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/*
* Copyright (C) 2015 Tobias Brunner
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <getopt.h>
#include <library.h>
static void usage(FILE *out, char *name)
{
fprintf(out, "Extract the ASN.1 subject DN from a certificate\n\n");
fprintf(out, "%s [OPTIONS]\n\n", name);
fprintf(out, "Options:\n");
fprintf(out, " -h, --help print this help.\n");
fprintf(out, " -i, --in=FILE certificate file (default STDIN).\n");
fprintf(out, " -f, --format=FORMAT output format (config, hex, base64, binary).\n");
fprintf(out, "\n");
}
/**
* Extract the binary ASN.1 subject DN from a certificate
*/
int main(int argc, char *argv[])
{
identification_t *id;
certificate_t *cert;
chunk_t chunk;
enum {
FORMAT_CONFIG,
FORMAT_HEX,
FORMAT_BASE64,
FORMAT_BINARY,
} format = FORMAT_CONFIG;
int fd = 0;
char *fmt;
library_init(NULL, "extract-dn");
atexit(library_deinit);
while (true)
{
struct option long_opts[] = {
{"help", no_argument, NULL, 'h' },
{"in", required_argument, NULL, 'i' },
{"format", required_argument, NULL, 'f' },
{0,0,0,0 },
};
switch (getopt_long(argc, argv, "hi:f:", long_opts, NULL))
{
case EOF:
break;
case 'h':
usage(stdout, argv[0]);
return 0;
case 'i':
fd = open(optarg, O_RDONLY);
if (fd == -1)
{
fprintf(stderr, "failed to open '%s': %s\n", optarg,
strerror(errno));
usage(stderr, argv[0]);
return 1;
}
continue;
case 'f':
if (streq(optarg, "hex"))
{
format = FORMAT_HEX;
}
else if (streq(optarg, "base64"))
{
format = FORMAT_BASE64;
}
else if (streq(optarg, "bin"))
{
format = FORMAT_BINARY;
}
continue;
default:
usage(stderr, argv[0]);
return 1;
}
break;
}
/* TODO: maybe make plugins configurable */
lib->plugins->load(lib->plugins, PLUGINS);
if (!chunk_from_fd(fd, &chunk))
{
fprintf(stderr, "reading input failed: %s\n", strerror(errno));
return 1;
}
cert = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
BUILD_BLOB, chunk, BUILD_END);
chunk_free(&chunk);
if (fd != 0)
{
close(fd);
}
if (!cert)
{
fprintf(stderr, "failed to read certificate\n");
return 1;
}
id = cert->get_subject(cert);
if (!id)
{
fprintf(stderr, "failed to get certificate's subject DN\n");
cert->destroy(cert);
return 1;
}
fmt = "%.*s\n";
switch (format)
{
case FORMAT_CONFIG:
fmt = "\"asn1dn:#%.*s\"\n";
/* fall-through */
case FORMAT_HEX:
chunk = chunk_to_hex(id->get_encoding(id), NULL, FALSE);
printf(fmt, (int)chunk.len, chunk.ptr);
chunk_free(&chunk);
break;
case FORMAT_BASE64:
chunk = chunk_to_base64(id->get_encoding(id), NULL);
printf(fmt, (int)chunk.len, chunk.ptr);
chunk_free(&chunk);
break;
case FORMAT_BINARY:
chunk = id->get_encoding(id);
if (fwrite(chunk.ptr, chunk.len, 1, stdout) != 1)
{
fprintf(stderr, "writing subject DN failed\n");
}
break;
}
cert->destroy(cert);
return 0;
}
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