github
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putty
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putty/puttygen.c

723 строки
25 KiB
C
Исходник Ответственный История

/*
* PuTTY key generation front end.
*/
#include <windows.h>
#include <commctrl.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#define PUTTY_DO_GLOBALS
#include "putty.h"
#include "ssh.h"
#include "winstuff.h"
#define WM_DONEKEY (WM_XUSER + 1)
#define DEFAULT_KEYSIZE 1024
/* ----------------------------------------------------------------------
* Progress report code. This is really horrible :-)
*/
#define PHASE1TOTAL 0x10000
#define PHASE2TOTAL 0x10000
#define PHASE3TOTAL 0x04000
#define PHASE1START 0
#define PHASE2START (PHASE1TOTAL)
#define PHASE3START (PHASE1TOTAL + PHASE2TOTAL)
#define TOTALTOTAL (PHASE1TOTAL + PHASE2TOTAL + PHASE3TOTAL)
#define PROGRESSBIGRANGE 65535
#define DIVISOR ((TOTALTOTAL + PROGRESSBIGRANGE - 1) / PROGRESSBIGRANGE)
#define PROGRESSRANGE (TOTALTOTAL / DIVISOR)
struct progress {
unsigned phase1param, phase1current, phase1n;
unsigned phase2param, phase2current, phase2n;
unsigned phase3mult;
HWND progbar;
};
static void progress_update(void *param, int phase, int iprogress) {
struct progress *p = (struct progress *)param;
unsigned progress = iprogress;
int position;
switch (phase) {
case -1:
p->phase1param = 0x10000 + progress;
p->phase1current = 0x10000; p->phase1n = 0;
return;
case -2:
p->phase2param = 0x10000 + progress;
p->phase2current = 0x10000; p->phase2n = 0;
return;
case -3:
p->phase3mult = PHASE3TOTAL / progress;
return;
case 1:
while (p->phase1n < progress) {
p->phase1n++;
p->phase1current *= p->phase1param;
p->phase1current /= 0x10000;
}
position = PHASE1START + 0x10000 - p->phase1current;
break;
case 2:
while (p->phase2n < progress) {
p->phase2n++;
p->phase2current *= p->phase2param;
p->phase2current /= 0x10000;
}
position = PHASE2START + 0x10000 - p->phase2current;
break;
case 3:
position = PHASE3START + progress * p->phase3mult;
break;
}
SendMessage(p->progbar, PBM_SETPOS, position / DIVISOR, 0);
}
extern char ver[];
#define PASSPHRASE_MAXLEN 512
struct PassphraseProcStruct {
char *passphrase;
char *comment;
};
/*
* Dialog-box function for the passphrase box.
*/
static int CALLBACK PassphraseProc(HWND hwnd, UINT msg,
WPARAM wParam, LPARAM lParam) {
static char *passphrase;
struct PassphraseProcStruct *p;
switch (msg) {
case WM_INITDIALOG:
SetForegroundWindow(hwnd);
SetWindowPos (hwnd, HWND_TOP, 0, 0, 0, 0,
SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
p = (struct PassphraseProcStruct *)lParam;
passphrase = p->passphrase;
if (p->comment)
SetDlgItemText(hwnd, 101, p->comment);
*passphrase = 0;
return 0;
case WM_COMMAND:
switch (LOWORD(wParam)) {
case IDOK:
if (*passphrase)
EndDialog (hwnd, 1);
else
MessageBeep (0);
return 0;
case IDCANCEL:
EndDialog (hwnd, 0);
return 0;
case 102: /* edit box */
if (HIWORD(wParam) == EN_CHANGE) {
GetDlgItemText (hwnd, 102, passphrase, PASSPHRASE_MAXLEN-1);
passphrase[PASSPHRASE_MAXLEN-1] = '\0';
}
return 0;
}
return 0;
case WM_CLOSE:
EndDialog (hwnd, 0);
return 0;
}
return 0;
}
/*
* Prompt for a key file. Assumes the filename buffer is of size
* FILENAME_MAX.
*/
static int prompt_keyfile(HWND hwnd, char *dlgtitle,
char *filename, int save) {
OPENFILENAME of;
memset(&of, 0, sizeof(of));
#ifdef OPENFILENAME_SIZE_VERSION_400
of.lStructSize = OPENFILENAME_SIZE_VERSION_400;
#else
of.lStructSize = sizeof(of);
#endif
of.hwndOwner = hwnd;
of.lpstrFilter = "All Files\0*\0\0\0";
of.lpstrCustomFilter = NULL;
of.nFilterIndex = 1;
of.lpstrFile = filename; *filename = '\0';
of.nMaxFile = FILENAME_MAX;
of.lpstrFileTitle = NULL;
of.lpstrInitialDir = NULL;
of.lpstrTitle = dlgtitle;
of.Flags = 0;
if (save)
return GetSaveFileName(&of);
else
return GetOpenFileName(&of);
}
/*
* This function is needed to link with the DES code. We need not
* have it do anything at all.
*/
void logevent(char *msg) {
}
/*
* Dialog-box function for the Licence box.
*/
static int CALLBACK LicenceProc (HWND hwnd, UINT msg,
WPARAM wParam, LPARAM lParam) {
switch (msg) {
case WM_INITDIALOG:
return 1;
case WM_COMMAND:
switch (LOWORD(wParam)) {
case IDOK:
EndDialog(hwnd, 1);
return 0;
}
return 0;
case WM_CLOSE:
EndDialog(hwnd, 1);
return 0;
}
return 0;
}
/*
* Dialog-box function for the About box.
*/
static int CALLBACK AboutProc (HWND hwnd, UINT msg,
WPARAM wParam, LPARAM lParam) {
switch (msg) {
case WM_INITDIALOG:
SetDlgItemText (hwnd, 100, ver);
return 1;
case WM_COMMAND:
switch (LOWORD(wParam)) {
case IDOK:
EndDialog(hwnd, 1);
return 0;
case 101:
EnableWindow(hwnd, 0);
DialogBox (hinst, MAKEINTRESOURCE(214), NULL, LicenceProc);
EnableWindow(hwnd, 1);
SetActiveWindow(hwnd);
return 0;
}
return 0;
case WM_CLOSE:
EndDialog(hwnd, 1);
return 0;
}
return 0;
}
/*
* Thread to generate a key.
*/
struct rsa_key_thread_params {
HWND progressbar; /* notify this with progress */
HWND dialog; /* notify this on completion */
int keysize; /* bits in key */
struct RSAKey *key;
struct RSAAux *aux;
};
static DWORD WINAPI generate_rsa_key_thread(void *param) {
struct rsa_key_thread_params *params =
(struct rsa_key_thread_params *)param;
struct progress prog;
prog.progbar = params->progressbar;
rsa_generate(params->key, params->aux,
params->keysize, progress_update, &prog);
PostMessage(params->dialog, WM_DONEKEY, 0, 0);
free(params);
return 0;
}
struct MainDlgState {
int collecting_entropy;
int generation_thread_exists;
int key_exists;
int entropy_got, entropy_required, entropy_size;
int keysize;
unsigned *entropy;
struct RSAKey key;
struct RSAAux aux;
};
static void hidemany(HWND hwnd, const int *ids, int hideit) {
while (*ids) {
ShowWindow(GetDlgItem(hwnd, *ids++), (hideit ? SW_HIDE : SW_SHOW));
}
}
static void setupbigedit(HWND hwnd, int id, struct RSAKey *key) {
char *buffer;
char *dec1, *dec2;
dec1 = bignum_decimal(key->exponent);
dec2 = bignum_decimal(key->modulus);
buffer = malloc(strlen(dec1)+strlen(dec2)+
strlen(key->comment)+30);
sprintf(buffer, "%d %s %s %s",
ssh1_bignum_bitcount(key->modulus),
dec1, dec2, key->comment);
SetDlgItemText(hwnd, id, buffer);
free(dec1);
free(dec2);
free(buffer);
}
/*
* Dialog-box function for the main PuTTYgen dialog box.
*/
static int CALLBACK MainDlgProc (HWND hwnd, UINT msg,
WPARAM wParam, LPARAM lParam) {
enum {
controlidstart = 100,
IDC_TITLE,
IDC_BOX_KEY, IDC_BOXT_KEY,
IDC_NOKEY,
IDC_GENERATING,
IDC_PROGRESS,
IDC_PKSTATIC, IDC_KEYDISPLAY,
IDC_FPSTATIC, IDC_FINGERPRINT,
IDC_COMMENTSTATIC, IDC_COMMENTEDIT,
IDC_PASSPHRASE1STATIC, IDC_PASSPHRASE1EDIT,
IDC_PASSPHRASE2STATIC, IDC_PASSPHRASE2EDIT,
IDC_BOX_ACTIONS, IDC_BOXT_ACTIONS,
IDC_GENSTATIC, IDC_GENERATE,
IDC_LOADSTATIC, IDC_LOAD,
IDC_SAVESTATIC, IDC_SAVE,
IDC_BOX_PARAMS, IDC_BOXT_PARAMS,
IDC_BITSSTATIC, IDC_BITS,
IDC_ABOUT,
};
static const int nokey_ids[] = { IDC_NOKEY, 0 };
static const int generating_ids[] = { IDC_GENERATING, IDC_PROGRESS, 0 };
static const int gotkey_ids[] = {
IDC_PKSTATIC, IDC_KEYDISPLAY,
IDC_FPSTATIC, IDC_FINGERPRINT,
IDC_COMMENTSTATIC, IDC_COMMENTEDIT,
IDC_PASSPHRASE1STATIC, IDC_PASSPHRASE1EDIT,
IDC_PASSPHRASE2STATIC, IDC_PASSPHRASE2EDIT, 0 };
static const char generating_msg[] =
"Please wait while a key is generated...";
static const char entropy_msg[] =
"Please generate some randomness by moving the mouse over the blank area.";
struct MainDlgState *state;
switch (msg) {
case WM_INITDIALOG:
state = malloc(sizeof(*state));
state->generation_thread_exists = FALSE;
state->collecting_entropy = FALSE;
state->entropy = NULL;
state->key_exists = FALSE;
SetWindowLong(hwnd, GWL_USERDATA, (LONG)state);
{
struct ctlpos cp, cp2;
/* Accelerators used: acglops */
ctlposinit(&cp, hwnd, 10, 10, 10);
bartitle(&cp, "Public and private key generation for PuTTY",
IDC_TITLE);
beginbox(&cp, "Key",
IDC_BOX_KEY, IDC_BOXT_KEY);
cp2 = cp;
statictext(&cp2, "No key.", IDC_NOKEY);
cp2 = cp;
statictext(&cp2, "",
IDC_GENERATING);
progressbar(&cp2, IDC_PROGRESS);
bigeditctrl(&cp,
"&Public key for pasting into authorized_keys file:",
IDC_PKSTATIC, IDC_KEYDISPLAY, 7);
SendDlgItemMessage(hwnd, IDC_KEYDISPLAY, EM_SETREADONLY, 1, 0);
staticedit(&cp, "Key fingerprint:", IDC_FPSTATIC,
IDC_FINGERPRINT, 70);
SendDlgItemMessage(hwnd, IDC_FINGERPRINT, EM_SETREADONLY, 1, 0);
staticedit(&cp, "Key &comment:", IDC_COMMENTSTATIC,
IDC_COMMENTEDIT, 70);
staticpassedit(&cp, "Key p&assphrase:", IDC_PASSPHRASE1STATIC,
IDC_PASSPHRASE1EDIT, 70);
staticpassedit(&cp, "C&onfirm passphrase:", IDC_PASSPHRASE2STATIC,
IDC_PASSPHRASE2EDIT, 70);
endbox(&cp);
beginbox(&cp, "Actions",
IDC_BOX_ACTIONS, IDC_BOXT_ACTIONS);
staticbtn(&cp, "Generate a public/private key pair",
IDC_GENSTATIC, "&Generate", IDC_GENERATE);
staticbtn(&cp, "Load an existing private key file",
IDC_LOADSTATIC, "&Load", IDC_LOAD);
staticbtn(&cp, "Save the generated key to a new file",
IDC_SAVESTATIC, "&Save", IDC_SAVE);
endbox(&cp);
beginbox(&cp, "Parameters",
IDC_BOX_PARAMS, IDC_BOXT_PARAMS);
staticedit(&cp, "Number of &bits in a generated key:",
IDC_BITSSTATIC, IDC_BITS, 20);
endbox(&cp);
}
SetDlgItemInt(hwnd, IDC_BITS, DEFAULT_KEYSIZE, FALSE);
/*
* Initially, hide the progress bar and the key display,
* and show the no-key display. Also disable the Save
* button, because with no key we obviously can't save
* anything.
*/
hidemany(hwnd, nokey_ids, FALSE);
hidemany(hwnd, generating_ids, TRUE);
hidemany(hwnd, gotkey_ids, TRUE);
EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 0);
return 1;
case WM_MOUSEMOVE:
state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
if (state->collecting_entropy &&
state->entropy &&
state->entropy_got < state->entropy_required) {
state->entropy[state->entropy_got++] = lParam;
state->entropy[state->entropy_got++] = GetMessageTime();
SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS,
state->entropy_got, 0);
if (state->entropy_got >= state->entropy_required) {
struct rsa_key_thread_params *params;
DWORD threadid;
/*
* Seed the entropy pool
*/
random_add_heavynoise(state->entropy, state->entropy_size);
memset(state->entropy, 0, state->entropy_size);
free(state->entropy);
state->collecting_entropy = FALSE;
SetDlgItemText(hwnd, IDC_GENERATING, generating_msg);
SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETRANGE, 0,
MAKELPARAM(0, PROGRESSRANGE));
SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, 0, 0);
params = malloc(sizeof(*params));
params->progressbar = GetDlgItem(hwnd, IDC_PROGRESS);
params->dialog = hwnd;
params->keysize = state->keysize;
params->key = &state->key;
params->aux = &state->aux;
if (!CreateThread(NULL, 0, generate_rsa_key_thread,
params, 0, &threadid)) {
MessageBox(hwnd, "Out of thread resources",
"Key generation error",
MB_OK | MB_ICONERROR);
free(params);
} else {
state->generation_thread_exists = TRUE;
}
}
}
break;
case WM_COMMAND:
switch (LOWORD(wParam)) {
case IDC_COMMENTEDIT:
if (HIWORD(wParam) == EN_CHANGE) {
state = (struct MainDlgState *)
GetWindowLong(hwnd, GWL_USERDATA);
if (state->key_exists) {
HWND editctl = GetDlgItem(hwnd, IDC_COMMENTEDIT);
int len = GetWindowTextLength(editctl);
if (state->key.comment)
free(state->key.comment);
state->key.comment = malloc(len+1);
GetWindowText(editctl, state->key.comment, len+1);
}
}
break;
case IDC_ABOUT:
EnableWindow(hwnd, 0);
DialogBox (hinst, MAKEINTRESOURCE(213), NULL, AboutProc);
EnableWindow(hwnd, 1);
SetActiveWindow(hwnd);
return 0;
case IDC_GENERATE:
state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
if (!state->generation_thread_exists) {
BOOL ok;
state->keysize = GetDlgItemInt(hwnd, IDC_BITS,
&ok, FALSE);
if (!ok) state->keysize = DEFAULT_KEYSIZE;
if (state->keysize < 256) {
int ret = MessageBox(hwnd,
"PuTTYgen will not generate a key"
" smaller than 256 bits.\n"
"Key length reset to 256. Continue?",
"PuTTYgen Warning",
MB_ICONWARNING | MB_OKCANCEL);
if (ret != IDOK)
break;
state->keysize = 256;
SetDlgItemInt(hwnd, IDC_BITS, 256, FALSE);
}
hidemany(hwnd, nokey_ids, TRUE);
hidemany(hwnd, generating_ids, FALSE);
hidemany(hwnd, gotkey_ids, TRUE);
EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 0);
EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 0);
EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 0);
state->key_exists = FALSE;
SetDlgItemText(hwnd, IDC_GENERATING, entropy_msg);
state->collecting_entropy = TRUE;
/*
* My brief statistical tests on mouse movements
* suggest that there are about 2.5 bits of
* randomness in the x position, 2.5 in the y
* position, and 1.7 in the message time, making
* 5.7 bits of unpredictability per mouse movement.
* However, other people have told me it's far less
* than that, so I'm going to be stupidly cautious
* and knock that down to a nice round 2. With this
* method, we require two words per mouse movement,
* so with 2 bits per mouse movement we expect 2
* bits every 2 words.
*/
state->entropy_required = (state->keysize/2) * 2;
state->entropy_got = 0;
state->entropy_size = (state->entropy_required *
sizeof(*state->entropy));
state->entropy = malloc(state->entropy_size);
SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETRANGE, 0,
MAKELPARAM(0, state->entropy_required));
SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, 0, 0);
}
break;
case IDC_SAVE:
state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
if (state->key_exists) {
char filename[FILENAME_MAX];
char passphrase[PASSPHRASE_MAXLEN];
char passphrase2[PASSPHRASE_MAXLEN];
GetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT,
passphrase, sizeof(passphrase));
GetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT,
passphrase2, sizeof(passphrase2));
if (strcmp(passphrase, passphrase2)) {
MessageBox(hwnd,
"The two passphrases given do not match.",
"PuTTYgen Error",
MB_OK | MB_ICONERROR);
break;
}
if (!*passphrase) {
int ret;
ret = MessageBox(hwnd,
"Are you sure you want to save this key\n"
"without a passphrase to protect it?",
"PuTTYgen Warning",
MB_YESNO | MB_ICONWARNING);
if (ret != IDYES)
break;
}
if (prompt_keyfile(hwnd, "Save private key as:",
filename, 1)) {
int ret;
FILE *fp = fopen(filename, "r");
if (fp) {
char buffer[FILENAME_MAX+80];
fclose(fp);
sprintf(buffer, "Overwrite existing file\n%.*s?",
FILENAME_MAX, filename);
ret = MessageBox(hwnd, buffer, "PuTTYgen Warning",
MB_YESNO | MB_ICONWARNING);
if (ret != IDYES)
break;
}
ret = saversakey(filename, &state->key, &state->aux,
*passphrase ? passphrase : NULL);
if (ret <= 0) {
MessageBox(hwnd, "Unable to save key file",
"PuTTYgen Error",
MB_OK | MB_ICONERROR);
}
}
}
break;
case IDC_LOAD:
state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
if (!state->generation_thread_exists) {
char filename[FILENAME_MAX];
if (prompt_keyfile(hwnd, "Load private key:",
filename, 0)) {
char passphrase[PASSPHRASE_MAXLEN];
int needs_pass;
int ret;
char *comment;
struct PassphraseProcStruct pps;
struct RSAKey newkey;
struct RSAAux newaux;
needs_pass = rsakey_encrypted(filename, &comment);
pps.passphrase = passphrase;
pps.comment = comment;
do {
if (needs_pass) {
int dlgret;
dlgret = DialogBoxParam(hinst,
MAKEINTRESOURCE(210),
NULL, PassphraseProc,
(LPARAM)&pps);
if (!dlgret) {
ret = -2;
break;
}
} else
*passphrase = '\0';
ret = loadrsakey(filename, &newkey, &newaux,
passphrase);
} while (ret == -1);
if (comment) free(comment);
if (ret == 0) {
MessageBox(NULL, "Couldn't load private key.",
"PuTTYgen Error", MB_OK | MB_ICONERROR);
} else if (ret == 1) {
state->key = newkey;
state->aux = newaux;
EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 1);
EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 1);
EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 1);
/*
* Now update the key controls with all the
* key data.
*/
{
char buf[128];
SetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT,
passphrase);
SetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT,
passphrase);
SetDlgItemText(hwnd, IDC_COMMENTEDIT,
state->key.comment);
/*
* Set the key fingerprint.
*/
{
char *savecomment = state->key.comment;
state->key.comment = NULL;
rsa_fingerprint(buf, sizeof(buf), &state->key);
state->key.comment = savecomment;
}
SetDlgItemText(hwnd, IDC_FINGERPRINT, buf);
/*
* Construct a decimal representation
* of the key, for pasting into
* .ssh/authorized_keys on a Unix box.
*/
setupbigedit(hwnd, IDC_KEYDISPLAY, &state->key);
}
/*
* Finally, hide the progress bar and show
* the key data.
*/
hidemany(hwnd, nokey_ids, TRUE);
hidemany(hwnd, generating_ids, TRUE);
hidemany(hwnd, gotkey_ids, FALSE);
state->key_exists = TRUE;
}
}
}
break;
}
return 0;
case WM_DONEKEY:
state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
state->generation_thread_exists = FALSE;
state->key_exists = TRUE;
SendDlgItemMessage(hwnd, IDC_PROGRESS, PBM_SETPOS, PROGRESSRANGE, 0);
EnableWindow(GetDlgItem(hwnd, IDC_GENERATE), 1);
EnableWindow(GetDlgItem(hwnd, IDC_LOAD), 1);
EnableWindow(GetDlgItem(hwnd, IDC_SAVE), 1);
/*
* Invent a comment for the key. We'll do this by including
* the date in it. This will be so horrifyingly ugly that
* the user will immediately want to change it, which is
* what we want :-)
*/
state->key.comment = malloc(30);
{
time_t t;
struct tm *tm;
time(&t);
tm = localtime(&t);
strftime(state->key.comment, 30, "rsa-key-%Y%m%d", tm);
}
/*
* Now update the key controls with all the key data.
*/
{
char buf[128];
/*
* Blank passphrase, initially. This isn't dangerous,
* because we will warn (Are You Sure?) before allowing
* the user to save an unprotected private key.
*/
SetDlgItemText(hwnd, IDC_PASSPHRASE1EDIT, "");
SetDlgItemText(hwnd, IDC_PASSPHRASE2EDIT, "");
/*
* Set the comment.
*/
SetDlgItemText(hwnd, IDC_COMMENTEDIT, state->key.comment);
/*
* Set the key fingerprint.
*/
{
char *savecomment = state->key.comment;
state->key.comment = NULL;
rsa_fingerprint(buf, sizeof(buf), &state->key);
state->key.comment = savecomment;
}
SetDlgItemText(hwnd, IDC_FINGERPRINT, buf);
/*
* Construct a decimal representation of the key, for
* pasting into .ssh/authorized_keys on a Unix box.
*/
setupbigedit(hwnd, IDC_KEYDISPLAY, &state->key);
}
/*
* Finally, hide the progress bar and show the key data.
*/
hidemany(hwnd, nokey_ids, TRUE);
hidemany(hwnd, generating_ids, TRUE);
hidemany(hwnd, gotkey_ids, FALSE);
break;
case WM_CLOSE:
state = (struct MainDlgState *)GetWindowLong(hwnd, GWL_USERDATA);
free(state);
EndDialog(hwnd, 1);
return 0;
}
return 0;
}
int WINAPI WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmdline, int show) {
InitCommonControls();
hinst = inst;
random_init();
return DialogBox(hinst, MAKEINTRESOURCE(201), NULL, MainDlgProc) != IDOK;
}
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