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 * $FreeBSD: head/lib/libpam/modules/pam_echo/pam_echo.c 326219 2017-11-26 02:00:33Z pfg $ 37 */ 38 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 43 #include <security/pam_appl.h> 44 #include <security/pam_modules.h> 45 #include <security/openpam.h> 46 47 static int 48 _pam_echo(pam_handle_t *pamh, int flags, 49 int argc, const char *argv[]) 50 { 51 char msg[PAM_MAX_MSG_SIZE]; 52 const void *str; 53 const char *p, *q; 54 int err, i, item; 55 size_t len; 56 57 if (flags & PAM_SILENT) 58 return (PAM_SUCCESS); 59 for (i = 0, len = 0; i < argc && len < sizeof(msg) - 1; ++i) { 60 if (i > 0) 61 msg[len++] = ' '; 62 for (p = argv[i]; *p != '\0' && len < sizeof(msg) - 1; ++p) { 63 if (*p != '%' || p[1] == '\0') { 64 msg[len++] = *p; 65 continue; 66 } 67 switch (*++p) { 68 case 'H': 69 item = PAM_RHOST; 70 break; 71 case 'h': 72 /* not implemented */ 73 item = -1; 74 break; 75 case 's': 76 item = PAM_SERVICE; 77 break; 78 case 't': 79 item = PAM_TTY; 80 break; 81 case 'U': 82 item = PAM_RUSER; 83 break; 84 case 'u': 85 item = PAM_USER; 86 break; 87 default: 88 item = -1; 89 msg[len++] = *p; 90 break; 91 } 92 if (item == -1) 93 continue; 94 err = pam_get_item(pamh, item, &str); 95 if (err != PAM_SUCCESS) 96 return (err); 97 if (str == NULL) 98 str = "(null)"; 99 for (q = str; *q != '\0' && len < sizeof(msg) - 1; ++q) 100 msg[len++] = *q; 101 } 102 } 103 msg[len] = '\0'; 104 return (pam_info(pamh, "%s", msg)); 105 } 106 107 PAM_EXTERN int 108 pam_sm_authenticate(pam_handle_t *pamh, int flags, 109 int argc, const char *argv[]) 110 { 111 112 return (_pam_echo(pamh, flags, argc, argv)); 113 } 114 115 PAM_EXTERN int 116 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused, 117 int argc __unused, const char *argv[] __unused) 118 { 119 120 return (PAM_SUCCESS); 121 } 122 123 PAM_EXTERN int 124 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, 125 int argc, const char *argv[]) 126 { 127 128 return (_pam_echo(pamh, flags, argc, argv)); 129 } 130 131 PAM_EXTERN int 132 pam_sm_open_session(pam_handle_t *pamh, int flags, 133 int argc, const char *argv[]) 134 { 135 136 return (_pam_echo(pamh, flags, argc, argv)); 137 } 138 139 PAM_EXTERN int 140 pam_sm_close_session(pam_handle_t *pamh, int flags, 141 int argc, const char *argv[]) 142 { 143 144 return (_pam_echo(pamh, flags, argc, argv)); 145 } 146 147 PAM_EXTERN int 148 pam_sm_chauthtok(pam_handle_t *pamh, int flags, 149 int argc, const char *argv[]) 150 { 151 152 if (flags & PAM_PRELIM_CHECK) 153 return (PAM_SUCCESS); 154 return (_pam_echo(pamh, flags, argc, argv)); 155 } 156 157 PAM_MODULE_ENTRY("pam_echo"); 158