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4cfb908054
Add a new link restriction. Restrict the addition of keys in a keyring based on the key having digitalSignature usage set. Additionally, verify the new certificate against the ones in the system keyrings. Add two additional functions to use the new restriction within either the builtin or secondary keyrings. [jarkko@kernel.org: Fix checkpatch.pl --strict issues] Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com> Reviewed-and-tested-by: Mimi Zohar <zohar@linux.ibm.com> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* Asymmetric public-key algorithm definitions
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*
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* See Documentation/crypto/asymmetric-keys.rst
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*
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* Copyright (C) 2012 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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#ifndef _LINUX_PUBLIC_KEY_H
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#define _LINUX_PUBLIC_KEY_H
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#include <linux/keyctl.h>
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#include <linux/oid_registry.h>
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/*
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* Cryptographic data for the public-key subtype of the asymmetric key type.
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*
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* Note that this may include private part of the key as well as the public
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* part.
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*/
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struct public_key {
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void *key;
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u32 keylen;
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enum OID algo;
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void *params;
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u32 paramlen;
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bool key_is_private;
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const char *id_type;
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const char *pkey_algo;
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unsigned long key_eflags; /* key extension flags */
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#define KEY_EFLAG_CA 0 /* set if the CA basic constraints is set */
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#define KEY_EFLAG_DIGITALSIG 1 /* set if the digitalSignature usage is set */
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#define KEY_EFLAG_KEYCERTSIGN 2 /* set if the keyCertSign usage is set */
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};
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extern void public_key_free(struct public_key *key);
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/*
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* Public key cryptography signature data
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*/
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struct public_key_signature {
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struct asymmetric_key_id *auth_ids[3];
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u8 *s; /* Signature */
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u8 *digest;
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u32 s_size; /* Number of bytes in signature */
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u32 digest_size; /* Number of bytes in digest */
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const char *pkey_algo;
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const char *hash_algo;
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const char *encoding;
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};
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extern void public_key_signature_free(struct public_key_signature *sig);
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extern struct asymmetric_key_subtype public_key_subtype;
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struct key;
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struct key_type;
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union key_payload;
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extern int restrict_link_by_signature(struct key *dest_keyring,
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const struct key_type *type,
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const union key_payload *payload,
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struct key *trust_keyring);
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extern int restrict_link_by_key_or_keyring(struct key *dest_keyring,
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const struct key_type *type,
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const union key_payload *payload,
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struct key *trusted);
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extern int restrict_link_by_key_or_keyring_chain(struct key *trust_keyring,
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const struct key_type *type,
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const union key_payload *payload,
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struct key *trusted);
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#if IS_REACHABLE(CONFIG_ASYMMETRIC_KEY_TYPE)
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extern int restrict_link_by_ca(struct key *dest_keyring,
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const struct key_type *type,
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const union key_payload *payload,
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struct key *trust_keyring);
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int restrict_link_by_digsig(struct key *dest_keyring,
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const struct key_type *type,
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const union key_payload *payload,
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struct key *trust_keyring);
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#else
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static inline int restrict_link_by_ca(struct key *dest_keyring,
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const struct key_type *type,
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const union key_payload *payload,
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struct key *trust_keyring)
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{
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return 0;
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}
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static inline int restrict_link_by_digsig(struct key *dest_keyring,
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const struct key_type *type,
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const union key_payload *payload,
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struct key *trust_keyring)
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{
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return 0;
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}
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#endif
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extern int query_asymmetric_key(const struct kernel_pkey_params *,
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struct kernel_pkey_query *);
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extern int encrypt_blob(struct kernel_pkey_params *, const void *, void *);
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extern int decrypt_blob(struct kernel_pkey_params *, const void *, void *);
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extern int create_signature(struct kernel_pkey_params *, const void *, void *);
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extern int verify_signature(const struct key *,
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const struct public_key_signature *);
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#if IS_REACHABLE(CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE)
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int public_key_verify_signature(const struct public_key *pkey,
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const struct public_key_signature *sig);
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#else
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static inline
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int public_key_verify_signature(const struct public_key *pkey,
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const struct public_key_signature *sig)
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{
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return -EINVAL;
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}
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#endif
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#endif /* _LINUX_PUBLIC_KEY_H */
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