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gen.go
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gen.go
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// Copyright 2018 ETH Zurich
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package trc
import (
"fmt"
"os"
"path/filepath"
"time"
"golang.org/x/crypto/ed25519"
"github.com/scionproto/scion/go/lib/addr"
"github.com/scionproto/scion/go/lib/common"
"github.com/scionproto/scion/go/lib/keyconf"
"github.com/scionproto/scion/go/lib/scrypto"
"github.com/scionproto/scion/go/lib/scrypto/trc"
"github.com/scionproto/scion/go/lib/util"
"github.com/scionproto/scion/go/tools/scion-pki/internal/conf"
"github.com/scionproto/scion/go/tools/scion-pki/internal/pkicmn"
)
func runGenTrc(args []string) {
asMap, err := pkicmn.ProcessSelector(args[0])
if err != nil {
pkicmn.ErrorAndExit("Error: %s\n", err)
}
for isd := range asMap {
if err = genTrc(isd); err != nil {
pkicmn.ErrorAndExit("Error generating TRC: %s\n", err)
}
}
os.Exit(0)
}
func genTrc(isd addr.ISD) error {
confDir := pkicmn.GetIsdPath(pkicmn.RootDir, isd)
// Check that isd.ini exists, otherwise skip directory.
cpath := filepath.Join(confDir, conf.IsdConfFileName)
if _, err := os.Stat(cpath); os.IsNotExist(err) {
return nil
}
iconf, err := conf.LoadIsdConf(confDir)
if err != nil {
return common.NewBasicError("Error loading TRC conf", err)
}
pkicmn.QuietPrint("Generating TRC for ISD %d\n", isd)
outDir := pkicmn.GetIsdPath(pkicmn.OutDir, isd)
t, err := newTrc(isd, iconf, outDir)
if err != nil {
return err
}
raw, err := t.JSON(true)
if err != nil {
return common.NewBasicError("Error json-encoding TRC", err)
}
// Check if output directory exists.
outDir = filepath.Join(outDir, pkicmn.TRCsDir)
if _, err = os.Stat(outDir); os.IsNotExist(err) {
if err = os.MkdirAll(outDir, 0755); err != nil {
return common.NewBasicError("Cannot create output dir", err, "path", outDir)
}
}
fname := fmt.Sprintf(pkicmn.TrcNameFmt, isd, iconf.Trc.Version)
return pkicmn.WriteToFile(raw, filepath.Join(outDir, fname), 0644)
}
func newTrc(isd addr.ISD, iconf *conf.Isd, path string) (*trc.TRC, error) {
issuingTime := iconf.Trc.IssuingTime
if issuingTime == 0 {
issuingTime = util.TimeToSecs(time.Now())
}
t := &trc.TRC{
CreationTime: iconf.Trc.IssuingTime,
Description: iconf.Desc,
ExpirationTime: issuingTime + uint32(iconf.Trc.Validity.Seconds()),
GracePeriod: uint32(iconf.Trc.GracePeriod.Seconds()),
ISD: isd,
QuorumTRC: iconf.Trc.QuorumTRC,
Version: scrypto.Version(iconf.Trc.Version),
CoreASes: make(map[addr.IA]*trc.CoreAS),
Signatures: make(map[string]common.RawBytes),
RAINS: &trc.Rains{},
RootCAs: make(map[string]*trc.RootCA),
CertLogs: make(map[string]*trc.CertLog),
}
// Load the online/offline root keys.
var ases []coreAS
for _, cia := range iconf.Trc.CoreIAs {
var as coreAS
var err error
as.IA = cia
cpath := filepath.Join(pkicmn.GetAsPath(pkicmn.RootDir, cia), conf.AsConfFileName)
a, err := conf.LoadAsConf(filepath.Dir(cpath))
if err != nil {
return nil, common.NewBasicError("Error loading as.ini", err, "path", cpath)
}
if a.KeyAlgorithms == nil {
return nil, common.NewBasicError("Section missing from as.ini",
nil, "path", cpath, "section", conf.KeyAlgSectionName)
}
as.OnlineKeyAlg = scrypto.Ed25519
if a.KeyAlgorithms.Online != "" {
as.OnlineKeyAlg = a.KeyAlgorithms.Online
}
as.OfflineKeyAlg = scrypto.Ed25519
if a.KeyAlgorithms.Offline != "" {
as.OfflineKeyAlg = a.KeyAlgorithms.Offline
}
keysPath := filepath.Join(pkicmn.GetAsPath(pkicmn.OutDir, cia), pkicmn.KeysDir)
as.OnlineKey, err = keyconf.LoadKey(filepath.Join(keysPath, keyconf.OnKeyFile),
as.OnlineKeyAlg)
if err != nil {
return nil, common.NewBasicError("Error loading online key", err)
}
as.OfflineKey, err = keyconf.LoadKey(
filepath.Join(keysPath, keyconf.OffKeyFile), as.OfflineKeyAlg)
if err != nil {
return nil, common.NewBasicError("Error loading offline key", err)
}
ases = append(ases, as)
}
for _, as := range ases {
pubKeyOnline, err := getPubKey(as.OnlineKey, as.OnlineKeyAlg)
if err != nil {
return nil, err
}
pubKeyOffline, err := getPubKey(as.OfflineKey, as.OfflineKeyAlg)
if err != nil {
return nil, err
}
t.CoreASes[as.IA] = &trc.CoreAS{
OnlineKey: pubKeyOnline,
OnlineKeyAlg: as.OnlineKeyAlg,
OfflineKey: pubKeyOffline,
OfflineKeyAlg: as.OfflineKeyAlg,
}
}
// Sign the TRC.
for _, as := range ases {
if err := t.Sign(as.IA.String(), as.OnlineKey, as.OnlineKeyAlg); err != nil {
return nil, common.NewBasicError("Error signing TRC", err, "signer", as.IA)
}
}
return t, nil
}
func getPubKey(privKey common.RawBytes, keyType string) (common.RawBytes, error) {
switch keyType {
case scrypto.Ed25519:
return common.RawBytes(ed25519.PrivateKey(privKey).Public().(ed25519.PublicKey)), nil
}
return nil, common.NewBasicError("Unsupported key type", nil, "type", keyType)
}
type coreAS struct {
IA addr.IA
OnlineKey common.RawBytes
OfflineKey common.RawBytes
OnlineKeyAlg string
OfflineKeyAlg string
}