From: Philippe Antoine <contact@catenacyber.fr>
Date: Mon, 26 Apr 2021 13:37:57 +0000 (+0200)
Subject: http2: http.host.raw keyword now works for HTTP2
X-Git-Tag: suricata-6.0.3~25
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f81985596b35a1bb838cea6b194a152498c2d76d;p=thirdparty%2Fsuricata.git

http2: http.host.raw keyword now works for HTTP2

(cherry picked from commit df039555bce1ca52f93a34cd1dc8f8ef43e6d05d)
---

diff --git a/rust/src/http2/detect.rs b/rust/src/http2/detect.rs
index bb5fdcb6ac..d44435c11c 100644
--- a/rust/src/http2/detect.rs
+++ b/rust/src/http2/detect.rs
@@ -540,6 +540,18 @@ pub unsafe extern "C" fn rs_http2_tx_get_method(
     return 0;
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn rs_http2_tx_get_host(
+    tx: &mut HTTP2Transaction, buffer: *mut *const u8, buffer_len: *mut u32,
+) -> u8 {
+    if let Ok(value) = http2_frames_get_header_value(&tx.frames_ts, ":authority") {
+        *buffer = value.as_ptr(); //unsafe
+        *buffer_len = value.len() as u32;
+        return 1;
+    }
+    return 0;
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn rs_http2_tx_get_useragent(
     tx: &mut HTTP2Transaction, buffer: *mut *const u8, buffer_len: *mut u32,
diff --git a/src/detect-http-host.c b/src/detect-http-host.c
index 0870fd920f..d470105469 100644
--- a/src/detect-http-host.c
+++ b/src/detect-http-host.c
@@ -68,6 +68,9 @@ 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 DetectHttpHRHSetup(DetectEngineCtx *, Signature *, const char *);
 static int g_http_raw_host_buffer_id = 0;
 static int DetectHttpHostRawSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str);
@@ -138,6 +141,12 @@ void DetectHttpHHRegister(void)
             PrefilterGenericMpmRegister, GetRawData, ALPROTO_HTTP,
             HTP_REQUEST_HEADERS);
 
+    DetectAppLayerInspectEngineRegister2("http_raw_host", ALPROTO_HTTP2, SIG_FLAG_TOSERVER,
+            HTTP2StateDataClient, DetectEngineInspectBufferGeneric, GetData2);
+
+    DetectAppLayerMpmRegister2("http_raw_host", SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister,
+            GetData2, ALPROTO_HTTP2, HTTP2StateDataClient);
+
     DetectBufferTypeSetDescriptionByName("http_raw_host",
             "http raw host header");
 
@@ -240,6 +249,27 @@ static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
     return buffer;
 }
 
+static InspectionBuffer *GetData2(DetectEngineThreadCtx *det_ctx,
+        const DetectEngineTransforms *transforms, Flow *_f, const uint8_t _flow_flags, void *txv,
+        const int list_id)
+{
+    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_host(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 The setup function for the http_raw_host keyword for a signature.
  *
@@ -275,7 +305,7 @@ static int DetectHttpHostRawSetupSticky(DetectEngineCtx *de_ctx, Signature *s, c
     if (DetectBufferSetActiveList(s, g_http_raw_host_buffer_id) < 0)
         return -1;
     if (DetectSignatureSetAppProto(s, ALPROTO_HTTP) < 0)
-       return -1;
+        return -1;
     return 0;
 }