From d2b915210b5ec01409f581421d633eca6c38d444 Mon Sep 17 00:00:00 2001 From: Shirish Pargaonkar Date: Thu, 21 Oct 2010 14:25:08 -0500 Subject: NTLM auth and sign - Define crypto hash functions and create and send keys needed for key exchange 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: Jeff Layton Signed-off-by: Shirish Pargaonkar Signed-off-by: Steve French --- fs/cifs/cifspdu.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'fs/cifs/cifspdu.h') diff --git a/fs/cifs/cifspdu.h b/fs/cifs/cifspdu.h index a152cd6db99b..de36b09763a8 100644 --- a/fs/cifs/cifspdu.h +++ b/fs/cifs/cifspdu.h @@ -140,6 +140,12 @@ */ #define CIFS_SESS_KEY_SIZE (16) +#define CIFS_CLIENT_CHALLENGE_SIZE (8) +#define CIFS_SERVER_CHALLENGE_SIZE (8) +#define CIFS_HMAC_MD5_HASH_SIZE (16) +#define CIFS_CPHTXT_SIZE (16) +#define CIFS_NTHASH_SIZE (16) + /* * Maximum user name length */ -- cgit v1.2.2