2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
10 #include <afsconfig.h>
11 #include <afs/param.h>
20 #include <sys/param.h>
22 #include <afs/kautils.h>
26 #include <security/pam_appl.h>
27 #include <security/pam_modules.h>
29 #include "afs_message.h"
33 #define RET(x) { retcode = (x); goto out; }
42 int retcode = PAM_SUCCESS;
43 int errcode = PAM_SUCCESS;
46 int logmask = LOG_UPTO(LOG_INFO);
48 int use_first_pass = 0;
49 int try_first_pass = 0;
51 uid_t ignore_uid_id = 0;
52 char my_password_buf[256];
55 * these options are added to handle stupid apps, which won't call
58 int refresh_token = 0;
64 int set_expires = 0; /* This option is only used in pam_set_cred() */
65 int got_authtok = 0; /* got PAM_AUTHTOK upon entry */
66 char *user = NULL, *password = NULL;
67 long password_expires = -1;
68 int torch_password = 1;
70 struct pam_conv *pam_convp = NULL;
72 struct passwd unix_pwd, *upwd = NULL;
73 char upwd_buf[2048]; /* size is a guess. */
77 struct sigaction newAction, origAction;
81 openlog(pam_afs_ident, LOG_CONS|LOG_PID, LOG_AUTH);
83 origmask = setlogmask(logmask);
86 * Parse the user options. Log an error for any unknown options.
88 for (i = 0; i < argc; i++) {
89 if ( strcasecmp(argv[i], "debug" ) == 0) {
90 logmask |= LOG_MASK(LOG_DEBUG);
91 (void) setlogmask(logmask);
92 } else if (strcasecmp(argv[i], "nowarn" ) == 0) {
94 } else if (strcasecmp(argv[i], "use_first_pass") == 0) {
96 } else if (strcasecmp(argv[i], "try_first_pass") == 0) {
98 } else if (strcasecmp(argv[i], "ignore_root" ) == 0) {
101 } else if (strcasecmp(argv[i], "ignore_uid" ) == 0) {
104 pam_afs_syslog(LOG_ERR, PAMAFS_IGNOREUID, "ignore_uid missing argument");
108 ignore_uid_id = (uid_t) strtol(argv[i], (char**)NULL, 10);
109 if ( (ignore_uid_id < 0) || (ignore_uid_id > IGNORE_MAX)) {
111 pam_afs_syslog(LOG_ERR, PAMAFS_IGNOREUID, argv[i]);
114 } else if (strcasecmp(argv[i], "cell") == 0) {
117 pam_afs_syslog(LOG_ERR, PAMAFS_OTHERCELL, "cell missing argument");
120 pam_afs_syslog(LOG_INFO, PAMAFS_OTHERCELL, cell_ptr);
122 } else if (strcasecmp(argv[i], "refresh_token" ) == 0) {
124 } else if (strcasecmp(argv[i], "set_token" ) == 0) {
126 } else if (strcasecmp(argv[i], "dont_fork" ) == 0) {
127 if (!use_klog) dont_fork = 1;
128 else pam_afs_syslog(LOG_ERR, PAMAFS_CONFLICTOPT, "dont_fork");
129 } else if (strcasecmp(argv[i], "use_klog" ) == 0) {
130 if (!dont_fork) use_klog = 1;
131 else pam_afs_syslog(LOG_ERR, PAMAFS_CONFLICTOPT, "use_klog");
132 } else if (strcasecmp(argv[i], "setenv_password_expires") == 0) {
135 pam_afs_syslog(LOG_ERR, PAMAFS_UNKNOWNOPT, argv[i]);
139 /* Later we use try_first_pass to see if we can try again. */
140 /* If use_first_pass is true we don't want to ever try again, */
141 /* so turn that flag off right now. */
142 if (use_first_pass) try_first_pass = 0;
144 if (logmask && LOG_MASK(LOG_DEBUG))
145 pam_afs_syslog(LOG_DEBUG, PAMAFS_OPTIONS, nowarn, use_first_pass, try_first_pass, ignore_uid, ignore_uid_id, refresh_token, set_token, dont_fork, use_klog);
147 /* Try to get the user-interaction info, if available. */
148 errcode = pam_get_item(pamh, PAM_CONV, (const void **) &pam_convp);
149 if (errcode != PAM_SUCCESS) {
150 pam_afs_syslog(LOG_WARNING, PAMAFS_NO_USER_INT);
154 /* Who are we trying to authenticate here? */
155 if ((errcode = pam_get_user(pamh, (const char **)&user, "login: ")) != PAM_SUCCESS) {
156 pam_afs_syslog(LOG_ERR, PAMAFS_NOUSER, errcode);
157 RET(PAM_USER_UNKNOWN);
160 if (logmask && LOG_MASK(LOG_DEBUG))
161 pam_afs_syslog(LOG_DEBUG, PAMAFS_USERNAMEDEBUG, user);
164 * If the user has a "local" (or via nss, possibly nss_dce) pwent,
165 * and its uid==0, and "ignore_root" was given in pam.conf,
168 /* enhanced: use "ignore_uid <number>" to specify the largest uid
169 * which should be ignored by this module
171 #if defined(AFS_HPUX_ENV)
172 #if defined(AFS_HPUX110_ENV)
173 i = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf), &upwd);
174 #else /* AFS_HPUX110_ENV */
175 i = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
176 if ( i == 0 ) /* getpwnam_r success */
178 #endif /* else AFS_HPUX110_ENV */
179 if (ignore_uid && i == 0 && upwd->pw_uid <= ignore_uid_id) {
180 pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
184 #if defined(AFS_LINUX20_ENV) || defined(AFS_FBSD_ENV)
185 upwd = getpwnam(user);
187 upwd = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
189 if (ignore_uid && upwd != NULL && upwd->pw_uid <= ignore_uid_id) {
190 pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
194 errcode = pam_get_item(pamh, PAM_AUTHTOK, (const void **) &password);
195 if (errcode != PAM_SUCCESS || password == NULL) {
196 if (use_first_pass) {
197 pam_afs_syslog(LOG_ERR, PAMAFS_PASSWD_REQ, user);
200 password = NULL; /* In case it isn't already NULL */
201 if (logmask && LOG_MASK(LOG_DEBUG))
202 pam_afs_syslog(LOG_DEBUG, PAMAFS_NOFIRSTPASS, user);
203 } else if (password[0] == '\0') {
204 /* Actually we *did* get one but it was empty. */
206 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
207 RET(PAM_NEW_AUTHTOK_REQD);
209 if (logmask && LOG_MASK(LOG_DEBUG))
210 pam_afs_syslog(LOG_DEBUG, PAMAFS_GOTPASS, user);
214 if (!(use_first_pass || try_first_pass)) {
219 if (password == NULL) {
224 RET(PAM_AUTH_ERR); /* shouldn't happen */
226 try_first_pass = 0; /* we come back if try_first_pass==1 below */
228 if (pam_convp == NULL || pam_convp->conv == NULL) {
229 pam_afs_syslog(LOG_ERR, PAMAFS_CANNOT_PROMPT);
233 errcode = pam_afs_prompt(pam_convp, &password, 0, PAMAFS_PWD_PROMPT);
234 if (errcode != PAM_SUCCESS || password == NULL) {
235 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
238 if (password[0] == '\0') {
239 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
240 RET(PAM_NEW_AUTHTOK_REQD);
244 * We aren't going to free the password later (we will wipe it,
245 * though), because the storage for it if we get it from other
246 * paths may belong to someone else. Since we do need to free
247 * this storage, copy it to a buffer that won't need to be freed
248 * later, and free this storage now.
251 strncpy(my_password_buf, password, sizeof(my_password_buf));
252 my_password_buf[sizeof(my_password_buf)-1] = '\0';
253 memset(password, 0, strlen(password));
255 password = my_password_buf;
259 /* Be sure to allocate a PAG here if we should set a token,
260 * All of the remaining stuff to authenticate the user and to
261 * get a token is done in a child process - if not suppressed by the config,
263 * But dont get a PAG if the refresh_token option was set
264 * We have to do this in such a way because some
265 * apps (such as screensavers) wont call setcred but authenticate :-(
267 if (!refresh_token) {
269 #ifdef AFS_KERBEROS_ENV
272 if (logmask && LOG_MASK(LOG_DEBUG))
273 syslog(LOG_DEBUG, "New PAG created in pam_authenticate()");
277 /* Prepare for fork(): set SIGCHLD signal handler to default */
278 sigemptyset(&newAction.sa_mask);
279 newAction.sa_handler = SIG_DFL;
280 newAction.sa_flags = 0;
281 code = sigaction(SIGCHLD, &newAction, &origAction);
283 pam_afs_syslog(LOG_ERR, PAMAFS_PAMERROR, errno);
287 /* Fork a process and let it verify authentication. So that any
288 * memory/sockets allocated will get cleaned up when the child
289 * exits: defect 11686.
291 if (use_klog) { /* used by kdm 2.x */
292 if (refresh_token || set_token) {
293 i = do_klog(user, password, NULL, cell_ptr);
295 i = do_klog(user, password, "00:00:01", cell_ptr);
296 ktc_ForgetAllTokens();
298 if (logmask && LOG_MASK(LOG_DEBUG))
299 syslog(LOG_DEBUG, "do_klog returned %d", i);
302 if (logmask && LOG_MASK(LOG_DEBUG))
303 syslog(LOG_DEBUG, "forking ...");
305 if (cpid <= 0) { /* The child process */
306 if (logmask && LOG_MASK(LOG_DEBUG))
307 syslog(LOG_DEBUG, "in child");
308 if (refresh_token || set_token)
309 code = ka_UserAuthenticateGeneral(KA_USERAUTH_VERSION,
310 user, /* kerberos name */
312 cell_ptr, /* realm */
313 password, /* password */
314 0, /* default lifetime */
317 &reason /* error string */ );
319 code = ka_VerifyUserPassword(KA_USERAUTH_VERSION,
320 user, /* kerberos name */
322 cell_ptr, /* realm */
323 password, /* password */
325 &reason /* error string */ );
327 pam_afs_syslog(LOG_ERR, PAMAFS_LOGIN_FAILED, user, reason);
332 if (logmask && LOG_MASK(LOG_DEBUG))
333 syslog(LOG_DEBUG, "child: auth_ok=%d", auth_ok);
334 if (cpid == 0) exit(auth_ok);
337 if (logmask && LOG_MASK(LOG_DEBUG))
338 syslog(LOG_DEBUG, "in parent, waiting ...");
339 rcpid = waitpid(cpid, &status, 0);
340 } while ((rcpid == -1) && (errno == EINTR));
342 if ((rcpid == cpid) && WIFEXITED(status)) {
343 auth_ok = WEXITSTATUS(status);
347 if (logmask && LOG_MASK(LOG_DEBUG))
348 syslog(LOG_DEBUG, "parent: auth_ok=%d", auth_ok);
351 /* Restore old signal handler */
352 code = sigaction(SIGCHLD, &origAction, NULL);
354 pam_afs_syslog(LOG_ERR, PAMAFS_PAMERROR, errno);
356 } else { /* dont_fork, used by httpd */
357 if (logmask && LOG_MASK(LOG_DEBUG))
358 syslog(LOG_DEBUG, "dont_fork");
359 if (refresh_token || set_token)
360 code = ka_UserAuthenticateGeneral(KA_USERAUTH_VERSION,
361 user, /* kerberos name */
363 cell_ptr, /* realm */
364 password, /* password */
365 0, /* default lifetime */
368 &reason /* error string */ );
370 code = ka_VerifyUserPassword(KA_USERAUTH_VERSION,
371 user, /* kerberos name */
373 cell_ptr, /* realm */
374 password, /* password */
376 &reason /* error string */ );
377 if (logmask && LOG_MASK(LOG_DEBUG))
378 syslog(LOG_DEBUG, "dont_fork, code = %d",code);
380 pam_afs_syslog(LOG_ERR, PAMAFS_LOGIN_FAILED, user, reason);
385 if (logmask && LOG_MASK(LOG_DEBUG))
386 syslog(LOG_DEBUG, "dont_fork: auth_ok=%d", auth_ok);
389 if (!auth_ok && try_first_pass) {
394 /* We don't care if this fails; all we can do is try. */
395 /* It is not reasonable to store the password only if it was correct
396 * because it could satisfy another module that is called in the chain
401 (void) pam_set_item(pamh, PAM_AUTHTOK, password);
404 if (logmask && LOG_MASK(LOG_DEBUG))
405 syslog(LOG_DEBUG, "leaving auth: auth_ok=%d", auth_ok);
406 if (code == KANOENT) RET(PAM_USER_UNKNOWN);
407 RET(auth_ok ? PAM_SUCCESS : PAM_AUTH_ERR);
412 /* we store the password in the data portion */
413 char* tmp = strdup(password);
414 (void) pam_set_data(pamh, pam_afs_lh, tmp, lc_cleanup);
415 if ( torch_password) memset(password, 0, strlen(password));
417 (void) setlogmask(origmask);
418 #ifndef AFS_SUN56_ENV