package/utils/px5g/src/px5g.c

   1 /*
   2  * px5g - Embedded x509 key and certificate generator based on PolarSSL
   3  *
   4  *   Copyright (C) 2009 Steven Barth <steven@midlink.org>
   5  *
   6  *  This library is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU Lesser General Public
   8  *  License, version 2.1 as published by the Free Software Foundation.
   9  *
  10  *  This library is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *  Lesser General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Lesser General Public
  16  *  License along with this library; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  18  *  MA  02110-1301  USA
  19  */
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <time.h>
  25 #include <limits.h>
  26 #include "polarssl/havege.h"
  27 #include "polarssl/bignum.h"
  28 #include "polarssl/x509.h"
  29 #include "polarssl/rsa.h"
  30
  31 #define PX5G_VERSION "0.1"
  32 #define PX5G_COPY "Copyright (c) 2009 Steven Barth <steven@midlink.org>"
  33 #define PX5G_LICENSE "Licensed under the GNU Lesser General Public License v2.1"
  34
  35 int rsakey(char **arg) {
  36         havege_state hs;
  37         rsa_context rsa;
  38
  39         unsigned int ksize = 512;
  40         int exp = 65537;
  41         char *path = NULL;
  42         int flag = X509_OUTPUT_PEM;
  43
  44         while (*arg && **arg == '-') {
  45                 if (!strcmp(*arg, "-out") && arg[1]) {
  46                         path = arg[1];
  47                         arg++;
  48                 } else if (!strcmp(*arg, "-3")) {
  49                         exp = 3;
  50                 } else if (!strcmp(*arg, "-der")) {
  51                         flag = X509_OUTPUT_DER;
  52                 }
  53                 arg++;
  54         }
  55
  56         if (*arg) {
  57                 ksize = (unsigned int)atoi(*arg);
  58         }
  59
  60         havege_init(&hs);
  61         rsa_init(&rsa, RSA_PKCS_V15, 0, havege_rand, &hs);
  62
  63         fprintf(stderr, "Generating RSA private key, %i bit long modulus\n", ksize);
  64         if (rsa_gen_key(&rsa, ksize, exp)) {
  65                 fprintf(stderr, "error: key generation failed\n");
  66                 return 1;
  67         }
  68
  69         if (x509write_keyfile(&rsa, path, flag)) {
  70                 fprintf(stderr, "error: I/O error\n");
  71                 return 1;
  72         }
  73
  74         rsa_free(&rsa);
  75         return 0;
  76 }
  77
  78 int selfsigned(char **arg) {
  79         havege_state hs;
  80         rsa_context rsa;
  81         x509_node node;
  82
  83         char *subject = "";
  84         unsigned int ksize = 512;
  85         int exp = 65537;
  86         unsigned int days = 30;
  87         char *keypath = NULL, *certpath = NULL;
  88         int flag = X509_OUTPUT_PEM;
  89         time_t from = time(NULL), to;
  90         char fstr[20], tstr[20];
  91
  92         while (*arg && **arg == '-') {
  93                 if (!strcmp(*arg, "-der")) {
  94                         flag = X509_OUTPUT_DER;
  95                 } else if (!strcmp(*arg, "-newkey") && arg[1]) {
  96                         if (strncmp(arg[1], "rsa:", 4)) {
  97                                 fprintf(stderr, "error: invalid algorithm");
  98                                 return 1;
  99                         }
 100                         ksize = (unsigned int)atoi(arg[1] + 4);
 101                         arg++;
 102                 } else if (!strcmp(*arg, "-days") && arg[1]) {
 103                         days = (unsigned int)atoi(arg[1]);
 104                         arg++;
 105                 } else if (!strcmp(*arg, "-keyout") && arg[1]) {
 106                         keypath = arg[1];
 107                         arg++;
 108                 } else if (!strcmp(*arg, "-out") && arg[1]) {
 109                         certpath = arg[1];
 110                         arg++;
 111                 } else if (!strcmp(*arg, "-subj") && arg[1]) {
 112                         if (arg[1][0] != '/' || strchr(arg[1], ';')) {
 113                                 fprintf(stderr, "error: invalid subject");
 114                                 return 1;
 115                         }
 116                         subject = calloc(strlen(arg[1]) + 1, 1);
 117                         char *oldc = arg[1] + 1, *newc = subject, *delim;
 118                         do {
 119                                 delim = strchr(oldc, '=');
 120                                 if (!delim) {
 121                                         fprintf(stderr, "error: invalid subject");
 122                                         return 1;
 123                                 }
 124                                 memcpy(newc, oldc, delim - oldc + 1);
 125                                 newc += delim - oldc + 1;
 126                                 oldc = delim + 1;
 127
 128                                 delim = strchr(oldc, '/');
 129                                 if (!delim) {
 130                                         delim = arg[1] + strlen(arg[1]);
 131                                 }
 132                                 memcpy(newc, oldc, delim - oldc);
 133                                 newc += delim - oldc;
 134                                 *newc++ = ';';
 135                                 oldc = delim + 1;
 136                         } while(*delim);
 137                         arg++;
 138                 }
 139                 arg++;
 140         }
 141
 142         havege_init(&hs);
 143         rsa_init(&rsa, RSA_PKCS_V15, 0, havege_rand, &hs);
 144         x509write_init_node(&node);
 145         fprintf(stderr, "Generating RSA private key, %i bit long modulus\n", ksize);
 146         if (rsa_gen_key(&rsa, ksize, exp)) {
 147                 fprintf(stderr, "error: key generation failed\n");
 148                 return 1;
 149         }
 150
 151         if (keypath) {
 152                 if (x509write_keyfile(&rsa, keypath, flag)) {
 153                         fprintf(stderr, "error: I/O error\n");
 154                         return 1;
 155                 }
 156         }
 157
 158         from = (from < 1000000000) ? 1000000000 : from;
 159         strftime(fstr, sizeof(fstr), "%F %H:%M:%S", gmtime(&from));
 160         to = from + 60 * 60 * 24 * days;
 161         if (to < from)
 162                 to = INT_MAX;
 163         strftime(tstr, sizeof(tstr), "%F %H:%M:%S", gmtime(&to));
 164
 165         x509_raw cert;
 166         x509write_init_raw(&cert);
 167         x509write_add_pubkey(&cert, &rsa);
 168         x509write_add_subject(&cert, (unsigned char*)subject);
 169         x509write_add_validity(&cert, (unsigned char*)fstr, (unsigned char*)tstr);
 170         fprintf(stderr, "Generating selfsigned certificate with subject '%s'"
 171                         " and validity %s-%s\n", subject, fstr, tstr);
 172         if (x509write_create_selfsign(&cert, &rsa)) {
 173                 fprintf(stderr, "error: certificate generation failed\n");
 174         }
 175
 176         if (x509write_crtfile(&cert, (unsigned char*)certpath, flag)) {
 177                 fprintf(stderr, "error: I/O error\n");
 178                 return 1;
 179         }
 180
 181         x509write_free_raw(&cert);
 182         rsa_free(&rsa);
 183         return 0;
 184 }
 185
 186 int main(int argc, char *argv[]) {
 187         if (!argv[1]) {
 188                 //Usage
 189         } else if (!strcmp(argv[1], "rsakey")) {
 190                 return rsakey(argv+2);
 191         } else if (!strcmp(argv[1], "selfsigned")) {
 192                 return selfsigned(argv+2);
 193         }
 194
 195         fprintf(stderr,
 196                 "PX5G X.509 Certificate Generator Utility v" PX5G_VERSION "\n" PX5G_COPY
 197                 "\nbased on PolarSSL by Christophe Devine and Paul Bakker\n\n");
 198         fprintf(stderr, "Usage: %s [rsakey|selfsigned]\n", *argv);
 199         return 1;
 200 }