3 * Copyright (c) 2001 Gert Doering. All rights reserved.
4 * Copyright (c) 2003,2004,2005,2006 Darren Tucker. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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.
42 #if defined(HAVE_NETDB_H)
49 #include <sys/socket.h>
51 #ifdef WITH_AIXAUTHENTICATE
54 # if defined(HAVE_SYS_AUDIT_H) && defined(AIX_LOGINFAILED_4ARG)
55 # include <sys/audit.h>
62 static char *lastlogin_msg = NULL;
64 # ifdef HAVE_SETAUTHDB
65 static char old_registry[REGISTRY_SIZE] = "";
69 * AIX has a "usrinfo" area where logname and other stuff is stored -
70 * a few applications actually use this and die if it's not set
72 * NOTE: TTY= should be set, but since no one uses it and it's hard to
73 * acquire due to privsep code. We will just drop support.
76 aix_usrinfo(struct passwd *pw)
82 len = sizeof("LOGNAME= NAME= ") + (2 * strlen(pw->pw_name));
85 i = snprintf(cp, len, "LOGNAME=%s%cNAME=%s%c", pw->pw_name, '\0',
87 if (usrinfo(SETUINFO, cp, i) == -1)
88 fatal("Couldn't set usrinfo: %s", strerror(errno));
89 debug3("AIX/UsrInfo: set len %d", i);
94 # ifdef WITH_AIXAUTHENTICATE
96 * Remove embedded newlines in string (if any).
97 * Used before logging messages returned by AIX authentication functions
98 * so the message is logged on one line.
101 aix_remove_embedded_newlines(char *p)
110 /* Remove trailing whitespace */
116 * Test specifically for the case where SYSTEM == NONE and AUTH1 contains
117 * anything other than NONE or SYSTEM, which indicates that the admin has
118 * configured the account for purely AUTH1-type authentication.
120 * Since authenticate() doesn't check AUTH1, and sshd can't sanely support
121 * AUTH1 itself, in such a case authenticate() will allow access without
122 * authentation, which is almost certainly not what the admin intends.
124 * (The native tools, eg login, will process the AUTH1 list in addition to
125 * the SYSTEM list by using ckuserID(), however ckuserID() and AUTH1 methods
126 * have been deprecated since AIX 4.2.x and would be very difficult for sshd
129 * Returns 0 if an unsupportable combination is found, 1 otherwise.
132 aix_valid_authentications(const char *user)
134 char *auth1, *sys, *p;
137 if (getuserattr((char *)user, S_AUTHSYSTEM, &sys, SEC_CHAR) != 0) {
138 logit("Can't retrieve attribute SYSTEM for %s: %.100s",
139 user, strerror(errno));
143 debug3("AIX SYSTEM attribute %s", sys);
144 if (strcmp(sys, "NONE") != 0)
145 return 1; /* not "NONE", so is OK */
147 if (getuserattr((char *)user, S_AUTH1, &auth1, SEC_LIST) != 0) {
148 logit("Can't retrieve attribute auth1 for %s: %.100s",
149 user, strerror(errno));
154 /* A SEC_LIST is concatenated strings, ending with two NULs. */
155 while (p[0] != '\0' && p[1] != '\0') {
156 debug3("AIX auth1 attribute list member %s", p);
157 if (strcmp(p, "NONE") != 0 && strcmp(p, "SYSTEM")) {
158 logit("Account %s has unsupported auth1 value '%s'",
169 * Do authentication via AIX's authenticate routine. We loop until the
170 * reenter parameter is 0, but normally authenticate is called only once.
172 * Note: this function returns 1 on success, whereas AIX's authenticate()
176 sys_auth_passwd(struct ssh *ssh, const char *password)
178 Authctxt *ctxt = ssh->authctxt;
179 char *authmsg = NULL, *msg = NULL, *name = ctxt->pw->pw_name;
180 int r, authsuccess = 0, expired, reenter, result;
183 result = authenticate((char *)name, (char *)password, &reenter,
185 aix_remove_embedded_newlines(authmsg);
186 debug3("AIX/authenticate result %d, authmsg %.100s", result,
190 if (!aix_valid_authentications(name))
197 * Record successful login. We don't have a pty yet, so just
198 * label the line as "ssh"
203 * Check if the user's password is expired.
205 expired = passwdexpired(name, &msg);
207 if ((r = sshbuf_put(ctxt->loginmsg,
208 msg, strlen(msg))) != 0)
209 fatal("%s: buffer error: %s",
210 __func__, ssh_err(r));
211 aix_remove_embedded_newlines(msg);
213 debug3("AIX/passwdexpired returned %d msg %.100s", expired, msg);
216 case 0: /* password not expired */
218 case 1: /* expired, password change required */
219 ctxt->force_pwchange = 1;
221 default: /* user can't change(2) or other error (-1) */
222 logit("Password can't be changed for user %s: %.100s",
237 * Check if specified account is permitted to log in.
238 * Returns 1 if login is allowed, 0 if not allowed.
241 sys_auth_allowed_user(struct passwd *pw, struct sshbuf *loginmsg)
244 int r, result, permitted = 0;
248 * Don't perform checks for root account (PermitRootLogin controls
249 * logins via ssh) or if running as non-root user (since
250 * loginrestrictions will always fail due to insufficient privilege).
252 if (pw->pw_uid == 0 || geteuid() != 0) {
253 debug3("%s: not checking", __func__);
257 result = loginrestrictions(pw->pw_name, S_RLOGIN, NULL, &msg);
261 * If restricted because /etc/nologin exists, the login will be denied
262 * in session.c after the nologin message is sent, so allow for now
263 * and do not append the returned message.
265 if (result == -1 && errno == EPERM && stat(_PATH_NOLOGIN, &st) == 0)
267 else if (msg != NULL) {
268 if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
269 fatal("%s: buffer error: %s", __func__, ssh_err(r));
272 msg = xstrdup("(none)");
273 aix_remove_embedded_newlines(msg);
274 debug3("AIX/loginrestrictions returned %d msg %.100s", result, msg);
277 logit("Login restricted for %s: %.100s", pw->pw_name, msg);
283 sys_auth_record_login(const char *user, const char *host, const char *ttynm,
284 struct sshbuf *loginmsg)
290 if (loginsuccess((char *)user, (char *)host, (char *)ttynm, &msg) == 0) {
293 debug("AIX/loginsuccess: msg %s", msg);
294 if (lastlogin_msg == NULL)
303 sys_auth_get_lastlogin_msg(const char *user, uid_t uid)
305 char *msg = lastlogin_msg;
307 lastlogin_msg = NULL;
311 # ifdef CUSTOM_FAILED_LOGIN
313 * record_failed_login: generic "login failed" interface function
316 record_failed_login(const char *user, const char *hostname, const char *ttyname)
322 # ifdef AIX_LOGINFAILED_4ARG
323 loginfailed((char *)user, (char *)hostname, (char *)ttyname,
326 loginfailed((char *)user, (char *)hostname, (char *)ttyname);
330 # endif /* CUSTOM_FAILED_LOGIN */
333 * If we have setauthdb, retrieve the password registry for the user's
334 * account then feed it to setauthdb. This will mean that subsequent AIX auth
335 * functions will only use the specified loadable module. If we don't have
336 * setauthdb this is a no-op.
339 aix_setauthdb(const char *user)
341 # ifdef HAVE_SETAUTHDB
344 if (setuserdb(S_READ) == -1) {
345 debug3("%s: Could not open userdb to read", __func__);
349 if (getuserattr((char *)user, S_REGISTRY, ®istry, SEC_CHAR) == 0) {
350 if (setauthdb(registry, old_registry) == 0)
351 debug3("AIX/setauthdb set registry '%s'", registry);
353 debug3("AIX/setauthdb set registry '%s' failed: %s",
354 registry, strerror(errno));
356 debug3("%s: Could not read S_REGISTRY for user: %s", __func__,
359 # endif /* HAVE_SETAUTHDB */
363 * Restore the user's registry settings from old_registry.
364 * Note that if the first aix_setauthdb fails, setauthdb("") is still safe
365 * (it restores the system default behaviour). If we don't have setauthdb,
369 aix_restoreauthdb(void)
371 # ifdef HAVE_SETAUTHDB
372 if (setauthdb(old_registry, NULL) == 0)
373 debug3("%s: restoring old registry '%s'", __func__,
376 debug3("%s: failed to restore old registry %s", __func__,
378 # endif /* HAVE_SETAUTHDB */
381 # endif /* WITH_AIXAUTHENTICATE */
383 # ifdef USE_AIX_KRB_NAME
385 * aix_krb5_get_principal_name: returns the user's kerberos client principal name if
386 * configured, otherwise NULL. Caller must free returned string.
389 aix_krb5_get_principal_name(char *pw_name)
391 char *authname = NULL, *authdomain = NULL, *principal = NULL;
394 if (getuserattr(pw_name, S_AUTHDOMAIN, &authdomain, SEC_CHAR) != 0)
395 debug("AIX getuserattr S_AUTHDOMAIN: %s", strerror(errno));
396 if (getuserattr(pw_name, S_AUTHNAME, &authname, SEC_CHAR) != 0)
397 debug("AIX getuserattr S_AUTHNAME: %s", strerror(errno));
399 if (authdomain != NULL)
400 xasprintf(&principal, "%s@%s", authname ? authname : pw_name, authdomain);
401 else if (authname != NULL)
402 principal = xstrdup(authname);
406 # endif /* USE_AIX_KRB_NAME */
408 # if defined(AIX_GETNAMEINFO_HACK) && !defined(BROKEN_ADDRINFO)
411 * For some reason, AIX's getnameinfo will refuse to resolve the all-zeros
412 * IPv6 address into its textual representation ("::"), so we wrap it
413 * with a function that will.
416 sshaix_getnameinfo(const struct sockaddr *sa, size_t salen, char *host,
417 size_t hostlen, char *serv, size_t servlen, int flags)
419 struct sockaddr_in6 *sa6;
422 if (flags & (NI_NUMERICHOST|NI_NUMERICSERV) &&
423 sa->sa_family == AF_INET6) {
424 sa6 = (struct sockaddr_in6 *)sa;
425 a6 = sa6->sin6_addr.u6_addr.u6_addr32;
427 if (a6[0] == 0 && a6[1] == 0 && a6[2] == 0 && a6[3] == 0) {
428 strlcpy(host, "::", hostlen);
429 snprintf(serv, servlen, "%d", sa6->sin6_port);
433 return getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
435 # endif /* AIX_GETNAMEINFO_HACK */
437 # if defined(USE_GETGRSET)
440 getgrouplist(const char *user, gid_t pgid, gid_t *groups, int *grpcnt)
442 char *cp, *grplist, *grp;
444 int ret = 0, ngroups = 0, maxgroups;
449 if ((cp = grplist = getgrset(user)) == NULL)
452 /* handle zero-length case */
453 if (maxgroups <= 0) {
458 /* copy primary group */
459 groups[ngroups++] = pgid;
461 /* copy each entry from getgrset into group list */
462 while ((grp = strsep(&grplist, ",")) != NULL) {
463 l = strtol(grp, NULL, 10);
464 if (ngroups >= maxgroups || l == LONG_MIN || l == LONG_MAX) {
470 continue; /* we have already added primary gid */
471 groups[ngroups++] = gid;
478 # endif /* USE_GETGRSET */