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/* Copyright (C) Xaver Loppenstedt <xaver@loppenstedt.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms,
* with or without modification, are permitted provided
* that the following conditions are met:
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* Neither the name of the copyright holder nor the names
* of any other contributors may be used to endorse or
* promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "libssh2_priv.h"
#include "userauth_kbd_packet.h"
int userauth_keyboard_interactive_decode_info_request(LIBSSH2_SESSION *session)
{
unsigned char *language_tag;
size_t language_tag_len;
unsigned int i;
unsigned char packet_type;
uint32_t tmp_u32;
struct string_buf decoded;
decoded.data = session->userauth_kybd_data;
decoded.dataptr = session->userauth_kybd_data;
decoded.len = session->userauth_kybd_data_len;
if(session->userauth_kybd_data_len < 17) {
_libssh2_error(session, LIBSSH2_ERROR_BUFFER_TOO_SMALL,
"userauth keyboard data buffer too small "
"to get length");
return -1;
}
/* byte SSH_MSG_USERAUTH_INFO_REQUEST */
_libssh2_get_byte(&decoded, &packet_type);
/* string name (ISO-10646 UTF-8) */
if(_libssh2_copy_string(session, &decoded,
&session->userauth_kybd_auth_name,
&session->userauth_kybd_auth_name_len) == -1) {
_libssh2_error(session, LIBSSH2_ERROR_ALLOC,
"Unable to decode "
"keyboard-interactive 'name' "
"request field");
return -1;
}
/* string instruction (ISO-10646 UTF-8) */
if(_libssh2_copy_string(session, &decoded,
&session->userauth_kybd_auth_instruction,
&session->userauth_kybd_auth_instruction_len)
== -1) {
_libssh2_error(session, LIBSSH2_ERROR_ALLOC,
"Unable to decode "
"keyboard-interactive 'instruction' "
"request field");
return -1;
}
/* string language tag (as defined in [RFC-3066]) */
if(_libssh2_get_string(&decoded, &language_tag,
&language_tag_len) == -1) {
_libssh2_error(session, LIBSSH2_ERROR_ALLOC,
"Unable to decode "
"keyboard-interactive 'language tag' "
"request field");
return -1;
}
/* int num-prompts */
if(_libssh2_get_u32(&decoded, &tmp_u32) == -1 ||
(session->userauth_kybd_num_prompts = tmp_u32) != tmp_u32) {
_libssh2_error(session, LIBSSH2_ERROR_BUFFER_TOO_SMALL,
"Unable to decode "
"keyboard-interactive number of keyboard prompts");
return -1;
}
if(session->userauth_kybd_num_prompts > 100) {
_libssh2_error(session, LIBSSH2_ERROR_OUT_OF_BOUNDARY,
"Too many replies for "
"keyboard-interactive prompts");
return -1;
}
if(session->userauth_kybd_num_prompts == 0) {
return 0;
}
session->userauth_kybd_prompts =
LIBSSH2_CALLOC(session,
sizeof(LIBSSH2_USERAUTH_KBDINT_PROMPT) *
session->userauth_kybd_num_prompts);
if(!session->userauth_kybd_prompts) {
_libssh2_error(session, LIBSSH2_ERROR_ALLOC,
"Unable to allocate memory for "
"keyboard-interactive prompts array");
return -1;
}
session->userauth_kybd_responses =
LIBSSH2_CALLOC(session,
sizeof(LIBSSH2_USERAUTH_KBDINT_RESPONSE) *
session->userauth_kybd_num_prompts);
if(!session->userauth_kybd_responses) {
_libssh2_error(session, LIBSSH2_ERROR_ALLOC,
"Unable to allocate memory for "
"keyboard-interactive responses array");
return -1;
}
for(i = 0; i < session->userauth_kybd_num_prompts; i++) {
/* string prompt[1] (ISO-10646 UTF-8) */
if(_libssh2_copy_string(session, &decoded,
&session->userauth_kybd_prompts[i].text,
&session->userauth_kybd_prompts[i].length)
== -1) {
_libssh2_error(session, LIBSSH2_ERROR_ALLOC,
"Unable to decode "
"keyboard-interactive prompt message");
return -1;
}
/* boolean echo[1] */
if(_libssh2_get_boolean(&decoded,
&session->userauth_kybd_prompts[i].echo)
== -1) {
_libssh2_error(session, LIBSSH2_ERROR_BUFFER_TOO_SMALL,
"Unable to decode "
"user auth keyboard prompt echo");
return -1;
}
}
return 0;
}
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