]>
Commit | Line | Data |
---|---|---|
7368a6c8 | 1 | /* |
2 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
3 | * All rights reserved | |
bcbf86ec | 4 | * |
5 | * As far as I am concerned, the code I have written for this software | |
6 | * can be used freely for any purpose. Any derived versions of this | |
7 | * software must be clearly marked as such, and if the derived work is | |
8 | * incompatible with the protocol description in the RFC file, it must be | |
9 | * called by a name other than "ssh" or "Secure Shell". | |
10 | * | |
e78a59f5 | 11 | * SSH2 support by Markus Friedl. |
a96070d4 | 12 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
bcbf86ec | 13 | * |
14 | * Redistribution and use in source and binary forms, with or without | |
15 | * modification, are permitted provided that the following conditions | |
16 | * are met: | |
17 | * 1. Redistributions of source code must retain the above copyright | |
18 | * notice, this list of conditions and the following disclaimer. | |
19 | * 2. Redistributions in binary form must reproduce the above copyright | |
20 | * notice, this list of conditions and the following disclaimer in the | |
21 | * documentation and/or other materials provided with the distribution. | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
26 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
27 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
28 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
29 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
30 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
32 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
e78a59f5 | 33 | */ |
7368a6c8 | 34 | |
35 | #include "includes.h" | |
a96070d4 | 36 | RCSID("$OpenBSD: session.c,v 1.95 2001/06/25 08:25:39 markus Exp $"); |
7368a6c8 | 37 | |
7368a6c8 | 38 | #include "ssh.h" |
42f11eb2 | 39 | #include "ssh1.h" |
40 | #include "ssh2.h" | |
41 | #include "xmalloc.h" | |
1729c161 | 42 | #include "sshpty.h" |
7368a6c8 | 43 | #include "packet.h" |
44 | #include "buffer.h" | |
7368a6c8 | 45 | #include "mpaux.h" |
7368a6c8 | 46 | #include "uidswap.h" |
47 | #include "compat.h" | |
a5efa1bb | 48 | #include "channels.h" |
e78a59f5 | 49 | #include "bufaux.h" |
e78a59f5 | 50 | #include "auth.h" |
38c295d6 | 51 | #include "auth-options.h" |
42f11eb2 | 52 | #include "pathnames.h" |
53 | #include "log.h" | |
54 | #include "servconf.h" | |
1729c161 | 55 | #include "sshlogin.h" |
42f11eb2 | 56 | #include "serverloop.h" |
57 | #include "canohost.h" | |
5ca51e19 | 58 | #include "session.h" |
e78a59f5 | 59 | |
3206bb3b | 60 | #ifdef WITH_IRIX_PROJECT |
61 | #include <proj.h> | |
62 | #endif /* WITH_IRIX_PROJECT */ | |
d287c664 | 63 | #ifdef WITH_IRIX_JOBS |
64 | #include <sys/resource.h> | |
2b87da3b | 65 | #endif |
260d427b | 66 | #ifdef WITH_IRIX_AUDIT |
67 | #include <sat.h> | |
68 | #endif /* WITH_IRIX_AUDIT */ | |
3206bb3b | 69 | |
089fbbd2 | 70 | #if defined(HAVE_USERSEC_H) |
71 | #include <usersec.h> | |
72 | #endif | |
73 | ||
3c62e7eb | 74 | #ifdef HAVE_CYGWIN |
75 | #include <windows.h> | |
76 | #include <sys/cygwin.h> | |
77 | #define is_winnt (GetVersion() < 0x80000000) | |
78 | #endif | |
79 | ||
3fcce26c | 80 | /* AIX limits */ |
81 | #if defined(HAVE_GETUSERATTR) && !defined(S_UFSIZE_HARD) && defined(S_UFSIZE) | |
2a2cb9e7 | 82 | # define S_UFSIZE_HARD S_UFSIZE "_hard" |
83 | # define S_UCPU_HARD S_UCPU "_hard" | |
84 | # define S_UDATA_HARD S_UDATA "_hard" | |
85 | # define S_USTACK_HARD S_USTACK "_hard" | |
86 | # define S_URSS_HARD S_URSS "_hard" | |
87 | # define S_UCORE_HARD S_UCORE "_hard" | |
88 | # define S_UNOFILE_HARD S_UNOFILE "_hard" | |
3fcce26c | 89 | #endif |
90 | ||
8a968c25 | 91 | #ifdef _AIX |
92 | # include <uinfo.h> | |
93 | #endif | |
94 | ||
7368a6c8 | 95 | /* types */ |
96 | ||
97 | #define TTYSZ 64 | |
98 | typedef struct Session Session; | |
99 | struct Session { | |
100 | int used; | |
101 | int self; | |
102 | struct passwd *pw; | |
103 | pid_t pid; | |
104 | /* tty */ | |
105 | char *term; | |
106 | int ptyfd, ttyfd, ptymaster; | |
107 | int row, col, xpixel, ypixel; | |
108 | char tty[TTYSZ]; | |
109 | /* X11 */ | |
110 | char *display; | |
111 | int screen; | |
112 | char *auth_proto; | |
113 | char *auth_data; | |
0b242b12 | 114 | int single_connection; |
7368a6c8 | 115 | /* proto 2 */ |
116 | int chanid; | |
e5d7a405 | 117 | int is_subsystem; |
7368a6c8 | 118 | }; |
119 | ||
120 | /* func */ | |
121 | ||
122 | Session *session_new(void); | |
396c147e | 123 | void session_set_fds(Session *, int, int, int); |
124 | static void session_pty_cleanup(void *); | |
125 | void session_proctitle(Session *); | |
126 | int session_setup_x11fwd(Session *); | |
127 | void do_exec_pty(Session *, const char *); | |
128 | void do_exec_no_pty(Session *, const char *); | |
129 | void do_exec(Session *, const char *); | |
130 | void do_login(Session *, const char *); | |
131 | void do_child(Session *, const char *); | |
f2c2fd71 | 132 | void do_motd(void); |
7368a6c8 | 133 | |
396c147e | 134 | static void do_authenticated1(Authctxt *); |
135 | static void do_authenticated2(Authctxt *); | |
136 | ||
137 | static void session_close(Session *); | |
138 | static int session_pty_req(Session *); | |
bb5639fe | 139 | |
7368a6c8 | 140 | /* import */ |
141 | extern ServerOptions options; | |
142 | extern char *__progname; | |
143 | extern int log_stderr; | |
144 | extern int debug_flag; | |
1e3b8b07 | 145 | extern u_int utmp_len; |
089fbbd2 | 146 | extern int startup_pipe; |
e78e738a | 147 | extern void destroy_sensitive_data(void); |
089fbbd2 | 148 | |
b5e300c2 | 149 | /* original command from peer. */ |
c95add71 | 150 | const char *original_command = NULL; |
b5e300c2 | 151 | |
7368a6c8 | 152 | /* data */ |
153 | #define MAX_SESSIONS 10 | |
154 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 155 | |
c1ef8333 | 156 | #ifdef WITH_AIXAUTHENTICATE |
157 | /* AIX's lastlogin message, set in auth1.c */ | |
158 | char *aixloginmsg; | |
159 | #endif /* WITH_AIXAUTHENTICATE */ | |
7368a6c8 | 160 | |
2e73a022 | 161 | #ifdef HAVE_LOGIN_CAP |
162 | static login_cap_t *lc; | |
163 | #endif | |
164 | ||
bb5639fe | 165 | void |
166 | do_authenticated(Authctxt *authctxt) | |
167 | { | |
168 | /* | |
169 | * Cancel the alarm we set to limit the time taken for | |
170 | * authentication. | |
171 | */ | |
172 | alarm(0); | |
173 | if (startup_pipe != -1) { | |
174 | close(startup_pipe); | |
175 | startup_pipe = -1; | |
176 | } | |
177 | #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD) | |
178 | if ((lc = login_getclass(authctxt->pw->pw_class)) == NULL) { | |
179 | error("unable to get login class"); | |
180 | return; | |
181 | } | |
e78e738a | 182 | #ifdef BSD_AUTH |
183 | if (auth_approval(NULL, lc, authctxt->pw->pw_name, "ssh") <= 0) { | |
184 | packet_disconnect("Approval failure for %s", | |
185 | authctxt->pw->pw_name); | |
186 | } | |
187 | #endif | |
bb5639fe | 188 | #endif |
189 | /* setup the channel layer */ | |
190 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
191 | channel_permit_all_opens(); | |
192 | ||
193 | if (compat20) | |
194 | do_authenticated2(authctxt); | |
195 | else | |
196 | do_authenticated1(authctxt); | |
e4f7282d | 197 | |
b44de2b1 | 198 | /* remove agent socket */ |
e4f7282d | 199 | if (auth_get_socket_name()) |
f0f32b8e | 200 | auth_sock_cleanup_proc(authctxt->pw); |
bb5639fe | 201 | } |
202 | ||
7368a6c8 | 203 | /* |
204 | * Prepares for an interactive session. This is called after the user has | |
205 | * been successfully authenticated. During this message exchange, pseudo | |
206 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
207 | * are requested, etc. | |
208 | */ | |
396c147e | 209 | static void |
bb5639fe | 210 | do_authenticated1(Authctxt *authctxt) |
7368a6c8 | 211 | { |
212 | Session *s; | |
7368a6c8 | 213 | char *command; |
653d5f86 | 214 | int success, type, plen, screen_flag; |
bb5639fe | 215 | int compression_level = 0, enable_compression_after_reply = 0; |
1e3b8b07 | 216 | u_int proto_len, data_len, dlen; |
7368a6c8 | 217 | |
218 | s = session_new(); | |
bb5639fe | 219 | s->pw = authctxt->pw; |
2e73a022 | 220 | |
7368a6c8 | 221 | /* |
222 | * We stay in this loop until the client requests to execute a shell | |
223 | * or a command. | |
224 | */ | |
225 | for (;;) { | |
bb5639fe | 226 | success = 0; |
7368a6c8 | 227 | |
228 | /* Get a packet from the client. */ | |
229 | type = packet_read(&plen); | |
230 | ||
231 | /* Process the packet. */ | |
232 | switch (type) { | |
233 | case SSH_CMSG_REQUEST_COMPRESSION: | |
234 | packet_integrity_check(plen, 4, type); | |
235 | compression_level = packet_get_int(); | |
236 | if (compression_level < 1 || compression_level > 9) { | |
237 | packet_send_debug("Received illegal compression level %d.", | |
238 | compression_level); | |
239 | break; | |
240 | } | |
241 | /* Enable compression after we have responded with SUCCESS. */ | |
242 | enable_compression_after_reply = 1; | |
243 | success = 1; | |
244 | break; | |
245 | ||
246 | case SSH_CMSG_REQUEST_PTY: | |
653d5f86 | 247 | success = session_pty_req(s); |
7368a6c8 | 248 | break; |
249 | ||
250 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
7368a6c8 | 251 | s->auth_proto = packet_get_string(&proto_len); |
252 | s->auth_data = packet_get_string(&data_len); | |
7368a6c8 | 253 | |
2af09193 | 254 | screen_flag = packet_get_protocol_flags() & |
255 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
256 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
257 | ||
258 | if (packet_remaining() == 4) { | |
259 | if (!screen_flag) | |
260 | debug2("Buggy client: " | |
261 | "X11 screen flag missing"); | |
7368a6c8 | 262 | s->screen = packet_get_int(); |
c8b058b4 | 263 | } else { |
7368a6c8 | 264 | s->screen = 0; |
c8b058b4 | 265 | } |
8dcd9d5c | 266 | packet_done(); |
267 | success = session_setup_x11fwd(s); | |
268 | if (!success) { | |
269 | xfree(s->auth_proto); | |
270 | xfree(s->auth_data); | |
1500bcdd | 271 | s->auth_proto = NULL; |
272 | s->auth_data = NULL; | |
7368a6c8 | 273 | } |
7368a6c8 | 274 | break; |
7368a6c8 | 275 | |
276 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
277 | if (no_agent_forwarding_flag || compat13) { | |
278 | debug("Authentication agent forwarding not permitted for this authentication."); | |
279 | break; | |
280 | } | |
281 | debug("Received authentication agent forwarding request."); | |
bb5639fe | 282 | success = auth_input_request_forwarding(s->pw); |
7368a6c8 | 283 | break; |
284 | ||
285 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
286 | if (no_port_forwarding_flag) { | |
287 | debug("Port forwarding not permitted for this authentication."); | |
288 | break; | |
289 | } | |
33de75a3 | 290 | if (!options.allow_tcp_forwarding) { |
291 | debug("Port forwarding not permitted."); | |
292 | break; | |
293 | } | |
7368a6c8 | 294 | debug("Received TCP/IP port forwarding request."); |
bb5639fe | 295 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 296 | success = 1; |
297 | break; | |
298 | ||
299 | case SSH_CMSG_MAX_PACKET_SIZE: | |
300 | if (packet_set_maxsize(packet_get_int()) > 0) | |
301 | success = 1; | |
302 | break; | |
303 | ||
304 | case SSH_CMSG_EXEC_SHELL: | |
305 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 306 | if (type == SSH_CMSG_EXEC_CMD) { |
307 | command = packet_get_string(&dlen); | |
308 | debug("Exec command '%.500s'", command); | |
c95add71 | 309 | do_exec(s, command); |
310 | xfree(command); | |
7368a6c8 | 311 | } else { |
c95add71 | 312 | do_exec(s, NULL); |
7368a6c8 | 313 | } |
c95add71 | 314 | packet_done(); |
fc2a1d28 | 315 | session_close(s); |
7368a6c8 | 316 | return; |
317 | ||
318 | default: | |
319 | /* | |
320 | * Any unknown messages in this phase are ignored, | |
321 | * and a failure message is returned. | |
322 | */ | |
323 | log("Unknown packet type received after authentication: %d", type); | |
324 | } | |
325 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
326 | packet_send(); | |
327 | packet_write_wait(); | |
328 | ||
329 | /* Enable compression now that we have replied if appropriate. */ | |
330 | if (enable_compression_after_reply) { | |
331 | enable_compression_after_reply = 0; | |
332 | packet_start_compression(compression_level); | |
333 | } | |
334 | } | |
335 | } | |
336 | ||
337 | /* | |
338 | * This is called to fork and execute a command when we have no tty. This | |
339 | * will call do_child from the child, and server_loop from the parent after | |
340 | * setting up file descriptors and such. | |
341 | */ | |
6ae2364d | 342 | void |
65068d16 | 343 | do_exec_no_pty(Session *s, const char *command) |
7368a6c8 | 344 | { |
345 | int pid; | |
346 | ||
347 | #ifdef USE_PIPES | |
348 | int pin[2], pout[2], perr[2]; | |
349 | /* Allocate pipes for communicating with the program. */ | |
350 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
351 | packet_disconnect("Could not create pipes: %.100s", | |
352 | strerror(errno)); | |
353 | #else /* USE_PIPES */ | |
354 | int inout[2], err[2]; | |
355 | /* Uses socket pairs to communicate with the program. */ | |
356 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
357 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
358 | packet_disconnect("Could not create socket pairs: %.100s", | |
359 | strerror(errno)); | |
360 | #endif /* USE_PIPES */ | |
361 | if (s == NULL) | |
362 | fatal("do_exec_no_pty: no session"); | |
363 | ||
1d1ffb87 | 364 | session_proctitle(s); |
7368a6c8 | 365 | |
b19d61d7 | 366 | #if defined(USE_PAM) |
78220944 | 367 | do_pam_session(s->pw->pw_name, NULL); |
9afbfcfa | 368 | do_pam_setcred(1); |
266140a8 | 369 | #endif /* USE_PAM */ |
370 | ||
7368a6c8 | 371 | /* Fork the child. */ |
372 | if ((pid = fork()) == 0) { | |
373 | /* Child. Reinitialize the log since the pid has changed. */ | |
374 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
375 | ||
376 | /* | |
377 | * Create a new session and process group since the 4.4BSD | |
378 | * setlogin() affects the entire process group. | |
379 | */ | |
380 | if (setsid() < 0) | |
381 | error("setsid failed: %.100s", strerror(errno)); | |
382 | ||
383 | #ifdef USE_PIPES | |
384 | /* | |
385 | * Redirect stdin. We close the parent side of the socket | |
386 | * pair, and make the child side the standard input. | |
387 | */ | |
388 | close(pin[1]); | |
389 | if (dup2(pin[0], 0) < 0) | |
390 | perror("dup2 stdin"); | |
391 | close(pin[0]); | |
392 | ||
393 | /* Redirect stdout. */ | |
394 | close(pout[0]); | |
395 | if (dup2(pout[1], 1) < 0) | |
396 | perror("dup2 stdout"); | |
397 | close(pout[1]); | |
398 | ||
399 | /* Redirect stderr. */ | |
400 | close(perr[0]); | |
401 | if (dup2(perr[1], 2) < 0) | |
402 | perror("dup2 stderr"); | |
403 | close(perr[1]); | |
404 | #else /* USE_PIPES */ | |
405 | /* | |
406 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
407 | * use the same socket, as some programs (particularly rdist) | |
408 | * seem to depend on it. | |
409 | */ | |
410 | close(inout[1]); | |
411 | close(err[1]); | |
412 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
413 | perror("dup2 stdin"); | |
414 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
415 | perror("dup2 stdout"); | |
416 | if (dup2(err[0], 2) < 0) /* stderr */ | |
417 | perror("dup2 stderr"); | |
418 | #endif /* USE_PIPES */ | |
419 | ||
420 | /* Do processing for the child (exec command etc). */ | |
56b3e9ce | 421 | do_child(s, command); |
7368a6c8 | 422 | /* NOTREACHED */ |
423 | } | |
3c62e7eb | 424 | #ifdef HAVE_CYGWIN |
425 | if (is_winnt) | |
426 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
427 | #endif | |
7368a6c8 | 428 | if (pid < 0) |
429 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
430 | s->pid = pid; | |
b5c334cc | 431 | /* Set interactive/non-interactive mode. */ |
432 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 433 | #ifdef USE_PIPES |
434 | /* We are the parent. Close the child sides of the pipes. */ | |
435 | close(pin[0]); | |
436 | close(pout[1]); | |
437 | close(perr[1]); | |
438 | ||
e78a59f5 | 439 | if (compat20) { |
e5d7a405 | 440 | session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]); |
e78a59f5 | 441 | } else { |
442 | /* Enter the interactive session. */ | |
443 | server_loop(pid, pin[1], pout[0], perr[0]); | |
e5d7a405 | 444 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
e78a59f5 | 445 | } |
7368a6c8 | 446 | #else /* USE_PIPES */ |
447 | /* We are the parent. Close the child sides of the socket pairs. */ | |
448 | close(inout[0]); | |
449 | close(err[0]); | |
450 | ||
451 | /* | |
452 | * Enter the interactive session. Note: server_loop must be able to | |
453 | * handle the case that fdin and fdout are the same. | |
454 | */ | |
e78a59f5 | 455 | if (compat20) { |
e5d7a405 | 456 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); |
e78a59f5 | 457 | } else { |
458 | server_loop(pid, inout[1], inout[1], err[1]); | |
459 | /* server_loop has closed inout[1] and err[1]. */ | |
460 | } | |
7368a6c8 | 461 | #endif /* USE_PIPES */ |
462 | } | |
463 | ||
464 | /* | |
465 | * This is called to fork and execute a command when we have a tty. This | |
466 | * will call do_child from the child, and server_loop from the parent after | |
467 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
468 | * lastlog, and other such operations. | |
469 | */ | |
6ae2364d | 470 | void |
65068d16 | 471 | do_exec_pty(Session *s, const char *command) |
7368a6c8 | 472 | { |
7368a6c8 | 473 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 474 | pid_t pid; |
7368a6c8 | 475 | |
476 | if (s == NULL) | |
477 | fatal("do_exec_pty: no session"); | |
478 | ptyfd = s->ptyfd; | |
479 | ttyfd = s->ttyfd; | |
480 | ||
b19d61d7 | 481 | #if defined(USE_PAM) |
bb5639fe | 482 | do_pam_session(s->pw->pw_name, s->tty); |
9afbfcfa | 483 | do_pam_setcred(1); |
27cf96de | 484 | #endif |
266140a8 | 485 | |
7368a6c8 | 486 | /* Fork the child. */ |
487 | if ((pid = fork()) == 0) { | |
c345cf9d | 488 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 489 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
490 | ||
491 | /* Close the master side of the pseudo tty. */ | |
492 | close(ptyfd); | |
493 | ||
494 | /* Make the pseudo tty our controlling tty. */ | |
495 | pty_make_controlling_tty(&ttyfd, s->tty); | |
496 | ||
497 | /* Redirect stdin from the pseudo tty. */ | |
498 | if (dup2(ttyfd, fileno(stdin)) < 0) | |
499 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
500 | ||
501 | /* Redirect stdout to the pseudo tty. */ | |
502 | if (dup2(ttyfd, fileno(stdout)) < 0) | |
503 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
504 | ||
505 | /* Redirect stderr to the pseudo tty. */ | |
506 | if (dup2(ttyfd, fileno(stderr)) < 0) | |
507 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
508 | ||
509 | /* Close the extra descriptor for the pseudo tty. */ | |
510 | close(ttyfd); | |
511 | ||
c345cf9d | 512 | /* record login, etc. similar to login(1) */ |
c96a4aaf | 513 | #ifndef HAVE_OSF_SIA |
a22aff1f | 514 | if (!(options.use_login && command == NULL)) |
515 | do_login(s, command); | |
7e2d5fa4 | 516 | # ifdef LOGIN_NEEDS_UTMPX |
517 | else | |
518 | do_pre_login(s); | |
519 | # endif | |
c96a4aaf | 520 | #endif |
7368a6c8 | 521 | |
7368a6c8 | 522 | /* Do common processing for the child, such as execing the command. */ |
56b3e9ce | 523 | do_child(s, command); |
7368a6c8 | 524 | /* NOTREACHED */ |
525 | } | |
3c62e7eb | 526 | #ifdef HAVE_CYGWIN |
527 | if (is_winnt) | |
528 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
529 | #endif | |
7368a6c8 | 530 | if (pid < 0) |
531 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
532 | s->pid = pid; | |
533 | ||
534 | /* Parent. Close the slave side of the pseudo tty. */ | |
535 | close(ttyfd); | |
536 | ||
537 | /* | |
538 | * Create another descriptor of the pty master side for use as the | |
539 | * standard input. We could use the original descriptor, but this | |
540 | * simplifies code in server_loop. The descriptor is bidirectional. | |
541 | */ | |
542 | fdout = dup(ptyfd); | |
543 | if (fdout < 0) | |
544 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
545 | ||
546 | /* we keep a reference to the pty master */ | |
547 | ptymaster = dup(ptyfd); | |
548 | if (ptymaster < 0) | |
549 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
550 | s->ptymaster = ptymaster; | |
551 | ||
552 | /* Enter interactive session. */ | |
b5c334cc | 553 | packet_set_interactive(1); |
e78a59f5 | 554 | if (compat20) { |
555 | session_set_fds(s, ptyfd, fdout, -1); | |
556 | } else { | |
557 | server_loop(pid, ptyfd, fdout, -1); | |
558 | /* server_loop _has_ closed ptyfd and fdout. */ | |
e78a59f5 | 559 | } |
7368a6c8 | 560 | } |
561 | ||
7e2d5fa4 | 562 | #ifdef LOGIN_NEEDS_UTMPX |
563 | void | |
564 | do_pre_login(Session *s) | |
565 | { | |
566 | socklen_t fromlen; | |
567 | struct sockaddr_storage from; | |
568 | pid_t pid = getpid(); | |
569 | ||
570 | /* | |
571 | * Get IP address of client. If the connection is not a socket, let | |
572 | * the address be 0.0.0.0. | |
573 | */ | |
574 | memset(&from, 0, sizeof(from)); | |
575 | if (packet_connection_is_on_socket()) { | |
576 | fromlen = sizeof(from); | |
577 | if (getpeername(packet_get_connection_in(), | |
578 | (struct sockaddr *) & from, &fromlen) < 0) { | |
579 | debug("getpeername: %.100s", strerror(errno)); | |
580 | fatal_cleanup(); | |
581 | } | |
582 | } | |
583 | ||
584 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
585 | get_remote_name_or_ip(utmp_len, options.reverse_mapping_check), | |
586 | (struct sockaddr *)&from); | |
587 | } | |
588 | #endif | |
589 | ||
dac6753b | 590 | /* |
591 | * This is called to fork and execute a command. If another command is | |
592 | * to be forced, execute that instead. | |
593 | */ | |
594 | void | |
595 | do_exec(Session *s, const char *command) | |
596 | { | |
597 | if (forced_command) { | |
598 | original_command = command; | |
599 | command = forced_command; | |
dac6753b | 600 | debug("Forced command '%.900s'", command); |
601 | } | |
602 | ||
603 | if (s->ttyfd != -1) | |
604 | do_exec_pty(s, command); | |
605 | else | |
606 | do_exec_no_pty(s, command); | |
607 | ||
c95add71 | 608 | original_command = NULL; |
dac6753b | 609 | } |
610 | ||
ab88181c | 611 | /* |
612 | * Check for quiet login, either .hushlogin or command given. | |
613 | */ | |
614 | static int | |
615 | check_quietlogin(Session *s, const char *command) | |
616 | { | |
617 | char buf[256]; | |
618 | struct passwd * pw = s->pw; | |
619 | struct stat st; | |
620 | ||
621 | /* Return 1 if .hushlogin exists or a command given. */ | |
622 | if (command != NULL) | |
623 | return 1; | |
624 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
625 | #ifdef HAVE_LOGIN_CAP | |
626 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
627 | return 1; | |
628 | #else | |
629 | if (stat(buf, &st) >= 0) | |
630 | return 1; | |
631 | #endif | |
632 | return 0; | |
633 | } | |
dac6753b | 634 | |
c345cf9d | 635 | /* administrative, login(1)-like work */ |
636 | void | |
a22aff1f | 637 | do_login(Session *s, const char *command) |
c345cf9d | 638 | { |
c345cf9d | 639 | char *time_string; |
b5e300c2 | 640 | char hostname[MAXHOSTNAMELEN]; |
c345cf9d | 641 | socklen_t fromlen; |
642 | struct sockaddr_storage from; | |
c345cf9d | 643 | time_t last_login_time; |
644 | struct passwd * pw = s->pw; | |
645 | pid_t pid = getpid(); | |
646 | ||
647 | /* | |
648 | * Get IP address of client. If the connection is not a socket, let | |
649 | * the address be 0.0.0.0. | |
650 | */ | |
651 | memset(&from, 0, sizeof(from)); | |
652 | if (packet_connection_is_on_socket()) { | |
653 | fromlen = sizeof(from); | |
654 | if (getpeername(packet_get_connection_in(), | |
655 | (struct sockaddr *) & from, &fromlen) < 0) { | |
656 | debug("getpeername: %.100s", strerror(errno)); | |
657 | fatal_cleanup(); | |
658 | } | |
659 | } | |
660 | ||
bcbf86ec | 661 | /* Get the time and hostname when the user last logged in. */ |
4f4648f9 | 662 | if (options.print_lastlog) { |
663 | hostname[0] = '\0'; | |
664 | last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name, | |
665 | hostname, sizeof(hostname)); | |
666 | } | |
bcbf86ec | 667 | |
c345cf9d | 668 | /* Record that there was a login on that tty from the remote host. */ |
669 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
46e3af7f | 670 | get_remote_name_or_ip(utmp_len, options.reverse_mapping_check), |
671 | (struct sockaddr *)&from); | |
c345cf9d | 672 | |
2919e060 | 673 | #ifdef USE_PAM |
674 | /* | |
675 | * If password change is needed, do it now. | |
676 | * This needs to occur before the ~/.hushlogin check. | |
677 | */ | |
e11aab29 | 678 | if (is_pam_password_change_required()) { |
2919e060 | 679 | print_pam_messages(); |
680 | do_pam_chauthtok(); | |
681 | } | |
682 | #endif | |
683 | ||
f2c2fd71 | 684 | if (check_quietlogin(s, command)) |
c345cf9d | 685 | return; |
686 | ||
687 | #ifdef USE_PAM | |
e11aab29 | 688 | if (!is_pam_password_change_required()) |
2919e060 | 689 | print_pam_messages(); |
c345cf9d | 690 | #endif /* USE_PAM */ |
691 | #ifdef WITH_AIXAUTHENTICATE | |
692 | if (aixloginmsg && *aixloginmsg) | |
693 | printf("%s\n", aixloginmsg); | |
694 | #endif /* WITH_AIXAUTHENTICATE */ | |
695 | ||
4f4648f9 | 696 | if (options.print_lastlog && last_login_time != 0) { |
c345cf9d | 697 | time_string = ctime(&last_login_time); |
698 | if (strchr(time_string, '\n')) | |
699 | *strchr(time_string, '\n') = 0; | |
f478712e | 700 | if (strcmp(hostname, "") == 0) |
c345cf9d | 701 | printf("Last login: %s\r\n", time_string); |
702 | else | |
bcbf86ec | 703 | printf("Last login: %s from %s\r\n", time_string, hostname); |
c345cf9d | 704 | } |
f2c2fd71 | 705 | |
706 | do_motd(); | |
707 | } | |
708 | ||
709 | /* | |
710 | * Display the message of the day. | |
711 | */ | |
712 | void | |
713 | do_motd(void) | |
714 | { | |
715 | FILE *f; | |
716 | char buf[256]; | |
717 | ||
c345cf9d | 718 | if (options.print_motd) { |
2e73a022 | 719 | #ifdef HAVE_LOGIN_CAP |
720 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
721 | "/etc/motd"), "r"); | |
722 | #else | |
c345cf9d | 723 | f = fopen("/etc/motd", "r"); |
2e73a022 | 724 | #endif |
c345cf9d | 725 | if (f) { |
726 | while (fgets(buf, sizeof(buf), f)) | |
727 | fputs(buf, stdout); | |
728 | fclose(f); | |
729 | } | |
730 | } | |
731 | } | |
732 | ||
7368a6c8 | 733 | /* |
734 | * Sets the value of the given variable in the environment. If the variable | |
735 | * already exists, its value is overriden. | |
736 | */ | |
396c147e | 737 | static void |
1e3b8b07 | 738 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
7368a6c8 | 739 | const char *value) |
740 | { | |
1e3b8b07 | 741 | u_int i, namelen; |
7368a6c8 | 742 | char **env; |
743 | ||
744 | /* | |
745 | * Find the slot where the value should be stored. If the variable | |
746 | * already exists, we reuse the slot; otherwise we append a new slot | |
747 | * at the end of the array, expanding if necessary. | |
748 | */ | |
749 | env = *envp; | |
750 | namelen = strlen(name); | |
751 | for (i = 0; env[i]; i++) | |
752 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
753 | break; | |
754 | if (env[i]) { | |
755 | /* Reuse the slot. */ | |
756 | xfree(env[i]); | |
757 | } else { | |
758 | /* New variable. Expand if necessary. */ | |
759 | if (i >= (*envsizep) - 1) { | |
760 | (*envsizep) += 50; | |
761 | env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *)); | |
762 | } | |
763 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
764 | env[i + 1] = NULL; | |
765 | } | |
766 | ||
767 | /* Allocate space and format the variable in the appropriate slot. */ | |
768 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
769 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
770 | } | |
771 | ||
772 | /* | |
773 | * Reads environment variables from the given file and adds/overrides them | |
774 | * into the environment. If the file does not exist, this does nothing. | |
775 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
776 | * and assignments of the form name=value. No other forms are allowed. | |
777 | */ | |
396c147e | 778 | static void |
1e3b8b07 | 779 | read_environment_file(char ***env, u_int *envsize, |
7368a6c8 | 780 | const char *filename) |
781 | { | |
782 | FILE *f; | |
783 | char buf[4096]; | |
784 | char *cp, *value; | |
785 | ||
786 | f = fopen(filename, "r"); | |
787 | if (!f) | |
788 | return; | |
789 | ||
790 | while (fgets(buf, sizeof(buf), f)) { | |
791 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) | |
792 | ; | |
793 | if (!*cp || *cp == '#' || *cp == '\n') | |
794 | continue; | |
795 | if (strchr(cp, '\n')) | |
796 | *strchr(cp, '\n') = '\0'; | |
797 | value = strchr(cp, '='); | |
798 | if (value == NULL) { | |
799 | fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf); | |
800 | continue; | |
801 | } | |
71276795 | 802 | /* |
803 | * Replace the equals sign by nul, and advance value to | |
804 | * the value string. | |
805 | */ | |
7368a6c8 | 806 | *value = '\0'; |
807 | value++; | |
808 | child_set_env(env, envsize, cp, value); | |
809 | } | |
810 | fclose(f); | |
811 | } | |
812 | ||
813 | #ifdef USE_PAM | |
814 | /* | |
815 | * Sets any environment variables which have been specified by PAM | |
816 | */ | |
16995a2c | 817 | void do_pam_environment(char ***env, u_int *envsize) |
7368a6c8 | 818 | { |
819 | char *equals, var_name[512], var_val[512]; | |
820 | char **pam_env; | |
821 | int i; | |
822 | ||
823 | if ((pam_env = fetch_pam_environment()) == NULL) | |
824 | return; | |
2b87da3b | 825 | |
7368a6c8 | 826 | for(i = 0; pam_env[i] != NULL; i++) { |
827 | if ((equals = strstr(pam_env[i], "=")) == NULL) | |
828 | continue; | |
2b87da3b | 829 | |
7368a6c8 | 830 | if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) { |
831 | memset(var_name, '\0', sizeof(var_name)); | |
832 | memset(var_val, '\0', sizeof(var_val)); | |
833 | ||
834 | strncpy(var_name, pam_env[i], equals - pam_env[i]); | |
835 | strcpy(var_val, equals + 1); | |
836 | ||
22d89d24 | 837 | debug3("PAM environment: %s=%s", var_name, var_val); |
7368a6c8 | 838 | |
839 | child_set_env(env, envsize, var_name, var_val); | |
840 | } | |
841 | } | |
842 | } | |
843 | #endif /* USE_PAM */ | |
844 | ||
22d89d24 | 845 | #ifdef HAVE_CYGWIN |
16995a2c | 846 | void copy_environment(char ***env, u_int *envsize) |
22d89d24 | 847 | { |
848 | char *equals, var_name[512], var_val[512]; | |
849 | int i; | |
850 | ||
851 | for(i = 0; environ[i] != NULL; i++) { | |
852 | if ((equals = strstr(environ[i], "=")) == NULL) | |
853 | continue; | |
2b87da3b | 854 | |
22d89d24 | 855 | if (strlen(environ[i]) < (sizeof(var_name) - 1)) { |
856 | memset(var_name, '\0', sizeof(var_name)); | |
857 | memset(var_val, '\0', sizeof(var_val)); | |
858 | ||
859 | strncpy(var_name, environ[i], equals - environ[i]); | |
860 | strcpy(var_val, equals + 1); | |
861 | ||
862 | debug3("Copy environment: %s=%s", var_name, var_val); | |
863 | ||
864 | child_set_env(env, envsize, var_name, var_val); | |
865 | } | |
866 | } | |
867 | } | |
868 | #endif | |
869 | ||
5fa45897 | 870 | #if defined(HAVE_GETUSERATTR) |
871 | /* | |
872 | * AIX-specific login initialisation | |
873 | */ | |
874 | void set_limit(char *user, char *soft, char *hard, int resource, int mult) | |
875 | { | |
876 | struct rlimit rlim; | |
56118702 | 877 | int slim, hlim; |
5fa45897 | 878 | |
879 | getrlimit(resource, &rlim); | |
880 | ||
56118702 | 881 | slim = 0; |
882 | if (getuserattr(user, soft, &slim, SEC_INT) != -1) { | |
883 | if (slim < 0) { | |
884 | rlim.rlim_cur = RLIM_INFINITY; | |
885 | } else if (slim != 0) { | |
886 | /* See the wackiness below */ | |
887 | if (rlim.rlim_cur == slim * mult) | |
888 | slim = 0; | |
889 | else | |
890 | rlim.rlim_cur = slim * mult; | |
891 | } | |
892 | } | |
5fa45897 | 893 | |
56118702 | 894 | hlim = 0; |
895 | if (getuserattr(user, hard, &hlim, SEC_INT) != -1) { | |
896 | if (hlim < 0) { | |
897 | rlim.rlim_max = RLIM_INFINITY; | |
898 | } else if (hlim != 0) { | |
899 | rlim.rlim_max = hlim * mult; | |
900 | } | |
901 | } | |
5fa45897 | 902 | |
56118702 | 903 | /* |
904 | * XXX For cpu and fsize the soft limit is set to the hard limit | |
905 | * if the hard limit is left at its default value and the soft limit | |
906 | * is changed from its default value, either by requesting it | |
907 | * (slim == 0) or by setting it to the current default. At least | |
908 | * that's how rlogind does it. If you're confused you're not alone. | |
909 | * Bug or feature? AIX 4.3.1.2 | |
910 | */ | |
911 | if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu")) | |
912 | && hlim == 0 && slim != 0) | |
913 | rlim.rlim_max = rlim.rlim_cur; | |
914 | /* A specified hard limit limits the soft limit */ | |
915 | else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max) | |
916 | rlim.rlim_cur = rlim.rlim_max; | |
917 | /* A soft limit can increase a hard limit */ | |
918 | else if (rlim.rlim_cur > rlim.rlim_max) | |
5fa45897 | 919 | rlim.rlim_max = rlim.rlim_cur; |
920 | ||
921 | if (setrlimit(resource, &rlim) != 0) | |
56118702 | 922 | error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno)); |
5fa45897 | 923 | } |
924 | ||
925 | void set_limits_from_userattr(char *user) | |
926 | { | |
927 | int mask; | |
928 | char buf[16]; | |
929 | ||
930 | set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512); | |
931 | set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1); | |
932 | set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512); | |
933 | set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512); | |
934 | set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512); | |
935 | set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512); | |
936 | #if defined(S_UNOFILE) | |
937 | set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1); | |
938 | #endif | |
939 | ||
940 | if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) { | |
941 | /* Convert decimal to octal */ | |
942 | (void) snprintf(buf, sizeof(buf), "%d", mask); | |
943 | if (sscanf(buf, "%o", &mask) == 1) | |
944 | umask(mask); | |
945 | } | |
946 | } | |
947 | #endif /* defined(HAVE_GETUSERATTR) */ | |
948 | ||
7368a6c8 | 949 | /* |
950 | * Performs common processing for the child, such as setting up the | |
951 | * environment, closing extra file descriptors, setting the user and group | |
952 | * ids, and executing the command or shell. | |
953 | */ | |
6ae2364d | 954 | void |
56b3e9ce | 955 | do_child(Session *s, const char *command) |
7368a6c8 | 956 | { |
b5e300c2 | 957 | const char *shell, *hostname = NULL, *cp = NULL; |
56b3e9ce | 958 | struct passwd * pw = s->pw; |
7368a6c8 | 959 | char buf[256]; |
6fc1e9f3 | 960 | char cmd[1024]; |
2e73a022 | 961 | FILE *f = NULL; |
1e3b8b07 | 962 | u_int envsize, i; |
7368a6c8 | 963 | char **env; |
964 | extern char **environ; | |
965 | struct stat st; | |
966 | char *argv[10]; | |
1500bcdd | 967 | int do_xauth; |
3206bb3b | 968 | #ifdef WITH_IRIX_PROJECT |
969 | prid_t projid; | |
970 | #endif /* WITH_IRIX_PROJECT */ | |
d287c664 | 971 | #ifdef WITH_IRIX_JOBS |
972 | jid_t jid = 0; | |
973 | #else | |
974 | #ifdef WITH_IRIX_ARRAY | |
975 | int jid = 0; | |
976 | #endif /* WITH_IRIX_ARRAY */ | |
977 | #endif /* WITH_IRIX_JOBS */ | |
978 | ||
1500bcdd | 979 | do_xauth = |
980 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
981 | ||
e78e738a | 982 | /* remove hostkey from the child's memory */ |
983 | destroy_sensitive_data(); | |
984 | ||
fa649821 | 985 | /* login(1) is only called if we execute the login shell */ |
986 | if (options.use_login && command != NULL) | |
987 | options.use_login = 0; | |
988 | ||
c96a4aaf | 989 | #if !defined(USE_PAM) && !defined(HAVE_OSF_SIA) |
2e73a022 | 990 | if (!options.use_login) { |
991 | # ifdef HAVE_LOGIN_CAP | |
992 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
993 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
994 | _PATH_NOLOGIN), "r"); | |
995 | # else /* HAVE_LOGIN_CAP */ | |
996 | if (pw->pw_uid) | |
997 | f = fopen(_PATH_NOLOGIN, "r"); | |
998 | # endif /* HAVE_LOGIN_CAP */ | |
999 | if (f) { | |
1000 | /* /etc/nologin exists. Print its contents and exit. */ | |
1001 | while (fgets(buf, sizeof(buf), f)) | |
1002 | fputs(buf, stderr); | |
1003 | fclose(f); | |
7368a6c8 | 1004 | exit(254); |
2e73a022 | 1005 | } |
7368a6c8 | 1006 | } |
c96a4aaf | 1007 | #endif /* USE_PAM || HAVE_OSF_SIA */ |
7368a6c8 | 1008 | |
2e73a022 | 1009 | /* Set login name, uid, gid, and groups. */ |
7368a6c8 | 1010 | /* Login(1) does this as well, and it needs uid 0 for the "-h" |
1011 | switch, so we let login(1) to this for us. */ | |
1012 | if (!options.use_login) { | |
4d33e531 | 1013 | #ifdef HAVE_OSF_SIA |
7a7101ec | 1014 | session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty); |
c96a4aaf | 1015 | if (!check_quietlogin(s, command)) |
1016 | do_motd(); | |
815800e1 | 1017 | #else /* HAVE_OSF_SIA */ |
3c62e7eb | 1018 | #ifdef HAVE_CYGWIN |
1019 | if (is_winnt) { | |
1020 | #else | |
7368a6c8 | 1021 | if (getuid() == 0 || geteuid() == 0) { |
3c62e7eb | 1022 | #endif |
2e73a022 | 1023 | # ifdef HAVE_GETUSERATTR |
5fa45897 | 1024 | set_limits_from_userattr(pw->pw_name); |
2e73a022 | 1025 | # endif /* HAVE_GETUSERATTR */ |
1026 | # ifdef HAVE_LOGIN_CAP | |
1027 | if (setusercontext(lc, pw, pw->pw_uid, | |
1028 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1029 | perror("unable to set user context"); | |
1030 | exit(1); | |
1031 | } | |
1032 | # else /* HAVE_LOGIN_CAP */ | |
73d6d7fa | 1033 | #if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) |
1034 | /* Sets login uid for accounting */ | |
1035 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1036 | error("setluid: %s", strerror(errno)); | |
1037 | #endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1038 | ||
2e73a022 | 1039 | if (setlogin(pw->pw_name) < 0) |
1040 | error("setlogin failed: %s", strerror(errno)); | |
7368a6c8 | 1041 | if (setgid(pw->pw_gid) < 0) { |
1042 | perror("setgid"); | |
1043 | exit(1); | |
1044 | } | |
1045 | /* Initialize the group list. */ | |
1046 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1047 | perror("initgroups"); | |
1048 | exit(1); | |
1049 | } | |
1050 | endgrent(); | |
9afbfcfa | 1051 | # ifdef USE_PAM |
1052 | /* | |
1053 | * PAM credentials may take the form of | |
1054 | * supplementary groups. These will have been | |
1055 | * wiped by the above initgroups() call. | |
1056 | * Reestablish them here. | |
1057 | */ | |
1058 | do_pam_setcred(0); | |
1059 | # endif /* USE_PAM */ | |
d287c664 | 1060 | # ifdef WITH_IRIX_JOBS |
1061 | jid = jlimit_startjob(pw->pw_name, pw->pw_uid, "interactive"); | |
1062 | if (jid == -1) { | |
1063 | fatal("Failed to create job container: %.100s", | |
1064 | strerror(errno)); | |
2b87da3b | 1065 | } |
d287c664 | 1066 | # endif /* WITH_IRIX_JOBS */ |
2e73a022 | 1067 | # ifdef WITH_IRIX_ARRAY |
3206bb3b | 1068 | /* initialize array session */ |
d287c664 | 1069 | if (jid == 0) { |
1070 | if (newarraysess() != 0) | |
1071 | fatal("Failed to set up new array session: %.100s", | |
1072 | strerror(errno)); | |
1073 | } | |
2e73a022 | 1074 | # endif /* WITH_IRIX_ARRAY */ |
1075 | # ifdef WITH_IRIX_PROJECT | |
3206bb3b | 1076 | /* initialize irix project info */ |
1077 | if ((projid = getdfltprojuser(pw->pw_name)) == -1) { | |
1078 | debug("Failed to get project id, using projid 0"); | |
1079 | projid = 0; | |
1080 | } | |
3206bb3b | 1081 | if (setprid(projid)) |
1082 | fatal("Failed to initialize project %d for %s: %.100s", | |
1083 | (int)projid, pw->pw_name, strerror(errno)); | |
2e73a022 | 1084 | # endif /* WITH_IRIX_PROJECT */ |
260d427b | 1085 | #ifdef WITH_IRIX_AUDIT |
1086 | if (sysconf(_SC_AUDIT)) { | |
1087 | debug("Setting sat id to %d", (int) pw->pw_uid); | |
1088 | if (satsetid(pw->pw_uid)) | |
1089 | debug("error setting satid: %.100s", strerror(errno)); | |
1090 | } | |
1091 | #endif /* WITH_IRIX_AUDIT */ | |
1092 | ||
8a968c25 | 1093 | #ifdef _AIX |
1094 | /* | |
1095 | * AIX has a "usrinfo" area where logname and | |
1096 | * other stuff is stored - a few applications | |
1097 | * actually use this and die if it's not set | |
1098 | */ | |
ee110bfb | 1099 | if (s->ttyfd == -1) |
1100 | s->tty[0] = '\0'; | |
f5f6020e | 1101 | cp = xmalloc(22 + strlen(s->tty) + |
8a968c25 | 1102 | 2 * strlen(pw->pw_name)); |
1103 | i = sprintf(cp, "LOGNAME=%s%cNAME=%s%cTTY=%s%c%c", | |
ee110bfb | 1104 | pw->pw_name, 0, pw->pw_name, 0, s->tty, 0, 0); |
8a968c25 | 1105 | if (usrinfo(SETUINFO, cp, i) == -1) |
1106 | fatal("Couldn't set usrinfo: %s", | |
1107 | strerror(errno)); | |
1108 | debug3("AIX/UsrInfo: set len %d", i); | |
1109 | xfree(cp); | |
1110 | #endif | |
1111 | ||
7368a6c8 | 1112 | /* Permanently switch to the desired uid. */ |
63bd8c36 | 1113 | permanently_set_uid(pw); |
2e73a022 | 1114 | # endif /* HAVE_LOGIN_CAP */ |
7368a6c8 | 1115 | } |
2e73a022 | 1116 | #endif /* HAVE_OSF_SIA */ |
1117 | ||
3c62e7eb | 1118 | #ifdef HAVE_CYGWIN |
1119 | if (is_winnt) | |
1120 | #endif | |
7368a6c8 | 1121 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
14a9a859 | 1122 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); |
7368a6c8 | 1123 | } |
1124 | /* | |
1125 | * Get the shell from the password data. An empty shell field is | |
1126 | * legal, and means /bin/sh. | |
1127 | */ | |
1128 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
2e73a022 | 1129 | #ifdef HAVE_LOGIN_CAP |
1130 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1131 | #endif | |
7368a6c8 | 1132 | |
1133 | #ifdef AFS | |
1134 | /* Try to get AFS tokens for the local cell. */ | |
1135 | if (k_hasafs()) { | |
1136 | char cell[64]; | |
1137 | ||
1138 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1139 | krb_afslog(cell, 0); | |
1140 | ||
1141 | krb_afslog(0, 0); | |
1142 | } | |
1143 | #endif /* AFS */ | |
1144 | ||
1145 | /* Initialize the environment. */ | |
1146 | envsize = 100; | |
1147 | env = xmalloc(envsize * sizeof(char *)); | |
1148 | env[0] = NULL; | |
1149 | ||
3c62e7eb | 1150 | #ifdef HAVE_CYGWIN |
1151 | /* | |
1152 | * The Windows environment contains some setting which are | |
1153 | * important for a running system. They must not be dropped. | |
1154 | */ | |
22d89d24 | 1155 | copy_environment(&env, &envsize); |
3c62e7eb | 1156 | #endif |
1157 | ||
7368a6c8 | 1158 | if (!options.use_login) { |
1159 | /* Set basic environment. */ | |
1160 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
1161 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
1162 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); | |
2e73a022 | 1163 | #ifdef HAVE_LOGIN_CAP |
1164 | (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH); | |
1165 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1166 | #else /* HAVE_LOGIN_CAP */ |
1167 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1168 | /* |
1169 | * There's no standard path on Windows. The path contains | |
1170 | * important components pointing to the system directories, | |
1171 | * needed for loading shared libraries. So the path better | |
1172 | * remains intact here. | |
1173 | */ | |
7368a6c8 | 1174 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); |
22d89d24 | 1175 | # endif /* HAVE_CYGWIN */ |
1176 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1177 | |
1178 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1179 | _PATH_MAILDIR, pw->pw_name); | |
1180 | child_set_env(&env, &envsize, "MAIL", buf); | |
1181 | ||
1182 | /* Normal systems set SHELL by default. */ | |
1183 | child_set_env(&env, &envsize, "SHELL", shell); | |
1184 | } | |
1185 | if (getenv("TZ")) | |
1186 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1187 | ||
1188 | /* Set custom environment options from RSA authentication. */ | |
1189 | while (custom_environment) { | |
1190 | struct envstring *ce = custom_environment; | |
1191 | char *s = ce->s; | |
1192 | int i; | |
1193 | for (i = 0; s[i] != '=' && s[i]; i++); | |
1194 | if (s[i] == '=') { | |
1195 | s[i] = 0; | |
1196 | child_set_env(&env, &envsize, s, s + i + 1); | |
1197 | } | |
1198 | custom_environment = ce->next; | |
1199 | xfree(ce->s); | |
1200 | xfree(ce); | |
1201 | } | |
1202 | ||
1203 | snprintf(buf, sizeof buf, "%.50s %d %d", | |
1204 | get_remote_ipaddr(), get_remote_port(), get_local_port()); | |
1205 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); | |
1206 | ||
56b3e9ce | 1207 | if (s->ttyfd != -1) |
1208 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1209 | if (s->term) | |
1210 | child_set_env(&env, &envsize, "TERM", s->term); | |
1211 | if (s->display) | |
1212 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
b5e300c2 | 1213 | if (original_command) |
1214 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1215 | original_command); | |
7368a6c8 | 1216 | |
1217 | #ifdef _AIX | |
22d89d24 | 1218 | if ((cp = getenv("AUTHSTATE")) != NULL) |
1219 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1220 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1221 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1222 | read_environment_file(&env, &envsize, "/etc/environment"); | |
7368a6c8 | 1223 | #endif |
1224 | ||
1225 | #ifdef KRB4 | |
1226 | { | |
1227 | extern char *ticket; | |
1228 | ||
1229 | if (ticket) | |
1230 | child_set_env(&env, &envsize, "KRBTKFILE", ticket); | |
1231 | } | |
1232 | #endif /* KRB4 */ | |
1233 | ||
1234 | #ifdef USE_PAM | |
1235 | /* Pull in any environment variables that may have been set by PAM. */ | |
1236 | do_pam_environment(&env, &envsize); | |
1237 | #endif /* USE_PAM */ | |
1238 | ||
7368a6c8 | 1239 | if (auth_get_socket_name() != NULL) |
1240 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, | |
1241 | auth_get_socket_name()); | |
1242 | ||
1243 | /* read $HOME/.ssh/environment. */ | |
1244 | if (!options.use_login) { | |
71276795 | 1245 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
1246 | pw->pw_dir); | |
7368a6c8 | 1247 | read_environment_file(&env, &envsize, buf); |
1248 | } | |
1249 | if (debug_flag) { | |
1250 | /* dump the environment */ | |
1251 | fprintf(stderr, "Environment:\n"); | |
1252 | for (i = 0; env[i]; i++) | |
1253 | fprintf(stderr, " %.200s\n", env[i]); | |
1254 | } | |
2e73a022 | 1255 | /* we have to stash the hostname before we close our socket. */ |
1256 | if (options.use_login) | |
46e3af7f | 1257 | hostname = get_remote_name_or_ip(utmp_len, |
1258 | options.reverse_mapping_check); | |
7368a6c8 | 1259 | /* |
1260 | * Close the connection descriptors; note that this is the child, and | |
1261 | * the server will still have the socket open, and it is important | |
1262 | * that we do not shutdown it. Note that the descriptors cannot be | |
1263 | * closed before building the environment, as we call | |
1264 | * get_remote_ipaddr there. | |
1265 | */ | |
1266 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1267 | close(packet_get_connection_in()); | |
1268 | else { | |
1269 | close(packet_get_connection_in()); | |
1270 | close(packet_get_connection_out()); | |
1271 | } | |
1272 | /* | |
1273 | * Close all descriptors related to channels. They will still remain | |
1274 | * open in the parent. | |
1275 | */ | |
1276 | /* XXX better use close-on-exec? -markus */ | |
1277 | channel_close_all(); | |
1278 | ||
1279 | /* | |
1280 | * Close any extra file descriptors. Note that there may still be | |
1281 | * descriptors left by system functions. They will be closed later. | |
1282 | */ | |
1283 | endpwent(); | |
1284 | ||
1285 | /* | |
1286 | * Close any extra open file descriptors so that we don\'t have them | |
1287 | * hanging around in clients. Note that we want to do this after | |
1288 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1289 | * descriptors open. | |
1290 | */ | |
1291 | for (i = 3; i < 64; i++) | |
1292 | close(i); | |
1293 | ||
1294 | /* Change current directory to the user\'s home directory. */ | |
2e73a022 | 1295 | if (chdir(pw->pw_dir) < 0) { |
7368a6c8 | 1296 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", |
1297 | pw->pw_dir, strerror(errno)); | |
2e73a022 | 1298 | #ifdef HAVE_LOGIN_CAP |
1299 | if (login_getcapbool(lc, "requirehome", 0)) | |
1300 | exit(1); | |
1301 | #endif | |
1302 | } | |
7368a6c8 | 1303 | |
1304 | /* | |
1305 | * Must take new environment into use so that .ssh/rc, /etc/sshrc and | |
1306 | * xauth are run in the proper environment. | |
1307 | */ | |
1308 | environ = env; | |
1309 | ||
1310 | /* | |
1311 | * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first | |
1312 | * in this order). | |
1313 | */ | |
1314 | if (!options.use_login) { | |
e78e738a | 1315 | /* ignore _PATH_SSH_USER_RC for subsystems */ |
1316 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
503e7e5b | 1317 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", |
1318 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
7368a6c8 | 1319 | if (debug_flag) |
503e7e5b | 1320 | fprintf(stderr, "Running %s\n", cmd); |
1321 | f = popen(cmd, "w"); | |
7368a6c8 | 1322 | if (f) { |
56b3e9ce | 1323 | if (do_xauth) |
1324 | fprintf(f, "%s %s\n", s->auth_proto, | |
1325 | s->auth_data); | |
7368a6c8 | 1326 | pclose(f); |
1327 | } else | |
96c63318 | 1328 | fprintf(stderr, "Could not run %s\n", |
56b3e9ce | 1329 | _PATH_SSH_USER_RC); |
42f11eb2 | 1330 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { |
7368a6c8 | 1331 | if (debug_flag) |
56b3e9ce | 1332 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, |
1333 | _PATH_SSH_SYSTEM_RC); | |
42f11eb2 | 1334 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); |
7368a6c8 | 1335 | if (f) { |
56b3e9ce | 1336 | if (do_xauth) |
1337 | fprintf(f, "%s %s\n", s->auth_proto, | |
1338 | s->auth_data); | |
7368a6c8 | 1339 | pclose(f); |
1340 | } else | |
56b3e9ce | 1341 | fprintf(stderr, "Could not run %s\n", |
1342 | _PATH_SSH_SYSTEM_RC); | |
1343 | } else if (do_xauth && options.xauth_location != NULL) { | |
7368a6c8 | 1344 | /* Add authority data to .Xauthority if appropriate. */ |
56b3e9ce | 1345 | char *screen = strchr(s->display, ':'); |
1346 | ||
1347 | if (debug_flag) { | |
1348 | fprintf(stderr, | |
1349 | "Running %.100s add " | |
1350 | "%.100s %.100s %.100s\n", | |
1351 | options.xauth_location, s->display, | |
1352 | s->auth_proto, s->auth_data); | |
1353 | if (screen != NULL) | |
71276795 | 1354 | fprintf(stderr, |
56b3e9ce | 1355 | "Adding %.*s/unix%s %s %s\n", |
1356 | (int)(screen - s->display), | |
1357 | s->display, screen, | |
1358 | s->auth_proto, s->auth_data); | |
1359 | } | |
1360 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1361 | options.xauth_location); | |
1362 | f = popen(cmd, "w"); | |
1363 | if (f) { | |
1364 | fprintf(f, "add %s %s %s\n", s->display, | |
1365 | s->auth_proto, s->auth_data); | |
1366 | if (screen != NULL) | |
1367 | fprintf(f, "add %.*s/unix%s %s %s\n", | |
1368 | (int)(screen - s->display), | |
1369 | s->display, screen, | |
1370 | s->auth_proto, | |
1371 | s->auth_data); | |
1372 | pclose(f); | |
1373 | } else { | |
1374 | fprintf(stderr, "Could not run %s\n", | |
1375 | cmd); | |
7368a6c8 | 1376 | } |
1377 | } | |
7368a6c8 | 1378 | /* Get the last component of the shell name. */ |
1379 | cp = strrchr(shell, '/'); | |
1380 | if (cp) | |
1381 | cp++; | |
1382 | else | |
1383 | cp = shell; | |
1384 | } | |
1d3c30db | 1385 | |
1386 | /* restore SIGPIPE for child */ | |
1387 | signal(SIGPIPE, SIG_DFL); | |
1388 | ||
7368a6c8 | 1389 | /* |
1390 | * If we have no command, execute the shell. In this case, the shell | |
1391 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1392 | * this is a login shell. | |
1393 | */ | |
1394 | if (!command) { | |
1395 | if (!options.use_login) { | |
1396 | char buf[256]; | |
1397 | ||
1398 | /* | |
1399 | * Check for mail if we have a tty and it was enabled | |
1400 | * in server options. | |
1401 | */ | |
56b3e9ce | 1402 | if (s->ttyfd != -1 && options.check_mail) { |
7368a6c8 | 1403 | char *mailbox; |
1404 | struct stat mailstat; | |
56b3e9ce | 1405 | |
7368a6c8 | 1406 | mailbox = getenv("MAIL"); |
1407 | if (mailbox != NULL) { | |
71276795 | 1408 | if (stat(mailbox, &mailstat) != 0 || |
1409 | mailstat.st_size == 0) | |
7368a6c8 | 1410 | printf("No mail.\n"); |
1411 | else if (mailstat.st_mtime < mailstat.st_atime) | |
1412 | printf("You have mail.\n"); | |
1413 | else | |
1414 | printf("You have new mail.\n"); | |
1415 | } | |
1416 | } | |
1417 | /* Start the shell. Set initial character to '-'. */ | |
1418 | buf[0] = '-'; | |
1419 | strncpy(buf + 1, cp, sizeof(buf) - 1); | |
1420 | buf[sizeof(buf) - 1] = 0; | |
1421 | ||
1422 | /* Execute the shell. */ | |
1423 | argv[0] = buf; | |
1424 | argv[1] = NULL; | |
1425 | execve(shell, argv, env); | |
1426 | ||
1427 | /* Executing the shell failed. */ | |
1428 | perror(shell); | |
1429 | exit(1); | |
1430 | ||
1431 | } else { | |
1432 | /* Launch login(1). */ | |
1433 | ||
2e73a022 | 1434 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
7e2d5fa4 | 1435 | #ifdef LOGIN_NEEDS_TERM |
1436 | s->term? s->term : "unknown", | |
1437 | #endif | |
c345cf9d | 1438 | "-p", "-f", "--", pw->pw_name, NULL); |
7368a6c8 | 1439 | |
1440 | /* Login couldn't be executed, die. */ | |
1441 | ||
1442 | perror("login"); | |
1443 | exit(1); | |
1444 | } | |
1445 | } | |
1446 | /* | |
1447 | * Execute the command using the user's shell. This uses the -c | |
1448 | * option to execute the command. | |
1449 | */ | |
1450 | argv[0] = (char *) cp; | |
1451 | argv[1] = "-c"; | |
1452 | argv[2] = (char *) command; | |
1453 | argv[3] = NULL; | |
1454 | execve(shell, argv, env); | |
1455 | perror(shell); | |
1456 | exit(1); | |
1457 | } | |
1458 | ||
1459 | Session * | |
1460 | session_new(void) | |
1461 | { | |
1462 | int i; | |
1463 | static int did_init = 0; | |
1464 | if (!did_init) { | |
1465 | debug("session_new: init"); | |
1466 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1467 | sessions[i].used = 0; | |
7368a6c8 | 1468 | } |
1469 | did_init = 1; | |
1470 | } | |
1471 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1472 | Session *s = &sessions[i]; | |
1473 | if (! s->used) { | |
690d0d7f | 1474 | memset(s, 0, sizeof(*s)); |
7368a6c8 | 1475 | s->chanid = -1; |
1476 | s->ptyfd = -1; | |
1477 | s->ttyfd = -1; | |
7368a6c8 | 1478 | s->used = 1; |
86066315 | 1479 | s->self = i; |
02323c45 | 1480 | debug("session_new: session %d", i); |
7368a6c8 | 1481 | return s; |
1482 | } | |
1483 | } | |
1484 | return NULL; | |
1485 | } | |
1486 | ||
396c147e | 1487 | static void |
7368a6c8 | 1488 | session_dump(void) |
1489 | { | |
1490 | int i; | |
1491 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1492 | Session *s = &sessions[i]; | |
1493 | debug("dump: used %d session %d %p channel %d pid %d", | |
1494 | s->used, | |
1495 | s->self, | |
1496 | s, | |
1497 | s->chanid, | |
1498 | s->pid); | |
1499 | } | |
1500 | } | |
1501 | ||
e78a59f5 | 1502 | int |
1503 | session_open(int chanid) | |
1504 | { | |
1505 | Session *s = session_new(); | |
1506 | debug("session_open: channel %d", chanid); | |
1507 | if (s == NULL) { | |
1508 | error("no more sessions"); | |
1509 | return 0; | |
1510 | } | |
e78a59f5 | 1511 | s->pw = auth_get_user(); |
1512 | if (s->pw == NULL) | |
0725ea77 | 1513 | fatal("no user for session %d", s->self); |
0b242b12 | 1514 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1515 | s->chanid = chanid; | |
e78a59f5 | 1516 | return 1; |
1517 | } | |
1518 | ||
396c147e | 1519 | static Session * |
e78a59f5 | 1520 | session_by_channel(int id) |
1521 | { | |
1522 | int i; | |
1523 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1524 | Session *s = &sessions[i]; | |
1525 | if (s->used && s->chanid == id) { | |
1526 | debug("session_by_channel: session %d channel %d", i, id); | |
1527 | return s; | |
1528 | } | |
1529 | } | |
1530 | debug("session_by_channel: unknown channel %d", id); | |
1531 | session_dump(); | |
1532 | return NULL; | |
1533 | } | |
1534 | ||
396c147e | 1535 | static Session * |
e78a59f5 | 1536 | session_by_pid(pid_t pid) |
1537 | { | |
1538 | int i; | |
1539 | debug("session_by_pid: pid %d", pid); | |
1540 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1541 | Session *s = &sessions[i]; | |
1542 | if (s->used && s->pid == pid) | |
1543 | return s; | |
1544 | } | |
1545 | error("session_by_pid: unknown pid %d", pid); | |
1546 | session_dump(); | |
1547 | return NULL; | |
1548 | } | |
1549 | ||
396c147e | 1550 | static int |
e78a59f5 | 1551 | session_window_change_req(Session *s) |
1552 | { | |
1553 | s->col = packet_get_int(); | |
1554 | s->row = packet_get_int(); | |
1555 | s->xpixel = packet_get_int(); | |
1556 | s->ypixel = packet_get_int(); | |
6ae2364d | 1557 | packet_done(); |
e78a59f5 | 1558 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1559 | return 1; | |
1560 | } | |
1561 | ||
396c147e | 1562 | static int |
e78a59f5 | 1563 | session_pty_req(Session *s) |
1564 | { | |
1e3b8b07 | 1565 | u_int len; |
30dcc918 | 1566 | int n_bytes; |
e78a59f5 | 1567 | |
653d5f86 | 1568 | if (no_pty_flag) { |
1569 | debug("Allocating a pty not permitted for this authentication."); | |
38c295d6 | 1570 | return 0; |
653d5f86 | 1571 | } |
1572 | if (s->ttyfd != -1) { | |
1573 | packet_disconnect("Protocol error: you already have a pty."); | |
6ae2364d | 1574 | return 0; |
653d5f86 | 1575 | } |
1576 | ||
e78a59f5 | 1577 | s->term = packet_get_string(&len); |
653d5f86 | 1578 | |
1579 | if (compat20) { | |
1580 | s->col = packet_get_int(); | |
1581 | s->row = packet_get_int(); | |
1582 | } else { | |
1583 | s->row = packet_get_int(); | |
1584 | s->col = packet_get_int(); | |
1585 | } | |
e78a59f5 | 1586 | s->xpixel = packet_get_int(); |
1587 | s->ypixel = packet_get_int(); | |
1588 | ||
1589 | if (strcmp(s->term, "") == 0) { | |
1590 | xfree(s->term); | |
1591 | s->term = NULL; | |
1592 | } | |
653d5f86 | 1593 | |
e78a59f5 | 1594 | /* Allocate a pty and open it. */ |
653d5f86 | 1595 | debug("Allocating pty."); |
e78a59f5 | 1596 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) { |
653d5f86 | 1597 | if (s->term) |
1598 | xfree(s->term); | |
e78a59f5 | 1599 | s->term = NULL; |
1600 | s->ptyfd = -1; | |
1601 | s->ttyfd = -1; | |
1602 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1603 | return 0; |
e78a59f5 | 1604 | } |
1605 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
653d5f86 | 1606 | |
1607 | /* for SSH1 the tty modes length is not given */ | |
1608 | if (!compat20) | |
1609 | n_bytes = packet_remaining(); | |
1610 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1611 | ||
e78a59f5 | 1612 | /* |
1613 | * Add a cleanup function to clear the utmp entry and record logout | |
1614 | * time in case we call fatal() (e.g., the connection gets closed). | |
1615 | */ | |
86066315 | 1616 | fatal_add_cleanup(session_pty_cleanup, (void *)s); |
e78a59f5 | 1617 | pty_setowner(s->pw, s->tty); |
653d5f86 | 1618 | |
1619 | /* Set window size from the packet. */ | |
e78a59f5 | 1620 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1621 | ||
30dcc918 | 1622 | packet_done(); |
1d1ffb87 | 1623 | session_proctitle(s); |
e78a59f5 | 1624 | return 1; |
1625 | } | |
1626 | ||
396c147e | 1627 | static int |
0b242b12 | 1628 | session_subsystem_req(Session *s) |
1629 | { | |
1e3b8b07 | 1630 | u_int len; |
0b242b12 | 1631 | int success = 0; |
1632 | char *subsys = packet_get_string(&len); | |
38c295d6 | 1633 | int i; |
0b242b12 | 1634 | |
1635 | packet_done(); | |
1636 | log("subsystem request for %s", subsys); | |
1637 | ||
38c295d6 | 1638 | for (i = 0; i < options.num_subsystems; i++) { |
1639 | if(strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1640 | debug("subsystem: exec() %s", options.subsystem_command[i]); | |
e5d7a405 | 1641 | s->is_subsystem = 1; |
65068d16 | 1642 | do_exec_no_pty(s, options.subsystem_command[i]); |
38c295d6 | 1643 | success = 1; |
1644 | } | |
1645 | } | |
1646 | ||
1647 | if (!success) | |
1648 | log("subsystem request for %s failed, subsystem not found", subsys); | |
1649 | ||
0b242b12 | 1650 | xfree(subsys); |
1651 | return success; | |
1652 | } | |
1653 | ||
396c147e | 1654 | static int |
0b242b12 | 1655 | session_x11_req(Session *s) |
1656 | { | |
8dcd9d5c | 1657 | int success; |
0b242b12 | 1658 | |
1659 | s->single_connection = packet_get_char(); | |
1660 | s->auth_proto = packet_get_string(NULL); | |
1661 | s->auth_data = packet_get_string(NULL); | |
1662 | s->screen = packet_get_int(); | |
1663 | packet_done(); | |
1664 | ||
8dcd9d5c | 1665 | success = session_setup_x11fwd(s); |
1666 | if (!success) { | |
0b242b12 | 1667 | xfree(s->auth_proto); |
1668 | xfree(s->auth_data); | |
1500bcdd | 1669 | s->auth_proto = NULL; |
1670 | s->auth_data = NULL; | |
0b242b12 | 1671 | } |
8dcd9d5c | 1672 | return success; |
0b242b12 | 1673 | } |
1674 | ||
396c147e | 1675 | static int |
38c295d6 | 1676 | session_shell_req(Session *s) |
1677 | { | |
38c295d6 | 1678 | packet_done(); |
dac6753b | 1679 | do_exec(s, NULL); |
38c295d6 | 1680 | return 1; |
1681 | } | |
1682 | ||
396c147e | 1683 | static int |
38c295d6 | 1684 | session_exec_req(Session *s) |
1685 | { | |
1e3b8b07 | 1686 | u_int len; |
38c295d6 | 1687 | char *command = packet_get_string(&len); |
1688 | packet_done(); | |
dac6753b | 1689 | do_exec(s, command); |
c95add71 | 1690 | xfree(command); |
38c295d6 | 1691 | return 1; |
1692 | } | |
1693 | ||
396c147e | 1694 | static int |
fa08c86b | 1695 | session_auth_agent_req(Session *s) |
1696 | { | |
1697 | static int called = 0; | |
1698 | packet_done(); | |
d343d900 | 1699 | if (no_agent_forwarding_flag) { |
1700 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1701 | return 0; | |
1702 | } | |
fa08c86b | 1703 | if (called) { |
1704 | return 0; | |
1705 | } else { | |
1706 | called = 1; | |
1707 | return auth_input_request_forwarding(s->pw); | |
1708 | } | |
1709 | } | |
1710 | ||
e78a59f5 | 1711 | void |
1712 | session_input_channel_req(int id, void *arg) | |
1713 | { | |
1e3b8b07 | 1714 | u_int len; |
e78a59f5 | 1715 | int reply; |
1716 | int success = 0; | |
1717 | char *rtype; | |
1718 | Session *s; | |
1719 | Channel *c; | |
1720 | ||
1721 | rtype = packet_get_string(&len); | |
1722 | reply = packet_get_char(); | |
1723 | ||
1724 | s = session_by_channel(id); | |
1725 | if (s == NULL) | |
1726 | fatal("session_input_channel_req: channel %d: no session", id); | |
1727 | c = channel_lookup(id); | |
1728 | if (c == NULL) | |
1729 | fatal("session_input_channel_req: channel %d: bad channel", id); | |
1730 | ||
1731 | debug("session_input_channel_req: session %d channel %d request %s reply %d", | |
1732 | s->self, id, rtype, reply); | |
1733 | ||
1734 | /* | |
e5d7a405 | 1735 | * a session is in LARVAL state until a shell, a command |
1736 | * or a subsystem is executed | |
e78a59f5 | 1737 | */ |
1738 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1739 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1740 | success = session_shell_req(s); |
e78a59f5 | 1741 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1742 | success = session_exec_req(s); |
e78a59f5 | 1743 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1744 | success = session_pty_req(s); |
0b242b12 | 1745 | } else if (strcmp(rtype, "x11-req") == 0) { |
1746 | success = session_x11_req(s); | |
fa08c86b | 1747 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
1748 | success = session_auth_agent_req(s); | |
0b242b12 | 1749 | } else if (strcmp(rtype, "subsystem") == 0) { |
1750 | success = session_subsystem_req(s); | |
e78a59f5 | 1751 | } |
1752 | } | |
1753 | if (strcmp(rtype, "window-change") == 0) { | |
1754 | success = session_window_change_req(s); | |
1755 | } | |
1756 | ||
1757 | if (reply) { | |
1758 | packet_start(success ? | |
1759 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1760 | packet_put_int(c->remote_id); | |
1761 | packet_send(); | |
1762 | } | |
1763 | xfree(rtype); | |
1764 | } | |
1765 | ||
1766 | void | |
1767 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1768 | { | |
1769 | if (!compat20) | |
1770 | fatal("session_set_fds: called for proto != 2.0"); | |
1771 | /* | |
1772 | * now that have a child and a pipe to the child, | |
1773 | * we can activate our channel and register the fd's | |
1774 | */ | |
1775 | if (s->chanid == -1) | |
1776 | fatal("no channel for session %d", s->self); | |
1777 | channel_set_fds(s->chanid, | |
1778 | fdout, fdin, fderr, | |
a22aff1f | 1779 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
1780 | 1); | |
e78a59f5 | 1781 | } |
1782 | ||
86066315 | 1783 | /* |
1784 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
1785 | * (e.g., due to a dropped connection). | |
1786 | */ | |
396c147e | 1787 | static void |
86066315 | 1788 | session_pty_cleanup(void *session) |
7368a6c8 | 1789 | { |
86066315 | 1790 | Session *s = session; |
1791 | ||
1792 | if (s == NULL) { | |
1793 | error("session_pty_cleanup: no session"); | |
1794 | return; | |
1795 | } | |
1796 | if (s->ttyfd == -1) | |
7368a6c8 | 1797 | return; |
1798 | ||
0725ea77 | 1799 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 1800 | |
7368a6c8 | 1801 | /* Record that the user has logged out. */ |
86066315 | 1802 | if (s->pid != 0) |
1803 | record_logout(s->pid, s->tty); | |
7368a6c8 | 1804 | |
1805 | /* Release the pseudo-tty. */ | |
1806 | pty_release(s->tty); | |
1807 | ||
1808 | /* | |
1809 | * Close the server side of the socket pairs. We must do this after | |
1810 | * the pty cleanup, so that another process doesn't get this pty | |
1811 | * while we're still cleaning up. | |
1812 | */ | |
1813 | if (close(s->ptymaster) < 0) | |
1814 | error("close(s->ptymaster): %s", strerror(errno)); | |
1815 | } | |
e78a59f5 | 1816 | |
396c147e | 1817 | static void |
e78a59f5 | 1818 | session_exit_message(Session *s, int status) |
1819 | { | |
1820 | Channel *c; | |
1821 | if (s == NULL) | |
1822 | fatal("session_close: no session"); | |
1823 | c = channel_lookup(s->chanid); | |
1824 | if (c == NULL) | |
86066315 | 1825 | fatal("session_exit_message: session %d: no channel %d", |
e78a59f5 | 1826 | s->self, s->chanid); |
1827 | debug("session_exit_message: session %d channel %d pid %d", | |
1828 | s->self, s->chanid, s->pid); | |
1829 | ||
1830 | if (WIFEXITED(status)) { | |
1831 | channel_request_start(s->chanid, | |
1832 | "exit-status", 0); | |
1833 | packet_put_int(WEXITSTATUS(status)); | |
1834 | packet_send(); | |
1835 | } else if (WIFSIGNALED(status)) { | |
1836 | channel_request_start(s->chanid, | |
1837 | "exit-signal", 0); | |
1838 | packet_put_int(WTERMSIG(status)); | |
a64009ad | 1839 | #ifdef WCOREDUMP |
e78a59f5 | 1840 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 1841 | #else /* WCOREDUMP */ |
1842 | packet_put_char(0); | |
1843 | #endif /* WCOREDUMP */ | |
e78a59f5 | 1844 | packet_put_cstring(""); |
1845 | packet_put_cstring(""); | |
1846 | packet_send(); | |
1847 | } else { | |
1848 | /* Some weird exit cause. Just exit. */ | |
1849 | packet_disconnect("wait returned status %04x.", status); | |
1850 | } | |
1851 | ||
1852 | /* disconnect channel */ | |
1853 | debug("session_exit_message: release channel %d", s->chanid); | |
1854 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 1855 | /* |
1856 | * emulate a write failure with 'chan_write_failed', nobody will be | |
1857 | * interested in data we write. | |
1858 | * Note that we must not call 'chan_read_failed', since there could | |
1859 | * be some more data waiting in the pipe. | |
1860 | */ | |
0b242b12 | 1861 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
1862 | chan_write_failed(c); | |
e78a59f5 | 1863 | s->chanid = -1; |
1864 | } | |
1865 | ||
396c147e | 1866 | static void |
86066315 | 1867 | session_close(Session *s) |
e78a59f5 | 1868 | { |
86066315 | 1869 | debug("session_close: session %d pid %d", s->self, s->pid); |
1870 | if (s->ttyfd != -1) { | |
1871 | fatal_remove_cleanup(session_pty_cleanup, (void *)s); | |
1872 | session_pty_cleanup(s); | |
1873 | } | |
e78a59f5 | 1874 | if (s->term) |
1875 | xfree(s->term); | |
1876 | if (s->display) | |
1877 | xfree(s->display); | |
1878 | if (s->auth_data) | |
1879 | xfree(s->auth_data); | |
1880 | if (s->auth_proto) | |
1881 | xfree(s->auth_proto); | |
1882 | s->used = 0; | |
1d1ffb87 | 1883 | session_proctitle(s); |
e78a59f5 | 1884 | } |
1885 | ||
1886 | void | |
1887 | session_close_by_pid(pid_t pid, int status) | |
1888 | { | |
1889 | Session *s = session_by_pid(pid); | |
1890 | if (s == NULL) { | |
eb26141e | 1891 | debug("session_close_by_pid: no session for pid %d", pid); |
e78a59f5 | 1892 | return; |
1893 | } | |
1894 | if (s->chanid != -1) | |
1895 | session_exit_message(s, status); | |
1896 | session_close(s); | |
1897 | } | |
1898 | ||
1899 | /* | |
1900 | * this is called when a channel dies before | |
1901 | * the session 'child' itself dies | |
1902 | */ | |
1903 | void | |
1904 | session_close_by_channel(int id, void *arg) | |
1905 | { | |
1906 | Session *s = session_by_channel(id); | |
1907 | if (s == NULL) { | |
1908 | debug("session_close_by_channel: no session for channel %d", id); | |
1909 | return; | |
1910 | } | |
1911 | /* disconnect channel */ | |
1912 | channel_cancel_cleanup(s->chanid); | |
1913 | s->chanid = -1; | |
1914 | ||
1915 | debug("session_close_by_channel: channel %d kill %d", id, s->pid); | |
1916 | if (s->pid == 0) { | |
1917 | /* close session immediately */ | |
1918 | session_close(s); | |
1919 | } else { | |
1920 | /* notify child, delay session cleanup */ | |
512ad3c0 | 1921 | if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0) |
e78a59f5 | 1922 | error("session_close_by_channel: kill %d: %s", |
1923 | s->pid, strerror(errno)); | |
1924 | } | |
1925 | } | |
1926 | ||
396c147e | 1927 | static char * |
1d1ffb87 | 1928 | session_tty_list(void) |
1929 | { | |
1930 | static char buf[1024]; | |
1931 | int i; | |
1932 | buf[0] = '\0'; | |
1933 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1934 | Session *s = &sessions[i]; | |
1935 | if (s->used && s->ttyfd != -1) { | |
1936 | if (buf[0] != '\0') | |
1937 | strlcat(buf, ",", sizeof buf); | |
1938 | strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf); | |
1939 | } | |
1940 | } | |
1941 | if (buf[0] == '\0') | |
1942 | strlcpy(buf, "notty", sizeof buf); | |
1943 | return buf; | |
1944 | } | |
1945 | ||
1946 | void | |
1947 | session_proctitle(Session *s) | |
1948 | { | |
1949 | if (s->pw == NULL) | |
1950 | error("no user for session %d", s->self); | |
1951 | else | |
1952 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
1953 | } | |
1954 | ||
8dcd9d5c | 1955 | int |
1956 | session_setup_x11fwd(Session *s) | |
1957 | { | |
8dcd9d5c | 1958 | struct stat st; |
1959 | ||
1960 | if (no_x11_forwarding_flag) { | |
1961 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
1962 | return 0; | |
1963 | } | |
1964 | if (!options.x11_forwarding) { | |
1965 | debug("X11 forwarding disabled in server configuration file."); | |
1966 | return 0; | |
1967 | } | |
1968 | if (!options.xauth_location || | |
1969 | (stat(options.xauth_location, &st) == -1)) { | |
1970 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
1971 | return 0; | |
1972 | } | |
ff027d84 | 1973 | if (options.use_login) { |
1974 | packet_send_debug("X11 forwarding disabled; " | |
1975 | "not compatible with UseLogin=yes."); | |
1976 | return 0; | |
1977 | } | |
b44de2b1 | 1978 | if (s->display != NULL) { |
8dcd9d5c | 1979 | debug("X11 display already set."); |
1980 | return 0; | |
1981 | } | |
8dcd9d5c | 1982 | s->display = x11_create_display_inet(s->screen, options.x11_display_offset); |
1983 | if (s->display == NULL) { | |
b44de2b1 | 1984 | debug("x11_create_display_inet failed."); |
8dcd9d5c | 1985 | return 0; |
1986 | } | |
8dcd9d5c | 1987 | return 1; |
1988 | } | |
1989 | ||
396c147e | 1990 | static void |
59c97189 | 1991 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 1992 | { |
e78a59f5 | 1993 | server_loop2(); |
1994 | } |