package/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 "polarssl/havege.h"
  26 #include "polarssl/bignum.h"
  27 #include "polarssl/x509.h"
  28 #include "polarssl/rsa.h"
  29
  30 #define PX5G_VERSION "0.1"
  31 #define PX5G_COPY "Copyright (c) 2009 Steven Barth <steven@midlink.org>"
  32 #define PX5G_LICENSE "Licensed under the GNU Lesser General Public License v2.1"
  33
  34 int rsakey(char **arg) {
  35         havege_state hs;
  36         rsa_context rsa;
  37
  38         unsigned int ksize = 512;
  39         int exp = 65537;
  40         char *path = NULL;
  41         int flag = X509_OUTPUT_PEM;
  42
  43         while (*arg && **arg == '-') {
  44                 if (!strcmp(*arg, "-out") && arg[1]) {
  45                         path = arg[1];
  46                         arg++;
  47                 } else if (!strcmp(*arg, "-3")) {
  48                         exp = 3;
  49                 } else if (!strcmp(*arg, "-der")) {
  50                         flag = X509_OUTPUT_DER;
  51                 }
  52                 arg++;
  53         }
  54
  55         if (*arg) {
  56                 ksize = (unsigned int)atoi(*arg);
  57         }
  58
  59         havege_init(&hs);
  60         rsa_init(&rsa, RSA_PKCS_V15, 0, havege_rand, &hs);
  61
  62         fprintf(stderr, "Generating RSA private key, %i bit long modulus\n", ksize);
  63         if (rsa_gen_key(&rsa, ksize, exp)) {
  64                 fprintf(stderr, "error: key generation failed\n");
  65                 return 1;
  66         }
  67
  68         if (x509write_keyfile(&rsa, path, flag)) {
  69                 fprintf(stderr, "error: I/O error\n");
  70                 return 1;
  71         }
  72
  73         rsa_free(&rsa);
  74         return 0;
  75 }
  76
  77 int selfsigned(char **arg) {
  78         havege_state hs;
  79         rsa_context rsa;
  80         x509_node node;
  81
  82         char *subject = "";
  83         unsigned int ksize = 512;
  84         int exp = 65537;
  85         unsigned int days = 30;
  86         char *keypath = NULL, *certpath = NULL;
  87         int flag = X509_OUTPUT_PEM;
  88         time_t from = time(NULL), to;
  89         char fstr[20], tstr[20];
  90
  91         while (*arg && **arg == '-') {
  92                 if (!strcmp(*arg, "-der")) {
  93                         flag = X509_OUTPUT_DER;
  94                 } else if (!strcmp(*arg, "-newkey") && arg[1]) {
  95                         if (strncmp(arg[1], "rsa:", 4)) {
  96                                 fprintf(stderr, "error: invalid algorithm");
  97                                 return 1;
  98                         }
  99                         ksize = (unsigned int)atoi(arg[1] + 4);
 100                         arg++;
 101                 } else if (!strcmp(*arg, "-days") && arg[1]) {
 102                         days = (unsigned int)atoi(arg[1]);
 103                         arg++;
 104                 } else if (!strcmp(*arg, "-keyout") && arg[1]) {
 105                         keypath = arg[1];
 106                         arg++;
 107                 } else if (!strcmp(*arg, "-out") && arg[1]) {
 108                         certpath = arg[1];
 109                         arg++;
 110                 } else if (!strcmp(*arg, "-subj") && arg[1]) {
 111                         if (arg[1][0] != '/' || strchr(arg[1], ';')) {
 112                                 fprintf(stderr, "error: invalid subject");
 113                                 return 1;
 114                         }
 115                         subject = calloc(strlen(arg[1]) + 1, 1);
 116                         char *oldc = arg[1] + 1, *newc = subject, *delim;
 117                         do {
 118                                 delim = strchr(oldc, '=');
 119                                 if (!delim) {
 120                                         fprintf(stderr, "error: invalid subject");
 121                                         return 1;
 122                                 }
 123                                 memcpy(newc, oldc, delim - oldc + 1);
 124                                 newc += delim - oldc + 1;
 125                                 oldc = delim + 1;
 126
 127                                 delim = strchr(oldc, '/');
 128                                 if (!delim) {
 129                                         delim = arg[1] + strlen(arg[1]);
 130                                 }
 131                                 memcpy(newc, oldc, delim - oldc);
 132                                 newc += delim - oldc;
 133                                 *newc++ = ';';
 134                                 oldc = delim + 1;
 135                         } while(*delim);
 136                         arg++;
 137                 }
 138                 arg++;
 139         }
 140
 141         havege_init(&hs);
 142         rsa_init(&rsa, RSA_PKCS_V15, 0, havege_rand, &hs);
 143         x509write_init_node(&node);
 144         fprintf(stderr, "Generating RSA private key, %i bit long modulus\n", ksize);
 145         if (rsa_gen_key(&rsa, ksize, exp)) {
 146                 fprintf(stderr, "error: key generation failed\n");
 147                 return 1;
 148         }
 149
 150         if (keypath) {
 151                 if (x509write_keyfile(&rsa, keypath, flag)) {
 152                         fprintf(stderr, "error: I/O error\n");
 153                         return 1;
 154                 }
 155         }
 156
 157         from = (from < 1000000000) ? 1000000000 : from;
 158         strftime(fstr, sizeof(fstr), "%F %H:%M:%S", gmtime(&from));
 159         to = from + 60 * 60 * 24 * days;
 160         strftime(tstr, sizeof(tstr), "%F %H:%M:%S", gmtime(&to));
 161
 162         x509_raw cert;
 163         x509write_init_raw(&cert);
 164         x509write_add_pubkey(&cert, &rsa);
 165         x509write_add_subject(&cert, (unsigned char*)subject);
 166         x509write_add_validity(&cert, (unsigned char*)fstr, (unsigned char*)tstr);
 167         fprintf(stderr, "Generating selfsigned certificate with subject '%s'"
 168                         " and validity %s-%s\n", subject, fstr, tstr);
 169         if (x509write_create_selfsign(&cert, &rsa)) {
 170                 fprintf(stderr, "error: certificate generation failed\n");
 171         }
 172
 173         if (x509write_crtfile(&cert, (unsigned char*)certpath, flag)) {
 174                 fprintf(stderr, "error: I/O error\n");
 175                 return 1;
 176         }
 177
 178         x509write_free_raw(&cert);
 179         rsa_free(&rsa);
 180         return 0;
 181 }
 182
 183 int main(int argc, char *argv[]) {
 184         if (!argv[1]) {
 185                 //Usage
 186         } else if (!strcmp(argv[1], "rsakey")) {
 187                 return rsakey(argv+2);
 188         } else if (!strcmp(argv[1], "selfsigned")) {
 189                 return selfsigned(argv+2);
 190         }
 191
 192         fprintf(stderr,
 193                 "PX5G X.509 Certificate Generator Utility v" PX5G_VERSION "\n" PX5G_COPY
 194                 "\nbased on PolarSSL by Christophe Devine and Paul Bakker\n\n");
 195         fprintf(stderr, "Usage: %s [rsakey|selfsigned]\n", *argv);
 196         return 1;
 197 }