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author | David Howells <dhowells@redhat.com> | 2006-06-29 02:24:28 -0700 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-29 10:26:20 -0700 |
commit | 4e54f08543d05e519e601368571cc3787fefae96 (patch) | |
tree | 0cd9d982e5bb25abcb9251d26c36ff11e7dc81a5 /Documentation/keys.txt | |
parent | 94583779e6625154e8d7fce33d097ae7d089e9de (diff) | |
download | linux-4e54f08543d05e519e601368571cc3787fefae96.tar.gz linux-4e54f08543d05e519e601368571cc3787fefae96.tar.xz |
[PATCH] Keys: Allow in-kernel key requestor to pass auxiliary data to upcaller
The proposed NFS key type uses its own method of passing key requests to
userspace (upcalling) rather than invoking /sbin/request-key. This is
because the responsible userspace daemon should already be running and will
be contacted through rpc_pipefs.
This patch permits the NFS filesystem to pass auxiliary data to the upcall
operation (struct key_type::request_key) so that the upcaller can use a
pre-existing communications channel more easily.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-By: Kevin Coffman <kwc@citi.umich.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation/keys.txt')
-rw-r--r-- | Documentation/keys.txt | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/Documentation/keys.txt b/Documentation/keys.txt index 61c0fad2fe2f..e373f0212843 100644 --- a/Documentation/keys.txt +++ b/Documentation/keys.txt @@ -780,6 +780,17 @@ payload contents" for more information. See also Documentation/keys-request-key.txt. +(*) To search for a key, passing auxiliary data to the upcaller, call: + + struct key *request_key_with_auxdata(const struct key_type *type, + const char *description, + const char *callout_string, + void *aux); + + This is identical to request_key(), except that the auxiliary data is + passed to the key_type->request_key() op if it exists. + + (*) When it is no longer required, the key should be released using: void key_put(struct key *key); @@ -1031,6 +1042,24 @@ The structure has a number of fields, some of which are mandatory: as might happen when the userspace buffer is accessed. + (*) int (*request_key)(struct key *key, struct key *authkey, const char *op, + void *aux); + + This method is optional. If provided, request_key() and + request_key_with_auxdata() will invoke this function rather than + upcalling to /sbin/request-key to operate upon a key of this type. + + The aux parameter is as passed to request_key_with_auxdata() or is NULL + otherwise. Also passed are the key to be operated upon, the + authorisation key for this operation and the operation type (currently + only "create"). + + This function should return only when the upcall is complete. Upon return + the authorisation key will be revoked, and the target key will be + negatively instantiated if it is still uninstantiated. The error will be + returned to the caller of request_key*(). + + ============================ REQUEST-KEY CALLBACK SERVICE ============================ |