suricata
detect-sip-uri.c
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1 /* Copyright (C) 2019 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 Giuseppe Longo <giuseppe@glongo.it>
21  *
22  * Implements the sip.uri sticky buffer
23  *
24  */
25 
26 #include "suricata-common.h"
27 #include "threads.h"
28 #include "debug.h"
29 #include "decode.h"
30 #include "detect.h"
31 
32 #include "detect-parse.h"
33 #include "detect-engine.h"
34 #include "detect-engine-mpm.h"
36 #include "detect-content.h"
37 #include "detect-pcre.h"
38 #include "detect-urilen.h"
39 
40 #include "flow.h"
41 #include "flow-var.h"
42 #include "flow-util.h"
43 
44 #include "util-debug.h"
45 #include "util-unittest.h"
46 #include "util-unittest-helper.h"
47 #include "util-spm.h"
48 
49 #include "app-layer.h"
50 #include "app-layer-parser.h"
51 
52 #include "detect-sip-uri.h"
53 #include "stream-tcp.h"
54 
55 #include "rust.h"
56 #include "app-layer-sip.h"
57 #include "rust-sip-detect-gen.h"
58 
59 #define KEYWORD_NAME "sip.uri"
60 #define KEYWORD_DOC "sip-keywords.html#sip-uri"
61 #define BUFFER_NAME "sip.uri"
62 #define BUFFER_DESC "sip request uri"
63 static int g_buffer_id = 0;
64 
65 static bool DetectSipUriValidateCallback(const Signature *s, const char **sigerror)
66 {
67  return DetectUrilenValidateContent(s, g_buffer_id, sigerror);
68 }
69 
70 static void DetectSipUriSetupCallback(const DetectEngineCtx *de_ctx,
71  Signature *s)
72 {
73  SCLogDebug("callback invoked by %u", s->id);
74  DetectUrilenApplyToContent(s, g_buffer_id);
75 }
76 
77 static int DetectSipUriSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
78 {
79  if (DetectBufferSetActiveList(s, g_buffer_id) < 0)
80  return -1;
81 
83  return -1;
84 
85  return 0;
86 }
87 
88 static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
89  const DetectEngineTransforms *transforms, Flow *_f,
90  const uint8_t _flow_flags, void *txv, 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_sip_tx_get_uri(txv, &b, &b_len) != 1)
98  return NULL;
99  if (b == NULL || b_len == 0)
100  return NULL;
101 
102  InspectionBufferSetup(buffer, b, b_len);
103  InspectionBufferApplyTransforms(buffer, transforms);
104  }
105 
106  return buffer;
107 }
108 
110 {
112  sigmatch_table[DETECT_AL_SIP_URI].desc = "sticky buffer to match on the SIP URI";
114  sigmatch_table[DETECT_AL_SIP_URI].Setup = DetectSipUriSetup;
116 
120 
123  1);
124 
126 
128  DetectSipUriSetupCallback);
129 
131  DetectSipUriValidateCallback);
132 
133  g_buffer_id = DetectBufferTypeGetByName(BUFFER_NAME);
134 
135  SCLogDebug("registering " BUFFER_NAME " rule option");
136 }
SigTableElmt sigmatch_table[DETECT_TBLSIZE]
Definition: detect.h:1448
int(* Setup)(DetectEngineCtx *, Signature *, const char *)
Definition: detect.h:1186
#define SCLogDebug(...)
Definition: util-debug.h:335
int DetectSignatureSetAppProto(Signature *s, AppProto alproto)
#define BUFFER_DESC
#define BUFFER_NAME
uint32_t id
Definition: detect.h:555
void DetectSipUriRegister(void)
#define KEYWORD_NAME
void DetectBufferTypeRegisterSetupCallback(const char *name, void(*SetupCallback)(const DetectEngineCtx *, Signature *))
InspectionBuffer * InspectionBufferGet(DetectEngineThreadCtx *det_ctx, const int list_id)
const char * name
Definition: detect.h:1200
Signature container.
Definition: detect.h:522
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
main detection engine ctx
Definition: detect.h:761
void DetectUrilenApplyToContent(Signature *s, int list)
set prefilter dsize pair
int DetectBufferTypeGetByName(const char *name)
#define str(s)
#define SIG_FLAG_TOSERVER
Definition: detect.h:236
void DetectAppLayerInspectEngineRegister2(const char *name, AppProto alproto, uint32_t dir, int progress, InspectEngineFuncPtr2 Callback2, InspectionBufferGetDataPtr GetData)
register inspect engine at start up time
int 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.
const char * desc
Definition: detect.h:1202
int PrefilterGenericMpmRegister(DetectEngineCtx *de_ctx, SigGroupHead *sgh, MpmCtx *mpm_ctx, const DetectBufferMpmRegistery *mpm_reg, int list_id)
void InspectionBufferSetup(InspectionBuffer *buffer, const uint8_t *data, const uint32_t data_len)
setup the buffer with our initial data
#define KEYWORD_DOC
void InspectionBufferApplyTransforms(InspectionBuffer *buffer, const DetectEngineTransforms *transforms)
#define SIGMATCH_NOOPT
Definition: detect.h:1369
bool DetectUrilenValidateContent(const Signature *s, int list, const char **sigerror)
const char * url
Definition: detect.h:1203
int DetectBufferSetActiveList(Signature *s, const int list)
const uint8_t * inspect
Definition: detect.h:343
#define DOC_URL
Definition: suricata.h:86
void DetectBufferTypeSetDescriptionByName(const char *name, const char *desc)
void DetectBufferTypeRegisterValidateCallback(const char *name, _Bool(*ValidateCallback)(const Signature *, const char **sigerror))
#define DOC_VERSION
Definition: suricata.h:91
uint16_t flags
Definition: detect.h:1194
Flow data structure.
Definition: flow.h:325