MSCHAPv2 аутентификация не работает

Я борюсь с этим уже около недели. Я пытаюсь настроить сервер RADIUS для аутентификации в нашей Active Directory на основе Samba, но не могу заставить его работать. Из-за нашей инфраструктуры PAP не будет работать. Поскольку AD не предлагает известный надежный пароль в виде открытого текста, CHAP не будет работать. Таким образом, остается MSCHAP.

Сервер RADIUS находится на собственной виртуальной машине. Указанная виртуальная машина связана с доменом с помощью Winbind. У меня есть следующие /etc/raddb/mods-available/mschap:

$ cat /etc/raddb/mods-available/mschap|grep -Ev '^\s*(#|$)'
mschap {
    ntlm_auth = "/usr/bin/ntlm_auth --request-nt-key --username=%{%{Stripped-User-Name}:-%{%{User-Name}:-None}} --challenge=%{%{mschap:Challenge}:-00} --nt-response=%{%{mschap:NT-Response}:-00}"
    winbind_username = "%{mschap:User-Name}"
    winbind_domain = "[domain]"
    winbind_retry_with_normalised_username = yes
    pool {
            start = ${thread[pool].start_servers}
            min = ${thread[pool].min_spare_servers}
            max = ${thread[pool].max_servers}
            spare = ${thread[pool].max_spare_servers}
            uses = 0
            retry_delay = 30
            lifetime = 86400
            cleanup_interval = 300
            idle_timeout = 600
    }
}

Когда у меня есть попытка клиента пройти аутентификацию, соответствующий radiusd -X вывод:

Listening on auth address * port 1812 bound to server default
Listening on acct address * port 1813 bound to server default
Listening on auth address :: port 1812 bound to server default
Listening on acct address :: port 1813 bound to server default
Listening on auth address 127.0.0.1 port 18120 bound to server inner-tunnel
Ready to process requests
(0) Received Access-Request Id 22 from 192.168.6.179:43922 to 192.168.6.192:1812 length 180
(0)   Service-Type = Framed-User
(0)   Framed-Protocol = PPP
(0)   NAS-Port = 15728668
(0)   NAS-Port-Type = Virtual
(0)   User-Name = "duncan"
(0)   Calling-Station-Id = "192.168.6.100"
(0)   Called-Station-Id = "192.168.6.179"
(0)   MS-CHAP-Challenge = 0x7fd91ada13b38b1800f2f5c1b9a107e4
(0)   MS-CHAP2-Response = 0x01000ff84b43a7f4d54b20da108b5f6a76480000000000000000b366008c649fc36a4a9bfb044f65dc8daf3aee10ad679141
(0)   NAS-Identifier = "MikroTik"
(0)   NAS-IP-Address = 192.168.6.179
(0) # Executing section authorize from file /usr/local/etc/raddb/sites-enabled/default
(0)   authorize {
(0)     policy filter_username {
(0)       if (&User-Name) {
(0)       if (&User-Name)  -> TRUE
(0)       if (&User-Name)  {
(0)         if (&User-Name =~ / /) {
(0)         if (&User-Name =~ / /)  -> FALSE
(0)         if (&User-Name =~ /@[^@]*@/ ) {
(0)         if (&User-Name =~ /@[^@]*@/ )  -> FALSE
(0)         if (&User-Name =~ /\.\./ ) {
(0)         if (&User-Name =~ /\.\./ )  -> FALSE
(0)         if ((&User-Name =~ /@/) && (&User-Name !~ /@(.+)\.(.+)$/))  {
(0)         if ((&User-Name =~ /@/) && (&User-Name !~ /@(.+)\.(.+)$/))   -> FALSE
(0)         if (&User-Name =~ /\.$/)  {
(0)         if (&User-Name =~ /\.$/)   -> FALSE
(0)         if (&User-Name =~ /@\./)  {
(0)         if (&User-Name =~ /@\./)   -> FALSE
(0)       } # if (&User-Name)  = notfound
(0)     } # policy filter_username = notfound
(0)     [preprocess] = ok
(0) mschap: Found MS-CHAP attributes.  Setting 'Auth-Type  = mschap'
(0)     [mschap] = ok
(0)     [digest] = noop
(0) files: users: Matched entry DEFAULT at line 181
(0)     [files] = ok
(0)     [expiration] = noop
(0)     [logintime] = noop
(0) pap: WARNING: No "known good" password found for the user.  Not setting Auth-Type
(0) pap: WARNING: Authentication will fail unless a "known good" password is available
(0)     [pap] = noop
(0)   } # authorize = ok
(0) Found Auth-Type = mschap
(0) # Executing group from file /usr/local/etc/raddb/sites-enabled/default
(0)   authenticate {
(0) mschap: Creating challenge hash with username: duncan
(0) mschap: Client is using MS-CHAPv2
(0) mschap: Executing: /usr/bin/ntlm_auth --request-nt-key --username=%{%{Stripped-User-Name}:-%{%{User-Name}:-None}} --challenge=%{%{mschap:Challenge}:-00} --nt-response=%{%{mschap:NT-Response}:-00}:
(0) mschap: EXPAND --username=%{%{Stripped-User-Name}:-%{%{User-Name}:-None}}
(0) mschap:    --> --username=duncan
(0) mschap: Creating challenge hash with username: duncan
(0) mschap: EXPAND --challenge=%{%{mschap:Challenge}:-00}
(0) mschap:    --> --challenge=6c2a06548de859d5
(0) mschap: EXPAND --nt-response=%{%{mschap:NT-Response}:-00}
(0) mschap:    --> --nt-response=b366008c649fc36a4a9bfb044f65dc8daf3aee10ad679141
(0) mschap: ERROR: Program returned code (1) and output 'Logon failure (0xc000006d)'
(0) mschap: External script failed
(0) mschap: ERROR: External script says: Logon failure (0xc000006d)
(0) mschap: ERROR: MS-CHAP2-Response is incorrect
(0)     [mschap] = reject
(0)   } # authenticate = reject
(0) Failed to authenticate the user
(0) Using Post-Auth-Type Reject
(0) # Executing group from file /usr/local/etc/raddb/sites-enabled/default
(0)   Post-Auth-Type REJECT {
(0) attr_filter.access_reject: EXPAND %{User-Name}
(0) attr_filter.access_reject:    --> duncan
(0) attr_filter.access_reject: Matched entry DEFAULT at line 11
(0)     [attr_filter.access_reject] = updated
(0)   } # Post-Auth-Type REJECT = updated
(0) Delaying response for 1.000000 seconds
Waking up in 0.6 seconds.
Waking up in 0.3 seconds.
(0) Sending delayed response
(0) Sent Access-Reject Id 22 from 192.168.6.192:1812 to 192.168.6.179:43922 length 103
(0)   MS-CHAP-Error = "\001E=691 R=1 C=06f7ce6fa5be464d72e8def2f9634910 V=3 M=Authentication rejected"
Waking up in 3.9 seconds.
(0) Cleaning up request packet ID 22 with timestamp +8
Ready to process requests

И вывод samba log level 5:

[2018/03/19 11:13:13.166062,  3] ../libcli/auth/schannel_state_tdb.c:190(schannel_fetch_session_key_tdb)
  schannel_fetch_session_key_tdb: restored schannel info key SECRETS/SCHANNEL/GS-RADIUS
[2018/03/19 11:13:13.166160,  3] ../source4/auth/ntlm/auth.c:271(auth_check_password_send)
  auth_check_password_send: Checking password for unmapped user [AD]\[duncan]@[\\GS-RADIUS]
[2018/03/19 11:13:13.166171,  5] ../source4/auth/ntlm/auth_util.c:57(map_user_info_cracknames)
  map_user_info_cracknames: Mapping user [AD]\[duncan] from workstation [\\GS-RADIUS]
  auth_check_password_send: mapped user is: [AD]\[duncan]@[\\GS-RADIUS]
[2018/03/19 11:13:13.166994,  5] ../source4/auth/ntlm/auth.c:67(auth_get_challenge)
  auth_get_challenge: returning previous challenge by module netr_LogonSamLogonWithFlags (normal)
[2018/03/19 11:13:13.167006,  5] ../lib/util/util.c:555(dump_data)
  [0000] 2D F2 C3 E3 15 05 ED 58                             -......X
[2018/03/19 11:13:13.167502,  2] ../libcli/auth/ntlm_check.c:424(ntlm_password_check)
  ntlm_password_check: NTLMv1 passwords NOT PERMITTED for user duncan
[2018/03/19 11:13:13.167518,  3] ../libcli/auth/ntlm_check.c:431(ntlm_password_check)
  ntlm_password_check: NEITHER LanMan nor NT password supplied for user duncan
[2018/03/19 11:13:13.167630,  5] ../source4/dsdb/common/util.c:5252(dsdb_update_bad_pwd_count)
  Not updating badPwdCount on CN=duncan,CN=Users,DC=ad,DC=goldblattsystems,DC=com after wrong password
[2018/03/19 11:13:13.167656,  2] ../source4/auth/ntlm/auth.c:430(auth_check_password_recv)
  auth_check_password_recv: sam_ignoredomain authentication for user [AD\duncan] FAILED with error NT_STATUS_WRONG_PASSWORD
[2018/03/19 11:13:13.348906,  3] ../source4/smbd/service_stream.c:66(stream_terminate_connection)
  Terminating connection - 'ldapsrv_call_loop: tstream_read_pdu_blob_recv() - NT_STATUS_CONNECTION_DISCONNECTED'
[2018/03/19 11:13:13.348929,  3] ../source4/smbd/process_single.c:114(single_terminate)
  single_terminate: reason[ldapsrv_call_loop: tstream_read_pdu_blob_recv() - NT_STATUS_CONNECTION_DISCONNECTED]

Что вызывает это? Как я могу это исправить?