Using return-output from external script as reply-message

4 Mar 2013

      Hello.

I want to use an external script (multiotp) for authentication in
FreeRADIUS.

I created a new module called multiotp that starts the external script...

exec multiotp {
        wait = yes
        input_pairs = request
        output_pairs = reply
        program = "/etc/freeradius/multiotp/multiotp.php -log -debug
'%{User-Name}' '%{User-Password}'"
        shell_escape = yes
}

...and activated this module in the authentication-section of the
default-configuration (and also in the inner-tunnel-configuration):

authenticate {
[...]
        Auth-Type MultiOTP {
                update reply {
                        Reply-Message = "Hello, %{User-Name}"
                }
                multiotp
        }
[...]
}

The external script gives me additional informations (like "OK: Token
accepted", "INFO: Authentication failed" etc.) after authentication.

When I run freeradius in debug mode, I can see the output-message from
the external script:
[...]
Exec-Program output: 0 OK: Token accepted
Exec-Program-Wait: plaintext: 0 OK: Token accepted
Exec-Program: returned: 0
++[multiotp] returns ok
Login OK: [test] (from client localhost port 0)
[...]

Is it possible to use this output-message as the reply-message ?

Thanks.

Stefan

P.S.
This is the complete output from freeradius -X:

/usr/sbin/freeradius -X
FreeRADIUS Version 2.1.10, for host x86_64-pc-linux-gnu, built on Sep 11
2012 at 17:06:46
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/freeradius/radiusd.conf
including configuration file /etc/freeradius/proxy.conf
including configuration file /etc/freeradius/clients.conf
including files in directory /etc/freeradius/modules/
including configuration file /etc/freeradius/modules/detail.example.com
including configuration file /etc/freeradius/modules/mac2ip
including configuration file /etc/freeradius/modules/checkval
including configuration file /etc/freeradius/modules/sql_log
including configuration file /etc/freeradius/modules/opendirectory
including configuration file /etc/freeradius/modules/radutmp
including configuration file /etc/freeradius/modules/exec
including configuration file /etc/freeradius/modules/digest
including configuration file
/etc/freeradius/modules/sqlcounter_expire_on_login
including configuration file /etc/freeradius/modules/policy
including configuration file /etc/freeradius/modules/mac2vlan
including configuration file /etc/freeradius/modules/realm
including configuration file /etc/freeradius/modules/expr
including configuration file /etc/freeradius/modules/preprocess
including configuration file /etc/freeradius/modules/logintime
including configuration file /etc/freeradius/modules/files
including configuration file /etc/freeradius/modules/otp
including configuration file /etc/freeradius/modules/dynamic_clients
including configuration file /etc/freeradius/modules/detail
including configuration file /etc/freeradius/modules/ippool
including configuration file /etc/freeradius/modules/unix
including configuration file /etc/freeradius/modules/passwd
including configuration file /etc/freeradius/modules/etc_group
including configuration file /etc/freeradius/modules/smbpasswd
including configuration file /etc/freeradius/modules/chap
including configuration file /etc/freeradius/modules/krb5
including configuration file /etc/freeradius/modules/cui
including configuration file /etc/freeradius/modules/pap
including configuration file /etc/freeradius/modules/acct_unique
including configuration file /etc/freeradius/modules/linelog
including configuration file /etc/freeradius/modules/wimax
including configuration file /etc/freeradius/modules/echo
including configuration file /etc/freeradius/modules/attr_rewrite
including configuration file /etc/freeradius/modules/pam
including configuration file /etc/freeradius/modules/expiration
including configuration file /etc/freeradius/modules/attr_filter
including configuration file /etc/freeradius/modules/ldap
including configuration file /etc/freeradius/modules/multiotp
including configuration file /etc/freeradius/modules/smsotp
including configuration file /etc/freeradius/modules/mschap
including configuration file /etc/freeradius/modules/always
including configuration file /etc/freeradius/modules/detail.log
including configuration file /etc/freeradius/modules/perl
including configuration file /etc/freeradius/modules/sradutmp
including configuration file /etc/freeradius/modules/counter
including configuration file /etc/freeradius/modules/ntlm_auth
including configuration file /etc/freeradius/modules/inner-eap
including configuration file /etc/freeradius/eap.conf
including configuration file /etc/freeradius/policy.conf
including files in directory /etc/freeradius/sites-enabled/
including configuration file /etc/freeradius/sites-enabled/default
including configuration file /etc/freeradius/sites-enabled/inner-tunnel
main {
        user = "freerad"
        group = "freerad"
        allow_core_dumps = no
}
including dictionary file /etc/freeradius/dictionary
main {
        prefix = "/usr"
        localstatedir = "/var"
        logdir = "/var/log/freeradius"
        libdir = "/usr/lib/freeradius"
        radacctdir = "/var/log/freeradius/radacct"
        hostname_lookups = no
        max_request_time = 30
        cleanup_delay = 5
        max_requests = 1024
        pidfile = "/var/run/freeradius/freeradius.pid"
        checkrad = "/usr/sbin/checkrad"
        debug_level = 0
        proxy_requests = yes
 log {
        stripped_names = no
        auth = yes
        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 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/freeradius/modules/exec
  exec {
        wait = no
        input_pairs = "request"
        shell_escape = yes
  }
 Module: Linked to module rlm_expr
 Module: Instantiating module "expr" from file /etc/freeradius/modules/expr
 Module: Linked to module rlm_expiration
 Module: Instantiating module "expiration" from file
/etc/freeradius/modules/expiration
  expiration {
        reply-message = "Password Has Expired  "
  }
 Module: Linked to module rlm_logintime
 Module: Instantiating module "logintime" from file
/etc/freeradius/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/freeradius/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/freeradius/modules/pap
  pap {
        encryption_scheme = "auto"
        auto_header = no
  }
 Module: Linked to module rlm_chap
 Module: Instantiating module "chap" from file /etc/freeradius/modules/chap
 Module: Linked to module rlm_mschap
 Module: Instantiating module "mschap" from file
/etc/freeradius/modules/mschap
  mschap {
        use_mppe = yes
        require_encryption = no
        require_strong = no
        with_ntdomain_hack = no
  }
 Module: Linked to module rlm_pam
 Module: Instantiating module "pam" from file /etc/freeradius/modules/pam
  pam {
        pam_auth = "radiusd"
  }
 Module: Linked to module rlm_unix
 Module: Instantiating module "unix" from file /etc/freeradius/modules/unix
  unix {
        radwtmp = "/var/log/freeradius/radwtmp"
  }
 Module: Linked to module rlm_eap
 Module: Instantiating module "eap" from file /etc/freeradius/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/freeradius/certs"
        pem_file_type = yes
        private_key_file = "/etc/freeradius/certs/server.key"
        certificate_file = "/etc/freeradius/certs/server.pem"
        CA_file = "/etc/freeradius/certs/ca.pem"
        private_key_password = "whatever"
        dh_file = "/etc/freeradius/certs/dh"
        random_file = "/dev/urandom"
        fragment_size = 1024
        include_length = yes
        check_crl = no
        cipher_list = "DEFAULT"
        make_cert_command = "/etc/freeradius/certs/bootstrap"
    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: Instantiating module "multiotp" from file
/etc/freeradius/modules/multiotp
  exec multiotp {
        wait = yes
        program = "/etc/freeradius/multiotp/multiotp.php -log -debug
'%{User-Name}' '%{User-Password}'"
        input_pairs = "request"
        output_pairs = "reply"
        shell_escape = yes
  }
 Module: Checking authorize {...} for more modules to load
 Module: Linked to module rlm_realm
 Module: Instantiating module "suffix" from file
/etc/freeradius/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/freeradius/modules/files
  files {
        usersfile = "/etc/freeradius/users"
        acctusersfile = "/etc/freeradius/acct_users"
        preproxy_usersfile = "/etc/freeradius/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/freeradius/modules/radutmp
  radutmp {
        filename = "/var/log/freeradius/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/freeradius/modules/attr_filter
  attr_filter attr_filter.access_reject {
        attrsfile = "/etc/freeradius/attrs.access_reject"
        key = "%{User-Name}"
  }
 } # modules
} # server
server { # from file /etc/freeradius/radiusd.conf
 modules {
 Module: Checking authenticate {...} for more modules to load
 Module: Linked to module rlm_digest
 Module: Instantiating module "digest" from file
/etc/freeradius/modules/digest
 Module: Checking authorize {...} for more modules to load
 Module: Linked to module rlm_preprocess
 Module: Instantiating module "preprocess" from file
/etc/freeradius/modules/preprocess
  preprocess {
        huntgroups = "/etc/freeradius/huntgroups"
        hints = "/etc/freeradius/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/freeradius/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/freeradius/modules/detail
  detail {
        detailfile =
"/var/log/freeradius/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/freeradius/modules/attr_filter
  attr_filter attr_filter.accounting_response {
        attrsfile = "/etc/freeradius/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 = 1812
}
listen {
        type = "acct"
        ipaddr = *
        port = 1813
}
listen {
        type = "auth"
        ipaddr = 127.0.0.1
        port = 18120
}
Listening on authentication address * port 1812
Listening on accounting address * port 1813
Listening on authentication address 127.0.0.1 port 18120 as server
inner-tunnel
Listening on proxy address * port 1814
Ready to process requests.
rad_recv: Access-Request packet from host 127.0.0.1 port 44170, id=173,
length=58
        User-Name = "test"
        User-Password = "1234350368"
        NAS-IP-Address = 127.0.0.1
        NAS-Port = 0
# Executing section authorize from file
/etc/freeradius/sites-enabled/default
+- entering group authorize {...}
++[preprocess] returns ok
++[chap] returns noop
++[mschap] returns noop
++[digest] returns noop
[suffix] No '@' in User-Name = "test", looking up realm NULL
[suffix] No such realm "NULL"
++[suffix] returns noop
[eap] No EAP-Message, not doing EAP
++[eap] returns noop
[files] users: Matched entry test at line 1
++[files] returns ok
++[expiration] returns noop
++[logintime] returns noop
[pap] WARNING! No "known good" password found for the user.
Authentication may fail because of this.
++[pap] returns noop
Found Auth-Type = MultiOTP
# Executing group from file /etc/freeradius/sites-enabled/default
+- entering group MultiOTP {...}
        expand: Hello, %{User-Name} -> Hello, test
++[reply] returns reject
[multiotp]      expand: '%{User-Name}' -> 'test'
[multiotp]      expand: '%{User-Password}' -> '1234350368'
Exec-Program output: 0 OK: Token accepted
Exec-Program-Wait: plaintext: 0 OK: Token accepted
Exec-Program: returned: 0
++[multiotp] returns ok
Login OK: [test] (from client localhost port 0)
# Executing section post-auth from file
/etc/freeradius/sites-enabled/default
+- entering group post-auth {...}
++[exec] returns noop
Sending Access-Accept of id 173 to 127.0.0.1 port 44170
        Class = 0x56504e2d53797374656d696e746567726174696f6e
        Reply-Message = "Hello, test"
Finished request 0.
Going to the next request
Waking up in 4.9 seconds.
Cleaning up request 0 ID 173 with timestamp +38
Ready to process requests.

Using return-output from external script as reply-message

Stefan Kuegler