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package daemon
import (
"net/http"
"path/filepath"
"github.com/containers/image/v5/types"
dockerclient "github.com/docker/docker/client"
"github.com/docker/go-connections/tlsconfig"
)
const (
// The default API version to be used in case none is explicitly specified
defaultAPIVersion = "1.22"
)
// NewDockerClient initializes a new API client based on the passed SystemContext.
func newDockerClient(sys *types.SystemContext) (*dockerclient.Client, error) {
host := dockerclient.DefaultDockerHost
if sys != nil && sys.DockerDaemonHost != "" {
host = sys.DockerDaemonHost
}
opts := []dockerclient.Opt{
dockerclient.WithHost(host),
dockerclient.WithVersion(defaultAPIVersion),
}
// We conditionalize building the TLS configuration only to TLS sockets:
//
// The dockerclient.Client implementation differentiates between
// - Client.proto, which is ~how the connection is establishe (IP / AF_UNIX/Windows)
// - Client.scheme, which is what is sent over the connection (HTTP with/without TLS).
//
// Only Client.proto is set from the URL in dockerclient.WithHost(),
// Client.scheme is detected based on a http.Client.TLSClientConfig presence;
// dockerclient.WithHTTPClient with a client that has TLSClientConfig set
// will, by default, trigger an attempt to use TLS.
//
// So, don’t use WithHTTPClient for unix:// sockets at all.
//
// Similarly, if we want to communicate over plain HTTP on a TCP socket (http://),
// we also should not set TLSClientConfig. We continue to use WithHTTPClient
// with our slightly non-default settings to avoid a behavior change on updates of c/image.
//
// Alternatively we could use dockerclient.WithScheme to drive the TLS/non-TLS logic
// explicitly, but we would still want to set WithHTTPClient (differently) for https:// and http:// ;
// so that would not be any simpler.
serverURL, err := dockerclient.ParseHostURL(host)
if err != nil {
return nil, err
}
switch serverURL.Scheme {
case "unix": // Nothing
case "http":
hc := httpConfig()
opts = append(opts, dockerclient.WithHTTPClient(hc))
default:
hc, err := tlsConfig(sys)
if err != nil {
return nil, err
}
opts = append(opts, dockerclient.WithHTTPClient(hc))
}
return dockerclient.NewClientWithOpts(opts...)
}
func tlsConfig(sys *types.SystemContext) (*http.Client, error) {
options := tlsconfig.Options{}
if sys != nil && sys.DockerDaemonInsecureSkipTLSVerify {
options.InsecureSkipVerify = true
}
if sys != nil && sys.DockerDaemonCertPath != "" {
options.CAFile = filepath.Join(sys.DockerDaemonCertPath, "ca.pem")
options.CertFile = filepath.Join(sys.DockerDaemonCertPath, "cert.pem")
options.KeyFile = filepath.Join(sys.DockerDaemonCertPath, "key.pem")
}
tlsc, err := tlsconfig.Client(options)
if err != nil {
return nil, err
}
return &http.Client{
Transport: &http.Transport{
TLSClientConfig: tlsc,
},
CheckRedirect: dockerclient.CheckRedirect,
}, nil
}
func httpConfig() *http.Client {
return &http.Client{
Transport: &http.Transport{
TLSClientConfig: nil,
},
CheckRedirect: dockerclient.CheckRedirect,
}
}
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