Add a libpttls providing NEA PT-TLS / TNC IF-T for TLS transport layer
This commit is contained in:
Martin Willi
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/*
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* Copyright (C) 2012 Martin Willi
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* Copyright (C) 2012 revosec AG
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "pt_tls_server.h"
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#include "pt_tls.h"
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#include <utils/debug.h>
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#include <tnc/tnc.h>
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typedef struct private_pt_tls_server_t private_pt_tls_server_t;
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/**
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* Private data of an pt_tls_server_t object.
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*/
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struct private_pt_tls_server_t {
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/**
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* Public pt_tls_server_t interface.
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*/
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pt_tls_server_t public;
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/**
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* TLS protected socket
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*/
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tls_socket_t *tls;
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enum {
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/* expecting version negotiation */
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PT_TLS_SERVER_VERSION,
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/* expecting an SASL exchange */
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PT_TLS_SERVER_AUTH,
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/* expecting TNCCS exchange */
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PT_TLS_SERVER_TNCCS,
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/* terminating state */
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PT_TLS_SERVER_END,
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} state;
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/**
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* Message Identifier
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*/
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u_int32_t identifier;
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/**
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* TNCCS protocol handler, implemented as tls_t
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*/
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tls_t *tnccs;
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};
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/**
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* Negotiate PT-TLS version
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*/
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static bool negotiate_version(private_pt_tls_server_t *this)
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{
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bio_reader_t *reader;
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bio_writer_t *writer;
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u_int32_t vendor, type, identifier;
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u_int8_t reserved, vmin, vmax, vpref;
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reader = pt_tls_read(this->tls, &vendor, &type, &identifier);
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if (!reader)
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{
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return FALSE;
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}
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if (vendor != 0 || type != PT_TLS_VERSION_REQUEST ||
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!reader->read_uint8(reader, &reserved) ||
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!reader->read_uint8(reader, &vmin) ||
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!reader->read_uint8(reader, &vmax) ||
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!reader->read_uint8(reader, &vpref))
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{
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DBG1(DBG_TNC, "PT-TLS version negotiation failed");
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reader->destroy(reader);
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return FALSE;
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}
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reader->destroy(reader);
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if (vmin > PT_TLS_VERSION || vmax < PT_TLS_VERSION)
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{
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/* TODO: send error */
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return FALSE;
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}
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writer = bio_writer_create(4);
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writer->write_uint24(writer, 0);
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writer->write_uint8(writer, PT_TLS_VERSION);
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return pt_tls_write(this->tls, writer, PT_TLS_VERSION_RESPONSE,
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this->identifier++);
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}
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/**
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* Authenticated PT-TLS session with SASL
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*/
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static bool authenticate(private_pt_tls_server_t *this)
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{
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bio_writer_t *writer;
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/* send empty SASL mechanims list to skip authentication */
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writer = bio_writer_create(0);
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return pt_tls_write(this->tls, writer, PT_TLS_SASL_MECHS,
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this->identifier++);
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}
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/**
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* Perform assessment
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*/
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static bool assess(private_pt_tls_server_t *this, tls_t *tnccs)
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{
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while (TRUE)
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{
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bio_writer_t *writer;
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bio_reader_t *reader;
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u_int32_t vendor, type, identifier;
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chunk_t data;
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writer = bio_writer_create(32);
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while (TRUE)
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{
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char buf[2048];
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size_t buflen, msglen;
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buflen = sizeof(buf);
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switch (tnccs->build(tnccs, buf, &buflen, &msglen))
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{
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case SUCCESS:
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writer->destroy(writer);
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return tnccs->is_complete(tnccs);
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case FAILED:
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default:
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writer->destroy(writer);
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return FALSE;
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case INVALID_STATE:
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writer->destroy(writer);
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break;
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case NEED_MORE:
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writer->write_data(writer, chunk_create(buf, buflen));
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continue;
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case ALREADY_DONE:
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writer->write_data(writer, chunk_create(buf, buflen));
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if (!pt_tls_write(this->tls, writer, PT_TLS_PB_TNC_BATCH,
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this->identifier++))
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{
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return FALSE;
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}
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writer = bio_writer_create(32);
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continue;
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}
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break;
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}
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reader = pt_tls_read(this->tls, &vendor, &type, &identifier);
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if (!reader)
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{
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return FALSE;
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}
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if (vendor == 0)
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{
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if (type == PT_TLS_ERROR)
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{
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DBG1(DBG_TNC, "received PT-TLS error");
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reader->destroy(reader);
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return FALSE;
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}
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if (type != PT_TLS_PB_TNC_BATCH)
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{
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DBG1(DBG_TNC, "unexpected PT-TLS message: %d", type);
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reader->destroy(reader);
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return FALSE;
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}
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data = reader->peek(reader);
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switch (tnccs->process(tnccs, data.ptr, data.len))
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{
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case SUCCESS:
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reader->destroy(reader);
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return tnccs->is_complete(tnccs);
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case FAILED:
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default:
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reader->destroy(reader);
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return FALSE;
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case NEED_MORE:
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break;
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}
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}
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else
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{
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DBG1(DBG_TNC, "ignoring vendor specific PT-TLS message");
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}
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reader->destroy(reader);
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}
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}
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METHOD(pt_tls_server_t, handle, status_t,
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private_pt_tls_server_t *this)
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{
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switch (this->state)
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{
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case PT_TLS_SERVER_VERSION:
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if (!negotiate_version(this))
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{
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return FAILED;
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}
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DBG1(DBG_TNC, "negotiated PT-TLS version %d", PT_TLS_VERSION);
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this->state = PT_TLS_SERVER_AUTH;
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break;
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case PT_TLS_SERVER_AUTH:
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DBG1(DBG_TNC, "sending empty mechanism list to skip SASL");
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if (!authenticate(this))
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{
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return FAILED;
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}
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this->state = PT_TLS_SERVER_TNCCS;
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this->tnccs = (tls_t*)tnc->tnccs->create_instance(tnc->tnccs,
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TNCCS_2_0, TRUE);
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if (!this->tnccs)
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{
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return FAILED;
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}
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break;
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case PT_TLS_SERVER_TNCCS:
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if (!assess(this, (tls_t*)this->tnccs))
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{
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return FAILED;
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}
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this->state = PT_TLS_SERVER_END;
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return SUCCESS;
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default:
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return FAILED;
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}
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return NEED_MORE;
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}
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METHOD(pt_tls_server_t, get_fd, int,
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private_pt_tls_server_t *this)
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{
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return this->tls->get_fd(this->tls);
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}
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METHOD(pt_tls_server_t, destroy, void,
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private_pt_tls_server_t *this)
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{
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DESTROY_IF(this->tnccs);
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this->tls->destroy(this->tls);
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free(this);
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}
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/**
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* See header
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*/
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pt_tls_server_t *pt_tls_server_create(identification_t *server, int fd)
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{
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private_pt_tls_server_t *this;
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INIT(this,
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.public = {
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.handle = _handle,
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.get_fd = _get_fd,
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.destroy = _destroy,
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},
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.state = PT_TLS_SERVER_VERSION,
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.tls = tls_socket_create(TRUE, server, NULL, fd, NULL),
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);
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if (!this->tls)
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{
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free(this);
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return NULL;
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}
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return &this->public;
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}
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