当我与某些IRC服务器(而非其他IRC服务器)建立SSL连接时(大概是由于服务器的首选加密方法),出现以下异常:
Caused by: java.lang.RuntimeException: Could not generate DH keypair
at com.sun.net.ssl.internal.ssl.DHCrypt.<init>(DHCrypt.java:106)
at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverKeyExchange(ClientHandshaker.java:556)
at com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:183)
at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Handshaker.java:593)
at com.sun.net.ssl.internal.ssl.Handshaker.process_record(Handshaker.java:529)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:893)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1138)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1165)
... 3 more
最终原因:
Caused by: java.security.InvalidAlgorithmParameterException: Prime size must be multiple of 64, and can only range from 512 to 1024 (inclusive)
at com.sun.crypto.provider.DHKeyPairGenerator.initialize(DashoA13*..)
at java.security.KeyPairGenerator$Delegate.initialize(KeyPairGenerator.java:627)
at com.sun.net.ssl.internal.ssl.DHCrypt.<init>(DHCrypt.java:100)
... 10 more
演示此问题的服务器示例是perfection.esper.net:6697(这是一个IRC服务器)。未显示问题的服务器的示例是kornbluth.freenode.net:6697。[不足为奇的是,每个网络上的所有服务器都共享相同的行为。]
我的代码(如所述,在连接到某些SSL服务器时有效)是:
SSLContext sslContext = SSLContext.getInstance("SSL");
sslContext.init(null, trustAllCerts, new SecureRandom());
s = (SSLSocket)sslContext.getSocketFactory().createSocket();
s.connect(new InetSocketAddress(host, port), timeout);
s.setSoTimeout(0);
((SSLSocket)s).startHandshake();
是最后一个startHandshake引发异常。是的,'trustAllCerts'正在进行一些魔术。该代码会强制SSL系统不验证证书。(所以...这不是证书问题。)
显然,一种可能性是esper的服务器配置错误,但我进行搜索,但未找到其他任何引用来说明esper的SSL端口有问题的人,并且'openssl'连接到它(请参见下文)。所以我想知道这是否是Java默认SSL支持的限制或其他限制。有什么建议?
这是我在命令行中使用“ openssl”连接至Hole.esper.net 6697时发生的情况:
~ $ openssl s_client -connect aperture.esper.net:6697
CONNECTED(00000003)
depth=0 /C=GB/ST=England/L=London/O=EsperNet/OU=aperture.esper.net/CN=*.esper.net/emailAddress=support@esper.net
verify error:num=18:self signed certificate
verify return:1
depth=0 /C=GB/ST=England/L=London/O=EsperNet/OU=aperture.esper.net/CN=*.esper.net/emailAddress=support@esper.net
verify return:1
---
Certificate chain
0 s:/C=GB/ST=England/L=London/O=EsperNet/OU=aperture.esper.net/CN=*.esper.net/emailAddress=support@esper.net
i:/C=GB/ST=England/L=London/O=EsperNet/OU=aperture.esper.net/CN=*.esper.net/emailAddress=support@esper.net
---
Server certificate
-----BEGIN CERTIFICATE-----
[There was a certificate here, but I deleted it to save space]
-----END CERTIFICATE-----
subject=/C=GB/ST=England/L=London/O=EsperNet/OU=aperture.esper.net/CN=*.esper.net/emailAddress=support@esper.net
issuer=/C=GB/ST=England/L=London/O=EsperNet/OU=aperture.esper.net/CN=*.esper.net/emailAddress=support@esper.net
---
No client certificate CA names sent
---
SSL handshake has read 2178 bytes and written 468 bytes
---
New, TLSv1/SSLv3, Cipher is DHE-RSA-AES256-SHA
Server public key is 2048 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
SSL-Session:
Protocol : TLSv1
Cipher : DHE-RSA-AES256-SHA
Session-ID: 51F1D40A1B044700365D3BD1C61ABC745FB0C347A334E1410946DCB5EFE37AFD
Session-ID-ctx:
Master-Key: DF8194F6A60B073E049C87284856B5561476315145B55E35811028C4D97F77696F676DB019BB6E271E9965F289A99083
Key-Arg : None
Start Time: 1311801833
Timeout : 300 (sec)
Verify return code: 18 (self signed certificate)
---
如前所述,毕竟,它确实可以成功连接,这远远超过了我的Java应用程序所能说的。
如果相关,我正在使用OS X 10.6.8,Java版本1.6.0_26。
openssl
在问题中看到输出中使用的服务器大小:“密码是DHE-RSA-AES256-SHA,服务器公钥是2048位”。以及2048> 1024 :-)。
Server public key (size)
过去和现在都是证书中的密钥。s_client
2011年根本没有显示临时密钥;1.0.2在2015年及以后的表现会Server Temp Key
更高。虽然一台好的服务器通常应使DHE大小与RSA-auth大小相同。
Prime size must be multiple of 64, and can only range from 512 to 1024 (inclusive)
。不知道服务器在这里发送了什么大小,规范对此有何说明。