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certs: refactor cert manager to support multiple certificates (#10207) 

This commit refactors the certificate management implementation
in the `certs` package such that multiple certificates can be
specified at the same time. Therefore, the following layout of
the `certs/` directory is expected:
```
certs/
 │
 ├─ public.crt
 ├─ private.key
 ├─ CAs/          // CAs directory is ignored
 │   │
 │    ...
 │
 ├─ example.com/
 │   │
 │   ├─ public.crt
 │   └─ private.key
 └─ foobar.org/
     │
     ├─ public.crt
     └─ private.key
   ...
```

However, directory names like `example.com` are just for human
readability/organization and don't have any meaning w.r.t whether
a particular certificate is served or not. This decision is made based
on the SNI sent by the client and the SAN of the certificate.

***

The `Manager` will pick a certificate based on the client trying
to establish a TLS connection. In particular, it looks at the client
hello (i.e. SNI) to determine which host the client tries to access.
If the manager can find a certificate that matches the SNI it
returns this certificate to the client.

However, the client may choose to not send an SNI or tries to access
a server directly via IP (`https://<ip>:<port>`). In this case, we
cannot use the SNI to determine which certificate to serve. However,
we also should not pick "the first" certificate that would be accepted
by the client (based on crypto. parameters - like a signature algorithm)
because it may be an internal certificate that contains internal hostnames. 
We would disclose internal infrastructure details doing so.

Therefore, the `Manager` returns the "default" certificate when the
client does not specify an SNI. The default certificate the top-level
`public.crt` - i.e. `certs/public.crt`.

This approach has some consequences:
 - It's the operator's responsibility to ensure that the top-level
   `public.crt` does not disclose any information (i.e. hostnames)
   that are not publicly visible. However, this was the case in the
   past already.
 - Any other `public.crt` - except for the top-level one - must not
   contain any IP SAN. The reason for this restriction is that the
   Manager cannot match a SNI to an IP b/c the SNI is the server host
   name. The entire purpose of SNI is to indicate which host the client
   tries to connect to when multiple hosts run on the same IP. So, a
   client will not set the SNI to an IP.
   If we would allow IP SANs in a lower-level `public.crt` a user would
   expect that it is possible to connect to MinIO directly via IP address
   and that the MinIO server would pick "the right" certificate. However,
   the MinIO server cannot determine which certificate to serve, and
   therefore always picks the "default" one. This may lead to all sorts
   of confusing errors like:
   "It works if I use `https:instance.minio.local` but not when I use
   `https://10.0.2.1`.

These consequences/limitations should be pointed out / explained in our
docs in an appropriate way. However, the support for multiple
certificates should not have any impact on how deployment with a single
certificate function today.

Co-authored-by: Harshavardhana <harsha@minio.io>
This commit is contained in:
Andreas Auernhammer 2020-09-04 08:33:37 +02:00 committed by GitHub
parent 1c6781757c
commit fbd1c5f51a
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
17 changed files with 454 additions and 246 deletions
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2
cmd/admin-handlers.go
View File

@ -1557,7 +1557,7 @@ func fetchLambdaInfo(cfg config.Config) []map[string][]madmin.TargetIDStatus {
// Fetch the configured targets
tr := NewGatewayHTTPTransport()
defer tr.CloseIdleConnections()
targetList, err := notify.FetchRegisteredTargets(cfg, GlobalContext.Done(), tr, true, false)
targetList, err := notify.FetchRegisteredTargets(GlobalContext, cfg, tr, true, false)
if err != nil && err != notify.ErrTargetsOffline {
logger.LogIf(GlobalContext, err)
return nil

58
cmd/common-main.go
View File

@ -20,6 +20,7 @@ import (
"crypto/x509"
"encoding/gob"
"errors"
"fmt"
"net"
"net/url"
"os"
@ -293,7 +294,7 @@ func logStartupMessage(msg string) {
logger.StartupMessage(msg)
}
func getTLSConfig() (x509Certs []*x509.Certificate, c *certs.Certs, secureConn bool, err error) {
func getTLSConfig() (x509Certs []*x509.Certificate, manager *certs.Manager, secureConn bool, err error) {
if !(isFile(getPublicCertFile()) && isFile(getPrivateKeyFile())) {
return nil, nil, false, nil
}
@ -302,11 +303,62 @@ func getTLSConfig() (x509Certs []*x509.Certificate, c *certs.Certs, secureConn b
return nil, nil, false, err
}
c, err = certs.New(getPublicCertFile(), getPrivateKeyFile(), config.LoadX509KeyPair)
manager, err = certs.NewManager(GlobalContext, getPublicCertFile(), getPrivateKeyFile(), config.LoadX509KeyPair)
if err != nil {
return nil, nil, false, err
}
// MinIO has support for multiple certificates. It expects the following structure:
// certs/
// │
// ├─ public.crt
// ├─ private.key
// │
// ├─ example.com/
// │ │
// │ ├─ public.crt
// │ └─ private.key
// └─ foobar.org/
// │
// ├─ public.crt
// └─ private.key
// ...
//
// Therefore, we read all filenames in the cert directory and check
// for each directory whether it contains a public.crt and private.key.
// If so, we try to add it to certificate manager.
root, err := os.Open(globalCertsDir.Get())
if err != nil {
return nil, nil, false, err
}
defer root.Close()
files, err := root.Readdir(-1)
if err != nil {
return nil, nil, false, err
}
for _, file := range files {
// We exclude any regular file and the "CAs/" directory.
// The "CAs/" directory contains (root) CA certificates
// that MinIO adds to its list of trusted roots (tls.Config.RootCAs).
// Therefore, "CAs/" does not contain X.509 certificates that
// are meant to be served by MinIO.
if !file.IsDir() || file.Name() == "CAs" {
continue
}
var (
certFile = filepath.Join(root.Name(), file.Name(), publicCertFile)
keyFile = filepath.Join(root.Name(), file.Name(), privateKeyFile)
)
if !isFile(certFile) || !isFile(keyFile) {
continue
}
if err := manager.AddCertificate(certFile, keyFile); err != nil {
err = fmt.Errorf("Failed to load TLS certificate '%s': %v", certFile, err)
logger.LogIf(GlobalContext, err, logger.Minio)
}
}
secureConn = true
return x509Certs, c, secureConn, nil
return x509Certs, manager, secureConn, nil
}

7
cmd/config-current.go
View File

@ -306,8 +306,7 @@ func validateConfig(s config.Config, setDriveCount int) error {
return err
}
return notify.TestNotificationTargets(s, GlobalContext.Done(), NewGatewayHTTPTransport(),
globalNotificationSys.ConfiguredTargetIDs())
return notify.TestNotificationTargets(GlobalContext, s, NewGatewayHTTPTransport(), globalNotificationSys.ConfiguredTargetIDs())
}
func lookupConfigs(s config.Config, setDriveCount int) {
@ -487,12 +486,12 @@ func lookupConfigs(s config.Config, setDriveCount int) {
}
}
globalConfigTargetList, err = notify.GetNotificationTargets(s, GlobalContext.Done(), NewGatewayHTTPTransport(), false)
globalConfigTargetList, err = notify.GetNotificationTargets(GlobalContext, s, NewGatewayHTTPTransport(), false)
if err != nil {
logger.LogIf(ctx, fmt.Errorf("Unable to initialize notification target(s): %w", err))
}
globalEnvTargetList, err = notify.GetNotificationTargets(newServerConfig(), GlobalContext.Done(), NewGatewayHTTPTransport(), true)
globalEnvTargetList, err = notify.GetNotificationTargets(GlobalContext, newServerConfig(), NewGatewayHTTPTransport(), true)
if err != nil {
logger.LogIf(ctx, fmt.Errorf("Unable to initialize notification target(s): %w", err))
}

35
cmd/config/notify/parse.go
View File

@ -43,11 +43,10 @@ var ErrTargetsOffline = errors.New("one or more targets are offline. Please use
// TestNotificationTargets is similar to GetNotificationTargets()
// avoids explicit registration.
func TestNotificationTargets(cfg config.Config, doneCh <-chan struct{}, transport *http.Transport,
targetIDs []event.TargetID) error {
func TestNotificationTargets(ctx context.Context, cfg config.Config, transport *http.Transport, targetIDs []event.TargetID) error {
test := true
returnOnTargetError := true
targets, err := RegisterNotificationTargets(cfg, doneCh, transport, targetIDs, test, returnOnTargetError)
targets, err := RegisterNotificationTargets(ctx, cfg, transport, targetIDs, test, returnOnTargetError)
if err == nil {
// Close all targets since we are only testing connections.
for _, t := range targets.TargetMap() {
@ -60,9 +59,9 @@ func TestNotificationTargets(cfg config.Config, doneCh <-chan struct{}, transpor
// GetNotificationTargets registers and initializes all notification
// targets, returns error if any.
func GetNotificationTargets(cfg config.Config, doneCh <-chan struct{}, transport *http.Transport, test bool) (*event.TargetList, error) {
func GetNotificationTargets(ctx context.Context, cfg config.Config, transport *http.Transport, test bool) (*event.TargetList, error) {
returnOnTargetError := false
return RegisterNotificationTargets(cfg, doneCh, transport, nil, test, returnOnTargetError)
return RegisterNotificationTargets(ctx, cfg, transport, nil, test, returnOnTargetError)
}
// RegisterNotificationTargets - returns TargetList which contains enabled targets in serverConfig.
@ -70,8 +69,8 @@ func GetNotificationTargets(cfg config.Config, doneCh <-chan struct{}, transport
// * Add a new target in pkg/event/target package.
// * Add newly added target configuration to serverConfig.Notify.<TARGET_NAME>.
// * Handle the configuration in this function to create/add into TargetList.
func RegisterNotificationTargets(cfg config.Config, doneCh <-chan struct{}, transport *http.Transport, targetIDs []event.TargetID, test bool, returnOnTargetError bool) (*event.TargetList, error) {
targetList, err := FetchRegisteredTargets(cfg, doneCh, transport, test, returnOnTargetError)
func RegisterNotificationTargets(ctx context.Context, cfg config.Config, transport *http.Transport, targetIDs []event.TargetID, test bool, returnOnTargetError bool) (*event.TargetList, error) {
targetList, err := FetchRegisteredTargets(ctx, cfg, transport, test, returnOnTargetError)
if err != nil {
return targetList, err
}
@ -94,7 +93,7 @@ func RegisterNotificationTargets(cfg config.Config, doneCh <-chan struct{}, tran
// FetchRegisteredTargets - Returns a set of configured TargetList
// If `returnOnTargetError` is set to true, The function returns when a target initialization fails
// Else, the function will return a complete TargetList irrespective of errors
func FetchRegisteredTargets(cfg config.Config, doneCh <-chan struct{}, transport *http.Transport, test bool, returnOnTargetError bool) (_ *event.TargetList, err error) {
func FetchRegisteredTargets(ctx context.Context, cfg config.Config, transport *http.Transport, test bool, returnOnTargetError bool) (_ *event.TargetList, err error) {
targetList := event.NewTargetList()
var targetsOffline bool
@ -167,7 +166,7 @@ func FetchRegisteredTargets(cfg config.Config, doneCh <-chan struct{}, transport
if !args.Enable {
continue
}
newTarget, err := target.NewAMQPTarget(id, args, doneCh, logger.LogOnceIf, test)
newTarget, err := target.NewAMQPTarget(id, args, ctx.Done(), logger.LogOnceIf, test)
if err != nil {
targetsOffline = true
if returnOnTargetError {
@ -188,7 +187,7 @@ func FetchRegisteredTargets(cfg config.Config, doneCh <-chan struct{}, transport
if !args.Enable {
continue
}
newTarget, err := target.NewElasticsearchTarget(id, args, doneCh, logger.LogOnceIf, test)
newTarget, err := target.NewElasticsearchTarget(id, args, ctx.Done(), logger.LogOnceIf, test)
if err != nil {
targetsOffline = true
if returnOnTargetError {
@ -209,7 +208,7 @@ func FetchRegisteredTargets(cfg config.Config, doneCh <-chan struct{}, transport
continue
}
args.TLS.RootCAs = transport.TLSClientConfig.RootCAs
newTarget, err := target.NewKafkaTarget(id, args, doneCh, logger.LogOnceIf, test)
newTarget, err := target.NewKafkaTarget(id, args, ctx.Done(), logger.LogOnceIf, test)
if err != nil {
targetsOffline = true
if returnOnTargetError {
@ -230,7 +229,7 @@ func FetchRegisteredTargets(cfg config.Config, doneCh <-chan struct{}, transport
continue
}
args.RootCAs = transport.TLSClientConfig.RootCAs
newTarget, err := target.NewMQTTTarget(id, args, doneCh, logger.LogOnceIf, test)
newTarget, err := target.NewMQTTTarget(id, args, ctx.Done(), logger.LogOnceIf, test)
if err != nil {
targetsOffline = true
if returnOnTargetError {
@ -250,7 +249,7 @@ func FetchRegisteredTargets(cfg config.Config, doneCh <-chan struct{}, transport
if !args.Enable {
continue
}
newTarget, err := target.NewMySQLTarget(id, args, doneCh, logger.LogOnceIf, test)
newTarget, err := target.NewMySQLTarget(id, args, ctx.Done(), logger.LogOnceIf, test)
if err != nil {
targetsOffline = true
if returnOnTargetError {
@ -270,7 +269,7 @@ func FetchRegisteredTargets(cfg config.Config, doneCh <-chan struct{}, transport
if !args.Enable {
continue
}
newTarget, err := target.NewNATSTarget(id, args, doneCh, logger.LogOnceIf, test)
newTarget, err := target.NewNATSTarget(id, args, ctx.Done(), logger.LogOnceIf, test)
if err != nil {
targetsOffline = true
if returnOnTargetError {
@ -290,7 +289,7 @@ func FetchRegisteredTargets(cfg config.Config, doneCh <-chan struct{}, transport
if !args.Enable {
continue
}
newTarget, err := target.NewNSQTarget(id, args, doneCh, logger.LogOnceIf, test)
newTarget, err := target.NewNSQTarget(id, args, ctx.Done(), logger.LogOnceIf, test)
if err != nil {
targetsOffline = true
if returnOnTargetError {
@ -310,7 +309,7 @@ func FetchRegisteredTargets(cfg config.Config, doneCh <-chan struct{}, transport
if !args.Enable {
continue
}
newTarget, err := target.NewPostgreSQLTarget(id, args, doneCh, logger.LogOnceIf, test)
newTarget, err := target.NewPostgreSQLTarget(id, args, ctx.Done(), logger.LogOnceIf, test)
if err != nil {
targetsOffline = true
if returnOnTargetError {
@ -330,7 +329,7 @@ func FetchRegisteredTargets(cfg config.Config, doneCh <-chan struct{}, transport
if !args.Enable {
continue
}
newTarget, err := target.NewRedisTarget(id, args, doneCh, logger.LogOnceIf, test)
newTarget, err := target.NewRedisTarget(id, args, ctx.Done(), logger.LogOnceIf, test)
if err != nil {
targetsOffline = true
if returnOnTargetError {
@ -350,7 +349,7 @@ func FetchRegisteredTargets(cfg config.Config, doneCh <-chan struct{}, transport
if !args.Enable {
continue
}
newTarget, err := target.NewWebhookTarget(id, args, doneCh, logger.LogOnceIf, transport, test)
newTarget, err := target.NewWebhookTarget(ctx, id, args, logger.LogOnceIf, transport, test)
if err != nil {
targetsOffline = true
if returnOnTargetError {

3
cmd/gateway-main.go
View File

@ -293,9 +293,6 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
newObject, err := gw.NewGatewayLayer(globalActiveCred)
if err != nil {
// Stop watching for any certificate changes.
globalTLSCerts.Stop()
globalHTTPServer.Shutdown()
logger.FatalIf(err, "Unable to initialize gateway backend")
}

2
cmd/globals.go
View File

@ -167,7 +167,7 @@ var (
// IsSSL indicates if the server is configured with SSL.
globalIsSSL bool
globalTLSCerts *certs.Certs
globalTLSCerts *certs.Manager
globalHTTPServer *xhttp.Server
globalHTTPServerErrorCh = make(chan error)

3
cmd/server-main.go
View File

@ -506,9 +506,6 @@ func serverMain(ctx *cli.Context) {
newObject, err := newObjectLayer(GlobalContext, globalEndpoints)
logger.SetDeploymentID(globalDeploymentID)
if err != nil {
// Stop watching for any certificate changes.
globalTLSCerts.Stop()
globalHTTPServer.Shutdown()
logger.Fatal(err, "Unable to initialize backend")
}

3
cmd/signals.go
View File

@ -50,9 +50,6 @@ func handleSignals() {
globalNotificationSys.RemoveAllRemoteTargets()
}
// Stop watching for any certificate changes.
globalTLSCerts.Stop()
if httpServer := newHTTPServerFn(); httpServer != nil {
err = httpServer.Shutdown()
logger.LogIf(context.Background(), err)

468
pkg/certs/certs.go
View File

@ -17,7 +17,11 @@
package certs
import (
"context"
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"os"
"path/filepath"
"sync"
@ -26,177 +30,317 @@ import (
"github.com/rjeczalik/notify"
)
// A Certs represents a certificate manager able to watch certificate
// and key pairs for changes.
type Certs struct {
sync.RWMutex
// user input params.
certFile string
keyFile string
loadCert LoadX509KeyPairFunc
// points to the latest certificate.
cert *tls.Certificate
// internal param to track for events, also
// used to close the watcher.
e chan notify.EventInfo
}
// LoadX509KeyPairFunc - provides a type for custom cert loader function.
// LoadX509KeyPairFunc is a function that parses a private key and
// certificate file and returns a TLS certificate on success.
type LoadX509KeyPairFunc func(certFile, keyFile string) (tls.Certificate, error)
// New initializes a new certs monitor.
func New(certFile, keyFile string, loadCert LoadX509KeyPairFunc) (*Certs, error) {
certFileIsLink, err := checkSymlink(certFile)
if err != nil {
return nil, err
}
keyFileIsLink, err := checkSymlink(keyFile)
if err != nil {
return nil, err
}
c := &Certs{
certFile: certFile,
keyFile: keyFile,
loadCert: loadCert,
// Make the channel buffered to ensure no event is dropped. Notify will drop
// an event if the receiver is not able to keep up the sending pace.
e: make(chan notify.EventInfo, 1),
}
// GetCertificateFunc is a callback that allows a TLS stack deliver different
// certificates based on the client trying to establish a TLS connection.
//
// For example, a GetCertificateFunc can return different TLS certificates depending
// upon the TLS SNI sent by the client.
type GetCertificateFunc func(hello *tls.ClientHelloInfo) (*tls.Certificate, error)
if certFileIsLink && keyFileIsLink {
if err := c.watchSymlinks(); err != nil {
return nil, err
}
} else {
if err := c.watch(); err != nil {
return nil, err
}
}
// Manager is a TLS certificate manager that can handle multiple certificates.
// When a client tries to establish a TLS connection, Manager will try to
// pick a certificate that can be validated by the client.
//
// For instance, if the client specifies a TLS SNI then Manager will try to
// find the corresponding certificate. If there is no such certificate it
// will fallback to the certificate named public.crt.
//
// Manager will automatically reload certificates if the corresponding file changes.
type Manager struct {
lock sync.RWMutex
certificates map[pair]*tls.Certificate // Mapping: certificate file name => TLS certificates
defaultCert pair
return c, nil
loadX509KeyPair LoadX509KeyPairFunc
events chan notify.EventInfo
ctx context.Context
}
func checkSymlink(file string) (bool, error) {
// pair represents a certificate and private key file tuple.
type pair struct {
KeyFile string
CertFile string
}
// NewManager returns a new Manager that handles one certificate specified via
// the certFile and keyFile. It will use the loadX509KeyPair function to (re)load
// certificates.
//
// The certificate loaded from certFile is considered the default certificate.
// If a client does not send the TLS SNI extension then Manager will return
// this certificate.
func NewManager(ctx context.Context, certFile, keyFile string, loadX509KeyPair LoadX509KeyPairFunc) (manager *Manager, err error) {
certFile, err = filepath.Abs(certFile)
if err != nil {
return nil, err
}
keyFile, err = filepath.Abs(keyFile)
if err != nil {
return nil, err
}
manager = &Manager{
certificates: map[pair]*tls.Certificate{},
defaultCert: pair{
KeyFile: keyFile,
CertFile: certFile,
},
loadX509KeyPair: loadX509KeyPair,
events: make(chan notify.EventInfo, 1),
ctx: ctx,
}
if err := manager.AddCertificate(certFile, keyFile); err != nil {
return nil, err
}
go manager.watchFileEvents()
return manager, nil
}
// AddCertificate adds the TLS certificate in certFile resp. keyFile
// to the Manager.
//
// If there is already a certificate with the same base name it will be
// replaced by the newly added one.
func (m *Manager) AddCertificate(certFile, keyFile string) (err error) {
certFile, err = filepath.Abs(certFile)
if err != nil {
return err
}
keyFile, err = filepath.Abs(keyFile)
if err != nil {
return err
}
certFileIsLink, err := isSymlink(certFile)
if err != nil {
return err
}
keyFileIsLink, err := isSymlink(keyFile)
if err != nil {
return err
}
if certFileIsLink && !keyFileIsLink {
return fmt.Errorf("certs: '%s' is a symlink but '%s' is a regular file", certFile, keyFile)
}
if keyFileIsLink && !certFileIsLink {
return fmt.Errorf("certs: '%s' is a symlink but '%s' is a regular file", keyFile, certFile)
}
certificate, err := m.loadX509KeyPair(certFile, keyFile)
if err != nil {
return err
}
// We set the certificate leaf to the actual certificate such that
// we don't have to do the parsing (multiple times) when matching the
// certificate to the client hello. This a performance optimisation.
if certificate.Leaf == nil {
certificate.Leaf, err = x509.ParseCertificate(certificate.Certificate[0])
if err != nil {
return err
}
}
p := pair{
CertFile: certFile,
KeyFile: keyFile,
}
m.lock.Lock()
defer m.lock.Unlock()
// We don't allow IP SANs in certificates - except for the "default" certificate
// which is, by convention, the first certificate added to the manager. The problem
// with allowing IP SANs in more than one certificate is that the manager usually can't
// match the client SNI to a SAN since the SNI is meant to communicate the destination
// host name and clients will not set the SNI to an IP address.
// Allowing multiple certificates with IP SANs lead to errors that confuses users - like:
// "It works for `https://instance.minio.local` but not for `https://10.0.2.1`"
if len(m.certificates) > 0 && len(certificate.Leaf.IPAddresses) > 0 {
return errors.New("cert: certificate must not contain any IP SANs: only the default certificate may contain IP SANs")
}
m.certificates[p] = &certificate
if certFileIsLink && keyFileIsLink {
go m.watchSymlinks(certFile, keyFile)
} else {
// Windows doesn't allow for watching file changes but instead allows
// for directory changes only, while we can still watch for changes
// on files on other platforms. Watch parent directory on all platforms
// for simplicity.
if err = notify.Watch(filepath.Dir(certFile), m.events, eventWrite...); err != nil {
return err
}
if err = notify.Watch(filepath.Dir(keyFile), m.events, eventWrite...); err != nil {
return err
}
}
return nil
}
// watchSymlinks starts an endless loop reloading the
// certFile and keyFile periodically.
func (m *Manager) watchSymlinks(certFile, keyFile string) {
for {
select {
case <-m.ctx.Done():
return // Once stopped exits this routine.
case <-time.After(24 * time.Hour):
certificate, err := m.loadX509KeyPair(certFile, keyFile)
if err != nil {
continue
}
if certificate.Leaf == nil { // This is a performance optimisation
certificate.Leaf, err = x509.ParseCertificate(certificate.Certificate[0])
if err != nil {
continue
}
}
p := pair{
CertFile: certFile,
KeyFile: keyFile,
}
m.lock.Lock()
m.certificates[p] = &certificate
m.lock.Unlock()
}
}
}
// watchFileEvents starts an endless loop waiting for file systems events.
// Once an event occurs it reloads the private key and certificate that
// has changed, if any.
func (m *Manager) watchFileEvents() {
for {
select {
case <-m.ctx.Done():
return
case event := <-m.events:
if !isWriteEvent(event.Event()) {
continue
}
for pair := range m.certificates {
if p := event.Path(); pair.KeyFile == p || pair.CertFile == p {
certificate, err := m.loadX509KeyPair(pair.CertFile, pair.KeyFile)
if err != nil {
continue
}
if certificate.Leaf == nil { // This is performance optimisation
certificate.Leaf, err = x509.ParseCertificate(certificate.Certificate[0])
if err != nil {
continue
}
}
m.lock.Lock()
m.certificates[pair] = &certificate
m.lock.Unlock()
}
}
}
}
}
// GetCertificate returns a TLS certificate based on the client hello.
//
// It tries to find a certificate that would be accepted by the client
// according to the client hello. However, if no certificate can be
// found GetCertificate returns the certificate loaded from the
// Public file.
func (m *Manager) GetCertificate(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
m.lock.RLock()
defer m.lock.RUnlock()
// If the client does not send a SNI we return the "default"
// certificate. A client may not send a SNI - e.g. when trying
// to connect to an IP directly (https://<ip>:<port>).
//
// In this case we don't know which the certificate the client
// asks for. It may be a public-facing certificate issued by a
// public CA or an internal certificate containing internal domain
// names.
// Now, we should not serve "the first" certificate that would be
// accepted by the client based on the Client Hello. Otherwise, we
// may expose an internal certificate to the client that contains
// internal domain names. That way we would disclose internal
// infrastructure details.
//
// Therefore, we serve the "default" certificate - which by convention
// is the first certificate added to the Manager. It's the calling code's
// responsibility to ensure that the "public-facing" certificate is used
// when creating a Manager instance.
if hello.ServerName == "" {
certificate := m.certificates[m.defaultCert]
return certificate, nil
}
// Optimization: If there is just one certificate, always serve that one.
if len(m.certificates) == 1 {
for _, certificate := range m.certificates {
return certificate, nil
}
}
// Iterate over all certificates and return the first one that would
// be accepted by the peer (TLS client) based on the client hello.
// In particular, the client usually specifies the requested host/domain
// via SNI.
//
// Note: The certificate.Leaf should be non-nil and contain the actual
// client certificate of MinIO that should be presented to the peer (TLS client).
// Otherwise, the leaf certificate has to be parsed again - which is kind of
// expensive and may cause a performance issue. For more information, check the
// docs of tls.ClientHelloInfo.SupportsCertificate.
for _, certificate := range m.certificates {
if err := hello.SupportsCertificate(certificate); err == nil {
return certificate, nil
}
}
return nil, errors.New("certs: no server certificate is supported by peer")
}
// GetClientCertificate returns a TLS certificate for mTLS based on the
// certificate request.
//
// It tries to find a certificate that would be accepted by the server
// according to the certificate request. However, if no certificate can be
// found GetClientCertificate returns the certificate loaded from the
// Public file.
func (m *Manager) GetClientCertificate(reqInfo *tls.CertificateRequestInfo) (*tls.Certificate, error) {
m.lock.RLock()
defer m.lock.RUnlock()
// Optimization: If there is just one certificate, always serve that one.
if len(m.certificates) == 1 {
for _, certificate := range m.certificates {
return certificate, nil
}
}
// Iterate over all certificates and return the first one that would
// be accepted by the peer (TLS server) based on reqInfo.
//
// Note: The certificate.Leaf should be non-nil and contain the actual
// client certificate of MinIO that should be presented to the peer (TLS server).
// Otherwise, the leaf certificate has to be parsed again - which is kind of
// expensive and may cause a performance issue. For more information, check the
// docs of tls.CertificateRequestInfo.SupportsCertificate.
for _, certificate := range m.certificates {
if err := reqInfo.SupportsCertificate(certificate); err == nil {
return certificate, nil
}
}
return nil, errors.New("certs: no client certificate is supported by peer")
}
// isSymlink returns true if the given file
// is a symbolic link.
func isSymlink(file string) (bool, error) {
st, err := os.Lstat(file)
if err != nil {
return false, err
}
return st.Mode()&os.ModeSymlink == os.ModeSymlink, nil
}
// watchSymlinks reloads symlinked files since fsnotify cannot watch
// on symbolic links.
func (c *Certs) watchSymlinks() (err error) {
cert, err := c.loadCert(c.certFile, c.keyFile)
if err != nil {
return err
}
c.Lock()
c.cert = &cert
c.Unlock()
go func() {
for {
select {
case <-c.e:
// Once stopped exits this routine.
return
case <-time.After(24 * time.Hour):
cert, cerr := c.loadCert(c.certFile, c.keyFile)
if cerr != nil {
continue
}
c.Lock()
c.cert = &cert
c.Unlock()
}
}
}()
return nil
}
// watch starts watching for changes to the certificate
// and key files. On any change the certificate and key
// are reloaded. If there is an issue the loading will fail
// and the old (if any) certificates and keys will continue
// to be used.
func (c *Certs) watch() (err error) {
defer func() {
if err != nil {
// Stop any watches previously setup after an error.
notify.Stop(c.e)
}
}()
// Windows doesn't allow for watching file changes but instead allows
// for directory changes only, while we can still watch for changes
// on files on other platforms. Watch parent directory on all platforms
// for simplicity.
if err = notify.Watch(filepath.Dir(c.certFile), c.e, eventWrite...); err != nil {
return err
}
if err = notify.Watch(filepath.Dir(c.keyFile), c.e, eventWrite...); err != nil {
return err
}
cert, err := c.loadCert(c.certFile, c.keyFile)
if err != nil {
return err
}
c.Lock()
c.cert = &cert
c.Unlock()
if err != nil {
return err
}
go c.run()
return nil
}
func (c *Certs) run() {
for event := range c.e {
base := filepath.Base(event.Path())
if isWriteEvent(event.Event()) {
certChanged := base == filepath.Base(c.certFile)
keyChanged := base == filepath.Base(c.keyFile)
if certChanged || keyChanged {
cert, err := c.loadCert(c.certFile, c.keyFile)
if err != nil {
// ignore the error continue to use
// old certificates.
continue
}
c.Lock()
c.cert = &cert
c.Unlock()
}
}
}
}
// GetCertificateFunc provides a GetCertificate type for custom client implementations.
type GetCertificateFunc func(hello *tls.ClientHelloInfo) (*tls.Certificate, error)
// GetCertificate returns the loaded certificate for use by
// the TLSConfig fields GetCertificate field in a http.Server.
func (c *Certs) GetCertificate(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
c.RLock()
defer c.RUnlock()
return c.cert, nil
}
// GetClientCertificate returns the loaded certificate for use by
// the TLSConfig fields GetClientCertificate field in a http.Server.
func (c *Certs) GetClientCertificate(_ *tls.CertificateRequestInfo) (*tls.Certificate, error) {
c.RLock()
defer c.RUnlock()
return c.cert, nil
}
// Stop tells loader to stop watching for changes to the
// certificate and key files.
func (c *Certs) Stop() {
if c != nil {
notify.Stop(c.e)
}
}

55
pkg/certs/certs_test.go
View File

@ -17,6 +17,7 @@
package certs_test
import (
"context"
"crypto/tls"
"io"
"os"
@ -31,55 +32,57 @@ func updateCerts(crt, key string) {
// ignore error handling
crtSource, _ := os.Open(crt)
defer crtSource.Close()
crtDest, _ := os.Create("server.crt")
crtDest, _ := os.Create("public.crt")
defer crtDest.Close()
io.Copy(crtDest, crtSource)
keySource, _ := os.Open(key)
defer keySource.Close()
keyDest, _ := os.Create("server.key")
keyDest, _ := os.Create("private.key")
defer keyDest.Close()
io.Copy(keyDest, keySource)
}
func TestCertNew(t *testing.T) {
c, err := certs.New("server.crt", "server.key", tls.LoadX509KeyPair)
func TestNewManager(t *testing.T) {
ctx, cancelFn := context.WithCancel(context.Background())
defer cancelFn()
c, err := certs.NewManager(ctx, "public.crt", "private.key", tls.LoadX509KeyPair)
if err != nil {
t.Fatal(err)
}
defer c.Stop()
hello := &tls.ClientHelloInfo{}
gcert, err := c.GetCertificate(hello)
if err != nil {
t.Fatal(err)
}
expectedCert, err := tls.LoadX509KeyPair("server.crt", "server.key")
expectedCert, err := tls.LoadX509KeyPair("public.crt", "private.key")
if err != nil {
t.Fatal(err)
}
if !reflect.DeepEqual(gcert.Certificate, expectedCert.Certificate) {
t.Error("certificate doesn't match expected certificate")
}
_, err = certs.New("server.crt", "server2.key", tls.LoadX509KeyPair)
_, err = certs.NewManager(ctx, "public.crt", "new-private.key", tls.LoadX509KeyPair)
if err == nil {
t.Fatal("Expected to fail but got success")
}
}
func TestValidPairAfterWrite(t *testing.T) {
expectedCert, err := tls.LoadX509KeyPair("server2.crt", "server2.key")
ctx, cancelFn := context.WithCancel(context.Background())
defer cancelFn()
expectedCert, err := tls.LoadX509KeyPair("new-public.crt", "new-private.key")
if err != nil {
t.Fatal(err)
}
c, err := certs.New("server.crt", "server.key", tls.LoadX509KeyPair)
c, err := certs.NewManager(ctx, "public.crt", "private.key", tls.LoadX509KeyPair)
if err != nil {
t.Fatal(err)
}
defer c.Stop()
updateCerts("server2.crt", "server2.key")
defer updateCerts("server1.crt", "server1.key")
updateCerts("new-public.crt", "new-private.key")
defer updateCerts("original-public.crt", "original-private.key")
// Wait for the write event..
time.Sleep(200 * time.Millisecond)
@ -104,31 +107,3 @@ func TestValidPairAfterWrite(t *testing.T) {
t.Error("client certificate doesn't match expected certificate")
}
}
func TestStop(t *testing.T) {
expectedCert, err := tls.LoadX509KeyPair("server2.crt", "server2.key")
if err != nil {
t.Fatal(err)
}
c, err := certs.New("server.crt", "server.key", tls.LoadX509KeyPair)
if err != nil {
t.Fatal(err)
}
c.Stop()
// No one is listening on the event, will be ignored and
// certificate will not be reloaded.
updateCerts("server2.crt", "server2.key")
defer updateCerts("server1.crt", "server1.key")
hello := &tls.ClientHelloInfo{}
gcert, err := c.GetCertificate(hello)
if err != nil {
t.Fatal(err)
}
if reflect.DeepEqual(gcert.Certificate, expectedCert.Certificate) {
t.Error("certificate shouldn't match, but matched")
}
}

0
pkg/certs/server2.key → pkg/certs/new-private.key
View File

0
pkg/certs/server2.crt → pkg/certs/new-public.crt
View File

0
pkg/certs/server1.key → pkg/certs/original-private.key
View File

0
pkg/certs/server1.crt → pkg/certs/original-public.crt
View File

28
pkg/certs/private.key Normal file
View File

@ -0,0 +1,28 @@
-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----

22
pkg/certs/public.crt Normal file
View File

@ -0,0 +1,22 @@
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

14
pkg/event/target/webhook.go
View File

@ -215,10 +215,8 @@ func (target *WebhookTarget) Close() error {
}
// NewWebhookTarget - creates new Webhook target.
func NewWebhookTarget(id string, args WebhookArgs, doneCh <-chan struct{}, loggerOnce func(ctx context.Context, err error, id interface{}, kind ...interface{}), transport *http.Transport, test bool) (*WebhookTarget, error) {
func NewWebhookTarget(ctx context.Context, id string, args WebhookArgs, loggerOnce func(ctx context.Context, err error, id interface{}, kind ...interface{}), transport *http.Transport, test bool) (*WebhookTarget, error) {
var store Store
target := &WebhookTarget{
id: event.TargetID{ID: id, Name: "webhook"},
args: args,
@ -226,11 +224,11 @@ func NewWebhookTarget(id string, args WebhookArgs, doneCh <-chan struct{}, logge
}
if target.args.ClientCert != "" && target.args.ClientKey != "" {
c, err := certs.New(target.args.ClientCert, target.args.ClientKey, tls.LoadX509KeyPair)
manager, err := certs.NewManager(ctx, target.args.ClientCert, target.args.ClientKey, tls.LoadX509KeyPair)
if err != nil {
return target, err
}
transport.TLSClientConfig.GetClientCertificate = c.GetClientCertificate
transport.TLSClientConfig.GetClientCertificate = manager.GetClientCertificate
}
target.httpClient = &http.Client{Transport: transport}
@ -247,16 +245,16 @@ func NewWebhookTarget(id string, args WebhookArgs, doneCh <-chan struct{}, logge
_, err := target.IsActive()
if err != nil {
if target.store == nil || err != errNotConnected {
target.loggerOnce(context.Background(), err, target.ID())
target.loggerOnce(ctx, err, target.ID())
return target, err
}
}
if target.store != nil && !test {
// Replays the events from the store.
eventKeyCh := replayEvents(target.store, doneCh, target.loggerOnce, target.ID())
eventKeyCh := replayEvents(target.store, ctx.Done(), target.loggerOnce, target.ID())
// Start replaying events from the store.
go sendEvents(target, eventKeyCh, doneCh, target.loggerOnce)
go sendEvents(target, eventKeyCh, ctx.Done(), target.loggerOnce)
}
return target, nil