/
rev_info.go
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/
rev_info.go
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// Copyright 2017 ETH Zurich
// Copyright 2018 ETH Zurich, Anapaya Systems
//
// 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.
// This file contains the Go representation of a revocation info.
package path_mgmt
import (
"fmt"
"time"
"github.com/scionproto/scion/go/lib/addr"
"github.com/scionproto/scion/go/lib/common"
"github.com/scionproto/scion/go/lib/serrors"
"github.com/scionproto/scion/go/lib/util"
"github.com/scionproto/scion/go/proto"
)
const MinRevTTL = 10 * time.Second // MinRevTTL is the minimum lifetime of a revocation
type RevTimeError string
func NewRevTimeError(r *RevInfo) RevTimeError {
return RevTimeError(fmt.Sprintf(
"Revocation is expired, timestamp: %s, TTL %s.",
util.TimeToCompact(r.Timestamp()), r.TTL()))
}
func (ee RevTimeError) Timeout() bool {
return true
}
func (ee RevTimeError) Error() string {
return string(ee)
}
type RevInfo struct {
IfID common.IFIDType
RawIsdas addr.IA
// LinkType of revocation
LinkType proto.LinkType
// RawTimestamp the issuing timestamp in seconds.
RawTimestamp uint32
// RawTTL validity period of the revocation in seconds
RawTTL uint32
}
func (r *RevInfo) IA() addr.IA {
return r.RawIsdas
}
// Timestamp returns the issuing time stamp of the revocation.
func (r *RevInfo) Timestamp() time.Time {
return util.SecsToTime(r.RawTimestamp)
}
func (r *RevInfo) TTL() time.Duration {
return time.Duration(r.RawTTL) * time.Second
}
func (r *RevInfo) Expiration() time.Time {
return r.Timestamp().Add(r.TTL())
}
func (r *RevInfo) Active() error {
if r.TTL() < MinRevTTL {
return serrors.New("Revocation TTL smaller than MinRevTTL.",
"TTL", r.TTL().Seconds(), "MinRevTTL", MinRevTTL.Seconds())
}
now := time.Now()
// Revocation is not valid if timestamp is not within the TTL window
if r.Expiration().Before(now) {
return NewRevTimeError(r)
}
if r.Timestamp().After(now.Add(time.Second)) {
return serrors.New("Revocation timestamp is in the future.",
"timestamp", util.TimeToCompact(r.Timestamp()))
}
return nil
}
func (r *RevInfo) String() string {
return fmt.Sprintf("IA: %s IfID: %d Link type: %s Timestamp: %s TTL: %s", r.IA(), r.IfID,
r.LinkType, util.TimeToCompact(r.Timestamp()), r.TTL())
}
// RelativeTTL returns the duration r is still valid for, relative to
// reference. If the revocation is already expired, the returned value is 0.
func (r *RevInfo) RelativeTTL(reference time.Time) time.Duration {
expiration := r.Expiration()
if expiration.Before(reference) {
return 0
}
return expiration.Sub(reference)
}
func (r *RevInfo) Equal(other *RevInfo) bool {
if r == nil || other == nil {
return r == other
}
return r.SameIntf(other) &&
r.RawTimestamp == other.RawTimestamp &&
r.RawTTL == other.RawTTL
}
// SameIntf returns true if r and other both apply to the same interface.
func (r *RevInfo) SameIntf(other *RevInfo) bool {
return r.IfID == other.IfID &&
r.RawIsdas == other.RawIsdas &&
r.LinkType == other.LinkType
}