diff options
Diffstat (limited to 'src/shared/cryptsetup-util.c')
| -rw-r--r-- | src/shared/cryptsetup-util.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/src/shared/cryptsetup-util.c b/src/shared/cryptsetup-util.c new file mode 100644 index 0000000..34a078e --- /dev/null +++ b/src/shared/cryptsetup-util.c @@ -0,0 +1,111 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#if HAVE_LIBCRYPTSETUP +#include "alloc-util.h" +#include "cryptsetup-util.h" +#include "dlfcn-util.h" +#include "log.h" + +static void *cryptsetup_dl = NULL; + +int (*sym_crypt_activate_by_passphrase)(struct crypt_device *cd, const char *name, int keyslot, const char *passphrase, size_t passphrase_size, uint32_t flags); +#if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY +int (*sym_crypt_activate_by_signed_key)(struct crypt_device *cd, const char *name, const char *volume_key, size_t volume_key_size, const char *signature, size_t signature_size, uint32_t flags); +#endif +int (*sym_crypt_activate_by_volume_key)(struct crypt_device *cd, const char *name, const char *volume_key, size_t volume_key_size, uint32_t flags); +int (*sym_crypt_deactivate_by_name)(struct crypt_device *cd, const char *name, uint32_t flags); +int (*sym_crypt_format)(struct crypt_device *cd, const char *type, const char *cipher, const char *cipher_mode, const char *uuid, const char *volume_key, size_t volume_key_size, void *params); +void (*sym_crypt_free)(struct crypt_device *cd); +const char *(*sym_crypt_get_dir)(void); +int (*sym_crypt_get_verity_info)(struct crypt_device *cd, struct crypt_params_verity *vp); +int (*sym_crypt_init)(struct crypt_device **cd, const char *device); +int (*sym_crypt_init_by_name)(struct crypt_device **cd, const char *name); +int (*sym_crypt_keyslot_add_by_volume_key)(struct crypt_device *cd, int keyslot, const char *volume_key, size_t volume_key_size, const char *passphrase, size_t passphrase_size); +int (*sym_crypt_load)(struct crypt_device *cd, const char *requested_type, void *params); +int (*sym_crypt_resize)(struct crypt_device *cd, const char *name, uint64_t new_size); +int (*sym_crypt_set_data_device)(struct crypt_device *cd, const char *device); +void (*sym_crypt_set_debug_level)(int level); +void (*sym_crypt_set_log_callback)(struct crypt_device *cd, void (*log)(int level, const char *msg, void *usrptr), void *usrptr); +int (*sym_crypt_volume_key_get)(struct crypt_device *cd, int keyslot, char *volume_key, size_t *volume_key_size, const char *passphrase, size_t passphrase_size); + +int dlopen_cryptsetup(void) { + _cleanup_(dlclosep) void *dl = NULL; + int r; + + if (cryptsetup_dl) + return 0; /* Already loaded */ + + dl = dlopen("libcryptsetup.so.12", RTLD_LAZY); + if (!dl) + return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), + "libcryptsetup support is not installed: %s", dlerror()); + + r = dlsym_many_and_warn( + dl, + LOG_DEBUG, + &sym_crypt_activate_by_passphrase, "crypt_activate_by_passphrase", +#if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY + &sym_crypt_activate_by_signed_key, "crypt_activate_by_signed_key", +#endif + &sym_crypt_activate_by_volume_key, "crypt_activate_by_volume_key", + &sym_crypt_deactivate_by_name, "crypt_deactivate_by_name", + &sym_crypt_format, "crypt_format", + &sym_crypt_free, "crypt_free", + &sym_crypt_get_dir, "crypt_get_dir", + &sym_crypt_get_verity_info, "crypt_get_verity_info", + &sym_crypt_init, "crypt_init", + &sym_crypt_init_by_name, "crypt_init_by_name", + &sym_crypt_keyslot_add_by_volume_key, "crypt_keyslot_add_by_volume_key", + &sym_crypt_load, "crypt_load", + &sym_crypt_resize, "crypt_resize", + &sym_crypt_set_data_device, "crypt_set_data_device", + &sym_crypt_set_debug_level, "crypt_set_debug_level", + &sym_crypt_set_log_callback, "crypt_set_log_callback", + &sym_crypt_volume_key_get, "crypt_volume_key_get", + NULL); + if (r < 0) + return r; + + /* Note that we never release the reference here, because there's no real reason to, after all this + * was traditionally a regular shared library dependency which lives forever too. */ + cryptsetup_dl = TAKE_PTR(dl); + return 1; +} + +static void cryptsetup_log_glue(int level, const char *msg, void *usrptr) { + + switch (level) { + case CRYPT_LOG_NORMAL: + level = LOG_NOTICE; + break; + case CRYPT_LOG_ERROR: + level = LOG_ERR; + break; + case CRYPT_LOG_VERBOSE: + level = LOG_INFO; + break; + case CRYPT_LOG_DEBUG: + level = LOG_DEBUG; + break; + default: + log_error("Unknown libcryptsetup log level: %d", level); + level = LOG_ERR; + } + + log_full(level, "%s", msg); +} + +void cryptsetup_enable_logging(struct crypt_device *cd) { + if (!cd) + return; + + if (dlopen_cryptsetup() < 0) /* If this fails, let's gracefully ignore the issue, this is just debug + * logging after all, and if this failed we already generated a debug + * log message that should help to track things down. */ + return; + + sym_crypt_set_log_callback(cd, cryptsetup_log_glue, NULL); + sym_crypt_set_debug_level(DEBUG_LOGGING ? CRYPT_DEBUG_ALL : CRYPT_DEBUG_NONE); +} + +#endif |