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-rw-r--r--proto/ospf/config.Y14
-rw-r--r--proto/ospf/hello.c7
-rw-r--r--proto/ospf/iface.c28
-rw-r--r--proto/ospf/lsalib.c2
-rw-r--r--proto/ospf/lsupd.c8
-rw-r--r--proto/ospf/ospf.h23
-rw-r--r--proto/ospf/packet.c115
-rw-r--r--proto/ospf/rt.c4
-rw-r--r--proto/ospf/topology.c5
9 files changed, 116 insertions, 90 deletions
diff --git a/proto/ospf/config.Y b/proto/ospf/config.Y
index 297774b5..72928875 100644
--- a/proto/ospf/config.Y
+++ b/proto/ospf/config.Y
@@ -42,6 +42,20 @@ ospf_iface_finish(void)
if ((ip->autype == OSPF_AUTH_NONE) && (ip->passwords != NULL))
log(L_WARN "Password option without authentication option does not make sense");
+
+ if (ip->passwords)
+ {
+ struct password_item *pass;
+ WALK_LIST(pass, *ip->passwords)
+ {
+ if (pass->alg && (ip->autype != OSPF_AUTH_CRYPT))
+ cf_error("Password algorithm option requires cryptographic authentication");
+
+ /* Set default OSPF crypto algorithms */
+ if (!pass->alg && (ip->autype == OSPF_AUTH_CRYPT))
+ pass->alg = ospf_cfg_is_v2() ? ALG_MD5 : ALG_HMAC_SHA256;
+ }
+ }
}
static void
diff --git a/proto/ospf/hello.c b/proto/ospf/hello.c
index 3fbb6167..2c55155d 100644
--- a/proto/ospf/hello.c
+++ b/proto/ospf/hello.c
@@ -105,7 +105,7 @@ ospf_send_hello(struct ospf_iface *ifa, int kind, struct ospf_neighbor *dirn)
}
i = 0;
- max = (ospf_pkt_maxsize(p, ifa) - length) / sizeof(u32);
+ max = (ospf_pkt_maxsize(ifa) - length) / sizeof(u32);
/* Fill all neighbors */
if (kind != OHS_SHUTDOWN)
@@ -222,9 +222,12 @@ ospf_receive_hello(struct ospf_packet *pkt, struct ospf_iface *ifa,
rcv_priority = ps->priority;
int pxlen = u32_masklen(ntohl(ps->netmask));
+ if (pxlen < 0)
+ DROP("prefix garbled", ntohl(ps->netmask));
+
if ((ifa->type != OSPF_IT_VLINK) &&
(ifa->type != OSPF_IT_PTP) &&
- (pxlen != ifa->addr->prefix.pxlen))
+ ((uint) pxlen != ifa->addr->prefix.pxlen))
DROP("prefix length mismatch", pxlen);
neighbors = ps->neighbors;
diff --git a/proto/ospf/iface.c b/proto/ospf/iface.c
index 6ef24ffe..675cf76d 100644
--- a/proto/ospf/iface.c
+++ b/proto/ospf/iface.c
@@ -9,6 +9,7 @@
*/
#include "ospf.h"
+#include "nest/password.h"
const char *ospf_is_names[] = {
@@ -52,6 +53,20 @@ ifa_tx_length(struct ospf_iface *ifa)
}
static inline uint
+ifa_tx_hdrlen(struct ospf_iface *ifa)
+{
+ struct ospf_proto *p = ifa->oa->po;
+
+ uint hlen = ospf_is_v2(p) ? IP4_HEADER_LENGTH : IP6_HEADER_LENGTH;
+
+ /* Relevant just for OSPFv2 */
+ if (ifa->autype == OSPF_AUTH_CRYPT)
+ hlen += max_mac_length(ifa->passwords);
+
+ return hlen;
+}
+
+static inline uint
ifa_bufsize(struct ospf_iface *ifa)
{
uint bsize = ifa->cf->rx_buffer ?: ifa->iface->mtu;
@@ -67,13 +82,7 @@ ifa_flood_queue_size(struct ospf_iface *ifa)
int
ospf_iface_assure_bufsize(struct ospf_iface *ifa, uint plen)
{
- struct ospf_proto *p = ifa->oa->po;
-
- plen += ospf_is_v2(p) ? IP4_HEADER_LENGTH : IP6_HEADER_LENGTH;
-
- /* This is relevant just for OSPFv2 */
- if (ifa->autype == OSPF_AUTH_CRYPT)
- plen += OSPF_AUTH_CRYPT_SIZE;
+ plen += ifa->tx_hdrlen;
if (plen <= ifa->sk->tbsize)
return 0;
@@ -569,6 +578,7 @@ ospf_iface_new(struct ospf_area *oa, struct ifa *addr, struct ospf_iface_patt *i
ifa->stub = ospf_iface_stubby(ip, addr);
ifa->ioprob = OSPF_I_OK;
ifa->tx_length = ifa_tx_length(ifa);
+ ifa->tx_hdrlen = ifa_tx_hdrlen(ifa);
ifa->check_link = ip->check_link;
ifa->ecmp_weight = ip->ecmp_weight;
ifa->check_ttl = (ip->ttl_security == 1);
@@ -680,6 +690,7 @@ ospf_iface_new_vlink(struct ospf_proto *p, struct ospf_iface_patt *ip)
ifa->deadint = ip->deadint;
ifa->inftransdelay = ip->inftransdelay;
ifa->tx_length = ospf_is_v2(p) ? IP4_MIN_MTU : IP6_MIN_MTU;
+ ifa->tx_hdrlen = ifa_tx_hdrlen(ifa);
ifa->autype = ip->autype;
ifa->passwords = ip->passwords;
ifa->instance_id = ip->instance_id;
@@ -820,6 +831,9 @@ ospf_iface_reconfigure(struct ospf_iface *ifa, struct ospf_iface_patt *new)
/* Update passwords */
ifa->passwords = new->passwords;
+ /* Update header length */
+ ifa->tx_hdrlen = ifa_tx_hdrlen(ifa);
+
/* Remaining options are just for proper interfaces */
if (ifa->type == OSPF_IT_VLINK)
return 1;
diff --git a/proto/ospf/lsalib.c b/proto/ospf/lsalib.c
index b4d2faba..b88a114d 100644
--- a/proto/ospf/lsalib.c
+++ b/proto/ospf/lsalib.c
@@ -461,7 +461,7 @@ lsa_validate_sum3_net(struct ospf_lsa_header *lsa, struct ospf_lsa_sum3_net *bod
}
static int
-lsa_validate_sum3_rt(struct ospf_lsa_header *lsa, struct ospf_lsa_sum3_rt *body)
+lsa_validate_sum3_rt(struct ospf_lsa_header *lsa, struct ospf_lsa_sum3_rt *body UNUSED)
{
if (lsa->length != (HDRLEN + sizeof(struct ospf_lsa_sum3_rt)))
return 0;
diff --git a/proto/ospf/lsupd.c b/proto/ospf/lsupd.c
index 65ad8e3d..157d9628 100644
--- a/proto/ospf/lsupd.c
+++ b/proto/ospf/lsupd.c
@@ -105,7 +105,7 @@ invalid:
static inline void
-ospf_lsa_lsrq_down(struct top_hash_entry *req, struct ospf_neighbor *n, struct ospf_neighbor *from)
+ospf_lsa_lsrq_down(struct top_hash_entry *req, struct ospf_neighbor *n)
{
if (req == n->lsrqi)
n->lsrqi = SNODE_NEXT(req);
@@ -188,7 +188,7 @@ ospf_enqueue_lsa(struct ospf_proto *p, struct top_hash_entry *en, struct ospf_if
{
/* If we already have full queue, we send some packets */
uint sent = ospf_flood_lsupd(p, ifa->flood_queue, ifa->flood_queue_used, ifa->flood_queue_used / 2, ifa);
- int i;
+ uint i;
for (i = 0; i < sent; i++)
ifa->flood_queue[i]->ret_count--;
@@ -275,7 +275,7 @@ ospf_flood_lsa(struct ospf_proto *p, struct top_hash_entry *en, struct ospf_neig
/* If same or newer, remove LSA from the link state request list */
if (cmp > CMP_OLDER)
- ospf_lsa_lsrq_down(req, n, from);
+ ospf_lsa_lsrq_down(req, n);
/* If older or same, skip processing of this neighbor */
if (cmp < CMP_NEWER)
@@ -330,7 +330,7 @@ ospf_prepare_lsupd(struct ospf_proto *p, struct ospf_iface *ifa,
pkt = ospf_tx_buffer(ifa);
hlen = ospf_lsupd_hdrlen(p);
- maxsize = ospf_pkt_maxsize(p, ifa);
+ maxsize = ospf_pkt_maxsize(ifa);
ospf_pkt_fill_hdr(ifa, pkt, LSUPD_P);
pos = hlen;
diff --git a/proto/ospf/ospf.h b/proto/ospf/ospf.h
index 4f445f07..e3eae2b5 100644
--- a/proto/ospf/ospf.h
+++ b/proto/ospf/ospf.h
@@ -171,11 +171,7 @@ struct ospf_iface_patt
#define OSPF_RXBUF_MINSIZE 256 /* Minimal allowed size */
u8 instance_id;
- u8 autype; /* Not really used in OSPFv3 */
-#define OSPF_AUTH_NONE 0
-#define OSPF_AUTH_SIMPLE 1
-#define OSPF_AUTH_CRYPT 2
-#define OSPF_AUTH_CRYPT_SIZE 16
+ u8 autype; /* OSPF_AUTH_*, not really used in OSPFv3 */
u8 strictnbma;
u8 check_link;
u8 ecmp_weight;
@@ -325,6 +321,7 @@ struct ospf_iface
u8 marked; /* Used in OSPF reconfigure, 2 for force restart */
u16 rxbuf; /* Buffer size */
u16 tx_length; /* Soft TX packet length limit, usually MTU */
+ u16 tx_hdrlen; /* Expected packet header length, less than tx_length */
u8 check_link; /* Whether iface link change is used */
u8 ecmp_weight; /* Weight used for ECMP */
u8 link_lsa_suppression; /* Suppression of Link-LSA origination */
@@ -415,6 +412,11 @@ struct ospf_neighbor
#define ISM_UNLOOP 5 /* Link up */
#define ISM_DOWN 6 /* Interface down */
+/* OSPF authentication types */
+#define OSPF_AUTH_NONE 0
+#define OSPF_AUTH_SIMPLE 1
+#define OSPF_AUTH_CRYPT 2
+
/* OSPF neighbor states */
#define NEIGHBOR_DOWN 0
@@ -446,7 +448,6 @@ struct ospf_neighbor
#define TRANS_WAIT 2 /* Waiting before the end of translation */
-
/* Generic option flags */
#define OPT_V6 0x01 /* OSPFv3, LSA relevant for IPv6 routing calculation */
#define OPT_E 0x02 /* Related to AS-external LSAs */
@@ -482,7 +483,7 @@ struct ospf_packet
u8 autype; /* Undefined for OSPFv3 */
};
-struct ospf_md5
+struct ospf_auth_crypto
{
u16 zero;
u8 keyid;
@@ -493,7 +494,7 @@ struct ospf_md5
union ospf_auth
{
u8 password[8];
- struct ospf_md5 md5;
+ struct ospf_auth_crypto c32;
};
/* Packet types */
@@ -890,8 +891,7 @@ void ospf_sh_neigh_info(struct ospf_neighbor *n);
/* packet.c */
void ospf_pkt_fill_hdr(struct ospf_iface *ifa, void *buf, u8 h_type);
-uint ospf_pkt_maxsize(struct ospf_proto *p, struct ospf_iface *ifa);
-int ospf_rx_hook(sock * sk, int size);
+int ospf_rx_hook(sock * sk, uint size);
// void ospf_tx_hook(sock * sk);
void ospf_err_hook(sock * sk, int err);
void ospf_verr_hook(sock *sk, int err);
@@ -899,6 +899,9 @@ void ospf_send_to(struct ospf_iface *ifa, ip_addr ip);
void ospf_send_to_agt(struct ospf_iface *ifa, u8 state);
void ospf_send_to_bdr(struct ospf_iface *ifa);
+static inline uint ospf_pkt_maxsize(struct ospf_iface *ifa)
+{ return ifa->tx_length - ifa->tx_hdrlen; }
+
static inline void ospf_send_to_all(struct ospf_iface *ifa)
{ ospf_send_to(ifa, ifa->all_routers); }
diff --git a/proto/ospf/packet.c b/proto/ospf/packet.c
index 7ce6d99f..b84780d3 100644
--- a/proto/ospf/packet.c
+++ b/proto/ospf/packet.c
@@ -11,6 +11,7 @@
#include "ospf.h"
#include "nest/password.h"
#include "lib/md5.h"
+#include "lib/mac.h"
#include "lib/socket.h"
void
@@ -23,7 +24,7 @@ ospf_pkt_fill_hdr(struct ospf_iface *ifa, void *buf, u8 h_type)
pkt->version = ospf_get_version(p);
pkt->type = h_type;
- pkt->length = htons(ospf_pkt_maxsize(p, ifa));
+ pkt->length = htons(ospf_pkt_maxsize(ifa));
pkt->routerid = htonl(p->router_id);
pkt->areaid = htonl(ifa->oa->areaid);
pkt->checksum = 0;
@@ -31,25 +32,12 @@ ospf_pkt_fill_hdr(struct ospf_iface *ifa, void *buf, u8 h_type)
pkt->autype = ifa->autype;
}
-uint
-ospf_pkt_maxsize(struct ospf_proto *p, struct ospf_iface *ifa)
-{
- uint headers = ospf_is_v2(p) ? IP4_HEADER_LENGTH : IP6_HEADER_LENGTH;
-
- /* Relevant just for OSPFv2 */
- if (ifa->autype == OSPF_AUTH_CRYPT)
- headers += OSPF_AUTH_CRYPT_SIZE;
-
- return ifa->tx_length - headers;
-}
-
/* We assume OSPFv2 in ospf_pkt_finalize() */
static void
-ospf_pkt_finalize(struct ospf_iface *ifa, struct ospf_packet *pkt)
+ospf_pkt_finalize(struct ospf_iface *ifa, struct ospf_packet *pkt, uint *plen)
{
- struct password_item *passwd = NULL;
+ struct password_item *pass = NULL;
union ospf_auth *auth = (void *) (pkt + 1);
- uint plen = ntohs(pkt->length);
pkt->checksum = 0;
pkt->autype = ifa->autype;
@@ -61,25 +49,25 @@ ospf_pkt_finalize(struct ospf_iface *ifa, struct ospf_packet *pkt)
switch (ifa->autype)
{
case OSPF_AUTH_SIMPLE:
- passwd = password_find(ifa->passwords, 1);
- if (!passwd)
+ pass = password_find(ifa->passwords, 1);
+ if (!pass)
{
log(L_ERR "No suitable password found for authentication");
return;
}
- strncpy(auth->password, passwd->password, sizeof(auth->password));
+ strncpy(auth->password, pass->password, sizeof(auth->password));
case OSPF_AUTH_NONE:
{
void *body = (void *) (auth + 1);
- uint blen = plen - sizeof(struct ospf_packet) - sizeof(union ospf_auth);
+ uint blen = *plen - sizeof(struct ospf_packet) - sizeof(union ospf_auth);
pkt->checksum = ipsum_calculate(pkt, sizeof(struct ospf_packet), body, blen, NULL);
}
break;
case OSPF_AUTH_CRYPT:
- passwd = password_find(ifa->passwords, 0);
- if (!passwd)
+ pass = password_find(ifa->passwords, 0);
+ if (!pass)
{
log(L_ERR "No suitable password found for authentication");
return;
@@ -100,20 +88,25 @@ ospf_pkt_finalize(struct ospf_iface *ifa, struct ospf_packet *pkt)
ifa->csn_use = now;
- auth->md5.zero = 0;
- auth->md5.keyid = passwd->id;
- auth->md5.len = OSPF_AUTH_CRYPT_SIZE;
- auth->md5.csn = htonl(ifa->csn);
+ uint auth_len = mac_type_length(pass->alg);
+ byte *auth_tail = ((byte *) pkt + *plen);
+ *plen += auth_len;
+
+ ASSERT(*plen < ifa->sk->tbsize);
- void *tail = ((void *) pkt) + plen;
- char password[OSPF_AUTH_CRYPT_SIZE];
- strncpy(password, passwd->password, sizeof(password));
+ auth->c32.zero = 0;
+ auth->c32.keyid = pass->id;
+ auth->c32.len = auth_len;
+ auth->c32.csn = htonl(ifa->csn);
- struct md5_context ctx;
- md5_init(&ctx);
- md5_update(&ctx, (char *) pkt, plen);
- md5_update(&ctx, password, OSPF_AUTH_CRYPT_SIZE);
- memcpy((byte *) tail, md5_final(&ctx), MD5_SIZE);
+ /* Append key for keyed hash, append padding for HMAC (RFC 5709 3.3) */
+ if (pass->alg < ALG_HMAC)
+ strncpy(auth_tail, pass->password, auth_len);
+ else
+ memset32(auth_tail, HMAC_MAGIC, auth_len / 4);
+
+ mac_fill(pass->alg, pass->password, pass->length,
+ (byte *) pkt, *plen, auth_tail);
break;
default:
@@ -124,7 +117,7 @@ ospf_pkt_finalize(struct ospf_iface *ifa, struct ospf_packet *pkt)
/* We assume OSPFv2 in ospf_pkt_checkauth() */
static int
-ospf_pkt_checkauth(struct ospf_neighbor *n, struct ospf_iface *ifa, struct ospf_packet *pkt, int len)
+ospf_pkt_checkauth(struct ospf_neighbor *n, struct ospf_iface *ifa, struct ospf_packet *pkt, uint len)
{
struct ospf_proto *p = ifa->oa->po;
union ospf_auth *auth = (void *) (pkt + 1);
@@ -154,13 +147,19 @@ ospf_pkt_checkauth(struct ospf_neighbor *n, struct ospf_iface *ifa, struct ospf_
return 1;
case OSPF_AUTH_CRYPT:
- if (auth->md5.len != OSPF_AUTH_CRYPT_SIZE)
- DROP("invalid MD5 digest length", auth->md5.len);
+ pass = password_find_by_id(ifa->passwords, auth->c32.keyid);
+ if (!pass)
+ DROP("no suitable password found", auth->c32.keyid);
+
+ uint auth_len = mac_type_length(pass->alg);
- if (plen + OSPF_AUTH_CRYPT_SIZE > len)
- DROP("length mismatch", len);
+ if (plen + auth->c32.len > len)
+ DROP("packet length mismatch", len);
- u32 rcv_csn = ntohl(auth->md5.csn);
+ if (auth->c32.len != auth_len)
+ DROP("wrong authentication length", auth->c32.len);
+
+ u32 rcv_csn = ntohl(auth->c32.csn);
if (n && (rcv_csn < n->csn))
// DROP("lower sequence number", rcv_csn);
{
@@ -171,22 +170,19 @@ ospf_pkt_checkauth(struct ospf_neighbor *n, struct ospf_iface *ifa, struct ospf_
return 0;
}
- pass = password_find_by_id(ifa->passwords, auth->md5.keyid);
- if (!pass)
- DROP("no suitable password found", auth->md5.keyid);
-
- byte *tail = ((byte *) pkt) + plen;
- char received[OSPF_AUTH_CRYPT_SIZE];
- memcpy(received, tail, OSPF_AUTH_CRYPT_SIZE);
- strncpy(tail, pass->password, OSPF_AUTH_CRYPT_SIZE);
+ byte *auth_tail = ((byte *) pkt) + plen;
+ byte *auth_data = alloca(auth_len);
+ memcpy(auth_data, auth_tail, auth_len);
- struct md5_context ctx;
- md5_init(&ctx);
- md5_update(&ctx, (byte *) pkt, plen + OSPF_AUTH_CRYPT_SIZE);
- char *computed = md5_final(&ctx);
+ /* Append key for keyed hash, append padding for HMAC (RFC 5709 3.3) */
+ if (pass->alg < ALG_HMAC)
+ strncpy(auth_tail, pass->password, auth_len);
+ else
+ memset32(auth_tail, HMAC_MAGIC, auth_len / 4);
- if (memcmp(received, computed, OSPF_AUTH_CRYPT_SIZE))
- DROP("wrong MD5 digest", pass->id);
+ if (!mac_verify(pass->alg, pass->password, pass->length,
+ (byte *) pkt, plen + auth_len, auth_data))
+ DROP("wrong authentication code", pass->id);
if (n)
n->csn = rcv_csn;
@@ -214,7 +210,7 @@ drop:
* non generic functions.
*/
int
-ospf_rx_hook(sock *sk, int len)
+ospf_rx_hook(sock *sk, uint len)
{
/* We want just packets from sk->iface. Unfortunately, on BSD we cannot filter
out other packets at kernel level and we receive all packets on all sockets */
@@ -472,15 +468,10 @@ ospf_send_to(struct ospf_iface *ifa, ip_addr dst)
{
sock *sk = ifa->sk;
struct ospf_packet *pkt = (struct ospf_packet *) sk->tbuf;
- int plen = ntohs(pkt->length);
+ uint plen = ntohs(pkt->length);
if (ospf_is_v2(ifa->oa->po))
- {
- if (ifa->autype == OSPF_AUTH_CRYPT)
- plen += OSPF_AUTH_CRYPT_SIZE;
-
- ospf_pkt_finalize(ifa, pkt);
- }
+ ospf_pkt_finalize(ifa, pkt, &plen);
int done = sk_send_to(sk, plen, dst, 0);
if (!done)
diff --git a/proto/ospf/rt.c b/proto/ospf/rt.c
index 5538f4c8..c5c54783 100644
--- a/proto/ospf/rt.c
+++ b/proto/ospf/rt.c
@@ -671,7 +671,7 @@ link_back(struct ospf_area *oa, struct top_hash_entry *en, struct top_hash_entry
which may be later used as the next hop. */
/* In OSPFv2, en->lb is set here. In OSPFv3, en->lb is just cleared here,
- it is set in process_prefixes() to any global addres in the area */
+ it is set in process_prefixes() to any global address in the area */
en->lb = IPA_NONE;
en->lb_id = 0;
@@ -923,7 +923,7 @@ ospf_rt_sum_tr(struct ospf_area *oa)
}
}
-/* Decide about originating or flushing summary LSAs for condended area networks */
+/* Decide about originating or flushing summary LSAs for condensed area networks */
static int
decide_anet_lsa(struct ospf_area *oa, struct area_net *anet, struct ospf_area *anet_oa)
{
diff --git a/proto/ospf/topology.c b/proto/ospf/topology.c
index 86e39d75..aaaf2e8e 100644
--- a/proto/ospf/topology.c
+++ b/proto/ospf/topology.c
@@ -513,6 +513,7 @@ ospf_update_lsadb(struct ospf_proto *p)
}
}
+
static u32
ort_to_lsaid(struct ospf_proto *p, ort *nf)
{
@@ -610,7 +611,7 @@ lsab_offset(struct ospf_proto *p, uint offset)
return ((byte *) p->lsab) + offset;
}
-static inline void *
+static inline void * UNUSED
lsab_end(struct ospf_proto *p)
{
return ((byte *) p->lsab) + p->lsab_used;
@@ -1558,7 +1559,7 @@ static void
add_link_lsa(struct ospf_proto *p, struct ospf_lsa_link *ll, int offset, int *pxc)
{
u32 *pxb = ll->rest;
- int j;
+ uint j;
for (j = 0; j < ll->pxcount; pxb = prefix_advance(pxb), j++)
{
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 21:36:21 +0000