1 /* $OpenBSD: asn1_par.c,v 1.34 2022/02/12 03:07:24 jsing Exp $ */
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
61 #include <openssl/asn1.h>
62 #include <openssl/buffer.h>
63 #include <openssl/objects.h>
64
65 static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
66 int indent);
67 static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
68 int offset, int depth, int indent, int dump);
69
70 static int
asn1_print_info(BIO * bp,int tag,int xclass,int constructed,int indent)71 asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
72 int indent)
73 {
74 char str[128];
75 const char *p;
76
77 if (constructed & V_ASN1_CONSTRUCTED)
78 p="cons: ";
79 else
80 p="prim: ";
81 if (BIO_write(bp, p, 6) < 6)
82 goto err;
83 if (!BIO_indent(bp, indent, 128))
84 goto err;
85
86 p = str;
87 if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE)
88 snprintf(str, sizeof str, "priv [ %d ] ", tag);
89 else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC)
90 snprintf(str, sizeof str, "cont [ %d ]", tag);
91 else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION)
92 snprintf(str, sizeof str, "appl [ %d ]", tag);
93 else if (tag > 30)
94 snprintf(str, sizeof str, "<ASN1 %d>", tag);
95 else
96 p = ASN1_tag2str(tag);
97
98 if (BIO_printf(bp, "%-18s", p) <= 0)
99 goto err;
100 return (1);
101 err:
102 return (0);
103 }
104
105 int
ASN1_parse(BIO * bp,const unsigned char * pp,long len,int indent)106 ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent)
107 {
108 return (asn1_parse2(bp, &pp, len, 0, 0, indent, 0));
109 }
110
111 int
ASN1_parse_dump(BIO * bp,const unsigned char * pp,long len,int indent,int dump)112 ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent, int dump)
113 {
114 return (asn1_parse2(bp, &pp, len, 0, 0, indent, dump));
115 }
116
117 static int
asn1_parse2(BIO * bp,const unsigned char ** pp,long length,int offset,int depth,int indent,int dump)118 asn1_parse2(BIO *bp, const unsigned char **pp, long length, int offset,
119 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_INTEGER *ai = NULL;
128 ASN1_ENUMERATED *ae = NULL;
129 /* ASN1_BMPSTRING *bmp=NULL;*/
130 int dump_indent;
131
132 dump_indent = 6; /* Because we know BIO_dump_indent() */
133 p = *pp;
134 tot = p + length;
135 op = p - 1;
136 if (depth > 128) {
137 BIO_printf(bp, "Max depth exceeded\n");
138 goto end;
139 }
140 while ((p < tot) && (op < p)) {
141 op = p;
142 j = ASN1_get_object(&p, &len, &tag, &xclass, length);
143
144 if (j & 0x80) {
145 if (BIO_write(bp, "Error in encoding\n", 18) <= 0)
146 goto end;
147 ret = 0;
148 goto end;
149 }
150 hl = (p - op);
151 length -= hl;
152 /* if j == 0x21 it is a constructed indefinite length object */
153 if (BIO_printf(bp, "%5ld:", (long)offset +
154 (long)(op - *pp)) <= 0)
155 goto end;
156
157 if (j != (V_ASN1_CONSTRUCTED | 1)) {
158 if (BIO_printf(bp, "d=%-2d hl=%ld l=%4ld ",
159 depth, (long)hl, len) <= 0)
160 goto end;
161 } else {
162 if (BIO_printf(bp, "d=%-2d hl=%ld l=inf ",
163 depth, (long)hl) <= 0)
164 goto end;
165 }
166 if (!asn1_print_info(bp, tag, xclass, j, (indent) ? depth : 0))
167 goto end;
168 if (j & V_ASN1_CONSTRUCTED) {
169 ep = p + len;
170 if (BIO_write(bp, "\n", 1) <= 0)
171 goto end;
172 if (len > length) {
173 BIO_printf(bp, "length is greater than %ld\n",
174 length);
175 ret = 0;
176 goto end;
177 }
178 if ((j == 0x21) && (len == 0)) {
179 for (;;) {
180 r = asn1_parse2(bp, &p, (long)(tot - p),
181 offset + (p - *pp), depth + 1,
182 indent, dump);
183 if (r == 0) {
184 ret = 0;
185 goto end;
186 }
187 if ((r == 2) || (p >= tot)) {
188 len = (long)(p - ep);
189 break;
190 }
191 }
192 } else {
193 while (p < ep) {
194 r = asn1_parse2(bp, &p, (long)(ep - p),
195 offset + (p - *pp), depth + 1,
196 indent, dump);
197 if (r == 0) {
198 ret = 0;
199 goto end;
200 }
201 }
202 }
203 } else if (xclass != 0) {
204 p += len;
205 if (BIO_write(bp, "\n", 1) <= 0)
206 goto end;
207 } else {
208 nl = 0;
209 if ((tag == V_ASN1_PRINTABLESTRING) ||
210 (tag == V_ASN1_T61STRING) ||
211 (tag == V_ASN1_IA5STRING) ||
212 (tag == V_ASN1_VISIBLESTRING) ||
213 (tag == V_ASN1_NUMERICSTRING) ||
214 (tag == V_ASN1_UTF8STRING) ||
215 (tag == V_ASN1_UTCTIME) ||
216 (tag == V_ASN1_GENERALIZEDTIME)) {
217 if (BIO_write(bp, ":", 1) <= 0)
218 goto end;
219 if ((len > 0) &&
220 BIO_write(bp, (const char *)p, (int)len) !=
221 (int)len)
222 goto end;
223 } else if (tag == V_ASN1_OBJECT) {
224 opp = op;
225 if (d2i_ASN1_OBJECT(&o, &opp, len + hl) !=
226 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",
232 11) <= 0)
233 goto end;
234 }
235 } else if (tag == V_ASN1_BOOLEAN) {
236 if (len == 1 && p < tot) {
237 BIO_printf(bp, ":%u", p[0]);
238 } else {
239 if (BIO_write(bp, "Bad boolean\n",
240 12) <= 0)
241 goto end;
242 }
243 } else if (tag == V_ASN1_BMPSTRING) {
244 /* do the BMP thang */
245 } else if (tag == V_ASN1_OCTET_STRING) {
246 int i, printable = 1;
247
248 opp = op;
249 os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl);
250 if (os != NULL && os->length > 0) {
251 opp = os->data;
252 /* testing whether the octet string is
253 * printable */
254 for (i = 0; i < os->length; i++) {
255 if (((opp[i] < ' ') &&
256 (opp[i] != '\n') &&
257 (opp[i] != '\r') &&
258 (opp[i] != '\t')) ||
259 (opp[i] > '~')) {
260 printable = 0;
261 break;
262 }
263 }
264 if (printable) {
265 /* printable string */
266 if (BIO_write(bp, ":", 1) <= 0)
267 goto end;
268 if (BIO_write(bp, (const char *)opp,
269 os->length) <= 0)
270 goto end;
271 } else if (!dump) {
272 /* not printable => print octet string
273 * as hex dump */
274 if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0)
275 goto end;
276 for (i = 0; i < os->length; i++) {
277 if (BIO_printf(bp,
278 "%02X", opp[i]) <= 0)
279 goto end;
280 }
281 } else {
282 /* print the normal dump */
283 if (!nl) {
284 if (BIO_write(bp, "\n", 1) <= 0)
285 goto end;
286 }
287 if (BIO_dump_indent(bp,
288 (const char *)opp,
289 ((dump == -1 || dump >
290 os->length) ? os->length : dump),
291 dump_indent) <= 0)
292 goto end;
293 nl = 1;
294 }
295 }
296 ASN1_OCTET_STRING_free(os);
297 os = NULL;
298 } else if (tag == V_ASN1_INTEGER) {
299 int i;
300
301 opp = op;
302 ai = d2i_ASN1_INTEGER(NULL, &opp, len + hl);
303 if (ai != NULL) {
304 if (BIO_write(bp, ":", 1) <= 0)
305 goto end;
306 if (ai->type == V_ASN1_NEG_INTEGER)
307 if (BIO_write(bp, "-", 1) <= 0)
308 goto end;
309 for (i = 0; i < ai->length; i++) {
310 if (BIO_printf(bp, "%02X",
311 ai->data[i]) <= 0)
312 goto end;
313 }
314 if (ai->length == 0) {
315 if (BIO_write(bp, "00", 2) <= 0)
316 goto end;
317 }
318 } else {
319 if (BIO_write(bp, "BAD INTEGER", 11) <= 0)
320 goto end;
321 }
322 ASN1_INTEGER_free(ai);
323 ai = NULL;
324 } else if (tag == V_ASN1_ENUMERATED) {
325 int i;
326
327 opp = op;
328 ae = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl);
329 if (ae != NULL) {
330 if (BIO_write(bp, ":", 1) <= 0)
331 goto end;
332 if (ae->type == V_ASN1_NEG_ENUMERATED)
333 if (BIO_write(bp, "-", 1) <= 0)
334 goto end;
335 for (i = 0; i < ae->length; i++) {
336 if (BIO_printf(bp, "%02X",
337 ae->data[i]) <= 0)
338 goto end;
339 }
340 if (ae->length == 0) {
341 if (BIO_write(bp, "00", 2) <= 0)
342 goto end;
343 }
344 } else {
345 if (BIO_write(bp, "BAD ENUMERATED", 14) <= 0)
346 goto end;
347 }
348 ASN1_ENUMERATED_free(ae);
349 ae = NULL;
350 } else if (len > 0 && dump) {
351 if (!nl) {
352 if (BIO_write(bp, "\n", 1) <= 0)
353 goto end;
354 }
355 if (BIO_dump_indent(bp, (const char *)p,
356 ((dump == -1 || dump > len) ? len : dump),
357 dump_indent) <= 0)
358 goto end;
359 nl = 1;
360 }
361
362 if (!nl) {
363 if (BIO_write(bp, "\n", 1) <= 0)
364 goto end;
365 }
366 p += len;
367 if ((tag == V_ASN1_EOC) && (xclass == 0)) {
368 ret = 2; /* End of sequence */
369 goto end;
370 }
371 }
372 length -= len;
373 }
374 ret = 1;
375
376 end:
377 if (o != NULL)
378 ASN1_OBJECT_free(o);
379 ASN1_OCTET_STRING_free(os);
380 ASN1_INTEGER_free(ai);
381 ASN1_ENUMERATED_free(ae);
382 *pp = p;
383 return (ret);
384 }
385