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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 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.net; | 5 package org.chromium.net; |
6 | 6 |
7 import android.util.Log; | |
8 | |
9 import org.chromium.base.CalledByNative; | 7 import org.chromium.base.CalledByNative; |
10 import org.chromium.base.JNINamespace; | 8 import org.chromium.base.JNINamespace; |
11 | 9 |
12 import java.lang.reflect.Method; | 10 /** |
13 import java.security.NoSuchAlgorithmException; | 11 * Specifies all the dependencies from the native OpenSSL engine on an Android K eyStore. |
14 import java.security.PrivateKey; | 12 */ |
15 import java.security.Signature; | |
16 import java.security.interfaces.DSAKey; | |
17 import java.security.interfaces.DSAParams; | |
18 import java.security.interfaces.DSAPrivateKey; | |
19 import java.security.interfaces.ECKey; | |
20 import java.security.interfaces.ECPrivateKey; | |
21 import java.security.interfaces.RSAKey; | |
22 import java.security.interfaces.RSAPrivateKey; | |
23 import java.security.spec.ECParameterSpec; | |
24 | |
25 @JNINamespace("net::android") | 13 @JNINamespace("net::android") |
26 public class AndroidKeyStore { | 14 public interface AndroidKeyStore { |
27 | |
28 private static final String TAG = "AndroidKeyStore"; | |
29 | |
30 //////////////////////////////////////////////////////////////////// | |
31 // | |
32 // Message signing support. | |
33 | 15 |
34 /** | 16 /** |
35 * Returns the public modulus of a given RSA private key as a byte | 17 * Return the system EVP_PKEY handle corresponding to a given PrivateKey |
36 * buffer. | 18 * object. |
37 * This can be used by native code to convert the modulus into | |
38 * an OpenSSL BIGNUM object. Required to craft a custom native RSA | |
39 * object where RSA_size() works as expected. | |
40 * | 19 * |
41 * @param key A PrivateKey instance, must implement RSAKey. | 20 * This shall only be used when the "NONEwithRSA" signature is not |
42 * @return A byte buffer corresponding to the modulus. This is | 21 * available, as described in rawSignDigestWithPrivateKey(). I.e. |
43 * big-endian representation of a BigInteger. | 22 * never use this on Android 4.2 or higher. |
23 * | |
24 * This can only work in Android 4.0.4 and higher, for older versions | |
25 * of the platform (e.g. 4.0.3), there is no system OpenSSL EVP_PKEY, | |
26 * but the private key contents can be retrieved directly with | |
27 * the getEncoded() method. | |
28 * | |
29 * This assumes that the target device uses a vanilla AOSP | |
30 * implementation of its java.security classes, which is also | |
31 * based on OpenSSL (fortunately, no OEM has apperently changed to | |
32 * a different implementation, according to the Android team). | |
33 * | |
34 * Note that the object returned was created with the platform version | |
35 * of OpenSSL, and _not_ the one that comes with Chromium. Whether the | |
36 * object can be used safely with the Chromium OpenSSL library depends | |
37 * on differences between their actual ABI / implementation details. | |
38 * | |
39 * To better understand what's going on below, please refer to the | |
40 * following source files in the Android 4.0.4 and 4.1 source trees: | |
41 * libcore/luni/src/main/java/org/apache/harmony/xnet/provider/jsse/OpenSSLR SAPrivateKey.java | |
42 * libcore/luni/src/main/native/org_apache_harmony_xnet_provider_jsse_Native Crypto.cpp | |
43 * | |
44 * @param key The PrivateKey handle. | |
45 * @return The EVP_PKEY handle, as a 32-bit integer (0 if not available) | |
44 */ | 46 */ |
45 @CalledByNative | 47 @CalledByNative |
46 public static byte[] getRSAKeyModulus(PrivateKey key) { | 48 int getOpenSSLHandleForPrivateKey(AndroidPrivateKey key); |
Ryan Sleevi
2014/02/14 20:57:51
Why did you re-order these methods? Makes it much
Yaron
2014/02/14 22:06:59
Not intentional, sorry. Can't honestly say when it
| |
47 if (key instanceof RSAKey) { | |
48 return ((RSAKey) key).getModulus().toByteArray(); | |
49 } else { | |
50 Log.w(TAG, "Not a RSAKey instance!"); | |
51 return null; | |
52 } | |
53 } | |
54 | 49 |
55 /** | 50 /** |
56 * Returns the 'Q' parameter of a given DSA private key as a byte | 51 * Return the type of a given PrivateKey object. This is an integer |
57 * buffer. | 52 * that maps to one of the values defined by org.chromium.net.PrivateKeyType , |
58 * This can be used by native code to convert it into an OpenSSL BIGNUM | 53 * which is itself auto-generated from net/android/private_key_type_list.h |
59 * object where DSA_size() works as expected. | 54 * @param key The PrivateKey handle |
60 * | 55 * @return key type, or PrivateKeyType.INVALID if unknown. |
61 * @param key A PrivateKey instance. Must implement DSAKey. | |
62 * @return A byte buffer corresponding to the Q parameter. This is | |
63 * a big-endian representation of a BigInteger. | |
64 */ | 56 */ |
65 @CalledByNative | 57 @CalledByNative |
66 public static byte[] getDSAKeyParamQ(PrivateKey key) { | 58 int getPrivateKeyType(AndroidPrivateKey key); |
67 if (key instanceof DSAKey) { | |
68 DSAParams params = ((DSAKey) key).getParams(); | |
69 return params.getQ().toByteArray(); | |
70 } else { | |
71 Log.w(TAG, "Not a DSAKey instance!"); | |
72 return null; | |
73 } | |
74 } | |
75 | |
76 /** | |
77 * Returns the 'order' parameter of a given ECDSA private key as a | |
78 * a byte buffer. | |
79 * @param key A PrivateKey instance. Must implement ECKey. | |
80 * @return A byte buffer corresponding to the 'order' parameter. | |
81 * This is a big-endian representation of a BigInteger. | |
82 */ | |
83 @CalledByNative | |
84 public static byte[] getECKeyOrder(PrivateKey key) { | |
85 if (key instanceof ECKey) { | |
86 ECParameterSpec params = ((ECKey) key).getParams(); | |
87 return params.getOrder().toByteArray(); | |
88 } else { | |
89 Log.w(TAG, "Not an ECKey instance!"); | |
90 return null; | |
91 } | |
92 } | |
93 | |
94 /** | |
95 * Returns the encoded data corresponding to a given PrivateKey. | |
96 * Note that this will fail for platform keys on Android 4.0.4 | |
97 * and higher. It can be used on 4.0.3 and older platforms to | |
98 * route around the platform bug described below. | |
99 * @param key A PrivateKey instance | |
100 * @return encoded key as PKCS#8 byte array, can be null. | |
101 */ | |
102 @CalledByNative | |
103 public static byte[] getPrivateKeyEncodedBytes(PrivateKey key) { | |
104 return key.getEncoded(); | |
105 } | |
106 | 59 |
107 /** | 60 /** |
108 * Sign a given message with a given PrivateKey object. This method | 61 * Sign a given message with a given PrivateKey object. This method |
109 * shall only be used to implement signing in the context of SSL | 62 * shall only be used to implement signing in the context of SSL |
110 * client certificate support. | 63 * client certificate support. |
111 * | 64 * |
112 * The message will actually be a hash, computed by OpenSSL itself, | 65 * The message will actually be a hash, computed by OpenSSL itself, |
113 * depending on the type of the key. The result should match exactly | 66 * depending on the type of the key. The result should match exactly |
114 * what the vanilla implementations of the following OpenSSL function | 67 * what the vanilla implementations of the following OpenSSL function |
115 * calls do: | 68 * calls do: |
116 * | 69 * |
117 * - For a RSA private key, this should be equivalent to calling | 70 * - For a RSA private key, this should be equivalent to calling |
118 * RSA_private_encrypt(..., RSA_PKCS1_PADDING), i.e. it must | 71 * RSA_private_encrypt(..., RSA_PKCS1_PADDING), i.e. it must |
119 * generate a raw RSA signature. The message must be either a | 72 * generate a raw RSA signature. The message must be either a |
120 * combined, 36-byte MD5+SHA1 message digest or a DigestInfo | 73 * combined, 36-byte MD5+SHA1 message digest or a DigestInfo |
121 * value wrapping a message digest. | 74 * value wrapping a message digest. |
122 * | 75 * |
123 * - For a DSA and ECDSA private keys, this should be equivalent to | 76 * - For a DSA and ECDSA private keys, this should be equivalent to |
124 * calling DSA_sign(0,...) and ECDSA_sign(0,...) respectively. The | 77 * calling DSA_sign(0,...) and ECDSA_sign(0,...) respectively. The |
125 * message must be a hash and the function shall compute a direct | 78 * message must be a hash and the function shall compute a direct |
126 * DSA/ECDSA signature for it. | 79 * DSA/ECDSA signature for it. |
127 * | 80 * |
128 * @param privateKey The PrivateKey handle. | 81 * @param key The PrivateKey handle. |
129 * @param message The message to sign. | 82 * @param message The message to sign. |
130 * @return signature as a byte buffer. | 83 * @return signature as a byte buffer. |
131 * | 84 * |
132 * Important: Due to a platform bug, this function will always fail on | 85 * Important: Due to a platform bug, this function will always fail on |
133 * Android < 4.2 for RSA PrivateKey objects. See the | 86 * Android < 4.2 for RSA PrivateKey objects. See the |
134 * getOpenSSLHandleForPrivateKey() below for work-around. | 87 * getOpenSSLHandleForPrivateKey() below for work-around. |
135 */ | 88 */ |
136 @CalledByNative | 89 @CalledByNative |
137 public static byte[] rawSignDigestWithPrivateKey(PrivateKey privateKey, | 90 byte[] rawSignDigestWithPrivateKey(AndroidPrivateKey key, byte[] message); |
138 byte[] message) { | |
139 // Get the Signature for this key. | |
140 Signature signature = null; | |
141 // Hint: Algorithm names come from: | |
142 // http://docs.oracle.com/javase/6/docs/technotes/guides/security/Standa rdNames.html | |
143 try { | |
144 if (privateKey instanceof RSAPrivateKey) { | |
145 // IMPORTANT: Due to a platform bug, this will throw NoSuchAlgor ithmException | |
146 // on Android 4.0.x and 4.1.x. Fixed in 4.2 and higher. | |
147 // See https://android-review.googlesource.com/#/c/40352/ | |
148 signature = Signature.getInstance("NONEwithRSA"); | |
149 } else if (privateKey instanceof DSAPrivateKey) { | |
150 signature = Signature.getInstance("NONEwithDSA"); | |
151 } else if (privateKey instanceof ECPrivateKey) { | |
152 signature = Signature.getInstance("NONEwithECDSA"); | |
153 } | |
154 } catch (NoSuchAlgorithmException e) { | |
155 ; | |
156 } | |
157 | |
158 if (signature == null) { | |
159 Log.e(TAG, "Unsupported private key algorithm: " + privateKey.getAlg orithm()); | |
160 return null; | |
161 } | |
162 | |
163 // Sign the message. | |
164 try { | |
165 signature.initSign(privateKey); | |
166 signature.update(message); | |
167 return signature.sign(); | |
168 } catch (Exception e) { | |
169 Log.e(TAG, "Exception while signing message with " + privateKey.getA lgorithm() + | |
170 " private key: " + e); | |
171 return null; | |
172 } | |
173 } | |
174 | 91 |
175 /** | 92 /** |
176 * Return the type of a given PrivateKey object. This is an integer | 93 * Returns the encoded data corresponding to a given PrivateKey. |
177 * that maps to one of the values defined by org.chromium.net.PrivateKeyType , | 94 * Note that this will fail for platform keys on Android 4.0.4 |
178 * which is itself auto-generated from net/android/private_key_type_list.h | 95 * and higher. It can be used on 4.0.3 and older platforms to |
179 * @param privateKey The PrivateKey handle | 96 * route around the platform bug described below. |
180 * @return key type, or PrivateKeyType.INVALID if unknown. | 97 * @param key A PrivateKey instance |
98 * @return encoded key as PKCS#8 byte array, can be null. | |
181 */ | 99 */ |
182 @CalledByNative | 100 @CalledByNative |
183 public static int getPrivateKeyType(PrivateKey privateKey) { | 101 byte[] getPrivateKeyEncodedBytes(AndroidPrivateKey key); |
184 if (privateKey instanceof RSAPrivateKey) | |
185 return PrivateKeyType.RSA; | |
186 if (privateKey instanceof DSAPrivateKey) | |
187 return PrivateKeyType.DSA; | |
188 if (privateKey instanceof ECPrivateKey) | |
189 return PrivateKeyType.ECDSA; | |
190 else | |
191 return PrivateKeyType.INVALID; | |
192 } | |
193 | 102 |
194 /** | 103 /** |
195 * Return the system EVP_PKEY handle corresponding to a given PrivateKey | 104 * Returns the 'order' parameter of a given ECDSA private key as a |
196 * object, obtained through reflection. | 105 * a byte buffer. |
197 * | 106 * @param key A PrivateKey instance. Must implement ECKey. |
198 * This shall only be used when the "NONEwithRSA" signature is not | 107 * @return A byte buffer corresponding to the 'order' parameter. |
199 * available, as described in rawSignDigestWithPrivateKey(). I.e. | 108 * This is a big-endian representation of a BigInteger. |
200 * never use this on Android 4.2 or higher. | |
201 * | |
202 * This can only work in Android 4.0.4 and higher, for older versions | |
203 * of the platform (e.g. 4.0.3), there is no system OpenSSL EVP_PKEY, | |
204 * but the private key contents can be retrieved directly with | |
205 * the getEncoded() method. | |
206 * | |
207 * This assumes that the target device uses a vanilla AOSP | |
208 * implementation of its java.security classes, which is also | |
209 * based on OpenSSL (fortunately, no OEM has apperently changed to | |
210 * a different implementation, according to the Android team). | |
211 * | |
212 * Note that the object returned was created with the platform version | |
213 * of OpenSSL, and _not_ the one that comes with Chromium. Whether the | |
214 * object can be used safely with the Chromium OpenSSL library depends | |
215 * on differences between their actual ABI / implementation details. | |
216 * | |
217 * To better understand what's going on below, please refer to the | |
218 * following source files in the Android 4.0.4 and 4.1 source trees: | |
219 * libcore/luni/src/main/java/org/apache/harmony/xnet/provider/jsse/OpenSSLR SAPrivateKey.java | |
220 * libcore/luni/src/main/native/org_apache_harmony_xnet_provider_jsse_Native Crypto.cpp | |
221 * | |
222 * @param privateKey The PrivateKey handle. | |
223 * @return The EVP_PKEY handle, as a 32-bit integer (0 if not available) | |
224 */ | 109 */ |
225 @CalledByNative | 110 @CalledByNative |
226 public static int getOpenSSLHandleForPrivateKey(PrivateKey privateKey) { | 111 byte[] getECKeyOrder(AndroidPrivateKey key); |
227 // Sanity checks | |
228 if (privateKey == null) { | |
229 Log.e(TAG, "privateKey == null"); | |
230 return 0; | |
231 } | |
232 if (!(privateKey instanceof RSAPrivateKey)) { | |
233 Log.e(TAG, "does not implement RSAPrivateKey"); | |
234 return 0; | |
235 } | |
236 // First, check that this is a proper instance of OpenSSLRSAPrivateKey | |
237 // or one of its sub-classes. | |
238 Class<?> superClass; | |
239 try { | |
240 superClass = Class.forName( | |
241 "org.apache.harmony.xnet.provider.jsse.OpenSSLRSAPrivateKey" ); | |
242 } catch (Exception e) { | |
243 // This may happen if the target device has a completely different | |
244 // implementation of the java.security APIs, compared to vanilla | |
245 // Android. Highly unlikely, but still possible. | |
246 Log.e(TAG, "Cannot find system OpenSSLRSAPrivateKey class: " + e); | |
247 return 0; | |
248 } | |
249 if (!superClass.isInstance(privateKey)) { | |
250 // This may happen if the PrivateKey was not created by the "Android OpenSSL" | |
251 // provider, which should be the default. That could happen if an OE M decided | |
252 // to implement a different default provider. Also highly unlikely. | |
253 Log.e(TAG, "Private key is not an OpenSSLRSAPrivateKey instance, its class name is:" + | |
254 privateKey.getClass().getCanonicalName()); | |
255 return 0; | |
256 } | |
257 | 112 |
258 try { | 113 /** |
259 // Use reflection to invoke the 'getOpenSSLKey()' method on | 114 * Returns the 'Q' parameter of a given DSA private key as a byte |
260 // the private key. This returns another Java object that wraps | 115 * buffer. |
261 // a native EVP_PKEY. Note that the method is final, so calling | 116 * This can be used by native code to convert it into an OpenSSL BIGNUM |
262 // the superclass implementation is ok. | 117 * object where DSA_size() works as expected. |
263 Method getKey = superClass.getDeclaredMethod("getOpenSSLKey"); | 118 * |
264 getKey.setAccessible(true); | 119 * @param key A PrivateKey instance. Must implement DSAKey. |
265 Object opensslKey = null; | 120 * @return A byte buffer corresponding to the Q parameter. This is |
266 try { | 121 * a big-endian representation of a BigInteger. |
267 opensslKey = getKey.invoke(privateKey); | 122 */ |
268 } finally { | 123 @CalledByNative |
269 getKey.setAccessible(false); | 124 byte[] getDSAKeyParamQ(AndroidPrivateKey key); |
270 } | |
271 if (opensslKey == null) { | |
272 // Bail when detecting OEM "enhancement". | |
273 Log.e(TAG, "getOpenSSLKey() returned null"); | |
274 return 0; | |
275 } | |
276 | 125 |
277 // Use reflection to invoke the 'getPkeyContext' method on the | 126 /** |
278 // result of the getOpenSSLKey(). This is an 32-bit integer | 127 * Returns the public modulus of a given RSA private key as a byte |
279 // which is the address of an EVP_PKEY object. | 128 * buffer. |
280 Method getPkeyContext; | 129 * This can be used by native code to convert the modulus into |
281 try { | 130 * an OpenSSL BIGNUM object. Required to craft a custom native RSA |
282 getPkeyContext = opensslKey.getClass().getDeclaredMethod("getPke yContext"); | 131 * object where RSA_size() works as expected. |
283 } catch (Exception e) { | 132 * |
284 // Bail here too, something really not working as expected. | 133 * @param key A PrivateKey instance, must implement RSAKey. |
285 Log.e(TAG, "No getPkeyContext() method on OpenSSLKey member:" + e); | 134 * @return A byte buffer corresponding to the modulus. This is |
286 return 0; | 135 * big-endian representation of a BigInteger. |
287 } | 136 */ |
288 getPkeyContext.setAccessible(true); | 137 @CalledByNative |
289 int evp_pkey = 0; | 138 byte[] getRSAKeyModulus(AndroidPrivateKey key); |
290 try { | |
291 evp_pkey = (Integer) getPkeyContext.invoke(opensslKey); | |
292 } finally { | |
293 getPkeyContext.setAccessible(false); | |
294 } | |
295 if (evp_pkey == 0) { | |
296 // The PrivateKey is probably rotten for some reason. | |
297 Log.e(TAG, "getPkeyContext() returned null"); | |
298 } | |
299 return evp_pkey; | |
300 | 139 |
301 } catch (Exception e) { | 140 /** |
302 Log.e(TAG, "Exception while trying to retrieve system EVP_PKEY handl e: " + e); | 141 * Called when the native OpenSSL engine no longer needs access to the under lying key. |
303 return 0; | 142 */ |
304 } | 143 @CalledByNative |
305 } | 144 void releaseKey(AndroidPrivateKey key); |
306 } | 145 } |
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