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9ba10877aa
metze Autobuild-User: Stefan Metzmacher <metze@samba.org> Autobuild-Date: Wed Jun 15 19:06:24 CEST 2011 on sn-devel-104
153 lines
5.0 KiB
C
153 lines
5.0 KiB
C
/*
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Unix SMB/CIFS implementation.
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kerberos authorization data (PAC) utility library
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Copyright (C) Andrew Bartlett <abartlet@samba.org> 2011
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Copyright (C) Simo Sorce 2010.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#ifdef HAVE_KRB5
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#include "libcli/auth/krb5_wrap.h"
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#if 0
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/* FIXME - need proper configure/waf test
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* to determine if gss_mech_krb5 and friends
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* exist. JRA.
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*/
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/*
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* These are not exported by Solaris -lkrb5
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* Maybe move to libreplace somewhere?
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*/
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static const gss_OID_desc krb5_gss_oid_array[] = {
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/* this is the official, rfc-specified OID */
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{ 9, "\052\206\110\206\367\022\001\002\002" },
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/* this is the pre-RFC mech OID */
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{ 5, "\053\005\001\005\002" },
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/* this is the unofficial, incorrect mech OID emitted by MS */
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{ 9, "\052\206\110\202\367\022\001\002\002" },
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{ 0, 0 }
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};
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const gss_OID_desc * const gss_mech_krb5 = krb5_gss_oid_array+0;
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const gss_OID_desc * const gss_mech_krb5_old = krb5_gss_oid_array+1;
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const gss_OID_desc * const gss_mech_krb5_wrong = krb5_gss_oid_array+2;
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#endif
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/* The Heimdal OID for getting the PAC */
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#define EXTRACT_PAC_AUTHZ_DATA_FROM_SEC_CONTEXT_OID_LENGTH 8
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/* EXTRACTION OID AUTHZ ID */
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#define EXTRACT_PAC_AUTHZ_DATA_FROM_SEC_CONTEXT_OID "\x2a\x85\x70\x2b\x0d\x03" "\x81\x00"
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NTSTATUS gssapi_obtain_pac_blob(TALLOC_CTX *mem_ctx,
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gss_ctx_id_t gssapi_context,
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gss_name_t gss_client_name,
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DATA_BLOB *pac_blob)
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{
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NTSTATUS status;
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OM_uint32 gss_maj, gss_min;
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#ifdef HAVE_GSS_GET_NAME_ATTRIBUTE
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gss_buffer_desc pac_buffer;
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gss_buffer_desc pac_display_buffer;
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gss_buffer_desc pac_name = {
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.value = discard_const("urn:mspac:"),
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.length = sizeof("urn:mspac:")-1
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};
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int more = -1;
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int authenticated = false;
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int complete = false;
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gss_maj = gss_get_name_attribute(
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&gss_min, gss_client_name, &pac_name,
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&authenticated, &complete,
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&pac_buffer, &pac_display_buffer, &more);
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if (gss_maj != 0) {
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DEBUG(0, ("obtaining PAC via GSSAPI gss_get_name_attribute failed: %s\n",
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gssapi_error_string(mem_ctx, gss_maj, gss_min, gss_mech_krb5)));
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return NT_STATUS_ACCESS_DENIED;
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} else if (authenticated && complete) {
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/* The PAC blob is returned directly */
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*pac_blob = data_blob_talloc(mem_ctx, pac_buffer.value,
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pac_buffer.length);
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if (!pac_blob->data) {
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status = NT_STATUS_NO_MEMORY;
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} else {
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status = NT_STATUS_OK;
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}
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gss_maj = gss_release_buffer(&gss_min, &pac_buffer);
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gss_maj = gss_release_buffer(&gss_min, &pac_display_buffer);
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return status;
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} else {
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DEBUG(0, ("obtaining PAC via GSSAPI failed: authenticated: %s, complete: %s, more: %s\n",
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authenticated ? "true" : "false",
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complete ? "true" : "false",
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more ? "true" : "false"));
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return NT_STATUS_ACCESS_DENIED;
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}
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#elif defined(HAVE_GSS_INQUIRE_SEC_CONTEXT_BY_OID)
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gss_OID_desc pac_data_oid = {
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.elements = discard_const(EXTRACT_PAC_AUTHZ_DATA_FROM_SEC_CONTEXT_OID),
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.length = EXTRACT_PAC_AUTHZ_DATA_FROM_SEC_CONTEXT_OID_LENGTH
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};
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gss_buffer_set_t set = GSS_C_NO_BUFFER_SET;
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/* If we didn't have the routine to get a verified, validated
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* PAC (supplied only by MIT at the time of writing), then try
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* with the Heimdal OID (fetches the PAC directly and always
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* validates) */
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gss_maj = gss_inquire_sec_context_by_oid(
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&gss_min, gssapi_context,
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&pac_data_oid, &set);
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/* First check for the error MIT gives for an unknown OID */
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if (gss_maj == GSS_S_UNAVAILABLE) {
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DEBUG(1, ("unable to obtain a PAC against this GSSAPI library. "
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"GSSAPI secured connections are available only with Heimdal or MIT Kerberos >= 1.8\n"));
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} else if (gss_maj != 0) {
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DEBUG(2, ("obtaining PAC via GSSAPI gss_inqiure_sec_context_by_oid (Heimdal OID) failed: %s\n",
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gssapi_error_string(mem_ctx, gss_maj, gss_min, gss_mech_krb5)));
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} else {
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if (set == GSS_C_NO_BUFFER_SET) {
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DEBUG(0, ("gss_inquire_sec_context_by_oid returned unknown "
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"data in results.\n"));
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return NT_STATUS_INTERNAL_ERROR;
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}
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/* The PAC blob is returned directly */
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*pac_blob = data_blob_talloc(mem_ctx, set->elements[0].value,
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set->elements[0].length);
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if (!pac_blob->data) {
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status = NT_STATUS_NO_MEMORY;
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} else {
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status = NT_STATUS_OK;
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}
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gss_maj = gss_release_buffer_set(&gss_min, &set);
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return status;
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}
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#else
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DEBUG(1, ("unable to obtain a PAC against this GSSAPI library. "
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"GSSAPI secured connections are available only with Heimdal or MIT Kerberos >= 1.8\n"));
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#endif
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return NT_STATUS_ACCESS_DENIED;
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}
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#endif
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