Merge pull request #45290 from nosan

* pr/45290:
  Trim "\x00" from a decoded Docker Registry password

Closes gh-45290

Author: mhalbritter

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/docker/configuration/DockerConfigurationMetadata.java

@@ -219,11 +219,11 @@ static final class Auth extends MappedObject {
 		Auth(JsonNode node) {
 			super(node, MethodHandles.lookup());
 			String auth = valueAt("/auth", String.class);
-			if (StringUtils.hasText(auth)) {
+			if (StringUtils.hasLength(auth)) {
 				String[] parts = new String(Base64.getDecoder().decode(auth)).split(":", 2);
 				Assert.state(parts.length == 2, "Malformed auth in docker configuration metadata");
 				this.username = parts[0];
-				this.password = parts[1];
+				this.password = trim(parts[1], Character.MIN_VALUE);
 			}
 			else {
 				this.username = valueAt("/username", String.class);
@@ -244,6 +244,11 @@ String getEmail() {
 			return this.email;
 		}
 
+		private static String trim(String source, char character) {
+			source = StringUtils.trimLeadingCharacter(source, character);
+			return StringUtils.trimTrailingCharacter(source, character);
+		}
+
 	}
 
 	static final class DockerContext extends MappedObject {

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/test/java/org/springframework/boot/buildpack/platform/docker/configuration/DockerConfigurationMetadataTests.java

@@ -125,7 +125,7 @@ void configWithAuthIsRead() throws Exception {
 			.containsEntry("gcr.io", "gcr");
 		assertThat(configuration.getAuths()).hasSize(3).hasEntrySatisfying("https://index.docker.io/v1/", (auth) -> {
 			assertThat(auth.getUsername()).isEqualTo("username");
-			assertThat(auth.getPassword()).isEqualTo("password");
+			assertThat(auth.getPassword()).isEqualTo("pass\u0000word");
 			assertThat(auth.getEmail()).isEqualTo("[email protected]");
 		}).hasEntrySatisfying("custom-registry.example.com", (auth) -> {
 			assertThat(auth.getUsername()).isEqualTo("customUser");

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/test/resources/org/springframework/boot/buildpack/platform/docker/configuration/with-auth/config.json

@@ -1,7 +1,7 @@
 {
   "auths": {
     "https://index.docker.io/v1/": {
-      "auth": "dXNlcm5hbWU6cGFzc3dvcmQ=",
+      "auth": "dXNlcm5hbWU6AABwYXNzAHdvcmQAAA==",
       "email": "[email protected]"
     },
     "custom-registry.example.com": {