On 10/27/19 14:34 +0000, David Faller wrote:
Dear All, I want to try my luck here, perhaps someone could help me.First The Problem: We would like to restrict the ldap authentication over saslauthd, so that users only can login with their valid e-mail address. At the moment users are able to login with usern...@domain.com or only their username. I tied a lot to specify the ldap_filter to take a lookup for the userPrincipalName=%u. With the command testsaslauthd it’s working but cyrus can’t grant access with errors like this: saslauthd.service - LSB: saslauthd startup script Loaded: loaded (/etc/init.d/saslauthd; generated) Active: active (running) since Fri 2019-10-25 14:07:54 CEST; 1h 33min ago Docs: man:systemd-sysv-generator(8) Process: 3707 ExecStart=/etc/init.d/saslauthd start (code=exited, status=0/SUCCESS) Tasks: 10 (limit: 4915) Memory: 15.4M CGroup: /system.slice/saslauthd.service ├─3727 /usr/sbin/saslauthd -a ldap -c -m /var/run/saslauthd -n 5 ├─3728 /usr/sbin/saslauthd -a ldap -c -m /var/run/saslauthd -n 5 ├─3729 /usr/sbin/saslauthd -a ldap -c -m /var/run/saslauthd -n 5 ├─3730 /usr/sbin/saslauthd -a ldap -c -m /var/run/saslauthd -n 5 ├─3733 /usr/sbin/saslauthd -a ldap -c -m /var/run/saslauthd -n 5 ├─3745 /usr/sbin/saslauthd -a ldap -c -m /var/spool/postfix/var/run/saslauthd -n 5 ├─3746 /usr/sbin/saslauthd -a ldap -c -m /var/spool/postfix/var/run/saslauthd -n 5 ├─3747 /usr/sbin/saslauthd -a ldap -c -m /var/spool/postfix/var/run/saslauthd -n 5 ├─3748 /usr/sbin/saslauthd -a ldap -c -m /var/spool/postfix/var/run/saslauthd -n 5 └─3749 /usr/sbin/saslauthd -a ldap -c -m /var/spool/postfix/var/run/saslauthd -n 5 Oct 25 15:38:27 CGSG saslauthd[3747]: : auth failure: [user=money] [service=smtp] [realm=uc-central.net] [mech=ldap] [reason=Unknown] Oct 25 15:39:07 CGSG saslauthd[3745]: Entry not found (sAMAccountName=account). Oct 25 15:39:07 CGSG saslauthd[3745]: Authentication failed for account/uc-central.net: User not found (-6) Oct 25 15:39:07 CGSG saslauthd[3745]: : auth failure: [user=account] [service=smtp] [realm=uc-central.net] [mech=ldap] [reason=Unknown] Oct 25 15:40:20 CGSG saslauthd[3748]: Entry not found (sAMAccountName=tg). Oct 25 15:40:20 CGSG saslauthd[3748]: Authentication failed for tg/uc-central.net: User not found (-6) Oct 25 15:40:20 CGSG saslauthd[3748]: : auth failure: [user=tg] [service=smtp] [realm=uc-central.net] [mech=ldap] [reason=Unknown] Oct 25 15:40:56 CGSG saslauthd[3746]: Entry not found (sAMAccountName=pearl). Oct 25 15:40:56 CGSG saslauthd[3746]: Authentication failed for pearl/uc-central.net: User not found (-6) Oct 25 15:40:56 CGSG saslauthd[3746]: : auth failure: [user=pearl] [service=smtp] [realm=uc-central.net] [mech=ldap] [reason=Unknown]
Hi David, Your detail is appreciated. It helps to paint a good picture of what's going on. The errors above appear to be for postfix. An ldap filter to try: ldap_filter: (|(sAMAccountName=%U)(userPrincipalName=%u)) Note that saslauthd does not return the username/auth identity for postfix and cyrus imapd to use. It's only used to authenticate the user. To troubleshoot, you can enable debugging with: ldap_debug: -1 See (3)ldap_set_option and include/ldap_log.h in the openldap source. If you don't see ldap output in syslog, try starting saslauthd in debug mode. The -r option for saslauthdm, which combines the username and realm, may be useful.
Oct 25 13:49:52 CGSG cyrus/imaps[3074]: SASL Password verification failed Oct 25 13:31:25 CGSG cyrus/imap[2420]: badlogin: localhost [127.0.0.1] plaintext i...@mandldreyer.com SASL(-13): authentication failure: checkpass failed Oct 25 13:31:25 CGSG cyrus/imaps[2434]: badlogin: port-83-236-195-74.static.qsc.de[83.236.195.74] LOGIN [SASL(-13): authentication failure: checkpass failed] Oct 25 13:31:25 CGSG cyrus/imaps[2432]: badlogin: port-83-236-195-74.static.qsc.de[83.236.195.74] LOGIN [SASL(-13): authentication failure: checkpass failed] Oct 25 13:31:28 CGSG cyrus/imap[2445]: badlogin: localhost [127.0.0.1] plaintext i...@mandldreyer.com SASL(-13): authentication failure: checkpass failed Oct 25 13:31:29 CGSG cyrus/imaps[2432]: badlogin: port-83-236-195-74.static.qsc.de[83.236.195.74] plaintext lager SASL(-13): authentication failure: checkpass failed Oct 25 13:31:29 CGSG cyrus/imaps[2434]: badlogin: port-83-236-195-74.static.qsc.de[83.236.195.74] plaintext sebastian.ma...@mandldreyer.com SASL(-13): authentication failure: checkpass failed The problem is our multi domain setup and when a user login with a client or over the web with only their username, cyrus create new false mailboxes. This we would like to prevent.
The mapping of username[@domain] to mailbox function is a cyrus imap decision. You can influence this by setting: defaultdomain: <domain> in /etc/imapd.conf. I recommend being cautious with changing following imapd.conf settings on a production system: defaultdomain virtdomains Or you can use a canonicalization plugin.
Perhaps someone know how to configure the saslauthd filter right for this special case. Configuration Our /etc/saslauthd.config ldap_servers: ldap://ddcl001.domain.dir ldap_search_base: dc=domain,dc=dir ldap_filter: sAMAccountName=%U #ldap_filter: userPrincipalName=%u #ldap_version: 3 ldap_auth_method: bind ldap_bind_dn: cn=Administrator,cn=Users,dc=domain,dc=dir ldap_bind_pw: ****** #ldap_scope: sub
If supported on your ldap server, sasl/digest-md5 is a simpler way to go about this: ldap_servers: ldaps://<host> ldap_use_sasl: yes ldap_mech: DIGEST-MD5 -- Dan White
