/* vim:set ts=4 sw=4 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/. */

#include "nsComponentManagerUtils.h"

#include "nsNativeCharsetUtils.h"

#include "nsIServiceManager.h"

#include "nsIPrefService.h"

#include "nsAuthSASL.h"

static const char kNegotiateAuthSSPI[] = "network.auth.use-sspi";

nsAuthSASL::nsAuthSASL()

{

    mSASLReady = false;

}

void nsAuthSASL::Reset()

{

    mSASLReady = false;

}

/* Limitations apply to this class's thread safety. See the header file */

NS_IMPL_ISUPPORTS(nsAuthSASL, nsIAuthModule)

NS_IMETHODIMP

nsAuthSASL::Init(const char *serviceName,

                 uint32_t    serviceFlags,

                 const char16_t *domain,

                 const char16_t *username,

                 const char16_t *password)

{

    nsresult rv;

    NS_ASSERTION(username, "SASL requires a username");

    NS_ASSERTION(!domain && !password, "unexpected credentials");

    mUsername = username;

    // If we're doing SASL, we should do mutual auth

    serviceFlags |= REQ_MUTUAL_AUTH;

    // Find out whether we should be trying SSPI or not

    const char *contractID = NS_AUTH_MODULE_CONTRACTID_PREFIX "kerb-gss";

    nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);

    if (prefs) {

        bool val;

        rv = prefs->GetBoolPref(kNegotiateAuthSSPI, &val);

        if (NS_SUCCEEDED(rv) && val)

            contractID = NS_AUTH_MODULE_CONTRACTID_PREFIX "kerb-sspi";

    }

    mInnerModule = do_CreateInstance(contractID, &rv);

    // if we can't create the GSSAPI module, then bail

    NS_ENSURE_SUCCESS(rv, rv);

    mInnerModule->Init(serviceName, serviceFlags, nullptr, nullptr, nullptr);

    return NS_OK;

}

NS_IMETHODIMP

nsAuthSASL::GetNextToken(const void *inToken,

                         uint32_t    inTokenLen,

                         void      **outToken,

                         uint32_t   *outTokenLen)

{

    nsresult rv;

    void *unwrappedToken;

    char *message;

    uint32_t unwrappedTokenLen, messageLen;

    nsAutoCString userbuf;

    if (!mInnerModule)

        return NS_ERROR_NOT_INITIALIZED;

    if (mSASLReady) {

        // If the server COMPLETEs with an empty token, Cyrus sends us that token.

        // I don't think this is correct, but we need to handle that behaviour.

        // Cyrus ignores the contents of our reply token.

        if (inTokenLen == 0) {

            *outToken = nullptr;

            *outTokenLen = 0;

            return NS_OK;

        }

        // We've completed the GSSAPI portion of the handshake, and are

        // now ready to do the SASL security layer and authzid negotiation

        // Input packet from the server needs to be unwrapped.

        rv = mInnerModule->Unwrap(inToken, inTokenLen, &unwrappedToken,

                                  &unwrappedTokenLen);

        if (NS_FAILED(rv)) {

            Reset();

            return rv;

        }

        // If we were doing security layers then we'd care what the

        // server had sent us. We're not, so all we had to do was make

        // sure that the signature was correct with the above unwrap()

        free(unwrappedToken);

        NS_CopyUnicodeToNative(mUsername, userbuf);

        messageLen = userbuf.Length() + 4 + 1;

        message = (char *)moz_xmalloc(messageLen);

        message[0] = 0x01; // No security layer

        message[1] = 0x00;

        message[2] = 0x00;

        message[3] = 0x00; // Maxbuf must be zero if we've got no sec layer

        strcpy(message+4, userbuf.get());

        // Userbuf should not be nullptr terminated, so trim the trailing nullptr

        // when wrapping the message

        rv = mInnerModule->Wrap((void *) message, messageLen-1, false,

                                outToken, outTokenLen);

        free(message);

        Reset(); // All done

        return NS_SUCCEEDED(rv) ? NS_SUCCESS_AUTH_FINISHED : rv;

    }

    rv = mInnerModule->GetNextToken(inToken, inTokenLen, outToken,

                                    outTokenLen);

    if (rv == NS_SUCCESS_AUTH_FINISHED) {

        mSASLReady = true;

        rv = NS_OK;

    }

    return rv;

}

NS_IMETHODIMP

nsAuthSASL::Unwrap(const void *inToken,

                   uint32_t    inTokenLen,

                   void      **outToken,

                   uint32_t   *outTokenLen)

{

    return NS_ERROR_NOT_IMPLEMENTED;

}

NS_IMETHODIMP

nsAuthSASL::Wrap(const void *inToken,

                 uint32_t    inTokenLen,

                 bool        confidential,

                 void      **outToken,

                 uint32_t   *outTokenLen)

{

    return NS_ERROR_NOT_IMPLEMENTED;

}