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/9.1/sys/opencrypto/cryptodev.c 224914 2011-08-16 20:07:47Z kib $");
   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     .fo_chmod = invfo_chmod,
  306     .fo_chown = invfo_chown,
  307 };
  308 
  309 static struct csession *csefind(struct fcrypt *, u_int);
  310 static int csedelete(struct fcrypt *, struct csession *);
  311 static struct csession *cseadd(struct fcrypt *, struct csession *);
  312 static struct csession *csecreate(struct fcrypt *, u_int64_t, caddr_t,
  313     u_int64_t, caddr_t, u_int64_t, u_int32_t, u_int32_t, struct enc_xform *,
  314     struct auth_hash *);
  315 static int csefree(struct csession *);
  316 
  317 static  int cryptodev_op(struct csession *, struct crypt_op *,
  318                         struct ucred *, struct thread *td);
  319 static  int cryptodev_key(struct crypt_kop *);
  320 static  int cryptodev_find(struct crypt_find_op *);
  321 
  322 static int
  323 cryptof_rw(
  324         struct file *fp,
  325         struct uio *uio,
  326         struct ucred *active_cred,
  327         int flags,
  328         struct thread *td)
  329 {
  330 
  331         return (EIO);
  332 }
  333 
  334 static int
  335 cryptof_truncate(
  336         struct file *fp,
  337         off_t length,
  338         struct ucred *active_cred,
  339         struct thread *td)
  340 {
  341 
  342         return (EINVAL);
  343 }
  344 
  345 /*
  346  * Check a crypto identifier to see if it requested
  347  * a software device/driver.  This can be done either
  348  * by device name/class or through search constraints.
  349  */
  350 static int
  351 checkforsoftware(int crid)
  352 {
  353         if (crid & CRYPTOCAP_F_SOFTWARE)
  354                 return EINVAL;          /* XXX */
  355         if ((crid & CRYPTOCAP_F_HARDWARE) == 0 &&
  356             (crypto_getcaps(crid) & CRYPTOCAP_F_HARDWARE) == 0)
  357                 return EINVAL;          /* XXX */
  358         return 0;
  359 }
  360 
  361 /* ARGSUSED */
  362 static int
  363 cryptof_ioctl(
  364         struct file *fp,
  365         u_long cmd,
  366         void *data,
  367         struct ucred *active_cred,
  368         struct thread *td)
  369 {
  370 #define SES2(p) ((struct session2_op *)p)
  371         struct cryptoini cria, crie;
  372         struct fcrypt *fcr = fp->f_data;
  373         struct csession *cse;
  374         struct session_op *sop;
  375         struct crypt_op *cop;
  376         struct enc_xform *txform = NULL;
  377         struct auth_hash *thash = NULL;
  378         struct crypt_kop *kop;
  379         u_int64_t sid;
  380         u_int32_t ses;
  381         int error = 0, crid;
  382 #ifdef COMPAT_FREEBSD32
  383         struct session2_op sopc;
  384         struct crypt_op copc;
  385         struct crypt_kop kopc;
  386 #endif
  387 
  388         switch (cmd) {
  389         case CIOCGSESSION:
  390         case CIOCGSESSION2:
  391 #ifdef COMPAT_FREEBSD32
  392         case CIOCGSESSION32:
  393         case CIOCGSESSION232:
  394                 if (cmd == CIOCGSESSION32) {
  395                         session_op_from_32(data, (struct session_op *)&sopc);
  396                         sop = (struct session_op *)&sopc;
  397                 } else if (cmd == CIOCGSESSION232) {
  398                         session2_op_from_32(data, &sopc);
  399                         sop = (struct session_op *)&sopc;
  400                 } else
  401 #endif
  402                         sop = (struct session_op *)data;
  403                 switch (sop->cipher) {
  404                 case 0:
  405                         break;
  406                 case CRYPTO_DES_CBC:
  407                         txform = &enc_xform_des;
  408                         break;
  409                 case CRYPTO_3DES_CBC:
  410                         txform = &enc_xform_3des;
  411                         break;
  412                 case CRYPTO_BLF_CBC:
  413                         txform = &enc_xform_blf;
  414                         break;
  415                 case CRYPTO_CAST_CBC:
  416                         txform = &enc_xform_cast5;
  417                         break;
  418                 case CRYPTO_SKIPJACK_CBC:
  419                         txform = &enc_xform_skipjack;
  420                         break;
  421                 case CRYPTO_AES_CBC:
  422                         txform = &enc_xform_rijndael128;
  423                         break;
  424                 case CRYPTO_AES_XTS:
  425                         txform = &enc_xform_aes_xts;
  426                         break;
  427                 case CRYPTO_NULL_CBC:
  428                         txform = &enc_xform_null;
  429                         break;
  430                 case CRYPTO_ARC4:
  431                         txform = &enc_xform_arc4;
  432                         break;
  433                 case CRYPTO_CAMELLIA_CBC:
  434                         txform = &enc_xform_camellia;
  435                         break;
  436                 default:
  437                         return (EINVAL);
  438                 }
  439 
  440                 switch (sop->mac) {
  441                 case 0:
  442                         break;
  443                 case CRYPTO_MD5_HMAC:
  444                         thash = &auth_hash_hmac_md5;
  445                         break;
  446                 case CRYPTO_SHA1_HMAC:
  447                         thash = &auth_hash_hmac_sha1;
  448                         break;
  449                 case CRYPTO_SHA2_256_HMAC:
  450                         thash = &auth_hash_hmac_sha2_256;
  451                         break;
  452                 case CRYPTO_SHA2_384_HMAC:
  453                         thash = &auth_hash_hmac_sha2_384;
  454                         break;
  455                 case CRYPTO_SHA2_512_HMAC:
  456                         thash = &auth_hash_hmac_sha2_512;
  457                         break;
  458                 case CRYPTO_RIPEMD160_HMAC:
  459                         thash = &auth_hash_hmac_ripemd_160;
  460                         break;
  461 #ifdef notdef
  462                 case CRYPTO_MD5:
  463                         thash = &auth_hash_md5;
  464                         break;
  465                 case CRYPTO_SHA1:
  466                         thash = &auth_hash_sha1;
  467                         break;
  468 #endif
  469                 case CRYPTO_NULL_HMAC:
  470                         thash = &auth_hash_null;
  471                         break;
  472                 default:
  473                         return (EINVAL);
  474                 }
  475 
  476                 bzero(&crie, sizeof(crie));
  477                 bzero(&cria, sizeof(cria));
  478 
  479                 if (txform) {
  480                         crie.cri_alg = txform->type;
  481                         crie.cri_klen = sop->keylen * 8;
  482                         if (sop->keylen > txform->maxkey ||
  483                             sop->keylen < txform->minkey) {
  484                                 error = EINVAL;
  485                                 goto bail;
  486                         }
  487 
  488                         crie.cri_key = malloc(crie.cri_klen / 8,
  489                             M_XDATA, M_WAITOK);
  490                         if ((error = copyin(sop->key, crie.cri_key,
  491                             crie.cri_klen / 8)))
  492                                 goto bail;
  493                         if (thash)
  494                                 crie.cri_next = &cria;
  495                 }
  496 
  497                 if (thash) {
  498                         cria.cri_alg = thash->type;
  499                         cria.cri_klen = sop->mackeylen * 8;
  500                         if (sop->mackeylen != thash->keysize) {
  501                                 error = EINVAL;
  502                                 goto bail;
  503                         }
  504 
  505                         if (cria.cri_klen) {
  506                                 cria.cri_key = malloc(cria.cri_klen / 8,
  507                                     M_XDATA, M_WAITOK);
  508                                 if ((error = copyin(sop->mackey, cria.cri_key,
  509                                     cria.cri_klen / 8)))
  510                                         goto bail;
  511                         }
  512                 }
  513 
  514                 /* NB: CIOCGSESSION2 has the crid */
  515                 if (cmd == CIOCGSESSION2
  516 #ifdef COMPAT_FREEBSD32
  517                     || cmd == CIOCGSESSION232
  518 #endif
  519                         ) {
  520                         crid = SES2(sop)->crid;
  521                         error = checkforsoftware(crid);
  522                         if (error)
  523                                 goto bail;
  524                 } else
  525                         crid = CRYPTOCAP_F_HARDWARE;
  526                 error = crypto_newsession(&sid, (txform ? &crie : &cria), crid);
  527                 if (error)
  528                         goto bail;
  529 
  530                 cse = csecreate(fcr, sid, crie.cri_key, crie.cri_klen,
  531                     cria.cri_key, cria.cri_klen, sop->cipher, sop->mac, txform,
  532                     thash);
  533 
  534                 if (cse == NULL) {
  535                         crypto_freesession(sid);
  536                         error = EINVAL;
  537                         goto bail;
  538                 }
  539                 sop->ses = cse->ses;
  540                 if (cmd == CIOCGSESSION2
  541 #ifdef COMPAT_FREEBSD32
  542                     || cmd == CIOCGSESSION232
  543 #endif
  544                     ) {
  545                         /* return hardware/driver id */
  546                         SES2(sop)->crid = CRYPTO_SESID2HID(cse->sid);
  547                 }
  548 bail:
  549                 if (error) {
  550                         if (crie.cri_key)
  551                                 free(crie.cri_key, M_XDATA);
  552                         if (cria.cri_key)
  553                                 free(cria.cri_key, M_XDATA);
  554                 }
  555 #ifdef COMPAT_FREEBSD32
  556                 else {
  557                         if (cmd == CIOCGSESSION32)
  558                                 session_op_to_32(sop, data);
  559                         else if (cmd == CIOCGSESSION232)
  560                                 session2_op_to_32((struct session2_op *)sop,
  561                                     data);
  562                 }
  563 #endif
  564                 break;
  565         case CIOCFSESSION:
  566                 ses = *(u_int32_t *)data;
  567                 cse = csefind(fcr, ses);
  568                 if (cse == NULL)
  569                         return (EINVAL);
  570                 csedelete(fcr, cse);
  571                 error = csefree(cse);
  572                 break;
  573         case CIOCCRYPT:
  574 #ifdef COMPAT_FREEBSD32
  575         case CIOCCRYPT32:
  576                 if (cmd == CIOCCRYPT32) {
  577                         cop = &copc;
  578                         crypt_op_from_32(data, cop);
  579                 } else
  580 #endif
  581                         cop = (struct crypt_op *)data;
  582                 cse = csefind(fcr, cop->ses);
  583                 if (cse == NULL)
  584                         return (EINVAL);
  585                 error = cryptodev_op(cse, cop, active_cred, td);
  586 #ifdef COMPAT_FREEBSD32
  587                 if (error == 0 && cmd == CIOCCRYPT32)
  588                         crypt_op_to_32(cop, data);
  589 #endif
  590                 break;
  591         case CIOCKEY:
  592         case CIOCKEY2:
  593 #ifdef COMPAT_FREEBSD32
  594         case CIOCKEY32:
  595         case CIOCKEY232:
  596 #endif
  597                 if (!crypto_userasymcrypto)
  598                         return (EPERM);         /* XXX compat? */
  599 #ifdef COMPAT_FREEBSD32
  600                 if (cmd == CIOCKEY32 || cmd == CIOCKEY232) {
  601                         kop = &kopc;
  602                         crypt_kop_from_32(data, kop);
  603                 } else
  604 #endif
  605                         kop = (struct crypt_kop *)data;
  606                 if (cmd == CIOCKEY
  607 #ifdef COMPAT_FREEBSD32
  608                     || cmd == CIOCKEY32
  609 #endif
  610                     ) {
  611                         /* NB: crypto core enforces s/w driver use */
  612                         kop->crk_crid =
  613                             CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE;
  614                 }
  615                 mtx_lock(&Giant);
  616                 error = cryptodev_key(kop);
  617                 mtx_unlock(&Giant);
  618 #ifdef COMPAT_FREEBSD32
  619                 if (cmd == CIOCKEY32 || cmd == CIOCKEY232)
  620                         crypt_kop_to_32(kop, data);
  621 #endif
  622                 break;
  623         case CIOCASYMFEAT:
  624                 if (!crypto_userasymcrypto) {
  625                         /*
  626                          * NB: if user asym crypto operations are
  627                          * not permitted return "no algorithms"
  628                          * so well-behaved applications will just
  629                          * fallback to doing them in software.
  630                          */
  631                         *(int *)data = 0;
  632                 } else
  633                         error = crypto_getfeat((int *)data);
  634                 break;
  635         case CIOCFINDDEV:
  636                 error = cryptodev_find((struct crypt_find_op *)data);
  637                 break;
  638         default:
  639                 error = EINVAL;
  640                 break;
  641         }
  642         return (error);
  643 #undef SES2
  644 }
  645 
  646 static int cryptodev_cb(void *);
  647 
  648 
  649 static int
  650 cryptodev_op(
  651         struct csession *cse,
  652         struct crypt_op *cop,
  653         struct ucred *active_cred,
  654         struct thread *td)
  655 {
  656         struct cryptop *crp = NULL;
  657         struct cryptodesc *crde = NULL, *crda = NULL;
  658         int error;
  659 
  660         if (cop->len > 256*1024-4)
  661                 return (E2BIG);
  662 
  663         if (cse->txform) {
  664                 if (cop->len == 0 || (cop->len % cse->txform->blocksize) != 0)
  665                         return (EINVAL);
  666         }
  667 
  668         cse->uio.uio_iov = &cse->iovec;
  669         cse->uio.uio_iovcnt = 1;
  670         cse->uio.uio_offset = 0;
  671         cse->uio.uio_resid = cop->len;
  672         cse->uio.uio_segflg = UIO_SYSSPACE;
  673         cse->uio.uio_rw = UIO_WRITE;
  674         cse->uio.uio_td = td;
  675         cse->uio.uio_iov[0].iov_len = cop->len;
  676         if (cse->thash) {
  677                 cse->uio.uio_iov[0].iov_len += cse->thash->hashsize;
  678                 cse->uio.uio_resid += cse->thash->hashsize;
  679         }
  680         cse->uio.uio_iov[0].iov_base = malloc(cse->uio.uio_iov[0].iov_len,
  681             M_XDATA, M_WAITOK);
  682 
  683         crp = crypto_getreq((cse->txform != NULL) + (cse->thash != NULL));
  684         if (crp == NULL) {
  685                 error = ENOMEM;
  686                 goto bail;
  687         }
  688 
  689         if (cse->thash) {
  690                 crda = crp->crp_desc;
  691                 if (cse->txform)
  692                         crde = crda->crd_next;
  693         } else {
  694                 if (cse->txform)
  695                         crde = crp->crp_desc;
  696                 else {
  697                         error = EINVAL;
  698                         goto bail;
  699                 }
  700         }
  701 
  702         if ((error = copyin(cop->src, cse->uio.uio_iov[0].iov_base, cop->len)))
  703                 goto bail;
  704 
  705         if (crda) {
  706                 crda->crd_skip = 0;
  707                 crda->crd_len = cop->len;
  708                 crda->crd_inject = cop->len;
  709 
  710                 crda->crd_alg = cse->mac;
  711                 crda->crd_key = cse->mackey;
  712                 crda->crd_klen = cse->mackeylen * 8;
  713         }
  714 
  715         if (crde) {
  716                 if (cop->op == COP_ENCRYPT)
  717                         crde->crd_flags |= CRD_F_ENCRYPT;
  718                 else
  719                         crde->crd_flags &= ~CRD_F_ENCRYPT;
  720                 crde->crd_len = cop->len;
  721                 crde->crd_inject = 0;
  722 
  723                 crde->crd_alg = cse->cipher;
  724                 crde->crd_key = cse->key;
  725                 crde->crd_klen = cse->keylen * 8;
  726         }
  727 
  728         crp->crp_ilen = cop->len;
  729         crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIMM
  730                        | (cop->flags & COP_F_BATCH);
  731         crp->crp_buf = (caddr_t)&cse->uio;
  732         crp->crp_callback = (int (*) (struct cryptop *)) cryptodev_cb;
  733         crp->crp_sid = cse->sid;
  734         crp->crp_opaque = (void *)cse;
  735 
  736         if (cop->iv) {
  737                 if (crde == NULL) {
  738                         error = EINVAL;
  739                         goto bail;
  740                 }
  741                 if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */
  742                         error = EINVAL;
  743                         goto bail;
  744                 }
  745                 if ((error = copyin(cop->iv, cse->tmp_iv, cse->txform->blocksize)))
  746                         goto bail;
  747                 bcopy(cse->tmp_iv, crde->crd_iv, cse->txform->blocksize);
  748                 crde->crd_flags |= CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
  749                 crde->crd_skip = 0;
  750         } else if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */
  751                 crde->crd_skip = 0;
  752         } else if (crde) {
  753                 crde->crd_flags |= CRD_F_IV_PRESENT;
  754                 crde->crd_skip = cse->txform->blocksize;
  755                 crde->crd_len -= cse->txform->blocksize;
  756         }
  757 
  758         if (cop->mac && crda == NULL) {
  759                 error = EINVAL;
  760                 goto bail;
  761         }
  762 
  763 again:
  764         /*
  765          * Let the dispatch run unlocked, then, interlock against the
  766          * callback before checking if the operation completed and going
  767          * to sleep.  This insures drivers don't inherit our lock which
  768          * results in a lock order reversal between crypto_dispatch forced
  769          * entry and the crypto_done callback into us.
  770          */
  771         error = crypto_dispatch(crp);
  772         mtx_lock(&cse->lock);
  773         if (error == 0 && (crp->crp_flags & CRYPTO_F_DONE) == 0)
  774                 error = msleep(crp, &cse->lock, PWAIT, "crydev", 0);
  775         mtx_unlock(&cse->lock);
  776 
  777         if (error != 0)
  778                 goto bail;
  779 
  780         if (crp->crp_etype == EAGAIN) {
  781                 crp->crp_etype = 0;
  782                 crp->crp_flags &= ~CRYPTO_F_DONE;
  783                 goto again;
  784         }
  785 
  786         if (crp->crp_etype != 0) {
  787                 error = crp->crp_etype;
  788                 goto bail;
  789         }
  790 
  791         if (cse->error) {
  792                 error = cse->error;
  793                 goto bail;
  794         }
  795 
  796         if (cop->dst &&
  797             (error = copyout(cse->uio.uio_iov[0].iov_base, cop->dst, cop->len)))
  798                 goto bail;
  799 
  800         if (cop->mac &&
  801             (error = copyout((caddr_t)cse->uio.uio_iov[0].iov_base + cop->len,
  802             cop->mac, cse->thash->hashsize)))
  803                 goto bail;
  804 
  805 bail:
  806         if (crp)
  807                 crypto_freereq(crp);
  808         if (cse->uio.uio_iov[0].iov_base)
  809                 free(cse->uio.uio_iov[0].iov_base, M_XDATA);
  810 
  811         return (error);
  812 }
  813 
  814 static int
  815 cryptodev_cb(void *op)
  816 {
  817         struct cryptop *crp = (struct cryptop *) op;
  818         struct csession *cse = (struct csession *)crp->crp_opaque;
  819 
  820         mtx_lock(&cse->lock);
  821         cse->error = crp->crp_etype;
  822         wakeup_one(crp);
  823         mtx_unlock(&cse->lock);
  824         return (0);
  825 }
  826 
  827 static int
  828 cryptodevkey_cb(void *op)
  829 {
  830         struct cryptkop *krp = (struct cryptkop *) op;
  831 
  832         wakeup_one(krp);
  833         return (0);
  834 }
  835 
  836 static int
  837 cryptodev_key(struct crypt_kop *kop)
  838 {
  839         struct cryptkop *krp = NULL;
  840         int error = EINVAL;
  841         int in, out, size, i;
  842 
  843         if (kop->crk_iparams + kop->crk_oparams > CRK_MAXPARAM) {
  844                 return (EFBIG);
  845         }
  846 
  847         in = kop->crk_iparams;
  848         out = kop->crk_oparams;
  849         switch (kop->crk_op) {
  850         case CRK_MOD_EXP:
  851                 if (in == 3 && out == 1)
  852                         break;
  853                 return (EINVAL);
  854         case CRK_MOD_EXP_CRT:
  855                 if (in == 6 && out == 1)
  856                         break;
  857                 return (EINVAL);
  858         case CRK_DSA_SIGN:
  859                 if (in == 5 && out == 2)
  860                         break;
  861                 return (EINVAL);
  862         case CRK_DSA_VERIFY:
  863                 if (in == 7 && out == 0)
  864                         break;
  865                 return (EINVAL);
  866         case CRK_DH_COMPUTE_KEY:
  867                 if (in == 3 && out == 1)
  868                         break;
  869                 return (EINVAL);
  870         default:
  871                 return (EINVAL);
  872         }
  873 
  874         krp = (struct cryptkop *)malloc(sizeof *krp, M_XDATA, M_WAITOK|M_ZERO);
  875         if (!krp)
  876                 return (ENOMEM);
  877         krp->krp_op = kop->crk_op;
  878         krp->krp_status = kop->crk_status;
  879         krp->krp_iparams = kop->crk_iparams;
  880         krp->krp_oparams = kop->crk_oparams;
  881         krp->krp_crid = kop->crk_crid;
  882         krp->krp_status = 0;
  883         krp->krp_callback = (int (*) (struct cryptkop *)) cryptodevkey_cb;
  884 
  885         for (i = 0; i < CRK_MAXPARAM; i++) {
  886                 if (kop->crk_param[i].crp_nbits > 65536)
  887                         /* Limit is the same as in OpenBSD */
  888                         goto fail;
  889                 krp->krp_param[i].crp_nbits = kop->crk_param[i].crp_nbits;
  890         }
  891         for (i = 0; i < krp->krp_iparams + krp->krp_oparams; i++) {
  892                 size = (krp->krp_param[i].crp_nbits + 7) / 8;
  893                 if (size == 0)
  894                         continue;
  895                 krp->krp_param[i].crp_p = malloc(size, M_XDATA, M_WAITOK);
  896                 if (i >= krp->krp_iparams)
  897                         continue;
  898                 error = copyin(kop->crk_param[i].crp_p, krp->krp_param[i].crp_p, size);
  899                 if (error)
  900                         goto fail;
  901         }
  902 
  903         error = crypto_kdispatch(krp);
  904         if (error)
  905                 goto fail;
  906         error = tsleep(krp, PSOCK, "crydev", 0);
  907         if (error) {
  908                 /* XXX can this happen?  if so, how do we recover? */
  909                 goto fail;
  910         }
  911         
  912         kop->crk_crid = krp->krp_crid;          /* device that did the work */
  913         if (krp->krp_status != 0) {
  914                 error = krp->krp_status;
  915                 goto fail;
  916         }
  917 
  918         for (i = krp->krp_iparams; i < krp->krp_iparams + krp->krp_oparams; i++) {
  919                 size = (krp->krp_param[i].crp_nbits + 7) / 8;
  920                 if (size == 0)
  921                         continue;
  922                 error = copyout(krp->krp_param[i].crp_p, kop->crk_param[i].crp_p, size);
  923                 if (error)
  924                         goto fail;
  925         }
  926 
  927 fail:
  928         if (krp) {
  929                 kop->crk_status = krp->krp_status;
  930                 for (i = 0; i < CRK_MAXPARAM; i++) {
  931                         if (krp->krp_param[i].crp_p)
  932                                 free(krp->krp_param[i].crp_p, M_XDATA);
  933                 }
  934                 free(krp, M_XDATA);
  935         }
  936         return (error);
  937 }
  938 
  939 static int
  940 cryptodev_find(struct crypt_find_op *find)
  941 {
  942         device_t dev;
  943 
  944         if (find->crid != -1) {
  945                 dev = crypto_find_device_byhid(find->crid);
  946                 if (dev == NULL)
  947                         return (ENOENT);
  948                 strlcpy(find->name, device_get_nameunit(dev),
  949                     sizeof(find->name));
  950         } else {
  951                 find->crid = crypto_find_driver(find->name);
  952                 if (find->crid == -1)
  953                         return (ENOENT);
  954         }
  955         return (0);
  956 }
  957 
  958 /* ARGSUSED */
  959 static int
  960 cryptof_poll(
  961         struct file *fp,
  962         int events,
  963         struct ucred *active_cred,
  964         struct thread *td)
  965 {
  966 
  967         return (0);
  968 }
  969 
  970 /* ARGSUSED */
  971 static int
  972 cryptof_kqfilter(struct file *fp, struct knote *kn)
  973 {
  974 
  975         return (0);
  976 }
  977 
  978 /* ARGSUSED */
  979 static int
  980 cryptof_stat(
  981         struct file *fp,
  982         struct stat *sb,
  983         struct ucred *active_cred,
  984         struct thread *td)
  985 {
  986 
  987         return (EOPNOTSUPP);
  988 }
  989 
  990 /* ARGSUSED */
  991 static int
  992 cryptof_close(struct file *fp, struct thread *td)
  993 {
  994         struct fcrypt *fcr = fp->f_data;
  995         struct csession *cse;
  996 
  997         while ((cse = TAILQ_FIRST(&fcr->csessions))) {
  998                 TAILQ_REMOVE(&fcr->csessions, cse, next);
  999                 (void)csefree(cse);
 1000         }
 1001         free(fcr, M_XDATA);
 1002         fp->f_data = NULL;
 1003         return 0;
 1004 }
 1005 
 1006 static struct csession *
 1007 csefind(struct fcrypt *fcr, u_int ses)
 1008 {
 1009         struct csession *cse;
 1010 
 1011         TAILQ_FOREACH(cse, &fcr->csessions, next)
 1012                 if (cse->ses == ses)
 1013                         return (cse);
 1014         return (NULL);
 1015 }
 1016 
 1017 static int
 1018 csedelete(struct fcrypt *fcr, struct csession *cse_del)
 1019 {
 1020         struct csession *cse;
 1021 
 1022         TAILQ_FOREACH(cse, &fcr->csessions, next) {
 1023                 if (cse == cse_del) {
 1024                         TAILQ_REMOVE(&fcr->csessions, cse, next);
 1025                         return (1);
 1026                 }
 1027         }
 1028         return (0);
 1029 }
 1030         
 1031 static struct csession *
 1032 cseadd(struct fcrypt *fcr, struct csession *cse)
 1033 {
 1034         TAILQ_INSERT_TAIL(&fcr->csessions, cse, next);
 1035         cse->ses = fcr->sesn++;
 1036         return (cse);
 1037 }
 1038 
 1039 struct csession *
 1040 csecreate(struct fcrypt *fcr, u_int64_t sid, caddr_t key, u_int64_t keylen,
 1041     caddr_t mackey, u_int64_t mackeylen, u_int32_t cipher, u_int32_t mac,
 1042     struct enc_xform *txform, struct auth_hash *thash)
 1043 {
 1044         struct csession *cse;
 1045 
 1046 #ifdef INVARIANTS
 1047         /* NB: required when mtx_init is built with INVARIANTS */
 1048         cse = malloc(sizeof(struct csession), M_XDATA, M_NOWAIT | M_ZERO);
 1049 #else
 1050         cse = malloc(sizeof(struct csession), M_XDATA, M_NOWAIT);
 1051 #endif
 1052         if (cse == NULL)
 1053                 return NULL;
 1054         mtx_init(&cse->lock, "cryptodev", "crypto session lock", MTX_DEF);
 1055         cse->key = key;
 1056         cse->keylen = keylen/8;
 1057         cse->mackey = mackey;
 1058         cse->mackeylen = mackeylen/8;
 1059         cse->sid = sid;
 1060         cse->cipher = cipher;
 1061         cse->mac = mac;
 1062         cse->txform = txform;
 1063         cse->thash = thash;
 1064         cseadd(fcr, cse);
 1065         return (cse);
 1066 }
 1067 
 1068 static int
 1069 csefree(struct csession *cse)
 1070 {
 1071         int error;
 1072 
 1073         error = crypto_freesession(cse->sid);
 1074         mtx_destroy(&cse->lock);
 1075         if (cse->key)
 1076                 free(cse->key, M_XDATA);
 1077         if (cse->mackey)
 1078                 free(cse->mackey, M_XDATA);
 1079         free(cse, M_XDATA);
 1080         return (error);
 1081 }
 1082 
 1083 static int
 1084 cryptoopen(struct cdev *dev, int oflags, int devtype, struct thread *td)
 1085 {
 1086         return (0);
 1087 }
 1088 
 1089 static int
 1090 cryptoread(struct cdev *dev, struct uio *uio, int ioflag)
 1091 {
 1092         return (EIO);
 1093 }
 1094 
 1095 static int
 1096 cryptowrite(struct cdev *dev, struct uio *uio, int ioflag)
 1097 {
 1098         return (EIO);
 1099 }
 1100 
 1101 static int
 1102 cryptoioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
 1103 {
 1104         struct file *f;
 1105         struct fcrypt *fcr;
 1106         int fd, error;
 1107 
 1108         switch (cmd) {
 1109         case CRIOGET:
 1110                 fcr = malloc(sizeof(struct fcrypt), M_XDATA, M_WAITOK);
 1111                 TAILQ_INIT(&fcr->csessions);
 1112                 fcr->sesn = 0;
 1113 
 1114                 error = falloc(td, &f, &fd, 0);
 1115 
 1116                 if (error) {
 1117                         free(fcr, M_XDATA);
 1118                         return (error);
 1119                 }
 1120                 /* falloc automatically provides an extra reference to 'f'. */
 1121                 finit(f, FREAD | FWRITE, DTYPE_CRYPTO, fcr, &cryptofops);
 1122                 *(u_int32_t *)data = fd;
 1123                 fdrop(f, td);
 1124                 break;
 1125         case CRIOFINDDEV:
 1126                 error = cryptodev_find((struct crypt_find_op *)data);
 1127                 break;
 1128         case CRIOASYMFEAT:
 1129                 error = crypto_getfeat((int *)data);
 1130                 break;
 1131         default:
 1132                 error = EINVAL;
 1133                 break;
 1134         }
 1135         return (error);
 1136 }
 1137 
 1138 static struct cdevsw crypto_cdevsw = {
 1139         .d_version =    D_VERSION,
 1140         .d_flags =      D_NEEDGIANT,
 1141         .d_open =       cryptoopen,
 1142         .d_read =       cryptoread,
 1143         .d_write =      cryptowrite,
 1144         .d_ioctl =      cryptoioctl,
 1145         .d_name =       "crypto",
 1146 };
 1147 static struct cdev *crypto_dev;
 1148 
 1149 /*
 1150  * Initialization code, both for static and dynamic loading.
 1151  */
 1152 static int
 1153 cryptodev_modevent(module_t mod, int type, void *unused)
 1154 {
 1155         switch (type) {
 1156         case MOD_LOAD:
 1157                 if (bootverbose)
 1158                         printf("crypto: <crypto device>\n");
 1159                 crypto_dev = make_dev(&crypto_cdevsw, 0, 
 1160                                       UID_ROOT, GID_WHEEL, 0666,
 1161                                       "crypto");
 1162                 return 0;
 1163         case MOD_UNLOAD:
 1164                 /*XXX disallow if active sessions */
 1165                 destroy_dev(crypto_dev);
 1166                 return 0;
 1167         }
 1168         return EINVAL;
 1169 }
 1170 
 1171 static moduledata_t cryptodev_mod = {
 1172         "cryptodev",
 1173         cryptodev_modevent,
 1174         0
 1175 };
 1176 MODULE_VERSION(cryptodev, 1);
 1177 DECLARE_MODULE(cryptodev, cryptodev_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
 1178 MODULE_DEPEND(cryptodev, crypto, 1, 1, 1);
 1179 MODULE_DEPEND(cryptodev, zlib, 1, 1, 1);

Cache object: 3cc43ab0962e23a31aaf56709ba46523


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