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Diffstat (limited to '')
| -rw-r--r-- | raddb/mods-available/cache_auth | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/raddb/mods-available/cache_auth b/raddb/mods-available/cache_auth new file mode 100644 index 0000000..7485f36 --- /dev/null +++ b/raddb/mods-available/cache_auth @@ -0,0 +1,116 @@ +# -*- text -*- +# +# $Id$ + +# This file contains a collection of cache module configurations +# which have been designed to be used to cache accepts, rejects, and +# LDAP User DNs. The main use of these modules is Google Secure +# LDAP. +# +# In scenarios where there is repeated authentication requests for the same +# user within a short time frame (e.g. 802.1x wifi), these modules can help to +# compensate for slow responses from poor LDAP servers (i.e. Google). +# +# See also mods-available/ldap_google, and sites-available/google-ldap-auth. +# +# The configurations in this file can be used for non-Google LDAP +# servers, too. +# + + +# +# This instance of the cache module caches successful +# authentications. +# +# The TTL controls how often the authentication will be cached. +# +# In addition, if group membership is used as part of the policy, the +# &control:LDAP-Group attribute should be added to the "update: section here. +# +# If a user's authentication is found in the cache, then any data +# which is normally retrieved from LDAP for local policies must also +# be stored in the cache via the "update" section. +# +cache cache_auth_accept { + driver = "rlm_cache_rbtree" + key = "%{md5:%{%{Stripped-User-Name}:-%{User-Name}}%{User-Password}}" + ttl = 7200 + update { + # + # We need to cache something, so we just cache + # a random attribute. This attribute is not used + # for anything else, just as a "place-holder" to + # contain a cache entry. + # + # If you add other attributes to this update section, then + # this attribute can be deleted. + # + &control:User-Category = "success" + } +} + + +# +# This instance of the cache module caches failed authentications. +# +# In many cases, rejected users will repeatedly try to authenticate. +# These repeated authentication attempts can cause significant load +# on the system. By caching the reject, we can avoid hitting the database. +# +# We index the cache by a hash of the client's MAC and the user name +# and password. If a user corrects their user name or password, then +# that authentication attempt won't hit the cache, and their +# credentials will be immediately checked against the database. +# +# The TTL controls how long a combination of device / user and +# password wil be rejected without looking at the database. Once the +# cache entry expires, the server will delete the cache entry, and +# contact the database. +# +cache cache_auth_reject { + driver = "rlm_cache_rbtree" + key = "%{md5:%{Calling-Station-Id}%{Stripped-User-Name}%{User-Password}}" + ttl = 3600 + update { + # + # We need to cache something, so we just cache + # a random attribute. This attribute is not used + # for anything else, just as a "place-holder" to + # contain a cache entry. + # + &control:User-Category = "failure" + } +} + + +# +# An instance of the cache module which caches the LDAP user DN. +# +# If LDAP authentication is being used for a simple auth / reject without +# any need to retrieve other attributes (e.g. group membership), each LDAP +# bind authentication is three steps +# +# - bind as admin user +# - lookup user's DN +# - bind as user using retrieved DN +# +# By caching the DN after the first LDAP querry, the first two steps +# are skipped on subsequent authentications. +# +# If an alternative attribute name is being used for the user DN, you +# should change the update section here appropriately. But that is +# likely rare. +# +# In scenarios where DNs may change, consideration should be given as +# to whether use of this cache may create issues. i.e. if the cache +# doesn't help, then don't use it. +# +cache cache_ldap_user_dn { + driver = "rlm_cache_rbtree" + key = "%{Stripped-User-Name}" + ttl = 86400 + update { + &control:LDAP-UserDN = &control:LDAP-UserDN + } +} + |