:
225: if (compat20)
226: do_authenticated2(authctxt);
227: else
228: do_authenticated1(authctxt);
1.79 markus 229:
1.165 markus 230: do_cleanup(authctxt);
1.65 markus 231: }
232:
1.1 markus 233: /*
234: * Prepares for an interactive session. This is called after the user has
235: * been successfully authenticated. During this message exchange, pseudo
236: * terminals are allocated, X11, TCP/IP, and authentication agent forwardings
237: * are requested, etc.
238: */
1.94 itojun 239: static void
1.65 markus 240: do_authenticated1(Authctxt *authctxt)
1.1 markus 241: {
242: Session *s;
1.65 markus 243: char *command;
1.117 markus 244: int success, type, screen_flag;
1.139 deraadt 245: int enable_compression_after_reply = 0;
246: u_int proto_len, data_len, dlen, compression_level = 0;
1.1 markus 247:
1.61 markus 248: s = session_new();
1.181 markus 249: if (s == NULL) {
250: error("no more sessions");
251: return;
252: }
1.96 dugsong 253: s->authctxt = authctxt;
1.65 markus 254: s->pw = authctxt->pw;
1.28 millert 255:
1.1 markus 256: /*
257: * We stay in this loop until the client requests to execute a shell
258: * or a command.
259: */
260: for (;;) {
1.65 markus 261: success = 0;
1.1 markus 262:
263: /* Get a packet from the client. */
1.117 markus 264: type = packet_read();
1.1 markus 265:
266: /* Process the packet. */
267: switch (type) {
268: case SSH_CMSG_REQUEST_COMPRESSION:
269: compression_level = packet_get_int();
1.116 markus 270: packet_check_eom();
1.1 markus 271: if (compression_level < 1 || compression_level > 9) {
1.180 markus 272: packet_send_debug("Received invalid compression level %d.",
1.112 deraadt 273: compression_level);
1.138 markus 274: break;
275: }
1.186 markus 276: if (options.compression == COMP_NONE) {
1.138 markus 277: debug2("compression disabled");
1.1 markus 278: break;
279: }
280: /* Enable compression after we have responded with SUCCESS. */
281: enable_compression_after_reply = 1;
282: success = 1;
283: break;
284:
285: case SSH_CMSG_REQUEST_PTY:
1.86 markus 286: success = session_pty_req(s);
1.1 markus 287: break;
288:
289: case SSH_CMSG_X11_REQUEST_FORWARDING:
290: s->auth_proto = packet_get_string(&proto_len);
291: s->auth_data = packet_get_string(&data_len);
292:
1.57 markus 293: screen_flag = packet_get_protocol_flags() &
294: SSH_PROTOFLAG_SCREEN_NUMBER;
295: debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
296:
297: if (packet_remaining() == 4) {
298: if (!screen_flag)
299: debug2("Buggy client: "
300: "X11 screen flag missing");
1.1 markus 301: s->screen = packet_get_int();
1.56 markus 302: } else {
1.1 markus 303: s->screen = 0;
1.56 markus 304: }
1.116 markus 305: packet_check_eom();
1.81 markus 306: success = session_setup_x11fwd(s);
307: if (!success) {
308: xfree(s->auth_proto);
309: xfree(s->auth_data);
1.84 markus 310: s->auth_proto = NULL;
311: s->auth_data = NULL;
1.1 markus 312: }
313: break;
314:
315: case SSH_CMSG_AGENT_REQUEST_FORWARDING:
316: if (no_agent_forwarding_flag || compat13) {
317: debug("Authentication agent forwarding not permitted for this authentication.");
318: break;
319: }
320: debug("Received authentication agent forwarding request.");
1.65 markus 321: success = auth_input_request_forwarding(s->pw);
1.1 markus 322: break;
323:
324: case SSH_CMSG_PORT_FORWARD_REQUEST:
325: if (no_port_forwarding_flag) {
326: debug("Port forwarding not permitted for this authentication.");
1.39 markus 327: break;
328: }
329: if (!options.allow_tcp_forwarding) {
330: debug("Port forwarding not permitted.");
1.1 markus 331: break;
332: }
333: debug("Received TCP/IP port forwarding request.");
1.208 markus 334: if (channel_input_port_forward_request(s->pw->pw_uid == 0,
335: options.gateway_ports) < 0) {
336: debug("Port forwarding failed.");
337: break;
338: }
1.1 markus 339: success = 1;
340: break;
341:
342: case SSH_CMSG_MAX_PACKET_SIZE:
343: if (packet_set_maxsize(packet_get_int()) > 0)
344: success = 1;
345: break;
346:
347: case SSH_CMSG_EXEC_SHELL:
348: case SSH_CMSG_EXEC_CMD:
349: if (type == SSH_CMSG_EXEC_CMD) {
350: command = packet_get_string(&dlen);
351: debug("Exec command '%.500s'", command);
1.92 markus 352: do_exec(s, command);
353: xfree(command);
1.1 markus 354: } else {
1.92 markus 355: do_exec(s, NULL);
1.1 markus 356: }
1.116 markus 357: packet_check_eom();
1.82 markus 358: session_close(s);
1.1 markus 359: return;
360:
361: default:
362: /*
363: * Any unknown messages in this phase are ignored,
364: * and a failure message is returned.
365: */
1.155 itojun 366: logit("Unknown packet type received after authentication: %d", type);
1.1 markus 367: }
368: packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
369: packet_send();
370: packet_write_wait();
371:
372: /* Enable compression now that we have replied if appropriate. */
373: if (enable_compression_after_reply) {
374: enable_compression_after_reply = 0;
375: packet_start_compression(compression_level);
376: }
377: }
378: }
379:
380: /*
381: * This is called to fork and execute a command when we have no tty. This
382: * will call do_child from the child, and server_loop from the parent after
383: * setting up file descriptors and such.
384: */
1.4 markus 385: void
1.63 markus 386: do_exec_no_pty(Session *s, const char *command)
1.1 markus 387: {
1.137 mpech 388: pid_t pid;
1.1 markus 389:
390: int inout[2], err[2];
391: /* Uses socket pairs to communicate with the program. */
392: if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
393: socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
394: packet_disconnect("Could not create socket pairs: %.100s",
395: strerror(errno));
396: if (s == NULL)
397: fatal("do_exec_no_pty: no session");
398:
1.9 markus 399: session_proctitle(s);
1.1 markus 400:
401: /* Fork the child. */
402: if ((pid = fork()) == 0) {
1.165 markus 403: is_child = 1;
1.144 markus 404:
1.1 markus 405: /* Child. Reinitialize the log since the pid has changed. */
406: log_init(__progname, options.log_level, options.log_facility, log_stderr);
407:
408: /*
409: * Create a new session and process group since the 4.4BSD
410: * setlogin() affects the entire process group.
411: */
412: if (setsid() < 0)
413: error("setsid failed: %.100s", strerror(errno));
414:
415: /*
416: * Redirect stdin, stdout, and stderr. Stdin and stdout will
417: * use the same socket, as some programs (particularly rdist)
418: * seem to depend on it.
419: */
420: close(inout[1]);
421: close(err[1]);
422: if (dup2(inout[0], 0) < 0) /* stdin */
423: perror("dup2 stdin");
424: if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
425: perror("dup2 stdout");
426: if (dup2(err[0], 2) < 0) /* stderr */
427: perror("dup2 stderr");
428:
429: /* Do processing for the child (exec command etc). */
1.60 markus 430: do_child(s, command);
1.1 markus 431: /* NOTREACHED */
432: }
433: if (pid < 0)
434: packet_disconnect("fork failed: %.100s", strerror(errno));
435: s->pid = pid;
1.47 markus 436: /* Set interactive/non-interactive mode. */
1.48 markus 437: packet_set_interactive(s->display != NULL);
1.1 markus 438:
439: /* We are the parent. Close the child sides of the socket pairs. */
440: close(inout[0]);
441: close(err[0]);
442:
443: /*
444: * Enter the interactive session. Note: server_loop must be able to
445: * handle the case that fdin and fdout are the same.
446: */
1.2 markus 447: if (compat20) {
1.64 markus 448: session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
1.2 markus 449: } else {
450: server_loop(pid, inout[1], inout[1], err[1]);
451: /* server_loop has closed inout[1] and err[1]. */
452: }
1.1 markus 453: }
454:
455: /*
456: * This is called to fork and execute a command when we have a tty. This
457: * will call do_child from the child, and server_loop from the parent after
458: * setting up file descriptors, controlling tty, updating wtmp, utmp,
459: * lastlog, and other such operations.
460: */
1.4 markus 461: void
1.63 markus 462: do_exec_pty(Session *s, const char *command)
1.1 markus 463: {
464: int fdout, ptyfd, ttyfd, ptymaster;
465: pid_t pid;
466:
467: if (s == NULL)
468: fatal("do_exec_pty: no session");
469: ptyfd = s->ptyfd;
470: ttyfd = s->ttyfd;
471:
472: /* Fork the child. */
473: if ((pid = fork()) == 0) {
1.165 markus 474: is_child = 1;
1.97 markus 475:
1.24 markus 476: /* Child. Reinitialize the log because the pid has changed. */
1.1 markus 477: log_init(__progname, options.log_level, options.log_facility, log_stderr);
478: /* Close the master side of the pseudo tty. */
479: close(ptyfd);
480:
481: /* Make the pseudo tty our controlling tty. */
482: pty_make_controlling_tty(&ttyfd, s->tty);
483:
1.103 markus 484: /* Redirect stdin/stdout/stderr from the pseudo tty. */
485: if (dup2(ttyfd, 0) < 0)
486: error("dup2 stdin: %s", strerror(errno));
487: if (dup2(ttyfd, 1) < 0)
488: error("dup2 stdout: %s", strerror(errno));
489: if (dup2(ttyfd, 2) < 0)
490: error("dup2 stderr: %s", strerror(errno));
1.1 markus 491:
492: /* Close the extra descriptor for the pseudo tty. */
493: close(ttyfd);
494:
1.24 markus 495: /* record login, etc. similar to login(1) */
1.41 markus 496: if (!(options.use_login && command == NULL))
497: do_login(s, command);
1.1 markus 498:
499: /* Do common processing for the child, such as execing the command. */
1.60 markus 500: do_child(s, command);
1.1 markus 501: /* NOTREACHED */
502: }
503: if (pid < 0)
504: packet_disconnect("fork failed: %.100s", strerror(errno));
505: s->pid = pid;
506:
507: /* Parent. Close the slave side of the pseudo tty. */
508: close(ttyfd);
509:
510: /*
511: * Create another descriptor of the pty master side for use as the
512: * standard input. We could use the original descriptor, but this
513: * simplifies code in server_loop. The descriptor is bidirectional.
514: */
515: fdout = dup(ptyfd);
516: if (fdout < 0)
517: packet_disconnect("dup #1 failed: %.100s", strerror(errno));
518:
519: /* we keep a reference to the pty master */
520: ptymaster = dup(ptyfd);
521: if (ptymaster < 0)
522: packet_disconnect("dup #2 failed: %.100s", strerror(errno));
523: s->ptymaster = ptymaster;
524:
525: /* Enter interactive session. */
1.47 markus 526: packet_set_interactive(1);
1.2 markus 527: if (compat20) {
528: session_set_fds(s, ptyfd, fdout, -1);
529: } else {
530: server_loop(pid, ptyfd, fdout, -1);
531: /* server_loop _has_ closed ptyfd and fdout. */
1.24 markus 532: }
533: }
534:
1.90 markus 535: /*
536: * This is called to fork and execute a command. If another command is
537: * to be forced, execute that instead.
538: */
539: void
540: do_exec(Session *s, const char *command)
541: {
542: if (forced_command) {
543: original_command = command;
544: command = forced_command;
545: debug("Forced command '%.900s'", command);
546: }
1.163 markus 547:
548: #ifdef GSSAPI
549: if (options.gss_authentication) {
550: temporarily_use_uid(s->pw);
551: ssh_gssapi_storecreds();
552: restore_uid();
553: }
554: #endif
1.90 markus 555:
556: if (s->ttyfd != -1)
557: do_exec_pty(s, command);
558: else
559: do_exec_no_pty(s, command);
560:
1.92 markus 561: original_command = NULL;
1.179 dtucker 562:
563: /*
564: * Clear loginmsg: it's the child's responsibility to display
565: * it to the user, otherwise multiple sessions may accumulate
566: * multiple copies of the login messages.
567: */
568: buffer_clear(&loginmsg);
1.90 markus 569: }
570:
571:
1.24 markus 572: /* administrative, login(1)-like work */
573: void
1.41 markus 574: do_login(Session *s, const char *command)
1.24 markus 575: {
576: socklen_t fromlen;
577: struct sockaddr_storage from;
578: struct passwd * pw = s->pw;
579: pid_t pid = getpid();
580:
581: /*
582: * Get IP address of client. If the connection is not a socket, let
583: * the address be 0.0.0.0.
584: */
585: memset(&from, 0, sizeof(from));
1.148 stevesk 586: fromlen = sizeof(from);
1.24 markus 587: if (packet_connection_is_on_socket()) {
588: if (getpeername(packet_get_connection_in(),
1.200 deraadt 589: (struct sockaddr *)&from, &fromlen) < 0) {
1.24 markus 590: debug("getpeername: %.100s", strerror(errno));
1.165 markus 591: cleanup_exit(255);
1.24 markus 592: }
593: }
1.25 markus 594:
1.24 markus 595: /* Record that there was a login on that tty from the remote host. */
1.133 markus 596: if (!use_privsep)
597: record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
598: get_remote_name_or_ip(utmp_len,
1.158 markus 599: options.use_dns),
1.148 stevesk 600: (struct sockaddr *)&from, fromlen);
1.24 markus 601:
1.73 djm 602: if (check_quietlogin(s, command))
1.24 markus 603: return;
1.73 djm 604:
1.179 dtucker 605: display_loginmsg();
1.73 djm 606:
607: do_motd();
608: }
609:
610: /*
611: * Display the message of the day.
612: */
613: void
614: do_motd(void)
615: {
616: FILE *f;
617: char buf[256];
618:
1.24 markus 619: if (options.print_motd) {
1.28 millert 620: #ifdef HAVE_LOGIN_CAP
621: f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
622: "/etc/motd"), "r");
623: #else
1.24 markus 624: f = fopen("/etc/motd", "r");
1.28 millert 625: #endif
1.24 markus 626: if (f) {
627: while (fgets(buf, sizeof(buf), f))
628: fputs(buf, stdout);
629: fclose(f);
630: }
1.2 markus 631: }
1.73 djm 632: }
633:
634:
635: /*
636: * Check for quiet login, either .hushlogin or command given.
637: */
638: int
639: check_quietlogin(Session *s, const char *command)
640: {
641: char buf[256];
1.96 dugsong 642: struct passwd *pw = s->pw;
1.73 djm 643: struct stat st;
644:
645: /* Return 1 if .hushlogin exists or a command given. */
646: if (command != NULL)
647: return 1;
648: snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
649: #ifdef HAVE_LOGIN_CAP
650: if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
651: return 1;
652: #else
653: if (stat(buf, &st) >= 0)
654: return 1;
655: #endif
656: return 0;
1.1 markus 657: }
658:
659: /*
660: * Sets the value of the given variable in the environment. If the variable
661: * already exists, its value is overriden.
662: */
1.161 markus 663: void
1.45 markus 664: child_set_env(char ***envp, u_int *envsizep, const char *name,
1.112 deraadt 665: const char *value)
1.1 markus 666: {
1.164 markus 667: char **env;
668: u_int envsize;
1.45 markus 669: u_int i, namelen;
1.1 markus 670:
671: /*
672: * Find the slot where the value should be stored. If the variable
673: * already exists, we reuse the slot; otherwise we append a new slot
674: * at the end of the array, expanding if necessary.
675: */
676: env = *envp;
677: namelen = strlen(name);
678: for (i = 0; env[i]; i++)
679: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
680: break;
681: if (env[i]) {
682: /* Reuse the slot. */
683: xfree(env[i]);
684: } else {
685: /* New variable. Expand if necessary. */
1.164 markus 686: envsize = *envsizep;
687: if (i >= envsize - 1) {
688: if (envsize >= 1000)
689: fatal("child_set_env: too many env vars");
690: envsize += 50;
1.201 djm 691: env = (*envp) = xrealloc(env, envsize, sizeof(char *));
1.164 markus 692: *envsizep = envsize;
1.1 markus 693: }
694: /* Need to set the NULL pointer at end of array beyond the new slot. */
695: env[i + 1] = NULL;
696: }
697:
698: /* Allocate space and format the variable in the appropriate slot. */
699: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
700: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
701: }
702:
703: /*
704: * Reads environment variables from the given file and adds/overrides them
705: * into the environment. If the file does not exist, this does nothing.
706: * Otherwise, it must consist of empty lines, comments (line starts with '#')
707: * and assignments of the form name=value. No other forms are allowed.
708: */
1.94 itojun 709: static void
1.45 markus 710: read_environment_file(char ***env, u_int *envsize,
1.112 deraadt 711: const char *filename)
1.1 markus 712: {
713: FILE *f;
714: char buf[4096];
715: char *cp, *value;
1.142 deraadt 716: u_int lineno = 0;
1.1 markus 717:
718: f = fopen(filename, "r");
719: if (!f)
720: return;
721:
722: while (fgets(buf, sizeof(buf), f)) {
1.142 deraadt 723: if (++lineno > 1000)
724: fatal("Too many lines in environment file %s", filename);
1.1 markus 725: for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
726: ;
727: if (!*cp || *cp == '#' || *cp == '\n')
728: continue;
729: if (strchr(cp, '\n'))
730: *strchr(cp, '\n') = '\0';
731: value = strchr(cp, '=');
732: if (value == NULL) {
1.142 deraadt 733: fprintf(stderr, "Bad line %u in %.100s\n", lineno,
734: filename);
1.1 markus 735: continue;
736: }
1.14 deraadt 737: /*
738: * Replace the equals sign by nul, and advance value to
739: * the value string.
740: */
1.1 markus 741: *value = '\0';
742: value++;
743: child_set_env(env, envsize, cp, value);
744: }
745: fclose(f);
746: }
747:
1.127 markus 748: static char **
749: do_setup_env(Session *s, const char *shell)
1.1 markus 750: {
751: char buf[256];
1.127 markus 752: u_int i, envsize;
1.154 markus 753: char **env, *laddr;
1.127 markus 754: struct passwd *pw = s->pw;
1.1 markus 755:
756: /* Initialize the environment. */
757: envsize = 100;
758: env = xmalloc(envsize * sizeof(char *));
759: env[0] = NULL;
760:
1.161 markus 761: #ifdef GSSAPI
1.168 djm 762: /* Allow any GSSAPI methods that we've used to alter
1.161 markus 763: * the childs environment as they see fit
764: */
765: ssh_gssapi_do_child(&env, &envsize);
766: #endif
767:
1.1 markus 768: if (!options.use_login) {
769: /* Set basic environment. */
1.173 djm 770: for (i = 0; i < s->num_env; i++)
1.178 deraadt 771: child_set_env(&env, &envsize, s->env[i].name,
1.173 djm 772: s->env[i].val);
773:
1.1 markus 774: child_set_env(&env, &envsize, "USER", pw->pw_name);
775: child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
776: child_set_env(&env, &envsize, "HOME", pw->pw_dir);
1.28 millert 777: #ifdef HAVE_LOGIN_CAP
1.145 markus 778: if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
779: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
780: else
781: child_set_env(&env, &envsize, "PATH", getenv("PATH"));
1.28 millert 782: #else
1.29 millert 783: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
1.28 millert 784: #endif
1.1 markus 785:
786: snprintf(buf, sizeof buf, "%.200s/%.50s",
787: _PATH_MAILDIR, pw->pw_name);
788: child_set_env(&env, &envsize, "MAIL", buf);
789:
790: /* Normal systems set SHELL by default. */
791: child_set_env(&env, &envsize, "SHELL", shell);
792: }
793: if (getenv("TZ"))
794: child_set_env(&env, &envsize, "TZ", getenv("TZ"));
795:
796: /* Set custom environment options from RSA authentication. */
1.110 markus 797: if (!options.use_login) {
798: while (custom_environment) {
799: struct envstring *ce = custom_environment;
1.143 deraadt 800: char *str = ce->s;
1.127 markus 801:
1.143 deraadt 802: for (i = 0; str[i] != '=' && str[i]; i++)
1.110 markus 803: ;
1.143 deraadt 804: if (str[i] == '=') {
805: str[i] = 0;
806: child_set_env(&env, &envsize, str, str + i + 1);
1.110 markus 807: }
808: custom_environment = ce->next;
809: xfree(ce->s);
810: xfree(ce);
1.1 markus 811: }
812: }
813:
1.149 stevesk 814: /* SSH_CLIENT deprecated */
1.1 markus 815: snprintf(buf, sizeof buf, "%.50s %d %d",
1.127 markus 816: get_remote_ipaddr(), get_remote_port(), get_local_port());
1.1 markus 817: child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1.149 stevesk 818:
1.154 markus 819: laddr = get_local_ipaddr(packet_get_connection_in());
1.149 stevesk 820: snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1.154 markus 821: get_remote_ipaddr(), get_remote_port(), laddr, get_local_port());
822: xfree(laddr);
1.149 stevesk 823: child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1.1 markus 824:
1.60 markus 825: if (s->ttyfd != -1)
826: child_set_env(&env, &envsize, "SSH_TTY", s->tty);
827: if (s->term)
828: child_set_env(&env, &envsize, "TERM", s->term);
829: if (s->display)
830: child_set_env(&env, &envsize, "DISPLAY", s->display);
1.34 markus 831: if (original_command)
832: child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
833: original_command);
1.96 dugsong 834: #ifdef KRB5
835: if (s->authctxt->krb5_ticket_file)
836: child_set_env(&env, &envsize, "KRB5CCNAME",
1.112 deraadt 837: s->authctxt->krb5_ticket_file);
1.96 dugsong 838: #endif
1.136 markus 839: if (auth_sock_name != NULL)
1.1 markus 840: child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
1.136 markus 841: auth_sock_name);
1.1 markus 842:
843: /* read $HOME/.ssh/environment. */
1.146 markus 844: if (options.permit_user_env && !options.use_login) {
1.14 deraadt 845: snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
846: pw->pw_dir);
1.1 markus 847: read_environment_file(&env, &envsize, buf);
848: }
849: if (debug_flag) {
850: /* dump the environment */
851: fprintf(stderr, "Environment:\n");
852: for (i = 0; env[i]; i++)
853: fprintf(stderr, " %.200s\n", env[i]);
854: }
1.127 markus 855: return env;
856: }
857:
858: /*
859: * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
860: * first in this order).
861: */
862: static void
863: do_rc_files(Session *s, const char *shell)
864: {
865: FILE *f = NULL;
866: char cmd[1024];
867: int do_xauth;
868: struct stat st;
869:
870: do_xauth =
871: s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
872:
873: /* ignore _PATH_SSH_USER_RC for subsystems */
874: if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
875: snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
876: shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
877: if (debug_flag)
878: fprintf(stderr, "Running %s\n", cmd);
879: f = popen(cmd, "w");
880: if (f) {
881: if (do_xauth)
882: fprintf(f, "%s %s\n", s->auth_proto,
883: s->auth_data);
884: pclose(f);
885: } else
886: fprintf(stderr, "Could not run %s\n",
887: _PATH_SSH_USER_RC);
888: } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
889: if (debug_flag)
890: fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
891: _PATH_SSH_SYSTEM_RC);
892: f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
893: if (f) {
894: if (do_xauth)
895: fprintf(f, "%s %s\n", s->auth_proto,
896: s->auth_data);
897: pclose(f);
898: } else
899: fprintf(stderr, "Could not run %s\n",
900: _PATH_SSH_SYSTEM_RC);
901: } else if (do_xauth && options.xauth_location != NULL) {
902: /* Add authority data to .Xauthority if appropriate. */
903: if (debug_flag) {
904: fprintf(stderr,
1.151 stevesk 905: "Running %.500s remove %.100s\n",
1.165 markus 906: options.xauth_location, s->auth_display);
1.151 stevesk 907: fprintf(stderr,
908: "%.500s add %.100s %.100s %.100s\n",
1.127 markus 909: options.xauth_location, s->auth_display,
910: s->auth_proto, s->auth_data);
911: }
912: snprintf(cmd, sizeof cmd, "%s -q -",
913: options.xauth_location);
914: f = popen(cmd, "w");
915: if (f) {
1.151 stevesk 916: fprintf(f, "remove %s\n",
917: s->auth_display);
1.127 markus 918: fprintf(f, "add %s %s %s\n",
919: s->auth_display, s->auth_proto,
920: s->auth_data);
921: pclose(f);
922: } else {
923: fprintf(stderr, "Could not run %s\n",
924: cmd);
925: }
926: }
927: }
928:
929: static void
930: do_nologin(struct passwd *pw)
931: {
932: FILE *f = NULL;
933: char buf[1024];
934:
935: #ifdef HAVE_LOGIN_CAP
936: if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
937: f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
938: _PATH_NOLOGIN), "r");
939: #else
940: if (pw->pw_uid)
941: f = fopen(_PATH_NOLOGIN, "r");
942: #endif
943: if (f) {
944: /* /etc/nologin exists. Print its contents and exit. */
1.155 itojun 945: logit("User %.100s not allowed because %s exists",
1.150 stevesk 946: pw->pw_name, _PATH_NOLOGIN);
1.127 markus 947: while (fgets(buf, sizeof(buf), f))
948: fputs(buf, stderr);
949: fclose(f);
950: exit(254);
951: }
952: }
953:
954: /* Set login name, uid, gid, and groups. */
1.130 provos 955: void
1.127 markus 956: do_setusercontext(struct passwd *pw)
957: {
958: if (getuid() == 0 || geteuid() == 0) {
959: #ifdef HAVE_LOGIN_CAP
960: if (setusercontext(lc, pw, pw->pw_uid,
961: (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
962: perror("unable to set user context");
963: exit(1);
964: }
965: #else
966: if (setlogin(pw->pw_name) < 0)
967: error("setlogin failed: %s", strerror(errno));
968: if (setgid(pw->pw_gid) < 0) {
969: perror("setgid");
970: exit(1);
971: }
972: /* Initialize the group list. */
973: if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
974: perror("initgroups");
975: exit(1);
976: }
977: endgrent();
978:
979: /* Permanently switch to the desired uid. */
980: permanently_set_uid(pw);
981: #endif
982: }
983: if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
984: fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
985: }
986:
1.131 markus 987: static void
1.172 markus 988: do_pwchange(Session *s)
989: {
1.179 dtucker 990: fflush(NULL);
1.172 markus 991: fprintf(stderr, "WARNING: Your password has expired.\n");
992: if (s->ttyfd != -1) {
1.178 deraadt 993: fprintf(stderr,
1.172 markus 994: "You must change your password now and login again!\n");
995: execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
996: perror("passwd");
997: } else {
998: fprintf(stderr,
999: "Password change required but no TTY available.\n");
1000: }
1001: exit(1);
1002: }
1003:
1004: static void
1.130 provos 1005: launch_login(struct passwd *pw, const char *hostname)
1006: {
1007: /* Launch login(1). */
1008:
1009: execl("/usr/bin/login", "login", "-h", hostname,
1010: "-p", "-f", "--", pw->pw_name, (char *)NULL);
1011:
1012: /* Login couldn't be executed, die. */
1013:
1014: perror("login");
1015: exit(1);
1016: }
1017:
1.172 markus 1018: static void
1019: child_close_fds(void)
1020: {
1021: int i;
1022:
1023: if (packet_get_connection_in() == packet_get_connection_out())
1024: close(packet_get_connection_in());
1025: else {
1026: close(packet_get_connection_in());
1027: close(packet_get_connection_out());
1028: }
1029: /*
1030: * Close all descriptors related to channels. They will still remain
1031: * open in the parent.
1032: */
1033: /* XXX better use close-on-exec? -markus */
1034: channel_close_all();
1035:
1036: /*
1037: * Close any extra file descriptors. Note that there may still be
1038: * descriptors left by system functions. They will be closed later.
1039: */
1040: endpwent();
1041:
1042: /*
1.188 djm 1043: * Close any extra open file descriptors so that we don't have them
1.172 markus 1044: * hanging around in clients. Note that we want to do this after
1045: * initgroups, because at least on Solaris 2.3 it leaves file
1046: * descriptors open.
1047: */
1048: for (i = 3; i < 64; i++)
1049: close(i);
1050: }
1051:
1.127 markus 1052: /*
1053: * Performs common processing for the child, such as setting up the
1054: * environment, closing extra file descriptors, setting the user and group
1055: * ids, and executing the command or shell.
1056: */
1057: void
1058: do_child(Session *s, const char *command)
1059: {
1060: extern char **environ;
1061: char **env;
1062: char *argv[10];
1063: const char *shell, *shell0, *hostname = NULL;
1064: struct passwd *pw = s->pw;
1065:
1066: /* remove hostkey from the child's memory */
1067: destroy_sensitive_data();
1068:
1.172 markus 1069: /* Force a password change */
1070: if (s->authctxt->force_pwchange) {
1071: do_setusercontext(pw);
1072: child_close_fds();
1073: do_pwchange(s);
1074: exit(1);
1075: }
1076:
1.127 markus 1077: /* login(1) is only called if we execute the login shell */
1078: if (options.use_login && command != NULL)
1079: options.use_login = 0;
1080:
1081: /*
1082: * Login(1) does this as well, and it needs uid 0 for the "-h"
1083: * switch, so we let login(1) to this for us.
1084: */
1085: if (!options.use_login) {
1086: do_nologin(pw);
1087: do_setusercontext(pw);
1088: }
1089:
1090: /*
1091: * Get the shell from the password data. An empty shell field is
1092: * legal, and means /bin/sh.
1093: */
1094: shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1.152 markus 1095:
1096: /*
1097: * Make sure $SHELL points to the shell from the password file,
1098: * even if shell is overridden from login.conf
1099: */
1100: env = do_setup_env(s, shell);
1101:
1.127 markus 1102: #ifdef HAVE_LOGIN_CAP
1103: shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1104: #endif
1105:
1.26 millert 1106: /* we have to stash the hostname before we close our socket. */
1107: if (options.use_login)
1.70 stevesk 1108: hostname = get_remote_name_or_ip(utmp_len,
1.158 markus 1109: options.use_dns);
1.1 markus 1110: /*
1111: * Close the connection descriptors; note that this is the child, and
1112: * the server will still have the socket open, and it is important
1113: * that we do not shutdown it. Note that the descriptors cannot be
1114: * closed before building the environment, as we call
1115: * get_remote_ipaddr there.
1116: */
1.172 markus 1117: child_close_fds();
1.1 markus 1118:
1119: /*
1.125 deraadt 1120: * Must take new environment into use so that .ssh/rc,
1121: * /etc/ssh/sshrc and xauth are run in the proper environment.
1.1 markus 1122: */
1123: environ = env;
1.170 jakob 1124:
1125: #ifdef KRB5
1126: /*
1127: * At this point, we check to see if AFS is active and if we have
1128: * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1129: * if we can (and need to) extend the ticket into an AFS token. If
1130: * we don't do this, we run into potential problems if the user's
1131: * home directory is in AFS and it's not world-readable.
1132: */
1133:
1134: if (options.kerberos_get_afs_token && k_hasafs() &&
1.185 djm 1135: (s->authctxt->krb5_ctx != NULL)) {
1.170 jakob 1136: char cell[64];
1137:
1138: debug("Getting AFS token");
1139:
1140: k_setpag();
1141:
1142: if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1143: krb5_afslog(s->authctxt->krb5_ctx,
1144: s->authctxt->krb5_fwd_ccache, cell, NULL);
1145:
1146: krb5_afslog_home(s->authctxt->krb5_ctx,
1147: s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1148: }
1149: #endif
1.104 markus 1150:
1.188 djm 1151: /* Change current directory to the user's home directory. */
1.104 markus 1152: if (chdir(pw->pw_dir) < 0) {
1153: fprintf(stderr, "Could not chdir to home directory %s: %s\n",
1154: pw->pw_dir, strerror(errno));
1155: #ifdef HAVE_LOGIN_CAP
1156: if (login_getcapbool(lc, "requirehome", 0))
1157: exit(1);
1158: #endif
1159: }
1.1 markus 1160:
1.127 markus 1161: if (!options.use_login)
1162: do_rc_files(s, shell);
1.67 markus 1163:
1164: /* restore SIGPIPE for child */
1165: signal(SIGPIPE, SIG_DFL);
1166:
1.127 markus 1167: if (options.use_login) {
1.130 provos 1168: launch_login(pw, hostname);
1169: /* NEVERREACHED */
1.127 markus 1170: }
1171:
1172: /* Get the last component of the shell name. */
1173: if ((shell0 = strrchr(shell, '/')) != NULL)
1174: shell0++;
1175: else
1176: shell0 = shell;
1177:
1.1 markus 1178: /*
1179: * If we have no command, execute the shell. In this case, the shell
1180: * name to be passed in argv[0] is preceded by '-' to indicate that
1181: * this is a login shell.
1182: */
1183: if (!command) {
1.127 markus 1184: char argv0[256];
1.1 markus 1185:
1.127 markus 1186: /* Start the shell. Set initial character to '-'. */
1187: argv0[0] = '-';
1.1 markus 1188:
1.127 markus 1189: if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1.128 markus 1190: >= sizeof(argv0) - 1) {
1.127 markus 1191: errno = EINVAL;
1.1 markus 1192: perror(shell);
1193: exit(1);
1.127 markus 1194: }
1.1 markus 1195:
1.127 markus 1196: /* Execute the shell. */
1197: argv[0] = argv0;
1198: argv[1] = NULL;
1199: execve(shell, argv, env);
1200:
1201: /* Executing the shell failed. */
1202: perror(shell);
1203: exit(1);
1.1 markus 1204: }
1205: /*
1206: * Execute the command using the user's shell. This uses the -c
1207: * option to execute the command.
1208: */
1.127 markus 1209: argv[0] = (char *) shell0;
1.1 markus 1210: argv[1] = "-c";
1211: argv[2] = (char *) command;
1212: argv[3] = NULL;
1213: execve(shell, argv, env);
1214: perror(shell);
1215: exit(1);
1216: }
1217:
1218: Session *
1219: session_new(void)
1220: {
1221: int i;
1222: static int did_init = 0;
1223: if (!did_init) {
1224: debug("session_new: init");
1.112 deraadt 1225: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1226: sessions[i].used = 0;
1227: }
1228: did_init = 1;
1229: }
1.112 deraadt 1230: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1231: Session *s = &sessions[i];
1232: if (! s->used) {
1.68 djm 1233: memset(s, 0, sizeof(*s));
1.1 markus 1234: s->chanid = -1;
1235: s->ptyfd = -1;
1236: s->ttyfd = -1;
1237: s->used = 1;
1.85 markus 1238: s->self = i;
1.184 djm 1239: s->x11_chanids = NULL;
1.1 markus 1240: debug("session_new: session %d", i);
1241: return s;
1242: }
1243: }
1244: return NULL;
1245: }
1246:
1.94 itojun 1247: static void
1.1 markus 1248: session_dump(void)
1249: {
1250: int i;
1.112 deraadt 1251: for (i = 0; i < MAX_SESSIONS; i++) {
1.1 markus 1252: Session *s = &sessions[i];
1.137 mpech 1253: debug("dump: used %d session %d %p channel %d pid %ld",
1.1 markus 1254: s->used,
1255: s->self,
1256: s,
1257: s->chanid,
1.137 mpech 1258: (long)s->pid);
1.1 markus 1259: }
1260: }
1261:
1.2 markus 1262: int
1.97 markus 1263: session_open(Authctxt *authctxt, int chanid)
1.2 markus 1264: {
1265: Session *s = session_new();
1266: debug("session_open: channel %d", chanid);
1267: if (s == NULL) {
1268: error("no more sessions");
1269: return 0;
1270: }
1.97 markus 1271: s->authctxt = authctxt;
1272: s->pw = authctxt->pw;
1.167 djm 1273: if (s->pw == NULL || !authctxt->valid)
1.54 stevesk 1274: fatal("no user for session %d", s->self);
1.2 markus 1275: debug("session_open: session %d: link with channel %d", s->self, chanid);
1276: s->chanid = chanid;
1277: return 1;
1278: }
1279:
1.130 provos 1280: Session *
1281: session_by_tty(char *tty)
1282: {
1283: int i;
1284: for (i = 0; i < MAX_SESSIONS; i++) {
1285: Session *s = &sessions[i];
1286: if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1287: debug("session_by_tty: session %d tty %s", i, tty);
1288: return s;
1289: }
1290: }
1291: debug("session_by_tty: unknown tty %.100s", tty);
1292: session_dump();
1293: return NULL;
1294: }
1295:
1.94 itojun 1296: static Session *
1.2 markus 1297: session_by_channel(int id)
1298: {
1299: int i;
1.112 deraadt 1300: for (i = 0; i < MAX_SESSIONS; i++) {
1.2 markus 1301: Session *s = &sessions[i];
1302: if (s->used && s->chanid == id) {
1303: debug("session_by_channel: session %d channel %d", i, id);
1304: return s;
1305: }
1306: }
1307: debug("session_by_channel: unknown channel %d", id);
1308: session_dump();
1309: return NULL;
1310: }
1311:
1.94 itojun 1312: static Session *
1.184 djm 1313: session_by_x11_channel(int id)
1314: {
1315: int i, j;
1316:
1317: for (i = 0; i < MAX_SESSIONS; i++) {
1318: Session *s = &sessions[i];
1319:
1320: if (s->x11_chanids == NULL || !s->used)
1321: continue;
1322: for (j = 0; s->x11_chanids[j] != -1; j++) {
1323: if (s->x11_chanids[j] == id) {
1324: debug("session_by_x11_channel: session %d "
1325: "channel %d", s->self, id);
1326: return s;
1327: }
1328: }
1329: }
1330: debug("session_by_x11_channel: unknown channel %d", id);
1331: session_dump();
1332: return NULL;
1333: }
1334:
1335: static Session *
1.2 markus 1336: session_by_pid(pid_t pid)
1337: {
1338: int i;
1.137 mpech 1339: debug("session_by_pid: pid %ld", (long)pid);
1.112 deraadt 1340: for (i = 0; i < MAX_SESSIONS; i++) {
1.2 markus 1341: Session *s = &sessions[i];
1342: if (s->used && s->pid == pid)
1343: return s;
1344: }
1.137 mpech 1345: error("session_by_pid: unknown pid %ld", (long)pid);
1.2 markus 1346: session_dump();
1347: return NULL;
1348: }
1349:
1.94 itojun 1350: static int
1.2 markus 1351: session_window_change_req(Session *s)
1352: {
1353: s->col = packet_get_int();
1354: s->row = packet_get_int();
1355: s->xpixel = packet_get_int();
1356: s->ypixel = packet_get_int();
1.116 markus 1357: packet_check_eom();
1.2 markus 1358: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1359: return 1;
1360: }
1361:
1.94 itojun 1362: static int
1.2 markus 1363: session_pty_req(Session *s)
1364: {
1.45 markus 1365: u_int len;
1.72 stevesk 1366: int n_bytes;
1.132 markus 1367:
1.86 markus 1368: if (no_pty_flag) {
1369: debug("Allocating a pty not permitted for this authentication.");
1.19 markus 1370: return 0;
1.86 markus 1371: }
1372: if (s->ttyfd != -1) {
1373: packet_disconnect("Protocol error: you already have a pty.");
1.3 markus 1374: return 0;
1.86 markus 1375: }
1376:
1.2 markus 1377: s->term = packet_get_string(&len);
1.86 markus 1378:
1379: if (compat20) {
1380: s->col = packet_get_int();
1381: s->row = packet_get_int();
1382: } else {
1383: s->row = packet_get_int();
1384: s->col = packet_get_int();
1385: }
1.2 markus 1386: s->xpixel = packet_get_int();
1387: s->ypixel = packet_get_int();
1388:
1389: if (strcmp(s->term, "") == 0) {
1390: xfree(s->term);
1391: s->term = NULL;
1392: }
1.86 markus 1393:
1.2 markus 1394: /* Allocate a pty and open it. */
1.86 markus 1395: debug("Allocating pty.");
1.130 provos 1396: if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
1.86 markus 1397: if (s->term)
1398: xfree(s->term);
1.2 markus 1399: s->term = NULL;
1400: s->ptyfd = -1;
1401: s->ttyfd = -1;
1402: error("session_pty_req: session %d alloc failed", s->self);
1.3 markus 1403: return 0;
1.2 markus 1404: }
1405: debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1.86 markus 1406:
1407: /* for SSH1 the tty modes length is not given */
1408: if (!compat20)
1409: n_bytes = packet_remaining();
1410: tty_parse_modes(s->ttyfd, &n_bytes);
1411:
1.130 provos 1412: if (!use_privsep)
1413: pty_setowner(s->pw, s->tty);
1.86 markus 1414:
1415: /* Set window size from the packet. */
1.2 markus 1416: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1417:
1.116 markus 1418: packet_check_eom();
1.9 markus 1419: session_proctitle(s);
1.2 markus 1420: return 1;
1421: }
1422:
1.94 itojun 1423: static int
1.7 markus 1424: session_subsystem_req(Session *s)
1425: {
1.105 markus 1426: struct stat st;
1.45 markus 1427: u_int len;
1.7 markus 1428: int success = 0;
1.205 djm 1429: char *prog, *cmd, *subsys = packet_get_string(&len);
1.182 djm 1430: u_int i;
1.7 markus 1431:
1.116 markus 1432: packet_check_eom();
1.155 itojun 1433: logit("subsystem request for %.100s", subsys);
1.18 jakob 1434:
1435: for (i = 0; i < options.num_subsystems; i++) {
1.105 markus 1436: if (strcmp(subsys, options.subsystem_name[i]) == 0) {
1.205 djm 1437: prog = options.subsystem_command[i];
1438: cmd = options.subsystem_args[i];
1439: if (stat(prog, &st) < 0) {
1440: error("subsystem: cannot stat %s: %s", prog,
1.105 markus 1441: strerror(errno));
1442: break;
1443: }
1444: debug("subsystem: exec() %s", cmd);
1.64 markus 1445: s->is_subsystem = 1;
1.105 markus 1446: do_exec(s, cmd);
1.18 jakob 1447: success = 1;
1.122 markus 1448: break;
1.18 jakob 1449: }
1450: }
1451:
1452: if (!success)
1.155 itojun 1453: logit("subsystem request for %.100s failed, subsystem not found",
1.105 markus 1454: subsys);
1.7 markus 1455:
1456: xfree(subsys);
1457: return success;
1458: }
1459:
1.94 itojun 1460: static int
1.7 markus 1461: session_x11_req(Session *s)
1462: {
1.81 markus 1463: int success;
1.7 markus 1464:
1.184 djm 1465: if (s->auth_proto != NULL || s->auth_data != NULL) {
1466: error("session_x11_req: session %d: "
1.190 stevesk 1467: "x11 forwarding already active", s->self);
1.184 djm 1468: return 0;
1469: }
1.7 markus 1470: s->single_connection = packet_get_char();
1471: s->auth_proto = packet_get_string(NULL);
1472: s->auth_data = packet_get_string(NULL);
1473: s->screen = packet_get_int();
1.116 markus 1474: packet_check_eom();
1.7 markus 1475:
1.81 markus 1476: success = session_setup_x11fwd(s);
1477: if (!success) {
1.7 markus 1478: xfree(s->auth_proto);
1479: xfree(s->auth_data);
1.84 markus 1480: s->auth_proto = NULL;
1481: s->auth_data = NULL;
1.7 markus 1482: }
1.81 markus 1483: return success;
1.7 markus 1484: }
1485:
1.94 itojun 1486: static int
1.19 markus 1487: session_shell_req(Session *s)
1488: {
1.116 markus 1489: packet_check_eom();
1.90 markus 1490: do_exec(s, NULL);
1.19 markus 1491: return 1;
1492: }
1493:
1.94 itojun 1494: static int
1.19 markus 1495: session_exec_req(Session *s)
1496: {
1.45 markus 1497: u_int len;
1.19 markus 1498: char *command = packet_get_string(&len);
1.116 markus 1499: packet_check_eom();
1.90 markus 1500: do_exec(s, command);
1.92 markus 1501: xfree(command);
1.19 markus 1502: return 1;
1503: }
1504:
1.94 itojun 1505: static int
1.157 markus 1506: session_break_req(Session *s)
1507: {
1508:
1.175 deraadt 1509: packet_get_int(); /* ignored */
1.157 markus 1510: packet_check_eom();
1511:
1.160 markus 1512: if (s->ttyfd == -1 ||
1513: tcsendbreak(s->ttyfd, 0) < 0)
1.157 markus 1514: return 0;
1515: return 1;
1516: }
1517:
1518: static int
1.173 djm 1519: session_env_req(Session *s)
1520: {
1521: char *name, *val;
1522: u_int name_len, val_len, i;
1523:
1524: name = packet_get_string(&name_len);
1525: val = packet_get_string(&val_len);
1526: packet_check_eom();
1527:
1528: /* Don't set too many environment variables */
1529: if (s->num_env > 128) {
1530: debug2("Ignoring env request %s: too many env vars", name);
1531: goto fail;
1532: }
1533:
1534: for (i = 0; i < options.num_accept_env; i++) {
1535: if (match_pattern(name, options.accept_env[i])) {
1536: debug2("Setting env %d: %s=%s", s->num_env, name, val);
1.201 djm 1537: s->env = xrealloc(s->env, s->num_env + 1,
1538: sizeof(*s->env));
1.173 djm 1539: s->env[s->num_env].name = name;
1540: s->env[s->num_env].val = val;
1541: s->num_env++;
1542: return (1);
1543: }
1544: }
1545: debug2("Ignoring env request %s: disallowed name", name);
1546:
1547: fail:
1548: xfree(name);
1549: xfree(val);
1550: return (0);
1551: }
1552:
1553: static int
1.43 markus 1554: session_auth_agent_req(Session *s)
1555: {
1556: static int called = 0;
1.116 markus 1557: packet_check_eom();
1.44 markus 1558: if (no_agent_forwarding_flag) {
1559: debug("session_auth_agent_req: no_agent_forwarding_flag");
1560: return 0;
1561: }
1.43 markus 1562: if (called) {
1563: return 0;
1564: } else {
1565: called = 1;
1566: return auth_input_request_forwarding(s->pw);
1567: }
1568: }
1569:
1.123 markus 1570: int
1571: session_input_channel_req(Channel *c, const char *rtype)
1.2 markus 1572: {
1573: int success = 0;
1574: Session *s;
1575:
1.123 markus 1576: if ((s = session_by_channel(c->self)) == NULL) {
1.155 itojun 1577: logit("session_input_channel_req: no session %d req %.100s",
1.123 markus 1578: c->self, rtype);
1579: return 0;
1580: }
1581: debug("session_input_channel_req: session %d req %s", s->self, rtype);
1.2 markus 1582:
1583: /*
1.64 markus 1584: * a session is in LARVAL state until a shell, a command
1585: * or a subsystem is executed
1.2 markus 1586: */
1587: if (c->type == SSH_CHANNEL_LARVAL) {
1588: if (strcmp(rtype, "shell") == 0) {
1.19 markus 1589: success = session_shell_req(s);
1.2 markus 1590: } else if (strcmp(rtype, "exec") == 0) {
1.19 markus 1591: success = session_exec_req(s);
1.2 markus 1592: } else if (strcmp(rtype, "pty-req") == 0) {
1.3 markus 1593: success = session_pty_req(s);
1.7 markus 1594: } else if (strcmp(rtype, "x11-req") == 0) {
1595: success = session_x11_req(s);
1.43 markus 1596: } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1597: success = session_auth_agent_req(s);
1.7 markus 1598: } else if (strcmp(rtype, "subsystem") == 0) {
1599: success = session_subsystem_req(s);
1.173 djm 1600: } else if (strcmp(rtype, "env") == 0) {
1601: success = session_env_req(s);
1.2 markus 1602: }
1603: }
1604: if (strcmp(rtype, "window-change") == 0) {
1605: success = session_window_change_req(s);
1.177 djm 1606: } else if (strcmp(rtype, "break") == 0) {
1607: success = session_break_req(s);
1.2 markus 1608: }
1.177 djm 1609:
1.123 markus 1610: return success;
1.2 markus 1611: }
1612:
1613: void
1614: session_set_fds(Session *s, int fdin, int fdout, int fderr)
1615: {
1616: if (!compat20)
1617: fatal("session_set_fds: called for proto != 2.0");
1618: /*
1619: * now that have a child and a pipe to the child,
1620: * we can activate our channel and register the fd's
1621: */
1622: if (s->chanid == -1)
1623: fatal("no channel for session %d", s->self);
1624: channel_set_fds(s->chanid,
1625: fdout, fdin, fderr,
1.42 markus 1626: fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1.126 markus 1627: 1,
1628: CHAN_SES_WINDOW_DEFAULT);
1.2 markus 1629: }
1630:
1.85 markus 1631: /*
1632: * Function to perform pty cleanup. Also called if we get aborted abnormally
1633: * (e.g., due to a dropped connection).
1634: */
1.130 provos 1635: void
1.165 markus 1636: session_pty_cleanup2(Session *s)
1.1 markus 1637: {
1.85 markus 1638: if (s == NULL) {
1639: error("session_pty_cleanup: no session");
1640: return;
1641: }
1642: if (s->ttyfd == -1)
1.1 markus 1643: return;
1644:
1.54 stevesk 1645: debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
1.1 markus 1646:
1647: /* Record that the user has logged out. */
1.85 markus 1648: if (s->pid != 0)
1649: record_logout(s->pid, s->tty);
1.1 markus 1650:
1651: /* Release the pseudo-tty. */
1.130 provos 1652: if (getuid() == 0)
1653: pty_release(s->tty);
1.1 markus 1654:
1655: /*
1656: * Close the server side of the socket pairs. We must do this after
1657: * the pty cleanup, so that another process doesn't get this pty
1658: * while we're still cleaning up.
1659: */
1660: if (close(s->ptymaster) < 0)
1.130 provos 1661: error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
1.108 markus 1662:
1663: /* unlink pty from session */
1664: s->ttyfd = -1;
1.2 markus 1665: }
1666:
1.130 provos 1667: void
1.165 markus 1668: session_pty_cleanup(Session *s)
1.130 provos 1669: {
1.165 markus 1670: PRIVSEP(session_pty_cleanup2(s));
1.130 provos 1671: }
1672:
1.147 markus 1673: static char *
1674: sig2name(int sig)
1675: {
1676: #define SSH_SIG(x) if (sig == SIG ## x) return #x
1677: SSH_SIG(ABRT);
1678: SSH_SIG(ALRM);
1679: SSH_SIG(FPE);
1680: SSH_SIG(HUP);
1681: SSH_SIG(ILL);
1682: SSH_SIG(INT);
1683: SSH_SIG(KILL);
1684: SSH_SIG(PIPE);
1685: SSH_SIG(QUIT);
1686: SSH_SIG(SEGV);
1687: SSH_SIG(TERM);
1688: SSH_SIG(USR1);
1689: SSH_SIG(USR2);
1690: #undef SSH_SIG
1691: return "SIG@openssh.com";
1692: }
1693:
1.94 itojun 1694: static void
1.184 djm 1695: session_close_x11(int id)
1696: {
1697: Channel *c;
1698:
1.189 markus 1699: if ((c = channel_by_id(id)) == NULL) {
1.184 djm 1700: debug("session_close_x11: x11 channel %d missing", id);
1701: } else {
1702: /* Detach X11 listener */
1703: debug("session_close_x11: detach x11 channel %d", id);
1704: channel_cancel_cleanup(id);
1705: if (c->ostate != CHAN_OUTPUT_CLOSED)
1706: chan_mark_dead(c);
1707: }
1708: }
1709:
1710: static void
1711: session_close_single_x11(int id, void *arg)
1712: {
1713: Session *s;
1714: u_int i;
1715:
1716: debug3("session_close_single_x11: channel %d", id);
1717: channel_cancel_cleanup(id);
1718: if ((s = session_by_x11_channel(id)) == NULL)
1719: fatal("session_close_single_x11: no x11 channel %d", id);
1720: for (i = 0; s->x11_chanids[i] != -1; i++) {
1721: debug("session_close_single_x11: session %d: "
1722: "closing channel %d", s->self, s->x11_chanids[i]);
1723: /*
1724: * The channel "id" is already closing, but make sure we
1725: * close all of its siblings.
1726: */
1727: if (s->x11_chanids[i] != id)
1728: session_close_x11(s->x11_chanids[i]);
1729: }
1730: xfree(s->x11_chanids);
1731: s->x11_chanids = NULL;
1732: if (s->display) {
1733: xfree(s->display);
1734: s->display = NULL;
1735: }
1736: if (s->auth_proto) {
1737: xfree(s->auth_proto);
1738: s->auth_proto = NULL;
1739: }
1740: if (s->auth_data) {
1741: xfree(s->auth_data);
1742: s->auth_data = NULL;
1743: }
1744: if (s->auth_display) {
1745: xfree(s->auth_display);
1746: s->auth_display = NULL;
1747: }
1748: }
1749:
1750: static void
1.2 markus 1751: session_exit_message(Session *s, int status)
1752: {
1753: Channel *c;
1.124 markus 1754:
1755: if ((c = channel_lookup(s->chanid)) == NULL)
1.85 markus 1756: fatal("session_exit_message: session %d: no channel %d",
1.2 markus 1757: s->self, s->chanid);
1.137 mpech 1758: debug("session_exit_message: session %d channel %d pid %ld",
1759: s->self, s->chanid, (long)s->pid);
1.2 markus 1760:
1761: if (WIFEXITED(status)) {
1.124 markus 1762: channel_request_start(s->chanid, "exit-status", 0);
1.2 markus 1763: packet_put_int(WEXITSTATUS(status));
1764: packet_send();
1765: } else if (WIFSIGNALED(status)) {
1.124 markus 1766: channel_request_start(s->chanid, "exit-signal", 0);
1.147 markus 1767: packet_put_cstring(sig2name(WTERMSIG(status)));
1.2 markus 1768: packet_put_char(WCOREDUMP(status));
1769: packet_put_cstring("");
1770: packet_put_cstring("");
1771: packet_send();
1772: } else {
1773: /* Some weird exit cause. Just exit. */
1774: packet_disconnect("wait returned status %04x.", status);
1775: }
1776:
1777: /* disconnect channel */
1778: debug("session_exit_message: release channel %d", s->chanid);
1.187 djm 1779:
1780: /*
1781: * Adjust cleanup callback attachment to send close messages when
1.199 deraadt 1782: * the channel gets EOF. The session will be then be closed
1.187 djm 1783: * by session_close_by_channel when the childs close their fds.
1784: */
1785: channel_register_cleanup(c->self, session_close_by_channel, 1);
1786:
1.5 markus 1787: /*
1788: * emulate a write failure with 'chan_write_failed', nobody will be
1789: * interested in data we write.
1790: * Note that we must not call 'chan_read_failed', since there could
1791: * be some more data waiting in the pipe.
1792: */
1.8 markus 1793: if (c->ostate != CHAN_OUTPUT_CLOSED)
1794: chan_write_failed(c);
1.2 markus 1795: }
1796:
1.130 provos 1797: void
1.85 markus 1798: session_close(Session *s)
1.2 markus 1799: {
1.182 djm 1800: u_int i;
1.173 djm 1801:
1.137 mpech 1802: debug("session_close: session %d pid %ld", s->self, (long)s->pid);
1.165 markus 1803: if (s->ttyfd != -1)
1.85 markus 1804: session_pty_cleanup(s);
1.2 markus 1805: if (s->term)
1806: xfree(s->term);
1807: if (s->display)
1808: xfree(s->display);
1.184 djm 1809: if (s->x11_chanids)
1810: xfree(s->x11_chanids);
1.118 stevesk 1811: if (s->auth_display)
1812: xfree(s->auth_display);
1.2 markus 1813: if (s->auth_data)
1814: xfree(s->auth_data);
1815: if (s->auth_proto)
1816: xfree(s->auth_proto);
1817: s->used = 0;
1.173 djm 1818: for (i = 0; i < s->num_env; i++) {
1819: xfree(s->env[i].name);
1820: xfree(s->env[i].val);
1821: }
1822: if (s->env != NULL)
1823: xfree(s->env);
1.9 markus 1824: session_proctitle(s);
1.2 markus 1825: }
1826:
1827: void
1828: session_close_by_pid(pid_t pid, int status)
1829: {
1830: Session *s = session_by_pid(pid);
1831: if (s == NULL) {
1.137 mpech 1832: debug("session_close_by_pid: no session for pid %ld",
1833: (long)pid);
1.2 markus 1834: return;
1835: }
1836: if (s->chanid != -1)
1837: session_exit_message(s, status);
1.187 djm 1838: if (s->ttyfd != -1)
1839: session_pty_cleanup(s);
1.197 djm 1840: s->pid = 0;
1.98 markus 1841: }
1842:
1.2 markus 1843: /*
1844: * this is called when a channel dies before
1845: * the session 'child' itself dies
1846: */
1847: void
1848: session_close_by_channel(int id, void *arg)
1849: {
1850: Session *s = session_by_channel(id);
1.187 djm 1851: u_int i;
1.184 djm 1852:
1.2 markus 1853: if (s == NULL) {
1.107 markus 1854: debug("session_close_by_channel: no session for id %d", id);
1.2 markus 1855: return;
1856: }
1.137 mpech 1857: debug("session_close_by_channel: channel %d child %ld",
1858: id, (long)s->pid);
1.107 markus 1859: if (s->pid != 0) {
1860: debug("session_close_by_channel: channel %d: has child", id);
1.108 markus 1861: /*
1862: * delay detach of session, but release pty, since
1863: * the fd's to the child are already closed
1864: */
1.165 markus 1865: if (s->ttyfd != -1)
1.108 markus 1866: session_pty_cleanup(s);
1.107 markus 1867: return;
1868: }
1869: /* detach by removing callback */
1.2 markus 1870: channel_cancel_cleanup(s->chanid);
1.187 djm 1871:
1872: /* Close any X11 listeners associated with this session */
1873: if (s->x11_chanids != NULL) {
1874: for (i = 0; s->x11_chanids[i] != -1; i++) {
1875: session_close_x11(s->x11_chanids[i]);
1876: s->x11_chanids[i] = -1;
1877: }
1878: }
1879:
1.2 markus 1880: s->chanid = -1;
1.106 markus 1881: session_close(s);
1882: }
1883:
1884: void
1.130 provos 1885: session_destroy_all(void (*closefunc)(Session *))
1.106 markus 1886: {
1887: int i;
1.112 deraadt 1888: for (i = 0; i < MAX_SESSIONS; i++) {
1.106 markus 1889: Session *s = &sessions[i];
1.130 provos 1890: if (s->used) {
1891: if (closefunc != NULL)
1892: closefunc(s);
1893: else
1894: session_close(s);
1895: }
1.2 markus 1896: }
1.9 markus 1897: }
1898:
1.94 itojun 1899: static char *
1.9 markus 1900: session_tty_list(void)
1901: {
1902: static char buf[1024];
1903: int i;
1904: buf[0] = '\0';
1.112 deraadt 1905: for (i = 0; i < MAX_SESSIONS; i++) {
1.9 markus 1906: Session *s = &sessions[i];
1907: if (s->used && s->ttyfd != -1) {
1908: if (buf[0] != '\0')
1909: strlcat(buf, ",", sizeof buf);
1910: strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
1911: }
1912: }
1913: if (buf[0] == '\0')
1914: strlcpy(buf, "notty", sizeof buf);
1915: return buf;
1916: }
1917:
1918: void
1919: session_proctitle(Session *s)
1920: {
1921: if (s->pw == NULL)
1922: error("no user for session %d", s->self);
1923: else
1924: setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1.81 markus 1925: }
1926:
1927: int
1928: session_setup_x11fwd(Session *s)
1929: {
1930: struct stat st;
1.109 stevesk 1931: char display[512], auth_display[512];
1932: char hostname[MAXHOSTNAMELEN];
1.184 djm 1933: u_int i;
1.81 markus 1934:
1935: if (no_x11_forwarding_flag) {
1936: packet_send_debug("X11 forwarding disabled in user configuration file.");
1937: return 0;
1938: }
1939: if (!options.x11_forwarding) {
1940: debug("X11 forwarding disabled in server configuration file.");
1941: return 0;
1942: }
1943: if (!options.xauth_location ||
1944: (stat(options.xauth_location, &st) == -1)) {
1945: packet_send_debug("No xauth program; cannot forward with spoofing.");
1.91 markus 1946: return 0;
1947: }
1948: if (options.use_login) {
1949: packet_send_debug("X11 forwarding disabled; "
1950: "not compatible with UseLogin=yes.");
1.81 markus 1951: return 0;
1952: }
1.87 markus 1953: if (s->display != NULL) {
1.81 markus 1954: debug("X11 display already set.");
1955: return 0;
1956: }
1.140 deraadt 1957: if (x11_create_display_inet(options.x11_display_offset,
1958: options.x11_use_localhost, s->single_connection,
1.184 djm 1959: &s->display_number, &s->x11_chanids) == -1) {
1.87 markus 1960: debug("x11_create_display_inet failed.");
1.81 markus 1961: return 0;
1.184 djm 1962: }
1963: for (i = 0; s->x11_chanids[i] != -1; i++) {
1964: channel_register_cleanup(s->x11_chanids[i],
1.187 djm 1965: session_close_single_x11, 0);
1.81 markus 1966: }
1.109 stevesk 1967:
1968: /* Set up a suitable value for the DISPLAY variable. */
1969: if (gethostname(hostname, sizeof(hostname)) < 0)
1970: fatal("gethostname: %.100s", strerror(errno));
1971: /*
1972: * auth_display must be used as the displayname when the
1973: * authorization entry is added with xauth(1). This will be
1974: * different than the DISPLAY string for localhost displays.
1975: */
1.119 stevesk 1976: if (options.x11_use_localhost) {
1.140 deraadt 1977: snprintf(display, sizeof display, "localhost:%u.%u",
1.109 stevesk 1978: s->display_number, s->screen);
1.140 deraadt 1979: snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
1.118 stevesk 1980: s->display_number, s->screen);
1.109 stevesk 1981: s->display = xstrdup(display);
1.118 stevesk 1982: s->auth_display = xstrdup(auth_display);
1.109 stevesk 1983: } else {
1.140 deraadt 1984: snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
1.109 stevesk 1985: s->display_number, s->screen);
1986: s->display = xstrdup(display);
1.118 stevesk 1987: s->auth_display = xstrdup(display);
1.109 stevesk 1988: }
1989:
1.81 markus 1990: return 1;
1.2 markus 1991: }
1992:
1.94 itojun 1993: static void
1.49 markus 1994: do_authenticated2(Authctxt *authctxt)
1.2 markus 1995: {
1.97 markus 1996: server_loop2(authctxt);
1.165 markus 1997: }
1998:
1999: void
2000: do_cleanup(Authctxt *authctxt)
2001: {
2002: static int called = 0;
2003:
2004: debug("do_cleanup");
2005:
2006: /* no cleanup if we're in the child for login shell */
2007: if (is_child)
2008: return;
2009:
2010: /* avoid double cleanup */
2011: if (called)
2012: return;
2013: called = 1;
2014:
2015: if (authctxt == NULL)
2016: return;
2017: #ifdef KRB5
2018: if (options.kerberos_ticket_cleanup &&
2019: authctxt->krb5_ctx)
2020: krb5_cleanup_proc(authctxt);
1.161 markus 2021: #endif
1.165 markus 2022:
2023: #ifdef GSSAPI
2024: if (compat20 && options.gss_cleanup_creds)
2025: ssh_gssapi_cleanup_creds();
2026: #endif
2027:
2028: /* remove agent socket */
2029: auth_sock_cleanup_proc(authctxt->pw);
2030:
2031: /*
2032: * Cleanup ptys/utmp only if privsep is disabled,
2033: * or if running in monitor.
2034: */
2035: if (!use_privsep || mm_is_monitor())
2036: session_destroy_all(session_pty_cleanup2);
1.1 markus 2037: }
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