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 #include <gnutls/gnutls.h>
  26 #include <gnutls/x509.h>
  27
  28 #define ORGANISATION_NAME "Samba Administration"
  29 #define CA_NAME           "Samba - temporary autogenerated CA certificate"
  30 #define UNIT_NAME         "Samba - temporary autogenerated HOST certificate"
  31 #define LIFETIME          700*24*60*60
  32 #define RSA_BITS          4096
  33
  34 /*
  35    auto-generate a set of self signed certificates
  36 */
  37 void tls_cert_generate(TALLOC_CTX *mem_ctx,
  38                        const char *hostname,
  39                        const char *keyfile, const char *certfile,
  40                        const char *cafile)
  41 {
  42         gnutls_x509_crt cacrt, crt;
  43         gnutls_x509_privkey key, cakey;
  44         uint32_t serial = (uint32_t)time(NULL);
  45         unsigned char keyid[100];
  46         char buf[4096];
  47         size_t bufsize;
  48         size_t keyidsize = sizeof(keyid);
  49         time_t activation = time(NULL), expiry = activation + LIFETIME;
  50         int ret;
  51
  52         if (file_exist(keyfile) || file_exist(certfile) || file_exist(cafile)) {
  53                 DEBUG(0,("TLS autogeneration skipped - some TLS files already exist\n"));
  54                 return;
  55         }
  56
  57 #define TLSCHECK(call) do { \
  58         ret = call; \
  59         if (ret < 0) { \
  60                 DEBUG(0,("TLS %s - %s\n", #call, gnutls_strerror(ret))); \
  61                 goto failed; \
  62         } \
  63 } while (0)
  64
  65         TLSCHECK(gnutls_global_init());
  66
  67         DEBUG(0,("Attempting to autogenerate TLS self-signed keys for https for hostname '%s'\n",
  68                  hostname));
  69
  70         DEBUG(3,("Generating private key\n"));
  71         TLSCHECK(gnutls_x509_privkey_init(&key));
  72         TLSCHECK(gnutls_x509_privkey_generate(key,   GNUTLS_PK_RSA, RSA_BITS, 0));
  73
  74         DEBUG(3,("Generating CA private key\n"));
  75         TLSCHECK(gnutls_x509_privkey_init(&cakey));
  76         TLSCHECK(gnutls_x509_privkey_generate(cakey, GNUTLS_PK_RSA, RSA_BITS, 0));
  77
  78         DEBUG(3,("Generating CA certificate\n"));
  79         TLSCHECK(gnutls_x509_crt_init(&cacrt));
  80         TLSCHECK(gnutls_x509_crt_set_dn_by_oid(cacrt,
  81                                       GNUTLS_OID_X520_ORGANIZATION_NAME, 0,
  82                                       ORGANISATION_NAME, strlen(ORGANISATION_NAME)));
  83         TLSCHECK(gnutls_x509_crt_set_dn_by_oid(cacrt,
  84                                       GNUTLS_OID_X520_ORGANIZATIONAL_UNIT_NAME, 0,
  85                                       CA_NAME, strlen(CA_NAME)));
  86         TLSCHECK(gnutls_x509_crt_set_dn_by_oid(cacrt,
  87                                       GNUTLS_OID_X520_COMMON_NAME, 0,
  88                                       hostname, strlen(hostname)));
  89         TLSCHECK(gnutls_x509_crt_set_key(cacrt, cakey));
  90         TLSCHECK(gnutls_x509_crt_set_serial(cacrt, &serial, sizeof(serial)));
  91         TLSCHECK(gnutls_x509_crt_set_activation_time(cacrt, activation));
  92         TLSCHECK(gnutls_x509_crt_set_expiration_time(cacrt, expiry));
  93         TLSCHECK(gnutls_x509_crt_set_ca_status(cacrt, 1));
  94         TLSCHECK(gnutls_x509_crt_set_key_usage(cacrt, GNUTLS_KEY_KEY_CERT_SIGN | GNUTLS_KEY_CRL_SIGN));
  95         TLSCHECK(gnutls_x509_crt_set_version(cacrt, 3));
  96         TLSCHECK(gnutls_x509_crt_get_key_id(cacrt, 0, keyid, &keyidsize));
  97         TLSCHECK(gnutls_x509_crt_set_subject_key_id(cacrt, keyid, keyidsize));
  98         TLSCHECK(gnutls_x509_crt_sign2(cacrt, cacrt, cakey,
  99                                        GNUTLS_DIG_SHA256, 0));
 100
 101         DEBUG(3,("Generating TLS certificate\n"));
 102         TLSCHECK(gnutls_x509_crt_init(&crt));
 103         TLSCHECK(gnutls_x509_crt_set_dn_by_oid(crt,
 104                                       GNUTLS_OID_X520_ORGANIZATION_NAME, 0,
 105                                       ORGANISATION_NAME, strlen(ORGANISATION_NAME)));
 106         TLSCHECK(gnutls_x509_crt_set_dn_by_oid(crt,
 107                                       GNUTLS_OID_X520_ORGANIZATIONAL_UNIT_NAME, 0,
 108                                       UNIT_NAME, strlen(UNIT_NAME)));
 109         TLSCHECK(gnutls_x509_crt_set_dn_by_oid(crt,
 110                                       GNUTLS_OID_X520_COMMON_NAME, 0,
 111                                       hostname, strlen(hostname)));
 112         TLSCHECK(gnutls_x509_crt_set_key(crt, key));
 113         TLSCHECK(gnutls_x509_crt_set_serial(crt, &serial, sizeof(serial)));
 114         TLSCHECK(gnutls_x509_crt_set_activation_time(crt, activation));
 115         TLSCHECK(gnutls_x509_crt_set_expiration_time(crt, expiry));
 116         TLSCHECK(gnutls_x509_crt_set_ca_status(crt, 0));
 117         TLSCHECK(gnutls_x509_crt_set_key_purpose_oid(crt, GNUTLS_KP_TLS_WWW_SERVER, 0));
 118         TLSCHECK(gnutls_x509_crt_set_version(crt, 3));
 119         TLSCHECK(gnutls_x509_crt_get_key_id(crt, 0, keyid, &keyidsize));
 120         TLSCHECK(gnutls_x509_crt_set_subject_key_id(crt, keyid, keyidsize));
 121         TLSCHECK(gnutls_x509_crt_sign2(crt, crt, key,
 122                                        GNUTLS_DIG_SHA256, 0));
 123         TLSCHECK(gnutls_x509_crt_sign2(crt, cacrt, cakey,
 124                                        GNUTLS_DIG_SHA256, 0));
 125
 126         DEBUG(3,("Exporting TLS keys\n"));
 127
 128         bufsize = sizeof(buf);
 129         TLSCHECK(gnutls_x509_crt_export(crt, GNUTLS_X509_FMT_PEM, buf, &bufsize));
 130         if (!file_save(certfile, buf, bufsize)) {
 131                 DEBUG(0,("Unable to save certificate in %s parent dir exists ?\n", certfile));
 132                 goto failed;
 133         }
 134
 135         bufsize = sizeof(buf);
 136         TLSCHECK(gnutls_x509_crt_export(cacrt, GNUTLS_X509_FMT_PEM, buf, &bufsize));
 137         if (!file_save(cafile, buf, bufsize)) {
 138                 DEBUG(0,("Unable to save ca cert in %s parent dir exists ?\n", cafile));
 139                 goto failed;
 140         }
 141
 142         bufsize = sizeof(buf);
 143         TLSCHECK(gnutls_x509_privkey_export(key, GNUTLS_X509_FMT_PEM, buf, &bufsize));
 144         if (!file_save_mode(keyfile, buf, bufsize, 0600)) {
 145                 DEBUG(0,("Unable to save privatekey in %s parent dir exists ?\n", keyfile));
 146                 goto failed;
 147         }
 148
 149         gnutls_x509_privkey_deinit(key);
 150         gnutls_x509_privkey_deinit(cakey);
 151         gnutls_x509_crt_deinit(cacrt);
 152         gnutls_x509_crt_deinit(crt);
 153         gnutls_global_deinit();
 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 }