asn1_print.c revision 178825 
1/*
2 * Copyright (c) 1997 - 2005 Kungliga Tekniska H�gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "der_locl.h"
35#include <com_err.h>
36#include <sys/types.h>
37#include <sys/stat.h>
38#include <getarg.h>
39#include <err.h>
40#include <der.h>
41
42RCSID("$Id: asn1_print.c 19539 2006-12-28 17:15:05Z lha $");
43
44static int indent_flag = 1;
45
46static unsigned long indefinite_form_loop;
47static unsigned long indefinite_form_loop_max = 10000;
48
49static size_t
50loop (unsigned char *buf, size_t len, int indent)
51{
52    unsigned char *start_buf = buf;
53
54    while (len > 0) {
55	int ret;
56	Der_class class;
57	Der_type type;
58	unsigned int tag;
59	size_t sz;
60	size_t length;
61	size_t loop_length = 0;
62	int end_tag = 0;
63	const char *tagname;
64
65	ret = der_get_tag (buf, len, &class, &type, &tag, &sz);
66	if (ret)
67	    errx (1, "der_get_tag: %s", error_message (ret));
68	if (sz > len)
69	    errx (1, "unreasonable length (%u) > %u",
70		  (unsigned)sz, (unsigned)len);
71	buf += sz;
72	len -= sz;
73	if (indent_flag) {
74	    int i;
75	    for (i = 0; i < indent; ++i)
76		printf (" ");
77	}
78	printf ("%s %s ", der_get_class_name(class), der_get_type_name(type));
79	tagname = der_get_tag_name(tag);
80	if (class == ASN1_C_UNIV && tagname != NULL)
81	    printf ("%s = ", tagname);
82	else
83	    printf ("tag %d = ", tag);
84	ret = der_get_length (buf, len, &length, &sz);
85	if (ret)
86	    errx (1, "der_get_tag: %s", error_message (ret));
87	if (sz > len)
88	    errx (1, "unreasonable tag length (%u) > %u",
89		  (unsigned)sz, (unsigned)len);
90	buf += sz;
91	len -= sz;
92	if (length == ASN1_INDEFINITE) {
93	    if ((class == ASN1_C_UNIV && type == PRIM && tag == UT_OctetString) ||
94		(class == ASN1_C_CONTEXT && type == CONS) ||
95		(class == ASN1_C_UNIV && type == CONS && tag == UT_Sequence) ||
96		(class == ASN1_C_UNIV && type == CONS && tag == UT_Set)) {
97		printf("*INDEFINITE FORM*");
98	    } else {
99		fflush(stdout);
100		errx(1, "indef form used on unsupported object");
101	    }
102	    end_tag = 1;
103	    if (indefinite_form_loop > indefinite_form_loop_max)
104		errx(1, "indefinite form used recursively more then %lu "
105		     "times, aborting", indefinite_form_loop_max);
106	    indefinite_form_loop++;
107	    length = len;
108	} else if (length > len) {
109	    printf("\n");
110	    fflush(stdout);
111	    errx (1, "unreasonable inner length (%u) > %u",
112		  (unsigned)length, (unsigned)len);
113	}
114	if (class == ASN1_C_CONTEXT || class == ASN1_C_APPL) {
115	    printf ("%lu bytes [%u]", (unsigned long)length, tag);
116	    if (type == CONS) {
117		printf("\n");
118		loop_length = loop (buf, length, indent + 2);
119	    } else {
120		printf(" IMPLICIT content\n");
121	    }
122	} else if (class == ASN1_C_UNIV) {
123	    switch (tag) {
124	    case UT_EndOfContent:
125		printf (" INDEFINITE length was %lu\n",
126			(unsigned long)(buf - start_buf));
127		break;
128	    case UT_Set :
129	    case UT_Sequence :
130		printf ("%lu bytes {\n", (unsigned long)length);
131		loop_length = loop (buf, length, indent + 2);
132		if (indent_flag) {
133		    int i;
134		    for (i = 0; i < indent; ++i)
135			printf (" ");
136		    printf ("}\n");
137		} else
138		    printf ("} indent = %d\n", indent / 2);
139		break;
140	    case UT_Integer : {
141		int val;
142
143		if (length <= sizeof(val)) {
144		    ret = der_get_integer (buf, length, &val, NULL);
145		    if (ret)
146			errx (1, "der_get_integer: %s", error_message (ret));
147		    printf ("integer %d\n", val);
148		} else {
149		    heim_integer vali;
150		    char *p;
151
152		    ret = der_get_heim_integer(buf, length, &vali, NULL);
153		    if (ret)
154			errx (1, "der_get_heim_integer: %s",
155			      error_message (ret));
156		    ret = der_print_hex_heim_integer(&vali, &p);
157		    if (ret)
158			errx (1, "der_print_hex_heim_integer: %s",
159			      error_message (ret));
160		    printf ("BIG NUM integer: length %lu %s\n",
161			    (unsigned long)length, p);
162		    free(p);
163		}
164		break;
165	    }
166	    case UT_OctetString : {
167		heim_octet_string str;
168		int i;
169		unsigned char *uc;
170
171		ret = der_get_octet_string (buf, length, &str, NULL);
172		if (ret)
173		    errx (1, "der_get_octet_string: %s", error_message (ret));
174		printf ("(length %lu), ", (unsigned long)length);
175		uc = (unsigned char *)str.data;
176		for (i = 0; i < min(16,length); ++i)
177		    printf ("%02x", uc[i]);
178		printf ("\n");
179		free (str.data);
180		break;
181	    }
182	    case UT_GeneralizedTime :
183	    case UT_GeneralString :
184	    case UT_PrintableString :
185	    case UT_VisibleString : {
186		heim_general_string str;
187
188		ret = der_get_general_string (buf, length, &str, NULL);
189		if (ret)
190		    errx (1, "der_get_general_string: %s",
191			  error_message (ret));
192		printf ("\"%s\"\n", str);
193		free (str);
194		break;
195	    }
196	    case UT_OID: {
197		heim_oid o;
198		char *p;
199
200		ret = der_get_oid(buf, length, &o, NULL);
201		if (ret)
202		    errx (1, "der_get_oid: %s", error_message (ret));
203		ret = der_print_heim_oid(&o, '.', &p);
204		der_free_oid(&o);
205		if (ret)
206		    errx (1, "der_print_heim_oid: %s", error_message (ret));
207		printf("%s\n", p);
208		free(p);
209
210		break;
211	    }
212	    case UT_Enumerated: {
213		int num;
214
215		ret = der_get_integer (buf, length, &num, NULL);
216		if (ret)
217		    errx (1, "der_get_enum: %s", error_message (ret));
218
219		printf("%u\n", num);
220		break;
221	    }
222	    default :
223		printf ("%lu bytes\n", (unsigned long)length);
224		break;
225	    }
226	}
227	if (end_tag) {
228	    if (loop_length == 0)
229		errx(1, "zero length INDEFINITE data ? indent = %d\n",
230		     indent / 2);
231	    if (loop_length < length)
232		length = loop_length;
233	    if (indefinite_form_loop == 0)
234		errx(1, "internal error in indefinite form loop detection");
235	    indefinite_form_loop--;
236	} else if (loop_length)
237	    errx(1, "internal error for INDEFINITE form");
238	buf += length;
239	len -= length;
240    }
241    return 0;
242}
243
244static int
245doit (const char *filename)
246{
247    int fd = open (filename, O_RDONLY);
248    struct stat sb;
249    unsigned char *buf;
250    size_t len;
251    int ret;
252
253    if(fd < 0)
254	err (1, "opening %s for read", filename);
255    if (fstat (fd, &sb) < 0)
256	err (1, "stat %s", filename);
257    len = sb.st_size;
258    buf = emalloc (len);
259    if (read (fd, buf, len) != len)
260	errx (1, "read failed");
261    close (fd);
262    ret = loop (buf, len, 0);
263    free (buf);
264    return 0;
265}
266
267
268static int version_flag;
269static int help_flag;
270struct getargs args[] = {
271    { "indent", 0, arg_negative_flag, &indent_flag },
272    { "version", 0, arg_flag, &version_flag },
273    { "help", 0, arg_flag, &help_flag }
274};
275int num_args = sizeof(args) / sizeof(args[0]);
276
277static void
278usage(int code)
279{
280    arg_printusage(args, num_args, NULL, "dump-file");
281    exit(code);
282}
283
284int
285main(int argc, char **argv)
286{
287    int optidx = 0;
288
289    setprogname (argv[0]);
290    initialize_asn1_error_table ();
291    if(getarg(args, num_args, argc, argv, &optidx))
292	usage(1);
293    if(help_flag)
294	usage(0);
295    if(version_flag) {
296	print_version(NULL);
297	exit(0);
298    }
299    argv += optidx;
300    argc -= optidx;
301    if (argc != 1)
302	usage (1);
303    return doit (argv[0]);
304}
305