mirror of
https://github.com/samba-team/samba.git
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5d40499b9f
(This used to be commit f21182e24f
)
257 lines
6.7 KiB
C
257 lines
6.7 KiB
C
/* Unix NT password database implementation, version 0.7.5.
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 675
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* Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* indicate the following groups are defined */
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#define PAM_SM_AUTH
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#include "includes.h"
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#include "debug.h"
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#ifndef LINUX
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/* This is only used in the Sun implementation. */
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#include <security/pam_appl.h>
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#endif /* LINUX */
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#include <security/pam_modules.h>
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#include "general.h"
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#include "support.h"
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#define AUTH_RETURN \
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do { \
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/* Restore application signal handler */ \
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CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler); \
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if(ret_data) { \
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*ret_data = retval; \
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pam_set_data( pamh, "smb_setcred_return" \
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, (void *) ret_data, NULL ); \
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} \
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return retval; \
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} while (0)
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static int _smb_add_user(pam_handle_t *pamh, unsigned int ctrl,
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const char *name, SAM_ACCOUNT *sampass, BOOL exist);
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/*
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* pam_sm_authenticate() authenticates users against the samba password file.
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*
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* First, obtain the password from the user. Then use a
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* routine in 'support.c' to authenticate the user.
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*/
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#define _SMB_AUTHTOK "-SMB-PASS"
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int pam_sm_authenticate(pam_handle_t *pamh, int flags,
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int argc, const char **argv)
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{
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unsigned int ctrl;
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int retval, *ret_data = NULL;
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SAM_ACCOUNT *sampass = NULL;
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extern BOOL in_client;
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const char *name;
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void (*oldsig_handler)(int);
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BOOL found;
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/* Points to memory managed by the PAM library. Do not free. */
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char *p = NULL;
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/* Samba initialization. */
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setup_logging("pam_smbpass",False);
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in_client = True;
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ctrl = set_ctrl(flags, argc, argv);
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/* Get a few bytes so we can pass our return value to
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pam_sm_setcred(). */
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ret_data = malloc(sizeof(int));
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/* get the username */
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retval = pam_get_user( pamh, &name, "Username: " );
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if ( retval != PAM_SUCCESS ) {
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if (on( SMB_DEBUG, ctrl )) {
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_log_err(LOG_DEBUG, "auth: could not identify user");
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}
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AUTH_RETURN;
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}
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if (on( SMB_DEBUG, ctrl )) {
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_log_err( LOG_DEBUG, "username [%s] obtained", name );
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}
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/* Getting into places that might use LDAP -- protect the app
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from a SIGPIPE it's not expecting */
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oldsig_handler = CatchSignal(SIGPIPE, SIGNAL_CAST SIG_IGN);
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if (!initialize_password_db(True)) {
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_log_err( LOG_ALERT, "Cannot access samba password database" );
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retval = PAM_AUTHINFO_UNAVAIL;
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AUTH_RETURN;
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}
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pdb_init_sam(&sampass);
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found = pdb_getsampwnam( sampass, name );
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if (on( SMB_MIGRATE, ctrl )) {
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retval = _smb_add_user(pamh, ctrl, name, sampass, found);
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pdb_free_sam(&sampass);
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AUTH_RETURN;
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}
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if (!found) {
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_log_err(LOG_ALERT, "Failed to find entry for user %s.", name);
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retval = PAM_USER_UNKNOWN;
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pdb_free_sam(&sampass);
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sampass = NULL;
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AUTH_RETURN;
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}
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/* if this user does not have a password... */
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if (_smb_blankpasswd( ctrl, sampass )) {
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pdb_free_sam(&sampass);
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retval = PAM_SUCCESS;
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AUTH_RETURN;
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}
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/* get this user's authentication token */
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retval = _smb_read_password(pamh, ctrl, NULL, "Password: ", NULL, _SMB_AUTHTOK, &p);
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if (retval != PAM_SUCCESS ) {
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_log_err(LOG_CRIT, "auth: no password provided for [%s]"
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, name);
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pdb_free_sam(&sampass);
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AUTH_RETURN;
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}
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/* verify the password of this user */
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retval = _smb_verify_password( pamh, sampass, p, ctrl );
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pdb_free_sam(&sampass);
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p = NULL;
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AUTH_RETURN;
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}
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/*
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* This function is for setting samba credentials. If anyone comes up
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* with any credentials they think should be set, let me know.
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*/
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int pam_sm_setcred(pam_handle_t *pamh, int flags,
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int argc, const char **argv)
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{
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int retval, *pretval = NULL;
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retval = PAM_SUCCESS;
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pam_get_data(pamh, "smb_setcred_return", (const void **) &pretval);
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if(pretval) {
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retval = *pretval;
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SAFE_FREE(pretval);
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}
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pam_set_data(pamh, "smb_setcred_return", NULL, NULL);
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return retval;
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}
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/* Helper function for adding a user to the db. */
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static int _smb_add_user(pam_handle_t *pamh, unsigned int ctrl,
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const char *name, SAM_ACCOUNT *sampass, BOOL exist)
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{
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pstring err_str;
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pstring msg_str;
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const char *pass = NULL;
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int retval;
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err_str[0] = '\0';
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msg_str[0] = '\0';
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/* Get the authtok; if we don't have one, silently fail. */
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retval = pam_get_item( pamh, PAM_AUTHTOK, (const void **) &pass );
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if (retval != PAM_SUCCESS) {
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_log_err( LOG_ALERT
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, "pam_get_item returned error to pam_sm_authenticate" );
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return PAM_AUTHTOK_RECOVER_ERR;
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} else if (pass == NULL) {
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return PAM_AUTHTOK_RECOVER_ERR;
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}
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/* Add the user to the db if they aren't already there. */
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if (!exist) {
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retval = local_password_change( name, LOCAL_ADD_USER|LOCAL_SET_PASSWORD,
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pass, err_str,
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sizeof(err_str),
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msg_str, sizeof(msg_str) );
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if (!retval && *err_str)
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{
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err_str[PSTRING_LEN-1] = '\0';
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make_remark( pamh, ctrl, PAM_ERROR_MSG, err_str );
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}
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else if (*msg_str)
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{
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msg_str[PSTRING_LEN-1] = '\0';
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make_remark( pamh, ctrl, PAM_TEXT_INFO, msg_str );
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}
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pass = NULL;
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return PAM_IGNORE;
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}
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else {
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/* Change the user's password IFF it's null. */
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if ((pdb_get_lanman_passwd(sampass) == NULL) && (pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ))
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{
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retval = local_password_change( name, 0, pass, err_str, sizeof(err_str),
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msg_str, sizeof(msg_str) );
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if (!retval && *err_str)
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{
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err_str[PSTRING_LEN-1] = '\0';
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make_remark( pamh, ctrl, PAM_ERROR_MSG, err_str );
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}
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else if (*msg_str)
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{
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msg_str[PSTRING_LEN-1] = '\0';
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make_remark( pamh, ctrl, PAM_TEXT_INFO, msg_str );
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}
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}
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}
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pass = NULL;
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return PAM_IGNORE;
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}
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/* static module data */
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#ifdef PAM_STATIC
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struct pam_module _pam_smbpass_auth_modstruct = {
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"pam_smbpass",
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pam_sm_authenticate,
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pam_sm_setcred,
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NULL,
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NULL,
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NULL,
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NULL
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};
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#endif
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