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/*
* Copyright (C) 2012 Martin Willi
* Copyright (C) 2012 revosec AG
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "pt_tls.h"
#include <utils/debug.h>
#include <pen/pen.h>
/**
* Described in header.
*/
void libpttls_init(void)
{
/* empty */
}
/*
* PT-TNC Message format:
* 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Reserved | Message Type Vendor ID |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Message Type |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Message Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Message Identifier |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Message Value (e.g. PB-TNC Batch) . . . |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
ENUM(pt_tls_message_type_names, PT_TLS_EXPERIMENTAL, PT_TLS_ERROR,
"Experimental",
"Version Request",
"Version Response",
"SASL Mechanisms",
"SASL Mechanism Selection",
"SASL Authentication Data",
"SASL Result",
"PB-TNC Batch",
"PT-TLS Error"
);
ENUM(pt_tls_sasl_result_names, PT_TLS_SASL_RESULT_SUCCESS,
PT_TLS_SASL_RESULT_MECH_FAILURE,
"Success",
"Failure",
"Abort",
"Mechanism Failure"
);
/**
* Read a chunk of data from TLS, returning a reader for it
*/
static bio_reader_t* read_tls(tls_socket_t *tls, size_t len)
{
ssize_t got, total = 0;
char *buf;
buf = malloc(len);
while (total < len)
{
got = tls->read(tls, buf + total, len - total, TRUE);
if (got <= 0)
{
free(buf);
return NULL;
}
total += got;
}
return bio_reader_create_own(chunk_create(buf, len));
}
/**
* Read a PT-TLS message, return header data
*/
bio_reader_t* pt_tls_read(tls_socket_t *tls, u_int32_t *vendor,
u_int32_t *type, u_int32_t *identifier)
{
bio_reader_t *reader;
u_int32_t len;
u_int8_t reserved;
reader = read_tls(tls, PT_TLS_HEADER_LEN);
if (!reader)
{
return NULL;
}
if (!reader->read_uint8(reader, &reserved) ||
!reader->read_uint24(reader, vendor) ||
!reader->read_uint32(reader, type) ||
!reader->read_uint32(reader, &len) ||
!reader->read_uint32(reader, identifier))
{
reader->destroy(reader);
return NULL;
}
reader->destroy(reader);
if (len < PT_TLS_HEADER_LEN)
{
DBG1(DBG_TNC, "received short PT-TLS header (%d bytes)", len);
return NULL;
}
if (*vendor == PEN_IETF)
{
DBG2(DBG_TNC, "received PT-TLS message #%d of type '%N' (%d bytes)",
*identifier, pt_tls_message_type_names, *type, len);
}
else
{
DBG2(DBG_TNC, "received PT-TLS message #%d of unknown type "
"0x%06x/0x%08x (%d bytes)",
*identifier, *vendor, *type, len);
}
return read_tls(tls, len - PT_TLS_HEADER_LEN);
}
/**
* Prepend a PT-TLS header to a writer, send data, destroy writer
*/
bool pt_tls_write(tls_socket_t *tls, pt_tls_message_type_t type,
u_int32_t identifier, chunk_t data)
{
bio_writer_t *writer;
chunk_t out;
ssize_t len;
len = PT_TLS_HEADER_LEN + data.len;
writer = bio_writer_create(len);
/* write PT-TLS header */
writer->write_uint8 (writer, 0);
writer->write_uint24(writer, 0);
writer->write_uint32(writer, type);
writer->write_uint32(writer, len);
writer->write_uint32(writer, identifier);
/* write PT-TLS body */
writer->write_data(writer, data);
DBG2(DBG_TNC, "sending PT-TLS message #%d of type '%N' (%d bytes)",
identifier, pt_tls_message_type_names, type, len);
out = writer->get_buf(writer);
len = tls->write(tls, out.ptr, out.len);
writer->destroy(writer);
return len == out.len;
}
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