1 files changed, 552 insertions, 0 deletions
diff --git a/lib/crypto_backend/crypto_gcrypt.c b/lib/crypto_backend/crypto_gcrypt.c
new file mode 100644
index 0000000..698b52a
--- /dev/null
+++ b/lib/crypto_backend/crypto_gcrypt.c
@@ -0,0 +1,552 @@
+/*
+ * GCRYPT crypto backend implementation
+ *
+ * Copyright (C) 2010-2021 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2010-2021 Milan Broz
+ *
+ * This file 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 file 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 file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <assert.h>
+#include <gcrypt.h>
+#include "crypto_backend_internal.h"
+
+static int crypto_backend_initialised = 0;
+static int crypto_backend_secmem = 1;
+static int crypto_backend_whirlpool_bug = -1;
+static char version[64];
+
+struct crypt_hash {
+	gcry_md_hd_t hd;
+	int hash_id;
+	int hash_len;
+};
+
+struct crypt_hmac {
+	gcry_md_hd_t hd;
+	int hash_id;
+	int hash_len;
+};
+
+struct crypt_cipher {
+	bool use_kernel;
+	union {
+	struct crypt_cipher_kernel kernel;
+	gcry_cipher_hd_t hd;
+	} u;
+};
+
+struct hash_alg {
+	const char *name;
+	const char *gcrypt_name;
+};
+
+/*
+ * Test for wrong Whirlpool variant,
+ * Ref: https://lists.gnupg.org/pipermail/gcrypt-devel/2014-January/002889.html
+ */
+static void crypt_hash_test_whirlpool_bug(void)
+{
+	struct crypt_hash *h;
+	char buf[2] = "\0\0", hash_out1[64], hash_out2[64];
+	int r;
+
+	if (crypto_backend_whirlpool_bug >= 0)
+		return;
+
+	crypto_backend_whirlpool_bug = 0;
+	if (crypt_hash_init(&h, "whirlpool"))
+		return;
+
+	/* One shot */
+	if ((r = crypt_hash_write(h, &buf[0], 2)) ||
+	    (r = crypt_hash_final(h, hash_out1, 64))) {
+		crypt_hash_destroy(h);
+		return;
+	}
+
+	/* Split buf (crypt_hash_final resets hash state) */
+	if ((r = crypt_hash_write(h, &buf[0], 1)) ||
+	    (r = crypt_hash_write(h, &buf[1], 1)) ||
+	    (r = crypt_hash_final(h, hash_out2, 64))) {
+		crypt_hash_destroy(h);
+		return;
+	}
+
+	crypt_hash_destroy(h);
+
+	if (memcmp(hash_out1, hash_out2, 64))
+		crypto_backend_whirlpool_bug = 1;
+}
+
+int crypt_backend_init(void)
+{
+	int r;
+
+	if (crypto_backend_initialised)
+		return 0;
+
+	if (!gcry_control (GCRYCTL_INITIALIZATION_FINISHED_P)) {
+		if (!gcry_check_version (GCRYPT_REQ_VERSION)) {
+			return -ENOSYS;
+		}
+
+/* FIXME: If gcrypt compiled to support POSIX 1003.1e capabilities,
+ * it drops all privileges during secure memory initialisation.
+ * For now, the only workaround is to disable secure memory in gcrypt.
+ * cryptsetup always need at least cap_sys_admin privilege for dm-ioctl
+ * and it locks its memory space anyway.
+ */
+#if 0
+		gcry_control (GCRYCTL_DISABLE_SECMEM);
+		crypto_backend_secmem = 0;
+#else
+
+		gcry_control (GCRYCTL_SUSPEND_SECMEM_WARN);
+		gcry_control (GCRYCTL_INIT_SECMEM, 16384, 0);
+		gcry_control (GCRYCTL_RESUME_SECMEM_WARN);
+#endif
+		gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
+	}
+
+	crypto_backend_initialised = 1;
+	crypt_hash_test_whirlpool_bug();
+
+	r = snprintf(version, sizeof(version), "gcrypt %s%s%s",
+		 gcry_check_version(NULL),
+		 crypto_backend_secmem ? "" : ", secmem disabled",
+		 crypto_backend_whirlpool_bug > 0 ? ", flawed whirlpool" : "");
+	if (r < 0 || (size_t)r >= sizeof(version))
+		return -EINVAL;
+
+	return 0;
+}
+
+void crypt_backend_destroy(void)
+{
+	if (crypto_backend_initialised)
+		gcry_control(GCRYCTL_TERM_SECMEM);
+
+	crypto_backend_initialised = 0;
+}
+
+const char *crypt_backend_version(void)
+{
+	return crypto_backend_initialised ? version : "";
+}
+
+uint32_t crypt_backend_flags(void)
+{
+	return 0;
+}
+
+static const char *crypt_hash_compat_name(const char *name, unsigned int *flags)
+{
+	const char *hash_name = name;
+	int i;
+	static struct hash_alg hash_algs[] = {
+	{ "blake2b-160", "blake2b_160" },
+	{ "blake2b-256", "blake2b_256" },
+	{ "blake2b-384", "blake2b_384" },
+	{ "blake2b-512", "blake2b_512" },
+	{ "blake2s-128", "blake2s_128" },
+	{ "blake2s-160", "blake2s_160" },
+	{ "blake2s-224", "blake2s_224" },
+	{ "blake2s-256", "blake2s_256" },
+	{ NULL,          NULL,         }};
+
+	if (!name)
+		return NULL;
+
+	/* "whirlpool_gcryptbug" is out shortcut to flawed whirlpool
+	 * in libgcrypt < 1.6.0 */
+	if (!strcasecmp(name, "whirlpool_gcryptbug")) {
+#if GCRYPT_VERSION_NUMBER >= 0x010601
+		if (flags)
+			*flags |= GCRY_MD_FLAG_BUGEMU1;
+#endif
+		hash_name = "whirlpool";
+	}
+
+	i = 0;
+	while (hash_algs[i].name) {
+		if (!strcasecmp(name, hash_algs[i].name)) {
+			hash_name =  hash_algs[i].gcrypt_name;
+			break;
+		}
+		i++;
+	}
+
+	return hash_name;
+}
+
+/* HASH */
+int crypt_hash_size(const char *name)
+{
+	int hash_id;
+
+	assert(crypto_backend_initialised);
+
+	hash_id = gcry_md_map_name(crypt_hash_compat_name(name, NULL));
+	if (!hash_id)
+		return -EINVAL;
+
+	return gcry_md_get_algo_dlen(hash_id);
+}
+
+int crypt_hash_init(struct crypt_hash **ctx, const char *name)
+{
+	struct crypt_hash *h;
+	unsigned int flags = 0;
+
+	assert(crypto_backend_initialised);
+
+	h = malloc(sizeof(*h));
+	if (!h)
+		return -ENOMEM;
+
+	h->hash_id = gcry_md_map_name(crypt_hash_compat_name(name, &flags));
+	if (!h->hash_id) {
+		free(h);
+		return -EINVAL;
+	}
+
+	if (gcry_md_open(&h->hd, h->hash_id, flags)) {
+		free(h);
+		return -EINVAL;
+	}
+
+	h->hash_len = gcry_md_get_algo_dlen(h->hash_id);
+	*ctx = h;
+	return 0;
+}
+
+static void crypt_hash_restart(struct crypt_hash *ctx)
+{
+	gcry_md_reset(ctx->hd);
+}
+
+int crypt_hash_write(struct crypt_hash *ctx, const char *buffer, size_t length)
+{
+	gcry_md_write(ctx->hd, buffer, length);
+	return 0;
+}
+
+int crypt_hash_final(struct crypt_hash *ctx, char *buffer, size_t length)
+{
+	unsigned char *hash;
+
+	if (length > (size_t)ctx->hash_len)
+		return -EINVAL;
+
+	hash = gcry_md_read(ctx->hd, ctx->hash_id);
+	if (!hash)
+		return -EINVAL;
+
+	memcpy(buffer, hash, length);
+	crypt_hash_restart(ctx);
+
+	return 0;
+}
+
+void crypt_hash_destroy(struct crypt_hash *ctx)
+{
+	gcry_md_close(ctx->hd);
+	memset(ctx, 0, sizeof(*ctx));
+	free(ctx);
+}
+
+/* HMAC */
+int crypt_hmac_size(const char *name)
+{
+	return crypt_hash_size(name);
+}
+
+int crypt_hmac_init(struct crypt_hmac **ctx, const char *name,
+		    const void *key, size_t key_length)
+{
+	struct crypt_hmac *h;
+	unsigned int flags = GCRY_MD_FLAG_HMAC;
+
+	assert(crypto_backend_initialised);
+
+	h = malloc(sizeof(*h));
+	if (!h)
+		return -ENOMEM;
+
+	h->hash_id = gcry_md_map_name(crypt_hash_compat_name(name, &flags));
+	if (!h->hash_id) {
+		free(h);
+		return -EINVAL;
+	}
+
+	if (gcry_md_open(&h->hd, h->hash_id, flags)) {
+		free(h);
+		return -EINVAL;
+	}
+
+	if (gcry_md_setkey(h->hd, key, key_length)) {
+		gcry_md_close(h->hd);
+		free(h);
+		return -EINVAL;
+	}
+
+	h->hash_len = gcry_md_get_algo_dlen(h->hash_id);
+	*ctx = h;
+	return 0;
+}
+
+static void crypt_hmac_restart(struct crypt_hmac *ctx)
+{
+	gcry_md_reset(ctx->hd);
+}
+
+int crypt_hmac_write(struct crypt_hmac *ctx, const char *buffer, size_t length)
+{
+	gcry_md_write(ctx->hd, buffer, length);
+	return 0;
+}
+
+int crypt_hmac_final(struct crypt_hmac *ctx, char *buffer, size_t length)
+{
+	unsigned char *hash;
+
+	if (length > (size_t)ctx->hash_len)
+		return -EINVAL;
+
+	hash = gcry_md_read(ctx->hd, ctx->hash_id);
+	if (!hash)
+		return -EINVAL;
+
+	memcpy(buffer, hash, length);
+	crypt_hmac_restart(ctx);
+
+	return 0;
+}
+
+void crypt_hmac_destroy(struct crypt_hmac *ctx)
+{
+	gcry_md_close(ctx->hd);
+	memset(ctx, 0, sizeof(*ctx));
+	free(ctx);
+}
+
+/* RNG */
+int crypt_backend_rng(char *buffer, size_t length, int quality, int fips)
+{
+	switch(quality) {
+	case CRYPT_RND_NORMAL:
+		gcry_randomize(buffer, length, GCRY_STRONG_RANDOM);
+		break;
+	case CRYPT_RND_SALT:
+	case CRYPT_RND_KEY:
+	default:
+		gcry_randomize(buffer, length, GCRY_VERY_STRONG_RANDOM);
+		break;
+	}
+	return 0;
+}
+
+static int pbkdf2(const char *hash,
+		  const char *password, size_t password_length,
+		  const char *salt, size_t salt_length,
+		  char *key, size_t key_length,
+		  uint32_t iterations)
+{
+	const char *hash_name = crypt_hash_compat_name(hash, NULL);
+
+#if USE_INTERNAL_PBKDF2
+	return pkcs5_pbkdf2(hash_name, password, password_length, salt, salt_length,
+			    iterations, key_length, key, 0);
+#else /* USE_INTERNAL_PBKDF2 */
+	int hash_id = gcry_md_map_name(hash_name);
+
+	if (!hash_id)
+		return -EINVAL;
+
+	if (gcry_kdf_derive(password, password_length, GCRY_KDF_PBKDF2, hash_id,
+	    salt, salt_length, iterations, key_length, key))
+		return -EINVAL;
+
+	return 0;
+#endif /* USE_INTERNAL_PBKDF2 */
+}
+
+/* PBKDF */
+int crypt_pbkdf(const char *kdf, const char *hash,
+		const char *password, size_t password_length,
+		const char *salt, size_t salt_length,
+		char *key, size_t key_length,
+		uint32_t iterations, uint32_t memory, uint32_t parallel)
+{
+	if (!kdf)
+		return -EINVAL;
+
+	if (!strcmp(kdf, "pbkdf2"))
+		return pbkdf2(hash, password, password_length, salt, salt_length,
+			      key, key_length, iterations);
+	else if (!strncmp(kdf, "argon2", 6))
+		return argon2(kdf, password, password_length, salt, salt_length,
+			      key, key_length, iterations, memory, parallel);
+	return -EINVAL;
+}
+
+/* Block ciphers */
+static int _cipher_init(gcry_cipher_hd_t *hd, const char *name,
+			const char *mode, const void *buffer, size_t length)
+{
+	int cipher_id, mode_id;
+
+	cipher_id = gcry_cipher_map_name(name);
+	if (cipher_id == GCRY_CIPHER_MODE_NONE)
+		return -ENOENT;
+
+	if (!strcmp(mode, "ecb"))
+		mode_id = GCRY_CIPHER_MODE_ECB;
+	else if (!strcmp(mode, "cbc"))
+		mode_id = GCRY_CIPHER_MODE_CBC;
+#if HAVE_DECL_GCRY_CIPHER_MODE_XTS
+	else if (!strcmp(mode, "xts"))
+		mode_id = GCRY_CIPHER_MODE_XTS;
+#endif
+	else
+		return -ENOENT;
+
+	if (gcry_cipher_open(hd, cipher_id, mode_id, 0))
+		return -EINVAL;
+
+	if (gcry_cipher_setkey(*hd, buffer, length)) {
+		gcry_cipher_close(*hd);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+int crypt_cipher_init(struct crypt_cipher **ctx, const char *name,
+		    const char *mode, const void *key, size_t key_length)
+{
+	struct crypt_cipher *h;
+	int r;
+
+	h = malloc(sizeof(*h));
+	if (!h)
+		return -ENOMEM;
+
+	if (!_cipher_init(&h->u.hd, name, mode, key, key_length)) {
+		h->use_kernel = false;
+		*ctx = h;
+		return 0;
+	}
+
+	r = crypt_cipher_init_kernel(&h->u.kernel, name, mode, key, key_length);
+	if (r < 0) {
+		free(h);
+		return r;
+	}
+
+	h->use_kernel = true;
+	*ctx = h;
+	return 0;
+}
+
+void crypt_cipher_destroy(struct crypt_cipher *ctx)
+{
+	if (ctx->use_kernel)
+		crypt_cipher_destroy_kernel(&ctx->u.kernel);
+	else
+		gcry_cipher_close(ctx->u.hd);
+	free(ctx);
+}
+
+int crypt_cipher_encrypt(struct crypt_cipher *ctx,
+			 const char *in, char *out, size_t length,
+			 const char *iv, size_t iv_length)
+{
+	if (ctx->use_kernel)
+		return crypt_cipher_encrypt_kernel(&ctx->u.kernel, in, out, length, iv, iv_length);
+
+	if (iv && gcry_cipher_setiv(ctx->u.hd, iv, iv_length))
+		return -EINVAL;
+
+	if (gcry_cipher_encrypt(ctx->u.hd, out, length, in, length))
+		return -EINVAL;
+
+	return 0;
+}
+
+int crypt_cipher_decrypt(struct crypt_cipher *ctx,
+			 const char *in, char *out, size_t length,
+			 const char *iv, size_t iv_length)
+{
+	if (ctx->use_kernel)
+		return crypt_cipher_decrypt_kernel(&ctx->u.kernel, in, out, length, iv, iv_length);
+
+	if (iv && gcry_cipher_setiv(ctx->u.hd, iv, iv_length))
+		return -EINVAL;
+
+	if (gcry_cipher_decrypt(ctx->u.hd, out, length, in, length))
+		return -EINVAL;
+
+	return 0;
+}
+
+bool crypt_cipher_kernel_only(struct crypt_cipher *ctx)
+{
+	return ctx->use_kernel;
+}
+
+int crypt_bitlk_decrypt_key(const void *key, size_t key_length,
+			    const char *in, char *out, size_t length,
+			    const char *iv, size_t iv_length,
+			    const char *tag, size_t tag_length)
+{
+#ifdef GCRY_CCM_BLOCK_LEN
+	gcry_cipher_hd_t hd;
+	uint64_t l[3];
+	int r = -EINVAL;
+
+	if (gcry_cipher_open(&hd, GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_CCM, 0))
+		return -EINVAL;
+
+	if (gcry_cipher_setkey(hd, key, key_length))
+		goto out;
+
+	if (gcry_cipher_setiv(hd, iv, iv_length))
+		goto out;
+
+	l[0] = length;
+	l[1] = 0;
+	l[2] = tag_length;
+	if (gcry_cipher_ctl(hd, GCRYCTL_SET_CCM_LENGTHS, l, sizeof(l)))
+		goto out;
+
+	if (gcry_cipher_decrypt(hd, out, length, in, length))
+		goto out;
+
+	if (gcry_cipher_checktag(hd, tag, tag_length))
+		goto out;
+
+	r = 0;
+out:
+	gcry_cipher_close(hd);
+	return r;
+#else
+	return -ENOTSUP;
+#endif
+}