Dmitry Kasatkin | 8607c50 | 2011-10-05 11:54:46 +0300 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 Intel Corporation |
| 3 | * |
| 4 | * Author: |
| 5 | * Dmitry Kasatkin <dmitry.kasatkin@intel.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation, version 2 of the License. |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 14 | |
| 15 | #include <linux/err.h> |
Mimi Zohar | 7d2ce23 | 2013-08-13 08:47:43 -0400 | [diff] [blame] | 16 | #include <linux/sched.h> |
Dmitry Kasatkin | 65d543b | 2014-11-05 17:01:13 +0200 | [diff] [blame] | 17 | #include <linux/slab.h> |
Mimi Zohar | 7d2ce23 | 2013-08-13 08:47:43 -0400 | [diff] [blame] | 18 | #include <linux/cred.h> |
Dmitry Kasatkin | 8607c50 | 2011-10-05 11:54:46 +0300 | [diff] [blame] | 19 | #include <linux/key-type.h> |
| 20 | #include <linux/digsig.h> |
David Howells | a511e1a | 2016-04-06 16:14:26 +0100 | [diff] [blame] | 21 | #include <crypto/public_key.h> |
| 22 | #include <keys/system_keyring.h> |
Dmitry Kasatkin | 8607c50 | 2011-10-05 11:54:46 +0300 | [diff] [blame] | 23 | |
| 24 | #include "integrity.h" |
| 25 | |
| 26 | static struct key *keyring[INTEGRITY_KEYRING_MAX]; |
| 27 | |
| 28 | static const char *keyring_name[INTEGRITY_KEYRING_MAX] = { |
Dmitry Kasatkin | f4dc377 | 2015-10-22 21:26:10 +0300 | [diff] [blame] | 29 | #ifndef CONFIG_INTEGRITY_TRUSTED_KEYRING |
Dmitry Kasatkin | 8607c50 | 2011-10-05 11:54:46 +0300 | [diff] [blame] | 30 | "_evm", |
Dmitry Kasatkin | 8607c50 | 2011-10-05 11:54:46 +0300 | [diff] [blame] | 31 | "_ima", |
Mimi Zohar | 7d2ce23 | 2013-08-13 08:47:43 -0400 | [diff] [blame] | 32 | #else |
Dmitry Kasatkin | f4dc377 | 2015-10-22 21:26:10 +0300 | [diff] [blame] | 33 | ".evm", |
Mimi Zohar | 7d2ce23 | 2013-08-13 08:47:43 -0400 | [diff] [blame] | 34 | ".ima", |
| 35 | #endif |
Dmitry Kasatkin | f4dc377 | 2015-10-22 21:26:10 +0300 | [diff] [blame] | 36 | "_module", |
Dmitry Kasatkin | 8607c50 | 2011-10-05 11:54:46 +0300 | [diff] [blame] | 37 | }; |
| 38 | |
Dmitry Kasatkin | f4dc377 | 2015-10-22 21:26:10 +0300 | [diff] [blame] | 39 | #ifdef CONFIG_INTEGRITY_TRUSTED_KEYRING |
| 40 | static bool init_keyring __initdata = true; |
| 41 | #else |
| 42 | static bool init_keyring __initdata; |
| 43 | #endif |
| 44 | |
David Howells | 56104cf | 2016-04-07 09:45:23 +0100 | [diff] [blame] | 45 | #ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY |
| 46 | #define restrict_link_to_ima restrict_link_by_builtin_and_secondary_trusted |
David Howells | a511e1a | 2016-04-06 16:14:26 +0100 | [diff] [blame] | 47 | #else |
David Howells | 56104cf | 2016-04-07 09:45:23 +0100 | [diff] [blame] | 48 | #define restrict_link_to_ima restrict_link_by_builtin_trusted |
David Howells | a511e1a | 2016-04-06 16:14:26 +0100 | [diff] [blame] | 49 | #endif |
| 50 | |
Dmitry Kasatkin | 8607c50 | 2011-10-05 11:54:46 +0300 | [diff] [blame] | 51 | int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, |
Dmitry Kasatkin | 089bc8e | 2013-10-10 15:56:13 +0900 | [diff] [blame] | 52 | const char *digest, int digestlen) |
Dmitry Kasatkin | 8607c50 | 2011-10-05 11:54:46 +0300 | [diff] [blame] | 53 | { |
Seth Forshee | b4bfec7 | 2016-08-01 08:19:10 -0500 | [diff] [blame] | 54 | if (id >= INTEGRITY_KEYRING_MAX || siglen < 2) |
Dmitry Kasatkin | 8607c50 | 2011-10-05 11:54:46 +0300 | [diff] [blame] | 55 | return -EINVAL; |
| 56 | |
| 57 | if (!keyring[id]) { |
| 58 | keyring[id] = |
Linus Torvalds | 34ef7bd | 2013-11-23 16:36:35 -0800 | [diff] [blame] | 59 | request_key(&key_type_keyring, keyring_name[id], NULL); |
Dmitry Kasatkin | 8607c50 | 2011-10-05 11:54:46 +0300 | [diff] [blame] | 60 | if (IS_ERR(keyring[id])) { |
| 61 | int err = PTR_ERR(keyring[id]); |
| 62 | pr_err("no %s keyring: %d\n", keyring_name[id], err); |
| 63 | keyring[id] = NULL; |
| 64 | return err; |
| 65 | } |
| 66 | } |
| 67 | |
Dmitry Kasatkin | b1aaab2 | 2013-10-10 16:12:03 +0900 | [diff] [blame] | 68 | switch (sig[1]) { |
Dmitry Kasatkin | e075125 | 2013-02-07 00:12:08 +0200 | [diff] [blame] | 69 | case 1: |
Dmitry Kasatkin | b1aaab2 | 2013-10-10 16:12:03 +0900 | [diff] [blame] | 70 | /* v1 API expect signature without xattr type */ |
| 71 | return digsig_verify(keyring[id], sig + 1, siglen - 1, |
Dmitry Kasatkin | e075125 | 2013-02-07 00:12:08 +0200 | [diff] [blame] | 72 | digest, digestlen); |
| 73 | case 2: |
| 74 | return asymmetric_verify(keyring[id], sig, siglen, |
| 75 | digest, digestlen); |
| 76 | } |
| 77 | |
| 78 | return -EOPNOTSUPP; |
Dmitry Kasatkin | 8607c50 | 2011-10-05 11:54:46 +0300 | [diff] [blame] | 79 | } |
Mimi Zohar | 7d2ce23 | 2013-08-13 08:47:43 -0400 | [diff] [blame] | 80 | |
Dmitry Kasatkin | d16a858 | 2014-10-01 21:43:07 +0300 | [diff] [blame] | 81 | int __init integrity_init_keyring(const unsigned int id) |
Mimi Zohar | 7d2ce23 | 2013-08-13 08:47:43 -0400 | [diff] [blame] | 82 | { |
| 83 | const struct cred *cred = current_cred(); |
Mat Martineau | 2b6aa41 | 2016-08-31 16:05:43 -0700 | [diff] [blame] | 84 | struct key_restriction *restriction; |
Mimi Zohar | 7d2ce23 | 2013-08-13 08:47:43 -0400 | [diff] [blame] | 85 | int err = 0; |
| 86 | |
Dmitry Kasatkin | f4dc377 | 2015-10-22 21:26:10 +0300 | [diff] [blame] | 87 | if (!init_keyring) |
| 88 | return 0; |
| 89 | |
Mat Martineau | 2b6aa41 | 2016-08-31 16:05:43 -0700 | [diff] [blame] | 90 | restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL); |
| 91 | if (!restriction) |
| 92 | return -ENOMEM; |
| 93 | |
| 94 | restriction->check = restrict_link_to_ima; |
| 95 | |
Mimi Zohar | 7d2ce23 | 2013-08-13 08:47:43 -0400 | [diff] [blame] | 96 | keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0), |
| 97 | KGIDT_INIT(0), cred, |
| 98 | ((KEY_POS_ALL & ~KEY_POS_SETATTR) | |
| 99 | KEY_USR_VIEW | KEY_USR_READ | |
| 100 | KEY_USR_WRITE | KEY_USR_SEARCH), |
David Howells | 5ac7eac | 2016-04-06 16:14:24 +0100 | [diff] [blame] | 101 | KEY_ALLOC_NOT_IN_QUOTA, |
Mat Martineau | 2b6aa41 | 2016-08-31 16:05:43 -0700 | [diff] [blame] | 102 | restriction, NULL); |
David Howells | 5ac7eac | 2016-04-06 16:14:24 +0100 | [diff] [blame] | 103 | if (IS_ERR(keyring[id])) { |
Mimi Zohar | 7d2ce23 | 2013-08-13 08:47:43 -0400 | [diff] [blame] | 104 | err = PTR_ERR(keyring[id]); |
| 105 | pr_info("Can't allocate %s keyring (%d)\n", |
| 106 | keyring_name[id], err); |
| 107 | keyring[id] = NULL; |
| 108 | } |
| 109 | return err; |
| 110 | } |
Dmitry Kasatkin | 65d543b | 2014-11-05 17:01:13 +0200 | [diff] [blame] | 111 | |
Dmitry Kasatkin | 9d03a72 | 2014-11-26 16:55:00 +0200 | [diff] [blame] | 112 | int __init integrity_load_x509(const unsigned int id, const char *path) |
Dmitry Kasatkin | 65d543b | 2014-11-05 17:01:13 +0200 | [diff] [blame] | 113 | { |
| 114 | key_ref_t key; |
| 115 | char *data; |
| 116 | int rc; |
| 117 | |
| 118 | if (!keyring[id]) |
| 119 | return -EINVAL; |
| 120 | |
| 121 | rc = integrity_read_file(path, &data); |
| 122 | if (rc < 0) |
| 123 | return rc; |
| 124 | |
| 125 | key = key_create_or_update(make_key_ref(keyring[id], 1), |
| 126 | "asymmetric", |
| 127 | NULL, |
| 128 | data, |
| 129 | rc, |
| 130 | ((KEY_POS_ALL & ~KEY_POS_SETATTR) | |
| 131 | KEY_USR_VIEW | KEY_USR_READ), |
Dmitry Kasatkin | 72e1eed | 2015-09-10 22:06:15 +0300 | [diff] [blame] | 132 | KEY_ALLOC_NOT_IN_QUOTA); |
Dmitry Kasatkin | 65d543b | 2014-11-05 17:01:13 +0200 | [diff] [blame] | 133 | if (IS_ERR(key)) { |
| 134 | rc = PTR_ERR(key); |
| 135 | pr_err("Problem loading X.509 certificate (%d): %s\n", |
| 136 | rc, path); |
| 137 | } else { |
| 138 | pr_notice("Loaded X.509 cert '%s': %s\n", |
| 139 | key_ref_to_ptr(key)->description, path); |
| 140 | key_ref_put(key); |
| 141 | } |
| 142 | kfree(data); |
| 143 | return 0; |
| 144 | } |