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a3d3770c | 1 | /* $OpenBSD: auth.c,v 1.78 2007/09/21 08:15:29 djm 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; |
a078cbee | 76 | extern struct passwd *privsep_pw; |
7368a6c8 | 77 | |
01dafcb5 | 78 | /* Debugging messages */ |
79 | Buffer auth_debug; | |
80 | int auth_debug_init; | |
81 | ||
7368a6c8 | 82 | /* |
c6a69271 | 83 | * Check if the user is allowed to log in via ssh. If user is listed |
84 | * in DenyUsers or one of user's groups is listed in DenyGroups, false | |
85 | * will be returned. If AllowUsers isn't empty and user isn't listed | |
86 | * there, or if AllowGroups isn't empty and one of user's groups isn't | |
87 | * listed there, false will be returned. | |
7368a6c8 | 88 | * If the user's shell is not executable, false will be returned. |
6ae2364d | 89 | * Otherwise true is returned. |
7368a6c8 | 90 | */ |
a306f2dd | 91 | int |
7368a6c8 | 92 | allowed_user(struct passwd * pw) |
93 | { | |
94 | struct stat st; | |
da67ae18 | 95 | const char *hostname = NULL, *ipaddr = NULL, *passwd = NULL; |
614dee3a | 96 | char *shell; |
2ceb8101 | 97 | u_int i; |
f14ca4a4 | 98 | #ifdef USE_SHADOW |
3e6e3da0 | 99 | struct spwd *spw = NULL; |
e2ef2342 | 100 | #endif |
7368a6c8 | 101 | |
102 | /* Shouldn't be called if pw is NULL, but better safe than sorry... */ | |
c6a69271 | 103 | if (!pw || !pw->pw_name) |
7368a6c8 | 104 | return 0; |
105 | ||
f14ca4a4 | 106 | #ifdef USE_SHADOW |
3e6e3da0 | 107 | if (!options.use_pam) |
108 | spw = getspnam(pw->pw_name); | |
109 | #ifdef HAS_SHADOW_EXPIRE | |
f14ca4a4 | 110 | if (!options.use_pam && spw != NULL && auth_shadow_acctexpired(spw)) |
111 | return 0; | |
3e6e3da0 | 112 | #endif /* HAS_SHADOW_EXPIRE */ |
f14ca4a4 | 113 | #endif /* USE_SHADOW */ |
3e6e3da0 | 114 | |
aff51935 | 115 | /* grab passwd field for locked account check */ |
f14ca4a4 | 116 | #ifdef USE_SHADOW |
3e6e3da0 | 117 | if (spw != NULL) |
a03acb8f | 118 | #ifdef USE_LIBIAF |
4c653d8e | 119 | passwd = get_iaf_password(pw); |
120 | #else | |
3e6e3da0 | 121 | passwd = spw->sp_pwdp; |
a03acb8f | 122 | #endif /* USE_LIBIAF */ |
3e6e3da0 | 123 | #else |
124 | passwd = pw->pw_passwd; | |
b57c8e20 | 125 | #endif |
126 | ||
aff51935 | 127 | /* check for locked account */ |
da67ae18 | 128 | if (!options.use_pam && passwd && *passwd) { |
3e6e3da0 | 129 | int locked = 0; |
130 | ||
131 | #ifdef LOCKED_PASSWD_STRING | |
132 | if (strcmp(passwd, LOCKED_PASSWD_STRING) == 0) | |
133 | locked = 1; | |
134 | #endif | |
135 | #ifdef LOCKED_PASSWD_PREFIX | |
136 | if (strncmp(passwd, LOCKED_PASSWD_PREFIX, | |
137 | strlen(LOCKED_PASSWD_PREFIX)) == 0) | |
138 | locked = 1; | |
139 | #endif | |
140 | #ifdef LOCKED_PASSWD_SUBSTR | |
141 | if (strstr(passwd, LOCKED_PASSWD_SUBSTR)) | |
142 | locked = 1; | |
143 | #endif | |
a03acb8f | 144 | #ifdef USE_LIBIAF |
26d07095 | 145 | free(passwd); |
a03acb8f | 146 | #endif /* USE_LIBIAF */ |
3e6e3da0 | 147 | if (locked) { |
148 | logit("User %.100s not allowed because account is locked", | |
149 | pw->pw_name); | |
150 | return 0; | |
151 | } | |
152 | } | |
153 | ||
301e9b01 | 154 | /* |
155 | * Get the shell from the password data. An empty shell field is | |
156 | * legal, and means /bin/sh. | |
157 | */ | |
158 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
159 | ||
160 | /* deny if shell does not exists or is not executable */ | |
b334badd | 161 | if (stat(shell, &st) != 0) { |
bbe88b6d | 162 | logit("User %.100s not allowed because shell %.100s does not exist", |
b334badd | 163 | pw->pw_name, shell); |
7368a6c8 | 164 | return 0; |
b334badd | 165 | } |
c390a3c8 | 166 | if (S_ISREG(st.st_mode) == 0 || |
167 | (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)) == 0) { | |
bbe88b6d | 168 | logit("User %.100s not allowed because shell %.100s is not executable", |
b334badd | 169 | pw->pw_name, shell); |
7368a6c8 | 170 | return 0; |
b334badd | 171 | } |
7368a6c8 | 172 | |
2dcbac07 | 173 | if (options.num_deny_users > 0 || options.num_allow_users > 0 || |
174 | options.num_deny_groups > 0 || options.num_allow_groups > 0) { | |
c5a7d788 | 175 | hostname = get_canonical_hostname(options.use_dns); |
6805fc56 | 176 | ipaddr = get_remote_ipaddr(); |
177 | } | |
178 | ||
7368a6c8 | 179 | /* Return false if user is listed in DenyUsers */ |
180 | if (options.num_deny_users > 0) { | |
7368a6c8 | 181 | for (i = 0; i < options.num_deny_users; i++) |
762715ce | 182 | if (match_user(pw->pw_name, hostname, ipaddr, |
b334badd | 183 | options.deny_users[i])) { |
31de8b2b | 184 | logit("User %.100s from %.100s not allowed " |
185 | "because listed in DenyUsers", | |
186 | pw->pw_name, hostname); | |
7368a6c8 | 187 | return 0; |
b334badd | 188 | } |
7368a6c8 | 189 | } |
190 | /* Return false if AllowUsers isn't empty and user isn't listed there */ | |
191 | if (options.num_allow_users > 0) { | |
7368a6c8 | 192 | for (i = 0; i < options.num_allow_users; i++) |
762715ce | 193 | if (match_user(pw->pw_name, hostname, ipaddr, |
80f8f24f | 194 | options.allow_users[i])) |
7368a6c8 | 195 | break; |
196 | /* i < options.num_allow_users iff we break for loop */ | |
b334badd | 197 | if (i >= options.num_allow_users) { |
31de8b2b | 198 | logit("User %.100s from %.100s not allowed because " |
199 | "not listed in AllowUsers", pw->pw_name, hostname); | |
7368a6c8 | 200 | return 0; |
b334badd | 201 | } |
7368a6c8 | 202 | } |
7368a6c8 | 203 | if (options.num_deny_groups > 0 || options.num_allow_groups > 0) { |
c6a69271 | 204 | /* Get the user's group access list (primary and supplementary) */ |
b334badd | 205 | if (ga_init(pw->pw_name, pw->pw_gid) == 0) { |
31de8b2b | 206 | logit("User %.100s from %.100s not allowed because " |
207 | "not in any group", pw->pw_name, hostname); | |
7368a6c8 | 208 | return 0; |
b334badd | 209 | } |
7368a6c8 | 210 | |
c6a69271 | 211 | /* Return false if one of user's groups is listed in DenyGroups */ |
212 | if (options.num_deny_groups > 0) | |
213 | if (ga_match(options.deny_groups, | |
214 | options.num_deny_groups)) { | |
215 | ga_free(); | |
31de8b2b | 216 | logit("User %.100s from %.100s not allowed " |
217 | "because a group is listed in DenyGroups", | |
218 | pw->pw_name, hostname); | |
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(); | |
31de8b2b | 229 | logit("User %.100s from %.100s not allowed " |
230 | "because none of user's groups are listed " | |
231 | "in AllowGroups", pw->pw_name, hostname); | |
7368a6c8 | 232 | return 0; |
c6a69271 | 233 | } |
234 | ga_free(); | |
7368a6c8 | 235 | } |
236 | ||
bc5c2025 | 237 | #ifdef CUSTOM_SYS_AUTH_ALLOWED_USER |
5ccf88cb | 238 | if (!sys_auth_allowed_user(pw, &loginmsg)) |
bc5c2025 | 239 | return 0; |
240 | #endif | |
7368a6c8 | 241 | |
242 | /* We found no reason not to let this user try to log on... */ | |
243 | return 1; | |
244 | } | |
59c97189 | 245 | |
59c97189 | 246 | void |
247 | auth_log(Authctxt *authctxt, int authenticated, char *method, char *info) | |
248 | { | |
249 | void (*authlog) (const char *fmt,...) = verbose; | |
250 | char *authmsg; | |
251 | ||
c023a130 | 252 | if (use_privsep && !mm_is_monitor() && !authctxt->postponed) |
253 | return; | |
254 | ||
59c97189 | 255 | /* Raise logging level */ |
256 | if (authenticated == 1 || | |
257 | !authctxt->valid || | |
af4bd935 | 258 | authctxt->failures >= options.max_authtries / 2 || |
59c97189 | 259 | strcmp(method, "password") == 0) |
a3568201 | 260 | authlog = logit; |
59c97189 | 261 | |
262 | if (authctxt->postponed) | |
263 | authmsg = "Postponed"; | |
264 | else | |
265 | authmsg = authenticated ? "Accepted" : "Failed"; | |
266 | ||
267 | authlog("%s %s for %s%.100s from %.200s port %d%s", | |
268 | authmsg, | |
269 | method, | |
d77347cc | 270 | authctxt->valid ? "" : "invalid user ", |
fad3754c | 271 | authctxt->user, |
59c97189 | 272 | get_remote_ipaddr(), |
273 | get_remote_port(), | |
274 | info); | |
56fd97d7 | 275 | |
73d9dad3 | 276 | #ifdef CUSTOM_FAILED_LOGIN |
b6610e8f | 277 | if (authenticated == 0 && !authctxt->postponed && |
278 | (strcmp(method, "password") == 0 || | |
6af6e631 | 279 | strncmp(method, "keyboard-interactive", 20) == 0 || |
280 | strcmp(method, "challenge-response") == 0)) | |
575e336f | 281 | record_failed_login(authctxt->user, |
282 | get_canonical_hostname(options.use_dns), "ssh"); | |
6545dd0b | 283 | # ifdef WITH_AIXAUTHENTICATE |
284 | if (authenticated) | |
285 | sys_auth_record_login(authctxt->user, | |
286 | get_canonical_hostname(options.use_dns), "ssh", &loginmsg); | |
287 | # endif | |
73d9dad3 | 288 | #endif |
6039eeef | 289 | #ifdef SSH_AUDIT_EVENTS |
2ae7f715 | 290 | if (authenticated == 0 && !authctxt->postponed) |
291 | audit_event(audit_classify_auth(method)); | |
c00e4d75 | 292 | #endif |
59c97189 | 293 | } |
294 | ||
295 | /* | |
15853e93 | 296 | * Check whether root logins are disallowed. |
59c97189 | 297 | */ |
298 | int | |
15853e93 | 299 | auth_root_allowed(char *method) |
59c97189 | 300 | { |
15853e93 | 301 | switch (options.permit_root_login) { |
302 | case PERMIT_YES: | |
59c97189 | 303 | return 1; |
15853e93 | 304 | case PERMIT_NO_PASSWD: |
305 | if (strcmp(method, "password") != 0) | |
306 | return 1; | |
307 | break; | |
308 | case PERMIT_FORCED_ONLY: | |
309 | if (forced_command) { | |
bbe88b6d | 310 | logit("Root login accepted for forced command."); |
15853e93 | 311 | return 1; |
312 | } | |
313 | break; | |
59c97189 | 314 | } |
bbe88b6d | 315 | logit("ROOT LOGIN REFUSED FROM %.200s", get_remote_ipaddr()); |
15853e93 | 316 | return 0; |
59c97189 | 317 | } |
c8445989 | 318 | |
319 | ||
320 | /* | |
321 | * Given a template and a passwd structure, build a filename | |
322 | * by substituting % tokenised options. Currently, %% becomes '%', | |
323 | * %h becomes the home directory and %u the username. | |
324 | * | |
325 | * This returns a buffer allocated by xmalloc. | |
326 | */ | |
a980cbd7 | 327 | static char * |
328 | expand_authorized_keys(const char *filename, struct passwd *pw) | |
c8445989 | 329 | { |
52e3daed | 330 | char *file, ret[MAXPATHLEN]; |
331 | int i; | |
c8445989 | 332 | |
a980cbd7 | 333 | file = percent_expand(filename, "h", pw->pw_dir, |
334 | "u", pw->pw_name, (char *)NULL); | |
c8445989 | 335 | |
336 | /* | |
337 | * Ensure that filename starts anchored. If not, be backward | |
338 | * compatible and prepend the '%h/' | |
339 | */ | |
a980cbd7 | 340 | if (*file == '/') |
341 | return (file); | |
342 | ||
52e3daed | 343 | i = snprintf(ret, sizeof(ret), "%s/%s", pw->pw_dir, file); |
344 | if (i < 0 || (size_t)i >= sizeof(ret)) | |
a980cbd7 | 345 | fatal("expand_authorized_keys: path too long"); |
a980cbd7 | 346 | xfree(file); |
52e3daed | 347 | return (xstrdup(ret)); |
c8445989 | 348 | } |
349 | ||
350 | char * | |
351 | authorized_keys_file(struct passwd *pw) | |
352 | { | |
a980cbd7 | 353 | return expand_authorized_keys(options.authorized_keys_file, pw); |
c8445989 | 354 | } |
355 | ||
356 | char * | |
357 | authorized_keys_file2(struct passwd *pw) | |
358 | { | |
a980cbd7 | 359 | return expand_authorized_keys(options.authorized_keys_file2, pw); |
c8445989 | 360 | } |
361 | ||
d0c8ca5c | 362 | /* return ok if key exists in sysfile or userfile */ |
363 | HostStatus | |
364 | check_key_in_hostfiles(struct passwd *pw, Key *key, const char *host, | |
365 | const char *sysfile, const char *userfile) | |
366 | { | |
367 | Key *found; | |
368 | char *user_hostfile; | |
369 | struct stat st; | |
17a3011c | 370 | HostStatus host_status; |
d0c8ca5c | 371 | |
372 | /* Check if we know the host and its host key. */ | |
373 | found = key_new(key->type); | |
374 | host_status = check_host_in_hostfile(sysfile, host, key, found, NULL); | |
375 | ||
376 | if (host_status != HOST_OK && userfile != NULL) { | |
377 | user_hostfile = tilde_expand_filename(userfile, pw->pw_uid); | |
378 | if (options.strict_modes && | |
379 | (stat(user_hostfile, &st) == 0) && | |
380 | ((st.st_uid != 0 && st.st_uid != pw->pw_uid) || | |
184eed6a | 381 | (st.st_mode & 022) != 0)) { |
bbe88b6d | 382 | logit("Authentication refused for %.100s: " |
d0c8ca5c | 383 | "bad owner or modes for %.200s", |
384 | pw->pw_name, user_hostfile); | |
385 | } else { | |
386 | temporarily_use_uid(pw); | |
387 | host_status = check_host_in_hostfile(user_hostfile, | |
388 | host, key, found, NULL); | |
389 | restore_uid(); | |
390 | } | |
391 | xfree(user_hostfile); | |
392 | } | |
393 | key_free(found); | |
394 | ||
395 | debug2("check_key_in_hostfiles: key %s for %s", host_status == HOST_OK ? | |
396 | "ok" : "not found", host); | |
397 | return host_status; | |
398 | } | |
399 | ||
400 | ||
c8445989 | 401 | /* |
402 | * Check a given file for security. This is defined as all components | |
d6097023 | 403 | * of the path to the file must be owned by either the owner of |
1ddf764b | 404 | * of the file or root and no directories must be group or world writable. |
c8445989 | 405 | * |
406 | * XXX Should any specific check be done for sym links ? | |
407 | * | |
408 | * Takes an open file descriptor, the file name, a uid and and | |
409 | * error buffer plus max size as arguments. | |
410 | * | |
411 | * Returns 0 on success and -1 on failure | |
412 | */ | |
413 | int | |
6978866a | 414 | secure_filename(FILE *f, const char *file, struct passwd *pw, |
415 | char *err, size_t errlen) | |
c8445989 | 416 | { |
6978866a | 417 | uid_t uid = pw->pw_uid; |
76fbdd47 | 418 | char buf[MAXPATHLEN], homedir[MAXPATHLEN]; |
c8445989 | 419 | char *cp; |
f6f02456 | 420 | int comparehome = 0; |
c8445989 | 421 | struct stat st; |
422 | ||
423 | if (realpath(file, buf) == NULL) { | |
424 | snprintf(err, errlen, "realpath %s failed: %s", file, | |
425 | strerror(errno)); | |
426 | return -1; | |
427 | } | |
f6f02456 | 428 | if (realpath(pw->pw_dir, homedir) != NULL) |
429 | comparehome = 1; | |
c8445989 | 430 | |
431 | /* check the open file to avoid races */ | |
432 | if (fstat(fileno(f), &st) < 0 || | |
433 | (st.st_uid != 0 && st.st_uid != uid) || | |
434 | (st.st_mode & 022) != 0) { | |
435 | snprintf(err, errlen, "bad ownership or modes for file %s", | |
436 | buf); | |
437 | return -1; | |
438 | } | |
439 | ||
440 | /* for each component of the canonical path, walking upwards */ | |
441 | for (;;) { | |
442 | if ((cp = dirname(buf)) == NULL) { | |
443 | snprintf(err, errlen, "dirname() failed"); | |
444 | return -1; | |
445 | } | |
446 | strlcpy(buf, cp, sizeof(buf)); | |
447 | ||
448 | debug3("secure_filename: checking '%s'", buf); | |
449 | if (stat(buf, &st) < 0 || | |
450 | (st.st_uid != 0 && st.st_uid != uid) || | |
451 | (st.st_mode & 022) != 0) { | |
184eed6a | 452 | snprintf(err, errlen, |
c8445989 | 453 | "bad ownership or modes for directory %s", buf); |
454 | return -1; | |
455 | } | |
456 | ||
afd501f9 | 457 | /* If are passed the homedir then we can stop */ |
f6f02456 | 458 | if (comparehome && strcmp(homedir, buf) == 0) { |
afd501f9 | 459 | debug3("secure_filename: terminating check at '%s'", |
460 | buf); | |
461 | break; | |
462 | } | |
c8445989 | 463 | /* |
464 | * dirname should always complete with a "/" path, | |
465 | * but we can be paranoid and check for "." too | |
466 | */ | |
467 | if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) | |
468 | break; | |
469 | } | |
470 | return 0; | |
471 | } | |
443fa1cd | 472 | |
473 | struct passwd * | |
474 | getpwnamallow(const char *user) | |
475 | { | |
1836f69f | 476 | #ifdef HAVE_LOGIN_CAP |
477 | extern login_cap_t *lc; | |
478 | #ifdef BSD_AUTH | |
479 | auth_session_t *as; | |
480 | #endif | |
481 | #endif | |
443fa1cd | 482 | struct passwd *pw; |
483 | ||
d231781a | 484 | parse_server_match_config(&options, user, |
485 | get_canonical_hostname(options.use_dns), get_remote_ipaddr()); | |
486 | ||
443fa1cd | 487 | pw = getpwnam(user); |
c2802d92 | 488 | if (pw == NULL) { |
227a6a97 | 489 | logit("Invalid user %.100s from %.100s", |
c2802d92 | 490 | user, get_remote_ipaddr()); |
73d9dad3 | 491 | #ifdef CUSTOM_FAILED_LOGIN |
575e336f | 492 | record_failed_login(user, |
493 | get_canonical_hostname(options.use_dns), "ssh"); | |
819d3f09 | 494 | #endif |
6039eeef | 495 | #ifdef SSH_AUDIT_EVENTS |
496 | audit_event(SSH_INVALID_USER); | |
497 | #endif /* SSH_AUDIT_EVENTS */ | |
c2802d92 | 498 | return (NULL); |
499 | } | |
500 | if (!allowed_user(pw)) | |
1836f69f | 501 | return (NULL); |
502 | #ifdef HAVE_LOGIN_CAP | |
503 | if ((lc = login_getclass(pw->pw_class)) == NULL) { | |
504 | debug("unable to get login class: %s", user); | |
505 | return (NULL); | |
506 | } | |
507 | #ifdef BSD_AUTH | |
508 | if ((as = auth_open()) == NULL || auth_setpwd(as, pw) != 0 || | |
65721f9c | 509 | auth_approval(as, lc, pw->pw_name, "ssh") <= 0) { |
1836f69f | 510 | debug("Approval failure for %s", user); |
443fa1cd | 511 | pw = NULL; |
1836f69f | 512 | } |
513 | if (as != NULL) | |
514 | auth_close(as); | |
515 | #endif | |
516 | #endif | |
06bea668 | 517 | if (pw != NULL) |
518 | return (pwcopy(pw)); | |
519 | return (NULL); | |
443fa1cd | 520 | } |
01dafcb5 | 521 | |
522 | void | |
523 | auth_debug_add(const char *fmt,...) | |
524 | { | |
525 | char buf[1024]; | |
526 | va_list args; | |
527 | ||
528 | if (!auth_debug_init) | |
529 | return; | |
530 | ||
531 | va_start(args, fmt); | |
532 | vsnprintf(buf, sizeof(buf), fmt, args); | |
533 | va_end(args); | |
534 | buffer_put_cstring(&auth_debug, buf); | |
535 | } | |
536 | ||
537 | void | |
538 | auth_debug_send(void) | |
539 | { | |
540 | char *msg; | |
541 | ||
542 | if (!auth_debug_init) | |
543 | return; | |
544 | while (buffer_len(&auth_debug)) { | |
545 | msg = buffer_get_string(&auth_debug, NULL); | |
546 | packet_send_debug("%s", msg); | |
547 | xfree(msg); | |
548 | } | |
549 | } | |
550 | ||
551 | void | |
552 | auth_debug_reset(void) | |
553 | { | |
554 | if (auth_debug_init) | |
555 | buffer_clear(&auth_debug); | |
556 | else { | |
557 | buffer_init(&auth_debug); | |
558 | auth_debug_init = 1; | |
559 | } | |
560 | } | |
96d0bf74 | 561 | |
562 | struct passwd * | |
563 | fakepw(void) | |
564 | { | |
565 | static struct passwd fake; | |
566 | ||
567 | memset(&fake, 0, sizeof(fake)); | |
568 | fake.pw_name = "NOUSER"; | |
569 | fake.pw_passwd = | |
b6453d99 | 570 | "$2a$06$r3.juUaHZDlIbQaO2dS9FuYxL1W9M81R1Tc92PoSNmzvpEqLkLGrK"; |
96d0bf74 | 571 | fake.pw_gecos = "NOUSER"; |
2b563deb | 572 | fake.pw_uid = privsep_pw == NULL ? (uid_t)-1 : privsep_pw->pw_uid; |
573 | fake.pw_gid = privsep_pw == NULL ? (gid_t)-1 : privsep_pw->pw_gid; | |
96d0bf74 | 574 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
575 | fake.pw_class = ""; | |
576 | #endif | |
577 | fake.pw_dir = "/nonexist"; | |
578 | fake.pw_shell = "/nonexist"; | |
579 | ||
580 | return (&fake); | |
581 | } |