/***********************************************************************
*
* Copyright (C) 2006 Novell, Inc. All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; version 2.1
* of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, Novell, Inc.
*
* To contact Novell about this file by physical or electronic mail,
* you may find current contact information at www.novell.com.
*
* Author: Juan Carlos Luciani <jluciani@novell.com>
*
***********************************************************************/
//===[ Include files ]=====================================================
#include "internal.h"
//===[ Type definitions ]==================================================
#define INITIAL_RESPONSE_DATA_BUF_SIZE 1028
#define INCREMENT_RESPONSE_DATA_BUF_SIZE 256
#define MAX_RPC_RETRIES 3
//===[ Function prototypes ]===============================================
//===[ Global variables ]==================================================
//++=======================================================================
static
CasaStatus
CopyMultiToWideAlloc(
IN char *pMulti,
IN int multiSize,
INOUT LPWSTR *ppWide,
INOUT int *pWideSize)
//
// Arguments:
//
// Returns:
//
// Abstract:
//
// Notes:
//
// L2
//=======================================================================--
{
int retStatus;
int size, i;
DbgTrace(2, "-CopyMultiToWideAlloc- Start\n", 0);
size = (multiSize + 1) * sizeof(WCHAR);
if ((*ppWide = (PWCHAR) malloc(size)) != NULL)
{
for (i = 0; i < multiSize; i++)
{
*(*ppWide + i) = (unsigned char) *(pMulti + i);
}
*(*ppWide + i) = L'\0';
if (pWideSize)
{
*pWideSize = size - sizeof(WCHAR);
}
retStatus = CASA_STATUS_SUCCESS;
}
else
{
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_INSUFFICIENT_RESOURCES);
}
DbgTrace(2, "-CopyMultiToWideAlloc- End, retStatus = %08X\n", retStatus);
return retStatus;
}
//++=======================================================================
static
CasaStatus
CopyWideToMultiAlloc(
IN LPWSTR pWide,
IN int wideSize,
INOUT char **ppMulti,
INOUT int *pMultiSize)
//
// Arguments:
//
// Returns:
//
// Abstract:
//
// Notes:
//
// L2
//=======================================================================--
{
int retStatus;
int size, i;
DbgTrace(2, "-CopyWideToMultiAlloc- Start\n", 0);
size = wideSize + 1;
if ((*ppMulti = malloc(size)) != NULL)
{
for (i = 0; i < wideSize; i++)
{
*(*ppMulti + i) = (char) *(pWide + i);
}
*(*ppMulti + i) = '\0';
if (pMultiSize)
{
*pMultiSize = size - 1;
}
retStatus = CASA_STATUS_SUCCESS;
}
else
{
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_INSUFFICIENT_RESOURCES);
}
DbgTrace(2, "-CopyWideToMultiAlloc- End, retStatus = %08X\n", retStatus);
return retStatus;
}
//++=======================================================================
RpcSession*
OpenRpcSession(
IN char *pHostName,
IN uint16_t hostPort)
//
// Arguments:
//
// Returns:
//
// Abstract:
//
// Notes:
//
// L2
//=======================================================================--
{
RpcSession *pSession;
bool success = false;
DbgTrace(1, "-OpenRpcSession- Start\n", 0);
// Allocate space for the session
pSession = (RpcSession*) malloc(sizeof(*pSession));
if (pSession)
{
// Zero the session structure
memset(pSession, 0, sizeof(*pSession));
// Save copy of the hostname
pSession->pHostName = malloc(strlen(pHostName) + 1);
if (pSession->pHostName)
{
strcpy(pSession->pHostName, pHostName);
// Open a Winhttp session
pSession->hSession = WinHttpOpen(L"CASA Client/1.0",
WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
WINHTTP_NO_PROXY_NAME,
WINHTTP_NO_PROXY_BYPASS,
0);
if (pSession->hSession)
{
LPWSTR pWideHostName;
int wideHostLen;
// Session opened, now convert the host name to Unicode so that
// we can open a connection.
if (CopyMultiToWideAlloc(pHostName,
(int) strlen(pHostName),
&pWideHostName,
&wideHostLen) == CASA_STATUS_SUCCESS)
{
// Now open connection
pSession->hConnection = WinHttpConnect(pSession->hSession,
pWideHostName,
hostPort,
0);
if (pSession->hConnection == NULL)
{
DbgTrace(0, "-OpenRpcSession- Failed to open connection, error = %d\n", GetLastError());
}
else
{
success = true;
}
// Free the host name wide string buffer
free(pWideHostName);
}
else
{
DbgTrace(0, "-OpenRpcSession- Error converting host name to wide string\n", 0);
}
}
else
{
DbgTrace(0, "-OpenRpcSession- Failed to open session, error = %d\n", GetLastError());
}
}
else
{
DbgTrace(0, "-OpenRpcSession- Failed to allocate buffer for host name\n", 0);
}
}
else
{
DbgTrace(0, "-OpenRpcSession- Failed to allocate buffer for rpc session\n", 0);
}
// Clean up if we did not succeed
if (!success)
{
if (pSession)
{
if (pSession->hConnection)
WinHttpCloseHandle(pSession->hConnection);
if (pSession->hSession)
WinHttpCloseHandle(pSession->hSession);
if (pSession->pHostName)
free(pSession->pHostName);
free(pSession);
pSession = NULL;
}
}
DbgTrace(2, "-OpenRpcSession- End, pSession = %08X\n", pSession);
return pSession;
}
//++=======================================================================
void
CloseRpcSession(
IN RpcSession *pSession)
//
// Arguments:
//
// Returns:
//
// Abstract:
//
// Notes:
//
// L2
//=======================================================================--
{
DbgTrace(1, "-CloseRpcSession- Start\n", 0);
// Close the connection handle
WinHttpCloseHandle(pSession->hConnection);
// Close the session handle
WinHttpCloseHandle(pSession->hSession);
// Free hostname buffer if necessary
if (pSession->pHostName)
free(pSession->pHostName);
// Free the space allocated for the session
free(pSession);
DbgTrace(1, "-CloseRpcSession- End\n", 0);
}
//++=======================================================================
static
void CALLBACK
SecureFailureStatusCallback(
IN HINTERNET hRequest,
IN DWORD *pContext,
IN DWORD internetStatus,
IN LPVOID pStatusInformation,
IN DWORD statusInformationLength)
//
// Arguments:
//
// Returns:
//
// Abstract:
//
// Notes:
//
// L0
//=======================================================================--
{
DbgTrace(1, "-SecureFailureStatusCallback- Start\n", 0);
// Only deal with failures related to certificates
if (internetStatus == WINHTTP_CALLBACK_STATUS_SECURE_FAILURE)
{
// Save the specific failure status
*pContext = *(DWORD*) pStatusInformation;
}
DbgTrace(1, "-SecureFailureStatusCallback- End\n", 0);
}
//++=======================================================================
static
CasaStatus
InternalRpc(
IN RpcSession *pSession,
IN char *pMethod,
IN long flags,
IN char *pRequestData,
INOUT char **ppResponseData,
INOUT int *pResponseDataLen)
//
// Arguments:
//
// Returns:
//
// Abstract:
//
// Notes:
//
// L2
//=======================================================================--
{
#define CASA_STATUS_INVALID_SERVER_CERTIFICATE CASA_STATUS_UNSUCCESSFUL // temporary until casa_status.h is updated
CasaStatus retStatus = CASA_STATUS_SUCCESS;
char rpcTarget[256];
LPWSTR pWideRpcTarget;
int wideRpcTargetLen;
WCHAR sendHeaders[] = L"Content-Type: text/html";
DWORD securityFailureStatusFlags;
int retriesAllowed = 1;
bool attemptRetry;
DbgTrace(1, "-InternalRpc- Start\n", 0);
// Initialize output parameter
*ppResponseData = NULL;
// Create rpc target string and convert it to a wide string
sprintf(rpcTarget, "CasaAuthTokenSvc/Rpc?method=%s", pMethod);
retStatus = CopyMultiToWideAlloc(rpcTarget,
(int) strlen(rpcTarget),
&pWideRpcTarget,
&wideRpcTargetLen);
if (CASA_SUCCESS(retStatus))
{
HINTERNET hRequest;
do
{
// Forget about having been told to retry
attemptRetry = false;
// Open a request handle
hRequest = WinHttpOpenRequest(pSession->hConnection,
L"POST",
pWideRpcTarget,
NULL,
WINHTTP_NO_REFERER,
WINHTTP_DEFAULT_ACCEPT_TYPES,
flags & SECURE_RPC_FLAG? WINHTTP_FLAG_REFRESH | WINHTTP_FLAG_SECURE : WINHTTP_FLAG_REFRESH);
if (hRequest)
{
int reqDataLen = (int) strlen(pRequestData);
// Check if we need to set options to deal with secure connections
if (flags & SECURE_RPC_FLAG)
{
// We are using secure connections, now proceed based on whether or not
// we are configured to allow invalid certificates.
if (flags & ALLOW_INVALID_CERTS_RPC_FLAG
|| (flags & ALLOW_INVALID_CERTS_USER_APPROVAL_RPC_FLAG
&& InvalidCertsFromHostAllowed(pSession->pHostName)))
{
DWORD secFlags = SECURITY_FLAG_IGNORE_CERT_CN_INVALID | SECURITY_FLAG_IGNORE_UNKNOWN_CA;
// We are configured to allow invalid certificates, inform the HTTP stack.
if (WinHttpSetOption(hRequest,
WINHTTP_OPTION_SECURITY_FLAGS,
&secFlags,
sizeof(secFlags)) == FALSE)
{
DbgTrace(0, "-InternalRpc- Failed setting options to ignore invalid certs, error = %d\n", GetLastError());
}
}
else
{
// We are not configured to allow invalid certificates, set a callback handler
// to detect invalid certificate conditions.
if (WinHttpSetStatusCallback(hRequest,
SecureFailureStatusCallback,
WINHTTP_CALLBACK_FLAG_SECURE_FAILURE,
(DWORD_PTR) NULL) == WINHTTP_INVALID_STATUS_CALLBACK)
{
DbgTrace(0, "-InternalRpc- Failed setting status callback, error = %d\n", GetLastError());
}
}
}
// Send the request
securityFailureStatusFlags = 0;
if (WinHttpSendRequest(hRequest,
sendHeaders,
-1,
pRequestData,
reqDataLen,
reqDataLen,
(DWORD_PTR) &securityFailureStatusFlags))
{
// Request sent, now await for the response.
if (WinHttpReceiveResponse(hRequest, NULL))
{
WCHAR httpCompStatus[4] = {0};
DWORD httpCompStatusLen = sizeof(httpCompStatus);
// Response received, make sure that it completed successfully.
if (WinHttpQueryHeaders(hRequest,
WINHTTP_QUERY_STATUS_CODE,
NULL,
&httpCompStatus,
&httpCompStatusLen,
WINHTTP_NO_HEADER_INDEX))
{
// Check that the request completed successfully
if (memcmp(httpCompStatus, L"200", sizeof(httpCompStatus)) == 0)
{
char *pResponseData;
int responseDataBufSize = INITIAL_RESPONSE_DATA_BUF_SIZE;
int responseDataRead = 0;
// Now read the response data, to do so we need to allocate a buffer.
pResponseData = (char*) malloc(INITIAL_RESPONSE_DATA_BUF_SIZE);
if (pResponseData)
{
char *pCurrLocation = pResponseData;
DWORD bytesRead;
do
{
bytesRead = 0;
if (WinHttpReadData(hRequest,
(LPVOID) pCurrLocation,
responseDataBufSize - responseDataRead,
&bytesRead))
{
pCurrLocation += bytesRead;
responseDataRead += bytesRead;
// Check if we need to allocate a larger buffer
if (responseDataRead == responseDataBufSize)
{
char *pTmpBuf;
// We need to upgrade the receive buffer
pTmpBuf = (char*) malloc(responseDataBufSize + INCREMENT_RESPONSE_DATA_BUF_SIZE);
if (pTmpBuf)
{
memcpy(pTmpBuf, pResponseData, responseDataBufSize);
free(pResponseData);
pResponseData = pTmpBuf;
pCurrLocation = pResponseData + responseDataBufSize;
responseDataBufSize += INCREMENT_RESPONSE_DATA_BUF_SIZE;
}
else
{
DbgTrace(0, "-InternalRpc- Buffer allocation failure\n", 0);
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_INSUFFICIENT_RESOURCES);
}
}
}
else
{
DbgTrace(0, "-InternalRpc- Failed reading response data, error = %d\n", GetLastError());
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_UNSUCCESSFUL);
}
} while (CASA_SUCCESS(retStatus)
&& bytesRead != 0);
// Check if the response data was successfully received
if (CASA_SUCCESS(retStatus))
{
// The response data was received, return it to the caller.
*ppResponseData = pResponseData;
*pResponseDataLen = responseDataRead;
}
else
{
// Failed to receive the response data, free the allocated buffer.
free(pResponseData);
}
}
else
{
DbgTrace(0, "-InternalRpc- Buffer allocation failure\n", 0);
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_INSUFFICIENT_RESOURCES);
}
}
else
{
DbgTrace(0, "-InternalRpc- HTTP request did not complete successfully, status = %S\n", httpCompStatus);
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_UNSUCCESSFUL);
}
}
else
{
DbgTrace(0, "-InternalRpc- Unable to obtain http request completion status, error = %d\n", GetLastError());
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_UNSUCCESSFUL);
}
}
else
{
DbgTrace(0, "-InternalRpc- Unable to receive response, error = %d\n", GetLastError());
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_UNSUCCESSFUL);
}
}
else
{
int error = GetLastError();
if (error == ERROR_WINHTTP_CANNOT_CONNECT)
{
DbgTrace(0, "-InternalRpc- Unable to connect to server\n", 0);
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_AUTH_SERVER_UNAVAILABLE);
}
else if (error == ERROR_WINHTTP_SECURE_FAILURE)
{
DbgTrace(1, "-InternalRpc- Secure connection failure, flags = %0x\n", securityFailureStatusFlags);
// Try to deal with the issue
if ((securityFailureStatusFlags & ~(WINHTTP_CALLBACK_STATUS_FLAG_INVALID_CA
| WINHTTP_CALLBACK_STATUS_FLAG_CERT_CN_INVALID
| WINHTTP_CALLBACK_STATUS_FLAG_CERT_DATE_INVALID)) == 0
&& flags & ALLOW_INVALID_CERTS_USER_APPROVAL_RPC_FLAG)
{
WINHTTP_CERTIFICATE_INFO certInfo;
DWORD certInfoLen = sizeof(certInfo);
// The failure was due to an invalid CN, CA, or both.
//
// Obtain information about the server certificate to give user
// the choice of accepting it.
if (WinHttpQueryOption(hRequest,
WINHTTP_OPTION_SECURITY_CERTIFICATE_STRUCT,
&certInfo,
&certInfoLen)
&& certInfo.lpszSubjectInfo != NULL
&& certInfo.lpszIssuerInfo != NULL)
{
char *pSubjectInfo;
int subjectInfoLen;
// Convert the subjectInfo to multi-byte
retStatus = CopyWideToMultiAlloc(certInfo.lpszSubjectInfo,
(int) wcslen(certInfo.lpszSubjectInfo),
&pSubjectInfo,
&subjectInfoLen);
if (CASA_SUCCESS(retStatus))
{
char *pIssuerInfo;
int issuerInfoLen;
// Convert the issuerInfo to multi-byte
retStatus = CopyWideToMultiAlloc(certInfo.lpszIssuerInfo,
(int) wcslen(certInfo.lpszIssuerInfo),
&pIssuerInfo,
&issuerInfoLen);
if (CASA_SUCCESS(retStatus))
{
long invalidCertFlags = 0;
// Setup the invalid cert flags
if (securityFailureStatusFlags & WINHTTP_CALLBACK_STATUS_FLAG_INVALID_CA)
invalidCertFlags |= INVALID_CERT_CA_FLAG;
if (securityFailureStatusFlags & WINHTTP_CALLBACK_STATUS_FLAG_CERT_CN_INVALID)
invalidCertFlags |= INVALID_CERT_CN_FLAG;
if (securityFailureStatusFlags & WINHTTP_CALLBACK_STATUS_FLAG_CERT_DATE_INVALID)
invalidCertFlags |= INVALID_CERT_DATE_FLAG;
// Give user the choice to accept the certificate
if (UserApprovedCert(pSession->pHostName,
pSubjectInfo,
pIssuerInfo,
invalidCertFlags))
{
DbgTrace(1, "-InternalRpc- User approved invalid certificate from %s\n", pSession->pHostName);
// tbd - Investigate if there is a way to set the accepted certificate in a store so that
// it can be utilized by the SSL stack directly. This would be a better method for dealing with
// this issue.
AllowInvalidCertsFromHost(pSession->pHostName);
// Try to retry the request
attemptRetry = true;
}
else
{
DbgTrace(1, "-InternalRpc- User did not approve invalid certificate from %s\n", pSession->pHostName);
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_INVALID_SERVER_CERTIFICATE);
}
// Free the buffer containing the issuerInfo
free(pIssuerInfo);
}
// Free the buffer containing the subjectInfo
free(pSubjectInfo);
}
// Free necessary certificate information
if (certInfo.lpszSubjectInfo) LocalFree(certInfo.lpszSubjectInfo);
if (certInfo.lpszIssuerInfo) LocalFree(certInfo.lpszIssuerInfo);
if (certInfo.lpszProtocolName) LocalFree(certInfo.lpszProtocolName);
if (certInfo.lpszSignatureAlgName) LocalFree(certInfo.lpszSignatureAlgName);
if (certInfo.lpszEncryptionAlgName) LocalFree(certInfo.lpszEncryptionAlgName);
}
else
{
DbgTrace(0, "-InternalRpc- Unable to obtain server certificate struct, error = %0x\n", GetLastError());
}
}
else
{
// Decided to no give the user a choice to accept invalid server certificate
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_INVALID_SERVER_CERTIFICATE);
}
}
else
{
DbgTrace(0, "-InternalRpc- Unsuccessful send http request, error = %d\n", error);
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_UNSUCCESSFUL);
}
}
// Close the request handle
WinHttpCloseHandle(hRequest);
}
else
{
DbgTrace(0, "-InternalRpc- Unable to open http request, error = %d\n", GetLastError());
retStatus = CasaStatusBuild(CASA_SEVERITY_ERROR,
CASA_FACILITY_AUTHTOKEN,
CASA_STATUS_UNSUCCESSFUL);
}
} while (attemptRetry && retriesAllowed--);
// Free the rpc target wide string buffer
free(pWideRpcTarget);
}
else
{
DbgTrace(0, "-InternalRpc- Error converting method name to wide string\n", 0);
}
DbgTrace(1, "-InternalRpc- End, retStatus = %d\n", retStatus);
return retStatus;
}
//++=======================================================================
CasaStatus
Rpc(
IN RpcSession *pSession,
IN char *pMethod,
IN long flags,
IN char *pRequestData,
INOUT char **ppResponseData,
INOUT int *pResponseDataLen)
//
// Arguments:
//
// Returns:
//
// Abstract:
//
// Notes:
//
// L2
//=======================================================================--
{
CasaStatus retStatus;
int retries = 0;
DbgTrace(1, "-Rpc- Start\n", 0);
// Retry the RPC as needed
do
{
// Issue the RPC
retStatus = InternalRpc(pSession,
pMethod,
flags,
pRequestData,
ppResponseData,
pResponseDataLen);
// Account for this try
retries ++;
} while (CasaStatusCode(retStatus) == CASA_STATUS_AUTH_SERVER_UNAVAILABLE
&& retries < MAX_RPC_RETRIES);
DbgTrace(1, "-Rpc- End, retStatus = %d\n", retStatus);
return retStatus;
}
//++=======================================================================
CasaStatus
InitializeRpc(void)
//
// Arguments:
//
// Returns:
//
// Abstract:
//
// Notes:
//
// L2
//=======================================================================--
{
CasaStatus retStatus = CASA_STATUS_SUCCESS;
DbgTrace(1, "-InitializeRpc- Start\n", 0);
// Nothing to do for windows
DbgTrace(1, "-InitializeRpc- End, retStatus = %08X\n", retStatus);
return retStatus;
}
//++=======================================================================
//++=======================================================================
//++=======================================================================