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crypto/tls: implement TLS 1.3 PSK authentication (client side)

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Also check original certificate validity when resuming TLS 1.0–1.2. Will
refuse to resume a session if the certificate is expired or if the
original connection had InsecureSkipVerify and the resumed one doesn't.

Support only PSK+DHE to protect forward secrecy even with lack of a
strong session ticket rotation story.

Tested with NSS because s_server does not provide any way of getting the
same session ticket key across invocations. Will self-test like TLS
1.0–1.2 once server side is implemented.

Incorporates CL 128477 by @santoshankr.

Fixes #24919
Updates #9671

Change-Id: Id3eaa5b6c77544a1357668bf9ff255f3420ecc34
Reviewed-on: https://go-review.googlesource.com/c/147420
Reviewed-by: Adam Langley <agl@golang.org>
This commit is contained in:
Filippo Valsorda 2018-11-04 18:41:37 -05:00
parent 5b79a7c982
commit dc9021e679
11 changed files with 444 additions and 158 deletions
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11
key_schedule.go
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@ -6,6 +6,7 @@ package tls
import (
"crypto/elliptic"
"crypto/hmac"
"errors"
"golang_org/x/crypto/cryptobyte"
"golang_org/x/crypto/curve25519"
@ -77,6 +78,16 @@ func (c *cipherSuiteTLS13) trafficKey(trafficSecret []byte) (key, iv []byte) {
return
}
// finishedHash generates the Finished verify_data or PskBinderEntry according
// to RFC 8446, Section 4.4.4. See sections 4.4 and 4.2.11.2 for the baseKey
// selection.
func (c *cipherSuiteTLS13) finishedHash(baseKey []byte, transcript hash.Hash) []byte {
finishedKey := c.expandLabel(baseKey, "finished", nil, c.hash.Size())
verifyData := hmac.New(c.hash.New, finishedKey)
verifyData.Write(transcript.Sum(nil))
return verifyData.Sum(nil)
}
// exportKeyingMaterial implements RFC5705 exporters for TLS 1.3 according to
// RFC 8446, Section 7.5.
func (c *cipherSuiteTLS13) exportKeyingMaterial(masterSecret []byte, transcript hash.Hash) func(string, []byte, int) ([]byte, error) {