2 * Pageant: the PuTTY Authentication Agent.
13 #define IDI_MAINICON 200
14 #define IDI_TRAYICON 201
16 #define WM_XUSER (WM_USER + 0x2000)
17 #define WM_SYSTRAY (WM_XUSER + 6)
18 #define WM_SYSTRAY2 (WM_XUSER + 7)
20 #define AGENT_COPYDATA_ID 0x804e50ba /* random goop */
23 * FIXME: maybe some day we can sort this out ...
25 #define AGENT_MAX_MSGLEN 8192
27 #define IDM_CLOSE 0x0010
28 #define IDM_VIEWKEYS 0x0020
29 #define IDM_ADDKEY 0x0030
30 #define IDM_ABOUT 0x0040
32 #define APPNAME "Pageant"
34 #define SSH_AGENTC_REQUEST_RSA_IDENTITIES 1
35 #define SSH_AGENT_RSA_IDENTITIES_ANSWER 2
36 #define SSH_AGENTC_RSA_CHALLENGE 3
37 #define SSH_AGENT_RSA_RESPONSE 4
38 #define SSH_AGENT_FAILURE 5
39 #define SSH_AGENT_SUCCESS 6
40 #define SSH_AGENTC_ADD_RSA_IDENTITY 7
41 #define SSH_AGENTC_REMOVE_RSA_IDENTITY 8
45 static HINSTANCE instance
;
49 static HMENU systray_menu
;
51 static tree234
*rsakeys
;
53 static int has_security
;
55 typedef DWORD (WINAPI
*gsi_fn_t
)
56 (HANDLE
, SE_OBJECT_TYPE
, SECURITY_INFORMATION
,
57 PSID
*, PSID
*, PACL
*, PACL
*,
58 PSECURITY_DESCRIPTOR
*);
59 static gsi_fn_t getsecurityinfo
;
63 * We need this to link with the RSA code, because rsaencrypt()
64 * pads its data with random bytes. Since we only use rsadecrypt(),
65 * which is deterministic, this should never be called.
67 * If it _is_ called, there is a _serious_ problem, because it
68 * won't generate true random numbers. So we must scream, panic,
69 * and exit immediately if that should happen.
71 int random_byte(void) {
72 MessageBox(hwnd
, "Internal Error", APPNAME
, MB_OK
| MB_ICONERROR
);
77 * This function is needed to link with the DES code. We need not
78 * have it do anything at all.
80 void logevent(char *msg
) {
83 #define GET_32BIT(cp) \
84 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
85 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
86 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
87 ((unsigned long)(unsigned char)(cp)[3]))
89 #define PUT_32BIT(cp, value) { \
90 (cp)[0] = (unsigned char)((value) >> 24); \
91 (cp)[1] = (unsigned char)((value) >> 16); \
92 (cp)[2] = (unsigned char)((value) >> 8); \
93 (cp)[3] = (unsigned char)(value); }
95 #define PASSPHRASE_MAXLEN 512
97 struct PassphraseProcStruct
{
103 * Dialog-box function for the Licence box.
105 static int CALLBACK
LicenceProc (HWND hwnd
, UINT msg
,
106 WPARAM wParam
, LPARAM lParam
) {
111 switch (LOWORD(wParam
)) {
125 * Dialog-box function for the About box.
127 static int CALLBACK
AboutProc (HWND hwnd
, UINT msg
,
128 WPARAM wParam
, LPARAM lParam
) {
131 SetDlgItemText (hwnd
, 100, ver
);
134 switch (LOWORD(wParam
)) {
137 DestroyWindow (hwnd
);
140 EnableWindow(hwnd
, 0);
141 DialogBox (instance
, MAKEINTRESOURCE(214), NULL
, LicenceProc
);
142 EnableWindow(hwnd
, 1);
143 SetActiveWindow(hwnd
);
149 DestroyWindow (hwnd
);
156 * Dialog-box function for the passphrase box.
158 static int CALLBACK
PassphraseProc(HWND hwnd
, UINT msg
,
159 WPARAM wParam
, LPARAM lParam
) {
160 static char *passphrase
;
161 struct PassphraseProcStruct
*p
;
165 SetForegroundWindow(hwnd
);
166 SetWindowPos (hwnd
, HWND_TOP
, 0, 0, 0, 0,
167 SWP_NOMOVE
| SWP_NOSIZE
| SWP_SHOWWINDOW
);
168 p
= (struct PassphraseProcStruct
*)lParam
;
169 passphrase
= p
->passphrase
;
171 SetDlgItemText(hwnd
, 101, p
->comment
);
175 switch (LOWORD(wParam
)) {
185 case 102: /* edit box */
186 if (HIWORD(wParam
) == EN_CHANGE
) {
187 GetDlgItemText (hwnd
, 102, passphrase
, PASSPHRASE_MAXLEN
-1);
188 passphrase
[PASSPHRASE_MAXLEN
-1] = '\0';
201 * Update the visible key list.
203 static void keylist_update(void) {
208 SendDlgItemMessage(keylist
, 100, LB_RESETCONTENT
, 0, 0);
209 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
210 char listentry
[512], *p
;
212 * Replace two spaces in the fingerprint with tabs, for
213 * nice alignment in the box.
215 rsa_fingerprint(listentry
, sizeof(listentry
), key
);
216 p
= strchr(listentry
, ' '); if (p
) *p
= '\t';
217 p
= strchr(listentry
, ' '); if (p
) *p
= '\t';
218 SendDlgItemMessage (keylist
, 100, LB_ADDSTRING
,
219 0, (LPARAM
)listentry
);
221 SendDlgItemMessage (keylist
, 100, LB_SETCURSEL
, (WPARAM
) -1, 0);
226 * This function loads a key from a file and adds it.
228 static void add_keyfile(char *filename
) {
229 char passphrase
[PASSPHRASE_MAXLEN
];
235 struct PassphraseProcStruct pps
;
237 needs_pass
= rsakey_encrypted(filename
, &comment
);
239 key
= malloc(sizeof(*key
));
240 pps
.passphrase
= passphrase
;
241 pps
.comment
= comment
;
245 dlgret
= DialogBoxParam(instance
, MAKEINTRESOURCE(210),
246 NULL
, PassphraseProc
,
249 if (comment
) free(comment
);
251 return; /* operation cancelled */
255 ret
= loadrsakey(filename
, key
, NULL
, passphrase
);
258 if (comment
) free(comment
);
260 MessageBox(NULL
, "Couldn't load private key.", APPNAME
,
261 MB_OK
| MB_ICONERROR
);
265 if (add234(rsakeys
, key
) != key
)
266 free(key
); /* already present, don't waste RAM */
270 * This is the main agent function that answers messages.
272 static void answer_msg(void *msg
) {
273 unsigned char *p
= msg
;
274 unsigned char *ret
= msg
;
278 * Get the message type.
284 case SSH_AGENTC_REQUEST_RSA_IDENTITIES
:
286 * Reply with SSH_AGENT_RSA_IDENTITIES_ANSWER.
294 * Count up the number and length of keys we hold.
297 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
299 len
+= 4; /* length field */
300 len
+= ssh1_bignum_length(key
->exponent
);
301 len
+= ssh1_bignum_length(key
->modulus
);
302 len
+= 4 + strlen(key
->comment
);
306 * Packet header is the obvious five bytes, plus four
307 * bytes for the key count.
310 if (len
> AGENT_MAX_MSGLEN
)
311 goto failure
; /* aaargh! too much stuff! */
312 PUT_32BIT(ret
, len
-4);
313 ret
[4] = SSH_AGENT_RSA_IDENTITIES_ANSWER
;
314 PUT_32BIT(ret
+5, nkeys
);
316 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
)) {
317 PUT_32BIT(p
, ssh1_bignum_bitcount(key
->modulus
));
319 p
+= ssh1_write_bignum(p
, key
->exponent
);
320 p
+= ssh1_write_bignum(p
, key
->modulus
);
321 PUT_32BIT(p
, strlen(key
->comment
));
322 memcpy(p
+4, key
->comment
, strlen(key
->comment
));
323 p
+= 4 + strlen(key
->comment
);
327 case SSH_AGENTC_RSA_CHALLENGE
:
329 * Reply with either SSH_AGENT_RSA_RESPONSE or
330 * SSH_AGENT_FAILURE, depending on whether we have that key
334 struct RSAKey reqkey
, *key
;
335 Bignum challenge
, response
;
336 unsigned char response_source
[48], response_md5
[16];
337 struct MD5Context md5c
;
341 p
+= ssh1_read_bignum(p
, &reqkey
.exponent
);
342 p
+= ssh1_read_bignum(p
, &reqkey
.modulus
);
343 p
+= ssh1_read_bignum(p
, &challenge
);
344 memcpy(response_source
+32, p
, 16); p
+= 16;
345 if (GET_32BIT(p
) != 1 ||
346 (key
= find234(rsakeys
, &reqkey
, NULL
)) == NULL
) {
347 freebn(reqkey
.exponent
);
348 freebn(reqkey
.modulus
);
352 response
= rsadecrypt(challenge
, key
);
353 for (i
= 0; i
< 32; i
++)
354 response_source
[i
] = bignum_byte(response
, 31-i
);
357 MD5Update(&md5c
, response_source
, 48);
358 MD5Final(response_md5
, &md5c
);
359 memset(response_source
, 0, 48); /* burn the evidence */
360 freebn(response
); /* and that evidence */
361 freebn(challenge
); /* yes, and that evidence */
362 freebn(reqkey
.exponent
); /* and free some memory ... */
363 freebn(reqkey
.modulus
); /* ... while we're at it. */
366 * Packet is the obvious five byte header, plus sixteen
370 PUT_32BIT(ret
, len
-4);
371 ret
[4] = SSH_AGENT_RSA_RESPONSE
;
372 memcpy(ret
+5, response_md5
, 16);
375 case SSH_AGENTC_ADD_RSA_IDENTITY
:
377 * Add to the list and return SSH_AGENT_SUCCESS, or
378 * SSH_AGENT_FAILURE if the key was malformed.
383 key
= malloc(sizeof(struct RSAKey
));
384 memset(key
, 0, sizeof(key
));
385 p
+= makekey(p
, key
, NULL
, 1);
386 p
+= makeprivate(p
, key
);
387 p
+= ssh1_read_bignum(p
, NULL
); /* p^-1 mod q */
388 p
+= ssh1_read_bignum(p
, NULL
); /* p */
389 p
+= ssh1_read_bignum(p
, NULL
); /* q */
390 comment
= malloc(GET_32BIT(p
));
392 memcpy(comment
, p
+4, GET_32BIT(p
));
393 key
->comment
= comment
;
396 ret
[4] = SSH_AGENT_FAILURE
;
397 if (add234(rsakeys
, key
) == key
) {
399 ret
[4] = SSH_AGENT_SUCCESS
;
406 case SSH_AGENTC_REMOVE_RSA_IDENTITY
:
408 * Remove from the list and return SSH_AGENT_SUCCESS, or
409 * perhaps SSH_AGENT_FAILURE if it wasn't in the list to
413 struct RSAKey reqkey
, *key
;
415 p
+= makekey(p
, &reqkey
, NULL
, 0);
416 key
= find234(rsakeys
, &reqkey
, NULL
);
417 freebn(reqkey
.exponent
);
418 freebn(reqkey
.modulus
);
420 ret
[4] = SSH_AGENT_FAILURE
;
422 del234(rsakeys
, key
);
425 ret
[4] = SSH_AGENT_SUCCESS
;
432 * Unrecognised message. Return SSH_AGENT_FAILURE.
435 ret
[4] = SSH_AGENT_FAILURE
;
441 * Key comparison function for the 2-3-4 tree of RSA keys.
443 static int cmpkeys(void *av
, void *bv
) {
444 struct RSAKey
*a
= (struct RSAKey
*)av
;
445 struct RSAKey
*b
= (struct RSAKey
*)bv
;
452 * Compare by length of moduli.
454 alen
= ssh1_bignum_bitcount(am
);
455 blen
= ssh1_bignum_bitcount(bm
);
456 if (alen
> blen
) return +1; else if (alen
< blen
) return -1;
458 * Now compare by moduli themselves.
460 alen
= (alen
+ 7) / 8; /* byte count */
463 abyte
= bignum_byte(am
, alen
);
464 bbyte
= bignum_byte(bm
, alen
);
465 if (abyte
> bbyte
) return +1; else if (abyte
< bbyte
) return -1;
473 static void error(char *s
) {
474 MessageBox(hwnd
, s
, APPNAME
, MB_OK
| MB_ICONERROR
);
478 * Prompt for a key file to add, and add it.
480 static void prompt_add_keyfile(void) {
482 char filename
[FILENAME_MAX
];
483 memset(&of
, 0, sizeof(of
));
484 #ifdef OPENFILENAME_SIZE_VERSION_400
485 of
.lStructSize
= OPENFILENAME_SIZE_VERSION_400
;
487 of
.lStructSize
= sizeof(of
);
490 of
.lpstrFilter
= "All Files\0*\0\0\0";
491 of
.lpstrCustomFilter
= NULL
;
493 of
.lpstrFile
= filename
; *filename
= '\0';
494 of
.nMaxFile
= sizeof(filename
);
495 of
.lpstrFileTitle
= NULL
;
496 of
.lpstrInitialDir
= NULL
;
497 of
.lpstrTitle
= "Select Private Key File";
499 if (GetOpenFileName(&of
)) {
500 add_keyfile(filename
);
506 * Dialog-box function for the key list box.
508 static int CALLBACK
KeyListProc(HWND hwnd
, UINT msg
,
509 WPARAM wParam
, LPARAM lParam
) {
517 static int tabs
[2] = {25, 175};
518 SendDlgItemMessage (hwnd
, 100, LB_SETTABSTOPS
, 2,
524 switch (LOWORD(wParam
)) {
530 case 101: /* add key */
531 if (HIWORD(wParam
) == BN_CLICKED
||
532 HIWORD(wParam
) == BN_DOUBLECLICKED
) {
533 prompt_add_keyfile();
536 case 102: /* remove key */
537 if (HIWORD(wParam
) == BN_CLICKED
||
538 HIWORD(wParam
) == BN_DOUBLECLICKED
) {
539 int n
= SendDlgItemMessage (hwnd
, 100, LB_GETCURSEL
, 0, 0);
544 for (key
= first234(rsakeys
, &e
); key
; key
= next234(&e
))
547 del234(rsakeys
, key
);
548 freersakey(key
); free(key
);
562 static LRESULT CALLBACK
WndProc (HWND hwnd
, UINT message
,
563 WPARAM wParam
, LPARAM lParam
) {
565 static int menuinprogress
;
569 if (lParam
== WM_RBUTTONUP
) {
571 GetCursorPos(&cursorpos
);
572 PostMessage(hwnd
, WM_SYSTRAY2
, cursorpos
.x
, cursorpos
.y
);
573 } else if (lParam
== WM_LBUTTONDBLCLK
) {
574 /* Equivalent to IDM_VIEWKEYS. */
575 PostMessage(hwnd
, WM_COMMAND
, IDM_VIEWKEYS
, 0);
579 if (!menuinprogress
) {
581 SetForegroundWindow(hwnd
);
582 ret
= TrackPopupMenu(systray_menu
,
583 TPM_RIGHTALIGN
| TPM_BOTTOMALIGN
|
585 wParam
, lParam
, 0, hwnd
, NULL
);
591 switch (wParam
& ~0xF) { /* low 4 bits reserved to Windows */
593 SendMessage(hwnd
, WM_CLOSE
, 0, 0);
597 keylist
= CreateDialog (instance
, MAKEINTRESOURCE(211),
599 ShowWindow (keylist
, SW_SHOWNORMAL
);
601 * Sometimes the window comes up minimised / hidden
602 * for no obvious reason. Prevent this.
604 SetForegroundWindow(keylist
);
605 SetWindowPos (keylist
, HWND_TOP
, 0, 0, 0, 0,
606 SWP_NOMOVE
| SWP_NOSIZE
| SWP_SHOWWINDOW
);
610 prompt_add_keyfile();
614 aboutbox
= CreateDialog (instance
, MAKEINTRESOURCE(213),
616 ShowWindow (aboutbox
, SW_SHOWNORMAL
);
618 * Sometimes the window comes up minimised / hidden
619 * for no obvious reason. Prevent this.
621 SetForegroundWindow(aboutbox
);
622 SetWindowPos (aboutbox
, HWND_TOP
, 0, 0, 0, 0,
623 SWP_NOMOVE
| SWP_NOSIZE
| SWP_SHOWWINDOW
);
636 HANDLE filemap
, proc
;
637 PSID mapowner
, procowner
;
638 PSECURITY_DESCRIPTOR psd1
= NULL
, psd2
= NULL
;
641 cds
= (COPYDATASTRUCT
*)lParam
;
642 if (cds
->dwData
!= AGENT_COPYDATA_ID
)
643 return 0; /* not our message, mate */
644 mapname
= (char *)cds
->lpData
;
645 if (mapname
[cds
->cbData
- 1] != '\0')
646 return 0; /* failure to be ASCIZ! */
648 debug(("mapname is :%s:\r\n", mapname
));
650 filemap
= OpenFileMapping(FILE_MAP_ALL_ACCESS
, FALSE
, mapname
);
652 debug(("filemap is %p\r\n", filemap
));
654 if (filemap
!= NULL
&& filemap
!= INVALID_HANDLE_VALUE
) {
658 if ((proc
= OpenProcess(MAXIMUM_ALLOWED
, FALSE
,
659 GetCurrentProcessId())) == NULL
) {
661 debug(("couldn't get handle for process\r\n"));
665 if (getsecurityinfo(proc
, SE_KERNEL_OBJECT
,
666 OWNER_SECURITY_INFORMATION
,
667 &procowner
, NULL
, NULL
, NULL
,
668 &psd2
) != ERROR_SUCCESS
) {
670 debug(("couldn't get owner info for process\r\n"));
673 return 0; /* unable to get security info */
676 if ((rc
= getsecurityinfo(filemap
, SE_KERNEL_OBJECT
,
677 OWNER_SECURITY_INFORMATION
,
678 &mapowner
, NULL
, NULL
, NULL
,
679 &psd1
) != ERROR_SUCCESS
)) {
681 debug(("couldn't get owner info for filemap: %d\r\n", rc
));
686 debug(("got security stuff\r\n"));
688 if (!EqualSid(mapowner
, procowner
))
689 return 0; /* security ID mismatch! */
691 debug(("security stuff matched\r\n"));
697 debug(("security APIs not present\r\n"));
701 p
= MapViewOfFile(filemap
, FILE_MAP_WRITE
, 0, 0, 0);
703 debug(("p is %p\r\n", p
));
704 {int i
; for(i
=0;i
<5;i
++)debug(("p[%d]=%02x\r\n", i
, ((unsigned char *)p
)[i
]));}
710 CloseHandle(filemap
);
715 return DefWindowProc (hwnd
, message
, wParam
, lParam
);
718 int WINAPI
WinMain(HINSTANCE inst
, HINSTANCE prev
, LPSTR cmdline
, int show
) {
725 * Determine whether we're an NT system (should have security
726 * APIs) or a non-NT system (don't do security).
728 memset(&osi
, 0, sizeof(OSVERSIONINFO
));
729 osi
.dwOSVersionInfoSize
= sizeof(OSVERSIONINFO
);
730 if (GetVersionEx(&osi
) && osi
.dwPlatformId
==VER_PLATFORM_WIN32_NT
) {
733 has_security
= FALSE
;
738 * Attempt to ge the security API we need.
740 advapi
= LoadLibrary("ADVAPI32.DLL");
741 getsecurityinfo
= (gsi_fn_t
)GetProcAddress(advapi
, "GetSecurityInfo");
742 if (!getsecurityinfo
) {
744 "Unable to access security APIs. Pageant will\n"
745 "not run, in case it causes a security breach.",
746 "Pageant Fatal Error", MB_ICONERROR
| MB_OK
);
751 "This program has been compiled for Win9X and will\n"
752 "not run on NT, in case it causes a security breach.",
753 "Pageant Fatal Error", MB_ICONERROR
| MB_OK
);
760 * First bomb out totally if we are already running.
762 if (FindWindow("Pageant", "Pageant")) {
763 MessageBox(NULL
, "Pageant is already running", "Pageant Error",
764 MB_ICONERROR
| MB_OK
);
765 if (advapi
) FreeLibrary(advapi
);
773 wndclass
.lpfnWndProc
= WndProc
;
774 wndclass
.cbClsExtra
= 0;
775 wndclass
.cbWndExtra
= 0;
776 wndclass
.hInstance
= inst
;
777 wndclass
.hIcon
= LoadIcon (inst
,
778 MAKEINTRESOURCE(IDI_MAINICON
));
779 wndclass
.hCursor
= LoadCursor (NULL
, IDC_IBEAM
);
780 wndclass
.hbrBackground
= GetStockObject (BLACK_BRUSH
);
781 wndclass
.lpszMenuName
= NULL
;
782 wndclass
.lpszClassName
= APPNAME
;
784 RegisterClass (&wndclass
);
787 hwnd
= keylist
= NULL
;
789 hwnd
= CreateWindow (APPNAME
, APPNAME
,
790 WS_OVERLAPPEDWINDOW
| WS_VSCROLL
,
791 CW_USEDEFAULT
, CW_USEDEFAULT
,
792 100, 100, NULL
, NULL
, inst
, NULL
);
794 /* Set up a system tray icon */
800 #ifdef NIM_SETVERSION
802 res
= Shell_NotifyIcon(NIM_SETVERSION
, &tnid
);
805 tnid
.cbSize
= sizeof(NOTIFYICONDATA
);
807 tnid
.uID
= 1; /* unique within this systray use */
808 tnid
.uFlags
= NIF_MESSAGE
| NIF_ICON
| NIF_TIP
;
809 tnid
.uCallbackMessage
= WM_SYSTRAY
;
810 tnid
.hIcon
= hicon
= LoadIcon (instance
, MAKEINTRESOURCE(201));
811 strcpy(tnid
.szTip
, "Pageant (PuTTY authentication agent)");
813 res
= Shell_NotifyIcon(NIM_ADD
, &tnid
);
818 systray_menu
= CreatePopupMenu();
819 /* accelerators used: vkxa */
820 AppendMenu (systray_menu
, MF_ENABLED
, IDM_VIEWKEYS
, "&View Keys");
821 AppendMenu (systray_menu
, MF_ENABLED
, IDM_ADDKEY
, "Add &Key");
822 AppendMenu (systray_menu
, MF_ENABLED
, IDM_ABOUT
, "&About");
823 AppendMenu (systray_menu
, MF_ENABLED
, IDM_CLOSE
, "E&xit");
826 ShowWindow (hwnd
, SW_HIDE
);
829 * Initialise storage for RSA keys.
831 rsakeys
= newtree234(cmpkeys
);
834 * Process the command line and add RSA keys as listed on it.
841 while (*p
&& isspace(*p
)) p
++;
842 if (*p
&& !isspace(*p
)) {
843 char *q
= p
, *pp
= p
;
844 while (*p
&& (inquotes
|| !isspace(*p
)))
847 inquotes
= !inquotes
;
865 while (GetMessage(&msg
, NULL
, 0, 0) == 1) {
866 TranslateMessage(&msg
);
867 DispatchMessage(&msg
);
870 /* Clean up the system tray icon */
874 tnid
.cbSize
= sizeof(NOTIFYICONDATA
);
878 Shell_NotifyIcon(NIM_DELETE
, &tnid
);
880 DestroyMenu(systray_menu
);
883 if (advapi
) FreeLibrary(advapi
);