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crypto/tls: randomly generate ticket_age_add

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As required by RFC 8446, section 4.6.1, ticket_age_add now holds a
random 32-bit value. Before this change, this value was always set
to 0.

This change also documents the reasoning for always setting
ticket_nonce to 0. The value ticket_nonce must be unique per
connection, but we only ever send one ticket per connection.

Fixes #52814
Fixes CVE-2022-30629

Change-Id: I6c2fc6ca0376b7b968abd59d6d3d3854c1ab68bb
Reviewed-on: https://go-review.googlesource.com/c/go/+/405994
Reviewed-by: Tatiana Bradley <tatiana@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Run-TryBot: Tatiana Bradley <tatiana@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Tatiana Bradley 2022-05-12 14:58:29 -04:00
parent 1c77137d4f
commit fe4de36198
1 changed files with 14 additions and 0 deletions
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14
src/crypto/tls/handshake_server_tls13.go
View file

@ -10,6 +10,7 @@ import (
"crypto"
"crypto/hmac"
"crypto/rsa"
"encoding/binary"
"errors"
"hash"
"io"
@ -745,6 +746,19 @@ func (hs *serverHandshakeStateTLS13) sendSessionTickets() error {
}
m.lifetime = uint32(maxSessionTicketLifetime / time.Second)
// ticket_age_add is a random 32-bit value. See RFC 8446, section 4.6.1
// The value is not stored anywhere; we never need to check the ticket age
// because 0-RTT is not supported.
ageAdd := make([]byte, 4)
_, err = hs.c.config.rand().Read(ageAdd)
if err != nil {
return err
}
m.ageAdd = binary.LittleEndian.Uint32(ageAdd)
// ticket_nonce, which must be unique per connection, is always left at
// zero because we only ever send one ticket per connection.
if _, err := c.writeRecord(recordTypeHandshake, m.marshal()); err != nil {
return err
}