1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
/*******************************************************************************
* Copyright (c) 2008, 2010 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.internal.permadmin;
import java.security.Permission;
import java.security.PermissionCollection;
import java.util.Enumeration;
import org.eclipse.osgi.internal.permadmin.SecurityRow.Decision;
public class SecurityTable extends PermissionCollection {
private static final long serialVersionUID = -1800193310096318060L;
static final int GRANTED = 0x0001;
static final int DENIED = 0x0002;
static final int ABSTAIN = 0x0004;
static final int POSTPONED = 0x0008;
private final SecurityRow[] rows;
private final SecurityAdmin securityAdmin;
public SecurityTable(SecurityAdmin securityAdmin, SecurityRow[] rows) {
if (rows == null)
throw new NullPointerException("rows cannot be null!!"); //$NON-NLS-1$
this.rows = rows;
this.securityAdmin = securityAdmin;
}
boolean isEmpty() {
return rows.length == 0;
}
int evaluate(BundlePermissions bundlePermissions, Permission permission) {
if (isEmpty())
return ABSTAIN;
boolean postponed = false;
Decision[] results = new Decision[rows.length];
int immediateDecisionIdx = -1;
// evaluate each row
for (int i = 0; i < rows.length; i++) {
try {
results[i] = rows[i].evaluate(bundlePermissions, permission);
} catch (Throwable t) {
// TODO log?
results[i] = SecurityRow.DECISION_ABSTAIN;
}
if ((results[i].decision & ABSTAIN) != 0)
continue; // ignore this row and continue to next row
if ((results[i].decision & POSTPONED) != 0) {
// row is postponed; we can no longer return quickly on a denied decision
postponed = true;
continue; // continue to next row
}
if (!postponed)
// no postpones encountered yet; we can return the decision quickly
return results[i].decision; // return GRANTED or DENIED
// got an immediate answer; but it is after a postponed condition.
// no need to process the rest of the rows
immediateDecisionIdx = i;
break;
}
if (postponed) {
int immediateDecision = immediateDecisionIdx < 0 ? DENIED : results[immediateDecisionIdx].decision;
// iterate over all postponed conditions;
// if they all provide the same decision as the immediate decision then return the immediate decision
boolean allSameDecision = true;
int i = immediateDecisionIdx < 0 ? results.length - 1 : immediateDecisionIdx - 1;
for (; i >= 0 && allSameDecision; i--) {
if (results[i] == null)
continue;
if ((results[i].decision & POSTPONED) != 0) {
if ((results[i].decision & immediateDecision) == 0)
allSameDecision = false;
else
results[i] = SecurityRow.DECISION_ABSTAIN; // we can clear postpones with the same decision as the immediate
}
}
if (allSameDecision)
return immediateDecision;
// we now are forced to postpone; we need to also remember the postponed decisions and
// the immediate decision if there is one.
EquinoxSecurityManager equinoxManager = securityAdmin.getSupportedSecurityManager();
if (equinoxManager == null)
// TODO this is really an error condition.
// This should never happen. We checked for a supported manager when the row was postponed
return ABSTAIN;
equinoxManager.addConditionsForDomain(results);
}
return postponed ? POSTPONED : ABSTAIN;
}
SecurityRow getRow(int i) {
return rows.length <= i || i < 0 ? null : rows[i];
}
SecurityRow getRow(String name) {
for (int i = 0; i < rows.length; i++) {
if (name.equals(rows[i].getName()))
return rows[i];
}
return null;
}
SecurityRow[] getRows() {
return rows;
}
String[] getEncodedRows() {
String[] encoded = new String[rows.length];
for (int i = 0; i < rows.length; i++)
encoded[i] = rows[i].getEncoded();
return encoded;
}
public void add(Permission permission) {
throw new SecurityException();
}
public Enumeration<Permission> elements() {
return BundlePermissions.EMPTY_ENUMERATION;
}
public boolean implies(Permission permission) {
return (evaluate(null, permission) & SecurityTable.GRANTED) != 0;
}
}
|
