asn1_par.c revision 291721 
1/* crypto/asn1/asn1_par.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 "cryptlib.h"
61#include <openssl/buffer.h>
62#include <openssl/objects.h>
63#include <openssl/asn1.h>
64
65#ifndef ASN1_PARSE_MAXDEPTH
66#define ASN1_PARSE_MAXDEPTH 128
67#endif
68
69static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
70                           int indent);
71static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
72                       int offset, int depth, int indent, int dump);
73static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
74                           int indent)
75{
76    static const char fmt[] = "%-18s";
77    char str[128];
78    const char *p;
79
80    if (constructed & V_ASN1_CONSTRUCTED)
81        p = "cons: ";
82    else
83        p = "prim: ";
84    if (BIO_write(bp, p, 6) < 6)
85        goto err;
86    BIO_indent(bp, indent, 128);
87
88    p = str;
89    if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE)
90        BIO_snprintf(str, sizeof str, "priv [ %d ] ", tag);
91    else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC)
92        BIO_snprintf(str, sizeof str, "cont [ %d ]", tag);
93    else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION)
94        BIO_snprintf(str, sizeof str, "appl [ %d ]", tag);
95    else if (tag > 30)
96        BIO_snprintf(str, sizeof str, "<ASN1 %d>", tag);
97    else
98        p = ASN1_tag2str(tag);
99
100    if (BIO_printf(bp, fmt, p) <= 0)
101        goto err;
102    return (1);
103 err:
104    return (0);
105}
106
107int ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent)
108{
109    return (asn1_parse2(bp, &pp, len, 0, 0, indent, 0));
110}
111
112int ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent,
113                    int dump)
114{
115    return (asn1_parse2(bp, &pp, len, 0, 0, indent, dump));
116}
117
118static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
119                       int offset, int depth, int indent, int dump)
120{
121    const unsigned char *p, *ep, *tot, *op, *opp;
122    long len;
123    int tag, xclass, ret = 0;
124    int nl, hl, j, r;
125    ASN1_OBJECT *o = NULL;
126    ASN1_OCTET_STRING *os = NULL;
127    /* ASN1_BMPSTRING *bmp=NULL; */
128    int dump_indent;
129
130#if 0
131    dump_indent = indent;
132#else
133    dump_indent = 6;            /* Because we know BIO_dump_indent() */
134#endif
135
136    if (depth > ASN1_PARSE_MAXDEPTH) {
137            BIO_puts(bp, "BAD RECURSION DEPTH\n");
138            return 0;
139    }
140
141    p = *pp;
142    tot = p + length;
143    op = p - 1;
144    while ((p < tot) && (op < p)) {
145        op = p;
146        j = ASN1_get_object(&p, &len, &tag, &xclass, length);
147#ifdef LINT
148        j = j;
149#endif
150        if (j & 0x80) {
151            if (BIO_write(bp, "Error in encoding\n", 18) <= 0)
152                goto end;
153            ret = 0;
154            goto end;
155        }
156        hl = (p - op);
157        length -= hl;
158        /*
159         * if j == 0x21 it is a constructed indefinite length object
160         */
161        if (BIO_printf(bp, "%5ld:", (long)offset + (long)(op - *pp))
162            <= 0)
163            goto end;
164
165        if (j != (V_ASN1_CONSTRUCTED | 1)) {
166            if (BIO_printf(bp, "d=%-2d hl=%ld l=%4ld ",
167                           depth, (long)hl, len) <= 0)
168                goto end;
169        } else {
170            if (BIO_printf(bp, "d=%-2d hl=%ld l=inf  ", depth, (long)hl) <= 0)
171                goto end;
172        }
173        if (!asn1_print_info(bp, tag, xclass, j, (indent) ? depth : 0))
174            goto end;
175        if (j & V_ASN1_CONSTRUCTED) {
176            ep = p + len;
177            if (BIO_write(bp, "\n", 1) <= 0)
178                goto end;
179            if (len > length) {
180                BIO_printf(bp, "length is greater than %ld\n", length);
181                ret = 0;
182                goto end;
183            }
184            if ((j == 0x21) && (len == 0)) {
185                for (;;) {
186                    r = asn1_parse2(bp, &p, (long)(tot - p),
187                                    offset + (p - *pp), depth + 1,
188                                    indent, dump);
189                    if (r == 0) {
190                        ret = 0;
191                        goto end;
192                    }
193                    if ((r == 2) || (p >= tot))
194                        break;
195                }
196            } else
197                while (p < ep) {
198                    r = asn1_parse2(bp, &p, (long)len,
199                                    offset + (p - *pp), depth + 1,
200                                    indent, dump);
201                    if (r == 0) {
202                        ret = 0;
203                        goto end;
204                    }
205                }
206        } else if (xclass != 0) {
207            p += len;
208            if (BIO_write(bp, "\n", 1) <= 0)
209                goto end;
210        } else {
211            nl = 0;
212            if ((tag == V_ASN1_PRINTABLESTRING) ||
213                (tag == V_ASN1_T61STRING) ||
214                (tag == V_ASN1_IA5STRING) ||
215                (tag == V_ASN1_VISIBLESTRING) ||
216                (tag == V_ASN1_NUMERICSTRING) ||
217                (tag == V_ASN1_UTF8STRING) ||
218                (tag == V_ASN1_UTCTIME) || (tag == V_ASN1_GENERALIZEDTIME)) {
219                if (BIO_write(bp, ":", 1) <= 0)
220                    goto end;
221                if ((len > 0) && BIO_write(bp, (const char *)p, (int)len)
222                    != (int)len)
223                    goto end;
224            } else if (tag == V_ASN1_OBJECT) {
225                opp = op;
226                if (d2i_ASN1_OBJECT(&o, &opp, len + hl) != NULL) {
227                    if (BIO_write(bp, ":", 1) <= 0)
228                        goto end;
229                    i2a_ASN1_OBJECT(bp, o);
230                } else {
231                    if (BIO_write(bp, ":BAD OBJECT", 11) <= 0)
232                        goto end;
233                }
234            } else if (tag == V_ASN1_BOOLEAN) {
235                int ii;
236
237                opp = op;
238                ii = d2i_ASN1_BOOLEAN(NULL, &opp, len + hl);
239                if (ii < 0) {
240                    if (BIO_write(bp, "Bad boolean\n", 12) <= 0)
241                        goto end;
242                }
243                BIO_printf(bp, ":%d", ii);
244            } else if (tag == V_ASN1_BMPSTRING) {
245                /* do the BMP thang */
246            } else if (tag == V_ASN1_OCTET_STRING) {
247                int i, printable = 1;
248
249                opp = op;
250                os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl);
251                if (os != NULL && os->length > 0) {
252                    opp = os->data;
253                    /*
254                     * testing whether the octet string is printable
255                     */
256                    for (i = 0; i < os->length; i++) {
257                        if (((opp[i] < ' ') &&
258                             (opp[i] != '\n') &&
259                             (opp[i] != '\r') &&
260                             (opp[i] != '\t')) || (opp[i] > '~')) {
261                            printable = 0;
262                            break;
263                        }
264                    }
265                    if (printable)
266                        /* printable string */
267                    {
268                        if (BIO_write(bp, ":", 1) <= 0)
269                            goto end;
270                        if (BIO_write(bp, (const char *)opp, os->length) <= 0)
271                            goto end;
272                    } else if (!dump)
273                        /*
274                         * not printable => print octet string as hex dump
275                         */
276                    {
277                        if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0)
278                            goto end;
279                        for (i = 0; i < os->length; i++) {
280                            if (BIO_printf(bp, "%02X", opp[i]) <= 0)
281                                goto end;
282                        }
283                    } else
284                        /* print the normal dump */
285                    {
286                        if (!nl) {
287                            if (BIO_write(bp, "\n", 1) <= 0)
288                                goto end;
289                        }
290                        if (BIO_dump_indent(bp,
291                                            (const char *)opp,
292                                            ((dump == -1 || dump >
293                                              os->
294                                              length) ? os->length : dump),
295                                            dump_indent) <= 0)
296                            goto end;
297                        nl = 1;
298                    }
299                }
300                if (os != NULL) {
301                    M_ASN1_OCTET_STRING_free(os);
302                    os = NULL;
303                }
304            } else if (tag == V_ASN1_INTEGER) {
305                ASN1_INTEGER *bs;
306                int i;
307
308                opp = op;
309                bs = d2i_ASN1_INTEGER(NULL, &opp, len + hl);
310                if (bs != NULL) {
311                    if (BIO_write(bp, ":", 1) <= 0)
312                        goto end;
313                    if (bs->type == V_ASN1_NEG_INTEGER)
314                        if (BIO_write(bp, "-", 1) <= 0)
315                            goto end;
316                    for (i = 0; i < bs->length; i++) {
317                        if (BIO_printf(bp, "%02X", bs->data[i]) <= 0)
318                            goto end;
319                    }
320                    if (bs->length == 0) {
321                        if (BIO_write(bp, "00", 2) <= 0)
322                            goto end;
323                    }
324                } else {
325                    if (BIO_write(bp, "BAD INTEGER", 11) <= 0)
326                        goto end;
327                }
328                M_ASN1_INTEGER_free(bs);
329            } else if (tag == V_ASN1_ENUMERATED) {
330                ASN1_ENUMERATED *bs;
331                int i;
332
333                opp = op;
334                bs = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl);
335                if (bs != NULL) {
336                    if (BIO_write(bp, ":", 1) <= 0)
337                        goto end;
338                    if (bs->type == V_ASN1_NEG_ENUMERATED)
339                        if (BIO_write(bp, "-", 1) <= 0)
340                            goto end;
341                    for (i = 0; i < bs->length; i++) {
342                        if (BIO_printf(bp, "%02X", bs->data[i]) <= 0)
343                            goto end;
344                    }
345                    if (bs->length == 0) {
346                        if (BIO_write(bp, "00", 2) <= 0)
347                            goto end;
348                    }
349                } else {
350                    if (BIO_write(bp, "BAD ENUMERATED", 14) <= 0)
351                        goto end;
352                }
353                M_ASN1_ENUMERATED_free(bs);
354            } else if (len > 0 && dump) {
355                if (!nl) {
356                    if (BIO_write(bp, "\n", 1) <= 0)
357                        goto end;
358                }
359                if (BIO_dump_indent(bp, (const char *)p,
360                                    ((dump == -1 || dump > len) ? len : dump),
361                                    dump_indent) <= 0)
362                    goto end;
363                nl = 1;
364            }
365
366            if (!nl) {
367                if (BIO_write(bp, "\n", 1) <= 0)
368                    goto end;
369            }
370            p += len;
371            if ((tag == V_ASN1_EOC) && (xclass == 0)) {
372                ret = 2;        /* End of sequence */
373                goto end;
374            }
375        }
376        length -= len;
377    }
378    ret = 1;
379 end:
380    if (o != NULL)
381        ASN1_OBJECT_free(o);
382    if (os != NULL)
383        M_ASN1_OCTET_STRING_free(os);
384    *pp = p;
385    return (ret);
386}
387
388const char *ASN1_tag2str(int tag)
389{
390    static const char *const tag2str[] = {
391        /* 0-4 */
392        "EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING",
393        /* 5-9 */
394        "NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL",
395        /* 10-13 */
396        "ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>",
397        /* 15-17 */
398        "<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET",
399        /* 18-20 */
400        "NUMERICSTRING", "PRINTABLESTRING", "T61STRING",
401        /* 21-24 */
402        "VIDEOTEXSTRING", "IA5STRING", "UTCTIME", "GENERALIZEDTIME",
403        /* 25-27 */
404        "GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING",
405        /* 28-30 */
406        "UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING"
407    };
408
409    if ((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED))
410        tag &= ~0x100;
411
412    if (tag < 0 || tag > 30)
413        return "(unknown)";
414    return tag2str[tag];
415}
416