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50ac337dcf4b68fb47871c505121f3cac2f31d06
[u/mdw/putty] / pageant.c
1 /*
2 * Pageant: the PuTTY Authentication Agent.
3 */
4
5 #include <windows.h>
6 #ifndef NO_SECURITY
7 #include <aclapi.h>
8 #endif
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <ctype.h>
12 #include <tchar.h>
13
14 #include "ssh.h"
15 #include "tree234.h"
16
17 #define IDI_MAINICON 200
18 #define IDI_TRAYICON 201
19
20 #define WM_XUSER (WM_USER + 0x2000)
21 #define WM_SYSTRAY (WM_XUSER + 6)
22 #define WM_SYSTRAY2 (WM_XUSER + 7)
23
24 #define AGENT_COPYDATA_ID 0x804e50ba /* random goop */
25
26 /*
27 * FIXME: maybe some day we can sort this out ...
28 */
29 #define AGENT_MAX_MSGLEN 8192
30
31 #define IDM_CLOSE 0x0010
32 #define IDM_VIEWKEYS 0x0020
33 #define IDM_ADDKEY 0x0030
34 #define IDM_ABOUT 0x0040
35
36 #define APPNAME "Pageant"
37
38 extern char ver[];
39
40 static HINSTANCE instance;
41 static HWND hwnd;
42 static HWND keylist;
43 static HWND aboutbox;
44 static HMENU systray_menu;
45 static int already_running;
46
47 static tree234 *rsakeys, *ssh2keys;
48
49 static int has_security;
50 #ifndef NO_SECURITY
51 typedef DWORD (WINAPI *gsi_fn_t)
52 (HANDLE, SE_OBJECT_TYPE, SECURITY_INFORMATION,
53 PSID *, PSID *, PACL *, PACL *,
54 PSECURITY_DESCRIPTOR *);
55 static gsi_fn_t getsecurityinfo;
56 #endif
57
58 /*
59 * Exports from pageantc.c
60 */
61 void agent_query(void *in, int inlen, void **out, int *outlen);
62 int agent_exists(void);
63
64 /*
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 * and the signing functions, which are deterministic, this should
68 * never be called.
69 *
70 * If it _is_ called, there is a _serious_ problem, because it
71 * won't generate true random numbers. So we must scream, panic,
72 * and exit immediately if that should happen.
73 */
74 int random_byte(void) {
75 MessageBox(hwnd, "Internal Error", APPNAME, MB_OK | MB_ICONERROR);
76 exit(0);
77 }
78
79 /*
80 * Blob structure for passing to the asymmetric SSH2 key compare
81 * function, prototyped here.
82 */
83 struct blob {
84 unsigned char *blob;
85 int len;
86 };
87 static int cmpkeys_ssh2_asymm(void *av, void *bv);
88
89 /*
90 * This function is needed to link with the DES code. We need not
91 * have it do anything at all.
92 */
93 void logevent(char *msg) {
94 }
95
96 #define GET_32BIT(cp) \
97 (((unsigned long)(unsigned char)(cp)[0] << 24) | \
98 ((unsigned long)(unsigned char)(cp)[1] << 16) | \
99 ((unsigned long)(unsigned char)(cp)[2] << 8) | \
100 ((unsigned long)(unsigned char)(cp)[3]))
101
102 #define PUT_32BIT(cp, value) { \
103 (cp)[0] = (unsigned char)((value) >> 24); \
104 (cp)[1] = (unsigned char)((value) >> 16); \
105 (cp)[2] = (unsigned char)((value) >> 8); \
106 (cp)[3] = (unsigned char)(value); }
107
108 #define PASSPHRASE_MAXLEN 512
109
110 struct PassphraseProcStruct {
111 char *passphrase;
112 char *comment;
113 };
114
115 /*
116 * Dialog-box function for the Licence box.
117 */
118 static int CALLBACK LicenceProc (HWND hwnd, UINT msg,
119 WPARAM wParam, LPARAM lParam) {
120 switch (msg) {
121 case WM_INITDIALOG:
122 return 1;
123 case WM_COMMAND:
124 switch (LOWORD(wParam)) {
125 case IDOK:
126 EndDialog(hwnd, 1);
127 return 0;
128 }
129 return 0;
130 case WM_CLOSE:
131 EndDialog(hwnd, 1);
132 return 0;
133 }
134 return 0;
135 }
136
137 /*
138 * Dialog-box function for the About box.
139 */
140 static int CALLBACK AboutProc (HWND hwnd, UINT msg,
141 WPARAM wParam, LPARAM lParam) {
142 switch (msg) {
143 case WM_INITDIALOG:
144 SetDlgItemText (hwnd, 100, ver);
145 return 1;
146 case WM_COMMAND:
147 switch (LOWORD(wParam)) {
148 case IDOK:
149 aboutbox = NULL;
150 DestroyWindow (hwnd);
151 return 0;
152 case 101:
153 EnableWindow(hwnd, 0);
154 DialogBox (instance, MAKEINTRESOURCE(214), NULL, LicenceProc);
155 EnableWindow(hwnd, 1);
156 SetActiveWindow(hwnd);
157 return 0;
158 }
159 return 0;
160 case WM_CLOSE:
161 aboutbox = NULL;
162 DestroyWindow (hwnd);
163 return 0;
164 }
165 return 0;
166 }
167
168 /*
169 * Dialog-box function for the passphrase box.
170 */
171 static int CALLBACK PassphraseProc(HWND hwnd, UINT msg,
172 WPARAM wParam, LPARAM lParam) {
173 static char *passphrase = NULL;
174 struct PassphraseProcStruct *p;
175
176 switch (msg) {
177 case WM_INITDIALOG:
178 /*
179 * Centre the window.
180 */
181 { /* centre the window */
182 RECT rs, rd;
183 HWND hw;
184
185 hw = GetDesktopWindow();
186 if (GetWindowRect (hw, &rs) && GetWindowRect (hwnd, &rd))
187 MoveWindow (hwnd, (rs.right + rs.left + rd.left - rd.right)/2,
188 (rs.bottom + rs.top + rd.top - rd.bottom)/2,
189 rd.right-rd.left, rd.bottom-rd.top, TRUE);
190 }
191
192 SetForegroundWindow(hwnd);
193 SetWindowPos (hwnd, HWND_TOP, 0, 0, 0, 0,
194 SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
195 p = (struct PassphraseProcStruct *)lParam;
196 passphrase = p->passphrase;
197 if (p->comment)
198 SetDlgItemText(hwnd, 101, p->comment);
199 *passphrase = 0;
200 SetDlgItemText (hwnd, 102, passphrase);
201 return 0;
202 case WM_COMMAND:
203 switch (LOWORD(wParam)) {
204 case IDOK:
205 if (*passphrase)
206 EndDialog (hwnd, 1);
207 else
208 MessageBeep (0);
209 return 0;
210 case IDCANCEL:
211 EndDialog (hwnd, 0);
212 return 0;
213 case 102: /* edit box */
214 if ((HIWORD(wParam) == EN_CHANGE) && passphrase) {
215 GetDlgItemText (hwnd, 102, passphrase, PASSPHRASE_MAXLEN-1);
216 passphrase[PASSPHRASE_MAXLEN-1] = '\0';
217 }
218 return 0;
219 }
220 return 0;
221 case WM_CLOSE:
222 EndDialog (hwnd, 0);
223 return 0;
224 }
225 return 0;
226 }
227
228 /*
229 * Update the visible key list.
230 */
231 static void keylist_update(void) {
232 struct RSAKey *rkey;
233 struct ssh2_userkey *skey;
234 int i;
235
236 if (keylist) {
237 SendDlgItemMessage(keylist, 100, LB_RESETCONTENT, 0, 0);
238 for (i = 0; NULL != (rkey = index234(rsakeys, i)); i++) {
239 char listentry[512], *p;
240 /*
241 * Replace two spaces in the fingerprint with tabs, for
242 * nice alignment in the box.
243 */
244 strcpy(listentry, "ssh1\t");
245 p = listentry+strlen(listentry);
246 rsa_fingerprint(p, sizeof(listentry)-(p-listentry), rkey);
247 p = strchr(listentry, ' '); if (p) *p = '\t';
248 p = strchr(listentry, ' '); if (p) *p = '\t';
249 SendDlgItemMessage (keylist, 100, LB_ADDSTRING,
250 0, (LPARAM)listentry);
251 }
252 for (i = 0; NULL != (skey = index234(ssh2keys, i)); i++) {
253 char listentry[512], *p;
254 int len;
255 /*
256 * Replace two spaces in the fingerprint with tabs, for
257 * nice alignment in the box.
258 */
259 p = skey->alg->fingerprint(skey->data);
260 strncpy(listentry, p, sizeof(listentry));
261 p = strchr(listentry, ' '); if (p) *p = '\t';
262 p = strchr(listentry, ' '); if (p) *p = '\t';
263 len = strlen(listentry);
264 if (len < sizeof(listentry)-2) {
265 listentry[len] = '\t';
266 strncpy(listentry+len+1, skey->comment, sizeof(listentry)-len-1);
267 }
268 SendDlgItemMessage (keylist, 100, LB_ADDSTRING,
269 0, (LPARAM)listentry);
270 }
271 SendDlgItemMessage (keylist, 100, LB_SETCURSEL, (WPARAM) -1, 0);
272 }
273 }
274
275 /*
276 * This function loads a key from a file and adds it.
277 */
278 static void add_keyfile(char *filename) {
279 char passphrase[PASSPHRASE_MAXLEN];
280 struct RSAKey *rkey;
281 struct ssh2_userkey *skey;
282 int needs_pass;
283 int ret;
284 int attempts;
285 char *comment;
286 struct PassphraseProcStruct pps;
287 int ver;
288
289 ver = keyfile_version(filename);
290 if (ver == 0) {
291 MessageBox(NULL, "Couldn't load private key.", APPNAME,
292 MB_OK | MB_ICONERROR);
293 return;
294 }
295
296 if (ver == 1)
297 needs_pass = rsakey_encrypted(filename, &comment);
298 else
299 needs_pass = ssh2_userkey_encrypted(filename, &comment);
300 attempts = 0;
301 if (ver == 1)
302 rkey = smalloc(sizeof(*rkey));
303 pps.passphrase = passphrase;
304 pps.comment = comment;
305 do {
306 if (needs_pass) {
307 int dlgret;
308 dlgret = DialogBoxParam(instance, MAKEINTRESOURCE(210),
309 NULL, PassphraseProc,
310 (LPARAM)&pps);
311 if (!dlgret) {
312 if (comment) sfree(comment);
313 if (ver == 1)
314 sfree(rkey);
315 return; /* operation cancelled */
316 }
317 } else
318 *passphrase = '\0';
319 if (ver == 1)
320 ret = loadrsakey(filename, rkey, passphrase);
321 else {
322 skey = ssh2_load_userkey(filename, passphrase);
323 if (skey == SSH2_WRONG_PASSPHRASE)
324 ret = -1;
325 else if (!skey)
326 ret = 0;
327 else
328 ret = 1;
329 }
330 attempts++;
331 } while (ret == -1);
332 if (comment) sfree(comment);
333 if (ret == 0) {
334 MessageBox(NULL, "Couldn't load private key.", APPNAME,
335 MB_OK | MB_ICONERROR);
336 if (ver == 1)
337 sfree(rkey);
338 return;
339 }
340 if (ver == 1) {
341 if (already_running) {
342 unsigned char *request, *response;
343 int reqlen, clen, resplen;
344
345 clen = strlen(rkey->comment);
346
347 reqlen = 4 + 1 + /* length, message type */
348 4 + /* bit count */
349 ssh1_bignum_length(rkey->modulus) +
350 ssh1_bignum_length(rkey->exponent) +
351 ssh1_bignum_length(rkey->private_exponent) +
352 ssh1_bignum_length(rkey->iqmp) +
353 ssh1_bignum_length(rkey->p) +
354 ssh1_bignum_length(rkey->q) +
355 4 + clen /* comment */
356 ;
357
358 request = smalloc(reqlen);
359
360 request[4] = SSH1_AGENTC_ADD_RSA_IDENTITY;
361 reqlen = 5;
362 PUT_32BIT(request+reqlen, bignum_bitcount(rkey->modulus));
363 reqlen += 4;
364 reqlen += ssh1_write_bignum(request+reqlen, rkey->modulus);
365 reqlen += ssh1_write_bignum(request+reqlen, rkey->exponent);
366 reqlen += ssh1_write_bignum(request+reqlen, rkey->private_exponent);
367 reqlen += ssh1_write_bignum(request+reqlen, rkey->iqmp);
368 reqlen += ssh1_write_bignum(request+reqlen, rkey->p);
369 reqlen += ssh1_write_bignum(request+reqlen, rkey->q);
370 PUT_32BIT(request+reqlen, clen);
371 memcpy(request+reqlen+4, rkey->comment, clen);
372 reqlen += 4+clen;
373 PUT_32BIT(request, reqlen-4);
374
375 agent_query(request, reqlen, &response, &resplen);
376 if (resplen < 5 || response[4] != SSH_AGENT_SUCCESS)
377 MessageBox(NULL, "The already running Pageant "
378 "refused to add the key.", APPNAME,
379 MB_OK | MB_ICONERROR);
380 } else {
381 if (add234(rsakeys, rkey) != rkey)
382 sfree(rkey); /* already present, don't waste RAM */
383 }
384 } else {
385 if (already_running) {
386 unsigned char *request, *response;
387 int reqlen, alglen, clen, keybloblen, resplen;
388 alglen = strlen(skey->alg->name);
389 clen = strlen(skey->comment);
390
391 keybloblen = skey->alg->openssh_fmtkey(skey->data, NULL, 0);
392
393 reqlen = 4 + 1 + /* length, message type */
394 4 + alglen + /* algorithm name */
395 keybloblen + /* key data */
396 4 + clen /* comment */
397 ;
398
399 request = smalloc(reqlen);
400
401 request[4] = SSH2_AGENTC_ADD_IDENTITY;
402 reqlen = 5;
403 PUT_32BIT(request+reqlen, alglen);
404 reqlen += 4;
405 memcpy(request+reqlen, skey->alg->name, alglen);
406 reqlen += alglen;
407 reqlen += skey->alg->openssh_fmtkey(skey->data,
408 request+reqlen, keybloblen);
409 PUT_32BIT(request+reqlen, clen);
410 memcpy(request+reqlen+4, skey->comment, clen);
411 PUT_32BIT(request, reqlen-4);
412 reqlen += clen+4;
413
414 agent_query(request, reqlen, &response, &resplen);
415 if (resplen < 5 || response[4] != SSH_AGENT_SUCCESS)
416 MessageBox(NULL, "The already running Pageant"
417 "refused to add the key.", APPNAME,
418 MB_OK | MB_ICONERROR);
419 } else {
420 if (add234(ssh2keys, skey) != skey) {
421 skey->alg->freekey(skey->data);
422 sfree(skey); /* already present, don't waste RAM */
423 }
424 }
425 }
426 }
427
428 /*
429 * This is the main agent function that answers messages.
430 */
431 static void answer_msg(void *msg) {
432 unsigned char *p = msg;
433 unsigned char *ret = msg;
434 int type;
435
436 /*
437 * Get the message type.
438 */
439 type = p[4];
440
441 p += 5;
442 switch (type) {
443 case SSH1_AGENTC_REQUEST_RSA_IDENTITIES:
444 /*
445 * Reply with SSH1_AGENT_RSA_IDENTITIES_ANSWER.
446 */
447 {
448 struct RSAKey *key;
449 int len, nkeys;
450 int i;
451
452 /*
453 * Count up the number and length of keys we hold.
454 */
455 len = nkeys = 0;
456 for (i = 0; NULL != (key = index234(rsakeys, i)); i++) {
457 nkeys++;
458 len += 4; /* length field */
459 len += ssh1_bignum_length(key->exponent);
460 len += ssh1_bignum_length(key->modulus);
461 len += 4 + strlen(key->comment);
462 }
463
464 /*
465 * Packet header is the obvious five bytes, plus four
466 * bytes for the key count.
467 */
468 len += 5 + 4;
469 if (len > AGENT_MAX_MSGLEN)
470 goto failure; /* aaargh! too much stuff! */
471 PUT_32BIT(ret, len-4);
472 ret[4] = SSH1_AGENT_RSA_IDENTITIES_ANSWER;
473 PUT_32BIT(ret+5, nkeys);
474 p = ret + 5 + 4;
475 for (i = 0; NULL != (key = index234(rsakeys, i)); i++) {
476 PUT_32BIT(p, bignum_bitcount(key->modulus));
477 p += 4;
478 p += ssh1_write_bignum(p, key->exponent);
479 p += ssh1_write_bignum(p, key->modulus);
480 PUT_32BIT(p, strlen(key->comment));
481 memcpy(p+4, key->comment, strlen(key->comment));
482 p += 4 + strlen(key->comment);
483 }
484 }
485 break;
486 case SSH2_AGENTC_REQUEST_IDENTITIES:
487 /*
488 * Reply with SSH2_AGENT_IDENTITIES_ANSWER.
489 */
490 {
491 struct ssh2_userkey *key;
492 int len, nkeys;
493 unsigned char *blob;
494 int bloblen;
495 int i;
496
497 /*
498 * Count up the number and length of keys we hold.
499 */
500 len = nkeys = 0;
501 for (i = 0; NULL != (key = index234(ssh2keys, i)); i++) {
502 nkeys++;
503 len += 4; /* length field */
504 blob = key->alg->public_blob(key->data, &bloblen);
505 len += bloblen;
506 sfree(blob);
507 len += 4 + strlen(key->comment);
508 }
509
510 /*
511 * Packet header is the obvious five bytes, plus four
512 * bytes for the key count.
513 */
514 len += 5 + 4;
515 if (len > AGENT_MAX_MSGLEN)
516 goto failure; /* aaargh! too much stuff! */
517 PUT_32BIT(ret, len-4);
518 ret[4] = SSH2_AGENT_IDENTITIES_ANSWER;
519 PUT_32BIT(ret+5, nkeys);
520 p = ret + 5 + 4;
521 for (i = 0; NULL != (key = index234(ssh2keys, i)); i++) {
522 blob = key->alg->public_blob(key->data, &bloblen);
523 PUT_32BIT(p, bloblen);
524 p += 4;
525 memcpy(p, blob, bloblen);
526 p += bloblen;
527 sfree(blob);
528 PUT_32BIT(p, strlen(key->comment));
529 memcpy(p+4, key->comment, strlen(key->comment));
530 p += 4 + strlen(key->comment);
531 }
532 }
533 break;
534 case SSH1_AGENTC_RSA_CHALLENGE:
535 /*
536 * Reply with either SSH1_AGENT_RSA_RESPONSE or
537 * SSH_AGENT_FAILURE, depending on whether we have that key
538 * or not.
539 */
540 {
541 struct RSAKey reqkey, *key;
542 Bignum challenge, response;
543 unsigned char response_source[48], response_md5[16];
544 struct MD5Context md5c;
545 int i, len;
546
547 p += 4;
548 p += ssh1_read_bignum(p, &reqkey.exponent);
549 p += ssh1_read_bignum(p, &reqkey.modulus);
550 p += ssh1_read_bignum(p, &challenge);
551 memcpy(response_source+32, p, 16); p += 16;
552 if (GET_32BIT(p) != 1 ||
553 (key = find234(rsakeys, &reqkey, NULL)) == NULL) {
554 freebn(reqkey.exponent);
555 freebn(reqkey.modulus);
556 freebn(challenge);
557 goto failure;
558 }
559 response = rsadecrypt(challenge, key);
560 for (i = 0; i < 32; i++)
561 response_source[i] = bignum_byte(response, 31-i);
562
563 MD5Init(&md5c);
564 MD5Update(&md5c, response_source, 48);
565 MD5Final(response_md5, &md5c);
566 memset(response_source, 0, 48); /* burn the evidence */
567 freebn(response); /* and that evidence */
568 freebn(challenge); /* yes, and that evidence */
569 freebn(reqkey.exponent); /* and free some memory ... */
570 freebn(reqkey.modulus); /* ... while we're at it. */
571
572 /*
573 * Packet is the obvious five byte header, plus sixteen
574 * bytes of MD5.
575 */
576 len = 5 + 16;
577 PUT_32BIT(ret, len-4);
578 ret[4] = SSH1_AGENT_RSA_RESPONSE;
579 memcpy(ret+5, response_md5, 16);
580 }
581 break;
582 case SSH2_AGENTC_SIGN_REQUEST:
583 /*
584 * Reply with either SSH2_AGENT_RSA_RESPONSE or
585 * SSH_AGENT_FAILURE, depending on whether we have that key
586 * or not.
587 */
588 {
589 struct ssh2_userkey *key;
590 struct blob b;
591 unsigned char *data, *signature;
592 int datalen, siglen, len;
593
594 b.len = GET_32BIT(p);
595 p += 4;
596 b.blob = p;
597 p += b.len;
598 datalen = GET_32BIT(p);
599 p += 4;
600 data = p;
601 key = find234(ssh2keys, &b, cmpkeys_ssh2_asymm);
602 if (!key)
603 goto failure;
604 signature = key->alg->sign(key->data, data, datalen, &siglen);
605 len = 5+4+siglen;
606 PUT_32BIT(ret, len-4);
607 ret[4] = SSH2_AGENT_SIGN_RESPONSE;
608 PUT_32BIT(ret+5, siglen);
609 memcpy(ret+5+4, signature, siglen);
610 sfree(signature);
611 }
612 break;
613 case SSH1_AGENTC_ADD_RSA_IDENTITY:
614 /*
615 * Add to the list and return SSH_AGENT_SUCCESS, or
616 * SSH_AGENT_FAILURE if the key was malformed.
617 */
618 {
619 struct RSAKey *key;
620 char *comment;
621 key = smalloc(sizeof(struct RSAKey));
622 memset(key, 0, sizeof(key));
623 p += makekey(p, key, NULL, 1);
624 p += makeprivate(p, key);
625 p += ssh1_read_bignum(p, key->iqmp); /* p^-1 mod q */
626 p += ssh1_read_bignum(p, key->p); /* p */
627 p += ssh1_read_bignum(p, key->q); /* q */
628 comment = smalloc(GET_32BIT(p));
629 if (comment) {
630 memcpy(comment, p+4, GET_32BIT(p));
631 key->comment = comment;
632 }
633 PUT_32BIT(ret, 1);
634 ret[4] = SSH_AGENT_FAILURE;
635 if (add234(rsakeys, key) == key) {
636 keylist_update();
637 ret[4] = SSH_AGENT_SUCCESS;
638 } else {
639 freersakey(key);
640 sfree(key);
641 }
642 }
643 break;
644 case SSH2_AGENTC_ADD_IDENTITY:
645 /*
646 * Add to the list and return SSH_AGENT_SUCCESS, or
647 * SSH_AGENT_FAILURE if the key was malformed.
648 */
649 {
650 struct ssh2_userkey *key;
651 char *comment, *alg;
652 int alglen, commlen;
653 int bloblen;
654
655 key = smalloc(sizeof(struct ssh2_userkey));
656
657 alglen = GET_32BIT(p); p += 4;
658 alg = p; p += alglen;
659 /* Add further algorithm names here. */
660 if (alglen == 7 && !memcmp(alg, "ssh-rsa", 7))
661 key->alg = &ssh_rsa;
662 else {
663 sfree(key);
664 goto failure;
665 }
666
667 bloblen = GET_32BIT((unsigned char *)msg) - (p-(unsigned char *)msg-4);
668 key->data = key->alg->openssh_createkey(&p, &bloblen);
669 if (!key->data) {
670 sfree(key);
671 goto failure;
672 }
673 commlen = GET_32BIT(p); p += 4;
674
675 comment = smalloc(commlen+1);
676 if (comment) {
677 memcpy(comment, p, commlen);
678 comment[commlen] = '\0';
679 }
680 key->comment = comment;
681
682 PUT_32BIT(ret, 1);
683 ret[4] = SSH_AGENT_FAILURE;
684 if (add234(ssh2keys, key) == key) {
685 keylist_update();
686 ret[4] = SSH_AGENT_SUCCESS;
687 } else {
688 key->alg->freekey(key->data);
689 sfree(key->comment);
690 sfree(key);
691 }
692 }
693 break;
694 case SSH1_AGENTC_REMOVE_RSA_IDENTITY:
695 /*
696 * Remove from the list and return SSH_AGENT_SUCCESS, or
697 * perhaps SSH_AGENT_FAILURE if it wasn't in the list to
698 * start with.
699 */
700 {
701 struct RSAKey reqkey, *key;
702
703 p += makekey(p, &reqkey, NULL, 0);
704 key = find234(rsakeys, &reqkey, NULL);
705 freebn(reqkey.exponent);
706 freebn(reqkey.modulus);
707 PUT_32BIT(ret, 1);
708 ret[4] = SSH_AGENT_FAILURE;
709 if (key) {
710 del234(rsakeys, key);
711 keylist_update();
712 freersakey(key);
713 sfree(key);
714 ret[4] = SSH_AGENT_SUCCESS;
715 }
716 }
717 break;
718 case SSH2_AGENTC_REMOVE_IDENTITY:
719 /*
720 * Remove from the list and return SSH_AGENT_SUCCESS, or
721 * perhaps SSH_AGENT_FAILURE if it wasn't in the list to
722 * start with.
723 */
724 {
725 struct ssh2_userkey *key;
726 struct blob b;
727
728 b.len = GET_32BIT(p);
729 p += 4;
730 b.blob = p;
731 p += b.len;
732 key = find234(ssh2keys, &b, cmpkeys_ssh2_asymm);
733 if (!key)
734 goto failure;
735
736 PUT_32BIT(ret, 1);
737 ret[4] = SSH_AGENT_FAILURE;
738 if (key) {
739 del234(ssh2keys, key);
740 keylist_update();
741 key->alg->freekey(key->data);
742 sfree(key);
743 ret[4] = SSH_AGENT_SUCCESS;
744 }
745 }
746 break;
747 case SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
748 /*
749 * Remove all SSH1 keys. Always returns success.
750 */
751 {
752 struct RSAKey *rkey;
753
754 while ( (rkey = index234(rsakeys, 0)) != NULL ) {
755 del234(rsakeys, rkey);
756 freersakey(rkey);
757 sfree(rkey);
758 }
759 keylist_update();
760
761 PUT_32BIT(ret, 1);
762 ret[4] = SSH_AGENT_SUCCESS;
763 }
764 break;
765 case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
766 /*
767 * Remove all SSH2 keys. Always returns success.
768 */
769 {
770 struct ssh2_userkey *skey;
771
772 while ( (skey = index234(ssh2keys, 0)) != NULL ) {
773 del234(ssh2keys, skey);
774 skey->alg->freekey(skey->data);
775 sfree(skey);
776 }
777 keylist_update();
778
779 PUT_32BIT(ret, 1);
780 ret[4] = SSH_AGENT_SUCCESS;
781 }
782 break;
783 default:
784 failure:
785 /*
786 * Unrecognised message. Return SSH_AGENT_FAILURE.
787 */
788 PUT_32BIT(ret, 1);
789 ret[4] = SSH_AGENT_FAILURE;
790 break;
791 }
792 }
793
794 /*
795 * Key comparison function for the 2-3-4 tree of RSA keys.
796 */
797 static int cmpkeys_rsa(void *av, void *bv) {
798 struct RSAKey *a = (struct RSAKey *)av;
799 struct RSAKey *b = (struct RSAKey *)bv;
800 Bignum am, bm;
801 int alen, blen;
802
803 am = a->modulus;
804 bm = b->modulus;
805 /*
806 * Compare by length of moduli.
807 */
808 alen = bignum_bitcount(am);
809 blen = bignum_bitcount(bm);
810 if (alen > blen) return +1; else if (alen < blen) return -1;
811 /*
812 * Now compare by moduli themselves.
813 */
814 alen = (alen + 7) / 8; /* byte count */
815 while (alen-- > 0) {
816 int abyte, bbyte;
817 abyte = bignum_byte(am, alen);
818 bbyte = bignum_byte(bm, alen);
819 if (abyte > bbyte) return +1; else if (abyte < bbyte) return -1;
820 }
821 /*
822 * Give up.
823 */
824 return 0;
825 }
826
827 /*
828 * Key comparison function for the 2-3-4 tree of SSH2 keys.
829 */
830 static int cmpkeys_ssh2(void *av, void *bv) {
831 struct ssh2_userkey *a = (struct ssh2_userkey *)av;
832 struct ssh2_userkey *b = (struct ssh2_userkey *)bv;
833 int i;
834 int alen, blen;
835 unsigned char *ablob, *bblob;
836 int c;
837
838 /*
839 * Compare purely by public blob.
840 */
841 ablob = a->alg->public_blob(a->data, &alen);
842 bblob = b->alg->public_blob(b->data, &blen);
843
844 c = 0;
845 for (i = 0; i < alen && i < blen; i++) {
846 if (ablob[i] < bblob[i]) {
847 c = -1; break;
848 } else if (ablob[i] > bblob[i]) {
849 c = +1; break;
850 }
851 }
852 if (c == 0 && i < alen) c = +1; /* a is longer */
853 if (c == 0 && i < blen) c = -1; /* a is longer */
854
855 sfree(ablob);
856 sfree(bblob);
857
858 return c;
859 }
860
861 /*
862 * Key comparison function for looking up a blob in the 2-3-4 tree
863 * of SSH2 keys.
864 */
865 static int cmpkeys_ssh2_asymm(void *av, void *bv) {
866 struct blob *a = (struct blob *)av;
867 struct ssh2_userkey *b = (struct ssh2_userkey *)bv;
868 int i;
869 int alen, blen;
870 unsigned char *ablob, *bblob;
871 int c;
872
873 /*
874 * Compare purely by public blob.
875 */
876 ablob = a->blob;
877 alen = a->len;
878 bblob = b->alg->public_blob(b->data, &blen);
879
880 c = 0;
881 for (i = 0; i < alen && i < blen; i++) {
882 if (ablob[i] < bblob[i]) {
883 c = -1; break;
884 } else if (ablob[i] > bblob[i]) {
885 c = +1; break;
886 }
887 }
888 if (c == 0 && i < alen) c = +1; /* a is longer */
889 if (c == 0 && i < blen) c = -1; /* a is longer */
890
891 sfree(bblob);
892
893 return c;
894 }
895
896 static void error(char *s) {
897 MessageBox(hwnd, s, APPNAME, MB_OK | MB_ICONERROR);
898 }
899
900 /*
901 * Prompt for a key file to add, and add it.
902 */
903 static void prompt_add_keyfile(void) {
904 OPENFILENAME of;
905 char filename[FILENAME_MAX];
906 memset(&of, 0, sizeof(of));
907 #ifdef OPENFILENAME_SIZE_VERSION_400
908 of.lStructSize = OPENFILENAME_SIZE_VERSION_400;
909 #else
910 of.lStructSize = sizeof(of);
911 #endif
912 of.hwndOwner = hwnd;
913 of.lpstrFilter = "All Files\0*\0\0\0";
914 of.lpstrCustomFilter = NULL;
915 of.nFilterIndex = 1;
916 of.lpstrFile = filename; *filename = '\0';
917 of.nMaxFile = sizeof(filename);
918 of.lpstrFileTitle = NULL;
919 of.lpstrInitialDir = NULL;
920 of.lpstrTitle = "Select Private Key File";
921 of.Flags = 0;
922 if (GetOpenFileName(&of)) {
923 add_keyfile(filename);
924 keylist_update();
925 }
926 }
927
928 /*
929 * Dialog-box function for the key list box.
930 */
931 static int CALLBACK KeyListProc(HWND hwnd, UINT msg,
932 WPARAM wParam, LPARAM lParam) {
933 struct RSAKey *rkey;
934 struct ssh2_userkey *skey;
935
936 switch (msg) {
937 case WM_INITDIALOG:
938 /*
939 * Centre the window.
940 */
941 { /* centre the window */
942 RECT rs, rd;
943 HWND hw;
944
945 hw = GetDesktopWindow();
946 if (GetWindowRect (hw, &rs) && GetWindowRect (hwnd, &rd))
947 MoveWindow (hwnd, (rs.right + rs.left + rd.left - rd.right)/2,
948 (rs.bottom + rs.top + rd.top - rd.bottom)/2,
949 rd.right-rd.left, rd.bottom-rd.top, TRUE);
950 }
951
952 keylist = hwnd;
953 {
954 static int tabs[] = {35, 60, 210};
955 SendDlgItemMessage (hwnd, 100, LB_SETTABSTOPS,
956 sizeof(tabs)/sizeof(*tabs), (LPARAM) tabs);
957 }
958 keylist_update();
959 return 0;
960 case WM_COMMAND:
961 switch (LOWORD(wParam)) {
962 case IDOK:
963 case IDCANCEL:
964 keylist = NULL;
965 DestroyWindow(hwnd);
966 return 0;
967 case 101: /* add key */
968 if (HIWORD(wParam) == BN_CLICKED ||
969 HIWORD(wParam) == BN_DOUBLECLICKED) {
970 prompt_add_keyfile();
971 }
972 return 0;
973 case 102: /* remove key */
974 if (HIWORD(wParam) == BN_CLICKED ||
975 HIWORD(wParam) == BN_DOUBLECLICKED) {
976 int n = SendDlgItemMessage (hwnd, 100, LB_GETCURSEL, 0, 0);
977 int i;
978 if (n == LB_ERR) {
979 MessageBeep(0);
980 break;
981 }
982 for (i = 0; NULL != (rkey = index234(rsakeys, i)); i++)
983 if (n-- == 0)
984 break;
985 if (rkey) {
986 del234(rsakeys, rkey);
987 freersakey(rkey);
988 sfree(rkey);
989 } else {
990 for (i = 0; NULL != (skey = index234(ssh2keys, i)); i++)
991 if (n-- == 0)
992 break;
993 if (skey) {
994 del234(ssh2keys, skey);
995 skey->alg->freekey(skey->data);
996 sfree(skey);
997 }
998 }
999 keylist_update();
1000 }
1001 return 0;
1002 }
1003 return 0;
1004 case WM_CLOSE:
1005 keylist = NULL;
1006 DestroyWindow(hwnd);
1007 return 0;
1008 }
1009 return 0;
1010 }
1011
1012 static LRESULT CALLBACK WndProc (HWND hwnd, UINT message,
1013 WPARAM wParam, LPARAM lParam) {
1014 int ret;
1015 static int menuinprogress;
1016
1017 switch (message) {
1018 case WM_SYSTRAY:
1019 if (lParam == WM_RBUTTONUP) {
1020 POINT cursorpos;
1021 GetCursorPos(&cursorpos);
1022 PostMessage(hwnd, WM_SYSTRAY2, cursorpos.x, cursorpos.y);
1023 } else if (lParam == WM_LBUTTONDBLCLK) {
1024 /* Equivalent to IDM_VIEWKEYS. */
1025 PostMessage(hwnd, WM_COMMAND, IDM_VIEWKEYS, 0);
1026 }
1027 break;
1028 case WM_SYSTRAY2:
1029 if (!menuinprogress) {
1030 menuinprogress = 1;
1031 SetForegroundWindow(hwnd);
1032 ret = TrackPopupMenu(systray_menu,
1033 TPM_RIGHTALIGN | TPM_BOTTOMALIGN |
1034 TPM_RIGHTBUTTON,
1035 wParam, lParam, 0, hwnd, NULL);
1036 menuinprogress = 0;
1037 }
1038 break;
1039 case WM_COMMAND:
1040 case WM_SYSCOMMAND:
1041 switch (wParam & ~0xF) { /* low 4 bits reserved to Windows */
1042 case IDM_CLOSE:
1043 SendMessage(hwnd, WM_CLOSE, 0, 0);
1044 break;
1045 case IDM_VIEWKEYS:
1046 if (!keylist) {
1047 keylist = CreateDialog (instance, MAKEINTRESOURCE(211),
1048 NULL, KeyListProc);
1049 ShowWindow (keylist, SW_SHOWNORMAL);
1050 /*
1051 * Sometimes the window comes up minimised / hidden
1052 * for no obvious reason. Prevent this.
1053 */
1054 SetForegroundWindow(keylist);
1055 SetWindowPos (keylist, HWND_TOP, 0, 0, 0, 0,
1056 SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
1057 }
1058 break;
1059 case IDM_ADDKEY:
1060 prompt_add_keyfile();
1061 break;
1062 case IDM_ABOUT:
1063 if (!aboutbox) {
1064 aboutbox = CreateDialog (instance, MAKEINTRESOURCE(213),
1065 NULL, AboutProc);
1066 ShowWindow (aboutbox, SW_SHOWNORMAL);
1067 /*
1068 * Sometimes the window comes up minimised / hidden
1069 * for no obvious reason. Prevent this.
1070 */
1071 SetForegroundWindow(aboutbox);
1072 SetWindowPos (aboutbox, HWND_TOP, 0, 0, 0, 0,
1073 SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
1074 }
1075 break;
1076 }
1077 break;
1078 case WM_DESTROY:
1079 PostQuitMessage (0);
1080 return 0;
1081 case WM_COPYDATA:
1082 {
1083 COPYDATASTRUCT *cds;
1084 char *mapname;
1085 void *p;
1086 HANDLE filemap, proc;
1087 PSID mapowner, procowner;
1088 PSECURITY_DESCRIPTOR psd1 = NULL, psd2 = NULL;
1089 int ret = 0;
1090
1091 cds = (COPYDATASTRUCT *)lParam;
1092 if (cds->dwData != AGENT_COPYDATA_ID)
1093 return 0; /* not our message, mate */
1094 mapname = (char *)cds->lpData;
1095 if (mapname[cds->cbData - 1] != '\0')
1096 return 0; /* failure to be ASCIZ! */
1097 #ifdef DEBUG_IPC
1098 debug(("mapname is :%s:\n", mapname));
1099 #endif
1100 filemap = OpenFileMapping(FILE_MAP_ALL_ACCESS, FALSE, mapname);
1101 #ifdef DEBUG_IPC
1102 debug(("filemap is %p\n", filemap));
1103 #endif
1104 if (filemap != NULL && filemap != INVALID_HANDLE_VALUE) {
1105 int rc;
1106 #ifndef NO_SECURITY
1107 if (has_security) {
1108 if ((proc = OpenProcess(MAXIMUM_ALLOWED, FALSE,
1109 GetCurrentProcessId())) == NULL) {
1110 #ifdef DEBUG_IPC
1111 debug(("couldn't get handle for process\n"));
1112 #endif
1113 return 0;
1114 }
1115 if (getsecurityinfo(proc, SE_KERNEL_OBJECT,
1116 OWNER_SECURITY_INFORMATION,
1117 &procowner, NULL, NULL, NULL,
1118 &psd2) != ERROR_SUCCESS) {
1119 #ifdef DEBUG_IPC
1120 debug(("couldn't get owner info for process\n"));
1121 #endif
1122 CloseHandle(proc);
1123 return 0; /* unable to get security info */
1124 }
1125 CloseHandle(proc);
1126 if ((rc = getsecurityinfo(filemap, SE_KERNEL_OBJECT,
1127 OWNER_SECURITY_INFORMATION,
1128 &mapowner, NULL, NULL, NULL,
1129 &psd1) != ERROR_SUCCESS)) {
1130 #ifdef DEBUG_IPC
1131 debug(("couldn't get owner info for filemap: %d\n", rc));
1132 #endif
1133 return 0;
1134 }
1135 #ifdef DEBUG_IPC
1136 debug(("got security stuff\n"));
1137 #endif
1138 if (!EqualSid(mapowner, procowner))
1139 return 0; /* security ID mismatch! */
1140 #ifdef DEBUG_IPC
1141 debug(("security stuff matched\n"));
1142 #endif
1143 LocalFree(psd1);
1144 LocalFree(psd2);
1145 } else {
1146 #ifdef DEBUG_IPC
1147 debug(("security APIs not present\n"));
1148 #endif
1149 }
1150 #endif
1151 p = MapViewOfFile(filemap, FILE_MAP_WRITE, 0, 0, 0);
1152 #ifdef DEBUG_IPC
1153 debug(("p is %p\n", p));
1154 {int i; for(i=0;i<5;i++)debug(("p[%d]=%02x\n", i, ((unsigned char *)p)[i]));}
1155 #endif
1156 answer_msg(p);
1157 ret = 1;
1158 UnmapViewOfFile(p);
1159 }
1160 CloseHandle(filemap);
1161 return ret;
1162 }
1163 }
1164
1165 return DefWindowProc (hwnd, message, wParam, lParam);
1166 }
1167
1168 /*
1169 * Fork and Exec the command in cmdline. [DBW]
1170 */
1171 void spawn_cmd(char *cmdline, int show) {
1172 if (ShellExecute(NULL, _T("open"), cmdline,
1173 NULL, NULL, show) <= (HINSTANCE) 32) {
1174 TCHAR sMsg[140];
1175 sprintf(sMsg, _T("Failed to run \"%.100s\", Error: %d"), cmdline,
1176 GetLastError());
1177 MessageBox(NULL, sMsg, APPNAME, MB_OK | MB_ICONEXCLAMATION);
1178 }
1179 }
1180
1181 int WINAPI WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmdline, int show) {
1182 WNDCLASS wndclass;
1183 MSG msg;
1184 OSVERSIONINFO osi;
1185 HMODULE advapi;
1186 char *command = NULL;
1187 int added_keys = 0;
1188
1189 /*
1190 * Determine whether we're an NT system (should have security
1191 * APIs) or a non-NT system (don't do security).
1192 */
1193 memset(&osi, 0, sizeof(OSVERSIONINFO));
1194 osi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
1195 if (GetVersionEx(&osi) && osi.dwPlatformId==VER_PLATFORM_WIN32_NT) {
1196 has_security = TRUE;
1197 } else
1198 has_security = FALSE;
1199
1200 if (has_security) {
1201 #ifndef NO_SECURITY
1202 /*
1203 * Attempt to get the security API we need.
1204 */
1205 advapi = LoadLibrary("ADVAPI32.DLL");
1206 getsecurityinfo = (gsi_fn_t)GetProcAddress(advapi, "GetSecurityInfo");
1207 if (!getsecurityinfo) {
1208 MessageBox(NULL,
1209 "Unable to access security APIs. Pageant will\n"
1210 "not run, in case it causes a security breach.",
1211 "Pageant Fatal Error", MB_ICONERROR | MB_OK);
1212 return 1;
1213 }
1214 #else
1215 MessageBox(NULL,
1216 "This program has been compiled for Win9X and will\n"
1217 "not run on NT, in case it causes a security breach.",
1218 "Pageant Fatal Error", MB_ICONERROR | MB_OK);
1219 return 1;
1220 #endif
1221 } else
1222 advapi = NULL;
1223
1224 instance = inst;
1225
1226 /*
1227 * Find out if Pageant is already running.
1228 */
1229 already_running = FALSE;
1230 if (agent_exists())
1231 already_running = TRUE;
1232 else {
1233
1234 if (!prev) {
1235 wndclass.style = 0;
1236 wndclass.lpfnWndProc = WndProc;
1237 wndclass.cbClsExtra = 0;
1238 wndclass.cbWndExtra = 0;
1239 wndclass.hInstance = inst;
1240 wndclass.hIcon = LoadIcon (inst,
1241 MAKEINTRESOURCE(IDI_MAINICON));
1242 wndclass.hCursor = LoadCursor (NULL, IDC_IBEAM);
1243 wndclass.hbrBackground = GetStockObject (BLACK_BRUSH);
1244 wndclass.lpszMenuName = NULL;
1245 wndclass.lpszClassName = APPNAME;
1246
1247 RegisterClass (&wndclass);
1248 }
1249
1250 hwnd = keylist = NULL;
1251
1252 hwnd = CreateWindow (APPNAME, APPNAME,
1253 WS_OVERLAPPEDWINDOW | WS_VSCROLL,
1254 CW_USEDEFAULT, CW_USEDEFAULT,
1255 100, 100, NULL, NULL, inst, NULL);
1256
1257 /* Set up a system tray icon */
1258 {
1259 BOOL res;
1260 NOTIFYICONDATA tnid;
1261 HICON hicon;
1262
1263 #ifdef NIM_SETVERSION
1264 tnid.uVersion = 0;
1265 res = Shell_NotifyIcon(NIM_SETVERSION, &tnid);
1266 #endif
1267
1268 tnid.cbSize = sizeof(NOTIFYICONDATA);
1269 tnid.hWnd = hwnd;
1270 tnid.uID = 1; /* unique within this systray use */
1271 tnid.uFlags = NIF_MESSAGE | NIF_ICON | NIF_TIP;
1272 tnid.uCallbackMessage = WM_SYSTRAY;
1273 tnid.hIcon = hicon = LoadIcon (instance, MAKEINTRESOURCE(201));
1274 strcpy(tnid.szTip, "Pageant (PuTTY authentication agent)");
1275
1276 res = Shell_NotifyIcon(NIM_ADD, &tnid);
1277
1278 if (hicon)
1279 DestroyIcon(hicon);
1280
1281 systray_menu = CreatePopupMenu();
1282 /* accelerators used: vkxa */
1283 AppendMenu (systray_menu, MF_ENABLED, IDM_VIEWKEYS, "&View Keys");
1284 AppendMenu (systray_menu, MF_ENABLED, IDM_ADDKEY, "Add &Key");
1285 AppendMenu (systray_menu, MF_ENABLED, IDM_ABOUT, "&About");
1286 AppendMenu (systray_menu, MF_ENABLED, IDM_CLOSE, "E&xit");
1287 }
1288
1289 ShowWindow (hwnd, SW_HIDE);
1290
1291 /*
1292 * Initialise storage for RSA keys.
1293 */
1294 rsakeys = newtree234(cmpkeys_rsa);
1295 ssh2keys = newtree234(cmpkeys_ssh2);
1296
1297 }
1298
1299 /*
1300 * Process the command line and add keys as listed on it.
1301 * If we already determined that we need to spawn a program from above we
1302 * need to ignore the first two arguments. [DBW]
1303 */
1304 {
1305 char *p;
1306 int inquotes = 0;
1307 int ignorearg = 0;
1308 p = cmdline;
1309 while (*p) {
1310 while (*p && isspace(*p)) p++;
1311 if (*p && !isspace(*p)) {
1312 char *q = p, *pp = p;
1313 while (*p && (inquotes || !isspace(*p)))
1314 {
1315 if (*p == '"') {
1316 inquotes = !inquotes;
1317 p++;
1318 continue;
1319 }
1320 *pp++ = *p++;
1321 }
1322 if (*pp) {
1323 if (*p) p++;
1324 *pp++ = '\0';
1325 }
1326 if (!strcmp(q, "-c")) {
1327 /*
1328 * If we see `-c', then the rest of the
1329 * command line should be treated as a
1330 * command to be spawned.
1331 */
1332 while (*p && isspace(*p)) p++;
1333 command = p;
1334 break;
1335 } else {
1336 add_keyfile(q);
1337 added_keys = TRUE;
1338 }
1339 }
1340 }
1341 }
1342
1343 if (command) spawn_cmd (command, show);
1344
1345 /*
1346 * If Pageant was already running, we leave now. If we haven't
1347 * even taken any auxiliary action (spawned a command or added
1348 * keys), complain.
1349 */
1350 if (already_running) {
1351 if (!command && !added_keys) {
1352 MessageBox(NULL, "Pageant is already running", "Pageant Error",
1353 MB_ICONERROR | MB_OK);
1354 }
1355 if (advapi) FreeLibrary(advapi);
1356 return 0;
1357 }
1358
1359 /*
1360 * Main message loop.
1361 */
1362 while (GetMessage(&msg, NULL, 0, 0) == 1) {
1363 TranslateMessage(&msg);
1364 DispatchMessage(&msg);
1365 }
1366
1367 /* Clean up the system tray icon */
1368 {
1369 NOTIFYICONDATA tnid;
1370
1371 tnid.cbSize = sizeof(NOTIFYICONDATA);
1372 tnid.hWnd = hwnd;
1373 tnid.uID = 1;
1374
1375 Shell_NotifyIcon(NIM_DELETE, &tnid);
1376
1377 DestroyMenu(systray_menu);
1378 }
1379
1380 if (advapi) FreeLibrary(advapi);
1381 exit(msg.wParam);
1382 }
Local modifications for Simon Tatham's `PuTTY' SSH client and terminal emulator