Unity3d c#으로 https통신하기

유니티에서 http/https 통신하는 방법은 어셋을 사용하지 않는 선에서 크게 3가지 존재한다.

1. WWW

2. UnityWebRequest

3. HttpWebRequest

3가지 모두 HTTP 통신에는 문제가 없다. 

하지만 HTTPS에서는 문제가 발생한다.

어떤 문제가 있었는지 정리해 본다.

인증서 만드는 법은 여기서

인증서 만들 때, CN값을 MERONG으로 입력해 뒀다.

Unity3d에서 https post로 통신하는 테스트 코드

IEnumerator TestHttpPost(string uri, byte[] bodyData) { //////////////////////////////////////////////////////////////////////////////////////////////////////////// // for WWW //////////////////////////////////////////////////////////////////////////////////////////////////////////// WWW www = new WWW(uri, bodyData); yield return www; Debug.Log("www:" + www.error + " responsed data len:" + www.bytesDownloaded); //////////////////////////////////////////////////////////////////////////////////////////////////////////// // for UnityWebRequest //////////////////////////////////////////////////////////////////////////////////////////////////////////// UnityWebRequest unityWebRequest = UnityWebRequest.Post(uri, Encoding.ASCII.GetString(bodyData)); //UnityWebRequest unityWebRequest = UnityWebRequest.Put(uri, Encoding.ASCII.GetString(bodyData)); yield return unityWebRequest.Send(); if (unityWebRequest.isError) { Debug.Log("UnityWebRequest:" + unityWebRequest.error); } else { Debug.Log("UnityWebRequest: responsed data len:" + unityWebRequest.downloadedBytes); } //////////////////////////////////////////////////////////////////////////////////////////////////////////// // for HttpWebRequest //////////////////////////////////////////////////////////////////////////////////////////////////////////// ServicePointManager.ServerCertificateValidationCallback = delegate { return true; }; HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(uri); httpWebRequest.Method = "POST"; httpWebRequest.ContentType = "application/octet-stream"; httpWebRequest.ContentLength = bodyData.Length; httpWebRequest.BeginGetRequestStream(new AsyncCallback((iar) =>{ try { using (Stream stream = httpWebRequest.EndGetRequestStream(iar)) { if (bodyData != null) { stream.Write(bodyData, 0, bodyData.Length); } stream.Close(); httpWebRequest.BeginGetResponse(new AsyncCallback((IAsyncResult iarres) =>{ try { using (HttpWebResponse response = (HttpWebResponse)httpWebRequest.EndGetResponse(iarres)) { using (StreamReader streamReader = new StreamReader(response.GetResponseStream())) { Debug.Log("HttpWebRequest: responsed data len:" + streamReader.ReadToEnd().Length); } response.Close(); } } catch (Exception e) { Debug.Log(e); } }), null); } } catch (Exception e) { Debug.Log(e); } }), null); } void Start() { StartCoroutine(TestHttpPost("https://localhost:8443" + "/hellomvc2/", new byte[] { 61, 61 })); }

WWW에서 오류발생

www:SSL: certificate subject name 'MERONG' does not match target host name 'localhost' responsed data len:0 UnityEngine.Debug:Log(Object) <TestHttpPost>c__Iterator0:MoveNext() (at Assets/Scripts/UIs/LoginGUI.cs:169) UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)

UnityWebRequest 오류발생

UnityWebRequest:Unknown Error UnityEngine.Debug:Log(Object) <TestHttpPost>c__Iterator0:MoveNext() (at Assets/Scripts/UIs/LoginGUI.cs:159) UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)

HttpWebRequest에서 예외발생

System.Net.WebException: Error getting response stream (Write: The authentication or decryption has failed.): SendFailure ---> System.IO.IOException: The authentication or decryption has failed. ---> Mono.Security.Protocol.Tls.TlsException: The authentication or decryption has failed. at Mono.Security.Protocol.Tls.RecordProtocol.ProcessAlert (AlertLevel alertLevel, AlertDescription alertDesc) [0x00000] in <filename unknown>:0 at Mono.Security.Protocol.Tls.RecordProtocol.InternalReceiveRecordCallback (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0 --- End of inner exception stack trace --- at Mono.Security.Protocol.Tls.SslStreamBase.AsyncHandshakeCallback (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0 --- End of inner exception stack trace --- at System.Net.HttpWebRequest.EndGetRequestStream (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0 at LoginGUI+<TestHttpPost>c__Iterator0+<TestHttpPost>c__AnonStorey1.<>m__0 (IAsyncResult iar) [0x00009] in G:\project\BlueFin\bluefin_dev\server\unity3d_workspace\CS_Sample\Sample\Assets\Scripts\UIs\LoginGUI.cs:115 UnityEngine.Debug:Log(Object) <TestHttpPost>c__AnonStorey1:<>m__0(IAsyncResult) (at Assets/Scripts/UIs/LoginGUI.cs:148) System.Net.WebConnection:InitConnection(Object)

WWW에서 발생한 오류 

www:SSL: certificate subject name 'MERONG' does not match target host name 'localhost'

인증서 CN 값과 연결하려는 호스트 이름이 다르단다.

인증서 만들 때, localhost 를 입력하고 다시 실행해 보자.

www: responsed data len:134 UnityWebRequest: responsed data len:134 System.Net.WebException: Error getting response stream (Write: The authentication or decryption has failed.): SendFailure ---> System.IO.IOException: The authentication or decryption has failed. ---> Mono.Security.Protocol.Tls.TlsException: The authentication or decryption has failed. at Mono.Security.Protocol.Tls.RecordProtocol.ProcessAlert (AlertLevel alertLevel, AlertDescription alertDesc) [0x00000] in <filename unknown>:0 at Mono.Security.Protocol.Tls.RecordProtocol.InternalReceiveRecordCallback (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0 --- End of inner exception stack trace --- at Mono.Security.Protocol.Tls.SslStreamBase.AsyncHandshakeCallback (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0 --- End of inner exception stack trace --- at System.Net.HttpWebRequest.EndGetRequestStream (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0 at LoginGUI+<TestHttpPost>c__Iterator0+<TestHttpPost>c__AnonStorey1.<>m__0 (IAsyncResult iar) [0x00009] in G:\project\BlueFin\bluefin_dev\server\unity3d_workspace\CS_Sample\Sample\Assets\Scripts\UIs\LoginGUI.cs:142 UnityEngine.Debug:Log(Object) <TestHttpPost>c__AnonStorey1:<>m__0(IAsyncResult) (at Assets/Scripts/UIs/LoginGUI.cs:175) System.Net.WebConnection:InitConnection(Object)

이번엔,

WWW과 UnityWebRequest는 정상이지만,

HttpWebRequest 여전히 같은 오류가 난다. 

인증서 CN값이 달라서 오류가 발생한게 아니었다.

HTTPS 통신 성공 이후에 테스트 해 본거지만,

ServicePointManager.ServerCertificateValidationCallback 리턴값을 true로 해줬기 때문에.

인증서 CN값과 호스트 이름이 달라도 동작했다.

이 문제는,

SSL 핸드세이킹 중 복호화 실패 오류인데,

정말 이 문제로 고생 많이 했다. CA로 부터 인증을 못받아서 그런가 싶어

openssl로 CA 인증서도 만들어 봤지만 결과는 동일했다.

다행히,

openssl을 만지는 과정에서 https 사이트에 연결테스트를 해볼 수 있었는데, 거기서 차이점을 발견하게 되었다.

openssl로 localhost와 google를 연결해보았다.

$ openssl s_client -connect localhost:8443 -tls1 Loading 'screen' into random state - done CONNECTED(00000188) depth=0 /C=kr/ST=seoul/L=seoul/O=company/OU=team/CN=localhost verify error:num=18:self signed certificate verify return:1 depth=0 /C=kr/ST=seoul/L=seoul/O=company/OU=team/CN=localhost verify return:1 --- Certificate chain 0 s:/C=kr/ST=seoul/L=seoul/O=company/OU=team/CN=localhost i:/C=kr/ST=seoul/L=seoul/O=company/OU=team/CN=localhost --- Server certificate -----BEGIN CERTIFICATE----- MIIDYzCCAkugAwIBAgIELIf7OjANBgkqhkiG9w0BAQsFADBiMQswCQYDVQQGEwJr cjEOMAwGA1UECBMFc2VvdWwxDjAMBgNVBAcTBXNlb3VsMRAwDgYDVQQKEwdjb21w YW55MQ0wCwYDVQQLEwR0ZWFtMRIwEAYDVQQDEwlsb2NhbGhvc3QwHhcNMTcwNDIx MDYwMTQ5WhcNMjcwNDE5MDYwMTQ5WjBiMQswCQYDVQQGEwJrcjEOMAwGA1UECBMF c2VvdWwxDjAMBgNVBAcTBXNlb3VsMRAwDgYDVQQKEwdjb21wYW55MQ0wCwYDVQQL EwR0ZWFtMRIwEAYDVQQDEwlsb2NhbGhvc3QwggEiMA0GCSqGSIb3DQEBAQUAA4IB DwAwggEKAoIBAQDigSpCI32KkfyIIff1bFe8vBkrxc+sVcCrlLLqach4tBcVn9Ef 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Cipher is DHE-RSA-AES128-SHA Server public key is 2048 bit Compression: NONE Expansion: NONE SSL-Session: Protocol : TLSv1 Cipher : DHE-RSA-AES128-SHA Session-ID: 58F9A34D462F3565E4A1B8354E756B1A690EEE71D6F8364BD77100ADA13FCB71 Session-ID-ctx: Master-Key: 4FEF0288D2D823960397C964A7D360C79F38AD840CFA27C312530EDD9097B89C A51950A477E16CFE86E8429166DFBA72 Key-Arg : None Start Time: 1492755277 Timeout : 7200 (sec) Verify return code: 18 (self signed certificate) --- $ openssl s_client -connect google.com:443 -tls1 Loading 'screen' into random state - done CONNECTED(00000188) depth=2 /C=US/O=GeoTrust Inc./CN=GeoTrust Global CA verify error:num=20:unable to get local issuer certificate verify return:0 --- Certificate chain 0 s:/C=US/ST=California/L=Mountain View/O=Google Inc/CN=google.com i:/C=US/O=Google Inc/CN=Google Internet Authority G2 1 s:/C=US/O=Google Inc/CN=Google Internet Authority G2 i:/C=US/O=GeoTrust Inc./CN=GeoTrust Global CA 2 s:/C=US/O=GeoTrust Inc./CN=GeoTrust Global CA i:/C=US/O=Equifax/OU=Equifax Secure Certificate Authority --- Server certificate -----BEGIN CERTIFICATE----- MIIgkjCCH3qgAwIBAgIIPUHY0Fje+9UwDQYJKoZIhvcNAQELBQAwSTELMAkGA1UE BhMCVVMxEzARBgNVBAoTCkdvb2dsZSBJbmMxJTAjBgNVBAMTHEdvb2dsZSBJbnRl cm5ldCBBdXRob3JpdHkgRzIwHhcNMTcwNDEyMTMzMDAxWhcNMTcwNzA1MTMyODAw WjBkMQswCQYDVQQGEwJVUzETMBEGA1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwN TW91bnRhaW4gVmlldzETMBEGA1UECgwKR29vZ2xlIEluYzETMBEGA1UEAwwKZ29v Z2xlLmNvbTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBALef9Jnvrg0F 9KgR3b6/OP8C9k8kXK75uyiNi+E1p/rnfLetVdab8iryadM7Rzbn5tHPUEQDZW/I PBWC97vmA/DFKOBXkBvZJUppXHtchBellktHW/BtSqvMQW6QWAnHNsbcBWioUrd+ 9gI9MNPwQDECLU/dA4qfszn0XOd/ctyNKavbJH4HOm+arET/kmVA67SLccmDoSFf 5aIIJe8Kl5F1KZtn4AWEgcW8j00RKQpdNKrNwYOMrEYJ+C86RHFwNsocK+aRKGNv FbpifWXeBN170xxN9rjjXBobCKy6Z56+qZEwQTXIhW7s0yXpI6AXfZfZAqdJGs29 nADFSLgJttkCAwEAAaOCHWEwgh1dMB0GA1UdJQQWMBQGCCsGAQUFBwMBBggrBgEF BQcDAjCCHC0GA1UdEQSCHCQwghwgggpnb29nbGUuY29tggoqLjJtZG4ubmV0gg0q 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AES128-SHA Server public key is 2048 bit Compression: NONE Expansion: NONE SSL-Session: Protocol : TLSv1 Cipher : AES128-SHA Session-ID: Session-ID-ctx: Master-Key: BA2CBFF9CC73E8D62838CBB95F681DB9CFDBD58443668486245DEDB571C8B6EC 3B72E90BB7A35B6E78B6B09E31A27F8B Key-Arg : None TLS session ticket lifetime hint: 100800 (seconds) TLS session ticket: 0000 - 52 ec 05 c8 ac 58 4c be-9f e7 df b7 5f db 2e 87 R....XL....._... 0010 - 8b c3 f2 18 31 43 e6 4c-63 de 0a 5d fa 0d 71 6b ....1C.Lc..]..qk 0020 - 56 8e c2 fe 98 db 25 b2-f1 66 a6 fa 39 86 1c b0 V.....%..f..9... 0030 - 04 de bb ba 82 20 f8 02-73 c8 a9 05 b0 ba 3b 85 ..... ..s.....;. 0040 - 12 dd ad bb 7d 1a 8d 5b-c3 35 0f 93 6e 8b 96 e2 ....}..[.5..n... 0050 - 0a 52 ab c1 f0 3d 77 3a-1b bd 45 cf 4a 7e 00 68 .R...=w:..E.J~.h 0060 - 6f 06 e4 9e a1 e4 1c a3-79 e7 87 5c 3c c4 11 f7 o.......y..\<... 0070 - 2f d8 95 cf 1b 79 1a 8a-b1 2d 27 5a 6e 3a 5d 90 /....y...-'Zn:]. 0080 - 6b 5e a8 37 a9 61 06 df-54 4d 35 f0 2c d7 bd ae k^.7.a..TM5.,... 0090 - 53 19 54 00 05 0b 94 ab-b3 86 e3 21 6d dd 87 5c S.T........!m..\ 00a0 - 79 a4 bb 75 y..u Start Time: 1492755701 Timeout : 7200 (sec) Verify return code: 20 (unable to get local issuer certificate) ---

SSL Cipher값이 

localhost는 DHE-RSA-AES128-SHA이지만, 

google은 AES128-SHA이다.

Tomcat server.xml에서 AES128-SHA 지원하도록 설정해보자.

<Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true" maxThreads="150" scheme="https" secure="true" keystoreFile="${user.home}/aa.keystore" keystorePass="121212" clientAuth="false" sslProtocol="TLS" ciphers="TLS_RSA_WITH_AES_128_CBC_SHA"/>

Tomcat ciphers 값은 추천 암호화 목록이 있으니 참고해 보기

다시 테스트 코드 실행해 보기

www: responsed data len:134 UnityWebRequest: responsed data len:134 HttpWebRequest: responsed data len:134

모두 잘 받았다.

핸드쉐이킹 과정에서, 클라와 서버 모두 사용 가능한 암호기법이 있어야 했다.

유니티 모노버전이 낮아서 지원하는 암호기법이 한정적이었다.

뭐 어쨋든 성공!!

이번에는 서버에서 잘 받았는지 확인해 보자.

SpringFramework 기본 MVC이며, 

POST, PUT 두 가지로 BODY데이터를 받도록 했고, 받은 BODY길이를 로그로 찍었다.

@RequestMapping(value = "/", method = RequestMethod.POST) public String home(HttpServletRequest request, HttpServletResponse response, @RequestBody byte[] body) throws IOException { logger.info("post:" + body.length); return "home"; } @RequestMapping(value = "/", method = RequestMethod.PUT) public String homePut(HttpServletRequest request, HttpServletResponse response, @RequestBody byte[] body) throws IOException { logger.info("put:" + body.length); return "home"; }

서버 로그

INFO : bluefin.net.hellomvc2.HomeController - post:7 INFO : bluefin.net.hellomvc2.HomeController - post:7 INFO : bluefin.net.hellomvc2.HomeController - post:2

어라? 클라에서는 분명 new byte[]{61, 61}로 만들어 2바이트만 Body로 보냈다.

디버깅 결과 post:7을 남긴 녀석들은 WWW과 UnityWebRequest였다.

서버가 받은 데이터를 아스키문자로 변환하면 "%3E%3E="이다.

URLENCODE도 아니고 BASE64도 아니고 뭔지 모르겠다^^

스트링을 컨버전하는 사이트에서 확인해 봤는데, URLENCODE로 하는게 가장 비슷하게 나왔다.

문제는 WWW와 UnityWebRequest는 POST로 문자열만 보낼 수 있다.

바이너리 데이터를 보내고 싶었다.

UnityWebRequest에는 다행히 PUT으로 바이너리로 보낼 수 있었다.

테스트 결과는 put:2를 잘 남겼다.

http body에 바이너리를 담으려면, UnityWebRequest.PUT 또는 HttpWebRequest를 사용해야 한다.

간만에 긴 글을 작성했다.

시작은 HTTPS 통신이었고, 통신이 되면서 바이너리 통신을 해봤다, 결과는 휴 힘들었다^^

도움 되시길~