[pmg-devel] [PATCH v2 log-tracker] close #2106: show outgoing TLS connection in tracking center

[Stoiko Ivanov]

LGTM now!

Tested-By: Stoiko Ivanov <s.ivanov at proxmox.com>
Reviewed-By: Stoiko Ivanov <s.ivanov at proxmox.com>

On Mon, 22 Mar 2021 13:23:27 +0100
Mira Limbeck <m.limbeck at proxmox.com> wrote:

> This is a best effort try to add the outgoing TLS connection information
> to the output of pmg-log-tracker. The only thing we can match on is the
> PID of the 'smtp' process. In the code we asumme that the TLS log entry
> always happens before the actual smtp send entry that has a QID. This means
> we save the TLS log entry in a map with the PID as key and then, once the
> send entry happens, we look it up and add the log entry to the QEntry's
> logs.
> 
> Signed-off-by: Mira Limbeck <m.limbeck at proxmox.com>
> ---
> v2:
>  - added 'Untrusted' line match as well
> 
>  src/main.rs | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/src/main.rs b/src/main.rs
> index 5069252..a186620 100644
> --- a/src/main.rs
> +++ b/src/main.rs
> @@ -378,6 +378,18 @@ fn handle_qmgr_message(msg: &[u8], parser: &mut Parser, complete_line: &[u8]) {
>  
>  // handle log entries for 'lmtp', 'smtp', 'error' and 'local'
>  fn handle_lmtp_message(msg: &[u8], parser: &mut Parser, complete_line: &[u8]) {
> +    if msg.starts_with(b"Trusted TLS connection established to")
> +        || msg.starts_with(b"Untrusted TLS connection established to")
> +    {
> +        // the only way to match outgoing TLS connections is by smtp pid
> +        // this message has to appear before the 'qmgr: <QID>: removed' entry in the log
> +        parser.smtp_tls_log_by_pid.insert(
> +            parser.current_record_state.pid,
> +            (complete_line.into(), parser.lines),
> +        );
> +        return;
> +    }
> +
>      let (qid, data) = match parse_qid(msg, 15) {
>          Some((q, t)) => (q, t),
>          None => return,
> @@ -393,6 +405,14 @@ fn handle_lmtp_message(msg: &[u8], parser: &mut Parser, complete_line: &[u8]) {
>          .log
>          .push((complete_line.into(), parser.lines));
>  
> +    // assume the TLS log entry always appears before as it is the same process
> +    if let Some(log_line) = parser
> +        .smtp_tls_log_by_pid
> +        .remove(&parser.current_record_state.pid)
> +    {
> +        qe.borrow_mut().log.push(log_line);
> +    }
> +
>      let data = &data[2..];
>      if !data.starts_with(b"to=<") {
>          return;
> @@ -1668,6 +1688,8 @@ struct Parser {
>      fentries: HashMap<Box<[u8]>, Rc<RefCell<FEntry>>>,
>      qentries: HashMap<Box<[u8]>, Rc<RefCell<QEntry>>>,
>  
> +    smtp_tls_log_by_pid: HashMap<u64, (Box<[u8]>, u64)>,
> +
>      current_record_state: RecordState,
>      rel_line_nr: u64,
>  
> @@ -1705,6 +1727,7 @@ impl Parser {
>              sentries: HashMap::new(),
>              fentries: HashMap::new(),
>              qentries: HashMap::new(),
> +            smtp_tls_log_by_pid: HashMap::new(),
>              current_record_state: Default::default(),
>              rel_line_nr: 0,
>              current_year: years,