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41b2f314 | 1 | /* |
2 | * | |
3 | * Copyright (c) 2001 Gert Doering. All rights reserved. | |
47686178 | 4 | * Copyright (c) 2003,2004,2005,2006 Darren Tucker. All rights reserved. |
41b2f314 | 5 | * |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * | |
15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
25 | * | |
26 | */ | |
e9a17296 | 27 | #include "includes.h" |
9108f8d9 | 28 | |
29 | #include "xmalloc.h" | |
30 | #include "buffer.h" | |
31 | #include "key.h" | |
32 | #include "hostfile.h" | |
cdd66111 | 33 | #include "auth.h" |
0fff78ff | 34 | #include "ssh.h" |
35 | #include "log.h" | |
e9a17296 | 36 | |
37 | #ifdef _AIX | |
38 | ||
9108f8d9 | 39 | #include <errno.h> |
40 | #if defined(HAVE_NETDB_H) | |
41 | # include <netdb.h> | |
42 | #endif | |
e9a17296 | 43 | #include <uinfo.h> |
9108f8d9 | 44 | #include <stdarg.h> |
45 | #include <string.h> | |
46 | #include <unistd.h> | |
996d5e62 | 47 | #include <sys/socket.h> |
9108f8d9 | 48 | |
49 | #ifdef WITH_AIXAUTHENTICATE | |
50 | # include <login.h> | |
51 | # include <userpw.h> | |
52 | # if defined(HAVE_SYS_AUDIT_H) && defined(AIX_LOGINFAILED_4ARG) | |
53 | # include <sys/audit.h> | |
54 | # endif | |
55 | # include <usersec.h> | |
56 | #endif | |
57 | ||
0fff78ff | 58 | #include "port-aix.h" |
59 | ||
3d738e65 | 60 | static char *lastlogin_msg = NULL; |
61 | ||
cdd66111 | 62 | # ifdef HAVE_SETAUTHDB |
63 | static char old_registry[REGISTRY_SIZE] = ""; | |
64 | # endif | |
e9a17296 | 65 | |
e9a17296 | 66 | /* |
665a873d | 67 | * AIX has a "usrinfo" area where logname and other stuff is stored - |
41b2f314 | 68 | * a few applications actually use this and die if it's not set |
69 | * | |
70 | * NOTE: TTY= should be set, but since no one uses it and it's hard to | |
71 | * acquire due to privsep code. We will just drop support. | |
e9a17296 | 72 | */ |
73 | void | |
41b2f314 | 74 | aix_usrinfo(struct passwd *pw) |
e9a17296 | 75 | { |
76 | u_int i; | |
0fff78ff | 77 | size_t len; |
41b2f314 | 78 | char *cp; |
e9a17296 | 79 | |
0fff78ff | 80 | len = sizeof("LOGNAME= NAME= ") + (2 * strlen(pw->pw_name)); |
81 | cp = xmalloc(len); | |
82 | ||
665a873d | 83 | i = snprintf(cp, len, "LOGNAME=%s%cNAME=%s%c", pw->pw_name, '\0', |
0fff78ff | 84 | pw->pw_name, '\0'); |
e9a17296 | 85 | if (usrinfo(SETUINFO, cp, i) == -1) |
86 | fatal("Couldn't set usrinfo: %s", strerror(errno)); | |
87 | debug3("AIX/UsrInfo: set len %d", i); | |
0fff78ff | 88 | |
e9a17296 | 89 | xfree(cp); |
90 | } | |
91 | ||
cdd66111 | 92 | # ifdef WITH_AIXAUTHENTICATE |
0fff78ff | 93 | /* |
94 | * Remove embedded newlines in string (if any). | |
95 | * Used before logging messages returned by AIX authentication functions | |
96 | * so the message is logged on one line. | |
97 | */ | |
98 | void | |
99 | aix_remove_embedded_newlines(char *p) | |
100 | { | |
101 | if (p == NULL) | |
102 | return; | |
103 | ||
104 | for (; *p; p++) { | |
105 | if (*p == '\n') | |
106 | *p = ' '; | |
107 | } | |
108 | /* Remove trailing whitespace */ | |
109 | if (*--p == ' ') | |
110 | *p = '\0'; | |
111 | } | |
cdd66111 | 112 | |
996d5e62 | 113 | /* |
114 | * Test specifically for the case where SYSTEM == NONE and AUTH1 contains | |
115 | * anything other than NONE or SYSTEM, which indicates that the admin has | |
116 | * configured the account for purely AUTH1-type authentication. | |
117 | * | |
118 | * Since authenticate() doesn't check AUTH1, and sshd can't sanely support | |
119 | * AUTH1 itself, in such a case authenticate() will allow access without | |
120 | * authentation, which is almost certainly not what the admin intends. | |
121 | * | |
122 | * (The native tools, eg login, will process the AUTH1 list in addition to | |
123 | * the SYSTEM list by using ckuserID(), however ckuserID() and AUTH1 methods | |
124 | * have been deprecated since AIX 4.2.x and would be very difficult for sshd | |
125 | * to support. | |
126 | * | |
127 | * Returns 0 if an unsupportable combination is found, 1 otherwise. | |
128 | */ | |
129 | static int | |
130 | aix_valid_authentications(const char *user) | |
131 | { | |
132 | char *auth1, *sys, *p; | |
133 | int valid = 1; | |
134 | ||
135 | if (getuserattr((char *)user, S_AUTHSYSTEM, &sys, SEC_CHAR) != 0) { | |
136 | logit("Can't retrieve attribute SYSTEM for %s: %.100s", | |
137 | user, strerror(errno)); | |
138 | return 0; | |
139 | } | |
140 | ||
141 | debug3("AIX SYSTEM attribute %s", sys); | |
142 | if (strcmp(sys, "NONE") != 0) | |
143 | return 1; /* not "NONE", so is OK */ | |
144 | ||
145 | if (getuserattr((char *)user, S_AUTH1, &auth1, SEC_LIST) != 0) { | |
146 | logit("Can't retrieve attribute auth1 for %s: %.100s", | |
147 | user, strerror(errno)); | |
148 | return 0; | |
149 | } | |
150 | ||
151 | p = auth1; | |
152 | /* A SEC_LIST is concatenated strings, ending with two NULs. */ | |
153 | while (p[0] != '\0' && p[1] != '\0') { | |
154 | debug3("AIX auth1 attribute list member %s", p); | |
155 | if (strcmp(p, "NONE") != 0 && strcmp(p, "SYSTEM")) { | |
156 | logit("Account %s has unsupported auth1 value '%s'", | |
157 | user, p); | |
158 | valid = 0; | |
159 | } | |
160 | p += strlen(p) + 1; | |
161 | } | |
162 | ||
163 | return (valid); | |
164 | } | |
165 | ||
cdd66111 | 166 | /* |
167 | * Do authentication via AIX's authenticate routine. We loop until the | |
168 | * reenter parameter is 0, but normally authenticate is called only once. | |
169 | * | |
170 | * Note: this function returns 1 on success, whereas AIX's authenticate() | |
171 | * returns 0. | |
172 | */ | |
173 | int | |
dec6d9fe | 174 | sys_auth_passwd(Authctxt *ctxt, const char *password) |
cdd66111 | 175 | { |
665a873d | 176 | char *authmsg = NULL, *msg = NULL, *name = ctxt->pw->pw_name; |
cdd66111 | 177 | int authsuccess = 0, expired, reenter, result; |
178 | ||
179 | do { | |
180 | result = authenticate((char *)name, (char *)password, &reenter, | |
181 | &authmsg); | |
182 | aix_remove_embedded_newlines(authmsg); | |
665a873d | 183 | debug3("AIX/authenticate result %d, authmsg %.100s", result, |
cdd66111 | 184 | authmsg); |
185 | } while (reenter); | |
186 | ||
996d5e62 | 187 | if (!aix_valid_authentications(name)) |
188 | result = -1; | |
189 | ||
cdd66111 | 190 | if (result == 0) { |
191 | authsuccess = 1; | |
192 | ||
665a873d | 193 | /* |
cdd66111 | 194 | * Record successful login. We don't have a pty yet, so just |
195 | * label the line as "ssh" | |
196 | */ | |
197 | aix_setauthdb(name); | |
cdd66111 | 198 | |
199 | /* | |
200 | * Check if the user's password is expired. | |
201 | */ | |
c9f39d2c | 202 | expired = passwdexpired(name, &msg); |
203 | if (msg && *msg) { | |
dec6d9fe | 204 | buffer_append(ctxt->loginmsg, msg, strlen(msg)); |
c9f39d2c | 205 | aix_remove_embedded_newlines(msg); |
206 | } | |
207 | debug3("AIX/passwdexpired returned %d msg %.100s", expired, msg); | |
cdd66111 | 208 | |
209 | switch (expired) { | |
210 | case 0: /* password not expired */ | |
211 | break; | |
212 | case 1: /* expired, password change required */ | |
213 | ctxt->force_pwchange = 1; | |
cdd66111 | 214 | break; |
215 | default: /* user can't change(2) or other error (-1) */ | |
216 | logit("Password can't be changed for user %s: %.100s", | |
217 | name, msg); | |
218 | if (msg) | |
219 | xfree(msg); | |
220 | authsuccess = 0; | |
221 | } | |
222 | ||
223 | aix_restoreauthdb(); | |
224 | } | |
225 | ||
226 | if (authmsg != NULL) | |
227 | xfree(authmsg); | |
228 | ||
229 | return authsuccess; | |
230 | } | |
c9f39d2c | 231 | |
232 | /* | |
233 | * Check if specified account is permitted to log in. | |
234 | * Returns 1 if login is allowed, 0 if not allowed. | |
235 | */ | |
236 | int | |
996d5e62 | 237 | sys_auth_allowed_user(struct passwd *pw, Buffer *loginmsg) |
c9f39d2c | 238 | { |
239 | char *msg = NULL; | |
240 | int result, permitted = 0; | |
241 | struct stat st; | |
242 | ||
243 | /* | |
244 | * Don't perform checks for root account (PermitRootLogin controls | |
d4487008 | 245 | * logins via ssh) or if running as non-root user (since |
c9f39d2c | 246 | * loginrestrictions will always fail due to insufficient privilege). |
247 | */ | |
248 | if (pw->pw_uid == 0 || geteuid() != 0) { | |
249 | debug3("%s: not checking", __func__); | |
250 | return 1; | |
251 | } | |
252 | ||
253 | result = loginrestrictions(pw->pw_name, S_RLOGIN, NULL, &msg); | |
254 | if (result == 0) | |
255 | permitted = 1; | |
256 | /* | |
257 | * If restricted because /etc/nologin exists, the login will be denied | |
258 | * in session.c after the nologin message is sent, so allow for now | |
259 | * and do not append the returned message. | |
260 | */ | |
261 | if (result == -1 && errno == EPERM && stat(_PATH_NOLOGIN, &st) == 0) | |
262 | permitted = 1; | |
263 | else if (msg != NULL) | |
996d5e62 | 264 | buffer_append(loginmsg, msg, strlen(msg)); |
c9f39d2c | 265 | if (msg == NULL) |
266 | msg = xstrdup("(none)"); | |
267 | aix_remove_embedded_newlines(msg); | |
268 | debug3("AIX/loginrestrictions returned %d msg %.100s", result, msg); | |
269 | ||
270 | if (!permitted) | |
271 | logit("Login restricted for %s: %.100s", pw->pw_name, msg); | |
272 | xfree(msg); | |
273 | return permitted; | |
274 | } | |
275 | ||
276 | int | |
996d5e62 | 277 | sys_auth_record_login(const char *user, const char *host, const char *ttynm, |
278 | Buffer *loginmsg) | |
c9f39d2c | 279 | { |
665a873d | 280 | char *msg = NULL; |
c9f39d2c | 281 | int success = 0; |
282 | ||
283 | aix_setauthdb(user); | |
996d5e62 | 284 | if (loginsuccess((char *)user, (char *)host, (char *)ttynm, &msg) == 0) { |
c9f39d2c | 285 | success = 1; |
3d738e65 | 286 | if (msg != NULL) { |
996d5e62 | 287 | debug("AIX/loginsuccess: msg %s", msg); |
3d738e65 | 288 | if (lastlogin_msg == NULL) |
289 | lastlogin_msg = msg; | |
c9f39d2c | 290 | } |
291 | } | |
292 | aix_restoreauthdb(); | |
293 | return (success); | |
294 | } | |
295 | ||
3d738e65 | 296 | char * |
297 | sys_auth_get_lastlogin_msg(const char *user, uid_t uid) | |
298 | { | |
299 | char *msg = lastlogin_msg; | |
300 | ||
301 | lastlogin_msg = NULL; | |
302 | return msg; | |
303 | } | |
304 | ||
cdd66111 | 305 | # ifdef CUSTOM_FAILED_LOGIN |
0fff78ff | 306 | /* |
307 | * record_failed_login: generic "login failed" interface function | |
308 | */ | |
309 | void | |
996d5e62 | 310 | record_failed_login(const char *user, const char *hostname, const char *ttyname) |
0fff78ff | 311 | { |
0fff78ff | 312 | if (geteuid() != 0) |
313 | return; | |
314 | ||
315 | aix_setauthdb(user); | |
cdd66111 | 316 | # ifdef AIX_LOGINFAILED_4ARG |
996d5e62 | 317 | loginfailed((char *)user, (char *)hostname, (char *)ttyname, |
318 | AUDIT_FAIL_AUTH); | |
cdd66111 | 319 | # else |
996d5e62 | 320 | loginfailed((char *)user, (char *)hostname, (char *)ttyname); |
cdd66111 | 321 | # endif |
322 | aix_restoreauthdb(); | |
0fff78ff | 323 | } |
cdd66111 | 324 | # endif /* CUSTOM_FAILED_LOGIN */ |
0fff78ff | 325 | |
326 | /* | |
327 | * If we have setauthdb, retrieve the password registry for the user's | |
cdd66111 | 328 | * account then feed it to setauthdb. This will mean that subsequent AIX auth |
329 | * functions will only use the specified loadable module. If we don't have | |
330 | * setauthdb this is a no-op. | |
0fff78ff | 331 | */ |
332 | void | |
333 | aix_setauthdb(const char *user) | |
334 | { | |
335 | # ifdef HAVE_SETAUTHDB | |
cdd66111 | 336 | char *registry; |
0fff78ff | 337 | |
338 | if (setuserdb(S_READ) == -1) { | |
339 | debug3("%s: Could not open userdb to read", __func__); | |
340 | return; | |
341 | } | |
342 | ||
343 | if (getuserattr((char *)user, S_REGISTRY, ®istry, SEC_CHAR) == 0) { | |
cdd66111 | 344 | if (setauthdb(registry, old_registry) == 0) |
345 | debug3("AIX/setauthdb set registry '%s'", registry); | |
0fff78ff | 346 | else |
cdd66111 | 347 | debug3("AIX/setauthdb set registry '%s' failed: %s", |
348 | registry, strerror(errno)); | |
0fff78ff | 349 | } else |
350 | debug3("%s: Could not read S_REGISTRY for user: %s", __func__, | |
351 | strerror(errno)); | |
352 | enduserdb(); | |
cdd66111 | 353 | # endif /* HAVE_SETAUTHDB */ |
0fff78ff | 354 | } |
9cb1827b | 355 | |
cdd66111 | 356 | /* |
357 | * Restore the user's registry settings from old_registry. | |
358 | * Note that if the first aix_setauthdb fails, setauthdb("") is still safe | |
359 | * (it restores the system default behaviour). If we don't have setauthdb, | |
360 | * this is a no-op. | |
361 | */ | |
362 | void | |
363 | aix_restoreauthdb(void) | |
364 | { | |
365 | # ifdef HAVE_SETAUTHDB | |
366 | if (setauthdb(old_registry, NULL) == 0) | |
367 | debug3("%s: restoring old registry '%s'", __func__, | |
368 | old_registry); | |
369 | else | |
370 | debug3("%s: failed to restore old registry %s", __func__, | |
371 | old_registry); | |
372 | # endif /* HAVE_SETAUTHDB */ | |
373 | } | |
374 | ||
375 | # endif /* WITH_AIXAUTHENTICATE */ | |
376 | ||
996d5e62 | 377 | # if defined(AIX_GETNAMEINFO_HACK) && !defined(BROKEN_ADDRINFO) |
378 | # undef getnameinfo | |
379 | /* | |
380 | * For some reason, AIX's getnameinfo will refuse to resolve the all-zeros | |
381 | * IPv6 address into its textual representation ("::"), so we wrap it | |
382 | * with a function that will. | |
383 | */ | |
384 | int | |
385 | sshaix_getnameinfo(const struct sockaddr *sa, size_t salen, char *host, | |
386 | size_t hostlen, char *serv, size_t servlen, int flags) | |
387 | { | |
388 | struct sockaddr_in6 *sa6; | |
389 | u_int32_t *a6; | |
390 | ||
391 | if (flags & (NI_NUMERICHOST|NI_NUMERICSERV) && | |
392 | sa->sa_family == AF_INET6) { | |
393 | sa6 = (struct sockaddr_in6 *)sa; | |
394 | a6 = sa6->sin6_addr.u6_addr.u6_addr32; | |
395 | ||
396 | if (a6[0] == 0 && a6[1] == 0 && a6[2] == 0 && a6[3] == 0) { | |
397 | strlcpy(host, "::", hostlen); | |
398 | snprintf(serv, servlen, "%d", sa6->sin6_port); | |
399 | return 0; | |
400 | } | |
401 | } | |
402 | return getnameinfo(sa, salen, host, hostlen, serv, servlen, flags); | |
403 | } | |
404 | # endif /* AIX_GETNAMEINFO_HACK */ | |
405 | ||
47686178 | 406 | # if defined(USE_GETGRSET) |
407 | # include <stdlib.h> | |
408 | int | |
409 | getgrouplist(const char *user, gid_t pgid, gid_t *groups, int *grpcnt) | |
410 | { | |
411 | char *cp, *grplist, *grp; | |
412 | gid_t gid; | |
413 | int ret = 0, ngroups = 0, maxgroups; | |
414 | long l; | |
415 | ||
416 | maxgroups = *grpcnt; | |
417 | ||
418 | if ((cp = grplist = getgrset(user)) == NULL) | |
419 | return -1; | |
420 | ||
421 | /* handle zero-length case */ | |
422 | if (maxgroups <= 0) { | |
423 | *grpcnt = 0; | |
424 | return -1; | |
425 | } | |
426 | ||
427 | /* copy primary group */ | |
428 | groups[ngroups++] = pgid; | |
429 | ||
430 | /* copy each entry from getgrset into group list */ | |
431 | while ((grp = strsep(&grplist, ",")) != NULL) { | |
432 | l = strtol(grp, NULL, 10); | |
433 | if (ngroups >= maxgroups || l == LONG_MIN || l == LONG_MAX) { | |
434 | ret = -1; | |
435 | goto out; | |
436 | } | |
437 | gid = (gid_t)l; | |
438 | if (gid == pgid) | |
439 | continue; /* we have already added primary gid */ | |
440 | groups[ngroups++] = gid; | |
441 | } | |
442 | out: | |
443 | free(cp); | |
444 | *grpcnt = ngroups; | |
445 | return ret; | |
446 | } | |
447 | # endif /* USE_GETGRSET */ | |
448 | ||
cdd66111 | 449 | #endif /* _AIX */ |