linux/crypto/crypto_user.c
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   1/*
   2 * Crypto user configuration API.
   3 *
   4 * Copyright (C) 2011 secunet Security Networks AG
   5 * Copyright (C) 2011 Steffen Klassert <steffen.klassert@secunet.com>
   6 *
   7 * This program is free software; you can redistribute it and/or modify it
   8 * under the terms and conditions of the GNU General Public License,
   9 * version 2, as published by the Free Software Foundation.
  10 *
  11 * This program is distributed in the hope it will be useful, but WITHOUT
  12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14 * more details.
  15 *
  16 * You should have received a copy of the GNU General Public License along with
  17 * this program; if not, write to the Free Software Foundation, Inc.,
  18 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  19 */
  20
  21#include <linux/module.h>
  22#include <linux/crypto.h>
  23#include <linux/cryptouser.h>
  24#include <linux/sched.h>
  25#include <net/netlink.h>
  26#include <linux/security.h>
  27#include <net/net_namespace.h>
  28#include <crypto/internal/aead.h>
  29#include <crypto/internal/skcipher.h>
  30
  31#include "internal.h"
  32
  33static DEFINE_MUTEX(crypto_cfg_mutex);
  34
  35/* The crypto netlink socket */
  36static struct sock *crypto_nlsk;
  37
  38struct crypto_dump_info {
  39        struct sk_buff *in_skb;
  40        struct sk_buff *out_skb;
  41        u32 nlmsg_seq;
  42        u16 nlmsg_flags;
  43};
  44
  45static struct crypto_alg *crypto_alg_match(struct crypto_user_alg *p, int exact)
  46{
  47        struct crypto_alg *q, *alg = NULL;
  48
  49        down_read(&crypto_alg_sem);
  50
  51        list_for_each_entry(q, &crypto_alg_list, cra_list) {
  52                int match = 0;
  53
  54                if ((q->cra_flags ^ p->cru_type) & p->cru_mask)
  55                        continue;
  56
  57                if (strlen(p->cru_driver_name))
  58                        match = !strcmp(q->cra_driver_name,
  59                                        p->cru_driver_name);
  60                else if (!exact)
  61                        match = !strcmp(q->cra_name, p->cru_name);
  62
  63                if (match) {
  64                        alg = q;
  65                        break;
  66                }
  67        }
  68
  69        up_read(&crypto_alg_sem);
  70
  71        return alg;
  72}
  73
  74static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg)
  75{
  76        struct crypto_report_cipher rcipher;
  77
  78        snprintf(rcipher.type, CRYPTO_MAX_ALG_NAME, "%s", "cipher");
  79
  80        rcipher.blocksize = alg->cra_blocksize;
  81        rcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
  82        rcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
  83
  84        if (nla_put(skb, CRYPTOCFGA_REPORT_CIPHER,
  85                    sizeof(struct crypto_report_cipher), &rcipher))
  86                goto nla_put_failure;
  87        return 0;
  88
  89nla_put_failure:
  90        return -EMSGSIZE;
  91}
  92
  93static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg)
  94{
  95        struct crypto_report_comp rcomp;
  96
  97        snprintf(rcomp.type, CRYPTO_MAX_ALG_NAME, "%s", "compression");
  98
  99        if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
 100                    sizeof(struct crypto_report_comp), &rcomp))
 101                goto nla_put_failure;
 102        return 0;
 103
 104nla_put_failure:
 105        return -EMSGSIZE;
 106}
 107
 108static int crypto_report_one(struct crypto_alg *alg,
 109                             struct crypto_user_alg *ualg, struct sk_buff *skb)
 110{
 111        memcpy(&ualg->cru_name, &alg->cra_name, sizeof(ualg->cru_name));
 112        memcpy(&ualg->cru_driver_name, &alg->cra_driver_name,
 113               sizeof(ualg->cru_driver_name));
 114        memcpy(&ualg->cru_module_name, module_name(alg->cra_module),
 115               CRYPTO_MAX_ALG_NAME);
 116
 117        ualg->cru_flags = alg->cra_flags;
 118        ualg->cru_refcnt = atomic_read(&alg->cra_refcnt);
 119
 120        if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority))
 121                goto nla_put_failure;
 122        if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
 123                struct crypto_report_larval rl;
 124
 125                snprintf(rl.type, CRYPTO_MAX_ALG_NAME, "%s", "larval");
 126
 127                if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL,
 128                            sizeof(struct crypto_report_larval), &rl))
 129                        goto nla_put_failure;
 130                goto out;
 131        }
 132
 133        if (alg->cra_type && alg->cra_type->report) {
 134                if (alg->cra_type->report(skb, alg))
 135                        goto nla_put_failure;
 136
 137                goto out;
 138        }
 139
 140        switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) {
 141        case CRYPTO_ALG_TYPE_CIPHER:
 142                if (crypto_report_cipher(skb, alg))
 143                        goto nla_put_failure;
 144
 145                break;
 146        case CRYPTO_ALG_TYPE_COMPRESS:
 147                if (crypto_report_comp(skb, alg))
 148                        goto nla_put_failure;
 149
 150                break;
 151        }
 152
 153out:
 154        return 0;
 155
 156nla_put_failure:
 157        return -EMSGSIZE;
 158}
 159
 160static int crypto_report_alg(struct crypto_alg *alg,
 161                             struct crypto_dump_info *info)
 162{
 163        struct sk_buff *in_skb = info->in_skb;
 164        struct sk_buff *skb = info->out_skb;
 165        struct nlmsghdr *nlh;
 166        struct crypto_user_alg *ualg;
 167        int err = 0;
 168
 169        nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq,
 170                        CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags);
 171        if (!nlh) {
 172                err = -EMSGSIZE;
 173                goto out;
 174        }
 175
 176        ualg = nlmsg_data(nlh);
 177
 178        err = crypto_report_one(alg, ualg, skb);
 179        if (err) {
 180                nlmsg_cancel(skb, nlh);
 181                goto out;
 182        }
 183
 184        nlmsg_end(skb, nlh);
 185
 186out:
 187        return err;
 188}
 189
 190static int crypto_report(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
 191                         struct nlattr **attrs)
 192{
 193        struct crypto_user_alg *p = nlmsg_data(in_nlh);
 194        struct crypto_alg *alg;
 195        struct sk_buff *skb;
 196        struct crypto_dump_info info;
 197        int err;
 198
 199        if (!p->cru_driver_name)
 200                return -EINVAL;
 201
 202        alg = crypto_alg_match(p, 1);
 203        if (!alg)
 204                return -ENOENT;
 205
 206        skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 207        if (!skb)
 208                return -ENOMEM;
 209
 210        info.in_skb = in_skb;
 211        info.out_skb = skb;
 212        info.nlmsg_seq = in_nlh->nlmsg_seq;
 213        info.nlmsg_flags = 0;
 214
 215        err = crypto_report_alg(alg, &info);
 216        if (err)
 217                return err;
 218
 219        return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).portid);
 220}
 221
 222static int crypto_dump_report(struct sk_buff *skb, struct netlink_callback *cb)
 223{
 224        struct crypto_alg *alg;
 225        struct crypto_dump_info info;
 226        int err;
 227
 228        if (cb->args[0])
 229                goto out;
 230
 231        cb->args[0] = 1;
 232
 233        info.in_skb = cb->skb;
 234        info.out_skb = skb;
 235        info.nlmsg_seq = cb->nlh->nlmsg_seq;
 236        info.nlmsg_flags = NLM_F_MULTI;
 237
 238        list_for_each_entry(alg, &crypto_alg_list, cra_list) {
 239                err = crypto_report_alg(alg, &info);
 240                if (err)
 241                        goto out_err;
 242        }
 243
 244out:
 245        return skb->len;
 246out_err:
 247        return err;
 248}
 249
 250static int crypto_dump_report_done(struct netlink_callback *cb)
 251{
 252        return 0;
 253}
 254
 255static int crypto_update_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
 256                             struct nlattr **attrs)
 257{
 258        struct crypto_alg *alg;
 259        struct crypto_user_alg *p = nlmsg_data(nlh);
 260        struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
 261        LIST_HEAD(list);
 262
 263        if (priority && !strlen(p->cru_driver_name))
 264                return -EINVAL;
 265
 266        alg = crypto_alg_match(p, 1);
 267        if (!alg)
 268                return -ENOENT;
 269
 270        down_write(&crypto_alg_sem);
 271
 272        crypto_remove_spawns(alg, &list, NULL);
 273
 274        if (priority)
 275                alg->cra_priority = nla_get_u32(priority);
 276
 277        up_write(&crypto_alg_sem);
 278
 279        crypto_remove_final(&list);
 280
 281        return 0;
 282}
 283
 284static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
 285                          struct nlattr **attrs)
 286{
 287        struct crypto_alg *alg;
 288        struct crypto_user_alg *p = nlmsg_data(nlh);
 289
 290        alg = crypto_alg_match(p, 1);
 291        if (!alg)
 292                return -ENOENT;
 293
 294        /* We can not unregister core algorithms such as aes-generic.
 295         * We would loose the reference in the crypto_alg_list to this algorithm
 296         * if we try to unregister. Unregistering such an algorithm without
 297         * removing the module is not possible, so we restrict to crypto
 298         * instances that are build from templates. */
 299        if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
 300                return -EINVAL;
 301
 302        if (atomic_read(&alg->cra_refcnt) != 1)
 303                return -EBUSY;
 304
 305        return crypto_unregister_instance(alg);
 306}
 307
 308static struct crypto_alg *crypto_user_skcipher_alg(const char *name, u32 type,
 309                                                   u32 mask)
 310{
 311        int err;
 312        struct crypto_alg *alg;
 313
 314        type = crypto_skcipher_type(type);
 315        mask = crypto_skcipher_mask(mask);
 316
 317        for (;;) {
 318                alg = crypto_lookup_skcipher(name,  type, mask);
 319                if (!IS_ERR(alg))
 320                        return alg;
 321
 322                err = PTR_ERR(alg);
 323                if (err != -EAGAIN)
 324                        break;
 325                if (signal_pending(current)) {
 326                        err = -EINTR;
 327                        break;
 328                }
 329        }
 330
 331        return ERR_PTR( 325       3>. 325       3>. 3  325      2"6" class="line" name="L276"> 276
 267report_alg(EINTR;
alg);
((skbetST_HEAD(skbetST_H="L226"> 226        int                                                u32 mask)
{
        int err;
        struct crypto_alg *alg;

        type(&a= ~/a>(CRYPTO_ALG_TYMASKNCE" class="sref">CRYPTO_ALG_TYMASKypeCRYPTO_AGENIVa>       3>. 325        type = CRYPTO_ALG_TYAT_HEAD" class="sref">CRYPTO_ALG_TYAT_Halg;
        mask(&a= ~/a>(CRYPTO_ALG_TYMASKNCE" class="sref">CRYPTO_ALG_TYMASKypeCRYPTO_AGENIVa>       3>. 325 325<"L243" class="line" name3"L24334 233        mask = CRYPTO_ALG_TYMASKNCE" class="sref">CRYPTO_ALG_TYMASKype<    3>. 325
 245        for (;;) {
                alg = name,  type, mask);
                if (!IS_ERR(alg))
                        return alg;
 249
                err = PTR_ERR(alg);
                if (err != -EAGAIN)
                        break;
                if (signal_pending(current)) {
                        err = -EINTR;
                        break;
 256                return         return 
        return ERR_PTR( 325       3>. 325}

static int ((struct sk_buff *skb, struct nlmsghdr *nlh,
                          struct nlattr **attrs)
 264<)) {
        int  266     f">( 267        struct crypto_alg *alg;
        struct crypto_user_alg *p = nlmsg_data(nlh);
        struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];

        i> *strlen(p->cru_driver_name))
                 273
 274        if (priority && ! 275                return -EINVAL;
 276
 277        alg = crypto_alg_match(p        if (alg)
                return - 280
        i> *strlen(p->cru_driver_name))
                 = p->cru_driver_name;
     elsea>;
                 = p->cer_name;

      wi_ma if (p->type(&a> = p->mask(&a> = CRYPTO_ALG_TYMASKNCE" class="sref">CRYPTO_ALG_TYMASKype)) {
 287     case> = CRYPTO_ALG_TYAT_HEAD" class="sref">CRYPTO_ALG_TYAT_Halg:
                alg = (namep->typep->mask;
                break;
 290     case> = CRYPTO_ALG_TYGIVCIPHE_PTR" class="sref">CRYPTO_ALG_TYGIVCIPHE_alg:
 291     case> = CRYPTO_ALG_TYBLKCIPHE_PTR" class="sref">CRYPTO_ALG_TYBLKCIPHE_alg:
 292     case> = CRYPTO_ALG_TYABLKCIPHE_PTR" class="sref">CRYPTO_ALG_TYABLKCIPHE_alg:
                alg = crypto_user_skcipher_alg(namep->typep->mask;
                break;
     default/a>:
                alg = crypto_alodpto_looalg(namep->typep->mask;
        return 
 299        igt;IS_ERR(alg))
 300                retua>(PTR_ERR(alg);
 301
        down_write(&crypto_alg_sem);

        if (priority)
             a>(alg->cra_priority = nla_get_u32(priority);

        up_write(&crypto_alg_sem);

        alg);

        return 0;
 313
 314<#def="l    type(struct type

 316statf">(CRYPNR_MSGLG_TSVAL)) {
 317     /a>[CRYPMSG_NEWTO_317   -> = CRYPMSG_BASEalg" class="sref">CRYPMSG_BASEVAL   crypto_user_alg<)/a>,
 318     /a>[CRYPMSG_DELTO_317   -> = CRYPMSG_BASEalg" class="sref">CRYPMSG_BASEVAL   crypto_user_alg<)/a>,
 319     /a>[CRYPMSG_UPDATETO_319-> = CRYPMSG_BASEalg" class="sref">CRYPMSG_BASEVAL   crypto_user_alg<)/a>,
 320     /a>[CRYPMSG_GETTO_317   -> = CRYPMSG_BASEalg" class="sref">CRYPMSG_BASEVAL   crypto_user_alg<)/a>,
 321<}n 0;

 323statf">(CRYPTOCFMAXtrs<+1//a>)) {
 324     /a>[CRYPTOCFGA_PRIORITY_VAL) /a>.type =  325<}n 0;

 327<#undef>   
 329EINTR;
cryps="mype     ic i(a> *sk_buff, struct nlmsghdr, struct nlattr/a>);
        i(a> *sk_buff, struct netlink_callback);
.     ic i(a> *(struct netlink_callback);
      2"6" class="lin4" nam4="L276}int cryptispg_matrs[CRYPNR_MSGLG_TSVAL)) {
 267report_alg4/a>(<43 324     /a>[CRYPMSG_NEWTO_317   -> = CRYPMSG_BASEalg" class="sref">CRYPMSG_BASEVAL) /a>.(,
 226     /a>[CRYPMSG_DELTO_317   -> = CRYPMSG_BASEalg" class="sref">CRYPMSG_BASEVAL) /a>.crypto_del_alg<}/a>,
     /a>[CRYPMSG_UPDATETO_319-> = CRYPMSG_BASEalg" class="sref">CRYPMSG_BASEVAL) /a>.crypto_update_alg<}/a>,
     /a>[CRYPMSG_GETTO_317   -> = CRYPMSG_BASEalg" class="sref">CRYPMSG_BASEVAL) /a>.                                                    /a>.                                                    /a>. = 
static int crypto_usrcvp>nlERR(struct sk_buff *skb, struct nlmsghdr *nlh
 3254"L243" class="line" name4"L24344 233<)) {
        struct nlattr *attrs[CRYPTOCFMAXtrs<+1/n 0;
 245     R" class="sref">EINTR;
cryps="mype *     ic int type, err;

     a>.type = nlh->nlmde=type" class="sref">nlmde=terr;
        igt;type-&> = CRYPMSG_MAXalg" class="sref">CRYPMSG_MAXnlh
                return -EINVAL;

        type = CRYPMSG_BASEalg" class="sref">CRYPMSG_BASEVAL;
 3254"L253" class="line" name4"L25345 233        a>(&cryptispg_matrs[type
        if (! 256                return -
        iigt;typeCRYPMSG_GETTO_317 = CRYPMSG_BASEalg" class="sref">CRYPMSG_BASEVAL<)/a> &&a/a>
         /a>(nlh->nlmra_flags" class="sref">nlmra_flype(&a> =                 struct crypto_alg *alg;
             > *
                igt;->                        return -EINVAL;

                alg<,>a>(&crypto_alg_lype, clg_lalg" class="sref"aalg_lype
 267     /a>                CRYPREPORT_MAXSIZEalg" class="sref">CRYPREPORT_MAXSIZEVAL;

             )) {
                     a>(struct netlidumdpcontrol316<                                 /a>.->                             /a>. = ->,
                             /a>.                     }n 0;
 275                        retua>(netlidumdpstar=out" class="sref">netlidumdpstar=ERR(crypnl_mype, skb(nlh<,>a>(&                return         return 
        err = nlmparstype" class="sref">nlmparstERR(nlh<,>a>(typea>(attrs<,>a>(CRYPTOCFMAXtrs,
                                  i> *err
                retua>(err;

        if (->                return -EINVAL;

 287        retua>(->skb(nlh<,>a>(attrs);

 290statvoid    netlircvask" class="sref">crypn">netlircvERR(struct sk_buff *skb
 291<)) {
        crypcflmmutextrs);
        netlircv_de=skb" class="sren">netlircv_de=alg *skb(&crypto_usrcvp>nlERR);
        crypcflmmutextrs);

static int crypto_usini=out" class="srec">crypto_usini=ERR
        struct netlikernelpcflskb" class="sren">netlikernelpcfl316<     300             /a>.netlircvask" class="sref">crypn">netlircvERR,
     }n 0;

        crypnl_mype = netlikernelpcreawrite" class="sref">netlikernelpcreawrERR(&out" class="sreini=pn">nlh<,>a>(CRYVAL" class="sreNETLINK_f">CRYskb(&        if (!crypnl_mype
                return -
        return 0;

statvoid    crypto_usexi=out" class="srec">crypto_usexi=ERR
        netlikernelpreleastype" class="sref">netlikernelpreleastERR(crypnl_mype);
 313<   return 
crypto_usini=ERR);
 316<   crypto_usexi=ERR);
 317("GPL");
 318("Steffen K" clert/<steffen.k" clert@secuf">.coma>-&");
 319("Co/cry to_uspacetf">figur>ston API");
 320<


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