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tls_config.go
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tls_config.go
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// Provenance-includes-location: https://github.com/weaveworks/common/blob/main/server/tls_config.go
// Provenance-includes-license: Apache-2.0
// Provenance-includes-copyright: Weaveworks Ltd.
package server
import (
"crypto/tls"
fmt "fmt"
"strings"
"github.com/prometheus/exporter-toolkit/web"
)
// Collect all cipher suite names and IDs recognized by Go, including insecure ones.
func allCiphers() map[string]web.Cipher {
acceptedCiphers := make(map[string]web.Cipher)
for _, suite := range tls.CipherSuites() {
acceptedCiphers[suite.Name] = web.Cipher(suite.ID)
}
for _, suite := range tls.InsecureCipherSuites() {
acceptedCiphers[suite.Name] = web.Cipher(suite.ID)
}
return acceptedCiphers
}
func stringToCipherSuites(s string) ([]web.Cipher, error) {
if s == "" {
return nil, nil
}
ciphersSlice := []web.Cipher{}
possibleCiphers := allCiphers()
for _, cipher := range strings.Split(s, ",") {
intValue, ok := possibleCiphers[cipher]
if !ok {
return nil, fmt.Errorf("cipher suite %q not recognized", cipher)
}
ciphersSlice = append(ciphersSlice, intValue)
}
return ciphersSlice, nil
}
// Using the same names that Kubernetes does
var tlsVersions = map[string]uint16{
"VersionTLS10": tls.VersionTLS10,
"VersionTLS11": tls.VersionTLS11,
"VersionTLS12": tls.VersionTLS12,
"VersionTLS13": tls.VersionTLS13,
}
func stringToTLSVersion(s string) (web.TLSVersion, error) {
if s == "" {
return 0, nil
}
if version, ok := tlsVersions[s]; ok {
return web.TLSVersion(version), nil
}
return 0, fmt.Errorf("TLS version %q not recognized", s)
}