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/* vim:set ts=4 sw=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/. */
#include "nsAuth.h"
#include "nsAuthSambaNTLM.h"
#include "nsMemory.h"
#include "nspr.h"
#include "prenv.h"
#include "plbase64.h"
#include "prerror.h"
#include "mozilla/Telemetry.h"
#include <stdlib.h>
nsAuthSambaNTLM::nsAuthSambaNTLM()
: mInitialMessage(nullptr),
mChildPID(nullptr),
mFromChildFD(nullptr),
mToChildFD(nullptr) {}
nsAuthSambaNTLM::~nsAuthSambaNTLM() {
// ntlm_auth reads from stdin regularly so closing our file handles
// should cause it to exit.
Shutdown();
PR_Free(mInitialMessage);
}
void nsAuthSambaNTLM::Shutdown() {
if (mFromChildFD) {
PR_Close(mFromChildFD);
mFromChildFD = nullptr;
}
if (mToChildFD) {
PR_Close(mToChildFD);
mToChildFD = nullptr;
}
if (mChildPID) {
PR_KillProcess(mChildPID);
mChildPID = nullptr;
}
}
NS_IMPL_ISUPPORTS(nsAuthSambaNTLM, nsIAuthModule)
static bool SpawnIOChild(char* const* aArgs, PRProcess** aPID,
PRFileDesc** aFromChildFD, PRFileDesc** aToChildFD) {
PRFileDesc* toChildPipeRead;
PRFileDesc* toChildPipeWrite;
if (PR_CreatePipe(&toChildPipeRead, &toChildPipeWrite) != PR_SUCCESS) {
return false;
}
PR_SetFDInheritable(toChildPipeRead, true);
PR_SetFDInheritable(toChildPipeWrite, false);
PRFileDesc* fromChildPipeRead;
PRFileDesc* fromChildPipeWrite;
if (PR_CreatePipe(&fromChildPipeRead, &fromChildPipeWrite) != PR_SUCCESS) {
PR_Close(toChildPipeRead);
PR_Close(toChildPipeWrite);
return false;
}
PR_SetFDInheritable(fromChildPipeRead, false);
PR_SetFDInheritable(fromChildPipeWrite, true);
PRProcessAttr* attr = PR_NewProcessAttr();
if (!attr) {
PR_Close(fromChildPipeRead);
PR_Close(fromChildPipeWrite);
PR_Close(toChildPipeRead);
PR_Close(toChildPipeWrite);
return false;
}
PR_ProcessAttrSetStdioRedirect(attr, PR_StandardInput, toChildPipeRead);
PR_ProcessAttrSetStdioRedirect(attr, PR_StandardOutput, fromChildPipeWrite);
PRProcess* process = PR_CreateProcess(aArgs[0], aArgs, nullptr, attr);
PR_DestroyProcessAttr(attr);
PR_Close(fromChildPipeWrite);
PR_Close(toChildPipeRead);
if (!process) {
LOG(("ntlm_auth exec failure [%d]", PR_GetError()));
PR_Close(fromChildPipeRead);
PR_Close(toChildPipeWrite);
return false;
}
*aPID = process;
*aFromChildFD = fromChildPipeRead;
*aToChildFD = toChildPipeWrite;
return true;
}
static bool WriteString(PRFileDesc* aFD, const nsACString& aString) {
int32_t length = aString.Length();
const char* s = aString.BeginReading();
LOG(("Writing to ntlm_auth: %s", s));
while (length > 0) {
int result = PR_Write(aFD, s, length);
if (result <= 0) return false;
s += result;
length -= result;
}
return true;
}
static bool ReadLine(PRFileDesc* aFD, nsACString& aString) {
// ntlm_auth is defined to only send one line in response to each of our
// input lines. So this simple unbuffered strategy works as long as we
// read the response immediately after sending one request.
aString.Truncate();
for (;;) {
char buf[1024];
int result = PR_Read(aFD, buf, sizeof(buf));
if (result <= 0) return false;
aString.Append(buf, result);
if (buf[result - 1] == '\n') {
LOG(("Read from ntlm_auth: %s", nsPromiseFlatCString(aString).get()));
return true;
}
}
}
/**
* Returns a heap-allocated array of PRUint8s, and stores the length in aLen.
* Returns nullptr if there's an error of any kind.
*/
static uint8_t* ExtractMessage(const nsACString& aLine, uint32_t* aLen) {
// ntlm_auth sends blobs to us as base64-encoded strings after the "xx "
// preamble on the response line.
int32_t length = aLine.Length();
// The caller should verify there is a valid "xx " prefix and the line
// is terminated with a \n
NS_ASSERTION(length >= 4, "Line too short...");
const char* line = aLine.BeginReading();
const char* s = line + 3;
length -= 4; // lose first 3 chars plus trailing \n
NS_ASSERTION(s[length] == '\n', "aLine not newline-terminated");
if (length & 3) {
// The base64 encoded block must be multiple of 4. If not, something
// screwed up.
NS_WARNING("Base64 encoded block should be a multiple of 4 chars");
return nullptr;
}
// Calculate the exact length. I wonder why there isn't a function for this
// in plbase64.
int32_t numEquals;
for (numEquals = 0; numEquals < length; ++numEquals) {
if (s[length - 1 - numEquals] != '=') break;
}
*aLen = (length / 4) * 3 - numEquals;
return reinterpret_cast<uint8_t*>(PL_Base64Decode(s, length, nullptr));
}
nsresult nsAuthSambaNTLM::SpawnNTLMAuthHelper() {
const char* username = PR_GetEnv("USER");
if (!username) return NS_ERROR_FAILURE;
const char* const args[] = {"ntlm_auth",
"--helper-protocol",
"ntlmssp-client-1",
"--use-cached-creds",
"--username",
username,
nullptr};
bool isOK = SpawnIOChild(const_cast<char* const*>(args), &mChildPID,
&mFromChildFD, &mToChildFD);
if (!isOK) return NS_ERROR_FAILURE;
if (!WriteString(mToChildFD, "YR\n"_ns)) return NS_ERROR_FAILURE;
nsCString line;
if (!ReadLine(mFromChildFD, line)) return NS_ERROR_FAILURE;
if (!StringBeginsWith(line, "YR "_ns)) {
// Something went wrong. Perhaps no credentials are accessible.
return NS_ERROR_FAILURE;
}
// It gave us an initial client-to-server request packet. Save that
// because we'll need it later.
mInitialMessage = ExtractMessage(line, &mInitialMessageLen);
if (!mInitialMessage) return NS_ERROR_FAILURE;
return NS_OK;
}
NS_IMETHODIMP
nsAuthSambaNTLM::Init(const nsACString& serviceName, uint32_t serviceFlags,
const nsAString& domain, const nsAString& username,
const nsAString& password) {
NS_ASSERTION(username.IsEmpty() && domain.IsEmpty() && password.IsEmpty(),
"unexpected credentials");
static bool sTelemetrySent = false;
if (!sTelemetrySent) {
mozilla::Telemetry::Accumulate(mozilla::Telemetry::NTLM_MODULE_USED_2,
serviceFlags & nsIAuthModule::REQ_PROXY_AUTH
? NTLM_MODULE_SAMBA_AUTH_PROXY
: NTLM_MODULE_SAMBA_AUTH_DIRECT);
sTelemetrySent = true;
}
return NS_OK;
}
NS_IMETHODIMP
nsAuthSambaNTLM::GetNextToken(const void* inToken, uint32_t inTokenLen,
void** outToken, uint32_t* outTokenLen) {
if (!inToken) {
/* someone wants our initial message */
*outToken = moz_xmemdup(mInitialMessage, mInitialMessageLen);
*outTokenLen = mInitialMessageLen;
return NS_OK;
}
/* inToken must be a type 2 message. Get ntlm_auth to generate our response */
char* encoded =
PL_Base64Encode(static_cast<const char*>(inToken), inTokenLen, nullptr);
if (!encoded) return NS_ERROR_OUT_OF_MEMORY;
nsCString request;
request.AssignLiteral("TT ");
request.Append(encoded);
PR_Free(encoded);
request.Append('\n');
if (!WriteString(mToChildFD, request)) return NS_ERROR_FAILURE;
nsCString line;
if (!ReadLine(mFromChildFD, line)) return NS_ERROR_FAILURE;
if (!StringBeginsWith(line, "KK "_ns) && !StringBeginsWith(line, "AF "_ns)) {
// Something went wrong. Perhaps no credentials are accessible.
return NS_ERROR_FAILURE;
}
uint8_t* buf = ExtractMessage(line, outTokenLen);
if (!buf) return NS_ERROR_FAILURE;
*outToken = moz_xmemdup(buf, *outTokenLen);
PR_Free(buf);
// We're done. Close our file descriptors now and reap the helper
// process.
Shutdown();
return NS_SUCCESS_AUTH_FINISHED;
}
NS_IMETHODIMP
nsAuthSambaNTLM::Unwrap(const void* inToken, uint32_t inTokenLen,
void** outToken, uint32_t* outTokenLen) {
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsAuthSambaNTLM::Wrap(const void* inToken, uint32_t inTokenLen,
bool confidential, void** outToken,
uint32_t* outTokenLen) {
return NS_ERROR_NOT_IMPLEMENTED;
}