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gecko-dev/extensions/auth/nsAuthSSPI.cpp

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/* vim:set ts=4 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//
// 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 "nsDNSService2.h"
#include "nsIServiceManager.h"
#include "nsIDNSService.h"
#include "nsIDNSRecord.h"
#include "nsMemory.h"
#include "nsNetCID.h"
#include "nsCOMPtr.h"
#include "nsICryptoHash.h"
#include "mozilla/Telemetry.h"
#include <windows.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 wchar_t* const pTypeName[] = {L"Kerberos", L"Negotiate", L"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 PSecurityFunctionTableW sspi;
static nsresult InitSSPI() {
LOG((" InitSSPI\n"));
sspi = InitSecurityInterfaceW();
if (!sspi) {
LOG(("InitSecurityInterfaceW failed"));
return NS_ERROR_UNEXPECTED;
}
return NS_OK;
}
//-----------------------------------------------------------------------------
nsresult nsAuthSSPI::MakeSN(const char* principal, nsCString& result) {
nsresult rv;
nsAutoCString 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.
int32_t index = buf.FindChar('@');
if (index == kNotFound) return NS_ERROR_UNEXPECTED;
nsCOMPtr<nsIDNSService> dnsService =
do_GetService(NS_DNSSERVICE_CONTRACTID, &rv);
if (NS_FAILED(rv)) return rv;
auto dns = static_cast<nsDNSService*>(dnsService.get());
// 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;
mozilla::OriginAttributes attrs;
rv = dns->DeprecatedSyncResolve(Substring(buf, index + 1),
nsIDNSService::RESOLVE_CANONICAL_NAME, attrs,
getter_AddRefs(record));
if (NS_FAILED(rv)) return rv;
nsAutoCString 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),
mCertDERData(nullptr),
mCertDERLength(0) {
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() {
mIsFirst = true;
if (mCertDERData) {
free(mCertDERData);
mCertDERData = nullptr;
mCertDERLength = 0;
}
if (mCtxt.dwLower || mCtxt.dwUpper) {
(sspi->DeleteSecurityContext)(&mCtxt);
memset(&mCtxt, 0, sizeof(mCtxt));
}
}
NS_IMPL_ISUPPORTS(nsAuthSSPI, nsIAuthModule)
NS_IMETHODIMP
nsAuthSSPI::Init(const char* serviceName, uint32_t serviceFlags,
const char16_t* domain, const char16_t* username,
const char16_t* password) {
LOG((" nsAuthSSPI::Init\n"));
mIsFirst = true;
mCertDERLength = 0;
mCertDERData = nullptr;
// The caller must supply a service name to be used. (For why we now require
// a service name for NTLM, see bug 487872.)
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_WCHAR* package;
package = (SEC_WCHAR*)pTypeName[(int)mPackage];
if (mPackage == PACKAGE_TYPE_NTLM) {
// (bug 535193) For NTLM, just use the uri host, do not do canonical host
// lookups. The incoming serviceName is in the format: "protocol@hostname",
// SSPI expects
// "<service class>/<hostname>", so swap the '@' for a '/'.
mServiceName.Assign(serviceName);
int32_t index = mServiceName.FindChar('@');
if (index == kNotFound) return NS_ERROR_UNEXPECTED;
mServiceName.Replace(index, 1, '/');
} else {
// Kerberos requires the canonical host, MakeSN takes care of this through a
// DNS lookup.
rv = MakeSN(serviceName, mServiceName);
if (NS_FAILED(rv)) return rv;
}
mServiceFlags = serviceFlags;
SECURITY_STATUS rc;
PSecPkgInfoW pinfo;
rc = (sspi->QuerySecurityPackageInfoW)(package, &pinfo);
if (rc != SEC_E_OK) {
LOG(("%s package not found\n", package));
return NS_ERROR_UNEXPECTED;
}
mMaxTokenLen = pinfo->cbMaxToken;
(sspi->FreeContextBuffer)(pinfo);
MS_TimeStamp useBefore;
SEC_WINNT_AUTH_IDENTITY_W ai;
SEC_WINNT_AUTH_IDENTITY_W* pai = nullptr;
// domain, username, and password will be null if nsHttpNTLMAuth's
// ChallengeReceived returns false for identityInvalid. Use default
// credentials in this case by passing null for pai.
if (username && password) {
// Keep a copy of these strings for the duration
mUsername.Assign(username);
mPassword.Assign(password);
mDomain.Assign(domain);
ai.Domain = reinterpret_cast<unsigned short*>(mDomain.BeginWriting());
ai.DomainLength = mDomain.Length();
ai.User = reinterpret_cast<unsigned short*>(mUsername.BeginWriting());
ai.UserLength = mUsername.Length();
ai.Password = reinterpret_cast<unsigned short*>(mPassword.BeginWriting());
ai.PasswordLength = mPassword.Length();
ai.Flags = SEC_WINNT_AUTH_IDENTITY_UNICODE;
pai = &ai;
}
rc = (sspi->AcquireCredentialsHandleW)(nullptr, package, SECPKG_CRED_OUTBOUND,
nullptr, pai, nullptr, nullptr, &mCred,
&useBefore);
if (rc != SEC_E_OK) return NS_ERROR_UNEXPECTED;
static bool sTelemetrySent = false;
if (!sTelemetrySent) {
mozilla::Telemetry::Accumulate(mozilla::Telemetry::NTLM_MODULE_USED_2,
serviceFlags & nsIAuthModule::REQ_PROXY_AUTH
? NTLM_MODULE_WIN_API_PROXY
: NTLM_MODULE_WIN_API_DIRECT);
sTelemetrySent = true;
}
LOG(("AcquireCredentialsHandle() succeeded.\n"));
return NS_OK;
}
// The arguments inToken and inTokenLen are used to pass in the server
// certificate (when available) in the first call of the function. The
// second time these arguments hold an input token.
NS_IMETHODIMP
nsAuthSSPI::GetNextToken(const void* inToken, uint32_t inTokenLen,
void** outToken, uint32_t* outTokenLen) {
// String for end-point bindings.
const char end_point[] = "tls-server-end-point:";
const int end_point_length = sizeof(end_point) - 1;
const int hash_size = 32; // Size of a SHA256 hash.
const int cbt_size = hash_size + end_point_length;
SECURITY_STATUS rc;
MS_TimeStamp ignored;
DWORD ctxAttr, ctxReq = 0;
CtxtHandle* ctxIn;
SecBufferDesc ibd, obd;
// Optional second input buffer for the CBT (Channel Binding Token)
SecBuffer ib[2], ob;
// Pointer to the block of memory that stores the CBT
char* sspi_cbt = nullptr;
SEC_CHANNEL_BINDINGS pendpoint_binding;
LOG(("entering nsAuthSSPI::GetNextToken()\n"));
if (!mCred.dwLower && !mCred.dwUpper) {
LOG(("nsAuthSSPI::GetNextToken(), not initialized. exiting."));
return NS_ERROR_NOT_INITIALIZED;
}
if (mServiceFlags & REQ_DELEGATE) ctxReq |= ISC_REQ_DELEGATE;
if (mServiceFlags & REQ_MUTUAL_AUTH) ctxReq |= ISC_REQ_MUTUAL_AUTH;
if (inToken) {
if (mIsFirst) {
// First time if it comes with a token,
// the token represents the server certificate.
mIsFirst = false;
mCertDERLength = inTokenLen;
mCertDERData = moz_xmalloc(inTokenLen);
memcpy(mCertDERData, inToken, inTokenLen);
// 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 = nullptr;
// The certificate needs to be erased before being passed
// to InitializeSecurityContextW().
inToken = nullptr;
inTokenLen = 0;
} else {
ibd.ulVersion = SECBUFFER_VERSION;
ibd.cBuffers = 0;
ibd.pBuffers = ib;
// If we have stored a certificate, the Channel Binding Token
// needs to be generated and sent in the first input buffer.
if (mCertDERLength > 0) {
// First we create a proper Endpoint Binding structure.
pendpoint_binding.dwInitiatorAddrType = 0;
pendpoint_binding.cbInitiatorLength = 0;
pendpoint_binding.dwInitiatorOffset = 0;
pendpoint_binding.dwAcceptorAddrType = 0;
pendpoint_binding.cbAcceptorLength = 0;
pendpoint_binding.dwAcceptorOffset = 0;
pendpoint_binding.cbApplicationDataLength = cbt_size;
pendpoint_binding.dwApplicationDataOffset =
sizeof(SEC_CHANNEL_BINDINGS);
// Then add it to the array of sec buffers accordingly.
ib[ibd.cBuffers].BufferType = SECBUFFER_CHANNEL_BINDINGS;
ib[ibd.cBuffers].cbBuffer = pendpoint_binding.cbApplicationDataLength +
pendpoint_binding.dwApplicationDataOffset;
sspi_cbt = (char*)moz_xmalloc(ib[ibd.cBuffers].cbBuffer);
// Helper to write in the memory block that stores the CBT
char* sspi_cbt_ptr = sspi_cbt;
ib[ibd.cBuffers].pvBuffer = sspi_cbt;
ibd.cBuffers++;
memcpy(sspi_cbt_ptr, &pendpoint_binding,
pendpoint_binding.dwApplicationDataOffset);
sspi_cbt_ptr += pendpoint_binding.dwApplicationDataOffset;
memcpy(sspi_cbt_ptr, end_point, end_point_length);
sspi_cbt_ptr += end_point_length;
// Start hashing. We are always doing SHA256, but depending
// on the certificate, a different alogirthm might be needed.
nsAutoCString hashString;
nsresult rv;
nsCOMPtr<nsICryptoHash> crypto;
crypto = do_CreateInstance(NS_CRYPTO_HASH_CONTRACTID, &rv);
if (NS_SUCCEEDED(rv)) rv = crypto->Init(nsICryptoHash::SHA256);
if (NS_SUCCEEDED(rv))
rv = crypto->Update((unsigned char*)mCertDERData, mCertDERLength);
if (NS_SUCCEEDED(rv)) rv = crypto->Finish(false, hashString);
if (NS_FAILED(rv)) {
free(mCertDERData);
mCertDERData = nullptr;
mCertDERLength = 0;
free(sspi_cbt);
return rv;
}
// Once the hash has been computed, we store it in memory right
// after the Endpoint structure and the "tls-server-end-point:"
// char array.
memcpy(sspi_cbt_ptr, hashString.get(), hash_size);
// Free memory used to store the server certificate
free(mCertDERData);
mCertDERData = nullptr;
mCertDERLength = 0;
} // End of CBT computation.
// We always need this SECBUFFER.
ib[ibd.cBuffers].BufferType = SECBUFFER_TOKEN;
ib[ibd.cBuffers].cbBuffer = inTokenLen;
ib[ibd.cBuffers].pvBuffer = (void*)inToken;
ibd.cBuffers++;
ctxIn = &mCtxt;
}
} else { // First time and without a token (no server certificate)
// 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 || mCertDERData || mCertDERLength) {
LOG(("Cannot restart authentication sequence!"));
return NS_ERROR_UNEXPECTED;
}
ctxIn = nullptr;
mIsFirst = false;
}
obd.ulVersion = SECBUFFER_VERSION;
obd.cBuffers = 1;
obd.pBuffers = &ob;
ob.BufferType = SECBUFFER_TOKEN;
ob.cbBuffer = mMaxTokenLen;
ob.pvBuffer = moz_xmalloc(ob.cbBuffer);
memset(ob.pvBuffer, 0, ob.cbBuffer);
NS_ConvertUTF8toUTF16 wSN(mServiceName);
SEC_WCHAR* sn = (SEC_WCHAR*)wSN.get();
rc = (sspi->InitializeSecurityContextW)(
&mCred, ctxIn, sn, ctxReq, 0, SECURITY_NATIVE_DREP,
inToken ? &ibd : nullptr, 0, &mCtxt, &obd, &ctxAttr, &ignored);
if (rc == SEC_I_CONTINUE_NEEDED || rc == SEC_E_OK) {
if (rc == SEC_E_OK)
LOG(("InitializeSecurityContext: succeeded.\n"));
else
LOG(("InitializeSecurityContext: continue.\n"));
if (sspi_cbt) free(sspi_cbt);
if (!ob.cbBuffer) {
free(ob.pvBuffer);
ob.pvBuffer = nullptr;
}
*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();
free(ob.pvBuffer);
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsAuthSSPI::Unwrap(const void* inToken, uint32_t inTokenLen, void** outToken,
uint32_t* 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 = moz_xmalloc(ib[0].cbBuffer);
memcpy(ib[0].pvBuffer, inToken, inTokenLen);
// app data
ib[1].BufferType = SECBUFFER_DATA;
ib[1].cbBuffer = 0;
ib[1].pvBuffer = nullptr;
rc = (sspi->DecryptMessage)(&mCtxt, &ibd,
0, // no sequence numbers
nullptr);
if (SEC_SUCCESS(rc)) {
// check if ib[1].pvBuffer is really just ib[0].pvBuffer, in which
// case we can let the caller free it. Otherwise, we need to
// clone it, and free the original
if (ib[0].pvBuffer == ib[1].pvBuffer) {
*outToken = ib[1].pvBuffer;
} else {
*outToken = moz_xmemdup(ib[1].pvBuffer, ib[1].cbBuffer);
free(ib[0].pvBuffer);
}
*outTokenLen = ib[1].cbBuffer;
} else
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) free(ib[0].pvBuffer);
if (ib[1].pvBuffer) free(ib[1].pvBuffer);
if (ib[2].pvBuffer) free(ib[2].pvBuffer);
}
};
NS_IMETHODIMP
nsAuthSSPI::Wrap(const void* inToken, uint32_t inTokenLen, bool confidential,
void** outToken, uint32_t* outTokenLen) {
SECURITY_STATUS rc;
SecBufferDesc ibd;
secBuffers bufs;
SecPkgContext_Sizes sizes;
rc = (sspi->QueryContextAttributesW)(&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 = moz_xmalloc(sizes.cbSecurityTrailer);
// APP Data
bufs.ib[1].BufferType = SECBUFFER_DATA;
bufs.ib[1].pvBuffer = moz_xmalloc(inTokenLen);
bufs.ib[1].cbBuffer = inTokenLen;
memcpy(bufs.ib[1].pvBuffer, inToken, inTokenLen);
// SSPI
bufs.ib[2].BufferType = SECBUFFER_PADDING;
bufs.ib[2].cbBuffer = sizes.cbBlockSize;
bufs.ib[2].pvBuffer = moz_xmalloc(bufs.ib[2].cbBuffer);
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*)moz_xmalloc(len);
*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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