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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 package org.chromium.webapk.lib.client; | 5 package org.chromium.webapk.lib.client; |
6 | 6 |
7 import static org.chromium.webapk.lib.common.WebApkConstants.WEBAPK_PACKAGE_PREF IX; | 7 import static org.chromium.webapk.lib.common.WebApkConstants.WEBAPK_PACKAGE_PREF IX; |
8 | 8 |
9 import android.content.Context; | 9 import android.content.Context; |
10 import android.content.Intent; | 10 import android.content.Intent; |
11 import android.content.pm.PackageInfo; | 11 import android.content.pm.PackageInfo; |
12 import android.content.pm.PackageManager; | 12 import android.content.pm.PackageManager; |
13 import android.content.pm.PackageManager.NameNotFoundException; | 13 import android.content.pm.PackageManager.NameNotFoundException; |
14 import android.content.pm.ResolveInfo; | 14 import android.content.pm.ResolveInfo; |
15 import android.content.pm.Signature; | 15 import android.content.pm.Signature; |
16 import android.util.Log; | 16 import android.util.Log; |
17 | 17 |
18 import java.util.Arrays; | 18 import java.util.Arrays; |
19 import java.util.LinkedList; | |
19 import java.util.List; | 20 import java.util.List; |
20 | 21 |
21 /** | 22 /** |
22 * Checks whether a URL belongs to a WebAPK, and whether a WebAPK is signed by t he WebAPK Minting | 23 * Checks whether a URL belongs to a WebAPK, and whether a WebAPK is signed by t he WebAPK Minting |
23 * Server. | 24 * Server. |
24 */ | 25 */ |
25 public class WebApkValidator { | 26 public class WebApkValidator { |
26 | 27 |
27 private static final String TAG = "WebApkValidator"; | 28 private static final String TAG = "WebApkValidator"; |
28 private static byte[] sExpectedSignature; | 29 private static byte[] sExpectedSignature; |
29 | 30 |
30 /** | 31 /** |
31 * Queries the PackageManager to determine whether a WebAPK can handle the U RL. Ignores | 32 * Queries the PackageManager to determine whether a WebAPK can handle the U RL. Ignores |
32 * whether the user has selected a default handler for the URL and whether t he default | 33 * whether the user has selected a default handler for the URL and whether t he default |
33 * handler is the WebAPK. | 34 * handler is the WebAPK. |
34 * | 35 * |
35 * NOTE(yfriedman): This can fail if multiple WebAPKs can match the supplied url. | 36 * NOTE(yfriedman): This can fail if multiple WebAPKs can match the supplied url. |
36 * | 37 * |
37 * @param context The application context. | 38 * @param context The application context. |
38 * @param url The url to check. | 39 * @param url The url to check. |
39 * @return Package name of WebAPK which can handle the URL. Null if the url should not be | 40 * @return Package name of WebAPK which can handle the URL. Null if the url should not be |
40 * handled by a WebAPK. | 41 * handled by a WebAPK. |
41 */ | 42 */ |
42 public static String queryWebApkPackage(Context context, String url) { | 43 public static String queryWebApkPackage(Context context, String url) { |
44 return findWebApkPackage(context, resolveInfosForUrl(context, url)); | |
45 } | |
46 | |
47 /** | |
48 * Queries the PackageManager to determine whether a WebAPK can handle the U RL. Ignores | |
49 * whether the user has selected a default handler for the URL and whether t he default | |
50 * handler is the WebAPK. | |
51 * | |
52 * NOTE: This can fail if multiple WebAPKs can match the supplied url. | |
nyquist
2017/02/28 07:04:19
What does fail mean in this scenario? From the cod
gonzalon
2017/02/28 16:12:24
Yes, I added a clarification on the comment about
| |
53 * | |
54 * @param context The application context. | |
55 * @param url The url to check. | |
nyquist
2017/02/28 07:04:19
Nit: Comments are written in normal English, so UR
gonzalon
2017/02/28 16:12:24
Done.
| |
56 * @return Resolve Info of a WebAPK which can handle the URL. Null if the ur l should not be | |
57 * handled by a WebAPK. | |
58 */ | |
59 public static ResolveInfo queryResolveInfo(Context context, String url) { | |
60 return findResolveInfo(context, resolveInfosForUrl(context, url)); | |
61 } | |
62 | |
63 /** | |
64 * Fetches the list of resolve infos from the PackageManager that can handle the URL. | |
nyquist
2017/02/28 07:04:19
{@link ResolveInfo}s
gonzalon
2017/02/28 16:12:24
Done.
| |
65 * | |
66 * @param context The application context. | |
67 * @param url The url to check. | |
68 * @return The list of resolve infos found that can handle the URL. | |
69 */ | |
70 private static List<ResolveInfo> resolveInfosForUrl(Context context, String url) { | |
nyquist
2017/02/28 07:04:19
Would you want to annotate this with @Nonnull and/
gonzalon
2017/02/28 16:12:23
Done.
| |
43 Intent intent; | 71 Intent intent; |
44 try { | 72 try { |
45 intent = Intent.parseUri(url, Intent.URI_INTENT_SCHEME); | 73 intent = Intent.parseUri(url, Intent.URI_INTENT_SCHEME); |
46 } catch (Exception e) { | 74 } catch (Exception e) { |
47 return null; | 75 return new LinkedList<>(); |
48 } | 76 } |
49 | 77 |
50 intent.addCategory(Intent.CATEGORY_BROWSABLE); | 78 intent.addCategory(Intent.CATEGORY_BROWSABLE); |
51 intent.setComponent(null); | 79 intent.setComponent(null); |
52 Intent selector = intent.getSelector(); | 80 Intent selector = intent.getSelector(); |
53 if (selector != null) { | 81 if (selector != null) { |
54 selector.addCategory(Intent.CATEGORY_BROWSABLE); | 82 selector.addCategory(Intent.CATEGORY_BROWSABLE); |
55 selector.setComponent(null); | 83 selector.setComponent(null); |
56 } | 84 } |
57 | 85 return context.getPackageManager().queryIntentActivities( |
58 List<ResolveInfo> resolveInfos = context.getPackageManager().queryIntent Activities( | |
59 intent, PackageManager.GET_RESOLVED_FILTER); | 86 intent, PackageManager.GET_RESOLVED_FILTER); |
60 return findWebApkPackage(context, resolveInfos); | |
61 } | 87 } |
62 | 88 |
63 /** | 89 /** |
64 * @param context The context to use to check whether WebAPK is valid. | 90 * @param context The context to use to check whether WebAPK is valid. |
65 * @param infos The ResolveInfos to search. | 91 * @param infos The ResolveInfos to search. |
66 * @return Package name of the ResolveInfo which corresponds to a WebAPK. Nu ll if none of the | 92 * @return Package name of the ResolveInfo which corresponds to a WebAPK. Nu ll if none of the |
67 * ResolveInfos corresponds to a WebAPK. | 93 * ResolveInfos corresponds to a WebAPK. |
68 */ | 94 */ |
69 public static String findWebApkPackage(Context context, List<ResolveInfo> in fos) { | 95 public static String findWebApkPackage(Context context, List<ResolveInfo> in fos) { |
96 ResolveInfo resolveInfo = findResolveInfo(context, infos); | |
97 if (resolveInfo != null) { | |
98 return resolveInfo.activityInfo.packageName; | |
99 } | |
100 return null; | |
101 } | |
102 | |
103 /** | |
104 * @param context The context to use to check whether WebAPK is valid. | |
105 * @param infos The ResolveInfos to search. | |
106 * @return ResolveInfo which corresponds to a WebAPK. Null if none of the Re solveInfos | |
107 * corresponds to a WebAPK. | |
108 */ | |
109 private static ResolveInfo findResolveInfo(Context context, List<ResolveInfo > infos) { | |
70 for (ResolveInfo info : infos) { | 110 for (ResolveInfo info : infos) { |
71 if (info.activityInfo != null | 111 if (info.activityInfo != null |
72 && isValidWebApk(context, info.activityInfo.packageName)) { | 112 && isValidWebApk(context, info.activityInfo.packageName)) { |
73 return info.activityInfo.packageName; | 113 return info; |
74 } | 114 } |
75 } | 115 } |
76 return null; | 116 return null; |
77 } | 117 } |
78 | 118 |
79 /** | 119 /** |
80 * Returns whether the provided WebAPK is installed and passes signature che cks. | 120 * Returns whether the provided WebAPK is installed and passes signature che cks. |
81 * @param context A context | 121 * @param context A context |
82 * @param webappPackageName The package name to check | 122 * @param webappPackageName The package name to check |
83 * @return true iff the WebAPK is installed and passes security checks | 123 * @return true iff the WebAPK is installed and passes security checks |
84 */ | 124 */ |
85 public static boolean isValidWebApk(Context context, String webappPackageNam e) { | 125 public static boolean isValidWebApk(Context context, String webappPackageNam e) { |
86 if (sExpectedSignature == null) { | 126 if (sExpectedSignature == null) { |
87 Log.wtf(TAG, "WebApk validation failure - expected signature not set ." | 127 Log.wtf(TAG, "WebApk validation failure - expected signature not set ." |
88 + "missing call to WebApkValidator.initWithBrowserHostSignat ure"); | 128 + "missing call to WebApkValidator.initWithBrowserHostSignat ure"); |
89 } | 129 } |
90 if (!webappPackageName.startsWith(WEBAPK_PACKAGE_PREFIX)) { | 130 if (!webappPackageName.startsWith(WEBAPK_PACKAGE_PREFIX)) { |
91 return false; | 131 return false; |
92 } | 132 } |
93 // check signature | 133 // check signature |
94 PackageInfo packageInfo = null; | 134 PackageInfo packageInfo = null; |
95 try { | 135 try { |
96 packageInfo = context.getPackageManager().getPackageInfo(webappPacka geName, | 136 packageInfo = context.getPackageManager().getPackageInfo(webappPacka geName, |
97 PackageManager.GET_SIGNATURES); | 137 PackageManager.GET_SIGNATURES); |
98 } catch (NameNotFoundException e) { | 138 } catch (NameNotFoundException e) { |
99 e.printStackTrace(); | 139 e.printStackTrace(); |
nyquist
2017/02/28 07:04:19
While you're at it, could you pleas remove this li
gonzalon
2017/02/28 16:12:23
Done.
| |
100 Log.d(TAG, "WebApk not found"); | 140 Log.d(TAG, "WebApk not found"); |
101 return false; | 141 return false; |
102 } | 142 } |
103 | 143 |
104 final Signature[] arrSignatures = packageInfo.signatures; | 144 final Signature[] arrSignatures = packageInfo.signatures; |
105 if (arrSignatures != null && arrSignatures.length == 2) { | 145 if (arrSignatures != null && arrSignatures.length == 2) { |
106 for (Signature signature : arrSignatures) { | 146 for (Signature signature : arrSignatures) { |
107 if (Arrays.equals(sExpectedSignature, signature.toByteArray())) { | 147 if (Arrays.equals(sExpectedSignature, signature.toByteArray())) { |
108 Log.d(TAG, "WebApk valid - signature match!"); | 148 Log.d(TAG, "WebApk valid - signature match!"); |
109 return true; | 149 return true; |
110 } | 150 } |
111 } | 151 } |
112 } | 152 } |
113 Log.d(TAG, "WebApk invalid"); | 153 Log.d(TAG, "WebApk invalid"); |
114 return false; | 154 return false; |
115 } | 155 } |
116 | 156 |
117 /** | 157 /** |
118 * Initializes the WebApkValidator with the expected signature that WebAPKs must be signed | 158 * Initializes the WebApkValidator with the expected signature that WebAPKs must be signed |
119 * with for the current host. | 159 * with for the current host. |
120 * @param expectedSignature | 160 * @param expectedSignature |
121 */ | 161 */ |
122 public static void initWithBrowserHostSignature(byte[] expectedSignature) { | 162 public static void initWithBrowserHostSignature(byte[] expectedSignature) { |
123 if (sExpectedSignature != null) { | 163 if (sExpectedSignature != null) { |
124 return; | 164 return; |
125 } | 165 } |
126 sExpectedSignature = Arrays.copyOf(expectedSignature, expectedSignature. length); | 166 sExpectedSignature = Arrays.copyOf(expectedSignature, expectedSignature. length); |
127 } | 167 } |
128 } | 168 } |
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