include/ntlmssp.h

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/* 
   Unix SMB/CIFS implementation.
   SMB parameters and setup
   Copyright (C) Andrew Tridgell 1992-1997
   Copyright (C) Luke Kenneth Casson Leighton 1996-1997
   Copyright (C) Paul Ashton 1997
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/* NTLMSSP mode */
enum NTLMSSP_ROLE
{
        NTLMSSP_SERVER,
        NTLMSSP_CLIENT
};

/* NTLMSSP message types */
enum NTLM_MESSAGE_TYPE
{
        NTLMSSP_INITIAL = 0 /* samba internal state */,
        NTLMSSP_NEGOTIATE = 1,
        NTLMSSP_CHALLENGE = 2,
        NTLMSSP_AUTH      = 3,
        NTLMSSP_UNKNOWN   = 4,
        NTLMSSP_DONE      = 5 /* samba final state */
};

/* NTLMSSP negotiation flags */
#define NTLMSSP_NEGOTIATE_UNICODE          0x00000001
#define NTLMSSP_NEGOTIATE_OEM              0x00000002
#define NTLMSSP_REQUEST_TARGET             0x00000004
#define NTLMSSP_NEGOTIATE_SIGN             0x00000010 /* Message integrity */
#define NTLMSSP_NEGOTIATE_SEAL             0x00000020 /* Message confidentiality */
#define NTLMSSP_NEGOTIATE_DATAGRAM_STYLE   0x00000040
#define NTLMSSP_NEGOTIATE_LM_KEY           0x00000080
#define NTLMSSP_NEGOTIATE_NETWARE          0x00000100
#define NTLMSSP_NEGOTIATE_NTLM             0x00000200
#define NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED  0x00001000
#define NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED 0x00002000
#define NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL  0x00004000
#define NTLMSSP_NEGOTIATE_ALWAYS_SIGN      0x00008000
#define NTLMSSP_TARGET_TYPE_DOMAIN            0x10000
#define NTLMSSP_TARGET_TYPE_SERVER            0x20000
#define NTLMSSP_CHAL_INIT_RESPONSE         0x00010000

#define NTLMSSP_CHAL_ACCEPT_RESPONSE       0x00020000
#define NTLMSSP_CHAL_NON_NT_SESSION_KEY    0x00040000
#define NTLMSSP_NEGOTIATE_NTLM2            0x00080000
#define NTLMSSP_CHAL_TARGET_INFO           0x00800000
#define NTLMSSP_UNKNOWN_02000000           0x02000000
#define NTLMSSP_NEGOTIATE_128              0x20000000 /* 128-bit encryption */
#define NTLMSSP_NEGOTIATE_KEY_EXCH         0x40000000
#define NTLMSSP_NEGOTIATE_56               0x80000000

#define NTLMSSP_FEATURE_SESSION_KEY        0x00000001
#define NTLMSSP_FEATURE_SIGN               0x00000002
#define NTLMSSP_FEATURE_SEAL               0x00000004

#define NTLMSSP_NAME_TYPE_SERVER      0x01
#define NTLMSSP_NAME_TYPE_DOMAIN      0x02
#define NTLMSSP_NAME_TYPE_SERVER_DNS  0x03
#define NTLMSSP_NAME_TYPE_DOMAIN_DNS  0x04

#define NTLMSSP_SIG_SIZE 16

typedef struct ntlmssp_state 
{
        TALLOC_CTX *mem_ctx;
        unsigned int ref_count;
        enum NTLMSSP_ROLE role;
        enum server_types server_role;
        uint32 expected_state;

        BOOL unicode;
        BOOL use_ntlmv2;
        char *user;
        char *domain;
        char *workstation;
        unsigned char *nt_hash;
        unsigned char *lm_hash;
        char *server_domain;

        DATA_BLOB internal_chal; /* Random challenge as supplied to the client for NTLM authentication */

        DATA_BLOB chal; /* Random challenge as input into the actual NTLM (or NTLM2) authentication */
        DATA_BLOB lm_resp;
        DATA_BLOB nt_resp;
        DATA_BLOB session_key;
        
        uint32 neg_flags; /* the current state of negotiation with the NTLMSSP partner */
        
        void *auth_context;

        /**
         * Callback to get the 'challenge' used for NTLM authentication.  
         *
         * @param ntlmssp_state This structure
         * @return 8 bytes of challnege data, determined by the server to be the challenge for NTLM authentication
         *
         */
        const uint8 *(*get_challenge)(const struct ntlmssp_state *ntlmssp_state);

        /**
         * Callback to find if the challenge used by NTLM authentication may be modified 
         *
         * The NTLM2 authentication scheme modifies the effective challenge, but this is not compatiable with the
         * current 'security=server' implementation..  
         *
         * @param ntlmssp_state This structure
         * @return Can the challenge be set to arbitary values?
         *
         */
        BOOL (*may_set_challenge)(const struct ntlmssp_state *ntlmssp_state);

        /**
         * Callback to set the 'challenge' used for NTLM authentication.  
         *
         * The callback may use the void *auth_context to store state information, but the same value is always available
         * from the DATA_BLOB chal on this structure.
         *
         * @param ntlmssp_state This structure
         * @param challenge 8 bytes of data, agreed by the client and server to be the effective challenge for NTLM2 authentication
         *
         */
        NTSTATUS (*set_challenge)(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge);

        /**
         * Callback to check the user's password.  
         *
         * The callback must reads the feilds of this structure for the information it needs on the user 
         * @param ntlmssp_state This structure
         * @param nt_session_key If an NT session key is returned by the authentication process, return it here
         * @param lm_session_key If an LM session key is returned by the authentication process, return it here
         *
         */
        NTSTATUS (*check_password)(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *nt_session_key, DATA_BLOB *lm_session_key);

        const char *(*get_global_myname)(void);
        const char *(*get_domain)(void);

        /* ntlmv2 */

        unsigned char send_sign_key[16];
        unsigned char send_seal_key[16];
        unsigned char recv_sign_key[16];
        unsigned char recv_seal_key[16];

        unsigned char send_seal_arc4_state[258];
        unsigned char recv_seal_arc4_state[258];

        uint32 ntlm2_send_seq_num;
        uint32 ntlm2_recv_seq_num;

        /* ntlmv1 */
        unsigned char ntlmv1_arc4_state[258];
        uint32 ntlmv1_seq_num;

        /* it turns out that we don't always get the
           response in at the time we want to process it.
           Store it here, until we need it */
        DATA_BLOB stored_response; 
        
} NTLMSSP_STATE;

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