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00d60fd3b9
Provide five keyctl functions that permit userspace to make use of the new
key type ops for accessing and driving asymmetric keys.
(*) Query an asymmetric key.
long keyctl(KEYCTL_PKEY_QUERY,
key_serial_t key, unsigned long reserved,
struct keyctl_pkey_query *info);
Get information about an asymmetric key. The information is returned
in the keyctl_pkey_query struct:
__u32 supported_ops;
A bit mask of flags indicating which ops are supported. This is
constructed from a bitwise-OR of:
KEYCTL_SUPPORTS_{ENCRYPT,DECRYPT,SIGN,VERIFY}
__u32 key_size;
The size in bits of the key.
__u16 max_data_size;
__u16 max_sig_size;
__u16 max_enc_size;
__u16 max_dec_size;
The maximum sizes in bytes of a blob of data to be signed, a signature
blob, a blob to be encrypted and a blob to be decrypted.
reserved must be set to 0. This is intended for future use to hand
over one or more passphrases needed unlock a key.
If successful, 0 is returned. If the key is not an asymmetric key,
EOPNOTSUPP is returned.
(*) Encrypt, decrypt, sign or verify a blob using an asymmetric key.
long keyctl(KEYCTL_PKEY_ENCRYPT,
const struct keyctl_pkey_params *params,
const char *info,
const void *in,
void *out);
long keyctl(KEYCTL_PKEY_DECRYPT,
const struct keyctl_pkey_params *params,
const char *info,
const void *in,
void *out);
long keyctl(KEYCTL_PKEY_SIGN,
const struct keyctl_pkey_params *params,
const char *info,
const void *in,
void *out);
long keyctl(KEYCTL_PKEY_VERIFY,
const struct keyctl_pkey_params *params,
const char *info,
const void *in,
const void *in2);
Use an asymmetric key to perform a public-key cryptographic operation
a blob of data.
The parameter block pointed to by params contains a number of integer
values:
__s32 key_id;
__u32 in_len;
__u32 out_len;
__u32 in2_len;
For a given operation, the in and out buffers are used as follows:
Operation ID in,in_len out,out_len in2,in2_len
======================= =============== =============== ===========
KEYCTL_PKEY_ENCRYPT Raw data Encrypted data -
KEYCTL_PKEY_DECRYPT Encrypted data Raw data -
KEYCTL_PKEY_SIGN Raw data Signature -
KEYCTL_PKEY_VERIFY Raw data - Signature
info is a string of key=value pairs that supply supplementary
information.
The __spare space in the parameter block must be set to 0. This is
intended, amongst other things, to allow the passing of passphrases
required to unlock a key.
If successful, encrypt, decrypt and sign all return the amount of data
written into the output buffer. Verification returns 0 on success.
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Marcel Holtmann <marcel@holtmann.org>
Reviewed-by: Marcel Holtmann <marcel@holtmann.org>
Reviewed-by: Denis Kenzior <denkenz@gmail.com>
Tested-by: Denis Kenzior <denkenz@gmail.com>
Signed-off-by: James Morris <james.morris@microsoft.com>
116 lines
4.6 KiB
C
116 lines
4.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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/* keyctl.h: keyctl command IDs
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*
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* Copyright (C) 2004, 2008 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _LINUX_KEYCTL_H
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#define _LINUX_KEYCTL_H
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#include <linux/types.h>
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/* special process keyring shortcut IDs */
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#define KEY_SPEC_THREAD_KEYRING -1 /* - key ID for thread-specific keyring */
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#define KEY_SPEC_PROCESS_KEYRING -2 /* - key ID for process-specific keyring */
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#define KEY_SPEC_SESSION_KEYRING -3 /* - key ID for session-specific keyring */
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#define KEY_SPEC_USER_KEYRING -4 /* - key ID for UID-specific keyring */
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#define KEY_SPEC_USER_SESSION_KEYRING -5 /* - key ID for UID-session keyring */
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#define KEY_SPEC_GROUP_KEYRING -6 /* - key ID for GID-specific keyring */
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#define KEY_SPEC_REQKEY_AUTH_KEY -7 /* - key ID for assumed request_key auth key */
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#define KEY_SPEC_REQUESTOR_KEYRING -8 /* - key ID for request_key() dest keyring */
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/* request-key default keyrings */
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#define KEY_REQKEY_DEFL_NO_CHANGE -1
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#define KEY_REQKEY_DEFL_DEFAULT 0
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#define KEY_REQKEY_DEFL_THREAD_KEYRING 1
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#define KEY_REQKEY_DEFL_PROCESS_KEYRING 2
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#define KEY_REQKEY_DEFL_SESSION_KEYRING 3
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#define KEY_REQKEY_DEFL_USER_KEYRING 4
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#define KEY_REQKEY_DEFL_USER_SESSION_KEYRING 5
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#define KEY_REQKEY_DEFL_GROUP_KEYRING 6
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#define KEY_REQKEY_DEFL_REQUESTOR_KEYRING 7
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/* keyctl commands */
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#define KEYCTL_GET_KEYRING_ID 0 /* ask for a keyring's ID */
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#define KEYCTL_JOIN_SESSION_KEYRING 1 /* join or start named session keyring */
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#define KEYCTL_UPDATE 2 /* update a key */
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#define KEYCTL_REVOKE 3 /* revoke a key */
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#define KEYCTL_CHOWN 4 /* set ownership of a key */
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#define KEYCTL_SETPERM 5 /* set perms on a key */
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#define KEYCTL_DESCRIBE 6 /* describe a key */
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#define KEYCTL_CLEAR 7 /* clear contents of a keyring */
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#define KEYCTL_LINK 8 /* link a key into a keyring */
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#define KEYCTL_UNLINK 9 /* unlink a key from a keyring */
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#define KEYCTL_SEARCH 10 /* search for a key in a keyring */
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#define KEYCTL_READ 11 /* read a key or keyring's contents */
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#define KEYCTL_INSTANTIATE 12 /* instantiate a partially constructed key */
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#define KEYCTL_NEGATE 13 /* negate a partially constructed key */
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#define KEYCTL_SET_REQKEY_KEYRING 14 /* set default request-key keyring */
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#define KEYCTL_SET_TIMEOUT 15 /* set key timeout */
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#define KEYCTL_ASSUME_AUTHORITY 16 /* assume request_key() authorisation */
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#define KEYCTL_GET_SECURITY 17 /* get key security label */
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#define KEYCTL_SESSION_TO_PARENT 18 /* apply session keyring to parent process */
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#define KEYCTL_REJECT 19 /* reject a partially constructed key */
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#define KEYCTL_INSTANTIATE_IOV 20 /* instantiate a partially constructed key */
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#define KEYCTL_INVALIDATE 21 /* invalidate a key */
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#define KEYCTL_GET_PERSISTENT 22 /* get a user's persistent keyring */
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#define KEYCTL_DH_COMPUTE 23 /* Compute Diffie-Hellman values */
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#define KEYCTL_PKEY_QUERY 24 /* Query public key parameters */
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#define KEYCTL_PKEY_ENCRYPT 25 /* Encrypt a blob using a public key */
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#define KEYCTL_PKEY_DECRYPT 26 /* Decrypt a blob using a public key */
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#define KEYCTL_PKEY_SIGN 27 /* Create a public key signature */
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#define KEYCTL_PKEY_VERIFY 28 /* Verify a public key signature */
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#define KEYCTL_RESTRICT_KEYRING 29 /* Restrict keys allowed to link to a keyring */
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/* keyctl structures */
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struct keyctl_dh_params {
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union {
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#ifndef __cplusplus
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__s32 private;
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#endif
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__s32 priv;
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};
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__s32 prime;
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__s32 base;
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};
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struct keyctl_kdf_params {
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char __user *hashname;
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char __user *otherinfo;
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__u32 otherinfolen;
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__u32 __spare[8];
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};
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#define KEYCTL_SUPPORTS_ENCRYPT 0x01
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#define KEYCTL_SUPPORTS_DECRYPT 0x02
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#define KEYCTL_SUPPORTS_SIGN 0x04
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#define KEYCTL_SUPPORTS_VERIFY 0x08
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struct keyctl_pkey_query {
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__u32 supported_ops; /* Which ops are supported */
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__u32 key_size; /* Size of the key in bits */
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__u16 max_data_size; /* Maximum size of raw data to sign in bytes */
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__u16 max_sig_size; /* Maximum size of signature in bytes */
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__u16 max_enc_size; /* Maximum size of encrypted blob in bytes */
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__u16 max_dec_size; /* Maximum size of decrypted blob in bytes */
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__u32 __spare[10];
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};
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struct keyctl_pkey_params {
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__s32 key_id; /* Serial no. of public key to use */
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__u32 in_len; /* Input data size */
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union {
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__u32 out_len; /* Output buffer size (encrypt/decrypt/sign) */
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__u32 in2_len; /* 2nd input data size (verify) */
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};
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__u32 __spare[7];
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};
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#endif /* _LINUX_KEYCTL_H */
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