* fix "client not connected" after SFTP reconnect
if the server closes the session and the client reconnects,
this currently leads to a broken state because the session
is re-created, but the SFTP subsession is not and still
references the old session.
This causes all operations to fail with "client not connected" or
even throwing the "An established connection was aborted by the server."
exception of the old session.
Always re-create the SFTP subsession to fix this.
fixes#1474
* Dispose old session on reconnect
All of the finalizers in the library are no-ops, but their existence means that
when Dispose (and thus GC.SuppressFinalize) is not called, the objects' lifetimes
are extended unnecessarily while they are waiting to be finalized.
Co-authored-by: Wojciech Nagórski <wojtpl2@gmail.com>
* Use BouncyCastle ECDsa when runtime is Mono
* Falls back to use BouncyCastle if CngKey.Import throws NotImplementedException (in Mono)
* Take NETStandard into consideration
* Adjust some comments
* Change #if NETFRAEWORK to #if NET462 for CngKey
* Separate implementations
* Consolidate Ecdsa property and HashAlgorithm property
* Rename Import_Cng and Import_Bcl to Import; Rename Export_Cng and Export_Bcl to Export;
* Add comments
* refactor
* add host key tests
---------
Co-authored-by: Robert Hague <rh@johnstreetcapital.com>
Co-authored-by: Rob Hague <rob.hague00@gmail.com>
* [AesGcmCipher] Use BouncyCastle as a fallback if BCL does not support.
* Switch back to collection initializer
* Remove conditional compilation
* Throw SshConnectionException with Reason MacError when authentication tag mismatch
* Separate BCL and BouncyCastle implementation
* Update AesGcmCipher.BclImpl.cs
* Naming enhancement
* Remove empty line
* Disable S1199. See https://github.com/sshnet/SSH.NET/pull/1371#discussion_r1704293356
* Set InnerException when MAC error. Remove Message check.
* Store KeyParameter as private field
* Use GcmCipher.ProcessAadBytes to avoid the copy of associated data
* Move nonce to constructor to avoid creating AeadParameters each packet
* Use const int for tag size
---------
Co-authored-by: Wojciech Nagórski <wojtpl2@gmail.com>
These tests were presumably once shared with the old integration tests repo
but have since been sat doing nothing. This brings them into the unit tests
project.
Co-authored-by: Wojciech Nagórski <wojtpl2@gmail.com>
* Use System.Security.Cryptography for DSA
This is the analogue of the RSA change #1373 for DSA. This has a couple of caveats:
- The BCL supports only FIPS 186-compliant keys, that is, public (P, Q) lengths
of (512 <= P <= 1024, 160) for FIPS 186-1/186-2; and (2048, 256), (3072, 256)
for FIPS 186-3/186-4. The latter also specifies (2048, 224) but due to a quirk
in the Windows API, the BCL does not support Q values of length 224[^1].
- OpenSSH, based on the SSH spec, only supports (supported) Q values of length 160,
but appears to also work in non-FIPS-compliant cases such as in our integration
tests with a (2048, 160) host key. That test now fails and I changed that host key
to (1024, 160).
This basically means that (1024, 160) is the largest DSA key size supported by both
SSH.NET and OpenSSH. However, given that OpenSSH deprecated DSA in 2015[^2], and the
alternative that I have been considering is just to delete support for DSA in the
library, this change seems reasonable to me. I don't think we can justify keeping the
current handwritten code around.
I think we may still consider dropping DSA from the library, I just had this branch
laying around and figured I'd finish it off.
[^1]: https://github.com/dotnet/runtime/blob/fadd8313653f71abd0068c8bf914be88edb2c8d3/src/libraries/Common/src/System/Security/Cryptography/DSACng.ImportExport.cs#L259-L265
[^2]: https://www.openssh.com/txt/release-7.0
* Appease mono
* test experiment
* Revert "Appease mono"
This reverts commit 881eefe5e8.
* Use BCL ECDiffieHellman for KeyExchange (.NET 8.0 onward only)
* Add back an empty line
* Remove the BouncyCastle dependency when target .NET 8.0 onward.
* Run KeyExchangeAlgorithmTests for .NET 6.0
* Build Renci.SshNet.IntegrationTests.csproj for net6.0
* Update filter
* Add back BouncyCastle as fallback
* Add back the missing `SendMessage`
* Run ECDH KEX integration tests under .NET48
* Use SshNamedCurves instead of SecNamedCurves for BouncyCastle.
BCL supports both names. See https://github.com/dotnet/runtime/blob/main/src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/OidLookup.cs#L200-L202
* typo
* Fix build
* Use System.Security.Cryptography namespace if NET8_0_OR_GREATER;
Use one parameter constructor for class ECDomainParameters
* Separate BCL and BouncyCastle implementation
---------
Co-authored-by: Wojciech Nagórski <wojtpl2@gmail.com>
* GeneratePackageOnBuild
IncludeSymbols
* Add packages to artifacts
* Update src/Renci.SshNet/Renci.SshNet.csproj
Co-authored-by: Rob Hague <rob.hague00@gmail.com>
* Update Renci.SshNet.csproj
Co-authored-by: Rob Hague <rob.hague00@gmail.com>
* Delete build/nuget/SSH.NET.nuspec
* Delete SSH.NET.nuspec from .sln file
* Update Renci.SshNet.csproj
* Update build.proj
* init nbgv
* Include version.json in "Solution Items"
* Update Directory.Build.props
* define publicReleaseRefSpec
* update version.json
* update version.json
* set cloud build number
* fix https://github.com/sshnet/SSH.NET/issues/1292
* remove unexpected code format
* Delete version from csproj
* move nbgv from Directory.Build.props to Renci.SshNet.csproj as only this particular project needs versioning.
include package version in ThisAssembly and use nuget package version for the SSH client version. Since we define the precision of nuget package to "build", it has 3 digits. Nuget package version is unique which should be suffient.
* Use package from CI feed
* Bump version to 2024.0.1; Update version precision
* Some tweaks:
- Remove the "release" section. I don't think we will use that for now
- Remove the "cloudBuild" section. Changing the CI build number doesn't seem that useful
- In the "nugetPackageVersion" section:
- Remove "precision". It defaults to build
- Add "semVer"=2. This makes the package version e.g. 2024.1.1-prerelease.1 instead
of 2024.1.1-prerelease-0001
- In "assemblyVersion" change "precision" to revision. Doesn't seem to change anything, I
was just copying nbgv's setup: https://github.com/dotnet/Nerdbank.GitVersioning/blob/main/version.json
- Make sure there are no '-' in the softwareversion string (change the test to a regex)
* Revert unnecessary test changes; remove unnecessary tests
---------
Co-authored-by: Rob Hague <rob.hague00@gmail.com>
Co-authored-by: Robert Hague <rh@johnstreetcapital.com>
* Implements ChaCha20 cipher algorithm.
* Implements chacha20-poly1305@openssh.com
* Update Cipher.cs
* Update ChaCha20Poly1305Cipher.cs
* Note that the length of the concatenation of 'packet_length',
'padding_length', 'payload', and 'random padding' MUST be a multiple
of the cipher block size or 8, whichever is larger.
See https://www.rfc-editor.org/rfc/rfc4253#section-6
* Use Chaos.Nacl Poly1305Donna
* Fix build. Fix typo. Update README
* Update README.md
* Fix build
* Remove trailing whitespace
* Fix build
* Change to BouncyCastle
* Inherit from SymmetricCipher instead of StreamCipher since StreamCipher is deleted
* Resolve conflicts
* Move field to local variable
* Compute poly key stream once
* Update test/Renci.SshNet.IntegrationTests/CipherTests.cs
Co-authored-by: Rob Hague <rob.hague00@gmail.com>
* Fix build; Add net48 integration test in CI
---------
Co-authored-by: Rob Hague <rob.hague00@gmail.com>
Co-authored-by: Wojciech Nagórski <wojtpl2@gmail.com>
* Ed25519 is now based on BouncyCastle instead of Chaos.NaCl
* Generate PublicKey and fix NullReferenceException
* Rectify variable name
---------
Co-authored-by: Wojciech Nagórski <wojtpl2@gmail.com>
* Curve25519 KEX is now based on BouncyCastle instead of Chaos.NaCl
* Abstract SecureRandom
---------
Co-authored-by: Wojciech Nagórski <wojtpl2@gmail.com>
This drops some of the algorithms long-considered legacy/insecure.
The idea is both to improve the theoretical security of the library by not offering
these algorithms, and to improve the practical security of the library by not having
hand-written, barely tested crypto code.
The overarching goal is for the library to have minimal exposure to crypto
implementation, relying firstly on the .NET base libraries, and secondly on
third-party providers, such as BouncyCastle.
This change covers deleting the cipher algorithms arcfour, blowfish, twofish, cast.
It covers deleting the MD5-based and truncated HMAC algorithms.
These were all disabled in OpenSSH server (sshd) in 2014[^1]:
> sshd(8): The default set of ciphers and MACs has been altered to
> remove unsafe algorithms. In particular, CBC ciphers and arcfour*
> are disabled by default.
>
> The full set of algorithms remains available if configured
> explicitly via the Ciphers and MACs sshd_config options.
and in the client in 2016[^2]:
> This release disables a number of legacy cryptographic algorithms
> by default in ssh:
>
> * Several ciphers blowfish-cbc, cast128-cbc, all arcfour variants
> and the rijndael-cbc aliases for AES.
>
> * MD5-based and truncated HMAC algorithms.
>
> These algorithms are already disabled by default in sshd.
This change also drops PKCS5Padding, which is a line-for-line copy of PKCS7Padding,
and StreamCipher, which is now unused (and useless anyway).
[^1]: https://www.openssh.com/txt/release-6.7
[^2]: https://www.openssh.com/txt/release-7.2
Co-authored-by: Wojciech Nagórski <wojtpl2@gmail.com>
* Replace internal BouncyCastle with NuGet package
* fix NullReference in KeyExchangeECDH
for some reason d24fe2006f introduced
its own names here which (as far as I can see) were never part
of the original BouncyCastle.
Switched to the correct names.
* Update to BouncyCastle 2.3.1
* Update to BouncyCastle 2.4.0
* fix Conflict between Zlib class and BouncyCastle namespace
CA1724: The type name Zlib conflicts in whole or in part with the namespace name 'Org.BouncyCastle.Utilities.Zlib'. Change either name to eliminate the conflict.
We can't change either, so suppress the warning.
---------
Co-authored-by: Rob Hague <rob.hague00@gmail.com>
* Ref System.Memory for net462 and netstandard2.0.
Use System.Buffers.Binary.BinaryPrimitives instead of Renci.SshNet.Common.Pack
* Remove unnecessary `AsSpan()`
* Apply suggestions from code review
* that's what I get for being lazy
---------
Co-authored-by: Rob Hague <rob.hague00@gmail.com>
Co-authored-by: Robert Hague <rh@johnstreetcapital.com>
* Add SshCommand.ExecuteAsync
After the previous change (#1423), this basically entails swapping out the
IAsyncResult for a TaskCompletionSource and hooking up the cancellation/timeout
logic.
As with the prior Begin/End implementation, the initiation of the command
(SendExecRequest) happens synchronously, so there's a bit of room for improvement
there, but otherwise it is the Task-based async that we know and like.
I chose to make it void (Task)- returning instead of string like in the existing
overloads, so that OutputStream is not automatically consumed (and encoded as a
string) when that may not be desired. As in #650, I was initially considering
changing the other overloads to be void-returning as well, but decided that it was
not worth the break since most people will probably want to change over to
ExecuteAsync anyway.
* Update examples
---------
Co-authored-by: Wojciech Nagórski <wojtpl2@gmail.com>
The library currently performs a DNS lookup of the desired host, takes the first
returned IP address and connects to that. Instead, we can just pass the hostname
down to System.Net.Sockets which will do the right thing, potentially trying
multiple addresses if needed.
Co-authored-by: Wojciech Nagórski <wojtpl2@gmail.com>
* On SOCKS5 proxy:
The library always resolves the hostname to the IP. Some SOCKS5 proxies don't allow you to specify the IP, they want to resolve the hostname themselves.
The patch sends the proxy the same specified value, IP, or hostname.
* refactor
---------
Co-authored-by: Jordi Vaca <jjvaca@indra.es>
Co-authored-by: Rob Hague <rob.hague00@gmail.com>
* Updated NETCONF framing protocol detection to check both client & server capabilities
This fixes an issue where the NetConfSession would expect the
framing protocol to be used if ServerCapabilities contained 1.1,
however the server would actually be using the legacy protocol as
the client only advertises support for 1.0.
* fix NETCONF to comply with RFC6242 for framing protocol
* netcconf client - fix null ptr exception on dispose
* netcconf client - provide example usage in xml doc
* add comment
---------
Co-authored-by: Jason Larke <jason.larke@curtin.edu.au>
Co-authored-by: Todd Schavey <todd.schavey@ge.com>
Co-authored-by: Robert Hague <rh@johnstreetcapital.com>
Co-authored-by: Rob Hague <rob.hague00@gmail.com>
* Updated NETCONF framing protocol detection to check both client & server capabilities
This fixes an issue where the NetConfSession would expect the
framing protocol to be used if ServerCapabilities contained 1.1,
however the server would actually be using the legacy protocol as
the client only advertises support for 1.0.
* add comment
---------
Co-authored-by: Jason Larke <jason.larke@curtin.edu.au>
Co-authored-by: Rob Hague <rob.hague00@gmail.com>
* Support creating Shell(Stream) without PTY
Fixes https://github.com/sshnet/SSH.NET/issues/1418
* Add integration test for "PermitTTY no"
* Fix Integration Test
* Remove duplicate shell request
* Put common operations in a shared constructor. Update xml doc comments.
* Update comments and method overriding
* Update per code review
* Update integration tests
* Renaming
* Make `bufferSize` optional
* Try fix the test
* Update per code review
* try agian
* try again
* docs
* doc
---------
Co-authored-by: Rob Hague <rob.hague00@gmail.com>
Apply similar treatment to PipeStream as #1322 did to ShellStream
PipeStream now behaves much more Stream-like. In particular, it performs partial
reads (instead of blocking until a certain amount of data is available), blocks
until data is available (instead of returning 0 prematurely) and removes the
Stream-unlike properties `BlockLastReadBuffer` and `MaxBufferLength`.
Sadly I gave up trying to make a benchmark compatible with all the quirks of the
previous implementation, but a dumb throughput test (reading and writing simultaneously)
shows about 5.2GB/s with this implementation compared to 140MB/s previously.
Some cleanup of its usage in the library followed.
Co-authored-by: Wojciech Nagórski <wojtpl2@gmail.com>
* Enable nullable on NetConf/Scp/SshClient
* fix formatting
* improve directoryCounter check
* disable nullable warnings on old frameworks
since the libraries are missing a lot of nullable attributes
in the old frameworks, this causes a lot of false positive
nullable warnings.
Simply disable these warnings for old frameworks.
* Preparation to enforce formatting and style in CI
- enabled IDE0055 to enforce formatting on build
- disabled SA1137 and SA1025 because they are already
covered by IDE0055
- disabled SA1021 because it conflicts with csharp_space_after_cast
* Cleanup formatting and style on codebase
This commit has no manual changes, it is the result
of running "dotnet format whitespace" and "dotnet format style"
* new formatting fixes after merge
* appveyor: set git autocrlf
as suggested by sharwell to hopefully fix Windows CI.
* use autocrlf input
to hopefully fix Linux tests
* fix formatting
* use autocrlf input for Linux only
* set csharp_space_after_cast to false
* Revert SA1021 suppression
---------
Co-authored-by: Robert Hague <rh@johnstreetcapital.com>
- Update README to point to https://sshnet.github.io/SSH.NET rather than the CHM file
- Add a CONTRIBUTING.md with some how-tos
For https://sshnet.github.io/SSH.NET:
- Use the repo README as the landing page to keep them in sync
- Combine the API-per-TFM pages to just one "API" page
- Add a couple more examples
- Add a GitHub link in the header.
* Use BCL for RSA
* Restore benchmark (with quirks for old code)
* Fixup benchmark (remove compatibility with old code)
* cosmetic tweaks
* Add a regression test for #1388
* Fix SocketAsyncEventArgsAwaitable calling continuation multiple times
* Use Interlocked.Exchange
---------
Co-authored-by: Rob Hague <rob.hague00@gmail.com>
* Add timeouts when reading from sockets in Socks5Connector
* Add a Socks5 timeout test for a connection reply
---------
Co-authored-by: Wojciech Nagórski <wojtpl2@gmail.com>
Co-authored-by: Rob Hague <rob.hague00@gmail.com>
* Implement OpenSSH strict key exchange extension
* The pseudo-algorithm
is only valid in the initial SSH2_MSG_KEXINIT and MUST be ignored
if they are present in subsequent SSH2_MSG_KEXINIT packets.
* Only send strict kex pseudo algorithm for the first kex.
Strictly disable non-kex massages in strict kex mode.
* Unit tests for strict kex
* More unit tests
* More unit tests
* Correct file name
* Update SessionTest_ConnectingBase.cs
* More unit tests
* Delete SessionTest_Connecting_ServerSendsMaxIgnoreMessagesBeforeKexInit.cs
* Add a comment about throwing exception when inbound sequence number is about to wrap during init kex.
* Delete SessionTest_Connecting_ServerSendsDebugMessageAfterKexInit_NoStrictKex.cs
* Fix build
* Update test/Renci.SshNet.Tests/Classes/SessionTest_Connected.cs
---------
Co-authored-by: Rob Hague <rob.hague00@gmail.com>
mus65