1/*- 2 * Copyright (c) 2002 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 * $P4: //depot/projects/openpam/lib/pam_get_authtok.c#17 $ 35 */ 36 37#include <sys/param.h> 38 39#include <stdlib.h>
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41 42#include <security/pam_appl.h> 43#include <security/openpam.h> 44 45#include "openpam_impl.h" 46 47const char authtok_prompt[] = "Password:"; 48const char oldauthtok_prompt[] = "Old Password:"; 49const char newauthtok_prompt[] = "New Password:"; 50 51/* 52 * OpenPAM extension 53 * 54 * Retrieve authentication token 55 */ 56 57int 58pam_get_authtok(pam_handle_t *pamh, 59 int item, 60 const char **authtok, 61 const char *prompt) 62{ 63 const void *oldauthtok; 64 const char *default_prompt; 65 char *resp, *resp2; 66 int pitem, r, style, twice; 67 68 if (pamh == NULL || authtok == NULL) 69 return (PAM_SYSTEM_ERR); 70 71 *authtok = NULL; 72 twice = 0; 73 switch (item) { 74 case PAM_AUTHTOK: 75 pitem = PAM_AUTHTOK_PROMPT; 76 default_prompt = authtok_prompt; 77 r = pam_get_item(pamh, PAM_OLDAUTHTOK, &oldauthtok); 78 if (r == PAM_SUCCESS && oldauthtok != NULL) { 79 default_prompt = newauthtok_prompt; 80 twice = 1; 81 } 82 break; 83 case PAM_OLDAUTHTOK: 84 pitem = PAM_OLDAUTHTOK_PROMPT; 85 default_prompt = oldauthtok_prompt; 86 twice = 0; 87 break; 88 default: 89 return (PAM_SYMBOL_ERR); 90 } 91 92 if (openpam_get_option(pamh, "try_first_pass") || 93 openpam_get_option(pamh, "use_first_pass")) { 94 r = pam_get_item(pamh, item, (const void **)authtok); 95 if (r == PAM_SUCCESS && *authtok != NULL) 96 return (PAM_SUCCESS); 97 else if (openpam_get_option(pamh, "use_first_pass")) 98 return (r == PAM_SUCCESS ? PAM_AUTH_ERR : r); 99 } 100 if (prompt == NULL) { 101 r = pam_get_item(pamh, pitem, (const void **)&prompt); 102 if (r != PAM_SUCCESS || prompt == NULL) 103 prompt = default_prompt; 104 } 105 style = openpam_get_option(pamh, "echo_pass") ? 106 PAM_PROMPT_ECHO_ON : PAM_PROMPT_ECHO_OFF; 107 r = pam_prompt(pamh, style, &resp, "%s", prompt); 108 if (r != PAM_SUCCESS) 109 return (r); 110 if (twice) { 111 r = pam_prompt(pamh, style, &resp2, "Retype %s", prompt); 112 if (r != PAM_SUCCESS) { 113 free(resp); 114 return (r); 115 } 116 if (strcmp(resp, resp2) != 0) { 117 free(resp); 118 resp = NULL; 119 } 120 free(resp2); 121 } 122 if (resp == NULL) 123 return (PAM_TRY_AGAIN); 124 r = pam_set_item(pamh, item, resp); 125 free(resp); 126 if (r != PAM_SUCCESS) 127 return (r); 128 return (pam_get_item(pamh, item, (const void **)authtok)); 129} 130 131/* 132 * Error codes: 133 * 134 * =pam_get_item 135 * =pam_prompt 136 * =pam_set_item 137 * !PAM_SYMBOL_ERR 138 * PAM_TRY_AGAIN 139 */ 140 141/** 142 * The =pam_get_authtok function returns the cached authentication token, 143 * or prompts the user if no token is currently cached. Either way, a 144 * pointer to the authentication token is stored in the location pointed 145 * to by the =authtok argument. 146 * 147 * The =item argument must have one of the following values: 148 * 149 * =PAM_AUTHTOK: 150 * Returns the current authentication token, or the new token 151 * when changing authentication tokens. 152 * =PAM_OLDAUTHTOK: 153 * Returns the previous authentication token when changing 154 * authentication tokens. 155 * 156 * The =prompt argument specifies a prompt to use if no token is cached. 157 * If it is =NULL, the =PAM_AUTHTOK_PROMPT or =PAM_OLDAUTHTOK_PROMPT item, 158 * as appropriate, will be used. If that item is also =NULL, a hardcoded 159 * default prompt will be used. 160 * 161 * If =item is set to =PAM_AUTHTOK and there is a non-null =PAM_OLDAUTHTOK 162 * item, =pam_get_authtok will ask the user to confirm the new token by 163 * retyping it. If there is a mismatch, =pam_get_authtok will return 164 * =PAM_TRY_AGAIN. 165 * 166 * >pam_get_item 167 * >pam_get_user 168 */
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