mirror of
https://github.com/moparisthebest/curl
synced 2024-11-17 23:15:08 -05:00
89b7898846
Curl_auth_decode_digest_http_message(): copy terminating NUL as later Curl_override_sspi_http_realm() expects a NUL-terminated string. Fixes #1180
555 lines
17 KiB
C
555 lines
17 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 - 2016, Steve Holme, <steve_holme@hotmail.com>.
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* Copyright (C) 2015, 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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* RFC2831 DIGEST-MD5 authentication
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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(CURL_DISABLE_CRYPTO_AUTH)
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#include <curl/curl.h>
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#include "vauth/vauth.h"
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#include "vauth/digest.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 "strdup.h"
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#include "strcase.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_digest_supported()
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*
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* This is used to evaluate if DIGEST is supported.
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*
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* Parameters: None
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*
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* Returns TRUE if DIGEST is supported by Windows SSPI.
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*/
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bool Curl_auth_is_digest_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 Digest */
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status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *) TEXT(SP_NAME_DIGEST),
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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_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] - The base64 encoded challenge message.
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* userp [in] - The user name in the format User or Domain\User.
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* passdwp [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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* 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_digest_md5_message(struct Curl_easy *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 token_max = 0;
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unsigned char *input_token = NULL;
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unsigned char *output_token = NULL;
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CredHandle credentials;
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CtxtHandle context;
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PSecPkgInfo SecurityPackage;
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SEC_WINNT_AUTH_IDENTITY identity;
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SEC_WINNT_AUTH_IDENTITY *p_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 expiry; /* 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, &input_token, &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(!input_token) {
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infof(data, "DIGEST-MD5 handshake failure (empty challenge message)\n");
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return CURLE_BAD_CONTENT_ENCODING;
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}
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/* Query the security package for DigestSSP */
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status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *) TEXT(SP_NAME_DIGEST),
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&SecurityPackage);
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if(status != SEC_E_OK) {
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free(input_token);
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return CURLE_NOT_BUILT_IN;
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}
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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 response buffer */
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output_token = malloc(token_max);
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if(!output_token) {
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free(input_token);
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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_auth_build_spn(service, data->easy_conn->host.name, NULL);
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if(!spn) {
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free(output_token);
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free(input_token);
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return CURLE_OUT_OF_MEMORY;
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}
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if(userp && *userp) {
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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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free(spn);
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free(output_token);
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free(input_token);
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return result;
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}
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/* Allow proper cleanup of the identity structure */
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p_identity = &identity;
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}
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else
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/* Use the current Windows user */
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p_identity = NULL;
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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_DIGEST),
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SECPKG_CRED_OUTBOUND, NULL,
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p_identity, NULL, NULL,
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&credentials, &expiry);
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if(status != SEC_E_OK) {
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Curl_sspi_free_identity(p_identity);
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free(spn);
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free(output_token);
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free(input_token);
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return CURLE_LOGIN_DENIED;
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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 = input_token;
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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 = output_token;
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resp_buf.cbBuffer = curlx_uztoul(token_max);
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/* Generate our response message */
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status = s_pSecFn->InitializeSecurityContext(&credentials, NULL, spn,
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0, 0, 0, &chlg_desc, 0,
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&context, &resp_desc, &attrs,
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&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(&credentials, &resp_desc);
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else if(status != SEC_E_OK && status != SEC_I_CONTINUE_NEEDED) {
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s_pSecFn->FreeCredentialsHandle(&credentials);
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Curl_sspi_free_identity(p_identity);
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free(spn);
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free(output_token);
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free(input_token);
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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 *) output_token, resp_buf.cbBuffer,
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outptr, outlen);
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/* Free our handles */
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s_pSecFn->DeleteSecurityContext(&context);
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s_pSecFn->FreeCredentialsHandle(&credentials);
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/* Free the identity structure */
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Curl_sspi_free_identity(p_identity);
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/* Free the SPN */
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free(spn);
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/* Free the response buffer */
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free(output_token);
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/* Free the decoded challenge message */
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free(input_token);
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return result;
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}
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/*
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* Curl_override_sspi_http_realm()
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*
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* This is used to populate the domain in a SSPI identity structure
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* The realm is extracted from the challenge message and used as the
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* domain if it is not already explicitly set.
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*
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* Parameters:
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*
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* chlg [in] - The challenge message.
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* identity [in/out] - The identity structure.
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*
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* Returns CURLE_OK on success.
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*/
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CURLcode Curl_override_sspi_http_realm(const char *chlg,
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SEC_WINNT_AUTH_IDENTITY *identity)
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{
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xcharp_u domain, dup_domain;
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/* If domain is blank or unset, check challenge message for realm */
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if(!identity->Domain || !identity->DomainLength) {
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for(;;) {
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char value[DIGEST_MAX_VALUE_LENGTH];
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char content[DIGEST_MAX_CONTENT_LENGTH];
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/* Pass all additional spaces here */
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while(*chlg && ISSPACE(*chlg))
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chlg++;
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/* Extract a value=content pair */
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if(Curl_auth_digest_get_pair(chlg, value, content, &chlg)) {
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if(strcasecompare(value, "realm")) {
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/* Setup identity's domain and length */
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domain.tchar_ptr = Curl_convert_UTF8_to_tchar((char *) content);
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if(!domain.tchar_ptr)
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return CURLE_OUT_OF_MEMORY;
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dup_domain.tchar_ptr = _tcsdup(domain.tchar_ptr);
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if(!dup_domain.tchar_ptr) {
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Curl_unicodefree(domain.tchar_ptr);
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return CURLE_OUT_OF_MEMORY;
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}
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free(identity->Domain);
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identity->Domain = dup_domain.tbyte_ptr;
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identity->DomainLength = curlx_uztoul(_tcslen(dup_domain.tchar_ptr));
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dup_domain.tchar_ptr = NULL;
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Curl_unicodefree(domain.tchar_ptr);
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}
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else {
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/* Unknown specifier, ignore it! */
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}
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}
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else
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break; /* We're done here */
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/* Pass all additional spaces here */
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while(*chlg && ISSPACE(*chlg))
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chlg++;
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/* Allow the list to be comma-separated */
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if(',' == *chlg)
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chlg++;
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}
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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_decode_digest_http_message()
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*
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* This is used to decode a HTTP DIGEST challenge message into the seperate
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* attributes.
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*
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* Parameters:
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*
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* chlg [in] - The challenge message.
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* digest [in/out] - The digest 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_digest_http_message(const char *chlg,
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struct digestdata *digest)
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{
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size_t chlglen = strlen(chlg);
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/* We had an input token before and we got another one now. This means we
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provided bad credentials in the previous request. */
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if(digest->input_token)
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return CURLE_BAD_CONTENT_ENCODING;
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/* Simply store the challenge for use later */
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digest->input_token = (BYTE *) Curl_memdup(chlg, chlglen + 1);
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if(!digest->input_token)
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return CURLE_OUT_OF_MEMORY;
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digest->input_token_len = chlglen;
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return CURLE_OK;
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}
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/*
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* Curl_auth_create_digest_http_message()
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*
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* This is used to generate a HTTP DIGEST response message ready for sending
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* 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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* passdwp [in] - The user's password.
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* request [in] - The HTTP request.
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* uripath [in] - The path of the HTTP uri.
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* digest [in/out] - The digest 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_digest_http_message(struct Curl_easy *data,
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const char *userp,
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const char *passwdp,
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const unsigned char *request,
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const unsigned char *uripath,
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struct digestdata *digest,
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char **outptr, size_t *outlen)
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{
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size_t token_max;
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CredHandle credentials;
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CtxtHandle context;
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char *resp;
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BYTE *output_token;
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PSecPkgInfo SecurityPackage;
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SEC_WINNT_AUTH_IDENTITY identity;
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SEC_WINNT_AUTH_IDENTITY *p_identity;
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SecBuffer chlg_buf[3];
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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 expiry; /* For Windows 9x compatibility of SSPI calls */
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TCHAR *spn;
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(void) data;
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/* Query the security package for DigestSSP */
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status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *) TEXT(SP_NAME_DIGEST),
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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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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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if(userp && *userp) {
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/* Populate our identity structure */
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if(Curl_create_sspi_identity(userp, passwdp, &identity))
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return CURLE_OUT_OF_MEMORY;
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/* Populate our identity domain */
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if(Curl_override_sspi_http_realm((const char *) digest->input_token,
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&identity))
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return CURLE_OUT_OF_MEMORY;
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/* Allow proper cleanup of the identity structure */
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p_identity = &identity;
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}
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else
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/* Use the current Windows user */
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p_identity = NULL;
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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_DIGEST),
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SECPKG_CRED_OUTBOUND, NULL,
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p_identity, NULL, NULL,
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&credentials, &expiry);
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if(status != SEC_E_OK) {
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Curl_sspi_free_identity(p_identity);
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return CURLE_LOGIN_DENIED;
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}
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/* Allocate the output buffer according to the max token size as indicated
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by the security package */
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output_token = malloc(token_max);
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if(!output_token) {
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s_pSecFn->FreeCredentialsHandle(&credentials);
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Curl_sspi_free_identity(p_identity);
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return CURLE_OUT_OF_MEMORY;
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}
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/* Setup the challenge "input" security buffer if present */
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chlg_desc.ulVersion = SECBUFFER_VERSION;
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chlg_desc.cBuffers = 3;
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chlg_desc.pBuffers = chlg_buf;
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chlg_buf[0].BufferType = SECBUFFER_TOKEN;
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chlg_buf[0].pvBuffer = digest->input_token;
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chlg_buf[0].cbBuffer = curlx_uztoul(digest->input_token_len);
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chlg_buf[1].BufferType = SECBUFFER_PKG_PARAMS;
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chlg_buf[1].pvBuffer = (void *) request;
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chlg_buf[1].cbBuffer = curlx_uztoul(strlen((const char *) request));
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chlg_buf[2].BufferType = SECBUFFER_PKG_PARAMS;
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chlg_buf[2].pvBuffer = NULL;
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chlg_buf[2].cbBuffer = 0;
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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 = output_token;
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resp_buf.cbBuffer = curlx_uztoul(token_max);
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spn = Curl_convert_UTF8_to_tchar((char *) uripath);
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if(!spn) {
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s_pSecFn->FreeCredentialsHandle(&credentials);
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Curl_sspi_free_identity(p_identity);
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free(output_token);
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return CURLE_OUT_OF_MEMORY;
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}
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/* Generate our reponse message */
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status = s_pSecFn->InitializeSecurityContext(&credentials, NULL,
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spn,
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ISC_REQ_USE_HTTP_STYLE, 0, 0,
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&chlg_desc, 0, &context,
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&resp_desc, &attrs, &expiry);
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Curl_unicodefree(spn);
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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(&credentials, &resp_desc);
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else if(status != SEC_E_OK && status != SEC_I_CONTINUE_NEEDED) {
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s_pSecFn->FreeCredentialsHandle(&credentials);
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Curl_sspi_free_identity(p_identity);
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free(output_token);
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return CURLE_OUT_OF_MEMORY;
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}
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resp = malloc(resp_buf.cbBuffer + 1);
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if(!resp) {
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s_pSecFn->DeleteSecurityContext(&context);
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s_pSecFn->FreeCredentialsHandle(&credentials);
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Curl_sspi_free_identity(p_identity);
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free(output_token);
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return CURLE_OUT_OF_MEMORY;
|
|
}
|
|
|
|
/* Copy the generated reponse */
|
|
memcpy(resp, resp_buf.pvBuffer, resp_buf.cbBuffer);
|
|
resp[resp_buf.cbBuffer] = 0x00;
|
|
|
|
/* Return the response */
|
|
*outptr = resp;
|
|
*outlen = resp_buf.cbBuffer;
|
|
|
|
/* Free our handles */
|
|
s_pSecFn->DeleteSecurityContext(&context);
|
|
s_pSecFn->FreeCredentialsHandle(&credentials);
|
|
|
|
/* Free the identity structure */
|
|
Curl_sspi_free_identity(p_identity);
|
|
|
|
/* Free the response buffer */
|
|
free(output_token);
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
/*
|
|
* Curl_auth_digest_cleanup()
|
|
*
|
|
* This is used to clean up the digest specific data.
|
|
*
|
|
* Parameters:
|
|
*
|
|
* digest [in/out] - The digest data struct being cleaned up.
|
|
*
|
|
*/
|
|
void Curl_auth_digest_cleanup(struct digestdata *digest)
|
|
{
|
|
/* Free the input token */
|
|
Curl_safefree(digest->input_token);
|
|
|
|
/* Reset any variables */
|
|
digest->input_token_len = 0;
|
|
}
|
|
|
|
#endif /* USE_WINDOWS_SSPI && !CURL_DISABLE_CRYPTO_AUTH */
|