我正在使用Apache的HTTPClient在Java中工作并尝试连接到graph.facebook.com。我收到“SSLPeerUnverifiedException：No peer certificate”错误，所以我猜Facebook的CA不在默认密钥库中。所以我需要用我想要信任的所有证书创建自己的密钥库，是吗？所以我找到了以下用于获取证书的命令：
echo | openssl s_client -connect graph.facebook.com:443 2>&1 | \
sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > mycert.pem
不知道那里发生了什么，但似乎有效。我将证书添加到Bouncy Castle格式的密钥库中。我使用新的密钥库创建了一个SSLSocketFactory，但它仍然不起作用。
我的第一个猜测是，也许我没有链中的所有证书（显然这些东西都是连锁店）。那么我怎么知道是否涉及所谓的“中间”CA？我如何获得这些证书？我甚至走在正确的轨道上吗？
答案 0 :(得分：8)
我终于有时间研究这个问题，事实证明它非常简单！我只缺少openssl命令的一个选项：showcerts选项。以下是获取适合连接到Facebook图像服务器的证书的示例。
注意：我还发现，要验证SSL连接，您不希望在密钥库中添加要连接的端点的证书。您只需要中间和根证书颁发机构。在某些情况下，只有根CA或者您将获得异常。有关详细信息，请参阅this great blog post。
$ openssl s_client -connect graph.facebook.com:443 -showcerts
CONNECTED(00000003)
depth=2 /C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert High Assurance EV Root CA
verify error:num=20:unable to get local issuer certificate
verify return:0
---
Certificate chain
0 s:/C=US/ST=California/L=Palo Alto/O=Facebook, Inc./CN=*.facebook.com
i:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert High Assurance CA-3
-----BEGIN CERTIFICATE-----
MIIFgjCCBGqgAwIBAgIQDKKbZcnESGaLDuEaVk6fQjANBgkqhkiG9w0BAQUFADBm
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
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wlDtxULGOFRyGIZZPmbV2eNq5xdU/g3IuBEhL722mTpAye9FU/J8Wsnw54/gANyO
Gzkewigua8ip8Lbs9Cht399yAfbfhUP1DrAm/xEcnHrzPr3cdCtOyJaM6SRPpRqH
ITK5Nc06tat9lXVosSinT3KqydzxBYua9gCFFiR3x3DgZfvXkC6KDdUlDrNcJUub
a1BHnLLP4mxTHL6faAXYd05IxNn/IA==
-----END CERTIFICATE-----
1 s:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert High Assurance CA-3
i:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert High Assurance EV Root CA
-----BEGIN CERTIFICATE-----
MIIGVTCCBT2gAwIBAgIQCFH5WYFBRcq94CTiEsnCDjANBgkqhkiG9w0BAQUFADBs
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9ZKNu8BVIASm2LAXFszj0Mi0PeXZhMbT9m5teMl5Q+h6N/9cNUm/ocU=
-----END CERTIFICATE-----
2 s:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert High Assurance EV Root CA
i:/C=US/O=Entrust.net/OU=www.entrust.net/CPS incorp. by ref. (limits liab.)/OU=(c) 1999 Entrust.net Limited/CN=Entrust.net Secure Server Certification Authority
-----BEGIN CERTIFICATE-----
MIIEQjCCA6ugAwIBAgIEQodApTANBgkqhkiG9w0BAQUFADCBwzELMAkGA1UEBhMC
VVMxFDASBgNVBAoTC0VudHJ1c3QubmV0MTswOQYDVQQLEzJ3d3cuZW50cnVzdC5u
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nXZwC99CcvhPQRFkpdLq/NWvEfQVOGecIKhLd1qRMkIy54Wz3zY=
-----END CERTIFICATE-----
---
Server certificate
subject=/C=US/ST=California/L=Palo Alto/O=Facebook, Inc./CN=*.facebook.com
issuer=/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert High Assurance CA-3
---
No client certificate CA names sent
---
SSL handshake has read 4285 bytes and written 309 bytes
---
New, TLSv1/SSLv3, Cipher is RC4-MD5
Server public key is 1024 bit
Compression: NONE
Expansion: NONE
SSL-Session:
Protocol : TLSv1
Cipher : RC4-MD5
Session-ID: A2AD56513E9EB36D5E4EC193977882BEEC5EC64D07D8E4310C562CC3A4571913
Session-ID-ctx:
Master-Key: 3AC56DD593C864A17D00B08CEFEDB299607491C5E2ABAFE14E2AABADDC8A734B888CC6389BDBE40782EA5ED6E3EAFE4A
Key-Arg : None
Start Time: 1300747299
Timeout : 300 (sec)
Verify return code: 0 (ok)
---
答案 1 :(得分：2)
使用HttpClient 4.1获取SSL连接的证书链有几种可能性
（1）TrustStrategy＃isTrusted（）可用于在ssl握手期间检查远程服务器提供的证书链，同时建立安全连接。
（2）HttpRoutedConnection＃getSSLSession（）可用于获取对已建立的SSL会话的详细信息的引用，其中许多内容应包含远程服务器的完整证书链。
答案 2 :(得分：1)
SSL Certificate Chain resolver下载证书的所有中间证书，并将其与给定证书连接。