Annotation of src/usr.bin/ssh/session.c, Revision 1.316
1.316 ! deraadt 1: /* $OpenBSD: session.c,v 1.315 2019/02/22 03:37:11 djm 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>
1.236 djm 41: #include <sys/queue.h>
1.192 stevesk 42:
1.282 djm 43: #include <ctype.h>
1.209 stevesk 44: #include <errno.h>
1.253 djm 45: #include <fcntl.h>
1.204 stevesk 46: #include <grp.h>
1.223 djm 47: #include <login_cap.h>
1.272 djm 48: #include <netdb.h>
1.192 stevesk 49: #include <paths.h>
1.206 stevesk 50: #include <pwd.h>
1.195 stevesk 51: #include <signal.h>
1.215 stevesk 52: #include <stdio.h>
1.214 stevesk 53: #include <stdlib.h>
1.212 stevesk 54: #include <string.h>
1.211 stevesk 55: #include <unistd.h>
1.277 deraadt 56: #include <limits.h>
1.1 markus 57:
1.216 deraadt 58: #include "xmalloc.h"
1.51 markus 59: #include "ssh.h"
60: #include "ssh2.h"
1.59 djm 61: #include "sshpty.h"
1.1 markus 62: #include "packet.h"
1.303 markus 63: #include "sshbuf.h"
64: #include "ssherr.h"
1.173 djm 65: #include "match.h"
1.1 markus 66: #include "uidswap.h"
67: #include "compat.h"
1.78 markus 68: #include "channels.h"
1.304 markus 69: #include "sshkey.h"
1.216 deraadt 70: #include "cipher.h"
71: #include "kex.h"
72: #include "hostfile.h"
1.2 markus 73: #include "auth.h"
1.19 markus 74: #include "auth-options.h"
1.266 markus 75: #include "authfd.h"
1.50 markus 76: #include "pathnames.h"
1.51 markus 77: #include "log.h"
1.274 millert 78: #include "misc.h"
1.51 markus 79: #include "servconf.h"
1.59 djm 80: #include "sshlogin.h"
1.51 markus 81: #include "serverloop.h"
82: #include "canohost.h"
1.55 itojun 83: #include "session.h"
1.216 deraadt 84: #ifdef GSSAPI
85: #include "ssh-gss.h"
86: #endif
1.130 provos 87: #include "monitor_wrap.h"
1.225 markus 88: #include "sftp.h"
1.290 djm 89: #include "atomicio.h"
1.171 markus 90:
91: #ifdef KRB5
92: #include <kafs.h>
1.161 markus 93: #endif
1.310 djm 94:
1.242 djm 95: #define IS_INTERNAL_SFTP(c) \
96: (!strncmp(c, INTERNAL_SFTP_NAME, sizeof(INTERNAL_SFTP_NAME) - 1) && \
97: (c[sizeof(INTERNAL_SFTP_NAME) - 1] == '\0' || \
98: c[sizeof(INTERNAL_SFTP_NAME) - 1] == ' ' || \
99: c[sizeof(INTERNAL_SFTP_NAME) - 1] == '\t'))
100:
1.1 markus 101: /* func */
102:
103: Session *session_new(void);
1.292 djm 104: void session_set_fds(struct ssh *, Session *, int, int, int, int, int);
1.165 markus 105: void session_pty_cleanup(Session *);
1.94 itojun 106: void session_proctitle(Session *);
1.292 djm 107: int session_setup_x11fwd(struct ssh *, Session *);
108: int do_exec_pty(struct ssh *, Session *, const char *);
109: int do_exec_no_pty(struct ssh *, Session *, const char *);
110: int do_exec(struct ssh *, Session *, const char *);
111: void do_login(struct ssh *, Session *, const char *);
112: void do_child(struct ssh *, Session *, const char *);
1.73 djm 113: void do_motd(void);
1.94 itojun 114: int check_quietlogin(Session *, const char *);
1.1 markus 115:
1.292 djm 116: static void do_authenticated2(struct ssh *, Authctxt *);
1.94 itojun 117:
1.292 djm 118: static int session_pty_req(struct ssh *, Session *);
1.65 markus 119:
1.1 markus 120: /* import */
121: extern ServerOptions options;
122: extern char *__progname;
123: extern int debug_flag;
1.45 markus 124: extern u_int utmp_len;
1.21 markus 125: extern int startup_pipe;
1.74 markus 126: extern void destroy_sensitive_data(void);
1.303 markus 127: extern struct sshbuf *loginmsg;
1.294 djm 128: extern struct sshauthopt *auth_opts;
1.309 djm 129: extern char *tun_fwd_ifnames; /* serverloop.c */
1.21 markus 130:
1.34 markus 131: /* original command from peer. */
1.92 markus 132: const char *original_command = NULL;
1.34 markus 133:
1.1 markus 134: /* data */
1.237 djm 135: static int sessions_first_unused = -1;
136: static int sessions_nalloc = 0;
137: static Session *sessions = NULL;
1.1 markus 138:
1.248 djm 139: #define SUBSYSTEM_NONE 0
140: #define SUBSYSTEM_EXT 1
141: #define SUBSYSTEM_INT_SFTP 2
142: #define SUBSYSTEM_INT_SFTP_ERROR 3
1.225 markus 143:
1.129 provos 144: login_cap_t *lc;
1.28 millert 145:
1.165 markus 146: static int is_child = 0;
1.279 djm 147: static int in_chroot = 0;
1.165 markus 148:
1.290 djm 149: /* File containing userauth info, if ExposeAuthInfo set */
150: static char *auth_info_file = NULL;
151:
1.136 markus 152: /* Name and directory of socket for authentication agent forwarding. */
153: static char *auth_sock_name = NULL;
154: static char *auth_sock_dir = NULL;
155:
156: /* removes the agent forwarding socket */
157:
158: static void
1.165 markus 159: auth_sock_cleanup_proc(struct passwd *pw)
1.136 markus 160: {
161: if (auth_sock_name != NULL) {
162: temporarily_use_uid(pw);
163: unlink(auth_sock_name);
164: rmdir(auth_sock_dir);
165: auth_sock_name = NULL;
166: restore_uid();
167: }
168: }
169:
170: static int
1.292 djm 171: auth_input_request_forwarding(struct ssh *ssh, struct passwd * pw)
1.136 markus 172: {
173: Channel *nc;
1.237 djm 174: int sock = -1;
1.136 markus 175:
176: if (auth_sock_name != NULL) {
177: error("authentication forwarding requested twice.");
178: return 0;
179: }
180:
181: /* Temporarily drop privileged uid for mkdir/bind. */
182: temporarily_use_uid(pw);
183:
184: /* Allocate a buffer for the socket name, and format the name. */
1.237 djm 185: auth_sock_dir = xstrdup("/tmp/ssh-XXXXXXXXXX");
1.136 markus 186:
187: /* Create private directory for socket */
188: if (mkdtemp(auth_sock_dir) == NULL) {
1.312 djm 189: ssh_packet_send_debug(ssh, "Agent forwarding disabled: "
1.136 markus 190: "mkdtemp() failed: %.100s", strerror(errno));
191: restore_uid();
1.265 djm 192: free(auth_sock_dir);
1.136 markus 193: auth_sock_dir = NULL;
1.237 djm 194: goto authsock_err;
1.136 markus 195: }
1.237 djm 196:
197: xasprintf(&auth_sock_name, "%s/agent.%ld",
198: auth_sock_dir, (long) getpid());
1.136 markus 199:
1.274 millert 200: /* Start a Unix listener on auth_sock_name. */
201: sock = unix_listener(auth_sock_name, SSH_LISTEN_BACKLOG, 0);
1.136 markus 202:
203: /* Restore the privileged uid. */
204: restore_uid();
205:
1.274 millert 206: /* Check for socket/bind/listen failure. */
207: if (sock < 0)
1.237 djm 208: goto authsock_err;
1.136 markus 209:
210: /* Allocate a channel for the authentication agent socket. */
1.292 djm 211: nc = channel_new(ssh, "auth socket",
1.136 markus 212: SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
213: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1.156 markus 214: 0, "auth socket", 1);
1.245 djm 215: nc->path = xstrdup(auth_sock_name);
1.136 markus 216: return 1;
1.237 djm 217:
218: authsock_err:
1.265 djm 219: free(auth_sock_name);
1.237 djm 220: if (auth_sock_dir != NULL) {
1.315 djm 221: temporarily_use_uid(pw);
1.237 djm 222: rmdir(auth_sock_dir);
1.315 djm 223: restore_uid();
1.265 djm 224: free(auth_sock_dir);
1.237 djm 225: }
226: if (sock != -1)
227: close(sock);
228: auth_sock_name = NULL;
229: auth_sock_dir = NULL;
230: return 0;
1.136 markus 231: }
232:
1.179 dtucker 233: static void
234: display_loginmsg(void)
235: {
1.303 markus 236: int r;
237:
238: if (sshbuf_len(loginmsg) == 0)
239: return;
240: if ((r = sshbuf_put_u8(loginmsg, 0)) != 0)
241: fatal("%s: buffer error: %s", __func__, ssh_err(r));
242: printf("%s", (char *)sshbuf_ptr(loginmsg));
243: sshbuf_reset(loginmsg);
1.179 dtucker 244: }
1.136 markus 245:
1.290 djm 246: static void
247: prepare_auth_info_file(struct passwd *pw, struct sshbuf *info)
248: {
249: int fd = -1, success = 0;
250:
251: if (!options.expose_userauth_info || info == NULL)
252: return;
253:
254: temporarily_use_uid(pw);
255: auth_info_file = xstrdup("/tmp/sshauth.XXXXXXXXXXXXXXX");
256: if ((fd = mkstemp(auth_info_file)) == -1) {
257: error("%s: mkstemp: %s", __func__, strerror(errno));
258: goto out;
259: }
260: if (atomicio(vwrite, fd, sshbuf_mutable_ptr(info),
261: sshbuf_len(info)) != sshbuf_len(info)) {
262: error("%s: write: %s", __func__, strerror(errno));
263: goto out;
264: }
265: if (close(fd) != 0) {
266: error("%s: close: %s", __func__, strerror(errno));
267: goto out;
268: }
269: success = 1;
270: out:
271: if (!success) {
272: if (fd != -1)
273: close(fd);
274: free(auth_info_file);
275: auth_info_file = NULL;
276: }
277: restore_uid();
278: }
279:
1.294 djm 280: static void
1.297 djm 281: set_fwdpermit_from_authopts(struct ssh *ssh, const struct sshauthopt *opts)
1.294 djm 282: {
283: char *tmp, *cp, *host;
284: int port;
285: size_t i;
286:
1.297 djm 287: if ((options.allow_tcp_forwarding & FORWARD_LOCAL) != 0) {
288: channel_clear_permission(ssh, FORWARD_USER, FORWARD_LOCAL);
289: for (i = 0; i < auth_opts->npermitopen; i++) {
290: tmp = cp = xstrdup(auth_opts->permitopen[i]);
291: /* This shouldn't fail as it has already been checked */
292: if ((host = hpdelim(&cp)) == NULL)
293: fatal("%s: internal error: hpdelim", __func__);
294: host = cleanhostname(host);
295: if (cp == NULL || (port = permitopen_port(cp)) < 0)
296: fatal("%s: internal error: permitopen port",
297: __func__);
298: channel_add_permission(ssh,
299: FORWARD_USER, FORWARD_LOCAL, host, port);
300: free(tmp);
301: }
302: }
303: if ((options.allow_tcp_forwarding & FORWARD_REMOTE) != 0) {
304: channel_clear_permission(ssh, FORWARD_USER, FORWARD_REMOTE);
305: for (i = 0; i < auth_opts->npermitlisten; i++) {
306: tmp = cp = xstrdup(auth_opts->permitlisten[i]);
307: /* This shouldn't fail as it has already been checked */
308: if ((host = hpdelim(&cp)) == NULL)
309: fatal("%s: internal error: hpdelim", __func__);
310: host = cleanhostname(host);
311: if (cp == NULL || (port = permitopen_port(cp)) < 0)
312: fatal("%s: internal error: permitlisten port",
313: __func__);
314: channel_add_permission(ssh,
315: FORWARD_USER, FORWARD_REMOTE, host, port);
316: free(tmp);
317: }
1.294 djm 318: }
319: }
320:
1.65 markus 321: void
1.292 djm 322: do_authenticated(struct ssh *ssh, Authctxt *authctxt)
1.65 markus 323: {
1.153 markus 324: setproctitle("%s", authctxt->pw->pw_name);
325:
1.294 djm 326: auth_log_authopts("active", auth_opts, 0);
327:
1.65 markus 328: /* setup the channel layer */
1.274 millert 329: /* XXX - streamlocal? */
1.297 djm 330: set_fwdpermit_from_authopts(ssh, auth_opts);
1.296 djm 331:
1.294 djm 332: if (!auth_opts->permit_port_forwarding_flag ||
1.296 djm 333: options.disable_forwarding) {
334: channel_disable_admin(ssh, FORWARD_LOCAL);
335: channel_disable_admin(ssh, FORWARD_REMOTE);
336: } else {
337: if ((options.allow_tcp_forwarding & FORWARD_LOCAL) == 0)
338: channel_disable_admin(ssh, FORWARD_LOCAL);
339: else
340: channel_permit_all(ssh, FORWARD_LOCAL);
341: if ((options.allow_tcp_forwarding & FORWARD_REMOTE) == 0)
342: channel_disable_admin(ssh, FORWARD_REMOTE);
343: else
344: channel_permit_all(ssh, FORWARD_REMOTE);
345: }
1.311 djm 346: auth_debug_send(ssh);
1.65 markus 347:
1.290 djm 348: prepare_auth_info_file(authctxt->pw, authctxt->session_info);
349:
1.292 djm 350: do_authenticated2(ssh, authctxt);
1.290 djm 351:
1.292 djm 352: do_cleanup(ssh, authctxt);
1.65 markus 353: }
354:
1.282 djm 355: /* Check untrusted xauth strings for metacharacters */
356: static int
357: xauth_valid_string(const char *s)
358: {
359: size_t i;
360:
361: for (i = 0; s[i] != '\0'; i++) {
362: if (!isalnum((u_char)s[i]) &&
363: s[i] != '.' && s[i] != ':' && s[i] != '/' &&
364: s[i] != '-' && s[i] != '_')
1.305 deraadt 365: return 0;
1.282 djm 366: }
367: return 1;
368: }
369:
1.269 dtucker 370: #define USE_PIPES 1
1.1 markus 371: /*
372: * This is called to fork and execute a command when we have no tty. This
373: * will call do_child from the child, and server_loop from the parent after
374: * setting up file descriptors and such.
375: */
1.237 djm 376: int
1.292 djm 377: do_exec_no_pty(struct ssh *ssh, Session *s, const char *command)
1.1 markus 378: {
1.137 mpech 379: pid_t pid;
1.238 markus 380: #ifdef USE_PIPES
381: int pin[2], pout[2], perr[2];
382:
1.253 djm 383: if (s == NULL)
384: fatal("do_exec_no_pty: no session");
385:
1.238 markus 386: /* Allocate pipes for communicating with the program. */
1.316 ! deraadt 387: if (pipe(pin) == -1) {
1.238 markus 388: error("%s: pipe in: %.100s", __func__, strerror(errno));
389: return -1;
390: }
1.316 ! deraadt 391: if (pipe(pout) == -1) {
1.238 markus 392: error("%s: pipe out: %.100s", __func__, strerror(errno));
393: close(pin[0]);
394: close(pin[1]);
395: return -1;
396: }
1.316 ! deraadt 397: if (pipe(perr) == -1) {
1.256 djm 398: error("%s: pipe err: %.100s", __func__,
399: strerror(errno));
400: close(pin[0]);
401: close(pin[1]);
402: close(pout[0]);
403: close(pout[1]);
404: return -1;
1.238 markus 405: }
406: #else
1.237 djm 407: int inout[2], err[2];
1.1 markus 408:
1.253 djm 409: if (s == NULL)
410: fatal("do_exec_no_pty: no session");
411:
1.1 markus 412: /* Uses socket pairs to communicate with the program. */
1.316 ! deraadt 413: if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) == -1) {
1.237 djm 414: error("%s: socketpair #1: %.100s", __func__, strerror(errno));
415: return -1;
416: }
1.316 ! deraadt 417: if (socketpair(AF_UNIX, SOCK_STREAM, 0, err) == -1) {
1.256 djm 418: error("%s: socketpair #2: %.100s", __func__,
419: strerror(errno));
420: close(inout[0]);
421: close(inout[1]);
422: return -1;
1.237 djm 423: }
1.238 markus 424: #endif
1.237 djm 425:
1.9 markus 426: session_proctitle(s);
1.1 markus 427:
428: /* Fork the child. */
1.237 djm 429: switch ((pid = fork())) {
430: case -1:
431: error("%s: fork: %.100s", __func__, strerror(errno));
1.238 markus 432: #ifdef USE_PIPES
433: close(pin[0]);
434: close(pin[1]);
435: close(pout[0]);
436: close(pout[1]);
1.256 djm 437: close(perr[0]);
1.238 markus 438: close(perr[1]);
439: #else
1.237 djm 440: close(inout[0]);
441: close(inout[1]);
442: close(err[0]);
1.256 djm 443: close(err[1]);
1.238 markus 444: #endif
1.237 djm 445: return -1;
446: case 0:
1.165 markus 447: is_child = 1;
1.144 markus 448:
1.1 markus 449: /*
450: * Create a new session and process group since the 4.4BSD
451: * setlogin() affects the entire process group.
452: */
1.316 ! deraadt 453: if (setsid() == -1)
1.1 markus 454: error("setsid failed: %.100s", strerror(errno));
455:
1.238 markus 456: #ifdef USE_PIPES
457: /*
458: * Redirect stdin. We close the parent side of the socket
459: * pair, and make the child side the standard input.
460: */
461: close(pin[1]);
1.316 ! deraadt 462: if (dup2(pin[0], 0) == -1)
1.238 markus 463: perror("dup2 stdin");
464: close(pin[0]);
465:
466: /* Redirect stdout. */
467: close(pout[0]);
1.316 ! deraadt 468: if (dup2(pout[1], 1) == -1)
1.238 markus 469: perror("dup2 stdout");
470: close(pout[1]);
471:
472: /* Redirect stderr. */
1.256 djm 473: close(perr[0]);
1.316 ! deraadt 474: if (dup2(perr[1], 2) == -1)
1.238 markus 475: perror("dup2 stderr");
476: close(perr[1]);
477: #else
1.1 markus 478: /*
479: * Redirect stdin, stdout, and stderr. Stdin and stdout will
480: * use the same socket, as some programs (particularly rdist)
481: * seem to depend on it.
482: */
483: close(inout[1]);
1.256 djm 484: close(err[1]);
1.316 ! deraadt 485: if (dup2(inout[0], 0) == -1) /* stdin */
1.1 markus 486: perror("dup2 stdin");
1.316 ! deraadt 487: if (dup2(inout[0], 1) == -1) /* stdout (same as stdin) */
1.1 markus 488: perror("dup2 stdout");
1.238 markus 489: close(inout[0]);
1.316 ! deraadt 490: if (dup2(err[0], 2) == -1) /* stderr */
1.1 markus 491: perror("dup2 stderr");
1.238 markus 492: close(err[0]);
493: #endif
1.1 markus 494:
495: /* Do processing for the child (exec command etc). */
1.292 djm 496: do_child(ssh, s, command);
1.1 markus 497: /* NOTREACHED */
1.237 djm 498: default:
499: break;
1.1 markus 500: }
1.237 djm 501:
1.1 markus 502: s->pid = pid;
1.47 markus 503: /* Set interactive/non-interactive mode. */
1.312 djm 504: ssh_packet_set_interactive(ssh, s->display != NULL,
1.257 djm 505: options.ip_qos_interactive, options.ip_qos_bulk);
1.1 markus 506:
1.238 markus 507: #ifdef USE_PIPES
508: /* We are the parent. Close the child sides of the pipes. */
509: close(pin[0]);
510: close(pout[1]);
511: close(perr[1]);
512:
1.292 djm 513: session_set_fds(ssh, s, pin[1], pout[0], perr[0],
1.283 markus 514: s->is_subsystem, 0);
1.238 markus 515: #else
1.1 markus 516: /* We are the parent. Close the child sides of the socket pairs. */
517: close(inout[0]);
518: close(err[0]);
519:
520: /*
521: * Enter the interactive session. Note: server_loop must be able to
522: * handle the case that fdin and fdout are the same.
523: */
1.313 dtucker 524: session_set_fds(ssh, s, inout[1], inout[1], err[1],
1.283 markus 525: s->is_subsystem, 0);
1.238 markus 526: #endif
1.237 djm 527: return 0;
1.1 markus 528: }
529:
530: /*
531: * This is called to fork and execute a command when we have a tty. This
532: * will call do_child from the child, and server_loop from the parent after
533: * setting up file descriptors, controlling tty, updating wtmp, utmp,
534: * lastlog, and other such operations.
535: */
1.237 djm 536: int
1.292 djm 537: do_exec_pty(struct ssh *ssh, Session *s, const char *command)
1.1 markus 538: {
539: int fdout, ptyfd, ttyfd, ptymaster;
540: pid_t pid;
541:
542: if (s == NULL)
543: fatal("do_exec_pty: no session");
544: ptyfd = s->ptyfd;
545: ttyfd = s->ttyfd;
546:
1.237 djm 547: /*
548: * Create another descriptor of the pty master side for use as the
549: * standard input. We could use the original descriptor, but this
550: * simplifies code in server_loop. The descriptor is bidirectional.
551: * Do this before forking (and cleanup in the child) so as to
552: * detect and gracefully fail out-of-fd conditions.
553: */
1.316 ! deraadt 554: if ((fdout = dup(ptyfd)) == -1) {
1.237 djm 555: error("%s: dup #1: %s", __func__, strerror(errno));
556: close(ttyfd);
557: close(ptyfd);
558: return -1;
559: }
560: /* we keep a reference to the pty master */
1.316 ! deraadt 561: if ((ptymaster = dup(ptyfd)) == -1) {
1.237 djm 562: error("%s: dup #2: %s", __func__, strerror(errno));
563: close(ttyfd);
564: close(ptyfd);
565: close(fdout);
566: return -1;
567: }
568:
1.1 markus 569: /* Fork the child. */
1.237 djm 570: switch ((pid = fork())) {
571: case -1:
572: error("%s: fork: %.100s", __func__, strerror(errno));
573: close(fdout);
574: close(ptymaster);
575: close(ttyfd);
576: close(ptyfd);
577: return -1;
578: case 0:
1.165 markus 579: is_child = 1;
1.97 markus 580:
1.237 djm 581: close(fdout);
582: close(ptymaster);
583:
1.1 markus 584: /* Close the master side of the pseudo tty. */
585: close(ptyfd);
586:
587: /* Make the pseudo tty our controlling tty. */
588: pty_make_controlling_tty(&ttyfd, s->tty);
589:
1.103 markus 590: /* Redirect stdin/stdout/stderr from the pseudo tty. */
1.316 ! deraadt 591: if (dup2(ttyfd, 0) == -1)
1.103 markus 592: error("dup2 stdin: %s", strerror(errno));
1.316 ! deraadt 593: if (dup2(ttyfd, 1) == -1)
1.103 markus 594: error("dup2 stdout: %s", strerror(errno));
1.316 ! deraadt 595: if (dup2(ttyfd, 2) == -1)
1.103 markus 596: error("dup2 stderr: %s", strerror(errno));
1.1 markus 597:
598: /* Close the extra descriptor for the pseudo tty. */
599: close(ttyfd);
600:
1.24 markus 601: /* record login, etc. similar to login(1) */
1.292 djm 602: do_login(ssh, s, command);
1.228 djm 603:
1.237 djm 604: /*
605: * Do common processing for the child, such as execing
606: * the command.
607: */
1.292 djm 608: do_child(ssh, s, command);
1.1 markus 609: /* NOTREACHED */
1.237 djm 610: default:
611: break;
1.1 markus 612: }
613: s->pid = pid;
614:
615: /* Parent. Close the slave side of the pseudo tty. */
616: close(ttyfd);
617:
1.237 djm 618: /* Enter interactive session. */
1.1 markus 619: s->ptymaster = ptymaster;
1.312 djm 620: ssh_packet_set_interactive(ssh, 1,
1.257 djm 621: options.ip_qos_interactive, options.ip_qos_bulk);
1.292 djm 622: session_set_fds(ssh, s, ptyfd, fdout, -1, 1, 1);
1.237 djm 623: return 0;
1.24 markus 624: }
625:
1.90 markus 626: /*
627: * This is called to fork and execute a command. If another command is
628: * to be forced, execute that instead.
629: */
1.237 djm 630: int
1.292 djm 631: do_exec(struct ssh *ssh, Session *s, const char *command)
1.90 markus 632: {
1.237 djm 633: int ret;
1.280 djm 634: const char *forced = NULL, *tty = NULL;
635: char session_type[1024];
1.237 djm 636:
1.210 dtucker 637: if (options.adm_forced_command) {
638: original_command = command;
639: command = options.adm_forced_command;
1.267 djm 640: forced = "(config)";
1.294 djm 641: } else if (auth_opts->force_command != NULL) {
1.90 markus 642: original_command = command;
1.294 djm 643: command = auth_opts->force_command;
1.267 djm 644: forced = "(key-option)";
645: }
1.306 djm 646: s->forced = 0;
1.267 djm 647: if (forced != NULL) {
1.306 djm 648: s->forced = 1;
1.248 djm 649: if (IS_INTERNAL_SFTP(command)) {
650: s->is_subsystem = s->is_subsystem ?
651: SUBSYSTEM_INT_SFTP : SUBSYSTEM_INT_SFTP_ERROR;
652: } else if (s->is_subsystem)
1.225 markus 653: s->is_subsystem = SUBSYSTEM_EXT;
1.267 djm 654: snprintf(session_type, sizeof(session_type),
655: "forced-command %s '%.900s'", forced, command);
656: } else if (s->is_subsystem) {
657: snprintf(session_type, sizeof(session_type),
658: "subsystem '%.900s'", s->subsys);
659: } else if (command == NULL) {
660: snprintf(session_type, sizeof(session_type), "shell");
661: } else {
662: /* NB. we don't log unforced commands to preserve privacy */
663: snprintf(session_type, sizeof(session_type), "command");
1.90 markus 664: }
1.163 markus 665:
1.267 djm 666: if (s->ttyfd != -1) {
667: tty = s->tty;
668: if (strncmp(tty, "/dev/", 5) == 0)
669: tty += 5;
670: }
671:
1.280 djm 672: verbose("Starting session: %s%s%s for %s from %.200s port %d id %d",
1.267 djm 673: session_type,
674: tty == NULL ? "" : " on ",
675: tty == NULL ? "" : tty,
676: s->pw->pw_name,
1.281 djm 677: ssh_remote_ipaddr(ssh),
678: ssh_remote_port(ssh),
1.280 djm 679: s->self);
1.267 djm 680:
1.163 markus 681: #ifdef GSSAPI
682: if (options.gss_authentication) {
683: temporarily_use_uid(s->pw);
684: ssh_gssapi_storecreds();
685: restore_uid();
686: }
687: #endif
1.90 markus 688: if (s->ttyfd != -1)
1.292 djm 689: ret = do_exec_pty(ssh, s, command);
1.90 markus 690: else
1.292 djm 691: ret = do_exec_no_pty(ssh, s, command);
1.90 markus 692:
1.92 markus 693: original_command = NULL;
1.179 dtucker 694:
695: /*
696: * Clear loginmsg: it's the child's responsibility to display
697: * it to the user, otherwise multiple sessions may accumulate
698: * multiple copies of the login messages.
699: */
1.303 markus 700: sshbuf_reset(loginmsg);
1.237 djm 701:
702: return ret;
1.90 markus 703: }
704:
705:
1.24 markus 706: /* administrative, login(1)-like work */
707: void
1.292 djm 708: do_login(struct ssh *ssh, Session *s, const char *command)
1.24 markus 709: {
710: socklen_t fromlen;
711: struct sockaddr_storage from;
712: struct passwd * pw = s->pw;
713: pid_t pid = getpid();
714:
715: /*
716: * Get IP address of client. If the connection is not a socket, let
717: * the address be 0.0.0.0.
718: */
719: memset(&from, 0, sizeof(from));
1.148 stevesk 720: fromlen = sizeof(from);
1.312 djm 721: if (ssh_packet_connection_is_on_socket(ssh)) {
722: if (getpeername(ssh_packet_get_connection_in(ssh),
1.316 ! deraadt 723: (struct sockaddr *)&from, &fromlen) == -1) {
1.24 markus 724: debug("getpeername: %.100s", strerror(errno));
1.165 markus 725: cleanup_exit(255);
1.24 markus 726: }
727: }
1.25 markus 728:
1.24 markus 729: /* Record that there was a login on that tty from the remote host. */
1.133 markus 730: if (!use_privsep)
731: record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
1.281 djm 732: session_get_remote_name_or_ip(ssh, utmp_len,
1.158 markus 733: options.use_dns),
1.148 stevesk 734: (struct sockaddr *)&from, fromlen);
1.24 markus 735:
1.73 djm 736: if (check_quietlogin(s, command))
1.24 markus 737: return;
1.73 djm 738:
1.179 dtucker 739: display_loginmsg();
1.73 djm 740:
741: do_motd();
742: }
743:
744: /*
745: * Display the message of the day.
746: */
747: void
748: do_motd(void)
749: {
750: FILE *f;
751: char buf[256];
752:
1.24 markus 753: if (options.print_motd) {
1.28 millert 754: f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
755: "/etc/motd"), "r");
1.24 markus 756: if (f) {
757: while (fgets(buf, sizeof(buf), f))
758: fputs(buf, stdout);
759: fclose(f);
760: }
1.2 markus 761: }
1.73 djm 762: }
763:
764:
765: /*
766: * Check for quiet login, either .hushlogin or command given.
767: */
768: int
769: check_quietlogin(Session *s, const char *command)
770: {
771: char buf[256];
1.96 dugsong 772: struct passwd *pw = s->pw;
1.73 djm 773: struct stat st;
774:
775: /* Return 1 if .hushlogin exists or a command given. */
776: if (command != NULL)
777: return 1;
778: snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
779: if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
780: return 1;
781: return 0;
1.1 markus 782: }
783:
784: /*
785: * Reads environment variables from the given file and adds/overrides them
786: * into the environment. If the file does not exist, this does nothing.
787: * Otherwise, it must consist of empty lines, comments (line starts with '#')
788: * and assignments of the form name=value. No other forms are allowed.
1.301 djm 789: * If whitelist is not NULL, then it is interpreted as a pattern list and
790: * only variable names that match it will be accepted.
1.1 markus 791: */
1.94 itojun 792: static void
1.45 markus 793: read_environment_file(char ***env, u_int *envsize,
1.301 djm 794: const char *filename, const char *whitelist)
1.1 markus 795: {
796: FILE *f;
1.298 markus 797: char *line = NULL, *cp, *value;
798: size_t linesize = 0;
1.142 deraadt 799: u_int lineno = 0;
1.1 markus 800:
801: f = fopen(filename, "r");
802: if (!f)
803: return;
804:
1.298 markus 805: while (getline(&line, &linesize, f) != -1) {
1.142 deraadt 806: if (++lineno > 1000)
807: fatal("Too many lines in environment file %s", filename);
1.298 markus 808: for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
1.1 markus 809: ;
810: if (!*cp || *cp == '#' || *cp == '\n')
811: continue;
1.224 gilles 812:
813: cp[strcspn(cp, "\n")] = '\0';
814:
1.1 markus 815: value = strchr(cp, '=');
816: if (value == NULL) {
1.142 deraadt 817: fprintf(stderr, "Bad line %u in %.100s\n", lineno,
818: filename);
1.1 markus 819: continue;
820: }
1.14 deraadt 821: /*
822: * Replace the equals sign by nul, and advance value to
823: * the value string.
824: */
1.1 markus 825: *value = '\0';
826: value++;
1.301 djm 827: if (whitelist != NULL &&
828: match_pattern_list(cp, whitelist, 0) != 1)
829: continue;
1.1 markus 830: child_set_env(env, envsize, cp, value);
831: }
1.298 markus 832: free(line);
1.1 markus 833: fclose(f);
834: }
835:
1.127 markus 836: static char **
1.292 djm 837: do_setup_env(struct ssh *ssh, Session *s, const char *shell)
1.1 markus 838: {
839: char buf[256];
1.294 djm 840: size_t n;
1.127 markus 841: u_int i, envsize;
1.300 djm 842: char *ocp, *cp, *value, **env, *laddr;
1.127 markus 843: struct passwd *pw = s->pw;
1.1 markus 844:
845: /* Initialize the environment. */
846: envsize = 100;
1.220 djm 847: env = xcalloc(envsize, sizeof(char *));
1.1 markus 848: env[0] = NULL;
849:
1.161 markus 850: #ifdef GSSAPI
1.168 djm 851: /* Allow any GSSAPI methods that we've used to alter
1.161 markus 852: * the childs environment as they see fit
853: */
854: ssh_gssapi_do_child(&env, &envsize);
855: #endif
856:
1.284 djm 857: /* Set basic environment. */
858: for (i = 0; i < s->num_env; i++)
859: child_set_env(&env, &envsize, s->env[i].name, s->env[i].val);
860:
861: child_set_env(&env, &envsize, "USER", pw->pw_name);
862: child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
863: child_set_env(&env, &envsize, "HOME", pw->pw_dir);
864: if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
865: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
866: else
867: child_set_env(&env, &envsize, "PATH", getenv("PATH"));
868:
869: snprintf(buf, sizeof buf, "%.200s/%.50s", _PATH_MAILDIR, pw->pw_name);
870: child_set_env(&env, &envsize, "MAIL", buf);
871:
872: /* Normal systems set SHELL by default. */
873: child_set_env(&env, &envsize, "SHELL", shell);
1.1 markus 874:
875: if (getenv("TZ"))
876: child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1.299 djm 877: if (s->term)
878: child_set_env(&env, &envsize, "TERM", s->term);
879: if (s->display)
880: child_set_env(&env, &envsize, "DISPLAY", s->display);
881: #ifdef KRB5
882: if (s->authctxt->krb5_ticket_file)
883: child_set_env(&env, &envsize, "KRB5CCNAME",
884: s->authctxt->krb5_ticket_file);
885: #endif
886: if (auth_sock_name != NULL)
887: child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
888: auth_sock_name);
889:
1.1 markus 890:
1.294 djm 891: /* Set custom environment options from pubkey authentication. */
892: if (options.permit_user_env) {
893: for (n = 0 ; n < auth_opts->nenv; n++) {
894: ocp = xstrdup(auth_opts->env[n]);
895: cp = strchr(ocp, '=');
896: if (*cp == '=') {
897: *cp = '\0';
1.301 djm 898: /* Apply PermitUserEnvironment whitelist */
899: if (options.permit_user_env_whitelist == NULL ||
900: match_pattern_list(ocp,
901: options.permit_user_env_whitelist, 0) == 1)
902: child_set_env(&env, &envsize,
903: ocp, cp + 1);
1.294 djm 904: }
905: free(ocp);
906: }
1.1 markus 907: }
908:
1.299 djm 909: /* read $HOME/.ssh/environment. */
910: if (options.permit_user_env) {
911: snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
912: pw->pw_dir);
1.301 djm 913: read_environment_file(&env, &envsize, buf,
914: options.permit_user_env_whitelist);
1.300 djm 915: }
916:
917: /* Environment specified by admin */
918: for (i = 0; i < options.num_setenv; i++) {
919: cp = xstrdup(options.setenv[i]);
920: if ((value = strchr(cp, '=')) == NULL) {
921: /* shouldn't happen; vars are checked in servconf.c */
922: fatal("Invalid config SetEnv: %s", options.setenv[i]);
923: }
924: *value++ = '\0';
925: child_set_env(&env, &envsize, cp, value);
1.299 djm 926: }
927:
1.149 stevesk 928: /* SSH_CLIENT deprecated */
1.1 markus 929: snprintf(buf, sizeof buf, "%.50s %d %d",
1.281 djm 930: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh),
931: ssh_local_port(ssh));
1.1 markus 932: child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1.149 stevesk 933:
1.312 djm 934: laddr = get_local_ipaddr(ssh_packet_get_connection_in(ssh));
1.149 stevesk 935: snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1.281 djm 936: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh),
937: laddr, ssh_local_port(ssh));
1.265 djm 938: free(laddr);
1.149 stevesk 939: child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1.1 markus 940:
1.293 djm 941: if (tun_fwd_ifnames != NULL)
942: child_set_env(&env, &envsize, "SSH_TUNNEL", tun_fwd_ifnames);
1.290 djm 943: if (auth_info_file != NULL)
944: child_set_env(&env, &envsize, "SSH_USER_AUTH", auth_info_file);
1.60 markus 945: if (s->ttyfd != -1)
946: child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1.34 markus 947: if (original_command)
948: child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
949: original_command);
1.1 markus 950:
951: if (debug_flag) {
952: /* dump the environment */
953: fprintf(stderr, "Environment:\n");
954: for (i = 0; env[i]; i++)
955: fprintf(stderr, " %.200s\n", env[i]);
956: }
1.127 markus 957: return env;
958: }
959:
960: /*
961: * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
962: * first in this order).
963: */
964: static void
1.294 djm 965: do_rc_files(struct ssh *ssh, Session *s, const char *shell)
1.127 markus 966: {
967: FILE *f = NULL;
968: char cmd[1024];
969: int do_xauth;
970: struct stat st;
971:
972: do_xauth =
973: s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
974:
1.231 djm 975: /* ignore _PATH_SSH_USER_RC for subsystems and admin forced commands */
1.232 djm 976: if (!s->is_subsystem && options.adm_forced_command == NULL &&
1.294 djm 977: auth_opts->permit_user_rc && options.permit_user_rc &&
1.273 djm 978: stat(_PATH_SSH_USER_RC, &st) >= 0) {
1.127 markus 979: snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
980: shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
981: if (debug_flag)
982: fprintf(stderr, "Running %s\n", cmd);
983: f = popen(cmd, "w");
984: if (f) {
985: if (do_xauth)
986: fprintf(f, "%s %s\n", s->auth_proto,
987: s->auth_data);
988: pclose(f);
989: } else
990: fprintf(stderr, "Could not run %s\n",
991: _PATH_SSH_USER_RC);
992: } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
993: if (debug_flag)
994: fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
995: _PATH_SSH_SYSTEM_RC);
996: f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
997: if (f) {
998: if (do_xauth)
999: fprintf(f, "%s %s\n", s->auth_proto,
1000: s->auth_data);
1001: pclose(f);
1002: } else
1003: fprintf(stderr, "Could not run %s\n",
1004: _PATH_SSH_SYSTEM_RC);
1005: } else if (do_xauth && options.xauth_location != NULL) {
1006: /* Add authority data to .Xauthority if appropriate. */
1007: if (debug_flag) {
1008: fprintf(stderr,
1.151 stevesk 1009: "Running %.500s remove %.100s\n",
1.165 markus 1010: options.xauth_location, s->auth_display);
1.151 stevesk 1011: fprintf(stderr,
1012: "%.500s add %.100s %.100s %.100s\n",
1.127 markus 1013: options.xauth_location, s->auth_display,
1014: s->auth_proto, s->auth_data);
1015: }
1016: snprintf(cmd, sizeof cmd, "%s -q -",
1017: options.xauth_location);
1018: f = popen(cmd, "w");
1019: if (f) {
1.151 stevesk 1020: fprintf(f, "remove %s\n",
1021: s->auth_display);
1.127 markus 1022: fprintf(f, "add %s %s %s\n",
1023: s->auth_display, s->auth_proto,
1024: s->auth_data);
1025: pclose(f);
1026: } else {
1027: fprintf(stderr, "Could not run %s\n",
1028: cmd);
1029: }
1030: }
1031: }
1032:
1033: static void
1034: do_nologin(struct passwd *pw)
1035: {
1036: FILE *f = NULL;
1.251 dtucker 1037: char buf[1024], *nl, *def_nl = _PATH_NOLOGIN;
1038: struct stat sb;
1.127 markus 1039:
1.260 guenther 1040: if (login_getcapbool(lc, "ignorenologin", 0) || pw->pw_uid == 0)
1.251 dtucker 1041: return;
1042: nl = login_getcapstr(lc, "nologin", def_nl, def_nl);
1043:
1044: if (stat(nl, &sb) == -1) {
1045: if (nl != def_nl)
1.265 djm 1046: free(nl);
1.251 dtucker 1047: return;
1048: }
1049:
1050: /* /etc/nologin exists. Print its contents if we can and exit. */
1051: logit("User %.100s not allowed because %s exists", pw->pw_name, nl);
1052: if ((f = fopen(nl, "r")) != NULL) {
1.127 markus 1053: while (fgets(buf, sizeof(buf), f))
1054: fputs(buf, stderr);
1055: fclose(f);
1056: }
1.251 dtucker 1057: exit(254);
1.127 markus 1058: }
1059:
1.226 djm 1060: /*
1061: * Chroot into a directory after checking it for safety: all path components
1062: * must be root-owned directories with strict permissions.
1063: */
1064: static void
1065: safely_chroot(const char *path, uid_t uid)
1066: {
1067: const char *cp;
1.277 deraadt 1068: char component[PATH_MAX];
1.226 djm 1069: struct stat st;
1070:
1.308 djm 1071: if (!path_absolute(path))
1.226 djm 1072: fatal("chroot path does not begin at root");
1073: if (strlen(path) >= sizeof(component))
1074: fatal("chroot path too long");
1075:
1076: /*
1077: * Descend the path, checking that each component is a
1078: * root-owned directory with strict permissions.
1079: */
1080: for (cp = path; cp != NULL;) {
1081: if ((cp = strchr(cp, '/')) == NULL)
1082: strlcpy(component, path, sizeof(component));
1083: else {
1084: cp++;
1085: memcpy(component, path, cp - path);
1086: component[cp - path] = '\0';
1087: }
1088:
1089: debug3("%s: checking '%s'", __func__, component);
1090:
1091: if (stat(component, &st) != 0)
1092: fatal("%s: stat(\"%s\"): %s", __func__,
1093: component, strerror(errno));
1094: if (st.st_uid != 0 || (st.st_mode & 022) != 0)
1095: fatal("bad ownership or modes for chroot "
1.312 djm 1096: "directory %s\"%s\"",
1.226 djm 1097: cp == NULL ? "" : "component ", component);
1098: if (!S_ISDIR(st.st_mode))
1099: fatal("chroot path %s\"%s\" is not a directory",
1100: cp == NULL ? "" : "component ", component);
1101:
1102: }
1103:
1104: if (chdir(path) == -1)
1105: fatal("Unable to chdir to chroot path \"%s\": "
1106: "%s", path, strerror(errno));
1107: if (chroot(path) == -1)
1108: fatal("chroot(\"%s\"): %s", path, strerror(errno));
1109: if (chdir("/") == -1)
1110: fatal("%s: chdir(/) after chroot: %s",
1111: __func__, strerror(errno));
1112: verbose("Changed root directory to \"%s\"", path);
1113: }
1114:
1.127 markus 1115: /* Set login name, uid, gid, and groups. */
1.130 provos 1116: void
1.127 markus 1117: do_setusercontext(struct passwd *pw)
1118: {
1.295 djm 1119: char uidstr[32], *chroot_path, *tmp;
1.227 djm 1120:
1.127 markus 1121: if (getuid() == 0 || geteuid() == 0) {
1.226 djm 1122: /* Prepare groups */
1.127 markus 1123: if (setusercontext(lc, pw, pw->pw_uid,
1.226 djm 1124: (LOGIN_SETALL & ~(LOGIN_SETPATH|LOGIN_SETUSER))) < 0) {
1.127 markus 1125: perror("unable to set user context");
1126: exit(1);
1127: }
1.226 djm 1128:
1.279 djm 1129: if (!in_chroot && options.chroot_directory != NULL &&
1.226 djm 1130: strcasecmp(options.chroot_directory, "none") != 0) {
1.227 djm 1131: tmp = tilde_expand_filename(options.chroot_directory,
1132: pw->pw_uid);
1.295 djm 1133: snprintf(uidstr, sizeof(uidstr), "%llu",
1134: (unsigned long long)pw->pw_uid);
1.227 djm 1135: chroot_path = percent_expand(tmp, "h", pw->pw_dir,
1.295 djm 1136: "u", pw->pw_name, "U", uidstr, (char *)NULL);
1.226 djm 1137: safely_chroot(chroot_path, pw->pw_uid);
1.227 djm 1138: free(tmp);
1.226 djm 1139: free(chroot_path);
1.264 djm 1140: /* Make sure we don't attempt to chroot again */
1141: free(options.chroot_directory);
1142: options.chroot_directory = NULL;
1.279 djm 1143: in_chroot = 1;
1.226 djm 1144: }
1145:
1146: /* Set UID */
1147: if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETUSER) < 0) {
1148: perror("unable to set user context (setuser)");
1149: exit(1);
1150: }
1.264 djm 1151: } else if (options.chroot_directory != NULL &&
1152: strcasecmp(options.chroot_directory, "none") != 0) {
1153: fatal("server lacks privileges to chroot to ChrootDirectory");
1.263 dtucker 1154: }
1.264 djm 1155:
1.127 markus 1156: if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
1157: fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
1158: }
1159:
1.131 markus 1160: static void
1.172 markus 1161: do_pwchange(Session *s)
1162: {
1.179 dtucker 1163: fflush(NULL);
1.172 markus 1164: fprintf(stderr, "WARNING: Your password has expired.\n");
1165: if (s->ttyfd != -1) {
1.178 deraadt 1166: fprintf(stderr,
1.172 markus 1167: "You must change your password now and login again!\n");
1168: execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
1169: perror("passwd");
1170: } else {
1171: fprintf(stderr,
1172: "Password change required but no TTY available.\n");
1173: }
1174: exit(1);
1175: }
1176:
1177: static void
1.292 djm 1178: child_close_fds(struct ssh *ssh)
1.172 markus 1179: {
1.276 djm 1180: extern int auth_sock;
1.266 markus 1181:
1.276 djm 1182: if (auth_sock != -1) {
1183: close(auth_sock);
1184: auth_sock = -1;
1.266 markus 1185: }
1186:
1.312 djm 1187: if (ssh_packet_get_connection_in(ssh) ==
1188: ssh_packet_get_connection_out(ssh))
1189: close(ssh_packet_get_connection_in(ssh));
1.172 markus 1190: else {
1.312 djm 1191: close(ssh_packet_get_connection_in(ssh));
1192: close(ssh_packet_get_connection_out(ssh));
1.172 markus 1193: }
1194: /*
1195: * Close all descriptors related to channels. They will still remain
1196: * open in the parent.
1197: */
1198: /* XXX better use close-on-exec? -markus */
1.292 djm 1199: channel_close_all(ssh);
1.172 markus 1200:
1201: /*
1202: * Close any extra file descriptors. Note that there may still be
1203: * descriptors left by system functions. They will be closed later.
1204: */
1205: endpwent();
1206:
1207: /*
1.188 djm 1208: * Close any extra open file descriptors so that we don't have them
1.172 markus 1209: * hanging around in clients. Note that we want to do this after
1210: * initgroups, because at least on Solaris 2.3 it leaves file
1211: * descriptors open.
1212: */
1.258 djm 1213: closefrom(STDERR_FILENO + 1);
1.172 markus 1214: }
1215:
1.127 markus 1216: /*
1217: * Performs common processing for the child, such as setting up the
1218: * environment, closing extra file descriptors, setting the user and group
1219: * ids, and executing the command or shell.
1220: */
1.225 markus 1221: #define ARGV_MAX 10
1.127 markus 1222: void
1.292 djm 1223: do_child(struct ssh *ssh, Session *s, const char *command)
1.127 markus 1224: {
1225: extern char **environ;
1.314 djm 1226: char **env, *argv[ARGV_MAX], remote_id[512];
1.284 djm 1227: const char *shell, *shell0;
1.127 markus 1228: struct passwd *pw = s->pw;
1.239 djm 1229: int r = 0;
1.127 markus 1230:
1.314 djm 1231: sshpkt_fmt_connection_id(ssh, remote_id, sizeof(remote_id));
1232:
1.127 markus 1233: /* remove hostkey from the child's memory */
1234: destroy_sensitive_data();
1.312 djm 1235: ssh_packet_clear_keys(ssh);
1.127 markus 1236:
1.172 markus 1237: /* Force a password change */
1238: if (s->authctxt->force_pwchange) {
1239: do_setusercontext(pw);
1.292 djm 1240: child_close_fds(ssh);
1.172 markus 1241: do_pwchange(s);
1242: exit(1);
1243: }
1244:
1.127 markus 1245: /*
1246: * Login(1) does this as well, and it needs uid 0 for the "-h"
1247: * switch, so we let login(1) to this for us.
1248: */
1.284 djm 1249: do_nologin(pw);
1250: do_setusercontext(pw);
1.127 markus 1251:
1252: /*
1253: * Get the shell from the password data. An empty shell field is
1254: * legal, and means /bin/sh.
1255: */
1256: shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1.152 markus 1257:
1258: /*
1259: * Make sure $SHELL points to the shell from the password file,
1260: * even if shell is overridden from login.conf
1261: */
1.292 djm 1262: env = do_setup_env(ssh, s, shell);
1.152 markus 1263:
1.127 markus 1264: shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1265:
1.1 markus 1266: /*
1267: * Close the connection descriptors; note that this is the child, and
1268: * the server will still have the socket open, and it is important
1269: * that we do not shutdown it. Note that the descriptors cannot be
1270: * closed before building the environment, as we call
1.281 djm 1271: * ssh_remote_ipaddr there.
1.1 markus 1272: */
1.292 djm 1273: child_close_fds(ssh);
1.1 markus 1274:
1275: /*
1.125 deraadt 1276: * Must take new environment into use so that .ssh/rc,
1277: * /etc/ssh/sshrc and xauth are run in the proper environment.
1.1 markus 1278: */
1279: environ = env;
1.170 jakob 1280:
1281: #ifdef KRB5
1282: /*
1283: * At this point, we check to see if AFS is active and if we have
1284: * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1285: * if we can (and need to) extend the ticket into an AFS token. If
1286: * we don't do this, we run into potential problems if the user's
1287: * home directory is in AFS and it's not world-readable.
1288: */
1289:
1290: if (options.kerberos_get_afs_token && k_hasafs() &&
1.185 djm 1291: (s->authctxt->krb5_ctx != NULL)) {
1.170 jakob 1292: char cell[64];
1293:
1294: debug("Getting AFS token");
1295:
1296: k_setpag();
1297:
1298: if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1299: krb5_afslog(s->authctxt->krb5_ctx,
1300: s->authctxt->krb5_fwd_ccache, cell, NULL);
1301:
1302: krb5_afslog_home(s->authctxt->krb5_ctx,
1303: s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1304: }
1305: #endif
1.104 markus 1306:
1.188 djm 1307: /* Change current directory to the user's home directory. */
1.316 ! deraadt 1308: if (chdir(pw->pw_dir) == -1) {
1.239 djm 1309: /* Suppress missing homedir warning for chroot case */
1310: r = login_getcapbool(lc, "requirehome", 0);
1.279 djm 1311: if (r || !in_chroot) {
1.239 djm 1312: fprintf(stderr, "Could not chdir to home "
1313: "directory %s: %s\n", pw->pw_dir,
1314: strerror(errno));
1.279 djm 1315: }
1.239 djm 1316: if (r)
1.104 markus 1317: exit(1);
1318: }
1.230 djm 1319:
1320: closefrom(STDERR_FILENO + 1);
1.1 markus 1321:
1.294 djm 1322: do_rc_files(ssh, s, shell);
1.67 markus 1323:
1324: /* restore SIGPIPE for child */
1.217 stevesk 1325: signal(SIGPIPE, SIG_DFL);
1.67 markus 1326:
1.248 djm 1327: if (s->is_subsystem == SUBSYSTEM_INT_SFTP_ERROR) {
1.314 djm 1328: error("Connection from %s: refusing non-sftp session",
1329: remote_id);
1.248 djm 1330: printf("This service allows sftp connections only.\n");
1331: fflush(NULL);
1332: exit(1);
1333: } else if (s->is_subsystem == SUBSYSTEM_INT_SFTP) {
1.225 markus 1334: extern int optind, optreset;
1335: int i;
1336: char *p, *args;
1337:
1.246 stevesk 1338: setproctitle("%s@%s", s->pw->pw_name, INTERNAL_SFTP_NAME);
1.243 millert 1339: args = xstrdup(command ? command : "sftp-server");
1.225 markus 1340: for (i = 0, (p = strtok(args, " ")); p; (p = strtok(NULL, " ")))
1341: if (i < ARGV_MAX - 1)
1342: argv[i++] = p;
1343: argv[i] = NULL;
1344: optind = optreset = 1;
1345: __progname = argv[0];
1.226 djm 1346: exit(sftp_server_main(i, argv, s->pw));
1.225 markus 1347: }
1.247 djm 1348:
1349: fflush(NULL);
1.225 markus 1350:
1.127 markus 1351: /* Get the last component of the shell name. */
1352: if ((shell0 = strrchr(shell, '/')) != NULL)
1353: shell0++;
1354: else
1355: shell0 = shell;
1356:
1.1 markus 1357: /*
1358: * If we have no command, execute the shell. In this case, the shell
1359: * name to be passed in argv[0] is preceded by '-' to indicate that
1360: * this is a login shell.
1361: */
1362: if (!command) {
1.127 markus 1363: char argv0[256];
1.1 markus 1364:
1.127 markus 1365: /* Start the shell. Set initial character to '-'. */
1366: argv0[0] = '-';
1.1 markus 1367:
1.127 markus 1368: if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1.128 markus 1369: >= sizeof(argv0) - 1) {
1.127 markus 1370: errno = EINVAL;
1.1 markus 1371: perror(shell);
1372: exit(1);
1.127 markus 1373: }
1.1 markus 1374:
1.127 markus 1375: /* Execute the shell. */
1376: argv[0] = argv0;
1377: argv[1] = NULL;
1378: execve(shell, argv, env);
1379:
1380: /* Executing the shell failed. */
1381: perror(shell);
1382: exit(1);
1.1 markus 1383: }
1384: /*
1385: * Execute the command using the user's shell. This uses the -c
1386: * option to execute the command.
1387: */
1.127 markus 1388: argv[0] = (char *) shell0;
1.1 markus 1389: argv[1] = "-c";
1390: argv[2] = (char *) command;
1391: argv[3] = NULL;
1392: execve(shell, argv, env);
1393: perror(shell);
1394: exit(1);
1395: }
1396:
1.237 djm 1397: void
1398: session_unused(int id)
1399: {
1400: debug3("%s: session id %d unused", __func__, id);
1401: if (id >= options.max_sessions ||
1402: id >= sessions_nalloc) {
1403: fatal("%s: insane session id %d (max %d nalloc %d)",
1404: __func__, id, options.max_sessions, sessions_nalloc);
1405: }
1.270 tedu 1406: memset(&sessions[id], 0, sizeof(*sessions));
1.237 djm 1407: sessions[id].self = id;
1408: sessions[id].used = 0;
1409: sessions[id].chanid = -1;
1410: sessions[id].ptyfd = -1;
1411: sessions[id].ttyfd = -1;
1412: sessions[id].ptymaster = -1;
1413: sessions[id].x11_chanids = NULL;
1414: sessions[id].next_unused = sessions_first_unused;
1415: sessions_first_unused = id;
1416: }
1417:
1.1 markus 1418: Session *
1419: session_new(void)
1420: {
1.237 djm 1421: Session *s, *tmp;
1422:
1423: if (sessions_first_unused == -1) {
1424: if (sessions_nalloc >= options.max_sessions)
1425: return NULL;
1426: debug2("%s: allocate (allocated %d max %d)",
1427: __func__, sessions_nalloc, options.max_sessions);
1.288 deraadt 1428: tmp = xrecallocarray(sessions, sessions_nalloc,
1429: sessions_nalloc + 1, sizeof(*sessions));
1.237 djm 1430: if (tmp == NULL) {
1431: error("%s: cannot allocate %d sessions",
1432: __func__, sessions_nalloc + 1);
1433: return NULL;
1434: }
1435: sessions = tmp;
1436: session_unused(sessions_nalloc++);
1437: }
1438:
1439: if (sessions_first_unused >= sessions_nalloc ||
1440: sessions_first_unused < 0) {
1441: fatal("%s: insane first_unused %d max %d nalloc %d",
1442: __func__, sessions_first_unused, options.max_sessions,
1443: sessions_nalloc);
1444: }
1445:
1446: s = &sessions[sessions_first_unused];
1447: if (s->used) {
1448: fatal("%s: session %d already used",
1449: __func__, sessions_first_unused);
1450: }
1451: sessions_first_unused = s->next_unused;
1452: s->used = 1;
1453: s->next_unused = -1;
1454: debug("session_new: session %d", s->self);
1455:
1456: return s;
1.1 markus 1457: }
1458:
1.94 itojun 1459: static void
1.1 markus 1460: session_dump(void)
1461: {
1462: int i;
1.237 djm 1463: for (i = 0; i < sessions_nalloc; i++) {
1.1 markus 1464: Session *s = &sessions[i];
1.237 djm 1465:
1466: debug("dump: used %d next_unused %d session %d %p "
1467: "channel %d pid %ld",
1.1 markus 1468: s->used,
1.237 djm 1469: s->next_unused,
1.1 markus 1470: s->self,
1471: s,
1472: s->chanid,
1.137 mpech 1473: (long)s->pid);
1.1 markus 1474: }
1475: }
1476:
1.2 markus 1477: int
1.97 markus 1478: session_open(Authctxt *authctxt, int chanid)
1.2 markus 1479: {
1480: Session *s = session_new();
1481: debug("session_open: channel %d", chanid);
1482: if (s == NULL) {
1483: error("no more sessions");
1484: return 0;
1485: }
1.97 markus 1486: s->authctxt = authctxt;
1487: s->pw = authctxt->pw;
1.167 djm 1488: if (s->pw == NULL || !authctxt->valid)
1.54 stevesk 1489: fatal("no user for session %d", s->self);
1.2 markus 1490: debug("session_open: session %d: link with channel %d", s->self, chanid);
1491: s->chanid = chanid;
1492: return 1;
1493: }
1494:
1.130 provos 1495: Session *
1496: session_by_tty(char *tty)
1497: {
1498: int i;
1.237 djm 1499: for (i = 0; i < sessions_nalloc; i++) {
1.130 provos 1500: Session *s = &sessions[i];
1501: if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
1502: debug("session_by_tty: session %d tty %s", i, tty);
1503: return s;
1504: }
1505: }
1506: debug("session_by_tty: unknown tty %.100s", tty);
1507: session_dump();
1508: return NULL;
1509: }
1510:
1.94 itojun 1511: static Session *
1.2 markus 1512: session_by_channel(int id)
1513: {
1514: int i;
1.237 djm 1515: for (i = 0; i < sessions_nalloc; i++) {
1.2 markus 1516: Session *s = &sessions[i];
1517: if (s->used && s->chanid == id) {
1.237 djm 1518: debug("session_by_channel: session %d channel %d",
1519: i, id);
1.2 markus 1520: return s;
1521: }
1522: }
1523: debug("session_by_channel: unknown channel %d", id);
1524: session_dump();
1525: return NULL;
1526: }
1527:
1.94 itojun 1528: static Session *
1.184 djm 1529: session_by_x11_channel(int id)
1530: {
1531: int i, j;
1532:
1.237 djm 1533: for (i = 0; i < sessions_nalloc; i++) {
1.184 djm 1534: Session *s = &sessions[i];
1535:
1536: if (s->x11_chanids == NULL || !s->used)
1537: continue;
1538: for (j = 0; s->x11_chanids[j] != -1; j++) {
1539: if (s->x11_chanids[j] == id) {
1540: debug("session_by_x11_channel: session %d "
1541: "channel %d", s->self, id);
1542: return s;
1543: }
1544: }
1545: }
1546: debug("session_by_x11_channel: unknown channel %d", id);
1547: session_dump();
1548: return NULL;
1549: }
1550:
1551: static Session *
1.2 markus 1552: session_by_pid(pid_t pid)
1553: {
1554: int i;
1.137 mpech 1555: debug("session_by_pid: pid %ld", (long)pid);
1.237 djm 1556: for (i = 0; i < sessions_nalloc; i++) {
1.2 markus 1557: Session *s = &sessions[i];
1558: if (s->used && s->pid == pid)
1559: return s;
1560: }
1.137 mpech 1561: error("session_by_pid: unknown pid %ld", (long)pid);
1.2 markus 1562: session_dump();
1563: return NULL;
1564: }
1565:
1.94 itojun 1566: static int
1.292 djm 1567: session_window_change_req(struct ssh *ssh, Session *s)
1.2 markus 1568: {
1.312 djm 1569: int r;
1570:
1571: if ((r = sshpkt_get_u32(ssh, &s->col)) != 0 ||
1572: (r = sshpkt_get_u32(ssh, &s->row)) != 0 ||
1573: (r = sshpkt_get_u32(ssh, &s->xpixel)) != 0 ||
1574: (r = sshpkt_get_u32(ssh, &s->ypixel)) != 0 ||
1575: (r = sshpkt_get_end(ssh)) != 0)
1576: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.2 markus 1577: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1578: return 1;
1579: }
1580:
1.94 itojun 1581: static int
1.292 djm 1582: session_pty_req(struct ssh *ssh, Session *s)
1.2 markus 1583: {
1.312 djm 1584: int r;
1.132 markus 1585:
1.294 djm 1586: if (!auth_opts->permit_pty_flag || !options.permit_tty) {
1587: debug("Allocating a pty not permitted for this connection.");
1.19 markus 1588: return 0;
1.86 markus 1589: }
1590: if (s->ttyfd != -1) {
1.312 djm 1591: ssh_packet_disconnect(ssh, "Protocol error: you already have a pty.");
1.3 markus 1592: return 0;
1.86 markus 1593: }
1594:
1.312 djm 1595: if ((r = sshpkt_get_cstring(ssh, &s->term, NULL)) != 0 ||
1596: (r = sshpkt_get_u32(ssh, &s->col)) != 0 ||
1597: (r = sshpkt_get_u32(ssh, &s->row)) != 0 ||
1598: (r = sshpkt_get_u32(ssh, &s->xpixel)) != 0 ||
1599: (r = sshpkt_get_u32(ssh, &s->ypixel)) != 0)
1600: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.2 markus 1601:
1602: if (strcmp(s->term, "") == 0) {
1.265 djm 1603: free(s->term);
1.2 markus 1604: s->term = NULL;
1605: }
1.86 markus 1606:
1.2 markus 1607: /* Allocate a pty and open it. */
1.86 markus 1608: debug("Allocating pty.");
1.237 djm 1609: if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty,
1610: sizeof(s->tty)))) {
1.265 djm 1611: free(s->term);
1.2 markus 1612: s->term = NULL;
1613: s->ptyfd = -1;
1614: s->ttyfd = -1;
1615: error("session_pty_req: session %d alloc failed", s->self);
1.3 markus 1616: return 0;
1.2 markus 1617: }
1618: debug("session_pty_req: session %d alloc %s", s->self, s->tty);
1.86 markus 1619:
1.302 markus 1620: ssh_tty_parse_modes(ssh, s->ttyfd);
1.86 markus 1621:
1.312 djm 1622: if ((r = sshpkt_get_end(ssh)) != 0)
1623: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1624:
1.130 provos 1625: if (!use_privsep)
1626: pty_setowner(s->pw, s->tty);
1.86 markus 1627:
1628: /* Set window size from the packet. */
1.2 markus 1629: pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
1630:
1.9 markus 1631: session_proctitle(s);
1.2 markus 1632: return 1;
1633: }
1634:
1.94 itojun 1635: static int
1.292 djm 1636: session_subsystem_req(struct ssh *ssh, Session *s)
1.7 markus 1637: {
1.105 markus 1638: struct stat st;
1.312 djm 1639: int r, success = 0;
1.267 djm 1640: char *prog, *cmd;
1.182 djm 1641: u_int i;
1.7 markus 1642:
1.312 djm 1643: if ((r = sshpkt_get_cstring(ssh, &s->subsys, NULL)) != 0 ||
1644: (r = sshpkt_get_end(ssh)) != 0)
1645: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.267 djm 1646: debug2("subsystem request for %.100s by user %s", s->subsys,
1.255 djm 1647: s->pw->pw_name);
1.18 jakob 1648:
1649: for (i = 0; i < options.num_subsystems; i++) {
1.267 djm 1650: if (strcmp(s->subsys, options.subsystem_name[i]) == 0) {
1.205 djm 1651: prog = options.subsystem_command[i];
1652: cmd = options.subsystem_args[i];
1.249 dtucker 1653: if (strcmp(INTERNAL_SFTP_NAME, prog) == 0) {
1.225 markus 1654: s->is_subsystem = SUBSYSTEM_INT_SFTP;
1.249 dtucker 1655: debug("subsystem: %s", prog);
1.225 markus 1656: } else {
1.316 ! deraadt 1657: if (stat(prog, &st) == -1)
1.249 dtucker 1658: debug("subsystem: cannot stat %s: %s",
1659: prog, strerror(errno));
1.225 markus 1660: s->is_subsystem = SUBSYSTEM_EXT;
1.249 dtucker 1661: debug("subsystem: exec() %s", cmd);
1.105 markus 1662: }
1.292 djm 1663: success = do_exec(ssh, s, cmd) == 0;
1.122 markus 1664: break;
1.18 jakob 1665: }
1666: }
1667:
1668: if (!success)
1.267 djm 1669: logit("subsystem request for %.100s by user %s failed, "
1670: "subsystem not found", s->subsys, s->pw->pw_name);
1.7 markus 1671:
1672: return success;
1673: }
1674:
1.94 itojun 1675: static int
1.292 djm 1676: session_x11_req(struct ssh *ssh, Session *s)
1.7 markus 1677: {
1.312 djm 1678: int r, success;
1679: u_char single_connection = 0;
1.7 markus 1680:
1.184 djm 1681: if (s->auth_proto != NULL || s->auth_data != NULL) {
1682: error("session_x11_req: session %d: "
1.190 stevesk 1683: "x11 forwarding already active", s->self);
1.184 djm 1684: return 0;
1685: }
1.312 djm 1686: if ((r = sshpkt_get_u8(ssh, &single_connection)) != 0 ||
1687: (r = sshpkt_get_cstring(ssh, &s->auth_proto, NULL)) != 0 ||
1688: (r = sshpkt_get_cstring(ssh, &s->auth_data, NULL)) != 0 ||
1689: (r = sshpkt_get_u32(ssh, &s->screen)) != 0 ||
1690: (r = sshpkt_get_end(ssh)) != 0)
1691: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1692:
1693: s->single_connection = single_connection;
1.7 markus 1694:
1.282 djm 1695: if (xauth_valid_string(s->auth_proto) &&
1696: xauth_valid_string(s->auth_data))
1.292 djm 1697: success = session_setup_x11fwd(ssh, s);
1.282 djm 1698: else {
1699: success = 0;
1700: error("Invalid X11 forwarding data");
1701: }
1.81 markus 1702: if (!success) {
1.265 djm 1703: free(s->auth_proto);
1704: free(s->auth_data);
1.84 markus 1705: s->auth_proto = NULL;
1706: s->auth_data = NULL;
1.7 markus 1707: }
1.81 markus 1708: return success;
1.7 markus 1709: }
1710:
1.94 itojun 1711: static int
1.292 djm 1712: session_shell_req(struct ssh *ssh, Session *s)
1.19 markus 1713: {
1.312 djm 1714: int r;
1715:
1716: if ((r = sshpkt_get_end(ssh)) != 0)
1717: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.292 djm 1718: return do_exec(ssh, s, NULL) == 0;
1.19 markus 1719: }
1720:
1.94 itojun 1721: static int
1.292 djm 1722: session_exec_req(struct ssh *ssh, Session *s)
1.19 markus 1723: {
1.312 djm 1724: u_int success;
1725: int r;
1726: char *command = NULL;
1727:
1728: if ((r = sshpkt_get_cstring(ssh, &command, NULL)) != 0 ||
1729: (r = sshpkt_get_end(ssh)) != 0)
1730: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.237 djm 1731:
1.292 djm 1732: success = do_exec(ssh, s, command) == 0;
1.265 djm 1733: free(command);
1.237 djm 1734: return success;
1.19 markus 1735: }
1736:
1.94 itojun 1737: static int
1.292 djm 1738: session_break_req(struct ssh *ssh, Session *s)
1.157 markus 1739: {
1.312 djm 1740: int r;
1.157 markus 1741:
1.312 djm 1742: if ((r = sshpkt_get_u32(ssh, NULL)) != 0 || /* ignore */
1743: (r = sshpkt_get_end(ssh)) != 0)
1744: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.157 markus 1745:
1.316 ! deraadt 1746: if (s->ptymaster == -1 || tcsendbreak(s->ptymaster, 0) == -1)
1.157 markus 1747: return 0;
1748: return 1;
1749: }
1750:
1751: static int
1.292 djm 1752: session_env_req(struct ssh *ssh, Session *s)
1.173 djm 1753: {
1754: char *name, *val;
1.312 djm 1755: u_int i;
1756: int r;
1.173 djm 1757:
1.312 djm 1758: if ((r = sshpkt_get_cstring(ssh, &name, NULL)) != 0 ||
1759: (r = sshpkt_get_cstring(ssh, &val, NULL)) != 0 ||
1760: (r = sshpkt_get_end(ssh)) != 0)
1761: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.173 djm 1762:
1763: /* Don't set too many environment variables */
1764: if (s->num_env > 128) {
1765: debug2("Ignoring env request %s: too many env vars", name);
1766: goto fail;
1767: }
1768:
1769: for (i = 0; i < options.num_accept_env; i++) {
1770: if (match_pattern(name, options.accept_env[i])) {
1771: debug2("Setting env %d: %s=%s", s->num_env, name, val);
1.288 deraadt 1772: s->env = xrecallocarray(s->env, s->num_env,
1773: s->num_env + 1, sizeof(*s->env));
1.173 djm 1774: s->env[s->num_env].name = name;
1775: s->env[s->num_env].val = val;
1776: s->num_env++;
1777: return (1);
1778: }
1779: }
1780: debug2("Ignoring env request %s: disallowed name", name);
1781:
1782: fail:
1.265 djm 1783: free(name);
1784: free(val);
1.173 djm 1785: return (0);
1786: }
1787:
1.306 djm 1788: /*
1789: * Conversion of signals from ssh channel request names.
1790: * Subset of signals from RFC 4254 section 6.10C, with SIGINFO as
1791: * local extension.
1792: */
1793: static int
1794: name2sig(char *name)
1795: {
1796: #define SSH_SIG(x) if (strcmp(name, #x) == 0) return SIG ## x
1797: SSH_SIG(HUP);
1798: SSH_SIG(INT);
1799: SSH_SIG(KILL);
1800: SSH_SIG(QUIT);
1801: SSH_SIG(TERM);
1802: SSH_SIG(USR1);
1803: SSH_SIG(USR2);
1804: #undef SSH_SIG
1805: if (strcmp(name, "INFO@openssh.com") == 0)
1806: return SIGINFO;
1807: return -1;
1808: }
1809:
1810: static int
1811: session_signal_req(struct ssh *ssh, Session *s)
1812: {
1813: char *signame = NULL;
1814: int r, sig, success = 0;
1815:
1816: if ((r = sshpkt_get_cstring(ssh, &signame, NULL)) != 0 ||
1817: (r = sshpkt_get_end(ssh)) != 0) {
1818: error("%s: parse packet: %s", __func__, ssh_err(r));
1819: goto out;
1820: }
1821: if ((sig = name2sig(signame)) == -1) {
1822: error("%s: unsupported signal \"%s\"", __func__, signame);
1823: goto out;
1824: }
1825: if (s->pid <= 0) {
1826: error("%s: no pid for session %d", __func__, s->self);
1827: goto out;
1828: }
1829: if (s->forced || s->is_subsystem) {
1830: error("%s: refusing to send signal %s to %s session", __func__,
1831: signame, s->forced ? "forced-command" : "subsystem");
1832: goto out;
1833: }
1834: if (!use_privsep || mm_is_monitor()) {
1835: error("%s: session signalling requires privilege separation",
1836: __func__);
1837: goto out;
1838: }
1839:
1840: debug("%s: signal %s, killpg(%ld, %d)", __func__, signame,
1841: (long)s->pid, sig);
1842: temporarily_use_uid(s->pw);
1843: r = killpg(s->pid, sig);
1844: restore_uid();
1845: if (r != 0) {
1846: error("%s: killpg(%ld, %d): %s", __func__, (long)s->pid,
1847: sig, strerror(errno));
1848: goto out;
1849: }
1850:
1851: /* success */
1852: success = 1;
1853: out:
1854: free(signame);
1855: return success;
1856: }
1857:
1.173 djm 1858: static int
1.292 djm 1859: session_auth_agent_req(struct ssh *ssh, Session *s)
1.43 markus 1860: {
1861: static int called = 0;
1.312 djm 1862: int r;
1.294 djm 1863:
1.312 djm 1864: if ((r = sshpkt_get_end(ssh)) != 0)
1865: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.294 djm 1866: if (!auth_opts->permit_agent_forwarding_flag ||
1867: !options.allow_agent_forwarding) {
1868: debug("%s: agent forwarding disabled", __func__);
1.44 markus 1869: return 0;
1870: }
1.43 markus 1871: if (called) {
1872: return 0;
1873: } else {
1874: called = 1;
1.292 djm 1875: return auth_input_request_forwarding(ssh, s->pw);
1.43 markus 1876: }
1877: }
1878:
1.123 markus 1879: int
1.292 djm 1880: session_input_channel_req(struct ssh *ssh, Channel *c, const char *rtype)
1.2 markus 1881: {
1882: int success = 0;
1883: Session *s;
1884:
1.123 markus 1885: if ((s = session_by_channel(c->self)) == NULL) {
1.292 djm 1886: logit("%s: no session %d req %.100s", __func__, c->self, rtype);
1.123 markus 1887: return 0;
1888: }
1.292 djm 1889: debug("%s: session %d req %s", __func__, s->self, rtype);
1.2 markus 1890:
1891: /*
1.64 markus 1892: * a session is in LARVAL state until a shell, a command
1893: * or a subsystem is executed
1.2 markus 1894: */
1895: if (c->type == SSH_CHANNEL_LARVAL) {
1896: if (strcmp(rtype, "shell") == 0) {
1.292 djm 1897: success = session_shell_req(ssh, s);
1.2 markus 1898: } else if (strcmp(rtype, "exec") == 0) {
1.292 djm 1899: success = session_exec_req(ssh, s);
1.2 markus 1900: } else if (strcmp(rtype, "pty-req") == 0) {
1.292 djm 1901: success = session_pty_req(ssh, s);
1.7 markus 1902: } else if (strcmp(rtype, "x11-req") == 0) {
1.292 djm 1903: success = session_x11_req(ssh, s);
1.43 markus 1904: } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1.292 djm 1905: success = session_auth_agent_req(ssh, s);
1.7 markus 1906: } else if (strcmp(rtype, "subsystem") == 0) {
1.292 djm 1907: success = session_subsystem_req(ssh, s);
1.173 djm 1908: } else if (strcmp(rtype, "env") == 0) {
1.292 djm 1909: success = session_env_req(ssh, s);
1.2 markus 1910: }
1911: }
1912: if (strcmp(rtype, "window-change") == 0) {
1.292 djm 1913: success = session_window_change_req(ssh, s);
1.177 djm 1914: } else if (strcmp(rtype, "break") == 0) {
1.292 djm 1915: success = session_break_req(ssh, s);
1.306 djm 1916: } else if (strcmp(rtype, "signal") == 0) {
1917: success = session_signal_req(ssh, s);
1.2 markus 1918: }
1.177 djm 1919:
1.123 markus 1920: return success;
1.2 markus 1921: }
1922:
1923: void
1.292 djm 1924: session_set_fds(struct ssh *ssh, Session *s,
1925: int fdin, int fdout, int fderr, int ignore_fderr, int is_tty)
1.2 markus 1926: {
1927: /*
1928: * now that have a child and a pipe to the child,
1929: * we can activate our channel and register the fd's
1930: */
1931: if (s->chanid == -1)
1932: fatal("no channel for session %d", s->self);
1.292 djm 1933: channel_set_fds(ssh, s->chanid,
1.2 markus 1934: fdout, fdin, fderr,
1.256 djm 1935: ignore_fderr ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1.241 dtucker 1936: 1, is_tty, CHAN_SES_WINDOW_DEFAULT);
1.2 markus 1937: }
1938:
1.85 markus 1939: /*
1940: * Function to perform pty cleanup. Also called if we get aborted abnormally
1941: * (e.g., due to a dropped connection).
1942: */
1.130 provos 1943: void
1.165 markus 1944: session_pty_cleanup2(Session *s)
1.1 markus 1945: {
1.85 markus 1946: if (s == NULL) {
1.307 djm 1947: error("%s: no session", __func__);
1.85 markus 1948: return;
1949: }
1950: if (s->ttyfd == -1)
1.1 markus 1951: return;
1952:
1.307 djm 1953: debug("%s: session %d release %s", __func__, s->self, s->tty);
1.1 markus 1954:
1955: /* Record that the user has logged out. */
1.85 markus 1956: if (s->pid != 0)
1957: record_logout(s->pid, s->tty);
1.1 markus 1958:
1959: /* Release the pseudo-tty. */
1.130 provos 1960: if (getuid() == 0)
1961: pty_release(s->tty);
1.1 markus 1962:
1963: /*
1964: * Close the server side of the socket pairs. We must do this after
1965: * the pty cleanup, so that another process doesn't get this pty
1966: * while we're still cleaning up.
1967: */
1.316 ! deraadt 1968: if (s->ptymaster != -1 && close(s->ptymaster) == -1)
1.237 djm 1969: error("close(s->ptymaster/%d): %s",
1970: s->ptymaster, strerror(errno));
1.108 markus 1971:
1972: /* unlink pty from session */
1973: s->ttyfd = -1;
1.2 markus 1974: }
1975:
1.130 provos 1976: void
1.165 markus 1977: session_pty_cleanup(Session *s)
1.130 provos 1978: {
1.165 markus 1979: PRIVSEP(session_pty_cleanup2(s));
1.130 provos 1980: }
1981:
1.147 markus 1982: static char *
1983: sig2name(int sig)
1984: {
1985: #define SSH_SIG(x) if (sig == SIG ## x) return #x
1986: SSH_SIG(ABRT);
1987: SSH_SIG(ALRM);
1988: SSH_SIG(FPE);
1989: SSH_SIG(HUP);
1990: SSH_SIG(ILL);
1991: SSH_SIG(INT);
1992: SSH_SIG(KILL);
1993: SSH_SIG(PIPE);
1994: SSH_SIG(QUIT);
1995: SSH_SIG(SEGV);
1996: SSH_SIG(TERM);
1997: SSH_SIG(USR1);
1998: SSH_SIG(USR2);
1999: #undef SSH_SIG
2000: return "SIG@openssh.com";
2001: }
2002:
1.94 itojun 2003: static void
1.292 djm 2004: session_close_x11(struct ssh *ssh, int id)
1.184 djm 2005: {
2006: Channel *c;
2007:
1.292 djm 2008: if ((c = channel_by_id(ssh, id)) == NULL) {
2009: debug("%s: x11 channel %d missing", __func__, id);
1.184 djm 2010: } else {
2011: /* Detach X11 listener */
1.292 djm 2012: debug("%s: detach x11 channel %d", __func__, id);
2013: channel_cancel_cleanup(ssh, id);
1.184 djm 2014: if (c->ostate != CHAN_OUTPUT_CLOSED)
1.292 djm 2015: chan_mark_dead(ssh, c);
1.184 djm 2016: }
2017: }
2018:
2019: static void
1.292 djm 2020: session_close_single_x11(struct ssh *ssh, int id, void *arg)
1.184 djm 2021: {
2022: Session *s;
2023: u_int i;
2024:
1.292 djm 2025: debug3("%s: channel %d", __func__, id);
2026: channel_cancel_cleanup(ssh, id);
1.221 stevesk 2027: if ((s = session_by_x11_channel(id)) == NULL)
1.292 djm 2028: fatal("%s: no x11 channel %d", __func__, id);
1.184 djm 2029: for (i = 0; s->x11_chanids[i] != -1; i++) {
1.292 djm 2030: debug("%s: session %d: closing channel %d",
2031: __func__, s->self, s->x11_chanids[i]);
1.184 djm 2032: /*
2033: * The channel "id" is already closing, but make sure we
2034: * close all of its siblings.
2035: */
2036: if (s->x11_chanids[i] != id)
1.292 djm 2037: session_close_x11(ssh, s->x11_chanids[i]);
1.184 djm 2038: }
1.265 djm 2039: free(s->x11_chanids);
1.184 djm 2040: s->x11_chanids = NULL;
1.265 djm 2041: free(s->display);
2042: s->display = NULL;
2043: free(s->auth_proto);
2044: s->auth_proto = NULL;
2045: free(s->auth_data);
2046: s->auth_data = NULL;
2047: free(s->auth_display);
2048: s->auth_display = NULL;
1.184 djm 2049: }
2050:
2051: static void
1.292 djm 2052: session_exit_message(struct ssh *ssh, Session *s, int status)
1.2 markus 2053: {
2054: Channel *c;
1.312 djm 2055: int r;
1.124 markus 2056:
1.292 djm 2057: if ((c = channel_lookup(ssh, s->chanid)) == NULL)
2058: fatal("%s: session %d: no channel %d",
2059: __func__, s->self, s->chanid);
2060: debug("%s: session %d channel %d pid %ld",
2061: __func__, s->self, s->chanid, (long)s->pid);
1.2 markus 2062:
2063: if (WIFEXITED(status)) {
1.292 djm 2064: channel_request_start(ssh, s->chanid, "exit-status", 0);
1.312 djm 2065: if ((r = sshpkt_put_u32(ssh, WEXITSTATUS(status))) != 0 ||
2066: (r = sshpkt_send(ssh)) != 0)
2067: sshpkt_fatal(ssh, r, "%s: exit reply", __func__);
1.2 markus 2068: } else if (WIFSIGNALED(status)) {
1.292 djm 2069: channel_request_start(ssh, s->chanid, "exit-signal", 0);
1.312 djm 2070: if ((r = sshpkt_put_cstring(ssh, sig2name(WTERMSIG(status)))) != 0 ||
2071: (r = sshpkt_put_u8(ssh, WCOREDUMP(status)? 1 : 0)) != 0 ||
2072: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
2073: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
2074: (r = sshpkt_send(ssh)) != 0)
2075: sshpkt_fatal(ssh, r, "%s: exit reply", __func__);
1.2 markus 2076: } else {
2077: /* Some weird exit cause. Just exit. */
1.312 djm 2078: ssh_packet_disconnect(ssh, "wait returned status %04x.", status);
1.2 markus 2079: }
2080:
2081: /* disconnect channel */
1.292 djm 2082: debug("%s: release channel %d", __func__, s->chanid);
1.187 djm 2083:
2084: /*
2085: * Adjust cleanup callback attachment to send close messages when
1.199 deraadt 2086: * the channel gets EOF. The session will be then be closed
1.187 djm 2087: * by session_close_by_channel when the childs close their fds.
2088: */
1.292 djm 2089: channel_register_cleanup(ssh, c->self, session_close_by_channel, 1);
1.187 djm 2090:
1.5 markus 2091: /*
2092: * emulate a write failure with 'chan_write_failed', nobody will be
2093: * interested in data we write.
2094: * Note that we must not call 'chan_read_failed', since there could
2095: * be some more data waiting in the pipe.
2096: */
1.8 markus 2097: if (c->ostate != CHAN_OUTPUT_CLOSED)
1.292 djm 2098: chan_write_failed(ssh, c);
1.2 markus 2099: }
2100:
1.130 provos 2101: void
1.292 djm 2102: session_close(struct ssh *ssh, Session *s)
1.2 markus 2103: {
1.182 djm 2104: u_int i;
1.173 djm 2105:
1.280 djm 2106: verbose("Close session: user %s from %.200s port %d id %d",
2107: s->pw->pw_name,
1.281 djm 2108: ssh_remote_ipaddr(ssh),
2109: ssh_remote_port(ssh),
1.280 djm 2110: s->self);
2111:
1.165 markus 2112: if (s->ttyfd != -1)
1.85 markus 2113: session_pty_cleanup(s);
1.265 djm 2114: free(s->term);
2115: free(s->display);
2116: free(s->x11_chanids);
2117: free(s->auth_display);
2118: free(s->auth_data);
2119: free(s->auth_proto);
1.267 djm 2120: free(s->subsys);
1.219 djm 2121: if (s->env != NULL) {
2122: for (i = 0; i < s->num_env; i++) {
1.265 djm 2123: free(s->env[i].name);
2124: free(s->env[i].val);
1.219 djm 2125: }
1.265 djm 2126: free(s->env);
1.173 djm 2127: }
1.9 markus 2128: session_proctitle(s);
1.237 djm 2129: session_unused(s->self);
1.2 markus 2130: }
2131:
2132: void
1.292 djm 2133: session_close_by_pid(struct ssh *ssh, pid_t pid, int status)
1.2 markus 2134: {
2135: Session *s = session_by_pid(pid);
2136: if (s == NULL) {
1.292 djm 2137: debug("%s: no session for pid %ld", __func__, (long)pid);
1.2 markus 2138: return;
2139: }
2140: if (s->chanid != -1)
1.292 djm 2141: session_exit_message(ssh, s, status);
1.187 djm 2142: if (s->ttyfd != -1)
2143: session_pty_cleanup(s);
1.197 djm 2144: s->pid = 0;
1.98 markus 2145: }
2146:
1.2 markus 2147: /*
2148: * this is called when a channel dies before
2149: * the session 'child' itself dies
2150: */
2151: void
1.292 djm 2152: session_close_by_channel(struct ssh *ssh, int id, void *arg)
1.2 markus 2153: {
2154: Session *s = session_by_channel(id);
1.187 djm 2155: u_int i;
1.184 djm 2156:
1.2 markus 2157: if (s == NULL) {
1.292 djm 2158: debug("%s: no session for id %d", __func__, id);
1.2 markus 2159: return;
2160: }
1.292 djm 2161: debug("%s: channel %d child %ld", __func__, id, (long)s->pid);
1.107 markus 2162: if (s->pid != 0) {
1.307 djm 2163: debug("%s: channel %d: has child, ttyfd %d",
2164: __func__, id, s->ttyfd);
1.108 markus 2165: /*
2166: * delay detach of session, but release pty, since
2167: * the fd's to the child are already closed
2168: */
1.165 markus 2169: if (s->ttyfd != -1)
1.108 markus 2170: session_pty_cleanup(s);
1.107 markus 2171: return;
2172: }
2173: /* detach by removing callback */
1.292 djm 2174: channel_cancel_cleanup(ssh, s->chanid);
1.187 djm 2175:
2176: /* Close any X11 listeners associated with this session */
2177: if (s->x11_chanids != NULL) {
2178: for (i = 0; s->x11_chanids[i] != -1; i++) {
1.292 djm 2179: session_close_x11(ssh, s->x11_chanids[i]);
1.187 djm 2180: s->x11_chanids[i] = -1;
2181: }
2182: }
2183:
1.2 markus 2184: s->chanid = -1;
1.292 djm 2185: session_close(ssh, s);
1.106 markus 2186: }
2187:
2188: void
1.292 djm 2189: session_destroy_all(struct ssh *ssh, void (*closefunc)(Session *))
1.106 markus 2190: {
2191: int i;
1.237 djm 2192: for (i = 0; i < sessions_nalloc; i++) {
1.106 markus 2193: Session *s = &sessions[i];
1.130 provos 2194: if (s->used) {
2195: if (closefunc != NULL)
2196: closefunc(s);
2197: else
1.292 djm 2198: session_close(ssh, s);
1.130 provos 2199: }
1.2 markus 2200: }
1.9 markus 2201: }
2202:
1.94 itojun 2203: static char *
1.9 markus 2204: session_tty_list(void)
2205: {
2206: static char buf[1024];
2207: int i;
2208: buf[0] = '\0';
1.237 djm 2209: for (i = 0; i < sessions_nalloc; i++) {
1.9 markus 2210: Session *s = &sessions[i];
2211: if (s->used && s->ttyfd != -1) {
2212: if (buf[0] != '\0')
2213: strlcat(buf, ",", sizeof buf);
2214: strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
2215: }
2216: }
2217: if (buf[0] == '\0')
2218: strlcpy(buf, "notty", sizeof buf);
2219: return buf;
2220: }
2221:
2222: void
2223: session_proctitle(Session *s)
2224: {
2225: if (s->pw == NULL)
2226: error("no user for session %d", s->self);
2227: else
2228: setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1.81 markus 2229: }
2230:
2231: int
1.292 djm 2232: session_setup_x11fwd(struct ssh *ssh, Session *s)
1.81 markus 2233: {
2234: struct stat st;
1.109 stevesk 2235: char display[512], auth_display[512];
1.272 djm 2236: char hostname[NI_MAXHOST];
1.184 djm 2237: u_int i;
1.81 markus 2238:
1.294 djm 2239: if (!auth_opts->permit_x11_forwarding_flag) {
1.312 djm 2240: ssh_packet_send_debug(ssh, "X11 forwarding disabled by key options.");
1.81 markus 2241: return 0;
2242: }
2243: if (!options.x11_forwarding) {
2244: debug("X11 forwarding disabled in server configuration file.");
2245: return 0;
2246: }
1.275 djm 2247: if (options.xauth_location == NULL ||
1.81 markus 2248: (stat(options.xauth_location, &st) == -1)) {
1.312 djm 2249: ssh_packet_send_debug(ssh, "No xauth program; cannot forward X11.");
1.81 markus 2250: return 0;
2251: }
1.87 markus 2252: if (s->display != NULL) {
1.81 markus 2253: debug("X11 display already set.");
2254: return 0;
2255: }
1.292 djm 2256: if (x11_create_display_inet(ssh, options.x11_display_offset,
1.140 deraadt 2257: options.x11_use_localhost, s->single_connection,
1.184 djm 2258: &s->display_number, &s->x11_chanids) == -1) {
1.87 markus 2259: debug("x11_create_display_inet failed.");
1.81 markus 2260: return 0;
1.184 djm 2261: }
2262: for (i = 0; s->x11_chanids[i] != -1; i++) {
1.292 djm 2263: channel_register_cleanup(ssh, s->x11_chanids[i],
1.187 djm 2264: session_close_single_x11, 0);
1.81 markus 2265: }
1.109 stevesk 2266:
2267: /* Set up a suitable value for the DISPLAY variable. */
1.316 ! deraadt 2268: if (gethostname(hostname, sizeof(hostname)) == -1)
1.109 stevesk 2269: fatal("gethostname: %.100s", strerror(errno));
2270: /*
2271: * auth_display must be used as the displayname when the
2272: * authorization entry is added with xauth(1). This will be
2273: * different than the DISPLAY string for localhost displays.
2274: */
1.119 stevesk 2275: if (options.x11_use_localhost) {
1.140 deraadt 2276: snprintf(display, sizeof display, "localhost:%u.%u",
1.109 stevesk 2277: s->display_number, s->screen);
1.140 deraadt 2278: snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
1.118 stevesk 2279: s->display_number, s->screen);
1.109 stevesk 2280: s->display = xstrdup(display);
1.118 stevesk 2281: s->auth_display = xstrdup(auth_display);
1.109 stevesk 2282: } else {
1.140 deraadt 2283: snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
1.109 stevesk 2284: s->display_number, s->screen);
2285: s->display = xstrdup(display);
1.118 stevesk 2286: s->auth_display = xstrdup(display);
1.109 stevesk 2287: }
2288:
1.81 markus 2289: return 1;
1.2 markus 2290: }
2291:
1.94 itojun 2292: static void
1.292 djm 2293: do_authenticated2(struct ssh *ssh, Authctxt *authctxt)
1.2 markus 2294: {
1.292 djm 2295: server_loop2(ssh, authctxt);
1.165 markus 2296: }
2297:
2298: void
1.292 djm 2299: do_cleanup(struct ssh *ssh, Authctxt *authctxt)
1.165 markus 2300: {
2301: static int called = 0;
2302:
2303: debug("do_cleanup");
2304:
2305: /* no cleanup if we're in the child for login shell */
2306: if (is_child)
2307: return;
2308:
2309: /* avoid double cleanup */
2310: if (called)
2311: return;
2312: called = 1;
2313:
1.218 markus 2314: if (authctxt == NULL || !authctxt->authenticated)
1.165 markus 2315: return;
2316: #ifdef KRB5
2317: if (options.kerberos_ticket_cleanup &&
2318: authctxt->krb5_ctx)
2319: krb5_cleanup_proc(authctxt);
1.161 markus 2320: #endif
1.165 markus 2321:
2322: #ifdef GSSAPI
1.283 markus 2323: if (options.gss_cleanup_creds)
1.165 markus 2324: ssh_gssapi_cleanup_creds();
2325: #endif
2326:
2327: /* remove agent socket */
2328: auth_sock_cleanup_proc(authctxt->pw);
1.290 djm 2329:
2330: /* remove userauth info */
2331: if (auth_info_file != NULL) {
2332: temporarily_use_uid(authctxt->pw);
2333: unlink(auth_info_file);
2334: restore_uid();
2335: free(auth_info_file);
2336: auth_info_file = NULL;
2337: }
1.165 markus 2338:
2339: /*
2340: * Cleanup ptys/utmp only if privsep is disabled,
2341: * or if running in monitor.
2342: */
2343: if (!use_privsep || mm_is_monitor())
1.292 djm 2344: session_destroy_all(ssh, session_pty_cleanup2);
1.1 markus 2345: }
1.281 djm 2346:
2347: /* Return a name for the remote host that fits inside utmp_size */
2348:
2349: const char *
2350: session_get_remote_name_or_ip(struct ssh *ssh, u_int utmp_size, int use_dns)
2351: {
2352: const char *remote = "";
2353:
2354: if (utmp_size > 0)
2355: remote = auth_get_canonical_hostname(ssh, use_dns);
2356: if (utmp_size == 0 || strlen(remote) > utmp_size)
2357: remote = ssh_remote_ipaddr(ssh);
2358: return remote;
2359: }
2360:
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