--- /dev/null
+/* Copyright (C) 2022 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.
+ */
+
+use std::ptr;
+
+#[no_mangle]
+pub unsafe extern "C" fn rs_get_domain(input: *const u8, len: u32, output: *mut u8, olen: *mut u64) -> bool {
+ let slice: &[u8] = std::slice::from_raw_parts(input as *mut u8, len as usize);
+ let result = psl::domain(slice);
+ match result {
+ Some(x) => {
+ let domain = x.as_bytes();
+ ptr::copy(domain.as_ptr(), output, domain.len());
+ *olen = domain.len() as u64;
+ true
+ },
+ None => false
+ }
+}
--- /dev/null
+/* Copyright (C) 2022 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.
+ */
+
+/**
+ * \file
+ *
+ * \author Eric Leblond <el@stamus-networks.com>
+ *
+ * Implements the domain extraction transformation
+ */
+
+#include "suricata-common.h"
+
+#include "detect.h"
+#include "detect-engine.h"
+#include "detect-engine-prefilter.h"
+#include "detect-parse.h"
+#include "detect-transform-domain.h"
+#include "detect-engine-build.h"
+
+#include "util-unittest.h"
+#include "util-print.h"
+#include "util-memrchr.h"
+#include "util-memcpy.h"
+#include "rust.h"
+
+static int DetectTransformDomainSetup(DetectEngineCtx *, Signature *, const char *);
+#ifdef UNITTESTS
+static void DetectTransformDomainRegisterTests(void);
+#endif
+static void TransformDomain(DetectEngineThreadCtx *ctx, InspectionBuffer *buffer, void *options);
+
+void DetectTransformDomainRegister(void)
+{
+ sigmatch_table[DETECT_TRANSFORM_DOMAIN].name = "domain";
+ sigmatch_table[DETECT_TRANSFORM_DOMAIN].desc = "modify buffer to extract the domain";
+ sigmatch_table[DETECT_TRANSFORM_DOMAIN].url = "/rules/transforms.html#domain";
+ sigmatch_table[DETECT_TRANSFORM_DOMAIN].Transform = TransformDomain;
+ sigmatch_table[DETECT_TRANSFORM_DOMAIN].Setup = DetectTransformDomainSetup;
+#ifdef UNITTESTS
+ sigmatch_table[DETECT_TRANSFORM_DOMAIN].RegisterTests = DetectTransformDomainRegisterTests;
+#endif
+ sigmatch_table[DETECT_TRANSFORM_DOMAIN].flags |= SIGMATCH_NOOPT;
+}
+
+/**
+ * \internal
+ * \brief Extract the dotprefix, if any, the last pattern match, either content or uricontent
+ * \param det_ctx detection engine ctx
+ * \param s signature
+ * \param nullstr should be null
+ * \retval 0 ok
+ * \retval -1 failure
+ */
+static int DetectTransformDomainSetup(DetectEngineCtx *de_ctx, Signature *s, const char *nullstr)
+{
+ SCEnter();
+ int r = DetectSignatureAddTransform(s, DETECT_TRANSFORM_DOMAIN, NULL);
+ SCReturnInt(r);
+}
+
+/**
+ * \brief Return the domain, if any, in the last pattern match.
+ *
+ */
+static void TransformDomain(DetectEngineThreadCtx *ctx, InspectionBuffer *buffer, void *options)
+{
+ const size_t input_len = buffer->inspect_len;
+ uint64_t output_len = 0;
+
+ if (input_len) {
+ uint8_t output[input_len];
+
+ bool res = rs_get_domain(buffer->inspect, input_len, output, &output_len);
+ if (res == true) {
+ InspectionBufferCopy(buffer, output, output_len);
+ }
+ }
+}
+
+#ifdef UNITTESTS
+static int DetectTransformDomainTest01(void)
+{
+ const uint8_t *input = (const uint8_t *)"www.example.com";
+ uint32_t input_len = strlen((char *)input);
+
+ const char *result = "example.com";
+ uint32_t result_len = strlen((char *)result);
+
+ InspectionBuffer buffer;
+ InspectionBufferInit(&buffer, input_len);
+ InspectionBufferSetup(NULL, -1, &buffer, input, input_len);
+ PrintRawDataFp(stdout, buffer.inspect, buffer.inspect_len);
+ TransformDomain(NULL, &buffer, NULL);
+ PrintRawDataFp(stdout, buffer.inspect, buffer.inspect_len);
+ FAIL_IF_NOT(buffer.inspect_len == result_len);
+ FAIL_IF_NOT(strncmp(result, (const char *)buffer.inspect, result_len) == 0);
+ InspectionBufferFree(&buffer);
+ PASS;
+}
+
+static int DetectTransformDomainTest02(void)
+{
+ const uint8_t *input = (const uint8_t *)"hello.example.co.uk";
+ uint32_t input_len = strlen((char *)input);
+
+ const char *result = "example.co.uk";
+ uint32_t result_len = strlen((char *)result);
+
+ InspectionBuffer buffer;
+ InspectionBufferInit(&buffer, input_len);
+ InspectionBufferSetup(NULL, -1, &buffer, input, input_len);
+ PrintRawDataFp(stdout, buffer.inspect, buffer.inspect_len);
+ TransformDomain(NULL, &buffer, NULL);
+ PrintRawDataFp(stdout, buffer.inspect, buffer.inspect_len);
+ FAIL_IF_NOT(buffer.inspect_len == result_len);
+ FAIL_IF_NOT(strncmp(result, (const char *)buffer.inspect, result_len) == 0);
+ InspectionBufferFree(&buffer);
+ PASS;
+}
+
+static int DetectTransformDomainTest03(void)
+{
+ const char rule[] =
+ "alert dns any any -> any any (dns.query; domain; content:\"google.com\"; sid:1;)";
+ ThreadVars th_v;
+ DetectEngineThreadCtx *det_ctx = NULL;
+ memset(&th_v, 0, sizeof(th_v));
+
+ DetectEngineCtx *de_ctx = DetectEngineCtxInit();
+ FAIL_IF_NULL(de_ctx);
+ Signature *s = DetectEngineAppendSig(de_ctx, rule);
+ FAIL_IF_NULL(s);
+ SigGroupBuild(de_ctx);
+ DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx);
+ DetectEngineThreadCtxDeinit(&th_v, (void *)det_ctx);
+ DetectEngineCtxFree(de_ctx);
+ PASS;
+}
+
+static void DetectTransformDomainRegisterTests(void)
+{
+ UtRegisterTest("DetectTransformDomainTest01", DetectTransformDomainTest01);
+ UtRegisterTest("DetectTransformDomainTest02", DetectTransformDomainTest02);
+ UtRegisterTest("DetectTransformDomainTest03", DetectTransformDomainTest03);
+}
+#endif
projects / thirdparty / suricata.git / commitdiff
