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
|
/* Copyright 2007 Roger Dingledine, Nick Mathewson */
/* See LICENSE for licensing information */
/* $Id: /tor/trunk/src/tools/tor-resolve.c 12481 2007-04-21T17:27:19.371353Z nickm $ */
#include "orconfig.h"
#include <stdio.h>
#include <string.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <openssl/objects.h>
#include <openssl/obj_mac.h>
#include <openssl/err.h>
#include <errno.h>
#if 0
#include <stdlib.h>
#include <stdarg.h>
#include <assert.h>
#endif
#define CRYPTO_PRIVATE
#include "../common/compat.h"
#include "../common/util.h"
#include "../common/log.h"
#include "../common/crypto.h"
#define IDENTITY_KEY_BITS 3072
#define SIGNING_KEY_BITS 1024
char *identity_key_file = NULL;
char *signing_key_file = NULL;
char *certificate_file = NULL;
int verbose = 0;
int make_new_id = 0;
EVP_PKEY *identity_key = NULL;
EVP_PKEY *signing_key = NULL;
/* DOCDOC */
static void
show_help(void)
{
fprintf(stderr, "Syntax:\n"
"tor-gencert [-h|--help] [-v] [--create-identity-key] "
"[-i identity_key_file]\n"
" [-s signing_key_file] [-c certificate_file]\n");
}
/* XXXX copied from crypto.c */
static void
crypto_log_errors(int severity, const char *doing)
{
unsigned int err;
const char *msg, *lib, *func;
while ((err = ERR_get_error()) != 0) {
msg = (const char*)ERR_reason_error_string(err);
lib = (const char*)ERR_lib_error_string(err);
func = (const char*)ERR_func_error_string(err);
if (!msg) msg = "(null)";
if (!lib) lib = "(null)";
if (!func) func = "(null)";
if (doing) {
log(severity, LD_CRYPTO, "crypto error while %s: %s (in %s:%s)",
doing, msg, lib, func);
} else {
log(severity, LD_CRYPTO, "crypto error: %s (in %s:%s)", msg, lib, func);
}
}
}
/** DOCDOC */
static int
parse_commandline(int argc, char **argv)
{
int i;
for (i = 1; i < argc; ++i) {
if (!strcmp(argv[i], "--help") || !strcmp(argv[i], "-h")) {
show_help();
return 1;
} else if (!strcmp(argv[i], "-i")) {
if (i+1>=argc) {
fprintf(stderr, "No argument to -i\n");
return 1;
}
identity_key_file = tor_strdup(argv[++i]);
} else if (!strcmp(argv[i], "-c")) {
if (i+1>=argc) {
fprintf(stderr, "No argument to -c\n");
return 1;
}
certificate_file = tor_strdup(argv[++i]);
} else if (!strcmp(argv[i], "-v")) {
verbose = 1;
} else if (!strcmp(argv[i], "--create-identity-key")) {
make_new_id = 1;
} else {
fprintf(stderr, "Unrecognized option %s\n", argv[i]);
return 1;
}
}
if (verbose) {
add_stream_log(LOG_INFO, LOG_ERR, "<stderr>", stderr);
} else {
add_stream_log(LOG_NOTICE, LOG_ERR, "<stderr>", stderr);
}
if (!identity_key_file) {
identity_key_file = tor_strdup("./authority_identity_key");
log_info(LD_GENERAL, "No identity key file given; defaulting to %s",
identity_key_file);
}
if (!signing_key_file) {
signing_key_file = tor_strdup("./authority_signing_key");
log_info(LD_GENERAL, "No signing key file given; defaulting to %s",
signing_key_file);
}
if (!certificate_file) {
certificate_file = tor_strdup("./authority_certificate");
log_info(LD_GENERAL, "No signing key file given; defaulting to %s",
signing_key_file);
}
return 0;
}
/** DOCDOC */
static int
load_identity_key(void)
{
file_status_t status = file_status(identity_key_file);
FILE *f;
if (make_new_id) {
RSA *key;
if (status != FN_NOENT) {
log_err(LD_GENERAL, "--create-identity-key was specified, but %s "
"already exists.", identity_key_file);
return 1;
}
log_notice(LD_GENERAL, "Generating %d-bit RSA identity key.",
IDENTITY_KEY_BITS);
if (!(key = RSA_generate_key(IDENTITY_KEY_BITS, 65537, NULL, NULL))) {
log_err(LD_GENERAL, "Couldn't generate identity key.");
crypto_log_errors(LOG_ERR, "Generating identity key");
return 1;
}
identity_key = EVP_PKEY_new();
if (!(EVP_PKEY_assign_RSA(identity_key, key))) {
log_err(LD_GENERAL, "Couldn't assign identity key.");
return 1;
}
if (!(f = fopen(identity_key_file, "w"))) {
log_err(LD_GENERAL, "Couldn't open %s for writing: %s",
identity_key_file, strerror(errno));
return 1;
}
if (!PEM_write_PKCS8PrivateKey_nid(f, identity_key,
NID_pbe_WithSHA1And3_Key_TripleDES_CBC,
NULL, 0, /* no password here. */
NULL, NULL)) {
log_err(LD_GENERAL, "Couldn't write identity key to %s",
identity_key_file);
crypto_log_errors(LOG_ERR, "Writing identity key");
return 1;
}
fclose(f);
} else {
if (status != FN_FILE) {
log_err(LD_GENERAL,
"No identity key found in %s. To specify a location "
"for an identity key, use -i. To generate a new identity key, "
"use --create-identity-key.", identity_key_file);
return 1;
}
if (!(f = fopen(identity_key_file, "r"))) {
log_err(LD_GENERAL, "Couldn't open %s for reading: %s",
identity_key_file, strerror(errno));
return 1;
}
identity_key = PEM_read_PrivateKey(f, NULL, NULL, NULL);
if (!identity_key) {
log_err(LD_GENERAL, "Couldn't read identity key from %s",
identity_key_file);
return 1;
}
fclose(f);
}
return 0;
}
/** DOCDOC */
static int
generate_signing_key(void)
{
FILE *f;
RSA *key;
log_notice(LD_GENERAL, "Generating %d-bit RSA signing key.",
SIGNING_KEY_BITS);
if (!(key = RSA_generate_key(SIGNING_KEY_BITS, 65537, NULL, NULL))) {
log_err(LD_GENERAL, "Couldn't generate signing key.");
crypto_log_errors(LOG_ERR, "Generating signing key");
return 1;
}
signing_key = EVP_PKEY_new();
if (!(EVP_PKEY_assign_RSA(signing_key, key))) {
log_err(LD_GENERAL, "Couldn't assign signing key.");
return 1;
}
if (!(f = fopen(signing_key_file, "w"))) {
log_err(LD_GENERAL, "Couldn't open %s for reading: %s",
signing_key_file, strerror(errno));
return 1;
}
/* Write signing key with no encryption. */
if (!PEM_write_RSAPrivateKey(f, key, NULL, NULL, 0, NULL, NULL)) {
crypto_log_errors(LOG_WARN, "writing signing key");
return 1;
}
fclose(f);
return 0;
}
static char *
key_to_string(EVP_PKEY *key)
{
BUF_MEM *buf;
BIO *b;
RSA *rsa = EVP_PKEY_get1_RSA(key);
char *result;
if (!rsa)
return NULL;
b = BIO_new(BIO_s_mem());
if (!PEM_write_bio_RSAPublicKey(b, rsa)) {
crypto_log_errors(LOG_WARN, "writing public key to string");
return NULL;
}
BIO_get_mem_ptr(b, &buf);
(void) BIO_set_close(b, BIO_NOCLOSE);
BIO_free(b);
result = tor_malloc(buf->length + 1);
memcpy(result, buf->data, buf->length);
result[buf->length] = 0;
BUF_MEM_free(buf);
return result;
}
static int
get_fingerprint(EVP_PKEY *pkey, char *out)
{
int r = 1;
crypto_pk_env_t *pk = _crypto_new_pk_env_rsa(EVP_PKEY_get1_RSA(pkey));
if (pk) {
r = crypto_pk_get_fingerprint(pk, out, 0);
crypto_free_pk_env(pk);
}
return r;
}
static int
generate_certificate(void)
{
char buf[8192];
time_t now = time(NULL);
char published[ISO_TIME_LEN+1];
char fingerprint[FINGERPRINT_LEN+1];
char *ident = key_to_string(identity_key);
char *signing = key_to_string(signing_key);
FILE *f;
size_t signed_len;
char digest[DIGEST_LEN];
char signature[1024]; /* handles up to 8192-bit keys. */
int r;
get_fingerprint(identity_key, fingerprint);
format_iso_time(published, now);
tor_snprintf(buf, sizeof(buf),
"dir-key-certificate-version 3\n"
"fingerprint %s\n"
"dir-key-published %s\n"
"dir-identity-key\n%s"
"dir-signing-key\n%s"
"dir-key-certification\n",
fingerprint, published, ident, signing);
signed_len = strlen(buf);
SHA1((const unsigned char*)buf,signed_len,(unsigned char*)digest);
r = RSA_private_encrypt(DIGEST_LEN, (unsigned char*)digest,
(unsigned char*)signature,
EVP_PKEY_get1_RSA(identity_key),
RSA_PKCS1_PADDING);
strlcat(buf, "-----BEGIN_SIGNATURE-----\n", sizeof(buf));
signed_len = strlen(buf);
base64_encode(buf+signed_len, sizeof(buf)-signed_len, signature, r);
strlcat(buf, "-----END_SIGNATURE-----\n", sizeof(buf));
if (!(f = fopen(certificate_file, "w"))) {
log_err(LD_GENERAL, "Couldn't open %s for writing: %s",
certificate_file, strerror(errno));
return 1;
}
fputs(buf, f);
fclose(f);
return 0;
}
/** Entry point to tor-gencert */
int
main(int argc, char **argv)
{
int r = 1;
/* Don't bother using acceleration. */
if (crypto_global_init(0)) {
fprintf(stderr, "Couldn't initialize crypto library.\n");
return 1;
}
if (crypto_seed_rng()) {
fprintf(stderr, "Couldn't seed RNG.\n");
goto done;
}
if (parse_commandline(argc, argv))
goto done;
if (load_identity_key())
goto done;
if (generate_signing_key())
goto done;
if (generate_certificate())
goto done;
r = 0;
done:
if (identity_key)
EVP_PKEY_free(identity_key);
if (signing_key)
EVP_PKEY_free(signing_key);
crypto_global_cleanup();
return r;
}
|