On ke, 10 loka 2018, Winfried de Heiden via FreeIPA-users wrote:
Hi all,
The Red Hat manual is not too clear about this
(https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html-single/linux_domain_identity_authentication_and_policy_guide/#users)
IdM supports user names that can be described by the following regular
expression:
[a-zA-Z0-9_.][a-zA-Z0-9_.-]{0,252}[a-zA-Z0-9_.$-]?
Note
User names ending with the trailing dollar sign ($) are supported to
enable Samba 3.x machine support.
If you add a user whose user name contains uppercase characters, IdM
automatically converts the name to lowercase when saving it.
Therefore, IdM always requires users to enter their user names all
lowercase when logging in. Additionally, it is not possible to add
users whose user names only differ in letter casing, such as user and
User.
Having co-workers from different countries using different languages
we want to avoid "strange" character from Cyrilic, German, Hindoi etc.
etc.
Reading the docs, it suggest only plain UTF ASCII is supported, no
"strange" characters. Correct? Or else: how to avoid/not allow non
standard ASCII usernames?
ASCII, not UTF(-8). See a good presentation by Paul Gorman on the topic:
https://paulgorman.org/technical/presentations/linux_username_conventions.pdf
While we can store UTF-8 in 'uid' attribute in LDAP, POSIX systems are
what practically limits us here.
--
/ Alexander Bokovoy
Sr. Principal Software Engineer
Security / Identity Management Engineering
Red Hat Limited, Finland
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