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sspwin32.c
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sspwin32.c
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/*
* $Id: sspwin32.c,v 1.2 2006/09/09 15:41:45 serassio Exp $
*
* AUTHOR: Guido Serassio <serassio@squid-cache.org>
* inspired by previous work by Robert Collins, Francesco Chemolli.
*
* SQUID Web Proxy Cache http://www.squid-cache.org/
* ----------------------------------------------------------
*
* Squid is the result of efforts by numerous individuals from
* the Internet community; see the CONTRIBUTORS file for full
* details. Many organizations have provided support for Squid's
* development; see the SPONSORS file for full details. Squid is
* Copyrighted (C) 2001 by the Regents of the University of
* California; see the COPYRIGHT file for full details. Squid
* incorporates software developed and/or copyrighted by other
* sources; see the CREDITS file for full details.
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
*/
#include "util.h"
#include "ntlmauth.h"
#include "sspwin32.h"
typedef struct _AUTH_SEQ {
BOOL fInitialized;
BOOL fHaveCredHandle;
BOOL fHaveCtxtHandle;
CredHandle hcred;
TimeStamp hcredLifeTime;
struct _SecHandle hctxt;
TimeStamp hctxtLifeTime;
} AUTH_SEQ, *PAUTH_SEQ;
static HMODULE hModule;
static int NTLM_mode = SSP_BASIC;
static char *SSP_Package_InUse;
SECURITY_STATUS SecurityStatus = SEC_E_OK;
static DWORD cbMaxToken = 0;
static PVOID pClientBuf = NULL;
static PVOID pServerBuf = NULL;
static AUTH_SEQ NTLM_asServer =
{0};
BOOL Use_Unicode = FALSE;
BOOL NTLM_LocalCall = FALSE;
/* Function pointers */
ACCEPT_SECURITY_CONTEXT_FN _AcceptSecurityContext = NULL;
ACQUIRE_CREDENTIALS_HANDLE_FN _AcquireCredentialsHandle = NULL;
COMPLETE_AUTH_TOKEN_FN _CompleteAuthToken = NULL;
DELETE_SECURITY_CONTEXT_FN _DeleteSecurityContext = NULL;
FREE_CONTEXT_BUFFER_FN _FreeContextBuffer = NULL;
FREE_CREDENTIALS_HANDLE_FN _FreeCredentialsHandle = NULL;
INITIALIZE_SECURITY_CONTEXT_FN _InitializeSecurityContext = NULL;
QUERY_SECURITY_PACKAGE_INFO_FN _QuerySecurityPackageInfo = NULL;
#ifdef UNICODE
QUERY_CONTEXT_ATTRIBUTES_FN_W _QueryContextAttributes = NULL;
#else
QUERY_CONTEXT_ATTRIBUTES_FN_A _QueryContextAttributes = NULL;
#endif
void
UnloadSecurityDll(void)
{
if (NTLM_asServer.fHaveCtxtHandle)
_DeleteSecurityContext(&NTLM_asServer.hctxt);
if (NTLM_asServer.fHaveCredHandle)
_FreeCredentialsHandle(&NTLM_asServer.hcred);
if (hModule)
FreeLibrary(hModule);
xfree(SSP_Package_InUse);
xfree(pClientBuf);
xfree(pServerBuf);
_AcceptSecurityContext = NULL;
_AcquireCredentialsHandle = NULL;
_CompleteAuthToken = NULL;
_DeleteSecurityContext = NULL;
_FreeContextBuffer = NULL;
_FreeCredentialsHandle = NULL;
_InitializeSecurityContext = NULL;
_QuerySecurityPackageInfo = NULL;
_QueryContextAttributes = NULL;
hModule = NULL;
}
HMODULE
LoadSecurityDll(int mode, char *SSP_Package)
{
TCHAR lpszDLL[MAX_PATH];
OSVERSIONINFO VerInfo;
PSecPkgInfo pSPI = NULL;
/*
* * Find out which security DLL to use, depending on
* * whether we are on NT or 2000 or XP or 2003 Server
* * We have to use security.dll on Windows NT 4.0.
* * All other operating systems, we have to use Secur32.dll
*/
hModule = NULL;
if ((mode != SSP_BASIC) && (mode != SSP_NTLM))
return hModule;
NTLM_mode = mode;
VerInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
if (!GetVersionEx(&VerInfo)) { /* If this fails, something has gone wrong */
return hModule;
}
if (VerInfo.dwPlatformId == VER_PLATFORM_WIN32_NT &&
VerInfo.dwMajorVersion == 4 &&
VerInfo.dwMinorVersion == 0) {
lstrcpy(lpszDLL, _T(WINNT_SECURITY_DLL));
} else {
lstrcpy(lpszDLL, _T(WIN2K_SECURITY_DLL));
}
hModule = LoadLibrary(lpszDLL);
if (!hModule)
return hModule;
_AcceptSecurityContext = (ACCEPT_SECURITY_CONTEXT_FN)
GetProcAddress(hModule, "AcceptSecurityContext");
if (!_AcceptSecurityContext) {
UnloadSecurityDll();
hModule = NULL;
return hModule;
}
#ifdef UNICODE
_AcquireCredentialsHandle = (ACQUIRE_CREDENTIALS_HANDLE_FN)
GetProcAddress(hModule, "AcquireCredentialsHandleW");
#else
_AcquireCredentialsHandle = (ACQUIRE_CREDENTIALS_HANDLE_FN)
GetProcAddress(hModule, "AcquireCredentialsHandleA");
#endif
if (!_AcquireCredentialsHandle) {
UnloadSecurityDll();
hModule = NULL;
return hModule;
}
_CompleteAuthToken = (COMPLETE_AUTH_TOKEN_FN)
GetProcAddress(hModule, "CompleteAuthToken");
if (!_CompleteAuthToken) {
UnloadSecurityDll();
hModule = NULL;
return hModule;
}
_DeleteSecurityContext = (DELETE_SECURITY_CONTEXT_FN)
GetProcAddress(hModule, "DeleteSecurityContext");
if (!_DeleteSecurityContext) {
UnloadSecurityDll();
hModule = NULL;
return hModule;
}
_FreeContextBuffer = (FREE_CONTEXT_BUFFER_FN)
GetProcAddress(hModule, "FreeContextBuffer");
if (!_FreeContextBuffer) {
UnloadSecurityDll();
hModule = NULL;
return hModule;
}
_FreeCredentialsHandle = (FREE_CREDENTIALS_HANDLE_FN)
GetProcAddress(hModule, "FreeCredentialsHandle");
if (!_FreeCredentialsHandle) {
UnloadSecurityDll();
hModule = NULL;
return hModule;
}
#ifdef UNICODE
_InitializeSecurityContext = (INITIALIZE_SECURITY_CONTEXT_FN)
GetProcAddress(hModule, "InitializeSecurityContextW");
#else
_InitializeSecurityContext = (INITIALIZE_SECURITY_CONTEXT_FN)
GetProcAddress(hModule, "InitializeSecurityContextA");
#endif
if (!_InitializeSecurityContext) {
UnloadSecurityDll();
hModule = NULL;
return hModule;
}
#ifdef UNICODE
_QuerySecurityPackageInfo = (QUERY_SECURITY_PACKAGE_INFO_FN)
GetProcAddress(hModule, "QuerySecurityPackageInfoW");
#else
_QuerySecurityPackageInfo = (QUERY_SECURITY_PACKAGE_INFO_FN)
GetProcAddress(hModule, "QuerySecurityPackageInfoA");
#endif
if (!_QuerySecurityPackageInfo) {
UnloadSecurityDll();
hModule = NULL;
}
#ifdef UNICODE
_QueryContextAttributes = (QUERY_CONTEXT_ATTRIBUTES_FN_W)
GetProcAddress(hModule, "QueryContextAttributesW");
#else
_QueryContextAttributes = (QUERY_CONTEXT_ATTRIBUTES_FN_A)
GetProcAddress(hModule, "QueryContextAttributesA");
#endif
if (!_QueryContextAttributes) {
UnloadSecurityDll();
hModule = NULL;
}
/* Get max token size */
_QuerySecurityPackageInfo(_T(SSP_Package), &pSPI);
cbMaxToken = pSPI->cbMaxToken;
_FreeContextBuffer(pSPI);
/* Allocate buffers for client and server messages */
pClientBuf = xcalloc(cbMaxToken, sizeof(char));
pServerBuf = xcalloc(cbMaxToken, sizeof(char));
SSP_Package_InUse = xstrdup(SSP_Package);
return hModule;
}
BOOL
GenClientContext(PAUTH_SEQ pAS, PSEC_WINNT_AUTH_IDENTITY pAuthIdentity,
PVOID pIn, DWORD cbIn, PVOID pOut, PDWORD pcbOut, PBOOL pfDone)
{
/*
* Routine Description:
*
* Optionally takes an input buffer coming from the server and returns
* a buffer of information to send back to the server. Also returns
* an indication of whether or not the context is complete.
*
* Return Value:
* Returns TRUE if successful; otherwise FALSE.
*/
TimeStamp tsExpiry;
SecBufferDesc sbdOut;
SecBuffer sbOut;
SecBufferDesc sbdIn;
SecBuffer sbIn;
ULONG fContextAttr;
if (!pAS->fInitialized) {
SecurityStatus = _AcquireCredentialsHandle(NULL, _T(SSP_Package_InUse),
SECPKG_CRED_OUTBOUND, NULL, (NTLM_mode == SSP_NTLM) ? NULL : pAuthIdentity, NULL, NULL,
&pAS->hcred, &tsExpiry);
if (SecurityStatus < 0)
return FALSE;
pAS->fHaveCredHandle = TRUE;
}
/* Prepare output buffer */
sbdOut.ulVersion = 0;
sbdOut.cBuffers = 1;
sbdOut.pBuffers = &sbOut;
sbOut.cbBuffer = *pcbOut;
sbOut.BufferType = SECBUFFER_TOKEN;
sbOut.pvBuffer = pOut;
/* Prepare input buffer */
if (pAS->fInitialized) {
sbdIn.ulVersion = 0;
sbdIn.cBuffers = 1;
sbdIn.pBuffers = &sbIn;
sbIn.cbBuffer = cbIn;
sbIn.BufferType = SECBUFFER_TOKEN;
sbIn.pvBuffer = pIn;
}
SecurityStatus = _InitializeSecurityContext(&pAS->hcred,
pAS->fInitialized ? &pAS->hctxt : NULL, NULL, 0, 0,
SECURITY_NATIVE_DREP, pAS->fInitialized ? &sbdIn : NULL,
0, &pAS->hctxt, &sbdOut, &fContextAttr, &tsExpiry);
if (SecurityStatus < 0)
return FALSE;
pAS->fHaveCtxtHandle = TRUE;
/* If necessary, complete token */
if (SecurityStatus == SEC_I_COMPLETE_NEEDED || SecurityStatus == SEC_I_COMPLETE_AND_CONTINUE) {
SecurityStatus = _CompleteAuthToken(&pAS->hctxt, &sbdOut);
if (SecurityStatus < 0)
return FALSE;
}
*pcbOut = sbOut.cbBuffer;
if (!pAS->fInitialized)
pAS->fInitialized = TRUE;
*pfDone = !(SecurityStatus == SEC_I_CONTINUE_NEEDED
|| SecurityStatus == SEC_I_COMPLETE_AND_CONTINUE);
return TRUE;
}
BOOL
GenServerContext(PAUTH_SEQ pAS, PVOID pIn, DWORD cbIn, PVOID pOut,
PDWORD pcbOut, PBOOL pfDone, char *credentials)
{
/*
* Routine Description:
*
* Takes an input buffer coming from the client and returns a buffer
* to be sent to the client. Also returns an indication of whether or
* not the context is complete.
*
* Return Value:
*
* Returns TRUE if successful; otherwise FALSE.
*/
SecBufferDesc sbdOut;
SecBuffer sbOut;
SecBufferDesc sbdIn;
SecBuffer sbIn;
ULONG fContextAttr;
SecPkgContext_Names namebuffer;
if (!pAS->fInitialized) {
SecurityStatus = _AcquireCredentialsHandle(NULL, _T(SSP_Package_InUse),
SECPKG_CRED_INBOUND, NULL, NULL, NULL, NULL, &pAS->hcred,
&pAS->hcredLifeTime);
#if SSP_DEBUG
fprintf(stderr, "AcquireCredentialsHandle returned: %x\n", SecurityStatus);
#endif
if (SecurityStatus < 0) {
#if SSP_DEBUG
fprintf(stderr, "AcquireCredentialsHandle failed: %x\n", SecurityStatus);
#endif
return FALSE;
}
pAS->fHaveCredHandle = TRUE;
}
/* Prepare output buffer */
sbdOut.ulVersion = 0;
sbdOut.cBuffers = 1;
sbdOut.pBuffers = &sbOut;
sbOut.cbBuffer = *pcbOut;
sbOut.BufferType = SECBUFFER_TOKEN;
sbOut.pvBuffer = pOut;
/* Prepare input buffer */
sbdIn.ulVersion = 0;
sbdIn.cBuffers = 1;
sbdIn.pBuffers = &sbIn;
sbIn.cbBuffer = cbIn;
sbIn.BufferType = SECBUFFER_TOKEN;
sbIn.pvBuffer = pIn;
SecurityStatus = _AcceptSecurityContext(&pAS->hcred,
pAS->fInitialized ? &pAS->hctxt : NULL, &sbdIn, (NTLM_mode == SSP_NTLM) ? ASC_REQ_DELEGATE : 0,
SECURITY_NATIVE_DREP, &pAS->hctxt, &sbdOut, &fContextAttr,
&pAS->hctxtLifeTime);
#if SSP_DEBUG
fprintf(stderr, "AcceptSecurityContext returned: %x\n", SecurityStatus);
#endif
if (SecurityStatus < 0) {
#if SSP_DEBUG
fprintf(stderr, "AcceptSecurityContext failed: %x\n", SecurityStatus);
#endif
return FALSE;
}
pAS->fHaveCtxtHandle = TRUE;
/* If necessary, complete token */
if (SecurityStatus == SEC_I_COMPLETE_NEEDED || SecurityStatus == SEC_I_COMPLETE_AND_CONTINUE) {
SecurityStatus = _CompleteAuthToken(&pAS->hctxt, &sbdOut);
#if SSP_DEBUG
fprintf(stderr, "CompleteAuthToken returned: %x\n", SecurityStatus);
#endif
if (SecurityStatus < 0) {
#if SSP_DEBUG
fprintf(stderr, "CompleteAuthToken failed: %x\n", SecurityStatus);
#endif
return FALSE;
}
}
if ((credentials != NULL) &&
!(SecurityStatus == SEC_I_CONTINUE_NEEDED || SecurityStatus == SEC_I_COMPLETE_AND_CONTINUE)) {
SecurityStatus = _QueryContextAttributes(&pAS->hctxt, SECPKG_ATTR_NAMES, &namebuffer);
#if SSP_DEBUG
fprintf(stderr, "QueryContextAttributes returned: %x\n", SecurityStatus);
#endif
if (SecurityStatus < 0) {
#if SSP_DEBUG
fprintf(stderr, "QueryContextAttributes failed: %x\n", SecurityStatus);
#endif
return FALSE;
}
strncpy(credentials, namebuffer.sUserName, SSP_MAX_CRED_LEN);
}
*pcbOut = sbOut.cbBuffer;
if (!pAS->fInitialized)
pAS->fInitialized = TRUE;
*pfDone = !(SecurityStatus == SEC_I_CONTINUE_NEEDED
|| SecurityStatus == SEC_I_COMPLETE_AND_CONTINUE);
return TRUE;
}
BOOL WINAPI
SSP_LogonUser(PTSTR szUser, PTSTR szPassword, PTSTR szDomain)
{
AUTH_SEQ asServer =
{0};
AUTH_SEQ asClient =
{0};
BOOL fDone = FALSE;
BOOL fResult = FALSE;
DWORD cbOut = 0;
DWORD cbIn = 0;
SEC_WINNT_AUTH_IDENTITY ai;
do {
if (!hModule)
break;
/* Initialize auth identity structure */
ZeroMemory(&ai, sizeof(ai));
ai.Domain = szDomain;
ai.DomainLength = lstrlen(szDomain);
ai.User = szUser;
ai.UserLength = lstrlen(szUser);
ai.Password = szPassword;
ai.PasswordLength = lstrlen(szPassword);
#if defined(UNICODE) || defined(_UNICODE)
ai.Flags = SEC_WINNT_AUTH_IDENTITY_UNICODE;
#else
ai.Flags = SEC_WINNT_AUTH_IDENTITY_ANSI;
#endif
/* Prepare client message (negotiate) */
cbOut = cbMaxToken;
if (!GenClientContext(&asClient, &ai, NULL, 0, pClientBuf, &cbOut, &fDone))
break;
/* Prepare server message (challenge) */
cbIn = cbOut;
cbOut = cbMaxToken;
if (!GenServerContext(&asServer, pClientBuf, cbIn, pServerBuf, &cbOut,
&fDone, NULL))
break;
/* Most likely failure: AcceptServerContext fails with SEC_E_LOGON_DENIED
* in the case of bad szUser or szPassword.
* Unexpected Result: Logon will succeed if you pass in a bad szUser and
* the guest account is enabled in the specified domain.
*/
/* Prepare client message (authenticate) */
cbIn = cbOut;
cbOut = cbMaxToken;
if (!GenClientContext(&asClient, &ai, pServerBuf, cbIn, pClientBuf, &cbOut,
&fDone))
break;
/* Prepare server message (authentication) */
cbIn = cbOut;
cbOut = cbMaxToken;
if (!GenServerContext(&asServer, pClientBuf, cbIn, pServerBuf, &cbOut,
&fDone, NULL))
break;
fResult = TRUE;
} while (0);
/* Clean up resources */
if (asClient.fHaveCtxtHandle)
_DeleteSecurityContext(&asClient.hctxt);
if (asClient.fHaveCredHandle)
_FreeCredentialsHandle(&asClient.hcred);
if (asServer.fHaveCtxtHandle)
_DeleteSecurityContext(&asServer.hctxt);
if (asServer.fHaveCredHandle)
_FreeCredentialsHandle(&asServer.hcred);
return fResult;
}
const char *WINAPI
SSP_MakeChallenge(PVOID PNegotiateBuf, int NegotiateLen)
{
BOOL fDone = FALSE;
PVOID fResult = NULL;
DWORD cbOut = 0;
DWORD cbIn = 0;
ntlm_challenge *challenge;
const char *encoded = NULL;
if (NTLM_asServer.fHaveCtxtHandle)
_DeleteSecurityContext(&NTLM_asServer.hctxt);
if (NTLM_asServer.fHaveCredHandle)
_FreeCredentialsHandle(&NTLM_asServer.hcred);
NTLM_LocalCall = FALSE;
Use_Unicode = FALSE;
memcpy(pClientBuf, PNegotiateBuf, NegotiateLen);
ZeroMemory(pServerBuf, cbMaxToken);
ZeroMemory(&NTLM_asServer, sizeof(NTLM_asServer));
do {
if (!hModule)
break;
/* Prepare server message (challenge) */
cbIn = NegotiateLen;
cbOut = cbMaxToken;
if (!GenServerContext(&NTLM_asServer, pClientBuf, cbIn, pServerBuf, &cbOut,
&fDone, NULL))
break;
fResult = pServerBuf;
} while (0);
if (fResult != NULL) {
challenge = (ntlm_challenge *) fResult;
Use_Unicode = NEGOTIATE_UNICODE & challenge->flags;
NTLM_LocalCall = NEGOTIATE_THIS_IS_LOCAL_CALL & challenge->flags;
encoded = base64_encode_bin((char *) fResult, cbOut);
}
return encoded;
}
BOOL WINAPI
SSP_ValidateNTLMCredentials(PVOID PAutenticateBuf, int AutenticateLen, char *credentials)
{
BOOL fDone = FALSE;
BOOL fResult = FALSE;
DWORD cbOut = 0;
DWORD cbIn = 0;
memcpy(pClientBuf, PAutenticateBuf, AutenticateLen);
ZeroMemory(pServerBuf, cbMaxToken);
do {
if (!hModule)
break;
/* Prepare server message (authentication) */
cbIn = AutenticateLen;
cbOut = cbMaxToken;
if (!GenServerContext(&NTLM_asServer, pClientBuf, cbIn, pServerBuf, &cbOut,
&fDone, credentials))
break;
fResult = TRUE;
} while (0);
return fResult;
}
const char *WINAPI
SSP_MakeNegotiateBlob(PVOID PNegotiateBuf, int NegotiateLen, PBOOL fDone, int *Status, char *credentials)
{
DWORD cbOut = 0;
DWORD cbIn = 0;
const char *encoded = NULL;
if (NTLM_asServer.fHaveCtxtHandle)
_DeleteSecurityContext(&NTLM_asServer.hctxt);
if (NTLM_asServer.fHaveCredHandle)
_FreeCredentialsHandle(&NTLM_asServer.hcred);
memcpy(pClientBuf, PNegotiateBuf, NegotiateLen);
ZeroMemory(pServerBuf, cbMaxToken);
ZeroMemory(&NTLM_asServer, sizeof(NTLM_asServer));
do {
if (!hModule)
break;
/* Prepare server message (challenge) */
cbIn = NegotiateLen;
cbOut = cbMaxToken;
if (!GenServerContext(&NTLM_asServer, pClientBuf, cbIn, pServerBuf, &cbOut,
fDone, credentials)) {
*Status = SSP_ERROR;
break;
}
*Status = SSP_OK;
} while (0);
if (pServerBuf != NULL && cbOut > 0)
encoded = base64_encode_bin((char *) pServerBuf, cbOut);
return encoded;
}
const char *WINAPI
SSP_ValidateNegotiateCredentials(PVOID PAutenticateBuf, int AutenticateLen, PBOOL fDone, int *Status, char *credentials)
{
DWORD cbOut = 0;
DWORD cbIn = 0;
const char *encoded = NULL;
memcpy(pClientBuf, PAutenticateBuf, AutenticateLen);
ZeroMemory(pServerBuf, cbMaxToken);
do {
if (!hModule)
break;
/* Prepare server message (authentication) */
cbIn = AutenticateLen;
cbOut = cbMaxToken;
if (!GenServerContext(&NTLM_asServer, pClientBuf, cbIn, pServerBuf, &cbOut,
fDone, credentials)) {
*Status = SSP_ERROR;
break;
}
*Status = SSP_OK;
} while (0);
if (pServerBuf != NULL && cbOut > 0)
encoded = base64_encode_bin((char *) pServerBuf, cbOut);
return encoded;
}