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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 17:44:12 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 17:44:12 +0000
commit1be69c2c660b70ac2f4de2a5326e27e3e60eb82d (patch)
treebb299ab6f411f4fccd735907035de710e4ec6abc /lib/crypto_backend/crypto_kernel.c
parentInitial commit. (diff)
downloadcryptsetup-1be69c2c660b70ac2f4de2a5326e27e3e60eb82d.tar.xz
cryptsetup-1be69c2c660b70ac2f4de2a5326e27e3e60eb82d.zip
Adding upstream version 2:2.3.7.upstream/2%2.3.7upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/crypto_backend/crypto_kernel.c')
-rw-r--r--lib/crypto_backend/crypto_kernel.c418
1 files changed, 418 insertions, 0 deletions
diff --git a/lib/crypto_backend/crypto_kernel.c b/lib/crypto_backend/crypto_kernel.c
new file mode 100644
index 0000000..2881ed4
--- /dev/null
+++ b/lib/crypto_backend/crypto_kernel.c
@@ -0,0 +1,418 @@
+/*
+ * Linux kernel userspace API 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 <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <sys/utsname.h>
+#include <linux/if_alg.h>
+#include "crypto_backend_internal.h"
+
+/* FIXME: remove later */
+#ifndef AF_ALG
+#define AF_ALG 38
+#endif
+#ifndef SOL_ALG
+#define SOL_ALG 279
+#endif
+
+static int crypto_backend_initialised = 0;
+static char version[256];
+
+struct hash_alg {
+ const char *name;
+ const char *kernel_name;
+ int length;
+ unsigned int block_length;
+};
+
+static struct hash_alg hash_algs[] = {
+ { "sha1", "sha1", 20, 64 },
+ { "sha224", "sha224", 28, 64 },
+ { "sha256", "sha256", 32, 64 },
+ { "sha384", "sha384", 48, 128 },
+ { "sha512", "sha512", 64, 128 },
+ { "ripemd160", "rmd160", 20, 64 },
+ { "whirlpool", "wp512", 64, 64 },
+ { "sha3-224", "sha3-224", 28, 144 },
+ { "sha3-256", "sha3-256", 32, 136 },
+ { "sha3-384", "sha3-384", 48, 104 },
+ { "sha3-512", "sha3-512", 64, 72 },
+ { "stribog256","streebog256", 32, 64 },
+ { "stribog512","streebog512", 64, 64 },
+ { "sm3", "sm3", 32, 64 },
+ { "blake2b-160","blake2b-160",20, 128 },
+ { "blake2b-256","blake2b-256",32, 128 },
+ { "blake2b-384","blake2b-384",48, 128 },
+ { "blake2b-512","blake2b-512",64, 128 },
+ { "blake2s-128","blake2s-128",16, 64 },
+ { "blake2s-160","blake2s-160",20, 64 },
+ { "blake2s-224","blake2s-224",28, 64 },
+ { "blake2s-256","blake2s-256",32, 64 },
+ { NULL, NULL, 0, 0 }
+};
+
+struct crypt_hash {
+ int tfmfd;
+ int opfd;
+ int hash_len;
+};
+
+struct crypt_hmac {
+ int tfmfd;
+ int opfd;
+ int hash_len;
+};
+
+struct crypt_cipher {
+ struct crypt_cipher_kernel ck;
+};
+
+static int crypt_kernel_socket_init(struct sockaddr_alg *sa, int *tfmfd, int *opfd,
+ const void *key, size_t key_length)
+{
+ *tfmfd = socket(AF_ALG, SOCK_SEQPACKET, 0);
+ if (*tfmfd < 0)
+ return -ENOTSUP;
+
+ if (bind(*tfmfd, (struct sockaddr *)sa, sizeof(*sa)) < 0) {
+ close(*tfmfd);
+ *tfmfd = -1;
+ return -ENOENT;
+ }
+
+ if (key && setsockopt(*tfmfd, SOL_ALG, ALG_SET_KEY, key, key_length) < 0) {
+ close(*tfmfd);
+ *tfmfd = -1;
+ return -EINVAL;
+ }
+
+ *opfd = accept(*tfmfd, NULL, 0);
+ if (*opfd < 0) {
+ close(*tfmfd);
+ *tfmfd = -1;
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+int crypt_backend_init(void)
+{
+ struct utsname uts;
+ struct sockaddr_alg sa = {
+ .salg_family = AF_ALG,
+ .salg_type = "hash",
+ .salg_name = "sha256",
+ };
+ int r, tfmfd = -1, opfd = -1;
+
+ if (crypto_backend_initialised)
+ return 0;
+
+ if (uname(&uts) == -1 || strcmp(uts.sysname, "Linux"))
+ return -EINVAL;
+
+ r = snprintf(version, sizeof(version), "%s %s kernel cryptoAPI",
+ uts.sysname, uts.release);
+ if (r < 0 || (size_t)r >= sizeof(version))
+ return -EINVAL;
+
+ if (crypt_kernel_socket_init(&sa, &tfmfd, &opfd, NULL, 0) < 0)
+ return -EINVAL;
+
+ close(tfmfd);
+ close(opfd);
+
+ crypto_backend_initialised = 1;
+ return 0;
+}
+
+void crypt_backend_destroy(void)
+{
+ crypto_backend_initialised = 0;
+}
+
+uint32_t crypt_backend_flags(void)
+{
+ return CRYPT_BACKEND_KERNEL;
+}
+
+const char *crypt_backend_version(void)
+{
+ return crypto_backend_initialised ? version : "";
+}
+
+static struct hash_alg *_get_alg(const char *name)
+{
+ int i = 0;
+
+ while (name && hash_algs[i].name) {
+ if (!strcmp(name, hash_algs[i].name))
+ return &hash_algs[i];
+ i++;
+ }
+ return NULL;
+}
+
+/* HASH */
+int crypt_hash_size(const char *name)
+{
+ struct hash_alg *ha = _get_alg(name);
+
+ return ha ? ha->length : -EINVAL;
+}
+
+int crypt_hash_init(struct crypt_hash **ctx, const char *name)
+{
+ struct crypt_hash *h;
+ struct hash_alg *ha;
+ struct sockaddr_alg sa = {
+ .salg_family = AF_ALG,
+ .salg_type = "hash",
+ };
+
+ h = malloc(sizeof(*h));
+ if (!h)
+ return -ENOMEM;
+
+ ha = _get_alg(name);
+ if (!ha) {
+ free(h);
+ return -EINVAL;
+ }
+ h->hash_len = ha->length;
+
+ strncpy((char *)sa.salg_name, ha->kernel_name, sizeof(sa.salg_name)-1);
+
+ if (crypt_kernel_socket_init(&sa, &h->tfmfd, &h->opfd, NULL, 0) < 0) {
+ free(h);
+ return -EINVAL;
+ }
+
+ *ctx = h;
+ return 0;
+}
+
+int crypt_hash_write(struct crypt_hash *ctx, const char *buffer, size_t length)
+{
+ ssize_t r;
+
+ r = send(ctx->opfd, buffer, length, MSG_MORE);
+ if (r < 0 || (size_t)r < length)
+ return -EIO;
+
+ return 0;
+}
+
+int crypt_hash_final(struct crypt_hash *ctx, char *buffer, size_t length)
+{
+ ssize_t r;
+
+ if (length > (size_t)ctx->hash_len)
+ return -EINVAL;
+
+ r = read(ctx->opfd, buffer, length);
+ if (r < 0)
+ return -EIO;
+
+ return 0;
+}
+
+void crypt_hash_destroy(struct crypt_hash *ctx)
+{
+ if (ctx->tfmfd >= 0)
+ close(ctx->tfmfd);
+ if (ctx->opfd >= 0)
+ close(ctx->opfd);
+ 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;
+ struct hash_alg *ha;
+ struct sockaddr_alg sa = {
+ .salg_family = AF_ALG,
+ .salg_type = "hash",
+ };
+ int r;
+
+ h = malloc(sizeof(*h));
+ if (!h)
+ return -ENOMEM;
+
+ ha = _get_alg(name);
+ if (!ha) {
+ free(h);
+ return -EINVAL;
+ }
+ h->hash_len = ha->length;
+
+ r = snprintf((char *)sa.salg_name, sizeof(sa.salg_name),
+ "hmac(%s)", ha->kernel_name);
+ if (r < 0 || (size_t)r >= sizeof(sa.salg_name)) {
+ free(h);
+ return -EINVAL;
+ }
+
+ if (crypt_kernel_socket_init(&sa, &h->tfmfd, &h->opfd, key, key_length) < 0) {
+ free(h);
+ return -EINVAL;
+ }
+
+ *ctx = h;
+ return 0;
+}
+
+int crypt_hmac_write(struct crypt_hmac *ctx, const char *buffer, size_t length)
+{
+ ssize_t r;
+
+ r = send(ctx->opfd, buffer, length, MSG_MORE);
+ if (r < 0 || (size_t)r < length)
+ return -EIO;
+
+ return 0;
+}
+
+int crypt_hmac_final(struct crypt_hmac *ctx, char *buffer, size_t length)
+{
+ ssize_t r;
+
+ if (length > (size_t)ctx->hash_len)
+ return -EINVAL;
+
+ r = read(ctx->opfd, buffer, length);
+ if (r < 0)
+ return -EIO;
+
+ return 0;
+}
+
+void crypt_hmac_destroy(struct crypt_hmac *ctx)
+{
+ if (ctx->tfmfd >= 0)
+ close(ctx->tfmfd);
+ if (ctx->opfd >= 0)
+ close(ctx->opfd);
+ memset(ctx, 0, sizeof(*ctx));
+ free(ctx);
+}
+
+/* RNG - N/A */
+int crypt_backend_rng(char *buffer, size_t length, int quality, int fips)
+{
+ return -EINVAL;
+}
+
+/* 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)
+{
+ struct hash_alg *ha;
+
+ if (!kdf)
+ return -EINVAL;
+
+ if (!strcmp(kdf, "pbkdf2")) {
+ ha = _get_alg(hash);
+ if (!ha)
+ return -EINVAL;
+
+ return pkcs5_pbkdf2(hash, password, password_length, salt, salt_length,
+ iterations, key_length, key, ha->block_length);
+ } 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 */
+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;
+
+ r = crypt_cipher_init_kernel(&h->ck, name, mode, key, key_length);
+ if (r < 0) {
+ free(h);
+ return r;
+ }
+
+ *ctx = h;
+ return 0;
+}
+
+void crypt_cipher_destroy(struct crypt_cipher *ctx)
+{
+ crypt_cipher_destroy_kernel(&ctx->ck);
+ 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)
+{
+ return crypt_cipher_encrypt_kernel(&ctx->ck, in, out, length, iv, iv_length);
+}
+
+int crypt_cipher_decrypt(struct crypt_cipher *ctx,
+ const char *in, char *out, size_t length,
+ const char *iv, size_t iv_length)
+{
+ return crypt_cipher_decrypt_kernel(&ctx->ck, in, out, length, iv, iv_length);
+}
+
+bool crypt_cipher_kernel_only(struct crypt_cipher *ctx)
+{
+ return true;
+}
+
+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)
+{
+ return crypt_bitlk_decrypt_key_kernel(key, key_length, in, out, length,
+ iv, iv_length, tag, tag_length);
+}