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145 lines
3.4 KiB
145 lines
3.4 KiB
/* |
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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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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, version 2 of the License. |
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* |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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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/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 *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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"_module", |
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}; |
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#ifdef CONFIG_INTEGRITY_TRUSTED_KEYRING |
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static bool init_keyring __initdata = true; |
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#else |
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static bool init_keyring __initdata; |
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#endif |
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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_builtin_and_secondary_trusted |
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#else |
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#define restrict_link_to_ima restrict_link_by_builtin_trusted |
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#endif |
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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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if (id >= INTEGRITY_KEYRING_MAX || siglen < 2) |
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return -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; |
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} |
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} |
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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[id], sig + 1, siglen - 1, |
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digest, digestlen); |
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case 2: |
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return asymmetric_verify(keyring[id], sig, siglen, |
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digest, digestlen); |
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} |
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return -EOPNOTSUPP; |
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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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const struct cred *cred = current_cred(); |
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struct key_restriction *restriction; |
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int err = 0; |
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if (!init_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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restriction->check = restrict_link_to_ima; |
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keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0), |
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KGIDT_INIT(0), cred, |
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((KEY_POS_ALL & ~KEY_POS_SETATTR) | |
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KEY_USR_VIEW | KEY_USR_READ | |
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KEY_USR_WRITE | KEY_USR_SEARCH), |
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KEY_ALLOC_NOT_IN_QUOTA, |
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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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} |
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return err; |
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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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key_ref_t key; |
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char *data; |
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int rc; |
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if (!keyring[id]) |
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return -EINVAL; |
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rc = integrity_read_file(path, &data); |
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if (rc < 0) |
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return rc; |
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key = key_create_or_update(make_key_ref(keyring[id], 1), |
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"asymmetric", |
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NULL, |
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data, |
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rc, |
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((KEY_POS_ALL & ~KEY_POS_SETATTR) | |
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KEY_USR_VIEW | KEY_USR_READ), |
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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): %s\n", |
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rc, path); |
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} else { |
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pr_notice("Loaded X.509 cert '%s': %s\n", |
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key_ref_to_ptr(key)->description, path); |
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key_ref_put(key); |
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} |
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kfree(data); |
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return 0; |
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}
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