1 /*- 2 * Copyright (c) 2001,2003 Networks Associates Technology, Inc. 3 * All rights reserved. 4 * 5 * This software was developed for the FreeBSD Project by ThinkSec AS and 6 * NAI Labs, the Security Research Division of Network Associates, Inc. 7 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 8 * DARPA CHATS research program. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote 19 * products derived from this software without specific prior written 20 * permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $FreeBSD: src/lib/libpam/modules/pam_echo/pam_echo.c,v 1.4 2003/12/11 13:55:15 des Exp $ 35 */ 36 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 41 #include <security/pam_appl.h> 42 #include <security/pam_modules.h> 43 #include <security/openpam.h> 44 45 static int 46 _pam_echo(pam_handle_t *pamh, int flags, int argc, const char *argv[]) 47 { 48 char msg[PAM_MAX_MSG_SIZE]; 49 const void *str; 50 const char *p, *q; 51 int err, i, item; 52 size_t len; 53 54 if (flags & PAM_SILENT) 55 return (PAM_SUCCESS); 56 for (i = 0, len = 0; i < argc && len < sizeof(msg) - 1; ++i) { 57 if (i > 0) 58 msg[len++] = ' '; 59 for (p = argv[i]; *p != '\0' && len < sizeof(msg) - 1; ++p) { 60 if (*p != '%' || p[1] == '\0') { 61 msg[len++] = *p; 62 continue; 63 } 64 switch (*++p) { 65 case 'H': 66 item = PAM_RHOST; 67 break; 68 case 'h': 69 /* not implemented */ 70 item = -1; 71 break; 72 case 's': 73 item = PAM_SERVICE; 74 break; 75 case 't': 76 item = PAM_TTY; 77 break; 78 case 'U': 79 item = PAM_RUSER; 80 break; 81 case 'u': 82 item = PAM_USER; 83 break; 84 default: 85 item = -1; 86 msg[len++] = *p; 87 break; 88 } 89 if (item == -1) 90 continue; 91 err = pam_get_item(pamh, item, &str); 92 if (err != PAM_SUCCESS) 93 return (err); 94 if (str == NULL) 95 str = "(null)"; 96 for (q = str; *q != '\0' && len < sizeof(msg) - 1; ++q) 97 msg[len++] = *q; 98 } 99 } 100 msg[len] = '\0'; 101 return (pam_info(pamh, "%s", msg)); 102 } 103 104 PAM_EXTERN int 105 pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc, const char *argv[]) 106 { 107 108 return (_pam_echo(pamh, flags, argc, argv)); 109 } 110 111 PAM_EXTERN int 112 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused, 113 int argc __unused, const char *argv[] __unused) 114 { 115 116 return (PAM_SUCCESS); 117 } 118 119 PAM_EXTERN int 120 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc, const char *argv[]) 121 { 122 123 return (_pam_echo(pamh, flags, argc, argv)); 124 } 125 126 PAM_EXTERN int 127 pam_sm_open_session(pam_handle_t *pamh, int flags, int argc, const char *argv[]) 128 { 129 130 return (_pam_echo(pamh, flags, argc, argv)); 131 } 132 133 PAM_EXTERN int 134 pam_sm_close_session(pam_handle_t *pamh, int flags, 135 int argc, const char *argv[]) 136 { 137 138 return (_pam_echo(pamh, flags, argc, argv)); 139 } 140 141 PAM_EXTERN int 142 pam_sm_chauthtok(pam_handle_t *pamh, int flags, int argc, const char *argv[]) 143 { 144 145 if (flags & PAM_PRELIM_CHECK) 146 return (PAM_SUCCESS); 147 return (_pam_echo(pamh, flags, argc, argv)); 148 } 149 150 PAM_MODULE_ENTRY("pam_echo"); 151