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