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_ABOUT 0x0030
31 #define APPNAME "Pageant"
33 #define SSH_AGENTC_REQUEST_RSA_IDENTITIES 1
34 #define SSH_AGENT_RSA_IDENTITIES_ANSWER 2
35 #define SSH_AGENTC_RSA_CHALLENGE 3
36 #define SSH_AGENT_RSA_RESPONSE 4
37 #define SSH_AGENT_FAILURE 5
38 #define SSH_AGENT_SUCCESS 6
39 #define SSH_AGENTC_ADD_RSA_IDENTITY 7
40 #define SSH_AGENTC_REMOVE_RSA_IDENTITY 8
44 static HINSTANCE instance;
48 static HMENU systray_menu;
50 static tree234 *rsakeys;
52 static int has_security;
54 typedef DWORD (WINAPI *gsi_fn_t)
55 (HANDLE, SE_OBJECT_TYPE, SECURITY_INFORMATION,
56 PSID *, PSID *, PACL *, PACL *,
57 PSECURITY_DESCRIPTOR *);
58 static gsi_fn_t getsecurityinfo;
62 * We need this to link with the RSA code, because rsaencrypt()
63 * pads its data with random bytes. Since we only use rsadecrypt(),
64 * which is deterministic, this should never be called.
66 * If it _is_ called, there is a _serious_ problem, because it
67 * won't generate true random numbers. So we must scream, panic,
68 * and exit immediately if that should happen.
70 int random_byte(void) {
71 MessageBox(hwnd, "Internal Error", APPNAME, MB_OK | MB_ICONERROR);
76 * This function is needed to link with the DES code. We need not
77 * have it do anything at all.
79 void logevent(char *msg) {
82 #define GET_32BIT(cp) \
83 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
84 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
85 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
86 ((unsigned long)(unsigned char)(cp)[3]))
88 #define PUT_32BIT(cp, value) { \
89 (cp)[0] = (unsigned char)((value) >> 24); \
90 (cp)[1] = (unsigned char)((value) >> 16); \
91 (cp)[2] = (unsigned char)((value) >> 8); \
92 (cp)[3] = (unsigned char)(value); }
94 #define PASSPHRASE_MAXLEN 512
96 struct PassphraseProcStruct {
102 * Dialog-box function for the Licence box.
104 static int CALLBACK LicenceProc (HWND hwnd, UINT msg,
105 WPARAM wParam, LPARAM lParam) {
110 switch (LOWORD(wParam)) {
124 * Dialog-box function for the About box.
126 static int CALLBACK AboutProc (HWND hwnd, UINT msg,
127 WPARAM wParam, LPARAM lParam) {
130 SetDlgItemText (hwnd, 100, ver);
133 switch (LOWORD(wParam)) {
136 DestroyWindow (hwnd);
139 EnableWindow(hwnd, 0);
140 DialogBox (instance, MAKEINTRESOURCE(214), NULL, LicenceProc);
141 EnableWindow(hwnd, 1);
142 SetActiveWindow(hwnd);
148 DestroyWindow (hwnd);
155 * Dialog-box function for the passphrase box.
157 static int CALLBACK PassphraseProc(HWND hwnd, UINT msg,
158 WPARAM wParam, LPARAM lParam) {
159 static char *passphrase;
160 struct PassphraseProcStruct *p;
164 p = (struct PassphraseProcStruct *)lParam;
165 passphrase = p->passphrase;
167 SetDlgItemText(hwnd, 101, p->comment);
171 switch (LOWORD(wParam)) {
181 case 102: /* edit box */
182 if (HIWORD(wParam) == EN_CHANGE) {
183 GetDlgItemText (hwnd, 102, passphrase, PASSPHRASE_MAXLEN-1);
184 passphrase[PASSPHRASE_MAXLEN-1] = '\0';
197 * Update the visible key list.
199 static void keylist_update(void) {
204 SendDlgItemMessage(keylist, 100, LB_RESETCONTENT, 0, 0);
205 for (key = first234(rsakeys, &e); key; key = next234(&e)) {
206 char listentry[512], *p;
208 * Replace two spaces in the fingerprint with tabs, for
209 * nice alignment in the box.
211 rsa_fingerprint(listentry, sizeof(listentry), key);
212 p = strchr(listentry, ' '); if (p) *p = '\t';
213 p = strchr(listentry, ' '); if (p) *p = '\t';
214 SendDlgItemMessage (keylist, 100, LB_ADDSTRING,
215 0, (LPARAM)listentry);
217 SendDlgItemMessage (keylist, 100, LB_SETCURSEL, (WPARAM) -1, 0);
222 * This function loads a key from a file and adds it.
224 static void add_keyfile(char *filename) {
225 char passphrase[PASSPHRASE_MAXLEN];
231 struct PassphraseProcStruct pps;
233 needs_pass = rsakey_encrypted(filename, &comment);
235 key = malloc(sizeof(*key));
236 pps.passphrase = passphrase;
237 pps.comment = comment;
241 dlgret = DialogBoxParam(instance, MAKEINTRESOURCE(210),
242 NULL, PassphraseProc,
245 if (comment) free(comment);
247 return; /* operation cancelled */
251 ret = loadrsakey(filename, key, passphrase);
254 if (comment) free(comment);
256 MessageBox(NULL, "Couldn't load private key.", APPNAME,
257 MB_OK | MB_ICONERROR);
261 if (add234(rsakeys, key) != key)
262 free(key); /* already present, don't waste RAM */
266 * This is the main agent function that answers messages.
268 static void answer_msg(void *msg) {
269 unsigned char *p = msg;
270 unsigned char *ret = msg;
274 * Get the message type.
280 case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
282 * Reply with SSH_AGENT_RSA_IDENTITIES_ANSWER.
290 * Count up the number and length of keys we hold.
293 for (key = first234(rsakeys, &e); key; key = next234(&e)) {
295 len += 4; /* length field */
296 len += ssh1_bignum_length(key->exponent);
297 len += ssh1_bignum_length(key->modulus);
298 len += 4 + strlen(key->comment);
302 * Packet header is the obvious five bytes, plus four
303 * bytes for the key count.
306 if (len > AGENT_MAX_MSGLEN)
307 goto failure; /* aaargh! too much stuff! */
308 PUT_32BIT(ret, len-4);
309 ret[4] = SSH_AGENT_RSA_IDENTITIES_ANSWER;
310 PUT_32BIT(ret+5, nkeys);
312 for (key = first234(rsakeys, &e); key; key = next234(&e)) {
313 PUT_32BIT(p, ssh1_bignum_bitcount(key->modulus));
315 p += ssh1_write_bignum(p, key->exponent);
316 p += ssh1_write_bignum(p, key->modulus);
317 PUT_32BIT(p, strlen(key->comment));
318 memcpy(p+4, key->comment, strlen(key->comment));
319 p += 4 + strlen(key->comment);
323 case SSH_AGENTC_RSA_CHALLENGE:
325 * Reply with either SSH_AGENT_RSA_RESPONSE or
326 * SSH_AGENT_FAILURE, depending on whether we have that key
330 struct RSAKey reqkey, *key;
331 Bignum challenge, response;
332 unsigned char response_source[48], response_md5[16];
333 struct MD5Context md5c;
337 p += ssh1_read_bignum(p, &reqkey.exponent);
338 p += ssh1_read_bignum(p, &reqkey.modulus);
339 p += ssh1_read_bignum(p, &challenge);
340 memcpy(response_source+32, p, 16); p += 16;
341 if (GET_32BIT(p) != 1 ||
342 (key = find234(rsakeys, &reqkey, NULL)) == NULL) {
343 freebn(reqkey.exponent);
344 freebn(reqkey.modulus);
348 response = rsadecrypt(challenge, key);
349 for (i = 0; i < 32; i++)
350 response_source[i] = bignum_byte(response, 31-i);
353 MD5Update(&md5c, response_source, 48);
354 MD5Final(response_md5, &md5c);
355 memset(response_source, 0, 48); /* burn the evidence */
356 freebn(response); /* and that evidence */
357 freebn(challenge); /* yes, and that evidence */
358 freebn(reqkey.exponent); /* and free some memory ... */
359 freebn(reqkey.modulus); /* ... while we're at it. */
362 * Packet is the obvious five byte header, plus sixteen
366 PUT_32BIT(ret, len-4);
367 ret[4] = SSH_AGENT_RSA_RESPONSE;
368 memcpy(ret+5, response_md5, 16);
371 case SSH_AGENTC_ADD_RSA_IDENTITY:
373 * Add to the list and return SSH_AGENT_SUCCESS, or
374 * SSH_AGENT_FAILURE if the key was malformed.
379 key = malloc(sizeof(struct RSAKey));
380 memset(key, 0, sizeof(key));
381 p += makekey(p, key, NULL, 1);
382 p += makeprivate(p, key);
383 p += ssh1_read_bignum(p, NULL); /* p^-1 mod q */
384 p += ssh1_read_bignum(p, NULL); /* p */
385 p += ssh1_read_bignum(p, NULL); /* q */
386 comment = malloc(GET_32BIT(p));
388 memcpy(comment, p+4, GET_32BIT(p));
389 key->comment = comment;
392 ret[4] = SSH_AGENT_FAILURE;
393 if (add234(rsakeys, key) == key) {
395 ret[4] = SSH_AGENT_SUCCESS;
402 case SSH_AGENTC_REMOVE_RSA_IDENTITY:
404 * Remove from the list and return SSH_AGENT_SUCCESS, or
405 * perhaps SSH_AGENT_FAILURE if it wasn't in the list to
409 struct RSAKey reqkey, *key;
411 p += makekey(p, &reqkey, NULL, 0);
412 key = find234(rsakeys, &reqkey, NULL);
413 freebn(reqkey.exponent);
414 freebn(reqkey.modulus);
416 ret[4] = SSH_AGENT_FAILURE;
418 del234(rsakeys, key);
421 ret[4] = SSH_AGENT_SUCCESS;
428 * Unrecognised message. Return SSH_AGENT_FAILURE.
431 ret[4] = SSH_AGENT_FAILURE;
437 * Key comparison function for the 2-3-4 tree of RSA keys.
439 static int cmpkeys(void *av, void *bv) {
440 struct RSAKey *a = (struct RSAKey *)av;
441 struct RSAKey *b = (struct RSAKey *)bv;
448 * Compare by length of moduli.
450 alen = ssh1_bignum_bitcount(am);
451 blen = ssh1_bignum_bitcount(bm);
452 if (alen > blen) return +1; else if (alen < blen) return -1;
454 * Now compare by moduli themselves.
456 alen = (alen + 7) / 8; /* byte count */
459 abyte = bignum_byte(am, alen);
460 bbyte = bignum_byte(bm, alen);
461 if (abyte > bbyte) return +1; else if (abyte < bbyte) return -1;
469 static void error(char *s) {
470 MessageBox(hwnd, s, APPNAME, MB_OK | MB_ICONERROR);
474 * Dialog-box function for the key list box.
476 static int CALLBACK KeyListProc(HWND hwnd, UINT msg,
477 WPARAM wParam, LPARAM lParam) {
481 char filename[FILENAME_MAX];
487 static int tabs[2] = {25, 175};
488 SendDlgItemMessage (hwnd, 100, LB_SETTABSTOPS, 2,
494 switch (LOWORD(wParam)) {
500 case 101: /* add key */
501 if (HIWORD(wParam) == BN_CLICKED ||
502 HIWORD(wParam) == BN_DOUBLECLICKED) {
503 memset(&of, 0, sizeof(of));
504 #ifdef OPENFILENAME_SIZE_VERSION_400
505 of.lStructSize = OPENFILENAME_SIZE_VERSION_400;
507 of.lStructSize = sizeof(of);
510 of.lpstrFilter = "All Files\0*\0\0\0";
511 of.lpstrCustomFilter = NULL;
513 of.lpstrFile = filename; *filename = '\0';
514 of.nMaxFile = sizeof(filename);
515 of.lpstrFileTitle = NULL;
516 of.lpstrInitialDir = NULL;
517 of.lpstrTitle = "Select Private Key File";
519 if (GetOpenFileName(&of)) {
520 add_keyfile(filename);
525 case 102: /* remove key */
526 if (HIWORD(wParam) == BN_CLICKED ||
527 HIWORD(wParam) == BN_DOUBLECLICKED) {
528 int n = SendDlgItemMessage (hwnd, 100, LB_GETCURSEL, 0, 0);
533 for (key = first234(rsakeys, &e); key; key = next234(&e))
536 del234(rsakeys, key);
537 freersakey(key); free(key);
551 static LRESULT CALLBACK WndProc (HWND hwnd, UINT message,
552 WPARAM wParam, LPARAM lParam) {
554 static int menuinprogress;
558 if (lParam == WM_RBUTTONUP) {
560 GetCursorPos(&cursorpos);
561 PostMessage(hwnd, WM_SYSTRAY2, cursorpos.x, cursorpos.y);
562 } else if (lParam == WM_LBUTTONDBLCLK) {
563 /* Equivalent to IDM_VIEWKEYS. */
564 PostMessage(hwnd, WM_COMMAND, IDM_VIEWKEYS, 0);
568 if (!menuinprogress) {
570 SetForegroundWindow(hwnd);
571 ret = TrackPopupMenu(systray_menu,
572 TPM_RIGHTALIGN | TPM_BOTTOMALIGN |
574 wParam, lParam, 0, hwnd, NULL);
580 switch (wParam & ~0xF) { /* low 4 bits reserved to Windows */
582 SendMessage(hwnd, WM_CLOSE, 0, 0);
586 keylist = CreateDialog (instance, MAKEINTRESOURCE(211),
588 ShowWindow (keylist, SW_SHOWNORMAL);
590 * Sometimes the window comes up minimised / hidden
591 * for no obvious reason. Prevent this.
593 SetForegroundWindow(keylist);
594 SetWindowPos (keylist, HWND_TOP, 0, 0, 0, 0,
595 SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
600 aboutbox = CreateDialog (instance, MAKEINTRESOURCE(213),
602 ShowWindow (aboutbox, SW_SHOWNORMAL);
604 * Sometimes the window comes up minimised / hidden
605 * for no obvious reason. Prevent this.
607 SetForegroundWindow(aboutbox);
608 SetWindowPos (aboutbox, HWND_TOP, 0, 0, 0, 0,
609 SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
622 HANDLE filemap, proc;
623 PSID mapowner, procowner;
624 PSECURITY_DESCRIPTOR psd1 = NULL, psd2 = NULL;
627 cds = (COPYDATASTRUCT *)lParam;
628 if (cds->dwData != AGENT_COPYDATA_ID)
629 return 0; /* not our message, mate */
630 mapname = (char *)cds->lpData;
631 if (mapname[cds->cbData - 1] != '\0')
632 return 0; /* failure to be ASCIZ! */
634 debug(("mapname is :%s:\r\n", mapname));
636 filemap = OpenFileMapping(FILE_MAP_ALL_ACCESS, FALSE, mapname);
638 debug(("filemap is %p\r\n", filemap));
640 if (filemap != NULL && filemap != INVALID_HANDLE_VALUE) {
644 if ((proc = OpenProcess(MAXIMUM_ALLOWED, FALSE,
645 GetCurrentProcessId())) == NULL) {
647 debug(("couldn't get handle for process\r\n"));
651 if (getsecurityinfo(proc, SE_KERNEL_OBJECT,
652 OWNER_SECURITY_INFORMATION,
653 &procowner, NULL, NULL, NULL,
654 &psd2) != ERROR_SUCCESS) {
656 debug(("couldn't get owner info for process\r\n"));
659 return 0; /* unable to get security info */
662 if ((rc = getsecurityinfo(filemap, SE_KERNEL_OBJECT,
663 OWNER_SECURITY_INFORMATION,
664 &mapowner, NULL, NULL, NULL,
665 &psd1) != ERROR_SUCCESS)) {
667 debug(("couldn't get owner info for filemap: %d\r\n", rc));
672 debug(("got security stuff\r\n"));
674 if (!EqualSid(mapowner, procowner))
675 return 0; /* security ID mismatch! */
677 debug(("security stuff matched\r\n"));
683 debug(("security APIs not present\r\n"));
687 p = MapViewOfFile(filemap, FILE_MAP_WRITE, 0, 0, 0);
689 debug(("p is %p\r\n", p));
690 {int i; for(i=0;i<5;i++)debug(("p[%d]=%02x\r\n", i, ((unsigned char *)p)[i]));}
696 CloseHandle(filemap);
701 return DefWindowProc (hwnd, message, wParam, lParam);
704 int WINAPI WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmdline, int show) {
711 * Determine whether we're an NT system (should have security
712 * APIs) or a non-NT system (don't do security).
714 memset(&osi, 0, sizeof(OSVERSIONINFO));
715 osi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
716 if (GetVersionEx(&osi) && osi.dwPlatformId==VER_PLATFORM_WIN32_NT) {
719 has_security = FALSE;
724 * Attempt to ge the security API we need.
726 advapi = LoadLibrary("ADVAPI32.DLL");
727 getsecurityinfo = (gsi_fn_t)GetProcAddress(advapi, "GetSecurityInfo");
728 if (!getsecurityinfo) {
730 "Unable to access security APIs. Pageant will\n"
731 "not run, in case it causes a security breach.",
732 "Pageant Fatal Error", MB_ICONERROR | MB_OK);
737 "This program has been compiled for Win9X and will\n"
738 "not run on NT, in case it causes a security breach.",
739 "Pageant Fatal Error", MB_ICONERROR | MB_OK);
746 * First bomb out totally if we are already running.
748 if (FindWindow("Pageant", "Pageant")) {
749 MessageBox(NULL, "Pageant is already running", "Pageant Error",
750 MB_ICONERROR | MB_OK);
751 if (advapi) FreeLibrary(advapi);
759 wndclass.lpfnWndProc = WndProc;
760 wndclass.cbClsExtra = 0;
761 wndclass.cbWndExtra = 0;
762 wndclass.hInstance = inst;
763 wndclass.hIcon = LoadIcon (inst,
764 MAKEINTRESOURCE(IDI_MAINICON));
765 wndclass.hCursor = LoadCursor (NULL, IDC_IBEAM);
766 wndclass.hbrBackground = GetStockObject (BLACK_BRUSH);
767 wndclass.lpszMenuName = NULL;
768 wndclass.lpszClassName = APPNAME;
770 RegisterClass (&wndclass);
773 hwnd = keylist = NULL;
775 hwnd = CreateWindow (APPNAME, APPNAME,
776 WS_OVERLAPPEDWINDOW | WS_VSCROLL,
777 CW_USEDEFAULT, CW_USEDEFAULT,
778 100, 100, NULL, NULL, inst, NULL);
780 /* Set up a system tray icon */
786 #ifdef NIM_SETVERSION
788 res = Shell_NotifyIcon(NIM_SETVERSION, &tnid);
791 tnid.cbSize = sizeof(NOTIFYICONDATA);
793 tnid.uID = 1; /* unique within this systray use */
794 tnid.uFlags = NIF_MESSAGE | NIF_ICON | NIF_TIP;
795 tnid.uCallbackMessage = WM_SYSTRAY;
796 tnid.hIcon = hicon = LoadIcon (instance, MAKEINTRESOURCE(201));
797 strcpy(tnid.szTip, "Pageant (PuTTY authentication agent)");
799 res = Shell_NotifyIcon(NIM_ADD, &tnid);
804 systray_menu = CreatePopupMenu();
805 /* accelerators used: vxa */
806 AppendMenu (systray_menu, MF_ENABLED, IDM_VIEWKEYS, "&View Keys");
807 AppendMenu (systray_menu, MF_ENABLED, IDM_ABOUT, "&About");
808 AppendMenu (systray_menu, MF_ENABLED, IDM_CLOSE, "E&xit");
811 ShowWindow (hwnd, SW_HIDE);
814 * Initialise storage for RSA keys.
816 rsakeys = newtree234(cmpkeys);
819 * Process the command line and add RSA keys as listed on it.
826 while (*p && isspace(*p)) p++;
827 if (*p && !isspace(*p)) {
828 char *q = p, *pp = p;
829 while (*p && (inquotes || !isspace(*p)))
832 inquotes = !inquotes;
850 while (GetMessage(&msg, NULL, 0, 0) == 1) {
851 TranslateMessage(&msg);
852 DispatchMessage(&msg);
855 /* Clean up the system tray icon */
859 tnid.cbSize = sizeof(NOTIFYICONDATA);
863 Shell_NotifyIcon(NIM_DELETE, &tnid);
865 DestroyMenu(systray_menu);
868 if (advapi) FreeLibrary(advapi);