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crypto/tls: optional "certificate_status" with OCSP

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Follows the wording in RFC4366 more precisely which allows a server
to optionally return a "certificate_status" when responding to a
client hello containing "status_request" extension.

fixes #8549

Change-Id: Ib02dc9f972da185b25554568fe6f8bc411d9c0b7
Reviewed-on: https://go-review.googlesource.com/86115
Reviewed-by: Adam Langley <agl@golang.org>
This commit is contained in:
Brad Burch 2018-01-04 00:42:10 -06:00 committed by Henry Dorsett Case
parent eaa1196b44
commit 0957fdb171
1 changed files with 20 additions and 12 deletions
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16
handshake_client.go
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@ -444,27 +444,35 @@ func (hs *clientHandshakeState) doFullHandshake() error {
} }
} }
if hs.serverHello.ocspStapling {
msg, err = c.readHandshake() msg, err = c.readHandshake()
if err != nil { if err != nil {
return err return err
} }
cs, ok := msg.(*certificateStatusMsg) cs, ok := msg.(*certificateStatusMsg)
if !ok { if ok {
// RFC4366 on Certificate Status Request:
// The server MAY return a "certificate_status" message.
if !hs.serverHello.ocspStapling {
// If a server returns a "CertificateStatus" message, then the
// server MUST have included an extension of type "status_request"
// with empty "extension_data" in the extended server hello.
c.sendAlert(alertUnexpectedMessage) c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(cs, msg) return errors.New("tls: received unexpected CertificateStatus message")
} }
hs.finishedHash.Write(cs.marshal()) hs.finishedHash.Write(cs.marshal())
if cs.statusType == statusTypeOCSP { if cs.statusType == statusTypeOCSP {
c.ocspResponse = cs.response c.ocspResponse = cs.response
} }
}
msg, err = c.readHandshake() msg, err = c.readHandshake()
if err != nil { if err != nil {
return err return err
} }
}
keyAgreement := hs.suite.ka(c.vers) keyAgreement := hs.suite.ka(c.vers)