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Md5 authentification added (unsested).

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Packet receiving clean up.
This commit is contained in:
Ondrej Filip 2004-06-26 20:15:34 +00:00
parent 5236fb03af
commit 3e2bd0f17a
13 changed files with 261 additions and 127 deletions
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18
proto/ospf/config.Y
View file

@ -24,7 +24,7 @@ CF_DECLS
CF_KEYWORDS(OSPF, AREA, OSPF_METRIC1, OSPF_METRIC2, OSPF_TAG)
CF_KEYWORDS(NEIGHBORS, RFC1583COMPAT, STUB, TICK, COST, RETRANSMIT)
CF_KEYWORDS(HELLO, TRANSMIT, PRIORITY, DEAD, NONBROADCAST, POINTOPOINT, TYPE)
CF_KEYWORDS(NONE, SIMPLE, AUTHENTICATION, PASSWORD, STRICT)
CF_KEYWORDS(NONE, SIMPLE, AUTHENTICATION, STRICT)
CF_KEYWORDS(ELIGIBLE, POLL, NETWORKS, HIDDEN, VIRTUAL, LINK)
%type <t> opttext
@ -96,9 +96,9 @@ ospf_vlink_item:
| TRANSMIT DELAY expr { OSPF_PATT->inftransdelay = $3 ; if (($3<=0) || ($3>65535)) cf_error("Transmit delay must be in range 1-65535"); }
| WAIT expr { OSPF_PATT->waitint = $2 ; }
| DEAD COUNT expr { OSPF_PATT->deadc = $3 ; if ($3<=1) cf_error("Dead count must be greater than one"); }
| AUTHENTICATION NONE { OSPF_PATT->autype = AU_NONE ; }
| AUTHENTICATION SIMPLE { OSPF_PATT->autype = AU_SIMPLE ; }
| PASSWORD TEXT { memcpy(OSPF_PATT->password, $2, 8); }
| AUTHENTICATION NONE { OSPF_PATT->autype = OSPF_AUTH_NONE ; }
| AUTHENTICATION SIMPLE { OSPF_PATT->autype = OSPF_AUTH_SIMPLE ; }
| password_list {OSPF_PATT->passwords = $1; }
;
ospf_vlink_start: VIRTUAL LINK '{'
@ -114,7 +114,7 @@ ospf_vlink_start: VIRTUAL LINK '{'
OSPF_PATT->waitint = WAIT_DMH*HELLOINT_D;
OSPF_PATT->deadc = DEADC_D;
OSPF_PATT->type = OSPF_IT_VLINK;
OSPF_PATT->autype = AU_NONE;
OSPF_PATT->autype = OSPF_AUTH_NONE;
}
;
@ -133,9 +133,9 @@ ospf_iface_item:
| STRICT NONBROADCAST bool { OSPF_PATT->strictnbma = $3 ; }
| STUB bool { OSPF_PATT->stub = $2 ; }
| NEIGHBORS '{' ipa_list '}'
| AUTHENTICATION NONE { OSPF_PATT->autype = AU_NONE ; }
| AUTHENTICATION SIMPLE { OSPF_PATT->autype = AU_SIMPLE ; }
| PASSWORD TEXT { memcpy(OSPF_PATT->password, $2, 8); }
| AUTHENTICATION NONE { OSPF_PATT->autype = OSPF_AUTH_NONE ; }
| AUTHENTICATION SIMPLE { OSPF_PATT->autype = OSPF_AUTH_SIMPLE ; }
| password_list {OSPF_PATT->passwords = $1; }
;
pref_list:
@ -210,7 +210,7 @@ ospf_iface_start:
OSPF_PATT->strictnbma = 0;
OSPF_PATT->stub = 0;
init_list(&OSPF_PATT->nbma_list);
OSPF_PATT->autype = AU_NONE;
OSPF_PATT->autype = OSPF_AUTH_NONE;
}
;

12
proto/ospf/dbdes.c
View file

@ -38,15 +38,14 @@ ospf_dbdes_send(struct ospf_neighbor *n)
n->myimms.bit.i = 1;
pkt = (struct ospf_dbdes_packet *) (ifa->ip_sk->tbuf);
op = (struct ospf_packet *) pkt;
fill_ospf_pkt_hdr(ifa, pkt, DBDES_P);
ospf_pkt_fill_hdr(ifa, pkt, DBDES_P);
pkt->iface_mtu = htons(ifa->iface->mtu);
pkt->options = ifa->options;
pkt->imms = n->myimms;
pkt->ddseq = htonl(n->dds);
length = sizeof(struct ospf_dbdes_packet);
op->length = htons(length);
ospf_pkt_finalize(ifa, op);
ospf_send_to(ifa->ip_sk, length, n->ip);
ospf_send_to(ifa->ip_sk, n->ip, ifa);
OSPF_TRACE(D_PACKETS, "DB_DES (I) sent to %I via %s.", n->ip,
ifa->iface->name);
break;
@ -63,12 +62,12 @@ ospf_dbdes_send(struct ospf_neighbor *n)
pkt = n->ldbdes;
op = (struct ospf_packet *) pkt;
fill_ospf_pkt_hdr(ifa, pkt, DBDES_P);
ospf_pkt_fill_hdr(ifa, pkt, DBDES_P);
pkt->iface_mtu = htons(ifa->iface->mtu);
pkt->options = ifa->options;
pkt->ddseq = htonl(n->dds);
j = i = (ifa->iface->mtu - sizeof(struct ospf_dbdes_packet) - SIPH) / sizeof(struct ospf_lsa_header); /* Number of possible lsaheaders to send */
j = i = (ospf_pkt_maxsize(ifa) - sizeof(struct ospf_dbdes_packet)) / sizeof(struct ospf_lsa_header); /* Number of possible lsaheaders to send */
lsa = (n->ldbdes + sizeof(struct ospf_dbdes_packet));
if (n->myimms.bit.m)
@ -117,7 +116,6 @@ ospf_dbdes_send(struct ospf_neighbor *n)
sizeof(struct ospf_dbdes_packet);
op->length = htons(length);
ospf_pkt_finalize(ifa, op);
DBG("%s: DB_DES (M) prepared for %I.\n", p->name, n->ip);
}
@ -136,7 +134,7 @@ ospf_dbdes_send(struct ospf_neighbor *n)
memcpy(ifa->ip_sk->tbuf, n->ldbdes, length);
/* Copy last sent packet again */
ospf_send_to(ifa->ip_sk, length, n->ip);
ospf_send_to(ifa->ip_sk, n->ip, n->ifa);
if(n->myimms.bit.ms) tm_start(n->rxmt_timer, n->ifa->rxmtint); /* Restart timer */

20
proto/ospf/hello.c
View file

@ -200,7 +200,7 @@ ospf_hello_send(timer * timer, int poll, struct ospf_neighbor *dirn)
/* Now fill ospf_hello header */
op = (struct ospf_packet *) pkt;
fill_ospf_pkt_hdr(ifa, pkt, HELLO_P);
ospf_pkt_fill_hdr(ifa, pkt, HELLO_P);
pkt->netmask = ipa_mkmask(ifa->iface->addr->pxlen);
ipa_hton(pkt->netmask);
@ -218,6 +218,11 @@ ospf_hello_send(timer * timer, int poll, struct ospf_neighbor *dirn)
pp = (u32 *) (((u8 *) pkt) + sizeof(struct ospf_hello_packet));
WALK_LIST(neigh, ifa->neigh_list)
{
if ((i+1) * sizeof(u32) + sizeof(struct ospf_hello_packet) > ospf_pkt_maxsize(ifa))
{
OSPF_TRACE(D_PACKETS, "Too many neighbors on the interface!");
break;
}
*(pp + i) = htonl(neigh->rid);
i++;
}
@ -225,15 +230,12 @@ ospf_hello_send(timer * timer, int poll, struct ospf_neighbor *dirn)
length = sizeof(struct ospf_hello_packet) + i * sizeof(u32);
op->length = htons(length);
ospf_pkt_finalize(ifa, op);
/* And finally send it :-) */
switch(ifa->type)
{
case OSPF_IT_NBMA:
if (timer == NULL) /* Response to received hello */
{
ospf_send_to(ifa->ip_sk, length, dirn->ip);
ospf_send_to(ifa->ip_sk, dirn->ip, ifa);
}
else
{
@ -258,7 +260,7 @@ ospf_hello_send(timer * timer, int poll, struct ospf_neighbor *dirn)
if ((poll == 1) && (send))
{
if (toall || (meeli && nb->eligible))
ospf_send_to(ifa->ip_sk, length, nb->ip);
ospf_send_to(ifa->ip_sk, nb->ip, ifa);
}
}
if (poll == 0)
@ -267,16 +269,16 @@ ospf_hello_send(timer * timer, int poll, struct ospf_neighbor *dirn)
{
if (toall || (n1->rid == ifa->drid) || (n1->rid == ifa->bdrid) ||
(meeli && (n1->priority > 0)))
ospf_send_to(ifa->ip_sk, length, n1->ip);
ospf_send_to(ifa->ip_sk, n1->ip, ifa);
}
}
}
break;
case OSPF_IT_VLINK:
ospf_send_to(ifa->ip_sk, length, ifa->vip);
ospf_send_to(ifa->ip_sk, ifa->vip, ifa);
break;
default:
sk_send(ifa->hello_sk, length);
ospf_send_to(ifa->hello_sk, IPA_NONE, ifa);
}
OSPF_TRACE(D_PACKETS, "Hello sent via %s", ifa->iface->name);
}

2
proto/ospf/iface.c
View file

@ -373,7 +373,7 @@ ospf_iface_new(struct proto_ospf *po, struct iface *iface, struct ospf_area_conf
ifa->deadc = ip->deadc;
ifa->stub = ip->stub;
ifa->autype = ip->autype;
memcpy(ifa->aukey, ip->password, 8);
ifa->passwords = ip->passwords;
ifa->options = 2; /* FIXME what options? */
if (ip->type == OSPF_IT_UNDEF)

22
proto/ospf/lsack.c
View file

@ -52,7 +52,7 @@ ospf_lsack_send(struct ospf_neighbor *n, int queue)
pk = (struct ospf_lsack_packet *) sk->tbuf;
op = (struct ospf_packet *) sk->tbuf;
fill_ospf_pkt_hdr(n->ifa, pk, LSACK_P);
ospf_pkt_fill_hdr(n->ifa, pk, LSACK_P);
h = (struct ospf_lsa_header *) (pk + 1);
while (!EMPTY_LIST(n->ackl[queue]))
@ -65,7 +65,7 @@ ospf_lsack_send(struct ospf_neighbor *n, int queue)
rem_node(NODE no);
mb_free(no);
if ((i * sizeof(struct ospf_lsa_header) +
sizeof(struct ospf_lsack_packet) + SIPH) > n->ifa->iface->mtu)
sizeof(struct ospf_lsack_packet)) > ospf_pkt_maxsize(n->ifa))
{
if (!EMPTY_LIST(n->ackl[queue]))
{
@ -73,24 +73,23 @@ ospf_lsack_send(struct ospf_neighbor *n, int queue)
sizeof(struct ospf_lsack_packet) +
i * sizeof(struct ospf_lsa_header);
op->length = htons(len);
ospf_pkt_finalize(n->ifa, op);
DBG("Sending and continuing! Len=%u\n", len);
if (ifa->type == OSPF_IT_BCAST)
{
if ((ifa->state == OSPF_IS_DR) || (ifa->state == OSPF_IS_BACKUP))
ospf_send_to(sk, len, AllSPFRouters);
ospf_send_to(sk, AllSPFRouters, ifa);
else
ospf_send_to(sk, len, AllDRouters);
ospf_send_to(sk, AllDRouters, ifa);
}
else
{
if ((ifa->state == OSPF_IS_DR) || (ifa->state == OSPF_IS_BACKUP))
ospf_send_to_agt(sk, len, ifa, NEIGHBOR_EXCHANGE);
ospf_send_to_agt(sk, ifa, NEIGHBOR_EXCHANGE);
else
ospf_send_to_bdr(sk, len, ifa);
ospf_send_to_bdr(sk, ifa);
}
fill_ospf_pkt_hdr(n->ifa, pk, LSACK_P);
ospf_pkt_fill_hdr(n->ifa, pk, LSACK_P);
i = 0;
}
}
@ -98,22 +97,21 @@ ospf_lsack_send(struct ospf_neighbor *n, int queue)
len = sizeof(struct ospf_lsack_packet) + i * sizeof(struct ospf_lsa_header);
op->length = htons(len);
ospf_pkt_finalize(n->ifa, op);
DBG("Sending! Len=%u\n", len);
if (ifa->type == OSPF_IT_BCAST)
{
if ((ifa->state == OSPF_IS_DR) || (ifa->state == OSPF_IS_BACKUP))
{
ospf_send_to(sk, len, AllSPFRouters);
ospf_send_to(sk, AllSPFRouters, ifa);
}
else
{
ospf_send_to(sk, len, AllDRouters);
ospf_send_to(sk, AllDRouters, ifa);
}
}
else
{
ospf_send_to_agt(sk, len, ifa, NEIGHBOR_EXCHANGE);
ospf_send_to_agt(sk, ifa, NEIGHBOR_EXCHANGE);
}
}

7
proto/ospf/lsreq.c
View file

@ -23,7 +23,7 @@ ospf_lsreq_send(struct ospf_neighbor *n)
pk = (struct ospf_lsreq_packet *) n->ifa->ip_sk->tbuf;
op = (struct ospf_packet *) n->ifa->ip_sk->tbuf;
fill_ospf_pkt_hdr(n->ifa, pk, LSREQ_P);
ospf_pkt_fill_hdr(n->ifa, pk, LSREQ_P);
sn = SHEAD(n->lsrql);
if (EMPTY_SLIST(n->lsrql))
@ -33,7 +33,7 @@ ospf_lsreq_send(struct ospf_neighbor *n)
return;
}
i = j = (n->ifa->iface->mtu - SIPH - sizeof(struct ospf_lsreq_packet)) /
i = j = (ospf_pkt_maxsize(n->ifa) - sizeof(struct ospf_lsreq_packet)) /
sizeof(struct ospf_lsreq_header);
lsh = (struct ospf_lsreq_header *) (pk + 1);
@ -59,8 +59,7 @@ ospf_lsreq_send(struct ospf_neighbor *n)
sizeof(struct ospf_lsreq_packet) + (j -
i) * sizeof(struct ospf_lsreq_header);
op->length = htons(length);
ospf_pkt_finalize(n->ifa, op);
ospf_send_to(n->ifa->ip_sk, length, n->ip);
ospf_send_to(n->ifa->ip_sk, n->ip, n->ifa);
OSPF_TRACE(D_PACKETS, "LS request sent to: %I", n->rid);
}

31
proto/ospf/lsupd.c
View file

@ -160,7 +160,7 @@ ospf_lsupd_flood(struct ospf_neighbor *n, struct ospf_lsa_header *hn,
pk = (struct ospf_lsupd_packet *) sk->tbuf;
op = (struct ospf_packet *) sk->tbuf;
fill_ospf_pkt_hdr(ifa, pk, LSUPD_P);
ospf_pkt_fill_hdr(ifa, pk, LSUPD_P);
pk->lsano = htonl(1);
lh = (struct ospf_lsa_header *) (pk + 1);
@ -191,23 +191,22 @@ ospf_lsupd_flood(struct ospf_neighbor *n, struct ospf_lsa_header *hn,
lh->age = htons(age);
op->length = htons(len);
ospf_pkt_finalize(ifa, op);
OSPF_TRACE(D_PACKETS, "LS upd flooded via %s", ifa->iface->name);
if (ifa->type == OSPF_IT_NBMA)
{
if ((ifa->state == OSPF_IS_BACKUP) || (ifa->state == OSPF_IS_DR))
ospf_send_to_agt(sk, len, ifa, NEIGHBOR_EXCHANGE);
ospf_send_to_agt(sk, ifa, NEIGHBOR_EXCHANGE);
else
ospf_send_to_bdr(sk, len, ifa);
ospf_send_to_bdr(sk, ifa);
}
else
{
if ((ifa->state == OSPF_IS_BACKUP) || (ifa->state == OSPF_IS_DR) ||
(ifa->type == OSPF_IT_PTP))
ospf_send_to(sk, len, AllSPFRouters);
ospf_send_to(sk, AllSPFRouters, ifa);
else
ospf_send_to(sk, len, AllDRouters);
ospf_send_to(sk, AllDRouters, ifa);
}
}
}
@ -234,8 +233,8 @@ ospf_lsupd_send_list(struct ospf_neighbor *n, list * l)
DBG("LSupd: 1st packet\n");
fill_ospf_pkt_hdr(n->ifa, pk, LSUPD_P);
len = SIPH + sizeof(struct ospf_lsupd_packet);
ospf_pkt_fill_hdr(n->ifa, pk, LSUPD_P);
len = sizeof(struct ospf_lsupd_packet);
lsano = 0;
pktpos = (pk + 1);
@ -247,18 +246,17 @@ ospf_lsupd_send_list(struct ospf_neighbor *n, list * l)
DBG("Sending ID=%I, Type=%u, RT=%I Sn: 0x%x Age: %u\n",
llsh->lsh.id, llsh->lsh.type, llsh->lsh.rt, en->lsa.sn, en->lsa.age);
if (((u32) (len + en->lsa.length)) > n->ifa->iface->mtu)
if (((u32) (len + en->lsa.length)) > ospf_pkt_maxsize(n->ifa))
{
pk->lsano = htonl(lsano);
op->length = htons(len - SIPH);
ospf_pkt_finalize(n->ifa, op);
op->length = htons(len);
ospf_send_to(n->ifa->ip_sk, len - SIPH, n->ip);
ospf_send_to(n->ifa->ip_sk, n->ip, n->ifa);
OSPF_TRACE(D_PACKETS, "LS upd sent to %I (%d LSAs)", n->ip, lsano);
DBG("LSupd: next packet\n");
fill_ospf_pkt_hdr(n->ifa, pk, LSUPD_P);
len = SIPH + sizeof(struct ospf_lsupd_packet);
ospf_pkt_fill_hdr(n->ifa, pk, LSUPD_P);
len = sizeof(struct ospf_lsupd_packet);
lsano = 0;
pktpos = (pk + 1);
}
@ -273,11 +271,10 @@ ospf_lsupd_send_list(struct ospf_neighbor *n, list * l)
if (lsano > 0)
{
pk->lsano = htonl(lsano);
op->length = htons(len - SIPH);
ospf_pkt_finalize(n->ifa, op);
op->length = htons(len);
OSPF_TRACE(D_PACKETS, "LS upd sent to %I (%d LSAs)", n->ip, lsano);
ospf_send_to(n->ifa->ip_sk, len - SIPH, n->ip);
ospf_send_to(n->ifa->ip_sk, n->ip, n->ifa);
}
}

1
proto/ospf/neighbor.c
View file

@ -41,6 +41,7 @@ ospf_neighbor_new(struct ospf_iface *ifa)
n->ifa = ifa;
add_tail(&ifa->neigh_list, NODE n);
n->adj = 0;
n->csn = 0;
n->ldbdes = mb_allocz(pool, ifa->iface->mtu);
n->state = NEIGHBOR_DOWN;

7
proto/ospf/ospf.c
View file

@ -675,12 +675,7 @@ ospf_reconfigure(struct proto *p, struct proto_config *c)
"Changing authentication type on interface %s",
ifa->iface->name);
}
if (strncmp(ip1->password, ip2->password, 8) != 0)
{
memcpy(ifa->aukey, ip2->password, 8);
OSPF_TRACE(D_EVENTS,
"Changing password on interface %s", ifa->iface->name);
}
/* FIXME Add *passwords */
/* RXMT */
if (ip1->rxmtint != ip2->rxmtint)

31
proto/ospf/ospf.h
View file

@ -9,7 +9,6 @@
#ifndef _BIRD_OSPF_H_
#define _BIRD_OSPF_H_
#define SIPH SIZE_OF_IP_HEADER
#define MAXNETS 10
#ifdef LOCAL_DEBUG
#define OSPF_FORCE_DEBUG 1
@ -122,8 +121,9 @@ struct ospf_iface
ip_addr vip; /* IP of peer of virtual link */
struct ospf_area *voa; /* Area wich the vlink goes through */
u16 autype;
u8 aukey[8];
u8 options;
list *passwords;
u32 csn; /* Crypt seq num. that will be sent net */
ip_addr drip; /* Designated router */
u32 drid;
ip_addr bdrip; /* Backup DR */
@ -168,6 +168,20 @@ struct ospf_iface
list nbma_list;
};
struct ospf_md5
{
u16 zero;
u8 keyid;
u8 len;
u32 csn;
};
union ospf_auth
{
u8 password[8];
struct ospf_md5 md5;
};
struct ospf_packet
{
u8 version;
@ -183,7 +197,7 @@ struct ospf_packet
#define BACKBONE 0
u16 checksum;
u16 autype;
u8 authetication[8];
union ospf_auth u;
};
struct ospf_hello_packet
@ -437,6 +451,7 @@ struct ospf_neighbor
#define ACKL_DIRECT 0
#define ACKL_DELAY 1
timer *ackd_timer; /* Delayed ack timer */
u32 csn; /* Last received crypt seq number (for MD5) */
};
/* Definitions for interface state machine */
@ -512,11 +527,11 @@ struct ospf_iface_patt
u32 strictnbma;
u32 stub;
u32 vid;
/* must be in network byte order */
#define AU_NONE htons(0)
#define AU_SIMPLE htons(1)
#define AU_CRYPT htons(2)
u8 password[8];
#define OSPF_AUTH_NONE 0
#define OSPF_AUTH_SIMPLE 1
#define OSPF_AUTH_CRYPT 2
#define OSPF_AUTH_CRYPT_SIZE 16
list *passwords;
list nbma_list;
};

221
proto/ospf/packet.c
View file

@ -1,15 +1,17 @@
/*
* BIRD -- OSPF
*
* (c) 1999 - 2003 Ondrej Filip <feela@network.cz>
* (c) 1999--2004 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "ospf.h"
#include "nest/password.h"
#include "lib/md5.h"
void
fill_ospf_pkt_hdr(struct ospf_iface *ifa, void *buf, u8 h_type)
ospf_pkt_fill_hdr(struct ospf_iface *ifa, void *buf, u8 h_type)
{
struct ospf_packet *pkt;
struct proto *p;
@ -28,45 +30,167 @@ fill_ospf_pkt_hdr(struct ospf_iface *ifa, void *buf, u8 h_type)
pkt->checksum = 0;
}
void
ospf_tx_authenticate(struct ospf_iface *ifa, struct ospf_packet *pkt)
unsigned
ospf_pkt_maxsize(struct ospf_iface *ifa)
{
pkt->autype = htons(ifa->autype);
memcpy(pkt->authetication, ifa->aukey, 8);
return;
}
static int
ospf_rx_authenticate(struct ospf_iface *ifa, struct ospf_packet *pkt)
{
int i;
if (pkt->autype != htons(ifa->autype))
return 0;
if (ifa->autype == AU_NONE)
return 1;
if (ifa->autype == AU_SIMPLE)
{
for (i = 0; i < 8; i++)
{
if (pkt->authetication[i] != ifa->aukey[i])
return 0;
}
return 1;
}
return 0;
return ifa->iface->mtu - SIZE_OF_IP_HEADER -
((ifa->autype == OSPF_AUTH_CRYPT) ? OSPF_AUTH_CRYPT_SIZE : 0);
}
void
ospf_pkt_finalize(struct ospf_iface *ifa, struct ospf_packet *pkt)
{
struct proto_ospf *po = ifa->proto;
struct proto *p = &po->proto;
struct password_item *passwd = password_find (ifa->passwords);
void *tail;
struct MD5Context ctxt;
char password[OSPF_AUTH_CRYPT_SIZE];
ospf_tx_authenticate(ifa, pkt);
pkt->autype = htons(ifa->autype);
/* Count checksum */
pkt->checksum = ipsum_calculate(pkt, sizeof(struct ospf_packet) - 8,
switch(ifa->autype)
{
case OSPF_AUTH_NONE:
case OSPF_AUTH_SIMPLE:
pkt->checksum = ipsum_calculate(pkt, sizeof(struct ospf_packet) - 8,
(pkt + 1),
ntohs(pkt->length) -
sizeof(struct ospf_packet), NULL);
password_cpy(pkt->u.password, passwd->password, 8);
break;
case OSPF_AUTH_CRYPT:
if (!passwd)
{
log( L_ERR "No suitable password found for authentication" );
return;
}
pkt->checksum = 0;
if (!ifa->csn)
ifa->csn = (u32) time(NULL);
pkt->u.md5.keyid = passwd->id;
pkt->u.md5.len = OSPF_AUTH_CRYPT_SIZE;
pkt->u.md5.zero = 0;
pkt->u.md5.csn = htonl(ifa->csn++);
tail = ((void *)pkt) + ntohs(pkt->length);
MD5Init(&ctxt);
MD5Update(&ctxt, (char *) pkt, ntohs(pkt->length));
password_cpy(password, passwd->password, OSPF_AUTH_CRYPT_SIZE);
MD5Update(&ctxt, password, OSPF_AUTH_CRYPT_SIZE);
MD5Final(tail, &ctxt);
break;
default:
bug("Unknown authentication type");
}
}
static int
ospf_pkt_checkauth(struct ospf_neighbor *n, struct ospf_packet *pkt, int size)
{
int i;
struct ospf_iface *ifa = n->ifa;
struct proto_ospf *po = ifa->proto;
struct proto *p = &po->proto;
struct password_item *pass = NULL, *ptmp;
void *tail;
char md5sum[OSPF_AUTH_CRYPT_SIZE];
char password[OSPF_AUTH_CRYPT_SIZE];
struct MD5Context ctxt;
if (pkt->autype != htons(ifa->autype))
{
OSPF_TRACE(D_PACKETS, "OSPF_auth: Method differs (%d)", ntohs(pkt->autype));
return 0;
}
switch(ifa->autype)
{
case OSPF_AUTH_NONE:
return 1;
break;
case OSPF_AUTH_SIMPLE:
pass = password_find (ifa->passwords);
if(!pass)
{
OSPF_TRACE(D_PACKETS, "OSPF_auth: no password found");
return 0;
}
if (memcmp(pkt->u.password,pass, 8))
{
OSPF_TRACE(D_PACKETS, "OSPF_auth: different passwords");
return 0;
}
else
return 1;
break;
case OSPF_AUTH_CRYPT:
if (pkt->u.md5.len != OSPF_AUTH_CRYPT_SIZE)
{
OSPF_TRACE(D_PACKETS, "OSPF_auth: wrong size of md5 digest");
return 0;
}
if (ntohs(pkt->length) + OSPF_AUTH_CRYPT_SIZE != size)
{
OSPF_TRACE(D_PACKETS, "OSPF_auth: size mismatch");
return 0;
}
if (pkt->u.md5.zero)
{
OSPF_TRACE(D_PACKETS, "OSPF_auth: \"zero\" area is non-zero");
return 0;
}
tail = ((void *)pkt) + ntohs(pkt->length);
WALK_LIST(ptmp, *(ifa->passwords))
{
if (pkt->u.md5.keyid != pass->id) continue;
if ((pass->genfrom > now) || (pass->gento < now)) continue;
pass = ptmp;
break;
}
if(!pass)
{
OSPF_TRACE(D_PACKETS, "OSPF_auth: no suitable md5 password found");
return 0;
}
if(n)
{
if(ntohs(pkt->u.md5.csn) <= n->csn)
{
OSPF_TRACE(D_PACKETS, "OSPF_auth: lower sequence number");
return 0;
}
n->csn = ntohs(pkt->u.md5.csn);
}
MD5Init(&ctxt);
MD5Update(&ctxt, (char *) pkt, ntohs(pkt->length));
password_cpy(password, pass->password, OSPF_AUTH_CRYPT_SIZE);
MD5Update(&ctxt, password, OSPF_AUTH_CRYPT_SIZE);
MD5Final(md5sum, &ctxt);
if (!memcmp(md5sum, tail, OSPF_AUTH_CRYPT_SIZE))
{
OSPF_TRACE(D_PACKETS, "OSPF_auth: wrong md5 digest");
return 0;
}
return 1;
break;
default:
OSPF_TRACE(D_PACKETS, "OSPF_auth: unknown auth type");
return 0;
}
}
/**
@ -119,19 +243,13 @@ ospf_rx_hook(sock * sk, int size)
return 1;
}
if (!ipsum_verify(ps, 16, (void *) ps + sizeof(struct ospf_packet),
ntohs(ps->length) - sizeof(struct ospf_packet), NULL))
if ((ifa->autype != OSPF_AUTH_CRYPT) && (!ipsum_verify(ps, 16, (void *) ps + sizeof(struct ospf_packet),
ntohs(ps->length) - sizeof(struct ospf_packet), NULL)))
{
log(L_ERR "%s%I - bad checksum", mesg, sk->faddr);
return 1;
}
if (!ospf_rx_authenticate(ifa, ps))
{
log(L_ERR "%s%I - bad password", mesg, sk->faddr);
return 1;
}
if (ntohl(ps->areaid) != ifa->an)
{
log(L_ERR "%s%I - other area %ld", mesg, sk->faddr, ps->areaid);
@ -164,6 +282,12 @@ ospf_rx_hook(sock * sk, int size)
return 1;
}
if (!ospf_pkt_checkauth(n, ps, size))
{
log(L_ERR "%s%I - authentification failed", mesg, sk->faddr);
return 1;
}
/* Dump packet
pu8=(u8 *)(sk->rbuf+5*4);
for(i=0;i<ntohs(ps->length);i+=4)
@ -226,26 +350,33 @@ ospf_err_hook(sock * sk, int err UNUSED)
}
void
ospf_send_to_agt(sock * sk, u16 len, struct ospf_iface *ifa, u8 state)
ospf_send_to_agt(sock * sk, struct ospf_iface *ifa, u8 state)
{
struct ospf_neighbor *n;
WALK_LIST(NODE n, ifa->neigh_list) if (n->state >= state)
ospf_send_to(sk, len, n->ip);
ospf_send_to(sk, n->ip, ifa);
}
void
ospf_send_to_bdr(sock * sk, u16 len, struct ospf_iface *ifa)
ospf_send_to_bdr(sock * sk, struct ospf_iface *ifa)
{
if (ipa_compare(ifa->drip, ipa_from_u32(0)) != 0)
ospf_send_to(sk, len, ifa->drip);
ospf_send_to(sk, ifa->drip, ifa);
if (ipa_compare(ifa->bdrip, ipa_from_u32(0)) != 0)
ospf_send_to(sk, len, ifa->bdrip);
ospf_send_to(sk, ifa->bdrip, ifa);
}
void
ospf_send_to(sock *sk, u16 len, ip_addr ip)
ospf_send_to(sock *sk, ip_addr ip, struct ospf_iface *ifa)
{
sk_send_to(sk, len, ip, OSPF_PROTO);
struct ospf_packet *pkt = (struct ospf_packet *) sk->tbuf;
int len = ntohs(pkt->length) + (pkt->autype == OSPF_AUTH_CRYPT) ? OSPF_AUTH_CRYPT_SIZE : 0;
ospf_pkt_finalize(ifa, pkt);
if (ipa_equal(ip, IPA_NONE))
sk_send(sk, len);
else
sk_send_to(sk, len, ip, OSPF_PROTO);
}

13
proto/ospf/packet.h
View file

@ -1,7 +1,7 @@
/*
* BIRD -- OSPF
*
* (c) 1999 - 2000 Ondrej Filip <feela@network.cz>
* (c) 1999--2004 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*
@ -10,15 +10,14 @@
#ifndef _BIRD_OSPF_PACKET_H_
#define _BIRD_OSPF_PACKET_H_
void fill_ospf_pkt_hdr(struct ospf_iface *ifa, void *buf, u8 h_type);
void ospf_tx_authenticate(struct ospf_iface *ifa, struct ospf_packet *pkt);
void ospf_pkt_finalize(struct ospf_iface *ifa, struct ospf_packet *pkt);
void ospf_pkt_fill_hdr(struct ospf_iface *ifa, void *buf, u8 h_type);
unsigned ospf_pkt_maxsize(struct ospf_iface *ifa);
int ospf_rx_hook(sock * sk, int size);
void ospf_tx_hook(sock * sk);
void ospf_err_hook(sock * sk, int err);
void ospf_send_to_agt(sock * sk, u16 len, struct ospf_iface *ifa, u8 state);
void ospf_send_to_bdr(sock * sk, u16 len, struct ospf_iface *ifa);
void ospf_send_to(sock *sk, u16 len, ip_addr ip);
void ospf_send_to_agt(sock * sk, struct ospf_iface *ifa, u8 state);
void ospf_send_to_bdr(sock * sk, struct ospf_iface *ifa);
void ospf_send_to(sock *sk, ip_addr ip, struct ospf_iface *ifa);
#endif /* _BIRD_OSPF_PACKET_H_ */

3
proto/ospf/rt.c
View file

@ -483,8 +483,7 @@ ospf_rt_sum(struct ospf_area *oa)
continue;
type = ORT_NET;
}
if (en->lsa.type == LSA_T_SUM_RT)
else
{
ip = ipa_from_u32(en->lsa.id);
mlen = 32;