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/* $Id: AuthLibrary.cpp $ */
/** @file
* Main - External authentication library interface.
*/
/*
* Copyright (C) 2015-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#define LOG_GROUP LOG_GROUP_MAIN
#include "AuthLibrary.h"
#include "LoggingNew.h"
#include <iprt/err.h>
#include <iprt/ldr.h>
#include <iprt/path.h>
#include <iprt/string.h>
#include <iprt/thread.h>
typedef struct AuthCtx
{
AuthResult result;
PAUTHENTRY3 pfnAuthEntry3;
PAUTHENTRY2 pfnAuthEntry2;
PAUTHENTRY pfnAuthEntry;
const char *pszCaller;
PAUTHUUID pUuid;
AuthGuestJudgement guestJudgement;
const char *pszUser;
const char *pszPassword;
const char *pszDomain;
int fLogon;
unsigned clientId;
} AuthCtx;
static DECLCALLBACK(int) authThread(RTTHREAD hThreadSelf, void *pvUser)
{
RT_NOREF(hThreadSelf);
AuthCtx *pCtx = (AuthCtx *)pvUser;
if (pCtx->pfnAuthEntry3)
{
pCtx->result = pCtx->pfnAuthEntry3(pCtx->pszCaller, pCtx->pUuid, pCtx->guestJudgement,
pCtx->pszUser, pCtx->pszPassword, pCtx->pszDomain,
pCtx->fLogon, pCtx->clientId);
}
else if (pCtx->pfnAuthEntry2)
{
pCtx->result = pCtx->pfnAuthEntry2(pCtx->pUuid, pCtx->guestJudgement,
pCtx->pszUser, pCtx->pszPassword, pCtx->pszDomain,
pCtx->fLogon, pCtx->clientId);
}
else if (pCtx->pfnAuthEntry)
{
pCtx->result = pCtx->pfnAuthEntry(pCtx->pUuid, pCtx->guestJudgement,
pCtx->pszUser, pCtx->pszPassword, pCtx->pszDomain);
}
return VINF_SUCCESS;
}
static AuthResult authCall(AuthCtx *pCtx)
{
AuthResult result = AuthResultAccessDenied;
/* Use a separate thread because external modules might need a lot of stack space. */
RTTHREAD thread = NIL_RTTHREAD;
int vrc = RTThreadCreate(&thread, authThread, pCtx, 512*_1K,
RTTHREADTYPE_DEFAULT, RTTHREADFLAGS_WAITABLE, "VRDEAuth");
LogFlowFunc(("RTThreadCreate %Rrc\n", vrc));
if (RT_SUCCESS(vrc))
{
vrc = RTThreadWait(thread, RT_INDEFINITE_WAIT, NULL);
LogFlowFunc(("RTThreadWait %Rrc\n", vrc));
}
if (RT_SUCCESS(vrc))
{
/* Only update the result if the thread finished without errors. */
result = pCtx->result;
}
else
{
LogRel(("AUTH: Unable to execute the auth thread %Rrc\n", vrc));
}
return result;
}
int AuthLibLoad(AUTHLIBRARYCONTEXT *pAuthLibCtx, const char *pszLibrary)
{
RT_ZERO(*pAuthLibCtx);
/* Load the external authentication library. */
LogRel(("AUTH: Loading external authentication library '%s'\n", pszLibrary));
int vrc;
if (RTPathHavePath(pszLibrary))
vrc = RTLdrLoad(pszLibrary, &pAuthLibCtx->hAuthLibrary);
else
{
vrc = RTLdrLoadAppPriv(pszLibrary, &pAuthLibCtx->hAuthLibrary);
if (RT_FAILURE(vrc))
{
/* Backward compatibility with old default 'VRDPAuth' name.
* Try to load new default 'VBoxAuth' instead.
*/
if (RTStrICmp(pszLibrary, "VRDPAuth") == 0)
{
LogRel(("AUTH: Loading external authentication library 'VBoxAuth'\n"));
vrc = RTLdrLoadAppPriv("VBoxAuth", &pAuthLibCtx->hAuthLibrary);
}
}
}
if (RT_FAILURE(vrc))
{
LogRel(("AUTH: Failed to load external authentication library: %Rrc\n", vrc));
pAuthLibCtx->hAuthLibrary = NIL_RTLDRMOD;
}
if (RT_SUCCESS(vrc))
{
typedef struct AuthEntryInfoStruct
{
const char *pszName;
void **ppvAddress;
} AuthEntryInfo;
AuthEntryInfo entries[] =
{
{ AUTHENTRY3_NAME, (void **)&pAuthLibCtx->pfnAuthEntry3 },
{ AUTHENTRY2_NAME, (void **)&pAuthLibCtx->pfnAuthEntry2 },
{ AUTHENTRY_NAME, (void **)&pAuthLibCtx->pfnAuthEntry },
{ NULL, NULL }
};
/* Get the entry point. */
AuthEntryInfo *pEntryInfo = &entries[0];
while (pEntryInfo->pszName)
{
*pEntryInfo->ppvAddress = NULL;
int vrc2 = RTLdrGetSymbol(pAuthLibCtx->hAuthLibrary, pEntryInfo->pszName, pEntryInfo->ppvAddress);
if (RT_SUCCESS(vrc2))
{
/* Found an entry point. */
LogRel(("AUTH: Using entry point '%s'\n", pEntryInfo->pszName));
vrc = VINF_SUCCESS;
break;
}
if (vrc2 != VERR_SYMBOL_NOT_FOUND)
LogRel(("AUTH: Could not resolve import '%s': %Rrc\n", pEntryInfo->pszName, vrc2));
vrc = vrc2;
pEntryInfo++;
}
}
if (RT_FAILURE(vrc))
AuthLibUnload(pAuthLibCtx);
return vrc;
}
void AuthLibUnload(AUTHLIBRARYCONTEXT *pAuthLibCtx)
{
if (pAuthLibCtx->hAuthLibrary != NIL_RTLDRMOD)
RTLdrClose(pAuthLibCtx->hAuthLibrary);
RT_ZERO(*pAuthLibCtx);
pAuthLibCtx->hAuthLibrary = NIL_RTLDRMOD;
}
AuthResult AuthLibAuthenticate(const AUTHLIBRARYCONTEXT *pAuthLibCtx,
PCRTUUID pUuid, AuthGuestJudgement guestJudgement,
const char *pszUser, const char *pszPassword, const char *pszDomain,
uint32_t u32ClientId)
{
AuthResult result = AuthResultAccessDenied;
AUTHUUID rawuuid;
memcpy(rawuuid, pUuid, sizeof(rawuuid));
LogFlowFunc(("pAuthLibCtx = %p, uuid = %RTuuid, guestJudgement = %d, pszUser = %s, pszPassword = %s, pszDomain = %s, u32ClientId = %d\n",
pAuthLibCtx, rawuuid, guestJudgement, pszUser, pszPassword, pszDomain, u32ClientId));
if ( pAuthLibCtx->hAuthLibrary
&& (pAuthLibCtx->pfnAuthEntry || pAuthLibCtx->pfnAuthEntry2 || pAuthLibCtx->pfnAuthEntry3))
{
AuthCtx ctx;
ctx.result = AuthResultAccessDenied; /* Denied by default. */
ctx.pfnAuthEntry3 = pAuthLibCtx->pfnAuthEntry3;
ctx.pfnAuthEntry2 = pAuthLibCtx->pfnAuthEntry2;
ctx.pfnAuthEntry = pAuthLibCtx->pfnAuthEntry;
ctx.pszCaller = "vrde";
ctx.pUuid = &rawuuid;
ctx.guestJudgement = guestJudgement;
ctx.pszUser = pszUser;
ctx.pszPassword = pszPassword;
ctx.pszDomain = pszDomain;
ctx.fLogon = true;
ctx.clientId = u32ClientId;
result = authCall(&ctx);
}
else
{
LogRelMax(8, ("AUTH: Invalid authentication module context\n"));
AssertFailed();
}
LogFlowFunc(("result = %d\n", result));
return result;
}
void AuthLibDisconnect(const AUTHLIBRARYCONTEXT *pAuthLibCtx, PCRTUUID pUuid, uint32_t u32ClientId)
{
AUTHUUID rawuuid;
memcpy(rawuuid, pUuid, sizeof(rawuuid));
LogFlowFunc(("pAuthLibCtx = %p, , uuid = %RTuuid, u32ClientId = %d\n",
pAuthLibCtx, rawuuid, u32ClientId));
if ( pAuthLibCtx->hAuthLibrary
&& (pAuthLibCtx->pfnAuthEntry || pAuthLibCtx->pfnAuthEntry2 || pAuthLibCtx->pfnAuthEntry3))
{
AuthCtx ctx;
ctx.result = AuthResultAccessDenied; /* Not used. */
ctx.pfnAuthEntry3 = pAuthLibCtx->pfnAuthEntry3;
ctx.pfnAuthEntry2 = pAuthLibCtx->pfnAuthEntry2;
ctx.pfnAuthEntry = NULL; /* Does not use disconnect notification. */
ctx.pszCaller = "vrde";
ctx.pUuid = &rawuuid;
ctx.guestJudgement = AuthGuestNotAsked;
ctx.pszUser = NULL;
ctx.pszPassword = NULL;
ctx.pszDomain = NULL;
ctx.fLogon = false;
ctx.clientId = u32ClientId;
authCall(&ctx);
}
}
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