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|
package cms
import (
"bytes"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"encoding/asn1"
"io"
"io/ioutil"
"math/big"
"net/http"
"time"
"github.com/github/smimesign/fakeca"
"github.com/github/smimesign/ietf-cms/oid"
"github.com/github/smimesign/ietf-cms/protocol"
"github.com/github/smimesign/ietf-cms/timestamp"
)
var (
// fake PKI setup
root = fakeca.New(fakeca.IsCA)
otherRoot = fakeca.New(fakeca.IsCA)
intermediateKey, _ = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
intermediate = root.Issue(fakeca.IsCA, fakeca.PrivateKey(intermediateKey))
leaf = intermediate.Issue(
fakeca.NotBefore(time.Now().Add(-time.Hour)),
fakeca.NotAfter(time.Now().Add(time.Hour)),
)
rootOpts = x509.VerifyOptions{Roots: root.ChainPool()}
otherRootOpts = x509.VerifyOptions{Roots: otherRoot.ChainPool()}
intermediateOpts = x509.VerifyOptions{Roots: intermediate.ChainPool()}
// fake timestamp authority setup
tsa = &testTSA{ident: intermediate.Issue()}
thc = &testHTTPClient{tsa}
)
func init() {
timestamp.DefaultHTTPClient = thc
}
type testTSA struct {
ident *fakeca.Identity
sn int64
hookInfo func(timestamp.Info) timestamp.Info
hookToken func(*protocol.SignedData) *protocol.SignedData
hookResponse func(timestamp.Response) timestamp.Response
}
func (tt *testTSA) Clear() {
tt.hookInfo = nil
tt.hookToken = nil
tt.hookResponse = nil
}
func (tt *testTSA) HookInfo(hook func(timestamp.Info) timestamp.Info) {
tt.Clear()
tt.hookInfo = hook
}
func (tt *testTSA) HookToken(hook func(*protocol.SignedData) *protocol.SignedData) {
tt.Clear()
tt.hookToken = hook
}
func (tt *testTSA) HookResponse(hook func(timestamp.Response) timestamp.Response) {
tt.Clear()
tt.hookResponse = hook
}
func (tt *testTSA) nextSN() *big.Int {
defer func() { tt.sn++ }()
return big.NewInt(tt.sn)
}
func (tt *testTSA) Do(req timestamp.Request) (timestamp.Response, error) {
info := timestamp.Info{
Version: 1,
Policy: asn1.ObjectIdentifier{1, 2, 3},
SerialNumber: tt.nextSN(),
GenTime: time.Now(),
MessageImprint: req.MessageImprint,
Nonce: req.Nonce,
}
if tt.hookInfo != nil {
info = tt.hookInfo(info)
}
eciDER, err := asn1.Marshal(info)
if err != nil {
panic(err)
}
eci, err := protocol.NewEncapsulatedContentInfo(oid.ContentTypeTSTInfo, eciDER)
if err != nil {
panic(err)
}
tst, err := protocol.NewSignedData(eci)
if err != nil {
panic(err)
}
if err = tst.AddSignerInfo(tsa.ident.Chain(), tsa.ident.PrivateKey); err != nil {
panic(err)
}
if tt.hookToken != nil {
tt.hookToken(tst)
}
ci, err := tst.ContentInfo()
if err != nil {
panic(err)
}
resp := timestamp.Response{
Status: timestamp.PKIStatusInfo{Status: 0},
TimeStampToken: ci,
}
if tt.hookResponse != nil {
resp = tt.hookResponse(resp)
}
return resp, nil
}
type testHTTPClient struct {
tt *testTSA
}
func (thc *testHTTPClient) Do(httpReq *http.Request) (*http.Response, error) {
buf := new(bytes.Buffer)
if _, err := io.Copy(buf, httpReq.Body); err != nil {
return nil, err
}
var tsReq timestamp.Request
if _, err := asn1.Unmarshal(buf.Bytes(), &tsReq); err != nil {
return nil, err
}
tsResp, err := thc.tt.Do(tsReq)
if err != nil {
return nil, err
}
respDER, err := asn1.Marshal(tsResp)
if err != nil {
return nil, err
}
return &http.Response{
StatusCode: 200,
Header: http.Header{"Content-Type": {"application/timestamp-reply"}},
Body: ioutil.NopCloser(bytes.NewReader(respDER)),
}, nil
}
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