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52e1856c | 1 | /* $OpenBSD: auth.c,v 1.82 2010/01/13 00:19:04 dtucker 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> |
f7c2a004 | 35 | #include <fcntl.h> |
a75f5360 | 36 | #ifdef HAVE_PATHS_H |
6f61e0ec | 37 | # include <paths.h> |
a75f5360 | 38 | #endif |
b1842393 | 39 | #include <pwd.h> |
c1ef8333 | 40 | #ifdef HAVE_LOGIN_H |
41 | #include <login.h> | |
42 | #endif | |
f14ca4a4 | 43 | #ifdef USE_SHADOW |
4cb5ffa0 | 44 | #include <shadow.h> |
f14ca4a4 | 45 | #endif |
b4d02860 | 46 | #ifdef HAVE_LIBGEN_H |
c8445989 | 47 | #include <libgen.h> |
b4d02860 | 48 | #endif |
4c72fcfd | 49 | #include <stdarg.h> |
cf851879 | 50 | #include <stdio.h> |
00146caa | 51 | #include <string.h> |
78cb4705 | 52 | #include <unistd.h> |
c8445989 | 53 | |
42f11eb2 | 54 | #include "xmalloc.h" |
55 | #include "match.h" | |
56 | #include "groupaccess.h" | |
57 | #include "log.h" | |
31652869 | 58 | #include "buffer.h" |
42f11eb2 | 59 | #include "servconf.h" |
31652869 | 60 | #include "key.h" |
61 | #include "hostfile.h" | |
e78a59f5 | 62 | #include "auth.h" |
59c97189 | 63 | #include "auth-options.h" |
42f11eb2 | 64 | #include "canohost.h" |
d0c8ca5c | 65 | #include "uidswap.h" |
5f1f36b5 | 66 | #include "misc.h" |
01dafcb5 | 67 | #include "packet.h" |
575e336f | 68 | #include "loginrec.h" |
31652869 | 69 | #ifdef GSSAPI |
70 | #include "ssh-gss.h" | |
71 | #endif | |
c00e4d75 | 72 | #include "monitor_wrap.h" |
e78a59f5 | 73 | |
7368a6c8 | 74 | /* import */ |
75 | extern ServerOptions options; | |
c023a130 | 76 | extern int use_privsep; |
bc7dfc06 | 77 | extern Buffer loginmsg; |
a078cbee | 78 | extern struct passwd *privsep_pw; |
7368a6c8 | 79 | |
01dafcb5 | 80 | /* Debugging messages */ |
81 | Buffer auth_debug; | |
82 | int auth_debug_init; | |
83 | ||
7368a6c8 | 84 | /* |
c6a69271 | 85 | * Check if the user is allowed to log in via ssh. If user is listed |
86 | * in DenyUsers or one of user's groups is listed in DenyGroups, false | |
87 | * will be returned. If AllowUsers isn't empty and user isn't listed | |
88 | * there, or if AllowGroups isn't empty and one of user's groups isn't | |
89 | * listed there, false will be returned. | |
7368a6c8 | 90 | * If the user's shell is not executable, false will be returned. |
6ae2364d | 91 | * Otherwise true is returned. |
7368a6c8 | 92 | */ |
a306f2dd | 93 | int |
7368a6c8 | 94 | allowed_user(struct passwd * pw) |
95 | { | |
96 | struct stat st; | |
da67ae18 | 97 | const char *hostname = NULL, *ipaddr = NULL, *passwd = NULL; |
614dee3a | 98 | char *shell; |
2ceb8101 | 99 | u_int i; |
f14ca4a4 | 100 | #ifdef USE_SHADOW |
3e6e3da0 | 101 | struct spwd *spw = NULL; |
e2ef2342 | 102 | #endif |
7368a6c8 | 103 | |
104 | /* Shouldn't be called if pw is NULL, but better safe than sorry... */ | |
c6a69271 | 105 | if (!pw || !pw->pw_name) |
7368a6c8 | 106 | return 0; |
107 | ||
f14ca4a4 | 108 | #ifdef USE_SHADOW |
3e6e3da0 | 109 | if (!options.use_pam) |
110 | spw = getspnam(pw->pw_name); | |
111 | #ifdef HAS_SHADOW_EXPIRE | |
f14ca4a4 | 112 | if (!options.use_pam && spw != NULL && auth_shadow_acctexpired(spw)) |
113 | return 0; | |
3e6e3da0 | 114 | #endif /* HAS_SHADOW_EXPIRE */ |
f14ca4a4 | 115 | #endif /* USE_SHADOW */ |
3e6e3da0 | 116 | |
aff51935 | 117 | /* grab passwd field for locked account check */ |
3fde0623 | 118 | passwd = pw->pw_passwd; |
f14ca4a4 | 119 | #ifdef USE_SHADOW |
3e6e3da0 | 120 | if (spw != NULL) |
a03acb8f | 121 | #ifdef USE_LIBIAF |
4c653d8e | 122 | passwd = get_iaf_password(pw); |
123 | #else | |
3e6e3da0 | 124 | passwd = spw->sp_pwdp; |
a03acb8f | 125 | #endif /* USE_LIBIAF */ |
b57c8e20 | 126 | #endif |
127 | ||
aff51935 | 128 | /* check for locked account */ |
da67ae18 | 129 | if (!options.use_pam && passwd && *passwd) { |
3e6e3da0 | 130 | int locked = 0; |
131 | ||
132 | #ifdef LOCKED_PASSWD_STRING | |
133 | if (strcmp(passwd, LOCKED_PASSWD_STRING) == 0) | |
134 | locked = 1; | |
135 | #endif | |
136 | #ifdef LOCKED_PASSWD_PREFIX | |
137 | if (strncmp(passwd, LOCKED_PASSWD_PREFIX, | |
138 | strlen(LOCKED_PASSWD_PREFIX)) == 0) | |
139 | locked = 1; | |
140 | #endif | |
141 | #ifdef LOCKED_PASSWD_SUBSTR | |
142 | if (strstr(passwd, LOCKED_PASSWD_SUBSTR)) | |
143 | locked = 1; | |
144 | #endif | |
a03acb8f | 145 | #ifdef USE_LIBIAF |
26d07095 | 146 | free(passwd); |
a03acb8f | 147 | #endif /* USE_LIBIAF */ |
3e6e3da0 | 148 | if (locked) { |
149 | logit("User %.100s not allowed because account is locked", | |
150 | pw->pw_name); | |
151 | return 0; | |
152 | } | |
153 | } | |
154 | ||
301e9b01 | 155 | /* |
156 | * Get the shell from the password data. An empty shell field is | |
157 | * legal, and means /bin/sh. | |
158 | */ | |
159 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
160 | ||
161 | /* deny if shell does not exists or is not executable */ | |
b334badd | 162 | if (stat(shell, &st) != 0) { |
bbe88b6d | 163 | logit("User %.100s not allowed because shell %.100s does not exist", |
b334badd | 164 | pw->pw_name, shell); |
7368a6c8 | 165 | return 0; |
b334badd | 166 | } |
c390a3c8 | 167 | if (S_ISREG(st.st_mode) == 0 || |
168 | (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)) == 0) { | |
bbe88b6d | 169 | logit("User %.100s not allowed because shell %.100s is not executable", |
b334badd | 170 | pw->pw_name, shell); |
7368a6c8 | 171 | return 0; |
b334badd | 172 | } |
7368a6c8 | 173 | |
2dcbac07 | 174 | if (options.num_deny_users > 0 || options.num_allow_users > 0 || |
175 | options.num_deny_groups > 0 || options.num_allow_groups > 0) { | |
c5a7d788 | 176 | hostname = get_canonical_hostname(options.use_dns); |
6805fc56 | 177 | ipaddr = get_remote_ipaddr(); |
178 | } | |
179 | ||
7368a6c8 | 180 | /* Return false if user is listed in DenyUsers */ |
181 | if (options.num_deny_users > 0) { | |
7368a6c8 | 182 | for (i = 0; i < options.num_deny_users; i++) |
762715ce | 183 | if (match_user(pw->pw_name, hostname, ipaddr, |
b334badd | 184 | options.deny_users[i])) { |
31de8b2b | 185 | logit("User %.100s from %.100s not allowed " |
186 | "because listed in DenyUsers", | |
187 | pw->pw_name, hostname); | |
7368a6c8 | 188 | return 0; |
b334badd | 189 | } |
7368a6c8 | 190 | } |
191 | /* Return false if AllowUsers isn't empty and user isn't listed there */ | |
192 | if (options.num_allow_users > 0) { | |
7368a6c8 | 193 | for (i = 0; i < options.num_allow_users; i++) |
762715ce | 194 | if (match_user(pw->pw_name, hostname, ipaddr, |
80f8f24f | 195 | options.allow_users[i])) |
7368a6c8 | 196 | break; |
197 | /* i < options.num_allow_users iff we break for loop */ | |
b334badd | 198 | if (i >= options.num_allow_users) { |
31de8b2b | 199 | logit("User %.100s from %.100s not allowed because " |
200 | "not listed in AllowUsers", pw->pw_name, hostname); | |
7368a6c8 | 201 | return 0; |
b334badd | 202 | } |
7368a6c8 | 203 | } |
7368a6c8 | 204 | if (options.num_deny_groups > 0 || options.num_allow_groups > 0) { |
c6a69271 | 205 | /* Get the user's group access list (primary and supplementary) */ |
b334badd | 206 | if (ga_init(pw->pw_name, pw->pw_gid) == 0) { |
31de8b2b | 207 | logit("User %.100s from %.100s not allowed because " |
208 | "not in any group", pw->pw_name, hostname); | |
7368a6c8 | 209 | return 0; |
b334badd | 210 | } |
7368a6c8 | 211 | |
c6a69271 | 212 | /* Return false if one of user's groups is listed in DenyGroups */ |
213 | if (options.num_deny_groups > 0) | |
214 | if (ga_match(options.deny_groups, | |
215 | options.num_deny_groups)) { | |
216 | ga_free(); | |
31de8b2b | 217 | logit("User %.100s from %.100s not allowed " |
218 | "because a group is listed in DenyGroups", | |
219 | pw->pw_name, hostname); | |
7368a6c8 | 220 | return 0; |
c6a69271 | 221 | } |
7368a6c8 | 222 | /* |
c6a69271 | 223 | * Return false if AllowGroups isn't empty and one of user's groups |
7368a6c8 | 224 | * isn't listed there |
225 | */ | |
c6a69271 | 226 | if (options.num_allow_groups > 0) |
227 | if (!ga_match(options.allow_groups, | |
228 | options.num_allow_groups)) { | |
229 | ga_free(); | |
31de8b2b | 230 | logit("User %.100s from %.100s not allowed " |
231 | "because none of user's groups are listed " | |
232 | "in AllowGroups", pw->pw_name, hostname); | |
7368a6c8 | 233 | return 0; |
c6a69271 | 234 | } |
235 | ga_free(); | |
7368a6c8 | 236 | } |
237 | ||
bc5c2025 | 238 | #ifdef CUSTOM_SYS_AUTH_ALLOWED_USER |
5ccf88cb | 239 | if (!sys_auth_allowed_user(pw, &loginmsg)) |
bc5c2025 | 240 | return 0; |
241 | #endif | |
7368a6c8 | 242 | |
243 | /* We found no reason not to let this user try to log on... */ | |
244 | return 1; | |
245 | } | |
59c97189 | 246 | |
59c97189 | 247 | void |
248 | auth_log(Authctxt *authctxt, int authenticated, char *method, char *info) | |
249 | { | |
250 | void (*authlog) (const char *fmt,...) = verbose; | |
251 | char *authmsg; | |
252 | ||
c023a130 | 253 | if (use_privsep && !mm_is_monitor() && !authctxt->postponed) |
254 | return; | |
255 | ||
59c97189 | 256 | /* Raise logging level */ |
257 | if (authenticated == 1 || | |
258 | !authctxt->valid || | |
af4bd935 | 259 | authctxt->failures >= options.max_authtries / 2 || |
59c97189 | 260 | strcmp(method, "password") == 0) |
a3568201 | 261 | authlog = logit; |
59c97189 | 262 | |
263 | if (authctxt->postponed) | |
264 | authmsg = "Postponed"; | |
265 | else | |
266 | authmsg = authenticated ? "Accepted" : "Failed"; | |
267 | ||
268 | authlog("%s %s for %s%.100s from %.200s port %d%s", | |
269 | authmsg, | |
270 | method, | |
d77347cc | 271 | authctxt->valid ? "" : "invalid user ", |
fad3754c | 272 | authctxt->user, |
59c97189 | 273 | get_remote_ipaddr(), |
274 | get_remote_port(), | |
275 | info); | |
56fd97d7 | 276 | |
73d9dad3 | 277 | #ifdef CUSTOM_FAILED_LOGIN |
b6610e8f | 278 | if (authenticated == 0 && !authctxt->postponed && |
279 | (strcmp(method, "password") == 0 || | |
6af6e631 | 280 | strncmp(method, "keyboard-interactive", 20) == 0 || |
281 | strcmp(method, "challenge-response") == 0)) | |
575e336f | 282 | record_failed_login(authctxt->user, |
283 | get_canonical_hostname(options.use_dns), "ssh"); | |
6545dd0b | 284 | # ifdef WITH_AIXAUTHENTICATE |
285 | if (authenticated) | |
286 | sys_auth_record_login(authctxt->user, | |
287 | get_canonical_hostname(options.use_dns), "ssh", &loginmsg); | |
288 | # endif | |
73d9dad3 | 289 | #endif |
6039eeef | 290 | #ifdef SSH_AUDIT_EVENTS |
2ae7f715 | 291 | if (authenticated == 0 && !authctxt->postponed) |
292 | audit_event(audit_classify_auth(method)); | |
c00e4d75 | 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 | case PERMIT_NO_PASSWD: |
306 | if (strcmp(method, "password") != 0) | |
307 | return 1; | |
308 | break; | |
309 | case PERMIT_FORCED_ONLY: | |
310 | if (forced_command) { | |
bbe88b6d | 311 | logit("Root login accepted for forced command."); |
15853e93 | 312 | return 1; |
313 | } | |
314 | break; | |
59c97189 | 315 | } |
bbe88b6d | 316 | logit("ROOT LOGIN REFUSED FROM %.200s", get_remote_ipaddr()); |
15853e93 | 317 | return 0; |
59c97189 | 318 | } |
c8445989 | 319 | |
320 | ||
321 | /* | |
322 | * Given a template and a passwd structure, build a filename | |
323 | * by substituting % tokenised options. Currently, %% becomes '%', | |
324 | * %h becomes the home directory and %u the username. | |
325 | * | |
326 | * This returns a buffer allocated by xmalloc. | |
327 | */ | |
a980cbd7 | 328 | static char * |
329 | expand_authorized_keys(const char *filename, struct passwd *pw) | |
c8445989 | 330 | { |
52e3daed | 331 | char *file, ret[MAXPATHLEN]; |
332 | int i; | |
c8445989 | 333 | |
a980cbd7 | 334 | file = percent_expand(filename, "h", pw->pw_dir, |
335 | "u", pw->pw_name, (char *)NULL); | |
c8445989 | 336 | |
337 | /* | |
338 | * Ensure that filename starts anchored. If not, be backward | |
339 | * compatible and prepend the '%h/' | |
340 | */ | |
a980cbd7 | 341 | if (*file == '/') |
342 | return (file); | |
343 | ||
52e3daed | 344 | i = snprintf(ret, sizeof(ret), "%s/%s", pw->pw_dir, file); |
345 | if (i < 0 || (size_t)i >= sizeof(ret)) | |
a980cbd7 | 346 | fatal("expand_authorized_keys: path too long"); |
a980cbd7 | 347 | xfree(file); |
52e3daed | 348 | return (xstrdup(ret)); |
c8445989 | 349 | } |
350 | ||
351 | char * | |
352 | authorized_keys_file(struct passwd *pw) | |
353 | { | |
a980cbd7 | 354 | return expand_authorized_keys(options.authorized_keys_file, pw); |
c8445989 | 355 | } |
356 | ||
357 | char * | |
358 | authorized_keys_file2(struct passwd *pw) | |
359 | { | |
a980cbd7 | 360 | return expand_authorized_keys(options.authorized_keys_file2, pw); |
c8445989 | 361 | } |
362 | ||
d0c8ca5c | 363 | /* return ok if key exists in sysfile or userfile */ |
364 | HostStatus | |
365 | check_key_in_hostfiles(struct passwd *pw, Key *key, const char *host, | |
366 | const char *sysfile, const char *userfile) | |
367 | { | |
368 | Key *found; | |
369 | char *user_hostfile; | |
370 | struct stat st; | |
17a3011c | 371 | HostStatus host_status; |
d0c8ca5c | 372 | |
373 | /* Check if we know the host and its host key. */ | |
374 | found = key_new(key->type); | |
375 | host_status = check_host_in_hostfile(sysfile, host, key, found, NULL); | |
376 | ||
377 | if (host_status != HOST_OK && userfile != NULL) { | |
378 | user_hostfile = tilde_expand_filename(userfile, pw->pw_uid); | |
379 | if (options.strict_modes && | |
380 | (stat(user_hostfile, &st) == 0) && | |
381 | ((st.st_uid != 0 && st.st_uid != pw->pw_uid) || | |
184eed6a | 382 | (st.st_mode & 022) != 0)) { |
bbe88b6d | 383 | logit("Authentication refused for %.100s: " |
d0c8ca5c | 384 | "bad owner or modes for %.200s", |
385 | pw->pw_name, user_hostfile); | |
386 | } else { | |
387 | temporarily_use_uid(pw); | |
388 | host_status = check_host_in_hostfile(user_hostfile, | |
389 | host, key, found, NULL); | |
390 | restore_uid(); | |
391 | } | |
392 | xfree(user_hostfile); | |
393 | } | |
394 | key_free(found); | |
395 | ||
396 | debug2("check_key_in_hostfiles: key %s for %s", host_status == HOST_OK ? | |
397 | "ok" : "not found", host); | |
398 | return host_status; | |
399 | } | |
400 | ||
401 | ||
c8445989 | 402 | /* |
403 | * Check a given file for security. This is defined as all components | |
d6097023 | 404 | * of the path to the file must be owned by either the owner of |
1ddf764b | 405 | * of the file or root and no directories must be group or world writable. |
c8445989 | 406 | * |
407 | * XXX Should any specific check be done for sym links ? | |
408 | * | |
409 | * Takes an open file descriptor, the file name, a uid and and | |
410 | * error buffer plus max size as arguments. | |
411 | * | |
412 | * Returns 0 on success and -1 on failure | |
413 | */ | |
f7c2a004 | 414 | static int |
6978866a | 415 | secure_filename(FILE *f, const char *file, struct passwd *pw, |
416 | char *err, size_t errlen) | |
c8445989 | 417 | { |
6978866a | 418 | uid_t uid = pw->pw_uid; |
76fbdd47 | 419 | char buf[MAXPATHLEN], homedir[MAXPATHLEN]; |
c8445989 | 420 | char *cp; |
f6f02456 | 421 | int comparehome = 0; |
c8445989 | 422 | struct stat st; |
423 | ||
424 | if (realpath(file, buf) == NULL) { | |
425 | snprintf(err, errlen, "realpath %s failed: %s", file, | |
426 | strerror(errno)); | |
427 | return -1; | |
428 | } | |
f6f02456 | 429 | if (realpath(pw->pw_dir, homedir) != NULL) |
430 | comparehome = 1; | |
c8445989 | 431 | |
432 | /* check the open file to avoid races */ | |
433 | if (fstat(fileno(f), &st) < 0 || | |
434 | (st.st_uid != 0 && st.st_uid != uid) || | |
435 | (st.st_mode & 022) != 0) { | |
436 | snprintf(err, errlen, "bad ownership or modes for file %s", | |
437 | buf); | |
438 | return -1; | |
439 | } | |
440 | ||
441 | /* for each component of the canonical path, walking upwards */ | |
442 | for (;;) { | |
443 | if ((cp = dirname(buf)) == NULL) { | |
444 | snprintf(err, errlen, "dirname() failed"); | |
445 | return -1; | |
446 | } | |
447 | strlcpy(buf, cp, sizeof(buf)); | |
448 | ||
449 | debug3("secure_filename: checking '%s'", buf); | |
450 | if (stat(buf, &st) < 0 || | |
451 | (st.st_uid != 0 && st.st_uid != uid) || | |
452 | (st.st_mode & 022) != 0) { | |
184eed6a | 453 | snprintf(err, errlen, |
c8445989 | 454 | "bad ownership or modes for directory %s", buf); |
455 | return -1; | |
456 | } | |
457 | ||
52e1856c | 458 | /* If are past the homedir then we can stop */ |
f6f02456 | 459 | if (comparehome && strcmp(homedir, buf) == 0) { |
afd501f9 | 460 | debug3("secure_filename: terminating check at '%s'", |
461 | buf); | |
462 | break; | |
463 | } | |
c8445989 | 464 | /* |
465 | * dirname should always complete with a "/" path, | |
466 | * but we can be paranoid and check for "." too | |
467 | */ | |
468 | if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) | |
469 | break; | |
470 | } | |
471 | return 0; | |
472 | } | |
443fa1cd | 473 | |
f7c2a004 | 474 | FILE * |
475 | auth_openkeyfile(const char *file, struct passwd *pw, int strict_modes) | |
476 | { | |
477 | char line[1024]; | |
478 | struct stat st; | |
479 | int fd; | |
480 | FILE *f; | |
481 | ||
482 | /* | |
483 | * Open the file containing the authorized keys | |
484 | * Fail quietly if file does not exist | |
485 | */ | |
5deb8b6e | 486 | if ((fd = open(file, O_RDONLY|O_NONBLOCK)) == -1) { |
487 | if (errno != ENOENT) | |
488 | debug("Could not open keyfile '%s': %s", file, | |
489 | strerror(errno)); | |
f7c2a004 | 490 | return NULL; |
5deb8b6e | 491 | } |
f7c2a004 | 492 | |
493 | if (fstat(fd, &st) < 0) { | |
494 | close(fd); | |
495 | return NULL; | |
496 | } | |
497 | if (!S_ISREG(st.st_mode)) { | |
498 | logit("User %s authorized keys %s is not a regular file", | |
499 | pw->pw_name, file); | |
500 | close(fd); | |
501 | return NULL; | |
502 | } | |
503 | unset_nonblock(fd); | |
504 | if ((f = fdopen(fd, "r")) == NULL) { | |
505 | close(fd); | |
506 | return NULL; | |
507 | } | |
508 | if (options.strict_modes && | |
509 | secure_filename(f, file, pw, line, sizeof(line)) != 0) { | |
510 | fclose(f); | |
511 | logit("Authentication refused: %s", line); | |
512 | return NULL; | |
513 | } | |
514 | ||
515 | return f; | |
516 | } | |
517 | ||
443fa1cd | 518 | struct passwd * |
519 | getpwnamallow(const char *user) | |
520 | { | |
1836f69f | 521 | #ifdef HAVE_LOGIN_CAP |
522 | extern login_cap_t *lc; | |
523 | #ifdef BSD_AUTH | |
524 | auth_session_t *as; | |
525 | #endif | |
526 | #endif | |
443fa1cd | 527 | struct passwd *pw; |
528 | ||
d231781a | 529 | parse_server_match_config(&options, user, |
530 | get_canonical_hostname(options.use_dns), get_remote_ipaddr()); | |
531 | ||
443fa1cd | 532 | pw = getpwnam(user); |
c2802d92 | 533 | if (pw == NULL) { |
227a6a97 | 534 | logit("Invalid user %.100s from %.100s", |
c2802d92 | 535 | user, get_remote_ipaddr()); |
73d9dad3 | 536 | #ifdef CUSTOM_FAILED_LOGIN |
575e336f | 537 | record_failed_login(user, |
538 | get_canonical_hostname(options.use_dns), "ssh"); | |
819d3f09 | 539 | #endif |
6039eeef | 540 | #ifdef SSH_AUDIT_EVENTS |
541 | audit_event(SSH_INVALID_USER); | |
542 | #endif /* SSH_AUDIT_EVENTS */ | |
c2802d92 | 543 | return (NULL); |
544 | } | |
545 | if (!allowed_user(pw)) | |
1836f69f | 546 | return (NULL); |
547 | #ifdef HAVE_LOGIN_CAP | |
548 | if ((lc = login_getclass(pw->pw_class)) == NULL) { | |
549 | debug("unable to get login class: %s", user); | |
550 | return (NULL); | |
551 | } | |
552 | #ifdef BSD_AUTH | |
553 | if ((as = auth_open()) == NULL || auth_setpwd(as, pw) != 0 || | |
65721f9c | 554 | auth_approval(as, lc, pw->pw_name, "ssh") <= 0) { |
1836f69f | 555 | debug("Approval failure for %s", user); |
443fa1cd | 556 | pw = NULL; |
1836f69f | 557 | } |
558 | if (as != NULL) | |
559 | auth_close(as); | |
560 | #endif | |
561 | #endif | |
06bea668 | 562 | if (pw != NULL) |
563 | return (pwcopy(pw)); | |
564 | return (NULL); | |
443fa1cd | 565 | } |
01dafcb5 | 566 | |
567 | void | |
568 | auth_debug_add(const char *fmt,...) | |
569 | { | |
570 | char buf[1024]; | |
571 | va_list args; | |
572 | ||
573 | if (!auth_debug_init) | |
574 | return; | |
575 | ||
576 | va_start(args, fmt); | |
577 | vsnprintf(buf, sizeof(buf), fmt, args); | |
578 | va_end(args); | |
579 | buffer_put_cstring(&auth_debug, buf); | |
580 | } | |
581 | ||
582 | void | |
583 | auth_debug_send(void) | |
584 | { | |
585 | char *msg; | |
586 | ||
587 | if (!auth_debug_init) | |
588 | return; | |
589 | while (buffer_len(&auth_debug)) { | |
590 | msg = buffer_get_string(&auth_debug, NULL); | |
591 | packet_send_debug("%s", msg); | |
592 | xfree(msg); | |
593 | } | |
594 | } | |
595 | ||
596 | void | |
597 | auth_debug_reset(void) | |
598 | { | |
599 | if (auth_debug_init) | |
600 | buffer_clear(&auth_debug); | |
601 | else { | |
602 | buffer_init(&auth_debug); | |
603 | auth_debug_init = 1; | |
604 | } | |
605 | } | |
96d0bf74 | 606 | |
607 | struct passwd * | |
608 | fakepw(void) | |
609 | { | |
610 | static struct passwd fake; | |
611 | ||
612 | memset(&fake, 0, sizeof(fake)); | |
613 | fake.pw_name = "NOUSER"; | |
614 | fake.pw_passwd = | |
b6453d99 | 615 | "$2a$06$r3.juUaHZDlIbQaO2dS9FuYxL1W9M81R1Tc92PoSNmzvpEqLkLGrK"; |
96d0bf74 | 616 | fake.pw_gecos = "NOUSER"; |
2b563deb | 617 | fake.pw_uid = privsep_pw == NULL ? (uid_t)-1 : privsep_pw->pw_uid; |
618 | fake.pw_gid = privsep_pw == NULL ? (gid_t)-1 : privsep_pw->pw_gid; | |
96d0bf74 | 619 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
620 | fake.pw_class = ""; | |
621 | #endif | |
622 | fake.pw_dir = "/nonexist"; | |
623 | fake.pw_shell = "/nonexist"; | |
624 | ||
625 | return (&fake); | |
626 | } |