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 
30 static struct gss_api_mech gss_kerberos_mech;	/* forward declaration */
31 
32 static 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 
125 static const int num_supported_enctypes =
126 	ARRAY_SIZE(supported_gss_krb5_enctypes);
127 
128 static int
supported_gss_krb5_enctype(int etype)129 supported_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 
138 static const struct gss_krb5_enctype *
get_gss_krb5_enctype(int etype)139 get_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 
148 static inline const void *
get_key(const void * p,const void * end,struct krb5_ctx * ctx,struct crypto_sync_skcipher ** res)149 get_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 
194 out_err_free_tfm:
195 	crypto_free_sync_skcipher(*res);
196 out_err_free_key:
197 	kfree(key.data);
198 	p = ERR_PTR(-EINVAL);
199 out_err:
200 	return p;
201 }
202 
203 static int
gss_import_v1_context(const void * p,const void * end,struct krb5_ctx * ctx)204 gss_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 
271 out_err_free_key2:
272 	crypto_free_sync_skcipher(ctx->seq);
273 out_err_free_key1:
274 	crypto_free_sync_skcipher(ctx->enc);
275 out_err_free_mech:
276 	kfree(ctx->mech_used.data);
277 out_err:
278 	return PTR_ERR(p);
279 }
280 
281 static struct crypto_sync_skcipher *
context_v2_alloc_cipher(struct krb5_ctx * ctx,const char * cname,u8 * key)282 context_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 
301 static inline void
set_cdata(u8 cdata[GSS_KRB5_K5CLENGTH],u32 usage,u8 seed)302 set_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 
311 static int
context_derive_keys_des3(struct krb5_ctx * ctx,gfp_t gfp_mask)312 context_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 
348 out_free_enc:
349 	crypto_free_sync_skcipher(ctx->enc);
350 out_free_seq:
351 	crypto_free_sync_skcipher(ctx->seq);
352 out_err:
353 	return -EINVAL;
354 }
355 
356 static int
context_derive_keys_new(struct krb5_ctx * ctx,gfp_t gfp_mask)357 context_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 
459 out_free_acceptor_enc:
460 	crypto_free_sync_skcipher(ctx->acceptor_enc);
461 out_free_initiator_enc:
462 	crypto_free_sync_skcipher(ctx->initiator_enc);
463 out_err:
464 	return -EINVAL;
465 }
466 
467 static int
gss_import_v2_context(const void * p,const void * end,struct krb5_ctx * ctx,gfp_t gfp_mask)468 gss_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 
539 out_err:
540 	return PTR_ERR(p);
541 }
542 
543 static int
gss_import_sec_context_kerberos(const void * p,size_t len,struct gss_ctx * ctx_id,time64_t * endtime,gfp_t gfp_mask)544 gss_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 
573 static void
gss_delete_sec_context_kerberos(void * internal_ctx)574 gss_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 
587 static 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 
596 static 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 
619 MODULE_ALIAS("rpc-auth-gss-krb5");
620 MODULE_ALIAS("rpc-auth-gss-krb5i");
621 MODULE_ALIAS("rpc-auth-gss-krb5p");
622 MODULE_ALIAS("rpc-auth-gss-390003");
623 MODULE_ALIAS("rpc-auth-gss-390004");
624 MODULE_ALIAS("rpc-auth-gss-390005");
625 MODULE_ALIAS("rpc-auth-gss-1.2.840.113554.1.2.2");
626 
627 static 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 
init_kerberos_module(void)637 static 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 
cleanup_kerberos_module(void)647 static void __exit cleanup_kerberos_module(void)
648 {
649 	gss_mech_unregister(&gss_kerberos_mech);
650 }
651 
652 MODULE_LICENSE("GPL");
653 module_init(init_kerberos_module);
654 module_exit(cleanup_kerberos_module);
655