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Truncate ciphertext buffer to actual size during file encryption
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Co-authored-by: Alexey Rusakov <Kitsune-Ral@users.sf.net>
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Add function to check if e2ee is supported
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The ciphertext for AES CTR is exactly as large as the plaintext (not
necessarily a multiple of the blocksize!). By truncating the ciphertext,
we do not send bytes that will be decrypted to gibberish.
As a side node, we probably do not need to initialize the ciphertext
buffer larger than the plaintext size at all, but the OpenSSL docs are a
bit vague about that.
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Implement sending encrypted messages
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Co-authored-by: Alexey Rusakov <Kitsune-Ral@users.sf.net>
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Co-authored-by: Alexey Rusakov <Kitsune-Ral@users.sf.net>
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Co-authored-by: Alexey Rusakov <Kitsune-Ral@users.sf.net>
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[skip ci]
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Co-authored-by: Tobias Fella <9750016+TobiasFella@users.noreply.github.com>
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As mentioned in the commit introducing `Expected`, `QOlmExpected` is
simply an alias for `Expected<T, QOlmError>`. This simplifies quite
a few function signatures in `QOlm*` classes and collapses unwieldy
`std::holds_alternative<>`/`std::get<>` constructs into a neat
contextual bool cast and an invocation of `operator*` or
`value()`/`error()` accessors that don't need to specify the type.
While refactoring the code, I found a couple of cases of mismatching
`uint32_t` and `qint32_t` in return values; a couple of cases where
`decrypt()` returns `QString` which is in fact `QByteArray` (e.g., in
`QOlmSession::decrypt()`); there's a repetitive algorithm in
`Connection::Private::sessionDecryptPrekey()` and
`sessionDecryptGeneral()`
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There's no particular use in letting `QOlmError` out, only to confirm
that, well, `QOlmError` is just another form of no-match.
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Making Qt signals const is an impossible commitment - once the signal
is out, you can't control if any called slot will change the emitting
class or not. The code compiles but const-ness is not preserved.
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This is a minimal implementation along the lines of `std::expected<>`
introduced in C++23; once compilers catch up with C++23 support, it may
become simply a typedef of std::expected. There are no tests as yet; but
the following commits will introduce QOlmExpected that would replace
the current `std::variant<T, QOlmError>` pattern used throughout `QOlm*`
classes, automatically pulling Expected under the coverage of `QOlm*`
unit tests.
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Various fixes and cleanup
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Mainly driven by clang-tidy and SonarCloud warnings (sadly, SonarCloud
doesn't store historical reports so no link can be provided here).
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See https://github.com/matrix-org/matrix-spec/pull/1054.
# Conflicts:
# lib/events/callanswerevent.cpp
# lib/events/callanswerevent.h
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QCoreApplication::processEvents() is well-known to be a _wrong_ solution
to the unresponsive UI problem; despite that, connection.cpp has long
had that call to let UI update itself while processing bulky room
updates (mainly from the initial sync). This commit finally fixes this,
after an (admittedly rare) race condition has been hit, as follows:
0. Pre-requisite: quotest runs all the tests and is about to leave
the room; there's an ongoing sync request.
1. Quotest calls /leave
2. Sync returns, with the batch of _several_ rooms (that's important)
3. The above code handles the first room in the batch
4. processEvents() is called, just in time for the /leave response.
5. The /leave response handler in quotest ends up calling
Connection::logout() (processEvents() still hasn't returned).
6. Connection::logout() calls abandon() on the ongoing SyncJob,
pulling the rug from under onSyncSuccess()/consumeRoomData().
7. processEvents() returns and the above code proceeds to the next
room - only to find that the roomDataList (that is a ref to
a structure owned by SyncJob), is now pointing to garbage.
Morals of the story:
1. processEvents() effectively makes code multi-threaded: one flow is
suspended and another one may run _on the same data_. After the first
flow is resumed, it cannot make any assumptions regarding which data
the second flow touched and/or changed.
2. The library had quite a few cases of using &&-refs, avoiding even
move operations but also leaving ownership of the data with the
original producer (SyncJob). If the lifetime of that producer ends
too soon, those refs become dangling.
The fix makes two important things, respectively:
2. Ownership of room data is now transfered to the processing side,
the moment it is scheduled (see below), in the form of moving
into a lambda capture.
1. Instead of processEvents(), processing of room data is scheduled
via QMetaObject::invokeMethod(), uncoupling the moment when the
data was received in SyncJob from the moment they are processed
in Room::updateData() (and all the numerous signal-slots it calls).
Also: Room::baseStateLoaded now causes Connection::loadedRoomState, not
the other way round - this is more natural and doesn't need Connection
to keep firstTimeRooms map around.
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To streamline adding of simple getters of content parts.
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QPair is giving way to its STL counterpart, becoming its alias in Qt 6.
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