2 * px5g - Embedded x509 key and certificate generator based on PolarSSL
4 * Copyright (C) 2009 Steven Barth <steven@midlink.org>
5 * Copyright (C) 2014 Felix Fietkau <nbd@nbd.name>
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License, version 2.1 as published by the Free Software Foundation.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
22 #include <sys/types.h>
34 #include <mbedtls/bignum.h>
35 #include <mbedtls/x509_crt.h>
36 #include <mbedtls/rsa.h>
37 #include <mbedtls/pk.h>
38 #define lib_wrapper(x) mbedtls_##x
39 #define MD_SHA256 MBEDTLS_MD_SHA256
41 #include <polarssl/bignum.h>
42 #include <polarssl/x509_crt.h>
43 #include <polarssl/rsa.h>
44 #define lib_wrapper(x) x
45 #define MD_SHA256 POLARSSL_MD_SHA256
48 #define PX5G_VERSION "0.2"
49 #define PX5G_COPY "Copyright (c) 2009 Steven Barth <steven@midlink.org>"
50 #define PX5G_LICENSE "Licensed under the GNU Lesser General Public License v2.1"
52 static int urandom_fd;
53 static char buf[16384];
55 static int _urandom(void *ctx, unsigned char *out, size_t len)
57 read(urandom_fd, out, len);
61 static void write_file(const char *path, int len, bool pem)
64 const char *buf_start = buf;
67 buf_start += sizeof(buf) - len;
70 fprintf(stderr, "No data to write\n");
75 fprintf(stderr, "error: I/O error\n");
82 fwrite(buf_start, 1, len, f);
86 static void write_key(lib_wrapper(pk_context) *key, const char *path, bool pem)
91 if (lib_wrapper(pk_write_key_pem(key, (void *) buf, sizeof(buf)) == 0))
94 len = lib_wrapper(pk_write_key_der(key, (void *) buf, sizeof(buf)));
99 write_file(path, len, pem);
102 static void gen_key(lib_wrapper(pk_context) *key, int ksize, int exp, bool pem)
104 lib_wrapper(pk_init(key));
105 fprintf(stderr, "Generating RSA private key, %i bit long modulus\n", ksize);
107 mbedtls_pk_setup(key, mbedtls_pk_info_from_type(MBEDTLS_PK_RSA));
108 if (mbedtls_rsa_gen_key(mbedtls_pk_rsa(*key), _urandom, NULL, ksize, exp)) {
110 pk_init_ctx(key, lib_wrapper(pk_info_from_type(POLARSSL_PK_RSA)));
111 if (rsa_gen_key(pk_rsa(*key), _urandom, NULL, ksize, exp)) {
113 fprintf(stderr, "error: key generation failed\n");
118 int rsakey(char **arg)
120 lib_wrapper(pk_context) key;
121 unsigned int ksize = 512;
126 while (*arg && **arg == '-') {
127 if (!strcmp(*arg, "-out") && arg[1]) {
130 } else if (!strcmp(*arg, "-3")) {
132 } else if (!strcmp(*arg, "-der")) {
139 ksize = (unsigned int)atoi(*arg);
141 gen_key(&key, ksize, exp, pem);
142 write_key(&key, path, pem);
144 lib_wrapper(pk_free(&key));
149 int selfsigned(char **arg)
151 lib_wrapper(pk_context) key;
152 lib_wrapper(x509write_cert) cert;
153 lib_wrapper(mpi) serial;
156 unsigned int ksize = 512;
158 unsigned int days = 30;
159 char *keypath = NULL, *certpath = NULL;
161 time_t from = time(NULL), to;
162 char fstr[20], tstr[20], sstr[17];
165 while (*arg && **arg == '-') {
166 if (!strcmp(*arg, "-der")) {
168 } else if (!strcmp(*arg, "-newkey") && arg[1]) {
169 if (strncmp(arg[1], "rsa:", 4)) {
170 fprintf(stderr, "error: invalid algorithm");
173 ksize = (unsigned int)atoi(arg[1] + 4);
175 } else if (!strcmp(*arg, "-days") && arg[1]) {
176 days = (unsigned int)atoi(arg[1]);
178 } else if (!strcmp(*arg, "-keyout") && arg[1]) {
181 } else if (!strcmp(*arg, "-out") && arg[1]) {
184 } else if (!strcmp(*arg, "-subj") && arg[1]) {
185 if (arg[1][0] != '/' || strchr(arg[1], ';')) {
186 fprintf(stderr, "error: invalid subject");
189 subject = calloc(strlen(arg[1]) + 1, 1);
190 char *oldc = arg[1] + 1, *newc = subject, *delim;
192 delim = strchr(oldc, '=');
194 fprintf(stderr, "error: invalid subject");
197 memcpy(newc, oldc, delim - oldc + 1);
198 newc += delim - oldc + 1;
201 delim = strchr(oldc, '/');
203 delim = arg[1] + strlen(arg[1]);
205 memcpy(newc, oldc, delim - oldc);
206 newc += delim - oldc;
215 gen_key(&key, ksize, exp, pem);
218 write_key(&key, keypath, pem);
220 from = (from < 1000000000) ? 1000000000 : from;
221 strftime(fstr, sizeof(fstr), "%Y%m%d%H%M%S", gmtime(&from));
222 to = from + 60 * 60 * 24 * days;
225 strftime(tstr, sizeof(tstr), "%Y%m%d%H%M%S", gmtime(&to));
227 fprintf(stderr, "Generating selfsigned certificate with subject '%s'"
228 " and validity %s-%s\n", subject, fstr, tstr);
230 lib_wrapper(x509write_crt_init(&cert));
231 lib_wrapper(x509write_crt_set_md_alg(&cert, MD_SHA256));
232 lib_wrapper(x509write_crt_set_issuer_key(&cert, &key));
233 lib_wrapper(x509write_crt_set_subject_key(&cert, &key));
234 lib_wrapper(x509write_crt_set_subject_name(&cert, subject));
235 lib_wrapper(x509write_crt_set_issuer_name(&cert, subject));
236 lib_wrapper(x509write_crt_set_validity(&cert, fstr, tstr));
237 lib_wrapper(x509write_crt_set_basic_constraints(&cert, 0, -1));
238 lib_wrapper(x509write_crt_set_subject_key_identifier(&cert));
239 lib_wrapper(x509write_crt_set_authority_key_identifier(&cert));
241 _urandom(NULL, buf, 8);
242 for (len = 0; len < 8; len++)
243 sprintf(sstr + len*2, "%02x", (unsigned char) buf[len]);
245 lib_wrapper(mpi_init(&serial));
246 lib_wrapper(mpi_read_string(&serial, 16, sstr));
247 lib_wrapper(x509write_crt_set_serial(&cert, &serial));
250 if (lib_wrapper(x509write_crt_pem(&cert, (void *) buf, sizeof(buf), _urandom, NULL) < 0)) {
251 fprintf(stderr, "Failed to generate certificate\n");
257 len = lib_wrapper(x509write_crt_der(&cert, (void *) buf, sizeof(buf), _urandom, NULL));
259 fprintf(stderr, "Failed to generate certificate: %d\n", len);
263 write_file(certpath, len, pem);
265 lib_wrapper(x509write_crt_free(&cert));
266 lib_wrapper(mpi_free(&serial));
267 lib_wrapper(pk_free(&key));
272 int main(int argc, char *argv[])
274 urandom_fd = open("/dev/urandom", O_RDONLY);
278 } else if (!strcmp(argv[1], "rsakey")) {
279 return rsakey(argv+2);
280 } else if (!strcmp(argv[1], "selfsigned")) {
281 return selfsigned(argv+2);
285 "PX5G X.509 Certificate Generator Utility v" PX5G_VERSION "\n" PX5G_COPY
286 "\nbased on PolarSSL by Christophe Devine and Paul Bakker\n\n");
287 fprintf(stderr, "Usage: %s [rsakey|selfsigned]\n", *argv);