![]() So whether this process is optional seems to depend on the software involved. That might be because some products using SSL make it difficult to use a different private key. In even more recent years, the above URL stopped returning such a definitive statement, and the requirement appears to have been removed. That is, this process should almost certainly not be considered optional anymore. But furthermore, today (Wed May 11, 2011), includes the statement For higher server security GlobalSign does not allow reusing private keys. When GlobalSign required a change from 1024 to 2048 bit keys, that clearly could not be done. ![]() ![]() In fact, we began to assume that process, essentially generating a new expiry date for an existing public key, was what "renewing" meant. Note In the past we would frequently re-use the old private key and use it to generate a new CSR when renewing a certificate. If it is necessary to transferĪ private key to another machine or user, be careful how you do it. You should use an appropriate umask to ensure the privacy of Note the last argument on the command-line "2048". Subcommands useful for examining and working with SSL certificatesĪs of 2011, GlobalSign Incorporated, the certificate authority chosenīy the University of Waterloo, requires a key (pair) of at leastĢ048 bits. The openssl command tends to be on a normal user path, and has Generating RSA private key, 2048 bit long modulus Here we generate a 2048-bit key, placing it in file new2048.key.Ĭscf.cs% openssl genrsa -out new2048.key 2048 To generate a new private key, you can use the openssl command. The one containing the old key is an appropriate choice. Generating a new key should be done in a private subdirectory Note that private keys must be kept as secret as possible.įiles containing private keys should preferably be readable onlyĪn equivalent service userid e.g. CertOpensslToy - education by degenerative examples.Useful command for examining and manipulating SSL certificates See ST 67484 for an example that should be reworked into this wiki page.Īn alternative version of this same information, with include files as links. SSLCACertificateFile /software/sslCerts-1/config/certs/cacert.pem needs to be present in the web server configuration, with that file containing the intermediate GlobalSign certificate. Start at IST's documentation for SSL certificate management: (=> )įor Apache (1.3?) web servers the directive Testing a Recently Changed Mail Server Certificate.Get Certificates from a Web Page using Firefox.Testing a Recently Changed Web Server Certificate.Using openssl command to check Certificate installations.Certificate Format Used by most Web and SMTP Servers.Certificate Format Used by UW IMAPD and perhaps others.Receive the Certificate from the Certificate Authority.Submit the CSR to the Certificate Authority.Actual Certificate Generated by a Very Similar Request.Generate a Certificate Signing Request (CSR) Including Alt Names (SANs).Some Relevant History of https AltNames.Generate a Certificate Signing Request (CSR).Useful command for examining and manipulating SSL certificates.A more likely scenario is that other vendors produce analogous software. On the otherhand, letsencrypt seems likely to remain the only client/provider for the certbot service. ![]() Of course, letsencrypt is a specific means of utilizing certbot and certbot (NOT correctly rendered as the twikiwork CertBot) is probably a better way to refer to the newer practice. Seem to have been documented in the twiki anywhere.Ĭan be made to replace the installation in question. In CSCF the direction has been to move all servers towards The string as in their domain seems advisable. Since it's proper name Let's Encrypt is difficult to search for, using Prior to today, the string "letsencrypt" did not occur in this twiki. Here we describe the procedures for updating SSL certificates for web servers (https), IMAP servers (imaps), and other similar services (Dawn/Adrian - feel free to elaborate!)
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