mirror of
https://github.com/koverstreet/bcachefs-tools.git
synced 2025-02-02 00:00:03 +03:00
2831b89a7c
Factor out bch2_pick_bucket_size() from the format code, and pick the bucket size before picking the superblock location - that way we can ensure the superblock gets its own bucket and doesn't trigger warnings due to the allocation code noticing different types of data in the same bucket.
148 lines
3.7 KiB
C
148 lines
3.7 KiB
C
#include <errno.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <termios.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <time.h>
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#include <unistd.h>
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#include <keyutils.h>
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#include <linux/random.h>
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#include <libscrypt.h>
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#include <uuid/uuid.h>
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#include "checksum.h"
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#include "crypto.h"
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char *read_passphrase(const char *prompt)
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{
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char *buf = NULL;
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size_t buflen = 0;
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ssize_t len;
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if (isatty(STDIN_FILENO)) {
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struct termios old, new;
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fprintf(stderr, "%s", prompt);
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fflush(stderr);
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if (tcgetattr(STDIN_FILENO, &old))
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die("error getting terminal attrs");
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new = old;
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new.c_lflag &= ~ECHO;
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &new))
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die("error setting terminal attrs");
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len = getline(&buf, &buflen, stdin);
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tcsetattr(STDIN_FILENO, TCSAFLUSH, &old);
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fprintf(stderr, "\n");
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} else {
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len = getline(&buf, &buflen, stdin);
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}
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if (len < 0)
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die("error reading passphrase");
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if (len && buf[len - 1] == '\n')
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buf[len - 1] = '\0';
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return buf;
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}
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void derive_passphrase(struct bch_sb_field_crypt *crypt,
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struct bch_key *key,
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const char *passphrase)
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{
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const unsigned char salt[] = "bcache";
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int ret;
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switch (BCH_CRYPT_KDF_TYPE(crypt)) {
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case BCH_KDF_SCRYPT:
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ret = libscrypt_scrypt((void *) passphrase, strlen(passphrase),
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salt, sizeof(salt),
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1ULL << BCH_KDF_SCRYPT_N(crypt),
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1ULL << BCH_KDF_SCRYPT_R(crypt),
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1ULL << BCH_KDF_SCRYPT_P(crypt),
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(void *) key, sizeof(*key));
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if (ret)
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die("scrypt error: %i", ret);
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break;
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default:
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die("unknown kdf type %llu", BCH_CRYPT_KDF_TYPE(crypt));
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}
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}
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void bch2_add_key(struct bch_sb *sb, const char *passphrase)
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{
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struct bch_sb_field_crypt *crypt = bch2_sb_get_crypt(sb);
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if (!crypt)
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die("filesystem is not encrypted");
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struct bch_encrypted_key sb_key = crypt->key;
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if (!bch2_key_is_encrypted(&sb_key))
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die("filesystem does not have encryption key");
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struct bch_key passphrase_key;
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derive_passphrase(crypt, &passphrase_key, passphrase);
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/* Check if the user supplied the correct passphrase: */
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if (bch2_chacha_encrypt_key(&passphrase_key, __bch2_sb_key_nonce(sb),
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&sb_key, sizeof(sb_key)))
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die("error encrypting key");
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if (bch2_key_is_encrypted(&sb_key))
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die("incorrect passphrase");
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char uuid[40];
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uuid_unparse_lower(sb->user_uuid.b, uuid);
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char *description = mprintf("bcachefs:%s", uuid);
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if (add_key("logon", description,
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&passphrase_key, sizeof(passphrase_key),
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KEY_SPEC_USER_KEYRING) < 0 ||
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add_key("user", description,
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&passphrase_key, sizeof(passphrase_key),
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KEY_SPEC_USER_KEYRING) < 0)
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die("add_key error: %s", strerror(errno));
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memzero_explicit(description, strlen(description));
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free(description);
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memzero_explicit(&passphrase_key, sizeof(passphrase_key));
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memzero_explicit(&sb_key, sizeof(sb_key));
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}
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void bch_sb_crypt_init(struct bch_sb *sb,
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struct bch_sb_field_crypt *crypt,
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const char *passphrase)
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{
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crypt->key.magic = BCH_KEY_MAGIC;
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get_random_bytes(&crypt->key.key, sizeof(crypt->key.key));
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if (passphrase) {
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struct bch_key passphrase_key;
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SET_BCH_CRYPT_KDF_TYPE(crypt, BCH_KDF_SCRYPT);
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SET_BCH_KDF_SCRYPT_N(crypt, ilog2(SCRYPT_N));
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SET_BCH_KDF_SCRYPT_R(crypt, ilog2(SCRYPT_r));
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SET_BCH_KDF_SCRYPT_P(crypt, ilog2(SCRYPT_p));
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derive_passphrase(crypt, &passphrase_key, passphrase);
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assert(!bch2_key_is_encrypted(&crypt->key));
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if (bch2_chacha_encrypt_key(&passphrase_key, __bch2_sb_key_nonce(sb),
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&crypt->key, sizeof(crypt->key)))
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die("error encrypting key");
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assert(bch2_key_is_encrypted(&crypt->key));
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memzero_explicit(&passphrase_key, sizeof(passphrase_key));
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}
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}
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