projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 631cc66e DH |
1 | /* Public keys for module signature verification |
| 2 | * | |
| 3 | * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved. | |
| 4 | * Written by David Howells (dhowells@redhat.com) | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or | |
| 7 | * modify it under the terms of the GNU General Public Licence | |
| 8 | * as published by the Free Software Foundation; either version | |
| 9 | * 2 of the Licence, or (at your option) any later version. | |
| 10 | */ | |
| 11 | ||
| 12 | #include <linux/kernel.h> | |
| 13 | #include <linux/sched.h> | |
| 14 | #include <linux/cred.h> | |
| 15 | #include <linux/err.h> | |
| 16 | #include <keys/asymmetric-type.h> | |
| 17 | #include "module-internal.h" | |
| 18 | ||
| 19 | struct key *modsign_keyring; | |
| 20 | ||
| 21 | extern __initdata const u8 modsign_certificate_list[]; | |
| 22 | extern __initdata const u8 modsign_certificate_list_end[]; | |
| 631cc66e DH |
23 | |
| 24 | /* | |
| 25 | * We need to make sure ccache doesn't cache the .o file as it doesn't notice | |
| 26 | * if modsign.pub changes. | |
| 27 | */ | |
| 28 | static __initdata const char annoy_ccache[] = __TIME__ "foo"; | |
| 29 | ||
| 30 | /* | |
| 31 | * Load the compiled-in keys | |
| 32 | */ | |
| 33 | static __init int module_verify_init(void) | |
| 34 | { | |
| 35 | pr_notice("Initialise module verification\n"); | |
| 36 | ||
| 37 | modsign_keyring = key_alloc(&key_type_keyring, ".module_sign", | |
| 38 | KUIDT_INIT(0), KGIDT_INIT(0), | |
| 39 | current_cred(), | |
| 40 | (KEY_POS_ALL & ~KEY_POS_SETATTR) | | |
| 41 | KEY_USR_VIEW | KEY_USR_READ, | |
| 42 | KEY_ALLOC_NOT_IN_QUOTA); | |
| 43 | if (IS_ERR(modsign_keyring)) | |
| 44 | panic("Can't allocate module signing keyring\n"); | |
| 45 | ||
| 46 | if (key_instantiate_and_link(modsign_keyring, NULL, 0, NULL, NULL) < 0) | |
| 47 | panic("Can't instantiate module signing keyring\n"); | |
| 48 | ||
| 49 | return 0; | |
| 50 | } | |
| 51 | ||
| 52 | /* | |
| 53 | * Must be initialised before we try and load the keys into the keyring. | |
| 54 | */ | |
| 55 | device_initcall(module_verify_init); | |
| 56 | ||
| 57 | /* | |
| 58 | * Load the compiled-in keys | |
| 59 | */ | |
| 60 | static __init int load_module_signing_keys(void) | |
| 61 | { | |
| 62 | key_ref_t key; | |
| 63 | const u8 *p, *end; | |
| 64 | size_t plen; | |
| 65 | ||
| 66 | pr_notice("Loading module verification certificates\n"); | |
| 67 | ||
| 68 | end = modsign_certificate_list_end; | |
| 69 | p = modsign_certificate_list; | |
| 70 | while (p < end) { | |
| 71 | /* Each cert begins with an ASN.1 SEQUENCE tag and must be more | |
| 72 | * than 256 bytes in size. | |
| 73 | */ | |
| 74 | if (end - p < 4) | |
| 75 | goto dodgy_cert; | |
| 76 | if (p[0] != 0x30 && | |
| 77 | p[1] != 0x82) | |
| 78 | goto dodgy_cert; | |
| 79 | plen = (p[2] << 8) | p[3]; | |
| 80 | plen += 4; | |
| 81 | if (plen > end - p) | |
| 82 | goto dodgy_cert; | |
| 83 | ||
| 84 | key = key_create_or_update(make_key_ref(modsign_keyring, 1), | |
| 85 | "asymmetric", | |
| 86 | NULL, | |
| 87 | p, | |
| 88 | plen, | |
| 89 | (KEY_POS_ALL & ~KEY_POS_SETATTR) | | |
| 90 | KEY_USR_VIEW, | |
| 91 | KEY_ALLOC_NOT_IN_QUOTA); | |
| 92 | if (IS_ERR(key)) | |
| 93 | pr_err("MODSIGN: Problem loading in-kernel X.509 certificate (%ld)\n", | |
| 94 | PTR_ERR(key)); | |
| 95 | else | |
| 96 | pr_notice("MODSIGN: Loaded cert '%s'\n", | |
| 97 | key_ref_to_ptr(key)->description); | |
| 98 | p += plen; | |
| 99 | } | |
| 100 | ||
| 101 | return 0; | |
| 102 | ||
| 103 | dodgy_cert: | |
| 104 | pr_err("MODSIGN: Problem parsing in-kernel X.509 certificate list\n"); | |
| 105 | return 0; | |
| 106 | } | |
| 107 | late_initcall(load_module_signing_keys); |