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/*
* CIFS idmap helper.
* Copyright (C) Shirish Pargaonkar (shirishp@us.ibm.com) 2011
*
* Used by /sbin/request-key.conf for handling
* cifs upcall for SID to uig/gid and uid/gid to SID mapping.
* You should have keyutils installed and add
* this lines to /etc/request-key.conf file:
create cifs.idmap * * /usr/local/sbin/cifs.idmap %k
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <string.h>
#include <getopt.h>
#include <syslog.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <keyutils.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#include <wbclient.h>
static const char *prog = "cifs.idmap";
static void usage(void)
{
fprintf(stderr, "Usage: %s key_serial\n", prog);
}
char *strget(const char *str, char *substr)
{
int len, sublen, retlen;
char *retstr, *substrptr;
sublen = strlen(substr);
substrptr = strstr(str, substr);
if (substrptr) {
len = strlen(substrptr);
substrptr += sublen;
retlen = len - sublen;
if (retlen > 0) {
retstr = malloc(retlen + 1);
if (retstr) {
strncpy(retstr, substrptr, retlen);
return retstr;
}
}
}
return NULL;
}
static int
cifs_idmap(const key_serial_t key, const char *key_descr)
{
uid_t uid = 0;
gid_t gid = 0;;
wbcErr rc = 1;
char *sidstr = NULL;
struct wbcDomainSid sid;
/*
* Use winbind to convert received string to a SID and lookup
* name and map that SID to an uid. If either of these
* function calls return with an error, return an error the
* upcall caller. Otherwise instanticate a key using that uid.
*
* The same applies to SID and gid mapping.
*/
sidstr = strget(key_descr, "os:");
if (sidstr) {
rc = wbcStringToSid(sidstr, &sid);
if (rc)
syslog(LOG_DEBUG, "Invalid owner string: %s, rc: %d",
key_descr, rc);
else {
rc = wbcSidToUid(&sid, &uid);
if (rc)
syslog(LOG_DEBUG, "SID %s to uid wbc error: %d",
key_descr, rc);
}
if (!rc) { /* SID has been mapped to an uid */
rc = keyctl_instantiate(key, &uid, sizeof(uid_t), 0);
if (rc)
syslog(LOG_ERR, "%s: key inst: %s",
__func__, strerror(errno));
}
goto cifs_idmap_ret;
}
sidstr = strget(key_descr, "gs:");
if (sidstr) {
rc = wbcStringToSid(sidstr, &sid);
if (rc)
syslog(LOG_DEBUG, "Invalid group string: %s, rc: %d",
key_descr, rc);
else {
rc = wbcSidToGid(&sid, &gid);
if (rc)
syslog(LOG_DEBUG, "SID %s to gid wbc error: %d",
key_descr, rc);
}
if (!rc) { /* SID has been mapped to a gid */
rc = keyctl_instantiate(key, &gid, sizeof(gid_t), 0);
if (rc)
syslog(LOG_ERR, "%s: key inst: %s",
__func__, strerror(errno));
}
goto cifs_idmap_ret;
}
sidstr = strget(key_descr, "oi:");
if (sidstr) {
uid = atoi(sidstr);
syslog(LOG_DEBUG, "SID: %s, uid: %d", sidstr, uid);
rc = wbcUidToSid(uid, &sid);
if (rc)
syslog(LOG_DEBUG, "uid %d to SID error: %d", uid, rc);
if (!rc) { /* SID has been mapped to a uid */
rc = keyctl_instantiate(key, &sid,
sizeof(struct wbcDomainSid), 0);
if (rc)
syslog(LOG_ERR, "%s: key inst: %s",
__func__, strerror(errno));
}
goto cifs_idmap_ret;
}
sidstr = strget(key_descr, "gi:");
if (sidstr) {
gid = atoi(sidstr);
syslog(LOG_DEBUG, "SID: %s, gid: %d", sidstr, gid);
rc = wbcGidToSid(gid, &sid);
if (rc)
syslog(LOG_DEBUG, "gid %d to SID error: %d", gid, rc);
if (!rc) { /* SID has been mapped to a gid */
rc = keyctl_instantiate(key, &sid,
sizeof(struct wbcDomainSid), 0);
if (rc)
syslog(LOG_ERR, "%s: key inst: %s",
__func__, strerror(errno));
}
goto cifs_idmap_ret;
}
syslog(LOG_DEBUG, "Invalid key: %s", key_descr);
cifs_idmap_ret:
if (sidstr)
free(sidstr);
return rc;
}
int main(const int argc, char *const argv[])
{
int c;
long rc = 1;
key_serial_t key = 0;
char *buf;
openlog(prog, 0, LOG_DAEMON);
while ((c = getopt_long(argc, argv, "v", NULL, NULL)) != -1) {
switch (c) {
case 'v':
printf("version: %s\n", VERSION);
goto out;
default:
syslog(LOG_ERR, "unknown option: %c", c);
goto out;
}
}
/* is there a key? */
if (argc <= optind) {
usage();
goto out;
}
/* get key and keyring values */
errno = 0;
key = strtol(argv[optind], NULL, 10);
if (errno != 0) {
key = 0;
syslog(LOG_ERR, "Invalid key format: %s", strerror(errno));
goto out;
}
rc = keyctl_describe_alloc(key, &buf);
if (rc == -1) {
syslog(LOG_ERR, "keyctl_describe_alloc failed: %s",
strerror(errno));
rc = 1;
goto out;
}
syslog(LOG_DEBUG, "key description: %s", buf);
if ((strncmp(buf, "cifs.idmap", sizeof("cifs.idmap") - 1) == 0))
rc = cifs_idmap(key, buf);
out:
return rc;
}
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