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215 lines
6.3 KiB
C
215 lines
6.3 KiB
C
/* Copyright (C) 2007-2012 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* \file
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*
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* \author Anoop Saldanha <anoopsaldanha@gmail.com>
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* \author Pierre Chifflier <pierre.chifflier@ssi.gouv.fr>
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*
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*/
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#ifndef __APP_LAYER_SSL_H__
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#define __APP_LAYER_SSL_H__
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#include "app-layer-protos.h"
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#include "app-layer-parser.h"
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#include "decode-events.h"
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#include "queue.h"
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enum {
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/* TLS protocol messages */
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TLS_DECODER_EVENT_INVALID_SSLV2_HEADER,
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TLS_DECODER_EVENT_INVALID_TLS_HEADER,
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TLS_DECODER_EVENT_INVALID_RECORD_VERSION,
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TLS_DECODER_EVENT_INVALID_RECORD_TYPE,
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TLS_DECODER_EVENT_INVALID_HANDSHAKE_MESSAGE,
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TLS_DECODER_EVENT_HEARTBEAT,
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TLS_DECODER_EVENT_INVALID_HEARTBEAT,
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TLS_DECODER_EVENT_OVERFLOW_HEARTBEAT,
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TLS_DECODER_EVENT_DATALEAK_HEARTBEAT_MISMATCH,
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TLS_DECODER_EVENT_HANDSHAKE_INVALID_LENGTH,
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TLS_DECODER_EVENT_MULTIPLE_SNI_EXTENSIONS,
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TLS_DECODER_EVENT_INVALID_SNI_TYPE,
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TLS_DECODER_EVENT_INVALID_SNI_LENGTH,
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TLS_DECODER_EVENT_TOO_MANY_RECORDS_IN_PACKET,
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/* Certificates decoding messages */
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TLS_DECODER_EVENT_INVALID_CERTIFICATE,
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TLS_DECODER_EVENT_CERTIFICATE_MISSING_ELEMENT,
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TLS_DECODER_EVENT_CERTIFICATE_UNKNOWN_ELEMENT,
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TLS_DECODER_EVENT_CERTIFICATE_INVALID_LENGTH,
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TLS_DECODER_EVENT_CERTIFICATE_INVALID_STRING,
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TLS_DECODER_EVENT_ERROR_MSG_ENCOUNTERED,
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TLS_DECODER_EVENT_INVALID_SSL_RECORD,
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};
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enum {
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TLS_STATE_IN_PROGRESS = 0,
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TLS_STATE_CERT_READY = 1,
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TLS_HANDSHAKE_DONE = 2,
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TLS_STATE_FINISHED = 3
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};
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/* Flag to indicate that server will now on send encrypted msgs */
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#define SSL_AL_FLAG_SERVER_CHANGE_CIPHER_SPEC 0x0001
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/* Flag to indicate that client will now on send encrypted msgs */
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#define SSL_AL_FLAG_CLIENT_CHANGE_CIPHER_SPEC 0x0002
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#define SSL_AL_FLAG_CHANGE_CIPHER_SPEC 0x0004
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/* SSL related flags */
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#define SSL_AL_FLAG_SSL_CLIENT_HS 0x0008
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#define SSL_AL_FLAG_SSL_SERVER_HS 0x0010
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#define SSL_AL_FLAG_SSL_CLIENT_MASTER_KEY 0x0020
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#define SSL_AL_FLAG_SSL_CLIENT_SSN_ENCRYPTED 0x0040
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#define SSL_AL_FLAG_SSL_SERVER_SSN_ENCRYPTED 0x0080
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#define SSL_AL_FLAG_SSL_NO_SESSION_ID 0x0100
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/* flags specific to detect-ssl-state keyword */
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#define SSL_AL_FLAG_STATE_CLIENT_HELLO 0x0200
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#define SSL_AL_FLAG_STATE_SERVER_HELLO 0x0400
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#define SSL_AL_FLAG_STATE_CLIENT_KEYX 0x0800
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#define SSL_AL_FLAG_STATE_SERVER_KEYX 0x1000
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#define SSL_AL_FLAG_STATE_UNKNOWN 0x2000
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/* flag to indicate that session is finished */
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#define SSL_AL_FLAG_STATE_FINISHED 0x4000
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/* flags specific to HeartBeat state */
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#define SSL_AL_FLAG_HB_INFLIGHT 0x8000
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#define SSL_AL_FLAG_HB_CLIENT_INIT 0x10000
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#define SSL_AL_FLAG_HB_SERVER_INIT 0x20000
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/* flag to indicate that handshake is done */
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#define SSL_AL_FLAG_HANDSHAKE_DONE 0x80000
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/* A session ID in the Client Hello message, indicating the client
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wants to resume a session */
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#define SSL_AL_FLAG_SSL_CLIENT_SESSION_ID 0x100000
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/* Session resumed without a full handshake */
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#define SSL_AL_FLAG_SESSION_RESUMED 0x200000
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/* config flags */
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#define SSL_TLS_LOG_PEM (1 << 0)
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/* extensions */
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#define SSL_EXTENSION_SNI 0x0000
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/* SNI types */
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#define SSL_SNI_TYPE_HOST_NAME 0
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/* SSL versions. We'll use a unified format for all, with the top byte
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* holding the major version and the lower byte the minor version */
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enum {
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TLS_VERSION_UNKNOWN = 0x0000,
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SSL_VERSION_2 = 0x0200,
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SSL_VERSION_3 = 0x0300,
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TLS_VERSION_10 = 0x0301,
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TLS_VERSION_11 = 0x0302,
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TLS_VERSION_12 = 0x0303,
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};
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typedef struct SSLCertsChain_ {
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uint8_t *cert_data;
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uint32_t cert_len;
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TAILQ_ENTRY(SSLCertsChain_) next;
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} SSLCertsChain;
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typedef struct SSLStateConnp_ {
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/* record length */
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uint32_t record_length;
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/* record length's length for SSLv2 */
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uint32_t record_lengths_length;
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/* offset of the beginning of the current message (including header) */
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uint32_t message_start;
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uint32_t message_length;
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uint16_t version;
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uint8_t content_type;
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uint8_t handshake_type;
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uint32_t handshake_length;
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/* the no of bytes processed in the currently parsed record */
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uint16_t bytes_processed;
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/* the no of bytes processed in the currently parsed handshake */
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uint16_t hs_bytes_processed;
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/* sslv2 client hello session id length */
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uint16_t session_id_length;
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char *cert0_subject;
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char *cert0_issuerdn;
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char *cert0_serial;
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time_t cert0_not_before;
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time_t cert0_not_after;
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char *cert0_fingerprint;
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/* ssl server name indication extension */
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char *sni;
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uint8_t *cert_input;
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uint32_t cert_input_len;
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TAILQ_HEAD(, SSLCertsChain_) certs;
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uint32_t cert_log_flag;
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/* buffer for the tls record.
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* We use a malloced buffer, if the record is fragmented */
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uint8_t *trec;
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uint32_t trec_len;
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uint32_t trec_pos;
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} SSLStateConnp;
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/**
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* \brief SSLv[2.0|3.[0|1|2|3]] state structure.
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*
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* Structure to store the SSL state values.
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*/
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typedef struct SSLState_ {
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Flow *f;
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/* holds some state flags we need */
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uint32_t flags;
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/* specifies which loggers are done logging */
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uint32_t logged;
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/* there might be a better place to store this*/
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uint16_t hb_record_len;
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uint16_t events;
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uint32_t current_flags;
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SSLStateConnp *curr_connp;
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SSLStateConnp client_connp;
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SSLStateConnp server_connp;
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DetectEngineState *de_state;
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AppLayerDecoderEvents *decoder_events;
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} SSLState;
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void RegisterSSLParsers(void);
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void SSLParserRegisterTests(void);
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void SSLSetEvent(SSLState *ssl_state, uint8_t event);
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#endif /* __APP_LAYER_SSL_H__ */
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