Apache Module mod_authz_dbm
This module provides authorization capabilities so that authenticated users can be allowed or denied access to portions of the web site by group membership. Similar functionality is provided by
directives are used during the authorization phase to ensure that a user is allowed to access a resource. modauthzdbm extends the authorization types with Requiredbm-group
Since v2.4.8, expressions are supported within the DBM require directives.
This directive specifies group membership that is required for the user to gain access.
When this directive is specified, the user must be a member of the group assigned to the file being accessed.
Note that using modauthzdbm requires you to require dbm-group instead of group:
The group file is keyed on the username. The value for a user is a comma-separated list of the groups to which the users belongs. There must be no whitespace within the value, and it must never contain any colons.
Make sure that the AuthDBMGroupFile
is stored outside the document tree of the web-server. Do not put it in the directory that it protects. Otherwise, clients will be able to download the AuthDBMGroupFile
Combining Group and Password DBM files: In some cases it is easier to manage a single database which contains both the password and group details for each user. This simplifies any support programs that need to be written: they now only have to deal with writing to and locking a single DBM file. This can be accomplished by first setting the group and password files to point to the same DBM:
AuthDBMGroupFile /www/userbase AuthDBMUserFile /www/userbase
Encrypted Password : List of Groups [ : (ignored) ]
The password section contains the encrypted password as before. This is followed by a colon and the comma separated list of groups. Other data may optionally be left in the DBM file after another colon; it is ignored by the authorization module. This is what www.telescope.org uses for its combined password and group database.
AuthzDBMType default|SDBM|GDBM|NDBM|DB
It is crucial that whatever program you use to create your group files is configured to use the same type of database.
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Apache HTTP Server Version 2.4
Apache Module mod_authz_dbm
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The Require Directives
Apache's Require directives are used during the authorization phase to ensure that a user is allowed to access a resource. mod_authz_dbm extends the authorization types with dbm-group.
AuthDBMGroupFile Directive
The AuthDBMGroupFile directive sets the name of a DBM file containing the list of user groups for user authorization. File-path is the absolute path to the group file.
AuthzDBMType Directive
Sets the type of database file that is used to store the list of user groups. The default database type is determined at compile time. The availability of other types of database files also depends on compile-time settings.