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5808a0d0f5
curl/lib/vauth/ntlm_sspi.c
migueljcrum 67b30b3418
sspi: fix memory leaks 
Closes #4299
2019-09-10 08:06:05 +02:00

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