Apache module mod_auth
Apache HTTP Server Version 1.3
Module mod_auth
This module provides for user authentication using text files.
Status: Base
Source File: mod_auth.c
Module Identifier: auth_module
Summary
This module allows the use of HTTP Basic Authentication to restrict
access by looking up users in plain text password and group files.
Similar functionality and greater scalability is provided by mod_auth_dbm and mod_auth_db. HTTP Digest Authentication
is provided by mod_auth_digest.
Directives
AuthGroupFile
AuthUserFile
AuthAuthoritative
See also: require
and satisfy.
AuthGroupFile directive
Syntax: AuthGroupFile filename
Context: directory, .htaccess
Override: AuthConfig
Status: Base
Module: mod_auth
The AuthGroupFile directive sets the name of a textual file containing the list
of user groups for user authentication. Filename is the path
to the group file. If it is not absolute (i.e., if it
doesn't begin with a slash), it is treated as relative to the ServerRoot.
Each line of the group file contains a groupname followed by a colon, followed
by the member usernames separated by spaces. Example:
mygroup: bob joe anne
Note that searching large text files is very inefficient;
AuthDBMGroupFile should
be used instead.
Security: make sure that the AuthGroupFile 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 AuthGroupFile.
See also AuthName,
AuthType and
AuthUserFile.
AuthUserFile directive
Syntax: AuthUserFile filename
Context: directory, .htaccess
Override: AuthConfig
Status: Base
Module: mod_auth
The AuthUserFile directive sets the name of a textual file containing
the list of users and passwords for user
authentication. Filename is the path to the user
file. If it is not absolute (i.e., if it doesn't begin with a
slash), it is treated as relative to the ServerRoot.
Each line of the user file file contains a username followed
by a colon, followed by the crypt() encrypted password. The behavior
of multiple occurrences of the same user is undefined.
The utility htpasswd which is installed as part of the
binary distribution, or which can be found in src/support,
is used to maintain this password file. See the man
page for more details. In short
htpasswd -c Filename username
Create a password file 'Filename' with 'username'
as the initial ID. It will prompt for the password.
htpasswd Filename username2
Adds or modifies in password file 'Filename' the 'username'.
Note that
searching large text files is very inefficient;
AuthDBMUserFile should be
used instead.
Security: make sure that the AuthUserFile 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 AuthUserFile.
See also AuthName,
AuthType and
AuthGroupFile.
AuthAuthoritative directive
Syntax: AuthAuthoritative on|off
Default: AuthAuthoritative on
Context: directory, .htaccess
Override: AuthConfig
Status: Base
Module: mod_auth
Setting the AuthAuthoritative directive explicitly to 'off'
allows for both authentication and authorization to be passed on to
lower level modules (as defined in the Configuration and
modules.c files) if there is no userID or
rule matching the supplied userID. If there is a userID and/or
rule specified; the usual password and access checks will be applied
and a failure will give an Authorization Required reply.
So if a userID appears in the database of more than one module; or if
a valid Require directive applies to more than one module; then the
first module will verify the credentials; and no access is passed on;
regardless of the AuthAuthoritative setting.
A common use for this is in conjunction with one of the database
modules; such as mod_auth_db.c, mod_auth_dbm.c,
mod_auth_msql.c, and mod_auth_anon.c. These modules
supply the bulk of the user credential checking; but a few
(administrator) related accesses fall through to a lower level with a
well protected AuthUserFile.
Default: By default; control is not passed on; and an
unknown
userID or rule will result in an Authorization Required reply. Not
setting it thus keeps the system secure; and forces an NCSA compliant
behaviour.
Security: Do consider the implications of allowing a user to allow
fall-through in his .htaccess file; and verify that this is really
what you want; Generally it is easier to just secure a single
.htpasswd file, than it is to secure a database such as mSQL. Make
sure that the AuthUserFile 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
AuthUserFile.
See also AuthName,
AuthType and
AuthGroupFile.
Apache HTTP Server Version 1.3
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