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load.go
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load.go
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package docker
import (
"crypto/tls"
"crypto/x509"
"encoding/pem"
"fmt"
"net"
"net/http"
"os"
"time"
"github.com/docker/cli/cli/connhelper"
"github.com/docker/cli/cli/context"
"github.com/docker/cli/cli/context/store"
"github.com/docker/docker/client"
"github.com/docker/go-connections/tlsconfig"
"github.com/pkg/errors"
)
// EndpointMeta is a typed wrapper around a context-store generic endpoint describing
// a Docker Engine endpoint, without its tls config
type EndpointMeta = context.EndpointMetaBase
// Endpoint is a typed wrapper around a context-store generic endpoint describing
// a Docker Engine endpoint, with its tls data
type Endpoint struct {
EndpointMeta
TLSData *context.TLSData
TLSPassword string
}
// WithTLSData loads TLS materials for the endpoint
func WithTLSData(s store.Reader, contextName string, m EndpointMeta) (Endpoint, error) {
tlsData, err := context.LoadTLSData(s, contextName, DockerEndpoint)
if err != nil {
return Endpoint{}, err
}
return Endpoint{
EndpointMeta: m,
TLSData: tlsData,
}, nil
}
// tlsConfig extracts a context docker endpoint TLS config
func (c *Endpoint) tlsConfig() (*tls.Config, error) {
if c.TLSData == nil && !c.SkipTLSVerify {
// there is no specific tls config
return nil, nil
}
var tlsOpts []func(*tls.Config)
if c.TLSData != nil && c.TLSData.CA != nil {
certPool := x509.NewCertPool()
if !certPool.AppendCertsFromPEM(c.TLSData.CA) {
return nil, errors.New("failed to retrieve context tls info: ca.pem seems invalid")
}
tlsOpts = append(tlsOpts, func(cfg *tls.Config) {
cfg.RootCAs = certPool
})
}
if c.TLSData != nil && c.TLSData.Key != nil && c.TLSData.Cert != nil {
keyBytes := c.TLSData.Key
pemBlock, _ := pem.Decode(keyBytes)
if pemBlock == nil {
return nil, fmt.Errorf("no valid private key found")
}
var err error
if x509.IsEncryptedPEMBlock(pemBlock) {
keyBytes, err = x509.DecryptPEMBlock(pemBlock, []byte(c.TLSPassword))
if err != nil {
return nil, errors.Wrap(err, "private key is encrypted, but could not decrypt it")
}
keyBytes = pem.EncodeToMemory(&pem.Block{Type: pemBlock.Type, Bytes: keyBytes})
}
x509cert, err := tls.X509KeyPair(c.TLSData.Cert, keyBytes)
if err != nil {
return nil, errors.Wrap(err, "failed to retrieve context tls info")
}
tlsOpts = append(tlsOpts, func(cfg *tls.Config) {
cfg.Certificates = []tls.Certificate{x509cert}
})
}
if c.SkipTLSVerify {
tlsOpts = append(tlsOpts, func(cfg *tls.Config) {
cfg.InsecureSkipVerify = true
})
}
return tlsconfig.ClientDefault(tlsOpts...), nil
}
// ClientOpts returns a slice of Client options to configure an API client with this endpoint
func (c *Endpoint) ClientOpts() ([]client.Opt, error) {
var result []client.Opt
if c.Host != "" {
helper, err := connhelper.GetConnectionHelper(c.Host)
if err != nil {
return nil, err
}
if helper == nil {
tlsConfig, err := c.tlsConfig()
if err != nil {
return nil, err
}
result = append(result,
withHTTPClient(tlsConfig),
client.WithHost(c.Host),
)
} else {
httpClient := &http.Client{
// No tls
// No proxy
Transport: &http.Transport{
DialContext: helper.Dialer,
},
}
result = append(result,
client.WithHTTPClient(httpClient),
client.WithHost(helper.Host),
client.WithDialContext(helper.Dialer),
)
}
}
version := os.Getenv("DOCKER_API_VERSION")
if version != "" {
result = append(result, client.WithVersion(version))
} else {
result = append(result, client.WithAPIVersionNegotiation())
}
return result, nil
}
func withHTTPClient(tlsConfig *tls.Config) func(*client.Client) error {
return func(c *client.Client) error {
if tlsConfig == nil {
// Use the default HTTPClient
return nil
}
httpClient := &http.Client{
Transport: &http.Transport{
TLSClientConfig: tlsConfig,
DialContext: (&net.Dialer{
KeepAlive: 30 * time.Second,
Timeout: 30 * time.Second,
}).DialContext,
},
CheckRedirect: client.CheckRedirect,
}
return client.WithHTTPClient(httpClient)(c)
}
}
// EndpointFromContext parses a context docker endpoint metadata into a typed EndpointMeta structure
func EndpointFromContext(metadata store.Metadata) (EndpointMeta, error) {
ep, ok := metadata.Endpoints[DockerEndpoint]
if !ok {
return EndpointMeta{}, errors.New("cannot find docker endpoint in context")
}
typed, ok := ep.(EndpointMeta)
if !ok {
return EndpointMeta{}, errors.Errorf("endpoint %q is not of type EndpointMeta", DockerEndpoint)
}
return typed, nil
}