asn1_lib.c revision 296465 
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                           int 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, (int)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                           int max)
163{
164    const unsigned char *p = *pp;
165    unsigned long ret = 0;
166    unsigned int 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(long))
179                return 0;
180            if (max-- == 0)
181                return (0);
182            while (i-- > 0) {
183                ret <<= 8L;
184                ret |= *(p++);
185                if (max-- == 0)
186                    return (0);
187            }
188        } else
189            ret = i;
190    }
191    if (ret > LONG_MAX)
192        return 0;
193    *pp = p;
194    *rl = (long)ret;
195    return (1);
196}
197
198/*
199 * class 0 is constructed constructed == 2 for indefinite length constructed
200 */
201void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
202                     int xclass)
203{
204    unsigned char *p = *pp;
205    int i, ttag;
206
207    i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
208    i |= (xclass & V_ASN1_PRIVATE);
209    if (tag < 31)
210        *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG);
211    else {
212        *(p++) = i | V_ASN1_PRIMITIVE_TAG;
213        for (i = 0, ttag = tag; ttag > 0; i++)
214            ttag >>= 7;
215        ttag = i;
216        while (i-- > 0) {
217            p[i] = tag & 0x7f;
218            if (i != (ttag - 1))
219                p[i] |= 0x80;
220            tag >>= 7;
221        }
222        p += ttag;
223    }
224    if (constructed == 2)
225        *(p++) = 0x80;
226    else
227        asn1_put_length(&p, length);
228    *pp = p;
229}
230
231int ASN1_put_eoc(unsigned char **pp)
232{
233    unsigned char *p = *pp;
234    *p++ = 0;
235    *p++ = 0;
236    *pp = p;
237    return 2;
238}
239
240static void asn1_put_length(unsigned char **pp, int length)
241{
242    unsigned char *p = *pp;
243    int i, l;
244    if (length <= 127)
245        *(p++) = (unsigned char)length;
246    else {
247        l = length;
248        for (i = 0; l > 0; i++)
249            l >>= 8;
250        *(p++) = i | 0x80;
251        l = i;
252        while (i-- > 0) {
253            p[i] = length & 0xff;
254            length >>= 8;
255        }
256        p += l;
257    }
258    *pp = p;
259}
260
261int ASN1_object_size(int constructed, int length, int tag)
262{
263    int ret;
264
265    ret = length;
266    ret++;
267    if (tag >= 31) {
268        while (tag > 0) {
269            tag >>= 7;
270            ret++;
271        }
272    }
273    if (constructed == 2)
274        return ret + 3;
275    ret++;
276    if (length > 127) {
277        while (length > 0) {
278            length >>= 8;
279            ret++;
280        }
281    }
282    return (ret);
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 + *(c->pp) - c->p;
332    c->eos = 0;
333    return (1);
334}
335
336ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str)
337{
338    ASN1_STRING *ret;
339
340    if (str == NULL)
341        return (NULL);
342    if ((ret = ASN1_STRING_type_new(str->type)) == NULL)
343        return (NULL);
344    if (!ASN1_STRING_set(ret, str->data, str->length)) {
345        ASN1_STRING_free(ret);
346        return (NULL);
347    }
348    ret->flags = str->flags;
349    return (ret);
350}
351
352int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
353{
354    unsigned char *c;
355    const char *data = _data;
356
357    if (len < 0) {
358        if (data == NULL)
359            return (0);
360        else
361            len = strlen(data);
362    }
363    if ((str->length < len) || (str->data == NULL)) {
364        c = str->data;
365        if (c == NULL)
366            str->data = OPENSSL_malloc(len + 1);
367        else
368            str->data = OPENSSL_realloc(c, len + 1);
369
370        if (str->data == NULL) {
371            ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE);
372            str->data = c;
373            return (0);
374        }
375    }
376    str->length = len;
377    if (data != NULL) {
378        memcpy(str->data, data, len);
379        /* an allowance for strings :-) */
380        str->data[len] = '\0';
381    }
382    return (1);
383}
384
385void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
386{
387    if (str->data)
388        OPENSSL_free(str->data);
389    str->data = data;
390    str->length = len;
391}
392
393ASN1_STRING *ASN1_STRING_new(void)
394{
395    return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
396}
397
398ASN1_STRING *ASN1_STRING_type_new(int type)
399{
400    ASN1_STRING *ret;
401
402    ret = (ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
403    if (ret == NULL) {
404        ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE);
405        return (NULL);
406    }
407    ret->length = 0;
408    ret->type = type;
409    ret->data = NULL;
410    ret->flags = 0;
411    return (ret);
412}
413
414void ASN1_STRING_free(ASN1_STRING *a)
415{
416    if (a == NULL)
417        return;
418    if (a->data != NULL)
419        OPENSSL_free(a->data);
420    OPENSSL_free(a);
421}
422
423int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b)
424{
425    int i;
426
427    i = (a->length - b->length);
428    if (i == 0) {
429        i = memcmp(a->data, b->data, a->length);
430        if (i == 0)
431            return (a->type - b->type);
432        else
433            return (i);
434    } else
435        return (i);
436}
437
438void asn1_add_error(const unsigned char *address, int offset)
439{
440    char buf1[DECIMAL_SIZE(address) + 1], buf2[DECIMAL_SIZE(offset) + 1];
441
442    BIO_snprintf(buf1, sizeof buf1, "%lu", (unsigned long)address);
443    BIO_snprintf(buf2, sizeof buf2, "%d", offset);
444    ERR_add_error_data(4, "address=", buf1, " offset=", buf2);
445}
446
447int ASN1_STRING_length(ASN1_STRING *x)
448{
449    return M_ASN1_STRING_length(x);
450}
451
452void ASN1_STRING_length_set(ASN1_STRING *x, int len)
453{
454    M_ASN1_STRING_length_set(x, len);
455    return;
456}
457
458int ASN1_STRING_type(ASN1_STRING *x)
459{
460    return M_ASN1_STRING_type(x);
461}
462
463unsigned char *ASN1_STRING_data(ASN1_STRING *x)
464{
465    return M_ASN1_STRING_data(x);
466}
467