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cryptsetup: be more careful with erasing key material from memory

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This commit is contained in:
Lennart Poettering 2020-11-25 11:58:55 +01:00
parent 8414cd48e9
commit d3ad474f0c
1 changed files with 5 additions and 4 deletions
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9
src/cryptsetup/cryptsetup.c
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@ -468,7 +468,8 @@ static int get_password(
return log_oom();
strncpy(c, *p, arg_key_size);
free_and_replace(*p, c);
erase_and_free(*p);
*p = TAKE_PTR(c);
}
*ret = TAKE_PTR(passwords);
@ -486,7 +487,7 @@ static int attach_tcrypt(
uint32_t flags) {
int r = 0;
_cleanup_free_ char *passphrase = NULL;
_cleanup_(erase_and_freep) char *passphrase = NULL;
struct crypt_params_tcrypt params = {
.flags = CRYPT_TCRYPT_LEGACY_MODES,
.keyfiles = (const char **)arg_tcrypt_keyfiles,
@ -656,8 +657,8 @@ static int attach_luks_or_plain_or_bitlk(
if (arg_pkcs11_uri) {
_cleanup_(sd_device_monitor_unrefp) sd_device_monitor *monitor = NULL;
_cleanup_(erase_and_freep) void *decrypted_key = NULL;
_cleanup_(sd_event_unrefp) sd_event *event = NULL;
_cleanup_free_ void *decrypted_key = NULL;
_cleanup_free_ char *friendly = NULL;
size_t decrypted_key_size = 0;
@ -724,7 +725,7 @@ static int attach_luks_or_plain_or_bitlk(
if (pass_volume_key)
r = crypt_activate_by_volume_key(cd, name, decrypted_key, decrypted_key_size, flags);
else {
_cleanup_free_ char *base64_encoded = NULL;
_cleanup_(erase_and_freep) char *base64_encoded = NULL;
/* Before using this key as passphrase we base64 encode it. Why? For compatibility
* with homed's PKCS#11 hookup: there we want to use the key we acquired through