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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
Copyright (C) Andrew Bartlett 2010
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "../librpc/gen_ndr/ntlmssp.h"
/* NTLMSSP mode */
enum ntlmssp_role
{
NTLMSSP_SERVER,
NTLMSSP_CLIENT
};
/* NTLMSSP message types */
enum ntlmssp_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 */
};
#define NTLMSSP_FEATURE_SESSION_KEY 0x00000001
#define NTLMSSP_FEATURE_SIGN 0x00000002
#define NTLMSSP_FEATURE_SEAL 0x00000004
#define NTLMSSP_FEATURE_CCACHE 0x00000008
union ntlmssp_crypt_state;
struct ntlmssp_state
{
enum ntlmssp_role role;
uint32_t expected_state;
bool unicode;
bool use_ntlmv2;
bool use_ccache;
bool use_nt_response; /* Set to 'False' to debug what happens when the NT response is omited */
bool allow_lm_key; /* The LM_KEY code is not very secure... */
const char *user;
const char *domain;
uint8_t *nt_hash;
uint8_t *lm_hash;
struct {
const char *netbios_name;
const char *netbios_domain;
} client;
struct {
bool is_standalone;
const char *netbios_name;
const char *netbios_domain;
const char *dns_name;
const char *dns_domain;
} server;
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_t neg_flags; /* the current state of negotiation with the NTLMSSP partner */
/**
* Private data for the callback functions
*/
void *callback_private;
/**
* Callback to get the 'challenge' used for NTLM authentication.
*
* @param ntlmssp_state This structure
* @return 8 bytes of challenge data, determined by the server to be the challenge for NTLM authentication
*
*/
NTSTATUS (*get_challenge)(const struct ntlmssp_state *ntlmssp_state,
uint8_t challenge[8]);
/**
* 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 mem_ctx Talloc context for LM and NT session key to be returned on
* @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, TALLOC_CTX *mem_ctx,
DATA_BLOB *nt_session_key, DATA_BLOB *lm_session_key);
union ntlmssp_crypt_state *crypt;
};
/* The following definitions come from libcli/auth/ntlmssp_sign.c */
NTSTATUS ntlmssp_sign_packet(struct ntlmssp_state *ntlmssp_state,
TALLOC_CTX *sig_mem_ctx,
const uint8_t *data, size_t length,
const uint8_t *whole_pdu, size_t pdu_length,
DATA_BLOB *sig);
NTSTATUS ntlmssp_check_packet(struct ntlmssp_state *ntlmssp_state,
const uint8_t *data, size_t length,
const uint8_t *whole_pdu, size_t pdu_length,
const DATA_BLOB *sig) ;
NTSTATUS ntlmssp_seal_packet(struct ntlmssp_state *ntlmssp_state,
TALLOC_CTX *sig_mem_ctx,
uint8_t *data, size_t length,
const uint8_t *whole_pdu, size_t pdu_length,
DATA_BLOB *sig);
NTSTATUS ntlmssp_unseal_packet(struct ntlmssp_state *ntlmssp_state,
uint8_t *data, size_t length,
const uint8_t *whole_pdu, size_t pdu_length,
const DATA_BLOB *sig);
NTSTATUS ntlmssp_sign_init(struct ntlmssp_state *ntlmssp_state);
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