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-rw-r--r--security/integrity/Kconfig11
-rw-r--r--security/integrity/Makefile5
-rw-r--r--security/integrity/digsig.c111
-rw-r--r--security/integrity/ima/Kconfig10
-rw-r--r--security/integrity/ima/ima_appraise.c14
-rw-r--r--security/integrity/ima/ima_main.c21
-rw-r--r--security/integrity/ima/ima_policy.c171
-rw-r--r--security/integrity/integrity.h22
-rw-r--r--security/integrity/platform_certs/efi_parser.c108
-rw-r--r--security/integrity/platform_certs/load_uefi.c194
-rw-r--r--security/integrity/platform_certs/platform_keyring.c58
11 files changed, 633 insertions, 92 deletions
diff --git a/security/integrity/Kconfig b/security/integrity/Kconfig
index 877af1f2d904..2ea4ec9991d5 100644
--- a/security/integrity/Kconfig
+++ b/security/integrity/Kconfig
@@ -51,6 +51,17 @@ config INTEGRITY_TRUSTED_KEYRING
.evm keyrings be signed by a key on the system trusted
keyring.
+config INTEGRITY_PLATFORM_KEYRING
+ bool "Provide keyring for platform/firmware trusted keys"
+ depends on INTEGRITY_ASYMMETRIC_KEYS
+ depends on SYSTEM_BLACKLIST_KEYRING
+ depends on EFI
+ help
+ Provide a separate, distinct keyring for platform trusted keys, which
+ the kernel automatically populates during initialization from values
+ provided by the platform for verifying the kexec'ed kerned image
+ and, possibly, the initramfs signature.
+
config INTEGRITY_AUDIT
bool "Enables integrity auditing support "
depends on AUDIT
diff --git a/security/integrity/Makefile b/security/integrity/Makefile
index 04d6e462b079..86df9aba8c0f 100644
--- a/security/integrity/Makefile
+++ b/security/integrity/Makefile
@@ -9,6 +9,11 @@ integrity-y := iint.o
integrity-$(CONFIG_INTEGRITY_AUDIT) += integrity_audit.o
integrity-$(CONFIG_INTEGRITY_SIGNATURE) += digsig.o
integrity-$(CONFIG_INTEGRITY_ASYMMETRIC_KEYS) += digsig_asymmetric.o
+integrity-$(CONFIG_INTEGRITY_PLATFORM_KEYRING) += platform_certs/platform_keyring.o \
+ platform_certs/efi_parser.o \
+ platform_certs/load_uefi.o
+obj-$(CONFIG_LOAD_UEFI_KEYS) += platform_certs/load_uefi.o
+$(obj)/load_uefi.o: KBUILD_CFLAGS += -fshort-wchar
subdir-$(CONFIG_IMA) += ima
obj-$(CONFIG_IMA) += ima/
diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c
index 5eacba858e4b..f45d6edecf99 100644
--- a/security/integrity/digsig.c
+++ b/security/integrity/digsig.c
@@ -34,7 +34,7 @@ static const char * const keyring_name[INTEGRITY_KEYRING_MAX] = {
".evm",
".ima",
#endif
- "_module",
+ ".platform",
};
#ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
@@ -73,12 +73,38 @@ int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
return -EOPNOTSUPP;
}
-int __init integrity_init_keyring(const unsigned int id)
+static int __integrity_init_keyring(const unsigned int id, key_perm_t perm,
+ struct key_restriction *restriction)
{
const struct cred *cred = current_cred();
- struct key_restriction *restriction;
int err = 0;
+ keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0),
+ KGIDT_INIT(0), cred, perm,
+ KEY_ALLOC_NOT_IN_QUOTA, restriction, NULL);
+ if (IS_ERR(keyring[id])) {
+ err = PTR_ERR(keyring[id]);
+ pr_info("Can't allocate %s keyring (%d)\n",
+ keyring_name[id], err);
+ keyring[id] = NULL;
+ }
+
+ return err;
+}
+
+int __init integrity_init_keyring(const unsigned int id)
+{
+ struct key_restriction *restriction;
+ key_perm_t perm;
+
+ perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW
+ | KEY_USR_READ | KEY_USR_SEARCH;
+
+ if (id == INTEGRITY_KEYRING_PLATFORM) {
+ restriction = NULL;
+ goto out;
+ }
+
if (!IS_ENABLED(CONFIG_INTEGRITY_TRUSTED_KEYRING))
return 0;
@@ -87,32 +113,43 @@ int __init integrity_init_keyring(const unsigned int id)
return -ENOMEM;
restriction->check = restrict_link_to_ima;
+ perm |= KEY_USR_WRITE;
- keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0),
- KGIDT_INIT(0), cred,
- ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
- KEY_USR_VIEW | KEY_USR_READ |
- KEY_USR_WRITE | KEY_USR_SEARCH),
- KEY_ALLOC_NOT_IN_QUOTA,
- restriction, NULL);
- if (IS_ERR(keyring[id])) {
- err = PTR_ERR(keyring[id]);
- pr_info("Can't allocate %s keyring (%d)\n",
- keyring_name[id], err);
- keyring[id] = NULL;
+out:
+ return __integrity_init_keyring(id, perm, restriction);
+}
+
+int __init integrity_add_key(const unsigned int id, const void *data,
+ off_t size, key_perm_t perm)
+{
+ key_ref_t key;
+ int rc = 0;
+
+ if (!keyring[id])
+ return -EINVAL;
+
+ key = key_create_or_update(make_key_ref(keyring[id], 1), "asymmetric",
+ NULL, data, size, perm,
+ KEY_ALLOC_NOT_IN_QUOTA);
+ if (IS_ERR(key)) {
+ rc = PTR_ERR(key);
+ pr_err("Problem loading X.509 certificate %d\n", rc);
+ } else {
+ pr_notice("Loaded X.509 cert '%s'\n",
+ key_ref_to_ptr(key)->description);
+ key_ref_put(key);
}
- return err;
+
+ return rc;
+
}
int __init integrity_load_x509(const unsigned int id, const char *path)
{
- key_ref_t key;
void *data;
loff_t size;
int rc;
-
- if (!keyring[id])
- return -EINVAL;
+ key_perm_t perm;
rc = kernel_read_file_from_path(path, &data, &size, 0,
READING_X509_CERTIFICATE);
@@ -121,23 +158,21 @@ int __init integrity_load_x509(const unsigned int id, const char *path)
return rc;
}
- key = key_create_or_update(make_key_ref(keyring[id], 1),
- "asymmetric",
- NULL,
- data,
- size,
- ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
- KEY_USR_VIEW | KEY_USR_READ),
- KEY_ALLOC_NOT_IN_QUOTA);
- if (IS_ERR(key)) {
- rc = PTR_ERR(key);
- pr_err("Problem loading X.509 certificate (%d): %s\n",
- rc, path);
- } else {
- pr_notice("Loaded X.509 cert '%s': %s\n",
- key_ref_to_ptr(key)->description, path);
- key_ref_put(key);
- }
+ perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | KEY_USR_READ;
+
+ pr_info("Loading X.509 certificate: %s\n", path);
+ rc = integrity_add_key(id, (const void *)data, size, perm);
+
vfree(data);
- return 0;
+ return rc;
+}
+
+int __init integrity_load_cert(const unsigned int id, const char *source,
+ const void *data, size_t len, key_perm_t perm)
+{
+ if (!data)
+ return -EINVAL;
+
+ pr_info("Loading X.509 certificate: %s\n", source);
+ return integrity_add_key(id, data, len, perm);
}
diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig
index 13b446328dda..a18f8c6d13b5 100644
--- a/security/integrity/ima/Kconfig
+++ b/security/integrity/ima/Kconfig
@@ -157,6 +157,14 @@ config IMA_APPRAISE
<http://linux-ima.sourceforge.net>
If unsure, say N.
+config IMA_ARCH_POLICY
+ bool "Enable loading an IMA architecture specific policy"
+ depends on KEXEC_VERIFY_SIG || IMA_APPRAISE && INTEGRITY_ASYMMETRIC_KEYS
+ default n
+ help
+ This option enables loading an IMA architecture specific policy
+ based on run time secure boot flags.
+
config IMA_APPRAISE_BUILD_POLICY
bool "IMA build time configured policy rules"
depends on IMA_APPRAISE && INTEGRITY_ASYMMETRIC_KEYS
@@ -217,7 +225,7 @@ config IMA_APPRAISE_REQUIRE_POLICY_SIGS
config IMA_APPRAISE_BOOTPARAM
bool "ima_appraise boot parameter"
- depends on IMA_APPRAISE
+ depends on IMA_APPRAISE && !IMA_ARCH_POLICY
default y
help
This option enables the different "ima_appraise=" modes
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index 2e11e750a067..a2baa85ea2f5 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -289,12 +289,22 @@ int ima_appraise_measurement(enum ima_hooks func,
case EVM_IMA_XATTR_DIGSIG:
set_bit(IMA_DIGSIG, &iint->atomic_flags);
rc = integrity_digsig_verify(INTEGRITY_KEYRING_IMA,
- (const char *)xattr_value, rc,
+ (const char *)xattr_value,
+ xattr_len,
iint->ima_hash->digest,
iint->ima_hash->length);
if (rc == -EOPNOTSUPP) {
status = INTEGRITY_UNKNOWN;
- } else if (rc) {
+ break;
+ }
+ if (IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING) && rc &&
+ func == KEXEC_KERNEL_CHECK)
+ rc = integrity_digsig_verify(INTEGRITY_KEYRING_PLATFORM,
+ (const char *)xattr_value,
+ xattr_len,
+ iint->ima_hash->digest,
+ iint->ima_hash->length);
+ if (rc) {
cause = "invalid-signature";
status = INTEGRITY_FAIL;
} else {
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 616a88f95b92..4ffac4f5c647 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -105,7 +105,7 @@ static void ima_rdwr_violation_check(struct file *file,
} else {
if (must_measure)
set_bit(IMA_MUST_MEASURE, &iint->atomic_flags);
- if ((atomic_read(&inode->i_writecount) > 0) && must_measure)
+ if (inode_is_open_for_write(inode) && must_measure)
send_writers = true;
}
@@ -507,20 +507,26 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
*/
int ima_load_data(enum kernel_load_data_id id)
{
- bool sig_enforce;
+ bool ima_enforce, sig_enforce;
- if ((ima_appraise & IMA_APPRAISE_ENFORCE) != IMA_APPRAISE_ENFORCE)
- return 0;
+ ima_enforce =
+ (ima_appraise & IMA_APPRAISE_ENFORCE) == IMA_APPRAISE_ENFORCE;
switch (id) {
case LOADING_KEXEC_IMAGE:
- if (ima_appraise & IMA_APPRAISE_KEXEC) {
+ if (IS_ENABLED(CONFIG_KEXEC_VERIFY_SIG)
+ && arch_ima_get_secureboot()) {
+ pr_err("impossible to appraise a kernel image without a file descriptor; try using kexec_file_load syscall.\n");
+ return -EACCES;
+ }
+
+ if (ima_enforce && (ima_appraise & IMA_APPRAISE_KEXEC)) {
pr_err("impossible to appraise a kernel image without a file descriptor; try using kexec_file_load syscall.\n");
return -EACCES; /* INTEGRITY_UNKNOWN */
}
break;
case LOADING_FIRMWARE:
- if (ima_appraise & IMA_APPRAISE_FIRMWARE) {
+ if (ima_enforce && (ima_appraise & IMA_APPRAISE_FIRMWARE)) {
pr_err("Prevent firmware sysfs fallback loading.\n");
return -EACCES; /* INTEGRITY_UNKNOWN */
}
@@ -528,7 +534,8 @@ int ima_load_data(enum kernel_load_data_id id)
case LOADING_MODULE:
sig_enforce = is_module_sig_enforced();
- if (!sig_enforce && (ima_appraise & IMA_APPRAISE_MODULES)) {
+ if (ima_enforce && (!sig_enforce
+ && (ima_appraise & IMA_APPRAISE_MODULES))) {
pr_err("impossible to appraise a module without a file descriptor. sig_enforce kernel parameter might help\n");
return -EACCES; /* INTEGRITY_UNKNOWN */
}
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index fcf5b2729063..8bc8a1c8cb3f 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -20,6 +20,7 @@
#include <linux/rculist.h>
#include <linux/genhd.h>
#include <linux/seq_file.h>
+#include <linux/ima.h>
#include "ima.h"
@@ -58,6 +59,8 @@ enum lsm_rule_types { LSM_OBJ_USER, LSM_OBJ_ROLE, LSM_OBJ_TYPE,
enum policy_types { ORIGINAL_TCB = 1, DEFAULT_TCB };
+enum policy_rule_list { IMA_DEFAULT_POLICY = 1, IMA_CUSTOM_POLICY };
+
struct ima_rule_entry {
struct list_head list;
int action;
@@ -104,7 +107,8 @@ static struct ima_rule_entry dont_measure_rules[] __ro_after_init = {
.flags = IMA_FSMAGIC},
{.action = DONT_MEASURE, .fsmagic = CGROUP2_SUPER_MAGIC,
.flags = IMA_FSMAGIC},
- {.action = DONT_MEASURE, .fsmagic = NSFS_MAGIC, .flags = IMA_FSMAGIC}
+ {.action = DONT_MEASURE, .fsmagic = NSFS_MAGIC, .flags = IMA_FSMAGIC},
+ {.action = DONT_MEASURE, .fsmagic = EFIVARFS_MAGIC, .flags = IMA_FSMAGIC}
};
static struct ima_rule_entry original_measurement_rules[] __ro_after_init = {
@@ -147,6 +151,7 @@ static struct ima_rule_entry default_appraise_rules[] __ro_after_init = {
{.action = DONT_APPRAISE, .fsmagic = SELINUX_MAGIC, .flags = IMA_FSMAGIC},
{.action = DONT_APPRAISE, .fsmagic = SMACK_MAGIC, .flags = IMA_FSMAGIC},
{.action = DONT_APPRAISE, .fsmagic = NSFS_MAGIC, .flags = IMA_FSMAGIC},
+ {.action = DONT_APPRAISE, .fsmagic = EFIVARFS_MAGIC, .flags = IMA_FSMAGIC},
{.action = DONT_APPRAISE, .fsmagic = CGROUP_SUPER_MAGIC, .flags = IMA_FSMAGIC},
{.action = DONT_APPRAISE, .fsmagic = CGROUP2_SUPER_MAGIC, .flags = IMA_FSMAGIC},
#ifdef CONFIG_IMA_WRITE_POLICY
@@ -193,6 +198,9 @@ static struct ima_rule_entry secure_boot_rules[] __ro_after_init = {
.flags = IMA_FUNC | IMA_DIGSIG_REQUIRED},
};
+/* An array of architecture specific rules */
+struct ima_rule_entry *arch_policy_entry __ro_after_init;
+
static LIST_HEAD(ima_default_rules);
static LIST_HEAD(ima_policy_rules);
static LIST_HEAD(ima_temp_rules);
@@ -473,6 +481,75 @@ static int ima_appraise_flag(enum ima_hooks func)
return 0;
}
+static void add_rules(struct ima_rule_entry *entries, int count,
+ enum policy_rule_list policy_rule)
+{
+ int i = 0;
+
+ for (i = 0; i < count; i++) {
+ struct ima_rule_entry *entry;
+
+ if (policy_rule & IMA_DEFAULT_POLICY)
+ list_add_tail(&entries[i].list, &ima_default_rules);
+
+ if (policy_rule & IMA_CUSTOM_POLICY) {
+ entry = kmemdup(&entries[i], sizeof(*entry),
+ GFP_KERNEL);
+ if (!entry)
+ continue;
+
+ list_add_tail(&entry->list, &ima_policy_rules);
+ }
+ if (entries[i].action == APPRAISE)
+ temp_ima_appraise |= ima_appraise_flag(entries[i].func);
+ if (entries[i].func == POLICY_CHECK)
+ temp_ima_appraise |= IMA_APPRAISE_POLICY;
+ }
+}
+
+static int ima_parse_rule(char *rule, struct ima_rule_entry *entry);
+
+static int __init ima_init_arch_policy(void)
+{
+ const char * const *arch_rules;
+ const char * const *rules;
+ int arch_entries = 0;
+ int i = 0;
+
+ arch_rules = arch_get_ima_policy();
+ if (!arch_rules)
+ return arch_entries;
+
+ /* Get number of rules */
+ for (rules = arch_rules; *rules != NULL; rules++)
+ arch_entries++;
+
+ arch_policy_entry = kcalloc(arch_entries + 1,
+ sizeof(*arch_policy_entry), GFP_KERNEL);
+ if (!arch_policy_entry)
+ return 0;
+
+ /* Convert each policy string rules to struct ima_rule_entry format */
+ for (rules = arch_rules, i = 0; *rules != NULL; rules++) {
+ char rule[255];
+ int result;
+
+ result = strlcpy(rule, *rules, sizeof(rule));
+
+ INIT_LIST_HEAD(&arch_policy_entry[i].list);
+ result = ima_parse_rule(rule, &arch_policy_entry[i]);
+ if (result) {
+ pr_warn("Skipping unknown architecture policy rule: %s\n",
+ rule);
+ memset(&arch_policy_entry[i], 0,
+ sizeof(*arch_policy_entry));
+ continue;
+ }
+ i++;
+ }
+ return i;
+}
+
/**
* ima_init_policy - initialize the default measure rules.
*
@@ -481,68 +558,68 @@ static int ima_appraise_flag(enum ima_hooks func)
*/
void __init ima_init_policy(void)
{
- int i, measure_entries, appraise_entries, secure_boot_entries;
+ int build_appraise_entries, arch_entries;
- /* if !ima_policy set entries = 0 so we load NO default rules */
- measure_entries = ima_policy ? ARRAY_SIZE(dont_measure_rules) : 0;
- appraise_entries = ima_use_appraise_tcb ?
- ARRAY_SIZE(default_appraise_rules) : 0;
- secure_boot_entries = ima_use_secure_boot ?
- ARRAY_SIZE(secure_boot_rules) : 0;
-
- for (i = 0; i < measure_entries; i++)
- list_add_tail(&dont_measure_rules[i].list, &ima_default_rules);
+ /* if !ima_policy, we load NO default rules */
+ if (ima_policy)
+ add_rules(dont_measure_rules, ARRAY_SIZE(dont_measure_rules),
+ IMA_DEFAULT_POLICY);
switch (ima_policy) {
case ORIGINAL_TCB:
- for (i = 0; i < ARRAY_SIZE(original_measurement_rules); i++)
- list_add_tail(&original_measurement_rules[i].list,
- &ima_default_rules);
+ add_rules(original_measurement_rules,
+ ARRAY_SIZE(original_measurement_rules),
+ IMA_DEFAULT_POLICY);
break;
case DEFAULT_TCB:
- for (i = 0; i < ARRAY_SIZE(default_measurement_rules); i++)
- list_add_tail(&default_measurement_rules[i].list,
- &ima_default_rules);
+ add_rules(default_measurement_rules,
+ ARRAY_SIZE(default_measurement_rules),
+ IMA_DEFAULT_POLICY);
default:
break;
}
/*
+ * Based on runtime secure boot flags, insert arch specific measurement
+ * and appraise rules requiring file signatures for both the initial
+ * and custom policies, prior to other appraise rules.
+ * (Highest priority)
+ */
+ arch_entries = ima_init_arch_policy();
+ if (!arch_entries)
+ pr_info("No architecture policies found\n");
+ else
+ add_rules(arch_policy_entry, arch_entries,
+ IMA_DEFAULT_POLICY | IMA_CUSTOM_POLICY);
+
+ /*
* Insert the builtin "secure_boot" policy rules requiring file
- * signatures, prior to any other appraise rules.
+ * signatures, prior to other appraise rules.
*/
- for (i = 0; i < secure_boot_entries; i++) {
- list_add_tail(&secure_boot_rules[i].list, &ima_default_rules);
- temp_ima_appraise |=
- ima_appraise_flag(secure_boot_rules[i].func);
- }
+ if (ima_use_secure_boot)
+ add_rules(secure_boot_rules, ARRAY_SIZE(secure_boot_rules),
+ IMA_DEFAULT_POLICY);
/*
* Insert the build time appraise rules requiring file signatures
* for both the initial and custom policies, prior to other appraise
- * rules.
+ * rules. As the secure boot rules includes all of the build time
+ * rules, include either one or the other set of rules, but not both.
*/
- for (i = 0; i < ARRAY_SIZE(build_appraise_rules); i++) {
- struct ima_rule_entry *entry;
-
- if (!secure_boot_entries)
- list_add_tail(&build_appraise_rules[i].list,
- &ima_default_rules);
-
- entry = kmemdup(&build_appraise_rules[i], sizeof(*entry),
- GFP_KERNEL);
- if (entry)
- list_add_tail(&entry->list, &ima_policy_rules);
- build_ima_appraise |=
- ima_appraise_flag(build_appraise_rules[i].func);
+ build_appraise_entries = ARRAY_SIZE(build_appraise_rules);
+ if (build_appraise_entries) {
+ if (ima_use_secure_boot)
+ add_rules(build_appraise_rules, build_appraise_entries,
+ IMA_CUSTOM_POLICY);
+ else
+ add_rules(build_appraise_rules, build_appraise_entries,
+ IMA_DEFAULT_POLICY | IMA_CUSTOM_POLICY);
}
- for (i = 0; i < appraise_entries; i++) {
- list_add_tail(&default_appraise_rules[i].list,
- &ima_default_rules);
- if (default_appraise_rules[i].func == POLICY_CHECK)
- temp_ima_appraise |= IMA_APPRAISE_POLICY;
- }
+ if (ima_use_appraise_tcb)
+ add_rules(default_appraise_rules,
+ ARRAY_SIZE(default_appraise_rules),
+ IMA_DEFAULT_POLICY);
ima_rules = &ima_default_rules;
ima_update_policy_flag();
@@ -576,6 +653,14 @@ void ima_update_policy(void)
if (ima_rules != policy) {
ima_policy_flag = 0;
ima_rules = policy;
+
+ /*
+ * IMA architecture specific policy rules are specified
+ * as strings and converted to an array of ima_entry_rules
+ * on boot. After loading a custom policy, free the
+ * architecture specific rules stored as an array.
+ */
+ kfree(arch_policy_entry);
}
ima_update_policy_flag();
}
diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
index e60473b13a8d..7de59f44cba3 100644
--- a/security/integrity/integrity.h
+++ b/security/integrity/integrity.h
@@ -141,7 +141,7 @@ int integrity_kernel_read(struct file *file, loff_t offset,
#define INTEGRITY_KEYRING_EVM 0
#define INTEGRITY_KEYRING_IMA 1
-#define INTEGRITY_KEYRING_MODULE 2
+#define INTEGRITY_KEYRING_PLATFORM 2
#define INTEGRITY_KEYRING_MAX 3
extern struct dentry *integrity_dir;
@@ -153,6 +153,8 @@ int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
int __init integrity_init_keyring(const unsigned int id);
int __init integrity_load_x509(const unsigned int id, const char *path);
+int __init integrity_load_cert(const unsigned int id, const char *source,
+ const void *data, size_t len, key_perm_t perm);
#else
static inline int integrity_digsig_verify(const unsigned int id,
@@ -166,6 +168,14 @@ static inline int integrity_init_keyring(const unsigned int id)
{
return 0;
}
+
+static inline int __init integrity_load_cert(const unsigned int id,
+ const char *source,
+ const void *data, size_t len,
+ key_perm_t perm)
+{
+ return 0;
+}
#endif /* CONFIG_INTEGRITY_SIGNATURE */
#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
@@ -222,3 +232,13 @@ integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
}
#endif
+
+#ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING
+void __init add_to_platform_keyring(const char *source, const void *data,
+ size_t len);
+#else
+static inline void __init add_to_platform_keyring(const char *source,
+ const void *data, size_t len)
+{
+}
+#endif
diff --git a/security/integrity/platform_certs/efi_parser.c b/security/integrity/platform_certs/efi_parser.c
new file mode 100644
index 000000000000..18f01f36fe6a
--- /dev/null
+++ b/security/integrity/platform_certs/efi_parser.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* EFI signature/key/certificate list parser
+ *
+ * Copyright (C) 2012, 2016 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#define pr_fmt(fmt) "EFI: "fmt
+#include <linux/module.h>
+#include <linux/printk.h>
+#include <linux/err.h>
+#include <linux/efi.h>
+
+/**
+ * parse_efi_signature_list - Parse an EFI signature list for certificates
+ * @source: The source of the key
+ * @data: The data blob to parse
+ * @size: The size of the data blob
+ * @get_handler_for_guid: Get the handler func for the sig type (or NULL)
+ *
+ * Parse an EFI signature list looking for elements of interest. A list is
+ * made up of a series of sublists, where all the elements in a sublist are of
+ * the same type, but sublists can be of different types.
+ *
+ * For each sublist encountered, the @get_handler_for_guid function is called
+ * with the type specifier GUID and returns either a pointer to a function to
+ * handle elements of that type or NULL if the type is not of interest.
+ *
+ * If the sublist is of interest, each element is passed to the handler
+ * function in turn.
+ *
+ * Error EBADMSG is returned if the list doesn't parse correctly and 0 is
+ * returned if the list was parsed correctly. No error can be returned from
+ * the @get_handler_for_guid function or the element handler function it
+ * returns.
+ */
+int __init parse_efi_signature_list(
+ const char *source,
+ const void *data, size_t size,
+ efi_element_handler_t (*get_handler_for_guid)(const efi_guid_t *))
+{
+ efi_element_handler_t handler;
+ unsigned int offs = 0;
+
+ pr_devel("-->%s(,%zu)\n", __func__, size);
+
+ while (size > 0) {
+ const efi_signature_data_t *elem;
+ efi_signature_list_t list;
+ size_t lsize, esize, hsize, elsize;
+
+ if (size < sizeof(list))
+ return -EBADMSG;
+
+ memcpy(&list, data, sizeof(list));
+ pr_devel("LIST[%04x] guid=%pUl ls=%x hs=%x ss=%x\n",
+ offs,
+ list.signature_type.b, list.signature_list_size,
+ list.signature_header_size, list.signature_size);
+
+ lsize = list.signature_list_size;
+ hsize = list.signature_header_size;
+ esize = list.signature_size;
+ elsize = lsize - sizeof(list) - hsize;
+
+ if (lsize > size) {
+ pr_devel("<--%s() = -EBADMSG [overrun @%x]\n",
+ __func__, offs);
+ return -EBADMSG;
+ }
+
+ if (lsize < sizeof(list) ||
+ lsize - sizeof(list) < hsize ||
+ esize < sizeof(*elem) ||
+ elsize < esize ||
+ elsize % esize != 0) {
+ pr_devel("- bad size combo @%x\n", offs);
+ return -EBADMSG;
+ }
+
+ handler = get_handler_for_guid(&list.signature_type);
+ if (!handler) {
+ data += lsize;
+ size -= lsize;
+ offs += lsize;
+ continue;
+ }
+
+ data += sizeof(list) + hsize;
+ size -= sizeof(list) + hsize;
+ offs += sizeof(list) + hsize;
+
+ for (; elsize > 0; elsize -= esize) {
+ elem = data;
+
+ pr_devel("ELEM[%04x]\n", offs);
+ handler(source,
+ &elem->signature_data,
+ esize - sizeof(*elem));
+
+ data += esize;
+ size -= esize;
+ offs += esize;
+ }
+ }
+
+ return 0;
+}
diff --git a/security/integrity/platform_certs/load_uefi.c b/security/integrity/platform_certs/load_uefi.c
new file mode 100644
index 000000000000..81b19c52832b
--- /dev/null
+++ b/security/integrity/platform_certs/load_uefi.c
@@ -0,0 +1,194 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/cred.h>
+#include <linux/err.h>
+#include <linux/efi.h>
+#include <linux/slab.h>
+#include <keys/asymmetric-type.h>
+#include <keys/system_keyring.h>
+#include "../integrity.h"
+
+static efi_guid_t efi_cert_x509_guid __initdata = EFI_CERT_X509_GUID;
+static efi_guid_t efi_cert_x509_sha256_guid __initdata =
+ EFI_CERT_X509_SHA256_GUID;
+static efi_guid_t efi_cert_sha256_guid __initdata = EFI_CERT_SHA256_GUID;
+
+/*
+ * Look to see if a UEFI variable called MokIgnoreDB exists and return true if
+ * it does.
+ *
+ * This UEFI variable is set by the shim if a user tells the shim to not use
+ * the certs/hashes in the UEFI db variable for verification purposes. If it
+ * is set, we should ignore the db variable also and the true return indicates
+ * this.
+ */
+static __init bool uefi_check_ignore_db(void)
+{
+ efi_status_t status;
+ unsigned int db = 0;
+ unsigned long size = sizeof(db);
+ efi_guid_t guid = EFI_SHIM_LOCK_GUID;
+
+ status = efi.get_variable(L"MokIgnoreDB", &guid, NULL, &size, &db);
+ return status == EFI_SUCCESS;
+}
+
+/*
+ * Get a certificate list blob from the named EFI variable.
+ */
+static __init void *get_cert_list(efi_char16_t *name, efi_guid_t *guid,
+ unsigned long *size)
+{
+ efi_status_t status;
+ unsigned long lsize = 4;
+ unsigned long tmpdb[4];
+ void *db;
+
+ status = efi.get_variable(name, guid, NULL, &lsize, &tmpdb);
+ if (status != EFI_BUFFER_TOO_SMALL) {
+ pr_err("Couldn't get size: 0x%lx\n", status);
+ return NULL;
+ }
+
+ db = kmalloc(lsize, GFP_KERNEL);
+ if (!db)
+ return NULL;
+
+ status = efi.get_variable(name, guid, NULL, &lsize, db);
+ if (status != EFI_SUCCESS) {
+ kfree(db);
+ pr_err("Error reading db var: 0x%lx\n", status);
+ return NULL;
+ }
+
+ *size = lsize;
+ return db;
+}
+
+/*
+ * Blacklist a hash.
+ */
+static __init void uefi_blacklist_hash(const char *source, const void *data,
+ size_t len, const char *type,
+ size_t type_len)
+{
+ char *hash, *p;
+
+ hash = kmalloc(type_len + len * 2 + 1, GFP_KERNEL);
+ if (!hash)
+ return;
+ p = memcpy(hash, type, type_len);
+ p += type_len;
+ bin2hex(p, data, len);
+ p += len * 2;
+ *p = 0;
+
+ mark_hash_blacklisted(hash);
+ kfree(hash);
+}
+
+/*
+ * Blacklist an X509 TBS hash.
+ */
+static __init void uefi_blacklist_x509_tbs(const char *source,
+ const void *data, size_t len)
+{
+ uefi_blacklist_hash(source, data, len, "tbs:", 4);
+}
+
+/*
+ * Blacklist the hash of an executable.
+ */
+static __init void uefi_blacklist_binary(const char *source,
+ const void *data, size_t len)
+{
+ uefi_blacklist_hash(source, data, len, "bin:", 4);
+}
+
+/*
+ * Return the appropriate handler for particular signature list types found in
+ * the UEFI db and MokListRT tables.
+ */
+static __init efi_element_handler_t get_handler_for_db(const efi_guid_t *
+ sig_type)
+{
+ if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0)
+ return add_to_platform_keyring;
+ return 0;
+}
+
+/*
+ * Return the appropriate handler for particular signature list types found in
+ * the UEFI dbx and MokListXRT tables.
+ */
+static __init efi_element_handler_t get_handler_for_dbx(const efi_guid_t *
+ sig_type)
+{
+ if (efi_guidcmp(*sig_type, efi_cert_x509_sha256_guid) == 0)
+ return uefi_blacklist_x509_tbs;
+ if (efi_guidcmp(*sig_type, efi_cert_sha256_guid) == 0)
+ return uefi_blacklist_binary;
+ return 0;
+}
+
+/*
+ * Load the certs contained in the UEFI databases into the platform trusted
+ * keyring and the UEFI blacklisted X.509 cert SHA256 hashes into the blacklist
+ * keyring.
+ */
+static int __init load_uefi_certs(void)
+{
+ efi_guid_t secure_var = EFI_IMAGE_SECURITY_DATABASE_GUID;
+ efi_guid_t mok_var = EFI_SHIM_LOCK_GUID;
+ void *db = NULL, *dbx = NULL, *mok = NULL;
+ unsigned long dbsize = 0, dbxsize = 0, moksize = 0;
+ int rc = 0;
+
+ if (!efi.get_variable)
+ return false;
+
+ /* Get db, MokListRT, and dbx. They might not exist, so it isn't
+ * an error if we can't get them.
+ */
+ if (!uefi_check_ignore_db()) {
+ db = get_cert_list(L"db", &secure_var, &dbsize);
+ if (!db) {
+ pr_err("MODSIGN: Couldn't get UEFI db list\n");
+ } else {
+ rc = parse_efi_signature_list("UEFI:db",
+ db, dbsize, get_handler_for_db);
+ if (rc)
+ pr_err("Couldn't parse db signatures: %d\n",
+ rc);
+ kfree(db);
+ }
+ }
+
+ mok = get_cert_list(L"MokListRT", &mok_var, &moksize);
+ if (!mok) {
+ pr_info("Couldn't get UEFI MokListRT\n");
+ } else {
+ rc = parse_efi_signature_list("UEFI:MokListRT",
+ mok, moksize, get_handler_for_db);
+ if (rc)
+ pr_err("Couldn't parse MokListRT signatures: %d\n", rc);
+ kfree(mok);
+ }
+
+ dbx = get_cert_list(L"dbx", &secure_var, &dbxsize);
+ if (!dbx) {
+ pr_info("Couldn't get UEFI dbx list\n");
+ } else {
+ rc = parse_efi_signature_list("UEFI:dbx",
+ dbx, dbxsize,
+ get_handler_for_dbx);
+ if (rc)
+ pr_err("Couldn't parse dbx signatures: %d\n", rc);
+ kfree(dbx);
+ }
+
+ return rc;
+}
+late_initcall(load_uefi_certs);
diff --git a/security/integrity/platform_certs/platform_keyring.c b/security/integrity/platform_certs/platform_keyring.c
new file mode 100644
index 000000000000..bcafd7387729
--- /dev/null
+++ b/security/integrity/platform_certs/platform_keyring.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Platform keyring for firmware/platform keys
+ *
+ * Copyright IBM Corporation, 2018
+ * Author(s): Nayna Jain <nayna@linux.ibm.com>
+ */
+
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/cred.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include "../integrity.h"
+
+/**
+ * add_to_platform_keyring - Add to platform keyring without validation.
+ * @source: Source of key
+ * @data: The blob holding the key
+ * @len: The length of the data blob
+ *
+ * Add a key to the platform keyring without checking its trust chain. This
+ * is available only during kernel initialisation.
+ */
+void __init add_to_platform_keyring(const char *source, const void *data,
+ size_t len)
+{
+ key_perm_t perm;
+ int rc;
+
+ perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW;
+
+ rc = integrity_load_cert(INTEGRITY_KEYRING_PLATFORM, source, data, len,
+ perm);
+ if (rc)
+ pr_info("Error adding keys to platform keyring %s\n", source);
+}
+
+/*
+ * Create the trusted keyrings.
+ */
+static __init int platform_keyring_init(void)
+{
+ int rc;
+
+ rc = integrity_init_keyring(INTEGRITY_KEYRING_PLATFORM);
+ if (rc)
+ return rc;
+
+ pr_notice("Platform Keyring initialized\n");
+ return 0;
+}
+
+/*
+ * Must be initialised before we try and load the keys into the keyring.
+ */
+device_initcall(platform_keyring_init);