I need informations about security risks and proof of concepts to work with an local client.
In my option, a user will install two components:
The game client
The client launcher
The launcher is running as an background process all the time. The launcher provides an WebSocket server.
The user will open my website to start the game (with game-server lists and other settings). The Website connects to the game launcher to handle all actions (change configuration, start the game executable)..
Problem:
How realize the communication with the website and the game launcher? Okay, Websockets, yes. But browsers forbid to connect to localhost/127.0.0.1 by security reason.
An fake-pointer as DNS or hosts-file to an subdomain like local.game.tld is bad, because SSL-Certificates can be revoked here as bad usage.
Another idea was to provide an NPAPI-Plugin for the browser. But it seems, that the NPAPI is deprecated and useless for the future.
Whats the best practice to communicate between webpages and local installed software?
But browsers forbid to connect to localhost/127.0.0.1 by security reason
This isn't true. Browsers allow you to connect to localhost / 127.0.0.1. I do it all the time on my machine.
The issue is that TLS (wss://localhost, not ws://localhost) requires a certificate and browsers forbid mixed content (you can't have an https website load non-encrypted resources).
fake-pointer as DNS or hosts-file to an subdomain like local.game.tld is bad, because SSL-Certificates can be revoked here as bad usage.
As part of your game installer you could create a hosts file entry with a certificate for mygame.localhost (possibly using a local script) and then ask the player to authorize the installation of the certificate using their password. This way your certificate won't be revoked... but you are right that this his suboptimal.
EDIT: also, please note that the domain name must be at the end, not at the beginning (i.e., game.localhost and not localhost.game).
Whats the best practice to communicate between webpages and local installed software?
Generally speaking, if your game is installed on the local machine, there's no need to encrypt the communication between the local browser and the local machine.
You can easily write your local server to accept only connections from the local machine (or, at worst, if need be, accept connections from the local area network - though this adds security risks).
Your webpage and WebSocket data can be sent "in the clear" (ws:// and http://) between the local server and the browser since they are both on the same machine - this way you don't need a browser. The local server would initiate (as a client) any encrypted connection it needs when communicating with an external service (was:// / https://).
EDIT (from the comments):
There are the only 2 solutions I know of:
Installing a self-signed certificate; or
Using http instead of https and having the server handle outside traffic as if it were a client (so all traffic going outside is encrypted).
I'm using Service Stack Server Event to push notification to the clients, but one customer need to host Server Stack apphost behind a Citrix Netscaler. In this scenario all connection seems to be aborted by the cliet and sse does not work.
In the post SSE with ServiceStack not working with netscaler mythz suggest to setup citrix in order to prevent the backend Server from Sending Chunked Responses.
Does anyone know if it works?
Note that if I point directly to the apphost instead of the netloader sse works perfectly.
You can use the solution that you linked, disable chunks https://support.citrix.com/article/CTX121948 or, expanding on mythz, you can use either SSL_BRIDGE or just TCP vserver and service types, so that the netscaler does not perform HTTP inspection.
The only other thing I'd add to the linked answer that could help is using SSL which would prevent deep packet inspection and potentially any interference by any middleware.
I create a webrtc sample based On this tutorial. this work on my local network fine and I can send and receive signal and videos. but when I connect from internet ti the server and two peer are not in same network video connection does not create.
I am using self sign Certificate and must add them two browsers.
there is no error or exception. my signaling server is a web socket server written in nodejs.
Original Answer
I believe that you require a HTTPS (SSL certificate) if you are using Chrome +47 to be deployed online, but is not required if serving from a local machine on the same network.
According to caniuse; Edge and Firefox may yield non blocking results (but prefix with moz):http://caniuse.com/#feat=stream
The issue isn't necessarily WebRTC but getUserMedia/Stream API isn't provided when the called from a non-secure site (or non-localhost address).
Attached Image:
(https://developers.google.com/web/updates/2015/10/chrome-47-webrtc)
Update:
Did a bit more digging around, and the following answer is related to the question getUserMedia() in chrome 47 without using https i.e. possible duplicate;
You "can" launch a Chrome browser to accept the insecure origin; however, that's temp. fix, whereas you'd probably want to get a certificate.
chrome.exe --user-data-dir=/test/only/profile/dir --unsafely-treat-insecure-origin-as-secure="http://example.com"
I have a classic ASP website running on a Windows Server 2012 box. One page makes a HTTP request to another application over https using code like this:
Sub ShopXML4http(url, inStr, outStr, method, xmlerror)
Dim objhttp
Set objhttp = Server.CreateObject ("MSXML2.ServerXMLHTTP.6.0")
objHttp.open method, url, false
If Method="POST" Then
objHttp.Send instr
Else
objHttp.Send
End if
outstr=objHttp.responseText
Set objhttp=nothing
End Sub
This code works fine almost all of the time (thousands of requests per day), but sporadically it will fail with a message like this:
Number: -2147012739
Description: An error occurred in the secure channel support
Source: msxml6.dll
The application was recently moved from an old Windows 2003 Server to the 2012 Server, and this issue never seemed to be a problem on the old server. In addition, while this error is happening on the website, I could run the exact same code in a VBScript and it works fine. Resetting the application pool seems to cause the site to be able to do the secure HTTP requests again (although it often fixes itself before I can get to the server).
I have had the exact same problem after migrating from 2003 to 2008 R2 and found the solution. Change:
Set objhttp = Server.CreateObject ("MSXML2.ServerXMLHTTP.6.0")
to:
Set objhttp = Server.CreateObject ("MSXML2.XMLHTTP.6.0")
and your problem will go away.
I tried to find the pros and cons about both objects, but haven't yet found a reason to not use XMLHTTP.
I've had the same issue and tried lots of solutions offered under a variety of posts but ultimately had no success, until now. I'll detail the solution that worked for me with reference to the problem as in my case it was PayPal. I've not opened a new post as this might not be just a paypal issue in future.
The solution is a combination of a number of stackoverflow posted solutions to similar problems but this seemed the best one to add to.
The problem
Trying to test PayPal IPN on Windows Server 2008 using classic ASP using the PayPal Sandbox returns the error "An error occurred in the secure channel support".
Why it is a problem
PayPal is requiring all communications with their systems to be as secure as possible. You will need a connection that is TLS 1.2. Windows Server 2008 is not TLS 1.2 by default.
PayPal threw some confusion into the mix by saying you need a Verisign G5 certificate, which you do for the server root but not the domain you are running your code on. I also didn't install any PayPal certificates as I don't use the API. I don't believe you need your comms from an HTTPS site either - although my domain is secured using a standard GoDaddy EV cert although I did a test on a non HTTPS site after and that worked too.
My solution
First check which kind of security your server is using via SSL Labs.
It should be TLS1.2 or higher and no other TLS's or SSL's. It must also have a SHA256 encryption.
You may need to patch the server: https://support.microsoft.com/en-us/kb/3106991.
Use IISCrypto to set the correct TLS and ciphers. I used the registry changes offered up elsewhere on stackoverflow but this did not work and actually totally screwed up my server for everything using HTTPS posts, not just my development site! IISCrypto also handles the ciphers.
Make sure your application pool is v4.5, which in itself is unclear because IIS might only offer v4.0 as an option. However this is probably actually v4.5. You can verify this via https://msdn.microsoft.com/en-us/library/hh925568(v=vs.110).aspx.
Within your code you need to use Server.CreateObject ("MSXML2.XMLHTTP.6.0"), not Server.CreateObject ("MSXML2.ServerXMLHTTP.6.0") as mentioned above.
Now I've no idea why the non-server XMLHTTP works as that seems contrary to the documentation behind it. Right now, after 10 days of stress, panic and frustration I don't care! I hope this is useful for others.
Finding the solution was a nightmare so I'll add some phrases below to help others if searching:
PayPal IPN failing with server error
PayPal SSL Windows 2008 errors
An error occurred in the secure channel support
classic ASP PayPal Sandbox SSL errors
I'd like to publicly thank Rackspace and GoDaddy for their help with this. I'd like to publicly state that I found paypal have the worst technical support ever and just do not care, constantly pointing to their own docs, if they ever respond. They say they've been sending emails out about this since September 2014 but I never received one. These new requirements are active on the PayPal Sandbox but go live in September 2016. I only came across it as developing a new solution so needed the sandbox - if you're running live you won't know about the problem until it hits and then you're dead in the water. Test your entire payment system on the PayPal sandbox asap is my advice!!
None of the answers above applies to my situation. Then I hopped on the link here:
https://support.microsoft.com/en-za/help/3140245/update-to-enable-tls-1-1-and-tls-1-2-as-a-default-secure-protocols-in
This update provides support for Transport Layer Security (TLS) 1.1 and TLS 1.2 in Windows Server 2012, Windows 7 Service Pack 1 (SP1), and Windows Server 2008 R2 SP1.
Applications and services that are written by using WinHTTP for Secure Sockets Layer (SSL) connections that use the WINHTTP_OPTION_SECURE_PROTOCOLS flag can't use TLS 1.1 or TLS 1.2 protocols. This is because the definition of this flag doesn't include these applications and services.
This update adds support for DefaultSecureProtocols registry entry that allows the system administrator to specify which SSL protocols should be used when the WINHTTP_OPTION_SECURE_PROTOCOLS flag is used.
This can allow certain applications that were built to use the WinHTTP default flag to be able to leverage the newer TLS 1.2 or TLS 1.1 protocols natively without any need for updates to the application.
This is the case for some Microsoft Office applications when they open documents from a SharePoint library or a Web Folder, IP-HTTPS tunnels for DirectAccess connectivity, and other applications by using technologies such as WebClient by using WebDav, WinRM, and others.
This update will not change the behavior of applications that are manually setting the secure protocols instead of pass the default flag.
Client service on Windows 2008 R2 server outbound to server over TLS reciprocated the error in question. I thought it could be cipher suite compatibility. Wireshark trace indicated version in Client Hello request was TLS 1.0 but server requires TLS 1.2. The cipher suites sent to outbound server from client service were fine. The problem is the client service or application on Windows server default employs the system default, which is not TLS 1.2.
The solution is to add a registry subkey named DefaultSecureProtocols with a value corresponding to which TLS version(s) should be supported. Add said registry subkey, with type DWORD, to the following locations:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp
For Internet Explorer fix, you can add a similar registry subkey titled SecureProtocols, also with type DWORD, to the following locations:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings
Below you can find the table of values for both subkeys:
DefaultSecureProtocols Value Protocol enabled
0x00000008 Enable SSL 2.0 by default
0x00000020 Enable SSL 3.0 by default
0x00000080 Enable TLS 1.0 by default
0x00000200 Enable TLS 1.1 by default
0x00000800 Enable TLS 1.2 by default
For example:
The administrator wants to override the default values for WINHTTP_OPTION_SECURE_PROTOCOLS to specify TLS 1.1 and TLS 1.2.
Take the value for TLS 1.1 (0x00000200) and the value for TLS 1.2 (0x00000800) then add them together in calculator (in programmer mode), the resulting registry value would be 0x00000A00.
I applied 0x00000A00 as the value for both subkeys and it successfully resolved the issue.
There is also an Easy Fix (link is here: https://aka.ms/easyfix51044) available from Microsoft, if you don't wish to manually enter registry subkeys and values.
It's all valid however the 'critical' missing bit for TLS1.2 support on Windows 7 with IIS7.5 and classic asp is setting this in the registry:-
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp]
"DefaultSecureProtocols"=dword:00000800
I hope that saves you a day of faffing, rebooting and head scratching! :)
This code snippet is useful for testing. https://www.howsmyssl.com/
<%
Set winhttp = Server.CreateObject("WinHTTP.WinHTTPRequest.5.1")
winhttp.open "GET", "https://howsmyssl.com/a/check", False
winhttp.Send
Response.Write winhttp.responseText
%>
In a Windows Server 2016 Classic ASP script, fetching an HTTPS URL from Windows Server 2012 R2, I recently had to remove SSL 2.0 from SecureProtocols in order to stop this secure channel error -2147012739.
' Use the latest client
Set httpClient = Server.CreateObject("WinHttp.WinHttpRequest.5.1")
' allow only TLS 1.2 or TLS 1.1
Const WHR_SecureProtocols = 9
httpClient.Option(WHR_SecureProtocols) = &h0800 + &h0200
' Other values: TLS 1.0 &h0080, SSL 3.0 &h0020, SSL 2.0 &h0008
' NB Including SSL 2.0 stops https to Windows Server 2012 R2 working
' Other options you may want to set, from https://learn.microsoft.com/en-us/windows/desktop/winhttp/winhttprequestoption
' Ignore certificate errors
Const WHR_SslErrorIgnoreFlags = 4
httpClient.Option(WHR_SslErrorIgnoreFlags) = &h3300
' Don't bother checking cert, or risking failure if we can't check
Const WHR_EnableCertificateRevocationCheck = 18
httpClient.Option(WHR_EnableCertificateRevocationCheck) = False
Troubleshooting error codes:
-2147012739 is a HRESULT.
In hexadecimal that's 0x80072F7D.
Look at the LOWORD: 0x2F7D.
Convert that back to decimal: 12157.
Lookup 12157 error codes.
Find that it matches: ERROR_WINHTTP_SECURE_CHANNEL_ERROR
A bit of Google-fu finds http://msdn.microsoft.com/en-us/library/windows/desktop/aa383770(v=vs.85).aspx which states:
ERROR_WINHTTP_SECURE_CHANNEL_ERROR
12157
Indicates that an error occurred having to do with a secure channel (equivalent to error codes that begin with "SEC_E_" and "SEC_I_" listed in the "winerror.h" header file).
However, you already discovered this as the message you got was "Description: An error occurred in the secure channel support". So this leads us right back where we started.
The other observation I make is that your code is a non-asynchronous WinHTTP request (I know it has to be to function inside ASP), but, the concern is, due to the high frequency, your machine could be processing more than one WinHTTP request concurrently. I've seen some Windows deliberately throttle the total number of active concurrent WinHTTP request by blocking the late requests. For example, on a Windows 7 machine a process cannot make more than 2 concurrent requests to the same remote server. i.e. The 3rd, 4th... requests will be blocked until the first two complete.
One solution is to load balance incoming request over more than one application pool or over more servers.
We had a variation on this issues and it really cost us some time to figure it out.
Here is the situation: An older Linux server hosting an application written in PHP and provides data through webservice calls. The server is using HTTPS. Calls from various clients are made with code using the winHTTP 5.2 library. (Winhttp.dll)
Symptom: Our clients are now getting sporadic error messages when making repeated winHTTP calls using a ‘POST’ command. The messages are either ‘The buffers supplied to a function was to small.‘ or ‘An error occurred in the secure channel support ‘. After much searching we discovered that the client’s server was logging ‘Schannel Event ID 36887 alert code 20’ in the Event Viewer that corresponded with the visible error message.
Solution: We discovered that our old Linux server could not support TLS 1.2. (CentOS 5.11) We also learned that several of our clients had recently (summer 2016) applied an update to their Microsoft servers. (Server 2008, server 2012) The fix was to force their servers to use TLS 1.1 for the webservice calls. The part that is rather strange to me is that the settings in Internet Explorer for changing the TLS had no effect on the problem. However by changing a setting in Group Policies we were able to solve the problem. Our technical advisor on this matter pointed out that the change is really obscure, but that a third-party vendor has provided a quick solution. That tool is called IIS Crypto from Nartac. https://www.nartac.com/Products/IISCrypto/Download
The tool lets you specifically select Protocols.
We are now getting a new server to host our applications (CentOS 6) and then should be able to use the TLS 1.2 protocol!
I encountered this error a few months ago myself. Most often, this issue is caused by an invalid SSL cert. Considering that at the time of the post you had just migrated to a new server, you probably just need to reinstall the SSL certificate.
I realize this question is old, but hopefully someone else can benefit from my answer.
i have a windows 2008 server and a comodo wildcard cerificate.
i also have a couple of applications running under this certificate.
the application and the certificate work fine and are correctly installed.
i have a gprs module from telit that without ssl works fine but when enabling ssl althougth it works it makes 45seconds in handsake to authenticate the server certification.The delay is surely from the handshake because later on the communication is fast enough.
i am searching quite a while for possible problems. i am leaning to believe that the validation of the certification chain is slow.
how can i reduce this time? do you have any other ideas of possible errors or setting issues?
What is likely happening is that you have not installed the intermediate certificates in the chain on the server. This causes the server not to send those to the client and the client needs to fetch them on its own, which causes the delay. Ensure that all certs in the cert chain, except the root, are present in the local machine Intermediate CAs store.
You can use Wireshark or similar tool to look at the network traffic and see what certificates are being sent from the server to the client. If you could capture the client network traffic, you can see whether my theory above is correct or not and what is causing the delay.