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/tls/tls.h"
  24
  25 #if ENABLE_GNUTLS
  26 #include <gnutls/gnutls.h>
  27 #include <gnutls/x509.h>
  28 #if defined(HAVE_GCRYPT_H) && !defined(HAVE_GNUTLS3)
  29 #include <gcrypt.h>
  30 #endif
  31
  32 #define ORGANISATION_NAME "Samba Administration"
  33 #define UNIT_NAME         "Samba - temporary autogenerated certificate"
  34 #define LIFETIME          700*24*60*60
  35 #define DH_BITS                   1024
  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 cacrt, crt;
  46         gnutls_x509_privkey 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         TLSCHECK(gnutls_global_init());
  69
  70         DEBUG(0,("Attempting to autogenerate TLS self-signed keys for https for hostname '%s'\n",
  71                  hostname));
  72
  73 #if defined(HAVE_GCRYPT_H) && !defined(HAVE_GNUTLS3)
  74         DEBUG(3,("Enabling QUICK mode in gcrypt\n"));
  75         gcry_control(GCRYCTL_ENABLE_QUICK_RANDOM, 0);
  76 #endif
  77
  78         DEBUG(3,("Generating private key\n"));
  79         TLSCHECK(gnutls_x509_privkey_init(&key));
  80         TLSCHECK(gnutls_x509_privkey_generate(key,   GNUTLS_PK_RSA, DH_BITS, 0));
  81
  82         DEBUG(3,("Generating CA private key\n"));
  83         TLSCHECK(gnutls_x509_privkey_init(&cakey));
  84         TLSCHECK(gnutls_x509_privkey_generate(cakey, GNUTLS_PK_RSA, DH_BITS, 0));
  85
  86         DEBUG(3,("Generating CA certificate\n"));
  87         TLSCHECK(gnutls_x509_crt_init(&cacrt));
  88         TLSCHECK(gnutls_x509_crt_set_dn_by_oid(cacrt,
  89                                       GNUTLS_OID_X520_ORGANIZATION_NAME, 0,
  90                                       ORGANISATION_NAME, strlen(ORGANISATION_NAME)));
  91         TLSCHECK(gnutls_x509_crt_set_dn_by_oid(cacrt,
  92                                       GNUTLS_OID_X520_ORGANIZATIONAL_UNIT_NAME, 0,
  93                                       UNIT_NAME, strlen(UNIT_NAME)));
  94         TLSCHECK(gnutls_x509_crt_set_dn_by_oid(cacrt,
  95                                       GNUTLS_OID_X520_COMMON_NAME, 0,
  96                                       hostname, strlen(hostname)));
  97         TLSCHECK(gnutls_x509_crt_set_key(cacrt, cakey));
  98         TLSCHECK(gnutls_x509_crt_set_serial(cacrt, &serial, sizeof(serial)));
  99         TLSCHECK(gnutls_x509_crt_set_activation_time(cacrt, activation));
 100         TLSCHECK(gnutls_x509_crt_set_expiration_time(cacrt, expiry));
 101         TLSCHECK(gnutls_x509_crt_set_ca_status(cacrt, 0));
 102 #ifdef GNUTLS_KP_TLS_WWW_SERVER
 103         TLSCHECK(gnutls_x509_crt_set_key_purpose_oid(cacrt, GNUTLS_KP_TLS_WWW_SERVER, 0));
 104 #endif
 105         TLSCHECK(gnutls_x509_crt_set_version(cacrt, 3));
 106         TLSCHECK(gnutls_x509_crt_get_key_id(cacrt, 0, keyid, &keyidsize));
 107 #if HAVE_GNUTLS_X509_CRT_SET_SUBJECT_KEY_ID
 108         TLSCHECK(gnutls_x509_crt_set_subject_key_id(cacrt, keyid, keyidsize));
 109 #endif
 110         TLSCHECK(gnutls_x509_crt_sign(cacrt, cacrt, cakey));
 111
 112         DEBUG(3,("Generating TLS certificate\n"));
 113         TLSCHECK(gnutls_x509_crt_init(&crt));
 114         TLSCHECK(gnutls_x509_crt_set_dn_by_oid(crt,
 115                                       GNUTLS_OID_X520_ORGANIZATION_NAME, 0,
 116                                       ORGANISATION_NAME, strlen(ORGANISATION_NAME)));
 117         TLSCHECK(gnutls_x509_crt_set_dn_by_oid(crt,
 118                                       GNUTLS_OID_X520_ORGANIZATIONAL_UNIT_NAME, 0,
 119                                       UNIT_NAME, strlen(UNIT_NAME)));
 120         TLSCHECK(gnutls_x509_crt_set_dn_by_oid(crt,
 121                                       GNUTLS_OID_X520_COMMON_NAME, 0,
 122                                       hostname, strlen(hostname)));
 123         TLSCHECK(gnutls_x509_crt_set_key(crt, key));
 124         TLSCHECK(gnutls_x509_crt_set_serial(crt, &serial, sizeof(serial)));
 125         TLSCHECK(gnutls_x509_crt_set_activation_time(crt, activation));
 126         TLSCHECK(gnutls_x509_crt_set_expiration_time(crt, expiry));
 127         TLSCHECK(gnutls_x509_crt_set_ca_status(crt, 0));
 128 #ifdef GNUTLS_KP_TLS_WWW_SERVER
 129         TLSCHECK(gnutls_x509_crt_set_key_purpose_oid(crt, GNUTLS_KP_TLS_WWW_SERVER, 0));
 130 #endif
 131         TLSCHECK(gnutls_x509_crt_set_version(crt, 3));
 132         TLSCHECK(gnutls_x509_crt_get_key_id(crt, 0, keyid, &keyidsize));
 133 #if HAVE_GNUTLS_X509_CRT_SET_SUBJECT_KEY_ID
 134         TLSCHECK(gnutls_x509_crt_set_subject_key_id(crt, keyid, keyidsize));
 135 #endif
 136         TLSCHECK(gnutls_x509_crt_sign(crt, crt, key));
 137
 138         DEBUG(3,("Exporting TLS keys\n"));
 139
 140         bufsize = sizeof(buf);
 141         TLSCHECK(gnutls_x509_crt_export(crt, GNUTLS_X509_FMT_PEM, buf, &bufsize));
 142         if (!file_save(certfile, buf, bufsize)) {
 143                 DEBUG(0,("Unable to save certificate in %s parent dir exists ?\n", certfile));
 144                 goto failed;
 145         }
 146
 147         bufsize = sizeof(buf);
 148         TLSCHECK(gnutls_x509_crt_export(cacrt, GNUTLS_X509_FMT_PEM, buf, &bufsize));
 149         if (!file_save(cafile, buf, bufsize)) {
 150                 DEBUG(0,("Unable to save ca cert in %s parent dir exists ?\n", cafile));
 151                 goto failed;
 152         }
 153
 154         bufsize = sizeof(buf);
 155         TLSCHECK(gnutls_x509_privkey_export(key, GNUTLS_X509_FMT_PEM, buf, &bufsize));
 156         if (!file_save_mode(keyfile, buf, bufsize, 0600)) {
 157                 DEBUG(0,("Unable to save privatekey in %s parent dir exists ?\n", keyfile));
 158                 goto failed;
 159         }
 160
 161         gnutls_x509_privkey_deinit(key);
 162         gnutls_x509_privkey_deinit(cakey);
 163         gnutls_x509_crt_deinit(cacrt);
 164         gnutls_x509_crt_deinit(crt);
 165         gnutls_global_deinit();
 166
 167         DEBUG(0,("TLS self-signed keys generated OK\n"));
 168         return;
 169
 170 failed:
 171         DEBUG(0,("TLS certificate generation failed\n"));
 172 }
 173
 174 #else
 175 void tls_cert_dummy(void) {}
 176 #endif