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authorJeff Layton <jlayton@redhat.com>2012-04-25 20:46:50 +0400
committerJeff Layton <jlayton@redhat.com>2012-04-25 20:46:50 +0400
commita05a4830a32ef9f89e7bd372a7bae9b96b1ac266 (patch)
tree04e3383340b422753f0db87cad61919ce54335fa /Documentation/security
parentaf3a3ab2966112c0d0a44df7eeb1e95fe32d4495 (diff)
downloadlinux-a05a4830a32ef9f89e7bd372a7bae9b96b1ac266.tar.xz
keys: update the documentation with info about "logon" keys
Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Jeff Layton <jlayton@redhat.com>
Diffstat (limited to 'Documentation/security')
-rw-r--r--Documentation/security/keys.txt14
1 files changed, 13 insertions, 1 deletions
diff --git a/Documentation/security/keys.txt b/Documentation/security/keys.txt
index 787717091421..d389acd31e19 100644
--- a/Documentation/security/keys.txt
+++ b/Documentation/security/keys.txt
@@ -123,7 +123,7 @@ KEY SERVICE OVERVIEW
The key service provides a number of features besides keys:
- (*) The key service defines two special key types:
+ (*) The key service defines three special key types:
(+) "keyring"
@@ -137,6 +137,18 @@ The key service provides a number of features besides keys:
blobs of data. These can be created, updated and read by userspace,
and aren't intended for use by kernel services.
+ (+) "logon"
+
+ Like a "user" key, a "logon" key has a payload that is an arbitrary
+ blob of data. It is intended as a place to store secrets which are
+ accessible to the kernel but not to userspace programs.
+
+ The description can be arbitrary, but must be prefixed with a non-zero
+ length string that describes the key "subclass". The subclass is
+ separated from the rest of the description by a ':'. "logon" keys can
+ be created and updated from userspace, but the payload is only
+ readable from kernel space.
+
(*) Each process subscribes to three keyrings: a thread-specific keyring, a
process-specific keyring, and a session-specific keyring.