r19604: This is a massive commit, and I appologise in advance for it's size.

This merges Samba4 with lorikeet-heimdal, which itself has been
tracking Heimdal CVS for the past couple of weeks.

This is such a big change because Heimdal reorganised it's internal
structures, with the mechglue merge, and because many of our 'wishes' have been granted:  we now have DCE_STYLE GSSAPI, send_to_kdc hooks and many other features merged into the mainline code.  We have adapted to upstream's choice of API in these cases.

In gensec_gssapi and gensec_krb5, we either expect a valid PAC, or NO
PAC.  This matches windows behavour.  We also have an option to
require the PAC to be present (which allows us to automate the testing
of this code).

This also includes a restructure of how the kerberos dependencies are
handled, due to the fallout of the merge.

Andrew Bartlett
(This used to be commit 4826f1735197c2a471d771495e6d4c1051b4c471)

1 files changed, 789 insertions, 0 deletions

diff --git a/source4/heimdal/lib/gssapi/krb5/init_sec_context.c b/source4/heimdal/lib/gssapi/krb5/init_sec_context.c
new file mode 100644
index 0000000000..00f2543833
--- /dev/null
+++ b/source4/heimdal/lib/gssapi/krb5/init_sec_context.c
@@ -0,0 +1,789 @@
+/*
+ * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden). 
+ * All rights reserved. 
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions 
+ * are met: 
+ *
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright 
+ *    notice, this list of conditions and the following disclaimer in the 
+ *    documentation and/or other materials provided with the distribution. 
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors 
+ *    may be used to endorse or promote products derived from this software 
+ *    without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
+ * SUCH DAMAGE. 
+ */
+
+#include "krb5/gsskrb5_locl.h"
+
+RCSID("$Id: init_sec_context.c,v 1.72 2006/10/24 23:03:19 lha Exp $");
+
+/*
+ * copy the addresses from `input_chan_bindings' (if any) to
+ * the auth context `ac'
+ */
+
+static OM_uint32
+set_addresses (krb5_auth_context ac,
+	       const gss_channel_bindings_t input_chan_bindings)	       
+{
+    /* Port numbers are expected to be in application_data.value, 
+     * initator's port first */ 
+
+    krb5_address initiator_addr, acceptor_addr;
+    krb5_error_code kret;
+       
+    if (input_chan_bindings == GSS_C_NO_CHANNEL_BINDINGS
+	|| input_chan_bindings->application_data.length !=
+	2 * sizeof(ac->local_port))
+	return 0;
+
+    memset(&initiator_addr, 0, sizeof(initiator_addr));
+    memset(&acceptor_addr, 0, sizeof(acceptor_addr));
+       
+    ac->local_port =
+	*(int16_t *) input_chan_bindings->application_data.value;
+       
+    ac->remote_port =
+	*((int16_t *) input_chan_bindings->application_data.value + 1);
+       
+    kret = _gsskrb5i_address_to_krb5addr(input_chan_bindings->acceptor_addrtype,
+					 &input_chan_bindings->acceptor_address,
+					 ac->remote_port,
+					 &acceptor_addr);
+    if (kret)
+	return kret;
+           
+    kret = _gsskrb5i_address_to_krb5addr(input_chan_bindings->initiator_addrtype,
+					 &input_chan_bindings->initiator_address,
+					 ac->local_port,
+					 &initiator_addr);
+    if (kret) {
+	krb5_free_address (_gsskrb5_context, &acceptor_addr);
+	return kret;
+    }
+       
+    kret = krb5_auth_con_setaddrs(_gsskrb5_context,
+				  ac,
+				  &initiator_addr,  /* local address */
+				  &acceptor_addr);  /* remote address */
+       
+    krb5_free_address (_gsskrb5_context, &initiator_addr);
+    krb5_free_address (_gsskrb5_context, &acceptor_addr);
+       
+#if 0
+    free(input_chan_bindings->application_data.value);
+    input_chan_bindings->application_data.value = NULL;
+    input_chan_bindings->application_data.length = 0;
+#endif
+
+    return kret;
+}
+
+OM_uint32
+_gsskrb5_create_ctx(
+        OM_uint32 * minor_status,
+	gss_ctx_id_t * context_handle,
+ 	const gss_channel_bindings_t input_chan_bindings,
+ 	enum gss_ctx_id_t_state state)
+{
+    krb5_error_code kret;
+    gsskrb5_ctx ctx;
+
+    *context_handle = NULL;
+
+    ctx = malloc(sizeof(*ctx));
+    if (ctx == NULL) {
+	*minor_status = ENOMEM;
+	return GSS_S_FAILURE;
+    }
+    ctx->auth_context		= NULL;
+    ctx->source			= NULL;
+    ctx->target			= NULL;
+    ctx->state			= state;
+    ctx->flags			= 0;
+    ctx->more_flags		= 0;
+    ctx->service_keyblock	= NULL;
+    ctx->ticket			= NULL;
+    krb5_data_zero(&ctx->fwd_data);
+    ctx->lifetime		= GSS_C_INDEFINITE;
+    ctx->order			= NULL;
+    HEIMDAL_MUTEX_init(&ctx->ctx_id_mutex);
+
+    kret = krb5_auth_con_init (_gsskrb5_context, &ctx->auth_context);
+    if (kret) {
+	*minor_status = kret;
+	_gsskrb5_set_error_string ();
+
+	HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex);
+		
+	return GSS_S_FAILURE;
+    }
+
+    kret = set_addresses(ctx->auth_context, input_chan_bindings);
+    if (kret) {
+	*minor_status = kret;
+
+	HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex);
+
+	krb5_auth_con_free(_gsskrb5_context, ctx->auth_context);
+
+	return GSS_S_BAD_BINDINGS;
+    }
+
+    /*
+     * We need a sequence number
+     */
+
+    krb5_auth_con_addflags(_gsskrb5_context,
+			   ctx->auth_context,
+			   KRB5_AUTH_CONTEXT_DO_SEQUENCE |
+			   KRB5_AUTH_CONTEXT_CLEAR_FORWARDED_CRED,
+			   NULL);
+
+    *context_handle = (gss_ctx_id_t)ctx;
+
+    return GSS_S_COMPLETE;
+}
+
+
+static OM_uint32
+gsskrb5_get_creds(
+        OM_uint32 * minor_status,
+	krb5_ccache ccache,
+	gsskrb5_ctx ctx,
+	krb5_const_principal target_name,
+	OM_uint32 time_req,
+	OM_uint32 * time_rec,
+	krb5_creds ** cred)
+{
+    OM_uint32 ret;
+    krb5_error_code kret;
+    krb5_creds this_cred;
+    OM_uint32 lifetime_rec;
+
+    *cred = NULL;
+
+    memset(&this_cred, 0, sizeof(this_cred));
+    this_cred.client = ctx->source;
+    this_cred.server = ctx->target;
+
+    if (time_req && time_req != GSS_C_INDEFINITE) {
+	krb5_timestamp ts;
+
+	krb5_timeofday (_gsskrb5_context, &ts);
+	this_cred.times.endtime = ts + time_req;
+    } else {
+	this_cred.times.endtime   = 0;
+    }
+
+    this_cred.session.keytype = KEYTYPE_NULL;
+
+    kret = krb5_get_credentials(_gsskrb5_context,
+				0,
+				ccache,
+				&this_cred,
+				cred);
+    if (kret) {
+	_gsskrb5_set_error_string ();
+	*minor_status = kret;
+	return GSS_S_FAILURE;
+    }
+
+    ctx->lifetime = (*cred)->times.endtime;
+
+    ret = _gsskrb5_lifetime_left(minor_status, ctx->lifetime, &lifetime_rec);
+    if (ret) return ret;
+
+    if (lifetime_rec == 0) {
+	*minor_status = 0;
+	return GSS_S_CONTEXT_EXPIRED;
+    }
+
+    if (time_rec) *time_rec = lifetime_rec;
+
+    return GSS_S_COMPLETE;
+}
+
+static OM_uint32
+gsskrb5_initiator_ready(
+	OM_uint32 * minor_status,
+	gsskrb5_ctx ctx)
+{
+	OM_uint32 ret;
+	int32_t seq_number;
+	int is_cfx = 0;
+	OM_uint32 flags = ctx->flags;
+
+	krb5_auth_getremoteseqnumber (_gsskrb5_context,
+				      ctx->auth_context,
+				      &seq_number);
+
+	_gsskrb5i_is_cfx(ctx, &is_cfx);
+
+	ret = _gssapi_msg_order_create(minor_status,
+				       &ctx->order,
+				       _gssapi_msg_order_f(flags),
+				       seq_number, 0, is_cfx);
+	if (ret) return ret;
+
+	ctx->state	= INITIATOR_READY;
+	ctx->more_flags	|= OPEN;
+
+	return GSS_S_COMPLETE;
+}
+
+/*
+ * handle delegated creds in init-sec-context
+ */
+
+static void
+do_delegation (krb5_auth_context ac,
+	       krb5_ccache ccache,
+	       krb5_creds *cred,
+	       krb5_const_principal name,
+	       krb5_data *fwd_data,
+	       uint32_t *flags)
+{
+    krb5_creds creds;
+    KDCOptions fwd_flags;
+    krb5_error_code kret;
+       
+    memset (&creds, 0, sizeof(creds));
+    krb5_data_zero (fwd_data);
+       
+    kret = krb5_cc_get_principal(_gsskrb5_context, ccache, &creds.client);
+    if (kret) 
+	goto out;
+       
+    kret = krb5_build_principal(_gsskrb5_context,
+				&creds.server,
+				strlen(creds.client->realm),
+				creds.client->realm,
+				KRB5_TGS_NAME,
+				creds.client->realm,
+				NULL);
+    if (kret)
+	goto out; 
+       
+    creds.times.endtime = 0;
+       
+    memset(&fwd_flags, 0, sizeof(fwd_flags));
+    fwd_flags.forwarded = 1;
+    fwd_flags.forwardable = 1;
+       
+    if ( /*target_name->name.name_type != KRB5_NT_SRV_HST ||*/
+	name->name.name_string.len < 2) 
+	goto out;
+       
+    kret = krb5_get_forwarded_creds(_gsskrb5_context,
+				    ac,
+				    ccache,
+				    KDCOptions2int(fwd_flags),
+				    name->name.name_string.val[1],
+				    &creds,
+				    fwd_data);
+       
+ out:
+    if (kret)
+	*flags &= ~GSS_C_DELEG_FLAG;
+    else
+	*flags |= GSS_C_DELEG_FLAG;
+       
+    if (creds.client)
+	krb5_free_principal(_gsskrb5_context, creds.client);
+    if (creds.server)
+	krb5_free_principal(_gsskrb5_context, creds.server);
+}
+
+/*
+ * first stage of init-sec-context
+ */
+
+static OM_uint32
+init_auth
+(OM_uint32 * minor_status,
+ gsskrb5_cred initiator_cred_handle,
+ gsskrb5_ctx ctx,
+ krb5_const_principal name,
+ const gss_OID mech_type,
+ OM_uint32 req_flags,
+ OM_uint32 time_req,
+ const gss_channel_bindings_t input_chan_bindings,
+ const gss_buffer_t input_token,
+ gss_OID * actual_mech_type,
+ gss_buffer_t output_token,
+ OM_uint32 * ret_flags,
+ OM_uint32 * time_rec
+    )
+{
+    OM_uint32 ret = GSS_S_FAILURE;
+    krb5_error_code kret;
+    krb5_flags ap_options;
+    krb5_creds *cred = NULL;
+    krb5_data outbuf;
+    krb5_ccache ccache = NULL;
+    uint32_t flags;
+    krb5_data authenticator;
+    Checksum cksum;
+    krb5_enctype enctype;
+    krb5_data fwd_data;
+    OM_uint32 lifetime_rec;
+
+    krb5_data_zero(&outbuf);
+    krb5_data_zero(&fwd_data);
+
+    *minor_status = 0;
+
+    if (actual_mech_type)
+	*actual_mech_type = GSS_KRB5_MECHANISM;
+
+    if (initiator_cred_handle == NULL) {
+	kret = krb5_cc_default (_gsskrb5_context, &ccache);
+	if (kret) {
+	    _gsskrb5_set_error_string ();
+	    *minor_status = kret;
+	    ret = GSS_S_FAILURE;
+	    goto failure;
+	}
+    } else
+	ccache = initiator_cred_handle->ccache;
+
+    kret = krb5_cc_get_principal (_gsskrb5_context, ccache, &ctx->source);
+    if (kret) {
+	_gsskrb5_set_error_string ();
+	*minor_status = kret;
+	ret = GSS_S_FAILURE;
+	goto failure;
+    }
+
+    kret = krb5_copy_principal (_gsskrb5_context, name, &ctx->target);
+    if (kret) {
+	_gsskrb5_set_error_string ();
+	*minor_status = kret;
+	ret = GSS_S_FAILURE;
+	goto failure;
+    }
+
+    ret = _gss_DES3_get_mic_compat(minor_status, ctx);
+    if (ret)
+	goto failure;
+
+
+    ret = gsskrb5_get_creds(minor_status,
+			    ccache,
+			    ctx,
+			    ctx->target,
+			    time_req,
+			    time_rec,
+			    &cred);
+    if (ret)
+	goto failure;
+
+    ctx->lifetime = cred->times.endtime;
+
+    ret = _gsskrb5_lifetime_left(minor_status,
+			       ctx->lifetime,
+			       &lifetime_rec);
+    if (ret) {
+	goto failure;
+    }
+
+    if (lifetime_rec == 0) {
+	*minor_status = 0;
+	ret = GSS_S_CONTEXT_EXPIRED;
+	goto failure;
+    }
+
+    krb5_auth_con_setkey(_gsskrb5_context, 
+			 ctx->auth_context, 
+			 &cred->session);
+
+    kret = krb5_auth_con_generatelocalsubkey(_gsskrb5_context, 
+					     ctx->auth_context,
+					     &cred->session);
+    if(kret) {
+	_gsskrb5_set_error_string ();
+	*minor_status = kret;
+	ret = GSS_S_FAILURE;
+	goto failure;
+    }
+    
+    /* 
+     * If the credential doesn't have ok-as-delegate, check what local
+     * policy say about ok-as-delegate, default is FALSE that makes
+     * code ignore the KDC setting and follow what the application
+     * requested. If its TRUE, strip of the GSS_C_DELEG_FLAG if the
+     * KDC doesn't set ok-as-delegate.
+     */
+    if (!cred->flags.b.ok_as_delegate) {
+	krb5_boolean delegate;
+    
+	krb5_appdefault_boolean(_gsskrb5_context,
+				"gssapi", name->realm,
+				"ok-as-delegate", FALSE, &delegate);
+	if (delegate)
+	    req_flags &= ~GSS_C_DELEG_FLAG;
+    }
+
+    flags = 0;
+    ap_options = 0;
+    if (req_flags & GSS_C_DELEG_FLAG)
+	do_delegation (ctx->auth_context,
+		       ccache, cred, name, &fwd_data, &flags);
+    
+    if (req_flags & GSS_C_MUTUAL_FLAG) {
+	flags |= GSS_C_MUTUAL_FLAG;
+	ap_options |= AP_OPTS_MUTUAL_REQUIRED;
+    }
+    
+    if (req_flags & GSS_C_REPLAY_FLAG)
+	flags |= GSS_C_REPLAY_FLAG;
+    if (req_flags & GSS_C_SEQUENCE_FLAG)
+	flags |= GSS_C_SEQUENCE_FLAG;
+    if (req_flags & GSS_C_ANON_FLAG)
+	;                               /* XXX */
+    if (req_flags & GSS_C_DCE_STYLE) {
+	/* GSS_C_DCE_STYLE implies GSS_C_MUTUAL_FLAG */
+	flags |= GSS_C_DCE_STYLE | GSS_C_MUTUAL_FLAG;
+	ap_options |= AP_OPTS_MUTUAL_REQUIRED;
+    }
+    if (req_flags & GSS_C_IDENTIFY_FLAG)
+	flags |= GSS_C_IDENTIFY_FLAG;
+    if (req_flags & GSS_C_EXTENDED_ERROR_FLAG)
+	flags |= GSS_C_EXTENDED_ERROR_FLAG;
+
+    flags |= GSS_C_CONF_FLAG;
+    flags |= GSS_C_INTEG_FLAG;
+    flags |= GSS_C_TRANS_FLAG;
+    
+    if (ret_flags)
+	*ret_flags = flags;
+    ctx->flags = flags;
+    ctx->more_flags |= LOCAL;
+    
+    ret = _gsskrb5_create_8003_checksum (minor_status,
+					 input_chan_bindings,
+					 flags,
+					 &fwd_data,
+					 &cksum);
+    krb5_data_free (&fwd_data);
+    if (ret)
+	goto failure;
+
+    enctype = ctx->auth_context->keyblock->keytype;
+
+    kret = krb5_build_authenticator (_gsskrb5_context,
+				     ctx->auth_context,
+				     enctype,
+				     cred,
+				     &cksum,
+				     NULL,
+				     &authenticator,
+				     KRB5_KU_AP_REQ_AUTH);
+
+    if (kret) {
+	_gsskrb5_set_error_string ();
+	*minor_status = kret;
+	ret = GSS_S_FAILURE;
+	goto failure;
+    }
+
+    kret = krb5_build_ap_req (_gsskrb5_context,
+			      enctype,
+			      cred,
+			      ap_options,
+			      authenticator,
+			      &outbuf);
+
+    if (kret) {
+	_gsskrb5_set_error_string ();
+	*minor_status = kret;
+	ret = GSS_S_FAILURE;
+	goto failure;
+    }
+
+    ret = _gsskrb5_encapsulate (minor_status, &outbuf, output_token,
+				   (u_char *)"\x01\x00", GSS_KRB5_MECHANISM);
+    if (ret)
+	goto failure;
+
+    krb5_data_free (&outbuf);
+    krb5_free_creds(_gsskrb5_context, cred);
+    free_Checksum(&cksum);
+    if (initiator_cred_handle == NULL)
+	krb5_cc_close(_gsskrb5_context, ccache);
+
+    if (flags & GSS_C_MUTUAL_FLAG) {
+	ctx->state = INITIATOR_WAIT_FOR_MUTAL;
+	return GSS_S_CONTINUE_NEEDED;
+    }
+
+    return gsskrb5_initiator_ready(minor_status, ctx);
+failure:
+    if(cred)
+	krb5_free_creds(_gsskrb5_context, cred);
+    if (ccache && initiator_cred_handle == NULL)
+	krb5_cc_close(_gsskrb5_context, ccache);
+
+    return ret;
+
+}
+
+static OM_uint32
+repl_mutual
+           (OM_uint32 * minor_status,
+	    gsskrb5_ctx ctx,
+            const gss_OID mech_type,
+            OM_uint32 req_flags,
+            OM_uint32 time_req,
+            const gss_channel_bindings_t input_chan_bindings,
+            const gss_buffer_t input_token,
+            gss_OID * actual_mech_type,
+            gss_buffer_t output_token,
+            OM_uint32 * ret_flags,
+            OM_uint32 * time_rec
+           )
+{
+    OM_uint32 ret;
+    krb5_error_code kret;
+    krb5_data indata;
+    krb5_ap_rep_enc_part *repl;
+    int is_cfx = 0;
+
+    output_token->length = 0;
+    output_token->value = NULL;
+
+    if (actual_mech_type)
+	*actual_mech_type = GSS_KRB5_MECHANISM;
+
+    if (req_flags & GSS_C_DCE_STYLE) {
+	/* There is no OID wrapping. */
+	indata.length	= input_token->length;
+	indata.data	= input_token->value;
+    } else {
+	ret = _gsskrb5_decapsulate (minor_status,
+				    input_token,
+				    &indata,
+				    "\x02\x00",
+				    GSS_KRB5_MECHANISM);
+	if (ret) {
+	    /* XXX - Handle AP_ERROR */
+	    return ret;
+	}
+    }
+
+    kret = krb5_rd_rep (_gsskrb5_context,
+			ctx->auth_context,
+			&indata,
+			&repl);
+    if (kret) {
+	_gsskrb5_set_error_string ();
+	*minor_status = kret;
+	return GSS_S_FAILURE;
+    }
+    krb5_free_ap_rep_enc_part (_gsskrb5_context,
+			       repl);
+    
+    _gsskrb5i_is_cfx(ctx, &is_cfx);
+    if (is_cfx) {
+	krb5_keyblock *key = NULL;
+
+	kret = krb5_auth_con_getremotesubkey(_gsskrb5_context,
+					     ctx->auth_context, 
+					     &key);
+	if (kret == 0 && key != NULL) {
+    	    ctx->more_flags |= ACCEPTOR_SUBKEY;
+	    krb5_free_keyblock (_gsskrb5_context, key);
+	}
+    }
+
+
+    *minor_status = 0;
+    if (time_rec) {
+	ret = _gsskrb5_lifetime_left(minor_status,
+				   ctx->lifetime,
+				   time_rec);
+    } else {
+	ret = GSS_S_COMPLETE;
+    }
+    if (ret_flags)
+	*ret_flags = ctx->flags;
+
+    if (req_flags & GSS_C_DCE_STYLE) {
+	int32_t con_flags;
+	krb5_data outbuf;
+
+	/* Do don't do sequence number for the mk-rep */
+	krb5_auth_con_removeflags(_gsskrb5_context,
+				  ctx->auth_context,
+				  KRB5_AUTH_CONTEXT_DO_SEQUENCE,
+				  &con_flags);
+
+	kret = krb5_mk_rep(_gsskrb5_context,
+			   ctx->auth_context,
+			   &outbuf);
+	if (kret) {
+	    _gsskrb5_set_error_string ();
+	    *minor_status = kret;
+	    return GSS_S_FAILURE;
+	}
+	
+	output_token->length = outbuf.length;
+	output_token->value  = outbuf.data;
+
+	krb5_auth_con_removeflags(_gsskrb5_context,
+				  ctx->auth_context,
+				  KRB5_AUTH_CONTEXT_DO_SEQUENCE,
+				  NULL);
+    }
+
+    return gsskrb5_initiator_ready(minor_status, ctx);
+}
+
+/*
+ * gss_init_sec_context
+ */
+
+OM_uint32 _gsskrb5_init_sec_context
+(OM_uint32 * minor_status,
+ const gss_cred_id_t initiator_cred_handle,
+ gss_ctx_id_t * context_handle,
+ const gss_name_t target_name,
+ const gss_OID mech_type,
+ OM_uint32 req_flags,
+ OM_uint32 time_req,
+ const gss_channel_bindings_t input_chan_bindings,
+ const gss_buffer_t input_token,
+ gss_OID * actual_mech_type,
+ gss_buffer_t output_token,
+ OM_uint32 * ret_flags,
+ OM_uint32 * time_rec
+    )
+{
+    gsskrb5_cred cred = (gsskrb5_cred)initiator_cred_handle;
+    krb5_const_principal name = (krb5_const_principal)target_name;
+    gsskrb5_ctx ctx;
+    OM_uint32 ret;
+
+    GSSAPI_KRB5_INIT ();
+
+    output_token->length = 0;
+    output_token->value  = NULL;
+
+    if (context_handle == NULL) {
+	*minor_status = 0;
+	return GSS_S_FAILURE | GSS_S_CALL_BAD_STRUCTURE;
+    }
+
+    if (ret_flags)
+	*ret_flags = 0;
+    if (time_rec)
+	*time_rec = 0;
+
+    if (target_name == GSS_C_NO_NAME) {
+	if (actual_mech_type)
+	    *actual_mech_type = GSS_C_NO_OID;
+	*minor_status = 0;
+	return GSS_S_BAD_NAME;
+    }
+
+    if (mech_type != GSS_C_NO_OID && 
+	!gss_oid_equal(mech_type, GSS_KRB5_MECHANISM))
+	return GSS_S_BAD_MECH;
+
+    if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
+	OM_uint32 ret;
+
+	if (*context_handle != GSS_C_NO_CONTEXT) {
+	    *minor_status = 0;
+	    return GSS_S_FAILURE | GSS_S_CALL_BAD_STRUCTURE;
+	}
+    
+	ret = _gsskrb5_create_ctx(minor_status,
+				  context_handle,
+				  input_chan_bindings,
+				  INITIATOR_START);
+	if (ret)
+	    return ret;
+    }
+
+    if (*context_handle == GSS_C_NO_CONTEXT) {
+	*minor_status = 0;
+	return GSS_S_FAILURE | GSS_S_CALL_BAD_STRUCTURE;
+    }
+
+    ctx = (gsskrb5_ctx) *context_handle;
+
+    HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
+
+    switch (ctx->state) {
+    case INITIATOR_START:
+	ret = init_auth(minor_status,
+			cred,
+			ctx,
+			name,
+			mech_type,
+			req_flags,
+			time_req,
+			input_chan_bindings,
+			input_token,
+			actual_mech_type,
+			output_token,
+			ret_flags,
+			time_rec);
+	break;
+    case INITIATOR_WAIT_FOR_MUTAL:
+	ret = repl_mutual(minor_status,
+			  ctx,
+			  mech_type,
+			  req_flags,
+			  time_req,
+			  input_chan_bindings,
+			  input_token,
+			  actual_mech_type,
+			  output_token,
+			  ret_flags,
+			  time_rec);
+	break;
+    case INITIATOR_READY:
+	/* 
+	 * If we get there, the caller have called
+	 * gss_init_sec_context() one time too many.
+	 */
+	*minor_status = 0;
+	ret = GSS_S_BAD_STATUS;
+	break;
+    default:
+	*minor_status = 0;
+	ret = GSS_S_BAD_STATUS;
+	break;
+    }
+    HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
+
+    /* destroy context in case of error */
+    if (GSS_ERROR(ret)) {
+	OM_uint32 min2;
+	_gsskrb5_delete_sec_context(&min2, context_handle, GSS_C_NO_BUFFER);
+    }
+
+    return ret;
+
+}