/
tls.go
69 lines (62 loc) · 1.9 KB
/
tls.go
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// Copyright 2016 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package prober
import (
"crypto/sha256"
"crypto/tls"
"encoding/hex"
"time"
)
func getEarliestCertExpiry(state *tls.ConnectionState) time.Time {
earliest := time.Time{}
for _, cert := range state.PeerCertificates {
if (earliest.IsZero() || cert.NotAfter.Before(earliest)) && !cert.NotAfter.IsZero() {
earliest = cert.NotAfter
}
}
return earliest
}
func getFingerprint(state *tls.ConnectionState) string {
cert := state.PeerCertificates[0]
fingerprint := sha256.Sum256(cert.Raw)
return hex.EncodeToString(fingerprint[:])
}
func getLastChainExpiry(state *tls.ConnectionState) time.Time {
lastChainExpiry := time.Time{}
for _, chain := range state.VerifiedChains {
earliestCertExpiry := time.Time{}
for _, cert := range chain {
if (earliestCertExpiry.IsZero() || cert.NotAfter.Before(earliestCertExpiry)) && !cert.NotAfter.IsZero() {
earliestCertExpiry = cert.NotAfter
}
}
if lastChainExpiry.IsZero() || lastChainExpiry.Before(earliestCertExpiry) {
lastChainExpiry = earliestCertExpiry
}
}
return lastChainExpiry
}
func getTLSVersion(state *tls.ConnectionState) string {
switch state.Version {
case tls.VersionTLS10:
return "TLS 1.0"
case tls.VersionTLS11:
return "TLS 1.1"
case tls.VersionTLS12:
return "TLS 1.2"
case tls.VersionTLS13:
return "TLS 1.3"
default:
return "unknown"
}
}