diff options
Diffstat (limited to 'lib/libpam/modules/pam_lastlog/pam_lastlog.c')
| -rw-r--r-- | lib/libpam/modules/pam_lastlog/pam_lastlog.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/lib/libpam/modules/pam_lastlog/pam_lastlog.c b/lib/libpam/modules/pam_lastlog/pam_lastlog.c new file mode 100644 index 000000000000..e631723f6e76 --- /dev/null +++ b/lib/libpam/modules/pam_lastlog/pam_lastlog.c @@ -0,0 +1,180 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * Copyright (c) 2001 Mark R V Murray + * All rights reserved. + * Copyright (c) 2001 Networks Associates Technology, Inc. + * All rights reserved. + * Copyright (c) 2004 Joe R. Doupnik + * All rights reserved. + * + * Portions of this software were developed for the FreeBSD Project by + * ThinkSec AS and NAI Labs, the Security Research Division of Network + * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 + * ("CBOSS"), as part of the DARPA CHATS research program. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior written + * permission. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +#define _BSD_SOURCE + +#include <sys/time.h> + +#include <paths.h> +#include <stdlib.h> +#include <string.h> +#include <time.h> +#include <unistd.h> +#include <utmpx.h> + +#define PAM_SM_SESSION + +#include <security/pam_appl.h> +#include <security/pam_modules.h> +#include <security/pam_mod_misc.h> + +#define PAM_UTMPX_ID "utmpx_id" + +PAM_EXTERN int +pam_sm_open_session(pam_handle_t *pamh, int flags, + int argc __unused, const char *argv[] __unused) +{ + struct utmpx *utx, utl; + time_t t; + const char *user; + const void *rhost, *tty; + char *id; + int pam_err; + + pam_err = pam_get_user(pamh, &user, NULL); + if (pam_err != PAM_SUCCESS) + return (pam_err); + if (user == NULL) + return (PAM_SERVICE_ERR); + PAM_LOG("Got user: %s", user); + + pam_err = pam_get_item(pamh, PAM_RHOST, &rhost); + if (pam_err != PAM_SUCCESS) { + PAM_LOG("No PAM_RHOST"); + goto err; + } + pam_err = pam_get_item(pamh, PAM_TTY, &tty); + if (pam_err != PAM_SUCCESS) { + PAM_LOG("No PAM_TTY"); + goto err; + } + if (tty == NULL) { + PAM_LOG("No PAM_TTY"); + pam_err = PAM_SERVICE_ERR; + goto err; + } + /* Strip /dev/ component. */ + if (strncmp(tty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0) + tty = (const char *)tty + sizeof(_PATH_DEV) - 1; + + if ((flags & PAM_SILENT) == 0) { + if (setutxdb(UTXDB_LASTLOGIN, NULL) != 0) { + PAM_LOG("Failed to open lastlogin database"); + } else { + utx = getutxuser(user); + if (utx != NULL && utx->ut_type == USER_PROCESS) { + t = utx->ut_tv.tv_sec; + if (*utx->ut_host != '\0') + pam_info(pamh, "Last login: %.*s from %s", + 24 - 5, ctime(&t), utx->ut_host); + else + pam_info(pamh, "Last login: %.*s on %s", + 24 - 5, ctime(&t), utx->ut_line); + } + endutxent(); + } + } + + id = malloc(sizeof utl.ut_id); + if (id == NULL) { + pam_err = PAM_SERVICE_ERR; + goto err; + } + arc4random_buf(id, sizeof utl.ut_id); + + pam_err = pam_set_data(pamh, PAM_UTMPX_ID, id, openpam_free_data); + if (pam_err != PAM_SUCCESS) { + free(id); + goto err; + } + + memset(&utl, 0, sizeof utl); + utl.ut_type = USER_PROCESS; + memcpy(utl.ut_id, id, sizeof utl.ut_id); + strncpy(utl.ut_user, user, sizeof utl.ut_user); + strncpy(utl.ut_line, tty, sizeof utl.ut_line); + if (rhost != NULL) + strncpy(utl.ut_host, rhost, sizeof utl.ut_host); + utl.ut_pid = getpid(); + gettimeofday(&utl.ut_tv, NULL); + pututxline(&utl); + + return (PAM_SUCCESS); + +err: + if (openpam_get_option(pamh, "no_fail")) + return (PAM_SUCCESS); + return (pam_err); +} + +PAM_EXTERN int +pam_sm_close_session(pam_handle_t *pamh, int flags __unused, + int argc __unused, const char *argv[] __unused) +{ + struct utmpx utl; + const void *id; + int pam_err; + + pam_err = pam_get_data(pamh, PAM_UTMPX_ID, (const void **)&id); + if (pam_err != PAM_SUCCESS) + goto err; + + memset(&utl, 0, sizeof utl); + utl.ut_type = DEAD_PROCESS; + memcpy(utl.ut_id, id, sizeof utl.ut_id); + utl.ut_pid = getpid(); + gettimeofday(&utl.ut_tv, NULL); + pututxline(&utl); + + return (PAM_SUCCESS); + + err: + if (openpam_get_option(pamh, "no_fail")) + return (PAM_SUCCESS); + return (pam_err); +} + +PAM_MODULE_ENTRY("pam_lastlog"); |