1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2002 Danny Braniss 5 * All rights reserved. 6 * Copyright (c) 2001,2002 Networks Associates Technology, Inc. 7 * All rights reserved. 8 * 9 * Portions of this software were developed for the FreeBSD Project by 10 * ThinkSec AS and NAI Labs, the Security Research Division of Network 11 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 12 * ("CBOSS"), as part of the DARPA CHATS research program. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. The name of the author may not be used to endorse or promote 23 * products derived from this software without specific prior written 24 * permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * $FreeBSD: head/lib/libpam/modules/pam_rhosts/pam_rhosts.c 326219 2017-11-26 02:00:33Z pfg $ 39 */ 40 41 #include <pwd.h> 42 #include <stddef.h> 43 #include <string.h> 44 #include <unistd.h> 45 46 #define PAM_SM_AUTH 47 #include <security/pam_appl.h> 48 #include <security/pam_modules.h> 49 #include <security/pam_mod_misc.h> 50 51 #define OPT_ALLOW_ROOT "allow_root" 52 53 PAM_EXTERN int 54 pam_sm_authenticate(pam_handle_t *pamh, int flags __unused, 55 int argc __unused, const char *argv[] __unused) 56 { 57 struct passwd *pw; 58 const char *user; 59 const void *ruser, *rhost; 60 int err, superuser; 61 62 err = pam_get_user(pamh, &user, NULL); 63 if (err != PAM_SUCCESS) 64 return (err); 65 66 if ((pw = getpwnam(user)) == NULL) 67 return (PAM_USER_UNKNOWN); 68 if (pw->pw_uid == 0 && 69 openpam_get_option(pamh, OPT_ALLOW_ROOT) == NULL) 70 return (PAM_AUTH_ERR); 71 72 err = pam_get_item(pamh, PAM_RUSER, &ruser); 73 if (err != PAM_SUCCESS) 74 return (PAM_AUTH_ERR); 75 76 err = pam_get_item(pamh, PAM_RHOST, &rhost); 77 if (err != PAM_SUCCESS) 78 return (PAM_AUTH_ERR); 79 80 superuser = (strcmp(user, "root") == 0); 81 err = ruserok(rhost, superuser, ruser, user); 82 if (err != 0) 83 return (PAM_AUTH_ERR); 84 85 return (PAM_SUCCESS); 86 } 87 88 PAM_EXTERN int 89 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused, 90 int argc __unused, const char *argv[] __unused) 91 { 92 93 return (PAM_SUCCESS); 94 } 95 96 PAM_MODULE_ENTRY("pam_rhosts"); 97