http://blog.csdn.net/lemonzone2010/article/details/46515521

1.linux 访问 https 证书问题

[root@boss-test-dev001-jydx ~]# curl -v https://mobile.mycard520.com.tw
* About to connect() to mobile.mycard520.com.tw port 443 (#0)
*   Trying 220.130.127.122... connected
* Connected to mobile.mycard520.com.tw (220.130.127.122) port 443 (#0)
* Initializing NSS with certpath: sql:/etc/pki/nssdb
*   CAfile: /etc/pki/tls/certs/ca-bundle.crt
  CApath: none
* Certificate is signed by an untrusted issuer: 'CN=TWCA Secure SSL Certification Authority,OU=Secure SSL Sub-CA,O=TAIWAN-CA,C=TW'
* NSS error -8172
* Closing connection #0
* Peer certificate cannot be authenticated with known CA certificates
curl: (60) Peer certificate cannot be authenticated with known CA certificates
More details here: http://curl.haxx.se/docs/sslcerts.html

curl performs SSL certificate verification by default, using a "bundle"
 of Certificate Authority (CA) public keys (CA certs). If the default
 bundle file isn't adequate, you can specify an alternate file
 using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
 the bundle, the certificate verification probably failed due to a
 problem with the certificate (it might be expired, or the name might
 not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
 the -k (or --insecure) option.

2.现有 证书twca.cer 需要添加到 linux 证书信任列表

相关证书转换参见:http://netkiller.github.io/cryptography/openssl/format.html

#转换格式 .cer 到 .pem
openssl x509 -inform der -in twca.cer  -out twca.pem

#追加到信任列表
cat twca.pem >> /etc/pki/tls/certs/ca-bundle.crt

3.添加后访问成功

[root@boss-test-dev01 certs]# curl -v https://mobile.mycard520.com.tw/billing/RECEIVE.aspx
* About to connect() to mobile.mycard520.com.tw port 443 (#0)
*   Trying 220.130.127.122... connected
* Connected to mobile.mycard520.com.tw (220.130.127.122) port 443 (#0)
* Initializing NSS with certpath: sql:/etc/pki/nssdb
*   CAfile: /etc/pki/tls/certs/ca-bundle.crt
  CApath: none
* SSL connection using SSL_RSA_WITH_RC4_128_MD5
* Server certificate:
*       subject: CN=mobile.mycard520.com.tw,OU=IT,O=Soft-World International Corporation,L=Kaohsiung,ST=Taiwan,C=TW
*       start date: Apr 29 03:21:58 2015 GMT
*       expire date: Nov 12 15:59:59 2017 GMT
*       common name: mobile.mycard520.com.tw
*       issuer: CN=TWCA Secure SSL Certification Authority,OU=Secure SSL Sub-CA,O=TAIWAN-CA,C=TW
> GET /billing/RECEIVE.aspx HTTP/1.1
> User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.13.1.0 zlib/1.2.3 libidn/1.18 libssh2/1.2.2
> Host: mobile.mycard520.com.tw
> Accept: */*
> 
< HTTP/1.1 200 OK
< Cache-Control: private
< Content-Type: application/json;charset=utf-8
< Date: Tue, 16 Jun 2015 02:52:04 GMT
< Content-Length: 18
< Set-Cookie: NSC_Npcjmf-XfcQ*80=ffffffffaf181f5345525d5f4f58455e445a4a423660;path=/;httponly
< 
* Connection #0 to host mobile.mycard520.com.tw left intact
* Closing connection #0
{ "ResultCode":0

4.对于java中如果使用 HttpClient 访问https 可以使用以下命令导入到jre中的作为信任证书

 keytool -import -keystore "/usr/local/jdk/jre/lib/security/cacerts"  -storepass changeit -keypass changeit -alias twca -file twca.cer

过程中提示是否信任:输入yes即可

Trust this certificate? [no]: 

配置过程如下:

[root@boss-test-dev01 ~]# keytool -import -keystore "/usr/local/jdk/jre/lib/security/cacerts"  -storepass changeit -keypass changeit -alias twca -file /root/twca.cer
Owner: CN=TWCA Root Certification Authority, OU=Root CA, O=TAIWAN-CA, C=TW
Issuer: CN=TWCA Root Certification Authority, OU=Root CA, O=TAIWAN-CA, C=TW
Serial number: 1
Valid from: Thu Aug 28 15:24:33 CST 2008 until: Tue Dec 31 23:59:59 CST 2030
Certificate fingerprints:
         MD5:  AA:08:8F:F6:F9:7B:B7:F2:B1:A7:1E:9B:EA:EA:BD:79
         SHA1: CF:9E:87:6D:D3:EB:FC:42:26:97:A3:B5:A3:7A:A0:76:A9:06:23:48
         Signature algorithm name: SHA1withRSA
         Version: 3

Extensions: 

#1: ObjectId: 2.5.29.15 Criticality=true
KeyUsage [
  Key_CertSign
  Crl_Sign
]

#2: ObjectId: 2.5.29.19 Criticality=true
BasicConstraints:[
  CA:true
  PathLen:2147483647
]

#3: ObjectId: 2.5.29.14 Criticality=false
SubjectKeyIdentifier [
KeyIdentifier [
0000: 6A 38 5B 26 8D DE 8B 5A   F2 4F 7A 54 83 19 18 E3  j8[&...Z.OzT....
0010: 08 35 A6 BA                                        .5..
]
]

Trust this certificate? [no]:  yes
Certificate was added to keystore

参考文献:http://segmentfault.com/a/1190000002569859