suricata
detect-http-stat-code.c
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1 /* Copyright (C) 2007-2018 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  * \ingroup httplayer
20  *
21  * @{
22  */
23 
24 
25 /**
26  * \file
27  *
28  * \author Gurvinder Singh <gurvindersinghdahiya@gmail.com>
29  * \author Anoop Saldanha <anoopsaldanha@gmail.com>
30  *
31  * Implements the http_stat_code keyword
32  */
33 
34 #include "suricata-common.h"
35 #include "threads.h"
36 #include "debug.h"
37 #include "decode.h"
38 #include "detect.h"
39 
40 #include "detect-parse.h"
41 #include "detect-engine.h"
42 #include "detect-content.h"
43 #include "detect-pcre.h"
44 #include "detect-engine-mpm.h"
46 
47 #include "flow.h"
48 #include "flow-var.h"
49 #include "flow-util.h"
50 
51 #include "util-debug.h"
52 #include "util-error.h"
53 #include "util-unittest.h"
54 #include "util-unittest-helper.h"
55 #include "util-spm.h"
56 #include "util-print.h"
57 
58 #include "app-layer.h"
59 #include "app-layer-parser.h"
60 
61 #include "app-layer-htp.h"
62 #include "detect-http-stat-code.h"
63 #include "stream-tcp-private.h"
64 #include "stream-tcp.h"
65 
66 static int DetectHttpStatCodeSetup(DetectEngineCtx *, Signature *, const char *);
67 static int DetectHttpStatCodeSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str);
68 #ifdef UNITTESTS
69 static void DetectHttpStatCodeRegisterTests(void);
70 #endif
71 static int g_http_stat_code_buffer_id = 0;
72 static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
73  const DetectEngineTransforms *transforms, Flow *_f,
74  const uint8_t _flow_flags, void *txv, const int list_id);
75 
76 /**
77  * \brief Registration function for keyword: http_stat_code
78  */
80 {
81  /* http_stat_code content modifier */
82  sigmatch_table[DETECT_AL_HTTP_STAT_CODE].name = "http_stat_code";
83  sigmatch_table[DETECT_AL_HTTP_STAT_CODE].desc = "content modifier to match only on HTTP stat-code-buffer";
84  sigmatch_table[DETECT_AL_HTTP_STAT_CODE].url = "/rules/http-keywords.html#http-stat-code";
85  sigmatch_table[DETECT_AL_HTTP_STAT_CODE].Setup = DetectHttpStatCodeSetup;
86 #ifdef UNITTESTS
88 #endif
91 
92  /* http.stat_code content modifier */
93  sigmatch_table[DETECT_HTTP_STAT_CODE].name = "http.stat_code";
94  sigmatch_table[DETECT_HTTP_STAT_CODE].desc = "sticky buffer to match only on HTTP stat-code-buffer";
95  sigmatch_table[DETECT_HTTP_STAT_CODE].url = "/rules/http-keywords.html#http-stat-code";
96  sigmatch_table[DETECT_HTTP_STAT_CODE].Setup = DetectHttpStatCodeSetupSticky;
98 
100  HTP_RESPONSE_LINE, DetectEngineInspectBufferGeneric, GetData);
101 
103  GetData, ALPROTO_HTTP1, HTP_RESPONSE_LINE);
104 
105  DetectBufferTypeSetDescriptionByName("http_stat_code",
106  "http response status code");
107 
108  g_http_stat_code_buffer_id = DetectBufferTypeGetByName("http_stat_code");
109 }
110 
111 /**
112  * \brief this function setups the http_stat_code modifier keyword used in the rule
113  *
114  * \param de_ctx Pointer to the Detection Engine Context
115  * \param s Pointer to the Signature to which the current keyword belongs
116  * \param str Should hold an empty string always
117  *
118  * \retval 0 On success
119  * \retval -1 On failure
120  */
121 
122 static int DetectHttpStatCodeSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg)
123 {
125  de_ctx, s, arg, DETECT_AL_HTTP_STAT_CODE, g_http_stat_code_buffer_id, ALPROTO_HTTP1);
126 }
127 
128 /**
129  * \brief this function setup the http.stat_code keyword used in the rule
130  *
131  * \param de_ctx Pointer to the Detection Engine Context
132  * \param s Pointer to the Signature to which the current keyword belongs
133  * \param str Should hold an empty string always
134  *
135  * \retval 0 On success
136  */
137 static int DetectHttpStatCodeSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str)
138 {
139  if (DetectBufferSetActiveList(s, g_http_stat_code_buffer_id) < 0)
140  return -1;
142  return -1;
143  return 0;
144 }
145 
146 static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
147  const DetectEngineTransforms *transforms, Flow *_f,
148  const uint8_t _flow_flags, void *txv, const int list_id)
149 {
150  SCEnter();
151 
152  InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
153  if (buffer->inspect == NULL) {
154  htp_tx_t *tx = (htp_tx_t *)txv;
155 
156  if (tx->response_status == NULL)
157  return NULL;
158 
159  const uint32_t data_len = bstr_len(tx->response_status);
160  const uint8_t *data = bstr_ptr(tx->response_status);
161 
162  InspectionBufferSetup(det_ctx, list_id, buffer, data, data_len);
163  InspectionBufferApplyTransforms(buffer, transforms);
164  }
165 
166  return buffer;
167 }
168 
169 #ifdef UNITTESTS
171 #endif /* UNITTESTS */
172 
173 /**
174  * @}
175  */
SigTableElmt_::url
const char * url
Definition: detect.h:1203
DetectSignatureSetAppProto
int DetectSignatureSetAppProto(Signature *s, AppProto alproto)
Definition: detect-parse.c:1487
detect-content.h
detect-engine.h
SIGMATCH_INFO_STICKY_BUFFER
#define SIGMATCH_INFO_STICKY_BUFFER
Definition: detect.h:1393
detect-http-stat-code.c
SigTableElmt_::desc
const char * desc
Definition: detect.h:1202
flow-util.h
SIGMATCH_INFO_CONTENT_MODIFIER
#define SIGMATCH_INFO_CONTENT_MODIFIER
Definition: detect.h:1391
SigTableElmt_::name
const char * name
Definition: detect.h:1200
DetectHttpStatCodeRegisterTests
void DetectHttpStatCodeRegisterTests(void)
Register the UNITTESTS for the http_stat_code keyword.
Definition: detect-http-stat-code.c:2495
stream-tcp.h
DetectEngineTransforms
Definition: detect.h:376
InspectionBuffer
Definition: detect.h:344
threads.h
Flow_
Flow data structure.
Definition: flow.h:347
PrefilterGenericMpmRegister
int PrefilterGenericMpmRegister(DetectEngineCtx *de_ctx, SigGroupHead *sgh, MpmCtx *mpm_ctx, const DetectBufferMpmRegistery *mpm_reg, int list_id)
Definition: detect-engine-prefilter.c:611
SigTableElmt_::flags
uint16_t flags
Definition: detect.h:1194
DetectEngineCtx_
main detection engine ctx
Definition: detect.h:755
SIG_FLAG_TOCLIENT
#define SIG_FLAG_TOCLIENT
Definition: detect.h:237
SigTableElmt_::Setup
int(* Setup)(DetectEngineCtx *, Signature *, const char *)
Definition: detect.h:1185
detect-pcre.h
detect-engine-prefilter.h
util-unittest.h
InspectionBufferGet
InspectionBuffer * InspectionBufferGet(DetectEngineThreadCtx *det_ctx, const int list_id)
Definition: detect-engine.c:1006
util-unittest-helper.h
DetectBufferTypeGetByName
int DetectBufferTypeGetByName(const char *name)
Definition: detect-engine.c:825
app-layer-htp.h
decode.h
util-debug.h
util-error.h
de_ctx
DetectEngineCtx * de_ctx
Definition: fuzz_siginit.c:17
DetectEngineThreadCtx_
Definition: detect.h:999
util-print.h
SCEnter
#define SCEnter(...)
Definition: util-debug.h:300
detect-engine-mpm.h
detect.h
SigTableElmt_::alternative
uint16_t alternative
Definition: detect.h:1198
app-layer-parser.h
DetectEngineInspectBufferGeneric
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.
Definition: detect-engine.c:1588
DetectEngineContentModifierBufferSetup
int DetectEngineContentModifierBufferSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg, int sm_type, int sm_list, AppProto alproto)
Definition: detect-parse.c:146
stream-tcp-private.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:172
detect-http-stat-code.h
DETECT_HTTP_STAT_CODE
@ DETECT_HTTP_STAT_CODE
Definition: detect-engine-register.h:150
DETECT_AL_HTTP_STAT_CODE
@ DETECT_AL_HTTP_STAT_CODE
Definition: detect-engine-register.h:149
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
DetectHttpStatCodeRegister
void DetectHttpStatCodeRegister(void)
Registration function for keyword: http_stat_code.
Definition: detect-http-stat-code.c:79
suricata-common.h
InspectionBufferApplyTransforms
void InspectionBufferApplyTransforms(InspectionBuffer *buffer, const DetectEngineTransforms *transforms)
Definition: detect-engine.c:1159
ALPROTO_HTTP1
@ ALPROTO_HTTP1
Definition: app-layer-protos.h:30
sigmatch_table
SigTableElmt sigmatch_table[DETECT_TBLSIZE]
Definition: detect-parse.c:73
util-spm.h
InspectionBuffer::inspect
const uint8_t * inspect
Definition: detect.h:345
str
#define str(s)
Definition: suricata-common.h:268
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:1061
detect-parse.h
Signature_
Signature container.
Definition: detect.h:515
SIGMATCH_NOOPT
#define SIGMATCH_NOOPT
Definition: detect.h:1369
DetectBufferSetActiveList
int DetectBufferSetActiveList(Signature *s, const int list)
Definition: detect-engine.c:937
DetectBufferTypeSetDescriptionByName
void DetectBufferTypeSetDescriptionByName(const char *name, const char *desc)
Definition: detect-engine.c:853
flow.h
flow-var.h
debug.h
SigTableElmt_::RegisterTests
void(* RegisterTests)(void)
Definition: detect.h:1192
app-layer.h