1 /* SPDX-License-Identifier: LGPL-2.1+ */
2 /*
3  *   Copyright (c) International Business Machines  Corp., 2002,2007
4  *   Author(s): Steve French (sfrench@us.ibm.com)
5  */
6 
7 #ifndef __KSMBD_NTLMSSP_H
8 #define __KSMBD_NTLMSSP_H
9 
10 #define NTLMSSP_SIGNATURE "NTLMSSP"
11 
12 /* Security blob target info data */
13 #define TGT_Name        "KSMBD"
14 
15 /*
16  * Size of the crypto key returned on the negotiate SMB in bytes
17  */
18 #define CIFS_CRYPTO_KEY_SIZE	(8)
19 #define CIFS_KEY_SIZE	(40)
20 
21 /*
22  * Size of encrypted user password in bytes
23  */
24 #define CIFS_ENCPWD_SIZE	(16)
25 #define CIFS_CPHTXT_SIZE	(16)
26 
27 /* Message Types */
28 #define NtLmNegotiate     cpu_to_le32(1)
29 #define NtLmChallenge     cpu_to_le32(2)
30 #define NtLmAuthenticate  cpu_to_le32(3)
31 #define UnknownMessage    cpu_to_le32(8)
32 
33 /* Negotiate Flags */
34 #define NTLMSSP_NEGOTIATE_UNICODE         0x01 /* Text strings are unicode */
35 #define NTLMSSP_NEGOTIATE_OEM             0x02 /* Text strings are in OEM */
36 #define NTLMSSP_REQUEST_TARGET            0x04 /* Srv returns its auth realm */
37 /* define reserved9                       0x08 */
38 #define NTLMSSP_NEGOTIATE_SIGN          0x0010 /* Request signing capability */
39 #define NTLMSSP_NEGOTIATE_SEAL          0x0020 /* Request confidentiality */
40 #define NTLMSSP_NEGOTIATE_DGRAM         0x0040
41 #define NTLMSSP_NEGOTIATE_LM_KEY        0x0080 /* Use LM session key */
42 /* defined reserved 8                   0x0100 */
43 #define NTLMSSP_NEGOTIATE_NTLM          0x0200 /* NTLM authentication */
44 #define NTLMSSP_NEGOTIATE_NT_ONLY       0x0400 /* Lanman not allowed */
45 #define NTLMSSP_ANONYMOUS               0x0800
46 #define NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED 0x1000 /* reserved6 */
47 #define NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED 0x2000
48 #define NTLMSSP_NEGOTIATE_LOCAL_CALL    0x4000 /* client/server same machine */
49 #define NTLMSSP_NEGOTIATE_ALWAYS_SIGN   0x8000 /* Sign. All security levels  */
50 #define NTLMSSP_TARGET_TYPE_DOMAIN     0x10000
51 #define NTLMSSP_TARGET_TYPE_SERVER     0x20000
52 #define NTLMSSP_TARGET_TYPE_SHARE      0x40000
53 #define NTLMSSP_NEGOTIATE_EXTENDED_SEC 0x80000 /* NB:not related to NTLMv2 pwd*/
54 /* #define NTLMSSP_REQUEST_INIT_RESP     0x100000 */
55 #define NTLMSSP_NEGOTIATE_IDENTIFY    0x100000
56 #define NTLMSSP_REQUEST_ACCEPT_RESP   0x200000 /* reserved5 */
57 #define NTLMSSP_REQUEST_NON_NT_KEY    0x400000
58 #define NTLMSSP_NEGOTIATE_TARGET_INFO 0x800000
59 /* #define reserved4                 0x1000000 */
60 #define NTLMSSP_NEGOTIATE_VERSION    0x2000000 /* we do not set */
61 /* #define reserved3                 0x4000000 */
62 /* #define reserved2                 0x8000000 */
63 /* #define reserved1                0x10000000 */
64 #define NTLMSSP_NEGOTIATE_128       0x20000000
65 #define NTLMSSP_NEGOTIATE_KEY_XCH   0x40000000
66 #define NTLMSSP_NEGOTIATE_56        0x80000000
67 
68 /* Define AV Pair Field IDs */
69 enum av_field_type {
70 	NTLMSSP_AV_EOL = 0,
71 	NTLMSSP_AV_NB_COMPUTER_NAME,
72 	NTLMSSP_AV_NB_DOMAIN_NAME,
73 	NTLMSSP_AV_DNS_COMPUTER_NAME,
74 	NTLMSSP_AV_DNS_DOMAIN_NAME,
75 	NTLMSSP_AV_DNS_TREE_NAME,
76 	NTLMSSP_AV_FLAGS,
77 	NTLMSSP_AV_TIMESTAMP,
78 	NTLMSSP_AV_RESTRICTION,
79 	NTLMSSP_AV_TARGET_NAME,
80 	NTLMSSP_AV_CHANNEL_BINDINGS
81 };
82 
83 /* Although typedefs are not commonly used for structure definitions */
84 /* in the Linux kernel, in this particular case they are useful      */
85 /* to more closely match the standards document for NTLMSSP from     */
86 /* OpenGroup and to make the code more closely match the standard in */
87 /* appearance */
88 
89 struct security_buffer {
90 	__le16 Length;
91 	__le16 MaximumLength;
92 	__le32 BufferOffset;	/* offset to buffer */
93 } __packed;
94 
95 struct target_info {
96 	__le16 Type;
97 	__le16 Length;
98 	__u8 Content[];
99 } __packed;
100 
101 struct negotiate_message {
102 	__u8 Signature[sizeof(NTLMSSP_SIGNATURE)];
103 	__le32 MessageType;     /* NtLmNegotiate = 1 */
104 	__le32 NegotiateFlags;
105 	struct security_buffer DomainName;	/* RFC 1001 style and ASCII */
106 	struct security_buffer WorkstationName;	/* RFC 1001 and ASCII */
107 	/*
108 	 * struct security_buffer for version info not present since we
109 	 * do not set the version is present flag
110 	 */
111 	char DomainString[];
112 	/* followed by WorkstationString */
113 } __packed;
114 
115 struct challenge_message {
116 	__u8 Signature[sizeof(NTLMSSP_SIGNATURE)];
117 	__le32 MessageType;   /* NtLmChallenge = 2 */
118 	struct security_buffer TargetName;
119 	__le32 NegotiateFlags;
120 	__u8 Challenge[CIFS_CRYPTO_KEY_SIZE];
121 	__u8 Reserved[8];
122 	struct security_buffer TargetInfoArray;
123 	/*
124 	 * struct security_buffer for version info not present since we
125 	 * do not set the version is present flag
126 	 */
127 } __packed;
128 
129 struct authenticate_message {
130 	__u8 Signature[sizeof(NTLMSSP_SIGNATURE)];
131 	__le32 MessageType;  /* NtLmsAuthenticate = 3 */
132 	struct security_buffer LmChallengeResponse;
133 	struct security_buffer NtChallengeResponse;
134 	struct security_buffer DomainName;
135 	struct security_buffer UserName;
136 	struct security_buffer WorkstationName;
137 	struct security_buffer SessionKey;
138 	__le32 NegotiateFlags;
139 	/*
140 	 * struct security_buffer for version info not present since we
141 	 * do not set the version is present flag
142 	 */
143 	char UserString[];
144 } __packed;
145 
146 struct ntlmv2_resp {
147 	char ntlmv2_hash[CIFS_ENCPWD_SIZE];
148 	__le32 blob_signature;
149 	__u32  reserved;
150 	__le64  time;
151 	__u64  client_chal; /* random */
152 	__u32  reserved2;
153 	/* array of name entries could follow ending in minimum 4 byte struct */
154 } __packed;
155 
156 /* per smb session structure/fields */
157 struct ntlmssp_auth {
158 	/* whether session key is per smb session */
159 	bool		sesskey_per_smbsess;
160 	/* sent by client in type 1 ntlmsssp exchange */
161 	__u32		client_flags;
162 	/* sent by server in type 2 ntlmssp exchange */
163 	__u32		conn_flags;
164 	/* sent to server */
165 	unsigned char	ciphertext[CIFS_CPHTXT_SIZE];
166 	/* used by ntlmssp */
167 	char		cryptkey[CIFS_CRYPTO_KEY_SIZE];
168 };
169 #endif /* __KSMBD_NTLMSSP_H */
170