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1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2  * All rights reserved.
3  *
4  * This package is an SSL implementation written
5  * by Eric Young (eay@cryptsoft.com).
6  * The implementation was written so as to conform with Netscapes SSL.
7  *
8  * This library is free for commercial and non-commercial use as long as
9  * the following conditions are aheared to.  The following conditions
10  * apply to all code found in this distribution, be it the RC4, RSA,
11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
12  * included with this distribution is covered by the same copyright terms
13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14  *
15  * Copyright remains Eric Young's, and as such any Copyright notices in
16  * the code are not to be removed.
17  * If this package is used in a product, Eric Young should be given attribution
18  * as the author of the parts of the library used.
19  * This can be in the form of a textual message at program startup or
20  * in documentation (online or textual) provided with the package.
21  *
22  * Redistribution and use in source and binary forms, with or without
23  * modification, are permitted provided that the following conditions
24  * are met:
25  * 1. Redistributions of source code must retain the copyright
26  *    notice, this list of conditions and the following disclaimer.
27  * 2. Redistributions in binary form must reproduce the above copyright
28  *    notice, this list of conditions and the following disclaimer in the
29  *    documentation and/or other materials provided with the distribution.
30  * 3. All advertising materials mentioning features or use of this software
31  *    must display the following acknowledgement:
32  *    "This product includes cryptographic software written by
33  *     Eric Young (eay@cryptsoft.com)"
34  *    The word 'cryptographic' can be left out if the rouines from the library
35  *    being used are not cryptographic related :-).
36  * 4. If you include any Windows specific code (or a derivative thereof) from
37  *    the apps directory (application code) you must include an acknowledgement:
38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39  *
40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50  * SUCH DAMAGE.
51  *
52  * The licence and distribution terms for any publically available version or
53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
54  * copied and put under another distribution licence
55  * [including the GNU Public Licence.] */
56 
57 #include <openssl/asn1.h>
58 
59 #include <openssl/bio.h>
60 #include <openssl/err.h>
61 #include <openssl/mem.h>
62 
63 
64 #define ASN1_PARSE_MAXDEPTH 128
65 
66 static int asn1_print_info(BIO *bp, int tag, int xclass,int constructed,
67 	int indent);
68 static int asn1_parse2(BIO *bp, const unsigned char **pp, long length,
69 	int offset, int depth, int indent, int dump);
asn1_print_info(BIO * bp,int tag,int xclass,int constructed,int indent)70 static int asn1_print_info(BIO *bp, int tag, int xclass, int constructed,
71 	     int indent)
72 	{
73 	static const char fmt[]="%-18s";
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) 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 
ASN1_parse(BIO * bp,const unsigned char * pp,long len,int indent)103 int 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 
ASN1_parse_dump(BIO * bp,const unsigned char * pp,long len,int indent,int dump)108 int ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent, int dump)
109 	{
110 	return(asn1_parse2(bp,&pp,len,0,0,indent,dump));
111 	}
112 
asn1_parse2(BIO * bp,const unsigned char ** pp,long length,int offset,int depth,int indent,int dump)113 static int asn1_parse2(BIO *bp, const unsigned char **pp, long length, int offset,
114 	     int depth, int indent, int dump)
115 	{
116 	const unsigned char *p,*ep,*tot,*op,*opp;
117 	long len;
118 	int tag,xclass,ret=0;
119 	int nl,hl,j,r;
120 	ASN1_OBJECT *o=NULL;
121 	ASN1_OCTET_STRING *os=NULL;
122 	/* ASN1_BMPSTRING *bmp=NULL;*/
123 	int dump_indent;
124 
125 #if 0
126 	dump_indent = indent;
127 #else
128 	dump_indent = 6;	/* Because we know BIO_dump_indent() */
129 #endif
130 
131 	if (depth > ASN1_PARSE_MAXDEPTH)
132 		{
133 		BIO_puts(bp, "BAD RECURSION DEPTH\n");
134 		return 0;
135 		}
136 
137 	p= *pp;
138 	tot=p+length;
139 	op=p-1;
140 	while ((p < tot) && (op < p))
141 		{
142 		op=p;
143 		j=ASN1_get_object(&p,&len,&tag,&xclass,length);
144 #ifdef LINT
145 		j=j;
146 #endif
147 		if (j & 0x80)
148 			{
149 			if (BIO_puts(bp, "Error in encoding\n") <= 0)
150 				goto end;
151 			ret=0;
152 			goto end;
153 			}
154 		hl=(p-op);
155 		length-=hl;
156 		/* if j == 0x21 it is a constructed indefinite length object */
157 		if (BIO_printf(bp,"%5ld:",(long)offset+(long)(op- *pp))
158 			<= 0) goto end;
159 
160 		if (j != (V_ASN1_CONSTRUCTED | 1))
161 			{
162 			if (BIO_printf(bp,"d=%-2d hl=%ld l=%4ld ",
163 				depth,(long)hl,len) <= 0)
164 				goto end;
165 			}
166 		else
167 			{
168 			if (BIO_printf(bp,"d=%-2d hl=%ld l=inf  ",
169 				depth,(long)hl) <= 0)
170 				goto end;
171 			}
172 		if (!asn1_print_info(bp,tag,xclass,j,(indent)?depth:0))
173 			goto end;
174 		if (j & V_ASN1_CONSTRUCTED)
175 			{
176 			ep=p+len;
177 			if (BIO_puts(bp, "\n") <= 0) goto end;
178 			if (len > length)
179 				{
180 				BIO_printf(bp,
181 					"length is greater than %ld\n",length);
182 				ret=0;
183 				goto end;
184 				}
185 			if ((j == 0x21) && (len == 0))
186 				{
187 				for (;;)
188 					{
189 					r=asn1_parse2(bp,&p,(long)(tot-p),
190 						offset+(p - *pp),depth+1,
191 						indent,dump);
192 					if (r == 0) { ret=0; goto end; }
193 					if ((r == 2) || (p >= tot)) break;
194 					}
195 				}
196 			else
197 				while (p < ep)
198 					{
199 					r=asn1_parse2(bp,&p,(long)len,
200 						offset+(p - *pp),depth+1,
201 						indent,dump);
202 					if (r == 0) { ret=0; goto end; }
203 					}
204 			}
205 		else if (xclass != 0)
206 			{
207 			p+=len;
208 			if (BIO_puts(bp, "\n") <= 0) goto end;
209 			}
210 		else
211 			{
212 			nl=0;
213 			if (	(tag == V_ASN1_PRINTABLESTRING) ||
214 				(tag == V_ASN1_T61STRING) ||
215 				(tag == V_ASN1_IA5STRING) ||
216 				(tag == V_ASN1_VISIBLESTRING) ||
217 				(tag == V_ASN1_NUMERICSTRING) ||
218 				(tag == V_ASN1_UTF8STRING) ||
219 				(tag == V_ASN1_UTCTIME) ||
220 				(tag == V_ASN1_GENERALIZEDTIME))
221 				{
222 				if (BIO_puts(bp, ":") <= 0) goto end;
223 				if ((len > 0) &&
224 					BIO_write(bp,(const char *)p,(int)len)
225 					!= (int)len)
226 					goto end;
227 				}
228 			else if (tag == V_ASN1_OBJECT)
229 				{
230 				opp=op;
231 				if (d2i_ASN1_OBJECT(&o,&opp,len+hl) != NULL)
232 					{
233 					if (BIO_puts(bp, ":") <= 0) goto end;
234 					i2a_ASN1_OBJECT(bp,o);
235 					}
236 				else
237 					{
238 					if (BIO_puts(bp, ":BAD OBJECT") <= 0)
239 						goto end;
240 					}
241 				}
242 			else if (tag == V_ASN1_BOOLEAN)
243 				{
244 				int ii;
245 
246 				opp=op;
247 				ii=d2i_ASN1_BOOLEAN(NULL,&opp,len+hl);
248 				if (ii < 0)
249 					{
250 					if (BIO_puts(bp, "Bad boolean\n") <= 0)
251 						goto end;
252 					}
253 				BIO_printf(bp,":%d",ii);
254 				}
255 			else if (tag == V_ASN1_BMPSTRING)
256 				{
257 				/* do the BMP thang */
258 				}
259 			else if (tag == V_ASN1_OCTET_STRING)
260 				{
261 				int i,printable=1;
262 
263 				opp=op;
264 				os=d2i_ASN1_OCTET_STRING(NULL,&opp,len+hl);
265 				if (os != NULL && os->length > 0)
266 					{
267 					opp = os->data;
268 					/* testing whether the octet string is
269 					 * printable */
270 					for (i=0; i<os->length; i++)
271 						{
272 						if ((	(opp[i] < ' ') &&
273 							(opp[i] != '\n') &&
274 							(opp[i] != '\r') &&
275 							(opp[i] != '\t')) ||
276 							(opp[i] > '~'))
277 							{
278 							printable=0;
279 							break;
280 							}
281 						}
282 					if (printable)
283 					/* printable string */
284 						{
285 						if (BIO_puts(bp, ":") <= 0)
286 							goto end;
287 						if (BIO_write(bp,(const char *)opp,
288 							os->length) <= 0)
289 							goto end;
290 						}
291 					else if (!dump)
292 					/* not printable => print octet string
293 					 * as hex dump */
294 						{
295 						if (BIO_puts(bp, "[HEX DUMP]:") <= 0)
296 							goto end;
297 						for (i=0; i<os->length; i++)
298 							{
299 							if (BIO_printf(bp,"%02X"
300 								, opp[i]) <= 0)
301 								goto end;
302 							}
303 						}
304 					else
305 					/* print the normal dump */
306 						{
307 						if (!nl)
308 							{
309 							if (BIO_puts(bp, "\n") <= 0)
310 								goto end;
311 							}
312 						if (!BIO_hexdump(bp, opp,
313 							((dump == -1 || dump >
314 							os->length)?os->length:dump),
315 							dump_indent))
316 							goto end;
317 						nl=1;
318 						}
319 					}
320 				if (os != NULL)
321 					{
322 					M_ASN1_OCTET_STRING_free(os);
323 					os=NULL;
324 					}
325 				}
326 			else if (tag == V_ASN1_INTEGER)
327 				{
328 				ASN1_INTEGER *bs;
329 				int i;
330 
331 				opp=op;
332 				bs=d2i_ASN1_INTEGER(NULL,&opp,len+hl);
333 				if (bs != NULL)
334 					{
335 					if (BIO_puts(bp, ":") <= 0) goto end;
336 					if (bs->type == V_ASN1_NEG_INTEGER)
337 						if (BIO_puts(bp, "-") <= 0)
338 							goto end;
339 					for (i=0; i<bs->length; i++)
340 						{
341 						if (BIO_printf(bp,"%02X",
342 							bs->data[i]) <= 0)
343 							goto end;
344 						}
345 					if (bs->length == 0)
346 						{
347 						if (BIO_puts(bp, "00") <= 0)
348 							goto end;
349 						}
350 					}
351 				else
352 					{
353 					if (BIO_puts(bp, "BAD INTEGER") <= 0)
354 						goto end;
355 					}
356 				M_ASN1_INTEGER_free(bs);
357 				}
358 			else if (tag == V_ASN1_ENUMERATED)
359 				{
360 				ASN1_ENUMERATED *bs;
361 				int i;
362 
363 				opp=op;
364 				bs=d2i_ASN1_ENUMERATED(NULL,&opp,len+hl);
365 				if (bs != NULL)
366 					{
367 					if (BIO_puts(bp, ":") <= 0) goto end;
368 					if (bs->type == V_ASN1_NEG_ENUMERATED)
369 						if (BIO_puts(bp, "-") <= 0)
370 							goto end;
371 					for (i=0; i<bs->length; i++)
372 						{
373 						if (BIO_printf(bp,"%02X",
374 							bs->data[i]) <= 0)
375 							goto end;
376 						}
377 					if (bs->length == 0)
378 						{
379 						if (BIO_puts(bp, "00") <= 0)
380 							goto end;
381 						}
382 					}
383 				else
384 					{
385 					if (BIO_puts(bp, "BAD ENUMERATED") <= 0)
386 						goto end;
387 					}
388 				M_ASN1_ENUMERATED_free(bs);
389 				}
390 			else if (len > 0 && dump)
391 				{
392 				if (!nl)
393 					{
394 					if (BIO_puts(bp, "\n") <= 0)
395 						goto end;
396 					}
397 				if (!BIO_hexdump(bp,p,
398 					((dump == -1 || dump > len)?len:dump),
399 					dump_indent))
400 					goto end;
401 				nl=1;
402 				}
403 
404 			if (!nl)
405 				{
406 				if (BIO_puts(bp, "\n") <= 0) goto end;
407 				}
408 			p+=len;
409 			if ((tag == V_ASN1_EOC) && (xclass == 0))
410 				{
411 				ret=2; /* End of sequence */
412 				goto end;
413 				}
414 			}
415 		length-=len;
416 		}
417 	ret=1;
418 end:
419 	if (o != NULL) ASN1_OBJECT_free(o);
420 	if (os != NULL) M_ASN1_OCTET_STRING_free(os);
421 	*pp=p;
422 	return(ret);
423 	}
424 
ASN1_tag2str(int tag)425 const char *ASN1_tag2str(int tag)
426 {
427 	static const char * const tag2str[] = {
428 	 "EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING", /* 0-4 */
429 	 "NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL", /* 5-9 */
430 	 "ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>", 	    /* 10-13 */
431 	"<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET", 		    /* 15-17 */
432 	"NUMERICSTRING", "PRINTABLESTRING", "T61STRING",	    /* 18-20 */
433 	"VIDEOTEXSTRING", "IA5STRING", "UTCTIME","GENERALIZEDTIME", /* 21-24 */
434 	"GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING",	    /* 25-27 */
435 	"UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING"		    /* 28-30 */
436 	};
437 
438 	if((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED))
439 							tag &= ~0x100;
440 
441 	if(tag < 0 || tag > 30) return "(unknown)";
442 	return tag2str[tag];
443 }
444 
445