2 .\" Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
3 .\" Written by David Howells (dhowells@redhat.com)
5 .\" This program is free software; you can redistribute it and/or
6 .\" modify it under the terms of the GNU General Public License
7 .\" as published by the Free Software Foundation; either version
8 .\" 2 of the License, or (at your option) any later version.
10 .TH ADD_KEY 2 2010-02-25 Linux "Linux Key Management Calls"
12 add_key \- Add a key to the kernel's key management facility
15 .B #include <keyutils.h>
17 .BI "key_serial_t add_key(const char *" type ", const char *" description ,
18 .BI " const void *" payload ", size_t " plen ,
19 .BI " key_serial_t " keyring ");"
23 asks the kernel to create or update a key of the given
27 instantiate it with the
31 and to attach it to the nominated
33 and to return its serial number.
35 The key type may reject the data if it's in the wrong format or in some other
40 already contains a key that matches the specified
41 .IR type " and " description
42 then, if the key type supports it, that key will be updated rather than a new
43 key being created; if not, a new key will be created and it will displace the
44 link to the extant key from the keyring.
48 serial number may be that of a valid keyring to which the caller has write
49 permission, or it may be a special keyring ID:
51 .B KEY_SPEC_THREAD_KEYRING
52 This specifies the caller's thread-specific keyring.
54 .B KEY_SPEC_PROCESS_KEYRING
55 This specifies the caller's process-specific keyring.
57 .B KEY_SPEC_SESSION_KEYRING
58 This specifies the caller's session-specific keyring.
60 .B KEY_SPEC_USER_KEYRING
61 This specifies the caller's UID-specific keyring.
63 .B KEY_SPEC_USER_SESSION_KEYRING
64 This specifies the caller's UID-session keyring.
66 There are a number of key types available in the core key management code, and
67 these can be specified to this function:
70 Keys of the user-defined key type may contain a blob of arbitrary data, and the
72 may be any valid string, though it is preferred that the description be
73 prefixed with a string representing the service to which the key is of interest
74 and a colon (for instance
75 .RB \*(lq afs:mykey \*(rq).
80 for keys of this type.
83 Keyrings are special key types that may contain links to sequences of other
84 keys of any type. If this interface is used to create a keyring, then a
87 should be specified, and
93 returns the serial number of the key it created or updated.
96 will be returned and errno will have been set to an appropriate error.
100 The keyring doesn't exist.
103 The keyring has expired.
106 The keyring has been revoked.
109 The payload data was invalid.
112 Insufficient memory to create a key.
115 The key quota for this user would be exceeded by creating this key or linking
119 The keyring wasn't available for modification by the user.
121 Although this is a Linux system call, it is not present in
123 but can be found rather in
127 should be specified to the linker.