asn1_par.c revision 296341 
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
65static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
66                           int indent);
67static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
68                       int offset, int depth, int indent, int dump);
69static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
70                           int indent)
71{
72    static const char fmt[] = "%-18s";
73    char str[128];
74    const char *p;
75
76    if (constructed & V_ASN1_CONSTRUCTED)
77        p = "cons: ";
78    else
79        p = "prim: ";
80    if (BIO_write(bp, p, 6) < 6)
81        goto err;
82    BIO_indent(bp, indent, 128);
83
84    p = str;
85    if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE)
86        BIO_snprintf(str, sizeof str, "priv [ %d ] ", tag);
87    else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC)
88        BIO_snprintf(str, sizeof str, "cont [ %d ]", tag);
89    else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION)
90        BIO_snprintf(str, sizeof str, "appl [ %d ]", tag);
91    else if (tag > 30)
92        BIO_snprintf(str, sizeof str, "<ASN1 %d>", tag);
93    else
94        p = ASN1_tag2str(tag);
95
96    if (BIO_printf(bp, fmt, p) <= 0)
97        goto err;
98    return (1);
99 err:
100    return (0);
101}
102
103int ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent)
104{
105    return (asn1_parse2(bp, &pp, len, 0, 0, indent, 0));
106}
107
108int ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent,
109                    int dump)
110{
111    return (asn1_parse2(bp, &pp, len, 0, 0, indent, dump));
112}
113
114static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
115                       int offset, int depth, int indent, int dump)
116{
117    const unsigned char *p, *ep, *tot, *op, *opp;
118    long len;
119    int tag, xclass, ret = 0;
120    int nl, hl, j, r;
121    ASN1_OBJECT *o = NULL;
122    ASN1_OCTET_STRING *os = NULL;
123    /* ASN1_BMPSTRING *bmp=NULL; */
124    int dump_indent;
125
126#if 0
127    dump_indent = indent;
128#else
129    dump_indent = 6;            /* Because we know BIO_dump_indent() */
130#endif
131    p = *pp;
132    tot = p + length;
133    op = p - 1;
134    while ((p < tot) && (op < p)) {
135        op = p;
136        j = ASN1_get_object(&p, &len, &tag, &xclass, length);
137#ifdef LINT
138        j = j;
139#endif
140        if (j & 0x80) {
141            if (BIO_write(bp, "Error in encoding\n", 18) <= 0)
142                goto end;
143            ret = 0;
144            goto end;
145        }
146        hl = (p - op);
147        length -= hl;
148        /*
149         * if j == 0x21 it is a constructed indefinite length object
150         */
151        if (BIO_printf(bp, "%5ld:", (long)offset + (long)(op - *pp))
152            <= 0)
153            goto end;
154
155        if (j != (V_ASN1_CONSTRUCTED | 1)) {
156            if (BIO_printf(bp, "d=%-2d hl=%ld l=%4ld ",
157                           depth, (long)hl, len) <= 0)
158                goto end;
159        } else {
160            if (BIO_printf(bp, "d=%-2d hl=%ld l=inf  ", depth, (long)hl) <= 0)
161                goto end;
162        }
163        if (!asn1_print_info(bp, tag, xclass, j, (indent) ? depth : 0))
164            goto end;
165        if (j & V_ASN1_CONSTRUCTED) {
166            ep = p + len;
167            if (BIO_write(bp, "\n", 1) <= 0)
168                goto end;
169            if (len > length) {
170                BIO_printf(bp, "length is greater than %ld\n", length);
171                ret = 0;
172                goto end;
173            }
174            if ((j == 0x21) && (len == 0)) {
175                for (;;) {
176                    r = asn1_parse2(bp, &p, (long)(tot - p),
177                                    offset + (p - *pp), depth + 1,
178                                    indent, dump);
179                    if (r == 0) {
180                        ret = 0;
181                        goto end;
182                    }
183                    if ((r == 2) || (p >= tot))
184                        break;
185                }
186            } else
187                while (p < ep) {
188                    r = asn1_parse2(bp, &p, (long)len,
189                                    offset + (p - *pp), depth + 1,
190                                    indent, dump);
191                    if (r == 0) {
192                        ret = 0;
193                        goto end;
194                    }
195                }
196        } else if (xclass != 0) {
197            p += len;
198            if (BIO_write(bp, "\n", 1) <= 0)
199                goto end;
200        } else {
201            nl = 0;
202            if ((tag == V_ASN1_PRINTABLESTRING) ||
203                (tag == V_ASN1_T61STRING) ||
204                (tag == V_ASN1_IA5STRING) ||
205                (tag == V_ASN1_VISIBLESTRING) ||
206                (tag == V_ASN1_NUMERICSTRING) ||
207                (tag == V_ASN1_UTF8STRING) ||
208                (tag == V_ASN1_UTCTIME) || (tag == V_ASN1_GENERALIZEDTIME)) {
209                if (BIO_write(bp, ":", 1) <= 0)
210                    goto end;
211                if ((len > 0) && BIO_write(bp, (const char *)p, (int)len)
212                    != (int)len)
213                    goto end;
214            } else if (tag == V_ASN1_OBJECT) {
215                opp = op;
216                if (d2i_ASN1_OBJECT(&o, &opp, len + hl) != NULL) {
217                    if (BIO_write(bp, ":", 1) <= 0)
218                        goto end;
219                    i2a_ASN1_OBJECT(bp, o);
220                } else {
221                    if (BIO_write(bp, ":BAD OBJECT", 11) <= 0)
222                        goto end;
223                }
224            } else if (tag == V_ASN1_BOOLEAN) {
225                int ii;
226
227                opp = op;
228                ii = d2i_ASN1_BOOLEAN(NULL, &opp, len + hl);
229                if (ii < 0) {
230                    if (BIO_write(bp, "Bad boolean\n", 12) <= 0)
231                        goto end;
232                }
233                BIO_printf(bp, ":%d", ii);
234            } else if (tag == V_ASN1_BMPSTRING) {
235                /* do the BMP thang */
236            } else if (tag == V_ASN1_OCTET_STRING) {
237                int i, printable = 1;
238
239                opp = op;
240                os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl);
241                if (os != NULL && os->length > 0) {
242                    opp = os->data;
243                    /*
244                     * testing whether the octet string is printable
245                     */
246                    for (i = 0; i < os->length; i++) {
247                        if (((opp[i] < ' ') &&
248                             (opp[i] != '\n') &&
249                             (opp[i] != '\r') &&
250                             (opp[i] != '\t')) || (opp[i] > '~')) {
251                            printable = 0;
252                            break;
253                        }
254                    }
255                    if (printable)
256                        /* printable string */
257                    {
258                        if (BIO_write(bp, ":", 1) <= 0)
259                            goto end;
260                        if (BIO_write(bp, (const char *)opp, os->length) <= 0)
261                            goto end;
262                    } else if (!dump)
263                        /*
264                         * not printable => print octet string as hex dump
265                         */
266                    {
267                        if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0)
268                            goto end;
269                        for (i = 0; i < os->length; i++) {
270                            if (BIO_printf(bp, "%02X", opp[i]) <= 0)
271                                goto end;
272                        }
273                    } else
274                        /* print the normal dump */
275                    {
276                        if (!nl) {
277                            if (BIO_write(bp, "\n", 1) <= 0)
278                                goto end;
279                        }
280                        if (BIO_dump_indent(bp,
281                                            (const char *)opp,
282                                            ((dump == -1 || dump >
283                                              os->
284                                              length) ? os->length : dump),
285                                            dump_indent) <= 0)
286                            goto end;
287                        nl = 1;
288                    }
289                }
290                if (os != NULL) {
291                    M_ASN1_OCTET_STRING_free(os);
292                    os = NULL;
293                }
294            } else if (tag == V_ASN1_INTEGER) {
295                ASN1_INTEGER *bs;
296                int i;
297
298                opp = op;
299                bs = d2i_ASN1_INTEGER(NULL, &opp, len + hl);
300                if (bs != NULL) {
301                    if (BIO_write(bp, ":", 1) <= 0)
302                        goto end;
303                    if (bs->type == V_ASN1_NEG_INTEGER)
304                        if (BIO_write(bp, "-", 1) <= 0)
305                            goto end;
306                    for (i = 0; i < bs->length; i++) {
307                        if (BIO_printf(bp, "%02X", bs->data[i]) <= 0)
308                            goto end;
309                    }
310                    if (bs->length == 0) {
311                        if (BIO_write(bp, "00", 2) <= 0)
312                            goto end;
313                    }
314                } else {
315                    if (BIO_write(bp, "BAD INTEGER", 11) <= 0)
316                        goto end;
317                }
318                M_ASN1_INTEGER_free(bs);
319            } else if (tag == V_ASN1_ENUMERATED) {
320                ASN1_ENUMERATED *bs;
321                int i;
322
323                opp = op;
324                bs = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl);
325                if (bs != NULL) {
326                    if (BIO_write(bp, ":", 1) <= 0)
327                        goto end;
328                    if (bs->type == V_ASN1_NEG_ENUMERATED)
329                        if (BIO_write(bp, "-", 1) <= 0)
330                            goto end;
331                    for (i = 0; i < bs->length; i++) {
332                        if (BIO_printf(bp, "%02X", bs->data[i]) <= 0)
333                            goto end;
334                    }
335                    if (bs->length == 0) {
336                        if (BIO_write(bp, "00", 2) <= 0)
337                            goto end;
338                    }
339                } else {
340                    if (BIO_write(bp, "BAD ENUMERATED", 14) <= 0)
341                        goto end;
342                }
343                M_ASN1_ENUMERATED_free(bs);
344            } else if (len > 0 && dump) {
345                if (!nl) {
346                    if (BIO_write(bp, "\n", 1) <= 0)
347                        goto end;
348                }
349                if (BIO_dump_indent(bp, (const char *)p,
350                                    ((dump == -1 || dump > len) ? len : dump),
351                                    dump_indent) <= 0)
352                    goto end;
353                nl = 1;
354            }
355
356            if (!nl) {
357                if (BIO_write(bp, "\n", 1) <= 0)
358                    goto end;
359            }
360            p += len;
361            if ((tag == V_ASN1_EOC) && (xclass == 0)) {
362                ret = 2;        /* End of sequence */
363                goto end;
364            }
365        }
366        length -= len;
367    }
368    ret = 1;
369 end:
370    if (o != NULL)
371        ASN1_OBJECT_free(o);
372    if (os != NULL)
373        M_ASN1_OCTET_STRING_free(os);
374    *pp = p;
375    return (ret);
376}
377
378const char *ASN1_tag2str(int tag)
379{
380    static const char *const tag2str[] = {
381        /* 0-4 */
382        "EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING",
383        /* 5-9 */
384        "NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL",
385        /* 10-13 */
386        "ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>",
387        /* 15-17 */
388        "<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET",
389        /* 18-20 */
390        "NUMERICSTRING", "PRINTABLESTRING", "T61STRING",
391        /* 21-24 */
392        "VIDEOTEXSTRING", "IA5STRING", "UTCTIME", "GENERALIZEDTIME",
393        /* 25-27 */
394        "GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING",
395        /* 28-30 */
396        "UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING"
397    };
398
399    if ((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED))
400        tag &= ~0x100;
401
402    if (tag < 0 || tag > 30)
403        return "(unknown)";
404    return tag2str[tag];
405}
406