engines/e_afalg.c

   1 /*
   2  * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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
   8  */
   9
  10 /* Required for vmsplice */
  11 #ifndef _GNU_SOURCE
  12 # define _GNU_SOURCE
  13 #endif
  14 #include <stdio.h>
  15 #include <string.h>
  16 #include <unistd.h>
  17
  18 #include <openssl/engine.h>
  19 #include <openssl/async.h>
  20 #include <openssl/err.h>
  21 #include "internal/nelem.h"
  22
  23 #include <sys/socket.h>
  24 #include <linux/version.h>
  25 #define K_MAJ   4
  26 #define K_MIN1  1
  27 #define K_MIN2  0
  28 #if LINUX_VERSION_CODE < KERNEL_VERSION(K_MAJ, K_MIN1, K_MIN2) || \
  29     !defined(AF_ALG)
  30 # ifndef PEDANTIC
  31 #  warning "AFALG ENGINE requires Kernel Headers >= 4.1.0"
  32 #  warning "Skipping Compilation of AFALG engine"
  33 # endif
  34 void engine_load_afalg_int(void);
  35 void engine_load_afalg_int(void)
  36 {
  37 }
  38 #else
  39
  40 # include <linux/if_alg.h>
  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"
  49 # include "e_afalg_err.c"
  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
  66 #define ALG_MAX_SALG_NAME       64
  67 #define ALG_MAX_SALG_TYPE       14
  68
  69 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
  70 void engine_load_afalg_int(void);
  71 # endif
  72
  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);
  77 static int afalg_create_sk(afalg_ctx *actx, const char *ciphertype,
  78                                 const char *ciphername);
  79 static int afalg_destroy(ENGINE *e);
  80 static int afalg_init(ENGINE *e);
  81 static int afalg_finish(ENGINE *e);
  82 static const EVP_CIPHER *afalg_aes_cbc(int nid);
  83 static cbc_handles *get_cipher_handle(int nid);
  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";
  95 static const char *engine_afalg_name = "AFALG engine support";
  96
  97 static int afalg_cipher_nids[] = {
  98     NID_aes_128_cbc,
  99     NID_aes_192_cbc,
 100     NID_aes_256_cbc,
 101 };
 102
 103 static cbc_handles cbc_handle[] = {{AES_KEY_SIZE_128, NULL},
 104                                     {AES_KEY_SIZE_192, NULL},
 105                                     {AES_KEY_SIZE_256, NULL}};
 106
 107 static ossl_inline int io_setup(unsigned n, aio_context_t *ctx)
 108 {
 109     return syscall(__NR_io_setup, n, ctx);
 110 }
 111
 112 static ossl_inline int eventfd(int n)
 113 {
 114     return syscall(__NR_eventfd2, n, 0);
 115 }
 116
 117 static ossl_inline int io_destroy(aio_context_t ctx)
 118 {
 119     return syscall(__NR_io_destroy, ctx);
 120 }
 121
 122 static ossl_inline int io_read(aio_context_t ctx, long n, struct iocb **iocb)
 123 {
 124     return syscall(__NR_io_submit, ctx, n, iocb);
 125 }
 126
 127 static ossl_inline int io_getevents(aio_context_t ctx, long min, long max,
 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;
 145     int ret;
 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(%d): ASYNC_get_wait_ctx error", __FILE__, __LINE__);
 152             return 0;
 153         }
 154         /* Get waitfd from ASYNC_WAIT_CTX if it is already set */
 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) {
 164                 ALG_PERR("%s(%d): Failed to get eventfd : ", __FILE__,
 165                          __LINE__);
 166                 AFALGerr(AFALG_F_AFALG_SETUP_ASYNC_EVENT_NOTIFICATION,
 167                          AFALG_R_EVENTFD_FAILED);
 168                 return 0;
 169             }
 170             ret = ASYNC_WAIT_CTX_set_wait_fd(waitctx, engine_afalg_id,
 171                                              aio->efd, custom,
 172                                              afalg_waitfd_cleanup);
 173             if (ret == 0) {
 174                 ALG_WARN("%s(%d): Failed to set wait fd", __FILE__, __LINE__);
 175                 close(aio->efd);
 176                 return 0;
 177             }
 178             /* make fd non-blocking in async mode */
 179             if (fcntl(aio->efd, F_SETFL, O_NONBLOCK) != 0) {
 180                 ALG_WARN("%s(%d): Failed to set event fd as NONBLOCKING",
 181                          __FILE__, __LINE__);
 182             }
 183         }
 184         aio->mode = MODE_ASYNC;
 185     } else {
 186         /* Sync mode */
 187         aio->efd = eventfd(0);
 188         if (aio->efd == -1) {
 189             ALG_PERR("%s(%d): Failed to get eventfd : ", __FILE__, __LINE__);
 190             AFALGerr(AFALG_F_AFALG_SETUP_ASYNC_EVENT_NOTIFICATION,
 191                      AFALG_R_EVENTFD_FAILED);
 192             return 0;
 193         }
 194         aio->mode = MODE_SYNC;
 195     }
 196     return 1;
 197 }
 198
 199 static int afalg_init_aio(afalg_aio *aio)
 200 {
 201     int r = -1;
 202
 203     /* Initialise for AIO */
 204     aio->aio_ctx = 0;
 205     r = io_setup(MAX_INFLIGHTS, &aio->aio_ctx);
 206     if (r < 0) {
 207         ALG_PERR("%s(%d): io_setup error : ", __FILE__, __LINE__);
 208         AFALGerr(AFALG_F_AFALG_INIT_AIO, AFALG_R_IO_SETUP_FAILED);
 209         return 0;
 210     }
 211
 212     memset(aio->cbt, 0, sizeof(aio->cbt));
 213     aio->efd = -1;
 214     aio->mode = MODE_UNINIT;
 215
 216     return 1;
 217 }
 218
 219 static int afalg_fin_cipher_aio(afalg_aio *aio, int sfd, unsigned char *buf,
 220                                 size_t len)
 221 {
 222     int r;
 223     int retry = 0;
 224     unsigned int done = 0;
 225     struct iocb *cb;
 226     struct timespec timeout;
 227     struct io_event events[MAX_INFLIGHTS];
 228     u_int64_t eval = 0;
 229
 230     timeout.tv_sec = 0;
 231     timeout.tv_nsec = 0;
 232
 233     /* if efd has not been initialised yet do it here */
 234     if (aio->mode == MODE_UNINIT) {
 235         r = afalg_setup_async_event_notification(aio);
 236         if (r == 0)
 237             return 0;
 238     }
 239
 240     cb = &(aio->cbt[0 % MAX_INFLIGHTS]);
 241     memset(cb, '\0', sizeof(*cb));
 242     cb->aio_fildes = sfd;
 243     cb->aio_lio_opcode = IOCB_CMD_PREAD;
 244     /*
 245      * The pointer has to be converted to unsigned value first to avoid
 246      * sign extension on cast to 64 bit value in 32-bit builds
 247      */
 248     cb->aio_buf = (size_t)buf;
 249     cb->aio_offset = 0;
 250     cb->aio_data = 0;
 251     cb->aio_nbytes = len;
 252     cb->aio_flags = IOCB_FLAG_RESFD;
 253     cb->aio_resfd = aio->efd;
 254
 255     /*
 256      * Perform AIO read on AFALG socket, this in turn performs an async
 257      * crypto operation in kernel space
 258      */
 259     r = io_read(aio->aio_ctx, 1, &cb);
 260     if (r < 0) {
 261         ALG_PWARN("%s(%d): io_read failed : ", __FILE__, __LINE__);
 262         return 0;
 263     }
 264
 265     do {
 266         /* While AIO read is being performed pause job */
 267         ASYNC_pause_job();
 268
 269         /* Check for completion of AIO read */
 270         r = read(aio->efd, &eval, sizeof(eval));
 271         if (r < 0) {
 272             if (errno == EAGAIN || errno == EWOULDBLOCK)
 273                 continue;
 274             ALG_PERR("%s(%d): read failed for event fd : ", __FILE__, __LINE__);
 275             return 0;
 276         } else if (r == 0 || eval <= 0) {
 277             ALG_WARN("%s(%d): eventfd read %d bytes, eval = %lu\n", __FILE__,
 278                      __LINE__, r, eval);
 279         }
 280         if (eval > 0) {
 281
 282             /* Get results of AIO read */
 283             r = io_getevents(aio->aio_ctx, 1, MAX_INFLIGHTS,
 284                              events, &timeout);
 285             if (r > 0) {
 286                 /*
 287                  * events.res indicates the actual status of the operation.
 288                  * Handle the error condition first.
 289                  */
 290                 if (events[0].res < 0) {
 291                     /*
 292                      * Underlying operation cannot be completed at the time
 293                      * of previous submission. Resubmit for the operation.
 294                      */
 295                     if (events[0].res == -EBUSY && retry++ < 3) {
 296                         r = io_read(aio->aio_ctx, 1, &cb);
 297                         if (r < 0) {
 298                             ALG_PERR("%s(%d): retry %d for io_read failed : ",
 299                                      __FILE__, __LINE__, retry);
 300                             return 0;
 301                         }
 302                         continue;
 303                     } else {
 304                         /*
 305                          * Retries exceed for -EBUSY or unrecoverable error
 306                          * condition for this instance of operation.
 307                          */
 308                         ALG_WARN
 309                             ("%s(%d): Crypto Operation failed with code %lld\n",
 310                              __FILE__, __LINE__, events[0].res);
 311                         return 0;
 312                     }
 313                 }
 314                 /* Operation successful. */
 315                 done = 1;
 316             } else if (r < 0) {
 317                 ALG_PERR("%s(%d): io_getevents failed : ", __FILE__, __LINE__);
 318                 return 0;
 319             } else {
 320                 ALG_WARN("%s(%d): io_geteventd read 0 bytes\n", __FILE__,
 321                          __LINE__);
 322             }
 323         }
 324     } while (!done);
 325
 326     return 1;
 327 }
 328
 329 static ossl_inline void afalg_set_op_sk(struct cmsghdr *cmsg,
 330                                    const ALG_OP_TYPE op)
 331 {
 332     cmsg->cmsg_level = SOL_ALG;
 333     cmsg->cmsg_type = ALG_SET_OP;
 334     cmsg->cmsg_len = CMSG_LEN(ALG_OP_LEN);
 335     memcpy(CMSG_DATA(cmsg), &op, ALG_OP_LEN);
 336 }
 337
 338 static void afalg_set_iv_sk(struct cmsghdr *cmsg, const unsigned char *iv,
 339                             const unsigned int len)
 340 {
 341     struct af_alg_iv *aiv;
 342
 343     cmsg->cmsg_level = SOL_ALG;
 344     cmsg->cmsg_type = ALG_SET_IV;
 345     cmsg->cmsg_len = CMSG_LEN(ALG_IV_LEN(len));
 346     aiv = (struct af_alg_iv *)CMSG_DATA(cmsg);
 347     aiv->ivlen = len;
 348     memcpy(aiv->iv, iv, len);
 349 }
 350
 351 static ossl_inline int afalg_set_key(afalg_ctx *actx, const unsigned char *key,
 352                                 const int klen)
 353 {
 354     int ret;
 355     ret = setsockopt(actx->bfd, SOL_ALG, ALG_SET_KEY, key, klen);
 356     if (ret < 0) {
 357         ALG_PERR("%s(%d): Failed to set socket option : ", __FILE__, __LINE__);
 358         AFALGerr(AFALG_F_AFALG_SET_KEY, AFALG_R_SOCKET_SET_KEY_FAILED);
 359         return 0;
 360     }
 361     return 1;
 362 }
 363
 364 static int afalg_create_sk(afalg_ctx *actx, const char *ciphertype,
 365                                 const char *ciphername)
 366 {
 367     struct sockaddr_alg sa;
 368     int r = -1;
 369
 370     actx->bfd = actx->sfd = -1;
 371
 372     memset(&sa, 0, sizeof(sa));
 373     sa.salg_family = AF_ALG;
 374     strncpy((char *) sa.salg_type, ciphertype, ALG_MAX_SALG_TYPE);
 375     sa.salg_type[ALG_MAX_SALG_TYPE-1] = '\0';
 376     strncpy((char *) sa.salg_name, ciphername, ALG_MAX_SALG_NAME);
 377     sa.salg_name[ALG_MAX_SALG_NAME-1] = '\0';
 378
 379     actx->bfd = socket(AF_ALG, SOCK_SEQPACKET, 0);
 380     if (actx->bfd == -1) {
 381         ALG_PERR("%s(%d): Failed to open socket : ", __FILE__, __LINE__);
 382         AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_CREATE_FAILED);
 383         goto err;
 384     }
 385
 386     r = bind(actx->bfd, (struct sockaddr *)&sa, sizeof(sa));
 387     if (r < 0) {
 388         ALG_PERR("%s(%d): Failed to bind socket : ", __FILE__, __LINE__);
 389         AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_BIND_FAILED);
 390         goto err;
 391     }
 392
 393     actx->sfd = accept(actx->bfd, NULL, 0);
 394     if (actx->sfd < 0) {
 395         ALG_PERR("%s(%d): Socket Accept Failed : ", __FILE__, __LINE__);
 396         AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_ACCEPT_FAILED);
 397         goto err;
 398     }
 399
 400     return 1;
 401
 402  err:
 403     if (actx->bfd >= 0)
 404         close(actx->bfd);
 405     if (actx->sfd >= 0)
 406         close(actx->sfd);
 407     actx->bfd = actx->sfd = -1;
 408     return 0;
 409 }
 410
 411 static int afalg_start_cipher_sk(afalg_ctx *actx, const unsigned char *in,
 412                                  size_t inl, const unsigned char *iv,
 413                                  unsigned int enc)
 414 {
 415     struct msghdr msg;
 416     struct cmsghdr *cmsg;
 417     struct iovec iov;
 418     ssize_t sbytes;
 419 # ifdef ALG_ZERO_COPY
 420     int ret;
 421 # endif
 422     char cbuf[CMSG_SPACE(ALG_IV_LEN(ALG_AES_IV_LEN)) + CMSG_SPACE(ALG_OP_LEN)];
 423
 424     memset(&msg, 0, sizeof(msg));
 425     memset(cbuf, 0, sizeof(cbuf));
 426     msg.msg_control = cbuf;
 427     msg.msg_controllen = sizeof(cbuf);
 428
 429     /*
 430      * cipher direction (i.e. encrypt or decrypt) and iv are sent to the
 431      * kernel as part of sendmsg()'s ancillary data
 432      */
 433     cmsg = CMSG_FIRSTHDR(&msg);
 434     afalg_set_op_sk(cmsg, enc);
 435     cmsg = CMSG_NXTHDR(&msg, cmsg);
 436     afalg_set_iv_sk(cmsg, iv, ALG_AES_IV_LEN);
 437
 438     /* iov that describes input data */
 439     iov.iov_base = (unsigned char *)in;
 440     iov.iov_len = inl;
 441
 442     msg.msg_flags = MSG_MORE;
 443
 444 # ifdef ALG_ZERO_COPY
 445     /*
 446      * ZERO_COPY mode
 447      * Works best when buffer is 4k aligned
 448      * OPENS: out of place processing (i.e. out != in)
 449      */
 450
 451     /* Input data is not sent as part of call to sendmsg() */
 452     msg.msg_iovlen = 0;
 453     msg.msg_iov = NULL;
 454
 455     /* Sendmsg() sends iv and cipher direction to the kernel */
 456     sbytes = sendmsg(actx->sfd, &msg, 0);
 457     if (sbytes < 0) {
 458         ALG_PERR("%s(%d): sendmsg failed for zero copy cipher operation : ",
 459                  __FILE__, __LINE__);
 460         return 0;
 461     }
 462
 463     /*
 464      * vmsplice and splice are used to pin the user space input buffer for
 465      * kernel space processing avoiding copys from user to kernel space
 466      */
 467     ret = vmsplice(actx->zc_pipe[1], &iov, 1, SPLICE_F_GIFT);
 468     if (ret < 0) {
 469         ALG_PERR("%s(%d): vmsplice failed : ", __FILE__, __LINE__);
 470         return 0;
 471     }
 472
 473     ret = splice(actx->zc_pipe[0], NULL, actx->sfd, NULL, inl, 0);
 474     if (ret < 0) {
 475         ALG_PERR("%s(%d): splice failed : ", __FILE__, __LINE__);
 476         return 0;
 477     }
 478 # else
 479     msg.msg_iovlen = 1;
 480     msg.msg_iov = &iov;
 481
 482     /* Sendmsg() sends iv, cipher direction and input data to the kernel */
 483     sbytes = sendmsg(actx->sfd, &msg, 0);
 484     if (sbytes < 0) {
 485         ALG_PERR("%s(%d): sendmsg failed for cipher operation : ", __FILE__,
 486                  __LINE__);
 487         return 0;
 488     }
 489
 490     if (sbytes != (ssize_t) inl) {
 491         ALG_WARN("Cipher operation send bytes %zd != inlen %zd\n", sbytes,
 492                 inl);
 493         return 0;
 494     }
 495 # endif
 496
 497     return 1;
 498 }
 499
 500 static int afalg_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 501                              const unsigned char *iv, int enc)
 502 {
 503     int ciphertype;
 504     int ret;
 505     afalg_ctx *actx;
 506     char ciphername[ALG_MAX_SALG_NAME];
 507
 508     if (ctx == NULL || key == NULL) {
 509         ALG_WARN("%s(%d): Null Parameter\n", __FILE__, __LINE__);
 510         return 0;
 511     }
 512
 513     if (EVP_CIPHER_CTX_cipher(ctx) == NULL) {
 514         ALG_WARN("%s(%d): Cipher object NULL\n", __FILE__, __LINE__);
 515         return 0;
 516     }
 517
 518     actx = EVP_CIPHER_CTX_get_cipher_data(ctx);
 519     if (actx == NULL) {
 520         ALG_WARN("%s(%d): Cipher data NULL\n", __FILE__, __LINE__);
 521         return 0;
 522     }
 523
 524     ciphertype = EVP_CIPHER_CTX_nid(ctx);
 525     switch (ciphertype) {
 526     case NID_aes_128_cbc:
 527     case NID_aes_192_cbc:
 528     case NID_aes_256_cbc:
 529         strncpy(ciphername, "cbc(aes)", ALG_MAX_SALG_NAME);
 530         break;
 531     default:
 532         ALG_WARN("%s(%d): Unsupported Cipher type %d\n", __FILE__, __LINE__,
 533                  ciphertype);
 534         return 0;
 535     }
 536     ciphername[ALG_MAX_SALG_NAME-1]='\0';
 537
 538     if (ALG_AES_IV_LEN != EVP_CIPHER_CTX_iv_length(ctx)) {
 539         ALG_WARN("%s(%d): Unsupported IV length :%d\n", __FILE__, __LINE__,
 540                  EVP_CIPHER_CTX_iv_length(ctx));
 541         return 0;
 542     }
 543
 544     /* Setup AFALG socket for crypto processing */
 545     ret = afalg_create_sk(actx, "skcipher", ciphername);
 546     if (ret < 1)
 547         return 0;
 548
 549
 550     ret = afalg_set_key(actx, key, EVP_CIPHER_CTX_key_length(ctx));
 551     if (ret < 1)
 552         goto err;
 553
 554     /* Setup AIO ctx to allow async AFALG crypto processing */
 555     if (afalg_init_aio(&actx->aio) == 0)
 556         goto err;
 557
 558 # ifdef ALG_ZERO_COPY
 559     pipe(actx->zc_pipe);
 560 # endif
 561
 562     actx->init_done = MAGIC_INIT_NUM;
 563
 564     return 1;
 565
 566 err:
 567     close(actx->sfd);
 568     close(actx->bfd);
 569     return 0;
 570 }
 571
 572 static int afalg_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 573                            const unsigned char *in, size_t inl)
 574 {
 575     afalg_ctx *actx;
 576     int ret;
 577     char nxtiv[ALG_AES_IV_LEN] = { 0 };
 578
 579     if (ctx == NULL || out == NULL || in == NULL) {
 580         ALG_WARN("NULL parameter passed to function %s(%d)\n", __FILE__,
 581                  __LINE__);
 582         return 0;
 583     }
 584
 585     actx = (afalg_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx);
 586     if (actx == NULL || actx->init_done != MAGIC_INIT_NUM) {
 587         ALG_WARN("%s afalg ctx passed\n",
 588                  ctx == NULL ? "NULL" : "Uninitialised");
 589         return 0;
 590     }
 591
 592     /*
 593      * set iv now for decrypt operation as the input buffer can be
 594      * overwritten for inplace operation where in = out.
 595      */
 596     if (EVP_CIPHER_CTX_encrypting(ctx) == 0) {
 597         memcpy(nxtiv, in + (inl - ALG_AES_IV_LEN), ALG_AES_IV_LEN);
 598     }
 599
 600     /* Send input data to kernel space */
 601     ret = afalg_start_cipher_sk(actx, (unsigned char *)in, inl,
 602                                 EVP_CIPHER_CTX_iv(ctx),
 603                                 EVP_CIPHER_CTX_encrypting(ctx));
 604     if (ret < 1) {
 605         return 0;
 606     }
 607
 608     /* Perform async crypto operation in kernel space */
 609     ret = afalg_fin_cipher_aio(&actx->aio, actx->sfd, out, inl);
 610     if (ret < 1)
 611         return 0;
 612
 613     if (EVP_CIPHER_CTX_encrypting(ctx)) {
 614         memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), out + (inl - ALG_AES_IV_LEN),
 615                ALG_AES_IV_LEN);
 616     } else {
 617         memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), nxtiv, ALG_AES_IV_LEN);
 618     }
 619
 620     return 1;
 621 }
 622
 623 static int afalg_cipher_cleanup(EVP_CIPHER_CTX *ctx)
 624 {
 625     afalg_ctx *actx;
 626
 627     if (ctx == NULL) {
 628         ALG_WARN("NULL parameter passed to function %s(%d)\n", __FILE__,
 629                  __LINE__);
 630         return 0;
 631     }
 632
 633     actx = (afalg_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx);
 634     if (actx == NULL || actx->init_done != MAGIC_INIT_NUM) {
 635         ALG_WARN("%s afalg ctx passed\n",
 636                  ctx == NULL ? "NULL" : "Uninitialised");
 637         return 0;
 638     }
 639
 640     close(actx->sfd);
 641     close(actx->bfd);
 642 # ifdef ALG_ZERO_COPY
 643     close(actx->zc_pipe[0]);
 644     close(actx->zc_pipe[1]);
 645 # endif
 646     /* close efd in sync mode, async mode is closed in afalg_waitfd_cleanup() */
 647     if (actx->aio.mode == MODE_SYNC)
 648         close(actx->aio.efd);
 649     io_destroy(actx->aio.aio_ctx);
 650
 651     return 1;
 652 }
 653
 654 static cbc_handles *get_cipher_handle(int nid)
 655 {
 656     switch (nid) {
 657     case NID_aes_128_cbc:
 658         return &cbc_handle[AES_CBC_128];
 659     case NID_aes_192_cbc:
 660         return &cbc_handle[AES_CBC_192];
 661     case NID_aes_256_cbc:
 662         return &cbc_handle[AES_CBC_256];
 663     default:
 664         return NULL;
 665     }
 666 }
 667
 668 static const EVP_CIPHER *afalg_aes_cbc(int nid)
 669 {
 670     cbc_handles *cipher_handle = get_cipher_handle(nid);
 671     if (cipher_handle->_hidden == NULL
 672         && ((cipher_handle->_hidden =
 673          EVP_CIPHER_meth_new(nid,
 674                              AES_BLOCK_SIZE,
 675                              cipher_handle->key_size)) == NULL
 676         || !EVP_CIPHER_meth_set_iv_length(cipher_handle->_hidden,
 677                                           AES_IV_LEN)
 678         || !EVP_CIPHER_meth_set_flags(cipher_handle->_hidden,
 679                                       EVP_CIPH_CBC_MODE |
 680                                       EVP_CIPH_FLAG_DEFAULT_ASN1)
 681         || !EVP_CIPHER_meth_set_init(cipher_handle->_hidden,
 682                                      afalg_cipher_init)
 683         || !EVP_CIPHER_meth_set_do_cipher(cipher_handle->_hidden,
 684                                           afalg_do_cipher)
 685         || !EVP_CIPHER_meth_set_cleanup(cipher_handle->_hidden,
 686                                         afalg_cipher_cleanup)
 687         || !EVP_CIPHER_meth_set_impl_ctx_size(cipher_handle->_hidden,
 688                                               sizeof(afalg_ctx)))) {
 689         EVP_CIPHER_meth_free(cipher_handle->_hidden);
 690         cipher_handle->_hidden= NULL;
 691     }
 692     return cipher_handle->_hidden;
 693 }
 694
 695 static int afalg_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
 696                          const int **nids, int nid)
 697 {
 698     int r = 1;
 699
 700     if (cipher == NULL) {
 701         *nids = afalg_cipher_nids;
 702         return (sizeof(afalg_cipher_nids) / sizeof(afalg_cipher_nids[0]));
 703     }
 704
 705     switch (nid) {
 706     case NID_aes_128_cbc:
 707     case NID_aes_192_cbc:
 708     case NID_aes_256_cbc:
 709         *cipher = afalg_aes_cbc(nid);
 710         break;
 711     default:
 712         *cipher = NULL;
 713         r = 0;
 714     }
 715     return r;
 716 }
 717
 718 static int bind_afalg(ENGINE *e)
 719 {
 720     /* Ensure the afalg error handling is set up */
 721     unsigned short i;
 722     ERR_load_AFALG_strings();
 723
 724     if (!ENGINE_set_id(e, engine_afalg_id)
 725         || !ENGINE_set_name(e, engine_afalg_name)
 726         || !ENGINE_set_destroy_function(e, afalg_destroy)
 727         || !ENGINE_set_init_function(e, afalg_init)
 728         || !ENGINE_set_finish_function(e, afalg_finish)) {
 729         AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED);
 730         return 0;
 731     }
 732
 733     /*
 734      * Create _hidden_aes_xxx_cbc by calling afalg_aes_xxx_cbc
 735      * now, as bind_aflag can only be called by one thread at a
 736      * time.
 737      */
 738     for(i = 0; i < OSSL_NELEM(afalg_cipher_nids); i++) {
 739         if (afalg_aes_cbc(afalg_cipher_nids[i]) == NULL) {
 740             AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED);
 741             return 0;
 742         }
 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     int sock;
 777     char *str;
 778     struct utsname ut;
 779
 780     ret = uname(&ut);
 781     if (ret != 0) {
 782         AFALGerr(AFALG_F_AFALG_CHK_PLATFORM,
 783                  AFALG_R_FAILED_TO_GET_PLATFORM_INFO);
 784         return 0;
 785     }
 786
 787     str = strtok(ut.release, ".");
 788     for (i = 0; i < 3 && str != NULL; i++) {
 789         kver[i] = atoi(str);
 790         str = strtok(NULL, ".");
 791     }
 792
 793     if (KERNEL_VERSION(kver[0], kver[1], kver[2])
 794         < KERNEL_VERSION(K_MAJ, K_MIN1, K_MIN2)) {
 795         ALG_ERR("ASYNC AFALG not supported this kernel(%d.%d.%d)\n",
 796                  kver[0], kver[1], kver[2]);
 797         ALG_ERR("ASYNC AFALG requires kernel version %d.%d.%d or later\n",
 798                  K_MAJ, K_MIN1, K_MIN2);
 799         AFALGerr(AFALG_F_AFALG_CHK_PLATFORM,
 800                  AFALG_R_KERNEL_DOES_NOT_SUPPORT_ASYNC_AFALG);
 801         return 0;
 802     }
 803
 804     /* Test if we can actually create an AF_ALG socket */
 805     sock = socket(AF_ALG, SOCK_SEQPACKET, 0);
 806     if (sock == -1) {
 807         AFALGerr(AFALG_F_AFALG_CHK_PLATFORM, AFALG_R_SOCKET_CREATE_FAILED);
 808         return 0;
 809     }
 810     close(sock);
 811
 812     return 1;
 813 }
 814
 815 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
 816 static ENGINE *engine_afalg(void)
 817 {
 818     ENGINE *ret = ENGINE_new();
 819     if (ret == NULL)
 820         return NULL;
 821     if (!bind_afalg(ret)) {
 822         ENGINE_free(ret);
 823         return NULL;
 824     }
 825     return ret;
 826 }
 827
 828 void engine_load_afalg_int(void)
 829 {
 830     ENGINE *toadd;
 831
 832     if (!afalg_chk_platform())
 833         return;
 834
 835     toadd = engine_afalg();
 836     if (toadd == NULL)
 837         return;
 838     ENGINE_add(toadd);
 839     ENGINE_free(toadd);
 840     ERR_clear_error();
 841 }
 842 # endif
 843
 844 static int afalg_init(ENGINE *e)
 845 {
 846     return 1;
 847 }
 848
 849 static int afalg_finish(ENGINE *e)
 850 {
 851     return 1;
 852 }
 853
 854 static int free_cbc(void)
 855 {
 856     short unsigned int i;
 857     for(i = 0; i < OSSL_NELEM(afalg_cipher_nids); i++) {
 858         EVP_CIPHER_meth_free(cbc_handle[i]._hidden);
 859         cbc_handle[i]._hidden = NULL;
 860     }
 861     return 1;
 862 }
 863
 864 static int afalg_destroy(ENGINE *e)
 865 {
 866     ERR_unload_AFALG_strings();
 867     free_cbc();
 868     return 1;
 869 }
 870
 871 #endif                          /* KERNEL VERSION */