From: Roberto Sassu <roberto.sassu@huaweicloud.com>
To: dhowells@redhat.com, dwmw2@infradead.org,
herbert@gondor.apana.org.au, davem@davemloft.net
Cc: linux-kernel@vger.kernel.org, keyrings@vger.kernel.org,
linux-crypto@vger.kernel.org, zohar@linux.ibm.com,
linux-integrity@vger.kernel.org,
Roberto Sassu <roberto.sassu@huawei.com>
Subject: [PATCH v2 14/14] KEYS: Introduce load_pgp_public_keyring()
Date: Sun, 18 Aug 2024 18:57:56 +0200 [thread overview]
Message-ID: <20240818165756.629203-15-roberto.sassu@huaweicloud.com> (raw)
In-Reply-To: <20240818165756.629203-1-roberto.sassu@huaweicloud.com>
From: Roberto Sassu <roberto.sassu@huawei.com>
Preload PGP keys from 'pubring.gpg', placed in certs/ of the kernel source
directory.
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
---
certs/Kconfig | 11 +++++++++++
certs/Makefile | 7 +++++++
certs/system_certificates.S | 18 ++++++++++++++++++
certs/system_keyring.c | 23 +++++++++++++++++++++++
4 files changed, 59 insertions(+)
diff --git a/certs/Kconfig b/certs/Kconfig
index 78307dc25559..9b7ece1e45fa 100644
--- a/certs/Kconfig
+++ b/certs/Kconfig
@@ -154,4 +154,15 @@ config SYSTEM_BLACKLIST_AUTH_UPDATE
keyring. The PKCS#7 signature of the description is set in the key
payload. Blacklist keys cannot be removed.
+config PGP_PRELOAD_PUBLIC_KEYS
+ bool "Preload PGP public keys"
+ depends on SYSTEM_TRUSTED_KEYRING
+ select PGP_PRELOAD
+ default n
+ help
+ Load at boot time the PGP public keys from a reserved area (populated
+ with the content of 'certs/pubring.gpg' provided at kernel build
+ time), and add them to the built-in keyring. Invalid keys are ignored
+ and the loading continues.
+
endmenu
diff --git a/certs/Makefile b/certs/Makefile
index 1094e3860c2a..7a3d68441e09 100644
--- a/certs/Makefile
+++ b/certs/Makefile
@@ -31,6 +31,13 @@ $(obj)/system_certificates.o: $(obj)/x509_certificate_list
$(obj)/x509_certificate_list: $(CONFIG_SYSTEM_TRUSTED_KEYS) $(obj)/extract-cert FORCE
$(call if_changed,extract_certs)
+ifdef CONFIG_PGP_PRELOAD_PUBLIC_KEYS
+ifeq ($(shell ls $(srctree)/certs/pubring.gpg 2> /dev/null), $(srctree)/certs/pubring.gpg)
+AFLAGS_system_certificates.o := -DHAVE_PUBRING_GPG
+$(obj)/system_certificates.o: $(srctree)/certs/pubring.gpg
+endif
+endif
+
targets += x509_certificate_list
# If module signing is requested, say by allyesconfig, but a key has not been
diff --git a/certs/system_certificates.S b/certs/system_certificates.S
index 003e25d4a17e..b3cbf0811e3f 100644
--- a/certs/system_certificates.S
+++ b/certs/system_certificates.S
@@ -44,3 +44,21 @@ module_cert_size:
#else
.long __module_cert_end - __module_cert_start
#endif
+
+ .align 8
+ .globl pgp_public_keys
+pgp_public_keys:
+__pgp_key_list_start:
+#ifdef HAVE_PUBRING_GPG
+ .incbin "certs/pubring.gpg"
+#endif
+__pgp_key_list_end:
+
+ .align 8
+ .globl pgp_public_keys_size
+pgp_public_keys_size:
+#ifdef CONFIG_64BIT
+ .quad __pgp_key_list_end - __pgp_key_list_start
+#else
+ .long __pgp_key_list_end - __pgp_key_list_start
+#endif
diff --git a/certs/system_keyring.c b/certs/system_keyring.c
index db0fde36a71b..7b4c1dfa7fb3 100644
--- a/certs/system_keyring.c
+++ b/certs/system_keyring.c
@@ -32,6 +32,10 @@ static struct key *platform_trusted_keys;
extern __initconst const u8 system_certificate_list[];
extern __initconst const unsigned long system_certificate_list_size;
extern __initconst const unsigned long module_cert_size;
+#ifdef CONFIG_PGP_PRELOAD_PUBLIC_KEYS
+extern __initconst const u8 pgp_public_keys[];
+extern __initconst const unsigned long pgp_public_keys_size;
+#endif
/**
* restrict_link_by_builtin_trusted - Restrict keyring addition by built-in CA
@@ -268,6 +272,15 @@ __init int load_module_cert(struct key *keyring)
if (!IS_ENABLED(CONFIG_IMA_APPRAISE_MODSIG))
return 0;
+#ifdef CONFIG_PGP_PRELOAD_PUBLIC_KEYS
+ pr_notice("Load PGP public keys to keyring %s\n", keyring->description);
+
+ if (preload_pgp_keys(pgp_public_keys,
+ pgp_public_keys_size,
+ keyring) < 0)
+ pr_err("Can't load PGP public keys\n");
+#endif
+
pr_notice("Loading compiled-in module X.509 certificates\n");
return x509_load_certificate_list(system_certificate_list,
@@ -292,6 +305,16 @@ static __init int load_system_certificate_list(void)
size = system_certificate_list_size - module_cert_size;
#endif
+#ifdef CONFIG_PGP_PRELOAD_PUBLIC_KEYS
+ pr_notice("Load PGP public keys to keyring %s\n",
+ builtin_trusted_keys->description);
+
+ if (preload_pgp_keys(pgp_public_keys,
+ pgp_public_keys_size,
+ builtin_trusted_keys) < 0)
+ pr_err("Can't load PGP public keys\n");
+#endif
+
return x509_load_certificate_list(p, size, builtin_trusted_keys);
}
late_initcall(load_system_certificate_list);
--
2.34.1
next prev parent reply other threads:[~2024-08-18 17:02 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-18 16:57 [PATCH v2 00/14] KEYS: Add support for PGP keys and signatures Roberto Sassu
2024-08-18 16:57 ` [PATCH v2 01/14] mpi: Introduce mpi_key_length() Roberto Sassu
2024-08-19 17:55 ` Jarkko Sakkinen
2024-08-18 16:57 ` [PATCH v2 02/14] rsa: add parser of raw format Roberto Sassu
2024-08-19 17:56 ` Jarkko Sakkinen
2024-08-18 16:57 ` [PATCH v2 03/14] PGPLIB: PGP definitions (RFC 4880) Roberto Sassu
2024-08-18 16:57 ` [PATCH v2 04/14] PGPLIB: Basic packet parser Roberto Sassu
2024-08-19 14:34 ` Jeff Johnson
2024-08-19 15:06 ` Roberto Sassu
2024-08-18 16:57 ` [PATCH v2 05/14] PGPLIB: Signature parser Roberto Sassu
2024-08-18 16:57 ` [PATCH v2 06/14] KEYS: PGP data parser Roberto Sassu
2024-08-19 14:36 ` Jeff Johnson
2024-08-19 14:38 ` Roberto Sassu
2024-08-18 16:57 ` [PATCH v2 07/14] KEYS: Provide PGP key description autogeneration Roberto Sassu
2024-08-18 16:57 ` [PATCH v2 08/14] KEYS: PGP-based public key signature verification Roberto Sassu
2024-08-18 16:57 ` [PATCH v2 09/14] KEYS: Retry asym key search with partial ID in restrict_link_by_signature() Roberto Sassu
2024-08-18 16:57 ` [PATCH v2 10/14] KEYS: Calculate key digest and get signature of the key Roberto Sassu
2024-08-18 16:57 ` [PATCH v2 11/14] verification: introduce verify_pgp_signature() Roberto Sassu
2024-08-18 16:57 ` [PATCH v2 12/14] PGP: Provide a key type for testing PGP signatures Roberto Sassu
2024-08-19 14:37 ` Jeff Johnson
2024-08-18 16:57 ` [PATCH v2 13/14] KEYS: Provide a function to load keys from a PGP keyring blob Roberto Sassu
2024-08-18 16:57 ` Roberto Sassu [this message]
2024-08-19 15:08 ` [PATCH v2 00/14] KEYS: Add support for PGP keys and signatures Jonathan McDowell
2024-08-19 15:15 ` Roberto Sassu
2024-08-20 14:12 ` Jonathan McDowell
2024-08-20 14:14 ` Roberto Sassu
2024-09-10 14:36 ` Roberto Sassu
2024-09-10 14:51 ` Roberto Sassu
2024-09-10 15:16 ` Jonathan McDowell
2024-09-11 9:55 ` Roberto Sassu
2024-08-19 16:30 ` Roberto Sassu
2024-08-19 17:53 ` Jarkko Sakkinen
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