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ACL.txt
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AixPluginsSupport.txt
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AttachmentIndicator.txt
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AuthDatabase.CheckPassword.txt
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Authentication.Caching.txt
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Authentication.txt
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BasicConfiguration.txt
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Chrooting.txt
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Clients.NegativeUIDs.txt
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Clients.txt
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CompilingSource.txt
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ConfigFile.txt
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Debugging.ProcessTracing.txt
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Debugging.Rawlog.txt
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Design.Arrays.txt
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Design.AuthProcess.txt
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Design.AuthProtocol.txt
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Design.Dcrypt.txt
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Design.Indexes.txt
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Design.Lua.txt
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Design.Memory.txt
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Design.Storage.MailboxList.txt
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Design.Storage.Plugins.txt
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Design.Strings.txt
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Design.txt
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Dict.txt
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Dictionary.txt
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Director.txt
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DomainLost.txt
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Errors.ChgrpNoPerm.txt
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Events.txt
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FindMailLocation.txt
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FinishBasicConfiguration.txt
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HAProxy.txt
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HowTo.AntispamWithSieve.txt
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HowTo.EximAndDovecotSASL.txt
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HowTo.ImapcProxy.txt
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HowTo.SimpleVirtualInstall.txt
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HowTo.WriteConfiguration.txt
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HowTo.txt
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IMAPServer.Hibernation.txt
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IMAPServer.txt
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ImapMetadata.txt
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IndexFiles.txt
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LDA.Exim.txt
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LDA.Indexing.txt
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LDA.Postfix.txt
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LDA.Qmail.txt
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LDA.Sendmail.txt
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LDA.txt
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LMTP.Exim.txt
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LMTP.txt
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Logging.txt
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LoginProcess.txt
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MDA.txt
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MTA.txt
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MailLocation.LocalDisk.txt
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MailLocation.Maildir.txt
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MailLocation.SharedDisk.txt
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MailLocation.dbox.txt
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MailLocation.mbox.txt
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MailLocation.txt
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MailboxFormat.Cydir.txt
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MailboxFormat.MH.txt
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MailboxFormat.Maildir.txt
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MailboxFormat.dbox.txt
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MailboxFormat.imapc.txt
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MailboxFormat.mailstore.txt
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MailboxFormat.mbox.txt
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MailboxFormat.mbx.txt
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MailboxFormat.txt
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MailboxSettings.txt
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MboxChildFolders.txt
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MboxLocking.txt
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MboxProblems.txt
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Migration.BincIMAP.txt
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Migration.Courier.txt
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Migration.Cyrus.txt
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Migration.Dsync.txt
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Migration.Gmail.txt
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Migration.Linuxconf.txt
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Migration.MailFormat.txt
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Migration.Online.txt
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Migration.UW.txt
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Migration.Vm-pop3d.txt
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Migration.txt
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MissingMailboxes.txt
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Mountpoints.txt
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NFS.txt
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POP3Server.txt
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PasswordDatabase.BSDAuth.txt
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PasswordDatabase.PAM.txt
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PasswordDatabase.Shadow.txt
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PasswordDatabase.Static.txt
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PasswordDatabase.oauth2.txt
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PasswordDatabase.txt
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PerformanceTuning.txt
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Pigeonhole.Installation.txt
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Pigeonhole.txt
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Code Editor : Authentication.MasterUsers.txt
Master users/passwords ====================== It's possible to configure master users who are able to log in as other users. It's also possible to directly log in as any user using a master password. Master users ------------ There are two ways for master users to log in as other users: 1. Give the login username in the <SASL mechanism's> [Authentication.Mechanisms.txt] authorization ID field. 2. Specify both the master username and the login username in the same username field. The usernames are separated by a string configured by the 'auth_master_user_separator' setting. UW-IMAP uses "*" as the separator, so that could be a good choice. Using "*" as the separator, the master user would log in as "login_user*master_user". Master users are configured by adding a new <passdb> [PasswordDatabase.txt] with 'master=yes' setting. The users in the master passdb cannot log in as themselves, only as other people. That means they don't need to exist in the <userdb> [UserDatabase.txt], because the userdb lookup is done only for the user they're logging in as. You should also add the 'pass=yes' setting to the master passdb if possible. It means that Dovecot verifies that the login user really exists before allowing the master user to log in. Without the setting if a nonexistent login username is given, depending on the configuration, it could either return an internal login error (the userdb lookup failed) or create a whole new user (with eg. <static userdb> [UserDatabase.Static.txt]). 'pass=yes' doesn't work with PAM or LDAP with 'auth_bind=yes', because both of them require knowing the user's password. 'pass=yes' is especially useful with a <Checkpassword> [PasswordDatabase.CheckPassword.txt] passdb because the script gets both the login and the master username as environment variables. Other passdbs see only the login username in '%u'. In the future there will probably be another setting to make the user verification to be done from userdb. If you want master users to be able to log in as themselves, you'll need to either add the user to the normal passdb or add the passdb to 'dovecot.conf' twice, with and without 'master=yes'. Note that if the passdbs point to different locations, the user can have a different password when logging in as other users than when logging in as himself. This is a good idea since it can avoid accidentally logging in as someone else. Usually it's better to have only a few special master users that are used *only* to log in as other people. One example could be a special "spam" master user that trains the users' spam filters by reading the messages from the user's spam mailbox. ACLs ---- If <ACL.txt> plugin is enabled, the Master user is still subject to ACLs just like any other user, which means that by default the master user has no access to any mailboxes of the user. The options for handling this are: 1. Adding a global <ACL.txt> for the master user. You can create a "default ACL", that applies to all mailboxes. See example below. 2. Set 'plugin { acl_user=%u } ' This preserves the master_user for other purposes (e.g. %{master_user} variable). 3. Set 'plugin { master_user=%u } ' This fully hides that master user login is being used. Example configuration --------------------- ---%<------------------------------------------------------------------------- auth_master_user_separator = * passdb { driver = passwd-file args = /etc/dovecot/passwd.masterusers master = yes pass = yes } passdb { driver = shadow } userdb { driver = passwd } ---%<------------------------------------------------------------------------- To grant the masteruser access to all Mailboxes, the 'dovecot-acl' file can contain: ---%<------------------------------------------------------------------------- * user=masteruser lr ---%<------------------------------------------------------------------------- Where the 'passwd.masterusers' file would contain the master usernames and passwords: ---%<------------------------------------------------------------------------- admin:{SHA1}nU4eI71bcnBGqeO0t9tXvY1u5oQ= admin2:{SHA1}i+UhJqb95FCnFio2UdWJu1HpV50= ---%<------------------------------------------------------------------------- One way to create this master file is to use the htaccess program as follows: ---%<------------------------------------------------------------------------- htpasswd -b -c -s passwd.masterusers user password ---%<------------------------------------------------------------------------- SQL Example ----------- The master passdb doesn't have to be passwd-file, it could be an SQL query as well: ---%<------------------------------------------------------------------------- auth_master_user_separator = * passdb { driver = sql args = /etc/dovecot/dovecot-sql-master.conf.ext master = yes pass = yes } passdb { driver = sql args = /etc/dovecot/dovecot-sql.conf.ext } userdb { driver = sql args = /etc/dovecot/dovecot-sql.conf.ext } } ---%<------------------------------------------------------------------------- 'dovecot-sql-master.conf.ext' would contain all the normal connection settings and a 'password_query': ---%<------------------------------------------------------------------------- password_query = SELECT password FROM users WHERE userid = '%u' and master_user = true ---%<------------------------------------------------------------------------- Testing ------- ---%<------------------------------------------------------------------------- # telnet localhost 143 * OK Dovecot ready. 1 login loginuser*masteruser masterpass 1 OK Logged in. ---%<------------------------------------------------------------------------- If you had any problems, set 'auth_debug=yes' and look at the logs. Master passwords ---------------- You can configure a passdb which first performs authentication using the master password. Then it continues to the primary passdb to verify that the user exists and get other extra fields. ---%<------------------------------------------------------------------------- # master password passdb passdb { driver = static default_fields = password=master-password result_success = continue } # primary passdb passdb { driver = pam } ---%<------------------------------------------------------------------------- Advanced SQL Examples --------------------- In these example we will create 3 kinds of master users. The first will be users who can read all email for all domains. The next example will be users who can read all email for their domain only. The third example will be users who can read email of domains listed in a separate ownership table. We will use MySQL and create 2 tables with the following structure. ---%<------------------------------------------------------------------------- CREATE TABLE `users` ( `uid` int(4) NOT NULL AUTO_INCREMENT, `user_name` varchar(80) NOT NULL, `domain_name` varchar(80) NOT NULL, `password` varchar(60) DEFAULT NULL, `last_login` datetime DEFAULT NULL, `masteradmin` tinyint(1) NOT NULL DEFAULT '0', `owns_domain` tinyint(1) NOT NULL DEFAULT '0', UNIQUE KEY `emaillookup` (`domain_name`,`user_name`), UNIQUE KEY `uid` (`uid`) ) ENGINE=MyISAM AUTO_INCREMENT=995 DEFAULT CHARSET=latin CREATE TABLE `ownership` ( `login_id` varchar(128) NOT NULL, `owned_object` varchar(128) NOT NULL, UNIQUE KEY `login_id_full` (`login_id`,`owned_object`), KEY `login_id` (`login_id`), KEY `owned_object` (`owned_object`), KEY `login_id_index` (`login_id`), KEY `owned_object_index` (`owned_object`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 ---%<------------------------------------------------------------------------- The dovecot.conf file for all 3 master user configurations will be as follows: ---%<------------------------------------------------------------------------- passdb { driver = sql args = /etc/dovecot/ownership-sql.conf master = yes pass = yes } passdb { driver = sql args = /etc/dovecot/domain-owner-sql.conf master = yes pass = yes } passdb { driver = sql args = /etc/dovecot/masteradmin-sql.conf master = yes pass = yes } passdb { args = /etc/dovecot/sql.conf driver = sql } ---%<------------------------------------------------------------------------- Before we get into the master user tricks, we start with normal email authentication. The query for that is as follows: ---%<------------------------------------------------------------------------- password_query = SELECT user_name, domain_name, password FROM users WHERE user_name = '%n' AND domain_name = '%d' ---%<------------------------------------------------------------------------- In this first example master admin suppose you want to allow a few people to be master users over all domains. These users will have the "masteradmin" field set to 1. The query would be: ---%<------------------------------------------------------------------------- password_query = SELECT user_name, domain_name, password FROM users WHERE user_name = '%n' AND domain_name = '%d' AND masteradmin='1' ---%<------------------------------------------------------------------------- In the second example suppose you are hosting multiple domains and you want to allow a few users to become master users of their domain only. Your query would be as follows: ---%<------------------------------------------------------------------------- password_query = SELECT user_name, domain_name, password FROM users WHERE user_name = '%n' \ AND domain_name = '%d' AND owns_domain='1' AND '%d'='%{login_domain}' ---%<------------------------------------------------------------------------- This will allow you to log in using the following to read Joe's email if master@dovecot.org is flagged as the domain_owner. ---%<------------------------------------------------------------------------- joe@dovecot.org*master@dovecot.org ---%<------------------------------------------------------------------------- In this third example we have a table of owners. There are a list of pairs between owner email addresses and domains that are owned. That way if a person controls a lot of domains then they can view all the users in all the domains they control. The query would be as follows: ---%<------------------------------------------------------------------------- password_query = SELECT user_name, domain_name, password FROM users, ownership WHERE \ user_name = '%n' AND domain_name = '%d' AND login_id='%u' AND owned_object='%{login_domain}' ---%<------------------------------------------------------------------------- If you really want to get tricky and efficient you can combine all 3 queries into one giant query that does everything. ---%<------------------------------------------------------------------------- password_query = SELECT user_name, domain_name, password FROM users, ownership WHERE \ user_name = '%n' AND domain_name = '%d' AND ( \ (masteradmin='1') OR \ (owns_domain='1' AND '%d'='%{login_domain}') OR \ (login_id='%u' and owned_object='%{login_domain}')) \ group by uid ---%<------------------------------------------------------------------------- (This file was created from the wiki on 2019-06-19 12:42)
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