bake: restrict target name

This fix adds a restriction `[a-zA-Z0-9_-]+`
for target name. This is pretty much the same as the
container name restriction in moby.

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

bake/bake.go

@@ -22,8 +22,13 @@ import (
 	"github.com/pkg/errors"
 )
 
-var httpPrefix = regexp.MustCompile(`^https?://`)
-var gitURLPathWithFragmentSuffix = regexp.MustCompile(`\.git(?:#.+)?$`)
+var (
+	httpPrefix                   = regexp.MustCompile(`^https?://`)
+	gitURLPathWithFragmentSuffix = regexp.MustCompile(`\.git(?:#.+)?$`)
+
+	validTargetNameChars = `[a-zA-Z0-9_-]+`
+	targetNamePattern    = regexp.MustCompile(`^` + validTargetNameChars + `$`)
+)
 
 type File struct {
 	Name string
@@ -176,8 +181,9 @@ func ParseFiles(files []File, defaults map[string]string) (_ *Config, err error)
 
 	if len(fs) > 0 {
 		if err := hclparser.Parse(hcl.MergeFiles(fs), hclparser.Opt{
-			LookupVar: os.LookupEnv,
-			Vars:      defaults,
+			LookupVar:     os.LookupEnv,
+			Vars:          defaults,
+			ValidateLabel: validateTargetName,
 		}, &c); err.HasErrors() {
 			return nil, err
 		}
@@ -798,3 +804,10 @@ func parseOutputType(str string) string {
 	}
 	return ""
 }
+
+func validateTargetName(name string) error {
+	if !targetNamePattern.MatchString(name) {
+		return errors.Errorf("only %q are allowed", validTargetNameChars)
+	}
+	return nil
+}

bake/bake_test.go

@@ -788,3 +788,58 @@ group "default" {
 		})
 	}
 }
+
+func TestTargetName(t *testing.T) {
+	ctx := context.TODO()
+	cases := []struct {
+		target  string
+		wantErr bool
+	}{
+		{
+			target:  "a",
+			wantErr: false,
+		},
+		{
+			target:  "abc",
+			wantErr: false,
+		},
+		{
+			target:  "a/b",
+			wantErr: true,
+		},
+		{
+			target:  "a.b",
+			wantErr: true,
+		},
+		{
+			target:  "_a",
+			wantErr: false,
+		},
+		{
+			target:  "a_b",
+			wantErr: false,
+		},
+		{
+			target:  "AbC",
+			wantErr: false,
+		},
+		{
+			target:  "AbC-0123",
+			wantErr: false,
+		},
+	}
+	for _, tt := range cases {
+		tt := tt
+		t.Run(tt.target, func(t *testing.T) {
+			_, _, err := ReadTargets(ctx, []File{{
+				Name: "docker-bake.hcl",
+				Data: []byte(`target "` + tt.target + `" {}`),
+			}}, []string{tt.target}, nil, nil)
+			if tt.wantErr {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+			}
+		})
+	}
+}

bake/compose.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/compose-spec/compose-go/loader"
 	compose "github.com/compose-spec/compose-go/types"
+	"github.com/pkg/errors"
 )
 
 func parseCompose(dt []byte) (*compose.Project, error) {
@@ -59,6 +60,10 @@ func ParseCompose(dt []byte) (*Config, error) {
 				continue
 			}
 
+			if err = validateTargetName(s.Name); err != nil {
+				return nil, errors.Wrapf(err, "invalid service name %q", s.Name)
+			}
+
 			var contextPathP *string
 			if s.Build.Context != "" {
 				contextPath := s.Build.Context

bake/compose_test.go

@@ -314,3 +314,55 @@ func newBool(val bool) *bool {
 	b := val
 	return &b
 }
+
+func TestServiceName(t *testing.T) {
+	cases := []struct {
+		svc     string
+		wantErr bool
+	}{
+		{
+			svc:     "a",
+			wantErr: false,
+		},
+		{
+			svc:     "abc",
+			wantErr: false,
+		},
+		{
+			svc:     "a.b",
+			wantErr: true,
+		},
+		{
+			svc:     "_a",
+			wantErr: false,
+		},
+		{
+			svc:     "a_b",
+			wantErr: false,
+		},
+		{
+			svc:     "AbC",
+			wantErr: false,
+		},
+		{
+			svc:     "AbC-0123",
+			wantErr: false,
+		},
+	}
+	for _, tt := range cases {
+		tt := tt
+		t.Run(tt.svc, func(t *testing.T) {
+			_, err := ParseCompose([]byte(`
+services:
+  ` + tt.svc + `:
+    build:
+      context: .
+`))
+			if tt.wantErr {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+			}
+		})
+	}
+}

bake/hcl.go

@@ -3,7 +3,7 @@ package bake
 import (
 	"strings"
 
-	hcl "github.com/hashicorp/hcl/v2"
+	"github.com/hashicorp/hcl/v2"
 	"github.com/hashicorp/hcl/v2/hclparse"
 	"github.com/moby/buildkit/solver/errdefs"
 	"github.com/moby/buildkit/solver/pb"

bake/hclparser/hclparser.go

@@ -16,8 +16,9 @@ import (
 )
 
 type Opt struct {
-	LookupVar func(string) (string, bool)
-	Vars      map[string]string
+	LookupVar     func(string) (string, bool)
+	Vars          map[string]string
+	ValidateLabel func(string) error
 }
 
 type variable struct {
@@ -262,6 +263,12 @@ func Parse(b hcl.Body, opt Opt, val interface{}) hcl.Diagnostics {
 		}
 	}
 
+	if opt.ValidateLabel == nil {
+		opt.ValidateLabel = func(string) error {
+			return nil
+		}
+	}
+
 	p := &parser{
 		opt: opt,
 
@@ -446,6 +453,17 @@ func Parse(b hcl.Body, opt Opt, val interface{}) hcl.Diagnostics {
 			continue
 		}
 
+		if err := opt.ValidateLabel(b.Labels[0]); err != nil {
+			return hcl.Diagnostics{
+				&hcl.Diagnostic{
+					Severity: hcl.DiagError,
+					Summary:  "Invalid name",
+					Detail:   err.Error(),
+					Subject:  &b.LabelRanges[0],
+				},
+			}
+		}
+
 		lblIndex := setLabel(vv, b.Labels[0])
 
 		oldValue, exists := t.values[b.Labels[0]]