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cifs: track the flavor of the NEGOTIATE reponse

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Track what sort of NEGOTIATE response we get from the server, as that
will govern what sort of authentication types this socket will support.

There are three possibilities:

LANMAN: server sent legacy LANMAN-type response

UNENCAP: server sent a newer-style response, but extended security bit
wasn't set. This socket will only support unencapsulated auth types.

EXTENDED: server sent a newer-style response with the extended security
bit set. This is necessary to support krb5 and ntlmssp auth types.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Jeff Layton 2013-05-26 07:00:59 -04:00 committed by Steve French
parent 515d82ffd0
commit e598d1d8fb
3 changed files with 16 additions and 5 deletions
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4
fs/cifs/cifsglob.h
View file

@ -541,6 +541,10 @@ struct TCP_Server_Info {
struct session_key session_key;
unsigned long lstrp; /* when we got last response from this server */
struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
#define CIFS_NEGFLAVOR_LANMAN 0 /* wct == 13, LANMAN */
#define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */
#define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */
char negflavor; /* NEGOTIATE response flavor */
/* extended security flavors that server supports */
bool sec_ntlmssp; /* supports NTLMSSP */
bool sec_kerberosu2u; /* supports U2U Kerberos */

15
fs/cifs/cifssmb.c
View file

@ -615,6 +615,7 @@ CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses)
rc = -EOPNOTSUPP;
goto neg_err_exit;
} else if (pSMBr->hdr.WordCount == 13) {
server->negflavor = CIFS_NEGFLAVOR_LANMAN;
rc = decode_lanman_negprot_rsp(server, pSMBr, secFlags);
goto signing_check;
} else if (pSMBr->hdr.WordCount != 17) {
@ -666,17 +667,21 @@ CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses)
server->timeAdj = (int)(__s16)le16_to_cpu(pSMBr->ServerTimeZone);
server->timeAdj *= 60;
if (pSMBr->EncryptionKeyLength == CIFS_CRYPTO_KEY_SIZE)
if (pSMBr->EncryptionKeyLength == CIFS_CRYPTO_KEY_SIZE) {
server->negflavor = CIFS_NEGFLAVOR_UNENCAP;
memcpy(ses->server->cryptkey, pSMBr->u.EncryptionKey,
CIFS_CRYPTO_KEY_SIZE);
else if ((pSMBr->hdr.Flags2 & SMBFLG2_EXT_SEC ||
} else if ((pSMBr->hdr.Flags2 & SMBFLG2_EXT_SEC ||
server->capabilities & CAP_EXTENDED_SECURITY) &&
(pSMBr->EncryptionKeyLength == 0))
(pSMBr->EncryptionKeyLength == 0)) {
server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
rc = decode_ext_sec_blob(server, pSMBr);
else if (server->sec_mode & SECMODE_PW_ENCRYPT)
} else if (server->sec_mode & SECMODE_PW_ENCRYPT) {
rc = -EIO; /* no crypt key only if plain text pwd */
else
} else {
server->negflavor = CIFS_NEGFLAVOR_UNENCAP;
server->capabilities &= ~CAP_EXTENDED_SECURITY;
}
signing_check:
if (!rc)

2
fs/cifs/smb2pdu.c
View file

@ -405,6 +405,8 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
}
server->dialect = le16_to_cpu(rsp->DialectRevision);
/* SMB2 only has an extended negflavor */
server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
server->max_read = le32_to_cpu(rsp->MaxReadSize);
server->max_write = le32_to_cpu(rsp->MaxWriteSize);