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Booting from Encrypted Disks on FreeBSD

Formale Metadaten

Titel
Booting from Encrypted Disks on FreeBSD
Untertitel
GELI in the boot code
Serientitel
Anzahl der Teile
42
Autor
Lizenz
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Herausgeber
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Inhaltliche Metadaten

Fachgebiet
Genre
Abstract
FreeBSD has supported disk encryption with GBDE and GELI since 2002 and 2005 respectively. However, booting the system required storing the loader and kernel unencrypted so that the requisite GEOM module could be loaded to handle decryption. This became a significantly larger stumbling block with the introduction of ZFS, as having multiple separate partitions detracts from the advantages of ZFS, and also causes headaches when upgrading the operating system. With the growing popularity of ZFS Boot Environments, a solution was needed that allowed the kernel and loader to remain part of the primary file system, even if it was encrypted. This paper provides an overview of the design of the GELI enabled boot code and loader, as well as the numerous challenges encountered during their development. A walk through the tale of woe that was implementing support for GELI in the FreeBSD bootcode and loader. Hear the story of a very junior developer persisting through countless complications and roadblocks to finally arrive at working code. Learn just how complicated it is to boot a computer, and how much worse it can get. In the end, we are left with working ZFS Boot Environments, even with fully encrypted pools. Overview: The x86 boot process MBR GPT Investigation Stage Initial Implementation Roadblocks Dealing with UFS Overcoming Limits Adding More Encryption Password Caching