Commit | Line | Data |
---|---|---|
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> | |
378f058c | 40 | #include <linux/scatterlist.h> |
1da177e4 LT |
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); | |
378f058c | 78 | sg_set_buf(&sg[0], out, length); |
1da177e4 LT |
79 | |
80 | ret = crypto_cipher_encrypt_iv(tfm, sg, sg, length, local_iv); | |
81 | ||
82 | dprintk("RPC: krb5_encrypt: output data:\n"); | |
83 | print_hexl((u32 *)out, length, 0); | |
84 | out: | |
85 | dprintk("RPC: krb5_encrypt returns %d\n",ret); | |
86 | return(ret); | |
87 | } | |
88 | ||
89 | EXPORT_SYMBOL(krb5_encrypt); | |
90 | ||
91 | u32 | |
92 | krb5_decrypt( | |
93 | struct crypto_tfm *tfm, | |
94 | void * iv, | |
95 | void * in, | |
96 | void * out, | |
97 | int length) | |
98 | { | |
99 | u32 ret = -EINVAL; | |
100 | struct scatterlist sg[1]; | |
101 | u8 local_iv[16] = {0}; | |
102 | ||
103 | dprintk("RPC: krb5_decrypt: input data:\n"); | |
104 | print_hexl((u32 *)in, length, 0); | |
105 | ||
106 | if (length % crypto_tfm_alg_blocksize(tfm) != 0) | |
107 | goto out; | |
108 | ||
109 | if (crypto_tfm_alg_ivsize(tfm) > 16) { | |
110 | dprintk("RPC: gss_k5decrypt: tfm iv size to large %d\n", | |
111 | crypto_tfm_alg_ivsize(tfm)); | |
112 | goto out; | |
113 | } | |
114 | if (iv) | |
115 | memcpy(local_iv,iv, crypto_tfm_alg_ivsize(tfm)); | |
116 | ||
117 | memcpy(out, in, length); | |
378f058c | 118 | sg_set_buf(&sg[0], out, length); |
1da177e4 LT |
119 | |
120 | ret = crypto_cipher_decrypt_iv(tfm, sg, sg, length, local_iv); | |
121 | ||
122 | dprintk("RPC: krb5_decrypt: output_data:\n"); | |
123 | print_hexl((u32 *)out, length, 0); | |
124 | out: | |
125 | dprintk("RPC: gss_k5decrypt returns %d\n",ret); | |
126 | return(ret); | |
127 | } | |
128 | ||
129 | EXPORT_SYMBOL(krb5_decrypt); | |
130 | ||
f7b3af64 BF |
131 | static int |
132 | process_xdr_buf(struct xdr_buf *buf, int offset, int len, | |
133 | int (*actor)(struct scatterlist *, void *), void *data) | |
134 | { | |
135 | int i, page_len, thislen, page_offset, ret = 0; | |
136 | struct scatterlist sg[1]; | |
137 | ||
138 | if (offset >= buf->head[0].iov_len) { | |
139 | offset -= buf->head[0].iov_len; | |
140 | } else { | |
141 | thislen = buf->head[0].iov_len - offset; | |
142 | if (thislen > len) | |
143 | thislen = len; | |
378f058c | 144 | sg_set_buf(sg, buf->head[0].iov_base + offset, thislen); |
f7b3af64 BF |
145 | ret = actor(sg, data); |
146 | if (ret) | |
147 | goto out; | |
148 | offset = 0; | |
149 | len -= thislen; | |
150 | } | |
151 | if (len == 0) | |
152 | goto out; | |
153 | ||
154 | if (offset >= buf->page_len) { | |
155 | offset -= buf->page_len; | |
156 | } else { | |
157 | page_len = buf->page_len - offset; | |
158 | if (page_len > len) | |
159 | page_len = len; | |
160 | len -= page_len; | |
161 | page_offset = (offset + buf->page_base) & (PAGE_CACHE_SIZE - 1); | |
162 | i = (offset + buf->page_base) >> PAGE_CACHE_SHIFT; | |
163 | thislen = PAGE_CACHE_SIZE - page_offset; | |
164 | do { | |
165 | if (thislen > page_len) | |
166 | thislen = page_len; | |
167 | sg->page = buf->pages[i]; | |
168 | sg->offset = page_offset; | |
169 | sg->length = thislen; | |
170 | ret = actor(sg, data); | |
171 | if (ret) | |
172 | goto out; | |
173 | page_len -= thislen; | |
174 | i++; | |
175 | page_offset = 0; | |
176 | thislen = PAGE_CACHE_SIZE; | |
177 | } while (page_len != 0); | |
178 | offset = 0; | |
179 | } | |
180 | if (len == 0) | |
181 | goto out; | |
182 | ||
183 | if (offset < buf->tail[0].iov_len) { | |
184 | thislen = buf->tail[0].iov_len - offset; | |
185 | if (thislen > len) | |
186 | thislen = len; | |
378f058c | 187 | sg_set_buf(sg, buf->tail[0].iov_base + offset, thislen); |
f7b3af64 BF |
188 | ret = actor(sg, data); |
189 | len -= thislen; | |
190 | } | |
191 | if (len != 0) | |
192 | ret = -EINVAL; | |
193 | out: | |
194 | return ret; | |
195 | } | |
196 | ||
197 | static int | |
198 | checksummer(struct scatterlist *sg, void *data) | |
199 | { | |
200 | struct crypto_tfm *tfm = (struct crypto_tfm *)data; | |
201 | ||
202 | crypto_digest_update(tfm, sg, 1); | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
1da177e4 LT |
207 | /* checksum the plaintext data and hdrlen bytes of the token header */ |
208 | s32 | |
209 | make_checksum(s32 cksumtype, char *header, int hdrlen, struct xdr_buf *body, | |
14ae162c | 210 | int body_offset, struct xdr_netobj *cksum) |
1da177e4 LT |
211 | { |
212 | char *cksumname; | |
213 | struct crypto_tfm *tfm = NULL; /* XXX add to ctx? */ | |
214 | struct scatterlist sg[1]; | |
215 | u32 code = GSS_S_FAILURE; | |
1da177e4 LT |
216 | |
217 | switch (cksumtype) { | |
218 | case CKSUMTYPE_RSA_MD5: | |
219 | cksumname = "md5"; | |
220 | break; | |
221 | default: | |
222 | dprintk("RPC: krb5_make_checksum:" | |
223 | " unsupported checksum %d", cksumtype); | |
224 | goto out; | |
225 | } | |
eb6f1160 | 226 | if (!(tfm = crypto_alloc_tfm(cksumname, CRYPTO_TFM_REQ_MAY_SLEEP))) |
1da177e4 LT |
227 | goto out; |
228 | cksum->len = crypto_tfm_alg_digestsize(tfm); | |
229 | if ((cksum->data = kmalloc(cksum->len, GFP_KERNEL)) == NULL) | |
230 | goto out; | |
231 | ||
232 | crypto_digest_init(tfm); | |
378f058c | 233 | sg_set_buf(sg, header, hdrlen); |
1da177e4 | 234 | crypto_digest_update(tfm, sg, 1); |
14ae162c BF |
235 | process_xdr_buf(body, body_offset, body->len - body_offset, |
236 | checksummer, tfm); | |
1da177e4 LT |
237 | crypto_digest_final(tfm, cksum->data); |
238 | code = 0; | |
239 | out: | |
573dbd95 | 240 | crypto_free_tfm(tfm); |
1da177e4 LT |
241 | return code; |
242 | } | |
243 | ||
244 | EXPORT_SYMBOL(make_checksum); | |
14ae162c BF |
245 | |
246 | struct encryptor_desc { | |
247 | u8 iv[8]; /* XXX hard-coded blocksize */ | |
248 | struct crypto_tfm *tfm; | |
249 | int pos; | |
250 | struct xdr_buf *outbuf; | |
251 | struct page **pages; | |
252 | struct scatterlist infrags[4]; | |
253 | struct scatterlist outfrags[4]; | |
254 | int fragno; | |
255 | int fraglen; | |
256 | }; | |
257 | ||
258 | static int | |
259 | encryptor(struct scatterlist *sg, void *data) | |
260 | { | |
261 | struct encryptor_desc *desc = data; | |
262 | struct xdr_buf *outbuf = desc->outbuf; | |
263 | struct page *in_page; | |
264 | int thislen = desc->fraglen + sg->length; | |
265 | int fraglen, ret; | |
266 | int page_pos; | |
267 | ||
268 | /* Worst case is 4 fragments: head, end of page 1, start | |
269 | * of page 2, tail. Anything more is a bug. */ | |
270 | BUG_ON(desc->fragno > 3); | |
271 | desc->infrags[desc->fragno] = *sg; | |
272 | desc->outfrags[desc->fragno] = *sg; | |
273 | ||
274 | page_pos = desc->pos - outbuf->head[0].iov_len; | |
275 | if (page_pos >= 0 && page_pos < outbuf->page_len) { | |
276 | /* pages are not in place: */ | |
277 | int i = (page_pos + outbuf->page_base) >> PAGE_CACHE_SHIFT; | |
278 | in_page = desc->pages[i]; | |
279 | } else { | |
280 | in_page = sg->page; | |
281 | } | |
282 | desc->infrags[desc->fragno].page = in_page; | |
283 | desc->fragno++; | |
284 | desc->fraglen += sg->length; | |
285 | desc->pos += sg->length; | |
286 | ||
287 | fraglen = thislen & 7; /* XXX hardcoded blocksize */ | |
288 | thislen -= fraglen; | |
289 | ||
290 | if (thislen == 0) | |
291 | return 0; | |
292 | ||
293 | ret = crypto_cipher_encrypt_iv(desc->tfm, desc->outfrags, desc->infrags, | |
294 | thislen, desc->iv); | |
295 | if (ret) | |
296 | return ret; | |
297 | if (fraglen) { | |
298 | desc->outfrags[0].page = sg->page; | |
299 | desc->outfrags[0].offset = sg->offset + sg->length - fraglen; | |
300 | desc->outfrags[0].length = fraglen; | |
301 | desc->infrags[0] = desc->outfrags[0]; | |
302 | desc->infrags[0].page = in_page; | |
303 | desc->fragno = 1; | |
304 | desc->fraglen = fraglen; | |
305 | } else { | |
306 | desc->fragno = 0; | |
307 | desc->fraglen = 0; | |
308 | } | |
309 | return 0; | |
310 | } | |
311 | ||
312 | int | |
313 | gss_encrypt_xdr_buf(struct crypto_tfm *tfm, struct xdr_buf *buf, int offset, | |
314 | struct page **pages) | |
315 | { | |
316 | int ret; | |
317 | struct encryptor_desc desc; | |
318 | ||
319 | BUG_ON((buf->len - offset) % crypto_tfm_alg_blocksize(tfm) != 0); | |
320 | ||
321 | memset(desc.iv, 0, sizeof(desc.iv)); | |
322 | desc.tfm = tfm; | |
323 | desc.pos = offset; | |
324 | desc.outbuf = buf; | |
325 | desc.pages = pages; | |
326 | desc.fragno = 0; | |
327 | desc.fraglen = 0; | |
328 | ||
329 | ret = process_xdr_buf(buf, offset, buf->len - offset, encryptor, &desc); | |
330 | return ret; | |
331 | } | |
332 | ||
333 | EXPORT_SYMBOL(gss_encrypt_xdr_buf); | |
334 | ||
335 | struct decryptor_desc { | |
336 | u8 iv[8]; /* XXX hard-coded blocksize */ | |
337 | struct crypto_tfm *tfm; | |
338 | struct scatterlist frags[4]; | |
339 | int fragno; | |
340 | int fraglen; | |
341 | }; | |
342 | ||
343 | static int | |
344 | decryptor(struct scatterlist *sg, void *data) | |
345 | { | |
346 | struct decryptor_desc *desc = data; | |
347 | int thislen = desc->fraglen + sg->length; | |
348 | int fraglen, ret; | |
349 | ||
350 | /* Worst case is 4 fragments: head, end of page 1, start | |
351 | * of page 2, tail. Anything more is a bug. */ | |
352 | BUG_ON(desc->fragno > 3); | |
353 | desc->frags[desc->fragno] = *sg; | |
354 | desc->fragno++; | |
355 | desc->fraglen += sg->length; | |
356 | ||
357 | fraglen = thislen & 7; /* XXX hardcoded blocksize */ | |
358 | thislen -= fraglen; | |
359 | ||
360 | if (thislen == 0) | |
361 | return 0; | |
362 | ||
363 | ret = crypto_cipher_decrypt_iv(desc->tfm, desc->frags, desc->frags, | |
364 | thislen, desc->iv); | |
365 | if (ret) | |
366 | return ret; | |
367 | if (fraglen) { | |
368 | desc->frags[0].page = sg->page; | |
369 | desc->frags[0].offset = sg->offset + sg->length - fraglen; | |
370 | desc->frags[0].length = fraglen; | |
371 | desc->fragno = 1; | |
372 | desc->fraglen = fraglen; | |
373 | } else { | |
374 | desc->fragno = 0; | |
375 | desc->fraglen = 0; | |
376 | } | |
377 | return 0; | |
378 | } | |
379 | ||
380 | int | |
381 | gss_decrypt_xdr_buf(struct crypto_tfm *tfm, struct xdr_buf *buf, int offset) | |
382 | { | |
383 | struct decryptor_desc desc; | |
384 | ||
385 | /* XXXJBF: */ | |
386 | BUG_ON((buf->len - offset) % crypto_tfm_alg_blocksize(tfm) != 0); | |
387 | ||
388 | memset(desc.iv, 0, sizeof(desc.iv)); | |
389 | desc.tfm = tfm; | |
390 | desc.fragno = 0; | |
391 | desc.fraglen = 0; | |
392 | return process_xdr_buf(buf, offset, buf->len - offset, decryptor, &desc); | |
393 | } | |
394 | ||
395 | EXPORT_SYMBOL(gss_decrypt_xdr_buf); |