asn1_lib.c revision 331638 
1/* crypto/asn1/asn1_lib.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to.  The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 *    notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in the
30 *    documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 *    must display the following acknowledgement:
33 *    "This product includes cryptographic software written by
34 *     Eric Young (eay@cryptsoft.com)"
35 *    The word 'cryptographic' can be left out if the rouines from the library
36 *    being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 *    the apps directory (application code) you must include an acknowledgement:
39 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#include <stdio.h>
60#include <limits.h>
61#include "cryptlib.h"
62#include <openssl/asn1.h>
63#include <openssl/asn1_mac.h>
64
65static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
66                           long max);
67static void asn1_put_length(unsigned char **pp, int length);
68const char ASN1_version[] = "ASN.1" OPENSSL_VERSION_PTEXT;
69
70static int _asn1_check_infinite_end(const unsigned char **p, long len)
71{
72    /*
73     * If there is 0 or 1 byte left, the length check should pick things up
74     */
75    if (len <= 0)
76        return (1);
77    else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) {
78        (*p) += 2;
79        return (1);
80    }
81    return (0);
82}
83
84int ASN1_check_infinite_end(unsigned char **p, long len)
85{
86    return _asn1_check_infinite_end((const unsigned char **)p, len);
87}
88
89int ASN1_const_check_infinite_end(const unsigned char **p, long len)
90{
91    return _asn1_check_infinite_end(p, len);
92}
93
94int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
95                    int *pclass, long omax)
96{
97    int i, ret;
98    long l;
99    const unsigned char *p = *pp;
100    int tag, xclass, inf;
101    long max = omax;
102
103    if (!max)
104        goto err;
105    ret = (*p & V_ASN1_CONSTRUCTED);
106    xclass = (*p & V_ASN1_PRIVATE);
107    i = *p & V_ASN1_PRIMITIVE_TAG;
108    if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */
109        p++;
110        if (--max == 0)
111            goto err;
112        l = 0;
113        while (*p & 0x80) {
114            l <<= 7L;
115            l |= *(p++) & 0x7f;
116            if (--max == 0)
117                goto err;
118            if (l > (INT_MAX >> 7L))
119                goto err;
120        }
121        l <<= 7L;
122        l |= *(p++) & 0x7f;
123        tag = (int)l;
124        if (--max == 0)
125            goto err;
126    } else {
127        tag = i;
128        p++;
129        if (--max == 0)
130            goto err;
131    }
132    *ptag = tag;
133    *pclass = xclass;
134    if (!asn1_get_length(&p, &inf, plength, max))
135        goto err;
136
137    if (inf && !(ret & V_ASN1_CONSTRUCTED))
138        goto err;
139
140#if 0
141    fprintf(stderr, "p=%d + *plength=%ld > omax=%ld + *pp=%d  (%d > %d)\n",
142            (int)p, *plength, omax, (int)*pp, (int)(p + *plength),
143            (int)(omax + *pp));
144
145#endif
146    if (*plength > (omax - (p - *pp))) {
147        ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_TOO_LONG);
148        /*
149         * Set this so that even if things are not long enough the values are
150         * set correctly
151         */
152        ret |= 0x80;
153    }
154    *pp = p;
155    return (ret | inf);
156 err:
157    ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_HEADER_TOO_LONG);
158    return (0x80);
159}
160
161static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
162                           long max)
163{
164    const unsigned char *p = *pp;
165    unsigned long ret = 0;
166    unsigned long i;
167
168    if (max-- < 1)
169        return 0;
170    if (*p == 0x80) {
171        *inf = 1;
172        ret = 0;
173        p++;
174    } else {
175        *inf = 0;
176        i = *p & 0x7f;
177        if (*(p++) & 0x80) {
178            if (i > sizeof(ret) || max < (long)i)
179                return 0;
180            while (i-- > 0) {
181                ret <<= 8L;
182                ret |= *(p++);
183            }
184        } else
185            ret = i;
186    }
187    if (ret > LONG_MAX)
188        return 0;
189    *pp = p;
190    *rl = (long)ret;
191    return 1;
192}
193
194/*
195 * class 0 is constructed constructed == 2 for indefinite length constructed
196 */
197void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
198                     int xclass)
199{
200    unsigned char *p = *pp;
201    int i, ttag;
202
203    i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
204    i |= (xclass & V_ASN1_PRIVATE);
205    if (tag < 31)
206        *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG);
207    else {
208        *(p++) = i | V_ASN1_PRIMITIVE_TAG;
209        for (i = 0, ttag = tag; ttag > 0; i++)
210            ttag >>= 7;
211        ttag = i;
212        while (i-- > 0) {
213            p[i] = tag & 0x7f;
214            if (i != (ttag - 1))
215                p[i] |= 0x80;
216            tag >>= 7;
217        }
218        p += ttag;
219    }
220    if (constructed == 2)
221        *(p++) = 0x80;
222    else
223        asn1_put_length(&p, length);
224    *pp = p;
225}
226
227int ASN1_put_eoc(unsigned char **pp)
228{
229    unsigned char *p = *pp;
230    *p++ = 0;
231    *p++ = 0;
232    *pp = p;
233    return 2;
234}
235
236static void asn1_put_length(unsigned char **pp, int length)
237{
238    unsigned char *p = *pp;
239    int i, l;
240    if (length <= 127)
241        *(p++) = (unsigned char)length;
242    else {
243        l = length;
244        for (i = 0; l > 0; i++)
245            l >>= 8;
246        *(p++) = i | 0x80;
247        l = i;
248        while (i-- > 0) {
249            p[i] = length & 0xff;
250            length >>= 8;
251        }
252        p += l;
253    }
254    *pp = p;
255}
256
257int ASN1_object_size(int constructed, int length, int tag)
258{
259    int ret = 1;
260    if (length < 0)
261        return -1;
262    if (tag >= 31) {
263        while (tag > 0) {
264            tag >>= 7;
265            ret++;
266        }
267    }
268    if (constructed == 2) {
269        ret += 3;
270    } else {
271        ret++;
272        if (length > 127) {
273            int tmplen = length;
274            while (tmplen > 0) {
275                tmplen >>= 8;
276                ret++;
277            }
278        }
279    }
280    if (ret >= INT_MAX - length)
281        return -1;
282    return ret + length;
283}
284
285static int _asn1_Finish(ASN1_const_CTX *c)
286{
287    if ((c->inf == (1 | V_ASN1_CONSTRUCTED)) && (!c->eos)) {
288        if (!ASN1_const_check_infinite_end(&c->p, c->slen)) {
289            c->error = ERR_R_MISSING_ASN1_EOS;
290            return (0);
291        }
292    }
293    if (((c->slen != 0) && !(c->inf & 1)) || ((c->slen < 0) && (c->inf & 1))) {
294        c->error = ERR_R_ASN1_LENGTH_MISMATCH;
295        return (0);
296    }
297    return (1);
298}
299
300int asn1_Finish(ASN1_CTX *c)
301{
302    return _asn1_Finish((ASN1_const_CTX *)c);
303}
304
305int asn1_const_Finish(ASN1_const_CTX *c)
306{
307    return _asn1_Finish(c);
308}
309
310int asn1_GetSequence(ASN1_const_CTX *c, long *length)
311{
312    const unsigned char *q;
313
314    q = c->p;
315    c->inf = ASN1_get_object(&(c->p), &(c->slen), &(c->tag), &(c->xclass),
316                             *length);
317    if (c->inf & 0x80) {
318        c->error = ERR_R_BAD_GET_ASN1_OBJECT_CALL;
319        return (0);
320    }
321    if (c->tag != V_ASN1_SEQUENCE) {
322        c->error = ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
323        return (0);
324    }
325    (*length) -= (c->p - q);
326    if (c->max && (*length < 0)) {
327        c->error = ERR_R_ASN1_LENGTH_MISMATCH;
328        return (0);
329    }
330    if (c->inf == (1 | V_ASN1_CONSTRUCTED))
331        c->slen = *length;
332    c->eos = 0;
333    return (1);
334}
335
336int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
337{
338    if (str == NULL)
339        return 0;
340    dst->type = str->type;
341    if (!ASN1_STRING_set(dst, str->data, str->length))
342        return 0;
343    dst->flags = str->flags;
344    return 1;
345}
346
347ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
348{
349    ASN1_STRING *ret;
350    if (!str)
351        return NULL;
352    ret = ASN1_STRING_new();
353    if (!ret)
354        return NULL;
355    if (!ASN1_STRING_copy(ret, str)) {
356        ASN1_STRING_free(ret);
357        return NULL;
358    }
359    return ret;
360}
361
362int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
363{
364    unsigned char *c;
365    const char *data = _data;
366
367    if (len < 0) {
368        if (data == NULL)
369            return (0);
370        else
371            len = strlen(data);
372    }
373    if ((str->length <= len) || (str->data == NULL)) {
374        c = str->data;
375        if (c == NULL)
376            str->data = OPENSSL_malloc(len + 1);
377        else
378            str->data = OPENSSL_realloc(c, len + 1);
379
380        if (str->data == NULL) {
381            ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE);
382            str->data = c;
383            return (0);
384        }
385    }
386    str->length = len;
387    if (data != NULL) {
388        memcpy(str->data, data, len);
389        /* an allowance for strings :-) */
390        str->data[len] = '\0';
391    }
392    return (1);
393}
394
395void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
396{
397    if (str->data)
398        OPENSSL_free(str->data);
399    str->data = data;
400    str->length = len;
401}
402
403ASN1_STRING *ASN1_STRING_new(void)
404{
405    return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
406}
407
408ASN1_STRING *ASN1_STRING_type_new(int type)
409{
410    ASN1_STRING *ret;
411
412    ret = (ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
413    if (ret == NULL) {
414        ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE);
415        return (NULL);
416    }
417    ret->length = 0;
418    ret->type = type;
419    ret->data = NULL;
420    ret->flags = 0;
421    return (ret);
422}
423
424void ASN1_STRING_free(ASN1_STRING *a)
425{
426    if (a == NULL)
427        return;
428    if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
429        OPENSSL_free(a->data);
430    OPENSSL_free(a);
431}
432
433void ASN1_STRING_clear_free(ASN1_STRING *a)
434{
435    if (a && a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
436        OPENSSL_cleanse(a->data, a->length);
437    ASN1_STRING_free(a);
438}
439
440int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
441{
442    int i;
443
444    i = (a->length - b->length);
445    if (i == 0) {
446        i = memcmp(a->data, b->data, a->length);
447        if (i == 0)
448            return (a->type - b->type);
449        else
450            return (i);
451    } else
452        return (i);
453}
454
455void asn1_add_error(const unsigned char *address, int offset)
456{
457    char buf1[DECIMAL_SIZE(address) + 1], buf2[DECIMAL_SIZE(offset) + 1];
458
459    BIO_snprintf(buf1, sizeof(buf1), "%lu", (unsigned long)address);
460    BIO_snprintf(buf2, sizeof(buf2), "%d", offset);
461    ERR_add_error_data(4, "address=", buf1, " offset=", buf2);
462}
463
464int ASN1_STRING_length(const ASN1_STRING *x)
465{
466    return M_ASN1_STRING_length(x);
467}
468
469void ASN1_STRING_length_set(ASN1_STRING *x, int len)
470{
471    M_ASN1_STRING_length_set(x, len);
472    return;
473}
474
475int ASN1_STRING_type(ASN1_STRING *x)
476{
477    return M_ASN1_STRING_type(x);
478}
479
480unsigned char *ASN1_STRING_data(ASN1_STRING *x)
481{
482    return M_ASN1_STRING_data(x);
483}
484