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Analysis: -- InnoDB has n (>0) redo-log files. -- In the first page of redo-log there is 2 checkpoint records on fixed location (checkpoint is not encrypted) -- On every checkpoint record there is up to 5 crypt_keys containing the keys used for encryption/decryption -- On crash recovery we read all checkpoints on every file -- Recovery starts by reading from the latest checkpoint forward -- Problem is that latest checkpoint might not always contain the key we need to decrypt all the redo-log blocks (see MDEV-9422 for one example) -- Furthermore, there is no way to identify is the log block corrupted or encrypted For example checkpoint can contain following keys : write chk: 4 [ chk key ]: [ 5 1 ] [ 4 1 ] [ 3 1 ] [ 2 1 ] [ 1 1 ] so over time we could have a checkpoint write chk: 13 [ chk key ]: [ 14 1 ] [ 13 1 ] [ 12 1 ] [ 11 1 ] [ 10 1 ] killall -9 mysqld causes crash recovery and on crash recovery we read as many checkpoints as there is log files, e.g. read [ chk key ]: [ 13 1 ] [ 12 1 ] [ 11 1 ] [ 10 1 ] [ 9 1 ] read [ chk key ]: [ 14 1 ] [ 13 1 ] [ 12 1 ] [ 11 1 ] [ 10 1 ] [ 9 1 ] This is problematic, as we could still scan log blocks e.g. from checkpoint 4 and we do not know anymore the correct key. CRYPT INFO: for checkpoint 14 search 4 CRYPT INFO: for checkpoint 13 search 4 CRYPT INFO: for checkpoint 12 search 4 CRYPT INFO: for checkpoint 11 search 4 CRYPT INFO: for checkpoint 10 search 4 CRYPT INFO: for checkpoint 9 search 4 (NOTE: NOT FOUND) For every checkpoint, code generated a new encrypted key based on key from encryption plugin and random numbers. Only random numbers are stored on checkpoint. Fix: Generate only one key for every log file. If checkpoint contains only one key, use that key to encrypt/decrypt all log blocks. If checkpoint contains more than one key (this is case for databases created using MariaDB server version 10.1.0 - 10.1.12 if log encryption was used). If looked checkpoint_no is found from keys on checkpoint we use that key to decrypt the log block. For encryption we use always the first key. If the looked checkpoint_no is not found from keys on checkpoint we use the first key. Modified code also so that if log is not encrypted, we do not generate any empty keys. If we have a log block and no keys is found from checkpoint we assume that log block is unencrypted. Log corruption or missing keys is found by comparing log block checksums. If we have a keys but current log block checksum is correct we again assume log block to be unencrypted. This is because current implementation stores checksum only before encryption and new checksum after encryption but before disk write is not stored anywhere.
6 lines
249 B
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6 lines
249 B
Text
--innodb-encrypt-log=ON
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--plugin-load-add=$FILE_KEY_MANAGEMENT_SO
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--loose-file-key-management
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--loose-file-key-management-filename=$MYSQL_TEST_DIR/std_data/logkey.txt
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--file-key-management-encryption-algorithm=aes_cbc
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--innodb-buffer-pool-size=128M
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