ssh: trigger raw stream inspection

Internals
---------
Suricata's stream engine returns data for inspection to the detection
engine from the stream when the chunk size is reached.

Bug
---
Inspection triggered only in the specified chunk sizes may be too late
when it comes to inspection of smaller protocol specific data which
could result in delayed inspection, incorrect data logged with a transaction
and logs misindicating the pkt that triggered an alert.

Fix
---
Fix this by making an explicit call from all respective applayer parsers to
trigger raw stream inspection which shall make the data available for inspection
in the following call of the stream engine. This needs to happen per direction
on the completion of an entity like a request or a response.

Important notes
---------------
1. The above mentioned behavior with and without this patch is
affected internally by the following conditions.
- inspection depth
- stream depth
In these special cases, the inspection window will be affected and
Suricata may not consider all the data that could be expected to be
inspected.
2. This only applies to applayer protocols running over TCP.
3. The inspection window is only considered up to the ACK'd data.
4. This entire issue is about IDS mode only.

SSH parser creates a new record per request or response. Appropriate calls
to trigger raw stream inspection have been added on succesful parsing of
each request and response.

Task 7026
Bug 7004

diff --git a/rust/src/ssh/ssh.rs b/rust/src/ssh/ssh.rs
index 174644d85b49074f2691f98e7068544867978454..548fea9db3bd913425a81e52675dcb54831919f1 100644 (file)
--- a/rust/src/ssh/ssh.rs
+++ b/rust/src/ssh/ssh.rs
@@ -1,4 +1,4 @@
-/* Copyright (C) 2020 Open Information Security Foundation
+/* Copyright (C) 2020-2025 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
@@ -344,6 +344,12 @@ impl SSHState {
                     if r.is_incomplete() {
                         //adds bytes consumed by banner to incomplete result
                         r.consumed += (input.len() - rem.len()) as u32;
+                    } else if r.is_ok() {
+                        let mut dir = Direction::ToServer as i32;
+                        if resp {
+                            dir = Direction::ToClient as i32;
+                        }
+                        sc_app_layer_parser_trigger_raw_stream_inspection(flow, dir);
                     }
                     return r;
                 }
@@ -384,6 +390,12 @@ impl SSHState {
                 if r.is_incomplete() {
                     //adds bytes consumed by banner to incomplete result
                     r.consumed += (input.len() - rem.len()) as u32;
+                } else if r.is_ok() {
+                    let mut dir = Direction::ToServer as i32;
+                    if resp {
+                        dir = Direction::ToClient as i32;
+                    }
+                    sc_app_layer_parser_trigger_raw_stream_inspection(flow, dir);
                 }
                 return r;
             }