From: Stefan Berger <stef...@linux.ibm.com> Add support for parsing of x509 certificates that contain ECDSA keys, such as NIST P256, that have been signed by a CA using any of the current SHA hash algorithms.
Cc: David Howells <dhowe...@redhat.com> Cc: keyri...@vger.kernel.org Signed-off-by: Stefan Berger <stef...@linux.ibm.com> --- v7->v8: - do not detect key algo using parse_OID() in public_key.c but set pkey_algo to the key type 'ecdsa-nist-p192/256' when parsing cert --- crypto/asymmetric_keys/public_key.c | 4 ++- crypto/asymmetric_keys/x509_cert_parser.c | 34 ++++++++++++++++++++++- crypto/asymmetric_keys/x509_public_key.c | 4 ++- include/linux/oid_registry.h | 2 ++ 4 files changed, 41 insertions(+), 3 deletions(-) diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c index 788a4ba1e2e7..4fefb219bfdc 100644 --- a/crypto/asymmetric_keys/public_key.c +++ b/crypto/asymmetric_keys/public_key.c @@ -14,6 +14,7 @@ #include <linux/slab.h> #include <linux/seq_file.h> #include <linux/scatterlist.h> +#include <linux/asn1.h> #include <keys/asymmetric-subtype.h> #include <crypto/public_key.h> #include <crypto/akcipher.h> @@ -85,7 +86,8 @@ int software_key_determine_akcipher(const char *encoding, return n >= CRYPTO_MAX_ALG_NAME ? -EINVAL : 0; } - if (strcmp(encoding, "raw") == 0) { + if (strcmp(encoding, "raw") == 0 || + strcmp(encoding, "x962") == 0) { strcpy(alg_name, pkey->pkey_algo); return 0; } diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c index 1621ceaf5c95..f5d547c6dfb5 100644 --- a/crypto/asymmetric_keys/x509_cert_parser.c +++ b/crypto/asymmetric_keys/x509_cert_parser.c @@ -227,6 +227,26 @@ int x509_note_pkey_algo(void *context, size_t hdrlen, ctx->cert->sig->hash_algo = "sha224"; goto rsa_pkcs1; + case OID_id_ecdsa_with_sha1: + ctx->cert->sig->hash_algo = "sha1"; + goto ecdsa; + + case OID_id_ecdsa_with_sha224: + ctx->cert->sig->hash_algo = "sha224"; + goto ecdsa; + + case OID_id_ecdsa_with_sha256: + ctx->cert->sig->hash_algo = "sha256"; + goto ecdsa; + + case OID_id_ecdsa_with_sha384: + ctx->cert->sig->hash_algo = "sha384"; + goto ecdsa; + + case OID_id_ecdsa_with_sha512: + ctx->cert->sig->hash_algo = "sha512"; + goto ecdsa; + case OID_gost2012Signature256: ctx->cert->sig->hash_algo = "streebog256"; goto ecrdsa; @@ -255,6 +275,11 @@ int x509_note_pkey_algo(void *context, size_t hdrlen, ctx->cert->sig->encoding = "raw"; ctx->algo_oid = ctx->last_oid; return 0; +ecdsa: + ctx->cert->sig->pkey_algo = "ecdsa"; + ctx->cert->sig->encoding = "x962"; + ctx->algo_oid = ctx->last_oid; + return 0; } /* @@ -276,7 +301,8 @@ int x509_note_signature(void *context, size_t hdrlen, if (strcmp(ctx->cert->sig->pkey_algo, "rsa") == 0 || strcmp(ctx->cert->sig->pkey_algo, "ecrdsa") == 0 || - strcmp(ctx->cert->sig->pkey_algo, "sm2") == 0) { + strcmp(ctx->cert->sig->pkey_algo, "sm2") == 0 || + strcmp(ctx->cert->sig->pkey_algo, "ecdsa") == 0) { /* Discard the BIT STRING metadata */ if (vlen < 1 || *(const u8 *)value != 0) return -EBADMSG; @@ -478,6 +504,12 @@ int x509_extract_key_data(void *context, size_t hdrlen, case OID_sm2: ctx->cert->pub->pkey_algo = "sm2"; break; + case OID_id_prime192v1: + ctx->cert->pub->pkey_algo = "ecdsa-nist-p192"; + break; + case OID_id_prime256v1: + ctx->cert->pub->pkey_algo = "ecdsa-nist-p256"; + break; default: return -ENOPKG; } diff --git a/crypto/asymmetric_keys/x509_public_key.c b/crypto/asymmetric_keys/x509_public_key.c index ae450eb8be14..3d45161b271a 100644 --- a/crypto/asymmetric_keys/x509_public_key.c +++ b/crypto/asymmetric_keys/x509_public_key.c @@ -129,7 +129,9 @@ int x509_check_for_self_signed(struct x509_certificate *cert) } ret = -EKEYREJECTED; - if (strcmp(cert->pub->pkey_algo, cert->sig->pkey_algo) != 0) + if (strcmp(cert->pub->pkey_algo, cert->sig->pkey_algo) != 0 && + (strncmp(cert->pub->pkey_algo, "ecdsa-", 6) != 0 || + strcmp(cert->sig->pkey_algo, "ecdsa") != 0)) goto out; ret = public_key_verify_signature(cert->pub, cert->sig); diff --git a/include/linux/oid_registry.h b/include/linux/oid_registry.h index f32d91895e4d..3583908cf1ca 100644 --- a/include/linux/oid_registry.h +++ b/include/linux/oid_registry.h @@ -20,6 +20,8 @@ enum OID { OID_id_dsa_with_sha1, /* 1.2.840.10030.4.3 */ OID_id_dsa, /* 1.2.840.10040.4.1 */ OID_id_ecPublicKey, /* 1.2.840.10045.2.1 */ + OID_id_prime192v1, /* 1.2.840.10045.3.1.1 */ + OID_id_prime256v1, /* 1.2.840.10045.3.1.7 */ OID_id_ecdsa_with_sha1, /* 1.2.840.10045.4.1 */ OID_id_ecdsa_with_sha224, /* 1.2.840.10045.4.3.1 */ OID_id_ecdsa_with_sha256, /* 1.2.840.10045.4.3.2 */ -- 2.29.2