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Do not use real password when unlocking "fake" header on reecryption.

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If reencrypt removes encryption (or adds encryption to not yet encrypted system)
there is a temporary header using null (none) cipher.
We do not need to pass through password when unlocking these devices.
This commit is contained in:
Milan Broz
2015-07-02 08:18:44 +02:00
parent 0dc245401f
commit 6e82bdd9a5
1 changed files with 22 additions and 2 deletions
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24
src/cryptsetup_reencrypt.c
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@@ -391,10 +391,30 @@ static int open_log(struct reenc_ctx *rc)
static int activate_luks_headers(struct reenc_ctx *rc)
{
struct crypt_device *cd = NULL, *cd_new = NULL;
const char *pwd_old, *pwd_new, pwd_empty[] = "";
size_t pwd_old_len, pwd_new_len;
int r;
log_dbg("Activating LUKS devices from headers.");
/* Never use real password for empty header processing */
if (rc->reencrypt_mode == REENCRYPT) {
pwd_old = rc->p[rc->keyslot].password;
pwd_old_len = rc->p[rc->keyslot].passwordLen;
pwd_new = pwd_old;
pwd_new_len = pwd_old_len;
} else if (rc->reencrypt_mode == DECRYPT) {
pwd_old = rc->p[rc->keyslot].password;
pwd_old_len = rc->p[rc->keyslot].passwordLen;
pwd_new = pwd_empty;
pwd_new_len = 0;
} else if (rc->reencrypt_mode == ENCRYPT) {
pwd_old = pwd_empty;
pwd_old_len = 0;
pwd_new = rc->p[rc->keyslot].password;
pwd_new_len = rc->p[rc->keyslot].passwordLen;
}
if ((r = crypt_init(&cd, rc->header_file_org)) ||
(r = crypt_load(cd, CRYPT_LUKS1, NULL)) ||
(r = crypt_set_data_device(cd, rc->device)))
@@ -402,7 +422,7 @@ static int activate_luks_headers(struct reenc_ctx *rc)
log_verbose(_("Activating temporary device using old LUKS header.\n"));
if ((r = crypt_activate_by_passphrase(cd, rc->header_file_org,
opt_key_slot, rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen,
opt_key_slot, pwd_old, pwd_old_len,
CRYPT_ACTIVATE_READONLY|CRYPT_ACTIVATE_PRIVATE)) < 0)
goto out;
@@ -413,7 +433,7 @@ static int activate_luks_headers(struct reenc_ctx *rc)
log_verbose(_("Activating temporary device using new LUKS header.\n"));
if ((r = crypt_activate_by_passphrase(cd_new, rc->header_file_new,
opt_key_slot, rc->p[rc->keyslot].password, rc->p[rc->keyslot].passwordLen,
opt_key_slot, pwd_new, pwd_new_len,
CRYPT_ACTIVATE_SHARED|CRYPT_ACTIVATE_PRIVATE)) < 0)
goto out;
r = 0;