David Handermann created NIFI-14720:
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Summary: Switch to Apache MINA SSHD for SFTP Processors
Key: NIFI-14720
URL: https://issues.apache.org/jira/browse/NIFI-14720
Project: Apache NiFi
Issue Type: Improvement
Components: Extensions
Reporter: David Handermann
Assignee: David Handermann
NiFi SFTP Processors have used the [SSHJ|https://github.com/hierynomus/sshj]
library for the last several years, following a migration from JSch. Although
SSHJ continues to receive regular maintenance, [Apache MINA
SSHD|https://mina.apache.org/sshd-project/] also provides robust and extensible
support for SSH and SFTP. NiFi has used MINA SSHD server components for unit
testing over several years. Moving from SSHJ to MINA SSHD reduces the
dependency maintenance surface for SFTP Processors while maintaining existing
capabilities.
The initial migration should retain existing Processor properties and
implementation structure built in the internal {{SFTPTransfer}} class. Tests
that mock particular SSHJ behavior should be removed or redesigned to make use
of SFTP interaction with MINA SSHD server components where necessary.
Some low-level features such as particular algorithm negotiation, or private
key formats like PuTTY, may require manual migration. Support for legacy cipher
or key negotiation algorithms may require deprecation. Further refinement of
algorithm selection should be considered separately.
Moving to MINA SSHD should provide a better foundation for considering future
changes, such as key management and connection reuse through a separate
Controller Service.
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