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#include <errno.h>
#include <unistd.h>
#include <uuid/uuid.h>
#include "cmds.h"
#include "libbcachefs/checksum.h"
#include "crypto.h"
#include "libbcachefs.h"
static void unlock_usage(void)
{
puts("bcachefs unlock - unlock an encrypted filesystem so it can be mounted\n"
"Usage: bcachefs unlock [OPTION] device\n"
"\n"
"Options:\n"
" -c Check if a device is encrypted\n"
" -k (session|user|user_session)\n"
" Keyring to add to (default: user)\n"
" -h Display this help and exit\n"
"Report bugs to <linux-bcachefs@vger.kernel.org>");
}
int cmd_unlock(int argc, char *argv[])
{
const char *keyring = "user";
bool check = false;
int opt;
while ((opt = getopt(argc, argv, "ck:h")) != -1)
switch (opt) {
case 'c':
check = true;
break;
case 'k':
keyring = strdup(optarg);
break;
case 'h':
unlock_usage();
exit(EXIT_SUCCESS);
}
args_shift(optind);
char *dev = arg_pop();
if (!dev)
die("Please supply a device");
if (argc)
die("Too many arguments");
struct bch_opts opts = bch2_opts_empty();
opt_set(opts, noexcl, true);
opt_set(opts, nochanges, true);
struct bch_sb_handle sb;
int ret = bch2_read_super(dev, &opts, &sb);
if (ret)
die("Error opening %s: %s", dev, bch2_err_str(ret));
if (!bch2_sb_is_encrypted(sb.sb))
die("%s is not encrypted", dev);
if (check)
exit(EXIT_SUCCESS);
char *passphrase = read_passphrase("Enter passphrase: ");
bch2_add_key(sb.sb, "user", keyring, passphrase);
bch2_free_super(&sb);
memzero_explicit(passphrase, strlen(passphrase));
free(passphrase);
return 0;
}
int cmd_set_passphrase(int argc, char *argv[])
{
struct bch_opts opts = bch2_opts_empty();
struct bch_fs *c;
if (argc < 2)
die("Please supply one or more devices");
opt_set(opts, nostart, true);
/*
* we use bch2_fs_open() here, instead of just reading the superblock,
* to make sure we're opening and updating every component device:
*/
c = bch2_fs_open(argv + 1, argc - 1, opts);
if (IS_ERR(c))
die("Error opening %s: %s", argv[1], bch2_err_str(PTR_ERR(c)));
struct bch_sb_field_crypt *crypt = bch2_sb_field_get(c->disk_sb.sb, crypt);
if (!crypt)
die("Filesystem does not have encryption enabled");
struct bch_encrypted_key new_key;
new_key.magic = BCH_KEY_MAGIC;
int ret = bch2_decrypt_sb_key(c, crypt, &new_key.key);
if (ret)
die("Error getting current key");
char *new_passphrase = read_passphrase_twice("Enter new passphrase: ");
struct bch_key passphrase_key = derive_passphrase(crypt, new_passphrase);
if (bch2_chacha_encrypt_key(&passphrase_key, __bch2_sb_key_nonce(c->disk_sb.sb),
&new_key, sizeof(new_key)))
die("error encrypting key");
crypt->key = new_key;
bch2_revoke_key(c->disk_sb.sb);
bch2_write_super(c);
bch2_fs_stop(c);
return 0;
}
int cmd_remove_passphrase(int argc, char *argv[])
{
struct bch_opts opts = bch2_opts_empty();
struct bch_fs *c;
if (argc < 2)
die("Please supply one or more devices");
opt_set(opts, nostart, true);
c = bch2_fs_open(argv + 1, argc - 1, opts);
if (IS_ERR(c))
die("Error opening %s: %s", argv[1], bch2_err_str(PTR_ERR(c)));
struct bch_sb_field_crypt *crypt = bch2_sb_field_get(c->disk_sb.sb, crypt);
if (!crypt)
die("Filesystem does not have encryption enabled");
struct bch_encrypted_key new_key;
new_key.magic = BCH_KEY_MAGIC;
int ret = bch2_decrypt_sb_key(c, crypt, &new_key.key);
if (ret)
die("Error getting current key");
crypt->key = new_key;
bch2_write_super(c);
bch2_fs_stop(c);
return 0;
}
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