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auth: Allow users without a domain

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Some deployments already have users that authenticate without a domain.
Today, we refuse to even consider those, and reject them at parsing time.

However, it is a use-case worth supporting, at least with some
restrictions that make the complexity manageable.

This patch changes the auth package to support authenticating users
without an "@domain" part.

Those requests will always be directly passed on to the fallback
authenticator, if available.

The dovecot fallback authenticator can already handle this case just fine.
This commit is contained in:
Alberto Bertogli
2021-06-11 20:05:41 +01:00
parent 099e2e2269
commit cfe0e48c0a
7 changed files with 48 additions and 21 deletions
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5
test/t-11-dovecot/config/dovecot.conf.in
View File

@@ -5,10 +5,11 @@ ssl = no
default_internal_user = $USER
default_login_user = $USER
# Before auth checks, rename "u@d" to "u-AT-d". This exercises that chasquid
# Before auth checks, rename "u@d" to "u-x". This exercises that chasquid
# handles well the case where the returned user information does not match the
# requested user.
auth_username_format = "%n-AT-%d"
# We drop the domain, to exercise "naked" auth handling.
auth_username_format = "%n-x"
passdb {
driver = passwd-file

3
test/t-11-dovecot/config/passwd
View File

@@ -1 +1,2 @@
user-AT-srv:{plain}password:1000:1000::/home/user
user-x:{plain}password:1000:1000::/home/user
naked-x:{plain}gun:1001:1001::/home/naked

5
test/t-11-dovecot/msmtprc
View File

@@ -26,3 +26,8 @@ password secretpassword
account badpasswd : default
user user@srv
password badsecretpassword
account naked : default
from naked@srv
user naked
password gun

13
test/t-11-dovecot/run.sh
View File

@@ -51,11 +51,22 @@ mkdir -p .logs
chasquid -v=2 --logfile=.logs/chasquid.log --config_dir=config &
wait_until_ready 1025
# Send an email as user@srv successfully.
# Send an email as "user@srv" successfully.
run_msmtp user@srv < content
wait_for_file .mail/user@srv
mail_diff content .mail/user@srv
# Send an email as "naked" successfully.
rm .mail/user@srv
run_msmtp -a naked user@srv < content
wait_for_file .mail/user@srv
mail_diff content .mail/user@srv
# Send an email to the "naked" user successfully.
run_msmtp naked@srv < content
wait_for_file .mail/naked@srv
mail_diff content .mail/naked@srv
# Fail to send to nobody@srv (user does not exist).
if run_msmtp nobody@srv < content 2> /dev/null; then
fail "successfuly sent an email to a non-existent user"