diff options
Diffstat (limited to 'src/utils_luks.c')
| -rw-r--r-- | src/utils_luks.c | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/src/utils_luks.c b/src/utils_luks.c new file mode 100644 index 0000000..6a10ab6 --- /dev/null +++ b/src/utils_luks.c @@ -0,0 +1,274 @@ +/* + * Helper utilities for LUKS2 features + * + * Copyright (C) 2018-2023 Red Hat, Inc. All rights reserved. + * Copyright (C) 2018-2023 Milan Broz + * Copyright (C) 2018-2023 Ondrej Kozina + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "cryptsetup.h" +#include "cryptsetup_args.h" +#include "utils_luks.h" + +extern const char *set_pbkdf; + +const char *luksType(const char *type) +{ + if (type && !strcmp(type, "luks2")) + return CRYPT_LUKS2; + + if (type && !strcmp(type, "luks1")) + return CRYPT_LUKS1; + + if (type && !strcmp(type, "luks")) + return CRYPT_LUKS; /* NULL */ + + if (type && *type) + return type; + + return CRYPT_LUKS; /* NULL */ +} + +bool isLUKS1(const char *type) +{ + return type && !strcmp(type, CRYPT_LUKS1); +} + +bool isLUKS2(const char *type) +{ + return type && !strcmp(type, CRYPT_LUKS2); +} + +int verify_passphrase(int def) +{ + /* Batch mode switch off verify - if not overridden by -y */ + if (ARG_SET(OPT_VERIFY_PASSPHRASE_ID)) + def = 1; + else if (ARG_SET(OPT_BATCH_MODE_ID)) + def = 0; + + /* Non-tty input doesn't allow verify */ + if (def && !isatty(STDIN_FILENO)) { + if (ARG_SET(OPT_VERIFY_PASSPHRASE_ID)) + log_err(_("Can't do passphrase verification on non-tty inputs.")); + def = 0; + } + + return def; +} + +void set_activation_flags(uint32_t *flags) +{ + if (ARG_SET(OPT_READONLY_ID)) + *flags |= CRYPT_ACTIVATE_READONLY; + + if (ARG_SET(OPT_ALLOW_DISCARDS_ID)) + *flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS; + + if (ARG_SET(OPT_PERF_SAME_CPU_CRYPT_ID)) + *flags |= CRYPT_ACTIVATE_SAME_CPU_CRYPT; + + if (ARG_SET(OPT_PERF_SUBMIT_FROM_CRYPT_CPUS_ID)) + *flags |= CRYPT_ACTIVATE_SUBMIT_FROM_CRYPT_CPUS; + + if (ARG_SET(OPT_PERF_NO_READ_WORKQUEUE_ID)) + *flags |= CRYPT_ACTIVATE_NO_READ_WORKQUEUE; + + if (ARG_SET(OPT_PERF_NO_WRITE_WORKQUEUE_ID)) + *flags |= CRYPT_ACTIVATE_NO_WRITE_WORKQUEUE; + + if (ARG_SET(OPT_INTEGRITY_NO_JOURNAL_ID)) + *flags |= CRYPT_ACTIVATE_NO_JOURNAL; + + /* In persistent mode, we use what is set on command line */ + if (ARG_SET(OPT_PERSISTENT_ID)) + *flags |= CRYPT_ACTIVATE_IGNORE_PERSISTENT; + + /* Only for LUKS2 but ignored elsewhere */ + if (ARG_SET(OPT_TEST_PASSPHRASE_ID) && + (ARG_SET(OPT_KEY_SLOT_ID) || ARG_SET(OPT_UNBOUND_ID))) + *flags |= CRYPT_ACTIVATE_ALLOW_UNBOUND_KEY; + + if (ARG_SET(OPT_SERIALIZE_MEMORY_HARD_PBKDF_ID)) + *flags |= CRYPT_ACTIVATE_SERIALIZE_MEMORY_HARD_PBKDF; + + /* Only for plain */ + if (ARG_SET(OPT_IV_LARGE_SECTORS_ID)) + *flags |= CRYPT_ACTIVATE_IV_LARGE_SECTORS; +} + +int set_pbkdf_params(struct crypt_device *cd, const char *dev_type) +{ + const struct crypt_pbkdf_type *pbkdf_default; + struct crypt_pbkdf_type pbkdf = {}; + + pbkdf_default = crypt_get_pbkdf_default(dev_type); + if (!pbkdf_default) + return -EINVAL; + + pbkdf.type = set_pbkdf ?: pbkdf_default->type; + pbkdf.hash = ARG_STR(OPT_HASH_ID) ?: pbkdf_default->hash; + pbkdf.time_ms = ARG_UINT32(OPT_ITER_TIME_ID) ?: pbkdf_default->time_ms; + if (strcmp(pbkdf.type, CRYPT_KDF_PBKDF2)) { + pbkdf.max_memory_kb = ARG_UINT32(OPT_PBKDF_MEMORY_ID) ?: pbkdf_default->max_memory_kb; + pbkdf.parallel_threads = ARG_UINT32(OPT_PBKDF_PARALLEL_ID) ?: pbkdf_default->parallel_threads; + } + + if (ARG_SET(OPT_PBKDF_FORCE_ITERATIONS_ID)) { + pbkdf.iterations = ARG_UINT32(OPT_PBKDF_FORCE_ITERATIONS_ID); + pbkdf.time_ms = 0; + pbkdf.flags |= CRYPT_PBKDF_NO_BENCHMARK; + } + + return crypt_set_pbkdf_type(cd, &pbkdf); +} + +int set_tries_tty(void) +{ + return (tools_is_stdin(ARG_STR(OPT_KEY_FILE_ID)) && isatty(STDIN_FILENO)) ? ARG_UINT32(OPT_TRIES_ID) : 1; +} + +int get_adjusted_key_size(const char *cipher_mode, uint32_t default_size_bits, int integrity_keysize) +{ + uint32_t keysize_bits = ARG_UINT32(OPT_KEY_SIZE_ID); + +#ifdef ENABLE_LUKS_ADJUST_XTS_KEYSIZE + if (!ARG_SET(OPT_KEY_SIZE_ID) && !strncmp(cipher_mode, "xts-", 4)) { + if (default_size_bits == 128) + keysize_bits = 256; + else if (default_size_bits == 256) + keysize_bits = 512; + } +#endif + return (keysize_bits ?: default_size_bits) / 8 + integrity_keysize; +} + +/* + * FIXME: 4MiBs is max LUKS2 mda length (including binary header). + * In future, read max allowed JSON size from config section. + */ +#define LUKS2_MAX_MDA_SIZE 0x400000 +int tools_read_json_file(const char *file, char **json, size_t *json_size, bool batch_mode) +{ + ssize_t ret; + int fd, block, r; + void *buf = NULL; + + block = tools_signals_blocked(); + if (block) + set_int_block(0); + + if (tools_is_stdin(file)) { + fd = STDIN_FILENO; + log_dbg("STDIN descriptor JSON read requested."); + } else { + log_dbg("File descriptor JSON read requested."); + fd = open(file, O_RDONLY); + if (fd < 0) { + log_err(_("Failed to open file %s in read-only mode."), file); + r = -EINVAL; + goto out; + } + } + + buf = malloc(LUKS2_MAX_MDA_SIZE); + if (!buf) { + r = -ENOMEM; + goto out; + } + + if (isatty(fd) && !batch_mode) + log_std(_("Provide valid LUKS2 token JSON:\n")); + + /* we expect JSON (string) */ + r = 0; + ret = read_buffer_intr(fd, buf, LUKS2_MAX_MDA_SIZE - 1, &quit); + if (ret < 0) { + r = -EIO; + log_err(_("Failed to read JSON file.")); + goto out; + } + check_signal(&r); + if (r) { + log_err(_("\nRead interrupted.")); + goto out; + } + + *json_size = (size_t)ret; + *json = buf; + *(*json + ret) = '\0'; +out: + if (block && !quit) + set_int_block(1); + if (fd >= 0 && fd != STDIN_FILENO) + close(fd); + if (r && buf) { + memset(buf, 0, LUKS2_MAX_MDA_SIZE); + free(buf); + } + return r; +} + +int tools_write_json_file(const char *file, const char *json) +{ + int block, fd, r; + size_t json_len; + ssize_t ret; + + if (!json || !(json_len = strlen(json)) || json_len >= LUKS2_MAX_MDA_SIZE) + return -EINVAL; + + block = tools_signals_blocked(); + if (block) + set_int_block(0); + + if (tools_is_stdin(file)) { + fd = STDOUT_FILENO; + log_dbg("STDOUT descriptor JSON write requested."); + } else { + log_dbg("File descriptor JSON write requested."); + fd = open(file, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR); + } + + if (fd < 0) { + log_err(_("Failed to open file %s in write mode."), file ?: ""); + r = -EINVAL; + goto out; + } + + r = 0; + ret = write_buffer_intr(fd, json, json_len, &quit); + check_signal(&r); + if (r) { + log_err(_("\nWrite interrupted.")); + goto out; + } + if (ret < 0 || (size_t)ret != json_len) { + log_err(_("Failed to write JSON file.")); + r = -EIO; + goto out; + } + + if (isatty(fd)) + (void) write_buffer_intr(fd, "\n", 1, &quit); +out: + if (block && !quit) + set_int_block(1); + if (fd >=0 && fd != STDOUT_FILENO) + close(fd); + return r; +} |