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Current implementation can allow tampering and the CTR->GCM exchange can
help to avoid it.
This commits also alters a behaviour where we moved ahead after failing
to decrypt a recovery document. IMHO we can't move ahead as this is a
fatal error.
Signed-off-by: Victor Shyba <victor1984@riseup.net>
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Integrated the secrets's JSON key that specifies ciphers into _crypto
and added optional GCM. Also added a test to check if both cipher types
can be imported.
Resolves: #8680
Signed-off-by: Victor Shyba <victor1984@riseup.net>
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Resolves: #8668 - client: substitute usage of CTR mode + HMAC by GCM
cipher mode
Signed-off-by: Victor Shyba <victor1984@riseup.net>
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Our magic value wasn't being used and were represented as a string.
Refactored it to a constant, increased it's size to 2 bytes and optimzed
is_symmetrically_encrypted to look for the magic and symmetrically
encrypted flag under base64 encoding. Most file types will use this
feature to help identifying themselves, so it got refactored to serve
the purpose it was created.
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Naming, interfaces and other details.
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AESWriter and HMACWriter are just applying hmac or aes into a flow of
data. Abstracted the application of those operations into a super class
and highlighted just the difference on each implementation.
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VerifiedEncryptor and VerifiedDecryptor are just a pipe and a fan-out.
This class provides both behaviors to two distinct writeable things.
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After adding the streaming decrypt, some classes were doing almost the
same thing. Unified them.
Also fixed some module level variables to upper case and some class name
to camel case.
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Some exceptions were missing a proper description and client_side_db.py
script wasn't capturing logs from Twisted.
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Unfortunately, if a doc finishes decryption before the previous one we
will still have an issue while inserting. This commits solves it by
adding the parse and decrypt inside of the semaphore.
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We are already doing this on encryption, now we can stream also from
decryption. This unblocks the reactor and will be valuable for blobs-io.
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We now encode preamble and ciphertext+hmac in two distinct payloads
separated by a space. This allows metadata to be extracted and used
before decoding the whole document.
It also introduces a single packer for packing and unpacking of data
instead of reads and writes. Downside: doc_id and rev are limited to 255
chars now.
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IV was being set during tests and this required some defensive coding to
avoid IV being set in production. This commits makes the test use the
generated IV and "hides" it using a read-only property to let it clear
this should never happen.
Also refactored out some parameters that are generated automatically to
reduce some lines of code and enhance readability.
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Also explaining how we are using Twisted's consumer interfaces.
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received docs makes no sense for a single request download, plus all its
comments and docstrings. Also updated docstrings for other methods.
The method that tests if sqlcipher is encrypted can return a db handle
that can be used right away. If we ignore it and reopen we can end up
with a lost open cursor.
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Batching is now decided on server side, so the code can be simplified.
Also, sync_db and other parameters were used to initialize encdecpool,
which is no longer supported.
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Document sending happens after encryption, so the last sent document
needs to be signalled after request end.
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We need to emit zmq status during doc prepare, which is called during
upload.
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Fixes setup.cfg, adding current exclude rules, simplified tox.ini to use
setup.cfg and fixed all.
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Also refactored tests and code to stop relying on old parameters which
included docs instead of get_doc calls.
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Giving the proper name to the function and arguments helps to make the
producer wizardry less magic.
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Code was complex and raised a flag during review.
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Asserts aren't a good solution for stream parsing, its cleaner to check
and raise in place. Also, asserts can be ignored.
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Will be removed when we have the proper tool to migrate data.
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This is supposed to be used only for temporary backwards compatibility,
while we develop a proper migration tool.
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A dict was used to store references for the synchronizers based on a
URL. This commit removes it as it doesnt make sense with current code.
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We aren't using leap.common.http implementation and we need specific
features from original Twisted Web Agent. This commit implements it on
HTTP Targer.
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Parsing from metadata we can store the total of docs and handle it for
the doc parser in order to be able to keep consistent events info.
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Some code were duplicated, got removed. Additional comments added for
documenting such a critical and complex part as a protocol.
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Both classes holds u1db error handling. Making DocStreamReceiver a
subclass reduces the error handling to a single place thus removing
duplicated code.
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Insertion is synchronous and blocks the reactor. That's a temporary
solution as we used to have on decpool.
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This allow different paths for raw data and metadata, avoiding
unnecessary json parsing.
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There was an if without an else on error handler that avoided handling
errors that falled back current logic. Added a generic one to the tail
so we dont miss it.
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1) enable HTTP 1.1 chunked upload on server
2) make the client sync.py generate a list of function calls instead of
a list of full docs
3) disable encryption pool
4) make the doc encryption a list of function calls
5) create a twisted protocol for sending
6) make a producer that calls the doc generation as necessary
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