bake: add wildcard to fs entitlements to allow any paths

Signed-off-by: CrazyMax <[email protected]>

bake/entitlements.go

@@ -326,16 +326,18 @@ func isParentOrEqualPath(p, parent string) bool {
 }
 
 func findMissingPaths(set []string, paths map[string]struct{}) ([]string, error) {
-	paths, err := evaluateToExistingPaths(paths)
+	set, allowAny, err := evaluatePaths(set)
 	if err != nil {
 		return nil, err
+	} else if allowAny {
+		return nil, nil
 	}
-	paths, err = dedupPaths(paths)
+
+	paths, err = evaluateToExistingPaths(paths)
 	if err != nil {
 		return nil, err
 	}
-
-	set, err = evaluatePaths(set)
+	paths, err = dedupPaths(paths)
 	if err != nil {
 		return nil, err
 	}
@@ -441,6 +443,27 @@ func removeCommonPaths(in, common []string) []string {
 	return filtered
 }
 
+func evaluatePaths(in []string) ([]string, bool, error) {
+	out := make([]string, 0, len(in))
+	allowAny := false
+	for _, p := range in {
+		if p == "*" {
+			allowAny = true
+			continue
+		}
+		v, err := filepath.Abs(p)
+		if err != nil {
+			return nil, false, errors.Wrapf(err, "failed to evaluate path %q", p)
+		}
+		v, err = filepath.EvalSymlinks(v)
+		if err != nil {
+			return nil, false, errors.Wrapf(err, "failed to evaluate path %q", p)
+		}
+		out = append(out, v)
+	}
+	return out, allowAny, nil
+}
+
 func evaluateToExistingPaths(in map[string]struct{}) (map[string]struct{}, error) {
 	m := make(map[string]struct{}, len(in))
 	for p := range in {

bake/entitlements_test.go

@@ -343,6 +343,31 @@ func TestValidateEntitlements(t *testing.T) {
 			conf: EntitlementConf{
 				FSRead: []string{"/"},
 			},
+			expected: EntitlementConf{
+				FSRead: func() []string {
+					// on windows root (/) is only allowed if it is the same volume as wd
+					if filepath.VolumeName(wd) == filepath.VolumeName(escapeLink) {
+						return nil
+					}
+					// if not, then escapeLink is not allowed
+					p, err := evaluateToExistingPath(escapeLink)
+					require.NoError(t, err)
+					return []string{p}
+				}(),
+			},
+		},
+		{
+			name: "SecretFromEscapeLinkAllowAny",
+			opt: build.Options{
+				SecretSpecs: []*pb.Secret{
+					{
+						FilePath: escapeLink,
+					},
+				},
+			},
+			conf: EntitlementConf{
+				FSRead: []string{"*"},
+			},
 			expected: EntitlementConf{},
 		},
 	}