-
-
Notifications
You must be signed in to change notification settings - Fork 2.4k
/
DefaultTrustedSocketFactory.java
167 lines (140 loc) · 6.25 KB
/
DefaultTrustedSocketFactory.java
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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
package com.fsck.k9.helper;
import java.io.IOException;
import java.net.Socket;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import android.content.Context;
import android.net.SSLCertificateSocketFactory;
import android.os.Build;
import android.text.TextUtils;
import com.fsck.k9.mail.MessagingException;
import com.fsck.k9.mail.ssl.TrustManagerFactory;
import com.fsck.k9.mail.ssl.TrustedSocketFactory;
import javax.net.ssl.KeyManager;
import javax.net.ssl.SNIHostName;
import javax.net.ssl.SNIServerName;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLParameters;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import timber.log.Timber;
public class DefaultTrustedSocketFactory implements TrustedSocketFactory {
private static final String[] ENABLED_CIPHERS;
private static final String[] ENABLED_PROTOCOLS;
private static final String[] DISALLOWED_CIPHERS = {
"SSL_RSA_WITH_DES_CBC_SHA",
"SSL_DHE_RSA_WITH_DES_CBC_SHA",
"SSL_DHE_DSS_WITH_DES_CBC_SHA",
"SSL_RSA_EXPORT_WITH_RC4_40_MD5",
"SSL_RSA_EXPORT_WITH_DES40_CBC_SHA",
"SSL_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA",
"SSL_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA",
"SSL_RSA_WITH_3DES_EDE_CBC_SHA",
"SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA",
"SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA",
"TLS_ECDHE_RSA_WITH_RC4_128_SHA",
"TLS_ECDHE_ECDSA_WITH_RC4_128_SHA",
"TLS_ECDH_RSA_WITH_RC4_128_SHA",
"TLS_ECDH_ECDSA_WITH_RC4_128_SHA",
"SSL_RSA_WITH_RC4_128_SHA",
"SSL_RSA_WITH_RC4_128_MD5",
"TLS_ECDH_RSA_WITH_NULL_SHA",
"TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA",
"TLS_ECDH_anon_WITH_NULL_SHA",
"TLS_ECDH_anon_WITH_RC4_128_SHA",
"TLS_RSA_WITH_NULL_SHA256"
};
private static final String[] DISALLOWED_PROTOCOLS = {
"SSLv3"
};
static {
String[] enabledCiphers = null;
String[] supportedProtocols = null;
try {
SSLContext sslContext = SSLContext.getInstance("TLS");
sslContext.init(null, null, null);
SSLSocketFactory sf = sslContext.getSocketFactory();
SSLSocket sock = (SSLSocket) sf.createSocket();
enabledCiphers = sock.getEnabledCipherSuites();
/*
* Retrieve all supported protocols, not just the (default) enabled
* ones. TLSv1.1 & TLSv1.2 are supported on API levels 16+, but are
* only enabled by default on API levels 20+.
*/
supportedProtocols = sock.getSupportedProtocols();
} catch (Exception e) {
Timber.e(e, "Error getting information about available SSL/TLS ciphers and protocols");
}
ENABLED_CIPHERS = (enabledCiphers == null) ? null : remove(enabledCiphers, DISALLOWED_CIPHERS);
ENABLED_PROTOCOLS = (supportedProtocols == null) ? null : remove(supportedProtocols, DISALLOWED_PROTOCOLS);
}
private final Context context;
private final TrustManagerFactory trustManagerFactory;
public DefaultTrustedSocketFactory(Context context, TrustManagerFactory trustManagerFactory) {
this.context = context;
this.trustManagerFactory = trustManagerFactory;
}
protected static String[] remove(String[] enabled, String[] disallowed) {
List<String> items = new ArrayList<>();
Collections.addAll(items, enabled);
if (disallowed != null) {
for (String item : disallowed) {
items.remove(item);
}
}
return items.toArray(new String[0]);
}
public Socket createSocket(Socket socket, String host, int port, String clientCertificateAlias)
throws NoSuchAlgorithmException, KeyManagementException, MessagingException, IOException {
TrustManager[] trustManagers = new TrustManager[] { trustManagerFactory.getTrustManagerForDomain(host, port) };
KeyManager[] keyManagers = null;
if (!TextUtils.isEmpty(clientCertificateAlias)) {
keyManagers = new KeyManager[] { new KeyChainKeyManager(context, clientCertificateAlias) };
}
SSLContext sslContext = SSLContext.getInstance("TLS");
sslContext.init(keyManagers, trustManagers, null);
SSLSocketFactory socketFactory = sslContext.getSocketFactory();
Socket trustedSocket;
if (socket == null) {
trustedSocket = socketFactory.createSocket();
} else {
trustedSocket = socketFactory.createSocket(socket, host, port, true);
}
SSLSocket sslSocket = (SSLSocket) trustedSocket;
hardenSocket(sslSocket);
setSniHost(socketFactory, sslSocket, host);
return trustedSocket;
}
private static void hardenSocket(SSLSocket sock) {
if (ENABLED_CIPHERS != null) {
sock.setEnabledCipherSuites(ENABLED_CIPHERS);
}
if (ENABLED_PROTOCOLS != null) {
sock.setEnabledProtocols(ENABLED_PROTOCOLS);
}
}
public static void setSniHost(SSLSocketFactory factory, SSLSocket socket, String hostname) {
if (factory instanceof android.net.SSLCertificateSocketFactory) {
SSLCertificateSocketFactory sslCertificateSocketFactory = (SSLCertificateSocketFactory) factory;
sslCertificateSocketFactory.setHostname(socket, hostname);
} else if (Build.VERSION.SDK_INT >= 24) {
SSLParameters sslParameters = socket.getSSLParameters();
List<SNIServerName> sniServerNames = Collections.singletonList(new SNIHostName(hostname));
sslParameters.setServerNames(sniServerNames);
socket.setSSLParameters(sslParameters);
} else {
setHostnameViaReflection(socket, hostname);
}
}
private static void setHostnameViaReflection(SSLSocket socket, String hostname) {
try {
socket.getClass().getMethod("setHostname", String.class).invoke(socket, hostname);
} catch (Throwable e) {
Timber.e(e, "Could not call SSLSocket#setHostname(String) method ");
}
}
}