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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);
ce8477e1 240 p = ERR_PTR(-EINVAL);
81d4a433
KC		 241 goto out_err;
242 }
1da177e4
LT		 243 p = simple_get_netobj(p, end, &key);
244 if (IS_ERR(p))
245 goto out_err;
246
81d4a433
KC		 247 *res = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
248 CRYPTO_ALG_ASYNC);
378c6697 249 if (IS_ERR(*res)) {
81d4a433
KC		 250 printk(KERN_WARNING "gss_kerberos_mech: unable to initialize "
251 "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
378c6697 252 *res = NULL;
1da177e4 253 goto out_err_free_key;
9e56904e 254 }
378c6697 255 if (crypto_blkcipher_setkey(*res, key.data, key.len)) {
81d4a433
KC		 256 printk(KERN_WARNING "gss_kerberos_mech: error setting key for "
257 "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
1da177e4 258 goto out_err_free_tfm;
9e56904e 259 }
1da177e4
LT		 260
261 kfree(key.data);
262 return p;
263
264out_err_free_tfm:
378c6697 265 crypto_free_blkcipher(*res);
1da177e4
LT		 266out_err_free_key:
267 kfree(key.data);
268 p = ERR_PTR(-EINVAL);
269out_err:
270 return p;
271}
272
273static int
a8cc1cb7 274gss_import_v1_context(const void *p, const void *end, struct krb5_ctx *ctx)
1da177e4 275{
e678e06b 276 int tmp;
1da177e4 277
1da177e4
LT		 278 p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate));
279 if (IS_ERR(p))
a8cc1cb7
KC		 280 goto out_err;
281
282 /* Old format supports only DES! Any other enctype uses new format */
1ac3719a 283 ctx->enctype = ENCTYPE_DES_CBC_RAW;
a8cc1cb7 284
81d4a433 285 ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
ce8477e1
BN		 286 if (ctx->gk5e == NULL) {
287 p = ERR_PTR(-EINVAL);
81d4a433 288 goto out_err;
ce8477e1 289 }
81d4a433 290
717757ad
BF		 291 /* The downcall format was designed before we completely understood
292 * the uses of the context fields; so it includes some stuff we
293 * just give some minimal sanity-checking, and some we ignore
294 * completely (like the next twenty bytes): */
ce8477e1
BN		 295 if (unlikely(p + 20 > end || p + 20 < p)) {
296 p = ERR_PTR(-EFAULT);
a8cc1cb7 297 goto out_err;
ce8477e1 298 }
717757ad 299 p += 20;
e678e06b 300 p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
1da177e4 301 if (IS_ERR(p))
a8cc1cb7 302 goto out_err;
ef338bee
KC		 303 if (tmp != SGN_ALG_DES_MAC_MD5) {
304 p = ERR_PTR(-ENOSYS);
a8cc1cb7 305 goto out_err;
ef338bee 306 }
d922a84a 307 p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
1da177e4 308 if (IS_ERR(p))
a8cc1cb7 309 goto out_err;
ef338bee
KC		 310 if (tmp != SEAL_ALG_DES) {
311 p = ERR_PTR(-ENOSYS);
a8cc1cb7 312 goto out_err;
ef338bee 313 }
1da177e4
LT		 314 p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
315 if (IS_ERR(p))
a8cc1cb7 316 goto out_err;
1da177e4
LT		 317 p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send));
318 if (IS_ERR(p))
a8cc1cb7 319 goto out_err;
1da177e4
LT		 320 p = simple_get_netobj(p, end, &ctx->mech_used);
321 if (IS_ERR(p))
a8cc1cb7 322 goto out_err;
81d4a433 323 p = get_key(p, end, ctx, &ctx->enc);
1da177e4
LT		 324 if (IS_ERR(p))
325 goto out_err_free_mech;
81d4a433 326 p = get_key(p, end, ctx, &ctx->seq);
1da177e4
LT		 327 if (IS_ERR(p))
328 goto out_err_free_key1;
329 if (p != end) {
330 p = ERR_PTR(-EFAULT);
331 goto out_err_free_key2;
332 }
333
1da177e4
LT		 334 return 0;
335
336out_err_free_key2:
378c6697 337 crypto_free_blkcipher(ctx->seq);
1da177e4 338out_err_free_key1:
378c6697 339 crypto_free_blkcipher(ctx->enc);
1da177e4
LT		 340out_err_free_mech:
341 kfree(ctx->mech_used.data);
1da177e4
LT		 342out_err:
343 return PTR_ERR(p);
344}
345
47d84807 346struct crypto_blkcipher *
934a95aa 347context_v2_alloc_cipher(struct krb5_ctx *ctx, const char *cname, u8 *key)
47d84807
KC		 348{
349 struct crypto_blkcipher *cp;
350
934a95aa 351 cp = crypto_alloc_blkcipher(cname, 0, CRYPTO_ALG_ASYNC);
47d84807
KC		 352 if (IS_ERR(cp)) {
353 dprintk("gss_kerberos_mech: unable to initialize "
934a95aa 354 "crypto algorithm %s\n", cname);
47d84807
KC		 355 return NULL;
356 }
357 if (crypto_blkcipher_setkey(cp, key, ctx->gk5e->keylength)) {
358 dprintk("gss_kerberos_mech: error setting key for "
934a95aa 359 "crypto algorithm %s\n", cname);
47d84807
KC		 360 crypto_free_blkcipher(cp);
361 return NULL;
362 }
363 return cp;
364}
365
366static inline void
367set_cdata(u8 cdata[GSS_KRB5_K5CLENGTH], u32 usage, u8 seed)
368{
369 cdata[0] = (usage>>24)&0xff;
370 cdata[1] = (usage>>16)&0xff;
371 cdata[2] = (usage>>8)&0xff;
372 cdata[3] = usage&0xff;
373 cdata[4] = seed;
374}
375
376static int
1f4c86c0 377context_derive_keys_des3(struct krb5_ctx *ctx, gfp_t gfp_mask)
47d84807
KC		 378{
379 struct xdr_netobj c, keyin, keyout;
380 u8 cdata[GSS_KRB5_K5CLENGTH];
381 u32 err;
382
383 c.len = GSS_KRB5_K5CLENGTH;
384 c.data = cdata;
385
fc263a91
KC		 386 keyin.data = ctx->Ksess;
387 keyin.len = ctx->gk5e->keylength;
388 keyout.len = ctx->gk5e->keylength;
47d84807
KC		 389
390 /* seq uses the raw key */
934a95aa 391 ctx->seq = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
fc263a91 392 ctx->Ksess);
47d84807
KC		 393 if (ctx->seq == NULL)
394 goto out_err;
395
934a95aa 396 ctx->enc = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
fc263a91 397 ctx->Ksess);
47d84807
KC		 398 if (ctx->enc == NULL)
399 goto out_free_seq;
400
401 /* derive cksum */
402 set_cdata(cdata, KG_USAGE_SIGN, KEY_USAGE_SEED_CHECKSUM);
403 keyout.data = ctx->cksum;
1f4c86c0 404 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
47d84807
KC		 405 if (err) {
406 dprintk("%s: Error %d deriving cksum key\n",
407 __func__, err);
408 goto out_free_enc;
409 }
410
411 return 0;
412
413out_free_enc:
414 crypto_free_blkcipher(ctx->enc);
415out_free_seq:
416 crypto_free_blkcipher(ctx->seq);
417out_err:
418 return -EINVAL;
419}
420
fffdaef2
KC		 421/*
422 * Note that RC4 depends on deriving keys using the sequence
423 * number or the checksum of a token. Therefore, the final keys
424 * cannot be calculated until the token is being constructed!
425 */
426static int
427context_derive_keys_rc4(struct krb5_ctx *ctx)
428{
429 struct crypto_hash *hmac;
411b5e05 430 static const char sigkeyconstant[] = "signaturekey";
fffdaef2
KC		 431 int slen = strlen(sigkeyconstant) + 1; /* include null terminator */
432 struct hash_desc desc;
433 struct scatterlist sg[1];
434 int err;
435
436 dprintk("RPC: %s: entered\n", __func__);
437 /*
438 * derive cksum (aka Ksign) key
439 */
440 hmac = crypto_alloc_hash(ctx->gk5e->cksum_name, 0, CRYPTO_ALG_ASYNC);
441 if (IS_ERR(hmac)) {
442 dprintk("%s: error %ld allocating hash '%s'\n",
443 __func__, PTR_ERR(hmac), ctx->gk5e->cksum_name);
444 err = PTR_ERR(hmac);
445 goto out_err;
446 }
447
448 err = crypto_hash_setkey(hmac, ctx->Ksess, ctx->gk5e->keylength);
449 if (err)
450 goto out_err_free_hmac;
451
452 sg_init_table(sg, 1);
453 sg_set_buf(sg, sigkeyconstant, slen);
454
455 desc.tfm = hmac;
456 desc.flags = 0;
457
458 err = crypto_hash_init(&desc);
459 if (err)
460 goto out_err_free_hmac;
461
462 err = crypto_hash_digest(&desc, sg, slen, ctx->cksum);
463 if (err)
464 goto out_err_free_hmac;
465 /*
466 * allocate hash, and blkciphers for data and seqnum encryption
467 */
468 ctx->enc = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
469 CRYPTO_ALG_ASYNC);
470 if (IS_ERR(ctx->enc)) {
471 err = PTR_ERR(ctx->enc);
472 goto out_err_free_hmac;
473 }
474
475 ctx->seq = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
476 CRYPTO_ALG_ASYNC);
477 if (IS_ERR(ctx->seq)) {
478 crypto_free_blkcipher(ctx->enc);
479 err = PTR_ERR(ctx->seq);
480 goto out_err_free_hmac;
481 }
482
483 dprintk("RPC: %s: returning success\n", __func__);
484
485 err = 0;
486
487out_err_free_hmac:
488 crypto_free_hash(hmac);
489out_err:
490 dprintk("RPC: %s: returning %d\n", __func__, err);
491 return err;
492}
493
47d84807 494static int
1f4c86c0 495context_derive_keys_new(struct krb5_ctx *ctx, gfp_t gfp_mask)
47d84807
KC		 496{
497 struct xdr_netobj c, keyin, keyout;
498 u8 cdata[GSS_KRB5_K5CLENGTH];
499 u32 err;
500
501 c.len = GSS_KRB5_K5CLENGTH;
502 c.data = cdata;
503
fc263a91
KC		 504 keyin.data = ctx->Ksess;
505 keyin.len = ctx->gk5e->keylength;
506 keyout.len = ctx->gk5e->keylength;
47d84807
KC		 507
508 /* initiator seal encryption */
509 set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
510 keyout.data = ctx->initiator_seal;
1f4c86c0 511 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
47d84807
KC		 512 if (err) {
513 dprintk("%s: Error %d deriving initiator_seal key\n",
514 __func__, err);
515 goto out_err;
516 }
934a95aa
KC		 517 ctx->initiator_enc = context_v2_alloc_cipher(ctx,
518 ctx->gk5e->encrypt_name,
519 ctx->initiator_seal);
47d84807
KC		 520 if (ctx->initiator_enc == NULL)
521 goto out_err;
522
523 /* acceptor seal encryption */
524 set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
525 keyout.data = ctx->acceptor_seal;
1f4c86c0 526 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
47d84807
KC		 527 if (err) {
528 dprintk("%s: Error %d deriving acceptor_seal key\n",
529 __func__, err);
530 goto out_free_initiator_enc;
531 }
934a95aa
KC		 532 ctx->acceptor_enc = context_v2_alloc_cipher(ctx,
533 ctx->gk5e->encrypt_name,
534 ctx->acceptor_seal);
47d84807
KC		 535 if (ctx->acceptor_enc == NULL)
536 goto out_free_initiator_enc;
537
538 /* initiator sign checksum */
539 set_cdata(cdata, KG_USAGE_INITIATOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
540 keyout.data = ctx->initiator_sign;
1f4c86c0 541 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
47d84807
KC		 542 if (err) {
543 dprintk("%s: Error %d deriving initiator_sign key\n",
544 __func__, err);
545 goto out_free_acceptor_enc;
546 }
547
548 /* acceptor sign checksum */
549 set_cdata(cdata, KG_USAGE_ACCEPTOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
550 keyout.data = ctx->acceptor_sign;
1f4c86c0 551 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
47d84807
KC		 552 if (err) {
553 dprintk("%s: Error %d deriving acceptor_sign key\n",
554 __func__, err);
555 goto out_free_acceptor_enc;
556 }
557
558 /* initiator seal integrity */
559 set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
560 keyout.data = ctx->initiator_integ;
1f4c86c0 561 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
47d84807
KC		 562 if (err) {
563 dprintk("%s: Error %d deriving initiator_integ key\n",
564 __func__, err);
565 goto out_free_acceptor_enc;
566 }
567
568 /* acceptor seal integrity */
569 set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
570 keyout.data = ctx->acceptor_integ;
1f4c86c0 571 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
47d84807
KC		 572 if (err) {
573 dprintk("%s: Error %d deriving acceptor_integ key\n",
574 __func__, err);
575 goto out_free_acceptor_enc;
576 }
577
934a95aa
KC		 578 switch (ctx->enctype) {
579 case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
580 case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
581 ctx->initiator_enc_aux =
582 context_v2_alloc_cipher(ctx, "cbc(aes)",
583 ctx->initiator_seal);
584 if (ctx->initiator_enc_aux == NULL)
585 goto out_free_acceptor_enc;
586 ctx->acceptor_enc_aux =
587 context_v2_alloc_cipher(ctx, "cbc(aes)",
588 ctx->acceptor_seal);
589 if (ctx->acceptor_enc_aux == NULL) {
590 crypto_free_blkcipher(ctx->initiator_enc_aux);
591 goto out_free_acceptor_enc;
592 }
593 }
594
47d84807
KC		 595 return 0;
596
597out_free_acceptor_enc:
598 crypto_free_blkcipher(ctx->acceptor_enc);
599out_free_initiator_enc:
600 crypto_free_blkcipher(ctx->initiator_enc);
601out_err:
602 return -EINVAL;
603}
604
605static int
1f4c86c0
TM		 606gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx,
607 gfp_t gfp_mask)
47d84807 608{
47d84807
KC		 609 int keylen;
610
611 p = simple_get_bytes(p, end, &ctx->flags, sizeof(ctx->flags));
612 if (IS_ERR(p))
613 goto out_err;
614 ctx->initiate = ctx->flags & KRB5_CTX_FLAG_INITIATOR;
615
616 p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
617 if (IS_ERR(p))
618 goto out_err;
619 p = simple_get_bytes(p, end, &ctx->seq_send64, sizeof(ctx->seq_send64));
620 if (IS_ERR(p))
621 goto out_err;
622 /* set seq_send for use by "older" enctypes */
623 ctx->seq_send = ctx->seq_send64;
624 if (ctx->seq_send64 != ctx->seq_send) {
625 dprintk("%s: seq_send64 %lx, seq_send %x overflow?\n", __func__,
626 (long unsigned)ctx->seq_send64, ctx->seq_send);
ce8477e1 627 p = ERR_PTR(-EINVAL);
47d84807
KC		 628 goto out_err;
629 }
630 p = simple_get_bytes(p, end, &ctx->enctype, sizeof(ctx->enctype));
631 if (IS_ERR(p))
632 goto out_err;
958142e9
KC		 633 /* Map ENCTYPE_DES3_CBC_SHA1 to ENCTYPE_DES3_CBC_RAW */
634 if (ctx->enctype == ENCTYPE_DES3_CBC_SHA1)
635 ctx->enctype = ENCTYPE_DES3_CBC_RAW;
47d84807
KC		 636 ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
637 if (ctx->gk5e == NULL) {
638 dprintk("gss_kerberos_mech: unsupported krb5 enctype %u\n",
639 ctx->enctype);
640 p = ERR_PTR(-EINVAL);
641 goto out_err;
642 }
643 keylen = ctx->gk5e->keylength;
644
fc263a91 645 p = simple_get_bytes(p, end, ctx->Ksess, keylen);
47d84807
KC		 646 if (IS_ERR(p))
647 goto out_err;
648
649 if (p != end) {
650 p = ERR_PTR(-EINVAL);
651 goto out_err;
652 }
653
654 ctx->mech_used.data = kmemdup(gss_kerberos_mech.gm_oid.data,
1f4c86c0 655 gss_kerberos_mech.gm_oid.len, gfp_mask);
47d84807
KC		 656 if (unlikely(ctx->mech_used.data == NULL)) {
657 p = ERR_PTR(-ENOMEM);
658 goto out_err;
659 }
660 ctx->mech_used.len = gss_kerberos_mech.gm_oid.len;
661
662 switch (ctx->enctype) {
663 case ENCTYPE_DES3_CBC_RAW:
1f4c86c0 664 return context_derive_keys_des3(ctx, gfp_mask);
fffdaef2
KC		 665 case ENCTYPE_ARCFOUR_HMAC:
666 return context_derive_keys_rc4(ctx);
47d84807
KC		 667 case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
668 case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
1f4c86c0 669 return context_derive_keys_new(ctx, gfp_mask);
47d84807
KC		 670 default:
671 return -EINVAL;
672 }
673
674out_err:
675 return PTR_ERR(p);
676}
677
a8cc1cb7
KC		 678static int
679gss_import_sec_context_kerberos(const void *p, size_t len,
1f4c86c0
TM		 680 struct gss_ctx *ctx_id,
681 gfp_t gfp_mask)
a8cc1cb7
KC		 682{
683 const void *end = (const void *)((const char *)p + len);
684 struct krb5_ctx *ctx;
685 int ret;
686
1f4c86c0 687 ctx = kzalloc(sizeof(*ctx), gfp_mask);
a8cc1cb7
KC		 688 if (ctx == NULL)
689 return -ENOMEM;
690
691 if (len == 85)
692 ret = gss_import_v1_context(p, end, ctx);
693 else
1f4c86c0 694 ret = gss_import_v2_context(p, end, ctx, gfp_mask);
a8cc1cb7
KC		 695
696 if (ret == 0)
697 ctx_id->internal_ctx_id = ctx;
698 else
699 kfree(ctx);
700
701 dprintk("RPC: %s: returning %d\n", __func__, ret);
702 return ret;
703}
704
1da177e4
LT		 705static void
706gss_delete_sec_context_kerberos(void *internal_ctx) {
707 struct krb5_ctx *kctx = internal_ctx;
708
378c6697
HX		 709 crypto_free_blkcipher(kctx->seq);
710 crypto_free_blkcipher(kctx->enc);
47d84807
KC		 711 crypto_free_blkcipher(kctx->acceptor_enc);
712 crypto_free_blkcipher(kctx->initiator_enc);
934a95aa
KC		 713 crypto_free_blkcipher(kctx->acceptor_enc_aux);
714 crypto_free_blkcipher(kctx->initiator_enc_aux);
573dbd95 715 kfree(kctx->mech_used.data);
1da177e4
LT		 716 kfree(kctx);
717}
718
f1c0a861 719static const struct gss_api_ops gss_kerberos_ops = {
1da177e4
LT		 720 .gss_import_sec_context = gss_import_sec_context_kerberos,
721 .gss_get_mic = gss_get_mic_kerberos,
722 .gss_verify_mic = gss_verify_mic_kerberos,
14ae162c
BF		 723 .gss_wrap = gss_wrap_kerberos,
724 .gss_unwrap = gss_unwrap_kerberos,
1da177e4
LT		 725 .gss_delete_sec_context = gss_delete_sec_context_kerberos,
726};
727
728static struct pf_desc gss_kerberos_pfs[] = {
729 [0] = {
730 .pseudoflavor = RPC_AUTH_GSS_KRB5,
731 .service = RPC_GSS_SVC_NONE,
732 .name = "krb5",
733 },
734 [1] = {
735 .pseudoflavor = RPC_AUTH_GSS_KRB5I,
736 .service = RPC_GSS_SVC_INTEGRITY,
737 .name = "krb5i",
738 },
14ae162c
BF		 739 [2] = {
740 .pseudoflavor = RPC_AUTH_GSS_KRB5P,
741 .service = RPC_GSS_SVC_PRIVACY,
742 .name = "krb5p",
743 },
1da177e4
LT		 744};
745
746static struct gss_api_mech gss_kerberos_mech = {
747 .gm_name = "krb5",
748 .gm_owner = THIS_MODULE,
ae4c40b1 749 .gm_oid = {9, (void *)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"},
1da177e4
LT		 750 .gm_ops = &gss_kerberos_ops,
751 .gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs),
752 .gm_pfs = gss_kerberos_pfs,
fc54a0c6 753 .gm_upcall_enctypes = "enctypes=18,17,16,23,3,1,2 ",
1da177e4
LT		 754};
755
756static int __init init_kerberos_module(void)
757{
758 int status;
759
760 status = gss_mech_register(&gss_kerberos_mech);
761 if (status)
762 printk("Failed to register kerberos gss mechanism!\n");
763 return status;
764}
765
766static void __exit cleanup_kerberos_module(void)
767{
768 gss_mech_unregister(&gss_kerberos_mech);
769}
770
771MODULE_LICENSE("GPL");
772module_init(init_kerberos_module);
773module_exit(cleanup_kerberos_module);
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