├── .gitignore ├── Jenkinsfile ├── LICENSE ├── README.md ├── build.gradle ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat ├── settings.gradle └── src ├── main └── java │ ├── cpw │ └── mods │ │ └── gross │ │ ├── Java9ClassLoaderUtil.java │ │ └── SecureJarVerifier.java │ └── module-info.java └── test └── java └── cpw └── mods └── gross └── test └── Java9ClassLoaderUtilTest.java /.gitignore: -------------------------------------------------------------------------------- 1 | 2 | /.gradle/ 3 | /build/ 4 | /.idea/ 5 | /out/ 6 | /forge-1.16.5-36.1.16.jar 7 | -------------------------------------------------------------------------------- /Jenkinsfile: -------------------------------------------------------------------------------- 1 | library 'forge-shared-library' 2 | 3 | pipeline { 4 | agent { 5 | docker { 6 | image 'gradle:7-jdk16' 7 | args '-v grossjava9hacksgc:/home/gradle/.gradle/' 8 | } 9 | } 10 | environment { 11 | GRADLE_ARGS = '--no-daemon' 12 | } 13 | 14 | stages { 15 | stage('buildandtest') { 16 | steps { 17 | withGradle { 18 | sh './gradlew ${GRADLE_ARGS} --refresh-dependencies --continue build test' 19 | gradleVersion(this, 'properties', 'MYVERSION') 20 | } 21 | } 22 | post { 23 | success { 24 | writeChangelog(currentBuild, 'build/changelog.txt') 25 | archiveArtifacts artifacts: 'build/changelog.txt', fingerprint: false 26 | } 27 | } 28 | } 29 | stage('publish') { 30 | when { 31 | not { 32 | changeRequest() 33 | } 34 | } 35 | steps { 36 | withCredentials([usernamePassword(credentialsId: 'maven-cpw-user', usernameVariable: 'MAVEN_USER', passwordVariable: 'MAVEN_PASSWORD')]) { 37 | withGradle { 38 | sh './gradlew ${GRADLE_ARGS} publish' 39 | } 40 | } 41 | } 42 | post { 43 | success { 44 | build job: 'filegenerator', parameters: [string(name: 'COMMAND', value: "promote cpw.mods:grossjava9hacks ${env.MYVERSION} latest")], propagate: false, wait: false 45 | } 46 | } 47 | } 48 | } 49 | post { 50 | always { 51 | archiveArtifacts artifacts: 'build/libs/**/*.jar', fingerprint: true 52 | junit 'build/test-results/*/*.xml' 53 | } 54 | } 55 | } -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Copyright 2019 cpw 2 | 3 | Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: 4 | 5 | The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. 6 | 7 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Java 9 Hacks 2 | 3 | Java 9 hacks that rely on some nasty mechanisms to work. Separated for keeping referring projects clean. 4 | 5 | MIT license, cos everyone should be able to use this. So gross. 6 | 7 | Current hacks: 8 | 1. Get URLs from system classloader. Original at stack overflow, of course: https://stackoverflow.com/a/46709196 9 | 10 | 11 | ## Testing 12 | 13 | Run the testsuite with a variety of Java versions. I recommend Java 8 and 10 for best compatibility. 14 | 15 | ## Distribution 16 | 17 | The distribution is build with Java 8 because it is maximally compatible. -------------------------------------------------------------------------------- /build.gradle: -------------------------------------------------------------------------------- 1 | plugins { 2 | id 'org.ajoberstar.grgit' version '4.1.0' 3 | id 'com.github.ben-manes.versions' version '0.38.0' 4 | id 'org.javamodularity.moduleplugin' version '1.8.3' apply false 5 | } 6 | 7 | apply plugin: 'java-library' 8 | apply plugin: 'maven-publish' 9 | apply plugin: 'eclipse' 10 | apply plugin: 'org.javamodularity.moduleplugin' 11 | 12 | 13 | repositories { 14 | mavenCentral() 15 | } 16 | 17 | def isNonStable = { String version -> 18 | def stableKeyword = ['RELEASE', 'FINAL', 'GA'].any { it -> version.toUpperCase().contains(it) } 19 | def regex = /^[0-9,.v-]+(-r)?$/ 20 | return !stableKeyword && !(version ==~ regex) 21 | } 22 | 23 | dependencyUpdates { 24 | rejectVersionIf { 25 | isNonStable(it.candidate.version) 26 | } 27 | } 28 | 29 | test { 30 | useJUnitPlatform() 31 | } 32 | 33 | group = 'cpw.mods' 34 | 35 | version = grgit.describe(longDescr: true).split('-').with { "${it[0]}.${it[1]}" } 36 | 37 | dependencies { 38 | implementation("org.apache.logging.log4j:log4j-api:2.14.1") 39 | implementation("org.apache.logging.log4j:log4j-core:2.14.1") 40 | testImplementation("org.powermock:powermock-core:2.0.+") 41 | testImplementation("org.junit.jupiter:junit-jupiter-api:5.7.+") 42 | testImplementation("org.junit.jupiter:junit-jupiter-engine:5.7.+") 43 | } 44 | 45 | task sourcesJar(type: Jar) { 46 | archiveClassifier = 'sources' 47 | from sourceSets.main.allSource 48 | } 49 | 50 | tasks.withType(JavaCompile) { 51 | options.compilerArgs << '-Xlint:unchecked' 52 | moduleOptions { 53 | addExports = ['java.base/sun.security.util': 'cpw.mods.grossjava9hacks'] 54 | } 55 | } 56 | 57 | jar { 58 | manifest { 59 | attributes([ 60 | 'Specification-Title': 'grossjava9hacks', 61 | 'Specification-Vendor': 'forge', 62 | 'Specification-Version': '1', // We are version 1 of ourselves 63 | 'Implementation-Title': project.name, 64 | 'Implementation-Version': "${project.version}+${System.getenv("BUILD_NUMBER")?:0}+${grgit.branch.current().getName()}.${grgit.head().abbreviatedId}", 65 | 'Implementation-Vendor':'forge', 66 | 'Implementation-Timestamp': java.time.Instant.now().toString(), 67 | 'Git-Commit': grgit.head().abbreviatedId, 68 | 'Git-Branch': grgit.branch.current().getName(), 69 | 'Build-Number': "${System.getenv("BUILD_NUMBER")?:0}", 70 | ]) 71 | } 72 | } 73 | 74 | artifacts { 75 | archives jar 76 | archives sourcesJar 77 | } 78 | 79 | publishing { 80 | publications { 81 | mavenJava(MavenPublication) { 82 | from components.java 83 | artifact sourcesJar 84 | pom { 85 | name = 'Grotesque Java 9 Hacks' 86 | description = 'Grotesque Java 9 Hacks to allow modlauncher to function' 87 | url = 'https://github.com/cpw/grossjava9classpathhacks' 88 | scm { 89 | url = 'https://github.com/cpw/grossjava9classpathhacks' 90 | connection = 'scm:git:git://github.com/cpw/grossjava9classpathhacks.git' 91 | developerConnection = 'scm:git:git@github.com:cpw/grossjava9classpathhacks.git' 92 | } 93 | issueManagement { 94 | system = 'github' 95 | url = 'https://github.com/cpw/grossjava9classpathhacks/issues' 96 | } 97 | 98 | developers { 99 | developer { 100 | id = 'cpw' 101 | name = 'cpw' 102 | } 103 | } 104 | } 105 | } 106 | } 107 | repositories { 108 | maven { 109 | authentication { 110 | basic(BasicAuthentication) 111 | } 112 | credentials { 113 | username = System.env.MAVEN_USER ?: 'not' 114 | password = System.env.MAVEN_PASSWORD ?: 'set' 115 | } 116 | url 'https://maven.minecraftforge.net/releases' 117 | } 118 | } 119 | } -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/cpw/grossjava9hacks/243466649514fe7b3032f493b60f5417a1816f65/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | distributionBase=GRADLE_USER_HOME 2 | distributionPath=wrapper/dists 3 | distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-bin.zip 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env sh 2 | 3 | # 4 | # Copyright 2015 the original author or authors. 5 | # 6 | # Licensed under the Apache License, Version 2.0 (the "License"); 7 | # you may not use this file except in compliance with the License. 8 | # You may obtain a copy of the License at 9 | # 10 | # https://www.apache.org/licenses/LICENSE-2.0 11 | # 12 | # Unless required by applicable law or agreed to in writing, software 13 | # distributed under the License is distributed on an "AS IS" BASIS, 14 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 | # See the License for the specific language governing permissions and 16 | # limitations under the License. 17 | # 18 | 19 | ############################################################################## 20 | ## 21 | ## Gradle start up script for UN*X 22 | ## 23 | ############################################################################## 24 | 25 | # Attempt to set APP_HOME 26 | # Resolve links: $0 may be a link 27 | PRG="$0" 28 | # Need this for relative symlinks. 29 | while [ -h "$PRG" ] ; do 30 | ls=`ls -ld "$PRG"` 31 | link=`expr "$ls" : '.*-> \(.*\)$'` 32 | if expr "$link" : '/.*' > /dev/null; then 33 | PRG="$link" 34 | else 35 | PRG=`dirname "$PRG"`"/$link" 36 | fi 37 | done 38 | SAVED="`pwd`" 39 | cd "`dirname \"$PRG\"`/" >/dev/null 40 | APP_HOME="`pwd -P`" 41 | cd "$SAVED" >/dev/null 42 | 43 | APP_NAME="Gradle" 44 | APP_BASE_NAME=`basename "$0"` 45 | 46 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 47 | DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' 48 | 49 | # Use the maximum available, or set MAX_FD != -1 to use that value. 50 | MAX_FD="maximum" 51 | 52 | warn () { 53 | echo "$*" 54 | } 55 | 56 | die () { 57 | echo 58 | echo "$*" 59 | echo 60 | exit 1 61 | } 62 | 63 | # OS specific support (must be 'true' or 'false'). 64 | cygwin=false 65 | msys=false 66 | darwin=false 67 | nonstop=false 68 | case "`uname`" in 69 | CYGWIN* ) 70 | cygwin=true 71 | ;; 72 | Darwin* ) 73 | darwin=true 74 | ;; 75 | MINGW* ) 76 | msys=true 77 | ;; 78 | NONSTOP* ) 79 | nonstop=true 80 | ;; 81 | esac 82 | 83 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 84 | 85 | 86 | # Determine the Java command to use to start the JVM. 87 | if [ -n "$JAVA_HOME" ] ; then 88 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 89 | # IBM's JDK on AIX uses strange locations for the executables 90 | JAVACMD="$JAVA_HOME/jre/sh/java" 91 | else 92 | JAVACMD="$JAVA_HOME/bin/java" 93 | fi 94 | if [ ! -x "$JAVACMD" ] ; then 95 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 96 | 97 | Please set the JAVA_HOME variable in your environment to match the 98 | location of your Java installation." 99 | fi 100 | else 101 | JAVACMD="java" 102 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 103 | 104 | Please set the JAVA_HOME variable in your environment to match the 105 | location of your Java installation." 106 | fi 107 | 108 | # Increase the maximum file descriptors if we can. 109 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then 110 | MAX_FD_LIMIT=`ulimit -H -n` 111 | if [ $? -eq 0 ] ; then 112 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 113 | MAX_FD="$MAX_FD_LIMIT" 114 | fi 115 | ulimit -n $MAX_FD 116 | if [ $? -ne 0 ] ; then 117 | warn "Could not set maximum file descriptor limit: $MAX_FD" 118 | fi 119 | else 120 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 121 | fi 122 | fi 123 | 124 | # For Darwin, add options to specify how the application appears in the dock 125 | if $darwin; then 126 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 127 | fi 128 | 129 | # For Cygwin or MSYS, switch paths to Windows format before running java 130 | if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then 131 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 132 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 133 | 134 | JAVACMD=`cygpath --unix "$JAVACMD"` 135 | 136 | # We build the pattern for arguments to be converted via cygpath 137 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 138 | SEP="" 139 | for dir in $ROOTDIRSRAW ; do 140 | ROOTDIRS="$ROOTDIRS$SEP$dir" 141 | SEP="|" 142 | done 143 | OURCYGPATTERN="(^($ROOTDIRS))" 144 | # Add a user-defined pattern to the cygpath arguments 145 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 146 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 147 | fi 148 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 149 | i=0 150 | for arg in "$@" ; do 151 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 152 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 153 | 154 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 155 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 156 | else 157 | eval `echo args$i`="\"$arg\"" 158 | fi 159 | i=`expr $i + 1` 160 | done 161 | case $i in 162 | 0) set -- ;; 163 | 1) set -- "$args0" ;; 164 | 2) set -- "$args0" "$args1" ;; 165 | 3) set -- "$args0" "$args1" "$args2" ;; 166 | 4) set -- "$args0" "$args1" "$args2" "$args3" ;; 167 | 5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 168 | 6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 169 | 7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 170 | 8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 171 | 9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 172 | esac 173 | fi 174 | 175 | # Escape application args 176 | save () { 177 | for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done 178 | echo " " 179 | } 180 | APP_ARGS=`save "$@"` 181 | 182 | # Collect all arguments for the java command, following the shell quoting and substitution rules 183 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS" 184 | 185 | exec "$JAVACMD" "$@" 186 | -------------------------------------------------------------------------------- /gradlew.bat: -------------------------------------------------------------------------------- 1 | @rem 2 | @rem Copyright 2015 the original author or authors. 3 | @rem 4 | @rem Licensed under the Apache License, Version 2.0 (the "License"); 5 | @rem you may not use this file except in compliance with the License. 6 | @rem You may obtain a copy of the License at 7 | @rem 8 | @rem https://www.apache.org/licenses/LICENSE-2.0 9 | @rem 10 | @rem Unless required by applicable law or agreed to in writing, software 11 | @rem distributed under the License is distributed on an "AS IS" BASIS, 12 | @rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | @rem See the License for the specific language governing permissions and 14 | @rem limitations under the License. 15 | @rem 16 | 17 | @if "%DEBUG%" == "" @echo off 18 | @rem ########################################################################## 19 | @rem 20 | @rem Gradle startup script for Windows 21 | @rem 22 | @rem ########################################################################## 23 | 24 | @rem Set local scope for the variables with windows NT shell 25 | if "%OS%"=="Windows_NT" setlocal 26 | 27 | set DIRNAME=%~dp0 28 | if "%DIRNAME%" == "" set DIRNAME=. 29 | set APP_BASE_NAME=%~n0 30 | set APP_HOME=%DIRNAME% 31 | 32 | @rem Resolve any "." and ".." in APP_HOME to make it shorter. 33 | for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi 34 | 35 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 36 | set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m" 37 | 38 | @rem Find java.exe 39 | if defined JAVA_HOME goto findJavaFromJavaHome 40 | 41 | set JAVA_EXE=java.exe 42 | %JAVA_EXE% -version >NUL 2>&1 43 | if "%ERRORLEVEL%" == "0" goto execute 44 | 45 | echo. 46 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 47 | echo. 48 | echo Please set the JAVA_HOME variable in your environment to match the 49 | echo location of your Java installation. 50 | 51 | goto fail 52 | 53 | :findJavaFromJavaHome 54 | set JAVA_HOME=%JAVA_HOME:"=% 55 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 56 | 57 | if exist "%JAVA_EXE%" goto execute 58 | 59 | echo. 60 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 61 | echo. 62 | echo Please set the JAVA_HOME variable in your environment to match the 63 | echo location of your Java installation. 64 | 65 | goto fail 66 | 67 | :execute 68 | @rem Setup the command line 69 | 70 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 71 | 72 | 73 | @rem Execute Gradle 74 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %* 75 | 76 | :end 77 | @rem End local scope for the variables with windows NT shell 78 | if "%ERRORLEVEL%"=="0" goto mainEnd 79 | 80 | :fail 81 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 82 | rem the _cmd.exe /c_ return code! 83 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 84 | exit /b 1 85 | 86 | :mainEnd 87 | if "%OS%"=="Windows_NT" endlocal 88 | 89 | :omega 90 | -------------------------------------------------------------------------------- /settings.gradle: -------------------------------------------------------------------------------- 1 | rootProject.name = 'grossjava9hacks' 2 | 3 | -------------------------------------------------------------------------------- /src/main/java/cpw/mods/gross/Java9ClassLoaderUtil.java: -------------------------------------------------------------------------------- 1 | package cpw.mods.gross; 2 | 3 | import sun.misc.Unsafe; 4 | 5 | import java.lang.reflect.Field; 6 | import java.net.URL; 7 | import java.net.URLClassLoader; 8 | import java.util.ArrayList; 9 | 10 | /** 11 | * Literally from https://stackoverflow.com/questions/46519092/how-to-get-all-jars-loaded-by-a-java-application-in-java9 12 | */ 13 | public class Java9ClassLoaderUtil { 14 | @SuppressWarnings({"restriction", "unchecked"}) 15 | public static URL[] getSystemClassPathURLs() { 16 | ClassLoader classLoader = Java9ClassLoaderUtil.class.getClassLoader(); 17 | if (classLoader instanceof URLClassLoader) { 18 | return ((URLClassLoader) classLoader).getURLs(); 19 | } 20 | 21 | if (classLoader.getClass().getName().startsWith("jdk.internal.loader.ClassLoaders$")) { 22 | try { 23 | Field field = Unsafe.class.getDeclaredField("theUnsafe"); 24 | field.setAccessible(true); 25 | Unsafe unsafe = (Unsafe) field.get(null); 26 | 27 | // jdk.internal.loader.ClassLoaders.AppClassLoader.ucp 28 | Field ucpField = null; 29 | try { 30 | ucpField = classLoader.getClass().getDeclaredField("ucp"); 31 | } catch (NoSuchFieldException | SecurityException e) { 32 | ucpField = classLoader.getClass().getSuperclass().getDeclaredField("ucp"); 33 | } 34 | 35 | long ucpFieldOffset = unsafe.objectFieldOffset(ucpField); 36 | Object ucpObject = unsafe.getObject(classLoader, ucpFieldOffset); 37 | 38 | // jdk.internal.loader.URLClassPath.path 39 | Field pathField = ucpField.getType().getDeclaredField("path"); 40 | long pathFieldOffset = unsafe.objectFieldOffset(pathField); 41 | ArrayList path = (ArrayList) unsafe.getObject(ucpObject, pathFieldOffset); 42 | 43 | return path.toArray(new URL[0]); 44 | } catch (Throwable e) { 45 | throw new RuntimeException("Failed to find system class path URLs. Incompatible JDK?", e); 46 | } 47 | } 48 | return null; 49 | } 50 | } 51 | -------------------------------------------------------------------------------- /src/main/java/cpw/mods/gross/SecureJarVerifier.java: -------------------------------------------------------------------------------- 1 | package cpw.mods.gross; 2 | 3 | import java.io.IOException; 4 | import java.io.UncheckedIOException; 5 | import java.lang.reflect.Field; 6 | import java.security.CodeSigner; 7 | import java.util.Hashtable; 8 | import java.util.jar.JarFile; 9 | import java.util.jar.Manifest; 10 | 11 | import sun.security.util.ManifestEntryVerifier; 12 | 13 | public class SecureJarVerifier { 14 | 15 | private static final Field jarVerifier; 16 | private static final Field sigFileSigners; 17 | 18 | public static class SecureJar { 19 | private final Manifest manifest; 20 | private final ManifestEntryVerifier mev; 21 | private final Hashtable pendingSigners; 22 | private final Hashtable existingSigners; 23 | 24 | @SuppressWarnings("unchecked") 25 | public SecureJar(final JarFile jarFile) { 26 | try { 27 | // Force the manifest to be parsed by the jarfile 28 | jarFile.getInputStream(jarFile.entries().nextElement()).readAllBytes(); 29 | this.manifest = new Manifest(jarFile.getManifest()); 30 | this.mev = new ManifestEntryVerifier(this.manifest); 31 | pendingSigners = new Hashtable<>((Hashtable) sigFileSigners.get(jarVerifier.get(this.manifest))); 32 | } catch (IllegalAccessException | IOException e) { 33 | throw new RuntimeException(e); 34 | } 35 | existingSigners = new Hashtable<>(); 36 | existingSigners.put(JarFile.MANIFEST_NAME, jarFile.getJarEntry(JarFile.MANIFEST_NAME).getCodeSigners()); 37 | } 38 | 39 | public Manifest getManifest() { 40 | return manifest; 41 | } 42 | 43 | public synchronized CodeSigner[] computeSigners(final String name, final byte[] bytes) { 44 | try { 45 | mev.setEntry(name, null); 46 | mev.update(bytes, 0, bytes.length); 47 | final var codeSigners = mev.verify(existingSigners, pendingSigners); 48 | mev.setEntry(null, null); 49 | return codeSigners; 50 | } catch (IOException e) { 51 | // return null? 52 | throw new UncheckedIOException(e); 53 | } 54 | } 55 | } 56 | 57 | static { 58 | final var moduleLayer = ModuleLayer.boot(); 59 | final var gj9h = moduleLayer.findModule("cpw.mods.grossjava9hacks").orElseThrow(); 60 | moduleLayer.findModule("java.base").filter(m-> m.isOpen("java.util.jar", gj9h) && m.isExported("sun.security.util", gj9h)).orElseThrow(()->new IllegalStateException(""" 61 | Missing JVM arguments. Please correct your runtime profile and run again. 62 | --add-opens java.base/java.util.jar=cpw.mods.grossjava9hacks 63 | --add-exports java.base/sun.security.util=cpw.mods.grossjava9hacks""")); 64 | try { 65 | jarVerifier = Manifest.class.getDeclaredField("jv"); 66 | sigFileSigners = jarVerifier.getType().getDeclaredField("sigFileSigners"); 67 | jarVerifier.setAccessible(true); 68 | sigFileSigners.setAccessible(true); 69 | } catch (NoSuchFieldException e) { 70 | throw new IllegalStateException("Missing essential fields", e); 71 | } 72 | } 73 | 74 | public static SecureJar from(final JarFile jarFile) { 75 | return new SecureJar(jarFile); 76 | } 77 | } 78 | -------------------------------------------------------------------------------- /src/main/java/module-info.java: -------------------------------------------------------------------------------- 1 | module cpw.mods.grossjava9hacks { 2 | exports cpw.mods.gross; 3 | requires jdk.unsupported; 4 | } -------------------------------------------------------------------------------- /src/test/java/cpw/mods/gross/test/Java9ClassLoaderUtilTest.java: -------------------------------------------------------------------------------- 1 | package cpw.mods.gross.test; 2 | 3 | import cpw.mods.gross.Java9ClassLoaderUtil; 4 | import org.junit.jupiter.api.Test; 5 | 6 | import java.net.URL; 7 | 8 | import static org.junit.jupiter.api.Assertions.*; 9 | 10 | class Java9ClassLoaderUtilTest { 11 | @Test 12 | void getSystemClassPathURLs() { 13 | final URL[] systemClassPathURLs = Java9ClassLoaderUtil.getSystemClassPathURLs(); 14 | assertNotNull(systemClassPathURLs); 15 | assertTrue(systemClassPathURLs.length>0); 16 | } 17 | } --------------------------------------------------------------------------------