Add a bundled cacert.pem as a last resort option

src/Composer/Compiler.php

@@ -110,6 +110,9 @@ class Compiler
             $this->addFile($phar, new \SplFileInfo(__DIR__.'/../../vendor/composer/include_paths.php'));
         }
         $this->addFile($phar, new \SplFileInfo(__DIR__.'/../../vendor/composer/ClassLoader.php'));
+
+        $this->addFile($phar, new \SplFileInfo(__DIR__ . '/../../res/cacert.pem'), false);
+
         $this->addComposerBin($phar);
 
         // Stubs

src/Composer/Util/ConfigValidator.php

@@ -50,7 +50,7 @@ class ConfigValidator
         // validate json schema
         $laxValid = false;
         try {
-            $json = new JsonFile($file, Factory::createRemoteFilesystem($this->io)); //TODO
+            $json = new JsonFile($file, Factory::createRemoteFilesystem($this->io)); //TODO - can't configure here obviouslyS
             $manifest = $json->read();
 
             $json->validateSchema(JsonFile::LAX_SCHEMA);

src/Composer/Util/RemoteFilesystem.php

@@ -486,14 +486,27 @@ class RemoteFilesystem
         );
         
         /**
-         * Attempt to find a local cafile or throw an exception.
+         * Attempt to find a local cafile or throw an exception if none pre-set
          * The user may go download one if this occurs.
          */
-        $result = $this->getSystemCaRootBundlePath();
+        if (!isset($this->options['ssl']['cafile'])) {
-        if ($result) {
+            $result = $this->getSystemCaRootBundlePath();
-            $options['ssl']['cafile'] = $result;
+            if ($result) {
-        } else {
+                if (preg_match("|^phar://|", $result)) {
-            throw new TransportException('A valid cafile could not be located automatically.');
+                    $tmp = rtrim(sys_get_temp_dir(), '\\/');
+                    $target = $tmp . DIRECTORY_SEPARATOR . 'composer-cacert.pem';
+                    $cacert = file_get_contents($result);
+                    $write = file_put_contents($target, $cacert, LOCK_EX);
+                    if (!$write) {
+                        throw new TransportException('Unable to write bundled cacert.pem to: '.$target);
+                    }
+                    $options['ssl']['cafile'] = $target;
+                } else {
+                    $options['ssl']['cafile'] = $result;
+                }
+            } else {
+                throw new TransportException('A valid cafile could not be located automatically.');
+            }
         }
 
         /**
@@ -560,13 +573,20 @@ class RemoteFilesystem
             '/opt/local/share/curl/curl-ca-bundle.crt', // OS X macports, curl-ca-bundle package
             '/usr/local/share/curl/curl-ca-bundle.crt', // Default cURL CA bunde path (without --with-ca-bundle option)
             '/usr/share/ssl/certs/ca-bundle.crt', // Really old RedHat?
+            __DIR__.'/../../../res/cacert.pem', // Bundled with Composer
         );
 
         static $found = false;
-        foreach ($caBundlePaths as $caBundle) {
+        $configured = ini_get('openssl.cafile');
-            if (is_readable($caBundle) && \openssl_x509_parse(file_get_contents($caBundle))) {
+        if ($configured && strlen($configured) > 0 && is_readable($caBundle) && \openssl_x509_parse(file_get_contents($caBundle))) {
-                $found = true;
+            $found = true;
-                break;
+            $caBundle = $configured;
+        } else {
+            foreach ($caBundlePaths as $caBundle) {
+                if (is_readable($caBundle) && \openssl_x509_parse(file_get_contents($caBundle))) {
+                    $found = true;
+                    break;
+                }
             }
         }
         if ($found) {