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Diffstat (limited to 'src/cryptsetup/cryptsetup-tpm2.c')
-rw-r--r--src/cryptsetup/cryptsetup-tpm2.c314
1 files changed, 0 insertions, 314 deletions
diff --git a/src/cryptsetup/cryptsetup-tpm2.c b/src/cryptsetup/cryptsetup-tpm2.c
deleted file mode 100644
index e7a38d4..0000000
--- a/src/cryptsetup/cryptsetup-tpm2.c
+++ /dev/null
@@ -1,314 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1-or-later */
-
-#include "alloc-util.h"
-#include "ask-password-api.h"
-#include "cryptsetup-tpm2.h"
-#include "env-util.h"
-#include "fileio.h"
-#include "hexdecoct.h"
-#include "json.h"
-#include "parse-util.h"
-#include "random-util.h"
-#include "sha256.h"
-#include "tpm2-util.h"
-
-static int get_pin(usec_t until, AskPasswordFlags ask_password_flags, bool headless, char **ret_pin_str) {
- _cleanup_(erase_and_freep) char *pin_str = NULL;
- _cleanup_strv_free_erase_ char **pin = NULL;
- int r;
-
- assert(ret_pin_str);
-
- r = getenv_steal_erase("PIN", &pin_str);
- if (r < 0)
- return log_error_errno(r, "Failed to acquire PIN from environment: %m");
- if (!r) {
- if (headless)
- return log_error_errno(
- SYNTHETIC_ERRNO(ENOPKG),
- "PIN querying disabled via 'headless' option. "
- "Use the '$PIN' environment variable.");
-
- pin = strv_free_erase(pin);
- r = ask_password_auto(
- "Please enter TPM2 PIN:",
- "drive-harddisk",
- NULL,
- "tpm2-pin",
- "cryptsetup.tpm2-pin",
- until,
- ask_password_flags,
- &pin);
- if (r < 0)
- return log_error_errno(r, "Failed to ask for user pin: %m");
- assert(strv_length(pin) == 1);
-
- pin_str = strdup(pin[0]);
- if (!pin_str)
- return log_oom();
- }
-
- *ret_pin_str = TAKE_PTR(pin_str);
-
- return r;
-}
-
-int acquire_tpm2_key(
- const char *volume_name,
- const char *device,
- uint32_t hash_pcr_mask,
- uint16_t pcr_bank,
- const void *pubkey,
- size_t pubkey_size,
- uint32_t pubkey_pcr_mask,
- const char *signature_path,
- const char *pcrlock_path,
- uint16_t primary_alg,
- const char *key_file,
- size_t key_file_size,
- uint64_t key_file_offset,
- const void *key_data,
- size_t key_data_size,
- const void *policy_hash,
- size_t policy_hash_size,
- const void *salt,
- size_t salt_size,
- const void *srk_buf,
- size_t srk_buf_size,
- TPM2Flags flags,
- usec_t until,
- bool headless,
- AskPasswordFlags ask_password_flags,
- void **ret_decrypted_key,
- size_t *ret_decrypted_key_size) {
-
- _cleanup_(json_variant_unrefp) JsonVariant *signature_json = NULL;
- _cleanup_free_ void *loaded_blob = NULL;
- _cleanup_free_ char *auto_device = NULL;
- size_t blob_size;
- const void *blob;
- int r;
-
- assert(salt || salt_size == 0);
-
- if (!device) {
- r = tpm2_find_device_auto(&auto_device);
- if (r == -ENODEV)
- return -EAGAIN; /* Tell the caller to wait for a TPM2 device to show up */
- if (r < 0)
- return log_error_errno(r, "Could not find TPM2 device: %m");
-
- device = auto_device;
- }
-
- if (key_data) {
- blob = key_data;
- blob_size = key_data_size;
- } else {
- _cleanup_free_ char *bindname = NULL;
-
- /* If we read the salt via AF_UNIX, make this client recognizable */
- if (asprintf(&bindname, "@%" PRIx64"/cryptsetup-tpm2/%s", random_u64(), volume_name) < 0)
- return log_oom();
-
- r = read_full_file_full(
- AT_FDCWD, key_file,
- key_file_offset == 0 ? UINT64_MAX : key_file_offset,
- key_file_size == 0 ? SIZE_MAX : key_file_size,
- READ_FULL_FILE_CONNECT_SOCKET,
- bindname,
- (char**) &loaded_blob, &blob_size);
- if (r < 0)
- return r;
-
- blob = loaded_blob;
- }
-
- if (pubkey_pcr_mask != 0) {
- r = tpm2_load_pcr_signature(signature_path, &signature_json);
- if (r < 0)
- return log_error_errno(r, "Failed to load pcr signature: %m");
- }
-
- _cleanup_(tpm2_pcrlock_policy_done) Tpm2PCRLockPolicy pcrlock_policy = {};
-
- if (FLAGS_SET(flags, TPM2_FLAGS_USE_PCRLOCK)) {
- r = tpm2_pcrlock_policy_load(pcrlock_path, &pcrlock_policy);
- if (r < 0)
- return r;
- }
-
- _cleanup_(tpm2_context_unrefp) Tpm2Context *tpm2_context = NULL;
- r = tpm2_context_new_or_warn(device, &tpm2_context);
- if (r < 0)
- return r;
-
- if (!(flags & TPM2_FLAGS_USE_PIN)) {
- r = tpm2_unseal(tpm2_context,
- hash_pcr_mask,
- pcr_bank,
- pubkey, pubkey_size,
- pubkey_pcr_mask,
- signature_json,
- /* pin= */ NULL,
- FLAGS_SET(flags, TPM2_FLAGS_USE_PCRLOCK) ? &pcrlock_policy : NULL,
- primary_alg,
- blob,
- blob_size,
- policy_hash,
- policy_hash_size,
- srk_buf,
- srk_buf_size,
- ret_decrypted_key,
- ret_decrypted_key_size);
- if (r < 0)
- return log_error_errno(r, "Failed to unseal secret using TPM2: %m");
-
- return r;
- }
-
- for (int i = 5;; i--) {
- _cleanup_(erase_and_freep) char *pin_str = NULL, *b64_salted_pin = NULL;
-
- if (i <= 0)
- return -EACCES;
-
- r = get_pin(until, ask_password_flags, headless, &pin_str);
- if (r < 0)
- return r;
-
- if (salt_size > 0) {
- uint8_t salted_pin[SHA256_DIGEST_SIZE] = {};
- CLEANUP_ERASE(salted_pin);
-
- r = tpm2_util_pbkdf2_hmac_sha256(pin_str, strlen(pin_str), salt, salt_size, salted_pin);
- if (r < 0)
- return log_error_errno(r, "Failed to perform PBKDF2: %m");
-
- r = base64mem(salted_pin, sizeof(salted_pin), &b64_salted_pin);
- if (r < 0)
- return log_error_errno(r, "Failed to base64 encode salted pin: %m");
- } else
- /* no salting needed, backwards compat with non-salted pins */
- b64_salted_pin = TAKE_PTR(pin_str);
-
- r = tpm2_unseal(tpm2_context,
- hash_pcr_mask,
- pcr_bank,
- pubkey, pubkey_size,
- pubkey_pcr_mask,
- signature_json,
- b64_salted_pin,
- pcrlock_path ? &pcrlock_policy : NULL,
- primary_alg,
- blob,
- blob_size,
- policy_hash,
- policy_hash_size,
- srk_buf,
- srk_buf_size,
- ret_decrypted_key,
- ret_decrypted_key_size);
- if (r < 0) {
- log_error_errno(r, "Failed to unseal secret using TPM2: %m");
-
- /* We get this error in case there is an authentication policy mismatch. This should
- * not happen, but this avoids confusing behavior, just in case. */
- if (!IN_SET(r, -EPERM, -ENOLCK))
- continue;
- }
-
- return r;
- }
-}
-
-int find_tpm2_auto_data(
- struct crypt_device *cd,
- uint32_t search_pcr_mask,
- int start_token,
- uint32_t *ret_hash_pcr_mask,
- uint16_t *ret_pcr_bank,
- void **ret_pubkey,
- size_t *ret_pubkey_size,
- uint32_t *ret_pubkey_pcr_mask,
- uint16_t *ret_primary_alg,
- void **ret_blob,
- size_t *ret_blob_size,
- void **ret_policy_hash,
- size_t *ret_policy_hash_size,
- void **ret_salt,
- size_t *ret_salt_size,
- void **ret_srk_buf,
- size_t *ret_srk_buf_size,
- TPM2Flags *ret_flags,
- int *ret_keyslot,
- int *ret_token) {
-
- int r, token;
-
- assert(cd);
-
- for (token = start_token; token < sym_crypt_token_max(CRYPT_LUKS2); token++) {
- _cleanup_free_ void *blob = NULL, *policy_hash = NULL, *pubkey = NULL, *salt = NULL, *srk_buf = NULL;
- _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
- size_t blob_size, policy_hash_size, pubkey_size, salt_size = 0, srk_buf_size = 0;
- uint32_t hash_pcr_mask, pubkey_pcr_mask;
- uint16_t pcr_bank, primary_alg;
- TPM2Flags flags;
- int keyslot;
-
- r = cryptsetup_get_token_as_json(cd, token, "systemd-tpm2", &v);
- if (IN_SET(r, -ENOENT, -EINVAL, -EMEDIUMTYPE))
- continue;
- if (r < 0)
- return log_error_errno(r, "Failed to read JSON token data off disk: %m");
-
- r = tpm2_parse_luks2_json(
- v,
- &keyslot,
- &hash_pcr_mask,
- &pcr_bank,
- &pubkey, &pubkey_size,
- &pubkey_pcr_mask,
- &primary_alg,
- &blob, &blob_size,
- &policy_hash, &policy_hash_size,
- &salt, &salt_size,
- &srk_buf, &srk_buf_size,
- &flags);
- if (r == -EUCLEAN) /* Gracefully handle issues in JSON fields not owned by us */
- continue;
- if (r < 0)
- return log_error_errno(r, "Failed to parse TPM2 JSON data: %m");
-
- if (search_pcr_mask == UINT32_MAX ||
- search_pcr_mask == hash_pcr_mask) {
-
- if (start_token <= 0)
- log_info("Automatically discovered security TPM2 token unlocks volume.");
-
- *ret_hash_pcr_mask = hash_pcr_mask;
- *ret_pcr_bank = pcr_bank;
- *ret_pubkey = TAKE_PTR(pubkey);
- *ret_pubkey_size = pubkey_size;
- *ret_pubkey_pcr_mask = pubkey_pcr_mask;
- *ret_primary_alg = primary_alg;
- *ret_blob = TAKE_PTR(blob);
- *ret_blob_size = blob_size;
- *ret_policy_hash = TAKE_PTR(policy_hash);
- *ret_policy_hash_size = policy_hash_size;
- *ret_salt = TAKE_PTR(salt);
- *ret_salt_size = salt_size;
- *ret_keyslot = keyslot;
- *ret_token = token;
- *ret_srk_buf = TAKE_PTR(srk_buf);
- *ret_srk_buf_size = srk_buf_size;
- *ret_flags = flags;
- return 0;
- }
-
- /* PCR mask doesn't match what is configured, ignore this entry, let's see next */
- }
-
- return log_error_errno(SYNTHETIC_ERRNO(ENXIO), "No valid TPM2 token data found.");
-}
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