modsign_pubkey.c

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    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[];
   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 = keyring_alloc(".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, NULL);
   43         if (IS_ERR(modsign_keyring))
   44                 panic("Can't allocate module signing keyring\n");
   45 
   46         return 0;
   47 }
   48 
   49 /*
   50  * Must be initialised before we try and load the keys into the keyring.
   51  */
   52 device_initcall(module_verify_init);
   53 
   54 /*
   55  * Load the compiled-in keys
   56  */
   57 static __init int load_module_signing_keys(void)
   58 {
   59         key_ref_t key;
   60         const u8 *p, *end;
   61         size_t plen;
   62 
   63         pr_notice("Loading module verification certificates\n");
   64 
   65         end = modsign_certificate_list_end;
   66         p = modsign_certificate_list;
   67         while (p < end) {
   68                 /* Each cert begins with an ASN.1 SEQUENCE tag and must be more
   69                  * than 256 bytes in size.
   70                  */
   71                 if (end - p < 4)
   72                         goto dodgy_cert;
   73                 if (p[0] != 0x30 &&
   74                     p[1] != 0x82)
   75                         goto dodgy_cert;
   76                 plen = (p[2] << 8) | p[3];
   77                 plen += 4;
   78                 if (plen > end - p)
   79                         goto dodgy_cert;
   80 
   81                 key = key_create_or_update(make_key_ref(modsign_keyring, 1),
   82                                            "asymmetric",
   83                                            NULL,
   84                                            p,
   85                                            plen,
   86                                            (KEY_POS_ALL & ~KEY_POS_SETATTR) |
   87                                            KEY_USR_VIEW,
   88                                            KEY_ALLOC_NOT_IN_QUOTA);
   89                 if (IS_ERR(key))
   90                         pr_err("MODSIGN: Problem loading in-kernel X.509 certificate (%ld)\n",
   91                                PTR_ERR(key));
   92                 else
   93                         pr_notice("MODSIGN: Loaded cert '%s'\n",
   94                                   key_ref_to_ptr(key)->description);
   95                 p += plen;
   96         }
   97 
   98         return 0;
   99 
  100 dodgy_cert:
  101         pr_err("MODSIGN: Problem parsing in-kernel X.509 certificate list\n");
  102         return 0;
  103 }
  104 late_initcall(load_module_signing_keys);

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FreeBSD/Linux Kernel Cross Reference sys/kernel/modsign_pubkey.c

FreeBSD/Linux Kernel Cross Reference
sys/kernel/modsign_pubkey.c