2 * Modifications for Lustre
4 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
6 * Author: Eric Mei <ericm@clusterfs.com>
10 * linux/net/sunrpc/gss_krb5_mech.c
11 * linux/net/sunrpc/gss_krb5_crypto.c
12 * linux/net/sunrpc/gss_krb5_seal.c
13 * linux/net/sunrpc/gss_krb5_seqnum.c
14 * linux/net/sunrpc/gss_krb5_unseal.c
16 * Copyright (c) 2001 The Regents of the University of Michigan.
17 * All rights reserved.
19 * Andy Adamson <andros@umich.edu>
20 * J. Bruce Fields <bfields@umich.edu>
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the above copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. Neither the name of the University nor the names of its
32 * contributors may be used to endorse or promote products derived
33 * from this software without specific prior written permission.
35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
37 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
39 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
40 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
41 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
42 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
43 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
44 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
45 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
49 #define DEBUG_SUBSYSTEM S_SEC
52 #include <obd_support.h>
54 #include "gss_internal.h"
55 #include "gss_crypto.h"
57 int gss_keyblock_init(struct gss_keyblock *kb, const char *alg_name,
62 kb->kb_tfm = crypto_alloc_sync_skcipher(alg_name, alg_mode, 0);
63 if (IS_ERR(kb->kb_tfm)) {
64 rc = PTR_ERR(kb->kb_tfm);
66 CERROR("failed to alloc tfm: %s, mode %d: rc = %d\n", alg_name,
71 rc = crypto_sync_skcipher_setkey(kb->kb_tfm, kb->kb_key.data,
74 CERROR("failed to set %s key, len %d, rc = %d\n", alg_name,
82 void gss_keyblock_free(struct gss_keyblock *kb)
84 rawobj_free(&kb->kb_key);
86 crypto_free_sync_skcipher(kb->kb_tfm);
89 int gss_keyblock_dup(struct gss_keyblock *new, struct gss_keyblock *kb)
91 return rawobj_dup(&new->kb_key, &kb->kb_key);
94 int gss_get_bytes(char **ptr, const char *end, void *res, size_t len)
106 int gss_get_rawobj(char **ptr, const char *end, rawobj_t *res)
112 if (gss_get_bytes(&p, end, &len, sizeof(len)))
116 if (q > end || q < p)
119 /* Support empty objects */
121 OBD_ALLOC_LARGE(res->data, len);
131 memcpy(res->data, p, len);
136 int gss_get_keyblock(char **ptr, const char *end,
137 struct gss_keyblock *kb, __u32 keysize)
142 OBD_ALLOC_LARGE(buf, keysize);
146 rc = gss_get_bytes(ptr, end, buf, keysize);
148 OBD_FREE_LARGE(buf, keysize);
152 kb->kb_key.len = keysize;
153 kb->kb_key.data = buf;
158 * Should be used for buffers allocated with k/vmalloc().
160 * Dispose of @sgt with gss_teardown_sgtable().
162 * @prealloc_sg is to avoid memory allocation inside sg_alloc_table()
163 * in cases where a single sg is sufficient. No attempt to reduce the
164 * number of sgs by squeezing physically contiguous pages together is
165 * made though, for simplicity.
167 * This function is copied from the ceph filesystem code.
169 int gss_setup_sgtable(struct sg_table *sgt, struct scatterlist *prealloc_sg,
170 const void *buf, unsigned int buf_len)
172 struct scatterlist *sg;
173 const bool is_vmalloc = is_vmalloc_addr(buf);
174 unsigned int off = offset_in_page(buf);
175 unsigned int chunk_cnt = 1;
176 unsigned int chunk_len = PAGE_ALIGN(off + buf_len);
181 memset(sgt, 0, sizeof(*sgt));
186 chunk_cnt = chunk_len >> PAGE_SHIFT;
187 chunk_len = PAGE_SIZE;
191 rc = sg_alloc_table(sgt, chunk_cnt, GFP_NOFS);
195 WARN_ON_ONCE(chunk_cnt != 1);
196 sg_init_table(prealloc_sg, 1);
197 sgt->sgl = prealloc_sg;
198 sgt->nents = sgt->orig_nents = 1;
201 for_each_sg(sgt->sgl, sg, sgt->orig_nents, i) {
203 unsigned int len = min(chunk_len - off, buf_len);
206 page = vmalloc_to_page(buf);
208 page = virt_to_page(buf);
210 sg_set_page(sg, page, len, off);
217 WARN_ON_ONCE(buf_len != 0);
222 void gss_teardown_sgtable(struct sg_table *sgt)
224 if (sgt->orig_nents > 1)
228 int gss_crypt_generic(struct crypto_sync_skcipher *tfm, int decrypt,
229 const void *iv, const void *in, void *out, size_t length)
231 struct scatterlist sg;
232 struct sg_table sg_out;
233 __u8 local_iv[16] = {0};
235 SYNC_SKCIPHER_REQUEST_ON_STACK(req, tfm);
239 if (length % crypto_sync_skcipher_blocksize(tfm) != 0) {
240 CERROR("output length %zu mismatch blocksize %d\n",
241 length, crypto_sync_skcipher_blocksize(tfm));
245 if (crypto_sync_skcipher_ivsize(tfm) > ARRAY_SIZE(local_iv)) {
246 CERROR("iv size too large %d\n",
247 crypto_sync_skcipher_ivsize(tfm));
252 memcpy(local_iv, iv, crypto_sync_skcipher_ivsize(tfm));
255 memmove(out, in, length);
257 ret = gss_setup_sgtable(&sg_out, &sg, out, length);
261 skcipher_request_set_sync_tfm(req, tfm);
262 skcipher_request_set_callback(req, 0, NULL, NULL);
263 skcipher_request_set_crypt(req, &sg, &sg, length, local_iv);
266 ret = crypto_skcipher_decrypt_iv(req, &sg, &sg, length);
268 ret = crypto_skcipher_encrypt_iv(req, &sg, &sg, length);
270 skcipher_request_zero(req);
271 gss_teardown_sgtable(&sg_out);
276 int gss_digest_hash(struct ahash_request *req,
277 rawobj_t *hdr, int msgcnt, rawobj_t *msgs,
278 int iovcnt, struct bio_vec *iovs)
280 struct scatterlist sg[1];
285 for (i = 0; i < msgcnt; i++) {
286 if (msgs[i].len == 0)
289 rc = gss_setup_sgtable(&sgt, sg, msgs[i].data, msgs[i].len);
293 ahash_request_set_crypt(req, sg, NULL, msgs[i].len);
294 rc = crypto_ahash_update(req);
295 gss_teardown_sgtable(&sgt);
300 for (i = 0; i < iovcnt; i++) {
301 if (iovs[i].bv_len == 0)
304 sg_init_table(sg, 1);
305 sg_set_page(&sg[0], iovs[i].bv_page, iovs[i].bv_len,
308 ahash_request_set_crypt(req, sg, NULL, iovs[i].bv_len);
309 rc = crypto_ahash_update(req);
315 rc = gss_setup_sgtable(&sgt, sg, hdr->data, hdr->len);
319 ahash_request_set_crypt(req, sg, NULL, hdr->len);
320 rc = crypto_ahash_update(req);
321 gss_teardown_sgtable(&sgt);
329 int gss_digest_hash_compat(struct ahash_request *req,
330 rawobj_t *hdr, int msgcnt, rawobj_t *msgs,
331 int iovcnt, struct bio_vec *iovs)
333 struct scatterlist sg[1];
338 for (i = 0; i < msgcnt; i++) {
339 if (msgs[i].len == 0)
342 rc = gss_setup_sgtable(&sgt, sg, msgs[i].data, msgs[i].len);
346 ahash_request_set_crypt(req, sg, NULL, msgs[i].len);
347 rc = crypto_ahash_update(req);
348 gss_teardown_sgtable(&sgt);
353 for (i = 0; i < iovcnt; i++) {
354 if (iovs[i].bv_len == 0)
357 sg_init_table(sg, 1);
358 sg_set_page(&sg[0], iovs[i].bv_page, iovs[i].bv_len,
361 ahash_request_set_crypt(req, sg, NULL, iovs[i].bv_len);
362 rc = crypto_ahash_update(req);
368 rc = gss_setup_sgtable(&sgt, sg, &(hdr->len), sizeof(hdr->len));
372 ahash_request_set_crypt(req, sg, NULL, sizeof(hdr->len));
373 rc = crypto_ahash_update(req);
374 gss_teardown_sgtable(&sgt);
382 int gss_add_padding(rawobj_t *msg, int msg_buflen, int blocksize)
386 padding = (blocksize - (msg->len & (blocksize - 1))) &
391 if (msg->len + padding > msg_buflen) {
392 CERROR("bufsize %u too small: datalen %u, padding %u\n",
393 msg_buflen, msg->len, padding);
397 memset(msg->data + msg->len, padding, padding);
402 int gss_crypt_rawobjs(struct crypto_sync_skcipher *tfm, __u8 *iv,
403 int inobj_cnt, rawobj_t *inobjs, rawobj_t *outobj,
406 struct scatterlist src;
407 struct scatterlist dst;
408 struct sg_table sg_dst;
409 struct sg_table sg_src;
413 SYNC_SKCIPHER_REQUEST_ON_STACK(req, tfm);
418 skcipher_request_set_sync_tfm(req, tfm);
419 skcipher_request_set_callback(req, 0, NULL, NULL);
421 for (i = 0; i < inobj_cnt; i++) {
422 LASSERT(buf + inobjs[i].len <= outobj->data + outobj->len);
424 rc = gss_setup_sgtable(&sg_src, &src, inobjs[i].data,
429 rc = gss_setup_sgtable(&sg_dst, &dst, buf,
430 outobj->len - datalen);
432 gss_teardown_sgtable(&sg_src);
436 skcipher_request_set_crypt(req, &src, &dst, src.length, iv);
438 skcipher_request_set_crypt_iv(req);
441 rc = crypto_skcipher_encrypt_iv(req, &dst, &src,
444 rc = crypto_skcipher_decrypt_iv(req, &dst, &src,
447 gss_teardown_sgtable(&sg_src);
448 gss_teardown_sgtable(&sg_dst);
451 CERROR("encrypt error %d\n", rc);
452 skcipher_request_zero(req);
456 datalen += inobjs[i].len;
457 buf += inobjs[i].len;
459 skcipher_request_zero(req);
461 outobj->len = datalen;