Annotation of src/usr.bin/ssh/session.c, Revision 1.330
1.330 ! dtucker 1: /* $OpenBSD: session.c,v 1.329 2021/08/11 05:20:17 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>
1.317 deraadt 55: #include <stdarg.h>
1.211 stevesk 56: #include <unistd.h>
1.277 deraadt 57: #include <limits.h>
1.1 markus 58:
1.216 deraadt 59: #include "xmalloc.h"
1.51 markus 60: #include "ssh.h"
61: #include "ssh2.h"
1.59 djm 62: #include "sshpty.h"
1.1 markus 63: #include "packet.h"
1.303 markus 64: #include "sshbuf.h"
65: #include "ssherr.h"
1.173 djm 66: #include "match.h"
1.1 markus 67: #include "uidswap.h"
68: #include "compat.h"
1.78 markus 69: #include "channels.h"
1.304 markus 70: #include "sshkey.h"
1.216 deraadt 71: #include "cipher.h"
72: #include "kex.h"
73: #include "hostfile.h"
1.2 markus 74: #include "auth.h"
1.19 markus 75: #include "auth-options.h"
1.266 markus 76: #include "authfd.h"
1.50 markus 77: #include "pathnames.h"
1.51 markus 78: #include "log.h"
1.274 millert 79: #include "misc.h"
1.51 markus 80: #include "servconf.h"
1.59 djm 81: #include "sshlogin.h"
1.51 markus 82: #include "serverloop.h"
83: #include "canohost.h"
1.55 itojun 84: #include "session.h"
1.216 deraadt 85: #ifdef GSSAPI
86: #include "ssh-gss.h"
87: #endif
1.130 provos 88: #include "monitor_wrap.h"
1.225 markus 89: #include "sftp.h"
1.290 djm 90: #include "atomicio.h"
1.171 markus 91:
92: #ifdef KRB5
93: #include <kafs.h>
1.161 markus 94: #endif
1.310 djm 95:
1.242 djm 96: #define IS_INTERNAL_SFTP(c) \
97: (!strncmp(c, INTERNAL_SFTP_NAME, sizeof(INTERNAL_SFTP_NAME) - 1) && \
98: (c[sizeof(INTERNAL_SFTP_NAME) - 1] == '\0' || \
99: c[sizeof(INTERNAL_SFTP_NAME) - 1] == ' ' || \
100: c[sizeof(INTERNAL_SFTP_NAME) - 1] == '\t'))
101:
1.1 markus 102: /* func */
103:
104: Session *session_new(void);
1.292 djm 105: void session_set_fds(struct ssh *, Session *, int, int, int, int, int);
1.165 markus 106: void session_pty_cleanup(Session *);
1.94 itojun 107: void session_proctitle(Session *);
1.292 djm 108: int session_setup_x11fwd(struct ssh *, Session *);
109: int do_exec_pty(struct ssh *, Session *, const char *);
110: int do_exec_no_pty(struct ssh *, Session *, const char *);
111: int do_exec(struct ssh *, Session *, const char *);
112: void do_login(struct ssh *, Session *, const char *);
113: void do_child(struct ssh *, Session *, const char *);
1.73 djm 114: void do_motd(void);
1.94 itojun 115: int check_quietlogin(Session *, const char *);
1.1 markus 116:
1.292 djm 117: static void do_authenticated2(struct ssh *, Authctxt *);
1.94 itojun 118:
1.292 djm 119: static int session_pty_req(struct ssh *, Session *);
1.65 markus 120:
1.1 markus 121: /* import */
122: extern ServerOptions options;
123: extern char *__progname;
124: extern int debug_flag;
1.45 markus 125: extern u_int utmp_len;
1.21 markus 126: extern int startup_pipe;
1.74 markus 127: extern void destroy_sensitive_data(void);
1.303 markus 128: extern struct sshbuf *loginmsg;
1.294 djm 129: extern struct sshauthopt *auth_opts;
1.309 djm 130: extern char *tun_fwd_ifnames; /* serverloop.c */
1.21 markus 131:
1.34 markus 132: /* original command from peer. */
1.92 markus 133: const char *original_command = NULL;
1.34 markus 134:
1.1 markus 135: /* data */
1.237 djm 136: static int sessions_first_unused = -1;
137: static int sessions_nalloc = 0;
138: static Session *sessions = NULL;
1.1 markus 139:
1.248 djm 140: #define SUBSYSTEM_NONE 0
141: #define SUBSYSTEM_EXT 1
142: #define SUBSYSTEM_INT_SFTP 2
143: #define SUBSYSTEM_INT_SFTP_ERROR 3
1.225 markus 144:
1.129 provos 145: login_cap_t *lc;
1.28 millert 146:
1.165 markus 147: static int is_child = 0;
1.279 djm 148: static int in_chroot = 0;
1.165 markus 149:
1.290 djm 150: /* File containing userauth info, if ExposeAuthInfo set */
151: static char *auth_info_file = NULL;
152:
1.136 markus 153: /* Name and directory of socket for authentication agent forwarding. */
154: static char *auth_sock_name = NULL;
155: static char *auth_sock_dir = NULL;
156:
157: /* removes the agent forwarding socket */
158:
159: static void
1.165 markus 160: auth_sock_cleanup_proc(struct passwd *pw)
1.136 markus 161: {
162: if (auth_sock_name != NULL) {
163: temporarily_use_uid(pw);
164: unlink(auth_sock_name);
165: rmdir(auth_sock_dir);
166: auth_sock_name = NULL;
167: restore_uid();
168: }
169: }
170:
171: static int
1.292 djm 172: auth_input_request_forwarding(struct ssh *ssh, struct passwd * pw)
1.136 markus 173: {
174: Channel *nc;
1.237 djm 175: int sock = -1;
1.136 markus 176:
177: if (auth_sock_name != NULL) {
178: error("authentication forwarding requested twice.");
179: return 0;
180: }
181:
182: /* Temporarily drop privileged uid for mkdir/bind. */
183: temporarily_use_uid(pw);
184:
185: /* Allocate a buffer for the socket name, and format the name. */
1.237 djm 186: auth_sock_dir = xstrdup("/tmp/ssh-XXXXXXXXXX");
1.136 markus 187:
188: /* Create private directory for socket */
189: if (mkdtemp(auth_sock_dir) == NULL) {
1.312 djm 190: ssh_packet_send_debug(ssh, "Agent forwarding disabled: "
1.136 markus 191: "mkdtemp() failed: %.100s", strerror(errno));
192: restore_uid();
1.265 djm 193: free(auth_sock_dir);
1.136 markus 194: auth_sock_dir = NULL;
1.237 djm 195: goto authsock_err;
1.136 markus 196: }
1.237 djm 197:
198: xasprintf(&auth_sock_name, "%s/agent.%ld",
199: auth_sock_dir, (long) getpid());
1.136 markus 200:
1.274 millert 201: /* Start a Unix listener on auth_sock_name. */
202: sock = unix_listener(auth_sock_name, SSH_LISTEN_BACKLOG, 0);
1.136 markus 203:
204: /* Restore the privileged uid. */
205: restore_uid();
206:
1.274 millert 207: /* Check for socket/bind/listen failure. */
208: if (sock < 0)
1.237 djm 209: goto authsock_err;
1.136 markus 210:
211: /* Allocate a channel for the authentication agent socket. */
1.292 djm 212: nc = channel_new(ssh, "auth socket",
1.136 markus 213: SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
214: CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
1.156 markus 215: 0, "auth socket", 1);
1.245 djm 216: nc->path = xstrdup(auth_sock_name);
1.136 markus 217: return 1;
1.237 djm 218:
219: authsock_err:
1.265 djm 220: free(auth_sock_name);
1.237 djm 221: if (auth_sock_dir != NULL) {
1.315 djm 222: temporarily_use_uid(pw);
1.237 djm 223: rmdir(auth_sock_dir);
1.315 djm 224: restore_uid();
1.265 djm 225: free(auth_sock_dir);
1.237 djm 226: }
227: if (sock != -1)
228: close(sock);
229: auth_sock_name = NULL;
230: auth_sock_dir = NULL;
231: return 0;
1.136 markus 232: }
233:
1.179 dtucker 234: static void
235: display_loginmsg(void)
236: {
1.303 markus 237: int r;
238:
239: if (sshbuf_len(loginmsg) == 0)
240: return;
241: if ((r = sshbuf_put_u8(loginmsg, 0)) != 0)
1.325 djm 242: fatal_fr(r, "sshbuf_put_u8");
1.303 markus 243: printf("%s", (char *)sshbuf_ptr(loginmsg));
244: sshbuf_reset(loginmsg);
1.179 dtucker 245: }
1.136 markus 246:
1.290 djm 247: static void
248: prepare_auth_info_file(struct passwd *pw, struct sshbuf *info)
249: {
250: int fd = -1, success = 0;
251:
252: if (!options.expose_userauth_info || info == NULL)
253: return;
254:
255: temporarily_use_uid(pw);
256: auth_info_file = xstrdup("/tmp/sshauth.XXXXXXXXXXXXXXX");
257: if ((fd = mkstemp(auth_info_file)) == -1) {
1.325 djm 258: error_f("mkstemp: %s", strerror(errno));
1.290 djm 259: goto out;
260: }
261: if (atomicio(vwrite, fd, sshbuf_mutable_ptr(info),
262: sshbuf_len(info)) != sshbuf_len(info)) {
1.325 djm 263: error_f("write: %s", strerror(errno));
1.290 djm 264: goto out;
265: }
266: if (close(fd) != 0) {
1.325 djm 267: error_f("close: %s", strerror(errno));
1.290 djm 268: goto out;
269: }
270: success = 1;
271: out:
272: if (!success) {
273: if (fd != -1)
274: close(fd);
275: free(auth_info_file);
276: auth_info_file = NULL;
277: }
278: restore_uid();
279: }
280:
1.294 djm 281: static void
1.297 djm 282: set_fwdpermit_from_authopts(struct ssh *ssh, const struct sshauthopt *opts)
1.294 djm 283: {
284: char *tmp, *cp, *host;
285: int port;
286: size_t i;
287:
1.297 djm 288: if ((options.allow_tcp_forwarding & FORWARD_LOCAL) != 0) {
289: channel_clear_permission(ssh, FORWARD_USER, FORWARD_LOCAL);
290: for (i = 0; i < auth_opts->npermitopen; i++) {
291: tmp = cp = xstrdup(auth_opts->permitopen[i]);
292: /* This shouldn't fail as it has already been checked */
1.330 ! dtucker 293: if ((host = hpdelim2(&cp, NULL)) == NULL)
1.325 djm 294: fatal_f("internal error: hpdelim");
1.297 djm 295: host = cleanhostname(host);
296: if (cp == NULL || (port = permitopen_port(cp)) < 0)
1.325 djm 297: fatal_f("internal error: permitopen port");
1.297 djm 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)
1.325 djm 309: fatal_f("internal error: hpdelim");
1.297 djm 310: host = cleanhostname(host);
311: if (cp == NULL || (port = permitopen_port(cp)) < 0)
1.325 djm 312: fatal_f("internal error: permitlisten port");
1.297 djm 313: channel_add_permission(ssh,
314: FORWARD_USER, FORWARD_REMOTE, host, port);
315: free(tmp);
316: }
1.294 djm 317: }
318: }
319:
1.65 markus 320: void
1.292 djm 321: do_authenticated(struct ssh *ssh, Authctxt *authctxt)
1.65 markus 322: {
1.153 markus 323: setproctitle("%s", authctxt->pw->pw_name);
324:
1.294 djm 325: auth_log_authopts("active", auth_opts, 0);
326:
1.65 markus 327: /* setup the channel layer */
1.274 millert 328: /* XXX - streamlocal? */
1.297 djm 329: set_fwdpermit_from_authopts(ssh, auth_opts);
1.296 djm 330:
1.294 djm 331: if (!auth_opts->permit_port_forwarding_flag ||
1.296 djm 332: options.disable_forwarding) {
333: channel_disable_admin(ssh, FORWARD_LOCAL);
334: channel_disable_admin(ssh, FORWARD_REMOTE);
335: } else {
336: if ((options.allow_tcp_forwarding & FORWARD_LOCAL) == 0)
337: channel_disable_admin(ssh, FORWARD_LOCAL);
338: else
339: channel_permit_all(ssh, FORWARD_LOCAL);
340: if ((options.allow_tcp_forwarding & FORWARD_REMOTE) == 0)
341: channel_disable_admin(ssh, FORWARD_REMOTE);
342: else
343: channel_permit_all(ssh, FORWARD_REMOTE);
344: }
1.311 djm 345: auth_debug_send(ssh);
1.65 markus 346:
1.290 djm 347: prepare_auth_info_file(authctxt->pw, authctxt->session_info);
348:
1.292 djm 349: do_authenticated2(ssh, authctxt);
1.290 djm 350:
1.292 djm 351: do_cleanup(ssh, authctxt);
1.65 markus 352: }
353:
1.282 djm 354: /* Check untrusted xauth strings for metacharacters */
355: static int
356: xauth_valid_string(const char *s)
357: {
358: size_t i;
359:
360: for (i = 0; s[i] != '\0'; i++) {
361: if (!isalnum((u_char)s[i]) &&
362: s[i] != '.' && s[i] != ':' && s[i] != '/' &&
363: s[i] != '-' && s[i] != '_')
1.305 deraadt 364: return 0;
1.282 djm 365: }
366: return 1;
367: }
368:
1.269 dtucker 369: #define USE_PIPES 1
1.1 markus 370: /*
371: * This is called to fork and execute a command when we have no tty. This
372: * will call do_child from the child, and server_loop from the parent after
373: * setting up file descriptors and such.
374: */
1.237 djm 375: int
1.292 djm 376: do_exec_no_pty(struct ssh *ssh, Session *s, const char *command)
1.1 markus 377: {
1.137 mpech 378: pid_t pid;
1.238 markus 379: #ifdef USE_PIPES
380: int pin[2], pout[2], perr[2];
381:
1.253 djm 382: if (s == NULL)
383: fatal("do_exec_no_pty: no session");
384:
1.238 markus 385: /* Allocate pipes for communicating with the program. */
1.316 deraadt 386: if (pipe(pin) == -1) {
1.325 djm 387: error_f("pipe in: %.100s", strerror(errno));
1.238 markus 388: return -1;
389: }
1.316 deraadt 390: if (pipe(pout) == -1) {
1.325 djm 391: error_f("pipe out: %.100s", strerror(errno));
1.238 markus 392: close(pin[0]);
393: close(pin[1]);
394: return -1;
395: }
1.316 deraadt 396: if (pipe(perr) == -1) {
1.325 djm 397: error_f("pipe err: %.100s", strerror(errno));
1.256 djm 398: close(pin[0]);
399: close(pin[1]);
400: close(pout[0]);
401: close(pout[1]);
402: return -1;
1.238 markus 403: }
404: #else
1.237 djm 405: int inout[2], err[2];
1.1 markus 406:
1.253 djm 407: if (s == NULL)
408: fatal("do_exec_no_pty: no session");
409:
1.1 markus 410: /* Uses socket pairs to communicate with the program. */
1.316 deraadt 411: if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) == -1) {
1.325 djm 412: error_f("socketpair #1: %.100s", strerror(errno));
1.237 djm 413: return -1;
414: }
1.316 deraadt 415: if (socketpair(AF_UNIX, SOCK_STREAM, 0, err) == -1) {
1.325 djm 416: error_f("socketpair #2: %.100s", strerror(errno));
1.256 djm 417: close(inout[0]);
418: close(inout[1]);
419: return -1;
1.237 djm 420: }
1.238 markus 421: #endif
1.237 djm 422:
1.9 markus 423: session_proctitle(s);
1.1 markus 424:
425: /* Fork the child. */
1.237 djm 426: switch ((pid = fork())) {
427: case -1:
1.325 djm 428: error_f("fork: %.100s", strerror(errno));
1.238 markus 429: #ifdef USE_PIPES
430: close(pin[0]);
431: close(pin[1]);
432: close(pout[0]);
433: close(pout[1]);
1.256 djm 434: close(perr[0]);
1.238 markus 435: close(perr[1]);
436: #else
1.237 djm 437: close(inout[0]);
438: close(inout[1]);
439: close(err[0]);
1.256 djm 440: close(err[1]);
1.238 markus 441: #endif
1.237 djm 442: return -1;
443: case 0:
1.165 markus 444: is_child = 1;
1.144 markus 445:
1.1 markus 446: /*
447: * Create a new session and process group since the 4.4BSD
448: * setlogin() affects the entire process group.
449: */
1.316 deraadt 450: if (setsid() == -1)
1.1 markus 451: error("setsid failed: %.100s", strerror(errno));
452:
1.238 markus 453: #ifdef USE_PIPES
454: /*
455: * Redirect stdin. We close the parent side of the socket
456: * pair, and make the child side the standard input.
457: */
458: close(pin[1]);
1.316 deraadt 459: if (dup2(pin[0], 0) == -1)
1.238 markus 460: perror("dup2 stdin");
461: close(pin[0]);
462:
463: /* Redirect stdout. */
464: close(pout[0]);
1.316 deraadt 465: if (dup2(pout[1], 1) == -1)
1.238 markus 466: perror("dup2 stdout");
467: close(pout[1]);
468:
469: /* Redirect stderr. */
1.256 djm 470: close(perr[0]);
1.316 deraadt 471: if (dup2(perr[1], 2) == -1)
1.238 markus 472: perror("dup2 stderr");
473: close(perr[1]);
474: #else
1.1 markus 475: /*
476: * Redirect stdin, stdout, and stderr. Stdin and stdout will
477: * use the same socket, as some programs (particularly rdist)
478: * seem to depend on it.
479: */
480: close(inout[1]);
1.256 djm 481: close(err[1]);
1.316 deraadt 482: if (dup2(inout[0], 0) == -1) /* stdin */
1.1 markus 483: perror("dup2 stdin");
1.316 deraadt 484: if (dup2(inout[0], 1) == -1) /* stdout (same as stdin) */
1.1 markus 485: perror("dup2 stdout");
1.238 markus 486: close(inout[0]);
1.316 deraadt 487: if (dup2(err[0], 2) == -1) /* stderr */
1.1 markus 488: perror("dup2 stderr");
1.238 markus 489: close(err[0]);
490: #endif
1.1 markus 491:
492: /* Do processing for the child (exec command etc). */
1.292 djm 493: do_child(ssh, s, command);
1.1 markus 494: /* NOTREACHED */
1.237 djm 495: default:
496: break;
1.1 markus 497: }
1.237 djm 498:
1.1 markus 499: s->pid = pid;
1.47 markus 500: /* Set interactive/non-interactive mode. */
1.312 djm 501: ssh_packet_set_interactive(ssh, s->display != NULL,
1.257 djm 502: options.ip_qos_interactive, options.ip_qos_bulk);
1.1 markus 503:
1.238 markus 504: #ifdef USE_PIPES
505: /* We are the parent. Close the child sides of the pipes. */
506: close(pin[0]);
507: close(pout[1]);
508: close(perr[1]);
509:
1.292 djm 510: session_set_fds(ssh, s, pin[1], pout[0], perr[0],
1.283 markus 511: s->is_subsystem, 0);
1.238 markus 512: #else
1.1 markus 513: /* We are the parent. Close the child sides of the socket pairs. */
514: close(inout[0]);
515: close(err[0]);
516:
517: /*
518: * Enter the interactive session. Note: server_loop must be able to
519: * handle the case that fdin and fdout are the same.
520: */
1.313 dtucker 521: session_set_fds(ssh, s, inout[1], inout[1], err[1],
1.283 markus 522: s->is_subsystem, 0);
1.238 markus 523: #endif
1.237 djm 524: return 0;
1.1 markus 525: }
526:
527: /*
528: * This is called to fork and execute a command when we have a tty. This
529: * will call do_child from the child, and server_loop from the parent after
530: * setting up file descriptors, controlling tty, updating wtmp, utmp,
531: * lastlog, and other such operations.
532: */
1.237 djm 533: int
1.292 djm 534: do_exec_pty(struct ssh *ssh, Session *s, const char *command)
1.1 markus 535: {
536: int fdout, ptyfd, ttyfd, ptymaster;
537: pid_t pid;
538:
539: if (s == NULL)
540: fatal("do_exec_pty: no session");
541: ptyfd = s->ptyfd;
542: ttyfd = s->ttyfd;
543:
1.237 djm 544: /*
545: * Create another descriptor of the pty master side for use as the
546: * standard input. We could use the original descriptor, but this
547: * simplifies code in server_loop. The descriptor is bidirectional.
548: * Do this before forking (and cleanup in the child) so as to
549: * detect and gracefully fail out-of-fd conditions.
550: */
1.316 deraadt 551: if ((fdout = dup(ptyfd)) == -1) {
1.325 djm 552: error_f("dup #1: %s", strerror(errno));
1.237 djm 553: close(ttyfd);
554: close(ptyfd);
555: return -1;
556: }
557: /* we keep a reference to the pty master */
1.316 deraadt 558: if ((ptymaster = dup(ptyfd)) == -1) {
1.325 djm 559: error_f("dup #2: %s", strerror(errno));
1.237 djm 560: close(ttyfd);
561: close(ptyfd);
562: close(fdout);
563: return -1;
564: }
565:
1.1 markus 566: /* Fork the child. */
1.237 djm 567: switch ((pid = fork())) {
568: case -1:
1.325 djm 569: error_f("fork: %.100s", strerror(errno));
1.237 djm 570: close(fdout);
571: close(ptymaster);
572: close(ttyfd);
573: close(ptyfd);
574: return -1;
575: case 0:
1.165 markus 576: is_child = 1;
1.97 markus 577:
1.237 djm 578: close(fdout);
579: close(ptymaster);
580:
1.1 markus 581: /* Close the master side of the pseudo tty. */
582: close(ptyfd);
583:
584: /* Make the pseudo tty our controlling tty. */
585: pty_make_controlling_tty(&ttyfd, s->tty);
586:
1.103 markus 587: /* Redirect stdin/stdout/stderr from the pseudo tty. */
1.316 deraadt 588: if (dup2(ttyfd, 0) == -1)
1.103 markus 589: error("dup2 stdin: %s", strerror(errno));
1.316 deraadt 590: if (dup2(ttyfd, 1) == -1)
1.103 markus 591: error("dup2 stdout: %s", strerror(errno));
1.316 deraadt 592: if (dup2(ttyfd, 2) == -1)
1.103 markus 593: error("dup2 stderr: %s", strerror(errno));
1.1 markus 594:
595: /* Close the extra descriptor for the pseudo tty. */
596: close(ttyfd);
597:
1.24 markus 598: /* record login, etc. similar to login(1) */
1.292 djm 599: do_login(ssh, s, command);
1.228 djm 600:
1.237 djm 601: /*
602: * Do common processing for the child, such as execing
603: * the command.
604: */
1.292 djm 605: do_child(ssh, s, command);
1.1 markus 606: /* NOTREACHED */
1.237 djm 607: default:
608: break;
1.1 markus 609: }
610: s->pid = pid;
611:
1.324 deraadt 612: /* Parent. Close the slave side of the pseudo tty. */
1.1 markus 613: close(ttyfd);
614:
1.237 djm 615: /* Enter interactive session. */
1.1 markus 616: s->ptymaster = ptymaster;
1.312 djm 617: ssh_packet_set_interactive(ssh, 1,
1.257 djm 618: options.ip_qos_interactive, options.ip_qos_bulk);
1.292 djm 619: session_set_fds(ssh, s, ptyfd, fdout, -1, 1, 1);
1.237 djm 620: return 0;
1.24 markus 621: }
622:
1.90 markus 623: /*
624: * This is called to fork and execute a command. If another command is
625: * to be forced, execute that instead.
626: */
1.237 djm 627: int
1.292 djm 628: do_exec(struct ssh *ssh, Session *s, const char *command)
1.90 markus 629: {
1.237 djm 630: int ret;
1.280 djm 631: const char *forced = NULL, *tty = NULL;
632: char session_type[1024];
1.237 djm 633:
1.210 dtucker 634: if (options.adm_forced_command) {
635: original_command = command;
636: command = options.adm_forced_command;
1.267 djm 637: forced = "(config)";
1.294 djm 638: } else if (auth_opts->force_command != NULL) {
1.90 markus 639: original_command = command;
1.294 djm 640: command = auth_opts->force_command;
1.267 djm 641: forced = "(key-option)";
642: }
1.306 djm 643: s->forced = 0;
1.267 djm 644: if (forced != NULL) {
1.306 djm 645: s->forced = 1;
1.248 djm 646: if (IS_INTERNAL_SFTP(command)) {
647: s->is_subsystem = s->is_subsystem ?
648: SUBSYSTEM_INT_SFTP : SUBSYSTEM_INT_SFTP_ERROR;
649: } else if (s->is_subsystem)
1.225 markus 650: s->is_subsystem = SUBSYSTEM_EXT;
1.267 djm 651: snprintf(session_type, sizeof(session_type),
652: "forced-command %s '%.900s'", forced, command);
653: } else if (s->is_subsystem) {
654: snprintf(session_type, sizeof(session_type),
655: "subsystem '%.900s'", s->subsys);
656: } else if (command == NULL) {
657: snprintf(session_type, sizeof(session_type), "shell");
658: } else {
659: /* NB. we don't log unforced commands to preserve privacy */
660: snprintf(session_type, sizeof(session_type), "command");
1.90 markus 661: }
1.163 markus 662:
1.267 djm 663: if (s->ttyfd != -1) {
664: tty = s->tty;
665: if (strncmp(tty, "/dev/", 5) == 0)
666: tty += 5;
667: }
668:
1.280 djm 669: verbose("Starting session: %s%s%s for %s from %.200s port %d id %d",
1.267 djm 670: session_type,
671: tty == NULL ? "" : " on ",
672: tty == NULL ? "" : tty,
673: s->pw->pw_name,
1.281 djm 674: ssh_remote_ipaddr(ssh),
675: ssh_remote_port(ssh),
1.280 djm 676: s->self);
1.267 djm 677:
1.163 markus 678: #ifdef GSSAPI
679: if (options.gss_authentication) {
680: temporarily_use_uid(s->pw);
681: ssh_gssapi_storecreds();
682: restore_uid();
683: }
684: #endif
1.90 markus 685: if (s->ttyfd != -1)
1.292 djm 686: ret = do_exec_pty(ssh, s, command);
1.90 markus 687: else
1.292 djm 688: ret = do_exec_no_pty(ssh, s, command);
1.90 markus 689:
1.92 markus 690: original_command = NULL;
1.179 dtucker 691:
692: /*
693: * Clear loginmsg: it's the child's responsibility to display
694: * it to the user, otherwise multiple sessions may accumulate
695: * multiple copies of the login messages.
696: */
1.303 markus 697: sshbuf_reset(loginmsg);
1.237 djm 698:
699: return ret;
1.90 markus 700: }
701:
702:
1.24 markus 703: /* administrative, login(1)-like work */
704: void
1.292 djm 705: do_login(struct ssh *ssh, Session *s, const char *command)
1.24 markus 706: {
707: socklen_t fromlen;
708: struct sockaddr_storage from;
709: struct passwd * pw = s->pw;
710: pid_t pid = getpid();
711:
712: /*
713: * Get IP address of client. If the connection is not a socket, let
714: * the address be 0.0.0.0.
715: */
716: memset(&from, 0, sizeof(from));
1.148 stevesk 717: fromlen = sizeof(from);
1.312 djm 718: if (ssh_packet_connection_is_on_socket(ssh)) {
719: if (getpeername(ssh_packet_get_connection_in(ssh),
1.316 deraadt 720: (struct sockaddr *)&from, &fromlen) == -1) {
1.24 markus 721: debug("getpeername: %.100s", strerror(errno));
1.165 markus 722: cleanup_exit(255);
1.24 markus 723: }
724: }
1.25 markus 725:
1.24 markus 726: /* Record that there was a login on that tty from the remote host. */
1.133 markus 727: if (!use_privsep)
728: record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
1.281 djm 729: session_get_remote_name_or_ip(ssh, utmp_len,
1.158 markus 730: options.use_dns),
1.148 stevesk 731: (struct sockaddr *)&from, fromlen);
1.24 markus 732:
1.73 djm 733: if (check_quietlogin(s, command))
1.24 markus 734: return;
1.73 djm 735:
1.179 dtucker 736: display_loginmsg();
1.73 djm 737:
738: do_motd();
739: }
740:
741: /*
742: * Display the message of the day.
743: */
744: void
745: do_motd(void)
746: {
747: FILE *f;
748: char buf[256];
749:
1.24 markus 750: if (options.print_motd) {
1.28 millert 751: f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
752: "/etc/motd"), "r");
1.24 markus 753: if (f) {
754: while (fgets(buf, sizeof(buf), f))
755: fputs(buf, stdout);
756: fclose(f);
757: }
1.2 markus 758: }
1.73 djm 759: }
760:
761:
762: /*
763: * Check for quiet login, either .hushlogin or command given.
764: */
765: int
766: check_quietlogin(Session *s, const char *command)
767: {
768: char buf[256];
1.96 dugsong 769: struct passwd *pw = s->pw;
1.73 djm 770: struct stat st;
771:
772: /* Return 1 if .hushlogin exists or a command given. */
773: if (command != NULL)
774: return 1;
775: snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
776: if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
777: return 1;
778: return 0;
1.1 markus 779: }
780:
781: /*
782: * Reads environment variables from the given file and adds/overrides them
783: * into the environment. If the file does not exist, this does nothing.
784: * Otherwise, it must consist of empty lines, comments (line starts with '#')
785: * and assignments of the form name=value. No other forms are allowed.
1.323 djm 786: * If allowlist is not NULL, then it is interpreted as a pattern list and
1.301 djm 787: * only variable names that match it will be accepted.
1.1 markus 788: */
1.94 itojun 789: static void
1.45 markus 790: read_environment_file(char ***env, u_int *envsize,
1.323 djm 791: const char *filename, const char *allowlist)
1.1 markus 792: {
793: FILE *f;
1.298 markus 794: char *line = NULL, *cp, *value;
795: size_t linesize = 0;
1.142 deraadt 796: u_int lineno = 0;
1.1 markus 797:
798: f = fopen(filename, "r");
799: if (!f)
800: return;
801:
1.298 markus 802: while (getline(&line, &linesize, f) != -1) {
1.142 deraadt 803: if (++lineno > 1000)
804: fatal("Too many lines in environment file %s", filename);
1.298 markus 805: for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
1.1 markus 806: ;
807: if (!*cp || *cp == '#' || *cp == '\n')
808: continue;
1.224 gilles 809:
810: cp[strcspn(cp, "\n")] = '\0';
811:
1.1 markus 812: value = strchr(cp, '=');
813: if (value == NULL) {
1.142 deraadt 814: fprintf(stderr, "Bad line %u in %.100s\n", lineno,
815: filename);
1.1 markus 816: continue;
817: }
1.14 deraadt 818: /*
819: * Replace the equals sign by nul, and advance value to
820: * the value string.
821: */
1.1 markus 822: *value = '\0';
823: value++;
1.323 djm 824: if (allowlist != NULL &&
825: match_pattern_list(cp, allowlist, 0) != 1)
1.301 djm 826: continue;
1.1 markus 827: child_set_env(env, envsize, cp, value);
828: }
1.298 markus 829: free(line);
1.1 markus 830: fclose(f);
831: }
832:
1.127 markus 833: static char **
1.292 djm 834: do_setup_env(struct ssh *ssh, Session *s, const char *shell)
1.1 markus 835: {
836: char buf[256];
1.294 djm 837: size_t n;
1.127 markus 838: u_int i, envsize;
1.300 djm 839: char *ocp, *cp, *value, **env, *laddr;
1.127 markus 840: struct passwd *pw = s->pw;
1.1 markus 841:
842: /* Initialize the environment. */
843: envsize = 100;
1.220 djm 844: env = xcalloc(envsize, sizeof(char *));
1.1 markus 845: env[0] = NULL;
846:
1.161 markus 847: #ifdef GSSAPI
1.168 djm 848: /* Allow any GSSAPI methods that we've used to alter
1.319 djm 849: * the child's environment as they see fit
1.161 markus 850: */
851: ssh_gssapi_do_child(&env, &envsize);
852: #endif
853:
1.284 djm 854: /* Set basic environment. */
855: for (i = 0; i < s->num_env; i++)
856: child_set_env(&env, &envsize, s->env[i].name, s->env[i].val);
857:
858: child_set_env(&env, &envsize, "USER", pw->pw_name);
859: child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
860: child_set_env(&env, &envsize, "HOME", pw->pw_dir);
861: if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
862: child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
863: else
864: child_set_env(&env, &envsize, "PATH", getenv("PATH"));
865:
866: snprintf(buf, sizeof buf, "%.200s/%.50s", _PATH_MAILDIR, pw->pw_name);
867: child_set_env(&env, &envsize, "MAIL", buf);
868:
869: /* Normal systems set SHELL by default. */
870: child_set_env(&env, &envsize, "SHELL", shell);
1.1 markus 871:
872: if (getenv("TZ"))
873: child_set_env(&env, &envsize, "TZ", getenv("TZ"));
1.299 djm 874: if (s->term)
875: child_set_env(&env, &envsize, "TERM", s->term);
876: if (s->display)
877: child_set_env(&env, &envsize, "DISPLAY", s->display);
878: #ifdef KRB5
879: if (s->authctxt->krb5_ticket_file)
880: child_set_env(&env, &envsize, "KRB5CCNAME",
881: s->authctxt->krb5_ticket_file);
882: #endif
883: if (auth_sock_name != NULL)
884: child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
885: auth_sock_name);
886:
1.1 markus 887:
1.294 djm 888: /* Set custom environment options from pubkey authentication. */
889: if (options.permit_user_env) {
890: for (n = 0 ; n < auth_opts->nenv; n++) {
891: ocp = xstrdup(auth_opts->env[n]);
892: cp = strchr(ocp, '=');
1.326 djm 893: if (cp != NULL) {
1.294 djm 894: *cp = '\0';
1.323 djm 895: /* Apply PermitUserEnvironment allowlist */
896: if (options.permit_user_env_allowlist == NULL ||
1.301 djm 897: match_pattern_list(ocp,
1.323 djm 898: options.permit_user_env_allowlist, 0) == 1)
1.301 djm 899: child_set_env(&env, &envsize,
900: ocp, cp + 1);
1.294 djm 901: }
902: free(ocp);
903: }
1.1 markus 904: }
905:
1.299 djm 906: /* read $HOME/.ssh/environment. */
907: if (options.permit_user_env) {
1.327 djm 908: snprintf(buf, sizeof buf, "%.200s/%s/environment",
909: pw->pw_dir, _PATH_SSH_USER_DIR);
1.301 djm 910: read_environment_file(&env, &envsize, buf,
1.323 djm 911: options.permit_user_env_allowlist);
1.300 djm 912: }
913:
914: /* Environment specified by admin */
915: for (i = 0; i < options.num_setenv; i++) {
916: cp = xstrdup(options.setenv[i]);
917: if ((value = strchr(cp, '=')) == NULL) {
918: /* shouldn't happen; vars are checked in servconf.c */
919: fatal("Invalid config SetEnv: %s", options.setenv[i]);
920: }
921: *value++ = '\0';
922: child_set_env(&env, &envsize, cp, value);
1.299 djm 923: }
924:
1.149 stevesk 925: /* SSH_CLIENT deprecated */
1.1 markus 926: snprintf(buf, sizeof buf, "%.50s %d %d",
1.281 djm 927: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh),
928: ssh_local_port(ssh));
1.1 markus 929: child_set_env(&env, &envsize, "SSH_CLIENT", buf);
1.149 stevesk 930:
1.312 djm 931: laddr = get_local_ipaddr(ssh_packet_get_connection_in(ssh));
1.149 stevesk 932: snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
1.281 djm 933: ssh_remote_ipaddr(ssh), ssh_remote_port(ssh),
934: laddr, ssh_local_port(ssh));
1.265 djm 935: free(laddr);
1.149 stevesk 936: child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
1.1 markus 937:
1.293 djm 938: if (tun_fwd_ifnames != NULL)
939: child_set_env(&env, &envsize, "SSH_TUNNEL", tun_fwd_ifnames);
1.290 djm 940: if (auth_info_file != NULL)
941: child_set_env(&env, &envsize, "SSH_USER_AUTH", auth_info_file);
1.60 markus 942: if (s->ttyfd != -1)
943: child_set_env(&env, &envsize, "SSH_TTY", s->tty);
1.34 markus 944: if (original_command)
945: child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
946: original_command);
1.1 markus 947:
948: if (debug_flag) {
949: /* dump the environment */
950: fprintf(stderr, "Environment:\n");
951: for (i = 0; env[i]; i++)
952: fprintf(stderr, " %.200s\n", env[i]);
953: }
1.127 markus 954: return env;
955: }
956:
957: /*
958: * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
959: * first in this order).
960: */
961: static void
1.294 djm 962: do_rc_files(struct ssh *ssh, Session *s, const char *shell)
1.127 markus 963: {
964: FILE *f = NULL;
1.320 dtucker 965: char *cmd = NULL, *user_rc = NULL;
1.127 markus 966: int do_xauth;
967: struct stat st;
968:
969: do_xauth =
970: s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
1.322 djm 971: xasprintf(&user_rc, "%s/%s", s->pw->pw_dir, _PATH_SSH_USER_RC);
1.127 markus 972:
1.231 djm 973: /* ignore _PATH_SSH_USER_RC for subsystems and admin forced commands */
1.232 djm 974: if (!s->is_subsystem && options.adm_forced_command == NULL &&
1.294 djm 975: auth_opts->permit_user_rc && options.permit_user_rc &&
1.320 dtucker 976: stat(user_rc, &st) >= 0) {
977: if (xasprintf(&cmd, "%s -c '%s %s'", shell, _PATH_BSHELL,
978: user_rc) == -1)
1.325 djm 979: fatal_f("xasprintf: %s", strerror(errno));
1.127 markus 980: if (debug_flag)
981: fprintf(stderr, "Running %s\n", cmd);
982: f = popen(cmd, "w");
983: if (f) {
984: if (do_xauth)
985: fprintf(f, "%s %s\n", s->auth_proto,
986: s->auth_data);
987: pclose(f);
988: } else
989: fprintf(stderr, "Could not run %s\n",
1.320 dtucker 990: user_rc);
1.127 markus 991: } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
992: if (debug_flag)
993: fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
994: _PATH_SSH_SYSTEM_RC);
995: f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
996: if (f) {
997: if (do_xauth)
998: fprintf(f, "%s %s\n", s->auth_proto,
999: s->auth_data);
1000: pclose(f);
1001: } else
1002: fprintf(stderr, "Could not run %s\n",
1003: _PATH_SSH_SYSTEM_RC);
1004: } else if (do_xauth && options.xauth_location != NULL) {
1005: /* Add authority data to .Xauthority if appropriate. */
1006: if (debug_flag) {
1007: fprintf(stderr,
1.151 stevesk 1008: "Running %.500s remove %.100s\n",
1.165 markus 1009: options.xauth_location, s->auth_display);
1.151 stevesk 1010: fprintf(stderr,
1011: "%.500s add %.100s %.100s %.100s\n",
1.127 markus 1012: options.xauth_location, s->auth_display,
1013: s->auth_proto, s->auth_data);
1014: }
1.320 dtucker 1015: if (xasprintf(&cmd, "%s -q -", options.xauth_location) == -1)
1.325 djm 1016: fatal_f("xasprintf: %s", strerror(errno));
1.127 markus 1017: f = popen(cmd, "w");
1018: if (f) {
1.151 stevesk 1019: fprintf(f, "remove %s\n",
1020: s->auth_display);
1.127 markus 1021: fprintf(f, "add %s %s %s\n",
1022: s->auth_display, s->auth_proto,
1023: s->auth_data);
1024: pclose(f);
1025: } else {
1026: fprintf(stderr, "Could not run %s\n",
1027: cmd);
1028: }
1029: }
1.320 dtucker 1030: free(cmd);
1031: free(user_rc);
1.127 markus 1032: }
1033:
1034: static void
1035: do_nologin(struct passwd *pw)
1036: {
1037: FILE *f = NULL;
1.251 dtucker 1038: char buf[1024], *nl, *def_nl = _PATH_NOLOGIN;
1039: struct stat sb;
1.127 markus 1040:
1.260 guenther 1041: if (login_getcapbool(lc, "ignorenologin", 0) || pw->pw_uid == 0)
1.251 dtucker 1042: return;
1043: nl = login_getcapstr(lc, "nologin", def_nl, def_nl);
1044:
1045: if (stat(nl, &sb) == -1) {
1046: if (nl != def_nl)
1.265 djm 1047: free(nl);
1.251 dtucker 1048: return;
1049: }
1050:
1051: /* /etc/nologin exists. Print its contents if we can and exit. */
1052: logit("User %.100s not allowed because %s exists", pw->pw_name, nl);
1053: if ((f = fopen(nl, "r")) != NULL) {
1.127 markus 1054: while (fgets(buf, sizeof(buf), f))
1055: fputs(buf, stderr);
1056: fclose(f);
1057: }
1.251 dtucker 1058: exit(254);
1.127 markus 1059: }
1060:
1.226 djm 1061: /*
1062: * Chroot into a directory after checking it for safety: all path components
1063: * must be root-owned directories with strict permissions.
1064: */
1065: static void
1066: safely_chroot(const char *path, uid_t uid)
1067: {
1068: const char *cp;
1.277 deraadt 1069: char component[PATH_MAX];
1.226 djm 1070: struct stat st;
1071:
1.308 djm 1072: if (!path_absolute(path))
1.226 djm 1073: fatal("chroot path does not begin at root");
1074: if (strlen(path) >= sizeof(component))
1075: fatal("chroot path too long");
1076:
1077: /*
1078: * Descend the path, checking that each component is a
1079: * root-owned directory with strict permissions.
1080: */
1081: for (cp = path; cp != NULL;) {
1082: if ((cp = strchr(cp, '/')) == NULL)
1083: strlcpy(component, path, sizeof(component));
1084: else {
1085: cp++;
1086: memcpy(component, path, cp - path);
1087: component[cp - path] = '\0';
1088: }
1089:
1.325 djm 1090: debug3_f("checking '%s'", component);
1.226 djm 1091:
1092: if (stat(component, &st) != 0)
1.325 djm 1093: fatal_f("stat(\"%s\"): %s",
1.226 djm 1094: component, strerror(errno));
1095: if (st.st_uid != 0 || (st.st_mode & 022) != 0)
1096: fatal("bad ownership or modes for chroot "
1.312 djm 1097: "directory %s\"%s\"",
1.226 djm 1098: cp == NULL ? "" : "component ", component);
1099: if (!S_ISDIR(st.st_mode))
1100: fatal("chroot path %s\"%s\" is not a directory",
1101: cp == NULL ? "" : "component ", component);
1102:
1103: }
1104:
1105: if (chdir(path) == -1)
1106: fatal("Unable to chdir to chroot path \"%s\": "
1107: "%s", path, strerror(errno));
1108: if (chroot(path) == -1)
1109: fatal("chroot(\"%s\"): %s", path, strerror(errno));
1110: if (chdir("/") == -1)
1.325 djm 1111: fatal_f("chdir(/) after chroot: %s", strerror(errno));
1.226 djm 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) {
1.328 djm 1131: tmp = tilde_expand_filename(options.chroot_directory,
1.227 djm 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();
1.321 djm 1206:
1207: /* Stop directing logs to a high-numbered fd before we close it */
1208: log_redirect_stderr_to(NULL);
1.172 markus 1209:
1210: /*
1.188 djm 1211: * Close any extra open file descriptors so that we don't have them
1.172 markus 1212: * hanging around in clients. Note that we want to do this after
1213: * initgroups, because at least on Solaris 2.3 it leaves file
1214: * descriptors open.
1215: */
1.258 djm 1216: closefrom(STDERR_FILENO + 1);
1.172 markus 1217: }
1218:
1.127 markus 1219: /*
1220: * Performs common processing for the child, such as setting up the
1221: * environment, closing extra file descriptors, setting the user and group
1222: * ids, and executing the command or shell.
1223: */
1.225 markus 1224: #define ARGV_MAX 10
1.127 markus 1225: void
1.292 djm 1226: do_child(struct ssh *ssh, Session *s, const char *command)
1.127 markus 1227: {
1228: extern char **environ;
1.314 djm 1229: char **env, *argv[ARGV_MAX], remote_id[512];
1.284 djm 1230: const char *shell, *shell0;
1.127 markus 1231: struct passwd *pw = s->pw;
1.239 djm 1232: int r = 0;
1.127 markus 1233:
1.314 djm 1234: sshpkt_fmt_connection_id(ssh, remote_id, sizeof(remote_id));
1235:
1.127 markus 1236: /* remove hostkey from the child's memory */
1237: destroy_sensitive_data();
1.312 djm 1238: ssh_packet_clear_keys(ssh);
1.127 markus 1239:
1.172 markus 1240: /* Force a password change */
1241: if (s->authctxt->force_pwchange) {
1242: do_setusercontext(pw);
1.292 djm 1243: child_close_fds(ssh);
1.172 markus 1244: do_pwchange(s);
1245: exit(1);
1246: }
1247:
1.127 markus 1248: /*
1249: * Login(1) does this as well, and it needs uid 0 for the "-h"
1250: * switch, so we let login(1) to this for us.
1251: */
1.284 djm 1252: do_nologin(pw);
1253: do_setusercontext(pw);
1.127 markus 1254:
1255: /*
1256: * Get the shell from the password data. An empty shell field is
1257: * legal, and means /bin/sh.
1258: */
1259: shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
1.152 markus 1260:
1261: /*
1262: * Make sure $SHELL points to the shell from the password file,
1263: * even if shell is overridden from login.conf
1264: */
1.292 djm 1265: env = do_setup_env(ssh, s, shell);
1.152 markus 1266:
1.127 markus 1267: shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
1268:
1.1 markus 1269: /*
1270: * Close the connection descriptors; note that this is the child, and
1271: * the server will still have the socket open, and it is important
1272: * that we do not shutdown it. Note that the descriptors cannot be
1273: * closed before building the environment, as we call
1.281 djm 1274: * ssh_remote_ipaddr there.
1.1 markus 1275: */
1.292 djm 1276: child_close_fds(ssh);
1.1 markus 1277:
1278: /*
1.125 deraadt 1279: * Must take new environment into use so that .ssh/rc,
1280: * /etc/ssh/sshrc and xauth are run in the proper environment.
1.1 markus 1281: */
1282: environ = env;
1.170 jakob 1283:
1284: #ifdef KRB5
1285: /*
1286: * At this point, we check to see if AFS is active and if we have
1287: * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
1288: * if we can (and need to) extend the ticket into an AFS token. If
1289: * we don't do this, we run into potential problems if the user's
1290: * home directory is in AFS and it's not world-readable.
1291: */
1292:
1293: if (options.kerberos_get_afs_token && k_hasafs() &&
1.185 djm 1294: (s->authctxt->krb5_ctx != NULL)) {
1.170 jakob 1295: char cell[64];
1296:
1297: debug("Getting AFS token");
1298:
1299: k_setpag();
1300:
1301: if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
1302: krb5_afslog(s->authctxt->krb5_ctx,
1303: s->authctxt->krb5_fwd_ccache, cell, NULL);
1304:
1305: krb5_afslog_home(s->authctxt->krb5_ctx,
1306: s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
1307: }
1308: #endif
1.104 markus 1309:
1.188 djm 1310: /* Change current directory to the user's home directory. */
1.316 deraadt 1311: if (chdir(pw->pw_dir) == -1) {
1.239 djm 1312: /* Suppress missing homedir warning for chroot case */
1313: r = login_getcapbool(lc, "requirehome", 0);
1.279 djm 1314: if (r || !in_chroot) {
1.239 djm 1315: fprintf(stderr, "Could not chdir to home "
1316: "directory %s: %s\n", pw->pw_dir,
1317: strerror(errno));
1.279 djm 1318: }
1.239 djm 1319: if (r)
1.104 markus 1320: exit(1);
1321: }
1.230 djm 1322:
1323: closefrom(STDERR_FILENO + 1);
1.1 markus 1324:
1.294 djm 1325: do_rc_files(ssh, s, shell);
1.67 markus 1326:
1327: /* restore SIGPIPE for child */
1.318 dtucker 1328: ssh_signal(SIGPIPE, SIG_DFL);
1.67 markus 1329:
1.248 djm 1330: if (s->is_subsystem == SUBSYSTEM_INT_SFTP_ERROR) {
1.314 djm 1331: error("Connection from %s: refusing non-sftp session",
1332: remote_id);
1.248 djm 1333: printf("This service allows sftp connections only.\n");
1334: fflush(NULL);
1335: exit(1);
1336: } else if (s->is_subsystem == SUBSYSTEM_INT_SFTP) {
1.225 markus 1337: extern int optind, optreset;
1338: int i;
1339: char *p, *args;
1340:
1.246 stevesk 1341: setproctitle("%s@%s", s->pw->pw_name, INTERNAL_SFTP_NAME);
1.243 millert 1342: args = xstrdup(command ? command : "sftp-server");
1.225 markus 1343: for (i = 0, (p = strtok(args, " ")); p; (p = strtok(NULL, " ")))
1344: if (i < ARGV_MAX - 1)
1345: argv[i++] = p;
1346: argv[i] = NULL;
1347: optind = optreset = 1;
1348: __progname = argv[0];
1.226 djm 1349: exit(sftp_server_main(i, argv, s->pw));
1.225 markus 1350: }
1.247 djm 1351:
1352: fflush(NULL);
1.225 markus 1353:
1.127 markus 1354: /* Get the last component of the shell name. */
1355: if ((shell0 = strrchr(shell, '/')) != NULL)
1356: shell0++;
1357: else
1358: shell0 = shell;
1359:
1.1 markus 1360: /*
1361: * If we have no command, execute the shell. In this case, the shell
1362: * name to be passed in argv[0] is preceded by '-' to indicate that
1363: * this is a login shell.
1364: */
1365: if (!command) {
1.127 markus 1366: char argv0[256];
1.1 markus 1367:
1.127 markus 1368: /* Start the shell. Set initial character to '-'. */
1369: argv0[0] = '-';
1.1 markus 1370:
1.127 markus 1371: if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
1.128 markus 1372: >= sizeof(argv0) - 1) {
1.127 markus 1373: errno = EINVAL;
1.1 markus 1374: perror(shell);
1375: exit(1);
1.127 markus 1376: }
1.1 markus 1377:
1.127 markus 1378: /* Execute the shell. */
1379: argv[0] = argv0;
1380: argv[1] = NULL;
1381: execve(shell, argv, env);
1382:
1383: /* Executing the shell failed. */
1384: perror(shell);
1385: exit(1);
1.1 markus 1386: }
1387: /*
1388: * Execute the command using the user's shell. This uses the -c
1389: * option to execute the command.
1390: */
1.127 markus 1391: argv[0] = (char *) shell0;
1.1 markus 1392: argv[1] = "-c";
1393: argv[2] = (char *) command;
1394: argv[3] = NULL;
1395: execve(shell, argv, env);
1396: perror(shell);
1397: exit(1);
1398: }
1399:
1.237 djm 1400: void
1401: session_unused(int id)
1402: {
1.325 djm 1403: debug3_f("session id %d unused", id);
1.237 djm 1404: if (id >= options.max_sessions ||
1405: id >= sessions_nalloc) {
1.325 djm 1406: fatal_f("insane session id %d (max %d nalloc %d)",
1407: id, options.max_sessions, sessions_nalloc);
1.237 djm 1408: }
1.270 tedu 1409: memset(&sessions[id], 0, sizeof(*sessions));
1.237 djm 1410: sessions[id].self = id;
1411: sessions[id].used = 0;
1412: sessions[id].chanid = -1;
1413: sessions[id].ptyfd = -1;
1414: sessions[id].ttyfd = -1;
1415: sessions[id].ptymaster = -1;
1416: sessions[id].x11_chanids = NULL;
1417: sessions[id].next_unused = sessions_first_unused;
1418: sessions_first_unused = id;
1419: }
1420:
1.1 markus 1421: Session *
1422: session_new(void)
1423: {
1.237 djm 1424: Session *s, *tmp;
1425:
1426: if (sessions_first_unused == -1) {
1427: if (sessions_nalloc >= options.max_sessions)
1428: return NULL;
1.325 djm 1429: debug2_f("allocate (allocated %d max %d)",
1430: sessions_nalloc, options.max_sessions);
1.288 deraadt 1431: tmp = xrecallocarray(sessions, sessions_nalloc,
1432: sessions_nalloc + 1, sizeof(*sessions));
1.237 djm 1433: if (tmp == NULL) {
1.325 djm 1434: error_f("cannot allocate %d sessions",
1435: sessions_nalloc + 1);
1.237 djm 1436: return NULL;
1437: }
1438: sessions = tmp;
1439: session_unused(sessions_nalloc++);
1440: }
1441:
1442: if (sessions_first_unused >= sessions_nalloc ||
1443: sessions_first_unused < 0) {
1.325 djm 1444: fatal_f("insane first_unused %d max %d nalloc %d",
1445: sessions_first_unused, options.max_sessions,
1.237 djm 1446: sessions_nalloc);
1447: }
1448:
1449: s = &sessions[sessions_first_unused];
1.325 djm 1450: if (s->used)
1451: fatal_f("session %d already used", sessions_first_unused);
1.237 djm 1452: sessions_first_unused = s->next_unused;
1453: s->used = 1;
1454: s->next_unused = -1;
1455: debug("session_new: session %d", s->self);
1456:
1457: return s;
1.1 markus 1458: }
1459:
1.94 itojun 1460: static void
1.1 markus 1461: session_dump(void)
1462: {
1463: int i;
1.237 djm 1464: for (i = 0; i < sessions_nalloc; i++) {
1.1 markus 1465: Session *s = &sessions[i];
1.237 djm 1466:
1.329 djm 1467: debug("dump: used %d next_unused %d session %d "
1.237 djm 1468: "channel %d pid %ld",
1.1 markus 1469: s->used,
1.237 djm 1470: s->next_unused,
1.1 markus 1471: s->self,
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) {
1.325 djm 1818: error_fr(r, "parse");
1.306 djm 1819: goto out;
1820: }
1821: if ((sig = name2sig(signame)) == -1) {
1.325 djm 1822: error_f("unsupported signal \"%s\"", signame);
1.306 djm 1823: goto out;
1824: }
1825: if (s->pid <= 0) {
1.325 djm 1826: error_f("no pid for session %d", s->self);
1.306 djm 1827: goto out;
1828: }
1829: if (s->forced || s->is_subsystem) {
1.325 djm 1830: error_f("refusing to send signal %s to %s session",
1.306 djm 1831: signame, s->forced ? "forced-command" : "subsystem");
1832: goto out;
1833: }
1834: if (!use_privsep || mm_is_monitor()) {
1.325 djm 1835: error_f("session signalling requires privilege separation");
1.306 djm 1836: goto out;
1837: }
1838:
1.325 djm 1839: debug_f("signal %s, killpg(%ld, %d)", signame, (long)s->pid, sig);
1.306 djm 1840: temporarily_use_uid(s->pw);
1841: r = killpg(s->pid, sig);
1842: restore_uid();
1843: if (r != 0) {
1.325 djm 1844: error_f("killpg(%ld, %d): %s", (long)s->pid,
1.306 djm 1845: sig, strerror(errno));
1846: goto out;
1847: }
1848:
1849: /* success */
1850: success = 1;
1851: out:
1852: free(signame);
1853: return success;
1854: }
1855:
1.173 djm 1856: static int
1.292 djm 1857: session_auth_agent_req(struct ssh *ssh, Session *s)
1.43 markus 1858: {
1859: static int called = 0;
1.312 djm 1860: int r;
1.294 djm 1861:
1.312 djm 1862: if ((r = sshpkt_get_end(ssh)) != 0)
1863: sshpkt_fatal(ssh, r, "%s: parse packet", __func__);
1.294 djm 1864: if (!auth_opts->permit_agent_forwarding_flag ||
1865: !options.allow_agent_forwarding) {
1.325 djm 1866: debug_f("agent forwarding disabled");
1.44 markus 1867: return 0;
1868: }
1.43 markus 1869: if (called) {
1870: return 0;
1871: } else {
1872: called = 1;
1.292 djm 1873: return auth_input_request_forwarding(ssh, s->pw);
1.43 markus 1874: }
1875: }
1876:
1.123 markus 1877: int
1.292 djm 1878: session_input_channel_req(struct ssh *ssh, Channel *c, const char *rtype)
1.2 markus 1879: {
1880: int success = 0;
1881: Session *s;
1882:
1.123 markus 1883: if ((s = session_by_channel(c->self)) == NULL) {
1.325 djm 1884: logit_f("no session %d req %.100s", c->self, rtype);
1.123 markus 1885: return 0;
1886: }
1.325 djm 1887: debug_f("session %d req %s", s->self, rtype);
1.2 markus 1888:
1889: /*
1.64 markus 1890: * a session is in LARVAL state until a shell, a command
1891: * or a subsystem is executed
1.2 markus 1892: */
1893: if (c->type == SSH_CHANNEL_LARVAL) {
1894: if (strcmp(rtype, "shell") == 0) {
1.292 djm 1895: success = session_shell_req(ssh, s);
1.2 markus 1896: } else if (strcmp(rtype, "exec") == 0) {
1.292 djm 1897: success = session_exec_req(ssh, s);
1.2 markus 1898: } else if (strcmp(rtype, "pty-req") == 0) {
1.292 djm 1899: success = session_pty_req(ssh, s);
1.7 markus 1900: } else if (strcmp(rtype, "x11-req") == 0) {
1.292 djm 1901: success = session_x11_req(ssh, s);
1.43 markus 1902: } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
1.292 djm 1903: success = session_auth_agent_req(ssh, s);
1.7 markus 1904: } else if (strcmp(rtype, "subsystem") == 0) {
1.292 djm 1905: success = session_subsystem_req(ssh, s);
1.173 djm 1906: } else if (strcmp(rtype, "env") == 0) {
1.292 djm 1907: success = session_env_req(ssh, s);
1.2 markus 1908: }
1909: }
1910: if (strcmp(rtype, "window-change") == 0) {
1.292 djm 1911: success = session_window_change_req(ssh, s);
1.177 djm 1912: } else if (strcmp(rtype, "break") == 0) {
1.292 djm 1913: success = session_break_req(ssh, s);
1.306 djm 1914: } else if (strcmp(rtype, "signal") == 0) {
1915: success = session_signal_req(ssh, s);
1.2 markus 1916: }
1.177 djm 1917:
1.123 markus 1918: return success;
1.2 markus 1919: }
1920:
1921: void
1.292 djm 1922: session_set_fds(struct ssh *ssh, Session *s,
1923: int fdin, int fdout, int fderr, int ignore_fderr, int is_tty)
1.2 markus 1924: {
1925: /*
1926: * now that have a child and a pipe to the child,
1927: * we can activate our channel and register the fd's
1928: */
1929: if (s->chanid == -1)
1930: fatal("no channel for session %d", s->self);
1.292 djm 1931: channel_set_fds(ssh, s->chanid,
1.2 markus 1932: fdout, fdin, fderr,
1.256 djm 1933: ignore_fderr ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
1.241 dtucker 1934: 1, is_tty, CHAN_SES_WINDOW_DEFAULT);
1.2 markus 1935: }
1936:
1.85 markus 1937: /*
1938: * Function to perform pty cleanup. Also called if we get aborted abnormally
1939: * (e.g., due to a dropped connection).
1940: */
1.130 provos 1941: void
1.165 markus 1942: session_pty_cleanup2(Session *s)
1.1 markus 1943: {
1.85 markus 1944: if (s == NULL) {
1.325 djm 1945: error_f("no session");
1.85 markus 1946: return;
1947: }
1948: if (s->ttyfd == -1)
1.1 markus 1949: return;
1950:
1.325 djm 1951: debug_f("session %d release %s", s->self, s->tty);
1.1 markus 1952:
1953: /* Record that the user has logged out. */
1.85 markus 1954: if (s->pid != 0)
1955: record_logout(s->pid, s->tty);
1.1 markus 1956:
1957: /* Release the pseudo-tty. */
1.130 provos 1958: if (getuid() == 0)
1959: pty_release(s->tty);
1.1 markus 1960:
1961: /*
1962: * Close the server side of the socket pairs. We must do this after
1963: * the pty cleanup, so that another process doesn't get this pty
1964: * while we're still cleaning up.
1965: */
1.316 deraadt 1966: if (s->ptymaster != -1 && close(s->ptymaster) == -1)
1.237 djm 1967: error("close(s->ptymaster/%d): %s",
1968: s->ptymaster, strerror(errno));
1.108 markus 1969:
1970: /* unlink pty from session */
1971: s->ttyfd = -1;
1.2 markus 1972: }
1973:
1.130 provos 1974: void
1.165 markus 1975: session_pty_cleanup(Session *s)
1.130 provos 1976: {
1.165 markus 1977: PRIVSEP(session_pty_cleanup2(s));
1.130 provos 1978: }
1979:
1.147 markus 1980: static char *
1981: sig2name(int sig)
1982: {
1983: #define SSH_SIG(x) if (sig == SIG ## x) return #x
1984: SSH_SIG(ABRT);
1985: SSH_SIG(ALRM);
1986: SSH_SIG(FPE);
1987: SSH_SIG(HUP);
1988: SSH_SIG(ILL);
1989: SSH_SIG(INT);
1990: SSH_SIG(KILL);
1991: SSH_SIG(PIPE);
1992: SSH_SIG(QUIT);
1993: SSH_SIG(SEGV);
1994: SSH_SIG(TERM);
1995: SSH_SIG(USR1);
1996: SSH_SIG(USR2);
1997: #undef SSH_SIG
1998: return "SIG@openssh.com";
1999: }
2000:
1.94 itojun 2001: static void
1.292 djm 2002: session_close_x11(struct ssh *ssh, int id)
1.184 djm 2003: {
2004: Channel *c;
2005:
1.292 djm 2006: if ((c = channel_by_id(ssh, id)) == NULL) {
1.325 djm 2007: debug_f("x11 channel %d missing", id);
1.184 djm 2008: } else {
2009: /* Detach X11 listener */
1.325 djm 2010: debug_f("detach x11 channel %d", id);
1.292 djm 2011: channel_cancel_cleanup(ssh, id);
1.184 djm 2012: if (c->ostate != CHAN_OUTPUT_CLOSED)
1.292 djm 2013: chan_mark_dead(ssh, c);
1.184 djm 2014: }
2015: }
2016:
2017: static void
1.292 djm 2018: session_close_single_x11(struct ssh *ssh, int id, void *arg)
1.184 djm 2019: {
2020: Session *s;
2021: u_int i;
2022:
1.325 djm 2023: debug3_f("channel %d", id);
1.292 djm 2024: channel_cancel_cleanup(ssh, id);
1.221 stevesk 2025: if ((s = session_by_x11_channel(id)) == NULL)
1.325 djm 2026: fatal_f("no x11 channel %d", id);
1.184 djm 2027: for (i = 0; s->x11_chanids[i] != -1; i++) {
1.325 djm 2028: debug_f("session %d: closing channel %d",
2029: s->self, s->x11_chanids[i]);
1.184 djm 2030: /*
2031: * The channel "id" is already closing, but make sure we
2032: * close all of its siblings.
2033: */
2034: if (s->x11_chanids[i] != id)
1.292 djm 2035: session_close_x11(ssh, s->x11_chanids[i]);
1.184 djm 2036: }
1.265 djm 2037: free(s->x11_chanids);
1.184 djm 2038: s->x11_chanids = NULL;
1.265 djm 2039: free(s->display);
2040: s->display = NULL;
2041: free(s->auth_proto);
2042: s->auth_proto = NULL;
2043: free(s->auth_data);
2044: s->auth_data = NULL;
2045: free(s->auth_display);
2046: s->auth_display = NULL;
1.184 djm 2047: }
2048:
2049: static void
1.292 djm 2050: session_exit_message(struct ssh *ssh, Session *s, int status)
1.2 markus 2051: {
2052: Channel *c;
1.312 djm 2053: int r;
1.124 markus 2054:
1.292 djm 2055: if ((c = channel_lookup(ssh, s->chanid)) == NULL)
1.325 djm 2056: fatal_f("session %d: no channel %d", s->self, s->chanid);
2057: debug_f("session %d channel %d pid %ld",
2058: s->self, s->chanid, (long)s->pid);
1.2 markus 2059:
2060: if (WIFEXITED(status)) {
1.292 djm 2061: channel_request_start(ssh, s->chanid, "exit-status", 0);
1.312 djm 2062: if ((r = sshpkt_put_u32(ssh, WEXITSTATUS(status))) != 0 ||
2063: (r = sshpkt_send(ssh)) != 0)
2064: sshpkt_fatal(ssh, r, "%s: exit reply", __func__);
1.2 markus 2065: } else if (WIFSIGNALED(status)) {
1.292 djm 2066: channel_request_start(ssh, s->chanid, "exit-signal", 0);
1.312 djm 2067: if ((r = sshpkt_put_cstring(ssh, sig2name(WTERMSIG(status)))) != 0 ||
2068: (r = sshpkt_put_u8(ssh, WCOREDUMP(status)? 1 : 0)) != 0 ||
2069: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
2070: (r = sshpkt_put_cstring(ssh, "")) != 0 ||
2071: (r = sshpkt_send(ssh)) != 0)
2072: sshpkt_fatal(ssh, r, "%s: exit reply", __func__);
1.2 markus 2073: } else {
2074: /* Some weird exit cause. Just exit. */
1.312 djm 2075: ssh_packet_disconnect(ssh, "wait returned status %04x.", status);
1.2 markus 2076: }
2077:
2078: /* disconnect channel */
1.325 djm 2079: debug_f("release channel %d", s->chanid);
1.187 djm 2080:
2081: /*
2082: * Adjust cleanup callback attachment to send close messages when
1.199 deraadt 2083: * the channel gets EOF. The session will be then be closed
1.319 djm 2084: * by session_close_by_channel when the child sessions close their fds.
1.187 djm 2085: */
1.292 djm 2086: channel_register_cleanup(ssh, c->self, session_close_by_channel, 1);
1.187 djm 2087:
1.5 markus 2088: /*
2089: * emulate a write failure with 'chan_write_failed', nobody will be
2090: * interested in data we write.
2091: * Note that we must not call 'chan_read_failed', since there could
2092: * be some more data waiting in the pipe.
2093: */
1.8 markus 2094: if (c->ostate != CHAN_OUTPUT_CLOSED)
1.292 djm 2095: chan_write_failed(ssh, c);
1.2 markus 2096: }
2097:
1.130 provos 2098: void
1.292 djm 2099: session_close(struct ssh *ssh, Session *s)
1.2 markus 2100: {
1.182 djm 2101: u_int i;
1.173 djm 2102:
1.280 djm 2103: verbose("Close session: user %s from %.200s port %d id %d",
2104: s->pw->pw_name,
1.281 djm 2105: ssh_remote_ipaddr(ssh),
2106: ssh_remote_port(ssh),
1.280 djm 2107: s->self);
2108:
1.165 markus 2109: if (s->ttyfd != -1)
1.85 markus 2110: session_pty_cleanup(s);
1.265 djm 2111: free(s->term);
2112: free(s->display);
2113: free(s->x11_chanids);
2114: free(s->auth_display);
2115: free(s->auth_data);
2116: free(s->auth_proto);
1.267 djm 2117: free(s->subsys);
1.219 djm 2118: if (s->env != NULL) {
2119: for (i = 0; i < s->num_env; i++) {
1.265 djm 2120: free(s->env[i].name);
2121: free(s->env[i].val);
1.219 djm 2122: }
1.265 djm 2123: free(s->env);
1.173 djm 2124: }
1.9 markus 2125: session_proctitle(s);
1.237 djm 2126: session_unused(s->self);
1.2 markus 2127: }
2128:
2129: void
1.292 djm 2130: session_close_by_pid(struct ssh *ssh, pid_t pid, int status)
1.2 markus 2131: {
2132: Session *s = session_by_pid(pid);
2133: if (s == NULL) {
1.325 djm 2134: debug_f("no session for pid %ld", (long)pid);
1.2 markus 2135: return;
2136: }
2137: if (s->chanid != -1)
1.292 djm 2138: session_exit_message(ssh, s, status);
1.187 djm 2139: if (s->ttyfd != -1)
2140: session_pty_cleanup(s);
1.197 djm 2141: s->pid = 0;
1.98 markus 2142: }
2143:
1.2 markus 2144: /*
2145: * this is called when a channel dies before
2146: * the session 'child' itself dies
2147: */
2148: void
1.292 djm 2149: session_close_by_channel(struct ssh *ssh, int id, void *arg)
1.2 markus 2150: {
2151: Session *s = session_by_channel(id);
1.187 djm 2152: u_int i;
1.184 djm 2153:
1.2 markus 2154: if (s == NULL) {
1.325 djm 2155: debug_f("no session for id %d", id);
1.2 markus 2156: return;
2157: }
1.325 djm 2158: debug_f("channel %d child %ld", id, (long)s->pid);
1.107 markus 2159: if (s->pid != 0) {
1.325 djm 2160: debug_f("channel %d: has child, ttyfd %d", id, s->ttyfd);
1.108 markus 2161: /*
2162: * delay detach of session, but release pty, since
2163: * the fd's to the child are already closed
2164: */
1.165 markus 2165: if (s->ttyfd != -1)
1.108 markus 2166: session_pty_cleanup(s);
1.107 markus 2167: return;
2168: }
2169: /* detach by removing callback */
1.292 djm 2170: channel_cancel_cleanup(ssh, s->chanid);
1.187 djm 2171:
2172: /* Close any X11 listeners associated with this session */
2173: if (s->x11_chanids != NULL) {
2174: for (i = 0; s->x11_chanids[i] != -1; i++) {
1.292 djm 2175: session_close_x11(ssh, s->x11_chanids[i]);
1.187 djm 2176: s->x11_chanids[i] = -1;
2177: }
2178: }
2179:
1.2 markus 2180: s->chanid = -1;
1.292 djm 2181: session_close(ssh, s);
1.106 markus 2182: }
2183:
2184: void
1.292 djm 2185: session_destroy_all(struct ssh *ssh, void (*closefunc)(Session *))
1.106 markus 2186: {
2187: int i;
1.237 djm 2188: for (i = 0; i < sessions_nalloc; i++) {
1.106 markus 2189: Session *s = &sessions[i];
1.130 provos 2190: if (s->used) {
2191: if (closefunc != NULL)
2192: closefunc(s);
2193: else
1.292 djm 2194: session_close(ssh, s);
1.130 provos 2195: }
1.2 markus 2196: }
1.9 markus 2197: }
2198:
1.94 itojun 2199: static char *
1.9 markus 2200: session_tty_list(void)
2201: {
2202: static char buf[1024];
2203: int i;
2204: buf[0] = '\0';
1.237 djm 2205: for (i = 0; i < sessions_nalloc; i++) {
1.9 markus 2206: Session *s = &sessions[i];
2207: if (s->used && s->ttyfd != -1) {
2208: if (buf[0] != '\0')
2209: strlcat(buf, ",", sizeof buf);
2210: strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
2211: }
2212: }
2213: if (buf[0] == '\0')
2214: strlcpy(buf, "notty", sizeof buf);
2215: return buf;
2216: }
2217:
2218: void
2219: session_proctitle(Session *s)
2220: {
2221: if (s->pw == NULL)
2222: error("no user for session %d", s->self);
2223: else
2224: setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
1.81 markus 2225: }
2226:
2227: int
1.292 djm 2228: session_setup_x11fwd(struct ssh *ssh, Session *s)
1.81 markus 2229: {
2230: struct stat st;
1.109 stevesk 2231: char display[512], auth_display[512];
1.272 djm 2232: char hostname[NI_MAXHOST];
1.184 djm 2233: u_int i;
1.81 markus 2234:
1.294 djm 2235: if (!auth_opts->permit_x11_forwarding_flag) {
1.312 djm 2236: ssh_packet_send_debug(ssh, "X11 forwarding disabled by key options.");
1.81 markus 2237: return 0;
2238: }
2239: if (!options.x11_forwarding) {
2240: debug("X11 forwarding disabled in server configuration file.");
2241: return 0;
2242: }
1.275 djm 2243: if (options.xauth_location == NULL ||
1.81 markus 2244: (stat(options.xauth_location, &st) == -1)) {
1.312 djm 2245: ssh_packet_send_debug(ssh, "No xauth program; cannot forward X11.");
1.81 markus 2246: return 0;
2247: }
1.87 markus 2248: if (s->display != NULL) {
1.81 markus 2249: debug("X11 display already set.");
2250: return 0;
2251: }
1.292 djm 2252: if (x11_create_display_inet(ssh, options.x11_display_offset,
1.140 deraadt 2253: options.x11_use_localhost, s->single_connection,
1.184 djm 2254: &s->display_number, &s->x11_chanids) == -1) {
1.87 markus 2255: debug("x11_create_display_inet failed.");
1.81 markus 2256: return 0;
1.184 djm 2257: }
2258: for (i = 0; s->x11_chanids[i] != -1; i++) {
1.292 djm 2259: channel_register_cleanup(ssh, s->x11_chanids[i],
1.187 djm 2260: session_close_single_x11, 0);
1.81 markus 2261: }
1.109 stevesk 2262:
2263: /* Set up a suitable value for the DISPLAY variable. */
1.316 deraadt 2264: if (gethostname(hostname, sizeof(hostname)) == -1)
1.109 stevesk 2265: fatal("gethostname: %.100s", strerror(errno));
2266: /*
2267: * auth_display must be used as the displayname when the
2268: * authorization entry is added with xauth(1). This will be
2269: * different than the DISPLAY string for localhost displays.
2270: */
1.119 stevesk 2271: if (options.x11_use_localhost) {
1.140 deraadt 2272: snprintf(display, sizeof display, "localhost:%u.%u",
1.109 stevesk 2273: s->display_number, s->screen);
1.140 deraadt 2274: snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
1.118 stevesk 2275: s->display_number, s->screen);
1.109 stevesk 2276: s->display = xstrdup(display);
1.118 stevesk 2277: s->auth_display = xstrdup(auth_display);
1.109 stevesk 2278: } else {
1.140 deraadt 2279: snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
1.109 stevesk 2280: s->display_number, s->screen);
2281: s->display = xstrdup(display);
1.118 stevesk 2282: s->auth_display = xstrdup(display);
1.109 stevesk 2283: }
2284:
1.81 markus 2285: return 1;
1.2 markus 2286: }
2287:
1.94 itojun 2288: static void
1.292 djm 2289: do_authenticated2(struct ssh *ssh, Authctxt *authctxt)
1.2 markus 2290: {
1.292 djm 2291: server_loop2(ssh, authctxt);
1.165 markus 2292: }
2293:
2294: void
1.292 djm 2295: do_cleanup(struct ssh *ssh, Authctxt *authctxt)
1.165 markus 2296: {
2297: static int called = 0;
2298:
2299: debug("do_cleanup");
2300:
2301: /* no cleanup if we're in the child for login shell */
2302: if (is_child)
2303: return;
2304:
2305: /* avoid double cleanup */
2306: if (called)
2307: return;
2308: called = 1;
2309:
1.218 markus 2310: if (authctxt == NULL || !authctxt->authenticated)
1.165 markus 2311: return;
2312: #ifdef KRB5
2313: if (options.kerberos_ticket_cleanup &&
2314: authctxt->krb5_ctx)
2315: krb5_cleanup_proc(authctxt);
1.161 markus 2316: #endif
1.165 markus 2317:
2318: #ifdef GSSAPI
1.283 markus 2319: if (options.gss_cleanup_creds)
1.165 markus 2320: ssh_gssapi_cleanup_creds();
2321: #endif
2322:
2323: /* remove agent socket */
2324: auth_sock_cleanup_proc(authctxt->pw);
1.290 djm 2325:
2326: /* remove userauth info */
2327: if (auth_info_file != NULL) {
2328: temporarily_use_uid(authctxt->pw);
2329: unlink(auth_info_file);
2330: restore_uid();
2331: free(auth_info_file);
2332: auth_info_file = NULL;
2333: }
1.165 markus 2334:
2335: /*
2336: * Cleanup ptys/utmp only if privsep is disabled,
2337: * or if running in monitor.
2338: */
2339: if (!use_privsep || mm_is_monitor())
1.292 djm 2340: session_destroy_all(ssh, session_pty_cleanup2);
1.1 markus 2341: }
1.281 djm 2342:
2343: /* Return a name for the remote host that fits inside utmp_size */
2344:
2345: const char *
2346: session_get_remote_name_or_ip(struct ssh *ssh, u_int utmp_size, int use_dns)
2347: {
2348: const char *remote = "";
2349:
2350: if (utmp_size > 0)
2351: remote = auth_get_canonical_hostname(ssh, use_dns);
2352: if (utmp_size == 0 || strlen(remote) > utmp_size)
2353: remote = ssh_remote_ipaddr(ssh);
2354: return remote;
2355: }
2356: