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0ba40daa | 1 | /* |
34a88012 | 2 | * |
3 | * Copyright (c) 2001 Gert Doering. All rights reserved. | |
c8ed2130 | 4 | * Copyright (c) 2003,2004,2005 Darren Tucker. All rights reserved. |
34a88012 | 5 | * |
0ba40daa | 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 | */ | |
90e70cfc | 27 | #include "includes.h" |
31652869 | 28 | |
29 | #include "xmalloc.h" | |
30 | #include "buffer.h" | |
31 | #include "key.h" | |
32 | #include "hostfile.h" | |
262b1744 | 33 | #include "auth.h" |
73d9dad3 | 34 | #include "ssh.h" |
35 | #include "log.h" | |
90e70cfc | 36 | |
37 | #ifdef _AIX | |
38 | ||
4f4b7d4d | 39 | #include <errno.h> |
c8dfff33 | 40 | #if defined(HAVE_NETDB_H) |
41 | # include <netdb.h> | |
42 | #endif | |
90e70cfc | 43 | #include <uinfo.h> |
24436b92 | 44 | #include <stdarg.h> |
e204f3ee | 45 | #include <string.h> |
46 | #include <unistd.h> | |
5ccf88cb | 47 | #include <sys/socket.h> |
d9ed544b | 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 | ||
2aa3a16c | 58 | #include "port-aix.h" |
90e70cfc | 59 | |
d852ad8b | 60 | # ifdef HAVE_SETAUTHDB |
61 | static char old_registry[REGISTRY_SIZE] = ""; | |
62 | # endif | |
63 | ||
90e70cfc | 64 | /* |
5700232d | 65 | * AIX has a "usrinfo" area where logname and other stuff is stored - |
0ba40daa | 66 | * a few applications actually use this and die if it's not set |
67 | * | |
68 | * NOTE: TTY= should be set, but since no one uses it and it's hard to | |
69 | * acquire due to privsep code. We will just drop support. | |
90e70cfc | 70 | */ |
71 | void | |
0ba40daa | 72 | aix_usrinfo(struct passwd *pw) |
90e70cfc | 73 | { |
90e70cfc | 74 | u_int i; |
9901cb37 | 75 | size_t len; |
0ba40daa | 76 | char *cp; |
90e70cfc | 77 | |
9901cb37 | 78 | len = sizeof("LOGNAME= NAME= ") + (2 * strlen(pw->pw_name)); |
79 | cp = xmalloc(len); | |
80 | ||
5700232d | 81 | i = snprintf(cp, len, "LOGNAME=%s%cNAME=%s%c", pw->pw_name, '\0', |
1e72a7e3 | 82 | pw->pw_name, '\0'); |
90e70cfc | 83 | if (usrinfo(SETUINFO, cp, i) == -1) |
84 | fatal("Couldn't set usrinfo: %s", strerror(errno)); | |
85 | debug3("AIX/UsrInfo: set len %d", i); | |
9901cb37 | 86 | |
90e70cfc | 87 | xfree(cp); |
88 | } | |
89 | ||
f0b467ef | 90 | # ifdef WITH_AIXAUTHENTICATE |
bc7dfc06 | 91 | /* |
92 | * Remove embedded newlines in string (if any). | |
93 | * Used before logging messages returned by AIX authentication functions | |
94 | * so the message is logged on one line. | |
95 | */ | |
96 | void | |
97 | aix_remove_embedded_newlines(char *p) | |
98 | { | |
99 | if (p == NULL) | |
100 | return; | |
101 | ||
102 | for (; *p; p++) { | |
103 | if (*p == '\n') | |
104 | *p = ' '; | |
105 | } | |
106 | /* Remove trailing whitespace */ | |
107 | if (*--p == ' ') | |
108 | *p = '\0'; | |
109 | } | |
f0b467ef | 110 | |
1383f285 | 111 | /* |
112 | * Test specifically for the case where SYSTEM == NONE and AUTH1 contains | |
113 | * anything other than NONE or SYSTEM, which indicates that the admin has | |
114 | * configured the account for purely AUTH1-type authentication. | |
115 | * | |
116 | * Since authenticate() doesn't check AUTH1, and sshd can't sanely support | |
117 | * AUTH1 itself, in such a case authenticate() will allow access without | |
118 | * authentation, which is almost certainly not what the admin intends. | |
119 | * | |
120 | * (The native tools, eg login, will process the AUTH1 list in addition to | |
121 | * the SYSTEM list by using ckuserID(), however ckuserID() and AUTH1 methods | |
122 | * have been deprecated since AIX 4.2.x and would be very difficult for sshd | |
123 | * to support. | |
124 | * | |
125 | * Returns 0 if an unsupportable combination is found, 1 otherwise. | |
126 | */ | |
127 | static int | |
128 | aix_valid_authentications(const char *user) | |
129 | { | |
130 | char *auth1, *sys, *p; | |
131 | int valid = 1; | |
132 | ||
133 | if (getuserattr((char *)user, S_AUTHSYSTEM, &sys, SEC_CHAR) != 0) { | |
134 | logit("Can't retrieve attribute SYSTEM for %s: %.100s", | |
135 | user, strerror(errno)); | |
136 | return 0; | |
137 | } | |
138 | ||
139 | debug3("AIX SYSTEM attribute %s", sys); | |
140 | if (strcmp(sys, "NONE") != 0) | |
141 | return 1; /* not "NONE", so is OK */ | |
142 | ||
143 | if (getuserattr((char *)user, S_AUTH1, &auth1, SEC_LIST) != 0) { | |
144 | logit("Can't retrieve attribute auth1 for %s: %.100s", | |
145 | user, strerror(errno)); | |
146 | return 0; | |
147 | } | |
148 | ||
149 | p = auth1; | |
150 | /* A SEC_LIST is concatenated strings, ending with two NULs. */ | |
151 | while (p[0] != '\0' && p[1] != '\0') { | |
152 | debug3("AIX auth1 attribute list member %s", p); | |
153 | if (strcmp(p, "NONE") != 0 && strcmp(p, "SYSTEM")) { | |
154 | logit("Account %s has unsupported auth1 value '%s'", | |
155 | user, p); | |
156 | valid = 0; | |
157 | } | |
158 | p += strlen(p) + 1; | |
159 | } | |
160 | ||
161 | return (valid); | |
162 | } | |
163 | ||
f0b467ef | 164 | /* |
165 | * Do authentication via AIX's authenticate routine. We loop until the | |
166 | * reenter parameter is 0, but normally authenticate is called only once. | |
167 | * | |
168 | * Note: this function returns 1 on success, whereas AIX's authenticate() | |
169 | * returns 0. | |
170 | */ | |
171 | int | |
1b394137 | 172 | sys_auth_passwd(Authctxt *ctxt, const char *password) |
f0b467ef | 173 | { |
c8ed2130 | 174 | char *authmsg = NULL, *msg = NULL, *name = ctxt->pw->pw_name; |
cadfc759 | 175 | int authsuccess = 0, expired, reenter, result; |
f0b467ef | 176 | |
177 | do { | |
178 | result = authenticate((char *)name, (char *)password, &reenter, | |
179 | &authmsg); | |
180 | aix_remove_embedded_newlines(authmsg); | |
ec7f28f2 | 181 | debug3("AIX/authenticate result %d, authmsg %.100s", result, |
f0b467ef | 182 | authmsg); |
183 | } while (reenter); | |
184 | ||
1383f285 | 185 | if (!aix_valid_authentications(name)) |
186 | result = -1; | |
187 | ||
f0b467ef | 188 | if (result == 0) { |
189 | authsuccess = 1; | |
190 | ||
5700232d | 191 | /* |
cadfc759 | 192 | * Record successful login. We don't have a pty yet, so just |
193 | * label the line as "ssh" | |
194 | */ | |
f0b467ef | 195 | aix_setauthdb(name); |
cadfc759 | 196 | |
197 | /* | |
198 | * Check if the user's password is expired. | |
199 | */ | |
6d05637a | 200 | expired = passwdexpired(name, &msg); |
201 | if (msg && *msg) { | |
1b394137 | 202 | buffer_append(ctxt->loginmsg, msg, strlen(msg)); |
6d05637a | 203 | aix_remove_embedded_newlines(msg); |
204 | } | |
205 | debug3("AIX/passwdexpired returned %d msg %.100s", expired, msg); | |
cadfc759 | 206 | |
207 | switch (expired) { | |
208 | case 0: /* password not expired */ | |
209 | break; | |
210 | case 1: /* expired, password change required */ | |
211 | ctxt->force_pwchange = 1; | |
cadfc759 | 212 | break; |
213 | default: /* user can't change(2) or other error (-1) */ | |
214 | logit("Password can't be changed for user %s: %.100s", | |
215 | name, msg); | |
216 | if (msg) | |
217 | xfree(msg); | |
218 | authsuccess = 0; | |
219 | } | |
220 | ||
d852ad8b | 221 | aix_restoreauthdb(); |
f0b467ef | 222 | } |
223 | ||
224 | if (authmsg != NULL) | |
225 | xfree(authmsg); | |
226 | ||
227 | return authsuccess; | |
228 | } | |
bc5c2025 | 229 | |
230 | /* | |
231 | * Check if specified account is permitted to log in. | |
232 | * Returns 1 if login is allowed, 0 if not allowed. | |
233 | */ | |
234 | int | |
5ccf88cb | 235 | sys_auth_allowed_user(struct passwd *pw, Buffer *loginmsg) |
bc5c2025 | 236 | { |
237 | char *msg = NULL; | |
238 | int result, permitted = 0; | |
239 | struct stat st; | |
240 | ||
241 | /* | |
242 | * Don't perform checks for root account (PermitRootLogin controls | |
86c718e3 | 243 | * logins via ssh) or if running as non-root user (since |
bc5c2025 | 244 | * loginrestrictions will always fail due to insufficient privilege). |
245 | */ | |
246 | if (pw->pw_uid == 0 || geteuid() != 0) { | |
13f72b91 | 247 | debug3("%s: not checking", __func__); |
bc5c2025 | 248 | return 1; |
249 | } | |
250 | ||
251 | result = loginrestrictions(pw->pw_name, S_RLOGIN, NULL, &msg); | |
252 | if (result == 0) | |
253 | permitted = 1; | |
254 | /* | |
255 | * If restricted because /etc/nologin exists, the login will be denied | |
256 | * in session.c after the nologin message is sent, so allow for now | |
257 | * and do not append the returned message. | |
258 | */ | |
259 | if (result == -1 && errno == EPERM && stat(_PATH_NOLOGIN, &st) == 0) | |
260 | permitted = 1; | |
261 | else if (msg != NULL) | |
5ccf88cb | 262 | buffer_append(loginmsg, msg, strlen(msg)); |
bc5c2025 | 263 | if (msg == NULL) |
264 | msg = xstrdup("(none)"); | |
265 | aix_remove_embedded_newlines(msg); | |
266 | debug3("AIX/loginrestrictions returned %d msg %.100s", result, msg); | |
267 | ||
268 | if (!permitted) | |
269 | logit("Login restricted for %s: %.100s", pw->pw_name, msg); | |
270 | xfree(msg); | |
271 | return permitted; | |
272 | } | |
273 | ||
f5ed3301 | 274 | int |
5ccf88cb | 275 | sys_auth_record_login(const char *user, const char *host, const char *ttynm, |
276 | Buffer *loginmsg) | |
f5ed3301 | 277 | { |
c8ed2130 | 278 | char *msg = NULL; |
6545dd0b | 279 | static int msg_done = 0; |
f5ed3301 | 280 | int success = 0; |
281 | ||
282 | aix_setauthdb(user); | |
c2edf154 | 283 | if (loginsuccess((char *)user, (char *)host, (char *)ttynm, &msg) == 0) { |
f5ed3301 | 284 | success = 1; |
6545dd0b | 285 | if (msg != NULL && loginmsg != NULL && !msg_done) { |
c2edf154 | 286 | debug("AIX/loginsuccess: msg %s", msg); |
5ccf88cb | 287 | buffer_append(loginmsg, msg, strlen(msg)); |
f5ed3301 | 288 | xfree(msg); |
6545dd0b | 289 | msg_done = 1; |
f5ed3301 | 290 | } |
291 | } | |
292 | aix_restoreauthdb(); | |
293 | return (success); | |
294 | } | |
295 | ||
f0b467ef | 296 | # ifdef CUSTOM_FAILED_LOGIN |
73d9dad3 | 297 | /* |
298 | * record_failed_login: generic "login failed" interface function | |
299 | */ | |
300 | void | |
575e336f | 301 | record_failed_login(const char *user, const char *hostname, const char *ttyname) |
73d9dad3 | 302 | { |
2aa3a16c | 303 | if (geteuid() != 0) |
304 | return; | |
305 | ||
306 | aix_setauthdb(user); | |
f0b467ef | 307 | # ifdef AIX_LOGINFAILED_4ARG |
c2edf154 | 308 | loginfailed((char *)user, (char *)hostname, (char *)ttyname, |
309 | AUDIT_FAIL_AUTH); | |
f0b467ef | 310 | # else |
c2edf154 | 311 | loginfailed((char *)user, (char *)hostname, (char *)ttyname); |
f0b467ef | 312 | # endif |
d852ad8b | 313 | aix_restoreauthdb(); |
73d9dad3 | 314 | } |
f0b467ef | 315 | # endif /* CUSTOM_FAILED_LOGIN */ |
2aa3a16c | 316 | |
317 | /* | |
318 | * If we have setauthdb, retrieve the password registry for the user's | |
d852ad8b | 319 | * account then feed it to setauthdb. This will mean that subsequent AIX auth |
320 | * functions will only use the specified loadable module. If we don't have | |
321 | * setauthdb this is a no-op. | |
2aa3a16c | 322 | */ |
323 | void | |
324 | aix_setauthdb(const char *user) | |
325 | { | |
326 | # ifdef HAVE_SETAUTHDB | |
d852ad8b | 327 | char *registry; |
2aa3a16c | 328 | |
329 | if (setuserdb(S_READ) == -1) { | |
330 | debug3("%s: Could not open userdb to read", __func__); | |
331 | return; | |
332 | } | |
333 | ||
334 | if (getuserattr((char *)user, S_REGISTRY, ®istry, SEC_CHAR) == 0) { | |
d852ad8b | 335 | if (setauthdb(registry, old_registry) == 0) |
336 | debug3("AIX/setauthdb set registry '%s'", registry); | |
2aa3a16c | 337 | else |
d852ad8b | 338 | debug3("AIX/setauthdb set registry '%s' failed: %s", |
339 | registry, strerror(errno)); | |
2aa3a16c | 340 | } else |
341 | debug3("%s: Could not read S_REGISTRY for user: %s", __func__, | |
342 | strerror(errno)); | |
343 | enduserdb(); | |
f0b467ef | 344 | # endif /* HAVE_SETAUTHDB */ |
2aa3a16c | 345 | } |
90e70cfc | 346 | |
d852ad8b | 347 | /* |
348 | * Restore the user's registry settings from old_registry. | |
349 | * Note that if the first aix_setauthdb fails, setauthdb("") is still safe | |
350 | * (it restores the system default behaviour). If we don't have setauthdb, | |
351 | * this is a no-op. | |
352 | */ | |
353 | void | |
354 | aix_restoreauthdb(void) | |
355 | { | |
356 | # ifdef HAVE_SETAUTHDB | |
357 | if (setauthdb(old_registry, NULL) == 0) | |
358 | debug3("%s: restoring old registry '%s'", __func__, | |
359 | old_registry); | |
360 | else | |
361 | debug3("%s: failed to restore old registry %s", __func__, | |
362 | old_registry); | |
363 | # endif /* HAVE_SETAUTHDB */ | |
364 | } | |
365 | ||
f0b467ef | 366 | # endif /* WITH_AIXAUTHENTICATE */ |
367 | ||
5ccf88cb | 368 | # if defined(AIX_GETNAMEINFO_HACK) && !defined(BROKEN_ADDRINFO) |
369 | # undef getnameinfo | |
370 | /* | |
371 | * For some reason, AIX's getnameinfo will refuse to resolve the all-zeros | |
372 | * IPv6 address into its textual representation ("::"), so we wrap it | |
373 | * with a function that will. | |
374 | */ | |
375 | int | |
376 | sshaix_getnameinfo(const struct sockaddr *sa, size_t salen, char *host, | |
377 | size_t hostlen, char *serv, size_t servlen, int flags) | |
378 | { | |
379 | struct sockaddr_in6 *sa6; | |
380 | u_int32_t *a6; | |
381 | ||
382 | if (flags & (NI_NUMERICHOST|NI_NUMERICSERV) && | |
383 | sa->sa_family == AF_INET6) { | |
384 | sa6 = (struct sockaddr_in6 *)sa; | |
385 | a6 = sa6->sin6_addr.u6_addr.u6_addr32; | |
386 | ||
387 | if (a6[0] == 0 && a6[1] == 0 && a6[2] == 0 && a6[3] == 0) { | |
388 | strlcpy(host, "::", hostlen); | |
389 | snprintf(serv, servlen, "%d", sa6->sin6_port); | |
390 | return 0; | |
391 | } | |
392 | } | |
393 | return getnameinfo(sa, salen, host, hostlen, serv, servlen, flags); | |
394 | } | |
395 | # endif /* AIX_GETNAMEINFO_HACK */ | |
396 | ||
f0b467ef | 397 | #endif /* _AIX */ |