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openssl/apps/asn1pars.c
Rich Salz 021410ea3f Check non-option arguments 
Make sure all commands check to see if there are any "extra" arguments
after the options, and print an error if so.

Made all error messages consistent (which is to say, minimal).

Fixes: #13527

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/13563)
2020-12-15 11:47:17 +01:00

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/*
* Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "apps.h"
#include "progs.h"
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/asn1t.h>
typedef enum OPTION_choice {
OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
OPT_INFORM, OPT_IN, OPT_OUT, OPT_INDENT, OPT_NOOUT,
OPT_OID, OPT_OFFSET, OPT_LENGTH, OPT_DUMP, OPT_DLIMIT,
OPT_STRPARSE, OPT_GENSTR, OPT_GENCONF, OPT_STRICTPEM,
OPT_ITEM
} OPTION_CHOICE;
const OPTIONS asn1parse_options[] = {
OPT_SECTION("General"),
{"help", OPT_HELP, '-', "Display this summary"},
{"oid", OPT_OID, '<', "file of extra oid definitions"},
OPT_SECTION("I/O"),
{"inform", OPT_INFORM, 'F', "input format - one of DER PEM"},
{"in", OPT_IN, '<', "input file"},
{"out", OPT_OUT, '>', "output file (output format is always DER)"},
{"noout", OPT_NOOUT, 0, "do not produce any output"},
{"offset", OPT_OFFSET, 'p', "offset into file"},
{"length", OPT_LENGTH, 'p', "length of section in file"},
{"strparse", OPT_STRPARSE, 'p',
"offset; a series of these can be used to 'dig'"},
{"genstr", OPT_GENSTR, 's', "string to generate ASN1 structure from"},
{OPT_MORE_STR, 0, 0, "into multiple ASN1 blob wrappings"},
{"genconf", OPT_GENCONF, 's', "file to generate ASN1 structure from"},
{"strictpem", OPT_STRICTPEM, 0,
"do not attempt base64 decode outside PEM markers"},
{"item", OPT_ITEM, 's', "item to parse and print"},
{OPT_MORE_STR, 0, 0, "(-inform will be ignored)"},
OPT_SECTION("Formatting"),
{"i", OPT_INDENT, 0, "indents the output"},
{"dump", OPT_DUMP, 0, "unknown data in hex form"},
{"dlimit", OPT_DLIMIT, 'p',
"dump the first arg bytes of unknown data in hex form"},
{NULL}
};
static int do_generate(char *genstr, const char *genconf, BUF_MEM *buf);
int asn1parse_main(int argc, char **argv)
{
ASN1_TYPE *at = NULL;
BIO *in = NULL, *b64 = NULL, *derout = NULL;
BUF_MEM *buf = NULL;
STACK_OF(OPENSSL_STRING) *osk = NULL;
char *genstr = NULL, *genconf = NULL;
char *infile = NULL, *oidfile = NULL, *derfile = NULL;
unsigned char *str = NULL;
char *name = NULL, *header = NULL, *prog;
const unsigned char *ctmpbuf;
int indent = 0, noout = 0, dump = 0, strictpem = 0, informat = FORMAT_PEM;
int offset = 0, ret = 1, i, j;
long num, tmplen;
unsigned char *tmpbuf;
unsigned int length = 0;
OPTION_CHOICE o;
const ASN1_ITEM *it = NULL;
prog = opt_init(argc, argv, asn1parse_options);
if ((osk = sk_OPENSSL_STRING_new_null()) == NULL) {
BIO_printf(bio_err, "%s: Memory allocation failure\n", prog);
goto end;
}
while ((o = opt_next()) != OPT_EOF) {
switch (o) {
case OPT_EOF:
case OPT_ERR:
opthelp:
BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
goto end;
case OPT_HELP:
opt_help(asn1parse_options);
ret = 0;
goto end;
case OPT_INFORM:
if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
goto opthelp;
break;
case OPT_IN:
infile = opt_arg();
break;
case OPT_OUT:
derfile = opt_arg();
break;
case OPT_INDENT:
indent = 1;
break;
case OPT_NOOUT:
noout = 1;
break;
case OPT_OID:
oidfile = opt_arg();
break;
case OPT_OFFSET:
offset = strtol(opt_arg(), NULL, 0);
break;
case OPT_LENGTH:
length = strtol(opt_arg(), NULL, 0);
break;
case OPT_DUMP:
dump = -1;
break;
case OPT_DLIMIT:
dump = strtol(opt_arg(), NULL, 0);
break;
case OPT_STRPARSE:
sk_OPENSSL_STRING_push(osk, opt_arg());
break;
case OPT_GENSTR:
genstr = opt_arg();
break;
case OPT_GENCONF:
genconf = opt_arg();
break;
case OPT_STRICTPEM:
strictpem = 1;
informat = FORMAT_PEM;
break;
case OPT_ITEM:
it = ASN1_ITEM_lookup(opt_arg());
if (it == NULL) {
size_t tmp;
BIO_printf(bio_err, "Unknown item name %s\n", opt_arg());
BIO_puts(bio_err, "Supported types:\n");
for (tmp = 0;; tmp++) {
it = ASN1_ITEM_get(tmp);
if (it == NULL)
break;
BIO_printf(bio_err, " %s\n", it->sname);
}
goto end;
}
break;
}
}
/* No extra args. */
argc = opt_num_rest();
if (argc != 0)
goto opthelp;
if (oidfile != NULL) {
in = bio_open_default(oidfile, 'r', FORMAT_TEXT);
if (in == NULL)
goto end;
OBJ_create_objects(in);
BIO_free(in);
}
if ((in = bio_open_default(infile, 'r', informat)) == NULL)
goto end;
if (derfile && (derout = bio_open_default(derfile, 'w', FORMAT_ASN1)) == NULL)
goto end;
if ((buf = BUF_MEM_new()) == NULL)
goto end;
if (strictpem) {
if (PEM_read_bio(in, &name, &header, &str, &num) != 1) {
BIO_printf(bio_err, "Error reading PEM file\n");
ERR_print_errors(bio_err);
goto end;
}
buf->data = (char *)str;
buf->length = buf->max = num;
} else {
if (!BUF_MEM_grow(buf, BUFSIZ * 8))
goto end; /* Pre-allocate :-) */
if (genstr || genconf) {
num = do_generate(genstr, genconf, buf);
if (num < 0) {
ERR_print_errors(bio_err);
goto end;
}
} else {
if (informat == FORMAT_PEM) {
BIO *tmp;
if ((b64 = BIO_new(BIO_f_base64())) == NULL)
goto end;
BIO_push(b64, in);
tmp = in;
in = b64;
b64 = tmp;
}
num = 0;
for (;;) {
if (!BUF_MEM_grow(buf, num + BUFSIZ))
goto end;
i = BIO_read(in, &(buf->data[num]), BUFSIZ);
if (i <= 0)
break;
num += i;
}
}
str = (unsigned char *)buf->data;
}
/* If any structs to parse go through in sequence */
if (sk_OPENSSL_STRING_num(osk)) {
tmpbuf = str;
tmplen = num;
for (i = 0; i < sk_OPENSSL_STRING_num(osk); i++) {
ASN1_TYPE *atmp;
int typ;
j = strtol(sk_OPENSSL_STRING_value(osk, i), NULL, 0);
if (j <= 0 || j >= tmplen) {
BIO_printf(bio_err, "'%s' is out of range\n",
sk_OPENSSL_STRING_value(osk, i));
continue;
}
tmpbuf += j;
tmplen -= j;
atmp = at;
ctmpbuf = tmpbuf;
at = d2i_ASN1_TYPE(NULL, &ctmpbuf, tmplen);
ASN1_TYPE_free(atmp);
if (!at) {
BIO_printf(bio_err, "Error parsing structure\n");
ERR_print_errors(bio_err);
goto end;
}
typ = ASN1_TYPE_get(at);
if ((typ == V_ASN1_OBJECT)
|| (typ == V_ASN1_BOOLEAN)
|| (typ == V_ASN1_NULL)) {
BIO_printf(bio_err, "Can't parse %s type\n", ASN1_tag2str(typ));
ERR_print_errors(bio_err);
goto end;
}
/* hmm... this is a little evil but it works */
tmpbuf = at->value.asn1_string->data;
tmplen = at->value.asn1_string->length;
}
str = tmpbuf;
num = tmplen;
}
if (offset < 0 || offset >= num) {
BIO_printf(bio_err, "Error: offset out of range\n");
goto end;
}
num -= offset;
if (length == 0 || length > (unsigned int)num)
length = (unsigned int)num;
if (derout != NULL) {
if (BIO_write(derout, str + offset, length) != (int)length) {
BIO_printf(bio_err, "Error writing output\n");
ERR_print_errors(bio_err);
goto end;
}
}
if (!noout) {
const unsigned char *p = str + offset;
if (it != NULL) {
ASN1_VALUE *value = ASN1_item_d2i(NULL, &p, length, it);
if (value == NULL) {
BIO_printf(bio_err, "Error parsing item %s\n", it->sname);
ERR_print_errors(bio_err);
goto end;
}
ASN1_item_print(bio_out, value, 0, it, NULL);
ASN1_item_free(value, it);
} else {
if (!ASN1_parse_dump(bio_out, p, length, indent, dump)) {
ERR_print_errors(bio_err);
goto end;
}
}
}
ret = 0;
end:
BIO_free(derout);
BIO_free(in);
BIO_free(b64);
if (ret != 0)
ERR_print_errors(bio_err);
BUF_MEM_free(buf);
OPENSSL_free(name);
OPENSSL_free(header);
ASN1_TYPE_free(at);
sk_OPENSSL_STRING_free(osk);
return ret;
}
static int do_generate(char *genstr, const char *genconf, BUF_MEM *buf)
{
CONF *cnf = NULL;
int len;
unsigned char *p;
ASN1_TYPE *atyp = NULL;
if (genconf != NULL) {
if ((cnf = app_load_config(genconf)) == NULL)
goto err;
if (genstr == NULL)
genstr = NCONF_get_string(cnf, "default", "asn1");
if (genstr == NULL) {
BIO_printf(bio_err, "Can't find 'asn1' in '%s'\n", genconf);
goto err;
}
}
atyp = ASN1_generate_nconf(genstr, cnf);
NCONF_free(cnf);
cnf = NULL;
if (atyp == NULL)
return -1;
len = i2d_ASN1_TYPE(atyp, NULL);
if (len <= 0)
goto err;
if (!BUF_MEM_grow(buf, len))
goto err;
p = (unsigned char *)buf->data;
i2d_ASN1_TYPE(atyp, &p);
ASN1_TYPE_free(atyp);
return len;
err:
NCONF_free(cnf);
ASN1_TYPE_free(atyp);
return -1;
}
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