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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "alloc-util.h"
#include "ask-password-api.h"
#include "env-util.h"
#include "hexdecoct.h"
#include "json.h"
#include "log.h"
#include "luks2-tpm2.h"
#include "parse-util.h"
#include "random-util.h"
#include "strv.h"
#include "tpm2-util.h"
int acquire_luks2_key(
uint32_t pcr_mask,
uint16_t pcr_bank,
uint16_t primary_alg,
const char *device,
const void *key_data,
size_t key_data_size,
const void *policy_hash,
size_t policy_hash_size,
TPM2Flags flags,
const char *pin,
void **ret_decrypted_key,
size_t *ret_decrypted_key_size) {
_cleanup_free_ char *auto_device = NULL;
int r;
assert(ret_decrypted_key);
assert(ret_decrypted_key_size);
if (!device) {
r = tpm2_find_device_auto(LOG_DEBUG, &auto_device);
if (r == -ENODEV)
return -EAGAIN; /* Tell the caller to wait for a TPM2 device to show up */
if (r < 0)
return r;
device = auto_device;
}
if ((flags & TPM2_FLAGS_USE_PIN) && !pin)
return -ENOANO;
return tpm2_unseal(
device,
pcr_mask, pcr_bank,
primary_alg,
key_data, key_data_size,
policy_hash, policy_hash_size, pin,
ret_decrypted_key, ret_decrypted_key_size);
}
/* this function expects valid "systemd-tpm2" in json */
int parse_luks2_tpm2_data(
const char *json,
uint32_t search_pcr_mask,
uint32_t *ret_pcr_mask,
uint16_t *ret_pcr_bank,
uint16_t *ret_primary_alg,
char **ret_base64_blob,
char **ret_hex_policy_hash,
TPM2Flags *ret_flags) {
int r;
JsonVariant *w, *e;
uint32_t pcr_mask = 0;
uint16_t pcr_bank = UINT16_MAX, primary_alg = TPM2_ALG_ECC;
_cleanup_free_ char *base64_blob = NULL, *hex_policy_hash = NULL;
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
TPM2Flags flags = 0;
assert(json);
assert(ret_pcr_mask);
assert(ret_pcr_bank);
assert(ret_primary_alg);
assert(ret_base64_blob);
assert(ret_hex_policy_hash);
r = json_parse(json, 0, &v, NULL, NULL);
if (r < 0)
return -EINVAL;
w = json_variant_by_key(v, "tpm2-pcrs");
if (!w || !json_variant_is_array(w))
return -EINVAL;
JSON_VARIANT_ARRAY_FOREACH(e, w) {
uint64_t u;
if (!json_variant_is_number(e))
return -EINVAL;
u = json_variant_unsigned(e);
if (u >= TPM2_PCRS_MAX)
return -EINVAL;
pcr_mask |= UINT32_C(1) << u;
}
if (search_pcr_mask != UINT32_MAX &&
search_pcr_mask != pcr_mask)
return -ENXIO;
w = json_variant_by_key(v, "tpm2-pcr-bank");
if (w) {
/* The PCR bank field is optional */
if (!json_variant_is_string(w))
return -EINVAL;
r = tpm2_pcr_bank_from_string(json_variant_string(w));
if (r < 0)
return r;
pcr_bank = r;
}
w = json_variant_by_key(v, "tpm2-primary-alg");
if (w) {
/* The primary key algorithm is optional */
if (!json_variant_is_string(w))
return -EINVAL;
r = tpm2_primary_alg_from_string(json_variant_string(w));
if (r < 0)
return r;
primary_alg = r;
}
w = json_variant_by_key(v, "tpm2-blob");
if (!w || !json_variant_is_string(w))
return -EINVAL;
base64_blob = strdup(json_variant_string(w));
if (!base64_blob)
return -ENOMEM;
w = json_variant_by_key(v, "tpm2-policy-hash");
if (!w || !json_variant_is_string(w))
return -EINVAL;
hex_policy_hash = strdup(json_variant_string(w));
if (!hex_policy_hash)
return -ENOMEM;
w = json_variant_by_key(v, "tpm2-pin");
if (w) {
if (!json_variant_is_boolean(w))
return -EINVAL;
if (json_variant_boolean(w))
flags |= TPM2_FLAGS_USE_PIN;
}
*ret_pcr_mask = pcr_mask;
*ret_pcr_bank = pcr_bank;
*ret_primary_alg = primary_alg;
*ret_base64_blob = TAKE_PTR(base64_blob);
*ret_hex_policy_hash = TAKE_PTR(hex_policy_hash);
*ret_flags = flags;
return 0;
}
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