e8c4b9d46b
up to par with the Linux pam_access(8). Like the Linux pam_access(8) our pam_login_access(8) is a service module for pam(3) that allows a administrator to limit access from specified remote hosts or terminals. Unlike the Linux pam_access, pam_login_access is missing some features which are added by this commit: Access file can now be specified. The default remains /etc/access.conf. The syntax is consistent with Linux pam_access. By default usernames are matched. If the username fails to match a match against a group name is attempted. The new nodefgroup module option will only match a username and no attempt to match a group name is made. Group names must be specified in brackets, "()" when nodefgroup is specified. Otherwise the old backward compatible behavior is used. This is consistent with Linux pam_access. A new field separator module option allows the replacement of the default colon (:) with any other character. This facilitates potential future specification of X displays. This is also consistent with Linux pam_access. A new list separator module option to replace the default space/comma/tab with another character. This too is consistent with Linux pam_access. Linux pam_access options not implemented in this commit are the debug and audit options. These will be implemented at a later date. Reviewed by: bjk, bcr (for manpages) Approved by: des (blanket, implicit) MFC after: 1 month Differential Revision: https://reviews.freebsd.org/D23198
132 lines
4.7 KiB
C
132 lines
4.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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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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*
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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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*
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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 <sys/types.h>
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#include <syslog.h>
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#include <unistd.h>
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#define PAM_SM_ACCOUNT
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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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#include <security/openpam.h>
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#include "pam_login_access.h"
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#define OPT_ACCESSFILE "accessfile"
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#define OPT_NOAUDIT "noaudit"
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#define OPT_FIELDSEP "fieldsep"
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#define OPT_LISTSEP "listsep"
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#define OPT_NODEFGROUP "nodefgroup"
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#define _PATH_LOGACCESS "/etc/login.access"
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#define _FIELD_SEPARATOR ":"
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#define _LIST_SEPARATOR ", \t"
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PAM_EXTERN int
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pam_sm_acct_mgmt(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 pam_login_access_options login_access_opts;
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const void *rhost, *tty, *user;
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char hostname[MAXHOSTNAMELEN];
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int pam_err;
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pam_err = pam_get_item(pamh, PAM_USER, &user);
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if (pam_err != PAM_SUCCESS)
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return (pam_err);
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if (user == NULL)
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return (PAM_SERVICE_ERR);
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PAM_LOG("Got user: %s", (const char *)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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return (pam_err);
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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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return (pam_err);
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gethostname(hostname, sizeof hostname);
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login_access_opts.defgroup = openpam_get_option(pamh, OPT_NODEFGROUP) == NULL ? true : false;
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login_access_opts.audit = openpam_get_option(pamh, OPT_NOAUDIT) == NULL ? true : false;
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if ((login_access_opts.accessfile = openpam_get_option(pamh, OPT_ACCESSFILE)) == NULL)
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login_access_opts.accessfile = _PATH_LOGACCESS;
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if ((login_access_opts.fieldsep = openpam_get_option(pamh, OPT_FIELDSEP)) == NULL)
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login_access_opts.fieldsep = _FIELD_SEPARATOR;
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if ((login_access_opts.listsep = openpam_get_option(pamh, OPT_LISTSEP)) == NULL)
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login_access_opts.listsep = _LIST_SEPARATOR;
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if (rhost != NULL && *(const char *)rhost != '\0') {
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PAM_LOG("Checking login.access for user %s from host %s",
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(const char *)user, (const char *)rhost);
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if (login_access(user, rhost, &login_access_opts) != 0)
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return (PAM_SUCCESS);
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PAM_VERBOSE_ERROR("%s is not allowed to log in from %s",
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(const char *)user, (const char *)rhost);
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} else if (tty != NULL && *(const char *)tty != '\0') {
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PAM_LOG("Checking login.access for user %s on tty %s",
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(const char *)user, (const char *)tty);
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if (login_access(user, tty, &login_access_opts) != 0)
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return (PAM_SUCCESS);
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PAM_VERBOSE_ERROR("%s is not allowed to log in on %s",
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(const char *)user, (const char *)tty);
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} else {
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PAM_LOG("Checking login.access for user %s",
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(const char *)user);
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if (login_access(user, "***unknown***", &login_access_opts) != 0)
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return (PAM_SUCCESS);
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PAM_VERBOSE_ERROR("%s is not allowed to log in",
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(const char *)user);
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}
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return (PAM_AUTH_ERR);
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}
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PAM_MODULE_ENTRY("pam_login_access");
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