f1b61fc829
Some consumers of PAM remove the /dev/ component (i.e. login), while others don't (i.e. su). We must ensure that the /dev/ component is removed to ensure that the utmpx entries properly work with tools such as w(1). Discussed with: des MFC after: 1 week
183 lines
5.3 KiB
C
183 lines
5.3 KiB
C
/*-
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* Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 2001 Mark R V Murray
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* All rights reserved.
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* Copyright (c) 2001 Networks Associates Technology, Inc.
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* All rights reserved.
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* Copyright (c) 2004 Joe R. Doupnik
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* All rights reserved.
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*
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* Portions of this software were developed for the FreeBSD Project by
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* ThinkSec AS and NAI Labs, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
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* ("CBOSS"), as part of the DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#define _BSD_SOURCE
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#include <sys/time.h>
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#include <paths.h>
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#include <pwd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <utmpx.h>
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#define PAM_SM_SESSION
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#include <security/pam_appl.h>
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#include <security/pam_modules.h>
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#include <security/pam_mod_misc.h>
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#define PAM_UTMPX_ID "utmpx_id"
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PAM_EXTERN int
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pam_sm_open_session(pam_handle_t *pamh, int flags,
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int argc __unused, const char *argv[] __unused)
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{
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struct passwd *pwd;
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struct utmpx *utx, utl;
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time_t t;
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const char *user;
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const void *rhost, *tty;
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char *id;
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int pam_err;
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pam_err = pam_get_user(pamh, &user, NULL);
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if (pam_err != PAM_SUCCESS)
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return (pam_err);
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if (user == NULL || (pwd = getpwnam(user)) == NULL)
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return (PAM_SERVICE_ERR);
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PAM_LOG("Got user: %s", user);
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pam_err = pam_get_item(pamh, PAM_RHOST, &rhost);
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if (pam_err != PAM_SUCCESS) {
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PAM_LOG("No PAM_RHOST");
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goto err;
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}
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pam_err = pam_get_item(pamh, PAM_TTY, &tty);
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if (pam_err != PAM_SUCCESS) {
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PAM_LOG("No PAM_TTY");
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goto err;
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}
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if (tty == NULL) {
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PAM_LOG("No PAM_TTY");
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pam_err = PAM_SERVICE_ERR;
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goto err;
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}
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/* Strip /dev/ component. */
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if (strncmp(tty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
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tty = (const char *)tty + sizeof(_PATH_DEV) - 1;
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if ((flags & PAM_SILENT) == 0) {
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if (setutxdb(UTXDB_LASTLOGIN, NULL) != 0) {
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PAM_LOG("Failed to open lastlogin database");
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} else {
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utx = getutxuser(user);
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if (utx != NULL && utx->ut_type == USER_PROCESS) {
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t = utx->ut_tv.tv_sec;
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if (*utx->ut_host != '\0')
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pam_info(pamh, "Last login: %.*s from %s",
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24 - 5, ctime(&t), utx->ut_host);
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else
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pam_info(pamh, "Last login: %.*s on %s",
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24 - 5, ctime(&t), utx->ut_line);
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}
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endutxent();
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}
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}
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id = malloc(sizeof utl.ut_id);
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if (id == NULL) {
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pam_err = PAM_SERVICE_ERR;
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goto err;
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}
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arc4random_buf(id, sizeof utl.ut_id);
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pam_err = pam_set_data(pamh, PAM_UTMPX_ID, id, openpam_free_data);
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if (pam_err != PAM_SUCCESS) {
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free(id);
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goto err;
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}
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memset(&utl, 0, sizeof utl);
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utl.ut_type = USER_PROCESS;
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memcpy(utl.ut_id, id, sizeof utl.ut_id);
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strncpy(utl.ut_user, user, sizeof utl.ut_user);
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strncpy(utl.ut_line, tty, sizeof utl.ut_line);
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if (rhost != NULL)
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strncpy(utl.ut_host, rhost, sizeof utl.ut_host);
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utl.ut_pid = getpid();
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gettimeofday(&utl.ut_tv, NULL);
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pututxline(&utl);
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return (PAM_SUCCESS);
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err:
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if (openpam_get_option(pamh, "no_fail"))
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return (PAM_SUCCESS);
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return (pam_err);
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}
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PAM_EXTERN int
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pam_sm_close_session(pam_handle_t *pamh, int flags __unused,
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int argc __unused, const char *argv[] __unused)
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{
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struct utmpx utl;
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const void *id;
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int pam_err;
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pam_err = pam_get_data(pamh, PAM_UTMPX_ID, (const void **)&id);
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if (pam_err != PAM_SUCCESS)
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goto err;
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memset(&utl, 0, sizeof utl);
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utl.ut_type = DEAD_PROCESS;
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memcpy(utl.ut_id, id, sizeof utl.ut_id);
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utl.ut_pid = getpid();
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gettimeofday(&utl.ut_tv, NULL);
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pututxline(&utl);
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return (PAM_SUCCESS);
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err:
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if (openpam_get_option(pamh, "no_fail"))
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return (PAM_SUCCESS);
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return (pam_err);
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}
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PAM_MODULE_ENTRY("pam_lastlog");
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