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nhrp: add cisco-authentication password support
Implemented: - handling 8 char long password, aka Cisco style. - minimal error inidication routine - test case, password change affects conection Signed-off-by: Volodymyr Huti <v.huti@vyos.io>
This commit is contained in:
Volodymyr Huti
Dave LeRoy
parent
d5b0c76edd
commit
51f0700286
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@ -84,6 +84,12 @@ Configuring NHRP
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registration requests are sent. By default registrations are sent every one
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third of the holdtime.
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.. clicmd:: ip nhrp authentication PASSWORD
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Enables Cisco style authentication on NHRP packets. This embeds the
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plaintext password to the outgoing NHRP packets.
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Maximum length of the is 8 characters.
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.. clicmd:: ip nhrp map A.B.C.D|X:X::X:X A.B.C.D|local
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Map an IP address of a station to the station's NBMA address.
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@ -216,7 +216,7 @@ static void nhrp_reg_send_req(struct event *t)
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cie->holding_time = htons(if_ad->holdtime);
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cie->mtu = htons(if_ad->mtu);
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nhrp_ext_request(zb, hdr, ifp);
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nhrp_ext_request(zb, hdr);
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/* Cisco NAT detection extension */
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if (sockunion_family(&r->proto_addr) != AF_UNSPEC) {
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@ -240,7 +240,7 @@ static void nhrp_reg_send_req(struct event *t)
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cie->mtu = htons(if_ad->mtu);
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nhrp_ext_complete(zb, ext);
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nhrp_packet_complete(zb, hdr);
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nhrp_packet_complete(zb, hdr, ifp);
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nhrp_peer_send(r->peer, zb);
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zbuf_free(zb);
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}
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@ -115,14 +115,32 @@ uint16_t nhrp_packet_calculate_checksum(const uint8_t *pdu, uint16_t len)
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return (~csum) & 0xffff;
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}
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void nhrp_packet_complete(struct zbuf *zb, struct nhrp_packet_header *hdr)
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void nhrp_packet_complete(struct zbuf *zb, struct nhrp_packet_header *hdr,
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struct interface *ifp)
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{
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nhrp_packet_complete_auth(zb, hdr, ifp, true);
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}
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void nhrp_packet_complete_auth(struct zbuf *zb, struct nhrp_packet_header *hdr,
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struct interface *ifp, bool auth)
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{
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struct nhrp_interface *nifp = ifp->info;
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struct zbuf *auth_token = nifp->auth_token;
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struct nhrp_extension_header *dst;
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unsigned short size;
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if (auth && auth_token) {
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dst = nhrp_ext_push(zb, hdr,
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NHRP_EXTENSION_AUTHENTICATION |
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NHRP_EXTENSION_FLAG_COMPULSORY);
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zbuf_copy_peek(zb, auth_token, zbuf_size(auth_token));
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nhrp_ext_complete(zb, dst);
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}
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if (hdr->extension_offset)
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nhrp_ext_push(zb, hdr,
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NHRP_EXTENSION_END
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| NHRP_EXTENSION_FLAG_COMPULSORY);
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NHRP_EXTENSION_END |
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NHRP_EXTENSION_FLAG_COMPULSORY);
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size = zb->tail - (uint8_t *)hdr;
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hdr->packet_size = htons(size);
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@ -225,8 +243,7 @@ struct nhrp_extension_header *nhrp_ext_pull(struct zbuf *zb,
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return ext;
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}
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void nhrp_ext_request(struct zbuf *zb, struct nhrp_packet_header *hdr,
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struct interface *ifp)
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void nhrp_ext_request(struct zbuf *zb, struct nhrp_packet_header *hdr)
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{
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/* Place holders for standard extensions */
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nhrp_ext_push(zb, hdr,
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@ -603,7 +603,7 @@ static void nhrp_handle_resolution_req(struct nhrp_packet_parser *pp)
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break;
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}
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}
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nhrp_packet_complete(zb, hdr);
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nhrp_packet_complete(zb, hdr, ifp);
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nhrp_peer_send(peer, zb);
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err:
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nhrp_peer_unref(peer);
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@ -730,7 +730,8 @@ static void nhrp_handle_registration_request(struct nhrp_packet_parser *p)
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}
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}
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nhrp_packet_complete(zb, hdr);
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// auth ext was validated and copied from the request
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nhrp_packet_complete_auth(zb, hdr, ifp, false);
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nhrp_peer_send(p->peer, zb);
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err:
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zbuf_free(zb);
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@ -812,7 +813,7 @@ void nhrp_peer_send_indication(struct interface *ifp, uint16_t protocol_type,
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/* Payload is the packet causing indication */
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zbuf_copy(zb, pkt, zbuf_used(pkt));
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nhrp_packet_complete(zb, hdr);
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nhrp_packet_complete(zb, hdr, ifp);
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nhrp_peer_send(p, zb);
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nhrp_peer_unref(p);
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zbuf_free(zb);
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@ -1063,7 +1064,8 @@ static void nhrp_peer_forward(struct nhrp_peer *p,
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nhrp_ext_complete(zb, dst);
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}
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nhrp_packet_complete(zb, hdr);
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// XXX: auth already handled ???
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nhrp_packet_complete_auth(zb, hdr, pp->ifp, false);
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nhrp_peer_send(p, zb);
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zbuf_free(zb);
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zbuf_free(zb_copy);
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@ -1089,8 +1091,7 @@ static void nhrp_packet_debug(struct zbuf *zb, const char *dir)
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reply = packet_types[hdr->type].type == PACKET_REPLY;
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debugf(NHRP_DEBUG_COMMON, "%s %s(%d) %pSU -> %pSU", dir,
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(packet_types[hdr->type].name ? packet_types[hdr->type].name
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: "Unknown"),
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(packet_types[hdr->type].name ? : "Unknown"),
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hdr->type, reply ? &dst_proto : &src_proto,
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reply ? &src_proto : &dst_proto);
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}
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@ -1106,11 +1107,70 @@ static int proto2afi(uint16_t proto)
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return AF_UNSPEC;
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}
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struct nhrp_route_info {
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int local;
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struct interface *ifp;
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struct nhrp_vc *vc;
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};
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static int nhrp_packet_send_error(struct nhrp_packet_parser *pp,
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uint16_t indication_code, uint16_t offset)
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{
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union sockunion src_proto, dst_proto;
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struct nhrp_packet_header *hdr;
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struct zbuf *zb;
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src_proto = pp->src_proto;
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dst_proto = pp->dst_proto;
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if (packet_types[pp->hdr->type].type != PACKET_REPLY) {
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src_proto = pp->dst_proto;
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dst_proto = pp->src_proto;
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}
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/* Create reply */
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zb = zbuf_alloc(1500); // XXX: hardcode -> calculation routine
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hdr = nhrp_packet_push(zb, NHRP_PACKET_ERROR_INDICATION, &pp->src_nbma,
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&src_proto, &dst_proto);
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hdr->u.error.code = indication_code;
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hdr->u.error.offset = htons(offset);
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hdr->flags = pp->hdr->flags;
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hdr->hop_count = 0; // XXX: cisco returns 255
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/* Payload is the packet causing error */
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/* Don`t add extension according to RFC */
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/* wireshark gives bad checksum, without exts */
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// pp->hdr->checksum = nhrp_packet_calculate_checksum(zbuf_used(&pp->payload))
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zbuf_put(zb, pp->hdr, sizeof(*pp->hdr));
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zbuf_copy(zb, &pp->payload, zbuf_used(&pp->payload));
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nhrp_packet_complete_auth(zb, hdr, pp->ifp, false);
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/* nhrp_packet_debug(zb, "SEND_ERROR"); */
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nhrp_peer_send(pp->peer, zb);
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zbuf_free(zb);
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return 0;
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}
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static bool nhrp_connection_authorized(struct nhrp_packet_parser *pp)
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{
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struct nhrp_cisco_authentication_extension *auth_ext;
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struct nhrp_interface *nifp = pp->ifp->info;
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struct zbuf *auth = nifp->auth_token;
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struct nhrp_extension_header *ext;
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struct zbuf *extensions, pl;
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int cmp = 0;
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extensions = zbuf_alloc(zbuf_used(&pp->extensions));
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zbuf_copy_peek(extensions, &pp->extensions, zbuf_used(&pp->extensions));
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while ((ext = nhrp_ext_pull(extensions, &pl)) != NULL) {
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switch (htons(ext->type) & ~NHRP_EXTENSION_FLAG_COMPULSORY) {
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case NHRP_EXTENSION_AUTHENTICATION:
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cmp = memcmp(auth->buf, pl.buf, zbuf_size(auth));
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auth_ext = (struct nhrp_cisco_authentication_extension *)
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auth->buf;
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debugf(NHRP_DEBUG_COMMON,
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"Processing Authentication Extension for (%s:%s|%d)",
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auth_ext->secret, (const char *)pl.buf, cmp);
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break;
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}
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}
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zbuf_free(extensions);
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return cmp == 0;
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}
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void nhrp_peer_recv(struct nhrp_peer *p, struct zbuf *zb)
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{
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@ -1191,10 +1251,20 @@ void nhrp_peer_recv(struct nhrp_peer *p, struct zbuf *zb)
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goto drop;
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}
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/* RFC2332 5.3.4 - Authentication is always done pairwise on an NHRP
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* hop-by-hop basis; i.e. regenerated at each hop. */
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nhrp_packet_debug(zb, "Recv");
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/* FIXME: Check authentication here. This extension needs to be
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* pre-handled. */
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if (nifp->auth_token &&
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(hdr->type != NHRP_PACKET_ERROR_INDICATION ||
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hdr->u.error.code != NHRP_ERROR_AUTHENTICATION_FAILURE)) {
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if (!nhrp_connection_authorized(&pp)) {
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nhrp_packet_send_error(&pp,
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NHRP_ERROR_AUTHENTICATION_FAILURE,
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0);
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info = "authentication failure";
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goto drop;
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}
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}
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/* Figure out if this is local */
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target_addr = (packet_types[hdr->type].type == PACKET_REPLY)
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@ -425,7 +425,7 @@ static void nhrp_shortcut_send_resolution_req(struct nhrp_shortcut *s)
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"Shortcut res_req: set cie ht to %u and mtu to %u. shortcut ht is %u",
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ntohs(cie->holding_time), ntohs(cie->mtu), s->holding_time);
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nhrp_ext_request(zb, hdr, ifp);
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nhrp_ext_request(zb, hdr);
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/* Cisco NAT detection extension */
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hdr->flags |= htons(NHRP_FLAG_RESOLUTION_NAT);
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@ -438,7 +438,7 @@ static void nhrp_shortcut_send_resolution_req(struct nhrp_shortcut *s)
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nhrp_ext_complete(zb, ext);
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}
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nhrp_packet_complete(zb, hdr);
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nhrp_packet_complete(zb, hdr, ifp);
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nhrp_peer_send(peer, zb);
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nhrp_peer_unref(peer);
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@ -12,6 +12,9 @@
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#include "nhrpd.h"
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#include "netlink.h"
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#include "nhrp_protocol.h"
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#include "nhrpd/nhrp_vty_clippy.c"
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static int nhrp_config_write(struct vty *vty);
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static struct cmd_node zebra_node = {
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@ -459,6 +462,56 @@ DEFUN(if_no_nhrp_holdtime, if_no_nhrp_holdtime_cmd,
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return CMD_SUCCESS;
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}
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#define NHRP_CISCO_PASS_LEN 8
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DEFPY(if_nhrp_authentication, if_nhrp_authentication_cmd,
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AFI_CMD "nhrp authentication PASSWORD$password",
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AFI_STR
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NHRP_STR
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"Specify plaint text password used for authenticantion\n"
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"Password, plain text, limited to 8 characters\n")
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{
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VTY_DECLVAR_CONTEXT(interface, ifp);
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struct nhrp_cisco_authentication_extension *auth;
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struct nhrp_interface *nifp = ifp->info;
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int pass_len = strlen(password);
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if (pass_len > NHRP_CISCO_PASS_LEN) {
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vty_out(vty, "Password size limit exceeded (%d>%d)\n",
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pass_len, NHRP_CISCO_PASS_LEN);
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return CMD_WARNING_CONFIG_FAILED;
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}
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if (nifp->auth_token)
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zbuf_free(nifp->auth_token);
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nifp->auth_token = zbuf_alloc(pass_len + sizeof(uint32_t));
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auth = (struct nhrp_cisco_authentication_extension *)
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nifp->auth_token->buf;
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auth->type = htonl(NHRP_AUTHENTICATION_PLAINTEXT);
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memcpy(auth->secret, password, pass_len);
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// XXX RFC: reset active (non-authorized) connections?
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/* vty_out(vty, "NHRP passwd (%s:%s)", nifp->ifp->name, auth->secret); */
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return CMD_SUCCESS;
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}
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DEFPY(if_no_nhrp_authentication, if_no_nhrp_authentication_cmd,
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"no " AFI_CMD "nhrp authentication PASSWORD$password",
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NO_STR
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AFI_STR
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NHRP_STR
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"Reset password used for authentication\n"
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"Password, plain text\n")
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{
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VTY_DECLVAR_CONTEXT(interface, ifp);
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struct nhrp_interface *nifp = ifp->info;
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if (nifp->auth_token)
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zbuf_free(nifp->auth_token);
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return CMD_SUCCESS;
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}
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DEFUN(if_nhrp_mtu, if_nhrp_mtu_cmd,
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"ip nhrp mtu <(576-1500)|opennhrp>",
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IP_STR
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@ -1053,6 +1106,7 @@ DEFUN(show_dmvpn, show_dmvpn_cmd,
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static void clear_nhrp_cache(struct nhrp_cache *c, void *data)
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{
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struct info_ctx *ctx = data;
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if (c->cur.type <= NHRP_CACHE_DYNAMIC) {
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nhrp_cache_update_binding(c, c->cur.type, -1, NULL, 0, NULL,
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NULL);
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@ -1129,6 +1183,7 @@ static void interface_config_write_nhrp_map(struct nhrp_cache_config *c,
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static int interface_config_write(struct vty *vty)
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{
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struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
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struct nhrp_cisco_authentication_extension *auth;
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struct write_map_ctx mapctx;
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struct interface *ifp;
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struct nhrp_interface *nifp;
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@ -1155,6 +1210,12 @@ static int interface_config_write(struct vty *vty)
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if (nifp->source)
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vty_out(vty, " tunnel source %s\n", nifp->source);
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if (nifp->auth_token) {
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auth = (struct nhrp_cisco_authentication_extension *)
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nifp->auth_token->buf;
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vty_out(vty, " ip nhrp authentication %s\n", auth->secret);
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}
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for (afi = 0; afi < AFI_MAX; afi++) {
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struct nhrp_afi_data *ad = &nifp->afi[afi];
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@ -1256,6 +1317,8 @@ void nhrp_config_init(void)
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install_element(INTERFACE_NODE, &if_no_nhrp_network_id_cmd);
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install_element(INTERFACE_NODE, &if_nhrp_holdtime_cmd);
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install_element(INTERFACE_NODE, &if_no_nhrp_holdtime_cmd);
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install_element(INTERFACE_NODE, &if_nhrp_authentication_cmd);
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install_element(INTERFACE_NODE, &if_no_nhrp_authentication_cmd);
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install_element(INTERFACE_NODE, &if_nhrp_mtu_cmd);
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install_element(INTERFACE_NODE, &if_no_nhrp_mtu_cmd);
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install_element(INTERFACE_NODE, &if_nhrp_flags_cmd);
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@ -311,6 +311,7 @@ DECLARE_DLIST(nhrp_reglist, struct nhrp_registration, reglist_entry);
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struct nhrp_interface {
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struct interface *ifp;
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struct zbuf *auth_token;
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unsigned enabled : 1;
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char *ipsec_profile, *ipsec_fallback_profile, *source;
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@ -480,9 +481,13 @@ struct nhrp_packet_header *nhrp_packet_push(struct zbuf *zb, uint8_t type,
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const union sockunion *src_nbma,
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const union sockunion *src_proto,
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const union sockunion *dst_proto);
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void nhrp_packet_complete(struct zbuf *zb, struct nhrp_packet_header *hdr);
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uint16_t nhrp_packet_calculate_checksum(const uint8_t *pdu, uint16_t len);
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void nhrp_packet_complete(struct zbuf *zb, struct nhrp_packet_header *hdr,
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struct interface *ifp);
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void nhrp_packet_complete_auth(struct zbuf *zb, struct nhrp_packet_header *hdr,
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struct interface *ifp, bool auth);
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struct nhrp_packet_header *nhrp_packet_pull(struct zbuf *zb,
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union sockunion *src_nbma,
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union sockunion *src_proto,
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@ -501,8 +506,7 @@ nhrp_ext_push(struct zbuf *zb, struct nhrp_packet_header *hdr, uint16_t type);
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void nhrp_ext_complete(struct zbuf *zb, struct nhrp_extension_header *ext);
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struct nhrp_extension_header *nhrp_ext_pull(struct zbuf *zb,
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struct zbuf *payload);
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void nhrp_ext_request(struct zbuf *zb, struct nhrp_packet_header *hdr,
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struct interface *);
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void nhrp_ext_request(struct zbuf *zb, struct nhrp_packet_header *hdr);
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int nhrp_ext_reply(struct zbuf *zb, struct nhrp_packet_header *hdr,
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struct interface *ifp, struct nhrp_extension_header *ext,
|
||||
struct zbuf *extpayload);
|
||||
|
|
|
|||
|
|
@ -42,3 +42,7 @@ noinst_HEADERS += \
|
|||
nhrpd/zbuf.h \
|
||||
nhrpd/znl.h \
|
||||
# end
|
||||
|
||||
clippy_scan += \
|
||||
nhrpd/nhrp_vty.c \
|
||||
# end
|
||||
|
|
|
|||
|
|
@ -1,6 +1,7 @@
|
|||
log stdout debugging
|
||||
! debug nhrp all
|
||||
interface r1-gre0
|
||||
ip nhrp authentication secret
|
||||
ip nhrp holdtime 500
|
||||
ip nhrp shortcut
|
||||
ip nhrp network-id 42
|
||||
|
|
|
|||
|
|
@ -2,6 +2,7 @@
|
|||
log stdout debugging
|
||||
nhrp nflog-group 1
|
||||
interface r2-gre0
|
||||
ip nhrp authentication secret
|
||||
ip nhrp holdtime 500
|
||||
ip nhrp redirect
|
||||
ip nhrp network-id 42
|
||||
|
|
|
|||
|
|
@ -214,19 +214,64 @@ def test_protocols_convergence():
|
|||
def test_nhrp_connection():
|
||||
"Assert that the NHRP peers can find themselves."
|
||||
tgen = get_topogen()
|
||||
pingrouter = tgen.gears["r1"]
|
||||
hubrouter = tgen.gears["r2"]
|
||||
if tgen.routers_have_failure():
|
||||
pytest.skip(tgen.errors)
|
||||
|
||||
pingrouter = tgen.gears["r1"]
|
||||
logger.info("Check Ping IPv4 from R1 to R2 = 10.255.255.2)")
|
||||
output = pingrouter.run("ping 10.255.255.2 -f -c 1000")
|
||||
logger.info(output)
|
||||
if "1000 packets transmitted, 1000 received" not in output:
|
||||
def ping_helper():
|
||||
output = pingrouter.run("ping 10.255.255.2 -f -c 100")
|
||||
logger.info(output)
|
||||
return output
|
||||
|
||||
# force session to reinitialize
|
||||
def relink_session():
|
||||
for r in ["r1", "r2"]:
|
||||
tgen.gears[r].vtysh_cmd("clear ip nhrp cache")
|
||||
tgen.net[r].cmd("ip l del {}-gre0".format(r));
|
||||
_populate_iface();
|
||||
|
||||
### Passwords are the same
|
||||
logger.info("Check Ping IPv4 from R1 to R2 = 10.255.255.2")
|
||||
output = ping_helper()
|
||||
if "100 packets transmitted, 100 received" not in output:
|
||||
assertmsg = "expected ping IPv4 from R1 to R2 should be ok"
|
||||
assert 0, assertmsg
|
||||
else:
|
||||
logger.info("Check Ping IPv4 from R1 to R2 OK")
|
||||
|
||||
### Passwords are different
|
||||
logger.info("Modify password and send ping again, should drop")
|
||||
hubrouter.vtysh_cmd("""
|
||||
configure
|
||||
interface r2-gre0
|
||||
ip nhrp authentication secret12
|
||||
""")
|
||||
relink_session()
|
||||
topotest.sleep(10, "Waiting for session to initialize")
|
||||
output = ping_helper()
|
||||
if "Network is unreachable" not in output:
|
||||
assertmsg = "expected ping IPv4 from R1 to R2 - should be down"
|
||||
assert 0, assertmsg
|
||||
else:
|
||||
logger.info("Check Ping IPv4 from R1 to R2 missing - OK")
|
||||
|
||||
### Passwords are the same - again
|
||||
logger.info("Recover password and verify conectivity is back")
|
||||
hubrouter.vtysh_cmd("""
|
||||
configure
|
||||
interface r2-gre0
|
||||
ip nhrp authentication secret
|
||||
""")
|
||||
relink_session()
|
||||
topotest.sleep(10, "Waiting for session to initialize")
|
||||
output = pingrouter.run("ping 10.255.255.2 -f -c 100")
|
||||
logger.info(output)
|
||||
if "100 packets transmitted, 100 received" not in output:
|
||||
assertmsg = "expected ping IPv4 from R1 to R2 should be ok"
|
||||
assert 0, assertmsg
|
||||
else:
|
||||
logger.info("Check Ping IPv4 from R1 to R2 OK")
|
||||
|
||||
def test_route_install():
|
||||
"Test use of NHRP routes by other protocols (sharpd here)."
|
||||
|
|
|
|||
Loading…
Reference in a new issue