Difference between revisions of "cmd/openssl"

from HTYP, the free directory anyone can edit if they can prove to me that they're not a spambot
< cmd
Jump to navigation Jump to search
m (Woozle moved page openssl to cmd/openssl: putting all pages for commands under cmd/)
m
 
Line 7: Line 7:
 
</hide>
 
</hide>
 
==About==
 
==About==
[[openssl]] is the command-line program for managing [[Secure Sockets Layer|SSL]] data and certificates.
+
{{l/cmd|openssl}} is the command-line program for managing [[Secure Sockets Layer|SSL]] data and certificates.
 
==Examples==
 
==Examples==
 
* To check that a certificate file is valid, and see what it says (does ''not'' work with key files) - typical file extensions are .crt, .ca:
 
* To check that a certificate file is valid, and see what it says (does ''not'' work with key files) - typical file extensions are .crt, .ca:

Latest revision as of 01:27, 26 November 2022

About

openssl is the command-line program for managing SSL data and certificates.

Examples

  • To check that a certificate file is valid, and see what it says (does not work with key files) - typical file extensions are .crt, .ca:
    openssl x509 -text -in <filename>
  • To verify how a web server is presenting its certificate over https:
    openssl s_client -connect <domain>:443
    • To get the expiration date:
      echo | openssl s_client -connect <domain>:443 2>/dev/null | openssl x509 -noout -dates
  • To generate a new private key:
    openssl genrsa -des3 -out <filename.key> 4096
  • To remove the pass phrase from a private key:
    openssl rsa -in <oldfile.key> -out <newfile.key>
    There is slightly more explanation here.

Notes

  • openssl verify [1] seems to be the tool of choice for checking certificate files stored locally.
  • This also has some useful information about using openssl, and a little bit about the "chaining" concept.

Links