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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2014, 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 http://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.
*
* RFC2831 DIGEST-MD5 authentication
* RFC4422 Simple Authentication and Security Layer (SASL)
*
***************************************************************************/
#include "curl_setup.h"
#if defined(USE_WINDOWS_SSPI) && !defined(CURL_DISABLE_CRYPTO_AUTH)
#include <curl/curl.h>
#include "curl_sasl.h"
#include "urldata.h"
#include "curl_base64.h"
#include "warnless.h"
#include "curl_memory.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
/* The last #include file should be: */
#include "memdebug.h"
/*
* Curl_sasl_create_digest_md5_message()
*
* This is used to generate an already encoded DIGEST-MD5 response message
* ready for sending to the recipient.
*
* Parameters:
*
* data [in] - The session handle.
* chlg64 [in] - Pointer to the base64 encoded challenge message.
* userp [in] - The user name.
* passdwp [in] - The user's password.
* service [in] - The service type such as www, smtp, pop or imap.
* 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_sasl_create_digest_md5_message(struct SessionHandle *data,
const char *chlg64,
const char *userp,
const char *passwdp,
const char *service,
char **outptr, size_t *outlen)
{
CURLcode result = CURLE_OK;
char *spn = NULL;
size_t chlglen = 0;
unsigned char *chlg = NULL;
unsigned char resp[1024];
CredHandle handle;
CtxtHandle ctx;
PSecPkgInfo SecurityPackage;
SEC_WINNT_AUTH_IDENTITY identity;
SecBuffer chlg_buf;
SecBuffer resp_buf;
SecBufferDesc chlg_desc;
SecBufferDesc resp_desc;
SECURITY_STATUS status;
unsigned long attrs;
TimeStamp tsDummy; /* For Windows 9x compatibility of SSPI calls */
/* Decode the base-64 encoded challenge message */
if(strlen(chlg64) && *chlg64 != '=') {
result = Curl_base64_decode(chlg64, &chlg, &chlglen);
if(result)
return result;
}
/* Ensure we have a valid challenge message */
if(!chlg)
return CURLE_BAD_CONTENT_ENCODING;
/* Ensure we have some login credientials as DigestSSP cannot use the current
Windows user like NTLMSSP can */
if(!userp || !*userp) {
Curl_safefree(chlg);
return CURLE_LOGIN_DENIED;
}
/* Query the security package for DigestSSP */
status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *) TEXT("WDigest"),
&SecurityPackage);
if(status != SEC_E_OK) {
Curl_safefree(chlg);
return CURLE_NOT_BUILT_IN;
}
/* Calculate our SPN */
spn = aprintf("%s/%s", service, data->easy_conn->host.name);
if(!spn)
return CURLE_OUT_OF_MEMORY;
/* Populate our identity structure */
result = Curl_create_sspi_identity(userp, passwdp, &identity);
if(result) {
Curl_safefree(spn);
Curl_safefree(chlg);
return result;
}
/* Acquire our credientials handle */
status = s_pSecFn->AcquireCredentialsHandle(NULL,
(TCHAR *) TEXT("WDigest"),
SECPKG_CRED_OUTBOUND, NULL,
&identity, NULL, NULL,
&handle, &tsDummy);
if(status != SEC_E_OK) {
Curl_sspi_free_identity(&identity);
Curl_safefree(spn);
Curl_safefree(chlg);
return CURLE_OUT_OF_MEMORY;
}
/* Setup the challenge "input" security buffer */
chlg_desc.ulVersion = SECBUFFER_VERSION;
chlg_desc.cBuffers = 1;
chlg_desc.pBuffers = &chlg_buf;
chlg_buf.BufferType = SECBUFFER_TOKEN;
chlg_buf.pvBuffer = chlg;
chlg_buf.cbBuffer = curlx_uztoul(chlglen);
/* Setup the response "output" security buffer */
resp_desc.ulVersion = SECBUFFER_VERSION;
resp_desc.cBuffers = 1;
resp_desc.pBuffers = &resp_buf;
resp_buf.BufferType = SECBUFFER_TOKEN;
resp_buf.pvBuffer = resp;
resp_buf.cbBuffer = sizeof(resp);
/* Generate our challenge-response message */
status = s_pSecFn->InitializeSecurityContext(&handle,
NULL,
(TCHAR *) spn,
0, 0, 0,
&chlg_desc,
0, &ctx,
&resp_desc,
&attrs, &tsDummy);
if(status == SEC_I_COMPLETE_AND_CONTINUE ||
status == SEC_I_CONTINUE_NEEDED)
s_pSecFn->CompleteAuthToken(&handle, &resp_desc);
else if(status != SEC_E_OK) {
s_pSecFn->FreeCredentialsHandle(&handle);
Curl_sspi_free_identity(&identity);
Curl_safefree(spn);
Curl_safefree(chlg);
return CURLE_RECV_ERROR;
}
/* Base64 encode the response */
result = Curl_base64_encode(data, (char *)resp, resp_buf.cbBuffer, outptr,
outlen);
/* Free our handles */
s_pSecFn->DeleteSecurityContext(&ctx);
s_pSecFn->FreeCredentialsHandle(&handle);
/* Free the identity structure */
Curl_sspi_free_identity(&identity);
/* Free the SPN */
Curl_safefree(spn);
/* Free the decoeded challenge message */
Curl_safefree(chlg);
return result;
}
#endif /* USE_WINDOWS_SSPI && !CURL_DISABLE_CRYPTO_AUTH */
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