Replace use of SSH2 PHP extension with phpseclib

[DivineOmega]

Instead of using the SSH2 PHP extension, we should use the phpseclib native SSH implementation.

[peter279k]

Using the phpseclib advantage is as follows:

• We don't have to install additional ssh2 extension to create the SSH connection.

[DivineOmega]

@peter279k Exactly. One of the main benefits.

It's also not currently possible to get the SSH2 PHP extension installed correctly on Travis, so testing has to be done locally at the moment. This would be mitigated it the extension was not required.

[peter279k]

Thanks for your reply. I think it is possible to build the SSH2 extension in Travis CI build. Here is the setting file. https://github.com/thephpleague/shunt/blob/master/.travis.yml Jordan Hall <notifications@github.com> 於 2019年8月1日 週四 下午7:09 寫道：

…

@peter279k <https://github.com/peter279k> Exactly. One of the main benefits. It's also not currently possible to get the SSH2 PHP extension installed correctly on Travis, so testing has to be done locally at the moment. This would be mitigated it the extension was not required. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#2?email_source=notifications&email_token=ACE2SMYDPBPGZAHTKNOQ3ZDQCK777A5CNFSM4IILGL6KYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD3KG2ZY#issuecomment-517238119>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ACE2SM3WKRX6VFGVVKTLTGDQCK777ANCNFSM4IILGL6A> .

[DivineOmega]

@peter279k Thanks for the info. However, I believe I attempting this method. It does not seem to work on modern PHP versions (>= 7.1).

[peter279k]

Maybe I will try that later.

[DivineOmega]

That'd be good. I'd prefer to have Travis testing the package if possible.

[peter279k]

@DivineOmega, it seems that the ssh2 extension has been already loaded in Travis CI build with php-7.1, and php-7.2 build environment.

I also have the successful tests during Travis CI build.

To enable that ssh2 extension, adding the echo "extension=ssh2.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini this line before using the php-ssh2 extension.

For php-7.3 test, we should do following steps:

• Clone the latest php-ssh2 project from git.php.net.
• Running phpize, make and make install.
• It will be done for php-ssh2 compilation and adding the extension=ssh2.so in specific php.ini file to enable ssh2 extension.

I also create the sample_connect.php to validate the SSH2 connection is successful for using the public key authentication during Travis CI build.

The Travis CI build results are as follows:

• Travis CI build log
• Travis setting file

[DivineOmega]

This is great. Thanks for investigating it further for me.

Feel free to open a PR that applies this .travis config file to the repo, if you wish.

[DivineOmega]

Since we can now correctly test the SSH extension version with Travis, I'm less concerned about moving to phpseclib. Thank @peter279k.

However, I'll leave this issue open as it is still a possible improvement for the future.

[peter279k]

@DivineOmega, thanks for your concern.

I agree with that we can leave this issue and keep this issue open.