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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" | |
c5a7d788 | 26 | RCSID("$OpenBSD: auth.c,v 1.48 2003/06/02 09:17:34 markus Exp $"); |
7368a6c8 | 27 | |
c1ef8333 | 28 | #ifdef HAVE_LOGIN_H |
29 | #include <login.h> | |
30 | #endif | |
4cb5ffa0 | 31 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) |
32 | #include <shadow.h> | |
33 | #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ | |
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" |
50 | #include "tildexpand.h" | |
5f1f36b5 | 51 | #include "misc.h" |
01dafcb5 | 52 | #include "bufaux.h" |
53 | #include "packet.h" | |
e78a59f5 | 54 | |
7368a6c8 | 55 | /* import */ |
56 | extern ServerOptions options; | |
bc7dfc06 | 57 | extern Buffer loginmsg; |
7368a6c8 | 58 | |
01dafcb5 | 59 | /* Debugging messages */ |
60 | Buffer auth_debug; | |
61 | int auth_debug_init; | |
62 | ||
7368a6c8 | 63 | /* |
c6a69271 | 64 | * Check if the user is allowed to log in via ssh. If user is listed |
65 | * in DenyUsers or one of user's groups is listed in DenyGroups, false | |
66 | * will be returned. If AllowUsers isn't empty and user isn't listed | |
67 | * there, or if AllowGroups isn't empty and one of user's groups isn't | |
68 | * listed there, false will be returned. | |
7368a6c8 | 69 | * If the user's shell is not executable, false will be returned. |
6ae2364d | 70 | * Otherwise true is returned. |
7368a6c8 | 71 | */ |
a306f2dd | 72 | int |
7368a6c8 | 73 | allowed_user(struct passwd * pw) |
74 | { | |
75 | struct stat st; | |
da67ae18 | 76 | const char *hostname = NULL, *ipaddr = NULL, *passwd = NULL; |
614dee3a | 77 | char *shell; |
7368a6c8 | 78 | int i; |
3e6e3da0 | 79 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) |
80 | struct spwd *spw = NULL; | |
e2ef2342 | 81 | #endif |
7368a6c8 | 82 | |
83 | /* Shouldn't be called if pw is NULL, but better safe than sorry... */ | |
c6a69271 | 84 | if (!pw || !pw->pw_name) |
7368a6c8 | 85 | return 0; |
86 | ||
3e6e3da0 | 87 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) |
88 | if (!options.use_pam) | |
89 | spw = getspnam(pw->pw_name); | |
90 | #ifdef HAS_SHADOW_EXPIRE | |
b57c8e20 | 91 | #define DAY (24L * 60 * 60) /* 1 day in seconds */ |
3e6e3da0 | 92 | if (!options.use_pam && spw != NULL) { |
93 | time_t today; | |
94 | ||
5ed5468f | 95 | today = time(NULL) / DAY; |
96 | debug3("allowed_user: today %d sp_expire %d sp_lstchg %d" | |
97 | " sp_max %d", (int)today, (int)spw->sp_expire, | |
98 | (int)spw->sp_lstchg, (int)spw->sp_max); | |
b57c8e20 | 99 | |
5ed5468f | 100 | /* |
101 | * We assume account and password expiration occurs the | |
102 | * day after the day specified. | |
103 | */ | |
104 | if (spw->sp_expire != -1 && today > spw->sp_expire) { | |
bbe88b6d | 105 | logit("Account %.100s has expired", pw->pw_name); |
5ed5468f | 106 | return 0; |
107 | } | |
b57c8e20 | 108 | |
5ed5468f | 109 | if (spw->sp_lstchg == 0) { |
bbe88b6d | 110 | logit("User %.100s password has expired (root forced)", |
5ed5468f | 111 | pw->pw_name); |
112 | return 0; | |
113 | } | |
b57c8e20 | 114 | |
5ed5468f | 115 | if (spw->sp_max != -1 && |
116 | today > spw->sp_lstchg + spw->sp_max) { | |
bbe88b6d | 117 | logit("User %.100s password has expired (password aged)", |
5ed5468f | 118 | pw->pw_name); |
119 | return 0; | |
120 | } | |
b57c8e20 | 121 | } |
3e6e3da0 | 122 | #endif /* HAS_SHADOW_EXPIRE */ |
123 | #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ | |
124 | ||
125 | /* grab passwd field for locked account check */ | |
126 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) | |
127 | if (spw != NULL) | |
128 | passwd = spw->sp_pwdp; | |
129 | #else | |
130 | passwd = pw->pw_passwd; | |
b57c8e20 | 131 | #endif |
132 | ||
3e6e3da0 | 133 | /* check for locked account */ |
da67ae18 | 134 | if (!options.use_pam && passwd && *passwd) { |
3e6e3da0 | 135 | int locked = 0; |
136 | ||
137 | #ifdef LOCKED_PASSWD_STRING | |
138 | if (strcmp(passwd, LOCKED_PASSWD_STRING) == 0) | |
139 | locked = 1; | |
140 | #endif | |
141 | #ifdef LOCKED_PASSWD_PREFIX | |
142 | if (strncmp(passwd, LOCKED_PASSWD_PREFIX, | |
143 | strlen(LOCKED_PASSWD_PREFIX)) == 0) | |
144 | locked = 1; | |
145 | #endif | |
146 | #ifdef LOCKED_PASSWD_SUBSTR | |
147 | if (strstr(passwd, LOCKED_PASSWD_SUBSTR)) | |
148 | locked = 1; | |
149 | #endif | |
150 | if (locked) { | |
151 | logit("User %.100s not allowed because account is locked", | |
152 | pw->pw_name); | |
153 | return 0; | |
154 | } | |
155 | } | |
156 | ||
301e9b01 | 157 | /* |
158 | * Get the shell from the password data. An empty shell field is | |
159 | * legal, and means /bin/sh. | |
160 | */ | |
161 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
162 | ||
163 | /* deny if shell does not exists or is not executable */ | |
b334badd | 164 | if (stat(shell, &st) != 0) { |
bbe88b6d | 165 | logit("User %.100s not allowed because shell %.100s does not exist", |
b334badd | 166 | pw->pw_name, shell); |
7368a6c8 | 167 | return 0; |
b334badd | 168 | } |
c390a3c8 | 169 | if (S_ISREG(st.st_mode) == 0 || |
170 | (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)) == 0) { | |
bbe88b6d | 171 | logit("User %.100s not allowed because shell %.100s is not executable", |
b334badd | 172 | pw->pw_name, shell); |
7368a6c8 | 173 | return 0; |
b334badd | 174 | } |
7368a6c8 | 175 | |
6805fc56 | 176 | if (options.num_deny_users > 0 || options.num_allow_users > 0) { |
c5a7d788 | 177 | hostname = get_canonical_hostname(options.use_dns); |
6805fc56 | 178 | ipaddr = get_remote_ipaddr(); |
179 | } | |
180 | ||
7368a6c8 | 181 | /* Return false if user is listed in DenyUsers */ |
182 | if (options.num_deny_users > 0) { | |
7368a6c8 | 183 | for (i = 0; i < options.num_deny_users; i++) |
762715ce | 184 | if (match_user(pw->pw_name, hostname, ipaddr, |
b334badd | 185 | options.deny_users[i])) { |
bbe88b6d | 186 | logit("User %.100s not allowed because listed in DenyUsers", |
762715ce | 187 | pw->pw_name); |
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) { |
bbe88b6d | 199 | logit("User %.100s not allowed because not listed in AllowUsers", |
b334badd | 200 | pw->pw_name); |
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) { |
bbe88b6d | 207 | logit("User %.100s not allowed because not in any group", |
b334badd | 208 | pw->pw_name); |
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(); | |
bbe88b6d | 217 | logit("User %.100s not allowed because a group is listed in DenyGroups", |
b334badd | 218 | pw->pw_name); |
7368a6c8 | 219 | return 0; |
c6a69271 | 220 | } |
7368a6c8 | 221 | /* |
c6a69271 | 222 | * Return false if AllowGroups isn't empty and one of user's groups |
7368a6c8 | 223 | * isn't listed there |
224 | */ | |
c6a69271 | 225 | if (options.num_allow_groups > 0) |
226 | if (!ga_match(options.allow_groups, | |
227 | options.num_allow_groups)) { | |
228 | ga_free(); | |
bbe88b6d | 229 | logit("User %.100s not allowed because none of user's groups are listed in AllowGroups", |
b334badd | 230 | pw->pw_name); |
7368a6c8 | 231 | return 0; |
c6a69271 | 232 | } |
233 | ga_free(); | |
7368a6c8 | 234 | } |
235 | ||
236 | #ifdef WITH_AIXAUTHENTICATE | |
f3e87063 | 237 | /* |
238 | * Don't check loginrestrictions() for root account (use | |
239 | * PermitRootLogin to control logins via ssh), or if running as | |
240 | * non-root user (since loginrestrictions will always fail). | |
241 | */ | |
bc7dfc06 | 242 | if ((pw->pw_uid != 0) && (geteuid() == 0)) { |
243 | char *msg; | |
244 | ||
245 | if (loginrestrictions(pw->pw_name, S_RLOGIN, NULL, &msg) != 0) { | |
246 | int loginrestrict_errno = errno; | |
247 | ||
248 | if (msg && *msg) { | |
249 | buffer_append(&loginmsg, msg, strlen(msg)); | |
250 | aix_remove_embedded_newlines(msg); | |
251 | logit("Login restricted for %s: %.100s", | |
252 | pw->pw_name, msg); | |
5daf7064 | 253 | } |
bc7dfc06 | 254 | /* Don't fail if /etc/nologin set */ |
255 | if (!(loginrestrict_errno == EPERM && | |
256 | stat(_PATH_NOLOGIN, &st) == 0)) | |
257 | return 0; | |
c1ef8333 | 258 | } |
c1ef8333 | 259 | } |
7368a6c8 | 260 | #endif /* WITH_AIXAUTHENTICATE */ |
261 | ||
262 | /* We found no reason not to let this user try to log on... */ | |
263 | return 1; | |
264 | } | |
59c97189 | 265 | |
266 | Authctxt * | |
267 | authctxt_new(void) | |
268 | { | |
2b87da3b | 269 | Authctxt *authctxt = xmalloc(sizeof(*authctxt)); |
270 | memset(authctxt, 0, sizeof(*authctxt)); | |
271 | return authctxt; | |
59c97189 | 272 | } |
273 | ||
59c97189 | 274 | void |
275 | auth_log(Authctxt *authctxt, int authenticated, char *method, char *info) | |
276 | { | |
277 | void (*authlog) (const char *fmt,...) = verbose; | |
278 | char *authmsg; | |
279 | ||
280 | /* Raise logging level */ | |
281 | if (authenticated == 1 || | |
282 | !authctxt->valid || | |
283 | authctxt->failures >= AUTH_FAIL_LOG || | |
284 | strcmp(method, "password") == 0) | |
a3568201 | 285 | authlog = logit; |
59c97189 | 286 | |
287 | if (authctxt->postponed) | |
288 | authmsg = "Postponed"; | |
289 | else | |
290 | authmsg = authenticated ? "Accepted" : "Failed"; | |
291 | ||
292 | authlog("%s %s for %s%.100s from %.200s port %d%s", | |
293 | authmsg, | |
294 | method, | |
295 | authctxt->valid ? "" : "illegal user ", | |
fad3754c | 296 | authctxt->user, |
59c97189 | 297 | get_remote_ipaddr(), |
298 | get_remote_port(), | |
299 | info); | |
56fd97d7 | 300 | |
73d9dad3 | 301 | #ifdef CUSTOM_FAILED_LOGIN |
56fd97d7 | 302 | if (authenticated == 0 && strcmp(method, "password") == 0) |
73d9dad3 | 303 | record_failed_login(authctxt->user, "ssh"); |
304 | #endif | |
59c97189 | 305 | } |
306 | ||
307 | /* | |
15853e93 | 308 | * Check whether root logins are disallowed. |
59c97189 | 309 | */ |
310 | int | |
15853e93 | 311 | auth_root_allowed(char *method) |
59c97189 | 312 | { |
15853e93 | 313 | switch (options.permit_root_login) { |
314 | case PERMIT_YES: | |
59c97189 | 315 | return 1; |
15853e93 | 316 | break; |
317 | case PERMIT_NO_PASSWD: | |
318 | if (strcmp(method, "password") != 0) | |
319 | return 1; | |
320 | break; | |
321 | case PERMIT_FORCED_ONLY: | |
322 | if (forced_command) { | |
bbe88b6d | 323 | logit("Root login accepted for forced command."); |
15853e93 | 324 | return 1; |
325 | } | |
326 | break; | |
59c97189 | 327 | } |
bbe88b6d | 328 | logit("ROOT LOGIN REFUSED FROM %.200s", get_remote_ipaddr()); |
15853e93 | 329 | return 0; |
59c97189 | 330 | } |
c8445989 | 331 | |
332 | ||
333 | /* | |
334 | * Given a template and a passwd structure, build a filename | |
335 | * by substituting % tokenised options. Currently, %% becomes '%', | |
336 | * %h becomes the home directory and %u the username. | |
337 | * | |
338 | * This returns a buffer allocated by xmalloc. | |
339 | */ | |
340 | char * | |
341 | expand_filename(const char *filename, struct passwd *pw) | |
342 | { | |
343 | Buffer buffer; | |
344 | char *file; | |
345 | const char *cp; | |
346 | ||
347 | /* | |
348 | * Build the filename string in the buffer by making the appropriate | |
349 | * substitutions to the given file name. | |
350 | */ | |
351 | buffer_init(&buffer); | |
352 | for (cp = filename; *cp; cp++) { | |
353 | if (cp[0] == '%' && cp[1] == '%') { | |
354 | buffer_append(&buffer, "%", 1); | |
355 | cp++; | |
356 | continue; | |
357 | } | |
358 | if (cp[0] == '%' && cp[1] == 'h') { | |
359 | buffer_append(&buffer, pw->pw_dir, strlen(pw->pw_dir)); | |
360 | cp++; | |
361 | continue; | |
362 | } | |
363 | if (cp[0] == '%' && cp[1] == 'u') { | |
364 | buffer_append(&buffer, pw->pw_name, | |
184eed6a | 365 | strlen(pw->pw_name)); |
c8445989 | 366 | cp++; |
367 | continue; | |
368 | } | |
369 | buffer_append(&buffer, cp, 1); | |
370 | } | |
371 | buffer_append(&buffer, "\0", 1); | |
372 | ||
373 | /* | |
374 | * Ensure that filename starts anchored. If not, be backward | |
375 | * compatible and prepend the '%h/' | |
376 | */ | |
377 | file = xmalloc(MAXPATHLEN); | |
378 | cp = buffer_ptr(&buffer); | |
379 | if (*cp != '/') | |
380 | snprintf(file, MAXPATHLEN, "%s/%s", pw->pw_dir, cp); | |
381 | else | |
382 | strlcpy(file, cp, MAXPATHLEN); | |
383 | ||
384 | buffer_free(&buffer); | |
385 | return file; | |
386 | } | |
387 | ||
388 | char * | |
389 | authorized_keys_file(struct passwd *pw) | |
390 | { | |
391 | return expand_filename(options.authorized_keys_file, pw); | |
392 | } | |
393 | ||
394 | char * | |
395 | authorized_keys_file2(struct passwd *pw) | |
396 | { | |
397 | return expand_filename(options.authorized_keys_file2, pw); | |
398 | } | |
399 | ||
d0c8ca5c | 400 | /* return ok if key exists in sysfile or userfile */ |
401 | HostStatus | |
402 | check_key_in_hostfiles(struct passwd *pw, Key *key, const char *host, | |
403 | const char *sysfile, const char *userfile) | |
404 | { | |
405 | Key *found; | |
406 | char *user_hostfile; | |
407 | struct stat st; | |
17a3011c | 408 | HostStatus host_status; |
d0c8ca5c | 409 | |
410 | /* Check if we know the host and its host key. */ | |
411 | found = key_new(key->type); | |
412 | host_status = check_host_in_hostfile(sysfile, host, key, found, NULL); | |
413 | ||
414 | if (host_status != HOST_OK && userfile != NULL) { | |
415 | user_hostfile = tilde_expand_filename(userfile, pw->pw_uid); | |
416 | if (options.strict_modes && | |
417 | (stat(user_hostfile, &st) == 0) && | |
418 | ((st.st_uid != 0 && st.st_uid != pw->pw_uid) || | |
184eed6a | 419 | (st.st_mode & 022) != 0)) { |
bbe88b6d | 420 | logit("Authentication refused for %.100s: " |
d0c8ca5c | 421 | "bad owner or modes for %.200s", |
422 | pw->pw_name, user_hostfile); | |
423 | } else { | |
424 | temporarily_use_uid(pw); | |
425 | host_status = check_host_in_hostfile(user_hostfile, | |
426 | host, key, found, NULL); | |
427 | restore_uid(); | |
428 | } | |
429 | xfree(user_hostfile); | |
430 | } | |
431 | key_free(found); | |
432 | ||
433 | debug2("check_key_in_hostfiles: key %s for %s", host_status == HOST_OK ? | |
434 | "ok" : "not found", host); | |
435 | return host_status; | |
436 | } | |
437 | ||
438 | ||
c8445989 | 439 | /* |
440 | * Check a given file for security. This is defined as all components | |
d6097023 | 441 | * of the path to the file must be owned by either the owner of |
1ddf764b | 442 | * of the file or root and no directories must be group or world writable. |
c8445989 | 443 | * |
444 | * XXX Should any specific check be done for sym links ? | |
445 | * | |
446 | * Takes an open file descriptor, the file name, a uid and and | |
447 | * error buffer plus max size as arguments. | |
448 | * | |
449 | * Returns 0 on success and -1 on failure | |
450 | */ | |
451 | int | |
6978866a | 452 | secure_filename(FILE *f, const char *file, struct passwd *pw, |
453 | char *err, size_t errlen) | |
c8445989 | 454 | { |
6978866a | 455 | uid_t uid = pw->pw_uid; |
76fbdd47 | 456 | char buf[MAXPATHLEN], homedir[MAXPATHLEN]; |
c8445989 | 457 | char *cp; |
f6f02456 | 458 | int comparehome = 0; |
c8445989 | 459 | struct stat st; |
460 | ||
461 | if (realpath(file, buf) == NULL) { | |
462 | snprintf(err, errlen, "realpath %s failed: %s", file, | |
463 | strerror(errno)); | |
464 | return -1; | |
465 | } | |
f6f02456 | 466 | if (realpath(pw->pw_dir, homedir) != NULL) |
467 | comparehome = 1; | |
c8445989 | 468 | |
469 | /* check the open file to avoid races */ | |
470 | if (fstat(fileno(f), &st) < 0 || | |
471 | (st.st_uid != 0 && st.st_uid != uid) || | |
472 | (st.st_mode & 022) != 0) { | |
473 | snprintf(err, errlen, "bad ownership or modes for file %s", | |
474 | buf); | |
475 | return -1; | |
476 | } | |
477 | ||
478 | /* for each component of the canonical path, walking upwards */ | |
479 | for (;;) { | |
480 | if ((cp = dirname(buf)) == NULL) { | |
481 | snprintf(err, errlen, "dirname() failed"); | |
482 | return -1; | |
483 | } | |
484 | strlcpy(buf, cp, sizeof(buf)); | |
485 | ||
486 | debug3("secure_filename: checking '%s'", buf); | |
487 | if (stat(buf, &st) < 0 || | |
488 | (st.st_uid != 0 && st.st_uid != uid) || | |
489 | (st.st_mode & 022) != 0) { | |
184eed6a | 490 | snprintf(err, errlen, |
c8445989 | 491 | "bad ownership or modes for directory %s", buf); |
492 | return -1; | |
493 | } | |
494 | ||
afd501f9 | 495 | /* If are passed the homedir then we can stop */ |
f6f02456 | 496 | if (comparehome && strcmp(homedir, buf) == 0) { |
afd501f9 | 497 | debug3("secure_filename: terminating check at '%s'", |
498 | buf); | |
499 | break; | |
500 | } | |
c8445989 | 501 | /* |
502 | * dirname should always complete with a "/" path, | |
503 | * but we can be paranoid and check for "." too | |
504 | */ | |
505 | if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) | |
506 | break; | |
507 | } | |
508 | return 0; | |
509 | } | |
443fa1cd | 510 | |
511 | struct passwd * | |
512 | getpwnamallow(const char *user) | |
513 | { | |
1836f69f | 514 | #ifdef HAVE_LOGIN_CAP |
515 | extern login_cap_t *lc; | |
516 | #ifdef BSD_AUTH | |
517 | auth_session_t *as; | |
518 | #endif | |
519 | #endif | |
443fa1cd | 520 | struct passwd *pw; |
521 | ||
522 | pw = getpwnam(user); | |
c2802d92 | 523 | if (pw == NULL) { |
bbe88b6d | 524 | logit("Illegal user %.100s from %.100s", |
c2802d92 | 525 | user, get_remote_ipaddr()); |
73d9dad3 | 526 | #ifdef CUSTOM_FAILED_LOGIN |
527 | record_failed_login(user, "ssh"); | |
819d3f09 | 528 | #endif |
c2802d92 | 529 | return (NULL); |
530 | } | |
531 | if (!allowed_user(pw)) | |
1836f69f | 532 | return (NULL); |
533 | #ifdef HAVE_LOGIN_CAP | |
534 | if ((lc = login_getclass(pw->pw_class)) == NULL) { | |
535 | debug("unable to get login class: %s", user); | |
536 | return (NULL); | |
537 | } | |
538 | #ifdef BSD_AUTH | |
539 | if ((as = auth_open()) == NULL || auth_setpwd(as, pw) != 0 || | |
65721f9c | 540 | auth_approval(as, lc, pw->pw_name, "ssh") <= 0) { |
1836f69f | 541 | debug("Approval failure for %s", user); |
443fa1cd | 542 | pw = NULL; |
1836f69f | 543 | } |
544 | if (as != NULL) | |
545 | auth_close(as); | |
546 | #endif | |
547 | #endif | |
06bea668 | 548 | if (pw != NULL) |
549 | return (pwcopy(pw)); | |
550 | return (NULL); | |
443fa1cd | 551 | } |
01dafcb5 | 552 | |
553 | void | |
554 | auth_debug_add(const char *fmt,...) | |
555 | { | |
556 | char buf[1024]; | |
557 | va_list args; | |
558 | ||
559 | if (!auth_debug_init) | |
560 | return; | |
561 | ||
562 | va_start(args, fmt); | |
563 | vsnprintf(buf, sizeof(buf), fmt, args); | |
564 | va_end(args); | |
565 | buffer_put_cstring(&auth_debug, buf); | |
566 | } | |
567 | ||
568 | void | |
569 | auth_debug_send(void) | |
570 | { | |
571 | char *msg; | |
572 | ||
573 | if (!auth_debug_init) | |
574 | return; | |
575 | while (buffer_len(&auth_debug)) { | |
576 | msg = buffer_get_string(&auth_debug, NULL); | |
577 | packet_send_debug("%s", msg); | |
578 | xfree(msg); | |
579 | } | |
580 | } | |
581 | ||
582 | void | |
583 | auth_debug_reset(void) | |
584 | { | |
585 | if (auth_debug_init) | |
586 | buffer_clear(&auth_debug); | |
587 | else { | |
588 | buffer_init(&auth_debug); | |
589 | auth_debug_init = 1; | |
590 | } | |
591 | } |