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The AuthDbmGroupFile directive sets the fully qualified pathname of the group file that contains the list of user groups Each record in the file is a key=value pair, in
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which the key is the username and the value is a comma-separated list of group names to which the user belongs Syntax: AuthDBMGroupFile filename Context: Directory, per-directory access control file (htaccess) Override: AuthConfig If you prefer not to use a separate group file, you can use a single DBM file to provide both password and group information The format of the file is as follows:
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DBM_Record_Key{username} = encrypted_password: comma_separated_group_list
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Here, the username is the key, and the password and group lists are two fields of the value Other data may be left in the DBM file after another colon, if desired; it is ignored by the authentication module If you use a single DBM to provide both group and password information, you have to point both AuthDBMGroup and AuthDBMUserFile directives to the same file
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AuthDBMAuthoritative
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When using multiple authentication schemes such as mod_dbm and standard mod_auth in the same directory, you can use the AuthDbmGroupFile directive to define whether mod_auth_dbm is the authoritative authentication scheme Syntax: AuthDBMAuthoritative
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Default setting: AuthDBMAuthoritative On Context: Directory, per-directory access control file (htaccess) Override: AuthConfig The default value of the directive enables mod_auth_dbm to become the authoritative authentication for the directory Thus, if the DBM-based authentication fails for a particular user, the user s credentials are not passed on to a lower-level authentication scheme When set to the off value, the credentials of a failed authentication are passed on to the next authentication level
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A common use for this module is in conjunction with one of the basic auth modules, such as mod_authc Whereas this DBM module supplies the bulk of the user credential checking, a few (administrator) related accesses fall through to a lower level with a well-protected htpasswd file
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Now lets take a look at an example of how you can use a DBM based username and passwordAssuming you have the user DBM file created, you are now capable of restricting access to any Web directory you want In the following example, I assume that the user DBM file is /www/secrets/myuserdbm You can add the authentication scheme to your global or virtual server using a <Directory> container, or you can use the htaccess file there is no difference The example configuration looks like this:
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AuthName Apache Server Bible Readers Only AuthType Basic AuthUserDBMFile /www/secrets/myuserdbm require valid-user
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Now Apache uses the mod_auth_dbm module for authentication in the directory where this configuration applies
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Make sure that only Apache and the owner can read the DBM file No one but the owner of the DBM file should be able to write to it
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If your system is not capable of using DBM, but Berkeley DB file support is available, you can use mod_auth_db to use DB files instead of the DBM modules for Apache This module is not compiled in the standard Apache distribution Before configuring Apache with DB file based authentication module, make sure you know where the DB library files are stored on your system For example, on a Linux system, the files are in the standard /usr/lib directory If your system does not have the DB libraries, you will have to get the source code and compile DB support first You can find DB library information at wwwsleepycatcom After you have made sure that your system has DB libraries, you can proceed with reconfiguring and recompiling Apache Use the --enable-db option with configure script to configure the Apache source for Berkeley DB support, and then compile and install Apache as usual At this point, you are ready to use the mod_auth_db module This mod_auth_db module provides the AuthDBUserFile, AuthDBGroupFile, and AuthDBAuthoritative directives
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