net: sctp: remove unused multiple cookie keys

Vlad says: The whole multiple cookie keys code is completely unused
and has been all this time. Noone uses anything other then the
secret_key[0] since there is no changeover support anywhere.

Thus, for now clean up its left-over fragments.

Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/sctp/constants.h b/include/net/sctp/constants.h
index c29707d..a7dd5c5 100644 (file)
--- a/include/net/sctp/constants.h
+++ b/include/net/sctp/constants.h
@@ -303,7 +303,7 @@ enum { SCTP_MAX_GABS = 16 };
                                          * to which we will raise the P-MTU.
                                         */
 #define SCTP_DEFAULT_MINSEGMENT 512    /* MTU size ... if no mtu disc */
-#define SCTP_HOW_MANY_SECRETS 2                /* How many secrets I keep */
+
 #define SCTP_SECRET_SIZE 32            /* Number of octets in a 256 bits. */
 
 #define SCTP_SIGNATURE_SIZE 20         /* size of a SLA-1 signature */

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index fdeb85a..0e0f9d2 100644 (file)
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -1236,10 +1236,7 @@ struct sctp_endpoint {
         *            Discussion in [RFC1750] can be helpful in
         *            selection of the key.
         */
-       __u8 secret_key[SCTP_HOW_MANY_SECRETS][SCTP_SECRET_SIZE];
-       int current_key;
-       int last_key;
-       int key_changed_at;
+       __u8 secret_key[SCTP_SECRET_SIZE];
 
        /* digest:  This is a digest of the sctp cookie.  This field is
         *          only used on the receive path when we try to validate

diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
index 1a9c5fb..73aad3d 100644 (file)
--- a/net/sctp/endpointola.c
+++ b/net/sctp/endpointola.c
@@ -151,9 +151,7 @@ static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
        ep->rcvbuf_policy = net->sctp.rcvbuf_policy;
 
        /* Initialize the secret key used with cookie. */
-       get_random_bytes(&ep->secret_key[0], SCTP_SECRET_SIZE);
-       ep->last_key = ep->current_key = 0;
-       ep->key_changed_at = jiffies;
+       get_random_bytes(ep->secret_key, sizeof(ep->secret_key));
 
        /* SCTP-AUTH extensions*/
        INIT_LIST_HEAD(&ep->endpoint_shared_keys);
@@ -249,8 +247,6 @@ void sctp_endpoint_free(struct sctp_endpoint *ep)
 /* Final destructor for endpoint.  */
 static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
 {
-       int i;
-
        SCTP_ASSERT(ep->base.dead, "Endpoint is not dead", return);
 
        /* Free up the HMAC transform. */
@@ -273,8 +269,7 @@ static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
        sctp_inq_free(&ep->base.inqueue);
        sctp_bind_addr_free(&ep->base.bind_addr);
 
-       for (i = 0; i < SCTP_HOW_MANY_SECRETS; ++i)
-               memset(&ep->secret_key[i], 0, SCTP_SECRET_SIZE);
+       memset(ep->secret_key, 0, sizeof(ep->secret_key));
 
        /* Remove and free the port */
        if (sctp_sk(ep->base.sk)->bind_hash)

diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index e1c5fc2..a193f3b 100644 (file)
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -1589,8 +1589,6 @@ static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
        struct sctp_signed_cookie *cookie;
        struct scatterlist sg;
        int headersize, bodysize;
-       unsigned int keylen;
-       char *key;
 
        /* Header size is static data prior to the actual cookie, including
         * any padding.
@@ -1650,12 +1648,11 @@ static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
 
                /* Sign the message.  */
                sg_init_one(&sg, &cookie->c, bodysize);
-               keylen = SCTP_SECRET_SIZE;
-               key = (char *)ep->secret_key[ep->current_key];
                desc.tfm = sctp_sk(ep->base.sk)->hmac;
                desc.flags = 0;
 
-               if (crypto_hash_setkey(desc.tfm, key, keylen) ||
+               if (crypto_hash_setkey(desc.tfm, ep->secret_key,
+                                      sizeof(ep->secret_key)) ||
                    crypto_hash_digest(&desc, &sg, bodysize, cookie->signature))
                        goto free_cookie;
        }
@@ -1682,8 +1679,7 @@ struct sctp_association *sctp_unpack_cookie(
        int headersize, bodysize, fixed_size;
        __u8 *digest = ep->digest;
        struct scatterlist sg;
-       unsigned int keylen, len;
-       char *key;
+       unsigned int len;
        sctp_scope_t scope;
        struct sk_buff *skb = chunk->skb;
        struct timeval tv;
@@ -1718,34 +1714,21 @@ struct sctp_association *sctp_unpack_cookie(
                goto no_hmac;
 
        /* Check the signature.  */
-       keylen = SCTP_SECRET_SIZE;
        sg_init_one(&sg, bear_cookie, bodysize);
-       key = (char *)ep->secret_key[ep->current_key];
        desc.tfm = sctp_sk(ep->base.sk)->hmac;
        desc.flags = 0;
 
        memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
-       if (crypto_hash_setkey(desc.tfm, key, keylen) ||
+       if (crypto_hash_setkey(desc.tfm, ep->secret_key,
+                              sizeof(ep->secret_key)) ||
            crypto_hash_digest(&desc, &sg, bodysize, digest)) {
                *error = -SCTP_IERROR_NOMEM;
                goto fail;
        }
 
        if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
-               /* Try the previous key. */
-               key = (char *)ep->secret_key[ep->last_key];
-               memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
-               if (crypto_hash_setkey(desc.tfm, key, keylen) ||
-                   crypto_hash_digest(&desc, &sg, bodysize, digest)) {
-                       *error = -SCTP_IERROR_NOMEM;
-                       goto fail;
-               }
-
-               if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
-                       /* Yikes!  Still bad signature! */
-                       *error = -SCTP_IERROR_BAD_SIG;
-                       goto fail;
-               }
+               *error = -SCTP_IERROR_BAD_SIG;
+               goto fail;
        }
 
 no_hmac: