import sun.security.provider.PolicyFile; //导入依赖的package包/类
/**
 * Prints warning message if installed Policy is the default Policy
 * implementation and globally granted permissions do not include
 * AllPermission or any ExecPermissions/ExecOptionPermissions.
 */
static void checkConfiguration() {
    Policy policy =
        AccessController.doPrivileged(new PrivilegedAction<Policy>() {
            public Policy run() {
                return Policy.getPolicy();
            }
        });
    if (!(policy instanceof PolicyFile)) {
        return;
    }
    PermissionCollection perms = getExecPermissions();
    for (Enumeration<Permission> e = perms.elements();
         e.hasMoreElements();)
    {
        Permission p = e.nextElement();
        if (p instanceof AllPermission ||
            p instanceof ExecPermission ||
            p instanceof ExecOptionPermission)
        {
            return;
        }
    }
    System.err.println(getTextResource("rmid.exec.perms.inadequate"));
}
 

import sun.security.provider.PolicyFile; //导入依赖的package包/类
private static int doBadTest(PolicyFile policy, int testnum) {

        // this principal is not in policy - should not match any policy grants
        ProtectionDomain pd = new ProtectionDomain(cs, null, null, badP);
        if (policy.implies(pd, FOO)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        // this principal is not in policy - should not match any policy grants
        if (policy.implies(pd, BAR)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        // this principal is not in policy - should not match any policy grants
        if (policy.implies(pd, FOOBAR)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        return testnum;
    }
 

import sun.security.provider.PolicyFile; //导入依赖的package包/类
private static int doPrincipalTest(PolicyFile policy, int testnum) {

        // security check against one principal should pass
        ProtectionDomain pd = new ProtectionDomain(cs, null, null, p1);
        if (!policy.implies(pd, FOO)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        // should not match BAR grant entry in policy
        pd = new ProtectionDomain(cs, null, null, p1);
        if (policy.implies(pd, BAR)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        // security check against two principals should pass
        pd = new ProtectionDomain(cs, null, null, p2);
        if (!policy.implies(pd, BAR)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        // should not match FOOBAR grant entry in policy
        pd = new ProtectionDomain(cs, null, null, p1);
        if (policy.implies(pd, FOOBAR)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        // should not match FOOBAR grant entry in policy
        pd = new ProtectionDomain(cs, null, null, p2);
        if (policy.implies(pd, FOOBAR)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        testnum = doBadTest(policy, testnum);

        return testnum;
    }
 

import sun.security.provider.PolicyFile; //导入依赖的package包/类
private static int doComparatorTest(PolicyFile policy, int testnum) {

        // security check against one comparator should pass
        ProtectionDomain pd = new ProtectionDomain(cs, null, null, p1);
        if (!policy.implies(pd, FOO)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        // should not match BAR grant entry in policy
        pd = new ProtectionDomain(cs, null, null, p1);
        if (policy.implies(pd, BAR)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        // security check against two comparators should pass for FOO
        pd = new ProtectionDomain(cs, null, null, p3);
        if (!policy.implies(pd, FOO)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        // security check against two comparators should pass for BAR
        pd = new ProtectionDomain(cs, null, null, p3);
        if (!policy.implies(pd, BAR)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        // security check should fail against FOOBAR
        pd = new ProtectionDomain(cs, null, null, p3);
        if (policy.implies(pd, FOOBAR)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        testnum = doBadTest(policy, testnum);

        return testnum;
    }
 

import sun.security.provider.PolicyFile; //导入依赖的package包/类
private static int doCombinedTest(PolicyFile policy, int testnum) {

        // security check against principal followed by comparator should pass
        ProtectionDomain pd = new ProtectionDomain(cs, null, null, p3);
        if (!policy.implies(pd, FOO)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        // should not match BAR grant entry in policy
        pd = new ProtectionDomain(cs, null, null, p3);
        if (policy.implies(pd, BAR)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        // security check against comparator followed by principal should pass
        pd = new ProtectionDomain(cs, null, null, p4);
        if (!policy.implies(pd, BAR)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        // should not match FOO grant entry in policy
        pd = new ProtectionDomain(cs, null, null, p4);
        if (policy.implies(pd, FOO)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        // security check against principal-principal-comparator should pass
        pd = new ProtectionDomain(cs, null, null, p5);
        if (!policy.implies(pd, HELLO)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        // should not match WORLD grant entry in policy
        pd = new ProtectionDomain(cs, null, null, p5);
        if (policy.implies(pd, WORLD)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        // security check against principal-principal-comparator should pass
        pd = new ProtectionDomain(cs, null, null, p6);
        if (!policy.implies(pd, WORLD)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        // should not match HELLO grant entry in policy
        pd = new ProtectionDomain(cs, null, null, p6);
        if (policy.implies(pd, HELLO)) {
            throw new SecurityException("test." + testnum + " failed");
        }
        testnum++;

        testnum = doBadTest(policy, testnum);

        return testnum;
    }
 

import sun.security.provider.PolicyFile; //导入依赖的package包/类
/**
 * This method has almost the same logic flow as {@link #implies} but
 * it ensures some level of FilePermission compatibility after JDK-8164705.
 *
 * This method is called by {@link AccessControlContext#checkPermission}
 * and not intended to be called by an application.
 */
boolean impliesWithAltFilePerm(Permission perm) {

    // If FilePermCompat.compat is set (default value), FilePermission
    // checking compatibility should be considered.

    // If filePermCompatInPD is set, this method checks for alternative
    // FilePermission to keep compatibility for any Policy implementation.
    // When set to false (default value), implies() is called since
    // the PolicyFile implementation already supports compatibility.

    // If this is a subclass of ProtectionDomain, call implies()
    // because most likely user has overridden it.

    if (!filePermCompatInPD || !FilePermCompat.compat ||
            getClass() != ProtectionDomain.class) {
        return implies(perm);
    }

    if (hasAllPerm) {
        // internal permission collection already has AllPermission -
        // no need to go to policy
        return true;
    }

    Permission p2 = null;
    boolean p2Calculated = false;

    if (!staticPermissions) {
        Policy policy = Policy.getPolicyNoCheck();
        if (policy instanceof PolicyFile) {
            // The PolicyFile implementation supports compatibility
            // inside and it also covers the static permissions.
            return policy.implies(this, perm);
        } else {
            if (policy.implies(this, perm)) {
                return true;
            }
            p2 = FilePermCompat.newPermUsingAltPath(perm);
            p2Calculated = true;
            if (p2 != null && policy.implies(this, p2)) {
                return true;
            }
        }
    }
    if (permissions != null) {
        if (permissions.implies(perm)) {
            return true;
        } else {
            if (!p2Calculated) {
                p2 = FilePermCompat.newPermUsingAltPath(perm);
            }
            if (p2 != null) {
                return permissions.implies(p2);
            }
        }
    }
    return false;
}