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-rw-r--r--src/libpttls/pt_tls_server.c277
1 files changed, 277 insertions, 0 deletions
diff --git a/src/libpttls/pt_tls_server.c b/src/libpttls/pt_tls_server.c
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index 000000000..b525acb6f
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+++ b/src/libpttls/pt_tls_server.c
@@ -0,0 +1,277 @@
+/*
+ * 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_server.h"
+#include "pt_tls.h"
+
+#include <utils/debug.h>
+
+typedef struct private_pt_tls_server_t private_pt_tls_server_t;
+
+/**
+ * Private data of an pt_tls_server_t object.
+ */
+struct private_pt_tls_server_t {
+
+ /**
+ * Public pt_tls_server_t interface.
+ */
+ pt_tls_server_t public;
+
+ /**
+ * TLS protected socket
+ */
+ tls_socket_t *tls;
+
+ enum {
+ /* expecting version negotiation */
+ PT_TLS_SERVER_VERSION,
+ /* expecting an SASL exchange */
+ PT_TLS_SERVER_AUTH,
+ /* expecting TNCCS exchange */
+ PT_TLS_SERVER_TNCCS,
+ /* terminating state */
+ PT_TLS_SERVER_END,
+ } state;
+
+ /**
+ * Message Identifier
+ */
+ u_int32_t identifier;
+
+ /**
+ * TNCCS protocol handler, implemented as tls_t
+ */
+ tls_t *tnccs;
+};
+
+/**
+ * Negotiate PT-TLS version
+ */
+static bool negotiate_version(private_pt_tls_server_t *this)
+{
+ bio_reader_t *reader;
+ bio_writer_t *writer;
+ u_int32_t vendor, type, identifier;
+ u_int8_t reserved, vmin, vmax, vpref;
+
+ reader = pt_tls_read(this->tls, &vendor, &type, &identifier);
+ if (!reader)
+ {
+ return FALSE;
+ }
+ if (vendor != 0 || type != PT_TLS_VERSION_REQUEST ||
+ !reader->read_uint8(reader, &reserved) ||
+ !reader->read_uint8(reader, &vmin) ||
+ !reader->read_uint8(reader, &vmax) ||
+ !reader->read_uint8(reader, &vpref))
+ {
+ DBG1(DBG_TNC, "PT-TLS version negotiation failed");
+ reader->destroy(reader);
+ return FALSE;
+ }
+ reader->destroy(reader);
+
+ if (vmin > PT_TLS_VERSION || vmax < PT_TLS_VERSION)
+ {
+ /* TODO: send error */
+ return FALSE;
+ }
+
+ writer = bio_writer_create(4);
+ writer->write_uint24(writer, 0);
+ writer->write_uint8(writer, PT_TLS_VERSION);
+
+ return pt_tls_write(this->tls, writer, PT_TLS_VERSION_RESPONSE,
+ this->identifier++);
+}
+
+/**
+ * Authenticated PT-TLS session with SASL
+ */
+static bool authenticate(private_pt_tls_server_t *this)
+{
+ bio_writer_t *writer;
+
+ /* send empty SASL mechanims list to skip authentication */
+ writer = bio_writer_create(0);
+ return pt_tls_write(this->tls, writer, PT_TLS_SASL_MECHS,
+ this->identifier++);
+}
+
+/**
+ * Perform assessment
+ */
+static bool assess(private_pt_tls_server_t *this, tls_t *tnccs)
+{
+ while (TRUE)
+ {
+ bio_writer_t *writer;
+ bio_reader_t *reader;
+ u_int32_t vendor, type, identifier;
+ chunk_t data;
+
+ writer = bio_writer_create(32);
+ while (TRUE)
+ {
+ char buf[2048];
+ size_t buflen, msglen;
+
+ buflen = sizeof(buf);
+ switch (tnccs->build(tnccs, buf, &buflen, &msglen))
+ {
+ case SUCCESS:
+ writer->destroy(writer);
+ return tnccs->is_complete(tnccs);
+ case FAILED:
+ default:
+ writer->destroy(writer);
+ return FALSE;
+ case INVALID_STATE:
+ writer->destroy(writer);
+ break;
+ case NEED_MORE:
+ writer->write_data(writer, chunk_create(buf, buflen));
+ continue;
+ case ALREADY_DONE:
+ writer->write_data(writer, chunk_create(buf, buflen));
+ if (!pt_tls_write(this->tls, writer, PT_TLS_PB_TNC_BATCH,
+ this->identifier++))
+ {
+ return FALSE;
+ }
+ writer = bio_writer_create(32);
+ continue;
+ }
+ break;
+ }
+
+ reader = pt_tls_read(this->tls, &vendor, &type, &identifier);
+ if (!reader)
+ {
+ return FALSE;
+ }
+ if (vendor == 0)
+ {
+ if (type == PT_TLS_ERROR)
+ {
+ DBG1(DBG_TNC, "received PT-TLS error");
+ reader->destroy(reader);
+ return FALSE;
+ }
+ if (type != PT_TLS_PB_TNC_BATCH)
+ {
+ DBG1(DBG_TNC, "unexpected PT-TLS message: %d", type);
+ reader->destroy(reader);
+ return FALSE;
+ }
+ data = reader->peek(reader);
+ switch (tnccs->process(tnccs, data.ptr, data.len))
+ {
+ case SUCCESS:
+ reader->destroy(reader);
+ return tnccs->is_complete(tnccs);
+ case FAILED:
+ default:
+ reader->destroy(reader);
+ return FALSE;
+ case NEED_MORE:
+ break;
+ }
+ }
+ else
+ {
+ DBG1(DBG_TNC, "ignoring vendor specific PT-TLS message");
+ }
+ reader->destroy(reader);
+ }
+}
+
+METHOD(pt_tls_server_t, handle, status_t,
+ private_pt_tls_server_t *this)
+{
+ switch (this->state)
+ {
+ case PT_TLS_SERVER_VERSION:
+ if (!negotiate_version(this))
+ {
+ return FAILED;
+ }
+ DBG1(DBG_TNC, "negotiated PT-TLS version %d", PT_TLS_VERSION);
+ this->state = PT_TLS_SERVER_AUTH;
+ break;
+ case PT_TLS_SERVER_AUTH:
+ DBG1(DBG_TNC, "sending empty mechanism list to skip SASL");
+ if (!authenticate(this))
+ {
+ return FAILED;
+ }
+ this->state = PT_TLS_SERVER_TNCCS;
+ break;
+ case PT_TLS_SERVER_TNCCS:
+ if (!assess(this, (tls_t*)this->tnccs))
+ {
+ return FAILED;
+ }
+ this->state = PT_TLS_SERVER_END;
+ return SUCCESS;
+ default:
+ return FAILED;
+ }
+ return NEED_MORE;
+}
+
+METHOD(pt_tls_server_t, get_fd, int,
+ private_pt_tls_server_t *this)
+{
+ return this->tls->get_fd(this->tls);
+}
+
+METHOD(pt_tls_server_t, destroy, void,
+ private_pt_tls_server_t *this)
+{
+ this->tnccs->destroy(this->tnccs);
+ this->tls->destroy(this->tls);
+ free(this);
+}
+
+/**
+ * See header
+ */
+pt_tls_server_t *pt_tls_server_create(identification_t *server, int fd,
+ tnccs_t *tnccs)
+{
+ private_pt_tls_server_t *this;
+
+ INIT(this,
+ .public = {
+ .handle = _handle,
+ .get_fd = _get_fd,
+ .destroy = _destroy,
+ },
+ .state = PT_TLS_SERVER_VERSION,
+ .tls = tls_socket_create(TRUE, server, NULL, fd, NULL),
+ .tnccs = (tls_t*)tnccs,
+ );
+
+ if (!this->tls)
+ {
+ this->tnccs->destroy(this->tnccs);
+ free(this);
+ return NULL;
+ }
+
+ return &this->public;
+}