+ 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);