diff options
Diffstat (limited to 'qemu/tests/crypto-tls-x509-helpers.c')
| -rw-r--r-- | qemu/tests/crypto-tls-x509-helpers.c | 485 |
1 files changed, 485 insertions, 0 deletions
diff --git a/qemu/tests/crypto-tls-x509-helpers.c b/qemu/tests/crypto-tls-x509-helpers.c new file mode 100644 index 000000000..64073d3bd --- /dev/null +++ b/qemu/tests/crypto-tls-x509-helpers.c @@ -0,0 +1,485 @@ +/* + * 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 */ |