## Issue:
This is an approach to fixing secret connection that is more noise-ish than actually noise.
but it essentially fixes the problem that #3315 is trying to solve by making the secret connection handshake non-malleable. It's easy to understand and I think will be acceptable to @jaekwon
.. the formal reasoning is basically, if the "view" of the transcript between diverges between the sender and the receiver at any point in the protocol, the handshake would terminate.
The base protocol of Station to Station mistakenly assumes that if the sender and receiver arrive at shared secret they have the same view. This is only true for a DH on prime order groups.
This robustly solves the problem by having each cryptographic operation commit to operators view of the protocol.
Another nice thing about a transcript is it provides the basis for "secure" (barring cryptographic breakages, horrible design flaws, or implementation bugs) downgrades, where a backwards compatible handshake can be used to offer newer protocol features/extensions, peers agree to the common subset of what they support, and both sides have to agree on what the other offered for the transcript MAC to verify.
With something like Protos/Amino you already get "extensions" for free (TLS uses a simple TLV format https://tools.ietf.org/html/rfc8446#section-4.2 for extensions not too far off from Protos/Amino), so as long as you cryptographically commit to what they contain in the transcript, it should be possible to extend the protocol in a backwards-compatible manner.
## Commits:
* Minimal changes to remove malleability of secret connection removes the need to check for lower order points.
Breaks compatibility. Secret connections that have no been updated will fail
* Remove the redundant blacklist
* remove remainders of blacklist in tests to make the code compile again
Signed-off-by: Ismail Khoffi <Ismail.Khoffi@gmail.com>
* Apply suggestions from code review
Apply Ismail's error handling
Co-Authored-By: Ismail Khoffi <Ismail.Khoffi@gmail.com>
* fix error check for io.ReadFull
Signed-off-by: Ismail Khoffi <Ismail.Khoffi@gmail.com>
* Update p2p/conn/secret_connection.go
Co-Authored-By: Ismail Khoffi <Ismail.Khoffi@gmail.com>
* Update p2p/conn/secret_connection.go
Co-Authored-By: Bot from GolangCI <42910462+golangcibot@users.noreply.github.com>
* update changelog and format the code
* move hkdfInit closer to where it's used
* Fix long line errors in abci, crypto, and libs packages
* Fix long lines in p2p and rpc packages
* Fix long lines in abci, state, and tools packages
* Fix long lines in behaviour and blockchain packages
* Fix long lines in cmd and config packages
* Begin fixing long lines in consensus package
* Finish fixing long lines in consensus package
* Add lll exclusion for lines containing URLs
* Fix long lines in crypto package
* Fix long lines in evidence package
* Fix long lines in mempool and node packages
* Fix long lines in libs package
* Fix long lines in lite package
* Fix new long line in node package
* Fix long lines in p2p package
* Ignore gocritic warning
* Fix long lines in privval package
* Fix long lines in rpc package
* Fix long lines in scripts package
* Fix long lines in state package
* Fix long lines in tools package
* Fix long lines in types package
* Enable lll linter
* Pin range scope vars
* Don't disable scopelint
This PR repairs linter errors seen when running the following commands:
golangci-lint run --no-config --disable-all=true --enable=scopelint
Contributes to #3262
* Remove unnecessary type conversions
* Consolidate repeated strings into consts
* Clothe return statements
* Update blockchain/v1/reactor_fsm_test.go
Co-Authored-By: Anton Kaliaev <anton.kalyaev@gmail.com>
This PR repairs linter errors seen when running the following commands:
golangci-lint run --no-config --disable-all=true --enable=unconvert
golangci-lint run --no-config --disable-all=true --enable=goconst
golangci-lint run --no-config --disable-all=true --enable=nakedret
Contributes to #3262
* init of (2/2) common errors
* Remove instances of cmn.Error (2/2)
- Replace usage of cmnError and errorWrap
- ref #3862
Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>
* comment wording
* simplify IsErrXXX functions
* log panic along with stopping the MConnection
* p2p: fix false-positive error logging when stopping connections
This changeset fixes two types of false-positive errors occurring during
connection shutdown.
The first occurs when the process invokes FlushStop() or Stop() on a
connection. While the previous behavior did properly wait for the sendRoutine
to finish, it did not notify the recvRoutine that the connection was shutting
down. This would cause the recvRouting to receive and error when reading and
log this error. The changeset fixes this by notifying the recvRoutine that
the connection is shutting down.
The second occurs when the connection is terminated (gracefully) by the other side.
The recvRoutine would get an EOF error during the read, log it, and stop the connection
with an error. The changeset detects EOF and gracefully shuts down the connection.
* bring back the comment about flushing
* add changelog entry
* listen for quitRecvRoutine too
* we have to call stopForError
Otherwise peer won't be removed from the peer set and maybe readded
later.
cleanup to add linter
grpc change:
https://godoc.org/google.golang.org/grpc#WithContextDialerhttps://godoc.org/google.golang.org/grpc#WithDialer
grpc/grpc-go#2627
prometheous change:
due to UninstrumentedHandler, being deprecated in the future
empty branch = empty if or else statement
didn't delete them entirely but commented
couldn't find a reason to have them
could not replicate the issue #3406
but if want to keep it commented then we should comment out the if statement as well
* Renamed wire.go to codec.go
- Wire was the previous name of amino
- Codec describes the file better than `wire` & `amino`
Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>
* ide error
* rename amino.go to codec.go
* Remove deprecated PanicXXX functions from codebase
As per discussion over
[here](https://github.com/tendermint/tendermint/pull/3456#discussion_r278423492),
we need to remove these `PanicXXX` functions and eliminate our
dependence on them. In this PR, each and every `PanicXXX` function call
is replaced with a simple `panic` call.
* add a changelog entry
* p2p: refactor Switch#Broadcast func
- call wg.Add only once
- do not call peers.List twice!
* bad for perfomance
* peers list can change in between calls!
Refs #3306
* p2p: use time.Ticker instead of RepeatTimer
no need in RepeatTimer since we don't Reset them
Refs #3306
* libs/common: remove RepeatTimer (also TimerMaker and Ticker interface)
"ancient code that’s caused no end of trouble" Ethan
I believe there's much simplier way to write a ticker than can be reset
https://medium.com/@arpith/resetting-a-ticker-in-go-63858a2c17ec
Refs #3262
This fixes two small bugs:
1) lite/dbprovider: return `ok` instead of true in parse* functions. It's weird that we're ignoring `ok` value before.
2) consensus/state: previously because of the shadowing we almost never output "Error with msg". Now we declare both `added` and `err` in the beginning of the function, so there's no shadowing.
* reject the shared secret if is all zeros in case the blacklist was not
sufficient
* Add test that verifies lower order pub-keys are rejected at the DH step
* Update changelog
* fix typo in test-comment
* p2p/conn: fix deadlock in FlushStop/OnStop
* makefile: set_with_deadlock
* close doneSendRoutine at end of sendRoutine
* conn: initialize channs in OnStart
> Implement a check for the blacklisted low order points, ala the X25519 has_small_order() function in libsodium
(#3010 (comment))
resolves first half of #3010
* crypto: revert to mainline Go crypto lib
We used to use a fork for a modified bcrypt so we could pass our own
randomness but this was largely unecessary, unused, and a burden.
So now we just use the mainline Go crypto lib.
* changelog
* fix tests
* version and changelog
Fixes#2715
In crawlPeersRoutine, which is performed when seedMode is run, there is
logic that disconnects the peer's state information at 3-hour intervals
through the duration value. The duration value is calculated by
referring to the created value of MConnection. When MConnection is
created for the first time, the created value is not initiated, so it is
not disconnected every 3 hours but every time it is disconnected. So,
normal nodes are connected to seedNode and disconnected immediately, so
address exchange does not work properly.
https://github.com/tendermint/tendermint/blob/master/p2p/pex/pex_reactor.go#L629
This point is not work correctly.
I think,
https://github.com/tendermint/tendermint/blob/master/p2p/conn/connection.go#L148
created variable is missing the current time setting.
* p2p/conn: FlushStop. Use in pex. Closes#2092
In seed mode, we call StopPeer immediately after Send.
Since flushing msgs to the peer happens in the background,
the peer connection is often closed before the messages are
actually sent out. The new FlushStop method allows all msgs
to first be written and flushed out on the conn before it is closed.
* fix dummy peer
* typo
* fixes from review
* more comments
* ensure pex doesn't call FlushStop more than once
FlushStop is not safe to call more than once,
but we call it from Receive in a go-routine so Receive
doesn't block.
To ensure we only call it once, we use the lastReceivedRequests
map - if an entry already exists, then FlushStop should already have
been called and we can return.
* Disable transitioning to new round upon 2/3+ of Precommit nils
Pull in ensureVote test function from https://github.com/tendermint/tendermint/pull/2132
* Add several ensureX test methods to wrap channel read with timeout
* Revert panic in tests
* update secret connection to use a little endian encoded nonce
* update encoding of chunk length to be little endian, too
* update comment
* Change comment slightly to trigger circelci
This now uses one hkdf on the X25519 shared secret to create
a key for the sender and receiver.
The hkdf call is now just called upon the computed shared
secret, since the shared secret is a function of the pubkeys.
The nonces now start at 0, as we are using chacha as a stream
cipher, and the sender and receiver now have different keys.
Generate keys with HKDF instead of hash functions, which provides better security properties.
Add xchacha20poly1305 to secret connection. (Due to rebasing, this code has been removed)
Currently the top level directory contains basically all of the code
for the crypto package. This PR moves the crypto code into submodules
in a similar manner to what `golang/x/crypto` does. This improves code
organization.
Ref discussion: https://github.com/tendermint/tendermint/pull/1966Closes#1956
except now we calculate the max size using the maxPacketMsgSize()
function, which frees developers from having to know amino encoding
details.
plus, 10 additional bytes are added to leave the room for amino upgrades
(both making it more efficient / less efficient)
Anton Kaliaev
Zaki Manian
Phil Salant
Zaki Manian
Marko
zjubfd
Ivan Kushmantsev
Thane Thomson
Ismail Khoffi
Ethan Buchman
Zarko Milosevic
Matthew Slipper
Dev Ojha
ValarDragon
Zach Ramsay