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comparison src/event/ngx_event_quic_protection.c @ 7687:69345a26ba69 quic

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Split transport and crypto parts into separate files. New files: src/event/ngx_event_quic_protection.h src/event/ngx_event_quic_protection.c The protection.h header provides interface to the crypto part of the QUIC: 2 functions to initialize corresponding secrets: ngx_quic_set_initial_secret() ngx_quic_set_encryption_secret() and 2 functions to deal with packet processing: ngx_quic_encrypt() ngx_quic_decrypt() Also, structures representing secrets are defined there. All functions require SSL connection and a pool, only crypto operations inside, no access to nginx connections or events. Currently pool->log is used for the logging (instead of original c->log).
author Vladimir Homutov <vl@nginx.com>
date Mon, 16 Mar 2020 19:00:47 +0300
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children ae35ccba7aa6
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7686:7ada2feeac18 7687:69345a26ba69
1
2 /*
3 * Copyright (C) Nginx, Inc.
4 */
5
6
7 #include <ngx_config.h>
8 #include <ngx_core.h>
9 #include <ngx_event.h>
10
11
12 #define NGX_QUIC_IV_LEN 12
13
14 #define NGX_AES_128_GCM_SHA256 0x1301
15 #define NGX_AES_256_GCM_SHA384 0x1302
16 #define NGX_CHACHA20_POLY1305_SHA256 0x1303
17
18
19 #ifdef OPENSSL_IS_BORINGSSL
20 #define ngx_quic_cipher_t EVP_AEAD
21 #else
22 #define ngx_quic_cipher_t EVP_CIPHER
23 #endif
24
25 typedef struct {
26 const ngx_quic_cipher_t *c;
27 const EVP_CIPHER *hp;
28 const EVP_MD *d;
29 } ngx_quic_ciphers_t;
30
31
32 static ngx_int_t ngx_hkdf_expand(u_char *out_key, size_t out_len,
33 const EVP_MD *digest, const u_char *prk, size_t prk_len,
34 const u_char *info, size_t info_len);
35 static ngx_int_t ngx_hkdf_extract(u_char *out_key, size_t *out_len,
36 const EVP_MD *digest, const u_char *secret, size_t secret_len,
37 const u_char *salt, size_t salt_len);
38
39 static uint64_t ngx_quic_parse_pn(u_char **pos, ngx_int_t len, u_char *mask);
40 static ngx_int_t ngx_quic_ciphers(ngx_ssl_conn_t *ssl_conn,
41 ngx_quic_ciphers_t *ciphers, enum ssl_encryption_level_t level);
42
43 static ngx_int_t ngx_quic_tls_open(ngx_pool_t *pool, const ngx_quic_cipher_t *cipher,
44 ngx_quic_secret_t *s, ngx_str_t *out, u_char *nonce, ngx_str_t *in,
45 ngx_str_t *ad);
46 static ngx_int_t ngx_quic_tls_seal(ngx_pool_t *pool,
47 const ngx_quic_cipher_t *cipher, ngx_quic_secret_t *s, ngx_str_t *out,
48 u_char *nonce, ngx_str_t *in, ngx_str_t *ad);
49 static ngx_int_t ngx_quic_tls_hp(ngx_log_t *log, const EVP_CIPHER *cipher,
50 ngx_quic_secret_t *s, u_char *out, u_char *in);
51 static ngx_int_t ngx_quic_hkdf_expand(ngx_pool_t *pool, const EVP_MD *digest,
52 ngx_str_t *out, ngx_str_t *label, const uint8_t *prk, size_t prk_len);
53
54 static ngx_int_t ngx_quic_create_long_packet(ngx_pool_t *pool,
55 ngx_ssl_conn_t *ssl_conn, ngx_quic_header_t *pkt, ngx_str_t *in,
56 ngx_str_t *res);
57
58 static ngx_int_t ngx_quic_create_short_packet(ngx_pool_t *pool,
59 ngx_ssl_conn_t *ssl_conn, ngx_quic_header_t *pkt, ngx_str_t *in,
60 ngx_str_t *res);
61
62
63 static ngx_int_t
64 ngx_quic_ciphers(ngx_ssl_conn_t *ssl_conn, ngx_quic_ciphers_t *ciphers,
65 enum ssl_encryption_level_t level)
66 {
67 ngx_int_t id, len;
68
69 if (level == ssl_encryption_initial) {
70 id = NGX_AES_128_GCM_SHA256;
71
72 } else {
73 id = SSL_CIPHER_get_id(SSL_get_current_cipher(ssl_conn)) & 0xffff;
74 }
75
76 switch (id) {
77
78 case NGX_AES_128_GCM_SHA256:
79 #ifdef OPENSSL_IS_BORINGSSL
80 ciphers->c = EVP_aead_aes_128_gcm();
81 #else
82 ciphers->c = EVP_aes_128_gcm();
83 #endif
84 ciphers->hp = EVP_aes_128_ctr();
85 ciphers->d = EVP_sha256();
86 len = 16;
87 break;
88
89 case NGX_AES_256_GCM_SHA384:
90 #ifdef OPENSSL_IS_BORINGSSL
91 ciphers->c = EVP_aead_aes_256_gcm();
92 #else
93 ciphers->c = EVP_aes_256_gcm();
94 #endif
95 ciphers->hp = EVP_aes_256_ctr();
96 ciphers->d = EVP_sha384();
97 len = 32;
98 break;
99
100 case NGX_CHACHA20_POLY1305_SHA256:
101 #ifdef OPENSSL_IS_BORINGSSL
102 ciphers->c = EVP_aead_chacha20_poly1305();
103 #else
104 ciphers->c = EVP_chacha20_poly1305();
105 #endif
106 #ifdef OPENSSL_IS_BORINGSSL
107 ciphers->hp = (const EVP_CIPHER *) EVP_aead_chacha20_poly1305();
108 #else
109 ciphers->hp = EVP_chacha20();
110 #endif
111 ciphers->d = EVP_sha256();
112 len = 32;
113 break;
114
115 default:
116 return NGX_ERROR;
117 }
118
119 return len;
120 }
121
122
123 ngx_int_t
124 ngx_quic_set_initial_secret(ngx_pool_t *pool, ngx_quic_secrets_t *qsec,
125 ngx_str_t *secret)
126 {
127 size_t is_len;
128 uint8_t is[SHA256_DIGEST_LENGTH];
129 ngx_uint_t i;
130 const EVP_MD *digest;
131 const EVP_CIPHER *cipher;
132
133 static const uint8_t salt[20] =
134 "\xc3\xee\xf7\x12\xc7\x2e\xbb\x5a\x11\xa7"
135 "\xd2\x43\x2b\xb4\x63\x65\xbe\xf9\xf5\x02";
136
137 /* AEAD_AES_128_GCM prior to handshake, quic-tls-23#section-5.3 */
138
139 cipher = EVP_aes_128_gcm();
140 digest = EVP_sha256();
141
142 if (ngx_hkdf_extract(is, &is_len, digest, secret->data, secret->len,
143 salt, sizeof(salt))
144 != NGX_OK)
145 {
146 return NGX_ERROR;
147 }
148
149 ngx_str_t iss = {
150 .data = is,
151 .len = is_len
152 };
153
154 ngx_quic_hexdump0(pool->log, "salt", salt, sizeof(salt));
155 ngx_quic_hexdump0(pool->log, "initial secret", is, is_len);
156
157 /* draft-ietf-quic-tls-23#section-5.2 */
158 qsec->client.in.secret.len = SHA256_DIGEST_LENGTH;
159 qsec->server.in.secret.len = SHA256_DIGEST_LENGTH;
160
161 qsec->client.in.key.len = EVP_CIPHER_key_length(cipher);
162 qsec->server.in.key.len = EVP_CIPHER_key_length(cipher);
163
164 qsec->client.in.hp.len = EVP_CIPHER_key_length(cipher);
165 qsec->server.in.hp.len = EVP_CIPHER_key_length(cipher);
166
167 qsec->client.in.iv.len = EVP_CIPHER_iv_length(cipher);
168 qsec->server.in.iv.len = EVP_CIPHER_iv_length(cipher);
169
170 struct {
171 ngx_str_t label;
172 ngx_str_t *key;
173 ngx_str_t *prk;
174 } seq[] = {
175
176 /* draft-ietf-quic-tls-23#section-5.2 */
177 { ngx_string("tls13 client in"), &qsec->client.in.secret, &iss },
178 {
179 ngx_string("tls13 quic key"),
180 &qsec->client.in.key,
181 &qsec->client.in.secret,
182 },
183 {
184 ngx_string("tls13 quic iv"),
185 &qsec->client.in.iv,
186 &qsec->client.in.secret,
187 },
188 {
189 /* AEAD_AES_128_GCM prior to handshake, quic-tls-23#section-5.4.1 */
190 ngx_string("tls13 quic hp"),
191 &qsec->client.in.hp,
192 &qsec->client.in.secret,
193 },
194 { ngx_string("tls13 server in"), &qsec->server.in.secret, &iss },
195 {
196 /* AEAD_AES_128_GCM prior to handshake, quic-tls-23#section-5.3 */
197 ngx_string("tls13 quic key"),
198 &qsec->server.in.key,
199 &qsec->server.in.secret,
200 },
201 {
202 ngx_string("tls13 quic iv"),
203 &qsec->server.in.iv,
204 &qsec->server.in.secret,
205 },
206 {
207 /* AEAD_AES_128_GCM prior to handshake, quic-tls-23#section-5.4.1 */
208 ngx_string("tls13 quic hp"),
209 &qsec->server.in.hp,
210 &qsec->server.in.secret,
211 },
212
213 };
214
215 for (i = 0; i < (sizeof(seq) / sizeof(seq[0])); i++) {
216
217 if (ngx_quic_hkdf_expand(pool, digest, seq[i].key, &seq[i].label,
218 seq[i].prk->data, seq[i].prk->len)
219 != NGX_OK)
220 {
221 return NGX_ERROR;
222 }
223 }
224
225 return NGX_OK;
226 }
227
228
229 static ngx_int_t
230 ngx_quic_hkdf_expand(ngx_pool_t *pool, const EVP_MD *digest, ngx_str_t *out,
231 ngx_str_t *label, const uint8_t *prk, size_t prk_len)
232 {
233 size_t info_len;
234 uint8_t *p;
235 uint8_t info[20];
236
237 out->data = ngx_pnalloc(pool, out->len);
238 if (out->data == NULL) {
239 return NGX_ERROR;
240 }
241
242 info_len = 2 + 1 + label->len + 1;
243
244 info[0] = 0;
245 info[1] = out->len;
246 info[2] = label->len;
247 p = ngx_cpymem(&info[3], label->data, label->len);
248 *p = '\0';
249
250 if (ngx_hkdf_expand(out->data, out->len, digest,
251 prk, prk_len, info, info_len)
252 != NGX_OK)
253 {
254 ngx_ssl_error(NGX_LOG_INFO, pool->log, 0,
255 "ngx_hkdf_expand(%V) failed", label);
256 return NGX_ERROR;
257 }
258
259 ngx_quic_hexdump(pool->log, "%V info", info, info_len, label);
260 ngx_quic_hexdump(pool->log, "%V key", out->data, out->len, label);
261
262 return NGX_OK;
263 }
264
265
266 static ngx_int_t
267 ngx_hkdf_expand(u_char *out_key, size_t out_len, const EVP_MD *digest,
268 const uint8_t *prk, size_t prk_len, const u_char *info, size_t info_len)
269 {
270 #ifdef OPENSSL_IS_BORINGSSL
271 if (HKDF_expand(out_key, out_len, digest, prk, prk_len, info, info_len)
272 == 0)
273 {
274 return NGX_ERROR;
275 }
276 #else
277
278 EVP_PKEY_CTX *pctx;
279
280 pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_HKDF, NULL);
281
282 if (EVP_PKEY_derive_init(pctx) <= 0) {
283 return NGX_ERROR;
284 }
285
286 if (EVP_PKEY_CTX_hkdf_mode(pctx, EVP_PKEY_HKDEF_MODE_EXPAND_ONLY) <= 0) {
287 return NGX_ERROR;
288 }
289
290 if (EVP_PKEY_CTX_set_hkdf_md(pctx, digest) <= 0) {
291 return NGX_ERROR;
292 }
293
294 if (EVP_PKEY_CTX_set1_hkdf_key(pctx, prk, prk_len) <= 0) {
295 return NGX_ERROR;
296 }
297
298 if (EVP_PKEY_CTX_add1_hkdf_info(pctx, info, info_len) <= 0) {
299 return NGX_ERROR;
300 }
301
302 if (EVP_PKEY_derive(pctx, out_key, &out_len) <= 0) {
303 return NGX_ERROR;
304 }
305
306 #endif
307
308 return NGX_OK;
309 }
310
311
312 static ngx_int_t
313 ngx_hkdf_extract(u_char *out_key, size_t *out_len, const EVP_MD *digest,
314 const u_char *secret, size_t secret_len, const u_char *salt,
315 size_t salt_len)
316 {
317 #ifdef OPENSSL_IS_BORINGSSL
318 if (HKDF_extract(out_key, out_len, digest, secret, secret_len, salt,
319 salt_len)
320 == 0)
321 {
322 return NGX_ERROR;
323 }
324 #else
325
326 EVP_PKEY_CTX *pctx;
327
328 pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_HKDF, NULL);
329
330 if (EVP_PKEY_derive_init(pctx) <= 0) {
331 return NGX_ERROR;
332 }
333
334 if (EVP_PKEY_CTX_hkdf_mode(pctx, EVP_PKEY_HKDEF_MODE_EXTRACT_ONLY) <= 0) {
335 return NGX_ERROR;
336 }
337
338 if (EVP_PKEY_CTX_set_hkdf_md(pctx, digest) <= 0) {
339 return NGX_ERROR;
340 }
341
342 if (EVP_PKEY_CTX_set1_hkdf_key(pctx, secret, secret_len) <= 0) {
343 return NGX_ERROR;
344 }
345
346 if (EVP_PKEY_CTX_set1_hkdf_salt(pctx, salt, salt_len) <= 0) {
347 return NGX_ERROR;
348 }
349
350 if (EVP_PKEY_derive(pctx, out_key, out_len) <= 0) {
351 return NGX_ERROR;
352 }
353
354 #endif
355
356 return NGX_OK;
357 }
358
359
360 static ngx_int_t
361 ngx_quic_tls_open(ngx_pool_t *pool, const ngx_quic_cipher_t *cipher,
362 ngx_quic_secret_t *s, ngx_str_t *out, u_char *nonce, ngx_str_t *in,
363 ngx_str_t *ad)
364 {
365 ngx_log_t *log;
366
367 log = pool->log; // TODO: pass log ?
368
369 out->len = in->len - EVP_GCM_TLS_TAG_LEN;
370 out->data = ngx_pnalloc(pool, out->len);
371 if (out->data == NULL) {
372 return NGX_ERROR;
373 }
374
375 #ifdef OPENSSL_IS_BORINGSSL
376 EVP_AEAD_CTX *ctx;
377
378 ctx = EVP_AEAD_CTX_new(cipher, s->key.data, s->key.len,
379 EVP_AEAD_DEFAULT_TAG_LENGTH);
380 if (ctx == NULL) {
381 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_AEAD_CTX_new() failed");
382 return NGX_ERROR;
383 }
384
385 if (EVP_AEAD_CTX_open(ctx, out->data, &out->len, out->len, nonce, s->iv.len,
386 in->data, in->len, ad->data, ad->len)
387 != 1)
388 {
389 EVP_AEAD_CTX_free(ctx);
390 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_AEAD_CTX_open() failed");
391 return NGX_ERROR;
392 }
393
394 EVP_AEAD_CTX_free(ctx);
395 #else
396 int len;
397 u_char *tag;
398 EVP_CIPHER_CTX *ctx;
399
400 ctx = EVP_CIPHER_CTX_new();
401 if (ctx == NULL) {
402 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_CIPHER_CTX_new() failed");
403 return NGX_ERROR;
404 }
405
406 if (EVP_DecryptInit_ex(ctx, cipher, NULL, NULL, NULL) != 1) {
407 EVP_CIPHER_CTX_free(ctx);
408 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_DecryptInit_ex() failed");
409 return NGX_ERROR;
410 }
411
412 if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, s->iv.len, NULL)
413 == 0)
414 {
415 EVP_CIPHER_CTX_free(ctx);
416 ngx_ssl_error(NGX_LOG_INFO, log, 0,
417 "EVP_CIPHER_CTX_ctrl(EVP_CTRL_GCM_SET_IVLEN) failed");
418 return NGX_ERROR;
419 }
420
421 if (EVP_DecryptInit_ex(ctx, NULL, NULL, s->key.data, nonce) != 1) {
422 EVP_CIPHER_CTX_free(ctx);
423 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_DecryptInit_ex() failed");
424 return NGX_ERROR;
425 }
426
427 if (EVP_DecryptUpdate(ctx, NULL, &len, ad->data, ad->len) != 1) {
428 EVP_CIPHER_CTX_free(ctx);
429 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_DecryptUpdate() failed");
430 return NGX_ERROR;
431 }
432
433 if (EVP_DecryptUpdate(ctx, out->data, &len, in->data,
434 in->len - EVP_GCM_TLS_TAG_LEN)
435 != 1)
436 {
437 EVP_CIPHER_CTX_free(ctx);
438 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_DecryptUpdate() failed");
439 return NGX_ERROR;
440 }
441
442 out->len = len;
443 tag = in->data + in->len - EVP_GCM_TLS_TAG_LEN;
444
445 if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, EVP_GCM_TLS_TAG_LEN, tag)
446 == 0)
447 {
448 EVP_CIPHER_CTX_free(ctx);
449 ngx_ssl_error(NGX_LOG_INFO, log, 0,
450 "EVP_CIPHER_CTX_ctrl(EVP_CTRL_GCM_SET_TAG) failed");
451 return NGX_ERROR;
452 }
453
454 if (EVP_DecryptFinal_ex(ctx, out->data + len, &len) <= 0) {
455 EVP_CIPHER_CTX_free(ctx);
456 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_DecryptFinal_ex failed");
457 return NGX_ERROR;
458 }
459
460 out->len += len;
461
462 EVP_CIPHER_CTX_free(ctx);
463 #endif
464
465 return NGX_OK;
466 }
467
468
469 static ngx_int_t
470 ngx_quic_tls_seal(ngx_pool_t *pool, const ngx_quic_cipher_t *cipher,
471 ngx_quic_secret_t *s, ngx_str_t *out, u_char *nonce, ngx_str_t *in,
472 ngx_str_t *ad)
473 {
474 ngx_log_t *log;
475
476 log = pool->log; // TODO: pass log ?
477
478 out->len = in->len + EVP_GCM_TLS_TAG_LEN;
479 out->data = ngx_pnalloc(pool, out->len);
480 if (out->data == NULL) {
481 return NGX_ERROR;
482 }
483
484 #ifdef OPENSSL_IS_BORINGSSL
485 EVP_AEAD_CTX *ctx;
486
487 ctx = EVP_AEAD_CTX_new(cipher, s->key.data, s->key.len,
488 EVP_AEAD_DEFAULT_TAG_LENGTH);
489 if (ctx == NULL) {
490 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_AEAD_CTX_new() failed");
491 return NGX_ERROR;
492 }
493
494 if (EVP_AEAD_CTX_seal(ctx, out->data, &out->len, out->len, nonce, s->iv.len,
495 in->data, in->len, ad->data, ad->len)
496 != 1)
497 {
498 EVP_AEAD_CTX_free(ctx);
499 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_AEAD_CTX_seal() failed");
500 return NGX_ERROR;
501 }
502
503 EVP_AEAD_CTX_free(ctx);
504 #else
505 int len;
506 EVP_CIPHER_CTX *ctx;
507
508 ctx = EVP_CIPHER_CTX_new();
509 if (ctx == NULL) {
510 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_CIPHER_CTX_new() failed");
511 return NGX_ERROR;
512 }
513
514 if (EVP_EncryptInit_ex(ctx, cipher, NULL, NULL, NULL) != 1) {
515 EVP_CIPHER_CTX_free(ctx);
516 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_EncryptInit_ex() failed");
517 return NGX_ERROR;
518 }
519
520 if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, s->iv.len, NULL)
521 == 0)
522 {
523 EVP_CIPHER_CTX_free(ctx);
524 ngx_ssl_error(NGX_LOG_INFO, log, 0,
525 "EVP_CIPHER_CTX_ctrl(EVP_CTRL_GCM_SET_IVLEN) failed");
526 return NGX_ERROR;
527 }
528
529 if (EVP_EncryptInit_ex(ctx, NULL, NULL, s->key.data, nonce) != 1) {
530 EVP_CIPHER_CTX_free(ctx);
531 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_EncryptInit_ex() failed");
532 return NGX_ERROR;
533 }
534
535 if (EVP_EncryptUpdate(ctx, NULL, &len, ad->data, ad->len) != 1) {
536 EVP_CIPHER_CTX_free(ctx);
537 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_EncryptUpdate() failed");
538 return NGX_ERROR;
539 }
540
541 if (EVP_EncryptUpdate(ctx, out->data, &len, in->data, in->len) != 1) {
542 EVP_CIPHER_CTX_free(ctx);
543 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_EncryptUpdate() failed");
544 return NGX_ERROR;
545 }
546
547 out->len = len;
548
549 if (EVP_EncryptFinal_ex(ctx, out->data + out->len, &len) <= 0) {
550 EVP_CIPHER_CTX_free(ctx);
551 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_EncryptFinal_ex failed");
552 return NGX_ERROR;
553 }
554
555 out->len += len;
556
557 if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_GET_TAG, EVP_GCM_TLS_TAG_LEN,
558 out->data + in->len)
559 == 0)
560 {
561 EVP_CIPHER_CTX_free(ctx);
562 ngx_ssl_error(NGX_LOG_INFO, log, 0,
563 "EVP_CIPHER_CTX_ctrl(EVP_CTRL_GCM_GET_TAG) failed");
564 return NGX_ERROR;
565 }
566
567 EVP_CIPHER_CTX_free(ctx);
568
569 out->len += EVP_GCM_TLS_TAG_LEN;
570 #endif
571 return NGX_OK;
572 }
573
574
575 static ngx_int_t
576 ngx_quic_tls_hp(ngx_log_t *log, const EVP_CIPHER *cipher,
577 ngx_quic_secret_t *s, u_char *out, u_char *in)
578 {
579 int outlen;
580 EVP_CIPHER_CTX *ctx;
581 u_char zero[5] = {0};
582
583 #ifdef OPENSSL_IS_BORINGSSL
584 uint32_t counter;
585
586 ngx_memcpy(&counter, in, sizeof(uint32_t));
587
588 if (cipher == (const EVP_CIPHER *) EVP_aead_chacha20_poly1305()) {
589 CRYPTO_chacha_20(out, zero, 5, s->hp.data, &in[4], counter);
590 return NGX_OK;
591 }
592 #endif
593
594 ctx = EVP_CIPHER_CTX_new();
595 if (ctx == NULL) {
596 return NGX_ERROR;
597 }
598
599 if (EVP_EncryptInit_ex(ctx, cipher, NULL, s->hp.data, in) != 1) {
600 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_EncryptInit_ex() failed");
601 goto failed;
602 }
603
604 if (!EVP_EncryptUpdate(ctx, out, &outlen, zero, 5)) {
605 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_EncryptUpdate() failed");
606 goto failed;
607 }
608
609 if (!EVP_EncryptFinal_ex(ctx, out + 5, &outlen)) {
610 ngx_ssl_error(NGX_LOG_INFO, log, 0, "EVP_EncryptFinal_Ex() failed");
611 goto failed;
612 }
613
614 EVP_CIPHER_CTX_free(ctx);
615
616 return NGX_OK;
617
618 failed:
619
620 EVP_CIPHER_CTX_free(ctx);
621
622 return NGX_ERROR;
623 }
624
625
626 int
627 ngx_quic_set_encryption_secret(ngx_pool_t *pool, ngx_ssl_conn_t *ssl_conn,
628 enum ssl_encryption_level_t level, const uint8_t *secret,
629 size_t secret_len, ngx_quic_peer_secrets_t *qsec)
630 {
631 ngx_int_t key_len;
632 ngx_uint_t i;
633 ngx_quic_secret_t *peer_secret;
634 ngx_quic_ciphers_t ciphers;
635
636 key_len = ngx_quic_ciphers(ssl_conn, &ciphers, level);
637
638 if (key_len == NGX_ERROR) {
639 ngx_ssl_error(NGX_LOG_INFO, pool->log, 0, "unexpected cipher");
640 return 0;
641 }
642
643 switch (level) {
644
645 case ssl_encryption_handshake:
646 peer_secret= &qsec->hs;
647 break;
648
649 case ssl_encryption_application:
650 peer_secret = &qsec->ad;
651 break;
652
653 default:
654 return 0;
655 }
656
657 peer_secret->key.len = key_len;
658 peer_secret->iv.len = NGX_QUIC_IV_LEN;
659 peer_secret->hp.len = key_len;
660
661 struct {
662 ngx_str_t label;
663 ngx_str_t *key;
664 const uint8_t *secret;
665 } seq[] = {
666 { ngx_string("tls13 quic key"), &peer_secret->key, secret },
667 { ngx_string("tls13 quic iv"), &peer_secret->iv, secret },
668 { ngx_string("tls13 quic hp"), &peer_secret->hp, secret },
669 };
670
671 for (i = 0; i < (sizeof(seq) / sizeof(seq[0])); i++) {
672
673 if (ngx_quic_hkdf_expand(pool, ciphers.d, seq[i].key, &seq[i].label,
674 seq[i].secret, secret_len)
675 != NGX_OK)
676 {
677 return 0;
678 }
679 }
680
681 return 1;
682 }
683
684
685 static ngx_int_t
686 ngx_quic_create_long_packet(ngx_pool_t *pool, ngx_ssl_conn_t *ssl_conn,
687 ngx_quic_header_t *pkt, ngx_str_t *payload, ngx_str_t *res)
688 {
689 u_char *p, *pnp, *nonce, *sample, *packet;
690 uint64_t pn;
691 ngx_log_t *log;
692 ngx_str_t ad, out;
693 ngx_quic_ciphers_t ciphers;
694 u_char mask[16];
695
696 log = pool->log;
697
698 out.len = payload->len + EVP_GCM_TLS_TAG_LEN;
699
700 ad.data = ngx_alloc(346 /*max header*/, log);
701 if (ad.data == 0) {
702 return NGX_ERROR;
703 }
704
705 p = ad.data;
706
707 *p++ = pkt->flags;
708
709 p = ngx_quic_write_uint32(p, quic_version);
710
711 *p++ = pkt->scid.len;
712 p = ngx_cpymem(p, pkt->scid.data, pkt->scid.len);
713
714 *p++ = pkt->dcid.len;
715 p = ngx_cpymem(p, pkt->dcid.data, pkt->dcid.len);
716
717 if (pkt->level == ssl_encryption_initial) {
718 ngx_quic_build_int(&p, pkt->token.len);
719 }
720
721 ngx_quic_build_int(&p, out.len + 1); // length (inc. pnl)
722 pnp = p;
723
724 pn = *pkt->number;
725
726 *p++ = pn;
727
728 ad.len = p - ad.data;
729
730 ngx_quic_hexdump0(log, "ad", ad.data, ad.len);
731
732 if (ngx_quic_ciphers(ssl_conn, &ciphers, pkt->level) == NGX_ERROR) {
733 return NGX_ERROR;
734 }
735
736 nonce = ngx_pstrdup(pool, &pkt->secret->iv);
737 if (pkt->level == ssl_encryption_handshake) {
738 nonce[11] ^= pn;
739 }
740
741 ngx_quic_hexdump0(log, "server_iv", pkt->secret->iv.data, 12);
742 ngx_quic_hexdump0(log, "nonce", nonce, 12);
743
744 if (ngx_quic_tls_seal(pool, ciphers.c, pkt->secret, &out,
745 nonce, payload, &ad)
746 != NGX_OK)
747 {
748 return NGX_ERROR;
749 }
750
751 sample = &out.data[3]; // pnl=0
752 if (ngx_quic_tls_hp(log, ciphers.hp, pkt->secret, mask, sample) != NGX_OK) {
753 return NGX_ERROR;
754 }
755
756 ngx_quic_hexdump0(log, "sample", sample, 16);
757 ngx_quic_hexdump0(log, "mask", mask, 16);
758 ngx_quic_hexdump0(log, "hp_key", pkt->secret->hp.data, 16);
759
760 // header protection, pnl = 0
761 ad.data[0] ^= mask[0] & 0x0f;
762 *pnp ^= mask[1];
763
764 packet = ngx_alloc(ad.len + out.len, log);
765 if (packet == 0) {
766 return NGX_ERROR;
767 }
768
769 p = ngx_cpymem(packet, ad.data, ad.len);
770 p = ngx_cpymem(p, out.data, out.len);
771
772 res->data = packet;
773 res->len = p - packet;
774
775 return NGX_OK;
776 }
777
778
779 static ngx_int_t
780 ngx_quic_create_short_packet(ngx_pool_t *pool, ngx_ssl_conn_t *ssl_conn,
781 ngx_quic_header_t *pkt, ngx_str_t *payload, ngx_str_t *res)
782 {
783 u_char *p, *pnp, *nonce, *sample, *packet;
784 ngx_log_t *log;
785 ngx_str_t ad, out;
786 ngx_quic_ciphers_t ciphers;
787 u_char mask[16];
788
789 log = pool->log;
790
791 out.len = payload->len + EVP_GCM_TLS_TAG_LEN;
792
793 ad.data = ngx_alloc(25 /*max header*/, log);
794 if (ad.data == 0) {
795 return NGX_ERROR;
796 }
797
798 p = ad.data;
799
800 *p++ = 0x40;
801
802 p = ngx_cpymem(p, pkt->scid.data, pkt->scid.len);
803
804 pnp = p;
805
806 *p++ = (*pkt->number);
807
808 ad.len = p - ad.data;
809
810 ngx_quic_hexdump0(log, "ad", ad.data, ad.len);
811
812 if (ngx_quic_ciphers(ssl_conn, &ciphers, pkt->level) == NGX_ERROR) {
813 return NGX_ERROR;
814 }
815
816 nonce = ngx_pstrdup(pool, &pkt->secret->iv);
817 if (pkt->level == ssl_encryption_handshake
818 || pkt->level == ssl_encryption_application)
819 {
820 nonce[11] ^= *pkt->number;
821 }
822
823 ngx_quic_hexdump0(log, "server_iv", pkt->secret->iv.data, 12);
824 ngx_quic_hexdump0(log, "nonce", nonce, 12);
825
826 if (ngx_quic_tls_seal(pool, ciphers.c, pkt->secret, &out,
827 nonce, payload, &ad)
828 != NGX_OK)
829 {
830 return NGX_ERROR;
831 }
832
833 ngx_quic_hexdump0(log, "out", out.data, out.len);
834
835 sample = &out.data[3]; // pnl=0
836 if (ngx_quic_tls_hp(log, ciphers.hp, pkt->secret, mask, sample) != NGX_OK) {
837 return NGX_ERROR;
838 }
839
840 ngx_quic_hexdump0(log, "sample", sample, 16);
841 ngx_quic_hexdump0(log, "mask", mask, 16);
842 ngx_quic_hexdump0(log, "hp_key", pkt->secret->hp.data, 16);
843
844 // header protection, pnl = 0
845 ad.data[0] ^= mask[0] & 0x1f;
846 *pnp ^= mask[1];
847
848 packet = ngx_alloc(ad.len + out.len, log);
849 if (packet == 0) {
850 return NGX_ERROR;
851 }
852
853 p = ngx_cpymem(packet, ad.data, ad.len);
854 p = ngx_cpymem(p, out.data, out.len);
855
856 ngx_quic_hexdump0(log, "packet", packet, p - packet);
857
858 res->data = packet;
859 res->len = p - packet;
860
861 return NGX_OK;
862 }
863
864 static uint64_t
865 ngx_quic_parse_pn(u_char **pos, ngx_int_t len, u_char *mask)
866 {
867 u_char *p;
868 uint64_t value;
869
870 p = *pos;
871 value = *p++ ^ *mask++;
872
873 while (--len) {
874 value = (value << 8) + (*p++ ^ *mask++);
875 }
876
877 *pos = p;
878 return value;
879 }
880
881
882 ngx_int_t
883 ngx_quic_encrypt(ngx_pool_t *pool, ngx_ssl_conn_t *ssl_conn,
884 ngx_quic_header_t *pkt, ngx_str_t *payload, ngx_str_t *res)
885 {
886 if (pkt->level == ssl_encryption_application) {
887 return ngx_quic_create_short_packet(pool, ssl_conn, pkt, payload, res);
888 }
889
890 return ngx_quic_create_long_packet(pool, ssl_conn, pkt, payload, res);
891 }
892
893
894 ngx_int_t
895 ngx_quic_decrypt(ngx_pool_t *pool, ngx_ssl_conn_t *ssl_conn,
896 ngx_quic_header_t *pkt)
897 {
898 u_char clearflags, *p, *sample;
899 uint8_t *nonce;
900 uint64_t pn;
901 ngx_log_t *log;
902 ngx_int_t pnl, rc;
903 ngx_str_t in, ad;
904 ngx_quic_ciphers_t ciphers;
905 uint8_t mask[16];
906
907 log = pool->log;
908
909 if (ngx_quic_ciphers(ssl_conn, &ciphers, pkt->level) == NGX_ERROR) {
910 return NGX_ERROR;
911 }
912
913 p = pkt->raw->pos;
914
915 /* draft-ietf-quic-tls-23#section-5.4.2:
916 * the Packet Number field is assumed to be 4 bytes long
917 * draft-ietf-quic-tls-23#section-5.4.[34]:
918 * AES-Based and ChaCha20-Based header protections sample 16 bytes
919 */
920
921 sample = p + 4;
922
923 ngx_quic_hexdump0(log, "sample", sample, 16);
924
925 /* header protection */
926
927 if (ngx_quic_tls_hp(log, ciphers.hp, pkt->secret, mask, sample) != NGX_OK) {
928 return NGX_ERROR;
929 }
930
931 if (pkt->flags & NGX_QUIC_PKT_LONG) {
932 clearflags = pkt->flags ^ (mask[0] & 0x0f);
933
934 } else {
935 clearflags = pkt->flags ^ (mask[0] & 0x1f);
936 }
937
938 pnl = (clearflags & 0x03) + 1;
939 pn = ngx_quic_parse_pn(&p, pnl, &mask[1]);
940
941 pkt->pn = pn;
942
943 ngx_quic_hexdump0(log, "mask", mask, 5);
944 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, log, 0,
945 "quic clear flags: %xi", clearflags);
946 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, log, 0,
947 "quic packet number: %uL, len: %xi", pn, pnl);
948
949 /* packet protection */
950
951 in.data = p;
952
953 if (pkt->flags & NGX_QUIC_PKT_LONG) {
954 in.len = pkt->len - pnl;
955
956 } else {
957 in.len = pkt->data + pkt->len - p;
958 }
959
960 ad.len = p - pkt->data;
961 ad.data = ngx_pnalloc(pool, ad.len);
962 if (ad.data == NULL) {
963 return NGX_ERROR;
964 }
965
966 ngx_memcpy(ad.data, pkt->data, ad.len);
967 ad.data[0] = clearflags;
968
969 do {
970 ad.data[ad.len - pnl] = pn >> (8 * (pnl - 1)) % 256;
971 } while (--pnl);
972
973 nonce = ngx_pstrdup(pool, &pkt->secret->iv);
974 nonce[11] ^= pn;
975
976 ngx_quic_hexdump0(log, "nonce", nonce, 12);
977 ngx_quic_hexdump0(log, "ad", ad.data, ad.len);
978
979 rc = ngx_quic_tls_open(pool, ciphers.c, pkt->secret, &pkt->payload,
980 nonce, &in, &ad);
981
982 ngx_quic_hexdump0(log, "packet payload",
983 pkt->payload.data, pkt->payload.len);
984
985 return rc;
986 }
987