+++ /dev/null
-/*
- Unix SMB/CIFS implementation.
- Use PAM to update user passwords in the local SAM
- Copyright (C) Steve Langasek 1998-2003
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-*/
-
-/* indicate the following groups are defined */
-#define PAM_SM_PASSWORD
-
-#include "includes.h"
-
-/* This is only used in the Sun implementation. FIXME: we really
- want a define here that distinguishes between the Solaris PAM
- and others (including FreeBSD). */
-
-#ifndef LINUX
-#if defined(HAVE_SECURITY_PAM_APPL_H)
-#include <security/pam_appl.h>
-#elif defined(HAVE_PAM_PAM_APPL_H)
-#include <pam/pam_appl.h>
-#endif
-#endif
-
-#if defined(HAVE_SECURITY_PAM_MODULES_H)
-#include <security/pam_modules.h>
-#elif defined(HAVE_PAM_PAM_MODULES_H)
-#include <pam/pam_modules.h>
-#endif
-
-#include "general.h"
-
-#include "support.h"
-
-int smb_update_db( pam_handle_t *pamh, int ctrl, const char *user, const char *pass_new )
-{
- int retval;
- char *err_str = NULL;
- char *msg_str = NULL;
-
- retval = NT_STATUS_IS_OK(local_password_change(user, LOCAL_SET_PASSWORD, pass_new,
- &err_str,
- &msg_str));
-
- if (!retval) {
- if (err_str) {
- make_remark(pamh, ctrl, PAM_ERROR_MSG, err_str );
- }
-
- /* FIXME: what value is appropriate here? */
- retval = PAM_AUTHTOK_ERR;
- } else {
- if (msg_str) {
- make_remark(pamh, ctrl, PAM_TEXT_INFO, msg_str );
- }
- retval = PAM_SUCCESS;
- }
-
- SAFE_FREE(err_str);
- SAFE_FREE(msg_str);
- return retval;
-}
-
-
-/* data tokens */
-
-#define _SMB_OLD_AUTHTOK "-SMB-OLD-PASS"
-#define _SMB_NEW_AUTHTOK "-SMB-NEW-PASS"
-
-/*
- * FUNCTION: pam_sm_chauthtok()
- *
- * This function is called twice by the PAM library, once with
- * PAM_PRELIM_CHECK set, and then again with PAM_UPDATE_AUTHTOK set. With
- * Linux-PAM, these two passes generally involve first checking the old
- * token and then changing the token. This is what we do here.
- *
- * Having obtained a new password. The function updates the
- * SMB_PASSWD_FILE file (normally, $(LIBDIR)/smbpasswd).
- */
-
-int pam_sm_chauthtok(pam_handle_t *pamh, int flags,
- int argc, const char **argv)
-{
- unsigned int ctrl;
- int retval;
-
- extern bool in_client;
-
- struct samu *sampass = NULL;
- void (*oldsig_handler)(int);
- const char *user;
- char *pass_old;
- char *pass_new;
-
- /* Samba initialization. */
- load_case_tables();
- setup_logging( "pam_smbpass", False );
- in_client = True;
-
- ctrl = set_ctrl(flags, argc, argv);
-
- /*
- * First get the name of a user. No need to do anything if we can't
- * determine this.
- */
-
- retval = pam_get_user( pamh, &user, "Username: " );
- if (retval != PAM_SUCCESS) {
- if (on( SMB_DEBUG, ctrl )) {
- _log_err( LOG_DEBUG, "password: could not identify user" );
- }
- return retval;
- }
- if (on( SMB_DEBUG, ctrl )) {
- _log_err( LOG_DEBUG, "username [%s] obtained", user );
- }
-
- if (geteuid() != 0) {
- _log_err( LOG_DEBUG, "Cannot access samba password database, not running as root.");
- return PAM_AUTHINFO_UNAVAIL;
- }
-
- /* Getting into places that might use LDAP -- protect the app
- from a SIGPIPE it's not expecting */
- oldsig_handler = CatchSignal(SIGPIPE, SIGNAL_CAST SIG_IGN);
-
- if (!initialize_password_db(False, NULL)) {
- _log_err( LOG_ALERT, "Cannot access samba password database" );
- CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
- return PAM_AUTHINFO_UNAVAIL;
- }
-
- /* obtain user record */
- if ( !(sampass = samu_new( NULL )) ) {
- CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
- return nt_status_to_pam(NT_STATUS_NO_MEMORY);
- }
-
- if (!pdb_getsampwnam(sampass,user)) {
- _log_err( LOG_ALERT, "Failed to find entry for user %s.", user );
- CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
- return PAM_USER_UNKNOWN;
- }
- if (on( SMB_DEBUG, ctrl )) {
- _log_err( LOG_DEBUG, "Located account for %s", user );
- }
-
- if (flags & PAM_PRELIM_CHECK) {
- /*
- * obtain and verify the current password (OLDAUTHTOK) for
- * the user.
- */
-
- char *Announce;
-
- if (_smb_blankpasswd( ctrl, sampass )) {
-
- TALLOC_FREE(sampass);
- CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
- return PAM_SUCCESS;
- }
-
- /* Password change by root, or for an expired token, doesn't
- require authentication. Is this a good choice? */
- if (getuid() != 0 && !(flags & PAM_CHANGE_EXPIRED_AUTHTOK)) {
-
- /* tell user what is happening */
-#define greeting "Changing password for "
- Announce = SMB_MALLOC_ARRAY(char, sizeof(greeting)+strlen(user));
- if (Announce == NULL) {
- _log_err(LOG_CRIT, "password: out of memory");
- TALLOC_FREE(sampass);
- CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
- return PAM_BUF_ERR;
- }
- strncpy( Announce, greeting, sizeof(greeting) );
- strncpy( Announce+sizeof(greeting)-1, user, strlen(user)+1 );
-#undef greeting
-
- set( SMB__OLD_PASSWD, ctrl );
- retval = _smb_read_password( pamh, ctrl, Announce, "Current SMB password: ",
- NULL, _SMB_OLD_AUTHTOK, &pass_old );
- SAFE_FREE( Announce );
-
- if (retval != PAM_SUCCESS) {
- _log_err( LOG_NOTICE
- , "password - (old) token not obtained" );
- TALLOC_FREE(sampass);
- CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
- return retval;
- }
-
- /* verify that this is the password for this user */
-
- retval = _smb_verify_password( pamh, sampass, pass_old, ctrl );
-
- } else {
- pass_old = NULL;
- retval = PAM_SUCCESS; /* root doesn't have to */
- }
-
- pass_old = NULL;
- TALLOC_FREE(sampass);
- CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
- return retval;
-
- } else if (flags & PAM_UPDATE_AUTHTOK) {
-
- /*
- * obtain the proposed password
- */
-
- /*
- * get the old token back. NULL was ok only if root [at this
- * point we assume that this has already been enforced on a
- * previous call to this function].
- */
-
- if (off( SMB_NOT_SET_PASS, ctrl )) {
- retval = pam_get_item( pamh, PAM_OLDAUTHTOK,
- (const void **)&pass_old );
- } else {
- retval = pam_get_data( pamh, _SMB_OLD_AUTHTOK,
- (const void **)&pass_old );
- if (retval == PAM_NO_MODULE_DATA) {
- pass_old = NULL;
- retval = PAM_SUCCESS;
- }
- }
-
- if (retval != PAM_SUCCESS) {
- _log_err( LOG_NOTICE, "password: user not authenticated" );
- TALLOC_FREE(sampass);
- CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
- return retval;
- }
-
- /*
- * use_authtok is to force the use of a previously entered
- * password -- needed for pluggable password strength checking
- * or other module stacking
- */
-
- if (on( SMB_USE_AUTHTOK, ctrl )) {
- set( SMB_USE_FIRST_PASS, ctrl );
- }
-
- retval = _smb_read_password( pamh, ctrl
- , NULL
- , "Enter new SMB password: "
- , "Retype new SMB password: "
- , _SMB_NEW_AUTHTOK
- , &pass_new );
-
- if (retval != PAM_SUCCESS) {
- if (on( SMB_DEBUG, ctrl )) {
- _log_err( LOG_ALERT
- , "password: new password not obtained" );
- }
- pass_old = NULL; /* tidy up */
- TALLOC_FREE(sampass);
- CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
- return retval;
- }
-
- /*
- * At this point we know who the user is and what they
- * propose as their new password. Verify that the new
- * password is acceptable.
- */
-
- if (pass_new[0] == '\0') { /* "\0" password = NULL */
- pass_new = NULL;
- }
-
- retval = _pam_smb_approve_pass(pamh, ctrl, pass_old, pass_new);
-
- if (retval != PAM_SUCCESS) {
- _log_err(LOG_NOTICE, "new password not acceptable");
- pass_new = pass_old = NULL; /* tidy up */
- TALLOC_FREE(sampass);
- CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
- return retval;
- }
-
- /*
- * By reaching here we have approved the passwords and must now
- * rebuild the smb password file.
- */
-
- /* update the password database */
-
- retval = smb_update_db(pamh, ctrl, user, pass_new);
- if (retval == PAM_SUCCESS) {
- uid_t uid;
-
- /* password updated */
- if (!sid_to_uid(pdb_get_user_sid(sampass), &uid)) {
- _log_err( LOG_NOTICE, "Unable to get uid for user %s",
- pdb_get_username(sampass));
- _log_err( LOG_NOTICE, "password for (%s) changed by (%s/%d)",
- user, uidtoname(getuid()), getuid());
- } else {
- _log_err( LOG_NOTICE, "password for (%s/%d) changed by (%s/%d)",
- user, uid, uidtoname(getuid()), getuid());
- }
- } else {
- _log_err( LOG_ERR, "password change failed for user %s", user);
- }
-
- pass_old = pass_new = NULL;
- if (sampass) {
- TALLOC_FREE(sampass);
- sampass = NULL;
- }
-
- } else { /* something has broken with the library */
-
- _log_err( LOG_ALERT, "password received unknown request" );
- retval = PAM_ABORT;
-
- }
-
- if (sampass) {
- TALLOC_FREE(sampass);
- sampass = NULL;
- }
-
- TALLOC_FREE(sampass);
- CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
- return retval;
-}
-
-/* static module data */
-#ifdef PAM_STATIC
-struct pam_module _pam_smbpass_passwd_modstruct = {
- "pam_smbpass",
- NULL,
- NULL,
- NULL,
- NULL,
- NULL,
- pam_sm_chauthtok
-};
-#endif
-
git.samba.org / samba.git / blobdiff