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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" | |
aff51935 | 26 | RCSID("$OpenBSD: auth.c,v 1.51 2003/11/21 11:57:02 djm 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) { |
11d40248 | 93 | int disabled = 0; |
3e6e3da0 | 94 | time_t today; |
95 | ||
5ed5468f | 96 | today = time(NULL) / DAY; |
97 | debug3("allowed_user: today %d sp_expire %d sp_lstchg %d" | |
98 | " sp_max %d", (int)today, (int)spw->sp_expire, | |
99 | (int)spw->sp_lstchg, (int)spw->sp_max); | |
b57c8e20 | 100 | |
5ed5468f | 101 | /* |
102 | * We assume account and password expiration occurs the | |
103 | * day after the day specified. | |
104 | */ | |
105 | if (spw->sp_expire != -1 && today > spw->sp_expire) { | |
bbe88b6d | 106 | logit("Account %.100s has expired", pw->pw_name); |
5ed5468f | 107 | return 0; |
108 | } | |
b57c8e20 | 109 | |
11d40248 | 110 | #if defined(__hpux) && !defined(HAVE_SECUREWARE) |
111 | if (iscomsec() && spw->sp_min == 0 && spw->sp_max == 0 && | |
112 | spw->sp_warn == 0) | |
113 | disabled = 1; /* Trusted Mode: expiry disabled */ | |
114 | #endif | |
115 | ||
116 | if (!disabled && spw->sp_lstchg == 0) { | |
bbe88b6d | 117 | logit("User %.100s password has expired (root forced)", |
5ed5468f | 118 | pw->pw_name); |
119 | return 0; | |
120 | } | |
b57c8e20 | 121 | |
11d40248 | 122 | if (!disabled && spw->sp_max != -1 && |
5ed5468f | 123 | today > spw->sp_lstchg + spw->sp_max) { |
bbe88b6d | 124 | logit("User %.100s password has expired (password aged)", |
5ed5468f | 125 | pw->pw_name); |
126 | return 0; | |
127 | } | |
b57c8e20 | 128 | } |
3e6e3da0 | 129 | #endif /* HAS_SHADOW_EXPIRE */ |
130 | #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ | |
131 | ||
aff51935 | 132 | /* grab passwd field for locked account check */ |
3e6e3da0 | 133 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) |
134 | if (spw != NULL) | |
135 | passwd = spw->sp_pwdp; | |
136 | #else | |
137 | passwd = pw->pw_passwd; | |
b57c8e20 | 138 | #endif |
139 | ||
aff51935 | 140 | /* check for locked account */ |
da67ae18 | 141 | if (!options.use_pam && passwd && *passwd) { |
3e6e3da0 | 142 | int locked = 0; |
143 | ||
144 | #ifdef LOCKED_PASSWD_STRING | |
145 | if (strcmp(passwd, LOCKED_PASSWD_STRING) == 0) | |
146 | locked = 1; | |
147 | #endif | |
148 | #ifdef LOCKED_PASSWD_PREFIX | |
149 | if (strncmp(passwd, LOCKED_PASSWD_PREFIX, | |
150 | strlen(LOCKED_PASSWD_PREFIX)) == 0) | |
151 | locked = 1; | |
152 | #endif | |
153 | #ifdef LOCKED_PASSWD_SUBSTR | |
154 | if (strstr(passwd, LOCKED_PASSWD_SUBSTR)) | |
155 | locked = 1; | |
156 | #endif | |
157 | if (locked) { | |
158 | logit("User %.100s not allowed because account is locked", | |
159 | pw->pw_name); | |
160 | return 0; | |
161 | } | |
162 | } | |
163 | ||
301e9b01 | 164 | /* |
165 | * Get the shell from the password data. An empty shell field is | |
166 | * legal, and means /bin/sh. | |
167 | */ | |
168 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
169 | ||
170 | /* deny if shell does not exists or is not executable */ | |
b334badd | 171 | if (stat(shell, &st) != 0) { |
bbe88b6d | 172 | logit("User %.100s not allowed because shell %.100s does not exist", |
b334badd | 173 | pw->pw_name, shell); |
7368a6c8 | 174 | return 0; |
b334badd | 175 | } |
c390a3c8 | 176 | if (S_ISREG(st.st_mode) == 0 || |
177 | (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)) == 0) { | |
bbe88b6d | 178 | logit("User %.100s not allowed because shell %.100s is not executable", |
b334badd | 179 | pw->pw_name, shell); |
7368a6c8 | 180 | return 0; |
b334badd | 181 | } |
7368a6c8 | 182 | |
6805fc56 | 183 | if (options.num_deny_users > 0 || options.num_allow_users > 0) { |
c5a7d788 | 184 | hostname = get_canonical_hostname(options.use_dns); |
6805fc56 | 185 | ipaddr = get_remote_ipaddr(); |
186 | } | |
187 | ||
7368a6c8 | 188 | /* Return false if user is listed in DenyUsers */ |
189 | if (options.num_deny_users > 0) { | |
7368a6c8 | 190 | for (i = 0; i < options.num_deny_users; i++) |
762715ce | 191 | if (match_user(pw->pw_name, hostname, ipaddr, |
b334badd | 192 | options.deny_users[i])) { |
bbe88b6d | 193 | logit("User %.100s not allowed because listed in DenyUsers", |
762715ce | 194 | pw->pw_name); |
7368a6c8 | 195 | return 0; |
b334badd | 196 | } |
7368a6c8 | 197 | } |
198 | /* Return false if AllowUsers isn't empty and user isn't listed there */ | |
199 | if (options.num_allow_users > 0) { | |
7368a6c8 | 200 | for (i = 0; i < options.num_allow_users; i++) |
762715ce | 201 | if (match_user(pw->pw_name, hostname, ipaddr, |
80f8f24f | 202 | options.allow_users[i])) |
7368a6c8 | 203 | break; |
204 | /* i < options.num_allow_users iff we break for loop */ | |
b334badd | 205 | if (i >= options.num_allow_users) { |
bbe88b6d | 206 | logit("User %.100s not allowed because not listed in AllowUsers", |
b334badd | 207 | pw->pw_name); |
7368a6c8 | 208 | return 0; |
b334badd | 209 | } |
7368a6c8 | 210 | } |
7368a6c8 | 211 | if (options.num_deny_groups > 0 || options.num_allow_groups > 0) { |
c6a69271 | 212 | /* Get the user's group access list (primary and supplementary) */ |
b334badd | 213 | if (ga_init(pw->pw_name, pw->pw_gid) == 0) { |
bbe88b6d | 214 | logit("User %.100s not allowed because not in any group", |
b334badd | 215 | pw->pw_name); |
7368a6c8 | 216 | return 0; |
b334badd | 217 | } |
7368a6c8 | 218 | |
c6a69271 | 219 | /* Return false if one of user's groups is listed in DenyGroups */ |
220 | if (options.num_deny_groups > 0) | |
221 | if (ga_match(options.deny_groups, | |
222 | options.num_deny_groups)) { | |
223 | ga_free(); | |
bbe88b6d | 224 | logit("User %.100s not allowed because a group is listed in DenyGroups", |
b334badd | 225 | pw->pw_name); |
7368a6c8 | 226 | return 0; |
c6a69271 | 227 | } |
7368a6c8 | 228 | /* |
c6a69271 | 229 | * Return false if AllowGroups isn't empty and one of user's groups |
7368a6c8 | 230 | * isn't listed there |
231 | */ | |
c6a69271 | 232 | if (options.num_allow_groups > 0) |
233 | if (!ga_match(options.allow_groups, | |
234 | options.num_allow_groups)) { | |
235 | ga_free(); | |
bbe88b6d | 236 | logit("User %.100s not allowed because none of user's groups are listed in AllowGroups", |
b334badd | 237 | pw->pw_name); |
7368a6c8 | 238 | return 0; |
c6a69271 | 239 | } |
240 | ga_free(); | |
7368a6c8 | 241 | } |
242 | ||
243 | #ifdef WITH_AIXAUTHENTICATE | |
f3e87063 | 244 | /* |
245 | * Don't check loginrestrictions() for root account (use | |
246 | * PermitRootLogin to control logins via ssh), or if running as | |
247 | * non-root user (since loginrestrictions will always fail). | |
248 | */ | |
bc7dfc06 | 249 | if ((pw->pw_uid != 0) && (geteuid() == 0)) { |
250 | char *msg; | |
251 | ||
aff51935 | 252 | if (loginrestrictions(pw->pw_name, S_RLOGIN, NULL, &msg) != 0) { |
bc7dfc06 | 253 | int loginrestrict_errno = errno; |
254 | ||
255 | if (msg && *msg) { | |
256 | buffer_append(&loginmsg, msg, strlen(msg)); | |
257 | aix_remove_embedded_newlines(msg); | |
258 | logit("Login restricted for %s: %.100s", | |
259 | pw->pw_name, msg); | |
5daf7064 | 260 | } |
bc7dfc06 | 261 | /* Don't fail if /etc/nologin set */ |
aff51935 | 262 | if (!(loginrestrict_errno == EPERM && |
bc7dfc06 | 263 | stat(_PATH_NOLOGIN, &st) == 0)) |
264 | return 0; | |
c1ef8333 | 265 | } |
c1ef8333 | 266 | } |
7368a6c8 | 267 | #endif /* WITH_AIXAUTHENTICATE */ |
268 | ||
269 | /* We found no reason not to let this user try to log on... */ | |
270 | return 1; | |
271 | } | |
59c97189 | 272 | |
59c97189 | 273 | void |
274 | auth_log(Authctxt *authctxt, int authenticated, char *method, char *info) | |
275 | { | |
276 | void (*authlog) (const char *fmt,...) = verbose; | |
277 | char *authmsg; | |
278 | ||
279 | /* Raise logging level */ | |
280 | if (authenticated == 1 || | |
281 | !authctxt->valid || | |
282 | authctxt->failures >= AUTH_FAIL_LOG || | |
283 | strcmp(method, "password") == 0) | |
a3568201 | 284 | authlog = logit; |
59c97189 | 285 | |
286 | if (authctxt->postponed) | |
287 | authmsg = "Postponed"; | |
288 | else | |
289 | authmsg = authenticated ? "Accepted" : "Failed"; | |
290 | ||
291 | authlog("%s %s for %s%.100s from %.200s port %d%s", | |
292 | authmsg, | |
293 | method, | |
294 | authctxt->valid ? "" : "illegal user ", | |
fad3754c | 295 | authctxt->user, |
59c97189 | 296 | get_remote_ipaddr(), |
297 | get_remote_port(), | |
298 | info); | |
56fd97d7 | 299 | |
73d9dad3 | 300 | #ifdef CUSTOM_FAILED_LOGIN |
56fd97d7 | 301 | if (authenticated == 0 && strcmp(method, "password") == 0) |
73d9dad3 | 302 | record_failed_login(authctxt->user, "ssh"); |
303 | #endif | |
59c97189 | 304 | } |
305 | ||
306 | /* | |
15853e93 | 307 | * Check whether root logins are disallowed. |
59c97189 | 308 | */ |
309 | int | |
15853e93 | 310 | auth_root_allowed(char *method) |
59c97189 | 311 | { |
15853e93 | 312 | switch (options.permit_root_login) { |
313 | case PERMIT_YES: | |
59c97189 | 314 | return 1; |
15853e93 | 315 | break; |
316 | case PERMIT_NO_PASSWD: | |
317 | if (strcmp(method, "password") != 0) | |
318 | return 1; | |
319 | break; | |
320 | case PERMIT_FORCED_ONLY: | |
321 | if (forced_command) { | |
bbe88b6d | 322 | logit("Root login accepted for forced command."); |
15853e93 | 323 | return 1; |
324 | } | |
325 | break; | |
59c97189 | 326 | } |
bbe88b6d | 327 | logit("ROOT LOGIN REFUSED FROM %.200s", get_remote_ipaddr()); |
15853e93 | 328 | return 0; |
59c97189 | 329 | } |
c8445989 | 330 | |
331 | ||
332 | /* | |
333 | * Given a template and a passwd structure, build a filename | |
334 | * by substituting % tokenised options. Currently, %% becomes '%', | |
335 | * %h becomes the home directory and %u the username. | |
336 | * | |
337 | * This returns a buffer allocated by xmalloc. | |
338 | */ | |
339 | char * | |
340 | expand_filename(const char *filename, struct passwd *pw) | |
341 | { | |
342 | Buffer buffer; | |
343 | char *file; | |
344 | const char *cp; | |
345 | ||
346 | /* | |
347 | * Build the filename string in the buffer by making the appropriate | |
348 | * substitutions to the given file name. | |
349 | */ | |
350 | buffer_init(&buffer); | |
351 | for (cp = filename; *cp; cp++) { | |
352 | if (cp[0] == '%' && cp[1] == '%') { | |
353 | buffer_append(&buffer, "%", 1); | |
354 | cp++; | |
355 | continue; | |
356 | } | |
357 | if (cp[0] == '%' && cp[1] == 'h') { | |
358 | buffer_append(&buffer, pw->pw_dir, strlen(pw->pw_dir)); | |
359 | cp++; | |
360 | continue; | |
361 | } | |
362 | if (cp[0] == '%' && cp[1] == 'u') { | |
363 | buffer_append(&buffer, pw->pw_name, | |
184eed6a | 364 | strlen(pw->pw_name)); |
c8445989 | 365 | cp++; |
366 | continue; | |
367 | } | |
368 | buffer_append(&buffer, cp, 1); | |
369 | } | |
370 | buffer_append(&buffer, "\0", 1); | |
371 | ||
372 | /* | |
373 | * Ensure that filename starts anchored. If not, be backward | |
374 | * compatible and prepend the '%h/' | |
375 | */ | |
376 | file = xmalloc(MAXPATHLEN); | |
377 | cp = buffer_ptr(&buffer); | |
378 | if (*cp != '/') | |
379 | snprintf(file, MAXPATHLEN, "%s/%s", pw->pw_dir, cp); | |
380 | else | |
381 | strlcpy(file, cp, MAXPATHLEN); | |
382 | ||
383 | buffer_free(&buffer); | |
384 | return file; | |
385 | } | |
386 | ||
387 | char * | |
388 | authorized_keys_file(struct passwd *pw) | |
389 | { | |
390 | return expand_filename(options.authorized_keys_file, pw); | |
391 | } | |
392 | ||
393 | char * | |
394 | authorized_keys_file2(struct passwd *pw) | |
395 | { | |
396 | return expand_filename(options.authorized_keys_file2, pw); | |
397 | } | |
398 | ||
d0c8ca5c | 399 | /* return ok if key exists in sysfile or userfile */ |
400 | HostStatus | |
401 | check_key_in_hostfiles(struct passwd *pw, Key *key, const char *host, | |
402 | const char *sysfile, const char *userfile) | |
403 | { | |
404 | Key *found; | |
405 | char *user_hostfile; | |
406 | struct stat st; | |
17a3011c | 407 | HostStatus host_status; |
d0c8ca5c | 408 | |
409 | /* Check if we know the host and its host key. */ | |
410 | found = key_new(key->type); | |
411 | host_status = check_host_in_hostfile(sysfile, host, key, found, NULL); | |
412 | ||
413 | if (host_status != HOST_OK && userfile != NULL) { | |
414 | user_hostfile = tilde_expand_filename(userfile, pw->pw_uid); | |
415 | if (options.strict_modes && | |
416 | (stat(user_hostfile, &st) == 0) && | |
417 | ((st.st_uid != 0 && st.st_uid != pw->pw_uid) || | |
184eed6a | 418 | (st.st_mode & 022) != 0)) { |
bbe88b6d | 419 | logit("Authentication refused for %.100s: " |
d0c8ca5c | 420 | "bad owner or modes for %.200s", |
421 | pw->pw_name, user_hostfile); | |
422 | } else { | |
423 | temporarily_use_uid(pw); | |
424 | host_status = check_host_in_hostfile(user_hostfile, | |
425 | host, key, found, NULL); | |
426 | restore_uid(); | |
427 | } | |
428 | xfree(user_hostfile); | |
429 | } | |
430 | key_free(found); | |
431 | ||
432 | debug2("check_key_in_hostfiles: key %s for %s", host_status == HOST_OK ? | |
433 | "ok" : "not found", host); | |
434 | return host_status; | |
435 | } | |
436 | ||
437 | ||
c8445989 | 438 | /* |
439 | * Check a given file for security. This is defined as all components | |
d6097023 | 440 | * of the path to the file must be owned by either the owner of |
1ddf764b | 441 | * of the file or root and no directories must be group or world writable. |
c8445989 | 442 | * |
443 | * XXX Should any specific check be done for sym links ? | |
444 | * | |
445 | * Takes an open file descriptor, the file name, a uid and and | |
446 | * error buffer plus max size as arguments. | |
447 | * | |
448 | * Returns 0 on success and -1 on failure | |
449 | */ | |
450 | int | |
6978866a | 451 | secure_filename(FILE *f, const char *file, struct passwd *pw, |
452 | char *err, size_t errlen) | |
c8445989 | 453 | { |
6978866a | 454 | uid_t uid = pw->pw_uid; |
76fbdd47 | 455 | char buf[MAXPATHLEN], homedir[MAXPATHLEN]; |
c8445989 | 456 | char *cp; |
f6f02456 | 457 | int comparehome = 0; |
c8445989 | 458 | struct stat st; |
459 | ||
460 | if (realpath(file, buf) == NULL) { | |
461 | snprintf(err, errlen, "realpath %s failed: %s", file, | |
462 | strerror(errno)); | |
463 | return -1; | |
464 | } | |
f6f02456 | 465 | if (realpath(pw->pw_dir, homedir) != NULL) |
466 | comparehome = 1; | |
c8445989 | 467 | |
468 | /* check the open file to avoid races */ | |
469 | if (fstat(fileno(f), &st) < 0 || | |
470 | (st.st_uid != 0 && st.st_uid != uid) || | |
471 | (st.st_mode & 022) != 0) { | |
472 | snprintf(err, errlen, "bad ownership or modes for file %s", | |
473 | buf); | |
474 | return -1; | |
475 | } | |
476 | ||
477 | /* for each component of the canonical path, walking upwards */ | |
478 | for (;;) { | |
479 | if ((cp = dirname(buf)) == NULL) { | |
480 | snprintf(err, errlen, "dirname() failed"); | |
481 | return -1; | |
482 | } | |
483 | strlcpy(buf, cp, sizeof(buf)); | |
484 | ||
485 | debug3("secure_filename: checking '%s'", buf); | |
486 | if (stat(buf, &st) < 0 || | |
487 | (st.st_uid != 0 && st.st_uid != uid) || | |
488 | (st.st_mode & 022) != 0) { | |
184eed6a | 489 | snprintf(err, errlen, |
c8445989 | 490 | "bad ownership or modes for directory %s", buf); |
491 | return -1; | |
492 | } | |
493 | ||
afd501f9 | 494 | /* If are passed the homedir then we can stop */ |
f6f02456 | 495 | if (comparehome && strcmp(homedir, buf) == 0) { |
afd501f9 | 496 | debug3("secure_filename: terminating check at '%s'", |
497 | buf); | |
498 | break; | |
499 | } | |
c8445989 | 500 | /* |
501 | * dirname should always complete with a "/" path, | |
502 | * but we can be paranoid and check for "." too | |
503 | */ | |
504 | if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) | |
505 | break; | |
506 | } | |
507 | return 0; | |
508 | } | |
443fa1cd | 509 | |
510 | struct passwd * | |
511 | getpwnamallow(const char *user) | |
512 | { | |
1836f69f | 513 | #ifdef HAVE_LOGIN_CAP |
514 | extern login_cap_t *lc; | |
515 | #ifdef BSD_AUTH | |
516 | auth_session_t *as; | |
517 | #endif | |
518 | #endif | |
443fa1cd | 519 | struct passwd *pw; |
520 | ||
521 | pw = getpwnam(user); | |
c2802d92 | 522 | if (pw == NULL) { |
bbe88b6d | 523 | logit("Illegal user %.100s from %.100s", |
c2802d92 | 524 | user, get_remote_ipaddr()); |
73d9dad3 | 525 | #ifdef CUSTOM_FAILED_LOGIN |
526 | record_failed_login(user, "ssh"); | |
819d3f09 | 527 | #endif |
c2802d92 | 528 | return (NULL); |
529 | } | |
530 | if (!allowed_user(pw)) | |
1836f69f | 531 | return (NULL); |
532 | #ifdef HAVE_LOGIN_CAP | |
533 | if ((lc = login_getclass(pw->pw_class)) == NULL) { | |
534 | debug("unable to get login class: %s", user); | |
535 | return (NULL); | |
536 | } | |
537 | #ifdef BSD_AUTH | |
538 | if ((as = auth_open()) == NULL || auth_setpwd(as, pw) != 0 || | |
65721f9c | 539 | auth_approval(as, lc, pw->pw_name, "ssh") <= 0) { |
1836f69f | 540 | debug("Approval failure for %s", user); |
443fa1cd | 541 | pw = NULL; |
1836f69f | 542 | } |
543 | if (as != NULL) | |
544 | auth_close(as); | |
545 | #endif | |
546 | #endif | |
06bea668 | 547 | if (pw != NULL) |
548 | return (pwcopy(pw)); | |
549 | return (NULL); | |
443fa1cd | 550 | } |
01dafcb5 | 551 | |
552 | void | |
553 | auth_debug_add(const char *fmt,...) | |
554 | { | |
555 | char buf[1024]; | |
556 | va_list args; | |
557 | ||
558 | if (!auth_debug_init) | |
559 | return; | |
560 | ||
561 | va_start(args, fmt); | |
562 | vsnprintf(buf, sizeof(buf), fmt, args); | |
563 | va_end(args); | |
564 | buffer_put_cstring(&auth_debug, buf); | |
565 | } | |
566 | ||
567 | void | |
568 | auth_debug_send(void) | |
569 | { | |
570 | char *msg; | |
571 | ||
572 | if (!auth_debug_init) | |
573 | return; | |
574 | while (buffer_len(&auth_debug)) { | |
575 | msg = buffer_get_string(&auth_debug, NULL); | |
576 | packet_send_debug("%s", msg); | |
577 | xfree(msg); | |
578 | } | |
579 | } | |
580 | ||
581 | void | |
582 | auth_debug_reset(void) | |
583 | { | |
584 | if (auth_debug_init) | |
585 | buffer_clear(&auth_debug); | |
586 | else { | |
587 | buffer_init(&auth_debug); | |
588 | auth_debug_init = 1; | |
589 | } | |
590 | } | |
96d0bf74 | 591 | |
592 | struct passwd * | |
593 | fakepw(void) | |
594 | { | |
595 | static struct passwd fake; | |
596 | ||
597 | memset(&fake, 0, sizeof(fake)); | |
598 | fake.pw_name = "NOUSER"; | |
599 | fake.pw_passwd = | |
600 | "$2a$06$r3.juUaHZDlIbQaO2dS9FuYxL1W9M81R1Tc92PoSNmzvpEqLkLGrK"; | |
601 | fake.pw_gecos = "NOUSER"; | |
602 | fake.pw_uid = -1; | |
603 | fake.pw_gid = -1; | |
604 | #ifdef HAVE_PW_CLASS_IN_PASSWD | |
605 | fake.pw_class = ""; | |
606 | #endif | |
607 | fake.pw_dir = "/nonexist"; | |
608 | fake.pw_shell = "/nonexist"; | |
609 | ||
610 | return (&fake); | |
611 | } |