The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/opencrypto/cryptodev.c

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    1 /*      $OpenBSD: cryptodev.c,v 1.52 2002/06/19 07:22:46 deraadt Exp $  */
    2 
    3 /*-
    4  * Copyright (c) 2001 Theo de Raadt
    5  * Copyright (c) 2002-2006 Sam Leffler, Errno Consulting
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  *
   11  * 1. Redistributions of source code must retain the above copyright
   12  *   notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *   notice, this list of conditions and the following disclaimer in the
   15  *   documentation and/or other materials provided with the distribution.
   16  * 3. The name of the author may not be used to endorse or promote products
   17  *   derived from this software without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29  *
   30  * Effort sponsored in part by the Defense Advanced Research Projects
   31  * Agency (DARPA) and Air Force Research Laboratory, Air Force
   32  * Materiel Command, USAF, under agreement number F30602-01-2-0537.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/8.3/sys/opencrypto/cryptodev.c 214254 2010-10-23 22:11:30Z pjd $");
   37 
   38 #include "opt_compat.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/malloc.h>
   43 #include <sys/mbuf.h>
   44 #include <sys/lock.h>
   45 #include <sys/mutex.h>
   46 #include <sys/sysctl.h>
   47 #include <sys/file.h>
   48 #include <sys/filedesc.h>
   49 #include <sys/errno.h>
   50 #include <sys/uio.h>
   51 #include <sys/random.h>
   52 #include <sys/conf.h>
   53 #include <sys/kernel.h>
   54 #include <sys/module.h>
   55 #include <sys/fcntl.h>
   56 #include <sys/bus.h>
   57 
   58 #include <opencrypto/cryptodev.h>
   59 #include <opencrypto/xform.h>
   60 
   61 #ifdef COMPAT_FREEBSD32
   62 #include <sys/mount.h>
   63 #include <compat/freebsd32/freebsd32.h>
   64 
   65 struct session_op32 {
   66         u_int32_t       cipher;
   67         u_int32_t       mac;
   68         u_int32_t       keylen;
   69         u_int32_t       key;
   70         int             mackeylen;
   71         u_int32_t       mackey;
   72         u_int32_t       ses;
   73 };
   74 
   75 struct session2_op32 {
   76         u_int32_t       cipher;
   77         u_int32_t       mac;
   78         u_int32_t       keylen;
   79         u_int32_t       key;
   80         int             mackeylen;
   81         u_int32_t       mackey;
   82         u_int32_t       ses;
   83         int             crid;
   84         int             pad[4];
   85 };
   86 
   87 struct crypt_op32 {
   88         u_int32_t       ses;
   89         u_int16_t       op;
   90         u_int16_t       flags;
   91         u_int           len;
   92         u_int32_t       src, dst;
   93         u_int32_t       mac;
   94         u_int32_t       iv;
   95 };
   96 
   97 struct crparam32 {
   98         u_int32_t       crp_p;
   99         u_int           crp_nbits;
  100 };
  101 
  102 struct crypt_kop32 {
  103         u_int           crk_op;
  104         u_int           crk_status;
  105         u_short         crk_iparams;
  106         u_short         crk_oparams;
  107         u_int           crk_crid;
  108         struct crparam32        crk_param[CRK_MAXPARAM];
  109 };
  110 
  111 struct cryptotstat32 {
  112         struct timespec32       acc;
  113         struct timespec32       min;
  114         struct timespec32       max;
  115         u_int32_t       count;
  116 };
  117 
  118 struct cryptostats32 {
  119         u_int32_t       cs_ops;
  120         u_int32_t       cs_errs;
  121         u_int32_t       cs_kops;
  122         u_int32_t       cs_kerrs;
  123         u_int32_t       cs_intrs;
  124         u_int32_t       cs_rets;
  125         u_int32_t       cs_blocks;
  126         u_int32_t       cs_kblocks;
  127         struct cryptotstat32 cs_invoke;
  128         struct cryptotstat32 cs_done;
  129         struct cryptotstat32 cs_cb;
  130         struct cryptotstat32 cs_finis;
  131 };
  132 
  133 #define CIOCGSESSION32  _IOWR('c', 101, struct session_op32)
  134 #define CIOCCRYPT32     _IOWR('c', 103, struct crypt_op32)
  135 #define CIOCKEY32       _IOWR('c', 104, struct crypt_kop32)
  136 #define CIOCGSESSION232 _IOWR('c', 106, struct session2_op32)
  137 #define CIOCKEY232      _IOWR('c', 107, struct crypt_kop32)
  138 
  139 static void
  140 session_op_from_32(const struct session_op32 *from, struct session_op *to)
  141 {
  142 
  143         CP(*from, *to, cipher);
  144         CP(*from, *to, mac);
  145         CP(*from, *to, keylen);
  146         PTRIN_CP(*from, *to, key);
  147         CP(*from, *to, mackeylen);
  148         PTRIN_CP(*from, *to, mackey);
  149         CP(*from, *to, ses);
  150 }
  151 
  152 static void
  153 session2_op_from_32(const struct session2_op32 *from, struct session2_op *to)
  154 {
  155 
  156         session_op_from_32((const struct session_op32 *)from,
  157             (struct session_op *)to);
  158         CP(*from, *to, crid);
  159 }
  160 
  161 static void
  162 session_op_to_32(const struct session_op *from, struct session_op32 *to)
  163 {
  164 
  165         CP(*from, *to, cipher);
  166         CP(*from, *to, mac);
  167         CP(*from, *to, keylen);
  168         PTROUT_CP(*from, *to, key);
  169         CP(*from, *to, mackeylen);
  170         PTROUT_CP(*from, *to, mackey);
  171         CP(*from, *to, ses);
  172 }
  173 
  174 static void
  175 session2_op_to_32(const struct session2_op *from, struct session2_op32 *to)
  176 {
  177 
  178         session_op_to_32((const struct session_op *)from,
  179             (struct session_op32 *)to);
  180         CP(*from, *to, crid);
  181 }
  182 
  183 static void
  184 crypt_op_from_32(const struct crypt_op32 *from, struct crypt_op *to)
  185 {
  186 
  187         CP(*from, *to, ses);
  188         CP(*from, *to, op);
  189         CP(*from, *to, flags);
  190         CP(*from, *to, len);
  191         PTRIN_CP(*from, *to, src);
  192         PTRIN_CP(*from, *to, dst);
  193         PTRIN_CP(*from, *to, mac);
  194         PTRIN_CP(*from, *to, iv);
  195 }
  196 
  197 static void
  198 crypt_op_to_32(const struct crypt_op *from, struct crypt_op32 *to)
  199 {
  200 
  201         CP(*from, *to, ses);
  202         CP(*from, *to, op);
  203         CP(*from, *to, flags);
  204         CP(*from, *to, len);
  205         PTROUT_CP(*from, *to, src);
  206         PTROUT_CP(*from, *to, dst);
  207         PTROUT_CP(*from, *to, mac);
  208         PTROUT_CP(*from, *to, iv);
  209 }
  210 
  211 static void
  212 crparam_from_32(const struct crparam32 *from, struct crparam *to)
  213 {
  214 
  215         PTRIN_CP(*from, *to, crp_p);
  216         CP(*from, *to, crp_nbits);
  217 }
  218 
  219 static void
  220 crparam_to_32(const struct crparam *from, struct crparam32 *to)
  221 {
  222 
  223         PTROUT_CP(*from, *to, crp_p);
  224         CP(*from, *to, crp_nbits);
  225 }
  226 
  227 static void
  228 crypt_kop_from_32(const struct crypt_kop32 *from, struct crypt_kop *to)
  229 {
  230         int i;
  231 
  232         CP(*from, *to, crk_op);
  233         CP(*from, *to, crk_status);
  234         CP(*from, *to, crk_iparams);
  235         CP(*from, *to, crk_oparams);
  236         CP(*from, *to, crk_crid);
  237         for (i = 0; i < CRK_MAXPARAM; i++)
  238                 crparam_from_32(&from->crk_param[i], &to->crk_param[i]);
  239 }
  240 
  241 static void
  242 crypt_kop_to_32(const struct crypt_kop *from, struct crypt_kop32 *to)
  243 {
  244         int i;
  245 
  246         CP(*from, *to, crk_op);
  247         CP(*from, *to, crk_status);
  248         CP(*from, *to, crk_iparams);
  249         CP(*from, *to, crk_oparams);
  250         CP(*from, *to, crk_crid);
  251         for (i = 0; i < CRK_MAXPARAM; i++)
  252                 crparam_to_32(&from->crk_param[i], &to->crk_param[i]);
  253 }
  254 #endif
  255 
  256 struct csession {
  257         TAILQ_ENTRY(csession) next;
  258         u_int64_t       sid;
  259         u_int32_t       ses;
  260         struct mtx      lock;           /* for op submission */
  261 
  262         u_int32_t       cipher;
  263         struct enc_xform *txform;
  264         u_int32_t       mac;
  265         struct auth_hash *thash;
  266 
  267         caddr_t         key;
  268         int             keylen;
  269         u_char          tmp_iv[EALG_MAX_BLOCK_LEN];
  270 
  271         caddr_t         mackey;
  272         int             mackeylen;
  273 
  274         struct iovec    iovec;
  275         struct uio      uio;
  276         int             error;
  277 };
  278 
  279 struct fcrypt {
  280         TAILQ_HEAD(csessionlist, csession) csessions;
  281         int             sesn;
  282 };
  283 
  284 static  int cryptof_rw(struct file *fp, struct uio *uio,
  285                     struct ucred *cred, int flags, struct thread *);
  286 static  int cryptof_truncate(struct file *, off_t, struct ucred *,
  287                     struct thread *);
  288 static  int cryptof_ioctl(struct file *, u_long, void *,
  289                     struct ucred *, struct thread *);
  290 static  int cryptof_poll(struct file *, int, struct ucred *, struct thread *);
  291 static  int cryptof_kqfilter(struct file *, struct knote *);
  292 static  int cryptof_stat(struct file *, struct stat *,
  293                     struct ucred *, struct thread *);
  294 static  int cryptof_close(struct file *, struct thread *);
  295 
  296 static struct fileops cryptofops = {
  297     .fo_read = cryptof_rw,
  298     .fo_write = cryptof_rw,
  299     .fo_truncate = cryptof_truncate,
  300     .fo_ioctl = cryptof_ioctl,
  301     .fo_poll = cryptof_poll,
  302     .fo_kqfilter = cryptof_kqfilter,
  303     .fo_stat = cryptof_stat,
  304     .fo_close = cryptof_close
  305 };
  306 
  307 static struct csession *csefind(struct fcrypt *, u_int);
  308 static int csedelete(struct fcrypt *, struct csession *);
  309 static struct csession *cseadd(struct fcrypt *, struct csession *);
  310 static struct csession *csecreate(struct fcrypt *, u_int64_t, caddr_t,
  311     u_int64_t, caddr_t, u_int64_t, u_int32_t, u_int32_t, struct enc_xform *,
  312     struct auth_hash *);
  313 static int csefree(struct csession *);
  314 
  315 static  int cryptodev_op(struct csession *, struct crypt_op *,
  316                         struct ucred *, struct thread *td);
  317 static  int cryptodev_key(struct crypt_kop *);
  318 static  int cryptodev_find(struct crypt_find_op *);
  319 
  320 static int
  321 cryptof_rw(
  322         struct file *fp,
  323         struct uio *uio,
  324         struct ucred *active_cred,
  325         int flags,
  326         struct thread *td)
  327 {
  328 
  329         return (EIO);
  330 }
  331 
  332 static int
  333 cryptof_truncate(
  334         struct file *fp,
  335         off_t length,
  336         struct ucred *active_cred,
  337         struct thread *td)
  338 {
  339 
  340         return (EINVAL);
  341 }
  342 
  343 /*
  344  * Check a crypto identifier to see if it requested
  345  * a software device/driver.  This can be done either
  346  * by device name/class or through search constraints.
  347  */
  348 static int
  349 checkforsoftware(int crid)
  350 {
  351         if (crid & CRYPTOCAP_F_SOFTWARE)
  352                 return EINVAL;          /* XXX */
  353         if ((crid & CRYPTOCAP_F_HARDWARE) == 0 &&
  354             (crypto_getcaps(crid) & CRYPTOCAP_F_HARDWARE) == 0)
  355                 return EINVAL;          /* XXX */
  356         return 0;
  357 }
  358 
  359 /* ARGSUSED */
  360 static int
  361 cryptof_ioctl(
  362         struct file *fp,
  363         u_long cmd,
  364         void *data,
  365         struct ucred *active_cred,
  366         struct thread *td)
  367 {
  368 #define SES2(p) ((struct session2_op *)p)
  369         struct cryptoini cria, crie;
  370         struct fcrypt *fcr = fp->f_data;
  371         struct csession *cse;
  372         struct session_op *sop;
  373         struct crypt_op *cop;
  374         struct enc_xform *txform = NULL;
  375         struct auth_hash *thash = NULL;
  376         struct crypt_kop *kop;
  377         u_int64_t sid;
  378         u_int32_t ses;
  379         int error = 0, crid;
  380 #ifdef COMPAT_FREEBSD32
  381         struct session2_op sopc;
  382         struct crypt_op copc;
  383         struct crypt_kop kopc;
  384 #endif
  385 
  386         switch (cmd) {
  387         case CIOCGSESSION:
  388         case CIOCGSESSION2:
  389 #ifdef COMPAT_FREEBSD32
  390         case CIOCGSESSION32:
  391         case CIOCGSESSION232:
  392                 if (cmd == CIOCGSESSION32) {
  393                         session_op_from_32(data, (struct session_op *)&sopc);
  394                         sop = (struct session_op *)&sopc;
  395                 } else if (cmd == CIOCGSESSION232) {
  396                         session2_op_from_32(data, &sopc);
  397                         sop = (struct session_op *)&sopc;
  398                 } else
  399 #endif
  400                         sop = (struct session_op *)data;
  401                 switch (sop->cipher) {
  402                 case 0:
  403                         break;
  404                 case CRYPTO_DES_CBC:
  405                         txform = &enc_xform_des;
  406                         break;
  407                 case CRYPTO_3DES_CBC:
  408                         txform = &enc_xform_3des;
  409                         break;
  410                 case CRYPTO_BLF_CBC:
  411                         txform = &enc_xform_blf;
  412                         break;
  413                 case CRYPTO_CAST_CBC:
  414                         txform = &enc_xform_cast5;
  415                         break;
  416                 case CRYPTO_SKIPJACK_CBC:
  417                         txform = &enc_xform_skipjack;
  418                         break;
  419                 case CRYPTO_AES_CBC:
  420                         txform = &enc_xform_rijndael128;
  421                         break;
  422                 case CRYPTO_AES_XTS:
  423                         txform = &enc_xform_aes_xts;
  424                         break;
  425                 case CRYPTO_NULL_CBC:
  426                         txform = &enc_xform_null;
  427                         break;
  428                 case CRYPTO_ARC4:
  429                         txform = &enc_xform_arc4;
  430                         break;
  431                 case CRYPTO_CAMELLIA_CBC:
  432                         txform = &enc_xform_camellia;
  433                         break;
  434                 default:
  435                         return (EINVAL);
  436                 }
  437 
  438                 switch (sop->mac) {
  439                 case 0:
  440                         break;
  441                 case CRYPTO_MD5_HMAC:
  442                         thash = &auth_hash_hmac_md5;
  443                         break;
  444                 case CRYPTO_SHA1_HMAC:
  445                         thash = &auth_hash_hmac_sha1;
  446                         break;
  447                 case CRYPTO_SHA2_256_HMAC:
  448                         thash = &auth_hash_hmac_sha2_256;
  449                         break;
  450                 case CRYPTO_SHA2_384_HMAC:
  451                         thash = &auth_hash_hmac_sha2_384;
  452                         break;
  453                 case CRYPTO_SHA2_512_HMAC:
  454                         thash = &auth_hash_hmac_sha2_512;
  455                         break;
  456                 case CRYPTO_RIPEMD160_HMAC:
  457                         thash = &auth_hash_hmac_ripemd_160;
  458                         break;
  459 #ifdef notdef
  460                 case CRYPTO_MD5:
  461                         thash = &auth_hash_md5;
  462                         break;
  463                 case CRYPTO_SHA1:
  464                         thash = &auth_hash_sha1;
  465                         break;
  466 #endif
  467                 case CRYPTO_NULL_HMAC:
  468                         thash = &auth_hash_null;
  469                         break;
  470                 default:
  471                         return (EINVAL);
  472                 }
  473 
  474                 bzero(&crie, sizeof(crie));
  475                 bzero(&cria, sizeof(cria));
  476 
  477                 if (txform) {
  478                         crie.cri_alg = txform->type;
  479                         crie.cri_klen = sop->keylen * 8;
  480                         if (sop->keylen > txform->maxkey ||
  481                             sop->keylen < txform->minkey) {
  482                                 error = EINVAL;
  483                                 goto bail;
  484                         }
  485 
  486                         crie.cri_key = malloc(crie.cri_klen / 8,
  487                             M_XDATA, M_WAITOK);
  488                         if ((error = copyin(sop->key, crie.cri_key,
  489                             crie.cri_klen / 8)))
  490                                 goto bail;
  491                         if (thash)
  492                                 crie.cri_next = &cria;
  493                 }
  494 
  495                 if (thash) {
  496                         cria.cri_alg = thash->type;
  497                         cria.cri_klen = sop->mackeylen * 8;
  498                         if (sop->mackeylen != thash->keysize) {
  499                                 error = EINVAL;
  500                                 goto bail;
  501                         }
  502 
  503                         if (cria.cri_klen) {
  504                                 cria.cri_key = malloc(cria.cri_klen / 8,
  505                                     M_XDATA, M_WAITOK);
  506                                 if ((error = copyin(sop->mackey, cria.cri_key,
  507                                     cria.cri_klen / 8)))
  508                                         goto bail;
  509                         }
  510                 }
  511 
  512                 /* NB: CIOGSESSION2 has the crid */
  513                 if (cmd == CIOCGSESSION2
  514 #ifdef COMPAT_FREEBSD32
  515                     || cmd == CIOCGSESSION232
  516 #endif
  517                         ) {
  518                         crid = SES2(sop)->crid;
  519                         error = checkforsoftware(crid);
  520                         if (error)
  521                                 goto bail;
  522                 } else
  523                         crid = CRYPTOCAP_F_HARDWARE;
  524                 error = crypto_newsession(&sid, (txform ? &crie : &cria), crid);
  525                 if (error)
  526                         goto bail;
  527 
  528                 cse = csecreate(fcr, sid, crie.cri_key, crie.cri_klen,
  529                     cria.cri_key, cria.cri_klen, sop->cipher, sop->mac, txform,
  530                     thash);
  531 
  532                 if (cse == NULL) {
  533                         crypto_freesession(sid);
  534                         error = EINVAL;
  535                         goto bail;
  536                 }
  537                 sop->ses = cse->ses;
  538                 if (cmd == CIOCGSESSION2
  539 #ifdef COMPAT_FREEBSD32
  540                     || cmd == CIOCGSESSION232
  541 #endif
  542                     ) {
  543                         /* return hardware/driver id */
  544                         SES2(sop)->crid = CRYPTO_SESID2HID(cse->sid);
  545                 }
  546 bail:
  547                 if (error) {
  548                         if (crie.cri_key)
  549                                 free(crie.cri_key, M_XDATA);
  550                         if (cria.cri_key)
  551                                 free(cria.cri_key, M_XDATA);
  552                 }
  553 #ifdef COMPAT_FREEBSD32
  554                 else {
  555                         if (cmd == CIOCGSESSION32)
  556                                 session_op_to_32(sop, data);
  557                         else if (cmd == CIOCGSESSION232)
  558                                 session2_op_to_32((struct session2_op *)sop,
  559                                     data);
  560                 }
  561 #endif
  562                 break;
  563         case CIOCFSESSION:
  564                 ses = *(u_int32_t *)data;
  565                 cse = csefind(fcr, ses);
  566                 if (cse == NULL)
  567                         return (EINVAL);
  568                 csedelete(fcr, cse);
  569                 error = csefree(cse);
  570                 break;
  571         case CIOCCRYPT:
  572 #ifdef COMPAT_FREEBSD32
  573         case CIOCCRYPT32:
  574                 if (cmd == CIOCCRYPT32) {
  575                         cop = &copc;
  576                         crypt_op_from_32(data, cop);
  577                 } else
  578 #endif
  579                         cop = (struct crypt_op *)data;
  580                 cse = csefind(fcr, cop->ses);
  581                 if (cse == NULL)
  582                         return (EINVAL);
  583                 error = cryptodev_op(cse, cop, active_cred, td);
  584 #ifdef COMPAT_FREEBSD32
  585                 if (error == 0 && cmd == CIOCCRYPT32)
  586                         crypt_op_to_32(cop, data);
  587 #endif
  588                 break;
  589         case CIOCKEY:
  590         case CIOCKEY2:
  591 #ifdef COMPAT_FREEBSD32
  592         case CIOCKEY32:
  593         case CIOCKEY232:
  594 #endif
  595                 if (!crypto_userasymcrypto)
  596                         return (EPERM);         /* XXX compat? */
  597 #ifdef COMPAT_FREEBSD32
  598                 if (cmd == CIOCKEY32 || cmd == CIOCKEY232) {
  599                         kop = &kopc;
  600                         crypt_kop_from_32(data, kop);
  601                 } else
  602 #endif
  603                         kop = (struct crypt_kop *)data;
  604                 if (cmd == CIOCKEY
  605 #ifdef COMPAT_FREEBSD32
  606                     || cmd == CIOCKEY32
  607 #endif
  608                     ) {
  609                         /* NB: crypto core enforces s/w driver use */
  610                         kop->crk_crid =
  611                             CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE;
  612                 }
  613                 mtx_lock(&Giant);
  614                 error = cryptodev_key(kop);
  615                 mtx_unlock(&Giant);
  616 #ifdef COMPAT_FREEBSD32
  617                 if (cmd == CIOCKEY32 || cmd == CIOCKEY232)
  618                         crypt_kop_to_32(kop, data);
  619 #endif
  620                 break;
  621         case CIOCASYMFEAT:
  622                 if (!crypto_userasymcrypto) {
  623                         /*
  624                          * NB: if user asym crypto operations are
  625                          * not permitted return "no algorithms"
  626                          * so well-behaved applications will just
  627                          * fallback to doing them in software.
  628                          */
  629                         *(int *)data = 0;
  630                 } else
  631                         error = crypto_getfeat((int *)data);
  632                 break;
  633         case CIOCFINDDEV:
  634                 error = cryptodev_find((struct crypt_find_op *)data);
  635                 break;
  636         default:
  637                 error = EINVAL;
  638                 break;
  639         }
  640         return (error);
  641 #undef SES2
  642 }
  643 
  644 static int cryptodev_cb(void *);
  645 
  646 
  647 static int
  648 cryptodev_op(
  649         struct csession *cse,
  650         struct crypt_op *cop,
  651         struct ucred *active_cred,
  652         struct thread *td)
  653 {
  654         struct cryptop *crp = NULL;
  655         struct cryptodesc *crde = NULL, *crda = NULL;
  656         int error;
  657 
  658         if (cop->len > 256*1024-4)
  659                 return (E2BIG);
  660 
  661         if (cse->txform) {
  662                 if (cop->len == 0 || (cop->len % cse->txform->blocksize) != 0)
  663                         return (EINVAL);
  664         }
  665 
  666         cse->uio.uio_iov = &cse->iovec;
  667         cse->uio.uio_iovcnt = 1;
  668         cse->uio.uio_offset = 0;
  669         cse->uio.uio_resid = cop->len;
  670         cse->uio.uio_segflg = UIO_SYSSPACE;
  671         cse->uio.uio_rw = UIO_WRITE;
  672         cse->uio.uio_td = td;
  673         cse->uio.uio_iov[0].iov_len = cop->len;
  674         if (cse->thash) {
  675                 cse->uio.uio_iov[0].iov_len += cse->thash->hashsize;
  676                 cse->uio.uio_resid += cse->thash->hashsize;
  677         }
  678         cse->uio.uio_iov[0].iov_base = malloc(cse->uio.uio_iov[0].iov_len,
  679             M_XDATA, M_WAITOK);
  680 
  681         crp = crypto_getreq((cse->txform != NULL) + (cse->thash != NULL));
  682         if (crp == NULL) {
  683                 error = ENOMEM;
  684                 goto bail;
  685         }
  686 
  687         if (cse->thash) {
  688                 crda = crp->crp_desc;
  689                 if (cse->txform)
  690                         crde = crda->crd_next;
  691         } else {
  692                 if (cse->txform)
  693                         crde = crp->crp_desc;
  694                 else {
  695                         error = EINVAL;
  696                         goto bail;
  697                 }
  698         }
  699 
  700         if ((error = copyin(cop->src, cse->uio.uio_iov[0].iov_base, cop->len)))
  701                 goto bail;
  702 
  703         if (crda) {
  704                 crda->crd_skip = 0;
  705                 crda->crd_len = cop->len;
  706                 crda->crd_inject = cop->len;
  707 
  708                 crda->crd_alg = cse->mac;
  709                 crda->crd_key = cse->mackey;
  710                 crda->crd_klen = cse->mackeylen * 8;
  711         }
  712 
  713         if (crde) {
  714                 if (cop->op == COP_ENCRYPT)
  715                         crde->crd_flags |= CRD_F_ENCRYPT;
  716                 else
  717                         crde->crd_flags &= ~CRD_F_ENCRYPT;
  718                 crde->crd_len = cop->len;
  719                 crde->crd_inject = 0;
  720 
  721                 crde->crd_alg = cse->cipher;
  722                 crde->crd_key = cse->key;
  723                 crde->crd_klen = cse->keylen * 8;
  724         }
  725 
  726         crp->crp_ilen = cop->len;
  727         crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIMM
  728                        | (cop->flags & COP_F_BATCH);
  729         crp->crp_buf = (caddr_t)&cse->uio;
  730         crp->crp_callback = (int (*) (struct cryptop *)) cryptodev_cb;
  731         crp->crp_sid = cse->sid;
  732         crp->crp_opaque = (void *)cse;
  733 
  734         if (cop->iv) {
  735                 if (crde == NULL) {
  736                         error = EINVAL;
  737                         goto bail;
  738                 }
  739                 if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */
  740                         error = EINVAL;
  741                         goto bail;
  742                 }
  743                 if ((error = copyin(cop->iv, cse->tmp_iv, cse->txform->blocksize)))
  744                         goto bail;
  745                 bcopy(cse->tmp_iv, crde->crd_iv, cse->txform->blocksize);
  746                 crde->crd_flags |= CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
  747                 crde->crd_skip = 0;
  748         } else if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */
  749                 crde->crd_skip = 0;
  750         } else if (crde) {
  751                 crde->crd_flags |= CRD_F_IV_PRESENT;
  752                 crde->crd_skip = cse->txform->blocksize;
  753                 crde->crd_len -= cse->txform->blocksize;
  754         }
  755 
  756         if (cop->mac && crda == NULL) {
  757                 error = EINVAL;
  758                 goto bail;
  759         }
  760 
  761         /*
  762          * Let the dispatch run unlocked, then, interlock against the
  763          * callback before checking if the operation completed and going
  764          * to sleep.  This insures drivers don't inherit our lock which
  765          * results in a lock order reversal between crypto_dispatch forced
  766          * entry and the crypto_done callback into us.
  767          */
  768         error = crypto_dispatch(crp);
  769         mtx_lock(&cse->lock);
  770         if (error == 0 && (crp->crp_flags & CRYPTO_F_DONE) == 0)
  771                 error = msleep(crp, &cse->lock, PWAIT, "crydev", 0);
  772         mtx_unlock(&cse->lock);
  773 
  774         if (error != 0)
  775                 goto bail;
  776 
  777         if (crp->crp_etype != 0) {
  778                 error = crp->crp_etype;
  779                 goto bail;
  780         }
  781 
  782         if (cse->error) {
  783                 error = cse->error;
  784                 goto bail;
  785         }
  786 
  787         if (cop->dst &&
  788             (error = copyout(cse->uio.uio_iov[0].iov_base, cop->dst, cop->len)))
  789                 goto bail;
  790 
  791         if (cop->mac &&
  792             (error = copyout((caddr_t)cse->uio.uio_iov[0].iov_base + cop->len,
  793             cop->mac, cse->thash->hashsize)))
  794                 goto bail;
  795 
  796 bail:
  797         if (crp)
  798                 crypto_freereq(crp);
  799         if (cse->uio.uio_iov[0].iov_base)
  800                 free(cse->uio.uio_iov[0].iov_base, M_XDATA);
  801 
  802         return (error);
  803 }
  804 
  805 static int
  806 cryptodev_cb(void *op)
  807 {
  808         struct cryptop *crp = (struct cryptop *) op;
  809         struct csession *cse = (struct csession *)crp->crp_opaque;
  810         int error;
  811 
  812         error = crp->crp_etype;
  813         if (error == EAGAIN)
  814                 error = crypto_dispatch(crp);
  815         mtx_lock(&cse->lock);
  816         if (error != 0 || (crp->crp_flags & CRYPTO_F_DONE)) {
  817                 cse->error = error;
  818                 wakeup_one(crp);
  819         }
  820         mtx_unlock(&cse->lock);
  821         return (0);
  822 }
  823 
  824 static int
  825 cryptodevkey_cb(void *op)
  826 {
  827         struct cryptkop *krp = (struct cryptkop *) op;
  828 
  829         wakeup_one(krp);
  830         return (0);
  831 }
  832 
  833 static int
  834 cryptodev_key(struct crypt_kop *kop)
  835 {
  836         struct cryptkop *krp = NULL;
  837         int error = EINVAL;
  838         int in, out, size, i;
  839 
  840         if (kop->crk_iparams + kop->crk_oparams > CRK_MAXPARAM) {
  841                 return (EFBIG);
  842         }
  843 
  844         in = kop->crk_iparams;
  845         out = kop->crk_oparams;
  846         switch (kop->crk_op) {
  847         case CRK_MOD_EXP:
  848                 if (in == 3 && out == 1)
  849                         break;
  850                 return (EINVAL);
  851         case CRK_MOD_EXP_CRT:
  852                 if (in == 6 && out == 1)
  853                         break;
  854                 return (EINVAL);
  855         case CRK_DSA_SIGN:
  856                 if (in == 5 && out == 2)
  857                         break;
  858                 return (EINVAL);
  859         case CRK_DSA_VERIFY:
  860                 if (in == 7 && out == 0)
  861                         break;
  862                 return (EINVAL);
  863         case CRK_DH_COMPUTE_KEY:
  864                 if (in == 3 && out == 1)
  865                         break;
  866                 return (EINVAL);
  867         default:
  868                 return (EINVAL);
  869         }
  870 
  871         krp = (struct cryptkop *)malloc(sizeof *krp, M_XDATA, M_WAITOK|M_ZERO);
  872         if (!krp)
  873                 return (ENOMEM);
  874         krp->krp_op = kop->crk_op;
  875         krp->krp_status = kop->crk_status;
  876         krp->krp_iparams = kop->crk_iparams;
  877         krp->krp_oparams = kop->crk_oparams;
  878         krp->krp_crid = kop->crk_crid;
  879         krp->krp_status = 0;
  880         krp->krp_callback = (int (*) (struct cryptkop *)) cryptodevkey_cb;
  881 
  882         for (i = 0; i < CRK_MAXPARAM; i++) {
  883                 if (kop->crk_param[i].crp_nbits > 65536)
  884                         /* Limit is the same as in OpenBSD */
  885                         goto fail;
  886                 krp->krp_param[i].crp_nbits = kop->crk_param[i].crp_nbits;
  887         }
  888         for (i = 0; i < krp->krp_iparams + krp->krp_oparams; i++) {
  889                 size = (krp->krp_param[i].crp_nbits + 7) / 8;
  890                 if (size == 0)
  891                         continue;
  892                 krp->krp_param[i].crp_p = malloc(size, M_XDATA, M_WAITOK);
  893                 if (i >= krp->krp_iparams)
  894                         continue;
  895                 error = copyin(kop->crk_param[i].crp_p, krp->krp_param[i].crp_p, size);
  896                 if (error)
  897                         goto fail;
  898         }
  899 
  900         error = crypto_kdispatch(krp);
  901         if (error)
  902                 goto fail;
  903         error = tsleep(krp, PSOCK, "crydev", 0);
  904         if (error) {
  905                 /* XXX can this happen?  if so, how do we recover? */
  906                 goto fail;
  907         }
  908         
  909         kop->crk_crid = krp->krp_crid;          /* device that did the work */
  910         if (krp->krp_status != 0) {
  911                 error = krp->krp_status;
  912                 goto fail;
  913         }
  914 
  915         for (i = krp->krp_iparams; i < krp->krp_iparams + krp->krp_oparams; i++) {
  916                 size = (krp->krp_param[i].crp_nbits + 7) / 8;
  917                 if (size == 0)
  918                         continue;
  919                 error = copyout(krp->krp_param[i].crp_p, kop->crk_param[i].crp_p, size);
  920                 if (error)
  921                         goto fail;
  922         }
  923 
  924 fail:
  925         if (krp) {
  926                 kop->crk_status = krp->krp_status;
  927                 for (i = 0; i < CRK_MAXPARAM; i++) {
  928                         if (krp->krp_param[i].crp_p)
  929                                 free(krp->krp_param[i].crp_p, M_XDATA);
  930                 }
  931                 free(krp, M_XDATA);
  932         }
  933         return (error);
  934 }
  935 
  936 static int
  937 cryptodev_find(struct crypt_find_op *find)
  938 {
  939         device_t dev;
  940 
  941         if (find->crid != -1) {
  942                 dev = crypto_find_device_byhid(find->crid);
  943                 if (dev == NULL)
  944                         return (ENOENT);
  945                 strlcpy(find->name, device_get_nameunit(dev),
  946                     sizeof(find->name));
  947         } else {
  948                 find->crid = crypto_find_driver(find->name);
  949                 if (find->crid == -1)
  950                         return (ENOENT);
  951         }
  952         return (0);
  953 }
  954 
  955 /* ARGSUSED */
  956 static int
  957 cryptof_poll(
  958         struct file *fp,
  959         int events,
  960         struct ucred *active_cred,
  961         struct thread *td)
  962 {
  963 
  964         return (0);
  965 }
  966 
  967 /* ARGSUSED */
  968 static int
  969 cryptof_kqfilter(struct file *fp, struct knote *kn)
  970 {
  971 
  972         return (0);
  973 }
  974 
  975 /* ARGSUSED */
  976 static int
  977 cryptof_stat(
  978         struct file *fp,
  979         struct stat *sb,
  980         struct ucred *active_cred,
  981         struct thread *td)
  982 {
  983 
  984         return (EOPNOTSUPP);
  985 }
  986 
  987 /* ARGSUSED */
  988 static int
  989 cryptof_close(struct file *fp, struct thread *td)
  990 {
  991         struct fcrypt *fcr = fp->f_data;
  992         struct csession *cse;
  993 
  994         while ((cse = TAILQ_FIRST(&fcr->csessions))) {
  995                 TAILQ_REMOVE(&fcr->csessions, cse, next);
  996                 (void)csefree(cse);
  997         }
  998         free(fcr, M_XDATA);
  999         fp->f_data = NULL;
 1000         return 0;
 1001 }
 1002 
 1003 static struct csession *
 1004 csefind(struct fcrypt *fcr, u_int ses)
 1005 {
 1006         struct csession *cse;
 1007 
 1008         TAILQ_FOREACH(cse, &fcr->csessions, next)
 1009                 if (cse->ses == ses)
 1010                         return (cse);
 1011         return (NULL);
 1012 }
 1013 
 1014 static int
 1015 csedelete(struct fcrypt *fcr, struct csession *cse_del)
 1016 {
 1017         struct csession *cse;
 1018 
 1019         TAILQ_FOREACH(cse, &fcr->csessions, next) {
 1020                 if (cse == cse_del) {
 1021                         TAILQ_REMOVE(&fcr->csessions, cse, next);
 1022                         return (1);
 1023                 }
 1024         }
 1025         return (0);
 1026 }
 1027         
 1028 static struct csession *
 1029 cseadd(struct fcrypt *fcr, struct csession *cse)
 1030 {
 1031         TAILQ_INSERT_TAIL(&fcr->csessions, cse, next);
 1032         cse->ses = fcr->sesn++;
 1033         return (cse);
 1034 }
 1035 
 1036 struct csession *
 1037 csecreate(struct fcrypt *fcr, u_int64_t sid, caddr_t key, u_int64_t keylen,
 1038     caddr_t mackey, u_int64_t mackeylen, u_int32_t cipher, u_int32_t mac,
 1039     struct enc_xform *txform, struct auth_hash *thash)
 1040 {
 1041         struct csession *cse;
 1042 
 1043 #ifdef INVARIANTS
 1044         /* NB: required when mtx_init is built with INVARIANTS */
 1045         cse = malloc(sizeof(struct csession), M_XDATA, M_NOWAIT | M_ZERO);
 1046 #else
 1047         cse = malloc(sizeof(struct csession), M_XDATA, M_NOWAIT);
 1048 #endif
 1049         if (cse == NULL)
 1050                 return NULL;
 1051         mtx_init(&cse->lock, "cryptodev", "crypto session lock", MTX_DEF);
 1052         cse->key = key;
 1053         cse->keylen = keylen/8;
 1054         cse->mackey = mackey;
 1055         cse->mackeylen = mackeylen/8;
 1056         cse->sid = sid;
 1057         cse->cipher = cipher;
 1058         cse->mac = mac;
 1059         cse->txform = txform;
 1060         cse->thash = thash;
 1061         cseadd(fcr, cse);
 1062         return (cse);
 1063 }
 1064 
 1065 static int
 1066 csefree(struct csession *cse)
 1067 {
 1068         int error;
 1069 
 1070         error = crypto_freesession(cse->sid);
 1071         mtx_destroy(&cse->lock);
 1072         if (cse->key)
 1073                 free(cse->key, M_XDATA);
 1074         if (cse->mackey)
 1075                 free(cse->mackey, M_XDATA);
 1076         free(cse, M_XDATA);
 1077         return (error);
 1078 }
 1079 
 1080 static int
 1081 cryptoopen(struct cdev *dev, int oflags, int devtype, struct thread *td)
 1082 {
 1083         return (0);
 1084 }
 1085 
 1086 static int
 1087 cryptoread(struct cdev *dev, struct uio *uio, int ioflag)
 1088 {
 1089         return (EIO);
 1090 }
 1091 
 1092 static int
 1093 cryptowrite(struct cdev *dev, struct uio *uio, int ioflag)
 1094 {
 1095         return (EIO);
 1096 }
 1097 
 1098 static int
 1099 cryptoioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
 1100 {
 1101         struct file *f;
 1102         struct fcrypt *fcr;
 1103         int fd, error;
 1104 
 1105         switch (cmd) {
 1106         case CRIOGET:
 1107                 fcr = malloc(sizeof(struct fcrypt), M_XDATA, M_WAITOK);
 1108                 TAILQ_INIT(&fcr->csessions);
 1109                 fcr->sesn = 0;
 1110 
 1111                 error = falloc(td, &f, &fd);
 1112 
 1113                 if (error) {
 1114                         free(fcr, M_XDATA);
 1115                         return (error);
 1116                 }
 1117                 /* falloc automatically provides an extra reference to 'f'. */
 1118                 finit(f, FREAD | FWRITE, DTYPE_CRYPTO, fcr, &cryptofops);
 1119                 *(u_int32_t *)data = fd;
 1120                 fdrop(f, td);
 1121                 break;
 1122         case CRIOFINDDEV:
 1123                 error = cryptodev_find((struct crypt_find_op *)data);
 1124                 break;
 1125         case CRIOASYMFEAT:
 1126                 error = crypto_getfeat((int *)data);
 1127                 break;
 1128         default:
 1129                 error = EINVAL;
 1130                 break;
 1131         }
 1132         return (error);
 1133 }
 1134 
 1135 static struct cdevsw crypto_cdevsw = {
 1136         .d_version =    D_VERSION,
 1137         .d_flags =      D_NEEDGIANT,
 1138         .d_open =       cryptoopen,
 1139         .d_read =       cryptoread,
 1140         .d_write =      cryptowrite,
 1141         .d_ioctl =      cryptoioctl,
 1142         .d_name =       "crypto",
 1143 };
 1144 static struct cdev *crypto_dev;
 1145 
 1146 /*
 1147  * Initialization code, both for static and dynamic loading.
 1148  */
 1149 static int
 1150 cryptodev_modevent(module_t mod, int type, void *unused)
 1151 {
 1152         switch (type) {
 1153         case MOD_LOAD:
 1154                 if (bootverbose)
 1155                         printf("crypto: <crypto device>\n");
 1156                 crypto_dev = make_dev(&crypto_cdevsw, 0, 
 1157                                       UID_ROOT, GID_WHEEL, 0666,
 1158                                       "crypto");
 1159                 return 0;
 1160         case MOD_UNLOAD:
 1161                 /*XXX disallow if active sessions */
 1162                 destroy_dev(crypto_dev);
 1163                 return 0;
 1164         }
 1165         return EINVAL;
 1166 }
 1167 
 1168 static moduledata_t cryptodev_mod = {
 1169         "cryptodev",
 1170         cryptodev_modevent,
 1171         0
 1172 };
 1173 MODULE_VERSION(cryptodev, 1);
 1174 DECLARE_MODULE(cryptodev, cryptodev_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
 1175 MODULE_DEPEND(cryptodev, crypto, 1, 1, 1);
 1176 MODULE_DEPEND(cryptodev, zlib, 1, 1, 1);

Cache object: 2be4409ad5adda2edcaeb116303b2713


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