499 lines
14 KiB
C
499 lines
14 KiB
C
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/***************************************************************************
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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) 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.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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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#if !defined(CURL_DISABLE_HTTP) && defined(USE_NTLM) && \
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defined(NTLM_WB_ENABLED)
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/*
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* NTLM details:
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*
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* https://davenport.sourceforge.net/ntlm.html
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* https://www.innovation.ch/java/ntlm.html
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*/
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#define DEBUG_ME 0
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#ifdef HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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#include <signal.h>
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#ifdef HAVE_PWD_H
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#include <pwd.h>
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#endif
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#include "urldata.h"
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#include "sendf.h"
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#include "select.h"
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#include "vauth/ntlm.h"
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#include "curl_ntlm_core.h"
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#include "curl_ntlm_wb.h"
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#include "url.h"
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#include "strerror.h"
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#include "strdup.h"
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#include "strcase.h"
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/* The last 3 #include files should be in this order */
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#include "curl_printf.h"
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#include "curl_memory.h"
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#include "memdebug.h"
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#if DEBUG_ME
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# define DEBUG_OUT(x) x
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#else
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# define DEBUG_OUT(x) Curl_nop_stmt
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#endif
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/* Portable 'sclose_nolog' used only in child process instead of 'sclose'
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to avoid fooling the socket leak detector */
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#if defined(HAVE_CLOSESOCKET)
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# define sclose_nolog(x) closesocket((x))
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#elif defined(HAVE_CLOSESOCKET_CAMEL)
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# define sclose_nolog(x) CloseSocket((x))
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#else
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# define sclose_nolog(x) close((x))
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#endif
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static void ntlm_wb_cleanup(struct ntlmdata *ntlm)
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{
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if(ntlm->ntlm_auth_hlpr_socket != CURL_SOCKET_BAD) {
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sclose(ntlm->ntlm_auth_hlpr_socket);
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ntlm->ntlm_auth_hlpr_socket = CURL_SOCKET_BAD;
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}
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if(ntlm->ntlm_auth_hlpr_pid) {
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int i;
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for(i = 0; i < 4; i++) {
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pid_t ret = waitpid(ntlm->ntlm_auth_hlpr_pid, NULL, WNOHANG);
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if(ret == ntlm->ntlm_auth_hlpr_pid || errno == ECHILD)
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break;
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switch(i) {
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case 0:
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kill(ntlm->ntlm_auth_hlpr_pid, SIGTERM);
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break;
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case 1:
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/* Give the process another moment to shut down cleanly before
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bringing down the axe */
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Curl_wait_ms(1);
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break;
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case 2:
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kill(ntlm->ntlm_auth_hlpr_pid, SIGKILL);
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break;
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case 3:
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break;
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}
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}
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ntlm->ntlm_auth_hlpr_pid = 0;
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}
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Curl_safefree(ntlm->challenge);
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Curl_safefree(ntlm->response);
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}
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static CURLcode ntlm_wb_init(struct Curl_easy *data, struct ntlmdata *ntlm,
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const char *userp)
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{
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curl_socket_t sockfds[2];
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pid_t child_pid;
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const char *username;
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char *slash, *domain = NULL;
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const char *ntlm_auth = NULL;
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char *ntlm_auth_alloc = NULL;
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#if defined(HAVE_GETPWUID_R) && defined(HAVE_GETEUID)
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struct passwd pw, *pw_res;
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char pwbuf[1024];
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#endif
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char buffer[STRERROR_LEN];
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#if defined(CURL_DISABLE_VERBOSE_STRINGS)
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(void) data;
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#endif
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/* Return if communication with ntlm_auth already set up */
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if(ntlm->ntlm_auth_hlpr_socket != CURL_SOCKET_BAD ||
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ntlm->ntlm_auth_hlpr_pid)
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return CURLE_OK;
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username = userp;
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/* The real ntlm_auth really doesn't like being invoked with an
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empty username. It won't make inferences for itself, and expects
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the client to do so (mostly because it's really designed for
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servers like squid to use for auth, and client support is an
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afterthought for it). So try hard to provide a suitable username
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if we don't already have one. But if we can't, provide the
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empty one anyway. Perhaps they have an implementation of the
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ntlm_auth helper which *doesn't* need it so we might as well try */
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if(!username || !username[0]) {
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username = getenv("NTLMUSER");
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if(!username || !username[0])
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username = getenv("LOGNAME");
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if(!username || !username[0])
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username = getenv("USER");
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#if defined(HAVE_GETPWUID_R) && defined(HAVE_GETEUID)
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if((!username || !username[0]) &&
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!getpwuid_r(geteuid(), &pw, pwbuf, sizeof(pwbuf), &pw_res) &&
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pw_res) {
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username = pw.pw_name;
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}
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#endif
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if(!username || !username[0])
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username = userp;
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}
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slash = strpbrk(username, "\\/");
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if(slash) {
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domain = strdup(username);
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if(!domain)
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return CURLE_OUT_OF_MEMORY;
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slash = domain + (slash - username);
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*slash = '\0';
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username = username + (slash - domain) + 1;
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}
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/* For testing purposes, when DEBUGBUILD is defined and environment
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variable CURL_NTLM_WB_FILE is set a fake_ntlm is used to perform
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NTLM challenge/response which only accepts commands and output
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strings pre-written in test case definitions */
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#ifdef DEBUGBUILD
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ntlm_auth_alloc = curl_getenv("CURL_NTLM_WB_FILE");
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if(ntlm_auth_alloc)
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ntlm_auth = ntlm_auth_alloc;
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else
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#endif
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ntlm_auth = NTLM_WB_FILE;
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if(access(ntlm_auth, X_OK) != 0) {
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failf(data, "Could not access ntlm_auth: %s errno %d: %s",
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ntlm_auth, errno, Curl_strerror(errno, buffer, sizeof(buffer)));
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goto done;
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}
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if(Curl_socketpair(AF_UNIX, SOCK_STREAM, 0, sockfds)) {
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failf(data, "Could not open socket pair. errno %d: %s",
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errno, Curl_strerror(errno, buffer, sizeof(buffer)));
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goto done;
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}
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child_pid = fork();
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if(child_pid == -1) {
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sclose(sockfds[0]);
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sclose(sockfds[1]);
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failf(data, "Could not fork. errno %d: %s",
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errno, Curl_strerror(errno, buffer, sizeof(buffer)));
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goto done;
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}
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else if(!child_pid) {
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/*
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* child process
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*/
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/* Don't use sclose in the child since it fools the socket leak detector */
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sclose_nolog(sockfds[0]);
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if(dup2(sockfds[1], STDIN_FILENO) == -1) {
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failf(data, "Could not redirect child stdin. errno %d: %s",
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errno, Curl_strerror(errno, buffer, sizeof(buffer)));
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exit(1);
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}
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if(dup2(sockfds[1], STDOUT_FILENO) == -1) {
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failf(data, "Could not redirect child stdout. errno %d: %s",
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errno, Curl_strerror(errno, buffer, sizeof(buffer)));
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exit(1);
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}
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if(domain)
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execl(ntlm_auth, ntlm_auth,
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"--helper-protocol", "ntlmssp-client-1",
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"--use-cached-creds",
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"--username", username,
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"--domain", domain,
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NULL);
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else
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execl(ntlm_auth, ntlm_auth,
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"--helper-protocol", "ntlmssp-client-1",
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"--use-cached-creds",
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"--username", username,
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NULL);
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sclose_nolog(sockfds[1]);
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failf(data, "Could not execl(). errno %d: %s",
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errno, Curl_strerror(errno, buffer, sizeof(buffer)));
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exit(1);
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}
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sclose(sockfds[1]);
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ntlm->ntlm_auth_hlpr_socket = sockfds[0];
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ntlm->ntlm_auth_hlpr_pid = child_pid;
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free(domain);
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free(ntlm_auth_alloc);
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return CURLE_OK;
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done:
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free(domain);
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free(ntlm_auth_alloc);
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return CURLE_REMOTE_ACCESS_DENIED;
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}
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/* if larger than this, something is seriously wrong */
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#define MAX_NTLM_WB_RESPONSE 100000
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static CURLcode ntlm_wb_response(struct Curl_easy *data, struct ntlmdata *ntlm,
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const char *input, curlntlm state)
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{
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size_t len_in = strlen(input), len_out = 0;
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struct dynbuf b;
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char *ptr = NULL;
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unsigned char *buf = (unsigned char *)data->state.buffer;
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Curl_dyn_init(&b, MAX_NTLM_WB_RESPONSE);
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while(len_in > 0) {
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ssize_t written = swrite(ntlm->ntlm_auth_hlpr_socket, input, len_in);
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if(written == -1) {
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/* Interrupted by a signal, retry it */
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if(errno == EINTR)
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continue;
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/* write failed if other errors happen */
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goto done;
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}
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input += written;
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len_in -= written;
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}
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/* Read one line */
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while(1) {
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ssize_t size =
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sread(ntlm->ntlm_auth_hlpr_socket, buf, data->set.buffer_size);
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if(size == -1) {
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if(errno == EINTR)
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continue;
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goto done;
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}
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else if(size == 0)
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goto done;
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if(Curl_dyn_addn(&b, buf, size))
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goto done;
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len_out = Curl_dyn_len(&b);
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ptr = Curl_dyn_ptr(&b);
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if(len_out && ptr[len_out - 1] == '\n') {
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ptr[len_out - 1] = '\0';
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break; /* done! */
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}
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/* loop */
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}
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/* Samba/winbind installed but not configured */
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if(state == NTLMSTATE_TYPE1 &&
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len_out == 3 &&
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ptr[0] == 'P' && ptr[1] == 'W')
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goto done;
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/* invalid response */
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if(len_out < 4)
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goto done;
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if(state == NTLMSTATE_TYPE1 &&
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(ptr[0]!='Y' || ptr[1]!='R' || ptr[2]!=' '))
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goto done;
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if(state == NTLMSTATE_TYPE2 &&
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(ptr[0]!='K' || ptr[1]!='K' || ptr[2]!=' ') &&
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(ptr[0]!='A' || ptr[1]!='F' || ptr[2]!=' '))
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goto done;
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ntlm->response = strdup(ptr + 3);
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Curl_dyn_free(&b);
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if(!ntlm->response)
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return CURLE_OUT_OF_MEMORY;
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return CURLE_OK;
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done:
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Curl_dyn_free(&b);
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return CURLE_REMOTE_ACCESS_DENIED;
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}
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CURLcode Curl_input_ntlm_wb(struct Curl_easy *data,
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struct connectdata *conn,
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bool proxy,
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const char *header)
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{
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struct ntlmdata *ntlm = proxy ? &conn->proxyntlm : &conn->ntlm;
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curlntlm *state = proxy ? &conn->proxy_ntlm_state : &conn->http_ntlm_state;
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(void) data; /* In case it gets unused by nop log macros. */
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if(!checkprefix("NTLM", header))
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return CURLE_BAD_CONTENT_ENCODING;
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header += strlen("NTLM");
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while(*header && ISSPACE(*header))
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header++;
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if(*header) {
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ntlm->challenge = strdup(header);
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if(!ntlm->challenge)
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return CURLE_OUT_OF_MEMORY;
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*state = NTLMSTATE_TYPE2; /* We got a type-2 message */
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}
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else {
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if(*state == NTLMSTATE_LAST) {
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infof(data, "NTLM auth restarted");
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Curl_http_auth_cleanup_ntlm_wb(conn);
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}
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else if(*state == NTLMSTATE_TYPE3) {
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infof(data, "NTLM handshake rejected");
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Curl_http_auth_cleanup_ntlm_wb(conn);
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*state = NTLMSTATE_NONE;
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return CURLE_REMOTE_ACCESS_DENIED;
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}
|
||
|
|
else if(*state >= NTLMSTATE_TYPE1) {
|
||
|
|
infof(data, "NTLM handshake failure (internal error)");
|
||
|
|
return CURLE_REMOTE_ACCESS_DENIED;
|
||
|
|
}
|
||
|
|
|
||
|
|
*state = NTLMSTATE_TYPE1; /* We should send away a type-1 */
|
||
|
|
}
|
||
|
|
|
||
|
|
return CURLE_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This is for creating ntlm header output by delegating challenge/response
|
||
|
|
* to Samba's winbind daemon helper ntlm_auth.
|
||
|
|
*/
|
||
|
|
CURLcode Curl_output_ntlm_wb(struct Curl_easy *data, struct connectdata *conn,
|
||
|
|
bool proxy)
|
||
|
|
{
|
||
|
|
/* point to the address of the pointer that holds the string to send to the
|
||
|
|
server, which is for a plain host or for an HTTP proxy */
|
||
|
|
char **allocuserpwd;
|
||
|
|
/* point to the name and password for this */
|
||
|
|
const char *userp;
|
||
|
|
struct ntlmdata *ntlm;
|
||
|
|
curlntlm *state;
|
||
|
|
struct auth *authp;
|
||
|
|
|
||
|
|
CURLcode res = CURLE_OK;
|
||
|
|
|
||
|
|
DEBUGASSERT(conn);
|
||
|
|
DEBUGASSERT(data);
|
||
|
|
|
||
|
|
if(proxy) {
|
||
|
|
#ifndef CURL_DISABLE_PROXY
|
||
|
|
allocuserpwd = &data->state.aptr.proxyuserpwd;
|
||
|
|
userp = conn->http_proxy.user;
|
||
|
|
ntlm = &conn->proxyntlm;
|
||
|
|
state = &conn->proxy_ntlm_state;
|
||
|
|
authp = &data->state.authproxy;
|
||
|
|
#else
|
||
|
|
return CURLE_NOT_BUILT_IN;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
allocuserpwd = &data->state.aptr.userpwd;
|
||
|
|
userp = conn->user;
|
||
|
|
ntlm = &conn->ntlm;
|
||
|
|
state = &conn->http_ntlm_state;
|
||
|
|
authp = &data->state.authhost;
|
||
|
|
}
|
||
|
|
authp->done = FALSE;
|
||
|
|
|
||
|
|
/* not set means empty */
|
||
|
|
if(!userp)
|
||
|
|
userp = "";
|
||
|
|
|
||
|
|
switch(*state) {
|
||
|
|
case NTLMSTATE_TYPE1:
|
||
|
|
default:
|
||
|
|
/* Use Samba's 'winbind' daemon to support NTLM authentication,
|
||
|
|
* by delegating the NTLM challenge/response protocol to a helper
|
||
|
|
* in ntlm_auth.
|
||
|
|
* https://web.archive.org/web/20190925164737
|
||
|
|
* /devel.squid-cache.org/ntlm/squid_helper_protocol.html
|
||
|
|
* https://www.samba.org/samba/docs/man/manpages-3/winbindd.8.html
|
||
|
|
* https://www.samba.org/samba/docs/man/manpages-3/ntlm_auth.1.html
|
||
|
|
* Preprocessor symbol 'NTLM_WB_ENABLED' is defined when this
|
||
|
|
* feature is enabled and 'NTLM_WB_FILE' symbol holds absolute
|
||
|
|
* filename of ntlm_auth helper.
|
||
|
|
* If NTLM authentication using winbind fails, go back to original
|
||
|
|
* request handling process.
|
||
|
|
*/
|
||
|
|
/* Create communication with ntlm_auth */
|
||
|
|
res = ntlm_wb_init(data, ntlm, userp);
|
||
|
|
if(res)
|
||
|
|
return res;
|
||
|
|
res = ntlm_wb_response(data, ntlm, "YR\n", *state);
|
||
|
|
if(res)
|
||
|
|
return res;
|
||
|
|
|
||
|
|
free(*allocuserpwd);
|
||
|
|
*allocuserpwd = aprintf("%sAuthorization: NTLM %s\r\n",
|
||
|
|
proxy ? "Proxy-" : "",
|
||
|
|
ntlm->response);
|
||
|
|
DEBUG_OUT(fprintf(stderr, "**** Header %s\n ", *allocuserpwd));
|
||
|
|
Curl_safefree(ntlm->response);
|
||
|
|
if(!*allocuserpwd)
|
||
|
|
return CURLE_OUT_OF_MEMORY;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case NTLMSTATE_TYPE2: {
|
||
|
|
char *input = aprintf("TT %s\n", ntlm->challenge);
|
||
|
|
if(!input)
|
||
|
|
return CURLE_OUT_OF_MEMORY;
|
||
|
|
res = ntlm_wb_response(data, ntlm, input, *state);
|
||
|
|
free(input);
|
||
|
|
if(res)
|
||
|
|
return res;
|
||
|
|
|
||
|
|
free(*allocuserpwd);
|
||
|
|
*allocuserpwd = aprintf("%sAuthorization: NTLM %s\r\n",
|
||
|
|
proxy ? "Proxy-" : "",
|
||
|
|
ntlm->response);
|
||
|
|
DEBUG_OUT(fprintf(stderr, "**** %s\n ", *allocuserpwd));
|
||
|
|
*state = NTLMSTATE_TYPE3; /* we sent a type-3 */
|
||
|
|
authp->done = TRUE;
|
||
|
|
Curl_http_auth_cleanup_ntlm_wb(conn);
|
||
|
|
if(!*allocuserpwd)
|
||
|
|
return CURLE_OUT_OF_MEMORY;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
case NTLMSTATE_TYPE3:
|
||
|
|
/* connection is already authenticated,
|
||
|
|
* don't send a header in future requests */
|
||
|
|
*state = NTLMSTATE_LAST;
|
||
|
|
/* FALLTHROUGH */
|
||
|
|
case NTLMSTATE_LAST:
|
||
|
|
Curl_safefree(*allocuserpwd);
|
||
|
|
authp->done = TRUE;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return CURLE_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
void Curl_http_auth_cleanup_ntlm_wb(struct connectdata *conn)
|
||
|
|
{
|
||
|
|
ntlm_wb_cleanup(&conn->ntlm);
|
||
|
|
ntlm_wb_cleanup(&conn->proxyntlm);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* !CURL_DISABLE_HTTP && USE_NTLM && NTLM_WB_ENABLED */
|