Move x509_check_for_self_signed as a common helper function that can be shared by legacy crypto lib and MbedTLS implementation.
Signed-off-by: Raymond Mao raymond.mao@linaro.org Reviewed-by: Ilias Apalodimas ilias.apalodimas@linaro.org --- Changes in v4 - Initial patch. Changes in v5 - Removed authorship. Changes in v6 - None. Changes in v7 - None. Changes in v8 - None
lib/crypto/Makefile | 1 + lib/crypto/x509_helper.c | 64 ++++++++++++++++++++++++++++++++++++ lib/crypto/x509_public_key.c | 56 +------------------------------ 3 files changed, 66 insertions(+), 55 deletions(-) create mode 100644 lib/crypto/x509_helper.c
diff --git a/lib/crypto/Makefile b/lib/crypto/Makefile index 4ad1849040d..946cc3a7b59 100644 --- a/lib/crypto/Makefile +++ b/lib/crypto/Makefile @@ -37,6 +37,7 @@ x509_key_parser-y := \ x509.asn1.o \ x509_akid.asn1.o \ x509_cert_parser.o \ + x509_helper.o \ x509_public_key.o
$(obj)/x509_cert_parser.o: \ diff --git a/lib/crypto/x509_helper.c b/lib/crypto/x509_helper.c new file mode 100644 index 00000000000..87e8ff67ae1 --- /dev/null +++ b/lib/crypto/x509_helper.c @@ -0,0 +1,64 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * X509 helper functions + * + * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ +#include <linux/err.h> +#include <crypto/public_key.h> +#include <crypto/x509_parser.h> + +/* + * Check for self-signedness in an X.509 cert and if found, check the signature + * immediately if we can. + */ +int x509_check_for_self_signed(struct x509_certificate *cert) +{ + int ret = 0; + + if (cert->raw_subject_size != cert->raw_issuer_size || + memcmp(cert->raw_subject, cert->raw_issuer, + cert->raw_issuer_size)) + goto not_self_signed; + + if (cert->sig->auth_ids[0] || cert->sig->auth_ids[1]) { + /* + * If the AKID is present it may have one or two parts. If + * both are supplied, both must match. + */ + bool a = asymmetric_key_id_same(cert->skid, + cert->sig->auth_ids[1]); + bool b = asymmetric_key_id_same(cert->id, + cert->sig->auth_ids[0]); + + if (!a && !b) + goto not_self_signed; + + ret = -EKEYREJECTED; + if (((a && !b) || (b && !a)) && + cert->sig->auth_ids[0] && cert->sig->auth_ids[1]) + goto out; + } + + ret = -EKEYREJECTED; + if (strcmp(cert->pub->pkey_algo, cert->sig->pkey_algo)) + goto out; + + ret = public_key_verify_signature(cert->pub, cert->sig); + if (ret == -ENOPKG) { + cert->unsupported_sig = true; + goto not_self_signed; + } + if (ret < 0) + goto out; + + pr_devel("Cert Self-signature verified"); + cert->self_signed = true; + +out: + return ret; + +not_self_signed: + return 0; +} diff --git a/lib/crypto/x509_public_key.c b/lib/crypto/x509_public_key.c index a10145a7cdc..4ba13c1adc3 100644 --- a/lib/crypto/x509_public_key.c +++ b/lib/crypto/x509_public_key.c @@ -139,61 +139,7 @@ error: return ret; }
-/* - * Check for self-signedness in an X.509 cert and if found, check the signature - * immediately if we can. - */ -int x509_check_for_self_signed(struct x509_certificate *cert) -{ - int ret = 0; - - pr_devel("==>%s()\n", __func__); - - if (cert->raw_subject_size != cert->raw_issuer_size || - memcmp(cert->raw_subject, cert->raw_issuer, - cert->raw_issuer_size) != 0) - goto not_self_signed; - - if (cert->sig->auth_ids[0] || cert->sig->auth_ids[1]) { - /* If the AKID is present it may have one or two parts. If - * both are supplied, both must match. - */ - bool a = asymmetric_key_id_same(cert->skid, cert->sig->auth_ids[1]); - bool b = asymmetric_key_id_same(cert->id, cert->sig->auth_ids[0]); - - if (!a && !b) - goto not_self_signed; - - ret = -EKEYREJECTED; - if (((a && !b) || (b && !a)) && - cert->sig->auth_ids[0] && cert->sig->auth_ids[1]) - goto out; - } - - ret = -EKEYREJECTED; - if (strcmp(cert->pub->pkey_algo, cert->sig->pkey_algo) != 0) - goto out; - - ret = public_key_verify_signature(cert->pub, cert->sig); - if (ret < 0) { - if (ret == -ENOPKG) { - cert->unsupported_sig = true; - ret = 0; - } - goto out; - } - - pr_devel("Cert Self-signature verified"); - cert->self_signed = true; - -out: - pr_devel("<==%s() = %d\n", __func__, ret); - return ret; - -not_self_signed: - pr_devel("<==%s() = 0 [not]\n", __func__); - return 0; -} +#endif /* !CONFIG_IS_ENABLED(MBEDTLS_LIB_X509) */
#ifndef __UBOOT__ /*