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KEYS: Separate the kernel signature checking keyring from module signing
Separate the kernel signature checking keyring from module signing so that it can be used by code other than the module-signing code. Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
parent
0fbd39cf7f
commit
b56e5a17b6
23
include/keys/system_keyring.h
Normal file
23
include/keys/system_keyring.h
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@ -0,0 +1,23 @@
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/* System keyring containing trusted public keys.
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*
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* Copyright (C) 2013 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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#ifndef _KEYS_SYSTEM_KEYRING_H
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#define _KEYS_SYSTEM_KEYRING_H
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#ifdef CONFIG_SYSTEM_TRUSTED_KEYRING
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#include <linux/key.h>
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extern struct key *system_trusted_keyring;
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#endif
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#endif /* _KEYS_SYSTEM_KEYRING_H */
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13
init/Kconfig
13
init/Kconfig
@ -1668,6 +1668,18 @@ config BASE_SMALL
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default 0 if BASE_FULL
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default 1 if !BASE_FULL
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config SYSTEM_TRUSTED_KEYRING
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bool "Provide system-wide ring of trusted keys"
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depends on KEYS
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help
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Provide a system keyring to which trusted keys can be added. Keys in
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the keyring are considered to be trusted. Keys may be added at will
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by the kernel from compiled-in data and from hardware key stores, but
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userspace may only add extra keys if those keys can be verified by
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keys already in the keyring.
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Keys in this keyring are used by module signature checking.
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menuconfig MODULES
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bool "Enable loadable module support"
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option modules
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@ -1741,6 +1753,7 @@ config MODULE_SRCVERSION_ALL
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config MODULE_SIG
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bool "Module signature verification"
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depends on MODULES
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select SYSTEM_TRUSTED_KEYRING
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select KEYS
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select CRYPTO
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select ASYMMETRIC_KEY_TYPE
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@ -54,8 +54,9 @@ obj-$(CONFIG_SMP) += spinlock.o
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obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o
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obj-$(CONFIG_PROVE_LOCKING) += spinlock.o
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obj-$(CONFIG_UID16) += uid16.o
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obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o
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obj-$(CONFIG_MODULES) += module.o
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obj-$(CONFIG_MODULE_SIG) += module_signing.o modsign_pubkey.o modsign_certificate.o
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obj-$(CONFIG_MODULE_SIG) += module_signing.o
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obj-$(CONFIG_KALLSYMS) += kallsyms.o
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obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
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obj-$(CONFIG_KEXEC) += kexec.o
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@ -141,11 +142,11 @@ targets += timeconst.h
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$(obj)/timeconst.h: $(obj)/hz.bc $(src)/timeconst.bc FORCE
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$(call if_changed,bc)
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ifeq ($(CONFIG_MODULE_SIG),y)
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###############################################################################
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#
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# Roll all the X.509 certificates that we can find together and pull them into
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# the kernel.
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# the kernel so that they get loaded into the system trusted keyring during
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# boot.
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#
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# We look in the source root and the build root for all files whose name ends
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# in ".x509". Unfortunately, this will generate duplicate filenames, so we
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@ -153,6 +154,7 @@ ifeq ($(CONFIG_MODULE_SIG),y)
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# duplicates.
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#
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###############################################################################
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ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y)
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X509_CERTIFICATES-y := $(wildcard *.x509) $(wildcard $(srctree)/*.x509)
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X509_CERTIFICATES-$(CONFIG_MODULE_SIG) += signing_key.x509
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X509_CERTIFICATES := $(sort $(foreach CERT,$(X509_CERTIFICATES-y), \
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@ -169,10 +171,11 @@ $(shell rm $(obj)/.x509.list)
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endif
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endif
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kernel/modsign_certificate.o: $(obj)/x509_certificate_list
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kernel/system_certificates.o: $(obj)/x509_certificate_list
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quiet_cmd_x509certs = CERTS $@
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cmd_x509certs = cat $(X509_CERTIFICATES) /dev/null >$@
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cmd_x509certs = cat $(X509_CERTIFICATES) /dev/null >$@ $(foreach X509,$(X509_CERTIFICATES),; echo " - Including cert $(X509)")
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targets += $(obj)/x509_certificate_list
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$(obj)/x509_certificate_list: $(X509_CERTIFICATES) $(obj)/.x509.list
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$(call if_changed,x509certs)
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@ -182,7 +185,9 @@ $(obj)/.x509.list:
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@echo $(X509_CERTIFICATES) >$@
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clean-files := x509_certificate_list .x509.list
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endif
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ifeq ($(CONFIG_MODULE_SIG),y)
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###############################################################################
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#
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# If module signing is requested, say by allyesconfig, but a key has not been
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@ -1,104 +0,0 @@
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/* 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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@ -9,6 +9,4 @@
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* 2 of the Licence, or (at your option) any later version.
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*/
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extern struct key *modsign_keyring;
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extern int mod_verify_sig(const void *mod, unsigned long *_modlen);
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@ -14,6 +14,7 @@
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#include <crypto/public_key.h>
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#include <crypto/hash.h>
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#include <keys/asymmetric-type.h>
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#include <keys/system_keyring.h>
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#include "module-internal.h"
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/*
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@ -157,7 +158,7 @@ static struct key *request_asymmetric_key(const char *signer, size_t signer_len,
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pr_debug("Look up: \"%s\"\n", id);
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key = keyring_search(make_key_ref(modsign_keyring, 1),
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key = keyring_search(make_key_ref(system_trusted_keyring, 1),
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&key_type_asymmetric, id);
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if (IS_ERR(key))
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pr_warn("Request for unknown module key '%s' err %ld\n",
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@ -1,11 +1,12 @@
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#include <linux/export.h>
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#include <linux/init.h>
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#define GLOBAL(name) \
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.globl VMLINUX_SYMBOL(name); \
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VMLINUX_SYMBOL(name):
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.section ".init.data","aw"
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__INITRODATA
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GLOBAL(modsign_certificate_list)
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GLOBAL(system_certificate_list)
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.incbin "kernel/x509_certificate_list"
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GLOBAL(modsign_certificate_list_end)
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GLOBAL(system_certificate_list_end)
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103
kernel/system_keyring.c
Normal file
103
kernel/system_keyring.c
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@ -0,0 +1,103 @@
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/* System trusted keyring for trusted public keys
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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/export.h>
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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 <keys/system_keyring.h>
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#include "module-internal.h"
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struct key *system_trusted_keyring;
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EXPORT_SYMBOL_GPL(system_trusted_keyring);
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extern __initconst const u8 system_certificate_list[];
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extern __initconst const u8 system_certificate_list_end[];
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/*
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* Load the compiled-in keys
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*/
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static __init int system_trusted_keyring_init(void)
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{
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pr_notice("Initialise system trusted keyring\n");
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system_trusted_keyring =
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keyring_alloc(".system_keyring",
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KUIDT_INIT(0), KGIDT_INIT(0), 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(system_trusted_keyring))
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panic("Can't allocate system trusted 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(system_trusted_keyring_init);
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/*
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* Load the compiled-in list of X.509 certificates.
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*/
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static __init int load_system_certificate_list(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 compiled-in X.509 certificates\n");
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end = system_certificate_list_end;
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p = system_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(system_trusted_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("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("Loaded X.509 cert '%s'\n",
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key_ref_to_ptr(key)->description);
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key_ref_put(key);
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}
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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("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_system_certificate_list);
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