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1 | /* | |
2 | * | |
3 | * Copyright (c) 2001 Gert Doering. All rights reserved. | |
4 | * Copyright (c) 2003,2004,2005 Darren Tucker. All rights reserved. | |
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 | */ | |
27 | #include "includes.h" | |
28 | ||
29 | #include "xmalloc.h" | |
30 | #include "buffer.h" | |
31 | #include "key.h" | |
32 | #include "hostfile.h" | |
33 | #include "auth.h" | |
34 | #include "ssh.h" | |
35 | #include "log.h" | |
36 | ||
37 | #ifdef _AIX | |
38 | ||
39 | #include <errno.h> | |
40 | #if defined(HAVE_NETDB_H) | |
41 | # include <netdb.h> | |
42 | #endif | |
43 | #include <uinfo.h> | |
44 | #include <stdarg.h> | |
45 | #include <string.h> | |
46 | #include <unistd.h> | |
47 | #include <sys/socket.h> | |
48 | #include "port-aix.h" | |
49 | ||
50 | # ifdef HAVE_SETAUTHDB | |
51 | static char old_registry[REGISTRY_SIZE] = ""; | |
52 | # endif | |
53 | ||
54 | /* | |
55 | * AIX has a "usrinfo" area where logname and other stuff is stored - | |
56 | * a few applications actually use this and die if it's not set | |
57 | * | |
58 | * NOTE: TTY= should be set, but since no one uses it and it's hard to | |
59 | * acquire due to privsep code. We will just drop support. | |
60 | */ | |
61 | void | |
62 | aix_usrinfo(struct passwd *pw) | |
63 | { | |
64 | u_int i; | |
65 | size_t len; | |
66 | char *cp; | |
67 | ||
68 | len = sizeof("LOGNAME= NAME= ") + (2 * strlen(pw->pw_name)); | |
69 | cp = xmalloc(len); | |
70 | ||
71 | i = snprintf(cp, len, "LOGNAME=%s%cNAME=%s%c", pw->pw_name, '\0', | |
72 | pw->pw_name, '\0'); | |
73 | if (usrinfo(SETUINFO, cp, i) == -1) | |
74 | fatal("Couldn't set usrinfo: %s", strerror(errno)); | |
75 | debug3("AIX/UsrInfo: set len %d", i); | |
76 | ||
77 | xfree(cp); | |
78 | } | |
79 | ||
80 | # ifdef WITH_AIXAUTHENTICATE | |
81 | /* | |
82 | * Remove embedded newlines in string (if any). | |
83 | * Used before logging messages returned by AIX authentication functions | |
84 | * so the message is logged on one line. | |
85 | */ | |
86 | void | |
87 | aix_remove_embedded_newlines(char *p) | |
88 | { | |
89 | if (p == NULL) | |
90 | return; | |
91 | ||
92 | for (; *p; p++) { | |
93 | if (*p == '\n') | |
94 | *p = ' '; | |
95 | } | |
96 | /* Remove trailing whitespace */ | |
97 | if (*--p == ' ') | |
98 | *p = '\0'; | |
99 | } | |
100 | ||
101 | /* | |
102 | * Test specifically for the case where SYSTEM == NONE and AUTH1 contains | |
103 | * anything other than NONE or SYSTEM, which indicates that the admin has | |
104 | * configured the account for purely AUTH1-type authentication. | |
105 | * | |
106 | * Since authenticate() doesn't check AUTH1, and sshd can't sanely support | |
107 | * AUTH1 itself, in such a case authenticate() will allow access without | |
108 | * authentation, which is almost certainly not what the admin intends. | |
109 | * | |
110 | * (The native tools, eg login, will process the AUTH1 list in addition to | |
111 | * the SYSTEM list by using ckuserID(), however ckuserID() and AUTH1 methods | |
112 | * have been deprecated since AIX 4.2.x and would be very difficult for sshd | |
113 | * to support. | |
114 | * | |
115 | * Returns 0 if an unsupportable combination is found, 1 otherwise. | |
116 | */ | |
117 | static int | |
118 | aix_valid_authentications(const char *user) | |
119 | { | |
120 | char *auth1, *sys, *p; | |
121 | int valid = 1; | |
122 | ||
123 | if (getuserattr((char *)user, S_AUTHSYSTEM, &sys, SEC_CHAR) != 0) { | |
124 | logit("Can't retrieve attribute SYSTEM for %s: %.100s", | |
125 | user, strerror(errno)); | |
126 | return 0; | |
127 | } | |
128 | ||
129 | debug3("AIX SYSTEM attribute %s", sys); | |
130 | if (strcmp(sys, "NONE") != 0) | |
131 | return 1; /* not "NONE", so is OK */ | |
132 | ||
133 | if (getuserattr((char *)user, S_AUTH1, &auth1, SEC_LIST) != 0) { | |
134 | logit("Can't retrieve attribute auth1 for %s: %.100s", | |
135 | user, strerror(errno)); | |
136 | return 0; | |
137 | } | |
138 | ||
139 | p = auth1; | |
140 | /* A SEC_LIST is concatenated strings, ending with two NULs. */ | |
141 | while (p[0] != '\0' && p[1] != '\0') { | |
142 | debug3("AIX auth1 attribute list member %s", p); | |
143 | if (strcmp(p, "NONE") != 0 && strcmp(p, "SYSTEM")) { | |
144 | logit("Account %s has unsupported auth1 value '%s'", | |
145 | user, p); | |
146 | valid = 0; | |
147 | } | |
148 | p += strlen(p) + 1; | |
149 | } | |
150 | ||
151 | return (valid); | |
152 | } | |
153 | ||
154 | /* | |
155 | * Do authentication via AIX's authenticate routine. We loop until the | |
156 | * reenter parameter is 0, but normally authenticate is called only once. | |
157 | * | |
158 | * Note: this function returns 1 on success, whereas AIX's authenticate() | |
159 | * returns 0. | |
160 | */ | |
161 | int | |
162 | sys_auth_passwd(Authctxt *ctxt, const char *password) | |
163 | { | |
164 | char *authmsg = NULL, *msg = NULL, *name = ctxt->pw->pw_name; | |
165 | int authsuccess = 0, expired, reenter, result; | |
166 | ||
167 | do { | |
168 | result = authenticate((char *)name, (char *)password, &reenter, | |
169 | &authmsg); | |
170 | aix_remove_embedded_newlines(authmsg); | |
171 | debug3("AIX/authenticate result %d, authmsg %.100s", result, | |
172 | authmsg); | |
173 | } while (reenter); | |
174 | ||
175 | if (!aix_valid_authentications(name)) | |
176 | result = -1; | |
177 | ||
178 | if (result == 0) { | |
179 | authsuccess = 1; | |
180 | ||
181 | /* | |
182 | * Record successful login. We don't have a pty yet, so just | |
183 | * label the line as "ssh" | |
184 | */ | |
185 | aix_setauthdb(name); | |
186 | ||
187 | /* | |
188 | * Check if the user's password is expired. | |
189 | */ | |
190 | expired = passwdexpired(name, &msg); | |
191 | if (msg && *msg) { | |
192 | buffer_append(ctxt->loginmsg, msg, strlen(msg)); | |
193 | aix_remove_embedded_newlines(msg); | |
194 | } | |
195 | debug3("AIX/passwdexpired returned %d msg %.100s", expired, msg); | |
196 | ||
197 | switch (expired) { | |
198 | case 0: /* password not expired */ | |
199 | break; | |
200 | case 1: /* expired, password change required */ | |
201 | ctxt->force_pwchange = 1; | |
202 | break; | |
203 | default: /* user can't change(2) or other error (-1) */ | |
204 | logit("Password can't be changed for user %s: %.100s", | |
205 | name, msg); | |
206 | if (msg) | |
207 | xfree(msg); | |
208 | authsuccess = 0; | |
209 | } | |
210 | ||
211 | aix_restoreauthdb(); | |
212 | } | |
213 | ||
214 | if (authmsg != NULL) | |
215 | xfree(authmsg); | |
216 | ||
217 | return authsuccess; | |
218 | } | |
219 | ||
220 | /* | |
221 | * Check if specified account is permitted to log in. | |
222 | * Returns 1 if login is allowed, 0 if not allowed. | |
223 | */ | |
224 | int | |
225 | sys_auth_allowed_user(struct passwd *pw, Buffer *loginmsg) | |
226 | { | |
227 | char *msg = NULL; | |
228 | int result, permitted = 0; | |
229 | struct stat st; | |
230 | ||
231 | /* | |
232 | * Don't perform checks for root account (PermitRootLogin controls | |
233 | * logins via * ssh) or if running as non-root user (since | |
234 | * loginrestrictions will always fail due to insufficient privilege). | |
235 | */ | |
236 | if (pw->pw_uid == 0 || geteuid() != 0) { | |
237 | debug3("%s: not checking", __func__); | |
238 | return 1; | |
239 | } | |
240 | ||
241 | result = loginrestrictions(pw->pw_name, S_RLOGIN, NULL, &msg); | |
242 | if (result == 0) | |
243 | permitted = 1; | |
244 | /* | |
245 | * If restricted because /etc/nologin exists, the login will be denied | |
246 | * in session.c after the nologin message is sent, so allow for now | |
247 | * and do not append the returned message. | |
248 | */ | |
249 | if (result == -1 && errno == EPERM && stat(_PATH_NOLOGIN, &st) == 0) | |
250 | permitted = 1; | |
251 | else if (msg != NULL) | |
252 | buffer_append(loginmsg, msg, strlen(msg)); | |
253 | if (msg == NULL) | |
254 | msg = xstrdup("(none)"); | |
255 | aix_remove_embedded_newlines(msg); | |
256 | debug3("AIX/loginrestrictions returned %d msg %.100s", result, msg); | |
257 | ||
258 | if (!permitted) | |
259 | logit("Login restricted for %s: %.100s", pw->pw_name, msg); | |
260 | xfree(msg); | |
261 | return permitted; | |
262 | } | |
263 | ||
264 | int | |
265 | sys_auth_record_login(const char *user, const char *host, const char *ttynm, | |
266 | Buffer *loginmsg) | |
267 | { | |
268 | char *msg = NULL; | |
269 | static int msg_done = 0; | |
270 | int success = 0; | |
271 | ||
272 | aix_setauthdb(user); | |
273 | if (loginsuccess((char *)user, (char *)host, (char *)ttynm, &msg) == 0) { | |
274 | success = 1; | |
275 | if (msg != NULL && loginmsg != NULL && !msg_done) { | |
276 | debug("AIX/loginsuccess: msg %s", msg); | |
277 | buffer_append(loginmsg, msg, strlen(msg)); | |
278 | xfree(msg); | |
279 | msg_done = 1; | |
280 | } | |
281 | } | |
282 | aix_restoreauthdb(); | |
283 | return (success); | |
284 | } | |
285 | ||
286 | # ifdef CUSTOM_FAILED_LOGIN | |
287 | /* | |
288 | * record_failed_login: generic "login failed" interface function | |
289 | */ | |
290 | void | |
291 | record_failed_login(const char *user, const char *hostname, const char *ttyname) | |
292 | { | |
293 | if (geteuid() != 0) | |
294 | return; | |
295 | ||
296 | aix_setauthdb(user); | |
297 | # ifdef AIX_LOGINFAILED_4ARG | |
298 | loginfailed((char *)user, (char *)hostname, (char *)ttyname, | |
299 | AUDIT_FAIL_AUTH); | |
300 | # else | |
301 | loginfailed((char *)user, (char *)hostname, (char *)ttyname); | |
302 | # endif | |
303 | aix_restoreauthdb(); | |
304 | } | |
305 | # endif /* CUSTOM_FAILED_LOGIN */ | |
306 | ||
307 | /* | |
308 | * If we have setauthdb, retrieve the password registry for the user's | |
309 | * account then feed it to setauthdb. This will mean that subsequent AIX auth | |
310 | * functions will only use the specified loadable module. If we don't have | |
311 | * setauthdb this is a no-op. | |
312 | */ | |
313 | void | |
314 | aix_setauthdb(const char *user) | |
315 | { | |
316 | # ifdef HAVE_SETAUTHDB | |
317 | char *registry; | |
318 | ||
319 | if (setuserdb(S_READ) == -1) { | |
320 | debug3("%s: Could not open userdb to read", __func__); | |
321 | return; | |
322 | } | |
323 | ||
324 | if (getuserattr((char *)user, S_REGISTRY, ®istry, SEC_CHAR) == 0) { | |
325 | if (setauthdb(registry, old_registry) == 0) | |
326 | debug3("AIX/setauthdb set registry '%s'", registry); | |
327 | else | |
328 | debug3("AIX/setauthdb set registry '%s' failed: %s", | |
329 | registry, strerror(errno)); | |
330 | } else | |
331 | debug3("%s: Could not read S_REGISTRY for user: %s", __func__, | |
332 | strerror(errno)); | |
333 | enduserdb(); | |
334 | # endif /* HAVE_SETAUTHDB */ | |
335 | } | |
336 | ||
337 | /* | |
338 | * Restore the user's registry settings from old_registry. | |
339 | * Note that if the first aix_setauthdb fails, setauthdb("") is still safe | |
340 | * (it restores the system default behaviour). If we don't have setauthdb, | |
341 | * this is a no-op. | |
342 | */ | |
343 | void | |
344 | aix_restoreauthdb(void) | |
345 | { | |
346 | # ifdef HAVE_SETAUTHDB | |
347 | if (setauthdb(old_registry, NULL) == 0) | |
348 | debug3("%s: restoring old registry '%s'", __func__, | |
349 | old_registry); | |
350 | else | |
351 | debug3("%s: failed to restore old registry %s", __func__, | |
352 | old_registry); | |
353 | # endif /* HAVE_SETAUTHDB */ | |
354 | } | |
355 | ||
356 | # endif /* WITH_AIXAUTHENTICATE */ | |
357 | ||
358 | # if defined(AIX_GETNAMEINFO_HACK) && !defined(BROKEN_ADDRINFO) | |
359 | # undef getnameinfo | |
360 | /* | |
361 | * For some reason, AIX's getnameinfo will refuse to resolve the all-zeros | |
362 | * IPv6 address into its textual representation ("::"), so we wrap it | |
363 | * with a function that will. | |
364 | */ | |
365 | int | |
366 | sshaix_getnameinfo(const struct sockaddr *sa, size_t salen, char *host, | |
367 | size_t hostlen, char *serv, size_t servlen, int flags) | |
368 | { | |
369 | struct sockaddr_in6 *sa6; | |
370 | u_int32_t *a6; | |
371 | ||
372 | if (flags & (NI_NUMERICHOST|NI_NUMERICSERV) && | |
373 | sa->sa_family == AF_INET6) { | |
374 | sa6 = (struct sockaddr_in6 *)sa; | |
375 | a6 = sa6->sin6_addr.u6_addr.u6_addr32; | |
376 | ||
377 | if (a6[0] == 0 && a6[1] == 0 && a6[2] == 0 && a6[3] == 0) { | |
378 | strlcpy(host, "::", hostlen); | |
379 | snprintf(serv, servlen, "%d", sa6->sin6_port); | |
380 | return 0; | |
381 | } | |
382 | } | |
383 | return getnameinfo(sa, salen, host, hostlen, serv, servlen, flags); | |
384 | } | |
385 | # endif /* AIX_GETNAMEINFO_HACK */ | |
386 | ||
387 | #endif /* _AIX */ |