suricata
detect-http-server-body.c
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/* Copyright (C) 2007-2023 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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* \ingroup httplayer
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*
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* @{
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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 Victor Julien <victor@inliniac.net>
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*
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* Implements support for the http_server_body keyword
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*/
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#include "
suricata-common.h
"
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#include "
threads.h
"
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#include "
decode.h
"
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#include "
detect.h
"
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#include "
detect-parse.h
"
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#include "
detect-engine.h
"
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#include "
detect-engine-content-inspection.h
"
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#include "
detect-content.h
"
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#include "
flow.h
"
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#include "
flow-util.h
"
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#include "
util-unittest.h
"
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#include "
util-unittest-helper.h
"
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#include "
util-profiling.h
"
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#include "
app-layer.h
"
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#include "
app-layer-parser.h
"
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#include "
app-layer-htp.h
"
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#include "
detect-http-server-body.h
"
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#include "
stream-tcp.h
"
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static
int
DetectHttpServerBodySetup(
DetectEngineCtx
*,
Signature
*,
const
char
*);
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static
int
DetectHttpServerBodySetupSticky(
DetectEngineCtx
*
de_ctx
,
Signature
*s,
const
char
*
str
);
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#ifdef UNITTESTS
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static
void
DetectHttpServerBodyRegisterTests
(
void
);
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#endif
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static
int
g_buffer_id = 0;
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/**
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* \brief Registers the keyword handlers for the "http_server_body" keyword.
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*/
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void
DetectHttpServerBodyRegister
(
void
)
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{
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/* http_server_body content modifier */
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sigmatch_table
[
DETECT_AL_HTTP_SERVER_BODY
].
name
=
"http_server_body"
;
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sigmatch_table
[
DETECT_AL_HTTP_SERVER_BODY
].
desc
=
"content modifier to match on the HTTP response-body"
;
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sigmatch_table
[
DETECT_AL_HTTP_SERVER_BODY
].
url
=
"/rules/http-keywords.html#http-server-body"
;
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sigmatch_table
[
DETECT_AL_HTTP_SERVER_BODY
].
Setup
= DetectHttpServerBodySetup;
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#ifdef UNITTESTS
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sigmatch_table
[
DETECT_AL_HTTP_SERVER_BODY
].
RegisterTests
=
DetectHttpServerBodyRegisterTests
;
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#endif
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sigmatch_table
[
DETECT_AL_HTTP_SERVER_BODY
].
flags
|=
SIGMATCH_NOOPT
;
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sigmatch_table
[
DETECT_AL_HTTP_SERVER_BODY
].
flags
|=
SIGMATCH_INFO_CONTENT_MODIFIER
;
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sigmatch_table
[
DETECT_AL_HTTP_SERVER_BODY
].
alternative
=
DETECT_HTTP_RESPONSE_BODY
;
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/* http.request_body sticky buffer */
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sigmatch_table
[
DETECT_HTTP_RESPONSE_BODY
].
name
=
"http.response_body"
;
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sigmatch_table
[
DETECT_HTTP_RESPONSE_BODY
].
desc
=
"sticky buffer to match the HTTP response body buffer"
;
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sigmatch_table
[
DETECT_HTTP_RESPONSE_BODY
].
url
=
"/rules/http-keywords.html#http-server-body"
;
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sigmatch_table
[
DETECT_HTTP_RESPONSE_BODY
].
Setup
= DetectHttpServerBodySetupSticky;
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sigmatch_table
[
DETECT_HTTP_RESPONSE_BODY
].
flags
|=
SIGMATCH_NOOPT
;
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sigmatch_table
[
DETECT_HTTP_RESPONSE_BODY
].
flags
|=
SIGMATCH_INFO_STICKY_BUFFER
;
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g_buffer_id =
DetectBufferTypeRegister
(
"file_data"
);
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}
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/**
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* \brief The setup function for the http_server_body keyword for a signature.
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*
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* \param de_ctx Pointer to the detection engine context.
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* \param s Pointer to signature for the current Signature being parsed
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* from the rules.
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* \param m Pointer to the head of the SigMatchs for the current rule
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* being parsed.
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* \param arg Pointer to the string holding the keyword value.
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*
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* \retval 0 On success
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* \retval -1 On failure
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*/
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int
DetectHttpServerBodySetup(
DetectEngineCtx
*
de_ctx
,
Signature
*s,
const
char
*arg)
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{
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return
DetectEngineContentModifierBufferSetup
(
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de_ctx
, s, arg,
DETECT_AL_HTTP_SERVER_BODY
, g_buffer_id,
ALPROTO_HTTP1
);
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}
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/**
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* \brief this function setup the http.response_body keyword used in the rule
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*
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* \param de_ctx Pointer to the Detection Engine Context
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* \param s Pointer to the Signature to which the current keyword belongs
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* \param str Should hold an empty string always
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*
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* \retval 0 On success
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*/
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static
int
DetectHttpServerBodySetupSticky(
DetectEngineCtx
*
de_ctx
,
Signature
*s,
const
char
*
str
)
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{
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if
(
DetectBufferSetActiveList
(
de_ctx
, s, g_buffer_id) < 0)
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return
-1;
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if
(
DetectSignatureSetAppProto
(s,
ALPROTO_HTTP
) < 0)
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return
-1;
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// file data is on both directions, but we only take the one to client here
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s->
flags
|=
SIG_FLAG_TOCLIENT
;
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s->
flags
&= ~
SIG_FLAG_TOSERVER
;
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return
0;
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}
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/************************************Unittests*********************************/
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#ifdef UNITTESTS
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#include "
tests/detect-http-server-body.c
"
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#endif
/* UNITTESTS */
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/**
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* @}
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*/
SigTableElmt_::url
const char * url
Definition:
detect.h:1307
DetectSignatureSetAppProto
int DetectSignatureSetAppProto(Signature *s, AppProto alproto)
Definition:
detect-parse.c:1737
detect-content.h
detect-engine.h
SIGMATCH_INFO_STICKY_BUFFER
#define SIGMATCH_INFO_STICKY_BUFFER
Definition:
detect.h:1512
SigTableElmt_::desc
const char * desc
Definition:
detect.h:1306
sigmatch_table
SigTableElmt * sigmatch_table
Definition:
detect-parse.c:127
flow-util.h
SIGMATCH_INFO_CONTENT_MODIFIER
#define SIGMATCH_INFO_CONTENT_MODIFIER
Definition:
detect.h:1510
SigTableElmt_::name
const char * name
Definition:
detect.h:1304
stream-tcp.h
DetectHttpServerBodyRegister
void DetectHttpServerBodyRegister(void)
Registers the keyword handlers for the "http_server_body" keyword.
Definition:
detect-http-server-body.c:68
DetectBufferSetActiveList
int DetectBufferSetActiveList(DetectEngineCtx *de_ctx, Signature *s, const int list)
Definition:
detect-engine.c:1354
threads.h
SigTableElmt_::flags
uint16_t flags
Definition:
detect.h:1298
DetectEngineCtx_
main detection engine ctx
Definition:
detect.h:841
SIG_FLAG_TOCLIENT
#define SIG_FLAG_TOCLIENT
Definition:
detect.h:268
SigTableElmt_::Setup
int(* Setup)(DetectEngineCtx *, Signature *, const char *)
Definition:
detect.h:1289
util-unittest.h
util-unittest-helper.h
SIG_FLAG_TOSERVER
#define SIG_FLAG_TOSERVER
Definition:
detect.h:267
app-layer-htp.h
decode.h
de_ctx
DetectEngineCtx * de_ctx
Definition:
fuzz_siginit.c:17
detect.h
SigTableElmt_::alternative
uint16_t alternative
Definition:
detect.h:1302
app-layer-parser.h
util-profiling.h
Signature_::flags
uint32_t flags
Definition:
detect.h:602
DetectEngineContentModifierBufferSetup
int DetectEngineContentModifierBufferSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg, int sm_type, int sm_list, AppProto alproto)
Definition:
detect-parse.c:194
DETECT_HTTP_RESPONSE_BODY
@ DETECT_HTTP_RESPONSE_BODY
Definition:
detect-engine-register.h:155
detect-engine-content-inspection.h
detect-http-server-body.h
DetectBufferTypeRegister
int DetectBufferTypeRegister(const char *name)
Definition:
detect-engine.c:1027
suricata-common.h
ALPROTO_HTTP1
@ ALPROTO_HTTP1
Definition:
app-layer-protos.h:30
str
#define str(s)
Definition:
suricata-common.h:291
detect-http-server-body.c
detect-parse.h
Signature_
Signature container.
Definition:
detect.h:601
ALPROTO_HTTP
@ ALPROTO_HTTP
Definition:
app-layer-protos.h:70
DETECT_AL_HTTP_SERVER_BODY
@ DETECT_AL_HTTP_SERVER_BODY
Definition:
detect-engine-register.h:154
SIGMATCH_NOOPT
#define SIGMATCH_NOOPT
Definition:
detect.h:1488
flow.h
DetectHttpServerBodyRegisterTests
void DetectHttpServerBodyRegisterTests(void)
Definition:
detect-http-server-body.c:3097
SigTableElmt_::RegisterTests
void(* RegisterTests)(void)
Definition:
detect.h:1296
app-layer.h
src
detect-http-server-body.c
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