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Code Issues Releases Wiki Activity
9bf0e7b2ef
curl/lib/openldap.c
Daniel Stenberg 0c55fbab45
conn: add 'attach' to protocol handler, make libssh2 use it 
The libssh2 backend has SSH session associated with the connection but
the callback context is the easy handle, so when a connection gets
attached to a transfer, the protocol handler now allows for a custom
function to get used to set things up correctly.

Reported-by: Michael O'Farrell
Fixes #6898
Closes #7078
2021-05-17 17:57:50 +02:00

785 lines
22 KiB
C
Raw Blame History

/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2011 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 2010, Howard Chu, <hyc@openldap.org>
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "curl_setup.h"
#if !defined(CURL_DISABLE_LDAP) && defined(USE_OPENLDAP)
/*
* Notice that USE_OPENLDAP is only a source code selection switch. When
* libcurl is built with USE_OPENLDAP defined the libcurl source code that
* gets compiled is the code from openldap.c, otherwise the code that gets
* compiled is the code from ldap.c.
*
* When USE_OPENLDAP is defined a recent version of the OpenLDAP library
* might be required for compilation and runtime. In order to use ancient
* OpenLDAP library versions, USE_OPENLDAP shall not be defined.
*/
#include <ldap.h>
#include "urldata.h"
#include <curl/curl.h>
#include "sendf.h"
#include "vtls/vtls.h"
#include "transfer.h"
#include "curl_ldap.h"
#include "curl_base64.h"
#include "connect.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
/*
* Uncommenting this will enable the built-in debug logging of the openldap
* library. The debug log level can be set using the CURL_OPENLDAP_TRACE
* environment variable. The debug output is written to stderr.
*
* The library supports the following debug flags:
* LDAP_DEBUG_NONE 0x0000
* LDAP_DEBUG_TRACE 0x0001
* LDAP_DEBUG_CONSTRUCT 0x0002
* LDAP_DEBUG_DESTROY 0x0004
* LDAP_DEBUG_PARAMETER 0x0008
* LDAP_DEBUG_ANY 0xffff
*
* For example, use CURL_OPENLDAP_TRACE=0 for no debug,
* CURL_OPENLDAP_TRACE=2 for LDAP_DEBUG_CONSTRUCT messages only,
* CURL_OPENLDAP_TRACE=65535 for all debug message levels.
*/
/* #define CURL_OPENLDAP_DEBUG */
#ifndef _LDAP_PVT_H
extern int ldap_pvt_url_scheme2proto(const char *);
extern int ldap_init_fd(ber_socket_t fd, int proto, const char *url,
LDAP **ld);
#endif
static CURLcode oldap_setup_connection(struct Curl_easy *data,
struct connectdata *conn);
static CURLcode oldap_do(struct Curl_easy *data, bool *done);
static CURLcode oldap_done(struct Curl_easy *data, CURLcode, bool);
static CURLcode oldap_connect(struct Curl_easy *data, bool *done);
static CURLcode oldap_connecting(struct Curl_easy *data, bool *done);
static CURLcode oldap_disconnect(struct Curl_easy *data,
struct connectdata *conn, bool dead);
static Curl_recv oldap_recv;
/*
* LDAP protocol handler.
*/
const struct Curl_handler Curl_handler_ldap = {
"LDAP", /* scheme */
oldap_setup_connection, /* setup_connection */
oldap_do, /* do_it */
oldap_done, /* done */
ZERO_NULL, /* do_more */
oldap_connect, /* connect_it */
oldap_connecting, /* connecting */
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
oldap_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
ZERO_NULL, /* connection_check */
ZERO_NULL, /* attach connection */
PORT_LDAP, /* defport */
CURLPROTO_LDAP, /* protocol */
CURLPROTO_LDAP, /* family */
PROTOPT_NONE /* flags */
};
#ifdef USE_SSL
/*
* LDAPS protocol handler.
*/
const struct Curl_handler Curl_handler_ldaps = {
"LDAPS", /* scheme */
oldap_setup_connection, /* setup_connection */
oldap_do, /* do_it */
oldap_done, /* done */
ZERO_NULL, /* do_more */
oldap_connect, /* connect_it */
oldap_connecting, /* connecting */
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
oldap_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
ZERO_NULL, /* connection_check */
ZERO_NULL, /* attach connection */
PORT_LDAPS, /* defport */
CURLPROTO_LDAPS, /* protocol */
CURLPROTO_LDAP, /* family */
PROTOPT_SSL /* flags */
};
#endif
static const char *url_errs[] = {
"success",
"out of memory",
"bad parameter",
"unrecognized scheme",
"unbalanced delimiter",
"bad URL",
"bad host or port",
"bad or missing attributes",
"bad or missing scope",
"bad or missing filter",
"bad or missing extensions"
};
struct ldapconninfo {
LDAP *ld;
Curl_recv *recv; /* for stacking SSL handler */
Curl_send *send;
int proto;
int msgid;
bool ssldone;
bool sslinst;
bool didbind;
};
struct ldapreqinfo {
int msgid;
int nument;
};
static CURLcode oldap_setup_connection(struct Curl_easy *data,
struct connectdata *conn)
{
struct ldapconninfo *li;
LDAPURLDesc *lud;
int rc, proto;
CURLcode status;
rc = ldap_url_parse(data->state.url, &lud);
if(rc != LDAP_URL_SUCCESS) {
const char *msg = "url parsing problem";
status = CURLE_URL_MALFORMAT;
if(rc > LDAP_URL_SUCCESS && rc <= LDAP_URL_ERR_BADEXTS) {
if(rc == LDAP_URL_ERR_MEM)
status = CURLE_OUT_OF_MEMORY;
msg = url_errs[rc];
}
failf(data, "LDAP local: %s", msg);
return status;
}
proto = ldap_pvt_url_scheme2proto(lud->lud_scheme);
ldap_free_urldesc(lud);
li = calloc(1, sizeof(struct ldapconninfo));
if(!li)
return CURLE_OUT_OF_MEMORY;
li->proto = proto;
conn->proto.ldapc = li;
connkeep(conn, "OpenLDAP default");
return CURLE_OK;
}
#ifdef USE_SSL
static Sockbuf_IO ldapsb_tls;
#endif
static CURLcode oldap_connect(struct Curl_easy *data, bool *done)
{
struct connectdata *conn = data->conn;
struct ldapconninfo *li = conn->proto.ldapc;
int rc, proto = LDAP_VERSION3;
char hosturl[1024];
char *ptr;
(void)done;
strcpy(hosturl, "ldap");
ptr = hosturl + 4;
if(conn->handler->flags & PROTOPT_SSL)
*ptr++ = 's';
msnprintf(ptr, sizeof(hosturl)-(ptr-hosturl), "://%s:%d",
conn->host.name, conn->remote_port);
#ifdef CURL_OPENLDAP_DEBUG
static int do_trace = 0;
const char *env = getenv("CURL_OPENLDAP_TRACE");
do_trace = (env && strtol(env, NULL, 10) > 0);
if(do_trace) {
ldap_set_option(li->ld, LDAP_OPT_DEBUG_LEVEL, &do_trace);
}
#endif
rc = ldap_init_fd(conn->sock[FIRSTSOCKET], li->proto, hosturl, &li->ld);
if(rc) {
failf(data, "LDAP local: Cannot connect to %s, %s",
hosturl, ldap_err2string(rc));
return CURLE_COULDNT_CONNECT;
}
ldap_set_option(li->ld, LDAP_OPT_PROTOCOL_VERSION, &proto);
#ifdef USE_SSL
if(conn->handler->flags & PROTOPT_SSL) {
CURLcode result;
result = Curl_ssl_connect_nonblocking(data, conn,
FIRSTSOCKET, &li->ssldone);
if(result)
return result;
}
#endif
return CURLE_OK;
}
static CURLcode oldap_connecting(struct Curl_easy *data, bool *done)
{
struct connectdata *conn = data->conn;
struct ldapconninfo *li = conn->proto.ldapc;
LDAPMessage *msg = NULL;
struct timeval tv = {0, 1}, *tvp;
int rc, err;
char *info = NULL;
#ifdef USE_SSL
if(conn->handler->flags & PROTOPT_SSL) {
/* Is the SSL handshake complete yet? */
if(!li->ssldone) {
CURLcode result = Curl_ssl_connect_nonblocking(data, conn, FIRSTSOCKET,
&li->ssldone);
if(result || !li->ssldone)
return result;
}
/* Have we installed the libcurl SSL handlers into the sockbuf yet? */
if(!li->sslinst) {
Sockbuf *sb;
ldap_get_option(li->ld, LDAP_OPT_SOCKBUF, &sb);
ber_sockbuf_add_io(sb, &ldapsb_tls, LBER_SBIOD_LEVEL_TRANSPORT, data);
li->sslinst = TRUE;
li->recv = conn->recv[FIRSTSOCKET];
li->send = conn->send[FIRSTSOCKET];
}
}
#endif
tvp = &tv;
retry:
if(!li->didbind) {
char *binddn;
struct berval passwd;
if(conn->bits.user_passwd) {
binddn = conn->user;
passwd.bv_val = conn->passwd;
passwd.bv_len = strlen(passwd.bv_val);
}
else {
binddn = NULL;
passwd.bv_val = NULL;
passwd.bv_len = 0;
}
rc = ldap_sasl_bind(li->ld, binddn, LDAP_SASL_SIMPLE, &passwd,
NULL, NULL, &li->msgid);
if(rc)
return CURLE_LDAP_CANNOT_BIND;
li->didbind = TRUE;
if(tvp)
return CURLE_OK;
}
rc = ldap_result(li->ld, li->msgid, LDAP_MSG_ONE, tvp, &msg);
if(rc < 0) {
failf(data, "LDAP local: bind ldap_result %s", ldap_err2string(rc));
return CURLE_LDAP_CANNOT_BIND;
}
if(rc == 0) {
/* timed out */
return CURLE_OK;
}
rc = ldap_parse_result(li->ld, msg, &err, NULL, &info, NULL, NULL, 1);
if(rc) {
failf(data, "LDAP local: bind ldap_parse_result %s", ldap_err2string(rc));
return CURLE_LDAP_CANNOT_BIND;
}
/* Try to fallback to LDAPv2? */
if(err == LDAP_PROTOCOL_ERROR) {
int proto;
ldap_get_option(li->ld, LDAP_OPT_PROTOCOL_VERSION, &proto);
if(proto == LDAP_VERSION3) {
if(info) {
ldap_memfree(info);
info = NULL;
}
proto = LDAP_VERSION2;
ldap_set_option(li->ld, LDAP_OPT_PROTOCOL_VERSION, &proto);
li->didbind = FALSE;
goto retry;
}
}
if(err) {
failf(data, "LDAP remote: bind failed %s %s", ldap_err2string(rc),
info ? info : "");
if(info)
ldap_memfree(info);
return CURLE_LOGIN_DENIED;
}
if(info)
ldap_memfree(info);
conn->recv[FIRSTSOCKET] = oldap_recv;
*done = TRUE;
return CURLE_OK;
}
static CURLcode oldap_disconnect(struct Curl_easy *data,
struct connectdata *conn,
bool dead_connection)
{
struct ldapconninfo *li = conn->proto.ldapc;
(void) dead_connection;
if(li) {
if(li->ld) {
#ifdef USE_SSL
if(conn->ssl[FIRSTSOCKET].use) {
Sockbuf *sb;
ldap_get_option(li->ld, LDAP_OPT_SOCKBUF, &sb);
ber_sockbuf_add_io(sb, &ldapsb_tls, LBER_SBIOD_LEVEL_TRANSPORT, data);
}
#endif
ldap_unbind_ext(li->ld, NULL, NULL);
li->ld = NULL;
}
conn->proto.ldapc = NULL;
free(li);
}
return CURLE_OK;
}
static CURLcode oldap_do(struct Curl_easy *data, bool *done)
{
struct connectdata *conn = data->conn;
struct ldapconninfo *li = conn->proto.ldapc;
struct ldapreqinfo *lr;
CURLcode status = CURLE_OK;
int rc = 0;
LDAPURLDesc *ludp = NULL;
int msgid;
connkeep(conn, "OpenLDAP do");
infof(data, "LDAP local: %s\n", data->state.url);
rc = ldap_url_parse(data->state.url, &ludp);
if(rc != LDAP_URL_SUCCESS) {
const char *msg = "url parsing problem";
status = CURLE_URL_MALFORMAT;
if(rc > LDAP_URL_SUCCESS && rc <= LDAP_URL_ERR_BADEXTS) {
if(rc == LDAP_URL_ERR_MEM)
status = CURLE_OUT_OF_MEMORY;
msg = url_errs[rc];
}
failf(data, "LDAP local: %s", msg);
return status;
}
rc = ldap_search_ext(li->ld, ludp->lud_dn, ludp->lud_scope,
ludp->lud_filter, ludp->lud_attrs, 0,
NULL, NULL, NULL, 0, &msgid);
ldap_free_urldesc(ludp);
if(rc != LDAP_SUCCESS) {
failf(data, "LDAP local: ldap_search_ext %s", ldap_err2string(rc));
return CURLE_LDAP_SEARCH_FAILED;
}
lr = calloc(1, sizeof(struct ldapreqinfo));
if(!lr)
return CURLE_OUT_OF_MEMORY;
lr->msgid = msgid;
data->req.p.ldap = lr;
Curl_setup_transfer(data, FIRSTSOCKET, -1, FALSE, -1);
*done = TRUE;
return CURLE_OK;
}
static CURLcode oldap_done(struct Curl_easy *data, CURLcode res,
bool premature)
{
struct connectdata *conn = data->conn;
struct ldapreqinfo *lr = data->req.p.ldap;
(void)res;
(void)premature;
if(lr) {
/* if there was a search in progress, abandon it */
if(lr->msgid) {
struct ldapconninfo *li = conn->proto.ldapc;
ldap_abandon_ext(li->ld, lr->msgid, NULL, NULL);
lr->msgid = 0;
}
data->req.p.ldap = NULL;
free(lr);
}
return CURLE_OK;
}
static ssize_t oldap_recv(struct Curl_easy *data, int sockindex, char *buf,
size_t len, CURLcode *err)
{
struct connectdata *conn = data->conn;
struct ldapconninfo *li = conn->proto.ldapc;
struct ldapreqinfo *lr = data->req.p.ldap;
int rc, ret;
LDAPMessage *msg = NULL;
LDAPMessage *ent;
BerElement *ber = NULL;
struct timeval tv = {0, 1};
(void)len;
(void)buf;
(void)sockindex;
rc = ldap_result(li->ld, lr->msgid, LDAP_MSG_RECEIVED, &tv, &msg);
if(rc < 0) {
failf(data, "LDAP local: search ldap_result %s", ldap_err2string(rc));
*err = CURLE_RECV_ERROR;
return -1;
}
*err = CURLE_AGAIN;
ret = -1;
/* timed out */
if(!msg)
return ret;
for(ent = ldap_first_message(li->ld, msg); ent;
ent = ldap_next_message(li->ld, ent)) {
struct berval bv, *bvals;
int binary = 0, msgtype;
CURLcode writeerr;
msgtype = ldap_msgtype(ent);
if(msgtype == LDAP_RES_SEARCH_RESULT) {
int code;
char *info = NULL;
rc = ldap_parse_result(li->ld, ent, &code, NULL, &info, NULL, NULL, 0);
if(rc) {
failf(data, "LDAP local: search ldap_parse_result %s",
ldap_err2string(rc));
*err = CURLE_LDAP_SEARCH_FAILED;
}
else if(code && code != LDAP_SIZELIMIT_EXCEEDED) {
failf(data, "LDAP remote: search failed %s %s", ldap_err2string(rc),
info ? info : "");
*err = CURLE_LDAP_SEARCH_FAILED;
}
else {
/* successful */
if(code == LDAP_SIZELIMIT_EXCEEDED)
infof(data, "There are more than %d entries\n", lr->nument);
data->req.size = data->req.bytecount;
*err = CURLE_OK;
ret = 0;
}
lr->msgid = 0;
ldap_memfree(info);
break;
}
else if(msgtype != LDAP_RES_SEARCH_ENTRY)
continue;
lr->nument++;
rc = ldap_get_dn_ber(li->ld, ent, &ber, &bv);
if(rc < 0) {
*err = CURLE_RECV_ERROR;
return -1;
}
writeerr = Curl_client_write(data, CLIENTWRITE_BODY, (char *)"DN: ", 4);
if(writeerr) {
*err = writeerr;
return -1;
}
writeerr = Curl_client_write(data, CLIENTWRITE_BODY, (char *)bv.bv_val,
bv.bv_len);
if(writeerr) {
*err = writeerr;
return -1;
}
writeerr = Curl_client_write(data, CLIENTWRITE_BODY, (char *)"\n", 1);
if(writeerr) {
*err = writeerr;
return -1;
}
data->req.bytecount += bv.bv_len + 5;
for(rc = ldap_get_attribute_ber(li->ld, ent, ber, &bv, &bvals);
rc == LDAP_SUCCESS;
rc = ldap_get_attribute_ber(li->ld, ent, ber, &bv, &bvals)) {
int i;
if(!bv.bv_val)
break;
if(bv.bv_len > 7 && !strncmp(bv.bv_val + bv.bv_len - 7, ";binary", 7))
binary = 1;
else
binary = 0;
if(!bvals) {
writeerr = Curl_client_write(data, CLIENTWRITE_BODY, (char *)"\t", 1);
if(writeerr) {
*err = writeerr;
return -1;
}
writeerr = Curl_client_write(data, CLIENTWRITE_BODY, (char *)bv.bv_val,
bv.bv_len);
if(writeerr) {
*err = writeerr;
return -1;
}
writeerr = Curl_client_write(data, CLIENTWRITE_BODY, (char *)":\n", 2);
if(writeerr) {
*err = writeerr;
return -1;
}
data->req.bytecount += bv.bv_len + 3;
continue;
}
for(i = 0; bvals[i].bv_val != NULL; i++) {
int binval = 0;
writeerr = Curl_client_write(data, CLIENTWRITE_BODY, (char *)"\t", 1);
if(writeerr) {
*err = writeerr;
return -1;
}
writeerr = Curl_client_write(data, CLIENTWRITE_BODY, (char *)bv.bv_val,
bv.bv_len);
if(writeerr) {
*err = writeerr;
return -1;
}
writeerr = Curl_client_write(data, CLIENTWRITE_BODY, (char *)":", 1);
if(writeerr) {
*err = writeerr;
return -1;
}
data->req.bytecount += bv.bv_len + 2;
if(!binary) {
/* check for leading or trailing whitespace */
if(ISSPACE(bvals[i].bv_val[0]) ||
ISSPACE(bvals[i].bv_val[bvals[i].bv_len-1]))
binval = 1;
else {
/* check for unprintable characters */
unsigned int j;
for(j = 0; j<bvals[i].bv_len; j++)
if(!ISPRINT(bvals[i].bv_val[j])) {
binval = 1;
break;
}
}
}
if(binary || binval) {
char *val_b64 = NULL;
size_t val_b64_sz = 0;
/* Binary value, encode to base64. */
CURLcode error = Curl_base64_encode(data,
bvals[i].bv_val,
bvals[i].bv_len,
&val_b64,
&val_b64_sz);
if(error) {
ber_memfree(bvals);
ber_free(ber, 0);
ldap_msgfree(msg);
*err = error;
return -1;
}
writeerr = Curl_client_write(data, CLIENTWRITE_BODY,
(char *)": ", 2);
if(writeerr) {
*err = writeerr;
return -1;
}
data->req.bytecount += 2;
if(val_b64_sz > 0) {
writeerr = Curl_client_write(data, CLIENTWRITE_BODY, val_b64,
val_b64_sz);
if(writeerr) {
*err = writeerr;
return -1;
}
free(val_b64);
data->req.bytecount += val_b64_sz;
}
}
else {
writeerr = Curl_client_write(data, CLIENTWRITE_BODY, (char *)" ", 1);
if(writeerr) {
*err = writeerr;
return -1;
}
writeerr = Curl_client_write(data, CLIENTWRITE_BODY, bvals[i].bv_val,
bvals[i].bv_len);
if(writeerr) {
*err = writeerr;
return -1;
}
data->req.bytecount += bvals[i].bv_len + 1;
}
writeerr = Curl_client_write(data, CLIENTWRITE_BODY, (char *)"\n", 1);
if(writeerr) {
*err = writeerr;
return -1;
}
data->req.bytecount++;
}
ber_memfree(bvals);
writeerr = Curl_client_write(data, CLIENTWRITE_BODY, (char *)"\n", 1);
if(writeerr) {
*err = writeerr;
return -1;
}
data->req.bytecount++;
}
writeerr = Curl_client_write(data, CLIENTWRITE_BODY, (char *)"\n", 1);
if(writeerr) {
*err = writeerr;
return -1;
}
data->req.bytecount++;
ber_free(ber, 0);
}
ldap_msgfree(msg);
return ret;
}
#ifdef USE_SSL
static int
ldapsb_tls_setup(Sockbuf_IO_Desc *sbiod, void *arg)
{
sbiod->sbiod_pvt = arg;
return 0;
}
static int
ldapsb_tls_remove(Sockbuf_IO_Desc *sbiod)
{
sbiod->sbiod_pvt = NULL;
return 0;
}
/* We don't need to do anything because libcurl does it already */
static int
ldapsb_tls_close(Sockbuf_IO_Desc *sbiod)
{
(void)sbiod;
return 0;
}
static int
ldapsb_tls_ctrl(Sockbuf_IO_Desc *sbiod, int opt, void *arg)
{
(void)arg;
if(opt == LBER_SB_OPT_DATA_READY) {
struct Curl_easy *data = sbiod->sbiod_pvt;
return Curl_ssl_data_pending(data->conn, FIRSTSOCKET);
}
return 0;
}
static ber_slen_t
ldapsb_tls_read(Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
{
struct Curl_easy *data = sbiod->sbiod_pvt;
ber_slen_t ret = 0;
if(data) {
struct connectdata *conn = data->conn;
if(conn) {
struct ldapconninfo *li = conn->proto.ldapc;
CURLcode err = CURLE_RECV_ERROR;
ret = (li->recv)(data, FIRSTSOCKET, buf, len, &err);
if(ret < 0 && err == CURLE_AGAIN) {
SET_SOCKERRNO(EWOULDBLOCK);
}
}
}
return ret;
}
static ber_slen_t
ldapsb_tls_write(Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
{
struct Curl_easy *data = sbiod->sbiod_pvt;
ber_slen_t ret = 0;
if(data) {
struct connectdata *conn = data->conn;
if(conn) {
struct ldapconninfo *li = conn->proto.ldapc;
CURLcode err = CURLE_SEND_ERROR;
ret = (li->send)(data, FIRSTSOCKET, buf, len, &err);
if(ret < 0 && err == CURLE_AGAIN) {
SET_SOCKERRNO(EWOULDBLOCK);
}
}
}
return ret;
}
static Sockbuf_IO ldapsb_tls =
{
ldapsb_tls_setup,
ldapsb_tls_remove,
ldapsb_tls_ctrl,
ldapsb_tls_read,
ldapsb_tls_write,
ldapsb_tls_close
};
#endif /* USE_SSL */
#endif /* !CURL_DISABLE_LDAP && USE_OPENLDAP */
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