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Subject[PATCH 2/7] integrity: Load certs to the platform keyring
Date
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>
---
security/integrity/digsig.c | 71 ++++++++++++++--------
security/integrity/integrity.h | 20 ++++++
.../integrity/platform_certs/platform_keyring.c | 23 +++++++
3 files changed, 90 insertions(+), 24 deletions(-)

diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c
index fef2a858300c..ab30c451a19b 100644
--- a/security/integrity/digsig.c
+++ b/security/integrity/digsig.c
@@ -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",
@@ -124,16 +123,38 @@ int __init integrity_init_keyring(const unsigned int id)
return err;
}

-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) {
@@ -141,23 +162,25 @@ 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)
+{
+ int rc;
+
+ if (!data)
+ return -EINVAL;
+
+ pr_info("Loading X.509 certificate: %s\n", source);
+ rc = integrity_add_key(id, data, len, perm);
+
+ return rc;
}
diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
index c2332a44799e..3517d2852a07 100644
--- a/security/integrity/integrity.h
+++ b/security/integrity/integrity.h
@@ -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
diff --git a/security/integrity/platform_certs/platform_keyring.c b/security/integrity/platform_certs/platform_keyring.c
index dfc206bbe2ff..dc49b3b02697 100644
--- a/security/integrity/platform_certs/platform_keyring.c
+++ b/security/integrity/platform_certs/platform_keyring.c
@@ -18,6 +18,29 @@
#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.
*/
--
2.13.6
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