PHP ActiveX

SSH Public Key Authentication

Demonstrates authenticating with an SSH server using public-key authentication. A private key is loaded into an SshKey object and passed to AuthenticatePk. The matching public key must already be installed on the server for the account.

Note: The private-key path is relative to the application's current working directory. Supply the path to your own key file.

Background: Public-key authentication is the standard for unattended and automated SSH: the private key never leaves the client, the server merely trusts the corresponding public key, and no reusable password crosses the wire. SshKey imports several formats — OpenSSH PEM keys via FromOpenSshPrivateKey and PuTTY .ppk files via FromPuttyPrivateKey — encrypted or not. For an encrypted key, set the Password property before importing. Note that LoadText is only a convenience for reading a text file into a string; it does not itself load the key.

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<?php

$success = 0;

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  Demonstrates authenticating with an SSH server using public-key authentication.  The matching
//  public key must already be installed on the SSH server for the account.

$ssh = new COM("Chilkat.Ssh");

//  Timeouts, in milliseconds.
$ssh->ConnectTimeoutMs = 5000;
$ssh->ReadTimeoutMs = 15000;

$hostname = 'ssh.example.com';
$port = 22;
$success = $ssh->Connect($hostname,$port);
if ($success == 0) {
    print $ssh->LastErrorText . "\n";
    exit;
}

//  LoadText is a convenience method that reads any text file into a string.  It does not itself
//  load the key.
$key = new COM("Chilkat.SshKey");
$privKeyText = $key->loadText('qa_data/my_private_key.pem');
if ($key->LastMethodSuccess == 0) {
    print $key->LastErrorText . "\n";
    exit;
}

//  Import the private key.  Both OpenSSH and PuTTY formats are supported, encrypted or not.
//  This example loads an unencrypted OpenSSH-format key; for a PuTTY .ppk file, call
//  FromPuttyPrivateKey instead.  For an encrypted key, set key.Password before importing.
$success = $key->FromOpenSshPrivateKey($privKeyText);
if ($success == 0) {
    print $key->LastErrorText . "\n";
    exit;
}

$success = $ssh->AuthenticatePk('mySshLogin',$key);
if ($success == 0) {
    print $ssh->LastErrorText . "\n";
    exit;
}

print 'Public-key authentication successful.' . "\n";

$ssh->Disconnect();

?>