http2: makes all HTTP1 header keywords work

(cherry picked from commit 017e39d8fd)

rust/src/http2/detect.rs

@@ -564,6 +564,27 @@ pub unsafe extern "C" fn rs_http2_tx_get_useragent(
     return 0;
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn rs_http2_tx_get_header_value(
+    tx: &mut HTTP2Transaction, direction: u8, strname: *const std::os::raw::c_char,
+    buffer: *mut *const u8, buffer_len: *mut u32,
+) -> u8 {
+    let hname: &CStr = CStr::from_ptr(strname); //unsafe
+    if let Ok(s) = hname.to_str() {
+        let frames = if direction == STREAM_TOSERVER {
+            &tx.frames_ts
+        } else {
+            &tx.frames_tc
+        };
+        if let Ok(value) = http2_frames_get_header_value(frames, &s.to_lowercase()) {
+            *buffer = value.as_ptr(); //unsafe
+            *buffer_len = value.len() as u32;
+            return 1;
+        }
+    }
+    return 0;
+}
+
 fn http2_escape_header(hd: &parser::HTTP2FrameHeaders, i: u32) -> Vec<u8> {
     //minimum size + 2 for escapes
     let normalsize = hd.blocks[i as usize].value.len() + 2 + hd.blocks[i as usize].name.len() + 2;

src/detect-http-headers-stub.h

@@ -81,6 +81,29 @@ static InspectionBuffer *GetRequestData(DetectEngineThreadCtx *det_ctx,
     return buffer;
 }
 
+static InspectionBuffer *GetRequestData2(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_header_value(txv, STREAM_TOSERVER, HEADER_NAME, &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;
+}
+
 #endif
 #ifdef KEYWORD_TOCLIENT
 static InspectionBuffer *GetResponseData(DetectEngineThreadCtx *det_ctx,
@@ -113,6 +136,29 @@ static InspectionBuffer *GetResponseData(DetectEngineThreadCtx *det_ctx,
 
     return buffer;
 }
+
+static InspectionBuffer *GetResponseData2(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_header_value(txv, STREAM_TOCLIENT, HEADER_NAME, &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;
+}
 #endif
 
 /**
@@ -147,24 +193,28 @@ static void DetectHttpHeadersRegisterStub(void)
     sigmatch_table[KEYWORD_ID].flags |= SIGMATCH_NOOPT | SIGMATCH_INFO_STICKY_BUFFER;
 
 #ifdef KEYWORD_TOSERVER
-    DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOSERVER, 2,
-            PrefilterGenericMpmRegister, GetRequestData,
-            ALPROTO_HTTP, HTP_REQUEST_HEADERS);
+    DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister,
+            GetRequestData, ALPROTO_HTTP, HTP_REQUEST_HEADERS);
+    DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister,
+            GetRequestData2, ALPROTO_HTTP2, HTTP2StateDataClient);
 #endif
 #ifdef KEYWORD_TOCLIENT
-    DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOCLIENT, 2,
-            PrefilterGenericMpmRegister, GetResponseData,
-            ALPROTO_HTTP, HTP_RESPONSE_HEADERS);
+    DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOCLIENT, 2, PrefilterGenericMpmRegister,
+            GetResponseData, ALPROTO_HTTP, HTP_RESPONSE_HEADERS);
+    DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOCLIENT, 2, PrefilterGenericMpmRegister,
+            GetResponseData2, ALPROTO_HTTP2, HTTP2StateDataServer);
 #endif
 #ifdef KEYWORD_TOSERVER
-    DetectAppLayerInspectEngineRegister2(BUFFER_NAME,
-            ALPROTO_HTTP, SIG_FLAG_TOSERVER, HTP_REQUEST_HEADERS,
-            DetectEngineInspectBufferGeneric, GetRequestData);
+    DetectAppLayerInspectEngineRegister2(BUFFER_NAME, ALPROTO_HTTP, SIG_FLAG_TOSERVER,
+            HTP_REQUEST_HEADERS, DetectEngineInspectBufferGeneric, GetRequestData);
+    DetectAppLayerInspectEngineRegister2(BUFFER_NAME, ALPROTO_HTTP2, SIG_FLAG_TOSERVER,
+            HTTP2StateDataClient, DetectEngineInspectBufferGeneric, GetRequestData2);
 #endif
 #ifdef KEYWORD_TOCLIENT
-    DetectAppLayerInspectEngineRegister2(BUFFER_NAME,
-            ALPROTO_HTTP, SIG_FLAG_TOCLIENT, HTP_RESPONSE_HEADERS,
-            DetectEngineInspectBufferGeneric, GetResponseData);
+    DetectAppLayerInspectEngineRegister2(BUFFER_NAME, ALPROTO_HTTP, SIG_FLAG_TOCLIENT,
+            HTP_RESPONSE_HEADERS, DetectEngineInspectBufferGeneric, GetResponseData);
+    DetectAppLayerInspectEngineRegister2(BUFFER_NAME, ALPROTO_HTTP2, SIG_FLAG_TOCLIENT,
+            HTTP2StateDataServer, DetectEngineInspectBufferGeneric, GetResponseData2);
 #endif
 
     DetectBufferTypeSetDescriptionByName(BUFFER_NAME, BUFFER_DESC);