1 files changed, 115 insertions, 0 deletions
diff --git a/idmapwb.c b/idmapwb.c
new file mode 100644
index 0000000..858028f
--- /dev/null
+++ b/idmapwb.c
@@ -0,0 +1,115 @@
+/*
+ * Winbind ID Mapping Plugin
+ * Copyright (C) 2012 Jeff Layton (jlayton@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/>.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#include <stdint.h>
+#include <endian.h>
+#include <string.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <wbclient.h>
+
+#include "cifsidmap.h"
+
+static const char **plugin_errmsg;
+
+/*
+ * Winbind keeps wbcDomainSid fields in host-endian. Copy fields from the
+ * csid to the wsid, while converting the subauthority fields from LE.
+ */
+static void
+csid_to_wsid(struct wbcDomainSid *wsid, const struct cifs_sid *csid)
+{
+	int i;
+	uint8_t num_subauth = (csid->num_subauth <= WBC_MAXSUBAUTHS) ?
+				csid->num_subauth : WBC_MAXSUBAUTHS;
+
+	wsid->sid_rev_num = csid->revision;
+	wsid->num_auths = num_subauth;
+	for (i = 0; i < NUM_AUTHS; i++)
+		wsid->id_auth[i] = csid->authority[i];
+	for (i = 0; i < num_subauth; i++)
+		wsid->sub_auths[i] = le32toh(csid->sub_auth[i]);
+}
+
+int
+cifs_idmap_sid_to_str(void *handle __attribute__ ((unused)),
+			const struct cifs_sid *csid, char **string)
+{
+	int rc;
+	wbcErr wbcrc;
+	char *domain = NULL;
+	char *name = NULL;
+	enum wbcSidType sntype;
+	struct wbcDomainSid wsid;
+	size_t len;
+
+	csid_to_wsid(&wsid, csid);
+
+	wbcrc = wbcLookupSid(&wsid, &domain, &name, &sntype);
+	if (!WBC_ERROR_IS_OK(wbcrc)) {
+		*plugin_errmsg = wbcErrorString(wbcrc);
+		return -EIO;
+	}
+
+	/* +1 for '\\' and +1 for NULL terminator */
+	len = strlen(domain) + 1 + strlen(name) + 1;
+
+	*string = malloc(len);
+	if (!*string) {
+		*plugin_errmsg = "Unable to allocate memory";
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	rc = snprintf(*string, len, "%s\\%s", domain, name);
+	if (rc >= (long)len) {
+		free(*string);
+		*plugin_errmsg = "Resulting string was truncated";
+		*string = NULL;
+		rc = -EIO;
+	} else {
+		rc = 0;
+	}
+out:
+	wbcFreeMemory(domain);
+	wbcFreeMemory(name);
+	return rc;
+}
+
+/*
+ * For the winbind plugin, we don't need to do anything special on
+ * init or exit
+ */
+int
+cifs_idmap_init_plugin(void **handle __attribute__((unused)), const char **errmsg)
+{
+	plugin_errmsg = errmsg;
+	return 0;
+}
+
+void
+cifs_idmap_exit_plugin(void *handle __attribute__((unused)))
+{
+	return;
+}