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+/* 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 Gurvinder Singh <gurvindersinghdahiya@gmail.com>
+ * \author Anoop Saldanha <anoopsaldanha@gmail.com>
+ *
+ * Implements the http_stat_code keyword
+ */
+
+#include "suricata-common.h"
+#include "threads.h"
+#include "decode.h"
+#include "detect.h"
+
+#include "detect-parse.h"
+#include "detect-engine.h"
+#include "detect-content.h"
+#include "detect-pcre.h"
+#include "detect-engine-mpm.h"
+#include "detect-engine-prefilter.h"
+
+#include "flow.h"
+#include "flow-var.h"
+#include "flow-util.h"
+
+#include "util-debug.h"
+#include "util-error.h"
+#include "util-unittest.h"
+#include "util-unittest-helper.h"
+#include "util-spm.h"
+#include "util-print.h"
+
+#include "app-layer.h"
+#include "app-layer-parser.h"
+
+#include "app-layer-htp.h"
+#include "detect-http-stat-code.h"
+#include "stream-tcp-private.h"
+#include "stream-tcp.h"
+
+static int DetectHttpStatCodeSetup(DetectEngineCtx *, Signature *, const char *);
+static int DetectHttpStatCodeSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str);
+#ifdef UNITTESTS
+static void DetectHttpStatCodeRegisterTests(void);
+#endif
+static int g_http_stat_code_buffer_id = 0;
+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);
+
+/**
+ * \brief Registration function for keyword: http_stat_code
+ */
+void DetectHttpStatCodeRegister (void)
+{
+ /* http_stat_code content modifier */
+ sigmatch_table[DETECT_AL_HTTP_STAT_CODE].name = "http_stat_code";
+ sigmatch_table[DETECT_AL_HTTP_STAT_CODE].desc = "content modifier to match only on HTTP stat-code-buffer";
+ sigmatch_table[DETECT_AL_HTTP_STAT_CODE].url = "/rules/http-keywords.html#http-stat-code";
+ sigmatch_table[DETECT_AL_HTTP_STAT_CODE].Setup = DetectHttpStatCodeSetup;
+#ifdef UNITTESTS
+ sigmatch_table[DETECT_AL_HTTP_STAT_CODE].RegisterTests = DetectHttpStatCodeRegisterTests;
+#endif
+ sigmatch_table[DETECT_AL_HTTP_STAT_CODE].flags |= SIGMATCH_NOOPT|SIGMATCH_INFO_CONTENT_MODIFIER;
+ sigmatch_table[DETECT_AL_HTTP_STAT_CODE].alternative = DETECT_HTTP_STAT_CODE;
+
+ /* http.stat_code content modifier */
+ sigmatch_table[DETECT_HTTP_STAT_CODE].name = "http.stat_code";
+ sigmatch_table[DETECT_HTTP_STAT_CODE].desc = "sticky buffer to match only on HTTP stat-code-buffer";
+ sigmatch_table[DETECT_HTTP_STAT_CODE].url = "/rules/http-keywords.html#http-stat-code";
+ sigmatch_table[DETECT_HTTP_STAT_CODE].Setup = DetectHttpStatCodeSetupSticky;
+ sigmatch_table[DETECT_HTTP_STAT_CODE].flags |= SIGMATCH_NOOPT|SIGMATCH_INFO_STICKY_BUFFER;
+
+ DetectAppLayerInspectEngineRegister2("http_stat_code", ALPROTO_HTTP1, SIG_FLAG_TOCLIENT,
+ HTP_RESPONSE_LINE, DetectEngineInspectBufferGeneric, GetData);
+
+ DetectAppLayerMpmRegister2("http_stat_code", SIG_FLAG_TOCLIENT, 4, PrefilterGenericMpmRegister,
+ GetData, ALPROTO_HTTP1, HTP_RESPONSE_LINE);
+
+ DetectAppLayerInspectEngineRegister2("http_stat_code", ALPROTO_HTTP2, SIG_FLAG_TOCLIENT,
+ HTTP2StateDataServer, DetectEngineInspectBufferGeneric, GetData2);
+
+ DetectAppLayerMpmRegister2("http_stat_code", SIG_FLAG_TOCLIENT, 4, PrefilterGenericMpmRegister,
+ GetData2, ALPROTO_HTTP2, HTTP2StateDataServer);
+
+ DetectBufferTypeSetDescriptionByName("http_stat_code",
+ "http response status code");
+
+ g_http_stat_code_buffer_id = DetectBufferTypeGetByName("http_stat_code");
+}
+
+/**
+ * \brief this function setups the http_stat_code 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
+ */
+
+static int DetectHttpStatCodeSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg)
+{
+ return DetectEngineContentModifierBufferSetup(
+ de_ctx, s, arg, DETECT_AL_HTTP_STAT_CODE, g_http_stat_code_buffer_id, ALPROTO_HTTP1);
+}
+
+/**
+ * \brief this function setup the http.stat_code 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 DetectHttpStatCodeSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str)
+{
+ if (DetectBufferSetActiveList(de_ctx, s, g_http_stat_code_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->inspect == NULL) {
+ htp_tx_t *tx = (htp_tx_t *)txv;
+
+ if (tx->response_status == NULL)
+ return NULL;
+
+ const uint32_t data_len = bstr_len(tx->response_status);
+ const uint8_t *data = bstr_ptr(tx->response_status);
+
+ 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->inspect == NULL) {
+ uint32_t b_len = 0;
+ const uint8_t *b = NULL;
+
+ if (rs_http2_tx_get_status(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;
+}
+
+#ifdef UNITTESTS
+#include "tests/detect-http-stat-code.c"
+#endif /* UNITTESTS */
+
+/**
+ * @}
+ */
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