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trust_moklist() is specific to UEFI enabled systems. Other platforms rely only on the Kconfig. Define a generic wrapper named imputed_trust_enabled(). Signed-off-by: Nayna Jain <nayna@linux.ibm.com> Reviewed-by: Mimi Zohar <zohar@linux.ibm.com> Tested-by: Nageswara R Sastry <rnsastry@linux.ibm.com> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
226 lines
5.3 KiB
C
226 lines
5.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2011 Intel Corporation
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*
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* Author:
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* Dmitry Kasatkin <dmitry.kasatkin@intel.com>
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*/
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#include <linux/err.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/cred.h>
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#include <linux/kernel_read_file.h>
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#include <linux/key-type.h>
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#include <linux/digsig.h>
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#include <linux/vmalloc.h>
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#include <crypto/public_key.h>
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#include <keys/system_keyring.h>
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#include "integrity.h"
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static struct key *keyring[INTEGRITY_KEYRING_MAX];
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static const char * const keyring_name[INTEGRITY_KEYRING_MAX] = {
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#ifndef CONFIG_INTEGRITY_TRUSTED_KEYRING
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"_evm",
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"_ima",
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#else
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".evm",
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".ima",
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#endif
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".platform",
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".machine",
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};
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#ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
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#define restrict_link_to_ima restrict_link_by_digsig_builtin_and_secondary
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#else
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#define restrict_link_to_ima restrict_link_by_digsig_builtin
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#endif
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static struct key *integrity_keyring_from_id(const unsigned int id)
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{
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if (id >= INTEGRITY_KEYRING_MAX)
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return ERR_PTR(-EINVAL);
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if (!keyring[id]) {
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keyring[id] =
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request_key(&key_type_keyring, keyring_name[id], NULL);
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if (IS_ERR(keyring[id])) {
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int err = PTR_ERR(keyring[id]);
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pr_err("no %s keyring: %d\n", keyring_name[id], err);
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keyring[id] = NULL;
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return ERR_PTR(err);
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}
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}
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return keyring[id];
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}
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int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
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const char *digest, int digestlen)
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{
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struct key *keyring;
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if (siglen < 2)
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return -EINVAL;
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keyring = integrity_keyring_from_id(id);
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if (IS_ERR(keyring))
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return PTR_ERR(keyring);
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switch (sig[1]) {
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case 1:
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/* v1 API expect signature without xattr type */
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return digsig_verify(keyring, sig + 1, siglen - 1, digest,
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digestlen);
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case 2: /* regular file data hash based signature */
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case 3: /* struct ima_file_id data based signature */
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return asymmetric_verify(keyring, sig, siglen, digest,
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digestlen);
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}
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return -EOPNOTSUPP;
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}
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int integrity_modsig_verify(const unsigned int id, const struct modsig *modsig)
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{
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struct key *keyring;
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keyring = integrity_keyring_from_id(id);
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if (IS_ERR(keyring))
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return PTR_ERR(keyring);
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return ima_modsig_verify(keyring, modsig);
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}
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static int __init __integrity_init_keyring(const unsigned int id,
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key_perm_t perm,
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struct key_restriction *restriction)
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{
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const struct cred *cred = current_cred();
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int err = 0;
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keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0),
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KGIDT_INIT(0), cred, perm,
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KEY_ALLOC_NOT_IN_QUOTA, restriction, NULL);
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if (IS_ERR(keyring[id])) {
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err = PTR_ERR(keyring[id]);
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pr_info("Can't allocate %s keyring (%d)\n",
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keyring_name[id], err);
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keyring[id] = NULL;
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} else {
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if (id == INTEGRITY_KEYRING_PLATFORM)
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set_platform_trusted_keys(keyring[id]);
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if (id == INTEGRITY_KEYRING_MACHINE && imputed_trust_enabled())
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set_machine_trusted_keys(keyring[id]);
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if (id == INTEGRITY_KEYRING_IMA)
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load_module_cert(keyring[id]);
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}
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return err;
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}
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int __init integrity_init_keyring(const unsigned int id)
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{
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struct key_restriction *restriction;
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key_perm_t perm;
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int ret;
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perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW
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| KEY_USR_READ | KEY_USR_SEARCH;
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if (id == INTEGRITY_KEYRING_PLATFORM ||
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(id == INTEGRITY_KEYRING_MACHINE &&
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!IS_ENABLED(CONFIG_INTEGRITY_CA_MACHINE_KEYRING))) {
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restriction = NULL;
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goto out;
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}
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if (!IS_ENABLED(CONFIG_INTEGRITY_TRUSTED_KEYRING))
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return 0;
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restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL);
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if (!restriction)
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return -ENOMEM;
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if (id == INTEGRITY_KEYRING_MACHINE)
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restriction->check = restrict_link_by_ca;
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else
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restriction->check = restrict_link_to_ima;
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/*
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* MOK keys can only be added through a read-only runtime services
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* UEFI variable during boot. No additional keys shall be allowed to
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* load into the machine keyring following init from userspace.
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*/
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if (id != INTEGRITY_KEYRING_MACHINE)
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perm |= KEY_USR_WRITE;
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out:
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ret = __integrity_init_keyring(id, perm, restriction);
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if (ret)
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kfree(restriction);
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return ret;
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}
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static int __init integrity_add_key(const unsigned int id, const void *data,
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off_t size, key_perm_t perm)
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{
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key_ref_t key;
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int rc = 0;
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if (!keyring[id])
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return -EINVAL;
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key = key_create_or_update(make_key_ref(keyring[id], 1), "asymmetric",
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NULL, data, size, perm,
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KEY_ALLOC_NOT_IN_QUOTA);
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if (IS_ERR(key)) {
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rc = PTR_ERR(key);
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pr_err("Problem loading X.509 certificate %d\n", rc);
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} else {
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pr_notice("Loaded X.509 cert '%s'\n",
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key_ref_to_ptr(key)->description);
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key_ref_put(key);
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}
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return rc;
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}
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int __init integrity_load_x509(const unsigned int id, const char *path)
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{
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void *data = NULL;
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size_t size;
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int rc;
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key_perm_t perm;
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rc = kernel_read_file_from_path(path, 0, &data, INT_MAX, NULL,
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READING_X509_CERTIFICATE);
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if (rc < 0) {
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pr_err("Unable to open file: %s (%d)", path, rc);
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return rc;
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}
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size = rc;
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perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | KEY_USR_READ;
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pr_info("Loading X.509 certificate: %s\n", path);
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rc = integrity_add_key(id, (const void *)data, size, perm);
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vfree(data);
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return rc;
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}
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int __init integrity_load_cert(const unsigned int id, const char *source,
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const void *data, size_t len, key_perm_t perm)
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{
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if (!data)
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return -EINVAL;
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pr_info("Loading X.509 certificate: %s\n", source);
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return integrity_add_key(id, data, len, perm);
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}
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