ia64/linux-2.6.18-xen.hg

view fs/cifs/asn1.c @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
1 /*
2 * The ASB.1/BER parsing code is derived from ip_nat_snmp_basic.c which was in
3 * turn derived from the gxsnmp package by Gregory McLean & Jochen Friedrich
4 *
5 * Copyright (c) 2000 RP Internet (www.rpi.net.au).
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/kernel.h>
23 #include <linux/mm.h>
24 #include <linux/slab.h>
25 #include "cifspdu.h"
26 #include "cifsglob.h"
27 #include "cifs_debug.h"
28 #include "cifsproto.h"
30 /*****************************************************************************
31 *
32 * Basic ASN.1 decoding routines (gxsnmp author Dirk Wisse)
33 *
34 *****************************************************************************/
36 /* Class */
37 #define ASN1_UNI 0 /* Universal */
38 #define ASN1_APL 1 /* Application */
39 #define ASN1_CTX 2 /* Context */
40 #define ASN1_PRV 3 /* Private */
42 /* Tag */
43 #define ASN1_EOC 0 /* End Of Contents or N/A */
44 #define ASN1_BOL 1 /* Boolean */
45 #define ASN1_INT 2 /* Integer */
46 #define ASN1_BTS 3 /* Bit String */
47 #define ASN1_OTS 4 /* Octet String */
48 #define ASN1_NUL 5 /* Null */
49 #define ASN1_OJI 6 /* Object Identifier */
50 #define ASN1_OJD 7 /* Object Description */
51 #define ASN1_EXT 8 /* External */
52 #define ASN1_SEQ 16 /* Sequence */
53 #define ASN1_SET 17 /* Set */
54 #define ASN1_NUMSTR 18 /* Numerical String */
55 #define ASN1_PRNSTR 19 /* Printable String */
56 #define ASN1_TEXSTR 20 /* Teletext String */
57 #define ASN1_VIDSTR 21 /* Video String */
58 #define ASN1_IA5STR 22 /* IA5 String */
59 #define ASN1_UNITIM 23 /* Universal Time */
60 #define ASN1_GENTIM 24 /* General Time */
61 #define ASN1_GRASTR 25 /* Graphical String */
62 #define ASN1_VISSTR 26 /* Visible String */
63 #define ASN1_GENSTR 27 /* General String */
65 /* Primitive / Constructed methods*/
66 #define ASN1_PRI 0 /* Primitive */
67 #define ASN1_CON 1 /* Constructed */
69 /*
70 * Error codes.
71 */
72 #define ASN1_ERR_NOERROR 0
73 #define ASN1_ERR_DEC_EMPTY 2
74 #define ASN1_ERR_DEC_EOC_MISMATCH 3
75 #define ASN1_ERR_DEC_LENGTH_MISMATCH 4
76 #define ASN1_ERR_DEC_BADVALUE 5
78 #define SPNEGO_OID_LEN 7
79 #define NTLMSSP_OID_LEN 10
80 static unsigned long SPNEGO_OID[7] = { 1, 3, 6, 1, 5, 5, 2 };
81 static unsigned long NTLMSSP_OID[10] = { 1, 3, 6, 1, 4, 1, 311, 2, 2, 10 };
83 /*
84 * ASN.1 context.
85 */
86 struct asn1_ctx {
87 int error; /* Error condition */
88 unsigned char *pointer; /* Octet just to be decoded */
89 unsigned char *begin; /* First octet */
90 unsigned char *end; /* Octet after last octet */
91 };
93 /*
94 * Octet string (not null terminated)
95 */
96 struct asn1_octstr {
97 unsigned char *data;
98 unsigned int len;
99 };
101 static void
102 asn1_open(struct asn1_ctx *ctx, unsigned char *buf, unsigned int len)
103 {
104 ctx->begin = buf;
105 ctx->end = buf + len;
106 ctx->pointer = buf;
107 ctx->error = ASN1_ERR_NOERROR;
108 }
110 static unsigned char
111 asn1_octet_decode(struct asn1_ctx *ctx, unsigned char *ch)
112 {
113 if (ctx->pointer >= ctx->end) {
114 ctx->error = ASN1_ERR_DEC_EMPTY;
115 return 0;
116 }
117 *ch = *(ctx->pointer)++;
118 return 1;
119 }
121 static unsigned char
122 asn1_tag_decode(struct asn1_ctx *ctx, unsigned int *tag)
123 {
124 unsigned char ch;
126 *tag = 0;
128 do {
129 if (!asn1_octet_decode(ctx, &ch))
130 return 0;
131 *tag <<= 7;
132 *tag |= ch & 0x7F;
133 } while ((ch & 0x80) == 0x80);
134 return 1;
135 }
137 static unsigned char
138 asn1_id_decode(struct asn1_ctx *ctx,
139 unsigned int *cls, unsigned int *con, unsigned int *tag)
140 {
141 unsigned char ch;
143 if (!asn1_octet_decode(ctx, &ch))
144 return 0;
146 *cls = (ch & 0xC0) >> 6;
147 *con = (ch & 0x20) >> 5;
148 *tag = (ch & 0x1F);
150 if (*tag == 0x1F) {
151 if (!asn1_tag_decode(ctx, tag))
152 return 0;
153 }
154 return 1;
155 }
157 static unsigned char
158 asn1_length_decode(struct asn1_ctx *ctx, unsigned int *def, unsigned int *len)
159 {
160 unsigned char ch, cnt;
162 if (!asn1_octet_decode(ctx, &ch))
163 return 0;
165 if (ch == 0x80)
166 *def = 0;
167 else {
168 *def = 1;
170 if (ch < 0x80)
171 *len = ch;
172 else {
173 cnt = (unsigned char) (ch & 0x7F);
174 *len = 0;
176 while (cnt > 0) {
177 if (!asn1_octet_decode(ctx, &ch))
178 return 0;
179 *len <<= 8;
180 *len |= ch;
181 cnt--;
182 }
183 }
184 }
185 return 1;
186 }
188 static unsigned char
189 asn1_header_decode(struct asn1_ctx *ctx,
190 unsigned char **eoc,
191 unsigned int *cls, unsigned int *con, unsigned int *tag)
192 {
193 unsigned int def = 0;
194 unsigned int len = 0;
196 if (!asn1_id_decode(ctx, cls, con, tag))
197 return 0;
199 if (!asn1_length_decode(ctx, &def, &len))
200 return 0;
202 if (def)
203 *eoc = ctx->pointer + len;
204 else
205 *eoc = NULL;
206 return 1;
207 }
209 static unsigned char
210 asn1_eoc_decode(struct asn1_ctx *ctx, unsigned char *eoc)
211 {
212 unsigned char ch;
214 if (eoc == NULL) {
215 if (!asn1_octet_decode(ctx, &ch))
216 return 0;
218 if (ch != 0x00) {
219 ctx->error = ASN1_ERR_DEC_EOC_MISMATCH;
220 return 0;
221 }
223 if (!asn1_octet_decode(ctx, &ch))
224 return 0;
226 if (ch != 0x00) {
227 ctx->error = ASN1_ERR_DEC_EOC_MISMATCH;
228 return 0;
229 }
230 return 1;
231 } else {
232 if (ctx->pointer != eoc) {
233 ctx->error = ASN1_ERR_DEC_LENGTH_MISMATCH;
234 return 0;
235 }
236 return 1;
237 }
238 }
240 /* static unsigned char asn1_null_decode(struct asn1_ctx *ctx,
241 unsigned char *eoc)
242 {
243 ctx->pointer = eoc;
244 return 1;
245 }
247 static unsigned char asn1_long_decode(struct asn1_ctx *ctx,
248 unsigned char *eoc, long *integer)
249 {
250 unsigned char ch;
251 unsigned int len;
253 if (!asn1_octet_decode(ctx, &ch))
254 return 0;
256 *integer = (signed char) ch;
257 len = 1;
259 while (ctx->pointer < eoc) {
260 if (++len > sizeof(long)) {
261 ctx->error = ASN1_ERR_DEC_BADVALUE;
262 return 0;
263 }
265 if (!asn1_octet_decode(ctx, &ch))
266 return 0;
268 *integer <<= 8;
269 *integer |= ch;
270 }
271 return 1;
272 }
274 static unsigned char asn1_uint_decode(struct asn1_ctx *ctx,
275 unsigned char *eoc,
276 unsigned int *integer)
277 {
278 unsigned char ch;
279 unsigned int len;
281 if (!asn1_octet_decode(ctx, &ch))
282 return 0;
284 *integer = ch;
285 if (ch == 0)
286 len = 0;
287 else
288 len = 1;
290 while (ctx->pointer < eoc) {
291 if (++len > sizeof(unsigned int)) {
292 ctx->error = ASN1_ERR_DEC_BADVALUE;
293 return 0;
294 }
296 if (!asn1_octet_decode(ctx, &ch))
297 return 0;
299 *integer <<= 8;
300 *integer |= ch;
301 }
302 return 1;
303 }
305 static unsigned char asn1_ulong_decode(struct asn1_ctx *ctx,
306 unsigned char *eoc,
307 unsigned long *integer)
308 {
309 unsigned char ch;
310 unsigned int len;
312 if (!asn1_octet_decode(ctx, &ch))
313 return 0;
315 *integer = ch;
316 if (ch == 0)
317 len = 0;
318 else
319 len = 1;
321 while (ctx->pointer < eoc) {
322 if (++len > sizeof(unsigned long)) {
323 ctx->error = ASN1_ERR_DEC_BADVALUE;
324 return 0;
325 }
327 if (!asn1_octet_decode(ctx, &ch))
328 return 0;
330 *integer <<= 8;
331 *integer |= ch;
332 }
333 return 1;
334 }
336 static unsigned char
337 asn1_octets_decode(struct asn1_ctx *ctx,
338 unsigned char *eoc,
339 unsigned char **octets, unsigned int *len)
340 {
341 unsigned char *ptr;
343 *len = 0;
345 *octets = kmalloc(eoc - ctx->pointer, GFP_ATOMIC);
346 if (*octets == NULL) {
347 return 0;
348 }
350 ptr = *octets;
351 while (ctx->pointer < eoc) {
352 if (!asn1_octet_decode(ctx, (unsigned char *) ptr++)) {
353 kfree(*octets);
354 *octets = NULL;
355 return 0;
356 }
357 (*len)++;
358 }
359 return 1;
360 } */
362 static unsigned char
363 asn1_subid_decode(struct asn1_ctx *ctx, unsigned long *subid)
364 {
365 unsigned char ch;
367 *subid = 0;
369 do {
370 if (!asn1_octet_decode(ctx, &ch))
371 return 0;
373 *subid <<= 7;
374 *subid |= ch & 0x7F;
375 } while ((ch & 0x80) == 0x80);
376 return 1;
377 }
379 static int
380 asn1_oid_decode(struct asn1_ctx *ctx,
381 unsigned char *eoc, unsigned long **oid, unsigned int *len)
382 {
383 unsigned long subid;
384 unsigned int size;
385 unsigned long *optr;
387 size = eoc - ctx->pointer + 1;
388 *oid = kmalloc(size * sizeof (unsigned long), GFP_ATOMIC);
389 if (*oid == NULL) {
390 return 0;
391 }
393 optr = *oid;
395 if (!asn1_subid_decode(ctx, &subid)) {
396 kfree(*oid);
397 *oid = NULL;
398 return 0;
399 }
401 if (subid < 40) {
402 optr[0] = 0;
403 optr[1] = subid;
404 } else if (subid < 80) {
405 optr[0] = 1;
406 optr[1] = subid - 40;
407 } else {
408 optr[0] = 2;
409 optr[1] = subid - 80;
410 }
412 *len = 2;
413 optr += 2;
415 while (ctx->pointer < eoc) {
416 if (++(*len) > size) {
417 ctx->error = ASN1_ERR_DEC_BADVALUE;
418 kfree(*oid);
419 *oid = NULL;
420 return 0;
421 }
423 if (!asn1_subid_decode(ctx, optr++)) {
424 kfree(*oid);
425 *oid = NULL;
426 return 0;
427 }
428 }
429 return 1;
430 }
432 static int
433 compare_oid(unsigned long *oid1, unsigned int oid1len,
434 unsigned long *oid2, unsigned int oid2len)
435 {
436 unsigned int i;
438 if (oid1len != oid2len)
439 return 0;
440 else {
441 for (i = 0; i < oid1len; i++) {
442 if (oid1[i] != oid2[i])
443 return 0;
444 }
445 return 1;
446 }
447 }
449 /* BB check for endian conversion issues here */
451 int
452 decode_negTokenInit(unsigned char *security_blob, int length,
453 enum securityEnum *secType)
454 {
455 struct asn1_ctx ctx;
456 unsigned char *end;
457 unsigned char *sequence_end;
458 unsigned long *oid = NULL;
459 unsigned int cls, con, tag, oidlen, rc;
460 int use_ntlmssp = FALSE;
462 *secType = NTLM; /* BB eventually make Kerberos or NLTMSSP the default */
464 /* cifs_dump_mem(" Received SecBlob ", security_blob, length); */
466 asn1_open(&ctx, security_blob, length);
468 if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
469 cFYI(1, ("Error decoding negTokenInit header"));
470 return 0;
471 } else if ((cls != ASN1_APL) || (con != ASN1_CON)
472 || (tag != ASN1_EOC)) {
473 cFYI(1, ("cls = %d con = %d tag = %d", cls, con, tag));
474 return 0;
475 } else {
476 /* remember to free obj->oid */
477 rc = asn1_header_decode(&ctx, &end, &cls, &con, &tag);
478 if (rc) {
479 if ((tag == ASN1_OJI) && (cls == ASN1_PRI)) {
480 rc = asn1_oid_decode(&ctx, end, &oid, &oidlen);
481 if (rc) {
482 rc = compare_oid(oid, oidlen,
483 SPNEGO_OID,
484 SPNEGO_OID_LEN);
485 kfree(oid);
486 }
487 } else
488 rc = 0;
489 }
491 if (!rc) {
492 cFYI(1, ("Error decoding negTokenInit header"));
493 return 0;
494 }
496 if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
497 cFYI(1, ("Error decoding negTokenInit"));
498 return 0;
499 } else if ((cls != ASN1_CTX) || (con != ASN1_CON)
500 || (tag != ASN1_EOC)) {
501 cFYI(1,("cls = %d con = %d tag = %d end = %p (%d) exit 0",
502 cls, con, tag, end, *end));
503 return 0;
504 }
506 if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
507 cFYI(1, ("Error decoding negTokenInit"));
508 return 0;
509 } else if ((cls != ASN1_UNI) || (con != ASN1_CON)
510 || (tag != ASN1_SEQ)) {
511 cFYI(1,("cls = %d con = %d tag = %d end = %p (%d) exit 1",
512 cls, con, tag, end, *end));
513 return 0;
514 }
516 if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
517 cFYI(1, ("Error decoding 2nd part of negTokenInit"));
518 return 0;
519 } else if ((cls != ASN1_CTX) || (con != ASN1_CON)
520 || (tag != ASN1_EOC)) {
521 cFYI(1,
522 ("cls = %d con = %d tag = %d end = %p (%d) exit 0",
523 cls, con, tag, end, *end));
524 return 0;
525 }
527 if (asn1_header_decode
528 (&ctx, &sequence_end, &cls, &con, &tag) == 0) {
529 cFYI(1, ("Error decoding 2nd part of negTokenInit"));
530 return 0;
531 } else if ((cls != ASN1_UNI) || (con != ASN1_CON)
532 || (tag != ASN1_SEQ)) {
533 cFYI(1,
534 ("cls = %d con = %d tag = %d end = %p (%d) exit 1",
535 cls, con, tag, end, *end));
536 return 0;
537 }
539 while (!asn1_eoc_decode(&ctx, sequence_end)) {
540 rc = asn1_header_decode(&ctx, &end, &cls, &con, &tag);
541 if (!rc) {
542 cFYI(1,
543 ("Error 1 decoding negTokenInit header exit 2"));
544 return 0;
545 }
546 if ((tag == ASN1_OJI) && (con == ASN1_PRI)) {
547 rc = asn1_oid_decode(&ctx, end, &oid, &oidlen);
548 if(rc) {
549 cFYI(1,
550 ("OID len = %d oid = 0x%lx 0x%lx 0x%lx 0x%lx",
551 oidlen, *oid, *(oid + 1), *(oid + 2),
552 *(oid + 3)));
553 rc = compare_oid(oid, oidlen, NTLMSSP_OID,
554 NTLMSSP_OID_LEN);
555 kfree(oid);
556 if (rc)
557 use_ntlmssp = TRUE;
558 }
559 } else {
560 cFYI(1,("This should be an oid what is going on? "));
561 }
562 }
564 if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
565 cFYI(1,
566 ("Error decoding last part of negTokenInit exit 3"));
567 return 0;
568 } else if ((cls != ASN1_CTX) || (con != ASN1_CON)) { /* tag = 3 indicating mechListMIC */
569 cFYI(1,
570 ("Exit 4 cls = %d con = %d tag = %d end = %p (%d)",
571 cls, con, tag, end, *end));
572 return 0;
573 }
574 if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
575 cFYI(1,
576 ("Error decoding last part of negTokenInit exit 5"));
577 return 0;
578 } else if ((cls != ASN1_UNI) || (con != ASN1_CON)
579 || (tag != ASN1_SEQ)) {
580 cFYI(1,
581 ("Exit 6 cls = %d con = %d tag = %d end = %p (%d)",
582 cls, con, tag, end, *end));
583 }
585 if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
586 cFYI(1,
587 ("Error decoding last part of negTokenInit exit 7"));
588 return 0;
589 } else if ((cls != ASN1_CTX) || (con != ASN1_CON)) {
590 cFYI(1,
591 ("Exit 8 cls = %d con = %d tag = %d end = %p (%d)",
592 cls, con, tag, end, *end));
593 return 0;
594 }
595 if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
596 cFYI(1,
597 ("Error decoding last part of negTokenInit exit 9"));
598 return 0;
599 } else if ((cls != ASN1_UNI) || (con != ASN1_PRI)
600 || (tag != ASN1_GENSTR)) {
601 cFYI(1,
602 ("Exit 10 cls = %d con = %d tag = %d end = %p (%d)",
603 cls, con, tag, end, *end));
604 return 0;
605 }
606 cFYI(1, ("Need to call asn1_octets_decode() function for this %s", ctx.pointer)); /* is this UTF-8 or ASCII? */
607 }
609 /* if (use_kerberos)
610 *secType = Kerberos
611 else */
612 if (use_ntlmssp) {
613 *secType = NTLMSSP;
614 }
616 return 1;
617 }