1 /* $NetBSD: pam_echo.c,v 1.2 2004/12/12 08:18:44 christos Exp $ */ 2 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 #ifdef __FreeBSD__ 39 __FBSDID("$FreeBSD: src/lib/libpam/modules/pam_echo/pam_echo.c,v 1.4 2003/12/11 13:55:15 des Exp $"); 40 #else 41 __RCSID("$NetBSD: pam_echo.c,v 1.2 2004/12/12 08:18:44 christos Exp $"); 42 #endif 43 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 48 #include <security/pam_appl.h> 49 #include <security/pam_modules.h> 50 #include <security/openpam.h> 51 52 static int 53 _pam_echo(pam_handle_t *pamh, int flags, 54 int argc, const char *argv[]) 55 { 56 char msg[PAM_MAX_MSG_SIZE]; 57 const void *str; 58 const char *p, *q; 59 int err, i, item; 60 size_t len; 61 62 if (flags & PAM_SILENT) 63 return (PAM_SUCCESS); 64 for (i = 0, len = 0; i < argc && len < sizeof(msg) - 1; ++i) { 65 if (i > 0) 66 msg[len++] = ' '; 67 for (p = argv[i]; *p != '\0' && len < sizeof(msg) - 1; ++p) { 68 if (*p != '%' || p[1] == '\0') { 69 msg[len++] = *p; 70 continue; 71 } 72 switch (*++p) { 73 case 'H': 74 item = PAM_RHOST; 75 break; 76 case 'h': 77 /* not implemented */ 78 item = -1; 79 break; 80 case 's': 81 item = PAM_SERVICE; 82 break; 83 case 't': 84 item = PAM_TTY; 85 break; 86 case 'U': 87 item = PAM_RUSER; 88 break; 89 case 'u': 90 item = PAM_USER; 91 break; 92 default: 93 item = -1; 94 msg[len++] = *p; 95 break; 96 } 97 if (item == -1) 98 continue; 99 err = pam_get_item(pamh, item, &str); 100 if (err != PAM_SUCCESS) 101 return (err); 102 if (str == NULL) 103 str = "(null)"; 104 for (q = str; *q != '\0' && len < sizeof(msg) - 1; ++q) 105 msg[len++] = *q; 106 } 107 } 108 msg[len] = '\0'; 109 return (pam_info(pamh, "%s", msg)); 110 } 111 112 PAM_EXTERN int 113 pam_sm_authenticate(pam_handle_t *pamh, int flags, 114 int argc, const char *argv[]) 115 { 116 117 return (_pam_echo(pamh, flags, argc, argv)); 118 } 119 120 PAM_EXTERN int 121 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused, 122 int argc __unused, const char *argv[] __unused) 123 { 124 125 return (PAM_SUCCESS); 126 } 127 128 PAM_EXTERN int 129 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, 130 int argc, const char *argv[]) 131 { 132 133 return (_pam_echo(pamh, flags, argc, argv)); 134 } 135 136 PAM_EXTERN int 137 pam_sm_open_session(pam_handle_t *pamh, int flags, 138 int argc, const char *argv[]) 139 { 140 141 return (_pam_echo(pamh, flags, argc, argv)); 142 } 143 144 PAM_EXTERN int 145 pam_sm_close_session(pam_handle_t *pamh, int flags, 146 int argc, const char *argv[]) 147 { 148 149 return (_pam_echo(pamh, flags, argc, argv)); 150 } 151 152 PAM_EXTERN int 153 pam_sm_chauthtok(pam_handle_t *pamh, int flags, 154 int argc, const char *argv[]) 155 { 156 157 if (flags & PAM_PRELIM_CHECK) 158 return (PAM_SUCCESS); 159 return (_pam_echo(pamh, flags, argc, argv)); 160 } 161 162 PAM_MODULE_ENTRY("pam_echo"); 163