58d6bdcbe0
the nologin(5) file is located and whether the user may bypass its restriction. Add some error checks. Approved by: des PR: bin/107612
128 lines
3.6 KiB
C
128 lines
3.6 KiB
C
/*-
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* Copyright 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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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <login_cap.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 <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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#define _PATH_NOLOGIN "/var/run/nologin"
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static char nologin_def[] = _PATH_NOLOGIN;
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PAM_EXTERN int
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pam_sm_acct_mgmt(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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login_cap_t *lc;
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struct passwd *pwd;
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struct stat st;
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int retval, fd;
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ssize_t ss;
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const char *user, *nologin;
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char *mtmp;
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retval = pam_get_user(pamh, &user, NULL);
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if (retval != PAM_SUCCESS)
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return (retval);
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PAM_LOG("Got user: %s", user);
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pwd = getpwnam(user);
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if (pwd == NULL)
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return (PAM_USER_UNKNOWN);
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/*
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* login_getpwclass(3) will select the "root" class by default
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* if pwd->pw_uid is 0. That class should have "ignorenologin"
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* capability so that super-user can bypass nologin.
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*/
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lc = login_getpwclass(pwd);
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if (lc == NULL) {
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PAM_LOG("Unable to get login class for user %s", user);
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return (PAM_SERVICE_ERR);
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}
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if (login_getcapbool(lc, "ignorenologin", 0)) {
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login_close(lc);
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return (PAM_SUCCESS);
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}
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nologin = login_getcapstr(lc, "nologin", nologin_def, nologin_def);
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fd = open(nologin, O_RDONLY, 0);
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if (fd < 0) {
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login_close(lc);
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return (PAM_SUCCESS);
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}
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PAM_LOG("Opened %s file", nologin);
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if (fstat(fd, &st) == 0) {
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mtmp = malloc(st.st_size + 1);
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if (mtmp != NULL) {
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ss = read(fd, mtmp, st.st_size);
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if (ss > 0) {
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mtmp[ss] = '\0';
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pam_error(pamh, "%s", mtmp);
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}
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free(mtmp);
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}
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}
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PAM_VERBOSE_ERROR("Administrator refusing you: %s", nologin);
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close(fd);
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login_close(lc);
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return (PAM_AUTH_ERR);
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}
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PAM_MODULE_ENTRY("pam_nologin");
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