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Diffstat (limited to 'src/detect-http-uri.c')
| -rw-r--r-- | src/detect-http-uri.c | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/src/detect-http-uri.c b/src/detect-http-uri.c new file mode 100644 index 0000000..cc43023 --- /dev/null +++ b/src/detect-http-uri.c @@ -0,0 +1,343 @@ +/* Copyright (C) 2007-2018 Open Information Security Foundation + * + * You can copy, redistribute or modify this Program under the terms of + * the GNU General Public License version 2 as published by the Free + * Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * version 2 along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +/** + * \ingroup httplayer + * + * @{ + */ + + +/** + * \file + * + * \author Gerardo Iglesias <iglesiasg@gmail.com> + * \author Victor Julien <victor@inliniac.net> + */ + +#include "suricata-common.h" +#include "threads.h" +#include "decode.h" +#include "detect.h" + +#include "detect-parse.h" +#include "detect-engine.h" +#include "detect-engine-mpm.h" +#include "detect-engine-prefilter.h" +#include "detect-content.h" +#include "detect-pcre.h" +#include "detect-urilen.h" + +#include "flow.h" +#include "flow-var.h" + +#include "util-debug.h" +#include "util-unittest.h" +#include "util-spm.h" +#include "util-print.h" + +#include "app-layer.h" + +#include "app-layer-htp.h" +#include "detect-http-uri.h" +#include "stream-tcp.h" + +#ifdef UNITTESTS +static void DetectHttpUriRegisterTests(void); +#endif +static void DetectHttpUriSetupCallback(const DetectEngineCtx *de_ctx, + Signature *s); +static bool DetectHttpUriValidateCallback(const Signature *s, const char **sigerror); +static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx, + const DetectEngineTransforms *transforms, + Flow *_f, const uint8_t _flow_flags, + void *txv, const int list_id); +static InspectionBuffer *GetData2(DetectEngineThreadCtx *det_ctx, + const DetectEngineTransforms *transforms, Flow *_f, const uint8_t _flow_flags, void *txv, + const int list_id); +static int DetectHttpUriSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str); +static int DetectHttpRawUriSetup(DetectEngineCtx *, Signature *, const char *); +static void DetectHttpRawUriSetupCallback(const DetectEngineCtx *de_ctx, + Signature *s); +static bool DetectHttpRawUriValidateCallback(const Signature *s, const char **); +static InspectionBuffer *GetRawData(DetectEngineThreadCtx *det_ctx, + const DetectEngineTransforms *transforms, + Flow *_f, const uint8_t _flow_flags, + void *txv, const int list_id); +static int DetectHttpRawUriSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str); + +static int g_http_raw_uri_buffer_id = 0; +static int g_http_uri_buffer_id = 0; + +/** + * \brief Registration function for keywords: http_uri and http.uri + */ +void DetectHttpUriRegister (void) +{ + /* http_uri content modifier */ + sigmatch_table[DETECT_AL_HTTP_URI].name = "http_uri"; + sigmatch_table[DETECT_AL_HTTP_URI].desc = "content modifier to match specifically and only on the HTTP uri-buffer"; + sigmatch_table[DETECT_AL_HTTP_URI].url = "/rules/http-keywords.html#http-uri-and-http-uri-raw"; + sigmatch_table[DETECT_AL_HTTP_URI].Setup = DetectHttpUriSetup; +#ifdef UNITTESTS + sigmatch_table[DETECT_AL_HTTP_URI].RegisterTests = DetectHttpUriRegisterTests; +#endif + sigmatch_table[DETECT_AL_HTTP_URI].flags |= SIGMATCH_NOOPT|SIGMATCH_INFO_CONTENT_MODIFIER; + sigmatch_table[DETECT_AL_HTTP_URI].alternative = DETECT_HTTP_URI; + + /* http.uri sticky buffer */ + sigmatch_table[DETECT_HTTP_URI].name = "http.uri"; + sigmatch_table[DETECT_HTTP_URI].alias = "http.uri.normalized"; + sigmatch_table[DETECT_HTTP_URI].desc = "sticky buffer to match specifically and only on the normalized HTTP URI buffer"; + sigmatch_table[DETECT_HTTP_URI].url = "/rules/http-keywords.html#http-uri-and-http-uri-raw"; + sigmatch_table[DETECT_HTTP_URI].Setup = DetectHttpUriSetupSticky; + sigmatch_table[DETECT_HTTP_URI].flags |= SIGMATCH_NOOPT|SIGMATCH_INFO_STICKY_BUFFER; + + DetectAppLayerInspectEngineRegister2("http_uri", ALPROTO_HTTP1, SIG_FLAG_TOSERVER, + HTP_REQUEST_LINE, DetectEngineInspectBufferGeneric, GetData); + + DetectAppLayerMpmRegister2("http_uri", SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister, + GetData, ALPROTO_HTTP1, HTP_REQUEST_LINE); + + DetectAppLayerInspectEngineRegister2("http_uri", ALPROTO_HTTP2, SIG_FLAG_TOSERVER, + HTTP2StateDataClient, DetectEngineInspectBufferGeneric, GetData2); + + DetectAppLayerMpmRegister2("http_uri", SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister, + GetData2, ALPROTO_HTTP2, HTTP2StateDataClient); + + DetectBufferTypeSetDescriptionByName("http_uri", + "http request uri"); + + DetectBufferTypeRegisterSetupCallback("http_uri", + DetectHttpUriSetupCallback); + + DetectBufferTypeRegisterValidateCallback("http_uri", + DetectHttpUriValidateCallback); + + g_http_uri_buffer_id = DetectBufferTypeGetByName("http_uri"); + + /* http_raw_uri content modifier */ + sigmatch_table[DETECT_AL_HTTP_RAW_URI].name = "http_raw_uri"; + sigmatch_table[DETECT_AL_HTTP_RAW_URI].desc = "content modifier to match on the raw HTTP uri"; + sigmatch_table[DETECT_AL_HTTP_RAW_URI].url = "/rules/http-keywords.html#http_uri-and-http_raw-uri"; + sigmatch_table[DETECT_AL_HTTP_RAW_URI].Setup = DetectHttpRawUriSetup; + sigmatch_table[DETECT_AL_HTTP_RAW_URI].flags |= SIGMATCH_NOOPT|SIGMATCH_INFO_CONTENT_MODIFIER; + sigmatch_table[DETECT_AL_HTTP_RAW_URI].alternative = DETECT_HTTP_URI_RAW; + + /* http.uri.raw sticky buffer */ + sigmatch_table[DETECT_HTTP_URI_RAW].name = "http.uri.raw"; + sigmatch_table[DETECT_HTTP_URI_RAW].desc = "sticky buffer to match specifically and only on the raw HTTP URI buffer"; + sigmatch_table[DETECT_HTTP_URI_RAW].url = "/rules/http-keywords.html#http-uri-and-http-raw-uri"; + sigmatch_table[DETECT_HTTP_URI_RAW].Setup = DetectHttpRawUriSetupSticky; + sigmatch_table[DETECT_HTTP_URI_RAW].flags |= SIGMATCH_NOOPT|SIGMATCH_INFO_STICKY_BUFFER; + + DetectAppLayerInspectEngineRegister2("http_raw_uri", ALPROTO_HTTP1, SIG_FLAG_TOSERVER, + HTP_REQUEST_LINE, DetectEngineInspectBufferGeneric, GetRawData); + + DetectAppLayerMpmRegister2("http_raw_uri", SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister, + GetRawData, ALPROTO_HTTP1, HTP_REQUEST_LINE); + + // no difference between raw and decoded uri for HTTP2 + DetectAppLayerInspectEngineRegister2("http_raw_uri", ALPROTO_HTTP2, SIG_FLAG_TOSERVER, + HTTP2StateDataClient, DetectEngineInspectBufferGeneric, GetData2); + + DetectAppLayerMpmRegister2("http_raw_uri", SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister, + GetData2, ALPROTO_HTTP2, HTTP2StateDataClient); + + DetectBufferTypeSetDescriptionByName("http_raw_uri", + "raw http uri"); + + DetectBufferTypeRegisterSetupCallback("http_raw_uri", + DetectHttpRawUriSetupCallback); + + DetectBufferTypeRegisterValidateCallback("http_raw_uri", + DetectHttpRawUriValidateCallback); + + g_http_raw_uri_buffer_id = DetectBufferTypeGetByName("http_raw_uri"); +} + +/** + * \brief this function setups the http_uri modifier keyword used in the rule + * + * \param de_ctx Pointer to the Detection Engine Context + * \param s Pointer to the Signature to which the current keyword belongs + * \param str Should hold an empty string always + * + * \retval 0 On success + * \retval -1 On failure + */ + +int DetectHttpUriSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str) +{ + return DetectEngineContentModifierBufferSetup( + de_ctx, s, str, DETECT_AL_HTTP_URI, g_http_uri_buffer_id, ALPROTO_HTTP1); +} + +static bool DetectHttpUriValidateCallback(const Signature *s, const char **sigerror) +{ + return DetectUrilenValidateContent(s, g_http_uri_buffer_id, sigerror); +} + +static void DetectHttpUriSetupCallback(const DetectEngineCtx *de_ctx, + Signature *s) +{ + SCLogDebug("callback invoked by %u", s->id); + DetectUrilenApplyToContent(s, g_http_uri_buffer_id); +} + +/** + * \brief this function setup the http.uri keyword used in the rule + * + * \param de_ctx Pointer to the Detection Engine Context + * \param s Pointer to the Signature to which the current keyword belongs + * \param str Should hold an empty string always + * + * \retval 0 On success + */ +static int DetectHttpUriSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str) +{ + if (DetectBufferSetActiveList(de_ctx, s, g_http_uri_buffer_id) < 0) + return -1; + if (DetectSignatureSetAppProto(s, ALPROTO_HTTP) < 0) + return -1; + return 0; +} + +static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx, + const DetectEngineTransforms *transforms, Flow *_f, + const uint8_t _flow_flags, void *txv, const int list_id) +{ + SCEnter(); + + InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id); + if (!buffer->initialized) { + htp_tx_t *tx = (htp_tx_t *)txv; + HtpTxUserData *tx_ud = htp_tx_get_user_data(tx); + + if (tx_ud == NULL || tx_ud->request_uri_normalized == NULL) { + SCLogDebug("no tx_id or uri"); + return NULL; + } + + const uint32_t data_len = bstr_len(tx_ud->request_uri_normalized); + const uint8_t *data = bstr_ptr(tx_ud->request_uri_normalized); + + InspectionBufferSetup(det_ctx, list_id, buffer, data, data_len); + InspectionBufferApplyTransforms(buffer, transforms); + } + + return buffer; +} + +static InspectionBuffer *GetData2(DetectEngineThreadCtx *det_ctx, + const DetectEngineTransforms *transforms, Flow *_f, const uint8_t _flow_flags, void *txv, + const int list_id) +{ + SCEnter(); + + InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id); + if (!buffer->initialized) { + uint32_t b_len = 0; + const uint8_t *b = NULL; + + if (rs_http2_tx_get_uri(txv, &b, &b_len) != 1) + return NULL; + if (b == NULL || b_len == 0) + return NULL; + + InspectionBufferSetup(det_ctx, list_id, buffer, b, b_len); + InspectionBufferApplyTransforms(buffer, transforms); + } + + return buffer; +} + +/** + * \brief Sets up the http_raw_uri modifier keyword. + * + * \param de_ctx Pointer to the Detection Engine Context. + * \param s Pointer to the Signature to which the current keyword belongs. + * \param arg Should hold an empty string always. + * + * \retval 0 On success. + * \retval -1 On failure. + */ +static int DetectHttpRawUriSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg) +{ + return DetectEngineContentModifierBufferSetup( + de_ctx, s, arg, DETECT_AL_HTTP_RAW_URI, g_http_raw_uri_buffer_id, ALPROTO_HTTP1); +} + +static bool DetectHttpRawUriValidateCallback(const Signature *s, const char **sigerror) +{ + return DetectUrilenValidateContent(s, g_http_raw_uri_buffer_id, sigerror); +} + +static void DetectHttpRawUriSetupCallback(const DetectEngineCtx *de_ctx, + Signature *s) +{ + SCLogDebug("callback invoked by %u", s->id); + DetectUrilenApplyToContent(s, g_http_raw_uri_buffer_id); +} + +/** + * \brief this function setup the http.uri.raw keyword used in the rule + * + * \param de_ctx Pointer to the Detection Engine Context + * \param s Pointer to the Signature to which the current keyword belongs + * \param str Should hold an empty string always + * + * \retval 0 On success + */ +static int DetectHttpRawUriSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str) +{ + if (DetectBufferSetActiveList(de_ctx, s, g_http_raw_uri_buffer_id) < 0) + return -1; + if (DetectSignatureSetAppProto(s, ALPROTO_HTTP) < 0) + return -1; + return 0; +} + +static InspectionBuffer *GetRawData(DetectEngineThreadCtx *det_ctx, + const DetectEngineTransforms *transforms, Flow *_f, + const uint8_t _flow_flags, void *txv, const int list_id) +{ + SCEnter(); + + InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id); + if (!buffer->initialized) { + htp_tx_t *tx = (htp_tx_t *)txv; + if (unlikely(tx->request_uri == NULL)) { + return NULL; + } + const uint32_t data_len = bstr_len(tx->request_uri); + const uint8_t *data = bstr_ptr(tx->request_uri); + + InspectionBufferSetup(det_ctx, list_id, buffer, data, data_len); + InspectionBufferApplyTransforms(buffer, transforms); + } + + return buffer; +} + +#ifdef UNITTESTS /* UNITTESTS */ +#include "tests/detect-http-uri.c" +#endif /* UNITTESTS */ + +/** + * @} + */ |