Set a blank workstation value

psiphon/upstreamproxy/go-ntlm/ntlm/ntlmv1.go

@@ -343,7 +343,12 @@ func (n *V1ClientSession) GenerateAuthenticateMessage() (am *AuthenticateMessage
 	am.NtChallengeResponseFields, _ = CreateBytePayload(n.ntChallengeResponse)
 	am.DomainName, _ = CreateStringPayload(n.userDomain)
 	am.UserName, _ = CreateStringPayload(n.user)
-	am.Workstation, _ = CreateStringPayload("SQUAREMILL")
+
+	// [Psiphon]
+	// Set a blank workstation value, which is less distinguishable than the previous hard-coded value.
+	// See also: https://github.com/Azure/go-ntlmssp/commit/5e29b886690f00c76b876ae9ab8e31e7c3509203.
+
+	am.Workstation, _ = CreateStringPayload("")
 	am.EncryptedRandomSessionKey, _ = CreateBytePayload(n.encryptedRandomSessionKey)
 	am.NegotiateFlags = n.NegotiateFlags
 	am.Version = &VersionStruct{ProductMajorVersion: uint8(5), ProductMinorVersion: uint8(1), ProductBuild: uint16(2600), NTLMRevisionCurrent: uint8(15)}

psiphon/upstreamproxy/go-ntlm/ntlm/ntlmv2.go

@@ -377,7 +377,12 @@ func (n *V2ClientSession) GenerateAuthenticateMessage() (am *AuthenticateMessage
 	am.NtChallengeResponseFields, _ = CreateBytePayload(n.ntChallengeResponse)
 	am.DomainName, _ = CreateStringPayload(n.userDomain)
 	am.UserName, _ = CreateStringPayload(n.user)
-	am.Workstation, _ = CreateStringPayload("SQUAREMILL")
+
+	// [Psiphon]
+	// Set a blank workstation value, which is less distinguishable than the previous hard-coded value.
+	// See also: https://github.com/Azure/go-ntlmssp/commit/5e29b886690f00c76b876ae9ab8e31e7c3509203.
+
+	am.Workstation, _ = CreateStringPayload("")
 	am.EncryptedRandomSessionKey, _ = CreateBytePayload(n.encryptedRandomSessionKey)
 	am.NegotiateFlags = n.NegotiateFlags
 	am.Mic = make([]byte, 16)