Bump sshd-core from 2.0.0 to 2.7.0 in /oda-subsystems/sshserver

[dependabot]

Bumps sshd-core from 2.0.0 to 2.7.0.

Changelog

Sourced from sshd-core's changelog.

Version 2.6.0 to 2.7.0

Version 2.7.0 to 2.8.0

Planned for next version

Major code re-factoring

Potential compatibility issues

Changes that may affect existing code

A new SFTP configuration property has been introduced that limits the maximum amount of data that can be sent in a single SSH_FXP_WRITE packet - default=256KB

    /**
     * Force the use of a max. packet length for {@link AbstractSftpSubsystemHelper#doWrite(Buffer, int)} protection
     * against malicious packets
     */
    public static final Property<Integer> MAX_WRITE_DATA_PACKET_LENGTH
            = Property.integer("sftp-max-writedata-packet-length", 256 * 1024);

This might cause SFTP write failures for clients that might have sent larger buffers and they have been accepted so far. If this happens, simply increase this value (though the choice of 256KB should be compatible with the vast majority of clients).

SSH channel identifiers have been changed to use long instead of int in order to align them with the standard that required them to be UINT32 values.

The relevant API(s) have been modified accordingly - which may cause a few incompatibility issues with code that extends/implements existing Channel classes and interfaces. In this context, the Channel interface now extends ChannelIdentifier where getId() has been renamed to getChannelId()

long used instead of int in most encoded/decoded packets that are specified as being UINT32

There are several exceptions to this rule:

• The SFTP packet id field - an "opaque" value anyway, not used for allocation or indexing anyway

• Various flags and mask field - there is no reason to encapsulate them into a long value since they do not represent a cardinal number of 32 bits

• Various status code fields - ditto.

• Cases where the value serves as argument for allocation of other data structures based on its value - e.g., arrays, lists. This was done for convenience reasons since Java does not support unsigned array/list sizes. In such cases, special validation code was applied to make sure the requested value does not exceed Integer#MAX_VALUE (sometimes even less) in order to protect the code from malicious or malformed packets. It is important to bear in mind that in the vast majority of the cases we do not want to be able to allocate arrays or lists having billions of elements as it would almost definitely cause out-of-memory issues.

Minor code helpers

Behavioral changes and enhancements

... (truncated)

Commits

• 2772c7c [maven-release-plugin] prepare release sshd-2.7.0
• c5500e9 Add changelog for 2.7.0
• 9a724be [SSHD-525] Server side implementation of posix-rename@openssh.com
• 4dad0d7 [SSHD-1145] Deprecate ReflectionUtils#isClassAvailable and use ThreadUtils#re...
• db7cbdc [SSHD-1158] Don't send channel EOF after having received channel CLOSE
• 60b50f9 [SSHD-1141] DefaultClientKexExtensionHandler: ensure list is modifiable
• 797d887 Updated Netty version to 4.1.63
• 4bfeca3 Updated PMD version to 6.33.0
• f7a2ae3 Updated Checkstyle version to 8.41.1
• 0a3f5da Updated Spring Core version to 5.3.6
• Additional commits viewable in compare view

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