engines/afalg/e_afalg.c

   1 /* ====================================================================
   2  * Copyright (c) 1999-2016 The OpenSSL Project.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  *
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in
  13  *    the documentation and/or other materials provided with the
  14  *    distribution.
  15  *
  16  * 3. All advertising materials mentioning features or use of this
  17  *    software must display the following acknowledgment:
  18  *    "This product includes software developed by the OpenSSL Project
  19  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  20  *
  21  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  22  *    endorse or promote products derived from this software without
  23  *    prior written permission. For written permission, please contact
  24  *    openssl-core@OpenSSL.org.
  25  *
  26  * 5. Products derived from this software may not be called "OpenSSL"
  27  *    nor may "OpenSSL" appear in their names without prior written
  28  *    permission of the OpenSSL Project.
  29  *
  30  * 6. Redistributions of any form whatsoever must retain the following
  31  *    acknowledgment:
  32  *    "This product includes software developed by the OpenSSL Project
  33  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  36  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  37  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  38  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  39  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  41  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  42  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  43  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  44  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  45  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  46  * OF THE POSSIBILITY OF SUCH DAMAGE.
  47  * ====================================================================
  48  *
  49  * This product includes cryptographic software written by Eric Young
  50  * (eay@cryptsoft.com).  This product includes software written by Tim
  51  * Hudson (tjh@cryptsoft.com).
  52  *
  53  */
  54
  55 /* Required for vmsplice */
  56 #define _GNU_SOURCE
  57 #include <stdio.h>
  58 #include <string.h>
  59 #include <unistd.h>
  60
  61 #include <openssl/engine.h>
  62 #include <openssl/async.h>
  63 #include <openssl/err.h>
  64
  65 #include <linux/version.h>
  66 #define K_MAJ   4
  67 #define K_MIN1  1
  68 #define K_MIN2  0
  69 #if LINUX_VERSION_CODE <= KERNEL_VERSION(K_MAJ, K_MIN1, K_MIN2)
  70 # warning "AFALG ENGINE requires Kernel Headers >= 4.1.0"
  71 # warning "Skipping Compilation of AFALG engine"
  72 #else
  73
  74 # include <linux/if_alg.h>
  75 # include <sys/socket.h>
  76 # include <fcntl.h>
  77 # include <sys/utsname.h>
  78
  79 # include <linux/aio_abi.h>
  80 # include <sys/syscall.h>
  81 # include <errno.h>
  82
  83 # include "e_afalg.h"
  84
  85 # define AFALG_LIB_NAME "AFALG"
  86 # include "e_afalg_err.h"
  87
  88 # ifndef SOL_ALG
  89 #  define SOL_ALG 279
  90 # endif
  91
  92 # ifdef ALG_ZERO_COPY
  93 #  ifndef SPLICE_F_GIFT
  94 #   define SPLICE_F_GIFT    (0x08)
  95 #  endif
  96 # endif
  97
  98 # define ALG_AES_IV_LEN 16
  99 # define ALG_IV_LEN(len) (sizeof(struct af_alg_iv) + (len))
 100 # define ALG_OP_TYPE     unsigned int
 101 # define ALG_OP_LEN      (sizeof(ALG_OP_TYPE))
 102
 103 #define ALG_MAX_SALG_NAME       64
 104 #define ALG_MAX_SALG_TYPE       14
 105
 106 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
 107 void engine_load_afalg_internal(void);
 108 # endif
 109
 110 /* Local Linkage Functions */
 111 static int afalg_init_aio(afalg_aio *aio);
 112 static int afalg_fin_cipher_aio(afalg_aio *ptr, int sfd,
 113                                 unsigned char *buf, size_t len);
 114 static int afalg_create_sk(afalg_ctx *actx, const char *ciphertype,
 115                                 const char *ciphername);
 116 static int afalg_destroy(ENGINE *e);
 117 static int afalg_init(ENGINE *e);
 118 static int afalg_finish(ENGINE *e);
 119 const EVP_CIPHER *afalg_aes_128_cbc(void);
 120 static int afalg_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
 121                          const int **nids, int nid);
 122 static int afalg_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 123                              const unsigned char *iv, int enc);
 124 static int afalg_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 125                            const unsigned char *in, size_t inl);
 126 static int afalg_cipher_cleanup(EVP_CIPHER_CTX *ctx);
 127 static int afalg_chk_platform(void);
 128
 129 /* Engine Id and Name */
 130 static const char *engine_afalg_id = "afalg";
 131 static const char *engine_afalg_name = "AFLAG engine support";
 132
 133 static int afalg_cipher_nids[] = {
 134     NID_aes_128_cbc
 135 };
 136
 137 static EVP_CIPHER *_hidden_aes_128_cbc = NULL;
 138
 139 static inline int io_setup(unsigned n, aio_context_t *ctx)
 140 {
 141     return syscall(__NR_io_setup, n, ctx);
 142 }
 143
 144 static inline int eventfd(int n)
 145 {
 146     return syscall(__NR_eventfd, n);
 147 }
 148
 149 static inline int io_destroy(aio_context_t ctx)
 150 {
 151     return syscall(__NR_io_destroy, ctx);
 152 }
 153
 154 static inline int io_read(aio_context_t ctx, long n, struct iocb **iocb)
 155 {
 156     return syscall(__NR_io_submit, ctx, n, iocb);
 157 }
 158
 159 static inline int io_getevents(aio_context_t ctx, long min, long max,
 160                                struct io_event *events,
 161                                struct timespec *timeout)
 162 {
 163     return syscall(__NR_io_getevents, ctx, min, max, events, timeout);
 164 }
 165
 166 static void afalg_waitfd_cleanup(ASYNC_WAIT_CTX *ctx, const void *key,
 167                                  OSSL_ASYNC_FD waitfd, void *custom)
 168 {
 169     close(waitfd);
 170 }
 171
 172 static int afalg_setup_async_event_notification(afalg_aio *aio)
 173 {
 174     ASYNC_JOB *job;
 175     ASYNC_WAIT_CTX *waitctx;
 176     void *custom = NULL;
 177     int ret;
 178
 179     if ((job = ASYNC_get_current_job()) != NULL) {
 180         /* Async mode */
 181         waitctx = ASYNC_get_wait_ctx(job);
 182         if (waitctx == NULL) {
 183             ALG_WARN("%s: ASYNC_get_wait_ctx error", __func__);
 184             return 0;
 185         }
 186         /* Get waitfd from ASYNC_WAIT_CTX if it is alreday set */
 187         ret = ASYNC_WAIT_CTX_get_fd(waitctx, engine_afalg_id,
 188                                     &aio->efd, &custom);
 189         if (ret == 0) {
 190             /*
 191              * waitfd is not set in ASYNC_WAIT_CTX, create a new one
 192              * and set it. efd will be signaled when AIO operation completes
 193              */
 194             aio->efd = eventfd(0);
 195             if (aio->efd == -1) {
 196                 ALG_PERR("%s: Failed to get eventfd : ", __func__);
 197                 AFALGerr(AFALG_F_AFALG_SETUP_ASYNC_EVENT_NOTIFICATION,
 198                          AFALG_R_EVENTFD_FAILED);
 199                 return 0;
 200             }
 201             ret = ASYNC_WAIT_CTX_set_wait_fd(waitctx, engine_afalg_id,
 202                                              aio->efd, custom,
 203                                              afalg_waitfd_cleanup);
 204             if (ret == 0) {
 205                 ALG_WARN("%s: Failed to set wait fd", __func__);
 206                 close(aio->efd);
 207                 return 0;
 208             }
 209             /* make fd non-blocking in async mode */
 210             if (fcntl(aio->efd, F_SETFL, O_NONBLOCK) != 0) {
 211                 ALG_WARN("%s: Failed to set event fd as NONBLOCKING",
 212                          __func__);
 213             }
 214         }
 215         aio->mode = MODE_ASYNC;
 216     } else {
 217         /* Sync mode */
 218         aio->efd = eventfd(0);
 219         if (aio->efd == -1) {
 220             ALG_PERR("%s: Failed to get eventfd : ", __func__);
 221             AFALGerr(AFALG_F_AFALG_SETUP_ASYNC_EVENT_NOTIFICATION,
 222                      AFALG_R_EVENTFD_FAILED);
 223             return 0;
 224         }
 225         aio->mode = MODE_SYNC;
 226     }
 227     return 1;
 228 }
 229
 230 int afalg_init_aio(afalg_aio *aio)
 231 {
 232     int r = -1;
 233
 234     /* Initialise for AIO */
 235     aio->aio_ctx = 0;
 236     r = io_setup(MAX_INFLIGHTS, &aio->aio_ctx);
 237     if (r < 0) {
 238         ALG_PERR("%s: io_setup error : ", __func__);
 239         AFALGerr(AFALG_F_AFALG_INIT_AIO, AFALG_R_IO_SETUP_FAILED);
 240         return 0;
 241     }
 242
 243     memset(aio->cbt, 0, sizeof(aio->cbt));
 244     aio->efd = -1;
 245     aio->mode = MODE_UNINIT;
 246
 247     return 1;
 248 }
 249
 250 int afalg_fin_cipher_aio(afalg_aio *aio, int sfd, unsigned char *buf,
 251                          size_t len)
 252 {
 253     int r;
 254     int retry = 0;
 255     unsigned int done = 0;
 256     struct iocb *cb;
 257     struct timespec timeout;
 258     struct io_event events[MAX_INFLIGHTS];
 259     u_int64_t eval = 0;
 260
 261     timeout.tv_sec = 0;
 262     timeout.tv_nsec = 0;
 263
 264     /* if efd has not been initialised yet do it here */
 265     if (aio->mode == MODE_UNINIT) {
 266         r = afalg_setup_async_event_notification(aio);
 267         if (r == 0)
 268             return 0;
 269     }
 270
 271     cb = &(aio->cbt[0 % MAX_INFLIGHTS]);
 272     memset(cb, '\0', sizeof(*cb));
 273     cb->aio_fildes = sfd;
 274     cb->aio_lio_opcode = IOCB_CMD_PREAD;
 275     cb->aio_buf = (unsigned long)buf;
 276     cb->aio_offset = 0;
 277     cb->aio_data = 0;
 278     cb->aio_nbytes = len;
 279     cb->aio_flags = IOCB_FLAG_RESFD;
 280     cb->aio_resfd = aio->efd;
 281
 282     /*
 283      * Perform AIO read on AFALG socket, this in turn performs an async
 284      * crypto operation in kernel space
 285      */
 286     r = io_read(aio->aio_ctx, 1, &cb);
 287     if (r < 0) {
 288         ALG_PWARN("%s: io_read failed : ", __func__);
 289         return 0;
 290     }
 291
 292     do {
 293         /* While AIO read is being performed pause job */
 294         ASYNC_pause_job();
 295
 296         /* Check for completion of AIO read */
 297         r = read(aio->efd, &eval, sizeof(eval));
 298         if (r < 0) {
 299             if (errno == EAGAIN || errno == EWOULDBLOCK)
 300                 continue;
 301             ALG_PERR("%s: read failed for event fd : ", __func__);
 302             return 0;
 303         } else if (r == 0 || eval <= 0) {
 304             ALG_WARN("%s: eventfd read %d bytes, eval = %lu\n", __func__, r,
 305                      eval);
 306         }
 307         if (eval > 0) {
 308
 309             /* Get results of AIO read */
 310             r = io_getevents(aio->aio_ctx, 1, MAX_INFLIGHTS,
 311                              events, &timeout);
 312             if (r > 0) {
 313                 /*
 314                  * events.res indicates the actual status of the operation.
 315                  * Handle the error condition first.
 316                  */
 317                 if (events[0].res < 0) {
 318                     /*
 319                      * Underlying operation cannot be completed at the time
 320                      * of previous submission. Resubmit for the operation.
 321                      */
 322                     if (events[0].res == -EBUSY && retry++ < 3) {
 323                         r = io_read(aio->aio_ctx, 1, &cb);
 324                         if (r < 0) {
 325                             ALG_PERR("%s: retry %d for io_read failed : ",
 326                                      __func__, retry);
 327                             return 0;
 328                         }
 329                         continue;
 330                     } else {
 331                         /*
 332                          * Retries exceed for -EBUSY or unrecoverable error
 333                          * condition for this instance of operation.
 334                          */
 335                         ALG_WARN
 336                             ("%s: Crypto Operation failed with code %lld\n",
 337                              __func__, events[0].res);
 338                         return 0;
 339                     }
 340                 }
 341                 /* Operation successful. */
 342                 done = 1;
 343             } else if (r < 0) {
 344                 ALG_PERR("%s: io_getevents failed : ", __func__);
 345                 return 0;
 346             } else {
 347                 ALG_WARN("%s: io_geteventd read 0 bytes\n", __func__);
 348             }
 349         }
 350     } while (!done);
 351
 352     return 1;
 353 }
 354
 355 static inline void afalg_set_op_sk(struct cmsghdr *cmsg,
 356                                    const unsigned int op)
 357 {
 358     cmsg->cmsg_level = SOL_ALG;
 359     cmsg->cmsg_type = ALG_SET_OP;
 360     cmsg->cmsg_len = CMSG_LEN(ALG_OP_LEN);
 361     *CMSG_DATA(cmsg) = (char)op;
 362 }
 363
 364 static void afalg_set_iv_sk(struct cmsghdr *cmsg, const unsigned char *iv,
 365                             const unsigned int len)
 366 {
 367     struct af_alg_iv *aiv;
 368
 369     cmsg->cmsg_level = SOL_ALG;
 370     cmsg->cmsg_type = ALG_SET_IV;
 371     cmsg->cmsg_len = CMSG_LEN(ALG_IV_LEN(len));
 372     aiv = (struct af_alg_iv *)CMSG_DATA(cmsg);
 373     aiv->ivlen = len;
 374     memcpy(aiv->iv, iv, len);
 375 }
 376
 377 static inline int afalg_set_key(afalg_ctx *actx, const unsigned char *key,
 378                                 const int klen)
 379 {
 380     int ret;
 381     ret = setsockopt(actx->bfd, SOL_ALG, ALG_SET_KEY, key, klen);
 382     if (ret < 0) {
 383         ALG_PERR("%s: Failed to set socket option : ", __func__);
 384         AFALGerr(AFALG_F_AFALG_SET_KEY, AFALG_R_SOCKET_SET_KEY_FAILED);
 385         return 0;
 386     }
 387
 388     return 1;
 389 }
 390
 391 static int afalg_create_sk(afalg_ctx *actx, const char *ciphertype,
 392                                 const char *ciphername)
 393 {
 394     struct sockaddr_alg sa;
 395
 396     actx->bfd = actx->sfd = -1;
 397     int r = -1;
 398
 399     memset(&sa, 0, sizeof(sa));
 400     sa.salg_family = AF_ALG;
 401     strncpy((char *) sa.salg_type, ciphertype, ALG_MAX_SALG_TYPE);
 402     sa.salg_type[ALG_MAX_SALG_TYPE-1] = '\0';
 403     strncpy((char *) sa.salg_name, ciphername, ALG_MAX_SALG_NAME);
 404     sa.salg_name[ALG_MAX_SALG_NAME-1] = '\0';
 405
 406     actx->bfd = socket(AF_ALG, SOCK_SEQPACKET, 0);
 407     if (actx->bfd == -1) {
 408         ALG_PERR("%s: Failed to open socket : ", __func__);
 409         AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_CREATE_FAILED);
 410         goto err;
 411     }
 412
 413     r = bind(actx->bfd, (struct sockaddr *)&sa, sizeof(sa));
 414     if (r < 0) {
 415         ALG_PERR("%s: Failed to bind socket : ", __func__);
 416         AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_BIND_FAILED);
 417         goto err;
 418     }
 419
 420     actx->sfd = accept(actx->bfd, NULL, 0);
 421     if (actx->sfd < 0) {
 422         ALG_PERR("%s: Socket Accept Failed : ", __func__);
 423         AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_ACCEPT_FAILED);
 424         goto err;
 425     }
 426
 427     return 1;
 428
 429  err:
 430     if (actx->bfd >= 0)
 431         close(actx->bfd);
 432     if (actx->sfd >= 0)
 433         close(actx->sfd);
 434     actx->bfd = actx->sfd = -1;
 435     return 0;
 436 }
 437
 438 static int afalg_start_cipher_sk(afalg_ctx *actx, const unsigned char *in,
 439                                  size_t inl, const unsigned char *iv,
 440                                  unsigned int enc)
 441 {
 442     struct msghdr msg = { 0 };
 443     struct cmsghdr *cmsg;
 444     struct iovec iov;
 445     ssize_t sbytes;
 446 # ifdef ALG_ZERO_COPY
 447     int ret;
 448 # endif
 449     char cbuf[CMSG_SPACE(ALG_IV_LEN(ALG_AES_IV_LEN)) + CMSG_SPACE(ALG_OP_LEN)];
 450
 451     memset(cbuf, 0, sizeof(cbuf));
 452     msg.msg_control = cbuf;
 453     msg.msg_controllen = sizeof(cbuf);
 454
 455     /*
 456      * cipher direction (i.e. encrypt or decrypt) and iv are sent to the
 457      * kernel as part of sendmsg()'s ancillary data
 458      */
 459     cmsg = CMSG_FIRSTHDR(&msg);
 460     afalg_set_op_sk(cmsg, enc);
 461     cmsg = CMSG_NXTHDR(&msg, cmsg);
 462     afalg_set_iv_sk(cmsg, iv, ALG_AES_IV_LEN);
 463
 464     /* iov that describes input data */
 465     iov.iov_base = (unsigned char *)in;
 466     iov.iov_len = inl;
 467
 468     msg.msg_flags = MSG_MORE;
 469
 470 # ifdef ALG_ZERO_COPY
 471     /*
 472      * ZERO_COPY mode
 473      * Works best when buffer is 4k aligned
 474      * OPENS: out of place processing (i.e. out != in)
 475      */
 476
 477     /* Input data is not sent as part of call to sendmsg() */
 478     msg.msg_iovlen = 0;
 479     msg.msg_iov = NULL;
 480
 481     /* Sendmsg() sends iv and cipher direction to the kernel */
 482     sbytes = sendmsg(actx->sfd, &msg, 0);
 483     if (sbytes < 0) {
 484         ALG_PERR("%s: sendmsg failed for zero copy cipher operation : ",
 485                  __func__);
 486         return 0;
 487     }
 488
 489     /*
 490      * vmsplice and splice are used to pin the user space input buffer for
 491      * kernel space processing avoiding copys from user to kernel space
 492      */
 493     ret = vmsplice(actx->zc_pipe[1], &iov, 1, SPLICE_F_GIFT);
 494     if (ret < 0) {
 495         ALG_PERR("%s: vmsplice failed : ", __func__);
 496         return 0;
 497     }
 498
 499     ret = splice(actx->zc_pipe[0], NULL, actx->sfd, NULL, inl, 0);
 500     if (ret < 0) {
 501         ALG_PERR("%s: splice failed : ", __func__);
 502         return 0;
 503     }
 504 # else
 505     msg.msg_iovlen = 1;
 506     msg.msg_iov = &iov;
 507
 508     /* Sendmsg() sends iv, cipher direction and input data to the kernel */
 509     sbytes = sendmsg(actx->sfd, &msg, 0);
 510     if (sbytes < 0) {
 511         ALG_PERR("%s: sendmsg failed for cipher operation : ", __func__);
 512         return 0;
 513     }
 514
 515     if (sbytes != (ssize_t) inl) {
 516         ALG_WARN("Cipher operation send bytes %zd != inlen %zd\n", sbytes,
 517                 inl);
 518         return 0;
 519     }
 520 # endif
 521
 522     return 1;
 523 }
 524
 525 static int afalg_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 526                              const unsigned char *iv, int enc)
 527 {
 528     int ciphertype;
 529     int ret;
 530     afalg_ctx *actx;
 531     char ciphername[ALG_MAX_SALG_NAME];
 532
 533     if (ctx == NULL || key == NULL) {
 534         ALG_WARN("%s: Null Parameter\n", __func__);
 535         return 0;
 536     }
 537
 538     if (EVP_CIPHER_CTX_cipher(ctx) == NULL) {
 539         ALG_WARN("%s: Cipher object NULL\n", __func__);
 540         return 0;
 541     }
 542
 543     actx = EVP_CIPHER_CTX_get_cipher_data(ctx);
 544     if (actx == NULL) {
 545         ALG_WARN("%s: Cipher data NULL\n", __func__);
 546         return 0;
 547     }
 548
 549     ciphertype = EVP_CIPHER_CTX_nid(ctx);
 550     switch (ciphertype) {
 551     case NID_aes_128_cbc:
 552         strncpy(ciphername, "cbc(aes)", ALG_MAX_SALG_NAME);
 553         break;
 554     default:
 555         ALG_WARN("%s: Unsupported Cipher type %d\n", __func__, ciphertype);
 556         return 0;
 557     }
 558     ciphername[ALG_MAX_SALG_NAME-1]='\0';
 559
 560     if (ALG_AES_IV_LEN != EVP_CIPHER_CTX_iv_length(ctx)) {
 561         ALG_WARN("%s: Unsupported IV length :%d\n", __func__,
 562                 EVP_CIPHER_CTX_iv_length(ctx));
 563         return 0;
 564     }
 565
 566     /* Setup AFALG socket for crypto processing */
 567     ret = afalg_create_sk(actx, "skcipher", ciphername);
 568     if (ret < 1)
 569         return 0;
 570
 571
 572     ret = afalg_set_key(actx, key, EVP_CIPHER_CTX_key_length(ctx));
 573     if (ret < 1)
 574         goto err;
 575
 576     /* Setup AIO ctx to allow async AFALG crypto processing */
 577     if (afalg_init_aio(&actx->aio) == 0)
 578         goto err;
 579
 580 # ifdef ALG_ZERO_COPY
 581     pipe(actx->zc_pipe);
 582 # endif
 583
 584     actx->init_done = MAGIC_INIT_NUM;
 585
 586     return 1;
 587
 588 err:
 589     close(actx->sfd);
 590     close(actx->bfd);
 591     return 0;
 592 }
 593
 594 static int afalg_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 595                            const unsigned char *in, size_t inl)
 596 {
 597     afalg_ctx *actx;
 598     int ret;
 599     char nxtiv[ALG_AES_IV_LEN] = { 0 };
 600
 601     if (ctx == NULL || out == NULL || in == NULL) {
 602         ALG_WARN("NULL parameter passed to function %s\n", __func__);
 603         return 0;
 604     }
 605
 606     actx = (afalg_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx);
 607     if (actx == NULL || actx->init_done != MAGIC_INIT_NUM) {
 608         ALG_WARN("%s afalg ctx passed\n",
 609                  ctx == NULL ? "NULL" : "Uninitialised");
 610         return 0;
 611     }
 612
 613     /*
 614      * set iv now for decrypt operation as the input buffer can be
 615      * overwritten for inplace operation where in = out.
 616      */
 617     if (EVP_CIPHER_CTX_encrypting(ctx) == 0) {
 618         memcpy(nxtiv, in + (inl - ALG_AES_IV_LEN), ALG_AES_IV_LEN);
 619     }
 620
 621     /* Send input data to kernel space */
 622     ret = afalg_start_cipher_sk(actx, (unsigned char *)in, inl,
 623                                 EVP_CIPHER_CTX_iv(ctx),
 624                                 EVP_CIPHER_CTX_encrypting(ctx));
 625     if (ret < 1) {
 626         return 0;
 627     }
 628
 629     /* Perform async crypto operation in kernel space */
 630     ret = afalg_fin_cipher_aio(&actx->aio, actx->sfd, out, inl);
 631     if (ret < 1)
 632         return 0;
 633
 634     if (EVP_CIPHER_CTX_encrypting(ctx)) {
 635         memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), out + (inl - ALG_AES_IV_LEN),
 636                ALG_AES_IV_LEN);
 637     } else {
 638         memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), nxtiv, ALG_AES_IV_LEN);
 639     }
 640
 641     return 1;
 642 }
 643
 644 static int afalg_cipher_cleanup(EVP_CIPHER_CTX *ctx)
 645 {
 646     afalg_ctx *actx;
 647
 648     if (ctx == NULL) {
 649         ALG_WARN("NULL parameter passed to function %s\n", __func__);
 650         return 0;
 651     }
 652
 653     actx = (afalg_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx);
 654     if (actx == NULL || actx->init_done != MAGIC_INIT_NUM) {
 655         ALG_WARN("%s afalg ctx passed\n",
 656                  ctx == NULL ? "NULL" : "Uninitialised");
 657         return 0;
 658     }
 659
 660     close(actx->sfd);
 661     close(actx->bfd);
 662 # ifdef ALG_ZERO_COPY
 663     close(actx->zc_pipe[0]);
 664     close(actx->zc_pipe[1]);
 665 # endif
 666     /* close efd in sync mode, async mode is closed in afalg_waitfd_cleanup() */
 667     if (actx->aio.mode == MODE_SYNC)
 668         close(actx->aio.efd);
 669     io_destroy(actx->aio.aio_ctx);
 670
 671     return 1;
 672 }
 673
 674 const EVP_CIPHER *afalg_aes_128_cbc(void)
 675 {
 676     if (_hidden_aes_128_cbc == NULL
 677         && ((_hidden_aes_128_cbc =
 678              EVP_CIPHER_meth_new(NID_aes_128_cbc,
 679                                  AES_BLOCK_SIZE,
 680                                  AES_KEY_SIZE_128)) == NULL
 681             || !EVP_CIPHER_meth_set_iv_length(_hidden_aes_128_cbc, AES_IV_LEN)
 682             || !EVP_CIPHER_meth_set_flags(_hidden_aes_128_cbc,
 683                                           EVP_CIPH_CBC_MODE |
 684                                           EVP_CIPH_FLAG_DEFAULT_ASN1)
 685             || !EVP_CIPHER_meth_set_init(_hidden_aes_128_cbc,
 686                                          afalg_cipher_init)
 687             || !EVP_CIPHER_meth_set_do_cipher(_hidden_aes_128_cbc,
 688                                               afalg_do_cipher)
 689             || !EVP_CIPHER_meth_set_cleanup(_hidden_aes_128_cbc,
 690                                             afalg_cipher_cleanup)
 691             || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_aes_128_cbc,
 692                                                   sizeof(afalg_ctx)))) {
 693         EVP_CIPHER_meth_free(_hidden_aes_128_cbc);
 694         _hidden_aes_128_cbc = NULL;
 695     }
 696     return _hidden_aes_128_cbc;
 697 }
 698
 699 static int afalg_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
 700                          const int **nids, int nid)
 701 {
 702     int r = 1;
 703
 704     if (cipher == NULL) {
 705         *nids = afalg_cipher_nids;
 706         return (sizeof(afalg_cipher_nids) / sizeof(afalg_cipher_nids[0]));
 707     }
 708
 709     switch (nid) {
 710     case NID_aes_128_cbc:
 711         *cipher = afalg_aes_128_cbc();
 712         break;
 713     default:
 714         *cipher = NULL;
 715         r = 0;
 716     }
 717
 718     return r;
 719 }
 720
 721 static int bind_afalg(ENGINE *e)
 722 {
 723     /* Ensure the afalg error handling is set up */
 724     ERR_load_AFALG_strings();
 725
 726     if (!ENGINE_set_id(e, engine_afalg_id)
 727         || !ENGINE_set_name(e, engine_afalg_name)
 728         || !ENGINE_set_destroy_function(e, afalg_destroy)
 729         || !ENGINE_set_init_function(e, afalg_init)
 730         || !ENGINE_set_finish_function(e, afalg_finish)) {
 731         AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED);
 732         return 0;
 733     }
 734
 735     /*
 736      * Create _hidden_aes_128_cbc by calling afalg_aes_128_cbc
 737      * now, as bind_aflag can only be called by one thread at a
 738      * time.
 739      */
 740     if (afalg_aes_128_cbc() == NULL) {
 741         AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED);
 742         return 0;
 743     }
 744
 745     if (!ENGINE_set_ciphers(e, afalg_ciphers)) {
 746         AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED);
 747         return 0;
 748     }
 749
 750     return 1;
 751 }
 752
 753 # ifndef OPENSSL_NO_DYNAMIC_ENGINE
 754 static int bind_helper(ENGINE *e, const char *id)
 755 {
 756     if (id && (strcmp(id, engine_afalg_id) != 0))
 757         return 0;
 758
 759     if (!afalg_chk_platform())
 760         return 0;
 761
 762     if (!bind_afalg(e))
 763         return 0;
 764     return 1;
 765 }
 766
 767 IMPLEMENT_DYNAMIC_CHECK_FN()
 768     IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
 769 # endif
 770
 771 static int afalg_chk_platform(void)
 772 {
 773     int ret;
 774     int i;
 775     int kver[3] = { -1, -1, -1 };
 776     char *str;
 777     struct utsname ut;
 778
 779     ret = uname(&ut);
 780     if (ret != 0) {
 781         AFALGerr(AFALG_F_AFALG_CHK_PLATFORM,
 782                  AFALG_R_FAILED_TO_GET_PLATFORM_INFO);
 783         return 0;
 784     }
 785
 786     str = strtok(ut.release, ".");
 787     for (i = 0; i < 3 && str != NULL; i++) {
 788         kver[i] = atoi(str);
 789         str = strtok(NULL, ".");
 790     }
 791
 792     if (KERNEL_VERSION(kver[0], kver[1], kver[2])
 793         < KERNEL_VERSION(K_MAJ, K_MIN1, K_MIN2)) {
 794         ALG_ERR("ASYNC AFALG not supported this kernel(%d.%d.%d)\n",
 795                  kver[0], kver[1], kver[2]);
 796         ALG_ERR("ASYNC AFALG requires kernel version %d.%d.%d or later\n",
 797                  K_MAJ, K_MIN1, K_MIN2);
 798         AFALGerr(AFALG_F_AFALG_CHK_PLATFORM,
 799                  AFALG_R_KERNEL_DOES_NOT_SUPPORT_ASYNC_AFALG);
 800         return 0;
 801     }
 802
 803     return 1;
 804 }
 805
 806 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
 807 static ENGINE *engine_afalg(void)
 808 {
 809     ENGINE *ret = ENGINE_new();
 810     if (ret == NULL)
 811         return NULL;
 812     if (!bind_afalg(ret)) {
 813         ENGINE_free(ret);
 814         return NULL;
 815     }
 816     return ret;
 817 }
 818
 819 void engine_load_afalg_internal(void)
 820 {
 821     ENGINE *toadd;
 822
 823     if (!afalg_chk_platform())
 824         return;
 825
 826     toadd = engine_afalg();
 827     if (toadd == NULL)
 828         return;
 829     ENGINE_add(toadd);
 830     ENGINE_free(toadd);
 831     ERR_clear_error();
 832 }
 833 # endif
 834
 835 static int afalg_init(ENGINE *e)
 836 {
 837     return 1;
 838 }
 839
 840 static int afalg_finish(ENGINE *e)
 841 {
 842     return 1;
 843 }
 844
 845 static int afalg_destroy(ENGINE *e)
 846 {
 847     ERR_unload_AFALG_strings();
 848     EVP_CIPHER_meth_free(_hidden_aes_128_cbc);
 849     _hidden_aes_128_cbc = NULL;
 850     return 1;
 851 }
 852
 853 #endif                          /* KERNEL VERSION */