1 /* $NetBSD: pam_vprompt.c,v 1.4 2023/06/30 21:46:21 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 38 #ifdef HAVE_CONFIG_H 39 # include "config.h" 40 #endif 41 42 #include <sys/cdefs.h> 43 __RCSID("$NetBSD: pam_vprompt.c,v 1.4 2023/06/30 21:46:21 christos Exp $"); 44 45 #include <stdarg.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 49 #include <security/pam_appl.h> 50 51 #include "openpam_impl.h" 52 53 /* 54 * OpenPAM extension 55 * 56 * Call the conversation function 57 */ 58 59 int 60 pam_vprompt(const pam_handle_t *pamh, 61 int style, 62 char **resp, 63 const char *fmt, 64 va_list ap) 65 { 66 char msgbuf[PAM_MAX_MSG_SIZE]; 67 struct pam_message msg; 68 const struct pam_message *msgp; 69 struct pam_response *rsp; 70 const struct pam_conv *conv; 71 const void *convp; 72 int r; 73 74 ENTER(); 75 r = pam_get_item(pamh, PAM_CONV, &convp); 76 if (r != PAM_SUCCESS) 77 RETURNC(r); 78 conv = convp; 79 if (conv == NULL || conv->conv == NULL) { 80 openpam_log(PAM_LOG_ERROR, "no conversation function"); 81 RETURNC(PAM_SYSTEM_ERR); 82 } 83 vsnprintf(msgbuf, (size_t)PAM_MAX_MSG_SIZE, fmt, ap); 84 msg.msg_style = style; 85 msg.msg = msgbuf; 86 msgp = &msg; 87 rsp = NULL; 88 r = (conv->conv)(1, &msgp, &rsp, conv->appdata_ptr); 89 *resp = rsp == NULL ? NULL : rsp->resp; 90 FREE(rsp); 91 RETURNC(r); 92 } 93 94 /* 95 * Error codes: 96 * 97 * !PAM_SYMBOL_ERR 98 * PAM_SYSTEM_ERR 99 * PAM_BUF_ERR 100 * PAM_CONV_ERR 101 */ 102 103 /** 104 * The =pam_vprompt function constructs a string from the =fmt and =ap 105 * arguments using =vsnprintf, and passes it to the given PAM context's 106 * conversation function. 107 * 108 * The =style argument specifies the type of interaction requested, and 109 * must be one of the following: 110 * 111 * =PAM_PROMPT_ECHO_OFF: 112 * Display the message and obtain the user's response without 113 * displaying it. 114 * =PAM_PROMPT_ECHO_ON: 115 * Display the message and obtain the user's response. 116 * =PAM_ERROR_MSG: 117 * Display the message as an error message, and do not wait 118 * for a response. 119 * =PAM_TEXT_INFO: 120 * Display the message as an informational message, and do 121 * not wait for a response. 122 * 123 * A pointer to the response, or =NULL if the conversation function did 124 * not return one, is stored in the location pointed to by the =resp 125 * argument. 126 * 127 * The message and response should not exceed =PAM_MAX_MSG_SIZE or 128 * =PAM_MAX_RESP_SIZE, respectively. 129 * If they do, they may be truncated. 130 * 131 * >pam_error 132 * >pam_info 133 * >pam_prompt 134 * >pam_verror 135 * >pam_vinfo 136 */ 137