b8da344b74
In sess_auth_rawntlmssp_authenticate(), the ntlmssp blob is allocated statically and its size is an "empirical" 5*sizeof(struct _AUTHENTICATE_MESSAGE) (320B on x86_64). I don't know where this value comes from or if it was ever appropriate, but it is currently insufficient: the user and domain name in UTF16 could take 1kB by themselves. Because of that, build_ntlmssp_auth_blob() might corrupt memory (out-of-bounds write). The size of ntlmssp_blob in SMB2_sess_setup() is too small too (sizeof(struct _NEGOTIATE_MESSAGE) + 500). This patch allocates the blob dynamically in build_ntlmssp_auth_blob(). Signed-off-by: Jerome Marchand <jmarchan@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com> CC: Stable <stable@vger.kernel.org>
138 lines
5.7 KiB
C
138 lines
5.7 KiB
C
/*
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* fs/cifs/ntlmssp.h
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*
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* Copyright (c) International Business Machines Corp., 2002,2007
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#define NTLMSSP_SIGNATURE "NTLMSSP"
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/* Message Types */
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#define NtLmNegotiate cpu_to_le32(1)
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#define NtLmChallenge cpu_to_le32(2)
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#define NtLmAuthenticate cpu_to_le32(3)
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#define UnknownMessage cpu_to_le32(8)
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/* Negotiate Flags */
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#define NTLMSSP_NEGOTIATE_UNICODE 0x01 /* Text strings are unicode */
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#define NTLMSSP_NEGOTIATE_OEM 0x02 /* Text strings are in OEM */
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#define NTLMSSP_REQUEST_TARGET 0x04 /* Srv returns its auth realm */
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/* define reserved9 0x08 */
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#define NTLMSSP_NEGOTIATE_SIGN 0x0010 /* Request signing capability */
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#define NTLMSSP_NEGOTIATE_SEAL 0x0020 /* Request confidentiality */
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#define NTLMSSP_NEGOTIATE_DGRAM 0x0040
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#define NTLMSSP_NEGOTIATE_LM_KEY 0x0080 /* Use LM session key */
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/* defined reserved 8 0x0100 */
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#define NTLMSSP_NEGOTIATE_NTLM 0x0200 /* NTLM authentication */
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#define NTLMSSP_NEGOTIATE_NT_ONLY 0x0400 /* Lanman not allowed */
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#define NTLMSSP_ANONYMOUS 0x0800
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#define NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED 0x1000 /* reserved6 */
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#define NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED 0x2000
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#define NTLMSSP_NEGOTIATE_LOCAL_CALL 0x4000 /* client/server same machine */
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#define NTLMSSP_NEGOTIATE_ALWAYS_SIGN 0x8000 /* Sign. All security levels */
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#define NTLMSSP_TARGET_TYPE_DOMAIN 0x10000
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#define NTLMSSP_TARGET_TYPE_SERVER 0x20000
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#define NTLMSSP_TARGET_TYPE_SHARE 0x40000
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#define NTLMSSP_NEGOTIATE_EXTENDED_SEC 0x80000 /* NB:not related to NTLMv2 pwd*/
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/* #define NTLMSSP_REQUEST_INIT_RESP 0x100000 */
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#define NTLMSSP_NEGOTIATE_IDENTIFY 0x100000
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#define NTLMSSP_REQUEST_ACCEPT_RESP 0x200000 /* reserved5 */
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#define NTLMSSP_REQUEST_NON_NT_KEY 0x400000
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#define NTLMSSP_NEGOTIATE_TARGET_INFO 0x800000
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/* #define reserved4 0x1000000 */
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#define NTLMSSP_NEGOTIATE_VERSION 0x2000000 /* we do not set */
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/* #define reserved3 0x4000000 */
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/* #define reserved2 0x8000000 */
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/* #define reserved1 0x10000000 */
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#define NTLMSSP_NEGOTIATE_128 0x20000000
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#define NTLMSSP_NEGOTIATE_KEY_XCH 0x40000000
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#define NTLMSSP_NEGOTIATE_56 0x80000000
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/* Define AV Pair Field IDs */
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enum av_field_type {
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NTLMSSP_AV_EOL = 0,
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NTLMSSP_AV_NB_COMPUTER_NAME,
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NTLMSSP_AV_NB_DOMAIN_NAME,
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NTLMSSP_AV_DNS_COMPUTER_NAME,
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NTLMSSP_AV_DNS_DOMAIN_NAME,
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NTLMSSP_AV_DNS_TREE_NAME,
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NTLMSSP_AV_FLAGS,
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NTLMSSP_AV_TIMESTAMP,
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NTLMSSP_AV_RESTRICTION,
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NTLMSSP_AV_TARGET_NAME,
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NTLMSSP_AV_CHANNEL_BINDINGS
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};
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/* Although typedefs are not commonly used for structure definitions */
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/* in the Linux kernel, in this particular case they are useful */
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/* to more closely match the standards document for NTLMSSP from */
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/* OpenGroup and to make the code more closely match the standard in */
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/* appearance */
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typedef struct _SECURITY_BUFFER {
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__le16 Length;
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__le16 MaximumLength;
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__le32 BufferOffset; /* offset to buffer */
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} __attribute__((packed)) SECURITY_BUFFER;
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typedef struct _NEGOTIATE_MESSAGE {
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__u8 Signature[sizeof(NTLMSSP_SIGNATURE)];
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__le32 MessageType; /* NtLmNegotiate = 1 */
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__le32 NegotiateFlags;
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SECURITY_BUFFER DomainName; /* RFC 1001 style and ASCII */
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SECURITY_BUFFER WorkstationName; /* RFC 1001 and ASCII */
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/* SECURITY_BUFFER for version info not present since we
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do not set the version is present flag */
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char DomainString[0];
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/* followed by WorkstationString */
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} __attribute__((packed)) NEGOTIATE_MESSAGE, *PNEGOTIATE_MESSAGE;
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typedef struct _CHALLENGE_MESSAGE {
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__u8 Signature[sizeof(NTLMSSP_SIGNATURE)];
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__le32 MessageType; /* NtLmChallenge = 2 */
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SECURITY_BUFFER TargetName;
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__le32 NegotiateFlags;
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__u8 Challenge[CIFS_CRYPTO_KEY_SIZE];
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__u8 Reserved[8];
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SECURITY_BUFFER TargetInfoArray;
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/* SECURITY_BUFFER for version info not present since we
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do not set the version is present flag */
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} __attribute__((packed)) CHALLENGE_MESSAGE, *PCHALLENGE_MESSAGE;
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typedef struct _AUTHENTICATE_MESSAGE {
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__u8 Signature[sizeof(NTLMSSP_SIGNATURE)];
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__le32 MessageType; /* NtLmsAuthenticate = 3 */
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SECURITY_BUFFER LmChallengeResponse;
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SECURITY_BUFFER NtChallengeResponse;
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SECURITY_BUFFER DomainName;
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SECURITY_BUFFER UserName;
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SECURITY_BUFFER WorkstationName;
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SECURITY_BUFFER SessionKey;
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__le32 NegotiateFlags;
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/* SECURITY_BUFFER for version info not present since we
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do not set the version is present flag */
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char UserString[0];
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} __attribute__((packed)) AUTHENTICATE_MESSAGE, *PAUTHENTICATE_MESSAGE;
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/*
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* Size of the session key (crypto key encrypted with the password
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*/
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int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len, struct cifs_ses *ses);
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void build_ntlmssp_negotiate_blob(unsigned char *pbuffer, struct cifs_ses *ses);
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int build_ntlmssp_auth_blob(unsigned char **pbuffer, u16 *buflen,
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struct cifs_ses *ses,
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const struct nls_table *nls_cp);
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