How to send a curl request with pem certificate via PHP?

Question

I have a php script in my Apache server that have to send a curl request to a partner's server. Partner give me a .pem file that I have to attach to every call I do to its api.

My php script is the follow:

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_SSLCERT, "test.pem" );
curl_setopt($ch,CURLOPT_SSLCERTTYPE,"PEM");

curl_setopt($ch, CURLOPT_RETURNTRANSFER, True);
curl_setopt($ch, CURLOPT_POST, True);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_POSTFIELDS, $json);
curl_setopt($ch, CURLOPT_VERBOSE, true);

$result = curl_exec($ch);

if(!$result)
{
    echo "Curl Error: " . curl_error($ch);
}
else
{
    echo "Success: ". $result;
}

curl_close($ch);

It returns:

Curl Error: unable to set private key file: 'test.pem' type PEM

Consider that it sends me .pem file and says "it has no passphrase"

Answer 1

I think that you need to use the tmpfile() and stream_get_meta_data.

$pemFile = tmpfile();
fwrite($pemFile, "test.pem");//the path for the pem file
$tempPemPath = stream_get_meta_data($pemFile);
$tempPemPath = $tempPemPath['uri'];
curl_setopt($ch, CURLOPT_SSLCERT, $tempPemPath); 

Source: This answer here in SO helps me with similar problem.

Answer 2

I think you're missing curl_setopt($ch, CURLOPT_CAINFO, 'test.pem'); Have a look at cURL is unable to use client certificate , in local server for more about using client certificates in curl via PHP