1 /* $NetBSD: pam_vprompt.c,v 1.3 2017/05/06 19:50:10 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 5 * Copyright (c) 2004-2011 Dag-Erling Smørgrav 6 * All rights reserved. 7 * 8 * This software was developed for the FreeBSD Project by ThinkSec AS and 9 * Network Associates Laboratories, the Security Research Division of 10 * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 11 * ("CBOSS"), as part of the DARPA CHATS research program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. The name of the author may not be used to endorse or promote 22 * products derived from this software without specific prior written 23 * permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * $OpenPAM: pam_vprompt.c 938 2017-04-30 21:34:42Z des $ 38 */ 39 40 #ifdef HAVE_CONFIG_H 41 # include "config.h" 42 #endif 43 44 #include <sys/cdefs.h> 45 __RCSID("$NetBSD: pam_vprompt.c,v 1.3 2017/05/06 19:50:10 christos Exp $"); 46 47 #include <stdarg.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 51 #include <security/pam_appl.h> 52 53 #include "openpam_impl.h" 54 55 /* 56 * OpenPAM extension 57 * 58 * Call the conversation function 59 */ 60 61 int 62 pam_vprompt(const pam_handle_t *pamh, 63 int style, 64 char **resp, 65 const char *fmt, 66 va_list ap) 67 { 68 char msgbuf[PAM_MAX_MSG_SIZE]; 69 struct pam_message msg; 70 const struct pam_message *msgp; 71 struct pam_response *rsp; 72 const struct pam_conv *conv; 73 const void *convp; 74 int r; 75 76 ENTER(); 77 r = pam_get_item(pamh, PAM_CONV, &convp); 78 if (r != PAM_SUCCESS) 79 RETURNC(r); 80 conv = convp; 81 if (conv == NULL || conv->conv == NULL) { 82 openpam_log(PAM_LOG_ERROR, "no conversation function"); 83 RETURNC(PAM_SYSTEM_ERR); 84 } 85 vsnprintf(msgbuf, (size_t)PAM_MAX_MSG_SIZE, fmt, ap); 86 msg.msg_style = style; 87 msg.msg = msgbuf; 88 msgp = &msg; 89 rsp = NULL; 90 r = (conv->conv)(1, &msgp, &rsp, conv->appdata_ptr); 91 *resp = rsp == NULL ? NULL : rsp->resp; 92 FREE(rsp); 93 RETURNC(r); 94 } 95 96 /* 97 * Error codes: 98 * 99 * !PAM_SYMBOL_ERR 100 * PAM_SYSTEM_ERR 101 * PAM_BUF_ERR 102 * PAM_CONV_ERR 103 */ 104 105 /** 106 * The =pam_vprompt function constructs a string from the =fmt and =ap 107 * arguments using =vsnprintf, and passes it to the given PAM context's 108 * conversation function. 109 * 110 * The =style argument specifies the type of interaction requested, and 111 * must be one of the following: 112 * 113 * =PAM_PROMPT_ECHO_OFF: 114 * Display the message and obtain the user's response without 115 * displaying it. 116 * =PAM_PROMPT_ECHO_ON: 117 * Display the message and obtain the user's response. 118 * =PAM_ERROR_MSG: 119 * Display the message as an error message, and do not wait 120 * for a response. 121 * =PAM_TEXT_INFO: 122 * Display the message as an informational message, and do 123 * not wait for a response. 124 * 125 * A pointer to the response, or =NULL if the conversation function did 126 * not return one, is stored in the location pointed to by the =resp 127 * argument. 128 * 129 * The message and response should not exceed =PAM_MAX_MSG_SIZE or 130 * =PAM_MAX_RESP_SIZE, respectively. 131 * If they do, they may be truncated. 132 * 133 * >pam_error 134 * >pam_info 135 * >pam_prompt 136 * >pam_verror 137 * >pam_vinfo 138 */ 139