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From fb2ac204a70da565de9ef9a9d6d69a40c2d59727 Mon Sep 17 00:00:00 2001
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From: David Howells <dhowells@redhat.com>
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Date: Fri, 5 May 2017 08:21:56 +0100
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Subject: [PATCH] KEYS: Allow unrestricted boot-time addition of keys to
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secondary keyring
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Allow keys to be added to the system secondary certificates keyring during
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kernel initialisation in an unrestricted fashion. Such keys are implicitly
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trusted and don't have their trust chains checked on link.
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This allows keys in the UEFI database to be added in secure boot mode for
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the purposes of module signing.
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Signed-off-by: David Howells <dhowells@redhat.com>
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---
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certs/internal.h | 18 ++++++++++++++++++
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certs/system_keyring.c | 33 +++++++++++++++++++++++++++++++++
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2 files changed, 51 insertions(+)
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create mode 100644 certs/internal.h
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diff --git a/certs/internal.h b/certs/internal.h
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new file mode 100644
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index 0000000..5dcbefb
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--- /dev/null
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+++ b/certs/internal.h
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@@ -0,0 +1,18 @@
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+/* Internal definitions
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+ *
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+ * Copyright (C) 2016 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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+
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+/*
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+ * system_keyring.c
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+ */
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+#ifdef CONFIG_SECONDARY_TRUSTED_KEYRING
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+extern void __init add_trusted_secondary_key(const char *source,
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+ const void *data, size_t len);
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+#endif
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diff --git a/certs/system_keyring.c b/certs/system_keyring.c
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index 6251d1b..5ac8ba6 100644
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--- a/certs/system_keyring.c
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+++ b/certs/system_keyring.c
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@@ -18,6 +18,7 @@
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#include <keys/asymmetric-type.h>
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#include <keys/system_keyring.h>
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#include <crypto/pkcs7.h>
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+#include "internal.h"
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static struct key *builtin_trusted_keys;
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#ifdef CONFIG_SECONDARY_TRUSTED_KEYRING
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@@ -265,3 +266,35 @@ int verify_pkcs7_signature(const void *data, size_t len,
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EXPORT_SYMBOL_GPL(verify_pkcs7_signature);
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#endif /* CONFIG_SYSTEM_DATA_VERIFICATION */
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+
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+#ifdef CONFIG_SECONDARY_TRUSTED_KEYRING
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+/**
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+ * add_trusted_secondary_key - Add to secondary keyring with no validation
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+ * @source: Source of key
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+ * @data: The blob holding the key
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+ * @len: The length of the data blob
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+ *
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+ * Add a key to the secondary keyring without checking its trust chain. This
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+ * is available only during kernel initialisation.
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+ */
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+void __init add_trusted_secondary_key(const char *source,
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+ const void *data, size_t len)
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+{
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+ key_ref_t key;
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+
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+ key = key_create_or_update(make_key_ref(secondary_trusted_keys, 1),
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+ "asymmetric",
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+ NULL, data, len,
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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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+ KEY_ALLOC_BYPASS_RESTRICTION);
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+
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+ if (IS_ERR(key))
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+ pr_err("Problem loading %s X.509 certificate (%ld)\n",
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+ source, PTR_ERR(key));
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+ else
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+ pr_notice("Loaded %s cert '%s' linked to secondary sys keyring\n",
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+ source, key_ref_to_ptr(key)->description);
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+}
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+#endif /* CONFIG_SECONDARY_TRUSTED_KEYRING */
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--
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2.9.3
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