713 lines
19 KiB
C
Executable File
713 lines
19 KiB
C
Executable File
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 2010, Howard Chu, <hyc@openldap.org>
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* Copyright (C) 2011 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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#include "curl_setup.h"
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#if !defined(CURL_DISABLE_LDAP) && defined(USE_OPENLDAP)
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/*
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* Notice that USE_OPENLDAP is only a source code selection switch. When
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* libcurl is built with USE_OPENLDAP defined the libcurl source code that
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* gets compiled is the code from openldap.c, otherwise the code that gets
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* compiled is the code from ldap.c.
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*
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* When USE_OPENLDAP is defined a recent version of the OpenLDAP library
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* might be required for compilation and runtime. In order to use ancient
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* OpenLDAP library versions, USE_OPENLDAP shall not be defined.
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*/
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#include <ldap.h>
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#include "urldata.h"
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#include <curl/curl.h>
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#include "sendf.h"
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#include "vtls/vtls.h"
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#include "transfer.h"
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#include "curl_ldap.h"
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#include "curl_base64.h"
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#include "connect.h"
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#include "curl_printf.h"
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/* The last #include files should be: */
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#include "curl_memory.h"
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#include "memdebug.h"
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#ifndef _LDAP_PVT_H
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extern int ldap_pvt_url_scheme2proto(const char *);
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extern int ldap_init_fd(ber_socket_t fd, int proto, const char *url,
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LDAP **ld);
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#endif
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static CURLcode ldap_setup_connection(struct connectdata *conn);
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static CURLcode ldap_do(struct connectdata *conn, bool *done);
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static CURLcode ldap_done(struct connectdata *conn, CURLcode, bool);
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static CURLcode ldap_connect(struct connectdata *conn, bool *done);
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static CURLcode ldap_connecting(struct connectdata *conn, bool *done);
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static CURLcode ldap_disconnect(struct connectdata *conn, bool dead);
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static Curl_recv ldap_recv;
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/*
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* LDAP protocol handler.
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*/
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const struct Curl_handler Curl_handler_ldap = {
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"LDAP", /* scheme */
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ldap_setup_connection, /* setup_connection */
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ldap_do, /* do_it */
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ldap_done, /* done */
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ZERO_NULL, /* do_more */
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ldap_connect, /* connect_it */
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ldap_connecting, /* connecting */
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ZERO_NULL, /* doing */
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ZERO_NULL, /* proto_getsock */
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ZERO_NULL, /* doing_getsock */
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ZERO_NULL, /* domore_getsock */
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ZERO_NULL, /* perform_getsock */
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ldap_disconnect, /* disconnect */
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ZERO_NULL, /* readwrite */
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PORT_LDAP, /* defport */
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CURLPROTO_LDAP, /* protocol */
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PROTOPT_NONE /* flags */
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};
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#ifdef USE_SSL
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/*
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* LDAPS protocol handler.
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*/
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const struct Curl_handler Curl_handler_ldaps = {
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"LDAPS", /* scheme */
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ldap_setup_connection, /* setup_connection */
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ldap_do, /* do_it */
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ldap_done, /* done */
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ZERO_NULL, /* do_more */
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ldap_connect, /* connect_it */
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ldap_connecting, /* connecting */
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ZERO_NULL, /* doing */
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ZERO_NULL, /* proto_getsock */
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ZERO_NULL, /* doing_getsock */
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ZERO_NULL, /* domore_getsock */
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ZERO_NULL, /* perform_getsock */
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ldap_disconnect, /* disconnect */
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ZERO_NULL, /* readwrite */
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PORT_LDAPS, /* defport */
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CURLPROTO_LDAP, /* protocol */
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PROTOPT_SSL /* flags */
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};
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#endif
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static const char *url_errs[] = {
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"success",
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"out of memory",
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"bad parameter",
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"unrecognized scheme",
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"unbalanced delimiter",
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"bad URL",
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"bad host or port",
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"bad or missing attributes",
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"bad or missing scope",
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"bad or missing filter",
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"bad or missing extensions"
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};
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typedef struct ldapconninfo {
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LDAP *ld;
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Curl_recv *recv; /* for stacking SSL handler */
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Curl_send *send;
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int proto;
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int msgid;
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bool ssldone;
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bool sslinst;
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bool didbind;
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} ldapconninfo;
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typedef struct ldapreqinfo {
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int msgid;
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int nument;
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} ldapreqinfo;
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static CURLcode ldap_setup_connection(struct connectdata *conn)
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{
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ldapconninfo *li;
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LDAPURLDesc *lud;
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struct SessionHandle *data=conn->data;
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int rc, proto;
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CURLcode status;
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rc = ldap_url_parse(data->change.url, &lud);
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if(rc != LDAP_URL_SUCCESS) {
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const char *msg = "url parsing problem";
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status = CURLE_URL_MALFORMAT;
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if(rc > LDAP_URL_SUCCESS && rc <= LDAP_URL_ERR_BADEXTS) {
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if(rc == LDAP_URL_ERR_MEM)
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status = CURLE_OUT_OF_MEMORY;
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msg = url_errs[rc];
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}
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failf(conn->data, "LDAP local: %s", msg);
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return status;
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}
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proto = ldap_pvt_url_scheme2proto(lud->lud_scheme);
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ldap_free_urldesc(lud);
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li = calloc(1, sizeof(ldapconninfo));
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if(!li)
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return CURLE_OUT_OF_MEMORY;
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li->proto = proto;
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conn->proto.generic = li;
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connkeep(conn, "OpenLDAP default");
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/* TODO:
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* - provide option to choose SASL Binds instead of Simple
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*/
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return CURLE_OK;
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}
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#ifdef USE_SSL
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static Sockbuf_IO ldapsb_tls;
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#endif
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static CURLcode ldap_connect(struct connectdata *conn, bool *done)
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{
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ldapconninfo *li = conn->proto.generic;
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struct SessionHandle *data = conn->data;
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int rc, proto = LDAP_VERSION3;
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char hosturl[1024];
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char *ptr;
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(void)done;
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strcpy(hosturl, "ldap");
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ptr = hosturl+4;
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if(conn->handler->flags & PROTOPT_SSL)
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*ptr++ = 's';
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snprintf(ptr, sizeof(hosturl)-(ptr-hosturl), "://%s:%d",
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conn->host.name, conn->remote_port);
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rc = ldap_init_fd(conn->sock[FIRSTSOCKET], li->proto, hosturl, &li->ld);
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if(rc) {
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failf(data, "LDAP local: Cannot connect to %s, %s",
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hosturl, ldap_err2string(rc));
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return CURLE_COULDNT_CONNECT;
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}
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ldap_set_option(li->ld, LDAP_OPT_PROTOCOL_VERSION, &proto);
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#ifdef USE_SSL
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if(conn->handler->flags & PROTOPT_SSL) {
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CURLcode result;
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result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET, &li->ssldone);
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if(result)
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return result;
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}
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#endif
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return CURLE_OK;
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}
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static CURLcode ldap_connecting(struct connectdata *conn, bool *done)
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{
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ldapconninfo *li = conn->proto.generic;
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struct SessionHandle *data = conn->data;
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LDAPMessage *msg = NULL;
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struct timeval tv = {0, 1}, *tvp;
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int rc, err;
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char *info = NULL;
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#ifdef USE_SSL
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if(conn->handler->flags & PROTOPT_SSL) {
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/* Is the SSL handshake complete yet? */
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if(!li->ssldone) {
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CURLcode result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET,
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&li->ssldone);
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if(result || !li->ssldone)
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return result;
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}
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/* Have we installed the libcurl SSL handlers into the sockbuf yet? */
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if(!li->sslinst) {
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Sockbuf *sb;
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ldap_get_option(li->ld, LDAP_OPT_SOCKBUF, &sb);
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ber_sockbuf_add_io(sb, &ldapsb_tls, LBER_SBIOD_LEVEL_TRANSPORT, conn);
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li->sslinst = TRUE;
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li->recv = conn->recv[FIRSTSOCKET];
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li->send = conn->send[FIRSTSOCKET];
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}
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}
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#endif
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tvp = &tv;
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retry:
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if(!li->didbind) {
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char *binddn;
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struct berval passwd;
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if(conn->bits.user_passwd) {
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binddn = conn->user;
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passwd.bv_val = conn->passwd;
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passwd.bv_len = strlen(passwd.bv_val);
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}
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else {
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binddn = NULL;
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passwd.bv_val = NULL;
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passwd.bv_len = 0;
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}
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rc = ldap_sasl_bind(li->ld, binddn, LDAP_SASL_SIMPLE, &passwd,
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NULL, NULL, &li->msgid);
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if(rc)
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return CURLE_LDAP_CANNOT_BIND;
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li->didbind = TRUE;
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if(tvp)
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return CURLE_OK;
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}
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rc = ldap_result(li->ld, li->msgid, LDAP_MSG_ONE, tvp, &msg);
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if(rc < 0) {
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failf(data, "LDAP local: bind ldap_result %s", ldap_err2string(rc));
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return CURLE_LDAP_CANNOT_BIND;
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}
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if(rc == 0) {
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/* timed out */
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return CURLE_OK;
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}
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rc = ldap_parse_result(li->ld, msg, &err, NULL, &info, NULL, NULL, 1);
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if(rc) {
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failf(data, "LDAP local: bind ldap_parse_result %s", ldap_err2string(rc));
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return CURLE_LDAP_CANNOT_BIND;
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}
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/* Try to fallback to LDAPv2? */
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if(err == LDAP_PROTOCOL_ERROR) {
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int proto;
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ldap_get_option(li->ld, LDAP_OPT_PROTOCOL_VERSION, &proto);
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if(proto == LDAP_VERSION3) {
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if(info) {
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ldap_memfree(info);
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info = NULL;
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}
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proto = LDAP_VERSION2;
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ldap_set_option(li->ld, LDAP_OPT_PROTOCOL_VERSION, &proto);
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li->didbind = FALSE;
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goto retry;
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}
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}
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if(err) {
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failf(data, "LDAP remote: bind failed %s %s", ldap_err2string(rc),
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info ? info : "");
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if(info)
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ldap_memfree(info);
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return CURLE_LOGIN_DENIED;
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}
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if(info)
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ldap_memfree(info);
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conn->recv[FIRSTSOCKET] = ldap_recv;
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*done = TRUE;
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return CURLE_OK;
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}
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static CURLcode ldap_disconnect(struct connectdata *conn, bool dead_connection)
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{
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ldapconninfo *li = conn->proto.generic;
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(void) dead_connection;
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if(li) {
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if(li->ld) {
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ldap_unbind_ext(li->ld, NULL, NULL);
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li->ld = NULL;
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}
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conn->proto.generic = NULL;
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free(li);
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}
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return CURLE_OK;
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}
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static CURLcode ldap_do(struct connectdata *conn, bool *done)
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{
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ldapconninfo *li = conn->proto.generic;
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ldapreqinfo *lr;
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CURLcode status = CURLE_OK;
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int rc = 0;
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LDAPURLDesc *ludp = NULL;
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int msgid;
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struct SessionHandle *data=conn->data;
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connkeep(conn, "OpenLDAP do");
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infof(data, "LDAP local: %s\n", data->change.url);
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rc = ldap_url_parse(data->change.url, &ludp);
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if(rc != LDAP_URL_SUCCESS) {
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const char *msg = "url parsing problem";
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status = CURLE_URL_MALFORMAT;
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if(rc > LDAP_URL_SUCCESS && rc <= LDAP_URL_ERR_BADEXTS) {
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if(rc == LDAP_URL_ERR_MEM)
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status = CURLE_OUT_OF_MEMORY;
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msg = url_errs[rc];
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}
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failf(conn->data, "LDAP local: %s", msg);
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return status;
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}
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rc = ldap_search_ext(li->ld, ludp->lud_dn, ludp->lud_scope,
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ludp->lud_filter, ludp->lud_attrs, 0,
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NULL, NULL, NULL, 0, &msgid);
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ldap_free_urldesc(ludp);
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if(rc != LDAP_SUCCESS) {
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failf(data, "LDAP local: ldap_search_ext %s", ldap_err2string(rc));
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return CURLE_LDAP_SEARCH_FAILED;
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}
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lr = calloc(1, sizeof(ldapreqinfo));
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if(!lr)
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return CURLE_OUT_OF_MEMORY;
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lr->msgid = msgid;
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data->req.protop = lr;
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Curl_setup_transfer(conn, FIRSTSOCKET, -1, FALSE, NULL, -1, NULL);
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*done = TRUE;
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return CURLE_OK;
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}
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static CURLcode ldap_done(struct connectdata *conn, CURLcode res,
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bool premature)
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{
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ldapreqinfo *lr = conn->data->req.protop;
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(void)res;
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(void)premature;
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if(lr) {
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/* if there was a search in progress, abandon it */
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if(lr->msgid) {
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ldapconninfo *li = conn->proto.generic;
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ldap_abandon_ext(li->ld, lr->msgid, NULL, NULL);
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lr->msgid = 0;
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}
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conn->data->req.protop = NULL;
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free(lr);
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}
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return CURLE_OK;
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}
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static ssize_t ldap_recv(struct connectdata *conn, int sockindex, char *buf,
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size_t len, CURLcode *err)
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{
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ldapconninfo *li = conn->proto.generic;
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struct SessionHandle *data = conn->data;
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ldapreqinfo *lr = data->req.protop;
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int rc, ret;
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LDAPMessage *msg = NULL;
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LDAPMessage *ent;
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BerElement *ber = NULL;
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struct timeval tv = {0, 1};
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(void)len;
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(void)buf;
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(void)sockindex;
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rc = ldap_result(li->ld, lr->msgid, LDAP_MSG_RECEIVED, &tv, &msg);
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if(rc < 0) {
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failf(data, "LDAP local: search ldap_result %s", ldap_err2string(rc));
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*err = CURLE_RECV_ERROR;
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return -1;
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}
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*err = CURLE_AGAIN;
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ret = -1;
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/* timed out */
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if(!msg)
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return ret;
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for(ent = ldap_first_message(li->ld, msg); ent;
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ent = ldap_next_message(li->ld, ent)) {
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struct berval bv, *bvals, **bvp = &bvals;
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int binary = 0, msgtype;
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CURLcode writeerr;
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msgtype = ldap_msgtype(ent);
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if(msgtype == LDAP_RES_SEARCH_RESULT) {
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int code;
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char *info = NULL;
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rc = ldap_parse_result(li->ld, ent, &code, NULL, &info, NULL, NULL, 0);
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if(rc) {
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failf(data, "LDAP local: search ldap_parse_result %s",
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ldap_err2string(rc));
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*err = CURLE_LDAP_SEARCH_FAILED;
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}
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else if(code && code != LDAP_SIZELIMIT_EXCEEDED) {
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failf(data, "LDAP remote: search failed %s %s", ldap_err2string(rc),
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info ? info : "");
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*err = CURLE_LDAP_SEARCH_FAILED;
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}
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else {
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/* successful */
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if(code == LDAP_SIZELIMIT_EXCEEDED)
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infof(data, "There are more than %d entries\n", lr->nument);
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data->req.size = data->req.bytecount;
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*err = CURLE_OK;
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ret = 0;
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}
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lr->msgid = 0;
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ldap_memfree(info);
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break;
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}
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else if(msgtype != LDAP_RES_SEARCH_ENTRY)
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continue;
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lr->nument++;
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rc = ldap_get_dn_ber(li->ld, ent, &ber, &bv);
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if(rc < 0) {
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/* TODO: verify that this is really how this return code should be
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handled */
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*err = CURLE_RECV_ERROR;
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return -1;
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}
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writeerr = Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"DN: ", 4);
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if(writeerr) {
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*err = writeerr;
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return -1;
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}
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writeerr = Curl_client_write(conn, CLIENTWRITE_BODY, (char *)bv.bv_val,
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bv.bv_len);
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if(writeerr) {
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*err = writeerr;
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return -1;
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}
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writeerr = Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"\n", 1);
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if(writeerr) {
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*err = writeerr;
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return -1;
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}
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data->req.bytecount += bv.bv_len + 5;
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for(rc = ldap_get_attribute_ber(li->ld, ent, ber, &bv, bvp);
|
|
rc == LDAP_SUCCESS;
|
|
rc = ldap_get_attribute_ber(li->ld, ent, ber, &bv, bvp)) {
|
|
int i;
|
|
|
|
if(bv.bv_val == NULL) break;
|
|
|
|
if(bv.bv_len > 7 && !strncmp(bv.bv_val + bv.bv_len - 7, ";binary", 7))
|
|
binary = 1;
|
|
else
|
|
binary = 0;
|
|
|
|
for(i=0; bvals[i].bv_val != NULL; i++) {
|
|
int binval = 0;
|
|
writeerr = Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"\t", 1);
|
|
if(writeerr) {
|
|
*err = writeerr;
|
|
return -1;
|
|
}
|
|
|
|
writeerr = Curl_client_write(conn, CLIENTWRITE_BODY, (char *)bv.bv_val,
|
|
bv.bv_len);
|
|
if(writeerr) {
|
|
*err = writeerr;
|
|
return -1;
|
|
}
|
|
|
|
writeerr = Curl_client_write(conn, 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(conn, CLIENTWRITE_BODY,
|
|
(char *)": ", 2);
|
|
if(writeerr) {
|
|
*err = writeerr;
|
|
return -1;
|
|
}
|
|
|
|
data->req.bytecount += 2;
|
|
if(val_b64_sz > 0) {
|
|
writeerr = Curl_client_write(conn, 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(conn, CLIENTWRITE_BODY, (char *)" ", 1);
|
|
if(writeerr) {
|
|
*err = writeerr;
|
|
return -1;
|
|
}
|
|
|
|
writeerr = Curl_client_write(conn, 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(conn, CLIENTWRITE_BODY, (char *)"\n", 0);
|
|
if(writeerr) {
|
|
*err = writeerr;
|
|
return -1;
|
|
}
|
|
|
|
data->req.bytecount++;
|
|
}
|
|
ber_memfree(bvals);
|
|
writeerr = Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"\n", 0);
|
|
if(writeerr) {
|
|
*err = writeerr;
|
|
return -1;
|
|
}
|
|
data->req.bytecount++;
|
|
}
|
|
writeerr = Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"\n", 0);
|
|
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 connectdata *conn = sbiod->sbiod_pvt;
|
|
return Curl_ssl_data_pending(conn, FIRSTSOCKET);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static ber_slen_t
|
|
ldapsb_tls_read(Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
|
|
{
|
|
struct connectdata *conn = sbiod->sbiod_pvt;
|
|
ldapconninfo *li = conn->proto.generic;
|
|
ber_slen_t ret;
|
|
CURLcode err = CURLE_RECV_ERROR;
|
|
|
|
ret = li->recv(conn, 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 connectdata *conn = sbiod->sbiod_pvt;
|
|
ldapconninfo *li = conn->proto.generic;
|
|
ber_slen_t ret;
|
|
CURLcode err = CURLE_SEND_ERROR;
|
|
|
|
ret = li->send(conn, 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 */
|