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Editing: PasswordDatabase.ExtraFields.txt
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: * * <user> [PasswordDatabase.ExtraFields.User.txt]*: Change the username (eg. lowercase it). * *login_user*: Master passdb can use this to change the username. (v2.2.13+) * * <allow_nets> [PasswordDatabase.ExtraFields.AllowNets.txt]*: Allow user to log in from only specified IPs (checks against remote client IP). * *allow_real_nets*: Allow user's network connection to log in from only specified IPs (checks against /real/ remote IP, e.g. a Dovecot proxy). * * <proxy and proxy_maybe> [PasswordDatabase.ExtraFields.Proxy.txt]*: Proxy the connection to another IMAP/POP3 server. * * <host> [PasswordDatabase.ExtraFields.Host.txt]*: Send login referral to client (if proxy=y field isn't set). * * <nologin> [PasswordDatabase.ExtraFields.NoLogin.txt]*: User isn't actually allowed to log in even if the password matches, with optionally a different reason given as the authentication failure message. * * <nodelay> [PasswordDatabase.ExtraFields.NoDelay.txt]*: 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*=<UNIX timestamp>[+<max random secs>]: Delay login until this time. The timestamp must be less than 5 minutes into future or the login will fail with internal error. The extra random seconds can be used to avoid a load spike of everybody getting logged in at exactly the same time. (v2.2.25+) * *noauthenticate*: Do not perform any authentication, just store extra fields if user is found. (v2.2.26+/v2.3) * *forward_<anything>*: In proxy/director, pass the variable to next hop as forward_<anything>. (v2.2.29+/v2.3) How to return these extra fields depends on the password database you use. See the <password database> [PasswordDatabase.txt] pages on how to do it. Some passdbs however don't support returning them at all, such as <PAM> [PasswordDatabase.PAM.txt]. The password database may also return fields prefixed with 'userdb_'. These fields are only saved and used later as if they came from the <user database> [UserDatabase.txt]'s extra fields. Typically this is done only when using <prefetch userdb> [UserDatabase.Prefetch.txt]. 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 --- *dovecot-sql.conf.ext*: ---%<------------------------------------------------------------------------- password_query = SELECT userid as user, password, 'Y' as proxy, host \ FROM users WHERE userid = '%u' ---%<------------------------------------------------------------------------- LDAP ---- *dovecot-ldap.conf*: ---%<------------------------------------------------------------------------- pass_attrs = \ =user=%{ldap:user}, \ =password=%{ldap:userPassword}, =proxy=%{ldap:proxyEnabled}, \ =host=%{ldap:hostName} ---%<------------------------------------------------------------------------- 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 = \ =user=%{ldap:user}, \ =password=%{ldap:userPassword}, =proxy=y, \ =host=%{ldap:hostName} ---%<------------------------------------------------------------------------- passwd-file ----------- ---%<------------------------------------------------------------------------- user:{plain}pass::::::proxy=y host=127.0.0.1 ---%<------------------------------------------------------------------------- (This file was created from the wiki on 2019-06-19 12:42)
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