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-rw-r--r--src/cryptenroll/cryptenroll-tpm2.c28
-rw-r--r--src/cryptsetup/cryptsetup-tokens/cryptsetup-token-systemd-tpm2.c15
-rw-r--r--src/cryptsetup/cryptsetup-tokens/luks2-tpm2.c21
-rw-r--r--src/cryptsetup/cryptsetup-tokens/luks2-tpm2.h2
-rw-r--r--src/cryptsetup/cryptsetup-tpm2.c31
-rw-r--r--src/cryptsetup/cryptsetup-tpm2.h8
-rw-r--r--src/cryptsetup/cryptsetup.c7
-rw-r--r--src/partition/repart.c1
-rw-r--r--src/shared/tpm2-util.c80
-rw-r--r--src/shared/tpm2-util.h11
-rw-r--r--src/test/test-tpm2.c41
11 files changed, 230 insertions, 15 deletions
diff --git a/src/cryptenroll/cryptenroll-tpm2.c b/src/cryptenroll/cryptenroll-tpm2.c
index 96d5fc0695..3098b2e7ac 100644
--- a/src/cryptenroll/cryptenroll-tpm2.c
+++ b/src/cryptenroll/cryptenroll-tpm2.c
@@ -8,6 +8,8 @@
#include "hexdecoct.h"
#include "json.h"
#include "memory-util.h"
+#include "random-util.h"
+#include "sha256.h"
#include "tpm2-util.h"
static int search_policy_hash(
@@ -148,6 +150,14 @@ int enroll_tpm2(struct crypt_device *cd,
ssize_t base64_encoded_size;
int r, keyslot;
TPM2Flags flags = 0;
+ uint8_t binary_salt[SHA256_DIGEST_SIZE] = {};
+ /*
+ * erase the salt, we'd rather attempt to not have this in a coredump
+ * as an attacker would have all the parameters but pin used to create
+ * the session key. This problem goes away when we move to a trusted
+ * primary key, aka the SRK.
+ */
+ CLEANUP_ERASE(binary_salt);
assert(cd);
assert(volume_key);
@@ -161,6 +171,22 @@ int enroll_tpm2(struct crypt_device *cd,
r = get_pin(&pin_str, &flags);
if (r < 0)
return r;
+
+ r = crypto_random_bytes(binary_salt, sizeof(binary_salt));
+ if (r < 0)
+ return log_error_errno(r, "Failed to acquire random salt: %m");
+
+ uint8_t salted_pin[SHA256_DIGEST_SIZE] = {};
+ CLEANUP_ERASE(salted_pin);
+ r = tpm2_util_pbkdf2_hmac_sha256(pin_str, strlen(pin_str), binary_salt, sizeof(binary_salt), salted_pin);
+ if (r < 0)
+ return log_error_errno(r, "Failed to perform PBKDF2: %m");
+
+ pin_str = erase_and_free(pin_str);
+ /* re-stringify pin_str */
+ base64_encoded_size = base64mem(salted_pin, sizeof(salted_pin), &pin_str);
+ if (base64_encoded_size < 0)
+ return log_error_errno(base64_encoded_size, "Failed to base64 encode salted pin: %m");
}
r = tpm2_load_pcr_public_key(pubkey_path, &pubkey, &pubkey_size);
@@ -258,6 +284,8 @@ int enroll_tpm2(struct crypt_device *cd,
primary_alg,
blob, blob_size,
hash, hash_size,
+ use_pin ? binary_salt : NULL,
+ use_pin ? sizeof(binary_salt) : 0,
flags,
&v);
if (r < 0)
diff --git a/src/cryptsetup/cryptsetup-tokens/cryptsetup-token-systemd-tpm2.c b/src/cryptsetup/cryptsetup-tokens/cryptsetup-token-systemd-tpm2.c
index 1eb924529c..dd379169ff 100644
--- a/src/cryptsetup/cryptsetup-tokens/cryptsetup-token-systemd-tpm2.c
+++ b/src/cryptsetup/cryptsetup-tokens/cryptsetup-token-systemd-tpm2.c
@@ -42,8 +42,8 @@ _public_ int cryptsetup_token_open_pin(
void *usrptr /* plugin defined parameter passed to crypt_activate_by_token*() API */) {
_cleanup_(erase_and_freep) char *base64_encoded = NULL, *pin_string = NULL;
- _cleanup_free_ void *blob = NULL, *pubkey = NULL, *policy_hash = NULL;
- size_t blob_size, policy_hash_size, decrypted_key_size, pubkey_size;
+ _cleanup_free_ void *blob = NULL, *pubkey = NULL, *policy_hash = NULL, *salt = NULL;
+ size_t blob_size, policy_hash_size, decrypted_key_size, pubkey_size, salt_size = 0;
_cleanup_(erase_and_freep) void *decrypted_key = NULL;
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
uint32_t hash_pcr_mask, pubkey_pcr_mask;
@@ -90,6 +90,8 @@ _public_ int cryptsetup_token_open_pin(
&blob_size,
&policy_hash,
&policy_hash_size,
+ &salt,
+ &salt_size,
&flags);
if (r < 0)
return log_debug_open_error(cd, r);
@@ -110,6 +112,8 @@ _public_ int cryptsetup_token_open_pin(
blob_size,
policy_hash,
policy_hash_size,
+ salt,
+ salt_size,
flags,
&decrypted_key,
&decrypted_key_size);
@@ -168,9 +172,9 @@ _public_ void cryptsetup_token_dump(
const char *json /* validated 'systemd-tpm2' token if cryptsetup_token_validate is defined */) {
_cleanup_free_ char *hash_pcrs_str = NULL, *pubkey_pcrs_str = NULL, *blob_str = NULL, *policy_hash_str = NULL, *pubkey_str = NULL;
- _cleanup_free_ void *blob = NULL, *pubkey = NULL, *policy_hash = NULL;
+ _cleanup_free_ void *blob = NULL, *pubkey = NULL, *policy_hash = NULL, *salt = NULL;
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
- size_t blob_size, policy_hash_size, pubkey_size;
+ size_t blob_size, policy_hash_size, pubkey_size, salt_size = 0;
uint32_t hash_pcr_mask, pubkey_pcr_mask;
uint16_t pcr_bank, primary_alg;
TPM2Flags flags = 0;
@@ -195,6 +199,8 @@ _public_ void cryptsetup_token_dump(
&blob_size,
&policy_hash,
&policy_hash_size,
+ &salt,
+ &salt_size,
&flags);
if (r < 0)
return (void) crypt_log_debug_errno(cd, r, "Failed to parse " TOKEN_NAME " JSON fields: %m");
@@ -227,6 +233,7 @@ _public_ void cryptsetup_token_dump(
crypt_log(cd, "\ttpm2-blob: %s\n", blob_str);
crypt_log(cd, "\ttpm2-policy-hash:" CRYPT_DUMP_LINE_SEP "%s\n", policy_hash_str);
crypt_log(cd, "\ttpm2-pin: %s\n", true_false(flags & TPM2_FLAGS_USE_PIN));
+ crypt_log(cd, "\ttpm2-salt: %s\n", true_false(salt));
}
/*
diff --git a/src/cryptsetup/cryptsetup-tokens/luks2-tpm2.c b/src/cryptsetup/cryptsetup-tokens/luks2-tpm2.c
index be496d4949..80a2c0d316 100644
--- a/src/cryptsetup/cryptsetup-tokens/luks2-tpm2.c
+++ b/src/cryptsetup/cryptsetup-tokens/luks2-tpm2.c
@@ -9,6 +9,7 @@
#include "luks2-tpm2.h"
#include "parse-util.h"
#include "random-util.h"
+#include "sha256.h"
#include "strv.h"
#include "tpm2-util.h"
@@ -26,12 +27,15 @@ int acquire_luks2_key(
size_t key_data_size,
const void *policy_hash,
size_t policy_hash_size,
+ const void *salt,
+ size_t salt_size,
TPM2Flags flags,
void **ret_decrypted_key,
size_t *ret_decrypted_key_size) {
_cleanup_(json_variant_unrefp) JsonVariant *signature_json = NULL;
_cleanup_free_ char *auto_device = NULL;
+ _cleanup_(erase_and_freep) char *b64_salted_pin = NULL;
int r;
assert(ret_decrypted_key);
@@ -50,6 +54,23 @@ int acquire_luks2_key(
if ((flags & TPM2_FLAGS_USE_PIN) && !pin)
return -ENOANO;
+ /* If we're using a PIN, and the luks header has a salt, it better have a pin too */
+ if ((flags & TPM2_FLAGS_USE_PIN) && salt && !pin)
+ return -ENOANO;
+
+ if (pin) {
+ uint8_t salted_pin[SHA256_DIGEST_SIZE] = {};
+ CLEANUP_ERASE(salted_pin);
+ r = tpm2_util_pbkdf2_hmac_sha256(pin, strlen(pin), 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");
+ pin = b64_salted_pin;
+ }
+
if (pubkey_pcr_mask != 0) {
r = tpm2_load_pcr_signature(signature_path, &signature_json);
if (r < 0)
diff --git a/src/cryptsetup/cryptsetup-tokens/luks2-tpm2.h b/src/cryptsetup/cryptsetup-tokens/luks2-tpm2.h
index f3625124e5..36d514caa0 100644
--- a/src/cryptsetup/cryptsetup-tokens/luks2-tpm2.h
+++ b/src/cryptsetup/cryptsetup-tokens/luks2-tpm2.h
@@ -20,6 +20,8 @@ int acquire_luks2_key(
size_t key_data_size,
const void *policy_hash,
size_t policy_hash_size,
+ const void *salt,
+ size_t salt_size,
TPM2Flags flags,
void **ret_decrypted_key,
size_t *ret_decrypted_key_size);
diff --git a/src/cryptsetup/cryptsetup-tpm2.c b/src/cryptsetup/cryptsetup-tpm2.c
index 838c02bfc9..2a8a38c593 100644
--- a/src/cryptsetup/cryptsetup-tpm2.c
+++ b/src/cryptsetup/cryptsetup-tpm2.c
@@ -9,6 +9,7 @@
#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) {
@@ -69,6 +70,8 @@ int acquire_tpm2_key(
size_t key_data_size,
const void *policy_hash,
size_t policy_hash_size,
+ const void *salt,
+ size_t salt_size,
TPM2Flags flags,
usec_t until,
bool headless,
@@ -140,7 +143,7 @@ int acquire_tpm2_key(
ret_decrypted_key_size);
for (int i = 5;; i--) {
- _cleanup_(erase_and_freep) char *pin_str = NULL;
+ _cleanup_(erase_and_freep) char *pin_str = NULL, *b64_salted_pin = NULL;
if (i <= 0)
return -EACCES;
@@ -149,13 +152,28 @@ int acquire_tpm2_key(
if (r < 0)
return r;
+ if (salt) {
+ 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(device,
hash_pcr_mask,
pcr_bank,
pubkey, pubkey_size,
pubkey_pcr_mask,
signature_json,
- pin_str,
+ b64_salted_pin,
primary_alg,
blob,
blob_size,
@@ -188,6 +206,8 @@ int find_tpm2_auto_data(
size_t *ret_blob_size,
void **ret_policy_hash,
size_t *ret_policy_hash_size,
+ void **ret_salt,
+ size_t *ret_salt_size,
TPM2Flags *ret_flags,
int *ret_keyslot,
int *ret_token) {
@@ -197,9 +217,9 @@ int find_tpm2_auto_data(
assert(cd);
for (token = start_token; token < sym_crypt_token_max(CRYPT_LUKS2); token++) {
- _cleanup_free_ void *blob = NULL, *policy_hash = NULL, *pubkey = NULL;
+ _cleanup_free_ void *blob = NULL, *policy_hash = NULL, *pubkey = NULL, *salt = NULL;
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
- size_t blob_size, policy_hash_size, pubkey_size;
+ size_t blob_size, policy_hash_size, pubkey_size, salt_size = 0;
uint32_t hash_pcr_mask, pubkey_pcr_mask;
uint16_t pcr_bank, primary_alg;
TPM2Flags flags;
@@ -221,6 +241,7 @@ int find_tpm2_auto_data(
&primary_alg,
&blob, &blob_size,
&policy_hash, &policy_hash_size,
+ &salt, &salt_size,
&flags);
if (r == -EUCLEAN) /* Gracefully handle issues in JSON fields not owned by us */
continue;
@@ -243,6 +264,8 @@ int find_tpm2_auto_data(
*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_flags = flags;
diff --git a/src/cryptsetup/cryptsetup-tpm2.h b/src/cryptsetup/cryptsetup-tpm2.h
index a34eb8443d..f6549b7d1d 100644
--- a/src/cryptsetup/cryptsetup-tpm2.h
+++ b/src/cryptsetup/cryptsetup-tpm2.h
@@ -28,6 +28,8 @@ int acquire_tpm2_key(
size_t key_data_size,
const void *policy_hash,
size_t policy_hash_size,
+ const void *salt,
+ size_t salt_size,
TPM2Flags flags,
usec_t until,
bool headless,
@@ -49,6 +51,8 @@ int find_tpm2_auto_data(
size_t *ret_blob_size,
void **ret_policy_hash,
size_t *ret_policy_hash_size,
+ void **ret_salt,
+ size_t *ret_salt_size,
TPM2Flags *ret_flags,
int *ret_keyslot,
int *ret_token);
@@ -72,6 +76,8 @@ static inline int acquire_tpm2_key(
size_t key_data_size,
const void *policy_hash,
size_t policy_hash_size,
+ const void *salt,
+ size_t salt_size,
TPM2Flags flags,
usec_t until,
bool headless,
@@ -97,6 +103,8 @@ static inline int find_tpm2_auto_data(
size_t *ret_blob_size,
void **ret_policy_hash,
size_t *ret_policy_hash_size,
+ void **ret_salt,
+ size_t *ret_salt_size,
TPM2Flags *ret_flags,
int *ret_keyslot,
int *ret_token) {
diff --git a/src/cryptsetup/cryptsetup.c b/src/cryptsetup/cryptsetup.c
index 2c9d416734..d40fe7bfad 100644
--- a/src/cryptsetup/cryptsetup.c
+++ b/src/cryptsetup/cryptsetup.c
@@ -1658,6 +1658,7 @@ static int attach_luks_or_plain_or_bitlk_by_tpm2(
key_file, arg_keyfile_size, arg_keyfile_offset,
key_data, key_data_size,
/* policy_hash= */ NULL, /* policy_hash_size= */ 0, /* we don't know the policy hash */
+ /* salt= */ NULL, /* salt_size= */ 0,
arg_tpm2_pin ? TPM2_FLAGS_USE_PIN : 0,
until,
arg_headless,
@@ -1703,8 +1704,8 @@ static int attach_luks_or_plain_or_bitlk_by_tpm2(
* works. */
for (;;) {
- _cleanup_free_ void *pubkey = NULL;
- size_t pubkey_size = 0;
+ _cleanup_free_ void *pubkey = NULL, *salt = NULL;
+ size_t pubkey_size = 0, salt_size = 0;
uint32_t hash_pcr_mask, pubkey_pcr_mask;
uint16_t pcr_bank, primary_alg;
TPM2Flags tpm2_flags;
@@ -1720,6 +1721,7 @@ static int attach_luks_or_plain_or_bitlk_by_tpm2(
&primary_alg,
&blob, &blob_size,
&policy_hash, &policy_hash_size,
+ &salt, &salt_size,
&tpm2_flags,
&keyslot,
&token);
@@ -1749,6 +1751,7 @@ static int attach_luks_or_plain_or_bitlk_by_tpm2(
/* key_file= */ NULL, /* key_file_size= */ 0, /* key_file_offset= */ 0, /* no key file */
blob, blob_size,
policy_hash, policy_hash_size,
+ salt, salt_size,
tpm2_flags,
until,
arg_headless,
diff --git a/src/partition/repart.c b/src/partition/repart.c
index 586a5edd2d..7c4a1ee01c 100644
--- a/src/partition/repart.c
+++ b/src/partition/repart.c
@@ -3390,6 +3390,7 @@ static int partition_encrypt(Context *context, Partition *p, const char *node) {
primary_alg,
blob, blob_size,
hash, hash_size,
+ NULL, 0, /* no salt because tpm2_seal has no pin */
0,
&v);
if (r < 0)
diff --git a/src/shared/tpm2-util.c b/src/shared/tpm2-util.c
index af62f03b0f..3870f0401b 100644
--- a/src/shared/tpm2-util.c
+++ b/src/shared/tpm2-util.c
@@ -12,6 +12,7 @@
#include "format-table.h"
#include "fs-util.h"
#include "hexdecoct.h"
+#include "hmac.h"
#include "memory-util.h"
#include "openssl-util.h"
#include "parse-util.h"
@@ -2110,6 +2111,8 @@ int tpm2_make_luks2_json(
size_t blob_size,
const void *policy_hash,
size_t policy_hash_size,
+ const void *salt,
+ size_t salt_size,
TPM2Flags flags,
JsonVariant **ret) {
@@ -2149,7 +2152,8 @@ int tpm2_make_luks2_json(
JSON_BUILD_PAIR("tpm2-policy-hash", JSON_BUILD_HEX(policy_hash, policy_hash_size)),
JSON_BUILD_PAIR("tpm2-pin", JSON_BUILD_BOOLEAN(flags & TPM2_FLAGS_USE_PIN)),
JSON_BUILD_PAIR_CONDITION(pubkey_pcr_mask != 0, "tpm2_pubkey_pcrs", JSON_BUILD_VARIANT(pkmj)),
- JSON_BUILD_PAIR_CONDITION(pubkey_pcr_mask != 0, "tpm2_pubkey", JSON_BUILD_BASE64(pubkey, pubkey_size))));
+ JSON_BUILD_PAIR_CONDITION(pubkey_pcr_mask != 0, "tpm2_pubkey", JSON_BUILD_BASE64(pubkey, pubkey_size)),
+ JSON_BUILD_PAIR_CONDITION(salt, "tpm2_salt", JSON_BUILD_BASE64(salt, salt_size))));
if (r < 0)
return r;
@@ -2172,10 +2176,12 @@ int tpm2_parse_luks2_json(
size_t *ret_blob_size,
void **ret_policy_hash,
size_t *ret_policy_hash_size,
+ void **ret_salt,
+ size_t *ret_salt_size,
TPM2Flags *ret_flags) {
- _cleanup_free_ void *blob = NULL, *policy_hash = NULL, *pubkey = NULL;
- size_t blob_size = 0, policy_hash_size = 0, pubkey_size = 0;
+ _cleanup_free_ void *blob = NULL, *policy_hash = NULL, *pubkey = NULL, *salt = NULL;
+ size_t blob_size = 0, policy_hash_size = 0, pubkey_size = 0, salt_size = 0;
uint32_t hash_pcr_mask = 0, pubkey_pcr_mask = 0;
uint16_t primary_alg = TPM2_ALG_ECC; /* ECC was the only supported algorithm in systemd < 250, use that as implied default, for compatibility */
uint16_t pcr_bank = UINT16_MAX; /* default: pick automatically */
@@ -2260,6 +2266,13 @@ int tpm2_parse_luks2_json(
SET_FLAG(flags, TPM2_FLAGS_USE_PIN, json_variant_boolean(w));
}
+ w = json_variant_by_key(v, "tpm2_salt");
+ if (w) {
+ r = json_variant_unbase64(w, &salt, &salt_size);
+ if (r < 0)
+ return log_debug_errno(r, "Invalid base64 data in 'tpm2_salt' field.");
+ }
+
w = json_variant_by_key(v, "tpm2_pubkey_pcrs");
if (w) {
r = tpm2_parse_pcr_json_array(w, &pubkey_pcr_mask);
@@ -2297,6 +2310,10 @@ int tpm2_parse_luks2_json(
*ret_policy_hash = TAKE_PTR(policy_hash);
if (ret_policy_hash_size)
*ret_policy_hash_size = policy_hash_size;
+ if (ret_salt)
+ *ret_salt = TAKE_PTR(salt);
+ if (ret_salt_size)
+ *ret_salt_size = salt_size;
if (ret_flags)
*ret_flags = flags;
@@ -2461,3 +2478,60 @@ int pcr_mask_to_string(uint32_t mask, char **ret) {
*ret = TAKE_PTR(buf);
return 0;
}
+
+#define PBKDF2_HMAC_SHA256_ITERATIONS 10000
+
+/*
+ * Implements PBKDF2 HMAC SHA256 for a derived keylen of 32
+ * bytes and for PBKDF2_HMAC_SHA256_ITERATIONS count.
+ * I found the wikipedia entry relevant and it contains links to
+ * relevant RFCs:
+ * - https://en.wikipedia.org/wiki/PBKDF2
+ * - https://www.rfc-editor.org/rfc/rfc2898#section-5.2
+ */
+int tpm2_util_pbkdf2_hmac_sha256(const void *pass,
+ size_t passlen,
+ const void *salt,
+ size_t saltlen,
+ uint8_t ret_key[static SHA256_DIGEST_SIZE]) {
+
+ uint8_t _cleanup_(erase_and_freep) *buffer = NULL;
+ uint8_t u[SHA256_DIGEST_SIZE];
+
+ /* To keep this simple, since derived KeyLen (dkLen in docs)
+ * Is the same as the hash output, we don't need multiple
+ * blocks. Part of the algorithm is to add the block count
+ * in, but this can be hardcoded to 1.
+ */
+ static const uint8_t block_cnt[] = { 0, 0, 0, 1 };
+
+ assert (saltlen > 0);
+ assert (saltlen <= (SIZE_MAX - sizeof(block_cnt)));
+ assert (passlen > 0);
+
+ /*
+ * Build a buffer of salt + block_cnt and hmac_sha256 it we
+ * do this as we don't have a context builder for HMAC_SHA256.
+ */
+ buffer = malloc(saltlen + sizeof(block_cnt));
+ if (!buffer)
+ return -ENOMEM;
+
+ memcpy(buffer, salt, saltlen);
+ memcpy(&buffer[saltlen], block_cnt, sizeof(block_cnt));
+
+ hmac_sha256(pass, passlen, buffer, saltlen + sizeof(block_cnt), u);
+
+ /* dk needs to be an unmodified u as u gets modified in the loop */
+ memcpy(ret_key, u, SHA256_DIGEST_SIZE);
+ uint8_t *dk = ret_key;
+
+ for (size_t i = 1; i < PBKDF2_HMAC_SHA256_ITERATIONS; i++) {
+ hmac_sha256(pass, passlen, u, sizeof(u), u);
+
+ for (size_t j=0; j < sizeof(u); j++)
+ dk[j] ^= u[j];
+ }
+
+ return 0;
+}
diff --git a/src/shared/tpm2-util.h b/src/shared/tpm2-util.h
index 96e6c31b0a..04efd78638 100644
--- a/src/shared/tpm2-util.h
+++ b/src/shared/tpm2-util.h
@@ -5,6 +5,7 @@
#include "json.h"
#include "macro.h"
+#include "sha256.h"
typedef enum TPM2Flags {
TPM2_FLAGS_USE_PIN = 1 << 0,
@@ -87,8 +88,8 @@ int tpm2_parse_pcrs(const char *s, uint32_t *ret);
int tpm2_make_pcr_json_array(uint32_t pcr_mask, JsonVariant **ret);
int tpm2_parse_pcr_json_array(JsonVariant *v, uint32_t *ret);
-int tpm2_make_luks2_json(int keyslot, uint32_t hash_pcr_mask, uint16_t pcr_bank, const void *pubkey, size_t pubkey_size, uint32_t pubkey_pcr_mask, uint16_t primary_alg, const void *blob, size_t blob_size, const void *policy_hash, size_t policy_hash_size, TPM2Flags flags, JsonVariant **ret);
-int tpm2_parse_luks2_json(JsonVariant *v, int *ret_keyslot, 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, TPM2Flags *ret_flags);
+int tpm2_make_luks2_json(int keyslot, uint32_t hash_pcr_mask, uint16_t pcr_bank, const void *pubkey, size_t pubkey_size, uint32_t pubkey_pcr_mask, uint16_t primary_alg, const void *blob, size_t blob_size, const void *policy_hash, size_t policy_hash_size, const void *salt, size_t salt_size, TPM2Flags flags, JsonVariant **ret);
+int tpm2_parse_luks2_json(JsonVariant *v, int *ret_keyslot, 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, TPM2Flags *ret_flags);
#define TPM2_PCRS_MAX 24U
@@ -156,3 +157,9 @@ int tpm2_load_pcr_signature(const char *path, JsonVariant **ret);
int tpm2_load_pcr_public_key(const char *path, void **ret_pubkey, size_t *ret_pubkey_size);
int pcr_mask_to_string(uint32_t mask, char **ret);
+
+int tpm2_util_pbkdf2_hmac_sha256(const void *pass,
+ size_t passlen,
+ const void *salt,
+ size_t saltlen,
+ uint8_t res[static SHA256_DIGEST_SIZE]);
diff --git a/src/test/test-tpm2.c b/src/test/test-tpm2.c
index c5f3d41da9..04e08490b3 100644
--- a/src/test/test-tpm2.c
+++ b/src/test/test-tpm2.c
@@ -28,4 +28,45 @@ TEST(tpm2_parse_pcrs) {
test_tpm2_parse_pcrs_one("foo", 0, -EINVAL);
}
+TEST(tpm2_util_pbkdf2_hmac_sha256) {
+
+ /*
+ * The test vectors from RFC 6070 [1] are for dkLen of 20 as it's SHA1
+ * other RFCs I bumped into had various differing dkLen and iter counts,
+ * so this was generated using Python's hmacmodule.
+ *
+ * 1. https://www.rfc-editor.org/rfc/rfc6070.html#page-2
+ */
+ static const struct {
+ const uint8_t pass[256];
+ size_t passlen;
+ const uint8_t salt[256];
+ size_t saltlen;
+ uint8_t expected[SHA256_DIGEST_SIZE];
+ } test_vectors[] = {
+ { .pass={'f', 'o', 'o', 'p', 'a', 's', 's'}, .passlen=7, .salt={'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5'}, .saltlen=16, .expected={0xCB, 0xEA, 0x27, 0x23, 0x9A, 0x65, 0x99, 0xF6, 0x8C, 0x26, 0x54, 0x80, 0x5C, 0x63, 0x61, 0xD2, 0x91, 0x0A, 0x60, 0x3F, 0xC2, 0xF5, 0xF0, 0xAB, 0x55, 0x8B, 0x46, 0x07, 0x60, 0x93, 0xAB, 0xCB} },
+ { .pass={'f', 'o', 'o', 'p', 'a', 's', 's'}, .passlen=7, .salt={0x00, 'h', 'f', 's', 'd', 'j', 'h', 'f', 'd', 'j', 'h', 'j', 'd', 'f', 's'}, .saltlen=15, .expected={0x2B, 0xDF, 0x52, 0x29, 0x48, 0x3F, 0x98, 0x25, 0x01, 0x19, 0xB4, 0x42, 0xBC, 0xA7, 0x38, 0x5D, 0xCD, 0x08, 0xBD, 0xDC, 0x33, 0xBF, 0x32, 0x5E, 0x31, 0x87, 0x54, 0xFF, 0x2C, 0x23, 0x68, 0xFF} },
+ { .pass={'f', 'o', 'o', 'p', 'a', 's', 's'}, .passlen=7, .salt={'m', 'y', 's', 'a', 0x00, 'l', 't'}, .saltlen=7, .expected={0x7C, 0x24, 0xB4, 0x4D, 0x30, 0x11, 0x53, 0x24, 0x87, 0x56, 0x24, 0x10, 0xBA, 0x9F, 0xF2, 0x4E, 0xBB, 0xF5, 0x03, 0x56, 0x2B, 0xB1, 0xA1, 0x92, 0x8B, 0x5F, 0x32, 0x02, 0x23, 0x1F, 0x79, 0xE6} },
+ { .pass={'p', 'a', 's', 's', 'w', 'i', 't', 'h', 'n', 'u', 'l', 'l', 0x00, 'p', 'a', 's', 's', 'w', 'o', 'r', 'd'}, .passlen=21, .salt={'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5'}, .saltlen=16, .expected={0xE9, 0x53, 0xB7, 0x1D, 0xAB, 0xD1, 0xC1, 0xF3, 0xC4, 0x7F, 0x18, 0x96, 0xDD, 0xD7, 0x6B, 0xC6, 0x6A, 0xBD, 0xFB, 0x12, 0x7C, 0xF8, 0x68, 0xDC, 0x6E, 0xEF, 0x29, 0xCC, 0x1B, 0x30, 0x5B, 0x74} },
+ { .pass={'p', 'a', 's', 's', 'w', 'i', 't', 'h', 'n', 'u', 'l', 'l', 0x00, 'p', 'a', 's', 's', 'w', 'o', 'r', 'd'}, .passlen=21, .salt={0x00, 'h', 'f', 's', 'd', 'j', 'h', 'f', 'd', 'j', 'h', 'j', 'd', 'f', 's'}, .saltlen=15, .expected={0x51, 0xA3, 0x82, 0xA5, 0x2F, 0x48, 0x84, 0xB3, 0x02, 0x0D, 0xC2, 0x42, 0x9A, 0x8F, 0x86, 0xCC, 0x66, 0xFD, 0x65, 0x87, 0x89, 0x07, 0x2B, 0x07, 0x82, 0x42, 0xD6, 0x6D, 0x43, 0xB8, 0xFD, 0xCF} },
+ { .pass={'p', 'a', 's', 's', 'w', 'i', 't', 'h', 'n', 'u', 'l', 'l', 0x00, 'p', 'a', 's', 's', 'w', 'o', 'r', 'd'}, .passlen=21, .salt={'m', 'y', 's', 'a', 0x00, 'l', 't'}, .saltlen=7, .expected={0xEC, 0xFB, 0x5D, 0x5F, 0xF6, 0xA6, 0xE0, 0x79, 0x50, 0x64, 0x36, 0x64, 0xA3, 0x9A, 0x5C, 0xF3, 0x7A, 0x87, 0x0B, 0x64, 0x51, 0x59, 0x75, 0x64, 0x8B, 0x78, 0x2B, 0x62, 0x8F, 0x68, 0xD9, 0xCC} },
+ { .pass={0x00, 'p', 'a', 's', 's'}, .passlen=5, .salt={'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5'}, .saltlen=16, .expected={0x8A, 0x9A, 0x47, 0x9A, 0x91, 0x22, 0x2F, 0x56, 0x29, 0x4F, 0x26, 0x00, 0xE7, 0xB3, 0xEB, 0x63, 0x6D, 0x51, 0xF2, 0x60, 0x17, 0x08, 0x20, 0x70, 0x82, 0x8F, 0xA3, 0xD7, 0xBE, 0x2B, 0xD5, 0x5D} },
+ { .pass={0x00, 'p', 'a', 's', 's'}, .passlen=5, .salt={0x00, 'h', 'f', 's', 'd', 'j', 'h', 'f', 'd', 'j', 'h', 'j', 'd', 'f', 's'}, .saltlen=15, .expected={0x72, 0x3A, 0xF5, 0xF7, 0xCD, 0x6C, 0x12, 0xDD, 0x53, 0x28, 0x46, 0x0C, 0x19, 0x0E, 0xF2, 0x91, 0xDE, 0xEA, 0xF9, 0x6F, 0x74, 0x32, 0x34, 0x3F, 0x84, 0xED, 0x8D, 0x2A, 0xDE, 0xC9, 0xC6, 0x34} },
+ { .pass={0x00, 'p', 'a', 's', 's'}, .passlen=5, .salt={'m', 'y', 's', 'a', 0x00, 'l', 't'}, .saltlen=7, .expected={0xE3, 0x07, 0x12, 0xBE, 0xEE, 0xF5, 0x5D, 0x18, 0x72, 0xF4, 0xCF, 0xF1, 0x20, 0x6B, 0xD6, 0x66, 0xCD, 0x7C, 0xE7, 0x4F, 0xC2, 0x16, 0x70, 0x5B, 0x9B, 0x2F, 0x7D, 0xE2, 0x3B, 0x42, 0x3A, 0x1B} },
+ };
+
+ uint8_t res[SHA256_DIGEST_SIZE];
+ for(size_t i = 0; i < sizeof(test_vectors)/sizeof(test_vectors[0]); i++) {
+
+ int rc = tpm2_util_pbkdf2_hmac_sha256(
+ test_vectors[i].pass,
+ test_vectors[i].passlen,
+ test_vectors[i].salt,
+ test_vectors[i].saltlen,
+ res);
+ assert_se(rc == 0);
+ assert_se(memcmp(test_vectors[i].expected, res, SHA256_DIGEST_SIZE) == 0);
+ }
+}
+
DEFINE_TEST_MAIN(LOG_DEBUG);
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