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Floris Bos
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371
dependencies/cmcurl/lib/vauth/ntlm_sspi.c
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371
dependencies/cmcurl/lib/vauth/ntlm_sspi.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) 1998 - 2019, 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.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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#include "curl_setup.h"
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#if defined(USE_WINDOWS_SSPI) && defined(USE_NTLM)
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#include <curl/curl.h>
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#include "vauth/vauth.h"
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#include "urldata.h"
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#include "curl_base64.h"
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#include "curl_ntlm_core.h"
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#include "warnless.h"
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#include "curl_multibyte.h"
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#include "sendf.h"
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/* The last #include files should be: */
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#include "curl_memory.h"
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#include "memdebug.h"
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/*
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* Curl_auth_is_ntlm_supported()
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*
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* This is used to evaluate if NTLM is supported.
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*
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* Parameters: None
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*
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* Returns TRUE if NTLM is supported by Windows SSPI.
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*/
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bool Curl_auth_is_ntlm_supported(void)
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{
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PSecPkgInfo SecurityPackage;
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SECURITY_STATUS status;
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/* Query the security package for NTLM */
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status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *) TEXT(SP_NAME_NTLM),
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&SecurityPackage);
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return (status == SEC_E_OK ? TRUE : FALSE);
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}
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/*
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* Curl_auth_create_ntlm_type1_message()
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*
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* This is used to generate an already encoded NTLM type-1 message ready for
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* sending to the recipient.
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*
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* Parameters:
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*
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* data [in] - The session handle.
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* userp [in] - The user name in the format User or Domain\User.
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* passwdp [in] - The user's password.
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* service [in] - The service type such as http, smtp, pop or imap.
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* host [in] - The host name.
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* ntlm [in/out] - The NTLM data struct being used and modified.
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* outptr [in/out] - The address where a pointer to newly allocated memory
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* holding the result will be stored upon completion.
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* outlen [out] - The length of the output message.
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*
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* Returns CURLE_OK on success.
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*/
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CURLcode Curl_auth_create_ntlm_type1_message(struct Curl_easy *data,
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const char *userp,
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const char *passwdp,
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const char *service,
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const char *host,
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struct ntlmdata *ntlm,
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char **outptr, size_t *outlen)
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{
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PSecPkgInfo SecurityPackage;
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SecBuffer type_1_buf;
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SecBufferDesc type_1_desc;
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SECURITY_STATUS status;
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unsigned long attrs;
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TimeStamp expiry; /* For Windows 9x compatibility of SSPI calls */
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/* Clean up any former leftovers and initialise to defaults */
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Curl_auth_cleanup_ntlm(ntlm);
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/* Query the security package for NTLM */
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status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *) TEXT(SP_NAME_NTLM),
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&SecurityPackage);
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if(status != SEC_E_OK)
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return CURLE_NOT_BUILT_IN;
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ntlm->token_max = SecurityPackage->cbMaxToken;
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/* Release the package buffer as it is not required anymore */
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s_pSecFn->FreeContextBuffer(SecurityPackage);
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/* Allocate our output buffer */
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ntlm->output_token = malloc(ntlm->token_max);
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if(!ntlm->output_token)
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return CURLE_OUT_OF_MEMORY;
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if(userp && *userp) {
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CURLcode result;
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/* Populate our identity structure */
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result = Curl_create_sspi_identity(userp, passwdp, &ntlm->identity);
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if(result)
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return result;
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/* Allow proper cleanup of the identity structure */
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ntlm->p_identity = &ntlm->identity;
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}
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else
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/* Use the current Windows user */
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ntlm->p_identity = NULL;
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/* Allocate our credentials handle */
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ntlm->credentials = calloc(1, sizeof(CredHandle));
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if(!ntlm->credentials)
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return CURLE_OUT_OF_MEMORY;
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/* Acquire our credentials handle */
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status = s_pSecFn->AcquireCredentialsHandle(NULL,
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(TCHAR *) TEXT(SP_NAME_NTLM),
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SECPKG_CRED_OUTBOUND, NULL,
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ntlm->p_identity, NULL, NULL,
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ntlm->credentials, &expiry);
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if(status != SEC_E_OK)
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return CURLE_LOGIN_DENIED;
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/* Allocate our new context handle */
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ntlm->context = calloc(1, sizeof(CtxtHandle));
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if(!ntlm->context)
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return CURLE_OUT_OF_MEMORY;
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ntlm->spn = Curl_auth_build_spn(service, host, NULL);
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if(!ntlm->spn)
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return CURLE_OUT_OF_MEMORY;
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/* Setup the type-1 "output" security buffer */
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type_1_desc.ulVersion = SECBUFFER_VERSION;
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type_1_desc.cBuffers = 1;
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type_1_desc.pBuffers = &type_1_buf;
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type_1_buf.BufferType = SECBUFFER_TOKEN;
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type_1_buf.pvBuffer = ntlm->output_token;
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type_1_buf.cbBuffer = curlx_uztoul(ntlm->token_max);
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/* Generate our type-1 message */
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status = s_pSecFn->InitializeSecurityContext(ntlm->credentials, NULL,
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ntlm->spn,
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0, 0, SECURITY_NETWORK_DREP,
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NULL, 0,
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ntlm->context, &type_1_desc,
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&attrs, &expiry);
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if(status == SEC_I_COMPLETE_NEEDED ||
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status == SEC_I_COMPLETE_AND_CONTINUE)
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s_pSecFn->CompleteAuthToken(ntlm->context, &type_1_desc);
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else if(status != SEC_E_OK && status != SEC_I_CONTINUE_NEEDED)
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return CURLE_RECV_ERROR;
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/* Base64 encode the response */
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return Curl_base64_encode(data, (char *) ntlm->output_token,
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type_1_buf.cbBuffer, outptr, outlen);
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}
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/*
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* Curl_auth_decode_ntlm_type2_message()
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*
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* This is used to decode an already encoded NTLM type-2 message.
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*
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* Parameters:
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*
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* data [in] - The session handle.
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* type2msg [in] - The base64 encoded type-2 message.
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* ntlm [in/out] - The NTLM data struct being used and modified.
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*
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* Returns CURLE_OK on success.
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*/
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CURLcode Curl_auth_decode_ntlm_type2_message(struct Curl_easy *data,
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const char *type2msg,
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struct ntlmdata *ntlm)
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{
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CURLcode result = CURLE_OK;
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unsigned char *type2 = NULL;
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size_t type2_len = 0;
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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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/* Decode the base-64 encoded type-2 message */
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if(strlen(type2msg) && *type2msg != '=') {
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result = Curl_base64_decode(type2msg, &type2, &type2_len);
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if(result)
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return result;
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}
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/* Ensure we have a valid type-2 message */
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if(!type2) {
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infof(data, "NTLM handshake failure (empty type-2 message)\n");
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return CURLE_BAD_CONTENT_ENCODING;
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}
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/* Simply store the challenge for use later */
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ntlm->input_token = type2;
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ntlm->input_token_len = type2_len;
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return result;
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}
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/*
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* Curl_auth_create_ntlm_type3_message()
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* Curl_auth_create_ntlm_type3_message()
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*
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* This is used to generate an already encoded NTLM type-3 message ready for
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* sending to the recipient.
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*
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* Parameters:
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*
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* data [in] - The session handle.
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* userp [in] - The user name in the format User or Domain\User.
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* passwdp [in] - The user's password.
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* ntlm [in/out] - The NTLM data struct being used and modified.
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* outptr [in/out] - The address where a pointer to newly allocated memory
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* holding the result will be stored upon completion.
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* outlen [out] - The length of the output message.
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*
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* Returns CURLE_OK on success.
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*/
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CURLcode Curl_auth_create_ntlm_type3_message(struct Curl_easy *data,
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const char *userp,
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const char *passwdp,
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struct ntlmdata *ntlm,
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char **outptr, size_t *outlen)
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{
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CURLcode result = CURLE_OK;
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SecBuffer type_2_bufs[2];
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SecBuffer type_3_buf;
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SecBufferDesc type_2_desc;
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SecBufferDesc type_3_desc;
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SECURITY_STATUS status;
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unsigned long attrs;
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TimeStamp expiry; /* For Windows 9x compatibility of SSPI calls */
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(void) passwdp;
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(void) userp;
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/* Setup the type-2 "input" security buffer */
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type_2_desc.ulVersion = SECBUFFER_VERSION;
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type_2_desc.cBuffers = 1;
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type_2_desc.pBuffers = &type_2_bufs[0];
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type_2_bufs[0].BufferType = SECBUFFER_TOKEN;
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type_2_bufs[0].pvBuffer = ntlm->input_token;
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type_2_bufs[0].cbBuffer = curlx_uztoul(ntlm->input_token_len);
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#ifdef SECPKG_ATTR_ENDPOINT_BINDINGS
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/* ssl context comes from schannel.
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* When extended protection is used in IIS server,
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* we have to pass a second SecBuffer to the SecBufferDesc
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* otherwise IIS will not pass the authentication (401 response).
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* Minimum supported version is Windows 7.
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* https://docs.microsoft.com/en-us/security-updates
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* /SecurityAdvisories/2009/973811
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*/
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if(ntlm->sslContext) {
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SEC_CHANNEL_BINDINGS channelBindings;
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SecPkgContext_Bindings pkgBindings;
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pkgBindings.Bindings = &channelBindings;
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status = s_pSecFn->QueryContextAttributes(
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ntlm->sslContext,
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SECPKG_ATTR_ENDPOINT_BINDINGS,
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&pkgBindings
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);
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if(status == SEC_E_OK) {
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type_2_desc.cBuffers++;
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type_2_bufs[1].BufferType = SECBUFFER_CHANNEL_BINDINGS;
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type_2_bufs[1].cbBuffer = pkgBindings.BindingsLength;
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type_2_bufs[1].pvBuffer = pkgBindings.Bindings;
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}
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}
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#endif
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/* Setup the type-3 "output" security buffer */
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type_3_desc.ulVersion = SECBUFFER_VERSION;
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type_3_desc.cBuffers = 1;
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type_3_desc.pBuffers = &type_3_buf;
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type_3_buf.BufferType = SECBUFFER_TOKEN;
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type_3_buf.pvBuffer = ntlm->output_token;
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type_3_buf.cbBuffer = curlx_uztoul(ntlm->token_max);
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/* Generate our type-3 message */
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status = s_pSecFn->InitializeSecurityContext(ntlm->credentials,
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ntlm->context,
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ntlm->spn,
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0, 0, SECURITY_NETWORK_DREP,
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&type_2_desc,
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0, ntlm->context,
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&type_3_desc,
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&attrs, &expiry);
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if(status != SEC_E_OK) {
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infof(data, "NTLM handshake failure (type-3 message): Status=%x\n",
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status);
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return CURLE_RECV_ERROR;
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}
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/* Base64 encode the response */
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result = Curl_base64_encode(data, (char *) ntlm->output_token,
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type_3_buf.cbBuffer, outptr, outlen);
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Curl_auth_cleanup_ntlm(ntlm);
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return result;
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}
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/*
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* Curl_auth_cleanup_ntlm()
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*
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* This is used to clean up the NTLM specific data.
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*
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* Parameters:
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*
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* ntlm [in/out] - The NTLM data struct being cleaned up.
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*
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*/
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void Curl_auth_cleanup_ntlm(struct ntlmdata *ntlm)
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{
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/* Free our security context */
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if(ntlm->context) {
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s_pSecFn->DeleteSecurityContext(ntlm->context);
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free(ntlm->context);
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ntlm->context = NULL;
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}
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/* Free our credentials handle */
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if(ntlm->credentials) {
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s_pSecFn->FreeCredentialsHandle(ntlm->credentials);
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free(ntlm->credentials);
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ntlm->credentials = NULL;
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}
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/* Free our identity */
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Curl_sspi_free_identity(ntlm->p_identity);
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ntlm->p_identity = NULL;
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/* Free the input and output tokens */
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Curl_safefree(ntlm->input_token);
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Curl_safefree(ntlm->output_token);
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/* Reset any variables */
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ntlm->token_max = 0;
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Curl_safefree(ntlm->spn);
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}
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#endif /* USE_WINDOWS_SSPI && USE_NTLM */
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