sun.security.jgss.GSSManagerImpl Java Examples

The following examples show how to use sun.security.jgss.GSSManagerImpl. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: NegotiatorImpl.java    From dragonwell8_jdk with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Initialize the object, which includes:<ul>
 * <li>Find out what GSS mechanism to use from the system property
 * <code>http.negotiate.mechanism.oid</code>, defaults SPNEGO
 * <li>Creating the GSSName for the target host, "HTTP/"+hostname
 * <li>Creating GSSContext
 * <li>A first call to initSecContext</ul>
 */
private void init(HttpCallerInfo hci) throws GSSException {
    final Oid oid;

    if (hci.scheme.equalsIgnoreCase("Kerberos")) {
        // we can only use Kerberos mech when the scheme is kerberos
        oid = GSSUtil.GSS_KRB5_MECH_OID;
    } else {
        String pref = java.security.AccessController.doPrivileged(
                new java.security.PrivilegedAction<String>() {
                    public String run() {
                        return System.getProperty(
                            "http.auth.preference",
                            "spnego");
                    }
                });
        if (pref.equalsIgnoreCase("kerberos")) {
            oid = GSSUtil.GSS_KRB5_MECH_OID;
        } else {
            // currently there is no 3rd mech we can use
            oid = GSSUtil.GSS_SPNEGO_MECH_OID;
        }
    }

    GSSManagerImpl manager = new GSSManagerImpl(
            new HttpCaller(hci));

    // RFC 4559 4.1 uses uppercase service name "HTTP".
    // RFC 4120 6.2.1 demands the host be lowercase
    String peerName = "HTTP@" + hci.host.toLowerCase();

    GSSName serverName = manager.createName(peerName,
            GSSName.NT_HOSTBASED_SERVICE);
    context = manager.createContext(serverName,
                                    oid,
                                    null,
                                    GSSContext.DEFAULT_LIFETIME);

    // Always respect delegation policy in HTTP/SPNEGO.
    if (context instanceof ExtendedGSSContext) {
        ((ExtendedGSSContext)context).requestDelegPolicy(true);
    }
    oneToken = context.initSecContext(new byte[0], 0, 0);
}
Example #2
Source File: NegotiatorImpl.java    From TencentKona-8 with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Initialize the object, which includes:<ul>
 * <li>Find out what GSS mechanism to use from the system property
 * <code>http.negotiate.mechanism.oid</code>, defaults SPNEGO
 * <li>Creating the GSSName for the target host, "HTTP/"+hostname
 * <li>Creating GSSContext
 * <li>A first call to initSecContext</ul>
 */
private void init(HttpCallerInfo hci) throws GSSException {
    final Oid oid;

    if (hci.scheme.equalsIgnoreCase("Kerberos")) {
        // we can only use Kerberos mech when the scheme is kerberos
        oid = GSSUtil.GSS_KRB5_MECH_OID;
    } else {
        String pref = java.security.AccessController.doPrivileged(
                new java.security.PrivilegedAction<String>() {
                    public String run() {
                        return System.getProperty(
                            "http.auth.preference",
                            "spnego");
                    }
                });
        if (pref.equalsIgnoreCase("kerberos")) {
            oid = GSSUtil.GSS_KRB5_MECH_OID;
        } else {
            // currently there is no 3rd mech we can use
            oid = GSSUtil.GSS_SPNEGO_MECH_OID;
        }
    }

    GSSManagerImpl manager = new GSSManagerImpl(
            new HttpCaller(hci));

    // RFC 4559 4.1 uses uppercase service name "HTTP".
    // RFC 4120 6.2.1 demands the host be lowercase
    String peerName = "HTTP@" + hci.host.toLowerCase();

    GSSName serverName = manager.createName(peerName,
            GSSName.NT_HOSTBASED_SERVICE);
    context = manager.createContext(serverName,
                                    oid,
                                    null,
                                    GSSContext.DEFAULT_LIFETIME);

    // Always respect delegation policy in HTTP/SPNEGO.
    if (context instanceof ExtendedGSSContext) {
        ((ExtendedGSSContext)context).requestDelegPolicy(true);
    }
    oneToken = context.initSecContext(new byte[0], 0, 0);
}
Example #3
Source File: NegotiatorImpl.java    From jdk8u60 with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Initialize the object, which includes:<ul>
 * <li>Find out what GSS mechanism to use from the system property
 * <code>http.negotiate.mechanism.oid</code>, defaults SPNEGO
 * <li>Creating the GSSName for the target host, "HTTP/"+hostname
 * <li>Creating GSSContext
 * <li>A first call to initSecContext</ul>
 */
private void init(HttpCallerInfo hci) throws GSSException {
    final Oid oid;

    if (hci.scheme.equalsIgnoreCase("Kerberos")) {
        // we can only use Kerberos mech when the scheme is kerberos
        oid = GSSUtil.GSS_KRB5_MECH_OID;
    } else {
        String pref = java.security.AccessController.doPrivileged(
                new java.security.PrivilegedAction<String>() {
                    public String run() {
                        return System.getProperty(
                            "http.auth.preference",
                            "spnego");
                    }
                });
        if (pref.equalsIgnoreCase("kerberos")) {
            oid = GSSUtil.GSS_KRB5_MECH_OID;
        } else {
            // currently there is no 3rd mech we can use
            oid = GSSUtil.GSS_SPNEGO_MECH_OID;
        }
    }

    GSSManagerImpl manager = new GSSManagerImpl(
            new HttpCaller(hci));

    // RFC 4559 4.1 uses uppercase service name "HTTP".
    // RFC 4120 6.2.1 demands the host be lowercase
    String peerName = "HTTP@" + hci.host.toLowerCase();

    GSSName serverName = manager.createName(peerName,
            GSSName.NT_HOSTBASED_SERVICE);
    context = manager.createContext(serverName,
                                    oid,
                                    null,
                                    GSSContext.DEFAULT_LIFETIME);

    // Always respect delegation policy in HTTP/SPNEGO.
    if (context instanceof ExtendedGSSContext) {
        ((ExtendedGSSContext)context).requestDelegPolicy(true);
    }
    oneToken = context.initSecContext(new byte[0], 0, 0);
}
Example #4
Source File: NegotiatorImpl.java    From openjdk-jdk8u with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Initialize the object, which includes:<ul>
 * <li>Find out what GSS mechanism to use from the system property
 * <code>http.negotiate.mechanism.oid</code>, defaults SPNEGO
 * <li>Creating the GSSName for the target host, "HTTP/"+hostname
 * <li>Creating GSSContext
 * <li>A first call to initSecContext</ul>
 */
private void init(HttpCallerInfo hci) throws GSSException {
    final Oid oid;

    if (hci.scheme.equalsIgnoreCase("Kerberos")) {
        // we can only use Kerberos mech when the scheme is kerberos
        oid = GSSUtil.GSS_KRB5_MECH_OID;
    } else {
        String pref = java.security.AccessController.doPrivileged(
                new java.security.PrivilegedAction<String>() {
                    public String run() {
                        return System.getProperty(
                            "http.auth.preference",
                            "spnego");
                    }
                });
        if (pref.equalsIgnoreCase("kerberos")) {
            oid = GSSUtil.GSS_KRB5_MECH_OID;
        } else {
            // currently there is no 3rd mech we can use
            oid = GSSUtil.GSS_SPNEGO_MECH_OID;
        }
    }

    GSSManagerImpl manager = new GSSManagerImpl(
            new HttpCaller(hci));

    // RFC 4559 4.1 uses uppercase service name "HTTP".
    // RFC 4120 6.2.1 demands the host be lowercase
    String peerName = "HTTP@" + hci.host.toLowerCase();

    GSSName serverName = manager.createName(peerName,
            GSSName.NT_HOSTBASED_SERVICE);
    context = manager.createContext(serverName,
                                    oid,
                                    null,
                                    GSSContext.DEFAULT_LIFETIME);

    // Always respect delegation policy in HTTP/SPNEGO.
    if (context instanceof ExtendedGSSContext) {
        ((ExtendedGSSContext)context).requestDelegPolicy(true);
    }
    oneToken = context.initSecContext(new byte[0], 0, 0);
}
Example #5
Source File: NegotiatorImpl.java    From openjdk-jdk8u-backup with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Initialize the object, which includes:<ul>
 * <li>Find out what GSS mechanism to use from the system property
 * <code>http.negotiate.mechanism.oid</code>, defaults SPNEGO
 * <li>Creating the GSSName for the target host, "HTTP/"+hostname
 * <li>Creating GSSContext
 * <li>A first call to initSecContext</ul>
 */
private void init(HttpCallerInfo hci) throws GSSException {
    final Oid oid;

    if (hci.scheme.equalsIgnoreCase("Kerberos")) {
        // we can only use Kerberos mech when the scheme is kerberos
        oid = GSSUtil.GSS_KRB5_MECH_OID;
    } else {
        String pref = java.security.AccessController.doPrivileged(
                new java.security.PrivilegedAction<String>() {
                    public String run() {
                        return System.getProperty(
                            "http.auth.preference",
                            "spnego");
                    }
                });
        if (pref.equalsIgnoreCase("kerberos")) {
            oid = GSSUtil.GSS_KRB5_MECH_OID;
        } else {
            // currently there is no 3rd mech we can use
            oid = GSSUtil.GSS_SPNEGO_MECH_OID;
        }
    }

    GSSManagerImpl manager = new GSSManagerImpl(
            new HttpCaller(hci));

    // RFC 4559 4.1 uses uppercase service name "HTTP".
    // RFC 4120 6.2.1 demands the host be lowercase
    String peerName = "HTTP@" + hci.host.toLowerCase();

    GSSName serverName = manager.createName(peerName,
            GSSName.NT_HOSTBASED_SERVICE);
    context = manager.createContext(serverName,
                                    oid,
                                    null,
                                    GSSContext.DEFAULT_LIFETIME);

    // Always respect delegation policy in HTTP/SPNEGO.
    if (context instanceof ExtendedGSSContext) {
        ((ExtendedGSSContext)context).requestDelegPolicy(true);
    }
    oneToken = context.initSecContext(new byte[0], 0, 0);
}
Example #6
Source File: NegotiatorImpl.java    From openjdk-jdk9 with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Initialize the object, which includes:<ul>
 * <li>Find out what GSS mechanism to use from the system property
 * <code>http.negotiate.mechanism.oid</code>, defaults SPNEGO
 * <li>Creating the GSSName for the target host, "HTTP/"+hostname
 * <li>Creating GSSContext
 * <li>A first call to initSecContext</ul>
 */
private void init(HttpCallerInfo hci) throws GSSException {
    final Oid oid;

    if (hci.scheme.equalsIgnoreCase("Kerberos")) {
        // we can only use Kerberos mech when the scheme is kerberos
        oid = GSSUtil.GSS_KRB5_MECH_OID;
    } else {
        String pref = java.security.AccessController.doPrivileged(
                new java.security.PrivilegedAction<String>() {
                    public String run() {
                        return System.getProperty(
                            "http.auth.preference",
                            "spnego");
                    }
                });
        if (pref.equalsIgnoreCase("kerberos")) {
            oid = GSSUtil.GSS_KRB5_MECH_OID;
        } else {
            // currently there is no 3rd mech we can use
            oid = GSSUtil.GSS_SPNEGO_MECH_OID;
        }
    }

    GSSManagerImpl manager = new GSSManagerImpl(
            new HttpCaller(hci));

    // RFC 4559 4.1 uses uppercase service name "HTTP".
    // RFC 4120 6.2.1 demands the host be lowercase
    String peerName = "HTTP@" + hci.host.toLowerCase();

    GSSName serverName = manager.createName(peerName,
            GSSName.NT_HOSTBASED_SERVICE);
    context = manager.createContext(serverName,
                                    oid,
                                    null,
                                    GSSContext.DEFAULT_LIFETIME);

    // Always respect delegation policy in HTTP/SPNEGO.
    if (context instanceof GSSContextImpl) {
        ((GSSContextImpl)context).requestDelegPolicy(true);
    }
    oneToken = context.initSecContext(new byte[0], 0, 0);
}
Example #7
Source File: NegotiatorImpl.java    From jdk8u-jdk with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Initialize the object, which includes:<ul>
 * <li>Find out what GSS mechanism to use from the system property
 * <code>http.negotiate.mechanism.oid</code>, defaults SPNEGO
 * <li>Creating the GSSName for the target host, "HTTP/"+hostname
 * <li>Creating GSSContext
 * <li>A first call to initSecContext</ul>
 */
private void init(HttpCallerInfo hci) throws GSSException {
    final Oid oid;

    if (hci.scheme.equalsIgnoreCase("Kerberos")) {
        // we can only use Kerberos mech when the scheme is kerberos
        oid = GSSUtil.GSS_KRB5_MECH_OID;
    } else {
        String pref = java.security.AccessController.doPrivileged(
                new java.security.PrivilegedAction<String>() {
                    public String run() {
                        return System.getProperty(
                            "http.auth.preference",
                            "spnego");
                    }
                });
        if (pref.equalsIgnoreCase("kerberos")) {
            oid = GSSUtil.GSS_KRB5_MECH_OID;
        } else {
            // currently there is no 3rd mech we can use
            oid = GSSUtil.GSS_SPNEGO_MECH_OID;
        }
    }

    GSSManagerImpl manager = new GSSManagerImpl(
            new HttpCaller(hci));

    // RFC 4559 4.1 uses uppercase service name "HTTP".
    // RFC 4120 6.2.1 demands the host be lowercase
    String peerName = "HTTP@" + hci.host.toLowerCase();

    GSSName serverName = manager.createName(peerName,
            GSSName.NT_HOSTBASED_SERVICE);
    context = manager.createContext(serverName,
                                    oid,
                                    null,
                                    GSSContext.DEFAULT_LIFETIME);

    // Always respect delegation policy in HTTP/SPNEGO.
    if (context instanceof ExtendedGSSContext) {
        ((ExtendedGSSContext)context).requestDelegPolicy(true);
    }
    oneToken = context.initSecContext(new byte[0], 0, 0);
}
Example #8
Source File: NegotiatorImpl.java    From hottub with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Initialize the object, which includes:<ul>
 * <li>Find out what GSS mechanism to use from the system property
 * <code>http.negotiate.mechanism.oid</code>, defaults SPNEGO
 * <li>Creating the GSSName for the target host, "HTTP/"+hostname
 * <li>Creating GSSContext
 * <li>A first call to initSecContext</ul>
 */
private void init(HttpCallerInfo hci) throws GSSException {
    final Oid oid;

    if (hci.scheme.equalsIgnoreCase("Kerberos")) {
        // we can only use Kerberos mech when the scheme is kerberos
        oid = GSSUtil.GSS_KRB5_MECH_OID;
    } else {
        String pref = java.security.AccessController.doPrivileged(
                new java.security.PrivilegedAction<String>() {
                    public String run() {
                        return System.getProperty(
                            "http.auth.preference",
                            "spnego");
                    }
                });
        if (pref.equalsIgnoreCase("kerberos")) {
            oid = GSSUtil.GSS_KRB5_MECH_OID;
        } else {
            // currently there is no 3rd mech we can use
            oid = GSSUtil.GSS_SPNEGO_MECH_OID;
        }
    }

    GSSManagerImpl manager = new GSSManagerImpl(
            new HttpCaller(hci));

    // RFC 4559 4.1 uses uppercase service name "HTTP".
    // RFC 4120 6.2.1 demands the host be lowercase
    String peerName = "HTTP@" + hci.host.toLowerCase();

    GSSName serverName = manager.createName(peerName,
            GSSName.NT_HOSTBASED_SERVICE);
    context = manager.createContext(serverName,
                                    oid,
                                    null,
                                    GSSContext.DEFAULT_LIFETIME);

    // Always respect delegation policy in HTTP/SPNEGO.
    if (context instanceof ExtendedGSSContext) {
        ((ExtendedGSSContext)context).requestDelegPolicy(true);
    }
    oneToken = context.initSecContext(new byte[0], 0, 0);
}
Example #9
Source File: NegotiatorImpl.java    From openjdk-8-source with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Initialize the object, which includes:<ul>
 * <li>Find out what GSS mechanism to use from the system property
 * <code>http.negotiate.mechanism.oid</code>, defaults SPNEGO
 * <li>Creating the GSSName for the target host, "HTTP/"+hostname
 * <li>Creating GSSContext
 * <li>A first call to initSecContext</ul>
 */
private void init(HttpCallerInfo hci) throws GSSException {
    final Oid oid;

    if (hci.scheme.equalsIgnoreCase("Kerberos")) {
        // we can only use Kerberos mech when the scheme is kerberos
        oid = GSSUtil.GSS_KRB5_MECH_OID;
    } else {
        String pref = java.security.AccessController.doPrivileged(
                new java.security.PrivilegedAction<String>() {
                    public String run() {
                        return System.getProperty(
                            "http.auth.preference",
                            "spnego");
                    }
                });
        if (pref.equalsIgnoreCase("kerberos")) {
            oid = GSSUtil.GSS_KRB5_MECH_OID;
        } else {
            // currently there is no 3rd mech we can use
            oid = GSSUtil.GSS_SPNEGO_MECH_OID;
        }
    }

    GSSManagerImpl manager = new GSSManagerImpl(
            new HttpCaller(hci));

    // RFC 4559 4.1 uses uppercase service name "HTTP".
    // RFC 4120 6.2.1 demands the host be lowercase
    String peerName = "HTTP@" + hci.host.toLowerCase();

    GSSName serverName = manager.createName(peerName,
            GSSName.NT_HOSTBASED_SERVICE);
    context = manager.createContext(serverName,
                                    oid,
                                    null,
                                    GSSContext.DEFAULT_LIFETIME);

    // Always respect delegation policy in HTTP/SPNEGO.
    if (context instanceof ExtendedGSSContext) {
        ((ExtendedGSSContext)context).requestDelegPolicy(true);
    }
    oneToken = context.initSecContext(new byte[0], 0, 0);
}
Example #10
Source File: NegotiatorImpl.java    From openjdk-8 with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Initialize the object, which includes:<ul>
 * <li>Find out what GSS mechanism to use from the system property
 * <code>http.negotiate.mechanism.oid</code>, defaults SPNEGO
 * <li>Creating the GSSName for the target host, "HTTP/"+hostname
 * <li>Creating GSSContext
 * <li>A first call to initSecContext</ul>
 */
private void init(HttpCallerInfo hci) throws GSSException {
    final Oid oid;

    if (hci.scheme.equalsIgnoreCase("Kerberos")) {
        // we can only use Kerberos mech when the scheme is kerberos
        oid = GSSUtil.GSS_KRB5_MECH_OID;
    } else {
        String pref = java.security.AccessController.doPrivileged(
                new java.security.PrivilegedAction<String>() {
                    public String run() {
                        return System.getProperty(
                            "http.auth.preference",
                            "spnego");
                    }
                });
        if (pref.equalsIgnoreCase("kerberos")) {
            oid = GSSUtil.GSS_KRB5_MECH_OID;
        } else {
            // currently there is no 3rd mech we can use
            oid = GSSUtil.GSS_SPNEGO_MECH_OID;
        }
    }

    GSSManagerImpl manager = new GSSManagerImpl(
            new HttpCaller(hci));

    // RFC 4559 4.1 uses uppercase service name "HTTP".
    // RFC 4120 6.2.1 demands the host be lowercase
    String peerName = "HTTP@" + hci.host.toLowerCase();

    GSSName serverName = manager.createName(peerName,
            GSSName.NT_HOSTBASED_SERVICE);
    context = manager.createContext(serverName,
                                    oid,
                                    null,
                                    GSSContext.DEFAULT_LIFETIME);

    // Always respect delegation policy in HTTP/SPNEGO.
    if (context instanceof ExtendedGSSContext) {
        ((ExtendedGSSContext)context).requestDelegPolicy(true);
    }
    oneToken = context.initSecContext(new byte[0], 0, 0);
}
Example #11
Source File: NegotiatorImpl.java    From jdk8u_jdk with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Initialize the object, which includes:<ul>
 * <li>Find out what GSS mechanism to use from the system property
 * <code>http.negotiate.mechanism.oid</code>, defaults SPNEGO
 * <li>Creating the GSSName for the target host, "HTTP/"+hostname
 * <li>Creating GSSContext
 * <li>A first call to initSecContext</ul>
 */
private void init(HttpCallerInfo hci) throws GSSException {
    final Oid oid;

    if (hci.scheme.equalsIgnoreCase("Kerberos")) {
        // we can only use Kerberos mech when the scheme is kerberos
        oid = GSSUtil.GSS_KRB5_MECH_OID;
    } else {
        String pref = java.security.AccessController.doPrivileged(
                new java.security.PrivilegedAction<String>() {
                    public String run() {
                        return System.getProperty(
                            "http.auth.preference",
                            "spnego");
                    }
                });
        if (pref.equalsIgnoreCase("kerberos")) {
            oid = GSSUtil.GSS_KRB5_MECH_OID;
        } else {
            // currently there is no 3rd mech we can use
            oid = GSSUtil.GSS_SPNEGO_MECH_OID;
        }
    }

    GSSManagerImpl manager = new GSSManagerImpl(
            new HttpCaller(hci));

    // RFC 4559 4.1 uses uppercase service name "HTTP".
    // RFC 4120 6.2.1 demands the host be lowercase
    String peerName = "HTTP@" + hci.host.toLowerCase();

    GSSName serverName = manager.createName(peerName,
            GSSName.NT_HOSTBASED_SERVICE);
    context = manager.createContext(serverName,
                                    oid,
                                    null,
                                    GSSContext.DEFAULT_LIFETIME);

    // Always respect delegation policy in HTTP/SPNEGO.
    if (context instanceof ExtendedGSSContext) {
        ((ExtendedGSSContext)context).requestDelegPolicy(true);
    }
    oneToken = context.initSecContext(new byte[0], 0, 0);
}
Example #12
Source File: NegotiatorImpl.java    From jdk8u-jdk with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Initialize the object, which includes:<ul>
 * <li>Find out what GSS mechanism to use from the system property
 * <code>http.negotiate.mechanism.oid</code>, defaults SPNEGO
 * <li>Creating the GSSName for the target host, "HTTP/"+hostname
 * <li>Creating GSSContext
 * <li>A first call to initSecContext</ul>
 */
private void init(HttpCallerInfo hci) throws GSSException {
    final Oid oid;

    if (hci.scheme.equalsIgnoreCase("Kerberos")) {
        // we can only use Kerberos mech when the scheme is kerberos
        oid = GSSUtil.GSS_KRB5_MECH_OID;
    } else {
        String pref = java.security.AccessController.doPrivileged(
                new java.security.PrivilegedAction<String>() {
                    public String run() {
                        return System.getProperty(
                            "http.auth.preference",
                            "spnego");
                    }
                });
        if (pref.equalsIgnoreCase("kerberos")) {
            oid = GSSUtil.GSS_KRB5_MECH_OID;
        } else {
            // currently there is no 3rd mech we can use
            oid = GSSUtil.GSS_SPNEGO_MECH_OID;
        }
    }

    GSSManagerImpl manager = new GSSManagerImpl(
            new HttpCaller(hci));

    // RFC 4559 4.1 uses uppercase service name "HTTP".
    // RFC 4120 6.2.1 demands the host be lowercase
    String peerName = "HTTP@" + hci.host.toLowerCase();

    GSSName serverName = manager.createName(peerName,
            GSSName.NT_HOSTBASED_SERVICE);
    context = manager.createContext(serverName,
                                    oid,
                                    null,
                                    GSSContext.DEFAULT_LIFETIME);

    // Always respect delegation policy in HTTP/SPNEGO.
    if (context instanceof ExtendedGSSContext) {
        ((ExtendedGSSContext)context).requestDelegPolicy(true);
    }
    oneToken = context.initSecContext(new byte[0], 0, 0);
}
Example #13
Source File: NegotiatorImpl.java    From jdk8u-dev-jdk with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Initialize the object, which includes:<ul>
 * <li>Find out what GSS mechanism to use from the system property
 * <code>http.negotiate.mechanism.oid</code>, defaults SPNEGO
 * <li>Creating the GSSName for the target host, "HTTP/"+hostname
 * <li>Creating GSSContext
 * <li>A first call to initSecContext</ul>
 */
private void init(HttpCallerInfo hci) throws GSSException {
    final Oid oid;

    if (hci.scheme.equalsIgnoreCase("Kerberos")) {
        // we can only use Kerberos mech when the scheme is kerberos
        oid = GSSUtil.GSS_KRB5_MECH_OID;
    } else {
        String pref = java.security.AccessController.doPrivileged(
                new java.security.PrivilegedAction<String>() {
                    public String run() {
                        return System.getProperty(
                            "http.auth.preference",
                            "spnego");
                    }
                });
        if (pref.equalsIgnoreCase("kerberos")) {
            oid = GSSUtil.GSS_KRB5_MECH_OID;
        } else {
            // currently there is no 3rd mech we can use
            oid = GSSUtil.GSS_SPNEGO_MECH_OID;
        }
    }

    GSSManagerImpl manager = new GSSManagerImpl(
            new HttpCaller(hci));

    // RFC 4559 4.1 uses uppercase service name "HTTP".
    // RFC 4120 6.2.1 demands the host be lowercase
    String peerName = "HTTP@" + hci.host.toLowerCase();

    GSSName serverName = manager.createName(peerName,
            GSSName.NT_HOSTBASED_SERVICE);
    context = manager.createContext(serverName,
                                    oid,
                                    null,
                                    GSSContext.DEFAULT_LIFETIME);

    // Always respect delegation policy in HTTP/SPNEGO.
    if (context instanceof ExtendedGSSContext) {
        ((ExtendedGSSContext)context).requestDelegPolicy(true);
    }
    oneToken = context.initSecContext(new byte[0], 0, 0);
}