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1// SPDX-License-Identifier: BSD-3-Clause
2/*
3 * linux/net/sunrpc/gss_krb5_mech.c
4 *
5 * Copyright (c) 2001-2008 The Regents of the University of Michigan.
6 * All rights reserved.
7 *
8 * Andy Adamson <andros@umich.edu>
9 * J. Bruce Fields <bfields@umich.edu>
10 */
11
12#include <crypto/hash.h>
13#include <crypto/skcipher.h>
14#include <linux/err.h>
15#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/types.h>
18#include <linux/slab.h>
19#include <linux/sunrpc/auth.h>
20#include <linux/sunrpc/gss_krb5.h>
21#include <linux/sunrpc/xdr.h>
22#include <linux/sunrpc/gss_krb5_enctypes.h>
23
24#include "auth_gss_internal.h"
25
26#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
27# define RPCDBG_FACILITY RPCDBG_AUTH
28#endif
29
30static struct gss_api_mech gss_kerberos_mech; /* forward declaration */
31
32static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = {
33#ifndef CONFIG_SUNRPC_DISABLE_INSECURE_ENCTYPES
34 /*
35 * DES (All DES enctypes are mapped to the same gss functionality)
36 */
37 {
38 .etype = ENCTYPE_DES_CBC_RAW,
39 .ctype = CKSUMTYPE_RSA_MD5,
40 .name = "des-cbc-crc",
41 .encrypt_name = "cbc(des)",
42 .cksum_name = "md5",
43 .encrypt = krb5_encrypt,
44 .decrypt = krb5_decrypt,
45 .mk_key = NULL,
46 .signalg = SGN_ALG_DES_MAC_MD5,
47 .sealalg = SEAL_ALG_DES,
48 .keybytes = 7,
49 .keylength = 8,
50 .blocksize = 8,
51 .conflen = 8,
52 .cksumlength = 8,
53 .keyed_cksum = 0,
54 },
55#endif /* CONFIG_SUNRPC_DISABLE_INSECURE_ENCTYPES */
56 /*
57 * 3DES
58 */
59 {
60 .etype = ENCTYPE_DES3_CBC_RAW,
61 .ctype = CKSUMTYPE_HMAC_SHA1_DES3,
62 .name = "des3-hmac-sha1",
63 .encrypt_name = "cbc(des3_ede)",
64 .cksum_name = "hmac(sha1)",
65 .encrypt = krb5_encrypt,
66 .decrypt = krb5_decrypt,
67 .mk_key = gss_krb5_des3_make_key,
68 .signalg = SGN_ALG_HMAC_SHA1_DES3_KD,
69 .sealalg = SEAL_ALG_DES3KD,
70 .keybytes = 21,
71 .keylength = 24,
72 .blocksize = 8,
73 .conflen = 8,
74 .cksumlength = 20,
75 .keyed_cksum = 1,
76 },
77 /*
78 * AES128
79 */
80 {
81 .etype = ENCTYPE_AES128_CTS_HMAC_SHA1_96,
82 .ctype = CKSUMTYPE_HMAC_SHA1_96_AES128,
83 .name = "aes128-cts",
84 .encrypt_name = "cts(cbc(aes))",
85 .cksum_name = "hmac(sha1)",
86 .encrypt = krb5_encrypt,
87 .decrypt = krb5_decrypt,
88 .mk_key = gss_krb5_aes_make_key,
89 .encrypt_v2 = gss_krb5_aes_encrypt,
90 .decrypt_v2 = gss_krb5_aes_decrypt,
91 .signalg = -1,
92 .sealalg = -1,
93 .keybytes = 16,
94 .keylength = 16,
95 .blocksize = 16,
96 .conflen = 16,
97 .cksumlength = 12,
98 .keyed_cksum = 1,
99 },
100 /*
101 * AES256
102 */
103 {
104 .etype = ENCTYPE_AES256_CTS_HMAC_SHA1_96,
105 .ctype = CKSUMTYPE_HMAC_SHA1_96_AES256,
106 .name = "aes256-cts",
107 .encrypt_name = "cts(cbc(aes))",
108 .cksum_name = "hmac(sha1)",
109 .encrypt = krb5_encrypt,
110 .decrypt = krb5_decrypt,
111 .mk_key = gss_krb5_aes_make_key,
112 .encrypt_v2 = gss_krb5_aes_encrypt,
113 .decrypt_v2 = gss_krb5_aes_decrypt,
114 .signalg = -1,
115 .sealalg = -1,
116 .keybytes = 32,
117 .keylength = 32,
118 .blocksize = 16,
119 .conflen = 16,
120 .cksumlength = 12,
121 .keyed_cksum = 1,
122 },
123};
124
125static const int num_supported_enctypes =
126 ARRAY_SIZE(supported_gss_krb5_enctypes);
127
128static int
129supported_gss_krb5_enctype(int etype)
130{
131 int i;
132 for (i = 0; i < num_supported_enctypes; i++)
133 if (supported_gss_krb5_enctypes[i].etype == etype)
134 return 1;
135 return 0;
136}
137
138static const struct gss_krb5_enctype *
139get_gss_krb5_enctype(int etype)
140{
141 int i;
142 for (i = 0; i < num_supported_enctypes; i++)
143 if (supported_gss_krb5_enctypes[i].etype == etype)
144 return &supported_gss_krb5_enctypes[i];
145 return NULL;
146}
147
148static inline const void *
149get_key(const void *p, const void *end,
150 struct krb5_ctx *ctx, struct crypto_sync_skcipher **res)
151{
152 struct xdr_netobj key;
153 int alg;
154
155 p = simple_get_bytes(p, end, &alg, sizeof(alg));
156 if (IS_ERR(p))
157 goto out_err;
158
159 switch (alg) {
160 case ENCTYPE_DES_CBC_CRC:
161 case ENCTYPE_DES_CBC_MD4:
162 case ENCTYPE_DES_CBC_MD5:
163 /* Map all these key types to ENCTYPE_DES_CBC_RAW */
164 alg = ENCTYPE_DES_CBC_RAW;
165 break;
166 }
167
168 if (!supported_gss_krb5_enctype(alg)) {
169 printk(KERN_WARNING "gss_kerberos_mech: unsupported "
170 "encryption key algorithm %d\n", alg);
171 p = ERR_PTR(-EINVAL);
172 goto out_err;
173 }
174 p = simple_get_netobj(p, end, &key);
175 if (IS_ERR(p))
176 goto out_err;
177
178 *res = crypto_alloc_sync_skcipher(ctx->gk5e->encrypt_name, 0, 0);
179 if (IS_ERR(*res)) {
180 printk(KERN_WARNING "gss_kerberos_mech: unable to initialize "
181 "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
182 *res = NULL;
183 goto out_err_free_key;
184 }
185 if (crypto_sync_skcipher_setkey(*res, key.data, key.len)) {
186 printk(KERN_WARNING "gss_kerberos_mech: error setting key for "
187 "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
188 goto out_err_free_tfm;
189 }
190
191 kfree(key.data);
192 return p;
193
194out_err_free_tfm:
195 crypto_free_sync_skcipher(*res);
196out_err_free_key:
197 kfree(key.data);
198 p = ERR_PTR(-EINVAL);
199out_err:
200 return p;
201}
202
203static int
204gss_import_v1_context(const void *p, const void *end, struct krb5_ctx *ctx)
205{
206 u32 seq_send;
207 int tmp;
208 u32 time32;
209
210 p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate));
211 if (IS_ERR(p))
212 goto out_err;
213
214 /* Old format supports only DES! Any other enctype uses new format */
215 ctx->enctype = ENCTYPE_DES_CBC_RAW;
216
217 ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
218 if (ctx->gk5e == NULL) {
219 p = ERR_PTR(-EINVAL);
220 goto out_err;
221 }
222
223 /* The downcall format was designed before we completely understood
224 * the uses of the context fields; so it includes some stuff we
225 * just give some minimal sanity-checking, and some we ignore
226 * completely (like the next twenty bytes): */
227 if (unlikely(p + 20 > end || p + 20 < p)) {
228 p = ERR_PTR(-EFAULT);
229 goto out_err;
230 }
231 p += 20;
232 p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
233 if (IS_ERR(p))
234 goto out_err;
235 if (tmp != SGN_ALG_DES_MAC_MD5) {
236 p = ERR_PTR(-ENOSYS);
237 goto out_err;
238 }
239 p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
240 if (IS_ERR(p))
241 goto out_err;
242 if (tmp != SEAL_ALG_DES) {
243 p = ERR_PTR(-ENOSYS);
244 goto out_err;
245 }
246 p = simple_get_bytes(p, end, &time32, sizeof(time32));
247 if (IS_ERR(p))
248 goto out_err;
249 /* unsigned 32-bit time overflows in year 2106 */
250 ctx->endtime = (time64_t)time32;
251 p = simple_get_bytes(p, end, &seq_send, sizeof(seq_send));
252 if (IS_ERR(p))
253 goto out_err;
254 atomic_set(&ctx->seq_send, seq_send);
255 p = simple_get_netobj(p, end, &ctx->mech_used);
256 if (IS_ERR(p))
257 goto out_err;
258 p = get_key(p, end, ctx, &ctx->enc);
259 if (IS_ERR(p))
260 goto out_err_free_mech;
261 p = get_key(p, end, ctx, &ctx->seq);
262 if (IS_ERR(p))
263 goto out_err_free_key1;
264 if (p != end) {
265 p = ERR_PTR(-EFAULT);
266 goto out_err_free_key2;
267 }
268
269 return 0;
270
271out_err_free_key2:
272 crypto_free_sync_skcipher(ctx->seq);
273out_err_free_key1:
274 crypto_free_sync_skcipher(ctx->enc);
275out_err_free_mech:
276 kfree(ctx->mech_used.data);
277out_err:
278 return PTR_ERR(p);
279}
280
281static struct crypto_sync_skcipher *
282context_v2_alloc_cipher(struct krb5_ctx *ctx, const char *cname, u8 *key)
283{
284 struct crypto_sync_skcipher *cp;
285
286 cp = crypto_alloc_sync_skcipher(cname, 0, 0);
287 if (IS_ERR(cp)) {
288 dprintk("gss_kerberos_mech: unable to initialize "
289 "crypto algorithm %s\n", cname);
290 return NULL;
291 }
292 if (crypto_sync_skcipher_setkey(cp, key, ctx->gk5e->keylength)) {
293 dprintk("gss_kerberos_mech: error setting key for "
294 "crypto algorithm %s\n", cname);
295 crypto_free_sync_skcipher(cp);
296 return NULL;
297 }
298 return cp;
299}
300
301static inline void
302set_cdata(u8 cdata[GSS_KRB5_K5CLENGTH], u32 usage, u8 seed)
303{
304 cdata[0] = (usage>>24)&0xff;
305 cdata[1] = (usage>>16)&0xff;
306 cdata[2] = (usage>>8)&0xff;
307 cdata[3] = usage&0xff;
308 cdata[4] = seed;
309}
310
311static int
312context_derive_keys_des3(struct krb5_ctx *ctx, gfp_t gfp_mask)
313{
314 struct xdr_netobj c, keyin, keyout;
315 u8 cdata[GSS_KRB5_K5CLENGTH];
316 u32 err;
317
318 c.len = GSS_KRB5_K5CLENGTH;
319 c.data = cdata;
320
321 keyin.data = ctx->Ksess;
322 keyin.len = ctx->gk5e->keylength;
323 keyout.len = ctx->gk5e->keylength;
324
325 /* seq uses the raw key */
326 ctx->seq = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
327 ctx->Ksess);
328 if (ctx->seq == NULL)
329 goto out_err;
330
331 ctx->enc = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
332 ctx->Ksess);
333 if (ctx->enc == NULL)
334 goto out_free_seq;
335
336 /* derive cksum */
337 set_cdata(cdata, KG_USAGE_SIGN, KEY_USAGE_SEED_CHECKSUM);
338 keyout.data = ctx->cksum;
339 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
340 if (err) {
341 dprintk("%s: Error %d deriving cksum key\n",
342 __func__, err);
343 goto out_free_enc;
344 }
345
346 return 0;
347
348out_free_enc:
349 crypto_free_sync_skcipher(ctx->enc);
350out_free_seq:
351 crypto_free_sync_skcipher(ctx->seq);
352out_err:
353 return -EINVAL;
354}
355
356static int
357context_derive_keys_new(struct krb5_ctx *ctx, gfp_t gfp_mask)
358{
359 struct xdr_netobj c, keyin, keyout;
360 u8 cdata[GSS_KRB5_K5CLENGTH];
361 u32 err;
362
363 c.len = GSS_KRB5_K5CLENGTH;
364 c.data = cdata;
365
366 keyin.data = ctx->Ksess;
367 keyin.len = ctx->gk5e->keylength;
368 keyout.len = ctx->gk5e->keylength;
369
370 /* initiator seal encryption */
371 set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
372 keyout.data = ctx->initiator_seal;
373 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
374 if (err) {
375 dprintk("%s: Error %d deriving initiator_seal key\n",
376 __func__, err);
377 goto out_err;
378 }
379 ctx->initiator_enc = context_v2_alloc_cipher(ctx,
380 ctx->gk5e->encrypt_name,
381 ctx->initiator_seal);
382 if (ctx->initiator_enc == NULL)
383 goto out_err;
384
385 /* acceptor seal encryption */
386 set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
387 keyout.data = ctx->acceptor_seal;
388 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
389 if (err) {
390 dprintk("%s: Error %d deriving acceptor_seal key\n",
391 __func__, err);
392 goto out_free_initiator_enc;
393 }
394 ctx->acceptor_enc = context_v2_alloc_cipher(ctx,
395 ctx->gk5e->encrypt_name,
396 ctx->acceptor_seal);
397 if (ctx->acceptor_enc == NULL)
398 goto out_free_initiator_enc;
399
400 /* initiator sign checksum */
401 set_cdata(cdata, KG_USAGE_INITIATOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
402 keyout.data = ctx->initiator_sign;
403 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
404 if (err) {
405 dprintk("%s: Error %d deriving initiator_sign key\n",
406 __func__, err);
407 goto out_free_acceptor_enc;
408 }
409
410 /* acceptor sign checksum */
411 set_cdata(cdata, KG_USAGE_ACCEPTOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
412 keyout.data = ctx->acceptor_sign;
413 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
414 if (err) {
415 dprintk("%s: Error %d deriving acceptor_sign key\n",
416 __func__, err);
417 goto out_free_acceptor_enc;
418 }
419
420 /* initiator seal integrity */
421 set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
422 keyout.data = ctx->initiator_integ;
423 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
424 if (err) {
425 dprintk("%s: Error %d deriving initiator_integ key\n",
426 __func__, err);
427 goto out_free_acceptor_enc;
428 }
429
430 /* acceptor seal integrity */
431 set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
432 keyout.data = ctx->acceptor_integ;
433 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
434 if (err) {
435 dprintk("%s: Error %d deriving acceptor_integ key\n",
436 __func__, err);
437 goto out_free_acceptor_enc;
438 }
439
440 switch (ctx->enctype) {
441 case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
442 case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
443 ctx->initiator_enc_aux =
444 context_v2_alloc_cipher(ctx, "cbc(aes)",
445 ctx->initiator_seal);
446 if (ctx->initiator_enc_aux == NULL)
447 goto out_free_acceptor_enc;
448 ctx->acceptor_enc_aux =
449 context_v2_alloc_cipher(ctx, "cbc(aes)",
450 ctx->acceptor_seal);
451 if (ctx->acceptor_enc_aux == NULL) {
452 crypto_free_sync_skcipher(ctx->initiator_enc_aux);
453 goto out_free_acceptor_enc;
454 }
455 }
456
457 return 0;
458
459out_free_acceptor_enc:
460 crypto_free_sync_skcipher(ctx->acceptor_enc);
461out_free_initiator_enc:
462 crypto_free_sync_skcipher(ctx->initiator_enc);
463out_err:
464 return -EINVAL;
465}
466
467static int
468gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx,
469 gfp_t gfp_mask)
470{
471 u64 seq_send64;
472 int keylen;
473 u32 time32;
474
475 p = simple_get_bytes(p, end, &ctx->flags, sizeof(ctx->flags));
476 if (IS_ERR(p))
477 goto out_err;
478 ctx->initiate = ctx->flags & KRB5_CTX_FLAG_INITIATOR;
479
480 p = simple_get_bytes(p, end, &time32, sizeof(time32));
481 if (IS_ERR(p))
482 goto out_err;
483 /* unsigned 32-bit time overflows in year 2106 */
484 ctx->endtime = (time64_t)time32;
485 p = simple_get_bytes(p, end, &seq_send64, sizeof(seq_send64));
486 if (IS_ERR(p))
487 goto out_err;
488 atomic64_set(&ctx->seq_send64, seq_send64);
489 /* set seq_send for use by "older" enctypes */
490 atomic_set(&ctx->seq_send, seq_send64);
491 if (seq_send64 != atomic_read(&ctx->seq_send)) {
492 dprintk("%s: seq_send64 %llx, seq_send %x overflow?\n", __func__,
493 seq_send64, atomic_read(&ctx->seq_send));
494 p = ERR_PTR(-EINVAL);
495 goto out_err;
496 }
497 p = simple_get_bytes(p, end, &ctx->enctype, sizeof(ctx->enctype));
498 if (IS_ERR(p))
499 goto out_err;
500 /* Map ENCTYPE_DES3_CBC_SHA1 to ENCTYPE_DES3_CBC_RAW */
501 if (ctx->enctype == ENCTYPE_DES3_CBC_SHA1)
502 ctx->enctype = ENCTYPE_DES3_CBC_RAW;
503 ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
504 if (ctx->gk5e == NULL) {
505 dprintk("gss_kerberos_mech: unsupported krb5 enctype %u\n",
506 ctx->enctype);
507 p = ERR_PTR(-EINVAL);
508 goto out_err;
509 }
510 keylen = ctx->gk5e->keylength;
511
512 p = simple_get_bytes(p, end, ctx->Ksess, keylen);
513 if (IS_ERR(p))
514 goto out_err;
515
516 if (p != end) {
517 p = ERR_PTR(-EINVAL);
518 goto out_err;
519 }
520
521 ctx->mech_used.data = kmemdup(gss_kerberos_mech.gm_oid.data,
522 gss_kerberos_mech.gm_oid.len, gfp_mask);
523 if (unlikely(ctx->mech_used.data == NULL)) {
524 p = ERR_PTR(-ENOMEM);
525 goto out_err;
526 }
527 ctx->mech_used.len = gss_kerberos_mech.gm_oid.len;
528
529 switch (ctx->enctype) {
530 case ENCTYPE_DES3_CBC_RAW:
531 return context_derive_keys_des3(ctx, gfp_mask);
532 case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
533 case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
534 return context_derive_keys_new(ctx, gfp_mask);
535 default:
536 return -EINVAL;
537 }
538
539out_err:
540 return PTR_ERR(p);
541}
542
543static int
544gss_import_sec_context_kerberos(const void *p, size_t len,
545 struct gss_ctx *ctx_id,
546 time64_t *endtime,
547 gfp_t gfp_mask)
548{
549 const void *end = (const void *)((const char *)p + len);
550 struct krb5_ctx *ctx;
551 int ret;
552
553 ctx = kzalloc(sizeof(*ctx), gfp_mask);
554 if (ctx == NULL)
555 return -ENOMEM;
556
557 if (len == 85)
558 ret = gss_import_v1_context(p, end, ctx);
559 else
560 ret = gss_import_v2_context(p, end, ctx, gfp_mask);
561
562 if (ret == 0) {
563 ctx_id->internal_ctx_id = ctx;
564 if (endtime)
565 *endtime = ctx->endtime;
566 } else
567 kfree(ctx);
568
569 dprintk("RPC: %s: returning %d\n", __func__, ret);
570 return ret;
571}
572
573static void
574gss_delete_sec_context_kerberos(void *internal_ctx) {
575 struct krb5_ctx *kctx = internal_ctx;
576
577 crypto_free_sync_skcipher(kctx->seq);
578 crypto_free_sync_skcipher(kctx->enc);
579 crypto_free_sync_skcipher(kctx->acceptor_enc);
580 crypto_free_sync_skcipher(kctx->initiator_enc);
581 crypto_free_sync_skcipher(kctx->acceptor_enc_aux);
582 crypto_free_sync_skcipher(kctx->initiator_enc_aux);
583 kfree(kctx->mech_used.data);
584 kfree(kctx);
585}
586
587static const struct gss_api_ops gss_kerberos_ops = {
588 .gss_import_sec_context = gss_import_sec_context_kerberos,
589 .gss_get_mic = gss_get_mic_kerberos,
590 .gss_verify_mic = gss_verify_mic_kerberos,
591 .gss_wrap = gss_wrap_kerberos,
592 .gss_unwrap = gss_unwrap_kerberos,
593 .gss_delete_sec_context = gss_delete_sec_context_kerberos,
594};
595
596static struct pf_desc gss_kerberos_pfs[] = {
597 [0] = {
598 .pseudoflavor = RPC_AUTH_GSS_KRB5,
599 .qop = GSS_C_QOP_DEFAULT,
600 .service = RPC_GSS_SVC_NONE,
601 .name = "krb5",
602 },
603 [1] = {
604 .pseudoflavor = RPC_AUTH_GSS_KRB5I,
605 .qop = GSS_C_QOP_DEFAULT,
606 .service = RPC_GSS_SVC_INTEGRITY,
607 .name = "krb5i",
608 .datatouch = true,
609 },
610 [2] = {
611 .pseudoflavor = RPC_AUTH_GSS_KRB5P,
612 .qop = GSS_C_QOP_DEFAULT,
613 .service = RPC_GSS_SVC_PRIVACY,
614 .name = "krb5p",
615 .datatouch = true,
616 },
617};
618
619MODULE_ALIAS("rpc-auth-gss-krb5");
620MODULE_ALIAS("rpc-auth-gss-krb5i");
621MODULE_ALIAS("rpc-auth-gss-krb5p");
622MODULE_ALIAS("rpc-auth-gss-390003");
623MODULE_ALIAS("rpc-auth-gss-390004");
624MODULE_ALIAS("rpc-auth-gss-390005");
625MODULE_ALIAS("rpc-auth-gss-1.2.840.113554.1.2.2");
626
627static struct gss_api_mech gss_kerberos_mech = {
628 .gm_name = "krb5",
629 .gm_owner = THIS_MODULE,
630 .gm_oid = { 9, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02" },
631 .gm_ops = &gss_kerberos_ops,
632 .gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs),
633 .gm_pfs = gss_kerberos_pfs,
634 .gm_upcall_enctypes = KRB5_SUPPORTED_ENCTYPES,
635};
636
637static int __init init_kerberos_module(void)
638{
639 int status;
640
641 status = gss_mech_register(&gss_kerberos_mech);
642 if (status)
643 printk("Failed to register kerberos gss mechanism!\n");
644 return status;
645}
646
647static void __exit cleanup_kerberos_module(void)
648{
649 gss_mech_unregister(&gss_kerberos_mech);
650}
651
652MODULE_LICENSE("GPL");
653module_init(init_kerberos_module);
654module_exit(cleanup_kerberos_module);
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#include <linux/sunrpc/gss_krb5_enctypes.h>
47
48#ifdef RPC_DEBUG
49# define RPCDBG_FACILITY RPCDBG_AUTH
50#endif
51
52static struct gss_api_mech gss_kerberos_mech; /* forward declaration */
53
54static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = {
55 /*
56 * DES (All DES enctypes are mapped to the same gss functionality)
57 */
58 {
59 .etype = ENCTYPE_DES_CBC_RAW,
60 .ctype = CKSUMTYPE_RSA_MD5,
61 .name = "des-cbc-crc",
62 .encrypt_name = "cbc(des)",
63 .cksum_name = "md5",
64 .encrypt = krb5_encrypt,
65 .decrypt = krb5_decrypt,
66 .mk_key = NULL,
67 .signalg = SGN_ALG_DES_MAC_MD5,
68 .sealalg = SEAL_ALG_DES,
69 .keybytes = 7,
70 .keylength = 8,
71 .blocksize = 8,
72 .conflen = 8,
73 .cksumlength = 8,
74 .keyed_cksum = 0,
75 },
76 /*
77 * RC4-HMAC
78 */
79 {
80 .etype = ENCTYPE_ARCFOUR_HMAC,
81 .ctype = CKSUMTYPE_HMAC_MD5_ARCFOUR,
82 .name = "rc4-hmac",
83 .encrypt_name = "ecb(arc4)",
84 .cksum_name = "hmac(md5)",
85 .encrypt = krb5_encrypt,
86 .decrypt = krb5_decrypt,
87 .mk_key = NULL,
88 .signalg = SGN_ALG_HMAC_MD5,
89 .sealalg = SEAL_ALG_MICROSOFT_RC4,
90 .keybytes = 16,
91 .keylength = 16,
92 .blocksize = 1,
93 .conflen = 8,
94 .cksumlength = 8,
95 .keyed_cksum = 1,
96 },
97 /*
98 * 3DES
99 */
100 {
101 .etype = ENCTYPE_DES3_CBC_RAW,
102 .ctype = CKSUMTYPE_HMAC_SHA1_DES3,
103 .name = "des3-hmac-sha1",
104 .encrypt_name = "cbc(des3_ede)",
105 .cksum_name = "hmac(sha1)",
106 .encrypt = krb5_encrypt,
107 .decrypt = krb5_decrypt,
108 .mk_key = gss_krb5_des3_make_key,
109 .signalg = SGN_ALG_HMAC_SHA1_DES3_KD,
110 .sealalg = SEAL_ALG_DES3KD,
111 .keybytes = 21,
112 .keylength = 24,
113 .blocksize = 8,
114 .conflen = 8,
115 .cksumlength = 20,
116 .keyed_cksum = 1,
117 },
118 /*
119 * AES128
120 */
121 {
122 .etype = ENCTYPE_AES128_CTS_HMAC_SHA1_96,
123 .ctype = CKSUMTYPE_HMAC_SHA1_96_AES128,
124 .name = "aes128-cts",
125 .encrypt_name = "cts(cbc(aes))",
126 .cksum_name = "hmac(sha1)",
127 .encrypt = krb5_encrypt,
128 .decrypt = krb5_decrypt,
129 .mk_key = gss_krb5_aes_make_key,
130 .encrypt_v2 = gss_krb5_aes_encrypt,
131 .decrypt_v2 = gss_krb5_aes_decrypt,
132 .signalg = -1,
133 .sealalg = -1,
134 .keybytes = 16,
135 .keylength = 16,
136 .blocksize = 16,
137 .conflen = 16,
138 .cksumlength = 12,
139 .keyed_cksum = 1,
140 },
141 /*
142 * AES256
143 */
144 {
145 .etype = ENCTYPE_AES256_CTS_HMAC_SHA1_96,
146 .ctype = CKSUMTYPE_HMAC_SHA1_96_AES256,
147 .name = "aes256-cts",
148 .encrypt_name = "cts(cbc(aes))",
149 .cksum_name = "hmac(sha1)",
150 .encrypt = krb5_encrypt,
151 .decrypt = krb5_decrypt,
152 .mk_key = gss_krb5_aes_make_key,
153 .encrypt_v2 = gss_krb5_aes_encrypt,
154 .decrypt_v2 = gss_krb5_aes_decrypt,
155 .signalg = -1,
156 .sealalg = -1,
157 .keybytes = 32,
158 .keylength = 32,
159 .blocksize = 16,
160 .conflen = 16,
161 .cksumlength = 12,
162 .keyed_cksum = 1,
163 },
164};
165
166static const int num_supported_enctypes =
167 ARRAY_SIZE(supported_gss_krb5_enctypes);
168
169static int
170supported_gss_krb5_enctype(int etype)
171{
172 int i;
173 for (i = 0; i < num_supported_enctypes; i++)
174 if (supported_gss_krb5_enctypes[i].etype == etype)
175 return 1;
176 return 0;
177}
178
179static const struct gss_krb5_enctype *
180get_gss_krb5_enctype(int etype)
181{
182 int i;
183 for (i = 0; i < num_supported_enctypes; i++)
184 if (supported_gss_krb5_enctypes[i].etype == etype)
185 return &supported_gss_krb5_enctypes[i];
186 return NULL;
187}
188
189static const void *
190simple_get_bytes(const void *p, const void *end, void *res, int len)
191{
192 const void *q = (const void *)((const char *)p + len);
193 if (unlikely(q > end || q < p))
194 return ERR_PTR(-EFAULT);
195 memcpy(res, p, len);
196 return q;
197}
198
199static const void *
200simple_get_netobj(const void *p, const void *end, struct xdr_netobj *res)
201{
202 const void *q;
203 unsigned int len;
204
205 p = simple_get_bytes(p, end, &len, sizeof(len));
206 if (IS_ERR(p))
207 return p;
208 q = (const void *)((const char *)p + len);
209 if (unlikely(q > end || q < p))
210 return ERR_PTR(-EFAULT);
211 res->data = kmemdup(p, len, GFP_NOFS);
212 if (unlikely(res->data == NULL))
213 return ERR_PTR(-ENOMEM);
214 res->len = len;
215 return q;
216}
217
218static inline const void *
219get_key(const void *p, const void *end,
220 struct krb5_ctx *ctx, struct crypto_blkcipher **res)
221{
222 struct xdr_netobj key;
223 int alg;
224
225 p = simple_get_bytes(p, end, &alg, sizeof(alg));
226 if (IS_ERR(p))
227 goto out_err;
228
229 switch (alg) {
230 case ENCTYPE_DES_CBC_CRC:
231 case ENCTYPE_DES_CBC_MD4:
232 case ENCTYPE_DES_CBC_MD5:
233 /* Map all these key types to ENCTYPE_DES_CBC_RAW */
234 alg = ENCTYPE_DES_CBC_RAW;
235 break;
236 }
237
238 if (!supported_gss_krb5_enctype(alg)) {
239 printk(KERN_WARNING "gss_kerberos_mech: unsupported "
240 "encryption key algorithm %d\n", alg);
241 p = ERR_PTR(-EINVAL);
242 goto out_err;
243 }
244 p = simple_get_netobj(p, end, &key);
245 if (IS_ERR(p))
246 goto out_err;
247
248 *res = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
249 CRYPTO_ALG_ASYNC);
250 if (IS_ERR(*res)) {
251 printk(KERN_WARNING "gss_kerberos_mech: unable to initialize "
252 "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
253 *res = NULL;
254 goto out_err_free_key;
255 }
256 if (crypto_blkcipher_setkey(*res, key.data, key.len)) {
257 printk(KERN_WARNING "gss_kerberos_mech: error setting key for "
258 "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
259 goto out_err_free_tfm;
260 }
261
262 kfree(key.data);
263 return p;
264
265out_err_free_tfm:
266 crypto_free_blkcipher(*res);
267out_err_free_key:
268 kfree(key.data);
269 p = ERR_PTR(-EINVAL);
270out_err:
271 return p;
272}
273
274static int
275gss_import_v1_context(const void *p, const void *end, struct krb5_ctx *ctx)
276{
277 int tmp;
278
279 p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate));
280 if (IS_ERR(p))
281 goto out_err;
282
283 /* Old format supports only DES! Any other enctype uses new format */
284 ctx->enctype = ENCTYPE_DES_CBC_RAW;
285
286 ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
287 if (ctx->gk5e == NULL) {
288 p = ERR_PTR(-EINVAL);
289 goto out_err;
290 }
291
292 /* The downcall format was designed before we completely understood
293 * the uses of the context fields; so it includes some stuff we
294 * just give some minimal sanity-checking, and some we ignore
295 * completely (like the next twenty bytes): */
296 if (unlikely(p + 20 > end || p + 20 < p)) {
297 p = ERR_PTR(-EFAULT);
298 goto out_err;
299 }
300 p += 20;
301 p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
302 if (IS_ERR(p))
303 goto out_err;
304 if (tmp != SGN_ALG_DES_MAC_MD5) {
305 p = ERR_PTR(-ENOSYS);
306 goto out_err;
307 }
308 p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
309 if (IS_ERR(p))
310 goto out_err;
311 if (tmp != SEAL_ALG_DES) {
312 p = ERR_PTR(-ENOSYS);
313 goto out_err;
314 }
315 p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
316 if (IS_ERR(p))
317 goto out_err;
318 p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send));
319 if (IS_ERR(p))
320 goto out_err;
321 p = simple_get_netobj(p, end, &ctx->mech_used);
322 if (IS_ERR(p))
323 goto out_err;
324 p = get_key(p, end, ctx, &ctx->enc);
325 if (IS_ERR(p))
326 goto out_err_free_mech;
327 p = get_key(p, end, ctx, &ctx->seq);
328 if (IS_ERR(p))
329 goto out_err_free_key1;
330 if (p != end) {
331 p = ERR_PTR(-EFAULT);
332 goto out_err_free_key2;
333 }
334
335 return 0;
336
337out_err_free_key2:
338 crypto_free_blkcipher(ctx->seq);
339out_err_free_key1:
340 crypto_free_blkcipher(ctx->enc);
341out_err_free_mech:
342 kfree(ctx->mech_used.data);
343out_err:
344 return PTR_ERR(p);
345}
346
347struct crypto_blkcipher *
348context_v2_alloc_cipher(struct krb5_ctx *ctx, const char *cname, u8 *key)
349{
350 struct crypto_blkcipher *cp;
351
352 cp = crypto_alloc_blkcipher(cname, 0, CRYPTO_ALG_ASYNC);
353 if (IS_ERR(cp)) {
354 dprintk("gss_kerberos_mech: unable to initialize "
355 "crypto algorithm %s\n", cname);
356 return NULL;
357 }
358 if (crypto_blkcipher_setkey(cp, key, ctx->gk5e->keylength)) {
359 dprintk("gss_kerberos_mech: error setting key for "
360 "crypto algorithm %s\n", cname);
361 crypto_free_blkcipher(cp);
362 return NULL;
363 }
364 return cp;
365}
366
367static inline void
368set_cdata(u8 cdata[GSS_KRB5_K5CLENGTH], u32 usage, u8 seed)
369{
370 cdata[0] = (usage>>24)&0xff;
371 cdata[1] = (usage>>16)&0xff;
372 cdata[2] = (usage>>8)&0xff;
373 cdata[3] = usage&0xff;
374 cdata[4] = seed;
375}
376
377static int
378context_derive_keys_des3(struct krb5_ctx *ctx, gfp_t gfp_mask)
379{
380 struct xdr_netobj c, keyin, keyout;
381 u8 cdata[GSS_KRB5_K5CLENGTH];
382 u32 err;
383
384 c.len = GSS_KRB5_K5CLENGTH;
385 c.data = cdata;
386
387 keyin.data = ctx->Ksess;
388 keyin.len = ctx->gk5e->keylength;
389 keyout.len = ctx->gk5e->keylength;
390
391 /* seq uses the raw key */
392 ctx->seq = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
393 ctx->Ksess);
394 if (ctx->seq == NULL)
395 goto out_err;
396
397 ctx->enc = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
398 ctx->Ksess);
399 if (ctx->enc == NULL)
400 goto out_free_seq;
401
402 /* derive cksum */
403 set_cdata(cdata, KG_USAGE_SIGN, KEY_USAGE_SEED_CHECKSUM);
404 keyout.data = ctx->cksum;
405 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
406 if (err) {
407 dprintk("%s: Error %d deriving cksum key\n",
408 __func__, err);
409 goto out_free_enc;
410 }
411
412 return 0;
413
414out_free_enc:
415 crypto_free_blkcipher(ctx->enc);
416out_free_seq:
417 crypto_free_blkcipher(ctx->seq);
418out_err:
419 return -EINVAL;
420}
421
422/*
423 * Note that RC4 depends on deriving keys using the sequence
424 * number or the checksum of a token. Therefore, the final keys
425 * cannot be calculated until the token is being constructed!
426 */
427static int
428context_derive_keys_rc4(struct krb5_ctx *ctx)
429{
430 struct crypto_hash *hmac;
431 char sigkeyconstant[] = "signaturekey";
432 int slen = strlen(sigkeyconstant) + 1; /* include null terminator */
433 struct hash_desc desc;
434 struct scatterlist sg[1];
435 int err;
436
437 dprintk("RPC: %s: entered\n", __func__);
438 /*
439 * derive cksum (aka Ksign) key
440 */
441 hmac = crypto_alloc_hash(ctx->gk5e->cksum_name, 0, CRYPTO_ALG_ASYNC);
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_hash_setkey(hmac, ctx->Ksess, ctx->gk5e->keylength);
450 if (err)
451 goto out_err_free_hmac;
452
453 sg_init_table(sg, 1);
454 sg_set_buf(sg, sigkeyconstant, slen);
455
456 desc.tfm = hmac;
457 desc.flags = 0;
458
459 err = crypto_hash_init(&desc);
460 if (err)
461 goto out_err_free_hmac;
462
463 err = crypto_hash_digest(&desc, sg, slen, ctx->cksum);
464 if (err)
465 goto out_err_free_hmac;
466 /*
467 * allocate hash, and blkciphers for data and seqnum encryption
468 */
469 ctx->enc = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
470 CRYPTO_ALG_ASYNC);
471 if (IS_ERR(ctx->enc)) {
472 err = PTR_ERR(ctx->enc);
473 goto out_err_free_hmac;
474 }
475
476 ctx->seq = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
477 CRYPTO_ALG_ASYNC);
478 if (IS_ERR(ctx->seq)) {
479 crypto_free_blkcipher(ctx->enc);
480 err = PTR_ERR(ctx->seq);
481 goto out_err_free_hmac;
482 }
483
484 dprintk("RPC: %s: returning success\n", __func__);
485
486 err = 0;
487
488out_err_free_hmac:
489 crypto_free_hash(hmac);
490out_err:
491 dprintk("RPC: %s: returning %d\n", __func__, err);
492 return err;
493}
494
495static int
496context_derive_keys_new(struct krb5_ctx *ctx, gfp_t gfp_mask)
497{
498 struct xdr_netobj c, keyin, keyout;
499 u8 cdata[GSS_KRB5_K5CLENGTH];
500 u32 err;
501
502 c.len = GSS_KRB5_K5CLENGTH;
503 c.data = cdata;
504
505 keyin.data = ctx->Ksess;
506 keyin.len = ctx->gk5e->keylength;
507 keyout.len = ctx->gk5e->keylength;
508
509 /* initiator seal encryption */
510 set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
511 keyout.data = ctx->initiator_seal;
512 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
513 if (err) {
514 dprintk("%s: Error %d deriving initiator_seal key\n",
515 __func__, err);
516 goto out_err;
517 }
518 ctx->initiator_enc = context_v2_alloc_cipher(ctx,
519 ctx->gk5e->encrypt_name,
520 ctx->initiator_seal);
521 if (ctx->initiator_enc == NULL)
522 goto out_err;
523
524 /* acceptor seal encryption */
525 set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
526 keyout.data = ctx->acceptor_seal;
527 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
528 if (err) {
529 dprintk("%s: Error %d deriving acceptor_seal key\n",
530 __func__, err);
531 goto out_free_initiator_enc;
532 }
533 ctx->acceptor_enc = context_v2_alloc_cipher(ctx,
534 ctx->gk5e->encrypt_name,
535 ctx->acceptor_seal);
536 if (ctx->acceptor_enc == NULL)
537 goto out_free_initiator_enc;
538
539 /* initiator sign checksum */
540 set_cdata(cdata, KG_USAGE_INITIATOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
541 keyout.data = ctx->initiator_sign;
542 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
543 if (err) {
544 dprintk("%s: Error %d deriving initiator_sign key\n",
545 __func__, err);
546 goto out_free_acceptor_enc;
547 }
548
549 /* acceptor sign checksum */
550 set_cdata(cdata, KG_USAGE_ACCEPTOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
551 keyout.data = ctx->acceptor_sign;
552 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
553 if (err) {
554 dprintk("%s: Error %d deriving acceptor_sign key\n",
555 __func__, err);
556 goto out_free_acceptor_enc;
557 }
558
559 /* initiator seal integrity */
560 set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
561 keyout.data = ctx->initiator_integ;
562 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
563 if (err) {
564 dprintk("%s: Error %d deriving initiator_integ key\n",
565 __func__, err);
566 goto out_free_acceptor_enc;
567 }
568
569 /* acceptor seal integrity */
570 set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
571 keyout.data = ctx->acceptor_integ;
572 err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
573 if (err) {
574 dprintk("%s: Error %d deriving acceptor_integ key\n",
575 __func__, err);
576 goto out_free_acceptor_enc;
577 }
578
579 switch (ctx->enctype) {
580 case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
581 case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
582 ctx->initiator_enc_aux =
583 context_v2_alloc_cipher(ctx, "cbc(aes)",
584 ctx->initiator_seal);
585 if (ctx->initiator_enc_aux == NULL)
586 goto out_free_acceptor_enc;
587 ctx->acceptor_enc_aux =
588 context_v2_alloc_cipher(ctx, "cbc(aes)",
589 ctx->acceptor_seal);
590 if (ctx->acceptor_enc_aux == NULL) {
591 crypto_free_blkcipher(ctx->initiator_enc_aux);
592 goto out_free_acceptor_enc;
593 }
594 }
595
596 return 0;
597
598out_free_acceptor_enc:
599 crypto_free_blkcipher(ctx->acceptor_enc);
600out_free_initiator_enc:
601 crypto_free_blkcipher(ctx->initiator_enc);
602out_err:
603 return -EINVAL;
604}
605
606static int
607gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx,
608 gfp_t gfp_mask)
609{
610 int keylen;
611
612 p = simple_get_bytes(p, end, &ctx->flags, sizeof(ctx->flags));
613 if (IS_ERR(p))
614 goto out_err;
615 ctx->initiate = ctx->flags & KRB5_CTX_FLAG_INITIATOR;
616
617 p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
618 if (IS_ERR(p))
619 goto out_err;
620 p = simple_get_bytes(p, end, &ctx->seq_send64, sizeof(ctx->seq_send64));
621 if (IS_ERR(p))
622 goto out_err;
623 /* set seq_send for use by "older" enctypes */
624 ctx->seq_send = ctx->seq_send64;
625 if (ctx->seq_send64 != ctx->seq_send) {
626 dprintk("%s: seq_send64 %lx, seq_send %x overflow?\n", __func__,
627 (long unsigned)ctx->seq_send64, ctx->seq_send);
628 p = ERR_PTR(-EINVAL);
629 goto out_err;
630 }
631 p = simple_get_bytes(p, end, &ctx->enctype, sizeof(ctx->enctype));
632 if (IS_ERR(p))
633 goto out_err;
634 /* Map ENCTYPE_DES3_CBC_SHA1 to ENCTYPE_DES3_CBC_RAW */
635 if (ctx->enctype == ENCTYPE_DES3_CBC_SHA1)
636 ctx->enctype = ENCTYPE_DES3_CBC_RAW;
637 ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
638 if (ctx->gk5e == NULL) {
639 dprintk("gss_kerberos_mech: unsupported krb5 enctype %u\n",
640 ctx->enctype);
641 p = ERR_PTR(-EINVAL);
642 goto out_err;
643 }
644 keylen = ctx->gk5e->keylength;
645
646 p = simple_get_bytes(p, end, ctx->Ksess, keylen);
647 if (IS_ERR(p))
648 goto out_err;
649
650 if (p != end) {
651 p = ERR_PTR(-EINVAL);
652 goto out_err;
653 }
654
655 ctx->mech_used.data = kmemdup(gss_kerberos_mech.gm_oid.data,
656 gss_kerberos_mech.gm_oid.len, gfp_mask);
657 if (unlikely(ctx->mech_used.data == NULL)) {
658 p = ERR_PTR(-ENOMEM);
659 goto out_err;
660 }
661 ctx->mech_used.len = gss_kerberos_mech.gm_oid.len;
662
663 switch (ctx->enctype) {
664 case ENCTYPE_DES3_CBC_RAW:
665 return context_derive_keys_des3(ctx, gfp_mask);
666 case ENCTYPE_ARCFOUR_HMAC:
667 return context_derive_keys_rc4(ctx);
668 case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
669 case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
670 return context_derive_keys_new(ctx, gfp_mask);
671 default:
672 return -EINVAL;
673 }
674
675out_err:
676 return PTR_ERR(p);
677}
678
679static int
680gss_import_sec_context_kerberos(const void *p, size_t len,
681 struct gss_ctx *ctx_id,
682 gfp_t gfp_mask)
683{
684 const void *end = (const void *)((const char *)p + len);
685 struct krb5_ctx *ctx;
686 int ret;
687
688 ctx = kzalloc(sizeof(*ctx), gfp_mask);
689 if (ctx == NULL)
690 return -ENOMEM;
691
692 if (len == 85)
693 ret = gss_import_v1_context(p, end, ctx);
694 else
695 ret = gss_import_v2_context(p, end, ctx, gfp_mask);
696
697 if (ret == 0)
698 ctx_id->internal_ctx_id = ctx;
699 else
700 kfree(ctx);
701
702 dprintk("RPC: %s: returning %d\n", __func__, ret);
703 return ret;
704}
705
706static void
707gss_delete_sec_context_kerberos(void *internal_ctx) {
708 struct krb5_ctx *kctx = internal_ctx;
709
710 crypto_free_blkcipher(kctx->seq);
711 crypto_free_blkcipher(kctx->enc);
712 crypto_free_blkcipher(kctx->acceptor_enc);
713 crypto_free_blkcipher(kctx->initiator_enc);
714 crypto_free_blkcipher(kctx->acceptor_enc_aux);
715 crypto_free_blkcipher(kctx->initiator_enc_aux);
716 kfree(kctx->mech_used.data);
717 kfree(kctx);
718}
719
720static const struct gss_api_ops gss_kerberos_ops = {
721 .gss_import_sec_context = gss_import_sec_context_kerberos,
722 .gss_get_mic = gss_get_mic_kerberos,
723 .gss_verify_mic = gss_verify_mic_kerberos,
724 .gss_wrap = gss_wrap_kerberos,
725 .gss_unwrap = gss_unwrap_kerberos,
726 .gss_delete_sec_context = gss_delete_sec_context_kerberos,
727};
728
729static struct pf_desc gss_kerberos_pfs[] = {
730 [0] = {
731 .pseudoflavor = RPC_AUTH_GSS_KRB5,
732 .service = RPC_GSS_SVC_NONE,
733 .name = "krb5",
734 },
735 [1] = {
736 .pseudoflavor = RPC_AUTH_GSS_KRB5I,
737 .service = RPC_GSS_SVC_INTEGRITY,
738 .name = "krb5i",
739 },
740 [2] = {
741 .pseudoflavor = RPC_AUTH_GSS_KRB5P,
742 .service = RPC_GSS_SVC_PRIVACY,
743 .name = "krb5p",
744 },
745};
746
747MODULE_ALIAS("rpc-auth-gss-krb5");
748MODULE_ALIAS("rpc-auth-gss-krb5i");
749MODULE_ALIAS("rpc-auth-gss-krb5p");
750MODULE_ALIAS("rpc-auth-gss-390003");
751MODULE_ALIAS("rpc-auth-gss-390004");
752MODULE_ALIAS("rpc-auth-gss-390005");
753
754static struct gss_api_mech gss_kerberos_mech = {
755 .gm_name = "krb5",
756 .gm_owner = THIS_MODULE,
757 .gm_oid = {9, (void *)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"},
758 .gm_ops = &gss_kerberos_ops,
759 .gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs),
760 .gm_pfs = gss_kerberos_pfs,
761 .gm_upcall_enctypes = KRB5_SUPPORTED_ENCTYPES,
762};
763
764static int __init init_kerberos_module(void)
765{
766 int status;
767
768 status = gss_mech_register(&gss_kerberos_mech);
769 if (status)
770 printk("Failed to register kerberos gss mechanism!\n");
771 return status;
772}
773
774static void __exit cleanup_kerberos_module(void)
775{
776 gss_mech_unregister(&gss_kerberos_mech);
777}
778
779MODULE_LICENSE("GPL");
780module_init(init_kerberos_module);
781module_exit(cleanup_kerberos_module);