Serge Bazanski | ec71cb5 | 2019-08-22 18:13:13 +0200 | [diff] [blame] | 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "crypto/x509" |
| 6 | "flag" |
| 7 | "fmt" |
| 8 | "sort" |
| 9 | "strings" |
| 10 | |
| 11 | pb "code.hackerspace.pl/hscloud/bgpwtf/cccampix/proto" |
| 12 | "github.com/golang/glog" |
| 13 | "google.golang.org/grpc" |
| 14 | "google.golang.org/grpc/credentials" |
| 15 | ) |
| 16 | |
| 17 | var ( |
| 18 | flagVerifier string |
| 19 | flagIdentity string |
| 20 | flagRouterID string |
| 21 | flagV6 bool |
| 22 | flagLocalIP string |
Serge Bazanski | ef93747 | 2019-08-29 14:53:18 +0200 | [diff] [blame] | 23 | flagUpstream bool |
Serge Bazanski | ec71cb5 | 2019-08-22 18:13:13 +0200 | [diff] [blame] | 24 | ) |
| 25 | |
| 26 | func init() { |
| 27 | flag.Set("logtostderr", "true") |
| 28 | } |
| 29 | |
| 30 | func main() { |
| 31 | flag.StringVar(&flagVerifier, "verifier", "", "Verifier endpoint") |
| 32 | flag.StringVar(&flagIdentity, "identity", "", "Router identity") |
| 33 | flag.StringVar(&flagRouterID, "router_id", "", "Router ID") |
| 34 | flag.StringVar(&flagLocalIP, "local_ip", "", "Local IP") |
| 35 | flag.BoolVar(&flagV6, "v6", false, "V6") |
Serge Bazanski | ef93747 | 2019-08-29 14:53:18 +0200 | [diff] [blame] | 36 | flag.BoolVar(&flagUpstream, "upstream", false, "Is an upstream router") |
Serge Bazanski | ec71cb5 | 2019-08-22 18:13:13 +0200 | [diff] [blame] | 37 | |
| 38 | flag.Parse() |
| 39 | |
| 40 | if flagVerifier == "" { |
| 41 | glog.Exit("verifier must be set") |
| 42 | } |
| 43 | if flagIdentity == "" { |
| 44 | glog.Exit("identity must be set") |
| 45 | } |
| 46 | if flagRouterID == "" { |
| 47 | glog.Exit("router_id must be set") |
| 48 | } |
| 49 | |
| 50 | cpool, _ := x509.SystemCertPool() |
| 51 | creds := credentials.NewClientTLSFromCert(cpool, "") |
| 52 | conn, err := grpc.Dial(flagVerifier, grpc.WithTransportCredentials(creds)) |
| 53 | if err != nil { |
| 54 | glog.Exitf("Dial: %v", err) |
| 55 | } |
| 56 | |
| 57 | ctx := context.Background() |
| 58 | verifier := pb.NewVerifierClient(conn) |
| 59 | |
| 60 | req := &pb.RouterHeartbeatRequest{ |
| 61 | Name: flagIdentity, |
| 62 | } |
| 63 | |
| 64 | res, err := verifier.RouterHeartbeat(ctx, req) |
| 65 | if err != nil { |
| 66 | glog.Exitf("RouterHeartbeat: %v", err) |
| 67 | } |
| 68 | |
| 69 | var config string |
| 70 | if flagV6 { |
| 71 | config = ` |
| 72 | log syslog all; |
| 73 | |
| 74 | router id %s; |
| 75 | debug protocols { states, interfaces, events }; |
| 76 | |
| 77 | timeformat base iso long; |
| 78 | timeformat log iso long; |
| 79 | timeformat protocol iso long; |
| 80 | timeformat route iso long; |
| 81 | |
Serge Bazanski | ef93747 | 2019-08-29 14:53:18 +0200 | [diff] [blame] | 82 | define ourASN = %d; |
| 83 | define filteredNumber = 65666; |
| 84 | define customerNumber = 65667; |
| 85 | define martian = 1; |
| 86 | define prefixTooLong64 = 2; |
| 87 | define prefixTooLong24 = 3; |
| 88 | define pathBogon = 4; |
| 89 | define pathTooLong = 5; |
| 90 | define pathFirstNotPeer = 6; |
| 91 | define prefixFiltered = 9; |
| 92 | |
Serge Bazanski | ec71cb5 | 2019-08-22 18:13:13 +0200 | [diff] [blame] | 93 | protocol device {} |
| 94 | |
| 95 | function net_martians() { |
| 96 | return net ~ [ fc00::/7+, fec0::/10+, ::/128-, ::/0{0,15}, ::/0{49,128} ]; |
| 97 | } |
| 98 | |
| 99 | function generic_in() { |
Serge Bazanski | ef93747 | 2019-08-29 14:53:18 +0200 | [diff] [blame] | 100 | if net_martians() then { |
| 101 | bgp_large_community.add((ourASN, filteredNumber, martian)); |
| 102 | return false; |
| 103 | } |
| 104 | if bgp_path.len > 64 then { |
| 105 | bgp_large_community.add((ourASN, filteredNumber, pathTooLong)); |
| 106 | return false; |
| 107 | } |
| 108 | if net.len > 64 then { |
| 109 | bgp_large_community.add((ourASN, filteredNumber, prefixTooLong64)); |
| 110 | return false; |
| 111 | } |
Serge Bazanski | ec71cb5 | 2019-08-22 18:13:13 +0200 | [diff] [blame] | 112 | return true; |
| 113 | } |
| 114 | ` |
Serge Bazanski | ef93747 | 2019-08-29 14:53:18 +0200 | [diff] [blame] | 115 | config = fmt.Sprintf(config, flagRouterID, 208521) |
Serge Bazanski | ec71cb5 | 2019-08-22 18:13:13 +0200 | [diff] [blame] | 116 | } else { |
| 117 | config = ` |
| 118 | log syslog all; |
| 119 | |
| 120 | router id %s; |
| 121 | debug protocols { states, interfaces, events }; |
| 122 | |
| 123 | timeformat base iso long; |
| 124 | timeformat log iso long; |
| 125 | timeformat protocol iso long; |
| 126 | timeformat route iso long; |
| 127 | |
Serge Bazanski | ef93747 | 2019-08-29 14:53:18 +0200 | [diff] [blame] | 128 | define ourASN = %d; |
| 129 | define filteredNumber = 65666; |
| 130 | define customerNumber = 65667; |
| 131 | define martian = 1; |
| 132 | define prefixTooLong64 = 2; |
| 133 | define prefixTooLong24 = 3; |
| 134 | define pathBogon = 4; |
| 135 | define pathTooLong = 5; |
| 136 | define pathFirstNotPeer = 6; |
| 137 | define prefixFiltered = 9; |
| 138 | |
Serge Bazanski | ec71cb5 | 2019-08-22 18:13:13 +0200 | [diff] [blame] | 139 | protocol device {} |
| 140 | |
| 141 | function net_martians() { |
| 142 | return net ~ [ 169.254.0.0/16+, 172.16.0.0/12+, 192.168.0.0/16+, 10.0.0.0/8+, |
| 143 | 127.0.0.0/8+, 224.0.0.0/4+, 240.0.0.0/4+, 0.0.0.0/32-, 0.0.0.0/0{25,32}, 0.0.0.0/0{0,7} ]; |
| 144 | } |
| 145 | |
| 146 | function generic_in() { |
Serge Bazanski | ef93747 | 2019-08-29 14:53:18 +0200 | [diff] [blame] | 147 | if net_martians() then { |
| 148 | bgp_large_community.add((ourASN, filteredNumber, martian)); |
| 149 | return false; |
| 150 | } |
| 151 | if bgp_path.len > 64 then { |
| 152 | bgp_large_community.add((ourASN, filteredNumber, pathTooLong)); |
| 153 | return false; |
| 154 | } |
| 155 | if net.len > 24 then { |
| 156 | bgp_large_community.add((ourASN, filteredNumber, prefixTooLong24)); |
| 157 | return false; |
| 158 | } |
Serge Bazanski | ec71cb5 | 2019-08-22 18:13:13 +0200 | [diff] [blame] | 159 | return true; |
| 160 | } |
| 161 | ` |
Serge Bazanski | ef93747 | 2019-08-29 14:53:18 +0200 | [diff] [blame] | 162 | config = fmt.Sprintf(config, flagRouterID, 208521) |
| 163 | } |
| 164 | |
| 165 | if flagUpstream { |
| 166 | config += ` |
| 167 | protocol kernel { |
| 168 | scan time 60; |
| 169 | import none; |
| 170 | export all; |
| 171 | } |
| 172 | |
| 173 | filter UPSTREAM_C3NOC_IN { |
| 174 | if net_martians() then reject; |
| 175 | if bgp_path.len > 64 then reject; |
| 176 | accept; |
| 177 | } |
| 178 | |
| 179 | filter UPSTREAM_C3NOC_OUT { |
| 180 | accept; |
| 181 | } |
| 182 | |
| 183 | ` |
| 184 | if flagV6 { |
| 185 | config += ` |
| 186 | protocol bgp UPSTREAM_C3NOC { |
| 187 | import filter UPSTREAM_C3NOC_IN; |
| 188 | export filter UPSTREAM_C3NOC_OUT; |
| 189 | description "UPSTREAM AS13020"; |
| 190 | |
| 191 | local 2a0d:eb02:4242:4242::7 as 208521; |
| 192 | neighbor 2a0d:eb02:4242:4242::250 as 13020; |
| 193 | } |
| 194 | ` |
| 195 | } else { |
| 196 | config += ` |
| 197 | protocol bgp UPSTREAM_C3NOC { |
| 198 | import filter UPSTREAM_C3NOC_IN; |
| 199 | export filter UPSTREAM_C3NOC_OUT; |
| 200 | |
| 201 | local 185.236.243.7 as 208521; |
| 202 | neighbor 185.236.243.250 as 13020; |
| 203 | } |
| 204 | ` |
| 205 | } |
Serge Bazanski | ec71cb5 | 2019-08-22 18:13:13 +0200 | [diff] [blame] | 206 | } |
| 207 | |
| 208 | sort.Slice(res.AsConfigs, func(i, j int) bool { |
| 209 | return res.AsConfigs[i].Asn < res.AsConfigs[j].Asn |
| 210 | }) |
| 211 | |
| 212 | for _, asc := range res.AsConfigs { |
| 213 | sort.Slice(asc.Routers, func(i, j int) bool { |
| 214 | return asc.Routers[i].Password < asc.Routers[j].Password |
| 215 | }) |
| 216 | for i, router := range asc.Routers { |
| 217 | addr := "" |
| 218 | if flagV6 { |
| 219 | addr = router.Ipv6 |
| 220 | } else { |
| 221 | addr = router.Ipv4 |
| 222 | } |
| 223 | if addr == "" { |
| 224 | continue |
| 225 | } |
| 226 | peerid := fmt.Sprintf("PEER_%d_%d", asc.Asn, i) |
| 227 | prefixes := []string{} |
| 228 | for _, prefix := range asc.Prefixes { |
| 229 | if flagV6 && !strings.Contains(prefix.Prefix, ":") { |
| 230 | continue |
| 231 | } |
| 232 | if !flagV6 && !strings.Contains(prefix.Prefix, ".") { |
| 233 | continue |
| 234 | } |
| 235 | parts := strings.Split(prefix.Prefix, "/") |
| 236 | addr := parts[0] |
| 237 | bits := parts[1] |
| 238 | filter := fmt.Sprintf("%s/%s{%s,%d}", addr, bits, bits, prefix.MaxLength) |
| 239 | if fmt.Sprintf("%d", prefix.MaxLength) == bits { |
| 240 | filter = fmt.Sprintf("%s/%s", addr, bits) |
| 241 | } |
| 242 | prefixes = append(prefixes, filter) |
| 243 | } |
| 244 | if len(prefixes) == 0 { |
| 245 | continue |
| 246 | } |
| 247 | allowed := strings.Join(prefixes, ",") |
| 248 | |
| 249 | part := ` |
| 250 | filter %s_in { |
| 251 | if !generic_in() then reject; |
Serge Bazanski | ef93747 | 2019-08-29 14:53:18 +0200 | [diff] [blame] | 252 | if bgp_path.first != %d then { |
| 253 | bgp_large_community.add((ourASN, filteredNumber, pathFirstNotPeer)); |
| 254 | reject; |
| 255 | } |
| 256 | if bgp_path.last != %d then { |
| 257 | bgp_large_community.add((ourASN, filteredNumber, pathFirstNotPeer)); |
| 258 | reject; |
| 259 | } |
| 260 | if ! (net ~ [ %s ]) then { |
| 261 | bgp_large_community.add((ourASN, filteredNumber, prefixFiltered)); |
| 262 | reject; |
| 263 | } |
| 264 | bgp_large_community.add((ourASN, customerNumber, 2137)); |
| 265 | accept; |
Serge Bazanski | ec71cb5 | 2019-08-22 18:13:13 +0200 | [diff] [blame] | 266 | } |
| 267 | ` |
Serge Bazanski | ef93747 | 2019-08-29 14:53:18 +0200 | [diff] [blame] | 268 | part = fmt.Sprintf(part, peerid, asc.Asn, asc.Asn, allowed) |
Serge Bazanski | ec71cb5 | 2019-08-22 18:13:13 +0200 | [diff] [blame] | 269 | config += part |
| 270 | |
| 271 | part = ` |
| 272 | filter %s_out { |
Serge Bazanski | ef93747 | 2019-08-29 14:53:18 +0200 | [diff] [blame] | 273 | if (ourASN, customerNumber, 2137) ~ bgp_large_community then reject; |
Serge Bazanski | ec71cb5 | 2019-08-22 18:13:13 +0200 | [diff] [blame] | 274 | accept; |
| 275 | } |
| 276 | ` |
| 277 | part = fmt.Sprintf(part, peerid) |
| 278 | config += part |
| 279 | |
| 280 | part = ` |
| 281 | protocol bgp %s { |
| 282 | local %s as 208521; |
Serge Bazanski | ef93747 | 2019-08-29 14:53:18 +0200 | [diff] [blame] | 283 | description "PEER AS%d R%d"; |
Serge Bazanski | ec71cb5 | 2019-08-22 18:13:13 +0200 | [diff] [blame] | 284 | neighbor %s as %d; |
| 285 | import filter %s_in; |
Serge Bazanski | ef93747 | 2019-08-29 14:53:18 +0200 | [diff] [blame] | 286 | import keep filtered on; |
| 287 | export filter %s_out; |
Serge Bazanski | a2960f5 | 2019-08-22 20:13:47 +0200 | [diff] [blame] | 288 | password "%s"; |
Serge Bazanski | ec71cb5 | 2019-08-22 18:13:13 +0200 | [diff] [blame] | 289 | } |
| 290 | ` |
Serge Bazanski | ef93747 | 2019-08-29 14:53:18 +0200 | [diff] [blame] | 291 | part = fmt.Sprintf(part, peerid, flagLocalIP, asc.Asn, i, addr, asc.Asn, peerid, peerid, router.Password) |
Serge Bazanski | ec71cb5 | 2019-08-22 18:13:13 +0200 | [diff] [blame] | 292 | config += part |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | fmt.Println(config) |
| 297 | } |