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>
15 #include <security/pam_appl.h>
16 #include <security/pam_modules.h>
18 #include <afs/kautils.h>
20 #include "afs_message.h"
25 #define RET(x) { retcode = (x); goto out; }
27 #if defined(AFS_KERBEROS_ENV)
28 extern char *ktc_tkt_string();
32 pam_sm_setcred(pam_handle_t * pamh, int flags, int argc, const char **argv)
34 int retcode = PAM_SUCCESS;
35 int errcode = PAM_SUCCESS;
37 int logmask = LOG_UPTO(LOG_INFO);
39 int use_first_pass = 1; /* use the password passed in by auth */
40 int try_first_pass = 0;
44 uid_t ignore_uid_id = 0;
45 int refresh_token = 0;
46 int set_expires = 0; /* the default is to not to set the env variable */
49 PAM_CONST struct pam_conv *pam_convp = NULL;
50 char my_password_buf[256];
51 char *cell_ptr = NULL;
53 char *password = NULL;
54 int torch_password = 1;
57 PAM_CONST char *user = NULL;
58 int password_expires = -1;
60 struct passwd unix_pwd, *upwd = NULL;
61 char upwd_buf[2048]; /* size is a guess. */
64 openlog(pam_afs_ident, LOG_CONS, LOG_AUTH);
66 origmask = setlogmask(logmask);
69 * Parse the user options. Log an error for any unknown options.
71 for (i = 0; i < argc; i++) {
72 if (strcasecmp(argv[i], "debug") == 0) {
73 logmask |= LOG_MASK(LOG_DEBUG);
74 (void)setlogmask(logmask);
75 } else if (strcasecmp(argv[i], "nowarn") == 0) {
77 } else if (strcasecmp(argv[i], "use_first_pass") == 0) {
78 use_first_pass = 1; /* practically redundant */
79 } else if (strcasecmp(argv[i], "try_first_pass") == 0) {
81 } else if (strcasecmp(argv[i], "ignore_root") == 0) {
84 } else if (strcasecmp(argv[i], "ignore_uid") == 0) {
87 pam_afs_syslog(LOG_ERR, PAMAFS_IGNOREUID,
88 "ignore_uid missing argument");
92 ignore_uid_id = (uid_t) strtol(argv[i], (char **)NULL, 10);
93 if ((0 > ignore_uid_id) || (ignore_uid_id > IGNORE_MAX)) {
95 pam_afs_syslog(LOG_ERR, PAMAFS_IGNOREUID, argv[i]);
98 } else if (strcasecmp(argv[i], "cell") == 0) {
101 pam_afs_syslog(LOG_ERR, PAMAFS_OTHERCELL,
102 "cell missing argument");
104 cell_ptr = (char *)argv[i];
105 pam_afs_syslog(LOG_INFO, PAMAFS_OTHERCELL, cell_ptr);
107 } else if (strcasecmp(argv[i], "no_unlog") == 0) {
109 } else if (strcasecmp(argv[i], "refresh_token") == 0) {
111 } else if (strcasecmp(argv[i], "set_token") == 0) {
113 } else if (strcasecmp(argv[i], "dont_fork") == 0) {
115 } else if (strcasecmp(argv[i], "use_klog") == 0) {
117 } else if (strcasecmp(argv[i], "setenv_password_expires") == 0) {
120 pam_afs_syslog(LOG_ERR, PAMAFS_UNKNOWNOPT, argv[i]);
127 if (logmask && LOG_MASK(LOG_DEBUG))
128 pam_afs_syslog(LOG_DEBUG, PAMAFS_OPTIONS, nowarn, use_first_pass,
129 try_first_pass, ignore_uid, ignore_uid_id, 8, 8, 8, 8);
130 /* Try to get the user-interaction info, if available. */
131 errcode = pam_get_item(pamh, PAM_CONV, (PAM_CONST void **)&pam_convp);
132 if (errcode != PAM_SUCCESS) {
133 if (logmask && LOG_MASK(LOG_DEBUG))
134 pam_afs_syslog(LOG_DEBUG, PAMAFS_NO_USER_INT);
138 /* Who are we trying to authenticate here? */
140 pam_get_user(pamh, (PAM_CONST char **)&user,
141 "AFS username:")) != PAM_SUCCESS) {
142 pam_afs_syslog(LOG_ERR, PAMAFS_NOUSER, errcode);
143 RET(PAM_USER_UNKNOWN);
146 * If the user has a "local" (or via nss, possibly nss_dce) pwent,
147 * and its uid==0, and "ignore_root" was given in pam.conf,
150 /* enhanced: use "ignore_uid <number>" to specify the largest uid
151 * which should be ignored by this module
153 #if defined(AFS_HPUX_ENV) || defined(AFS_DARWIN100_ENV) || defined(AFS_SUN58_ENV)
154 #if defined(AFS_HPUX110_ENV) || defined(AFS_DARWIN100_ENV) || defined(AFS_SUN58_ENV)
155 i = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf), &upwd);
156 #else /* AFS_HPUX110_ENV */
157 i = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
158 if (i == 0) /* getpwnam_r success */
160 #endif /* AFS_HPUX110_ENV */
161 if (ignore_uid && i == 0 && upwd && upwd->pw_uid <= ignore_uid_id) {
162 pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
166 #if defined(AFS_LINUX20_ENV) || defined(AFS_FBSD_ENV) || defined(AFS_DFBSD_ENV) || defined(AFS_NBSD_ENV)
167 upwd = getpwnam(user);
169 upwd = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
171 if (ignore_uid && upwd != NULL && upwd->pw_uid <= ignore_uid_id) {
172 pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
177 if (flags & PAM_DELETE_CRED) {
178 if (logmask && LOG_MASK(LOG_DEBUG))
179 pam_afs_syslog(LOG_DEBUG, PAMAFS_DELCRED, user);
182 } else if (flags & PAM_REINITIALIZE_CRED) {
184 if (logmask && LOG_MASK(LOG_DEBUG))
185 pam_afs_syslog(LOG_DEBUG, PAMAFS_REINITCRED, user);
188 } else { /* flags are PAM_REFRESH_CRED, PAM_ESTABLISH_CRED, unknown */
190 if (logmask && LOG_MASK(LOG_DEBUG))
191 pam_afs_syslog(LOG_DEBUG, PAMAFS_ESTABCRED, user);
193 errcode = pam_get_data(pamh, pam_afs_lh, (const void **)&password);
194 if (errcode != PAM_SUCCESS || password == NULL) {
195 if (use_first_pass) {
196 pam_afs_syslog(LOG_ERR, PAMAFS_PASSWD_REQ, user);
199 password = NULL; /* In case it isn't already NULL */
200 if (logmask && LOG_MASK(LOG_DEBUG))
201 pam_afs_syslog(LOG_DEBUG, PAMAFS_NOFIRSTPASS, user);
202 } else if (password[0] == '\0') {
203 /* Actually we *did* get one but it was empty. */
206 /* So don't use it. */
208 if (use_first_pass) {
209 pam_afs_syslog(LOG_ERR, PAMAFS_PASSWD_REQ, user);
210 RET(PAM_NEW_AUTHTOK_REQD);
212 if (logmask && LOG_MASK(LOG_DEBUG))
213 pam_afs_syslog(LOG_DEBUG, PAMAFS_NILPASSWORD, user);
215 if (logmask && LOG_MASK(LOG_DEBUG))
216 pam_afs_syslog(LOG_DEBUG, PAMAFS_GOTPASS, user);
220 if (!(use_first_pass || try_first_pass)) {
225 if (password == NULL) {
230 RET(PAM_AUTH_ERR); /* shouldn't happen */
232 try_first_pass = 0; /* we come back if try_first_pass==1 below */
234 if (pam_convp == NULL || pam_convp->conv == NULL) {
235 pam_afs_syslog(LOG_ERR, PAMAFS_CANNOT_PROMPT);
240 pam_afs_prompt(pam_convp, &password, 0, PAMAFS_PWD_PROMPT);
241 if (errcode != PAM_SUCCESS || password == NULL) {
242 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
245 if (password[0] == '\0') {
246 if (logmask && LOG_MASK(LOG_DEBUG))
247 pam_afs_syslog(LOG_DEBUG, PAMAFS_NILPASSWORD);
248 RET(PAM_NEW_AUTHTOK_REQD);
251 * We aren't going to free the password later (we will wipe it,
252 * though), because the storage for it if we get it from other
253 * paths may belong to someone else. Since we do need to free
254 * this storage, copy it to a buffer that won't need to be freed
255 * later, and free this storage now.
258 strncpy(my_password_buf, password, sizeof(my_password_buf));
259 my_password_buf[sizeof(my_password_buf) - 1] = '\0';
260 memset(password, 0, strlen(password));
262 password = my_password_buf;
265 * We only set a PAG here, if we haven't got one before in
266 * pam_sm_authenticate() or if it was destroyed by the application
268 if ((!refresh_token) && (getPAG() == -1)) {
269 if (logmask && LOG_MASK(LOG_DEBUG))
270 syslog(LOG_DEBUG, "New PAG created in pam_setcred()");
272 #ifdef AFS_KERBEROS_ENV
277 if (flags & PAM_REFRESH_CRED) {
279 auth_ok = !do_klog(user, password, "00:00:01", cell_ptr);
280 ktc_ForgetAllTokens();
282 if (ka_VerifyUserPassword(KA_USERAUTH_VERSION, user, /* kerberos name */
284 cell_ptr, /* realm */
285 password, /* password */
287 &reason /* error string */
289 pam_afs_syslog(LOG_ERR, PAMAFS_LOGIN_FAILED, user,
297 if (flags & PAM_ESTABLISH_CRED) {
299 auth_ok = !do_klog(user, password, NULL, cell_ptr);
301 if (ka_UserAuthenticateGeneral(KA_USERAUTH_VERSION, user, /* kerberos name */
303 cell_ptr, /* realm */
304 password, /* password */
305 0, /* default lifetime */
306 &password_expires, 0, /* spare 2 */
307 &reason /* error string */
309 pam_afs_syslog(LOG_ERR, PAMAFS_LOGIN_FAILED, user,
317 if (!auth_ok && try_first_pass) {
322 /* pam_sm_authenticate should have set this
323 * if (auth_ok && !got_authtok) {
324 * torch_password = 0;
325 * (void) pam_set_item(pamh, PAM_AUTHTOK, password);
330 if (set_expires && !use_klog && (password_expires >= 0)) {
331 strcpy(sbuffer, "PASSWORD_EXPIRES=");
332 strcat(sbuffer, cv2string(&sbuffer[100], password_expires));
333 errcode = pam_putenv(pamh, sbuffer);
334 if (errcode != PAM_SUCCESS)
335 pam_afs_syslog(LOG_ERR, PAMAFS_PASSEXPFAIL, user);
337 #if defined(AFS_KERBEROS_ENV)
339 if (chown(ktc_tkt_string(), upwd->pw_uid, upwd->pw_gid) < 0)
340 pam_afs_syslog(LOG_ERR, PAMAFS_CHOWNKRB, user);
341 sprintf(sbuffer, "KRBTKFILE=%s", ktc_tkt_string());
342 errcode = pam_putenv(pamh, sbuffer);
343 if (errcode != PAM_SUCCESS)
344 pam_afs_syslog(LOG_ERR, PAMAFS_KRBFAIL, user);
355 if (password && torch_password)
356 memset(password, 0, strlen(password));
357 (void)setlogmask(origmask);
358 #ifndef AFS_SUN56_ENV