2 * linux/net/sunrpc/gss_krb5_crypto.c
4 * Copyright (c) 2000 The Regents of the University of Michigan.
7 * Andy Adamson <andros@umich.edu>
8 * Bruce Fields <bfields@umich.edu>
12 * Copyright (C) 1998 by the FundsXpress, INC.
14 * All rights reserved.
16 * Export of this software from the United States of America may require
17 * a specific license from the United States Government. It is the
18 * responsibility of any person or organization contemplating export to
19 * obtain such a license before exporting.
21 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
22 * distribute this software and its documentation for any purpose and
23 * without fee is hereby granted, provided that the above copyright
24 * notice appear in all copies and that both that copyright notice and
25 * this permission notice appear in supporting documentation, and that
26 * the name of FundsXpress. not be used in advertising or publicity pertaining
27 * to distribution of the software without specific, written prior
28 * permission. FundsXpress makes no representations about the suitability of
29 * this software for any purpose. It is provided "as is" without express
30 * or implied warranty.
32 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
33 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
34 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
37 #include <linux/err.h>
38 #include <linux/types.h>
40 #include <linux/scatterlist.h>
41 #include <linux/crypto.h>
42 #include <linux/highmem.h>
43 #include <linux/pagemap.h>
44 #include <linux/sunrpc/gss_krb5.h>
45 #include <linux/sunrpc/xdr.h>
48 # define RPCDBG_FACILITY RPCDBG_AUTH
53 struct crypto_blkcipher *tfm,
60 struct scatterlist sg[1];
61 u8 local_iv[16] = {0};
62 struct blkcipher_desc desc = { .tfm = tfm, .info = local_iv };
64 if (length % crypto_blkcipher_blocksize(tfm) != 0)
67 if (crypto_blkcipher_ivsize(tfm) > 16) {
68 dprintk("RPC: gss_k5encrypt: tfm iv size too large %d\n",
69 crypto_blkcipher_ivsize(tfm));
74 memcpy(local_iv, iv, crypto_blkcipher_ivsize(tfm));
76 memcpy(out, in, length);
77 sg_init_one(sg, out, length);
79 ret = crypto_blkcipher_encrypt_iv(&desc, sg, sg, length);
81 dprintk("RPC: krb5_encrypt returns %d\n", ret);
87 struct crypto_blkcipher *tfm,
94 struct scatterlist sg[1];
95 u8 local_iv[16] = {0};
96 struct blkcipher_desc desc = { .tfm = tfm, .info = local_iv };
98 if (length % crypto_blkcipher_blocksize(tfm) != 0)
101 if (crypto_blkcipher_ivsize(tfm) > 16) {
102 dprintk("RPC: gss_k5decrypt: tfm iv size too large %d\n",
103 crypto_blkcipher_ivsize(tfm));
107 memcpy(local_iv,iv, crypto_blkcipher_ivsize(tfm));
109 memcpy(out, in, length);
110 sg_init_one(sg, out, length);
112 ret = crypto_blkcipher_decrypt_iv(&desc, sg, sg, length);
114 dprintk("RPC: gss_k5decrypt returns %d\n",ret);
119 checksummer(struct scatterlist *sg, void *data)
121 struct hash_desc *desc = data;
123 return crypto_hash_update(desc, sg, sg->length);
126 /* checksum the plaintext data and hdrlen bytes of the token header */
128 make_checksum(char *cksumname, char *header, int hdrlen, struct xdr_buf *body,
129 int body_offset, struct xdr_netobj *cksum)
131 struct hash_desc desc; /* XXX add to ctx? */
132 struct scatterlist sg[1];
135 desc.tfm = crypto_alloc_hash(cksumname, 0, CRYPTO_ALG_ASYNC);
136 if (IS_ERR(desc.tfm))
137 return GSS_S_FAILURE;
138 cksum->len = crypto_hash_digestsize(desc.tfm);
139 desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
141 err = crypto_hash_init(&desc);
144 sg_init_one(sg, header, hdrlen);
145 err = crypto_hash_update(&desc, sg, hdrlen);
148 err = xdr_process_buf(body, body_offset, body->len - body_offset,
152 err = crypto_hash_final(&desc, cksum->data);
155 crypto_free_hash(desc.tfm);
156 return err ? GSS_S_FAILURE : 0;
159 struct encryptor_desc {
160 u8 iv[8]; /* XXX hard-coded blocksize */
161 struct blkcipher_desc desc;
163 struct xdr_buf *outbuf;
165 struct scatterlist infrags[4];
166 struct scatterlist outfrags[4];
172 encryptor(struct scatterlist *sg, void *data)
174 struct encryptor_desc *desc = data;
175 struct xdr_buf *outbuf = desc->outbuf;
176 struct page *in_page;
177 int thislen = desc->fraglen + sg->length;
181 /* Worst case is 4 fragments: head, end of page 1, start
182 * of page 2, tail. Anything more is a bug. */
183 BUG_ON(desc->fragno > 3);
185 page_pos = desc->pos - outbuf->head[0].iov_len;
186 if (page_pos >= 0 && page_pos < outbuf->page_len) {
187 /* pages are not in place: */
188 int i = (page_pos + outbuf->page_base) >> PAGE_CACHE_SHIFT;
189 in_page = desc->pages[i];
191 in_page = sg_page(sg);
193 sg_set_page(&desc->infrags[desc->fragno], in_page, sg->length,
195 sg_set_page(&desc->outfrags[desc->fragno], sg_page(sg), sg->length,
198 desc->fraglen += sg->length;
199 desc->pos += sg->length;
201 fraglen = thislen & 7; /* XXX hardcoded blocksize */
207 sg_mark_end(&desc->infrags[desc->fragno - 1]);
208 sg_mark_end(&desc->outfrags[desc->fragno - 1]);
210 ret = crypto_blkcipher_encrypt_iv(&desc->desc, desc->outfrags,
211 desc->infrags, thislen);
215 sg_init_table(desc->infrags, 4);
216 sg_init_table(desc->outfrags, 4);
219 sg_set_page(&desc->outfrags[0], sg_page(sg), fraglen,
220 sg->offset + sg->length - fraglen);
221 desc->infrags[0] = desc->outfrags[0];
222 sg_assign_page(&desc->infrags[0], in_page);
224 desc->fraglen = fraglen;
233 gss_encrypt_xdr_buf(struct crypto_blkcipher *tfm, struct xdr_buf *buf,
234 int offset, struct page **pages)
237 struct encryptor_desc desc;
239 BUG_ON((buf->len - offset) % crypto_blkcipher_blocksize(tfm) != 0);
241 memset(desc.iv, 0, sizeof(desc.iv));
243 desc.desc.info = desc.iv;
251 sg_init_table(desc.infrags, 4);
252 sg_init_table(desc.outfrags, 4);
254 ret = xdr_process_buf(buf, offset, buf->len - offset, encryptor, &desc);
258 struct decryptor_desc {
259 u8 iv[8]; /* XXX hard-coded blocksize */
260 struct blkcipher_desc desc;
261 struct scatterlist frags[4];
267 decryptor(struct scatterlist *sg, void *data)
269 struct decryptor_desc *desc = data;
270 int thislen = desc->fraglen + sg->length;
273 /* Worst case is 4 fragments: head, end of page 1, start
274 * of page 2, tail. Anything more is a bug. */
275 BUG_ON(desc->fragno > 3);
276 sg_set_page(&desc->frags[desc->fragno], sg_page(sg), sg->length,
279 desc->fraglen += sg->length;
281 fraglen = thislen & 7; /* XXX hardcoded blocksize */
287 sg_mark_end(&desc->frags[desc->fragno - 1]);
289 ret = crypto_blkcipher_decrypt_iv(&desc->desc, desc->frags,
290 desc->frags, thislen);
294 sg_init_table(desc->frags, 4);
297 sg_set_page(&desc->frags[0], sg_page(sg), fraglen,
298 sg->offset + sg->length - fraglen);
300 desc->fraglen = fraglen;
309 gss_decrypt_xdr_buf(struct crypto_blkcipher *tfm, struct xdr_buf *buf,
312 struct decryptor_desc desc;
315 BUG_ON((buf->len - offset) % crypto_blkcipher_blocksize(tfm) != 0);
317 memset(desc.iv, 0, sizeof(desc.iv));
319 desc.desc.info = desc.iv;
324 sg_init_table(desc.frags, 4);
326 return xdr_process_buf(buf, offset, buf->len - offset, decryptor, &desc);