compat handlers: add X-Registry-Auth header support

 * Support the `X-Registry-Auth` http-request header.

 * The content of the header is a base64 encoded JSON payload which can
   either be a single auth config or a map of auth configs (user+pw or
   token) with the corresponding registries being the keys.  Vanilla
   Docker, projectatomic Docker and the bindings are transparantly
   supported.

 * Add a hidden `--registries-conf` flag.  Buildah exposes the same
   flag, mostly for testing purposes.

 * Do all credential parsing in the client (i.e., `cmd/podman`) pass
   the username and password in the backend instead of unparsed
   credentials.

 * Add a `pkg/auth` which handles most of the heavy lifting.

 * Go through the authentication-handling code of most commands, bindings
   and endpoints.  Migrate them to the new code and fix issues as seen.
   A final evaluation and more tests is still required *after* this
   change.

 * The manifest-push endpoint is missing certain parameters and should
   use the ABI function instead.  Adding auth-support isn't really
   possible without these parts working.

 * The container commands and endpoints (i.e., create and run) have not
   been changed yet.  The APIs don't yet account for the authfile.

 * Add authentication tests to `pkg/bindings`.

Fixes: #6384
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

2 files changed, 32 insertions, 13 deletions

diff --git a/pkg/api/handlers/compat/images.go b/pkg/api/handlers/compat/images.go
index ea9cbd691..b64ed0036 100644
--- a/pkg/api/handlers/compat/images.go
+++ b/pkg/api/handlers/compat/images.go
@@ -15,6 +15,7 @@ import (
 	image2 "github.com/containers/libpod/libpod/image"
 	"github.com/containers/libpod/pkg/api/handlers"
 	"github.com/containers/libpod/pkg/api/handlers/utils"
+	"github.com/containers/libpod/pkg/auth"
 	"github.com/containers/libpod/pkg/domain/entities"
 	"github.com/containers/libpod/pkg/util"
 	"github.com/docker/docker/api/types"
@@ -251,19 +252,32 @@ func CreateImageFromImage(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	/*
-	   fromImage – Name of the image to pull. The name may include a tag or digest. This parameter may only be used when pulling an image. The pull is cancelled if the HTTP connection is closed.
-	   repo – Repository name given to an image when it is imported. The repo may include a tag. This parameter may only be used when importing an image.
-	   tag – Tag or digest. If empty when pulling an image, this causes all tags for the given image to be pulled.
-	*/
 	fromImage := query.FromImage
 	if len(query.Tag) >= 1 {
 		fromImage = fmt.Sprintf("%s:%s", fromImage, query.Tag)
 	}
 
-	// TODO
-	// We are eating the output right now because we haven't talked about how to deal with multiple responses yet
-	img, err := runtime.ImageRuntime().New(r.Context(), fromImage, "", "", nil, &image2.DockerRegistryOptions{}, image2.SigningOptions{}, nil, util.PullImageMissing)
+	authConf, authfile, err := auth.GetCredentials(r)
+	if err != nil {
+		utils.Error(w, "Something went wrong.", http.StatusBadRequest, errors.Wrapf(err, "Failed to parse %q header for %s", auth.XRegistryAuthHeader, r.URL.String()))
+		return
+	}
+	defer auth.RemoveAuthfile(authfile)
+
+	registryOpts := image2.DockerRegistryOptions{DockerRegistryCreds: authConf}
+	if sys := runtime.SystemContext(); sys != nil {
+		registryOpts.DockerCertPath = sys.DockerCertPath
+	}
+	img, err := runtime.ImageRuntime().New(r.Context(),
+		fromImage,
+		"", // signature policy
+		authfile,
+		nil, // writer
+		&registryOpts,
+		image2.SigningOptions{},
+		nil, // label
+		util.PullImageMissing,
+	)
 	if err != nil {
 		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, err)
 		return
diff --git a/pkg/api/handlers/compat/images_push.go b/pkg/api/handlers/compat/images_push.go
index 2260d5557..47976b7c9 100644
--- a/pkg/api/handlers/compat/images_push.go
+++ b/pkg/api/handlers/compat/images_push.go
@@ -9,6 +9,7 @@ import (
 	"github.com/containers/libpod/libpod"
 	"github.com/containers/libpod/libpod/image"
 	"github.com/containers/libpod/pkg/api/handlers/utils"
+	"github.com/containers/libpod/pkg/auth"
 	"github.com/gorilla/schema"
 	"github.com/pkg/errors"
 )
@@ -48,13 +49,17 @@ func PushImage(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	// TODO: the X-Registry-Auth header is not checked yet here nor in any other
-	// endpoint. Pushing does NOT work with authentication at the moment.
-	dockerRegistryOptions := &image.DockerRegistryOptions{}
-	authfile := ""
+	authConf, authfile, err := auth.GetCredentials(r)
+	if err != nil {
+		utils.Error(w, "Something went wrong.", http.StatusBadRequest, errors.Wrapf(err, "Failed to parse %q header for %s", auth.XRegistryAuthHeader, r.URL.String()))
+		return
+	}
+	defer auth.RemoveAuthfile(authfile)
+
+	dockerRegistryOptions := &image.DockerRegistryOptions{DockerRegistryCreds: authConf}
 	if sys := runtime.SystemContext(); sys != nil {
 		dockerRegistryOptions.DockerCertPath = sys.DockerCertPath
-		authfile = sys.AuthFilePath
+		dockerRegistryOptions.RegistriesConfPath = sys.SystemRegistriesConfPath
 	}
 
 	err = newImage.PushImageToHeuristicDestination(