1 /*- 2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 3 * Copyright (c) 2004-2011 Dag-Erling Smørgrav 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 * $OpenPAM: pam_vprompt.c 938 2017-04-30 21:34:42Z des $ 36 */ 37 38 #ifdef HAVE_CONFIG_H 39 # include "config.h" 40 #endif 41 42 #include <stdarg.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 46 #include <security/pam_appl.h> 47 48 #include "openpam_impl.h" 49 50 /* 51 * OpenPAM extension 52 * 53 * Call the conversation function 54 */ 55 56 int 57 pam_vprompt(const pam_handle_t *pamh, 58 int style, 59 char **resp, 60 const char *fmt, 61 va_list ap) 62 { 63 char msgbuf[PAM_MAX_MSG_SIZE]; 64 struct pam_message msg; 65 const struct pam_message *msgp; 66 struct pam_response *rsp; 67 const struct pam_conv *conv; 68 const void *convp; 69 int r; 70 71 ENTER(); 72 r = pam_get_item(pamh, PAM_CONV, &convp); 73 if (r != PAM_SUCCESS) 74 RETURNC(r); 75 conv = convp; 76 if (conv == NULL || conv->conv == NULL) { 77 openpam_log(PAM_LOG_ERROR, "no conversation function"); 78 RETURNC(PAM_SYSTEM_ERR); 79 } 80 vsnprintf(msgbuf, PAM_MAX_MSG_SIZE, fmt, ap); 81 msg.msg_style = style; 82 msg.msg = msgbuf; 83 msgp = &msg; 84 rsp = NULL; 85 r = (conv->conv)(1, &msgp, &rsp, conv->appdata_ptr); 86 *resp = rsp == NULL ? NULL : rsp->resp; 87 FREE(rsp); 88 RETURNC(r); 89 } 90 91 /* 92 * Error codes: 93 * 94 * !PAM_SYMBOL_ERR 95 * PAM_SYSTEM_ERR 96 * PAM_BUF_ERR 97 * PAM_CONV_ERR 98 */ 99 100 /** 101 * The =pam_vprompt function constructs a string from the =fmt and =ap 102 * arguments using =vsnprintf, and passes it to the given PAM context's 103 * conversation function. 104 * 105 * The =style argument specifies the type of interaction requested, and 106 * must be one of the following: 107 * 108 * =PAM_PROMPT_ECHO_OFF: 109 * Display the message and obtain the user's response without 110 * displaying it. 111 * =PAM_PROMPT_ECHO_ON: 112 * Display the message and obtain the user's response. 113 * =PAM_ERROR_MSG: 114 * Display the message as an error message, and do not wait 115 * for a response. 116 * =PAM_TEXT_INFO: 117 * Display the message as an informational message, and do 118 * not wait for a response. 119 * 120 * A pointer to the response, or =NULL if the conversation function did 121 * not return one, is stored in the location pointed to by the =resp 122 * argument. 123 * 124 * The message and response should not exceed =PAM_MAX_MSG_SIZE or 125 * =PAM_MAX_RESP_SIZE, respectively. 126 * If they do, they may be truncated. 127 * 128 * >pam_error 129 * >pam_info 130 * >pam_prompt 131 * >pam_verror 132 * >pam_vinfo 133 */ 134