mirror of
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b8043e4f05
Merge in DNS/adguard-home from AGDNS-3060-imp-gocognit-logs to master
Squashed commit of the following:
commit 3026dc35662c71c125c60198f828e7da7e8e5b4f
Merge: 2b56f4236 df258512d
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date: Wed Jul 30 13:00:44 2025 +0300
Merge branch 'master' into AGDNS-3060-imp-gocognit-logs
commit 2b56f423649ef0e5734a3a1d9c0b5df178462e29
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date: Fri Jul 25 14:41:40 2025 +0300
all: imp docs
commit 101d043c85e8b813f6b28751edeeb6c6b43578a9
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date: Wed Jul 23 20:09:38 2025 +0300
all: imp code
commit 87cfa502f7abf5b8f8a18b71f4a99aab9a066961
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date: Wed Jul 23 14:51:33 2025 +0300
all: imp code
commit 07c1a04a4022f4e38282a538670d575fba949bb2
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date: Tue Jul 22 20:04:58 2025 +0300
all: imp gocognit, logs
84 lines
2.3 KiB
Go
84 lines
2.3 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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"context"
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"crypto/tls"
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"crypto/x509"
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"fmt"
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"log/slog"
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"slices"
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"github.com/AdguardTeam/golibs/netutil"
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)
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// Init populates the cipherSuites map with the name-to-ID mapping of cipher
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// suites from crypto/tls. It must be called only once, and it must be called
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// before any function that calls [ParseCiphers].
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//
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// TODO(a.garipov): Propose a similar API to crypto/tls.
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func Init(ctx context.Context, l *slog.Logger) {
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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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l.DebugContext(ctx, "known ciphers", "ciphers", 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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return len(cert.IPAddresses) > 0 || slices.ContainsFunc(cert.DNSNames, netutil.IsValidIPString)
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}
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