Support for cert.pem files that contain multiple certificates #294
Description
If you are not working with self-signed certificates, it is possible that your cert.pem file contains a certificate chain. The current code only reads in the first certificate from the file which can lead to a SSLHandshakeException when connecting to a remote docker host.
javax.ws.rs.ProcessingException: javax.net.ssl.SSLHandshakeException: Received fatal alert: bad_certificate
at com.github.dockerjava.jaxrs.connector.ApacheConnector.apply(ApacheConnector.java:490) ~[docker-java-2.0.0.jar:na]
at org.glassfish.jersey.client.ClientRuntime.invoke(ClientRuntime.java:246) ~[jersey-client-2.11.jar:na]
at org.glassfish.jersey.client.JerseyInvocation$1.call(JerseyInvocation.java:667) ~[jersey-client-2.11.jar:na]
at org.glassfish.jersey.client.JerseyInvocation$1.call(JerseyInvocation.java:664) ~[jersey-client-2.11.jar:na]
at org.glassfish.jersey.internal.Errors.process(Errors.java:315) ~[jersey-common-2.11.jar:na]
at org.glassfish.jersey.internal.Errors.process(Errors.java:297) ~[jersey-common-2.11.jar:na]
at org.glassfish.jersey.internal.Errors.process(Errors.java:228) ~[jersey-common-2.11.jar:na]
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:424) ~[jersey-common-2.11.jar:na]
at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:664) ~[jersey-client-2.11.jar:na]
at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:399) ~[jersey-client-2.11.jar:na]
at org.glassfish.jersey.client.JerseyInvocation$Builder.get(JerseyInvocation.java:303) ~[jersey-client-2.11.jar:na]
at com.github.dockerjava.jaxrs.PingCmdExec.execute(PingCmdExec.java:23) ~[docker-java-2.0.0.jar:na]
at com.github.dockerjava.jaxrs.PingCmdExec.execute(PingCmdExec.java:10) ~[docker-java-2.0.0.jar:na]
at com.github.dockerjava.jaxrs.AbstrSyncDockerCmdExec.exec(AbstrSyncDockerCmdExec.java:24) ~[docker-java-2.0.0.jar:na]
at com.github.dockerjava.core.command.AbstrDockerCmd.exec(AbstrDockerCmd.java:33) ~[docker-java-2.0.0.jar:na]
........
Caused by: javax.net.ssl.SSLHandshakeException: Received fatal alert: bad_certificate
at sun.security.ssl.Alerts.getSSLException(Alerts.java:192) ~[na:1.8.0_31]
at sun.security.ssl.Alerts.getSSLException(Alerts.java:154) ~[na:1.8.0_31]
at sun.security.ssl.SSLSocketImpl.recvAlert(SSLSocketImpl.java:2011) ~[na:1.8.0_31]
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1113) ~[na:1.8.0_31]
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1363) ~[na:1.8.0_31]
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1391) ~[na:1.8.0_31]
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1375) ~[na:1.8.0_31]
at org.apache.http.conn.ssl.SSLConnectionSocketFactory.createLayeredSocket(SSLConnectionSocketFactory.java:275) ~[okta-agent.base-02.00.00-000110.7b82943.jar:na]
at org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSLConnectionSocketFactory.java:254) ~[okta-agent.base-02.00.00-000110.7b82943.jar:na]
at org.apache.http.impl.conn.HttpClientConnectionOperator.connect(HttpClientConnectionOperator.java:123) ~[okta-agent.base-02.00.00-000110.7b82943.jar:na]
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:318) ~[okta-agent.base-02.00.00-000110.7b82943.jar:na]
at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:363) ~[okta-agent.base-02.00.00-000110.7b82943.jar:na]
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:219) ~[okta-agent.base-02.00.00-000110.7b82943.jar:na]
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:195) ~[okta-agent.base-02.00.00-000110.7b82943.jar:na]
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:86) ~[okta-agent.base-02.00.00-000110.7b82943.jar:na]
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:108) ~[okta-agent.base-02.00.00-000110.7b82943.jar:na]
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184) ~[okta-agent.base-02.00.00-000110.7b82943.jar:na]
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:72) ~[okta-agent.base-02.00.00-000110.7b82943.jar:na]
at com.github.dockerjava.jaxrs.connector.ApacheConnector.apply(ApacheConnector.java:443) ~[docker-java-2.0.0.jar:na]
... 24 common frames omitted