024c310b53
Cryptographic authentication in OSPF is defective by design - there might be several packets independently sent to the network (for example HELLO, LSUPD and LSACK) where they might be reordered and that causes crypt. sequence number error. That can be workarounded by not incresing sequence number too often. Now we update it only when last packet was sent before at least one second. This can constitute a risk of replay attacks, but RFC supposes something similar (like time in seconds used as CSN).
289 lines
9 KiB
Plaintext
289 lines
9 KiB
Plaintext
/*
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* BIRD -- OSPF Configuration
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*
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* (c) 1999--2004 Ondrej Filip <feela@network.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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CF_HDR
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#include "proto/ospf/ospf.h"
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CF_DEFINES
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#define OSPF_CFG ((struct ospf_config *) this_proto)
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static struct ospf_area_config *this_area;
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static struct iface_patt *this_ipatt;
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#define OSPF_PATT ((struct ospf_iface_patt *) this_ipatt)
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static struct nbma_node *this_nbma;
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static struct area_net_config *this_pref;
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static void
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finish_iface_config(struct ospf_iface_patt *ip)
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{
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ip->passwords = get_passwords();
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if ((ip->autype == OSPF_AUTH_CRYPT) && (ip->helloint < 5))
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log(L_WARN "Hello or poll interval less that 5 makes cryptographic authenication prone to replay attacks");
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if ((ip->autype == OSPF_AUTH_NONE) && (ip->passwords != NULL))
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log(L_WARN "Password option without authentication option does not make sense");
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}
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CF_DECLS
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CF_KEYWORDS(OSPF, AREA, OSPF_METRIC1, OSPF_METRIC2, OSPF_TAG)
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CF_KEYWORDS(NEIGHBORS, RFC1583COMPAT, STUB, TICK, COST, RETRANSMIT)
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CF_KEYWORDS(HELLO, TRANSMIT, PRIORITY, DEAD, NONBROADCAST, POINTOPOINT, TYPE)
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CF_KEYWORDS(NONE, SIMPLE, AUTHENTICATION, STRICT, CRYPTOGRAPHIC)
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CF_KEYWORDS(ELIGIBLE, POLL, NETWORKS, HIDDEN, VIRTUAL, LINK)
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CF_KEYWORDS(RX, BUFFER, LARGE, NORMAL)
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%type <t> opttext
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CF_GRAMMAR
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CF_ADDTO(proto, ospf_proto '}')
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ospf_proto_start: proto_start OSPF {
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this_proto = proto_config_new(&proto_ospf, sizeof(struct ospf_config));
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this_proto->preference = DEF_PREF_OSPF;
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init_list(&OSPF_CFG->area_list);
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OSPF_CFG->rfc1583 = DEFAULT_RFC1583;
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OSPF_CFG->tick = DEFAULT_OSPFTICK;
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}
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;
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ospf_proto:
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ospf_proto_start proto_name '{'
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| ospf_proto ospf_proto_item ';'
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;
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ospf_proto_item:
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proto_item
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| RFC1583COMPAT bool { OSPF_CFG->rfc1583 = $2; }
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| TICK expr { OSPF_CFG->tick = $2 ; if($2<=0) cf_error("Tick must be greater than zero"); }
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| ospf_area '}'
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;
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ospf_area_start: AREA idval '{' {
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this_area = cfg_allocz(sizeof(struct ospf_area_config));
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add_tail(&OSPF_CFG->area_list, NODE this_area);
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this_area->areaid = $2;
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this_area->stub = 0;
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init_list(&this_area->patt_list);
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init_list(&this_area->vlink_list);
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init_list(&this_area->net_list);
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}
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;
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ospf_area: ospf_area_start ospf_area_opts
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;
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ospf_area_opts:
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/* empty */
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| ospf_area_opts ospf_area_item ';'
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;
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ospf_area_item:
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STUB COST expr { this_area->stub = $3 ; if($3<=0) cf_error("Stub cost must be greater than zero"); }
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| STUB bool {if($2) { if(!this_area->stub) this_area->stub=DEFAULT_STUB_COST;}else{ this_area->stub=0;}}
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| NETWORKS '{' pref_list '}'
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| INTERFACE ospf_iface_list
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| ospf_vlink
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;
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ospf_vlink:
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ospf_vlink_start '{' ospf_vlink_opts '}' { finish_iface_config(OSPF_PATT); }
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| ospf_vlink_start
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;
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ospf_vlink_opts:
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/* empty */
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| ospf_vlink_opts ospf_vlink_item ';'
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;
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ospf_vlink_item:
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| HELLO expr { OSPF_PATT->helloint = $2 ; if (($2<=0) || ($2>65535)) cf_error("Hello interval must be in range 1-65535"); }
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| RETRANSMIT expr { OSPF_PATT->rxmtint = $2 ; if ($2<=0) cf_error("Retransmit int must be greater than zero"); }
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| TRANSMIT DELAY expr { OSPF_PATT->inftransdelay = $3 ; if (($3<=0) || ($3>65535)) cf_error("Transmit delay must be in range 1-65535"); }
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| WAIT expr { OSPF_PATT->waitint = $2 ; }
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| DEAD expr { OSPF_PATT->dead = $2 ; if ($2<=1) cf_error("Dead interval must be greater than one"); }
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| DEAD COUNT expr { OSPF_PATT->deadc = $3 ; if ($3<=1) cf_error("Dead count must be greater than one"); }
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| AUTHENTICATION NONE { OSPF_PATT->autype = OSPF_AUTH_NONE ; }
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| AUTHENTICATION SIMPLE { OSPF_PATT->autype = OSPF_AUTH_SIMPLE ; }
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| AUTHENTICATION CRYPTOGRAPHIC { OSPF_PATT->autype = OSPF_AUTH_CRYPT ; }
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| password_list
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;
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ospf_vlink_start: VIRTUAL LINK idval
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{
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if (this_area->areaid == 0) cf_error("Virtual link cannot be in backbone");
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this_ipatt = cfg_allocz(sizeof(struct ospf_iface_patt));
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add_tail(&this_area->vlink_list, NODE this_ipatt);
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OSPF_PATT->vid = $3;
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OSPF_PATT->cost = COST_D;
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OSPF_PATT->helloint = HELLOINT_D;
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OSPF_PATT->rxmtint = RXMTINT_D;
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OSPF_PATT->inftransdelay = INFTRANSDELAY_D;
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OSPF_PATT->waitint = WAIT_DMH*HELLOINT_D;
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OSPF_PATT->deadc = DEADC_D;
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OSPF_PATT->dead = 0;
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OSPF_PATT->type = OSPF_IT_VLINK;
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init_list(&OSPF_PATT->nbma_list);
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OSPF_PATT->autype = OSPF_AUTH_NONE;
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reset_passwords();
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}
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;
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ospf_iface_item:
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COST expr { OSPF_PATT->cost = $2 ; if (($2<=0) || ($2>65535)) cf_error("Cost must be in range 1-65535"); }
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| HELLO expr { OSPF_PATT->helloint = $2 ; if (($2<=0) || ($2>65535)) cf_error("Hello interval must be in range 1-65535"); }
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| POLL expr { OSPF_PATT->pollint = $2 ; if ($2<=0) cf_error("Poll int must be greater than zero"); }
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| RETRANSMIT expr { OSPF_PATT->rxmtint = $2 ; if ($2<=0) cf_error("Retransmit int must be greater than zero"); }
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| TRANSMIT DELAY expr { OSPF_PATT->inftransdelay = $3 ; if (($3<=0) || ($3>65535)) cf_error("Transmit delay must be in range 1-65535"); }
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| PRIORITY expr { OSPF_PATT->priority = $2 ; if (($2<0) || ($2>255)) cf_error("Priority must be in range 0-255"); }
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| WAIT expr { OSPF_PATT->waitint = $2 ; }
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| DEAD expr { OSPF_PATT->dead = $2 ; if ($2<=1) cf_error("Dead interval must be greater than one"); }
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| DEAD COUNT expr { OSPF_PATT->deadc = $3 ; if ($3<=1) cf_error("Dead count must be greater than one"); }
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| TYPE BROADCAST { OSPF_PATT->type = OSPF_IT_BCAST ; }
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| TYPE NONBROADCAST { OSPF_PATT->type = OSPF_IT_NBMA ; }
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| TYPE POINTOPOINT { OSPF_PATT->type = OSPF_IT_PTP ; }
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| STRICT NONBROADCAST bool { OSPF_PATT->strictnbma = $3 ; }
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| STUB bool { OSPF_PATT->stub = $2 ; }
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| NEIGHBORS '{' ipa_list '}'
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| AUTHENTICATION NONE { OSPF_PATT->autype = OSPF_AUTH_NONE ; }
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| AUTHENTICATION SIMPLE { OSPF_PATT->autype = OSPF_AUTH_SIMPLE ; }
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| AUTHENTICATION CRYPTOGRAPHIC { OSPF_PATT->autype = OSPF_AUTH_CRYPT ; }
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| RX BUFFER LARGE { OSPF_PATT->rxbuf = OSPF_RXBUF_LARGE ; }
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| RX BUFFER NORMAL { OSPF_PATT->rxbuf = OSPF_RXBUF_NORMAL ; }
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| RX BUFFER expr { OSPF_PATT->rxbuf = $3 ; if ($3 < OSPF_RXBUF_MINSIZE) cf_error("Buffer size is too small") ; }
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| password_list
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;
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pref_list:
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/* empty */
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| pref_list pref_item
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;
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pref_item:
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pref_el
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| pref_hid;
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pref_el: prefix ';'
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{
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this_pref = cfg_allocz(sizeof(struct area_net_config));
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add_tail(&this_area->net_list, NODE this_pref);
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this_pref->px.addr = $1.addr;
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this_pref->px.len = $1.len;
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}
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;
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pref_hid: prefix HIDDEN ';'
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{
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this_pref = cfg_allocz(sizeof(struct area_net_config));
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add_tail(&this_area->net_list, NODE this_pref);
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this_pref->px.addr = $1.addr;
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this_pref->px.len = $1.len;
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this_pref->hidden = 1;
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}
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;
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ipa_list:
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/* empty */
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| ipa_list ipa_item
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;
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ipa_item:
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ipa_el
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| ipa_ne;
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ipa_el: IPA ';'
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{
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this_nbma = cfg_allocz(sizeof(struct nbma_node));
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add_tail(&OSPF_PATT->nbma_list, NODE this_nbma);
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this_nbma->ip=$1;
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this_nbma->eligible=0;
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}
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;
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ipa_ne: IPA ELIGIBLE ';'
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{
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this_nbma = cfg_allocz(sizeof(struct nbma_node));
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add_tail(&OSPF_PATT->nbma_list, NODE this_nbma);
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this_nbma->ip=$1;
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this_nbma->eligible=1;
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}
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;
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ospf_iface_start:
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{
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this_ipatt = cfg_allocz(sizeof(struct ospf_iface_patt));
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add_tail(&this_area->patt_list, NODE this_ipatt);
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OSPF_PATT->cost = COST_D;
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OSPF_PATT->helloint = HELLOINT_D;
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OSPF_PATT->pollint = POLLINT_D;
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OSPF_PATT->rxmtint = RXMTINT_D;
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OSPF_PATT->inftransdelay = INFTRANSDELAY_D;
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OSPF_PATT->priority = PRIORITY_D;
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OSPF_PATT->waitint = WAIT_DMH*HELLOINT_D;
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OSPF_PATT->deadc = DEADC_D;
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OSPF_PATT->dead = 0;
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OSPF_PATT->type = OSPF_IT_UNDEF;
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OSPF_PATT->strictnbma = 0;
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OSPF_PATT->stub = 0;
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init_list(&OSPF_PATT->nbma_list);
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OSPF_PATT->autype = OSPF_AUTH_NONE;
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reset_passwords();
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}
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;
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ospf_iface_opts:
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/* empty */
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| ospf_iface_opts ospf_iface_item ';'
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;
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ospf_iface_opt_list:
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/* empty */
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| '{' ospf_iface_opts '}'
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;
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ospf_iface:
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ospf_iface_start iface_patt ospf_iface_opt_list { finish_iface_config(OSPF_PATT); }
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;
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ospf_iface_list:
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ospf_iface
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| ospf_iface_list ',' ospf_iface
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;
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opttext:
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TEXT
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| /* empty */ { $$ = NULL; }
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;
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CF_ADDTO(dynamic_attr, OSPF_METRIC1 { $$ = f_new_dynamic_attr(EAF_TYPE_INT | EAF_TEMP, T_INT, EA_OSPF_METRIC1); })
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CF_ADDTO(dynamic_attr, OSPF_METRIC2 { $$ = f_new_dynamic_attr(EAF_TYPE_INT | EAF_TEMP, T_INT, EA_OSPF_METRIC2); })
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CF_ADDTO(dynamic_attr, OSPF_TAG { $$ = f_new_dynamic_attr(EAF_TYPE_INT | EAF_TEMP, T_INT, EA_OSPF_TAG); })
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CF_CLI(SHOW OSPF, optsym, [<name>], [[Show information about OSPF protocol]])
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{ ospf_sh(proto_get_named($3, &proto_ospf)); };
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CF_CLI(SHOW OSPF NEIGHBORS, optsym opttext, [<name>] [\"<interface>\"], [[Show information about OSPF neighbors]])
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{ ospf_sh_neigh(proto_get_named($4, &proto_ospf), $5); };
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CF_CLI(SHOW OSPF INTERFACE, optsym opttext, [<name>] [\"<interface>\"], [[Show information about interface]])
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{ ospf_sh_iface(proto_get_named($4, &proto_ospf), $5); };
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CF_CLI(SHOW OSPF TOPOLOGY, optsym opttext, [<name>], [[Show information about OSPF network topology]])
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{ ospf_sh_state(proto_get_named($4, &proto_ospf), 0); };
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CF_CLI(SHOW OSPF STATE, optsym opttext, [<name>], [[Show information about OSPF network state]])
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{ ospf_sh_state(proto_get_named($4, &proto_ospf), 1); };
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CF_CODE
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CF_END
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