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be-ldap.c
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be-ldap.c
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/*
* Copyright (c) 2014 Jan-Piet Mens <[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of mosquitto nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef BE_LDAP
#define LDAP_DEPRECATED 1
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <mosquitto.h>
#include "backends.h"
#include "be-ldap.h"
#include "log.h"
#include "hash.h"
struct ldap_backend {
char *ldap_uri;
char *connstr; /* ldap_initialize() wants scheme://host:port only */
LDAPURLDesc *lud;
LDAP *ld;
char *user_uri;
char *superquery;
char *aclquery;
int acldeny;
};
static char *get_bool(char *option, char *defval)
{
char *flag = p_stab(option);
flag = flag ? flag : defval;
if (!strcmp("true", flag) || !strcmp("false", flag)) {
return flag;
}
_log(LOG_NOTICE, "WARN: %s is unexpected value -> %s", option, flag);
return defval;
}
void *be_ldap_init()
{
struct ldap_backend *conf;
char *uri;
char *binddn, *bindpw;
char *opt_flag;
int rc, opt, len;
_log(LOG_DEBUG, "}}}} LDAP");
uri = p_stab("ldap_uri");
binddn = p_stab("binddn");
bindpw = p_stab("bindpw");
if (!uri) {
_fatal("Mandatory option 'ldap_uri' is missing");
return (NULL);
}
if (!ldap_is_ldap_url(uri)) {
_fatal("Mandatory option 'ldap_uri' doesn't look like an LDAP URI");
return (NULL);
}
if ((conf = (struct ldap_backend *)malloc(sizeof(struct ldap_backend))) == NULL)
return (NULL);
conf->ldap_uri = NULL;
conf->connstr = NULL;
conf->lud = NULL;
conf->ld = NULL;
conf->user_uri = NULL;
conf->superquery = NULL;
conf->aclquery = NULL;
conf->acldeny = 0;
conf->ldap_uri = strdup(uri);
if (ldap_url_parse(uri, &conf->lud) != 0) {
_fatal("Cannot parse ldap_uri");
return (NULL);
}
/* ldap_initialize() allows schema://host:port only; build
* an appropriate string from what we have, to use later also.
*/
len = strlen(conf->lud->lud_scheme) + strlen(conf->lud->lud_host) + 15;
if ((conf->connstr = malloc(len)) == NULL) {
_fatal("Out of memory");
return (NULL);
}
sprintf(conf->connstr, "%s://%s:%d", conf->lud->lud_scheme, conf->lud->lud_host, conf->lud->lud_port);
if (ldap_initialize(&conf->ld, conf->connstr) != LDAP_SUCCESS) {
ldap_free_urldesc(conf->lud);
free(conf->connstr);
free(conf->ldap_uri);
_fatal("Cannot ldap_initialize");
return (NULL);
}
opt = LDAP_VERSION3;
ldap_set_option(conf->ld, LDAP_OPT_PROTOCOL_VERSION, &opt);
if ((rc = ldap_simple_bind_s(conf->ld, binddn, bindpw)) != LDAP_SUCCESS) {
_fatal("Cannot bind to LDAP: %s", ldap_err2string(rc));
return (NULL);
}
// conf->superquery = p_stab("superquery");
// conf->aclquery = p_stab("aclquery");
opt_flag = get_bool("ldap_acl_deny", "false");
if (!strcmp("true", opt_flag))
conf->acldeny = 1;
return ((void *)conf);
}
void be_ldap_destroy(void *handle)
{
struct ldap_backend *conf = (struct ldap_backend *)handle;
if (conf) {
ldap_free_urldesc(conf->lud);
free(conf->ldap_uri);
if (conf->connstr)
free(conf->connstr);
if (conf->ld)
ldap_unbind(conf->ld);
free(conf);
}
}
/*
* Open a new connection to LDAP so that we don't lose the exising
* binddn/pw. Check if the user's `dn' can bind with `password'.
* Return T/F. `connstr' is a scheme://host:port thing.
*/
static int user_bind(char *connstr, char *dn, const char *password)
{
LDAP *ld;
int opt, rc;
if (ldap_initialize(&ld, connstr) != LDAP_SUCCESS) {
_log(1, "Cannot ldap_initialize-2");
return (FALSE);
}
opt = LDAP_VERSION3;
ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION, &opt);
if ((rc = ldap_simple_bind_s(ld, dn, password)) != LDAP_SUCCESS) {
_log(1, "Cannot bind to LDAP as %s: %s", dn, ldap_err2string(rc));
return (FALSE);
}
ldap_unbind(ld);
return (TRUE);
}
int be_ldap_getuser(void *handle, const char *username, const char *password, char **phash, const char *clientid)
{
struct ldap_backend *conf = (struct ldap_backend *)handle;
LDAPMessage *msg,*entry;
int rc, len;
char *filter, *bp, *fp, *up, *dn;
// printf("+++++++++++ GET %s USERNAME [%s] (%s)\n", conf->ldap_uri, username, password);
/*
* Replace '@' in filter with `username'
*/
len = strlen(conf->lud->lud_filter) + strlen(username) + 10;
filter = (char *)malloc(len);
for (fp = filter, bp = conf->lud->lud_filter; bp && *bp;) {
if (*bp == '@') {
++bp;
for (up = (char *)username; up && *up; up++) {
*fp++ = *up;
}
} else {
*fp++ = *bp++;
}
*fp = 0;
}
rc = ldap_search_s(conf->ld,
conf->lud->lud_dn,
conf->lud->lud_scope,
filter,
conf->lud->lud_attrs,
0,
&msg);
if (rc != LDAP_SUCCESS) {
_fatal("Cannot search LDAP for user %s: %s", username, ldap_err2string(rc));
return BACKEND_ERROR;
}
free(filter);
if (ldap_count_entries(conf->ld, msg) != 1) {
_log(1, "LDAP search for %s returns != 1 entry", username);
return BACKEND_DEFER;
}
rc = BACKEND_DEFER;
if ((entry = ldap_first_entry(conf->ld, msg)) != NULL) {
dn = ldap_get_dn(conf->ld, entry);
_log(1, "Attempt to bind as %s\n", dn);
if (user_bind(conf->connstr, dn, password)) {
rc = BACKEND_ALLOW;
}
ldap_memfree(dn);
}
return rc;
}
/*
* Return T/F if user is superuser
*/
int be_ldap_superuser(void *handle, const char *username)
{
struct ldap_backend *conf = (struct ldap_backend *)handle;
printf("%s\n", conf->ldap_uri);
return BACKEND_DEFER;
}
/*
* Check ACL.
* username is the name of the connected user attempting
* to access
* topic is the topic user is trying to access (may contain
* wildcards)
* acc is desired type of access: read/write
* for subscriptions (READ) (1)
* for publish (WRITE) (2)
*
* SELECT topic FROM table WHERE username = '%s' AND (acc & %d) // may user SUB or PUB topic?
* SELECT topic FROM table WHERE username = '%s' // ignore ACC
*/
int be_ldap_aclcheck(void *handle, const char *clientid, const char *username, const char *topic, int acc)
{
struct ldap_backend *conf = (struct ldap_backend *)handle;
return (conf->acldeny ? BACKEND_DENY : BACKEND_ALLOW);
}
#endif /* BE_LDAP */