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Now pam_alreadyloggedin lives in the ports.

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This commit is contained in:
Brian Feldman 2002-03-07 02:23:19 +00:00
parent a3133b5897
commit 30da7e6299
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=91772
4 changed files with 0 additions and 366 deletions
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1
lib/libpam/modules/modules.inc
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@ -1,7 +1,6 @@
# $FreeBSD$
MODULES =
MODULES += pam_alreadyloggedin
MODULES += pam_deny
MODULES += pam_ftp
.if defined(MAKE_KERBEROS4) && !defined(NOCRYPT) && !defined(NO_OPENSSL)

32
lib/libpam/modules/pam_alreadyloggedin/Makefile
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@ -1,32 +0,0 @@
# Copyright 1999 Max Khon.
# All rights reserved.
#
# 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.
#
# 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.
#
# $FreeBSD$
LIB= pam_alreadyloggedin
SHLIB_NAME= pam_alreadyloggedin.so
SRCS= pam_alreadyloggedin.c
MAN= pam_alreadyloggedin.8
.include <bsd.lib.mk>

99
lib/libpam/modules/pam_alreadyloggedin/pam_alreadyloggedin.8
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@ -1,99 +0,0 @@
.\" Copyright (c) 2002 Brian Fundakowski Feldman
.\" All rights reserved.
.\" Copyright (c) 2002 Networks Associates Technologies, Inc.
.\" 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.
.\"
.\" 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.
.\"
.\" $FreeBSD$
.\"
.Dd March 6, 2002
.Dt PAM_ALREADYLOGGEDIN 8
.Os
.Sh NAME
.Nm pam_alreadyloggedin
.Nd Already-logged-in PAM module
.Sh SYNOPSIS
.Op Ar service-name
.Ar module-type
.Ar control-flag
.Pa pam_alreadyloggedin
.Op Ar options
.Sh DESCRIPTION
The Already-logged-in authentication service module for PAM,
.Nm
provides functionality for only one PAM category:
authentication.
In terms of the
.Ar module-type
parameter, this is the
.Dq Li auth
feature.
It also provides null functions for other PAM categories.
.Ss Already-logged-in Authentication Module
The Already-logged-in authentication component
.Pq Fn pam_sm_authenticate ,
returns success if and only if the target user's ID is identical to a current login specified in the
.Xr utmp 5
database and verified with matching permissions on that login's respective terminal in
.Pa /dev .
If a user shows up in
.Xr w 8
output, they will generally be allowed to authenticate using this method.
.Pp
The following options may be passed to the authentication module:
.Bl -tag -width ".Cm restrict_tty Ns = Ns Ar ttyfoo*"
.It Cm no_root
Never allow login with a target user ID of zero.
.It Cm restrict_tty Ns = Ns Ar ttyglob*
Only allow login if the terminal device currently being authenticated on matches
.Ar ttyglob* .
The
.Ar ttyglob*
argument is specified as a shell glob, and checked using the
.Xr fnmatch 3
function.
.El
.Sh SEE ALSO
.Xr fnmatch 3 ,
.Xr getuid 2 ,
.Xr stat 2 ,
.Xr utmp 5 ,
.Xr w 8 ,
.Xr pam.conf 5 ,
.Xr pam 8
.Sh AUTHORS
The
.Nm
module and this manual page were developed for the FreeBSD Project by
NAI Labs and ThinkSec AS, the Security Research Division of Network
Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
.Pq Dq CBOSS ,
as part of the DARPA CHATS research program.

234
lib/libpam/modules/pam_alreadyloggedin/pam_alreadyloggedin.c
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@ -1,234 +0,0 @@
/*-
* Copyright (c) 2002 Brian Fundakowski Feldman
* Copyright (c) 2002 Networks Associates Technologies, Inc.
* All rights reserved.
*
* This software was developed by Robert Watson and Ilmar Habibulin for the
* TrustedBSD Project.
*
* This software was developed for the FreeBSD Project in part by 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 names of the authors may not 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.
*
* $FreeBSD$
*/
/*
* Implement a PAM module which will, given restrictions upon whether the
* user to be authenticated is root or logging in on a given terminal,
* will allow the user to be authenticated successfully if the user
* is currently already logged in on another terminal.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <err.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <utmp.h>
#include <security/pam_appl.h>
#include <security/pam_modules.h>
#include <security/pam_mod_misc.h>
enum { PAM_OPT_NO_ROOT = PAM_OPT_STD_MAX, PAM_OPT_RESTRICT_TTY };
static struct opttab other_options[] = {
{ "no_root", PAM_OPT_NO_ROOT },
{ "restrict_tty", PAM_OPT_RESTRICT_TTY },
{ NULL, 0 }
};
int getutmp(int *fd, struct utmp *utmp);
int inutmp(struct utmp *utmp, const char *username, uid_t uid);
PAM_EXTERN int
pam_sm_authenticate(pam_handle_t *pamh, int flags __unused, int argc,
const char **argv)
{
struct utmp utmp;
struct options options;
struct passwd *pw;
const char *logname;
char *lineglob = NULL;
unsigned int matched = 0;
int retval, fd = -1;
pam_std_option(&options, other_options, argc, argv);
PAM_LOG("Options processed");
retval = pam_get_user(pamh, &logname, NULL);
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
if (pam_test_option(&options, PAM_OPT_RESTRICT_TTY, &lineglob) &&
lineglob != NULL) {
const char *pam_tty;
PAM_LOG("Using a restrict_tty glob of `%s'", lineglob);
retval = pam_get_item(pamh, PAM_TTY, (const void **)&pam_tty);
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
if (fnmatch(lineglob, pam_tty, 0) != 0)
PAM_RETURN(PAM_AUTH_ERR);
}
pw = getpwnam(logname);
if (pw == NULL) {
warn("Can't look up user `%s'", logname);
PAM_RETURN(PAM_AUTH_ERR);
}
if (pw->pw_uid == 0 &&
pam_test_option(&options, PAM_OPT_NO_ROOT, NULL))
PAM_RETURN(PAM_AUTH_ERR);
while (getutmp(&fd, &utmp) == 1) {
if (inutmp(&utmp, logname, pw->pw_uid) == 1)
matched++;
}
if (matched)
PAM_RETURN(PAM_SUCCESS);
PAM_RETURN(PAM_AUTH_ERR);
}
PAM_EXTERN int
pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused, int argc,
const char **argv)
{
struct options options;
pam_std_option(&options, other_options, argc, argv);
PAM_LOG("Options processed");
PAM_RETURN(PAM_SUCCESS);
}
PAM_EXTERN int
pam_sm_acct_mgmt(pam_handle_t *pamh __unused, int flags __unused, int argc,
const char **argv)
{
struct options options;
pam_std_option(&options, NULL, argc, argv);
PAM_LOG("Options processed");
PAM_RETURN(PAM_IGNORE);
}
PAM_EXTERN int
pam_sm_chauthtok(pam_handle_t *pamh __unused, int flags __unused, int argc,
const char **argv)
{
struct options options;
pam_std_option(&options, NULL, argc, argv);
PAM_LOG("Options processed");
PAM_RETURN(PAM_IGNORE);
}
PAM_EXTERN int
pam_sm_open_session(pam_handle_t *pamh __unused, int flags __unused, int argc,
const char **argv)
{
struct options options;
pam_std_option(&options, NULL, argc, argv);
PAM_LOG("Options processed");
PAM_RETURN(PAM_IGNORE);
}
PAM_EXTERN int
pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, int argc,
const char **argv)
{
struct options options;
pam_std_option(&options, NULL, argc, argv);
PAM_LOG("Options processed");
PAM_RETURN(PAM_IGNORE);
}
PAM_MODULE_ENTRY("pam_alreadyloggedin");
int
getutmp(int *fd, struct utmp *utmp)
{
if (*fd == -1) {
*fd = open(_PATH_UTMP, O_RDONLY);
if (*fd == -1) {
warn("Failure opening %s", _PATH_UTMP);
return (-1);
}
}
if (read(*fd, utmp, sizeof(*utmp)) == sizeof(*utmp))
return (1);
(void)close(*fd);
return (0);
}
int
inutmp(struct utmp *utmp, const char *username, uid_t uid)
{
char ttypath[MAXPATHLEN];
struct stat sb;
if (utmp->ut_name[0] == '\0' || utmp->ut_line[0] == '\0')
return (0);
utmp->ut_line[sizeof(utmp->ut_line) - 1] = '\0';
utmp->ut_name[sizeof(utmp->ut_name) - 1] = '\0';
if (utmp->ut_line[strcspn(utmp->ut_line, "./")] != '\0') {
warnx("Evil utmp line: `%s'", utmp->ut_line);
return (-1);
}
if (*username && strcmp(username, utmp->ut_name) != 0)
return (0);
/* can't fail */
(void)snprintf(ttypath, sizeof(ttypath), "/dev/%s", utmp->ut_line);
if (stat(ttypath, &sb) == -1) {
warn("Can't stat line `%s'", ttypath);
return (-1);
}
if (sb.st_uid != uid) {
warnx("Line's uid %d does not match %d", sb.st_uid,
uid);
return (-1);
}
return (1);
}