-
Notifications
You must be signed in to change notification settings - Fork 5
/
cmdgen.c
1362 lines (1259 loc) · 47.6 KB
/
cmdgen.c
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
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* cmdgen.c - command-line form of PuTTYgen
*/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <limits.h>
#include <assert.h>
#include <time.h>
#include <errno.h>
#include <string.h>
#include "putty.h"
#include "ssh.h"
#include "sshkeygen.h"
#include "mpint.h"
static FILE *progress_fp = NULL;
static bool linear_progress_phase;
static unsigned last_progress_col;
static ProgressPhase cmdgen_progress_add_linear(
ProgressReceiver *prog, double c)
{
ProgressPhase ph = { .n = 0 };
return ph;
}
static ProgressPhase cmdgen_progress_add_probabilistic(
ProgressReceiver *prog, double c, double p)
{
ProgressPhase ph = { .n = 1 };
return ph;
}
static void cmdgen_progress_start_phase(ProgressReceiver *prog,
ProgressPhase p)
{
linear_progress_phase = (p.n == 0);
last_progress_col = 0;
}
static void cmdgen_progress_report(ProgressReceiver *prog, double p)
{
unsigned new_col = p * 64 + 0.5;
for (; last_progress_col < new_col; last_progress_col++)
fputc('+', progress_fp);
}
static void cmdgen_progress_report_attempt(ProgressReceiver *prog)
{
if (progress_fp) {
fputc('+', progress_fp);
fflush(progress_fp);
}
}
static void cmdgen_progress_report_phase_complete(ProgressReceiver *prog)
{
if (linear_progress_phase)
cmdgen_progress_report(prog, 1.0);
if (progress_fp) {
fputc('\n', progress_fp);
fflush(progress_fp);
}
}
static const ProgressReceiverVtable cmdgen_progress_vt = {
.add_linear = cmdgen_progress_add_linear,
.add_probabilistic = cmdgen_progress_add_probabilistic,
.ready = null_progress_ready,
.start_phase = cmdgen_progress_start_phase,
.report = cmdgen_progress_report,
.report_attempt = cmdgen_progress_report_attempt,
.report_phase_complete = cmdgen_progress_report_phase_complete,
};
static ProgressReceiver cmdgen_progress = { .vt = &cmdgen_progress_vt };
/*
* Stubs to let everything else link sensibly.
*/
char *x_get_default(const char *key)
{
return NULL;
}
void sk_cleanup(void)
{
}
void showversion(void)
{
char *buildinfo_text = buildinfo("\n");
printf("puttygen: %s\n%s\n", ver, buildinfo_text);
sfree(buildinfo_text);
}
void usage(bool standalone)
{
fprintf(standalone ? stderr : stdout,
"Usage: puttygen ( keyfile | -t type [ -b bits ] )\n"
" [ -C comment ] [ -P ] [ -q ]\n"
" [ -o output-keyfile ] [ -O type | -l | -L"
" | -p ]\n");
if (standalone)
fprintf(stderr,
"Use \"puttygen --help\" for more detail.\n");
}
void help(void)
{
/*
* Help message is an extended version of the usage message. So
* start with that, plus a version heading.
*/
printf("PuTTYgen: key generator and converter for the PuTTY tools\n"
"%s\n", ver);
usage(false);
printf(" -t specify key type when generating:\n"
" eddsa, ecdsa, rsa, dsa, rsa1 use with -b\n"
" ed25519, ed448 special cases of eddsa\n"
" -b specify number of bits when generating key\n"
" -C change or specify key comment\n"
" -P change key passphrase\n"
" -q quiet: do not display progress bar\n"
" -O specify output type:\n"
" private output PuTTY private key format\n"
" private-openssh export OpenSSH private key\n"
" private-openssh-new export OpenSSH private key "
"(force new format)\n"
" private-sshcom export ssh.com private key\n"
" public RFC 4716 / ssh.com public key\n"
" public-openssh OpenSSH public key\n"
" fingerprint output the key fingerprint\n"
" text output the key components as "
"'name=0x####'\n"
" -o specify output file\n"
" -l equivalent to `-O fingerprint'\n"
" -L equivalent to `-O public-openssh'\n"
" -p equivalent to `-O public'\n"
" --dump equivalent to `-O text'\n"
" --reencrypt load a key and save it with fresh "
"encryption\n"
" --old-passphrase file\n"
" specify file containing old key passphrase\n"
" --new-passphrase file\n"
" specify file containing new key passphrase\n"
" --random-device device\n"
" specify device to read entropy from (e.g. /dev/urandom)\n"
" --primes <type> select prime-generation method:\n"
" probable conventional probabilistic prime finding\n"
" proven numbers that have been proven to be prime\n"
" proven-even also try harder for an even distribution\n"
" --strong-rsa use \"strong\" primes as RSA key factors\n"
" --ppk-param <key>=<value>[,<key>=<value>,...]\n"
" specify parameters when writing PuTTY private key file "
"format:\n"
" version PPK format version (min 2, max 3, "
"default 3)\n"
" kdf key derivation function (argon2id, "
"argon2i, argon2d)\n"
" memory Kbyte of memory to use in passphrase "
"hash\n"
" (default 8192)\n"
" time approx milliseconds to hash for "
"(default 100)\n"
" passes number of hash passes to run "
"(alternative to 'time')\n"
" parallelism number of parallelisable threads in the "
"hash function\n"
" (default 1)\n"
);
}
static bool move(char *from, char *to)
{
int ret;
ret = rename(from, to);
if (ret) {
/*
* This OS may require us to remove the original file first.
*/
remove(to);
ret = rename(from, to);
}
if (ret) {
perror("puttygen: cannot move new file on to old one");
return false;
}
return true;
}
static char *readpassphrase(const char *filename)
{
FILE *fp;
char *line;
fp = fopen(filename, "r");
if (!fp) {
fprintf(stderr, "puttygen: cannot open %s: %s\n",
filename, strerror(errno));
return NULL;
}
line = fgetline(fp);
if (line)
line[strcspn(line, "\r\n")] = '\0';
else if (ferror(fp))
fprintf(stderr, "puttygen: error reading from %s: %s\n",
filename, strerror(errno));
else /* empty file */
line = dupstr("");
fclose(fp);
return line;
}
#define DEFAULT_RSADSA_BITS 2048
/* For Unix in particular, but harmless if this main() is reused elsewhere */
const bool buildinfo_gtk_relevant = false;
int main(int argc, char **argv)
{
char *infile = NULL;
Filename *infilename = NULL, *outfilename = NULL;
LoadedFile *infile_lf = NULL;
BinarySource *infile_bs = NULL;
enum { NOKEYGEN, RSA1, RSA2, DSA, ECDSA, EDDSA } keytype = NOKEYGEN;
char *outfile = NULL, *outfiletmp = NULL;
enum { PRIVATE, PUBLIC, PUBLICO, FP, OPENSSH_AUTO,
OPENSSH_NEW, SSHCOM, TEXT } outtype = PRIVATE;
int bits = -1;
const char *comment = NULL;
char *origcomment = NULL;
bool change_passphrase = false, reencrypt = false;
bool errs = false, nogo = false;
int intype = SSH_KEYTYPE_UNOPENABLE;
int sshver = 0;
ssh2_userkey *ssh2key = NULL;
RSAKey *ssh1key = NULL;
strbuf *ssh2blob = NULL;
char *ssh2alg = NULL;
char *old_passphrase = NULL, *new_passphrase = NULL;
bool load_encrypted;
const char *random_device = NULL;
int exit_status = 0;
const PrimeGenerationPolicy *primegen = &primegen_probabilistic;
bool strong_rsa = false;
ppk_save_parameters params = ppk_save_default_parameters;
FingerprintType fptype = SSH_FPTYPE_DEFAULT;
if (is_interactive())
progress_fp = stderr;
#define RETURN(status) do { exit_status = (status); goto out; } while (0)
/* ------------------------------------------------------------------
* Parse the command line to figure out what we've been asked to do.
*/
/*
* If run with no arguments at all, print the usage message and
* return success.
*/
if (argc <= 1) {
usage(true);
RETURN(0);
}
/*
* Parse command line arguments.
*/
while (--argc) {
char *p = *++argv;
if (p[0] == '-' && p[1]) {
/*
* An option.
*/
while (p && *++p) {
char c = *p;
switch (c) {
case '-': {
/*
* Long option.
*/
char *opt, *val;
opt = p++; /* opt will have _one_ leading - */
while (*p && *p != '=')
p++; /* find end of option */
if (*p == '=') {
*p++ = '\0';
val = p;
} else
val = NULL;
if (!strcmp(opt, "-help")) {
if (val) {
errs = true;
fprintf(stderr, "puttygen: option `-%s'"
" expects no argument\n", opt);
} else {
help();
nogo = true;
}
} else if (!strcmp(opt, "-version")) {
if (val) {
errs = true;
fprintf(stderr, "puttygen: option `-%s'"
" expects no argument\n", opt);
} else {
showversion();
nogo = true;
}
} else if (!strcmp(opt, "-pgpfp")) {
if (val) {
errs = true;
fprintf(stderr, "puttygen: option `-%s'"
" expects no argument\n", opt);
} else {
/* support --pgpfp for consistency */
pgp_fingerprints();
nogo = true;
}
} else if (!strcmp(opt, "-old-passphrase")) {
if (!val && argc > 1)
--argc, val = *++argv;
if (!val) {
errs = true;
fprintf(stderr, "puttygen: option `-%s'"
" expects an argument\n", opt);
} else {
old_passphrase = readpassphrase(val);
if (!old_passphrase)
errs = true;
}
} else if (!strcmp(opt, "-new-passphrase")) {
if (!val && argc > 1)
--argc, val = *++argv;
if (!val) {
errs = true;
fprintf(stderr, "puttygen: option `-%s'"
" expects an argument\n", opt);
} else {
new_passphrase = readpassphrase(val);
if (!new_passphrase)
errs = true;
}
} else if (!strcmp(opt, "-random-device")) {
if (!val && argc > 1)
--argc, val = *++argv;
if (!val) {
errs = true;
fprintf(stderr, "puttygen: option `-%s'"
" expects an argument\n", opt);
} else {
random_device = val;
}
} else if (!strcmp(opt, "-dump")) {
outtype = TEXT;
} else if (!strcmp(opt, "-primes")) {
if (!val && argc > 1)
--argc, val = *++argv;
if (!val) {
errs = true;
fprintf(stderr, "puttygen: option `-%s'"
" expects an argument\n", opt);
} else if (!strcmp(val, "probable") ||
!strcmp(val, "probabilistic")) {
primegen = &primegen_probabilistic;
} else if (!strcmp(val, "provable") ||
!strcmp(val, "proven") ||
!strcmp(val, "simple") ||
!strcmp(val, "maurer-simple")) {
primegen = &primegen_provable_maurer_simple;
} else if (!strcmp(val, "provable-even") ||
!strcmp(val, "proven-even") ||
!strcmp(val, "even") ||
!strcmp(val, "complex") ||
!strcmp(val, "maurer-complex")) {
primegen = &primegen_provable_maurer_complex;
} else {
errs = true;
fprintf(stderr, "puttygen: unrecognised prime-"
"generation mode `%s'\n", val);
}
} else if (!strcmp(opt, "-strong-rsa")) {
strong_rsa = true;
} else if (!strcmp(opt, "-reencrypt")) {
reencrypt = true;
} else if (!strcmp(opt, "-ppk-param") ||
!strcmp(opt, "-ppk-params")) {
if (!val && argc > 1)
--argc, val = *++argv;
if (!val) {
errs = true;
fprintf(stderr, "puttygen: option `-%s'"
" expects an argument\n", opt);
} else {
char *nextval;
for (; val; val = nextval) {
nextval = strchr(val, ',');
if (nextval)
*nextval++ = '\0';
char *optvalue = strchr(val, '=');
if (!optvalue) {
errs = true;
fprintf(stderr, "puttygen: PPK parameter "
"'%s' expected a value\n", val);
continue;
}
*optvalue++ = '\0';
/* Non-numeric options */
if (!strcmp(val, "kdf")) {
if (!strcmp(optvalue, "Argon2id") ||
!strcmp(optvalue, "argon2id")) {
params.argon2_flavour = Argon2id;
} else if (!strcmp(optvalue, "Argon2i") ||
!strcmp(optvalue, "argon2i")) {
params.argon2_flavour = Argon2i;
} else if (!strcmp(optvalue, "Argon2d") ||
!strcmp(optvalue, "argon2d")) {
params.argon2_flavour = Argon2d;
} else {
errs = true;
fprintf(stderr, "puttygen: unrecognise"
"d kdf '%s'\n", optvalue);
}
continue;
}
char *end;
unsigned long n = strtoul(optvalue, &end, 0);
if (!*optvalue || *end) {
errs = true;
fprintf(stderr, "puttygen: value '%s' for "
"PPK parameter '%s': expected a "
"number\n", optvalue, val);
continue;
}
if (!strcmp(val, "version")) {
params.fmt_version = n;
} else if (!strcmp(val, "memory") ||
!strcmp(val, "mem")) {
params.argon2_mem = n;
} else if (!strcmp(val, "time")) {
params.argon2_passes_auto = true;
params.argon2_milliseconds = n;
} else if (!strcmp(val, "passes")) {
params.argon2_passes_auto = false;
params.argon2_passes = n;
} else if (!strcmp(val, "parallelism") ||
!strcmp(val, "parallel")) {
params.argon2_parallelism = n;
} else {
errs = true;
fprintf(stderr, "puttygen: unrecognised "
"PPK parameter '%s'\n", val);
continue;
}
}
}
} else {
errs = true;
fprintf(stderr,
"puttygen: no such option `-%s'\n", opt);
}
p = NULL;
break;
}
case 'h':
case 'V':
case 'P':
case 'l':
case 'L':
case 'p':
case 'q':
/*
* Option requiring no parameter.
*/
switch (c) {
case 'h':
help();
nogo = true;
break;
case 'V':
showversion();
nogo = true;
break;
case 'P':
change_passphrase = true;
break;
case 'l':
outtype = FP;
break;
case 'L':
outtype = PUBLICO;
break;
case 'p':
outtype = PUBLIC;
break;
case 'q':
progress_fp = NULL;
break;
}
break;
case 't':
case 'b':
case 'C':
case 'O':
case 'o':
case 'E':
/*
* Option requiring parameter.
*/
p++;
if (!*p && argc > 1)
--argc, p = *++argv;
else if (!*p) {
fprintf(stderr, "puttygen: option `-%c' expects a"
" parameter\n", c);
errs = true;
}
/*
* Now c is the option and p is the parameter.
*/
switch (c) {
case 't':
if (!strcmp(p, "rsa") || !strcmp(p, "rsa2"))
keytype = RSA2, sshver = 2;
else if (!strcmp(p, "rsa1"))
keytype = RSA1, sshver = 1;
else if (!strcmp(p, "dsa") || !strcmp(p, "dss"))
keytype = DSA, sshver = 2;
else if (!strcmp(p, "ecdsa"))
keytype = ECDSA, sshver = 2;
else if (!strcmp(p, "eddsa"))
keytype = EDDSA, sshver = 2;
else if (!strcmp(p, "ed25519"))
keytype = EDDSA, bits = 255, sshver = 2;
else if (!strcmp(p, "ed448"))
keytype = EDDSA, bits = 448, sshver = 2;
else {
fprintf(stderr,
"puttygen: unknown key type `%s'\n", p);
errs = true;
}
break;
case 'b':
bits = atoi(p);
break;
case 'C':
comment = p;
break;
case 'O':
if (!strcmp(p, "public"))
outtype = PUBLIC;
else if (!strcmp(p, "public-openssh"))
outtype = PUBLICO;
else if (!strcmp(p, "private"))
outtype = PRIVATE;
else if (!strcmp(p, "fingerprint"))
outtype = FP;
else if (!strcmp(p, "private-openssh"))
outtype = OPENSSH_AUTO, sshver = 2;
else if (!strcmp(p, "private-openssh-new"))
outtype = OPENSSH_NEW, sshver = 2;
else if (!strcmp(p, "private-sshcom"))
outtype = SSHCOM, sshver = 2;
else if (!strcmp(p, "text"))
outtype = TEXT;
else {
fprintf(stderr,
"puttygen: unknown output type `%s'\n", p);
errs = true;
}
break;
case 'o':
outfile = p;
break;
case 'E':
if (!strcmp(p, "md5"))
fptype = SSH_FPTYPE_MD5;
else if (!strcmp(p, "sha256"))
fptype = SSH_FPTYPE_SHA256;
else {
fprintf(stderr, "puttygen: unknown fingerprint "
"type `%s'\n", p);
errs = true;
}
break;
}
p = NULL; /* prevent continued processing */
break;
default:
/*
* Unrecognised option.
*/
errs = true;
fprintf(stderr, "puttygen: no such option `-%c'\n", c);
break;
}
}
} else {
/*
* A non-option argument.
*/
if (!infile)
infile = p;
else {
errs = true;
fprintf(stderr, "puttygen: cannot handle more than one"
" input file\n");
}
}
}
if (bits == -1) {
/*
* No explicit key size was specified. Default varies
* depending on key type.
*/
switch (keytype) {
case ECDSA:
bits = 384;
break;
case EDDSA:
bits = 255;
break;
default:
bits = DEFAULT_RSADSA_BITS;
break;
}
}
if (keytype == ECDSA || keytype == EDDSA) {
const char *name = (keytype == ECDSA ? "ECDSA" : "EdDSA");
const int *valid_lengths = (keytype == ECDSA ? ec_nist_curve_lengths :
ec_ed_curve_lengths);
size_t n_lengths = (keytype == ECDSA ? n_ec_nist_curve_lengths :
n_ec_ed_curve_lengths);
bool (*alg_and_curve_by_bits)(int, const struct ec_curve **,
const ssh_keyalg **) =
(keytype == ECDSA ? ec_nist_alg_and_curve_by_bits :
ec_ed_alg_and_curve_by_bits);
const struct ec_curve *curve;
const ssh_keyalg *alg;
if (!alg_and_curve_by_bits(bits, &curve, &alg)) {
fprintf(stderr, "puttygen: invalid bits for %s, choose", name);
for (size_t i = 0; i < n_lengths; i++)
fprintf(stderr, "%s%d", (i == 0 ? " " :
i == n_lengths-1 ? " or " : ", "),
valid_lengths[i]);
fputc('\n', stderr);
errs = true;
}
}
if (keytype == RSA2 || keytype == RSA1 || keytype == DSA) {
if (bits < 256) {
fprintf(stderr, "puttygen: cannot generate %s keys shorter than"
" 256 bits\n", (keytype == DSA ? "DSA" : "RSA"));
errs = true;
} else if (bits < DEFAULT_RSADSA_BITS) {
fprintf(stderr, "puttygen: warning: %s keys shorter than"
" %d bits are probably not secure\n",
(keytype == DSA ? "DSA" : "RSA"), DEFAULT_RSADSA_BITS);
/* but this is just a warning, so proceed anyway */
}
}
if (errs)
RETURN(1);
if (nogo)
RETURN(0);
/*
* If run with at least one argument _but_ not the required
* ones, print the usage message and return failure.
*/
if (!infile && keytype == NOKEYGEN) {
usage(true);
RETURN(1);
}
/* ------------------------------------------------------------------
* Figure out further details of exactly what we're going to do.
*/
/*
* Bomb out if we've been asked to both load and generate a
* key.
*/
if (keytype != NOKEYGEN && infile) {
fprintf(stderr, "puttygen: cannot both load and generate a key\n");
RETURN(1);
}
/*
* We must save the private part when generating a new key.
*/
if (keytype != NOKEYGEN &&
(outtype != PRIVATE && outtype != OPENSSH_AUTO &&
outtype != OPENSSH_NEW && outtype != SSHCOM && outtype != TEXT)) {
fprintf(stderr, "puttygen: this would generate a new key but "
"discard the private part\n");
RETURN(1);
}
/*
* Analyse the type of the input file, in case this affects our
* course of action.
*/
if (infile) {
const char *load_error;
infilename = filename_from_str(infile);
if (!strcmp(infile, "-"))
infile_lf = lf_load_keyfile_fp(stdin, &load_error);
else
infile_lf = lf_load_keyfile(infilename, &load_error);
if (!infile_lf) {
fprintf(stderr, "puttygen: unable to load file `%s': %s\n",
infile, load_error);
RETURN(1);
}
infile_bs = BinarySource_UPCAST(infile_lf);
intype = key_type_s(infile_bs);
BinarySource_REWIND(infile_bs);
switch (intype) {
case SSH_KEYTYPE_UNOPENABLE:
case SSH_KEYTYPE_UNKNOWN:
fprintf(stderr, "puttygen: unable to load file `%s': %s\n",
infile, key_type_to_str(intype));
RETURN(1);
case SSH_KEYTYPE_SSH1:
case SSH_KEYTYPE_SSH1_PUBLIC:
if (sshver == 2) {
fprintf(stderr, "puttygen: conversion from SSH-1 to SSH-2 keys"
" not supported\n");
RETURN(1);
}
sshver = 1;
break;
case SSH_KEYTYPE_SSH2:
case SSH_KEYTYPE_SSH2_PUBLIC_RFC4716:
case SSH_KEYTYPE_SSH2_PUBLIC_OPENSSH:
case SSH_KEYTYPE_OPENSSH_PEM:
case SSH_KEYTYPE_OPENSSH_NEW:
case SSH_KEYTYPE_SSHCOM:
if (sshver == 1) {
fprintf(stderr, "puttygen: conversion from SSH-2 to SSH-1 keys"
" not supported\n");
RETURN(1);
}
sshver = 2;
break;
case SSH_KEYTYPE_OPENSSH_AUTO:
default:
unreachable("Should never see these types on an input file");
}
}
/*
* Determine the default output file, if none is provided.
*
* This will usually be equal to stdout, except that if the
* input and output file formats are the same then the default
* output is to overwrite the input.
*
* Also in this code, we bomb out if the input and output file
* formats are the same and no other action is performed.
*/
if ((intype == SSH_KEYTYPE_SSH1 && outtype == PRIVATE) ||
(intype == SSH_KEYTYPE_SSH2 && outtype == PRIVATE) ||
(intype == SSH_KEYTYPE_OPENSSH_PEM && outtype == OPENSSH_AUTO) ||
(intype == SSH_KEYTYPE_OPENSSH_NEW && outtype == OPENSSH_NEW) ||
(intype == SSH_KEYTYPE_SSHCOM && outtype == SSHCOM)) {
if (!outfile) {
outfile = infile;
outfiletmp = dupcat(outfile, ".tmp");
}
if (!change_passphrase && !comment && !reencrypt) {
fprintf(stderr, "puttygen: this command would perform no useful"
" action\n");
RETURN(1);
}
} else {
if (!outfile) {
/*
* Bomb out rather than automatically choosing to write
* a private key file to stdout.
*/
if (outtype == PRIVATE || outtype == OPENSSH_AUTO ||
outtype == OPENSSH_NEW || outtype == SSHCOM) {
fprintf(stderr, "puttygen: need to specify an output file\n");
RETURN(1);
}
}
}
/*
* Figure out whether we need to load the encrypted part of the
* key. This will be the case if (a) we need to write out
* a private key format, (b) the entire input key file is
* encrypted, or (c) we're outputting TEXT, in which case we
* want all of the input file including private material if it
* exists.
*/
bool intype_entirely_encrypted =
intype == SSH_KEYTYPE_OPENSSH_PEM ||
intype == SSH_KEYTYPE_OPENSSH_NEW ||
intype == SSH_KEYTYPE_SSHCOM;
bool intype_has_private =
!(intype == SSH_KEYTYPE_SSH1_PUBLIC ||
intype == SSH_KEYTYPE_SSH2_PUBLIC_RFC4716 ||
intype == SSH_KEYTYPE_SSH2_PUBLIC_OPENSSH);
bool outtype_has_private =
outtype == PRIVATE || outtype == OPENSSH_AUTO ||
outtype == OPENSSH_NEW || outtype == SSHCOM;
if (outtype_has_private || intype_entirely_encrypted ||
(outtype == TEXT && intype_has_private))
load_encrypted = true;
else
load_encrypted = false;
if (load_encrypted && !intype_has_private) {
fprintf(stderr, "puttygen: cannot perform this action on a "
"public-key-only input file\n");
RETURN(1);
}
/* ------------------------------------------------------------------
* Now we're ready to actually do some stuff.
*/
/*
* Either load or generate a key.
*/
if (keytype != NOKEYGEN) {
char *entropy;
char default_comment[80];
struct tm tm;
tm = ltime();
if (keytype == DSA)
strftime(default_comment, 30, "dsa-key-%Y%m%d", &tm);
else if (keytype == ECDSA)
strftime(default_comment, 30, "ecdsa-key-%Y%m%d", &tm);
else if (keytype == EDDSA && bits == 255)
strftime(default_comment, 30, "ed25519-key-%Y%m%d", &tm);
else if (keytype == EDDSA)
strftime(default_comment, 30, "eddsa-key-%Y%m%d", &tm);
else
strftime(default_comment, 30, "rsa-key-%Y%m%d", &tm);
entropy = get_random_data(bits / 8, random_device);
if (!entropy) {
fprintf(stderr, "puttygen: failed to collect entropy, "
"could not generate key\n");
RETURN(1);
}
random_setup_special();
random_reseed(make_ptrlen(entropy, bits / 8));
smemclr(entropy, bits/8);
sfree(entropy);
PrimeGenerationContext *pgc = primegen_new_context(primegen);
if (keytype == DSA) {
struct dss_key *dsskey = snew(struct dss_key);
dsa_generate(dsskey, bits, pgc, &cmdgen_progress);
ssh2key = snew(ssh2_userkey);
ssh2key->key = &dsskey->sshk;
ssh1key = NULL;
} else if (keytype == ECDSA) {
struct ecdsa_key *ek = snew(struct ecdsa_key);
ecdsa_generate(ek, bits);
ssh2key = snew(ssh2_userkey);
ssh2key->key = &ek->sshk;
ssh1key = NULL;
} else if (keytype == EDDSA) {
struct eddsa_key *ek = snew(struct eddsa_key);
eddsa_generate(ek, bits);
ssh2key = snew(ssh2_userkey);
ssh2key->key = &ek->sshk;
ssh1key = NULL;
} else {
RSAKey *rsakey = snew(RSAKey);
rsa_generate(rsakey, bits, strong_rsa, pgc, &cmdgen_progress);
rsakey->comment = NULL;
if (keytype == RSA1) {
ssh1key = rsakey;
} else {
ssh2key = snew(ssh2_userkey);
ssh2key->key = &rsakey->sshk;
}
}
primegen_free_context(pgc);
if (ssh2key)
ssh2key->comment = dupstr(default_comment);
if (ssh1key)
ssh1key->comment = dupstr(default_comment);
} else {
const char *error = NULL;
bool encrypted;
assert(infile != NULL);
sfree(origcomment);
origcomment = NULL;
/*
* Find out whether the input key is encrypted.
*/
if (intype == SSH_KEYTYPE_SSH1)
encrypted = rsa1_encrypted_s(infile_bs, &origcomment);
else if (intype == SSH_KEYTYPE_SSH2)
encrypted = ppk_encrypted_s(infile_bs, &origcomment);
else
encrypted = import_encrypted_s(infilename, infile_bs,
intype, &origcomment);
BinarySource_REWIND(infile_bs);
/*
* If so, ask for a passphrase.
*/
if (encrypted && load_encrypted) {
if (!old_passphrase) {
prompts_t *p = new_prompts();
int ret;
p->to_server = false;
p->from_server = false;
p->name = dupstr("SSH key passphrase");
add_prompt(p, dupstr("Enter passphrase to load key: "), false);
ret = console_get_userpass_input(p);
assert(ret >= 0);
if (!ret) {
free_prompts(p);
perror("puttygen: unable to read passphrase");
RETURN(1);
} else {
old_passphrase = prompt_get_result(p->prompts[0]);
free_prompts(p);
}
}
} else {
old_passphrase = NULL;
}
switch (intype) {
int ret;
case SSH_KEYTYPE_SSH1:
case SSH_KEYTYPE_SSH1_PUBLIC:
ssh1key = snew(RSAKey);
memset(ssh1key, 0, sizeof(RSAKey));
if (!load_encrypted) {
strbuf *blob;
BinarySource src[1];
sfree(origcomment);
origcomment = NULL;
blob = strbuf_new();
ret = rsa1_loadpub_s(infile_bs, BinarySink_UPCAST(blob),
&origcomment, &error);
BinarySource_BARE_INIT(src, blob->u, blob->len);
get_rsa_ssh1_pub(src, ssh1key, RSA_SSH1_EXPONENT_FIRST);
strbuf_free(blob);
ssh1key->comment = dupstr(origcomment);
ssh1key->private_exponent = NULL;
ssh1key->p = NULL;
ssh1key->q = NULL;
ssh1key->iqmp = NULL;
} else {
ret = rsa1_load_s(infile_bs, ssh1key, old_passphrase, &error);
}
BinarySource_REWIND(infile_bs);
if (ret > 0)
error = NULL;
else if (!error)
error = "unknown error";
break;