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Handle cert expiration or rotation

This commit is contained in:
Andrey Meshkov 2018-12-18 01:45:19 +03:00
parent b30b6b1d66
commit 45626b139d
1 changed files with 13 additions and 1 deletions
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14
dnsforward/upstream.go
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@ -203,7 +203,8 @@ func (p *dnsCrypt) Exchange(m *dns.Msg) (*dns.Msg, error) {
serverInfo = p.serverInfo
p.RUnlock()
if client == nil || serverInfo == nil {
now := uint32(time.Now().Unix())
if client == nil || serverInfo == nil || (serverInfo != nil && serverInfo.ServerCert.NotAfter < now) {
p.Lock()
// Using "udp" for DNSCrypt upstreams by default
@ -222,6 +223,17 @@ func (p *dnsCrypt) Exchange(m *dns.Msg) (*dns.Msg, error) {
}
reply, _, err := client.Exchange(m, serverInfo)
if err, ok := err.(net.Error); ok && err.Timeout() {
// If request times out, it is possible that the server configuration has been changed.
// It is safe to assume that the key was rotated (for instance, as it is described here: https://dnscrypt.pl/2017/02/26/how-key-rotation-is-automated/).
// We should re-fetch the server certificate info so that the new requests were not failing.
p.Lock()
p.client = nil
p.serverInfo = nil
p.Unlock()
}
return reply, err
}