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instance.go
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instance.go
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// Copyright 2016 Google LLC. All Rights Reserved.
//
// 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 sctfe
import (
"context"
"crypto"
"fmt"
"strconv"
"strings"
"time"
"github.com/google/certificate-transparency-go/asn1"
"github.com/google/certificate-transparency-go/x509util"
"github.com/google/trillian/monitoring"
"golang.org/x/mod/sumdb/note"
)
// InstanceOptions describes the options for a log instance.
type InstanceOptions struct {
// Validated holds the original configuration options for the log, and some
// of its fields parsed as a result of validating it.
Validated *ValidatedLogConfig
// CreateStorage instantiates a Tessera storage implementation with a signer option.
CreateStorage func(context.Context, note.Signer) (*CTStorage, error)
// Deadline is a timeout for Tessera requests.
Deadline time.Duration
// MetricFactory allows creating metrics.
MetricFactory monitoring.MetricFactory
// ErrorMapper converts an error from an RPC request to an HTTP status, plus
// a boolean to indicate whether the conversion succeeded.
ErrorMapper func(error) (int, bool)
// RequestLog provides structured logging of CTFE requests.
RequestLog RequestLog
MaskInternalErrors bool
}
// Instance is a set up log/mirror instance. It must be created with the
// SetUpInstance call.
type Instance struct {
Handlers PathHandlers
li *logInfo
}
// GetPublicKey returns the public key from the instance's signer.
func (i *Instance) GetPublicKey() crypto.PublicKey {
if i.li != nil && i.li.signer != nil {
return i.li.signer.Public()
}
return nil
}
// SetUpInstance sets up a log (or log mirror) instance using the provided
// configuration, and returns an object containing a set of handlers for this
// log, and an STH getter.
func SetUpInstance(ctx context.Context, opts InstanceOptions) (*Instance, error) {
cfg := opts.Validated
// Load the trusted roots.
roots := x509util.NewPEMCertPool()
if err := roots.AppendCertsFromPEMFile(cfg.RootsPemFile); err != nil {
return nil, fmt.Errorf("failed to read trusted roots: %v", err)
}
validationOpts := CertValidationOpts{
trustedRoots: roots,
rejectExpired: cfg.RejectExpired,
rejectUnexpired: cfg.RejectUnexpired,
notAfterStart: cfg.NotAfterStart,
notAfterLimit: cfg.NotAfterLimit,
extKeyUsages: cfg.KeyUsages,
}
var err error
validationOpts.rejectExtIds, err = parseOIDs(cfg.RejectExtensions)
if err != nil {
return nil, fmt.Errorf("failed to parse RejectExtensions: %v", err)
}
logID, err := GetCTLogID(cfg.Signer.Public())
if err != nil {
return nil, fmt.Errorf("failed to get logID for signing: %v", err)
}
timeSource := new(SystemTimeSource)
ctSigner := NewCpSigner(cfg.Signer, cfg.Origin, logID, timeSource)
if opts.CreateStorage == nil {
return nil, fmt.Errorf("failed to initiate storage backend: nil createStorage")
}
storage, err := opts.CreateStorage(ctx, ctSigner)
if err != nil {
return nil, fmt.Errorf("failed to initiate storage backend: %v", err)
}
logInfo := newLogInfo(opts, validationOpts, cfg.Signer, timeSource, storage)
handlers := logInfo.Handlers(opts.Validated.Origin)
return &Instance{Handlers: handlers, li: logInfo}, nil
}
func parseOIDs(oids []string) ([]asn1.ObjectIdentifier, error) {
ret := make([]asn1.ObjectIdentifier, 0, len(oids))
for _, s := range oids {
bits := strings.Split(s, ".")
var oid asn1.ObjectIdentifier
for _, n := range bits {
p, err := strconv.Atoi(n)
if err != nil {
return nil, err
}
oid = append(oid, p)
}
ret = append(ret, oid)
}
return ret, nil
}