source: openpam/trunk/lib/pam_vprompt.c @ 157

Last change on this file since 157 was 157, checked in by Dag-Erling Smørgrav, 18 years ago

DBA update and minor whitespace fixes.

File size: 3.8 KB
Line 
1/*-
2 * Copyright (c) 2002 Networks Associates Technology, Inc.
3 * All rights reserved.
4 *
5 * This software was developed for the FreeBSD Project by ThinkSec AS and
6 * Network Associates Laboratories, the Security Research Division of
7 * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
8 * ("CBOSS"), as part of the DARPA CHATS research program.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote
19 *    products derived from this software without specific prior written
20 *    permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $P4: //depot/projects/openpam/lib/pam_vprompt.c#7 $
35 */
36
37#include <stdarg.h>
38#include <stdio.h>
39#include <stdlib.h>
40
41#include <security/pam_appl.h>
42#include <security/openpam.h>
43
44/*
45 * OpenPAM extension
46 *
47 * Call the conversation function
48 */
49
50int
51pam_vprompt(pam_handle_t *pamh,
52        int style,
53        char **resp,
54        const char *fmt,
55        va_list ap)
56{
57        char msgbuf[PAM_MAX_MSG_SIZE];
58        struct pam_message msg;
59        const struct pam_message *msgp;
60        struct pam_response *rsp;
61        struct pam_conv *conv;
62        int r;
63
64        r = pam_get_item(pamh, PAM_CONV, (const void **)&conv);
65        if (r != PAM_SUCCESS)
66                return (r);
67        if (conv == NULL) {
68                openpam_log(PAM_LOG_ERROR, "no conversation function");
69                return (PAM_SYSTEM_ERR);
70        }
71        vsnprintf(msgbuf, PAM_MAX_MSG_SIZE, fmt, ap);
72        msg.msg_style = style;
73        msg.msg = msgbuf;
74        msgp = &msg;
75        rsp = NULL;
76        r = (conv->conv)(1, &msgp, &rsp, conv->appdata_ptr);
77        *resp = rsp == NULL ? NULL : rsp->resp;
78        free(rsp);
79        return (r);
80}
81
82/*
83 * Error codes:
84 *
85 *     !PAM_SYMBOL_ERR
86 *      PAM_SYSTEM_ERR
87 *      PAM_BUF_ERR
88 *      PAM_CONV_ERR
89 */
90
91/**
92 * The =pam_vprompt function constructs a string from the =fmt and =ap
93 * arguments using =vsnprintf, and passes it to the given PAM context's
94 * conversation function.
95 *
96 * The =style argument specifies the type of interaction requested, and
97 * must be one of the following:
98 *
99 *      =PAM_PROMPT_ECHO_OFF:
100 *              Display the message and obtain the user's response without
101 *              displaying it.
102 *      =PAM_PROMPT_ECHO_ON:
103 *              Display the message and obtain the user's response.
104 *      =PAM_ERROR_MSG:
105 *              Display the message as an error message, and do not wait
106 *              for a response.
107 *      =PAM_TEXT_INFO:
108 *              Display the message as an informational message, and do
109 *              not wait for a response.
110 *
111 * A pointer to the response, or =NULL if the conversation function did
112 * not return one, is stored in the location pointed to by the =resp
113 * argument.
114 *
115 * The message and response should not exceed =PAM_MAX_MSG_SIZE or
116 * =PAM_MAX_RESP_SIZE, respectively.
117 * If they do, they may be truncated.
118 *
119 * >pam_error
120 * >pam_info
121 * >pam_prompt
122 * >pam_verror
123 * >pam_vinfo
124 */
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