Only local resources can be accessed. NTLM works both locally and across computers. That is, if the client and server are on different computers, NTLM can still make sure the client is who it claims to be. With NTLM, the client's identity is represented by a domain name, user name, and a password or token. When a server calls CoQueryClientBlanket , the client's domain name and user name are returned. However, when a server calls CoImpersonateClient , the client's token is returned.
If there is no trust relationship between client and server and if the server has a local account with the same name and password as the client, that account will be used to represent the client. Though it is rare that SMB falls back to the computer, or machine, account, it is possible.
This setup uses the machine account of the Hyper-V host s to access the SMB share rather than a user or a service account. When no account is explicitly provided SMB will try implicit credentials.
Some shares and third-party file servers with certain permissions will allow computer accounts to connect. You may have limited or no usable access, but it will authenticate. Using implicit credentials is not a null session connection since credentials are being provided; even though, they were not explicitly provided.
This means the SMB session is being authorized, and therefore not a null session. What are implicit and explicit credentials, exactly? An explicit credential is one that is provided as part of authentication. Implicit credentials are the opposite of that. When no explicit credential is provided it is implied that the operating system should use the credentials of the current logged-on user. You even ran the commands to prove it. Now you think Microsoft is up to their old tricks.
Fine, let me prove it to you. These are all tests anyone can run to confirm. The second command sets no explicit credentials. This is where the more interesting behavior will happen because it leaves room for Windows to try implicit credentials. Names Pipes are an old-school method used to allow two services to talk with each other, even over a network connection. Older versions of Windows may behave differently than these tests.
This is the basic home scenario. Two computers used by a regular folks who just want things to work without ever opening a settings console in their entire life. This is all expected behavior because RedWrk and BlueWrk have no inherent trust between each other. No centralized authentication method means that each workgroup member must rely on their local security database, which does not contain details about the other workgroup member s unless those details are explicitly added.
This means that all anonymous and implicit authentication methods will fail. RedWrk and BlueWrk were joined to the domain for the next step. This is where things start to get interesting for us. Remember when I said Windows really wants to make that connection work? Specifically, the Session Setup part, where authentication happens. This is the same mechanism that allows you to connect to your work shared drives through Windows Explorer without explicitly entering your Windows credentials, just in command line form.
Since valid domain credentials were passed and accepted, this is not a null session. Even though it may look like one on the surface. This is because an IP address requires a little extra setup to be a valid Kerberos object. Also, NTLM is in plain text which makes authentication easier to understand in the context of an article.
Same story as the previous command. SMB used the domain account of the logged-on user and the connection was successful. Kerberos is really the way to go. Security Blob: abb2aaa10baf…. Simple Protected Negotiation.
This behavior is not necessarily default in older versions of Windows. The presence of a single period. Which in turn could cause the helper to authenticate the user. The username, expected to be in Samba's unix charset. The user's domain, expected to be in Samba's unix charset. The fully qualified username, expected to be in Samba's unix charset and qualified with the winbind separator.
Typically, this is provided over the network by a client wishing to authenticate. The user's password. This would be provided by a network client, if the helper is being used in a legacy situation that exposes plaintext passwords in this way.
They may also need to decode strings from the helper, which likewise may have been base64 encoded. Perform Diagnostics on the authentication chain. Uses the password from --password or prompts for one. Require that a user be a member of specified group either name or SID for authentication to succeed. The default value if this parameter is not specified is 1 for client applications.
The higher this value, the more detail will be logged to the log files about the activities of the server.
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