Problem with external authentication script
Stefan Kuegler
freeradius at kuegler.org
Sun Jun 7 21:57:14 CEST 2009
Hello.
I have some trouble to call an external authentication script in freeradius.
I want to use MOTP for authentication. MOTP uses a shell-script
(/usr/local/bin/otpverify.sh) to verify the given password. The script
needs five arguments (User, One-Time-Password, Secret, PIN and Offset).
My system is a fresh installation of freeradius on a Debian/Lenny system.
I did the following changes on the following config-files:
1. A new dictionary-file (included in /etc/freeradius/dictionary):
/etc/freeradius/dictionary.motp
-------------------------------
ATTRIBUTE Secret 960 string
ATTRIBUTE PIN 961 string
ATTRIBUTE Offset 962 string
2. A new module in
/etc/freeradius/radiusd.conf (modules-section):
----------------------------
[...]
exec motp {
wait = yes
program = "/usr/local/bin/otpverify.sh %{User-Name}
%{User-Password} %{Secret} %{PIN} %{Offset}"
input_pairs = request
output_pairs = config
}
[...]
3. /etc/freeradius/sites-enabled/default (section authenticate)
-------------------------------------
[...]
Auth-Type MOTP {
motp
}
4. /etc/freeradius/users
---------------------
DEFAULT Auth-Type = Accept
Exec-Program-Wait = "/usr/local/bin/otpverify.sh '%{User-Name}'
'%{User-Password}' '%{Secret}' '%{PIN}' '%{Offset}'",
Fall-Through = Yes
stefan
Secret = 143a5c6fa125ac1f,
PIN = 1234,
Offset = 0
The main-problem is: freeradius didn't call the script with all the
needed arguments - so the authentication failes:
[...]
expand: /usr/local/bin/otpverify.sh '%{User-Name}'
'%{User-Password}' '%{Secret}' '%{PIN}' '%{Offset}' ->
/usr/local/bin/otpverify.sh 'stefan' '123' '' '' ''
[...]
Can anybody tell me where I did the mistake in my configuration ??
Thanks a lot
Stefan
P.S.
Here is the complete debugging output:
FreeRADIUS Version 2.0.4, for host x86_64-pc-linux-gnu, built on Sep 7
2008 at 17:42:33
Copyright (C) 1999-2008 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.
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 configuration file /etc/freeradius/snmp.conf
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
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
allow_core_dumps = no
pidfile = "/var/run/freeradius/freeradius.pid"
user = "freerad"
group = "freerad"
checkrad = "/usr/sbin/checkrad"
debug_level = 0
proxy_requests = yes
security {
max_attributes = 200
reject_delay = 1
status_server = yes
}
}
client localhost {
ipaddr = 127.0.0.1
require_message_authenticator = no
secret = "testing123"
nastype = "other"
}
client 192.168.82.41 {
require_message_authenticator = no
secret = "testing123"
}
client 192.168.82.40 {
require_message_authenticator = no
secret = "testing123"
}
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
zombie_period = 40
status_check = "status-server"
ping_check = "none"
ping_interval = 30
check_interval = 30
num_answers_to_alive = 3
num_pings_to_alive = 3
revive_interval = 120
status_check_timeout = 4
}
home_server_pool my_auth_failover {
type = fail-over
home_server = localhost
}
realm example.com {
auth_pool = my_auth_failover
}
realm LOCAL {
}
radiusd: #### Instantiating modules ####
instantiate {
Module: Linked to module rlm_exec
Module: Instantiating exec
exec {
wait = yes
input_pairs = "request"
shell_escape = yes
}
Module: Linked to module rlm_expr
Module: Instantiating expr
Module: Linked to module rlm_expiration
Module: Instantiating expiration
expiration {
reply-message = "Password Has Expired "
}
Module: Linked to module rlm_logintime
Module: Instantiating logintime
logintime {
reply-message = "You are calling outside your allowed timespan "
minimum-timeout = 60
}
}
radiusd: #### Loading Virtual Servers ####
server inner-tunnel {
modules {
Module: Checking authenticate {...} for more modules to load
Module: Instantiating motp
exec motp {
wait = yes
program = "/usr/local/bin/otpverify.sh %{User-Name}
%{User-Password} %{Secret} %{PIN} %{Offset}"
input_pairs = "request"
output_pairs = "config"
shell_escape = yes
}
Module: Linked to module rlm_pap
Module: Instantiating pap
pap {
encryption_scheme = "auto"
auto_header = no
}
Module: Linked to module rlm_chap
Module: Instantiating chap
Module: Linked to module rlm_mschap
Module: Instantiating mschap
mschap {
use_mppe = yes
require_encryption = no
require_strong = no
with_ntdomain_hack = no
}
Module: Linked to module rlm_unix
Module: Instantiating unix
unix {
radwtmp = "/var/log/freeradius/radwtmp"
}
Module: Linked to module rlm_eap
Module: Instantiating eap
eap {
default_eap_type = "md5"
timer_expire = 60
ignore_unknown_eap_types = no
cisco_accounting_username_bug = no
}
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"
}
rlm_eap: Ignoring EAP-Type/tls because we do not have OpenSSL support.
rlm_eap: Ignoring EAP-Type/ttls because we do not have OpenSSL support.
rlm_eap: Ignoring EAP-Type/peap because we do not have OpenSSL support.
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 suffix
realm suffix {
format = "suffix"
delimiter = "@"
ignore_default = no
ignore_null = no
}
Module: Linked to module rlm_files
Module: Instantiating 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 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 attr_filter.access_reject
attr_filter attr_filter.access_reject {
attrsfile = "/etc/freeradius/attrs.access_reject"
key = "%{User-Name}"
}
}
}
server {
modules {
Module: Checking authenticate {...} for more modules to load
Module: Checking authorize {...} for more modules to load
Module: Linked to module rlm_preprocess
Module: Instantiating 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 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 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 attr_filter.accounting_response
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
}
}
radiusd: #### Opening IP addresses and Ports ####
listen {
type = "auth"
ipaddr = *
port = 0
}
listen {
type = "acct"
ipaddr = *
port = 0
}
main {
snmp = no
smux_password = ""
snmp_write_access = no
}
Listening on authentication address * port 1812
Listening on accounting address * port 1813
Listening on proxy address * port 1814
Ready to process requests.
rad_recv: Access-Request packet from host 192.168.82.40 port 1026,
id=43, length=78
User-Name = "stefan"
User-Password = "123"
Service-Type = Authenticate-Only
NAS-Identifier = "ubuntu.kuegler.org"
NAS-IP-Address = 192.168.82.40
+- entering group authorize
++[preprocess] returns ok
++[chap] returns noop
++[mschap] returns noop
rlm_realm: No '@' in User-Name = "stefan", looking up realm NULL
rlm_realm: No such realm "NULL"
++[suffix] returns noop
rlm_eap: No EAP-Message, not doing EAP
++[eap] returns noop
++[unix] returns updated
users: Matched entry DEFAULT at line 2
expand: /usr/local/bin/otpverify.sh '%{User-Name}'
'%{User-Password}' '%{Secret}' '%{PIN}' '%{Offset}' ->
/usr/local/bin/otpverify.sh 'stefan' '123' '' '' ''
users: Matched entry stefan at line 9
++[files] returns ok
++[expiration] returns noop
++[logintime] returns noop
rlm_pap: Found existing Auth-Type, not changing it.
++[pap] returns noop
rad_check_password: Found Auth-Type Accept
rad_check_password: Auth-Type = Accept, accepting the user
Login OK: [stefan/123] (from client 192.168.82.40 port 0)
+- entering group post-auth
Exec-Program output: FAIL
Exec-Program-Wait: plaintext: FAIL
Exec-Program: returned: 3
Login incorrect (external check said so)
++[exec] returns reject
Found Post-Auth-Type Reject
+- entering group REJECT
expand: %{User-Name} -> stefan
attr_filter: Matched entry DEFAULT at line 11
++[attr_filter.access_reject] returns updated
Delaying reject of request 0 for 1 seconds
Going to the next request
Waking up in 0.9 seconds.
rad_recv: Access-Request packet from host 192.168.82.40 port 1026,
id=43, length=78
Waiting to send Access-Reject to client 192.168.82.40 port 1026 - ID: 43
Sending delayed reject for request 0
Sending Access-Reject of id 43 to 192.168.82.40 port 1026
Waking up in 4.9 seconds.
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