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1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2  * All rights reserved.
3  *
4  * This package is an SSL implementation written
5  * by Eric Young (eay@cryptsoft.com).
6  * The implementation was written so as to conform with Netscapes SSL.
7  *
8  * This library is free for commercial and non-commercial use as long as
9  * the following conditions are aheared to.  The following conditions
10  * apply to all code found in this distribution, be it the RC4, RSA,
11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
12  * included with this distribution is covered by the same copyright terms
13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14  *
15  * Copyright remains Eric Young's, and as such any Copyright notices in
16  * the code are not to be removed.
17  * If this package is used in a product, Eric Young should be given attribution
18  * as the author of the parts of the library used.
19  * This can be in the form of a textual message at program startup or
20  * in documentation (online or textual) provided with the package.
21  *
22  * Redistribution and use in source and binary forms, with or without
23  * modification, are permitted provided that the following conditions
24  * are met:
25  * 1. Redistributions of source code must retain the copyright
26  *    notice, this list of conditions and the following disclaimer.
27  * 2. Redistributions in binary form must reproduce the above copyright
28  *    notice, this list of conditions and the following disclaimer in the
29  *    documentation and/or other materials provided with the distribution.
30  * 3. All advertising materials mentioning features or use of this software
31  *    must display the following acknowledgement:
32  *    "This product includes cryptographic software written by
33  *     Eric Young (eay@cryptsoft.com)"
34  *    The word 'cryptographic' can be left out if the rouines from the library
35  *    being used are not cryptographic related :-).
36  * 4. If you include any Windows specific code (or a derivative thereof) from
37  *    the apps directory (application code) you must include an acknowledgement:
38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39  *
40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50  * SUCH DAMAGE.
51  *
52  * The licence and distribution terms for any publically available version or
53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
54  * copied and put under another distribution licence
55  * [including the GNU Public Licence.] */
56 
57 #include <openssl/asn1.h>
58 
59 #include <limits.h>
60 #include <string.h>
61 
62 #include <openssl/asn1_mac.h>
63 #include <openssl/err.h>
64 #include <openssl/mem.h>
65 
66 #include "../internal.h"
67 
68 
69 /* Cross-module errors from crypto/x509/i2d_pr.c. */
70 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNSUPPORTED_PUBLIC_KEY_TYPE)
71 
72 /* Cross-module errors from crypto/x509/algorithm.c. */
73 OPENSSL_DECLARE_ERROR_REASON(ASN1, CONTEXT_NOT_INITIALISED)
74 OPENSSL_DECLARE_ERROR_REASON(ASN1, DIGEST_AND_KEY_TYPE_NOT_SUPPORTED)
75 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_MESSAGE_DIGEST_ALGORITHM)
76 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_SIGNATURE_ALGORITHM)
77 OPENSSL_DECLARE_ERROR_REASON(ASN1, WRONG_PUBLIC_KEY_TYPE)
78 /*
79  * Cross-module errors from crypto/x509/asn1_gen.c. TODO(davidben): Remove
80  * these once asn1_gen.c is gone.
81  */
82 OPENSSL_DECLARE_ERROR_REASON(ASN1, DEPTH_EXCEEDED)
83 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_BITSTRING_FORMAT)
84 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_BOOLEAN)
85 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_FORMAT)
86 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_HEX)
87 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_IMPLICIT_TAG)
88 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_INTEGER)
89 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_NESTED_TAGGING)
90 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_NULL_VALUE)
91 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_OBJECT)
92 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_TIME_VALUE)
93 OPENSSL_DECLARE_ERROR_REASON(ASN1, INTEGER_NOT_ASCII_FORMAT)
94 OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_MODIFIER)
95 OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_NUMBER)
96 OPENSSL_DECLARE_ERROR_REASON(ASN1, LIST_ERROR)
97 OPENSSL_DECLARE_ERROR_REASON(ASN1, MISSING_VALUE)
98 OPENSSL_DECLARE_ERROR_REASON(ASN1, NOT_ASCII_FORMAT)
99 OPENSSL_DECLARE_ERROR_REASON(ASN1, OBJECT_NOT_ASCII_FORMAT)
100 OPENSSL_DECLARE_ERROR_REASON(ASN1, SEQUENCE_OR_SET_NEEDS_CONFIG)
101 OPENSSL_DECLARE_ERROR_REASON(ASN1, TIME_NOT_ASCII_FORMAT)
102 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_FORMAT)
103 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_TAG)
104 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNSUPPORTED_TYPE)
105 
106 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
107                            long max);
108 static void asn1_put_length(unsigned char **pp, int length);
109 
ASN1_get_object(const unsigned char ** pp,long * plength,int * ptag,int * pclass,long omax)110 int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
111                     int *pclass, long omax)
112 {
113     int i, ret;
114     long l;
115     const unsigned char *p = *pp;
116     int tag, xclass, inf;
117     long max = omax;
118 
119     if (!max)
120         goto err;
121     ret = (*p & V_ASN1_CONSTRUCTED);
122     xclass = (*p & V_ASN1_PRIVATE);
123     i = *p & V_ASN1_PRIMITIVE_TAG;
124     if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */
125         p++;
126         if (--max == 0)
127             goto err;
128         l = 0;
129         while (*p & 0x80) {
130             l <<= 7L;
131             l |= *(p++) & 0x7f;
132             if (--max == 0)
133                 goto err;
134             if (l > (INT_MAX >> 7L))
135                 goto err;
136         }
137         l <<= 7L;
138         l |= *(p++) & 0x7f;
139         tag = (int)l;
140         if (--max == 0)
141             goto err;
142     } else {
143         tag = i;
144         p++;
145         if (--max == 0)
146             goto err;
147     }
148 
149     /* To avoid ambiguity with V_ASN1_NEG, impose a limit on universal tags. */
150     if (xclass == V_ASN1_UNIVERSAL && tag > V_ASN1_MAX_UNIVERSAL)
151         goto err;
152 
153     *ptag = tag;
154     *pclass = xclass;
155     if (!asn1_get_length(&p, &inf, plength, max))
156         goto err;
157 
158     if (inf && !(ret & V_ASN1_CONSTRUCTED))
159         goto err;
160 
161 #if 0
162     fprintf(stderr, "p=%d + *plength=%ld > omax=%ld + *pp=%d  (%d > %d)\n",
163             (int)p, *plength, omax, (int)*pp, (int)(p + *plength),
164             (int)(omax + *pp));
165 
166 #endif
167     if (*plength > (omax - (p - *pp))) {
168         OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
169         /*
170          * Set this so that even if things are not long enough the values are
171          * set correctly
172          */
173         ret |= 0x80;
174     }
175     *pp = p;
176     return (ret | inf);
177  err:
178     OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG);
179     return (0x80);
180 }
181 
asn1_get_length(const unsigned char ** pp,int * inf,long * rl,long max)182 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
183                            long max)
184 {
185     const unsigned char *p = *pp;
186     unsigned long ret = 0;
187     unsigned long i;
188 
189     if (max-- < 1)
190         return 0;
191     if (*p == 0x80) {
192         *inf = 1;
193         ret = 0;
194         p++;
195     } else {
196         *inf = 0;
197         i = *p & 0x7f;
198         if (*(p++) & 0x80) {
199             if (i > sizeof(ret) || max < (long)i)
200                 return 0;
201             while (i-- > 0) {
202                 ret <<= 8L;
203                 ret |= *(p++);
204             }
205         } else
206             ret = i;
207     }
208     if (ret > LONG_MAX)
209         return 0;
210     *pp = p;
211     *rl = (long)ret;
212     return 1;
213 }
214 
215 /*
216  * class 0 is constructed constructed == 2 for indefinite length constructed
217  */
ASN1_put_object(unsigned char ** pp,int constructed,int length,int tag,int xclass)218 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
219                      int xclass)
220 {
221     unsigned char *p = *pp;
222     int i, ttag;
223 
224     i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
225     i |= (xclass & V_ASN1_PRIVATE);
226     if (tag < 31)
227         *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG);
228     else {
229         *(p++) = i | V_ASN1_PRIMITIVE_TAG;
230         for (i = 0, ttag = tag; ttag > 0; i++)
231             ttag >>= 7;
232         ttag = i;
233         while (i-- > 0) {
234             p[i] = tag & 0x7f;
235             if (i != (ttag - 1))
236                 p[i] |= 0x80;
237             tag >>= 7;
238         }
239         p += ttag;
240     }
241     if (constructed == 2)
242         *(p++) = 0x80;
243     else
244         asn1_put_length(&p, length);
245     *pp = p;
246 }
247 
ASN1_put_eoc(unsigned char ** pp)248 int ASN1_put_eoc(unsigned char **pp)
249 {
250     unsigned char *p = *pp;
251     *p++ = 0;
252     *p++ = 0;
253     *pp = p;
254     return 2;
255 }
256 
asn1_put_length(unsigned char ** pp,int length)257 static void asn1_put_length(unsigned char **pp, int length)
258 {
259     unsigned char *p = *pp;
260     int i, l;
261     if (length <= 127)
262         *(p++) = (unsigned char)length;
263     else {
264         l = length;
265         for (i = 0; l > 0; i++)
266             l >>= 8;
267         *(p++) = i | 0x80;
268         l = i;
269         while (i-- > 0) {
270             p[i] = length & 0xff;
271             length >>= 8;
272         }
273         p += l;
274     }
275     *pp = p;
276 }
277 
ASN1_object_size(int constructed,int length,int tag)278 int ASN1_object_size(int constructed, int length, int tag)
279 {
280     int ret = 1;
281     if (length < 0)
282         return -1;
283     if (tag >= 31) {
284         while (tag > 0) {
285             tag >>= 7;
286             ret++;
287         }
288     }
289     if (constructed == 2) {
290         ret += 3;
291     } else {
292         ret++;
293         if (length > 127) {
294             int tmplen = length;
295             while (tmplen > 0) {
296                 tmplen >>= 8;
297                 ret++;
298             }
299         }
300     }
301     if (ret >= INT_MAX - length)
302         return -1;
303     return ret + length;
304 }
305 
ASN1_STRING_copy(ASN1_STRING * dst,const ASN1_STRING * str)306 int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
307 {
308     if (str == NULL)
309         return 0;
310     dst->type = str->type;
311     if (!ASN1_STRING_set(dst, str->data, str->length))
312         return 0;
313     dst->flags = str->flags;
314     return 1;
315 }
316 
ASN1_STRING_dup(const ASN1_STRING * str)317 ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
318 {
319     ASN1_STRING *ret;
320     if (!str)
321         return NULL;
322     ret = ASN1_STRING_new();
323     if (!ret)
324         return NULL;
325     if (!ASN1_STRING_copy(ret, str)) {
326         ASN1_STRING_free(ret);
327         return NULL;
328     }
329     return ret;
330 }
331 
ASN1_STRING_set(ASN1_STRING * str,const void * _data,int len)332 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
333 {
334     unsigned char *c;
335     const char *data = _data;
336 
337     if (len < 0) {
338         if (data == NULL)
339             return (0);
340         else
341             len = strlen(data);
342     }
343     if ((str->length <= len) || (str->data == NULL)) {
344         c = str->data;
345         if (c == NULL)
346             str->data = OPENSSL_malloc(len + 1);
347         else
348             str->data = OPENSSL_realloc(c, len + 1);
349 
350         if (str->data == NULL) {
351             OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
352             str->data = c;
353             return (0);
354         }
355     }
356     str->length = len;
357     if (data != NULL) {
358         OPENSSL_memcpy(str->data, data, len);
359         /* an allowance for strings :-) */
360         str->data[len] = '\0';
361     }
362     return (1);
363 }
364 
ASN1_STRING_set0(ASN1_STRING * str,void * data,int len)365 void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
366 {
367     if (str->data)
368         OPENSSL_free(str->data);
369     str->data = data;
370     str->length = len;
371 }
372 
ASN1_STRING_new(void)373 ASN1_STRING *ASN1_STRING_new(void)
374 {
375     return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
376 }
377 
ASN1_STRING_type_new(int type)378 ASN1_STRING *ASN1_STRING_type_new(int type)
379 {
380     ASN1_STRING *ret;
381 
382     ret = (ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
383     if (ret == NULL) {
384         OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
385         return (NULL);
386     }
387     ret->length = 0;
388     ret->type = type;
389     ret->data = NULL;
390     ret->flags = 0;
391     return (ret);
392 }
393 
ASN1_STRING_free(ASN1_STRING * a)394 void ASN1_STRING_free(ASN1_STRING *a)
395 {
396     if (a == NULL)
397         return;
398     if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
399         OPENSSL_free(a->data);
400     OPENSSL_free(a);
401 }
402 
ASN1_STRING_cmp(const ASN1_STRING * a,const ASN1_STRING * b)403 int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
404 {
405     int i;
406 
407     i = (a->length - b->length);
408     if (i == 0) {
409         i = OPENSSL_memcmp(a->data, b->data, a->length);
410         if (i == 0)
411             return (a->type - b->type);
412         else
413             return (i);
414     } else
415         return (i);
416 }
417 
ASN1_STRING_length(const ASN1_STRING * x)418 int ASN1_STRING_length(const ASN1_STRING *x)
419 {
420     return M_ASN1_STRING_length(x);
421 }
422 
ASN1_STRING_length_set(ASN1_STRING * x,int len)423 void ASN1_STRING_length_set(ASN1_STRING *x, int len)
424 {
425     M_ASN1_STRING_length_set(x, len);
426     return;
427 }
428 
ASN1_STRING_type(ASN1_STRING * x)429 int ASN1_STRING_type(ASN1_STRING *x)
430 {
431     return M_ASN1_STRING_type(x);
432 }
433 
ASN1_STRING_data(ASN1_STRING * x)434 unsigned char *ASN1_STRING_data(ASN1_STRING *x)
435 {
436     return M_ASN1_STRING_data(x);
437 }
438