From: Lei He <helei.si...@bytedance.com> Implement RSA algorithm by hogweed from nettle. Thus QEMU supports a 'real' RSA backend to handle request from guest side. It's important to test RSA offload case without OS & hardware requirement.
Signed-off-by: Lei He <helei.si...@bytedance.com> Signed-off-by: zhenwei pi <pizhen...@bytedance.com> --- crypto/akcipher-nettle.c.inc | 448 +++++++++++++++++++++++++++++++++++ crypto/akcipher.c | 4 + crypto/meson.build | 4 + crypto/rsakey-builtin.c.inc | 150 ++++++++++++ crypto/rsakey-nettle.c.inc | 141 +++++++++++ crypto/rsakey.c | 43 ++++ crypto/rsakey.h | 96 ++++++++ meson.build | 11 + 8 files changed, 897 insertions(+) create mode 100644 crypto/akcipher-nettle.c.inc create mode 100644 crypto/rsakey-builtin.c.inc create mode 100644 crypto/rsakey-nettle.c.inc create mode 100644 crypto/rsakey.c create mode 100644 crypto/rsakey.h diff --git a/crypto/akcipher-nettle.c.inc b/crypto/akcipher-nettle.c.inc new file mode 100644 index 0000000000..de163cd89e --- /dev/null +++ b/crypto/akcipher-nettle.c.inc @@ -0,0 +1,448 @@ +/* + * QEMU Crypto akcipher algorithms + * + * Copyright (c) 2022 Bytedance + * Author: lei he <helei.si...@bytedance.com> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + * + */ + +#include <stdbool.h> + +#include <nettle/rsa.h> + +#include "qemu/osdep.h" +#include "qemu/host-utils.h" +#include "asn1_decoder.h" +#include "crypto/akcipher.h" +#include "crypto/random.h" +#include "qapi/error.h" +#include "sysemu/cryptodev.h" +#include "rsakey.h" + +typedef struct QCryptoNettleRSA { + QCryptoAkCipher akcipher; + struct rsa_public_key pub; + struct rsa_private_key priv; + QCryptoRSAPaddingAlgorithm padding_alg; + QCryptoHashAlgorithm hash_alg; +} QCryptoNettleRSA; + +static void qcrypto_nettle_rsa_destroy(void *ptr) +{ + QCryptoNettleRSA *rsa = (QCryptoNettleRSA *)ptr; + if (!rsa) { + return; + } + + rsa_public_key_clear(&rsa->pub); + rsa_private_key_clear(&rsa->priv); + g_free(rsa); +} + +static QCryptoAkCipher *qcrypto_nettle_rsa_new( + const QCryptoAkCipherOptionsRSA *opt, + QCryptoAkCipherKeyType type, + const uint8_t *key, size_t keylen, + Error **errp); + +QCryptoAkCipher *qcrypto_akcipher_new(const QCryptoAkCipherOptions *opts, + QCryptoAkCipherKeyType type, + const uint8_t *key, size_t keylen, + Error **errp) +{ + switch (opts->algorithm) { + case QCRYPTO_AKCIPHER_ALG_RSA: + return qcrypto_nettle_rsa_new(&opts->u.rsa, type, key, keylen, errp); + + default: + error_setg(errp, "Unsupported algorithm: %u", opts->algorithm); + return NULL; + } + + return NULL; +} + +static void qcrypto_nettle_rsa_set_akcipher_size(QCryptoAkCipher *akcipher, + int key_size) +{ + akcipher->max_plaintext_len = key_size; + akcipher->max_ciphertext_len = key_size; + akcipher->max_signature_len = key_size; + akcipher->max_dgst_len = key_size; +} + +static int qcrypt_nettle_parse_rsa_private_key(QCryptoNettleRSA *rsa, + const uint8_t *key, + size_t keylen) +{ + QCryptoAkCipherRSAKey *rsa_key = + qcrypto_akcipher_parse_rsa_private_key(key, keylen); + int ret = -1; + if (!rsa_key) { + return ret; + } + + nettle_mpz_init_set_str_256_u(rsa->pub.n, rsa_key->n.len, rsa_key->n.data); + nettle_mpz_init_set_str_256_u(rsa->pub.e, rsa_key->e.len, rsa_key->e.data); + nettle_mpz_init_set_str_256_u(rsa->priv.d, rsa_key->d.len, rsa_key->d.data); + nettle_mpz_init_set_str_256_u(rsa->priv.p, rsa_key->p.len, rsa_key->p.data); + nettle_mpz_init_set_str_256_u(rsa->priv.q, rsa_key->q.len, rsa_key->q.data); + nettle_mpz_init_set_str_256_u(rsa->priv.a, rsa_key->dp.len, + rsa_key->dp.data); + nettle_mpz_init_set_str_256_u(rsa->priv.b, rsa_key->dq.len, + rsa_key->dq.data); + nettle_mpz_init_set_str_256_u(rsa->priv.c, rsa_key->u.len, rsa_key->u.data); + + if (!rsa_public_key_prepare(&rsa->pub)) { + goto clear; + } + + /** + * Since in the kernel's unit test, the p, q, a, b, c of some + * private keys is 0, only the simplest length check is done here + */ + if (rsa_key->p.len > 1 && + rsa_key->q.len > 1 && + rsa_key->dp.len > 1 && + rsa_key->dq.len > 1 && + rsa_key->u.len > 1) { + if (!rsa_private_key_prepare(&rsa->priv)) { + goto clear; + } + } else { + rsa->priv.size = rsa->pub.size; + } + qcrypto_nettle_rsa_set_akcipher_size( + (QCryptoAkCipher *)rsa, rsa->priv.size); + ret = 0; + +clear: + qcrypto_akcipher_free_rsa_key(rsa_key); + return ret; +} + +static int qcrypt_nettle_parse_rsa_public_key(QCryptoNettleRSA *rsa, + const uint8_t *key, + size_t keylen) +{ + QCryptoAkCipherRSAKey *rsa_key = + qcrypto_akcipher_parse_rsa_public_key(key, keylen); + int ret = -1; + if (!rsa_key) { + return ret; + } + nettle_mpz_init_set_str_256_u(rsa->pub.n, rsa_key->n.len, rsa_key->n.data); + nettle_mpz_init_set_str_256_u(rsa->pub.e, rsa_key->e.len, rsa_key->e.data); + + if (!rsa_public_key_prepare(&rsa->pub)) { + goto clear; + } + qcrypto_nettle_rsa_set_akcipher_size( + (QCryptoAkCipher *)rsa, rsa->pub.size); + ret = 0; + +clear: + qcrypto_akcipher_free_rsa_key(rsa_key); + return ret; +} + +static void wrap_nettle_random_func(void *ctx, size_t len, uint8_t *out) +{ + /* TODO: check result */ + qcrypto_random_bytes(out, len, NULL); +} + +static int qcrypto_nettle_rsa_encrypt(QCryptoAkCipher *akcipher_driver, + const void *data, size_t data_len, + void *enc, size_t enc_len, + Error **errp) +{ + + QCryptoNettleRSA *rsa = + container_of(akcipher_driver, QCryptoNettleRSA, akcipher); + mpz_t c; + int ret = -1; + + if (data_len > rsa->pub.size || enc_len != rsa->pub.size) { + error_setg(errp, "Invalid buffer size"); + return ret; + } + + /* Nettle do not support RSA encryption without any padding */ + switch (rsa->padding_alg) { + case QCRYPTO_RSA_PADDING_ALG_RAW: + error_setg(errp, "RSA with raw padding is not supported"); + break; + + case QCRYPTO_RSA_PADDING_ALG_PKCS1: + mpz_init(c); + if (rsa_encrypt(&rsa->pub, NULL, wrap_nettle_random_func, + data_len, (uint8_t *)data, c) != 1) { + error_setg(errp, "Failed to encrypt"); + } else { + nettle_mpz_get_str_256(enc_len, (uint8_t *)enc, c); + ret = enc_len; + } + mpz_clear(c); + break; + + default: + error_setg(errp, "Unknown padding"); + } + + return ret; +} + +static int qcrypto_nettle_rsa_decrypt(QCryptoAkCipher *akcipher, + const void *enc, size_t enc_len, + void *data, size_t data_len, + Error **errp) +{ + QCryptoNettleRSA *rsa = container_of(akcipher, QCryptoNettleRSA, akcipher); + mpz_t c; + int ret = -1; + if (enc_len > rsa->priv.size) { + error_setg(errp, "Invalid buffer size"); + return ret; + } + + switch (rsa->padding_alg) { + case QCRYPTO_RSA_PADDING_ALG_RAW: + error_setg(errp, "RSA with raw padding is not supported"); + break; + + case QCRYPTO_RSA_PADDING_ALG_PKCS1: + nettle_mpz_init_set_str_256_u(c, enc_len, enc); + if (!rsa_decrypt(&rsa->priv, &data_len, (uint8_t *)data, c)) { + error_setg(errp, "Failed to decrypt"); + } else { + ret = data_len; + } + + mpz_clear(c); + break; + + default: + ret = -1; + error_setg(errp, "Unknown padding"); + } + + return ret; +} + +static int qcrypto_nettle_rsa_sign(QCryptoAkCipher *akcipher, + const void *data, size_t data_len, + void *sig, size_t sig_len, Error **errp) +{ + QCryptoNettleRSA *rsa = container_of(akcipher, QCryptoNettleRSA, akcipher); + int ret; + mpz_t s; + + /** + * The RSA algorithm cannot be used for signature/verification + * without padding. + */ + if (rsa->padding_alg == QCRYPTO_RSA_PADDING_ALG_RAW) { + error_setg(errp, "Try to make signature without padding"); + return -1; + } + + if (data_len > rsa->priv.size || sig_len != rsa->priv.size) { + error_setg(errp, "Invalid buffer size"); + return -1; + } + + mpz_init(s); + switch (rsa->hash_alg) { + case QCRYPTO_HASH_ALG_MD5: + ret = rsa_md5_sign_digest(&rsa->priv, data, s); + break; + + case QCRYPTO_HASH_ALG_SHA1: + ret = rsa_sha1_sign_digest(&rsa->priv, data, s); + break; + + case QCRYPTO_HASH_ALG_SHA256: + ret = rsa_sha256_sign_digest(&rsa->priv, data, s); + break; + + case QCRYPTO_HASH_ALG_SHA512: + ret = rsa_sha512_sign_digest(&rsa->priv, data, s); + break; + + default: + error_setg(errp, "Unknown hash algorithm"); + ret = -1; + goto clear; + } + + if (ret != 1) { + error_setg(errp, "Failed to make signature"); + ret = -1; + goto clear; + } + nettle_mpz_get_str_256(sig_len, (uint8_t *)sig, s); + ret = sig_len; + +clear: + mpz_clear(s); + + return ret; +} + +static int qcrypto_nettle_rsa_verify(QCryptoAkCipher *akcipher, + const void *sig, size_t sig_len, + const void *data, size_t data_len, + Error **errp) +{ + QCryptoNettleRSA *rsa = container_of(akcipher, QCryptoNettleRSA, akcipher); + + int ret; + mpz_t s; + + /** + * The RSA algorithm cannot be used for signature/verification + * without padding. + */ + if (rsa->padding_alg == QCRYPTO_RSA_PADDING_ALG_RAW) { + error_setg(errp, "Operation not supported"); + return -1; + } + if (data_len > rsa->pub.size || sig_len < rsa->pub.size) { + error_setg(errp, "Invalid buffer size"); + return -1; + } + + nettle_mpz_init_set_str_256_u(s, sig_len, sig); + switch (rsa->hash_alg) { + case QCRYPTO_HASH_ALG_MD5: + ret = rsa_md5_verify_digest(&rsa->pub, data, s); + break; + + case QCRYPTO_HASH_ALG_SHA1: + ret = rsa_sha1_verify_digest(&rsa->pub, data, s); + break; + + case QCRYPTO_HASH_ALG_SHA256: + ret = rsa_sha256_verify_digest(&rsa->pub, data, s); + break; + + case QCRYPTO_HASH_ALG_SHA512: + ret = rsa_sha512_verify_digest(&rsa->pub, data, s); + break; + + default: + error_setg(errp, "Unsupported hash algorithm"); + ret = -1; + goto clear; + } + + if (ret != 1) { + error_setg(errp, "Failed to verify"); + ret = -1; + goto clear; + } + ret = 0; + +clear: + mpz_clear(s); + + return ret; +} + +static int qcrypto_nettle_rsa_free(QCryptoAkCipher *akcipher, + Error **errp) +{ + qcrypto_nettle_rsa_destroy(akcipher); + return 0; +} + +QCryptoAkCipherDriver nettle_rsa = { + .encrypt = qcrypto_nettle_rsa_encrypt, + .decrypt = qcrypto_nettle_rsa_decrypt, + .sign = qcrypto_nettle_rsa_sign, + .verify = qcrypto_nettle_rsa_verify, + .free = qcrypto_nettle_rsa_free, +}; + +static QCryptoAkCipher *qcrypto_nettle_rsa_new( + const QCryptoAkCipherOptionsRSA *opt, + QCryptoAkCipherKeyType type, + const uint8_t *key, size_t keylen, + Error **errp) +{ + QCryptoNettleRSA *rsa = g_new0(QCryptoNettleRSA, 1); + + rsa->padding_alg = opt->padding_alg; + rsa->hash_alg = opt->hash_alg; + rsa->akcipher.driver = &nettle_rsa; + rsa_public_key_init(&rsa->pub); + rsa_private_key_init(&rsa->priv); + + switch (type) { + case QCRYPTO_AKCIPHER_KEY_TYPE_PRIVATE: + if (qcrypt_nettle_parse_rsa_private_key(rsa, key, keylen) != 0) { + error_setg(errp, "Failed to parse rsa private key"); + goto err; + } + break; + + case QCRYPTO_AKCIPHER_KEY_TYPE_PUBLIC: + if (qcrypt_nettle_parse_rsa_public_key(rsa, key, keylen) != 0) { + error_setg(errp, "Failed to parse rsa public rsa key"); + goto err; + } + break; + + default: + error_setg(errp, "Unknown akcipher key type %d", type); + } + + return (QCryptoAkCipher *)rsa; + +err: + qcrypto_nettle_rsa_destroy(rsa); + return NULL; +} + + +bool qcrypto_akcipher_supports(QCryptoAkCipherOptions *opts) +{ + switch (opts->algorithm) { + case QCRYPTO_AKCIPHER_ALG_RSA: + switch (opts->u.rsa.padding_alg) { + case QCRYPTO_RSA_PADDING_ALG_PKCS1: + switch (opts->u.rsa.hash_alg) { + case QCRYPTO_HASH_ALG_MD5: + case QCRYPTO_HASH_ALG_SHA1: + case QCRYPTO_HASH_ALG_SHA256: + case QCRYPTO_HASH_ALG_SHA512: + return true; + + default: + return false; + } + + case QCRYPTO_RSA_PADDING_ALG_RAW: + default: + return false; + } + break; + + default: + return false; + } +} diff --git a/crypto/akcipher.c b/crypto/akcipher.c index 7323a48073..dc29127bb4 100644 --- a/crypto/akcipher.c +++ b/crypto/akcipher.c @@ -23,6 +23,9 @@ #include "crypto/akcipher.h" #include "akcipherpriv.h" +#if defined(CONFIG_NETTLE) && defined(CONFIG_HOGWEED) +#include "akcipher-nettle.c.inc" +#else QCryptoAkCipher *qcrypto_akcipher_new(const QCryptoAkCipherOptions *opts, QCryptoAkCipherKeyType type, const uint8_t *key, size_t keylen, @@ -37,6 +40,7 @@ bool qcrypto_akcipher_supports(QCryptoAkCipherOptions *opts) { return false; } +#endif int qcrypto_akcipher_encrypt(QCryptoAkCipher *akcipher, const void *in, size_t in_len, diff --git a/crypto/meson.build b/crypto/meson.build index 57f29d6f74..43a90ef211 100644 --- a/crypto/meson.build +++ b/crypto/meson.build @@ -21,10 +21,14 @@ crypto_ss.add(files( 'tlscredspsk.c', 'tlscredsx509.c', 'tlssession.c', + 'rsakey.c', )) if nettle.found() crypto_ss.add(nettle, files('hash-nettle.c', 'hmac-nettle.c', 'pbkdf-nettle.c')) + if hogweed.found() + crypto_ss.add(gmp, hogweed) + endif if xts == 'private' crypto_ss.add(files('xts.c')) endif diff --git a/crypto/rsakey-builtin.c.inc b/crypto/rsakey-builtin.c.inc new file mode 100644 index 0000000000..d9cdae9e4b --- /dev/null +++ b/crypto/rsakey-builtin.c.inc @@ -0,0 +1,150 @@ +/* + * QEMU Crypto akcipher algorithms + * + * Copyright (c) 2022 Bytedance + * Author: lei he <helei.si...@bytedance.com> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + * + */ + +#include "rsakey.h" +#include "asn1_decoder.h" + +static int extract_mpi(void *ctx, const uint8_t *value, size_t vlen) +{ + QCryptoAkCipherMpi *mpi = (QCryptoAkCipherMpi *)ctx; + mpi->data = g_memdup2(value, vlen); + mpi->len = vlen; + return 0; +} + +static int extract_version(void *ctx, const uint8_t *value, size_t vlen) +{ + uint8_t *version = (uint8_t *)ctx; + if (vlen != 1) { + return -1; + } + if (*value > 1) { + return -1; + } + *version = *value; + return 0; +} + +static int extract_content(void *ctx, const uint8_t *value, size_t vlen) +{ + const uint8_t **content = (const uint8_t **)ctx; + *content = value; + return 0; +} + +/** + * + * RsaPubKey ::= SEQUENCE { + * n INTEGER + * e INTEGER + * } + */ +QCryptoAkCipherRSAKey *qcrypto_akcipher_parse_rsa_public_key(const uint8_t *key, + size_t keylen) +{ + QCryptoAkCipherRSAKey *rsa = g_new0(QCryptoAkCipherRSAKey, 1); + const uint8_t *seq; + size_t seq_length; + int decode_ret; + + decode_ret = der_decode_seq(&key, &keylen, extract_content, &seq); + if (decode_ret <= 0 || keylen != 0) { + goto err; + } + seq_length = decode_ret; + + if (der_decode_int(&seq, &seq_length, extract_mpi, &rsa->n) <= 0 || + der_decode_int(&seq, &seq_length, extract_mpi, &rsa->e) <= 0 || + seq_length != 0) { + goto err; + } + + return rsa; + +err: + qcrypto_akcipher_free_rsa_key(rsa); + return NULL; +} + +/** + * RsaPrivKey ::= SEQUENCE { + * version INTEGER + * n INTEGER + * e INTEGER + * d INTEGER + * p INTEGER + * q INTEGER + * dp INTEGER + * dq INTEGER + * u INTEGER + * otherPrimeInfos OtherPrimeInfos OPTIONAL + * } + */ +QCryptoAkCipherRSAKey *qcrypto_akcipher_parse_rsa_private_key( + const uint8_t *key, size_t keylen) +{ + QCryptoAkCipherRSAKey *rsa = g_new0(QCryptoAkCipherRSAKey, 1); + uint8_t version; + const uint8_t *seq; + int decode_ret; + size_t seq_length; + + decode_ret = der_decode_seq(&key, &keylen, extract_content, &seq); + if (decode_ret <= 0 || keylen != 0) { + goto err; + } + seq_length = decode_ret; + + if (der_decode_int(&seq, &seq_length, + extract_version, &version) != sizeof(version) || + version > 1) { + goto err; + } + if (der_decode_int(&seq, &seq_length, extract_mpi, &rsa->n) <= 0 || + der_decode_int(&seq, &seq_length, extract_mpi, &rsa->e) <= 0 || + der_decode_int(&seq, &seq_length, extract_mpi, &rsa->d) <= 0 || + der_decode_int(&seq, &seq_length, extract_mpi, &rsa->p) <= 0 || + der_decode_int(&seq, &seq_length, extract_mpi, &rsa->q) <= 0 || + der_decode_int(&seq, &seq_length, extract_mpi, &rsa->dp) <= 0 || + der_decode_int(&seq, &seq_length, extract_mpi, &rsa->dq) <= 0 || + der_decode_int(&seq, &seq_length, extract_mpi, &rsa->u) <= 0) { + goto err; + } + /** + * According to the standard, otherPrimeInfos must be present for version 1. + * There is no strict verification here, this is to be compatible with + * the unit test of the kernel. TODO: remove this until linux kernel's + * unit-test is fixed. + */ + if (version == 1 && seq_length != 0) { + if (der_decode_seq(&seq, &seq_length, NULL, NULL) <= 0) { + goto err; + } + } + if (seq_length != 0) { + goto err; + } + return rsa; + +err: + qcrypto_akcipher_free_rsa_key(rsa); + return NULL; +} diff --git a/crypto/rsakey-nettle.c.inc b/crypto/rsakey-nettle.c.inc new file mode 100644 index 0000000000..3516eba69f --- /dev/null +++ b/crypto/rsakey-nettle.c.inc @@ -0,0 +1,141 @@ +/* + * QEMU Crypto akcipher algorithms + * + * Copyright (c) 2022 Bytedance + * Author: lei he <helei.si...@bytedance.com> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + * + */ + +#include <nettle/asn1.h> +#include <stdbool.h> + +#include "rsakey.h" + +static bool DumpMpi(struct asn1_der_iterator *i, QCryptoAkCipherMpi *mpi) +{ + mpi->data = g_memdup2(i->data, i->length); + mpi->len = i->length; + return true; +} + +static bool GetMpi(struct asn1_der_iterator *i, QCryptoAkCipherMpi *mpi) +{ + if (asn1_der_iterator_next(i) != ASN1_ITERATOR_PRIMITIVE || + i->type != ASN1_INTEGER) { + return false; + } + return DumpMpi(i, mpi); +} + + +/** + * RsaPrivKey ::= SEQUENCE { + * version INTEGER + * n INTEGER + * e INTEGER + * d INTEGER + * p INTEGER + * q INTEGER + * dp INTEGER + * dq INTEGER + * u INTEGER + * otherPrimeInfos OtherPrimeInfos OPTIONAL + * } + */ +QCryptoAkCipherRSAKey *qcrypto_akcipher_parse_rsa_private_key( + const uint8_t *key, size_t keylen) +{ + QCryptoAkCipherRSAKey *rsa = g_new0(QCryptoAkCipherRSAKey, 1); + struct asn1_der_iterator i; + uint32_t version; + int tag; + + /* Parse entire struct */ + if (asn1_der_iterator_first(&i, keylen, key) != ASN1_ITERATOR_CONSTRUCTED + || i.type != ASN1_SEQUENCE + || asn1_der_decode_constructed_last(&i) != ASN1_ITERATOR_PRIMITIVE + || i.type != ASN1_INTEGER + || !asn1_der_get_uint32(&i, &version) + || version > 1 + || !GetMpi(&i, &rsa->n) + || !GetMpi(&i, &rsa->e) + || !GetMpi(&i, &rsa->d) + || !GetMpi(&i, &rsa->p) + || !GetMpi(&i, &rsa->q) + || !GetMpi(&i, &rsa->dp) + || !GetMpi(&i, &rsa->dq) + || !GetMpi(&i, &rsa->u)) { + goto err; + } + + if (version == 1) { + tag = asn1_der_iterator_next(&i); + /** + * According to the standard otherPrimeInfos must be present for + * version 1. There is no strict verification here, this is to be + * compatible with the unit test of the kernel. TODO: remove this + * until linux-kernel's unit-test is fixed; + */ + if (tag == ASN1_ITERATOR_END) { + return rsa; + } + if (tag != ASN1_ITERATOR_CONSTRUCTED || + i.type != ASN1_SEQUENCE) { + goto err; + } + } + + if (asn1_der_iterator_next(&i) != ASN1_ITERATOR_END) { + goto err; + } + + return rsa; + + /* fallthrough to err */ +err: + qcrypto_akcipher_free_rsa_key(rsa); + return NULL; +} + +/** + * + * RsaPubKey ::= SEQUENCE { + * n INTEGER + * e INTEGER + * } + */ +QCryptoAkCipherRSAKey *qcrypto_akcipher_parse_rsa_public_key( + const uint8_t *key, size_t keylen) +{ + + QCryptoAkCipherRSAKey *rsa = g_new0(QCryptoAkCipherRSAKey, 1); + struct asn1_der_iterator i; + + if (asn1_der_iterator_first(&i, keylen, key) != ASN1_ITERATOR_CONSTRUCTED + || i.type != ASN1_SEQUENCE + || asn1_der_decode_constructed_last(&i) != ASN1_ITERATOR_PRIMITIVE + || !DumpMpi(&i, &rsa->n) + || !GetMpi(&i, &rsa->e) + || asn1_der_iterator_next(&i) != ASN1_ITERATOR_END) { + goto err; + } + + return rsa; + +err: + qcrypto_akcipher_free_rsa_key(rsa); + return NULL; +} diff --git a/crypto/rsakey.c b/crypto/rsakey.c new file mode 100644 index 0000000000..24704f6b9e --- /dev/null +++ b/crypto/rsakey.c @@ -0,0 +1,43 @@ +/* + * QEMU Crypto RSA key parser + * + * Copyright (c) 2022 Bytedance + * Author: lei he <helei.si...@bytedance.com> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + * + */ + +#include "rsakey.h" + +void qcrypto_akcipher_free_rsa_key(QCryptoAkCipherRSAKey *rsa_key) +{ + if (!rsa_key) { + return; + } + g_free(rsa_key->n.data); + g_free(rsa_key->e.data); + g_free(rsa_key->d.data); + g_free(rsa_key->p.data); + g_free(rsa_key->q.data); + g_free(rsa_key->dp.data); + g_free(rsa_key->dq.data); + g_free(rsa_key->u.data); +} + +#if defined(CONFIG_NETTLE) && defined(CONFIG_HOGWEED) +#include "rsakey-nettle.c.inc" +#else +#include "rsakey-builtin.c.inc" +#endif diff --git a/crypto/rsakey.h b/crypto/rsakey.h new file mode 100644 index 0000000000..6345b2222f --- /dev/null +++ b/crypto/rsakey.h @@ -0,0 +1,96 @@ +/* + * QEMU Crypto RSA key parser + * + * Copyright (c) 2022 Bytedance + * Author: lei he <helei.si...@bytedance.com> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + * + */ + +#ifndef QCRYPTO_RSAKEY_H +#define QCRYPTO_RSAKEY_H + +#include <nettle/bignum.h> + +#include "qemu/osdep.h" +#include "qemu/host-utils.h" +#include "crypto/akcipher.h" + +typedef struct QCryptoAkCipherRSAKey QCryptoAkCipherRSAKey; +typedef struct QCryptoAkCipherMpi QCryptoAkCipherMpi; + +/** + * Multiple precious integer, encoded as two' complement, + * copied directly from DER encoded ASN.1 structures. + */ +struct QCryptoAkCipherMpi { + uint8_t *data; + size_t len; +}; + +/* See rfc2437: https://datatracker.ietf.org/doc/html/rfc2437 */ +struct QCryptoAkCipherRSAKey { + /* The modulus */ + QCryptoAkCipherMpi n; + /* The public exponent */ + QCryptoAkCipherMpi e; + /* The private exponent */ + QCryptoAkCipherMpi d; + /* The first factor */ + QCryptoAkCipherMpi p; + /* The second factor */ + QCryptoAkCipherMpi q; + /* The first factor's exponent */ + QCryptoAkCipherMpi dp; + /* The second factor's exponent */ + QCryptoAkCipherMpi dq; + /* The CRT coefficient */ + QCryptoAkCipherMpi u; +}; + +/** + * Parse DER encoded ASN.1 RSA private key, expected ASN.1 schema: + * RsaPrivKey ::= SEQUENCE { + * version INTEGER + * n INTEGER + * e INTEGER + * d INTEGER + * p INTEGER + * q INTEGER + * dp INTEGER + * dq INTEGER + * u INTEGER + * } + * + * Return: On success QCryptoAkCipherRSAKey is returned, otherwise returns NULL + */ +QCryptoAkCipherRSAKey *qcrypto_akcipher_parse_rsa_private_key( + const uint8_t *key, size_t keylen); + +/** + * Parse DER encoded ASN.1 RSA public key, expected ASN.1 schema: + * RsaPubKey ::= SEQUENCE { + * n INTEGER + * e INTEGER + * } + * + * Return: On success QCryptoAkCipherRSAKey is returned, otherwise returns NULL + */ +QCryptoAkCipherRSAKey *qcrypto_akcipher_parse_rsa_public_key( + const uint8_t *key, size_t keylen); + +void qcrypto_akcipher_free_rsa_key(QCryptoAkCipherRSAKey *key); + +#endif diff --git a/meson.build b/meson.build index aef724ad3c..c1724eb33f 100644 --- a/meson.build +++ b/meson.build @@ -1049,6 +1049,7 @@ endif # gcrypt over nettle for performance reasons. gcrypt = not_found nettle = not_found +hogweed = not_found xts = 'none' if get_option('nettle').enabled() and get_option('gcrypt').enabled() @@ -1086,6 +1087,15 @@ if not gnutls_crypto.found() endif endif +gmp = dependency('gmp', required: false, method: 'pkg-config', kwargs: static_kwargs) +if nettle.found() and gmp.found() + hogweed = dependency('hogweed', version: '>=3.4', + method: 'pkg-config', + required: get_option('nettle'), + kwargs: static_kwargs) +endif + + gtk = not_found gtkx11 = not_found vte = not_found @@ -1567,6 +1577,7 @@ config_host_data.set('CONFIG_GNUTLS', gnutls.found()) config_host_data.set('CONFIG_GNUTLS_CRYPTO', gnutls_crypto.found()) config_host_data.set('CONFIG_GCRYPT', gcrypt.found()) config_host_data.set('CONFIG_NETTLE', nettle.found()) +config_host_data.set('CONFIG_HOGWEED', hogweed.found()) config_host_data.set('CONFIG_QEMU_PRIVATE_XTS', xts == 'private') config_host_data.set('CONFIG_MALLOC_TRIM', has_malloc_trim) config_host_data.set('CONFIG_STATX', has_statx) -- 2.20.1
