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, 379 insertions, 0 deletions

diff --git a/source4/heimdal/lib/gssapi/krb5/acquire_cred.c b/source4/heimdal/lib/gssapi/krb5/acquire_cred.c
new file mode 100644
index 0000000000..df6e137402
--- /dev/null
+++ b/source4/heimdal/lib/gssapi/krb5/acquire_cred.c
@@ -0,0 +1,379 @@
+/*
+ * 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: acquire_cred.c,v 1.31 2006/10/07 22:13:55 lha Exp $");
+
+OM_uint32
+__gsskrb5_ccache_lifetime(OM_uint32 *minor_status,
+			     krb5_ccache id,
+			     krb5_principal principal,
+			     OM_uint32 *lifetime)
+{
+    krb5_creds in_cred, *out_cred;
+    krb5_const_realm realm;
+    krb5_error_code kret;
+
+    memset(&in_cred, 0, sizeof(in_cred));
+    in_cred.client = principal;
+	
+    realm = krb5_principal_get_realm(_gsskrb5_context,  principal);
+    if (realm == NULL) {
+	_gsskrb5_clear_status ();
+	*minor_status = KRB5_PRINC_NOMATCH; /* XXX */
+	return GSS_S_FAILURE;
+    }
+
+    kret = krb5_make_principal(_gsskrb5_context, &in_cred.server, 
+			       realm, KRB5_TGS_NAME, realm, NULL);
+    if (kret) {
+	_gsskrb5_set_error_string();
+	*minor_status = kret;
+	return GSS_S_FAILURE;
+    }
+
+    kret = krb5_get_credentials(_gsskrb5_context, 0, 
+				id, &in_cred, &out_cred);
+    krb5_free_principal(_gsskrb5_context, in_cred.server);
+    if (kret) {
+	_gsskrb5_set_error_string();
+	*minor_status = kret;
+	return GSS_S_FAILURE;
+    }
+
+    *lifetime = out_cred->times.endtime;
+    krb5_free_creds(_gsskrb5_context, out_cred);
+
+    return GSS_S_COMPLETE;
+}
+
+
+
+
+static krb5_error_code
+get_keytab(krb5_keytab *keytab)
+{
+    char kt_name[256];
+    krb5_error_code kret;
+
+    HEIMDAL_MUTEX_lock(&gssapi_keytab_mutex);
+
+    if (_gsskrb5_keytab != NULL) {
+	kret = krb5_kt_get_name(_gsskrb5_context,
+				_gsskrb5_keytab,
+				kt_name, sizeof(kt_name));
+	if (kret == 0)
+	    kret = krb5_kt_resolve(_gsskrb5_context, kt_name, keytab);
+    } else
+	kret = krb5_kt_default(_gsskrb5_context, keytab);
+
+    HEIMDAL_MUTEX_unlock(&gssapi_keytab_mutex);
+
+    return (kret);
+}
+
+static OM_uint32 acquire_initiator_cred
+		  (OM_uint32 * minor_status,
+		   const gss_name_t desired_name,
+		   OM_uint32 time_req,
+		   const gss_OID_set desired_mechs,
+		   gss_cred_usage_t cred_usage,
+		   gsskrb5_cred handle,
+		   gss_OID_set * actual_mechs,
+		   OM_uint32 * time_rec
+		  )
+{
+    OM_uint32 ret;
+    krb5_creds cred;
+    krb5_principal def_princ;
+    krb5_get_init_creds_opt *opt;
+    krb5_ccache ccache;
+    krb5_keytab keytab;
+    krb5_error_code kret;
+
+    keytab = NULL;
+    ccache = NULL;
+    def_princ = NULL;
+    ret = GSS_S_FAILURE;
+    memset(&cred, 0, sizeof(cred));
+
+    /* If we have a preferred principal, lets try to find it in all
+     * caches, otherwise, fall back to default cache.  Ignore
+     * errors. */
+    if (handle->principal)
+	kret = krb5_cc_cache_match (_gsskrb5_context,
+				    handle->principal,
+				    NULL,
+				    &ccache);
+    
+    if (ccache == NULL) {
+	kret = krb5_cc_default(_gsskrb5_context, &ccache);
+	if (kret)
+	    goto end;
+    }
+    kret = krb5_cc_get_principal(_gsskrb5_context, ccache,
+	&def_princ);
+    if (kret != 0) {
+	/* we'll try to use a keytab below */
+	krb5_cc_destroy(_gsskrb5_context, ccache);
+	ccache = NULL;
+	kret = 0;
+    } else if (handle->principal == NULL)  {
+	kret = krb5_copy_principal(_gsskrb5_context, def_princ,
+	    &handle->principal);
+	if (kret)
+	    goto end;
+    } else if (handle->principal != NULL &&
+	krb5_principal_compare(_gsskrb5_context, handle->principal,
+	def_princ) == FALSE) {
+	/* Before failing, lets check the keytab */
+	krb5_free_principal(_gsskrb5_context, def_princ);
+	def_princ = NULL;
+    }
+    if (def_princ == NULL) {
+	/* We have no existing credentials cache,
+	 * so attempt to get a TGT using a keytab.
+	 */
+	if (handle->principal == NULL) {
+	    kret = krb5_get_default_principal(_gsskrb5_context,
+		&handle->principal);
+	    if (kret)
+		goto end;
+	}
+	kret = get_keytab(&keytab);
+	if (kret)
+	    goto end;
+	kret = krb5_get_init_creds_opt_alloc(_gsskrb5_context, &opt);
+	if (kret)
+	    goto end;
+	kret = krb5_get_init_creds_keytab(_gsskrb5_context, &cred,
+	    handle->principal, keytab, 0, NULL, opt);
+	krb5_get_init_creds_opt_free(opt);
+	if (kret)
+	    goto end;
+	kret = krb5_cc_gen_new(_gsskrb5_context, &krb5_mcc_ops,
+		&ccache);
+	if (kret)
+	    goto end;
+	kret = krb5_cc_initialize(_gsskrb5_context, ccache, cred.client);
+	if (kret)
+	    goto end;
+	kret = krb5_cc_store_cred(_gsskrb5_context, ccache, &cred);
+	if (kret)
+	    goto end;
+	handle->lifetime = cred.times.endtime;
+	handle->cred_flags |= GSS_CF_DESTROY_CRED_ON_RELEASE;
+    } else {
+
+	ret = __gsskrb5_ccache_lifetime(minor_status,
+					   ccache,
+					   handle->principal,
+					   &handle->lifetime);
+	if (ret != GSS_S_COMPLETE)
+	    goto end;
+	kret = 0;
+    }
+
+    handle->ccache = ccache;
+    ret = GSS_S_COMPLETE;
+
+end:
+    if (cred.client != NULL)
+	krb5_free_cred_contents(_gsskrb5_context, &cred);
+    if (def_princ != NULL)
+	krb5_free_principal(_gsskrb5_context, def_princ);
+    if (keytab != NULL)
+	krb5_kt_close(_gsskrb5_context, keytab);
+    if (ret != GSS_S_COMPLETE) {
+	if (ccache != NULL)
+	    krb5_cc_close(_gsskrb5_context, ccache);
+	if (kret != 0) {
+	    *minor_status = kret;
+	    _gsskrb5_set_error_string ();
+	}
+    }
+    return (ret);
+}
+
+static OM_uint32 acquire_acceptor_cred
+		  (OM_uint32 * minor_status,
+		   const gss_name_t desired_name,
+		   OM_uint32 time_req,
+		   const gss_OID_set desired_mechs,
+		   gss_cred_usage_t cred_usage,
+		   gsskrb5_cred handle,
+		   gss_OID_set * actual_mechs,
+		   OM_uint32 * time_rec
+		  )
+{
+    OM_uint32 ret;
+    krb5_error_code kret;
+
+    kret = 0;
+    ret = GSS_S_FAILURE;
+    kret = get_keytab(&handle->keytab);
+    if (kret)
+	goto end;
+    
+    /* check that the requested principal exists in the keytab */
+    if (handle->principal) {
+	krb5_keytab_entry entry;
+
+	kret = krb5_kt_get_entry(_gsskrb5_context, handle->keytab, 
+				 handle->principal, 0, 0, &entry);
+	if (kret)
+	    goto end;
+	krb5_kt_free_entry(_gsskrb5_context, &entry);
+    }
+    ret = GSS_S_COMPLETE;
+ 
+end:
+    if (ret != GSS_S_COMPLETE) {
+	if (handle->keytab != NULL)
+	    krb5_kt_close(_gsskrb5_context, handle->keytab);
+	if (kret != 0) {
+	    *minor_status = kret;
+	    _gsskrb5_set_error_string ();
+	}
+    }
+    return (ret);
+}
+
+OM_uint32 _gsskrb5_acquire_cred
+(OM_uint32 * minor_status,
+ const gss_name_t desired_name,
+ OM_uint32 time_req,
+ const gss_OID_set desired_mechs,
+ gss_cred_usage_t cred_usage,
+ gss_cred_id_t * output_cred_handle,
+ gss_OID_set * actual_mechs,
+ OM_uint32 * time_rec
+    )
+{
+    gsskrb5_cred handle;
+    OM_uint32 ret;
+
+    if (cred_usage != GSS_C_ACCEPT && cred_usage != GSS_C_INITIATE && cred_usage != GSS_C_BOTH) {
+	*minor_status = GSS_KRB5_S_G_BAD_USAGE;
+	return GSS_S_FAILURE;
+    }
+
+    GSSAPI_KRB5_INIT ();
+
+    *output_cred_handle = NULL;
+    if (time_rec)
+	*time_rec = 0;
+    if (actual_mechs)
+	*actual_mechs = GSS_C_NO_OID_SET;
+
+    if (desired_mechs) {
+	int present = 0;
+
+	ret = _gsskrb5_test_oid_set_member(minor_status, GSS_KRB5_MECHANISM,
+					   desired_mechs, &present); 
+	if (ret)
+	    return ret;
+	if (!present) {
+	    *minor_status = 0;
+	    return GSS_S_BAD_MECH;
+	}
+    }
+
+    handle = calloc(1, sizeof(*handle));
+    if (handle == NULL) {
+	*minor_status = ENOMEM;
+        return (GSS_S_FAILURE);
+    }
+
+    HEIMDAL_MUTEX_init(&handle->cred_id_mutex);
+
+    if (desired_name != GSS_C_NO_NAME) {
+	krb5_principal name = (krb5_principal)desired_name;
+	ret = krb5_copy_principal(_gsskrb5_context, name, &handle->principal);
+	if (ret) {
+	    HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
+	    _gsskrb5_set_error_string();
+	    *minor_status = ret;
+	    free(handle);
+	    return GSS_S_FAILURE;
+	}
+    }
+    if (cred_usage == GSS_C_INITIATE || cred_usage == GSS_C_BOTH) {
+	ret = acquire_initiator_cred(minor_status, desired_name, time_req,
+				     desired_mechs, cred_usage, handle, actual_mechs, time_rec);
+    	if (ret != GSS_S_COMPLETE) {
+	    HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
+	    krb5_free_principal(_gsskrb5_context, handle->principal);
+	    free(handle);
+	    return (ret);
+	}
+    }
+    if (cred_usage == GSS_C_ACCEPT || cred_usage == GSS_C_BOTH) {
+	ret = acquire_acceptor_cred(minor_status, desired_name, time_req,
+				    desired_mechs, cred_usage, handle, actual_mechs, time_rec);
+	if (ret != GSS_S_COMPLETE) {
+	    HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
+	    krb5_free_principal(_gsskrb5_context, handle->principal);
+	    free(handle);
+	    return (ret);
+	}
+    }
+    ret = _gsskrb5_create_empty_oid_set(minor_status, &handle->mechanisms);
+    if (ret == GSS_S_COMPLETE)
+    	ret = _gsskrb5_add_oid_set_member(minor_status, GSS_KRB5_MECHANISM,
+					  &handle->mechanisms);
+    if (ret == GSS_S_COMPLETE)
+    	ret = _gsskrb5_inquire_cred(minor_status, (gss_cred_id_t)handle, 
+				    NULL, time_rec, NULL, actual_mechs);
+    if (ret != GSS_S_COMPLETE) {
+	if (handle->mechanisms != NULL)
+	    _gsskrb5_release_oid_set(NULL, &handle->mechanisms);
+	HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
+	krb5_free_principal(_gsskrb5_context, handle->principal);
+	free(handle);
+	return (ret);
+    } 
+    *minor_status = 0;
+    if (time_rec) {
+	ret = _gsskrb5_lifetime_left(minor_status,
+				   handle->lifetime,
+				   time_rec);
+
+	if (ret)
+	    return ret;
+    }
+    handle->usage = cred_usage;
+    *output_cred_handle = (gss_cred_id_t)handle;
+    return (GSS_S_COMPLETE);
+}