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Proof-of-concept: Protect decrypted relation keys #446
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,168 @@ | ||
| #include "postgres.h" | ||
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||
| #include <openssl/crypto.h> | ||
| #include <openssl/err.h> | ||
| #include <openssl/rand.h> | ||
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| #include "utils/resowner.h" | ||
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| #include "encryption/enc_aes.h" | ||
| #include "encryption/tde_keys.h" | ||
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| #ifdef FRONTEND | ||
| #include "pg_tde_fe.h" | ||
| #endif | ||
|
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| static void ResourceOwnerReleaseDecryptedTdeKey(Datum resource); | ||
| static DecryptedTdeKey *tde_keys_alloc_decrypted_key(void); | ||
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| static const ResourceOwnerDesc tde_keys_resource_owner_desc = | ||
| { | ||
| .name = "pg_tde decrypted key", | ||
| .release_phase = RESOURCE_RELEASE_BEFORE_LOCKS, | ||
| .release_priority = RELEASE_PRIO_FIRST, | ||
| .ReleaseResource = ResourceOwnerReleaseDecryptedTdeKey, | ||
| .DebugPrint = NULL, | ||
| }; | ||
|
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| EncryptedTdeKey * | ||
| tde_keys_encrypt_key(const DecryptedTdeKey *decrypted_key, | ||
| const uint8 *encryption_key, | ||
| const uint8 *additional_authentication_data, | ||
| int additional_authentication_data_size) | ||
| { | ||
| EncryptedTdeKey *encrypted_key = palloc0_object(EncryptedTdeKey); | ||
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| memcpy(encrypted_key->key_iv, decrypted_key->iv, TDE_KEY_IV_SIZE); | ||
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| if (!RAND_bytes(encrypted_key->iv, TDE_KEY_ENCRYPTION_IV_SIZE)) | ||
| ereport(ERROR, | ||
| errmsg("could not generate iv for key encryption: %s", | ||
| ERR_error_string(ERR_get_error(), NULL))); | ||
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| AesGcmEncrypt(encryption_key, | ||
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| encrypted_key->iv, | ||
| TDE_KEY_ENCRYPTION_IV_SIZE, | ||
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| additional_authentication_data, | ||
| additional_authentication_data_size, | ||
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| decrypted_key->data, | ||
| TDE_KEY_SIZE, | ||
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| encrypted_key->key_data, | ||
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| encrypted_key->aead_tag, | ||
| TDE_KEY_ENCRYPTION_AEAD_TAG_SIZE); | ||
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| return encrypted_key; | ||
| } | ||
|
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| DecryptedTdeKey * | ||
| tde_keys_decrypt_key(EncryptedTdeKey *encrypted_key, | ||
| const uint8 *decryption_key, | ||
| const uint8 *additional_authentication_data, | ||
| int additional_authentication_data_size) | ||
| { | ||
| DecryptedTdeKey *decrypted_key; | ||
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| Assert(encrypted_key); | ||
| Assert(decryption_key); | ||
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| decrypted_key = tde_keys_alloc_decrypted_key(); | ||
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| if (!AesGcmDecrypt(decryption_key, | ||
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| encrypted_key->iv, | ||
| TDE_KEY_ENCRYPTION_IV_SIZE, | ||
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| additional_authentication_data, | ||
| additional_authentication_data_size, | ||
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| encrypted_key->key_data, | ||
| TDE_KEY_SIZE, | ||
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| decrypted_key->data, | ||
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| encrypted_key->aead_tag, | ||
| TDE_KEY_ENCRYPTION_AEAD_TAG_SIZE)) | ||
| { | ||
| tde_keys_free_decrypted_key(decrypted_key); | ||
| return NULL; | ||
| } | ||
|
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| memcpy(decrypted_key->iv, encrypted_key->key_iv, TDE_KEY_IV_SIZE); | ||
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| return decrypted_key; | ||
| } | ||
|
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| void | ||
| tde_keys_free_decrypted_key(DecryptedTdeKey *decrypted_key) | ||
| { | ||
| Assert(decrypted_key->owner); | ||
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| ResourceOwnerForget(decrypted_key->owner, | ||
| PointerGetDatum(decrypted_key), | ||
| &tde_keys_resource_owner_desc); | ||
| OPENSSL_secure_clear_free(decrypted_key, sizeof(DecryptedTdeKey)); | ||
| } | ||
|
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| DecryptedTdeKey * | ||
| tde_keys_generate_decrypted_key(void) | ||
| { | ||
| DecryptedTdeKey *decrypted_key = tde_keys_alloc_decrypted_key(); | ||
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| if (!RAND_bytes(decrypted_key->data, TDE_KEY_SIZE)) | ||
| ereport(ERROR, | ||
| errmsg("could not generate key: %s", | ||
| ERR_error_string(ERR_get_error(), NULL))); | ||
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| if (!RAND_bytes(decrypted_key->iv, TDE_KEY_IV_SIZE)) | ||
| ereport(ERROR, | ||
| errmsg("could not generate iv: %s", | ||
| ERR_error_string(ERR_get_error(), NULL))); | ||
|
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| return decrypted_key; | ||
| } | ||
|
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| static void | ||
| ResourceOwnerReleaseDecryptedTdeKey(Datum resource) | ||
| { | ||
| OPENSSL_secure_clear_free(DatumGetPointer(resource), sizeof(DecryptedTdeKey)); | ||
| } | ||
|
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| static DecryptedTdeKey * | ||
| tde_keys_alloc_decrypted_key(void) | ||
| { | ||
| DecryptedTdeKey *decrypted_key; | ||
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| ResourceOwnerEnlarge(CurrentResourceOwner); | ||
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| decrypted_key = OPENSSL_secure_zalloc(sizeof(DecryptedTdeKey)); | ||
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| decrypted_key->owner = CurrentResourceOwner; | ||
| ResourceOwnerRemember(decrypted_key->owner, | ||
| PointerGetDatum(decrypted_key), | ||
| &tde_keys_resource_owner_desc); | ||
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| return decrypted_key; | ||
| } | ||
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| EncryptedTdeKey * | ||
| tde_keys_new_encrypted_key(const uint8 *encryption_key, | ||
| const uint8 *additional_authentication_data, | ||
| int additional_authentication_data_size) | ||
| { | ||
| DecryptedTdeKey *decrypted_key; | ||
| EncryptedTdeKey *encrypted_key; | ||
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| decrypted_key = tde_keys_generate_decrypted_key(); | ||
| encrypted_key = tde_keys_encrypt_key(decrypted_key, | ||
| encryption_key, | ||
| additional_authentication_data, | ||
| additional_authentication_data_size); | ||
| tde_keys_free_decrypted_key(decrypted_key); | ||
|
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| return encrypted_key; | ||
| } |
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The change to
uint8seems very arbitrary. Doesn't PostgreSQL useunsigned chareverywhere for this?There was a problem hiding this comment.
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That said I prefer
uint8overunsigned char, but that is not what I think we or PostgreSQL are using. So now you introduced a new way. Also it does seem you have not changedAesGcmDecrypt.There was a problem hiding this comment.
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The changes in pg_tde_tdemap.c was just to support the way I calculated aad in the other file, so that rotations wouldn't break everything. They are very PoC.
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The postgres code uses
uint8about as commonly asunsigned char. I picked the one I like :D. The type wasn't the point there at all but instead to use the full rlocator as aad.For WAL keys we currently use a fake rlocator that's the same for all of them so they need something else (probably start_lsn).
EDIT: excluding
contrib/unsigned charseems to be used about 66% of the time.