hostap/hs20/server/www/est.php

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<?php
require('config.php');
$params = explode("/", $_SERVER["PATH_INFO"], 3);
$realm = $params[1];
$cmd = $params[2];
$method = $_SERVER["REQUEST_METHOD"];
unset($user);
unset($rowid);
if (!empty($_SERVER['PHP_AUTH_DIGEST'])) {
$needed = array('nonce'=>1, 'nc'=>1, 'cnonce'=>1, 'qop'=>1, 'username'=>1,
'uri'=>1, 'response'=>1);
$data = array();
$keys = implode('|', array_keys($needed));
preg_match_all('@(' . $keys . ')=(?:([\'"])([^\2]+?)\2|([^\s,]+))@',
$_SERVER['PHP_AUTH_DIGEST'], $matches, PREG_SET_ORDER);
foreach ($matches as $m) {
$data[$m[1]] = $m[3] ? $m[3] : $m[4];
unset($needed[$m[1]]);
}
if ($needed) {
error_log("EST: Missing auth parameter");
die('Authentication failed');
}
$user = $data['username'];
if (strlen($user) < 1) {
error_log("EST: Empty username");
die('Authentication failed');
}
$db = new PDO($osu_db);
if (!$db) {
error_log("EST: Could not access database");
die("Could not access database");
}
$sql = "SELECT rowid,password,operation FROM sessions " .
"WHERE user='$user' AND realm='$realm'";
$q = $db->query($sql);
if (!$q) {
error_log("EST: Session not found for user=$user realm=$realm");
die("Session not found");
}
$row = $q->fetch();
if (!$row) {
error_log("EST: Session fetch failed for user=$user realm=$realm");
die('Session not found');
}
$rowid = $row['rowid'];
$oper = $row['operation'];
if ($oper != '5') {
error_log("EST: Unexpected operation $oper for user=$user realm=$realm");
die("Session not found");
}
$pw = $row['password'];
if (strlen($pw) < 1) {
error_log("EST: Empty password for user=$user realm=$realm");
die('Authentication failed');
}
$A1 = md5($user . ':' . $realm . ':' . $pw);
$A2 = md5($method . ':' . $data['uri']);
$resp = md5($A1 . ':' . $data['nonce'] . ':' . $data['nc'] . ':' .
$data['cnonce'] . ':' . $data['qop'] . ':' . $A2);
if ($data['response'] != $resp) {
error_log("EST: Incorrect authentication response for user=$user realm=$realm");
die('Authentication failed');
}
}
if ($method == "GET" && $cmd == "cacerts") {
$fname = "$osu_root/est/$realm-cacerts.pkcs7";
if (!file_exists($fname)) {
error_log("EST: cacerts - unknown realm $realm");
die("Unknown realm");
}
header("Content-Transfer-Encoding: base64");
header("Content-Type: application/pkcs7-mime");
$data = file_get_contents($fname);
echo wordwrap(base64_encode($data), 72, "\n", true);
echo "\n";
error_log("EST: cacerts");
} else if ($method == "GET" && $cmd == "csrattrs") {
header("Content-Transfer-Encoding: base64");
header("Content-Type: application/csrattrs");
readfile("$osu_root/est/est-attrs.b64");
error_log("EST: csrattrs");
} else if ($method == "POST" && $cmd == "simpleenroll") {
if (!isset($user) || strlen($user) == 0) {
header('HTTP/1.1 401 Unauthorized');
header('WWW-Authenticate: Digest realm="'.$realm.
'",qop="auth",nonce="'.uniqid().'",opaque="'.md5($realm).'"');
error_log("EST: simpleenroll - require authentication");
die('Authentication required');
}
if (!isset($_SERVER["CONTENT_TYPE"])) {
error_log("EST: simpleenroll without Content-Type");
die("Missing Content-Type");
}
if (!stristr($_SERVER["CONTENT_TYPE"], "application/pkcs10")) {
error_log("EST: simpleenroll - unexpected Content-Type: " .
$_SERVER["CONTENT_TYPE"]);
die("Unexpected Content-Type");
}
$data = file_get_contents("php://input");
error_log("EST: simpleenroll - POST data from php://input: " . $data);
$req = base64_decode($data);
if ($req == FALSE) {
error_log("EST: simpleenroll - Invalid base64-encoded PKCS#10 data");
die("Invalid base64-encoded PKCS#10 data");
}
$cadir = "$osu_root/est";
$reqfile = "$cadir/tmp/cert-req.pkcs10";
$f = fopen($reqfile, "wb");
fwrite($f, $req);
fclose($f);
$req_pem = "$reqfile.pem";
if (file_exists($req_pem))
unlink($req_pem);
exec("openssl req -in $reqfile -inform DER -out $req_pem -outform PEM");
if (!file_exists($req_pem)) {
error_log("EST: simpleenroll - Failed to parse certificate request");
die("Failed to parse certificate request");
}
/* FIX: validate request and add HS 2.0 extensions to cert */
$cert_pem = "$cadir/tmp/req-signed.pem";
if (file_exists($cert_pem))
unlink($cert_pem);
exec("openssl x509 -req -in $req_pem -CAkey $cadir/cakey.pem -out $cert_pem -CA $cadir/cacert.pem -CAserial $cadir/serial -days 365 -text");
if (!file_exists($cert_pem)) {
error_log("EST: simpleenroll - Failed to sign certificate");
die("Failed to sign certificate");
}
$cert = file_get_contents($cert_pem);
$handle = popen("openssl x509 -in $cert_pem -serial -noout", "r");
$serial = fread($handle, 200);
pclose($handle);
$pattern = "/serial=(?P<snhex>[0-9a-fA-F:]*)/m";
preg_match($pattern, $serial, $matches);
if (!isset($matches['snhex']) || strlen($matches['snhex']) < 1) {
error_log("EST: simpleenroll - Could not get serial number");
die("Could not get serial number");
}
$sn = str_replace(":", "", strtoupper($matches['snhex']));
$user = "cert-$sn";
error_log("EST: user = $user");
$cert_der = "$cadir/tmp/req-signed.der";
if (file_exists($cert_der))
unlink($cert_der);
exec("openssl x509 -in $cert_pem -inform PEM -out $cert_der -outform DER");
if (!file_exists($cert_der)) {
error_log("EST: simpleenroll - Failed to convert certificate");
die("Failed to convert certificate");
}
$der = file_get_contents($cert_der);
$fingerprint = hash("sha256", $der);
$pkcs7 = "$cadir/tmp/est-client.pkcs7";
if (file_exists($pkcs7))
unlink($pkcs7);
exec("openssl crl2pkcs7 -nocrl -certfile $cert_pem -out $pkcs7 -outform DER");
if (!file_exists($pkcs7)) {
error_log("EST: simpleenroll - Failed to prepare PKCS#7 file");
die("Failed to prepare PKCS#7 file");
}
if (!$db->exec("UPDATE sessions SET user='$user', cert='$fingerprint', cert_pem='$cert' WHERE rowid=$rowid")) {
error_log("EST: simpleenroll - Failed to update session database");
die("Failed to update session database");
}
header("Content-Transfer-Encoding: base64");
header("Content-Type: application/pkcs7-mime");
$data = file_get_contents($pkcs7);
$resp = wordwrap(base64_encode($data), 72, "\n", true);
echo $resp . "\n";
error_log("EST: simpleenroll - PKCS#7 response: " . $resp);
} else {
header("HTTP/1.0 404 Not Found");
error_log("EST: Unexpected method or path");
die("Unexpected method or path");
}
?>