3 * Copyright (c) 2001 Gert Doering. All rights reserved.
4 * Copyright (c) 2003,2004,2005 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.
40 #if defined(HAVE_NETDB_H)
47 #include <sys/socket.h>
49 #ifdef WITH_AIXAUTHENTICATE
52 # if defined(HAVE_SYS_AUDIT_H) && defined(AIX_LOGINFAILED_4ARG)
53 # include <sys/audit.h>
60 # ifdef HAVE_SETAUTHDB
61 static char old_registry[REGISTRY_SIZE] = "";
65 * AIX has a "usrinfo" area where logname and other stuff is stored -
66 * a few applications actually use this and die if it's not set
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.
72 aix_usrinfo(struct passwd *pw)
78 len = sizeof("LOGNAME= NAME= ") + (2 * strlen(pw->pw_name));
81 i = snprintf(cp, len, "LOGNAME=%s%cNAME=%s%c", pw->pw_name, '\0',
83 if (usrinfo(SETUINFO, cp, i) == -1)
84 fatal("Couldn't set usrinfo: %s", strerror(errno));
85 debug3("AIX/UsrInfo: set len %d", i);
90 # ifdef WITH_AIXAUTHENTICATE
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.
97 aix_remove_embedded_newlines(char *p)
106 /* Remove trailing whitespace */
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.
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.
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
125 * Returns 0 if an unsupportable combination is found, 1 otherwise.
128 aix_valid_authentications(const char *user)
130 char *auth1, *sys, *p;
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));
139 debug3("AIX SYSTEM attribute %s", sys);
140 if (strcmp(sys, "NONE") != 0)
141 return 1; /* not "NONE", so is OK */
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));
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'",
165 * Do authentication via AIX's authenticate routine. We loop until the
166 * reenter parameter is 0, but normally authenticate is called only once.
168 * Note: this function returns 1 on success, whereas AIX's authenticate()
172 sys_auth_passwd(Authctxt *ctxt, const char *password)
174 char *authmsg = NULL, *msg = NULL, *name = ctxt->pw->pw_name;
175 int authsuccess = 0, expired, reenter, result;
178 result = authenticate((char *)name, (char *)password, &reenter,
180 aix_remove_embedded_newlines(authmsg);
181 debug3("AIX/authenticate result %d, authmsg %.100s", result,
185 if (!aix_valid_authentications(name))
192 * Record successful login. We don't have a pty yet, so just
193 * label the line as "ssh"
198 * Check if the user's password is expired.
200 expired = passwdexpired(name, &msg);
202 buffer_append(ctxt->loginmsg, msg, strlen(msg));
203 aix_remove_embedded_newlines(msg);
205 debug3("AIX/passwdexpired returned %d msg %.100s", expired, msg);
208 case 0: /* password not expired */
210 case 1: /* expired, password change required */
211 ctxt->force_pwchange = 1;
213 default: /* user can't change(2) or other error (-1) */
214 logit("Password can't be changed for user %s: %.100s",
231 * Check if specified account is permitted to log in.
232 * Returns 1 if login is allowed, 0 if not allowed.
235 sys_auth_allowed_user(struct passwd *pw, Buffer *loginmsg)
238 int result, permitted = 0;
242 * Don't perform checks for root account (PermitRootLogin controls
243 * logins via * ssh) or if running as non-root user (since
244 * loginrestrictions will always fail due to insufficient privilege).
246 if (pw->pw_uid == 0 || geteuid() != 0) {
247 debug3("%s: not checking", __func__);
251 result = loginrestrictions(pw->pw_name, S_RLOGIN, NULL, &msg);
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.
259 if (result == -1 && errno == EPERM && stat(_PATH_NOLOGIN, &st) == 0)
261 else if (msg != NULL)
262 buffer_append(loginmsg, msg, strlen(msg));
264 msg = xstrdup("(none)");
265 aix_remove_embedded_newlines(msg);
266 debug3("AIX/loginrestrictions returned %d msg %.100s", result, msg);
269 logit("Login restricted for %s: %.100s", pw->pw_name, msg);
275 sys_auth_record_login(const char *user, const char *host, const char *ttynm,
279 static int msg_done = 0;
283 if (loginsuccess((char *)user, (char *)host, (char *)ttynm, &msg) == 0) {
285 if (msg != NULL && loginmsg != NULL && !msg_done) {
286 debug("AIX/loginsuccess: msg %s", msg);
287 buffer_append(loginmsg, msg, strlen(msg));
296 # ifdef CUSTOM_FAILED_LOGIN
298 * record_failed_login: generic "login failed" interface function
301 record_failed_login(const char *user, const char *hostname, const char *ttyname)
307 # ifdef AIX_LOGINFAILED_4ARG
308 loginfailed((char *)user, (char *)hostname, (char *)ttyname,
311 loginfailed((char *)user, (char *)hostname, (char *)ttyname);
315 # endif /* CUSTOM_FAILED_LOGIN */
318 * If we have setauthdb, retrieve the password registry for the user's
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.
324 aix_setauthdb(const char *user)
326 # ifdef HAVE_SETAUTHDB
329 if (setuserdb(S_READ) == -1) {
330 debug3("%s: Could not open userdb to read", __func__);
334 if (getuserattr((char *)user, S_REGISTRY, ®istry, SEC_CHAR) == 0) {
335 if (setauthdb(registry, old_registry) == 0)
336 debug3("AIX/setauthdb set registry '%s'", registry);
338 debug3("AIX/setauthdb set registry '%s' failed: %s",
339 registry, strerror(errno));
341 debug3("%s: Could not read S_REGISTRY for user: %s", __func__,
344 # endif /* HAVE_SETAUTHDB */
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,
354 aix_restoreauthdb(void)
356 # ifdef HAVE_SETAUTHDB
357 if (setauthdb(old_registry, NULL) == 0)
358 debug3("%s: restoring old registry '%s'", __func__,
361 debug3("%s: failed to restore old registry %s", __func__,
363 # endif /* HAVE_SETAUTHDB */
366 # endif /* WITH_AIXAUTHENTICATE */
368 # if defined(AIX_GETNAMEINFO_HACK) && !defined(BROKEN_ADDRINFO)
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.
376 sshaix_getnameinfo(const struct sockaddr *sa, size_t salen, char *host,
377 size_t hostlen, char *serv, size_t servlen, int flags)
379 struct sockaddr_in6 *sa6;
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;
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);
393 return getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
395 # endif /* AIX_GETNAMEINFO_HACK */