Allowing Java to use an untrusted certificate for SSL HTTPS connection

Question

I ve been working on a program to extract information from a dynamic web application  and the program worked fine until I set my tomcat server to use SSL using a self-signed thus  untrusted  certificate  The stack trace of the error is   javax net ssl SSLHandshakeException  sun security validator ValidatorException  PKIX path building failed  sun security provider certpath SunCertPathBuilderException  unable to find valid certification path to requested target Error  sun security validator ValidatorException  PKIX path building failed  sun security provider certpath SunCertPathBuilderException  unable to find valid certification path to requested target         at com sun net ssl internal ssl Alerts getSSLException Alerts java 150          at com sun net ssl internal ssl SSLSocketImpl fatal SSLSocketImpl java 1584          at com sun net ssl internal ssl Handshaker fatalSE Handshaker java 174          at com sun net ssl internal ssl Handshaker fatalSE Handshaker java 168          at com sun net ssl internal ssl ClientHandshaker serverCertificate ClientHandshaker java 848          at com sun net ssl internal ssl ClientHandshaker processMessage ClientHandshaker java 106          at com sun net ssl internal ssl Handshaker processLoop Handshaker java 495          at com sun net ssl internal ssl Handshaker process record Handshaker java 433          at com sun net ssl internal ssl SSLSocketImpl readRecord SSLSocketImpl java 877          at com sun net ssl internal ssl SSLSocketImpl performInitialHandshake SSLSocketImpl java 1089          at com sun net ssl internal ssl SSLSocketImpl startHandshake SSLSocketImpl java 1116          at com sun net ssl internal ssl SSLSocketImpl startHandshake SSLSocketImpl java 1100          at sun net www protocol https HttpsClient afterConnect HttpsClient java 402          at sun net www protocol https AbstractDelegateHttpsURLConnection connect AbstractDelegateHttpsURLConnection java 170          at sun net www protocol http HttpURLConnection getOutputStream HttpURLConnection java 857          at sun net www protocol https HttpsURLConnectionImpl getOutputStream HttpsURLConnectionImpl java 230          at com certicom gls glscs nongui URLReader PostURL setupURL URLReader java 34          at com certicom gls glscs nongui URLReader getLogin URLReader java 227          at com certicom gls glscs nongui URLReader testLogin URLReader java 436          at com certicom gls glscs nongui Controller loginMenu Controller java 384          at com certicom gls glscs nongui Controller menu Controller java 324          at com certicom gls glscs nongui Controller  lt init gt  Controller java 49          at com certicom gls glscs nongui Controller main Controller java 61    In a web browser  the user is prompted a warning when accessing a HTTPS site with an untrusted certificate  and asked to make an exception if he likes to proceed  I would like to implement a similar functionality for my command-line application    I admit that I am new to socket programming and networking in general  any advice solving this problem will be great

User · Accepted Answer

Here is some relevant code      Create a trust manager that does not validate certificate chains TrustManager   trustAllCerts   new TrustManager        new X509TrustManager             public java security cert X509Certificate   getAcceptedIssuers                 return null                    public void checkClientTrusted              java security cert X509Certificate   certs  String authType                      public void checkServerTrusted              java security cert X509Certificate   certs  String authType                           Install the all-trusting trust manager try       SSLContext sc   SSLContext getInstance  SSL        sc init null  trustAllCerts  new java security SecureRandom         HttpsURLConnection setDefaultSSLSocketFactory sc getSocketFactory       catch  Exception e          Now you can access an https URL without having the certificate in the truststore try       URL url   new URL  https   hostname index html      catch  MalformedURLException e        This will completely disable SSL checking   just don t learn exception handling from such code   To do what you want  you would have to implement a check in your TrustManager that prompts the user

User · Answer

Another option is to get a   pem   public key  file for that particular server  and install it locally into the heart of your JRE s  cacerts  file  use the keytool helper application   then it will be able to download from that server without complaint  without compromising the entire SSL structure of your running JVM and enabling download from other unknown cert servers

User · Answer

Following code from here is a useful solution  No keystores etc  Just call method SSLUtilities trustAllHttpsCertificates   before initializing the service and port  in SOAP    import java security GeneralSecurityException  import java security SecureRandom  import java security cert X509Certificate  import javax net ssl HostnameVerifier  import javax net ssl HttpsURLConnection  import javax net ssl SSLContext  import javax net ssl TrustManager  import javax net ssl X509TrustManager          This class provide various static methods that relax X509 certificate and    hostname verification while using the SSL over the HTTP protocol           author Jiramot info     public final class SSLUtilities               Hostname verifier for the Sun s deprecated API             deprecated see   link   hostnameVerifier           private static com sun net ssl HostnameVerifier   hostnameVerifier             Thrust managers for the Sun s deprecated API             deprecated see   link   trustManagers           private static com sun net ssl TrustManager     trustManagers             Hostname verifier          private static HostnameVerifier  hostnameVerifier             Thrust managers          private static TrustManager    trustManagers              Set the default Hostname Verifier to an instance of a fake class that      trust all hostnames  This method uses the old deprecated API from the      com sun ssl package               deprecated see   link   trustAllHostnames             private static void   trustAllHostnames            Create a trust manager that does not validate certificate chains     if    hostnameVerifier    null              hostnameVerifier   new SSLUtilities  FakeHostnameVerifier             if        Install the all-trusting host name verifier     com sun net ssl HttpsURLConnection              setDefaultHostnameVerifier   hostnameVerifier            trustAllHttpsCertificates             Set the default X509 Trust Manager to an instance of a fake class that      trust all certificates  even the self-signed ones  This method uses the      old deprecated API from the com sun ssl package             deprecated see   link   trustAllHttpsCertificates             private static void   trustAllHttpsCertificates         com sun net ssl SSLContext context          Create a trust manager that does not validate certificate chains     if    trustManagers    null              trustManagers   new com sun net ssl TrustManager   new SSLUtilities  FakeX509TrustManager              if        Install the all-trusting trust manager     try           context   com sun net ssl SSLContext getInstance  SSL            context init null    trustManagers  new SecureRandom           catch  GeneralSecurityException gse            throw new IllegalStateException gse getMessage              catch     com sun net ssl HttpsURLConnection setDefaultSSLSocketFactory context              getSocketFactory              trustAllHttpsCertificates             Return true if the protocol handler property java  protocol handler pkgs      is set to the Sun s com sun net ssl  internal www protocol deprecated      one  false otherwise             return true if the protocol handler property is set to the Sun s      deprecated one  false otherwise          private static boolean isDeprecatedSSLProtocol         return   com sun net ssl internal www protocol  equals System              getProperty  java protocol handler pkgs             isDeprecatedSSLProtocol             Set the default Hostname Verifier to an instance of a fake class that      trust all hostnames          private static void  trustAllHostnames              Create a trust manager that does not validate certificate chains       if   hostnameVerifier    null               hostnameVerifier   new SSLUtilities FakeHostnameVerifier               if          Install the all-trusting host name verifier        HttpsURLConnection setDefaultHostnameVerifier  hostnameVerifier           trustAllHttpsCertificates             Set the default X509 Trust Manager to an instance of a fake class that      trust all certificates  even the self-signed ones          private static void  trustAllHttpsCertificates         SSLContext context            Create a trust manager that does not validate certificate chains       if   trustManagers    null               trustManagers   new TrustManager   new SSLUtilities FakeX509TrustManager                if          Install the all-trusting trust manager        try             context   SSLContext getInstance  SSL              context init null   trustManagers  new SecureRandom             catch  GeneralSecurityException gse              throw new IllegalStateException gse getMessage                catch       HttpsURLConnection setDefaultSSLSocketFactory context              getSocketFactory             trustAllHttpsCertificates             Set the default Hostname Verifier to an instance of a fake class that      trust all hostnames          public static void trustAllHostnames              Is the deprecated protocol setted        if  isDeprecatedSSLProtocol                  trustAllHostnames            else              trustAllHostnames               else        trustAllHostnames             Set the default X509 Trust Manager to an instance of a fake class that      trust all certificates  even the self-signed ones          public static void trustAllHttpsCertificates            Is the deprecated protocol setted      if  isDeprecatedSSLProtocol                trustAllHttpsCertificates          else            trustAllHttpsCertificates             else        trustAllHttpsCertificates             This class implements a fake hostname verificator  trusting any host      name  This class uses the old deprecated API from the com sun  ssl      package             author Jiramot info            deprecated see   link SSLUtilities FakeHostnameVerifier           public static class  FakeHostnameVerifier implements         com sun net ssl HostnameVerifier                   Always return true  indicating that the host name is an acceptable        match with the server s authentication scheme                 param hostname the host name          param session the SSL session used on the connection to host          return the true boolean value indicating the host name is trusted              public boolean verify String hostname  String session            return  true            verify         FakeHostnameVerifier             This class allow any X509 certificates to be used to authenticate the      remote side of a secure socket  including self-signed certificates  This      class uses the old deprecated API from the com sun ssl package             author Jiramot info            deprecated see   link SSLUtilities FakeX509TrustManager           public static class  FakeX509TrustManager implements         com sun net ssl X509TrustManager                   Empty array of certificate authority certificates              private static final X509Certificate    AcceptedIssuers   new X509Certificate                      Always return true  trusting for client SSL chain peer certificate        chain                 param chain the peer certificate chain          return the true boolean value indicating the chain is trusted              public boolean isClientTrusted X509Certificate   chain            return  true            checkClientTrusted                 Always return true  trusting for server SSL chain peer certificate        chain                 param chain the peer certificate chain          return the true boolean value indicating the chain is trusted              public boolean isServerTrusted X509Certificate   chain            return  true            checkServerTrusted                 Return an empty array of certificate authority certificates which are        trusted for authenticating peers                 return a empty array of issuer certificates              public X509Certificate   getAcceptedIssuers             return   AcceptedIssuers            getAcceptedIssuers         FakeX509TrustManager             This class implements a fake hostname verificator  trusting any host      name             author Jiramot info         public static class FakeHostnameVerifier implements HostnameVerifier                   Always return true  indicating that the host name is an acceptable        match with the server s authentication scheme                 param hostname the host name          param session the SSL session used on the connection to host          return the true boolean value indicating the host name is trusted              public boolean verify String hostname  javax net ssl SSLSession session            return  true            verify        FakeHostnameVerifier             This class allow any X509 certificates to be used to authenticate the      remote side of a secure socket  including self-signed certificates             author Jiramot info         public static class FakeX509TrustManager implements X509TrustManager                   Empty array of certificate authority certificates              private static final X509Certificate    AcceptedIssuers   new X509Certificate                      Always trust for client SSL chain peer certificate chain with any        authType authentication types                 param chain the peer certificate chain          param authType the authentication type based on the client        certificate              public void checkClientTrusted X509Certificate   chain  String authType             checkClientTrusted                 Always trust for server SSL chain peer certificate chain with any        authType exchange algorithm types                 param chain the peer certificate chain          param authType the key exchange algorithm used              public void checkServerTrusted X509Certificate   chain  String authType             checkServerTrusted                 Return an empty array of certificate authority certificates which are        trusted for authenticating peers                 return a empty array of issuer certificates              public X509Certificate   getAcceptedIssuers             return   AcceptedIssuers            getAcceptedIssuers        FakeX509TrustManager      SSLUtilities

[java] Allowing Java to use an untrusted certificate for SSL/HTTPS connection

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