]>
Commit | Line | Data |
---|---|---|
20d0f77f | 1 | /* |
f3c7c613 | 2 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
bcbf86ec | 3 | * |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * 1. Redistributions of source code must retain the above copyright | |
8 | * notice, this list of conditions and the following disclaimer. | |
9 | * 2. Redistributions in binary form must reproduce the above copyright | |
10 | * notice, this list of conditions and the following disclaimer in the | |
11 | * documentation and/or other materials provided with the distribution. | |
12 | * | |
13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
7368a6c8 | 23 | */ |
24 | ||
25 | #include "includes.h" | |
2dcbac07 | 26 | RCSID("$OpenBSD: auth.c,v 1.58 2005/03/14 11:44:42 dtucker Exp $"); |
7368a6c8 | 27 | |
c1ef8333 | 28 | #ifdef HAVE_LOGIN_H |
29 | #include <login.h> | |
30 | #endif | |
f14ca4a4 | 31 | #ifdef USE_SHADOW |
4cb5ffa0 | 32 | #include <shadow.h> |
f14ca4a4 | 33 | #endif |
7368a6c8 | 34 | |
b4d02860 | 35 | #ifdef HAVE_LIBGEN_H |
c8445989 | 36 | #include <libgen.h> |
b4d02860 | 37 | #endif |
c8445989 | 38 | |
42f11eb2 | 39 | #include "xmalloc.h" |
40 | #include "match.h" | |
41 | #include "groupaccess.h" | |
42 | #include "log.h" | |
43 | #include "servconf.h" | |
e78a59f5 | 44 | #include "auth.h" |
59c97189 | 45 | #include "auth-options.h" |
42f11eb2 | 46 | #include "canohost.h" |
c8445989 | 47 | #include "buffer.h" |
48 | #include "bufaux.h" | |
d0c8ca5c | 49 | #include "uidswap.h" |
5f1f36b5 | 50 | #include "misc.h" |
01dafcb5 | 51 | #include "bufaux.h" |
52 | #include "packet.h" | |
575e336f | 53 | #include "loginrec.h" |
c00e4d75 | 54 | #include "monitor_wrap.h" |
e78a59f5 | 55 | |
7368a6c8 | 56 | /* import */ |
57 | extern ServerOptions options; | |
bc7dfc06 | 58 | extern Buffer loginmsg; |
7368a6c8 | 59 | |
01dafcb5 | 60 | /* Debugging messages */ |
61 | Buffer auth_debug; | |
62 | int auth_debug_init; | |
63 | ||
7368a6c8 | 64 | /* |
c6a69271 | 65 | * Check if the user is allowed to log in via ssh. If user is listed |
66 | * in DenyUsers or one of user's groups is listed in DenyGroups, false | |
67 | * will be returned. If AllowUsers isn't empty and user isn't listed | |
68 | * there, or if AllowGroups isn't empty and one of user's groups isn't | |
69 | * listed there, false will be returned. | |
7368a6c8 | 70 | * If the user's shell is not executable, false will be returned. |
6ae2364d | 71 | * Otherwise true is returned. |
7368a6c8 | 72 | */ |
a306f2dd | 73 | int |
7368a6c8 | 74 | allowed_user(struct passwd * pw) |
75 | { | |
76 | struct stat st; | |
da67ae18 | 77 | const char *hostname = NULL, *ipaddr = NULL, *passwd = NULL; |
614dee3a | 78 | char *shell; |
7368a6c8 | 79 | int i; |
f14ca4a4 | 80 | #ifdef USE_SHADOW |
3e6e3da0 | 81 | struct spwd *spw = NULL; |
e2ef2342 | 82 | #endif |
7368a6c8 | 83 | |
84 | /* Shouldn't be called if pw is NULL, but better safe than sorry... */ | |
c6a69271 | 85 | if (!pw || !pw->pw_name) |
7368a6c8 | 86 | return 0; |
87 | ||
f14ca4a4 | 88 | #ifdef USE_SHADOW |
3e6e3da0 | 89 | if (!options.use_pam) |
90 | spw = getspnam(pw->pw_name); | |
91 | #ifdef HAS_SHADOW_EXPIRE | |
f14ca4a4 | 92 | if (!options.use_pam && spw != NULL && auth_shadow_acctexpired(spw)) |
93 | return 0; | |
3e6e3da0 | 94 | #endif /* HAS_SHADOW_EXPIRE */ |
f14ca4a4 | 95 | #endif /* USE_SHADOW */ |
3e6e3da0 | 96 | |
aff51935 | 97 | /* grab passwd field for locked account check */ |
f14ca4a4 | 98 | #ifdef USE_SHADOW |
3e6e3da0 | 99 | if (spw != NULL) |
100 | passwd = spw->sp_pwdp; | |
101 | #else | |
102 | passwd = pw->pw_passwd; | |
b57c8e20 | 103 | #endif |
104 | ||
aff51935 | 105 | /* check for locked account */ |
da67ae18 | 106 | if (!options.use_pam && passwd && *passwd) { |
3e6e3da0 | 107 | int locked = 0; |
108 | ||
109 | #ifdef LOCKED_PASSWD_STRING | |
110 | if (strcmp(passwd, LOCKED_PASSWD_STRING) == 0) | |
111 | locked = 1; | |
112 | #endif | |
113 | #ifdef LOCKED_PASSWD_PREFIX | |
114 | if (strncmp(passwd, LOCKED_PASSWD_PREFIX, | |
115 | strlen(LOCKED_PASSWD_PREFIX)) == 0) | |
116 | locked = 1; | |
117 | #endif | |
118 | #ifdef LOCKED_PASSWD_SUBSTR | |
119 | if (strstr(passwd, LOCKED_PASSWD_SUBSTR)) | |
120 | locked = 1; | |
121 | #endif | |
122 | if (locked) { | |
123 | logit("User %.100s not allowed because account is locked", | |
124 | pw->pw_name); | |
125 | return 0; | |
126 | } | |
127 | } | |
128 | ||
301e9b01 | 129 | /* |
130 | * Get the shell from the password data. An empty shell field is | |
131 | * legal, and means /bin/sh. | |
132 | */ | |
133 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
134 | ||
135 | /* deny if shell does not exists or is not executable */ | |
b334badd | 136 | if (stat(shell, &st) != 0) { |
bbe88b6d | 137 | logit("User %.100s not allowed because shell %.100s does not exist", |
b334badd | 138 | pw->pw_name, shell); |
7368a6c8 | 139 | return 0; |
b334badd | 140 | } |
c390a3c8 | 141 | if (S_ISREG(st.st_mode) == 0 || |
142 | (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)) == 0) { | |
bbe88b6d | 143 | logit("User %.100s not allowed because shell %.100s is not executable", |
b334badd | 144 | pw->pw_name, shell); |
7368a6c8 | 145 | return 0; |
b334badd | 146 | } |
7368a6c8 | 147 | |
2dcbac07 | 148 | if (options.num_deny_users > 0 || options.num_allow_users > 0 || |
149 | options.num_deny_groups > 0 || options.num_allow_groups > 0) { | |
c5a7d788 | 150 | hostname = get_canonical_hostname(options.use_dns); |
6805fc56 | 151 | ipaddr = get_remote_ipaddr(); |
152 | } | |
153 | ||
7368a6c8 | 154 | /* Return false if user is listed in DenyUsers */ |
155 | if (options.num_deny_users > 0) { | |
7368a6c8 | 156 | for (i = 0; i < options.num_deny_users; i++) |
762715ce | 157 | if (match_user(pw->pw_name, hostname, ipaddr, |
b334badd | 158 | options.deny_users[i])) { |
31de8b2b | 159 | logit("User %.100s from %.100s not allowed " |
160 | "because listed in DenyUsers", | |
161 | pw->pw_name, hostname); | |
7368a6c8 | 162 | return 0; |
b334badd | 163 | } |
7368a6c8 | 164 | } |
165 | /* Return false if AllowUsers isn't empty and user isn't listed there */ | |
166 | if (options.num_allow_users > 0) { | |
7368a6c8 | 167 | for (i = 0; i < options.num_allow_users; i++) |
762715ce | 168 | if (match_user(pw->pw_name, hostname, ipaddr, |
80f8f24f | 169 | options.allow_users[i])) |
7368a6c8 | 170 | break; |
171 | /* i < options.num_allow_users iff we break for loop */ | |
b334badd | 172 | if (i >= options.num_allow_users) { |
31de8b2b | 173 | logit("User %.100s from %.100s not allowed because " |
174 | "not listed in AllowUsers", pw->pw_name, hostname); | |
7368a6c8 | 175 | return 0; |
b334badd | 176 | } |
7368a6c8 | 177 | } |
7368a6c8 | 178 | if (options.num_deny_groups > 0 || options.num_allow_groups > 0) { |
c6a69271 | 179 | /* Get the user's group access list (primary and supplementary) */ |
b334badd | 180 | if (ga_init(pw->pw_name, pw->pw_gid) == 0) { |
31de8b2b | 181 | logit("User %.100s from %.100s not allowed because " |
182 | "not in any group", pw->pw_name, hostname); | |
7368a6c8 | 183 | return 0; |
b334badd | 184 | } |
7368a6c8 | 185 | |
c6a69271 | 186 | /* Return false if one of user's groups is listed in DenyGroups */ |
187 | if (options.num_deny_groups > 0) | |
188 | if (ga_match(options.deny_groups, | |
189 | options.num_deny_groups)) { | |
190 | ga_free(); | |
31de8b2b | 191 | logit("User %.100s from %.100s not allowed " |
192 | "because a group is listed in DenyGroups", | |
193 | pw->pw_name, hostname); | |
7368a6c8 | 194 | return 0; |
c6a69271 | 195 | } |
7368a6c8 | 196 | /* |
c6a69271 | 197 | * Return false if AllowGroups isn't empty and one of user's groups |
7368a6c8 | 198 | * isn't listed there |
199 | */ | |
c6a69271 | 200 | if (options.num_allow_groups > 0) |
201 | if (!ga_match(options.allow_groups, | |
202 | options.num_allow_groups)) { | |
203 | ga_free(); | |
31de8b2b | 204 | logit("User %.100s from %.100s not allowed " |
205 | "because none of user's groups are listed " | |
206 | "in AllowGroups", pw->pw_name, hostname); | |
7368a6c8 | 207 | return 0; |
c6a69271 | 208 | } |
209 | ga_free(); | |
7368a6c8 | 210 | } |
211 | ||
bc5c2025 | 212 | #ifdef CUSTOM_SYS_AUTH_ALLOWED_USER |
5ccf88cb | 213 | if (!sys_auth_allowed_user(pw, &loginmsg)) |
bc5c2025 | 214 | return 0; |
215 | #endif | |
7368a6c8 | 216 | |
217 | /* We found no reason not to let this user try to log on... */ | |
218 | return 1; | |
219 | } | |
59c97189 | 220 | |
59c97189 | 221 | void |
222 | auth_log(Authctxt *authctxt, int authenticated, char *method, char *info) | |
223 | { | |
224 | void (*authlog) (const char *fmt,...) = verbose; | |
225 | char *authmsg; | |
226 | ||
227 | /* Raise logging level */ | |
228 | if (authenticated == 1 || | |
229 | !authctxt->valid || | |
af4bd935 | 230 | authctxt->failures >= options.max_authtries / 2 || |
59c97189 | 231 | strcmp(method, "password") == 0) |
a3568201 | 232 | authlog = logit; |
59c97189 | 233 | |
234 | if (authctxt->postponed) | |
235 | authmsg = "Postponed"; | |
236 | else | |
237 | authmsg = authenticated ? "Accepted" : "Failed"; | |
238 | ||
239 | authlog("%s %s for %s%.100s from %.200s port %d%s", | |
240 | authmsg, | |
241 | method, | |
d77347cc | 242 | authctxt->valid ? "" : "invalid user ", |
fad3754c | 243 | authctxt->user, |
59c97189 | 244 | get_remote_ipaddr(), |
245 | get_remote_port(), | |
246 | info); | |
56fd97d7 | 247 | |
73d9dad3 | 248 | #ifdef CUSTOM_FAILED_LOGIN |
b6610e8f | 249 | if (authenticated == 0 && !authctxt->postponed && |
250 | (strcmp(method, "password") == 0 || | |
6af6e631 | 251 | strncmp(method, "keyboard-interactive", 20) == 0 || |
252 | strcmp(method, "challenge-response") == 0)) | |
575e336f | 253 | record_failed_login(authctxt->user, |
254 | get_canonical_hostname(options.use_dns), "ssh"); | |
73d9dad3 | 255 | #endif |
6039eeef | 256 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 257 | if (authenticated == 0 && !authctxt->postponed) { |
258 | ssh_audit_event_t event; | |
259 | ||
260 | debug3("audit failed auth attempt, method %s euid %d", | |
261 | method, (int)geteuid()); | |
262 | /* | |
263 | * Because the auth loop is used in both monitor and slave, | |
264 | * we must be careful to send each event only once and with | |
265 | * enough privs to write the event. | |
266 | */ | |
267 | event = audit_classify_auth(method); | |
268 | switch(event) { | |
6039eeef | 269 | case SSH_AUTH_FAIL_NONE: |
270 | case SSH_AUTH_FAIL_PASSWD: | |
271 | case SSH_AUTH_FAIL_KBDINT: | |
c00e4d75 | 272 | if (geteuid() == 0) |
273 | audit_event(event); | |
274 | break; | |
6039eeef | 275 | case SSH_AUTH_FAIL_PUBKEY: |
276 | case SSH_AUTH_FAIL_HOSTBASED: | |
277 | case SSH_AUTH_FAIL_GSSAPI: | |
c00e4d75 | 278 | /* |
279 | * This is required to handle the case where privsep | |
280 | * is enabled but it's root logging in, since | |
281 | * use_privsep won't be cleared until after a | |
282 | * successful login. | |
283 | */ | |
284 | if (geteuid() == 0) | |
285 | audit_event(event); | |
286 | else | |
287 | PRIVSEP(audit_event(event)); | |
288 | break; | |
289 | default: | |
290 | error("unknown authentication audit event %d", event); | |
291 | } | |
292 | } | |
293 | #endif | |
59c97189 | 294 | } |
295 | ||
296 | /* | |
15853e93 | 297 | * Check whether root logins are disallowed. |
59c97189 | 298 | */ |
299 | int | |
15853e93 | 300 | auth_root_allowed(char *method) |
59c97189 | 301 | { |
15853e93 | 302 | switch (options.permit_root_login) { |
303 | case PERMIT_YES: | |
59c97189 | 304 | return 1; |
15853e93 | 305 | break; |
306 | case PERMIT_NO_PASSWD: | |
307 | if (strcmp(method, "password") != 0) | |
308 | return 1; | |
309 | break; | |
310 | case PERMIT_FORCED_ONLY: | |
311 | if (forced_command) { | |
bbe88b6d | 312 | logit("Root login accepted for forced command."); |
15853e93 | 313 | return 1; |
314 | } | |
315 | break; | |
59c97189 | 316 | } |
bbe88b6d | 317 | logit("ROOT LOGIN REFUSED FROM %.200s", get_remote_ipaddr()); |
15853e93 | 318 | return 0; |
59c97189 | 319 | } |
c8445989 | 320 | |
321 | ||
322 | /* | |
323 | * Given a template and a passwd structure, build a filename | |
324 | * by substituting % tokenised options. Currently, %% becomes '%', | |
325 | * %h becomes the home directory and %u the username. | |
326 | * | |
327 | * This returns a buffer allocated by xmalloc. | |
328 | */ | |
329 | char * | |
330 | expand_filename(const char *filename, struct passwd *pw) | |
331 | { | |
332 | Buffer buffer; | |
333 | char *file; | |
334 | const char *cp; | |
335 | ||
336 | /* | |
337 | * Build the filename string in the buffer by making the appropriate | |
338 | * substitutions to the given file name. | |
339 | */ | |
340 | buffer_init(&buffer); | |
341 | for (cp = filename; *cp; cp++) { | |
342 | if (cp[0] == '%' && cp[1] == '%') { | |
343 | buffer_append(&buffer, "%", 1); | |
344 | cp++; | |
345 | continue; | |
346 | } | |
347 | if (cp[0] == '%' && cp[1] == 'h') { | |
348 | buffer_append(&buffer, pw->pw_dir, strlen(pw->pw_dir)); | |
349 | cp++; | |
350 | continue; | |
351 | } | |
352 | if (cp[0] == '%' && cp[1] == 'u') { | |
353 | buffer_append(&buffer, pw->pw_name, | |
184eed6a | 354 | strlen(pw->pw_name)); |
c8445989 | 355 | cp++; |
356 | continue; | |
357 | } | |
358 | buffer_append(&buffer, cp, 1); | |
359 | } | |
360 | buffer_append(&buffer, "\0", 1); | |
361 | ||
362 | /* | |
363 | * Ensure that filename starts anchored. If not, be backward | |
364 | * compatible and prepend the '%h/' | |
365 | */ | |
366 | file = xmalloc(MAXPATHLEN); | |
367 | cp = buffer_ptr(&buffer); | |
368 | if (*cp != '/') | |
369 | snprintf(file, MAXPATHLEN, "%s/%s", pw->pw_dir, cp); | |
370 | else | |
371 | strlcpy(file, cp, MAXPATHLEN); | |
372 | ||
373 | buffer_free(&buffer); | |
374 | return file; | |
375 | } | |
376 | ||
377 | char * | |
378 | authorized_keys_file(struct passwd *pw) | |
379 | { | |
380 | return expand_filename(options.authorized_keys_file, pw); | |
381 | } | |
382 | ||
383 | char * | |
384 | authorized_keys_file2(struct passwd *pw) | |
385 | { | |
386 | return expand_filename(options.authorized_keys_file2, pw); | |
387 | } | |
388 | ||
d0c8ca5c | 389 | /* return ok if key exists in sysfile or userfile */ |
390 | HostStatus | |
391 | check_key_in_hostfiles(struct passwd *pw, Key *key, const char *host, | |
392 | const char *sysfile, const char *userfile) | |
393 | { | |
394 | Key *found; | |
395 | char *user_hostfile; | |
396 | struct stat st; | |
17a3011c | 397 | HostStatus host_status; |
d0c8ca5c | 398 | |
399 | /* Check if we know the host and its host key. */ | |
400 | found = key_new(key->type); | |
401 | host_status = check_host_in_hostfile(sysfile, host, key, found, NULL); | |
402 | ||
403 | if (host_status != HOST_OK && userfile != NULL) { | |
404 | user_hostfile = tilde_expand_filename(userfile, pw->pw_uid); | |
405 | if (options.strict_modes && | |
406 | (stat(user_hostfile, &st) == 0) && | |
407 | ((st.st_uid != 0 && st.st_uid != pw->pw_uid) || | |
184eed6a | 408 | (st.st_mode & 022) != 0)) { |
bbe88b6d | 409 | logit("Authentication refused for %.100s: " |
d0c8ca5c | 410 | "bad owner or modes for %.200s", |
411 | pw->pw_name, user_hostfile); | |
412 | } else { | |
413 | temporarily_use_uid(pw); | |
414 | host_status = check_host_in_hostfile(user_hostfile, | |
415 | host, key, found, NULL); | |
416 | restore_uid(); | |
417 | } | |
418 | xfree(user_hostfile); | |
419 | } | |
420 | key_free(found); | |
421 | ||
422 | debug2("check_key_in_hostfiles: key %s for %s", host_status == HOST_OK ? | |
423 | "ok" : "not found", host); | |
424 | return host_status; | |
425 | } | |
426 | ||
427 | ||
c8445989 | 428 | /* |
429 | * Check a given file for security. This is defined as all components | |
d6097023 | 430 | * of the path to the file must be owned by either the owner of |
1ddf764b | 431 | * of the file or root and no directories must be group or world writable. |
c8445989 | 432 | * |
433 | * XXX Should any specific check be done for sym links ? | |
434 | * | |
435 | * Takes an open file descriptor, the file name, a uid and and | |
436 | * error buffer plus max size as arguments. | |
437 | * | |
438 | * Returns 0 on success and -1 on failure | |
439 | */ | |
440 | int | |
6978866a | 441 | secure_filename(FILE *f, const char *file, struct passwd *pw, |
442 | char *err, size_t errlen) | |
c8445989 | 443 | { |
6978866a | 444 | uid_t uid = pw->pw_uid; |
76fbdd47 | 445 | char buf[MAXPATHLEN], homedir[MAXPATHLEN]; |
c8445989 | 446 | char *cp; |
f6f02456 | 447 | int comparehome = 0; |
c8445989 | 448 | struct stat st; |
449 | ||
450 | if (realpath(file, buf) == NULL) { | |
451 | snprintf(err, errlen, "realpath %s failed: %s", file, | |
452 | strerror(errno)); | |
453 | return -1; | |
454 | } | |
f6f02456 | 455 | if (realpath(pw->pw_dir, homedir) != NULL) |
456 | comparehome = 1; | |
c8445989 | 457 | |
458 | /* check the open file to avoid races */ | |
459 | if (fstat(fileno(f), &st) < 0 || | |
460 | (st.st_uid != 0 && st.st_uid != uid) || | |
461 | (st.st_mode & 022) != 0) { | |
462 | snprintf(err, errlen, "bad ownership or modes for file %s", | |
463 | buf); | |
464 | return -1; | |
465 | } | |
466 | ||
467 | /* for each component of the canonical path, walking upwards */ | |
468 | for (;;) { | |
469 | if ((cp = dirname(buf)) == NULL) { | |
470 | snprintf(err, errlen, "dirname() failed"); | |
471 | return -1; | |
472 | } | |
473 | strlcpy(buf, cp, sizeof(buf)); | |
474 | ||
475 | debug3("secure_filename: checking '%s'", buf); | |
476 | if (stat(buf, &st) < 0 || | |
477 | (st.st_uid != 0 && st.st_uid != uid) || | |
478 | (st.st_mode & 022) != 0) { | |
184eed6a | 479 | snprintf(err, errlen, |
c8445989 | 480 | "bad ownership or modes for directory %s", buf); |
481 | return -1; | |
482 | } | |
483 | ||
afd501f9 | 484 | /* If are passed the homedir then we can stop */ |
f6f02456 | 485 | if (comparehome && strcmp(homedir, buf) == 0) { |
afd501f9 | 486 | debug3("secure_filename: terminating check at '%s'", |
487 | buf); | |
488 | break; | |
489 | } | |
c8445989 | 490 | /* |
491 | * dirname should always complete with a "/" path, | |
492 | * but we can be paranoid and check for "." too | |
493 | */ | |
494 | if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) | |
495 | break; | |
496 | } | |
497 | return 0; | |
498 | } | |
443fa1cd | 499 | |
500 | struct passwd * | |
501 | getpwnamallow(const char *user) | |
502 | { | |
1836f69f | 503 | #ifdef HAVE_LOGIN_CAP |
504 | extern login_cap_t *lc; | |
505 | #ifdef BSD_AUTH | |
506 | auth_session_t *as; | |
507 | #endif | |
508 | #endif | |
443fa1cd | 509 | struct passwd *pw; |
510 | ||
511 | pw = getpwnam(user); | |
c2802d92 | 512 | if (pw == NULL) { |
227a6a97 | 513 | logit("Invalid user %.100s from %.100s", |
c2802d92 | 514 | user, get_remote_ipaddr()); |
73d9dad3 | 515 | #ifdef CUSTOM_FAILED_LOGIN |
575e336f | 516 | record_failed_login(user, |
517 | get_canonical_hostname(options.use_dns), "ssh"); | |
819d3f09 | 518 | #endif |
6039eeef | 519 | #ifdef SSH_AUDIT_EVENTS |
520 | audit_event(SSH_INVALID_USER); | |
521 | #endif /* SSH_AUDIT_EVENTS */ | |
c2802d92 | 522 | return (NULL); |
523 | } | |
524 | if (!allowed_user(pw)) | |
1836f69f | 525 | return (NULL); |
526 | #ifdef HAVE_LOGIN_CAP | |
527 | if ((lc = login_getclass(pw->pw_class)) == NULL) { | |
528 | debug("unable to get login class: %s", user); | |
529 | return (NULL); | |
530 | } | |
531 | #ifdef BSD_AUTH | |
532 | if ((as = auth_open()) == NULL || auth_setpwd(as, pw) != 0 || | |
65721f9c | 533 | auth_approval(as, lc, pw->pw_name, "ssh") <= 0) { |
1836f69f | 534 | debug("Approval failure for %s", user); |
443fa1cd | 535 | pw = NULL; |
1836f69f | 536 | } |
537 | if (as != NULL) | |
538 | auth_close(as); | |
539 | #endif | |
540 | #endif | |
06bea668 | 541 | if (pw != NULL) |
542 | return (pwcopy(pw)); | |
543 | return (NULL); | |
443fa1cd | 544 | } |
01dafcb5 | 545 | |
546 | void | |
547 | auth_debug_add(const char *fmt,...) | |
548 | { | |
549 | char buf[1024]; | |
550 | va_list args; | |
551 | ||
552 | if (!auth_debug_init) | |
553 | return; | |
554 | ||
555 | va_start(args, fmt); | |
556 | vsnprintf(buf, sizeof(buf), fmt, args); | |
557 | va_end(args); | |
558 | buffer_put_cstring(&auth_debug, buf); | |
559 | } | |
560 | ||
561 | void | |
562 | auth_debug_send(void) | |
563 | { | |
564 | char *msg; | |
565 | ||
566 | if (!auth_debug_init) | |
567 | return; | |
568 | while (buffer_len(&auth_debug)) { | |
569 | msg = buffer_get_string(&auth_debug, NULL); | |
570 | packet_send_debug("%s", msg); | |
571 | xfree(msg); | |
572 | } | |
573 | } | |
574 | ||
575 | void | |
576 | auth_debug_reset(void) | |
577 | { | |
578 | if (auth_debug_init) | |
579 | buffer_clear(&auth_debug); | |
580 | else { | |
581 | buffer_init(&auth_debug); | |
582 | auth_debug_init = 1; | |
583 | } | |
584 | } | |
96d0bf74 | 585 | |
586 | struct passwd * | |
587 | fakepw(void) | |
588 | { | |
589 | static struct passwd fake; | |
590 | ||
591 | memset(&fake, 0, sizeof(fake)); | |
592 | fake.pw_name = "NOUSER"; | |
593 | fake.pw_passwd = | |
b6453d99 | 594 | "$2a$06$r3.juUaHZDlIbQaO2dS9FuYxL1W9M81R1Tc92PoSNmzvpEqLkLGrK"; |
96d0bf74 | 595 | fake.pw_gecos = "NOUSER"; |
f6be21a0 | 596 | fake.pw_uid = (uid_t)-1; |
597 | fake.pw_gid = (gid_t)-1; | |
96d0bf74 | 598 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
599 | fake.pw_class = ""; | |
600 | #endif | |
601 | fake.pw_dir = "/nonexist"; | |
602 | fake.pw_shell = "/nonexist"; | |
603 | ||
604 | return (&fake); | |
605 | } |