Can't figure out Group Authentication

22 Jun 2012

      First, I'd like to thank Alan for his beyond countless hours of dedication to all the blogs, forum posting, and general support within the community.  Your write-ups are thorough and well thought out.  I wish more people were like you.  I'm pretty new to RADIUS and as consequently, Linux in general.  So I might ask questions that seem noobish or lame, but it doesn't mean I'm not willing to learn, research etc.  Just bare with me.

Now, the problem is this.  Following Alan DeKok's guide at http://deployingradius.com/documents/configuration/active_directory.html, I was able to get FreeRADIUS 2.X running on CentOS 6.2 with pretty minimal effort.  There were a few things I had to go elsewhere to figure out, but I managed.  I have FreeRADIUS setup and authenticating using NTLM_AUTH.  I was able to join my AD 2008 R2 Domain, I can list users, groups etc.. This RADIUS server will be for authenticating users on all of our Cisco devices, as well as remote access VPN users.  So the problem is this.  It's authenticating...a little too well.

I've added the following entry into "/etc/raddb/clients.conf" to allow AAA on one of my cisco routers.

*************************************

client 10.10.0.5 {
        secret          = REALSECRETOMMITTED

        shortname   = Cisco-2911-VPCRTR
        nastype       = cisco
}
*************************************

Now, I then setup my Cisco router accordingly, and then did an SSH test to it using my AD Account.  Voila!  It worked great.  However, so did every other "Domain User" account in the environment.   This goes back to me being so new to RADIUS and Linux where I don't feel like I'm fully grasping all of the directives within the configuration files, and exactly how they all tie together.  I'm getting there, but just not fast enough.

So, how do I lock down the SSH Authentication to an Active Directory Group of users, or individual users?  Remember, go easy on me.  I'll provide whatever you need to help.  I'm assuming you will ask for my RADIUSD -X output, so I've attached that as well.

NOTE:  One thing I don't understand is how in Alan DeKok's write up from the link above, he says don't use the "DEFAULT    Auth-Type = ntlm_auth" in the "/etc/raddb/users" file, but yet that's one of the final steps to test in the write-up.  Maybe it's because I am so new, but I've been through that document probably 30 times line by line, and yet every time I remove that entry, it breaks the Authentication.

BEGIN RADIUSD -X DEBUG OUTPUT

**************************************************************************************************

**************************************************************************************************

**************************************************************************************************

FreeRADIUS Version 2.1.10, for host x86_64-unknown-linux-gnu, built on Jul 19 2011 at 10:21:08
Copyright (C) 1999-2009 The FreeRADIUS server project and contributors.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
You may redistribute copies of FreeRADIUS under the terms of the
GNU General Public License v2.
Starting - reading configuration files ...
including configuration file /etc/raddb/radiusd.conf
including configuration file /etc/raddb/proxy.conf
including configuration file /etc/raddb/clients.conf
including files in directory /etc/raddb/modules/
including configuration file /etc/raddb/modules/exec
including configuration file /etc/raddb/modules/attr_rewrite
including configuration file /etc/raddb/modules/sqlcounter_expire_on_login
including configuration file /etc/raddb/modules/ippool
including configuration file /etc/raddb/modules/policy
including configuration file /etc/raddb/modules/inner-eap
including configuration file /etc/raddb/modules/krb5
including configuration file /etc/raddb/modules/ntlm_auth
including configuration file /etc/raddb/modules/radutmp
including configuration file /etc/raddb/modules/digest
including configuration file /etc/raddb/modules/ldap
including configuration file /etc/raddb/modules/sql_log
including configuration file /etc/raddb/modules/otp
including configuration file /etc/raddb/modules/pam
including configuration file /etc/raddb/modules/opendirectory
including configuration file /etc/raddb/modules/expiration
including configuration file /etc/raddb/modules/perl
including configuration file /etc/raddb/modules/etc_group
including configuration file /etc/raddb/modules/attr_filter
including configuration file /etc/raddb/modules/echo
including configuration file /etc/raddb/modules/mschap
including configuration file /etc/raddb/modules/logintime
including configuration file /etc/raddb/modules/detail
including configuration file /etc/raddb/modules/smsotp
including configuration file /etc/raddb/modules/smbpasswd
including configuration file /etc/raddb/modules/wimax
including configuration file /etc/raddb/modules/linelog
including configuration file /etc/raddb/modules/sradutmp
including configuration file /etc/raddb/modules/detail.log
including configuration file /etc/raddb/modules/dynamic_clients
including configuration file /etc/raddb/modules/pap
including configuration file /etc/raddb/modules/unix
including configuration file /etc/raddb/modules/files
including configuration file /etc/raddb/modules/detail.example.com
including configuration file /etc/raddb/modules/counter
including configuration file /etc/raddb/modules/passwd
including configuration file /etc/raddb/modules/mac2vlan
including configuration file /etc/raddb/modules/mac2ip
including configuration file /etc/raddb/modules/preprocess
including configuration file /etc/raddb/modules/acct_unique
including configuration file /etc/raddb/modules/cui
including configuration file /etc/raddb/modules/realm
including configuration file /etc/raddb/modules/checkval
including configuration file /etc/raddb/modules/always
including configuration file /etc/raddb/modules/expr
including configuration file /etc/raddb/modules/chap
including configuration file /etc/raddb/eap.conf
including configuration file /etc/raddb/policy.conf
including files in directory /etc/raddb/sites-enabled/
including configuration file /etc/raddb/sites-enabled/inner-tunnel
including configuration file /etc/raddb/sites-enabled/default
including configuration file /etc/raddb/sites-enabled/control-socket
main {
        user = "radiusd"
        group = "radiusd"
        allow_core_dumps = no
}
including dictionary file /etc/raddb/dictionary
main {
        prefix = "/usr"
        localstatedir = "/var"
        logdir = "/var/log/radius"
        libdir = "/usr/lib64/freeradius"
        radacctdir = "/var/log/radius/radacct"
        hostname_lookups = no
        max_request_time = 30
        cleanup_delay = 5
        max_requests = 1024
        pidfile = "/var/run/radiusd/radiusd.pid"
        checkrad = "/usr/sbin/checkrad"
        debug_level = 0
        proxy_requests = yes
 log {
        stripped_names = no
        auth = no
        auth_badpass = no
        auth_goodpass = no
 }
 security {
        max_attributes = 200
        reject_delay = 1
        status_server = yes
 }
}
radiusd: #### Loading Realms and Home Servers ####
 proxy server {
        retry_delay = 5
        retry_count = 3
        default_fallback = no
        dead_time = 120
        wake_all_if_all_dead = no
 }
 home_server localhost {
        ipaddr = 127.0.0.1
        port = 1812
        type = "auth"
        secret = "testing123"
        response_window = 20
        max_outstanding = 65536
        require_message_authenticator = yes
        zombie_period = 40
        status_check = "status-server"
        ping_interval = 30
        check_interval = 30
        num_answers_to_alive = 3
        num_pings_to_alive = 3
        revive_interval = 120
        status_check_timeout = 4
        irt = 2
        mrt = 16
        mrc = 5
        mrd = 30
 }
 home_server_pool my_auth_failover {
        type = fail-over
        home_server = localhost
 }
 realm example.com {
        auth_pool = my_auth_failover
 }
 realm LOCAL {
 }
radiusd: #### Loading Clients ####
 client 172.16.1.1 {
        require_message_authenticator = no
        secret = "REALSECRETOMMITTED"
        shortname = "Cisco-4507-1"
        nastype = "cisco"
 }
 client 172.16.1.3 {
        require_message_authenticator = no
        secret = "REALSECRETOMMITTED"
        shortname = "Cisco-4507-2"
        nastype = "cisco"
 }
 client 172.16.1.2 {
        require_message_authenticator = no
        secret = "REALSECRETOMMITTED"
        shortname = "Cisco-ASA-5520-01"
        nastype = "cisco"
 }
 client 10.10.0.5 {
        require_message_authenticator = no
        secret = "REALSECRETOMMITTED"
        shortname = "Cisco-2911-VPCRTR"
        nastype = "cisco"
 }
 client 172.16.1.10 {
        require_message_authenticator = no
        secret = "REALSECRETOMMITTED"
        shortname = "Cisco-ASA-5510-GDM"
        nastype = "cisco"
 }
 client localhost {
        ipaddr = 127.0.0.1
        require_message_authenticator = no
        secret = "testing123"
        nastype = "other"
 }
radiusd: #### Instantiating modules ####
 instantiate {
 Module: Linked to module rlm_exec
 Module: Instantiating module "exec" from file /etc/raddb/modules/exec
  exec {
        wait = no
        input_pairs = "request"
        shell_escape = yes
  }
 Module: Linked to module rlm_expr
 Module: Instantiating module "expr" from file /etc/raddb/modules/expr
 Module: Linked to module rlm_expiration
 Module: Instantiating module "expiration" from file /etc/raddb/modules/expiration
  expiration {
        reply-message = "Password Has Expired  "
  }
 Module: Linked to module rlm_logintime
 Module: Instantiating module "logintime" from file /etc/raddb/modules/logintime
  logintime {
        reply-message = "You are calling outside your allowed timespan  "
        minimum-timeout = 60
  }
 }
radiusd: #### Loading Virtual Servers ####
server inner-tunnel { # from file /etc/raddb/sites-enabled/inner-tunnel
 modules {
 Module: Checking authenticate {...} for more modules to load
 Module: Linked to module rlm_pap
 Module: Instantiating module "pap" from file /etc/raddb/modules/pap
  pap {
        encryption_scheme = "auto"
        auto_header = no
  }
 Module: Linked to module rlm_chap
 Module: Instantiating module "chap" from file /etc/raddb/modules/chap
 Module: Linked to module rlm_mschap
 Module: Instantiating module "mschap" from file /etc/raddb/modules/mschap
  mschap {
        use_mppe = yes
        require_encryption = no
        require_strong = no
        with_ntdomain_hack = no
  }
 Module: Instantiating module "ntlm_auth" from file /etc/raddb/modules/ntlm_auth
  exec ntlm_auth {
        wait = yes
        program = "/usr/bin/ntlm_auth --request-nt-key --domain=MYREALDOMAIN-OMMITTED --username=%{mschap:User-Name} --password=%{User-Password}"
        input_pairs = "request"
        shell_escape = yes
  }
 Module: Linked to module rlm_unix
 Module: Instantiating module "unix" from file /etc/raddb/modules/unix
  unix {
        radwtmp = "/var/log/radius/radwtmp"
  }
 Module: Linked to module rlm_eap
 Module: Instantiating module "eap" from file /etc/raddb/eap.conf
  eap {
        default_eap_type = "md5"
        timer_expire = 60
        ignore_unknown_eap_types = no
        cisco_accounting_username_bug = no
        max_sessions = 4096
  }
 Module: Linked to sub-module rlm_eap_md5
 Module: Instantiating eap-md5
 Module: Linked to sub-module rlm_eap_leap
 Module: Instantiating eap-leap
 Module: Linked to sub-module rlm_eap_gtc
 Module: Instantiating eap-gtc
   gtc {
        challenge = "Password: "
        auth_type = "PAP"
   }
 Module: Linked to sub-module rlm_eap_tls
 Module: Instantiating eap-tls
   tls {
        rsa_key_exchange = no
        dh_key_exchange = yes
        rsa_key_length = 512
        dh_key_length = 512
        verify_depth = 0
        CA_path = "/etc/raddb/certs"
        pem_file_type = yes
        private_key_file = "/etc/raddb/certs/server.pem"
        certificate_file = "/etc/raddb/certs/server.pem"
        CA_file = "/etc/raddb/certs/ca.pem"
        private_key_password = "whatever"
        dh_file = "/etc/raddb/certs/dh"
        random_file = "/etc/raddb/certs/random"
        fragment_size = 1024
        include_length = yes
        check_crl = no
        cipher_list = "DEFAULT"
    cache {
        enable = no
        lifetime = 24
        max_entries = 255
    }
    verify {
    }
   }
 Module: Linked to sub-module rlm_eap_ttls
 Module: Instantiating eap-ttls
   ttls {
        default_eap_type = "md5"
        copy_request_to_tunnel = no
        use_tunneled_reply = no
        virtual_server = "inner-tunnel"
        include_length = yes
   }
 Module: Linked to sub-module rlm_eap_peap
 Module: Instantiating eap-peap
   peap {
        default_eap_type = "mschapv2"
        copy_request_to_tunnel = no
        use_tunneled_reply = no
        proxy_tunneled_request_as_eap = yes
        virtual_server = "inner-tunnel"
   }
 Module: Linked to sub-module rlm_eap_mschapv2
 Module: Instantiating eap-mschapv2
   mschapv2 {
        with_ntdomain_hack = no
   }
 Module: Checking authorize {...} for more modules to load
 Module: Linked to module rlm_realm
 Module: Instantiating module "suffix" from file /etc/raddb/modules/realm
  realm suffix {
        format = "suffix"
        delimiter = "@"
        ignore_default = no
        ignore_null = no
  }
 Module: Linked to module rlm_files
 Module: Instantiating module "files" from file /etc/raddb/modules/files
  files {
        usersfile = "/etc/raddb/users"
        acctusersfile = "/etc/raddb/acct_users"
        preproxy_usersfile = "/etc/raddb/preproxy_users"
        compat = "no"
  }
 Module: Checking session {...} for more modules to load
 Module: Linked to module rlm_radutmp
 Module: Instantiating module "radutmp" from file /etc/raddb/modules/radutmp
  radutmp {
        filename = "/var/log/radius/radutmp"
        username = "%{User-Name}"
        case_sensitive = yes
        check_with_nas = yes
        perm = 384
        callerid = yes
  }
 Module: Checking post-proxy {...} for more modules to load
 Module: Checking post-auth {...} for more modules to load
 Module: Linked to module rlm_attr_filter
 Module: Instantiating module "attr_filter.access_reject" from file /etc/raddb/modules/attr_filter
  attr_filter attr_filter.access_reject {
        attrsfile = "/etc/raddb/attrs.access_reject"
        key = "%{User-Name}"
  }
 } # modules
} # server
server { # from file /etc/raddb/radiusd.conf
 modules {
 Module: Checking authenticate {...} for more modules to load
 Module: Linked to module rlm_digest
 Module: Instantiating module "digest" from file /etc/raddb/modules/digest
 Module: Checking authorize {...} for more modules to load
 Module: Linked to module rlm_preprocess
 Module: Instantiating module "preprocess" from file /etc/raddb/modules/preprocess
  preprocess {
        huntgroups = "/etc/raddb/huntgroups"
        hints = "/etc/raddb/hints"
        with_ascend_hack = no
        ascend_channels_per_line = 23
        with_ntdomain_hack = no
        with_specialix_jetstream_hack = no
        with_cisco_vsa_hack = no
        with_alvarion_vsa_hack = no
  }
 Module: Checking preacct {...} for more modules to load
 Module: Linked to module rlm_acct_unique
 Module: Instantiating module "acct_unique" from file /etc/raddb/modules/acct_unique
  acct_unique {
        key = "User-Name, Acct-Session-Id, NAS-IP-Address, Client-IP-Address, NAS-Port"
  }
 Module: Checking accounting {...} for more modules to load
 Module: Linked to module rlm_detail
 Module: Instantiating module "detail" from file /etc/raddb/modules/detail
  detail {
        detailfile = "/var/log/radius/radacct/%{Client-IP-Address}/detail-%Y%m%d"
        header = "%t"
        detailperm = 384
        dirperm = 493
        locking = no
        log_packet_header = no
  }
 Module: Instantiating module "attr_filter.accounting_response" from file /etc/raddb/modules/attr_filter
  attr_filter attr_filter.accounting_response {
        attrsfile = "/etc/raddb/attrs.accounting_response"
        key = "%{User-Name}"
  }
 Module: Checking session {...} for more modules to load
 Module: Checking post-proxy {...} for more modules to load
 Module: Checking post-auth {...} for more modules to load
 } # modules
} # server
radiusd: #### Opening IP addresses and Ports ####
listen {
        type = "auth"
        ipaddr = *
        port = 0
}
listen {
        type = "acct"
        ipaddr = *
        port = 0
}
listen {
        type = "control"
 listen {
        socket = "/var/run/radiusd/radiusd.sock"
 }
}
listen {
        type = "auth"
        ipaddr = 127.0.0.1
        port = 18120
}
Listening on authentication address * port 1812
Listening on accounting address * port 1813
Listening on command file /var/run/radiusd/radiusd.sock
Listening on authentication address 127.0.0.1 port 18120 as server inner-tunnel
Listening on proxy address * port 1814
Ready to process requests.

**************************************************************************************************

**************************************************************************************************

**************************************************************************************************

END RADIUSD -X DEBUG OUTPUT

Jim C. Julson
Sr. Network & Systems Administrator
C 208.908.1476
jjulson@marketron.com<mailto:jjulson@marketron.com>
[www.marketron.com]<http://www.marketron.com>

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Can't figure out Group Authentication

Julson, Jim