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    NTLM auth and sign - Define crypto hash functions and create and send keys needed for key exchange · d2b91521
    Shirish Pargaonkar 提交于
    Mark dependency on crypto modules in Kconfig.
    
    Defining per structures sdesc and cifs_secmech which are used to store
    crypto hash functions and contexts.  They are stored per smb connection
    and used for all auth mechs to genereate hash values and signatures.
    
    Allocate crypto hashing functions, security descriptiors, and respective
    contexts when a smb/tcp connection is established.
    Release them when a tcp/smb connection is taken down.
    
    md5 and hmac-md5 are two crypto hashing functions that are used
    throught the life of an smb/tcp connection by various functions that
    calcualte signagure and ntlmv2 hash, HMAC etc.
    
    structure ntlmssp_auth is defined as per smb connection.
    
    ntlmssp_auth holds ciphertext which is genereated by rc4/arc4 encryption of
    secondary key, a nonce using ntlmv2 session key and sent in the session key
    field of the type 3 message sent by the client during ntlmssp
    negotiation/exchange
    
    A key is exchanged with the server if client indicates so in flags in
    type 1 messsage and server agrees in flag in type 2 message of ntlmssp
    negotiation.  If both client and agree, a key sent by client in
    type 3 message of ntlmssp negotiation in the session key field.
    The key is a ciphertext generated off of secondary key, a nonce, using
    ntlmv2 hash via rc4/arc4.
    
    Signing works for ntlmssp in this patch. The sequence number within
    the server structure needs to be zero until session is established
    i.e. till type 3 packet of ntlmssp exchange of a to be very first
    smb session on that smb connection is sent.
    Acked-by: NJeff Layton <jlayton@redhat.com>
    Signed-off-by: NShirish Pargaonkar <shirishpargaonkar@gmail.com>
    Signed-off-by: NSteve French <sfrench@us.ibm.com>
    d2b91521
cifsproto.h 17.8 KB