208 lines
6.1 KiB
C
208 lines
6.1 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/param.h>
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#include <fcntl.h>
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#include <libutil.h>
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#include <paths.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <time.h>
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#include <unistd.h>
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#include <utmp.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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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 utmp utmp;
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struct lastlog ll;
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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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off_t llpos;
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int fd, 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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if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0)
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tty = (const char *)tty + strlen(_PATH_DEV);
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if (*(const char *)tty == '\0')
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return (PAM_SERVICE_ERR);
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fd = open(_PATH_LASTLOG, O_RDWR|O_CREAT, 0644);
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if (fd == -1) {
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PAM_LOG("Failed to open %s", _PATH_LASTLOG);
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goto file_err;
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}
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/*
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* Record session in lastlog(5).
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*/
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llpos = (off_t)(pwd->pw_uid * sizeof(ll));
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if (lseek(fd, llpos, L_SET) != llpos)
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goto file_err;
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if ((flags & PAM_SILENT) == 0) {
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if (read(fd, &ll, sizeof ll) == sizeof ll && ll.ll_time != 0) {
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t = ll.ll_time;
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if (*ll.ll_host != '\0')
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pam_info(pamh, "Last login: %.*s from %.*s",
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24 - 5, ctime(&t),
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(int)sizeof(ll.ll_host), ll.ll_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),
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(int)sizeof(ll.ll_line), ll.ll_line);
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}
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if (lseek(fd, llpos, L_SET) != llpos)
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goto file_err;
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}
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bzero(&ll, sizeof(ll));
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ll.ll_time = time(NULL);
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/* note: does not need to be NUL-terminated */
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strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
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if (rhost != NULL && *(const char *)rhost != '\0')
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/* note: does not need to be NUL-terminated */
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strncpy(ll.ll_host, rhost, sizeof(ll.ll_host));
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if (write(fd, (char *)&ll, sizeof(ll)) != sizeof(ll) || close(fd) != 0)
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goto file_err;
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PAM_LOG("Login recorded in %s", _PATH_LASTLOG);
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/*
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* Record session in utmp(5) and wtmp(5).
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*/
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bzero(&utmp, sizeof(utmp));
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utmp.ut_time = time(NULL);
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/* note: does not need to be NUL-terminated */
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strncpy(utmp.ut_name, user, sizeof(utmp.ut_name));
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if (rhost != NULL && *(const char *)rhost != '\0')
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strncpy(utmp.ut_host, rhost, sizeof(utmp.ut_host));
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(void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
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login(&utmp);
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return (PAM_SUCCESS);
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file_err:
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syslog(LOG_ERR, "%s: %m", _PATH_LASTLOG);
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if (fd != -1)
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close(fd);
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pam_err = PAM_SYSTEM_ERR;
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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 __unused, int flags __unused,
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int argc __unused, const char *argv[] __unused)
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{
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const void *tty;
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int pam_err;
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pam_err = pam_get_item(pamh, PAM_TTY, (const void **)&tty);
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if (pam_err != PAM_SUCCESS)
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goto err;
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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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if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0)
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tty = (const char *)tty + strlen(_PATH_DEV);
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if (*(const char *)tty == '\0')
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return (PAM_SERVICE_ERR);
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if (logout(tty) != 1)
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syslog(LOG_ERR, "%s(): no utmp record for %s",
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__func__, (const char *)tty);
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logwtmp(tty, "", "");
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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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