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heimdal/lib/asn1/asn1_print.c
Nicolas Williams 1fe3d293e1 asn1: Fix warnings
2022-01-14 12:25:43 -06:00

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/*
* Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Portions Copyright (c) 2009 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "der_locl.h"
#include <com_err.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dlfcn.h>
#include <getarg.h>
#include <err.h>
#include <der.h>
#include "cms_asn1.h"
#include "digest_asn1.h"
#include "krb5_asn1.h"
#include "kx509_asn1.h"
#include "ocsp_asn1.h"
#include "pkcs10_asn1.h"
#include "pkcs12_asn1.h"
#include "pkcs8_asn1.h"
#include "pkcs9_asn1.h"
#include "pkinit_asn1.h"
#include "rfc2459_asn1.h"
#include "rfc4108_asn1.h"
#ifdef ASN1_PRINT_SUPPORTED
#include "x690sample_template_asn1.h"
#else
#include "x690sample_asn1.h"
#endif
static int quiet_flag = 0;
static int print_flag = 1;
static int test_copy_flag;
static int test_encode_flag;
static int sequence_flag;
static int try_all_flag;
static int indent_flag = 1;
static int inner_flag;
static unsigned long indefinite_form_loop;
static unsigned long indefinite_form_loop_max = 10000;
typedef size_t (*lengther)(void *);
typedef int (*copyer)(const void *, void *);
typedef int (*encoder)(unsigned char *, size_t, void *, size_t *);
typedef int (*decoder)(const unsigned char *, size_t, void *, size_t *);
typedef char *(*printer)(const void *, int);
typedef void (*releaser)(void *);
const struct types {
const char *name;
size_t sz;
copyer cpy;
lengther len;
decoder decode;
encoder encode;
printer print;
releaser release;
} types[] = {
#define ASN1_SYM_INTVAL(n, gn, gns, i)
#define ASN1_SYM_OID(n, gn, gns)
#ifdef ASN1_PRINT_SUPPORTED
#define ASN1_SYM_TYPE(n, gn, gns) \
{ \
n, \
sizeof(gns), \
(copyer)copy_ ## gns, \
(lengther)length_ ## gns, \
(decoder)decode_ ## gns, \
(encoder)encode_ ## gns, \
(printer)print_ ## gns, \
(releaser)free_ ## gns, \
},
#else
#define ASN1_SYM_TYPE(n, gn, gns) \
{ \
n, \
sizeof(gns), \
(copyer)copy_ ## gns, \
(lengther)length_ ## gns, \
(decoder)decode_ ## gns, \
(encoder)encode_ ## gns, \
0, \
(releaser)free_ ## gns, \
},
#endif
#include "cms_asn1_syms.c"
#include "digest_asn1_syms.c"
#include "krb5_asn1_syms.c"
#include "kx509_asn1_syms.c"
#include "ocsp_asn1_syms.c"
#include "pkcs10_asn1_syms.c"
#include "pkcs12_asn1_syms.c"
#include "pkcs8_asn1_syms.c"
#include "pkcs9_asn1_syms.c"
#include "pkinit_asn1_syms.c"
#include "rfc2459_asn1_syms.c"
#include "rfc4108_asn1_syms.c"
#ifdef ASN1_PRINT_SUPPORTED
#include "x690sample_template_asn1_syms.c"
#else
#include "x690sample_asn1_syms.c"
#endif
};
struct types sorted_types[sizeof(types)/sizeof(types[0])];
static size_t
loop (unsigned char *buf, size_t len, int indent)
{
unsigned char *start_buf = buf;
while (len > 0) {
int ret;
Der_class class;
Der_type type;
unsigned int tag;
size_t sz;
size_t length;
size_t loop_length = 0;
int end_tag = 0;
const char *tagname;
ret = der_get_tag (buf, len, &class, &type, &tag, &sz);
if (ret)
errx (1, "der_get_tag: %s", error_message (ret));
if (sz > len)
errx (1, "unreasonable length (%u) > %u",
(unsigned)sz, (unsigned)len);
buf += sz;
len -= sz;
if (indent_flag) {
int i;
for (i = 0; i < indent; ++i)
printf (" ");
}
printf ("%s %s ", der_get_class_name(class), der_get_type_name(type));
tagname = der_get_tag_name(tag);
if (class == ASN1_C_UNIV && tagname != NULL)
printf ("%s = ", tagname);
else
printf ("tag %d = ", tag);
ret = der_get_length (buf, len, &length, &sz);
if (ret)
errx (1, "der_get_tag: %s", error_message (ret));
if (sz > len)
errx (1, "unreasonable tag length (%u) > %u",
(unsigned)sz, (unsigned)len);
buf += sz;
len -= sz;
if (length == ASN1_INDEFINITE) {
if ((class == ASN1_C_UNIV && type == PRIM && tag == UT_OctetString) ||
(class == ASN1_C_CONTEXT && type == CONS) ||
(class == ASN1_C_UNIV && type == CONS && tag == UT_Sequence) ||
(class == ASN1_C_UNIV && type == CONS && tag == UT_Set)) {
printf("*INDEFINITE FORM*");
} else {
fflush(stdout);
errx(1, "indef form used on unsupported object");
}
end_tag = 1;
if (indefinite_form_loop > indefinite_form_loop_max)
errx(1, "indefinite form used recursively more then %lu "
"times, aborting", indefinite_form_loop_max);
indefinite_form_loop++;
length = len;
} else if (length > len) {
printf("\n");
fflush(stdout);
errx (1, "unreasonable inner length (%u) > %u",
(unsigned)length, (unsigned)len);
}
if (class == ASN1_C_CONTEXT || class == ASN1_C_APPL) {
printf ("%lu bytes [%u]", (unsigned long)length, tag);
if (type == CONS) {
printf("\n");
loop_length = loop (buf, length, indent + 2);
} else {
printf(" IMPLICIT content\n");
}
} else if (class == ASN1_C_UNIV) {
switch (tag) {
case UT_EndOfContent:
printf (" INDEFINITE length was %lu\n",
(unsigned long)(buf - start_buf));
break;
case UT_Set :
case UT_Sequence :
printf ("%lu bytes {\n", (unsigned long)length);
loop_length = loop (buf, length, indent + 2);
if (indent_flag) {
int i;
for (i = 0; i < indent; ++i)
printf (" ");
printf ("}\n");
} else
printf ("} indent = %d\n", indent / 2);
break;
case UT_Integer : {
int val;
if (length <= sizeof(val)) {
ret = der_get_integer (buf, length, &val, NULL);
if (ret)
errx (1, "der_get_integer: %s", error_message (ret));
printf ("integer %d\n", val);
} else {
heim_integer vali;
char *p;
ret = der_get_heim_integer(buf, length, &vali, NULL);
if (ret)
errx (1, "der_get_heim_integer: %s",
error_message (ret));
ret = der_print_hex_heim_integer(&vali, &p);
if (ret)
errx (1, "der_print_hex_heim_integer: %s",
error_message (ret));
printf ("BIG NUM integer: length %lu %s\n",
(unsigned long)length, p);
free(p);
}
break;
}
case UT_OctetString : {
heim_octet_string str;
size_t i;
ret = der_get_octet_string (buf, length, &str, NULL);
if (ret)
errx (1, "der_get_octet_string: %s", error_message (ret));
printf ("(length %lu), ", (unsigned long)length);
if (inner_flag) {
Der_class class2;
Der_type type2;
unsigned int tag2;
ret = der_get_tag(str.data, str.length,
&class2, &type2, &tag2, &sz);
if (ret || sz > str.length ||
type2 != CONS || tag2 != UT_Sequence)
goto just_an_octet_string;
printf("{\n");
loop (str.data, str.length, indent + 2);
for (i = 0; i < indent; ++i)
printf (" ");
printf ("}\n");
} else {
unsigned char *uc;
just_an_octet_string:
uc = (unsigned char *)str.data;
for (i = 0; i < min(16,length); ++i)
printf ("%02x", uc[i]);
printf ("\n");
}
free (str.data);
break;
}
case UT_IA5String :
case UT_PrintableString : {
heim_printable_string str;
unsigned char *s;
size_t n;
memset(&str, 0, sizeof(str));
ret = der_get_printable_string (buf, length, &str, NULL);
if (ret)
errx (1, "der_get_general_string: %s",
error_message (ret));
s = str.data;
printf("\"");
for (n = 0; n < str.length; n++) {
if (isprint((int)s[n]))
printf ("%c", s[n]);
else
printf ("#%02x", s[n]);
}
printf("\"\n");
der_free_printable_string(&str);
break;
}
case UT_GeneralizedTime :
case UT_GeneralString :
case UT_VisibleString :
case UT_UTF8String : {
heim_general_string str;
ret = der_get_general_string (buf, length, &str, NULL);
if (ret)
errx (1, "der_get_general_string: %s",
error_message (ret));
printf ("\"%s\"\n", str);
free (str);
break;
}
case UT_OID: {
heim_oid o;
char *p;
ret = der_get_oid(buf, length, &o, NULL);
if (ret)
errx (1, "der_get_oid: %s", error_message (ret));
ret = der_print_heim_oid_sym(&o, '.', &p);
der_free_oid(&o);
if (ret)
errx (1, "der_print_heim_oid_sym: %s", error_message (ret));
printf("%s\n", p);
free(p);
break;
}
case UT_Enumerated: {
int num;
ret = der_get_integer (buf, length, &num, NULL);
if (ret)
errx (1, "der_get_enum: %s", error_message (ret));
printf("%u\n", num);
break;
}
default :
printf ("%lu bytes\n", (unsigned long)length);
break;
}
}
if (end_tag) {
if (loop_length == 0)
errx(1, "zero length INDEFINITE data ? indent = %d\n",
indent / 2);
if (loop_length < length)
length = loop_length;
if (indefinite_form_loop == 0)
errx(1, "internal error in indefinite form loop detection");
indefinite_form_loop--;
} else if (loop_length)
errx(1, "internal error for INDEFINITE form");
buf += length;
len -= length;
}
return 0;
}
static int
type_cmp(const void *va, const void *vb)
{
const struct types *ta = (const struct types *)va;
const struct types *tb = (const struct types *)vb;
return strcmp(ta->name, tb->name);
}
static int
dotype(unsigned char *buf, size_t len, char **argv, size_t *size)
{
const char *typename = "";
size_t matches = 0;
size_t sz;
size_t tried = 0;
size_t i = 0;
void *v;
int ret = 0;
*size = len;
memcpy(sorted_types, types, sizeof(types));
qsort(sorted_types,
sizeof(types)/sizeof(types[0]),
sizeof(types[0]),
type_cmp);
while ((try_all_flag && i < sizeof(types)/sizeof(types[0])) ||
(typename = (argv++)[0])) {
if (try_all_flag) {
typename = sorted_types[i].name;
} else {
size_t right = sizeof(types)/sizeof(types[0]) - 1;
size_t left = 0;
size_t mid = (left + right) >> 1;
int c = -1;
while (left <= right) {
mid = (left + right) >> 1;
c = strcmp(sorted_types[mid].name, typename);
if (c < 0)
left = mid + 1;
else if (c > 0)
right = mid - 1;
else
break;
}
if (c != 0)
errx(1, "Type %s not found", typename);
i = mid;
}
v = ecalloc(1, sorted_types[i].sz);
ret = sorted_types[i].decode(buf, len, v, &sz);
if (ret == 0) {
matches++;
if (!quiet_flag && sz == len) {
fprintf(stderr, "Match: %s\n", typename);
} else if (sequence_flag) {
*size = sz;
} else if (!quiet_flag) {
fprintf(stderr, "Prefix match: %s\n", typename);
}
if (print_flag) {
static int warned = 0;
if (!sorted_types[i].print) {
if (!warned)
warnx("Missing print support; try enabling / not "
"disabling ASN.1 templating in build "
"configuration");
warned = 1;
} else {
char *s;
s = sorted_types[i].print(v, indent_flag ? ASN1_PRINT_INDENT : 0);
if (!s)
err(1, "Could not print %s\n", typename);
if (!quiet_flag)
printf("%s\n", s);
free(s);
}
}
if (test_encode_flag) {
unsigned char *der = emalloc(sz);
size_t wants = sorted_types[i].len(v);
if (wants != sz)
errx(1, "Encoding will not round trip");
ret = sorted_types[i].encode(der + (sz - 1), sz, v, &sz);
if (ret != 0)
errx(1, "Encoding failed");
if (memcmp(buf, der, sz) != 0)
errx(1, "Encoding did not round trip");
free(der);
}
if (test_copy_flag) {
void *vcpy = ecalloc(1, sorted_types[i].sz);
ret = sorted_types[i].cpy(v, vcpy);
if (ret != 0)
errx(1, "Copy function failed");
if (test_encode_flag) {
unsigned char *der = emalloc(sz);
size_t wants = sorted_types[i].len(vcpy);
if (wants != sz)
errx(1, "Encoding of copy will not round trip");
ret = sorted_types[i].encode(der + (sz - 1), sz, vcpy, &sz);
if (ret != 0)
errx(1, "Encoding of copy failed");
if (memcmp(buf, der, sz) != 0)
errx(1, "Encoding of copy did not round trip");
free(der);
}
sorted_types[i].release(vcpy);
free(vcpy);
}
}
sorted_types[i].release(v);
free(v);
tried++;
i++;
if (ret == 0 && !try_all_flag && !argv[0])
return 0;
if (!try_all_flag && argv[0])
continue;
if (try_all_flag) {
if (i < sizeof(types)/sizeof(types[0]))
continue;
if (matches)
break;
}
if (tried > 1)
errx(1, "No type matched the input value");
/* XXX Use com_err */
switch (ret) {
case ASN1_BAD_TIMEFORMAT:
errx(1, "Could not decode and print data as type %s: "
"Bad time format", typename);
case ASN1_MISSING_FIELD:
errx(1, "Could not decode and print data as type %s: "
"Missing required field", typename);
case ASN1_MISPLACED_FIELD:
errx(1, "Could not decode and print data as type %s: "
"Fields out of order", typename);
case ASN1_TYPE_MISMATCH:
errx(1, "Could not decode and print data as type %s: "
"Type mismatch", typename);
case ASN1_OVERFLOW:
errx(1, "Could not decode and print data as type %s: "
"DER value too large", typename);
case ASN1_OVERRUN:
errx(1, "Could not decode and print data as type %s: "
"DER value too short", typename);
case ASN1_BAD_ID:
errx(1, "Could not decode and print data as type %s: "
"DER tag is unexpected", typename);
case ASN1_BAD_LENGTH:
errx(1, "Could not decode and print data as type %s: "
"DER length does not match value", typename);
case ASN1_BAD_FORMAT:
case ASN1_PARSE_ERROR:
errx(1, "Could not decode and print data as type %s: "
"DER badly formatted", typename);
case ASN1_EXTRA_DATA:
errx(1, "Could not decode and print data as type %s: "
"Extra data past end of end structure", typename);
case ASN1_BAD_CHARACTER:
errx(1, "Could not decode and print data as type %s: "
"Invalid character encoding in string", typename);
case ASN1_MIN_CONSTRAINT:
errx(1, "Could not decode and print data as type %s: "
"Too few elements", typename);
case ASN1_MAX_CONSTRAINT:
errx(1, "Could not decode and print data as type %s: "
"Too many elements", typename);
case ASN1_EXACT_CONSTRAINT:
errx(1, "Could not decode and print data as type %s: "
"Wrong count of elements", typename);
case ASN1_INDEF_OVERRUN:
errx(1, "Could not decode and print data as type %s: "
"BER indefinte encoding overun", typename);
case ASN1_INDEF_UNDERRUN:
errx(1, "Could not decode and print data as type %s: "
"BER indefinte encoding underun", typename);
case ASN1_GOT_BER:
errx(1, "Could not decode and print data as type %s: "
"BER encoding when DER expected", typename);
case ASN1_INDEF_EXTRA_DATA:
errx(1, "Could not decode and print data as type %s: "
"End-of-contents tag contains data", typename);
default:
errx(1, "Could not decode and print data as type %s", typename);
}
}
return 0;
}
static int
doit(char **argv)
{
int fd = open(argv[0], O_RDONLY);
struct stat sb;
unsigned char *buf;
size_t len;
int ret;
if(fd < 0)
err(1, "opening %s for read", argv[0]);
if (fstat (fd, &sb) < 0)
err(1, "stat %s", argv[0]);
len = sb.st_size;
buf = emalloc(len);
if (read(fd, buf, len) != len)
errx(1, "read failed");
close(fd);
argv++;
if (argv[0] || try_all_flag) {
size_t off = 0;
size_t sz = 0;
do {
ret = dotype(buf + off, len - off, argv, &sz);
off += sz;
} while (ret == 0 && sequence_flag && off < len);
} else {
ret = loop(buf, len, 0);
}
free(buf);
return ret;
}
static int list_types_flag;
static int version_flag;
static int help_flag;
struct getargs args[] = {
{ "indent", 'i', arg_negative_flag, &indent_flag,
"\tdo not indent dump", NULL },
{ "inner", 'I', arg_flag, &inner_flag,
"\ttry to parse inner structures of OCTET STRING", NULL },
{ "list-types", 'l', arg_flag, &list_types_flag,
"\tlist ASN.1 types known to this program", NULL },
{ "try-all-types", 'A', arg_flag, &try_all_flag,
"\ttry all known types", NULL },
{ "raw-sequence", 'S', arg_flag, &sequence_flag,
"\ttry parsing leftover data", NULL },
{ "test-encode", 0, arg_flag, &test_encode_flag,
"\ttest encode round trip (for memory debugging and fuzzing)", NULL },
{ "test-copy", 0, arg_flag, &test_copy_flag,
"\ttest copy operation (for memory debugging and fuzzing)", NULL },
{ "print", 'n', arg_negative_flag, &print_flag,
"\ttest copy operation (for memory debugging and fuzzing)", NULL },
{ "quiet", 'q', arg_flag, &quiet_flag,
"\tOutput nothing (exit status 0 means type matched)", NULL },
{ "version", 'v', arg_flag, &version_flag, NULL, NULL },
{ "help", 'h', arg_flag, &help_flag, NULL, NULL }
};
int num_args = sizeof(args) / sizeof(args[0]);
static void
usage(int code)
{
arg_printusage(args, num_args, NULL, "dump-file [TypeName [TypeName ...]]");
exit(code);
}
int
main(int argc, char **argv)
{
int optidx = 0;
setprogname(argv[0]);
initialize_asn1_error_table();
if (getarg(args, num_args, argc, argv, &optidx))
usage(1);
if (help_flag)
usage(0);
if (version_flag) {
print_version(NULL);
exit(0);
}
argv += optidx;
argc -= optidx;
if (sequence_flag && try_all_flag)
errx(1, "--raw-sequence and --try-all-types are mutually exclusive");
if (quiet_flag && !try_all_flag && argc < 2)
errx(1, "--quiet requires --try-all-types or that a TypeName be given");
if (!print_flag && !try_all_flag && argc < 2)
errx(1, "--no-print requires --try-all-types or that a TypeName be given");
if (list_types_flag) {
size_t i;
if (argc)
errx(1, "--list-types is exclusive of other options or arguments");
for (i = 0; i < sizeof(types)/sizeof(types[0]); i++)
printf("%s\n", types[i].name);
exit(0);
}
if (argc < 1)
usage(1);
return doit(argv);
}
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