Add PAM session wrapper

remoting/host/pam_authorization_factory_posix.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/host/pam_authorization_factory_posix.h"
 
 #include <security/pam_appl.h>
 
 #include <utility>
 
@@ skipping 104 matching lines @@
 
 bool PamAuthorizer::IsLocalLoginAllowed() {
   std::string username = GetUsername();
   if (username.empty()) {
     return false;
   }
   struct pam_conv conv = { PamConversation, nullptr };
   pam_handle_t* handle = nullptr;
   int result = pam_start("chrome-remote-desktop", username.c_str(),
                          &conv, &handle);
+  HOST_LOG << "pam_start: " << pam_strerror(handle, result);

[rkjnsn, 2016/11/15 22:56:48]

Oops. These were for debugging. They'll be removed in future revisions.

   if (result == PAM_SUCCESS) {
     result = pam_acct_mgmt(handle, 0);
+    HOST_LOG << "pam_acct_mgmt: " << pam_strerror(handle, result);
   }
   pam_end(handle, result);
 
   HOST_LOG << "Local login check for " << username
             << (result == PAM_SUCCESS ? " succeeded." : " failed.");
 
   return result == PAM_SUCCESS;
 }
 
 int PamAuthorizer::PamConversation(int num_messages,
@@ skipping 33 matching lines @@
 
 std::unique_ptr<protocol::Authenticator>
 PamAuthorizationFactory::CreateAuthenticator(const std::string& local_jid,
                                              const std::string& remote_jid) {
   std::unique_ptr<protocol::Authenticator> authenticator(
       underlying_->CreateAuthenticator(local_jid, remote_jid));
   return base::MakeUnique<PamAuthorizer>(std::move(authenticator));
 }
 
 }  // namespace remoting