Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 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> |
Steffen Klassert | 1e12299 | 2012-03-29 09:03:47 +0200 | [diff] [blame] | 24 | #include <linux/sched.h> |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 25 | #include <net/netlink.h> |
| 26 | #include <linux/security.h> |
| 27 | #include <net/net_namespace.h> |
Steffen Klassert | 1e12299 | 2012-03-29 09:03:47 +0200 | [diff] [blame] | 28 | #include <crypto/internal/aead.h> |
| 29 | #include <crypto/internal/skcipher.h> |
| 30 | |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 31 | #include "internal.h" |
| 32 | |
Mathias Krause | 8fd61d3 | 2013-02-05 18:19:15 +0100 | [diff] [blame] | 33 | #define null_terminated(x) (strnlen(x, sizeof(x)) < sizeof(x)) |
| 34 | |
Jussi Kivilinna | 66ce0b0 | 2012-08-28 16:46:54 +0300 | [diff] [blame] | 35 | static DEFINE_MUTEX(crypto_cfg_mutex); |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 36 | |
| 37 | /* The crypto netlink socket */ |
| 38 | static struct sock *crypto_nlsk; |
| 39 | |
| 40 | struct crypto_dump_info { |
| 41 | struct sk_buff *in_skb; |
| 42 | struct sk_buff *out_skb; |
| 43 | u32 nlmsg_seq; |
| 44 | u16 nlmsg_flags; |
| 45 | }; |
| 46 | |
| 47 | static struct crypto_alg *crypto_alg_match(struct crypto_user_alg *p, int exact) |
| 48 | { |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 49 | struct crypto_alg *q, *alg = NULL; |
| 50 | |
| 51 | down_read(&crypto_alg_sem); |
| 52 | |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 53 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
Herbert Xu | e6ea64e | 2011-10-21 14:37:10 +0200 | [diff] [blame] | 54 | int match = 0; |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 55 | |
| 56 | if ((q->cra_flags ^ p->cru_type) & p->cru_mask) |
| 57 | continue; |
| 58 | |
| 59 | if (strlen(p->cru_driver_name)) |
| 60 | match = !strcmp(q->cra_driver_name, |
| 61 | p->cru_driver_name); |
| 62 | else if (!exact) |
| 63 | match = !strcmp(q->cra_name, p->cru_name); |
| 64 | |
| 65 | if (match) { |
| 66 | alg = q; |
| 67 | break; |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | up_read(&crypto_alg_sem); |
| 72 | |
| 73 | return alg; |
| 74 | } |
| 75 | |
Steffen Klassert | 07a5fa4 | 2011-09-27 07:48:01 +0200 | [diff] [blame] | 76 | static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg) |
| 77 | { |
| 78 | struct crypto_report_cipher rcipher; |
| 79 | |
Mathias Krause | 9a5467b | 2013-02-05 18:19:13 +0100 | [diff] [blame] | 80 | strncpy(rcipher.type, "cipher", sizeof(rcipher.type)); |
Steffen Klassert | 07a5fa4 | 2011-09-27 07:48:01 +0200 | [diff] [blame] | 81 | |
| 82 | rcipher.blocksize = alg->cra_blocksize; |
| 83 | rcipher.min_keysize = alg->cra_cipher.cia_min_keysize; |
| 84 | rcipher.max_keysize = alg->cra_cipher.cia_max_keysize; |
| 85 | |
David S. Miller | 6662df3 | 2012-04-01 20:19:05 -0400 | [diff] [blame] | 86 | if (nla_put(skb, CRYPTOCFGA_REPORT_CIPHER, |
| 87 | sizeof(struct crypto_report_cipher), &rcipher)) |
| 88 | goto nla_put_failure; |
Steffen Klassert | 07a5fa4 | 2011-09-27 07:48:01 +0200 | [diff] [blame] | 89 | return 0; |
| 90 | |
| 91 | nla_put_failure: |
| 92 | return -EMSGSIZE; |
| 93 | } |
| 94 | |
Steffen Klassert | 540b97c | 2011-09-27 07:48:48 +0200 | [diff] [blame] | 95 | static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg) |
| 96 | { |
| 97 | struct crypto_report_comp rcomp; |
| 98 | |
Mathias Krause | 9a5467b | 2013-02-05 18:19:13 +0100 | [diff] [blame] | 99 | strncpy(rcomp.type, "compression", sizeof(rcomp.type)); |
David S. Miller | 6662df3 | 2012-04-01 20:19:05 -0400 | [diff] [blame] | 100 | if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS, |
| 101 | sizeof(struct crypto_report_comp), &rcomp)) |
| 102 | goto nla_put_failure; |
Steffen Klassert | 540b97c | 2011-09-27 07:48:48 +0200 | [diff] [blame] | 103 | return 0; |
| 104 | |
| 105 | nla_put_failure: |
| 106 | return -EMSGSIZE; |
| 107 | } |
| 108 | |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 109 | static int crypto_report_one(struct crypto_alg *alg, |
| 110 | struct crypto_user_alg *ualg, struct sk_buff *skb) |
| 111 | { |
Mathias Krause | 9a5467b | 2013-02-05 18:19:13 +0100 | [diff] [blame] | 112 | strncpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name)); |
| 113 | strncpy(ualg->cru_driver_name, alg->cra_driver_name, |
| 114 | sizeof(ualg->cru_driver_name)); |
| 115 | strncpy(ualg->cru_module_name, module_name(alg->cra_module), |
| 116 | sizeof(ualg->cru_module_name)); |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 117 | |
Mathias Krause | 9a5467b | 2013-02-05 18:19:13 +0100 | [diff] [blame] | 118 | ualg->cru_type = 0; |
| 119 | ualg->cru_mask = 0; |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 120 | ualg->cru_flags = alg->cra_flags; |
| 121 | ualg->cru_refcnt = atomic_read(&alg->cra_refcnt); |
| 122 | |
David S. Miller | 6662df3 | 2012-04-01 20:19:05 -0400 | [diff] [blame] | 123 | if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority)) |
| 124 | goto nla_put_failure; |
Steffen Klassert | 6c5a86f5 | 2011-09-27 07:25:05 +0200 | [diff] [blame] | 125 | if (alg->cra_flags & CRYPTO_ALG_LARVAL) { |
| 126 | struct crypto_report_larval rl; |
| 127 | |
Mathias Krause | 9a5467b | 2013-02-05 18:19:13 +0100 | [diff] [blame] | 128 | strncpy(rl.type, "larval", sizeof(rl.type)); |
David S. Miller | 6662df3 | 2012-04-01 20:19:05 -0400 | [diff] [blame] | 129 | if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL, |
| 130 | sizeof(struct crypto_report_larval), &rl)) |
| 131 | goto nla_put_failure; |
Steffen Klassert | 6c5a86f5 | 2011-09-27 07:25:05 +0200 | [diff] [blame] | 132 | goto out; |
| 133 | } |
| 134 | |
Steffen Klassert | b6aa63c | 2011-09-27 07:24:29 +0200 | [diff] [blame] | 135 | if (alg->cra_type && alg->cra_type->report) { |
| 136 | if (alg->cra_type->report(skb, alg)) |
| 137 | goto nla_put_failure; |
Steffen Klassert | 07a5fa4 | 2011-09-27 07:48:01 +0200 | [diff] [blame] | 138 | |
| 139 | goto out; |
| 140 | } |
| 141 | |
| 142 | switch (alg->cra_flags & (CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_LARVAL)) { |
| 143 | case CRYPTO_ALG_TYPE_CIPHER: |
| 144 | if (crypto_report_cipher(skb, alg)) |
| 145 | goto nla_put_failure; |
| 146 | |
| 147 | break; |
Steffen Klassert | 540b97c | 2011-09-27 07:48:48 +0200 | [diff] [blame] | 148 | case CRYPTO_ALG_TYPE_COMPRESS: |
| 149 | if (crypto_report_comp(skb, alg)) |
| 150 | goto nla_put_failure; |
| 151 | |
| 152 | break; |
Steffen Klassert | b6aa63c | 2011-09-27 07:24:29 +0200 | [diff] [blame] | 153 | } |
| 154 | |
Steffen Klassert | 6c5a86f5 | 2011-09-27 07:25:05 +0200 | [diff] [blame] | 155 | out: |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 156 | return 0; |
| 157 | |
| 158 | nla_put_failure: |
| 159 | return -EMSGSIZE; |
| 160 | } |
| 161 | |
| 162 | static int crypto_report_alg(struct crypto_alg *alg, |
| 163 | struct crypto_dump_info *info) |
| 164 | { |
| 165 | struct sk_buff *in_skb = info->in_skb; |
| 166 | struct sk_buff *skb = info->out_skb; |
| 167 | struct nlmsghdr *nlh; |
| 168 | struct crypto_user_alg *ualg; |
| 169 | int err = 0; |
| 170 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 171 | nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, info->nlmsg_seq, |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 172 | CRYPTO_MSG_GETALG, sizeof(*ualg), info->nlmsg_flags); |
| 173 | if (!nlh) { |
| 174 | err = -EMSGSIZE; |
| 175 | goto out; |
| 176 | } |
| 177 | |
| 178 | ualg = nlmsg_data(nlh); |
| 179 | |
| 180 | err = crypto_report_one(alg, ualg, skb); |
| 181 | if (err) { |
| 182 | nlmsg_cancel(skb, nlh); |
| 183 | goto out; |
| 184 | } |
| 185 | |
| 186 | nlmsg_end(skb, nlh); |
| 187 | |
| 188 | out: |
| 189 | return err; |
| 190 | } |
| 191 | |
| 192 | static int crypto_report(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, |
| 193 | struct nlattr **attrs) |
| 194 | { |
| 195 | struct crypto_user_alg *p = nlmsg_data(in_nlh); |
| 196 | struct crypto_alg *alg; |
| 197 | struct sk_buff *skb; |
| 198 | struct crypto_dump_info info; |
| 199 | int err; |
| 200 | |
Mathias Krause | 8fd61d3 | 2013-02-05 18:19:15 +0100 | [diff] [blame] | 201 | if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
| 202 | return -EINVAL; |
| 203 | |
Herbert Xu | 5d4a5e7 | 2014-11-20 12:44:32 +0800 | [diff] [blame^] | 204 | alg = crypto_alg_match(p, 0); |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 205 | if (!alg) |
| 206 | return -ENOENT; |
| 207 | |
| 208 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); |
| 209 | if (!skb) |
| 210 | return -ENOMEM; |
| 211 | |
| 212 | info.in_skb = in_skb; |
| 213 | info.out_skb = skb; |
| 214 | info.nlmsg_seq = in_nlh->nlmsg_seq; |
| 215 | info.nlmsg_flags = 0; |
| 216 | |
| 217 | err = crypto_report_alg(alg, &info); |
| 218 | if (err) |
| 219 | return err; |
| 220 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 221 | return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).portid); |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 222 | } |
| 223 | |
| 224 | static int crypto_dump_report(struct sk_buff *skb, struct netlink_callback *cb) |
| 225 | { |
| 226 | struct crypto_alg *alg; |
| 227 | struct crypto_dump_info info; |
| 228 | int err; |
| 229 | |
| 230 | if (cb->args[0]) |
| 231 | goto out; |
| 232 | |
| 233 | cb->args[0] = 1; |
| 234 | |
| 235 | info.in_skb = cb->skb; |
| 236 | info.out_skb = skb; |
| 237 | info.nlmsg_seq = cb->nlh->nlmsg_seq; |
| 238 | info.nlmsg_flags = NLM_F_MULTI; |
| 239 | |
| 240 | list_for_each_entry(alg, &crypto_alg_list, cra_list) { |
| 241 | err = crypto_report_alg(alg, &info); |
| 242 | if (err) |
| 243 | goto out_err; |
| 244 | } |
| 245 | |
| 246 | out: |
| 247 | return skb->len; |
| 248 | out_err: |
| 249 | return err; |
| 250 | } |
| 251 | |
| 252 | static int crypto_dump_report_done(struct netlink_callback *cb) |
| 253 | { |
| 254 | return 0; |
| 255 | } |
| 256 | |
| 257 | static int crypto_update_alg(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 258 | struct nlattr **attrs) |
| 259 | { |
| 260 | struct crypto_alg *alg; |
| 261 | struct crypto_user_alg *p = nlmsg_data(nlh); |
| 262 | struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL]; |
| 263 | LIST_HEAD(list); |
| 264 | |
Linus Torvalds | 639b4ac | 2014-06-07 19:44:40 -0700 | [diff] [blame] | 265 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
Matthias-Christian Ott | c568398 | 2014-05-08 21:58:12 +0800 | [diff] [blame] | 266 | return -EPERM; |
| 267 | |
Mathias Krause | 8fd61d3 | 2013-02-05 18:19:15 +0100 | [diff] [blame] | 268 | if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
| 269 | return -EINVAL; |
| 270 | |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 271 | if (priority && !strlen(p->cru_driver_name)) |
| 272 | return -EINVAL; |
| 273 | |
| 274 | alg = crypto_alg_match(p, 1); |
| 275 | if (!alg) |
| 276 | return -ENOENT; |
| 277 | |
| 278 | down_write(&crypto_alg_sem); |
| 279 | |
| 280 | crypto_remove_spawns(alg, &list, NULL); |
| 281 | |
| 282 | if (priority) |
| 283 | alg->cra_priority = nla_get_u32(priority); |
| 284 | |
| 285 | up_write(&crypto_alg_sem); |
| 286 | |
| 287 | crypto_remove_final(&list); |
| 288 | |
| 289 | return 0; |
| 290 | } |
| 291 | |
| 292 | static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 293 | struct nlattr **attrs) |
| 294 | { |
| 295 | struct crypto_alg *alg; |
| 296 | struct crypto_user_alg *p = nlmsg_data(nlh); |
| 297 | |
Linus Torvalds | 639b4ac | 2014-06-07 19:44:40 -0700 | [diff] [blame] | 298 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
Matthias-Christian Ott | c568398 | 2014-05-08 21:58:12 +0800 | [diff] [blame] | 299 | return -EPERM; |
| 300 | |
Mathias Krause | 8fd61d3 | 2013-02-05 18:19:15 +0100 | [diff] [blame] | 301 | if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
| 302 | return -EINVAL; |
| 303 | |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 304 | alg = crypto_alg_match(p, 1); |
| 305 | if (!alg) |
| 306 | return -ENOENT; |
| 307 | |
| 308 | /* We can not unregister core algorithms such as aes-generic. |
| 309 | * We would loose the reference in the crypto_alg_list to this algorithm |
| 310 | * if we try to unregister. Unregistering such an algorithm without |
| 311 | * removing the module is not possible, so we restrict to crypto |
| 312 | * instances that are build from templates. */ |
| 313 | if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE)) |
| 314 | return -EINVAL; |
| 315 | |
| 316 | if (atomic_read(&alg->cra_refcnt) != 1) |
| 317 | return -EBUSY; |
| 318 | |
Steffen Klassert | ce3fd84 | 2011-11-08 10:09:17 +0100 | [diff] [blame] | 319 | return crypto_unregister_instance(alg); |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 320 | } |
| 321 | |
Steffen Klassert | 1e12299 | 2012-03-29 09:03:47 +0200 | [diff] [blame] | 322 | static struct crypto_alg *crypto_user_skcipher_alg(const char *name, u32 type, |
| 323 | u32 mask) |
| 324 | { |
| 325 | int err; |
| 326 | struct crypto_alg *alg; |
| 327 | |
| 328 | type = crypto_skcipher_type(type); |
| 329 | mask = crypto_skcipher_mask(mask); |
| 330 | |
| 331 | for (;;) { |
| 332 | alg = crypto_lookup_skcipher(name, type, mask); |
| 333 | if (!IS_ERR(alg)) |
| 334 | return alg; |
| 335 | |
| 336 | err = PTR_ERR(alg); |
| 337 | if (err != -EAGAIN) |
| 338 | break; |
| 339 | if (signal_pending(current)) { |
| 340 | err = -EINTR; |
| 341 | break; |
| 342 | } |
| 343 | } |
| 344 | |
| 345 | return ERR_PTR(err); |
| 346 | } |
| 347 | |
| 348 | static struct crypto_alg *crypto_user_aead_alg(const char *name, u32 type, |
| 349 | u32 mask) |
| 350 | { |
| 351 | int err; |
| 352 | struct crypto_alg *alg; |
| 353 | |
| 354 | type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV); |
| 355 | type |= CRYPTO_ALG_TYPE_AEAD; |
| 356 | mask &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV); |
| 357 | mask |= CRYPTO_ALG_TYPE_MASK; |
| 358 | |
| 359 | for (;;) { |
| 360 | alg = crypto_lookup_aead(name, type, mask); |
| 361 | if (!IS_ERR(alg)) |
| 362 | return alg; |
| 363 | |
| 364 | err = PTR_ERR(alg); |
| 365 | if (err != -EAGAIN) |
| 366 | break; |
| 367 | if (signal_pending(current)) { |
| 368 | err = -EINTR; |
| 369 | break; |
| 370 | } |
| 371 | } |
| 372 | |
| 373 | return ERR_PTR(err); |
| 374 | } |
| 375 | |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 376 | static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 377 | struct nlattr **attrs) |
| 378 | { |
Jesper Juhl | 0cfdec7 | 2012-01-29 23:39:22 +0100 | [diff] [blame] | 379 | int exact = 0; |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 380 | const char *name; |
| 381 | struct crypto_alg *alg; |
| 382 | struct crypto_user_alg *p = nlmsg_data(nlh); |
| 383 | struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL]; |
| 384 | |
Linus Torvalds | 639b4ac | 2014-06-07 19:44:40 -0700 | [diff] [blame] | 385 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
Matthias-Christian Ott | c568398 | 2014-05-08 21:58:12 +0800 | [diff] [blame] | 386 | return -EPERM; |
| 387 | |
Mathias Krause | 8fd61d3 | 2013-02-05 18:19:15 +0100 | [diff] [blame] | 388 | if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name)) |
| 389 | return -EINVAL; |
| 390 | |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 391 | if (strlen(p->cru_driver_name)) |
| 392 | exact = 1; |
| 393 | |
| 394 | if (priority && !exact) |
| 395 | return -EINVAL; |
| 396 | |
| 397 | alg = crypto_alg_match(p, exact); |
| 398 | if (alg) |
| 399 | return -EEXIST; |
| 400 | |
| 401 | if (strlen(p->cru_driver_name)) |
| 402 | name = p->cru_driver_name; |
| 403 | else |
| 404 | name = p->cru_name; |
| 405 | |
Steffen Klassert | 1e12299 | 2012-03-29 09:03:47 +0200 | [diff] [blame] | 406 | switch (p->cru_type & p->cru_mask & CRYPTO_ALG_TYPE_MASK) { |
| 407 | case CRYPTO_ALG_TYPE_AEAD: |
| 408 | alg = crypto_user_aead_alg(name, p->cru_type, p->cru_mask); |
| 409 | break; |
| 410 | case CRYPTO_ALG_TYPE_GIVCIPHER: |
| 411 | case CRYPTO_ALG_TYPE_BLKCIPHER: |
| 412 | case CRYPTO_ALG_TYPE_ABLKCIPHER: |
| 413 | alg = crypto_user_skcipher_alg(name, p->cru_type, p->cru_mask); |
| 414 | break; |
| 415 | default: |
| 416 | alg = crypto_alg_mod_lookup(name, p->cru_type, p->cru_mask); |
| 417 | } |
| 418 | |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 419 | if (IS_ERR(alg)) |
| 420 | return PTR_ERR(alg); |
| 421 | |
| 422 | down_write(&crypto_alg_sem); |
| 423 | |
| 424 | if (priority) |
| 425 | alg->cra_priority = nla_get_u32(priority); |
| 426 | |
| 427 | up_write(&crypto_alg_sem); |
| 428 | |
| 429 | crypto_mod_put(alg); |
| 430 | |
| 431 | return 0; |
| 432 | } |
| 433 | |
| 434 | #define MSGSIZE(type) sizeof(struct type) |
| 435 | |
| 436 | static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = { |
| 437 | [CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), |
| 438 | [CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), |
| 439 | [CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), |
| 440 | [CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg), |
| 441 | }; |
| 442 | |
| 443 | static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = { |
| 444 | [CRYPTOCFGA_PRIORITY_VAL] = { .type = NLA_U32}, |
| 445 | }; |
| 446 | |
| 447 | #undef MSGSIZE |
| 448 | |
Mathias Krause | a84fb79 | 2013-02-24 14:09:12 +0100 | [diff] [blame] | 449 | static const struct crypto_link { |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 450 | int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **); |
| 451 | int (*dump)(struct sk_buff *, struct netlink_callback *); |
| 452 | int (*done)(struct netlink_callback *); |
| 453 | } crypto_dispatch[CRYPTO_NR_MSGTYPES] = { |
| 454 | [CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = { .doit = crypto_add_alg}, |
| 455 | [CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = { .doit = crypto_del_alg}, |
| 456 | [CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = { .doit = crypto_update_alg}, |
| 457 | [CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report, |
| 458 | .dump = crypto_dump_report, |
| 459 | .done = crypto_dump_report_done}, |
| 460 | }; |
| 461 | |
| 462 | static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
| 463 | { |
| 464 | struct nlattr *attrs[CRYPTOCFGA_MAX+1]; |
Mathias Krause | a84fb79 | 2013-02-24 14:09:12 +0100 | [diff] [blame] | 465 | const struct crypto_link *link; |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 466 | int type, err; |
| 467 | |
| 468 | type = nlh->nlmsg_type; |
| 469 | if (type > CRYPTO_MSG_MAX) |
| 470 | return -EINVAL; |
| 471 | |
| 472 | type -= CRYPTO_MSG_BASE; |
| 473 | link = &crypto_dispatch[type]; |
| 474 | |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 475 | if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) && |
| 476 | (nlh->nlmsg_flags & NLM_F_DUMP))) { |
Steffen Klassert | 5219a53 | 2012-03-29 09:04:46 +0200 | [diff] [blame] | 477 | struct crypto_alg *alg; |
| 478 | u16 dump_alloc = 0; |
| 479 | |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 480 | if (link->dump == NULL) |
| 481 | return -EINVAL; |
Steffen Klassert | 5219a53 | 2012-03-29 09:04:46 +0200 | [diff] [blame] | 482 | |
| 483 | list_for_each_entry(alg, &crypto_alg_list, cra_list) |
| 484 | dump_alloc += CRYPTO_REPORT_MAXSIZE; |
| 485 | |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 486 | { |
| 487 | struct netlink_dump_control c = { |
| 488 | .dump = link->dump, |
| 489 | .done = link->done, |
Steffen Klassert | 5219a53 | 2012-03-29 09:04:46 +0200 | [diff] [blame] | 490 | .min_dump_alloc = dump_alloc, |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 491 | }; |
| 492 | return netlink_dump_start(crypto_nlsk, skb, nlh, &c); |
| 493 | } |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 494 | } |
| 495 | |
| 496 | err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX, |
| 497 | crypto_policy); |
| 498 | if (err < 0) |
| 499 | return err; |
| 500 | |
| 501 | if (link->doit == NULL) |
| 502 | return -EINVAL; |
| 503 | |
| 504 | return link->doit(skb, nlh, attrs); |
| 505 | } |
| 506 | |
| 507 | static void crypto_netlink_rcv(struct sk_buff *skb) |
| 508 | { |
| 509 | mutex_lock(&crypto_cfg_mutex); |
| 510 | netlink_rcv_skb(skb, &crypto_user_rcv_msg); |
| 511 | mutex_unlock(&crypto_cfg_mutex); |
| 512 | } |
| 513 | |
| 514 | static int __init crypto_user_init(void) |
| 515 | { |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 516 | struct netlink_kernel_cfg cfg = { |
| 517 | .input = crypto_netlink_rcv, |
| 518 | }; |
| 519 | |
Pablo Neira Ayuso | 9f00d97 | 2012-09-08 02:53:54 +0000 | [diff] [blame] | 520 | crypto_nlsk = netlink_kernel_create(&init_net, NETLINK_CRYPTO, &cfg); |
Steffen Klassert | a38f790 | 2011-09-27 07:23:50 +0200 | [diff] [blame] | 521 | if (!crypto_nlsk) |
| 522 | return -ENOMEM; |
| 523 | |
| 524 | return 0; |
| 525 | } |
| 526 | |
| 527 | static void __exit crypto_user_exit(void) |
| 528 | { |
| 529 | netlink_kernel_release(crypto_nlsk); |
| 530 | } |
| 531 | |
| 532 | module_init(crypto_user_init); |
| 533 | module_exit(crypto_user_exit); |
| 534 | MODULE_LICENSE("GPL"); |
| 535 | MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); |
| 536 | MODULE_DESCRIPTION("Crypto userspace configuration API"); |