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.
37 #include <sys/socket.h>
40 # ifdef HAVE_SETAUTHDB
41 static char old_registry[REGISTRY_SIZE] = "";
45 * AIX has a "usrinfo" area where logname and other stuff is stored -
46 * a few applications actually use this and die if it's not set
48 * NOTE: TTY= should be set, but since no one uses it and it's hard to
49 * acquire due to privsep code. We will just drop support.
52 aix_usrinfo(struct passwd *pw)
58 len = sizeof("LOGNAME= NAME= ") + (2 * strlen(pw->pw_name));
61 i = snprintf(cp, len, "LOGNAME=%s%cNAME=%s%c", pw->pw_name, '\0',
63 if (usrinfo(SETUINFO, cp, i) == -1)
64 fatal("Couldn't set usrinfo: %s", strerror(errno));
65 debug3("AIX/UsrInfo: set len %d", i);
70 # ifdef WITH_AIXAUTHENTICATE
72 * Remove embedded newlines in string (if any).
73 * Used before logging messages returned by AIX authentication functions
74 * so the message is logged on one line.
77 aix_remove_embedded_newlines(char *p)
86 /* Remove trailing whitespace */
92 * Test specifically for the case where SYSTEM == NONE and AUTH1 contains
93 * anything other than NONE or SYSTEM, which indicates that the admin has
94 * configured the account for purely AUTH1-type authentication.
96 * Since authenticate() doesn't check AUTH1, and sshd can't sanely support
97 * AUTH1 itself, in such a case authenticate() will allow access without
98 * authentation, which is almost certainly not what the admin intends.
100 * (The native tools, eg login, will process the AUTH1 list in addition to
101 * the SYSTEM list by using ckuserID(), however ckuserID() and AUTH1 methods
102 * have been deprecated since AIX 4.2.x and would be very difficult for sshd
105 * Returns 0 if an unsupportable combination is found, 1 otherwise.
108 aix_valid_authentications(const char *user)
110 char *auth1, *sys, *p;
113 if (getuserattr((char *)user, S_AUTHSYSTEM, &sys, SEC_CHAR) != 0) {
114 logit("Can't retrieve attribute SYSTEM for %s: %.100s",
115 user, strerror(errno));
119 debug3("AIX SYSTEM attribute %s", sys);
120 if (strcmp(sys, "NONE") != 0)
121 return 1; /* not "NONE", so is OK */
123 if (getuserattr((char *)user, S_AUTH1, &auth1, SEC_LIST) != 0) {
124 logit("Can't retrieve attribute auth1 for %s: %.100s",
125 user, strerror(errno));
130 /* A SEC_LIST is concatenated strings, ending with two NULs. */
131 while (p[0] != '\0' && p[1] != '\0') {
132 debug3("AIX auth1 attribute list member %s", p);
133 if (strcmp(p, "NONE") != 0 && strcmp(p, "SYSTEM")) {
134 logit("Account %s has unsupported auth1 value '%s'",
145 * Do authentication via AIX's authenticate routine. We loop until the
146 * reenter parameter is 0, but normally authenticate is called only once.
148 * Note: this function returns 1 on success, whereas AIX's authenticate()
152 sys_auth_passwd(Authctxt *ctxt, const char *password)
154 char *authmsg = NULL, *msg = NULL, *name = ctxt->pw->pw_name;
155 int authsuccess = 0, expired, reenter, result;
158 result = authenticate((char *)name, (char *)password, &reenter,
160 aix_remove_embedded_newlines(authmsg);
161 debug3("AIX/authenticate result %d, authmsg %.100s", result,
165 if (!aix_valid_authentications(name))
172 * Record successful login. We don't have a pty yet, so just
173 * label the line as "ssh"
178 * Check if the user's password is expired.
180 expired = passwdexpired(name, &msg);
182 buffer_append(ctxt->loginmsg, msg, strlen(msg));
183 aix_remove_embedded_newlines(msg);
185 debug3("AIX/passwdexpired returned %d msg %.100s", expired, msg);
188 case 0: /* password not expired */
190 case 1: /* expired, password change required */
191 ctxt->force_pwchange = 1;
193 default: /* user can't change(2) or other error (-1) */
194 logit("Password can't be changed for user %s: %.100s",
211 * Check if specified account is permitted to log in.
212 * Returns 1 if login is allowed, 0 if not allowed.
215 sys_auth_allowed_user(struct passwd *pw, Buffer *loginmsg)
218 int result, permitted = 0;
222 * Don't perform checks for root account (PermitRootLogin controls
223 * logins via * ssh) or if running as non-root user (since
224 * loginrestrictions will always fail due to insufficient privilege).
226 if (pw->pw_uid == 0 || geteuid() != 0) {
227 debug3("%s: not checking", __func__);
231 result = loginrestrictions(pw->pw_name, S_RLOGIN, NULL, &msg);
235 * If restricted because /etc/nologin exists, the login will be denied
236 * in session.c after the nologin message is sent, so allow for now
237 * and do not append the returned message.
239 if (result == -1 && errno == EPERM && stat(_PATH_NOLOGIN, &st) == 0)
241 else if (msg != NULL)
242 buffer_append(loginmsg, msg, strlen(msg));
244 msg = xstrdup("(none)");
245 aix_remove_embedded_newlines(msg);
246 debug3("AIX/loginrestrictions returned %d msg %.100s", result, msg);
249 logit("Login restricted for %s: %.100s", pw->pw_name, msg);
255 sys_auth_record_login(const char *user, const char *host, const char *ttynm,
262 if (loginsuccess((char *)user, (char *)host, (char *)ttynm, &msg) == 0) {
265 debug("AIX/loginsuccess: msg %s", msg);
266 buffer_append(loginmsg, msg, strlen(msg));
274 # ifdef CUSTOM_FAILED_LOGIN
276 * record_failed_login: generic "login failed" interface function
279 record_failed_login(const char *user, const char *hostname, const char *ttyname)
285 # ifdef AIX_LOGINFAILED_4ARG
286 loginfailed((char *)user, (char *)hostname, (char *)ttyname,
289 loginfailed((char *)user, (char *)hostname, (char *)ttyname);
293 # endif /* CUSTOM_FAILED_LOGIN */
296 * If we have setauthdb, retrieve the password registry for the user's
297 * account then feed it to setauthdb. This will mean that subsequent AIX auth
298 * functions will only use the specified loadable module. If we don't have
299 * setauthdb this is a no-op.
302 aix_setauthdb(const char *user)
304 # ifdef HAVE_SETAUTHDB
307 if (setuserdb(S_READ) == -1) {
308 debug3("%s: Could not open userdb to read", __func__);
312 if (getuserattr((char *)user, S_REGISTRY, ®istry, SEC_CHAR) == 0) {
313 if (setauthdb(registry, old_registry) == 0)
314 debug3("AIX/setauthdb set registry '%s'", registry);
316 debug3("AIX/setauthdb set registry '%s' failed: %s",
317 registry, strerror(errno));
319 debug3("%s: Could not read S_REGISTRY for user: %s", __func__,
322 # endif /* HAVE_SETAUTHDB */
326 * Restore the user's registry settings from old_registry.
327 * Note that if the first aix_setauthdb fails, setauthdb("") is still safe
328 * (it restores the system default behaviour). If we don't have setauthdb,
332 aix_restoreauthdb(void)
334 # ifdef HAVE_SETAUTHDB
335 if (setauthdb(old_registry, NULL) == 0)
336 debug3("%s: restoring old registry '%s'", __func__,
339 debug3("%s: failed to restore old registry %s", __func__,
341 # endif /* HAVE_SETAUTHDB */
344 # endif /* WITH_AIXAUTHENTICATE */
346 # if defined(AIX_GETNAMEINFO_HACK) && !defined(BROKEN_ADDRINFO)
349 * For some reason, AIX's getnameinfo will refuse to resolve the all-zeros
350 * IPv6 address into its textual representation ("::"), so we wrap it
351 * with a function that will.
354 sshaix_getnameinfo(const struct sockaddr *sa, size_t salen, char *host,
355 size_t hostlen, char *serv, size_t servlen, int flags)
357 struct sockaddr_in6 *sa6;
360 if (flags & (NI_NUMERICHOST|NI_NUMERICSERV) &&
361 sa->sa_family == AF_INET6) {
362 sa6 = (struct sockaddr_in6 *)sa;
363 a6 = sa6->sin6_addr.u6_addr.u6_addr32;
365 if (a6[0] == 0 && a6[1] == 0 && a6[2] == 0 && a6[3] == 0) {
366 strlcpy(host, "::", hostlen);
367 snprintf(serv, servlen, "%d", sa6->sin6_port);
371 return getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
373 # endif /* AIX_GETNAMEINFO_HACK */