2 * Pageant: the PuTTY Authentication Agent.
6 #include <stdio.h> /* FIXME */
7 #include "putty.h" /* FIXME */
11 #define IDI_MAINICON 200
12 #define IDI_TRAYICON 201
14 #define WM_XUSER (WM_USER + 0x2000)
15 #define WM_SYSTRAY (WM_XUSER + 6)
16 #define WM_SYSTRAY2 (WM_XUSER + 7)
17 #define WM_CLOSEMEM (WM_XUSER + 10)
19 #define IDM_CLOSE 0x0010
20 #define IDM_VIEWKEYS 0x0020
22 #define APPNAME "Pageant"
24 #define SSH_AGENTC_REQUEST_RSA_IDENTITIES 1
25 #define SSH_AGENT_RSA_IDENTITIES_ANSWER 2
26 #define SSH_AGENTC_RSA_CHALLENGE 3
27 #define SSH_AGENT_RSA_RESPONSE 4
28 #define SSH_AGENT_FAILURE 5
29 #define SSH_AGENT_SUCCESS 6
30 #define SSH_AGENTC_ADD_RSA_IDENTITY 7
31 #define SSH_AGENTC_REMOVE_RSA_IDENTITY 8
41 * We need this to link with the RSA code, because rsaencrypt()
42 * pads its data with random bytes. Since we only use rsadecrypt(),
43 * which is deterministic, this should never be called.
45 * If it _is_ called, there is a _serious_ problem, because it
46 * won't generate true random numbers. So we must scream, panic,
47 * and exit immediately if that should happen.
49 int random_byte(void) {
50 MessageBox(hwnd
, "Internal Error", APPNAME
, MB_OK
| MB_ICONERROR
);
55 * This function is needed to link with the DES code. We need not
56 * have it do anything at all.
58 void logevent(char *msg
) {
61 #define GET_32BIT(cp) \
62 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
63 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
64 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
65 ((unsigned long)(unsigned char)(cp)[3]))
67 #define PUT_32BIT(cp, value) { \
68 (cp)[0] = (unsigned char)((value) >> 24); \
69 (cp)[1] = (unsigned char)((value) >> 16); \
70 (cp)[2] = (unsigned char)((value) >> 8); \
71 (cp)[3] = (unsigned char)(value); }
73 #define PASSPHRASE_MAXLEN 512
76 * Dialog-box function for the passphrase box.
78 static int CALLBACK
PassphraseProc(HWND hwnd
, UINT msg
,
79 WPARAM wParam
, LPARAM lParam
) {
80 static char *passphrase
;
84 passphrase
= (char *)lParam
;
88 switch (LOWORD(wParam
)) {
98 case 102: /* edit box */
99 if (HIWORD(wParam
) == EN_CHANGE
) {
100 GetDlgItemText (hwnd
, 102, passphrase
, PASSPHRASE_MAXLEN
-1);
101 passphrase
[PASSPHRASE_MAXLEN
-1] = '\0';
114 * This function loads a key from a file and adds it.
116 void add_keyfile(char *filename
) {
117 char passphrase
[PASSPHRASE_MAXLEN
];
123 needs_pass
= rsakey_encrypted(filename
);
125 key
= malloc(sizeof(*key
));
129 dlgret
= DialogBoxParam(instance
, MAKEINTRESOURCE(210),
130 NULL
, PassphraseProc
,
134 return; /* operation cancelled */
138 ret
= loadrsakey(filename
, key
, passphrase
);
142 MessageBox(NULL
, "Couldn't load public key.", APPNAME
,
143 MB_OK
| MB_ICONERROR
);
147 if (add234(rsakeys
, key
) != key
)
148 free(key
); /* already present, don't waste RAM */
152 * This is the main agent function that answers messages.
154 void answer_msg(void *in
, int inlen
, void **out
, int *outlen
) {
156 unsigned char *p
= in
;
159 *out
= NULL
; /* default `no go' response */
162 * Basic sanity checks. len >= 5, and len[0:4] holds len-4.
164 if (inlen
< 5 || GET_32BIT(p
) != (unsigned long)(inlen
-4))
168 * Get the message type.
175 case SSH_AGENTC_REQUEST_RSA_IDENTITIES
:
177 * Reply with SSH_AGENT_RSA_IDENTITIES_ANSWER.
185 * Count up the number and length of keys we hold.
188 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
190 len
+= 4; /* length field */
191 len
+= ssh1_bignum_length(key
->exponent
);
192 len
+= ssh1_bignum_length(key
->modulus
);
193 len
+= 4 + strlen(key
->comment
);
197 * Packet header is the obvious five bytes, plus four
198 * bytes for the key count.
201 if ((ret
= malloc(len
)) != NULL
) {
202 PUT_32BIT(ret
, len
-4);
203 ret
[4] = SSH_AGENT_RSA_IDENTITIES_ANSWER
;
204 PUT_32BIT(ret
+5, nkeys
);
206 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
207 PUT_32BIT(p
, ssh1_bignum_bitcount(key
->modulus
));
209 p
+= ssh1_write_bignum(p
, key
->exponent
);
210 p
+= ssh1_write_bignum(p
, key
->modulus
);
211 PUT_32BIT(p
, strlen(key
->comment
));
212 memcpy(p
+4, key
->comment
, strlen(key
->comment
));
213 p
+= 4 + strlen(key
->comment
);
218 case SSH_AGENTC_RSA_CHALLENGE
:
220 * Reply with either SSH_AGENT_RSA_RESPONSE or
221 * SSH_AGENT_FAILURE, depending on whether we have that key
225 struct RSAKey reqkey
, *key
;
226 Bignum challenge
, response
;
227 unsigned char response_source
[48], response_md5
[16];
228 struct MD5Context md5c
;
232 p
+= ssh1_read_bignum(p
, &reqkey
.exponent
);
233 p
+= ssh1_read_bignum(p
, &reqkey
.modulus
);
234 p
+= ssh1_read_bignum(p
, &challenge
);
235 memcpy(response_source
+32, p
, 16); p
+= 16;
236 if (GET_32BIT(p
) != 1 ||
237 (key
= find234(rsakeys
, &reqkey
, NULL
)) == NULL
) {
238 freebn(reqkey
.exponent
);
239 freebn(reqkey
.modulus
);
243 response
= rsadecrypt(challenge
, key
);
244 for (i
= 0; i
< 32; i
++)
245 response_source
[i
] = bignum_byte(response
, 31-i
);
248 MD5Update(&md5c
, response_source
, 48);
249 MD5Final(response_md5
, &md5c
);
250 memset(response_source
, 0, 48); /* burn the evidence */
251 freebn(response
); /* and that evidence */
252 freebn(challenge
); /* yes, and that evidence */
253 freebn(reqkey
.exponent
); /* and free some memory ... */
254 freebn(reqkey
.modulus
); /* ... while we're at it. */
257 * Packet is the obvious five byte header, plus sixteen
261 if ((ret
= malloc(len
)) != NULL
) {
262 PUT_32BIT(ret
, len
-4);
263 ret
[4] = SSH_AGENT_RSA_RESPONSE
;
264 memcpy(ret
+5, response_md5
, 16);
268 #if 0 /* FIXME: implement these */
269 case SSH_AGENTC_ADD_RSA_IDENTITY
:
271 * Add to the list and return SSH_AGENT_SUCCESS, or
272 * SSH_AGENT_FAILURE if the key was malformed.
275 case SSH_AGENTC_REMOVE_RSA_IDENTITY
:
277 * Remove from the list and return SSH_AGENT_SUCCESS, or
278 * perhaps SSH_AGENT_FAILURE if it wasn't in the list to
286 * Unrecognised message. Return SSH_AGENT_FAILURE.
288 if ((ret
= malloc(5)) != NULL
) {
290 ret
[4] = SSH_AGENT_FAILURE
;
297 *outlen
= 4 + GET_32BIT(ret
);
302 * Key comparison function for the 2-3-4 tree of RSA keys.
304 int cmpkeys(void *av
, void *bv
) {
305 struct RSAKey
*a
= (struct RSAKey
*)av
;
306 struct RSAKey
*b
= (struct RSAKey
*)bv
;
313 * Compare by length of moduli.
315 alen
= ssh1_bignum_bitcount(am
);
316 blen
= ssh1_bignum_bitcount(bm
);
317 if (alen
> blen
) return +1; else if (alen
< blen
) return -1;
319 * Now compare by moduli themselves.
321 alen
= (alen
+ 7) / 8; /* byte count */
324 abyte
= bignum_byte(am
, alen
);
325 bbyte
= bignum_byte(bm
, alen
);
326 if (abyte
> bbyte
) return +1; else if (abyte
< bbyte
) return -1;
334 static void error(char *s
) {
335 MessageBox(hwnd
, s
, APPNAME
, MB_OK
| MB_ICONERROR
);
339 * Dialog-box function for the key list box.
341 static int CALLBACK
KeyListProc(HWND hwnd
, UINT msg
,
342 WPARAM wParam
, LPARAM lParam
) {
346 char filename
[FILENAME_MAX
];
350 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
351 SendDlgItemMessage (hwnd
, 100, LB_ADDSTRING
,
352 0, (LPARAM
) key
->comment
);
356 switch (LOWORD(wParam
)) {
362 case 101: /* add key */
363 if (HIWORD(wParam
) == BN_CLICKED
||
364 HIWORD(wParam
) == BN_DOUBLECLICKED
) {
365 memset(&of
, 0, sizeof(of
));
366 #ifdef OPENFILENAME_SIZE_VERSION_400
367 of
.lStructSize
= OPENFILENAME_SIZE_VERSION_400
;
369 of
.lStructSize
= sizeof(of
);
372 of
.lpstrFilter
= "All Files\0*\0\0\0";
373 of
.lpstrCustomFilter
= NULL
;
375 of
.lpstrFile
= filename
; *filename
= '\0';
376 of
.nMaxFile
= sizeof(filename
);
377 of
.lpstrFileTitle
= NULL
;
378 of
.lpstrInitialDir
= NULL
;
379 of
.lpstrTitle
= "Select Public Key File";
381 if (GetOpenFileName(&of
)) {
382 add_keyfile(filename
);
384 SendDlgItemMessage(hwnd
, 100, LB_RESETCONTENT
, 0, 0);
385 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
386 SendDlgItemMessage (hwnd
, 100, LB_ADDSTRING
,
387 0, (LPARAM
) key
->comment
);
389 SendDlgItemMessage (hwnd
, 100, LB_SETCURSEL
, (WPARAM
) -1, 0);
392 case 102: /* remove key */
393 if (HIWORD(wParam
) == BN_CLICKED
||
394 HIWORD(wParam
) == BN_DOUBLECLICKED
) {
395 int n
= SendDlgItemMessage (hwnd
, 100, LB_GETCURSEL
, 0, 0);
396 if (n
== LB_ERR
|| n
== 0) {
400 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
))
403 del234(rsakeys
, key
);
404 freersakey(key
); free(key
);
405 SendDlgItemMessage(hwnd
, 100, LB_RESETCONTENT
, 0, 0);
406 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
407 SendDlgItemMessage (hwnd
, 100, LB_ADDSTRING
,
408 0, (LPARAM
) key
->comment
);
410 SendDlgItemMessage (hwnd
, 100, LB_SETCURSEL
, (WPARAM
) -1, 0);
423 static LRESULT CALLBACK
WndProc (HWND hwnd
, UINT message
,
424 WPARAM wParam
, LPARAM lParam
) {
426 static int menuinprogress
;
430 if (lParam
== WM_RBUTTONUP
) {
432 GetCursorPos(&cursorpos
);
433 PostMessage(hwnd
, WM_SYSTRAY2
, cursorpos
.x
, cursorpos
.y
);
437 if (!menuinprogress
) {
439 SetForegroundWindow(hwnd
);
440 ret
= TrackPopupMenu(systray_menu
,
441 TPM_RIGHTALIGN
| TPM_BOTTOMALIGN
|
443 wParam
, lParam
, 0, hwnd
, NULL
);
449 switch (wParam
& ~0xF) { /* low 4 bits reserved to Windows */
451 SendMessage(hwnd
, WM_CLOSE
, 0, 0);
455 keylist
= CreateDialog (instance
, MAKEINTRESOURCE(211),
457 ShowWindow (keylist
, SW_SHOWNORMAL
);
468 void *in
, *out
, *ret
;
474 cds
= (COPYDATASTRUCT
*)lParam
;
476 * FIXME: use dwData somehow.
480 answer_msg(in
, inlen
, &out
, &outlen
);
484 sprintf(mapname
, "PageantReply%08x", ++id
);
485 filemap
= CreateFileMapping(INVALID_HANDLE_VALUE
,
486 NULL
, PAGE_READWRITE
,
487 0, outlen
+sizeof(int),
489 } while (filemap
== INVALID_HANDLE_VALUE
);
490 ret
= MapViewOfFile(filemap
, FILE_MAP_WRITE
, 0, 0,
493 *((int *)ret
) = outlen
;
494 memcpy(((int *)ret
)+1, out
, outlen
);
495 UnmapViewOfFile(ret
);
499 return 0; /* invalid request */
509 return DefWindowProc (hwnd
, message
, wParam
, lParam
);
512 int WINAPI
WinMain(HINSTANCE inst
, HINSTANCE prev
, LPSTR cmdline
, int show
) {
520 wndclass
.lpfnWndProc
= WndProc
;
521 wndclass
.cbClsExtra
= 0;
522 wndclass
.cbWndExtra
= 0;
523 wndclass
.hInstance
= inst
;
524 wndclass
.hIcon
= LoadIcon (inst
,
525 MAKEINTRESOURCE(IDI_MAINICON
));
526 wndclass
.hCursor
= LoadCursor (NULL
, IDC_IBEAM
);
527 wndclass
.hbrBackground
= GetStockObject (BLACK_BRUSH
);
528 wndclass
.lpszMenuName
= NULL
;
529 wndclass
.lpszClassName
= APPNAME
;
531 RegisterClass (&wndclass
);
534 hwnd
= keylist
= NULL
;
536 hwnd
= CreateWindow (APPNAME
, APPNAME
,
537 WS_OVERLAPPEDWINDOW
| WS_VSCROLL
,
538 CW_USEDEFAULT
, CW_USEDEFAULT
,
539 100, 100, NULL
, NULL
, inst
, NULL
);
541 /* Set up a system tray icon */
547 #ifdef NIM_SETVERSION
549 res
= Shell_NotifyIcon(NIM_SETVERSION
, &tnid
);
552 tnid
.cbSize
= sizeof(NOTIFYICONDATA
);
554 tnid
.uID
= 1; /* unique within this systray use */
555 tnid
.uFlags
= NIF_MESSAGE
| NIF_ICON
| NIF_TIP
;
556 tnid
.uCallbackMessage
= WM_SYSTRAY
;
557 tnid
.hIcon
= hicon
= LoadIcon (instance
, MAKEINTRESOURCE(201));
558 strcpy(tnid
.szTip
, "Pageant (PuTTY authentication agent)");
560 res
= Shell_NotifyIcon(NIM_ADD
, &tnid
);
565 systray_menu
= CreatePopupMenu();
566 AppendMenu (systray_menu
, MF_ENABLED
, IDM_VIEWKEYS
, "View Keys");
567 AppendMenu (systray_menu
, MF_ENABLED
, IDM_CLOSE
, "Terminate");
570 ShowWindow (hwnd
, SW_HIDE
);
573 * Initialise storage for RSA keys.
575 rsakeys
= newtree234(cmpkeys
);
578 * Process the command line and add RSA keys as listed on it.
579 * FIXME: we don't support spaces in filenames here. We should.
584 while (*p
&& isspace(*p
)) p
++;
585 if (*p
&& !isspace(*p
)) {
587 while (*p
&& !isspace(*p
)) p
++;
597 while (GetMessage(&msg
, NULL
, 0, 0) == 1) {
598 TranslateMessage(&msg
);
599 DispatchMessage(&msg
);
602 /* Clean up the system tray icon */
606 tnid
.cbSize
= sizeof(NOTIFYICONDATA
);
610 Shell_NotifyIcon(NIM_DELETE
, &tnid
);
612 DestroyMenu(systray_menu
);