gssd_krb5: arcfour-hmac support

For arcfour-hmac support, the make_checksum function needs a usage
field to correctly calculate the checksum differently for MIC and
WRAP tokens.
Signed-off-by: Kevin Coffman <kwc@citi.umich.edu>
Signed-off-by: Steve Dickson <steved@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

include/linux/sunrpc/gss_krb5.h

@@ -235,12 +235,12 @@ enum seal_alg {
 u32
 make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen,
 		struct xdr_buf *body, int body_offset, u8 *cksumkey,
-		struct xdr_netobj *cksumout);
+		unsigned int usage, struct xdr_netobj *cksumout);
 
 u32
 make_checksum_v2(struct krb5_ctx *, char *header, int hdrlen,
 		 struct xdr_buf *body, int body_offset, u8 *key,
-		 struct xdr_netobj *cksum);
+		 unsigned int usage, struct xdr_netobj *cksum);
 
 u32 gss_get_mic_kerberos(struct gss_ctx *, struct xdr_buf *,
 		struct xdr_netobj *);

net/sunrpc/auth_gss/gss_krb5_crypto.c

@@ -132,7 +132,7 @@ checksummer(struct scatterlist *sg, void *data)
 u32
 make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen,
 	      struct xdr_buf *body, int body_offset, u8 *cksumkey,
-	      struct xdr_netobj *cksumout)
+	      unsigned int usage, struct xdr_netobj *cksumout)
 {
 	struct hash_desc                desc;
 	struct scatterlist              sg[1];
@@ -208,7 +208,7 @@ make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen,
 u32
 make_checksum_v2(struct krb5_ctx *kctx, char *header, int hdrlen,
 		 struct xdr_buf *body, int body_offset, u8 *cksumkey,
-		 struct xdr_netobj *cksumout)
+		 unsigned int usage, struct xdr_netobj *cksumout)
 {
 	struct hash_desc desc;
 	struct scatterlist sg[1];
@@ -537,15 +537,18 @@ gss_krb5_aes_encrypt(struct krb5_ctx *kctx, u32 offset,
 	int nblocks, nbytes;
 	struct encryptor_desc desc;
 	u32 cbcbytes;
+	unsigned int usage;
 
 	if (kctx->initiate) {
 		cipher = kctx->initiator_enc;
 		aux_cipher = kctx->initiator_enc_aux;
 		cksumkey = kctx->initiator_integ;
+		usage = KG_USAGE_INITIATOR_SEAL;
 	} else {
 		cipher = kctx->acceptor_enc;
 		aux_cipher = kctx->acceptor_enc_aux;
 		cksumkey = kctx->acceptor_integ;
+		usage = KG_USAGE_ACCEPTOR_SEAL;
 	}
 	blocksize = crypto_blkcipher_blocksize(cipher);
 
@@ -590,7 +593,8 @@ gss_krb5_aes_encrypt(struct krb5_ctx *kctx, u32 offset,
 	buf->pages = pages;
 
 	err = make_checksum_v2(kctx, NULL, 0, buf,
-			       offset + GSS_KRB5_TOK_HDR_LEN, cksumkey, &hmac);
+			       offset + GSS_KRB5_TOK_HDR_LEN,
+			       cksumkey, usage, &hmac);
 	buf->pages = save_pages;
 	if (err)
 		return GSS_S_FAILURE;
@@ -654,15 +658,18 @@ gss_krb5_aes_decrypt(struct krb5_ctx *kctx, u32 offset, struct xdr_buf *buf,
 	u8 pkt_hmac[GSS_KRB5_MAX_CKSUM_LEN];
 	int nblocks, blocksize, cbcbytes;
 	struct decryptor_desc desc;
+	unsigned int usage;
 
 	if (kctx->initiate) {
 		cipher = kctx->acceptor_enc;
 		aux_cipher = kctx->acceptor_enc_aux;
 		cksum_key = kctx->acceptor_integ;
+		usage = KG_USAGE_ACCEPTOR_SEAL;
 	} else {
 		cipher = kctx->initiator_enc;
 		aux_cipher = kctx->initiator_enc_aux;
 		cksum_key = kctx->initiator_integ;
+		usage = KG_USAGE_INITIATOR_SEAL;
 	}
 	blocksize = crypto_blkcipher_blocksize(cipher);
 
@@ -705,7 +712,7 @@ gss_krb5_aes_decrypt(struct krb5_ctx *kctx, u32 offset, struct xdr_buf *buf,
 	our_hmac_obj.data = our_hmac;
 
 	ret = make_checksum_v2(kctx, NULL, 0, &subbuf, 0,
-			       cksum_key, &our_hmac_obj);
+			       cksum_key, usage, &our_hmac_obj);
 	if (ret)
 		goto out_err;
 

net/sunrpc/auth_gss/gss_krb5_seal.c

@@ -142,7 +142,8 @@ gss_get_mic_v1(struct krb5_ctx *ctx, struct xdr_buf *text,
 	else
 		cksumkey = NULL;
 
-	if (make_checksum(ctx, ptr, 8, text, 0, cksumkey, &md5cksum))
+	if (make_checksum(ctx, ptr, 8, text, 0, cksumkey,
+			  KG_USAGE_SIGN, &md5cksum))
 		return GSS_S_FAILURE;
 
 	memcpy(ptr + GSS_KRB5_TOK_HDR_LEN, md5cksum.data, md5cksum.len);
@@ -170,6 +171,7 @@ gss_get_mic_v2(struct krb5_ctx *ctx, struct xdr_buf *text,
 	s32 now;
 	u64 seq_send;
 	u8 *cksumkey;
+	unsigned int cksum_usage;
 
 	dprintk("RPC:       %s\n", __func__);
 
@@ -182,13 +184,16 @@ gss_get_mic_v2(struct krb5_ctx *ctx, struct xdr_buf *text,
 	spin_unlock(&krb5_seq_lock);
 	*((u64 *)(krb5_hdr + 8)) = cpu_to_be64(seq_send);
 
-	if (ctx->initiate)
+	if (ctx->initiate) {
 		cksumkey = ctx->initiator_sign;
-	else
+		cksum_usage = KG_USAGE_INITIATOR_SIGN;
+	} else {
 		cksumkey = ctx->acceptor_sign;
+		cksum_usage = KG_USAGE_ACCEPTOR_SIGN;
+	}
 
 	if (make_checksum_v2(ctx, krb5_hdr, GSS_KRB5_TOK_HDR_LEN,
-			     text, 0, cksumkey, &cksumobj))
+			     text, 0, cksumkey, cksum_usage, &cksumobj))
 		return GSS_S_FAILURE;
 
 	memcpy(krb5_hdr + GSS_KRB5_TOK_HDR_LEN, cksumobj.data, cksumobj.len);

net/sunrpc/auth_gss/gss_krb5_unseal.c

@@ -115,7 +115,7 @@ gss_verify_mic_v1(struct krb5_ctx *ctx,
 		cksumkey = NULL;
 
 	if (make_checksum(ctx, ptr, 8, message_buffer, 0,
-			  cksumkey, &md5cksum))
+			  cksumkey, KG_USAGE_SIGN, &md5cksum))
 		return GSS_S_FAILURE;
 
 	if (memcmp(md5cksum.data, ptr + GSS_KRB5_TOK_HDR_LEN,
@@ -154,6 +154,7 @@ gss_verify_mic_v2(struct krb5_ctx *ctx,
 	u8 *cksumkey;
 	u8 flags;
 	int i;
+	unsigned int cksum_usage;
 
 	dprintk("RPC:       %s\n", __func__);
 
@@ -174,13 +175,16 @@ gss_verify_mic_v2(struct krb5_ctx *ctx,
 		if (ptr[i] != 0xff)
 			return GSS_S_DEFECTIVE_TOKEN;
 
-	if (ctx->initiate)
+	if (ctx->initiate) {
 		cksumkey = ctx->acceptor_sign;
-	else
+		cksum_usage = KG_USAGE_ACCEPTOR_SIGN;
+	} else {
 		cksumkey = ctx->initiator_sign;
+		cksum_usage = KG_USAGE_INITIATOR_SIGN;
+	}
 
 	if (make_checksum_v2(ctx, ptr, GSS_KRB5_TOK_HDR_LEN, message_buffer, 0,
-			     cksumkey, &cksumobj))
+			     cksumkey, cksum_usage, &cksumobj))
 		return GSS_S_FAILURE;
 
 	if (memcmp(cksumobj.data, ptr + GSS_KRB5_TOK_HDR_LEN,

net/sunrpc/auth_gss/gss_krb5_wrap.c

@@ -215,7 +215,7 @@ gss_wrap_kerberos_v1(struct krb5_ctx *kctx, int offset,
 	tmp_pages = buf->pages;
 	buf->pages = pages;
 	if (make_checksum(kctx, ptr, 8, buf, offset + headlen - blocksize,
-					cksumkey, &md5cksum))
+					cksumkey, KG_USAGE_SEAL, &md5cksum))
 		return GSS_S_FAILURE;
 	buf->pages = tmp_pages;
 
@@ -298,7 +298,7 @@ gss_unwrap_kerberos_v1(struct krb5_ctx *kctx, int offset, struct xdr_buf *buf)
 		cksumkey = NULL;
 
 	if (make_checksum(kctx, ptr, 8, buf, crypt_offset,
-						cksumkey, &md5cksum))
+					cksumkey, KG_USAGE_SEAL, &md5cksum))
 		return GSS_S_FAILURE;
 
 	if (memcmp(md5cksum.data, ptr + GSS_KRB5_TOK_HDR_LEN,