idmap_hash: Add the idmap/nss-info provider from Likewise Open.

* Port the Likewise Open idmap/nss_info provider (renamed to
  idmap_hash).

* uids & gids are generated based on a hashing algorithm that collapse
  the Domain SID to a 31 bit number.  The reverse mapping from the
  high order 11 bits to the originat8ing sdomain SID is stored in
  a has table initialized at start up.

* Includes support for "idmap_hash:name_map = <filename>" for the
  name aliasing layer.  The name map file consist of entries in
  the form "alias = DOMAIN\name"

1 files changed, 175 insertions, 0 deletions

diff --git a/source3/winbindd/idmap_hash/mapfile.c b/source3/winbindd/idmap_hash/mapfile.c
new file mode 100644
index 0000000000..5ab1142ffe
--- /dev/null
+++ b/source3/winbindd/idmap_hash/mapfile.c
@@ -0,0 +1,175 @@
+/*
+ *  mapfile.c
+ *
+ *  Copyright (C) Gerald Carter  <jerry@samba.org>
+ *
+ *  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"
+#include "winbindd/winbindd.h"
+#include "idmap_hash.h"
+#include <stdio.h>
+
+XFILE *lw_map_file = NULL;
+
+/*********************************************************************
+ ********************************************************************/
+
+static bool mapfile_open(void)
+{
+	const char *mapfile_name = NULL;
+
+	/* If we have an open handle, just reset it */
+
+	if (lw_map_file) {
+		return (x_tseek(lw_map_file, 0, SEEK_SET) == 0);
+	}
+
+	mapfile_name = lp_parm_const_string(-1, "idmap_hash", "name_map", NULL);
+	if (!mapfile_name) {
+		return false;
+	}
+
+	lw_map_file = x_fopen(mapfile_name, O_RDONLY, 0);
+	if (!lw_map_file) {
+		DEBUG(0,("can't open idmap_hash:name_map (%s). Error %s\n",
+			 mapfile_name, strerror(errno) ));
+		return false;
+	}
+
+	return true;
+}
+
+/*********************************************************************
+ ********************************************************************/
+
+static bool mapfile_read_line(fstring key, fstring value)
+{
+	char buffer[1024];
+	char *p;
+	int len;
+
+	if (!lw_map_file)
+		return false;
+
+	if ((p = x_fgets(buffer, sizeof(buffer)-1, lw_map_file)) == NULL) {
+		return false;
+	}
+
+	/* Strip newlines and carriage returns */
+
+	len = strlen_m(buffer) - 1;
+	while ((buffer[len] == '\n') || (buffer[len] == '\r')) {
+		buffer[len--] = '\0';
+	}
+
+
+	if ((p = strchr_m(buffer, '=')) == NULL ) {
+		DEBUG(0,("idmap_hash: Bad line in name_map (%s)\n", buffer));
+		return false;
+	}
+
+	*p = '\0';
+	p++;
+
+	fstrcpy(key, buffer);
+	fstrcpy(value, p);
+
+	/* Eat whitespace */
+
+	if (!trim_char(key, ' ', ' '))
+		return false;
+
+	if (!trim_char(value, ' ', ' '))
+		return false;
+
+	return true;
+}
+
+/*********************************************************************
+ ********************************************************************/
+
+static bool mapfile_close(void)
+{
+	int ret = 0;
+	if (lw_map_file) {
+		ret = x_fclose(lw_map_file);
+		lw_map_file = NULL;
+	}
+
+	return (ret == 0);
+}
+
+
+/*********************************************************************
+ ********************************************************************/
+
+NTSTATUS mapfile_lookup_key(TALLOC_CTX *ctx, const char *value, char **key)
+{
+	fstring r_key, r_value;
+	NTSTATUS ret = NT_STATUS_NOT_FOUND;
+
+	if (!mapfile_open())
+		return NT_STATUS_OBJECT_PATH_NOT_FOUND;
+
+	while (mapfile_read_line(r_key, r_value))
+	{
+		if (strequal(r_value, value)) {
+			ret = NT_STATUS_OK;
+
+			/* We're done once finishing this block */
+			*key = talloc_strdup(ctx, r_key);
+			if (!*key) {
+				ret = NT_STATUS_NO_MEMORY;
+			}
+			break;
+		}
+	}
+
+	mapfile_close();
+
+	return ret;
+}
+
+/*********************************************************************
+ ********************************************************************/
+
+NTSTATUS mapfile_lookup_value(TALLOC_CTX *ctx, const char *key, char **value)
+{
+	fstring r_key, r_value;
+	NTSTATUS ret = NT_STATUS_NOT_FOUND;
+
+	if (!mapfile_open())
+		return NT_STATUS_OBJECT_PATH_NOT_FOUND;
+
+	while (mapfile_read_line(r_key, r_value))
+	{
+		if (strequal(r_key, key)) {
+			ret = NT_STATUS_OK;
+
+			/* We're done once finishing this block */
+			*value = talloc_strdup(ctx, r_value);
+			if (!*key) {
+				ret = NT_STATUS_NO_MEMORY;
+			}
+			break;
+		}
+	}
+
+	mapfile_close();
+
+	return ret;
+}