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linux/fs/ksmbd/ntlmssp.h
Gustavo A. R. Silva 5224f79096 treewide: Replace zero-length arrays with flexible-array members 
There is a regular need in the kernel to provide a way to declare
having a dynamically sized set of trailing elements in a structure.
Kernel code should always use “flexible array members”[1] for these
cases. The older style of one-element or zero-length arrays should
no longer be used[2].

This code was transformed with the help of Coccinelle:
(next-20220214$ spatch --jobs $(getconf _NPROCESSORS_ONLN) --sp-file script.cocci --include-headers --dir . > output.patch)

@@
identifier S, member, array;
type T1, T2;
@@

struct S {
  ...
  T1 member;
  T2 array[
- 0
  ];
};

UAPI and wireless changes were intentionally excluded from this patch
and will be sent out separately.

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays

Link: https://github.com/KSPP/linux/issues/78
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2022-02-17 07:00:39 -06:00

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/* SPDX-License-Identifier: LGPL-2.1+ */
/*
* Copyright (c) International Business Machines Corp., 2002,2007
* Author(s): Steve French (sfrench@us.ibm.com)
*/
#ifndef __KSMBD_NTLMSSP_H
#define __KSMBD_NTLMSSP_H
#define NTLMSSP_SIGNATURE "NTLMSSP"
/* Security blob target info data */
#define TGT_Name "KSMBD"
/*
* Size of the crypto key returned on the negotiate SMB in bytes
*/
#define CIFS_CRYPTO_KEY_SIZE (8)
#define CIFS_KEY_SIZE (40)
/*
* Size of encrypted user password in bytes
*/
#define CIFS_ENCPWD_SIZE (16)
#define CIFS_CPHTXT_SIZE (16)
/* Message Types */
#define NtLmNegotiate cpu_to_le32(1)
#define NtLmChallenge cpu_to_le32(2)
#define NtLmAuthenticate cpu_to_le32(3)
#define UnknownMessage cpu_to_le32(8)
/* Negotiate Flags */
#define NTLMSSP_NEGOTIATE_UNICODE 0x01 /* Text strings are unicode */
#define NTLMSSP_NEGOTIATE_OEM 0x02 /* Text strings are in OEM */
#define NTLMSSP_REQUEST_TARGET 0x04 /* Srv returns its auth realm */
/* define reserved9 0x08 */
#define NTLMSSP_NEGOTIATE_SIGN 0x0010 /* Request signing capability */
#define NTLMSSP_NEGOTIATE_SEAL 0x0020 /* Request confidentiality */
#define NTLMSSP_NEGOTIATE_DGRAM 0x0040
#define NTLMSSP_NEGOTIATE_LM_KEY 0x0080 /* Use LM session key */
/* defined reserved 8 0x0100 */
#define NTLMSSP_NEGOTIATE_NTLM 0x0200 /* NTLM authentication */
#define NTLMSSP_NEGOTIATE_NT_ONLY 0x0400 /* Lanman not allowed */
#define NTLMSSP_ANONYMOUS 0x0800
#define NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED 0x1000 /* reserved6 */
#define NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED 0x2000
#define NTLMSSP_NEGOTIATE_LOCAL_CALL 0x4000 /* client/server same machine */
#define NTLMSSP_NEGOTIATE_ALWAYS_SIGN 0x8000 /* Sign. All security levels */
#define NTLMSSP_TARGET_TYPE_DOMAIN 0x10000
#define NTLMSSP_TARGET_TYPE_SERVER 0x20000
#define NTLMSSP_TARGET_TYPE_SHARE 0x40000
#define NTLMSSP_NEGOTIATE_EXTENDED_SEC 0x80000 /* NB:not related to NTLMv2 pwd*/
/* #define NTLMSSP_REQUEST_INIT_RESP 0x100000 */
#define NTLMSSP_NEGOTIATE_IDENTIFY 0x100000
#define NTLMSSP_REQUEST_ACCEPT_RESP 0x200000 /* reserved5 */
#define NTLMSSP_REQUEST_NON_NT_KEY 0x400000
#define NTLMSSP_NEGOTIATE_TARGET_INFO 0x800000
/* #define reserved4 0x1000000 */
#define NTLMSSP_NEGOTIATE_VERSION 0x2000000 /* we do not set */
/* #define reserved3 0x4000000 */
/* #define reserved2 0x8000000 */
/* #define reserved1 0x10000000 */
#define NTLMSSP_NEGOTIATE_128 0x20000000
#define NTLMSSP_NEGOTIATE_KEY_XCH 0x40000000
#define NTLMSSP_NEGOTIATE_56 0x80000000
/* Define AV Pair Field IDs */
enum av_field_type {
NTLMSSP_AV_EOL = 0,
NTLMSSP_AV_NB_COMPUTER_NAME,
NTLMSSP_AV_NB_DOMAIN_NAME,
NTLMSSP_AV_DNS_COMPUTER_NAME,
NTLMSSP_AV_DNS_DOMAIN_NAME,
NTLMSSP_AV_DNS_TREE_NAME,
NTLMSSP_AV_FLAGS,
NTLMSSP_AV_TIMESTAMP,
NTLMSSP_AV_RESTRICTION,
NTLMSSP_AV_TARGET_NAME,
NTLMSSP_AV_CHANNEL_BINDINGS
};
/* Although typedefs are not commonly used for structure definitions */
/* in the Linux kernel, in this particular case they are useful */
/* to more closely match the standards document for NTLMSSP from */
/* OpenGroup and to make the code more closely match the standard in */
/* appearance */
struct security_buffer {
__le16 Length;
__le16 MaximumLength;
__le32 BufferOffset; /* offset to buffer */
} __packed;
struct target_info {
__le16 Type;
__le16 Length;
__u8 Content[];
} __packed;
struct negotiate_message {
__u8 Signature[sizeof(NTLMSSP_SIGNATURE)];
__le32 MessageType; /* NtLmNegotiate = 1 */
__le32 NegotiateFlags;
struct security_buffer DomainName; /* RFC 1001 style and ASCII */
struct security_buffer WorkstationName; /* RFC 1001 and ASCII */
/*
* struct security_buffer for version info not present since we
* do not set the version is present flag
*/
char DomainString[];
/* followed by WorkstationString */
} __packed;
struct challenge_message {
__u8 Signature[sizeof(NTLMSSP_SIGNATURE)];
__le32 MessageType; /* NtLmChallenge = 2 */
struct security_buffer TargetName;
__le32 NegotiateFlags;
__u8 Challenge[CIFS_CRYPTO_KEY_SIZE];
__u8 Reserved[8];
struct security_buffer TargetInfoArray;
/*
* struct security_buffer for version info not present since we
* do not set the version is present flag
*/
} __packed;
struct authenticate_message {
__u8 Signature[sizeof(NTLMSSP_SIGNATURE)];
__le32 MessageType; /* NtLmsAuthenticate = 3 */
struct security_buffer LmChallengeResponse;
struct security_buffer NtChallengeResponse;
struct security_buffer DomainName;
struct security_buffer UserName;
struct security_buffer WorkstationName;
struct security_buffer SessionKey;
__le32 NegotiateFlags;
/*
* struct security_buffer for version info not present since we
* do not set the version is present flag
*/
char UserString[];
} __packed;
struct ntlmv2_resp {
char ntlmv2_hash[CIFS_ENCPWD_SIZE];
__le32 blob_signature;
__u32 reserved;
__le64 time;
__u64 client_chal; /* random */
__u32 reserved2;
/* array of name entries could follow ending in minimum 4 byte struct */
} __packed;
/* per smb session structure/fields */
struct ntlmssp_auth {
/* whether session key is per smb session */
bool sesskey_per_smbsess;
/* sent by client in type 1 ntlmsssp exchange */
__u32 client_flags;
/* sent by server in type 2 ntlmssp exchange */
__u32 conn_flags;
/* sent to server */
unsigned char ciphertext[CIFS_CPHTXT_SIZE];
/* used by ntlmssp */
char cryptkey[CIFS_CRYPTO_KEY_SIZE];
};
#endif /* __KSMBD_NTLMSSP_H */
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