phpseclib是否校验SSH指纹？历史版本未支持现是否已实现？

Hey there! Let's break down your questions about phpseclib and SSH fingerprint checks clearly:

1. Does phpseclib verify SSH fingerprints? #

This depends entirely on the version you're working with:

• For phpseclib 1.x: By default, it doesn't handle automatic SSH fingerprint verification. You'd need to write custom logic to fetch the server's fingerprint and compare it against a trusted value on your own.
• For phpseclib 2.x and 3.x: Fingerprint verification is natively supported. The library includes built-in mechanisms for this, and you can easily enforce checks by specifying your trusted fingerprint when setting up a connection.

2. Since phpseclib didn't support SSH fingerprint verification before, does the current version support it? #

Absolutely! Starting from phpseclib 2.0, native SSH fingerprint verification was added to the library—no more custom code needed. Here's a quick, practical example of how to implement this in phpseclib 3.x:

<?php
include 'vendor/autoload.php';

use phpseclib3\Net\SSH2;

// Initialize SSH connection
$ssh = new SSH2('your-server-hostname.com');
// Replace this with your actual trusted server fingerprint
$trustedFingerprint = 'SHA256:abc123def456ghi789jkl012mno345pqr678stu901vwx';

// Verify fingerprint before proceeding
if (!$ssh->verifyFingerprint($trustedFingerprint)) {
    die("Warning: Server fingerprint doesn't match trusted value! Aborting connection.");
}

// Proceed with authentication if verification passes
if ($ssh->login('your-username', 'your-password')) {
    echo "Connection established successfully!";
} else {
    die("Login failed.");
}
?>

This snippet ensures you only connect to the server you trust by validating its fingerprint upfront.

内容的提问来源于stack exchange，提问作者Prashant Baldha