2 * Pageant: the PuTTY Authentication Agent.
15 #define IDI_MAINICON 200
16 #define IDI_TRAYICON 201
18 #define WM_XUSER (WM_USER + 0x2000)
19 #define WM_SYSTRAY (WM_XUSER + 6)
20 #define WM_SYSTRAY2 (WM_XUSER + 7)
22 #define AGENT_COPYDATA_ID 0x804e50ba /* random goop */
25 * FIXME: maybe some day we can sort this out ...
27 #define AGENT_MAX_MSGLEN 8192
29 #define IDM_CLOSE 0x0010
30 #define IDM_VIEWKEYS 0x0020
31 #define IDM_ADDKEY 0x0030
32 #define IDM_ABOUT 0x0040
34 #define APPNAME "Pageant"
36 #define SSH_AGENTC_REQUEST_RSA_IDENTITIES 1
37 #define SSH_AGENT_RSA_IDENTITIES_ANSWER 2
38 #define SSH_AGENTC_RSA_CHALLENGE 3
39 #define SSH_AGENT_RSA_RESPONSE 4
40 #define SSH_AGENT_FAILURE 5
41 #define SSH_AGENT_SUCCESS 6
42 #define SSH_AGENTC_ADD_RSA_IDENTITY 7
43 #define SSH_AGENTC_REMOVE_RSA_IDENTITY 8
47 static HINSTANCE instance
;
51 static HMENU systray_menu
;
53 static tree234
*rsakeys
;
55 static int has_security
;
57 typedef DWORD (WINAPI
*gsi_fn_t
)
58 (HANDLE
, SE_OBJECT_TYPE
, SECURITY_INFORMATION
,
59 PSID
*, PSID
*, PACL
*, PACL
*,
60 PSECURITY_DESCRIPTOR
*);
61 static gsi_fn_t getsecurityinfo
;
65 * We need this to link with the RSA code, because rsaencrypt()
66 * pads its data with random bytes. Since we only use rsadecrypt(),
67 * which is deterministic, this should never be called.
69 * If it _is_ called, there is a _serious_ problem, because it
70 * won't generate true random numbers. So we must scream, panic,
71 * and exit immediately if that should happen.
73 int random_byte(void) {
74 MessageBox(hwnd
, "Internal Error", APPNAME
, MB_OK
| MB_ICONERROR
);
79 * This function is needed to link with the DES code. We need not
80 * have it do anything at all.
82 void logevent(char *msg
) {
85 #define GET_32BIT(cp) \
86 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
87 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
88 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
89 ((unsigned long)(unsigned char)(cp)[3]))
91 #define PUT_32BIT(cp, value) { \
92 (cp)[0] = (unsigned char)((value) >> 24); \
93 (cp)[1] = (unsigned char)((value) >> 16); \
94 (cp)[2] = (unsigned char)((value) >> 8); \
95 (cp)[3] = (unsigned char)(value); }
97 #define PASSPHRASE_MAXLEN 512
99 struct PassphraseProcStruct
{
105 * Dialog-box function for the Licence box.
107 static int CALLBACK
LicenceProc (HWND hwnd
, UINT msg
,
108 WPARAM wParam
, LPARAM lParam
) {
113 switch (LOWORD(wParam
)) {
127 * Dialog-box function for the About box.
129 static int CALLBACK
AboutProc (HWND hwnd
, UINT msg
,
130 WPARAM wParam
, LPARAM lParam
) {
133 SetDlgItemText (hwnd
, 100, ver
);
136 switch (LOWORD(wParam
)) {
139 DestroyWindow (hwnd
);
142 EnableWindow(hwnd
, 0);
143 DialogBox (instance
, MAKEINTRESOURCE(214), NULL
, LicenceProc
);
144 EnableWindow(hwnd
, 1);
145 SetActiveWindow(hwnd
);
151 DestroyWindow (hwnd
);
158 * Dialog-box function for the passphrase box.
160 static int CALLBACK
PassphraseProc(HWND hwnd
, UINT msg
,
161 WPARAM wParam
, LPARAM lParam
) {
162 static char *passphrase
;
163 struct PassphraseProcStruct
*p
;
167 SetForegroundWindow(hwnd
);
168 SetWindowPos (hwnd
, HWND_TOP
, 0, 0, 0, 0,
169 SWP_NOMOVE
| SWP_NOSIZE
| SWP_SHOWWINDOW
);
170 p
= (struct PassphraseProcStruct
*)lParam
;
171 passphrase
= p
->passphrase
;
173 SetDlgItemText(hwnd
, 101, p
->comment
);
177 switch (LOWORD(wParam
)) {
187 case 102: /* edit box */
188 if (HIWORD(wParam
) == EN_CHANGE
) {
189 GetDlgItemText (hwnd
, 102, passphrase
, PASSPHRASE_MAXLEN
-1);
190 passphrase
[PASSPHRASE_MAXLEN
-1] = '\0';
203 * Update the visible key list.
205 static void keylist_update(void) {
210 SendDlgItemMessage(keylist
, 100, LB_RESETCONTENT
, 0, 0);
211 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
212 char listentry
[512], *p
;
214 * Replace two spaces in the fingerprint with tabs, for
215 * nice alignment in the box.
217 rsa_fingerprint(listentry
, sizeof(listentry
), key
);
218 p
= strchr(listentry
, ' '); if (p
) *p
= '\t';
219 p
= strchr(listentry
, ' '); if (p
) *p
= '\t';
220 SendDlgItemMessage (keylist
, 100, LB_ADDSTRING
,
221 0, (LPARAM
)listentry
);
223 SendDlgItemMessage (keylist
, 100, LB_SETCURSEL
, (WPARAM
) -1, 0);
228 * This function loads a key from a file and adds it.
230 static void add_keyfile(char *filename
) {
231 char passphrase
[PASSPHRASE_MAXLEN
];
237 struct PassphraseProcStruct pps
;
239 needs_pass
= rsakey_encrypted(filename
, &comment
);
241 key
= malloc(sizeof(*key
));
242 pps
.passphrase
= passphrase
;
243 pps
.comment
= comment
;
247 dlgret
= DialogBoxParam(instance
, MAKEINTRESOURCE(210),
248 NULL
, PassphraseProc
,
251 if (comment
) free(comment
);
253 return; /* operation cancelled */
257 ret
= loadrsakey(filename
, key
, NULL
, passphrase
);
260 if (comment
) free(comment
);
262 MessageBox(NULL
, "Couldn't load private key.", APPNAME
,
263 MB_OK
| MB_ICONERROR
);
267 if (add234(rsakeys
, key
) != key
)
268 free(key
); /* already present, don't waste RAM */
272 * This is the main agent function that answers messages.
274 static void answer_msg(void *msg
) {
275 unsigned char *p
= msg
;
276 unsigned char *ret
= msg
;
280 * Get the message type.
286 case SSH_AGENTC_REQUEST_RSA_IDENTITIES
:
288 * Reply with SSH_AGENT_RSA_IDENTITIES_ANSWER.
296 * Count up the number and length of keys we hold.
299 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
301 len
+= 4; /* length field */
302 len
+= ssh1_bignum_length(key
->exponent
);
303 len
+= ssh1_bignum_length(key
->modulus
);
304 len
+= 4 + strlen(key
->comment
);
308 * Packet header is the obvious five bytes, plus four
309 * bytes for the key count.
312 if (len
> AGENT_MAX_MSGLEN
)
313 goto failure
; /* aaargh! too much stuff! */
314 PUT_32BIT(ret
, len
-4);
315 ret
[4] = SSH_AGENT_RSA_IDENTITIES_ANSWER
;
316 PUT_32BIT(ret
+5, nkeys
);
318 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
319 PUT_32BIT(p
, ssh1_bignum_bitcount(key
->modulus
));
321 p
+= ssh1_write_bignum(p
, key
->exponent
);
322 p
+= ssh1_write_bignum(p
, key
->modulus
);
323 PUT_32BIT(p
, strlen(key
->comment
));
324 memcpy(p
+4, key
->comment
, strlen(key
->comment
));
325 p
+= 4 + strlen(key
->comment
);
329 case SSH_AGENTC_RSA_CHALLENGE
:
331 * Reply with either SSH_AGENT_RSA_RESPONSE or
332 * SSH_AGENT_FAILURE, depending on whether we have that key
336 struct RSAKey reqkey
, *key
;
337 Bignum challenge
, response
;
338 unsigned char response_source
[48], response_md5
[16];
339 struct MD5Context md5c
;
343 p
+= ssh1_read_bignum(p
, &reqkey
.exponent
);
344 p
+= ssh1_read_bignum(p
, &reqkey
.modulus
);
345 p
+= ssh1_read_bignum(p
, &challenge
);
346 memcpy(response_source
+32, p
, 16); p
+= 16;
347 if (GET_32BIT(p
) != 1 ||
348 (key
= find234(rsakeys
, &reqkey
, NULL
)) == NULL
) {
349 freebn(reqkey
.exponent
);
350 freebn(reqkey
.modulus
);
354 response
= rsadecrypt(challenge
, key
);
355 for (i
= 0; i
< 32; i
++)
356 response_source
[i
] = bignum_byte(response
, 31-i
);
359 MD5Update(&md5c
, response_source
, 48);
360 MD5Final(response_md5
, &md5c
);
361 memset(response_source
, 0, 48); /* burn the evidence */
362 freebn(response
); /* and that evidence */
363 freebn(challenge
); /* yes, and that evidence */
364 freebn(reqkey
.exponent
); /* and free some memory ... */
365 freebn(reqkey
.modulus
); /* ... while we're at it. */
368 * Packet is the obvious five byte header, plus sixteen
372 PUT_32BIT(ret
, len
-4);
373 ret
[4] = SSH_AGENT_RSA_RESPONSE
;
374 memcpy(ret
+5, response_md5
, 16);
377 case SSH_AGENTC_ADD_RSA_IDENTITY
:
379 * Add to the list and return SSH_AGENT_SUCCESS, or
380 * SSH_AGENT_FAILURE if the key was malformed.
385 key
= malloc(sizeof(struct RSAKey
));
386 memset(key
, 0, sizeof(key
));
387 p
+= makekey(p
, key
, NULL
, 1);
388 p
+= makeprivate(p
, key
);
389 p
+= ssh1_read_bignum(p
, NULL
); /* p^-1 mod q */
390 p
+= ssh1_read_bignum(p
, NULL
); /* p */
391 p
+= ssh1_read_bignum(p
, NULL
); /* q */
392 comment
= malloc(GET_32BIT(p
));
394 memcpy(comment
, p
+4, GET_32BIT(p
));
395 key
->comment
= comment
;
398 ret
[4] = SSH_AGENT_FAILURE
;
399 if (add234(rsakeys
, key
) == key
) {
401 ret
[4] = SSH_AGENT_SUCCESS
;
408 case SSH_AGENTC_REMOVE_RSA_IDENTITY
:
410 * Remove from the list and return SSH_AGENT_SUCCESS, or
411 * perhaps SSH_AGENT_FAILURE if it wasn't in the list to
415 struct RSAKey reqkey
, *key
;
417 p
+= makekey(p
, &reqkey
, NULL
, 0);
418 key
= find234(rsakeys
, &reqkey
, NULL
);
419 freebn(reqkey
.exponent
);
420 freebn(reqkey
.modulus
);
422 ret
[4] = SSH_AGENT_FAILURE
;
424 del234(rsakeys
, key
);
427 ret
[4] = SSH_AGENT_SUCCESS
;
434 * Unrecognised message. Return SSH_AGENT_FAILURE.
437 ret
[4] = SSH_AGENT_FAILURE
;
443 * Key comparison function for the 2-3-4 tree of RSA keys.
445 static int cmpkeys(void *av
, void *bv
) {
446 struct RSAKey
*a
= (struct RSAKey
*)av
;
447 struct RSAKey
*b
= (struct RSAKey
*)bv
;
454 * Compare by length of moduli.
456 alen
= ssh1_bignum_bitcount(am
);
457 blen
= ssh1_bignum_bitcount(bm
);
458 if (alen
> blen
) return +1; else if (alen
< blen
) return -1;
460 * Now compare by moduli themselves.
462 alen
= (alen
+ 7) / 8; /* byte count */
465 abyte
= bignum_byte(am
, alen
);
466 bbyte
= bignum_byte(bm
, alen
);
467 if (abyte
> bbyte
) return +1; else if (abyte
< bbyte
) return -1;
475 static void error(char *s
) {
476 MessageBox(hwnd
, s
, APPNAME
, MB_OK
| MB_ICONERROR
);
480 * Prompt for a key file to add, and add it.
482 static void prompt_add_keyfile(void) {
484 char filename
[FILENAME_MAX
];
485 memset(&of
, 0, sizeof(of
));
486 #ifdef OPENFILENAME_SIZE_VERSION_400
487 of
.lStructSize
= OPENFILENAME_SIZE_VERSION_400
;
489 of
.lStructSize
= sizeof(of
);
492 of
.lpstrFilter
= "All Files\0*\0\0\0";
493 of
.lpstrCustomFilter
= NULL
;
495 of
.lpstrFile
= filename
; *filename
= '\0';
496 of
.nMaxFile
= sizeof(filename
);
497 of
.lpstrFileTitle
= NULL
;
498 of
.lpstrInitialDir
= NULL
;
499 of
.lpstrTitle
= "Select Private Key File";
501 if (GetOpenFileName(&of
)) {
502 add_keyfile(filename
);
508 * Dialog-box function for the key list box.
510 static int CALLBACK
KeyListProc(HWND hwnd
, UINT msg
,
511 WPARAM wParam
, LPARAM lParam
) {
519 static int tabs
[2] = {25, 175};
520 SendDlgItemMessage (hwnd
, 100, LB_SETTABSTOPS
, 2,
526 switch (LOWORD(wParam
)) {
532 case 101: /* add key */
533 if (HIWORD(wParam
) == BN_CLICKED
||
534 HIWORD(wParam
) == BN_DOUBLECLICKED
) {
535 prompt_add_keyfile();
538 case 102: /* remove key */
539 if (HIWORD(wParam
) == BN_CLICKED
||
540 HIWORD(wParam
) == BN_DOUBLECLICKED
) {
541 int n
= SendDlgItemMessage (hwnd
, 100, LB_GETCURSEL
, 0, 0);
546 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
))
549 del234(rsakeys
, key
);
550 freersakey(key
); free(key
);
564 static LRESULT CALLBACK
WndProc (HWND hwnd
, UINT message
,
565 WPARAM wParam
, LPARAM lParam
) {
567 static int menuinprogress
;
571 if (lParam
== WM_RBUTTONUP
) {
573 GetCursorPos(&cursorpos
);
574 PostMessage(hwnd
, WM_SYSTRAY2
, cursorpos
.x
, cursorpos
.y
);
575 } else if (lParam
== WM_LBUTTONDBLCLK
) {
576 /* Equivalent to IDM_VIEWKEYS. */
577 PostMessage(hwnd
, WM_COMMAND
, IDM_VIEWKEYS
, 0);
581 if (!menuinprogress
) {
583 SetForegroundWindow(hwnd
);
584 ret
= TrackPopupMenu(systray_menu
,
585 TPM_RIGHTALIGN
| TPM_BOTTOMALIGN
|
587 wParam
, lParam
, 0, hwnd
, NULL
);
593 switch (wParam
& ~0xF) { /* low 4 bits reserved to Windows */
595 SendMessage(hwnd
, WM_CLOSE
, 0, 0);
599 keylist
= CreateDialog (instance
, MAKEINTRESOURCE(211),
601 ShowWindow (keylist
, SW_SHOWNORMAL
);
603 * Sometimes the window comes up minimised / hidden
604 * for no obvious reason. Prevent this.
606 SetForegroundWindow(keylist
);
607 SetWindowPos (keylist
, HWND_TOP
, 0, 0, 0, 0,
608 SWP_NOMOVE
| SWP_NOSIZE
| SWP_SHOWWINDOW
);
612 prompt_add_keyfile();
616 aboutbox
= CreateDialog (instance
, MAKEINTRESOURCE(213),
618 ShowWindow (aboutbox
, SW_SHOWNORMAL
);
620 * Sometimes the window comes up minimised / hidden
621 * for no obvious reason. Prevent this.
623 SetForegroundWindow(aboutbox
);
624 SetWindowPos (aboutbox
, HWND_TOP
, 0, 0, 0, 0,
625 SWP_NOMOVE
| SWP_NOSIZE
| SWP_SHOWWINDOW
);
638 HANDLE filemap
, proc
;
639 PSID mapowner
, procowner
;
640 PSECURITY_DESCRIPTOR psd1
= NULL
, psd2
= NULL
;
643 cds
= (COPYDATASTRUCT
*)lParam
;
644 if (cds
->dwData
!= AGENT_COPYDATA_ID
)
645 return 0; /* not our message, mate */
646 mapname
= (char *)cds
->lpData
;
647 if (mapname
[cds
->cbData
- 1] != '\0')
648 return 0; /* failure to be ASCIZ! */
650 debug(("mapname is :%s:\r\n", mapname
));
652 filemap
= OpenFileMapping(FILE_MAP_ALL_ACCESS
, FALSE
, mapname
);
654 debug(("filemap is %p\r\n", filemap
));
656 if (filemap
!= NULL
&& filemap
!= INVALID_HANDLE_VALUE
) {
660 if ((proc
= OpenProcess(MAXIMUM_ALLOWED
, FALSE
,
661 GetCurrentProcessId())) == NULL
) {
663 debug(("couldn't get handle for process\r\n"));
667 if (getsecurityinfo(proc
, SE_KERNEL_OBJECT
,
668 OWNER_SECURITY_INFORMATION
,
669 &procowner
, NULL
, NULL
, NULL
,
670 &psd2
) != ERROR_SUCCESS
) {
672 debug(("couldn't get owner info for process\r\n"));
675 return 0; /* unable to get security info */
678 if ((rc
= getsecurityinfo(filemap
, SE_KERNEL_OBJECT
,
679 OWNER_SECURITY_INFORMATION
,
680 &mapowner
, NULL
, NULL
, NULL
,
681 &psd1
) != ERROR_SUCCESS
)) {
683 debug(("couldn't get owner info for filemap: %d\r\n", rc
));
688 debug(("got security stuff\r\n"));
690 if (!EqualSid(mapowner
, procowner
))
691 return 0; /* security ID mismatch! */
693 debug(("security stuff matched\r\n"));
699 debug(("security APIs not present\r\n"));
703 p
= MapViewOfFile(filemap
, FILE_MAP_WRITE
, 0, 0, 0);
705 debug(("p is %p\r\n", p
));
706 {int i
; for(i
=0;i
<5;i
++)debug(("p[%d]=%02x\r\n", i
, ((unsigned char *)p
)[i
]));}
712 CloseHandle(filemap
);
717 return DefWindowProc (hwnd
, message
, wParam
, lParam
);
720 int WINAPI
WinMain(HINSTANCE inst
, HINSTANCE prev
, LPSTR cmdline
, int show
) {
727 * Determine whether we're an NT system (should have security
728 * APIs) or a non-NT system (don't do security).
730 memset(&osi
, 0, sizeof(OSVERSIONINFO
));
731 osi
.dwOSVersionInfoSize
= sizeof(OSVERSIONINFO
);
732 if (GetVersionEx(&osi
) && osi
.dwPlatformId
==VER_PLATFORM_WIN32_NT
) {
735 has_security
= FALSE
;
740 * Attempt to ge the security API we need.
742 advapi
= LoadLibrary("ADVAPI32.DLL");
743 getsecurityinfo
= (gsi_fn_t
)GetProcAddress(advapi
, "GetSecurityInfo");
744 if (!getsecurityinfo
) {
746 "Unable to access security APIs. Pageant will\n"
747 "not run, in case it causes a security breach.",
748 "Pageant Fatal Error", MB_ICONERROR
| MB_OK
);
753 "This program has been compiled for Win9X and will\n"
754 "not run on NT, in case it causes a security breach.",
755 "Pageant Fatal Error", MB_ICONERROR
| MB_OK
);
762 * First bomb out totally if we are already running.
764 if (FindWindow("Pageant", "Pageant")) {
765 MessageBox(NULL
, "Pageant is already running", "Pageant Error",
766 MB_ICONERROR
| MB_OK
);
767 if (advapi
) FreeLibrary(advapi
);
775 wndclass
.lpfnWndProc
= WndProc
;
776 wndclass
.cbClsExtra
= 0;
777 wndclass
.cbWndExtra
= 0;
778 wndclass
.hInstance
= inst
;
779 wndclass
.hIcon
= LoadIcon (inst
,
780 MAKEINTRESOURCE(IDI_MAINICON
));
781 wndclass
.hCursor
= LoadCursor (NULL
, IDC_IBEAM
);
782 wndclass
.hbrBackground
= GetStockObject (BLACK_BRUSH
);
783 wndclass
.lpszMenuName
= NULL
;
784 wndclass
.lpszClassName
= APPNAME
;
786 RegisterClass (&wndclass
);
789 hwnd
= keylist
= NULL
;
791 hwnd
= CreateWindow (APPNAME
, APPNAME
,
792 WS_OVERLAPPEDWINDOW
| WS_VSCROLL
,
793 CW_USEDEFAULT
, CW_USEDEFAULT
,
794 100, 100, NULL
, NULL
, inst
, NULL
);
796 /* Set up a system tray icon */
802 #ifdef NIM_SETVERSION
804 res
= Shell_NotifyIcon(NIM_SETVERSION
, &tnid
);
807 tnid
.cbSize
= sizeof(NOTIFYICONDATA
);
809 tnid
.uID
= 1; /* unique within this systray use */
810 tnid
.uFlags
= NIF_MESSAGE
| NIF_ICON
| NIF_TIP
;
811 tnid
.uCallbackMessage
= WM_SYSTRAY
;
812 tnid
.hIcon
= hicon
= LoadIcon (instance
, MAKEINTRESOURCE(201));
813 strcpy(tnid
.szTip
, "Pageant (PuTTY authentication agent)");
815 res
= Shell_NotifyIcon(NIM_ADD
, &tnid
);
820 systray_menu
= CreatePopupMenu();
821 /* accelerators used: vkxa */
822 AppendMenu (systray_menu
, MF_ENABLED
, IDM_VIEWKEYS
, "&View Keys");
823 AppendMenu (systray_menu
, MF_ENABLED
, IDM_ADDKEY
, "Add &Key");
824 AppendMenu (systray_menu
, MF_ENABLED
, IDM_ABOUT
, "&About");
825 AppendMenu (systray_menu
, MF_ENABLED
, IDM_CLOSE
, "E&xit");
828 ShowWindow (hwnd
, SW_HIDE
);
831 * Initialise storage for RSA keys.
833 rsakeys
= newtree234(cmpkeys
);
836 * Process the command line and add RSA keys as listed on it.
843 while (*p
&& isspace(*p
)) p
++;
844 if (*p
&& !isspace(*p
)) {
845 char *q
= p
, *pp
= p
;
846 while (*p
&& (inquotes
|| !isspace(*p
)))
849 inquotes
= !inquotes
;
867 while (GetMessage(&msg
, NULL
, 0, 0) == 1) {
868 TranslateMessage(&msg
);
869 DispatchMessage(&msg
);
872 /* Clean up the system tray icon */
876 tnid
.cbSize
= sizeof(NOTIFYICONDATA
);
880 Shell_NotifyIcon(NIM_DELETE
, &tnid
);
882 DestroyMenu(systray_menu
);
885 if (advapi
) FreeLibrary(advapi
);