--- /dev/null
+/* Unix NT password database implementation, version 0.7.5.
+ *
+ * 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 2 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, write to the Free Software Foundation, Inc., 675
+ * Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/* indicate the following groups are defined */
+#define PAM_SM_AUTH
+
+#include "includes.h"
+#include "debug.h"
+
+#ifndef LINUX
+
+/* This is only used in the Sun implementation. */
+#include <security/pam_appl.h>
+
+#endif /* LINUX */
+
+#include <security/pam_modules.h>
+
+#include "general.h"
+
+#include "support.h"
+
+#define AUTH_RETURN \
+do { \
+ /* Restore application signal handler */ \
+ CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler); \
+ if(ret_data) { \
+ *ret_data = retval; \
+ pam_set_data( pamh, "smb_setcred_return" \
+ , (void *) ret_data, NULL ); \
+ } \
+ return retval; \
+} while (0)
+
+static int _smb_add_user(pam_handle_t *pamh, unsigned int ctrl,
+ const char *name, SAM_ACCOUNT *sampass, BOOL exist);
+
+
+/*
+ * pam_sm_authenticate() authenticates users against the samba password file.
+ *
+ * First, obtain the password from the user. Then use a
+ * routine in 'support.c' to authenticate the user.
+ */
+
+#define _SMB_AUTHTOK "-SMB-PASS"
+
+int pam_sm_authenticate(pam_handle_t *pamh, int flags,
+ int argc, const char **argv)
+{
+ unsigned int ctrl;
+ int retval, *ret_data = NULL;
+ SAM_ACCOUNT *sampass = NULL;
+ extern BOOL in_client;
+ const char *name;
+ void (*oldsig_handler)(int) = NULL;
+ BOOL found;
+
+ /* Points to memory managed by the PAM library. Do not free. */
+ char *p = NULL;
+
+
+ /* Samba initialization. */
+ setup_logging("pam_smbpass",False);
+ in_client = True;
+
+ ctrl = set_ctrl(flags, argc, argv);
+
+ /* Get a few bytes so we can pass our return value to
+ pam_sm_setcred(). */
+ ret_data = SMB_MALLOC_P(int);
+
+ /* we need to do this before we call AUTH_RETURN */
+ /* 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);
+
+ /* get the username */
+ retval = pam_get_user( pamh, &name, "Username: " );
+ if ( retval != PAM_SUCCESS ) {
+ if (on( SMB_DEBUG, ctrl )) {
+ _log_err(LOG_DEBUG, "auth: could not identify user");
+ }
+ AUTH_RETURN;
+ }
+ if (on( SMB_DEBUG, ctrl )) {
+ _log_err( LOG_DEBUG, "username [%s] obtained", name );
+ }
+
+ if (!initialize_password_db(True)) {
+ _log_err( LOG_ALERT, "Cannot access samba password database" );
+ retval = PAM_AUTHINFO_UNAVAIL;
+ AUTH_RETURN;
+ }
+
+ pdb_init_sam(&sampass);
+
+ found = pdb_getsampwnam( sampass, name );
+
+ if (on( SMB_MIGRATE, ctrl )) {
+ retval = _smb_add_user(pamh, ctrl, name, sampass, found);
+ pdb_free_sam(&sampass);
+ AUTH_RETURN;
+ }
+
+ if (!found) {
+ _log_err(LOG_ALERT, "Failed to find entry for user %s.", name);
+ retval = PAM_USER_UNKNOWN;
+ pdb_free_sam(&sampass);
+ sampass = NULL;
+ AUTH_RETURN;
+ }
+
+ /* if this user does not have a password... */
+
+ if (_smb_blankpasswd( ctrl, sampass )) {
+ pdb_free_sam(&sampass);
+ retval = PAM_SUCCESS;
+ AUTH_RETURN;
+ }
+
+ /* get this user's authentication token */
+
+ retval = _smb_read_password(pamh, ctrl, NULL, "Password: ", NULL, _SMB_AUTHTOK, &p);
+ if (retval != PAM_SUCCESS ) {
+ _log_err(LOG_CRIT, "auth: no password provided for [%s]"
+ , name);
+ pdb_free_sam(&sampass);
+ AUTH_RETURN;
+ }
+
+ /* verify the password of this user */
+
+ retval = _smb_verify_password( pamh, sampass, p, ctrl );
+ pdb_free_sam(&sampass);
+ p = NULL;
+ AUTH_RETURN;
+}
+
+/*
+ * This function is for setting samba credentials. If anyone comes up
+ * with any credentials they think should be set, let me know.
+ */
+
+int pam_sm_setcred(pam_handle_t *pamh, int flags,
+ int argc, const char **argv)
+{
+ int retval, *pretval = NULL;
+
+ retval = PAM_SUCCESS;
+
+ pam_get_data(pamh, "smb_setcred_return", (const void **) &pretval);
+ if(pretval) {
+ retval = *pretval;
+ SAFE_FREE(pretval);
+ }
+ pam_set_data(pamh, "smb_setcred_return", NULL, NULL);
+
+ return retval;
+}
+
+
+/* Helper function for adding a user to the db. */
+static int _smb_add_user(pam_handle_t *pamh, unsigned int ctrl,
+ const char *name, SAM_ACCOUNT *sampass, BOOL exist)
+{
+ pstring err_str;
+ pstring msg_str;
+ const char *pass = NULL;
+ int retval;
+
+ err_str[0] = '\0';
+ msg_str[0] = '\0';
+
+ /* Get the authtok; if we don't have one, silently fail. */
+ retval = pam_get_item( pamh, PAM_AUTHTOK, (const void **) &pass );
+
+ if (retval != PAM_SUCCESS) {
+ _log_err( LOG_ALERT
+ , "pam_get_item returned error to pam_sm_authenticate" );
+ return PAM_AUTHTOK_RECOVER_ERR;
+ } else if (pass == NULL) {
+ return PAM_AUTHTOK_RECOVER_ERR;
+ }
+
+ /* Add the user to the db if they aren't already there. */
+ if (!exist) {
+ retval = local_password_change( name, LOCAL_ADD_USER|LOCAL_SET_PASSWORD,
+ pass, err_str,
+ sizeof(err_str),
+ msg_str, sizeof(msg_str) );
+ if (!retval && *err_str)
+ {
+ err_str[PSTRING_LEN-1] = '\0';
+ make_remark( pamh, ctrl, PAM_ERROR_MSG, err_str );
+ }
+ else if (*msg_str)
+ {
+ msg_str[PSTRING_LEN-1] = '\0';
+ make_remark( pamh, ctrl, PAM_TEXT_INFO, msg_str );
+ }
+ pass = NULL;
+
+ return PAM_IGNORE;
+ }
+ else {
+ /* mimick 'update encrypted' as long as the 'no pw req' flag is not set */
+ if ( pdb_get_acct_ctrl(sampass) & ~ACB_PWNOTREQ )
+ {
+ retval = local_password_change( name, LOCAL_SET_PASSWORD, pass, err_str, sizeof(err_str),
+ msg_str, sizeof(msg_str) );
+ if (!retval && *err_str)
+ {
+ err_str[PSTRING_LEN-1] = '\0';
+ make_remark( pamh, ctrl, PAM_ERROR_MSG, err_str );
+ }
+ else if (*msg_str)
+ {
+ msg_str[PSTRING_LEN-1] = '\0';
+ make_remark( pamh, ctrl, PAM_TEXT_INFO, msg_str );
+ }
+ }
+ }
+
+ pass = NULL;
+
+ return PAM_IGNORE;
+}
+
+
+/* static module data */
+#ifdef PAM_STATIC
+struct pam_module _pam_smbpass_auth_modstruct = {
+ "pam_smbpass",
+ pam_sm_authenticate,
+ pam_sm_setcred,
+ NULL,
+ NULL,
+ NULL,
+ NULL
+};
+#endif
+
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