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/*
* px5g - Embedded x509 key and certificate generator based on PolarSSL
*
* Copyright (C) 2009 Steven Barth <steven@midlink.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License, version 2.1 as published by the Free Software Foundation.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <limits.h>
#include <fcntl.h>
#include <unistd.h>
#include "polarssl/bignum.h"
#include "polarssl/x509.h"
#include "polarssl/rsa.h"
#define PX5G_VERSION "0.1"
#define PX5G_COPY "Copyright (c) 2009 Steven Barth <steven@midlink.org>"
#define PX5G_LICENSE "Licensed under the GNU Lesser General Public License v2.1"
static int urandom_fd;
static int _urandom(void *ctx)
{
int ret;
read(urandom_fd, &ret, sizeof(ret));
return ret;
}
int rsakey(char **arg) {
rsa_context rsa;
unsigned int ksize = 512;
int exp = 65537;
char *path = NULL;
int flag = X509_OUTPUT_PEM;
while (*arg && **arg == '-') {
if (!strcmp(*arg, "-out") && arg[1]) {
path = arg[1];
arg++;
} else if (!strcmp(*arg, "-3")) {
exp = 3;
} else if (!strcmp(*arg, "-der")) {
flag = X509_OUTPUT_DER;
}
arg++;
}
if (*arg) {
ksize = (unsigned int)atoi(*arg);
}
rsa_init(&rsa, RSA_PKCS_V15, 0, _urandom, NULL);
fprintf(stderr, "Generating RSA private key, %i bit long modulus\n", ksize);
if (rsa_gen_key(&rsa, ksize, exp)) {
fprintf(stderr, "error: key generation failed\n");
return 1;
}
if (x509write_keyfile(&rsa, path, flag)) {
fprintf(stderr, "error: I/O error\n");
return 1;
}
rsa_free(&rsa);
return 0;
}
int selfsigned(char **arg) {
rsa_context rsa;
x509_node node;
char *subject = "";
unsigned int ksize = 512;
int exp = 65537;
unsigned int days = 30;
char *keypath = NULL, *certpath = NULL;
int flag = X509_OUTPUT_PEM;
time_t from = time(NULL), to;
char fstr[20], tstr[20];
while (*arg && **arg == '-') {
if (!strcmp(*arg, "-der")) {
flag = X509_OUTPUT_DER;
} else if (!strcmp(*arg, "-newkey") && arg[1]) {
if (strncmp(arg[1], "rsa:", 4)) {
fprintf(stderr, "error: invalid algorithm");
return 1;
}
ksize = (unsigned int)atoi(arg[1] + 4);
arg++;
} else if (!strcmp(*arg, "-days") && arg[1]) {
days = (unsigned int)atoi(arg[1]);
arg++;
} else if (!strcmp(*arg, "-keyout") && arg[1]) {
keypath = arg[1];
arg++;
} else if (!strcmp(*arg, "-out") && arg[1]) {
certpath = arg[1];
arg++;
} else if (!strcmp(*arg, "-subj") && arg[1]) {
if (arg[1][0] != '/' || strchr(arg[1], ';')) {
fprintf(stderr, "error: invalid subject");
return 1;
}
subject = calloc(strlen(arg[1]) + 1, 1);
char *oldc = arg[1] + 1, *newc = subject, *delim;
do {
delim = strchr(oldc, '=');
if (!delim) {
fprintf(stderr, "error: invalid subject");
return 1;
}
memcpy(newc, oldc, delim - oldc + 1);
newc += delim - oldc + 1;
oldc = delim + 1;
delim = strchr(oldc, '/');
if (!delim) {
delim = arg[1] + strlen(arg[1]);
}
memcpy(newc, oldc, delim - oldc);
newc += delim - oldc;
*newc++ = ';';
oldc = delim + 1;
} while(*delim);
arg++;
}
arg++;
}
rsa_init(&rsa, RSA_PKCS_V15, 0, _urandom, NULL);
x509write_init_node(&node);
fprintf(stderr, "Generating RSA private key, %i bit long modulus\n", ksize);
if (rsa_gen_key(&rsa, ksize, exp)) {
fprintf(stderr, "error: key generation failed\n");
return 1;
}
if (keypath) {
if (x509write_keyfile(&rsa, keypath, flag)) {
fprintf(stderr, "error: I/O error\n");
return 1;
}
}
from = (from < 1000000000) ? 1000000000 : from;
strftime(fstr, sizeof(fstr), "%F %H:%M:%S", gmtime(&from));
to = from + 60 * 60 * 24 * days;
if (to < from)
to = INT_MAX;
strftime(tstr, sizeof(tstr), "%F %H:%M:%S", gmtime(&to));
x509_raw cert;
x509write_init_raw(&cert);
x509write_add_pubkey(&cert, &rsa);
x509write_add_subject(&cert, (unsigned char*)subject);
x509write_add_validity(&cert, (unsigned char*)fstr, (unsigned char*)tstr);
fprintf(stderr, "Generating selfsigned certificate with subject '%s'"
" and validity %s-%s\n", subject, fstr, tstr);
if (x509write_create_selfsign(&cert, &rsa)) {
fprintf(stderr, "error: certificate generation failed\n");
}
if (x509write_crtfile(&cert, (unsigned char*)certpath, flag)) {
fprintf(stderr, "error: I/O error\n");
return 1;
}
x509write_free_raw(&cert);
rsa_free(&rsa);
return 0;
}
int main(int argc, char *argv[]) {
urandom_fd = open("/dev/urandom", O_RDONLY);
if (urandom_fd < 0) {
perror("open(/dev/urandom)");
return 1;
}
if (!argv[1]) {
//Usage
} else if (!strcmp(argv[1], "rsakey")) {
return rsakey(argv+2);
} else if (!strcmp(argv[1], "selfsigned")) {
return selfsigned(argv+2);
}
fprintf(stderr,
"PX5G X.509 Certificate Generator Utility v" PX5G_VERSION "\n" PX5G_COPY
"\nbased on PolarSSL by Christophe Devine and Paul Bakker\n\n");
fprintf(stderr, "Usage: %s [rsakey|selfsigned]\n", *argv);
return 1;
}
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