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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. |
f3c7c613 | 12 | * Copyright (c) 2000 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" | |
eb26141e | 36 | RCSID("$OpenBSD: session.c,v 1.89 2001/06/13 09:10:31 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); | |
123 | void session_set_fds(Session *s, int fdin, int fdout, int fderr); | |
86066315 | 124 | void session_pty_cleanup(void *session); |
653d5f86 | 125 | int session_pty_req(Session *s); |
1d1ffb87 | 126 | void session_proctitle(Session *s); |
8dcd9d5c | 127 | int session_setup_x11fwd(Session *s); |
fc2a1d28 | 128 | void session_close(Session *s); |
65068d16 | 129 | void do_exec_pty(Session *s, const char *command); |
130 | void do_exec_no_pty(Session *s, const char *command); | |
a22aff1f | 131 | void do_login(Session *s, const char *command); |
7e2d5fa4 | 132 | #ifdef LOGIN_NEEDS_UTMPX |
133 | void do_pre_login(Session *s); | |
134 | #endif | |
56b3e9ce | 135 | void do_child(Session *s, const char *command); |
f2c2fd71 | 136 | void do_motd(void); |
137 | int check_quietlogin(Session *s, const char *command); | |
7368a6c8 | 138 | |
bb5639fe | 139 | void do_authenticated1(Authctxt *authctxt); |
140 | void do_authenticated2(Authctxt *authctxt); | |
141 | ||
7368a6c8 | 142 | /* import */ |
143 | extern ServerOptions options; | |
144 | extern char *__progname; | |
145 | extern int log_stderr; | |
146 | extern int debug_flag; | |
1e3b8b07 | 147 | extern u_int utmp_len; |
089fbbd2 | 148 | extern int startup_pipe; |
e78e738a | 149 | extern void destroy_sensitive_data(void); |
089fbbd2 | 150 | |
b5e300c2 | 151 | /* original command from peer. */ |
2b87da3b | 152 | char *original_command = NULL; |
b5e300c2 | 153 | |
7368a6c8 | 154 | /* data */ |
155 | #define MAX_SESSIONS 10 | |
156 | Session sessions[MAX_SESSIONS]; | |
c5d85828 | 157 | |
c1ef8333 | 158 | #ifdef WITH_AIXAUTHENTICATE |
159 | /* AIX's lastlogin message, set in auth1.c */ | |
160 | char *aixloginmsg; | |
161 | #endif /* WITH_AIXAUTHENTICATE */ | |
7368a6c8 | 162 | |
2e73a022 | 163 | #ifdef HAVE_LOGIN_CAP |
164 | static login_cap_t *lc; | |
165 | #endif | |
166 | ||
bb5639fe | 167 | void |
168 | do_authenticated(Authctxt *authctxt) | |
169 | { | |
170 | /* | |
171 | * Cancel the alarm we set to limit the time taken for | |
172 | * authentication. | |
173 | */ | |
174 | alarm(0); | |
175 | if (startup_pipe != -1) { | |
176 | close(startup_pipe); | |
177 | startup_pipe = -1; | |
178 | } | |
179 | #if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD) | |
180 | if ((lc = login_getclass(authctxt->pw->pw_class)) == NULL) { | |
181 | error("unable to get login class"); | |
182 | return; | |
183 | } | |
e78e738a | 184 | #ifdef BSD_AUTH |
185 | if (auth_approval(NULL, lc, authctxt->pw->pw_name, "ssh") <= 0) { | |
186 | packet_disconnect("Approval failure for %s", | |
187 | authctxt->pw->pw_name); | |
188 | } | |
189 | #endif | |
bb5639fe | 190 | #endif |
191 | /* setup the channel layer */ | |
192 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
193 | channel_permit_all_opens(); | |
194 | ||
195 | if (compat20) | |
196 | do_authenticated2(authctxt); | |
197 | else | |
198 | do_authenticated1(authctxt); | |
e4f7282d | 199 | |
b44de2b1 | 200 | /* remove agent socket */ |
e4f7282d | 201 | if (auth_get_socket_name()) |
f0f32b8e | 202 | auth_sock_cleanup_proc(authctxt->pw); |
bb5639fe | 203 | } |
204 | ||
7368a6c8 | 205 | /* |
206 | * Prepares for an interactive session. This is called after the user has | |
207 | * been successfully authenticated. During this message exchange, pseudo | |
208 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings | |
209 | * are requested, etc. | |
210 | */ | |
6ae2364d | 211 | void |
bb5639fe | 212 | do_authenticated1(Authctxt *authctxt) |
7368a6c8 | 213 | { |
214 | Session *s; | |
7368a6c8 | 215 | char *command; |
653d5f86 | 216 | int success, type, plen, screen_flag; |
bb5639fe | 217 | int compression_level = 0, enable_compression_after_reply = 0; |
1e3b8b07 | 218 | u_int proto_len, data_len, dlen; |
7368a6c8 | 219 | |
220 | s = session_new(); | |
bb5639fe | 221 | s->pw = authctxt->pw; |
2e73a022 | 222 | |
7368a6c8 | 223 | /* |
224 | * We stay in this loop until the client requests to execute a shell | |
225 | * or a command. | |
226 | */ | |
227 | for (;;) { | |
bb5639fe | 228 | success = 0; |
7368a6c8 | 229 | |
230 | /* Get a packet from the client. */ | |
231 | type = packet_read(&plen); | |
232 | ||
233 | /* Process the packet. */ | |
234 | switch (type) { | |
235 | case SSH_CMSG_REQUEST_COMPRESSION: | |
236 | packet_integrity_check(plen, 4, type); | |
237 | compression_level = packet_get_int(); | |
238 | if (compression_level < 1 || compression_level > 9) { | |
239 | packet_send_debug("Received illegal compression level %d.", | |
240 | compression_level); | |
241 | break; | |
242 | } | |
243 | /* Enable compression after we have responded with SUCCESS. */ | |
244 | enable_compression_after_reply = 1; | |
245 | success = 1; | |
246 | break; | |
247 | ||
248 | case SSH_CMSG_REQUEST_PTY: | |
653d5f86 | 249 | success = session_pty_req(s); |
7368a6c8 | 250 | break; |
251 | ||
252 | case SSH_CMSG_X11_REQUEST_FORWARDING: | |
7368a6c8 | 253 | s->auth_proto = packet_get_string(&proto_len); |
254 | s->auth_data = packet_get_string(&data_len); | |
7368a6c8 | 255 | |
2af09193 | 256 | screen_flag = packet_get_protocol_flags() & |
257 | SSH_PROTOFLAG_SCREEN_NUMBER; | |
258 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); | |
259 | ||
260 | if (packet_remaining() == 4) { | |
261 | if (!screen_flag) | |
262 | debug2("Buggy client: " | |
263 | "X11 screen flag missing"); | |
7368a6c8 | 264 | s->screen = packet_get_int(); |
c8b058b4 | 265 | } else { |
7368a6c8 | 266 | s->screen = 0; |
c8b058b4 | 267 | } |
8dcd9d5c | 268 | packet_done(); |
269 | success = session_setup_x11fwd(s); | |
270 | if (!success) { | |
271 | xfree(s->auth_proto); | |
272 | xfree(s->auth_data); | |
1500bcdd | 273 | s->auth_proto = NULL; |
274 | s->auth_data = NULL; | |
7368a6c8 | 275 | } |
7368a6c8 | 276 | break; |
7368a6c8 | 277 | |
278 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: | |
279 | if (no_agent_forwarding_flag || compat13) { | |
280 | debug("Authentication agent forwarding not permitted for this authentication."); | |
281 | break; | |
282 | } | |
283 | debug("Received authentication agent forwarding request."); | |
bb5639fe | 284 | success = auth_input_request_forwarding(s->pw); |
7368a6c8 | 285 | break; |
286 | ||
287 | case SSH_CMSG_PORT_FORWARD_REQUEST: | |
288 | if (no_port_forwarding_flag) { | |
289 | debug("Port forwarding not permitted for this authentication."); | |
290 | break; | |
291 | } | |
33de75a3 | 292 | if (!options.allow_tcp_forwarding) { |
293 | debug("Port forwarding not permitted."); | |
294 | break; | |
295 | } | |
7368a6c8 | 296 | debug("Received TCP/IP port forwarding request."); |
bb5639fe | 297 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); |
7368a6c8 | 298 | success = 1; |
299 | break; | |
300 | ||
301 | case SSH_CMSG_MAX_PACKET_SIZE: | |
302 | if (packet_set_maxsize(packet_get_int()) > 0) | |
303 | success = 1; | |
304 | break; | |
305 | ||
306 | case SSH_CMSG_EXEC_SHELL: | |
307 | case SSH_CMSG_EXEC_CMD: | |
7368a6c8 | 308 | if (type == SSH_CMSG_EXEC_CMD) { |
309 | command = packet_get_string(&dlen); | |
310 | debug("Exec command '%.500s'", command); | |
311 | packet_integrity_check(plen, 4 + dlen, type); | |
312 | } else { | |
313 | command = NULL; | |
314 | packet_integrity_check(plen, 0, type); | |
315 | } | |
316 | if (forced_command != NULL) { | |
b5e300c2 | 317 | original_command = command; |
7368a6c8 | 318 | command = forced_command; |
319 | debug("Forced command '%.500s'", forced_command); | |
320 | } | |
653d5f86 | 321 | if (s->ttyfd != -1) |
65068d16 | 322 | do_exec_pty(s, command); |
7368a6c8 | 323 | else |
65068d16 | 324 | do_exec_no_pty(s, command); |
7368a6c8 | 325 | if (command != NULL) |
326 | xfree(command); | |
fc2a1d28 | 327 | session_close(s); |
7368a6c8 | 328 | return; |
329 | ||
330 | default: | |
331 | /* | |
332 | * Any unknown messages in this phase are ignored, | |
333 | * and a failure message is returned. | |
334 | */ | |
335 | log("Unknown packet type received after authentication: %d", type); | |
336 | } | |
337 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); | |
338 | packet_send(); | |
339 | packet_write_wait(); | |
340 | ||
341 | /* Enable compression now that we have replied if appropriate. */ | |
342 | if (enable_compression_after_reply) { | |
343 | enable_compression_after_reply = 0; | |
344 | packet_start_compression(compression_level); | |
345 | } | |
346 | } | |
347 | } | |
348 | ||
349 | /* | |
350 | * This is called to fork and execute a command when we have no tty. This | |
351 | * will call do_child from the child, and server_loop from the parent after | |
352 | * setting up file descriptors and such. | |
353 | */ | |
6ae2364d | 354 | void |
65068d16 | 355 | do_exec_no_pty(Session *s, const char *command) |
7368a6c8 | 356 | { |
357 | int pid; | |
358 | ||
359 | #ifdef USE_PIPES | |
360 | int pin[2], pout[2], perr[2]; | |
361 | /* Allocate pipes for communicating with the program. */ | |
362 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) | |
363 | packet_disconnect("Could not create pipes: %.100s", | |
364 | strerror(errno)); | |
365 | #else /* USE_PIPES */ | |
366 | int inout[2], err[2]; | |
367 | /* Uses socket pairs to communicate with the program. */ | |
368 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || | |
369 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) | |
370 | packet_disconnect("Could not create socket pairs: %.100s", | |
371 | strerror(errno)); | |
372 | #endif /* USE_PIPES */ | |
373 | if (s == NULL) | |
374 | fatal("do_exec_no_pty: no session"); | |
375 | ||
1d1ffb87 | 376 | session_proctitle(s); |
7368a6c8 | 377 | |
b19d61d7 | 378 | #if defined(USE_PAM) |
9afbfcfa | 379 | do_pam_setcred(1); |
266140a8 | 380 | #endif /* USE_PAM */ |
381 | ||
7368a6c8 | 382 | /* Fork the child. */ |
383 | if ((pid = fork()) == 0) { | |
384 | /* Child. Reinitialize the log since the pid has changed. */ | |
385 | log_init(__progname, options.log_level, options.log_facility, log_stderr); | |
386 | ||
387 | /* | |
388 | * Create a new session and process group since the 4.4BSD | |
389 | * setlogin() affects the entire process group. | |
390 | */ | |
391 | if (setsid() < 0) | |
392 | error("setsid failed: %.100s", strerror(errno)); | |
393 | ||
394 | #ifdef USE_PIPES | |
395 | /* | |
396 | * Redirect stdin. We close the parent side of the socket | |
397 | * pair, and make the child side the standard input. | |
398 | */ | |
399 | close(pin[1]); | |
400 | if (dup2(pin[0], 0) < 0) | |
401 | perror("dup2 stdin"); | |
402 | close(pin[0]); | |
403 | ||
404 | /* Redirect stdout. */ | |
405 | close(pout[0]); | |
406 | if (dup2(pout[1], 1) < 0) | |
407 | perror("dup2 stdout"); | |
408 | close(pout[1]); | |
409 | ||
410 | /* Redirect stderr. */ | |
411 | close(perr[0]); | |
412 | if (dup2(perr[1], 2) < 0) | |
413 | perror("dup2 stderr"); | |
414 | close(perr[1]); | |
415 | #else /* USE_PIPES */ | |
416 | /* | |
417 | * Redirect stdin, stdout, and stderr. Stdin and stdout will | |
418 | * use the same socket, as some programs (particularly rdist) | |
419 | * seem to depend on it. | |
420 | */ | |
421 | close(inout[1]); | |
422 | close(err[1]); | |
423 | if (dup2(inout[0], 0) < 0) /* stdin */ | |
424 | perror("dup2 stdin"); | |
425 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ | |
426 | perror("dup2 stdout"); | |
427 | if (dup2(err[0], 2) < 0) /* stderr */ | |
428 | perror("dup2 stderr"); | |
429 | #endif /* USE_PIPES */ | |
430 | ||
431 | /* Do processing for the child (exec command etc). */ | |
56b3e9ce | 432 | do_child(s, command); |
7368a6c8 | 433 | /* NOTREACHED */ |
434 | } | |
3c62e7eb | 435 | #ifdef HAVE_CYGWIN |
436 | if (is_winnt) | |
437 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
438 | #endif | |
7368a6c8 | 439 | if (pid < 0) |
440 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
441 | s->pid = pid; | |
b5c334cc | 442 | /* Set interactive/non-interactive mode. */ |
443 | packet_set_interactive(s->display != NULL); | |
7368a6c8 | 444 | #ifdef USE_PIPES |
445 | /* We are the parent. Close the child sides of the pipes. */ | |
446 | close(pin[0]); | |
447 | close(pout[1]); | |
448 | close(perr[1]); | |
449 | ||
e78a59f5 | 450 | if (compat20) { |
e5d7a405 | 451 | session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]); |
e78a59f5 | 452 | } else { |
453 | /* Enter the interactive session. */ | |
454 | server_loop(pid, pin[1], pout[0], perr[0]); | |
e5d7a405 | 455 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
e78a59f5 | 456 | } |
7368a6c8 | 457 | #else /* USE_PIPES */ |
458 | /* We are the parent. Close the child sides of the socket pairs. */ | |
459 | close(inout[0]); | |
460 | close(err[0]); | |
461 | ||
462 | /* | |
463 | * Enter the interactive session. Note: server_loop must be able to | |
464 | * handle the case that fdin and fdout are the same. | |
465 | */ | |
e78a59f5 | 466 | if (compat20) { |
e5d7a405 | 467 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); |
e78a59f5 | 468 | } else { |
469 | server_loop(pid, inout[1], inout[1], err[1]); | |
470 | /* server_loop has closed inout[1] and err[1]. */ | |
471 | } | |
7368a6c8 | 472 | #endif /* USE_PIPES */ |
473 | } | |
474 | ||
475 | /* | |
476 | * This is called to fork and execute a command when we have a tty. This | |
477 | * will call do_child from the child, and server_loop from the parent after | |
478 | * setting up file descriptors, controlling tty, updating wtmp, utmp, | |
479 | * lastlog, and other such operations. | |
480 | */ | |
6ae2364d | 481 | void |
65068d16 | 482 | do_exec_pty(Session *s, const char *command) |
7368a6c8 | 483 | { |
7368a6c8 | 484 | int fdout, ptyfd, ttyfd, ptymaster; |
7368a6c8 | 485 | pid_t pid; |
7368a6c8 | 486 | |
487 | if (s == NULL) | |
488 | fatal("do_exec_pty: no session"); | |
489 | ptyfd = s->ptyfd; | |
490 | ttyfd = s->ttyfd; | |
491 | ||
b19d61d7 | 492 | #if defined(USE_PAM) |
bb5639fe | 493 | do_pam_session(s->pw->pw_name, s->tty); |
9afbfcfa | 494 | do_pam_setcred(1); |
27cf96de | 495 | #endif |
266140a8 | 496 | |
7368a6c8 | 497 | /* Fork the child. */ |
498 | if ((pid = fork()) == 0) { | |
c345cf9d | 499 | /* Child. Reinitialize the log because the pid has changed. */ |
7368a6c8 | 500 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
501 | ||
502 | /* Close the master side of the pseudo tty. */ | |
503 | close(ptyfd); | |
504 | ||
505 | /* Make the pseudo tty our controlling tty. */ | |
506 | pty_make_controlling_tty(&ttyfd, s->tty); | |
507 | ||
508 | /* Redirect stdin from the pseudo tty. */ | |
509 | if (dup2(ttyfd, fileno(stdin)) < 0) | |
510 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
511 | ||
512 | /* Redirect stdout to the pseudo tty. */ | |
513 | if (dup2(ttyfd, fileno(stdout)) < 0) | |
514 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
515 | ||
516 | /* Redirect stderr to the pseudo tty. */ | |
517 | if (dup2(ttyfd, fileno(stderr)) < 0) | |
518 | error("dup2 stdin failed: %.100s", strerror(errno)); | |
519 | ||
520 | /* Close the extra descriptor for the pseudo tty. */ | |
521 | close(ttyfd); | |
522 | ||
c345cf9d | 523 | /* record login, etc. similar to login(1) */ |
c96a4aaf | 524 | #ifndef HAVE_OSF_SIA |
a22aff1f | 525 | if (!(options.use_login && command == NULL)) |
526 | do_login(s, command); | |
7e2d5fa4 | 527 | # ifdef LOGIN_NEEDS_UTMPX |
528 | else | |
529 | do_pre_login(s); | |
530 | # endif | |
c96a4aaf | 531 | #endif |
7368a6c8 | 532 | |
7368a6c8 | 533 | /* Do common processing for the child, such as execing the command. */ |
56b3e9ce | 534 | do_child(s, command); |
7368a6c8 | 535 | /* NOTREACHED */ |
536 | } | |
3c62e7eb | 537 | #ifdef HAVE_CYGWIN |
538 | if (is_winnt) | |
539 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); | |
540 | #endif | |
7368a6c8 | 541 | if (pid < 0) |
542 | packet_disconnect("fork failed: %.100s", strerror(errno)); | |
543 | s->pid = pid; | |
544 | ||
545 | /* Parent. Close the slave side of the pseudo tty. */ | |
546 | close(ttyfd); | |
547 | ||
548 | /* | |
549 | * Create another descriptor of the pty master side for use as the | |
550 | * standard input. We could use the original descriptor, but this | |
551 | * simplifies code in server_loop. The descriptor is bidirectional. | |
552 | */ | |
553 | fdout = dup(ptyfd); | |
554 | if (fdout < 0) | |
555 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); | |
556 | ||
557 | /* we keep a reference to the pty master */ | |
558 | ptymaster = dup(ptyfd); | |
559 | if (ptymaster < 0) | |
560 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); | |
561 | s->ptymaster = ptymaster; | |
562 | ||
563 | /* Enter interactive session. */ | |
b5c334cc | 564 | packet_set_interactive(1); |
e78a59f5 | 565 | if (compat20) { |
566 | session_set_fds(s, ptyfd, fdout, -1); | |
567 | } else { | |
568 | server_loop(pid, ptyfd, fdout, -1); | |
569 | /* server_loop _has_ closed ptyfd and fdout. */ | |
e78a59f5 | 570 | } |
7368a6c8 | 571 | } |
572 | ||
7e2d5fa4 | 573 | #ifdef LOGIN_NEEDS_UTMPX |
574 | void | |
575 | do_pre_login(Session *s) | |
576 | { | |
577 | socklen_t fromlen; | |
578 | struct sockaddr_storage from; | |
579 | pid_t pid = getpid(); | |
580 | ||
581 | /* | |
582 | * Get IP address of client. If the connection is not a socket, let | |
583 | * the address be 0.0.0.0. | |
584 | */ | |
585 | memset(&from, 0, sizeof(from)); | |
586 | if (packet_connection_is_on_socket()) { | |
587 | fromlen = sizeof(from); | |
588 | if (getpeername(packet_get_connection_in(), | |
589 | (struct sockaddr *) & from, &fromlen) < 0) { | |
590 | debug("getpeername: %.100s", strerror(errno)); | |
591 | fatal_cleanup(); | |
592 | } | |
593 | } | |
594 | ||
595 | record_utmp_only(pid, s->tty, s->pw->pw_name, | |
596 | get_remote_name_or_ip(utmp_len, options.reverse_mapping_check), | |
597 | (struct sockaddr *)&from); | |
598 | } | |
599 | #endif | |
600 | ||
c345cf9d | 601 | /* administrative, login(1)-like work */ |
602 | void | |
a22aff1f | 603 | do_login(Session *s, const char *command) |
c345cf9d | 604 | { |
c345cf9d | 605 | char *time_string; |
b5e300c2 | 606 | char hostname[MAXHOSTNAMELEN]; |
c345cf9d | 607 | socklen_t fromlen; |
608 | struct sockaddr_storage from; | |
c345cf9d | 609 | time_t last_login_time; |
610 | struct passwd * pw = s->pw; | |
611 | pid_t pid = getpid(); | |
612 | ||
613 | /* | |
614 | * Get IP address of client. If the connection is not a socket, let | |
615 | * the address be 0.0.0.0. | |
616 | */ | |
617 | memset(&from, 0, sizeof(from)); | |
618 | if (packet_connection_is_on_socket()) { | |
619 | fromlen = sizeof(from); | |
620 | if (getpeername(packet_get_connection_in(), | |
621 | (struct sockaddr *) & from, &fromlen) < 0) { | |
622 | debug("getpeername: %.100s", strerror(errno)); | |
623 | fatal_cleanup(); | |
624 | } | |
625 | } | |
626 | ||
bcbf86ec | 627 | /* Get the time and hostname when the user last logged in. */ |
4f4648f9 | 628 | if (options.print_lastlog) { |
629 | hostname[0] = '\0'; | |
630 | last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name, | |
631 | hostname, sizeof(hostname)); | |
632 | } | |
bcbf86ec | 633 | |
c345cf9d | 634 | /* Record that there was a login on that tty from the remote host. */ |
635 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, | |
46e3af7f | 636 | get_remote_name_or_ip(utmp_len, options.reverse_mapping_check), |
637 | (struct sockaddr *)&from); | |
c345cf9d | 638 | |
2919e060 | 639 | #ifdef USE_PAM |
640 | /* | |
641 | * If password change is needed, do it now. | |
642 | * This needs to occur before the ~/.hushlogin check. | |
643 | */ | |
e11aab29 | 644 | if (is_pam_password_change_required()) { |
2919e060 | 645 | print_pam_messages(); |
646 | do_pam_chauthtok(); | |
647 | } | |
648 | #endif | |
649 | ||
f2c2fd71 | 650 | if (check_quietlogin(s, command)) |
c345cf9d | 651 | return; |
652 | ||
653 | #ifdef USE_PAM | |
e11aab29 | 654 | if (!is_pam_password_change_required()) |
2919e060 | 655 | print_pam_messages(); |
c345cf9d | 656 | #endif /* USE_PAM */ |
657 | #ifdef WITH_AIXAUTHENTICATE | |
658 | if (aixloginmsg && *aixloginmsg) | |
659 | printf("%s\n", aixloginmsg); | |
660 | #endif /* WITH_AIXAUTHENTICATE */ | |
661 | ||
4f4648f9 | 662 | if (options.print_lastlog && last_login_time != 0) { |
c345cf9d | 663 | time_string = ctime(&last_login_time); |
664 | if (strchr(time_string, '\n')) | |
665 | *strchr(time_string, '\n') = 0; | |
f478712e | 666 | if (strcmp(hostname, "") == 0) |
c345cf9d | 667 | printf("Last login: %s\r\n", time_string); |
668 | else | |
bcbf86ec | 669 | printf("Last login: %s from %s\r\n", time_string, hostname); |
c345cf9d | 670 | } |
f2c2fd71 | 671 | |
672 | do_motd(); | |
673 | } | |
674 | ||
675 | /* | |
676 | * Display the message of the day. | |
677 | */ | |
678 | void | |
679 | do_motd(void) | |
680 | { | |
681 | FILE *f; | |
682 | char buf[256]; | |
683 | ||
c345cf9d | 684 | if (options.print_motd) { |
2e73a022 | 685 | #ifdef HAVE_LOGIN_CAP |
686 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", | |
687 | "/etc/motd"), "r"); | |
688 | #else | |
c345cf9d | 689 | f = fopen("/etc/motd", "r"); |
2e73a022 | 690 | #endif |
c345cf9d | 691 | if (f) { |
692 | while (fgets(buf, sizeof(buf), f)) | |
693 | fputs(buf, stdout); | |
694 | fclose(f); | |
695 | } | |
696 | } | |
697 | } | |
698 | ||
f2c2fd71 | 699 | |
700 | /* | |
701 | * Check for quiet login, either .hushlogin or command given. | |
702 | */ | |
703 | int | |
704 | check_quietlogin(Session *s, const char *command) | |
705 | { | |
706 | char buf[256]; | |
707 | struct passwd * pw = s->pw; | |
708 | struct stat st; | |
709 | ||
710 | /* Return 1 if .hushlogin exists or a command given. */ | |
711 | if (command != NULL) | |
712 | return 1; | |
713 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); | |
714 | #ifdef HAVE_LOGIN_CAP | |
715 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) | |
716 | return 1; | |
717 | #else | |
718 | if (stat(buf, &st) >= 0) | |
719 | return 1; | |
720 | #endif | |
721 | return 0; | |
722 | } | |
723 | ||
7368a6c8 | 724 | /* |
725 | * Sets the value of the given variable in the environment. If the variable | |
726 | * already exists, its value is overriden. | |
727 | */ | |
6ae2364d | 728 | void |
1e3b8b07 | 729 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
7368a6c8 | 730 | const char *value) |
731 | { | |
1e3b8b07 | 732 | u_int i, namelen; |
7368a6c8 | 733 | char **env; |
734 | ||
735 | /* | |
736 | * Find the slot where the value should be stored. If the variable | |
737 | * already exists, we reuse the slot; otherwise we append a new slot | |
738 | * at the end of the array, expanding if necessary. | |
739 | */ | |
740 | env = *envp; | |
741 | namelen = strlen(name); | |
742 | for (i = 0; env[i]; i++) | |
743 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') | |
744 | break; | |
745 | if (env[i]) { | |
746 | /* Reuse the slot. */ | |
747 | xfree(env[i]); | |
748 | } else { | |
749 | /* New variable. Expand if necessary. */ | |
750 | if (i >= (*envsizep) - 1) { | |
751 | (*envsizep) += 50; | |
752 | env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *)); | |
753 | } | |
754 | /* Need to set the NULL pointer at end of array beyond the new slot. */ | |
755 | env[i + 1] = NULL; | |
756 | } | |
757 | ||
758 | /* Allocate space and format the variable in the appropriate slot. */ | |
759 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); | |
760 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); | |
761 | } | |
762 | ||
763 | /* | |
764 | * Reads environment variables from the given file and adds/overrides them | |
765 | * into the environment. If the file does not exist, this does nothing. | |
766 | * Otherwise, it must consist of empty lines, comments (line starts with '#') | |
767 | * and assignments of the form name=value. No other forms are allowed. | |
768 | */ | |
6ae2364d | 769 | void |
1e3b8b07 | 770 | read_environment_file(char ***env, u_int *envsize, |
7368a6c8 | 771 | const char *filename) |
772 | { | |
773 | FILE *f; | |
774 | char buf[4096]; | |
775 | char *cp, *value; | |
776 | ||
777 | f = fopen(filename, "r"); | |
778 | if (!f) | |
779 | return; | |
780 | ||
781 | while (fgets(buf, sizeof(buf), f)) { | |
782 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) | |
783 | ; | |
784 | if (!*cp || *cp == '#' || *cp == '\n') | |
785 | continue; | |
786 | if (strchr(cp, '\n')) | |
787 | *strchr(cp, '\n') = '\0'; | |
788 | value = strchr(cp, '='); | |
789 | if (value == NULL) { | |
790 | fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf); | |
791 | continue; | |
792 | } | |
71276795 | 793 | /* |
794 | * Replace the equals sign by nul, and advance value to | |
795 | * the value string. | |
796 | */ | |
7368a6c8 | 797 | *value = '\0'; |
798 | value++; | |
799 | child_set_env(env, envsize, cp, value); | |
800 | } | |
801 | fclose(f); | |
802 | } | |
803 | ||
804 | #ifdef USE_PAM | |
805 | /* | |
806 | * Sets any environment variables which have been specified by PAM | |
807 | */ | |
808 | void do_pam_environment(char ***env, int *envsize) | |
809 | { | |
810 | char *equals, var_name[512], var_val[512]; | |
811 | char **pam_env; | |
812 | int i; | |
813 | ||
814 | if ((pam_env = fetch_pam_environment()) == NULL) | |
815 | return; | |
2b87da3b | 816 | |
7368a6c8 | 817 | for(i = 0; pam_env[i] != NULL; i++) { |
818 | if ((equals = strstr(pam_env[i], "=")) == NULL) | |
819 | continue; | |
2b87da3b | 820 | |
7368a6c8 | 821 | if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) { |
822 | memset(var_name, '\0', sizeof(var_name)); | |
823 | memset(var_val, '\0', sizeof(var_val)); | |
824 | ||
825 | strncpy(var_name, pam_env[i], equals - pam_env[i]); | |
826 | strcpy(var_val, equals + 1); | |
827 | ||
22d89d24 | 828 | debug3("PAM environment: %s=%s", var_name, var_val); |
7368a6c8 | 829 | |
830 | child_set_env(env, envsize, var_name, var_val); | |
831 | } | |
832 | } | |
833 | } | |
834 | #endif /* USE_PAM */ | |
835 | ||
22d89d24 | 836 | #ifdef HAVE_CYGWIN |
837 | void copy_environment(char ***env, int *envsize) | |
838 | { | |
839 | char *equals, var_name[512], var_val[512]; | |
840 | int i; | |
841 | ||
842 | for(i = 0; environ[i] != NULL; i++) { | |
843 | if ((equals = strstr(environ[i], "=")) == NULL) | |
844 | continue; | |
2b87da3b | 845 | |
22d89d24 | 846 | if (strlen(environ[i]) < (sizeof(var_name) - 1)) { |
847 | memset(var_name, '\0', sizeof(var_name)); | |
848 | memset(var_val, '\0', sizeof(var_val)); | |
849 | ||
850 | strncpy(var_name, environ[i], equals - environ[i]); | |
851 | strcpy(var_val, equals + 1); | |
852 | ||
853 | debug3("Copy environment: %s=%s", var_name, var_val); | |
854 | ||
855 | child_set_env(env, envsize, var_name, var_val); | |
856 | } | |
857 | } | |
858 | } | |
859 | #endif | |
860 | ||
5fa45897 | 861 | #if defined(HAVE_GETUSERATTR) |
862 | /* | |
863 | * AIX-specific login initialisation | |
864 | */ | |
865 | void set_limit(char *user, char *soft, char *hard, int resource, int mult) | |
866 | { | |
867 | struct rlimit rlim; | |
56118702 | 868 | int slim, hlim; |
5fa45897 | 869 | |
870 | getrlimit(resource, &rlim); | |
871 | ||
56118702 | 872 | slim = 0; |
873 | if (getuserattr(user, soft, &slim, SEC_INT) != -1) { | |
874 | if (slim < 0) { | |
875 | rlim.rlim_cur = RLIM_INFINITY; | |
876 | } else if (slim != 0) { | |
877 | /* See the wackiness below */ | |
878 | if (rlim.rlim_cur == slim * mult) | |
879 | slim = 0; | |
880 | else | |
881 | rlim.rlim_cur = slim * mult; | |
882 | } | |
883 | } | |
5fa45897 | 884 | |
56118702 | 885 | hlim = 0; |
886 | if (getuserattr(user, hard, &hlim, SEC_INT) != -1) { | |
887 | if (hlim < 0) { | |
888 | rlim.rlim_max = RLIM_INFINITY; | |
889 | } else if (hlim != 0) { | |
890 | rlim.rlim_max = hlim * mult; | |
891 | } | |
892 | } | |
5fa45897 | 893 | |
56118702 | 894 | /* |
895 | * XXX For cpu and fsize the soft limit is set to the hard limit | |
896 | * if the hard limit is left at its default value and the soft limit | |
897 | * is changed from its default value, either by requesting it | |
898 | * (slim == 0) or by setting it to the current default. At least | |
899 | * that's how rlogind does it. If you're confused you're not alone. | |
900 | * Bug or feature? AIX 4.3.1.2 | |
901 | */ | |
902 | if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu")) | |
903 | && hlim == 0 && slim != 0) | |
904 | rlim.rlim_max = rlim.rlim_cur; | |
905 | /* A specified hard limit limits the soft limit */ | |
906 | else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max) | |
907 | rlim.rlim_cur = rlim.rlim_max; | |
908 | /* A soft limit can increase a hard limit */ | |
909 | else if (rlim.rlim_cur > rlim.rlim_max) | |
5fa45897 | 910 | rlim.rlim_max = rlim.rlim_cur; |
911 | ||
912 | if (setrlimit(resource, &rlim) != 0) | |
56118702 | 913 | error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno)); |
5fa45897 | 914 | } |
915 | ||
916 | void set_limits_from_userattr(char *user) | |
917 | { | |
918 | int mask; | |
919 | char buf[16]; | |
920 | ||
921 | set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512); | |
922 | set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1); | |
923 | set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512); | |
924 | set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512); | |
925 | set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512); | |
926 | set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512); | |
927 | #if defined(S_UNOFILE) | |
928 | set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1); | |
929 | #endif | |
930 | ||
931 | if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) { | |
932 | /* Convert decimal to octal */ | |
933 | (void) snprintf(buf, sizeof(buf), "%d", mask); | |
934 | if (sscanf(buf, "%o", &mask) == 1) | |
935 | umask(mask); | |
936 | } | |
937 | } | |
938 | #endif /* defined(HAVE_GETUSERATTR) */ | |
939 | ||
7368a6c8 | 940 | /* |
941 | * Performs common processing for the child, such as setting up the | |
942 | * environment, closing extra file descriptors, setting the user and group | |
943 | * ids, and executing the command or shell. | |
944 | */ | |
6ae2364d | 945 | void |
56b3e9ce | 946 | do_child(Session *s, const char *command) |
7368a6c8 | 947 | { |
b5e300c2 | 948 | const char *shell, *hostname = NULL, *cp = NULL; |
56b3e9ce | 949 | struct passwd * pw = s->pw; |
7368a6c8 | 950 | char buf[256]; |
6fc1e9f3 | 951 | char cmd[1024]; |
2e73a022 | 952 | FILE *f = NULL; |
1e3b8b07 | 953 | u_int envsize, i; |
7368a6c8 | 954 | char **env; |
955 | extern char **environ; | |
956 | struct stat st; | |
957 | char *argv[10]; | |
1500bcdd | 958 | int do_xauth; |
3206bb3b | 959 | #ifdef WITH_IRIX_PROJECT |
960 | prid_t projid; | |
961 | #endif /* WITH_IRIX_PROJECT */ | |
d287c664 | 962 | #ifdef WITH_IRIX_JOBS |
963 | jid_t jid = 0; | |
964 | #else | |
965 | #ifdef WITH_IRIX_ARRAY | |
966 | int jid = 0; | |
967 | #endif /* WITH_IRIX_ARRAY */ | |
968 | #endif /* WITH_IRIX_JOBS */ | |
969 | ||
1500bcdd | 970 | do_xauth = |
971 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; | |
972 | ||
e78e738a | 973 | /* remove hostkey from the child's memory */ |
974 | destroy_sensitive_data(); | |
975 | ||
fa649821 | 976 | /* login(1) is only called if we execute the login shell */ |
977 | if (options.use_login && command != NULL) | |
978 | options.use_login = 0; | |
979 | ||
c96a4aaf | 980 | #if !defined(USE_PAM) && !defined(HAVE_OSF_SIA) |
2e73a022 | 981 | if (!options.use_login) { |
982 | # ifdef HAVE_LOGIN_CAP | |
983 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) | |
984 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, | |
985 | _PATH_NOLOGIN), "r"); | |
986 | # else /* HAVE_LOGIN_CAP */ | |
987 | if (pw->pw_uid) | |
988 | f = fopen(_PATH_NOLOGIN, "r"); | |
989 | # endif /* HAVE_LOGIN_CAP */ | |
990 | if (f) { | |
991 | /* /etc/nologin exists. Print its contents and exit. */ | |
992 | while (fgets(buf, sizeof(buf), f)) | |
993 | fputs(buf, stderr); | |
994 | fclose(f); | |
7368a6c8 | 995 | exit(254); |
2e73a022 | 996 | } |
7368a6c8 | 997 | } |
c96a4aaf | 998 | #endif /* USE_PAM || HAVE_OSF_SIA */ |
7368a6c8 | 999 | |
2e73a022 | 1000 | /* Set login name, uid, gid, and groups. */ |
7368a6c8 | 1001 | /* Login(1) does this as well, and it needs uid 0 for the "-h" |
1002 | switch, so we let login(1) to this for us. */ | |
1003 | if (!options.use_login) { | |
4d33e531 | 1004 | #ifdef HAVE_OSF_SIA |
7a7101ec | 1005 | session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty); |
c96a4aaf | 1006 | if (!check_quietlogin(s, command)) |
1007 | do_motd(); | |
815800e1 | 1008 | #else /* HAVE_OSF_SIA */ |
3c62e7eb | 1009 | #ifdef HAVE_CYGWIN |
1010 | if (is_winnt) { | |
1011 | #else | |
7368a6c8 | 1012 | if (getuid() == 0 || geteuid() == 0) { |
3c62e7eb | 1013 | #endif |
2e73a022 | 1014 | # ifdef HAVE_GETUSERATTR |
5fa45897 | 1015 | set_limits_from_userattr(pw->pw_name); |
2e73a022 | 1016 | # endif /* HAVE_GETUSERATTR */ |
1017 | # ifdef HAVE_LOGIN_CAP | |
1018 | if (setusercontext(lc, pw, pw->pw_uid, | |
1019 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { | |
1020 | perror("unable to set user context"); | |
1021 | exit(1); | |
1022 | } | |
1023 | # else /* HAVE_LOGIN_CAP */ | |
73d6d7fa | 1024 | #if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) |
1025 | /* Sets login uid for accounting */ | |
1026 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) | |
1027 | error("setluid: %s", strerror(errno)); | |
1028 | #endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ | |
1029 | ||
2e73a022 | 1030 | if (setlogin(pw->pw_name) < 0) |
1031 | error("setlogin failed: %s", strerror(errno)); | |
7368a6c8 | 1032 | if (setgid(pw->pw_gid) < 0) { |
1033 | perror("setgid"); | |
1034 | exit(1); | |
1035 | } | |
1036 | /* Initialize the group list. */ | |
1037 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { | |
1038 | perror("initgroups"); | |
1039 | exit(1); | |
1040 | } | |
1041 | endgrent(); | |
9afbfcfa | 1042 | # ifdef USE_PAM |
1043 | /* | |
1044 | * PAM credentials may take the form of | |
1045 | * supplementary groups. These will have been | |
1046 | * wiped by the above initgroups() call. | |
1047 | * Reestablish them here. | |
1048 | */ | |
1049 | do_pam_setcred(0); | |
1050 | # endif /* USE_PAM */ | |
d287c664 | 1051 | # ifdef WITH_IRIX_JOBS |
1052 | jid = jlimit_startjob(pw->pw_name, pw->pw_uid, "interactive"); | |
1053 | if (jid == -1) { | |
1054 | fatal("Failed to create job container: %.100s", | |
1055 | strerror(errno)); | |
2b87da3b | 1056 | } |
d287c664 | 1057 | # endif /* WITH_IRIX_JOBS */ |
2e73a022 | 1058 | # ifdef WITH_IRIX_ARRAY |
3206bb3b | 1059 | /* initialize array session */ |
d287c664 | 1060 | if (jid == 0) { |
1061 | if (newarraysess() != 0) | |
1062 | fatal("Failed to set up new array session: %.100s", | |
1063 | strerror(errno)); | |
1064 | } | |
2e73a022 | 1065 | # endif /* WITH_IRIX_ARRAY */ |
1066 | # ifdef WITH_IRIX_PROJECT | |
3206bb3b | 1067 | /* initialize irix project info */ |
1068 | if ((projid = getdfltprojuser(pw->pw_name)) == -1) { | |
1069 | debug("Failed to get project id, using projid 0"); | |
1070 | projid = 0; | |
1071 | } | |
3206bb3b | 1072 | if (setprid(projid)) |
1073 | fatal("Failed to initialize project %d for %s: %.100s", | |
1074 | (int)projid, pw->pw_name, strerror(errno)); | |
2e73a022 | 1075 | # endif /* WITH_IRIX_PROJECT */ |
260d427b | 1076 | #ifdef WITH_IRIX_AUDIT |
1077 | if (sysconf(_SC_AUDIT)) { | |
1078 | debug("Setting sat id to %d", (int) pw->pw_uid); | |
1079 | if (satsetid(pw->pw_uid)) | |
1080 | debug("error setting satid: %.100s", strerror(errno)); | |
1081 | } | |
1082 | #endif /* WITH_IRIX_AUDIT */ | |
1083 | ||
8a968c25 | 1084 | #ifdef _AIX |
1085 | /* | |
1086 | * AIX has a "usrinfo" area where logname and | |
1087 | * other stuff is stored - a few applications | |
1088 | * actually use this and die if it's not set | |
1089 | */ | |
ee110bfb | 1090 | if (s->ttyfd == -1) |
1091 | s->tty[0] = '\0'; | |
f5f6020e | 1092 | cp = xmalloc(22 + strlen(s->tty) + |
8a968c25 | 1093 | 2 * strlen(pw->pw_name)); |
1094 | i = sprintf(cp, "LOGNAME=%s%cNAME=%s%cTTY=%s%c%c", | |
ee110bfb | 1095 | pw->pw_name, 0, pw->pw_name, 0, s->tty, 0, 0); |
8a968c25 | 1096 | if (usrinfo(SETUINFO, cp, i) == -1) |
1097 | fatal("Couldn't set usrinfo: %s", | |
1098 | strerror(errno)); | |
1099 | debug3("AIX/UsrInfo: set len %d", i); | |
1100 | xfree(cp); | |
1101 | #endif | |
1102 | ||
7368a6c8 | 1103 | /* Permanently switch to the desired uid. */ |
63bd8c36 | 1104 | permanently_set_uid(pw); |
2e73a022 | 1105 | # endif /* HAVE_LOGIN_CAP */ |
7368a6c8 | 1106 | } |
2e73a022 | 1107 | #endif /* HAVE_OSF_SIA */ |
1108 | ||
3c62e7eb | 1109 | #ifdef HAVE_CYGWIN |
1110 | if (is_winnt) | |
1111 | #endif | |
7368a6c8 | 1112 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
14a9a859 | 1113 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); |
7368a6c8 | 1114 | } |
1115 | /* | |
1116 | * Get the shell from the password data. An empty shell field is | |
1117 | * legal, and means /bin/sh. | |
1118 | */ | |
1119 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
2e73a022 | 1120 | #ifdef HAVE_LOGIN_CAP |
1121 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); | |
1122 | #endif | |
7368a6c8 | 1123 | |
1124 | #ifdef AFS | |
1125 | /* Try to get AFS tokens for the local cell. */ | |
1126 | if (k_hasafs()) { | |
1127 | char cell[64]; | |
1128 | ||
1129 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) | |
1130 | krb_afslog(cell, 0); | |
1131 | ||
1132 | krb_afslog(0, 0); | |
1133 | } | |
1134 | #endif /* AFS */ | |
1135 | ||
1136 | /* Initialize the environment. */ | |
1137 | envsize = 100; | |
1138 | env = xmalloc(envsize * sizeof(char *)); | |
1139 | env[0] = NULL; | |
1140 | ||
3c62e7eb | 1141 | #ifdef HAVE_CYGWIN |
1142 | /* | |
1143 | * The Windows environment contains some setting which are | |
1144 | * important for a running system. They must not be dropped. | |
1145 | */ | |
22d89d24 | 1146 | copy_environment(&env, &envsize); |
3c62e7eb | 1147 | #endif |
1148 | ||
7368a6c8 | 1149 | if (!options.use_login) { |
1150 | /* Set basic environment. */ | |
1151 | child_set_env(&env, &envsize, "USER", pw->pw_name); | |
1152 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); | |
1153 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); | |
2e73a022 | 1154 | #ifdef HAVE_LOGIN_CAP |
1155 | (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH); | |
1156 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); | |
22d89d24 | 1157 | #else /* HAVE_LOGIN_CAP */ |
1158 | # ifndef HAVE_CYGWIN | |
3c62e7eb | 1159 | /* |
1160 | * There's no standard path on Windows. The path contains | |
1161 | * important components pointing to the system directories, | |
1162 | * needed for loading shared libraries. So the path better | |
1163 | * remains intact here. | |
1164 | */ | |
7368a6c8 | 1165 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); |
22d89d24 | 1166 | # endif /* HAVE_CYGWIN */ |
1167 | #endif /* HAVE_LOGIN_CAP */ | |
7368a6c8 | 1168 | |
1169 | snprintf(buf, sizeof buf, "%.200s/%.50s", | |
1170 | _PATH_MAILDIR, pw->pw_name); | |
1171 | child_set_env(&env, &envsize, "MAIL", buf); | |
1172 | ||
1173 | /* Normal systems set SHELL by default. */ | |
1174 | child_set_env(&env, &envsize, "SHELL", shell); | |
1175 | } | |
1176 | if (getenv("TZ")) | |
1177 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); | |
1178 | ||
1179 | /* Set custom environment options from RSA authentication. */ | |
1180 | while (custom_environment) { | |
1181 | struct envstring *ce = custom_environment; | |
1182 | char *s = ce->s; | |
1183 | int i; | |
1184 | for (i = 0; s[i] != '=' && s[i]; i++); | |
1185 | if (s[i] == '=') { | |
1186 | s[i] = 0; | |
1187 | child_set_env(&env, &envsize, s, s + i + 1); | |
1188 | } | |
1189 | custom_environment = ce->next; | |
1190 | xfree(ce->s); | |
1191 | xfree(ce); | |
1192 | } | |
1193 | ||
1194 | snprintf(buf, sizeof buf, "%.50s %d %d", | |
1195 | get_remote_ipaddr(), get_remote_port(), get_local_port()); | |
1196 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); | |
1197 | ||
56b3e9ce | 1198 | if (s->ttyfd != -1) |
1199 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); | |
1200 | if (s->term) | |
1201 | child_set_env(&env, &envsize, "TERM", s->term); | |
1202 | if (s->display) | |
1203 | child_set_env(&env, &envsize, "DISPLAY", s->display); | |
b5e300c2 | 1204 | if (original_command) |
1205 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", | |
1206 | original_command); | |
7368a6c8 | 1207 | |
1208 | #ifdef _AIX | |
22d89d24 | 1209 | if ((cp = getenv("AUTHSTATE")) != NULL) |
1210 | child_set_env(&env, &envsize, "AUTHSTATE", cp); | |
1211 | if ((cp = getenv("KRB5CCNAME")) != NULL) | |
1212 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); | |
1213 | read_environment_file(&env, &envsize, "/etc/environment"); | |
7368a6c8 | 1214 | #endif |
1215 | ||
1216 | #ifdef KRB4 | |
1217 | { | |
1218 | extern char *ticket; | |
1219 | ||
1220 | if (ticket) | |
1221 | child_set_env(&env, &envsize, "KRBTKFILE", ticket); | |
1222 | } | |
1223 | #endif /* KRB4 */ | |
1224 | ||
1225 | #ifdef USE_PAM | |
1226 | /* Pull in any environment variables that may have been set by PAM. */ | |
1227 | do_pam_environment(&env, &envsize); | |
1228 | #endif /* USE_PAM */ | |
1229 | ||
7368a6c8 | 1230 | if (auth_get_socket_name() != NULL) |
1231 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, | |
1232 | auth_get_socket_name()); | |
1233 | ||
1234 | /* read $HOME/.ssh/environment. */ | |
1235 | if (!options.use_login) { | |
71276795 | 1236 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
1237 | pw->pw_dir); | |
7368a6c8 | 1238 | read_environment_file(&env, &envsize, buf); |
1239 | } | |
1240 | if (debug_flag) { | |
1241 | /* dump the environment */ | |
1242 | fprintf(stderr, "Environment:\n"); | |
1243 | for (i = 0; env[i]; i++) | |
1244 | fprintf(stderr, " %.200s\n", env[i]); | |
1245 | } | |
2e73a022 | 1246 | /* we have to stash the hostname before we close our socket. */ |
1247 | if (options.use_login) | |
46e3af7f | 1248 | hostname = get_remote_name_or_ip(utmp_len, |
1249 | options.reverse_mapping_check); | |
7368a6c8 | 1250 | /* |
1251 | * Close the connection descriptors; note that this is the child, and | |
1252 | * the server will still have the socket open, and it is important | |
1253 | * that we do not shutdown it. Note that the descriptors cannot be | |
1254 | * closed before building the environment, as we call | |
1255 | * get_remote_ipaddr there. | |
1256 | */ | |
1257 | if (packet_get_connection_in() == packet_get_connection_out()) | |
1258 | close(packet_get_connection_in()); | |
1259 | else { | |
1260 | close(packet_get_connection_in()); | |
1261 | close(packet_get_connection_out()); | |
1262 | } | |
1263 | /* | |
1264 | * Close all descriptors related to channels. They will still remain | |
1265 | * open in the parent. | |
1266 | */ | |
1267 | /* XXX better use close-on-exec? -markus */ | |
1268 | channel_close_all(); | |
1269 | ||
1270 | /* | |
1271 | * Close any extra file descriptors. Note that there may still be | |
1272 | * descriptors left by system functions. They will be closed later. | |
1273 | */ | |
1274 | endpwent(); | |
1275 | ||
1276 | /* | |
1277 | * Close any extra open file descriptors so that we don\'t have them | |
1278 | * hanging around in clients. Note that we want to do this after | |
1279 | * initgroups, because at least on Solaris 2.3 it leaves file | |
1280 | * descriptors open. | |
1281 | */ | |
1282 | for (i = 3; i < 64; i++) | |
1283 | close(i); | |
1284 | ||
1285 | /* Change current directory to the user\'s home directory. */ | |
2e73a022 | 1286 | if (chdir(pw->pw_dir) < 0) { |
7368a6c8 | 1287 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", |
1288 | pw->pw_dir, strerror(errno)); | |
2e73a022 | 1289 | #ifdef HAVE_LOGIN_CAP |
1290 | if (login_getcapbool(lc, "requirehome", 0)) | |
1291 | exit(1); | |
1292 | #endif | |
1293 | } | |
7368a6c8 | 1294 | |
1295 | /* | |
1296 | * Must take new environment into use so that .ssh/rc, /etc/sshrc and | |
1297 | * xauth are run in the proper environment. | |
1298 | */ | |
1299 | environ = env; | |
1300 | ||
1301 | /* | |
1302 | * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first | |
1303 | * in this order). | |
1304 | */ | |
1305 | if (!options.use_login) { | |
e78e738a | 1306 | /* ignore _PATH_SSH_USER_RC for subsystems */ |
1307 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { | |
503e7e5b | 1308 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", |
1309 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); | |
7368a6c8 | 1310 | if (debug_flag) |
503e7e5b | 1311 | fprintf(stderr, "Running %s\n", cmd); |
1312 | f = popen(cmd, "w"); | |
7368a6c8 | 1313 | if (f) { |
56b3e9ce | 1314 | if (do_xauth) |
1315 | fprintf(f, "%s %s\n", s->auth_proto, | |
1316 | s->auth_data); | |
7368a6c8 | 1317 | pclose(f); |
1318 | } else | |
96c63318 | 1319 | fprintf(stderr, "Could not run %s\n", |
56b3e9ce | 1320 | _PATH_SSH_USER_RC); |
42f11eb2 | 1321 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { |
7368a6c8 | 1322 | if (debug_flag) |
56b3e9ce | 1323 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, |
1324 | _PATH_SSH_SYSTEM_RC); | |
42f11eb2 | 1325 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); |
7368a6c8 | 1326 | if (f) { |
56b3e9ce | 1327 | if (do_xauth) |
1328 | fprintf(f, "%s %s\n", s->auth_proto, | |
1329 | s->auth_data); | |
7368a6c8 | 1330 | pclose(f); |
1331 | } else | |
56b3e9ce | 1332 | fprintf(stderr, "Could not run %s\n", |
1333 | _PATH_SSH_SYSTEM_RC); | |
1334 | } else if (do_xauth && options.xauth_location != NULL) { | |
7368a6c8 | 1335 | /* Add authority data to .Xauthority if appropriate. */ |
56b3e9ce | 1336 | char *screen = strchr(s->display, ':'); |
1337 | ||
1338 | if (debug_flag) { | |
1339 | fprintf(stderr, | |
1340 | "Running %.100s add " | |
1341 | "%.100s %.100s %.100s\n", | |
1342 | options.xauth_location, s->display, | |
1343 | s->auth_proto, s->auth_data); | |
1344 | if (screen != NULL) | |
71276795 | 1345 | fprintf(stderr, |
56b3e9ce | 1346 | "Adding %.*s/unix%s %s %s\n", |
1347 | (int)(screen - s->display), | |
1348 | s->display, screen, | |
1349 | s->auth_proto, s->auth_data); | |
1350 | } | |
1351 | snprintf(cmd, sizeof cmd, "%s -q -", | |
1352 | options.xauth_location); | |
1353 | f = popen(cmd, "w"); | |
1354 | if (f) { | |
1355 | fprintf(f, "add %s %s %s\n", s->display, | |
1356 | s->auth_proto, s->auth_data); | |
1357 | if (screen != NULL) | |
1358 | fprintf(f, "add %.*s/unix%s %s %s\n", | |
1359 | (int)(screen - s->display), | |
1360 | s->display, screen, | |
1361 | s->auth_proto, | |
1362 | s->auth_data); | |
1363 | pclose(f); | |
1364 | } else { | |
1365 | fprintf(stderr, "Could not run %s\n", | |
1366 | cmd); | |
7368a6c8 | 1367 | } |
1368 | } | |
7368a6c8 | 1369 | /* Get the last component of the shell name. */ |
1370 | cp = strrchr(shell, '/'); | |
1371 | if (cp) | |
1372 | cp++; | |
1373 | else | |
1374 | cp = shell; | |
1375 | } | |
1d3c30db | 1376 | |
1377 | /* restore SIGPIPE for child */ | |
1378 | signal(SIGPIPE, SIG_DFL); | |
1379 | ||
7368a6c8 | 1380 | /* |
1381 | * If we have no command, execute the shell. In this case, the shell | |
1382 | * name to be passed in argv[0] is preceded by '-' to indicate that | |
1383 | * this is a login shell. | |
1384 | */ | |
1385 | if (!command) { | |
1386 | if (!options.use_login) { | |
1387 | char buf[256]; | |
1388 | ||
1389 | /* | |
1390 | * Check for mail if we have a tty and it was enabled | |
1391 | * in server options. | |
1392 | */ | |
56b3e9ce | 1393 | if (s->ttyfd != -1 && options.check_mail) { |
7368a6c8 | 1394 | char *mailbox; |
1395 | struct stat mailstat; | |
56b3e9ce | 1396 | |
7368a6c8 | 1397 | mailbox = getenv("MAIL"); |
1398 | if (mailbox != NULL) { | |
71276795 | 1399 | if (stat(mailbox, &mailstat) != 0 || |
1400 | mailstat.st_size == 0) | |
7368a6c8 | 1401 | printf("No mail.\n"); |
1402 | else if (mailstat.st_mtime < mailstat.st_atime) | |
1403 | printf("You have mail.\n"); | |
1404 | else | |
1405 | printf("You have new mail.\n"); | |
1406 | } | |
1407 | } | |
1408 | /* Start the shell. Set initial character to '-'. */ | |
1409 | buf[0] = '-'; | |
1410 | strncpy(buf + 1, cp, sizeof(buf) - 1); | |
1411 | buf[sizeof(buf) - 1] = 0; | |
1412 | ||
1413 | /* Execute the shell. */ | |
1414 | argv[0] = buf; | |
1415 | argv[1] = NULL; | |
1416 | execve(shell, argv, env); | |
1417 | ||
1418 | /* Executing the shell failed. */ | |
1419 | perror(shell); | |
1420 | exit(1); | |
1421 | ||
1422 | } else { | |
1423 | /* Launch login(1). */ | |
1424 | ||
2e73a022 | 1425 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
7e2d5fa4 | 1426 | #ifdef LOGIN_NEEDS_TERM |
1427 | s->term? s->term : "unknown", | |
1428 | #endif | |
c345cf9d | 1429 | "-p", "-f", "--", pw->pw_name, NULL); |
7368a6c8 | 1430 | |
1431 | /* Login couldn't be executed, die. */ | |
1432 | ||
1433 | perror("login"); | |
1434 | exit(1); | |
1435 | } | |
1436 | } | |
1437 | /* | |
1438 | * Execute the command using the user's shell. This uses the -c | |
1439 | * option to execute the command. | |
1440 | */ | |
1441 | argv[0] = (char *) cp; | |
1442 | argv[1] = "-c"; | |
1443 | argv[2] = (char *) command; | |
1444 | argv[3] = NULL; | |
1445 | execve(shell, argv, env); | |
1446 | perror(shell); | |
1447 | exit(1); | |
1448 | } | |
1449 | ||
1450 | Session * | |
1451 | session_new(void) | |
1452 | { | |
1453 | int i; | |
1454 | static int did_init = 0; | |
1455 | if (!did_init) { | |
1456 | debug("session_new: init"); | |
1457 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1458 | sessions[i].used = 0; | |
7368a6c8 | 1459 | } |
1460 | did_init = 1; | |
1461 | } | |
1462 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1463 | Session *s = &sessions[i]; | |
1464 | if (! s->used) { | |
690d0d7f | 1465 | memset(s, 0, sizeof(*s)); |
7368a6c8 | 1466 | s->chanid = -1; |
1467 | s->ptyfd = -1; | |
1468 | s->ttyfd = -1; | |
7368a6c8 | 1469 | s->used = 1; |
86066315 | 1470 | s->self = i; |
02323c45 | 1471 | debug("session_new: session %d", i); |
7368a6c8 | 1472 | return s; |
1473 | } | |
1474 | } | |
1475 | return NULL; | |
1476 | } | |
1477 | ||
1478 | void | |
1479 | session_dump(void) | |
1480 | { | |
1481 | int i; | |
1482 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1483 | Session *s = &sessions[i]; | |
1484 | debug("dump: used %d session %d %p channel %d pid %d", | |
1485 | s->used, | |
1486 | s->self, | |
1487 | s, | |
1488 | s->chanid, | |
1489 | s->pid); | |
1490 | } | |
1491 | } | |
1492 | ||
e78a59f5 | 1493 | int |
1494 | session_open(int chanid) | |
1495 | { | |
1496 | Session *s = session_new(); | |
1497 | debug("session_open: channel %d", chanid); | |
1498 | if (s == NULL) { | |
1499 | error("no more sessions"); | |
1500 | return 0; | |
1501 | } | |
e78a59f5 | 1502 | s->pw = auth_get_user(); |
1503 | if (s->pw == NULL) | |
0725ea77 | 1504 | fatal("no user for session %d", s->self); |
0b242b12 | 1505 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
1506 | s->chanid = chanid; | |
e78a59f5 | 1507 | return 1; |
1508 | } | |
1509 | ||
1510 | Session * | |
1511 | session_by_channel(int id) | |
1512 | { | |
1513 | int i; | |
1514 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1515 | Session *s = &sessions[i]; | |
1516 | if (s->used && s->chanid == id) { | |
1517 | debug("session_by_channel: session %d channel %d", i, id); | |
1518 | return s; | |
1519 | } | |
1520 | } | |
1521 | debug("session_by_channel: unknown channel %d", id); | |
1522 | session_dump(); | |
1523 | return NULL; | |
1524 | } | |
1525 | ||
1526 | Session * | |
1527 | session_by_pid(pid_t pid) | |
1528 | { | |
1529 | int i; | |
1530 | debug("session_by_pid: pid %d", pid); | |
1531 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1532 | Session *s = &sessions[i]; | |
1533 | if (s->used && s->pid == pid) | |
1534 | return s; | |
1535 | } | |
1536 | error("session_by_pid: unknown pid %d", pid); | |
1537 | session_dump(); | |
1538 | return NULL; | |
1539 | } | |
1540 | ||
1541 | int | |
1542 | session_window_change_req(Session *s) | |
1543 | { | |
1544 | s->col = packet_get_int(); | |
1545 | s->row = packet_get_int(); | |
1546 | s->xpixel = packet_get_int(); | |
1547 | s->ypixel = packet_get_int(); | |
6ae2364d | 1548 | packet_done(); |
e78a59f5 | 1549 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1550 | return 1; | |
1551 | } | |
1552 | ||
1553 | int | |
1554 | session_pty_req(Session *s) | |
1555 | { | |
1e3b8b07 | 1556 | u_int len; |
30dcc918 | 1557 | int n_bytes; |
e78a59f5 | 1558 | |
653d5f86 | 1559 | if (no_pty_flag) { |
1560 | debug("Allocating a pty not permitted for this authentication."); | |
38c295d6 | 1561 | return 0; |
653d5f86 | 1562 | } |
1563 | if (s->ttyfd != -1) { | |
1564 | packet_disconnect("Protocol error: you already have a pty."); | |
6ae2364d | 1565 | return 0; |
653d5f86 | 1566 | } |
1567 | ||
e78a59f5 | 1568 | s->term = packet_get_string(&len); |
653d5f86 | 1569 | |
1570 | if (compat20) { | |
1571 | s->col = packet_get_int(); | |
1572 | s->row = packet_get_int(); | |
1573 | } else { | |
1574 | s->row = packet_get_int(); | |
1575 | s->col = packet_get_int(); | |
1576 | } | |
e78a59f5 | 1577 | s->xpixel = packet_get_int(); |
1578 | s->ypixel = packet_get_int(); | |
1579 | ||
1580 | if (strcmp(s->term, "") == 0) { | |
1581 | xfree(s->term); | |
1582 | s->term = NULL; | |
1583 | } | |
653d5f86 | 1584 | |
e78a59f5 | 1585 | /* Allocate a pty and open it. */ |
653d5f86 | 1586 | debug("Allocating pty."); |
e78a59f5 | 1587 | if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) { |
653d5f86 | 1588 | if (s->term) |
1589 | xfree(s->term); | |
e78a59f5 | 1590 | s->term = NULL; |
1591 | s->ptyfd = -1; | |
1592 | s->ttyfd = -1; | |
1593 | error("session_pty_req: session %d alloc failed", s->self); | |
6ae2364d | 1594 | return 0; |
e78a59f5 | 1595 | } |
1596 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); | |
653d5f86 | 1597 | |
1598 | /* for SSH1 the tty modes length is not given */ | |
1599 | if (!compat20) | |
1600 | n_bytes = packet_remaining(); | |
1601 | tty_parse_modes(s->ttyfd, &n_bytes); | |
1602 | ||
e78a59f5 | 1603 | /* |
1604 | * Add a cleanup function to clear the utmp entry and record logout | |
1605 | * time in case we call fatal() (e.g., the connection gets closed). | |
1606 | */ | |
86066315 | 1607 | fatal_add_cleanup(session_pty_cleanup, (void *)s); |
e78a59f5 | 1608 | pty_setowner(s->pw, s->tty); |
653d5f86 | 1609 | |
1610 | /* Set window size from the packet. */ | |
e78a59f5 | 1611 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
1612 | ||
30dcc918 | 1613 | packet_done(); |
1d1ffb87 | 1614 | session_proctitle(s); |
e78a59f5 | 1615 | return 1; |
1616 | } | |
1617 | ||
0b242b12 | 1618 | int |
1619 | session_subsystem_req(Session *s) | |
1620 | { | |
1e3b8b07 | 1621 | u_int len; |
0b242b12 | 1622 | int success = 0; |
1623 | char *subsys = packet_get_string(&len); | |
38c295d6 | 1624 | int i; |
0b242b12 | 1625 | |
1626 | packet_done(); | |
1627 | log("subsystem request for %s", subsys); | |
1628 | ||
38c295d6 | 1629 | for (i = 0; i < options.num_subsystems; i++) { |
1630 | if(strcmp(subsys, options.subsystem_name[i]) == 0) { | |
1631 | debug("subsystem: exec() %s", options.subsystem_command[i]); | |
e5d7a405 | 1632 | s->is_subsystem = 1; |
65068d16 | 1633 | do_exec_no_pty(s, options.subsystem_command[i]); |
38c295d6 | 1634 | success = 1; |
1635 | } | |
1636 | } | |
1637 | ||
1638 | if (!success) | |
1639 | log("subsystem request for %s failed, subsystem not found", subsys); | |
1640 | ||
0b242b12 | 1641 | xfree(subsys); |
1642 | return success; | |
1643 | } | |
1644 | ||
1645 | int | |
1646 | session_x11_req(Session *s) | |
1647 | { | |
8dcd9d5c | 1648 | int success; |
0b242b12 | 1649 | |
1650 | s->single_connection = packet_get_char(); | |
1651 | s->auth_proto = packet_get_string(NULL); | |
1652 | s->auth_data = packet_get_string(NULL); | |
1653 | s->screen = packet_get_int(); | |
1654 | packet_done(); | |
1655 | ||
8dcd9d5c | 1656 | success = session_setup_x11fwd(s); |
1657 | if (!success) { | |
0b242b12 | 1658 | xfree(s->auth_proto); |
1659 | xfree(s->auth_data); | |
1500bcdd | 1660 | s->auth_proto = NULL; |
1661 | s->auth_data = NULL; | |
0b242b12 | 1662 | } |
8dcd9d5c | 1663 | return success; |
0b242b12 | 1664 | } |
1665 | ||
38c295d6 | 1666 | int |
1667 | session_shell_req(Session *s) | |
1668 | { | |
1669 | /* if forced_command == NULL, the shell is execed */ | |
1670 | char *shell = forced_command; | |
1671 | packet_done(); | |
38c295d6 | 1672 | if (s->ttyfd == -1) |
65068d16 | 1673 | do_exec_no_pty(s, shell); |
38c295d6 | 1674 | else |
65068d16 | 1675 | do_exec_pty(s, shell); |
38c295d6 | 1676 | return 1; |
1677 | } | |
1678 | ||
1679 | int | |
1680 | session_exec_req(Session *s) | |
1681 | { | |
1e3b8b07 | 1682 | u_int len; |
38c295d6 | 1683 | char *command = packet_get_string(&len); |
1684 | packet_done(); | |
1685 | if (forced_command) { | |
b5e300c2 | 1686 | original_command = command; |
38c295d6 | 1687 | command = forced_command; |
1688 | debug("Forced command '%.500s'", forced_command); | |
1689 | } | |
38c295d6 | 1690 | if (s->ttyfd == -1) |
65068d16 | 1691 | do_exec_no_pty(s, command); |
38c295d6 | 1692 | else |
65068d16 | 1693 | do_exec_pty(s, command); |
38c295d6 | 1694 | if (forced_command == NULL) |
1695 | xfree(command); | |
1696 | return 1; | |
1697 | } | |
1698 | ||
fa08c86b | 1699 | int |
1700 | session_auth_agent_req(Session *s) | |
1701 | { | |
1702 | static int called = 0; | |
1703 | packet_done(); | |
d343d900 | 1704 | if (no_agent_forwarding_flag) { |
1705 | debug("session_auth_agent_req: no_agent_forwarding_flag"); | |
1706 | return 0; | |
1707 | } | |
fa08c86b | 1708 | if (called) { |
1709 | return 0; | |
1710 | } else { | |
1711 | called = 1; | |
1712 | return auth_input_request_forwarding(s->pw); | |
1713 | } | |
1714 | } | |
1715 | ||
e78a59f5 | 1716 | void |
1717 | session_input_channel_req(int id, void *arg) | |
1718 | { | |
1e3b8b07 | 1719 | u_int len; |
e78a59f5 | 1720 | int reply; |
1721 | int success = 0; | |
1722 | char *rtype; | |
1723 | Session *s; | |
1724 | Channel *c; | |
1725 | ||
1726 | rtype = packet_get_string(&len); | |
1727 | reply = packet_get_char(); | |
1728 | ||
1729 | s = session_by_channel(id); | |
1730 | if (s == NULL) | |
1731 | fatal("session_input_channel_req: channel %d: no session", id); | |
1732 | c = channel_lookup(id); | |
1733 | if (c == NULL) | |
1734 | fatal("session_input_channel_req: channel %d: bad channel", id); | |
1735 | ||
1736 | debug("session_input_channel_req: session %d channel %d request %s reply %d", | |
1737 | s->self, id, rtype, reply); | |
1738 | ||
1739 | /* | |
e5d7a405 | 1740 | * a session is in LARVAL state until a shell, a command |
1741 | * or a subsystem is executed | |
e78a59f5 | 1742 | */ |
1743 | if (c->type == SSH_CHANNEL_LARVAL) { | |
1744 | if (strcmp(rtype, "shell") == 0) { | |
38c295d6 | 1745 | success = session_shell_req(s); |
e78a59f5 | 1746 | } else if (strcmp(rtype, "exec") == 0) { |
38c295d6 | 1747 | success = session_exec_req(s); |
e78a59f5 | 1748 | } else if (strcmp(rtype, "pty-req") == 0) { |
35484284 | 1749 | success = session_pty_req(s); |
0b242b12 | 1750 | } else if (strcmp(rtype, "x11-req") == 0) { |
1751 | success = session_x11_req(s); | |
fa08c86b | 1752 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
1753 | success = session_auth_agent_req(s); | |
0b242b12 | 1754 | } else if (strcmp(rtype, "subsystem") == 0) { |
1755 | success = session_subsystem_req(s); | |
e78a59f5 | 1756 | } |
1757 | } | |
1758 | if (strcmp(rtype, "window-change") == 0) { | |
1759 | success = session_window_change_req(s); | |
1760 | } | |
1761 | ||
1762 | if (reply) { | |
1763 | packet_start(success ? | |
1764 | SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE); | |
1765 | packet_put_int(c->remote_id); | |
1766 | packet_send(); | |
1767 | } | |
1768 | xfree(rtype); | |
1769 | } | |
1770 | ||
1771 | void | |
1772 | session_set_fds(Session *s, int fdin, int fdout, int fderr) | |
1773 | { | |
1774 | if (!compat20) | |
1775 | fatal("session_set_fds: called for proto != 2.0"); | |
1776 | /* | |
1777 | * now that have a child and a pipe to the child, | |
1778 | * we can activate our channel and register the fd's | |
1779 | */ | |
1780 | if (s->chanid == -1) | |
1781 | fatal("no channel for session %d", s->self); | |
1782 | channel_set_fds(s->chanid, | |
1783 | fdout, fdin, fderr, | |
a22aff1f | 1784 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
1785 | 1); | |
e78a59f5 | 1786 | } |
1787 | ||
86066315 | 1788 | /* |
1789 | * Function to perform pty cleanup. Also called if we get aborted abnormally | |
1790 | * (e.g., due to a dropped connection). | |
1791 | */ | |
7368a6c8 | 1792 | void |
86066315 | 1793 | session_pty_cleanup(void *session) |
7368a6c8 | 1794 | { |
86066315 | 1795 | Session *s = session; |
1796 | ||
1797 | if (s == NULL) { | |
1798 | error("session_pty_cleanup: no session"); | |
1799 | return; | |
1800 | } | |
1801 | if (s->ttyfd == -1) | |
7368a6c8 | 1802 | return; |
1803 | ||
0725ea77 | 1804 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
7368a6c8 | 1805 | |
7368a6c8 | 1806 | /* Record that the user has logged out. */ |
86066315 | 1807 | if (s->pid != 0) |
1808 | record_logout(s->pid, s->tty); | |
7368a6c8 | 1809 | |
1810 | /* Release the pseudo-tty. */ | |
1811 | pty_release(s->tty); | |
1812 | ||
1813 | /* | |
1814 | * Close the server side of the socket pairs. We must do this after | |
1815 | * the pty cleanup, so that another process doesn't get this pty | |
1816 | * while we're still cleaning up. | |
1817 | */ | |
1818 | if (close(s->ptymaster) < 0) | |
1819 | error("close(s->ptymaster): %s", strerror(errno)); | |
1820 | } | |
e78a59f5 | 1821 | |
1822 | void | |
1823 | session_exit_message(Session *s, int status) | |
1824 | { | |
1825 | Channel *c; | |
1826 | if (s == NULL) | |
1827 | fatal("session_close: no session"); | |
1828 | c = channel_lookup(s->chanid); | |
1829 | if (c == NULL) | |
86066315 | 1830 | fatal("session_exit_message: session %d: no channel %d", |
e78a59f5 | 1831 | s->self, s->chanid); |
1832 | debug("session_exit_message: session %d channel %d pid %d", | |
1833 | s->self, s->chanid, s->pid); | |
1834 | ||
1835 | if (WIFEXITED(status)) { | |
1836 | channel_request_start(s->chanid, | |
1837 | "exit-status", 0); | |
1838 | packet_put_int(WEXITSTATUS(status)); | |
1839 | packet_send(); | |
1840 | } else if (WIFSIGNALED(status)) { | |
1841 | channel_request_start(s->chanid, | |
1842 | "exit-signal", 0); | |
1843 | packet_put_int(WTERMSIG(status)); | |
a64009ad | 1844 | #ifdef WCOREDUMP |
e78a59f5 | 1845 | packet_put_char(WCOREDUMP(status)); |
a64009ad | 1846 | #else /* WCOREDUMP */ |
1847 | packet_put_char(0); | |
1848 | #endif /* WCOREDUMP */ | |
e78a59f5 | 1849 | packet_put_cstring(""); |
1850 | packet_put_cstring(""); | |
1851 | packet_send(); | |
1852 | } else { | |
1853 | /* Some weird exit cause. Just exit. */ | |
1854 | packet_disconnect("wait returned status %04x.", status); | |
1855 | } | |
1856 | ||
1857 | /* disconnect channel */ | |
1858 | debug("session_exit_message: release channel %d", s->chanid); | |
1859 | channel_cancel_cleanup(s->chanid); | |
9da5c3c9 | 1860 | /* |
1861 | * emulate a write failure with 'chan_write_failed', nobody will be | |
1862 | * interested in data we write. | |
1863 | * Note that we must not call 'chan_read_failed', since there could | |
1864 | * be some more data waiting in the pipe. | |
1865 | */ | |
0b242b12 | 1866 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
1867 | chan_write_failed(c); | |
e78a59f5 | 1868 | s->chanid = -1; |
1869 | } | |
1870 | ||
1871 | void | |
86066315 | 1872 | session_close(Session *s) |
e78a59f5 | 1873 | { |
86066315 | 1874 | debug("session_close: session %d pid %d", s->self, s->pid); |
1875 | if (s->ttyfd != -1) { | |
1876 | fatal_remove_cleanup(session_pty_cleanup, (void *)s); | |
1877 | session_pty_cleanup(s); | |
1878 | } | |
e78a59f5 | 1879 | if (s->term) |
1880 | xfree(s->term); | |
1881 | if (s->display) | |
1882 | xfree(s->display); | |
1883 | if (s->auth_data) | |
1884 | xfree(s->auth_data); | |
1885 | if (s->auth_proto) | |
1886 | xfree(s->auth_proto); | |
1887 | s->used = 0; | |
1d1ffb87 | 1888 | session_proctitle(s); |
e78a59f5 | 1889 | } |
1890 | ||
1891 | void | |
1892 | session_close_by_pid(pid_t pid, int status) | |
1893 | { | |
1894 | Session *s = session_by_pid(pid); | |
1895 | if (s == NULL) { | |
eb26141e | 1896 | debug("session_close_by_pid: no session for pid %d", pid); |
e78a59f5 | 1897 | return; |
1898 | } | |
1899 | if (s->chanid != -1) | |
1900 | session_exit_message(s, status); | |
1901 | session_close(s); | |
1902 | } | |
1903 | ||
1904 | /* | |
1905 | * this is called when a channel dies before | |
1906 | * the session 'child' itself dies | |
1907 | */ | |
1908 | void | |
1909 | session_close_by_channel(int id, void *arg) | |
1910 | { | |
1911 | Session *s = session_by_channel(id); | |
1912 | if (s == NULL) { | |
1913 | debug("session_close_by_channel: no session for channel %d", id); | |
1914 | return; | |
1915 | } | |
1916 | /* disconnect channel */ | |
1917 | channel_cancel_cleanup(s->chanid); | |
1918 | s->chanid = -1; | |
1919 | ||
1920 | debug("session_close_by_channel: channel %d kill %d", id, s->pid); | |
1921 | if (s->pid == 0) { | |
1922 | /* close session immediately */ | |
1923 | session_close(s); | |
1924 | } else { | |
1925 | /* notify child, delay session cleanup */ | |
512ad3c0 | 1926 | if (kill(s->pid, (s->ttyfd == -1) ? SIGTERM : SIGHUP) < 0) |
e78a59f5 | 1927 | error("session_close_by_channel: kill %d: %s", |
1928 | s->pid, strerror(errno)); | |
1929 | } | |
1930 | } | |
1931 | ||
1d1ffb87 | 1932 | char * |
1933 | session_tty_list(void) | |
1934 | { | |
1935 | static char buf[1024]; | |
1936 | int i; | |
1937 | buf[0] = '\0'; | |
1938 | for(i = 0; i < MAX_SESSIONS; i++) { | |
1939 | Session *s = &sessions[i]; | |
1940 | if (s->used && s->ttyfd != -1) { | |
1941 | if (buf[0] != '\0') | |
1942 | strlcat(buf, ",", sizeof buf); | |
1943 | strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf); | |
1944 | } | |
1945 | } | |
1946 | if (buf[0] == '\0') | |
1947 | strlcpy(buf, "notty", sizeof buf); | |
1948 | return buf; | |
1949 | } | |
1950 | ||
1951 | void | |
1952 | session_proctitle(Session *s) | |
1953 | { | |
1954 | if (s->pw == NULL) | |
1955 | error("no user for session %d", s->self); | |
1956 | else | |
1957 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); | |
1958 | } | |
1959 | ||
8dcd9d5c | 1960 | int |
1961 | session_setup_x11fwd(Session *s) | |
1962 | { | |
8dcd9d5c | 1963 | struct stat st; |
1964 | ||
1965 | if (no_x11_forwarding_flag) { | |
1966 | packet_send_debug("X11 forwarding disabled in user configuration file."); | |
1967 | return 0; | |
1968 | } | |
1969 | if (!options.x11_forwarding) { | |
1970 | debug("X11 forwarding disabled in server configuration file."); | |
1971 | return 0; | |
1972 | } | |
1973 | if (!options.xauth_location || | |
1974 | (stat(options.xauth_location, &st) == -1)) { | |
1975 | packet_send_debug("No xauth program; cannot forward with spoofing."); | |
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 | ||
e78a59f5 | 1990 | void |
59c97189 | 1991 | do_authenticated2(Authctxt *authctxt) |
e78a59f5 | 1992 | { |
e78a59f5 | 1993 | server_loop2(); |
1994 | } |