openssl: add subcommand pages (#4886)

pages/common/openssl.md

@@ -3,34 +3,14 @@
 > OpenSSL cryptographic toolkit.
 > More information: <https://www.openssl.org>.
 
-- Generate a 2048bit RSA private key and save it to a file:
+- Print a list of available subcommands:
 
-`openssl genrsa -out {{filename.key}} 2048`
+`openssl help`
 
-- Generate a certificate signing request to be sent to a certificate authority:
+- Print options for a specific subcommand:
 
-`openssl req -new -sha256 -key {{filename.key}} -out {{filename.csr}}`
+`openssl help {{x509}}`
 
-- Generate a self-signed certificate from a certificate signing request valid for some number of days:
+- Print the version of OpenSSL:
 
-`openssl x509 -req -days {{days}} -in {{filename.csr}} -signkey {{filename.key}} -out {{filename.crt}}`
-
-- Display certificate information:
-
-`openssl x509 -in {{filename.crt}} -noout -text`
-
-- Display a certificate's expiration date:
-
-`openssl x509 -enddate -noout -in {{filename.pem}}`
-
-- Display the start and expiry dates for a domain's certificate:
-
-`openssl s_client -connect {{host}}:{{port}} 2>/dev/null | openssl x509 -noout -dates`
-
-- Display the certificate presented by an SSL/TLS server:
-
-`openssl s_client -connect {{host}}:{{port}} </dev/null`
-
-- Display the complete certificate chain of an HTTPS server:
-
-`openssl s_client -connect {{host}}:443 -showcerts </dev/null`
+`openssl version`