276 lines
7.9 KiB
C
276 lines
7.9 KiB
C
/***************************************************************************
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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) 1998 - 2021, 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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***************************************************************************/
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#include "curl_setup.h"
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#if !defined(CURL_DISABLE_HTTP) && defined(USE_NTLM)
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/*
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* NTLM details:
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*
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* https://davenport.sourceforge.io/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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#include "urldata.h"
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#include "sendf.h"
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#include "strcase.h"
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#include "http_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 "curl_base64.h"
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#include "vauth/vauth.h"
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#include "url.h"
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/* SSL backend-specific #if branches in this file must be kept in the order
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documented in curl_ntlm_core. */
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#if defined(USE_WINDOWS_SSPI)
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#include "curl_sspi.h"
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#endif
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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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CURLcode Curl_input_ntlm(struct Curl_easy *data,
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bool proxy, /* if proxy or not */
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const char *header) /* rest of the www-authenticate:
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header */
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{
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/* point to the correct struct with this */
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struct ntlmdata *ntlm;
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curlntlm *state;
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CURLcode result = CURLE_OK;
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struct connectdata *conn = data->conn;
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ntlm = proxy ? &conn->proxyntlm : &conn->ntlm;
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state = proxy ? &conn->proxy_ntlm_state : &conn->http_ntlm_state;
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if(checkprefix("NTLM", header)) {
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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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unsigned char *hdr;
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size_t hdrlen;
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result = Curl_base64_decode(header, &hdr, &hdrlen);
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if(!result) {
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struct bufref hdrbuf;
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Curl_bufref_init(&hdrbuf);
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Curl_bufref_set(&hdrbuf, hdr, hdrlen, curl_free);
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result = Curl_auth_decode_ntlm_type2_message(data, &hdrbuf, ntlm);
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Curl_bufref_free(&hdrbuf);
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}
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if(result)
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return result;
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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(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(conn);
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*state = NTLMSTATE_NONE;
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return CURLE_REMOTE_ACCESS_DENIED;
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}
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else if(*state >= NTLMSTATE_TYPE1) {
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infof(data, "NTLM handshake failure (internal error)");
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return CURLE_REMOTE_ACCESS_DENIED;
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}
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*state = NTLMSTATE_TYPE1; /* We should send away a type-1 */
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}
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}
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return result;
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}
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/*
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* This is for creating ntlm header output
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*/
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CURLcode Curl_output_ntlm(struct Curl_easy *data, bool proxy)
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{
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char *base64 = NULL;
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size_t len = 0;
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CURLcode result = CURLE_OK;
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struct bufref ntlmmsg;
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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 username, password, service and host */
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const char *userp;
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const char *passwdp;
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const char *service = NULL;
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const char *hostname = NULL;
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/* point to the correct struct with this */
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struct ntlmdata *ntlm;
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curlntlm *state;
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struct auth *authp;
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struct connectdata *conn = data->conn;
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DEBUGASSERT(conn);
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DEBUGASSERT(data);
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if(proxy) {
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#ifndef CURL_DISABLE_PROXY
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allocuserpwd = &data->state.aptr.proxyuserpwd;
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userp = data->state.aptr.proxyuser;
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passwdp = data->state.aptr.proxypasswd;
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service = data->set.str[STRING_PROXY_SERVICE_NAME] ?
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data->set.str[STRING_PROXY_SERVICE_NAME] : "HTTP";
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hostname = conn->http_proxy.host.name;
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ntlm = &conn->proxyntlm;
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state = &conn->proxy_ntlm_state;
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authp = &data->state.authproxy;
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#else
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return CURLE_NOT_BUILT_IN;
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#endif
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}
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else {
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allocuserpwd = &data->state.aptr.userpwd;
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userp = data->state.aptr.user;
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passwdp = data->state.aptr.passwd;
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service = data->set.str[STRING_SERVICE_NAME] ?
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data->set.str[STRING_SERVICE_NAME] : "HTTP";
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hostname = conn->host.name;
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ntlm = &conn->ntlm;
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state = &conn->http_ntlm_state;
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authp = &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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if(!passwdp)
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passwdp = "";
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#ifdef USE_WINDOWS_SSPI
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if(!s_hSecDll) {
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/* not thread safe and leaks - use curl_global_init() to avoid */
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CURLcode err = Curl_sspi_global_init();
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if(!s_hSecDll)
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return err;
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}
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#ifdef SECPKG_ATTR_ENDPOINT_BINDINGS
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ntlm->sslContext = conn->sslContext;
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#endif
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#endif
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Curl_bufref_init(&ntlmmsg);
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/* connection is already authenticated, don't send a header in future
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* requests so go directly to NTLMSTATE_LAST */
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if(*state == NTLMSTATE_TYPE3)
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*state = NTLMSTATE_LAST;
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switch(*state) {
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case NTLMSTATE_TYPE1:
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default: /* for the weird cases we (re)start here */
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/* Create a type-1 message */
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result = Curl_auth_create_ntlm_type1_message(data, userp, passwdp,
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service, hostname,
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ntlm, &ntlmmsg);
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if(!result) {
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DEBUGASSERT(Curl_bufref_len(&ntlmmsg) != 0);
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result = Curl_base64_encode(data,
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(const char *) Curl_bufref_ptr(&ntlmmsg),
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Curl_bufref_len(&ntlmmsg), &base64, &len);
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if(!result) {
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free(*allocuserpwd);
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*allocuserpwd = aprintf("%sAuthorization: NTLM %s\r\n",
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proxy ? "Proxy-" : "",
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base64);
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free(base64);
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if(!*allocuserpwd)
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result = CURLE_OUT_OF_MEMORY;
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}
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}
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break;
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case NTLMSTATE_TYPE2:
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/* We already received the type-2 message, create a type-3 message */
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result = Curl_auth_create_ntlm_type3_message(data, userp, passwdp,
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ntlm, &ntlmmsg);
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if(!result && Curl_bufref_len(&ntlmmsg)) {
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result = Curl_base64_encode(data,
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(const char *) Curl_bufref_ptr(&ntlmmsg),
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Curl_bufref_len(&ntlmmsg), &base64, &len);
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if(!result) {
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free(*allocuserpwd);
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*allocuserpwd = aprintf("%sAuthorization: NTLM %s\r\n",
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proxy ? "Proxy-" : "",
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base64);
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free(base64);
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if(!*allocuserpwd)
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result = CURLE_OUT_OF_MEMORY;
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else {
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*state = NTLMSTATE_TYPE3; /* we send a type-3 */
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authp->done = TRUE;
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}
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}
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}
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break;
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case NTLMSTATE_LAST:
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Curl_safefree(*allocuserpwd);
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authp->done = TRUE;
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break;
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}
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Curl_bufref_free(&ntlmmsg);
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return result;
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}
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void Curl_http_auth_cleanup_ntlm(struct connectdata *conn)
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{
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Curl_auth_cleanup_ntlm(&conn->ntlm);
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Curl_auth_cleanup_ntlm(&conn->proxyntlm);
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#if defined(NTLM_WB_ENABLED)
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Curl_http_auth_cleanup_ntlm_wb(conn);
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#endif
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}
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#endif /* !CURL_DISABLE_HTTP && USE_NTLM */
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