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[linux-2.6/next.git] / net / sunrpc / auth_gss / gss_krb5_mech.c
blob032644610524306ea0e01383b3c4ea54888b10ab
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 <linux/err.h>
38 #include <linux/module.h>
39 #include <linux/init.h>
40 #include <linux/types.h>
41 #include <linux/slab.h>
42 #include <linux/sunrpc/auth.h>
43 #include <linux/sunrpc/gss_krb5.h>
44 #include <linux/sunrpc/xdr.h>
45 #include <linux/crypto.h>
46
47 #ifdef RPC_DEBUG
48 # define RPCDBG_FACILITY RPCDBG_AUTH
49 #endif
50
51 static struct gss_api_mech gss_kerberos_mech; /* forward declaration */
52
53 static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = {
54 /*
55 * DES (All DES enctypes are mapped to the same gss functionality)
56 */
57 {
58 .etype = ENCTYPE_DES_CBC_RAW,
59 .ctype = CKSUMTYPE_RSA_MD5,
60 .name = "des-cbc-crc",
61 .encrypt_name = "cbc(des)",
62 .cksum_name = "md5",
63 .encrypt = krb5_encrypt,
64 .decrypt = krb5_decrypt,
65 .mk_key = NULL,
66 .signalg = SGN_ALG_DES_MAC_MD5,
67 .sealalg = SEAL_ALG_DES,
68 .keybytes = 7,
69 .keylength = 8,
70 .blocksize = 8,
71 .conflen = 8,
72 .cksumlength = 8,
73 .keyed_cksum = 0,
74 },
75 /*
76 * RC4-HMAC
77 */
78 {
79 .etype = ENCTYPE_ARCFOUR_HMAC,
80 .ctype = CKSUMTYPE_HMAC_MD5_ARCFOUR,
81 .name = "rc4-hmac",
82 .encrypt_name = "ecb(arc4)",
83 .cksum_name = "hmac(md5)",
84 .encrypt = krb5_encrypt,
85 .decrypt = krb5_decrypt,
86 .mk_key = NULL,
87 .signalg = SGN_ALG_HMAC_MD5,
88 .sealalg = SEAL_ALG_MICROSOFT_RC4,
89 .keybytes = 16,
90 .keylength = 16,
91 .blocksize = 1,
92 .conflen = 8,
93 .cksumlength = 8,
94 .keyed_cksum = 1,
95 },
96 /*
97 * 3DES
98 */
99 {
100 .etype = ENCTYPE_DES3_CBC_RAW,
101 .ctype = CKSUMTYPE_HMAC_SHA1_DES3,
102 .name = "des3-hmac-sha1",
103 .encrypt_name = "cbc(des3_ede)",
104 .cksum_name = "hmac(sha1)",
105 .encrypt = krb5_encrypt,
106 .decrypt = krb5_decrypt,
107 .mk_key = gss_krb5_des3_make_key,
108 .signalg = SGN_ALG_HMAC_SHA1_DES3_KD,
109 .sealalg = SEAL_ALG_DES3KD,
110 .keybytes = 21,
111 .keylength = 24,
112 .blocksize = 8,
113 .conflen = 8,
114 .cksumlength = 20,
115 .keyed_cksum = 1,
116 },
117 /*
118 * AES128
119 */
120 {
121 .etype = ENCTYPE_AES128_CTS_HMAC_SHA1_96,
122 .ctype = CKSUMTYPE_HMAC_SHA1_96_AES128,
123 .name = "aes128-cts",
124 .encrypt_name = "cts(cbc(aes))",
125 .cksum_name = "hmac(sha1)",
126 .encrypt = krb5_encrypt,
127 .decrypt = krb5_decrypt,
128 .mk_key = gss_krb5_aes_make_key,
129 .encrypt_v2 = gss_krb5_aes_encrypt,
130 .decrypt_v2 = gss_krb5_aes_decrypt,
131 .signalg = -1,
132 .sealalg = -1,
133 .keybytes = 16,
134 .keylength = 16,
135 .blocksize = 16,
136 .conflen = 16,
137 .cksumlength = 12,
138 .keyed_cksum = 1,
139 },
140 /*
141 * AES256
142 */
143 {
144 .etype = ENCTYPE_AES256_CTS_HMAC_SHA1_96,
145 .ctype = CKSUMTYPE_HMAC_SHA1_96_AES256,
146 .name = "aes256-cts",
147 .encrypt_name = "cts(cbc(aes))",
148 .cksum_name = "hmac(sha1)",
149 .encrypt = krb5_encrypt,
150 .decrypt = krb5_decrypt,
151 .mk_key = gss_krb5_aes_make_key,
152 .encrypt_v2 = gss_krb5_aes_encrypt,
153 .decrypt_v2 = gss_krb5_aes_decrypt,
154 .signalg = -1,
155 .sealalg = -1,
156 .keybytes = 32,
157 .keylength = 32,
158 .blocksize = 16,
159 .conflen = 16,
160 .cksumlength = 12,
161 .keyed_cksum = 1,
162 },
163 };
164
165 static const int num_supported_enctypes =
166 ARRAY_SIZE(supported_gss_krb5_enctypes);
167
168 static int
169 supported_gss_krb5_enctype(int etype)
170 {
171 int i;
172 for (i = 0; i < num_supported_enctypes; i++)
173 if (supported_gss_krb5_enctypes[i].etype == etype)
174 return 1;
175 return 0;
176 }
177
178 static const struct gss_krb5_enctype *
179 get_gss_krb5_enctype(int etype)
180 {
181 int i;
182 for (i = 0; i < num_supported_enctypes; i++)
183 if (supported_gss_krb5_enctypes[i].etype == etype)
184 return &supported_gss_krb5_enctypes[i];
185 return NULL;
186 }
187
188 static const void *
189 simple_get_bytes(const void *p, const void *end, void *res, int len)
190 {
191 const void *q = (const void *)((const char *)p + len);
192 if (unlikely(q > end || q < p))
193 return ERR_PTR(-EFAULT);
194 memcpy(res, p, len);
195 return q;
196 }
197
198 static const void *
199 simple_get_netobj(const void *p, const void *end, struct xdr_netobj *res)
200 {
201 const void *q;
202 unsigned int len;
203
204 p = simple_get_bytes(p, end, &len, sizeof(len));
205 if (IS_ERR(p))
206 return p;
207 q = (const void *)((const char *)p + len);
208 if (unlikely(q > end || q < p))
209 return ERR_PTR(-EFAULT);
210 res->data = kmemdup(p, len, GFP_NOFS);
211 if (unlikely(res->data == NULL))
212 return ERR_PTR(-ENOMEM);
213 res->len = len;
214 return q;
215 }
216
217 static inline const void *
218 get_key(const void *p, const void *end,
219 struct krb5_ctx *ctx, struct crypto_blkcipher **res)
220 {
221 struct xdr_netobj key;
222 int alg;
223
224 p = simple_get_bytes(p, end, &alg, sizeof(alg));
225 if (IS_ERR(p))
226 goto out_err;
227
228 switch (alg) {
229 case ENCTYPE_DES_CBC_CRC:
230 case ENCTYPE_DES_CBC_MD4:
231 case ENCTYPE_DES_CBC_MD5:
232 /* Map all these key types to ENCTYPE_DES_CBC_RAW */
233 alg = ENCTYPE_DES_CBC_RAW;
234 break;
235 }
236
237 if (!supported_gss_krb5_enctype(alg)) {
238 printk(KERN_WARNING "gss_kerberos_mech: unsupported "
239 "encryption key algorithm %d\n", alg);
240 goto out_err;
241 }
242 p = simple_get_netobj(p, end, &key);
243 if (IS_ERR(p))
244 goto out_err;
245
246 *res = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
247 CRYPTO_ALG_ASYNC);
248 if (IS_ERR(*res)) {
249 printk(KERN_WARNING "gss_kerberos_mech: unable to initialize "
250 "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
251 *res = NULL;
252 goto out_err_free_key;
253 }
254 if (crypto_blkcipher_setkey(*res, key.data, key.len)) {
255 printk(KERN_WARNING "gss_kerberos_mech: error setting key for "
256 "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
257 goto out_err_free_tfm;
258 }
259
260 kfree(key.data);
261 return p;
262
263 out_err_free_tfm:
264 crypto_free_blkcipher(*res);
265 out_err_free_key:
266 kfree(key.data);
267 p = ERR_PTR(-EINVAL);
268 out_err:
269 return p;
270 }
271
272 static int
273 gss_import_v1_context(const void *p, const void *end, struct krb5_ctx *ctx)
274 {
275 int tmp;
276
277 p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate));
278 if (IS_ERR(p))
279 goto out_err;
280
281 /* Old format supports only DES! Any other enctype uses new format */
282 ctx->enctype = ENCTYPE_DES_CBC_RAW;
283
284 ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
285 if (ctx->gk5e == NULL)
286 goto out_err;
287
288 /* The downcall format was designed before we completely understood
289 * the uses of the context fields; so it includes some stuff we
290 * just give some minimal sanity-checking, and some we ignore
291 * completely (like the next twenty bytes): */
292 if (unlikely(p + 20 > end || p + 20 < p))
293 goto out_err;
294 p += 20;
295 p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
296 if (IS_ERR(p))
297 goto out_err;
298 if (tmp != SGN_ALG_DES_MAC_MD5) {
299 p = ERR_PTR(-ENOSYS);
300 goto out_err;
301 }
302 p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
303 if (IS_ERR(p))
304 goto out_err;
305 if (tmp != SEAL_ALG_DES) {
306 p = ERR_PTR(-ENOSYS);
307 goto out_err;
308 }
309 p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
310 if (IS_ERR(p))
311 goto out_err;
312 p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send));
313 if (IS_ERR(p))
314 goto out_err;
315 p = simple_get_netobj(p, end, &ctx->mech_used);
316 if (IS_ERR(p))
317 goto out_err;
318 p = get_key(p, end, ctx, &ctx->enc);
319 if (IS_ERR(p))
320 goto out_err_free_mech;
321 p = get_key(p, end, ctx, &ctx->seq);
322 if (IS_ERR(p))
323 goto out_err_free_key1;
324 if (p != end) {
325 p = ERR_PTR(-EFAULT);
326 goto out_err_free_key2;
327 }
328
329 return 0;
330
331 out_err_free_key2:
332 crypto_free_blkcipher(ctx->seq);
333 out_err_free_key1:
334 crypto_free_blkcipher(ctx->enc);
335 out_err_free_mech:
336 kfree(ctx->mech_used.data);
337 out_err:
338 return PTR_ERR(p);
339 }
340
341 struct crypto_blkcipher *
342 context_v2_alloc_cipher(struct krb5_ctx *ctx, const char *cname, u8 *key)
343 {
344 struct crypto_blkcipher *cp;
345
346 cp = crypto_alloc_blkcipher(cname, 0, CRYPTO_ALG_ASYNC);
347 if (IS_ERR(cp)) {
348 dprintk("gss_kerberos_mech: unable to initialize "
349 "crypto algorithm %s\n", cname);
350 return NULL;
351 }
352 if (crypto_blkcipher_setkey(cp, key, ctx->gk5e->keylength)) {
353 dprintk("gss_kerberos_mech: error setting key for "
354 "crypto algorithm %s\n", cname);
355 crypto_free_blkcipher(cp);
356 return NULL;
357 }
358 return cp;
359 }
360
361 static inline void
362 set_cdata(u8 cdata[GSS_KRB5_K5CLENGTH], u32 usage, u8 seed)
363 {
364 cdata[0] = (usage>>24)&0xff;
365 cdata[1] = (usage>>16)&0xff;
366 cdata[2] = (usage>>8)&0xff;
367 cdata[3] = usage&0xff;
368 cdata[4] = seed;
369 }
370
371 static int
372 context_derive_keys_des3(struct krb5_ctx *ctx, gfp_t gfp_mask)
373 {
374 struct xdr_netobj c, keyin, keyout;
375 u8 cdata[GSS_KRB5_K5CLENGTH];
376 u32 err;
377
378 c.len = GSS_KRB5_K5CLENGTH;
379 c.data = cdata;
380
381 keyin.data = ctx->Ksess;
382 keyin.len = ctx->gk5e->keylength;
383 keyout.len = ctx->gk5e->keylength;
384
385 /* seq uses the raw key */
386 ctx->seq = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
387 ctx->Ksess);
388 if (ctx->seq == NULL)
389 goto out_err;
390
391 ctx->enc = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
392 ctx->Ksess);
393 if (ctx->enc == NULL)
394 goto out_free_seq;
395
396 /* derive cksum */
397 set_cdata(cdata, KG_USAGE_SIGN, KEY_USAGE_SEED_CHECKSUM);
398 keyout.data = ctx->cksum;
399 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
400 if (err) {
401 dprintk("%s: Error %d deriving cksum key\n",
402 __func__, err);
403 goto out_free_enc;
404 }
405
406 return 0;
407
408 out_free_enc:
409 crypto_free_blkcipher(ctx->enc);
410 out_free_seq:
411 crypto_free_blkcipher(ctx->seq);
412 out_err:
413 return -EINVAL;
414 }
415
416 /*
417 * Note that RC4 depends on deriving keys using the sequence
418 * number or the checksum of a token. Therefore, the final keys
419 * cannot be calculated until the token is being constructed!
420 */
421 static int
422 context_derive_keys_rc4(struct krb5_ctx *ctx)
423 {
424 struct crypto_hash *hmac;
425 char sigkeyconstant[] = "signaturekey";
426 int slen = strlen(sigkeyconstant) + 1; /* include null terminator */
427 struct hash_desc desc;
428 struct scatterlist sg[1];
429 int err;
430
431 dprintk("RPC: %s: entered\n", __func__);
432 /*
433 * derive cksum (aka Ksign) key
434 */
435 hmac = crypto_alloc_hash(ctx->gk5e->cksum_name, 0, CRYPTO_ALG_ASYNC);
436 if (IS_ERR(hmac)) {
437 dprintk("%s: error %ld allocating hash '%s'\n",
438 __func__, PTR_ERR(hmac), ctx->gk5e->cksum_name);
439 err = PTR_ERR(hmac);
440 goto out_err;
441 }
442
443 err = crypto_hash_setkey(hmac, ctx->Ksess, ctx->gk5e->keylength);
444 if (err)
445 goto out_err_free_hmac;
446
447 sg_init_table(sg, 1);
448 sg_set_buf(sg, sigkeyconstant, slen);
449
450 desc.tfm = hmac;
451 desc.flags = 0;
452
453 err = crypto_hash_init(&desc);
454 if (err)
455 goto out_err_free_hmac;
456
457 err = crypto_hash_digest(&desc, sg, slen, ctx->cksum);
458 if (err)
459 goto out_err_free_hmac;
460 /*
461 * allocate hash, and blkciphers for data and seqnum encryption
462 */
463 ctx->enc = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
464 CRYPTO_ALG_ASYNC);
465 if (IS_ERR(ctx->enc)) {
466 err = PTR_ERR(ctx->enc);
467 goto out_err_free_hmac;
468 }
469
470 ctx->seq = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
471 CRYPTO_ALG_ASYNC);
472 if (IS_ERR(ctx->seq)) {
473 crypto_free_blkcipher(ctx->enc);
474 err = PTR_ERR(ctx->seq);
475 goto out_err_free_hmac;
476 }
477
478 dprintk("RPC: %s: returning success\n", __func__);
479
480 err = 0;
481
482 out_err_free_hmac:
483 crypto_free_hash(hmac);
484 out_err:
485 dprintk("RPC: %s: returning %d\n", __func__, err);
486 return err;
487 }
488
489 static int
490 context_derive_keys_new(struct krb5_ctx *ctx, gfp_t gfp_mask)
491 {
492 struct xdr_netobj c, keyin, keyout;
493 u8 cdata[GSS_KRB5_K5CLENGTH];
494 u32 err;
495
496 c.len = GSS_KRB5_K5CLENGTH;
497 c.data = cdata;
498
499 keyin.data = ctx->Ksess;
500 keyin.len = ctx->gk5e->keylength;
501 keyout.len = ctx->gk5e->keylength;
502
503 /* initiator seal encryption */
504 set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
505 keyout.data = ctx->initiator_seal;
506 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
507 if (err) {
508 dprintk("%s: Error %d deriving initiator_seal key\n",
509 __func__, err);
510 goto out_err;
511 }
512 ctx->initiator_enc = context_v2_alloc_cipher(ctx,
513 ctx->gk5e->encrypt_name,
514 ctx->initiator_seal);
515 if (ctx->initiator_enc == NULL)
516 goto out_err;
517
518 /* acceptor seal encryption */
519 set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
520 keyout.data = ctx->acceptor_seal;
521 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
522 if (err) {
523 dprintk("%s: Error %d deriving acceptor_seal key\n",
524 __func__, err);
525 goto out_free_initiator_enc;
526 }
527 ctx->acceptor_enc = context_v2_alloc_cipher(ctx,
528 ctx->gk5e->encrypt_name,
529 ctx->acceptor_seal);
530 if (ctx->acceptor_enc == NULL)
531 goto out_free_initiator_enc;
532
533 /* initiator sign checksum */
534 set_cdata(cdata, KG_USAGE_INITIATOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
535 keyout.data = ctx->initiator_sign;
536 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
537 if (err) {
538 dprintk("%s: Error %d deriving initiator_sign key\n",
539 __func__, err);
540 goto out_free_acceptor_enc;
541 }
542
543 /* acceptor sign checksum */
544 set_cdata(cdata, KG_USAGE_ACCEPTOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
545 keyout.data = ctx->acceptor_sign;
546 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
547 if (err) {
548 dprintk("%s: Error %d deriving acceptor_sign key\n",
549 __func__, err);
550 goto out_free_acceptor_enc;
551 }
552
553 /* initiator seal integrity */
554 set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
555 keyout.data = ctx->initiator_integ;
556 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
557 if (err) {
558 dprintk("%s: Error %d deriving initiator_integ key\n",
559 __func__, err);
560 goto out_free_acceptor_enc;
561 }
562
563 /* acceptor seal integrity */
564 set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
565 keyout.data = ctx->acceptor_integ;
566 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
567 if (err) {
568 dprintk("%s: Error %d deriving acceptor_integ key\n",
569 __func__, err);
570 goto out_free_acceptor_enc;
571 }
572
573 switch (ctx->enctype) {
574 case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
575 case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
576 ctx->initiator_enc_aux =
577 context_v2_alloc_cipher(ctx, "cbc(aes)",
578 ctx->initiator_seal);
579 if (ctx->initiator_enc_aux == NULL)
580 goto out_free_acceptor_enc;
581 ctx->acceptor_enc_aux =
582 context_v2_alloc_cipher(ctx, "cbc(aes)",
583 ctx->acceptor_seal);
584 if (ctx->acceptor_enc_aux == NULL) {
585 crypto_free_blkcipher(ctx->initiator_enc_aux);
586 goto out_free_acceptor_enc;
587 }
588 }
589
590 return 0;
591
592 out_free_acceptor_enc:
593 crypto_free_blkcipher(ctx->acceptor_enc);
594 out_free_initiator_enc:
595 crypto_free_blkcipher(ctx->initiator_enc);
596 out_err:
597 return -EINVAL;
598 }
599
600 static int
601 gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx,
602 gfp_t gfp_mask)
603 {
604 int keylen;
605
606 p = simple_get_bytes(p, end, &ctx->flags, sizeof(ctx->flags));
607 if (IS_ERR(p))
608 goto out_err;
609 ctx->initiate = ctx->flags & KRB5_CTX_FLAG_INITIATOR;
610
611 p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
612 if (IS_ERR(p))
613 goto out_err;
614 p = simple_get_bytes(p, end, &ctx->seq_send64, sizeof(ctx->seq_send64));
615 if (IS_ERR(p))
616 goto out_err;
617 /* set seq_send for use by "older" enctypes */
618 ctx->seq_send = ctx->seq_send64;
619 if (ctx->seq_send64 != ctx->seq_send) {
620 dprintk("%s: seq_send64 %lx, seq_send %x overflow?\n", __func__,
621 (long unsigned)ctx->seq_send64, ctx->seq_send);
622 goto out_err;
623 }
624 p = simple_get_bytes(p, end, &ctx->enctype, sizeof(ctx->enctype));
625 if (IS_ERR(p))
626 goto out_err;
627 /* Map ENCTYPE_DES3_CBC_SHA1 to ENCTYPE_DES3_CBC_RAW */
628 if (ctx->enctype == ENCTYPE_DES3_CBC_SHA1)
629 ctx->enctype = ENCTYPE_DES3_CBC_RAW;
630 ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
631 if (ctx->gk5e == NULL) {
632 dprintk("gss_kerberos_mech: unsupported krb5 enctype %u\n",
633 ctx->enctype);
634 p = ERR_PTR(-EINVAL);
635 goto out_err;
636 }
637 keylen = ctx->gk5e->keylength;
638
639 p = simple_get_bytes(p, end, ctx->Ksess, keylen);
640 if (IS_ERR(p))
641 goto out_err;
642
643 if (p != end) {
644 p = ERR_PTR(-EINVAL);
645 goto out_err;
646 }
647
648 ctx->mech_used.data = kmemdup(gss_kerberos_mech.gm_oid.data,
649 gss_kerberos_mech.gm_oid.len, gfp_mask);
650 if (unlikely(ctx->mech_used.data == NULL)) {
651 p = ERR_PTR(-ENOMEM);
652 goto out_err;
653 }
654 ctx->mech_used.len = gss_kerberos_mech.gm_oid.len;
655
656 switch (ctx->enctype) {
657 case ENCTYPE_DES3_CBC_RAW:
658 return context_derive_keys_des3(ctx, gfp_mask);
659 case ENCTYPE_ARCFOUR_HMAC:
660 return context_derive_keys_rc4(ctx);
661 case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
662 case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
663 return context_derive_keys_new(ctx, gfp_mask);
664 default:
665 return -EINVAL;
666 }
667
668 out_err:
669 return PTR_ERR(p);
670 }
671
672 static int
673 gss_import_sec_context_kerberos(const void *p, size_t len,
674 struct gss_ctx *ctx_id,
675 gfp_t gfp_mask)
676 {
677 const void *end = (const void *)((const char *)p + len);
678 struct krb5_ctx *ctx;
679 int ret;
680
681 ctx = kzalloc(sizeof(*ctx), gfp_mask);
682 if (ctx == NULL)
683 return -ENOMEM;
684
685 if (len == 85)
686 ret = gss_import_v1_context(p, end, ctx);
687 else
688 ret = gss_import_v2_context(p, end, ctx, gfp_mask);
689
690 if (ret == 0)
691 ctx_id->internal_ctx_id = ctx;
692 else
693 kfree(ctx);
694
695 dprintk("RPC: %s: returning %d\n", __func__, ret);
696 return ret;
697 }
698
699 static void
700 gss_delete_sec_context_kerberos(void *internal_ctx) {
701 struct krb5_ctx *kctx = internal_ctx;
702
703 crypto_free_blkcipher(kctx->seq);
704 crypto_free_blkcipher(kctx->enc);
705 crypto_free_blkcipher(kctx->acceptor_enc);
706 crypto_free_blkcipher(kctx->initiator_enc);
707 crypto_free_blkcipher(kctx->acceptor_enc_aux);
708 crypto_free_blkcipher(kctx->initiator_enc_aux);
709 kfree(kctx->mech_used.data);
710 kfree(kctx);
711 }
712
713 static const struct gss_api_ops gss_kerberos_ops = {
714 .gss_import_sec_context = gss_import_sec_context_kerberos,
715 .gss_get_mic = gss_get_mic_kerberos,
716 .gss_verify_mic = gss_verify_mic_kerberos,
717 .gss_wrap = gss_wrap_kerberos,
718 .gss_unwrap = gss_unwrap_kerberos,
719 .gss_delete_sec_context = gss_delete_sec_context_kerberos,
720 };
721
722 static struct pf_desc gss_kerberos_pfs[] = {
723 [0] = {
724 .pseudoflavor = RPC_AUTH_GSS_KRB5,
725 .service = RPC_GSS_SVC_NONE,
726 .name = "krb5",
727 },
728 [1] = {
729 .pseudoflavor = RPC_AUTH_GSS_KRB5I,
730 .service = RPC_GSS_SVC_INTEGRITY,
731 .name = "krb5i",
732 },
733 [2] = {
734 .pseudoflavor = RPC_AUTH_GSS_KRB5P,
735 .service = RPC_GSS_SVC_PRIVACY,
736 .name = "krb5p",
737 },
738 };
739
740 static struct gss_api_mech gss_kerberos_mech = {
741 .gm_name = "krb5",
742 .gm_owner = THIS_MODULE,
743 .gm_oid = {9, (void *)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"},
744 .gm_ops = &gss_kerberos_ops,
745 .gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs),
746 .gm_pfs = gss_kerberos_pfs,
747 .gm_upcall_enctypes = "enctypes=18,17,16,23,3,1,2 ",
748 };
749
750 static int __init init_kerberos_module(void)
751 {
752 int status;
753
754 status = gss_mech_register(&gss_kerberos_mech);
755 if (status)
756 printk("Failed to register kerberos gss mechanism!\n");
757 return status;
758 }
759
760 static void __exit cleanup_kerberos_module(void)
761 {
762 gss_mech_unregister(&gss_kerberos_mech);
763 }
764
765 MODULE_LICENSE("GPL");
766 module_init(init_kerberos_module);
767 module_exit(cleanup_kerberos_module);
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