1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001,2003 Networks Associates Technology, Inc. 5 * All rights reserved. 6 * 7 * This software was developed for the FreeBSD Project by ThinkSec AS and 8 * NAI Labs, the Security Research Division of Network Associates, Inc. 9 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 10 * DARPA CHATS research program. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. The name of the author may not be used to endorse or promote 21 * products derived from this software without specific prior written 22 * permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 44 #include <security/pam_appl.h> 45 #include <security/pam_modules.h> 46 #include <security/openpam.h> 47 48 static int 49 _pam_echo(pam_handle_t *pamh, int flags, 50 int argc, const char *argv[]) 51 { 52 char msg[PAM_MAX_MSG_SIZE]; 53 const void *str; 54 const char *p, *q; 55 int err, i, item; 56 size_t len; 57 58 if (flags & PAM_SILENT) 59 return (PAM_SUCCESS); 60 for (i = 0, len = 0; i < argc && len < sizeof(msg) - 1; ++i) { 61 if (i > 0) 62 msg[len++] = ' '; 63 for (p = argv[i]; *p != '\0' && len < sizeof(msg) - 1; ++p) { 64 if (*p != '%' || p[1] == '\0') { 65 msg[len++] = *p; 66 continue; 67 } 68 switch (*++p) { 69 case 'H': 70 item = PAM_RHOST; 71 break; 72 case 'h': 73 /* not implemented */ 74 item = -1; 75 break; 76 case 's': 77 item = PAM_SERVICE; 78 break; 79 case 't': 80 item = PAM_TTY; 81 break; 82 case 'U': 83 item = PAM_RUSER; 84 break; 85 case 'u': 86 item = PAM_USER; 87 break; 88 default: 89 item = -1; 90 msg[len++] = *p; 91 break; 92 } 93 if (item == -1) 94 continue; 95 err = pam_get_item(pamh, item, &str); 96 if (err != PAM_SUCCESS) 97 return (err); 98 if (str == NULL) 99 str = "(null)"; 100 for (q = str; *q != '\0' && len < sizeof(msg) - 1; ++q) 101 msg[len++] = *q; 102 } 103 } 104 msg[len] = '\0'; 105 return (pam_info(pamh, "%s", msg)); 106 } 107 108 PAM_EXTERN int 109 pam_sm_authenticate(pam_handle_t *pamh, int flags, 110 int argc, const char *argv[]) 111 { 112 113 return (_pam_echo(pamh, flags, argc, argv)); 114 } 115 116 PAM_EXTERN int 117 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused, 118 int argc __unused, const char *argv[] __unused) 119 { 120 121 return (PAM_SUCCESS); 122 } 123 124 PAM_EXTERN int 125 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, 126 int argc, const char *argv[]) 127 { 128 129 return (_pam_echo(pamh, flags, argc, argv)); 130 } 131 132 PAM_EXTERN int 133 pam_sm_open_session(pam_handle_t *pamh, int flags, 134 int argc, const char *argv[]) 135 { 136 137 return (_pam_echo(pamh, flags, argc, argv)); 138 } 139 140 PAM_EXTERN int 141 pam_sm_close_session(pam_handle_t *pamh, int flags, 142 int argc, const char *argv[]) 143 { 144 145 return (_pam_echo(pamh, flags, argc, argv)); 146 } 147 148 PAM_EXTERN int 149 pam_sm_chauthtok(pam_handle_t *pamh, int flags, 150 int argc, const char *argv[]) 151 { 152 153 if (flags & PAM_PRELIM_CHECK) 154 return (PAM_SUCCESS); 155 return (_pam_echo(pamh, flags, argc, argv)); 156 } 157 158 PAM_MODULE_ENTRY("pam_echo"); 159