| 1 | /*- |
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| 2 | * Copyright (c) 2002-2003 Networks Associates Technology, Inc. |
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| 3 | * Copyright (c) 2004-2011 Dag-Erling Smørgrav |
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| 4 | * All rights reserved. |
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| 5 | * |
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| 6 | * This software was developed for the FreeBSD Project by ThinkSec AS and |
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| 7 | * Network Associates Laboratories, the Security Research Division of |
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| 8 | * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 |
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| 9 | * ("CBOSS"), as part of the DARPA CHATS research program. |
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| 10 | * |
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| 11 | * Redistribution and use in source and binary forms, with or without |
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| 12 | * modification, are permitted provided that the following conditions |
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| 13 | * are met: |
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| 14 | * 1. Redistributions of source code must retain the above copyright |
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| 15 | * notice, this list of conditions and the following disclaimer. |
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| 16 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 17 | * notice, this list of conditions and the following disclaimer in the |
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| 18 | * documentation and/or other materials provided with the distribution. |
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| 19 | * 3. The name of the author may not be used to endorse or promote |
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| 20 | * products derived from this software without specific prior written |
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| 21 | * permission. |
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| 22 | * |
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| 23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| 24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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| 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 33 | * SUCH DAMAGE. |
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| 34 | * |
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| 35 | * $Id: pam_vprompt.c 437 2011-09-13 12:00:13Z des $ |
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| 36 | */ |
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| 37 | |
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| 38 | #ifdef HAVE_CONFIG_H |
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| 39 | # include "config.h" |
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| 40 | #endif |
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| 41 | |
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| 42 | #include <stdarg.h> |
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| 43 | #include <stdio.h> |
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| 44 | #include <stdlib.h> |
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| 45 | |
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| 46 | #include <security/pam_appl.h> |
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| 47 | |
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| 48 | #include "openpam_impl.h" |
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| 49 | |
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| 50 | /* |
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| 51 | * OpenPAM extension |
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| 52 | * |
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| 53 | * Call the conversation function |
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| 54 | */ |
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| 55 | |
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| 56 | int |
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| 57 | pam_vprompt(const pam_handle_t *pamh, |
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| 58 | int style, |
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| 59 | char **resp, |
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| 60 | const char *fmt, |
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| 61 | va_list ap) |
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| 62 | { |
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| 63 | char msgbuf[PAM_MAX_MSG_SIZE]; |
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| 64 | struct pam_message msg; |
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| 65 | const struct pam_message *msgp; |
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| 66 | struct pam_response *rsp; |
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| 67 | const struct pam_conv *conv; |
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| 68 | const void *convp; |
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| 69 | int r; |
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| 70 | |
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| 71 | ENTER(); |
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| 72 | r = pam_get_item(pamh, PAM_CONV, &convp); |
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| 73 | if (r != PAM_SUCCESS) |
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| 74 | RETURNC(r); |
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| 75 | conv = convp; |
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| 76 | if (conv == NULL || conv->conv == NULL) { |
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| 77 | openpam_log(PAM_LOG_ERROR, "no conversation function"); |
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| 78 | RETURNC(PAM_SYSTEM_ERR); |
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| 79 | } |
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| 80 | vsnprintf(msgbuf, PAM_MAX_MSG_SIZE, fmt, ap); |
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| 81 | msg.msg_style = style; |
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| 82 | msg.msg = msgbuf; |
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| 83 | msgp = &msg; |
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| 84 | rsp = NULL; |
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| 85 | r = (conv->conv)(1, &msgp, &rsp, conv->appdata_ptr); |
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| 86 | *resp = rsp == NULL ? NULL : rsp->resp; |
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| 87 | FREE(rsp); |
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| 88 | RETURNC(r); |
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| 89 | } |
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| 90 | |
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| 91 | /* |
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| 92 | * Error codes: |
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| 93 | * |
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| 94 | * !PAM_SYMBOL_ERR |
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| 95 | * PAM_SYSTEM_ERR |
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| 96 | * PAM_BUF_ERR |
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| 97 | * PAM_CONV_ERR |
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| 98 | */ |
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| 99 | |
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| 100 | /** |
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| 101 | * The =pam_vprompt function constructs a string from the =fmt and =ap |
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| 102 | * arguments using =vsnprintf, and passes it to the given PAM context's |
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| 103 | * conversation function. |
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| 104 | * |
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| 105 | * The =style argument specifies the type of interaction requested, and |
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| 106 | * must be one of the following: |
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| 107 | * |
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| 108 | * =PAM_PROMPT_ECHO_OFF: |
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| 109 | * Display the message and obtain the user's response without |
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| 110 | * displaying it. |
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| 111 | * =PAM_PROMPT_ECHO_ON: |
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| 112 | * Display the message and obtain the user's response. |
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| 113 | * =PAM_ERROR_MSG: |
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| 114 | * Display the message as an error message, and do not wait |
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| 115 | * for a response. |
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| 116 | * =PAM_TEXT_INFO: |
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| 117 | * Display the message as an informational message, and do |
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| 118 | * not wait for a response. |
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| 119 | * |
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| 120 | * A pointer to the response, or =NULL if the conversation function did |
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| 121 | * not return one, is stored in the location pointed to by the =resp |
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| 122 | * argument. |
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| 123 | * |
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| 124 | * The message and response should not exceed =PAM_MAX_MSG_SIZE or |
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| 125 | * =PAM_MAX_RESP_SIZE, respectively. |
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| 126 | * If they do, they may be truncated. |
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| 127 | * |
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| 128 | * >pam_error |
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| 129 | * >pam_info |
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| 130 | * >pam_prompt |
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| 131 | * >pam_verror |
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| 132 | * >pam_vinfo |
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| 133 | */ |
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