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8f3a516acb
Any code in source3 is permitted to use talloc_tos() at any point, so we must protect all the library interfaces against memory leaks this way. Andrew Bartlett Signed-off-by: Andrew Bartlett <abartlet@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>
262 lines
6.8 KiB
C
262 lines
6.8 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 3 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, see <http://www.gnu.org/licenses/>.
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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 "lib/util/debug.h"
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#ifndef LINUX
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/* This is only used in the Sun implementation. */
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#if defined(HAVE_SECURITY_PAM_APPL_H)
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#include <security/pam_appl.h>
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#elif defined(HAVE_PAM_PAM_APPL_H)
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#include <pam/pam_appl.h>
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#endif
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#endif /* LINUX */
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#if defined(HAVE_SECURITY_PAM_MODULES_H)
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#include <security/pam_modules.h>
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#elif defined(HAVE_PAM_PAM_MODULES_H)
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#include <pam/pam_modules.h>
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#endif
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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, 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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TALLOC_FREE(frame); \
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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, struct samu *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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struct samu *sampass = NULL;
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const char *name;
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void (*oldsig_handler)(int) = NULL;
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bool found;
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TALLOC_CTX *frame = talloc_stackframe();
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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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load_case_tables_library();
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ctrl = set_ctrl(pamh, 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 = SMB_MALLOC_P(int);
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/* we need to do this before we call AUTH_RETURN */
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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, SIG_IGN);
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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(pamh, 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(pamh, LOG_DEBUG, "username [%s] obtained", name );
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}
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if (geteuid() != 0) {
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_log_err(pamh, LOG_DEBUG, "Cannot access samba password database, not running as root.");
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retval = PAM_AUTHINFO_UNAVAIL;
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AUTH_RETURN;
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}
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if (!initialize_password_db(True, NULL)) {
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_log_err(pamh, 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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sampass = samu_new( NULL );
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if (!sampass) {
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_log_err(pamh, LOG_ALERT, "Cannot talloc a samu struct" );
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retval = nt_status_to_pam(NT_STATUS_NO_MEMORY);
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AUTH_RETURN;
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}
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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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TALLOC_FREE(sampass);
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AUTH_RETURN;
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}
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if (!found) {
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_log_err(pamh, LOG_ALERT, "Failed to find entry for user %s.", name);
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retval = PAM_USER_UNKNOWN;
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TALLOC_FREE(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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TALLOC_FREE(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(pamh,LOG_CRIT, "auth: no password provided for [%s]", name);
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TALLOC_FREE(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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TALLOC_FREE(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", &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, struct samu *sampass, bool exist)
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{
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char *err_str = NULL;
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char *msg_str = NULL;
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const char *pass = NULL;
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int retval;
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TALLOC_CTX *frame = talloc_stackframe();
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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, &pass );
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if (retval != PAM_SUCCESS) {
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_log_err(pamh, LOG_ALERT
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, "pam_get_item returned error to pam_sm_authenticate" );
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TALLOC_FREE(frame);
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return PAM_AUTHTOK_RECOVER_ERR;
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} else if (pass == NULL) {
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TALLOC_FREE(frame);
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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 = NT_STATUS_IS_OK(local_password_change(name, LOCAL_ADD_USER|LOCAL_SET_PASSWORD,
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pass, &err_str, &msg_str));
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if (!retval && err_str) {
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make_remark(pamh, ctrl, PAM_ERROR_MSG, err_str );
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} else if (msg_str) {
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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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SAFE_FREE(err_str);
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SAFE_FREE(msg_str);
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TALLOC_FREE(frame);
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return PAM_IGNORE;
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} else {
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/* mimick 'update encrypted' as long as the 'no pw req' flag is not set */
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if ( pdb_get_acct_ctrl(sampass) & ~ACB_PWNOTREQ ) {
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retval = NT_STATUS_IS_OK(local_password_change(name, LOCAL_SET_PASSWORD,
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pass, &err_str, &msg_str));
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if (!retval && err_str) {
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make_remark(pamh, ctrl, PAM_ERROR_MSG, err_str );
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} else if (msg_str) {
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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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SAFE_FREE(err_str);
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SAFE_FREE(msg_str);
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pass = NULL;
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TALLOC_FREE(frame);
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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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