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fd00b382b2
curl/lib/http_ntlm.c
Yang Tse fd00b382b2 base64: fix Curl_base64_encode and Curl_base64_decode interfaces 
Previous interfaces for these libcurl internal functions did not allow to tell
apart a legitimate zero size result from an error condition. These functions
now return a CURLcode indicating function success or otherwise specific error.
Output size is returned using a pointer argument.

All usage of these two functions, and others closely related, has been adapted
to the new interfaces. Relative error and OOM handling adapted or added where
missing. Unit test 1302 also adapted.
2011-08-24 08:10:30 +02:00

602 lines
16 KiB
C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "setup.h"
/* NTLM details:
http://davenport.sourceforge.net/ntlm.html
http://www.innovation.ch/java/ntlm.html
*/
#ifndef CURL_DISABLE_HTTP
#ifdef USE_NTLM
#define DEBUG_ME 0
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#if (defined(NETWARE) && !defined(__NOVELL_LIBC__))
#include <netdb.h>
#endif
#include "urldata.h"
#include "non-ascii.h" /* for Curl_convert_... prototypes */
#include "sendf.h"
#include "select.h"
#include "rawstr.h"
#include "curl_base64.h"
#include "http_ntlm.h"
#include "url.h"
#include "strerror.h"
#include "curl_gethostname.h"
#include "curl_memory.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
#if defined(USE_NSS)
#include "nssg.h"
#elif defined(USE_WINDOWS_SSPI)
#include "curl_sspi.h"
#endif
/* The last #include file should be: */
#include "memdebug.h"
#if DEBUG_ME
# define DEBUG_OUT(x) x
#else
# define DEBUG_OUT(x)
#endif
CURLcode Curl_input_ntlm(struct connectdata *conn,
bool proxy, /* if proxy or not */
const char *header) /* rest of the www-authenticate:
header */
{
/* point to the correct struct with this */
struct ntlmdata *ntlm;
CURLcode result = CURLE_OK;
#ifdef USE_NSS
result = Curl_nss_force_init(conn->data);
if(result)
return result;
#endif
ntlm = proxy ? &conn->proxyntlm : &conn->ntlm;
/* skip initial whitespaces */
while(*header && ISSPACE(*header))
header++;
if(checkprefix("NTLM", header)) {
header += strlen("NTLM");
while(*header && ISSPACE(*header))
header++;
if(*header) {
result = Curl_ntlm_decode_type2_message(conn->data, header, ntlm);
if(CURLE_OK != result)
return result;
ntlm->state = NTLMSTATE_TYPE2; /* We got a type-2 message */
}
else {
if(ntlm->state >= NTLMSTATE_TYPE1) {
infof(conn->data, "NTLM handshake failure (internal error)\n");
return CURLE_REMOTE_ACCESS_DENIED;
}
ntlm->state = NTLMSTATE_TYPE1; /* We should send away a type-1 */
}
}
return result;
}
#ifdef WINBIND_NTLM_AUTH_ENABLED
static void sso_ntlm_close(struct connectdata *conn)
{
if(conn->ntlm_auth_hlpr_socket != CURL_SOCKET_BAD) {
sclose(conn->ntlm_auth_hlpr_socket);
conn->ntlm_auth_hlpr_socket = CURL_SOCKET_BAD;
}
if(conn->ntlm_auth_hlpr_pid) {
int i;
for(i = 0; i < 4; i++) {
pid_t ret = waitpid(conn->ntlm_auth_hlpr_pid, NULL, WNOHANG);
if(ret == conn->ntlm_auth_hlpr_pid || errno == ECHILD)
break;
switch(i) {
case 0:
kill(conn->ntlm_auth_hlpr_pid, SIGTERM);
break;
case 1:
/* Give the process another moment to shut down cleanly before
bringing down the axe */
Curl_wait_ms(1);
break;
case 2:
kill(conn->ntlm_auth_hlpr_pid, SIGKILL);
break;
case 3:
break;
}
}
conn->ntlm_auth_hlpr_pid = 0;
}
Curl_safefree(conn->challenge_header);
conn->challenge_header = NULL;
Curl_safefree(conn->response_header);
conn->response_header = NULL;
}
static CURLcode sso_ntlm_initiate(struct connectdata *conn,
const char *userp)
{
curl_socket_t sockfds[2];
pid_t child_pid;
const char *username;
char *slash, *domain = NULL;
const char *ntlm_auth = NULL;
char *ntlm_auth_alloc = NULL;
int error;
/* Return if communication with ntlm_auth already set up */
if(conn->ntlm_auth_hlpr_socket != CURL_SOCKET_BAD ||
conn->ntlm_auth_hlpr_pid)
return CURLE_OK;
username = userp;
slash = strpbrk(username, "\\/");
if(slash) {
if((domain = strdup(username)) == NULL)
return CURLE_OUT_OF_MEMORY;
slash = domain + (slash - username);
*slash = '\0';
username = username + (slash - domain) + 1;
}
/* For testing purposes, when DEBUGBUILD is defined and environment
variable CURL_NTLM_AUTH is set a fake_ntlm is used to perform
NTLM challenge/response which only accepts commands and output
strings pre-written in test case definitions */
#ifdef DEBUGBUILD
ntlm_auth_alloc = curl_getenv("CURL_NTLM_AUTH");
if(ntlm_auth_alloc)
ntlm_auth = ntlm_auth_alloc;
else
#endif
ntlm_auth = WINBIND_NTLM_AUTH_FILE;
if(access(ntlm_auth, X_OK) != 0) {
error = ERRNO;
failf(conn->data, "Could not access ntlm_auth: %s errno %d: %s",
ntlm_auth, error, Curl_strerror(conn, error));
goto done;
}
if(socketpair(AF_UNIX, SOCK_STREAM, 0, sockfds)) {
error = ERRNO;
failf(conn->data, "Could not open socket pair. errno %d: %s",
error, Curl_strerror(conn, error));
goto done;
}
child_pid = fork();
if(child_pid == -1) {
error = ERRNO;
sclose(sockfds[0]);
sclose(sockfds[1]);
failf(conn->data, "Could not fork. errno %d: %s",
error, Curl_strerror(conn, error));
goto done;
}
else if(!child_pid) {
/*
* child process
*/
sclose(sockfds[0]);
if(dup2(sockfds[1], STDIN_FILENO) == -1) {
error = ERRNO;
failf(conn->data, "Could not redirect child stdin. errno %d: %s",
error, Curl_strerror(conn, error));
exit(1);
}
if(dup2(sockfds[1], STDOUT_FILENO) == -1) {
error = ERRNO;
failf(conn->data, "Could not redirect child stdout. errno %d: %s",
error, Curl_strerror(conn, error));
exit(1);
}
if(domain)
execl(ntlm_auth, ntlm_auth,
"--helper-protocol", "ntlmssp-client-1",
"--use-cached-creds",
"--username", username,
"--domain", domain,
NULL);
else
execl(ntlm_auth, ntlm_auth,
"--helper-protocol", "ntlmssp-client-1",
"--use-cached-creds",
"--username", username,
NULL);
error = ERRNO;
sclose(sockfds[1]);
failf(conn->data, "Could not execl(). errno %d: %s",
error, Curl_strerror(conn, error));
exit(1);
}
sclose(sockfds[1]);
conn->ntlm_auth_hlpr_socket = sockfds[0];
conn->ntlm_auth_hlpr_pid = child_pid;
Curl_safefree(domain);
Curl_safefree(ntlm_auth_alloc);
return CURLE_OK;
done:
Curl_safefree(domain);
Curl_safefree(ntlm_auth_alloc);
return CURLE_REMOTE_ACCESS_DENIED;
}
static CURLcode sso_ntlm_response(struct connectdata *conn,
const char *input, curlntlm state)
{
ssize_t size;
char buf[200]; /* enough, type 1, 3 message length is less then 200 */
char *tmpbuf = buf;
size_t len_in = strlen(input), len_out = sizeof(buf);
while(len_in > 0) {
ssize_t written = swrite(conn->ntlm_auth_hlpr_socket, input, len_in);
if(written == -1) {
/* Interrupted by a signal, retry it */
if(errno == EINTR)
continue;
/* write failed if other errors happen */
goto done;
}
input += written;
len_in -= written;
}
/* Read one line */
while(len_out > 0) {
size = sread(conn->ntlm_auth_hlpr_socket, tmpbuf, len_out);
if(size == -1) {
if(errno == EINTR)
continue;
goto done;
}
else if(size == 0)
goto done;
else if(tmpbuf[size - 1] == '\n') {
tmpbuf[size - 1] = '\0';
goto wrfinish;
}
tmpbuf += size;
len_out -= size;
}
goto done;
wrfinish:
/* Samba/winbind installed but not configured */
if(state == NTLMSTATE_TYPE1 &&
size == 3 &&
buf[0] == 'P' && buf[1] == 'W')
return CURLE_REMOTE_ACCESS_DENIED;
/* invalid response */
if(size < 4)
goto done;
if(state == NTLMSTATE_TYPE1 &&
(buf[0]!='Y' || buf[1]!='R' || buf[2]!=' '))
goto done;
if(state == NTLMSTATE_TYPE2 &&
(buf[0]!='K' || buf[1]!='K' || buf[2]!=' ') &&
(buf[0]!='A' || buf[1]!='F' || buf[2]!=' '))
goto done;
conn->response_header = aprintf("NTLM %.*s", size - 4, buf + 3);
return CURLE_OK;
done:
return CURLE_REMOTE_ACCESS_DENIED;
}
/*
* This is for creating ntlm header output by delegating challenge/response
* to a Samba's daemon helper ntlm_auth
*/
CURLcode Curl_output_ntlm_sso(struct connectdata *conn,
bool proxy)
{
/* point to the address of the pointer that holds the string to sent to the
server, which is for a plain host or for a HTTP proxy */
char **allocuserpwd;
/* point to the name and password for this */
const char *userp;
/* point to the correct struct with this */
struct ntlmdata *ntlm;
struct auth *authp;
CURLcode res = CURLE_OK;
char *input;
DEBUGASSERT(conn);
DEBUGASSERT(conn->data);
if(proxy) {
allocuserpwd = &conn->allocptr.proxyuserpwd;
userp = conn->proxyuser;
ntlm = &conn->proxyntlm;
authp = &conn->data->state.authproxy;
}
else {
allocuserpwd = &conn->allocptr.userpwd;
userp = conn->user;
ntlm = &conn->ntlm;
authp = &conn->data->state.authhost;
}
authp->done = FALSE;
/* not set means empty */
if(!userp)
userp="";
switch(ntlm->state) {
case NTLMSTATE_TYPE1:
default:
/* Use Samba's 'winbind' daemon to support NTLM single-sign-on,
* by delegating the NTLM challenge/response protocal to a helper
* in ntlm_auth.
* http://devel.squid-cache.org/ntlm/squid_helper_protocol.html
* http://www.samba.org/samba/docs/man/manpages-3/winbindd.8.html
* http://www.samba.org/samba/docs/man/manpages-3/ntlm_auth.1.html
* Preprocessor symbol 'WINBIND_NTLM_AUTH_ENABLED' is defined when
* this feature is enabled and 'WINBIND_NTLM_AUTH_FILE' symbol holds
* absolute filename of ntlm_auth helper.
* If NTLM single-sign-on fails, go back to original request
* handling process.
*/
/* Create communication with ntlm_auth */
res = sso_ntlm_initiate(conn, userp);
if(res)
return res;
res = sso_ntlm_response(conn, "YR\n", ntlm->state);
if(res)
return res;
Curl_safefree(*allocuserpwd);
*allocuserpwd = aprintf("%sAuthorization: %s\r\n",
proxy ? "Proxy-" : "",
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 = sso_ntlm_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;
sso_ntlm_close(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 /* WINBIND_NTLM_AUTH_ENABLED */
/*
* This is for creating ntlm header output
*/
CURLcode Curl_output_ntlm(struct connectdata *conn,
bool proxy)
{
size_t size = 0;
char *base64 = NULL;
size_t base64_sz = 0;
unsigned char ntlmbuf[NTLM_BUFSIZE];
CURLcode error;
/* point to the address of the pointer that holds the string to sent to the
server, which is for a plain host or for a HTTP proxy */
char **allocuserpwd;
/* point to the name and password for this */
const char *userp;
const char *passwdp;
/* point to the correct struct with this */
struct ntlmdata *ntlm;
struct auth *authp;
DEBUGASSERT(conn);
DEBUGASSERT(conn->data);
#ifdef USE_NSS
if(CURLE_OK != Curl_nss_force_init(conn->data))
return CURLE_OUT_OF_MEMORY;
#endif
if(proxy) {
allocuserpwd = &conn->allocptr.proxyuserpwd;
userp = conn->proxyuser;
passwdp = conn->proxypasswd;
ntlm = &conn->proxyntlm;
authp = &conn->data->state.authproxy;
}
else {
allocuserpwd = &conn->allocptr.userpwd;
userp = conn->user;
passwdp = conn->passwd;
ntlm = &conn->ntlm;
authp = &conn->data->state.authhost;
}
authp->done = FALSE;
/* not set means empty */
if(!userp)
userp = "";
if(!passwdp)
passwdp = "";
#ifdef USE_WINDOWS_SSPI
if(s_hSecDll == NULL) {
/* not thread safe and leaks - use curl_global_init() to avoid */
CURLcode err = Curl_sspi_global_init();
if(s_hSecDll == NULL)
return err;
}
#endif
switch(ntlm->state) {
case NTLMSTATE_TYPE1:
default: /* for the weird cases we (re)start here */
/* Create a type-1 message */
error = Curl_ntlm_create_type1_message(userp, passwdp,
ntlm, ntlmbuf, &size);
if(error)
return error;
if(size > 0) {
/* convert the binary blob into base64 */
error = Curl_base64_encode(NULL, (char *)ntlmbuf, size,
&base64, &base64_sz);
if(error)
return error;
if(base64_sz > 0) {
Curl_safefree(*allocuserpwd);
*allocuserpwd = aprintf("%sAuthorization: NTLM %s\r\n",
proxy ? "Proxy-" : "",
base64);
DEBUG_OUT(fprintf(stderr, "**** Header %s\n ", *allocuserpwd));
free(base64);
}
}
break;
case NTLMSTATE_TYPE2:
/* We already received the type-2 message, create a type-3 message */
error = Curl_ntlm_create_type3_message(conn->data, userp, passwdp,
ntlm, ntlmbuf, &size);
if(error)
return error;
if(size > 0) {
/* convert the binary blob into base64 */
error = Curl_base64_encode(NULL, (char *)ntlmbuf, size,
&base64, &base64_sz);
if(error)
return error;
if(base64_sz > 0) {
Curl_safefree(*allocuserpwd);
*allocuserpwd = aprintf("%sAuthorization: NTLM %s\r\n",
proxy ? "Proxy-" : "",
base64);
DEBUG_OUT(fprintf(stderr, "**** %s\n ", *allocuserpwd));
free(base64);
ntlm->state = NTLMSTATE_TYPE3; /* we sent a type-3 */
authp->done = TRUE;
}
}
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;
}
void Curl_http_ntlm_cleanup(struct connectdata *conn)
{
#ifdef USE_WINDOWS_SSPI
Curl_ntlm_sspi_cleanup(&conn->ntlm);
Curl_ntlm_sspi_cleanup(&conn->proxyntlm);
#elif defined(WINBIND_NTLM_AUTH_ENABLED)
sso_ntlm_close(conn);
#else
(void)conn;
#endif
}
#endif /* USE_NTLM */
#endif /* !CURL_DISABLE_HTTP */
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