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asn1_par.c
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1 /* crypto/asn1/asn1_par.c */
2 /* Copyright (C) 1995-1998 Eric Young ([email protected])
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young ([email protected]).
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 ([email protected]).
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 ([email protected])"
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 ([email protected])"
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 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 static 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) goto err;
81  BIO_indent(bp,indent,128);
82 
83  p=str;
84  if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE)
85  BIO_snprintf(str,sizeof str,"priv [ %d ] ",tag);
86  else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC)
87  BIO_snprintf(str,sizeof str,"cont [ %d ]",tag);
88  else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION)
89  BIO_snprintf(str,sizeof str,"appl [ %d ]",tag);
90  else if (tag > 30)
91  BIO_snprintf(str,sizeof str,"<ASN1 %d>",tag);
92  else
93  p = ASN1_tag2str(tag);
94 
95  if (BIO_printf(bp,fmt,p) <= 0)
96  goto err;
97  return(1);
98 err:
99  return(0);
100  }
101 
102 int ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent)
103  {
104  return(asn1_parse2(bp,&pp,len,0,0,indent,0));
105  }
106 
107 int ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent, int dump)
108  {
109  return(asn1_parse2(bp,&pp,len,0,0,indent,dump));
110  }
111 
112 static int asn1_parse2(BIO *bp, const unsigned char **pp, long length, int offset,
113  int depth, int indent, int dump)
114  {
115  const unsigned char *p,*ep,*tot,*op,*opp;
116  long len;
117  int tag,xclass,ret=0;
118  int nl,hl,j,r;
119  ASN1_OBJECT *o=NULL;
120  ASN1_OCTET_STRING *os=NULL;
121  /* ASN1_BMPSTRING *bmp=NULL;*/
122  int dump_indent;
123 
124 #if 0
125  dump_indent = indent;
126 #else
127  dump_indent = 6; /* Because we know BIO_dump_indent() */
128 #endif
129  p= *pp;
130  tot=p+length;
131  op=p-1;
132  while ((p < tot) && (op < p))
133  {
134  op=p;
135  j=ASN1_get_object(&p,&len,&tag,&xclass,length);
136 #ifdef LINT
137  j=j;
138 #endif
139  if (j & 0x80)
140  {
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  /* if j == 0x21 it is a constructed indefinite length object */
149  if (BIO_printf(bp,"%5ld:",(long)offset+(long)(op- *pp))
150  <= 0) goto end;
151 
152  if (j != (V_ASN1_CONSTRUCTED | 1))
153  {
154  if (BIO_printf(bp,"d=%-2d hl=%ld l=%4ld ",
155  depth,(long)hl,len) <= 0)
156  goto end;
157  }
158  else
159  {
160  if (BIO_printf(bp,"d=%-2d hl=%ld l=inf ",
161  depth,(long)hl) <= 0)
162  goto end;
163  }
164  if (!asn1_print_info(bp,tag,xclass,j,(indent)?depth:0))
165  goto end;
166  if (j & V_ASN1_CONSTRUCTED)
167  {
168  ep=p+len;
169  if (BIO_write(bp,"\n",1) <= 0) goto end;
170  if (len > length)
171  {
172  BIO_printf(bp,
173  "length is greater than %ld\n",length);
174  ret=0;
175  goto end;
176  }
177  if ((j == 0x21) && (len == 0))
178  {
179  for (;;)
180  {
181  r=asn1_parse2(bp,&p,(long)(tot-p),
182  offset+(p - *pp),depth+1,
183  indent,dump);
184  if (r == 0) { ret=0; goto end; }
185  if ((r == 2) || (p >= tot)) break;
186  }
187  }
188  else
189  while (p < ep)
190  {
191  r=asn1_parse2(bp,&p,(long)len,
192  offset+(p - *pp),depth+1,
193  indent,dump);
194  if (r == 0) { ret=0; goto end; }
195  }
196  }
197  else if (xclass != 0)
198  {
199  p+=len;
200  if (BIO_write(bp,"\n",1) <= 0) goto end;
201  }
202  else
203  {
204  nl=0;
205  if ( (tag == V_ASN1_PRINTABLESTRING) ||
206  (tag == V_ASN1_T61STRING) ||
207  (tag == V_ASN1_IA5STRING) ||
208  (tag == V_ASN1_VISIBLESTRING) ||
209  (tag == V_ASN1_NUMERICSTRING) ||
210  (tag == V_ASN1_UTF8STRING) ||
211  (tag == V_ASN1_UTCTIME) ||
212  (tag == V_ASN1_GENERALIZEDTIME))
213  {
214  if (BIO_write(bp,":",1) <= 0) goto end;
215  if ((len > 0) &&
216  BIO_write(bp,(const char *)p,(int)len)
217  != (int)len)
218  goto end;
219  }
220  else if (tag == V_ASN1_OBJECT)
221  {
222  opp=op;
223  if (d2i_ASN1_OBJECT(&o,&opp,len+hl) != NULL)
224  {
225  if (BIO_write(bp,":",1) <= 0) goto end;
226  i2a_ASN1_OBJECT(bp,o);
227  }
228  else
229  {
230  if (BIO_write(bp,":BAD OBJECT",11) <= 0)
231  goto end;
232  }
233  }
234  else if (tag == V_ASN1_BOOLEAN)
235  {
236  int ii;
237 
238  opp=op;
239  ii=d2i_ASN1_BOOLEAN(NULL,&opp,len+hl);
240  if (ii < 0)
241  {
242  if (BIO_write(bp,"Bad boolean\n",12) <= 0)
243  goto end;
244  }
245  BIO_printf(bp,":%d",ii);
246  }
247  else if (tag == V_ASN1_BMPSTRING)
248  {
249  /* do the BMP thang */
250  }
251  else if (tag == V_ASN1_OCTET_STRING)
252  {
253  int i,printable=1;
254 
255  opp=op;
256  os=d2i_ASN1_OCTET_STRING(NULL,&opp,len+hl);
257  if (os != NULL && os->length > 0)
258  {
259  opp = os->data;
260  /* testing whether the octet string is
261  * printable */
262  for (i=0; i<os->length; i++)
263  {
264  if (( (opp[i] < ' ') &&
265  (opp[i] != '\n') &&
266  (opp[i] != '\r') &&
267  (opp[i] != '\t')) ||
268  (opp[i] > '~'))
269  {
270  printable=0;
271  break;
272  }
273  }
274  if (printable)
275  /* printable string */
276  {
277  if (BIO_write(bp,":",1) <= 0)
278  goto end;
279  if (BIO_write(bp,(const char *)opp,
280  os->length) <= 0)
281  goto end;
282  }
283  else if (!dump)
284  /* not printable => print octet string
285  * as hex dump */
286  {
287  if (BIO_write(bp,"[HEX DUMP]:",11) <= 0)
288  goto end;
289  for (i=0; i<os->length; i++)
290  {
291  if (BIO_printf(bp,"%02X"
292  , opp[i]) <= 0)
293  goto end;
294  }
295  }
296  else
297  /* print the normal dump */
298  {
299  if (!nl)
300  {
301  if (BIO_write(bp,"\n",1) <= 0)
302  goto end;
303  }
304  if (BIO_dump_indent(bp,
305  (const char *)opp,
306  ((dump == -1 || dump >
307  os->length)?os->length:dump),
308  dump_indent) <= 0)
309  goto end;
310  nl=1;
311  }
312  }
313  if (os != NULL)
314  {
315  M_ASN1_OCTET_STRING_free(os);
316  os=NULL;
317  }
318  }
319  else if (tag == V_ASN1_INTEGER)
320  {
321  ASN1_INTEGER *bs;
322  int i;
323 
324  opp=op;
325  bs=d2i_ASN1_INTEGER(NULL,&opp,len+hl);
326  if (bs != NULL)
327  {
328  if (BIO_write(bp,":",1) <= 0) goto end;
329  if (bs->type == V_ASN1_NEG_INTEGER)
330  if (BIO_write(bp,"-",1) <= 0)
331  goto end;
332  for (i=0; i<bs->length; i++)
333  {
334  if (BIO_printf(bp,"%02X",
335  bs->data[i]) <= 0)
336  goto end;
337  }
338  if (bs->length == 0)
339  {
340  if (BIO_write(bp,"00",2) <= 0)
341  goto end;
342  }
343  }
344  else
345  {
346  if (BIO_write(bp,"BAD INTEGER",11) <= 0)
347  goto end;
348  }
349  M_ASN1_INTEGER_free(bs);
350  }
351  else if (tag == V_ASN1_ENUMERATED)
352  {
353  ASN1_ENUMERATED *bs;
354  int i;
355 
356  opp=op;
357  bs=d2i_ASN1_ENUMERATED(NULL,&opp,len+hl);
358  if (bs != NULL)
359  {
360  if (BIO_write(bp,":",1) <= 0) goto end;
361  if (bs->type == V_ASN1_NEG_ENUMERATED)
362  if (BIO_write(bp,"-",1) <= 0)
363  goto end;
364  for (i=0; i<bs->length; i++)
365  {
366  if (BIO_printf(bp,"%02X",
367  bs->data[i]) <= 0)
368  goto end;
369  }
370  if (bs->length == 0)
371  {
372  if (BIO_write(bp,"00",2) <= 0)
373  goto end;
374  }
375  }
376  else
377  {
378  if (BIO_write(bp,"BAD ENUMERATED",11) <= 0)
379  goto end;
380  }
381  M_ASN1_ENUMERATED_free(bs);
382  }
383  else if (len > 0 && dump)
384  {
385  if (!nl)
386  {
387  if (BIO_write(bp,"\n",1) <= 0)
388  goto end;
389  }
390  if (BIO_dump_indent(bp,(const char *)p,
391  ((dump == -1 || dump > len)?len:dump),
392  dump_indent) <= 0)
393  goto end;
394  nl=1;
395  }
396 
397  if (!nl)
398  {
399  if (BIO_write(bp,"\n",1) <= 0) goto end;
400  }
401  p+=len;
402  if ((tag == V_ASN1_EOC) && (xclass == 0))
403  {
404  ret=2; /* End of sequence */
405  goto end;
406  }
407  }
408  length-=len;
409  }
410  ret=1;
411 end:
412  if (o != NULL) ASN1_OBJECT_free(o);
413  if (os != NULL) M_ASN1_OCTET_STRING_free(os);
414  *pp=p;
415  return(ret);
416  }
417 
418 const char *ASN1_tag2str(int tag)
419 {
420  static const char * const tag2str[] = {
421  "EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING", /* 0-4 */
422  "NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL", /* 5-9 */
423  "ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>", /* 10-13 */
424  "<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET", /* 15-17 */
425  "NUMERICSTRING", "PRINTABLESTRING", "T61STRING", /* 18-20 */
426  "VIDEOTEXSTRING", "IA5STRING", "UTCTIME","GENERALIZEDTIME", /* 21-24 */
427  "GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING", /* 25-27 */
428  "UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING" /* 28-30 */
429  };
430 
431  if((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED))
432  tag &= ~0x100;
433 
434  if(tag < 0 || tag > 30) return "(unknown)";
435  return tag2str[tag];
436 }
437 
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