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1da177e4 LT |
1 | /* |
2 | * linux/net/sunrpc/gss_krb5_crypto.c | |
3 | * | |
4 | * Copyright (c) 2000 The Regents of the University of Michigan. | |
5 | * All rights reserved. | |
6 | * | |
7 | * Andy Adamson <andros@umich.edu> | |
8 | * Bruce Fields <bfields@umich.edu> | |
9 | */ | |
10 | ||
11 | /* | |
12 | * Copyright (C) 1998 by the FundsXpress, INC. | |
13 | * | |
14 | * All rights reserved. | |
15 | * | |
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. | |
20 | * | |
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. | |
31 | * | |
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. | |
35 | */ | |
36 | ||
37 | #include <linux/types.h> | |
38 | #include <linux/mm.h> | |
39 | #include <linux/slab.h> | |
40 | #include <asm/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 | ||
46 | #ifdef RPC_DEBUG | |
47 | # define RPCDBG_FACILITY RPCDBG_AUTH | |
48 | #endif | |
49 | ||
50 | u32 | |
51 | krb5_encrypt( | |
52 | struct crypto_tfm *tfm, | |
53 | void * iv, | |
54 | void * in, | |
55 | void * out, | |
56 | int length) | |
57 | { | |
58 | u32 ret = -EINVAL; | |
59 | struct scatterlist sg[1]; | |
60 | u8 local_iv[16] = {0}; | |
61 | ||
62 | dprintk("RPC: krb5_encrypt: input data:\n"); | |
63 | print_hexl((u32 *)in, length, 0); | |
64 | ||
65 | if (length % crypto_tfm_alg_blocksize(tfm) != 0) | |
66 | goto out; | |
67 | ||
68 | if (crypto_tfm_alg_ivsize(tfm) > 16) { | |
69 | dprintk("RPC: gss_k5encrypt: tfm iv size to large %d\n", | |
70 | crypto_tfm_alg_ivsize(tfm)); | |
71 | goto out; | |
72 | } | |
73 | ||
74 | if (iv) | |
75 | memcpy(local_iv, iv, crypto_tfm_alg_ivsize(tfm)); | |
76 | ||
77 | memcpy(out, in, length); | |
78 | sg[0].page = virt_to_page(out); | |
79 | sg[0].offset = offset_in_page(out); | |
80 | sg[0].length = length; | |
81 | ||
82 | ret = crypto_cipher_encrypt_iv(tfm, sg, sg, length, local_iv); | |
83 | ||
84 | dprintk("RPC: krb5_encrypt: output data:\n"); | |
85 | print_hexl((u32 *)out, length, 0); | |
86 | out: | |
87 | dprintk("RPC: krb5_encrypt returns %d\n",ret); | |
88 | return(ret); | |
89 | } | |
90 | ||
91 | EXPORT_SYMBOL(krb5_encrypt); | |
92 | ||
93 | u32 | |
94 | krb5_decrypt( | |
95 | struct crypto_tfm *tfm, | |
96 | void * iv, | |
97 | void * in, | |
98 | void * out, | |
99 | int length) | |
100 | { | |
101 | u32 ret = -EINVAL; | |
102 | struct scatterlist sg[1]; | |
103 | u8 local_iv[16] = {0}; | |
104 | ||
105 | dprintk("RPC: krb5_decrypt: input data:\n"); | |
106 | print_hexl((u32 *)in, length, 0); | |
107 | ||
108 | if (length % crypto_tfm_alg_blocksize(tfm) != 0) | |
109 | goto out; | |
110 | ||
111 | if (crypto_tfm_alg_ivsize(tfm) > 16) { | |
112 | dprintk("RPC: gss_k5decrypt: tfm iv size to large %d\n", | |
113 | crypto_tfm_alg_ivsize(tfm)); | |
114 | goto out; | |
115 | } | |
116 | if (iv) | |
117 | memcpy(local_iv,iv, crypto_tfm_alg_ivsize(tfm)); | |
118 | ||
119 | memcpy(out, in, length); | |
120 | sg[0].page = virt_to_page(out); | |
121 | sg[0].offset = offset_in_page(out); | |
122 | sg[0].length = length; | |
123 | ||
124 | ret = crypto_cipher_decrypt_iv(tfm, sg, sg, length, local_iv); | |
125 | ||
126 | dprintk("RPC: krb5_decrypt: output_data:\n"); | |
127 | print_hexl((u32 *)out, length, 0); | |
128 | out: | |
129 | dprintk("RPC: gss_k5decrypt returns %d\n",ret); | |
130 | return(ret); | |
131 | } | |
132 | ||
133 | EXPORT_SYMBOL(krb5_decrypt); | |
134 | ||
135 | static void | |
136 | buf_to_sg(struct scatterlist *sg, char *ptr, int len) { | |
137 | sg->page = virt_to_page(ptr); | |
138 | sg->offset = offset_in_page(ptr); | |
139 | sg->length = len; | |
140 | } | |
141 | ||
f7b3af64 BF |
142 | static int |
143 | process_xdr_buf(struct xdr_buf *buf, int offset, int len, | |
144 | int (*actor)(struct scatterlist *, void *), void *data) | |
145 | { | |
146 | int i, page_len, thislen, page_offset, ret = 0; | |
147 | struct scatterlist sg[1]; | |
148 | ||
149 | if (offset >= buf->head[0].iov_len) { | |
150 | offset -= buf->head[0].iov_len; | |
151 | } else { | |
152 | thislen = buf->head[0].iov_len - offset; | |
153 | if (thislen > len) | |
154 | thislen = len; | |
155 | buf_to_sg(sg, buf->head[0].iov_base + offset, thislen); | |
156 | ret = actor(sg, data); | |
157 | if (ret) | |
158 | goto out; | |
159 | offset = 0; | |
160 | len -= thislen; | |
161 | } | |
162 | if (len == 0) | |
163 | goto out; | |
164 | ||
165 | if (offset >= buf->page_len) { | |
166 | offset -= buf->page_len; | |
167 | } else { | |
168 | page_len = buf->page_len - offset; | |
169 | if (page_len > len) | |
170 | page_len = len; | |
171 | len -= page_len; | |
172 | page_offset = (offset + buf->page_base) & (PAGE_CACHE_SIZE - 1); | |
173 | i = (offset + buf->page_base) >> PAGE_CACHE_SHIFT; | |
174 | thislen = PAGE_CACHE_SIZE - page_offset; | |
175 | do { | |
176 | if (thislen > page_len) | |
177 | thislen = page_len; | |
178 | sg->page = buf->pages[i]; | |
179 | sg->offset = page_offset; | |
180 | sg->length = thislen; | |
181 | ret = actor(sg, data); | |
182 | if (ret) | |
183 | goto out; | |
184 | page_len -= thislen; | |
185 | i++; | |
186 | page_offset = 0; | |
187 | thislen = PAGE_CACHE_SIZE; | |
188 | } while (page_len != 0); | |
189 | offset = 0; | |
190 | } | |
191 | if (len == 0) | |
192 | goto out; | |
193 | ||
194 | if (offset < buf->tail[0].iov_len) { | |
195 | thislen = buf->tail[0].iov_len - offset; | |
196 | if (thislen > len) | |
197 | thislen = len; | |
198 | buf_to_sg(sg, buf->tail[0].iov_base + offset, thislen); | |
199 | ret = actor(sg, data); | |
200 | len -= thislen; | |
201 | } | |
202 | if (len != 0) | |
203 | ret = -EINVAL; | |
204 | out: | |
205 | return ret; | |
206 | } | |
207 | ||
208 | static int | |
209 | checksummer(struct scatterlist *sg, void *data) | |
210 | { | |
211 | struct crypto_tfm *tfm = (struct crypto_tfm *)data; | |
212 | ||
213 | crypto_digest_update(tfm, sg, 1); | |
214 | ||
215 | return 0; | |
216 | } | |
217 | ||
1da177e4 LT |
218 | /* checksum the plaintext data and hdrlen bytes of the token header */ |
219 | s32 | |
220 | make_checksum(s32 cksumtype, char *header, int hdrlen, struct xdr_buf *body, | |
14ae162c | 221 | int body_offset, struct xdr_netobj *cksum) |
1da177e4 LT |
222 | { |
223 | char *cksumname; | |
224 | struct crypto_tfm *tfm = NULL; /* XXX add to ctx? */ | |
225 | struct scatterlist sg[1]; | |
226 | u32 code = GSS_S_FAILURE; | |
1da177e4 LT |
227 | |
228 | switch (cksumtype) { | |
229 | case CKSUMTYPE_RSA_MD5: | |
230 | cksumname = "md5"; | |
231 | break; | |
232 | default: | |
233 | dprintk("RPC: krb5_make_checksum:" | |
234 | " unsupported checksum %d", cksumtype); | |
235 | goto out; | |
236 | } | |
eb6f1160 | 237 | if (!(tfm = crypto_alloc_tfm(cksumname, CRYPTO_TFM_REQ_MAY_SLEEP))) |
1da177e4 LT |
238 | goto out; |
239 | cksum->len = crypto_tfm_alg_digestsize(tfm); | |
240 | if ((cksum->data = kmalloc(cksum->len, GFP_KERNEL)) == NULL) | |
241 | goto out; | |
242 | ||
243 | crypto_digest_init(tfm); | |
244 | buf_to_sg(sg, header, hdrlen); | |
245 | crypto_digest_update(tfm, sg, 1); | |
14ae162c BF |
246 | process_xdr_buf(body, body_offset, body->len - body_offset, |
247 | checksummer, tfm); | |
1da177e4 LT |
248 | crypto_digest_final(tfm, cksum->data); |
249 | code = 0; | |
250 | out: | |
573dbd95 | 251 | crypto_free_tfm(tfm); |
1da177e4 LT |
252 | return code; |
253 | } | |
254 | ||
255 | EXPORT_SYMBOL(make_checksum); | |
14ae162c BF |
256 | |
257 | struct encryptor_desc { | |
258 | u8 iv[8]; /* XXX hard-coded blocksize */ | |
259 | struct crypto_tfm *tfm; | |
260 | int pos; | |
261 | struct xdr_buf *outbuf; | |
262 | struct page **pages; | |
263 | struct scatterlist infrags[4]; | |
264 | struct scatterlist outfrags[4]; | |
265 | int fragno; | |
266 | int fraglen; | |
267 | }; | |
268 | ||
269 | static int | |
270 | encryptor(struct scatterlist *sg, void *data) | |
271 | { | |
272 | struct encryptor_desc *desc = data; | |
273 | struct xdr_buf *outbuf = desc->outbuf; | |
274 | struct page *in_page; | |
275 | int thislen = desc->fraglen + sg->length; | |
276 | int fraglen, ret; | |
277 | int page_pos; | |
278 | ||
279 | /* Worst case is 4 fragments: head, end of page 1, start | |
280 | * of page 2, tail. Anything more is a bug. */ | |
281 | BUG_ON(desc->fragno > 3); | |
282 | desc->infrags[desc->fragno] = *sg; | |
283 | desc->outfrags[desc->fragno] = *sg; | |
284 | ||
285 | page_pos = desc->pos - outbuf->head[0].iov_len; | |
286 | if (page_pos >= 0 && page_pos < outbuf->page_len) { | |
287 | /* pages are not in place: */ | |
288 | int i = (page_pos + outbuf->page_base) >> PAGE_CACHE_SHIFT; | |
289 | in_page = desc->pages[i]; | |
290 | } else { | |
291 | in_page = sg->page; | |
292 | } | |
293 | desc->infrags[desc->fragno].page = in_page; | |
294 | desc->fragno++; | |
295 | desc->fraglen += sg->length; | |
296 | desc->pos += sg->length; | |
297 | ||
298 | fraglen = thislen & 7; /* XXX hardcoded blocksize */ | |
299 | thislen -= fraglen; | |
300 | ||
301 | if (thislen == 0) | |
302 | return 0; | |
303 | ||
304 | ret = crypto_cipher_encrypt_iv(desc->tfm, desc->outfrags, desc->infrags, | |
305 | thislen, desc->iv); | |
306 | if (ret) | |
307 | return ret; | |
308 | if (fraglen) { | |
309 | desc->outfrags[0].page = sg->page; | |
310 | desc->outfrags[0].offset = sg->offset + sg->length - fraglen; | |
311 | desc->outfrags[0].length = fraglen; | |
312 | desc->infrags[0] = desc->outfrags[0]; | |
313 | desc->infrags[0].page = in_page; | |
314 | desc->fragno = 1; | |
315 | desc->fraglen = fraglen; | |
316 | } else { | |
317 | desc->fragno = 0; | |
318 | desc->fraglen = 0; | |
319 | } | |
320 | return 0; | |
321 | } | |
322 | ||
323 | int | |
324 | gss_encrypt_xdr_buf(struct crypto_tfm *tfm, struct xdr_buf *buf, int offset, | |
325 | struct page **pages) | |
326 | { | |
327 | int ret; | |
328 | struct encryptor_desc desc; | |
329 | ||
330 | BUG_ON((buf->len - offset) % crypto_tfm_alg_blocksize(tfm) != 0); | |
331 | ||
332 | memset(desc.iv, 0, sizeof(desc.iv)); | |
333 | desc.tfm = tfm; | |
334 | desc.pos = offset; | |
335 | desc.outbuf = buf; | |
336 | desc.pages = pages; | |
337 | desc.fragno = 0; | |
338 | desc.fraglen = 0; | |
339 | ||
340 | ret = process_xdr_buf(buf, offset, buf->len - offset, encryptor, &desc); | |
341 | return ret; | |
342 | } | |
343 | ||
344 | EXPORT_SYMBOL(gss_encrypt_xdr_buf); | |
345 | ||
346 | struct decryptor_desc { | |
347 | u8 iv[8]; /* XXX hard-coded blocksize */ | |
348 | struct crypto_tfm *tfm; | |
349 | struct scatterlist frags[4]; | |
350 | int fragno; | |
351 | int fraglen; | |
352 | }; | |
353 | ||
354 | static int | |
355 | decryptor(struct scatterlist *sg, void *data) | |
356 | { | |
357 | struct decryptor_desc *desc = data; | |
358 | int thislen = desc->fraglen + sg->length; | |
359 | int fraglen, ret; | |
360 | ||
361 | /* Worst case is 4 fragments: head, end of page 1, start | |
362 | * of page 2, tail. Anything more is a bug. */ | |
363 | BUG_ON(desc->fragno > 3); | |
364 | desc->frags[desc->fragno] = *sg; | |
365 | desc->fragno++; | |
366 | desc->fraglen += sg->length; | |
367 | ||
368 | fraglen = thislen & 7; /* XXX hardcoded blocksize */ | |
369 | thislen -= fraglen; | |
370 | ||
371 | if (thislen == 0) | |
372 | return 0; | |
373 | ||
374 | ret = crypto_cipher_decrypt_iv(desc->tfm, desc->frags, desc->frags, | |
375 | thislen, desc->iv); | |
376 | if (ret) | |
377 | return ret; | |
378 | if (fraglen) { | |
379 | desc->frags[0].page = sg->page; | |
380 | desc->frags[0].offset = sg->offset + sg->length - fraglen; | |
381 | desc->frags[0].length = fraglen; | |
382 | desc->fragno = 1; | |
383 | desc->fraglen = fraglen; | |
384 | } else { | |
385 | desc->fragno = 0; | |
386 | desc->fraglen = 0; | |
387 | } | |
388 | return 0; | |
389 | } | |
390 | ||
391 | int | |
392 | gss_decrypt_xdr_buf(struct crypto_tfm *tfm, struct xdr_buf *buf, int offset) | |
393 | { | |
394 | struct decryptor_desc desc; | |
395 | ||
396 | /* XXXJBF: */ | |
397 | BUG_ON((buf->len - offset) % crypto_tfm_alg_blocksize(tfm) != 0); | |
398 | ||
399 | memset(desc.iv, 0, sizeof(desc.iv)); | |
400 | desc.tfm = tfm; | |
401 | desc.fragno = 0; | |
402 | desc.fraglen = 0; | |
403 | return process_xdr_buf(buf, offset, buf->len - offset, decryptor, &desc); | |
404 | } | |
405 | ||
406 | EXPORT_SYMBOL(gss_decrypt_xdr_buf); |