2 * Pageant: the PuTTY Authentication Agent.
7 #include <stdio.h> /* FIXME */
8 #include "putty.h" /* FIXME */
12 #define IDI_MAINICON 200
13 #define IDI_TRAYICON 201
15 #define WM_XUSER (WM_USER + 0x2000)
16 #define WM_SYSTRAY (WM_XUSER + 6)
17 #define WM_SYSTRAY2 (WM_XUSER + 7)
19 #define AGENT_COPYDATA_ID 0x804e50ba /* random goop */
22 * FIXME: maybe some day we can sort this out ...
24 #define AGENT_MAX_MSGLEN 8192
26 #define IDM_CLOSE 0x0010
27 #define IDM_VIEWKEYS 0x0020
29 #define APPNAME "Pageant"
31 #define SSH_AGENTC_REQUEST_RSA_IDENTITIES 1
32 #define SSH_AGENT_RSA_IDENTITIES_ANSWER 2
33 #define SSH_AGENTC_RSA_CHALLENGE 3
34 #define SSH_AGENT_RSA_RESPONSE 4
35 #define SSH_AGENT_FAILURE 5
36 #define SSH_AGENT_SUCCESS 6
37 #define SSH_AGENTC_ADD_RSA_IDENTITY 7
38 #define SSH_AGENTC_REMOVE_RSA_IDENTITY 8
48 * We need this to link with the RSA code, because rsaencrypt()
49 * pads its data with random bytes. Since we only use rsadecrypt(),
50 * which is deterministic, this should never be called.
52 * If it _is_ called, there is a _serious_ problem, because it
53 * won't generate true random numbers. So we must scream, panic,
54 * and exit immediately if that should happen.
56 int random_byte(void) {
57 MessageBox(hwnd
, "Internal Error", APPNAME
, MB_OK
| MB_ICONERROR
);
62 * This function is needed to link with the DES code. We need not
63 * have it do anything at all.
65 void logevent(char *msg
) {
68 #define GET_32BIT(cp) \
69 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
70 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
71 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
72 ((unsigned long)(unsigned char)(cp)[3]))
74 #define PUT_32BIT(cp, value) { \
75 (cp)[0] = (unsigned char)((value) >> 24); \
76 (cp)[1] = (unsigned char)((value) >> 16); \
77 (cp)[2] = (unsigned char)((value) >> 8); \
78 (cp)[3] = (unsigned char)(value); }
80 #define PASSPHRASE_MAXLEN 512
83 * Dialog-box function for the passphrase box.
85 static int CALLBACK
PassphraseProc(HWND hwnd
, UINT msg
,
86 WPARAM wParam
, LPARAM lParam
) {
87 static char *passphrase
;
91 passphrase
= (char *)lParam
;
95 switch (LOWORD(wParam
)) {
105 case 102: /* edit box */
106 if (HIWORD(wParam
) == EN_CHANGE
) {
107 GetDlgItemText (hwnd
, 102, passphrase
, PASSPHRASE_MAXLEN
-1);
108 passphrase
[PASSPHRASE_MAXLEN
-1] = '\0';
121 * This function loads a key from a file and adds it.
123 void add_keyfile(char *filename
) {
124 char passphrase
[PASSPHRASE_MAXLEN
];
130 /* FIXME: we can acquire comment here and use it in dialog */
131 needs_pass
= rsakey_encrypted(filename
, NULL
);
133 key
= malloc(sizeof(*key
));
137 dlgret
= DialogBoxParam(instance
, MAKEINTRESOURCE(210),
138 NULL
, PassphraseProc
,
142 return; /* operation cancelled */
146 ret
= loadrsakey(filename
, key
, passphrase
);
150 MessageBox(NULL
, "Couldn't load public key.", APPNAME
,
151 MB_OK
| MB_ICONERROR
);
155 if (add234(rsakeys
, key
) != key
)
156 free(key
); /* already present, don't waste RAM */
160 * This is the main agent function that answers messages.
162 void answer_msg(void *msg
) {
163 unsigned char *p
= msg
;
164 unsigned char *ret
= msg
;
168 * Get the message type.
174 case SSH_AGENTC_REQUEST_RSA_IDENTITIES
:
176 * Reply with SSH_AGENT_RSA_IDENTITIES_ANSWER.
184 * Count up the number and length of keys we hold.
187 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
189 len
+= 4; /* length field */
190 len
+= ssh1_bignum_length(key
->exponent
);
191 len
+= ssh1_bignum_length(key
->modulus
);
192 len
+= 4 + strlen(key
->comment
);
196 * Packet header is the obvious five bytes, plus four
197 * bytes for the key count.
200 if (len
> AGENT_MAX_MSGLEN
)
201 goto failure
; /* aaargh! too much stuff! */
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
);
217 case SSH_AGENTC_RSA_CHALLENGE
:
219 * Reply with either SSH_AGENT_RSA_RESPONSE or
220 * SSH_AGENT_FAILURE, depending on whether we have that key
224 struct RSAKey reqkey
, *key
;
225 Bignum challenge
, response
;
226 unsigned char response_source
[48], response_md5
[16];
227 struct MD5Context md5c
;
231 p
+= ssh1_read_bignum(p
, &reqkey
.exponent
);
232 p
+= ssh1_read_bignum(p
, &reqkey
.modulus
);
233 p
+= ssh1_read_bignum(p
, &challenge
);
234 memcpy(response_source
+32, p
, 16); p
+= 16;
235 if (GET_32BIT(p
) != 1 ||
236 (key
= find234(rsakeys
, &reqkey
, NULL
)) == NULL
) {
237 freebn(reqkey
.exponent
);
238 freebn(reqkey
.modulus
);
242 response
= rsadecrypt(challenge
, key
);
243 for (i
= 0; i
< 32; i
++)
244 response_source
[i
] = bignum_byte(response
, 31-i
);
247 MD5Update(&md5c
, response_source
, 48);
248 MD5Final(response_md5
, &md5c
);
249 memset(response_source
, 0, 48); /* burn the evidence */
250 freebn(response
); /* and that evidence */
251 freebn(challenge
); /* yes, and that evidence */
252 freebn(reqkey
.exponent
); /* and free some memory ... */
253 freebn(reqkey
.modulus
); /* ... while we're at it. */
256 * Packet is the obvious five byte header, plus sixteen
260 PUT_32BIT(ret
, len
-4);
261 ret
[4] = SSH_AGENT_RSA_RESPONSE
;
262 memcpy(ret
+5, response_md5
, 16);
265 #if 0 /* FIXME: implement these */
266 case SSH_AGENTC_ADD_RSA_IDENTITY
:
268 * Add to the list and return SSH_AGENT_SUCCESS, or
269 * SSH_AGENT_FAILURE if the key was malformed.
272 case SSH_AGENTC_REMOVE_RSA_IDENTITY
:
274 * Remove from the list and return SSH_AGENT_SUCCESS, or
275 * perhaps SSH_AGENT_FAILURE if it wasn't in the list to
283 * Unrecognised message. Return SSH_AGENT_FAILURE.
286 ret
[4] = SSH_AGENT_FAILURE
;
292 * Key comparison function for the 2-3-4 tree of RSA keys.
294 int cmpkeys(void *av
, void *bv
) {
295 struct RSAKey
*a
= (struct RSAKey
*)av
;
296 struct RSAKey
*b
= (struct RSAKey
*)bv
;
303 * Compare by length of moduli.
305 alen
= ssh1_bignum_bitcount(am
);
306 blen
= ssh1_bignum_bitcount(bm
);
307 if (alen
> blen
) return +1; else if (alen
< blen
) return -1;
309 * Now compare by moduli themselves.
311 alen
= (alen
+ 7) / 8; /* byte count */
314 abyte
= bignum_byte(am
, alen
);
315 bbyte
= bignum_byte(bm
, alen
);
316 if (abyte
> bbyte
) return +1; else if (abyte
< bbyte
) return -1;
324 static void error(char *s
) {
325 MessageBox(hwnd
, s
, APPNAME
, MB_OK
| MB_ICONERROR
);
329 * Dialog-box function for the key list box.
331 static int CALLBACK
KeyListProc(HWND hwnd
, UINT msg
,
332 WPARAM wParam
, LPARAM lParam
) {
336 char filename
[FILENAME_MAX
];
340 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
341 SendDlgItemMessage (hwnd
, 100, LB_ADDSTRING
,
342 0, (LPARAM
) key
->comment
);
346 switch (LOWORD(wParam
)) {
352 case 101: /* add key */
353 if (HIWORD(wParam
) == BN_CLICKED
||
354 HIWORD(wParam
) == BN_DOUBLECLICKED
) {
355 memset(&of
, 0, sizeof(of
));
356 #ifdef OPENFILENAME_SIZE_VERSION_400
357 of
.lStructSize
= OPENFILENAME_SIZE_VERSION_400
;
359 of
.lStructSize
= sizeof(of
);
362 of
.lpstrFilter
= "All Files\0*\0\0\0";
363 of
.lpstrCustomFilter
= NULL
;
365 of
.lpstrFile
= filename
; *filename
= '\0';
366 of
.nMaxFile
= sizeof(filename
);
367 of
.lpstrFileTitle
= NULL
;
368 of
.lpstrInitialDir
= NULL
;
369 of
.lpstrTitle
= "Select Public Key File";
371 if (GetOpenFileName(&of
)) {
372 add_keyfile(filename
);
374 SendDlgItemMessage(hwnd
, 100, LB_RESETCONTENT
, 0, 0);
375 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
376 SendDlgItemMessage (hwnd
, 100, LB_ADDSTRING
,
377 0, (LPARAM
) key
->comment
);
379 SendDlgItemMessage (hwnd
, 100, LB_SETCURSEL
, (WPARAM
) -1, 0);
382 case 102: /* remove key */
383 if (HIWORD(wParam
) == BN_CLICKED
||
384 HIWORD(wParam
) == BN_DOUBLECLICKED
) {
385 int n
= SendDlgItemMessage (hwnd
, 100, LB_GETCURSEL
, 0, 0);
386 if (n
== LB_ERR
|| n
== 0) {
390 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
))
393 del234(rsakeys
, key
);
394 freersakey(key
); free(key
);
395 SendDlgItemMessage(hwnd
, 100, LB_RESETCONTENT
, 0, 0);
396 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
397 SendDlgItemMessage (hwnd
, 100, LB_ADDSTRING
,
398 0, (LPARAM
) key
->comment
);
400 SendDlgItemMessage (hwnd
, 100, LB_SETCURSEL
, (WPARAM
) -1, 0);
413 static LRESULT CALLBACK
WndProc (HWND hwnd
, UINT message
,
414 WPARAM wParam
, LPARAM lParam
) {
416 static int menuinprogress
;
420 if (lParam
== WM_RBUTTONUP
) {
422 GetCursorPos(&cursorpos
);
423 PostMessage(hwnd
, WM_SYSTRAY2
, cursorpos
.x
, cursorpos
.y
);
424 } else if (lParam
== WM_LBUTTONDBLCLK
) {
425 /* Equivalent to IDM_VIEWKEYS. */
426 PostMessage(hwnd
, WM_COMMAND
, IDM_VIEWKEYS
, 0);
430 if (!menuinprogress
) {
432 SetForegroundWindow(hwnd
);
433 ret
= TrackPopupMenu(systray_menu
,
434 TPM_RIGHTALIGN
| TPM_BOTTOMALIGN
|
436 wParam
, lParam
, 0, hwnd
, NULL
);
442 switch (wParam
& ~0xF) { /* low 4 bits reserved to Windows */
444 SendMessage(hwnd
, WM_CLOSE
, 0, 0);
448 keylist
= CreateDialog (instance
, MAKEINTRESOURCE(211),
450 ShowWindow (keylist
, SW_SHOWNORMAL
);
452 * Sometimes the window comes up minimised / hidden
453 * for no obvious reason. Prevent this.
455 SetForegroundWindow(keylist
);
456 SetWindowPos (keylist
, HWND_TOP
, 0, 0, 0, 0,
457 SWP_NOMOVE
| SWP_NOSIZE
| SWP_SHOWWINDOW
);
470 HANDLE filemap
, proc
;
471 PSID mapowner
, procowner
;
472 PSECURITY_DESCRIPTOR psd1
= NULL
, psd2
= NULL
;
475 cds
= (COPYDATASTRUCT
*)lParam
;
476 if (cds
->dwData
!= AGENT_COPYDATA_ID
)
477 return 0; /* not our message, mate */
478 mapname
= (char *)cds
->lpData
;
479 if (mapname
[cds
->cbData
- 1] != '\0')
480 return 0; /* failure to be ASCIZ! */
482 debug(("mapname is :%s:\r\n", mapname
));
484 filemap
= OpenFileMapping(FILE_MAP_ALL_ACCESS
, FALSE
, mapname
);
486 debug(("filemap is %p\r\n", filemap
));
488 if (filemap
!= NULL
&& filemap
!= INVALID_HANDLE_VALUE
) {
490 if ((proc
= OpenProcess(MAXIMUM_ALLOWED
, FALSE
,
491 GetCurrentProcessId())) == NULL
) {
493 debug(("couldn't get handle for process\r\n"));
497 if (GetSecurityInfo(proc
, SE_KERNEL_OBJECT
,
498 OWNER_SECURITY_INFORMATION
,
499 &procowner
, NULL
, NULL
, NULL
,
500 &psd2
) != ERROR_SUCCESS
) {
502 debug(("couldn't get owner info for process\r\n"));
505 return 0; /* unable to get security info */
508 if ((rc
= GetSecurityInfo(filemap
, SE_KERNEL_OBJECT
,
509 OWNER_SECURITY_INFORMATION
,
510 &mapowner
, NULL
, NULL
, NULL
,
511 &psd1
) != ERROR_SUCCESS
)) {
513 debug(("couldn't get owner info for filemap: %d\r\n", rc
));
518 debug(("got security stuff\r\n"));
520 if (!EqualSid(mapowner
, procowner
))
521 return 0; /* security ID mismatch! */
523 debug(("security stuff matched\r\n"));
527 p
= MapViewOfFile(filemap
, FILE_MAP_WRITE
, 0, 0, 0);
529 debug(("p is %p\r\n", p
));
530 {int i
; for(i
=0;i
<5;i
++)debug(("p[%d]=%02x\r\n", i
, ((unsigned char *)p
)[i
]));}
536 CloseHandle(filemap
);
541 return DefWindowProc (hwnd
, message
, wParam
, lParam
);
544 int WINAPI
WinMain(HINSTANCE inst
, HINSTANCE prev
, LPSTR cmdline
, int show
) {
549 * First bomb out totally if we are already running.
551 if (FindWindow("Pageant", "Pageant")) {
552 MessageBox(NULL
, "Pageant is already running", "Pageant Error",
553 MB_ICONERROR
| MB_OK
);
561 wndclass
.lpfnWndProc
= WndProc
;
562 wndclass
.cbClsExtra
= 0;
563 wndclass
.cbWndExtra
= 0;
564 wndclass
.hInstance
= inst
;
565 wndclass
.hIcon
= LoadIcon (inst
,
566 MAKEINTRESOURCE(IDI_MAINICON
));
567 wndclass
.hCursor
= LoadCursor (NULL
, IDC_IBEAM
);
568 wndclass
.hbrBackground
= GetStockObject (BLACK_BRUSH
);
569 wndclass
.lpszMenuName
= NULL
;
570 wndclass
.lpszClassName
= APPNAME
;
572 RegisterClass (&wndclass
);
575 hwnd
= keylist
= NULL
;
577 hwnd
= CreateWindow (APPNAME
, APPNAME
,
578 WS_OVERLAPPEDWINDOW
| WS_VSCROLL
,
579 CW_USEDEFAULT
, CW_USEDEFAULT
,
580 100, 100, NULL
, NULL
, inst
, NULL
);
582 /* Set up a system tray icon */
588 #ifdef NIM_SETVERSION
590 res
= Shell_NotifyIcon(NIM_SETVERSION
, &tnid
);
593 tnid
.cbSize
= sizeof(NOTIFYICONDATA
);
595 tnid
.uID
= 1; /* unique within this systray use */
596 tnid
.uFlags
= NIF_MESSAGE
| NIF_ICON
| NIF_TIP
;
597 tnid
.uCallbackMessage
= WM_SYSTRAY
;
598 tnid
.hIcon
= hicon
= LoadIcon (instance
, MAKEINTRESOURCE(201));
599 strcpy(tnid
.szTip
, "Pageant (PuTTY authentication agent)");
601 res
= Shell_NotifyIcon(NIM_ADD
, &tnid
);
606 systray_menu
= CreatePopupMenu();
607 AppendMenu (systray_menu
, MF_ENABLED
, IDM_VIEWKEYS
, "View Keys");
608 AppendMenu (systray_menu
, MF_ENABLED
, IDM_CLOSE
, "Terminate");
611 ShowWindow (hwnd
, SW_HIDE
);
614 * Initialise storage for RSA keys.
616 rsakeys
= newtree234(cmpkeys
);
619 * Process the command line and add RSA keys as listed on it.
626 while (*p
&& isspace(*p
)) p
++;
627 if (*p
&& !isspace(*p
)) {
628 char *q
= p
, *pp
= p
;
629 while (*p
&& (inquotes
|| !isspace(*p
)))
632 inquotes
= !inquotes
;
650 while (GetMessage(&msg
, NULL
, 0, 0) == 1) {
651 TranslateMessage(&msg
);
652 DispatchMessage(&msg
);
655 /* Clean up the system tray icon */
659 tnid
.cbSize
= sizeof(NOTIFYICONDATA
);
663 Shell_NotifyIcon(NIM_DELETE
, &tnid
);
665 DestroyMenu(systray_menu
);