← Revision 30 as of 2019-09-11 14:02:20
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|= Password database extra fields =
The primary purpose of a password database lookup is to return the password for a given user. It may however also return other fields which are treated specially:
* '''[[PasswordDatabase/ExtraFields/User|user]]''': Change the username (eg. lowercase it).
* '''login_user''': Master passdb can use this to change the username. (v2.2.13+)
* '''[[PasswordDatabase/ExtraFields/AllowNets|allow_nets]]''': Allow user to log in from only specified IPs (checks against remote IP).
* '''allow_real_nets''': Allow user to log in from only specified IPs (checks against ''real'' remote IP).
* '''[[PasswordDatabase/ExtraFields/Proxy|proxy and proxy_maybe]]''': Proxy the connection to another IMAP/POP3 server.
* '''[[PasswordDatabase/ExtraFields/Host|host]]''': Send login referral to client (if proxy=y field isn't set).
* '''[[PasswordDatabase/ExtraFields/NoLogin|nologin]]''': User isn't actually allowed to log in even if the password matches, with optionally a different reason given as the authentication failure message.
* '''[[PasswordDatabase/ExtraFields/NoDelay|nodelay]]''': Don't delay reply to client in case of an authentication failure.
* '''nopassword''': If you want to allow all passwords, use an empty password and this field.
* '''fail''': If set, explicitly fails the passdb lookup. (v2.2.22+)
* '''k5principals''': if using "auth_mechanisms = gssapi", may contain Kerberos v5 principals allowed to map to the current user, bypassing the internal call to krb5_kuserok(). The database must support credentials lookup. (v2.2+)
* '''delay_until''': Delay login until this time (value = timestamp). (v2.2.25+)
How to return these extra fields depends on the password database you use. See the [[PasswordDatabase|password database]] pages on how to do it. Some passdbs however don't support returning them at all, such as [[PasswordDatabase/PAM|PAM]].
The password database may also return fields prefixed with `userdb_`. These fields are only saved and used later as if they came from the [[UserDatabase|user database]]'s extra fields. Typically this is done only when using [[UserDatabase/Prefetch|prefetch userdb]].
Note that boolean fields are true always if the field exists. So `nodelay`, `nodelay=yes`, `nodelay=no` and `nodelay=0` all mean that the nodelay field is true. With SQL the field is considered to be non-existent if its value is NULL.
The following suffixes added to a field name are handled specially:
* ''':protected''': Set this field only if it hasn't been set before.
* ''':remove''': Remove this field entirely.
== Examples ==
=== SQL ===
password_query = SELECT userid as user, password, 'Y' as proxy, host \
FROM users WHERE userid = '%u'
=== LDAP ===
pass_attrs = \
Note about the "proxy", "proxy_maybe" and any other boolean type fields: these represent an existence test. Currently this translates to "will proxy (or proxy_maybe) if this attribute exists". This allows the proxy behaviour to be selectable per user. To have it "always" on, use a template, e.g.:
pass_attrs = \
=== passwd-file ===
|Moved to https://doc.dovecot.org/configuration_manual/authentication/password_database_extra_fields/|