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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 "pki.h"
#include <credentials/certificates/certificate.h>
#include <errno.h>
/**
* Extract subject DN
*/
static int dn()
{
identification_t *id;
certificate_t *cert;
chunk_t chunk;
enum {
FORMAT_CONFIG,
FORMAT_HEX,
FORMAT_BASE64,
FORMAT_BINARY,
} format = FORMAT_CONFIG;
char *arg, *file = NULL, *fmt;
while (TRUE)
{
switch (command_getopt(&arg))
{
case 'h':
return command_usage(NULL);
case 'f':
if (streq(arg, "hex"))
{
format = FORMAT_HEX;
}
else if (streq(arg, "base64"))
{
format = FORMAT_BASE64;
}
else if (streq(arg, "bin"))
{
format = FORMAT_BINARY;
}
else if (!streq(arg, "config"))
{
return command_usage( "invalid output format");
}
continue;
case 'i':
file = arg;
continue;
case EOF:
break;
default:
return command_usage("invalid --print option");
}
break;
}
if (file)
{
cert = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
BUILD_FROM_FILE, file, BUILD_END);
}
else
{
chunk_t chunk;
set_file_mode(stdin, CERT_ASN1_DER);
if (!chunk_from_fd(0, &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);
free(chunk.ptr);
}
if (!cert)
{
fprintf(stderr, "parsing input failed\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;
}
/**
* Register the command.
*/
static void __attribute__ ((constructor))reg()
{
command_register((command_t)
{ dn, 'd', "dn",
"extract the subject DN of an X.509 certificate",
{"[--in file] [--format config|hex|base64|bin]"},
{
{"help", 'h', 0, "show usage information"},
{"in", 'i', 1, "input file, default: stdin"},
{"format", 'f', 1, "output format, default: config"},
}
});
}
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