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Tue, 26 Jan 2021 17:04:02 GMT Received: from b01ledav002.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4DA24124054; Tue, 26 Jan 2021 17:04:02 +0000 (GMT) Received: from b01ledav002.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2E125124055; Tue, 26 Jan 2021 17:04:02 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b01ledav002.gho.pok.ibm.com (Postfix) with ESMTP; Tue, 26 Jan 2021 17:04:02 +0000 (GMT) From: Stefan Berger To: dhowells@redhat.com, keyrings@vger.kernel.org Cc: linux-kernel@vger.kernel.org, herbert@gondor.apana.org.au, davem@davemloft.net, linux-crypto@vger.kernel.org, patrick@puiterwijk.org, Stefan Berger Subject: [PATCH 1/3] x509: Add support for parsing x509 certs with NIST p256 keys Date: Tue, 26 Jan 2021 12:03:57 -0500 Message-Id: <20210126170359.363969-2-stefanb@linux.vnet.ibm.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210126170359.363969-1-stefanb@linux.vnet.ibm.com> References: <20210126170359.363969-1-stefanb@linux.vnet.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.343, 18.0.737 definitions=2021-01-26_09:2021-01-26,2021-01-26 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1011 phishscore=0 impostorscore=0 suspectscore=0 malwarescore=0 mlxlogscore=999 adultscore=0 bulkscore=0 lowpriorityscore=0 mlxscore=0 spamscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101260086 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org From: Stefan Berger This patch adds support for parsing of x509 certificates that contain NIST P256 keys that have been signed by a CA using any of the current SHA hash algorithms. Since self-signed certificates are verified, the ecc math for signature verification is also added. Signed-off-by: Stefan Berger --- crypto/Makefile | 9 +- crypto/asymmetric_keys/public_key.c | 16 ++ crypto/asymmetric_keys/x509_cert_parser.c | 39 ++- crypto/ecc.c | 297 ++++++++++++++++++++++ crypto/ecc.h | 2 + crypto/ecc_curve_defs.h | 4 + crypto/eccsignature.asn1 | 4 + include/linux/oid_registry.h | 5 + 8 files changed, 374 insertions(+), 2 deletions(-) create mode 100644 crypto/eccsignature.asn1 diff --git a/crypto/Makefile b/crypto/Makefile index b279483fba50..09ae06235274 100644 --- a/crypto/Makefile +++ b/crypto/Makefile @@ -50,6 +50,14 @@ sm2_generic-y += sm2.o obj-$(CONFIG_CRYPTO_SM2) += sm2_generic.o +$(obj)/eccsignature.asn1.o: $(obj)/eccsignature.asn1.c $(obj)/eccsignature.asn1.h +$(obj)/ecc.o: $(obj)/sm2signature.asn1.h + +ecc_generic-y += eccsignature.asn1.o +ecc_generic-y += ecc.o + +obj-$(CONFIG_CRYPTO_ECC) += ecc_generic.o + crypto_acompress-y := acompress.o crypto_acompress-y += scompress.o obj-$(CONFIG_CRYPTO_ACOMP2) += crypto_acompress.o @@ -172,7 +180,6 @@ obj-$(CONFIG_CRYPTO_USER_API_RNG) += algif_rng.o obj-$(CONFIG_CRYPTO_USER_API_AEAD) += algif_aead.o obj-$(CONFIG_CRYPTO_ZSTD) += zstd.o obj-$(CONFIG_CRYPTO_OFB) += ofb.o -obj-$(CONFIG_CRYPTO_ECC) += ecc.o obj-$(CONFIG_CRYPTO_ESSIV) += essiv.o obj-$(CONFIG_CRYPTO_CURVE25519) += curve25519-generic.o diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c index 8892908ad58c..0fcbaec0ded0 100644 --- a/crypto/asymmetric_keys/public_key.c +++ b/crypto/asymmetric_keys/public_key.c @@ -90,6 +90,22 @@ int software_key_determine_akcipher(const char *encoding, return 0; } + if (strcmp(encoding, "x962") == 0) { + enum OID oid; + + if (pkey->paramlen < 2) + return -EINVAL; + + oid = look_up_OID(pkey->params + 2, pkey->paramlen - 2); + switch (oid) { + case OID_id_prime256v1: + strcpy(alg_name, "nist_p256"); + return 0; + default: + return -EINVAL; + } + } + return -ENOPKG; } diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c index 52c9b455fc7d..44bae5ccb475 100644 --- a/crypto/asymmetric_keys/x509_cert_parser.c +++ b/crypto/asymmetric_keys/x509_cert_parser.c @@ -203,6 +203,26 @@ int x509_note_pkey_algo(void *context, size_t hdrlen, default: return -ENOPKG; /* Unsupported combination */ + 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_md4WithRSAEncryption: ctx->cert->sig->hash_algo = "md4"; goto rsa_pkcs1; @@ -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; @@ -471,6 +497,17 @@ int x509_extract_key_data(void *context, size_t hdrlen, break; case OID_id_ecPublicKey: ctx->cert->pub->pkey_algo = "sm2"; + if (ctx->params_size > 2) { + enum OID oid = look_up_OID(ctx->params + 2, + ctx->params_size - 2); + switch (oid) { + case OID_id_prime256v1: + ctx->cert->pub->pkey_algo = "ecdsa"; + break; + default: + break; + } + } break; default: return -ENOPKG; diff --git a/crypto/ecc.c b/crypto/ecc.c index c80aa25994a0..fb8370720350 100644 --- a/crypto/ecc.c +++ b/crypto/ecc.c @@ -29,13 +29,17 @@ #include #include #include +#include +#include #include #include #include #include +#include #include "ecc.h" #include "ecc_curve_defs.h" +#include "eccsignature.asn1.h" typedef struct { u64 m_low; @@ -840,6 +844,21 @@ static void vli_mod_mult_fast(u64 *result, const u64 *left, const u64 *right, vli_mmod_fast(result, product, curve_prime, ndigits); } +/* Computes result = value % curve_prime. + * Expands value to double the size for vli_mmod_fast. + */ +static void vli_mod_fast(u64 *result, const u64 *val, const u64 *curve_prime, + unsigned int ndigits) +{ + u64 tmp[2 * ECC_MAX_DIGITS]; + + memcpy(tmp, val, ndigits << ECC_DIGITS_TO_BYTES_SHIFT); + memset(&tmp[ndigits], 0, + (ndigits << 1) << ECC_DIGITS_TO_BYTES_SHIFT); + + vli_mmod_fast(result, tmp, curve_prime, ndigits); +} + /* Computes result = left^2 % curve_prime. */ static void vli_mod_square_fast(u64 *result, const u64 *left, const u64 *curve_prime, unsigned int ndigits) @@ -1542,4 +1561,282 @@ int crypto_ecdh_shared_secret(unsigned int curve_id, unsigned int ndigits, } EXPORT_SYMBOL(crypto_ecdh_shared_secret); +struct ecc_ctx { + unsigned int curve_id; + const struct ecc_curve *curve; + struct ecc_point *pub_key; +}; + +struct ecdsa_signature_ctx { + const struct ecc_curve *curve; + u64 r[ECC_MAX_DIGITS]; + u64 s[ECC_MAX_DIGITS]; +}; + +/* + * Get the r and s components of a signature from the X509 certificate. + */ +static int ecc_get_signature_rs(u64 *dest, size_t hdrlen, unsigned char tag, + const void *value, size_t vlen, + unsigned int ndigits) +{ + size_t keylen = ndigits * sizeof(u64); + ssize_t diff = vlen - keylen; + const char *d = value; + u8 rs[ECC_MAX_BYTES]; + + if (!value || !vlen) + return -EINVAL; + + /* diff = 0: 'value' has exacly the right size + * diff > 0: 'value' has too many bytes; '1' leading zero is allowed that + * makes the value a positive integer; error on more + * diff < 0: 'value' is missing leading zeros, which we add + */ + if (diff > 0) { + /* skip over leading zeros that make 'value' a positive int */ + if (*d == 0) { + vlen -= 1; + diff--; + d++; + } + if (diff) + return -EINVAL; + } + if (-diff >= keylen) + return -EINVAL; + + if (diff) { + /* leading zeros not given in 'value' */ + memset(rs, 0, -diff); + } + + memcpy(&rs[-diff], d, vlen); + + ecc_swap_digits((u64 *)rs, dest, ndigits); + + return 0; +} + +int ecc_get_signature_r(void *context, size_t hdrlen, unsigned char tag, + const void *value, size_t vlen) +{ + struct ecdsa_signature_ctx *sig = context; + + return ecc_get_signature_rs(sig->r, hdrlen, tag, value, vlen, + sig->curve->g.ndigits); +} + +int ecc_get_signature_s(void *context, size_t hdrlen, unsigned char tag, + const void *value, size_t vlen) +{ + struct ecdsa_signature_ctx *sig = context; + + return ecc_get_signature_rs(sig->s, hdrlen, tag, value, vlen, + sig->curve->g.ndigits); +} + +static int _ecdsa_verify(struct ecc_ctx *ctx, const u64 *hash, + const u64 *r, const u64 *s) +{ + const struct ecc_curve *curve = ctx->curve; + unsigned int ndigits = curve->g.ndigits; + u64 s1[ECC_MAX_DIGITS]; + u64 u1[ECC_MAX_DIGITS]; + u64 u2[ECC_MAX_DIGITS]; + u64 x1[ECC_MAX_DIGITS]; + u64 y1[ECC_MAX_DIGITS]; + struct ecc_point res = ECC_POINT_INIT(x1, y1, ndigits); + + /* 0 < r < n and 0 < s < n */ + if (vli_is_zero(r, ndigits) || vli_cmp(r, curve->n, ndigits) >= 0 || + vli_is_zero(s, ndigits) || vli_cmp(s, curve->n, ndigits) >= 0) + return -EBADMSG; + + /* hash is given */ + pr_devel("hash : %016llx %016llx ... %016llx\n", + hash[ndigits - 1], hash[ndigits - 2], hash[0]); + + /* s1 = (s^-1) mod n */ + vli_mod_inv(s1, s, curve->n, ndigits); + /* u1 = (hash * s1) mod n */ + vli_mod_mult_slow(u1, hash, s1, curve->n, ndigits); + /* u2 = (r * s1) mod n */ + vli_mod_mult_slow(u2, r, s1, curve->n, ndigits); + /* res = u1*G + u2 * pub_key */ + ecc_point_mult_shamir(&res, u1, &curve->g, u2, ctx->pub_key, curve); + + /* res.x = res.x mod n (if res.x > order) */ + if (unlikely(vli_cmp(res.x, curve->n, ndigits) == 1)) + vli_mod_fast(res.x, res.x, curve->n, ndigits); + + if (!vli_cmp(res.x, r, ndigits)) + return 0; + + return -EKEYREJECTED; +} + +/* + * Verify and ECDSA signature. + */ +static int ecdsa_verify(struct akcipher_request *req) +{ + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); + struct ecc_ctx *ctx = akcipher_tfm_ctx(tfm); + size_t keylen = ctx->curve->g.ndigits * sizeof(u64); + struct ecdsa_signature_ctx sig_ctx = { + .curve = ctx->curve, + }; + u8 rawhash[ECC_MAX_BYTES]; + u64 hash[ECC_MAX_DIGITS]; + unsigned char *buffer; + ssize_t diff; + int ret; + + if (unlikely(!ctx->pub_key)) + return -EINVAL; + + buffer = kmalloc(req->src_len + req->dst_len, GFP_KERNEL); + if (!buffer) + return -ENOMEM; + + sg_pcopy_to_buffer(req->src, + sg_nents_for_len(req->src, req->src_len + req->dst_len), + buffer, req->src_len + req->dst_len, 0); + + ret = asn1_ber_decoder(&eccsignature_decoder, &sig_ctx, + buffer, req->src_len); + if (ret < 0) + goto error; + + /* if the hash is shorter then we will add leading zeros to fit to ndigits */ + diff = keylen - req->dst_len; + if (diff >= 0) { + if (diff) + memset(rawhash, 0, diff); + memcpy(&rawhash[diff], buffer + req->src_len, req->dst_len); + } else if (diff < 0) { + /* given hash is longer, we take the left-most bytes */ + memcpy(&rawhash, buffer + req->src_len, keylen); + } + + ecc_swap_digits((u64 *)rawhash, hash, ctx->curve->g.ndigits); + + ret = _ecdsa_verify(ctx, hash, sig_ctx.r, sig_ctx.s); + +error: + kfree(buffer); + + return ret; +} + +static int ecc_ec_ctx_init(struct ecc_ctx *ctx, unsigned int curve_id) +{ + ctx->curve_id = curve_id; + ctx->curve = ecc_get_curve(curve_id); + if (!ctx->curve) + return -EINVAL; + + return 0; +} + +static void ecc_ec_ctx_deinit(struct ecc_ctx *ctx) +{ + ecc_free_point(ctx->pub_key); + ctx->pub_key = NULL; +} + +static int ecc_ec_ctx_reset(struct ecc_ctx *ctx) +{ + unsigned int curve_id = ctx->curve_id; + + ecc_ec_ctx_deinit(ctx); + return ecc_ec_ctx_init(ctx, curve_id); +} + +/* + * Set the public key given the raw uncompressed key data from an X509 + * certificate. The key data contain the concatenated X and Y coordinates of + * the public key. + */ +static int ecc_set_pub_key(struct crypto_akcipher *tfm, + const void *key, unsigned int keylen) +{ + struct ecc_ctx *ctx = akcipher_tfm_ctx(tfm); + const unsigned char *d = key; + const u64 *digits = (const u64 *)&d[1]; + unsigned int ndigits; + int ret; + + ret = ecc_ec_ctx_reset(ctx); + if (ret < 0) + return ret; + + if (keylen < 1 || (((keylen - 1) >> 1) % sizeof(u64)) != 0) + return -EINVAL; + /* we only accept uncompressed format */ + if (d[0] != 4) + return -EINVAL; + + keylen--; + ndigits = (keylen >> 1) / sizeof(u64); + if (ndigits != ctx->curve->g.ndigits) + return -EINVAL; + + ctx->pub_key = ecc_alloc_point(ndigits); + if (!ctx->pub_key) + return -ENOMEM; + + ecc_swap_digits(digits, ctx->pub_key->x, ndigits); + ecc_swap_digits(&digits[ndigits], ctx->pub_key->y, ndigits); + return ecc_is_pubkey_valid_full(ctx->curve, ctx->pub_key); +} + +static void ecc_exit_tfm(struct crypto_akcipher *tfm) +{ + struct ecc_ctx *ctx = akcipher_tfm_ctx(tfm); + + ecc_ec_ctx_deinit(ctx); +} + +static unsigned int ecc_nist_p256_max_size(struct crypto_akcipher *tfm) +{ + return NIST_P256_KEY_SIZE; +} + +static int ecc_nist_p256_init_tfm(struct crypto_akcipher *tfm) +{ + struct ecc_ctx *ctx = akcipher_tfm_ctx(tfm); + + return ecc_ec_ctx_init(ctx, ECC_CURVE_NIST_P256); +} + +static struct akcipher_alg ecc_nist_p256 = { + .verify = ecdsa_verify, + .set_pub_key = ecc_set_pub_key, + .max_size = ecc_nist_p256_max_size, + .init = ecc_nist_p256_init_tfm, + .exit = ecc_exit_tfm, + .base = { + .cra_name = "nist_p256", + .cra_driver_name = "ecc-nist-p256", + .cra_priority = 100, + .cra_module = THIS_MODULE, + .cra_ctxsize = sizeof(struct ecc_ctx), + }, +}; + +static int ecc_init(void) +{ + return crypto_register_akcipher(&ecc_nist_p256); +} + +static void ecc_exit(void) +{ + crypto_unregister_akcipher(&ecc_nist_p256); +} + +subsys_initcall(ecc_init); +module_exit(ecc_exit); + MODULE_LICENSE("Dual BSD/GPL"); diff --git a/crypto/ecc.h b/crypto/ecc.h index d4e546b9ad79..26d7c83908bc 100644 --- a/crypto/ecc.h +++ b/crypto/ecc.h @@ -33,6 +33,8 @@ #define ECC_DIGITS_TO_BYTES_SHIFT 3 +#define ECC_MAX_BYTES (ECC_MAX_DIGITS << ECC_DIGITS_TO_BYTES_SHIFT) + /** * struct ecc_point - elliptic curve point in affine coordinates * diff --git a/crypto/ecc_curve_defs.h b/crypto/ecc_curve_defs.h index 69be6c7d228f..562651f28ef5 100644 --- a/crypto/ecc_curve_defs.h +++ b/crypto/ecc_curve_defs.h @@ -28,6 +28,8 @@ static struct ecc_curve nist_p192 = { .b = nist_p192_b }; +#define NIST_P192_KEY_SIZE 24 + /* NIST P-256: a = p - 3 */ static u64 nist_p256_g_x[] = { 0xF4A13945D898C296ull, 0x77037D812DEB33A0ull, 0xF8BCE6E563A440F2ull, 0x6B17D1F2E12C4247ull }; @@ -54,4 +56,6 @@ static struct ecc_curve nist_p256 = { .b = nist_p256_b }; +#define NIST_P256_KEY_SIZE 32 + #endif diff --git a/crypto/eccsignature.asn1 b/crypto/eccsignature.asn1 new file mode 100644 index 000000000000..e6c82381f19d --- /dev/null +++ b/crypto/eccsignature.asn1 @@ -0,0 +1,4 @@ +ECDSASignature ::= SEQUENCE { + r INTEGER ({ ecc_get_signature_r }), + s INTEGER ({ ecc_get_signature_s }) +} diff --git a/include/linux/oid_registry.h b/include/linux/oid_registry.h index 4462ed2c18cd..9060f19c80eb 100644 --- a/include/linux/oid_registry.h +++ b/include/linux/oid_registry.h @@ -21,6 +21,11 @@ enum OID { OID_id_dsa, /* 1.2.840.10040.4.1 */ OID_id_ecdsa_with_sha1, /* 1.2.840.10045.4.1 */ OID_id_ecPublicKey, /* 1.2.840.10045.2.1 */ + OID_id_prime256v1, /* 1.2.840.10045.3.1.7 */ + OID_id_ecdsa_with_sha224, /* 1.2.840.10045.4.3.1 */ + OID_id_ecdsa_with_sha256, /* 1.2.840.10045.4.3.2 */ + OID_id_ecdsa_with_sha384, /* 1.2.840.10045.4.3.3 */ + OID_id_ecdsa_with_sha512, /* 1.2.840.10045.4.3.4 */ /* PKCS#1 {iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-1(1)} */ OID_rsaEncryption, /* 1.2.840.113549.1.1.1 */