56 WEB DB PRESS Vol.4
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1 WEB DB PRESS Vol.4
2 q w import java.io.*; public class Test extends java.applet.applet { public void start() { System.out.println( System.getProperty("user.home") + ":"); String[] files = new File( System.getProperty("user.home")).list(); for (int i = 0; i < files.length; i++) { System.out.println("\t" + files[i]); if (i >= 5) break; public static void main(string[] args) { new Test().start(); <applet code="test" width="200" height="200"> </applet> % javac Test.java % appletviewer test.html java.security.accesscontrolexception: access denied (java.util.propertypermission user.home read) at java.security.accesscontrolcontext.checkpermission (AccessControlContext.java:272) at java.security.accesscontroller.checkpermission (AccessController.java:399) at java.lang.securitymanager.checkpermission (SecurityManager.java:545) at java.lang.securitymanager.checkpropertyaccess (SecurityManager.java:1278) at java.lang.system.getproperty(system.java:560) at Test.start(Test.java:5) at sun.applet.appletpanel.run(appletpanel.java:358) at java.lang.thread.run(thread.java:484) WEB DB PRESS Vol.4 57
3 % java Test C: WINDOWS: COMMAND OPTIONS SYSTEM ADDLFNPR.REG DOSSTART.BAT MSDOS.SYS % appletviewer test.html C: WINDOWS: java.security.accesscontrolexception: access denied (java.io.filepermission C: WINDOWS read) at java.security.accesscontrolcontext.checkpermission (AccessControlContext.java:272) at java.security.accesscontroller.checkpermission (AccessController.java:399) at java.lang.securitymanager.checkpermission (SecurityManager.java:545) at java.lang.securitymanager.checkread (SecurityManager.java:890) at java.io.file.list(file.java:772) at Test.start(Test.java:7) at sun.applet.appletpanel.run(appletpanel.java:358) at java.lang.thread.run(thread.java:484) grant codebase "file:/-" { permission java.util.propertypermission "user.home", "read"; ; grant codebase "file:/-" { permission java.util.propertypermission "user.home", "read"; permission java.io.filepermission "<<ALL FILES>>", "read"; ; % appletviewer test.html C: WINDOWS: COMMAND OPTIONS SYSTEM ADDLFNPR.REG DOSSTART.BAT MSDOS.SYS q w qw 58 WEB DB PRESS Vol.4
4 q w e r t y u i WEB DB PRESS Vol.4 59
5 public class Test2 extends java.applet.applet { private void checkpermission(class clazz) { System.out.println(clazz.getName() + ":"); System.out.print(clazz.getProtectionDomain()); System.out.print(clazz.getName() + " "); if (clazz.getprotectiondomain().implies( new java.io.filepermission( "<<ALL FILES>>", "read"))) System.out.println("has"); else System.out.println("does not have"); System.out.println("\t" + "java.io.filepermission(" + "\"<<ALL FILES>>\", \"read\")"); System.out.println(); i = n; while (i > 0) { if (domain i does not have permission) throw AccessControllExcepion; else if (domain i is privileged) return; i = i - 1; return; public void start() { checkpermission( java.security.accesscontrolcontext.class); checkpermission(java.security.accesscontroller.class); checkpermission(java.lang.securitymanager.class); checkpermission(java.io.file.class); checkpermission(test.class); checkpermission(sun.applet.appletpanel.class); checkpermission(java.lang.thread.class); public static void main(string[] args) { new Test2().start(); qw q 60 WEB DB PRESS Vol.4
6 % javac Test2.java % java Test2 java.io.file: ProtectionDomain null java.security.permissions@6b97fd ( (java.security.allpermission <all permissions> <all actions>) ) java.io.file has java.io.filepermission("<<all FILES>>", "read") Test: ProtectionDomain (file:/c:/my Documents/ <no certificates>) java.security.permissions@2d086a ( (java.net.socketpermission localhost:1024- listen,resolve) (java.io.filepermission C: My Documents - read) (java.lang.runtimepermission exitvm) (java.lang.runtimepermission stopthread) (java.util.propertypermission java.vendor read) (java.util.propertypermission java.specification.version read) (java.util.propertypermission line.separator read) (java.util.propertypermission java.class.version read) (java.util.propertypermission java.specification.name read) (java.util.propertypermission java.vendor.url read) (java.util.propertypermission java.vm.version read) (java.util.propertypermission os.name read) (java.util.propertypermission os.arch read) (java.util.propertypermission os.version read) (java.util.propertypermission java.version read) (java.util.propertypermission java.vm.specification.version read) (java.util.propertypermission java.vm.specification.name read) (java.util.propertypermission java.specification.vendor read) (java.util.propertypermission java.vm.vendor read) (java.util.propertypermission file.separator read) (java.util.propertypermission path.separator read) (java.util.propertypermission java.vm.name read) (java.util.propertypermission java.vm.specification.vendor read) ) Test does not have java.io.filepermission("<<all FILES>>", "read") % java -Djava.security.manager Test Exception in thread "main" java.security.accesscontrolexception: access denied (java.util.propertypermission user.home read) at java.security.accesscontrolcontext.checkpermission (AccessControlContext.java:272) at java.security.accesscontroller.checkpermission (AccessController.java:399) at java.lang.securitymanager.checkpermission (SecurityManager.java:545) at java.lang.securitymanager.checkpropertyaccess (SecurityManager.java:1278) at java.lang.system.getproperty(system.java:560) at Test.start(Test.java:5) at Test.main(Test.java:17) WEB DB PRESS Vol.4 61
7 q w e r t y u i o COLUMN 62 WEB DB PRESS Vol.4
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