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# SMB2/SessionSetup
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Opcode 0x01
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This [SMB2](/SMB2) command is to authenticate a user and get a UserID assigned. This command is often the very first command issued from a client after the [SMB2/NegotiateProtocol](/SMB2/NegotiateProtocol) phase has completed.
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# SMB2/SessionSetup Request
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## SMB2/SessionSetup Request Packet Format
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Buffer Code | Padding |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Sec Blob Offset | Sec Blob Length |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Sec Blob
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+-+-+-+-+...
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## Buffer Code
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[SMB2/BufferCode](/SMB2/BufferCode)
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## Sec Blob Offset
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This is the offset in bytes of the security blob, starting from the start of the [SMB2/Header](/SMB2/Header).
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## Sec Blob Length
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This is the number of bytes for the security blob.
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## Sec Blob
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This is the ASN.1/DER encoded security blob.
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# SMB2/SessionSetup Response
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## SMB2/SessionSetup Response Packet Format
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Buffer Code | Padding |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Sec Blob Offset | Sec Blob Length |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Sec Blob
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+-+-+-+-+...
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## Buffer Code
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[SMB2/BufferCode](/SMB2/BufferCode)
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## Sec Blob Offset
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This is the offset in bytes of the security blob, starting from the start of the [SMB2/Header](/SMB2/Header).
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## Sec Blob Length
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This is the number of bytes for the security blob.
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## Sec Blob
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This is the ASN.1/DER encoded security blob.
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## NT Status Codes
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# Discussion
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---
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Imported from https://wiki.wireshark.org/SMB2/SessionSetup on 2020-08-11 23:25:14 UTC |
