sha256_password Plugin

The sha256_password plugin manages authentication using SHA-256 encryption, supporting both clear text passwords over SSL and RSA encrypted password exchange.

Overview

SHA256 authentication possible exchanges:

• if connection use SSL (SSLRequest Packet sent):

  • Client sends a clear password answer.

• Else:

  • If client doesn't know server RSA public key:

    • Client sends a public key request.

    • Server sends a public key response.

  • Client sends an RSA encrypted password.

  • Ends with server sending either OK_Packet , ERR_Packet.

Authentication

Client Clear Password Answer

• string password without encryption.

Public key request

• byte<1> fixed 0x01 value.

Public key response

• byte<1> fixed 0x01 value.

• byte public key data.

RSA encrypted password

• byte<256> RSA encrypted password.

RSA encrypted value of XOR(password, seed) using server public key (RSA_PKCS1_OAEP_PADDING).

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