NAME
rlm_pap - FreeRADIUS Module
DESCRIPTION
The rlm_pap module authenticates RADIUS Access-Request packets that
contain a User-Password attribute. The module should also be listed
last in the authorize section, so that it can set the Auth-Type
attribute as appropriate.
When a RADIUS packet contains a clear-text password in the form of a
User-Password attribute, the rlm_pap module may be used for
authentication. The module requires a "known good" password, which it
uses to validate the password given in the RADIUS packet. That "known
good" password must be supplied by another module (e.g. rlm_files,
rlm_ldap, etc.), and is usually taken from a database.
CONFIGURATION
The only relevant configuration item is:
auto_header
If set to "yes", the module will look inside of the User-
Password attribute for the headers {crypt}, {clear}, etc., and
will automatically create the appropriate attribute, with the
correct value.
This module understands many kinds of password hashing methods, as
given by the following table.
Header Attribute Description
------ --------- -----------
{clear} Cleartext-Password clear-text passwords
{cleartext} Cleartext-Password clear-text passwords
{crypt} Crypt-Password Unix-style "crypt"ed passwords
{md5} MD5-Password MD5 hashed passwords
{smd5} SMD5-Password MD5 hashed passwords, with a salt
{sha} SHA-Password SHA1 hashed passwords
{ssha} SSHA-Password SHA1 hashed passwords, with a salt
{nt} NT-Password Windows NT hashed passwords
{x-nthash} NT-Password Windows NT hashed passwords
{lm} LM-Password Windows Lan Manager (LM) passwords.
The module tries to be flexible when handling the various password
formats. It will automatically handle Base-64 encoded data, hex
strings, and binary data, and convert them to a format that the server
can use.
It is important to understand the difference between the User-Password
and Cleartext-Password attributes. The Cleartext-Password attribute is
the "known good" password for the user. Simply supplying the
Cleartext-Password to the server will result in most authentication
methods working. The User-Password attribute is the password as typed
in by the user on their private machine. The two are not the same, and
should be treated very differently. That is, you should generally not
use the User-Password attribute anywhere in the RADIUS configuration.
For backwards compatibility, there are old configuration parameters
which may be work, although we do not recommend using them.
SECTIONS
authorize authenticate
FILES
/etc/raddb/radiusd.conf
SEE ALSO
radiusd(8), radiusd.conf(5)
AUTHOR
Alan DeKok <aland@freeradius.org>
6 June 2008 rlm_pap(5)