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gecko-dev/extensions/auth/nsAuthSSPI.cpp

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/* vim:set ts=4 sw=4 sts=4 et cindent: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the SSPI NegotiateAuth Module
*
* The Initial Developer of the Original Code is IBM Corporation.
* Portions created by the Initial Developer are Copyright (C) 2004
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Darin Fisher <darin@meer.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
//
// Negotiate Authentication Support Module
//
// Described by IETF Internet draft: draft-brezak-kerberos-http-00.txt
// (formerly draft-brezak-spnego-http-04.txt)
//
// Also described here:
// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnsecure/html/http-sso-1.asp
//
#include "nsAuthSSPI.h"
#include "nsIServiceManager.h"
#include "nsIDNSService.h"
#include "nsIDNSRecord.h"
#include "nsNetCID.h"
#include "nsCOMPtr.h"
#define SEC_SUCCESS(Status) ((Status) >= 0)
#ifndef KERB_WRAP_NO_ENCRYPT
#define KERB_WRAP_NO_ENCRYPT 0x80000001
#endif
#ifndef SECBUFFER_PADDING
#define SECBUFFER_PADDING 9
#endif
#ifndef SECBUFFER_STREAM
#define SECBUFFER_STREAM 10
#endif
//-----------------------------------------------------------------------------
static const char *const pTypeName [] = {
"Kerberos",
"Negotiate",
"NTLM"
};
#ifdef DEBUG
#define CASE_(_x) case _x: return # _x;
static const char *MapErrorCode(int rc)
{
switch (rc) {
CASE_(SEC_E_OK)
CASE_(SEC_I_CONTINUE_NEEDED)
CASE_(SEC_I_COMPLETE_NEEDED)
CASE_(SEC_I_COMPLETE_AND_CONTINUE)
CASE_(SEC_E_INCOMPLETE_MESSAGE)
CASE_(SEC_I_INCOMPLETE_CREDENTIALS)
CASE_(SEC_E_INVALID_HANDLE)
CASE_(SEC_E_TARGET_UNKNOWN)
CASE_(SEC_E_LOGON_DENIED)
CASE_(SEC_E_INTERNAL_ERROR)
CASE_(SEC_E_NO_CREDENTIALS)
CASE_(SEC_E_NO_AUTHENTICATING_AUTHORITY)
CASE_(SEC_E_INSUFFICIENT_MEMORY)
CASE_(SEC_E_INVALID_TOKEN)
}
return "<unknown>";
}
#else
#define MapErrorCode(_rc) ""
#endif
//-----------------------------------------------------------------------------
static HINSTANCE sspi_lib;
static PSecurityFunctionTable sspi;
static nsresult
InitSSPI()
{
PSecurityFunctionTable (*initFun)(void);
LOG((" InitSSPI\n"));
sspi_lib = LoadLibrary("secur32.dll");
if (!sspi_lib) {
sspi_lib = LoadLibrary("security.dll");
if (!sspi_lib) {
LOG(("SSPI library not found"));
return NS_ERROR_UNEXPECTED;
}
}
initFun = (PSecurityFunctionTable (*)(void))
GetProcAddress(sspi_lib, "InitSecurityInterfaceA");
if (!initFun) {
LOG(("InitSecurityInterfaceA not found"));
return NS_ERROR_UNEXPECTED;
}
sspi = initFun();
if (!sspi) {
LOG(("InitSecurityInterfaceA failed"));
return NS_ERROR_UNEXPECTED;
}
return NS_OK;
}
//-----------------------------------------------------------------------------
static nsresult
MakeSN(const char *principal, nsCString &result)
{
nsresult rv;
nsCAutoString buf(principal);
// The service name looks like "protocol@hostname", we need to map
// this to a value that SSPI expects. To be consistent with IE, we
// need to map '@' to '/' and canonicalize the hostname.
PRInt32 index = buf.FindChar('@');
if (index == kNotFound)
return NS_ERROR_UNEXPECTED;
nsCOMPtr<nsIDNSService> dns = do_GetService(NS_DNSSERVICE_CONTRACTID, &rv);
if (NS_FAILED(rv))
return rv;
// This could be expensive if our DNS cache cannot satisfy the request.
// However, we should have at least hit the OS resolver once prior to
// reaching this code, so provided the OS resolver has this information
// cached, we should not have to worry about blocking on this function call
// for very long. NOTE: because we ask for the canonical hostname, we
// might end up requiring extra network activity in cases where the OS
// resolver might not have enough information to satisfy the request from
// its cache. This is not an issue in versions of Windows up to WinXP.
nsCOMPtr<nsIDNSRecord> record;
rv = dns->Resolve(Substring(buf, index + 1),
nsIDNSService::RESOLVE_CANONICAL_NAME,
getter_AddRefs(record));
if (NS_FAILED(rv))
return rv;
nsCAutoString cname;
rv = record->GetCanonicalName(cname);
if (NS_SUCCEEDED(rv)) {
result = StringHead(buf, index) + NS_LITERAL_CSTRING("/") + cname;
LOG(("Using SPN of [%s]\n", result.get()));
}
return rv;
}
//-----------------------------------------------------------------------------
nsAuthSSPI::nsAuthSSPI(pType package)
: mServiceFlags(REQ_DEFAULT)
, mMaxTokenLen(0)
, mPackage(package)
{
memset(&mCred, 0, sizeof(mCred));
memset(&mCtxt, 0, sizeof(mCtxt));
}
nsAuthSSPI::~nsAuthSSPI()
{
Reset();
if (mCred.dwLower || mCred.dwUpper) {
#ifdef __MINGW32__
(sspi->FreeCredentialsHandle)(&mCred);
#else
(sspi->FreeCredentialHandle)(&mCred);
#endif
memset(&mCred, 0, sizeof(mCred));
}
}
void
nsAuthSSPI::Reset()
{
if (mCtxt.dwLower || mCtxt.dwUpper) {
(sspi->DeleteSecurityContext)(&mCtxt);
memset(&mCtxt, 0, sizeof(mCtxt));
}
}
NS_IMPL_ISUPPORTS1(nsAuthSSPI, nsIAuthModule)
NS_IMETHODIMP
nsAuthSSPI::Init(const char *serviceName,
PRUint32 serviceFlags,
const PRUnichar *domain,
const PRUnichar *username,
const PRUnichar *password)
{
LOG((" nsAuthSSPI::Init\n"));
// we don't expect to be passed any user credentials
NS_ASSERTION(!domain && !username && !password, "unexpected credentials");
// if we're configured for SPNEGO (Negotiate) or Kerberos, then it's critical
// that the caller supply a service name to be used.
if (mPackage != PACKAGE_TYPE_NTLM)
NS_ENSURE_TRUE(serviceName && *serviceName, NS_ERROR_INVALID_ARG);
nsresult rv;
// XXX lazy initialization like this assumes that we are single threaded
if (!sspi) {
rv = InitSSPI();
if (NS_FAILED(rv))
return rv;
}
SEC_CHAR *package;
package = (SEC_CHAR *) pTypeName[(int)mPackage];
if (mPackage != PACKAGE_TYPE_NTLM)
{
rv = MakeSN(serviceName, mServiceName);
if (NS_FAILED(rv))
return rv;
mServiceFlags = serviceFlags;
}
SECURITY_STATUS rc;
PSecPkgInfo pinfo;
rc = (sspi->QuerySecurityPackageInfo)(package, &pinfo);
if (rc != SEC_E_OK) {
LOG(("%s package not found\n", package));
return NS_ERROR_UNEXPECTED;
}
mMaxTokenLen = pinfo->cbMaxToken;
(sspi->FreeContextBuffer)(pinfo);
TimeStamp useBefore;
rc = (sspi->AcquireCredentialsHandle)(NULL,
package,
SECPKG_CRED_OUTBOUND,
NULL,
NULL,
NULL,
NULL,
&mCred,
&useBefore);
if (rc != SEC_E_OK)
return NS_ERROR_UNEXPECTED;
return NS_OK;
}
NS_IMETHODIMP
nsAuthSSPI::GetNextToken(const void *inToken,
PRUint32 inTokenLen,
void **outToken,
PRUint32 *outTokenLen)
{
SECURITY_STATUS rc;
TimeStamp ignored;
DWORD ctxAttr, ctxReq = 0;
CtxtHandle *ctxIn;
SecBufferDesc ibd, obd;
SecBuffer ib, ob;
LOG(("entering nsAuthSSPI::GetNextToken()\n"));
if (mServiceFlags & REQ_DELEGATE)
ctxReq |= ISC_REQ_DELEGATE;
if (mServiceFlags & REQ_MUTUAL_AUTH)
ctxReq |= ISC_REQ_MUTUAL_AUTH;
if (inToken) {
ib.BufferType = SECBUFFER_TOKEN;
ib.cbBuffer = inTokenLen;
ib.pvBuffer = (void *) inToken;
ibd.ulVersion = SECBUFFER_VERSION;
ibd.cBuffers = 1;
ibd.pBuffers = &ib;
ctxIn = &mCtxt;
}
else {
// If there is no input token, then we are starting a new
// authentication sequence. If we have already initialized our
// security context, then we're in trouble because it means that the
// first sequence failed. We need to bail or else we might end up in
// an infinite loop.
if (mCtxt.dwLower || mCtxt.dwUpper) {
LOG(("Cannot restart authentication sequence!"));
return NS_ERROR_UNEXPECTED;
}
ctxIn = NULL;
}
obd.ulVersion = SECBUFFER_VERSION;
obd.cBuffers = 1;
obd.pBuffers = &ob;
ob.BufferType = SECBUFFER_TOKEN;
ob.cbBuffer = mMaxTokenLen;
ob.pvBuffer = nsMemory::Alloc(ob.cbBuffer);
if (!ob.pvBuffer)
return NS_ERROR_OUT_OF_MEMORY;
memset(ob.pvBuffer, 0, ob.cbBuffer);
SEC_CHAR *sn;
if (mPackage == PACKAGE_TYPE_NTLM)
sn = NULL;
else
sn = (SEC_CHAR *) mServiceName.get();
rc = (sspi->InitializeSecurityContext)(&mCred,
ctxIn,
sn,
ctxReq,
0,
SECURITY_NATIVE_DREP,
inToken ? &ibd : NULL,
0,
&mCtxt,
&obd,
&ctxAttr,
&ignored);
if (rc == SEC_I_CONTINUE_NEEDED || rc == SEC_E_OK) {
if (!ob.cbBuffer) {
nsMemory::Free(ob.pvBuffer);
ob.pvBuffer = NULL;
}
*outToken = ob.pvBuffer;
*outTokenLen = ob.cbBuffer;
if (rc == SEC_E_OK)
return NS_SUCCESS_AUTH_FINISHED;
return NS_OK;
}
LOG(("InitializeSecurityContext failed [rc=%d:%s]\n", rc, MapErrorCode(rc)));
Reset();
nsMemory::Free(ob.pvBuffer);
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsAuthSSPI::Unwrap(const void *inToken,
PRUint32 inTokenLen,
void **outToken,
PRUint32 *outTokenLen)
{
SECURITY_STATUS rc;
SecBufferDesc ibd;
SecBuffer ib[2];
ibd.cBuffers = 2;
ibd.pBuffers = ib;
ibd.ulVersion = SECBUFFER_VERSION;
// SSPI Buf
ib[0].BufferType = SECBUFFER_STREAM;
ib[0].cbBuffer = inTokenLen;
ib[0].pvBuffer = nsMemory::Alloc(ib[0].cbBuffer);
if (!ib[0].pvBuffer)
return NS_ERROR_OUT_OF_MEMORY;
memcpy(ib[0].pvBuffer, inToken, inTokenLen);
// app data
ib[1].BufferType = SECBUFFER_DATA;
ib[1].cbBuffer = 0;
ib[1].pvBuffer = NULL;
rc = (sspi->DecryptMessage)(
&mCtxt,
&ibd,
0, // no sequence numbers
NULL
);
if (SEC_SUCCESS(rc)) {
*outToken = ib[1].pvBuffer;
*outTokenLen = ib[1].cbBuffer;
}
else
nsMemory::Free(ib[1].pvBuffer);
nsMemory::Free(ib[0].pvBuffer);
if (!SEC_SUCCESS(rc))
return NS_ERROR_FAILURE;
return NS_OK;
}
// utility class used to free memory on exit
class secBuffers
{
public:
SecBuffer ib[3];
secBuffers() { memset(&ib, 0, sizeof(ib)); }
~secBuffers()
{
if (ib[0].pvBuffer)
nsMemory::Free(ib[0].pvBuffer);
if (ib[1].pvBuffer)
nsMemory::Free(ib[1].pvBuffer);
if (ib[2].pvBuffer)
nsMemory::Free(ib[2].pvBuffer);
}
};
NS_IMETHODIMP
nsAuthSSPI::Wrap(const void *inToken,
PRUint32 inTokenLen,
PRBool confidential,
void **outToken,
PRUint32 *outTokenLen)
{
SECURITY_STATUS rc;
SecBufferDesc ibd;
secBuffers bufs;
SecPkgContext_Sizes sizes;
rc = (sspi->QueryContextAttributes)(
&mCtxt,
SECPKG_ATTR_SIZES,
&sizes);
if (!SEC_SUCCESS(rc))
return NS_ERROR_FAILURE;
ibd.cBuffers = 3;
ibd.pBuffers = bufs.ib;
ibd.ulVersion = SECBUFFER_VERSION;
// SSPI
bufs.ib[0].cbBuffer = sizes.cbSecurityTrailer;
bufs.ib[0].BufferType = SECBUFFER_TOKEN;
bufs.ib[0].pvBuffer = nsMemory::Alloc(sizes.cbSecurityTrailer);
if (!bufs.ib[0].pvBuffer)
return NS_ERROR_OUT_OF_MEMORY;
// APP Data
bufs.ib[1].BufferType = SECBUFFER_DATA;
bufs.ib[1].pvBuffer = nsMemory::Alloc(inTokenLen);
bufs.ib[1].cbBuffer = inTokenLen;
if (!bufs.ib[1].pvBuffer)
return NS_ERROR_OUT_OF_MEMORY;
memcpy(bufs.ib[1].pvBuffer, inToken, inTokenLen);
// SSPI
bufs.ib[2].BufferType = SECBUFFER_PADDING;
bufs.ib[2].cbBuffer = sizes.cbBlockSize;
bufs.ib[2].pvBuffer = nsMemory::Alloc(bufs.ib[2].cbBuffer);
if (!bufs.ib[2].pvBuffer)
return NS_ERROR_OUT_OF_MEMORY;
rc = (sspi->EncryptMessage)(&mCtxt,
confidential ? 0 : KERB_WRAP_NO_ENCRYPT,
&ibd, 0);
if (SEC_SUCCESS(rc)) {
int len = bufs.ib[0].cbBuffer + bufs.ib[1].cbBuffer + bufs.ib[2].cbBuffer;
char *p = (char *) nsMemory::Alloc(len);
if (!p)
return NS_ERROR_OUT_OF_MEMORY;
*outToken = (void *) p;
*outTokenLen = len;
memcpy(p, bufs.ib[0].pvBuffer, bufs.ib[0].cbBuffer);
p += bufs.ib[0].cbBuffer;
memcpy(p,bufs.ib[1].pvBuffer, bufs.ib[1].cbBuffer);
p += bufs.ib[1].cbBuffer;
memcpy(p,bufs.ib[2].pvBuffer, bufs.ib[2].cbBuffer);
return NS_OK;
}
return NS_ERROR_FAILURE;
}
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