OpenSSL commands to check and verify your SSL certificate, key and CSR

https://support.asperasoft.com/hc/en-us/articles/216128468-OpenSSL-commands-to-check-and-verify-your-SSL-certificate-key-and-CSR

It can be useful to check a certificate and key before applying them to your server. The following commands help verify the certificate, key, and CSR (Certificate Signing Request).

(1)Check a certificate
Check a certificate and return information about it (signing authority, expiration date, etc.):

#openssl x509 -in server.crt -text -noout

(2)Check a key
Check the SSL key and verify the consistency:
#openssl rsa -in server.key -check

(3)Check a CSR
Verify the CSR and print CSR data filled in when generating the CSR:
#openssl req -text -noout -verify -in server.csr

(4)Verify a certificate and key matches
These two commands print out md5 checksums of the certificate and key; the checksums can be compared to verify that the certificate and key match.
#openssl x509 -noout -modulus -in server.crt| openssl md5
#openssl rsa -noout -modulus -in server.key| openssl md5

For the WAS or MQ, you can also use the keytool which under the jre/bin folder

#keytool -printcertreq -file your_req_file
#keytool -printcert -file your_cert_file

For Windows Platform, you can use certutil command (built-in) to review the file.
certutil -dump <file>


*** the MQ gskit command (runmqckm) can not do this job.

How can I test if my server supports a specific SSL protocol?

1. Linux command line tool:
openssl can help you test which SSL protocols your server is configured to use.
openssl

If a protocol is enabled, the openssl s_client command will wait for input (or Control-D).
If the protocol is disabled, openssl will report an exception similiar to the one reproduced below:
21112:error:1407F0E5:SSL routines:SSL2_WRITE:ssl handshake failure:s2_pkt.c:428:

Openssl examples:
openssl s_client -connect ihshostname:443 -ssl2
openssl s_client -connect ihshostname:443 -ssl3
openssl s_client -connect ihshostname:443 -tls1

#openssl s_client -connect www.google.com:443 -ssl3
CONNECTED(00000003)
23569:error:1408F10B:SSL routines:SSL3_GET_RECORD:wrong version number:s3_pkt.c:293:

#openssl s_client -connect localhost:1414 -cipher ECDHE-RSA-DES-CBC3-SHA

#openssl s_client -connect localhost:1414 -showcerts

#openssl ciphers  ==> 列出openssl可用的cipher名稱, 以:分隔

**** perl one liner 可用在此處, 把原本用:分隔不易查看的資訊, 改以每筆一行的方式列出

#openssl ciphers|perl -ne 's/:/\n/g;print'


2. online website check tool
https://www.ssllabs.com/ssltest/

3. standalone test tool (TestSSLServer)
https://www.bolet.org/TestSSLServer/

4. IHS v8 or above version command:
Windows:
httpd -t -D DUMP_SSL_CONFIG
Linux:
apachectl -t -D DUMP_SSL_CONFIG

http://publib.boulder.ibm.com/httpserv/ihsdiag/ssl_questions.html#sslprotsupptest


5. use nmap to help to verify which cipherspec is supported by SSL server

nmap --script ssl-enum-ciphers -p port_number ip_address

# nmap --script ssl-enum-ciphers -p 1477 localhost
Starting Nmap 7.70 ( https://nmap.org ) at 2019-06-03 10:56 CST
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00018s latency).
Other addresses for localhost (not scanned): ::1

PORT     STATE SERVICE
1477/tcp open  ms-sna-server
| ssl-enum-ciphers:
|   TLSv1.0:
|     ciphers:
|       TLS_RSA_WITH_AES_128_CBC_SHA (rsa 1024) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA (rsa 1024) - A
|     compressors:
|       NULL
|     cipher preference: server
|   TLSv1.2:
|     ciphers:
|       TLS_RSA_WITH_AES_128_CBC_SHA256 (rsa 1024) - A
|       TLS_RSA_WITH_AES_256_CBC_SHA256 (rsa 1024) - A
|       TLS_RSA_WITH_AES_128_GCM_SHA256 (rsa 1024) - A
|       TLS_RSA_WITH_AES_256_GCM_SHA384 (rsa 1024) - A
|       TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (secp384r1) - A
|       TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (secp256r1) - A
|       TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (secp384r1) - A
|     compressors:
|       NULL
|     cipher preference: server
|_  least strength: A

Nmap done: 1 IP address (1 host up) scanned in 1.63 seconds

Ref:

SSL 相關的測試工具

https://www.qa-knowhow.com/?p=3888

SSL handshake concept:
https://support.f5.com/csp/article/K15292