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Commit | Line | Data |
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440e5d80 | 1 | /* |
6738bf14 | 2 | * Copyright 2016-2018 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 */ | |
4e399729 AP |
11 | #ifndef _GNU_SOURCE |
12 | # define _GNU_SOURCE | |
13 | #endif | |
7f458a48 | 14 | #include <stdio.h> |
15 | #include <string.h> | |
16 | #include <unistd.h> | |
17 | ||
18 | #include <openssl/engine.h> | |
19 | #include <openssl/async.h> | |
6bf73e53 | 20 | #include <openssl/err.h> |
49ea0f09 | 21 | #include "internal/nelem.h" |
7f458a48 | 22 | |
4e399729 | 23 | #include <sys/socket.h> |
7f458a48 | 24 | #include <linux/version.h> |
25 | #define K_MAJ 4 | |
26 | #define K_MIN1 1 | |
27 | #define K_MIN2 0 | |
3ba70235 | 28 | #if LINUX_VERSION_CODE < KERNEL_VERSION(K_MAJ, K_MIN1, K_MIN2) || \ |
4e399729 | 29 | !defined(AF_ALG) |
97043e46 RL |
30 | # ifndef PEDANTIC |
31 | # warning "AFALG ENGINE requires Kernel Headers >= 4.1.0" | |
32 | # warning "Skipping Compilation of AFALG engine" | |
33 | # endif | |
a1fd1fb2 | 34 | void engine_load_afalg_int(void); |
627537dd MC |
35 | void engine_load_afalg_int(void) |
36 | { | |
37 | } | |
7f458a48 | 38 | #else |
39 | ||
40 | # include <linux/if_alg.h> | |
7f458a48 | 41 | # include <fcntl.h> |
42 | # include <sys/utsname.h> | |
43 | ||
44 | # include <linux/aio_abi.h> | |
45 | # include <sys/syscall.h> | |
46 | # include <errno.h> | |
47 | ||
48 | # include "e_afalg.h" | |
52df25cf | 49 | # include "e_afalg_err.c" |
7f458a48 | 50 | |
51 | # ifndef SOL_ALG | |
52 | # define SOL_ALG 279 | |
53 | # endif | |
54 | ||
55 | # ifdef ALG_ZERO_COPY | |
56 | # ifndef SPLICE_F_GIFT | |
57 | # define SPLICE_F_GIFT (0x08) | |
58 | # endif | |
59 | # endif | |
60 | ||
61 | # define ALG_AES_IV_LEN 16 | |
62 | # define ALG_IV_LEN(len) (sizeof(struct af_alg_iv) + (len)) | |
63 | # define ALG_OP_TYPE unsigned int | |
64 | # define ALG_OP_LEN (sizeof(ALG_OP_TYPE)) | |
65 | ||
6cba4a66 | 66 | #define ALG_MAX_SALG_NAME 64 |
67 | #define ALG_MAX_SALG_TYPE 14 | |
68 | ||
69 | # ifdef OPENSSL_NO_DYNAMIC_ENGINE | |
b3599dbb | 70 | void engine_load_afalg_int(void); |
6cba4a66 | 71 | # endif |
72 | ||
7f458a48 | 73 | /* Local Linkage Functions */ |
74 | static int afalg_init_aio(afalg_aio *aio); | |
75 | static int afalg_fin_cipher_aio(afalg_aio *ptr, int sfd, | |
76 | unsigned char *buf, size_t len); | |
6cba4a66 | 77 | static int afalg_create_sk(afalg_ctx *actx, const char *ciphertype, |
78 | const char *ciphername); | |
7f458a48 | 79 | static int afalg_destroy(ENGINE *e); |
80 | static int afalg_init(ENGINE *e); | |
81 | static int afalg_finish(ENGINE *e); | |
3a7141df | 82 | static const EVP_CIPHER *afalg_aes_cbc(int nid); |
7e8a5e30 | 83 | static cbc_handles *get_cipher_handle(int nid); |
7f458a48 | 84 | static int afalg_ciphers(ENGINE *e, const EVP_CIPHER **cipher, |
85 | const int **nids, int nid); | |
86 | static int afalg_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, | |
87 | const unsigned char *iv, int enc); | |
88 | static int afalg_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, | |
89 | const unsigned char *in, size_t inl); | |
90 | static int afalg_cipher_cleanup(EVP_CIPHER_CTX *ctx); | |
91 | static int afalg_chk_platform(void); | |
92 | ||
93 | /* Engine Id and Name */ | |
94 | static const char *engine_afalg_id = "afalg"; | |
538dbbc6 | 95 | static const char *engine_afalg_name = "AFALG engine support"; |
7f458a48 | 96 | |
a1933888 | 97 | static int afalg_cipher_nids[] = { |
49ea0f09 J |
98 | NID_aes_128_cbc, |
99 | NID_aes_192_cbc, | |
100 | NID_aes_256_cbc, | |
7f458a48 | 101 | }; |
102 | ||
49ea0f09 J |
103 | static cbc_handles cbc_handle[] = {{AES_KEY_SIZE_128, NULL}, |
104 | {AES_KEY_SIZE_192, NULL}, | |
105 | {AES_KEY_SIZE_256, NULL}}; | |
7f458a48 | 106 | |
2a7de0fd | 107 | static ossl_inline int io_setup(unsigned n, aio_context_t *ctx) |
7f458a48 | 108 | { |
109 | return syscall(__NR_io_setup, n, ctx); | |
110 | } | |
111 | ||
2a7de0fd | 112 | static ossl_inline int eventfd(int n) |
7f458a48 | 113 | { |
bee9c8a4 | 114 | return syscall(__NR_eventfd2, n, 0); |
7f458a48 | 115 | } |
116 | ||
2a7de0fd | 117 | static ossl_inline int io_destroy(aio_context_t ctx) |
7f458a48 | 118 | { |
119 | return syscall(__NR_io_destroy, ctx); | |
120 | } | |
121 | ||
2a7de0fd | 122 | static ossl_inline int io_read(aio_context_t ctx, long n, struct iocb **iocb) |
7f458a48 | 123 | { |
124 | return syscall(__NR_io_submit, ctx, n, iocb); | |
125 | } | |
126 | ||
2a7de0fd | 127 | static ossl_inline int io_getevents(aio_context_t ctx, long min, long max, |
7f458a48 | 128 | struct io_event *events, |
129 | struct timespec *timeout) | |
130 | { | |
131 | return syscall(__NR_io_getevents, ctx, min, max, events, timeout); | |
132 | } | |
133 | ||
134 | static void afalg_waitfd_cleanup(ASYNC_WAIT_CTX *ctx, const void *key, | |
135 | OSSL_ASYNC_FD waitfd, void *custom) | |
136 | { | |
137 | close(waitfd); | |
138 | } | |
139 | ||
140 | static int afalg_setup_async_event_notification(afalg_aio *aio) | |
141 | { | |
142 | ASYNC_JOB *job; | |
143 | ASYNC_WAIT_CTX *waitctx; | |
144 | void *custom = NULL; | |
6cba4a66 | 145 | int ret; |
7f458a48 | 146 | |
147 | if ((job = ASYNC_get_current_job()) != NULL) { | |
148 | /* Async mode */ | |
149 | waitctx = ASYNC_get_wait_ctx(job); | |
150 | if (waitctx == NULL) { | |
151 | ALG_WARN("%s: ASYNC_get_wait_ctx error", __func__); | |
152 | return 0; | |
153 | } | |
46f4e1be | 154 | /* Get waitfd from ASYNC_WAIT_CTX if it is already set */ |
6cba4a66 | 155 | ret = ASYNC_WAIT_CTX_get_fd(waitctx, engine_afalg_id, |
156 | &aio->efd, &custom); | |
157 | if (ret == 0) { | |
158 | /* | |
159 | * waitfd is not set in ASYNC_WAIT_CTX, create a new one | |
160 | * and set it. efd will be signaled when AIO operation completes | |
161 | */ | |
162 | aio->efd = eventfd(0); | |
163 | if (aio->efd == -1) { | |
7f458a48 | 164 | ALG_PERR("%s: Failed to get eventfd : ", __func__); |
165 | AFALGerr(AFALG_F_AFALG_SETUP_ASYNC_EVENT_NOTIFICATION, | |
166 | AFALG_R_EVENTFD_FAILED); | |
167 | return 0; | |
168 | } | |
6cba4a66 | 169 | ret = ASYNC_WAIT_CTX_set_wait_fd(waitctx, engine_afalg_id, |
170 | aio->efd, custom, | |
171 | afalg_waitfd_cleanup); | |
172 | if (ret == 0) { | |
7f458a48 | 173 | ALG_WARN("%s: Failed to set wait fd", __func__); |
6cba4a66 | 174 | close(aio->efd); |
7f458a48 | 175 | return 0; |
176 | } | |
177 | /* make fd non-blocking in async mode */ | |
6cba4a66 | 178 | if (fcntl(aio->efd, F_SETFL, O_NONBLOCK) != 0) { |
7f458a48 | 179 | ALG_WARN("%s: Failed to set event fd as NONBLOCKING", |
180 | __func__); | |
181 | } | |
182 | } | |
6cba4a66 | 183 | aio->mode = MODE_ASYNC; |
7f458a48 | 184 | } else { |
185 | /* Sync mode */ | |
6cba4a66 | 186 | aio->efd = eventfd(0); |
187 | if (aio->efd == -1) { | |
7f458a48 | 188 | ALG_PERR("%s: Failed to get eventfd : ", __func__); |
189 | AFALGerr(AFALG_F_AFALG_SETUP_ASYNC_EVENT_NOTIFICATION, | |
190 | AFALG_R_EVENTFD_FAILED); | |
191 | return 0; | |
192 | } | |
6cba4a66 | 193 | aio->mode = MODE_SYNC; |
7f458a48 | 194 | } |
195 | return 1; | |
196 | } | |
197 | ||
3a7141df | 198 | static int afalg_init_aio(afalg_aio *aio) |
7f458a48 | 199 | { |
200 | int r = -1; | |
201 | ||
202 | /* Initialise for AIO */ | |
203 | aio->aio_ctx = 0; | |
204 | r = io_setup(MAX_INFLIGHTS, &aio->aio_ctx); | |
205 | if (r < 0) { | |
206 | ALG_PERR("%s: io_setup error : ", __func__); | |
207 | AFALGerr(AFALG_F_AFALG_INIT_AIO, AFALG_R_IO_SETUP_FAILED); | |
208 | return 0; | |
209 | } | |
210 | ||
211 | memset(aio->cbt, 0, sizeof(aio->cbt)); | |
7f458a48 | 212 | aio->efd = -1; |
6cba4a66 | 213 | aio->mode = MODE_UNINIT; |
7f458a48 | 214 | |
215 | return 1; | |
216 | } | |
217 | ||
3a7141df RL |
218 | static int afalg_fin_cipher_aio(afalg_aio *aio, int sfd, unsigned char *buf, |
219 | size_t len) | |
7f458a48 | 220 | { |
221 | int r; | |
222 | int retry = 0; | |
223 | unsigned int done = 0; | |
224 | struct iocb *cb; | |
225 | struct timespec timeout; | |
226 | struct io_event events[MAX_INFLIGHTS]; | |
227 | u_int64_t eval = 0; | |
228 | ||
229 | timeout.tv_sec = 0; | |
230 | timeout.tv_nsec = 0; | |
231 | ||
232 | /* if efd has not been initialised yet do it here */ | |
6cba4a66 | 233 | if (aio->mode == MODE_UNINIT) { |
7f458a48 | 234 | r = afalg_setup_async_event_notification(aio); |
235 | if (r == 0) | |
236 | return 0; | |
237 | } | |
238 | ||
239 | cb = &(aio->cbt[0 % MAX_INFLIGHTS]); | |
240 | memset(cb, '\0', sizeof(*cb)); | |
241 | cb->aio_fildes = sfd; | |
242 | cb->aio_lio_opcode = IOCB_CMD_PREAD; | |
c27778d8 AP |
243 | /* |
244 | * The pointer has to be converted to unsigned value first to avoid | |
245 | * sign extension on cast to 64 bit value in 32-bit builds | |
246 | */ | |
247 | cb->aio_buf = (size_t)buf; | |
7f458a48 | 248 | cb->aio_offset = 0; |
249 | cb->aio_data = 0; | |
250 | cb->aio_nbytes = len; | |
251 | cb->aio_flags = IOCB_FLAG_RESFD; | |
252 | cb->aio_resfd = aio->efd; | |
253 | ||
254 | /* | |
255 | * Perform AIO read on AFALG socket, this in turn performs an async | |
256 | * crypto operation in kernel space | |
257 | */ | |
258 | r = io_read(aio->aio_ctx, 1, &cb); | |
259 | if (r < 0) { | |
6cba4a66 | 260 | ALG_PWARN("%s: io_read failed : ", __func__); |
7f458a48 | 261 | return 0; |
262 | } | |
263 | ||
264 | do { | |
265 | /* While AIO read is being performed pause job */ | |
266 | ASYNC_pause_job(); | |
267 | ||
268 | /* Check for completion of AIO read */ | |
269 | r = read(aio->efd, &eval, sizeof(eval)); | |
270 | if (r < 0) { | |
271 | if (errno == EAGAIN || errno == EWOULDBLOCK) | |
272 | continue; | |
273 | ALG_PERR("%s: read failed for event fd : ", __func__); | |
274 | return 0; | |
275 | } else if (r == 0 || eval <= 0) { | |
276 | ALG_WARN("%s: eventfd read %d bytes, eval = %lu\n", __func__, r, | |
277 | eval); | |
278 | } | |
279 | if (eval > 0) { | |
280 | ||
281 | /* Get results of AIO read */ | |
6cba4a66 | 282 | r = io_getevents(aio->aio_ctx, 1, MAX_INFLIGHTS, |
283 | events, &timeout); | |
7f458a48 | 284 | if (r > 0) { |
285 | /* | |
286 | * events.res indicates the actual status of the operation. | |
287 | * Handle the error condition first. | |
288 | */ | |
289 | if (events[0].res < 0) { | |
290 | /* | |
291 | * Underlying operation cannot be completed at the time | |
292 | * of previous submission. Resubmit for the operation. | |
293 | */ | |
294 | if (events[0].res == -EBUSY && retry++ < 3) { | |
295 | r = io_read(aio->aio_ctx, 1, &cb); | |
296 | if (r < 0) { | |
297 | ALG_PERR("%s: retry %d for io_read failed : ", | |
298 | __func__, retry); | |
299 | return 0; | |
300 | } | |
301 | continue; | |
302 | } else { | |
303 | /* | |
304 | * Retries exceed for -EBUSY or unrecoverable error | |
305 | * condition for this instance of operation. | |
306 | */ | |
307 | ALG_WARN | |
308 | ("%s: Crypto Operation failed with code %lld\n", | |
309 | __func__, events[0].res); | |
310 | return 0; | |
311 | } | |
312 | } | |
313 | /* Operation successful. */ | |
314 | done = 1; | |
315 | } else if (r < 0) { | |
316 | ALG_PERR("%s: io_getevents failed : ", __func__); | |
317 | return 0; | |
318 | } else { | |
319 | ALG_WARN("%s: io_geteventd read 0 bytes\n", __func__); | |
320 | } | |
321 | } | |
322 | } while (!done); | |
323 | ||
324 | return 1; | |
325 | } | |
326 | ||
2a7de0fd | 327 | static ossl_inline void afalg_set_op_sk(struct cmsghdr *cmsg, |
574cffd5 | 328 | const ALG_OP_TYPE op) |
7f458a48 | 329 | { |
330 | cmsg->cmsg_level = SOL_ALG; | |
331 | cmsg->cmsg_type = ALG_SET_OP; | |
332 | cmsg->cmsg_len = CMSG_LEN(ALG_OP_LEN); | |
574cffd5 | 333 | memcpy(CMSG_DATA(cmsg), &op, ALG_OP_LEN); |
7f458a48 | 334 | } |
335 | ||
336 | static void afalg_set_iv_sk(struct cmsghdr *cmsg, const unsigned char *iv, | |
337 | const unsigned int len) | |
338 | { | |
339 | struct af_alg_iv *aiv; | |
340 | ||
341 | cmsg->cmsg_level = SOL_ALG; | |
342 | cmsg->cmsg_type = ALG_SET_IV; | |
343 | cmsg->cmsg_len = CMSG_LEN(ALG_IV_LEN(len)); | |
344 | aiv = (struct af_alg_iv *)CMSG_DATA(cmsg); | |
345 | aiv->ivlen = len; | |
346 | memcpy(aiv->iv, iv, len); | |
347 | } | |
348 | ||
2a7de0fd | 349 | static ossl_inline int afalg_set_key(afalg_ctx *actx, const unsigned char *key, |
6cba4a66 | 350 | const int klen) |
7f458a48 | 351 | { |
352 | int ret; | |
6cba4a66 | 353 | ret = setsockopt(actx->bfd, SOL_ALG, ALG_SET_KEY, key, klen); |
354 | if (ret < 0) { | |
355 | ALG_PERR("%s: Failed to set socket option : ", __func__); | |
356 | AFALGerr(AFALG_F_AFALG_SET_KEY, AFALG_R_SOCKET_SET_KEY_FAILED); | |
357 | return 0; | |
358 | } | |
6cba4a66 | 359 | return 1; |
360 | } | |
361 | ||
362 | static int afalg_create_sk(afalg_ctx *actx, const char *ciphertype, | |
363 | const char *ciphername) | |
364 | { | |
365 | struct sockaddr_alg sa; | |
c27778d8 | 366 | int r = -1; |
7f458a48 | 367 | |
368 | actx->bfd = actx->sfd = -1; | |
369 | ||
6cba4a66 | 370 | memset(&sa, 0, sizeof(sa)); |
371 | sa.salg_family = AF_ALG; | |
372 | strncpy((char *) sa.salg_type, ciphertype, ALG_MAX_SALG_TYPE); | |
373 | sa.salg_type[ALG_MAX_SALG_TYPE-1] = '\0'; | |
374 | strncpy((char *) sa.salg_name, ciphername, ALG_MAX_SALG_NAME); | |
375 | sa.salg_name[ALG_MAX_SALG_NAME-1] = '\0'; | |
376 | ||
377 | actx->bfd = socket(AF_ALG, SOCK_SEQPACKET, 0); | |
378 | if (actx->bfd == -1) { | |
379 | ALG_PERR("%s: Failed to open socket : ", __func__); | |
380 | AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_CREATE_FAILED); | |
381 | goto err; | |
7f458a48 | 382 | } |
383 | ||
6cba4a66 | 384 | r = bind(actx->bfd, (struct sockaddr *)&sa, sizeof(sa)); |
385 | if (r < 0) { | |
386 | ALG_PERR("%s: Failed to bind socket : ", __func__); | |
387 | AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_BIND_FAILED); | |
7f458a48 | 388 | goto err; |
389 | } | |
390 | ||
7f458a48 | 391 | actx->sfd = accept(actx->bfd, NULL, 0); |
392 | if (actx->sfd < 0) { | |
393 | ALG_PERR("%s: Socket Accept Failed : ", __func__); | |
6cba4a66 | 394 | AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_ACCEPT_FAILED); |
7f458a48 | 395 | goto err; |
396 | } | |
397 | ||
6cba4a66 | 398 | return 1; |
7f458a48 | 399 | |
400 | err: | |
401 | if (actx->bfd >= 0) | |
402 | close(actx->bfd); | |
403 | if (actx->sfd >= 0) | |
404 | close(actx->sfd); | |
405 | actx->bfd = actx->sfd = -1; | |
6cba4a66 | 406 | return 0; |
7f458a48 | 407 | } |
408 | ||
409 | static int afalg_start_cipher_sk(afalg_ctx *actx, const unsigned char *in, | |
410 | size_t inl, const unsigned char *iv, | |
411 | unsigned int enc) | |
412 | { | |
413 | struct msghdr msg = { 0 }; | |
414 | struct cmsghdr *cmsg; | |
415 | struct iovec iov; | |
416 | ssize_t sbytes; | |
417 | # ifdef ALG_ZERO_COPY | |
418 | int ret; | |
419 | # endif | |
a1933888 | 420 | char cbuf[CMSG_SPACE(ALG_IV_LEN(ALG_AES_IV_LEN)) + CMSG_SPACE(ALG_OP_LEN)]; |
7f458a48 | 421 | |
a1933888 | 422 | memset(cbuf, 0, sizeof(cbuf)); |
7f458a48 | 423 | msg.msg_control = cbuf; |
a1933888 | 424 | msg.msg_controllen = sizeof(cbuf); |
7f458a48 | 425 | |
426 | /* | |
427 | * cipher direction (i.e. encrypt or decrypt) and iv are sent to the | |
428 | * kernel as part of sendmsg()'s ancillary data | |
429 | */ | |
430 | cmsg = CMSG_FIRSTHDR(&msg); | |
431 | afalg_set_op_sk(cmsg, enc); | |
432 | cmsg = CMSG_NXTHDR(&msg, cmsg); | |
433 | afalg_set_iv_sk(cmsg, iv, ALG_AES_IV_LEN); | |
434 | ||
435 | /* iov that describes input data */ | |
436 | iov.iov_base = (unsigned char *)in; | |
437 | iov.iov_len = inl; | |
438 | ||
439 | msg.msg_flags = MSG_MORE; | |
440 | ||
441 | # ifdef ALG_ZERO_COPY | |
442 | /* | |
443 | * ZERO_COPY mode | |
444 | * Works best when buffer is 4k aligned | |
445 | * OPENS: out of place processing (i.e. out != in) | |
446 | */ | |
447 | ||
448 | /* Input data is not sent as part of call to sendmsg() */ | |
449 | msg.msg_iovlen = 0; | |
450 | msg.msg_iov = NULL; | |
451 | ||
452 | /* Sendmsg() sends iv and cipher direction to the kernel */ | |
453 | sbytes = sendmsg(actx->sfd, &msg, 0); | |
454 | if (sbytes < 0) { | |
455 | ALG_PERR("%s: sendmsg failed for zero copy cipher operation : ", | |
456 | __func__); | |
457 | return 0; | |
458 | } | |
459 | ||
460 | /* | |
461 | * vmsplice and splice are used to pin the user space input buffer for | |
462 | * kernel space processing avoiding copys from user to kernel space | |
463 | */ | |
464 | ret = vmsplice(actx->zc_pipe[1], &iov, 1, SPLICE_F_GIFT); | |
465 | if (ret < 0) { | |
466 | ALG_PERR("%s: vmsplice failed : ", __func__); | |
467 | return 0; | |
468 | } | |
469 | ||
470 | ret = splice(actx->zc_pipe[0], NULL, actx->sfd, NULL, inl, 0); | |
471 | if (ret < 0) { | |
472 | ALG_PERR("%s: splice failed : ", __func__); | |
473 | return 0; | |
474 | } | |
475 | # else | |
476 | msg.msg_iovlen = 1; | |
477 | msg.msg_iov = &iov; | |
478 | ||
479 | /* Sendmsg() sends iv, cipher direction and input data to the kernel */ | |
480 | sbytes = sendmsg(actx->sfd, &msg, 0); | |
481 | if (sbytes < 0) { | |
482 | ALG_PERR("%s: sendmsg failed for cipher operation : ", __func__); | |
483 | return 0; | |
484 | } | |
485 | ||
486 | if (sbytes != (ssize_t) inl) { | |
6cba4a66 | 487 | ALG_WARN("Cipher operation send bytes %zd != inlen %zd\n", sbytes, |
7f458a48 | 488 | inl); |
489 | return 0; | |
490 | } | |
491 | # endif | |
492 | ||
493 | return 1; | |
494 | } | |
495 | ||
496 | static int afalg_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, | |
497 | const unsigned char *iv, int enc) | |
498 | { | |
499 | int ciphertype; | |
6cba4a66 | 500 | int ret; |
7f458a48 | 501 | afalg_ctx *actx; |
6cba4a66 | 502 | char ciphername[ALG_MAX_SALG_NAME]; |
7f458a48 | 503 | |
504 | if (ctx == NULL || key == NULL) { | |
505 | ALG_WARN("%s: Null Parameter\n", __func__); | |
506 | return 0; | |
507 | } | |
508 | ||
509 | if (EVP_CIPHER_CTX_cipher(ctx) == NULL) { | |
510 | ALG_WARN("%s: Cipher object NULL\n", __func__); | |
511 | return 0; | |
512 | } | |
513 | ||
44ab2dfd | 514 | actx = EVP_CIPHER_CTX_get_cipher_data(ctx); |
7f458a48 | 515 | if (actx == NULL) { |
516 | ALG_WARN("%s: Cipher data NULL\n", __func__); | |
517 | return 0; | |
518 | } | |
519 | ||
520 | ciphertype = EVP_CIPHER_CTX_nid(ctx); | |
521 | switch (ciphertype) { | |
522 | case NID_aes_128_cbc: | |
49ea0f09 J |
523 | case NID_aes_192_cbc: |
524 | case NID_aes_256_cbc: | |
6cba4a66 | 525 | strncpy(ciphername, "cbc(aes)", ALG_MAX_SALG_NAME); |
7f458a48 | 526 | break; |
527 | default: | |
528 | ALG_WARN("%s: Unsupported Cipher type %d\n", __func__, ciphertype); | |
529 | return 0; | |
530 | } | |
6cba4a66 | 531 | ciphername[ALG_MAX_SALG_NAME-1]='\0'; |
7f458a48 | 532 | |
533 | if (ALG_AES_IV_LEN != EVP_CIPHER_CTX_iv_length(ctx)) { | |
6cba4a66 | 534 | ALG_WARN("%s: Unsupported IV length :%d\n", __func__, |
7f458a48 | 535 | EVP_CIPHER_CTX_iv_length(ctx)); |
536 | return 0; | |
537 | } | |
538 | ||
539 | /* Setup AFALG socket for crypto processing */ | |
6cba4a66 | 540 | ret = afalg_create_sk(actx, "skcipher", ciphername); |
541 | if (ret < 1) | |
7f458a48 | 542 | return 0; |
6cba4a66 | 543 | |
544 | ||
545 | ret = afalg_set_key(actx, key, EVP_CIPHER_CTX_key_length(ctx)); | |
546 | if (ret < 1) | |
547 | goto err; | |
7f458a48 | 548 | |
549 | /* Setup AIO ctx to allow async AFALG crypto processing */ | |
6cba4a66 | 550 | if (afalg_init_aio(&actx->aio) == 0) |
551 | goto err; | |
552 | ||
7f458a48 | 553 | # ifdef ALG_ZERO_COPY |
554 | pipe(actx->zc_pipe); | |
555 | # endif | |
556 | ||
557 | actx->init_done = MAGIC_INIT_NUM; | |
558 | ||
559 | return 1; | |
6cba4a66 | 560 | |
561 | err: | |
562 | close(actx->sfd); | |
563 | close(actx->bfd); | |
564 | return 0; | |
7f458a48 | 565 | } |
566 | ||
567 | static int afalg_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, | |
568 | const unsigned char *in, size_t inl) | |
569 | { | |
570 | afalg_ctx *actx; | |
571 | int ret; | |
572 | char nxtiv[ALG_AES_IV_LEN] = { 0 }; | |
573 | ||
574 | if (ctx == NULL || out == NULL || in == NULL) { | |
575 | ALG_WARN("NULL parameter passed to function %s\n", __func__); | |
576 | return 0; | |
577 | } | |
578 | ||
44ab2dfd | 579 | actx = (afalg_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx); |
7f458a48 | 580 | if (actx == NULL || actx->init_done != MAGIC_INIT_NUM) { |
581 | ALG_WARN("%s afalg ctx passed\n", | |
582 | ctx == NULL ? "NULL" : "Uninitialised"); | |
583 | return 0; | |
584 | } | |
585 | ||
586 | /* | |
587 | * set iv now for decrypt operation as the input buffer can be | |
588 | * overwritten for inplace operation where in = out. | |
589 | */ | |
590 | if (EVP_CIPHER_CTX_encrypting(ctx) == 0) { | |
591 | memcpy(nxtiv, in + (inl - ALG_AES_IV_LEN), ALG_AES_IV_LEN); | |
592 | } | |
593 | ||
594 | /* Send input data to kernel space */ | |
595 | ret = afalg_start_cipher_sk(actx, (unsigned char *)in, inl, | |
596 | EVP_CIPHER_CTX_iv(ctx), | |
597 | EVP_CIPHER_CTX_encrypting(ctx)); | |
598 | if (ret < 1) { | |
599 | return 0; | |
600 | } | |
601 | ||
602 | /* Perform async crypto operation in kernel space */ | |
603 | ret = afalg_fin_cipher_aio(&actx->aio, actx->sfd, out, inl); | |
6cba4a66 | 604 | if (ret < 1) |
7f458a48 | 605 | return 0; |
7f458a48 | 606 | |
607 | if (EVP_CIPHER_CTX_encrypting(ctx)) { | |
608 | memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), out + (inl - ALG_AES_IV_LEN), | |
609 | ALG_AES_IV_LEN); | |
610 | } else { | |
611 | memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), nxtiv, ALG_AES_IV_LEN); | |
612 | } | |
613 | ||
614 | return 1; | |
615 | } | |
616 | ||
617 | static int afalg_cipher_cleanup(EVP_CIPHER_CTX *ctx) | |
618 | { | |
619 | afalg_ctx *actx; | |
620 | ||
621 | if (ctx == NULL) { | |
622 | ALG_WARN("NULL parameter passed to function %s\n", __func__); | |
623 | return 0; | |
624 | } | |
625 | ||
44ab2dfd | 626 | actx = (afalg_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx); |
7f458a48 | 627 | if (actx == NULL || actx->init_done != MAGIC_INIT_NUM) { |
628 | ALG_WARN("%s afalg ctx passed\n", | |
629 | ctx == NULL ? "NULL" : "Uninitialised"); | |
630 | return 0; | |
631 | } | |
632 | ||
633 | close(actx->sfd); | |
634 | close(actx->bfd); | |
635 | # ifdef ALG_ZERO_COPY | |
636 | close(actx->zc_pipe[0]); | |
637 | close(actx->zc_pipe[1]); | |
638 | # endif | |
6cba4a66 | 639 | /* close efd in sync mode, async mode is closed in afalg_waitfd_cleanup() */ |
640 | if (actx->aio.mode == MODE_SYNC) | |
641 | close(actx->aio.efd); | |
7f458a48 | 642 | io_destroy(actx->aio.aio_ctx); |
643 | ||
644 | return 1; | |
645 | } | |
646 | ||
f1138840 | 647 | static cbc_handles *get_cipher_handle(int nid) |
49ea0f09 J |
648 | { |
649 | switch (nid) { | |
650 | case NID_aes_128_cbc: | |
651 | return &cbc_handle[AES_CBC_128]; | |
652 | case NID_aes_192_cbc: | |
653 | return &cbc_handle[AES_CBC_192]; | |
654 | case NID_aes_256_cbc: | |
655 | return &cbc_handle[AES_CBC_256]; | |
656 | default: | |
657 | return NULL; | |
658 | } | |
659 | } | |
660 | ||
3a7141df | 661 | static const EVP_CIPHER *afalg_aes_cbc(int nid) |
7f458a48 | 662 | { |
49ea0f09 J |
663 | cbc_handles *cipher_handle = get_cipher_handle(nid); |
664 | if (cipher_handle->_hidden == NULL | |
665 | && ((cipher_handle->_hidden = | |
666 | EVP_CIPHER_meth_new(nid, | |
667 | AES_BLOCK_SIZE, | |
668 | cipher_handle->key_size)) == NULL | |
669 | || !EVP_CIPHER_meth_set_iv_length(cipher_handle->_hidden, | |
670 | AES_IV_LEN) | |
671 | || !EVP_CIPHER_meth_set_flags(cipher_handle->_hidden, | |
672 | EVP_CIPH_CBC_MODE | | |
673 | EVP_CIPH_FLAG_DEFAULT_ASN1) | |
674 | || !EVP_CIPHER_meth_set_init(cipher_handle->_hidden, | |
675 | afalg_cipher_init) | |
676 | || !EVP_CIPHER_meth_set_do_cipher(cipher_handle->_hidden, | |
677 | afalg_do_cipher) | |
678 | || !EVP_CIPHER_meth_set_cleanup(cipher_handle->_hidden, | |
679 | afalg_cipher_cleanup) | |
680 | || !EVP_CIPHER_meth_set_impl_ctx_size(cipher_handle->_hidden, | |
681 | sizeof(afalg_ctx)))) { | |
682 | EVP_CIPHER_meth_free(cipher_handle->_hidden); | |
683 | cipher_handle->_hidden= NULL; | |
684 | } | |
685 | return cipher_handle->_hidden; | |
7f458a48 | 686 | } |
687 | ||
688 | static int afalg_ciphers(ENGINE *e, const EVP_CIPHER **cipher, | |
689 | const int **nids, int nid) | |
690 | { | |
691 | int r = 1; | |
692 | ||
693 | if (cipher == NULL) { | |
694 | *nids = afalg_cipher_nids; | |
695 | return (sizeof(afalg_cipher_nids) / sizeof(afalg_cipher_nids[0])); | |
696 | } | |
697 | ||
698 | switch (nid) { | |
699 | case NID_aes_128_cbc: | |
49ea0f09 J |
700 | case NID_aes_192_cbc: |
701 | case NID_aes_256_cbc: | |
702 | *cipher = afalg_aes_cbc(nid); | |
7f458a48 | 703 | break; |
704 | default: | |
705 | *cipher = NULL; | |
706 | r = 0; | |
707 | } | |
7f458a48 | 708 | return r; |
709 | } | |
710 | ||
711 | static int bind_afalg(ENGINE *e) | |
712 | { | |
713 | /* Ensure the afalg error handling is set up */ | |
49ea0f09 | 714 | unsigned short i; |
7f458a48 | 715 | ERR_load_AFALG_strings(); |
716 | ||
717 | if (!ENGINE_set_id(e, engine_afalg_id) | |
718 | || !ENGINE_set_name(e, engine_afalg_name) | |
719 | || !ENGINE_set_destroy_function(e, afalg_destroy) | |
720 | || !ENGINE_set_init_function(e, afalg_init) | |
721 | || !ENGINE_set_finish_function(e, afalg_finish)) { | |
722 | AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED); | |
723 | return 0; | |
724 | } | |
725 | ||
6cba4a66 | 726 | /* |
49ea0f09 | 727 | * Create _hidden_aes_xxx_cbc by calling afalg_aes_xxx_cbc |
6cba4a66 | 728 | * now, as bind_aflag can only be called by one thread at a |
729 | * time. | |
730 | */ | |
49ea0f09 J |
731 | for(i = 0; i < OSSL_NELEM(afalg_cipher_nids); i++) { |
732 | if (afalg_aes_cbc(afalg_cipher_nids[i]) == NULL) { | |
733 | AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED); | |
734 | return 0; | |
735 | } | |
6cba4a66 | 736 | } |
737 | ||
7f458a48 | 738 | if (!ENGINE_set_ciphers(e, afalg_ciphers)) { |
739 | AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED); | |
740 | return 0; | |
741 | } | |
742 | ||
743 | return 1; | |
744 | } | |
745 | ||
746 | # ifndef OPENSSL_NO_DYNAMIC_ENGINE | |
747 | static int bind_helper(ENGINE *e, const char *id) | |
748 | { | |
749 | if (id && (strcmp(id, engine_afalg_id) != 0)) | |
750 | return 0; | |
751 | ||
752 | if (!afalg_chk_platform()) | |
753 | return 0; | |
754 | ||
755 | if (!bind_afalg(e)) | |
756 | return 0; | |
757 | return 1; | |
758 | } | |
759 | ||
760 | IMPLEMENT_DYNAMIC_CHECK_FN() | |
761 | IMPLEMENT_DYNAMIC_BIND_FN(bind_helper) | |
762 | # endif | |
6cba4a66 | 763 | |
7f458a48 | 764 | static int afalg_chk_platform(void) |
765 | { | |
766 | int ret; | |
767 | int i; | |
768 | int kver[3] = { -1, -1, -1 }; | |
25b9d11c | 769 | int sock; |
7f458a48 | 770 | char *str; |
771 | struct utsname ut; | |
772 | ||
773 | ret = uname(&ut); | |
774 | if (ret != 0) { | |
6cba4a66 | 775 | AFALGerr(AFALG_F_AFALG_CHK_PLATFORM, |
776 | AFALG_R_FAILED_TO_GET_PLATFORM_INFO); | |
7f458a48 | 777 | return 0; |
778 | } | |
779 | ||
780 | str = strtok(ut.release, "."); | |
781 | for (i = 0; i < 3 && str != NULL; i++) { | |
782 | kver[i] = atoi(str); | |
783 | str = strtok(NULL, "."); | |
784 | } | |
785 | ||
786 | if (KERNEL_VERSION(kver[0], kver[1], kver[2]) | |
787 | < KERNEL_VERSION(K_MAJ, K_MIN1, K_MIN2)) { | |
6cba4a66 | 788 | ALG_ERR("ASYNC AFALG not supported this kernel(%d.%d.%d)\n", |
7f458a48 | 789 | kver[0], kver[1], kver[2]); |
6cba4a66 | 790 | ALG_ERR("ASYNC AFALG requires kernel version %d.%d.%d or later\n", |
7f458a48 | 791 | K_MAJ, K_MIN1, K_MIN2); |
792 | AFALGerr(AFALG_F_AFALG_CHK_PLATFORM, | |
793 | AFALG_R_KERNEL_DOES_NOT_SUPPORT_ASYNC_AFALG); | |
794 | return 0; | |
795 | } | |
796 | ||
25b9d11c MC |
797 | /* Test if we can actually create an AF_ALG socket */ |
798 | sock = socket(AF_ALG, SOCK_SEQPACKET, 0); | |
799 | if (sock == -1) { | |
800 | AFALGerr(AFALG_F_AFALG_CHK_PLATFORM, AFALG_R_SOCKET_CREATE_FAILED); | |
801 | return 0; | |
802 | } | |
803 | close(sock); | |
804 | ||
7f458a48 | 805 | return 1; |
806 | } | |
807 | ||
808 | # ifdef OPENSSL_NO_DYNAMIC_ENGINE | |
809 | static ENGINE *engine_afalg(void) | |
810 | { | |
811 | ENGINE *ret = ENGINE_new(); | |
812 | if (ret == NULL) | |
813 | return NULL; | |
814 | if (!bind_afalg(ret)) { | |
815 | ENGINE_free(ret); | |
816 | return NULL; | |
817 | } | |
818 | return ret; | |
819 | } | |
820 | ||
b3599dbb | 821 | void engine_load_afalg_int(void) |
7f458a48 | 822 | { |
823 | ENGINE *toadd; | |
824 | ||
825 | if (!afalg_chk_platform()) | |
826 | return; | |
827 | ||
828 | toadd = engine_afalg(); | |
829 | if (toadd == NULL) | |
830 | return; | |
831 | ENGINE_add(toadd); | |
832 | ENGINE_free(toadd); | |
833 | ERR_clear_error(); | |
834 | } | |
835 | # endif | |
836 | ||
837 | static int afalg_init(ENGINE *e) | |
838 | { | |
839 | return 1; | |
840 | } | |
841 | ||
842 | static int afalg_finish(ENGINE *e) | |
843 | { | |
844 | return 1; | |
845 | } | |
846 | ||
49ea0f09 J |
847 | static int free_cbc(void) |
848 | { | |
a3d7fd28 | 849 | short unsigned int i; |
49ea0f09 J |
850 | for(i = 0; i < OSSL_NELEM(afalg_cipher_nids); i++) { |
851 | EVP_CIPHER_meth_free(cbc_handle[i]._hidden); | |
852 | cbc_handle[i]._hidden = NULL; | |
853 | } | |
854 | return 1; | |
855 | } | |
856 | ||
7f458a48 | 857 | static int afalg_destroy(ENGINE *e) |
858 | { | |
859 | ERR_unload_AFALG_strings(); | |
49ea0f09 | 860 | free_cbc(); |
7f458a48 | 861 | return 1; |
862 | } | |
863 | ||
864 | #endif /* KERNEL VERSION */ |