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integrity: Load certs to the platform keyring 

The patch refactors integrity_load_x509(), making it a wrapper for a new
function named integrity_add_key(). This patch also defines a new
function named integrity_load_cert() for loading the platform keys.

Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
Reviewed-by: James Morris <james.morris@microsoft.com>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Nayna Jain 2018-12-09 01:57:00 +05:30 committed by Mimi Zohar
parent 9dc92c4517
commit 60740accf7
3 changed files with 86 additions and 24 deletions
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67
security/integrity/digsig.c
View File

@ -82,8 +82,7 @@ static int __integrity_init_keyring(const unsigned int id, key_perm_t perm,
keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0),
KGIDT_INIT(0), cred, perm,
KEY_ALLOC_NOT_IN_QUOTA,
restriction, NULL);
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",
@ -121,16 +120,38 @@ int __init integrity_init_keyring(const unsigned int id)
return __integrity_init_keyring(id, perm, restriction);
}
int __init integrity_load_x509(const unsigned int id, const char *path)
int __init integrity_add_key(const unsigned int id, const void *data,
off_t size, key_perm_t perm)
{
key_ref_t key;
void *data;
loff_t size;
int rc;
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 rc;
}
int __init integrity_load_x509(const unsigned int id, const char *path)
{
void *data;
loff_t size;
int rc;
key_perm_t perm;
rc = kernel_read_file_from_path(path, &data, &size, 0,
READING_X509_CERTIFICATE);
if (rc < 0) {
@ -138,23 +159,21 @@ 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);
}

20
security/integrity/integrity.h
View File

@ -154,6 +154,8 @@ 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,
@ -167,6 +169,14 @@ 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
@ -223,3 +233,13 @@ 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

23
security/integrity/platform_certs/platform_keyring.c
View File

@ -14,6 +14,29 @@
#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.
*/