BDAT to DATA translation on submission service when checkpassword is involved

23 Jul 2021


      Hello,
I'm having issues with Dovecot translating "BDAT" commands (CHUNKING)
into "DATA" commands when the backend does not support it in the
submission service. I use "checkpassword" to authenticate users and
judging by older mailing list entries the presence of "submission_*"
directives must be in place for Dovecot to translate. Even with these
directives set, the translation doesn't seem to occur.
checkpassword returns "director_tag=remote_smtp" (along with other
fields such as nopassword=y proxy=y) which in turn sets the backend host
to relay the connection to. I have a feeling the use of checkpassword
has something to do with this lack of translation.
If the "submission_*" directives must be in place for this translation
to occur, which ones are they? Can I return these fields from checkpassword?
Output of doveconf -n:
# 2.3.15 (0503334ab1): /etc/dovecot/dovecot.conf
# OS: Linux 4.15.0-147-generic x86_64 Ubuntu 18.04.5 LTS
# Hostname: xyz
auth_debug = yes
auth_debug_passwords = yes
auth_mechanisms = plain login
auth_verbose = yes
director_mail_servers = x.x.x.x@remote_smtp
director_servers = x.x.x.x
disable_plaintext_auth = no
mail_log_prefix = "%Us(%u) [%r]: "
passdb {
args = /usr/local/bin/checkpassword
driver = checkpassword
}
protocols = " imap pop3 submission"
service anvil {
client_limit = 3553
}
service auth {
client_limit = 3550
}
service director {
fifo_listener login/proxy-notify {
mode = 0600
user = $default_login_user
}
inet_listener {
address = x.x.x.x
port = 9090
}
unix_listener director-admin {
mode = 0600
}
unix_listener login/director {
mode = 0666
}
}
service imap-login {
executable = imap-login director
inet_listener imap {
address = x.x.x.x
port = 143
}
inet_listener imaps {
address = x.x.x.x
port = 993
ssl = yes
}
process_limit = 1000
process_min_avail = 0
service_count = 1
}
service imap {
process_limit = 2048
process_min_avail = 0
service_count = 1
vsz_limit = 384 M
}
service pop3-login {
executable = pop3-login director
inet_listener pop3 {
address = x.x.x.x
port = 110
}
inet_listener pop3s {
address = x.x.x.x
port = 995
ssl = yes
}
process_limit = 450
}
service pop3 {
process_limit = 190
process_min_avail = 0
service_count = 1
}
service submission-login {
executable = submission-login director
inet_listener smtp {
address = x.x.x.x
port = 25
}
inet_listener smtps {
address = x.x.x.x
port = 465
ssl = yes
}
inet_listener submission {
address = x.x.x.x
port = 587
}
process_limit = 2000
}
ssl_cert =

Dan Conway

Aki Tuomi

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