freeradius: support for EAP-TTLS/PAP and EAP-PEAP/GTC

playbooks/freeradius.yml

@@ -4,6 +4,9 @@
     - radius-1.isp.infra.auro.re
   vars:
     radiusd__clients:
+      localhost:
+        addr: 127.0.0.1
+        secret: abcdef
       wifi-ap-v4:
         addr: 10.102.0.0/16
         secret: abcdef

roles/freeradius/defaults/main.yml

@@ -18,6 +18,8 @@ radiusd__enabled_modules_minimal:
   - realm # TODO
   - unpack # TODO
   - eap_inner
+  - ldap
+  - pap
   - utf8
 radiusd__enabled_modules: []
 radiusd__tls_cipher_list: DEFAULT

roles/freeradius/tasks/main.yml

@@ -54,6 +54,8 @@
     - mods-available/eap_inner
     - mods-config/attr_filter/access_challenge
     - mods-config/attr_filter/access_reject
+    - sites-available/inner-tunnel
+    - sites-available/default
   notify:
     - Restart freeradius
 

roles/freeradius/templates/clients.conf.j2

@@ -2,12 +2,8 @@
 
 {% for name, client in radiusd__clients.items() %}
 client {{ name }} {
-{% if client.addr | ansible.utils.ipv4 %}
-    ipv4addr = {{ client.addr | ansible.utils.ipv4("network") }}
-{% else %}
-    ipv6addr = {{ client.addr | ansible.utils.ipaddr("network") }}
-{% endif %}
-    netmask = {{ client.addr | ansible.utils.ipaddr("prefix") }}
+    ipaddr = {{ client.addr }}
+    shortname = {{ name }}
     proto = *
     require_message_authenticator = yes
     nastype = other

roles/freeradius/templates/mods-available/eap.j2

@@ -5,6 +5,7 @@ eap {
     default_eap_type = peap
 
     type = peap
+    type = ttls
 
     ignore_unknown_eap_types = no
 
@@ -40,6 +41,16 @@ eap {
     peap {
         tls = tls-common
         default_eap_type = gtc
+        require_client_cert = no
+        copy_request_to_tunnel = no
+        use_tunneled_reply = no
+        virtual_server = inner-tunnel
+    }
+
+    ttls {
+        tls = tls-common
+        default_eap_type = pap
+        require_client_cert = no
         copy_request_to_tunnel = no
         use_tunneled_reply = no
         virtual_server = inner-tunnel

roles/freeradius/templates/mods-available/eap_inner.j2

@@ -5,13 +5,10 @@ eap inner-eap {
     default_eap_type = gtc
 
     type = gtc
-    type = mschapv2
+    type = pap
 
     gtc {
-        auth_type = local
-    }
-
-    mschapv2 {
+        auth_type = LDAP
     }
 
 }

roles/freeradius/templates/mods-available/ldap.j2

@@ -0,0 +1,50 @@
+{{ ansible_managed | comment }}
+
+ldap {
+
+    server = "ldap://ldap-1.int.infra.auro.re"
+
+    # TODO: quand on passera en prod, créer un utilisation dédié
+    identity = "cn=Directory manager"
+    password = "MotDePasseSuperComplique"
+
+    base_dn = "ou=users,dc=auro,dc=re"
+
+    user_dn = "LDAP-UserDn"
+
+    user {
+        base_dn = "${..base_dn}"
+        filter = "{{ '(uid=%{%{Stripped-User-Name}:-%{User-Name}})' }}"
+    }
+
+    group {
+        base_dn = "${..base_dn}"
+        filter = "(objectClass=posixGroup)"
+        membership_attribute = "memberOf"
+    }
+
+    # TODO
+    options {
+        chase_referrals = yes
+        rebind = yes
+        res_timeout = 10
+        srv_timelimit = 3
+        net_timeout = 1
+        idle = 60
+        probes = 3
+        interval = 3
+        ldap_debug = 0x0028
+    }
+
+    pool {
+        start = ${thread[pool].start_servers}
+        min = ${thread[pool].min_spare_servers}
+        max = ${thread[pool].max_servers}
+        spare = ${thread[pool].max_spare_servers}
+        uses = 0
+        retry_delay = 30
+        lifetime = 0
+        idle_timeout = 60
+    }
+
+}

roles/freeradius/templates/mods-available/pap.j2

@@ -0,0 +1,5 @@
+{{ ansible_managed | comment }}
+
+pap {
+    normalise = no
+}

roles/freeradius/templates/sites-available/default.j2

@@ -0,0 +1,70 @@
+{{ ansible_managed | comment }}
+
+server default {
+
+    listen {
+        type = auth
+        ipaddr = *
+        port = 0
+        limit {
+            max_connections = 16
+            lifetime = 0
+            idle_timeout = 30
+        }
+    }
+
+    listen {
+        type = auth
+        ipv6addr = *
+        port = 0
+        limit {
+            max_connections = 16
+            lifetime = 0
+            idle_timeout = 30
+        }
+    }
+
+    authorize {
+        filter_username # TODO
+        preprocess # TODO
+        suffix
+        eap
+    }
+
+    authenticate {
+        eap
+    }
+
+    preacct {
+    }
+
+    accounting {
+    }
+
+    post-auth {
+        if (session-state:User-Name && reply:User-Name \
+                && request:User-Name \
+                && (reply:User-Name == request:User-Name)) {
+            update reply {
+                &User-Name !* ANY
+            }
+        }
+        update {
+            &reply: += &session-state:
+        }
+        Post-Auth-Type REJECT {
+            attr_filter.access_reject
+            eap
+            remove_reply_message_if_eap
+        }
+        remove_reply_message_if_eap
+    }
+
+    pre-proxy {
+    }
+
+    post-proxy {
+        eap
+    }
+
+}

roles/freeradius/templates/sites-available/inner-tunnel.j2

@@ -0,0 +1,39 @@
+{{ ansible_managed | comment }}
+
+server inner-tunnel {
+
+    authorize {
+        # Look for realm using the 'suffix' format (user@realm)
+        suffix
+        # Don't proxy requests from inner tunnel
+        update control {
+            &Proxy-To-Realm := LOCAL
+        }
+        # TODO: vérifier que le realm est soit vide, soit 'auro.re'
+        # Must be before 'ldap', so that we don't query the LDAP server
+        # for "internal" packets (cf. documentation for
+	# sites-available/inner-tunnel)
+        inner-eap {
+            ok = return
+        }
+        ldap
+        # See https://github.com/FreeRADIUS/freeradius-server/blob/master/doc/antora/modules/howto/pages/modules/ldap/authentication.adoc
+        if ((ok || updated) && User-Password) {
+            update control {
+                Auth-Type := ldap
+            }
+        }
+        pap
+    }
+
+    authenticate {
+        inner-eap
+        # Authenticate using 'Auth-Type = LDAP'
+        # This is not recommended by FreeRADIUS (cf. documentation for
+	# sites-available/default), but the password hashing scheme used
+	# by 389DS is not yet supported by FreeRADIUS 3
+        # (cf. https://github.com/FreeRADIUS/freeradius-server/issues/2649)
+        ldap
+    }
+
+}