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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 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 https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#if !defined(CURL_DISABLE_HTTP) && defined(USE_NTLM)
/*
* NTLM details:
*
* https://davenport.sourceforge.net/ntlm.html
* https://www.innovation.ch/java/ntlm.html
*/
#define DEBUG_ME 0
#include "urldata.h"
#include "sendf.h"
#include "strcase.h"
#include "http_ntlm.h"
#include "curl_ntlm_core.h"
#include "curl_base64.h"
#include "vauth/vauth.h"
#include "url.h"
/* SSL backend-specific #if branches in this file must be kept in the order
documented in curl_ntlm_core. */
#if defined(USE_WINDOWS_SSPI)
#include "curl_sspi.h"
#endif
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
#if DEBUG_ME
# define DEBUG_OUT(x) x
#else
# define DEBUG_OUT(x) Curl_nop_stmt
#endif
CURLcode Curl_input_ntlm(struct Curl_easy *data,
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;
curlntlm *state;
CURLcode result = CURLE_OK;
struct connectdata *conn = data->conn;
ntlm = proxy ? &conn->proxyntlm : &conn->ntlm;
state = proxy ? &conn->proxy_ntlm_state : &conn->http_ntlm_state;
if(checkprefix("NTLM", header)) {
header += strlen("NTLM");
while(*header && ISSPACE(*header))
header++;
if(*header) {
unsigned char *hdr;
size_t hdrlen;
result = Curl_base64_decode(header, &hdr, &hdrlen);
if(!result) {
struct bufref hdrbuf;
Curl_bufref_init(&hdrbuf);
Curl_bufref_set(&hdrbuf, hdr, hdrlen, curl_free);
result = Curl_auth_decode_ntlm_type2_message(data, &hdrbuf, ntlm);
Curl_bufref_free(&hdrbuf);
}
if(result)
return result;
*state = NTLMSTATE_TYPE2; /* We got a type-2 message */
}
else {
if(*state == NTLMSTATE_LAST) {
infof(data, "NTLM auth restarted");
Curl_http_auth_cleanup_ntlm(conn);
}
else if(*state == NTLMSTATE_TYPE3) {
infof(data, "NTLM handshake rejected");
Curl_http_auth_cleanup_ntlm(conn);
*state = NTLMSTATE_NONE;
return CURLE_REMOTE_ACCESS_DENIED;
}
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 result;
}
/*
* This is for creating NTLM header output
*/
CURLcode Curl_output_ntlm(struct Curl_easy *data, bool proxy)
{
char *base64 = NULL;
size_t len = 0;
CURLcode result = CURLE_OK;
struct bufref ntlmmsg;
/* 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 username, password, service and host */
const char *userp;
const char *passwdp;
const char *service = NULL;
const char *hostname = NULL;
/* point to the correct struct with this */
struct ntlmdata *ntlm;
curlntlm *state;
struct auth *authp;
struct connectdata *conn = data->conn;
DEBUGASSERT(conn);
DEBUGASSERT(data);
if(proxy) {
#ifndef CURL_DISABLE_PROXY
allocuserpwd = &data->state.aptr.proxyuserpwd;
userp = data->state.aptr.proxyuser;
passwdp = data->state.aptr.proxypasswd;
service = data->set.str[STRING_PROXY_SERVICE_NAME] ?
data->set.str[STRING_PROXY_SERVICE_NAME] : "HTTP";
hostname = conn->http_proxy.host.name;
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 = data->state.aptr.user;
passwdp = data->state.aptr.passwd;
service = data->set.str[STRING_SERVICE_NAME] ?
data->set.str[STRING_SERVICE_NAME] : "HTTP";
hostname = conn->host.name;
ntlm = &conn->ntlm;
state = &conn->http_ntlm_state;
authp = &data->state.authhost;
}
authp->done = FALSE;
/* not set means empty */
if(!userp)
userp = "";
if(!passwdp)
passwdp = "";
#ifdef USE_WINDOWS_SSPI
if(!Curl_hSecDll) {
/* not thread safe and leaks - use curl_global_init() to avoid */
CURLcode err = Curl_sspi_global_init();
if(!Curl_hSecDll)
return err;
}
#ifdef SECPKG_ATTR_ENDPOINT_BINDINGS
ntlm->sslContext = conn->sslContext;
#endif
#endif
Curl_bufref_init(&ntlmmsg);
/* connection is already authenticated, do not send a header in future
* requests so go directly to NTLMSTATE_LAST */
if(*state == NTLMSTATE_TYPE3)
*state = NTLMSTATE_LAST;
switch(*state) {
case NTLMSTATE_TYPE1:
default: /* for the weird cases we (re)start here */
/* Create a type-1 message */
result = Curl_auth_create_ntlm_type1_message(data, userp, passwdp,
service, hostname,
ntlm, &ntlmmsg);
if(!result) {
DEBUGASSERT(Curl_bufref_len(&ntlmmsg) != 0);
result = Curl_base64_encode((const char *) Curl_bufref_ptr(&ntlmmsg),
Curl_bufref_len(&ntlmmsg), &base64, &len);
if(!result) {
free(*allocuserpwd);
*allocuserpwd = aprintf("%sAuthorization: NTLM %s\r\n",
proxy ? "Proxy-" : "",
base64);
free(base64);
if(!*allocuserpwd)
result = CURLE_OUT_OF_MEMORY;
}
}
break;
case NTLMSTATE_TYPE2:
/* We already received the type-2 message, create a type-3 message */
result = Curl_auth_create_ntlm_type3_message(data, userp, passwdp,
ntlm, &ntlmmsg);
if(!result && Curl_bufref_len(&ntlmmsg)) {
result = Curl_base64_encode((const char *) Curl_bufref_ptr(&ntlmmsg),
Curl_bufref_len(&ntlmmsg), &base64, &len);
if(!result) {
free(*allocuserpwd);
*allocuserpwd = aprintf("%sAuthorization: NTLM %s\r\n",
proxy ? "Proxy-" : "",
base64);
free(base64);
if(!*allocuserpwd)
result = CURLE_OUT_OF_MEMORY;
else {
*state = NTLMSTATE_TYPE3; /* we send a type-3 */
authp->done = TRUE;
}
}
}
break;
case NTLMSTATE_LAST:
Curl_safefree(*allocuserpwd);
authp->done = TRUE;
break;
}
Curl_bufref_free(&ntlmmsg);
return result;
}
void Curl_http_auth_cleanup_ntlm(struct connectdata *conn)
{
Curl_auth_cleanup_ntlm(&conn->ntlm);
Curl_auth_cleanup_ntlm(&conn->proxyntlm);
}
#endif /* !CURL_DISABLE_HTTP && USE_NTLM */
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