gss: merge Apple name helper APIs

Add helper APIs to the mechanism glue from the Apple implementation.
gss_mg_export_name() can be used by a mechanism to create an exported name
(this is used by the future SAnon implementation). _gss_mech_import_name()
allows the mechanism to pass in a list of parsing functions for specific name
tiypes. This commit only adds support to the mechanism glue itself.

lib/gssapi/mech/gss_export_name.c

@@ -2,6 +2,8 @@
  * Copyright (c) 2005 Doug Rabson
  * All rights reserved.
  *
+ * Portions Copyright (c) 2010 Apple Inc. All rights reserved.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -66,3 +68,46 @@ gss_export_name(OM_uint32 *minor_status,
 	return mn->gmn_mech->gm_export_name(minor_status,
 	    mn->gmn_name, exported_name);
 }
+
+OM_uint32
+gss_mg_export_name(OM_uint32 *minor_status,
+		   const gss_const_OID mech,
+		   const void *name,
+		   size_t length, 
+		   gss_buffer_t exported_name)
+{
+    uint8_t *buf;
+
+    exported_name->length = 10 + length + mech->length;
+    exported_name->value  = malloc(exported_name->length);
+    if (exported_name->value == NULL) {
+	*minor_status = ENOMEM;
+	return GSS_S_FAILURE;
+    }
+
+    /* TOK, MECH_OID_LEN, DER(MECH_OID), NAME_LEN, NAME */
+
+    buf = exported_name->value;
+    memcpy(buf, "\x04\x01", 2);
+    buf += 2;
+    buf[0] = ((mech->length + 2) >> 8) & 0xff;
+    buf[1] = (mech->length + 2) & 0xff;
+    buf+= 2;
+    buf[0] = 0x06;
+    buf[1] = (mech->length) & 0xFF;
+    buf+= 2;
+
+    memcpy(buf, mech->elements, mech->length);
+    buf += mech->length;
+
+    buf[0] = (length >> 24) & 0xff;
+    buf[1] = (length >> 16) & 0xff;
+    buf[2] = (length >> 8) & 0xff;
+    buf[3] = (length) & 0xff;
+    buf += 4;
+
+    memcpy (buf, name, length);
+
+    *minor_status = 0;
+    return GSS_S_COMPLETE;
+}

lib/gssapi/mech/gss_get_name_attribute.c

@@ -57,6 +57,8 @@ gss_get_name_attribute(OM_uint32 *minor_status,
     if (input_name == GSS_C_NO_NAME)
         return GSS_S_BAD_NAME;
 
+    _gss_mg_check_name(input_name);
+
     HEIM_TAILQ_FOREACH(mn, &name->gn_mn, gmn_link) {
         gssapi_mech_interface m = mn->gmn_mech;
 

lib/gssapi/mech/gss_init_sec_context.c

@@ -173,6 +173,8 @@ gss_init_sec_context(OM_uint32 * minor_status,
 	if (time_rec)
 	    *time_rec = 0;
 
+	_gss_mg_check_name(target_name);
+
 	if (_gss_mg_log_level(1))
 	    log_init_sec_context(ctx, name, req_flags,
 				 (struct _gss_cred *)initiator_cred_handle,

lib/gssapi/mech/gss_names.c

@@ -30,6 +30,20 @@
 
 #include "mech_locl.h"
 
+gss_name_t
+_gss_mg_get_underlying_mech_name(gss_name_t name,
+				 gss_const_OID mech)
+{
+	struct _gss_name *n = (struct _gss_name *)name;
+	struct _gss_mechanism_name *mn;
+
+	HEIM_TAILQ_FOREACH(mn, &n->gn_mn, gmn_link) {
+		if (gss_oid_equal(mech, mn->gmn_mech_oid))
+			return mn->gmn_name;
+	}
+	return GSS_C_NO_NAME;
+}
+
 OM_uint32
 _gss_find_mn(OM_uint32 *minor_status,
 	     struct _gss_name *name,
@@ -138,3 +152,111 @@ _gss_mg_release_name(struct _gss_name *name)
 	gss_release_buffer(&junk, &name->gn_value);
 	free(name);
 }
+
+void
+_gss_mg_check_name(gss_const_name_t name)
+{
+	if (name == NULL) return;
+}
+
+/*
+ *
+ */
+
+OM_uint32
+_gss_mech_import_name(OM_uint32 * minor_status,
+		      gss_const_OID mech,
+		      struct _gss_name_type *names,
+		      const gss_buffer_t input_name_buffer,
+		      gss_const_OID input_name_type,
+		      gss_name_t *output_name)
+{
+    struct _gss_name_type *name;
+    gss_buffer_t name_buffer = input_name_buffer;
+    gss_buffer_desc export_name;
+
+    *minor_status = 0;
+
+    if (output_name == NULL)
+	return GSS_S_CALL_INACCESSIBLE_WRITE;
+
+    *output_name = GSS_C_NO_NAME;
+
+    /*
+     * If its a exported name, strip of the mech glue.
+     */
+
+    if (gss_oid_equal(input_name_type, GSS_C_NT_EXPORT_NAME)) {
+	unsigned char *p;
+	uint32_t length;
+
+	if (name_buffer->length < 10 + mech->length)
+	    return GSS_S_BAD_NAME;
+
+	/* TOK, MECH_OID_LEN, DER(MECH_OID), NAME_LEN, NAME */
+
+	p = name_buffer->value;
+
+	if (memcmp(&p[0], "\x04\x01\x00", 3) != 0 ||
+	    p[3] != mech->length + 2 ||
+	    p[4] != 0x06 ||
+	    p[5] != mech->length ||
+	    memcmp(&p[6], mech->elements, mech->length) != 0)
+	    return GSS_S_BAD_NAME;
+
+	p += 6 + mech->length;
+
+	length = p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
+	p += 4;
+
+	if (length > name_buffer->length - 10 - mech->length)
+	    return GSS_S_BAD_NAME;
+
+	/*
+	 * Point this to the mech specific name part, don't modifity
+	 * orignal input_name_buffer.
+	 */
+
+	export_name.length = length;
+	export_name.value = p;
+
+	name_buffer = &export_name;
+    }
+
+    for (name = names; name->gnt_parse != NULL; name++) {
+	if (gss_oid_equal(input_name_type, name->gnt_name_type)
+	    || (name->gnt_name_type == GSS_C_NO_OID && input_name_type == GSS_C_NO_OID))
+	    return name->gnt_parse(minor_status, mech, name_buffer,
+				   input_name_type, output_name);
+    }
+
+    return GSS_S_BAD_NAMETYPE;
+}
+
+OM_uint32
+_gss_mech_inquire_names_for_mech(OM_uint32 * minor_status,
+				 struct _gss_name_type *names,
+				 gss_OID_set *name_types)
+{
+    struct _gss_name_type *name;
+    OM_uint32 ret, junk;
+
+    ret = gss_create_empty_oid_set(minor_status, name_types);
+    if (ret != GSS_S_COMPLETE)
+	return ret;
+
+    for (name = names; name->gnt_parse != NULL; name++) {
+	if (name->gnt_name_type == GSS_C_NO_OID)
+	    continue;
+	ret = gss_add_oid_set_member(minor_status,
+				     name->gnt_name_type,
+				     name_types);
+	if (ret != GSS_S_COMPLETE)
+	    break;
+    }
+
+    if (ret != GSS_S_COMPLETE)
+	gss_release_oid_set(&junk, name_types);
+	
+    return GSS_S_COMPLETE;
+}

lib/gssapi/mech/name.h

@@ -47,3 +47,31 @@ OM_uint32
 struct _gss_name *
 	_gss_create_name(gss_name_t new_mn, gssapi_mech_interface m);
 void	_gss_mg_release_name(struct _gss_name *);
+
+
+void	_gss_mg_check_name(gss_const_name_t name);
+
+gss_name_t
+	_gss_mg_get_underlying_mech_name(gss_name_t name, gss_const_OID mech);
+
+OM_uint32
+_gss_mech_import_name(OM_uint32 * minor_status,
+		      gss_const_OID mech,
+		      struct _gss_name_type *names,
+		      const gss_buffer_t input_name_buffer,
+		      gss_const_OID input_name_type,
+		      gss_name_t *output_name);
+
+OM_uint32
+gss_mg_export_name(OM_uint32 *minor_status,
+		   const gss_const_OID mech,
+		   const void *name,
+		   size_t length, 
+		   gss_buffer_t exported_name);
+
+OM_uint32
+_gss_mech_inquire_names_for_mech(OM_uint32 * minor_status,
+				 struct _gss_name_type *names,
+				 gss_OID_set *name_types);
+
+