dovecot

dovecot@dovecot.org

October 2020

112 participants
112 discussions

dovecot lda deliver_log_format question
by rudolf＠padaru.de 01 Oct '20

01 Oct '20

Hey, i have an question about the deliver_log_format. My log looks sometimes like: Oct 1 09:38:01 dd44414 dovecot: lda(user)<20009><9MYzGVmHdV8pTgAA+v7NQw>: msgid=<20201001073801.628713AC05DC(a)myserver.com>: saved mail to INBOX The deliver_log_format settings are still on default. Are somebody able to explain me this part of the log message? <20009><9MYzGVmHdV8pTgAA+v7NQw>: What want dovecot to say with this? Mit freundlichen Grüßen Yours sincerely Pascal Rudolf

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debugging TLS with wireshark and a custom application ?
by Kurt Jaeger 01 Oct '20

01 Oct '20

Hi! My question is: can dovecot be used to debug/decrypt TLS sessions ? The reason I'm asking: A custom application wants to speak IMAP with TLS with a dovecot instance. It fails, and the error message is, unfortunatly, not very helpful. tcpdump shows that the session is established, but fails. The custom application says error 60000, not much more. There is a way to decode TLS sessions in some cases: https://wiki.wireshark.org/TLS using firefox and the enviroment variable SSLKEYLOGFILE. Basically, the TLS client (firefox), while negotiating keys with the other side, writes those logfiles to a logfile specified by SSLKEYLOGFILE and at the same time, wireshark is used to capture / write the pcap of the session. Then wireshark can be used to decode the contents of the TLS-encrypted session. Is something similiar possible with dovecot as the server and from the server side ? Is, by chance, the session=<...> value already such a key so that a tcpdump pcap file would be able to descrypt that session ? Sep 29 08:51:30 imap-login: Info: Login: user=<someuser>, method=PLAIN, rip=<someip>, lip=<someotherip>, mpid=63667, TLS, session=<GGF0Nm6wxy0qAQHoAAMAAwAAAAAAAAAB> -- pi(a)opsec.eu +49 171 3101372 Now what ?

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