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
pam_vprompt(const pam_handle_t * pamh,int style,char ** resp,const char * fmt,va_list ap)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