/* * Copyright (C) 2015 Red Hat, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library. If not, see * <http://www.gnu.org/licenses/>. * * Author: Daniel P. Berrange <berrange@redhat.com> */ #include "qemu/osdep.h" #include "crypto-tls-x509-helpers.h" #include "qemu/sockets.h" #ifdef QCRYPTO_HAVE_TLS_TEST_SUPPORT /* * This stores some static data that is needed when * encoding extensions in the x509 certs */ ASN1_TYPE pkix_asn1; /* * To avoid consuming random entropy to generate keys, * here's one we prepared earlier :-) */ gnutls_x509_privkey_t privkey; # define PRIVATE_KEY \ "-----BEGIN PRIVATE KEY-----\n" \ "MIICdQIBADANBgkqhkiG9w0BAQEFAASCAl8wggJbAgEAAoGBALVcr\n" \ "BL40Tm6yq88FBhJNw1aaoCjmtg0l4dWQZ/e9Fimx4ARxFpT+ji4FE\n" \ "Cgl9s/SGqC+1nvlkm9ViSo0j7MKDbnDB+VRHDvMAzQhA2X7e8M0n9\n" \ "rPolUY2lIVC83q0BBaOBkCj2RSmT2xTEbbC2xLukSrg2WP/ihVOxc\n" \ "kXRuyFtzAgMBAAECgYB7slBexDwXrtItAMIH6m/U+LUpNe0Xx48OL\n" \ "IOn4a4whNgO/o84uIwygUK27ZGFZT0kAGAk8CdF9hA6ArcbQ62s1H\n" \ "myxrUbF9/mrLsQw1NEqpuUk9Ay2Tx5U/wPx35S3W/X2AvR/ZpTnCn\n" \ "2q/7ym9fyiSoj86drD7BTvmKXlOnOwQJBAPOFMp4mMa9NGpGuEssO\n" \ "m3Uwbp6lhcP0cA9MK+iOmeANpoKWfBdk5O34VbmeXnGYWEkrnX+9J\n" \ "bM4wVhnnBWtgBMCQQC+qAEmvwcfhauERKYznMVUVksyeuhxhCe7EK\n" \ "mPh+U2+g0WwdKvGDgO0PPt1gq0ILEjspMDeMHVdTwkaVBo/uMhAkA\n" \ "Z5SsZyCP2aTOPFDypXRdI4eqRcjaEPOUBq27r3uYb/jeboVb2weLa\n" \ "L1MmVuHiIHoa5clswPdWVI2y0em2IGoDAkBPSp/v9VKJEZabk9Frd\n" \ "a+7u4fanrM9QrEjY3KhduslSilXZZSxrWjjAJPyPiqFb3M8XXA26W\n" \ "nz1KYGnqYKhLcBAkB7dt57n9xfrhDpuyVEv+Uv1D3VVAhZlsaZ5Pp\n" \ "dcrhrkJn2sa/+O8OKvdrPSeeu/N5WwYhJf61+CPoenMp7IFci\n" \ "-----END PRIVATE KEY-----\n" /* * This loads the private key we defined earlier */ static gnutls_x509_privkey_t test_tls_load_key(void) { gnutls_x509_privkey_t key; const gnutls_datum_t data = { (unsigned char *)PRIVATE_KEY, strlen(PRIVATE_KEY) }; int err; err = gnutls_x509_privkey_init(&key); if (err < 0) { g_critical("Failed to init key %s", gnutls_strerror(err)); abort(); } err = gnutls_x509_privkey_import(key, &data, GNUTLS_X509_FMT_PEM); if (err < 0) { if (err != GNUTLS_E_BASE64_UNEXPECTED_HEADER_ERROR && err != GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) { g_critical("Failed to import key %s", gnutls_strerror(err)); abort(); } err = gnutls_x509_privkey_import_pkcs8( key, &data, GNUTLS_X509_FMT_PEM, NULL, 0); if (err < 0) { g_critical("Failed to import PKCS8 key %s", gnutls_strerror(err)); abort(); } } return key; } void test_tls_init(const char *keyfile) { gnutls_global_init(); if (asn1_array2tree(pkix_asn1_tab, &pkix_asn1, NULL) != ASN1_SUCCESS) { abort(); } privkey = test_tls_load_key(); if (!g_file_set_contents(keyfile, PRIVATE_KEY, -1, NULL)) { abort(); } } void test_tls_cleanup(const char *keyfile) { asn1_delete_structure(&pkix_asn1); unlink(keyfile); } /* * Turns an ASN1 object into a DER encoded byte array */ static void test_tls_der_encode(ASN1_TYPE src, const char *src_name, gnutls_datum_t *res) { int size; char *data = NULL; size = 0; asn1_der_coding(src, src_name, NULL, &size, NULL); data = g_new0(char, size); asn1_der_coding(src, src_name, data, &size, NULL); res->data = (unsigned char *)data; res->size = size; } static void test_tls_get_ipaddr(const char *addrstr, char **data, int *datalen) { struct addrinfo *res; struct addrinfo hints; memset(&hints, 0, sizeof(hints)); hints.ai_flags = AI_NUMERICHOST; g_assert(getaddrinfo(addrstr, NULL, &hints, &res) == 0); *datalen = res->ai_addrlen; *data = g_new(char, *datalen); memcpy(*data, res->ai_addr, *datalen); freeaddrinfo(res); } /* * This is a fairly lame x509 certificate generator. * * Do not copy/use this code for generating real certificates * since it leaves out many things that you would want in * certificates for real world usage. * * This is good enough only for doing tests of the QEMU * TLS certificate code */ void test_tls_generate_cert(QCryptoTLSTestCertReq *req, gnutls_x509_crt_t ca) { gnutls_x509_crt_t crt; int err; static char buffer[1024 * 1024]; size_t size = sizeof(buffer); char serial[5] = { 1, 2, 3, 4, 0 }; gnutls_datum_t der; time_t start = time(NULL) + (60 * 60 * req->start_offset); time_t expire = time(NULL) + (60 * 60 * (req->expire_offset ? req->expire_offset : 24)); /* * Prepare our new certificate object */ err = gnutls_x509_crt_init(&crt); if (err < 0) { g_critical("Failed to initialize certificate %s", gnutls_strerror(err)); abort(); } err = gnutls_x509_crt_set_key(crt, privkey); if (err < 0) { g_critical("Failed to set certificate key %s", gnutls_strerror(err)); abort(); } /* * A v3 certificate is required in order to be able * set any of the basic constraints, key purpose and * key usage data */ gnutls_x509_crt_set_version(crt, 3); if (req->country) { err = gnutls_x509_crt_set_dn_by_oid( crt, GNUTLS_OID_X520_COUNTRY_NAME, 0, req->country, strlen(req->country)); if (err < 0) { g_critical("Failed to set certificate country name %s", gnutls_strerror(err)); abort(); } } if (req->cn) { err = gnutls_x509_crt_set_dn_by_oid( crt, GNUTLS_OID_X520_COMMON_NAME, 0, req->cn, strlen(req->cn)); if (err < 0) { g_critical("Failed to set certificate common name %s", gnutls_strerror(err)); abort(); } } /* * Setup the subject altnames, which are used * for hostname checks in live sessions */ if (req->altname1) { err = gnutls_x509_crt_set_subject_alt_name( crt, GNUTLS_SAN_DNSNAME, req->altname1, strlen(req->altname1), GNUTLS_FSAN_APPEND); if (err < 0) { g_critical("Failed to set certificate alt name %s", gnutls_strerror(err)); abort(); } } if (req->altname2) { err = gnutls_x509_crt_set_subject_alt_name( crt, GNUTLS_SAN_DNSNAME, req->altname2, strlen(req->altname2), GNUTLS_FSAN_APPEND); if (err < 0) { g_critical("Failed to set certificate %s alt name", gnutls_strerror(err)); abort(); } } /* * IP address need to be put into the cert in their * raw byte form, not strings, hence this is a little * more complicated */ if (req->ipaddr1) { char *data; int len; test_tls_get_ipaddr(req->ipaddr1, &data, &len); err = gnutls_x509_crt_set_subject_alt_name( crt, GNUTLS_SAN_IPADDRESS, data, len, GNUTLS_FSAN_APPEND); if (err < 0) { g_critical("Failed to set certificate alt name %s", gnutls_strerror(err)); abort(); } g_free(data); } if (req->ipaddr2) { char *data; int len; test_tls_get_ipaddr(req->ipaddr2, &data, &len); err = gnutls_x509_crt_set_subject_alt_name( crt, GNUTLS_SAN_IPADDRESS, data, len, GNUTLS_FSAN_APPEND); if (err < 0) { g_critical("Failed to set certificate alt name %s", gnutls_strerror(err)); abort(); } g_free(data); } /* * Basic constraints are used to decide if the cert * is for a CA or not. We can't use the convenient * gnutls API for setting this, since it hardcodes * the 'critical' field which we want control over */ if (req->basicConstraintsEnable) { ASN1_TYPE ext = ASN1_TYPE_EMPTY; asn1_create_element(pkix_asn1, "PKIX1.BasicConstraints", &ext); asn1_write_value(ext, "cA", req->basicConstraintsIsCA ? "TRUE" : "FALSE", 1); asn1_write_value(ext, "pathLenConstraint", NULL, 0); test_tls_der_encode(ext, "", &der); err = gnutls_x509_crt_set_extension_by_oid( crt, "2.5.29.19", der.data, der.size, req->basicConstraintsCritical); if (err < 0) { g_critical("Failed to set certificate basic constraints %s", gnutls_strerror(err)); g_free(der.data); abort(); } asn1_delete_structure(&ext); g_free(der.data); } /* * Next up the key usage extension. Again we can't * use the gnutls API since it hardcodes the extension * to be 'critical' */ if (req->keyUsageEnable) { ASN1_TYPE ext = ASN1_TYPE_EMPTY; char str[2]; str[0] = req->keyUsageValue & 0xff; str[1] = (req->keyUsageValue >> 8) & 0xff; asn1_create_element(pkix_asn1, "PKIX1.KeyUsage", &ext); asn1_write_value(ext, "", str, 9); test_tls_der_encode(ext, "", &der); err = gnutls_x509_crt_set_extension_by_oid( crt, "2.5.29.15", der.data, der.size, req->keyUsageCritical); if (err < 0) { g_critical("Failed to set certificate key usage %s", gnutls_strerror(err)); g_free(der.data); abort(); } asn1_delete_structure(&ext); g_free(der.data); } /* * Finally the key purpose extension. This time * gnutls has the opposite problem, always hardcoding * it to be non-critical. So once again we have to * set this the hard way building up ASN1 data ourselves */ if (req->keyPurposeEnable) { ASN1_TYPE ext = ASN1_TYPE_EMPTY; asn1_create_element(pkix_asn1, "PKIX1.ExtKeyUsageSyntax", &ext); if (req->keyPurposeOID1) { asn1_write_value(ext, "", "NEW", 1); asn1_write_value(ext, "?LAST", req->keyPurposeOID1, 1); } if (req->keyPurposeOID2) { asn1_write_value(ext, "", "NEW", 1); asn1_write_value(ext, "?LAST", req->keyPurposeOID2, 1); } test_tls_der_encode(ext, "", &der); err = gnutls_x509_crt_set_extension_by_oid( crt, "2.5.29.37", der.data, der.size, req->keyPurposeCritical); if (err < 0) { g_critical("Failed to set certificate key purpose %s", gnutls_strerror(err)); g_free(der.data); abort(); } asn1_delete_structure(&ext); g_free(der.data); } /* * Any old serial number will do, so lets pick 5 */ err = gnutls_x509_crt_set_serial(crt, serial, 5); if (err < 0) { g_critical("Failed to set certificate serial %s", gnutls_strerror(err)); abort(); } err = gnutls_x509_crt_set_activation_time(crt, start); if (err < 0) { g_critical("Failed to set certificate activation %s", gnutls_strerror(err)); abort(); } err = gnutls_x509_crt_set_expiration_time(crt, expire); if (err < 0) { g_critical("Failed to set certificate expiration %s", gnutls_strerror(err)); abort(); } /* * If no 'ca' is set then we are self signing * the cert. This is done for the root CA certs */ err = gnutls_x509_crt_sign(crt, ca ? ca : crt, privkey); if (err < 0) { g_critical("Failed to sign certificate %s", gnutls_strerror(err)); abort(); } /* * Finally write the new cert out to disk */ err = gnutls_x509_crt_export( crt, GNUTLS_X509_FMT_PEM, buffer, &size); if (err < 0) { g_critical("Failed to export certificate %s: %d", gnutls_strerror(err), err); abort(); } if (!g_file_set_contents(req->filename, buffer, -1, NULL)) { g_critical("Failed to write certificate %s", req->filename); abort(); } req->crt = crt; } void test_tls_write_cert_chain(const char *filename, gnutls_x509_crt_t *certs, size_t ncerts) { size_t i; size_t capacity = 1024, offset = 0; char *buffer = g_new0(char, capacity); int err; for (i = 0; i < ncerts; i++) { size_t len = capacity - offset; retry: err = gnutls_x509_crt_export(certs[i], GNUTLS_X509_FMT_PEM, buffer + offset, &len); if (err < 0) { if (err == GNUTLS_E_SHORT_MEMORY_BUFFER) { buffer = g_renew(char, buffer, offset + len); capacity = offset + len; goto retry; } g_critical("Failed to export certificate chain %s: %d", gnutls_strerror(err), err); abort(); } offset += len; } if (!g_file_set_contents(filename, buffer, offset, NULL)) { abort(); } g_free(buffer); } void test_tls_discard_cert(QCryptoTLSTestCertReq *req) { if (!req->crt) { return; } gnutls_x509_crt_deinit(req->crt); req->crt = NULL; if (getenv("QEMU_TEST_DEBUG_CERTS") == NULL) { unlink(req->filename); } } #endif /* QCRYPTO_HAVE_TLS_TEST_SUPPORT */