https://bugs.exim.org/show_bug.cgi?id=1668
Bug ID: 1668
Summary: RFE: sasl_user_exists condition
Product: Exim
Version: 4.85+ HEAD
Hardware: All
OS: All
Status: NEW
Severity: wishlist
Priority: medium
Component: String expansion
Assignee: nigel@???
Reporter: bob@???
CC: exim-dev@???
Created attachment 827
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https://bugs.exim.org/attachment.cgi?id=827&action=edit
Patch to implement cyrus_sasl_user_exists expansion
Exim currently has support to perform authentication tests using libsasl2, for
the purposes of SMTP authentication. It's missing the ability to query whether
a local user exists, for the purpose of determining whether to reject a RCPT.
In general, the thing to do in this case is to perform an LMTP callout in order
to determine whether there is a mailbox that exists for the given recipient.
However, Cyrus IMAP now has a feature that allows mailboxes to be automatically
created upon successful login, or a delivery is made to a mailbox that doesn't
exist yet.
It would be exceedingly convenient to test for the existence of a local user in
the same SASL DB that Cyrus looks for users, rather than via LMTP so that we
can turn this automatic mailbox creation feature on without arbitrarily
creating a new mailbox for addresses no one will ever log into. This patch for
your consideration, allows for that by introducing a new string expansion
called "cyrus_sasl_user_exists", that expects a username, optional service, and
optional realm. Adding the condition to your LMTP router will let you specify:
acl_check_rcpt:
accept domains = +local_domains
verify = recipient
begin routers
cyrus:
driver = accept
domains = +local_domains
condition = ${if cyrus_sasl_user_exists{{$local_part}{$domain}}{1}}
transport = lmtp
no_more
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