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 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 42 #include <security/pam_appl.h> 43 #include <security/pam_modules.h> 44 #include <security/openpam.h> 45 46 static int 47 _pam_echo(pam_handle_t *pamh, int flags, 48 int argc, const char *argv[]) 49 { 50 char msg[PAM_MAX_MSG_SIZE]; 51 const char *str, *p, *q; 52 int err, i, item; 53 size_t len; 54 55 if (flags & PAM_SILENT) 56 return (PAM_SUCCESS); 57 for (i = 0, len = 0; i < argc && len < sizeof(msg) - 1; ++i) { 58 if (i > 0) 59 msg[len++] = ' '; 60 for (p = argv[i]; *p != '\0' && len < sizeof(msg) - 1; ++p) { 61 if (*p != '%' || p[1] == '\0') { 62 msg[len++] = *p; 63 continue; 64 } 65 switch (*++p) { 66 case 'H': 67 item = PAM_RHOST; 68 break; 69 case 'h': 70 /* not implemented */ 71 item = -1; 72 break; 73 case 's': 74 item = PAM_SERVICE; 75 break; 76 case 't': 77 item = PAM_TTY; 78 break; 79 case 'U': 80 item = PAM_RUSER; 81 break; 82 case 'u': 83 item = PAM_USER; 84 break; 85 default: 86 item = -1; 87 msg[len++] = *p; 88 break; 89 } 90 if (item == -1) 91 continue; 92 err = pam_get_item(pamh, item, (const void **)&str); 93 if (err != PAM_SUCCESS) 94 return (err); 95 if (str == NULL) 96 str = "(null)"; 97 for (q = str; *q != '\0' && len < sizeof(msg) - 1; ++q) 98 msg[len++] = *q; 99 } 100 } 101 msg[len] = '\0'; 102 return (pam_info(pamh, "%s", msg)); 103 } 104 105 PAM_EXTERN int 106 pam_sm_authenticate(pam_handle_t *pamh, int flags, 107 int argc, const char *argv[]) 108 { 109 110 return (_pam_echo(pamh, flags, argc, argv)); 111 } 112 113 PAM_EXTERN int 114 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused, 115 int argc __unused, const char *argv[] __unused) 116 { 117 118 return (PAM_SUCCESS); 119 } 120 121 PAM_EXTERN int 122 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, 123 int argc, const char *argv[]) 124 { 125 126 return (_pam_echo(pamh, flags, argc, argv)); 127 } 128 129 PAM_EXTERN int 130 pam_sm_open_session(pam_handle_t *pamh, int flags, 131 int argc, const char *argv[]) 132 { 133 134 return (_pam_echo(pamh, flags, argc, argv)); 135 } 136 137 PAM_EXTERN int 138 pam_sm_close_session(pam_handle_t *pamh, int flags, 139 int argc, const char *argv[]) 140 { 141 142 return (_pam_echo(pamh, flags, argc, argv)); 143 } 144 145 PAM_EXTERN int 146 pam_sm_chauthtok(pam_handle_t *pamh, int flags, 147 int argc, const char *argv[]) 148 { 149 150 if (flags & PAM_PRELIM_CHECK) 151 return (PAM_SUCCESS); 152 return (_pam_echo(pamh, flags, argc, argv)); 153 } 154 155 PAM_MODULE_ENTRY("pam_echo"); 156