286 lines
8.6 KiB
C++
286 lines
8.6 KiB
C++
/* vim:set ts=4 sw=4 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsAuth.h"
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#include "nsAuthSambaNTLM.h"
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#include "nspr.h"
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#include "prenv.h"
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#include "plbase64.h"
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#include "prerror.h"
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#include <stdlib.h>
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nsAuthSambaNTLM::nsAuthSambaNTLM()
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: mInitialMessage(nullptr), mChildPID(nullptr), mFromChildFD(nullptr),
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mToChildFD(nullptr)
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{
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}
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nsAuthSambaNTLM::~nsAuthSambaNTLM()
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{
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// ntlm_auth reads from stdin regularly so closing our file handles
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// should cause it to exit.
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Shutdown();
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PR_Free(mInitialMessage);
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}
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void
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nsAuthSambaNTLM::Shutdown()
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{
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if (mFromChildFD) {
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PR_Close(mFromChildFD);
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mFromChildFD = nullptr;
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}
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if (mToChildFD) {
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PR_Close(mToChildFD);
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mToChildFD = nullptr;
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}
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if (mChildPID) {
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int32_t exitCode;
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PR_WaitProcess(mChildPID, &exitCode);
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mChildPID = nullptr;
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}
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}
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NS_IMPL_ISUPPORTS(nsAuthSambaNTLM, nsIAuthModule)
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static bool
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SpawnIOChild(char* const* aArgs, PRProcess** aPID,
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PRFileDesc** aFromChildFD, PRFileDesc** aToChildFD)
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{
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PRFileDesc* toChildPipeRead;
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PRFileDesc* toChildPipeWrite;
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if (PR_CreatePipe(&toChildPipeRead, &toChildPipeWrite) != PR_SUCCESS)
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return false;
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PR_SetFDInheritable(toChildPipeRead, true);
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PR_SetFDInheritable(toChildPipeWrite, false);
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PRFileDesc* fromChildPipeRead;
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PRFileDesc* fromChildPipeWrite;
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if (PR_CreatePipe(&fromChildPipeRead, &fromChildPipeWrite) != PR_SUCCESS) {
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PR_Close(toChildPipeRead);
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PR_Close(toChildPipeWrite);
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return false;
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}
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PR_SetFDInheritable(fromChildPipeRead, false);
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PR_SetFDInheritable(fromChildPipeWrite, true);
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PRProcessAttr* attr = PR_NewProcessAttr();
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if (!attr) {
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PR_Close(fromChildPipeRead);
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PR_Close(fromChildPipeWrite);
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PR_Close(toChildPipeRead);
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PR_Close(toChildPipeWrite);
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return false;
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}
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PR_ProcessAttrSetStdioRedirect(attr, PR_StandardInput, toChildPipeRead);
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PR_ProcessAttrSetStdioRedirect(attr, PR_StandardOutput, fromChildPipeWrite);
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PRProcess* process = PR_CreateProcess(aArgs[0], aArgs, nullptr, attr);
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PR_DestroyProcessAttr(attr);
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PR_Close(fromChildPipeWrite);
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PR_Close(toChildPipeRead);
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if (!process) {
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LOG(("ntlm_auth exec failure [%d]", PR_GetError()));
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PR_Close(fromChildPipeRead);
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PR_Close(toChildPipeWrite);
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return false;
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}
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*aPID = process;
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*aFromChildFD = fromChildPipeRead;
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*aToChildFD = toChildPipeWrite;
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return true;
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}
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static bool WriteString(PRFileDesc* aFD, const nsACString& aString)
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{
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int32_t length = aString.Length();
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const char* s = aString.BeginReading();
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LOG(("Writing to ntlm_auth: %s", s));
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while (length > 0) {
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int result = PR_Write(aFD, s, length);
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if (result <= 0)
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return false;
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s += result;
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length -= result;
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}
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return true;
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}
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static bool ReadLine(PRFileDesc* aFD, nsACString& aString)
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{
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// ntlm_auth is defined to only send one line in response to each of our
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// input lines. So this simple unbuffered strategy works as long as we
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// read the response immediately after sending one request.
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aString.Truncate();
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for (;;) {
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char buf[1024];
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int result = PR_Read(aFD, buf, sizeof(buf));
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if (result <= 0)
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return false;
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aString.Append(buf, result);
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if (buf[result - 1] == '\n') {
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LOG(("Read from ntlm_auth: %s", nsPromiseFlatCString(aString).get()));
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return true;
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}
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}
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}
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/**
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* Returns a heap-allocated array of PRUint8s, and stores the length in aLen.
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* Returns nullptr if there's an error of any kind.
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*/
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static uint8_t* ExtractMessage(const nsACString& aLine, uint32_t* aLen)
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{
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// ntlm_auth sends blobs to us as base64-encoded strings after the "xx "
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// preamble on the response line.
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int32_t length = aLine.Length();
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// The caller should verify there is a valid "xx " prefix and the line
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// is terminated with a \n
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NS_ASSERTION(length >= 4, "Line too short...");
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const char* line = aLine.BeginReading();
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const char* s = line + 3;
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length -= 4; // lose first 3 chars plus trailing \n
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NS_ASSERTION(s[length] == '\n', "aLine not newline-terminated");
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if (length & 3) {
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// The base64 encoded block must be multiple of 4. If not, something
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// screwed up.
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NS_WARNING("Base64 encoded block should be a multiple of 4 chars");
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return nullptr;
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}
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// Calculate the exact length. I wonder why there isn't a function for this
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// in plbase64.
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int32_t numEquals;
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for (numEquals = 0; numEquals < length; ++numEquals) {
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if (s[length - 1 - numEquals] != '=')
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break;
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}
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*aLen = (length/4)*3 - numEquals;
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return reinterpret_cast<uint8_t*>(PL_Base64Decode(s, length, nullptr));
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}
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nsresult
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nsAuthSambaNTLM::SpawnNTLMAuthHelper()
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{
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const char* username = PR_GetEnv("USER");
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if (!username)
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return NS_ERROR_FAILURE;
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const char* const args[] = {
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"ntlm_auth",
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"--helper-protocol", "ntlmssp-client-1",
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"--use-cached-creds",
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"--username", username,
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nullptr
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};
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bool isOK = SpawnIOChild(const_cast<char* const*>(args), &mChildPID, &mFromChildFD, &mToChildFD);
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if (!isOK)
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return NS_ERROR_FAILURE;
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if (!WriteString(mToChildFD, NS_LITERAL_CSTRING("YR\n")))
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return NS_ERROR_FAILURE;
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nsCString line;
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if (!ReadLine(mFromChildFD, line))
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return NS_ERROR_FAILURE;
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if (!StringBeginsWith(line, NS_LITERAL_CSTRING("YR "))) {
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// Something went wrong. Perhaps no credentials are accessible.
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return NS_ERROR_FAILURE;
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}
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// It gave us an initial client-to-server request packet. Save that
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// because we'll need it later.
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mInitialMessage = ExtractMessage(line, &mInitialMessageLen);
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if (!mInitialMessage)
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return NS_ERROR_FAILURE;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsAuthSambaNTLM::Init(const char *serviceName,
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uint32_t serviceFlags,
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const char16_t *domain,
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const char16_t *username,
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const char16_t *password)
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{
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NS_ASSERTION(!username && !domain && !password, "unexpected credentials");
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return NS_OK;
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}
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NS_IMETHODIMP
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nsAuthSambaNTLM::GetNextToken(const void *inToken,
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uint32_t inTokenLen,
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void **outToken,
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uint32_t *outTokenLen)
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{
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if (!inToken) {
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/* someone wants our initial message */
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*outToken = nsMemory::Clone(mInitialMessage, mInitialMessageLen);
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if (!*outToken)
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return NS_ERROR_OUT_OF_MEMORY;
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*outTokenLen = mInitialMessageLen;
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return NS_OK;
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}
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/* inToken must be a type 2 message. Get ntlm_auth to generate our response */
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char* encoded = PL_Base64Encode(static_cast<const char*>(inToken), inTokenLen, nullptr);
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if (!encoded)
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return NS_ERROR_OUT_OF_MEMORY;
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nsCString request;
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request.AssignLiteral("TT ");
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request.Append(encoded);
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PR_Free(encoded);
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request.Append('\n');
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if (!WriteString(mToChildFD, request))
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return NS_ERROR_FAILURE;
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nsCString line;
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if (!ReadLine(mFromChildFD, line))
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return NS_ERROR_FAILURE;
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if (!StringBeginsWith(line, NS_LITERAL_CSTRING("KK ")) &&
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!StringBeginsWith(line, NS_LITERAL_CSTRING("AF "))) {
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// Something went wrong. Perhaps no credentials are accessible.
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return NS_ERROR_FAILURE;
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}
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uint8_t* buf = ExtractMessage(line, outTokenLen);
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if (!buf)
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return NS_ERROR_FAILURE;
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*outToken = nsMemory::Clone(buf, *outTokenLen);
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PR_Free(buf);
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if (!*outToken) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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// We're done. Close our file descriptors now and reap the helper
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// process.
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Shutdown();
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return NS_SUCCESS_AUTH_FINISHED;
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}
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NS_IMETHODIMP
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nsAuthSambaNTLM::Unwrap(const void *inToken,
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uint32_t inTokenLen,
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void **outToken,
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uint32_t *outTokenLen)
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{
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHODIMP
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nsAuthSambaNTLM::Wrap(const void *inToken,
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uint32_t inTokenLen,
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bool confidential,
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void **outToken,
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uint32_t *outTokenLen)
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{
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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