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-rw-r--r--certs/system_keyring.c35
1 files changed, 34 insertions, 1 deletions
diff --git a/certs/system_keyring.c b/certs/system_keyring.c
index 08ea542c8096..05b66ce9d1c9 100644
--- a/certs/system_keyring.c
+++ b/certs/system_keyring.c
@@ -89,7 +89,10 @@ static __init struct key_restriction *get_builtin_and_secondary_restriction(void
if (!restriction)
panic("Can't allocate secondary trusted keyring restriction\n");
- restriction->check = restrict_link_by_builtin_and_secondary_trusted;
+ if (IS_ENABLED(CONFIG_INTEGRITY_MACHINE_KEYRING))
+ restriction->check = restrict_link_by_builtin_secondary_and_machine;
+ else
+ restriction->check = restrict_link_by_builtin_and_secondary_trusted;
return restriction;
}
@@ -98,6 +101,36 @@ static __init struct key_restriction *get_builtin_and_secondary_restriction(void
void __init set_machine_trusted_keys(struct key *keyring)
{
machine_trusted_keys = keyring;
+
+ if (key_link(secondary_trusted_keys, machine_trusted_keys) < 0)
+ panic("Can't link (machine) trusted keyrings\n");
+}
+
+/**
+ * restrict_link_by_builtin_secondary_and_machine - Restrict keyring addition.
+ * @dest_keyring: Keyring being linked to.
+ * @type: The type of key being added.
+ * @payload: The payload of the new key.
+ * @restrict_key: A ring of keys that can be used to vouch for the new cert.
+ *
+ * Restrict the addition of keys into a keyring based on the key-to-be-added
+ * being vouched for by a key in either the built-in, the secondary, or
+ * the machine keyrings.
+ */
+int restrict_link_by_builtin_secondary_and_machine(
+ struct key *dest_keyring,
+ const struct key_type *type,
+ const union key_payload *payload,
+ struct key *restrict_key)
+{
+ if (machine_trusted_keys && type == &key_type_keyring &&
+ dest_keyring == secondary_trusted_keys &&
+ payload == &machine_trusted_keys->payload)
+ /* Allow the machine keyring to be added to the secondary */
+ return 0;
+
+ return restrict_link_by_builtin_and_secondary_trusted(dest_keyring, type,
+ payload, restrict_key);
}
#endif