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+# This virtual server allows EAP-TLS to reject access requests
+# based on some attributes of the certificates involved.
+#
+# To use this virtual server, you must enable it in the tls
+# section of mods-enabled/eap as well as adding a link to this
+# file in sites-enabled/.
+#
+#
+# Value-pairs that are available for checking include:
+#
+# TLS-Client-Cert-Subject
+# TLS-Client-Cert-Issuer
+# TLS-Client-Cert-Common-Name
+# TLS-Client-Cert-Subject-Alt-Name-Email
+#
+# To see a full list of attributes, run the server in debug mode
+# with this virtual server configured, and look at the attributes
+# passed in to this virtual server.
+#
+#
+# This virtual server is also useful when using EAP-TLS as it is
+# only called once, just before the final Accept is about to be
+# returned from eap, whereas the outer authorize section is called
+# multiple times for each challenge / response. For this reason,
+# here may be a good location to put authentication logging, and
+# modules that check for further authorization, especially if they
+# hit external services such as sql or ldap.
+
+
+server check-eap-tls {
+
+
+# Authorize - this is the only section required.
+#
+# To accept the access request, set Auth-Type = Accept, otherwise
+# set it to Reject.
+
+authorize {
+
+ #
+ # By default, we just accept the request:
+ #
+ update config {
+ &Auth-Type := Accept
+ }
+
+
+ #
+ # Check the client certificate matches a string, and reject otherwise
+ #
+
+# if ("%{TLS-Client-Cert-Common-Name}" == 'client.example.com') {
+# update config {
+# &Auth-Type := Accept
+# }
+# }
+# else {
+# update config {
+# &Auth-Type := Reject
+# }
+# update reply {
+# &Reply-Message := "Your certificate is not valid."
+# }
+# }
+
+
+ #
+ # Check the client certificate common name against the supplied User-Name
+ #
+# if (&User-Name == "host/%{TLS-Client-Cert-Common-Name}") {
+# update config {
+# &Auth-Type := Accept
+# }
+# }
+# else {
+# update config {
+# &Auth-Type := Reject
+# }
+# }
+
+
+ #
+ # This is a convenient place to call LDAP, for example, when using
+ # EAP-TLS, as it will only be called once, after all certificates as
+ # part of the EAP-TLS challenge process have been verified.
+ #
+ # An example could be to use LDAP to check that the connecting host, as
+ # well as presenting a valid certificate, is also in a group based on
+ # the User-Name (assuming this contains the service principal name).
+ # Settings such as the following could be used in the ldap module
+ # configuration:
+ #
+ # basedn = "dc=example, dc=com"
+ # filter = "(servicePrincipalName=%{User-Name})"
+ # base_filter = "(objectClass=computer)"
+ # groupname_attribute = cn
+ # groupmembership_filter = "(&(objectClass=group)(member=%{control:Ldap-UserDn}))"
+
+# ldap
+
+ # Now let's test membership of an LDAP group (the ldap bind user will
+ # need permission to read this group membership):
+
+# if (!(Ldap-Group == "Permitted-Laptops")) {
+# update config {
+# &Auth-Type := Reject
+# }
+# }
+
+ # or, to be more specific, you could use the group's full DN:
+ # if (!(Ldap-Group == "CN=Permitted-Laptops,OU=Groups,DC=example,DC=org")) {
+
+
+ #
+ # This may be a better place to call the files modules when using
+ # EAP-TLS, as it will only be called once, after the challenge-response
+ # iteration has completed.
+ #
+
+# files
+
+
+ #
+ # Log all request attributes, plus TLS certificate details, to the
+ # auth_log file. Again, this is just once per connection request, so
+ # may be preferable than in the outer authorize section. It is
+ # suggested that 'auth_log' also be in the outer post-auth and
+ # Post-Auth REJECT sections to log reply packet details, too.
+ #
+
+ auth_log
+
+}
+}
+