binman: add tests for sign option

Add the test which provides sequence of actions:
  1. create the image from binman dts
  2. create public and private keys
  3. add public key into dtb with fdt_add_pubkey
  4. 1. sign FIT container with new sign option with extracting from
        image
     2. sign exact FIT container with replacing of it in image
  5. check with fit_check_sign

Signed-off-by: Ivan Mikhaylov <fr0st61te@gmail.com>
Renumber test file from 277 to 280;
   Move UpdateSignatures() to Entry base class;
   Don't allow missing mkimage as it doesn't make sense;
   Propagate --toolpath for CI;
   Call mark_build_done() to avoid regenerating FIT:
Signed-off-by: Simon Glass <sjg@chromium.org>

tools/binman/control.py

@@ -464,6 +464,8 @@ def SignEntries(image_fname, input_fname, privatekey_fname, algo, entry_paths,
     image_fname = os.path.abspath(image_fname)
     image = Image.FromFile(image_fname)
 
+    image.mark_build_done()
+
     BeforeReplace(image, allow_resize=True)
 
     for entry_path in entry_paths:

tools/binman/entry.py

@@ -1378,3 +1378,6 @@ features to produce new behaviours.
         if entries:
             for entry in entries.values():
                 entry.mark_build_done()
+
+    def UpdateSignatures(self, privatekey_fname, algo, input_fname):
+        self.Raise('Updating signatures is not supported with this entry type')

tools/binman/etype/fit.py

@@ -847,9 +847,7 @@ class Entry_fit(Entry_section):
         args.append(fname)
 
         if self.mkimage.run_cmd(*args) is None:
-            # Bintool is missing; just use empty data as the output
-            self.record_missing_bintool(self.mkimage)
-            return
+            self.Raise("Missing tool: 'mkimage'")
 
         data = tools.read_file(fname)
         self.WriteData(data)

tools/binman/etype/section.py

@@ -1014,6 +1014,3 @@ class Entry_section(Entry):
             for entry in entries.values():
                 return entry.read_elf_segments()
         return None
-
-    def UpdateSignatures(self, privatekey_fname, algo, input_fname):
-        self.Raise('Updating signatures is not supported with this entry type')

tools/binman/ftest.py

@@ -707,6 +707,14 @@ class TestFunctional(unittest.TestCase):
         AddNode(dtb.GetRoot(), '')
         return tree
 
+    def _CheckSign(self, fit, key):
+        try:
+            tools.run('fit_check_sign', '-k', key, '-f', fit)
+        except:
+            self.fail('Expected signed FIT container')
+            return False
+        return True
+
     def testRun(self):
         """Test a basic run with valid args"""
         result = self._RunBinman('-h')
@@ -6565,6 +6573,91 @@ fdt         fdtmap                Extract the devicetree blob from the fdtmap
         err = stderr.getvalue()
         self.assertRegex(err, "Image 'image'.*missing bintools.*: openssl")
 
+    def _PrepareSignEnv(self, dts='280_fit_sign.dts'):
+        """Prepare sign environment
+
+        Create private and public keys, add pubkey into dtb.
+
+        Returns:
+            Tuple:
+                FIT container
+                Image name
+                Private key
+                DTB
+        """
+
+        data = self._DoReadFileRealDtb(dts)
+        updated_fname = tools.get_output_filename('image-updated.bin')
+        tools.write_file(updated_fname, data)
+        dtb = tools.get_output_filename('source.dtb')
+        private_key = tools.get_output_filename('test_key.key')
+        public_key = tools.get_output_filename('test_key.crt')
+        fit = tools.get_output_filename('fit.fit')
+        key_dir = tools.get_output_dir()
+
+        tools.run('openssl', 'req', '-batch' , '-newkey', 'rsa:4096',
+                  '-sha256', '-new',  '-nodes',  '-x509', '-keyout',
+                  private_key, '-out', public_key)
+        tools.run('fdt_add_pubkey', '-a', 'sha256,rsa4096', '-k', key_dir,
+                  '-n', 'test_key', '-r', 'conf', dtb)
+
+        return fit, updated_fname, private_key, dtb
+
+    def testSignSimple(self):
+        """Test that a FIT container can be signed in image"""
+        is_signed = False
+        fit, fname, private_key, dtb = self._PrepareSignEnv()
+
+        # do sign with private key
+        control.SignEntries(fname, None, private_key, 'sha256,rsa4096',
+                            ['fit'])
+        is_signed = self._CheckSign(fit, dtb)
+
+        self.assertEqual(is_signed, True)
+
+    def testSignExactFIT(self):
+        """Test that a FIT container can be signed and replaced in image"""
+        is_signed = False
+        fit, fname, private_key, dtb = self._PrepareSignEnv()
+
+        # Make sure we propagate the toolpath, since mkimage may not be on PATH
+        args = []
+        if self.toolpath:
+            for path in self.toolpath:
+                args += ['--toolpath', path]
+
+        # do sign with private key
+        self._DoBinman(*args, 'sign', '-i', fname, '-k', private_key, '-a',
+                       'sha256,rsa4096', '-f', fit, 'fit')
+        is_signed = self._CheckSign(fit, dtb)
+
+        self.assertEqual(is_signed, True)
+
+    def testSignNonFit(self):
+        """Test a non-FIT entry cannot be signed"""
+        is_signed = False
+        fit, fname, private_key, _ = self._PrepareSignEnv(
+            '281_sign_non_fit.dts')
+
+        # do sign with private key
+        with self.assertRaises(ValueError) as e:
+            self._DoBinman('sign', '-i', fname, '-k', private_key, '-a',
+                       'sha256,rsa4096', '-f', fit, 'u-boot')
+        self.assertIn(
+            "Node '/u-boot': Updating signatures is not supported with this entry type",
+            str(e.exception))
+
+    def testSignMissingMkimage(self):
+        """Test that FIT signing handles a missing mkimage tool"""
+        fit, fname, private_key, _ = self._PrepareSignEnv()
+
+        # try to sign with a missing mkimage tool
+        bintool.Bintool.set_missing_list(['mkimage'])
+        with self.assertRaises(ValueError) as e:
+            control.SignEntries(fname, None, private_key, 'sha256,rsa4096',
+                                ['fit'])
+        self.assertIn("Node '/fit': Missing tool: 'mkimage'", str(e.exception))
+
 
 if __name__ == "__main__":
     unittest.main()

tools/binman/test/280_fit_sign.dts

@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		size = <0x100000>;
+		allow-repack;
+
+		fit {
+			description = "U-Boot";
+			offset = <0x10000>;
+			images {
+				u-boot-1 {
+					description = "U-Boot";
+					type = "standalone";
+					arch = "arm64";
+					os = "u-boot";
+					compression = "none";
+					hash-1 {
+						algo = "sha256";
+					};
+					u-boot {
+					};
+				};
+
+				fdt-1 {
+					description = "test.dtb";
+					type = "flat_dt";
+					arch = "arm64";
+					compression = "none";
+					hash-1 {
+						algo = "sha256";
+					};
+					u-boot-spl-dtb {
+					};
+				};
+
+			};
+
+			configurations {
+				default = "conf-1";
+				conf-1 {
+					description = "u-boot with fdt";
+					firmware = "u-boot-1";
+					fdt = "fdt-1";
+					signature-1 {
+						algo = "sha256,rsa4096";
+						key-name-hint = "test_key";
+						sign-images = "firmware", "fdt";
+					};
+
+				};
+			};
+		};
+
+		fdtmap {
+		};
+	};
+};

tools/binman/test/281_sign_non_fit.dts

@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		size = <0x100000>;
+		allow-repack;
+
+		u-boot {
+		};
+		fit {
+			description = "U-Boot";
+			offset = <0x10000>;
+			images {
+				u-boot-1 {
+					description = "U-Boot";
+					type = "standalone";
+					arch = "arm64";
+					os = "u-boot";
+					compression = "none";
+					hash-1 {
+						algo = "sha256";
+					};
+					u-boot {
+					};
+				};
+
+				fdt-1 {
+					description = "test.dtb";
+					type = "flat_dt";
+					arch = "arm64";
+					compression = "none";
+					hash-1 {
+						algo = "sha256";
+					};
+					u-boot-spl-dtb {
+					};
+				};
+
+			};
+
+			configurations {
+				default = "conf-1";
+				conf-1 {
+					description = "u-boot with fdt";
+					firmware = "u-boot-1";
+					fdt = "fdt-1";
+					signature-1 {
+						algo = "sha256,rsa4096";
+						key-name-hint = "test_key";
+						sign-images = "firmware", "fdt";
+					};
+
+				};
+			};
+		};
+
+		fdtmap {
+		};
+	};
+};