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
)
45 retval
= local_password_change( user
, 0, pass_new
, err_str
, sizeof(err_str
),
46 msg_str
, sizeof(msg_str
) );
50 err_str
[PSTRING_LEN
-1] = '\0';
51 make_remark( pamh
, ctrl
, PAM_ERROR_MSG
, err_str
);
54 /* FIXME: what value is appropriate here? */
55 retval
= PAM_AUTHTOK_ERR
;
58 msg_str
[PSTRING_LEN
-1] = '\0';
59 make_remark( pamh
, ctrl
, PAM_TEXT_INFO
, msg_str
);
71 #define _SMB_OLD_AUTHTOK "-SMB-OLD-PASS"
72 #define _SMB_NEW_AUTHTOK "-SMB-NEW-PASS"
75 * FUNCTION: pam_sm_chauthtok()
77 * This function is called twice by the PAM library, once with
78 * PAM_PRELIM_CHECK set, and then again with PAM_UPDATE_AUTHTOK set. With
79 * Linux-PAM, these two passes generally involve first checking the old
80 * token and then changing the token. This is what we do here.
82 * Having obtained a new password. The function updates the
83 * SMB_PASSWD_FILE file (normally, $(LIBDIR)/smbpasswd).
86 int pam_sm_chauthtok(pam_handle_t
*pamh
, int flags
,
87 int argc
, const char **argv
)
92 extern BOOL in_client
;
94 SAM_ACCOUNT
*sampass
= NULL
;
101 /* Samba initialization. */
102 setup_logging( "pam_smbpass", False
);
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 if (!NT_STATUS_IS_OK(nt_status
= pdb_init_sam(&sampass
))) {
130 return nt_status_to_pam(nt_status
);
133 if (!pdb_getsampwnam(sampass
,user
)) {
134 _log_err( LOG_ALERT
, "Failed to find entry for user %s.", user
);
135 return PAM_USER_UNKNOWN
;
138 if (flags
& PAM_PRELIM_CHECK
) {
140 * obtain and verify the current password (OLDAUTHTOK) for
146 if (_smb_blankpasswd( ctrl
, sampass
)) {
148 pdb_free_sam(&sampass
);
152 /* Password change by root, or for an expired token, doesn't
153 require authentication. Is this a good choice? */
154 if (getuid() != 0 && !(flags
& PAM_CHANGE_EXPIRED_AUTHTOK
)) {
156 /* tell user what is happening */
157 #define greeting "Changing password for "
158 Announce
= (char *) malloc(sizeof(greeting
)+strlen(user
));
159 if (Announce
== NULL
) {
160 _log_err(LOG_CRIT
, "password: out of memory");
161 pdb_free_sam(&sampass
);
164 strncpy( Announce
, greeting
, sizeof(greeting
) );
165 strncpy( Announce
+sizeof(greeting
)-1, user
, strlen(user
)+1 );
168 set( SMB__OLD_PASSWD
, ctrl
);
169 retval
= _smb_read_password( pamh
, ctrl
, Announce
, "Current SMB password: ",
170 NULL
, _SMB_OLD_AUTHTOK
, &pass_old
);
171 SAFE_FREE( Announce
);
173 if (retval
!= PAM_SUCCESS
) {
175 , "password - (old) token not obtained" );
176 pdb_free_sam(&sampass
);
180 /* verify that this is the password for this user */
182 retval
= _smb_verify_password( pamh
, sampass
, pass_old
, ctrl
);
186 retval
= PAM_SUCCESS
; /* root doesn't have to */
190 pdb_free_sam(&sampass
);
193 } else if (flags
& PAM_UPDATE_AUTHTOK
) {
196 /* We used to return when this flag was set, but that breaks
197 password synchronization when /other/ tokens are expired. For
198 now, we change the password whenever we're asked. SRL */
199 if (flags
& PAM_CHANGE_EXPIRED_AUTHTOK
) {
200 pdb_free_sam(&sampass
);
205 * obtain the proposed password
209 * get the old token back. NULL was ok only if root [at this
210 * point we assume that this has already been enforced on a
211 * previous call to this function].
214 if (off( SMB_NOT_SET_PASS
, ctrl
)) {
215 retval
= pam_get_item( pamh
, PAM_OLDAUTHTOK
,
216 (const void **)&pass_old
);
218 retval
= pam_get_data( pamh
, _SMB_OLD_AUTHTOK
,
219 (const void **)&pass_old
);
220 if (retval
== PAM_NO_MODULE_DATA
) {
222 retval
= PAM_SUCCESS
;
226 if (retval
!= PAM_SUCCESS
) {
227 _log_err( LOG_NOTICE
, "password: user not authenticated" );
228 pdb_free_sam(&sampass
);
233 * use_authtok is to force the use of a previously entered
234 * password -- needed for pluggable password strength checking
235 * or other module stacking
238 if (on( SMB_USE_AUTHTOK
, ctrl
)) {
239 set( SMB_USE_FIRST_PASS
, ctrl
);
242 retval
= _smb_read_password( pamh
, ctrl
244 , "Enter new SMB password: "
245 , "Retype new SMB password: "
249 if (retval
!= PAM_SUCCESS
) {
250 if (on( SMB_DEBUG
, ctrl
)) {
252 , "password: new password not obtained" );
254 pass_old
= NULL
; /* tidy up */
255 pdb_free_sam(&sampass
);
260 * At this point we know who the user is and what they
261 * propose as their new password. Verify that the new
262 * password is acceptable.
265 if (pass_new
[0] == '\0') { /* "\0" password = NULL */
269 retval
= _pam_smb_approve_pass(pamh
, ctrl
, pass_old
, pass_new
);
271 if (retval
!= PAM_SUCCESS
) {
272 _log_err(LOG_NOTICE
, "new password not acceptable");
273 pass_new
= pass_old
= NULL
; /* tidy up */
274 pdb_free_sam(&sampass
);
279 * By reaching here we have approved the passwords and must now
280 * rebuild the smb password file.
283 /* update the password database */
285 retval
= smb_update_db(pamh
, ctrl
, user
, pass_new
);
286 if (retval
== PAM_SUCCESS
) {
287 /* password updated */
288 _log_err( LOG_NOTICE
, "password for (%s/%d) changed by (%s/%d)"
289 , user
, pdb_get_uid(sampass
), uidtoname( getuid() )
292 _log_err( LOG_ERR
, "password change failed for user %s"
296 pass_old
= pass_new
= NULL
;
298 pdb_free_sam(&sampass
);
302 } else { /* something has broken with the library */
304 _log_err( LOG_ALERT
, "password received unknown request" );
310 pdb_free_sam(&sampass
);
314 pdb_free_sam(&sampass
);
318 /* static module data */
320 struct pam_module _pam_smbpass_passwd_modstruct
= {