From 4afa7ed562410a1170223a7bc06efb3708af6a36 Mon Sep 17 00:00:00 2001 From: Bernhard Schmidt Date: Sun, 4 Mar 2018 22:55:51 +0100 Subject: New upstream version 2.4.5 --- src/openvpn/cryptoapi.c | 159 ++++++++++++++++++++++++++++++++++++++---------- 1 file changed, 127 insertions(+), 32 deletions(-) (limited to 'src/openvpn/cryptoapi.c') diff --git a/src/openvpn/cryptoapi.c b/src/openvpn/cryptoapi.c index d90cc5d..89d253c 100644 --- a/src/openvpn/cryptoapi.c +++ b/src/openvpn/cryptoapi.c @@ -42,11 +42,13 @@ #include #include #include +#include #include #include #include #include "buffer.h" +#include "openssl_compat.h" /* MinGW w32api 3.17 is still incomplete when it comes to CryptoAPI while * MinGW32-w64 defines all macros used. This is a hack around that problem. @@ -82,6 +84,7 @@ #define CRYPTOAPI_F_CRYPT_SIGN_HASH 106 #define CRYPTOAPI_F_LOAD_LIBRARY 107 #define CRYPTOAPI_F_GET_PROC_ADDRESS 108 +#define CRYPTOAPI_F_NCRYPT_SIGN_HASH 109 static ERR_STRING_DATA CRYPTOAPI_str_functs[] = { { ERR_PACK(ERR_LIB_CRYPTOAPI, 0, 0), "microsoft cryptoapi"}, @@ -94,12 +97,13 @@ static ERR_STRING_DATA CRYPTOAPI_str_functs[] = { { ERR_PACK(0, CRYPTOAPI_F_CRYPT_SIGN_HASH, 0), "CryptSignHash" }, { ERR_PACK(0, CRYPTOAPI_F_LOAD_LIBRARY, 0), "LoadLibrary" }, { ERR_PACK(0, CRYPTOAPI_F_GET_PROC_ADDRESS, 0), "GetProcAddress" }, + { ERR_PACK(0, CRYPTOAPI_F_NCRYPT_SIGN_HASH, 0), "NCryptSignHash" }, { 0, NULL } }; typedef struct _CAPI_DATA { const CERT_CONTEXT *cert_context; - HCRYPTPROV crypt_prov; + HCRYPTPROV_OR_NCRYPT_KEY_HANDLE crypt_prov; DWORD key_spec; BOOL free_crypt_prov; } CAPI_DATA; @@ -209,26 +213,66 @@ rsa_pub_dec(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, in return 0; } +/** + * Sign the hash in 'from' using NCryptSignHash(). This requires an NCRYPT + * key handle in cd->crypt_prov. On return the signature is in 'to'. Returns + * the length of the signature or 0 on error. + * For now we support only RSA and the padding is assumed to be PKCS1 v1.5 + */ +static int +priv_enc_CNG(const CAPI_DATA *cd, const unsigned char *from, int flen, + unsigned char *to, int tlen, int padding) +{ + NCRYPT_KEY_HANDLE hkey = cd->crypt_prov; + DWORD len; + ASSERT(cd->key_spec == CERT_NCRYPT_KEY_SPEC); + + msg(D_LOW, "Signing hash using CNG: data size = %d", flen); + + /* The hash OID is already in 'from'. So set the hash algorithm + * in the padding info struct to NULL. + */ + BCRYPT_PKCS1_PADDING_INFO padinfo = {NULL}; + DWORD status; + + status = NCryptSignHash(hkey, padding? &padinfo : NULL, (BYTE*) from, flen, + to, tlen, &len, padding? BCRYPT_PAD_PKCS1 : 0); + if (status != ERROR_SUCCESS) + { + SetLastError(status); + CRYPTOAPIerr(CRYPTOAPI_F_NCRYPT_SIGN_HASH); + len = 0; + } + + /* Unlike CAPI, CNG signature is in big endian order. No reversing needed. */ + return len; +} + /* sign arbitrary data */ static int rsa_priv_enc(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, int padding) { - CAPI_DATA *cd = (CAPI_DATA *) rsa->meth->app_data; + CAPI_DATA *cd = (CAPI_DATA *) RSA_meth_get0_app_data(RSA_get_method(rsa)); HCRYPTHASH hash; DWORD hash_size, len, i; unsigned char *buf; if (cd == NULL) { - RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_PASSED_NULL_PARAMETER); + RSAerr(RSA_F_RSA_OSSL_PRIVATE_ENCRYPT, ERR_R_PASSED_NULL_PARAMETER); return 0; } if (padding != RSA_PKCS1_PADDING) { /* AFAICS, CryptSignHash() *always* uses PKCS1 padding. */ - RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, RSA_R_UNKNOWN_PADDING_TYPE); + RSAerr(RSA_F_RSA_OSSL_PRIVATE_ENCRYPT, RSA_R_UNKNOWN_PADDING_TYPE); return 0; } + if (cd->key_spec == CERT_NCRYPT_KEY_SPEC) + { + return priv_enc_CNG(cd, from, flen, to, RSA_size(rsa), padding); + } + /* Unfortunately, there is no "CryptSign()" function in CryptoAPI, that would * be way to straightforward for M$, I guess... So we have to do it this * tricky way instead, by creating a "Hash", and load the already-made hash @@ -236,7 +280,7 @@ rsa_priv_enc(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, i /* For now, we only support NID_md5_sha1 */ if (flen != SSL_SIG_LENGTH) { - RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, RSA_R_INVALID_MESSAGE_LENGTH); + RSAerr(RSA_F_RSA_OSSL_PRIVATE_ENCRYPT, RSA_R_INVALID_MESSAGE_LENGTH); return 0; } if (!CryptCreateHash(cd->crypt_prov, CALG_SSL3_SHAMD5, 0, 0, &hash)) @@ -253,7 +297,7 @@ rsa_priv_enc(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, i } if ((int) hash_size != flen) { - RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, RSA_R_INVALID_MESSAGE_LENGTH); + RSAerr(RSA_F_RSA_OSSL_PRIVATE_ENCRYPT, RSA_R_INVALID_MESSAGE_LENGTH); CryptDestroyHash(hash); return 0; } @@ -268,7 +312,7 @@ rsa_priv_enc(int flen, const unsigned char *from, unsigned char *to, RSA *rsa, i buf = malloc(len); if (buf == NULL) { - RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE); + RSAerr(RSA_F_RSA_OSSL_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE); CryptDestroyHash(hash); return 0; } @@ -312,7 +356,8 @@ init(RSA *rsa) static int finish(RSA *rsa) { - CAPI_DATA *cd = (CAPI_DATA *) rsa->meth->app_data; + const RSA_METHOD *rsa_meth = RSA_get_method(rsa); + CAPI_DATA *cd = (CAPI_DATA *) RSA_meth_get0_app_data(rsa_meth); if (cd == NULL) { @@ -320,15 +365,21 @@ finish(RSA *rsa) } if (cd->crypt_prov && cd->free_crypt_prov) { - CryptReleaseContext(cd->crypt_prov, 0); + if (cd->key_spec == CERT_NCRYPT_KEY_SPEC) + { + NCryptFreeObject(cd->crypt_prov); + } + else + { + CryptReleaseContext(cd->crypt_prov, 0); + } } if (cd->cert_context) { CertFreeCertificateContext(cd->cert_context); } - free(rsa->meth->app_data); - free((char *) rsa->meth); - rsa->meth = NULL; + free(cd); + RSA_meth_free((RSA_METHOD*) rsa_meth); return 1; } @@ -412,9 +463,9 @@ SSL_CTX_use_CryptoAPI_certificate(SSL_CTX *ssl_ctx, const char *cert_prop) X509 *cert = NULL; RSA *rsa = NULL, *pub_rsa; CAPI_DATA *cd = calloc(1, sizeof(*cd)); - RSA_METHOD *my_rsa_method = calloc(1, sizeof(*my_rsa_method)); + RSA_METHOD *my_rsa_method = NULL; - if (cd == NULL || my_rsa_method == NULL) + if (cd == NULL) { SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE, ERR_R_MALLOC_FAILURE); goto err; @@ -457,8 +508,11 @@ SSL_CTX_use_CryptoAPI_certificate(SSL_CTX *ssl_ctx, const char *cert_prop) } /* set up stuff to use the private key */ - if (!CryptAcquireCertificatePrivateKey(cd->cert_context, CRYPT_ACQUIRE_COMPARE_KEY_FLAG, - NULL, &cd->crypt_prov, &cd->key_spec, &cd->free_crypt_prov)) + /* We prefer to get an NCRYPT key handle so that TLS1.2 can be supported */ + DWORD flags = CRYPT_ACQUIRE_COMPARE_KEY_FLAG + | CRYPT_ACQUIRE_PREFER_NCRYPT_KEY_FLAG; + if (!CryptAcquireCertificatePrivateKey(cd->cert_context, flags, NULL, + &cd->crypt_prov, &cd->key_spec, &cd->free_crypt_prov)) { /* if we don't have a smart card reader here, and we try to access a * smart card certificate, we get: @@ -469,15 +523,37 @@ SSL_CTX_use_CryptoAPI_certificate(SSL_CTX *ssl_ctx, const char *cert_prop) /* here we don't need to do CryptGetUserKey() or anything; all necessary key * info is in cd->cert_context, and then, in cd->crypt_prov. */ - my_rsa_method->name = "Microsoft CryptoAPI RSA Method"; - my_rsa_method->rsa_pub_enc = rsa_pub_enc; - my_rsa_method->rsa_pub_dec = rsa_pub_dec; - my_rsa_method->rsa_priv_enc = rsa_priv_enc; - my_rsa_method->rsa_priv_dec = rsa_priv_dec; - /* my_rsa_method->init = init; */ - my_rsa_method->finish = finish; - my_rsa_method->flags = RSA_METHOD_FLAG_NO_CHECK; - my_rsa_method->app_data = (char *) cd; + /* if we do not have an NCRYPT key handle restrict TLS to v1.1 or lower */ + int max_version = SSL_CTX_get_max_proto_version(ssl_ctx); + if ((!max_version || max_version > TLS1_1_VERSION) + && cd->key_spec != CERT_NCRYPT_KEY_SPEC) + { + msg(M_WARN, "WARNING: cryptoapicert: private key is in a legacy store." + " Restricting TLS version to 1.1"); + if (SSL_CTX_get_min_proto_version(ssl_ctx) > TLS1_1_VERSION) + { + msg(M_NONFATAL, + "ERROR: cryptoapicert: min TLS version larger than 1.1." + " Try config option --tls-version-min 1.1"); + goto err; + } + if (!SSL_CTX_set_max_proto_version(ssl_ctx, TLS1_1_VERSION)) + { + msg(M_NONFATAL, "ERROR: cryptoapicert: set max TLS version failed"); + goto err; + } + } + + my_rsa_method = RSA_meth_new("Microsoft Cryptography API RSA Method", + RSA_METHOD_FLAG_NO_CHECK); + check_malloc_return(my_rsa_method); + RSA_meth_set_pub_enc(my_rsa_method, rsa_pub_enc); + RSA_meth_set_pub_dec(my_rsa_method, rsa_pub_dec); + RSA_meth_set_priv_enc(my_rsa_method, rsa_priv_enc); + RSA_meth_set_priv_dec(my_rsa_method, rsa_priv_dec); + RSA_meth_set_init(my_rsa_method, NULL); + RSA_meth_set_finish(my_rsa_method, finish); + RSA_meth_set0_app_data(my_rsa_method, cd); rsa = RSA_new(); if (rsa == NULL) @@ -486,23 +562,35 @@ SSL_CTX_use_CryptoAPI_certificate(SSL_CTX *ssl_ctx, const char *cert_prop) goto err; } - /* cert->cert_info->key->pkey is NULL until we call SSL_CTX_use_certificate(), + /* Public key in cert is NULL until we call SSL_CTX_use_certificate(), * so we do it here then... */ if (!SSL_CTX_use_certificate(ssl_ctx, cert)) { goto err; } /* the public key */ - pub_rsa = cert->cert_info->key->pkey->pkey.rsa; + EVP_PKEY *pkey = X509_get0_pubkey(cert); + /* SSL_CTX_use_certificate() increased the reference count in 'cert', so * we decrease it here with X509_free(), or it will never be cleaned up. */ X509_free(cert); cert = NULL; - /* I'm not sure about what we have to fill in in the RSA, trying out stuff... */ - /* rsa->n indicates the key size */ - rsa->n = BN_dup(pub_rsa->n); - rsa->flags |= RSA_FLAG_EXT_PKEY; + if (!(pub_rsa = EVP_PKEY_get0_RSA(pkey))) + { + msg(M_WARN, "cryptoapicert requires an RSA certificate"); + goto err; + } + + /* Our private key is external, so we fill in only n and e from the public key */ + const BIGNUM *n = NULL; + const BIGNUM *e = NULL; + RSA_get0_key(pub_rsa, &n, &e, NULL); + if (!RSA_set0_key(rsa, BN_dup(n), BN_dup(e), NULL)) + { + goto err; + } + RSA_set_flags(rsa, RSA_flags(rsa) | RSA_FLAG_EXT_PKEY); if (!RSA_set_method(rsa, my_rsa_method)) { goto err; @@ -536,7 +624,14 @@ err: { if (cd->free_crypt_prov && cd->crypt_prov) { - CryptReleaseContext(cd->crypt_prov, 0); + if (cd->key_spec == CERT_NCRYPT_KEY_SPEC) + { + NCryptFreeObject(cd->crypt_prov); + } + else + { + CryptReleaseContext(cd->crypt_prov, 0); + } } if (cd->cert_context) { -- cgit v1.2.3