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add_key.2: Further improve description of "user" and "logon" keys 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2016-10-27 12:58:18 +02:00
parent 7b79153974
commit 37ab86d7d4
1 changed files with 11 additions and 5 deletions
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16
man2/add_key.2
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@ -88,11 +88,14 @@ argument to
.BR add_key ():
.TP
.IR """user"""
Keys of the user-defined key type may contain a blob of arbitrary data, and the
The payload for keys of this type is a blob of arbitrary data
of up to 32,767 bytes.
The
.I description
may be any valid string, though it is preferred that the description be
prefixed with a string representing the service to which the key is of interest
and a colon (for instance
may be any valid string, though it is preferred that it
start with a colon-delimited prefix representing the service
to which the key is of interest
(for instance
.IR """afs:mykey""" ).
.TP
.I """keyring"""
@ -108,7 +111,10 @@ should be zero.
.\" commit 9f6ed2ca257fa8650b876377833e6f14e272848b
This key type is essentially the same as
.IR """user""" ,
but does not provide a read operation,
but does not provide reading (i.e., the
.BR keyctl (2)
.BR KEYCTL_READ
operation),
meaning that the key payload is never visible from user space.
This is suitable for storing username and password pairs in the keyring
that you do not want to be readable from user space.