Apache HTTP Server Version 2.2
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Apache HTTP Server Version 2.2
Available Languages: en
| Description: | User authentication using an SQL database |
|---|---|
| Status: | Extension |
| Module Identifier: | authn_dbd_module |
| Source File: | mod_authn_dbd.c |
| Compatibility: | Available in Apache 2.1 and later |
This module provides authentication front-ends such as
mod_auth_digest and mod_auth_basic
to authenticate users by looking up users in SQL tables.
Similar functionality is provided by, for example,
mod_authn_file.
This module relies on mod_dbd to specify
the backend database driver and connection parameters, and
manage the database connections.
When using mod_auth_basic or
mod_auth_digest, this module is invoked via the
AuthBasicProvider or
AuthDigestProvider
with the dbd value.
This simple example shows use of this module in the context of
the Authentication and DBD frameworks. Please note that you need
to load an authorization module, such as mod_authz_user,
to get it working.
# mod_dbd configuration
DBDriver pgsql
DBDParams "dbname=apacheauth user=apache password=xxxxxx"
DBDMin 4
DBDKeep 8
DBDMax 20
DBDExptime 300
<Directory /usr/www/myhost/private>
# core authentication and mod_auth_basic configuration
# for mod_authn_dbd
AuthType Basic
AuthName "My Server"
AuthBasicProvider dbd
# core authorization configuration
Require valid-user
# mod_authn_dbd SQL query to authenticate a user
AuthDBDUserPWQuery \
"SELECT password FROM authn WHERE user = %s"
</Directory>
If httpd was built against APR version 1.3.0 or higher, then whenever a query is made to the database server, all column values in the first row returned by the query are placed in the environment, using environment variables with the prefix "AUTHENTICATE_".
If a database query for example returned the username, full name and telephone number of a user, a CGI program will have access to this information without the need to make a second independent database query to gather this additional information.
This has the potential to dramatically simplify the coding and configuration required in some web applications.
| Description: | SQL query to look up a password for a user |
|---|---|
| Syntax: | AuthDBDUserPWQuery query |
| Context: | directory |
| Status: | Extension |
| Module: | mod_authn_dbd |
The AuthDBDUserPWQuery specifies an
SQL query to look up a password for a specified user. The user's ID
will be passed as a single string parameter when the SQL query is
executed. It may be referenced within the query statement using
a %s format specifier.
AuthDBDUserPWQuery \ "SELECT password FROM authn WHERE user = %s"
The first column value of the first row returned by the query
statement should be a string containing the encrypted password.
Subsequent rows will be ignored. If no rows are returned, the user
will not be authenticated through mod_authn_dbd.
If httpd was built against APR version 1.3.0
or higher, any additional column values in the first row returned by
the query statement will be stored as environment variables with
names of the form AUTHENTICATE_COLUMN.
The encrypted password format depends on which authentication
frontend (e.g. mod_auth_basic or
mod_auth_digest) is being used. See Password Formats for
more information.
| Description: | SQL query to look up a password hash for a user and realm. |
|---|---|
| Syntax: | AuthDBDUserRealmQuery query |
| Context: | directory |
| Status: | Extension |
| Module: | mod_authn_dbd |
The AuthDBDUserRealmQuery specifies an
SQL query to look up a password for a specified user and realm in a
digest authentication process.
The user's ID and the realm, in that order, will be passed as string
parameters when the SQL query is executed. They may be referenced
within the query statement using %s format specifiers.
AuthDBDUserRealmQuery \ "SELECT password FROM authn WHERE user = %s AND realm = %s"
The first column value of the first row returned by the query
statement should be a string containing the encrypted password.
Subsequent rows will be ignored. If no rows are returned, the user
will not be authenticated through mod_authn_dbd.
If httpd was built against APR version 1.3.0
or higher, any additional column values in the first row returned by
the query statement will be stored as environment variables with
names of the form AUTHENTICATE_COLUMN.
The encrypted password format depends on which authentication
frontend (e.g. mod_auth_basic or
mod_auth_digest) is being used. See Password Formats for
more information.
Available Languages: en