src/pki/commands/self.c

   1 /*
   2  * Copyright (C) 2009 Martin Willi
   3  * Hochschule fuer Technik Rapperswil
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * for more details.
  14  */
  15
  16 #include <time.h>
  17
  18 #include "pki.h"
  19
  20 #include <utils/linked_list.h>
  21 #include <utils/optionsfrom.h>
  22 #include <credentials/certificates/certificate.h>
  23 #include <credentials/certificates/x509.h>
  24
  25 /**
  26  * Create a self signed certificate.
  27  */
  28 static int self(int argc, char *argv[])
  29 {
  30         key_type_t type = KEY_RSA;
  31         hash_algorithm_t digest = HASH_SHA1;
  32         certificate_t *cert = NULL;
  33         private_key_t *private = NULL;
  34         public_key_t *public = NULL;
  35         char *file = NULL, *dn = NULL, *hex = NULL, *error = NULL;
  36         identification_t *id = NULL;
  37         linked_list_t *san;
  38         int lifetime = 1080;
  39         chunk_t serial = chunk_empty;
  40         chunk_t encoding = chunk_empty;
  41         time_t not_before, not_after;
  42         x509_flag_t flags = 0;
  43         options_t *options;
  44
  45         options = options_create();
  46         san = linked_list_create();
  47
  48         while (TRUE)
  49         {
  50                 switch (getopt_long(argc, argv, "", command_opts, NULL))
  51                 {
  52                         case 'h':
  53                                 goto usage;
  54                         case '+':
  55                                 if (!options->from(options, optarg, &argc, &argv, optind))
  56                                 {
  57                                         error = "invalid options file";
  58                                         goto usage;
  59                                 }
  60                                 continue;
  61                         case 't':
  62                                 if (streq(optarg, "rsa"))
  63                                 {
  64                                         type = KEY_RSA;
  65                                 }
  66                                 else if (streq(optarg, "ecdsa"))
  67                                 {
  68                                         type = KEY_ECDSA;
  69                                 }
  70                                 else
  71                                 {
  72                                         error = "invalid input type";
  73                                         goto usage;
  74                                 }
  75                                 continue;
  76                         case 'g':
  77                                 digest = get_digest(optarg);
  78                                 if (digest == HASH_UNKNOWN)
  79                                 {
  80                                         error = "invalid --digest type";
  81                                         goto usage;
  82                                 }
  83                                 continue;
  84                         case 'i':
  85                                 file = optarg;
  86                                 continue;
  87                         case 'd':
  88                                 dn = optarg;
  89                                 continue;
  90                         case 'a':
  91                                 san->insert_last(san, identification_create_from_string(optarg));
  92                                 continue;
  93                         case 'l':
  94                                 lifetime = atoi(optarg);
  95                                 if (!lifetime)
  96                                 {
  97                                         error = "invalid --lifetime value";
  98                                         goto usage;
  99                                 }
 100                                 continue;
 101                         case 's':
 102                                 hex = optarg;
 103                                 continue;
 104                         case 'c':
 105                                 flags |= X509_CA;
 106                                 continue;
 107                         case EOF:
 108                                 break;
 109                         default:
 110                                 error = "invalid --self option";
 111                                 goto usage;
 112                 }
 113                 break;
 114         }
 115
 116         if (!dn)
 117         {
 118                 error = "--dn is required";
 119                 goto usage;
 120         }
 121         id = identification_create_from_string(dn);
 122         if (id->get_type(id) != ID_DER_ASN1_DN)
 123         {
 124                 error = "supplied --dn is not a distinguished name";
 125                 goto end;
 126         }
 127         if (file)
 128         {
 129                 private = lib->creds->create(lib->creds, CRED_PRIVATE_KEY, type,
 130                                                                          BUILD_FROM_FILE, file, BUILD_END);
 131         }
 132         else
 133         {
 134                 private = lib->creds->create(lib->creds, CRED_PRIVATE_KEY, type,
 135                                                                          BUILD_FROM_FD, 0, BUILD_END);
 136         }
 137         if (!private)
 138         {
 139                 error = "parsing private key failed";
 140                 goto end;
 141         }
 142         public = private->get_public_key(private);
 143         if (!public)
 144         {
 145                 error = "extracting public key failed";
 146                 goto end;
 147         }
 148         if (hex)
 149         {
 150                 serial = chunk_from_hex(chunk_create(hex, strlen(hex)), NULL);
 151         }
 152         else
 153         {
 154                 rng_t *rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
 155
 156                 if (!rng)
 157                 {
 158                         error = "no random number generator found";
 159                         goto end;
 160                 }
 161                 rng->allocate_bytes(rng, 8, &serial);
 162                 rng->destroy(rng);
 163         }
 164         not_before = time(NULL);
 165         not_after = not_before + lifetime * 24 * 60 * 60;
 166         cert = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
 167                                                 BUILD_SIGNING_KEY, private, BUILD_PUBLIC_KEY, public,
 168                                                 BUILD_SUBJECT, id, BUILD_NOT_BEFORE_TIME, not_before,
 169                                                 BUILD_NOT_AFTER_TIME, not_after, BUILD_SERIAL, serial,
 170                                                 BUILD_DIGEST_ALG, digest, BUILD_X509_FLAG, flags,
 171                                                 BUILD_SUBJECT_ALTNAMES, san, BUILD_END);
 172         if (!cert)
 173         {
 174                 error = "generating certificate failed";
 175                 goto end;
 176         }
 177         encoding = cert->get_encoding(cert);
 178         if (!encoding.ptr)
 179         {
 180                 error = "encoding certificate failed";
 181                 goto end;
 182         }
 183         if (fwrite(encoding.ptr, encoding.len, 1, stdout) != 1)
 184         {
 185                 error = "writing certificate key failed";
 186                 goto end;
 187         }
 188
 189 end:
 190         DESTROY_IF(id);
 191         DESTROY_IF(cert);
 192         DESTROY_IF(public);
 193         DESTROY_IF(private);
 194         san->destroy_offset(san, offsetof(identification_t, destroy));
 195         options->destroy(options);
 196         free(encoding.ptr);
 197         free(serial.ptr);
 198
 199         if (error)
 200         {
 201                 fprintf(stderr, "%s\n", error);
 202                 return 1;
 203         }
 204         return 0;
 205
 206 usage:
 207         san->destroy_offset(san, offsetof(identification_t, destroy));
 208         options->destroy(options);
 209         return command_usage(CMD_SELF, error);
 210 }
 211
 212 /**
 213  * Register the command.
 214  */
 215 static void __attribute__ ((constructor))reg()
 216 {
 217         command_register(CMD_SELF, (command_t) {
 218                 self, 's', "self",
 219                 "create a self signed certificate",
 220                 {"[--in file] [--type rsa|ecdsa]",
 221                  " --dn distinguished-name [--san subjectAltName]+",
 222                  "[--lifetime days] [--serial hex] [--ca]",
 223                  "[--digest md5|sha1|sha224|sha256|sha384|sha512]",
 224                  "[--options file]"},
 225                 {
 226                         {"help",        'h', 0, "show usage information"},
 227                         {"in",          'i', 1, "private key input file, default: stdin"},
 228                         {"type",        't', 1, "type of input key, default: rsa"},
 229                         {"dn",          'd', 1, "subject and issuer distinguished name"},
 230                         {"san",         'a', 1, "subjectAltName to include in certificate"},
 231                         {"lifetime",'l', 1, "days the certificate is valid, default: 1080"},
 232                         {"serial",      's', 1, "serial number in hex, default: random"},
 233                         {"ca",          'b', 0, "include CA basicConstraint, default: no"},
 234                         {"digest",      'g', 1, "digest for signature creation, default: sha1"},
 235                         {"options",     '+', 1, "read command line options from file"},
 236                 }
 237         });
 238 }