History of The Libreswan Project
Libreswan has been under active development for over 15 years, going back to The FreeS/WAN Project founded in 1996 by John Gilmore and Hugh Daniel. The code was forked into a continuation as The Openswan Project in 2003. In 2012 it was forced to rename itself to The Libreswan Project due to a lawsuit filed over the trademark of the name "openswan".
The FreeS/WAN days (1995 - 2003)
The goal was to develop IPsec and DNS standards for encryption for use on the internet. The goal was to encrypt 5% of internet traffic per year, until the entire internet would only use encrypted communications. The FreeS/WAN project usually had about five paid people working on the code, all paid for by Gilmore.
At the time encryption was very uncommon, and free software implementing encryptions was scarce. SSLeay, the precursor to OpenSSL was being developed for encryption between web servers and clients. Most people were not thinking about nation state eavesdropping and monitoring, but the Crypto War was raging. The goal of the freeswan software was to deploy widespread Opportunistic Encryption and make encryption ubiquitous before national security reasons could outlaw encryption for the public. To prevent the US government from claiming ownership of freeswan through National Security Letters ("NSLs"), Gilmore himself and other US citizens were not allowed to write any code for freeswan. This restriction caused a lot of harm because it prevented the freeswan code from being merged into the Linux kernel and made it much harder for individuals to deploy freeswan.
Meanwhile, corporations required secure connections over the internet and the need for Virtual Private Networks ("VPNs") was another motivation to develop a usable encryption standard. These also used IPsec but in various different ways to satisy the needs of different companies.
The standard that emerged from the Internet Engineering Task Force became known as the IPsec suite. It consists of many standards documents (RFC's) that handle the authentication via the Internet Key Exchange protocol and uses IPsec transforms to encrypt data. Various encryption and authentication algorithms are supported and standarized. Adoption of Opportunistic Encryption was non-existent. A few technical hurdles made deployment difficult. The secure version of DNS got delayed by many years. The DNS root zone finally got signed using DNSSEC in July 15, 2010 - after a decade delay. During that time, freeswan's use of the DNSSEC was prevented by a late move within the IETF that stated only DNS itself could use DNSSEC KEY records, now renamed to DNSKEY records. This meant that freeswan had to revert back to bad old TXT records. IPsec got its own DNS record type IPSECKEY in 2005 but it would take a number of years for deployed DNS software to actually support this new record type. Additionally, endusers never got the expected access to their reverse DNS zones to publish their public keys required for OE IPsec.
Linux kernel adoption of freeswan never happened either. In part due to the "non US code" rule enforced by Gilmore. Lack of cooperation by the kernel people responsible for networking and crypto in the Linux kernel also played a big part. Despite the freeswan's team solid appearances for a few years at the combined Ottawa Linux Symposium and Kernel Summit conferences, the Linux people embarked on their own paths, eventually going through a number of new crypto subsystems that failed to gain widespread support. This resulted in both teams spending years of effort maintaining two competing kernel IPsec stacks, KLIPS vs NETKEY, where even today there is not one unifying stack that has the good features of both stacks.
The public at large seemed less concerned about government eavesdropping. The Echelon spying network was revealed by Nicky Hager and had no noticeable impact on the deployment of encrypted communications. Throughout 90's and 2000's, not many people considered an unencrypted internet a real problem until the revelations of Edward Snowden in 2013, a full decade after Gilmore had given up on his attempt to encrypt the entire internet with freeswan.
From FreeS/WAN to Openswan (2003 - 2011)
Commercial companies were using freeswan as one of their key interoperability tests during "bake off" events. Andreas Steffen wrote a large patch to add X.509 support to freeswan, something that Gilmore refused to merge in. NAT-Traversal support written by Mathieu Lafon was another essential feature needed for commercial VPN support that Gilmore refused to let into the freeswan code. One of the freeswan volunteers, Ken Bantoft, maintained a version of freeswan with these patches merged in, and called it "super-freeswan". Gilmore was not happy with the use of the name "freeswan" as he did not want those internet crippling technologies associated with the freeswan name.
In July 2003, Gilmore and Paul Wouters, another active freeswan volunteer, met up at the Chaos Communications Camp near Berlin and devised a plan to continue IPsec development using freeswan without Gilmore's sponsorship. Wouters and the other volunteers would fork the code, and Gilmore would do one more release of freeswan with large chunks of code removed that was only useful for commercial VPN deployments. This effort started under the workname "openswan", based on the freebsd/openbsd name history. The name stuck. Gilmore released two more freeswan releases with VPN code removed and ended his project.
The Openswan Project moved the focus of the software from OE towards VPN technology in general. Four of the openswan volunteers founded the company Xelerance to offer commercial support for openswan that would be used to continue openswan development. Unhampered by restrictions imposed by Gilmore with freeswan, the openswan code took over from freeswan and saw widespread adoption and inclusion into the main Linux distributions such as Red Hat Enterprise Linux ("RHEL"), Debian and SuSe Linux. Enterprise features such as XAUTH and SAref tracking for L2TP/IPsec support were added. Openswan worked well in the enterprise. This in itself caused a problem for Xelerance. Enterprise users mostly used RHEL, and thus paid Red Hat for commercial support. IPsec and IKE worked well enough that its users hardly ever wanted new features developed. Or they were willing to wait for others to pay or develop these features. While Xelerance still sponsored hosting for The Openswan Project, it changed its focus to survive. One by one the original founders left the company. Wouters was the last one to leave in December 2011. His departure triggered a dispute between The Openswan Project and Xelerance about who owned the openswan brand. Lawsuits were filed, and as is common when free software developers are sued by corporations, it was cheaper and easier to walk away and rename the software. Libreswan was born.
Libreswan (2011 - now)
Libreswan is maintained by The Libreswan Project.