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Fix encryption labels and lengths for SMB3.1.1 

SMB3.1.1 is most secure and recent dialect. Fixup labels and lengths
for sMB3.1.1 signing and encryption.

Signed-off-by: Steve French <smfrench@gmail.com>
CC: Stable <stable@vger.kernel.org>
This commit is contained in:
Steve French 2017-09-25 20:11:58 -05:00
parent 3e0cc09a3a
commit 06e2290844
2 changed files with 20 additions and 14 deletions
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8
fs/cifs/cifsglob.h
View File

@ -661,7 +661,9 @@ struct TCP_Server_Info {
#endif
unsigned int max_read;
unsigned int max_write;
__u8 preauth_hash[512];
#ifdef CONFIG_CIFS_SMB311
__u8 preauth_sha_hash[64]; /* save initital negprot hash */
#endif /* 3.1.1 */
struct delayed_work reconnect; /* reconnect workqueue job */
struct mutex reconnect_mutex; /* prevent simultaneous reconnects */
unsigned long echo_interval;
@ -849,7 +851,9 @@ struct cifs_ses {
__u8 smb3signingkey[SMB3_SIGN_KEY_SIZE];
__u8 smb3encryptionkey[SMB3_SIGN_KEY_SIZE];
__u8 smb3decryptionkey[SMB3_SIGN_KEY_SIZE];
__u8 preauth_hash[512];
#ifdef CONFIG_CIFS_SMB311
__u8 preauth_sha_hash[64];
#endif /* 3.1.1 */
};
static inline bool

26
fs/cifs/smb2transport.c
View File

@ -390,6 +390,7 @@ generate_smb30signingkey(struct cifs_ses *ses)
return generate_smb3signingkey(ses, &triplet);
}
#ifdef CONFIG_CIFS_SMB311
int
generate_smb311signingkey(struct cifs_ses *ses)
@ -398,25 +399,26 @@ generate_smb311signingkey(struct cifs_ses *ses)
struct derivation *d;
d = &triplet.signing;
d->label.iov_base = "SMB2AESCMAC";
d->label.iov_len = 12;
d->context.iov_base = "SmbSign";
d->context.iov_len = 8;
d->label.iov_base = "SMBSigningKey";
d->label.iov_len = 14;
d->context.iov_base = ses->preauth_sha_hash;
d->context.iov_len = 64;
d = &triplet.encryption;
d->label.iov_base = "SMB2AESCCM";
d->label.iov_len = 11;
d->context.iov_base = "ServerIn ";
d->context.iov_len = 10;
d->label.iov_base = "SMBC2SCipherKey";
d->label.iov_len = 16;
d->context.iov_base = ses->preauth_sha_hash;
d->context.iov_len = 64;
d = &triplet.decryption;
d->label.iov_base = "SMB2AESCCM";
d->label.iov_len = 11;
d->context.iov_base = "ServerOut";
d->context.iov_len = 10;
d->label.iov_base = "SMBS2CCipherKey";
d->label.iov_len = 16;
d->context.iov_base = ses->preauth_sha_hash;
d->context.iov_len = 64;
return generate_smb3signingkey(ses, &triplet);
}
#endif /* 311 */
int
smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)