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klib.cpp
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klib.cpp
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#include <algorithm>
#include <cstring>
#include <cstdlib>
#include <windows.h>
#include <wincred.h>
#include "klib.hpp"
namespace klib {
void sendToInputConsole(HANDLE hStdin, const char *inputMsg) {
const int msgLength = ::strlen(inputMsg);
INPUT_RECORD* irArray = new INPUT_RECORD[msgLength * 2];
for (size_t i = 0; i < msgLength; ++i) {
irArray[i * 2].EventType = KEY_EVENT;
irArray[i * 2].Event.KeyEvent.bKeyDown = TRUE;
irArray[i * 2].Event.KeyEvent.dwControlKeyState = 0;
irArray[i * 2].Event.KeyEvent.uChar.UnicodeChar = inputMsg[i];
irArray[i * 2].Event.KeyEvent.wRepeatCount = 1;
irArray[i * 2].Event.KeyEvent.wVirtualKeyCode = 0;
irArray[i * 2].Event.KeyEvent.wVirtualScanCode = 0;
irArray[i * 2 + 1] = irArray[i * 2];
irArray[i * 2 + 1].Event.KeyEvent.bKeyDown = FALSE;
}
// Write the input record to the console input buffer
DWORD eventsWritten;
if (!WriteConsoleInput(hStdin, irArray, msgLength * 2, &eventsWritten)) {
std::cerr << "WriteConsoleInput failed" << std::endl;
}
delete [] irArray;
}
char *getCredentialsFromManager(char *credName) {
char *result = NULL;
PCREDENTIALA pCred = NULL;
if (::CredReadA(credName, CRED_TYPE_GENERIC, 0, &pCred)) {
// in theory, we should work with a wide-char string
// std::wstring pwd(reinterpret_cast<wchar_t *>(pCred->CredentialBlob), pCred->CredentialBlobSize);
// std::wcerr << pwd << std::endl;
// in practice, we're butchers
result = (char *) malloc(pCred->CredentialBlobSize + 1);
int j = 0;
for (int i = 0; i < pCred->CredentialBlobSize; ++i) {
BYTE curByte = pCred->CredentialBlob[i];
if (curByte != 0) {
result[j++] = static_cast<char>(curByte);
}
}
result[j++] = 0;
}
return result;
}
char *getCredFromEnvironmentVariable(char *name) {
char *result = (char *) malloc(8 * sizeof(char));
DWORD valueLength = ::GetEnvironmentVariableA(name, result, 1);
if (valueLength != 0) {
free(result);
result = (char *) malloc((valueLength + 1) * sizeof(char));
valueLength = ::GetEnvironmentVariableA(name, result, valueLength);
if (valueLength == 0) {
free(result);
result = NULL;
}
} else {
free(result);
result = NULL;
}
return result;
}
char *getCredFromFile(const char *fileName) {
char *result = NULL;
HANDLE hFile = ::CreateFileA(fileName, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile != INVALID_HANDLE_VALUE) {
DWORD fileSize = ::GetFileSize(hFile, NULL);
if (fileSize != INVALID_FILE_SIZE) {
int bufSize = fileSize > 1024 ? fileSize : 1024;
result = new char[bufSize + 1];
::ZeroMemory(result, bufSize);
char ch;
DWORD bytesRead;
int curPos = 0;
while (::ReadFile(hFile, &ch, 1, &bytesRead, NULL) && bytesRead == 1 && curPos < bufSize && ch != '\n' && ch != '\r') {
result[curPos++] = ch;
}
if (curPos == 0) {
std::cerr << "Password line is empty!" << std::endl;
delete [] result;
result = NULL;
} else {
result[curPos++] = '\0';
}
}
::CloseHandle(hFile);
}
return result;
}
char *readPassword(KeyMode keyMode, char *additionalInfo) {
char *result = NULL;
DWORD dwAttrib = 0;
switch (keyMode) {
case KeyMode::CMDLINE_KEY:
result = additionalInfo; // password is on the cmd line itself
break;
case KeyMode::CRED_MAN:
result = getCredentialsFromManager(additionalInfo);
break;
case KeyMode::ENV_VAR:
result = getCredFromEnvironmentVariable(ENVVAR_NAME);
break;
case KeyMode::KEY_FILE:
dwAttrib = GetFileAttributesA(additionalInfo);
if (dwAttrib != INVALID_FILE_ATTRIBUTES && !(dwAttrib & FILE_ATTRIBUTE_DIRECTORY)) {
result = getCredFromFile(additionalInfo);
} else {
std::string operation("reading file ");
fatalError(operation.append(additionalInfo));
}
break;
case KeyMode::NONE_KEYMODE:
default:
std::cerr << "Password fetching method not specified." << std::endl;
break;
}
return result;
}
void showUsage(ErrorCode code, const std::string &msg) {
if (code != ErrorCode::NOERROR_CODE) {
std::cerr << "Error" << (msg.empty() ? "" : ": " + msg + ".\n") << std::endl;
}
std::cerr << "Usage: keylessh.exe [options] [parameters to pass to ssh]\n"
" /f filename Take password to use from file\n"
" /p password Provide password as argument (don't)\n"
" /e Password is passed as environment variable \"" ENVVAR_NAME "\"\n"
" /c credname Passsword taken from Windows Credentials Manager key \"credname\"\n"
" /V Print version information\n" << std::endl;
}
std::string findAskPass() {
char path[MAX_PATH];
DWORD res = GetModuleFileNameA(NULL, path, MAX_PATH);
std::string result(path);
result = result.append("\\ask_pass.exe");
return result;
}
void launchProcess(std::string &cmdLine, bool createCommPipes, PROCESS_INFORMATION& pi) {
SECURITY_ATTRIBUTES saAttr;
::ZeroMemory(&saAttr, sizeof(SECURITY_ATTRIBUTES));
saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
STARTUPINFOA si;
::ZeroMemory(&si, sizeof(STARTUPINFO));
si.cb = sizeof(STARTUPINFO);
si.dwFlags = 0;
// The read end of one pipe serves as standard input for the child process,
// and the write end of the other pipe is the standard output for the child process.
HANDLE hChildStdinRead = NULL;
HANDLE hChildStdinWrite = NULL;
HANDLE hChildStdoutRead = NULL;
HANDLE hChildStdoutWrite = NULL;
if (createCommPipes) {
// Set the bInheritHandle flag to TRUE so pipe handles are inherited.
saAttr.bInheritHandle = TRUE;
saAttr.lpSecurityDescriptor = NULL;
if (!::CreatePipe(&hChildStdoutRead, &hChildStdoutWrite, &saAttr, 0) ||
!::SetHandleInformation(hChildStdoutRead, HANDLE_FLAG_INHERIT, 0) ||
!::CreatePipe(&hChildStdinRead, &hChildStdinWrite, &saAttr, 0) ||
!::SetHandleInformation(hChildStdinWrite, HANDLE_FLAG_INHERIT, 0)) {
throw std::string("err");
}
// create Startup info structure with handles
si.dwFlags |= STARTF_USESTDHANDLES;
si.hStdError = hChildStdoutWrite;
si.hStdOutput = hChildStdoutWrite;
si.hStdInput = hChildStdinRead;
}
// The process information receives info when calling CreateProcessX
::ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));
BOOL bRet = ::CreateProcessA(
NULL, // Application path
const_cast<char *>(cmdLine.c_str()), // Command line, including exec since 1st arg is NULL
NULL, // Process handle not inheritable
NULL, // Thread handle not inheritable
TRUE, // Set handle inheritance to TRUE
0, // Detached process without console would be DETACHED_PROCESS
NULL, // Use parent's environment block
NULL, // Use parent's starting directory
&si, // Pointer to STARTUPINFO structure
&pi // Pointer to PROCESS_INFORMATION structure
);
if (!bRet) {
fatalError(std::string("CreateProcessA"));
}
if (createCommPipes) {
// Close handles to the stdin and stdout pipes no longer needed by the child process.
::CloseHandle(hChildStdoutWrite);
::CloseHandle(hChildStdinRead);
}
// could return these handles instead of closing them
::CloseHandle(hChildStdinWrite); // write to child process here
::CloseHandle(hChildStdoutRead); // read child process stdout here
}
void fatalError(const std::string &operation) {
DWORD error = ::GetLastError();
std::string message = std::system_category().message(error);
std::cerr << "Failed with error " << error << ": " << message << " in operation " << operation << ".\n";
::ExitProcess(1);
}
char* str_join(char* array[], int start, int end) {
// Calculate the total length of the concatenated string
int totalLength = 1; // for the null terminator
for (int i = start; i < end; i++) {
totalLength += ::strlen(array[i]) + 1;
}
// Allocate memory for the new string
char* result = (char *) ::malloc(totalLength * sizeof(char));
// Initialize the result string as an empty string
result[0] = '\0';
// Concatenate the strings
for (int i = start; i < end; i++) {
::strcat(result, array[i]);
::strcat(result, " ");
}
return result;
}
ProgArguments readArguments(int argc, char *argv[]) {
ProgArguments args;
args.m_errCode = NOERROR_CODE;
args.m_keyMode = NONE_KEYMODE;
args.m_errMessage = NULL;
args.m_subArg = NULL;
if (argc <= 2) {
args.m_errCode = ErrorCode::NOT_ENOUGH_ARGS;
args.m_errMessage = "Please specify at least one argument";
} else {
int sshParamIndexStart = 1;
for (int i = 1; i < argc && args.m_errCode == ErrorCode::NOERROR_CODE; ++i) {
char *curArg = argv[i];
KeyMode newKeyMode = KeyMode::NONE_KEYMODE;
if (strcmp(curArg, "/f") == 0) {
newKeyMode = KeyMode::KEY_FILE;
if (i < argc - 1) {
args.m_subArg = argv[i + 1];
++i;
} else {
args.m_errCode = ErrorCode::INVALID_USAGE;
}
} else if (strcmp(curArg, "/p") == 0) {
newKeyMode = KeyMode::CMDLINE_KEY;
if (i < argc - 1) {
args.m_subArg = argv[i + 1];
++i;
} else {
args.m_errCode = ErrorCode::INVALID_USAGE;
}
} else if (strcmp(curArg, "/c") == 0) {
newKeyMode = KeyMode::CRED_MAN;
if (i < argc - 1) {
args.m_subArg = argv[i + 1];
++i;
} else {
args.m_errCode = ErrorCode::INVALID_USAGE;
}
} else if (strcmp(curArg, "/e") == 0) {
newKeyMode = KeyMode::ENV_VAR;
} else if (strcmp(curArg, "/V") == 0) {
args.m_showVersion = true;
} else {
sshParamIndexStart = i; // must be ssh param
i = argc; // exit loop
}
if (args.m_errCode == ErrorCode::NOERROR_CODE) {
if (newKeyMode != KeyMode::NONE_KEYMODE) {
if (args.m_keyMode == KeyMode::NONE_KEYMODE) {
args.m_keyMode = newKeyMode;
} else {
args.m_errCode = ErrorCode::INVALID_USAGE;
args.m_errMessage = "Multiple key modes specified; pick one";
}
}
}
} // for loop on args
if (args.m_errCode == ErrorCode::NOERROR_CODE) {
if (sshParamIndexStart >= argc) {
args.m_errCode = ErrorCode::NO_SSH_PARAM;
args.m_errMessage = "No parameters to pass to ssh were specified";
} else {
args.m_sshArguments = str_join(argv, sshParamIndexStart, argc);
}
}
}
return args;
}
}