---
name: "rlm_chap"
section: "5"
platform: "linux"
package: "freeradius"
version: "3.2.10-4"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/rlm_chap"
---

# rlm\_chap(5)

FreeRADIUS Module

## NAME

rlm\_chap - FreeRADIUS Module

## DESCRIPTION

The *rlm\_chap* module provides CHAP functionality.

This module validates a user with CHAP authentication. If called in Authorize, it will look for CHAP-Password attribute in the Access-Request and adds an Auth-Type attribute set to CHAP if the Config-Items list unless  Auth-Type has already set.

CHAP authentication requires access to the clear-text password for the user.  Standard Unix system authentication or passwords encrypted via crypt() are not compatible with CHAP.

## SECTIONS

**authorization,** **authentication**

## FILES

*/etc/raddb/radiusd.conf*

## SEE ALSO

[**radiusd**(8)](/radiusd/8.md), [**radiusd.conf**(5)](/radiusd.conf/5.md)

## AUTHOR

Chris Parker, cparker@segv.org