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/*
Unix SMB/CIFS implementation.
auto-generate self signed TLS certificates
Copyright (C) Andrew Tridgell 2005
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "lib/tls/tls.h"
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#define ORGANISATION_NAME "Samba Administration"
#define CA_NAME "Samba - temporary autogenerated CA certificate"
#define UNIT_NAME "Samba - temporary autogenerated HOST certificate"
#define LIFETIME 700*24*60*60
/* FIPS140-2 only allows 2048 or 3072 prime sizes. */
#define RSA_BITS gnutls_fips140_mode_enabled() ? 3072 : 4096
/*
auto-generate a set of self signed certificates
*/
void tls_cert_generate(TALLOC_CTX *mem_ctx,
const char *hostname,
const char *keyfile, const char *certfile,
const char *cafile)
{
gnutls_x509_crt_t cacrt, crt;
gnutls_x509_privkey_t key, cakey;
uint32_t serial = (uint32_t)time(NULL);
unsigned char keyid[100];
char buf[4096];
size_t bufsize;
size_t keyidsize = sizeof(keyid);
time_t activation = time(NULL), expiry = activation + LIFETIME;
int ret;
if (file_exist(keyfile) || file_exist(certfile) || file_exist(cafile)) {
DEBUG(0,("TLS autogeneration skipped - some TLS files already exist\n"));
return;
}
#define TLSCHECK(call) do { \
ret = call; \
if (ret < 0) { \
DEBUG(0,("TLS %s - %s\n", #call, gnutls_strerror(ret))); \
goto failed; \
} \
} while (0)
DEBUG(0,("Attempting to autogenerate TLS self-signed keys for https for hostname '%s'\n",
hostname));
DEBUG(3,("Generating private key\n"));
TLSCHECK(gnutls_x509_privkey_init(&key));
TLSCHECK(gnutls_x509_privkey_generate(key, GNUTLS_PK_RSA, RSA_BITS, 0));
DEBUG(3,("Generating CA private key\n"));
TLSCHECK(gnutls_x509_privkey_init(&cakey));
TLSCHECK(gnutls_x509_privkey_generate(cakey, GNUTLS_PK_RSA, RSA_BITS, 0));
DEBUG(3,("Generating CA certificate\n"));
TLSCHECK(gnutls_x509_crt_init(&cacrt));
TLSCHECK(gnutls_x509_crt_set_dn_by_oid(cacrt,
GNUTLS_OID_X520_ORGANIZATION_NAME, 0,
ORGANISATION_NAME, strlen(ORGANISATION_NAME)));
TLSCHECK(gnutls_x509_crt_set_dn_by_oid(cacrt,
GNUTLS_OID_X520_ORGANIZATIONAL_UNIT_NAME, 0,
CA_NAME, strlen(CA_NAME)));
TLSCHECK(gnutls_x509_crt_set_dn_by_oid(cacrt,
GNUTLS_OID_X520_COMMON_NAME, 0,
hostname, strlen(hostname)));
TLSCHECK(gnutls_x509_crt_set_key(cacrt, cakey));
TLSCHECK(gnutls_x509_crt_set_serial(cacrt, &serial, sizeof(serial)));
TLSCHECK(gnutls_x509_crt_set_activation_time(cacrt, activation));
TLSCHECK(gnutls_x509_crt_set_expiration_time(cacrt, expiry));
TLSCHECK(gnutls_x509_crt_set_ca_status(cacrt, 1));
TLSCHECK(gnutls_x509_crt_set_key_usage(cacrt, GNUTLS_KEY_KEY_CERT_SIGN | GNUTLS_KEY_CRL_SIGN));
TLSCHECK(gnutls_x509_crt_set_version(cacrt, 3));
TLSCHECK(gnutls_x509_crt_get_key_id(cacrt, 0, keyid, &keyidsize));
TLSCHECK(gnutls_x509_crt_set_subject_key_id(cacrt, keyid, keyidsize));
TLSCHECK(gnutls_x509_crt_sign2(cacrt, cacrt, cakey,
GNUTLS_DIG_SHA256, 0));
DEBUG(3,("Generating TLS certificate\n"));
TLSCHECK(gnutls_x509_crt_init(&crt));
TLSCHECK(gnutls_x509_crt_set_dn_by_oid(crt,
GNUTLS_OID_X520_ORGANIZATION_NAME, 0,
ORGANISATION_NAME, strlen(ORGANISATION_NAME)));
TLSCHECK(gnutls_x509_crt_set_dn_by_oid(crt,
GNUTLS_OID_X520_ORGANIZATIONAL_UNIT_NAME, 0,
UNIT_NAME, strlen(UNIT_NAME)));
TLSCHECK(gnutls_x509_crt_set_dn_by_oid(crt,
GNUTLS_OID_X520_COMMON_NAME, 0,
hostname, strlen(hostname)));
TLSCHECK(gnutls_x509_crt_set_key(crt, key));
TLSCHECK(gnutls_x509_crt_set_serial(crt, &serial, sizeof(serial)));
TLSCHECK(gnutls_x509_crt_set_activation_time(crt, activation));
TLSCHECK(gnutls_x509_crt_set_expiration_time(crt, expiry));
TLSCHECK(gnutls_x509_crt_set_ca_status(crt, 0));
TLSCHECK(gnutls_x509_crt_set_key_purpose_oid(crt, GNUTLS_KP_TLS_WWW_SERVER, 0));
TLSCHECK(gnutls_x509_crt_set_version(crt, 3));
TLSCHECK(gnutls_x509_crt_get_key_id(crt, 0, keyid, &keyidsize));
TLSCHECK(gnutls_x509_crt_set_subject_key_id(crt, keyid, keyidsize));
TLSCHECK(gnutls_x509_crt_sign2(crt, crt, key,
GNUTLS_DIG_SHA256, 0));
TLSCHECK(gnutls_x509_crt_sign2(crt, cacrt, cakey,
GNUTLS_DIG_SHA256, 0));
DEBUG(3,("Exporting TLS keys\n"));
bufsize = sizeof(buf);
TLSCHECK(gnutls_x509_crt_export(crt, GNUTLS_X509_FMT_PEM, buf, &bufsize));
if (!file_save(certfile, buf, bufsize)) {
DEBUG(0,("Unable to save certificate in %s parent dir exists ?\n", certfile));
goto failed;
}
bufsize = sizeof(buf);
TLSCHECK(gnutls_x509_crt_export(cacrt, GNUTLS_X509_FMT_PEM, buf, &bufsize));
if (!file_save(cafile, buf, bufsize)) {
DEBUG(0,("Unable to save ca cert in %s parent dir exists ?\n", cafile));
goto failed;
}
bufsize = sizeof(buf);
TLSCHECK(gnutls_x509_privkey_export(key, GNUTLS_X509_FMT_PEM, buf, &bufsize));
if (!file_save_mode(keyfile, buf, bufsize, 0600)) {
DEBUG(0,("Unable to save privatekey in %s parent dir exists ?\n", keyfile));
goto failed;
}
gnutls_x509_privkey_deinit(key);
gnutls_x509_privkey_deinit(cakey);
gnutls_x509_crt_deinit(cacrt);
gnutls_x509_crt_deinit(crt);
DEBUG(0,("TLS self-signed keys generated OK\n"));
return;
failed:
DEBUG(0,("TLS certificate generation failed\n"));
}
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