2023年7月のCVE-2022-38023関連対応後、古いONTAPシミュレーターは sambaで作ったActive Directory環境に参加できなくなった。
samba側の設定を変更し、セキュリティ的に問題がある接続でも受け付けるようにすればいいのかな、と試してみた。
sambaのCVE-2022-38023対応に関して書かれている「RC4/HMAC-MD5 NetLogon Secure Channel is weak and should be avoided」に、これまでのdefaultから変更した点がかかれているので、これの逆をやればいいのか、と以下を設定した。
[global]
＜略＞
allow nt4 crypto = yes
reject md5 clients = no
server reject md5 schannel = no
server schannel = yes
server schannel require seal = no
＜略＞
拒否しない(rejectをno)のと、必須を解除(requireをno)にすればいいか、というレベルでの対応となる。
ドキュメントの「Cryptographic configuration」を見た感じだとこれで良さそう。
もちろんこれは過去のバージョンを動かす必要があって行うものであり、本来の運用で使用するものではない設定となる。
この設定を行い、sambaの再起動
NetAppのCIFS稼働のSVMでは、vserver cifs securityの項目にて「-smb2-enabled-for-dc-connections true」と「-is-aes-encryption-enabled true」の設定を行っている
エラーメッセージコレクション
ONTAP 9.1 シミュレーター(パッチ無し)
このバージョンではオプションの -smb2-enabled-for-dc-connections と -is-aes-encryption-enabled が存在していないので、エラー内容が結構違う。
ontap91::> vserver cifs create -cifs-server svm91 -domain ADOSAKANA.LOCAL
In order to create an Active Directory machine account for the CIFS server, you
must supply the name and password of a Windows account with sufficient
privileges to add computers to the "CN=Computers" container within the
"ADOSAKANA.LOCAL" domain.
Enter the user name: administrator
Enter the password:
Warning: An account by this name already exists in Active Directory at
CN=SVM91,CN=Computers,DC=adosakana,DC=local.
If there is an existing DNS entry for the name SVM91, it must be
removed. Data ONTAP cannot remove such an entry.
Use an external tool to remove it after this command completes.
Ok to reuse this account? {y|n}: y
Error: command failed: Failed to create CIFS server SVM91. Reason:
create_with_lug: RPC: Unable to receive; errno = Connection reset by
peer; netid=tcp fd=17 TO=600.0s TT=0.119s O=224b I=0b CN=113/3 VSID=-3
127.0.0.1:766.
ontap91::>
ONTAP 9.1P22 シミュレーター
ontap91::> vserver cifs create -cifs-server svm91 -domain ADOSAKANA.LOCAL
In order to create an Active Directory machine account for the CIFS server, you
must supply the name and password of a Windows account with sufficient
privileges to add computers to the "CN=Computers" container within the
"ADOSAKANA.LOCAL" domain.
Enter the user name: administrator
Enter the password:
Error: Machine account creation procedure failed
[ 56] Loaded the preliminary configuration.
[ 92] Successfully connected to ip 172.17.44.49, port 88 using
TCP
[ 107] Successfully connected to ip 172.17.44.49, port 389 using
TCP
[ 110] Unable to start TLS: Connect error
[ 110] Additional info:
[ 110] Unable to connect to LDAP (Active Directory) service on
sambaad.ADOSAKANA.LOCAL
**[ 110] FAILURE: Unable to make a connection (LDAP (Active
** Directory):ADOSAKANA.LOCAL), result: 7652
Error: command failed: Failed to create the Active Directory machine account
"SVM91". Reason: LDAP Error: Cannot establish a connection to the
server.
ontap91::>
ontap91::> vserver cifs create -cifs-server svm91 -domain ADOSAKANA.LOCAL
In order to create an Active Directory machine account for the CIFS server, you
must supply the name and password of a Windows account with sufficient
privileges to add computers to the "CN=Computers" container within the
"ADOSAKANA.LOCAL" domain.
Enter the user name: administrator
Enter the password:
Error: Machine account creation procedure failed
[ 61] Loaded the preliminary configuration.
[ 99] Successfully connected to ip 172.17.44.49, port 88 using
TCP
[ 168] Successfully connected to ip 172.17.44.49, port 389 using
TCP
[ 168] Entry for host-address: 172.17.44.49 not found in the
current source: FILES. Ignoring and trying next available
source
[ 172] Source: DNS unavailable. Entry for
host-address:172.17.44.49 not found in any of the
available sources
**[ 181] FAILURE: Unable to SASL bind to LDAP server using GSSAPI:
** Local error
[ 181] Additional info: SASL(-1): generic failure: GSSAPI Error:
Unspecified GSS failure. Minor code may provide more
information (Cannot determine realm for numeric host
address)
[ 181] Unable to connect to LDAP (Active Directory) service on
sambaad.ADOSAKANA.LOCAL (Error: Local error)
[ 181] Unable to make a connection (LDAP (Active
Directory):ADOSAKANA.LOCAL), result: 7643
Error: command failed: Failed to create the Active Directory machine account
"SVM91". Reason: LDAP Error: Local error occurred.
ontap91::>
ontap91::> vserver cifs create -cifs-server svm91 -domain ADOSAKANA.LOCAL
In order to create an Active Directory machine account for the CIFS server, you
must supply the name and password of a Windows account with sufficient
privileges to add computers to the "CN=Computers" container within the
"ADOSAKANA.LOCAL" domain.
Enter the user name: administrator
Enter the password:
Warning: An account by this name already exists in Active Directory at
CN=SVM91,CN=Computers,DC=adosakana,DC=local.
If there is an existing DNS entry for the name SVM91, it must be
removed. Data ONTAP cannot remove such an entry.
Use an external tool to remove it after this command completes.
Ok to reuse this account? {y|n}: y
Error: Machine account creation procedure failed
[ 13] Loaded the preliminary configuration.
[ 92] Created a machine account in the domain
[ 93] SID to name translations of Domain Users and Admins
completed successfully
[ 100] Modified account 'cn=SVM91,CN=Computers,dc=VM2,dc=ADOSAKANA
dc=LOCAL'
[ 101] Successfully connected to ip 172.17.44.49, port 88 using
TCP
[ 113] Successfully connected to ip 172.17.44.49, port 464 using
TCP
[ 242] Kerberos password set for 'SVM91$@ADOSAKANA.LOCAL' succeeded
[ 242] Set initial account password
[ 277] Successfully connected to ip 172.17.44.49, port 445 using
TCP
[ 312] Successfully connected to ip 172.17.44.49, port 88 using
TCP
[ 346] Successfully authenticated with DC
sambaad.ADOSAKANA.LOCAL
[ 366] Unable to connect to NetLogon service on
sambaad.ADOSAKANA.LOCAL (Error:
RESULT_ERROR_GENERAL_FAILURE)
**[ 366] FAILURE: Unable to make a connection
** (NetLogon:ADOSAKANA.LOCAL), result: 3
[ 366] Unable to make a NetLogon connection to
sambaad.ADOSAKANA.LOCAL using the new machine account
Error: command failed: Failed to create the Active Directory machine account
"SVM91". Reason: general failure.
ontap91::>