engines/e_afalg.c

   1 /*
   2  * Copyright 2016-2021 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 /* We need to use some deprecated APIs */
  11 #define OPENSSL_SUPPRESS_DEPRECATED
  12
  13 /* Required for vmsplice */
  14 #ifndef _GNU_SOURCE
  15 # define _GNU_SOURCE
  16 #endif
  17 #include <stdio.h>
  18 #include <string.h>
  19 #include <unistd.h>
  20
  21 #include <openssl/engine.h>
  22 #include <openssl/async.h>
  23 #include <openssl/err.h>
  24 #include "internal/nelem.h"
  25
  26 #include <sys/socket.h>
  27 #include <linux/version.h>
  28 #define K_MAJ   4
  29 #define K_MIN1  1
  30 #define K_MIN2  0
  31 #if LINUX_VERSION_CODE < KERNEL_VERSION(K_MAJ, K_MIN1, K_MIN2) || \
  32     !defined(AF_ALG)
  33 # ifndef PEDANTIC
  34 #  warning "AFALG ENGINE requires Kernel Headers >= 4.1.0"
  35 #  warning "Skipping Compilation of AFALG engine"
  36 # endif
  37 void engine_load_afalg_int(void);
  38 void engine_load_afalg_int(void)
  39 {
  40 }
  41 #else
  42
  43 # include <linux/if_alg.h>
  44 # include <fcntl.h>
  45 # include <sys/utsname.h>
  46
  47 # include <linux/aio_abi.h>
  48 # include <sys/syscall.h>
  49 # include <errno.h>
  50
  51 # include "e_afalg.h"
  52 # include "e_afalg_err.c"
  53
  54 # ifndef SOL_ALG
  55 #  define SOL_ALG 279
  56 # endif
  57
  58 # ifdef ALG_ZERO_COPY
  59 #  ifndef SPLICE_F_GIFT
  60 #   define SPLICE_F_GIFT    (0x08)
  61 #  endif
  62 # endif
  63
  64 # define ALG_AES_IV_LEN 16
  65 # define ALG_IV_LEN(len) (sizeof(struct af_alg_iv) + (len))
  66 # define ALG_OP_TYPE     unsigned int
  67 # define ALG_OP_LEN      (sizeof(ALG_OP_TYPE))
  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 /* A version of 'struct timespec' with 32-bit time_t and nanoseconds.  */
 128 struct __timespec32
 129 {
 130   __kernel_long_t tv_sec;
 131   __kernel_long_t tv_nsec;
 132 };
 133
 134 static ossl_inline int io_getevents(aio_context_t ctx, long min, long max,
 135                                struct io_event *events,
 136                                struct timespec *timeout)
 137 {
 138 #if defined(__NR_io_pgetevents_time64)
 139     /* Check if we are a 32-bit architecture with a 64-bit time_t */
 140     if (sizeof(*timeout) != sizeof(struct __timespec32)) {
 141         int ret = syscall(__NR_io_pgetevents_time64, ctx, min, max, events,
 142                           timeout, NULL);
 143         if (ret == 0 || errno != ENOSYS)
 144             return ret;
 145     }
 146 #endif
 147
 148 #if defined(__NR_io_getevents)
 149     if (sizeof(*timeout) == sizeof(struct __timespec32))
 150         /*
 151          * time_t matches our architecture length, we can just use
 152          * __NR_io_getevents
 153          */
 154         return syscall(__NR_io_getevents, ctx, min, max, events, timeout);
 155     else {
 156         /*
 157          * We don't have __NR_io_pgetevents_time64, but we are using a
 158          * 64-bit time_t on a 32-bit architecture. If we can fit the
 159          * timeout value in a 32-bit time_t, then let's do that
 160          * and then use the __NR_io_getevents syscall.
 161          */
 162         if (timeout && timeout->tv_sec == (long)timeout->tv_sec) {
 163             struct __timespec32 ts32;
 164
 165             ts32.tv_sec = (__kernel_long_t) timeout->tv_sec;
 166             ts32.tv_nsec = (__kernel_long_t) timeout->tv_nsec;
 167
 168             return syscall(__NR_io_getevents, ctx, min, max, events, ts32);
 169         } else {
 170             return syscall(__NR_io_getevents, ctx, min, max, events, NULL);
 171         }
 172     }
 173 #endif
 174
 175     errno = ENOSYS;
 176     return -1;
 177 }
 178
 179 static void afalg_waitfd_cleanup(ASYNC_WAIT_CTX *ctx, const void *key,
 180                                  OSSL_ASYNC_FD waitfd, void *custom)
 181 {
 182     close(waitfd);
 183 }
 184
 185 static int afalg_setup_async_event_notification(afalg_aio *aio)
 186 {
 187     ASYNC_JOB *job;
 188     ASYNC_WAIT_CTX *waitctx;
 189     void *custom = NULL;
 190     int ret;
 191
 192     if ((job = ASYNC_get_current_job()) != NULL) {
 193         /* Async mode */
 194         waitctx = ASYNC_get_wait_ctx(job);
 195         if (waitctx == NULL) {
 196             ALG_WARN("%s(%d): ASYNC_get_wait_ctx error", __FILE__, __LINE__);
 197             return 0;
 198         }
 199         /* Get waitfd from ASYNC_WAIT_CTX if it is already set */
 200         ret = ASYNC_WAIT_CTX_get_fd(waitctx, engine_afalg_id,
 201                                     &aio->efd, &custom);
 202         if (ret == 0) {
 203             /*
 204              * waitfd is not set in ASYNC_WAIT_CTX, create a new one
 205              * and set it. efd will be signaled when AIO operation completes
 206              */
 207             aio->efd = eventfd(0);
 208             if (aio->efd == -1) {
 209                 ALG_PERR("%s(%d): Failed to get eventfd : ", __FILE__,
 210                          __LINE__);
 211                 AFALGerr(AFALG_F_AFALG_SETUP_ASYNC_EVENT_NOTIFICATION,
 212                          AFALG_R_EVENTFD_FAILED);
 213                 return 0;
 214             }
 215             ret = ASYNC_WAIT_CTX_set_wait_fd(waitctx, engine_afalg_id,
 216                                              aio->efd, custom,
 217                                              afalg_waitfd_cleanup);
 218             if (ret == 0) {
 219                 ALG_WARN("%s(%d): Failed to set wait fd", __FILE__, __LINE__);
 220                 close(aio->efd);
 221                 return 0;
 222             }
 223             /* make fd non-blocking in async mode */
 224             if (fcntl(aio->efd, F_SETFL, O_NONBLOCK) != 0) {
 225                 ALG_WARN("%s(%d): Failed to set event fd as NONBLOCKING",
 226                          __FILE__, __LINE__);
 227             }
 228         }
 229         aio->mode = MODE_ASYNC;
 230     } else {
 231         /* Sync mode */
 232         aio->efd = eventfd(0);
 233         if (aio->efd == -1) {
 234             ALG_PERR("%s(%d): Failed to get eventfd : ", __FILE__, __LINE__);
 235             AFALGerr(AFALG_F_AFALG_SETUP_ASYNC_EVENT_NOTIFICATION,
 236                      AFALG_R_EVENTFD_FAILED);
 237             return 0;
 238         }
 239         aio->mode = MODE_SYNC;
 240     }
 241     return 1;
 242 }
 243
 244 static int afalg_init_aio(afalg_aio *aio)
 245 {
 246     int r = -1;
 247
 248     /* Initialise for AIO */
 249     aio->aio_ctx = 0;
 250     r = io_setup(MAX_INFLIGHTS, &aio->aio_ctx);
 251     if (r < 0) {
 252         ALG_PERR("%s(%d): io_setup error : ", __FILE__, __LINE__);
 253         AFALGerr(AFALG_F_AFALG_INIT_AIO, AFALG_R_IO_SETUP_FAILED);
 254         return 0;
 255     }
 256
 257     memset(aio->cbt, 0, sizeof(aio->cbt));
 258     aio->efd = -1;
 259     aio->mode = MODE_UNINIT;
 260
 261     return 1;
 262 }
 263
 264 static int afalg_fin_cipher_aio(afalg_aio *aio, int sfd, unsigned char *buf,
 265                                 size_t len)
 266 {
 267     int r;
 268     int retry = 0;
 269     unsigned int done = 0;
 270     struct iocb *cb;
 271     struct timespec timeout;
 272     struct io_event events[MAX_INFLIGHTS];
 273     u_int64_t eval = 0;
 274
 275     timeout.tv_sec = 0;
 276     timeout.tv_nsec = 0;
 277
 278     /* if efd has not been initialised yet do it here */
 279     if (aio->mode == MODE_UNINIT) {
 280         r = afalg_setup_async_event_notification(aio);
 281         if (r == 0)
 282             return 0;
 283     }
 284
 285     cb = &(aio->cbt[0 % MAX_INFLIGHTS]);
 286     memset(cb, '\0', sizeof(*cb));
 287     cb->aio_fildes = sfd;
 288     cb->aio_lio_opcode = IOCB_CMD_PREAD;
 289     /*
 290      * The pointer has to be converted to unsigned value first to avoid
 291      * sign extension on cast to 64 bit value in 32-bit builds
 292      */
 293     cb->aio_buf = (size_t)buf;
 294     cb->aio_offset = 0;
 295     cb->aio_data = 0;
 296     cb->aio_nbytes = len;
 297     cb->aio_flags = IOCB_FLAG_RESFD;
 298     cb->aio_resfd = aio->efd;
 299
 300     /*
 301      * Perform AIO read on AFALG socket, this in turn performs an async
 302      * crypto operation in kernel space
 303      */
 304     r = io_read(aio->aio_ctx, 1, &cb);
 305     if (r < 0) {
 306         ALG_PWARN("%s(%d): io_read failed : ", __FILE__, __LINE__);
 307         return 0;
 308     }
 309
 310     do {
 311         /* While AIO read is being performed pause job */
 312         ASYNC_pause_job();
 313
 314         /* Check for completion of AIO read */
 315         r = read(aio->efd, &eval, sizeof(eval));
 316         if (r < 0) {
 317             if (errno == EAGAIN || errno == EWOULDBLOCK)
 318                 continue;
 319             ALG_PERR("%s(%d): read failed for event fd : ", __FILE__, __LINE__);
 320             return 0;
 321         } else if (r == 0 || eval <= 0) {
 322             ALG_WARN("%s(%d): eventfd read %d bytes, eval = %lu\n", __FILE__,
 323                      __LINE__, r, eval);
 324         }
 325         if (eval > 0) {
 326
 327 #ifdef OSSL_SANITIZE_MEMORY
 328             /*
 329              * In a memory sanitiser build, the changes to memory made by the
 330              * system call aren't reliably detected.  By initialising the
 331              * memory here, the sanitiser is told that they are okay.
 332              */
 333             memset(events, 0, sizeof(events));
 334 #endif
 335
 336             /* Get results of AIO read */
 337             r = io_getevents(aio->aio_ctx, 1, MAX_INFLIGHTS,
 338                              events, &timeout);
 339             if (r > 0) {
 340                 /*
 341                  * events.res indicates the actual status of the operation.
 342                  * Handle the error condition first.
 343                  */
 344                 if (events[0].res < 0) {
 345                     /*
 346                      * Underlying operation cannot be completed at the time
 347                      * of previous submission. Resubmit for the operation.
 348                      */
 349                     if (events[0].res == -EBUSY && retry++ < 3) {
 350                         r = io_read(aio->aio_ctx, 1, &cb);
 351                         if (r < 0) {
 352                             ALG_PERR("%s(%d): retry %d for io_read failed : ",
 353                                      __FILE__, __LINE__, retry);
 354                             return 0;
 355                         }
 356                         continue;
 357                     } else {
 358                         /*
 359                          * Retries exceed for -EBUSY or unrecoverable error
 360                          * condition for this instance of operation.
 361                          */
 362                         ALG_WARN
 363                             ("%s(%d): Crypto Operation failed with code %lld\n",
 364                              __FILE__, __LINE__, events[0].res);
 365                         return 0;
 366                     }
 367                 }
 368                 /* Operation successful. */
 369                 done = 1;
 370             } else if (r < 0) {
 371                 ALG_PERR("%s(%d): io_getevents failed : ", __FILE__, __LINE__);
 372                 return 0;
 373             } else {
 374                 ALG_WARN("%s(%d): io_geteventd read 0 bytes\n", __FILE__,
 375                          __LINE__);
 376             }
 377         }
 378     } while (!done);
 379
 380     return 1;
 381 }
 382
 383 static ossl_inline void afalg_set_op_sk(struct cmsghdr *cmsg,
 384                                    const ALG_OP_TYPE op)
 385 {
 386     cmsg->cmsg_level = SOL_ALG;
 387     cmsg->cmsg_type = ALG_SET_OP;
 388     cmsg->cmsg_len = CMSG_LEN(ALG_OP_LEN);
 389     memcpy(CMSG_DATA(cmsg), &op, ALG_OP_LEN);
 390 }
 391
 392 static void afalg_set_iv_sk(struct cmsghdr *cmsg, const unsigned char *iv,
 393                             const unsigned int len)
 394 {
 395     struct af_alg_iv *aiv;
 396
 397     cmsg->cmsg_level = SOL_ALG;
 398     cmsg->cmsg_type = ALG_SET_IV;
 399     cmsg->cmsg_len = CMSG_LEN(ALG_IV_LEN(len));
 400     aiv = (struct af_alg_iv *)CMSG_DATA(cmsg);
 401     aiv->ivlen = len;
 402     memcpy(aiv->iv, iv, len);
 403 }
 404
 405 static ossl_inline int afalg_set_key(afalg_ctx *actx, const unsigned char *key,
 406                                 const int klen)
 407 {
 408     int ret;
 409     ret = setsockopt(actx->bfd, SOL_ALG, ALG_SET_KEY, key, klen);
 410     if (ret < 0) {
 411         ALG_PERR("%s(%d): Failed to set socket option : ", __FILE__, __LINE__);
 412         AFALGerr(AFALG_F_AFALG_SET_KEY, AFALG_R_SOCKET_SET_KEY_FAILED);
 413         return 0;
 414     }
 415     return 1;
 416 }
 417
 418 static int afalg_create_sk(afalg_ctx *actx, const char *ciphertype,
 419                                 const char *ciphername)
 420 {
 421     struct sockaddr_alg sa;
 422     int r = -1;
 423
 424     actx->bfd = actx->sfd = -1;
 425
 426     memset(&sa, 0, sizeof(sa));
 427     sa.salg_family = AF_ALG;
 428     OPENSSL_strlcpy((char *) sa.salg_type, ciphertype, sizeof(sa.salg_type));
 429     OPENSSL_strlcpy((char *) sa.salg_name, ciphername, sizeof(sa.salg_name));
 430
 431     actx->bfd = socket(AF_ALG, SOCK_SEQPACKET, 0);
 432     if (actx->bfd == -1) {
 433         ALG_PERR("%s(%d): Failed to open socket : ", __FILE__, __LINE__);
 434         AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_CREATE_FAILED);
 435         goto err;
 436     }
 437
 438     r = bind(actx->bfd, (struct sockaddr *)&sa, sizeof(sa));
 439     if (r < 0) {
 440         ALG_PERR("%s(%d): Failed to bind socket : ", __FILE__, __LINE__);
 441         AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_BIND_FAILED);
 442         goto err;
 443     }
 444
 445     actx->sfd = accept(actx->bfd, NULL, 0);
 446     if (actx->sfd < 0) {
 447         ALG_PERR("%s(%d): Socket Accept Failed : ", __FILE__, __LINE__);
 448         AFALGerr(AFALG_F_AFALG_CREATE_SK, AFALG_R_SOCKET_ACCEPT_FAILED);
 449         goto err;
 450     }
 451
 452     return 1;
 453
 454  err:
 455     if (actx->bfd >= 0)
 456         close(actx->bfd);
 457     if (actx->sfd >= 0)
 458         close(actx->sfd);
 459     actx->bfd = actx->sfd = -1;
 460     return 0;
 461 }
 462
 463 static int afalg_start_cipher_sk(afalg_ctx *actx, const unsigned char *in,
 464                                  size_t inl, const unsigned char *iv,
 465                                  unsigned int enc)
 466 {
 467     struct msghdr msg;
 468     struct cmsghdr *cmsg;
 469     struct iovec iov;
 470     ssize_t sbytes;
 471 # ifdef ALG_ZERO_COPY
 472     int ret;
 473 # endif
 474     char cbuf[CMSG_SPACE(ALG_IV_LEN(ALG_AES_IV_LEN)) + CMSG_SPACE(ALG_OP_LEN)];
 475
 476     memset(&msg, 0, sizeof(msg));
 477     memset(cbuf, 0, sizeof(cbuf));
 478     msg.msg_control = cbuf;
 479     msg.msg_controllen = sizeof(cbuf);
 480
 481     /*
 482      * cipher direction (i.e. encrypt or decrypt) and iv are sent to the
 483      * kernel as part of sendmsg()'s ancillary data
 484      */
 485     cmsg = CMSG_FIRSTHDR(&msg);
 486     afalg_set_op_sk(cmsg, enc);
 487     cmsg = CMSG_NXTHDR(&msg, cmsg);
 488     afalg_set_iv_sk(cmsg, iv, ALG_AES_IV_LEN);
 489
 490     /* iov that describes input data */
 491     iov.iov_base = (unsigned char *)in;
 492     iov.iov_len = inl;
 493
 494     msg.msg_flags = MSG_MORE;
 495
 496 # ifdef ALG_ZERO_COPY
 497     /*
 498      * ZERO_COPY mode
 499      * Works best when buffer is 4k aligned
 500      * OPENS: out of place processing (i.e. out != in)
 501      */
 502
 503     /* Input data is not sent as part of call to sendmsg() */
 504     msg.msg_iovlen = 0;
 505     msg.msg_iov = NULL;
 506
 507     /* Sendmsg() sends iv and cipher direction to the kernel */
 508     sbytes = sendmsg(actx->sfd, &msg, 0);
 509     if (sbytes < 0) {
 510         ALG_PERR("%s(%d): sendmsg failed for zero copy cipher operation : ",
 511                  __FILE__, __LINE__);
 512         return 0;
 513     }
 514
 515     /*
 516      * vmsplice and splice are used to pin the user space input buffer for
 517      * kernel space processing avoiding copies from user to kernel space
 518      */
 519     ret = vmsplice(actx->zc_pipe[1], &iov, 1, SPLICE_F_GIFT);
 520     if (ret < 0) {
 521         ALG_PERR("%s(%d): vmsplice failed : ", __FILE__, __LINE__);
 522         return 0;
 523     }
 524
 525     ret = splice(actx->zc_pipe[0], NULL, actx->sfd, NULL, inl, 0);
 526     if (ret < 0) {
 527         ALG_PERR("%s(%d): splice failed : ", __FILE__, __LINE__);
 528         return 0;
 529     }
 530 # else
 531     msg.msg_iovlen = 1;
 532     msg.msg_iov = &iov;
 533
 534     /* Sendmsg() sends iv, cipher direction and input data to the kernel */
 535     sbytes = sendmsg(actx->sfd, &msg, 0);
 536     if (sbytes < 0) {
 537         ALG_PERR("%s(%d): sendmsg failed for cipher operation : ", __FILE__,
 538                  __LINE__);
 539         return 0;
 540     }
 541
 542     if (sbytes != (ssize_t) inl) {
 543         ALG_WARN("Cipher operation send bytes %zd != inlen %zd\n", sbytes,
 544                 inl);
 545         return 0;
 546     }
 547 # endif
 548
 549     return 1;
 550 }
 551
 552 static int afalg_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 553                              const unsigned char *iv, int enc)
 554 {
 555     int ciphertype;
 556     int ret, len;
 557     afalg_ctx *actx;
 558     const char *ciphername;
 559
 560     if (ctx == NULL || key == NULL) {
 561         ALG_WARN("%s(%d): Null Parameter\n", __FILE__, __LINE__);
 562         return 0;
 563     }
 564
 565     if (EVP_CIPHER_CTX_get0_cipher(ctx) == NULL) {
 566         ALG_WARN("%s(%d): Cipher object NULL\n", __FILE__, __LINE__);
 567         return 0;
 568     }
 569
 570     actx = EVP_CIPHER_CTX_get_cipher_data(ctx);
 571     if (actx == NULL) {
 572         ALG_WARN("%s(%d): Cipher data NULL\n", __FILE__, __LINE__);
 573         return 0;
 574     }
 575
 576     ciphertype = EVP_CIPHER_CTX_get_nid(ctx);
 577     switch (ciphertype) {
 578     case NID_aes_128_cbc:
 579     case NID_aes_192_cbc:
 580     case NID_aes_256_cbc:
 581         ciphername = "cbc(aes)";
 582         break;
 583     default:
 584         ALG_WARN("%s(%d): Unsupported Cipher type %d\n", __FILE__, __LINE__,
 585                  ciphertype);
 586         return 0;
 587     }
 588
 589     if (ALG_AES_IV_LEN != EVP_CIPHER_CTX_get_iv_length(ctx)) {
 590         ALG_WARN("%s(%d): Unsupported IV length :%d\n", __FILE__, __LINE__,
 591                  EVP_CIPHER_CTX_get_iv_length(ctx));
 592         return 0;
 593     }
 594
 595     /* Setup AFALG socket for crypto processing */
 596     ret = afalg_create_sk(actx, "skcipher", ciphername);
 597     if (ret < 1)
 598         return 0;
 599
 600     if ((len = EVP_CIPHER_CTX_get_key_length(ctx)) <= 0)
 601         goto err;
 602     ret = afalg_set_key(actx, key, len);
 603     if (ret < 1)
 604         goto err;
 605
 606     /* Setup AIO ctx to allow async AFALG crypto processing */
 607     if (afalg_init_aio(&actx->aio) == 0)
 608         goto err;
 609
 610 # ifdef ALG_ZERO_COPY
 611     pipe(actx->zc_pipe);
 612 # endif
 613
 614     actx->init_done = MAGIC_INIT_NUM;
 615
 616     return 1;
 617
 618 err:
 619     close(actx->sfd);
 620     close(actx->bfd);
 621     return 0;
 622 }
 623
 624 static int afalg_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 625                            const unsigned char *in, size_t inl)
 626 {
 627     afalg_ctx *actx;
 628     int ret;
 629     char nxtiv[ALG_AES_IV_LEN] = { 0 };
 630
 631     if (ctx == NULL || out == NULL || in == NULL) {
 632         ALG_WARN("NULL parameter passed to function %s(%d)\n", __FILE__,
 633                  __LINE__);
 634         return 0;
 635     }
 636
 637     actx = (afalg_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx);
 638     if (actx == NULL || actx->init_done != MAGIC_INIT_NUM) {
 639         ALG_WARN("%s afalg ctx passed\n",
 640                  ctx == NULL ? "NULL" : "Uninitialised");
 641         return 0;
 642     }
 643
 644     /*
 645      * set iv now for decrypt operation as the input buffer can be
 646      * overwritten for inplace operation where in = out.
 647      */
 648     if (EVP_CIPHER_CTX_is_encrypting(ctx) == 0) {
 649         memcpy(nxtiv, in + (inl - ALG_AES_IV_LEN), ALG_AES_IV_LEN);
 650     }
 651
 652     /* Send input data to kernel space */
 653     ret = afalg_start_cipher_sk(actx, (unsigned char *)in, inl,
 654                                 EVP_CIPHER_CTX_iv(ctx),
 655                                 EVP_CIPHER_CTX_is_encrypting(ctx));
 656     if (ret < 1) {
 657         return 0;
 658     }
 659
 660     /* Perform async crypto operation in kernel space */
 661     ret = afalg_fin_cipher_aio(&actx->aio, actx->sfd, out, inl);
 662     if (ret < 1)
 663         return 0;
 664
 665     if (EVP_CIPHER_CTX_is_encrypting(ctx)) {
 666         memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), out + (inl - ALG_AES_IV_LEN),
 667                ALG_AES_IV_LEN);
 668     } else {
 669         memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), nxtiv, ALG_AES_IV_LEN);
 670     }
 671
 672     return 1;
 673 }
 674
 675 static int afalg_cipher_cleanup(EVP_CIPHER_CTX *ctx)
 676 {
 677     afalg_ctx *actx;
 678
 679     if (ctx == NULL) {
 680         ALG_WARN("NULL parameter passed to function %s(%d)\n", __FILE__,
 681                  __LINE__);
 682         return 0;
 683     }
 684
 685     actx = (afalg_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx);
 686     if (actx == NULL || actx->init_done != MAGIC_INIT_NUM)
 687         return 1;
 688
 689     close(actx->sfd);
 690     close(actx->bfd);
 691 # ifdef ALG_ZERO_COPY
 692     close(actx->zc_pipe[0]);
 693     close(actx->zc_pipe[1]);
 694 # endif
 695     /* close efd in sync mode, async mode is closed in afalg_waitfd_cleanup() */
 696     if (actx->aio.mode == MODE_SYNC)
 697         close(actx->aio.efd);
 698     io_destroy(actx->aio.aio_ctx);
 699
 700     return 1;
 701 }
 702
 703 static cbc_handles *get_cipher_handle(int nid)
 704 {
 705     switch (nid) {
 706     case NID_aes_128_cbc:
 707         return &cbc_handle[AES_CBC_128];
 708     case NID_aes_192_cbc:
 709         return &cbc_handle[AES_CBC_192];
 710     case NID_aes_256_cbc:
 711         return &cbc_handle[AES_CBC_256];
 712     default:
 713         return NULL;
 714     }
 715 }
 716
 717 static const EVP_CIPHER *afalg_aes_cbc(int nid)
 718 {
 719     cbc_handles *cipher_handle = get_cipher_handle(nid);
 720
 721     if (cipher_handle == NULL)
 722             return NULL;
 723     if (cipher_handle->_hidden == NULL
 724         && ((cipher_handle->_hidden =
 725          EVP_CIPHER_meth_new(nid,
 726                              AES_BLOCK_SIZE,
 727                              cipher_handle->key_size)) == NULL
 728         || !EVP_CIPHER_meth_set_iv_length(cipher_handle->_hidden,
 729                                           AES_IV_LEN)
 730         || !EVP_CIPHER_meth_set_flags(cipher_handle->_hidden,
 731                                       EVP_CIPH_CBC_MODE |
 732                                       EVP_CIPH_FLAG_DEFAULT_ASN1)
 733         || !EVP_CIPHER_meth_set_init(cipher_handle->_hidden,
 734                                      afalg_cipher_init)
 735         || !EVP_CIPHER_meth_set_do_cipher(cipher_handle->_hidden,
 736                                           afalg_do_cipher)
 737         || !EVP_CIPHER_meth_set_cleanup(cipher_handle->_hidden,
 738                                         afalg_cipher_cleanup)
 739         || !EVP_CIPHER_meth_set_impl_ctx_size(cipher_handle->_hidden,
 740                                               sizeof(afalg_ctx)))) {
 741         EVP_CIPHER_meth_free(cipher_handle->_hidden);
 742         cipher_handle->_hidden= NULL;
 743     }
 744     return cipher_handle->_hidden;
 745 }
 746
 747 static int afalg_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
 748                          const int **nids, int nid)
 749 {
 750     int r = 1;
 751
 752     if (cipher == NULL) {
 753         *nids = afalg_cipher_nids;
 754         return (sizeof(afalg_cipher_nids) / sizeof(afalg_cipher_nids[0]));
 755     }
 756
 757     switch (nid) {
 758     case NID_aes_128_cbc:
 759     case NID_aes_192_cbc:
 760     case NID_aes_256_cbc:
 761         *cipher = afalg_aes_cbc(nid);
 762         break;
 763     default:
 764         *cipher = NULL;
 765         r = 0;
 766     }
 767     return r;
 768 }
 769
 770 static int bind_afalg(ENGINE *e)
 771 {
 772     /* Ensure the afalg error handling is set up */
 773     unsigned short i;
 774     ERR_load_AFALG_strings();
 775
 776     if (!ENGINE_set_id(e, engine_afalg_id)
 777         || !ENGINE_set_name(e, engine_afalg_name)
 778         || !ENGINE_set_destroy_function(e, afalg_destroy)
 779         || !ENGINE_set_init_function(e, afalg_init)
 780         || !ENGINE_set_finish_function(e, afalg_finish)) {
 781         AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED);
 782         return 0;
 783     }
 784
 785     /*
 786      * Create _hidden_aes_xxx_cbc by calling afalg_aes_xxx_cbc
 787      * now, as bind_aflag can only be called by one thread at a
 788      * time.
 789      */
 790     for (i = 0; i < OSSL_NELEM(afalg_cipher_nids); i++) {
 791         if (afalg_aes_cbc(afalg_cipher_nids[i]) == NULL) {
 792             AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED);
 793             return 0;
 794         }
 795     }
 796
 797     if (!ENGINE_set_ciphers(e, afalg_ciphers)) {
 798         AFALGerr(AFALG_F_BIND_AFALG, AFALG_R_INIT_FAILED);
 799         return 0;
 800     }
 801
 802     return 1;
 803 }
 804
 805 # ifndef OPENSSL_NO_DYNAMIC_ENGINE
 806 static int bind_helper(ENGINE *e, const char *id)
 807 {
 808     if (id && (strcmp(id, engine_afalg_id) != 0))
 809         return 0;
 810
 811     if (!afalg_chk_platform())
 812         return 0;
 813
 814     if (!bind_afalg(e))
 815         return 0;
 816     return 1;
 817 }
 818
 819 IMPLEMENT_DYNAMIC_CHECK_FN()
 820     IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
 821 # endif
 822
 823 static int afalg_chk_platform(void)
 824 {
 825     int ret;
 826     int i;
 827     int kver[3] = { -1, -1, -1 };
 828     int sock;
 829     char *str;
 830     struct utsname ut;
 831
 832     ret = uname(&ut);
 833     if (ret != 0) {
 834         AFALGerr(AFALG_F_AFALG_CHK_PLATFORM,
 835                  AFALG_R_FAILED_TO_GET_PLATFORM_INFO);
 836         return 0;
 837     }
 838
 839     str = strtok(ut.release, ".");
 840     for (i = 0; i < 3 && str != NULL; i++) {
 841         kver[i] = atoi(str);
 842         str = strtok(NULL, ".");
 843     }
 844
 845     if (KERNEL_VERSION(kver[0], kver[1], kver[2])
 846         < KERNEL_VERSION(K_MAJ, K_MIN1, K_MIN2)) {
 847         ALG_ERR("ASYNC AFALG not supported this kernel(%d.%d.%d)\n",
 848                  kver[0], kver[1], kver[2]);
 849         ALG_ERR("ASYNC AFALG requires kernel version %d.%d.%d or later\n",
 850                  K_MAJ, K_MIN1, K_MIN2);
 851         AFALGerr(AFALG_F_AFALG_CHK_PLATFORM,
 852                  AFALG_R_KERNEL_DOES_NOT_SUPPORT_ASYNC_AFALG);
 853         return 0;
 854     }
 855
 856     /* Test if we can actually create an AF_ALG socket */
 857     sock = socket(AF_ALG, SOCK_SEQPACKET, 0);
 858     if (sock == -1) {
 859         AFALGerr(AFALG_F_AFALG_CHK_PLATFORM, AFALG_R_SOCKET_CREATE_FAILED);
 860         return 0;
 861     }
 862     close(sock);
 863
 864     return 1;
 865 }
 866
 867 # ifdef OPENSSL_NO_DYNAMIC_ENGINE
 868 static ENGINE *engine_afalg(void)
 869 {
 870     ENGINE *ret = ENGINE_new();
 871     if (ret == NULL)
 872         return NULL;
 873     if (!bind_afalg(ret)) {
 874         ENGINE_free(ret);
 875         return NULL;
 876     }
 877     return ret;
 878 }
 879
 880 void engine_load_afalg_int(void)
 881 {
 882     ENGINE *toadd;
 883
 884     if (!afalg_chk_platform())
 885         return;
 886
 887     toadd = engine_afalg();
 888     if (toadd == NULL)
 889         return;
 890     ERR_set_mark();
 891     ENGINE_add(toadd);
 892     /*
 893      * If the "add" worked, it gets a structural reference. So either way, we
 894      * release our just-created reference.
 895      */
 896     ENGINE_free(toadd);
 897     /*
 898      * If the "add" didn't work, it was probably a conflict because it was
 899      * already added (eg. someone calling ENGINE_load_blah then calling
 900      * ENGINE_load_builtin_engines() perhaps).
 901      */
 902     ERR_pop_to_mark();
 903 }
 904 # endif
 905
 906 static int afalg_init(ENGINE *e)
 907 {
 908     return 1;
 909 }
 910
 911 static int afalg_finish(ENGINE *e)
 912 {
 913     return 1;
 914 }
 915
 916 static int free_cbc(void)
 917 {
 918     short unsigned int i;
 919     for (i = 0; i < OSSL_NELEM(afalg_cipher_nids); i++) {
 920         EVP_CIPHER_meth_free(cbc_handle[i]._hidden);
 921         cbc_handle[i]._hidden = NULL;
 922     }
 923     return 1;
 924 }
 925
 926 static int afalg_destroy(ENGINE *e)
 927 {
 928     ERR_unload_AFALG_strings();
 929     free_cbc();
 930     return 1;
 931 }
 932
 933 #endif                          /* KERNEL VERSION */