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 typedef DWORD (WINAPI *gsi_fn_t)
49 (HANDLE, SE_OBJECT_TYPE, SECURITY_INFORMATION,
50 PSID *, PSID *, PACL *, PACL *,
51 PSECURITY_DESCRIPTOR *);
52 gsi_fn_t getsecurityinfo;
55 * We need this to link with the RSA code, because rsaencrypt()
56 * pads its data with random bytes. Since we only use rsadecrypt(),
57 * which is deterministic, this should never be called.
59 * If it _is_ called, there is a _serious_ problem, because it
60 * won't generate true random numbers. So we must scream, panic,
61 * and exit immediately if that should happen.
63 int random_byte(void) {
64 MessageBox(hwnd, "Internal Error", APPNAME, MB_OK | MB_ICONERROR);
69 * This function is needed to link with the DES code. We need not
70 * have it do anything at all.
72 void logevent(char *msg) {
75 #define GET_32BIT(cp) \
76 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
77 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
78 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
79 ((unsigned long)(unsigned char)(cp)[3]))
81 #define PUT_32BIT(cp, value) { \
82 (cp)[0] = (unsigned char)((value) >> 24); \
83 (cp)[1] = (unsigned char)((value) >> 16); \
84 (cp)[2] = (unsigned char)((value) >> 8); \
85 (cp)[3] = (unsigned char)(value); }
87 #define PASSPHRASE_MAXLEN 512
89 struct PassphraseProcStruct {
95 * Dialog-box function for the passphrase box.
97 static int CALLBACK PassphraseProc(HWND hwnd, UINT msg,
98 WPARAM wParam, LPARAM lParam) {
99 static char *passphrase;
100 struct PassphraseProcStruct *p;
104 p = (struct PassphraseProcStruct *)lParam;
105 passphrase = p->passphrase;
107 SetDlgItemText(hwnd, 101, p->comment);
111 switch (LOWORD(wParam)) {
121 case 102: /* edit box */
122 if (HIWORD(wParam) == EN_CHANGE) {
123 GetDlgItemText (hwnd, 102, passphrase, PASSPHRASE_MAXLEN-1);
124 passphrase[PASSPHRASE_MAXLEN-1] = '\0';
137 * Update the visible key list.
139 void keylist_update(void) {
144 SendDlgItemMessage(keylist, 100, LB_RESETCONTENT, 0, 0);
145 for (key = first234(rsakeys, &e); key; key = next234(&e)) {
146 char listentry[512], *p;
148 * Replace two spaces in the fingerprint with tabs, for
149 * nice alignment in the box.
151 rsa_fingerprint(listentry, sizeof(listentry), key);
152 p = strchr(listentry, ' '); if (p) *p = '\t';
153 p = strchr(listentry, ' '); if (p) *p = '\t';
154 SendDlgItemMessage (keylist, 100, LB_ADDSTRING,
155 0, (LPARAM)listentry);
157 SendDlgItemMessage (keylist, 100, LB_SETCURSEL, (WPARAM) -1, 0);
162 * This function loads a key from a file and adds it.
164 void add_keyfile(char *filename) {
165 char passphrase[PASSPHRASE_MAXLEN];
171 struct PassphraseProcStruct pps;
173 needs_pass = rsakey_encrypted(filename, &comment);
175 key = malloc(sizeof(*key));
176 pps.passphrase = passphrase;
177 pps.comment = comment;
181 dlgret = DialogBoxParam(instance, MAKEINTRESOURCE(210),
182 NULL, PassphraseProc,
185 if (comment) free(comment);
187 return; /* operation cancelled */
191 ret = loadrsakey(filename, key, passphrase);
194 if (comment) free(comment);
196 MessageBox(NULL, "Couldn't load public key.", APPNAME,
197 MB_OK | MB_ICONERROR);
201 if (add234(rsakeys, key) != key)
202 free(key); /* already present, don't waste RAM */
206 * This is the main agent function that answers messages.
208 void answer_msg(void *msg) {
209 unsigned char *p = msg;
210 unsigned char *ret = msg;
214 * Get the message type.
220 case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
222 * Reply with SSH_AGENT_RSA_IDENTITIES_ANSWER.
230 * Count up the number and length of keys we hold.
233 for (key = first234(rsakeys, &e); key; key = next234(&e)) {
235 len += 4; /* length field */
236 len += ssh1_bignum_length(key->exponent);
237 len += ssh1_bignum_length(key->modulus);
238 len += 4 + strlen(key->comment);
242 * Packet header is the obvious five bytes, plus four
243 * bytes for the key count.
246 if (len > AGENT_MAX_MSGLEN)
247 goto failure; /* aaargh! too much stuff! */
248 PUT_32BIT(ret, len-4);
249 ret[4] = SSH_AGENT_RSA_IDENTITIES_ANSWER;
250 PUT_32BIT(ret+5, nkeys);
252 for (key = first234(rsakeys, &e); key; key = next234(&e)) {
253 PUT_32BIT(p, ssh1_bignum_bitcount(key->modulus));
255 p += ssh1_write_bignum(p, key->exponent);
256 p += ssh1_write_bignum(p, key->modulus);
257 PUT_32BIT(p, strlen(key->comment));
258 memcpy(p+4, key->comment, strlen(key->comment));
259 p += 4 + strlen(key->comment);
263 case SSH_AGENTC_RSA_CHALLENGE:
265 * Reply with either SSH_AGENT_RSA_RESPONSE or
266 * SSH_AGENT_FAILURE, depending on whether we have that key
270 struct RSAKey reqkey, *key;
271 Bignum challenge, response;
272 unsigned char response_source[48], response_md5[16];
273 struct MD5Context md5c;
277 p += ssh1_read_bignum(p, &reqkey.exponent);
278 p += ssh1_read_bignum(p, &reqkey.modulus);
279 p += ssh1_read_bignum(p, &challenge);
280 memcpy(response_source+32, p, 16); p += 16;
281 if (GET_32BIT(p) != 1 ||
282 (key = find234(rsakeys, &reqkey, NULL)) == NULL) {
283 freebn(reqkey.exponent);
284 freebn(reqkey.modulus);
288 response = rsadecrypt(challenge, key);
289 for (i = 0; i < 32; i++)
290 response_source[i] = bignum_byte(response, 31-i);
293 MD5Update(&md5c, response_source, 48);
294 MD5Final(response_md5, &md5c);
295 memset(response_source, 0, 48); /* burn the evidence */
296 freebn(response); /* and that evidence */
297 freebn(challenge); /* yes, and that evidence */
298 freebn(reqkey.exponent); /* and free some memory ... */
299 freebn(reqkey.modulus); /* ... while we're at it. */
302 * Packet is the obvious five byte header, plus sixteen
306 PUT_32BIT(ret, len-4);
307 ret[4] = SSH_AGENT_RSA_RESPONSE;
308 memcpy(ret+5, response_md5, 16);
311 case SSH_AGENTC_ADD_RSA_IDENTITY:
313 * Add to the list and return SSH_AGENT_SUCCESS, or
314 * SSH_AGENT_FAILURE if the key was malformed.
319 key = malloc(sizeof(struct RSAKey));
320 memset(key, 0, sizeof(key));
321 p += makekey(p, key, NULL, 1);
322 p += makeprivate(p, key);
323 p += ssh1_read_bignum(p, NULL); /* p^-1 mod q */
324 p += ssh1_read_bignum(p, NULL); /* p */
325 p += ssh1_read_bignum(p, NULL); /* q */
326 comment = malloc(GET_32BIT(p));
328 memcpy(comment, p+4, GET_32BIT(p));
329 key->comment = comment;
332 ret[4] = SSH_AGENT_FAILURE;
333 if (add234(rsakeys, key) == key) {
335 ret[4] = SSH_AGENT_SUCCESS;
342 case SSH_AGENTC_REMOVE_RSA_IDENTITY:
344 * Remove from the list and return SSH_AGENT_SUCCESS, or
345 * perhaps SSH_AGENT_FAILURE if it wasn't in the list to
349 struct RSAKey reqkey, *key;
351 p += makekey(p, &reqkey, NULL, 0);
352 key = find234(rsakeys, &reqkey, NULL);
353 freebn(reqkey.exponent);
354 freebn(reqkey.modulus);
356 ret[4] = SSH_AGENT_FAILURE;
358 del234(rsakeys, key);
361 ret[4] = SSH_AGENT_SUCCESS;
368 * Unrecognised message. Return SSH_AGENT_FAILURE.
371 ret[4] = SSH_AGENT_FAILURE;
377 * Key comparison function for the 2-3-4 tree of RSA keys.
379 int cmpkeys(void *av, void *bv) {
380 struct RSAKey *a = (struct RSAKey *)av;
381 struct RSAKey *b = (struct RSAKey *)bv;
388 * Compare by length of moduli.
390 alen = ssh1_bignum_bitcount(am);
391 blen = ssh1_bignum_bitcount(bm);
392 if (alen > blen) return +1; else if (alen < blen) return -1;
394 * Now compare by moduli themselves.
396 alen = (alen + 7) / 8; /* byte count */
399 abyte = bignum_byte(am, alen);
400 bbyte = bignum_byte(bm, alen);
401 if (abyte > bbyte) return +1; else if (abyte < bbyte) return -1;
409 static void error(char *s) {
410 MessageBox(hwnd, s, APPNAME, MB_OK | MB_ICONERROR);
414 * Dialog-box function for the key list box.
416 static int CALLBACK KeyListProc(HWND hwnd, UINT msg,
417 WPARAM wParam, LPARAM lParam) {
421 char filename[FILENAME_MAX];
427 static int tabs[2] = {25, 175};
428 SendDlgItemMessage (hwnd, 100, LB_SETTABSTOPS, 2,
434 switch (LOWORD(wParam)) {
440 case 101: /* add key */
441 if (HIWORD(wParam) == BN_CLICKED ||
442 HIWORD(wParam) == BN_DOUBLECLICKED) {
443 memset(&of, 0, sizeof(of));
444 #ifdef OPENFILENAME_SIZE_VERSION_400
445 of.lStructSize = OPENFILENAME_SIZE_VERSION_400;
447 of.lStructSize = sizeof(of);
450 of.lpstrFilter = "All Files\0*\0\0\0";
451 of.lpstrCustomFilter = NULL;
453 of.lpstrFile = filename; *filename = '\0';
454 of.nMaxFile = sizeof(filename);
455 of.lpstrFileTitle = NULL;
456 of.lpstrInitialDir = NULL;
457 of.lpstrTitle = "Select Public Key File";
459 if (GetOpenFileName(&of)) {
460 add_keyfile(filename);
465 case 102: /* remove key */
466 if (HIWORD(wParam) == BN_CLICKED ||
467 HIWORD(wParam) == BN_DOUBLECLICKED) {
468 int n = SendDlgItemMessage (hwnd, 100, LB_GETCURSEL, 0, 0);
469 if (n == LB_ERR || n == 0) {
473 for (key = first234(rsakeys, &e); key; key = next234(&e))
476 del234(rsakeys, key);
477 freersakey(key); free(key);
491 static LRESULT CALLBACK WndProc (HWND hwnd, UINT message,
492 WPARAM wParam, LPARAM lParam) {
494 static int menuinprogress;
498 if (lParam == WM_RBUTTONUP) {
500 GetCursorPos(&cursorpos);
501 PostMessage(hwnd, WM_SYSTRAY2, cursorpos.x, cursorpos.y);
502 } else if (lParam == WM_LBUTTONDBLCLK) {
503 /* Equivalent to IDM_VIEWKEYS. */
504 PostMessage(hwnd, WM_COMMAND, IDM_VIEWKEYS, 0);
508 if (!menuinprogress) {
510 SetForegroundWindow(hwnd);
511 ret = TrackPopupMenu(systray_menu,
512 TPM_RIGHTALIGN | TPM_BOTTOMALIGN |
514 wParam, lParam, 0, hwnd, NULL);
520 switch (wParam & ~0xF) { /* low 4 bits reserved to Windows */
522 SendMessage(hwnd, WM_CLOSE, 0, 0);
526 keylist = CreateDialog (instance, MAKEINTRESOURCE(211),
528 ShowWindow (keylist, SW_SHOWNORMAL);
530 * Sometimes the window comes up minimised / hidden
531 * for no obvious reason. Prevent this.
533 SetForegroundWindow(keylist);
534 SetWindowPos (keylist, HWND_TOP, 0, 0, 0, 0,
535 SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
548 HANDLE filemap, proc;
549 PSID mapowner, procowner;
550 PSECURITY_DESCRIPTOR psd1 = NULL, psd2 = NULL;
553 cds = (COPYDATASTRUCT *)lParam;
554 if (cds->dwData != AGENT_COPYDATA_ID)
555 return 0; /* not our message, mate */
556 mapname = (char *)cds->lpData;
557 if (mapname[cds->cbData - 1] != '\0')
558 return 0; /* failure to be ASCIZ! */
560 debug(("mapname is :%s:\r\n", mapname));
562 filemap = OpenFileMapping(FILE_MAP_ALL_ACCESS, FALSE, mapname);
564 debug(("filemap is %p\r\n", filemap));
566 if (filemap != NULL && filemap != INVALID_HANDLE_VALUE) {
569 if ((proc = OpenProcess(MAXIMUM_ALLOWED, FALSE,
570 GetCurrentProcessId())) == NULL) {
572 debug(("couldn't get handle for process\r\n"));
576 if (getsecurityinfo(proc, SE_KERNEL_OBJECT,
577 OWNER_SECURITY_INFORMATION,
578 &procowner, NULL, NULL, NULL,
579 &psd2) != ERROR_SUCCESS) {
581 debug(("couldn't get owner info for process\r\n"));
584 return 0; /* unable to get security info */
587 if ((rc = getsecurityinfo(filemap, SE_KERNEL_OBJECT,
588 OWNER_SECURITY_INFORMATION,
589 &mapowner, NULL, NULL, NULL,
590 &psd1) != ERROR_SUCCESS)) {
592 debug(("couldn't get owner info for filemap: %d\r\n", rc));
597 debug(("got security stuff\r\n"));
599 if (!EqualSid(mapowner, procowner))
600 return 0; /* security ID mismatch! */
602 debug(("security stuff matched\r\n"));
608 debug(("security APIs not present\r\n"));
611 p = MapViewOfFile(filemap, FILE_MAP_WRITE, 0, 0, 0);
613 debug(("p is %p\r\n", p));
614 {int i; for(i=0;i<5;i++)debug(("p[%d]=%02x\r\n", i, ((unsigned char *)p)[i]));}
620 CloseHandle(filemap);
625 return DefWindowProc (hwnd, message, wParam, lParam);
628 int WINAPI WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmdline, int show) {
635 * Determine whether we're an NT system (should have security
636 * APIs) or a non-NT system (don't do security).
638 memset(&osi, 0, sizeof(OSVERSIONINFO));
639 osi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
640 if (GetVersionEx(&osi) && osi.dwPlatformId==VER_PLATFORM_WIN32_NT) {
643 has_security = FALSE;
647 * Attempt to ge the security API we need.
649 advapi = LoadLibrary("ADVAPI32.DLL");
650 getsecurityinfo = (gsi_fn_t)GetProcAddress(advapi, "GetSecurityInfo");
651 if (!getsecurityinfo) {
653 "Unable to access security APIs. Pageant will\n"
654 "not run, in case it causes a security breach.",
655 "Pageant Fatal Error", MB_ICONERROR | MB_OK);
662 * First bomb out totally if we are already running.
664 if (FindWindow("Pageant", "Pageant")) {
665 MessageBox(NULL, "Pageant is already running", "Pageant Error",
666 MB_ICONERROR | MB_OK);
667 if (advapi) FreeLibrary(advapi);
675 wndclass.lpfnWndProc = WndProc;
676 wndclass.cbClsExtra = 0;
677 wndclass.cbWndExtra = 0;
678 wndclass.hInstance = inst;
679 wndclass.hIcon = LoadIcon (inst,
680 MAKEINTRESOURCE(IDI_MAINICON));
681 wndclass.hCursor = LoadCursor (NULL, IDC_IBEAM);
682 wndclass.hbrBackground = GetStockObject (BLACK_BRUSH);
683 wndclass.lpszMenuName = NULL;
684 wndclass.lpszClassName = APPNAME;
686 RegisterClass (&wndclass);
689 hwnd = keylist = NULL;
691 hwnd = CreateWindow (APPNAME, APPNAME,
692 WS_OVERLAPPEDWINDOW | WS_VSCROLL,
693 CW_USEDEFAULT, CW_USEDEFAULT,
694 100, 100, NULL, NULL, inst, NULL);
696 /* Set up a system tray icon */
702 #ifdef NIM_SETVERSION
704 res = Shell_NotifyIcon(NIM_SETVERSION, &tnid);
707 tnid.cbSize = sizeof(NOTIFYICONDATA);
709 tnid.uID = 1; /* unique within this systray use */
710 tnid.uFlags = NIF_MESSAGE | NIF_ICON | NIF_TIP;
711 tnid.uCallbackMessage = WM_SYSTRAY;
712 tnid.hIcon = hicon = LoadIcon (instance, MAKEINTRESOURCE(201));
713 strcpy(tnid.szTip, "Pageant (PuTTY authentication agent)");
715 res = Shell_NotifyIcon(NIM_ADD, &tnid);
720 systray_menu = CreatePopupMenu();
721 AppendMenu (systray_menu, MF_ENABLED, IDM_VIEWKEYS, "&View Keys");
722 AppendMenu (systray_menu, MF_ENABLED, IDM_CLOSE, "E&xit");
725 ShowWindow (hwnd, SW_HIDE);
728 * Initialise storage for RSA keys.
730 rsakeys = newtree234(cmpkeys);
733 * Process the command line and add RSA keys as listed on it.
740 while (*p && isspace(*p)) p++;
741 if (*p && !isspace(*p)) {
742 char *q = p, *pp = p;
743 while (*p && (inquotes || !isspace(*p)))
746 inquotes = !inquotes;
764 while (GetMessage(&msg, NULL, 0, 0) == 1) {
765 TranslateMessage(&msg);
766 DispatchMessage(&msg);
769 /* Clean up the system tray icon */
773 tnid.cbSize = sizeof(NOTIFYICONDATA);
777 Shell_NotifyIcon(NIM_DELETE, &tnid);
779 DestroyMenu(systray_menu);
782 if (advapi) FreeLibrary(advapi);