/* * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the OpenSSL license (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ #include "e_os.h" #include #include #include #include #include #include #include #include #include #include #include #include #include "internal/engine.h" #ifdef CRYPTO_ALGORITHM_MIN # define CHECK_BSD_STYLE_MACROS #endif /* * ONE global file descriptor for all sessions. This allows operations * such as digest session data copying (see digest_copy()), but is also * saner... why re-open /dev/crypto for every session? */ static int cfd; /****************************************************************************** * * Ciphers * * Because they all do the same basic operation, we have only one set of * method functions for them all to share, and a mapping table between * NIDs and cryptodev IDs, with all the necessary size data. * *****/ struct cipher_ctx { struct session_op sess; /* to pass from init to do_cipher */ const unsigned char *iv; int op; /* COP_ENCRYPT or COP_DECRYPT */ }; static const struct cipher_data_st { int nid; int blocksize; int keylen; int ivlen; int flags; int devcryptoid; } cipher_data[] = { #ifndef OPENSSL_NO_DES { NID_des_cbc, 8, 8, 8, EVP_CIPH_CBC_MODE, CRYPTO_DES_CBC }, { NID_des_ede3_cbc, 8, 24, 8, EVP_CIPH_CBC_MODE, CRYPTO_3DES_CBC }, #endif #ifndef OPENSSL_NO_BF { NID_bf_cbc, 8, 16, 8, EVP_CIPH_CBC_MODE, CRYPTO_BLF_CBC }, #endif #ifndef OPENSSL_NO_CAST { NID_cast5_cbc, 8, 16, 8, EVP_CIPH_CBC_MODE, CRYPTO_CAST_CBC }, #endif { NID_aes_128_cbc, 16, 128 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC }, { NID_aes_192_cbc, 16, 192 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC }, { NID_aes_256_cbc, 16, 256 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_AES_CBC }, #ifndef OPENSSL_NO_RC4 { NID_rc4, 1, 16, 0, EVP_CIPH_STREAM_CIPHER, CRYPTO_ARC4 }, #endif #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_AES_CTR) { NID_aes_128_ctr, 16, 128 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR }, { NID_aes_192_ctr, 16, 192 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR }, { NID_aes_256_ctr, 16, 256 / 8, 16, EVP_CIPH_CTR_MODE, CRYPTO_AES_CTR }, #endif #if 0 /* Not yet supported */ { NID_aes_128_xts, 16, 128 / 8 * 2, 16, EVP_CIPH_XTS_MODE, CRYPTO_AES_XTS }, { NID_aes_256_xts, 16, 256 / 8 * 2, 16, EVP_CIPH_XTS_MODE, CRYPTO_AES_XTS }, #endif #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_AES_ECB) { NID_aes_128_ecb, 16, 128 / 8, 16, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB }, { NID_aes_192_ecb, 16, 192 / 8, 16, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB }, { NID_aes_256_ecb, 16, 256 / 8, 16, EVP_CIPH_ECB_MODE, CRYPTO_AES_ECB }, #endif #if 0 /* Not yet supported */ { NID_aes_128_gcm, 16, 128 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM }, { NID_aes_192_gcm, 16, 192 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM }, { NID_aes_256_gcm, 16, 256 / 8, 16, EVP_CIPH_GCM_MODE, CRYPTO_AES_GCM }, #endif #ifndef OPENSSL_NO_CAMELLIA { NID_camellia_128_cbc, 16, 128 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_CAMELLIA_CBC }, { NID_camellia_192_cbc, 16, 192 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_CAMELLIA_CBC }, { NID_camellia_256_cbc, 16, 256 / 8, 16, EVP_CIPH_CBC_MODE, CRYPTO_CAMELLIA_CBC }, #endif }; static size_t get_cipher_data_index(int nid) { size_t i; for (i = 0; i < OSSL_NELEM(cipher_data); i++) if (nid == cipher_data[i].nid) return i; /* * Code further down must make sure that only NIDs in the table above * are used. If any other NID reaches this function, there's a grave * coding error further down. */ assert("Code that never should be reached" == NULL); return -1; } static const struct cipher_data_st *get_cipher_data(int nid) { return &cipher_data[get_cipher_data_index(nid)]; } /* * Following are the three necessary functions to map OpenSSL functionality * with cryptodev. */ static int cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, const unsigned char *iv, int enc) { struct cipher_ctx *cipher_ctx = (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx); const struct cipher_data_st *cipher_d = get_cipher_data(EVP_CIPHER_CTX_nid(ctx)); memset(&cipher_ctx->sess, 0, sizeof(cipher_ctx->sess)); cipher_ctx->sess.cipher = cipher_d->devcryptoid; cipher_ctx->sess.keylen = cipher_d->keylen; cipher_ctx->sess.key = (void *)key; cipher_ctx->op = enc ? COP_ENCRYPT : COP_DECRYPT; if (ioctl(cfd, CIOCGSESSION, &cipher_ctx->sess) < 0) { SYSerr(SYS_F_IOCTL, errno); return 0; } return 1; } static int cipher_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl) { struct cipher_ctx *cipher_ctx = (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx); struct crypt_op cryp; #if !defined(COP_FLAG_WRITE_IV) unsigned char saved_iv[EVP_MAX_IV_LENGTH]; #endif memset(&cryp, 0, sizeof(cryp)); cryp.ses = cipher_ctx->sess.ses; cryp.len = inl; cryp.src = (void *)in; cryp.dst = (void *)out; cryp.iv = (void *)EVP_CIPHER_CTX_iv_noconst(ctx); cryp.op = cipher_ctx->op; #if !defined(COP_FLAG_WRITE_IV) cryp.flags = 0; if (EVP_CIPHER_CTX_iv_length(ctx) > 0) { assert(inl >= EVP_CIPHER_CTX_iv_length(ctx)); if (!EVP_CIPHER_CTX_encrypting(ctx)) { unsigned char *ivptr = in + inl - EVP_CIPHER_CTX_iv_length(ctx); memcpy(saved_iv, ivptr, EVP_CIPHER_CTX_iv_length(ctx)); } } #else cryp.flags = COP_FLAG_WRITE_IV; #endif if (ioctl(cfd, CIOCCRYPT, &cryp) < 0) { SYSerr(SYS_F_IOCTL, errno); return 0; } #if !defined(COP_FLAG_WRITE_IV) if (EVP_CIPHER_CTX_iv_length(ctx) > 0) { unsigned char *ivptr = saved_iv; assert(inl >= EVP_CIPHER_CTX_iv_length(ctx)); if (!EVP_CIPHER_CTX_encrypting(ctx)) ivptr = out + inl - EVP_CIPHER_CTX_iv_length(ctx); memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), ivptr, EVP_CIPHER_CTX_iv_length(ctx)); } #endif return 1; } static int cipher_cleanup(EVP_CIPHER_CTX *ctx) { struct cipher_ctx *cipher_ctx = (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx); if (ioctl(cfd, CIOCFSESSION, &cipher_ctx->sess.ses) < 0) { SYSerr(SYS_F_IOCTL, errno); return 0; } return 1; } /* * Keep a table of known nids and associated methods. * Note that known_cipher_nids[] isn't necessarily indexed the same way as * cipher_data[] above, which known_cipher_methods[] is. */ static int known_cipher_nids[OSSL_NELEM(cipher_data)]; static int known_cipher_nids_amount = -1; /* -1 indicates not yet initialised */ static EVP_CIPHER *known_cipher_methods[OSSL_NELEM(cipher_data)] = { NULL, }; static void prepare_cipher_methods(void) { size_t i; struct session_op sess; memset(&sess, 0, sizeof(sess)); sess.key = (void *)"01234567890123456789012345678901234567890123456789"; for (i = 0, known_cipher_nids_amount = 0; i < OSSL_NELEM(cipher_data); i++) { /* * Check that the algo is really availably by trying to open and close * a session. */ sess.cipher = cipher_data[i].devcryptoid; sess.keylen = cipher_data[i].keylen; if (ioctl(cfd, CIOCGSESSION, &sess) < 0 || ioctl(cfd, CIOCFSESSION, &sess.ses) < 0) continue; if ((known_cipher_methods[i] = EVP_CIPHER_meth_new(cipher_data[i].nid, cipher_data[i].blocksize, cipher_data[i].keylen)) == NULL || !EVP_CIPHER_meth_set_iv_length(known_cipher_methods[i], cipher_data[i].ivlen) || !EVP_CIPHER_meth_set_flags(known_cipher_methods[i], cipher_data[i].flags | EVP_CIPH_FLAG_DEFAULT_ASN1) || !EVP_CIPHER_meth_set_init(known_cipher_methods[i], cipher_init) || !EVP_CIPHER_meth_set_do_cipher(known_cipher_methods[i], cipher_do_cipher) || !EVP_CIPHER_meth_set_cleanup(known_cipher_methods[i], cipher_cleanup) || !EVP_CIPHER_meth_set_impl_ctx_size(known_cipher_methods[i], sizeof(struct cipher_ctx))) { EVP_CIPHER_meth_free(known_cipher_methods[i]); known_cipher_methods[i] = NULL; } else { known_cipher_nids[known_cipher_nids_amount++] = cipher_data[i].nid; } } } static const EVP_CIPHER *get_cipher_method(int nid) { size_t i = get_cipher_data_index(nid); if (i == (size_t)-1) return NULL; return known_cipher_methods[i]; } static int get_cipher_nids(const int **nids) { *nids = known_cipher_nids; return known_cipher_nids_amount; } static void destroy_cipher_method(int nid) { size_t i = get_cipher_data_index(nid); EVP_CIPHER_meth_free(known_cipher_methods[i]); known_cipher_methods[i] = NULL; } static void destroy_all_cipher_methods(void) { size_t i; for (i = 0; i < OSSL_NELEM(cipher_data); i++) destroy_cipher_method(cipher_data[i].nid); } static int devcrypto_ciphers(ENGINE *e, const EVP_CIPHER **cipher, const int **nids, int nid) { if (cipher == NULL) return get_cipher_nids(nids); *cipher = get_cipher_method(nid); return *cipher != NULL; } /* * We only support digests if the cryptodev implementation supports multiple * data updates and session copying. Otherwise, we would be forced to maintain * a cache, which is perilous if there's a lot of data coming in (if someone * wants to checksum an OpenSSL tarball, for example). */ #if defined(CIOCCPHASH) && defined(COP_FLAG_UPDATE) && defined(COP_FLAG_FINAL) #define IMPLEMENT_DIGEST /****************************************************************************** * * Digests * * Because they all do the same basic operation, we have only one set of * method functions for them all to share, and a mapping table between * NIDs and cryptodev IDs, with all the necessary size data. * *****/ struct digest_ctx { struct session_op sess; /* This signals that the init function was called, not that it succeeded. */ int init_called; }; static const struct digest_data_st { int nid; int digestlen; int devcryptoid; } digest_data[] = { #ifndef OPENSSL_NO_MD5 { NID_md5, 16, CRYPTO_MD5 }, #endif { NID_sha1, 20, CRYPTO_SHA1 }, #ifndef OPENSSL_NO_RMD160 # if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_RIPEMD160) { NID_ripemd160, 20, CRYPTO_RIPEMD160 }, # endif #endif #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_SHA2_224) { NID_sha224, 224 / 8, CRYPTO_SHA2_224 }, #endif #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_SHA2_256) { NID_sha256, 256 / 8, CRYPTO_SHA2_256 }, #endif #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_SHA2_384) { NID_sha384, 384 / 8, CRYPTO_SHA2_384 }, #endif #if !defined(CHECK_BSD_STYLE_MACROS) || defined(CRYPTO_SHA2_512) { NID_sha512, 512 / 8, CRYPTO_SHA2_512 }, #endif }; static size_t get_digest_data_index(int nid) { size_t i; for (i = 0; i < OSSL_NELEM(digest_data); i++) if (nid == digest_data[i].nid) return i; /* * Code further down must make sure that only NIDs in the table above * are used. If any other NID reaches this function, there's a grave * coding error further down. */ assert("Code that never should be reached" == NULL); return -1; } static const struct digest_data_st *get_digest_data(int nid) { return &digest_data[get_digest_data_index(nid)]; } /* * Following are the four necessary functions to map OpenSSL functionality * with cryptodev. */ static int digest_init(EVP_MD_CTX *ctx) { struct digest_ctx *digest_ctx = (struct digest_ctx *)EVP_MD_CTX_md_data(ctx); const struct digest_data_st *digest_d = get_digest_data(EVP_MD_CTX_type(ctx)); digest_ctx->init_called = 1; memset(&digest_ctx->sess, 0, sizeof(digest_ctx->sess)); digest_ctx->sess.mac = digest_d->devcryptoid; if (ioctl(cfd, CIOCGSESSION, &digest_ctx->sess) < 0) { SYSerr(SYS_F_IOCTL, errno); return 0; } return 1; } static int digest_op(struct digest_ctx *ctx, const void *src, size_t srclen, void *res, unsigned int flags) { struct crypt_op cryp; memset(&cryp, 0, sizeof(cryp)); cryp.ses = ctx->sess.ses; cryp.len = srclen; cryp.src = (void *)src; cryp.dst = NULL; cryp.mac = res; cryp.flags = flags; return ioctl(cfd, CIOCCRYPT, &cryp); } static int digest_update(EVP_MD_CTX *ctx, const void *data, size_t count) { struct digest_ctx *digest_ctx = (struct digest_ctx *)EVP_MD_CTX_md_data(ctx); if (count == 0) return 1; if (digest_ctx == NULL) return 0; if (digest_op(digest_ctx, data, count, NULL, COP_FLAG_UPDATE) < 0) { SYSerr(SYS_F_IOCTL, errno); return 0; } return 1; } static int digest_final(EVP_MD_CTX *ctx, unsigned char *md) { struct digest_ctx *digest_ctx = (struct digest_ctx *)EVP_MD_CTX_md_data(ctx); if (md == NULL || digest_ctx == NULL) return 0; if (digest_op(digest_ctx, NULL, 0, md, COP_FLAG_FINAL) < 0) { SYSerr(SYS_F_IOCTL, errno); return 0; } return 1; } static int digest_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from) { struct digest_ctx *digest_from = (struct digest_ctx *)EVP_MD_CTX_md_data(from); struct digest_ctx *digest_to = (struct digest_ctx *)EVP_MD_CTX_md_data(to); struct cphash_op cphash; if (digest_from == NULL || digest_from->init_called != 1) return 1; if (!digest_init(to)) { SYSerr(SYS_F_IOCTL, errno); return 0; } cphash.src_ses = digest_from->sess.ses; cphash.dst_ses = digest_to->sess.ses; if (ioctl(cfd, CIOCCPHASH, &cphash) < 0) { SYSerr(SYS_F_IOCTL, errno); return 0; } return 1; } static int digest_cleanup(EVP_MD_CTX *ctx) { struct digest_ctx *digest_ctx = (struct digest_ctx *)EVP_MD_CTX_md_data(ctx); if (digest_ctx == NULL) return 1; if (ioctl(cfd, CIOCFSESSION, &digest_ctx->sess.ses) < 0) { SYSerr(SYS_F_IOCTL, errno); return 0; } return 1; } /* * Keep a table of known nids and associated methods. * Note that known_digest_nids[] isn't necessarily indexed the same way as * digest_data[] above, which known_digest_methods[] is. */ static int known_digest_nids[OSSL_NELEM(digest_data)]; static int known_digest_nids_amount = -1; /* -1 indicates not yet initialised */ static EVP_MD *known_digest_methods[OSSL_NELEM(digest_data)] = { NULL, }; static void prepare_digest_methods(void) { size_t i; struct session_op sess; memset(&sess, 0, sizeof(sess)); for (i = 0, known_digest_nids_amount = 0; i < OSSL_NELEM(digest_data); i++) { /* * Check that the algo is really availably by trying to open and close * a session. */ sess.mac = digest_data[i].devcryptoid; if (ioctl(cfd, CIOCGSESSION, &sess) < 0 || ioctl(cfd, CIOCFSESSION, &sess.ses) < 0) continue; if ((known_digest_methods[i] = EVP_MD_meth_new(digest_data[i].nid, NID_undef)) == NULL || !EVP_MD_meth_set_result_size(known_digest_methods[i], digest_data[i].digestlen) || !EVP_MD_meth_set_init(known_digest_methods[i], digest_init) || !EVP_MD_meth_set_update(known_digest_methods[i], digest_update) || !EVP_MD_meth_set_final(known_digest_methods[i], digest_final) || !EVP_MD_meth_set_copy(known_digest_methods[i], digest_copy) || !EVP_MD_meth_set_cleanup(known_digest_methods[i], digest_cleanup) || !EVP_MD_meth_set_app_datasize(known_digest_methods[i], sizeof(struct digest_ctx))) { EVP_MD_meth_free(known_digest_methods[i]); known_digest_methods[i] = NULL; } else { known_digest_nids[known_digest_nids_amount++] = digest_data[i].nid; } } } static const EVP_MD *get_digest_method(int nid) { size_t i = get_digest_data_index(nid); if (i == (size_t)-1) return NULL; return known_digest_methods[i]; } static int get_digest_nids(const int **nids) { *nids = known_digest_nids; return known_digest_nids_amount; } static void destroy_digest_method(int nid) { size_t i = get_digest_data_index(nid); EVP_MD_meth_free(known_digest_methods[i]); known_digest_methods[i] = NULL; } static void destroy_all_digest_methods(void) { size_t i; for (i = 0; i < OSSL_NELEM(digest_data); i++) destroy_digest_method(digest_data[i].nid); } static int devcrypto_digests(ENGINE *e, const EVP_MD **digest, const int **nids, int nid) { if (digest == NULL) return get_digest_nids(nids); *digest = get_digest_method(nid); return *digest != NULL; } #endif /****************************************************************************** * * LOAD / UNLOAD * *****/ static int devcrypto_unload(ENGINE *e) { destroy_all_cipher_methods(); #ifdef IMPLEMENT_DIGEST destroy_all_digest_methods(); #endif close(cfd); return 1; } /* * This engine is always built into libcrypto, so it doesn't offer any * ability to be dynamically loadable. */ void engine_load_devcrypto_int() { ENGINE *e = NULL; if ((cfd = open("/dev/crypto", O_RDWR, 0)) < 0) { fprintf(stderr, "Could not open /dev/crypto: %s\n", strerror(errno)); return; } if ((e = ENGINE_new()) == NULL || !ENGINE_set_destroy_function(e, devcrypto_unload)) { ENGINE_free(e); /* * We know that devcrypto_unload() won't be called when one of the * above two calls have failed, so we close cfd explicitly here to * avoid leaking resources. */ close(cfd); return; } prepare_cipher_methods(); #ifdef IMPLEMENT_DIGEST prepare_digest_methods(); #endif if (!ENGINE_set_id(e, "devcrypto") || !ENGINE_set_name(e, "/dev/crypto engine") /* * Asymmetric ciphers aren't well supported with /dev/crypto. Among the BSD * implementations, it seems to only exist in FreeBSD, and regarding the * parameters in its crypt_kop, the manual crypto(4) has this to say: * * The semantics of these arguments are currently undocumented. * * Reading through the FreeBSD source code doesn't give much more than * their CRK_MOD_EXP implementation for ubsec. * * It doesn't look much better with cryptodev-linux. They have the crypt_kop * structure as well as the command (CRK_*) in cryptodev.h, but no support * seems to be implemented at all for the moment. * * At the time of writing, it seems impossible to write proper support for * FreeBSD's asym features without some very deep knowledge and access to * specific kernel modules. * * /Richard Levitte, 2017-05-11 */ #if 0 # ifndef OPENSSL_NO_RSA || !ENGINE_set_RSA(e, devcrypto_rsa) # endif # ifndef OPENSSL_NO_DSA || !ENGINE_set_DSA(e, devcrypto_dsa) # endif # ifndef OPENSSL_NO_DH || !ENGINE_set_DH(e, devcrypto_dh) # endif # ifndef OPENSSL_NO_EC || !ENGINE_set_EC(e, devcrypto_ec) # endif #endif || !ENGINE_set_ciphers(e, devcrypto_ciphers) #ifdef IMPLEMENT_DIGEST || !ENGINE_set_digests(e, devcrypto_digests) #endif ) { ENGINE_free(e); return; } ENGINE_add(e); ENGINE_free(e); /* Loose our local reference */ ERR_clear_error(); }