354 lines
11 KiB
C
354 lines
11 KiB
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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* RFC4178 Simple and Protected GSS-API Negotiation Mechanism
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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_SPNEGO)
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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 "warnless.h"
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#include "curl_multibyte.h"
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#include "sendf.h"
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#include "strerror.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_spnego_supported()
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*
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* This is used to evaluate if SPNEGO (Negotiate) is supported.
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*
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* Parameters: None
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*
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* Returns TRUE if Negotiate is supported by Windows SSPI.
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*/
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bool Curl_auth_is_spnego_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 Negotiate */
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status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *)
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TEXT(SP_NAME_NEGOTIATE),
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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_decode_spnego_message()
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*
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* This is used to decode an already encoded SPNEGO (Negotiate) challenge
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* 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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* user [in] - The user name in the format User or Domain\User.
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* password [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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* chlg64 [in] - The optional base64 encoded challenge message.
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* nego [in/out] - The Negotiate 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_spnego_message(struct Curl_easy *data,
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const char *user,
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const char *password,
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const char *service,
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const char *host,
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const char *chlg64,
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struct negotiatedata *nego)
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{
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CURLcode result = CURLE_OK;
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size_t chlglen = 0;
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unsigned char *chlg = NULL;
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PSecPkgInfo SecurityPackage;
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SecBuffer chlg_buf[2];
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SecBuffer resp_buf;
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SecBufferDesc chlg_desc;
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SecBufferDesc resp_desc;
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unsigned long attrs;
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TimeStamp expiry; /* For Windows 9x compatibility of SSPI calls */
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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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if(nego->context && nego->status == SEC_E_OK) {
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/* We finished successfully our part of authentication, but server
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* rejected it (since we're again here). Exit with an error since we
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* can't invent anything better */
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Curl_auth_spnego_cleanup(nego);
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return CURLE_LOGIN_DENIED;
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}
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if(!nego->spn) {
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/* Generate our SPN */
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nego->spn = Curl_auth_build_spn(service, host, NULL);
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if(!nego->spn)
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return CURLE_OUT_OF_MEMORY;
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}
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if(!nego->output_token) {
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/* Query the security package for Negotiate */
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nego->status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *)
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TEXT(SP_NAME_NEGOTIATE),
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&SecurityPackage);
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if(nego->status != SEC_E_OK)
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return CURLE_NOT_BUILT_IN;
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nego->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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nego->output_token = malloc(nego->token_max);
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if(!nego->output_token)
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return CURLE_OUT_OF_MEMORY;
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}
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if(!nego->credentials) {
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/* Do we have credentials to use or are we using single sign-on? */
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if(user && *user) {
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/* Populate our identity structure */
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result = Curl_create_sspi_identity(user, password, &nego->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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nego->p_identity = &nego->identity;
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}
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else
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/* Use the current Windows user */
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nego->p_identity = NULL;
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/* Allocate our credentials handle */
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nego->credentials = calloc(1, sizeof(CredHandle));
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if(!nego->credentials)
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return CURLE_OUT_OF_MEMORY;
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/* Acquire our credentials handle */
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nego->status =
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s_pSecFn->AcquireCredentialsHandle(NULL,
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(TCHAR *)TEXT(SP_NAME_NEGOTIATE),
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SECPKG_CRED_OUTBOUND, NULL,
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nego->p_identity, NULL, NULL,
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nego->credentials, &expiry);
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if(nego->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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nego->context = calloc(1, sizeof(CtxtHandle));
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if(!nego->context)
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return CURLE_OUT_OF_MEMORY;
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}
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if(chlg64 && *chlg64) {
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/* Decode the base-64 encoded challenge message */
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if(*chlg64 != '=') {
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result = Curl_base64_decode(chlg64, &chlg, &chlglen);
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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 challenge message */
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if(!chlg) {
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infof(data, "SPNEGO handshake failure (empty challenge message)\n");
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return CURLE_BAD_CONTENT_ENCODING;
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}
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/* Setup the challenge "input" security buffer */
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chlg_desc.ulVersion = SECBUFFER_VERSION;
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chlg_desc.cBuffers = 1;
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chlg_desc.pBuffers = &chlg_buf[0];
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chlg_buf[0].BufferType = SECBUFFER_TOKEN;
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chlg_buf[0].pvBuffer = chlg;
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chlg_buf[0].cbBuffer = curlx_uztoul(chlglen);
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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(nego->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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nego->status = s_pSecFn->QueryContextAttributes(
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nego->sslContext,
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SECPKG_ATTR_ENDPOINT_BINDINGS,
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&pkgBindings
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);
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if(nego->status == SEC_E_OK) {
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chlg_desc.cBuffers++;
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chlg_buf[1].BufferType = SECBUFFER_CHANNEL_BINDINGS;
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chlg_buf[1].cbBuffer = pkgBindings.BindingsLength;
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chlg_buf[1].pvBuffer = pkgBindings.Bindings;
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}
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}
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#endif
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}
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/* Setup the response "output" security buffer */
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resp_desc.ulVersion = SECBUFFER_VERSION;
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resp_desc.cBuffers = 1;
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resp_desc.pBuffers = &resp_buf;
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resp_buf.BufferType = SECBUFFER_TOKEN;
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resp_buf.pvBuffer = nego->output_token;
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resp_buf.cbBuffer = curlx_uztoul(nego->token_max);
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/* Generate our challenge-response message */
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nego->status = s_pSecFn->InitializeSecurityContext(nego->credentials,
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chlg ? nego->context :
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NULL,
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nego->spn,
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ISC_REQ_CONFIDENTIALITY,
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0, SECURITY_NATIVE_DREP,
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chlg ? &chlg_desc : NULL,
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0, nego->context,
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&resp_desc, &attrs,
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&expiry);
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/* Free the decoded challenge as it is not required anymore */
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free(chlg);
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if(GSS_ERROR(nego->status)) {
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char buffer[STRERROR_LEN];
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failf(data, "InitializeSecurityContext failed: %s",
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Curl_sspi_strerror(nego->status, buffer, sizeof(buffer)));
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return CURLE_OUT_OF_MEMORY;
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}
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if(nego->status == SEC_I_COMPLETE_NEEDED ||
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nego->status == SEC_I_COMPLETE_AND_CONTINUE) {
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nego->status = s_pSecFn->CompleteAuthToken(nego->context, &resp_desc);
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if(GSS_ERROR(nego->status)) {
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return CURLE_RECV_ERROR;
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}
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}
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nego->output_token_length = resp_buf.cbBuffer;
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return result;
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}
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/*
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* Curl_auth_create_spnego_message()
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*
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* This is used to generate an already encoded SPNEGO (Negotiate) response
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* message ready for 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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* nego [in/out] - The Negotiate 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_spnego_message(struct Curl_easy *data,
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struct negotiatedata *nego,
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char **outptr, size_t *outlen)
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{
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CURLcode result;
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/* Base64 encode the already generated response */
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result = Curl_base64_encode(data,
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(const char *) nego->output_token,
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nego->output_token_length,
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outptr, outlen);
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if(result)
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return result;
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if(!*outptr || !*outlen) {
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free(*outptr);
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return CURLE_REMOTE_ACCESS_DENIED;
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}
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return CURLE_OK;
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}
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/*
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* Curl_auth_spnego_cleanup()
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*
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* This is used to clean up the SPNEGO (Negotiate) specific data.
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*
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* Parameters:
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*
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* nego [in/out] - The Negotiate data struct being cleaned up.
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*
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*/
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void Curl_auth_spnego_cleanup(struct negotiatedata *nego)
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{
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/* Free our security context */
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if(nego->context) {
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s_pSecFn->DeleteSecurityContext(nego->context);
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free(nego->context);
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nego->context = NULL;
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}
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/* Free our credentials handle */
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if(nego->credentials) {
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s_pSecFn->FreeCredentialsHandle(nego->credentials);
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free(nego->credentials);
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nego->credentials = NULL;
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}
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/* Free our identity */
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Curl_sspi_free_identity(nego->p_identity);
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nego->p_identity = NULL;
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/* Free the SPN and output token */
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Curl_safefree(nego->spn);
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Curl_safefree(nego->output_token);
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/* Reset any variables */
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nego->status = 0;
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nego->token_max = 0;
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nego->state = GSS_AUTHNONE;
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nego->noauthpersist = FALSE;
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nego->havenoauthpersist = FALSE;
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nego->havenegdata = FALSE;
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nego->havemultiplerequests = FALSE;
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}
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#endif /* USE_WINDOWS_SSPI && USE_SPNEGO */
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