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440e5d80 RS |
1 | /* |
2 | * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved. | |
7f458a48 | 3 | * |
440e5d80 RS |
4 | * Licensed under the OpenSSL license (the "License"). You may not use |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
7f458a48 | 8 | */ |
9 | ||
10 | /* Required for vmsplice */ | |
11 | #define _GNU_SOURCE | |
12 | #include <stdio.h> | |
13 | #include <string.h> | |
14 | #include <unistd.h> | |
15 | ||
16 | #include <openssl/engine.h> | |
17 | #include <openssl/async.h> | |
6bf73e53 | 18 | #include <openssl/err.h> |
7f458a48 | 19 | |
20 | #include <linux/version.h> | |
21 | #define K_MAJ 4 | |
22 | #define K_MIN1 1 | |
23 | #define K_MIN2 0 | |
24 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(K_MAJ, K_MIN1, K_MIN2) | |
25 | # warning "AFALG ENGINE requires Kernel Headers >= 4.1.0" | |
26 | # warning "Skipping Compilation of AFALG engine" | |
627537dd MC |
27 | void engine_load_afalg_int(void) |
28 | { | |
29 | } | |
7f458a48 | 30 | #else |
31 | ||
32 | # include <linux/if_alg.h> | |
33 | # include <sys/socket.h> | |
34 | # include <fcntl.h> | |
35 | # include <sys/utsname.h> | |
36 | ||
37 | # include <linux/aio_abi.h> | |
38 | # include <sys/syscall.h> | |
39 | # include <errno.h> | |
40 | ||
41 | # include "e_afalg.h" | |
42 | ||
43 | # define AFALG_LIB_NAME "AFALG" | |
44 | # include "e_afalg_err.h" | |
45 | ||
46 | # ifndef SOL_ALG | |
47 | # define SOL_ALG 279 | |
48 | # endif | |
49 | ||
50 | # ifdef ALG_ZERO_COPY | |
51 | # ifndef SPLICE_F_GIFT | |
52 | # define SPLICE_F_GIFT (0x08) | |
53 | # endif | |
54 | # endif | |
55 | ||
56 | # define ALG_AES_IV_LEN 16 | |
57 | # define ALG_IV_LEN(len) (sizeof(struct af_alg_iv) + (len)) | |
58 | # define ALG_OP_TYPE unsigned int | |
59 | # define ALG_OP_LEN (sizeof(ALG_OP_TYPE)) | |
60 | ||
6cba4a66 | 61 | #define ALG_MAX_SALG_NAME 64 |
62 | #define ALG_MAX_SALG_TYPE 14 | |
63 | ||
64 | # ifdef OPENSSL_NO_DYNAMIC_ENGINE | |
b3599dbb | 65 | void engine_load_afalg_int(void); |
6cba4a66 | 66 | # endif |
67 | ||
7f458a48 | 68 | /* Local Linkage Functions */ |
69 | static int afalg_init_aio(afalg_aio *aio); | |
70 | static int afalg_fin_cipher_aio(afalg_aio *ptr, int sfd, | |
71 | unsigned char *buf, size_t len); | |
6cba4a66 | 72 | static int afalg_create_sk(afalg_ctx *actx, const char *ciphertype, |
73 | const char *ciphername); | |
7f458a48 | 74 | static int afalg_destroy(ENGINE *e); |
75 | static int afalg_init(ENGINE *e); | |
76 | static int afalg_finish(ENGINE *e); | |
77 | const EVP_CIPHER *afalg_aes_128_cbc(void); | |
78 | static int afalg_ciphers(ENGINE *e, const EVP_CIPHER **cipher, | |
79 | const int **nids, int nid); | |
80 | static int afalg_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, | |
81 | const unsigned char *iv, int enc); | |
82 | static int afalg_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, | |
83 | const unsigned char *in, size_t inl); | |
84 | static int afalg_cipher_cleanup(EVP_CIPHER_CTX *ctx); | |
85 | static int afalg_chk_platform(void); | |
86 | ||
87 | /* Engine Id and Name */ | |
88 | static const char *engine_afalg_id = "afalg"; | |
538dbbc6 | 89 | static const char *engine_afalg_name = "AFALG engine support"; |
7f458a48 | 90 | |
a1933888 | 91 | static int afalg_cipher_nids[] = { |
7f458a48 | 92 | NID_aes_128_cbc |
93 | }; | |
94 | ||
95 | static EVP_CIPHER *_hidden_aes_128_cbc = NULL; | |
96 | ||
2a7de0fd | 97 | static ossl_inline int io_setup(unsigned n, aio_context_t *ctx) |
7f458a48 | 98 | { |
99 | return syscall(__NR_io_setup, n, ctx); | |
100 | } | |
101 | ||
2a7de0fd | 102 | static ossl_inline int eventfd(int n) |
7f458a48 | 103 | { |
104 | return syscall(__NR_eventfd, n); | |
105 | } | |
106 | ||
2a7de0fd | 107 | static ossl_inline int io_destroy(aio_context_t ctx) |
7f458a48 | 108 | { |
109 | return syscall(__NR_io_destroy, ctx); | |
110 | } | |
111 | ||
2a7de0fd | 112 | static ossl_inline int io_read(aio_context_t ctx, long n, struct iocb **iocb) |
7f458a48 | 113 | { |
114 | return syscall(__NR_io_submit, ctx, n, iocb); | |
115 | } | |
116 | ||
2a7de0fd | 117 | static ossl_inline int io_getevents(aio_context_t ctx, long min, long max, |
7f458a48 | 118 | struct io_event *events, |
119 | struct timespec *timeout) | |
120 | { | |
121 | return syscall(__NR_io_getevents, ctx, min, max, events, timeout); | |
122 | } | |
123 | ||
124 | static void afalg_waitfd_cleanup(ASYNC_WAIT_CTX *ctx, const void *key, | |
125 | OSSL_ASYNC_FD waitfd, void *custom) | |
126 | { | |
127 | close(waitfd); | |
128 | } | |
129 | ||
130 | static int afalg_setup_async_event_notification(afalg_aio *aio) | |
131 | { | |
132 | ASYNC_JOB *job; | |
133 | ASYNC_WAIT_CTX *waitctx; | |
134 | void *custom = NULL; | |
6cba4a66 | 135 | int ret; |
7f458a48 | 136 | |
137 | if ((job = ASYNC_get_current_job()) != NULL) { | |
138 | /* Async mode */ | |
139 | waitctx = ASYNC_get_wait_ctx(job); | |
140 | if (waitctx == NULL) { | |
141 | ALG_WARN("%s: ASYNC_get_wait_ctx error", __func__); | |
142 | return 0; | |
143 | } | |
144 | /* Get waitfd from ASYNC_WAIT_CTX if it is alreday set */ | |
6cba4a66 | 145 | ret = ASYNC_WAIT_CTX_get_fd(waitctx, engine_afalg_id, |
146 | &aio->efd, &custom); | |
147 | if (ret == 0) { | |
148 | /* | |
149 | * waitfd is not set in ASYNC_WAIT_CTX, create a new one | |
150 | * and set it. efd will be signaled when AIO operation completes | |
151 | */ | |
152 | aio->efd = eventfd(0); | |
153 | if (aio->efd == -1) { | |
7f458a48 | 154 | ALG_PERR("%s: Failed to get eventfd : ", __func__); |
155 | AFALGerr(AFALG_F_AFALG_SETUP_ASYNC_EVENT_NOTIFICATION, | |
156 | AFALG_R_EVENTFD_FAILED); | |
157 | return 0; | |
158 | } | |
6cba4a66 | 159 | ret = ASYNC_WAIT_CTX_set_wait_fd(waitctx, engine_afalg_id, |
160 | aio->efd, custom, | |
161 | afalg_waitfd_cleanup); | |
162 | if (ret == 0) { | |
7f458a48 | 163 | ALG_WARN("%s: Failed to set wait fd", __func__); |
6cba4a66 | 164 | close(aio->efd); |
7f458a48 | 165 | return 0; |
166 | } | |
167 | /* make fd non-blocking in async mode */ | |
6cba4a66 | 168 | if (fcntl(aio->efd, F_SETFL, O_NONBLOCK) != 0) { |
7f458a48 | 169 | ALG_WARN("%s: Failed to set event fd as NONBLOCKING", |
170 | __func__); | |
171 | } | |
172 | } | |
6cba4a66 | 173 | aio->mode = MODE_ASYNC; |
7f458a48 | 174 | } else { |
175 | /* Sync mode */ | |
6cba4a66 | 176 | aio->efd = eventfd(0); |
177 | if (aio->efd == -1) { | |
7f458a48 | 178 | ALG_PERR("%s: Failed to get eventfd : ", __func__); |
179 | AFALGerr(AFALG_F_AFALG_SETUP_ASYNC_EVENT_NOTIFICATION, | |
180 | AFALG_R_EVENTFD_FAILED); | |
181 | return 0; | |
182 | } | |
6cba4a66 | 183 | aio->mode = MODE_SYNC; |
7f458a48 | 184 | } |
185 | return 1; | |
186 | } | |
187 | ||
188 | int afalg_init_aio(afalg_aio *aio) | |
189 | { | |
190 | int r = -1; | |
191 | ||
192 | /* Initialise for AIO */ | |
193 | aio->aio_ctx = 0; | |
194 | r = io_setup(MAX_INFLIGHTS, &aio->aio_ctx); | |
195 | if (r < 0) { | |
196 | ALG_PERR("%s: io_setup error : ", __func__); | |
197 | AFALGerr(AFALG_F_AFALG_INIT_AIO, AFALG_R_IO_SETUP_FAILED); | |
198 | return 0; | |
199 | } | |
200 | ||
201 | memset(aio->cbt, 0, sizeof(aio->cbt)); | |
7f458a48 | 202 | aio->efd = -1; |
6cba4a66 | 203 | aio->mode = MODE_UNINIT; |
7f458a48 | 204 | |
205 | return 1; | |
206 | } | |
207 | ||
208 | int afalg_fin_cipher_aio(afalg_aio *aio, int sfd, unsigned char *buf, | |
209 | size_t len) | |
210 | { | |
211 | int r; | |
212 | int retry = 0; | |
213 | unsigned int done = 0; | |
214 | struct iocb *cb; | |
215 | struct timespec timeout; | |
216 | struct io_event events[MAX_INFLIGHTS]; | |
217 | u_int64_t eval = 0; | |
218 | ||
219 | timeout.tv_sec = 0; | |
220 | timeout.tv_nsec = 0; | |
221 | ||
222 | /* if efd has not been initialised yet do it here */ | |
6cba4a66 | 223 | if (aio->mode == MODE_UNINIT) { |
7f458a48 | 224 | r = afalg_setup_async_event_notification(aio); |
225 | if (r == 0) | |
226 | return 0; | |
227 | } | |
228 | ||
229 | cb = &(aio->cbt[0 % MAX_INFLIGHTS]); | |
230 | memset(cb, '\0', sizeof(*cb)); | |
231 | cb->aio_fildes = sfd; | |
232 | cb->aio_lio_opcode = IOCB_CMD_PREAD; | |
2a7de0fd | 233 | cb->aio_buf = (uint64_t)buf; |
7f458a48 | 234 | cb->aio_offset = 0; |
235 | cb->aio_data = 0; | |
236 | cb->aio_nbytes = len; | |
237 | cb->aio_flags = IOCB_FLAG_RESFD; | |
238 | cb->aio_resfd = aio->efd; | |
239 | ||
240 | /* | |
241 | * Perform AIO read on AFALG socket, this in turn performs an async | |
242 | * crypto operation in kernel space | |
243 | */ | |
244 | r = io_read(aio->aio_ctx, 1, &cb); | |
245 | if (r < 0) { | |
6cba4a66 | 246 | ALG_PWARN("%s: io_read failed : ", __func__); |
7f458a48 | 247 | return 0; |
248 | } | |
249 | ||
250 | do { | |
251 | /* While AIO read is being performed pause job */ | |
252 | ASYNC_pause_job(); | |
253 | ||
254 | /* Check for completion of AIO read */ | |
255 | r = read(aio->efd, &eval, sizeof(eval)); | |
256 | if (r < 0) { | |
257 | if (errno == EAGAIN || errno == EWOULDBLOCK) | |
258 | continue; | |
259 | ALG_PERR("%s: read failed for event fd : ", __func__); | |
260 | return 0; | |
261 | } else if (r == 0 || eval <= 0) { | |
262 | ALG_WARN("%s: eventfd read %d bytes, eval = %lu\n", __func__, r, | |
263 | eval); | |
264 | } | |
265 | if (eval > 0) { | |
266 | ||
267 | /* Get results of AIO read */ | |
6cba4a66 | 268 | r = io_getevents(aio->aio_ctx, 1, MAX_INFLIGHTS, |
269 | events, &timeout); | |
7f458a48 | 270 | if (r > 0) { |
271 | /* | |
272 | * events.res indicates the actual status of the operation. | |
273 | * Handle the error condition first. | |
274 | */ | |
275 | if (events[0].res < 0) { | |
276 | /* | |
277 | * Underlying operation cannot be completed at the time | |
278 | * of previous submission. Resubmit for the operation. | |
279 | */ | |
280 | if (events[0].res == -EBUSY && retry++ < 3) { | |
281 | r = io_read(aio->aio_ctx, 1, &cb); | |
282 | if (r < 0) { | |
283 | ALG_PERR("%s: retry %d for io_read failed : ", | |
284 | __func__, retry); | |
285 | return 0; | |
286 | } | |
287 | continue; | |
288 | } else { | |
289 | /* | |
290 | * Retries exceed for -EBUSY or unrecoverable error | |
291 | * condition for this instance of operation. | |
292 | */ | |
293 | ALG_WARN | |
294 | ("%s: Crypto Operation failed with code %lld\n", | |
295 | __func__, events[0].res); | |
296 | return 0; | |
297 | } | |
298 | } | |
299 | /* Operation successful. */ | |
300 | done = 1; | |
301 | } else if (r < 0) { | |
302 | ALG_PERR("%s: io_getevents failed : ", __func__); | |
303 | return 0; | |
304 | } else { | |
305 | ALG_WARN("%s: io_geteventd read 0 bytes\n", __func__); | |
306 | } | |
307 | } | |
308 | } while (!done); | |
309 | ||
310 | return 1; | |
311 | } | |
312 | ||
2a7de0fd | 313 | static ossl_inline void afalg_set_op_sk(struct cmsghdr *cmsg, |
7f458a48 | 314 | const unsigned int op) |
315 | { | |
316 | cmsg->cmsg_level = SOL_ALG; | |
317 | cmsg->cmsg_type = ALG_SET_OP; | |
318 | cmsg->cmsg_len = CMSG_LEN(ALG_OP_LEN); | |
319 | *CMSG_DATA(cmsg) = (char)op; | |
320 | } | |
321 | ||
322 | static void afalg_set_iv_sk(struct cmsghdr *cmsg, const unsigned char *iv, | |
323 | const unsigned int len) | |
324 | { | |
325 | struct af_alg_iv *aiv; | |
326 | ||
327 | cmsg->cmsg_level = SOL_ALG; | |
328 | cmsg->cmsg_type = ALG_SET_IV; | |
329 | cmsg->cmsg_len = CMSG_LEN(ALG_IV_LEN(len)); | |
330 | aiv = (struct af_alg_iv *)CMSG_DATA(cmsg); | |
331 | aiv->ivlen = len; | |
332 | memcpy(aiv->iv, iv, len); | |
333 | } | |
334 | ||
2a7de0fd | 335 | static ossl_inline int afalg_set_key(afalg_ctx *actx, const unsigned char *key, |
6cba4a66 | 336 | const int klen) |
7f458a48 | 337 | { |
338 | int ret; | |
6cba4a66 | 339 | ret = setsockopt(actx->bfd, SOL_ALG, ALG_SET_KEY, key, klen); |
340 | if (ret < 0) { | |
341 | ALG_PERR("%s: Failed to set socket option : ", __func__); | |
342 | AFALGerr(AFALG_F_AFALG_SET_KEY, AFALG_R_SOCKET_SET_KEY_FAILED); | |
343 | return 0; | |
344 | } | |
345 | ||
346 | return 1; | |
347 | } | |
348 | ||
349 | static int afalg_create_sk(afalg_ctx *actx, const char *ciphertype, | |
350 | const char *ciphername) | |
351 | { | |
352 | struct sockaddr_alg sa; | |
7f458a48 | 353 | |
354 | actx->bfd = actx->sfd = -1; | |
6cba4a66 | 355 | int r = -1; |
7f458a48 | 356 | |
6cba4a66 | 357 | memset(&sa, 0, sizeof(sa)); |
358 | sa.salg_family = AF_ALG; | |
359 | strncpy((char *) sa.salg_type, ciphertype, ALG_MAX_SALG_TYPE); | |
360 | sa.salg_type[ALG_MAX_SALG_TYPE-1] = '\0'; | |
361 | strncpy((char *) sa.salg_name, ciphername, ALG_MAX_SALG_NAME); | |
362 | sa.salg_name[ALG_MAX_SALG_NAME-1] = '\0'; | |
363 | ||
364 | actx->bfd = socket(AF_ALG, SOCK_SEQPACKET, 0); | |
365 | if (actx->bfd == -1) { | |
366 | ALG_PERR("%s: Failed to open socket : ", __func__); | |
367 | AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_CREATE_FAILED); | |
368 | goto err; | |
7f458a48 | 369 | } |
370 | ||
6cba4a66 | 371 | r = bind(actx->bfd, (struct sockaddr *)&sa, sizeof(sa)); |
372 | if (r < 0) { | |
373 | ALG_PERR("%s: Failed to bind socket : ", __func__); | |
374 | AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_BIND_FAILED); | |
7f458a48 | 375 | goto err; |
376 | } | |
377 | ||
7f458a48 | 378 | actx->sfd = accept(actx->bfd, NULL, 0); |
379 | if (actx->sfd < 0) { | |
380 | ALG_PERR("%s: Socket Accept Failed : ", __func__); | |
6cba4a66 | 381 | AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_ACCEPT_FAILED); |
7f458a48 | 382 | goto err; |
383 | } | |
384 | ||
6cba4a66 | 385 | return 1; |
7f458a48 | 386 | |
387 | err: | |
388 | if (actx->bfd >= 0) | |
389 | close(actx->bfd); | |
390 | if (actx->sfd >= 0) | |
391 | close(actx->sfd); | |
392 | actx->bfd = actx->sfd = -1; | |
6cba4a66 | 393 | return 0; |
7f458a48 | 394 | } |
395 | ||
396 | static int afalg_start_cipher_sk(afalg_ctx *actx, const unsigned char *in, | |
397 | size_t inl, const unsigned char *iv, | |
398 | unsigned int enc) | |
399 | { | |
400 | struct msghdr msg = { 0 }; | |
401 | struct cmsghdr *cmsg; | |
402 | struct iovec iov; | |
403 | ssize_t sbytes; | |
404 | # ifdef ALG_ZERO_COPY | |
405 | int ret; | |
406 | # endif | |
a1933888 | 407 | char cbuf[CMSG_SPACE(ALG_IV_LEN(ALG_AES_IV_LEN)) + CMSG_SPACE(ALG_OP_LEN)]; |
7f458a48 | 408 | |
a1933888 | 409 | memset(cbuf, 0, sizeof(cbuf)); |
7f458a48 | 410 | msg.msg_control = cbuf; |
a1933888 | 411 | msg.msg_controllen = sizeof(cbuf); |
7f458a48 | 412 | |
413 | /* | |
414 | * cipher direction (i.e. encrypt or decrypt) and iv are sent to the | |
415 | * kernel as part of sendmsg()'s ancillary data | |
416 | */ | |
417 | cmsg = CMSG_FIRSTHDR(&msg); | |
418 | afalg_set_op_sk(cmsg, enc); | |
419 | cmsg = CMSG_NXTHDR(&msg, cmsg); | |
420 | afalg_set_iv_sk(cmsg, iv, ALG_AES_IV_LEN); | |
421 | ||
422 | /* iov that describes input data */ | |
423 | iov.iov_base = (unsigned char *)in; | |
424 | iov.iov_len = inl; | |
425 | ||
426 | msg.msg_flags = MSG_MORE; | |
427 | ||
428 | # ifdef ALG_ZERO_COPY | |
429 | /* | |
430 | * ZERO_COPY mode | |
431 | * Works best when buffer is 4k aligned | |
432 | * OPENS: out of place processing (i.e. out != in) | |
433 | */ | |
434 | ||
435 | /* Input data is not sent as part of call to sendmsg() */ | |
436 | msg.msg_iovlen = 0; | |
437 | msg.msg_iov = NULL; | |
438 | ||
439 | /* Sendmsg() sends iv and cipher direction to the kernel */ | |
440 | sbytes = sendmsg(actx->sfd, &msg, 0); | |
441 | if (sbytes < 0) { | |
442 | ALG_PERR("%s: sendmsg failed for zero copy cipher operation : ", | |
443 | __func__); | |
444 | return 0; | |
445 | } | |
446 | ||
447 | /* | |
448 | * vmsplice and splice are used to pin the user space input buffer for | |
449 | * kernel space processing avoiding copys from user to kernel space | |
450 | */ | |
451 | ret = vmsplice(actx->zc_pipe[1], &iov, 1, SPLICE_F_GIFT); | |
452 | if (ret < 0) { | |
453 | ALG_PERR("%s: vmsplice failed : ", __func__); | |
454 | return 0; | |
455 | } | |
456 | ||
457 | ret = splice(actx->zc_pipe[0], NULL, actx->sfd, NULL, inl, 0); | |
458 | if (ret < 0) { | |
459 | ALG_PERR("%s: splice failed : ", __func__); | |
460 | return 0; | |
461 | } | |
462 | # else | |
463 | msg.msg_iovlen = 1; | |
464 | msg.msg_iov = &iov; | |
465 | ||
466 | /* Sendmsg() sends iv, cipher direction and input data to the kernel */ | |
467 | sbytes = sendmsg(actx->sfd, &msg, 0); | |
468 | if (sbytes < 0) { | |
469 | ALG_PERR("%s: sendmsg failed for cipher operation : ", __func__); | |
470 | return 0; | |
471 | } | |
472 | ||
473 | if (sbytes != (ssize_t) inl) { | |
6cba4a66 | 474 | ALG_WARN("Cipher operation send bytes %zd != inlen %zd\n", sbytes, |
7f458a48 | 475 | inl); |
476 | return 0; | |
477 | } | |
478 | # endif | |
479 | ||
480 | return 1; | |
481 | } | |
482 | ||
483 | static int afalg_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, | |
484 | const unsigned char *iv, int enc) | |
485 | { | |
486 | int ciphertype; | |
6cba4a66 | 487 | int ret; |
7f458a48 | 488 | afalg_ctx *actx; |
6cba4a66 | 489 | char ciphername[ALG_MAX_SALG_NAME]; |
7f458a48 | 490 | |
491 | if (ctx == NULL || key == NULL) { | |
492 | ALG_WARN("%s: Null Parameter\n", __func__); | |
493 | return 0; | |
494 | } | |
495 | ||
496 | if (EVP_CIPHER_CTX_cipher(ctx) == NULL) { | |
497 | ALG_WARN("%s: Cipher object NULL\n", __func__); | |
498 | return 0; | |
499 | } | |
500 | ||
44ab2dfd | 501 | actx = EVP_CIPHER_CTX_get_cipher_data(ctx); |
7f458a48 | 502 | if (actx == NULL) { |
503 | ALG_WARN("%s: Cipher data NULL\n", __func__); | |
504 | return 0; | |
505 | } | |
506 | ||
507 | ciphertype = EVP_CIPHER_CTX_nid(ctx); | |
508 | switch (ciphertype) { | |
509 | case NID_aes_128_cbc: | |
6cba4a66 | 510 | strncpy(ciphername, "cbc(aes)", ALG_MAX_SALG_NAME); |
7f458a48 | 511 | break; |
512 | default: | |
513 | ALG_WARN("%s: Unsupported Cipher type %d\n", __func__, ciphertype); | |
514 | return 0; | |
515 | } | |
6cba4a66 | 516 | ciphername[ALG_MAX_SALG_NAME-1]='\0'; |
7f458a48 | 517 | |
518 | if (ALG_AES_IV_LEN != EVP_CIPHER_CTX_iv_length(ctx)) { | |
6cba4a66 | 519 | ALG_WARN("%s: Unsupported IV length :%d\n", __func__, |
7f458a48 | 520 | EVP_CIPHER_CTX_iv_length(ctx)); |
521 | return 0; | |
522 | } | |
523 | ||
524 | /* Setup AFALG socket for crypto processing */ | |
6cba4a66 | 525 | ret = afalg_create_sk(actx, "skcipher", ciphername); |
526 | if (ret < 1) | |
7f458a48 | 527 | return 0; |
6cba4a66 | 528 | |
529 | ||
530 | ret = afalg_set_key(actx, key, EVP_CIPHER_CTX_key_length(ctx)); | |
531 | if (ret < 1) | |
532 | goto err; | |
7f458a48 | 533 | |
534 | /* Setup AIO ctx to allow async AFALG crypto processing */ | |
6cba4a66 | 535 | if (afalg_init_aio(&actx->aio) == 0) |
536 | goto err; | |
537 | ||
7f458a48 | 538 | # ifdef ALG_ZERO_COPY |
539 | pipe(actx->zc_pipe); | |
540 | # endif | |
541 | ||
542 | actx->init_done = MAGIC_INIT_NUM; | |
543 | ||
544 | return 1; | |
6cba4a66 | 545 | |
546 | err: | |
547 | close(actx->sfd); | |
548 | close(actx->bfd); | |
549 | return 0; | |
7f458a48 | 550 | } |
551 | ||
552 | static int afalg_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, | |
553 | const unsigned char *in, size_t inl) | |
554 | { | |
555 | afalg_ctx *actx; | |
556 | int ret; | |
557 | char nxtiv[ALG_AES_IV_LEN] = { 0 }; | |
558 | ||
559 | if (ctx == NULL || out == NULL || in == NULL) { | |
560 | ALG_WARN("NULL parameter passed to function %s\n", __func__); | |
561 | return 0; | |
562 | } | |
563 | ||
44ab2dfd | 564 | actx = (afalg_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx); |
7f458a48 | 565 | if (actx == NULL || actx->init_done != MAGIC_INIT_NUM) { |
566 | ALG_WARN("%s afalg ctx passed\n", | |
567 | ctx == NULL ? "NULL" : "Uninitialised"); | |
568 | return 0; | |
569 | } | |
570 | ||
571 | /* | |
572 | * set iv now for decrypt operation as the input buffer can be | |
573 | * overwritten for inplace operation where in = out. | |
574 | */ | |
575 | if (EVP_CIPHER_CTX_encrypting(ctx) == 0) { | |
576 | memcpy(nxtiv, in + (inl - ALG_AES_IV_LEN), ALG_AES_IV_LEN); | |
577 | } | |
578 | ||
579 | /* Send input data to kernel space */ | |
580 | ret = afalg_start_cipher_sk(actx, (unsigned char *)in, inl, | |
581 | EVP_CIPHER_CTX_iv(ctx), | |
582 | EVP_CIPHER_CTX_encrypting(ctx)); | |
583 | if (ret < 1) { | |
584 | return 0; | |
585 | } | |
586 | ||
587 | /* Perform async crypto operation in kernel space */ | |
588 | ret = afalg_fin_cipher_aio(&actx->aio, actx->sfd, out, inl); | |
6cba4a66 | 589 | if (ret < 1) |
7f458a48 | 590 | return 0; |
7f458a48 | 591 | |
592 | if (EVP_CIPHER_CTX_encrypting(ctx)) { | |
593 | memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), out + (inl - ALG_AES_IV_LEN), | |
594 | ALG_AES_IV_LEN); | |
595 | } else { | |
596 | memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), nxtiv, ALG_AES_IV_LEN); | |
597 | } | |
598 | ||
599 | return 1; | |
600 | } | |
601 | ||
602 | static int afalg_cipher_cleanup(EVP_CIPHER_CTX *ctx) | |
603 | { | |
604 | afalg_ctx *actx; | |
605 | ||
606 | if (ctx == NULL) { | |
607 | ALG_WARN("NULL parameter passed to function %s\n", __func__); | |
608 | return 0; | |
609 | } | |
610 | ||
44ab2dfd | 611 | actx = (afalg_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx); |
7f458a48 | 612 | if (actx == NULL || actx->init_done != MAGIC_INIT_NUM) { |
613 | ALG_WARN("%s afalg ctx passed\n", | |
614 | ctx == NULL ? "NULL" : "Uninitialised"); | |
615 | return 0; | |
616 | } | |
617 | ||
618 | close(actx->sfd); | |
619 | close(actx->bfd); | |
620 | # ifdef ALG_ZERO_COPY | |
621 | close(actx->zc_pipe[0]); | |
622 | close(actx->zc_pipe[1]); | |
623 | # endif | |
6cba4a66 | 624 | /* close efd in sync mode, async mode is closed in afalg_waitfd_cleanup() */ |
625 | if (actx->aio.mode == MODE_SYNC) | |
626 | close(actx->aio.efd); | |
7f458a48 | 627 | io_destroy(actx->aio.aio_ctx); |
628 | ||
629 | return 1; | |
630 | } | |
631 | ||
632 | const EVP_CIPHER *afalg_aes_128_cbc(void) | |
633 | { | |
634 | if (_hidden_aes_128_cbc == NULL | |
635 | && ((_hidden_aes_128_cbc = | |
636 | EVP_CIPHER_meth_new(NID_aes_128_cbc, | |
637 | AES_BLOCK_SIZE, | |
638 | AES_KEY_SIZE_128)) == NULL | |
639 | || !EVP_CIPHER_meth_set_iv_length(_hidden_aes_128_cbc, AES_IV_LEN) | |
640 | || !EVP_CIPHER_meth_set_flags(_hidden_aes_128_cbc, | |
641 | EVP_CIPH_CBC_MODE | | |
642 | EVP_CIPH_FLAG_DEFAULT_ASN1) | |
643 | || !EVP_CIPHER_meth_set_init(_hidden_aes_128_cbc, | |
644 | afalg_cipher_init) | |
645 | || !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_128_cbc, | |
646 | afalg_do_cipher) | |
647 | || !EVP_CIPHER_meth_set_cleanup(_hidden_aes_128_cbc, | |
648 | afalg_cipher_cleanup) | |
649 | || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_128_cbc, | |
650 | sizeof(afalg_ctx)))) { | |
651 | EVP_CIPHER_meth_free(_hidden_aes_128_cbc); | |
652 | _hidden_aes_128_cbc = NULL; | |
653 | } | |
654 | return _hidden_aes_128_cbc; | |
655 | } | |
656 | ||
657 | static int afalg_ciphers(ENGINE *e, const EVP_CIPHER **cipher, | |
658 | const int **nids, int nid) | |
659 | { | |
660 | int r = 1; | |
661 | ||
662 | if (cipher == NULL) { | |
663 | *nids = afalg_cipher_nids; | |
664 | return (sizeof(afalg_cipher_nids) / sizeof(afalg_cipher_nids[0])); | |
665 | } | |
666 | ||
667 | switch (nid) { | |
668 | case NID_aes_128_cbc: | |
669 | *cipher = afalg_aes_128_cbc(); | |
670 | break; | |
671 | default: | |
672 | *cipher = NULL; | |
673 | r = 0; | |
674 | } | |
675 | ||
676 | return r; | |
677 | } | |
678 | ||
679 | static int bind_afalg(ENGINE *e) | |
680 | { | |
681 | /* Ensure the afalg error handling is set up */ | |
682 | ERR_load_AFALG_strings(); | |
683 | ||
684 | if (!ENGINE_set_id(e, engine_afalg_id) | |
685 | || !ENGINE_set_name(e, engine_afalg_name) | |
686 | || !ENGINE_set_destroy_function(e, afalg_destroy) | |
687 | || !ENGINE_set_init_function(e, afalg_init) | |
688 | || !ENGINE_set_finish_function(e, afalg_finish)) { | |
689 | AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED); | |
690 | return 0; | |
691 | } | |
692 | ||
6cba4a66 | 693 | /* |
694 | * Create _hidden_aes_128_cbc by calling afalg_aes_128_cbc | |
695 | * now, as bind_aflag can only be called by one thread at a | |
696 | * time. | |
697 | */ | |
698 | if (afalg_aes_128_cbc() == NULL) { | |
699 | AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED); | |
700 | return 0; | |
701 | } | |
702 | ||
7f458a48 | 703 | if (!ENGINE_set_ciphers(e, afalg_ciphers)) { |
704 | AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED); | |
705 | return 0; | |
706 | } | |
707 | ||
708 | return 1; | |
709 | } | |
710 | ||
711 | # ifndef OPENSSL_NO_DYNAMIC_ENGINE | |
712 | static int bind_helper(ENGINE *e, const char *id) | |
713 | { | |
714 | if (id && (strcmp(id, engine_afalg_id) != 0)) | |
715 | return 0; | |
716 | ||
717 | if (!afalg_chk_platform()) | |
718 | return 0; | |
719 | ||
720 | if (!bind_afalg(e)) | |
721 | return 0; | |
722 | return 1; | |
723 | } | |
724 | ||
725 | IMPLEMENT_DYNAMIC_CHECK_FN() | |
726 | IMPLEMENT_DYNAMIC_BIND_FN(bind_helper) | |
727 | # endif | |
6cba4a66 | 728 | |
7f458a48 | 729 | static int afalg_chk_platform(void) |
730 | { | |
731 | int ret; | |
732 | int i; | |
733 | int kver[3] = { -1, -1, -1 }; | |
734 | char *str; | |
735 | struct utsname ut; | |
736 | ||
737 | ret = uname(&ut); | |
738 | if (ret != 0) { | |
6cba4a66 | 739 | AFALGerr(AFALG_F_AFALG_CHK_PLATFORM, |
740 | AFALG_R_FAILED_TO_GET_PLATFORM_INFO); | |
7f458a48 | 741 | return 0; |
742 | } | |
743 | ||
744 | str = strtok(ut.release, "."); | |
745 | for (i = 0; i < 3 && str != NULL; i++) { | |
746 | kver[i] = atoi(str); | |
747 | str = strtok(NULL, "."); | |
748 | } | |
749 | ||
750 | if (KERNEL_VERSION(kver[0], kver[1], kver[2]) | |
751 | < KERNEL_VERSION(K_MAJ, K_MIN1, K_MIN2)) { | |
6cba4a66 | 752 | ALG_ERR("ASYNC AFALG not supported this kernel(%d.%d.%d)\n", |
7f458a48 | 753 | kver[0], kver[1], kver[2]); |
6cba4a66 | 754 | ALG_ERR("ASYNC AFALG requires kernel version %d.%d.%d or later\n", |
7f458a48 | 755 | K_MAJ, K_MIN1, K_MIN2); |
756 | AFALGerr(AFALG_F_AFALG_CHK_PLATFORM, | |
757 | AFALG_R_KERNEL_DOES_NOT_SUPPORT_ASYNC_AFALG); | |
758 | return 0; | |
759 | } | |
760 | ||
761 | return 1; | |
762 | } | |
763 | ||
764 | # ifdef OPENSSL_NO_DYNAMIC_ENGINE | |
765 | static ENGINE *engine_afalg(void) | |
766 | { | |
767 | ENGINE *ret = ENGINE_new(); | |
768 | if (ret == NULL) | |
769 | return NULL; | |
770 | if (!bind_afalg(ret)) { | |
771 | ENGINE_free(ret); | |
772 | return NULL; | |
773 | } | |
774 | return ret; | |
775 | } | |
776 | ||
b3599dbb | 777 | void engine_load_afalg_int(void) |
7f458a48 | 778 | { |
779 | ENGINE *toadd; | |
780 | ||
781 | if (!afalg_chk_platform()) | |
782 | return; | |
783 | ||
784 | toadd = engine_afalg(); | |
785 | if (toadd == NULL) | |
786 | return; | |
787 | ENGINE_add(toadd); | |
788 | ENGINE_free(toadd); | |
789 | ERR_clear_error(); | |
790 | } | |
791 | # endif | |
792 | ||
793 | static int afalg_init(ENGINE *e) | |
794 | { | |
795 | return 1; | |
796 | } | |
797 | ||
798 | static int afalg_finish(ENGINE *e) | |
799 | { | |
800 | return 1; | |
801 | } | |
802 | ||
803 | static int afalg_destroy(ENGINE *e) | |
804 | { | |
805 | ERR_unload_AFALG_strings(); | |
256ed966 MC |
806 | EVP_CIPHER_meth_free(_hidden_aes_128_cbc); |
807 | _hidden_aes_128_cbc = NULL; | |
7f458a48 | 808 | return 1; |
809 | } | |
810 | ||
811 | #endif /* KERNEL VERSION */ |