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Linux/net/sunrpc/auth_gss/gss_krb5_mech.c

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

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