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
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
|
/*
* SSH server for Unix: main program.
*
* ======================================================================
*
* This server is NOT SECURE!
*
* DO NOT DEPLOY IT IN A HOSTILE-FACING ENVIRONMENT!
*
* Its purpose is to speak the server end of everything PuTTY speaks
* on the client side, so that I can test that I haven't broken PuTTY
* when I reorganise its code, even things like RSA key exchange or
* chained auth methods which it's hard to find a server that speaks
* at all.
*
* It has no interaction with the OS's authentication system: the
* authentications it will accept are configurable by command-line
* option, and once you authenticate, it will run the connection
* protocol - including all subprocesses and shells - under the same
* Unix user id you started it under.
*
* It really is only suitable for testing the actual SSH protocol.
* Don't use it for anything more serious!
*
* ======================================================================
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <assert.h>
#include <stdarg.h>
#include <signal.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include <pwd.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include "putty.h"
#include "mpint.h"
#include "ssh.h"
#include "sshserver.h"
const char *const appname = "uppity";
void modalfatalbox(const char *p, ...)
{
va_list ap;
fprintf(stderr, "FATAL ERROR: ");
va_start(ap, p);
vfprintf(stderr, p, ap);
va_end(ap);
fputc('\n', stderr);
exit(1);
}
void nonfatal(const char *p, ...)
{
va_list ap;
fprintf(stderr, "ERROR: ");
va_start(ap, p);
vfprintf(stderr, p, ap);
va_end(ap);
fputc('\n', stderr);
}
char *platform_default_s(const char *name)
{
return NULL;
}
bool platform_default_b(const char *name, bool def)
{
return def;
}
int platform_default_i(const char *name, int def)
{
return def;
}
FontSpec *platform_default_fontspec(const char *name)
{
return fontspec_new("");
}
Filename *platform_default_filename(const char *name)
{
return filename_from_str("");
}
char *x_get_default(const char *key)
{
return NULL; /* this is a stub */
}
void old_keyfile_warning(void) { }
void timer_change_notify(unsigned long next)
{
}
char *platform_get_x_display(void) { return NULL; }
void make_unix_sftp_filehandle_key(void *data, size_t size)
{
random_read(data, size);
}
static bool verbose;
struct AuthPolicyShared {
struct AuthPolicy_ssh1_pubkey *ssh1keys;
struct AuthPolicy_ssh2_pubkey *ssh2keys;
};
struct AuthPolicy {
struct AuthPolicyShared *shared;
int kbdint_state;
};
struct server_instance {
unsigned id;
AuthPolicy ap;
LogPolicy logpolicy;
};
static void log_to_stderr(unsigned id, const char *msg)
{
if (id != (unsigned)-1)
fprintf(stderr, "#%u: ", id);
fputs(msg, stderr);
fputc('\n', stderr);
fflush(stderr);
}
static void server_eventlog(LogPolicy *lp, const char *event)
{
struct server_instance *inst = container_of(
lp, struct server_instance, logpolicy);
if (verbose)
log_to_stderr(inst->id, event);
}
static void server_logging_error(LogPolicy *lp, const char *event)
{
struct server_instance *inst = container_of(
lp, struct server_instance, logpolicy);
log_to_stderr(inst->id, event); /* unconditional */
}
static int server_askappend(
LogPolicy *lp, Filename *filename,
void (*callback)(void *ctx, int result), void *ctx)
{
return 2; /* always overwrite (FIXME: could make this a cmdline option) */
}
static const LogPolicyVtable server_logpolicy_vt = {
.eventlog = server_eventlog,
.askappend = server_askappend,
.logging_error = server_logging_error,
.verbose = null_lp_verbose_no,
};
struct AuthPolicy_ssh1_pubkey {
RSAKey key;
struct AuthPolicy_ssh1_pubkey *next;
};
struct AuthPolicy_ssh2_pubkey {
ptrlen public_blob;
struct AuthPolicy_ssh2_pubkey *next;
};
unsigned auth_methods(AuthPolicy *ap)
{
return (AUTHMETHOD_PUBLICKEY | AUTHMETHOD_PASSWORD | AUTHMETHOD_KBDINT |
AUTHMETHOD_TIS | AUTHMETHOD_CRYPTOCARD);
}
bool auth_none(AuthPolicy *ap, ptrlen username)
{
return false;
}
int auth_password(AuthPolicy *ap, ptrlen username, ptrlen password,
ptrlen *new_password_opt)
{
const char *PHONY_GOOD_PASSWORD = "weasel";
const char *PHONY_BAD_PASSWORD = "ferret";
if (!new_password_opt) {
/* Accept login with our preconfigured good password */
if (ptrlen_eq_string(password, PHONY_GOOD_PASSWORD))
return 1;
/* Don't outright reject the bad password, but insist on a change */
if (ptrlen_eq_string(password, PHONY_BAD_PASSWORD))
return 2;
/* Reject anything else */
return 0;
} else {
/* In a password-change request, expect the bad password as input */
if (!ptrlen_eq_string(password, PHONY_BAD_PASSWORD))
return 0;
/* Accept a request to change it to the good password */
if (ptrlen_eq_string(*new_password_opt, PHONY_GOOD_PASSWORD))
return 1;
/* Outright reject a request to change it to the same password
* as it already 'was' */
if (ptrlen_eq_string(*new_password_opt, PHONY_BAD_PASSWORD))
return 0;
/* Anything else, pretend the new pw wasn't good enough, and
* re-request a change */
return 2;
}
}
bool auth_publickey(AuthPolicy *ap, ptrlen username, ptrlen public_blob)
{
struct AuthPolicy_ssh2_pubkey *iter;
for (iter = ap->shared->ssh2keys; iter; iter = iter->next) {
if (ptrlen_eq_ptrlen(public_blob, iter->public_blob))
return true;
}
return false;
}
RSAKey *auth_publickey_ssh1(
AuthPolicy *ap, ptrlen username, mp_int *rsa_modulus)
{
struct AuthPolicy_ssh1_pubkey *iter;
for (iter = ap->shared->ssh1keys; iter; iter = iter->next) {
if (mp_cmp_eq(rsa_modulus, iter->key.modulus))
return &iter->key;
}
return NULL;
}
AuthKbdInt *auth_kbdint_prompts(AuthPolicy *ap, ptrlen username)
{
AuthKbdInt *aki;
switch (ap->kbdint_state) {
case 0:
aki = snew(AuthKbdInt);
aki->title = dupstr("Initial double prompt");
aki->instruction =
dupstr("First prompt should echo, second should not");
aki->nprompts = 2;
aki->prompts = snewn(aki->nprompts, AuthKbdIntPrompt);
aki->prompts[0].prompt = dupstr("Echoey prompt: ");
aki->prompts[0].echo = true;
aki->prompts[1].prompt = dupstr("Silent prompt: ");
aki->prompts[1].echo = false;
return aki;
case 1:
aki = snew(AuthKbdInt);
aki->title = dupstr("Zero-prompt step");
aki->instruction = dupstr("Shouldn't see any prompts this time");
aki->nprompts = 0;
aki->prompts = NULL;
return aki;
default:
ap->kbdint_state = 0;
return NULL;
}
}
int auth_kbdint_responses(AuthPolicy *ap, const ptrlen *responses)
{
switch (ap->kbdint_state) {
case 0:
if (ptrlen_eq_string(responses[0], "stoat") &&
ptrlen_eq_string(responses[1], "weasel")) {
ap->kbdint_state++;
return 0; /* those are the expected responses */
} else {
ap->kbdint_state = 0;
return -1;
}
break;
case 1:
return +1; /* succeed after the zero-prompt step */
default:
ap->kbdint_state = 0;
return -1;
}
}
char *auth_ssh1int_challenge(AuthPolicy *ap, unsigned method, ptrlen username)
{
/* FIXME: test returning a challenge string without \n, and ensure
* it gets printed as a prompt in its own right, without PuTTY
* making up a "Response: " prompt to follow it */
return dupprintf("This is a dummy %s challenge!\n",
(method == AUTHMETHOD_TIS ? "TIS" : "CryptoCard"));
}
bool auth_ssh1int_response(AuthPolicy *ap, ptrlen response)
{
return ptrlen_eq_string(response, "otter");
}
bool auth_successful(AuthPolicy *ap, ptrlen username, unsigned method)
{
return true;
}
static void safety_warning(FILE *fp)
{
fputs(" =================================================\n"
" THIS SSH SERVER IS NOT WRITTEN TO BE SECURE!\n"
" DO NOT DEPLOY IT IN A HOSTILE-FACING ENVIRONMENT!\n"
" =================================================\n", fp);
}
static void show_help(FILE *fp)
{
safety_warning(fp);
fputs("\n"
"usage: uppity [options]\n"
"options: --listen [PORT|PATH] listen to a port on localhost, or Unix socket\n"
" --listen-once (with --listen) stop after one "
"connection\n"
" --hostkey KEY SSH host key (need at least one)\n"
" --rsakexkey KEY key for SSH-2 RSA key exchange "
"(in SSH-1 format)\n"
" --userkey KEY public key"
" acceptable for user authentication\n"
" --sessiondir DIR cwd for session subprocess (default $HOME)\n"
" --bannertext TEXT send TEXT as SSH-2 auth banner\n"
" --bannerfile FILE send contents of FILE as SSH-2 auth "
"banner\n"
" --kexinit-kex STR override list of SSH-2 KEX methods\n"
" --kexinit-hostkey STR override list of SSH-2 host key "
"types\n"
" --kexinit-cscipher STR override list of SSH-2 "
"client->server ciphers\n"
" --kexinit-sccipher STR override list of SSH-2 "
"server->client ciphers\n"
" --kexinit-csmac STR override list of SSH-2 "
"client->server MACs\n"
" --kexinit-scmac STR override list of SSH-2 "
"server->client MACs\n"
" --kexinit-cscomp STR override list of SSH-2 "
"c->s compression types\n"
" --kexinit-sccomp STR override list of SSH-2 "
"s->c compression types\n"
" --ssh1-ciphers STR override list of SSH-1 ciphers\n"
" --ssh1-no-compression forbid compression in SSH-1\n"
" --exitsignum send buggy numeric \"exit-signal\" "
"message\n"
" --verbose print event log messages to standard "
"error\n"
" --sshlog FILE write SSH packet log to FILE\n"
" --sshrawlog FILE write SSH packets + raw data log"
" to FILE\n"
"also: uppity --help show this text\n"
" uppity --version show version information\n"
"\n", fp);
safety_warning(fp);
}
static void show_version_and_exit(void)
{
char *buildinfo_text = buildinfo("\n");
printf("%s: %s\n%s\n", appname, ver, buildinfo_text);
sfree(buildinfo_text);
exit(0);
}
const bool buildinfo_gtk_relevant = false;
static bool listening = false, listen_once = false;
static bool finished = false;
void server_instance_terminated(LogPolicy *lp)
{
struct server_instance *inst = container_of(
lp, struct server_instance, logpolicy);
if (listening && !listen_once) {
log_to_stderr(inst->id, "connection terminated");
} else {
finished = true;
}
sfree(inst);
}
static bool longoptarg(const char *arg, const char *expected,
const char **val, int *argcp, char ***argvp)
{
int len = strlen(expected);
if (memcmp(arg, expected, len))
return false;
if (arg[len] == '=') {
*val = arg + len + 1;
return true;
} else if (arg[len] == '\0') {
if (--*argcp > 0) {
*val = *++*argvp;
return true;
} else {
fprintf(stderr, "%s: option %s expects an argument\n",
appname, expected);
exit(1);
}
}
return false;
}
static bool longoptnoarg(const char *arg, const char *expected)
{
int len = strlen(expected);
if (memcmp(arg, expected, len))
return false;
if (arg[len] == '=') {
fprintf(stderr, "%s: option %s expects no argument\n",
appname, expected);
exit(1);
} else if (arg[len] == '\0') {
return true;
}
return false;
}
struct server_config {
Conf *conf;
const SshServerConfig *ssc;
ssh_key **hostkeys;
int nhostkeys;
RSAKey *hostkey1;
struct AuthPolicyShared *ap_shared;
unsigned next_id;
Socket *listening_socket;
Plug listening_plug;
};
static Plug *server_conn_plug(
struct server_config *cfg, struct server_instance **inst_out)
{
struct server_instance *inst = snew(struct server_instance);
memset(inst, 0, sizeof(*inst));
inst->id = cfg->next_id++;
inst->ap.shared = cfg->ap_shared;
inst->logpolicy.vt = &server_logpolicy_vt;
if (inst_out)
*inst_out = inst;
return ssh_server_plug(
cfg->conf, cfg->ssc, cfg->hostkeys, cfg->nhostkeys, cfg->hostkey1,
&inst->ap, &inst->logpolicy, &unix_live_sftpserver_vt);
}
static void server_log(Plug *plug, PlugLogType type, SockAddr *addr, int port,
const char *error_msg, int error_code)
{
log_to_stderr((unsigned)-1, error_msg);
}
static void server_closing(Plug *plug, const char *error_msg, int error_code,
bool calling_back)
{
log_to_stderr((unsigned)-1, error_msg);
}
static int server_accepting(Plug *p, accept_fn_t constructor, accept_ctx_t ctx)
{
struct server_config *cfg = container_of(
p, struct server_config, listening_plug);
Socket *s;
const char *err;
struct server_instance *inst;
if (listen_once) {
if (!cfg->listening_socket) /* in case of rapid double-accept */
return 1;
sk_close(cfg->listening_socket);
cfg->listening_socket = NULL;
}
unsigned old_next_id = cfg->next_id;
Plug *plug = server_conn_plug(cfg, &inst);
s = constructor(ctx, plug);
if ((err = sk_socket_error(s)) != NULL)
return 1;
SocketPeerInfo *pi = sk_peer_info(s);
if (pi->addressfamily != ADDRTYPE_LOCAL && !sk_peer_trusted(s)) {
fprintf(stderr, "rejected connection from %s (untrustworthy peer)\n",
pi->log_text);
sk_free_peer_info(pi);
sk_close(s);
cfg->next_id = old_next_id;
return 1;
}
char *msg = dupprintf("new connection from %s", pi->log_text);
log_to_stderr(inst->id, msg);
sfree(msg);
sk_free_peer_info(pi);
sk_set_frozen(s, false);
ssh_server_start(plug, s);
return 0;
}
static const PlugVtable server_plugvt = {
.log = server_log,
.closing = server_closing,
.accepting = server_accepting,
};
int main(int argc, char **argv)
{
int listen_port = -1;
const char *listen_socket = NULL;
ssh_key **hostkeys = NULL;
size_t nhostkeys = 0, hostkeysize = 0;
RSAKey *hostkey1 = NULL;
struct AuthPolicyShared aps;
SshServerConfig ssc;
Conf *conf = make_ssh_server_conf();
aps.ssh1keys = NULL;
aps.ssh2keys = NULL;
memset(&ssc, 0, sizeof(ssc));
ssc.application_name = "Uppity";
ssc.session_starting_dir = getenv("HOME");
ssc.ssh1_cipher_mask = SSH1_SUPPORTED_CIPHER_MASK;
ssc.ssh1_allow_compression = true;
if (argc <= 1) {
/*
* We're going to terminate with an error message below,
* because there are no host keys. But we'll display the help
* as additional standard-error output, if nothing else so
* that people see the giant safety warning.
*/
show_help(stderr);
fputc('\n', stderr);
}
while (--argc > 0) {
const char *arg = *++argv;
const char *val;
if (!strcmp(arg, "--help")) {
show_help(stdout);
exit(0);
} else if (longoptnoarg(arg, "--version")) {
show_version_and_exit();
} else if (longoptnoarg(arg, "--verbose") || !strcmp(arg, "-v")) {
verbose = true;
} else if (longoptarg(arg, "--listen", &val, &argc, &argv)) {
if (val[0] == '/') {
listen_port = -1;
listen_socket = val;
} else {
listen_port = atoi(val);
listen_socket = NULL;
}
} else if (!strcmp(arg, "--listen-once")) {
listen_once = true;
} else if (longoptarg(arg, "--hostkey", &val, &argc, &argv)) {
Filename *keyfile;
int keytype;
const char *error;
keyfile = filename_from_str(val);
keytype = key_type(keyfile);
if (keytype == SSH_KEYTYPE_SSH2) {
ssh2_userkey *uk;
ssh_key *key;
uk = ppk_load_f(keyfile, NULL, &error);
filename_free(keyfile);
if (!uk || !uk->key) {
fprintf(stderr, "%s: unable to load host key '%s': "
"%s\n", appname, val, error);
exit(1);
}
char *invalid = ssh_key_invalid(uk->key, 0);
if (invalid) {
fprintf(stderr, "%s: host key '%s' is unusable: "
"%s\n", appname, val, invalid);
exit(1);
}
key = uk->key;
sfree(uk->comment);
sfree(uk);
for (int i = 0; i < nhostkeys; i++)
if (ssh_key_alg(hostkeys[i]) == ssh_key_alg(key)) {
fprintf(stderr, "%s: host key '%s' duplicates key "
"type %s\n", appname, val,
ssh_key_alg(key)->ssh_id);
exit(1);
}
sgrowarray(hostkeys, hostkeysize, nhostkeys);
hostkeys[nhostkeys++] = key;
} else if (keytype == SSH_KEYTYPE_SSH1) {
if (hostkey1) {
fprintf(stderr, "%s: host key '%s' is a redundant "
"SSH-1 host key\n", appname, val);
exit(1);
}
hostkey1 = snew(RSAKey);
if (!rsa1_load_f(keyfile, hostkey1, NULL, &error)) {
fprintf(stderr, "%s: unable to load host key '%s': "
"%s\n", appname, val, error);
exit(1);
}
} else {
fprintf(stderr, "%s: '%s' is not loadable as a "
"private key (%s)", appname, val,
key_type_to_str(keytype));
exit(1);
}
} else if (longoptarg(arg, "--rsakexkey", &val, &argc, &argv)) {
Filename *keyfile;
int keytype;
const char *error;
keyfile = filename_from_str(val);
keytype = key_type(keyfile);
if (keytype != SSH_KEYTYPE_SSH1) {
fprintf(stderr, "%s: '%s' is not loadable as an SSH-1 format "
"private key (%s)", appname, val,
key_type_to_str(keytype));
exit(1);
}
if (ssc.rsa_kex_key) {
freersakey(ssc.rsa_kex_key);
} else {
ssc.rsa_kex_key = snew(RSAKey);
}
if (!rsa1_load_f(keyfile, ssc.rsa_kex_key, NULL, &error)) {
fprintf(stderr, "%s: unable to load RSA kex key '%s': "
"%s\n", appname, val, error);
exit(1);
}
ssc.rsa_kex_key->sshk.vt = &ssh_rsa;
} else if (longoptarg(arg, "--userkey", &val, &argc, &argv)) {
Filename *keyfile;
int keytype;
const char *error;
keyfile = filename_from_str(val);
keytype = key_type(keyfile);
if (keytype == SSH_KEYTYPE_SSH2_PUBLIC_RFC4716 ||
keytype == SSH_KEYTYPE_SSH2_PUBLIC_OPENSSH) {
strbuf *sb = strbuf_new();
struct AuthPolicy_ssh2_pubkey *node;
void *blob;
if (!ppk_loadpub_f(keyfile, NULL, BinarySink_UPCAST(sb),
NULL, &error)) {
fprintf(stderr, "%s: unable to load user key '%s': "
"%s\n", appname, val, error);
exit(1);
}
node = snew_plus(struct AuthPolicy_ssh2_pubkey, sb->len);
blob = snew_plus_get_aux(node);
memcpy(blob, sb->u, sb->len);
node->public_blob = make_ptrlen(blob, sb->len);
node->next = aps.ssh2keys;
aps.ssh2keys = node;
strbuf_free(sb);
} else if (keytype == SSH_KEYTYPE_SSH1_PUBLIC) {
strbuf *sb = strbuf_new();
BinarySource src[1];
struct AuthPolicy_ssh1_pubkey *node;
if (!rsa1_loadpub_f(keyfile, BinarySink_UPCAST(sb),
NULL, &error)) {
fprintf(stderr, "%s: unable to load user key '%s': "
"%s\n", appname, val, error);
exit(1);
}
node = snew(struct AuthPolicy_ssh1_pubkey);
BinarySource_BARE_INIT(src, sb->u, sb->len);
get_rsa_ssh1_pub(src, &node->key, RSA_SSH1_EXPONENT_FIRST);
node->next = aps.ssh1keys;
aps.ssh1keys = node;
strbuf_free(sb);
} else {
fprintf(stderr, "%s: '%s' is not loadable as a public key "
"(%s)\n", appname, val, key_type_to_str(keytype));
exit(1);
}
} else if (longoptarg(arg, "--bannerfile", &val, &argc, &argv)) {
FILE *fp = fopen(val, "r");
if (!fp) {
fprintf(stderr, "%s: %s: open: %s\n", appname,
val, strerror(errno));
exit(1);
}
strbuf *sb = strbuf_new();
if (!read_file_into(BinarySink_UPCAST(sb), fp)) {
fprintf(stderr, "%s: %s: read: %s\n", appname,
val, strerror(errno));
exit(1);
}
fclose(fp);
ssc.banner = ptrlen_from_strbuf(sb);
} else if (longoptarg(arg, "--bannertext", &val, &argc, &argv)) {
ssc.banner = ptrlen_from_asciz(val);
} else if (longoptarg(arg, "--sessiondir", &val, &argc, &argv)) {
ssc.session_starting_dir = val;
} else if (longoptarg(arg, "--kexinit-kex", &val, &argc, &argv)) {
ssc.kex_override[KEXLIST_KEX] = ptrlen_from_asciz(val);
} else if (longoptarg(arg, "--kexinit-hostkey", &val, &argc, &argv)) {
ssc.kex_override[KEXLIST_HOSTKEY] = ptrlen_from_asciz(val);
} else if (longoptarg(arg, "--kexinit-cscipher", &val, &argc, &argv)) {
ssc.kex_override[KEXLIST_CSCIPHER] = ptrlen_from_asciz(val);
} else if (longoptarg(arg, "--kexinit-csmac", &val, &argc, &argv)) {
ssc.kex_override[KEXLIST_CSMAC] = ptrlen_from_asciz(val);
} else if (longoptarg(arg, "--kexinit-cscomp", &val, &argc, &argv)) {
ssc.kex_override[KEXLIST_CSCOMP] = ptrlen_from_asciz(val);
} else if (longoptarg(arg, "--kexinit-sccipher", &val, &argc, &argv)) {
ssc.kex_override[KEXLIST_SCCIPHER] = ptrlen_from_asciz(val);
} else if (longoptarg(arg, "--kexinit-scmac", &val, &argc, &argv)) {
ssc.kex_override[KEXLIST_SCMAC] = ptrlen_from_asciz(val);
} else if (longoptarg(arg, "--kexinit-sccomp", &val, &argc, &argv)) {
ssc.kex_override[KEXLIST_SCCOMP] = ptrlen_from_asciz(val);
} else if (longoptarg(arg, "--ssh1-ciphers", &val, &argc, &argv)) {
ptrlen list = ptrlen_from_asciz(val);
ptrlen word;
unsigned long mask = 0;
while (word = ptrlen_get_word(&list, ","), word.len != 0) {
#define SSH1_CIPHER_CASE(bitpos, name) \
if (ptrlen_eq_string(word, name)) { \
mask |= 1U << bitpos; \
continue; \
}
SSH1_SUPPORTED_CIPHER_LIST(SSH1_CIPHER_CASE);
#undef SSH1_CIPHER_CASE
fprintf(stderr, "%s: unrecognised SSH-1 cipher '%.*s'\n",
appname, PTRLEN_PRINTF(word));
exit(1);
}
ssc.ssh1_cipher_mask = mask;
} else if (longoptnoarg(arg, "--ssh1-no-compression")) {
ssc.ssh1_allow_compression = false;
} else if (longoptnoarg(arg, "--exitsignum")) {
ssc.exit_signal_numeric = true;
} else if (longoptarg(arg, "--sshlog", &val, &argc, &argv) ||
longoptarg(arg, "-sshlog", &val, &argc, &argv)) {
Filename *logfile = filename_from_str(val);
conf_set_filename(conf, CONF_logfilename, logfile);
filename_free(logfile);
conf_set_int(conf, CONF_logtype, LGTYP_PACKETS);
conf_set_int(conf, CONF_logxfovr, LGXF_OVR);
} else if (longoptarg(arg, "--sshrawlog", &val, &argc, &argv) ||
longoptarg(arg, "-sshrawlog", &val, &argc, &argv)) {
Filename *logfile = filename_from_str(val);
conf_set_filename(conf, CONF_logfilename, logfile);
filename_free(logfile);
conf_set_int(conf, CONF_logtype, LGTYP_SSHRAW);
conf_set_int(conf, CONF_logxfovr, LGXF_OVR);
} else if (!strcmp(arg, "--pretend-to-accept-any-pubkey")) {
ssc.stunt_pretend_to_accept_any_pubkey = true;
} else if (!strcmp(arg, "--open-unconditional-agent-socket")) {
ssc.stunt_open_unconditional_agent_socket = true;
} else {
fprintf(stderr, "%s: unrecognised option '%s'\n", appname, arg);
exit(1);
}
}
if (nhostkeys == 0 && !hostkey1) {
fprintf(stderr, "%s: specify at least one host key\n", appname);
exit(1);
}
random_ref();
/*
* Block SIGPIPE, so that we'll get EPIPE individually on
* particular network connections that go wrong.
*/
putty_signal(SIGPIPE, SIG_IGN);
sk_init();
uxsel_init();
struct server_config scfg;
scfg.conf = conf;
scfg.ssc = &ssc;
scfg.hostkeys = hostkeys;
scfg.nhostkeys = nhostkeys;
scfg.hostkey1 = hostkey1;
scfg.ap_shared = &aps;
scfg.next_id = 0;
if (listen_port >= 0 || listen_socket) {
listening = true;
scfg.listening_plug.vt = &server_plugvt;
char *msg;
if (listen_port >= 0) {
scfg.listening_socket = sk_newlistener(
NULL, listen_port, &scfg.listening_plug, true,
ADDRTYPE_UNSPEC);
msg = dupprintf("%s: listening on port %d",
appname, listen_port);
} else {
SockAddr *addr = unix_sock_addr(listen_socket);
scfg.listening_socket = new_unix_listener(
addr, &scfg.listening_plug);
msg = dupprintf("%s: listening on Unix socket %s",
appname, listen_socket);
}
log_to_stderr(-1, msg);
sfree(msg);
} else {
struct server_instance *inst;
Plug *plug = server_conn_plug(&scfg, &inst);
ssh_server_start(plug, make_fd_socket(0, 1, -1, plug));
log_to_stderr(inst->id, "speaking SSH on stdio");
}
cli_main_loop(cliloop_no_pw_setup, cliloop_no_pw_check,
cliloop_always_continue, NULL);
return 0;
}
|