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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 <kunit/visibility.h>
23
24#include "auth_gss_internal.h"
25#include "gss_krb5_internal.h"
26
27#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
28# define RPCDBG_FACILITY RPCDBG_AUTH
29#endif
30
31static struct gss_api_mech gss_kerberos_mech;
32
33static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = {
34#if defined(CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_AES_SHA1)
35 /*
36 * AES-128 with SHA-1 (RFC 3962)
37 */
38 {
39 .etype = ENCTYPE_AES128_CTS_HMAC_SHA1_96,
40 .ctype = CKSUMTYPE_HMAC_SHA1_96_AES128,
41 .name = "aes128-cts",
42 .encrypt_name = "cts(cbc(aes))",
43 .aux_cipher = "cbc(aes)",
44 .cksum_name = "hmac(sha1)",
45 .derive_key = krb5_derive_key_v2,
46 .encrypt = gss_krb5_aes_encrypt,
47 .decrypt = gss_krb5_aes_decrypt,
48
49 .get_mic = gss_krb5_get_mic_v2,
50 .verify_mic = gss_krb5_verify_mic_v2,
51 .wrap = gss_krb5_wrap_v2,
52 .unwrap = gss_krb5_unwrap_v2,
53
54 .signalg = -1,
55 .sealalg = -1,
56 .keybytes = 16,
57 .keylength = BITS2OCTETS(128),
58 .Kc_length = BITS2OCTETS(128),
59 .Ke_length = BITS2OCTETS(128),
60 .Ki_length = BITS2OCTETS(128),
61 .cksumlength = BITS2OCTETS(96),
62 .keyed_cksum = 1,
63 },
64 /*
65 * AES-256 with SHA-1 (RFC 3962)
66 */
67 {
68 .etype = ENCTYPE_AES256_CTS_HMAC_SHA1_96,
69 .ctype = CKSUMTYPE_HMAC_SHA1_96_AES256,
70 .name = "aes256-cts",
71 .encrypt_name = "cts(cbc(aes))",
72 .aux_cipher = "cbc(aes)",
73 .cksum_name = "hmac(sha1)",
74 .derive_key = krb5_derive_key_v2,
75 .encrypt = gss_krb5_aes_encrypt,
76 .decrypt = gss_krb5_aes_decrypt,
77
78 .get_mic = gss_krb5_get_mic_v2,
79 .verify_mic = gss_krb5_verify_mic_v2,
80 .wrap = gss_krb5_wrap_v2,
81 .unwrap = gss_krb5_unwrap_v2,
82
83 .signalg = -1,
84 .sealalg = -1,
85 .keybytes = 32,
86 .keylength = BITS2OCTETS(256),
87 .Kc_length = BITS2OCTETS(256),
88 .Ke_length = BITS2OCTETS(256),
89 .Ki_length = BITS2OCTETS(256),
90 .cksumlength = BITS2OCTETS(96),
91 .keyed_cksum = 1,
92 },
93#endif
94
95#if defined(CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_CAMELLIA)
96 /*
97 * Camellia-128 with CMAC (RFC 6803)
98 */
99 {
100 .etype = ENCTYPE_CAMELLIA128_CTS_CMAC,
101 .ctype = CKSUMTYPE_CMAC_CAMELLIA128,
102 .name = "camellia128-cts-cmac",
103 .encrypt_name = "cts(cbc(camellia))",
104 .aux_cipher = "cbc(camellia)",
105 .cksum_name = "cmac(camellia)",
106 .cksumlength = BITS2OCTETS(128),
107 .keyed_cksum = 1,
108 .keylength = BITS2OCTETS(128),
109 .Kc_length = BITS2OCTETS(128),
110 .Ke_length = BITS2OCTETS(128),
111 .Ki_length = BITS2OCTETS(128),
112
113 .derive_key = krb5_kdf_feedback_cmac,
114 .encrypt = gss_krb5_aes_encrypt,
115 .decrypt = gss_krb5_aes_decrypt,
116
117 .get_mic = gss_krb5_get_mic_v2,
118 .verify_mic = gss_krb5_verify_mic_v2,
119 .wrap = gss_krb5_wrap_v2,
120 .unwrap = gss_krb5_unwrap_v2,
121 },
122 /*
123 * Camellia-256 with CMAC (RFC 6803)
124 */
125 {
126 .etype = ENCTYPE_CAMELLIA256_CTS_CMAC,
127 .ctype = CKSUMTYPE_CMAC_CAMELLIA256,
128 .name = "camellia256-cts-cmac",
129 .encrypt_name = "cts(cbc(camellia))",
130 .aux_cipher = "cbc(camellia)",
131 .cksum_name = "cmac(camellia)",
132 .cksumlength = BITS2OCTETS(128),
133 .keyed_cksum = 1,
134 .keylength = BITS2OCTETS(256),
135 .Kc_length = BITS2OCTETS(256),
136 .Ke_length = BITS2OCTETS(256),
137 .Ki_length = BITS2OCTETS(256),
138
139 .derive_key = krb5_kdf_feedback_cmac,
140 .encrypt = gss_krb5_aes_encrypt,
141 .decrypt = gss_krb5_aes_decrypt,
142
143 .get_mic = gss_krb5_get_mic_v2,
144 .verify_mic = gss_krb5_verify_mic_v2,
145 .wrap = gss_krb5_wrap_v2,
146 .unwrap = gss_krb5_unwrap_v2,
147 },
148#endif
149
150#if defined(CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_AES_SHA2)
151 /*
152 * AES-128 with SHA-256 (RFC 8009)
153 */
154 {
155 .etype = ENCTYPE_AES128_CTS_HMAC_SHA256_128,
156 .ctype = CKSUMTYPE_HMAC_SHA256_128_AES128,
157 .name = "aes128-cts-hmac-sha256-128",
158 .encrypt_name = "cts(cbc(aes))",
159 .aux_cipher = "cbc(aes)",
160 .cksum_name = "hmac(sha256)",
161 .cksumlength = BITS2OCTETS(128),
162 .keyed_cksum = 1,
163 .keylength = BITS2OCTETS(128),
164 .Kc_length = BITS2OCTETS(128),
165 .Ke_length = BITS2OCTETS(128),
166 .Ki_length = BITS2OCTETS(128),
167
168 .derive_key = krb5_kdf_hmac_sha2,
169 .encrypt = krb5_etm_encrypt,
170 .decrypt = krb5_etm_decrypt,
171
172 .get_mic = gss_krb5_get_mic_v2,
173 .verify_mic = gss_krb5_verify_mic_v2,
174 .wrap = gss_krb5_wrap_v2,
175 .unwrap = gss_krb5_unwrap_v2,
176 },
177 /*
178 * AES-256 with SHA-384 (RFC 8009)
179 */
180 {
181 .etype = ENCTYPE_AES256_CTS_HMAC_SHA384_192,
182 .ctype = CKSUMTYPE_HMAC_SHA384_192_AES256,
183 .name = "aes256-cts-hmac-sha384-192",
184 .encrypt_name = "cts(cbc(aes))",
185 .aux_cipher = "cbc(aes)",
186 .cksum_name = "hmac(sha384)",
187 .cksumlength = BITS2OCTETS(192),
188 .keyed_cksum = 1,
189 .keylength = BITS2OCTETS(256),
190 .Kc_length = BITS2OCTETS(192),
191 .Ke_length = BITS2OCTETS(256),
192 .Ki_length = BITS2OCTETS(192),
193
194 .derive_key = krb5_kdf_hmac_sha2,
195 .encrypt = krb5_etm_encrypt,
196 .decrypt = krb5_etm_decrypt,
197
198 .get_mic = gss_krb5_get_mic_v2,
199 .verify_mic = gss_krb5_verify_mic_v2,
200 .wrap = gss_krb5_wrap_v2,
201 .unwrap = gss_krb5_unwrap_v2,
202 },
203#endif
204};
205
206/*
207 * The list of advertised enctypes is specified in order of most
208 * preferred to least.
209 */
210static char gss_krb5_enctype_priority_list[64];
211
212static void gss_krb5_prepare_enctype_priority_list(void)
213{
214 static const u32 gss_krb5_enctypes[] = {
215#if defined(CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_AES_SHA2)
216 ENCTYPE_AES256_CTS_HMAC_SHA384_192,
217 ENCTYPE_AES128_CTS_HMAC_SHA256_128,
218#endif
219#if defined(CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_CAMELLIA)
220 ENCTYPE_CAMELLIA256_CTS_CMAC,
221 ENCTYPE_CAMELLIA128_CTS_CMAC,
222#endif
223#if defined(CONFIG_RPCSEC_GSS_KRB5_ENCTYPES_AES_SHA1)
224 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
225 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
226#endif
227 };
228 size_t total, i;
229 char buf[16];
230 char *sep;
231 int n;
232
233 sep = "";
234 gss_krb5_enctype_priority_list[0] = '\0';
235 for (total = 0, i = 0; i < ARRAY_SIZE(gss_krb5_enctypes); i++) {
236 n = sprintf(buf, "%s%u", sep, gss_krb5_enctypes[i]);
237 if (n < 0)
238 break;
239 if (total + n >= sizeof(gss_krb5_enctype_priority_list))
240 break;
241 strcat(gss_krb5_enctype_priority_list, buf);
242 sep = ",";
243 total += n;
244 }
245}
246
247/**
248 * gss_krb5_lookup_enctype - Retrieve profile information for a given enctype
249 * @etype: ENCTYPE value
250 *
251 * Returns a pointer to a gss_krb5_enctype structure, or NULL if no
252 * matching etype is found.
253 */
254VISIBLE_IF_KUNIT
255const struct gss_krb5_enctype *gss_krb5_lookup_enctype(u32 etype)
256{
257 size_t i;
258
259 for (i = 0; i < ARRAY_SIZE(supported_gss_krb5_enctypes); i++)
260 if (supported_gss_krb5_enctypes[i].etype == etype)
261 return &supported_gss_krb5_enctypes[i];
262 return NULL;
263}
264EXPORT_SYMBOL_IF_KUNIT(gss_krb5_lookup_enctype);
265
266static struct crypto_sync_skcipher *
267gss_krb5_alloc_cipher_v2(const char *cname, const struct xdr_netobj *key)
268{
269 struct crypto_sync_skcipher *tfm;
270
271 tfm = crypto_alloc_sync_skcipher(cname, 0, 0);
272 if (IS_ERR(tfm))
273 return NULL;
274 if (crypto_sync_skcipher_setkey(tfm, key->data, key->len)) {
275 crypto_free_sync_skcipher(tfm);
276 return NULL;
277 }
278 return tfm;
279}
280
281static struct crypto_ahash *
282gss_krb5_alloc_hash_v2(struct krb5_ctx *kctx, const struct xdr_netobj *key)
283{
284 struct crypto_ahash *tfm;
285
286 tfm = crypto_alloc_ahash(kctx->gk5e->cksum_name, 0, CRYPTO_ALG_ASYNC);
287 if (IS_ERR(tfm))
288 return NULL;
289 if (crypto_ahash_setkey(tfm, key->data, key->len)) {
290 crypto_free_ahash(tfm);
291 return NULL;
292 }
293 return tfm;
294}
295
296static int
297gss_krb5_import_ctx_v2(struct krb5_ctx *ctx, gfp_t gfp_mask)
298{
299 struct xdr_netobj keyin = {
300 .len = ctx->gk5e->keylength,
301 .data = ctx->Ksess,
302 };
303 struct xdr_netobj keyout;
304 int ret = -EINVAL;
305
306 keyout.data = kmalloc(GSS_KRB5_MAX_KEYLEN, gfp_mask);
307 if (!keyout.data)
308 return -ENOMEM;
309
310 /* initiator seal encryption */
311 keyout.len = ctx->gk5e->Ke_length;
312 if (krb5_derive_key(ctx, &keyin, &keyout, KG_USAGE_INITIATOR_SEAL,
313 KEY_USAGE_SEED_ENCRYPTION, gfp_mask))
314 goto out;
315 ctx->initiator_enc = gss_krb5_alloc_cipher_v2(ctx->gk5e->encrypt_name,
316 &keyout);
317 if (ctx->initiator_enc == NULL)
318 goto out;
319 if (ctx->gk5e->aux_cipher) {
320 ctx->initiator_enc_aux =
321 gss_krb5_alloc_cipher_v2(ctx->gk5e->aux_cipher,
322 &keyout);
323 if (ctx->initiator_enc_aux == NULL)
324 goto out_free;
325 }
326
327 /* acceptor seal encryption */
328 if (krb5_derive_key(ctx, &keyin, &keyout, KG_USAGE_ACCEPTOR_SEAL,
329 KEY_USAGE_SEED_ENCRYPTION, gfp_mask))
330 goto out_free;
331 ctx->acceptor_enc = gss_krb5_alloc_cipher_v2(ctx->gk5e->encrypt_name,
332 &keyout);
333 if (ctx->acceptor_enc == NULL)
334 goto out_free;
335 if (ctx->gk5e->aux_cipher) {
336 ctx->acceptor_enc_aux =
337 gss_krb5_alloc_cipher_v2(ctx->gk5e->aux_cipher,
338 &keyout);
339 if (ctx->acceptor_enc_aux == NULL)
340 goto out_free;
341 }
342
343 /* initiator sign checksum */
344 keyout.len = ctx->gk5e->Kc_length;
345 if (krb5_derive_key(ctx, &keyin, &keyout, KG_USAGE_INITIATOR_SIGN,
346 KEY_USAGE_SEED_CHECKSUM, gfp_mask))
347 goto out_free;
348 ctx->initiator_sign = gss_krb5_alloc_hash_v2(ctx, &keyout);
349 if (ctx->initiator_sign == NULL)
350 goto out_free;
351
352 /* acceptor sign checksum */
353 if (krb5_derive_key(ctx, &keyin, &keyout, KG_USAGE_ACCEPTOR_SIGN,
354 KEY_USAGE_SEED_CHECKSUM, gfp_mask))
355 goto out_free;
356 ctx->acceptor_sign = gss_krb5_alloc_hash_v2(ctx, &keyout);
357 if (ctx->acceptor_sign == NULL)
358 goto out_free;
359
360 /* initiator seal integrity */
361 keyout.len = ctx->gk5e->Ki_length;
362 if (krb5_derive_key(ctx, &keyin, &keyout, KG_USAGE_INITIATOR_SEAL,
363 KEY_USAGE_SEED_INTEGRITY, gfp_mask))
364 goto out_free;
365 ctx->initiator_integ = gss_krb5_alloc_hash_v2(ctx, &keyout);
366 if (ctx->initiator_integ == NULL)
367 goto out_free;
368
369 /* acceptor seal integrity */
370 if (krb5_derive_key(ctx, &keyin, &keyout, KG_USAGE_ACCEPTOR_SEAL,
371 KEY_USAGE_SEED_INTEGRITY, gfp_mask))
372 goto out_free;
373 ctx->acceptor_integ = gss_krb5_alloc_hash_v2(ctx, &keyout);
374 if (ctx->acceptor_integ == NULL)
375 goto out_free;
376
377 ret = 0;
378out:
379 kfree_sensitive(keyout.data);
380 return ret;
381
382out_free:
383 crypto_free_ahash(ctx->acceptor_integ);
384 crypto_free_ahash(ctx->initiator_integ);
385 crypto_free_ahash(ctx->acceptor_sign);
386 crypto_free_ahash(ctx->initiator_sign);
387 crypto_free_sync_skcipher(ctx->acceptor_enc_aux);
388 crypto_free_sync_skcipher(ctx->acceptor_enc);
389 crypto_free_sync_skcipher(ctx->initiator_enc_aux);
390 crypto_free_sync_skcipher(ctx->initiator_enc);
391 goto out;
392}
393
394static int
395gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx,
396 gfp_t gfp_mask)
397{
398 u64 seq_send64;
399 int keylen;
400 u32 time32;
401
402 p = simple_get_bytes(p, end, &ctx->flags, sizeof(ctx->flags));
403 if (IS_ERR(p))
404 goto out_err;
405 ctx->initiate = ctx->flags & KRB5_CTX_FLAG_INITIATOR;
406
407 p = simple_get_bytes(p, end, &time32, sizeof(time32));
408 if (IS_ERR(p))
409 goto out_err;
410 /* unsigned 32-bit time overflows in year 2106 */
411 ctx->endtime = (time64_t)time32;
412 p = simple_get_bytes(p, end, &seq_send64, sizeof(seq_send64));
413 if (IS_ERR(p))
414 goto out_err;
415 atomic64_set(&ctx->seq_send64, seq_send64);
416 /* set seq_send for use by "older" enctypes */
417 atomic_set(&ctx->seq_send, seq_send64);
418 if (seq_send64 != atomic_read(&ctx->seq_send)) {
419 dprintk("%s: seq_send64 %llx, seq_send %x overflow?\n", __func__,
420 seq_send64, atomic_read(&ctx->seq_send));
421 p = ERR_PTR(-EINVAL);
422 goto out_err;
423 }
424 p = simple_get_bytes(p, end, &ctx->enctype, sizeof(ctx->enctype));
425 if (IS_ERR(p))
426 goto out_err;
427 ctx->gk5e = gss_krb5_lookup_enctype(ctx->enctype);
428 if (ctx->gk5e == NULL) {
429 dprintk("gss_kerberos_mech: unsupported krb5 enctype %u\n",
430 ctx->enctype);
431 p = ERR_PTR(-EINVAL);
432 goto out_err;
433 }
434 keylen = ctx->gk5e->keylength;
435
436 p = simple_get_bytes(p, end, ctx->Ksess, keylen);
437 if (IS_ERR(p))
438 goto out_err;
439
440 if (p != end) {
441 p = ERR_PTR(-EINVAL);
442 goto out_err;
443 }
444
445 ctx->mech_used.data = kmemdup(gss_kerberos_mech.gm_oid.data,
446 gss_kerberos_mech.gm_oid.len, gfp_mask);
447 if (unlikely(ctx->mech_used.data == NULL)) {
448 p = ERR_PTR(-ENOMEM);
449 goto out_err;
450 }
451 ctx->mech_used.len = gss_kerberos_mech.gm_oid.len;
452
453 return gss_krb5_import_ctx_v2(ctx, gfp_mask);
454
455out_err:
456 return PTR_ERR(p);
457}
458
459static int
460gss_krb5_import_sec_context(const void *p, size_t len, struct gss_ctx *ctx_id,
461 time64_t *endtime, gfp_t gfp_mask)
462{
463 const void *end = (const void *)((const char *)p + len);
464 struct krb5_ctx *ctx;
465 int ret;
466
467 ctx = kzalloc(sizeof(*ctx), gfp_mask);
468 if (ctx == NULL)
469 return -ENOMEM;
470
471 ret = gss_import_v2_context(p, end, ctx, gfp_mask);
472 memzero_explicit(&ctx->Ksess, sizeof(ctx->Ksess));
473 if (ret) {
474 kfree(ctx);
475 return ret;
476 }
477
478 ctx_id->internal_ctx_id = ctx;
479 if (endtime)
480 *endtime = ctx->endtime;
481 return 0;
482}
483
484static void
485gss_krb5_delete_sec_context(void *internal_ctx)
486{
487 struct krb5_ctx *kctx = internal_ctx;
488
489 crypto_free_sync_skcipher(kctx->seq);
490 crypto_free_sync_skcipher(kctx->enc);
491 crypto_free_sync_skcipher(kctx->acceptor_enc);
492 crypto_free_sync_skcipher(kctx->initiator_enc);
493 crypto_free_sync_skcipher(kctx->acceptor_enc_aux);
494 crypto_free_sync_skcipher(kctx->initiator_enc_aux);
495 crypto_free_ahash(kctx->acceptor_sign);
496 crypto_free_ahash(kctx->initiator_sign);
497 crypto_free_ahash(kctx->acceptor_integ);
498 crypto_free_ahash(kctx->initiator_integ);
499 kfree(kctx->mech_used.data);
500 kfree(kctx);
501}
502
503/**
504 * gss_krb5_get_mic - get_mic for the Kerberos GSS mechanism
505 * @gctx: GSS context
506 * @text: plaintext to checksum
507 * @token: buffer into which to write the computed checksum
508 *
509 * Return values:
510 * %GSS_S_COMPLETE - success, and @token is filled in
511 * %GSS_S_FAILURE - checksum could not be generated
512 * %GSS_S_CONTEXT_EXPIRED - Kerberos context is no longer valid
513 */
514static u32 gss_krb5_get_mic(struct gss_ctx *gctx, struct xdr_buf *text,
515 struct xdr_netobj *token)
516{
517 struct krb5_ctx *kctx = gctx->internal_ctx_id;
518
519 return kctx->gk5e->get_mic(kctx, text, token);
520}
521
522/**
523 * gss_krb5_verify_mic - verify_mic for the Kerberos GSS mechanism
524 * @gctx: GSS context
525 * @message_buffer: plaintext to check
526 * @read_token: received checksum to check
527 *
528 * Return values:
529 * %GSS_S_COMPLETE - computed and received checksums match
530 * %GSS_S_DEFECTIVE_TOKEN - received checksum is not valid
531 * %GSS_S_BAD_SIG - computed and received checksums do not match
532 * %GSS_S_FAILURE - received checksum could not be checked
533 * %GSS_S_CONTEXT_EXPIRED - Kerberos context is no longer valid
534 */
535static u32 gss_krb5_verify_mic(struct gss_ctx *gctx,
536 struct xdr_buf *message_buffer,
537 struct xdr_netobj *read_token)
538{
539 struct krb5_ctx *kctx = gctx->internal_ctx_id;
540
541 return kctx->gk5e->verify_mic(kctx, message_buffer, read_token);
542}
543
544/**
545 * gss_krb5_wrap - gss_wrap for the Kerberos GSS mechanism
546 * @gctx: initialized GSS context
547 * @offset: byte offset in @buf to start writing the cipher text
548 * @buf: OUT: send buffer
549 * @pages: plaintext to wrap
550 *
551 * Return values:
552 * %GSS_S_COMPLETE - success, @buf has been updated
553 * %GSS_S_FAILURE - @buf could not be wrapped
554 * %GSS_S_CONTEXT_EXPIRED - Kerberos context is no longer valid
555 */
556static u32 gss_krb5_wrap(struct gss_ctx *gctx, int offset,
557 struct xdr_buf *buf, struct page **pages)
558{
559 struct krb5_ctx *kctx = gctx->internal_ctx_id;
560
561 return kctx->gk5e->wrap(kctx, offset, buf, pages);
562}
563
564/**
565 * gss_krb5_unwrap - gss_unwrap for the Kerberos GSS mechanism
566 * @gctx: initialized GSS context
567 * @offset: starting byte offset into @buf
568 * @len: size of ciphertext to unwrap
569 * @buf: ciphertext to unwrap
570 *
571 * Return values:
572 * %GSS_S_COMPLETE - success, @buf has been updated
573 * %GSS_S_DEFECTIVE_TOKEN - received blob is not valid
574 * %GSS_S_BAD_SIG - computed and received checksums do not match
575 * %GSS_S_FAILURE - @buf could not be unwrapped
576 * %GSS_S_CONTEXT_EXPIRED - Kerberos context is no longer valid
577 */
578static u32 gss_krb5_unwrap(struct gss_ctx *gctx, int offset,
579 int len, struct xdr_buf *buf)
580{
581 struct krb5_ctx *kctx = gctx->internal_ctx_id;
582
583 return kctx->gk5e->unwrap(kctx, offset, len, buf,
584 &gctx->slack, &gctx->align);
585}
586
587static const struct gss_api_ops gss_kerberos_ops = {
588 .gss_import_sec_context = gss_krb5_import_sec_context,
589 .gss_get_mic = gss_krb5_get_mic,
590 .gss_verify_mic = gss_krb5_verify_mic,
591 .gss_wrap = gss_krb5_wrap,
592 .gss_unwrap = gss_krb5_unwrap,
593 .gss_delete_sec_context = gss_krb5_delete_sec_context,
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 = gss_krb5_enctype_priority_list,
635};
636
637static int __init init_kerberos_module(void)
638{
639 int status;
640
641 gss_krb5_prepare_enctype_priority_list();
642 status = gss_mech_register(&gss_kerberos_mech);
643 if (status)
644 printk("Failed to register kerberos gss mechanism!\n");
645 return status;
646}
647
648static void __exit cleanup_kerberos_module(void)
649{
650 gss_mech_unregister(&gss_kerberos_mech);
651}
652
653MODULE_DESCRIPTION("Sun RPC Kerberos 5 module");
654MODULE_LICENSE("GPL");
655module_init(init_kerberos_module);
656module_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);