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/*
* 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;
}
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