rlm_mschap - FreeRADIUS Module

The rlm_mschap module provides MS-CHAP and MS-CHAPv2 authentication support.

This module validates a user with MS-CHAP or MS-CHAPv2 authentication. If called in Authorize, it will look for MS-CHAP Challenge/Response attributes in the Acess-Request and adds an Auth-Type attribute set to MS-CHAP in the Config-Items list unless Auth-Type has already set.

The module can authenticate the MS-CHAP session via plain-text passwords (User-Password attribute), or NT passwords (NT-Password attribute). The module cannot perform authentication against an NT domain.

The module also enforces the SMB-Account-Ctrl attribute. See the Samba documentation for the meaning of SMB account control. The module does not read Samba password files. Instead, the fIrlm_passwd module can be used to read a Samba password file, and supply an NT-Password attribute which this module can use.

The main configuration items to be aware of are:

authtype

This is the string used to set the authtype. Normally it should be left to the default value of MS-CHAP.

use_mppe

Unless this is set to 'no', FreeRADIUS will add MS-CHAP-MPPE-Keys for MS-CHAPv1 and MS-MPPE-Recv-Key/MS-MPPE-Send-Key for MS-CHAPv2. The default is 'yes'.

require_encryption

If MPPE is enabled, setting this attribute to 'yes' will cause the MS-MPPE-Encryption-Policy attribute to be set to require encryption. The default is 'no'.

require_strong

If MPPE is enabled, setting this attribute to 'yes' will cause the MS-MPPE-Encryption-Types attribute to be set to require a 128 bit key. The default is 'no'.

with_ntdomain_hack

Windows clients send User-Name in the form of "DOMAIN\User", but send the challenge/response based only on the User portion. Setting this value to yes, enables a work-around for this error. The default is 'no'.

modules { ...

mschap {

authtype = MS-CHAP

use_mppe = yes

}

...

}

...

authorize { ...

mschap

...

} ...

authenticate { ...

mschap

...

}

authorization, authentication

/etc/raddb/radiusd.conf

radiusd(8), radiusd.conf(5)

Chris Parker, cparker@segv.org