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When the KRL format was originally defined, it included support for
signing of KRL objects. However, the code to sign KRLs and verify KRL
signatues was never completed in OpenSSH.
Now, some years later, we have SSHSIG support in ssh-keygen that is
more general, well tested and actually works. So this removes the
semi-finished KRL signing/verification support from OpenSSH and
refactors the remaining code to realise the benefit - primarily, we
no longer need to perform multiple parsing passes over KRL objects.
ok markus@
OpenBSD-Commit-ID: 517437bab3d8180f695c775410c052340e038804
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This defines wire formats for optional KRL extensions and implements
parsing of the new submessages. No actual extensions are supported at
this point.
ok markus
OpenBSD-Commit-ID: ae2fcde9a22a9ba7f765bd4f36b3f5901d8c3fa7
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binary key revocation list: ssh-keygen -lQf /path bz#3132; ok dtucker
OpenBSD-Commit-ID: b76afc4e3b74ab735dbde4e5f0cfa1f02356033b
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speculation and memory sidechannel attacks like Spectre, Meltdown, Rowhammer
and Rambleed. This change encrypts private keys when they are not in use with
a symmetic key that is derived from a relatively large "prekey" consisting of
random data (currently 16KB).
Attackers must recover the entire prekey with high accuracy before
they can attempt to decrypt the shielded private key, but the current
generation of attacks have bit error rates that, when applied
cumulatively to the entire prekey, make this unlikely.
Implementation-wise, keys are encrypted "shielded" when loaded and then
automatically and transparently unshielded when used for signatures or
when being saved/serialised.
Hopefully we can remove this in a few years time when computer
architecture has become less unsafe.
been in snaps for a bit already; thanks deraadt@
ok dtucker@ deraadt@
OpenBSD-Commit-ID: 19767213c312e46f94b303a512ef8e9218a39bd4
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to create KRLs using SHA256/base64 key fingerprints; ok markus@
OpenBSD-Commit-ID: a0590fd34e7f1141f2873ab3acc57442560e6a94
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unused prototype
Upstream-ID: f3eef4389d53ed6c0d5c77dcdcca3060c745da97
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sync changes from libopenssh; prepared by markus@ mostly
debug output tweaks, a couple of error return value changes and some other
minor stuff
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convert KRL code to new buffer API
ok markus@
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[auth.c key.c key.h ssh-keygen.1 ssh-keygen.c sshd_config.5]
[krl.c krl.h PROTOCOL.krl]
add support for Key Revocation Lists (KRLs). These are a compact way to
represent lists of revoked keys and certificates, taking as little as
a single bit of incremental cost to revoke a certificate by serial number.
KRLs are loaded via the existing RevokedKeys sshd_config option.
feedback and ok markus@
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