An Introduction to OpenSSL Programming, Part I of II
In this article, we've only scratched the surface of the issues involved with using OpenSSL. Here's a (nonexhaustive) list of additional issues.
A more sophisticated approach to checking server certificates against the server hostname is to use the X.509 subjectAltName extension. In order to make this check, you would need to extract this extension from the certificate and then check it against the hostname. Additionally, it would be nice to be able to check hostnames against wild-carded names in certificates.
Note that these applications handle errors simply by exiting with an error. A real application would, of course, be able to recognize errors and signal them to the user or some audit log rather than just exiting.
In the next article, we'll be discussing a number of advanced OpenSSL features, including session resumption, multiplexed and nonblocking I/O and client authentication.
Thanks to Lisa Dusseault, Steve Henson, Lutz Jaenicke and Ben Laurie for help with OpenSSL and review of this article.
|PostgreSQL, the NoSQL Database||Jan 29, 2015|
|HPC Cluster Grant Accepting Applications!||Jan 28, 2015|
|Sharing Admin Privileges for Many Hosts Securely||Jan 28, 2015|
|Red Hat Enterprise Linux 7.1 beta available on IBM Power Platform||Jan 23, 2015|
|Designing with Linux||Jan 22, 2015|
|Wondershaper—QOS in a Pinch||Jan 21, 2015|
- PostgreSQL, the NoSQL Database
- Sharing Admin Privileges for Many Hosts Securely
- HPC Cluster Grant Accepting Applications!
- Designing with Linux
- Wondershaper—QOS in a Pinch
- Internet of Things Blows Away CES, and it May Be Hunting for YOU Next
- January 2015 Issue of Linux Journal: Security
- Ideal Backups with zbackup
- Red Hat Enterprise Linux 7.1 beta available on IBM Power Platform
- Slow System? iotop Is Your Friend
Editorial Advisory Panel
Thank you to our 2014 Editorial Advisors!
- Jeff Parent
- Brad Baillio
- Nick Baronian
- Steve Case
- Chadalavada Kalyana
- Caleb Cullen
- Keir Davis
- Michael Eager
- Nick Faltys
- Dennis Frey
- Philip Jacob
- Jay Kruizenga
- Steve Marquez
- Dave McAllister
- Craig Oda
- Mike Roberts
- Chris Stark
- Patrick Swartz
- David Lynch
- Alicia Gibb
- Thomas Quinlan
- Carson McDonald
- Kristen Shoemaker
- Charnell Luchich
- James Walker
- Victor Gregorio
- Hari Boukis
- Brian Conner
- David Lane