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Applications in Plan 9 that use public keys for authentication,
for example by calling tlsClient and okThumbprint (see pushtls(3)),
check the remote side’s public key by comparing against thumbprints
from a trusted list. The list is maintained by people who set
local policies about which servers can be trusted for which applications,
thereby playing
the role taken by certificate authorities in PKI-based systems.
By convention, these lists are stored as files in /sys/lib/tls/
and protected by normal file system permissions.
Such a thumbprint file comprises lines made up of attribute/value
pairs of the form attr=value or attr. The first attribute must
be x509 and the second must be sha1={hexchecksumofbinarycertificate}.
All other attributes are treated as comments. The file may also
contain lines of the form #includefile
For example, a web server might have thumbprint
x509 sha1=8fe472d31b360a8303cd29f92bd734813cbd923c cn=*.cs.bell−labs.com
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