1 /* Unix NT password database implementation, version 0.7.5.
3 * This program is free software; you can redistribute it and/or modify it under
4 * the terms of the GNU General Public License as published by the Free
5 * Software Foundation; either version 2 of the License, or (at your option)
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 675
15 * Mass Ave, Cambridge, MA 02139, USA.
18 /* indicate the following groups are defined */
19 #define PAM_SM_PASSWORD
25 /* This is only used in the Sun implementation. */
26 #include <security/pam_appl.h>
30 #include <security/pam_modules.h>
36 int smb_update_db( pam_handle_t *pamh, int ctrl, const char *user, const char *pass_new )
46 retval = local_password_change( user, 0, pass_new, err_str, sizeof(err_str),
47 msg_str, sizeof(msg_str) );
51 err_str[PSTRING_LEN-1] = '\0';
52 make_remark( pamh, ctrl, PAM_ERROR_MSG, err_str );
55 /* FIXME: what value is appropriate here? */
56 retval = PAM_AUTHTOK_ERR;
59 msg_str[PSTRING_LEN-1] = '\0';
60 make_remark( pamh, ctrl, PAM_TEXT_INFO, msg_str );
72 #define _SMB_OLD_AUTHTOK "-SMB-OLD-PASS"
73 #define _SMB_NEW_AUTHTOK "-SMB-NEW-PASS"
76 * FUNCTION: pam_sm_chauthtok()
78 * This function is called twice by the PAM library, once with
79 * PAM_PRELIM_CHECK set, and then again with PAM_UPDATE_AUTHTOK set. With
80 * Linux-PAM, these two passes generally involve first checking the old
81 * token and then changing the token. This is what we do here.
83 * Having obtained a new password. The function updates the
84 * SMB_PASSWD_FILE file (normally, $(LIBDIR)/smbpasswd).
87 int pam_sm_chauthtok(pam_handle_t *pamh, int flags,
88 int argc, const char **argv)
93 extern BOOL in_client;
95 SAM_ACCOUNT *sampass = NULL;
97 const char *pass_old, *pass_new;
99 /* Samba initialization. */
100 setup_logging( "pam_smbpass", False );
101 charset_initialise();
102 codepage_initialise(lp_client_code_page());
105 ctrl = set_ctrl(flags, argc, argv);
108 * First get the name of a user. No need to do anything if we can't
112 retval = pam_get_user( pamh, &user, "Username: " );
113 if (retval != PAM_SUCCESS) {
114 if (on( SMB_DEBUG, ctrl )) {
115 _log_err( LOG_DEBUG, "password: could not identify user" );
119 if (on( SMB_DEBUG, ctrl )) {
120 _log_err( LOG_DEBUG, "username [%s] obtained", user );
123 if (!initialize_password_db(True)) {
124 _log_err( LOG_ALERT, "Cannot access samba password database" );
125 return PAM_AUTHINFO_UNAVAIL;
128 /* obtain user record */
129 pdb_init_sam(&sampass);
130 pdb_getsampwnam(sampass,user);
132 if (sampass == NULL) {
133 _log_err( LOG_ALERT, "Failed to find entry for user %s.", user );
134 return PAM_USER_UNKNOWN;
137 if (flags & PAM_PRELIM_CHECK) {
139 * obtain and verify the current password (OLDAUTHTOK) for
145 if (_smb_blankpasswd( ctrl, sampass )) {
147 pdb_free_sam(&sampass);
151 /* Password change by root, or for an expired token, doesn't
152 require authentication. Is this a good choice? */
153 if (getuid() != 0 && !(flags & PAM_CHANGE_EXPIRED_AUTHTOK)) {
155 /* tell user what is happening */
156 #define greeting "Changing password for "
157 Announce = (char *) malloc(sizeof(greeting)+strlen(user));
158 if (Announce == NULL) {
159 _log_err(LOG_CRIT, "password: out of memory");
160 pdb_free_sam(&sampass);
163 strncpy( Announce, greeting, sizeof(greeting) );
164 strncpy( Announce+sizeof(greeting)-1, user, strlen(user)+1 );
167 set( SMB__OLD_PASSWD, ctrl );
168 retval = _smb_read_password( pamh, ctrl, Announce, "Current SMB password: ",
169 NULL, _SMB_OLD_AUTHTOK, &pass_old );
170 SAFE_FREE( Announce );
172 if (retval != PAM_SUCCESS) {
174 , "password - (old) token not obtained" );
175 pdb_free_sam(&sampass);
179 /* verify that this is the password for this user */
181 retval = _smb_verify_password( pamh, sampass, pass_old, ctrl );
185 retval = PAM_SUCCESS; /* root doesn't have to */
189 pdb_free_sam(&sampass);
192 } else if (flags & PAM_UPDATE_AUTHTOK) {
195 /* We used to return when this flag was set, but that breaks
196 password synchronization when /other/ tokens are expired. For
197 now, we change the password whenever we're asked. SRL */
198 if (flags & PAM_CHANGE_EXPIRED_AUTHTOK) {
199 pdb_free_sam(&sampass);
204 * obtain the proposed password
208 * get the old token back. NULL was ok only if root [at this
209 * point we assume that this has already been enforced on a
210 * previous call to this function].
213 if (off( SMB_NOT_SET_PASS, ctrl )) {
214 retval = pam_get_item( pamh, PAM_OLDAUTHTOK,
215 (const void **)&pass_old );
217 retval = pam_get_data( pamh, _SMB_OLD_AUTHTOK,
218 (const void **)&pass_old );
219 if (retval == PAM_NO_MODULE_DATA) {
221 retval = PAM_SUCCESS;
225 if (retval != PAM_SUCCESS) {
226 _log_err( LOG_NOTICE, "password: user not authenticated" );
227 pdb_free_sam(&sampass);
232 * use_authtok is to force the use of a previously entered
233 * password -- needed for pluggable password strength checking
234 * or other module stacking
237 if (on( SMB_USE_AUTHTOK, ctrl )) {
238 set( SMB_USE_FIRST_PASS, ctrl );
241 retval = _smb_read_password( pamh, ctrl
243 , "Enter new SMB password: "
244 , "Retype new SMB password: "
248 if (retval != PAM_SUCCESS) {
249 if (on( SMB_DEBUG, ctrl )) {
251 , "password: new password not obtained" );
253 pass_old = NULL; /* tidy up */
254 pdb_free_sam(&sampass);
259 * At this point we know who the user is and what they
260 * propose as their new password. Verify that the new
261 * password is acceptable.
264 if (pass_new[0] == '\0') { /* "\0" password = NULL */
268 retval = _pam_smb_approve_pass(pamh, ctrl, pass_old, pass_new);
270 if (retval != PAM_SUCCESS) {
271 _log_err(LOG_NOTICE, "new password not acceptable");
272 pass_new = pass_old = NULL; /* tidy up */
273 pdb_free_sam(&sampass);
278 * By reaching here we have approved the passwords and must now
279 * rebuild the smb password file.
282 /* update the password database */
284 retval = smb_update_db(pamh, ctrl, user, pass_new);
285 if (retval == PAM_SUCCESS) {
286 /* password updated */
287 _log_err( LOG_NOTICE, "password for (%s/%d) changed by (%s/%d)"
288 , user, pdb_get_uid(sampass), uidtoname( getuid() )
291 _log_err( LOG_ERR, "password change failed for user %s"
295 pass_old = pass_new = NULL;
297 pdb_free_sam(&sampass);
301 } else { /* something has broken with the library */
303 _log_err( LOG_ALERT, "password received unknown request" );
309 pdb_free_sam(&sampass);
313 pdb_free_sam(&sampass);
317 /* static module data */
319 struct pam_module _pam_smbpass_passwd_modstruct = {