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https://gitlab.nic.cz/labs/bird.git
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Few fixme's fixed in rip (will not crash any more on request for
sending routing table - hopefully). Next few steps in md5 authentication (not yet complete).
This commit is contained in:
Pavel Machek
parent
f651941402
commit
bce8a34b12
@ -58,6 +58,7 @@ protocol rip MyRIP_test {
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garbagetime 30;
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interface "*";
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export filter testf;
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honour neighbour;
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passwords { password "ahoj" from 0 to 10;
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password "nazdar" from 10 to 20;
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}
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@ -31,7 +31,6 @@ int
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rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, struct rip_packet *packet, int num )
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{
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DBG( "Incoming authentication: " );
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switch (block->authtype) { /* Authentication type */
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case AT_PLAINTEXT:
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DBG( "Plaintext passwd" );
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@ -50,10 +49,13 @@ rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, stru
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struct password_item *head;
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struct rip_md5_tail *tail;
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/* FIXME: check that block->packetlen looks valid */
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tail = (struct rip_md5_tail *) ((char *) packet + (block->packetlen - sizeof(struct rip_block_auth)));
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head = P_CF->passwords;
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while (head) {
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while (head) { /* FIXME: should not we check that password is not expired? */
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/* FIXME: should check serial numbers, somehow */
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if (head->id == block->keyid) {
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struct MD5Context ctxt;
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char md5sum_packet[16];
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@ -81,16 +83,45 @@ rip_incoming_authentication( struct proto *p, struct rip_block_auth *block, stru
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void
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rip_outgoing_authentication( struct proto *p, struct rip_block_auth *block, struct rip_packet *packet, int num )
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{
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struct password_item *passwd = get_best_password( P_CF->passwords, 0 );
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DBG( "Outgoing authentication: " );
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block->authtype = P_CF->authtype;
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switch (P_CF->authtype) {
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case AT_PLAINTEXT:
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if (!P_CF->passwords) {
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log( L_ERR "no passwords set and password authentication requested\n" );
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return;
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}
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password_strncpy( (char *) (&block->packetlen), P_CF->passwords->password, 16);
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if (!passwd) {
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log( L_ERR "no suitable password found for authentication\n" );
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return;
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}
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block->authtype = P_CF->authtype;
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block->mustbeFFFF = 0xffff;
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switch (P_CF->authtype) {
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case AT_PLAINTEXT:
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password_strncpy( (char *) (&block->packetlen), passwd->password, 16);
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return;
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case AT_MD5:
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{
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struct rip_md5_tail *tail;
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struct MD5Context ctxt;
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static int sequence = 0;
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if (num > PACKET_MD5_MAX)
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bug( "we can not add MD5 authentication to this long packet\n" );
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block->keyid = passwd->id;
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block->authlen = 20;
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block->seq = sequence++;
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block->zero0 = 0;
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block->zero1 = 1;
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block->packetlen = 0 /* FIXME */;
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tail = (struct rip_md5_tail *) ((char *) packet + (block->packetlen - sizeof(struct rip_block_auth)));
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tail->mustbeFFFF = 0xffff;
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tail->mustbe0001 = 0x0001;
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password_strncpy( (char *) (&tail->md5), passwd->password, 16 );
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MD5Init(&ctxt);
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MD5Update(&ctxt, (char *) packet, block->packetlen );
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MD5Final((char *) (&tail->md5), &ctxt);
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return;
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}
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}
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}
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@ -24,7 +24,8 @@ CF_DECLS
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CF_KEYWORDS(RIP, INFINITY, METRIC, PORT, PERIOD, GARBAGETIME, PASSWORDS,
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MODE, BROADCAST, QUIET, NOLISTEN, VERSION1,
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AUTHENTICATION, NONE, PLAINTEXT, MD5)
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AUTHENTICATION, NONE, PLAINTEXT, MD5,
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HONOUR, NEVER, NEIGHBOUR, ALWAYS)
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%type <i> rip_mode rip_auth
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@ -47,6 +48,9 @@ RIP_CFG:
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| RIP_CFG GARBAGETIME expr ';' { RIP_CFG->garbage_time = $3; }
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| RIP_CFG AUTHENTICATION rip_auth ';' {RIP_CFG->authtype = $3; }
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| RIP_CFG PASSWORDS '{' password_list '}' {RIP_CFG->passwords = $4; }
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| RIP_CFG HONOUR ALWAYS ';' { RIP_CFG->honour = HO_ALWAYS; }
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| RIP_CFG HONOUR NEIGHBOUR ';' { RIP_CFG->honour = HO_NEIGHBOUR; }
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| RIP_CFG HONOUR NEVER ';' { RIP_CFG->honour = HO_NEVER; }
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| RIP_CFG rip_iface_list ';'
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;
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@ -96,7 +96,7 @@ rip_tx( sock *s )
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ipa_hton( packet->block[i].netmask );
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ipa_hton( packet->block[i].nexthop );
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if (i++ == 25) {
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if (i++ == ((P_CF->authtype == AT_MD5) ? PACKET_MD5_MAX : PACKET_MAX)) {
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FIB_ITERATE_PUT(&c->iter, z);
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goto break_loop;
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}
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@ -263,8 +263,15 @@ rip_process_packet( struct proto *p, struct rip_packet *packet, int num, ip_addr
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switch( packet->heading.command ) {
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case RIPCMD_REQUEST: DBG( "Asked to send my routing table\n" );
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/* FIXME: should have configurable: ignore always, honour to neighbours, honour always. FIXME: use one global socket for these. FIXME: synchronization - if two ask me at same time */
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rip_sendto( p, whotoldme, port, NULL ); /* no broadcast */
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if (P_CF->honour == HO_NEVER) {
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log( L_WARN "They asked me to send routing table, but I was told not to do it\n" );
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return 0;
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}
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if ((P_CF->honour == HO_NEIGHBOUR) && (!neigh_find( p, &whotoldme, 0 ))) {
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log( L_WARN "They asked me to send routing table, but he is not my neighbour\n" );
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return 0;
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}
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rip_sendto( p, whotoldme, port, HEAD(P->interfaces) ); /* no broadcast */
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break;
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case RIPCMD_RESPONSE: DBG( "*** Rtable from %I\n", whotoldme );
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if (port != P_CF->port) {
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@ -281,8 +288,6 @@ rip_process_packet( struct proto *p, struct rip_packet *packet, int num, ip_addr
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return 0;
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}
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/* FIXME: Should check if it is not my own packet */
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for (i=0; i<num; i++) {
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struct rip_block *block = &packet->block[i];
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if (block->family == 0xffff)
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@ -487,7 +492,10 @@ new_iface(struct proto *p, struct iface *new, unsigned long flags, struct iface_
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rif->sock->err_hook = rip_tx_err;
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rif->sock->daddr = IPA_NONE;
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rif->sock->dport = P_CF->port;
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rif->sock->ttl = 1; /* FIXME: care must be taken not to send requested responses from this socket */
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if (new)
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rif->sock->ttl = 1;
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else
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rif->sock->ttl = 30;
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rif->sock->tos = IP_PREC_INTERNET_CONTROL;
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if (flags & IF_BROADCAST)
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@ -504,8 +512,8 @@ new_iface(struct proto *p, struct iface *new, unsigned long flags, struct iface_
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} else
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if (!(rif->patt->mode & IM_NOLISTEN))
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if (sk_open(rif->sock)<0) {
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log( L_WARN "RIP/%s: could not listen on %s", P_NAME, rif->iface ? rif->iface->name : "(dummy)" );
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/* FIXME: Don't try to transmit into this one */
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log( L_ERR "RIP/%s: could not listen on %s", P_NAME, rif->iface ? rif->iface->name : "(dummy)" );
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/* Don't try to transmit into this one? Well, why not? This should not happen, anyway :-) */
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}
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log( L_DEBUG "RIP/%s: listening on %s, port %d, mode %s", P_NAME, rif->iface ? rif->iface->name : "(dummy)", P_CF->port, want_multicast ? "multicast" : "broadcast" );
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@ -8,6 +8,9 @@
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#define EA_RIP_TAG EA_CODE(EAP_RIP, 0)
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#define EA_RIP_METRIC EA_CODE(EAP_RIP, 1)
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#define PACKET_MAX 25
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#define PACKET_MD5_MAX 18 /* FIXME */
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struct rip_connection {
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node n;
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@ -115,6 +118,10 @@ struct rip_proto_config {
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#define AT_NONE 0
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#define AT_PLAINTEXT 2
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#define AT_MD5 3
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int honour;
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#define HO_NEVER 0
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#define HO_NEIGHBOUR 1
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#define HO_ALWAYS 2
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};
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struct rip_proto {
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