diff options
Diffstat (limited to 'net/sctp/endpointola.c')
| -rw-r--r-- | net/sctp/endpointola.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c index 22371185efb..c8d5023606a 100644 --- a/net/sctp/endpointola.c +++ b/net/sctp/endpointola.c @@ -69,12 +69,56 @@ static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep, struct sock *sk, gfp_t gfp) { + struct sctp_hmac_algo_param *auth_hmacs = NULL; + struct sctp_chunks_param *auth_chunks = NULL; + struct sctp_shared_key *null_key; + int err; + memset(ep, 0, sizeof(struct sctp_endpoint)); ep->digest = kzalloc(SCTP_SIGNATURE_SIZE, gfp); if (!ep->digest) return NULL; + if (sctp_auth_enable) { + /* Allocate space for HMACS and CHUNKS authentication + * variables. There are arrays that we encode directly + * into parameters to make the rest of the operations easier. + */ + auth_hmacs = kzalloc(sizeof(sctp_hmac_algo_param_t) + + sizeof(__u16) * SCTP_AUTH_NUM_HMACS, gfp); + if (!auth_hmacs) + goto nomem; + + auth_chunks = kzalloc(sizeof(sctp_chunks_param_t) + + SCTP_NUM_CHUNK_TYPES, gfp); + if (!auth_chunks) + goto nomem; + + /* Initialize the HMACS parameter. + * SCTP-AUTH: Section 3.3 + * Every endpoint supporting SCTP chunk authentication MUST + * support the HMAC based on the SHA-1 algorithm. + */ + auth_hmacs->param_hdr.type = SCTP_PARAM_HMAC_ALGO; + auth_hmacs->param_hdr.length = + htons(sizeof(sctp_paramhdr_t) + 2); + auth_hmacs->hmac_ids[0] = htons(SCTP_AUTH_HMAC_ID_SHA1); + + /* Initialize the CHUNKS parameter */ + auth_chunks->param_hdr.type = SCTP_PARAM_CHUNKS; + + /* If the Add-IP functionality is enabled, we must + * authenticate, ASCONF and ASCONF-ACK chunks + */ + if (sctp_addip_enable) { + auth_chunks->chunks[0] = SCTP_CID_ASCONF; + auth_chunks->chunks[1] = SCTP_CID_ASCONF_ACK; + auth_chunks->param_hdr.length = + htons(sizeof(sctp_paramhdr_t) + 2); + } + } + /* Initialize the base structure. */ /* What type of endpoint are we? */ ep->base.type = SCTP_EP_TYPE_SOCKET; @@ -114,7 +158,36 @@ static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep, ep->last_key = ep->current_key = 0; ep->key_changed_at = jiffies; + /* SCTP-AUTH extensions*/ + INIT_LIST_HEAD(&ep->endpoint_shared_keys); + null_key = sctp_auth_shkey_create(0, GFP_KERNEL); + if (!null_key) + goto nomem; + + list_add(&null_key->key_list, &ep->endpoint_shared_keys); + + /* Allocate and initialize transorms arrays for suported HMACs. */ + err = sctp_auth_init_hmacs(ep, gfp); + if (err) + goto nomem_hmacs; + + /* Add the null key to the endpoint shared keys list and + * set the hmcas and chunks pointers. + */ + ep->auth_hmacs_list = auth_hmacs; + ep->auth_chunk_list = auth_chunks; + return ep; + +nomem_hmacs: + sctp_auth_destroy_keys(&ep->endpoint_shared_keys); +nomem: + /* Free all allocations */ + kfree(auth_hmacs); + kfree(auth_chunks); + kfree(ep->digest); + return NULL; + } /* Create a sctp_endpoint with all that boring stuff initialized. @@ -187,6 +260,16 @@ static void sctp_endpoint_destroy(struct sctp_endpoint *ep) /* Free the digest buffer */ kfree(ep->digest); + /* SCTP-AUTH: Free up AUTH releated data such as shared keys + * chunks and hmacs arrays that were allocated + */ + sctp_auth_destroy_keys(&ep->endpoint_shared_keys); + kfree(ep->auth_hmacs_list); + kfree(ep->auth_chunk_list); + + /* AUTH - Free any allocated HMAC transform containers */ + sctp_auth_destroy_hmacs(ep->auth_hmacs); + /* Cleanup. */ sctp_inq_free(&ep->base.inqueue); sctp_bind_addr_free(&ep->base.bind_addr); |