Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 Google Inc. All Rights Reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * 1. Redistributions of source code must retain the above copyright |
| 8 | * notice, this list of conditions and the following disclaimer. |
| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer in the |
| 11 | * documentation and/or other materials provided with the distribution. |
| 12 | * |
| 13 | * THIS SOFTWARE IS PROVIDED BY GOOGLE, INC. ``AS IS'' AND ANY |
| 14 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| 17 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 18 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 20 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| 21 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 23 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 24 | * |
| 25 | */ |
| 26 | |
| 27 | #include "config.h" |
| 28 | #include "core/dom/SecurityContext.h" |
| 29 | |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 30 | #include "core/html/parser/HTMLParserIdioms.h" |
| 31 | #include "core/page/ContentSecurityPolicy.h" |
Torne (Richard Coles) | e524955 | 2013-05-15 11:35:13 +0100 | [diff] [blame] | 32 | #include "weborigin/SecurityOrigin.h" |
Ben Murdoch | e69819b | 2013-07-17 14:56:49 +0100 | [diff] [blame] | 33 | #include "wtf/text/StringBuilder.h" |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 34 | |
| 35 | namespace WebCore { |
| 36 | |
| 37 | SecurityContext::SecurityContext() |
| 38 | : m_mayDisplaySeamlesslyWithParent(false) |
| 39 | , m_haveInitializedSecurityOrigin(false) |
| 40 | , m_sandboxFlags(SandboxNone) |
| 41 | { |
| 42 | } |
| 43 | |
| 44 | SecurityContext::~SecurityContext() |
| 45 | { |
| 46 | } |
| 47 | |
| 48 | void SecurityContext::setSecurityOrigin(PassRefPtr<SecurityOrigin> securityOrigin) |
| 49 | { |
| 50 | m_securityOrigin = securityOrigin; |
| 51 | m_haveInitializedSecurityOrigin = true; |
| 52 | } |
| 53 | |
| 54 | void SecurityContext::setContentSecurityPolicy(PassOwnPtr<ContentSecurityPolicy> contentSecurityPolicy) |
| 55 | { |
| 56 | m_contentSecurityPolicy = contentSecurityPolicy; |
| 57 | } |
| 58 | |
| 59 | bool SecurityContext::isSecureTransitionTo(const KURL& url) const |
| 60 | { |
| 61 | // If we haven't initialized our security origin by now, this is probably |
| 62 | // a new window created via the API (i.e., that lacks an origin and lacks |
| 63 | // a place to inherit the origin from). |
| 64 | if (!haveInitializedSecurityOrigin()) |
| 65 | return true; |
| 66 | |
| 67 | RefPtr<SecurityOrigin> other = SecurityOrigin::create(url); |
| 68 | return securityOrigin()->canAccess(other.get()); |
| 69 | } |
| 70 | |
| 71 | void SecurityContext::enforceSandboxFlags(SandboxFlags mask) |
| 72 | { |
| 73 | m_sandboxFlags |= mask; |
| 74 | |
| 75 | // The SandboxOrigin is stored redundantly in the security origin. |
| 76 | if (isSandboxed(SandboxOrigin) && securityOrigin() && !securityOrigin()->isUnique()) { |
| 77 | setSecurityOrigin(SecurityOrigin::createUnique()); |
| 78 | didUpdateSecurityOrigin(); |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | void SecurityContext::didUpdateSecurityOrigin() |
| 83 | { |
| 84 | // Subclasses can override this function if the need to do extra work when the security origin changes. |
| 85 | } |
| 86 | |
| 87 | SandboxFlags SecurityContext::parseSandboxPolicy(const String& policy, String& invalidTokensErrorMessage) |
| 88 | { |
| 89 | // http://www.w3.org/TR/html5/the-iframe-element.html#attr-iframe-sandbox |
| 90 | // Parse the unordered set of unique space-separated tokens. |
| 91 | SandboxFlags flags = SandboxAll; |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 92 | unsigned length = policy.length(); |
| 93 | unsigned start = 0; |
| 94 | unsigned numberOfTokenErrors = 0; |
| 95 | StringBuilder tokenErrors; |
| 96 | while (true) { |
Ben Murdoch | 591b958 | 2013-07-10 11:41:44 +0100 | [diff] [blame] | 97 | while (start < length && isHTMLSpace(policy[start])) |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 98 | ++start; |
| 99 | if (start >= length) |
| 100 | break; |
| 101 | unsigned end = start + 1; |
Ben Murdoch | 591b958 | 2013-07-10 11:41:44 +0100 | [diff] [blame] | 102 | while (end < length && !isHTMLSpace(policy[end])) |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 103 | ++end; |
| 104 | |
| 105 | // Turn off the corresponding sandbox flag if it's set as "allowed". |
| 106 | String sandboxToken = policy.substring(start, end - start); |
| 107 | if (equalIgnoringCase(sandboxToken, "allow-same-origin")) |
| 108 | flags &= ~SandboxOrigin; |
| 109 | else if (equalIgnoringCase(sandboxToken, "allow-forms")) |
| 110 | flags &= ~SandboxForms; |
| 111 | else if (equalIgnoringCase(sandboxToken, "allow-scripts")) { |
| 112 | flags &= ~SandboxScripts; |
| 113 | flags &= ~SandboxAutomaticFeatures; |
| 114 | } else if (equalIgnoringCase(sandboxToken, "allow-top-navigation")) |
| 115 | flags &= ~SandboxTopNavigation; |
| 116 | else if (equalIgnoringCase(sandboxToken, "allow-popups")) |
| 117 | flags &= ~SandboxPopups; |
| 118 | else if (equalIgnoringCase(sandboxToken, "allow-pointer-lock")) |
| 119 | flags &= ~SandboxPointerLock; |
| 120 | else { |
| 121 | if (numberOfTokenErrors) |
| 122 | tokenErrors.appendLiteral(", '"); |
| 123 | else |
| 124 | tokenErrors.append('\''); |
| 125 | tokenErrors.append(sandboxToken); |
| 126 | tokenErrors.append('\''); |
| 127 | numberOfTokenErrors++; |
| 128 | } |
| 129 | |
| 130 | start = end + 1; |
| 131 | } |
| 132 | |
| 133 | if (numberOfTokenErrors) { |
| 134 | if (numberOfTokenErrors > 1) |
| 135 | tokenErrors.appendLiteral(" are invalid sandbox flags."); |
| 136 | else |
| 137 | tokenErrors.appendLiteral(" is an invalid sandbox flag."); |
| 138 | invalidTokensErrorMessage = tokenErrors.toString(); |
| 139 | } |
| 140 | |
| 141 | return flags; |
| 142 | } |
| 143 | |
Torne (Richard Coles) | 53e740f | 2013-05-09 18:38:43 +0100 | [diff] [blame] | 144 | } |