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1da177e4
LT		 1/*
2 * linux/net/sunrpc/gss_krb5_mech.c
3 *
81d4a433 4 * Copyright (c) 2001-2008 The Regents of the University of Michigan.
1da177e4
LT		 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
378c6697 37#include <linux/err.h>
1da177e4
LT		 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>
1da177e4
LT		 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
47d84807
KC		 51static struct gss_api_mech gss_kerberos_mech; /* forward declaration */
52
81d4a433
KC		 53static 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,
4891f2d0 65 .mk_key = NULL,
81d4a433
KC		 66 .signalg = SGN_ALG_DES_MAC_MD5,
67 .sealalg = SEAL_ALG_DES,
68 .keybytes = 7,
69 .keylength = 8,
70 .blocksize = 8,
5af46547 71 .conflen = 8,
81d4a433 72 .cksumlength = 8,
e1f6c07b 73 .keyed_cksum = 0,
81d4a433 74 },
fffdaef2
KC		 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 },
958142e9
KC		 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,
5af46547 113 .conflen = 8,
958142e9
KC		 114 .cksumlength = 20,
115 .keyed_cksum = 1,
116 },
934a95aa
KC		 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,
5af46547 136 .conflen = 16,
934a95aa
KC		 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,
5af46547 159 .conflen = 16,
934a95aa
KC		 160 .cksumlength = 12,
161 .keyed_cksum = 1,
162 },
81d4a433
KC		 163};
164
165static const int num_supported_enctypes =
166 ARRAY_SIZE(supported_gss_krb5_enctypes);
167
168static int
169supported_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
178static const struct gss_krb5_enctype *
179get_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
1da177e4
LT		 188static const void *
189simple_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
198static const void *
199simple_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);
0f38b873 210 res->data = kmemdup(p, len, GFP_NOFS);
1da177e4
LT		 211 if (unlikely(res->data == NULL))
212 return ERR_PTR(-ENOMEM);
1da177e4
LT		 213 res->len = len;
214 return q;
215}
216
217static inline const void *
81d4a433
KC		 218get_key(const void *p, const void *end,
219 struct krb5_ctx *ctx, struct crypto_blkcipher **res)
1da177e4
LT		 220{
221 struct xdr_netobj key;
378c6697 222 int alg;
1da177e4
LT		 223
224 p = simple_get_bytes(p, end, &alg, sizeof(alg));
225 if (IS_ERR(p))
226 goto out_err;
81d4a433
KC		 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 }
1da177e4
LT		 242 p = simple_get_netobj(p, end, &key);
243 if (IS_ERR(p))
244 goto out_err;
245
81d4a433
KC		 246 *res = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
247 CRYPTO_ALG_ASYNC);
378c6697 248 if (IS_ERR(*res)) {
81d4a433
KC		 249 printk(KERN_WARNING "gss_kerberos_mech: unable to initialize "
250 "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
378c6697 251 *res = NULL;
1da177e4 252 goto out_err_free_key;
9e56904e 253 }
378c6697 254 if (crypto_blkcipher_setkey(*res, key.data, key.len)) {
81d4a433
KC		 255 printk(KERN_WARNING "gss_kerberos_mech: error setting key for "
256 "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
1da177e4 257 goto out_err_free_tfm;
9e56904e 258 }
1da177e4
LT		 259
260 kfree(key.data);
261 return p;
262
263out_err_free_tfm:
378c6697 264 crypto_free_blkcipher(*res);
1da177e4
LT		 265out_err_free_key:
266 kfree(key.data);
267 p = ERR_PTR(-EINVAL);
268out_err:
269 return p;
270}
271
272static int
a8cc1cb7 273gss_import_v1_context(const void *p, const void *end, struct krb5_ctx *ctx)
1da177e4 274{
e678e06b 275 int tmp;
1da177e4 276
1da177e4
LT		 277 p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate));
278 if (IS_ERR(p))
a8cc1cb7
KC		 279 goto out_err;
280
281 /* Old format supports only DES! Any other enctype uses new format */
1ac3719a 282 ctx->enctype = ENCTYPE_DES_CBC_RAW;
a8cc1cb7 283
81d4a433
KC		 284 ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
285 if (ctx->gk5e == NULL)
286 goto out_err;
287
717757ad
BF		 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))
a8cc1cb7 293 goto out_err;
717757ad 294 p += 20;
e678e06b 295 p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
1da177e4 296 if (IS_ERR(p))
a8cc1cb7 297 goto out_err;
ef338bee
KC		 298 if (tmp != SGN_ALG_DES_MAC_MD5) {
299 p = ERR_PTR(-ENOSYS);
a8cc1cb7 300 goto out_err;
ef338bee 301 }
d922a84a 302 p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
1da177e4 303 if (IS_ERR(p))
a8cc1cb7 304 goto out_err;
ef338bee
KC		 305 if (tmp != SEAL_ALG_DES) {
306 p = ERR_PTR(-ENOSYS);
a8cc1cb7 307 goto out_err;
ef338bee 308 }
1da177e4
LT		 309 p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
310 if (IS_ERR(p))
a8cc1cb7 311 goto out_err;
1da177e4
LT		 312 p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send));
313 if (IS_ERR(p))
a8cc1cb7 314 goto out_err;
1da177e4
LT		 315 p = simple_get_netobj(p, end, &ctx->mech_used);
316 if (IS_ERR(p))
a8cc1cb7 317 goto out_err;
81d4a433 318 p = get_key(p, end, ctx, &ctx->enc);
1da177e4
LT		 319 if (IS_ERR(p))
320 goto out_err_free_mech;
81d4a433 321 p = get_key(p, end, ctx, &ctx->seq);
1da177e4
LT		 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
1da177e4
LT		 329 return 0;
330
331out_err_free_key2:
378c6697 332 crypto_free_blkcipher(ctx->seq);
1da177e4 333out_err_free_key1:
378c6697 334 crypto_free_blkcipher(ctx->enc);
1da177e4
LT		 335out_err_free_mech:
336 kfree(ctx->mech_used.data);
1da177e4
LT		 337out_err:
338 return PTR_ERR(p);
339}
340
47d84807 341struct crypto_blkcipher *
934a95aa 342context_v2_alloc_cipher(struct krb5_ctx *ctx, const char *cname, u8 *key)
47d84807
KC		 343{
344 struct crypto_blkcipher *cp;
345
934a95aa 346 cp = crypto_alloc_blkcipher(cname, 0, CRYPTO_ALG_ASYNC);
47d84807
KC		 347 if (IS_ERR(cp)) {
348 dprintk("gss_kerberos_mech: unable to initialize "
934a95aa 349 "crypto algorithm %s\n", cname);
47d84807
KC		 350 return NULL;
351 }
352 if (crypto_blkcipher_setkey(cp, key, ctx->gk5e->keylength)) {
353 dprintk("gss_kerberos_mech: error setting key for "
934a95aa 354 "crypto algorithm %s\n", cname);
47d84807
KC		 355 crypto_free_blkcipher(cp);
356 return NULL;
357 }
358 return cp;
359}
360
361static inline void
362set_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
371static int
1f4c86c0 372context_derive_keys_des3(struct krb5_ctx *ctx, gfp_t gfp_mask)
47d84807
KC		 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
fc263a91
KC		 381 keyin.data = ctx->Ksess;
382 keyin.len = ctx->gk5e->keylength;
383 keyout.len = ctx->gk5e->keylength;
47d84807
KC		 384
385 /* seq uses the raw key */
934a95aa 386 ctx->seq = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
fc263a91 387 ctx->Ksess);
47d84807
KC		 388 if (ctx->seq == NULL)
389 goto out_err;
390
934a95aa 391 ctx->enc = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
fc263a91 392 ctx->Ksess);
47d84807
KC		 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;
1f4c86c0 399 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
47d84807
KC		 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
408out_free_enc:
409 crypto_free_blkcipher(ctx->enc);
410out_free_seq:
411 crypto_free_blkcipher(ctx->seq);
412out_err:
413 return -EINVAL;
414}
415
fffdaef2
KC		 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 */
421static int
422context_derive_keys_rc4(struct krb5_ctx *ctx)
423{
424 struct crypto_hash *hmac;
411b5e05 425 static const char sigkeyconstant[] = "signaturekey";
fffdaef2
KC		 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
482out_err_free_hmac:
483 crypto_free_hash(hmac);
484out_err:
485 dprintk("RPC: %s: returning %d\n", __func__, err);
486 return err;
487}
488
47d84807 489static int
1f4c86c0 490context_derive_keys_new(struct krb5_ctx *ctx, gfp_t gfp_mask)
47d84807
KC		 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
fc263a91
KC		 499 keyin.data = ctx->Ksess;
500 keyin.len = ctx->gk5e->keylength;
501 keyout.len = ctx->gk5e->keylength;
47d84807
KC		 502
503 /* initiator seal encryption */
504 set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
505 keyout.data = ctx->initiator_seal;
1f4c86c0 506 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
47d84807
KC		 507 if (err) {
508 dprintk("%s: Error %d deriving initiator_seal key\n",
509 __func__, err);
510 goto out_err;
511 }
934a95aa
KC		 512 ctx->initiator_enc = context_v2_alloc_cipher(ctx,
513 ctx->gk5e->encrypt_name,
514 ctx->initiator_seal);
47d84807
KC		 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;
1f4c86c0 521 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
47d84807
KC		 522 if (err) {
523 dprintk("%s: Error %d deriving acceptor_seal key\n",
524 __func__, err);
525 goto out_free_initiator_enc;
526 }
934a95aa
KC		 527 ctx->acceptor_enc = context_v2_alloc_cipher(ctx,
528 ctx->gk5e->encrypt_name,
529 ctx->acceptor_seal);
47d84807
KC		 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;
1f4c86c0 536 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
47d84807
KC		 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;
1f4c86c0 546 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
47d84807
KC		 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;
1f4c86c0 556 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
47d84807
KC		 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;
1f4c86c0 566 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
47d84807
KC		 567 if (err) {
568 dprintk("%s: Error %d deriving acceptor_integ key\n",
569 __func__, err);
570 goto out_free_acceptor_enc;
571 }
572
934a95aa
KC		 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
47d84807
KC		 590 return 0;
591
592out_free_acceptor_enc:
593 crypto_free_blkcipher(ctx->acceptor_enc);
594out_free_initiator_enc:
595 crypto_free_blkcipher(ctx->initiator_enc);
596out_err:
597 return -EINVAL;
598}
599
600static int
1f4c86c0
TM		 601gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx,
602 gfp_t gfp_mask)
47d84807 603{
47d84807
KC		 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;
958142e9
KC		 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;
47d84807
KC		 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
fc263a91 639 p = simple_get_bytes(p, end, ctx->Ksess, keylen);
47d84807
KC		 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,
1f4c86c0 649 gss_kerberos_mech.gm_oid.len, gfp_mask);
47d84807
KC		 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:
1f4c86c0 658 return context_derive_keys_des3(ctx, gfp_mask);
fffdaef2
KC		 659 case ENCTYPE_ARCFOUR_HMAC:
660 return context_derive_keys_rc4(ctx);
47d84807
KC		 661 case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
662 case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
1f4c86c0 663 return context_derive_keys_new(ctx, gfp_mask);
47d84807
KC		 664 default:
665 return -EINVAL;
666 }
667
668out_err:
669 return PTR_ERR(p);
670}
671
a8cc1cb7
KC		 672static int
673gss_import_sec_context_kerberos(const void *p, size_t len,
1f4c86c0
TM		 674 struct gss_ctx *ctx_id,
675 gfp_t gfp_mask)
a8cc1cb7
KC		 676{
677 const void *end = (const void *)((const char *)p + len);
678 struct krb5_ctx *ctx;
679 int ret;
680
1f4c86c0 681 ctx = kzalloc(sizeof(*ctx), gfp_mask);
a8cc1cb7
KC		 682 if (ctx == NULL)
683 return -ENOMEM;
684
685 if (len == 85)
686 ret = gss_import_v1_context(p, end, ctx);
687 else
1f4c86c0 688 ret = gss_import_v2_context(p, end, ctx, gfp_mask);
a8cc1cb7
KC		 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
1da177e4
LT		 699static void
700gss_delete_sec_context_kerberos(void *internal_ctx) {
701 struct krb5_ctx *kctx = internal_ctx;
702
378c6697
HX		 703 crypto_free_blkcipher(kctx->seq);
704 crypto_free_blkcipher(kctx->enc);
47d84807
KC		 705 crypto_free_blkcipher(kctx->acceptor_enc);
706 crypto_free_blkcipher(kctx->initiator_enc);
934a95aa
KC		 707 crypto_free_blkcipher(kctx->acceptor_enc_aux);
708 crypto_free_blkcipher(kctx->initiator_enc_aux);
573dbd95 709 kfree(kctx->mech_used.data);
1da177e4
LT		 710 kfree(kctx);
711}
712
f1c0a861 713static const struct gss_api_ops gss_kerberos_ops = {
1da177e4
LT		 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,
14ae162c
BF		 717 .gss_wrap = gss_wrap_kerberos,
718 .gss_unwrap = gss_unwrap_kerberos,
1da177e4
LT		 719 .gss_delete_sec_context = gss_delete_sec_context_kerberos,
720};
721
722static 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 },
14ae162c
BF		 733 [2] = {
734 .pseudoflavor = RPC_AUTH_GSS_KRB5P,
735 .service = RPC_GSS_SVC_PRIVACY,
736 .name = "krb5p",
737 },
1da177e4
LT		 738};
739
740static struct gss_api_mech gss_kerberos_mech = {
741 .gm_name = "krb5",
742 .gm_owner = THIS_MODULE,
ae4c40b1 743 .gm_oid = {9, (void *)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"},
1da177e4
LT		 744 .gm_ops = &gss_kerberos_ops,
745 .gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs),
746 .gm_pfs = gss_kerberos_pfs,
fc54a0c6 747 .gm_upcall_enctypes = "enctypes=18,17,16,23,3,1,2 ",
1da177e4
LT		 748};
749
750static 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
760static void __exit cleanup_kerberos_module(void)
761{
762 gss_mech_unregister(&gss_kerberos_mech);
763}
764
765MODULE_LICENSE("GPL");
766module_init(init_kerberos_module);
767module_exit(cleanup_kerberos_module);
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