How to get SSL certificate info with CURL in PHP?

Question

I would like to be able to read the SSL certificate information with CURL. From the Linux console I get this response header:

GET https://www.google.com/ -ed
Cache-Control: private, max-age=0
Connection: close
Date: Sun, 20 Jun 2010 21:34:12 GMT
Server: gws
Content-Type: text/html; charset=ISO-8859-1
Expires: -1
Client-Date: Sun, 20 Jun 2010 21:34:18 GMT
Client-Peer: 66.102.13.106:443
Client-Response-Num: 1
Client-SSL-Cert-Issuer: /C=ZA/O=Thawte Consulting (Pty) Ltd./CN=Thawte SGC CA
Client-SSL-Cert-Subject: /C=US/ST=California/L=Mountain View/O=Google Inc/CN=www.google.com
Client-SSL-Cipher: RC4-SHA
Client-SSL-Warning: Peer certificate not verified
Set-Cookie: PREF=ID=4d56960f6e3ad831:TM=1277069652:LM=1277069652:S=GF-w8Yc-_61NBzzJ; expires=Tue, 19-Jun-2012 21:34:12 GMT; path=/; domain=.google.com
Title: Google
X-XSS-Protection: 1; mode=block

But with CURL the header is much shorter:

HTTP/1.1 200 OK
Date: Sun, 20 Jun 2010 21:39:07 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=UTF-8
Set-Cookie: PREF=ID=2d4fb1c933eebd09:TM=1277069947:LM=1277069947:S=6_TgGKzD0rM4IWms; expires=Tue, 19-Jun-2012 21:39:07 GMT; path=/; domain=.google.com
Server: gws
X-XSS-Protection: 1; mode=block
Transfer-Encoding: chunked

Is there any possibility to get these information, the full header with CURL or with some other PHP function?

Answer 1

You will get the certificate as a resource using stream_context_get_params . Plug that resource into $certinfo = openssl_x509_parse($cert['options']['ssl']['peer_certificate']); to get more certificate information.

$url = "http://www.google.com";
$orignal_parse = parse_url($url, PHP_URL_HOST);
$get = stream_context_create(array("ssl" => array("capture_peer_cert" => TRUE)));
$read = stream_socket_client("ssl://".$orignal_parse.":443", $errno, $errstr, 30, STREAM_CLIENT_CONNECT, $get);
$cert = stream_context_get_params($read);
$certinfo = openssl_x509_parse($cert['options']['ssl']['peer_certificate']);
print_r($certinfo);

Example result

Array
(
    [name] => /C=US/ST=California/L=Mountain View/O=Google Inc/CN=www.google.com
    [subject] => Array
        (
            [C] => US
            [ST] => California
            [L] => Mountain View
            [O] => Google Inc
            [CN] => www.google.com
        )

    [hash] => dcdd9741
    [issuer] => Array
        (
            [C] => US
            [O] => Google Inc
            [CN] => Google Internet Authority G2
        )

    [version] => 2
    [serialNumber] => 3007864570594926146
    [validFrom] => 150408141631Z
    [validTo] => 150707000000Z
    [validFrom_time_t] => 1428498991
    [validTo_time_t] => 1436223600
    [purposes] => Array
        (
            [1] => Array
                (
                    [0] => 1
                    [1] => 
                    [2] => sslclient
                )

            [2] => Array
                (
                    [0] => 1
                    [1] => 
                    [2] => sslserver
                )

            [3] => Array
                (
                    [0] => 1
                    [1] => 
                    [2] => nssslserver
                )

            [4] => Array
                (
                    [0] => 
                    [1] => 
                    [2] => smimesign
                )

            [5] => Array
                (
                    [0] => 
                    [1] => 
                    [2] => smimeencrypt
                )

            [6] => Array
                (
                    [0] => 1
                    [1] => 
                    [2] => crlsign
                )

            [7] => Array
                (
                    [0] => 1
                    [1] => 1
                    [2] => any
                )

            [8] => Array
                (
                    [0] => 1
                    [1] => 
                    [2] => ocsphelper
                )

        )

    [extensions] => Array
        (
            [extendedKeyUsage] => TLS Web Server Authentication, TLS Web Client Authentication
            [subjectAltName] => DNS:www.google.com
            [authorityInfoAccess] => CA Issuers - URI:http://pki.google.com/GIAG2.crt
OCSP - URI:http://clients1.google.com/ocsp

            [subjectKeyIdentifier] => FD:1B:28:50:FD:58:F2:8C:12:26:D7:80:E4:94:E7:CD:BA:A2:6A:45
            [basicConstraints] => CA:FALSE
            [authorityKeyIdentifier] => keyid:4A:DD:06:16:1B:BC:F6:68:B5:76:F5:81:B6:BB:62:1A:BA:5A:81:2F

            [certificatePolicies] => Policy: 1.3.6.1.4.1.11129.2.5.1

            [crlDistributionPoints] => URI:http://pki.google.com/GIAG2.crl

        )

)

Answer 2

No. EDIT : A CURLINFO_CERTINFO option has been added to PHP 5.3.2. See http://bugs.php.net/49253

Apparently, that information is being given to you by your proxy in the response headers. If you want to rely on that, you can use curl's CURLOPT_HEADER option to true to include the headers in the output.

However, to retrieve the certificate without relying on some proxy, you must do

<?php
$g = stream_context_create (array("ssl" => array("capture_peer_cert" => true)));
$r = fopen("https://www.google.com/", "rb", false, $g);
$cont = stream_context_get_params($r);
var_dump($cont["options"]["ssl"]["peer_certificate"]);

You can manipulate the value of $cont["options"]["ssl"]["peer_certificate"] with the OpenSSL extension.

EDIT : This option is better since it doesn't actually make the HTTP request and does not require allow_url_fopen :

<?php
$g = stream_context_create (array("ssl" => array("capture_peer_cert" => true)));
$r = stream_socket_client("ssl://www.google.com:443", $errno, $errstr, 30,
    STREAM_CLIENT_CONNECT, $g);
$cont = stream_context_get_params($r);
var_dump($cont["options"]["ssl"]["peer_certificate"]);

Answer 3

To do this in php and curl:

<?php
if($fp = tmpfile())
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL,"https://www.digicert.com/");
    curl_setopt($ch, CURLOPT_STDERR, $fp);
    curl_setopt($ch, CURLOPT_CERTINFO, 1);
    curl_setopt($ch, CURLOPT_VERBOSE, 1);
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch, CURLOPT_NOBODY, 1);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST,  2);
    $result = curl_exec($ch);
    curl_errno($ch)==0 or die("Error:".curl_errno($ch)." ".curl_error($ch));
    fseek($fp, 0);//rewind
    $str='';
    while(strlen($str.=fread($fp,8192))==8192);
    echo $str;
    fclose($fp);
}
?>

Answer 4

This code snippet isn't using curl specifically, but it retrieves and prints the remote certificate text (can be manipulated to return whatever detail you want using the various openssl_ functions)

$g = stream_context_create (array("ssl" => array("capture_peer_cert" => true)));
$r = fopen("https://somesite/my/path/", "rb", false, $g);
$cont = stream_context_get_params($r);
openssl_x509_export($cont["options"]["ssl"]["peer_certificate"],$cert);
print $cert;

outputs:

-----BEGIN CERTIFICATE-----
...certificate content...
-----END CERTIFICATE-----

Answer 5

这可以做到这一点

[mulhasan@sshgateway-01 ~]$ curl --insecure -v https://yourdomain.com 2>&1 | awk 'BEGIN { cert=0 } /^\* SSL connection/ { cert=1 } /^\*/ { if (cert) print }'