我编写了一个Java客户端应用程序，使用客户端证书连接到Apache Web服务器，并通过HTTP PUT将文件上传到该服务器。对于小文件，它能够正常工作，但是在处理大文件时会崩溃。
Apache服务器日志显示如下：
...
OpenSSL: Handshake: done
...
Changed client verification type will force renegotiation
...
filling buffer, max size 131072 bytes
...
request body exceeds maximum size (131072) for SSL buffer
could not buffer message body to allow SSL renegotiation to proceed
...
OpenSSL: I/O error, 5 bytes expected to read on BIO
(104)Connection reset by peer: SSL input filter read failed.
(32)Broken pipe: core_output_filter: writing data to the network
Connection closed to child 20 with standard shutdown
客户端的响应是：
java.io.IOException: Server returned HTTP response code: 401 for URL
我不太熟悉这个过程，所以不确定是否需要重新协商或者是否有什么我可以做来避免它。或者也许我可以让客户端在重新协商完成之前等待再发送应用数据？以下是客户端代码摘录（已删除错误处理）：
URL url = new URL("my url goes here");
con = (HttpsURLConnection) url.openConnection();
con.setSSLSocketFactory(getMyCustomClientCertSocketFactory());
con.setRequestMethod("PUT");
con.setDoOutput(true);
con.connect();
writer = new OutputStreamWriter(con.getOutputStream());
writer.write(xml);
writer.close();
parseServerResponse(con.getInputStream());
我在考虑是否需要使用类似SSLSocket的低级API，并利用HandshakeCompletedListener？此外，我也想知道Apache SSLVerifyDepth指令是否与重新协商有关。我在每个目录上下文中设置了该指令（只有一个上传目录），值为2。Apache手册对此的解释如下：
“在每个目录上下文中，它会强制进行SSL重新协商，并在读取HTTP请求但在发送HTTP响应之前使用重新配置的客户端验证深度。”
根据您的要求，以下是Java调试输出：
keyStore is :
keyStore type is : jks
keyStore provider is :
init keystore
init keymanager of type SunX509
trustStore is: C:\Program Files\Java\jdk1.6.0_35\jre\lib\security\cacerts
trustStore type is : jks
trustStore provider is :
init truststore
adding as trusted cert:
...
trigger seeding of SecureRandom
done seeding SecureRandom
***
found key for : key-alias
chain [0] = [
[
...
]
***
trigger seeding of SecureRandom
done seeding SecureRandom
Allow unsafe renegotiation: false
Allow legacy hello messages: true
Is initial handshake: true
Is secure renegotiation: false
%% No cached client session
*** ClientHello, TLSv1
RandomCookie: ...
Session ID: {}
Cipher Suites: [SSL_RSA_WITH_RC4_128_MD5, SSL_RSA_WITH_RC4_128_SHA, TLS_RSA_WITH_AES_128_CBC_SHA, TLS_DHE_RSA_WITH_AES_128_CBC_SHA, TLS_DHE_DSS_WITH_AES_128_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, 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, TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
Compression Methods: { 0 }
***
main, WRITE: TLSv1 Handshake, length = 75
main, WRITE: SSLv2 client hello message, length = 101
main, READ: TLSv1 Handshake, length = 81
*** ServerHello, TLSv1
RandomCookie: ...
Session ID: ...
Cipher Suite: TLS_RSA_WITH_AES_128_CBC_SHA
Compression Method: 0
Extension renegotiation_info, renegotiated_connection: <empty>
***
%% Created: [Session-1, TLS_RSA_WITH_AES_128_CBC_SHA]
** TLS_RSA_WITH_AES_128_CBC_SHA
main, READ: TLSv1 Handshake, length = 4392
*** Certificate chain
chain [0] = [
[
...
Certificate Extensions: 8
[1]: ObjectId: 1.3.6.1.5.5.7.1.1 Criticality=false
AuthorityInfoAccess [
[
accessMethod: ...
accessLocation: URIName: ...
accessMethod: ...
accessLocation: URIName: ...
]
[2]: ObjectId: 2.5.29.35 Criticality=false
AuthorityKeyIdentifier [
KeyIdentifier [
...
]
]
[3]: ObjectId: 2.5.29.19 Criticality=false
BasicConstraints:[
CA:false
PathLen: undefined
]
[4]: ObjectId: 2.5.29.31 Criticality=false
CRLDistributionPoints [
[DistributionPoint:
[URIName: ...
]]
[5]: ObjectId: 2.5.29.32 Criticality=false
CertificatePolicies [
[CertificatePolicyId: ...
[PolicyQualifierInfo: [
qualifierID: ...
qualifier: ...
]] ]
]
[6]: ObjectId: 2.5.29.37 Criticality=false
ExtendedKeyUsages [
serverAuth
clientAuth
]
[7]: ObjectId: 2.5.29.15 Criticality=true
KeyUsage [
DigitalSignature
Key_Encipherment
]
[8]: ObjectId: 2.5.29.17 Criticality=false
SubjectAlternativeName [
DNSName: ...
]
]
Algorithm: [SHA1withRSA]
Signature:
...
]
...
***
main, READ: TLSv1 Handshake, length = 4
*** ServerHelloDone
*** ClientKeyExchange, RSA PreMasterSecret, TLSv1
main, WRITE: TLSv1 Handshake, length = 518
SESSION KEYGEN:
PreMaster Secret:
...
CONNECTION KEYGEN:
Client Nonce:
...
Server Nonce:
...
Master Secret:
...
Client MAC write Secret:
...
Server MAC write Secret:
...
Client write key:
...
Server write key:
...
Client write IV:
...
Server write IV:
...
main, WRITE: TLSv1 Change Cipher Spec, length = 1
*** Finished
verify_data: { 18, 162, 18, 251, 82, 111, 87, 133, 53, 240, 114, 155 }
***
main, WRITE: TLSv1 Handshake, length = 48
main, READ: TLSv1 Change Cipher Spec, length = 1
main, READ: TLSv1 Handshake, length = 48
*** Finished
verify_data: { 46, 206, 8, 40, 63, 252, 99, 190, 251, 183, 110, 201 }
***
%% Cached client session: [Session-1, TLS_RSA_WITH_AES_128_CBC_SHA]
main, WRITE: TLSv1 Application Data, length = 256
main, WRITE: TLSv1 Application Data, length = 32
main, WRITE: TLSv1 Application Data, length = 16416
main, WRITE: TLSv1 Application Data, length = 16416
...
main, WRITE: TLSv1 Application Data, length = 16416
main, WRITE: TLSv1 Application Data, length = 16416
main, WRITE: TLSv1 Application Data, length = 512
main, READ: TLSv1 Application Data, length = 304
按要求，这里是 getMyCustomClientCertSocketFactory 源代码（从 PEM 文件中获取证书和密钥）：
public static SSLSocketFactory getMyCustomClientCertSocketFactory(String pemPath,
boolean verifyPeer)
throws NoSuchAlgorithmException, FileNotFoundException, IOException,
KeyStoreException, CertificateException, UnrecoverableKeyException,
KeyManagementException, InvalidKeySpecException {
SSLContext context = SSLContext.getInstance("TLS");
byte[] certAndKey = IOUtil.fileToBytes(new File(pemPath));
byte[] certBytes = parseDERFromPEM(certAndKey,
"-----BEGIN CERTIFICATE-----", "-----END CERTIFICATE-----");
byte[] keyBytes = parseDERFromPEM(certAndKey,
"-----BEGIN PRIVATE KEY-----", "-----END PRIVATE KEY-----");
X509Certificate cert = generateX509CertificateFromDER(certBytes);
RSAPrivateKey key = generateRSAPrivateKeyFromDER(keyBytes);
KeyStore keystore = KeyStore.getInstance("JKS");
keystore.load(null);
keystore.setCertificateEntry("cert-alias", cert);
keystore.setKeyEntry("key-alias", key, "changeit".toCharArray(),
new Certificate[]{cert});
KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509");
kmf.init(keystore, "changeit".toCharArray());
KeyManager[] km = kmf.getKeyManagers();
TrustManager[] tm = null;
if (!verifyPeer) {
tm = new TrustManager[]{new TrustyTrustManager()};
}
context.init(km, tm, null);
return context.getSocketFactory();
}