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31652869 | 1 | /* $OpenBSD: auth.c,v 1.75 2006/08/03 03:34:41 deraadt Exp $ */ |
20d0f77f | 2 | /* |
f3c7c613 | 3 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
bcbf86ec | 4 | * |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * | |
14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
17 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
7368a6c8 | 24 | */ |
25 | ||
26 | #include "includes.h" | |
4095f623 | 27 | |
28 | #include <sys/types.h> | |
29 | #include <sys/stat.h> | |
536c14e8 | 30 | #include <sys/param.h> |
7368a6c8 | 31 | |
8ad2db2a | 32 | #include <netinet/in.h> |
33 | ||
028094f4 | 34 | #include <errno.h> |
a75f5360 | 35 | #ifdef HAVE_PATHS_H |
6f61e0ec | 36 | # include <paths.h> |
a75f5360 | 37 | #endif |
b1842393 | 38 | #include <pwd.h> |
c1ef8333 | 39 | #ifdef HAVE_LOGIN_H |
40 | #include <login.h> | |
41 | #endif | |
f14ca4a4 | 42 | #ifdef USE_SHADOW |
4cb5ffa0 | 43 | #include <shadow.h> |
f14ca4a4 | 44 | #endif |
b4d02860 | 45 | #ifdef HAVE_LIBGEN_H |
c8445989 | 46 | #include <libgen.h> |
b4d02860 | 47 | #endif |
4c72fcfd | 48 | #include <stdarg.h> |
cf851879 | 49 | #include <stdio.h> |
00146caa | 50 | #include <string.h> |
c8445989 | 51 | |
42f11eb2 | 52 | #include "xmalloc.h" |
53 | #include "match.h" | |
54 | #include "groupaccess.h" | |
55 | #include "log.h" | |
31652869 | 56 | #include "buffer.h" |
42f11eb2 | 57 | #include "servconf.h" |
31652869 | 58 | #include "key.h" |
59 | #include "hostfile.h" | |
e78a59f5 | 60 | #include "auth.h" |
59c97189 | 61 | #include "auth-options.h" |
42f11eb2 | 62 | #include "canohost.h" |
d0c8ca5c | 63 | #include "uidswap.h" |
5f1f36b5 | 64 | #include "misc.h" |
01dafcb5 | 65 | #include "packet.h" |
575e336f | 66 | #include "loginrec.h" |
31652869 | 67 | #ifdef GSSAPI |
68 | #include "ssh-gss.h" | |
69 | #endif | |
c00e4d75 | 70 | #include "monitor_wrap.h" |
e78a59f5 | 71 | |
7368a6c8 | 72 | /* import */ |
73 | extern ServerOptions options; | |
c023a130 | 74 | extern int use_privsep; |
bc7dfc06 | 75 | extern Buffer loginmsg; |
7368a6c8 | 76 | |
01dafcb5 | 77 | /* Debugging messages */ |
78 | Buffer auth_debug; | |
79 | int auth_debug_init; | |
80 | ||
7368a6c8 | 81 | /* |
c6a69271 | 82 | * Check if the user is allowed to log in via ssh. If user is listed |
83 | * in DenyUsers or one of user's groups is listed in DenyGroups, false | |
84 | * will be returned. If AllowUsers isn't empty and user isn't listed | |
85 | * there, or if AllowGroups isn't empty and one of user's groups isn't | |
86 | * listed there, false will be returned. | |
7368a6c8 | 87 | * If the user's shell is not executable, false will be returned. |
6ae2364d | 88 | * Otherwise true is returned. |
7368a6c8 | 89 | */ |
a306f2dd | 90 | int |
7368a6c8 | 91 | allowed_user(struct passwd * pw) |
92 | { | |
93 | struct stat st; | |
da67ae18 | 94 | const char *hostname = NULL, *ipaddr = NULL, *passwd = NULL; |
614dee3a | 95 | char *shell; |
2ceb8101 | 96 | u_int i; |
f14ca4a4 | 97 | #ifdef USE_SHADOW |
3e6e3da0 | 98 | struct spwd *spw = NULL; |
e2ef2342 | 99 | #endif |
7368a6c8 | 100 | |
101 | /* Shouldn't be called if pw is NULL, but better safe than sorry... */ | |
c6a69271 | 102 | if (!pw || !pw->pw_name) |
7368a6c8 | 103 | return 0; |
104 | ||
f14ca4a4 | 105 | #ifdef USE_SHADOW |
3e6e3da0 | 106 | if (!options.use_pam) |
107 | spw = getspnam(pw->pw_name); | |
108 | #ifdef HAS_SHADOW_EXPIRE | |
f14ca4a4 | 109 | if (!options.use_pam && spw != NULL && auth_shadow_acctexpired(spw)) |
110 | return 0; | |
3e6e3da0 | 111 | #endif /* HAS_SHADOW_EXPIRE */ |
f14ca4a4 | 112 | #endif /* USE_SHADOW */ |
3e6e3da0 | 113 | |
aff51935 | 114 | /* grab passwd field for locked account check */ |
f14ca4a4 | 115 | #ifdef USE_SHADOW |
3e6e3da0 | 116 | if (spw != NULL) |
26d07095 | 117 | #if defined(HAVE_LIBIAF) && !defined(BROKEN_LIBIAF) |
4c653d8e | 118 | passwd = get_iaf_password(pw); |
119 | #else | |
3e6e3da0 | 120 | passwd = spw->sp_pwdp; |
26d07095 | 121 | #endif /* HAVE_LIBIAF && !BROKEN_LIBIAF */ |
3e6e3da0 | 122 | #else |
123 | passwd = pw->pw_passwd; | |
b57c8e20 | 124 | #endif |
125 | ||
aff51935 | 126 | /* check for locked account */ |
da67ae18 | 127 | if (!options.use_pam && passwd && *passwd) { |
3e6e3da0 | 128 | int locked = 0; |
129 | ||
130 | #ifdef LOCKED_PASSWD_STRING | |
131 | if (strcmp(passwd, LOCKED_PASSWD_STRING) == 0) | |
132 | locked = 1; | |
133 | #endif | |
134 | #ifdef LOCKED_PASSWD_PREFIX | |
135 | if (strncmp(passwd, LOCKED_PASSWD_PREFIX, | |
136 | strlen(LOCKED_PASSWD_PREFIX)) == 0) | |
137 | locked = 1; | |
138 | #endif | |
139 | #ifdef LOCKED_PASSWD_SUBSTR | |
140 | if (strstr(passwd, LOCKED_PASSWD_SUBSTR)) | |
141 | locked = 1; | |
142 | #endif | |
26d07095 | 143 | #if defined(HAVE_LIBIAF) && !defined(BROKEN_LIBIAF) |
144 | free(passwd); | |
145 | #endif /* HAVE_LIBIAF && !BROKEN_LIBIAF */ | |
3e6e3da0 | 146 | if (locked) { |
147 | logit("User %.100s not allowed because account is locked", | |
148 | pw->pw_name); | |
149 | return 0; | |
150 | } | |
151 | } | |
152 | ||
301e9b01 | 153 | /* |
154 | * Get the shell from the password data. An empty shell field is | |
155 | * legal, and means /bin/sh. | |
156 | */ | |
157 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
158 | ||
159 | /* deny if shell does not exists or is not executable */ | |
b334badd | 160 | if (stat(shell, &st) != 0) { |
bbe88b6d | 161 | logit("User %.100s not allowed because shell %.100s does not exist", |
b334badd | 162 | pw->pw_name, shell); |
7368a6c8 | 163 | return 0; |
b334badd | 164 | } |
c390a3c8 | 165 | if (S_ISREG(st.st_mode) == 0 || |
166 | (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)) == 0) { | |
bbe88b6d | 167 | logit("User %.100s not allowed because shell %.100s is not executable", |
b334badd | 168 | pw->pw_name, shell); |
7368a6c8 | 169 | return 0; |
b334badd | 170 | } |
7368a6c8 | 171 | |
2dcbac07 | 172 | if (options.num_deny_users > 0 || options.num_allow_users > 0 || |
173 | options.num_deny_groups > 0 || options.num_allow_groups > 0) { | |
c5a7d788 | 174 | hostname = get_canonical_hostname(options.use_dns); |
6805fc56 | 175 | ipaddr = get_remote_ipaddr(); |
176 | } | |
177 | ||
7368a6c8 | 178 | /* Return false if user is listed in DenyUsers */ |
179 | if (options.num_deny_users > 0) { | |
7368a6c8 | 180 | for (i = 0; i < options.num_deny_users; i++) |
762715ce | 181 | if (match_user(pw->pw_name, hostname, ipaddr, |
b334badd | 182 | options.deny_users[i])) { |
31de8b2b | 183 | logit("User %.100s from %.100s not allowed " |
184 | "because listed in DenyUsers", | |
185 | pw->pw_name, hostname); | |
7368a6c8 | 186 | return 0; |
b334badd | 187 | } |
7368a6c8 | 188 | } |
189 | /* Return false if AllowUsers isn't empty and user isn't listed there */ | |
190 | if (options.num_allow_users > 0) { | |
7368a6c8 | 191 | for (i = 0; i < options.num_allow_users; i++) |
762715ce | 192 | if (match_user(pw->pw_name, hostname, ipaddr, |
80f8f24f | 193 | options.allow_users[i])) |
7368a6c8 | 194 | break; |
195 | /* i < options.num_allow_users iff we break for loop */ | |
b334badd | 196 | if (i >= options.num_allow_users) { |
31de8b2b | 197 | logit("User %.100s from %.100s not allowed because " |
198 | "not listed in AllowUsers", pw->pw_name, hostname); | |
7368a6c8 | 199 | return 0; |
b334badd | 200 | } |
7368a6c8 | 201 | } |
7368a6c8 | 202 | if (options.num_deny_groups > 0 || options.num_allow_groups > 0) { |
c6a69271 | 203 | /* Get the user's group access list (primary and supplementary) */ |
b334badd | 204 | if (ga_init(pw->pw_name, pw->pw_gid) == 0) { |
31de8b2b | 205 | logit("User %.100s from %.100s not allowed because " |
206 | "not in any group", pw->pw_name, hostname); | |
7368a6c8 | 207 | return 0; |
b334badd | 208 | } |
7368a6c8 | 209 | |
c6a69271 | 210 | /* Return false if one of user's groups is listed in DenyGroups */ |
211 | if (options.num_deny_groups > 0) | |
212 | if (ga_match(options.deny_groups, | |
213 | options.num_deny_groups)) { | |
214 | ga_free(); | |
31de8b2b | 215 | logit("User %.100s from %.100s not allowed " |
216 | "because a group is listed in DenyGroups", | |
217 | pw->pw_name, hostname); | |
7368a6c8 | 218 | return 0; |
c6a69271 | 219 | } |
7368a6c8 | 220 | /* |
c6a69271 | 221 | * Return false if AllowGroups isn't empty and one of user's groups |
7368a6c8 | 222 | * isn't listed there |
223 | */ | |
c6a69271 | 224 | if (options.num_allow_groups > 0) |
225 | if (!ga_match(options.allow_groups, | |
226 | options.num_allow_groups)) { | |
227 | ga_free(); | |
31de8b2b | 228 | logit("User %.100s from %.100s not allowed " |
229 | "because none of user's groups are listed " | |
230 | "in AllowGroups", pw->pw_name, hostname); | |
7368a6c8 | 231 | return 0; |
c6a69271 | 232 | } |
233 | ga_free(); | |
7368a6c8 | 234 | } |
235 | ||
bc5c2025 | 236 | #ifdef CUSTOM_SYS_AUTH_ALLOWED_USER |
5ccf88cb | 237 | if (!sys_auth_allowed_user(pw, &loginmsg)) |
bc5c2025 | 238 | return 0; |
239 | #endif | |
7368a6c8 | 240 | |
241 | /* We found no reason not to let this user try to log on... */ | |
242 | return 1; | |
243 | } | |
59c97189 | 244 | |
59c97189 | 245 | void |
246 | auth_log(Authctxt *authctxt, int authenticated, char *method, char *info) | |
247 | { | |
248 | void (*authlog) (const char *fmt,...) = verbose; | |
249 | char *authmsg; | |
250 | ||
c023a130 | 251 | if (use_privsep && !mm_is_monitor() && !authctxt->postponed) |
252 | return; | |
253 | ||
59c97189 | 254 | /* Raise logging level */ |
255 | if (authenticated == 1 || | |
256 | !authctxt->valid || | |
af4bd935 | 257 | authctxt->failures >= options.max_authtries / 2 || |
59c97189 | 258 | strcmp(method, "password") == 0) |
a3568201 | 259 | authlog = logit; |
59c97189 | 260 | |
261 | if (authctxt->postponed) | |
262 | authmsg = "Postponed"; | |
263 | else | |
264 | authmsg = authenticated ? "Accepted" : "Failed"; | |
265 | ||
266 | authlog("%s %s for %s%.100s from %.200s port %d%s", | |
267 | authmsg, | |
268 | method, | |
d77347cc | 269 | authctxt->valid ? "" : "invalid user ", |
fad3754c | 270 | authctxt->user, |
59c97189 | 271 | get_remote_ipaddr(), |
272 | get_remote_port(), | |
273 | info); | |
56fd97d7 | 274 | |
73d9dad3 | 275 | #ifdef CUSTOM_FAILED_LOGIN |
b6610e8f | 276 | if (authenticated == 0 && !authctxt->postponed && |
277 | (strcmp(method, "password") == 0 || | |
6af6e631 | 278 | strncmp(method, "keyboard-interactive", 20) == 0 || |
279 | strcmp(method, "challenge-response") == 0)) | |
575e336f | 280 | record_failed_login(authctxt->user, |
281 | get_canonical_hostname(options.use_dns), "ssh"); | |
6545dd0b | 282 | # ifdef WITH_AIXAUTHENTICATE |
283 | if (authenticated) | |
284 | sys_auth_record_login(authctxt->user, | |
285 | get_canonical_hostname(options.use_dns), "ssh", &loginmsg); | |
286 | # endif | |
73d9dad3 | 287 | #endif |
6039eeef | 288 | #ifdef SSH_AUDIT_EVENTS |
2ae7f715 | 289 | if (authenticated == 0 && !authctxt->postponed) |
290 | audit_event(audit_classify_auth(method)); | |
c00e4d75 | 291 | #endif |
59c97189 | 292 | } |
293 | ||
294 | /* | |
15853e93 | 295 | * Check whether root logins are disallowed. |
59c97189 | 296 | */ |
297 | int | |
15853e93 | 298 | auth_root_allowed(char *method) |
59c97189 | 299 | { |
15853e93 | 300 | switch (options.permit_root_login) { |
301 | case PERMIT_YES: | |
59c97189 | 302 | return 1; |
15853e93 | 303 | case PERMIT_NO_PASSWD: |
304 | if (strcmp(method, "password") != 0) | |
305 | return 1; | |
306 | break; | |
307 | case PERMIT_FORCED_ONLY: | |
308 | if (forced_command) { | |
bbe88b6d | 309 | logit("Root login accepted for forced command."); |
15853e93 | 310 | return 1; |
311 | } | |
312 | break; | |
59c97189 | 313 | } |
bbe88b6d | 314 | logit("ROOT LOGIN REFUSED FROM %.200s", get_remote_ipaddr()); |
15853e93 | 315 | return 0; |
59c97189 | 316 | } |
c8445989 | 317 | |
318 | ||
319 | /* | |
320 | * Given a template and a passwd structure, build a filename | |
321 | * by substituting % tokenised options. Currently, %% becomes '%', | |
322 | * %h becomes the home directory and %u the username. | |
323 | * | |
324 | * This returns a buffer allocated by xmalloc. | |
325 | */ | |
a980cbd7 | 326 | static char * |
327 | expand_authorized_keys(const char *filename, struct passwd *pw) | |
c8445989 | 328 | { |
52e3daed | 329 | char *file, ret[MAXPATHLEN]; |
330 | int i; | |
c8445989 | 331 | |
a980cbd7 | 332 | file = percent_expand(filename, "h", pw->pw_dir, |
333 | "u", pw->pw_name, (char *)NULL); | |
c8445989 | 334 | |
335 | /* | |
336 | * Ensure that filename starts anchored. If not, be backward | |
337 | * compatible and prepend the '%h/' | |
338 | */ | |
a980cbd7 | 339 | if (*file == '/') |
340 | return (file); | |
341 | ||
52e3daed | 342 | i = snprintf(ret, sizeof(ret), "%s/%s", pw->pw_dir, file); |
343 | if (i < 0 || (size_t)i >= sizeof(ret)) | |
a980cbd7 | 344 | fatal("expand_authorized_keys: path too long"); |
a980cbd7 | 345 | xfree(file); |
52e3daed | 346 | return (xstrdup(ret)); |
c8445989 | 347 | } |
348 | ||
349 | char * | |
350 | authorized_keys_file(struct passwd *pw) | |
351 | { | |
a980cbd7 | 352 | return expand_authorized_keys(options.authorized_keys_file, pw); |
c8445989 | 353 | } |
354 | ||
355 | char * | |
356 | authorized_keys_file2(struct passwd *pw) | |
357 | { | |
a980cbd7 | 358 | return expand_authorized_keys(options.authorized_keys_file2, pw); |
c8445989 | 359 | } |
360 | ||
d0c8ca5c | 361 | /* return ok if key exists in sysfile or userfile */ |
362 | HostStatus | |
363 | check_key_in_hostfiles(struct passwd *pw, Key *key, const char *host, | |
364 | const char *sysfile, const char *userfile) | |
365 | { | |
366 | Key *found; | |
367 | char *user_hostfile; | |
368 | struct stat st; | |
17a3011c | 369 | HostStatus host_status; |
d0c8ca5c | 370 | |
371 | /* Check if we know the host and its host key. */ | |
372 | found = key_new(key->type); | |
373 | host_status = check_host_in_hostfile(sysfile, host, key, found, NULL); | |
374 | ||
375 | if (host_status != HOST_OK && userfile != NULL) { | |
376 | user_hostfile = tilde_expand_filename(userfile, pw->pw_uid); | |
377 | if (options.strict_modes && | |
378 | (stat(user_hostfile, &st) == 0) && | |
379 | ((st.st_uid != 0 && st.st_uid != pw->pw_uid) || | |
184eed6a | 380 | (st.st_mode & 022) != 0)) { |
bbe88b6d | 381 | logit("Authentication refused for %.100s: " |
d0c8ca5c | 382 | "bad owner or modes for %.200s", |
383 | pw->pw_name, user_hostfile); | |
384 | } else { | |
385 | temporarily_use_uid(pw); | |
386 | host_status = check_host_in_hostfile(user_hostfile, | |
387 | host, key, found, NULL); | |
388 | restore_uid(); | |
389 | } | |
390 | xfree(user_hostfile); | |
391 | } | |
392 | key_free(found); | |
393 | ||
394 | debug2("check_key_in_hostfiles: key %s for %s", host_status == HOST_OK ? | |
395 | "ok" : "not found", host); | |
396 | return host_status; | |
397 | } | |
398 | ||
399 | ||
c8445989 | 400 | /* |
401 | * Check a given file for security. This is defined as all components | |
d6097023 | 402 | * of the path to the file must be owned by either the owner of |
1ddf764b | 403 | * of the file or root and no directories must be group or world writable. |
c8445989 | 404 | * |
405 | * XXX Should any specific check be done for sym links ? | |
406 | * | |
407 | * Takes an open file descriptor, the file name, a uid and and | |
408 | * error buffer plus max size as arguments. | |
409 | * | |
410 | * Returns 0 on success and -1 on failure | |
411 | */ | |
412 | int | |
6978866a | 413 | secure_filename(FILE *f, const char *file, struct passwd *pw, |
414 | char *err, size_t errlen) | |
c8445989 | 415 | { |
6978866a | 416 | uid_t uid = pw->pw_uid; |
76fbdd47 | 417 | char buf[MAXPATHLEN], homedir[MAXPATHLEN]; |
c8445989 | 418 | char *cp; |
f6f02456 | 419 | int comparehome = 0; |
c8445989 | 420 | struct stat st; |
421 | ||
422 | if (realpath(file, buf) == NULL) { | |
423 | snprintf(err, errlen, "realpath %s failed: %s", file, | |
424 | strerror(errno)); | |
425 | return -1; | |
426 | } | |
f6f02456 | 427 | if (realpath(pw->pw_dir, homedir) != NULL) |
428 | comparehome = 1; | |
c8445989 | 429 | |
430 | /* check the open file to avoid races */ | |
431 | if (fstat(fileno(f), &st) < 0 || | |
432 | (st.st_uid != 0 && st.st_uid != uid) || | |
433 | (st.st_mode & 022) != 0) { | |
434 | snprintf(err, errlen, "bad ownership or modes for file %s", | |
435 | buf); | |
436 | return -1; | |
437 | } | |
438 | ||
439 | /* for each component of the canonical path, walking upwards */ | |
440 | for (;;) { | |
441 | if ((cp = dirname(buf)) == NULL) { | |
442 | snprintf(err, errlen, "dirname() failed"); | |
443 | return -1; | |
444 | } | |
445 | strlcpy(buf, cp, sizeof(buf)); | |
446 | ||
447 | debug3("secure_filename: checking '%s'", buf); | |
448 | if (stat(buf, &st) < 0 || | |
449 | (st.st_uid != 0 && st.st_uid != uid) || | |
450 | (st.st_mode & 022) != 0) { | |
184eed6a | 451 | snprintf(err, errlen, |
c8445989 | 452 | "bad ownership or modes for directory %s", buf); |
453 | return -1; | |
454 | } | |
455 | ||
afd501f9 | 456 | /* If are passed the homedir then we can stop */ |
f6f02456 | 457 | if (comparehome && strcmp(homedir, buf) == 0) { |
afd501f9 | 458 | debug3("secure_filename: terminating check at '%s'", |
459 | buf); | |
460 | break; | |
461 | } | |
c8445989 | 462 | /* |
463 | * dirname should always complete with a "/" path, | |
464 | * but we can be paranoid and check for "." too | |
465 | */ | |
466 | if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) | |
467 | break; | |
468 | } | |
469 | return 0; | |
470 | } | |
443fa1cd | 471 | |
472 | struct passwd * | |
473 | getpwnamallow(const char *user) | |
474 | { | |
1836f69f | 475 | #ifdef HAVE_LOGIN_CAP |
476 | extern login_cap_t *lc; | |
477 | #ifdef BSD_AUTH | |
478 | auth_session_t *as; | |
479 | #endif | |
480 | #endif | |
443fa1cd | 481 | struct passwd *pw; |
482 | ||
d231781a | 483 | parse_server_match_config(&options, user, |
484 | get_canonical_hostname(options.use_dns), get_remote_ipaddr()); | |
485 | ||
443fa1cd | 486 | pw = getpwnam(user); |
c2802d92 | 487 | if (pw == NULL) { |
227a6a97 | 488 | logit("Invalid user %.100s from %.100s", |
c2802d92 | 489 | user, get_remote_ipaddr()); |
73d9dad3 | 490 | #ifdef CUSTOM_FAILED_LOGIN |
575e336f | 491 | record_failed_login(user, |
492 | get_canonical_hostname(options.use_dns), "ssh"); | |
819d3f09 | 493 | #endif |
6039eeef | 494 | #ifdef SSH_AUDIT_EVENTS |
495 | audit_event(SSH_INVALID_USER); | |
496 | #endif /* SSH_AUDIT_EVENTS */ | |
c2802d92 | 497 | return (NULL); |
498 | } | |
499 | if (!allowed_user(pw)) | |
1836f69f | 500 | return (NULL); |
501 | #ifdef HAVE_LOGIN_CAP | |
502 | if ((lc = login_getclass(pw->pw_class)) == NULL) { | |
503 | debug("unable to get login class: %s", user); | |
504 | return (NULL); | |
505 | } | |
506 | #ifdef BSD_AUTH | |
507 | if ((as = auth_open()) == NULL || auth_setpwd(as, pw) != 0 || | |
65721f9c | 508 | auth_approval(as, lc, pw->pw_name, "ssh") <= 0) { |
1836f69f | 509 | debug("Approval failure for %s", user); |
443fa1cd | 510 | pw = NULL; |
1836f69f | 511 | } |
512 | if (as != NULL) | |
513 | auth_close(as); | |
514 | #endif | |
515 | #endif | |
06bea668 | 516 | if (pw != NULL) |
517 | return (pwcopy(pw)); | |
518 | return (NULL); | |
443fa1cd | 519 | } |
01dafcb5 | 520 | |
521 | void | |
522 | auth_debug_add(const char *fmt,...) | |
523 | { | |
524 | char buf[1024]; | |
525 | va_list args; | |
526 | ||
527 | if (!auth_debug_init) | |
528 | return; | |
529 | ||
530 | va_start(args, fmt); | |
531 | vsnprintf(buf, sizeof(buf), fmt, args); | |
532 | va_end(args); | |
533 | buffer_put_cstring(&auth_debug, buf); | |
534 | } | |
535 | ||
536 | void | |
537 | auth_debug_send(void) | |
538 | { | |
539 | char *msg; | |
540 | ||
541 | if (!auth_debug_init) | |
542 | return; | |
543 | while (buffer_len(&auth_debug)) { | |
544 | msg = buffer_get_string(&auth_debug, NULL); | |
545 | packet_send_debug("%s", msg); | |
546 | xfree(msg); | |
547 | } | |
548 | } | |
549 | ||
550 | void | |
551 | auth_debug_reset(void) | |
552 | { | |
553 | if (auth_debug_init) | |
554 | buffer_clear(&auth_debug); | |
555 | else { | |
556 | buffer_init(&auth_debug); | |
557 | auth_debug_init = 1; | |
558 | } | |
559 | } | |
96d0bf74 | 560 | |
561 | struct passwd * | |
562 | fakepw(void) | |
563 | { | |
564 | static struct passwd fake; | |
565 | ||
566 | memset(&fake, 0, sizeof(fake)); | |
567 | fake.pw_name = "NOUSER"; | |
568 | fake.pw_passwd = | |
b6453d99 | 569 | "$2a$06$r3.juUaHZDlIbQaO2dS9FuYxL1W9M81R1Tc92PoSNmzvpEqLkLGrK"; |
96d0bf74 | 570 | fake.pw_gecos = "NOUSER"; |
f6be21a0 | 571 | fake.pw_uid = (uid_t)-1; |
572 | fake.pw_gid = (gid_t)-1; | |
96d0bf74 | 573 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
574 | fake.pw_class = ""; | |
575 | #endif | |
576 | fake.pw_dir = "/nonexist"; | |
577 | fake.pw_shell = "/nonexist"; | |
578 | ||
579 | return (&fake); | |
580 | } |