SFTPplug/src/sftpfunc.cpp at dev · remittor/SFTPplug · GitHub

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#include "global.h"

#include <windows.h>

#include <ws2tcpip.h>

#include <shellapi.h>

#include <commdlg.h>

#include <stdio.h>

#include <fcntl.h>

#include "sftpfunc.h"

#include "sftpplug.h"

#include "fsplugin.h"

#include "multiserver.h"

#include "res/resource.h"

#include "utils.h"

#include "CVTUTF.H"

#include <afxres.h>

#include "cunicode.h"

#include "ftpdir.h"

bool serverfieldchangedbyuser = false;

char Global_TransferMode = 'I'; //I=Binary, A=Ansi, X=Auto

WCHAR Global_TextTypes[1024];

char global_detectcrlf = 0;

VOID CALLBACK TimerProc(HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime) noexcept;

LIBSSH2_CHANNEL * ConnectChannel(LIBSSH2_SESSION *session) noexcept;

bool SendChannelCommand(LIBSSH2_SESSION * session, LIBSSH2_CHANNEL * channel, LPCSTR command) noexcept;

bool GetChannelCommandReply(LIBSSH2_SESSION * session, LIBSSH2_CHANNEL * channel, LPCSTR command) noexcept;

void DisconnectShell(LIBSSH2_CHANNEL * channel) noexcept;

void StripEscapeSequences(LPSTR msgbuf) noexcept;

bool ReadChannelLine(LIBSSH2_CHANNEL * channel, LPSTR line, size_t linelen, LPSTR msgbuf, size_t msgbuflen, LPSTR errbuf, size_t errbuflen);

int CloseRemote(SERVERID serverid, LIBSSH2_SFTP_HANDLE * remotefilesftp, LIBSSH2_CHANNEL * remotefilescp, bool timeout, int percent) noexcept;

pConnectSettings gConnectResults;

LPCSTR gDisplayName;

LPCSTR gIniFileName;

int g_focusset = 0;

#ifndef SFTP_ALLINONE

HINSTANCE sshlib = NULL;

#endif

bool loadOK, loadAgent;

void EncryptString(LPCSTR pszPlain, LPSTR pszEncrypted, size_t cchEncrypted);

typedef struct {

LIBSSH2_CHANNEL *channel;

char msgbuf[2048]; // previously received data

char errbuf[2048];

} SCP_DATA;

bool EscapePressed() noexcept

{

// Abort with ESCAPE pressed in same program only!

if (GetAsyncKeyState(VK_ESCAPE) < 0) {

DWORD procid1 = 0;

HWND hwnd = GetActiveWindow();

if (hwnd) {

GetWindowThreadProcessId(hwnd, &procid1);

if (procid1 == GetCurrentProcessId())

return true;

}

return false;

}

void strlcpyansitoutf8(LPSTR utf8str, LPCSTR ansistr, size_t maxlen) noexcept

{

WCHAR utf16buf[1024];

MultiByteToWideChar(CP_ACP, 0, ansistr, -1, utf16buf, _countof(utf16buf));

ConvUTF16toUTF8(utf16buf, 0, utf8str, maxlen);

}

void wcslcpytoutf8(LPSTR utf8str, LPCWSTR utf16str, size_t maxlen)

{

ConvUTF16toUTF8(utf16str, 0, utf8str, maxlen);

}

void CopyStringW2A(pConnectSettings ConnectSettings, LPCWSTR instr, LPSTR outstr, size_t outmax) noexcept

{

if (ConnectSettings->utf8names) {

ConvUTF16toUTF8(instr, 0, outstr, outmax);

} else {

walcopyCP(ConnectSettings->codepage, outstr, instr, outmax - 1);

}

void CopyStringA2W(pConnectSettings ConnectSettings, LPCSTR instr, LPWSTR outstr, size_t outmax, bool useCVT = true) noexcept

{

if (ConnectSettings->utf8names) {

if (useCVT)

ConvUTF8toUTF16(instr, 0, outstr, outmax);

else

awlcopyCP(CP_UTF8, outstr, instr, outmax - 1);

} else {

awlcopyCP(ConnectSettings->codepage, outstr, instr, outmax - 1);

}

#ifndef SFTP_ALLINONE

static FARPROC GetProcAddress2(HMODULE hModule, LPCSTR lpProcName) noexcept

{

FARPROC retval = GetProcAddress(hModule, lpProcName);

if (!retval)

loadOK = false;

return retval;

}

static FARPROC GetProcAddressAgent(HMODULE hModule, LPCSTR lpProcName) noexcept

{

FARPROC retval = GetProcAddress(hModule, lpProcName);

if (!retval)

loadAgent = false;

return retval;

}

#define FUNCDEF(r, f, p) typedef r (*t##f) p;

#define FUNCDEF2(r, f, p) typedef r (*t##f) p;

#include "sshdynfunctions.h"

#undef FUNCDEF2

#undef FUNCDEF

#define FUNCDEF(r, f, p) t##f f=NULL;

#define FUNCDEF2(r, f, p) t##f f=NULL;

#include "sshdynfunctions.h"

#undef FUNCDEF2

#undef FUNCDEF

static HINSTANCE LoadDllAdv(LPCSTR path, LPCSTR subdir, LPCSTR name, DWORD flags = 0) noexcept

{

HMODULE lib = NULL;

char dllname[MAX_PATH];

strlcpy(dllname, path, countof(dllname) - 1);

if (subdir && subdir[0]) {

strlcat(dllname, subdir, countof(dllname) - 1);

strlcat(dllname, "\\", countof(dllname) - 1);

}

strlcat(dllname, name, countof(dllname) - 1);

if (flags) {

lib = LoadLibraryExA(dllname, NULL, flags);

} else {

lib = LoadLibraryA(dllname);

}

return (HINSTANCE)lib;

}

static HINSTANCE LoadAllLibs(LPCSTR dllpath) noexcept

{

HMODULE lib = NULL;

// Load libeay32.dll first, otherwise it will not be found!

#ifdef _WIN64

LoadDllAdv(dllpath, "64", "zlibwapi.dll");

LoadDllAdv(dllpath, "64", "zlib1.dll");

LoadDllAdv(dllpath, "64", "libeay32.dll");

lib = LoadDllAdv(dllpath, "64", "libssh2.dll");

if (!lib) {

LoadDllAdv(dllpath, "x64", "zlibwapi.dll");

LoadDllAdv(dllpath, "x64", "zlib1.dll");

LoadDllAdv(dllpath, "x64", "libeay32.dll");

lib = LoadDllAdv(dllpath, "x64", "libssh2.dll");

}

#endif

if (!lib) {

LoadDllAdv(dllpath, "", "zlibwapi.dll");

LoadDllAdv(dllpath, "", "zlib1.dll");

LoadDllAdv(dllpath, "", "libeay32.dll");

lib = LoadDllAdv(dllpath, "", "libssh2.dll");

}

return (HINSTANCE)lib;

}

bool LoadSSHLib() noexcept

{

if (sshlib)

return loadOK;

LogProc(PluginNumber, MSGTYPE_DETAILS, "Loading SSH Library");

int olderrormode = SetErrorMode(0x8001);

char dllname[MAX_PATH];

dllname[0] = 0;

// first, try in the DLL directory (changed from previous versions)

GetModuleFileName(hinst, dllname, sizeof(dllname)-10);

LPSTR p = strrchr(dllname, '\\');

p = p ? p + 1 : dllname;

p[0] = 0;

sshlib = LoadAllLibs(dllname);

if (!sshlib) {

GetModuleFileName(NULL, dllname, sizeof(dllname) - 10);

LPSTR p = strrchr(dllname, '\\');

p = p ? p + 1 : dllname;

p[0] = 0;

sshlib = LoadAllLibs(dllname);

}

if (!sshlib) {

// try also in Total Commander dir and the path!

// we don't need to load libeay32.dll then, because

// libssh2.dll would find it in the path anyway!

sshlib = (HINSTANCE)LoadLibraryA("libssh2.dll");

}

if (!sshlib) {

OSVERSIONINFO vx;

vx.dwOSVersionInfoSize = sizeof(vx);

GetVersionEx(&vx);

if (vx.dwPlatformId == VER_PLATFORM_WIN32_NT && vx.dwMajorVersion < 6) { // XP or older?

GetModuleFileName(hinst, dllname, sizeof(dllname)-10);

LPSTR p = strrchr(dllname,'\\');

p = p ? p + 1 : dllname;

p[0] = 0;

#ifdef _WIN64

sshlib = LoadDllAdv(dllname, "64", "libssh2.dll", LOAD_LIBRARY_AS_DATAFILE);

if (!sshlib) {

sshlib = LoadDllAdv(dllname, "x64", "libssh2.dll", LOAD_LIBRARY_AS_DATAFILE);

}

#endif

if (!sshlib) {

sshlib = LoadDllAdv(dllname, "", "libssh2.dll", LOAD_LIBRARY_AS_DATAFILE);

}

if (sshlib) {

HICON icon = LoadIcon(sshlib, MAKEINTRESOURCE(12345)); /* FIXME: magic number! */

FreeLibrary(sshlib);

sshlib = NULL;

if (icon) {

LPCSTR txt = "This plugin requires Windows Vista, 7 or newer. "

"Please get the separate plugin for Windows XP or older from www.ghisler.com!";

MessageBox(GetActiveWindow(), txt, "Error", MB_ICONSTOP);

return false;

}

LPCSTR txt = "Please put the openssl dlls either\n"

"- in the same directory as the plugin, or\n"

"- in the Total Commander dir, or\n"

#ifdef _WIN64

"- in subdir \"64\" of the plugin or TC directory, or\n"

#endif

"- somewhere in your PATH!\n\nDownload now?";

int res = MessageBox(GetActiveWindow(), txt, "Error", MB_YESNO | MB_ICONSTOP);

if (res == IDYES)

ShellExecute(GetActiveWindow(), NULL, "https://www.ghisler.com/openssl", NULL, NULL, SW_SHOW);

return false;

}

SetErrorMode(olderrormode);

loadOK = true;

loadAgent = true;

// the following will load all the functions!

#define FUNCDEF(r, f, p) f=(t##f)GetProcAddress2(sshlib, #f)

#define FUNCDEF2(r, f, p) f=(t##f)GetProcAddressAgent(sshlib, #f)

#include "sshdynfunctions.h"

#undef FUNCDEF2

#undef FUNCDEF

return loadOK;

}

#else

bool LoadSSHLib() noexcept

{

loadOK = true;

loadAgent = true;

return true;

}

#endif /* SFTP_ALLINONE */

extern "C"

void kbd_callback(LPCSTR name, int name_len,

LPCSTR instruction, int instruction_len, int num_prompts,

const LIBSSH2_USERAUTH_KBDINT_PROMPT * prompts,

LIBSSH2_USERAUTH_KBDINT_RESPONSE * responses,

LPVOID * abstract)

{

char buf[1024];

char retbuf[256];

pConnectSettings ConnectSettings = (pConnectSettings)*abstract;

for (int i = 0; i < num_prompts; i++) {

// Special case: Pass the stored password as the first response to the interactive prompts

// Note: We may get multiple calls to kbd_callback - this is tracked with "InteractivePasswordSent"

strlcpy(retbuf, prompts[i].text, min(prompts[i].length, sizeof(retbuf)-1));

ShowStatus(retbuf);

bool autoSendPassword = (ConnectSettings && ConnectSettings->password[0] && !ConnectSettings->InteractivePasswordSent);

if (autoSendPassword) {

strlwr(retbuf);

// it must contain "pass"

if (strstr(retbuf, "pass") == NULL)

autoSendPassword = false;

// it must NOT contain "OATH" or "one time" or "one_time"

else if (strstr(retbuf, "OATH") || strstr(retbuf, "one time") || strstr(retbuf, "one-time"))

autoSendPassword = false;

}

if (autoSendPassword) {

ConnectSettings->InteractivePasswordSent = true;

char* p = strstr(ConnectSettings->password, "\",\"");

size_t len = strlen(ConnectSettings->password);

if (p && ConnectSettings->password[0] == '"' && ConnectSettings->password[len-1] == '"') {

// two passwords -> use second one!

ConnectSettings->password[len-1] = 0;

if (p[3] == 0)

autoSendPassword = false;

else

responses[i].text = _strdup(p + 3);

ConnectSettings->password[len-1] = '"';

} else {

responses[i].text = _strdup(ConnectSettings->password);

}

if (autoSendPassword) {

responses[i].length = (unsigned int)strlen(responses[0].text);

ShowStatus("sending stored password");

}

if (!autoSendPassword) {

char title[128];

buf[0] = 0;

title[0] = 0;

if (instruction && instruction_len) {

strlcpy(buf, instruction, min(instruction_len, sizeof(buf)-1));

strlcat(buf, "\n", sizeof(buf)-1);

}

if (prompts[i].length && prompts[i].text) {

strlcpy(retbuf, prompts[i].text, min(prompts[i].length, sizeof(retbuf)-1));

strlcat(buf, retbuf, sizeof(buf)-1);

}

if (buf[0] == 0)

strlcat(buf, "Password:", sizeof(buf)-1);

if (name && name_len)

strlcpy(title, name, min(name_len, sizeof(title)-1));

else

strlcpy(title, "SFTP password for", sizeof(title)-1);

if (ConnectSettings) {

strlcat(title, " ", sizeof(title)-1);

strlcat(title, ConnectSettings->user, sizeof(title)-1);

strlcat(title, "@", sizeof(title)-1);

strlcat(title, ConnectSettings->server, sizeof(title)-1);

}

retbuf[0] = 0;

ShowStatus("requesting password from user...");

if (RequestProc(PluginNumber, RT_Password, title, buf, retbuf, sizeof(retbuf)-1)) {

responses[i].text = _strdup(retbuf);

responses[i].length = (unsigned int)strlen(retbuf);

// Remember password for background transfers

if (ConnectSettings && ConnectSettings->password[0] == 0)

strlcpy(ConnectSettings->password, retbuf, sizeof(ConnectSettings->password)-1);

ShowStatus("sending password entered by user");

} else {

responses[i].text = NULL;

responses[i].length = 0;

}

} /* kbd_callback */

extern "C"

LPVOID myalloc(size_t count, LPVOID * abstract)

{

return malloc(count);

}

extern "C"

LPVOID myrealloc(LPVOID ptr, size_t count, LPVOID * abstract)

{

// avoid possible memory leak if realloc fails

LPVOID ptrSav = ptr;

ptr = realloc(ptr, count);

if (ptr == NULL && ptrSav != NULL)

free(ptrSav);

return ptr;

}

extern "C"

void myfree(LPVOID ptr, LPVOID * abstract)

{

free(ptr);

}

static bool ismimechar(const char ch)

{

return ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') || (ch >= '0' && ch <= '9') ||

ch == '/' || ch == '+' || ch == '=' || ch == '\r' || ch == '\n');

}

/* return false when TASK aborted */

bool ProgressLoop(LPCSTR progresstext, int start, int end, int * loopval, SYSTICKS * lasttime)

{

SYSTICKS time = get_sys_ticks();

if (time - *lasttime > 100 || *loopval < start) { /* FIXME: magic number! */

*lasttime = time;

(*loopval)++;

if (*loopval < start || *loopval > end)

*loopval = start;

return ProgressProc(PluginNumber, progresstext, "-", *loopval) != 0; /* FIXME: magic number! */

}

return false;

}

static void SftpLogLastError(LPCSTR errtext, int errnr)

{

char errbuf[128];

if (errnr == 0 || errnr == LIBSSH2_ERROR_EAGAIN) //no error -> do not log

return;

strlcpy(errbuf, errtext, countof(errbuf) - 10);

errnr = -errnr;

if (errnr >= 0 && errnr < countof(ERRORNAMES)) {

strlcat(errbuf, ERRORNAMES[errnr], sizeof(errbuf)-8);

strlcat(errbuf, " (", sizeof(errbuf)-6);

_itoa(errnr, errbuf + strlen(errbuf), 10);

strlcat(errbuf, ")", sizeof(errbuf)-1);

} else {

_itoa(errnr, errbuf + strlen(errbuf), 10);

}

LogProc(PluginNumber, MSGTYPE_IMPORTANTERROR, errbuf);

}

static void ShowMessageIdEx(int errorid, LPCSTR p1, int p2, bool silent)

{

char errorstr[256];

char fmt[256];

if (errorid < 0)

return;

LoadStr(errorstr, errorid);

if (p1) {

strcpy(fmt, errorstr);

if (strstr(errorstr, "%s"))

sprintf_s(errorstr, countof(errorstr), fmt, p1);

else if (strstr(errorstr, "%d"))

sprintf_s(errorstr, countof(errorstr), fmt, p2);

else

strlcat(errorstr, p1, sizeof(errorstr)-1);

}

ShowStatus(errorstr); // log it

if (!silent)

RequestProc(PluginNumber, RT_MsgOK, "SFTP Error", errorstr, NULL, 0);

}

static void ShowStatusId(int errorid, bool silent, int value)

{

ShowMessageIdEx(errorid, "", value, silent);

}

static void ShowStatusId(int errorid, LPCSTR suffix, bool silent = true)

{

ShowMessageIdEx(errorid, suffix, 0, silent);

}

static void ShowErrorId(int errorid, LPCSTR suffix = NULL)

{

ShowMessageIdEx(errorid, NULL, 0, false);

}

static void ShowError(LPCSTR error)

{

ShowStatus(error); // log it

RequestProc(PluginNumber, RT_MsgOK, "SFTP Error", error, NULL, 0);

}

static void SetBlockingSocket(SOCKET s, bool blocking)

{

u_long arg = blocking ? 0 : 1;

ioctlsocket(s, FIONBIO, &arg);

}

static bool IsSocketError(SOCKET s)

{

fd_set fds;

timeval timeout = gettimeval(50); /* FIXME: magic number! */

FD_ZERO(&fds);

FD_SET(s, &fds);

return 1 == select(0, NULL, NULL, &fds, &timeout);

}

static bool IsSocketWritable(SOCKET s)

{

fd_set fds;

timeval timeout = gettimeval(50); /* FIXME: magic number! */

FD_ZERO(&fds);

FD_SET(s, &fds);

return 1 == select(0, NULL, &fds, NULL, &timeout);

}

static bool IsSocketReadable(SOCKET s)

{

fd_set fds;

timeval timeout = gettimeval(1000); // This is absolutely necessary, otherwise wingate local will not work! /* FIXME: magic number! */

FD_ZERO(&fds);

FD_SET(s, &fds);

int err = select(0, &fds, NULL, NULL, &timeout);

return (err == 1);

}

extern "C"

int mysend(SOCKET s, LPCSTR buf, int len, int flags, LPCSTR progressmessage, int progressstart, int * ploop, SYSTICKS * plasttime)

{

int ret = SOCKET_ERROR;

while (true) {

ret = send(s, buf, len, flags);

if (ret != len)

MessageBeep(0); /* FIXME: ???????? */

if (ret >= 0)

return ret;

int err = WSAGetLastError();

if (err == WSAEWOULDBLOCK) {

if (ProgressLoop(progressmessage, progressstart, progressstart + 10, ploop, plasttime))

break;

}

return ret;

}

extern "C"

int myrecv(SOCKET s, LPSTR buf, int len, int flags, LPCSTR progressmessage, int progressstart, int * ploop, SYSTICKS * plasttime)

{

int totallen = len;

int ret = SOCKET_ERROR;

while (true) {

if (IsSocketReadable(s)) {

ret = recv(s, buf, len, flags);

if (ret == len)

return totallen;

if (ret > 0) {

buf += ret;

len -= ret;

continue;

}

if (WSAGetLastError() != WSAEWOULDBLOCK)

return ret;

}

if (ProgressLoop(progressmessage, progressstart, progressstart + 10, ploop, plasttime))

break; /* task aborted */

Sleep(50); /* FIXME: magic number! */

}

return ret;

}

extern "C"

void newpassfunc(LIBSSH2_SESSION * session, LPSTR * newpw, int * newpw_len, LPVOID * abstract)

{

pConnectSettings PassConnectSettings = (pConnectSettings)*abstract;

char title[128], buf1[128];

char newpass[128];

LoadStr(title, IDS_PASS_TITLE);

LoadStr(buf1, IDS_PASS_CHANGE_REQUEST);

newpass[0] = 0;

if (RequestProc(PluginNumber, RT_Password, title, buf1, newpass, sizeof(newpass)-1)) {

size_t bufsize = strlen(newpass) + 1;

*newpw = (char*)malloc(bufsize);

strlcpy(*newpw, newpass, bufsize);

*newpw_len = (int)bufsize;

if (PassConnectSettings) {

strlcpy(PassConnectSettings->password, newpass, sizeof(PassConnectSettings->password)-1);

switch (PassConnectSettings->passSaveMode) {

case sftp::PassSaveMode::crypt:

CryptProc(PluginNumber, CryptoNumber, FS_CRYPT_SAVE_PASSWORD, PassConnectSettings->DisplayName, newpass, 0);

break;

case sftp::PassSaveMode::plain:

if (newpass[0] == 0) {

WritePrivateProfileString(PassConnectSettings->DisplayName, "password", NULL, gIniFileName);

} else {

char szEncryptedPassword[256];

EncryptString(newpass, szEncryptedPassword, countof(szEncryptedPassword));

WritePrivateProfileString(PassConnectSettings->DisplayName, "password", szEncryptedPassword, gIniFileName);

}

break;

}

static int SftpConnectProxyHttp(pConnectSettings ConnectSettings, LPCSTR progressbuf, int progress, int * ploop, SYSTICKS * plasttime)

{

char buf[1024];

// Send "CONNECT hostname:port HTTP/1.1"<CRLF>"Host: hostname:port"<2xCRLF> to the proxy

LPCSTR txt;

if (IsNumericIPv6(ConnectSettings->server))

txt = "CONNECT [%s]:%d HTTP/1.1\r\nHost: [%s]:%d\r\n";

else

txt = "CONNECT %s:%d HTTP/1.1\r\nHost: %s:%d\r\n";

sprintf_s(buf, sizeof(buf), txt, ConnectSettings->server, ConnectSettings->customport, ConnectSettings->server, ConnectSettings->customport);

if (ConnectSettings->proxyuser[0]) {

char buf1[250], buf2[500], title[250];

char passphrase[256];

strlcpy(passphrase, ConnectSettings->proxypassword, sizeof(passphrase)-1);

LoadStr(buf1, IDS_PROXY_PASSWORD_FOR);

strlcpy(title, buf1, sizeof(title)-1);

strlcat(title, ConnectSettings->proxyuser, sizeof(title)-1);

strlcat(title, "@", sizeof(title)-1);

strlcat(title, ConnectSettings->proxyserver, sizeof(title)-1);

LoadStr(buf1, IDS_PROXY_PASSWORD);

if (passphrase[0] == 0)

RequestProc(PluginNumber, RT_Password, title, buf1, passphrase, sizeof(passphrase)-1);

strlcpy(buf1, ConnectSettings->proxyuser, sizeof(buf1)-1);

strlcat(buf1, ":", sizeof(buf1)-1);

strlcat(buf1, passphrase, sizeof(buf1)-1);

strlcat(buf, "Proxy-Authorization: Basic ", sizeof(buf2)-1);

MimeEncode(buf1, buf2, sizeof(buf2)-1);

strlcat(buf, buf2, sizeof(buf)-1);

strlcat(buf, "\r\n", sizeof(buf)-1);

}

strlcat(buf, "\r\n", sizeof(buf)-1);

mysend(ConnectSettings->sock, buf, (int)strlen(buf), 0, progressbuf, progress, ploop, plasttime);

// Response;

// HTTP/1.0 200 Connection established

// Proxy-agent: WinProxy/1.5.3<2xCRLF>

bool lastcrlfcrlf = false;

int nrbytes = myrecv(ConnectSettings->sock, buf, 12, 0, progressbuf, progress, ploop, plasttime);

if (nrbytes == 12 && buf[9] == '2') { // proxy signals success!!

// read data until we get 2xCRLF

bool lastcrlf = false;

bool lastcr = false;

while (1) {

nrbytes = myrecv(ConnectSettings->sock, buf, 1, 0, progressbuf, progress, ploop, plasttime);

if (nrbytes <= 0)

break;

if (buf[0] == '\r') {

lastcr = true;

continue;

}

if (buf[0] != '\n') {

lastcr = false;

lastcrlf = false;

continue;

}

if (!lastcr) {

lastcrlf = false;

continue;

}

if (!lastcrlf) {

lastcrlf = true;

continue;

}

lastcrlfcrlf = true;

break;

}

if (!lastcrlfcrlf) {

ShowErrorId(IDS_VIA_PROXY_CONNECT);

return -1;

}

return SFTP_OK;

}

static int SftpConnectProxySocks4(pConnectSettings ConnectSettings, LPCSTR progressbuf, int progress, int * ploop, SYSTICKS * plasttime)

{

char buf[1024];

ZeroMemory(buf, sizeof(buf));

buf[0] = 4; // version /* FIXME: use SOCKS packet struct */

buf[1] = 1; // TCP connect

*((PWORD)&buf[2]) = htons(ConnectSettings->customport);

// numerical IPv4 given?

ULONG hostaddr = inet_addr(ConnectSettings->server);

if (hostaddr == INADDR_NONE)

*((PLONG)&buf[4]) = htonl(0x00000001); /* FIXME: magic number! */

else

*((PLONG)&buf[4]) = hostaddr; // it's already in network order!

size_t nrbytes = 8; /* FIXME: magic number! */

strlcpy(&buf[nrbytes], ConnectSettings->proxyuser, sizeof(buf) - nrbytes - 1);

nrbytes += strlen(ConnectSettings->proxyuser) + 1;

if (hostaddr == INADDR_NONE) { // SOCKS4A

strlcpy(&buf[nrbytes], ConnectSettings->server, sizeof(buf) - nrbytes - 1);

nrbytes += strlen(ConnectSettings->server) + 1;

}

mysend(ConnectSettings->sock, buf, nrbytes, 0, progressbuf, progress, ploop, plasttime);

int rc = myrecv(ConnectSettings->sock, buf, 8, 0, progressbuf, progress, ploop, plasttime);

if (rc != 8 || buf[0] != 0 || buf[1] != 0x5a) {

ShowErrorId(IDS_VIA_PROXY_CONNECT);

return -1;

}

return SFTP_OK;

}

static int SftpConnectProxySocks5(pConnectSettings ConnectSettings, int connecttoport, LPCSTR progressbuf, int progress, int * ploop, SYSTICKS * plasttime)

{

char buf[1024];

ZeroMemory(buf, sizeof(buf));

buf[0] = 5; // version /* FIXME: use SOCKS packet struct */

buf[2] = 0; // no auth

int nrbytes = 3;

if (ConnectSettings->proxyuser[0]) {

buf[3] = 2; // user/pass auth

nrbytes++;

}

buf[1] = nrbytes - 2; // nr. of methods

mysend(ConnectSettings->sock, buf, nrbytes, 0, progressbuf, progress, ploop, plasttime);

nrbytes = myrecv(ConnectSettings->sock, buf, 2, 0, progressbuf, progress, ploop, plasttime);

if (!ConnectSettings->proxyuser[0] && buf[1] != 0) {

*((PBYTE)&buf[1]) = 0xff;

}

if (nrbytes != 2 || buf[0] != 5 || buf[1] == 0xff) {

ShowErrorId(IDS_VIA_PROXY_CONNECT);

return -1;

}

if (buf[1] == 2) { // user/pass auth

size_t len;

ZeroMemory(buf, sizeof(buf));

buf[0] = 1; // version

len = strlen(ConnectSettings->proxyuser);

buf[1] = len;

strlcpy(&buf[2], ConnectSettings->proxyuser, sizeof(buf)-3);

nrbytes = len + 2;

len = strlen(ConnectSettings->proxypassword);

buf[nrbytes] = len;

strlcpy(&buf[nrbytes+1], ConnectSettings->proxypassword, sizeof(buf) - nrbytes - 1);

nrbytes += len + 1;

mysend(ConnectSettings->sock, buf, nrbytes, 0, progressbuf, progress, ploop, plasttime);

nrbytes = myrecv(ConnectSettings->sock, buf, 2, 0, progressbuf, progress, ploop, plasttime);

if (nrbytes != 2 || buf[1] != 0) {

LoadStr(buf, IDS_SOCKS5PROXYERR);

ShowError(buf);

return -2;

}

ZeroMemory(buf, sizeof(buf));

buf[0] = 5; // version /* FIXME: use SOCKS packet struct */

buf[1] = 1; // TCP connect

buf[2] = 0; // reserved

ULONG hostaddr = inet_addr(ConnectSettings->server);

if (hostaddr != INADDR_NONE) {

buf[3] = 1; // addrtype (IPv4)

*((PLONG)&buf[4]) = hostaddr; // it's already in network order!

nrbytes = 4 + 4;

} else {

bool numipv6 = false; // is it an IPv6 numeric address?

if (IsNumericIPv6(ConnectSettings->server)) {

struct addrinfo hints;

memset(&hints, 0, sizeof(hints));

hints.ai_family = AF_INET6;

hints.ai_socktype = SOCK_STREAM;

sprintf_s(buf, sizeof(buf), "%d", connecttoport);

struct addrinfo * res = NULL;

if (getaddrinfo(ConnectSettings->server, buf, &hints, &res) == 0) {

if (res->ai_addrlen >= sizeof(sockaddr_in6)) {

numipv6 = true;

buf[3] = 4; // IPv6

memcpy(&buf[4], &((sockaddr_in6 *)res->ai_addr)->sin6_addr, 16);

nrbytes = 4 + 16;

}

freeaddrinfo(res);

}

if (!numipv6) {

buf[3] = 3; // addrtype (domainname)

buf[4] = (char)strlen(ConnectSettings->server);

strlcpy(&buf[5], ConnectSettings->server, sizeof(buf)-6);

nrbytes = (UCHAR)buf[4] + 5;

}

*((PWORD)&buf[nrbytes]) = htons(ConnectSettings->customport);

nrbytes += 2;

mysend(ConnectSettings->sock, buf, nrbytes, 0, progressbuf, progress, ploop, plasttime);

nrbytes = myrecv(ConnectSettings->sock, buf, 4, 0, progressbuf, progress, ploop, plasttime);

if (nrbytes != 4 || buf[0] != 5 || buf[1] != 0) {

//ShowErrorId(IDS_VIA_PROXY_CONNECT);

switch(buf[1]) {

case 1: LoadStr(buf, IDS_GENERALSOCKSFAILURE); break;

case 2: LoadStr(buf, IDS_CONNNOTALLOWED); break;

case 3: LoadStr(buf, IDS_NETUNREACHABLE); break;

case 4: LoadStr(buf, IDS_HOSTUNREACHABLE); break;

case 5: LoadStr(buf, IDS_CONNREFUSED); break;

case 6: LoadStr(buf, IDS_TTLEXPIRED); break;

case 7: LoadStr(buf, IDS_CMDNOTSUPPORTED); break;

case 8: LoadStr(buf, IDS_ADDRTYPENOTSUPPORTED); break;

default:

{

char buf2[MAX_PATH];

LoadStr(buf2, IDS_UNKNOWNSOCKERR);

sprintf_s(buf, sizeof(buf), buf2, buf[1]);

}

ShowError(buf);

return -3;

}

int needread = 0;

switch(buf[3]) {

case 1:

needread = 6; // IPv4+port

break;

case 3:

nrbytes = myrecv(ConnectSettings->sock, buf, 1, 0, progressbuf, progress, ploop, plasttime);

if (nrbytes == 1)

needread = buf[0] + 2;

break; // Domain Name+port

case 4:

needread = 18; // IPv6+port

break;

}

nrbytes = myrecv(ConnectSettings->sock, buf, needread, 0, progressbuf, progress, ploop, plasttime);

if (nrbytes != needread) {

ShowErrorId(IDS_VIA_PROXY_CONNECT);

return -4;

}

return SFTP_OK;

}

const int SSH_AUTH_PASSWORD = 0x01;

const int SSH_AUTH_KEYBOARD = 0x02;

const int SSH_AUTH_PUBKEY = 0x04;

static int SftpAuthPageant(pConnectSettings ConnectSettings, LPCSTR progressbuf, int progress, int * ploop, SYSTICKS * plasttime, int * auth_pw)

{

int hr = -IDS_AGENT_AUTHFAILED;

char buf[1024];

struct libssh2_agent_publickey * identity = NULL;

struct libssh2_agent_publickey * prev_identity = NULL;

LIBSSH2_AGENT * agent = libssh2_agent_init(ConnectSettings->session);

if (!agent || libssh2_agent_connect(agent) != 0) {

if (agent) {

libssh2_agent_disconnect(agent);

libssh2_agent_free(agent);

agent = NULL;

}

// Try to launch Pageant!

char linkname[MAX_PATH], dirname[MAX_PATH];

dirname[0] = 0;

GetModuleFileName(hinst, dirname, sizeof(dirname)-10);

char* p = strrchr(dirname, '\\');

p = p ? p + 1 : dirname;

p[0] = 0;

strlcpy(linkname, dirname, MAX_PATH-1);

strlcat(linkname, "pageant.lnk", MAX_PATH-1);

if (GetFileAttributesA(linkname) == INVALID_FILE_ATTRIBUTES)

FIN(-IDS_AGENT_CONNECTERROR);

HWND active = GetForegroundWindow();

ShellExecute(active, NULL, linkname, NULL, dirname, SW_SHOW);

Sleep(2000);

SYSTICKS starttime = get_sys_ticks();

while (active != GetForegroundWindow() && get_ticks_between(starttime) < 20000) { /* FIXME: magic number! */

Sleep(200);

if (ProgressLoop(progressbuf, progress, progress + 5, ploop, plasttime))

break;

}

agent = libssh2_agent_init(ConnectSettings->session);

FIN_IF(!agent, -IDS_AGENT_CONNECTERROR);

int rc = libssh2_agent_connect(agent);

FIN_IF(rc, -IDS_AGENT_CONNECTERROR);

}

int rc = libssh2_agent_list_identities(agent);

FIN_IF(rc, -IDS_AGENT_REQUESTIDENTITIES);

while (1) {

int auth = libssh2_agent_get_identity(agent, &identity, prev_identity);

FIN_IF(auth == 1, -IDS_AGENT_AUTHFAILED); /* pub key */

FIN_IF(auth < 0, -IDS_AGENT_NOIDENTITY);

char buf1[128];

LoadStr(buf1, IDS_AGENT_TRYING1);

strlcpy(buf, buf1, sizeof(buf)-1);

strlcat(buf, ConnectSettings->user, sizeof(buf)-1);

LoadStr(buf1, IDS_AGENT_TRYING2);

strlcat(buf, buf1, sizeof(buf)-1);

strlcat(buf, identity->comment, sizeof(buf)-1);

LoadStr(buf1, IDS_AGENT_TRYING3);

strlcat(buf, buf1, sizeof(buf)-1);

ShowStatus(buf);

while ((auth = libssh2_agent_userauth(agent, ConnectSettings->user, identity)) == LIBSSH2_ERROR_EAGAIN);

#ifndef SFTP_ALLINONE

if (auth == LIBSSH2_ERROR_REQUIRE_KEYBOARD) { /* FIXME: patch libssh2 */

*auth_pw = SSH_AUTH_KEYBOARD;

FIN(SSH_AUTH_KEYBOARD);

}

if (auth == LIBSSH2_ERROR_REQUIRE_PASSWORD) { /* FIXME: patch libssh2 */

*auth_pw = SSH_AUTH_PASSWORD;

FIN(SSH_AUTH_PASSWORD);

}

#endif

FIN_IF(auth == 0, 0); /* OK */

prev_identity = identity;

}

hr = -IDS_AGENT_AUTHFAILED;

fin:

if (hr < 0) {

ShowStatusId(-hr, NULL, true);

}

if (hr == 0) {

ShowStatusId(IDS_AGENT_AUTHSUCCEEDED, NULL, true);

}

if (agent) {

libssh2_agent_disconnect(agent);

libssh2_agent_free(agent);

}

return hr;

}

static int SftpAuthPubKey(pConnectSettings ConnectSettings, LPCSTR progressbuf, int progress, int * ploop, SYSTICKS * plasttime, int * auth_pw)

{

int hr = -LIBSSH2_ERROR_FILE;

char buf[1024];

bool pubkeybad = false;

char filebuf[1024];

char passphrase[256];

char pubkeyfile[MAX_PATH], privkeyfile[MAX_PATH];

char* pubkeyfileptr = pubkeyfile;

strlcpy(pubkeyfile, ConnectSettings->pubkeyfile, sizeof(pubkeyfile)-1);

ReplaceSubString(pubkeyfile, "%USER%", ConnectSettings->user, sizeof(pubkeyfile)-1);

ReplaceEnvVars(pubkeyfile, sizeof(pubkeyfile)-1);

strlcpy(privkeyfile, ConnectSettings->privkeyfile, sizeof(privkeyfile)-1);

ReplaceSubString(privkeyfile, "%USER%", ConnectSettings->user, sizeof(privkeyfile)-1);

ReplaceEnvVars(privkeyfile, sizeof(privkeyfile)-1);

passphrase[0] = 0;

// verify that we have a valid public key file

DWORD dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;

DWORD dwFlags = FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN;

HANDLE hf = CreateFileA(pubkeyfile, GENERIC_READ, dwShareMode, NULL, OPEN_EXISTING, dwFlags, NULL);

FIN_IF(!hf || hf == INVALID_HANDLE_VALUE, -IDS_ERR_LOAD_PUBKEY);

DWORD dataread = 0;

if (ReadFile(hf, &filebuf, 35, &dataread, NULL)) {

if (_strnicmp(filebuf, "ssh-", 4) != 0 &&

_strnicmp(filebuf, "ecdsa-", 6) != 0 &&

_strnicmp(filebuf, "-----BEGIN OPENSSH PRIVATE KEY-----", 35) != 0)

{

FIN(-IDS_ERR_PUBKEY_WRONG_FORMAT);

}

CloseHandle(hf);

// do not ask for the pass phrase if the key isn't encrypted!

hf = CreateFile(privkeyfile, GENERIC_READ, dwShareMode, NULL, OPEN_EXISTING, dwFlags, NULL);

FIN_IF(!hf || hf == INVALID_HANDLE_VALUE, IDS_ERR_LOAD_PRIVKEY);

dataread = 0;

bool isencrypted = true;

if (ReadFile(hf, &filebuf, sizeof(filebuf)-32, &dataread, NULL)) {

filebuf[dataread] = 0;

LPSTR p = strchr(filebuf, '\n');

if (!p)

p = strchr(filebuf, '\r');

if (p) {

p++;

while (p[0] == '\r' || p[0] == '\n')

p++;

isencrypted = false;

// if there is something else than just MIME-encoded data,

// then the key is encrypted -> we need a pass phrase

for (int i = 0; i < 32; i++)

if (!ismimechar(p[i]))

isencrypted = true;

// new format -----BEGIN OPENSSH PRIVATE KEY-----

// check whether the encoded string contains bcrypt

if (!isencrypted) {

char* p2 = filebuf;

while (p2[0] == '\r' || p2[0] == '\n')

p2++;

if (strncmp(p2, "-----BEGIN OPENSSH PRIVATE KEY-----", 35) == 0) {

char outbuf[64];

int len = MimeDecode(p, min(64, strlen(p)), outbuf, sizeof(outbuf));

for (int i = 0; i < len - 6; i++) {

if (outbuf[i] == 'b' && strncmp(outbuf + i, "bcrypt", 6) == 0) {

isencrypted = true;

break;

}

CloseHandle(hf);

if (isencrypted) {

char title[250];

LoadStr(buf, IDS_PASSPHRASE);

strlcpy(title, buf, sizeof(title)-1);

strlcat(title, ConnectSettings->user, sizeof(title)-1);

strlcat(title, "@", sizeof(title)-1);

strlcat(title, ConnectSettings->server, sizeof(title)-1);

LoadStr(buf, IDS_KEYPASSPHRASE);

if (ConnectSettings->password[0] != 0) {

char* p = strstr(ConnectSettings->password, "\",\"");

size_t len = strlen(ConnectSettings->password);

if (p && ConnectSettings->password[0] == '"' && ConnectSettings->password[len-1] == '"') {

// two passwords -> use second one!

p[0] = 0;

strlcpy(passphrase, ConnectSettings->password + 1, sizeof(passphrase)-1);

View remainder of file in raw view

SFTPplug/src/sftpfunc.cpp at dev · remittor/SFTPplug · GitHub

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