pam_vprompt.c revision 186063
1/*- 2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 3 * Copyright (c) 2004-2007 Dag-Erling Sm��rgrav 4 * All rights reserved. 5 * 6 * This software was developed for the FreeBSD Project by ThinkSec AS and 7 * Network Associates Laboratories, the Security Research Division of 8 * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 9 * ("CBOSS"), as part of the DARPA CHATS research program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The name of the author may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * $Id: pam_vprompt.c 408 2007-12-21 11:36:24Z des $ 36 */ 37 38#include <stdarg.h> 39#include <stdio.h> 40#include <stdlib.h> 41 42#include <security/pam_appl.h> 43 44#include "openpam_impl.h" 45 46/* 47 * OpenPAM extension 48 * 49 * Call the conversation function 50 */ 51 52int 53pam_vprompt(const pam_handle_t *pamh, 54 int style, 55 char **resp, 56 const char *fmt, 57 va_list ap) 58{ 59 char msgbuf[PAM_MAX_MSG_SIZE]; 60 struct pam_message msg; 61 const struct pam_message *msgp; 62 struct pam_response *rsp; 63 const struct pam_conv *conv; 64 const void *convp; 65 int r; 66 67 ENTER(); 68 r = pam_get_item(pamh, PAM_CONV, &convp); 69 if (r != PAM_SUCCESS) 70 RETURNC(r); 71 conv = convp; 72 if (conv == NULL || conv->conv == NULL) { 73 openpam_log(PAM_LOG_ERROR, "no conversation function"); 74 RETURNC(PAM_SYSTEM_ERR); 75 } 76 vsnprintf(msgbuf, PAM_MAX_MSG_SIZE, fmt, ap); 77 msg.msg_style = style; 78 msg.msg = msgbuf; 79 msgp = &msg; 80 rsp = NULL; 81 r = (conv->conv)(1, &msgp, &rsp, conv->appdata_ptr); 82 *resp = rsp == NULL ? NULL : rsp->resp; 83 FREE(rsp); 84 RETURNC(r); 85} 86 87/* 88 * Error codes: 89 * 90 * !PAM_SYMBOL_ERR 91 * PAM_SYSTEM_ERR 92 * PAM_BUF_ERR 93 * PAM_CONV_ERR 94 */ 95 96/** 97 * The =pam_vprompt function constructs a string from the =fmt and =ap 98 * arguments using =vsnprintf, and passes it to the given PAM context's 99 * conversation function. 100 * 101 * The =style argument specifies the type of interaction requested, and 102 * must be one of the following: 103 * 104 * =PAM_PROMPT_ECHO_OFF: 105 * Display the message and obtain the user's response without 106 * displaying it. 107 * =PAM_PROMPT_ECHO_ON: 108 * Display the message and obtain the user's response. 109 * =PAM_ERROR_MSG: 110 * Display the message as an error message, and do not wait 111 * for a response. 112 * =PAM_TEXT_INFO: 113 * Display the message as an informational message, and do 114 * not wait for a response. 115 * 116 * A pointer to the response, or =NULL if the conversation function did 117 * not return one, is stored in the location pointed to by the =resp 118 * argument. 119 * 120 * The message and response should not exceed =PAM_MAX_MSG_SIZE or 121 * =PAM_MAX_RESP_SIZE, respectively. 122 * If they do, they may be truncated. 123 * 124 * >pam_error 125 * >pam_info 126 * >pam_prompt 127 * >pam_verror 128 * >pam_vinfo 129 */ 130