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 needs_pass
= rsakey_encrypted(filename
);
132 key
= malloc(sizeof(*key
));
136 dlgret
= DialogBoxParam(instance
, MAKEINTRESOURCE(210),
137 NULL
, PassphraseProc
,
141 return; /* operation cancelled */
145 ret
= loadrsakey(filename
, key
, passphrase
);
149 MessageBox(NULL
, "Couldn't load public key.", APPNAME
,
150 MB_OK
| MB_ICONERROR
);
154 if (add234(rsakeys
, key
) != key
)
155 free(key
); /* already present, don't waste RAM */
159 * This is the main agent function that answers messages.
161 void answer_msg(void *msg
) {
162 unsigned char *p
= msg
;
163 unsigned char *ret
= msg
;
167 * Get the message type.
173 case SSH_AGENTC_REQUEST_RSA_IDENTITIES
:
175 * Reply with SSH_AGENT_RSA_IDENTITIES_ANSWER.
183 * Count up the number and length of keys we hold.
186 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
188 len
+= 4; /* length field */
189 len
+= ssh1_bignum_length(key
->exponent
);
190 len
+= ssh1_bignum_length(key
->modulus
);
191 len
+= 4 + strlen(key
->comment
);
195 * Packet header is the obvious five bytes, plus four
196 * bytes for the key count.
199 if (len
> AGENT_MAX_MSGLEN
)
200 goto failure
; /* aaargh! too much stuff! */
201 PUT_32BIT(ret
, len
-4);
202 ret
[4] = SSH_AGENT_RSA_IDENTITIES_ANSWER
;
203 PUT_32BIT(ret
+5, nkeys
);
205 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
206 PUT_32BIT(p
, ssh1_bignum_bitcount(key
->modulus
));
208 p
+= ssh1_write_bignum(p
, key
->exponent
);
209 p
+= ssh1_write_bignum(p
, key
->modulus
);
210 PUT_32BIT(p
, strlen(key
->comment
));
211 memcpy(p
+4, key
->comment
, strlen(key
->comment
));
212 p
+= 4 + strlen(key
->comment
);
216 case SSH_AGENTC_RSA_CHALLENGE
:
218 * Reply with either SSH_AGENT_RSA_RESPONSE or
219 * SSH_AGENT_FAILURE, depending on whether we have that key
223 struct RSAKey reqkey
, *key
;
224 Bignum challenge
, response
;
225 unsigned char response_source
[48], response_md5
[16];
226 struct MD5Context md5c
;
230 p
+= ssh1_read_bignum(p
, &reqkey
.exponent
);
231 p
+= ssh1_read_bignum(p
, &reqkey
.modulus
);
232 p
+= ssh1_read_bignum(p
, &challenge
);
233 memcpy(response_source
+32, p
, 16); p
+= 16;
234 if (GET_32BIT(p
) != 1 ||
235 (key
= find234(rsakeys
, &reqkey
, NULL
)) == NULL
) {
236 freebn(reqkey
.exponent
);
237 freebn(reqkey
.modulus
);
241 response
= rsadecrypt(challenge
, key
);
242 for (i
= 0; i
< 32; i
++)
243 response_source
[i
] = bignum_byte(response
, 31-i
);
246 MD5Update(&md5c
, response_source
, 48);
247 MD5Final(response_md5
, &md5c
);
248 memset(response_source
, 0, 48); /* burn the evidence */
249 freebn(response
); /* and that evidence */
250 freebn(challenge
); /* yes, and that evidence */
251 freebn(reqkey
.exponent
); /* and free some memory ... */
252 freebn(reqkey
.modulus
); /* ... while we're at it. */
255 * Packet is the obvious five byte header, plus sixteen
259 PUT_32BIT(ret
, len
-4);
260 ret
[4] = SSH_AGENT_RSA_RESPONSE
;
261 memcpy(ret
+5, response_md5
, 16);
264 #if 0 /* FIXME: implement these */
265 case SSH_AGENTC_ADD_RSA_IDENTITY
:
267 * Add to the list and return SSH_AGENT_SUCCESS, or
268 * SSH_AGENT_FAILURE if the key was malformed.
271 case SSH_AGENTC_REMOVE_RSA_IDENTITY
:
273 * Remove from the list and return SSH_AGENT_SUCCESS, or
274 * perhaps SSH_AGENT_FAILURE if it wasn't in the list to
282 * Unrecognised message. Return SSH_AGENT_FAILURE.
285 ret
[4] = SSH_AGENT_FAILURE
;
291 * Key comparison function for the 2-3-4 tree of RSA keys.
293 int cmpkeys(void *av
, void *bv
) {
294 struct RSAKey
*a
= (struct RSAKey
*)av
;
295 struct RSAKey
*b
= (struct RSAKey
*)bv
;
302 * Compare by length of moduli.
304 alen
= ssh1_bignum_bitcount(am
);
305 blen
= ssh1_bignum_bitcount(bm
);
306 if (alen
> blen
) return +1; else if (alen
< blen
) return -1;
308 * Now compare by moduli themselves.
310 alen
= (alen
+ 7) / 8; /* byte count */
313 abyte
= bignum_byte(am
, alen
);
314 bbyte
= bignum_byte(bm
, alen
);
315 if (abyte
> bbyte
) return +1; else if (abyte
< bbyte
) return -1;
323 static void error(char *s
) {
324 MessageBox(hwnd
, s
, APPNAME
, MB_OK
| MB_ICONERROR
);
328 * Dialog-box function for the key list box.
330 static int CALLBACK
KeyListProc(HWND hwnd
, UINT msg
,
331 WPARAM wParam
, LPARAM lParam
) {
335 char filename
[FILENAME_MAX
];
339 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
340 SendDlgItemMessage (hwnd
, 100, LB_ADDSTRING
,
341 0, (LPARAM
) key
->comment
);
345 switch (LOWORD(wParam
)) {
351 case 101: /* add key */
352 if (HIWORD(wParam
) == BN_CLICKED
||
353 HIWORD(wParam
) == BN_DOUBLECLICKED
) {
354 memset(&of
, 0, sizeof(of
));
355 #ifdef OPENFILENAME_SIZE_VERSION_400
356 of
.lStructSize
= OPENFILENAME_SIZE_VERSION_400
;
358 of
.lStructSize
= sizeof(of
);
361 of
.lpstrFilter
= "All Files\0*\0\0\0";
362 of
.lpstrCustomFilter
= NULL
;
364 of
.lpstrFile
= filename
; *filename
= '\0';
365 of
.nMaxFile
= sizeof(filename
);
366 of
.lpstrFileTitle
= NULL
;
367 of
.lpstrInitialDir
= NULL
;
368 of
.lpstrTitle
= "Select Public Key File";
370 if (GetOpenFileName(&of
)) {
371 add_keyfile(filename
);
373 SendDlgItemMessage(hwnd
, 100, LB_RESETCONTENT
, 0, 0);
374 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
375 SendDlgItemMessage (hwnd
, 100, LB_ADDSTRING
,
376 0, (LPARAM
) key
->comment
);
378 SendDlgItemMessage (hwnd
, 100, LB_SETCURSEL
, (WPARAM
) -1, 0);
381 case 102: /* remove key */
382 if (HIWORD(wParam
) == BN_CLICKED
||
383 HIWORD(wParam
) == BN_DOUBLECLICKED
) {
384 int n
= SendDlgItemMessage (hwnd
, 100, LB_GETCURSEL
, 0, 0);
385 if (n
== LB_ERR
|| n
== 0) {
389 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
))
392 del234(rsakeys
, key
);
393 freersakey(key
); free(key
);
394 SendDlgItemMessage(hwnd
, 100, LB_RESETCONTENT
, 0, 0);
395 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
396 SendDlgItemMessage (hwnd
, 100, LB_ADDSTRING
,
397 0, (LPARAM
) key
->comment
);
399 SendDlgItemMessage (hwnd
, 100, LB_SETCURSEL
, (WPARAM
) -1, 0);
412 static LRESULT CALLBACK
WndProc (HWND hwnd
, UINT message
,
413 WPARAM wParam
, LPARAM lParam
) {
415 static int menuinprogress
;
419 if (lParam
== WM_RBUTTONUP
) {
421 GetCursorPos(&cursorpos
);
422 PostMessage(hwnd
, WM_SYSTRAY2
, cursorpos
.x
, cursorpos
.y
);
426 if (!menuinprogress
) {
428 SetForegroundWindow(hwnd
);
429 ret
= TrackPopupMenu(systray_menu
,
430 TPM_RIGHTALIGN
| TPM_BOTTOMALIGN
|
432 wParam
, lParam
, 0, hwnd
, NULL
);
438 switch (wParam
& ~0xF) { /* low 4 bits reserved to Windows */
440 SendMessage(hwnd
, WM_CLOSE
, 0, 0);
444 keylist
= CreateDialog (instance
, MAKEINTRESOURCE(211),
446 ShowWindow (keylist
, SW_SHOWNORMAL
);
459 HANDLE filemap
, proc
;
460 PSID mapowner
, procowner
;
461 PSECURITY_DESCRIPTOR psd1
= NULL
, psd2
= NULL
;
464 cds
= (COPYDATASTRUCT
*)lParam
;
465 if (cds
->dwData
!= AGENT_COPYDATA_ID
)
466 return 0; /* not our message, mate */
467 mapname
= (char *)cds
->lpData
;
468 if (mapname
[cds
->cbData
- 1] != '\0')
469 return 0; /* failure to be ASCIZ! */
471 debug(("mapname is :%s:\r\n", mapname
));
473 filemap
= OpenFileMapping(FILE_MAP_ALL_ACCESS
, FALSE
, mapname
);
475 debug(("filemap is %p\r\n", filemap
));
477 if (filemap
!= NULL
&& filemap
!= INVALID_HANDLE_VALUE
) {
479 if ((proc
= OpenProcess(MAXIMUM_ALLOWED
, FALSE
,
480 GetCurrentProcessId())) == NULL
) {
482 debug(("couldn't get handle for process\r\n"));
486 if (GetSecurityInfo(proc
, SE_KERNEL_OBJECT
,
487 OWNER_SECURITY_INFORMATION
,
488 &procowner
, NULL
, NULL
, NULL
,
489 &psd2
) != ERROR_SUCCESS
) {
491 debug(("couldn't get owner info for process\r\n"));
494 return 0; /* unable to get security info */
497 if ((rc
= GetSecurityInfo(filemap
, SE_KERNEL_OBJECT
,
498 OWNER_SECURITY_INFORMATION
,
499 &mapowner
, NULL
, NULL
, NULL
,
500 &psd1
) != ERROR_SUCCESS
)) {
502 debug(("couldn't get owner info for filemap: %d\r\n", rc
));
507 debug(("got security stuff\r\n"));
509 if (!EqualSid(mapowner
, procowner
))
510 return 0; /* security ID mismatch! */
512 debug(("security stuff matched\r\n"));
516 p
= MapViewOfFile(filemap
, FILE_MAP_WRITE
, 0, 0, 0);
518 debug(("p is %p\r\n", p
));
519 {int i
; for(i
=0;i
<5;i
++)debug(("p[%d]=%02x\r\n", i
, ((unsigned char *)p
)[i
]));}
525 CloseHandle(filemap
);
530 return DefWindowProc (hwnd
, message
, wParam
, lParam
);
533 int WINAPI
WinMain(HINSTANCE inst
, HINSTANCE prev
, LPSTR cmdline
, int show
) {
541 wndclass
.lpfnWndProc
= WndProc
;
542 wndclass
.cbClsExtra
= 0;
543 wndclass
.cbWndExtra
= 0;
544 wndclass
.hInstance
= inst
;
545 wndclass
.hIcon
= LoadIcon (inst
,
546 MAKEINTRESOURCE(IDI_MAINICON
));
547 wndclass
.hCursor
= LoadCursor (NULL
, IDC_IBEAM
);
548 wndclass
.hbrBackground
= GetStockObject (BLACK_BRUSH
);
549 wndclass
.lpszMenuName
= NULL
;
550 wndclass
.lpszClassName
= APPNAME
;
552 RegisterClass (&wndclass
);
555 hwnd
= keylist
= NULL
;
557 hwnd
= CreateWindow (APPNAME
, APPNAME
,
558 WS_OVERLAPPEDWINDOW
| WS_VSCROLL
,
559 CW_USEDEFAULT
, CW_USEDEFAULT
,
560 100, 100, NULL
, NULL
, inst
, NULL
);
562 /* Set up a system tray icon */
568 #ifdef NIM_SETVERSION
570 res
= Shell_NotifyIcon(NIM_SETVERSION
, &tnid
);
573 tnid
.cbSize
= sizeof(NOTIFYICONDATA
);
575 tnid
.uID
= 1; /* unique within this systray use */
576 tnid
.uFlags
= NIF_MESSAGE
| NIF_ICON
| NIF_TIP
;
577 tnid
.uCallbackMessage
= WM_SYSTRAY
;
578 tnid
.hIcon
= hicon
= LoadIcon (instance
, MAKEINTRESOURCE(201));
579 strcpy(tnid
.szTip
, "Pageant (PuTTY authentication agent)");
581 res
= Shell_NotifyIcon(NIM_ADD
, &tnid
);
586 systray_menu
= CreatePopupMenu();
587 AppendMenu (systray_menu
, MF_ENABLED
, IDM_VIEWKEYS
, "View Keys");
588 AppendMenu (systray_menu
, MF_ENABLED
, IDM_CLOSE
, "Terminate");
591 ShowWindow (hwnd
, SW_HIDE
);
594 * Initialise storage for RSA keys.
596 rsakeys
= newtree234(cmpkeys
);
599 * Process the command line and add RSA keys as listed on it.
600 * FIXME: we don't support spaces in filenames here. We should.
605 while (*p
&& isspace(*p
)) p
++;
606 if (*p
&& !isspace(*p
)) {
608 while (*p
&& !isspace(*p
)) p
++;
618 while (GetMessage(&msg
, NULL
, 0, 0) == 1) {
619 TranslateMessage(&msg
);
620 DispatchMessage(&msg
);
623 /* Clean up the system tray icon */
627 tnid
.cbSize
= sizeof(NOTIFYICONDATA
);
631 Shell_NotifyIcon(NIM_DELETE
, &tnid
);
633 DestroyMenu(systray_menu
);