90 lines
2.2 KiB
Go
90 lines
2.2 KiB
Go
// Package aghtls contains utilities for work with TLS.
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package aghtls
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import (
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"crypto/tls"
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"crypto/x509"
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"fmt"
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"net/netip"
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"github.com/AdguardTeam/golibs/log"
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)
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// init makes sure that the cipher name map is filled.
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//
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// TODO(a.garipov): Propose a similar API to crypto/tls.
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func init() {
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suites := tls.CipherSuites()
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cipherSuites = make(map[string]uint16, len(suites))
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for _, s := range suites {
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cipherSuites[s.Name] = s.ID
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}
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log.Debug("tls: known ciphers: %q", cipherSuites)
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}
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// cipherSuites are a name-to-ID mapping of cipher suites from crypto/tls. It
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// is filled by init. It must not be modified.
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var cipherSuites map[string]uint16
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// ParseCiphers parses a slice of cipher suites from cipher names.
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func ParseCiphers(cipherNames []string) (cipherIDs []uint16, err error) {
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if cipherNames == nil {
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return nil, nil
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}
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cipherIDs = make([]uint16, 0, len(cipherNames))
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for _, name := range cipherNames {
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id, ok := cipherSuites[name]
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if !ok {
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return nil, fmt.Errorf("unknown cipher %q", name)
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}
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cipherIDs = append(cipherIDs, id)
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}
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return cipherIDs, nil
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}
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// SaferCipherSuites returns a set of default cipher suites with vulnerable and
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// weak cipher suites removed.
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func SaferCipherSuites() (safe []uint16) {
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for _, s := range tls.CipherSuites() {
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switch s.ID {
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case
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tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA,
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tls.TLS_RSA_WITH_AES_128_CBC_SHA,
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tls.TLS_RSA_WITH_AES_256_CBC_SHA,
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tls.TLS_RSA_WITH_AES_128_CBC_SHA256,
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tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
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tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
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tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
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tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
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tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
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tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
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tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256:
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// Less safe 3DES and CBC suites, go on.
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default:
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safe = append(safe, s.ID)
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}
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}
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return safe
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}
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// CertificateHasIP returns true if cert has at least a single IP address among
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// its subjectAltNames.
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func CertificateHasIP(cert *x509.Certificate) (ok bool) {
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if len(cert.IPAddresses) > 0 {
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return true
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}
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for _, name := range cert.DNSNames {
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if _, err := netip.ParseAddr(name); err == nil {
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return true
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}
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}
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return false
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}
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