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1 | /* | |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * Ssh client program. This program can be used to log into a remote machine. | |
6 | * The software supports strong authentication, encryption, and forwarding | |
7 | * of X11, TCP/IP, and authentication connections. | |
8 | * | |
9 | * As far as I am concerned, the code I have written for this software | |
10 | * can be used freely for any purpose. Any derived versions of this | |
11 | * software must be clearly marked as such, and if the derived work is | |
12 | * incompatible with the protocol description in the RFC file, it must be | |
13 | * called by a name other than "ssh" or "Secure Shell". | |
14 | * | |
15 | * Copyright (c) 1999 Niels Provos. All rights reserved. | |
16 | * | |
17 | * Modified to work with SSL by Niels Provos <provos@citi.umich.edu> | |
18 | * in Canada (German citizen). | |
19 | * | |
20 | * Redistribution and use in source and binary forms, with or without | |
21 | * modification, are permitted provided that the following conditions | |
22 | * are met: | |
23 | * 1. Redistributions of source code must retain the above copyright | |
24 | * notice, this list of conditions and the following disclaimer. | |
25 | * 2. Redistributions in binary form must reproduce the above copyright | |
26 | * notice, this list of conditions and the following disclaimer in the | |
27 | * documentation and/or other materials provided with the distribution. | |
28 | * | |
29 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
30 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
31 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
32 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
33 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
34 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
35 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
36 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
37 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
38 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
39 | */ | |
40 | ||
41 | #include "includes.h" | |
42 | RCSID("$OpenBSD: ssh.c,v 1.126 2001/06/23 15:12:21 itojun Exp $"); | |
43 | ||
44 | #include <openssl/evp.h> | |
45 | #include <openssl/err.h> | |
46 | ||
47 | #include "ssh.h" | |
48 | #include "ssh1.h" | |
49 | #include "ssh2.h" | |
50 | #include "compat.h" | |
51 | #include "cipher.h" | |
52 | #include "xmalloc.h" | |
53 | #include "packet.h" | |
54 | #include "buffer.h" | |
55 | #include "uidswap.h" | |
56 | #include "channels.h" | |
57 | #include "key.h" | |
58 | #include "authfd.h" | |
59 | #include "authfile.h" | |
60 | #include "pathnames.h" | |
61 | #include "clientloop.h" | |
62 | #include "log.h" | |
63 | #include "readconf.h" | |
64 | #include "sshconnect.h" | |
65 | #include "tildexpand.h" | |
66 | #include "dispatch.h" | |
67 | #include "misc.h" | |
68 | #include "kex.h" | |
69 | #include "mac.h" | |
70 | #include "sshtty.h" | |
71 | ||
72 | #ifdef HAVE___PROGNAME | |
73 | extern char *__progname; | |
74 | #else | |
75 | char *__progname; | |
76 | #endif | |
77 | ||
78 | /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. | |
79 | Default value is AF_UNSPEC means both IPv4 and IPv6. */ | |
80 | #ifdef IPV4_DEFAULT | |
81 | int IPv4or6 = AF_INET; | |
82 | #else | |
83 | int IPv4or6 = AF_UNSPEC; | |
84 | #endif | |
85 | ||
86 | /* Flag indicating whether debug mode is on. This can be set on the command line. */ | |
87 | int debug_flag = 0; | |
88 | ||
89 | /* Flag indicating whether a tty should be allocated */ | |
90 | int tty_flag = 0; | |
91 | int no_tty_flag = 0; | |
92 | int force_tty_flag = 0; | |
93 | ||
94 | /* don't exec a shell */ | |
95 | int no_shell_flag = 0; | |
96 | ||
97 | /* | |
98 | * Flag indicating that nothing should be read from stdin. This can be set | |
99 | * on the command line. | |
100 | */ | |
101 | int stdin_null_flag = 0; | |
102 | ||
103 | /* | |
104 | * Flag indicating that ssh should fork after authentication. This is useful | |
105 | * so that the pasphrase can be entered manually, and then ssh goes to the | |
106 | * background. | |
107 | */ | |
108 | int fork_after_authentication_flag = 0; | |
109 | ||
110 | /* | |
111 | * General data structure for command line options and options configurable | |
112 | * in configuration files. See readconf.h. | |
113 | */ | |
114 | Options options; | |
115 | ||
116 | /* | |
117 | * Name of the host we are connecting to. This is the name given on the | |
118 | * command line, or the HostName specified for the user-supplied name in a | |
119 | * configuration file. | |
120 | */ | |
121 | char *host; | |
122 | ||
123 | /* socket address the host resolves to */ | |
124 | struct sockaddr_storage hostaddr; | |
125 | ||
126 | /* | |
127 | * Flag to indicate that we have received a window change signal which has | |
128 | * not yet been processed. This will cause a message indicating the new | |
129 | * window size to be sent to the server a little later. This is volatile | |
130 | * because this is updated in a signal handler. | |
131 | */ | |
132 | volatile int received_window_change_signal = 0; | |
133 | ||
134 | /* Private host keys. */ | |
135 | struct { | |
136 | Key **keys; | |
137 | int nkeys; | |
138 | } sensitive_data; | |
139 | ||
140 | /* Original real UID. */ | |
141 | uid_t original_real_uid; | |
142 | ||
143 | /* command to be executed */ | |
144 | Buffer command; | |
145 | ||
146 | /* Should we execute a command or invoke a subsystem? */ | |
147 | int subsystem_flag = 0; | |
148 | ||
149 | /* Prints a help message to the user. This function never returns. */ | |
150 | ||
151 | static void | |
152 | usage(void) | |
153 | { | |
154 | fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); | |
155 | fprintf(stderr, "Options:\n"); | |
156 | fprintf(stderr, " -l user Log in using this user name.\n"); | |
157 | fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); | |
158 | fprintf(stderr, " -A Enable authentication agent forwarding.\n"); | |
159 | fprintf(stderr, " -a Disable authentication agent forwarding (default).\n"); | |
160 | #ifdef AFS | |
161 | fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); | |
162 | #endif /* AFS */ | |
163 | fprintf(stderr, " -X Enable X11 connection forwarding.\n"); | |
164 | fprintf(stderr, " -x Disable X11 connection forwarding (default).\n"); | |
165 | fprintf(stderr, " -i file Identity for public key authentication " | |
166 | "(default: ~/.ssh/identity)\n"); | |
167 | fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); | |
168 | fprintf(stderr, " -T Do not allocate a tty.\n"); | |
169 | fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); | |
170 | fprintf(stderr, " Multiple -v increases verbosity.\n"); | |
171 | fprintf(stderr, " -V Display version number only.\n"); | |
172 | fprintf(stderr, " -P Don't allocate a privileged port.\n"); | |
173 | fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); | |
174 | fprintf(stderr, " -f Fork into background after authentication.\n"); | |
175 | fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); | |
176 | ||
177 | fprintf(stderr, " -c cipher Select encryption algorithm\n"); | |
178 | fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); | |
179 | fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); | |
180 | fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); | |
181 | fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); | |
182 | fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); | |
183 | fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); | |
184 | fprintf(stderr, " -C Enable compression.\n"); | |
185 | fprintf(stderr, " -N Do not execute a shell or command.\n"); | |
186 | fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); | |
187 | fprintf(stderr, " -1 Force protocol version 1.\n"); | |
188 | fprintf(stderr, " -2 Force protocol version 2.\n"); | |
189 | fprintf(stderr, " -4 Use IPv4 only.\n"); | |
190 | fprintf(stderr, " -6 Use IPv6 only.\n"); | |
191 | fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); | |
192 | fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); | |
193 | fprintf(stderr, " -b addr Local IP address.\n"); | |
194 | exit(1); | |
195 | } | |
196 | ||
197 | /* | |
198 | * Connects to the given host using rsh (or prints an error message and exits | |
199 | * if rsh is not available). This function never returns. | |
200 | */ | |
201 | static void | |
202 | rsh_connect(char *host, char *user, Buffer * command) | |
203 | { | |
204 | char *args[10]; | |
205 | int i; | |
206 | ||
207 | log("Using rsh. WARNING: Connection will not be encrypted."); | |
208 | /* Build argument list for rsh. */ | |
209 | i = 0; | |
210 | args[i++] = _PATH_RSH; | |
211 | /* host may have to come after user on some systems */ | |
212 | args[i++] = host; | |
213 | if (user) { | |
214 | args[i++] = "-l"; | |
215 | args[i++] = user; | |
216 | } | |
217 | if (buffer_len(command) > 0) { | |
218 | buffer_append(command, "\0", 1); | |
219 | args[i++] = buffer_ptr(command); | |
220 | } | |
221 | args[i++] = NULL; | |
222 | if (debug_flag) { | |
223 | for (i = 0; args[i]; i++) { | |
224 | if (i != 0) | |
225 | fprintf(stderr, " "); | |
226 | fprintf(stderr, "%s", args[i]); | |
227 | } | |
228 | fprintf(stderr, "\n"); | |
229 | } | |
230 | execv(_PATH_RSH, args); | |
231 | perror(_PATH_RSH); | |
232 | exit(1); | |
233 | } | |
234 | ||
235 | static int ssh_session(void); | |
236 | static int ssh_session2(void); | |
237 | static void load_public_identity_files(void); | |
238 | ||
239 | /* | |
240 | * Main program for the ssh client. | |
241 | */ | |
242 | int | |
243 | main(int ac, char **av) | |
244 | { | |
245 | int i, opt, optind, exit_status, ok; | |
246 | u_short fwd_port, fwd_host_port; | |
247 | char *optarg, *p, *cp, buf[256]; | |
248 | struct stat st; | |
249 | struct passwd *pw; | |
250 | int dummy; | |
251 | uid_t original_effective_uid; | |
252 | ||
253 | __progname = get_progname(av[0]); | |
254 | init_rng(); | |
255 | ||
256 | /* | |
257 | * Save the original real uid. It will be needed later (uid-swapping | |
258 | * may clobber the real uid). | |
259 | */ | |
260 | original_real_uid = getuid(); | |
261 | original_effective_uid = geteuid(); | |
262 | ||
263 | #ifdef HAVE_SETRLIMIT | |
264 | /* If we are installed setuid root be careful to not drop core. */ | |
265 | if (original_real_uid != original_effective_uid) { | |
266 | struct rlimit rlim; | |
267 | rlim.rlim_cur = rlim.rlim_max = 0; | |
268 | if (setrlimit(RLIMIT_CORE, &rlim) < 0) | |
269 | fatal("setrlimit failed: %.100s", strerror(errno)); | |
270 | } | |
271 | #endif | |
272 | /* Get user data. */ | |
273 | pw = getpwuid(original_real_uid); | |
274 | if (!pw) { | |
275 | log("You don't exist, go away!"); | |
276 | exit(1); | |
277 | } | |
278 | /* Take a copy of the returned structure. */ | |
279 | pw = pwcopy(pw); | |
280 | ||
281 | /* | |
282 | * Use uid-swapping to give up root privileges for the duration of | |
283 | * option processing. We will re-instantiate the rights when we are | |
284 | * ready to create the privileged port, and will permanently drop | |
285 | * them when the port has been created (actually, when the connection | |
286 | * has been made, as we may need to create the port several times). | |
287 | */ | |
288 | temporarily_use_uid(pw); | |
289 | ||
290 | /* | |
291 | * Set our umask to something reasonable, as some files are created | |
292 | * with the default umask. This will make them world-readable but | |
293 | * writable only by the owner, which is ok for all files for which we | |
294 | * don't set the modes explicitly. | |
295 | */ | |
296 | umask(022); | |
297 | ||
298 | /* Initialize option structure to indicate that no values have been set. */ | |
299 | initialize_options(&options); | |
300 | ||
301 | /* Parse command-line arguments. */ | |
302 | host = NULL; | |
303 | ||
304 | for (optind = 1; optind < ac; optind++) { | |
305 | if (av[optind][0] != '-') { | |
306 | if (host) | |
307 | break; | |
308 | if (strchr(av[optind], '@')) { | |
309 | p = xstrdup(av[optind]); | |
310 | cp = strchr(p, '@'); | |
311 | if(cp == NULL || cp == p) | |
312 | usage(); | |
313 | options.user = p; | |
314 | *cp = '\0'; | |
315 | host = ++cp; | |
316 | } else | |
317 | host = av[optind]; | |
318 | continue; | |
319 | } | |
320 | opt = av[optind][1]; | |
321 | if (!opt) | |
322 | usage(); | |
323 | if (strchr("eilcmpbLRDo", opt)) { /* options with arguments */ | |
324 | optarg = av[optind] + 2; | |
325 | if (strcmp(optarg, "") == 0) { | |
326 | if (optind >= ac - 1) | |
327 | usage(); | |
328 | optarg = av[++optind]; | |
329 | } | |
330 | } else { | |
331 | if (av[optind][2]) | |
332 | usage(); | |
333 | optarg = NULL; | |
334 | } | |
335 | switch (opt) { | |
336 | case '1': | |
337 | options.protocol = SSH_PROTO_1; | |
338 | break; | |
339 | case '2': | |
340 | options.protocol = SSH_PROTO_2; | |
341 | break; | |
342 | case '4': | |
343 | IPv4or6 = AF_INET; | |
344 | break; | |
345 | case '6': | |
346 | IPv4or6 = AF_INET6; | |
347 | break; | |
348 | case 'n': | |
349 | stdin_null_flag = 1; | |
350 | break; | |
351 | case 'f': | |
352 | fork_after_authentication_flag = 1; | |
353 | stdin_null_flag = 1; | |
354 | break; | |
355 | case 'x': | |
356 | options.forward_x11 = 0; | |
357 | break; | |
358 | case 'X': | |
359 | options.forward_x11 = 1; | |
360 | break; | |
361 | case 'g': | |
362 | options.gateway_ports = 1; | |
363 | break; | |
364 | case 'P': | |
365 | options.use_privileged_port = 0; | |
366 | break; | |
367 | case 'a': | |
368 | options.forward_agent = 0; | |
369 | break; | |
370 | case 'A': | |
371 | options.forward_agent = 1; | |
372 | break; | |
373 | #ifdef AFS | |
374 | case 'k': | |
375 | options.kerberos_tgt_passing = 0; | |
376 | options.afs_token_passing = 0; | |
377 | break; | |
378 | #endif | |
379 | case 'i': | |
380 | if (stat(optarg, &st) < 0) { | |
381 | fprintf(stderr, "Warning: Identity file %s does not exist.\n", | |
382 | optarg); | |
383 | break; | |
384 | } | |
385 | if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES) | |
386 | fatal("Too many identity files specified (max %d)", | |
387 | SSH_MAX_IDENTITY_FILES); | |
388 | options.identity_files[options.num_identity_files++] = xstrdup(optarg); | |
389 | break; | |
390 | case 't': | |
391 | if (tty_flag) | |
392 | force_tty_flag = 1; | |
393 | tty_flag = 1; | |
394 | break; | |
395 | case 'v': | |
396 | if (0 == debug_flag) { | |
397 | debug_flag = 1; | |
398 | options.log_level = SYSLOG_LEVEL_DEBUG1; | |
399 | } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { | |
400 | options.log_level++; | |
401 | break; | |
402 | } else { | |
403 | fatal("Too high debugging level."); | |
404 | } | |
405 | /* fallthrough */ | |
406 | case 'V': | |
407 | fprintf(stderr, | |
408 | "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", | |
409 | SSH_VERSION, | |
410 | PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, | |
411 | PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, | |
412 | SSLeay()); | |
413 | if (opt == 'V') | |
414 | exit(0); | |
415 | break; | |
416 | case 'q': | |
417 | options.log_level = SYSLOG_LEVEL_QUIET; | |
418 | break; | |
419 | case 'e': | |
420 | if (optarg[0] == '^' && optarg[2] == 0 && | |
421 | (u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128) | |
422 | options.escape_char = (u_char) optarg[1] & 31; | |
423 | else if (strlen(optarg) == 1) | |
424 | options.escape_char = (u_char) optarg[0]; | |
425 | else if (strcmp(optarg, "none") == 0) | |
426 | options.escape_char = SSH_ESCAPECHAR_NONE; | |
427 | else { | |
428 | fprintf(stderr, "Bad escape character '%s'.\n", optarg); | |
429 | exit(1); | |
430 | } | |
431 | break; | |
432 | case 'c': | |
433 | if (ciphers_valid(optarg)) { | |
434 | /* SSH2 only */ | |
435 | options.ciphers = xstrdup(optarg); | |
436 | options.cipher = SSH_CIPHER_ILLEGAL; | |
437 | } else { | |
438 | /* SSH1 only */ | |
439 | options.cipher = cipher_number(optarg); | |
440 | if (options.cipher == -1) { | |
441 | fprintf(stderr, "Unknown cipher type '%s'\n", optarg); | |
442 | exit(1); | |
443 | } | |
444 | if (options.cipher == SSH_CIPHER_3DES) { | |
445 | options.ciphers = "3des-cbc"; | |
446 | } else if (options.cipher == SSH_CIPHER_BLOWFISH) { | |
447 | options.ciphers = "blowfish-cbc"; | |
448 | } else { | |
449 | options.ciphers = (char *)-1; | |
450 | } | |
451 | } | |
452 | break; | |
453 | case 'm': | |
454 | if (mac_valid(optarg)) | |
455 | options.macs = xstrdup(optarg); | |
456 | else { | |
457 | fprintf(stderr, "Unknown mac type '%s'\n", optarg); | |
458 | exit(1); | |
459 | } | |
460 | break; | |
461 | case 'p': | |
462 | options.port = a2port(optarg); | |
463 | if (options.port == 0) { | |
464 | fprintf(stderr, "Bad port '%s'\n", optarg); | |
465 | exit(1); | |
466 | } | |
467 | break; | |
468 | case 'l': | |
469 | options.user = optarg; | |
470 | break; | |
471 | case 'R': | |
472 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, | |
473 | &fwd_host_port) != 3 && | |
474 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
475 | &fwd_host_port) != 3) { | |
476 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); | |
477 | usage(); | |
478 | /* NOTREACHED */ | |
479 | } | |
480 | add_remote_forward(&options, fwd_port, buf, fwd_host_port); | |
481 | break; | |
482 | case 'L': | |
483 | if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf, | |
484 | &fwd_host_port) != 3 && | |
485 | sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf, | |
486 | &fwd_host_port) != 3) { | |
487 | fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg); | |
488 | usage(); | |
489 | /* NOTREACHED */ | |
490 | } | |
491 | add_local_forward(&options, fwd_port, buf, fwd_host_port); | |
492 | break; | |
493 | ||
494 | case 'D': | |
495 | fwd_port = a2port(optarg); | |
496 | if (fwd_port == 0) { | |
497 | fprintf(stderr, "Bad dynamic port '%s'\n", optarg); | |
498 | exit(1); | |
499 | } | |
500 | add_local_forward(&options, fwd_port, "socks4", 0); | |
501 | break; | |
502 | ||
503 | case 'C': | |
504 | options.compression = 1; | |
505 | break; | |
506 | case 'N': | |
507 | no_shell_flag = 1; | |
508 | no_tty_flag = 1; | |
509 | break; | |
510 | case 'T': | |
511 | no_tty_flag = 1; | |
512 | break; | |
513 | case 'o': | |
514 | dummy = 1; | |
515 | if (process_config_line(&options, host ? host : "", optarg, | |
516 | "command-line", 0, &dummy) != 0) | |
517 | exit(1); | |
518 | break; | |
519 | case 's': | |
520 | subsystem_flag = 1; | |
521 | break; | |
522 | case 'b': | |
523 | options.bind_address = optarg; | |
524 | break; | |
525 | default: | |
526 | usage(); | |
527 | } | |
528 | } | |
529 | ||
530 | /* Check that we got a host name. */ | |
531 | if (!host) | |
532 | usage(); | |
533 | ||
534 | SSLeay_add_all_algorithms(); | |
535 | ERR_load_crypto_strings(); | |
536 | ||
537 | /* Initialize the command to execute on remote host. */ | |
538 | buffer_init(&command); | |
539 | ||
540 | /* | |
541 | * Save the command to execute on the remote host in a buffer. There | |
542 | * is no limit on the length of the command, except by the maximum | |
543 | * packet size. Also sets the tty flag if there is no command. | |
544 | */ | |
545 | if (optind == ac) { | |
546 | /* No command specified - execute shell on a tty. */ | |
547 | tty_flag = 1; | |
548 | if (subsystem_flag) { | |
549 | fprintf(stderr, "You must specify a subsystem to invoke.\n"); | |
550 | usage(); | |
551 | } | |
552 | } else { | |
553 | /* A command has been specified. Store it into the | |
554 | buffer. */ | |
555 | for (i = optind; i < ac; i++) { | |
556 | if (i > optind) | |
557 | buffer_append(&command, " ", 1); | |
558 | buffer_append(&command, av[i], strlen(av[i])); | |
559 | } | |
560 | } | |
561 | ||
562 | /* Cannot fork to background if no command. */ | |
563 | if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag) | |
564 | fatal("Cannot fork into background without a command to execute."); | |
565 | ||
566 | /* Allocate a tty by default if no command specified. */ | |
567 | if (buffer_len(&command) == 0) | |
568 | tty_flag = 1; | |
569 | ||
570 | /* Force no tty*/ | |
571 | if (no_tty_flag) | |
572 | tty_flag = 0; | |
573 | /* Do not allocate a tty if stdin is not a tty. */ | |
574 | if (!isatty(fileno(stdin)) && !force_tty_flag) { | |
575 | if (tty_flag) | |
576 | log("Pseudo-terminal will not be allocated because stdin is not a terminal."); | |
577 | tty_flag = 0; | |
578 | } | |
579 | ||
580 | /* | |
581 | * Initialize "log" output. Since we are the client all output | |
582 | * actually goes to stderr. | |
583 | */ | |
584 | log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, | |
585 | SYSLOG_FACILITY_USER, 1); | |
586 | ||
587 | /* Read per-user configuration file. */ | |
588 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE); | |
589 | read_config_file(buf, host, &options); | |
590 | ||
591 | /* Read systemwide configuration file. */ | |
592 | read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); | |
593 | ||
594 | /* Fill configuration defaults. */ | |
595 | fill_default_options(&options); | |
596 | ||
597 | /* reinit */ | |
598 | log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); | |
599 | ||
600 | seed_rng(); | |
601 | ||
602 | if (options.user == NULL) | |
603 | options.user = xstrdup(pw->pw_name); | |
604 | ||
605 | if (options.hostname != NULL) | |
606 | host = options.hostname; | |
607 | ||
608 | /* Disable rhosts authentication if not running as root. */ | |
609 | #ifdef HAVE_CYGWIN | |
610 | /* Ignore uid if running under Windows */ | |
611 | if (!options.use_privileged_port) { | |
612 | #else | |
613 | if (original_effective_uid != 0 || !options.use_privileged_port) { | |
614 | #endif | |
615 | debug("Rhosts Authentication disabled, " | |
616 | "originating port will not be trusted."); | |
617 | options.rhosts_authentication = 0; | |
618 | } | |
619 | ||
620 | /* | |
621 | * If using rsh has been selected, exec it now (without trying | |
622 | * anything else). Note that we must release privileges first. | |
623 | */ | |
624 | if (options.use_rsh) { | |
625 | /* | |
626 | * Restore our superuser privileges. This must be done | |
627 | * before permanently setting the uid. | |
628 | */ | |
629 | restore_uid(); | |
630 | ||
631 | /* Switch to the original uid permanently. */ | |
632 | permanently_set_uid(pw); | |
633 | ||
634 | /* Execute rsh. */ | |
635 | rsh_connect(host, options.user, &command); | |
636 | fatal("rsh_connect returned"); | |
637 | } | |
638 | /* Restore our superuser privileges. */ | |
639 | restore_uid(); | |
640 | ||
641 | /* Open a connection to the remote host. */ | |
642 | ||
643 | ok = ssh_connect(host, &hostaddr, options.port, | |
644 | options.connection_attempts, | |
645 | original_effective_uid != 0 || !options.use_privileged_port, | |
646 | pw, options.proxy_command); | |
647 | ||
648 | /* | |
649 | * If we successfully made the connection, load the host private key | |
650 | * in case we will need it later for combined rsa-rhosts | |
651 | * authentication. This must be done before releasing extra | |
652 | * privileges, because the file is only readable by root. | |
653 | */ | |
654 | sensitive_data.nkeys = 0; | |
655 | sensitive_data.keys = NULL; | |
656 | if (ok && (options.rhosts_rsa_authentication || | |
657 | options.hostbased_authentication)) { | |
658 | sensitive_data.nkeys = 3; | |
659 | sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key)); | |
660 | sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, | |
661 | _PATH_HOST_KEY_FILE, "", NULL); | |
662 | sensitive_data.keys[1] = key_load_private_type(KEY_DSA, | |
663 | _PATH_HOST_DSA_KEY_FILE, "", NULL); | |
664 | sensitive_data.keys[2] = key_load_private_type(KEY_RSA, | |
665 | _PATH_HOST_RSA_KEY_FILE, "", NULL); | |
666 | } | |
667 | /* | |
668 | * Get rid of any extra privileges that we may have. We will no | |
669 | * longer need them. Also, extra privileges could make it very hard | |
670 | * to read identity files and other non-world-readable files from the | |
671 | * user's home directory if it happens to be on a NFS volume where | |
672 | * root is mapped to nobody. | |
673 | */ | |
674 | ||
675 | /* | |
676 | * Note that some legacy systems need to postpone the following call | |
677 | * to permanently_set_uid() until the private hostkey is destroyed | |
678 | * with RSA_free(). Otherwise the calling user could ptrace() the | |
679 | * process, read the private hostkey and impersonate the host. | |
680 | * OpenBSD does not allow ptracing of setuid processes. | |
681 | */ | |
682 | permanently_set_uid(pw); | |
683 | ||
684 | /* | |
685 | * Now that we are back to our own permissions, create ~/.ssh | |
686 | * directory if it doesn\'t already exist. | |
687 | */ | |
688 | snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR); | |
689 | if (stat(buf, &st) < 0) | |
690 | if (mkdir(buf, 0700) < 0) | |
691 | error("Could not create directory '%.200s'.", buf); | |
692 | ||
693 | /* Check if the connection failed, and try "rsh" if appropriate. */ | |
694 | if (!ok) { | |
695 | if (options.port != 0) | |
696 | log("Secure connection to %.100s on port %hu refused%.100s.", | |
697 | host, options.port, | |
698 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
699 | else | |
700 | log("Secure connection to %.100s refused%.100s.", host, | |
701 | options.fallback_to_rsh ? "; reverting to insecure method" : ""); | |
702 | ||
703 | if (options.fallback_to_rsh) { | |
704 | rsh_connect(host, options.user, &command); | |
705 | fatal("rsh_connect returned"); | |
706 | } | |
707 | exit(1); | |
708 | } | |
709 | /* load options.identity_files */ | |
710 | load_public_identity_files(); | |
711 | ||
712 | /* Expand ~ in known host file names. */ | |
713 | /* XXX mem-leaks: */ | |
714 | options.system_hostfile = | |
715 | tilde_expand_filename(options.system_hostfile, original_real_uid); | |
716 | options.user_hostfile = | |
717 | tilde_expand_filename(options.user_hostfile, original_real_uid); | |
718 | options.system_hostfile2 = | |
719 | tilde_expand_filename(options.system_hostfile2, original_real_uid); | |
720 | options.user_hostfile2 = | |
721 | tilde_expand_filename(options.user_hostfile2, original_real_uid); | |
722 | ||
723 | /* Log into the remote system. This never returns if the login fails. */ | |
724 | ssh_login(sensitive_data.keys, sensitive_data.nkeys, | |
725 | host, (struct sockaddr *)&hostaddr, pw); | |
726 | ||
727 | /* We no longer need the private host keys. Clear them now. */ | |
728 | if (sensitive_data.nkeys != 0) { | |
729 | for (i = 0; i < sensitive_data.nkeys; i++) { | |
730 | if (sensitive_data.keys[i] != NULL) { | |
731 | /* Destroys contents safely */ | |
732 | debug3("clear hostkey %d", i); | |
733 | key_free(sensitive_data.keys[i]); | |
734 | sensitive_data.keys[i] = NULL; | |
735 | } | |
736 | } | |
737 | xfree(sensitive_data.keys); | |
738 | } | |
739 | ||
740 | exit_status = compat20 ? ssh_session2() : ssh_session(); | |
741 | packet_close(); | |
742 | return exit_status; | |
743 | } | |
744 | ||
745 | static void | |
746 | x11_get_proto(char *proto, int proto_len, char *data, int data_len) | |
747 | { | |
748 | char line[512]; | |
749 | FILE *f; | |
750 | int got_data = 0, i; | |
751 | ||
752 | if (options.xauth_location) { | |
753 | /* Try to get Xauthority information for the display. */ | |
754 | snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL, | |
755 | options.xauth_location, getenv("DISPLAY")); | |
756 | f = popen(line, "r"); | |
757 | if (f && fgets(line, sizeof(line), f) && | |
758 | sscanf(line, "%*s %s %s", proto, data) == 2) | |
759 | got_data = 1; | |
760 | if (f) | |
761 | pclose(f); | |
762 | } | |
763 | /* | |
764 | * If we didn't get authentication data, just make up some | |
765 | * data. The forwarding code will check the validity of the | |
766 | * response anyway, and substitute this data. The X11 | |
767 | * server, however, will ignore this fake data and use | |
768 | * whatever authentication mechanisms it was using otherwise | |
769 | * for the local connection. | |
770 | */ | |
771 | if (!got_data) { | |
772 | u_int32_t rand = 0; | |
773 | ||
774 | strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len); | |
775 | for (i = 0; i < 16; i++) { | |
776 | if (i % 4 == 0) | |
777 | rand = arc4random(); | |
778 | snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff); | |
779 | rand >>= 8; | |
780 | } | |
781 | } | |
782 | } | |
783 | ||
784 | static void | |
785 | ssh_init_forwarding(void) | |
786 | { | |
787 | int success = 0; | |
788 | int i; | |
789 | ||
790 | /* Initiate local TCP/IP port forwardings. */ | |
791 | for (i = 0; i < options.num_local_forwards; i++) { | |
792 | debug("Connections to local port %d forwarded to remote address %.200s:%d", | |
793 | options.local_forwards[i].port, | |
794 | options.local_forwards[i].host, | |
795 | options.local_forwards[i].host_port); | |
796 | success += channel_request_local_forwarding( | |
797 | options.local_forwards[i].port, | |
798 | options.local_forwards[i].host, | |
799 | options.local_forwards[i].host_port, | |
800 | options.gateway_ports); | |
801 | } | |
802 | if (i > 0 && success == 0) | |
803 | error("Could not request local forwarding."); | |
804 | ||
805 | /* Initiate remote TCP/IP port forwardings. */ | |
806 | for (i = 0; i < options.num_remote_forwards; i++) { | |
807 | debug("Connections to remote port %d forwarded to local address %.200s:%d", | |
808 | options.remote_forwards[i].port, | |
809 | options.remote_forwards[i].host, | |
810 | options.remote_forwards[i].host_port); | |
811 | channel_request_remote_forwarding( | |
812 | options.remote_forwards[i].port, | |
813 | options.remote_forwards[i].host, | |
814 | options.remote_forwards[i].host_port); | |
815 | } | |
816 | } | |
817 | ||
818 | static void | |
819 | check_agent_present(void) | |
820 | { | |
821 | if (options.forward_agent) { | |
822 | /* Clear agent forwarding if we don\'t have an agent. */ | |
823 | int authfd = ssh_get_authentication_socket(); | |
824 | if (authfd < 0) | |
825 | options.forward_agent = 0; | |
826 | else | |
827 | ssh_close_authentication_socket(authfd); | |
828 | } | |
829 | } | |
830 | ||
831 | static int | |
832 | ssh_session(void) | |
833 | { | |
834 | int type; | |
835 | int plen; | |
836 | int interactive = 0; | |
837 | int have_tty = 0; | |
838 | struct winsize ws; | |
839 | char *cp; | |
840 | ||
841 | /* Enable compression if requested. */ | |
842 | if (options.compression) { | |
843 | debug("Requesting compression at level %d.", options.compression_level); | |
844 | ||
845 | if (options.compression_level < 1 || options.compression_level > 9) | |
846 | fatal("Compression level must be from 1 (fast) to 9 (slow, best)."); | |
847 | ||
848 | /* Send the request. */ | |
849 | packet_start(SSH_CMSG_REQUEST_COMPRESSION); | |
850 | packet_put_int(options.compression_level); | |
851 | packet_send(); | |
852 | packet_write_wait(); | |
853 | type = packet_read(&plen); | |
854 | if (type == SSH_SMSG_SUCCESS) | |
855 | packet_start_compression(options.compression_level); | |
856 | else if (type == SSH_SMSG_FAILURE) | |
857 | log("Warning: Remote host refused compression."); | |
858 | else | |
859 | packet_disconnect("Protocol error waiting for compression response."); | |
860 | } | |
861 | /* Allocate a pseudo tty if appropriate. */ | |
862 | if (tty_flag) { | |
863 | debug("Requesting pty."); | |
864 | ||
865 | /* Start the packet. */ | |
866 | packet_start(SSH_CMSG_REQUEST_PTY); | |
867 | ||
868 | /* Store TERM in the packet. There is no limit on the | |
869 | length of the string. */ | |
870 | cp = getenv("TERM"); | |
871 | if (!cp) | |
872 | cp = ""; | |
873 | packet_put_cstring(cp); | |
874 | ||
875 | /* Store window size in the packet. */ | |
876 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
877 | memset(&ws, 0, sizeof(ws)); | |
878 | packet_put_int(ws.ws_row); | |
879 | packet_put_int(ws.ws_col); | |
880 | packet_put_int(ws.ws_xpixel); | |
881 | packet_put_int(ws.ws_ypixel); | |
882 | ||
883 | /* Store tty modes in the packet. */ | |
884 | tty_make_modes(fileno(stdin), NULL); | |
885 | ||
886 | /* Send the packet, and wait for it to leave. */ | |
887 | packet_send(); | |
888 | packet_write_wait(); | |
889 | ||
890 | /* Read response from the server. */ | |
891 | type = packet_read(&plen); | |
892 | if (type == SSH_SMSG_SUCCESS) { | |
893 | interactive = 1; | |
894 | have_tty = 1; | |
895 | } else if (type == SSH_SMSG_FAILURE) | |
896 | log("Warning: Remote host failed or refused to allocate a pseudo tty."); | |
897 | else | |
898 | packet_disconnect("Protocol error waiting for pty request response."); | |
899 | } | |
900 | /* Request X11 forwarding if enabled and DISPLAY is set. */ | |
901 | if (options.forward_x11 && getenv("DISPLAY") != NULL) { | |
902 | char proto[512], data[512]; | |
903 | /* Get reasonable local authentication information. */ | |
904 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
905 | /* Request forwarding with authentication spoofing. */ | |
906 | debug("Requesting X11 forwarding with authentication spoofing."); | |
907 | x11_request_forwarding_with_spoofing(0, proto, data); | |
908 | ||
909 | /* Read response from the server. */ | |
910 | type = packet_read(&plen); | |
911 | if (type == SSH_SMSG_SUCCESS) { | |
912 | interactive = 1; | |
913 | } else if (type == SSH_SMSG_FAILURE) { | |
914 | log("Warning: Remote host denied X11 forwarding."); | |
915 | } else { | |
916 | packet_disconnect("Protocol error waiting for X11 forwarding"); | |
917 | } | |
918 | } | |
919 | /* Tell the packet module whether this is an interactive session. */ | |
920 | packet_set_interactive(interactive); | |
921 | ||
922 | /* Request authentication agent forwarding if appropriate. */ | |
923 | check_agent_present(); | |
924 | ||
925 | if (options.forward_agent) { | |
926 | debug("Requesting authentication agent forwarding."); | |
927 | auth_request_forwarding(); | |
928 | ||
929 | /* Read response from the server. */ | |
930 | type = packet_read(&plen); | |
931 | packet_integrity_check(plen, 0, type); | |
932 | if (type != SSH_SMSG_SUCCESS) | |
933 | log("Warning: Remote host denied authentication agent forwarding."); | |
934 | } | |
935 | ||
936 | /* Initiate port forwardings. */ | |
937 | ssh_init_forwarding(); | |
938 | ||
939 | /* If requested, let ssh continue in the background. */ | |
940 | if (fork_after_authentication_flag) | |
941 | if (daemon(1, 1) < 0) | |
942 | fatal("daemon() failed: %.200s", strerror(errno)); | |
943 | ||
944 | /* | |
945 | * If a command was specified on the command line, execute the | |
946 | * command now. Otherwise request the server to start a shell. | |
947 | */ | |
948 | if (buffer_len(&command) > 0) { | |
949 | int len = buffer_len(&command); | |
950 | if (len > 900) | |
951 | len = 900; | |
952 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
953 | packet_start(SSH_CMSG_EXEC_CMD); | |
954 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
955 | packet_send(); | |
956 | packet_write_wait(); | |
957 | } else { | |
958 | debug("Requesting shell."); | |
959 | packet_start(SSH_CMSG_EXEC_SHELL); | |
960 | packet_send(); | |
961 | packet_write_wait(); | |
962 | } | |
963 | ||
964 | /* Enter the interactive session. */ | |
965 | return client_loop(have_tty, tty_flag ? | |
966 | options.escape_char : SSH_ESCAPECHAR_NONE, 0); | |
967 | } | |
968 | ||
969 | static void | |
970 | client_subsystem_reply(int type, int plen, void *ctxt) | |
971 | { | |
972 | int id, len; | |
973 | ||
974 | id = packet_get_int(); | |
975 | len = buffer_len(&command); | |
976 | if (len > 900) | |
977 | len = 900; | |
978 | packet_done(); | |
979 | if (type == SSH2_MSG_CHANNEL_FAILURE) | |
980 | fatal("Request for subsystem '%.*s' failed on channel %d", | |
981 | len, buffer_ptr(&command), id); | |
982 | } | |
983 | ||
984 | static void | |
985 | ssh_session2_callback(int id, void *arg) | |
986 | { | |
987 | int len; | |
988 | int interactive = 0; | |
989 | struct termios tio; | |
990 | ||
991 | debug("client_init id %d arg %ld", id, (long)arg); | |
992 | ||
993 | if (tty_flag) { | |
994 | struct winsize ws; | |
995 | char *cp; | |
996 | cp = getenv("TERM"); | |
997 | if (!cp) | |
998 | cp = ""; | |
999 | /* Store window size in the packet. */ | |
1000 | if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0) | |
1001 | memset(&ws, 0, sizeof(ws)); | |
1002 | ||
1003 | channel_request_start(id, "pty-req", 0); | |
1004 | packet_put_cstring(cp); | |
1005 | packet_put_int(ws.ws_col); | |
1006 | packet_put_int(ws.ws_row); | |
1007 | packet_put_int(ws.ws_xpixel); | |
1008 | packet_put_int(ws.ws_ypixel); | |
1009 | tio = get_saved_tio(); | |
1010 | tty_make_modes(/*ignored*/ 0, &tio); | |
1011 | packet_send(); | |
1012 | interactive = 1; | |
1013 | /* XXX wait for reply */ | |
1014 | } | |
1015 | if (options.forward_x11 && | |
1016 | getenv("DISPLAY") != NULL) { | |
1017 | char proto[512], data[512]; | |
1018 | /* Get reasonable local authentication information. */ | |
1019 | x11_get_proto(proto, sizeof proto, data, sizeof data); | |
1020 | /* Request forwarding with authentication spoofing. */ | |
1021 | debug("Requesting X11 forwarding with authentication spoofing."); | |
1022 | x11_request_forwarding_with_spoofing(id, proto, data); | |
1023 | interactive = 1; | |
1024 | /* XXX wait for reply */ | |
1025 | } | |
1026 | ||
1027 | check_agent_present(); | |
1028 | if (options.forward_agent) { | |
1029 | debug("Requesting authentication agent forwarding."); | |
1030 | channel_request_start(id, "auth-agent-req@openssh.com", 0); | |
1031 | packet_send(); | |
1032 | } | |
1033 | ||
1034 | len = buffer_len(&command); | |
1035 | if (len > 0) { | |
1036 | if (len > 900) | |
1037 | len = 900; | |
1038 | if (subsystem_flag) { | |
1039 | debug("Sending subsystem: %.*s", len, buffer_ptr(&command)); | |
1040 | channel_request_start(id, "subsystem", /*want reply*/ 1); | |
1041 | /* register callback for reply */ | |
1042 | /* XXX we asume that client_loop has already been called */ | |
1043 | dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); | |
1044 | dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); | |
1045 | } else { | |
1046 | debug("Sending command: %.*s", len, buffer_ptr(&command)); | |
1047 | channel_request_start(id, "exec", 0); | |
1048 | } | |
1049 | packet_put_string(buffer_ptr(&command), buffer_len(&command)); | |
1050 | packet_send(); | |
1051 | } else { | |
1052 | channel_request(id, "shell", 0); | |
1053 | } | |
1054 | /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ | |
1055 | ||
1056 | /* register different callback, etc. XXX */ | |
1057 | packet_set_interactive(interactive); | |
1058 | } | |
1059 | ||
1060 | static int | |
1061 | ssh_session2_command(void) | |
1062 | { | |
1063 | Channel *c; | |
1064 | int window, packetmax, in, out, err; | |
1065 | ||
1066 | if (stdin_null_flag) { | |
1067 | in = open(_PATH_DEVNULL, O_RDONLY); | |
1068 | } else { | |
1069 | in = dup(STDIN_FILENO); | |
1070 | } | |
1071 | out = dup(STDOUT_FILENO); | |
1072 | err = dup(STDERR_FILENO); | |
1073 | ||
1074 | if (in < 0 || out < 0 || err < 0) | |
1075 | fatal("dup() in/out/err failed"); | |
1076 | ||
1077 | /* enable nonblocking unless tty */ | |
1078 | if (!isatty(in)) | |
1079 | set_nonblock(in); | |
1080 | if (!isatty(out)) | |
1081 | set_nonblock(out); | |
1082 | if (!isatty(err)) | |
1083 | set_nonblock(err); | |
1084 | ||
1085 | window = CHAN_SES_WINDOW_DEFAULT; | |
1086 | packetmax = CHAN_SES_PACKET_DEFAULT; | |
1087 | if (!tty_flag) { | |
1088 | window *= 2; | |
1089 | packetmax *=2; | |
1090 | } | |
1091 | c = channel_new( | |
1092 | "session", SSH_CHANNEL_OPENING, in, out, err, | |
1093 | window, packetmax, CHAN_EXTENDED_WRITE, | |
1094 | xstrdup("client-session"), /*nonblock*/0); | |
1095 | if (c == NULL) | |
1096 | fatal("ssh_session2_command: channel_new failed"); | |
1097 | ||
1098 | debug3("ssh_session2_command: channel_new: %d", c->self); | |
1099 | ||
1100 | channel_send_open(c->self); | |
1101 | channel_register_callback(c->self, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, | |
1102 | ssh_session2_callback, (void *)0); | |
1103 | ||
1104 | return c->self; | |
1105 | } | |
1106 | ||
1107 | static int | |
1108 | ssh_session2(void) | |
1109 | { | |
1110 | int id; | |
1111 | ||
1112 | /* XXX should be pre-session */ | |
1113 | ssh_init_forwarding(); | |
1114 | ||
1115 | id = no_shell_flag ? -1 : ssh_session2_command(); | |
1116 | ||
1117 | /* If requested, let ssh continue in the background. */ | |
1118 | if (fork_after_authentication_flag) | |
1119 | if (daemon(1, 1) < 0) | |
1120 | fatal("daemon() failed: %.200s", strerror(errno)); | |
1121 | ||
1122 | return client_loop(tty_flag, tty_flag ? | |
1123 | options.escape_char : SSH_ESCAPECHAR_NONE, id); | |
1124 | } | |
1125 | ||
1126 | static void | |
1127 | load_public_identity_files(void) | |
1128 | { | |
1129 | char *filename; | |
1130 | Key *public; | |
1131 | int i; | |
1132 | ||
1133 | for (i = 0; i < options.num_identity_files; i++) { | |
1134 | filename = tilde_expand_filename(options.identity_files[i], | |
1135 | original_real_uid); | |
1136 | public = key_load_public(filename, NULL); | |
1137 | debug("identity file %s type %d", filename, | |
1138 | public ? public->type : -1); | |
1139 | xfree(options.identity_files[i]); | |
1140 | options.identity_files[i] = filename; | |
1141 | options.identity_keys[i] = public; | |
1142 | } | |
1143 | } |