1 /*
2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <stdio.h>
11 #include "internal/cryptlib.h"
12 #include <openssl/buffer.h>
13 #include <openssl/objects.h>
14 #include <openssl/asn1.h>
15
16 #ifndef ASN1_PARSE_MAXDEPTH
17 #define ASN1_PARSE_MAXDEPTH 128
18 #endif
19
20 static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
21 int indent);
22 static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
23 int offset, int depth, int indent, int dump);
asn1_print_info(BIO * bp,int tag,int xclass,int constructed,int indent)24 static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
25 int indent)
26 {
27 static const char fmt[] = "%-18s";
28 char str[128];
29 const char *p;
30
31 if (constructed & V_ASN1_CONSTRUCTED)
32 p = "cons: ";
33 else
34 p = "prim: ";
35 if (BIO_write(bp, p, 6) < 6)
36 goto err;
37 BIO_indent(bp, indent, 128);
38
39 p = str;
40 if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE)
41 BIO_snprintf(str, sizeof(str), "priv [ %d ] ", tag);
42 else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC)
43 BIO_snprintf(str, sizeof(str), "cont [ %d ]", tag);
44 else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION)
45 BIO_snprintf(str, sizeof(str), "appl [ %d ]", tag);
46 else if (tag > 30)
47 BIO_snprintf(str, sizeof(str), "<ASN1 %d>", tag);
48 else
49 p = ASN1_tag2str(tag);
50
51 if (BIO_printf(bp, fmt, p) <= 0)
52 goto err;
53 return 1;
54 err:
55 return 0;
56 }
57
ASN1_parse(BIO * bp,const unsigned char * pp,long len,int indent)58 int ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent)
59 {
60 return asn1_parse2(bp, &pp, len, 0, 0, indent, 0);
61 }
62
ASN1_parse_dump(BIO * bp,const unsigned char * pp,long len,int indent,int dump)63 int ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent,
64 int dump)
65 {
66 return asn1_parse2(bp, &pp, len, 0, 0, indent, dump);
67 }
68
asn1_parse2(BIO * bp,const unsigned char ** pp,long length,int offset,int depth,int indent,int dump)69 static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
70 int offset, int depth, int indent, int dump)
71 {
72 const unsigned char *p, *ep, *tot, *op, *opp;
73 long len;
74 int tag, xclass, ret = 0;
75 int nl, hl, j, r;
76 ASN1_OBJECT *o = NULL;
77 ASN1_OCTET_STRING *os = NULL;
78 ASN1_INTEGER *ai = NULL;
79 ASN1_ENUMERATED *ae = NULL;
80 /* ASN1_BMPSTRING *bmp=NULL; */
81 int dump_indent, dump_cont = 0;
82
83 if (depth > ASN1_PARSE_MAXDEPTH) {
84 BIO_puts(bp, "BAD RECURSION DEPTH\n");
85 return 0;
86 }
87
88 dump_indent = 6; /* Because we know BIO_dump_indent() */
89 p = *pp;
90 tot = p + length;
91 while (length > 0) {
92 op = p;
93 j = ASN1_get_object(&p, &len, &tag, &xclass, length);
94 if (j & 0x80) {
95 if (BIO_write(bp, "Error in encoding\n", 18) <= 0)
96 goto end;
97 ret = 0;
98 goto end;
99 }
100 hl = (p - op);
101 length -= hl;
102 /*
103 * if j == 0x21 it is a constructed indefinite length object
104 */
105 if (BIO_printf(bp, "%5ld:", (long)offset + (long)(op - *pp))
106 <= 0)
107 goto end;
108
109 if (j != (V_ASN1_CONSTRUCTED | 1)) {
110 if (BIO_printf(bp, "d=%-2d hl=%ld l=%4ld ",
111 depth, (long)hl, len) <= 0)
112 goto end;
113 } else {
114 if (BIO_printf(bp, "d=%-2d hl=%ld l=inf ", depth, (long)hl) <= 0)
115 goto end;
116 }
117 if (!asn1_print_info(bp, tag, xclass, j, (indent) ? depth : 0))
118 goto end;
119 if (j & V_ASN1_CONSTRUCTED) {
120 const unsigned char *sp = p;
121
122 ep = p + len;
123 if (BIO_write(bp, "\n", 1) <= 0)
124 goto end;
125 if (len > length) {
126 BIO_printf(bp, "length is greater than %ld\n", length);
127 ret = 0;
128 goto end;
129 }
130 if ((j == 0x21) && (len == 0)) {
131 for (;;) {
132 r = asn1_parse2(bp, &p, (long)(tot - p),
133 offset + (p - *pp), depth + 1,
134 indent, dump);
135 if (r == 0) {
136 ret = 0;
137 goto end;
138 }
139 if ((r == 2) || (p >= tot)) {
140 len = p - sp;
141 break;
142 }
143 }
144 } else {
145 long tmp = len;
146
147 while (p < ep) {
148 sp = p;
149 r = asn1_parse2(bp, &p, tmp,
150 offset + (p - *pp), depth + 1,
151 indent, dump);
152 if (r == 0) {
153 ret = 0;
154 goto end;
155 }
156 tmp -= p - sp;
157 }
158 }
159 } else if (xclass != 0) {
160 p += len;
161 if (BIO_write(bp, "\n", 1) <= 0)
162 goto end;
163 } else {
164 nl = 0;
165 if ((tag == V_ASN1_PRINTABLESTRING) ||
166 (tag == V_ASN1_T61STRING) ||
167 (tag == V_ASN1_IA5STRING) ||
168 (tag == V_ASN1_VISIBLESTRING) ||
169 (tag == V_ASN1_NUMERICSTRING) ||
170 (tag == V_ASN1_UTF8STRING) ||
171 (tag == V_ASN1_UTCTIME) || (tag == V_ASN1_GENERALIZEDTIME)) {
172 if (BIO_write(bp, ":", 1) <= 0)
173 goto end;
174 if ((len > 0) && BIO_write(bp, (const char *)p, (int)len)
175 != (int)len)
176 goto end;
177 } else if (tag == V_ASN1_OBJECT) {
178 opp = op;
179 if (d2i_ASN1_OBJECT(&o, &opp, len + hl) != NULL) {
180 if (BIO_write(bp, ":", 1) <= 0)
181 goto end;
182 i2a_ASN1_OBJECT(bp, o);
183 } else {
184 if (BIO_puts(bp, ":BAD OBJECT") <= 0)
185 goto end;
186 dump_cont = 1;
187 }
188 } else if (tag == V_ASN1_BOOLEAN) {
189 if (len != 1) {
190 if (BIO_puts(bp, ":BAD BOOLEAN") <= 0)
191 goto end;
192 dump_cont = 1;
193 }
194 if (len > 0)
195 BIO_printf(bp, ":%u", p[0]);
196 } else if (tag == V_ASN1_BMPSTRING) {
197 /* do the BMP thang */
198 } else if (tag == V_ASN1_OCTET_STRING) {
199 int i, printable = 1;
200
201 opp = op;
202 os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl);
203 if (os != NULL && os->length > 0) {
204 opp = os->data;
205 /*
206 * testing whether the octet string is printable
207 */
208 for (i = 0; i < os->length; i++) {
209 if (((opp[i] < ' ') &&
210 (opp[i] != '\n') &&
211 (opp[i] != '\r') &&
212 (opp[i] != '\t')) || (opp[i] > '~')) {
213 printable = 0;
214 break;
215 }
216 }
217 if (printable)
218 /* printable string */
219 {
220 if (BIO_write(bp, ":", 1) <= 0)
221 goto end;
222 if (BIO_write(bp, (const char *)opp, os->length) <= 0)
223 goto end;
224 } else if (!dump)
225 /*
226 * not printable => print octet string as hex dump
227 */
228 {
229 if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0)
230 goto end;
231 for (i = 0; i < os->length; i++) {
232 if (BIO_printf(bp, "%02X", opp[i]) <= 0)
233 goto end;
234 }
235 } else
236 /* print the normal dump */
237 {
238 if (!nl) {
239 if (BIO_write(bp, "\n", 1) <= 0)
240 goto end;
241 }
242 if (BIO_dump_indent(bp,
243 (const char *)opp,
244 ((dump == -1 || dump >
245 os->
246 length) ? os->length : dump),
247 dump_indent) <= 0)
248 goto end;
249 nl = 1;
250 }
251 }
252 ASN1_OCTET_STRING_free(os);
253 os = NULL;
254 } else if (tag == V_ASN1_INTEGER) {
255 int i;
256
257 opp = op;
258 ai = d2i_ASN1_INTEGER(NULL, &opp, len + hl);
259 if (ai != NULL) {
260 if (BIO_write(bp, ":", 1) <= 0)
261 goto end;
262 if (ai->type == V_ASN1_NEG_INTEGER)
263 if (BIO_write(bp, "-", 1) <= 0)
264 goto end;
265 for (i = 0; i < ai->length; i++) {
266 if (BIO_printf(bp, "%02X", ai->data[i]) <= 0)
267 goto end;
268 }
269 if (ai->length == 0) {
270 if (BIO_write(bp, "00", 2) <= 0)
271 goto end;
272 }
273 } else {
274 if (BIO_puts(bp, ":BAD INTEGER") <= 0)
275 goto end;
276 dump_cont = 1;
277 }
278 ASN1_INTEGER_free(ai);
279 ai = NULL;
280 } else if (tag == V_ASN1_ENUMERATED) {
281 int i;
282
283 opp = op;
284 ae = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl);
285 if (ae != NULL) {
286 if (BIO_write(bp, ":", 1) <= 0)
287 goto end;
288 if (ae->type == V_ASN1_NEG_ENUMERATED)
289 if (BIO_write(bp, "-", 1) <= 0)
290 goto end;
291 for (i = 0; i < ae->length; i++) {
292 if (BIO_printf(bp, "%02X", ae->data[i]) <= 0)
293 goto end;
294 }
295 if (ae->length == 0) {
296 if (BIO_write(bp, "00", 2) <= 0)
297 goto end;
298 }
299 } else {
300 if (BIO_puts(bp, ":BAD ENUMERATED") <= 0)
301 goto end;
302 dump_cont = 1;
303 }
304 ASN1_ENUMERATED_free(ae);
305 ae = NULL;
306 } else if (len > 0 && dump) {
307 if (!nl) {
308 if (BIO_write(bp, "\n", 1) <= 0)
309 goto end;
310 }
311 if (BIO_dump_indent(bp, (const char *)p,
312 ((dump == -1 || dump > len) ? len : dump),
313 dump_indent) <= 0)
314 goto end;
315 nl = 1;
316 }
317 if (dump_cont) {
318 int i;
319 const unsigned char *tmp = op + hl;
320 if (BIO_puts(bp, ":[") <= 0)
321 goto end;
322 for (i = 0; i < len; i++) {
323 if (BIO_printf(bp, "%02X", tmp[i]) <= 0)
324 goto end;
325 }
326 if (BIO_puts(bp, "]") <= 0)
327 goto end;
328 }
329
330 if (!nl) {
331 if (BIO_write(bp, "\n", 1) <= 0)
332 goto end;
333 }
334 p += len;
335 if ((tag == V_ASN1_EOC) && (xclass == 0)) {
336 ret = 2; /* End of sequence */
337 goto end;
338 }
339 }
340 length -= len;
341 }
342 ret = 1;
343 end:
344 ASN1_OBJECT_free(o);
345 ASN1_OCTET_STRING_free(os);
346 ASN1_INTEGER_free(ai);
347 ASN1_ENUMERATED_free(ae);
348 *pp = p;
349 return ret;
350 }
351
ASN1_tag2str(int tag)352 const char *ASN1_tag2str(int tag)
353 {
354 static const char *const tag2str[] = {
355 /* 0-4 */
356 "EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING",
357 /* 5-9 */
358 "NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL",
359 /* 10-13 */
360 "ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>",
361 /* 15-17 */
362 "<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET",
363 /* 18-20 */
364 "NUMERICSTRING", "PRINTABLESTRING", "T61STRING",
365 /* 21-24 */
366 "VIDEOTEXSTRING", "IA5STRING", "UTCTIME", "GENERALIZEDTIME",
367 /* 25-27 */
368 "GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING",
369 /* 28-30 */
370 "UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING"
371 };
372
373 if ((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED))
374 tag &= ~0x100;
375
376 if (tag < 0 || tag > 30)
377 return "(unknown)";
378 return tag2str[tag];
379 }
380