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-rw-r--r--auth/kerberos/gssapi_pac.c123
-rw-r--r--auth/kerberos/wscript_build3
2 files changed, 126 insertions, 0 deletions
diff --git a/auth/kerberos/gssapi_pac.c b/auth/kerberos/gssapi_pac.c
new file mode 100644
index 0000000000..dd2fb7e0a7
--- /dev/null
+++ b/auth/kerberos/gssapi_pac.c
@@ -0,0 +1,123 @@
+/*
+ Unix SMB/CIFS implementation.
+ kerberos authorization data (PAC) utility library
+ Copyright (C) Andrew Bartlett <abartlet@samba.org> 2011
+ Copyright (C) Simo Sorce 2010.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#ifdef HAVE_KRB5
+
+#include "libcli/auth/krb5_wrap.h"
+
+/* The Heimdal OID for getting the PAC */
+#define EXTRACT_PAC_AUTHZ_DATA_FROM_SEC_CONTEXT_OID_LENGTH 8
+/* EXTRACTION OID AUTHZ ID */
+#define EXTRACT_PAC_AUTHZ_DATA_FROM_SEC_CONTEXT_OID "\x2a\x85\x70\x2b\x0d\x03" "\x81\x00"
+
+static gss_OID_desc pac_data_oid = {
+ EXTRACT_PAC_AUTHZ_DATA_FROM_SEC_CONTEXT_OID_LENGTH,
+ (void *)EXTRACT_PAC_AUTHZ_DATA_FROM_SEC_CONTEXT_OID
+};
+
+NTSTATUS gssapi_obtain_pac_blob(TALLOC_CTX *mem_ctx,
+ gss_ctx_id_t gssapi_context,
+ gss_name_t gss_client_name,
+ DATA_BLOB *pac_blob)
+{
+ OM_uint32 gss_maj, gss_min;
+ gss_buffer_set_t set = GSS_C_NO_BUFFER_SET;
+ gss_buffer_desc pac_buffer;
+ gss_buffer_desc pac_display_buffer;
+ gss_buffer_desc pac_name = {
+ .value = "urn:mspac:",
+ .length = sizeof("urn:mspac:")-1
+ };
+ NTSTATUS status;
+ int more = -1;
+ int authenticated = false;
+ int complete = false;
+
+#ifdef HAVE_GSS_GET_NAME_ATTRIBUTE
+ gss_maj = gss_get_name_attribute(
+ &gss_min, gss_client_name, &pac_name,
+ &authenticated, &complete,
+ &pac_buffer, &pac_display_buffer, &more);
+
+ if (gss_maj != 0) {
+ DEBUG(0, ("obtaining PAC via GSSAPI gss_get_name_attribute failed: %s\n",
+ gssapi_error_string(mem_ctx, gss_maj, gss_min, gss_mech_krb5)));
+ return NT_STATUS_ACCESS_DENIED;
+ } else if (authenticated && complete) {
+ /* The PAC blob is returned directly */
+ *pac_blob = data_blob_talloc(mem_ctx, pac_buffer.value,
+ pac_buffer.length);
+
+ if (!pac_blob->data) {
+ status = NT_STATUS_NO_MEMORY;
+ } else {
+ status = NT_STATUS_OK;
+ }
+
+ gss_maj = gss_release_buffer(&gss_min, &pac_buffer);
+ gss_maj = gss_release_buffer(&gss_min, &pac_display_buffer);
+ return status;
+ } else {
+ DEBUG(0, ("obtaining PAC via GSSAPI failed: authenticated: %s, complete: %s, more: %s\n",
+ authenticated ? "true" : "false",
+ complete ? "true" : "false",
+ more ? "true" : "false"));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+#endif
+ /* If we didn't have the routine to get a verified, validated
+ * PAC (supplied only by MIT at the time of writing), then try
+ * with the Heimdal OID (fetches the PAC directly and always
+ * validates) */
+ gss_maj = gss_inquire_sec_context_by_oid(
+ &gss_min, gssapi_context,
+ &pac_data_oid, &set);
+
+ /* First check for the error MIT gives for an unknown OID */
+ if (gss_maj == GSS_S_UNAVAILABLE) {
+ DEBUG(1, ("unable to obtain a PAC against this GSSAPI library. "
+ "GSSAPI secured connections are available only with Heimdal or MIT Kerberos >= 1.8\n"));
+ } else if (gss_maj != 0) {
+ DEBUG(2, ("obtaining PAC via GSSAPI gss_inqiure_sec_context_by_oid (Heimdal OID) failed: %s\n",
+ gssapi_error_string(mem_ctx, gss_maj, gss_min, gss_mech_krb5)));
+ } else {
+ if (set == GSS_C_NO_BUFFER_SET) {
+ DEBUG(0, ("gss_inquire_sec_context_by_oid returned unknown "
+ "data in results.\n"));
+ return NT_STATUS_INTERNAL_ERROR;
+ }
+
+ /* The PAC blob is returned directly */
+ *pac_blob = data_blob_talloc(mem_ctx, set->elements[0].value,
+ set->elements[0].length);
+ if (!pac_blob->data) {
+ status = NT_STATUS_NO_MEMORY;
+ } else {
+ status = NT_STATUS_OK;
+ }
+
+ gss_maj = gss_release_buffer_set(&gss_min, &set);
+ return status;
+ }
+ return NT_STATUS_ACCESS_DENIED;
+}
+#endif
diff --git a/auth/kerberos/wscript_build b/auth/kerberos/wscript_build
new file mode 100644
index 0000000000..c289aab839
--- /dev/null
+++ b/auth/kerberos/wscript_build
@@ -0,0 +1,3 @@
+bld.SAMBA_SUBSYSTEM('KRB5_PAC',
+ source='gssapi_pac.c',
+ deps='gssapi_krb5 krb5 ndr-krb5pac')