FreeRadius - Warning in windows when try connect to a Wi-Fi network (PEAP/MSCHAPv2)

Helder Santos hsantos at ipbrick.com
Fri Feb 13 10:00:19 CET 2015


Hi,

I setup the FreeRadius EAP module and an AP to authenticate with 
PEAP/MSCHAPv2. However when I connect with any laptop (Windows 7), 
appears the following warning:

"Details Radius Server: xpto Root CA: AddTrust External CA Root The 
server xpto presented a valid certifiate issued by "AddTrust External CA 
Root", but "AddTrus External CA Root" is not configured as a valid trus 
anchor for this profile."

I attached a image with this warning.
If I ignore the warning, I can connect to the Wi-Fi network, however I 
want understand why this happen and I want that the warning not appear 
any more in other laptops.

I have done several searches but could not solve this problem.

Server details:
- The server certificate is signed by COMODO
- OS: Debian Wheezy
- FreeRadius v2.1.12

I attached the eap.conf and the windows 7 warning.

Can anyone help me solve this problem?

Regards,
Helder

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# Generated in 2014-Nov-19 12:11
# -*- text -*-
##
##  eap.conf -- Configuration for EAP types (PEAP, TTLS, etc.)
##
##	$Id$

#######################################################################
#
#  Whatever you do, do NOT set 'Auth-Type := EAP'.  The server
#  is smart enough to figure this out on its own.  The most
#  common side effect of setting 'Auth-Type := EAP' is that the
#  users then cannot use ANY other authentication method.
#
#  EAP types NOT listed here may be supported via the "eap2" module.
#  See experimental.conf for documentation.
#
        eap {
                #  Invoke the default supported EAP type when
                #  EAP-Identity response is received.
                #
                #  The incoming EAP messages DO NOT specify which EAP
                #  type they will be using, so it MUST be set here.
                #
                #  For now, only one default EAP type may be used at a time.
                #
                #  If the EAP-Type attribute is set by another module,
                #  then that EAP type takes precedence over the
                #  default type configured here.
                #
                default_eap_type = peap

                #  A list is maintained to correlate EAP-Response
                #  packets with EAP-Request packets.  After a
                #  configurable length of time, entries in the list
                #  expire, and are deleted.
                #
                timer_expire     = 60

                #  There are many EAP types, but the server has support
                #  for only a limited subset.  If the server receives
                #  a request for an EAP type it does not support, then
                #  it normally rejects the request.  By setting this
                #  configuration to "yes", you can tell the server to
                #  instead keep processing the request.  Another module
                #  MUST then be configured to proxy the request to
                #  another RADIUS server which supports that EAP type.
                #
                #  If another module is NOT configured to handle the
                #  request, then the request will still end up being
                #  rejected.
                ignore_unknown_eap_types = no

                # Cisco AP1230B firmware 12.2(13)JA1 has a bug.  When given
                # a User-Name attribute in an Access-Accept, it copies one
                # more byte than it should.
                #
                # We can work around it by configurably adding an extra
                # zero byte.
                cisco_accounting_username_bug = no

		        #
				#  Help prevent DoS attacks by limiting the number of
				#  sessions that the server is tracking.  Most systems
				#  can handle ~30 EAP sessions/s, so the default limit
				#  of 4096 should be OK.
				max_sessions = 4096

                # Supported EAP-types

                #
                #  We do NOT recommend using EAP-MD5 authentication
                #  for wireless connections.  It is insecure, and does
                #  not provide for dynamic WEP keys.
                #
                md5 {
                }

                # Cisco LEAP
                #
                #  We do not recommend using LEAP in new deployments.  See:
                #  http://www.securiteam.com/tools/5TP012ACKE.html
                #
                #  Cisco LEAP uses the MS-CHAP algorithm (but not
                #  the MS-CHAP attributes) to perform it's authentication.
                #
                #  As a result, LEAP *requires* access to the plain-text
                #  User-Password, or the NT-Password attributes.
                #  'System' authentication is impossible with LEAP.
                #
                leap {
                }

                #  Generic Token Card.
                #
                #  Currently, this is only permitted inside of EAP-TTLS,
                #  or EAP-PEAP.  The module "challenges" the user with
                #  text, and the response from the user is taken to be
                #  the User-Password.
                #
                #  Proxying the tunneled EAP-GTC session is a bad idea,
                #  the users password will go over the wire in plain-text,
                #  for anyone to see.
                #
                gtc {
                        #  The default challenge, which many clients
                        #  ignore..
                        #challenge = "Password: "

                        #  The plain-text response which comes back
                        #  is put into a User-Password attribute,
                        #  and passed to another module for
                        #  authentication.  This allows the EAP-GTC
                        #  response to be checked against plain-text,
                        #  or crypt'd passwords.
                        #
                        #  If you say "Local" instead of "PAP", then
                        #  the module will look for a User-Password
                        #  configured for the request, and do the
                        #  authentication itself.
                        #
                        auth_type = PAP
                }

                ## EAP-TLS
				#
				#  See raddb/certs/README for additional comments
				#  on certificates.
				#
				#  If OpenSSL was not found at the time the server was
				#  built, the "tls", "ttls", and "peap" sections will
				#  be ignored.
				#
				#  Otherwise, when the server first starts in debugging
				#  mode, test certificates will be created.  See the
				#  "make_cert_command" below for details, and the README
				#  file in raddb/certs
				#
				#  These test certificates SHOULD NOT be used in a normal
				#  deployment.  They are created only to make it easier
				#  to install the server, and to perform some simple
				#  tests with EAP-TLS, TTLS, or PEAP.
				#
				#  See also:
				#
				#  http://www.dslreports.com/forum/remark,9286052~mode=flat
				#
				#  Note that you should NOT use a globally known CA here!
				#  e.g. using a Verisign cert as a "known CA" means that
				#  ANYONE who has a certificate signed by them can
				#  authenticate via EAP-TLS!  This is likely not what you want.
                tls {
			#
			#  These is used to simplify later configurations.
			#
			certdir = ${confdir}/certs
			cadir = ${confdir}/certs

                        #private_key_password = whatever
                        private_key_file = ${certdir}/server.key

                        #  If Private key & Certificate are located in
                        #  the same file, then private_key_file &
                        #  certificate_file must contain the same file
                        #  name.
			#
			#  If CA_file (below) is not used, then the
			#  certificate_file below MUST include not
			#  only the server certificate, but ALSO all
			#  of the CA certificates used to sign the
			#  server certificate.
                        certificate_file = ${certdir}/server.crt

			#  Trusted Root CA list
			#
			#  ALL of the CA's in this list will be trusted
			#  to issue client certificates for authentication.
			#
			#  In general, you should use self-signed
			#  certificates for 802.1x (EAP) authentication.
			#  In that case, this CA file should contain
			#  *one* CA certificate.
			#
			#  This parameter is used only for EAP-TLS,
			#  when you issue client certificates.  If you do
			#  not use client certificates, and you do not want
			#  to permit EAP-TLS authentication, then delete
			#  this configuration item.
                        CA_file = ${cadir}/ca-bundle.pem

			#
			#  For DH cipher suites to work, you have to
			#  run OpenSSL to create the DH file first:
			#
			#  	openssl dhparam -out certs/dh 1024
			#
			dh_file = ${certdir}/dh
			random_file = /dev/urandom

                        #
                        #  This can never exceed the size of a RADIUS
                        #  packet (4096 bytes), and is preferably half
                        #  that, to accomodate other attributes in
                        #  RADIUS packet.  On most APs the MAX packet
                        #  length is configured between 1500 - 1600
                        #  In these cases, fragment size should be
                        #  1024 or less.
                        #
		#	fragment_size = 1024

                        #  include_length is a flag which is
                        #  by default set to yes If set to
                        #  yes, Total Length of the message is
                        #  included in EVERY packet we send.
                        #  If set to no, Total Length of the
                        #  message is included ONLY in the
                        #  First packet of a fragment series.
                        #
		#	include_length = yes

                        #  Check the Certificate Revocation List
                        #
                        #  1) Copy CA certificates and CRLs to same directory.
                        #  2) Execute 'c_rehash <CA certs&CRLs Directory>'.
                        #    'c_rehash' is OpenSSL's command.
			#  3) uncomment the line below.
                        #  5) Restart radiusd
		#	check_crl = yes
	#		CA_path = ${cadir}

                       #
                       #  If check_cert_issuer is set, the value will
                       #  be checked against the DN of the issuer in
                       #  the client certificate.  If the values do not
                       #  match, the cerficate verification will fail,
                       #  rejecting the user.
                       #
		       #  In 2.1.10 and later, this check can be done
		       #  more generally by checking the value of the
		       #  TLS-Client-Cert-Issuer attribute.  This check
		       #  can be done via any mechanism you choose.
		       #
		#       check_cert_issuer = "/C=GB/ST=Berkshire/L=Newbury/O=My Company Ltd"

                       #
                       #  If check_cert_cn is set, the value will
                       #  be xlat'ed and checked against the CN
                       #  in the client certificate.  If the values
                       #  do not match, the certificate verification
                       #  will fail rejecting the user.
                       #
                       #  This check is done only if the previous
                       #  "check_cert_issuer" is not set, or if
                       #  the check succeeds.
                       #
		       #  In 2.1.10 and later, this check can be done
		       #  more generally by checking the value of the
		       #  TLS-Client-Cert-CN attribute.  This check
		       #  can be done via any mechanism you choose.
                #
		#	check_cert_cn = %{User-Name}
		#
                        # Set this option to specify the allowed
                        # TLS cipher suites.  The format is listed
			# in "man 1 ciphers".
			cipher_list = "DEFAULT"

			#

			# This command creates the initial "snake oil"
			# certificates when the server is run as root,
			# and via "radiusd -X".
			#
			# As of 2.1.11, it *also* checks the server
			# certificate for validity, including expiration.
			# This means that radiusd will refuse to start
			# when the certificate has expired.  The alternative
			# is to have the 802.1X clients refuse to connect
			# when they discover the certificate has expired.
			#
			# Debugging client issues is hard, so it's better
			# for the server to print out an error message,
			# and refuse to start.
			#
			make_cert_command = "${certdir}/bootstrap"

			#
			#  Elliptical cryptography configuration
			#
			#  Only for OpenSSL >= 0.9.8.f
			#
			ecdh_curve = "prime256v1"

			#
			#  Session resumption / fast reauthentication
			#  cache.
			#
			#  The cache contains the following information:
			#
			#  session Id - unique identifier, managed by SSL
			#  User-Name  - from the Access-Accept
			#  Stripped-User-Name - from the Access-Request
			#  Cached-Session-Policy - from the Access-Accept
			#
			#  The "Cached-Session-Policy" is the name of a
			#  policy which should be applied to the cached
			#  session.  This policy can be used to assign
			#  VLANs, IP addresses, etc.  It serves as a useful
			#  way to re-apply the policy from the original
			#  Access-Accept to the subsequent Access-Accept
			#  for the cached session.
			#
			#  On session resumption, these attributes are
			#  copied from the cache, and placed into the
			#  reply list.
			#
			#  You probably also want "use_tunneled_reply = yes"
			#  when using fast session resumption.
			#
			cache {
			      #
			      #  Enable it.  The default is "no".
			      #  Deleting the entire "cache" subsection
			      #  Also disables caching.
			      #
			      #  You can disallow resumption for a
			      #  particular user by adding the following
			      #  attribute to the control item list:
			      #
			      #		Allow-Session-Resumption = No
			      #
			      #  If "enable = no" below, you CANNOT
			      #  enable resumption for just one user
			      #  by setting the above attribute to "yes".
			      #
			      enable = no

			      #
			      #  Lifetime of the cached entries, in hours.
			      #  The sessions will be deleted after this
			      #  time.
			      #
			      lifetime = 24 # hours

			      #
			      #  The maximum number of entries in the
			      #  cache.  Set to "0" for "infinite".
			      #
			      #  This could be set to the number of users
			      #  who are logged in... which can be a LOT.
			      #
			      max_entries = 255
                        }

			#
			#  As of version 2.1.10, client certificates can be
			#  validated via an external command.  This allows
			#  dynamic CRLs or OCSP to be used.
			#
			#  This configuration is commented out in the
			#  default configuration.  Uncomment it, and configure
			#  the correct paths below to enable it.
			#
			verify {
				#  A temporary directory where the client
				#  certificates are stored.  This directory
				#  MUST be owned by the UID of the server,
				#  and MUST not be accessible by any other
				#  users.  When the server starts, it will do
				#  "chmod go-rwx" on the directory, for
				#  security reasons.  The directory MUST
				#  exist when the server starts.
				#
				#  You should also delete all of the files
				#  in the directory when the server starts.
		#     		tmpdir = /tmp/radiusd

				#  The command used to verify the client cert.
				#  We recommend using the OpenSSL command-line
				#  tool.
				#
				#  The ${..CA_path} text is a reference to
				#  the CA_path variable defined above.
				#
				#  The %{TLS-Client-Cert-Filename} is the name
				#  of the temporary file containing the cert
				#  in PEM format.  This file is automatically
				#  deleted by the server when the command
				#  returns.
		#    		client = "/path/to/openssl verify -CApath ${..CA_path} %{TLS-Client-Cert-Filename}"
			}

			#
			#  OCSP Configuration
			#  Certificates can be verified against an OCSP
			#  Responder. This makes it possible to immediately
			#  revoke certificates without the distribution of
			#  new Certificate Revokation Lists (CRLs).
			#
			ocsp {
			      #
			      #  Enable it.  The default is "no".
			      #  Deleting the entire "ocsp" subsection
			      #  Also disables ocsp checking
			      #
			      enable = no

			      #
			      #  The OCSP Responder URL can be automatically
			      #  extracted from the certificate in question.
			      #  To override the OCSP Responder URL set
			      #  "override_cert_url = yes". 
			      #
			      override_cert_url = yes

			      #
			      #  If the OCSP Responder address is not
			      #  extracted from the certificate, the
			      #  URL can be defined here.

			      #
			      #  Limitation: Currently the HTTP
			      #  Request is not sending the "Host: "
			      #  information to the web-server.  This
			      #  can be a problem if the OCSP
			      #  Responder is running as a vhost.
			      #
			      url = "http://127.0.0.1/ocsp/"
			}
		}

                #  The TTLS module implements the EAP-TTLS protocol,
                #  which can be described as EAP inside of Diameter,
                #  inside of TLS, inside of EAP, inside of RADIUS...
                #
                #  Surprisingly, it works quite well.
                #
                #  The TTLS module needs the TLS module to be installed
                #  and configured, in order to use the TLS tunnel
                #  inside of the EAP packet.  You will still need to
                #  configure the TLS module, even if you do not want
                #  to deploy EAP-TLS in your network.  Users will not
                #  be able to request EAP-TLS, as it requires them to
                #  have a client certificate.  EAP-TTLS does not
                #  require a client certificate.
                #
		#  You can make TTLS require a client cert by setting
		#
		#	EAP-TLS-Require-Client-Cert = Yes
		#
		#  in the control items for a request.
		#
                ttls {
                        #  The tunneled EAP session needs a default
                        #  EAP type which is separate from the one for
                        #  the non-tunneled EAP module.  Inside of the
                        #  TTLS tunnel, we recommend using EAP-MD5.
                        #  If the request does not contain an EAP
                        #  conversation, then this configuration entry
                        #  is ignored.
                        default_eap_type = md5

                        #  The tunneled authentication request does
                        #  not usually contain useful attributes
                        #  like 'Calling-Station-Id', etc.  These
                        #  attributes are outside of the tunnel,
                        #  and normally unavailable to the tunneled
                        #  authentication request.
                        #
                        #  By setting this configuration entry to
                        #  'yes', any attribute which NOT in the
                        #  tunneled authentication request, but
                        #  which IS available outside of the tunnel,
                        #  is copied to the tunneled request.
                        #
                        # allowed values: {no, yes}
                        copy_request_to_tunnel = yes

                        #  The reply attributes sent to the NAS are
                        #  usually based on the name of the user
                        #  'outside' of the tunnel (usually
                        #  'anonymous').  If you want to send the
                        #  reply attributes based on the user name
                        #  inside of the tunnel, then set this
                        #  configuration entry to 'yes', and the reply
                        #  to the NAS will be taken from the reply to
                        #  the tunneled request.
                        #
                        # allowed values: {no, yes}
			use_tunneled_reply = yes

			#
			#  The inner tunneled request can be sent
			#  through a virtual server constructed
			#  specifically for this purpose.
			#
			#  If this entry is commented out, the inner
			#  tunneled request will be sent through
			#  the virtual server that processed the
			#  outer requests.
			#
			virtual_server = "inner-tunnel"

			#  This has the same meaning as the
			#  same field in the "tls" module, above.
			#  The default value here is "yes".
		#	include_length = yes
                }

		##################################################
                #
		#  !!!!! WARNINGS for Windows compatibility  !!!!!
		#
		##################################################
		#
		#  If you see the server send an Access-Challenge,
		#  and the client never sends another Access-Request,
		#  then
		#
		#		STOP!
		#
		#  The server certificate has to have special OID's
		#  in it, or else the Microsoft clients will silently
		#  fail.  See the "scripts/xpextensions" file for
		#  details, and the following page:
		#
		#	http://support.microsoft.com/kb/814394/en-us
		#
		#  For additional Windows XP SP2 issues, see:
		#
		#	http://support.microsoft.com/kb/885453/en-us
		#
		#
		#  If is still doesn't work, and you're using Samba,
		#  you may be encountering a Samba bug.  See:
		#
		#	https://bugzilla.samba.org/show_bug.cgi?id=6563
		#
		#  Note that we do not necessarily agree with their
		#  explanation... but the fix does appear to work.
		#
		##################################################

		#
                #  The tunneled EAP session needs a default EAP type
                #  which is separate from the one for the non-tunneled
                #  EAP module.  Inside of the TLS/PEAP tunnel, we
                #  recommend using EAP-MS-CHAPv2.
                #
                #  The PEAP module needs the TLS module to be installed
                #  and configured, in order to use the TLS tunnel
                #  inside of the EAP packet.  You will still need to
                #  configure the TLS module, even if you do not want
                #  to deploy EAP-TLS in your network.  Users will not
                #  be able to request EAP-TLS, as it requires them to
                #  have a client certificate.  EAP-PEAP does not
                #  require a client certificate.
                #
                peap {
                        #  The tunneled EAP session needs a default
                        #  EAP type which is separate from the one for
                        #  the non-tunneled EAP module.  Inside of the
                        #  PEAP tunnel, we recommend using MS-CHAPv2,
                        #  as that is the default type supported by
                        #  Windows clients.
                        default_eap_type = mschapv2

                        #  the PEAP module also has these configuration
                        #  items, which are the same as for TTLS.
                        copy_request_to_tunnel = yes
                        use_tunneled_reply = yes

                        #  When the tunneled session is proxied, the
                        #  home server may not understand EAP-MSCHAP-V2.
                        #  Set this entry to "no" to proxy the tunneled
                        #  EAP-MSCHAP-V2 as normal MSCHAPv2.
		#	proxy_tunneled_request_as_eap = yes

			#
			#  The inner tunneled request can be sent
			#  through a virtual server constructed
			#  specifically for this purpose.
			#
			#  If this entry is commented out, the inner
			#  tunneled request will be sent through
			#  the virtual server that processed the
			#  outer requests.
			#
			virtual_server = "inner-tunnel"

			# This option enables support for MS-SoH
			# see doc/SoH.txt for more info.
			# It is disabled by default.
			#
#			soh = yes

			#
			# The SoH reply will be turned into a request which
			# can be sent to a specific virtual server:
			#
#			soh_virtual_server = "soh-server"
                }

                #
                #  This takes no configuration.
                #
                #  Note that it is the EAP MS-CHAPv2 sub-module, not
                #  the main 'mschap' module.
                #
                #  Note also that in order for this sub-module to work,
                #  the main 'mschap' module MUST ALSO be configured.
                #
                #  This module is the *Microsoft* implementation of MS-CHAPv2
                #  in EAP.  There is another (incompatible) implementation
                #  of MS-CHAPv2 in EAP by Cisco, which FreeRADIUS does not
                #  currently support.
                #
                mschapv2 {
			#  Prior to version 2.1.11, the module never
			#  sent the MS-CHAP-Error message to the
			#  client.  This worked, but it had issues
			#  when the cached password was wrong.  The
			#  server *should* send "E=691 R=0" to the
			#  client, which tells it to prompt the user
			#  for a new password.
			#
			#  The default is to behave as in 2.1.10 and
			#  earlier, which is known to work.  If you
			#  set "send_error = yes", then the error
			#  message will be sent back to the client.
			#  This *may* help some clients work better,
			#  but *may* also cause other clients to stop
			#  working.
			#
#			send_error = no
                }
        }
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