From 6afd2e83cd86b17b074e1854d063b8ec590d7f5b Mon Sep 17 00:00:00 2001 From: Vlad Yasevich Date: Thu, 20 Dec 2007 14:08:04 -0800 Subject: [PATCH] [SCTP]: Discard unauthenticated ASCONF and ASCONF ACK chunks Now that we support AUTH, discard unauthenticated ASCONF and ASCONF ACK chunks as mandated in the ADD-IP spec. Signed-off-by: Vlad Yasevich Signed-off-by: David S. Miller --- net/sctp/sm_statefuns.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c index d247ed4ee423..b6aaa7e97d82 100644 --- a/net/sctp/sm_statefuns.c +++ b/net/sctp/sm_statefuns.c @@ -3377,6 +3377,15 @@ sctp_disposition_t sctp_sf_do_asconf(const struct sctp_endpoint *ep, return sctp_sf_pdiscard(ep, asoc, type, arg, commands); } + /* ADD-IP: Section 4.1.1 + * This chunk MUST be sent in an authenticated way by using + * the mechanism defined in [I-D.ietf-tsvwg-sctp-auth]. If this chunk + * is received unauthenticated it MUST be silently discarded as + * described in [I-D.ietf-tsvwg-sctp-auth]. + */ + if (!sctp_addip_noauth && !chunk->auth) + return sctp_sf_discard_chunk(ep, asoc, type, arg, commands); + /* Make sure that the ASCONF ADDIP chunk has a valid length. */ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_addip_chunk_t))) return sctp_sf_violation_chunklen(ep, asoc, type, arg, @@ -3463,6 +3472,15 @@ sctp_disposition_t sctp_sf_do_asconf_ack(const struct sctp_endpoint *ep, return sctp_sf_pdiscard(ep, asoc, type, arg, commands); } + /* ADD-IP, Section 4.1.2: + * This chunk MUST be sent in an authenticated way by using + * the mechanism defined in [I-D.ietf-tsvwg-sctp-auth]. If this chunk + * is received unauthenticated it MUST be silently discarded as + * described in [I-D.ietf-tsvwg-sctp-auth]. + */ + if (!sctp_addip_noauth && !asconf_ack->auth) + return sctp_sf_discard_chunk(ep, asoc, type, arg, commands); + /* Make sure that the ADDIP chunk has a valid length. */ if (!sctp_chunk_length_valid(asconf_ack, sizeof(sctp_addip_chunk_t))) return sctp_sf_violation_chunklen(ep, asoc, type, arg, -- 2.20.1