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boringssl/ssl/ssl_privkey.cc
David Benjamin 791b390017 Add EVP_PKEY_get_ec_curve_nid and EVP_PKEY_get_ec_point_conv_form 
EVP_PKEY_get_ec_point_conv_form comes from OpenSSL 3.x.
EVP_PKEY_get_ec_curve_nid is new because OpenSSL 3.x instead has a
string-based API.

Still a ways to go, but let's start making EVP_PKEYs more useful, so
folks don't have to dip into a parallel universe of "low-level" APIs
as much.

Bug: 42290405
Change-Id: Ide3fad08194d833a3f011116fcfb0365540e4fad
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/80009
Commit-Queue: Adam Langley <agl@google.com>
Auto-Submit: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>
2025-06-30 15:51:02 -07:00

905 lines
29 KiB
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// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <openssl/ssl.h>
#include <assert.h>
#include <limits.h>
#include <algorithm>
#include <openssl/ec.h>
#include <openssl/ec_key.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/mem.h>
#include <openssl/span.h>
#include "../crypto/internal.h"
#include "internal.h"
BSSL_NAMESPACE_BEGIN
bool ssl_is_key_type_supported(int key_type) {
return key_type == EVP_PKEY_RSA || key_type == EVP_PKEY_EC ||
key_type == EVP_PKEY_ED25519;
}
typedef struct {
uint16_t sigalg;
int pkey_type;
int curve;
const EVP_MD *(*digest_func)(void);
bool is_rsa_pss;
bool tls12_ok;
bool tls13_ok;
bool client_only;
} SSL_SIGNATURE_ALGORITHM;
static const SSL_SIGNATURE_ALGORITHM kSignatureAlgorithms[] = {
// PKCS#1 v1.5 code points are only allowed in TLS 1.2.
{SSL_SIGN_RSA_PKCS1_MD5_SHA1, EVP_PKEY_RSA, NID_undef, &EVP_md5_sha1,
/*is_rsa_pss=*/false, /*tls12_ok=*/true, /*tls13_ok=*/false,
/*client_only=*/false},
{SSL_SIGN_RSA_PKCS1_SHA1, EVP_PKEY_RSA, NID_undef, &EVP_sha1,
/*is_rsa_pss=*/false, /*tls12_ok=*/true, /*tls13_ok=*/false,
/*client_only=*/false},
{SSL_SIGN_RSA_PKCS1_SHA256, EVP_PKEY_RSA, NID_undef, &EVP_sha256,
/*is_rsa_pss=*/false, /*tls12_ok=*/true, /*tls13_ok=*/false,
/*client_only=*/false},
{SSL_SIGN_RSA_PKCS1_SHA384, EVP_PKEY_RSA, NID_undef, &EVP_sha384,
/*is_rsa_pss=*/false, /*tls12_ok=*/true, /*tls13_ok=*/false,
/*client_only=*/false},
{SSL_SIGN_RSA_PKCS1_SHA512, EVP_PKEY_RSA, NID_undef, &EVP_sha512,
/*is_rsa_pss=*/false, /*tls12_ok=*/true, /*tls13_ok=*/false,
/*client_only=*/false},
// Legacy PKCS#1 v1.5 code points are only allowed in TLS 1.3 and
// client-only. See draft-ietf-tls-tls13-pkcs1-00.
{SSL_SIGN_RSA_PKCS1_SHA256_LEGACY, EVP_PKEY_RSA, NID_undef, &EVP_sha256,
/*is_rsa_pss=*/false, /*tls12_ok=*/false, /*tls13_ok=*/true,
/*client_only=*/true},
{SSL_SIGN_RSA_PSS_RSAE_SHA256, EVP_PKEY_RSA, NID_undef, &EVP_sha256,
/*is_rsa_pss=*/true, /*tls12_ok=*/true, /*tls13_ok=*/true,
/*client_only=*/false},
{SSL_SIGN_RSA_PSS_RSAE_SHA384, EVP_PKEY_RSA, NID_undef, &EVP_sha384,
/*is_rsa_pss=*/true, /*tls12_ok=*/true, /*tls13_ok=*/true,
/*client_only=*/false},
{SSL_SIGN_RSA_PSS_RSAE_SHA512, EVP_PKEY_RSA, NID_undef, &EVP_sha512,
/*is_rsa_pss=*/true, /*tls12_ok=*/true, /*tls13_ok=*/true,
/*client_only=*/false},
{SSL_SIGN_ECDSA_SHA1, EVP_PKEY_EC, NID_undef, &EVP_sha1,
/*is_rsa_pss=*/false, /*tls12_ok=*/true, /*tls13_ok=*/false,
/*client_only=*/false},
{SSL_SIGN_ECDSA_SECP256R1_SHA256, EVP_PKEY_EC, NID_X9_62_prime256v1,
&EVP_sha256, /*is_rsa_pss=*/false, /*tls12_ok=*/true, /*tls13_ok=*/true,
/*client_only=*/false},
{SSL_SIGN_ECDSA_SECP384R1_SHA384, EVP_PKEY_EC, NID_secp384r1, &EVP_sha384,
/*is_rsa_pss=*/false, /*tls12_ok=*/true, /*tls13_ok=*/true,
/*client_only=*/false},
{SSL_SIGN_ECDSA_SECP521R1_SHA512, EVP_PKEY_EC, NID_secp521r1, &EVP_sha512,
/*is_rsa_pss=*/false, /*tls12_ok=*/true, /*tls13_ok=*/true,
/*client_only=*/false},
{SSL_SIGN_ED25519, EVP_PKEY_ED25519, NID_undef, nullptr,
/*is_rsa_pss=*/false, /*tls12_ok=*/true, /*tls13_ok=*/true,
/*client_only=*/false},
};
static const SSL_SIGNATURE_ALGORITHM *get_signature_algorithm(uint16_t sigalg) {
for (size_t i = 0; i < OPENSSL_ARRAY_SIZE(kSignatureAlgorithms); i++) {
if (kSignatureAlgorithms[i].sigalg == sigalg) {
return &kSignatureAlgorithms[i];
}
}
return NULL;
}
bool ssl_pkey_supports_algorithm(const SSL *ssl, EVP_PKEY *pkey,
uint16_t sigalg, bool is_verify) {
const SSL_SIGNATURE_ALGORITHM *alg = get_signature_algorithm(sigalg);
if (alg == NULL || EVP_PKEY_id(pkey) != alg->pkey_type) {
return false;
}
// Ensure the RSA key is large enough for the hash. RSASSA-PSS requires that
// emLen be at least hLen + sLen + 2. Both hLen and sLen are the size of the
// hash in TLS. Reasonable RSA key sizes are large enough for the largest
// defined RSASSA-PSS algorithm, but 1024-bit RSA is slightly too small for
// SHA-512. 1024-bit RSA is sometimes used for test credentials, so check the
// size so that we can fall back to another algorithm in that case.
if (alg->is_rsa_pss &&
(size_t)EVP_PKEY_size(pkey) < 2 * EVP_MD_size(alg->digest_func()) + 2) {
return false;
}
if (ssl_protocol_version(ssl) < TLS1_2_VERSION) {
// TLS 1.0 and 1.1 do not negotiate algorithms and always sign one of two
// hardcoded algorithms.
return sigalg == SSL_SIGN_RSA_PKCS1_MD5_SHA1 ||
sigalg == SSL_SIGN_ECDSA_SHA1;
}
// |SSL_SIGN_RSA_PKCS1_MD5_SHA1| is not a real SignatureScheme for TLS 1.2 and
// higher. It is an internal value we use to represent TLS 1.0/1.1's MD5/SHA1
// concatenation.
if (sigalg == SSL_SIGN_RSA_PKCS1_MD5_SHA1) {
return false;
}
if (ssl_protocol_version(ssl) >= TLS1_3_VERSION) {
if (!alg->tls13_ok) {
return false;
}
bool is_client_sign = ssl->server == is_verify;
if (alg->client_only && !is_client_sign) {
return false;
}
// EC keys have a curve requirement.
if (alg->pkey_type == EVP_PKEY_EC &&
(alg->curve == NID_undef ||
EVP_PKEY_get_ec_curve_nid(pkey) != alg->curve)) {
return false;
}
} else if (!alg->tls12_ok) {
return false;
}
return true;
}
static bool setup_ctx(SSL *ssl, EVP_MD_CTX *ctx, EVP_PKEY *pkey,
uint16_t sigalg, bool is_verify) {
if (!ssl_pkey_supports_algorithm(ssl, pkey, sigalg, is_verify)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_SIGNATURE_TYPE);
return false;
}
const SSL_SIGNATURE_ALGORITHM *alg = get_signature_algorithm(sigalg);
const EVP_MD *digest = alg->digest_func != NULL ? alg->digest_func() : NULL;
EVP_PKEY_CTX *pctx;
if (is_verify) {
if (!EVP_DigestVerifyInit(ctx, &pctx, digest, NULL, pkey)) {
return false;
}
} else if (!EVP_DigestSignInit(ctx, &pctx, digest, NULL, pkey)) {
return false;
}
if (alg->is_rsa_pss) {
if (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) ||
!EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, RSA_PSS_SALTLEN_DIGEST)) {
return false;
}
}
return true;
}
enum ssl_private_key_result_t ssl_private_key_sign(
SSL_HANDSHAKE *hs, uint8_t *out, size_t *out_len, size_t max_out,
uint16_t sigalg, Span<const uint8_t> in) {
SSL *const ssl = hs->ssl;
const SSL_CREDENTIAL *const cred = hs->credential.get();
SSL_HANDSHAKE_HINTS *const hints = hs->hints.get();
Array<uint8_t> spki;
if (hints) {
ScopedCBB spki_cbb;
if (!CBB_init(spki_cbb.get(), 64) ||
!EVP_marshal_public_key(spki_cbb.get(), cred->pubkey.get()) ||
!CBBFinishArray(spki_cbb.get(), &spki)) {
ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
return ssl_private_key_failure;
}
}
// Replay the signature from handshake hints if available.
if (hints && !hs->hints_requested && //
sigalg == hints->signature_algorithm && //
in == hints->signature_input && //
Span(spki) == hints->signature_spki && //
!hints->signature.empty() && //
hints->signature.size() <= max_out) {
// Signature algorithm and input both match. Reuse the signature from hints.
*out_len = hints->signature.size();
OPENSSL_memcpy(out, hints->signature.data(), hints->signature.size());
return ssl_private_key_success;
}
const SSL_PRIVATE_KEY_METHOD *key_method = cred->key_method;
EVP_PKEY *privkey = cred->privkey.get();
assert(!hs->can_release_private_key);
if (key_method != NULL) {
enum ssl_private_key_result_t ret;
if (hs->pending_private_key_op) {
ret = key_method->complete(ssl, out, out_len, max_out);
} else {
ret = key_method->sign(ssl, out, out_len, max_out, sigalg, in.data(),
in.size());
}
if (ret == ssl_private_key_failure) {
OPENSSL_PUT_ERROR(SSL, SSL_R_PRIVATE_KEY_OPERATION_FAILED);
}
hs->pending_private_key_op = ret == ssl_private_key_retry;
if (ret != ssl_private_key_success) {
return ret;
}
} else {
*out_len = max_out;
ScopedEVP_MD_CTX ctx;
if (!setup_ctx(ssl, ctx.get(), privkey, sigalg, false /* sign */) ||
!EVP_DigestSign(ctx.get(), out, out_len, in.data(), in.size())) {
return ssl_private_key_failure;
}
}
// Save the hint if applicable.
if (hints && hs->hints_requested) {
hints->signature_algorithm = sigalg;
hints->signature_spki = std::move(spki);
if (!hints->signature_input.CopyFrom(in) ||
!hints->signature.CopyFrom(Span(out, *out_len))) {
return ssl_private_key_failure;
}
}
return ssl_private_key_success;
}
bool ssl_public_key_verify(SSL *ssl, Span<const uint8_t> signature,
uint16_t sigalg, EVP_PKEY *pkey,
Span<const uint8_t> in) {
ScopedEVP_MD_CTX ctx;
if (!setup_ctx(ssl, ctx.get(), pkey, sigalg, true /* verify */)) {
return false;
}
bool ok = EVP_DigestVerify(ctx.get(), signature.data(), signature.size(),
in.data(), in.size());
if (CRYPTO_fuzzer_mode_enabled()) {
ok = true;
ERR_clear_error();
}
return ok;
}
enum ssl_private_key_result_t ssl_private_key_decrypt(SSL_HANDSHAKE *hs,
uint8_t *out,
size_t *out_len,
size_t max_out,
Span<const uint8_t> in) {
SSL *const ssl = hs->ssl;
const SSL_CREDENTIAL *const cred = hs->credential.get();
assert(!hs->can_release_private_key);
if (cred->key_method != NULL) {
enum ssl_private_key_result_t ret;
if (hs->pending_private_key_op) {
ret = cred->key_method->complete(ssl, out, out_len, max_out);
} else {
ret = cred->key_method->decrypt(ssl, out, out_len, max_out, in.data(),
in.size());
}
if (ret == ssl_private_key_failure) {
OPENSSL_PUT_ERROR(SSL, SSL_R_PRIVATE_KEY_OPERATION_FAILED);
}
hs->pending_private_key_op = ret == ssl_private_key_retry;
return ret;
}
RSA *rsa = EVP_PKEY_get0_RSA(cred->privkey.get());
if (rsa == NULL) {
// Decrypt operations are only supported for RSA keys.
OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
return ssl_private_key_failure;
}
// Decrypt with no padding. PKCS#1 padding will be removed as part of the
// timing-sensitive code by the caller.
if (!RSA_decrypt(rsa, out_len, out, max_out, in.data(), in.size(),
RSA_NO_PADDING)) {
return ssl_private_key_failure;
}
return ssl_private_key_success;
}
BSSL_NAMESPACE_END
using namespace bssl;
int SSL_use_RSAPrivateKey(SSL *ssl, RSA *rsa) {
if (rsa == NULL || ssl->config == NULL) {
OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
UniquePtr<EVP_PKEY> pkey(EVP_PKEY_new());
if (!pkey || //
!EVP_PKEY_set1_RSA(pkey.get(), rsa)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_EVP_LIB);
return 0;
}
return SSL_use_PrivateKey(ssl, pkey.get());
}
int SSL_use_RSAPrivateKey_ASN1(SSL *ssl, const uint8_t *der, size_t der_len) {
UniquePtr<RSA> rsa(RSA_private_key_from_bytes(der, der_len));
if (!rsa) {
OPENSSL_PUT_ERROR(SSL, ERR_R_ASN1_LIB);
return 0;
}
return SSL_use_RSAPrivateKey(ssl, rsa.get());
}
int SSL_use_PrivateKey(SSL *ssl, EVP_PKEY *pkey) {
if (pkey == NULL || ssl->config == NULL) {
OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
return SSL_CREDENTIAL_set1_private_key(
ssl->config->cert->legacy_credential.get(), pkey);
}
int SSL_use_PrivateKey_ASN1(int type, SSL *ssl, const uint8_t *der,
size_t der_len) {
if (der_len > LONG_MAX) {
OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
return 0;
}
const uint8_t *p = der;
UniquePtr<EVP_PKEY> pkey(d2i_PrivateKey(type, NULL, &p, (long)der_len));
if (!pkey || p != der + der_len) {
OPENSSL_PUT_ERROR(SSL, ERR_R_ASN1_LIB);
return 0;
}
return SSL_use_PrivateKey(ssl, pkey.get());
}
int SSL_CTX_use_RSAPrivateKey(SSL_CTX *ctx, RSA *rsa) {
if (rsa == NULL) {
OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
UniquePtr<EVP_PKEY> pkey(EVP_PKEY_new());
if (!pkey || !EVP_PKEY_set1_RSA(pkey.get(), rsa)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_EVP_LIB);
return 0;
}
return SSL_CTX_use_PrivateKey(ctx, pkey.get());
}
int SSL_CTX_use_RSAPrivateKey_ASN1(SSL_CTX *ctx, const uint8_t *der,
size_t der_len) {
UniquePtr<RSA> rsa(RSA_private_key_from_bytes(der, der_len));
if (!rsa) {
OPENSSL_PUT_ERROR(SSL, ERR_R_ASN1_LIB);
return 0;
}
return SSL_CTX_use_RSAPrivateKey(ctx, rsa.get());
}
int SSL_CTX_use_PrivateKey(SSL_CTX *ctx, EVP_PKEY *pkey) {
if (pkey == NULL) {
OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
return SSL_CREDENTIAL_set1_private_key(ctx->cert->legacy_credential.get(),
pkey);
}
int SSL_CTX_use_PrivateKey_ASN1(int type, SSL_CTX *ctx, const uint8_t *der,
size_t der_len) {
if (der_len > LONG_MAX) {
OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
return 0;
}
const uint8_t *p = der;
UniquePtr<EVP_PKEY> pkey(d2i_PrivateKey(type, NULL, &p, (long)der_len));
if (!pkey || p != der + der_len) {
OPENSSL_PUT_ERROR(SSL, ERR_R_ASN1_LIB);
return 0;
}
return SSL_CTX_use_PrivateKey(ctx, pkey.get());
}
void SSL_set_private_key_method(SSL *ssl,
const SSL_PRIVATE_KEY_METHOD *key_method) {
if (!ssl->config) {
return;
}
BSSL_CHECK(SSL_CREDENTIAL_set_private_key_method(
ssl->config->cert->legacy_credential.get(), key_method));
}
void SSL_CTX_set_private_key_method(SSL_CTX *ctx,
const SSL_PRIVATE_KEY_METHOD *key_method) {
BSSL_CHECK(SSL_CREDENTIAL_set_private_key_method(
ctx->cert->legacy_credential.get(), key_method));
}
static constexpr size_t kMaxSignatureAlgorithmNameLen = 24;
struct SignatureAlgorithmName {
uint16_t signature_algorithm;
const char name[kMaxSignatureAlgorithmNameLen];
};
// This was "constexpr" rather than "const", but that triggered a bug in MSVC
// where it didn't pad the strings to the correct length.
static const SignatureAlgorithmName kSignatureAlgorithmNames[] = {
{SSL_SIGN_RSA_PKCS1_MD5_SHA1, "rsa_pkcs1_md5_sha1"},
{SSL_SIGN_RSA_PKCS1_SHA1, "rsa_pkcs1_sha1"},
{SSL_SIGN_RSA_PKCS1_SHA256, "rsa_pkcs1_sha256"},
{SSL_SIGN_RSA_PKCS1_SHA256_LEGACY, "rsa_pkcs1_sha256_legacy"},
{SSL_SIGN_RSA_PKCS1_SHA384, "rsa_pkcs1_sha384"},
{SSL_SIGN_RSA_PKCS1_SHA512, "rsa_pkcs1_sha512"},
{SSL_SIGN_ECDSA_SHA1, "ecdsa_sha1"},
{SSL_SIGN_ECDSA_SECP256R1_SHA256, "ecdsa_secp256r1_sha256"},
{SSL_SIGN_ECDSA_SECP384R1_SHA384, "ecdsa_secp384r1_sha384"},
{SSL_SIGN_ECDSA_SECP521R1_SHA512, "ecdsa_secp521r1_sha512"},
{SSL_SIGN_RSA_PSS_RSAE_SHA256, "rsa_pss_rsae_sha256"},
{SSL_SIGN_RSA_PSS_RSAE_SHA384, "rsa_pss_rsae_sha384"},
{SSL_SIGN_RSA_PSS_RSAE_SHA512, "rsa_pss_rsae_sha512"},
{SSL_SIGN_ED25519, "ed25519"},
};
const char *SSL_get_signature_algorithm_name(uint16_t sigalg,
int include_curve) {
if (!include_curve) {
switch (sigalg) {
case SSL_SIGN_ECDSA_SECP256R1_SHA256:
return "ecdsa_sha256";
case SSL_SIGN_ECDSA_SECP384R1_SHA384:
return "ecdsa_sha384";
case SSL_SIGN_ECDSA_SECP521R1_SHA512:
return "ecdsa_sha512";
// If adding more here, also update
// |SSL_get_all_signature_algorithm_names|.
}
}
for (const auto &candidate : kSignatureAlgorithmNames) {
if (candidate.signature_algorithm == sigalg) {
return candidate.name;
}
}
return NULL;
}
size_t SSL_get_all_signature_algorithm_names(const char **out, size_t max_out) {
const char *kPredefinedNames[] = {"ecdsa_sha256", "ecdsa_sha384",
"ecdsa_sha512"};
return GetAllNames(out, max_out, kPredefinedNames,
&SignatureAlgorithmName::name,
Span(kSignatureAlgorithmNames));
}
int SSL_get_signature_algorithm_key_type(uint16_t sigalg) {
const SSL_SIGNATURE_ALGORITHM *alg = get_signature_algorithm(sigalg);
return alg != nullptr ? alg->pkey_type : EVP_PKEY_NONE;
}
const EVP_MD *SSL_get_signature_algorithm_digest(uint16_t sigalg) {
const SSL_SIGNATURE_ALGORITHM *alg = get_signature_algorithm(sigalg);
if (alg == nullptr || alg->digest_func == nullptr) {
return nullptr;
}
return alg->digest_func();
}
int SSL_is_signature_algorithm_rsa_pss(uint16_t sigalg) {
const SSL_SIGNATURE_ALGORITHM *alg = get_signature_algorithm(sigalg);
return alg != nullptr && alg->is_rsa_pss;
}
static bool sigalgs_unique(Span<const uint16_t> in_sigalgs) {
if (in_sigalgs.size() < 2) {
return true;
}
Array<uint16_t> sigalgs;
if (!sigalgs.CopyFrom(in_sigalgs)) {
return false;
}
std::sort(sigalgs.begin(), sigalgs.end());
for (size_t i = 1; i < sigalgs.size(); i++) {
if (sigalgs[i - 1] == sigalgs[i]) {
OPENSSL_PUT_ERROR(SSL, SSL_R_DUPLICATE_SIGNATURE_ALGORITHM);
return false;
}
}
return true;
}
static bool set_sigalg_prefs(Array<uint16_t> *out, Span<const uint16_t> prefs) {
if (!sigalgs_unique(prefs)) {
return false;
}
// Check for invalid algorithms, and filter out |SSL_SIGN_RSA_PKCS1_MD5_SHA1|.
Array<uint16_t> filtered;
if (!filtered.InitForOverwrite(prefs.size())) {
return false;
}
size_t added = 0;
for (uint16_t pref : prefs) {
if (pref == SSL_SIGN_RSA_PKCS1_MD5_SHA1) {
// Though not intended to be used with this API, we treat
// |SSL_SIGN_RSA_PKCS1_MD5_SHA1| as a real signature algorithm in
// |SSL_PRIVATE_KEY_METHOD|. Not accepting it here makes for a confusing
// abstraction.
continue;
}
if (get_signature_algorithm(pref) == nullptr) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
return false;
}
filtered[added] = pref;
added++;
}
filtered.Shrink(added);
// This can happen if |prefs| contained only |SSL_SIGN_RSA_PKCS1_MD5_SHA1|.
// Leaving it empty would revert to the default, so treat this as an error
// condition.
if (!prefs.empty() && filtered.empty()) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
return false;
}
*out = std::move(filtered);
return true;
}
int SSL_CREDENTIAL_set1_signing_algorithm_prefs(SSL_CREDENTIAL *cred,
const uint16_t *prefs,
size_t num_prefs) {
if (!cred->UsesPrivateKey()) {
OPENSSL_PUT_ERROR(SSL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return 0;
}
// Delegated credentials are constrained to a single algorithm, so there is no
// need to configure this.
if (cred->type == SSLCredentialType::kDelegated) {
OPENSSL_PUT_ERROR(SSL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return 0;
}
return set_sigalg_prefs(&cred->sigalgs, Span(prefs, num_prefs));
}
int SSL_CTX_set_signing_algorithm_prefs(SSL_CTX *ctx, const uint16_t *prefs,
size_t num_prefs) {
return SSL_CREDENTIAL_set1_signing_algorithm_prefs(
ctx->cert->legacy_credential.get(), prefs, num_prefs);
}
int SSL_set_signing_algorithm_prefs(SSL *ssl, const uint16_t *prefs,
size_t num_prefs) {
if (!ssl->config) {
return 0;
}
return SSL_CREDENTIAL_set1_signing_algorithm_prefs(
ssl->config->cert->legacy_credential.get(), prefs, num_prefs);
}
static constexpr struct {
int pkey_type;
int hash_nid;
uint16_t signature_algorithm;
} kSignatureAlgorithmsMapping[] = {
{EVP_PKEY_RSA, NID_sha1, SSL_SIGN_RSA_PKCS1_SHA1},
{EVP_PKEY_RSA, NID_sha256, SSL_SIGN_RSA_PKCS1_SHA256},
{EVP_PKEY_RSA, NID_sha384, SSL_SIGN_RSA_PKCS1_SHA384},
{EVP_PKEY_RSA, NID_sha512, SSL_SIGN_RSA_PKCS1_SHA512},
{EVP_PKEY_RSA_PSS, NID_sha256, SSL_SIGN_RSA_PSS_RSAE_SHA256},
{EVP_PKEY_RSA_PSS, NID_sha384, SSL_SIGN_RSA_PSS_RSAE_SHA384},
{EVP_PKEY_RSA_PSS, NID_sha512, SSL_SIGN_RSA_PSS_RSAE_SHA512},
{EVP_PKEY_EC, NID_sha1, SSL_SIGN_ECDSA_SHA1},
{EVP_PKEY_EC, NID_sha256, SSL_SIGN_ECDSA_SECP256R1_SHA256},
{EVP_PKEY_EC, NID_sha384, SSL_SIGN_ECDSA_SECP384R1_SHA384},
{EVP_PKEY_EC, NID_sha512, SSL_SIGN_ECDSA_SECP521R1_SHA512},
{EVP_PKEY_ED25519, NID_undef, SSL_SIGN_ED25519},
};
static bool parse_sigalg_pairs(Array<uint16_t> *out, const int *values,
size_t num_values) {
if ((num_values & 1) == 1) {
return false;
}
const size_t num_pairs = num_values / 2;
if (!out->InitForOverwrite(num_pairs)) {
return false;
}
for (size_t i = 0; i < num_values; i += 2) {
const int hash_nid = values[i];
const int pkey_type = values[i + 1];
bool found = false;
for (const auto &candidate : kSignatureAlgorithmsMapping) {
if (candidate.pkey_type == pkey_type && candidate.hash_nid == hash_nid) {
(*out)[i / 2] = candidate.signature_algorithm;
found = true;
break;
}
}
if (!found) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
ERR_add_error_dataf("unknown hash:%d pkey:%d", hash_nid, pkey_type);
return false;
}
}
return true;
}
int SSL_CTX_set1_sigalgs(SSL_CTX *ctx, const int *values, size_t num_values) {
Array<uint16_t> sigalgs;
if (!parse_sigalg_pairs(&sigalgs, values, num_values)) {
return 0;
}
if (!SSL_CTX_set_signing_algorithm_prefs(ctx, sigalgs.data(),
sigalgs.size()) ||
!SSL_CTX_set_verify_algorithm_prefs(ctx, sigalgs.data(),
sigalgs.size())) {
return 0;
}
return 1;
}
int SSL_set1_sigalgs(SSL *ssl, const int *values, size_t num_values) {
if (!ssl->config) {
OPENSSL_PUT_ERROR(SSL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return 0;
}
Array<uint16_t> sigalgs;
if (!parse_sigalg_pairs(&sigalgs, values, num_values)) {
return 0;
}
if (!SSL_set_signing_algorithm_prefs(ssl, sigalgs.data(), sigalgs.size()) ||
!SSL_set_verify_algorithm_prefs(ssl, sigalgs.data(), sigalgs.size())) {
return 0;
}
return 1;
}
static bool parse_sigalgs_list(Array<uint16_t> *out, const char *str) {
// str looks like "RSA+SHA1:ECDSA+SHA256:ecdsa_secp256r1_sha256".
// Count colons to give the number of output elements from any successful
// parse.
size_t num_elements = 1;
size_t len = 0;
for (const char *p = str; *p; p++) {
len++;
if (*p == ':') {
num_elements++;
}
}
if (!out->InitForOverwrite(num_elements)) {
return false;
}
size_t out_i = 0;
enum {
pkey_or_name,
hash_name,
} state = pkey_or_name;
char buf[kMaxSignatureAlgorithmNameLen];
// buf_used is always < sizeof(buf). I.e. it's always safe to write
// buf[buf_used] = 0.
size_t buf_used = 0;
int pkey_type = 0, hash_nid = 0;
// Note that the loop runs to len+1, i.e. it'll process the terminating NUL.
for (size_t offset = 0; offset < len + 1; offset++) {
const unsigned char c = str[offset];
switch (c) {
case '+':
if (state == hash_name) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
ERR_add_error_dataf("+ found in hash name at offset %zu", offset);
return false;
}
if (buf_used == 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
ERR_add_error_dataf("empty public key type at offset %zu", offset);
return false;
}
buf[buf_used] = 0;
if (strcmp(buf, "RSA") == 0) {
pkey_type = EVP_PKEY_RSA;
} else if (strcmp(buf, "RSA-PSS") == 0 || //
strcmp(buf, "PSS") == 0) {
pkey_type = EVP_PKEY_RSA_PSS;
} else if (strcmp(buf, "ECDSA") == 0) {
pkey_type = EVP_PKEY_EC;
} else {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
ERR_add_error_dataf("unknown public key type '%s'", buf);
return false;
}
state = hash_name;
buf_used = 0;
break;
case ':':
[[fallthrough]];
case 0:
if (buf_used == 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
ERR_add_error_dataf("empty element at offset %zu", offset);
return false;
}
buf[buf_used] = 0;
if (state == pkey_or_name) {
// No '+' was seen thus this is a TLS 1.3-style name.
bool found = false;
for (const auto &candidate : kSignatureAlgorithmNames) {
if (strcmp(candidate.name, buf) == 0) {
assert(out_i < num_elements);
(*out)[out_i++] = candidate.signature_algorithm;
found = true;
break;
}
}
if (!found) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
ERR_add_error_dataf("unknown signature algorithm '%s'", buf);
return false;
}
} else {
if (strcmp(buf, "SHA1") == 0) {
hash_nid = NID_sha1;
} else if (strcmp(buf, "SHA256") == 0) {
hash_nid = NID_sha256;
} else if (strcmp(buf, "SHA384") == 0) {
hash_nid = NID_sha384;
} else if (strcmp(buf, "SHA512") == 0) {
hash_nid = NID_sha512;
} else {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
ERR_add_error_dataf("unknown hash function '%s'", buf);
return false;
}
bool found = false;
for (const auto &candidate : kSignatureAlgorithmsMapping) {
if (candidate.pkey_type == pkey_type &&
candidate.hash_nid == hash_nid) {
assert(out_i < num_elements);
(*out)[out_i++] = candidate.signature_algorithm;
found = true;
break;
}
}
if (!found) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
ERR_add_error_dataf("unknown pkey:%d hash:%s", pkey_type, buf);
return false;
}
}
state = pkey_or_name;
buf_used = 0;
break;
default:
if (buf_used == sizeof(buf) - 1) {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
ERR_add_error_dataf("substring too long at offset %zu", offset);
return false;
}
if (OPENSSL_isalnum(c) || c == '-' || c == '_') {
buf[buf_used++] = c;
} else {
OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SIGNATURE_ALGORITHM);
ERR_add_error_dataf("invalid character 0x%02x at offest %zu", c,
offset);
return false;
}
}
}
assert(out_i == out->size());
return true;
}
int SSL_CTX_set1_sigalgs_list(SSL_CTX *ctx, const char *str) {
Array<uint16_t> sigalgs;
if (!parse_sigalgs_list(&sigalgs, str)) {
return 0;
}
if (!SSL_CTX_set_signing_algorithm_prefs(ctx, sigalgs.data(),
sigalgs.size()) ||
!SSL_CTX_set_verify_algorithm_prefs(ctx, sigalgs.data(),
sigalgs.size())) {
return 0;
}
return 1;
}
int SSL_set1_sigalgs_list(SSL *ssl, const char *str) {
if (!ssl->config) {
OPENSSL_PUT_ERROR(SSL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return 0;
}
Array<uint16_t> sigalgs;
if (!parse_sigalgs_list(&sigalgs, str)) {
return 0;
}
if (!SSL_set_signing_algorithm_prefs(ssl, sigalgs.data(), sigalgs.size()) ||
!SSL_set_verify_algorithm_prefs(ssl, sigalgs.data(), sigalgs.size())) {
return 0;
}
return 1;
}
int SSL_CTX_set_verify_algorithm_prefs(SSL_CTX *ctx, const uint16_t *prefs,
size_t num_prefs) {
return set_sigalg_prefs(&ctx->verify_sigalgs, Span(prefs, num_prefs));
}
int SSL_set_verify_algorithm_prefs(SSL *ssl, const uint16_t *prefs,
size_t num_prefs) {
if (!ssl->config) {
OPENSSL_PUT_ERROR(SSL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return 0;
}
return set_sigalg_prefs(&ssl->config->verify_sigalgs, Span(prefs, num_prefs));
}
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