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Date: Thu, 6 Jul 2023 16:42:20 +0200
From: Roberto Sassu <roberto.sassu@...weicloud.com>
To: dhowells@...hat.com, dwmw2@...radead.org,
herbert@...dor.apana.org.au, davem@...emloft.net,
jarkko@...nel.org, song@...nel.org, jolsa@...nel.org,
ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
martin.lau@...ux.dev, yhs@...com, john.fastabend@...il.com,
kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com,
rostedt@...dmis.org, mhiramat@...nel.org, mykolal@...com,
shuah@...nel.org
Cc: linux-kernel@...r.kernel.org, keyrings@...r.kernel.org,
linux-crypto@...r.kernel.org, bpf@...r.kernel.org,
linux-trace-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org, pbrobinson@...il.com,
zbyszek@...waw.pl, zohar@...ux.ibm.com,
linux-integrity@...r.kernel.org, paul@...l-moore.com,
linux-security-module@...r.kernel.org, wiktor@...acode.biz,
devel@...ts.sequoia-pgp.org, gnupg-devel@...pg.org,
ebiggers@...nel.org, Jason@...c4.com, mail@...iej.szmigiero.name,
antony@...nard.ch, konstantin@...uxfoundation.org,
James.Bottomley@...senPartnership.com,
Roberto Sassu <roberto.sassu@...wei.com>
Subject: [RFC][PATCH 07/10] KEYS: asymmetric: Preload user asymmetric keys from a keyring blob
From: Roberto Sassu <roberto.sassu@...wei.com>
Provide a function to load user asymmetric keys from a keyring blob to the
keyring supplied:
int preload_uasym_keys(const u8 *data, size_t data_len,
struct key *keyring);
Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
---
crypto/asymmetric_keys/Makefile | 3 +-
crypto/asymmetric_keys/uasym_key_preload.c | 99 ++++++++++++++++++++++
include/crypto/uasym_keys_sigs.h | 9 ++
3 files changed, 110 insertions(+), 1 deletion(-)
create mode 100644 crypto/asymmetric_keys/uasym_key_preload.c
diff --git a/crypto/asymmetric_keys/Makefile b/crypto/asymmetric_keys/Makefile
index cbaadab0c42..2cb4087f867 100644
--- a/crypto/asymmetric_keys/Makefile
+++ b/crypto/asymmetric_keys/Makefile
@@ -84,4 +84,5 @@ obj-$(CONFIG_UASYM_KEYS_SIGS) += uasym_keys_sigs.o
uasym_keys_sigs-y := \
uasym_parser.o \
uasym_key_parser.o \
- uasym_sig_parser.o
+ uasym_sig_parser.o \
+ uasym_key_preload.o
diff --git a/crypto/asymmetric_keys/uasym_key_preload.c b/crypto/asymmetric_keys/uasym_key_preload.c
new file mode 100644
index 00000000000..dfb3e79cf7d
--- /dev/null
+++ b/crypto/asymmetric_keys/uasym_key_preload.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2011 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2023 Huawei Technologies Duesseldorf GmbH
+ *
+ * Authors:
+ * David Howells <dhowells@...hat.com>
+ * Roberto Sassu <roberto.sassu@...wei.com>
+ *
+ * Load user asymmetric keys from a keyring blob.
+ */
+
+#include <linux/module.h>
+#include <linux/key.h>
+#include <linux/err.h>
+
+#include "uasym_parser.h"
+
+/**
+ * create_uasym_key - Create a user asymmetric key
+ * @data_start: Where the user asymmetric key starts in the blob
+ * @data_end: Where the user asymmetric key ends in the blob
+ * @keyring: The keyring to add the new key to
+ *
+ * Create a user asymmetric key from the supplied buffer.
+ */
+static void __init create_uasym_key(const u8 *data_start, const u8 *data_end,
+ struct key *keyring)
+{
+ key_ref_t key;
+
+ key = key_create_or_update(make_key_ref(keyring, 1), "asymmetric", NULL,
+ data_start, data_end - data_start,
+ ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
+ KEY_USR_VIEW | KEY_USR_READ),
+ KEY_ALLOC_NOT_IN_QUOTA |
+ KEY_ALLOC_BUILT_IN |
+ KEY_ALLOC_BYPASS_RESTRICTION);
+ if (IS_ERR(key)) {
+ pr_notice("Ignoring user asymmetric key, error: %ld\n",
+ PTR_ERR(key));
+ return;
+ }
+
+ pr_notice("Loaded user asymmetric key '%s'\n",
+ key_ref_to_ptr(key)->description);
+
+ key_ref_put(key);
+}
+
+/**
+ * preload_uasym_keys - Load user asymmetric keys from a keyring blob
+ * @data: The keyring blob containing the user asymmetric keys
+ * @data_len: The size of the @data blob
+ * @keyring: The keyring to add the new keys to
+ *
+ * Preload a pack of user_asymmetric keys from a keyring blob.
+ *
+ * The callers should override the current creds if they want the keys to be
+ * owned by someone other than the current process's owner. Keys will not be
+ * accounted towards the owner's quota.
+ *
+ * This function may only be called whilst the kernel is booting.
+ *
+ * Return: Zero on success, a negative value otherwise.
+ */
+int __init preload_uasym_keys(const u8 *data, size_t data_len,
+ struct key *keyring)
+{
+ const u8 *data_ptr = data, *data_end = data + data_len;
+ u8 data_type;
+ u16 num_fields;
+ u64 total_len;
+ int ret;
+
+ kenter("");
+
+ while (data_ptr < data_end) {
+ ret = uasym_parse_hdr(&data_ptr, &data_len, &data_type,
+ &num_fields, &total_len);
+ if (ret < 0) {
+ pr_notice("Unable to parse keyring blob, ret: %d\n",
+ ret);
+ return ret;
+ }
+
+ if (data_type != TYPE_KEY) {
+ data_ptr += total_len;
+ continue;
+ }
+
+ create_uasym_key(data_ptr - sizeof(struct uasym_hdr),
+ data_ptr + total_len, keyring);
+
+ data_ptr += total_len;
+ }
+
+ return 0;
+}
diff --git a/include/crypto/uasym_keys_sigs.h b/include/crypto/uasym_keys_sigs.h
index d594a387766..7270e38275f 100644
--- a/include/crypto/uasym_keys_sigs.h
+++ b/include/crypto/uasym_keys_sigs.h
@@ -30,6 +30,9 @@ extern int uasym_sig_get_digest(struct uasym_sig_message *uasym_sig,
extern int uasym_sig_verify_message(struct uasym_sig_message *uasym_sig,
struct key *keyring);
extern void uasym_sig_free_message(struct uasym_sig_message *uasym_sig);
+
+int __init preload_uasym_keys(const u8 *data, size_t data_len,
+ struct key *keyring);
#else
static inline struct uasym_sig_message *
uasym_sig_parse_message(const u8 *sig_data, size_t sig_len)
@@ -69,5 +72,11 @@ static inline void uasym_sig_free_message(struct uasym_sig_message *uasym_sig)
{
}
+static inline int __init preload_uasym_keys(const u8 *data, size_t data_len,
+ struct key *keyring)
+{
+ return -EOPNOTSUPP;
+}
+
#endif /* CONFIG_UASYM_KEYS_SIGS */
#endif /* _CRYPTO_UASYM_KEYS_SIGS_H */
--
2.34.1
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