source4/lib/tls/tlscert.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    auto-generate self signed TLS certificates
   5
   6    Copyright (C) Andrew Tridgell 2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "lib/util/util_file.h"
  24 #include "lib/tls/tls.h"
  25
  26 #include <gnutls/gnutls.h>
  27 #include <gnutls/x509.h>
  28
  29 #define ORGANISATION_NAME "Samba Administration"
  30 #define CA_NAME           "Samba - temporary autogenerated CA certificate"
  31 #define UNIT_NAME         "Samba - temporary autogenerated HOST certificate"
  32 #define LIFETIME          700*24*60*60
  33
  34 /* FIPS140-2 only allows 2048 or 3072 prime sizes. */
  35 #define RSA_BITS gnutls_fips140_mode_enabled() ? 3072 : 4096
  36
  37 /*
  38    auto-generate a set of self signed certificates
  39 */
  40 void tls_cert_generate(TALLOC_CTX *mem_ctx,
  41                        const char *hostname,
  42                        const char *keyfile, const char *certfile,
  43                        const char *cafile)
  44 {
  45         gnutls_x509_crt_t cacrt, crt;
  46         gnutls_x509_privkey_t key, cakey;
  47         uint32_t serial = (uint32_t)time(NULL);
  48         unsigned char keyid[100];
  49         char buf[4096];
  50         size_t bufsize;
  51         size_t keyidsize = sizeof(keyid);
  52         time_t activation = time(NULL), expiry = activation + LIFETIME;
  53         int ret;
  54
  55         if (file_exist(keyfile) || file_exist(certfile) || file_exist(cafile)) {
  56                 DEBUG(0,("TLS autogeneration skipped - some TLS files already exist\n"));
  57                 return;
  58         }
  59
  60 #define TLSCHECK(call) do { \
  61         ret = call; \
  62         if (ret < 0) { \
  63                 DEBUG(0,("TLS %s - %s\n", #call, gnutls_strerror(ret))); \
  64                 goto failed; \
  65         } \
  66 } while (0)
  67
  68         DEBUG(0,("Attempting to autogenerate TLS self-signed keys for https for hostname '%s'\n",
  69                  hostname));
  70
  71         DEBUG(3,("Generating private key\n"));
  72         TLSCHECK(gnutls_x509_privkey_init(&key));
  73         TLSCHECK(gnutls_x509_privkey_generate(key,   GNUTLS_PK_RSA, RSA_BITS, 0));
  74
  75         DEBUG(3,("Generating CA private key\n"));
  76         TLSCHECK(gnutls_x509_privkey_init(&cakey));
  77         TLSCHECK(gnutls_x509_privkey_generate(cakey, GNUTLS_PK_RSA, RSA_BITS, 0));
  78
  79         DEBUG(3,("Generating CA certificate\n"));
  80         TLSCHECK(gnutls_x509_crt_init(&cacrt));
  81         TLSCHECK(gnutls_x509_crt_set_dn_by_oid(cacrt,
  82                                       GNUTLS_OID_X520_ORGANIZATION_NAME, 0,
  83                                       ORGANISATION_NAME, strlen(ORGANISATION_NAME)));
  84         TLSCHECK(gnutls_x509_crt_set_dn_by_oid(cacrt,
  85                                       GNUTLS_OID_X520_ORGANIZATIONAL_UNIT_NAME, 0,
  86                                       CA_NAME, strlen(CA_NAME)));
  87         TLSCHECK(gnutls_x509_crt_set_dn_by_oid(cacrt,
  88                                       GNUTLS_OID_X520_COMMON_NAME, 0,
  89                                       hostname, strlen(hostname)));
  90         TLSCHECK(gnutls_x509_crt_set_key(cacrt, cakey));
  91         TLSCHECK(gnutls_x509_crt_set_serial(cacrt, &serial, sizeof(serial)));
  92         TLSCHECK(gnutls_x509_crt_set_activation_time(cacrt, activation));
  93         TLSCHECK(gnutls_x509_crt_set_expiration_time(cacrt, expiry));
  94         TLSCHECK(gnutls_x509_crt_set_ca_status(cacrt, 1));
  95         TLSCHECK(gnutls_x509_crt_set_key_usage(cacrt, GNUTLS_KEY_KEY_CERT_SIGN | GNUTLS_KEY_CRL_SIGN));
  96         TLSCHECK(gnutls_x509_crt_set_version(cacrt, 3));
  97         TLSCHECK(gnutls_x509_crt_get_key_id(cacrt, 0, keyid, &keyidsize));
  98         TLSCHECK(gnutls_x509_crt_set_subject_key_id(cacrt, keyid, keyidsize));
  99         TLSCHECK(gnutls_x509_crt_sign2(cacrt, cacrt, cakey,
 100                                        GNUTLS_DIG_SHA256, 0));
 101
 102         DEBUG(3,("Generating TLS certificate\n"));
 103         TLSCHECK(gnutls_x509_crt_init(&crt));
 104         TLSCHECK(gnutls_x509_crt_set_dn_by_oid(crt,
 105                                       GNUTLS_OID_X520_ORGANIZATION_NAME, 0,
 106                                       ORGANISATION_NAME, strlen(ORGANISATION_NAME)));
 107         TLSCHECK(gnutls_x509_crt_set_dn_by_oid(crt,
 108                                       GNUTLS_OID_X520_ORGANIZATIONAL_UNIT_NAME, 0,
 109                                       UNIT_NAME, strlen(UNIT_NAME)));
 110         TLSCHECK(gnutls_x509_crt_set_dn_by_oid(crt,
 111                                       GNUTLS_OID_X520_COMMON_NAME, 0,
 112                                       hostname, strlen(hostname)));
 113         TLSCHECK(gnutls_x509_crt_set_key(crt, key));
 114         TLSCHECK(gnutls_x509_crt_set_serial(crt, &serial, sizeof(serial)));
 115         TLSCHECK(gnutls_x509_crt_set_activation_time(crt, activation));
 116         TLSCHECK(gnutls_x509_crt_set_expiration_time(crt, expiry));
 117         TLSCHECK(gnutls_x509_crt_set_ca_status(crt, 0));
 118         TLSCHECK(gnutls_x509_crt_set_key_purpose_oid(crt, GNUTLS_KP_TLS_WWW_SERVER, 0));
 119         TLSCHECK(gnutls_x509_crt_set_version(crt, 3));
 120         TLSCHECK(gnutls_x509_crt_get_key_id(crt, 0, keyid, &keyidsize));
 121         TLSCHECK(gnutls_x509_crt_set_subject_key_id(crt, keyid, keyidsize));
 122         TLSCHECK(gnutls_x509_crt_sign2(crt, crt, key,
 123                                        GNUTLS_DIG_SHA256, 0));
 124         TLSCHECK(gnutls_x509_crt_sign2(crt, cacrt, cakey,
 125                                        GNUTLS_DIG_SHA256, 0));
 126
 127         DEBUG(3,("Exporting TLS keys\n"));
 128
 129         bufsize = sizeof(buf);
 130         TLSCHECK(gnutls_x509_crt_export(crt, GNUTLS_X509_FMT_PEM, buf, &bufsize));
 131         if (!file_save(certfile, buf, bufsize)) {
 132                 DEBUG(0,("Unable to save certificate in %s parent dir exists ?\n", certfile));
 133                 goto failed;
 134         }
 135
 136         bufsize = sizeof(buf);
 137         TLSCHECK(gnutls_x509_crt_export(cacrt, GNUTLS_X509_FMT_PEM, buf, &bufsize));
 138         if (!file_save(cafile, buf, bufsize)) {
 139                 DEBUG(0,("Unable to save ca cert in %s parent dir exists ?\n", cafile));
 140                 goto failed;
 141         }
 142
 143         bufsize = sizeof(buf);
 144         TLSCHECK(gnutls_x509_privkey_export(key, GNUTLS_X509_FMT_PEM, buf, &bufsize));
 145         if (!file_save_mode(keyfile, buf, bufsize, 0600)) {
 146                 DEBUG(0,("Unable to save privatekey in %s parent dir exists ?\n", keyfile));
 147                 goto failed;
 148         }
 149
 150         gnutls_x509_privkey_deinit(key);
 151         gnutls_x509_privkey_deinit(cakey);
 152         gnutls_x509_crt_deinit(cacrt);
 153         gnutls_x509_crt_deinit(crt);
 154
 155         DEBUG(0,("TLS self-signed keys generated OK\n"));
 156         return;
 157
 158 failed:
 159         DEBUG(0,("TLS certificate generation failed\n"));
 160 }