RxRPC: Allow key payloads to be passed in XDR form

Allow add_key() and KEYCTL_INSTANTIATE to accept key payloads in XDR form as
described by openafs-1.4.10/src/auth/afs_token.xg.  This provides a way of
passing kaserver, Kerberos 4, Kerberos 5 and GSSAPI keys from userspace, and
allows for future expansion.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 21 insertions, 20 deletions

diff --git a/net/rxrpc/rxkad.c b/net/rxrpc/rxkad.c
index acec76292c0..713ac593e2e 100644
--- a/net/rxrpc/rxkad.c
+++ b/net/rxrpc/rxkad.c
@@ -18,6 +18,7 @@
 #include <linux/ctype.h>
 #include <net/sock.h>
 #include <net/af_rxrpc.h>
+#include <keys/rxrpc-type.h>
 #define rxrpc_debug rxkad_debug
 #include "ar-internal.h"
 
@@ -59,14 +60,14 @@ static DEFINE_MUTEX(rxkad_ci_mutex);
  */
 static int rxkad_init_connection_security(struct rxrpc_connection *conn)
 {
-	struct rxrpc_key_payload *payload;
 	struct crypto_blkcipher *ci;
+	struct rxrpc_key_token *token;
 	int ret;
 
 	_enter("{%d},{%x}", conn->debug_id, key_serial(conn->key));
 
-	payload = conn->key->payload.data;
-	conn->security_ix = payload->k.security_index;
+	token = conn->key->payload.data;
+	conn->security_ix = token->security_index;
 
 	ci = crypto_alloc_blkcipher("pcbc(fcrypt)", 0, CRYPTO_ALG_ASYNC);
 	if (IS_ERR(ci)) {
@@ -75,8 +76,8 @@ static int rxkad_init_connection_security(struct rxrpc_connection *conn)
 		goto error;
 	}
 
-	if (crypto_blkcipher_setkey(ci, payload->k.session_key,
-				    sizeof(payload->k.session_key)) < 0)
+	if (crypto_blkcipher_setkey(ci, token->kad->session_key,
+				    sizeof(token->kad->session_key)) < 0)
 		BUG();
 
 	switch (conn->security_level) {
@@ -110,7 +111,7 @@ error:
  */
 static void rxkad_prime_packet_security(struct rxrpc_connection *conn)
 {
-	struct rxrpc_key_payload *payload;
+	struct rxrpc_key_token *token;
 	struct blkcipher_desc desc;
 	struct scatterlist sg[2];
 	struct rxrpc_crypt iv;
@@ -123,8 +124,8 @@ static void rxkad_prime_packet_security(struct rxrpc_connection *conn)
 	if (!conn->key)
 		return;
 
-	payload = conn->key->payload.data;
-	memcpy(&iv, payload->k.session_key, sizeof(iv));
+	token = conn->key->payload.data;
+	memcpy(&iv, token->kad->session_key, sizeof(iv));
 
 	desc.tfm = conn->cipher;
 	desc.info = iv.x;
@@ -197,7 +198,7 @@ static int rxkad_secure_packet_encrypt(const struct rxrpc_call *call,
 					u32 data_size,
 					void *sechdr)
 {
-	const struct rxrpc_key_payload *payload;
+	const struct rxrpc_key_token *token;
 	struct rxkad_level2_hdr rxkhdr
 		__attribute__((aligned(8))); /* must be all on one page */
 	struct rxrpc_skb_priv *sp;
@@ -219,8 +220,8 @@ static int rxkad_secure_packet_encrypt(const struct rxrpc_call *call,
 	rxkhdr.checksum = 0;
 
 	/* encrypt from the session key */
-	payload = call->conn->key->payload.data;
-	memcpy(&iv, payload->k.session_key, sizeof(iv));
+	token = call->conn->key->payload.data;
+	memcpy(&iv, token->kad->session_key, sizeof(iv));
 	desc.tfm = call->conn->cipher;
 	desc.info = iv.x;
 	desc.flags = 0;
@@ -400,7 +401,7 @@ static int rxkad_verify_packet_encrypt(const struct rxrpc_call *call,
 				       struct sk_buff *skb,
 				       u32 *_abort_code)
 {
-	const struct rxrpc_key_payload *payload;
+	const struct rxrpc_key_token *token;
 	struct rxkad_level2_hdr sechdr;
 	struct rxrpc_skb_priv *sp;
 	struct blkcipher_desc desc;
@@ -431,8 +432,8 @@ static int rxkad_verify_packet_encrypt(const struct rxrpc_call *call,
 	skb_to_sgvec(skb, sg, 0, skb->len);
 
 	/* decrypt from the session key */
-	payload = call->conn->key->payload.data;
-	memcpy(&iv, payload->k.session_key, sizeof(iv));
+	token = call->conn->key->payload.data;
+	memcpy(&iv, token->kad->session_key, sizeof(iv));
 	desc.tfm = call->conn->cipher;
 	desc.info = iv.x;
 	desc.flags = 0;
@@ -737,7 +738,7 @@ static int rxkad_respond_to_challenge(struct rxrpc_connection *conn,
 				      struct sk_buff *skb,
 				      u32 *_abort_code)
 {
-	const struct rxrpc_key_payload *payload;
+	const struct rxrpc_key_token *token;
 	struct rxkad_challenge challenge;
 	struct rxkad_response resp
 		__attribute__((aligned(8))); /* must be aligned for crypto */
@@ -778,7 +779,7 @@ static int rxkad_respond_to_challenge(struct rxrpc_connection *conn,
 	if (conn->security_level < min_level)
 		goto protocol_error;
 
-	payload = conn->key->payload.data;
+	token = conn->key->payload.data;
 
 	/* build the response packet */
 	memset(&resp, 0, sizeof(resp));
@@ -797,13 +798,13 @@ static int rxkad_respond_to_challenge(struct rxrpc_connection *conn,
 		(conn->channels[3] ? conn->channels[3]->call_id : 0);
 	resp.encrypted.inc_nonce = htonl(nonce + 1);
 	resp.encrypted.level = htonl(conn->security_level);
-	resp.kvno = htonl(payload->k.kvno);
-	resp.ticket_len = htonl(payload->k.ticket_len);
+	resp.kvno = htonl(token->kad->kvno);
+	resp.ticket_len = htonl(token->kad->ticket_len);
 
 	/* calculate the response checksum and then do the encryption */
 	rxkad_calc_response_checksum(&resp);
-	rxkad_encrypt_response(conn, &resp, &payload->k);
-	return rxkad_send_response(conn, &sp->hdr, &resp, &payload->k);
+	rxkad_encrypt_response(conn, &resp, token->kad);
+	return rxkad_send_response(conn, &sp->hdr, &resp, token->kad);
 
 protocol_error:
 	*_abort_code = abort_code;