cifs: have decode_negTokenInit set flags in server struct

...rather than the secType. This allows us to get rid of the MSKerberos
securityEnum. The client just makes a decision at upcall time.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/asn1.c

@@ -492,17 +492,13 @@ compare_oid(unsigned long *oid1, unsigned int oid1len,
 
 int
 decode_negTokenInit(unsigned char *security_blob, int length,
-		    enum securityEnum *secType)
+		    struct TCP_Server_Info *server)
 {
 	struct asn1_ctx ctx;
 	unsigned char *end;
 	unsigned char *sequence_end;
 	unsigned long *oid = NULL;
 	unsigned int cls, con, tag, oidlen, rc;
-	bool use_ntlmssp = false;
-	bool use_kerberos = false;
-	bool use_kerberosu2u = false;
-	bool use_mskerberos = false;
 
 	/* cifs_dump_mem(" Received SecBlob ", security_blob, length); */
 
@@ -599,20 +595,17 @@ decode_negTokenInit(unsigned char *security_blob, int length,
 					*(oid + 1), *(oid + 2), *(oid + 3));
 
 				if (compare_oid(oid, oidlen, MSKRB5_OID,
-						MSKRB5_OID_LEN) &&
-						!use_mskerberos)
-					use_mskerberos = true;
+						MSKRB5_OID_LEN))
+					server->sec_mskerberos = true;
 				else if (compare_oid(oid, oidlen, KRB5U2U_OID,
-						     KRB5U2U_OID_LEN) &&
-						     !use_kerberosu2u)
-					use_kerberosu2u = true;
+						     KRB5U2U_OID_LEN))
+					server->sec_kerberosu2u = true;
 				else if (compare_oid(oid, oidlen, KRB5_OID,
-						     KRB5_OID_LEN) &&
-						     !use_kerberos)
-					use_kerberos = true;
+						     KRB5_OID_LEN))
+					server->sec_kerberos = true;
 				else if (compare_oid(oid, oidlen, NTLMSSP_OID,
 						     NTLMSSP_OID_LEN))
-					use_ntlmssp = true;
+					server->sec_ntlmssp = true;
 
 				kfree(oid);
 			}
@@ -669,12 +662,5 @@ decode_negTokenInit(unsigned char *security_blob, int length,
 	cFYI(1, "Need to call asn1_octets_decode() function for %s",
 		ctx.pointer);	/* is this UTF-8 or ASCII? */
 decode_negtoken_exit:
-	if (use_kerberos)
-		*secType = Kerberos;
-	else if (use_mskerberos)
-		*secType = MSKerberos;
-	else if (use_ntlmssp)
-		*secType = RawNTLMSSP;
-
 	return 1;
 }

fs/cifs/cifs_spnego.c

@@ -133,9 +133,9 @@ cifs_get_spnego_key(struct cifsSesInfo *sesInfo)
 	dp = description + strlen(description);
 
 	/* for now, only sec=krb5 and sec=mskrb5 are valid */
-	if (server->secType == Kerberos)
+	if (server->sec_kerberos)
 		sprintf(dp, ";sec=krb5");
-	else if (server->secType == MSKerberos)
+	else if (server->sec_mskerberos)
 		sprintf(dp, ";sec=mskrb5");
 	else
 		goto out;

fs/cifs/cifsglob.h

@@ -87,7 +87,6 @@ enum securityEnum {
 	RawNTLMSSP,		/* NTLMSSP without SPNEGO, NTLMv2 hash */
 /*	NTLMSSP, */ /* can use rawNTLMSSP instead of NTLMSSP via SPNEGO */
 	Kerberos,		/* Kerberos via SPNEGO */
-	MSKerberos,		/* MS Kerberos via SPNEGO */
 };
 
 enum protocolEnum {
@@ -186,6 +185,11 @@ struct TCP_Server_Info {
 	char ntlmv2_hash[16];
 	unsigned long lstrp; /* when we got last response from this server */
 	u16 dialect; /* dialect index that server chose */
+	/* extended security flavors that server supports */
+	bool	sec_kerberos;		/* supports plain Kerberos */
+	bool	sec_mskerberos;		/* supports legacy MS Kerberos */
+	bool	sec_kerberosu2u;	/* supports U2U Kerberos */
+	bool	sec_ntlmssp;		/* supports NTLMSSP */
 };
 
 /*

fs/cifs/cifsproto.h

@@ -85,7 +85,7 @@ extern struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *);
 extern unsigned int smbCalcSize(struct smb_hdr *ptr);
 extern unsigned int smbCalcSize_LE(struct smb_hdr *ptr);
 extern int decode_negTokenInit(unsigned char *security_blob, int length,
-			enum securityEnum *secType);
+			struct TCP_Server_Info *server);
 extern int cifs_convert_address(char *src, void *dst);
 extern int map_smb_to_linux_error(struct smb_hdr *smb, int logErr);
 extern void header_assemble(struct smb_hdr *, char /* command */ ,

fs/cifs/cifssmb.c

@@ -597,13 +597,19 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
 			server->secType = RawNTLMSSP;
 		} else {
 			rc = decode_negTokenInit(pSMBr->u.extended_response.
-						 SecurityBlob,
-						 count - 16,
-						 &server->secType);
+						 SecurityBlob, count - 16,
+						 server);
 			if (rc == 1)
 				rc = 0;
 			else
 				rc = -EINVAL;
+
+			if (server->sec_kerberos || server->sec_mskerberos)
+				server->secType = Kerberos;
+			else if (server->sec_ntlmssp)
+				server->secType = RawNTLMSSP;
+			else
+				rc = -EOPNOTSUPP;
 		}
 	} else
 		server->capabilities &= ~CAP_EXTENDED_SECURITY;

fs/cifs/sess.c

@@ -751,7 +751,7 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses,
 			unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
 		} else
 			ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
-	} else if (type == Kerberos || type == MSKerberos) {
+	} else if (type == Kerberos) {
 #ifdef CONFIG_CIFS_UPCALL
 		struct cifs_spnego_msg *msg;
 		spnego_key = cifs_get_spnego_key(ses);