Why on earth would you assign a numeric value to a uid? Just do a ldapmodify and replace the uid with a valid userid (eg. jsmith) and replace uidNumber with the previous value, then get rid of the: ldap_user_uid_number = uid ldap_user_gid_number = uid stuff, you can do this in one ldif with

dn: uid=123456,ou=people,dc=example,dc=com changetype: modify replace uid, uidNumber uid: jsmith uidNumber: 123456 - dn: uid=123458,ou=people,dc=example,dc=com changetype: modify replace uid, uidNumber uid: foobar uidNumber: 123458 - (just keep going I'd do an export and work from that)

On March 10, 2020 at 9:30 PM Michael Lake Mike.Lake@uts.edu.au wrote:

Example user:

uid: 123456
mail: Mike.Lake@uts.edu.au mailto:Mike.Lake@uts.edu.au
uidNumber: 200123456

________________________________________
From: patrick.hush@comcast.net mailto:patrick.hush@comcast.net <patrick.hush@comcast.net>
Sent: Wednesday, March 11, 2020 9:15 AM
To: End-user discussions about the System Security Services Daemon
Subject: [SSSD-users] Re: Can I map an LDAP value of 123456 to a user name of u123456 ?

In LDAP what are the uidNumber and uid attributes for a sample user?
On March 10, 2020 at 2:45 PM Michael Lake <Mike.Lake@uts.edu.au> wrote:

Hi

But I'd still have the problem that my UNIX username needs to be POSIX compliant. So if my number is 123456 and my email is Mike.Lake@uts.edu.au<mailto:Mike.Lake@uts.edu.au> I dont want the actual UNIX username to be an email address with an @ in it. Complicates all sorts of scripts. A username of u123456 is simple.
Hence being able to just set that using sssd would be simplest if it can be done.
Slightly more hassle is getting the LDAP changed or a writing a PAM module so change the login.

Hence I'd ask if there is something simpler first.

Mike
________________________________________
From: Pavel Březina <pbrezina@redhat.com>
Sent: Wednesday, March 11, 2020 2:31 AM
To: Michael Lake; End-user discussions about the System Security Services Daemon
Subject: Re: [SSSD-users] Can I map an LDAP value of 123456 to a user name of u123456 ?

On 3/10/20 1:53 PM, Michael Lake wrote:
> Pavel suggested:
> > How about using fully qualified names instead?
>
> I'm not very familiar with LDAP. I'm not sure what that would actually
> look like.
>
> What we have now is where users login to a terminal using their number.
> However with web based logins they do use their email address.
>
> I'd have to check tomorrow in the LDAP and check what a fully qualified
> name actually is.

Fully qualified name is a name in the form of user@domain. I.e. if you
have [domain/mydomain] in /etc/sssd/sssd.conf the fully qualified name
will be number@mydomain.

If they are used to login with their email address, you could also
switch name attribute to the email address attribute if it is in LDAP.

See ldap_user_name in `man sssd-ldap` and use_fully_qualified_names and
full_name_format in `man sssd.conf`.

> Mike
>
> ________________________________________
> From: Pavel Březina <pbrezina@redhat.com>
> Sent: Tuesday, March 10, 2020 11:33 PM
> To: End-user discussions about the System Security Services Daemon;
> Michael Lake
> Subject: Re: [SSSD-users] Can I map an LDAP value of 123456 to a user
> name of u123456 ?
>
> On 3/10/20 5:11 AM, Michael Lake wrote:
> > Hi all
> >
> > I am currently authenticating users with Centos 6 and sssd to an LDAP
> > server. I'll be moving to a Centos 8 so have setup sssd to authenticate
> > to the LDAP server on my test Centos 8 box. However, our users in our
> > LDAP only contains all numeric identifiers for users. Centos 8 no longer
> > accepts all numeric user names and group names
> >
> > Currently my sssd.conf contains:
> >
> > ldap_user_uid_number = uid
> > ldap_user_gid_number = uid
> > override_homedir = /homes/%u
> >
> > Our LDAP server contains "uid" values for users like "123456"
> >
> > I'll still be able to use the LDAP "uid" for UNIX uid and gid but what
> > I would like to be able to do is have the user name (and group name)
> > created by prefixing the LDAP "uid" values with a literal "u" to make
> > them POSIX compliant.
> >
> > Hence a user 123456 with "uid" of 123456 in LDAP can login and end up
> > with a username of "u123456".
> > I can't see a way to do that with a simple template in the "man
> > ssd.conf"
>
> How about using fully qualified names instead?
>
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