~moody/drawterm

drawterm/secstore.c -rw-r--r-- 15.4 KiB
bf96ad4c — Jacob Moody gui-wl: dont bind more then one seat 2 months ago
                                                                                
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
/*
 * Various files from /sys/src/cmd/auth/secstore, just enough
 * to download a file at boot time.
 */

#include <u.h>
#include <libc.h>
#include <mp.h>
#include <libsec.h>
#include <authsrv.h>
#include "drawterm.h"

static void*
emalloc(ulong n)
{
	return mallocz(n, 1);
}

enum{ CHK = 16};
enum{ MAXFILESIZE = 10*1024*1024 };

enum{// PW status bits
	Enabled 	= (1<<0),
	STA 		= (1<<1),	// extra SecurID step
};

static char testmess[] = "__secstore\tPAK\nC=%s\nm=0\n";

int
secdial(char *secstore)
{
	char *p, buf[80], *f[3];
	int fd, nf;

	p = secstore; /* take it from writehostowner, if set there */
	if(*p == 0)	  /* else use the authserver */
		p = "$auth";

	/* translate $auth ourselves.
	 * authaddr is something like il!host!566 or tcp!host!567.
	 * extract host, accounting for a change of format to something
	 * like il!host or tcp!host or host.
	 */
	if(strcmp(p, "$auth")==0){
		if(authserver == nil)
			return -1;
		strecpy(buf, buf+sizeof buf, authserver);
		nf = getfields(buf, f, nelem(f), 0, "!");
		switch(nf){
		default:
			return -1;
		case 1:
			p = f[0];
			break;
		case 2:
		case 3:
			p = f[1];
			break;
		}
	}
	fd = dial(netmkaddr(p, "tcp", "secstore"), 0, 0, 0);
	if(fd >= 0)
		return fd;
	return -1;
}

int
havesecstore(char *addr, char *owner)
{
	int m, n, fd;
	uchar buf[500];

	n = snprint((char*)buf, sizeof buf, testmess, owner);
	hnputs(buf, 0x8000+n-2);

	fd = secdial(addr);
	if(fd < 0)
		return 0;
	if(write(fd, buf, n) != n || readn(fd, buf, 2) != 2){
		close(fd);
		return 0;
	}
	n = ((buf[0]&0x7f)<<8) + buf[1];
	if(n+1 > sizeof buf){
		werrstr("implausibly large count %d", n);
		close(fd);
		return 0;
	}
	m = readn(fd, buf, n);
	close(fd);
	if(m != n){
		if(m >= 0)
			werrstr("short read from secstore");
		return 0;
	}
	buf[n] = 0;
	if(strcmp((char*)buf, "!account expired") == 0){
		werrstr("account expired");
		return 0;
	}
	return strcmp((char*)buf, "!account exists") == 0;
}

// delimited, authenticated, encrypted connection
enum{ Maxmsg=4096 };	// messages > Maxmsg bytes are truncated
typedef struct SConn SConn;

extern SConn* newSConn(int);	// arg is open file descriptor
struct SConn{
	void *chan;
	int secretlen;
	int (*secret)(SConn*, uchar*, int);// 
	int (*read)(SConn*, uchar*, int); // <0 if error;  errmess in buffer
	int (*write)(SConn*, uchar*, int);
	void (*free)(SConn*);		// also closes file descriptor
};
// secret(s,b,dir) sets secret for digest, encrypt, using the secretlen
//		bytes in b to form keys 	for the two directions;
//	  set dir=0 in client, dir=1 in server

// error convention: write !message in-band
#define readstr secstore_readstr
static void writerr(SConn*, char*);
static int readstr(SConn*, char*);  // call with buf of size Maxmsg+1
	// returns -1 upon error, with error message in buf

typedef struct ConnState {
	uchar secret[SHA1dlen];
	ulong seqno;
	RC4state rc4;
} ConnState;

typedef struct SS{
	int fd;		// file descriptor for read/write of encrypted data
	int alg;	// if nonzero, "alg sha rc4_128"
	ConnState in, out;
} SS;

static int
SC_secret(SConn *conn, uchar *sigma, int direction)
{
	SS *ss = (SS*)(conn->chan);
	int nsigma = conn->secretlen;

	if(direction != 0){
		hmac_sha1(sigma, nsigma, (uchar*)"one", 3, ss->out.secret, nil);
		hmac_sha1(sigma, nsigma, (uchar*)"two", 3, ss->in.secret, nil);
	}else{
		hmac_sha1(sigma, nsigma, (uchar*)"two", 3, ss->out.secret, nil);
		hmac_sha1(sigma, nsigma, (uchar*)"one", 3, ss->in.secret, nil);
	}
	setupRC4state(&ss->in.rc4, ss->in.secret, 16); // restrict to 128 bits
	setupRC4state(&ss->out.rc4, ss->out.secret, 16);
	ss->alg = 1;
	return 0;
}

static void
hash(uchar secret[SHA1dlen], uchar *data, int len, int seqno, uchar d[SHA1dlen])
{
	DigestState sha;
	uchar seq[4];

	seq[0] = seqno>>24;
	seq[1] = seqno>>16;
	seq[2] = seqno>>8;
	seq[3] = seqno;
	memset(&sha, 0, sizeof sha);
	sha1(secret, SHA1dlen, nil, &sha);
	sha1(data, len, nil, &sha);
	sha1(seq, 4, d, &sha);
}

static int
verify(uchar secret[SHA1dlen], uchar *data, int len, int seqno, uchar d[SHA1dlen])
{
	DigestState sha;
	uchar seq[4];
	uchar digest[SHA1dlen];

	seq[0] = seqno>>24;
	seq[1] = seqno>>16;
	seq[2] = seqno>>8;
	seq[3] = seqno;
	memset(&sha, 0, sizeof sha);
	sha1(secret, SHA1dlen, nil, &sha);
	sha1(data, len, nil, &sha);
	sha1(seq, 4, digest, &sha);
	return tsmemcmp(d, digest, SHA1dlen);
}

static int
SC_read(SConn *conn, uchar *buf, int n)
{
	SS *ss = (SS*)(conn->chan);
	uchar count[2], digest[SHA1dlen];
	int len, nr;

	if(read(ss->fd, count, 2) != 2 || (count[0]&0x80) == 0){
		werrstr("!SC_read invalid count");
		return -1;
	}
	len = (count[0]&0x7f)<<8 | count[1];	// SSL-style count; no pad
	if(ss->alg){
		len -= SHA1dlen;
		if(len <= 0 || readn(ss->fd, digest, SHA1dlen) != SHA1dlen){
			werrstr("!SC_read missing sha1");
			return -1;
		}
		if(len > n || readn(ss->fd, buf, len) != len){
			werrstr("!SC_read missing data");
			return -1;
		}
		rc4(&ss->in.rc4, digest, SHA1dlen);
		rc4(&ss->in.rc4, buf, len);
		if(verify(ss->in.secret, buf, len, ss->in.seqno, digest) != 0){
			werrstr("!SC_read integrity check failed");
			return -1;
		}
	}else{
		if(len <= 0 || len > n){
			werrstr("!SC_read implausible record length");
			return -1;
		}
		if( (nr = readn(ss->fd, buf, len)) != len){
			werrstr("!SC_read expected %d bytes, but got %d", len, nr);
			return -1;
		}
	}
	ss->in.seqno++;
	return len;
}

static int
SC_write(SConn *conn, uchar *buf, int n)
{
	SS *ss = (SS*)(conn->chan);
	uchar count[2], digest[SHA1dlen];
	int len;

	if(n <= 0 || n > Maxmsg+1){
		werrstr("!SC_write invalid n %d", n);
		return -1;
	}
	len = n;
	if(ss->alg)
		len += SHA1dlen;
	count[0] = 0x80 | len>>8;
	count[1] = len;
	if(write(ss->fd, count, 2) != 2){
		werrstr("!SC_write invalid count");
		return -1;
	}
	if(ss->alg){
		hash(ss->out.secret, buf, n, ss->out.seqno, digest);
		rc4(&ss->out.rc4, digest, SHA1dlen);
		rc4(&ss->out.rc4, buf, n);
		if(write(ss->fd, digest, SHA1dlen) != SHA1dlen ||
				write(ss->fd, buf, n) != n){
			werrstr("!SC_write error on send");
			return -1;
		}
	}else{
		if(write(ss->fd, buf, n) != n){
			werrstr("!SC_write error on send");
			return -1;
		}
	}
	ss->out.seqno++;
	return n;
}

static void
SC_free(SConn *conn)
{
	SS *ss = (SS*)(conn->chan);

	close(ss->fd);
	free(ss);
	free(conn);
}

SConn*
newSConn(int fd)
{
	SS *ss;
	SConn *conn;

	if(fd < 0)
		return nil;
	ss = (SS*)emalloc(sizeof(*ss));
	conn = (SConn*)emalloc(sizeof(*conn));
	ss->fd  = fd;
	ss->alg = 0;
	conn->chan = (void*)ss;
	conn->secretlen = SHA1dlen;
	conn->free = SC_free;
	conn->secret = SC_secret;
	conn->read = SC_read;
	conn->write = SC_write;
	return conn;
}

static void
writerr(SConn *conn, char *s)
{
	char buf[Maxmsg];

	snprint(buf, Maxmsg, "!%s", s);
	conn->write(conn, (uchar*)buf, strlen(buf));
}

static int
readstr(SConn *conn, char *s)
{
	int n;

	n = conn->read(conn, (uchar*)s, Maxmsg);
	if(n >= 0){
		s[n] = 0;
		if(s[0] == '!'){
			memmove(s, s+1, n);
			n = -1;
		}
	}else{
		strcpy(s, "read error");
	}
	return n;
}

static char*
getfile(SConn *conn, uchar *key, int nkey)
{
	char *buf;
	int nbuf, n, nr, len;
	char s[Maxmsg+1], *gf;
	uchar skey[SHA1dlen], ib[Maxmsg+CHK], *ibr, *ibw;
	AESstate aes;
	DigestState *sha;

	gf = "factotum";
	memset(&aes, 0, sizeof aes);

	snprint(s, Maxmsg, "GET %s\n", gf);
	conn->write(conn, (uchar*)s, strlen(s));

	/* get file size */
	s[0] = '\0';
	if(readstr(conn, s) < 0){
		werrstr("secstore: %r");
		return nil;
	}
	if((len = atoi(s)) < 0){
		werrstr("secstore: remote file %s does not exist", gf);
		return nil;
	}else if(len > MAXFILESIZE){//assert
		werrstr("secstore: implausible file size %d for %s", len, gf);
		return nil;
	}

	ibr = ibw = ib;
	buf = nil;
	nbuf = 0;
	for(nr=0; nr < len;){
		if((n = conn->read(conn, ibw, Maxmsg)) <= 0){
			werrstr("secstore: empty file chunk n=%d nr=%d len=%d: %r", n, nr, len);
			return nil;
		}
		nr += n;
		ibw += n;
		if(!aes.setup){ /* first time, read 16 byte IV */
			if(n < 16){
				werrstr("secstore: no IV in file");
				return nil;
			}
			sha = sha1((uchar*)"aescbc file", 11, nil, nil);
			sha1(key, nkey, skey, sha);
			setupAESstate(&aes, skey, AESbsize, ibr);
			memset(skey, 0, sizeof skey);
			ibr += AESbsize;
			n -= AESbsize;
		}
		aesCBCdecrypt(ibw-n, n, &aes);
		n = ibw-ibr-CHK;
		if(n > 0){
			buf = realloc(buf, nbuf+n+1);
			if(buf == nil)
				sysfatal("out of memory");
			memmove(buf+nbuf, ibr, n);
			nbuf += n;
			ibr += n;
		}
		memmove(ib, ibr, ibw-ibr);
		ibw = ib + (ibw-ibr);
		ibr = ib;
	}
	n = ibw-ibr;
	if((n != CHK) || (memcmp(ib, "XXXXXXXXXXXXXXXX", CHK) != 0)){
		werrstr("secstore: decrypted file failed to authenticate!");
		free(buf);
		return nil;
	}
	if(nbuf == 0){
		werrstr("secstore got empty file");
		return nil;
	}
	buf[nbuf] = '\0';
	return buf;
}

static char VERSION[] = "secstore";

typedef struct PAKparams{
	mpint *q, *p, *r, *g;
} PAKparams;

static PAKparams *pak;

// This group was generated by the seed EB7B6E35F7CD37B511D96C67D6688CC4DD440E1E.
static void
initPAKparams(void)
{
	if(pak)
		return;
	pak = (PAKparams*)emalloc(sizeof(*pak));
	pak->q = strtomp("E0F0EF284E10796C5A2A511E94748BA03C795C13", nil, 16, nil);
	pak->p = strtomp("C41CFBE4D4846F67A3DF7DE9921A49D3B42DC33728427AB159CEC8CBBD"
		"B12B5F0C244F1A734AEB9840804EA3C25036AD1B61AFF3ABBC247CD4B384224567A86"
		"3A6F020E7EE9795554BCD08ABAD7321AF27E1E92E3DB1C6E7E94FAAE590AE9C48F96D9"
		"3D178E809401ABE8A534A1EC44359733475A36A70C7B425125062B1142D", nil, 16, nil);
	pak->r = strtomp("DF310F4E54A5FEC5D86D3E14863921E834113E060F90052AD332B3241CEF"
		"2497EFA0303D6344F7C819691A0F9C4A773815AF8EAECFB7EC1D98F039F17A32A7E887"
		"D97251A927D093F44A55577F4D70444AEBD06B9B45695EC23962B175F266895C67D21"
		"C4656848614D888A4", nil, 16, nil);
	pak->g = strtomp("2F1C308DC46B9A44B52DF7DACCE1208CCEF72F69C743ADD4D2327173444"
		"ED6E65E074694246E07F9FD4AE26E0FDDD9F54F813C40CB9BCD4338EA6F242AB94CD41"
		"0E676C290368A16B1A3594877437E516C53A6EEE5493A038A017E955E218E7819734E3E"
		"2A6E0BAE08B14258F8C03CC1B30E0DDADFCF7CEDF0727684D3D255F1", nil, 16, nil);
}

// H = (sha(ver,C,sha(passphrase)))^r mod p,
// a hash function expensive to attack by brute force.
static void
longhash(char *ver, char *C, uchar *passwd, mpint *H)
{
	uchar *Cp;
	int i, n, nver, nC;
	uchar buf[140], key[1];

	nver = strlen(ver);
	nC = strlen(C);
	n = nver + nC + SHA1dlen;
	Cp = (uchar*)emalloc(n);
	memmove(Cp, ver, nver);
	memmove(Cp+nver, C, nC);
	memmove(Cp+nver+nC, passwd, SHA1dlen);
	for(i = 0; i < 7; i++){
		key[0] = 'A'+i;
		hmac_sha1(Cp, n, key, sizeof key, buf+i*SHA1dlen, nil);
	}
	memset(Cp, 0, n);
	free(Cp);
	betomp(buf, sizeof buf, H);
	mpmod(H, pak->p, H);
	mpexp(H, pak->r, pak->p, H);
}

// Hi = H^-1 mod p
static char *
PAK_Hi(char *C, char *passphrase, mpint *H, mpint *Hi)
{
	uchar passhash[SHA1dlen];

	sha1((uchar *)passphrase, strlen(passphrase), passhash, nil);
	initPAKparams();
	longhash(VERSION, C, passhash, H);
	mpinvert(H, pak->p, Hi);
	return mptoa(Hi, 64, nil, 0);
}

// another, faster, hash function for each party to
// confirm that the other has the right secrets.
static void
shorthash(char *mess, char *C, char *S, char *m, char *mu, char *sigma, char *Hi, uchar *digest)
{
	SHA1state *state;

	state = sha1((uchar*)mess, strlen(mess), 0, 0);
	state = sha1((uchar*)C, strlen(C), 0, state);
	state = sha1((uchar*)S, strlen(S), 0, state);
	state = sha1((uchar*)m, strlen(m), 0, state);
	state = sha1((uchar*)mu, strlen(mu), 0, state);
	state = sha1((uchar*)sigma, strlen(sigma), 0, state);
	state = sha1((uchar*)Hi, strlen(Hi), 0, state);
	state = sha1((uchar*)mess, strlen(mess), 0, state);
	state = sha1((uchar*)C, strlen(C), 0, state);
	state = sha1((uchar*)S, strlen(S), 0, state);
	state = sha1((uchar*)m, strlen(m), 0, state);
	state = sha1((uchar*)mu, strlen(mu), 0, state);
	state = sha1((uchar*)sigma, strlen(sigma), 0, state);
	sha1((uchar*)Hi, strlen(Hi), digest, state);
}

// On input, conn provides an open channel to the server;
//	C is the name this client calls itself;
//	pass is the user's passphrase
// On output, session secret has been set in conn
//	(unless return code is negative, which means failure).
//    If pS is not nil, it is set to the (alloc'd) name the server calls itself.
static int
PAKclient(SConn *conn, char *C, char *pass, char **pS)
{
	char *mess, *mess2, *eol, *S, *hexmu, *ks, *hexm, *hexsigma = nil, *hexHi;
	char kc[2*SHA1dlen+1];
	uchar digest[SHA1dlen];
	int rc = -1, n;
	mpint *x, *m = mpnew(0), *mu = mpnew(0), *sigma = mpnew(0);
	mpint *H = mpnew(0), *Hi = mpnew(0);

	hexHi = PAK_Hi(C, pass, H, Hi);

	// random 1<=x<=q-1; send C, m=g**x H
	x = mprand(164, genrandom, nil);
	mpmod(x, pak->q, x);
	if(mpcmp(x, mpzero) == 0)
		mpassign(mpone, x);
	mpexp(pak->g, x, pak->p, m);
	mpmul(m, H, m);
	mpmod(m, pak->p, m);
	hexm = mptoa(m, 64, nil, 0);
	mess = (char*)emalloc(2*Maxmsg+2);
	mess2 = mess+Maxmsg+1;
	snprint(mess, Maxmsg, "%s\tPAK\nC=%s\nm=%s\n", VERSION, C, hexm);
	conn->write(conn, (uchar*)mess, strlen(mess));

	// recv g**y, S, check hash1(g**xy)
	if(readstr(conn, mess) < 0){
		fprint(2, "error: %s\n", mess);
		writerr(conn, "couldn't read g**y");
		goto done;
	}
	eol = strchr(mess, '\n');
	if(strncmp("mu=", mess, 3) != 0 || !eol || strncmp("\nk=", eol, 3) != 0){
		writerr(conn, "verifier syntax error");
		goto done;
	}
	hexmu = mess+3;
	*eol = 0;
	ks = eol+3;
	eol = strchr(ks, '\n');
	if(!eol || strncmp("\nS=", eol, 3) != 0){
		writerr(conn, "verifier syntax error for secstore 1.0");
		goto done;
	}
	*eol = 0;
	S = eol+3;
	eol = strchr(S, '\n');
	if(!eol){
		writerr(conn, "verifier syntax error for secstore 1.0");
		goto done;
	}
	*eol = 0;
	if(pS)
		*pS = estrdup(S);
	strtomp(hexmu, nil, 64, mu);
	mpexp(mu, x, pak->p, sigma);
	hexsigma = mptoa(sigma, 64, nil, 0);
	shorthash("server", C, S, hexm, hexmu, hexsigma, hexHi, digest);
	enc64(kc, sizeof kc, digest, SHA1dlen);
	if(strcmp(ks, kc) != 0){
		writerr(conn, "verifier didn't match");
		goto done;
	}

	// send hash2(g**xy)
	shorthash("client", C, S, hexm, hexmu, hexsigma, hexHi, digest);
	enc64(kc, sizeof kc, digest, SHA1dlen);
	snprint(mess2, Maxmsg, "k'=%s\n", kc);
	conn->write(conn, (uchar*)mess2, strlen(mess2));

	// set session key
	shorthash("session", C, S, hexm, hexmu, hexsigma, hexHi, digest);
	memset(hexsigma, 0, strlen(hexsigma));
	n = conn->secret(conn, digest, 0);
	memset(digest, 0, SHA1dlen);
	if(n < 0){//assert
		writerr(conn, "can't set secret");
		goto done;
	}

	rc = 0;
done:
	mpfree(x);
	mpfree(sigma);
	mpfree(mu);
	mpfree(m);
	mpfree(Hi);
	mpfree(H);
	free(hexsigma);
	free(hexHi);
	free(hexm);
	free(mess);
	return rc;
}

char*
secstorefetch(char *addr, char *owner, char *password)
{
	int fd;
	char *rv;
	char s[Maxmsg+1], bye[10];
	SConn *conn;
	char *pass, *sta;

	sta = nil;
	conn = nil;
	rv = nil;
	if(password != nil && *password)
		pass = estrdup(password);
	else
		pass = readcons("secstore password", nil, 1);
	if(pass==nil || strlen(pass)==0){
		werrstr("cancel");
		goto Out;
	}
	if((fd = secdial(addr)) < 0)
		goto Out;
	if((conn = newSConn(fd)) == nil)
		goto Out;
	if(PAKclient(conn, owner, pass, nil) < 0){
		werrstr("password mistyped?");
		goto Out;
	}
	if(readstr(conn, s) < 0)
		goto Out;
	if(strcmp(s, "STA") == 0){
		sta = readcons("STA PIN+SecureID", nil, 1);
		if(sta==nil || strlen(sta)==0){
			werrstr("cancel");
			goto Out;
		}
		if(strlen(sta) >= sizeof s - 3){
			werrstr("STA response too long");
			goto Out;
		}
		strcpy(s+3, sta);
		conn->write(conn, (uchar*)s, strlen(s));
		readstr(conn, s);
	}
	if(strcmp(s, "OK") !=0){
		werrstr("%s", s);
		goto Out;
	}
	if((rv = getfile(conn, (uchar*)pass, strlen(pass))) == nil)
		goto Out;
	strcpy(bye, "BYE");
	conn->write(conn, (uchar*)bye, 3);

Out:
	if(conn)
		conn->free(conn);
	if(pass)
		free(pass);
	if(sta)
		free(sta);
	return rv;
}