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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (C) 2011 Intel Corporation * * Author: * Dmitry Kasatkin <dmitry.kasatkin@intel.com> */
#include <linux/err.h>#include <linux/sched.h>#include <linux/slab.h>#include <linux/cred.h>#include <linux/kernel_read_file.h>#include <linux/key-type.h>#include <linux/digsig.h>#include <linux/vmalloc.h>#include <crypto/public_key.h>#include <keys/system_keyring.h>
#include "integrity.h"
static struct key *keyring[INTEGRITY_KEYRING_MAX];
static const char * const keyring_name[INTEGRITY_KEYRING_MAX] = {#ifndef CONFIG_INTEGRITY_TRUSTED_KEYRING "_evm", "_ima",#else ".evm", ".ima",#endif ".platform", ".machine",};
#ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY#define restrict_link_to_ima restrict_link_by_digsig_builtin_and_secondary#else#define restrict_link_to_ima restrict_link_by_digsig_builtin#endif
static struct key *integrity_keyring_from_id(const unsigned int id){ if (id >= INTEGRITY_KEYRING_MAX) return ERR_PTR(-EINVAL);
if (!keyring[id]) { keyring[id] = request_key(&key_type_keyring, keyring_name[id], NULL); if (IS_ERR(keyring[id])) { int err = PTR_ERR(keyring[id]); pr_err("no %s keyring: %d\n", keyring_name[id], err); keyring[id] = NULL; return ERR_PTR(err); } }
return keyring[id];}
int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, const char *digest, int digestlen, u8 algo){ struct key *keyring;
if (siglen < 2) return -EINVAL;
keyring = integrity_keyring_from_id(id); if (IS_ERR(keyring)) return PTR_ERR(keyring);
switch (sig[1]) { case 1: /* v1 API expect signature without xattr type */ return digsig_verify(keyring, sig + 1, siglen - 1, digest, digestlen); case 2: /* regular file data hash based signature */ return asymmetric_verify(keyring, sig, siglen, digest, digestlen); case 3: /* struct ima_file_id data based signature */ return asymmetric_verify_v3(keyring, sig, siglen, digest, digestlen, algo); }
return -EOPNOTSUPP;}
int integrity_modsig_verify(const unsigned int id, const struct modsig *modsig){ struct key *keyring;
keyring = integrity_keyring_from_id(id); if (IS_ERR(keyring)) return PTR_ERR(keyring);
return ima_modsig_verify(keyring, modsig);}
static int __init __integrity_init_keyring(const unsigned int id, key_perm_t perm, struct key_restriction *restriction){ const struct cred *cred = current_cred(); int err = 0;
keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0), KGIDT_INIT(0), cred, perm, KEY_ALLOC_NOT_IN_QUOTA, restriction, NULL); if (IS_ERR(keyring[id])) { err = PTR_ERR(keyring[id]); pr_info("Can't allocate %s keyring (%d)\n", keyring_name[id], err); keyring[id] = NULL; } else { if (id == INTEGRITY_KEYRING_PLATFORM) set_platform_trusted_keys(keyring[id]); if (id == INTEGRITY_KEYRING_MACHINE && imputed_trust_enabled()) set_machine_trusted_keys(keyring[id]); if (id == INTEGRITY_KEYRING_IMA) load_module_cert(keyring[id]); }
return err;}
int __init integrity_init_keyring(const unsigned int id){ struct key_restriction *restriction; key_perm_t perm; int ret;
perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH;
if (id == INTEGRITY_KEYRING_PLATFORM || (id == INTEGRITY_KEYRING_MACHINE && !IS_ENABLED(CONFIG_INTEGRITY_CA_MACHINE_KEYRING))) { restriction = NULL; goto out; }
if (!IS_ENABLED(CONFIG_INTEGRITY_TRUSTED_KEYRING)) return 0;
restriction = kzalloc_obj(struct key_restriction); if (!restriction) return -ENOMEM;
if (id == INTEGRITY_KEYRING_MACHINE) restriction->check = restrict_link_by_ca; else restriction->check = restrict_link_to_ima;
/* * MOK keys can only be added through a read-only runtime services * UEFI variable during boot. No additional keys shall be allowed to * load into the machine keyring following init from userspace. */ if (id != INTEGRITY_KEYRING_MACHINE) perm |= KEY_USR_WRITE;
out: ret = __integrity_init_keyring(id, perm, restriction); if (ret) kfree(restriction); return ret;}
static int __init integrity_add_key(const unsigned int id, const void *data, off_t size, key_perm_t perm){ key_ref_t key; int rc = 0;
if (!keyring[id]) return -EINVAL;
key = key_create_or_update(make_key_ref(keyring[id], 1), "asymmetric", NULL, data, size, perm, KEY_ALLOC_NOT_IN_QUOTA); if (IS_ERR(key)) { rc = PTR_ERR(key); if (id != INTEGRITY_KEYRING_MACHINE) pr_err("Problem loading X.509 certificate %d\n", rc); } else { pr_notice("Loaded X.509 cert '%s'\n", key_ref_to_ptr(key)->description); key_ref_put(key); }
return rc;
}
int __init integrity_load_x509(const unsigned int id, const char *path){ void *data = NULL; size_t size; int rc; key_perm_t perm;
rc = kernel_read_file_from_path(path, 0, &data, INT_MAX, NULL, READING_X509_CERTIFICATE); if (rc < 0) { pr_err("Unable to open file: %s (%d)", path, rc); return rc; } size = rc;
perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | KEY_USR_READ;
pr_info("Loading X.509 certificate: %s\n", path); rc = integrity_add_key(id, (const void *)data, size, perm);
vfree(data); return rc;}
int __init integrity_load_cert(const unsigned int id, const char *source, const void *data, size_t len, key_perm_t perm){ if (!data) return -EINVAL;
pr_info("Loading X.509 certificate: %s\n", source); return integrity_add_key(id, data, len, perm);}