Java SSLException hostname in certificate didn t match

Question

I have been using the following code to connect to one of google s service  This code worked fine on my local machine    HttpClient client new DefaultHttpClient    HttpPost post   new HttpPost  https   www google com accounts ClientLogin    post setEntity new UrlEncodedFormEntity myData    HttpResponse response   client execute post     I put this code in a production environment  which had blocked Google com  On request  they allowed communication with Google server by allowing me to accessing an IP   74 125 236 52 - which is one of Google s IPs  I edited my hosts file to add this entry too   Still I could not access the URL  which I wonder why  So I replaced the above code with    HttpPost post   new HttpPost  https   74 125 236 52 accounts ClientLogin      Now I get an error like this       javax net ssl SSLException  hostname in certificate didn t match     lt 74 125 236 52 gt      lt www google com gt    I guess this is because Google has multiple IPs  I cant ask the network admin to allow me access to all those IPs - I may not even get this entire list    What should I do now   Is there a workaround at Java level   Or is it totally in hands of the network guy

User · Answer

You can also try to set a HostnameVerifier as described here  This worked for me to avoid this error       Do not do this in production    HostnameVerifier hostnameVerifier   org apache http conn ssl SSLSocketFactory ALLOW ALL HOSTNAME VERIFIER   DefaultHttpClient client   new DefaultHttpClient     SchemeRegistry registry   new SchemeRegistry    SSLSocketFactory socketFactory   SSLSocketFactory getSocketFactory    socketFactory setHostnameVerifier  X509HostnameVerifier  hostnameVerifier   registry register new Scheme  https   socketFactory  443    SingleClientConnManager mgr   new SingleClientConnManager client getParams    registry   DefaultHttpClient httpClient   new DefaultHttpClient mgr  client getParams         Set verifier      HttpsURLConnection setDefaultHostnameVerifier hostnameVerifier       Example send http request final String url    https   encrypted google com      HttpPost httpPost   new HttpPost url   HttpResponse response   httpClient execute httpPost

User · Answer

Thanks Vineet Reynolds  The link you provided held a lot of user comments - one of which I tried in desperation and it helped  I added this method       Do not do this in production    HttpsURLConnection setDefaultHostnameVerifier  new HostnameVerifier        public boolean verify String string SSLSession ssls            return true              This seems fine for me now  though I know this solution is temporary  I am working with the network people to identify why my hosts file is being ignored

User · Answer

In httpclient-4 3 3 jar  there is another HttpClient to use   public static void main  String   args  throws Exception          org apache http client HttpClient client   new DefaultHttpClient        org apache http client HttpClient client   HttpClientBuilder create   build        System out println  HttpClient       client getClass   toString         org apache http client methods HttpPost post   new HttpPost  https   www rideforrainbows org         org apache http HttpResponse response   client execute post       java io InputStream is   response getEntity   getContent        java io BufferedReader rd   new java io BufferedReader new java io InputStreamReader is        String line      while   line   rd readLine       null             System out println line             This HttpClientBuilder create   build   will return org apache http impl client InternalHttpClient  It can handle the this hostname in certificate didn t match issue

User · Answer

Updating the java version from 1 8 0 40 to 1 8 0 181 resolved the issue

User · Answer

The certificate verification process will always verify the DNS name of the certificate presented by the server  with the hostname of the server in the URL used by the client   The following code  HttpPost post   new HttpPost  https   74 125 236 52 accounts ClientLogin      will result in the certificate verification process verifying whether the common name of the certificate issued by the server  i e  www google com matches the hostname i e  74 125 236 52  Obviously  this is bound to result in failure  you could have verified this by browsing to the URL https   74 125 236 52 accounts ClientLogin with a browser  and seen the resulting error yourself    Supposedly  for the sake of security  you are hesitant to write your own TrustManager  and you musn t unless you understand how to write a secure one   you ought to look at establishing DNS records in your datacenter to ensure that all lookups to www google com will resolve to 74 125 236 52  this ought to be done either in your local DNS servers or in the hosts file of your OS  you might need to add entries to other domains as well  Needless to say  you will need to ensure that this is consistent with the records returned by your ISP

User · Answer

The concern is we should not use ALLOW ALL HOSTNAME VERIFIER   How about I implement my own hostname verifier   class MyHostnameVerifier implements org apache http conn ssl X509HostnameVerifier        Override     public boolean verify String host  SSLSession session            String sslHost   session getPeerHost            System out println  Host     host           System out println  SSL Host     sslHost               if  host equals sslHost                 return true            else               return false                        Override     public void verify String host  SSLSocket ssl  throws IOException           String sslHost   ssl getInetAddress   getHostName            System out println  Host     host           System out println  SSL Host     sslHost               if  host equals sslHost                 return            else               throw new IOException  hostname in certificate didn t match      host            sslHost                         Override     public void verify String host  X509Certificate cert  throws SSLException           throw new SSLException  Hostname verification 1 not implemented                Override     public void verify String host  String   cns  String   subjectAlts  throws SSLException           throw new SSLException  Hostname verification 2 not implemented              Let s test against https   www rideforrainbows org  which is hosted on a shared server   public static void main  String   args  throws Exception         org apache http conn ssl SSLSocketFactory sf   org apache http conn ssl SSLSocketFactory getSocketFactory          sf setHostnameVerifier new MyHostnameVerifier           org apache http conn scheme Scheme sch   new Scheme  https   443  sf        org apache http client HttpClient client   new DefaultHttpClient          client getConnectionManager   getSchemeRegistry   register sch       org apache http client methods HttpPost post   new HttpPost  https   www rideforrainbows org         org apache http HttpResponse response   client execute post       java io InputStream is   response getEntity   getContent        java io BufferedReader rd   new java io BufferedReader new java io InputStreamReader is        String line      while   line   rd readLine       null             System out println line             SSLException      Exception in thread  main  javax net ssl SSLException  hostname in certificate didn t match  www rideforrainbows org    stac rt sg OR stac rt sg OR www stac rt sg     at org apache http conn ssl AbstractVerifier verify AbstractVerifier java 231          Do with MyHostnameVerifier   public static void main  String   args  throws Exception       org apache http conn ssl SSLSocketFactory sf   org apache http conn ssl SSLSocketFactory getSocketFactory        sf setHostnameVerifier new MyHostnameVerifier         org apache http conn scheme Scheme sch   new Scheme  https   443  sf        org apache http client HttpClient client   new DefaultHttpClient        client getConnectionManager   getSchemeRegistry   register sch       org apache http client methods HttpPost post   new HttpPost  https   www rideforrainbows org         org apache http HttpResponse response   client execute post       java io InputStream is   response getEntity   getContent        java io BufferedReader rd   new java io BufferedReader new java io InputStreamReader is        String line      while   line   rd readLine       null             System out println line             Shows      Host www rideforrainbows org   SSL Host www rideforrainbows org   At least I have the logic to compare  Host    SSL Host  and return true   The above source code is working for httpclient-4 2 3 jar and httpclient-4 3 3 jar

User · Answer

A cleaner approach   only for test environment  in httpcliet4 3 3 is as follows   SSLConnectionSocketFactory sslsf   new SSLConnectionSocketFactory sslContext SSLConnectionSocketFactory ALLOW ALL HOSTNAME VERIFIER    CloseableHttpClient httpclient   HttpClients custom   setSSLSocketFactory sslsf  build

User · Answer

I had similar problem  I was using Android s DefaultHttpClient  I have read that HttpsURLConnection can handle this kind of exception  So I created custom HostnameVerifier which uses the verifier from HttpsURLConnection  I also wrapped the implementation to custom HttpClient   public class CustomHttpClient extends DefaultHttpClient    public CustomHttpClient         super        SSLSocketFactory socketFactory   SSLSocketFactory getSocketFactory        socketFactory setHostnameVerifier new CustomHostnameVerifier         Scheme scheme    new Scheme  https   socketFactory  443        getConnectionManager   getSchemeRegistry   register scheme       Here is the CustomHostnameVerifier class   public class CustomHostnameVerifier implements org apache http conn ssl X509HostnameVerifier     Override public boolean verify String host  SSLSession session        HostnameVerifier hv   HttpsURLConnection getDefaultHostnameVerifier        return hv verify host  session       Override public void verify String host  SSLSocket ssl  throws IOException       Override public void verify String host  X509Certificate cert  throws SSLException        Override public void verify String host  String   cns  String   subjectAlts  throws SSLException

[java] Java SSLException: hostname in certificate didn't match

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