2011-08-28 01:16:10 +08:00
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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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2012-12-15 00:38:18 +08:00
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* Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
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2011-08-28 01:16:10 +08:00
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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 http://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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2013-01-07 02:06:49 +08:00
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#include "curl_setup.h"
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2011-08-28 01:16:10 +08:00
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#if defined(USE_NTLM) && defined(NTLM_WB_ENABLED)
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2011-08-28 13:15:46 +08:00
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/*
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* NTLM details:
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*
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* http://davenport.sourceforge.net/ntlm.html
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* http://www.innovation.ch/java/ntlm.html
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*/
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2011-08-28 01:16:10 +08:00
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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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#ifdef HAVE_SIGNAL_H
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#include <signal.h>
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#endif
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2013-01-04 09:50:28 +08:00
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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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2011-08-28 01:16:10 +08:00
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#include "curl_ntlm_wb.h"
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2013-01-04 09:50:28 +08:00
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#include "url.h"
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#include "strerror.h"
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2011-08-28 01:16:10 +08:00
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#include "curl_memory.h"
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#define _MPRINTF_REPLACE /* use our functions only */
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#include <curl/mprintf.h>
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/* The last #include file should be: */
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2013-01-04 09:50:28 +08:00
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#include "memdebug.h"
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2011-08-28 01:16:10 +08:00
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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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2011-09-03 22:06:10 +08:00
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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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2011-08-28 01:16:10 +08:00
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#endif
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void Curl_ntlm_wb_cleanup(struct connectdata *conn)
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{
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if(conn->ntlm_auth_hlpr_socket != CURL_SOCKET_BAD) {
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sclose(conn->ntlm_auth_hlpr_socket);
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conn->ntlm_auth_hlpr_socket = CURL_SOCKET_BAD;
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}
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if(conn->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(conn->ntlm_auth_hlpr_pid, NULL, WNOHANG);
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if(ret == conn->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(conn->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(conn->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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conn->ntlm_auth_hlpr_pid = 0;
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}
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Curl_safefree(conn->challenge_header);
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conn->challenge_header = NULL;
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Curl_safefree(conn->response_header);
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conn->response_header = NULL;
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}
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static CURLcode ntlm_wb_init(struct connectdata *conn, 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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int error;
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/* Return if communication with ntlm_auth already set up */
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if(conn->ntlm_auth_hlpr_socket != CURL_SOCKET_BAD ||
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conn->ntlm_auth_hlpr_pid)
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return CURLE_OK;
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username = userp;
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slash = strpbrk(username, "\\/");
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if(slash) {
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if((domain = strdup(username)) == NULL)
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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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error = ERRNO;
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failf(conn->data, "Could not access ntlm_auth: %s errno %d: %s",
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ntlm_auth, error, Curl_strerror(conn, error));
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goto done;
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}
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if(socketpair(AF_UNIX, SOCK_STREAM, 0, sockfds)) {
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error = ERRNO;
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failf(conn->data, "Could not open socket pair. errno %d: %s",
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error, Curl_strerror(conn, error));
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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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error = ERRNO;
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sclose(sockfds[0]);
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sclose(sockfds[1]);
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failf(conn->data, "Could not fork. errno %d: %s",
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error, Curl_strerror(conn, error));
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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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2011-09-03 04:15:58 +08:00
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/* Don't use sclose in the child since it fools the socket leak detector */
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2011-09-03 22:06:10 +08:00
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sclose_nolog(sockfds[0]);
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2011-08-28 01:16:10 +08:00
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if(dup2(sockfds[1], STDIN_FILENO) == -1) {
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error = ERRNO;
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failf(conn->data, "Could not redirect child stdin. errno %d: %s",
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error, Curl_strerror(conn, error));
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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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error = ERRNO;
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failf(conn->data, "Could not redirect child stdout. errno %d: %s",
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error, Curl_strerror(conn, error));
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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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error = ERRNO;
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2011-09-03 22:06:10 +08:00
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sclose_nolog(sockfds[1]);
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2011-08-28 01:16:10 +08:00
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failf(conn->data, "Could not execl(). errno %d: %s",
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error, Curl_strerror(conn, error));
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exit(1);
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}
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sclose(sockfds[1]);
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conn->ntlm_auth_hlpr_socket = sockfds[0];
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conn->ntlm_auth_hlpr_pid = child_pid;
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Curl_safefree(domain);
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Curl_safefree(ntlm_auth_alloc);
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return CURLE_OK;
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done:
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Curl_safefree(domain);
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Curl_safefree(ntlm_auth_alloc);
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return CURLE_REMOTE_ACCESS_DENIED;
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}
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static CURLcode ntlm_wb_response(struct connectdata *conn,
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const char *input, curlntlm state)
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{
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ssize_t size;
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char buf[200]; /* enough, type 1, 3 message length is less then 200 */
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char *tmpbuf = buf;
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size_t len_in = strlen(input), len_out = sizeof(buf);
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while(len_in > 0) {
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ssize_t written = swrite(conn->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(len_out > 0) {
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size = sread(conn->ntlm_auth_hlpr_socket, tmpbuf, len_out);
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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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else if(tmpbuf[size - 1] == '\n') {
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tmpbuf[size - 1] = '\0';
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goto wrfinish;
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}
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tmpbuf += size;
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len_out -= size;
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}
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goto done;
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wrfinish:
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/* Samba/winbind installed but not configured */
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if(state == NTLMSTATE_TYPE1 &&
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size == 3 &&
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buf[0] == 'P' && buf[1] == 'W')
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return CURLE_REMOTE_ACCESS_DENIED;
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/* invalid response */
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if(size < 4)
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goto done;
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if(state == NTLMSTATE_TYPE1 &&
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(buf[0]!='Y' || buf[1]!='R' || buf[2]!=' '))
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goto done;
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if(state == NTLMSTATE_TYPE2 &&
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(buf[0]!='K' || buf[1]!='K' || buf[2]!=' ') &&
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(buf[0]!='A' || buf[1]!='F' || buf[2]!=' '))
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goto done;
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conn->response_header = aprintf("NTLM %.*s", size - 4, buf + 3);
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return CURLE_OK;
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done:
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return CURLE_REMOTE_ACCESS_DENIED;
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}
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/*
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* This is for creating ntlm header output by delegating challenge/response
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* to Samba's winbind daemon helper ntlm_auth.
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*/
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CURLcode Curl_output_ntlm_wb(struct connectdata *conn,
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bool proxy)
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{
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/* point to the address of the pointer that holds the string to send to the
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server, which is for a plain host or for a HTTP proxy */
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char **allocuserpwd;
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/* point to the name and password for this */
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const char *userp;
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/* point to the correct struct with this */
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struct ntlmdata *ntlm;
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struct auth *authp;
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CURLcode res = CURLE_OK;
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char *input;
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DEBUGASSERT(conn);
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DEBUGASSERT(conn->data);
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if(proxy) {
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allocuserpwd = &conn->allocptr.proxyuserpwd;
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userp = conn->proxyuser;
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ntlm = &conn->proxyntlm;
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authp = &conn->data->state.authproxy;
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}
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else {
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allocuserpwd = &conn->allocptr.userpwd;
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userp = conn->user;
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ntlm = &conn->ntlm;
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authp = &conn->data->state.authhost;
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}
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authp->done = FALSE;
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/* not set means empty */
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if(!userp)
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userp="";
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|
|
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switch(ntlm->state) {
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case NTLMSTATE_TYPE1:
|
|
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|
default:
|
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|
/* Use Samba's 'winbind' daemon to support NTLM authentication,
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|
* by delegating the NTLM challenge/response protocal to a helper
|
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* in ntlm_auth.
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|
* http://devel.squid-cache.org/ntlm/squid_helper_protocol.html
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|
* http://www.samba.org/samba/docs/man/manpages-3/winbindd.8.html
|
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|
* http://www.samba.org/samba/docs/man/manpages-3/ntlm_auth.1.html
|
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|
* Preprocessor symbol 'NTLM_WB_ENABLED' is defined when this
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|
* feature is enabled and 'NTLM_WB_FILE' symbol holds absolute
|
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|
|
* filename of ntlm_auth helper.
|
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|
|
* If NTLM authentication using winbind fails, go back to original
|
|
|
|
* request handling process.
|
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|
*/
|
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|
|
/* Create communication with ntlm_auth */
|
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|
|
res = ntlm_wb_init(conn, userp);
|
|
|
|
if(res)
|
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|
return res;
|
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|
|
res = ntlm_wb_response(conn, "YR\n", ntlm->state);
|
|
|
|
if(res)
|
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|
|
return res;
|
|
|
|
|
|
|
|
Curl_safefree(*allocuserpwd);
|
|
|
|
*allocuserpwd = aprintf("%sAuthorization: %s\r\n",
|
|
|
|
proxy ? "Proxy-" : "",
|
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|
|
conn->response_header);
|
|
|
|
DEBUG_OUT(fprintf(stderr, "**** Header %s\n ", *allocuserpwd));
|
|
|
|
Curl_safefree(conn->response_header);
|
|
|
|
conn->response_header = NULL;
|
|
|
|
break;
|
|
|
|
case NTLMSTATE_TYPE2:
|
|
|
|
input = aprintf("TT %s", conn->challenge_header);
|
|
|
|
if(!input)
|
|
|
|
return CURLE_OUT_OF_MEMORY;
|
|
|
|
res = ntlm_wb_response(conn, input, ntlm->state);
|
|
|
|
free(input);
|
|
|
|
input = NULL;
|
|
|
|
if(res)
|
|
|
|
return res;
|
|
|
|
|
|
|
|
Curl_safefree(*allocuserpwd);
|
|
|
|
*allocuserpwd = aprintf("%sAuthorization: %s\r\n",
|
|
|
|
proxy ? "Proxy-" : "",
|
|
|
|
conn->response_header);
|
|
|
|
DEBUG_OUT(fprintf(stderr, "**** %s\n ", *allocuserpwd));
|
|
|
|
ntlm->state = NTLMSTATE_TYPE3; /* we sent a type-3 */
|
|
|
|
authp->done = TRUE;
|
|
|
|
Curl_ntlm_wb_cleanup(conn);
|
|
|
|
break;
|
|
|
|
case NTLMSTATE_TYPE3:
|
|
|
|
/* connection is already authenticated,
|
|
|
|
* don't send a header in future requests */
|
|
|
|
if(*allocuserpwd) {
|
|
|
|
free(*allocuserpwd);
|
|
|
|
*allocuserpwd=NULL;
|
|
|
|
}
|
|
|
|
authp->done = TRUE;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return CURLE_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* USE_NTLM && NTLM_WB_ENABLED */
|