ntlm_auth and clear-text passwords

robiwan at arcor.de robiwan at arcor.de
Mon Jul 3 10:38:27 CEST 2006


Dear all,

For AAA-Authenticating on a Cisco Catalyst Switch 3750, i try to use use the ntlm_auth to authenticate users against our Active Directory (domain-name: SOUTH). Users telnet the switch, therefore a clear-text password will be sent. 

according to an earlier posting http://lists.freeradius.org/mailman/htdig/freeradius-users/2005-July/045377.html

i did this:

> What you need to do is to configure a *different* ntlm_auth, only
> for clear-text passwords.  The simplest way to do this is to use the
> "exec" module:
>
> modules {
>	...
>	exec win_domain {
>	     wait = yes
>	     input_pairs = request
>	     output_pairs = reply
>	     program = "ntlm_auth --username=\"%{User-Name}\" --password=\"%{User-Password}\" --domain=usmisgne"
>	}
>	...
> } 
>
>  Now list "win_domain" in the "authenticate" section, and add the
> following entry to the "users" file:
>
> DEFAULT	  Auth-Type = win_domain
>

But the authentication still fails.

My ntlm_auth shell-command works:

~# /usr/bin/ntlm_auth --username="john.smith" --password='smith1000' --domain=SOUTH
NT_STATUS_OK: Success (0x0)

....but authentication via freeradius fails.

Here are my config files and the complete freeradius -X output:

my radiusd.conf file:
-----------------------------
prefix = /usr
exec_prefix = /usr
sysconfdir = /etc
localstatedir = /var
sbindir = ${exec_prefix}/sbin
logdir = /var/log/freeradius
raddbdir = /etc/freeradius
radacctdir = ${logdir}/radacct
confdir = ${raddbdir}
run_dir = ${localstatedir}/run/freeradius
log_file = ${logdir}/radius.log
libdir = /usr/lib/freeradius
pidfile = ${run_dir}/freeradius.pid
max_request_time = 30
delete_blocked_requests = no
cleanup_delay = 5
max_requests = 1024
bind_address = *
port = 0
hostname_lookups = no
allow_core_dumps = no
regular_expressions     = yes
extended_expressions    = yes
log_stripped_names = yes
log_auth = yes
log_auth_badpass = yes
log_auth_goodpass = yes
usercollide = no
lower_user = no
lower_pass = no
nospace_user = no
nospace_pass = no
checkrad = ${sbindir}/checkrad
security {
        max_attributes = 200
        reject_delay = 1
        status_server = no
}
proxy_requests  = yes
$INCLUDE  ${confdir}/proxy.conf
$INCLUDE  ${confdir}/clients.conf
snmp    = no
$INCLUDE  ${confdir}/snmp.conf
thread pool {
        start_servers = 5
        max_servers = 32
        min_spare_servers = 3
        max_spare_servers = 10
        max_requests_per_server = 0
}
modules {
        pap {
                encryption_scheme = crypt
        }
        chap {
                authtype = CHAP
        }
        pam {
                pam_auth = radiusd
        }
        unix {
                cache = no
                cache_reload = 600
                shadow = /etc/shadow
                radwtmp = ${logdir}/radwtmp
        }
$INCLUDE ${confdir}/eap.conf
        mschap {
                authtype = MS-CHAP
                use_mppe = no
                require_encryption = yes
                require_strong = yes
                with_ntdomain_hack = yes
                ntlm_auth = "/usr/bin/ntlm_auth --request-nt-key --domain=%{mschap:NT-Domain} --username=%{mschap:User-Name} --challenge=%{mschap:Challenge} --nt-response=%{mschap:NT-Response}"
        }
        ldap {
                server = "10.187.64.3"
                identity = "CN=Hans Dampf,CN=Computers,DC=winlab,DC=rsnhm,DC=t-com,DC=de"
                password = Gerti1000
                basedn = "DC=winlab,DC=rsnhm,DC=t-com,DC=de"
                filter = "sAMAccountname=%{User-Name}"
                start_tls = no
                dictionary_mapping = ${raddbdir}/ldap.attrmap
                ldap_connections_number = 5
                edir_account_policy_check=no
                timeout = 4
                timelimit = 3
                net_timeout = 1
        }
        realm IPASS {
                format = prefix
                delimiter = "/"
                ignore_default = no
                ignore_null = no
        }
        realm suffix {
                format = suffix
                delimiter = "@"
                ignore_default = no
                ignore_null = no
        }
        realm realmpercent {
                format = suffix
                delimiter = "%"
                ignore_default = no
                ignore_null = no
        }
        realm ntdomain {
                format = prefix
                delimiter = "\\"
                ignore_default = no
                ignore_null = no
        }
        checkval {
                item-name = Calling-Station-Id
                check-name = Calling-Station-Id
                data-type = string
        }
        preprocess {
                huntgroups = ${confdir}/huntgroups
                hints = ${confdir}/hints
                with_ascend_hack = no
                ascend_channels_per_line = 23
                with_ntdomain_hack = no
                with_specialix_jetstream_hack = no
                with_cisco_vsa_hack = no
        }
        files {
                usersfile = ${confdir}/users
                acctusersfile = ${confdir}/acct_users
                preproxy_usersfile = ${confdir}/preproxy_users
                compat = no
        }
        detail {
                detailfile = ${radacctdir}/%{Client-IP-Address}/detail-%Y%m%d
                detailperm = 0600
        }
         detail auth_log {
                 detailfile = ${radacctdir}/%{Client-IP-Address}/auth-detail-%Y%m%d
                 detailperm = 0600
         }
        acct_unique {
                key = "User-Name, Acct-Session-Id, NAS-IP-Address, Client-IP-Address, NAS-Port"
        }
        $INCLUDE  ${confdir}/sql.conf
        radutmp {
                filename = ${logdir}/radutmp
                username = %{User-Name}
                case_sensitive = yes
                check_with_nas = yes
                perm = 0600
                callerid = "yes"
        }
        radutmp sradutmp {
                filename = ${logdir}/sradutmp
                perm = 0644
                callerid = "no"
        }
        attr_filter {
                attrsfile = ${confdir}/attrs
        }
        counter daily {
                filename = ${raddbdir}/db.daily
                key = User-Name
                count-attribute = Acct-Session-Time
                reset = daily
                counter-name = Daily-Session-Time
                check-name = Max-Daily-Session
                allowed-servicetype = Framed-User
                cache-size = 5000
        }
        sqlcounter dailycounter {
                counter-name = Daily-Session-Time
                check-name = Max-Daily-Session
                sqlmod-inst = sql
                key = User-Name
                reset = daily
                query = "SELECT SUM(AcctSessionTime - \
                 GREATEST((%b - UNIX_TIMESTAMP(AcctStartTime)), 0)) \
                 FROM radacct WHERE UserName='%{%k}' AND \
                 UNIX_TIMESTAMP(AcctStartTime) + AcctSessionTime > '%b'"
        }
        sqlcounter monthlycounter {
                counter-name = Monthly-Session-Time
                check-name = Max-Monthly-Session
                sqlmod-inst = sql
                key = User-Name
                reset = monthly
                query = "SELECT SUM(AcctSessionTime - \
                 GREATEST((%b - UNIX_TIMESTAMP(AcctStartTime)), 0)) \
                 FROM radacct WHERE UserName='%{%k}' AND \
                 UNIX_TIMESTAMP(AcctStartTime) + AcctSessionTime > '%b'"
        }
        always fail {
                rcode = fail
        }
        always reject {
                rcode = reject
        }
        always ok {
                rcode = ok
                simulcount = 0
                mpp = no
        }
        expr {
        }
        digest {
        }
        exec {
                wait = yes
                input_pairs = request
        }
        exec echo {
                wait = yes
                program = "/bin/echo %{User-Name}"
                input_pairs = request
                output_pairs = reply
        }
        exec win_domain {
          wait = yes
          input_pairs = request
          output_pairs = reply
          program = "/usr/bin/ntlm_auth --username=\"%{User-Name}\" --password=\'%{User-Password}\' --domain=SOUTH"
        }
        ippool main_pool {
                range-start = 192.168.1.1
                range-stop = 192.168.3.254
                netmask = 255.255.255.0
                cache-size = 800
                session-db = ${raddbdir}/db.ippool
                ip-index = ${raddbdir}/db.ipindex
                override = no
                maximum-timeout = 0
        }
}
instantiate {
        exec
        expr
}
authorize {
        preprocess
        chap
        mschap
        suffix
        eap
        files
        ldap
}
authenticate {
        Auth-Type PAP {
                pap
        }
        Auth-Type CHAP {
                chap
        }
        Auth-Type MS-CHAP {
                mschap
        }
        unix
        Auth-Type LDAP {
                ldap
        }
        eap
        Auth-Type win_domain{
          win_domain
        }
}
preacct {
        preprocess
        acct_unique
        suffix
        files
}
accounting {
        detail
        unix
        radutmp
}
session {
        radutmp
}
post-auth {
}
pre-proxy {
}
post-proxy {
        eap
}

here is my users file
----------------------------

hugo       User-Password == "hugo01"
                Service-Type = Login,
                Cisco-AVPair = "shell:priv-lvl=1"

DEFAULT   Auth-Type = win_domain

freeradius -X
---------------------
freeradius -X
Starting - reading configuration files ...
reread_config:  reading radiusd.conf
Config:   including file: /etc/freeradius/proxy.conf
Config:   including file: /etc/freeradius/clients.conf
Config:   including file: /etc/freeradius/snmp.conf
Config:   including file: /etc/freeradius/eap.conf
Config:   including file: /etc/freeradius/sql.conf
 main: prefix = "/usr"
 main: localstatedir = "/var"
 main: logdir = "/var/log/freeradius"
 main: libdir = "/usr/lib/freeradius"
 main: radacctdir = "/var/log/freeradius/radacct"
 main: hostname_lookups = no
 main: snmp = no
 main: max_request_time = 30
 main: cleanup_delay = 5
 main: max_requests = 1024
 main: delete_blocked_requests = 0
 main: port = 0
 main: allow_core_dumps = no
 main: log_stripped_names = yes
 main: log_file = "/var/log/freeradius/radius.log"
 main: log_auth = yes
 main: log_auth_badpass = yes
 main: log_auth_goodpass = yes
 main: pidfile = "/var/run/freeradius/freeradius.pid"
 main: user = "(null)"
 main: group = "(null)"
 main: usercollide = no
 main: lower_user = "no"
 main: lower_pass = "no"
 main: nospace_user = "no"
 main: nospace_pass = "no"
 main: checkrad = "/usr/sbin/checkrad"
 main: proxy_requests = yes
 proxy: retry_delay = 5
 proxy: retry_count = 3
 proxy: synchronous = no
 proxy: default_fallback = yes
 proxy: dead_time = 120
 proxy: post_proxy_authorize = no
 proxy: wake_all_if_all_dead = no
 security: max_attributes = 200
 security: reject_delay = 1
 security: status_server = no
 main: debug_level = 0
read_config_files:  reading dictionary
read_config_files:  reading naslist
Using deprecated naslist file.  Support for this will go away soon.
read_config_files:  reading clients
read_config_files:  reading realms
radiusd:  entering modules setup
Module: Library search path is /usr/lib/freeradius
Module: Loaded exec
 exec: wait = yes
 exec: program = "(null)"
 exec: input_pairs = "request"
 exec: output_pairs = "(null)"
 exec: packet_type = "(null)"
rlm_exec: Wait=yes but no output defined. Did you mean output=none?
Module: Instantiated exec (exec)
Module: Loaded expr
Module: Instantiated expr (expr)
Module: Loaded PAP
 pap: encryption_scheme = "crypt"
Module: Instantiated pap (pap)
Module: Loaded CHAP
Module: Instantiated chap (chap)
Module: Loaded MS-CHAP
 mschap: use_mppe = no
 mschap: require_encryption = yes
 mschap: require_strong = yes
 mschap: with_ntdomain_hack = yes
 mschap: passwd = "(null)"
 mschap: authtype = "MS-CHAP"
 mschap: ntlm_auth = "/usr/bin/ntlm_auth --request-nt-key --domain=%{mschap:NT-Domain} --username=%{mschap:User-Name} --challenge=%{mschap:Challenge} --nt-response=%{mschap:NT-Response}"
Module: Instantiated mschap (mschap)
Module: Loaded System
 unix: cache = no
 unix: passwd = "(null)"
 unix: shadow = "/etc/shadow"
 unix: group = "(null)"
 unix: radwtmp = "/var/log/freeradius/radwtmp"
 unix: usegroup = no
 unix: cache_reload = 600
Module: Instantiated unix (unix)
Module: Loaded LDAP
 ldap: server = "10.187.64.3"
 ldap: port = 389
 ldap: net_timeout = 1
 ldap: timeout = 4
 ldap: timelimit = 3
 ldap: identity = "CN=Hans Dampf,CN=Computers,DC=winlab,DC=rsnhm,DC=t-com,DC=de"
 ldap: tls_mode = no
 ldap: start_tls = no
 ldap: tls_cacertfile = "(null)"
 ldap: tls_cacertdir = "(null)"
 ldap: tls_certfile = "(null)"
 ldap: tls_keyfile = "(null)"
 ldap: tls_randfile = "(null)"
 ldap: tls_require_cert = "allow"
 ldap: password = "Gerti1000"
 ldap: basedn = "DC=winlab,DC=rsnhm,DC=t-com,DC=de"
 ldap: filter = "sAMAccountname=%{User-Name}"
 ldap: base_filter = "(objectclass=radiusprofile)"
 ldap: default_profile = "(null)"
 ldap: profile_attribute = "(null)"
 ldap: password_header = "(null)"
 ldap: password_attribute = "(null)"
 ldap: access_attr = "(null)"
 ldap: groupname_attribute = "cn"
 ldap: groupmembership_filter = "(|(&(objectClass=GroupOfNames)(member=%{Ldap-UserDn}))(&(objectClass=GroupOfUniqueNames)(uniquemember=%{Ldap-UserDn})))"
 ldap: groupmembership_attribute = "(null)"
 ldap: dictionary_mapping = "/etc/freeradius/ldap.attrmap"
 ldap: ldap_debug = 0
 ldap: ldap_connections_number = 5
 ldap: compare_check_items = no
 ldap: access_attr_used_for_allow = yes
 ldap: do_xlat = yes
 ldap: edir_account_policy_check = no
 ldap: set_auth_type = yes
rlm_ldap: Registering ldap_groupcmp for Ldap-Group
rlm_ldap: Registering ldap_xlat with xlat_name ldap
rlm_ldap: reading ldap<->radius mappings from file /etc/freeradius/ldap.attrmap
rlm_ldap: LDAP uid mapped to RADIUS $GENERIC$
conns: 0x81215a8
Module: Instantiated ldap (ldap)
Module: Loaded eap
 eap: default_eap_type = "peap"
 eap: timer_expire = 60
 eap: ignore_unknown_eap_types = no
 eap: cisco_accounting_username_bug = no
rlm_eap: Loaded and initialized type md5
rlm_eap: Loaded and initialized type leap
 gtc: challenge = "Password: "
 gtc: auth_type = "PAP"
rlm_eap: Loaded and initialized type gtc
 tls: rsa_key_exchange = no
 tls: dh_key_exchange = yes
 tls: rsa_key_length = 512
 tls: dh_key_length = 512
 tls: verify_depth = 0
 tls: CA_path = "(null)"
 tls: pem_file_type = yes
 tls: private_key_file = "/etc/freeradius/certs/cert-srv.pem"
 tls: certificate_file = "/etc/freeradius/certs/cert-srv.pem"
 tls: CA_file = "/etc/freeradius/certs/demoCA/cacert.pem"
 tls: private_key_password = "whatever"
 tls: dh_file = "/etc/freeradius/certs/dh"
 tls: random_file = "/etc/freeradius/certs/random"
 tls: fragment_size = 1024
 tls: include_length = yes
 tls: check_crl = no
 tls: check_cert_cn = "(null)"
rlm_eap_tls: Loading the certificate file as a chain
rlm_eap: Loaded and initialized type tls
 peap: default_eap_type = "mschapv2"
 peap: copy_request_to_tunnel = yes
 peap: use_tunneled_reply = yes
 peap: proxy_tunneled_request_as_eap = yes
rlm_eap: Loaded and initialized type peap
 mschapv2: with_ntdomain_hack = no
rlm_eap: Loaded and initialized type mschapv2
Module: Instantiated eap (eap)
 exec: wait = yes
 exec: program = "/usr/bin/ntlm_auth --username="%{User-Name}" --password='%{User-Password}' --domain=SOUTH"
 exec: input_pairs = "request"
 exec: output_pairs = "reply"
 exec: packet_type = "(null)"
Module: Instantiated exec (win_domain)
Module: Loaded preprocess
 preprocess: huntgroups = "/etc/freeradius/huntgroups"
 preprocess: hints = "/etc/freeradius/hints"
 preprocess: with_ascend_hack = no
 preprocess: ascend_channels_per_line = 23
 preprocess: with_ntdomain_hack = no
 preprocess: with_specialix_jetstream_hack = no
 preprocess: with_cisco_vsa_hack = no
Module: Instantiated preprocess (preprocess)
Module: Loaded realm
 realm: format = "suffix"
 realm: delimiter = "@"
 realm: ignore_default = no
 realm: ignore_null = no
Module: Instantiated realm (suffix)
Module: Loaded files
 files: usersfile = "/etc/freeradius/users"
 files: acctusersfile = "/etc/freeradius/acct_users"
 files: preproxy_usersfile = "/etc/freeradius/preproxy_users"
 files: compat = "no"
Module: Instantiated files (files)
Module: Loaded Acct-Unique-Session-Id
 acct_unique: key = "User-Name, Acct-Session-Id, NAS-IP-Address, Client-IP-Address, NAS-Port"
Module: Instantiated acct_unique (acct_unique)
Module: Loaded detail
 detail: detailfile = "/var/log/freeradius/radacct/%{Client-IP-Address}/detail-%Y%m%d"
 detail: detailperm = 384
 detail: dirperm = 493
 detail: locking = no
Module: Instantiated detail (detail)
Module: Loaded radutmp
 radutmp: filename = "/var/log/freeradius/radutmp"
 radutmp: username = "%{User-Name}"
 radutmp: case_sensitive = yes
 radutmp: check_with_nas = yes
 radutmp: perm = 384
 radutmp: callerid = yes
Module: Instantiated radutmp (radutmp)
Listening on authentication *:1812
Listening on accounting *:1813
Ready to process requests.
rad_recv: Access-Request packet from host 127.0.0.1:35261, id=176, length=64
        User-Name = "john.smith"
        User-Password = "smith1000"
        NAS-IP-Address = 255.255.255.255
        NAS-Port = 1645
  Processing the authorize section of radiusd.conf
modcall: entering group authorize for request 0
  modcall[authorize]: module "preprocess" returns ok for request 0
  modcall[authorize]: module "chap" returns noop for request 0
  modcall[authorize]: module "mschap" returns noop for request 0
    rlm_realm: No '@' in User-Name = "john.smith", looking up realm NULL
    rlm_realm: No such realm "NULL"
  modcall[authorize]: module "suffix" returns noop for request 0
  rlm_eap: No EAP-Message, not doing EAP
  modcall[authorize]: module "eap" returns noop for request 0
    users: Matched entry DEFAULT at line 99
  modcall[authorize]: module "files" returns ok for request 0
rlm_ldap: - authorize
rlm_ldap: performing user authorization for john.smith
radius_xlat:  'sAMAccountname=john.smith'
radius_xlat:  'DC=winlab,DC=rsnhm,DC=t-com,DC=de'
rlm_ldap: ldap_get_conn: Checking Id: 0
rlm_ldap: ldap_get_conn: Got Id: 0
rlm_ldap: attempting LDAP reconnection
rlm_ldap: (re)connect to 10.187.64.3:389, authentication 0
rlm_ldap: bind as CN=Hans Dampf,CN=Computers,DC=winlab,DC=rsnhm,DC=t-com,DC=de/Gerti1000 to 10.187.64.3:389
rlm_ldap: waiting for bind result ...
rlm_ldap: Bind was successful
rlm_ldap: performing search in DC=winlab,DC=rsnhm,DC=t-com,DC=de, with filter sAMAccountname=john.smith
rlm_ldap: looking for check items in directory...
rlm_ldap: looking for reply items in directory...
rlm_ldap: user john.smith authorized to use remote access
rlm_ldap: ldap_release_conn: Release Id: 0
  modcall[authorize]: module "ldap" returns ok for request 0
modcall: leaving group authorize (returns ok) for request 0
  rad_check_password:  Found Auth-Type win_domain
auth: type "win_domain"
  Processing the authenticate section of radiusd.conf
modcall: entering group win_domain for request 0
radius_xlat:  '/usr/bin/ntlm_auth --username="john.smith" --password='smith1000' --domain=SOUTH'
Exec-Program: /usr/bin/ntlm_auth --username="john.smith" --password='smith1000' --domain=SOUTH
Exec-Program output: NT_STATUS_NO_SUCH_USER: No such user (0xc0000064)
Exec-Program-Wait: plaintext: NT_STATUS_NO_SUCH_USER: No such user (0xc0000064)
Exec-Program: returned: 1
rlm_exec (win_domain): External script failed
  modcall[authenticate]: module "win_domain" returns fail for request 0
modcall: leaving group win_domain (returns fail) for request 0
auth: Failed to validate the user.
Login incorrect: [john.smith/smith1000] (from client localhost port 1645)
Delaying request 0 for 1 seconds
Finished request 0
Going to the next request
--- Walking the entire request list ---
Waking up in 1 seconds...
--- Walking the entire request list ---
Waking up in 1 seconds...
--- Walking the entire request list ---
Sending Access-Reject of id 176 to 127.0.0.1 port 35261
Waking up in 4 seconds...
--- Walking the entire request list ---
Cleaning up request 0 ID 176 with timestamp 44a4e1a4
Nothing to do.  Sleeping until we see a request.

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