Added notes on inner/outer tunnel identities being different.

[freeradius.git] / raddb / sites-available / inner-tunnel

# -*- text -*-
######################################################################
#
#       This is a virtual server that handles *only* inner tunnel
#       requests for EAP-TTLS and PEAP types.
#
#       $Id$
#
######################################################################

server inner-tunnel {

#  Authorization. First preprocess (hints and huntgroups files),
#  then realms, and finally look in the "users" file.
#
#  The order of the realm modules will determine the order that
#  we try to find a matching realm.
#
#  Make *sure* that 'preprocess' comes before any realm if you 
#  need to setup hints for the remote radius server
authorize {
        #
        #  The chap module will set 'Auth-Type := CHAP' if we are
        #  handling a CHAP request and Auth-Type has not already been set
        chap

        #
        #  If the users are logging in with an MS-CHAP-Challenge
        #  attribute for authentication, the mschap module will find
        #  the MS-CHAP-Challenge attribute, and add 'Auth-Type := MS-CHAP'
        #  to the request, which will cause the server to then use
        #  the mschap module for authentication.
        mschap

        #
        #  Pull crypt'd passwords from /etc/passwd or /etc/shadow,
        #  using the system API's to get the password.  If you want
        #  to read /etc/passwd or /etc/shadow directly, see the
        #  passwd module, above.
        #
        unix

        #
        #  Look for IPASS style 'realm/', and if not found, look for
        #  '@realm', and decide whether or not to proxy, based on
        #  that.
#       IPASS

        #
        #  If you are using multiple kinds of realms, you probably
        #  want to set "ignore_null = yes" for all of them.
        #  Otherwise, when the first style of realm doesn't match,
        #  the other styles won't be checked.
        #
        #  Note that proxying the inner tunnel authentication means
        #  that the user MAY use one identity in the outer session
        #  (e.g. "anonymous", and a different one here
        #  (e.g. "user@example.com").  The inner session will then be
        #  proxied elsewhere for authentication.  If you are not
        #  careful, this means that the user can cause you to forward
        #  the authentication to another RADIUS server, and have the
        #  accounting logs *not* sent to the other server.  This makes
        #  it difficult to bill people for their network activity.
        #
        suffix
#       ntdomain

        #
        #  The "suffix" module takes care of stripping the domain
        #  (e.g. "@example.com") from the User-Name attribute, and the
        #  next few lines ensure that the request is not proxied.
        #
        #  If you want the inner tunnel request to be proxied, delete
        #  the next few lines.
        #
        update control {
               Proxy-To-Realm := LOCAL
        }

        #
        #  This module takes care of EAP-MSCHAPv2 authentication.
        #
        #  It also sets the EAP-Type attribute in the request
        #  attribute list to the EAP type from the packet.
        #
        #  The example below uses module failover to avoid querying all
        #  of the following modules if the EAP module returns "ok".
        #  Therefore, your LDAP and/or SQL servers will not be queried
        #  for the many packets that go back and forth to set up TTLS
        #  or PEAP.  The load on those servers will therefore be reduced.
        #
        eap {
                ok = return
        }

        #
        #  Read the 'users' file
        files

        #
        #  Look in an SQL database.  The schema of the database
        #  is meant to mirror the "users" file.
        #
        #  See "Authorization Queries" in sql.conf
#       sql

        #
        #  If you are using /etc/smbpasswd, and are also doing
        #  mschap authentication, the un-comment this line, and
        #  configure the 'etc_smbpasswd' module, above.
#       etc_smbpasswd

        #
        #  The ldap module will set Auth-Type to LDAP if it has not
        #  already been set
#       ldap

        #
        #  Enforce daily limits on time spent logged in.
#       daily

        #
        # Use the checkval module
#       checkval

        expiration
        logintime

        #
        #  If no other module has claimed responsibility for
        #  authentication, then try to use PAP.  This allows the
        #  other modules listed above to add a "known good" password
        #  to the request, and to do nothing else.  The PAP module
        #  will then see that password, and use it to do PAP
        #  authentication.
        #
        #  This module should be listed last, so that the other modules
        #  get a chance to set Auth-Type for themselves.
        #
        pap
}


#  Authentication.
#
#
#  This section lists which modules are available for authentication.
#  Note that it does NOT mean 'try each module in order'.  It means
#  that a module from the 'authorize' section adds a configuration
#  attribute 'Auth-Type := FOO'.  That authentication type is then
#  used to pick the apropriate module from the list below.
#

#  In general, you SHOULD NOT set the Auth-Type attribute.  The server
#  will figure it out on its own, and will do the right thing.  The
#  most common side effect of erroneously setting the Auth-Type
#  attribute is that one authentication method will work, but the
#  others will not.
#
#  The common reasons to set the Auth-Type attribute by hand
#  is to either forcibly reject the user, or forcibly accept him.
#
authenticate {
        #
        #  PAP authentication, when a back-end database listed
        #  in the 'authorize' section supplies a password.  The
        #  password can be clear-text, or encrypted.
        Auth-Type PAP {
                pap
        }

        #
        #  Most people want CHAP authentication
        #  A back-end database listed in the 'authorize' section
        #  MUST supply a CLEAR TEXT password.  Encrypted passwords
        #  won't work.
        Auth-Type CHAP {
                chap
        }

        #
        #  MSCHAP authentication.
        Auth-Type MS-CHAP {
                mschap
        }

        #
        #  Pluggable Authentication Modules.
#       pam

        #
        #  See 'man getpwent' for information on how the 'unix'
        #  module checks the users password.  Note that packets
        #  containing CHAP-Password attributes CANNOT be authenticated
        #  against /etc/passwd!  See the FAQ for details.
        #  
        unix

        # Uncomment it if you want to use ldap for authentication
        #
        # Note that this means "check plain-text password against
        # the ldap database", which means that EAP won't work,
        # as it does not supply a plain-text password.
#       Auth-Type LDAP {
#               ldap
#       }

        #
        #  Allow EAP authentication.
        eap
}

######################################################################
#
#       There are no accounting requests inside of EAP-TTLS or PEAP
#       tunnels.
#
######################################################################


#  Session database, used for checking Simultaneous-Use. Either the radutmp 
#  or rlm_sql module can handle this.
#  The rlm_sql module is *much* faster
session {
        radutmp

        #
        #  See "Simultaneous Use Checking Queries" in sql.conf
#       sql
}


#  Post-Authentication
#  Once we KNOW that the user has been authenticated, there are
#  additional steps we can take.
post-auth {
        # Note that we do NOT assign IP addresses here.
        # If you try to assign IP addresses for EAP authentication types,
        # it WILL NOT WORK.  You MUST use DHCP.

        #
        #  If you want to have a log of authentication replies,
        #  un-comment the following line, and the 'detail reply_log'
        #  section, above.
#       reply_log

        #
        #  After authenticating the user, do another SQL query.
        #
        #  See "Authentication Logging Queries" in sql.conf
#       sql

        #
        #  Instead of sending the query to the SQL server,
        #  write it into a log file.
        #
#       sql_log

        #
        #  Un-comment the following if you have set
        #  'edir_account_policy_check = yes' in the ldap module sub-section of
        #  the 'modules' section.
        #
#       ldap

        #
        #  Access-Reject packets are sent through the REJECT sub-section of the
        #  post-auth section.
        #
        #  Add the ldap module name (or instance) if you have set 
        #  'edir_account_policy_check = yes' in the ldap module configuration
        #
        Post-Auth-Type REJECT {
                attr_filter.access_reject
        }

        #
        #  The example policy below updates the outer tunnel reply
        #  (usually Access-Accept) with the User-Name from the inner
        #  tunnel User-Name.  Since this section is processed in the
        #  context of the inner tunnel, "request" here means "inner
        #  tunnel request", and "outer.reply" means "outer tunnel
        #  reply attributes".
        #
        #  This example is most useful when the outer session contains
        #  a User-Name of "anonymous@....", or a MAC address.  If it
        #  is enabled, the NAS SHOULD use the inner tunnel User-Name
        #  in subsequent accounting packets.  This makes it easier to
        #  track user sessions, as they will all be based on the real
        #  name, and not on "anonymous".
        #
        #  The problem with doing this is that it ALSO exposes the
        #  real user name to any intermediate proxies.  People use
        #  "anonymous" identifiers outside of the tunnel for a very
        #  good reason: it gives them more privacy.  Setting the reply
        #  to contain the real user name removes ALL privacy from
        #  their session.
        #
        #  If you want privacy to remain, see the
        #  Chargeable-User-Identity attribute from RFC 4372.  In order
        #  to use that attribute, you will have to allocate a
        #  per-session identifier for the user, and store it in a
        #  long-term database (e.g. SQL).  You should also use that
        #  attribute INSTEAD of the configuration below.
        #
        #update outer.reply {
        #       User-Name = "%{request:User-Name}"
        #}

}

#
#  When the server decides to proxy a request to a home server,
#  the proxied request is first passed through the pre-proxy
#  stage.  This stage can re-write the request, or decide to
#  cancel the proxy.
#
#  Only a few modules currently have this method.
#
pre-proxy {
#       attr_rewrite

        #  Uncomment the following line if you want to change attributes
        #  as defined in the preproxy_users file.
#       files

        #  Uncomment the following line if you want to filter requests
        #  sent to remote servers based on the rules defined in the
        #  'attrs.pre-proxy' file.
#       attr_filter.pre-proxy

        #  If you want to have a log of packets proxied to a home
        #  server, un-comment the following line, and the
        #  'detail pre_proxy_log' section, above.
#       pre_proxy_log
}

#
#  When the server receives a reply to a request it proxied
#  to a home server, the request may be massaged here, in the
#  post-proxy stage.
#
post-proxy {

        #  If you want to have a log of replies from a home server,
        #  un-comment the following line, and the 'detail post_proxy_log'
        #  section, above.
#       post_proxy_log

#       attr_rewrite

        #  Uncomment the following line if you want to filter replies from
        #  remote proxies based on the rules defined in the 'attrs' file.
#       attr_filter.post-proxy

        #
        #  If you are proxying LEAP, you MUST configure the EAP
        #  module, and you MUST list it here, in the post-proxy
        #  stage.
        #
        #  You MUST also use the 'nostrip' option in the 'realm'
        #  configuration.  Otherwise, the User-Name attribute
        #  in the proxied request will not match the user name
        #  hidden inside of the EAP packet, and the end server will
        #  reject the EAP request.
        #
        eap

        #
        #  If the server tries to proxy a request and fails, then the
        #  request is processed through the modules in this section.
        #
        #  The main use of this section is to permit robust proxying
        #  of accounting packets.  The server can be configured to
        #  proxy accounting packets as part of normal processing.
        #  Then, if the home server goes down, accounting packets can
        #  be logged to a local "detail" file, for processing with
        #  radrelay.  When the home server comes back up, radrelay
        #  will read the detail file, and send the packets to the
        #  home server.
        #
        #  With this configuration, the server always responds to
        #  Accounting-Requests from the NAS, but only writes
        #  accounting packets to disk if the home server is down.
        #
#       Post-Proxy-Type Fail {
#                       detail
#       }

}

} # inner-tunnel server block