Re: using %d as a variable in the ldap search base

On Tue, Sep 01, 2020 at 03:03:34PM +0200, Marc Roos wrote:

If you already tested %d in the ou of the auth user bind, and it is not working. I guess you are just left with options like

1. 3 different vm's
2. auth bind = no base, scope subtree that is parent of those 3 ou's and then apply filters something like pass_filter = (&(objectClass=posixAccount)(uid=%n)(ou:dn:=%d))

It seems that at least some (perhaps most?) LDAP server implementations do not allow this. Filtering on an OU is not allowed in an ldap query by either active directory or fedora's 389-ds. I'm not sure about openldap. I'm currently using fedora's 389-ds.

3. investigate if nslcd(/ssss?) has an option to use multiple queries for passwd and have dovecot authenticate against the system.

This is what I'm doing as a work around while I pursue figuring out why binding to ldap directly doesn't work. SSSD is having no problem with the domain substitution, but every once in a while the SSSD/PAM integration acts up and I hate debugging PAM. I can of course continue this route, but I shouldn't have to. Dovecot's documentation says it should be able to do this. Is there any debugging information I can provide to help drive this towards a resolution instead of being resigned to broken software?

Thanks!

Luke

-----Original Message----- Cc: dovecot; luke-dovecot Subject: Re: using %d as a variable in the ldap search base

I'm trying to use auth bind to avoid having a plain text password in a config file. With %u instead of %n, the @domain part of the login ends up in the uid field of the search filter. As I said, my OUs have overlapping users, so I have configured things such that the users are logging in with user@domain, and need to get the domain component into the search base as you cannot filter on an Organizational Unit in an ldap filter. If I have a single search base, it will return multiple users for those %ns that overlap. If I use %u, it will return no users for any account, because the uids do not have the @domain in them. I tried both ways.

Luke

On Mon, Aug 31, 2020 at 09:45:17PM +0200, Marc Roos wrote:

...

You have two ways of authenticating against ldap. I decided to use the

...

method where a single account has access to the user credentials. (Advantage of this method, you can limit ldap lookups eg do not have to do 2nd for the userdb)

debug_level = 1 uris = ldaps://ldap.local:8443 dn = cn=aaaa,cn=bbbbb,ou=ccccc,dc=dddd,dc=eeee,dc=local dnpass = xxxx base = ou=asdfadsfa,ou=hhhh,ou=ggg,dc=fffff,dc=eeee,dc=local scope = subtree

user_filter = (&(objectClass=posixAccount)(uid=%u) pass_attrs = uid=user,userPassword=password,host=host,homeDirectory=userdb_home,uid Nu mber=userdb_uid,gidNumber=userdb_gid

However I did not have any issues authenticating against ldap with yours also. But using the %u

-----Original Message----- From: Luke Schierer [mailto:luke-dovecot@schierer.org] Sent: maandag 31 augustus 2020 21:32 To: dovecot@dovecot.org Subject: using %d as a variable in the ldap search base

Hi,

I'm trying to configure dovecot to use LDAP authentication directly, and I'm having a bit of trouble. I have a somewhat unusual setup, in that I have an LDAP directory that has 3 OUs each of which have their own set of users, some of which overlap. As I was trying to figure things out, I was setting the search base in my /etc/dovecot/dovecot-ldap.conf.ext file which is referenced by /etc/dovecot/conf.d/auth-ldap.conf.ext
file to

base = ou=%d,dc=thecrazyguys,dc=net

however, the resulting searches against the directory endup just dropping the %d, resulting in

ou=,dc=thecrazyguys,dc=net

which is invalid. On a whim, I tried a search base of

base = dc=%d,dc=thecrazyguys,dc=net

and found that it did correctly substitute in the variable, which would be correct, except that my ldap tree is set up with OUs and not an extra DC segment.

for whatever reason, it will do variable substitution for dc=%d, but not for ou=%d. this is certainly not documented, and seems like wrong behavior, since having an ou in a search base is valid.

I'm including configuration information below. Please let me know if I've missed including information that is required.

Thanks! Luke

luke@schierer@littera001:/etc/dovecot$ lsb_release -rd Description: Ubuntu 18.04.5 LTS Release: 18.04 luke@schierer@littera001:/etc/dovecot$

luke@schierer@littera001:/etc/dovecot$ dpkg -l | grep -i dovecot ii dovecot-core 1:2.2.33.2-1ubuntu4.6 amd64 ii dovecot-imapd 1:2.2.33.2-1ubuntu4.6 amd64 ii dovecot-ldap 1:2.2.33.2-1ubuntu4.6 amd64 ii dovecot-pop3d 1:2.2.33.2-1ubuntu4.6 amd64 luke@schierer@littera001:/etc/dovecot$

root@littera001:/etc/dovecot# dovecot -n # 2.2.33.2 (d6601f4ec): /etc/dovecot/dovecot.conf # Pigeonhole version 0.4.21 (92477967) # OS:

...

Linux 4.15.0-112-generic x86_64 Ubuntu 18.04.5 LTS auth_verbose = yes first_valid_uid = 1001 imap_hibernate_timeout = 100 secs lock_method =

...

dotlock mail_cache_min_mail_count = 15 mail_fsync = always mail_location = maildir:~/Maildir:LAYOUT=fs:INDEX=MEMORY mail_nfs_index = yes mail_nfs_storage = yes mail_privileged_group = mail mailbox_list_index = yes maildir_broken_filename_sizes = yes maildir_very_dirty_syncs = yes mbox_min_index_size = 10 B mmap_disable = yes namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = separator = / } passdb { args = /etc/dovecot/dovecot-ldap.conf.ext driver = ldap } protocols = " imap pop3" ssl_cert = </etc/dovecot/dovecot.pem ssl_key = # hidden, use -P to show it userdb { args = /etc/dovecot/dovecot-ldap.conf.ext driver = ldap } protocol imap { mail_max_userip_connections = 20 } root@littera001:/etc/dovecot#

root@littera001:/etc/dovecot# cat /etc/dovecot/dovecot-ldap.conf.ext |

...

grep -v ^# | uniq | more

hosts = censor001.plerumque.thecrazyguys.net

tls = yes tls_require_cert = allow

debug_level = 4

auth_bind = yes

base = ou=%d,dc=thecrazyguys,dc=net

scope = subtree

user_attrs = homeDirectory=home,uidNumber=uid,gidNumber=gid

user_filter = (&(objectClass=posixAccount)(uid=%n))

blocking = no root@littera001:/etc/dovecot#