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package tlsreload
import (
"context"
"crypto/tls"
"crypto/x509"
"errors"
"log/slog"
"sync"
"time"
"github.com/johnandersen777/socialweb-computer-kcp/internal/contract/vault"
)
var ErrNoServerName = errors.New("tlsreload: the connection names no server to verify")
func TrustPool(ctx context.Context, trust vault.Trust, log *slog.Logger) (*Pool, func()) {
p := &Pool{log: logOrDiscard(log)}
return p, p.Follow(ctx, trust)
}
func EmptyPool(log *slog.Logger) *Pool {
return &Pool{log: logOrDiscard(log)}
}
func SecretPool(read func(ctx context.Context) ([]byte, error), renew time.Duration, log *slog.Logger) *Pool {
return NewPool(func(ctx context.Context) (*x509.CertPool, time.Time, error) {
data, err := read(ctx)
if err != nil {
return nil, time.Time{}, err
}
pool, err := parsePool(data)
if err != nil {
return nil, time.Time{}, err
}
return pool, time.Now().Add(renew), nil
}, log)
}
func (p *Pool) Follow(ctx context.Context, trust vault.Trust) func() {
if trust == nil {
return func() {}
}
cancel := trust.Watch(func(bundle []byte) { p.feed(bundle) })
if bundle, err := trust.CABundle(ctx); err != nil {
p.log.Warn("no CA bundle is published yet; the pool fills when it is", "err", err)
} else {
p.feed(bundle)
}
return cancel
}
func (p *Pool) feed(bundle []byte) {
if len(bundle) == 0 {
return
}
if err := p.Set(bundle); err != nil {
p.log.Warn("keeping the last CA pool", "err", err)
return
}
p.log.Info("loaded the published CA pool")
}
func (p *Pool) ClientConfig(base *tls.Config) *tls.Config {
return p.clientConfig(base, false)
}
func (p *Pool) PublicClientConfig(base *tls.Config) *tls.Config {
return p.clientConfig(base, true)
}
func (p *Pool) clientConfig(base *tls.Config, system bool) *tls.Config {
cfg := &tls.Config{MinVersion: tls.VersionTLS12}
if base != nil {
cfg = base.Clone()
}
cfg.RootCAs = nil
cfg.InsecureSkipVerify = true
inner := cfg.VerifyConnection
cfg.VerifyConnection = func(cs tls.ConnectionState) error {
if err := p.verify(cs, system); err != nil {
return err
}
if inner != nil {
return inner(cs)
}
return nil
}
return cfg
}
func (p *Pool) verify(cs tls.ConnectionState, system bool) error {
if len(cs.PeerCertificates) == 0 {
return errors.New("tlsreload: the peer sent no certificate")
}
if cs.ServerName == "" {
return ErrNoServerName
}
intermediates := x509.NewCertPool()
for _, cert := range cs.PeerCertificates[1:] {
intermediates.AddCert(cert)
}
opts := x509.VerifyOptions{DNSName: cs.ServerName, Intermediates: intermediates}
if system {
if _, err := cs.PeerCertificates[0].Verify(opts); err == nil {
return nil
}
}
roots, err := p.Current(context.Background())
if err != nil {
return err
}
opts.Roots = roots
_, err = cs.PeerCertificates[0].Verify(opts)
return err
}
type Pools struct {
mu sync.Mutex
entries map[string]poolEntry
}
type poolEntry struct {
fingerprint string
pool *Pool
stop func()
}
func (ps *Pools) Get(name, fingerprint string, open func() (*Pool, func(), error)) (*Pool, error) {
ps.mu.Lock()
defer ps.mu.Unlock()
if e, ok := ps.entries[name]; ok && e.fingerprint == fingerprint {
return e.pool, nil
}
pool, stop, err := open()
if err != nil {
return nil, err
}
if ps.entries == nil {
ps.entries = map[string]poolEntry{}
}
if e, ok := ps.entries[name]; ok && e.stop != nil {
e.stop()
}
ps.entries[name] = poolEntry{fingerprint: fingerprint, pool: pool, stop: stop}
return pool, nil
}
func (ps *Pools) Drop(name string) {
ps.mu.Lock()
e, ok := ps.entries[name]
delete(ps.entries, name)
ps.mu.Unlock()
if ok && e.stop != nil {
e.stop()
}
}
