pam_smbpass/pam_smb_acct.c

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/* 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_ACCT

#include "includes.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"


/*
 * pam_sm_acct_mgmt() verifies whether or not the account is disabled.
 *
 */

int pam_sm_acct_mgmt( pam_handle_t *pamh, int flags,
                      int argc, const char **argv )
{
        unsigned int ctrl;
        int retval;

        const char *name;
        struct samu *sampass = NULL;
        void (*oldsig_handler)(int);
        extern BOOL in_client;

        /* Samba initialization. */
        load_case_tables();
        setup_logging( "pam_smbpass", False );
        in_client = True;

        ctrl = set_ctrl( flags, argc, argv );

        /* get the username */

        retval = pam_get_user( pamh, &name, "Username: " );
        if (retval != PAM_SUCCESS) {
                if (on( SMB_DEBUG, ctrl )) {
                        _log_err( LOG_DEBUG, "acct: could not identify user" );
                }
                return retval;
        }
        if (on( SMB_DEBUG, ctrl )) {
                _log_err( LOG_DEBUG, "acct: username [%s] obtained", name );
        }

        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(True)) {
                _log_err( LOG_ALERT, "Cannot access samba password database" );
                CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
                return PAM_AUTHINFO_UNAVAIL;
        }

        /* Get the user's record. */

        if (!(sampass = samu_new( NULL ))) {
                CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
                /* malloc fail. */
                return nt_status_to_pam(NT_STATUS_NO_MEMORY);
        }

        if (!pdb_getsampwnam(sampass, name )) {
                _log_err( LOG_DEBUG, "acct: could not identify user" );
                CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
                return PAM_USER_UNKNOWN;
        }

        /* check for lookup failure */
        if (!strlen(pdb_get_username(sampass)) ) {
                CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
                return PAM_USER_UNKNOWN;
        }

        if (pdb_get_acct_ctrl(sampass) & ACB_DISABLED) {
                if (on( SMB_DEBUG, ctrl )) {
                        _log_err( LOG_DEBUG
                                , "acct: account %s is administratively disabled", name );
                }
                make_remark( pamh, ctrl, PAM_ERROR_MSG
                        , "Your account has been disabled; "
                        "please see your system administrator." );

                CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
                return PAM_ACCT_EXPIRED;
        }

        /* TODO: support for expired passwords. */

        CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
        return PAM_SUCCESS;
}

/* static module data */
#ifdef PAM_STATIC
struct pam_module _pam_smbpass_acct_modstruct = {
     "pam_smbpass",
     NULL,
     NULL,
     pam_sm_acct_mgmt,
     NULL,
     NULL,
     NULL
};
#endif

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