mirror of
https://github.com/moparisthebest/curl
synced 2024-11-10 19:45:04 -05:00
cd6ecf6a89
Given the SSPI package info query indicates a token size of 4096 bytes, updated to use a dynamic buffer for the response message generation rather than a fixed buffer of 1024 bytes.
271 lines
8.1 KiB
C
271 lines
8.1 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) 2014, 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 http://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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* RFC2831 DIGEST-MD5 authentication
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* RFC4422 Simple Authentication and Security Layer (SASL)
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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)
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#include <curl/curl.h>
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#include "curl_sasl.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_memory.h"
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#include "curl_multibyte.h"
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#define _MPRINTF_REPLACE /* use our functions only */
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#include <curl/mprintf.h>
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/* The last #include file should be: */
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#include "memdebug.h"
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/*
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* Curl_sasl_build_spn()
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*
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* This is used to build a SPN string in the format service/host.
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*
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* Parameters:
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*
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* serivce [in] - The service type such as www, smtp, pop or imap.
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* instance [in] - The instance name such as the host nme or realm.
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*
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* Returns a pointer to the newly allocated SPN.
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*/
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TCHAR *Curl_sasl_build_spn(const char *service, const char *host)
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{
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char *utf8_spn = NULL;
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TCHAR *tchar_spn = NULL;
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/* Note: We could use DsMakeSPN() or DsClientMakeSpnForTargetServer() rather
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than doing this ourselves but the first is only available in Windows XP
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and Windows Server 2003 and the latter is only available in Windows 2000
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but not Windows95/98/ME or Windows NT4.0 unless the Active Directory
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Client Extensions are installed. As such it is far simpler for us to
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formulate the SPN instead. */
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/* Allocate our UTF8 based SPN */
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utf8_spn = aprintf("%s/%s", service, host);
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if(!utf8_spn) {
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return NULL;
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}
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/* Allocate our TCHAR based SPN */
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tchar_spn = Curl_convert_UTF8_to_tchar(utf8_spn);
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if(!tchar_spn) {
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Curl_safefree(utf8_spn);
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return NULL;
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}
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/* Release the UTF8 variant when operating with Unicode */
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if(utf8_spn != tchar_spn)
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Curl_safefree(utf8_spn);
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/* Return our newly allocated SPN */
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return tchar_spn;
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}
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#if !defined(CURL_DISABLE_CRYPTO_AUTH)
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/*
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* Curl_sasl_create_digest_md5_message()
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*
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* This is used to generate an already encoded DIGEST-MD5 response message
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* 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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* chlg64 [in] - Pointer to the base64 encoded challenge message.
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* userp [in] - The user name.
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* passdwp [in] - The user's password.
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* service [in] - The service type such as www, smtp, pop or imap.
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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_sasl_create_digest_md5_message(struct SessionHandle *data,
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const char *chlg64,
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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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char **outptr, size_t *outlen)
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{
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CURLcode result = CURLE_OK;
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TCHAR *spn = NULL;
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size_t chlglen = 0;
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size_t resp_max = 0;
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unsigned char *chlg = NULL;
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unsigned char *resp = NULL;
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CredHandle handle;
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CtxtHandle ctx;
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PSecPkgInfo SecurityPackage;
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SEC_WINNT_AUTH_IDENTITY identity;
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SecBuffer chlg_buf;
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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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SECURITY_STATUS status;
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unsigned long attrs;
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TimeStamp tsDummy; /* For Windows 9x compatibility of SSPI calls */
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/* Decode the base-64 encoded challenge message */
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if(strlen(chlg64) && *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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return CURLE_BAD_CONTENT_ENCODING;
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/* Ensure we have some login credientials as DigestSSP cannot use the current
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Windows user like NTLMSSP can */
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if(!userp || !*userp) {
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Curl_safefree(chlg);
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return CURLE_LOGIN_DENIED;
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}
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/* Query the security package for DigestSSP */
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status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *) TEXT("WDigest"),
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&SecurityPackage);
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if(status != SEC_E_OK) {
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Curl_safefree(chlg);
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return CURLE_NOT_BUILT_IN;
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}
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resp_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 response buffer */
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resp = malloc(resp_max);
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if(!resp) {
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Curl_safefree(chlg);
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return CURLE_OUT_OF_MEMORY;
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}
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/* Generate our SPN */
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spn = Curl_sasl_build_spn(service, data->easy_conn->host.name);
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if(!spn) {
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Curl_safefree(resp);
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Curl_safefree(chlg);
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return CURLE_OUT_OF_MEMORY;
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}
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/* Populate our identity structure */
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result = Curl_create_sspi_identity(userp, passwdp, &identity);
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if(result) {
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Curl_safefree(spn);
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Curl_safefree(resp);
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Curl_safefree(chlg);
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return result;
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}
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/* Acquire our credientials handle */
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status = s_pSecFn->AcquireCredentialsHandle(NULL,
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(TCHAR *) TEXT("WDigest"),
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SECPKG_CRED_OUTBOUND, NULL,
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&identity, NULL, NULL,
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&handle, &tsDummy);
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if(status != SEC_E_OK) {
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Curl_sspi_free_identity(&identity);
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Curl_safefree(spn);
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Curl_safefree(resp);
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Curl_safefree(chlg);
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return CURLE_OUT_OF_MEMORY;
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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;
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chlg_buf.BufferType = SECBUFFER_TOKEN;
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chlg_buf.pvBuffer = chlg;
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chlg_buf.cbBuffer = curlx_uztoul(chlglen);
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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 = resp;
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resp_buf.cbBuffer = curlx_uztoul(resp_max);
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/* Generate our challenge-response message */
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status = s_pSecFn->InitializeSecurityContext(&handle, NULL, spn, 0, 0, 0,
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&chlg_desc, 0, &ctx,
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&resp_desc, &attrs, &tsDummy);
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if(status == SEC_I_COMPLETE_AND_CONTINUE ||
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status == SEC_I_CONTINUE_NEEDED)
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s_pSecFn->CompleteAuthToken(&handle, &resp_desc);
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else if(status != SEC_E_OK) {
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s_pSecFn->FreeCredentialsHandle(&handle);
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Curl_sspi_free_identity(&identity);
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Curl_safefree(spn);
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Curl_safefree(resp);
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Curl_safefree(chlg);
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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 *)resp, resp_buf.cbBuffer, outptr,
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outlen);
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/* Free our handles */
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s_pSecFn->DeleteSecurityContext(&ctx);
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s_pSecFn->FreeCredentialsHandle(&handle);
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/* Free the identity structure */
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Curl_sspi_free_identity(&identity);
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/* Free the SPN */
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Curl_safefree(spn);
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/* Free the response buffer */
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Curl_safefree(resp);
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/* Free the decoeded challenge message */
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Curl_safefree(chlg);
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return result;
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}
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#endif /* !CURL_DISABLE_CRYPTO_AUTH */
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#endif /* USE_WINDOWS_SSPI */
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