From: claudio Date: Tue, 9 Jan 2024 14:15:15 +0000 (+0000) Subject: Be more consistent with RTR parse error reporting. X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=4fa7a5b4af81f3dfdf7d6532c53e27a757107f49;p=openbsd Be more consistent with RTR parse error reporting. Stop calling rtr_send_error() after a parse error in rtr_process_msg(); instead move the calls into the parse functions. Use consistend and useful error text to most rtr_send_error() calls. In parse header also check the minimal version for router key and ASPA pdus before checking their length. OK tb@ --- diff --git a/usr.sbin/bgpd/rtr_proto.c b/usr.sbin/bgpd/rtr_proto.c index eeef151880f..64cc9e0da9e 100644 --- a/usr.sbin/bgpd/rtr_proto.c +++ b/usr.sbin/bgpd/rtr_proto.c @@ -1,4 +1,4 @@ -/* $OpenBSD: rtr_proto.c,v 1.24 2024/01/08 16:39:17 claudio Exp $ */ +/* $OpenBSD: rtr_proto.c,v 1.25 2024/01/09 14:15:15 claudio Exp $ */ /* * Copyright (c) 2020 Claudio Jeker @@ -411,9 +411,9 @@ rtr_parse_header(struct rtr_session *rs, struct ibuf *hdr, len = ntohl(rh.length); if (len > RTR_MAX_LEN) { - log_warnx("rtr %s: received %s: msg too big: %zu byte", + log_warnx("rtr %s: received %s: pdu too big: %zu byte", log_rtr(rs), log_rtr_type(rh.type), len); - rtr_send_error(rs, CORRUPT_DATA, "too big", hdr); + rtr_send_error(rs, CORRUPT_DATA, "pdu too big", hdr); return -1; } @@ -432,7 +432,7 @@ rtr_parse_header(struct rtr_session *rs, struct ibuf *hdr, default: log_warnx("rtr %s: received %s: out of context", log_rtr(rs), log_rtr_type(rh.type)); - rtr_send_error(rs, CORRUPT_DATA, NULL, hdr); + rtr_send_error(rs, CORRUPT_DATA, "out of context", hdr); return -1; } } else if (rh.version != rs->version && rh.type != ERROR_REPORT) { @@ -465,23 +465,23 @@ rtr_parse_header(struct rtr_session *rs, struct ibuf *hdr, goto badlen; break; case ROUTER_KEY: - if (len < sizeof(struct rtr_routerkey)) - goto badlen; if (rs->version < 1) goto badversion; + if (len < sizeof(struct rtr_routerkey)) + goto badlen; break; case ERROR_REPORT: if (len < 16) goto badlen; break; case ASPA: - if (len < sizeof(struct rtr_aspa) || (len % 4) != 0) - goto badlen; if (rs->version < 2) goto badversion; + if (len < sizeof(struct rtr_aspa) || (len % 4) != 0) + goto badlen; break; default: - log_warnx("rtr %s: received unknown message: type %s", + log_warnx("rtr %s: received unsupported pdu: type %s", log_rtr(rs), log_rtr_type(rh.type)); rtr_send_error(rs, UNSUPP_PDU_TYPE, NULL, hdr); return -1; @@ -493,7 +493,7 @@ rtr_parse_header(struct rtr_session *rs, struct ibuf *hdr, return 0; badlen: - log_warnx("rtr %s: received %s: bad PDU length: %zu bytes", + log_warnx("rtr %s: received %s: bad pdu length: %zu bytes", log_rtr(rs), log_rtr_type(rh.type), len); rtr_send_error(rs, CORRUPT_DATA, "bad length", hdr); return -1; @@ -515,9 +515,9 @@ rtr_parse_notify(struct rtr_session *rs, struct ibuf *pdu) return 0; if (ibuf_get(pdu, ¬ify, sizeof(notify)) == -1) { - log_warnx("rtr %s: received %s: bad pdu len", + log_warnx("rtr %s: received %s: bad pdu length", log_rtr(rs), log_rtr_type(SERIAL_NOTIFY)); - rtr_send_error(rs, CORRUPT_DATA, "bad len", pdu); + rtr_send_error(rs, CORRUPT_DATA, "bad length", pdu); return -1; } @@ -528,6 +528,7 @@ rtr_parse_notify(struct rtr_session *rs, struct ibuf *pdu) log_warnx("rtr %s: received %s: while in state %s (ignored)", log_rtr(rs), log_rtr_type(SERIAL_NOTIFY), rtr_statenames[rs->state]); + rtr_send_error(rs, CORRUPT_DATA, "out of context", pdu); return 0; } @@ -541,9 +542,9 @@ rtr_parse_cache_response(struct rtr_session *rs, struct ibuf *pdu) struct rtr_response resp; if (ibuf_get(pdu, &resp, sizeof(resp)) == -1) { - log_warnx("rtr %s: received %s: bad pdu len", + log_warnx("rtr %s: received %s: bad pdu length", log_rtr(rs), log_rtr_type(CACHE_RESPONSE)); - rtr_send_error(rs, CORRUPT_DATA, "bad len", pdu); + rtr_send_error(rs, CORRUPT_DATA, "bad length", pdu); return -1; } @@ -557,6 +558,7 @@ rtr_parse_cache_response(struct rtr_session *rs, struct ibuf *pdu) if (rs->state != RTR_STATE_ESTABLISHED) { log_warnx("rtr %s: received %s: out of context", log_rtr(rs), log_rtr_type(CACHE_RESPONSE)); + rtr_send_error(rs, CORRUPT_DATA, "out of context", pdu); return -1; } @@ -571,9 +573,9 @@ rtr_parse_ipv4_prefix(struct rtr_session *rs, struct ibuf *pdu) struct roa *roa; if (ibuf_get(pdu, &ip4, sizeof(ip4)) == -1) { - log_warnx("rtr %s: received %s: bad pdu len", + log_warnx("rtr %s: received %s: bad pdu length", log_rtr(rs), log_rtr_type(IPV4_PREFIX)); - rtr_send_error(rs, CORRUPT_DATA, "bad len", pdu); + rtr_send_error(rs, CORRUPT_DATA, "bad length", pdu); return -1; } @@ -583,7 +585,7 @@ rtr_parse_ipv4_prefix(struct rtr_session *rs, struct ibuf *pdu) if (rs->state != RTR_STATE_EXCHANGE) { log_warnx("rtr %s: received %s: out of context", log_rtr(rs), log_rtr_type(IPV4_PREFIX)); - rtr_send_error(rs, CORRUPT_DATA, NULL, pdu); + rtr_send_error(rs, CORRUPT_DATA, "out of context", pdu); return -1; } @@ -641,9 +643,9 @@ rtr_parse_ipv6_prefix(struct rtr_session *rs, struct ibuf *pdu) struct roa *roa; if (ibuf_get(pdu, &ip6, sizeof(ip6)) == -1) { - log_warnx("rtr %s: received %s: bad pdu len", + log_warnx("rtr %s: received %s: bad pdu length", log_rtr(rs), log_rtr_type(IPV6_PREFIX)); - rtr_send_error(rs, CORRUPT_DATA, "bad len", pdu); + rtr_send_error(rs, CORRUPT_DATA, "bad length", pdu); return -1; } @@ -653,7 +655,7 @@ rtr_parse_ipv6_prefix(struct rtr_session *rs, struct ibuf *pdu) if (rs->state != RTR_STATE_EXCHANGE) { log_warnx("rtr %s: received %s: out of context", log_rtr(rs), log_rtr_type(IPV6_PREFIX)); - rtr_send_error(rs, CORRUPT_DATA, NULL, pdu); + rtr_send_error(rs, CORRUPT_DATA, "out of context", pdu); return -1; } @@ -712,23 +714,23 @@ rtr_parse_aspa(struct rtr_session *rs, struct ibuf *pdu) uint16_t cnt, i; if (ibuf_get(pdu, &rtr_aspa, sizeof(rtr_aspa)) == -1) { - log_warnx("rtr %s: received %s: bad pdu len", + log_warnx("rtr %s: received %s: bad pdu length", log_rtr(rs), log_rtr_type(ASPA)); - rtr_send_error(rs, CORRUPT_DATA, "bad len", pdu); + rtr_send_error(rs, CORRUPT_DATA, "bad length", pdu); return -1; } cnt = ntohs(rtr_aspa.cnt); if (ibuf_size(pdu) != cnt * sizeof(uint32_t)) { - log_warnx("rtr %s: received %s: bad pdu len", + log_warnx("rtr %s: received %s: bad pdu length", log_rtr(rs), log_rtr_type(ASPA)); - rtr_send_error(rs, CORRUPT_DATA, "bad len", pdu); + rtr_send_error(rs, CORRUPT_DATA, "bad length", pdu); return -1; } if (rs->state != RTR_STATE_EXCHANGE) { log_warnx("rtr %s: received %s: out of context", log_rtr(rs), log_rtr_type(ASPA)); - rtr_send_error(rs, CORRUPT_DATA, NULL, pdu); + rtr_send_error(rs, CORRUPT_DATA, "out of context", pdu); return -1; } @@ -758,9 +760,9 @@ rtr_parse_aspa(struct rtr_session *rs, struct ibuf *pdu) } for (i = 0; i < cnt; i++) { if (ibuf_get_n32(pdu, &aspa->tas[i]) == -1) { - log_warnx("rtr %s: received %s: bad pdu len", + log_warnx("rtr %s: received %s: bad pdu length", log_rtr(rs), log_rtr_type(ASPA)); - rtr_send_error(rs, CORRUPT_DATA, "bad len", + rtr_send_error(rs, CORRUPT_DATA, "bad length", pdu); return -1; } @@ -806,8 +808,9 @@ rtr_parse_end_of_data(struct rtr_session *rs, struct ibuf *pdu) uint32_t t; if (ibuf_get(pdu, &eod, sizeof(eod)) == -1) { - log_warnx("rtr %s: received %s: bad pdu len", + log_warnx("rtr %s: received %s: bad pdu length", log_rtr(rs), log_rtr_type(END_OF_DATA)); + rtr_send_error(rs, CORRUPT_DATA, "bad length", pdu); return -1; } @@ -817,6 +820,7 @@ rtr_parse_end_of_data(struct rtr_session *rs, struct ibuf *pdu) if (rs->state != RTR_STATE_EXCHANGE) { log_warnx("rtr %s: received %s: out of context", log_rtr(rs), log_rtr_type(END_OF_DATA)); + rtr_send_error(rs, CORRUPT_DATA, "out of context", pdu); return -1; } @@ -843,6 +847,7 @@ rtr_parse_end_of_data(struct rtr_session *rs, struct ibuf *pdu) bad: log_warnx("rtr %s: received %s: bad timeout values", log_rtr(rs), log_rtr_type(END_OF_DATA)); + rtr_send_error(rs, CORRUPT_DATA, "bad timeout values", pdu); return -1; } @@ -852,8 +857,9 @@ rtr_parse_cache_reset(struct rtr_session *rs, struct ibuf *pdu) struct rtr_reset reset; if (ibuf_get(pdu, &reset, sizeof(reset)) == -1) { - log_warnx("rtr %s: received %s: bad pdu len", + log_warnx("rtr %s: received %s: bad pdu length", log_rtr(rs), log_rtr_type(CACHE_RESET)); + rtr_send_error(rs, CORRUPT_DATA, "bad length", pdu); return -1; } @@ -863,6 +869,7 @@ rtr_parse_cache_reset(struct rtr_session *rs, struct ibuf *pdu) if (rs->state != RTR_STATE_ESTABLISHED) { log_warnx("rtr %s: received %s: out of context", log_rtr(rs), log_rtr_type(CACHE_RESET)); + rtr_send_error(rs, CORRUPT_DATA, "out of context", pdu); return -1; } @@ -977,38 +984,28 @@ rtr_process_msg(struct rtr_session *rs) switch (msgtype) { case SERIAL_NOTIFY: - if (rtr_parse_notify(rs, &msg) == -1) { - rtr_send_error(rs, CORRUPT_DATA, NULL, &msg); + if (rtr_parse_notify(rs, &msg) == -1) return; - } break; case CACHE_RESPONSE: - if (rtr_parse_cache_response(rs, &msg) == -1) { - rtr_send_error(rs, CORRUPT_DATA, NULL, &msg); + if (rtr_parse_cache_response(rs, &msg) == -1) return; - } break; case IPV4_PREFIX: - if (rtr_parse_ipv4_prefix(rs, &msg) == -1) { + if (rtr_parse_ipv4_prefix(rs, &msg) == -1) return; - } break; case IPV6_PREFIX: - if (rtr_parse_ipv6_prefix(rs, &msg) == -1) { + if (rtr_parse_ipv6_prefix(rs, &msg) == -1) return; - } break; case END_OF_DATA: - if (rtr_parse_end_of_data(rs, &msg) == -1) { - rtr_send_error(rs, CORRUPT_DATA, NULL, &msg); + if (rtr_parse_end_of_data(rs, &msg) == -1) return; - } break; case CACHE_RESET: - if (rtr_parse_cache_reset(rs, &msg) == -1) { - rtr_send_error(rs, CORRUPT_DATA, NULL, &msg); + if (rtr_parse_cache_reset(rs, &msg) == -1) return; - } break; case ROUTER_KEY: /* silently ignore router key */ @@ -1020,14 +1017,13 @@ rtr_process_msg(struct rtr_session *rs) } break; case ASPA: - if (rtr_parse_aspa(rs, &msg) == -1) { + if (rtr_parse_aspa(rs, &msg) == -1) return; - } break; default: - log_warnx("rtr %s: received %s: unexpected pdu type", + log_warnx("rtr %s: received %s: unsupported pdu type", log_rtr(rs), log_rtr_type(msgtype)); - rtr_send_error(rs, INVALID_REQUEST, NULL, &msg); + rtr_send_error(rs, UNSUPP_PDU_TYPE, NULL, &msg); return; } }