rpc: spkm3 update

This updates the spkm3 code to bring it up to date with our current
understanding of the spkm3 spec.

In doing so, we're changing the downcall format used by gssd in the spkm3 case,
which will cause an incompatilibity with old userland spkm3 support.  Since the
old code a) didn't implement the protocol correctly, and b) was never
distributed except in the form of some experimental patches from the citi web
site, we're assuming this is OK.

We do detect the old downcall format and print warning (and fail).  We also
include a version number in the new downcall format, to be used in the
future in case any further change is required.

In some more detail:

	- fix integrity support
	- removed dependency on NIDs. instead OIDs are used
	- known OID values for algorithms added.
	- fixed some context fields and types

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 14 insertions, 20 deletions

diff --git a/include/linux/sunrpc/gss_spkm3.h b/include/linux/sunrpc/gss_spkm3.h
index 2cf3fbb40b4..e3e6a3437f8 100644
--- a/include/linux/sunrpc/gss_spkm3.h
+++ b/include/linux/sunrpc/gss_spkm3.h
@@ -12,27 +12,19 @@
 #include <linux/sunrpc/gss_asn1.h>
 
 struct spkm3_ctx {
-	struct xdr_netobj	ctx_id; /* per message context id */
-	int			qop;         /* negotiated qop */
+	struct xdr_netobj	ctx_id;  /* per message context id */
+	int			endtime; /* endtime of the context */
 	struct xdr_netobj	mech_used;
 	unsigned int		ret_flags ;
-	unsigned int		req_flags ;
-	struct xdr_netobj	share_key;
-	int			conf_alg;
-	struct crypto_blkcipher	*derived_conf_key;
-	int			intg_alg;
-	struct crypto_blkcipher	*derived_integ_key;
-	int			keyestb_alg;   /* alg used to get share_key */
-	int			owf_alg;   /* one way function */
+	struct xdr_netobj	conf_alg;
+	struct xdr_netobj	derived_conf_key;
+	struct xdr_netobj	intg_alg;
+	struct xdr_netobj 	derived_integ_key;
 };
 
-/* from openssl/objects.h */
-/* XXX need SEAL_ALG_NONE */
-#define NID_md5		4
-#define NID_dhKeyAgreement	28 
-#define NID_des_cbc		31 
-#define NID_sha1		64
-#define NID_cast5_cbc		108
+/* OIDs declarations for K-ALG, I-ALG, C-ALG, and OWF-ALG */
+extern const struct xdr_netobj hmac_md5_oid;
+extern const struct xdr_netobj cast5_cbc_oid;
 
 /* SPKM InnerContext Token types */
 
@@ -46,11 +38,13 @@ u32 spkm3_make_token(struct spkm3_ctx *ctx, struct xdr_buf * text, struct xdr_ne
 u32 spkm3_read_token(struct spkm3_ctx *ctx, struct xdr_netobj *read_token, struct xdr_buf *message_buffer, int toktype);
 
 #define CKSUMTYPE_RSA_MD5            0x0007
+#define CKSUMTYPE_HMAC_MD5           0x0008
 
-s32 make_checksum(s32 cksumtype, char *header, int hdrlen, struct xdr_buf *body,
-                   int body_offset, struct xdr_netobj *cksum);
+s32 make_spkm3_checksum(s32 cksumtype, struct xdr_netobj *key, char *header,
+		unsigned int hdrlen, struct xdr_buf *body,
+		unsigned int body_offset, struct xdr_netobj *cksum);
 void asn1_bitstring_len(struct xdr_netobj *in, int *enclen, int *zerobits);
-int decode_asn1_bitstring(struct xdr_netobj *out, char *in, int enclen, 
+int decode_asn1_bitstring(struct xdr_netobj *out, char *in, int enclen,
                    int explen);
 void spkm3_mic_header(unsigned char **hdrbuf, unsigned int *hdrlen, 
                    unsigned char *ctxhdr, int elen, int zbit);