Hello,
I want to set up a Postfix SMTP server with cyrus-sasl in GSSAPI mode. I have two Samba4 servers in AD mode, and my clients are in windows 10.
I removed the execution of Posfix in chroot to simplify.
I added two keytab in /etc/krb5.keytab smtp/smtptest.domain.fr and host/smtptest.domain.fr
Currently I can authenticate with windows credentials from a windows client under Thunderbird with the "normal password" settings.
But if I try to switch from LOGIN to GSSAPI ( in /etc/postfix/sasl/smtpd.conf ) it doesn't work, here is the message in Thunderbird ( Sending of the message failed.
The Kerberos/GSSAPI ticket was not accepted by the Outgoing server (SMTP). Please check that you are logged in to the Kerberos/GSSAPI realm.)
Here are some settings :
klist -k -t /etc/krb5.keytab
Keytab name: FILE:/etc/krb5.keytab
KVNO Timestamp Principal
---- ------------------- ------------------------------------------------------
2 16/09/2021 16:00:44 host/smtptest.domain.fr@xxxxxxx
2 16/09/2021 16:28:14 smtp/smtptest.domain.fr@xxxxxxx
2 20/09/2021 09:19:41 smtpd/smtptest.domain.fr@xxxxxxx
/etc/default/saslauthd :
START=yes
DESC="SASL Auth. Daemon"
NAME="saslauthd"
MECHANISMS="kerberos5"
MECH_OPTIONS=""
THREADS=1
OPTIONS="-c -m /var/run/saslauthd"
root@smtptest:~# saslfinger -s
saslfinger - postfix Cyrus sasl configuration lun. 20 sept. 2021 09:53:49 CEST
version: 1.0.4
mode: server-side SMTP AUTH
-- basics --
Postfix: 3.5.6
System: Debian GNU/Linux 11 \n \l
-- smtpd is linked to --
libsasl2.so.2 => /lib/x86_64-linux-gnu/libsasl2.so.2 (0x00007f87cfe08000)
-- active SMTP AUTH and TLS parameters for smtpd --
broken_sasl_auth_clients = yes
smtpd_sasl_auth_enable = yes
smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key
smtpd_tls_security_level = may
-- listing of /usr/lib/sasl2 --
total 16
drwxr-xr-x 2 root root 4096 14 sept. 14:31 .
drwxr-xr-x 54 root root 4096 3 sept. 09:46 ..
-rw-r--r-- 1 root root 4 14 sept. 14:31 berkeley_db.active
-rw-r--r-- 1 root root 4 7 févr. 2021 berkeley_db.txt
-- listing of /etc/postfix/sasl --
total 12
drwxr-xr-x 2 root root 4096 20 sept. 09:24 .
drwxr-xr-x 5 root root 4096 17 sept. 16:43 ..
-rw-r--r-- 1 root root 160 20 sept. 09:24 smtpd.conf
-- content of /etc/postfix/sasl/smtpd.conf --
pwcheck_method: saslauthd
mech_list: GSSAPI
keytab: /etc/krb5.keytab
log_level: 7
-- active services in /etc/postfix/master.cf --
# service type private unpriv chroot wakeup maxproc command + args
# (yes) (yes) (no) (never) (100)
submission inet n - n - - smtpd -v
-o syslog_name=postfix/submission
-o smtpd_sasl_auth_enable=yes
pickup unix n - y 60 1 pickup
cleanup unix n - y - 0 cleanup
qmgr unix n - n 300 1 qmgr
tlsmgr unix - - y 1000? 1 tlsmgr
rewrite unix - - y - - trivial-rewrite
bounce unix - - y - 0 bounce
defer unix - - y - 0 bounce
trace unix - - y - 0 bounce
verify unix - - y - 1 verify
flush unix n - y 1000? 0 flush
proxymap unix - - n - - proxymap
proxywrite unix - - n - 1 proxymap
smtp unix - - n - - smtp
relay unix - - y - - smtp
-o syslog_name=postfix/$service_name
showq unix n - y - - showq
error unix - - y - - error
retry unix - - y - - error
discard unix - - y - - discard
local unix - n n - - local
virtual unix - n n - - virtual
lmtp unix - - y - - lmtp
anvil unix - - y - 1 anvil
scache unix - - y - 1 scache
postlog unix-dgram n - n - 1 postlogd
maildrop unix - n n - - pipe
flags=DRXhu user=vmail argv=/usr/bin/maildrop -d ${recipient}
uucp unix - n n - - pipe
flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
ifmail unix - n n - - pipe
flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
bsmtp unix - n n - - pipe
flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient
scalemail-backend unix - n n - 2 pipe
flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}
mailman unix - n n - - pipe
flags=FRX user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py ${nexthop} ${user}
-- mechanisms on localhost --
-- end of saslfinger output --
If anyone can help me....
Thanks in advance.
Samuel
