suricata
detect-ike-spi.c
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1 /* Copyright (C) 2020 Open Information Security Foundation
2  *
3  * You can copy, redistribute or modify this Program under the terms of
4  * the GNU General Public License version 2 as published by the Free
5  * Software Foundation.
6  *
7  * This program is distributed in the hope that it will be useful,
8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10  * GNU General Public License for more details.
11  *
12  * You should have received a copy of the GNU General Public License
13  * version 2 along with this program; if not, write to the Free Software
14  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
15  * 02110-1301, USA.
16  */
17 
18 /**
19  *
20  * \author Frank Honza <frank.honza@dcso.de>
21  */
22 
23 #include "suricata-common.h"
24 #include "threads.h"
25 #include "decode.h"
26 #include "detect.h"
27 
28 #include "detect-parse.h"
29 #include "detect-engine.h"
30 #include "detect-engine-mpm.h"
32 #include "detect-urilen.h"
33 
34 #include "flow.h"
35 #include "flow-var.h"
36 #include "flow-util.h"
37 
38 #include "util-debug.h"
39 #include "util-unittest.h"
40 #include "util-unittest-helper.h"
41 #include "util-spm.h"
42 
43 #include "app-layer.h"
44 #include "app-layer-parser.h"
45 
46 #include "detect-ike-spi.h"
47 #include "stream-tcp.h"
48 
49 #include "rust.h"
50 #include "app-layer-ike.h"
51 #include "rust-bindings.h"
52 
53 #define KEYWORD_NAME_INITIATOR "ike.init_spi"
54 #define KEYWORD_DOC_INITIATOR "ike-keywords.html#ike-init_spi";
55 #define BUFFER_NAME_INITIATOR "ike.init_spi"
56 #define BUFFER_DESC_INITIATOR "ike init spi"
57 
58 #define KEYWORD_NAME_RESPONDER "ike.resp_spi"
59 #define KEYWORD_DOC_RESPONDER "ike-keywords.html#ike-resp_spi";
60 #define BUFFER_NAME_RESPONDER "ike.resp_spi"
61 #define BUFFER_DESC_RESPONDER "ike resp spi"
62 
63 static int g_buffer_initiator_id = 0;
64 static int g_buffer_responder_id = 0;
65 
66 static int DetectSpiInitiatorSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
67 {
68  if (DetectBufferSetActiveList(s, g_buffer_initiator_id) < 0)
69  return -1;
70 
72  return -1;
73 
74  return 0;
75 }
76 
77 static int DetectSpiResponderSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
78 {
79  if (DetectBufferSetActiveList(s, g_buffer_responder_id) < 0)
80  return -1;
81 
83  return -1;
84 
85  return 0;
86 }
87 
88 static InspectionBuffer *GetInitiatorData(DetectEngineThreadCtx *det_ctx,
89  const DetectEngineTransforms *transforms, Flow *_f, const uint8_t _flow_flags, void *txv,
90  const int list_id)
91 {
92  InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
93  if (buffer->inspect == NULL) {
94  const uint8_t *b = NULL;
95  uint32_t b_len = 0;
96 
97  if (rs_ike_state_get_spi_initiator(txv, &b, &b_len) != 1)
98  return NULL;
99  if (b == NULL || b_len == 0)
100  return NULL;
101 
102  InspectionBufferSetup(det_ctx, list_id, buffer, b, b_len);
103  InspectionBufferApplyTransforms(buffer, transforms);
104  }
105 
106  return buffer;
107 }
108 
109 static InspectionBuffer *GetResponderData(DetectEngineThreadCtx *det_ctx,
110  const DetectEngineTransforms *transforms, Flow *_f, const uint8_t _flow_flags, void *txv,
111  const int list_id)
112 {
113  InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
114  if (buffer->inspect == NULL) {
115  const uint8_t *b = NULL;
116  uint32_t b_len = 0;
117 
118  if (rs_ike_state_get_spi_responder(txv, &b, &b_len) != 1)
119  return NULL;
120  if (b == NULL || b_len == 0)
121  return NULL;
122 
123  InspectionBufferSetup(det_ctx, list_id, buffer, b, b_len);
124  InspectionBufferApplyTransforms(buffer, transforms);
125  }
126 
127  return buffer;
128 }
129 
131 {
132  // register initiator
136  "sticky buffer to match on the IKE spi initiator";
137  sigmatch_table[DETECT_AL_IKE_SPI_INITIATOR].Setup = DetectSpiInitiatorSetup;
140 
142  DetectEngineInspectBufferGeneric, GetInitiatorData);
143 
145  PrefilterGenericMpmRegister, GetInitiatorData, ALPROTO_IKE, 1);
146 
148 
149  g_buffer_initiator_id = DetectBufferTypeGetByName(BUFFER_NAME_INITIATOR);
150  SCLogDebug("registering " BUFFER_NAME_INITIATOR " rule option");
151 
152  // register responder
156  "sticky buffer to match on the IKE spi responder";
157  sigmatch_table[DETECT_AL_IKE_SPI_RESPONDER].Setup = DetectSpiResponderSetup;
160 
162  DetectEngineInspectBufferGeneric, GetResponderData);
163 
165  PrefilterGenericMpmRegister, GetResponderData, ALPROTO_IKE, 1);
166 
168 
169  g_buffer_responder_id = DetectBufferTypeGetByName(BUFFER_NAME_RESPONDER);
170  SCLogDebug("registering " BUFFER_NAME_RESPONDER " rule option");
171 }
SigTableElmt_::url
const char * url
Definition: detect.h:1238
DetectSignatureSetAppProto
int DetectSignatureSetAppProto(Signature *s, AppProto alproto)
Definition: detect-parse.c:1493
detect-engine.h
SIGMATCH_INFO_STICKY_BUFFER
#define SIGMATCH_INFO_STICKY_BUFFER
Definition: detect.h:1444
ALPROTO_IKE
@ ALPROTO_IKE
Definition: app-layer-protos.h:49
SigTableElmt_::desc
const char * desc
Definition: detect.h:1237
DetectEngineInspectBufferGeneric
uint8_t DetectEngineInspectBufferGeneric(DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx, const DetectEngineAppInspectionEngine *engine, const Signature *s, Flow *f, uint8_t flags, void *alstate, void *txv, uint64_t tx_id)
Do the content inspection & validation for a signature.
Definition: detect-engine.c:1993
flow-util.h
BUFFER_DESC_RESPONDER
#define BUFFER_DESC_RESPONDER
Definition: detect-ike-spi.c:61
SigTableElmt_::name
const char * name
Definition: detect.h:1235
stream-tcp.h
DetectEngineTransforms
Definition: detect.h:371
SCLogDebug
#define SCLogDebug(...)
Definition: util-debug.h:296
InspectionBuffer
Definition: detect.h:337
threads.h
Flow_
Flow data structure.
Definition: flow.h:356
PrefilterGenericMpmRegister
int PrefilterGenericMpmRegister(DetectEngineCtx *de_ctx, SigGroupHead *sgh, MpmCtx *mpm_ctx, const DetectBufferMpmRegistery *mpm_reg, int list_id)
Definition: detect-engine-prefilter.c:749
SigTableElmt_::flags
uint16_t flags
Definition: detect.h:1229
DetectEngineCtx_
main detection engine ctx
Definition: detect.h:784
KEYWORD_DOC_RESPONDER
#define KEYWORD_DOC_RESPONDER
Definition: detect-ike-spi.c:59
rust.h
SIG_FLAG_TOCLIENT
#define SIG_FLAG_TOCLIENT
Definition: detect.h:229
SigTableElmt_::Setup
int(* Setup)(DetectEngineCtx *, Signature *, const char *)
Definition: detect.h:1220
detect-engine-prefilter.h
util-unittest.h
InspectionBufferGet
InspectionBuffer * InspectionBufferGet(DetectEngineThreadCtx *det_ctx, const int list_id)
Definition: detect-engine.c:1368
util-unittest-helper.h
DetectBufferTypeGetByName
int DetectBufferTypeGetByName(const char *name)
Definition: detect-engine.c:1085
SIG_FLAG_TOSERVER
#define SIG_FLAG_TOSERVER
Definition: detect.h:228
decode.h
util-debug.h
de_ctx
DetectEngineCtx * de_ctx
Definition: fuzz_siginit.c:17
app-layer-ike.h
DetectEngineThreadCtx_
Definition: detect.h:1024
detect-engine-mpm.h
detect.h
app-layer-parser.h
DetectAppLayerInspectEngineRegister2
void DetectAppLayerInspectEngineRegister2(const char *name, AppProto alproto, uint32_t dir, int progress, InspectEngineFuncPtr2 Callback2, InspectionBufferGetDataPtr GetData)
register inspect engine at start up time
Definition: detect-engine.c:227
KEYWORD_NAME_RESPONDER
#define KEYWORD_NAME_RESPONDER
Definition: detect-ike-spi.c:58
detect-ike-spi.h
BUFFER_NAME_INITIATOR
#define BUFFER_NAME_INITIATOR
Definition: detect-ike-spi.c:55
DETECT_AL_IKE_SPI_INITIATOR
@ DETECT_AL_IKE_SPI_INITIATOR
Definition: detect-engine-register.h:326
DetectAppLayerMpmRegister2
void DetectAppLayerMpmRegister2(const char *name, int direction, int priority, int(*PrefilterRegister)(DetectEngineCtx *de_ctx, SigGroupHead *sgh, MpmCtx *mpm_ctx, const DetectBufferMpmRegistery *mpm_reg, int list_id), InspectionBufferGetDataPtr GetData, AppProto alproto, int tx_min_progress)
register a MPM engine
Definition: detect-engine-mpm.c:89
suricata-common.h
BUFFER_DESC_INITIATOR
#define BUFFER_DESC_INITIATOR
Definition: detect-ike-spi.c:56
InspectionBufferApplyTransforms
void InspectionBufferApplyTransforms(InspectionBuffer *buffer, const DetectEngineTransforms *transforms)
Definition: detect-engine.c:1551
sigmatch_table
SigTableElmt sigmatch_table[DETECT_TBLSIZE]
Definition: detect-parse.c:76
util-spm.h
DetectIkeSpiRegister
void DetectIkeSpiRegister(void)
Definition: detect-ike-spi.c:130
KEYWORD_NAME_INITIATOR
#define KEYWORD_NAME_INITIATOR
Definition: detect-ike-spi.c:53
InspectionBuffer::inspect
const uint8_t * inspect
Definition: detect.h:338
str
#define str(s)
Definition: suricata-common.h:280
BUFFER_NAME_RESPONDER
#define BUFFER_NAME_RESPONDER
Definition: detect-ike-spi.c:60
InspectionBufferSetup
void InspectionBufferSetup(DetectEngineThreadCtx *det_ctx, const int list_id, InspectionBuffer *buffer, const uint8_t *data, const uint32_t data_len)
setup the buffer with our initial data
Definition: detect-engine.c:1449
detect-parse.h
Signature_
Signature container.
Definition: detect.h:539
detect-urilen.h
SIGMATCH_NOOPT
#define SIGMATCH_NOOPT
Definition: detect.h:1420
DetectBufferSetActiveList
int DetectBufferSetActiveList(Signature *s, const int list)
Definition: detect-engine.c:1299
KEYWORD_DOC_INITIATOR
#define KEYWORD_DOC_INITIATOR
Definition: detect-ike-spi.c:54
DetectBufferTypeSetDescriptionByName
void DetectBufferTypeSetDescriptionByName(const char *name, const char *desc)
Definition: detect-engine.c:1182
DETECT_AL_IKE_SPI_RESPONDER
@ DETECT_AL_IKE_SPI_RESPONDER
Definition: detect-engine-register.h:327
flow.h
flow-var.h
app-layer.h