Herbert Xu | fe869cd | 2010-10-19 21:23:00 +0800 | [diff] [blame] | 1 | /* |
| 2 | * algif_hash: User-space interface for hash algorithms |
| 3 | * |
| 4 | * This file provides the user-space API for hash algorithms. |
| 5 | * |
| 6 | * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms of the GNU General Public License as published by the Free |
| 10 | * Software Foundation; either version 2 of the License, or (at your option) |
| 11 | * any later version. |
| 12 | * |
| 13 | */ |
| 14 | |
| 15 | #include <crypto/hash.h> |
| 16 | #include <crypto/if_alg.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/mm.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/net.h> |
| 22 | #include <net/sock.h> |
| 23 | |
| 24 | struct hash_ctx { |
| 25 | struct af_alg_sgl sgl; |
| 26 | |
| 27 | u8 *result; |
| 28 | |
| 29 | struct af_alg_completion completion; |
| 30 | |
| 31 | unsigned int len; |
| 32 | bool more; |
| 33 | |
| 34 | struct ahash_request req; |
| 35 | }; |
| 36 | |
| 37 | static int hash_sendmsg(struct kiocb *unused, struct socket *sock, |
| 38 | struct msghdr *msg, size_t ignored) |
| 39 | { |
| 40 | int limit = ALG_MAX_PAGES * PAGE_SIZE; |
| 41 | struct sock *sk = sock->sk; |
| 42 | struct alg_sock *ask = alg_sk(sk); |
| 43 | struct hash_ctx *ctx = ask->private; |
| 44 | unsigned long iovlen; |
| 45 | struct iovec *iov; |
| 46 | long copied = 0; |
| 47 | int err; |
| 48 | |
| 49 | if (limit > sk->sk_sndbuf) |
| 50 | limit = sk->sk_sndbuf; |
| 51 | |
| 52 | lock_sock(sk); |
| 53 | if (!ctx->more) { |
| 54 | err = crypto_ahash_init(&ctx->req); |
| 55 | if (err) |
| 56 | goto unlock; |
| 57 | } |
| 58 | |
| 59 | ctx->more = 0; |
| 60 | |
| 61 | for (iov = msg->msg_iov, iovlen = msg->msg_iovlen; iovlen > 0; |
| 62 | iovlen--, iov++) { |
| 63 | unsigned long seglen = iov->iov_len; |
| 64 | char __user *from = iov->iov_base; |
| 65 | |
| 66 | while (seglen) { |
| 67 | int len = min_t(unsigned long, seglen, limit); |
| 68 | int newlen; |
| 69 | |
| 70 | newlen = af_alg_make_sg(&ctx->sgl, from, len, 0); |
Herbert Xu | 269230e | 2011-06-27 15:45:19 +0800 | [diff] [blame] | 71 | if (newlen < 0) { |
| 72 | err = copied ? 0 : newlen; |
Herbert Xu | fe869cd | 2010-10-19 21:23:00 +0800 | [diff] [blame] | 73 | goto unlock; |
Herbert Xu | 269230e | 2011-06-27 15:45:19 +0800 | [diff] [blame] | 74 | } |
Herbert Xu | fe869cd | 2010-10-19 21:23:00 +0800 | [diff] [blame] | 75 | |
| 76 | ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, |
| 77 | newlen); |
| 78 | |
| 79 | err = af_alg_wait_for_completion( |
| 80 | crypto_ahash_update(&ctx->req), |
| 81 | &ctx->completion); |
| 82 | |
| 83 | af_alg_free_sg(&ctx->sgl); |
| 84 | |
| 85 | if (err) |
| 86 | goto unlock; |
| 87 | |
| 88 | seglen -= newlen; |
| 89 | from += newlen; |
| 90 | copied += newlen; |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | err = 0; |
| 95 | |
| 96 | ctx->more = msg->msg_flags & MSG_MORE; |
| 97 | if (!ctx->more) { |
| 98 | ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0); |
| 99 | err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req), |
| 100 | &ctx->completion); |
| 101 | } |
| 102 | |
| 103 | unlock: |
| 104 | release_sock(sk); |
| 105 | |
| 106 | return err ?: copied; |
| 107 | } |
| 108 | |
| 109 | static ssize_t hash_sendpage(struct socket *sock, struct page *page, |
| 110 | int offset, size_t size, int flags) |
| 111 | { |
| 112 | struct sock *sk = sock->sk; |
| 113 | struct alg_sock *ask = alg_sk(sk); |
| 114 | struct hash_ctx *ctx = ask->private; |
| 115 | int err; |
| 116 | |
Shawn Landden | 1f0bd0c | 2013-11-24 22:36:28 -0800 | [diff] [blame] | 117 | if (flags & MSG_SENDPAGE_NOTLAST) |
| 118 | flags |= MSG_MORE; |
| 119 | |
Herbert Xu | fe869cd | 2010-10-19 21:23:00 +0800 | [diff] [blame] | 120 | lock_sock(sk); |
| 121 | sg_init_table(ctx->sgl.sg, 1); |
| 122 | sg_set_page(ctx->sgl.sg, page, size, offset); |
| 123 | |
| 124 | ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size); |
| 125 | |
| 126 | if (!(flags & MSG_MORE)) { |
| 127 | if (ctx->more) |
| 128 | err = crypto_ahash_finup(&ctx->req); |
| 129 | else |
| 130 | err = crypto_ahash_digest(&ctx->req); |
| 131 | } else { |
| 132 | if (!ctx->more) { |
| 133 | err = crypto_ahash_init(&ctx->req); |
| 134 | if (err) |
| 135 | goto unlock; |
| 136 | } |
| 137 | |
| 138 | err = crypto_ahash_update(&ctx->req); |
| 139 | } |
| 140 | |
| 141 | err = af_alg_wait_for_completion(err, &ctx->completion); |
| 142 | if (err) |
| 143 | goto unlock; |
| 144 | |
| 145 | ctx->more = flags & MSG_MORE; |
| 146 | |
| 147 | unlock: |
| 148 | release_sock(sk); |
| 149 | |
| 150 | return err ?: size; |
| 151 | } |
| 152 | |
| 153 | static int hash_recvmsg(struct kiocb *unused, struct socket *sock, |
| 154 | struct msghdr *msg, size_t len, int flags) |
| 155 | { |
| 156 | struct sock *sk = sock->sk; |
| 157 | struct alg_sock *ask = alg_sk(sk); |
| 158 | struct hash_ctx *ctx = ask->private; |
| 159 | unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)); |
| 160 | int err; |
| 161 | |
| 162 | if (len > ds) |
| 163 | len = ds; |
| 164 | else if (len < ds) |
| 165 | msg->msg_flags |= MSG_TRUNC; |
| 166 | |
Herbert Xu | fe869cd | 2010-10-19 21:23:00 +0800 | [diff] [blame] | 167 | lock_sock(sk); |
| 168 | if (ctx->more) { |
| 169 | ctx->more = 0; |
| 170 | ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0); |
| 171 | err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req), |
| 172 | &ctx->completion); |
| 173 | if (err) |
| 174 | goto unlock; |
| 175 | } |
| 176 | |
| 177 | err = memcpy_toiovec(msg->msg_iov, ctx->result, len); |
| 178 | |
| 179 | unlock: |
| 180 | release_sock(sk); |
| 181 | |
| 182 | return err ?: len; |
| 183 | } |
| 184 | |
| 185 | static int hash_accept(struct socket *sock, struct socket *newsock, int flags) |
| 186 | { |
| 187 | struct sock *sk = sock->sk; |
| 188 | struct alg_sock *ask = alg_sk(sk); |
| 189 | struct hash_ctx *ctx = ask->private; |
| 190 | struct ahash_request *req = &ctx->req; |
| 191 | char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req))]; |
| 192 | struct sock *sk2; |
| 193 | struct alg_sock *ask2; |
| 194 | struct hash_ctx *ctx2; |
Herbert Xu | a092933 | 2015-11-01 17:11:19 +0800 | [diff] [blame] | 195 | bool more; |
Herbert Xu | fe869cd | 2010-10-19 21:23:00 +0800 | [diff] [blame] | 196 | int err; |
| 197 | |
Herbert Xu | a092933 | 2015-11-01 17:11:19 +0800 | [diff] [blame] | 198 | lock_sock(sk); |
| 199 | more = ctx->more; |
| 200 | err = more ? crypto_ahash_export(req, state) : 0; |
| 201 | release_sock(sk); |
| 202 | |
Herbert Xu | fe869cd | 2010-10-19 21:23:00 +0800 | [diff] [blame] | 203 | if (err) |
| 204 | return err; |
| 205 | |
| 206 | err = af_alg_accept(ask->parent, newsock); |
| 207 | if (err) |
| 208 | return err; |
| 209 | |
| 210 | sk2 = newsock->sk; |
| 211 | ask2 = alg_sk(sk2); |
| 212 | ctx2 = ask2->private; |
Herbert Xu | a092933 | 2015-11-01 17:11:19 +0800 | [diff] [blame] | 213 | ctx2->more = more; |
| 214 | |
| 215 | if (!more) |
| 216 | return err; |
Herbert Xu | fe869cd | 2010-10-19 21:23:00 +0800 | [diff] [blame] | 217 | |
| 218 | err = crypto_ahash_import(&ctx2->req, state); |
| 219 | if (err) { |
| 220 | sock_orphan(sk2); |
| 221 | sock_put(sk2); |
| 222 | } |
| 223 | |
| 224 | return err; |
| 225 | } |
| 226 | |
| 227 | static struct proto_ops algif_hash_ops = { |
| 228 | .family = PF_ALG, |
| 229 | |
| 230 | .connect = sock_no_connect, |
| 231 | .socketpair = sock_no_socketpair, |
| 232 | .getname = sock_no_getname, |
| 233 | .ioctl = sock_no_ioctl, |
| 234 | .listen = sock_no_listen, |
| 235 | .shutdown = sock_no_shutdown, |
| 236 | .getsockopt = sock_no_getsockopt, |
| 237 | .mmap = sock_no_mmap, |
| 238 | .bind = sock_no_bind, |
| 239 | .setsockopt = sock_no_setsockopt, |
| 240 | .poll = sock_no_poll, |
| 241 | |
| 242 | .release = af_alg_release, |
| 243 | .sendmsg = hash_sendmsg, |
| 244 | .sendpage = hash_sendpage, |
| 245 | .recvmsg = hash_recvmsg, |
| 246 | .accept = hash_accept, |
| 247 | }; |
| 248 | |
| 249 | static void *hash_bind(const char *name, u32 type, u32 mask) |
| 250 | { |
| 251 | return crypto_alloc_ahash(name, type, mask); |
| 252 | } |
| 253 | |
| 254 | static void hash_release(void *private) |
| 255 | { |
| 256 | crypto_free_ahash(private); |
| 257 | } |
| 258 | |
| 259 | static int hash_setkey(void *private, const u8 *key, unsigned int keylen) |
| 260 | { |
| 261 | return crypto_ahash_setkey(private, key, keylen); |
| 262 | } |
| 263 | |
| 264 | static void hash_sock_destruct(struct sock *sk) |
| 265 | { |
| 266 | struct alg_sock *ask = alg_sk(sk); |
| 267 | struct hash_ctx *ctx = ask->private; |
| 268 | |
| 269 | sock_kfree_s(sk, ctx->result, |
| 270 | crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req))); |
| 271 | sock_kfree_s(sk, ctx, ctx->len); |
| 272 | af_alg_release_parent(sk); |
| 273 | } |
| 274 | |
| 275 | static int hash_accept_parent(void *private, struct sock *sk) |
| 276 | { |
| 277 | struct hash_ctx *ctx; |
| 278 | struct alg_sock *ask = alg_sk(sk); |
| 279 | unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(private); |
| 280 | unsigned ds = crypto_ahash_digestsize(private); |
| 281 | |
| 282 | ctx = sock_kmalloc(sk, len, GFP_KERNEL); |
| 283 | if (!ctx) |
| 284 | return -ENOMEM; |
| 285 | |
| 286 | ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL); |
| 287 | if (!ctx->result) { |
| 288 | sock_kfree_s(sk, ctx, len); |
| 289 | return -ENOMEM; |
| 290 | } |
| 291 | |
| 292 | memset(ctx->result, 0, ds); |
| 293 | |
| 294 | ctx->len = len; |
| 295 | ctx->more = 0; |
| 296 | af_alg_init_completion(&ctx->completion); |
| 297 | |
| 298 | ask->private = ctx; |
| 299 | |
| 300 | ahash_request_set_tfm(&ctx->req, private); |
| 301 | ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG, |
| 302 | af_alg_complete, &ctx->completion); |
| 303 | |
| 304 | sk->sk_destruct = hash_sock_destruct; |
| 305 | |
| 306 | return 0; |
| 307 | } |
| 308 | |
| 309 | static const struct af_alg_type algif_type_hash = { |
| 310 | .bind = hash_bind, |
| 311 | .release = hash_release, |
| 312 | .setkey = hash_setkey, |
| 313 | .accept = hash_accept_parent, |
| 314 | .ops = &algif_hash_ops, |
| 315 | .name = "hash", |
| 316 | .owner = THIS_MODULE |
| 317 | }; |
| 318 | |
| 319 | static int __init algif_hash_init(void) |
| 320 | { |
| 321 | return af_alg_register_type(&algif_type_hash); |
| 322 | } |
| 323 | |
| 324 | static void __exit algif_hash_exit(void) |
| 325 | { |
| 326 | int err = af_alg_unregister_type(&algif_type_hash); |
| 327 | BUG_ON(err); |
| 328 | } |
| 329 | |
| 330 | module_init(algif_hash_init); |
| 331 | module_exit(algif_hash_exit); |
| 332 | MODULE_LICENSE("GPL"); |