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Linux 4.19.133
[linux/fpc-iii.git] / net / sunrpc / auth_gss / gss_krb5_mech.c
blob7bb2514aadd9d888469eef0687097e2f5c2ea1e2
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), GFP_NOFS);
455 if (!desc) {
456 dprintk("%s: failed to allocate hash descriptor for '%s'\n",
457 __func__, ctx->gk5e->cksum_name);
458 err = -ENOMEM;
459 goto out_err_free_hmac;
460 }
461
462 desc->tfm = hmac;
463 desc->flags = 0;
464
465 err = crypto_shash_digest(desc, sigkeyconstant, slen, ctx->cksum);
466 kzfree(desc);
467 if (err)
468 goto out_err_free_hmac;
469 /*
470 * allocate hash, and skciphers for data and seqnum encryption
471 */
472 ctx->enc = crypto_alloc_skcipher(ctx->gk5e->encrypt_name, 0,
473 CRYPTO_ALG_ASYNC);
474 if (IS_ERR(ctx->enc)) {
475 err = PTR_ERR(ctx->enc);
476 goto out_err_free_hmac;
477 }
478
479 ctx->seq = crypto_alloc_skcipher(ctx->gk5e->encrypt_name, 0,
480 CRYPTO_ALG_ASYNC);
481 if (IS_ERR(ctx->seq)) {
482 crypto_free_skcipher(ctx->enc);
483 err = PTR_ERR(ctx->seq);
484 goto out_err_free_hmac;
485 }
486
487 dprintk("RPC: %s: returning success\n", __func__);
488
489 err = 0;
490
491 out_err_free_hmac:
492 crypto_free_shash(hmac);
493 out_err:
494 dprintk("RPC: %s: returning %d\n", __func__, err);
495 return err;
496 }
497
498 static int
499 context_derive_keys_new(struct krb5_ctx *ctx, gfp_t gfp_mask)
500 {
501 struct xdr_netobj c, keyin, keyout;
502 u8 cdata[GSS_KRB5_K5CLENGTH];
503 u32 err;
504
505 c.len = GSS_KRB5_K5CLENGTH;
506 c.data = cdata;
507
508 keyin.data = ctx->Ksess;
509 keyin.len = ctx->gk5e->keylength;
510 keyout.len = ctx->gk5e->keylength;
511
512 /* initiator seal encryption */
513 set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
514 keyout.data = ctx->initiator_seal;
515 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
516 if (err) {
517 dprintk("%s: Error %d deriving initiator_seal key\n",
518 __func__, err);
519 goto out_err;
520 }
521 ctx->initiator_enc = context_v2_alloc_cipher(ctx,
522 ctx->gk5e->encrypt_name,
523 ctx->initiator_seal);
524 if (ctx->initiator_enc == NULL)
525 goto out_err;
526
527 /* acceptor seal encryption */
528 set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
529 keyout.data = ctx->acceptor_seal;
530 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
531 if (err) {
532 dprintk("%s: Error %d deriving acceptor_seal key\n",
533 __func__, err);
534 goto out_free_initiator_enc;
535 }
536 ctx->acceptor_enc = context_v2_alloc_cipher(ctx,
537 ctx->gk5e->encrypt_name,
538 ctx->acceptor_seal);
539 if (ctx->acceptor_enc == NULL)
540 goto out_free_initiator_enc;
541
542 /* initiator sign checksum */
543 set_cdata(cdata, KG_USAGE_INITIATOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
544 keyout.data = ctx->initiator_sign;
545 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
546 if (err) {
547 dprintk("%s: Error %d deriving initiator_sign key\n",
548 __func__, err);
549 goto out_free_acceptor_enc;
550 }
551
552 /* acceptor sign checksum */
553 set_cdata(cdata, KG_USAGE_ACCEPTOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
554 keyout.data = ctx->acceptor_sign;
555 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
556 if (err) {
557 dprintk("%s: Error %d deriving acceptor_sign key\n",
558 __func__, err);
559 goto out_free_acceptor_enc;
560 }
561
562 /* initiator seal integrity */
563 set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
564 keyout.data = ctx->initiator_integ;
565 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
566 if (err) {
567 dprintk("%s: Error %d deriving initiator_integ key\n",
568 __func__, err);
569 goto out_free_acceptor_enc;
570 }
571
572 /* acceptor seal integrity */
573 set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
574 keyout.data = ctx->acceptor_integ;
575 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
576 if (err) {
577 dprintk("%s: Error %d deriving acceptor_integ key\n",
578 __func__, err);
579 goto out_free_acceptor_enc;
580 }
581
582 switch (ctx->enctype) {
583 case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
584 case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
585 ctx->initiator_enc_aux =
586 context_v2_alloc_cipher(ctx, "cbc(aes)",
587 ctx->initiator_seal);
588 if (ctx->initiator_enc_aux == NULL)
589 goto out_free_acceptor_enc;
590 ctx->acceptor_enc_aux =
591 context_v2_alloc_cipher(ctx, "cbc(aes)",
592 ctx->acceptor_seal);
593 if (ctx->acceptor_enc_aux == NULL) {
594 crypto_free_skcipher(ctx->initiator_enc_aux);
595 goto out_free_acceptor_enc;
596 }
597 }
598
599 return 0;
600
601 out_free_acceptor_enc:
602 crypto_free_skcipher(ctx->acceptor_enc);
603 out_free_initiator_enc:
604 crypto_free_skcipher(ctx->initiator_enc);
605 out_err:
606 return -EINVAL;
607 }
608
609 static int
610 gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx,
611 gfp_t gfp_mask)
612 {
613 int keylen;
614
615 p = simple_get_bytes(p, end, &ctx->flags, sizeof(ctx->flags));
616 if (IS_ERR(p))
617 goto out_err;
618 ctx->initiate = ctx->flags & KRB5_CTX_FLAG_INITIATOR;
619
620 p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
621 if (IS_ERR(p))
622 goto out_err;
623 p = simple_get_bytes(p, end, &ctx->seq_send64, sizeof(ctx->seq_send64));
624 if (IS_ERR(p))
625 goto out_err;
626 /* set seq_send for use by "older" enctypes */
627 ctx->seq_send = ctx->seq_send64;
628 if (ctx->seq_send64 != ctx->seq_send) {
629 dprintk("%s: seq_send64 %lx, seq_send %x overflow?\n", __func__,
630 (unsigned long)ctx->seq_send64, ctx->seq_send);
631 p = ERR_PTR(-EINVAL);
632 goto out_err;
633 }
634 p = simple_get_bytes(p, end, &ctx->enctype, sizeof(ctx->enctype));
635 if (IS_ERR(p))
636 goto out_err;
637 /* Map ENCTYPE_DES3_CBC_SHA1 to ENCTYPE_DES3_CBC_RAW */
638 if (ctx->enctype == ENCTYPE_DES3_CBC_SHA1)
639 ctx->enctype = ENCTYPE_DES3_CBC_RAW;
640 ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
641 if (ctx->gk5e == NULL) {
642 dprintk("gss_kerberos_mech: unsupported krb5 enctype %u\n",
643 ctx->enctype);
644 p = ERR_PTR(-EINVAL);
645 goto out_err;
646 }
647 keylen = ctx->gk5e->keylength;
648
649 p = simple_get_bytes(p, end, ctx->Ksess, keylen);
650 if (IS_ERR(p))
651 goto out_err;
652
653 if (p != end) {
654 p = ERR_PTR(-EINVAL);
655 goto out_err;
656 }
657
658 ctx->mech_used.data = kmemdup(gss_kerberos_mech.gm_oid.data,
659 gss_kerberos_mech.gm_oid.len, gfp_mask);
660 if (unlikely(ctx->mech_used.data == NULL)) {
661 p = ERR_PTR(-ENOMEM);
662 goto out_err;
663 }
664 ctx->mech_used.len = gss_kerberos_mech.gm_oid.len;
665
666 switch (ctx->enctype) {
667 case ENCTYPE_DES3_CBC_RAW:
668 return context_derive_keys_des3(ctx, gfp_mask);
669 case ENCTYPE_ARCFOUR_HMAC:
670 return context_derive_keys_rc4(ctx);
671 case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
672 case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
673 return context_derive_keys_new(ctx, gfp_mask);
674 default:
675 return -EINVAL;
676 }
677
678 out_err:
679 return PTR_ERR(p);
680 }
681
682 static int
683 gss_import_sec_context_kerberos(const void *p, size_t len,
684 struct gss_ctx *ctx_id,
685 time_t *endtime,
686 gfp_t gfp_mask)
687 {
688 const void *end = (const void *)((const char *)p + len);
689 struct krb5_ctx *ctx;
690 int ret;
691
692 ctx = kzalloc(sizeof(*ctx), gfp_mask);
693 if (ctx == NULL)
694 return -ENOMEM;
695
696 if (len == 85)
697 ret = gss_import_v1_context(p, end, ctx);
698 else
699 ret = gss_import_v2_context(p, end, ctx, gfp_mask);
700
701 if (ret == 0) {
702 ctx_id->internal_ctx_id = ctx;
703 if (endtime)
704 *endtime = ctx->endtime;
705 } else
706 kfree(ctx);
707
708 dprintk("RPC: %s: returning %d\n", __func__, ret);
709 return ret;
710 }
711
712 static void
713 gss_delete_sec_context_kerberos(void *internal_ctx) {
714 struct krb5_ctx *kctx = internal_ctx;
715
716 crypto_free_skcipher(kctx->seq);
717 crypto_free_skcipher(kctx->enc);
718 crypto_free_skcipher(kctx->acceptor_enc);
719 crypto_free_skcipher(kctx->initiator_enc);
720 crypto_free_skcipher(kctx->acceptor_enc_aux);
721 crypto_free_skcipher(kctx->initiator_enc_aux);
722 kfree(kctx->mech_used.data);
723 kfree(kctx);
724 }
725
726 static const struct gss_api_ops gss_kerberos_ops = {
727 .gss_import_sec_context = gss_import_sec_context_kerberos,
728 .gss_get_mic = gss_get_mic_kerberos,
729 .gss_verify_mic = gss_verify_mic_kerberos,
730 .gss_wrap = gss_wrap_kerberos,
731 .gss_unwrap = gss_unwrap_kerberos,
732 .gss_delete_sec_context = gss_delete_sec_context_kerberos,
733 };
734
735 static struct pf_desc gss_kerberos_pfs[] = {
736 [0] = {
737 .pseudoflavor = RPC_AUTH_GSS_KRB5,
738 .qop = GSS_C_QOP_DEFAULT,
739 .service = RPC_GSS_SVC_NONE,
740 .name = "krb5",
741 },
742 [1] = {
743 .pseudoflavor = RPC_AUTH_GSS_KRB5I,
744 .qop = GSS_C_QOP_DEFAULT,
745 .service = RPC_GSS_SVC_INTEGRITY,
746 .name = "krb5i",
747 .datatouch = true,
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 .datatouch = true,
755 },
756 };
757
758 MODULE_ALIAS("rpc-auth-gss-krb5");
759 MODULE_ALIAS("rpc-auth-gss-krb5i");
760 MODULE_ALIAS("rpc-auth-gss-krb5p");
761 MODULE_ALIAS("rpc-auth-gss-390003");
762 MODULE_ALIAS("rpc-auth-gss-390004");
763 MODULE_ALIAS("rpc-auth-gss-390005");
764 MODULE_ALIAS("rpc-auth-gss-1.2.840.113554.1.2.2");
765
766 static struct gss_api_mech gss_kerberos_mech = {
767 .gm_name = "krb5",
768 .gm_owner = THIS_MODULE,
769 .gm_oid = { 9, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02" },
770 .gm_ops = &gss_kerberos_ops,
771 .gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs),
772 .gm_pfs = gss_kerberos_pfs,
773 .gm_upcall_enctypes = KRB5_SUPPORTED_ENCTYPES,
774 };
775
776 static int __init init_kerberos_module(void)
777 {
778 int status;
779
780 status = gss_mech_register(&gss_kerberos_mech);
781 if (status)
782 printk("Failed to register kerberos gss mechanism!\n");
783 return status;
784 }
785
786 static void __exit cleanup_kerberos_module(void)
787 {
788 gss_mech_unregister(&gss_kerberos_mech);
789 }
790
791 MODULE_LICENSE("GPL");
792 module_init(init_kerberos_module);
793 module_exit(cleanup_kerberos_module);
Linux with added FPC-III support