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 <security/pam_appl.h>
11 #include <security/pam_modules.h>
18 #include <afsconfig.h>
19 #include <afs/param.h>
23 #include <sys/param.h>
24 #include <afs/kautils.h>
25 #include "afs_message.h"
30 #define RET(x) { retcode = (x); goto out; }
32 #if defined(AFS_KERBEROS_ENV)
33 extern char *ktc_tkt_string();
43 int retcode = PAM_SUCCESS;
44 int errcode = PAM_SUCCESS;
46 int logmask = LOG_UPTO(LOG_INFO);
48 int use_first_pass = 1; /* use the password passed in by auth */
49 int try_first_pass = 0;
53 uid_t ignore_uid_id = 0;
54 int refresh_token = 0;
55 int set_expires = 0; /* the default is to not to set the env variable */
58 struct pam_conv *pam_convp = NULL;
59 char my_password_buf[256];
62 char *password = NULL;
63 int torch_password = 1;
67 long password_expires= -1;
69 struct passwd unix_pwd, *upwd = NULL;
70 char upwd_buf[2048]; /* size is a guess. */
73 openlog(pam_afs_ident, LOG_CONS, LOG_AUTH);
75 origmask = setlogmask(logmask);
78 * Parse the user options. Log an error for any unknown options.
80 for (i = 0; i < argc; i++) {
81 if ( strcasecmp(argv[i], "debug" ) == 0) {
82 logmask |= LOG_MASK(LOG_DEBUG);
83 (void) setlogmask(logmask);
84 } else if (strcasecmp(argv[i], "nowarn" ) == 0) {
86 } else if (strcasecmp(argv[i], "use_first_pass") == 0) {
87 use_first_pass = 1; /* practically redundant */
88 } else if (strcasecmp(argv[i], "try_first_pass") == 0) {
90 } else if (strcasecmp(argv[i], "ignore_root" ) == 0) {
93 } else if (strcasecmp(argv[i], "ignore_uid" ) == 0) {
96 pam_afs_syslog(LOG_ERR, PAMAFS_IGNOREUID, "ignore_uid missing argument");
100 ignore_uid_id = (uid_t) strtol(argv[i], (char**)NULL, 10);
101 if ( (0 > ignore_uid_id) || (ignore_uid_id > IGNORE_MAX) ) {
103 pam_afs_syslog(LOG_ERR, PAMAFS_IGNOREUID, argv[i]);
106 } else if (strcasecmp(argv[i], "cell") == 0) {
109 pam_afs_syslog(LOG_ERR, PAMAFS_OTHERCELL, "cell missing argument");
112 pam_afs_syslog(LOG_INFO, PAMAFS_OTHERCELL, cell_ptr);
114 } else if (strcasecmp(argv[i], "no_unlog") == 0) {
116 } else if (strcasecmp(argv[i], "refresh_token" ) == 0) {
118 } else if (strcasecmp(argv[i], "set_token" ) == 0) {
120 } else if (strcasecmp(argv[i], "dont_fork" ) == 0) {
122 } else if (strcasecmp(argv[i], "use_klog" ) == 0) {
124 } else if (strcasecmp(argv[i], "setenv_password_expires")==0) {
127 pam_afs_syslog(LOG_ERR, PAMAFS_UNKNOWNOPT, argv[i]);
131 if (use_first_pass) try_first_pass = 0;
133 if (logmask && LOG_MASK(LOG_DEBUG))
134 pam_afs_syslog(LOG_DEBUG, PAMAFS_OPTIONS, nowarn, use_first_pass, try_first_pass, ignore_uid, ignore_uid_id, 8, 8, 8, 8);
135 /* Try to get the user-interaction info, if available. */
136 errcode = pam_get_item(pamh, PAM_CONV, (const void **) &pam_convp);
137 if (errcode != PAM_SUCCESS) {
138 if (logmask && LOG_MASK(LOG_DEBUG))
139 pam_afs_syslog(LOG_DEBUG, PAMAFS_NO_USER_INT);
143 /* Who are we trying to authenticate here? */
144 if ((errcode = pam_get_user(pamh, (const char **)&user, "AFS username:")) != PAM_SUCCESS) {
145 pam_afs_syslog(LOG_ERR, PAMAFS_NOUSER, errcode);
146 RET(PAM_USER_UNKNOWN);
149 * If the user has a "local" (or via nss, possibly nss_dce) pwent,
150 * and its uid==0, and "ignore_root" was given in pam.conf,
153 /* enhanced: use "ignore_uid <number>" to specify the largest uid
154 * which should be ignored by this module
156 #if defined(AFS_HPUX_ENV)
157 #if defined(AFS_HPUX110_ENV)
158 i = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf), &upwd);
159 #else /* AFS_HPUX110_ENV */
160 i = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
161 if ( i == 0 ) /* getpwnam_r success */
163 #endif /* AFS_HPUX110_ENV */
164 if (ignore_uid && i == 0 && upwd->pw_uid <= ignore_uid_id) {
165 pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
169 #if defined(AFS_LINUX20_ENV) || defined(AFS_FBSD_ENV)
170 upwd = getpwnam(user);
172 upwd = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
174 if (ignore_uid && upwd != NULL && upwd->pw_uid <= ignore_uid_id) {
175 pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
180 if (flags & PAM_DELETE_CRED) {
181 if (logmask && LOG_MASK(LOG_DEBUG))
182 pam_afs_syslog(LOG_DEBUG, PAMAFS_DELCRED, user);
185 } else if (flags & PAM_REINITIALIZE_CRED) {
187 if (logmask && LOG_MASK(LOG_DEBUG))
188 pam_afs_syslog(LOG_DEBUG, PAMAFS_REINITCRED, user);
191 } else { /* flags are PAM_REFRESH_CRED, PAM_ESTABLISH_CRED, unknown */
193 if (logmask && LOG_MASK(LOG_DEBUG))
194 pam_afs_syslog(LOG_DEBUG, PAMAFS_ESTABCRED, user);
196 errcode = pam_get_data(pamh, pam_afs_lh, (const void **) &password);
197 if (errcode != PAM_SUCCESS || password == NULL) {
198 if (use_first_pass) {
199 pam_afs_syslog(LOG_ERR, PAMAFS_PASSWD_REQ, user);
202 password = NULL; /* In case it isn't already NULL */
203 if (logmask && LOG_MASK(LOG_DEBUG))
204 pam_afs_syslog(LOG_DEBUG, PAMAFS_NOFIRSTPASS, user);
205 } else if (password[0] == '\0') {
206 /* Actually we *did* get one but it was empty. */
209 /* So don't use it. */
211 if (use_first_pass) {
212 pam_afs_syslog(LOG_ERR, PAMAFS_PASSWD_REQ, user);
213 RET(PAM_NEW_AUTHTOK_REQD);
215 if (logmask && LOG_MASK(LOG_DEBUG))
216 pam_afs_syslog(LOG_DEBUG, PAMAFS_NILPASSWORD, user);
218 if (logmask && LOG_MASK(LOG_DEBUG))
219 pam_afs_syslog(LOG_DEBUG, PAMAFS_GOTPASS, user);
223 if (!(use_first_pass || try_first_pass)) {
228 if (password == NULL) {
233 RET(PAM_AUTH_ERR); /* shouldn't happen */
235 try_first_pass = 0; /* we come back if try_first_pass==1 below */
237 if (pam_convp == NULL || pam_convp->conv == NULL) {
238 pam_afs_syslog(LOG_ERR, PAMAFS_CANNOT_PROMPT);
242 errcode = pam_afs_prompt(pam_convp, &password, 0, PAMAFS_PWD_PROMPT);
243 if (errcode != PAM_SUCCESS || password == NULL) {
244 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
247 if (password[0] == '\0') {
248 if (logmask && LOG_MASK(LOG_DEBUG))
249 pam_afs_syslog(LOG_DEBUG, PAMAFS_NILPASSWORD);
250 RET(PAM_NEW_AUTHTOK_REQD);
253 * We aren't going to free the password later (we will wipe it,
254 * though), because the storage for it if we get it from other
255 * paths may belong to someone else. Since we do need to free
256 * this storage, copy it to a buffer that won't need to be freed
257 * later, and free this storage now.
260 strncpy(my_password_buf, password, sizeof(my_password_buf));
261 my_password_buf[sizeof(my_password_buf)-1] = '\0';
262 memset(password, 0, strlen(password));
264 password = my_password_buf;
267 * We only set a PAG here, if we haven't got one before in
268 * pam_sm_authenticate() or if it was destroyed by the application
270 if ((!refresh_token) && (getPAG() == -1)) {
271 if (logmask && LOG_MASK(LOG_DEBUG))
272 syslog(LOG_DEBUG, "New PAG created in pam_setcred()");
274 #ifdef AFS_KERBEROS_ENV
279 if ( flags & PAM_REFRESH_CRED ) {
281 auth_ok = ! do_klog(user, password, "00:00:01", cell_ptr);
282 ktc_ForgetAllTokens();
284 if ( ka_VerifyUserPassword(
286 user, /* kerberos name */
288 cell_ptr, /* realm */
289 password, /* password */
291 &reason /* error string */
293 pam_afs_syslog(LOG_ERR, PAMAFS_LOGIN_FAILED, user, reason);
300 if ( flags & PAM_ESTABLISH_CRED ) {
301 if (use_klog) auth_ok = ! do_klog(user, password, NULL, cell_ptr);
303 if ( ka_UserAuthenticateGeneral(
305 user, /* kerberos name */
307 cell_ptr, /* realm */
308 password, /* password */
309 0, /* default lifetime */
312 &reason /* error string */
314 pam_afs_syslog(LOG_ERR, PAMAFS_LOGIN_FAILED, user, reason);
321 if (!auth_ok && try_first_pass) {
326 /* pam_sm_authenticate should have set this
327 * if (auth_ok && !got_authtok) {
328 * torch_password = 0;
329 * (void) pam_set_item(pamh, PAM_AUTHTOK, password);
334 if (set_expires && !use_klog && (password_expires >= 0) ) {
335 strcpy(sbuffer, "PASSWORD_EXPIRES=");
336 strcat(sbuffer, cv2string(&sbuffer[100], password_expires));
337 errcode = pam_putenv( pamh, sbuffer);
338 if ( errcode != PAM_SUCCESS )
339 pam_afs_syslog(LOG_ERR, PAMAFS_PASSEXPFAIL, user);
341 #if defined(AFS_KERBEROS_ENV)
343 if ( chown(ktc_tkt_string(), upwd->pw_uid, upwd->pw_gid) < 0 )
344 pam_afs_syslog(LOG_ERR, PAMAFS_CHOWNKRB, user);
345 sprintf(sbuffer, "KRBTKFILE=%s", ktc_tkt_string());
346 errcode = pam_putenv( pamh, sbuffer);
347 if ( errcode != PAM_SUCCESS )
348 pam_afs_syslog(LOG_ERR, PAMAFS_KRBFAIL, user);
359 if (password && torch_password) memset(password, 0, strlen(password));
360 (void) setlogmask(origmask);
361 #ifndef AFS_SUN56_ENV