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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / net / sunrpc / auth_gss / gss_krb5_mech.c
blob65427492b1c95f681f79345e7ce29c62d941e147
1 /*
2 * linux/net/sunrpc/gss_krb5_mech.c
3 *
4 * Copyright (c) 2001-2008 The Regents of the University of Michigan.
5 * All rights reserved.
6 *
7 * Andy Adamson <andros@umich.edu>
8 * J. Bruce Fields <bfields@umich.edu>
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 */
36
37 #include <crypto/hash.h>
38 #include <crypto/skcipher.h>
39 #include <linux/err.h>
40 #include <linux/module.h>
41 #include <linux/init.h>
42 #include <linux/types.h>
43 #include <linux/slab.h>
44 #include <linux/sunrpc/auth.h>
45 #include <linux/sunrpc/gss_krb5.h>
46 #include <linux/sunrpc/xdr.h>
47 #include <linux/sunrpc/gss_krb5_enctypes.h>
48
49 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
50 # define RPCDBG_FACILITY RPCDBG_AUTH
51 #endif
52
53 static struct gss_api_mech gss_kerberos_mech; /* forward declaration */
54
55 static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = {
56 /*
57 * DES (All DES enctypes are mapped to the same gss functionality)
58 */
59 {
60 .etype = ENCTYPE_DES_CBC_RAW,
61 .ctype = CKSUMTYPE_RSA_MD5,
62 .name = "des-cbc-crc",
63 .encrypt_name = "cbc(des)",
64 .cksum_name = "md5",
65 .encrypt = krb5_encrypt,
66 .decrypt = krb5_decrypt,
67 .mk_key = NULL,
68 .signalg = SGN_ALG_DES_MAC_MD5,
69 .sealalg = SEAL_ALG_DES,
70 .keybytes = 7,
71 .keylength = 8,
72 .blocksize = 8,
73 .conflen = 8,
74 .cksumlength = 8,
75 .keyed_cksum = 0,
76 },
77 /*
78 * RC4-HMAC
79 */
80 {
81 .etype = ENCTYPE_ARCFOUR_HMAC,
82 .ctype = CKSUMTYPE_HMAC_MD5_ARCFOUR,
83 .name = "rc4-hmac",
84 .encrypt_name = "ecb(arc4)",
85 .cksum_name = "hmac(md5)",
86 .encrypt = krb5_encrypt,
87 .decrypt = krb5_decrypt,
88 .mk_key = NULL,
89 .signalg = SGN_ALG_HMAC_MD5,
90 .sealalg = SEAL_ALG_MICROSOFT_RC4,
91 .keybytes = 16,
92 .keylength = 16,
93 .blocksize = 1,
94 .conflen = 8,
95 .cksumlength = 8,
96 .keyed_cksum = 1,
97 },
98 /*
99 * 3DES
100 */
101 {
102 .etype = ENCTYPE_DES3_CBC_RAW,
103 .ctype = CKSUMTYPE_HMAC_SHA1_DES3,
104 .name = "des3-hmac-sha1",
105 .encrypt_name = "cbc(des3_ede)",
106 .cksum_name = "hmac(sha1)",
107 .encrypt = krb5_encrypt,
108 .decrypt = krb5_decrypt,
109 .mk_key = gss_krb5_des3_make_key,
110 .signalg = SGN_ALG_HMAC_SHA1_DES3_KD,
111 .sealalg = SEAL_ALG_DES3KD,
112 .keybytes = 21,
113 .keylength = 24,
114 .blocksize = 8,
115 .conflen = 8,
116 .cksumlength = 20,
117 .keyed_cksum = 1,
118 },
119 /*
120 * AES128
121 */
122 {
123 .etype = ENCTYPE_AES128_CTS_HMAC_SHA1_96,
124 .ctype = CKSUMTYPE_HMAC_SHA1_96_AES128,
125 .name = "aes128-cts",
126 .encrypt_name = "cts(cbc(aes))",
127 .cksum_name = "hmac(sha1)",
128 .encrypt = krb5_encrypt,
129 .decrypt = krb5_decrypt,
130 .mk_key = gss_krb5_aes_make_key,
131 .encrypt_v2 = gss_krb5_aes_encrypt,
132 .decrypt_v2 = gss_krb5_aes_decrypt,
133 .signalg = -1,
134 .sealalg = -1,
135 .keybytes = 16,
136 .keylength = 16,
137 .blocksize = 16,
138 .conflen = 16,
139 .cksumlength = 12,
140 .keyed_cksum = 1,
141 },
142 /*
143 * AES256
144 */
145 {
146 .etype = ENCTYPE_AES256_CTS_HMAC_SHA1_96,
147 .ctype = CKSUMTYPE_HMAC_SHA1_96_AES256,
148 .name = "aes256-cts",
149 .encrypt_name = "cts(cbc(aes))",
150 .cksum_name = "hmac(sha1)",
151 .encrypt = krb5_encrypt,
152 .decrypt = krb5_decrypt,
153 .mk_key = gss_krb5_aes_make_key,
154 .encrypt_v2 = gss_krb5_aes_encrypt,
155 .decrypt_v2 = gss_krb5_aes_decrypt,
156 .signalg = -1,
157 .sealalg = -1,
158 .keybytes = 32,
159 .keylength = 32,
160 .blocksize = 16,
161 .conflen = 16,
162 .cksumlength = 12,
163 .keyed_cksum = 1,
164 },
165 };
166
167 static const int num_supported_enctypes =
168 ARRAY_SIZE(supported_gss_krb5_enctypes);
169
170 static int
171 supported_gss_krb5_enctype(int etype)
172 {
173 int i;
174 for (i = 0; i < num_supported_enctypes; i++)
175 if (supported_gss_krb5_enctypes[i].etype == etype)
176 return 1;
177 return 0;
178 }
179
180 static const struct gss_krb5_enctype *
181 get_gss_krb5_enctype(int etype)
182 {
183 int i;
184 for (i = 0; i < num_supported_enctypes; i++)
185 if (supported_gss_krb5_enctypes[i].etype == etype)
186 return &supported_gss_krb5_enctypes[i];
187 return NULL;
188 }
189
190 static const void *
191 simple_get_bytes(const void *p, const void *end, void *res, int len)
192 {
193 const void *q = (const void *)((const char *)p + len);
194 if (unlikely(q > end || q < p))
195 return ERR_PTR(-EFAULT);
196 memcpy(res, p, len);
197 return q;
198 }
199
200 static const void *
201 simple_get_netobj(const void *p, const void *end, struct xdr_netobj *res)
202 {
203 const void *q;
204 unsigned int len;
205
206 p = simple_get_bytes(p, end, &len, sizeof(len));
207 if (IS_ERR(p))
208 return p;
209 q = (const void *)((const char *)p + len);
210 if (unlikely(q > end || q < p))
211 return ERR_PTR(-EFAULT);
212 res->data = kmemdup(p, len, GFP_NOFS);
213 if (unlikely(res->data == NULL))
214 return ERR_PTR(-ENOMEM);
215 res->len = len;
216 return q;
217 }
218
219 static inline const void *
220 get_key(const void *p, const void *end,
221 struct krb5_ctx *ctx, struct crypto_skcipher **res)
222 {
223 struct xdr_netobj key;
224 int alg;
225
226 p = simple_get_bytes(p, end, &alg, sizeof(alg));
227 if (IS_ERR(p))
228 goto out_err;
229
230 switch (alg) {
231 case ENCTYPE_DES_CBC_CRC:
232 case ENCTYPE_DES_CBC_MD4:
233 case ENCTYPE_DES_CBC_MD5:
234 /* Map all these key types to ENCTYPE_DES_CBC_RAW */
235 alg = ENCTYPE_DES_CBC_RAW;
236 break;
237 }
238
239 if (!supported_gss_krb5_enctype(alg)) {
240 printk(KERN_WARNING "gss_kerberos_mech: unsupported "
241 "encryption key algorithm %d\n", alg);
242 p = ERR_PTR(-EINVAL);
243 goto out_err;
244 }
245 p = simple_get_netobj(p, end, &key);
246 if (IS_ERR(p))
247 goto out_err;
248
249 *res = crypto_alloc_skcipher(ctx->gk5e->encrypt_name, 0,
250 CRYPTO_ALG_ASYNC);
251 if (IS_ERR(*res)) {
252 printk(KERN_WARNING "gss_kerberos_mech: unable to initialize "
253 "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
254 *res = NULL;
255 goto out_err_free_key;
256 }
257 if (crypto_skcipher_setkey(*res, key.data, key.len)) {
258 printk(KERN_WARNING "gss_kerberos_mech: error setting key for "
259 "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
260 goto out_err_free_tfm;
261 }
262
263 kfree(key.data);
264 return p;
265
266 out_err_free_tfm:
267 crypto_free_skcipher(*res);
268 out_err_free_key:
269 kfree(key.data);
270 p = ERR_PTR(-EINVAL);
271 out_err:
272 return p;
273 }
274
275 static int
276 gss_import_v1_context(const void *p, const void *end, struct krb5_ctx *ctx)
277 {
278 int tmp;
279
280 p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate));
281 if (IS_ERR(p))
282 goto out_err;
283
284 /* Old format supports only DES! Any other enctype uses new format */
285 ctx->enctype = ENCTYPE_DES_CBC_RAW;
286
287 ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
288 if (ctx->gk5e == NULL) {
289 p = ERR_PTR(-EINVAL);
290 goto out_err;
291 }
292
293 /* The downcall format was designed before we completely understood
294 * the uses of the context fields; so it includes some stuff we
295 * just give some minimal sanity-checking, and some we ignore
296 * completely (like the next twenty bytes): */
297 if (unlikely(p + 20 > end || p + 20 < p)) {
298 p = ERR_PTR(-EFAULT);
299 goto out_err;
300 }
301 p += 20;
302 p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
303 if (IS_ERR(p))
304 goto out_err;
305 if (tmp != SGN_ALG_DES_MAC_MD5) {
306 p = ERR_PTR(-ENOSYS);
307 goto out_err;
308 }
309 p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
310 if (IS_ERR(p))
311 goto out_err;
312 if (tmp != SEAL_ALG_DES) {
313 p = ERR_PTR(-ENOSYS);
314 goto out_err;
315 }
316 p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
317 if (IS_ERR(p))
318 goto out_err;
319 p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send));
320 if (IS_ERR(p))
321 goto out_err;
322 p = simple_get_netobj(p, end, &ctx->mech_used);
323 if (IS_ERR(p))
324 goto out_err;
325 p = get_key(p, end, ctx, &ctx->enc);
326 if (IS_ERR(p))
327 goto out_err_free_mech;
328 p = get_key(p, end, ctx, &ctx->seq);
329 if (IS_ERR(p))
330 goto out_err_free_key1;
331 if (p != end) {
332 p = ERR_PTR(-EFAULT);
333 goto out_err_free_key2;
334 }
335
336 return 0;
337
338 out_err_free_key2:
339 crypto_free_skcipher(ctx->seq);
340 out_err_free_key1:
341 crypto_free_skcipher(ctx->enc);
342 out_err_free_mech:
343 kfree(ctx->mech_used.data);
344 out_err:
345 return PTR_ERR(p);
346 }
347
348 static struct crypto_skcipher *
349 context_v2_alloc_cipher(struct krb5_ctx *ctx, const char *cname, u8 *key)
350 {
351 struct crypto_skcipher *cp;
352
353 cp = crypto_alloc_skcipher(cname, 0, CRYPTO_ALG_ASYNC);
354 if (IS_ERR(cp)) {
355 dprintk("gss_kerberos_mech: unable to initialize "
356 "crypto algorithm %s\n", cname);
357 return NULL;
358 }
359 if (crypto_skcipher_setkey(cp, key, ctx->gk5e->keylength)) {
360 dprintk("gss_kerberos_mech: error setting key for "
361 "crypto algorithm %s\n", cname);
362 crypto_free_skcipher(cp);
363 return NULL;
364 }
365 return cp;
366 }
367
368 static inline void
369 set_cdata(u8 cdata[GSS_KRB5_K5CLENGTH], u32 usage, u8 seed)
370 {
371 cdata[0] = (usage>>24)&0xff;
372 cdata[1] = (usage>>16)&0xff;
373 cdata[2] = (usage>>8)&0xff;
374 cdata[3] = usage&0xff;
375 cdata[4] = seed;
376 }
377
378 static int
379 context_derive_keys_des3(struct krb5_ctx *ctx, gfp_t gfp_mask)
380 {
381 struct xdr_netobj c, keyin, keyout;
382 u8 cdata[GSS_KRB5_K5CLENGTH];
383 u32 err;
384
385 c.len = GSS_KRB5_K5CLENGTH;
386 c.data = cdata;
387
388 keyin.data = ctx->Ksess;
389 keyin.len = ctx->gk5e->keylength;
390 keyout.len = ctx->gk5e->keylength;
391
392 /* seq uses the raw key */
393 ctx->seq = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
394 ctx->Ksess);
395 if (ctx->seq == NULL)
396 goto out_err;
397
398 ctx->enc = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
399 ctx->Ksess);
400 if (ctx->enc == NULL)
401 goto out_free_seq;
402
403 /* derive cksum */
404 set_cdata(cdata, KG_USAGE_SIGN, KEY_USAGE_SEED_CHECKSUM);
405 keyout.data = ctx->cksum;
406 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
407 if (err) {
408 dprintk("%s: Error %d deriving cksum key\n",
409 __func__, err);
410 goto out_free_enc;
411 }
412
413 return 0;
414
415 out_free_enc:
416 crypto_free_skcipher(ctx->enc);
417 out_free_seq:
418 crypto_free_skcipher(ctx->seq);
419 out_err:
420 return -EINVAL;
421 }
422
423 /*
424 * Note that RC4 depends on deriving keys using the sequence
425 * number or the checksum of a token. Therefore, the final keys
426 * cannot be calculated until the token is being constructed!
427 */
428 static int
429 context_derive_keys_rc4(struct krb5_ctx *ctx)
430 {
431 struct crypto_shash *hmac;
432 char sigkeyconstant[] = "signaturekey";
433 int slen = strlen(sigkeyconstant) + 1; /* include null terminator */
434 struct shash_desc *desc;
435 int err;
436
437 dprintk("RPC: %s: entered\n", __func__);
438 /*
439 * derive cksum (aka Ksign) key
440 */
441 hmac = crypto_alloc_shash(ctx->gk5e->cksum_name, 0, 0);
442 if (IS_ERR(hmac)) {
443 dprintk("%s: error %ld allocating hash '%s'\n",
444 __func__, PTR_ERR(hmac), ctx->gk5e->cksum_name);
445 err = PTR_ERR(hmac);
446 goto out_err;
447 }
448
449 err = crypto_shash_setkey(hmac, ctx->Ksess, ctx->gk5e->keylength);
450 if (err)
451 goto out_err_free_hmac;
452
453
454 desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(hmac),
455 GFP_KERNEL);
456 if (!desc) {
457 dprintk("%s: failed to allocate hash descriptor for '%s'\n",
458 __func__, ctx->gk5e->cksum_name);
459 err = -ENOMEM;
460 goto out_err_free_hmac;
461 }
462
463 desc->tfm = hmac;
464 desc->flags = 0;
465
466 err = crypto_shash_digest(desc, sigkeyconstant, slen, ctx->cksum);
467 kzfree(desc);
468 if (err)
469 goto out_err_free_hmac;
470 /*
471 * allocate hash, and skciphers for data and seqnum encryption
472 */
473 ctx->enc = crypto_alloc_skcipher(ctx->gk5e->encrypt_name, 0,
474 CRYPTO_ALG_ASYNC);
475 if (IS_ERR(ctx->enc)) {
476 err = PTR_ERR(ctx->enc);
477 goto out_err_free_hmac;
478 }
479
480 ctx->seq = crypto_alloc_skcipher(ctx->gk5e->encrypt_name, 0,
481 CRYPTO_ALG_ASYNC);
482 if (IS_ERR(ctx->seq)) {
483 crypto_free_skcipher(ctx->enc);
484 err = PTR_ERR(ctx->seq);
485 goto out_err_free_hmac;
486 }
487
488 dprintk("RPC: %s: returning success\n", __func__);
489
490 err = 0;
491
492 out_err_free_hmac:
493 crypto_free_shash(hmac);
494 out_err:
495 dprintk("RPC: %s: returning %d\n", __func__, err);
496 return err;
497 }
498
499 static int
500 context_derive_keys_new(struct krb5_ctx *ctx, gfp_t gfp_mask)
501 {
502 struct xdr_netobj c, keyin, keyout;
503 u8 cdata[GSS_KRB5_K5CLENGTH];
504 u32 err;
505
506 c.len = GSS_KRB5_K5CLENGTH;
507 c.data = cdata;
508
509 keyin.data = ctx->Ksess;
510 keyin.len = ctx->gk5e->keylength;
511 keyout.len = ctx->gk5e->keylength;
512
513 /* initiator seal encryption */
514 set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
515 keyout.data = ctx->initiator_seal;
516 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
517 if (err) {
518 dprintk("%s: Error %d deriving initiator_seal key\n",
519 __func__, err);
520 goto out_err;
521 }
522 ctx->initiator_enc = context_v2_alloc_cipher(ctx,
523 ctx->gk5e->encrypt_name,
524 ctx->initiator_seal);
525 if (ctx->initiator_enc == NULL)
526 goto out_err;
527
528 /* acceptor seal encryption */
529 set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
530 keyout.data = ctx->acceptor_seal;
531 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
532 if (err) {
533 dprintk("%s: Error %d deriving acceptor_seal key\n",
534 __func__, err);
535 goto out_free_initiator_enc;
536 }
537 ctx->acceptor_enc = context_v2_alloc_cipher(ctx,
538 ctx->gk5e->encrypt_name,
539 ctx->acceptor_seal);
540 if (ctx->acceptor_enc == NULL)
541 goto out_free_initiator_enc;
542
543 /* initiator sign checksum */
544 set_cdata(cdata, KG_USAGE_INITIATOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
545 keyout.data = ctx->initiator_sign;
546 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
547 if (err) {
548 dprintk("%s: Error %d deriving initiator_sign key\n",
549 __func__, err);
550 goto out_free_acceptor_enc;
551 }
552
553 /* acceptor sign checksum */
554 set_cdata(cdata, KG_USAGE_ACCEPTOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
555 keyout.data = ctx->acceptor_sign;
556 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
557 if (err) {
558 dprintk("%s: Error %d deriving acceptor_sign key\n",
559 __func__, err);
560 goto out_free_acceptor_enc;
561 }
562
563 /* initiator seal integrity */
564 set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
565 keyout.data = ctx->initiator_integ;
566 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
567 if (err) {
568 dprintk("%s: Error %d deriving initiator_integ key\n",
569 __func__, err);
570 goto out_free_acceptor_enc;
571 }
572
573 /* acceptor seal integrity */
574 set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
575 keyout.data = ctx->acceptor_integ;
576 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
577 if (err) {
578 dprintk("%s: Error %d deriving acceptor_integ key\n",
579 __func__, err);
580 goto out_free_acceptor_enc;
581 }
582
583 switch (ctx->enctype) {
584 case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
585 case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
586 ctx->initiator_enc_aux =
587 context_v2_alloc_cipher(ctx, "cbc(aes)",
588 ctx->initiator_seal);
589 if (ctx->initiator_enc_aux == NULL)
590 goto out_free_acceptor_enc;
591 ctx->acceptor_enc_aux =
592 context_v2_alloc_cipher(ctx, "cbc(aes)",
593 ctx->acceptor_seal);
594 if (ctx->acceptor_enc_aux == NULL) {
595 crypto_free_skcipher(ctx->initiator_enc_aux);
596 goto out_free_acceptor_enc;
597 }
598 }
599
600 return 0;
601
602 out_free_acceptor_enc:
603 crypto_free_skcipher(ctx->acceptor_enc);
604 out_free_initiator_enc:
605 crypto_free_skcipher(ctx->initiator_enc);
606 out_err:
607 return -EINVAL;
608 }
609
610 static int
611 gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx,
612 gfp_t gfp_mask)
613 {
614 int keylen;
615
616 p = simple_get_bytes(p, end, &ctx->flags, sizeof(ctx->flags));
617 if (IS_ERR(p))
618 goto out_err;
619 ctx->initiate = ctx->flags & KRB5_CTX_FLAG_INITIATOR;
620
621 p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
622 if (IS_ERR(p))
623 goto out_err;
624 p = simple_get_bytes(p, end, &ctx->seq_send64, sizeof(ctx->seq_send64));
625 if (IS_ERR(p))
626 goto out_err;
627 /* set seq_send for use by "older" enctypes */
628 ctx->seq_send = ctx->seq_send64;
629 if (ctx->seq_send64 != ctx->seq_send) {
630 dprintk("%s: seq_send64 %lx, seq_send %x overflow?\n", __func__,
631 (unsigned long)ctx->seq_send64, ctx->seq_send);
632 p = ERR_PTR(-EINVAL);
633 goto out_err;
634 }
635 p = simple_get_bytes(p, end, &ctx->enctype, sizeof(ctx->enctype));
636 if (IS_ERR(p))
637 goto out_err;
638 /* Map ENCTYPE_DES3_CBC_SHA1 to ENCTYPE_DES3_CBC_RAW */
639 if (ctx->enctype == ENCTYPE_DES3_CBC_SHA1)
640 ctx->enctype = ENCTYPE_DES3_CBC_RAW;
641 ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
642 if (ctx->gk5e == NULL) {
643 dprintk("gss_kerberos_mech: unsupported krb5 enctype %u\n",
644 ctx->enctype);
645 p = ERR_PTR(-EINVAL);
646 goto out_err;
647 }
648 keylen = ctx->gk5e->keylength;
649
650 p = simple_get_bytes(p, end, ctx->Ksess, keylen);
651 if (IS_ERR(p))
652 goto out_err;
653
654 if (p != end) {
655 p = ERR_PTR(-EINVAL);
656 goto out_err;
657 }
658
659 ctx->mech_used.data = kmemdup(gss_kerberos_mech.gm_oid.data,
660 gss_kerberos_mech.gm_oid.len, gfp_mask);
661 if (unlikely(ctx->mech_used.data == NULL)) {
662 p = ERR_PTR(-ENOMEM);
663 goto out_err;
664 }
665 ctx->mech_used.len = gss_kerberos_mech.gm_oid.len;
666
667 switch (ctx->enctype) {
668 case ENCTYPE_DES3_CBC_RAW:
669 return context_derive_keys_des3(ctx, gfp_mask);
670 case ENCTYPE_ARCFOUR_HMAC:
671 return context_derive_keys_rc4(ctx);
672 case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
673 case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
674 return context_derive_keys_new(ctx, gfp_mask);
675 default:
676 return -EINVAL;
677 }
678
679 out_err:
680 return PTR_ERR(p);
681 }
682
683 static int
684 gss_import_sec_context_kerberos(const void *p, size_t len,
685 struct gss_ctx *ctx_id,
686 time_t *endtime,
687 gfp_t gfp_mask)
688 {
689 const void *end = (const void *)((const char *)p + len);
690 struct krb5_ctx *ctx;
691 int ret;
692
693 ctx = kzalloc(sizeof(*ctx), gfp_mask);
694 if (ctx == NULL)
695 return -ENOMEM;
696
697 if (len == 85)
698 ret = gss_import_v1_context(p, end, ctx);
699 else
700 ret = gss_import_v2_context(p, end, ctx, gfp_mask);
701
702 if (ret == 0) {
703 ctx_id->internal_ctx_id = ctx;
704 if (endtime)
705 *endtime = ctx->endtime;
706 } else
707 kfree(ctx);
708
709 dprintk("RPC: %s: returning %d\n", __func__, ret);
710 return ret;
711 }
712
713 static void
714 gss_delete_sec_context_kerberos(void *internal_ctx) {
715 struct krb5_ctx *kctx = internal_ctx;
716
717 crypto_free_skcipher(kctx->seq);
718 crypto_free_skcipher(kctx->enc);
719 crypto_free_skcipher(kctx->acceptor_enc);
720 crypto_free_skcipher(kctx->initiator_enc);
721 crypto_free_skcipher(kctx->acceptor_enc_aux);
722 crypto_free_skcipher(kctx->initiator_enc_aux);
723 kfree(kctx->mech_used.data);
724 kfree(kctx);
725 }
726
727 static const struct gss_api_ops gss_kerberos_ops = {
728 .gss_import_sec_context = gss_import_sec_context_kerberos,
729 .gss_get_mic = gss_get_mic_kerberos,
730 .gss_verify_mic = gss_verify_mic_kerberos,
731 .gss_wrap = gss_wrap_kerberos,
732 .gss_unwrap = gss_unwrap_kerberos,
733 .gss_delete_sec_context = gss_delete_sec_context_kerberos,
734 };
735
736 static struct pf_desc gss_kerberos_pfs[] = {
737 [0] = {
738 .pseudoflavor = RPC_AUTH_GSS_KRB5,
739 .qop = GSS_C_QOP_DEFAULT,
740 .service = RPC_GSS_SVC_NONE,
741 .name = "krb5",
742 },
743 [1] = {
744 .pseudoflavor = RPC_AUTH_GSS_KRB5I,
745 .qop = GSS_C_QOP_DEFAULT,
746 .service = RPC_GSS_SVC_INTEGRITY,
747 .name = "krb5i",
748 },
749 [2] = {
750 .pseudoflavor = RPC_AUTH_GSS_KRB5P,
751 .qop = GSS_C_QOP_DEFAULT,
752 .service = RPC_GSS_SVC_PRIVACY,
753 .name = "krb5p",
754 },
755 };
756
757 MODULE_ALIAS("rpc-auth-gss-krb5");
758 MODULE_ALIAS("rpc-auth-gss-krb5i");
759 MODULE_ALIAS("rpc-auth-gss-krb5p");
760 MODULE_ALIAS("rpc-auth-gss-390003");
761 MODULE_ALIAS("rpc-auth-gss-390004");
762 MODULE_ALIAS("rpc-auth-gss-390005");
763 MODULE_ALIAS("rpc-auth-gss-1.2.840.113554.1.2.2");
764
765 static struct gss_api_mech gss_kerberos_mech = {
766 .gm_name = "krb5",
767 .gm_owner = THIS_MODULE,
768 .gm_oid = { 9, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02" },
769 .gm_ops = &gss_kerberos_ops,
770 .gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs),
771 .gm_pfs = gss_kerberos_pfs,
772 .gm_upcall_enctypes = KRB5_SUPPORTED_ENCTYPES,
773 };
774
775 static int __init init_kerberos_module(void)
776 {
777 int status;
778
779 status = gss_mech_register(&gss_kerberos_mech);
780 if (status)
781 printk("Failed to register kerberos gss mechanism!\n");
782 return status;
783 }
784
785 static void __exit cleanup_kerberos_module(void)
786 {
787 gss_mech_unregister(&gss_kerberos_mech);
788 }
789
790 MODULE_LICENSE("GPL");
791 module_init(init_kerberos_module);
792 module_exit(cleanup_kerberos_module);
Linux with added FPC-III support