105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
/* Public keys for module signature verification
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*
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* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/cred.h>
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#include <linux/err.h>
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#include <keys/asymmetric-type.h>
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#include "module-internal.h"
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struct key *modsign_keyring;
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extern __initconst const u8 modsign_certificate_list[];
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extern __initconst const u8 modsign_certificate_list_end[];
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/*
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* We need to make sure ccache doesn't cache the .o file as it doesn't notice
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* if modsign.pub changes.
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*/
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static __initconst const char annoy_ccache[] = __TIME__ "foo";
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/*
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* Load the compiled-in keys
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*/
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static __init int module_verify_init(void)
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{
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pr_notice("Initialise module verification\n");
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modsign_keyring = keyring_alloc(".module_sign",
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KUIDT_INIT(0), KGIDT_INIT(0),
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current_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_ALLOC_NOT_IN_QUOTA, NULL);
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if (IS_ERR(modsign_keyring))
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panic("Can't allocate module signing keyring\n");
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return 0;
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}
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/*
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* Must be initialised before we try and load the keys into the keyring.
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*/
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device_initcall(module_verify_init);
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/*
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* Load the compiled-in keys
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*/
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static __init int load_module_signing_keys(void)
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{
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key_ref_t key;
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const u8 *p, *end;
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size_t plen;
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pr_notice("Loading module verification certificates\n");
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end = modsign_certificate_list_end;
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p = modsign_certificate_list;
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while (p < end) {
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/* Each cert begins with an ASN.1 SEQUENCE tag and must be more
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* than 256 bytes in size.
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*/
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if (end - p < 4)
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goto dodgy_cert;
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if (p[0] != 0x30 &&
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p[1] != 0x82)
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goto dodgy_cert;
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plen = (p[2] << 8) | p[3];
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plen += 4;
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if (plen > end - p)
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goto dodgy_cert;
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key = key_create_or_update(make_key_ref(modsign_keyring, 1),
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"asymmetric",
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NULL,
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p,
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plen,
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(KEY_POS_ALL & ~KEY_POS_SETATTR) |
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KEY_USR_VIEW,
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KEY_ALLOC_NOT_IN_QUOTA);
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if (IS_ERR(key))
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pr_err("MODSIGN: Problem loading in-kernel X.509 certificate (%ld)\n",
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PTR_ERR(key));
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else
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pr_notice("MODSIGN: Loaded cert '%s'\n",
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key_ref_to_ptr(key)->description);
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p += plen;
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}
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return 0;
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dodgy_cert:
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pr_err("MODSIGN: Problem parsing in-kernel X.509 certificate list\n");
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return 0;
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}
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late_initcall(load_module_signing_keys);
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