tests/crypto-tls-x509-helpers.c

   1 /*
   2  * Copyright (C) 2015 Red Hat, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library.  If not, see
  16  * <http://www.gnu.org/licenses/>.
  17  *
  18  * Author: Daniel P. Berrange <berrange@redhat.com>
  19  */
  20
  21 #include "qemu/osdep.h"
  22
  23 #include "crypto-tls-x509-helpers.h"
  24 #include "crypto/init.h"
  25 #include "qemu/sockets.h"
  26
  27 #ifdef QCRYPTO_HAVE_TLS_TEST_SUPPORT
  28
  29 /*
  30  * This stores some static data that is needed when
  31  * encoding extensions in the x509 certs
  32  */
  33 asn1_node pkix_asn1;
  34
  35 /*
  36  * To avoid consuming random entropy to generate keys,
  37  * here's one we prepared earlier :-)
  38  */
  39 gnutls_x509_privkey_t privkey;
  40 # define PRIVATE_KEY \
  41     "-----BEGIN RSA PRIVATE KEY-----\n" \
  42     "MIIG5AIBAAKCAYEAyjWyLSNm5PZvYUKUcDWGqbLX10b2ood+YaFjWSnJrqx/q3qh\n" \
  43     "rVGBJglD25AJENJsmZF3zPP1oMhfIxsXu63Hdkb6Rdlc2RUoUP34x9VC1izH25mR\n" \
  44     "6c8DPDp1d6IraZ/llDMI1HsBFz0qGWtvOHgm815XG4PAr/N8rDsuqfv/cJ01KlnO\n" \
  45     "0OdO5QRXCJf9g/dYd41MPu7wOXk9FqjQlmRoP59HgtJ+zUpE4z+Keruw9cMT9VJj\n" \
  46     "0oT+pQ9ysenqeZ3gbT224T1khrEhT5kifhtFLNyDssRchUUWH0hiqoOO1vgb+850\n" \
  47     "W6/1VdxvuPam48py4diSPi1Vip8NITCOBaX9FIpVp4Ruw4rTPVMNMjq9Cpx/DwMP\n" \
  48     "9MbfXfnaVaZaMrmq67/zPhl0eVbUrecH2hQ3ZB9oIF4GkNskzlWF5+yPy6zqk304\n" \
  49     "AKaiFR6jRyh3YfHo2XFqV8x/hxdsIEXOtEUGhSIcpynsW+ckUCartzu7xbhXjd4b\n" \
  50     "kxJT89+riPFYij09AgMBAAECggGBAKyFkaZXXROeejrmHlV6JZGlp+fhgM38gkRz\n" \
  51     "+Jp7P7rLLAY3E7gXIPQ91WqAAmwazFNdvHPd9USfkCQYmnAi/VoZhrCPmlsQZRxt\n" \
  52     "A5QjjOnEvSPMa6SrXZxGWDCg6R8uMCb4P+FhrPWR1thnRDZOtRTQ+crc50p3mHgt\n" \
  53     "6ktXWIJRbqnag8zSfQqCYGtRmhe8sfsWT+Yl4El4+jjaAVU/B364u7+PLmaiphGp\n" \
  54     "BdJfTsTwEpgtGkPj+osDmhzXcZkfq3V+fz5JLkemsCiQKmn4VJRpg8c3ZmE8NPNt\n" \
  55     "gRtGWZ4W3WKDvhotT65WpQx4+6R8Duux/blNPBmH1Upmwd7kj7GYFBArbCjgd9PT\n" \
  56     "xgfCSUZpgOZHHkcgSB+022a8XncXna7WYYij28SLtwImFyu0nNtqECFQHH5u+k6C\n" \
  57     "LRYBSN+3t3At8dQuk01NVrJBndmjmXRfxpqUtTdeaNgVpdUYRY98s30G68NYGSra\n" \
  58     "aEvhhRSghkcLNetkobpY9pUgeqW/tQKBwQDZHHK9nDMt/zk1TxtILeUSitPXcv1/\n" \
  59     "8ufXqO0miHdH23XuXhIEA6Ef26RRVGDGgpjkveDJK/1w5feJ4H/ni4Vclil/cm38\n" \
  60     "OwRqjjd7ElHJX6JQbsxEx/gNTk5/QW1iAL9TXUalgepsSXYT6AJ0/CJv0jmJSJ36\n" \
  61     "YoKMOM8uqzb2KhN6i+RlJRi5iY53kUhWTJq5ArWvNhUzQNSYODI4bNxlsKSBL2Ik\n" \
  62     "LZ5QKHuaEjQet0IlPlfIb4PzMm8CHa/urOcCgcEA7m3zW/lL5bIFoKPjWig5Lbn1\n" \
  63     "aHfrG2ngqzWtgWtfZqMH8OkZc1Mdhhmvd46titjiLjeI+UP/uHXR0068PnrNngzl\n" \
  64     "tTgwlakzu+bWzqhBm1F+3/341st/FEk07r0P/3/PhezVjwfO8c8Exj7pLxH4wrH0\n" \
  65     "ROHgDbClmlJRu6OO78wk1+Vapf5DWa8YfA+q+fdvr7KvgGyytheKMT/b/dsqOq7y\n" \
  66     "qZPjmaJKWAvV3RWG8lWHFSdHx2IAHMHfGr17Y/w7AoHBALzwZeYebeekiVucGSjq\n" \
  67     "T8SgLhT7zCIx+JMUPjVfYzaUhP/Iu7Lkma6IzWm9nW6Drpy5pUpMzwUWDCLfzU9q\n" \
  68     "eseFIl337kEn9wLn+t5OpgAyCqYmlftxbqvdrrBN9uvnrJjWvqk/8wsDrw9JxAGc\n" \
  69     "fjeD4nBXUqvYWLXApoR9mZoGKedmoH9pFig4zlO9ig8YITnKYuQ0k6SD0b8agJHc\n" \
  70     "Ir0YSUDnRGgpjvFBGbeOCe+FGbohk/EpItJc3IAh5740lwKBwAdXd2DjokSmYKn7\n" \
  71     "oeqKxofz6+yVlLW5YuOiuX78sWlVp87xPolgi84vSEnkKM/Xsc8+goc6YstpRVa+\n" \
  72     "W+mImoA9YW1dF5HkLeWhTAf9AlgoAEIhbeIfTgBv6KNZSv7RDrDPBBxtXx/vAfSg\n" \
  73     "x0ldwk0scZsVYXLKd67yzfV7KdGUdaX4N/xYgfZm/9gCG3+q8NN2KxVHQ5F71BOE\n" \
  74     "JeABOaGo9WvnU+DNMIDZjHJMUWVw4MHz/a/UArDf/2CxaPVBNQKBwASg6j4ohSTk\n" \
  75     "J7aE6RQ3OBmmDDpixcoCJt9u9SjHVYMlbs5CEJGVSczk0SG3y8P1lOWNDSRnMksZ\n" \
  76     "xWnHdP/ogcuYMuvK7UACNAF0zNddtzOhzcpNmejFj+WCHYY/UmPr2/Kf6t7Cxk2K\n" \
  77     "3cZ4tqWsiTmBT8Bknmah7L5DrhS+ZBJliDeFAA8fZHdMH0Xjr4UBp9kF90EMTdW1\n" \
  78     "Xr5uz7ZrMsYpYQI7mmyqV9SSjUg4iBXwVSoag1iDJ1K8Qg/L7Semgg==\n" \
  79     "-----END RSA PRIVATE KEY-----\n"
  80
  81 /*
  82  * This loads the private key we defined earlier
  83  */
  84 static gnutls_x509_privkey_t test_tls_load_key(void)
  85 {
  86     gnutls_x509_privkey_t key;
  87     const gnutls_datum_t data = { (unsigned char *)PRIVATE_KEY,
  88                                   strlen(PRIVATE_KEY) };
  89     int err;
  90
  91     err = gnutls_x509_privkey_init(&key);
  92     if (err < 0) {
  93         g_critical("Failed to init key %s", gnutls_strerror(err));
  94         abort();
  95     }
  96
  97     err = gnutls_x509_privkey_import(key, &data,
  98                                      GNUTLS_X509_FMT_PEM);
  99     if (err < 0) {
 100         if (err != GNUTLS_E_BASE64_UNEXPECTED_HEADER_ERROR &&
 101             err != GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
 102             g_critical("Failed to import key %s", gnutls_strerror(err));
 103             abort();
 104         }
 105
 106         err = gnutls_x509_privkey_import_pkcs8(
 107             key, &data, GNUTLS_X509_FMT_PEM, NULL, 0);
 108         if (err < 0) {
 109             g_critical("Failed to import PKCS8 key %s", gnutls_strerror(err));
 110             abort();
 111         }
 112     }
 113
 114     return key;
 115 }
 116
 117
 118 void test_tls_init(const char *keyfile)
 119 {
 120     qcrypto_init(&error_abort);
 121
 122     if (asn1_array2tree(pkix_asn1_tab, &pkix_asn1, NULL) != ASN1_SUCCESS) {
 123         abort();
 124     }
 125
 126     privkey = test_tls_load_key();
 127     if (!g_file_set_contents(keyfile, PRIVATE_KEY, -1, NULL)) {
 128         abort();
 129     }
 130 }
 131
 132
 133 void test_tls_cleanup(const char *keyfile)
 134 {
 135     asn1_delete_structure(&pkix_asn1);
 136     unlink(keyfile);
 137 }
 138
 139 /*
 140  * Turns an ASN1 object into a DER encoded byte array
 141  */
 142 static void test_tls_der_encode(asn1_node src,
 143                                 const char *src_name,
 144                                 gnutls_datum_t *res)
 145 {
 146   int size;
 147   char *data = NULL;
 148
 149   size = 0;
 150   asn1_der_coding(src, src_name, NULL, &size, NULL);
 151
 152   data = g_new0(char, size);
 153
 154   asn1_der_coding(src, src_name, data, &size, NULL);
 155
 156   res->data = (unsigned char *)data;
 157   res->size = size;
 158 }
 159
 160
 161 static void
 162 test_tls_get_ipaddr(const char *addrstr,
 163                     char **data,
 164                     int *datalen)
 165 {
 166     struct addrinfo *res;
 167     struct addrinfo hints;
 168
 169     memset(&hints, 0, sizeof(hints));
 170     hints.ai_flags = AI_NUMERICHOST;
 171     g_assert(getaddrinfo(addrstr, NULL, &hints, &res) == 0);
 172
 173     *datalen = res->ai_addrlen;
 174     *data = g_new(char, *datalen);
 175     memcpy(*data, res->ai_addr, *datalen);
 176     freeaddrinfo(res);
 177 }
 178
 179 /*
 180  * This is a fairly lame x509 certificate generator.
 181  *
 182  * Do not copy/use this code for generating real certificates
 183  * since it leaves out many things that you would want in
 184  * certificates for real world usage.
 185  *
 186  * This is good enough only for doing tests of the QEMU
 187  * TLS certificate code
 188  */
 189 void
 190 test_tls_generate_cert(QCryptoTLSTestCertReq *req,
 191                        gnutls_x509_crt_t ca)
 192 {
 193     gnutls_x509_crt_t crt;
 194     int err;
 195     static char buffer[1024 * 1024];
 196     size_t size = sizeof(buffer);
 197     char serial[5] = { 1, 2, 3, 4, 0 };
 198     gnutls_datum_t der;
 199     time_t start = time(NULL) + (60 * 60 * req->start_offset);
 200     time_t expire = time(NULL) + (60 * 60 * (req->expire_offset
 201                                              ? req->expire_offset : 24));
 202
 203     /*
 204      * Prepare our new certificate object
 205      */
 206     err = gnutls_x509_crt_init(&crt);
 207     if (err < 0) {
 208         g_critical("Failed to initialize certificate %s", gnutls_strerror(err));
 209         abort();
 210     }
 211     err = gnutls_x509_crt_set_key(crt, privkey);
 212     if (err < 0) {
 213         g_critical("Failed to set certificate key %s", gnutls_strerror(err));
 214         abort();
 215     }
 216
 217     /*
 218      * A v3 certificate is required in order to be able
 219      * set any of the basic constraints, key purpose and
 220      * key usage data
 221      */
 222     gnutls_x509_crt_set_version(crt, 3);
 223
 224     if (req->country) {
 225         err = gnutls_x509_crt_set_dn_by_oid(
 226             crt, GNUTLS_OID_X520_COUNTRY_NAME, 0,
 227             req->country, strlen(req->country));
 228         if (err < 0) {
 229             g_critical("Failed to set certificate country name %s",
 230                        gnutls_strerror(err));
 231             abort();
 232         }
 233     }
 234     if (req->cn) {
 235         err = gnutls_x509_crt_set_dn_by_oid(
 236             crt, GNUTLS_OID_X520_COMMON_NAME, 0,
 237             req->cn, strlen(req->cn));
 238         if (err < 0) {
 239             g_critical("Failed to set certificate common name %s",
 240                        gnutls_strerror(err));
 241             abort();
 242         }
 243     }
 244
 245     /*
 246      * Setup the subject altnames, which are used
 247      * for hostname checks in live sessions
 248      */
 249     if (req->altname1) {
 250         err = gnutls_x509_crt_set_subject_alt_name(
 251             crt, GNUTLS_SAN_DNSNAME,
 252             req->altname1,
 253             strlen(req->altname1),
 254             GNUTLS_FSAN_APPEND);
 255         if (err < 0) {
 256             g_critical("Failed to set certificate alt name %s",
 257                        gnutls_strerror(err));
 258             abort();
 259         }
 260     }
 261     if (req->altname2) {
 262         err = gnutls_x509_crt_set_subject_alt_name(
 263             crt, GNUTLS_SAN_DNSNAME,
 264             req->altname2,
 265             strlen(req->altname2),
 266             GNUTLS_FSAN_APPEND);
 267         if (err < 0) {
 268             g_critical("Failed to set certificate %s alt name",
 269                        gnutls_strerror(err));
 270             abort();
 271         }
 272     }
 273
 274     /*
 275      * IP address need to be put into the cert in their
 276      * raw byte form, not strings, hence this is a little
 277      * more complicated
 278      */
 279     if (req->ipaddr1) {
 280         char *data;
 281         int len;
 282
 283         test_tls_get_ipaddr(req->ipaddr1, &data, &len);
 284
 285         err = gnutls_x509_crt_set_subject_alt_name(
 286             crt, GNUTLS_SAN_IPADDRESS,
 287             data, len, GNUTLS_FSAN_APPEND);
 288         if (err < 0) {
 289             g_critical("Failed to set certificate alt name %s",
 290                        gnutls_strerror(err));
 291             abort();
 292         }
 293         g_free(data);
 294     }
 295     if (req->ipaddr2) {
 296         char *data;
 297         int len;
 298
 299         test_tls_get_ipaddr(req->ipaddr2, &data, &len);
 300
 301         err = gnutls_x509_crt_set_subject_alt_name(
 302             crt, GNUTLS_SAN_IPADDRESS,
 303             data, len, GNUTLS_FSAN_APPEND);
 304         if (err < 0) {
 305             g_critical("Failed to set certificate alt name %s",
 306                        gnutls_strerror(err));
 307             abort();
 308         }
 309         g_free(data);
 310     }
 311
 312
 313     /*
 314      * Basic constraints are used to decide if the cert
 315      * is for a CA or not. We can't use the convenient
 316      * gnutls API for setting this, since it hardcodes
 317      * the 'critical' field which we want control over
 318      */
 319     if (req->basicConstraintsEnable) {
 320         asn1_node ext = NULL;
 321
 322         asn1_create_element(pkix_asn1, "PKIX1.BasicConstraints", &ext);
 323         asn1_write_value(ext, "cA",
 324                          req->basicConstraintsIsCA ? "TRUE" : "FALSE", 1);
 325         asn1_write_value(ext, "pathLenConstraint", NULL, 0);
 326         test_tls_der_encode(ext, "", &der);
 327         err = gnutls_x509_crt_set_extension_by_oid(
 328             crt, "2.5.29.19",
 329             der.data, der.size,
 330             req->basicConstraintsCritical);
 331         if (err < 0) {
 332             g_critical("Failed to set certificate basic constraints %s",
 333                        gnutls_strerror(err));
 334             g_free(der.data);
 335             abort();
 336         }
 337         asn1_delete_structure(&ext);
 338         g_free(der.data);
 339     }
 340
 341     /*
 342      * Next up the key usage extension. Again we can't
 343      * use the gnutls API since it hardcodes the extension
 344      * to be 'critical'
 345      */
 346     if (req->keyUsageEnable) {
 347         asn1_node ext = NULL;
 348         char str[2];
 349
 350         str[0] = req->keyUsageValue & 0xff;
 351         str[1] = (req->keyUsageValue >> 8) & 0xff;
 352
 353         asn1_create_element(pkix_asn1, "PKIX1.KeyUsage", &ext);
 354         asn1_write_value(ext, "", str, 9);
 355         test_tls_der_encode(ext, "", &der);
 356         err = gnutls_x509_crt_set_extension_by_oid(
 357             crt, "2.5.29.15",
 358             der.data, der.size,
 359             req->keyUsageCritical);
 360         if (err < 0) {
 361             g_critical("Failed to set certificate key usage %s",
 362                        gnutls_strerror(err));
 363             g_free(der.data);
 364             abort();
 365         }
 366         asn1_delete_structure(&ext);
 367         g_free(der.data);
 368     }
 369
 370     /*
 371      * Finally the key purpose extension. This time
 372      * gnutls has the opposite problem, always hardcoding
 373      * it to be non-critical. So once again we have to
 374      * set this the hard way building up ASN1 data ourselves
 375      */
 376     if (req->keyPurposeEnable) {
 377         asn1_node ext = NULL;
 378
 379         asn1_create_element(pkix_asn1, "PKIX1.ExtKeyUsageSyntax", &ext);
 380         if (req->keyPurposeOID1) {
 381             asn1_write_value(ext, "", "NEW", 1);
 382             asn1_write_value(ext, "?LAST", req->keyPurposeOID1, 1);
 383         }
 384         if (req->keyPurposeOID2) {
 385             asn1_write_value(ext, "", "NEW", 1);
 386             asn1_write_value(ext, "?LAST", req->keyPurposeOID2, 1);
 387         }
 388         test_tls_der_encode(ext, "", &der);
 389         err = gnutls_x509_crt_set_extension_by_oid(
 390             crt, "2.5.29.37",
 391             der.data, der.size,
 392             req->keyPurposeCritical);
 393         if (err < 0) {
 394             g_critical("Failed to set certificate key purpose %s",
 395                        gnutls_strerror(err));
 396             g_free(der.data);
 397             abort();
 398         }
 399         asn1_delete_structure(&ext);
 400         g_free(der.data);
 401     }
 402
 403     /*
 404      * Any old serial number will do, so lets pick 5
 405      */
 406     err = gnutls_x509_crt_set_serial(crt, serial, 5);
 407     if (err < 0) {
 408         g_critical("Failed to set certificate serial %s",
 409                    gnutls_strerror(err));
 410         abort();
 411     }
 412
 413     err = gnutls_x509_crt_set_activation_time(crt, start);
 414     if (err < 0) {
 415         g_critical("Failed to set certificate activation %s",
 416                    gnutls_strerror(err));
 417         abort();
 418     }
 419     err = gnutls_x509_crt_set_expiration_time(crt, expire);
 420     if (err < 0) {
 421         g_critical("Failed to set certificate expiration %s",
 422                    gnutls_strerror(err));
 423         abort();
 424     }
 425
 426
 427     /*
 428      * If no 'ca' is set then we are self signing
 429      * the cert. This is done for the root CA certs
 430      */
 431     err = gnutls_x509_crt_sign2(crt, ca ? ca : crt, privkey,
 432                                 GNUTLS_DIG_SHA256, 0);
 433     if (err < 0) {
 434         g_critical("Failed to sign certificate %s",
 435                    gnutls_strerror(err));
 436         abort();
 437     }
 438
 439     /*
 440      * Finally write the new cert out to disk
 441      */
 442     err = gnutls_x509_crt_export(
 443         crt, GNUTLS_X509_FMT_PEM, buffer, &size);
 444     if (err < 0) {
 445         g_critical("Failed to export certificate %s: %d",
 446                    gnutls_strerror(err), err);
 447         abort();
 448     }
 449
 450     if (!g_file_set_contents(req->filename, buffer, -1, NULL)) {
 451         g_critical("Failed to write certificate %s",
 452                    req->filename);
 453         abort();
 454     }
 455
 456     req->crt = crt;
 457 }
 458
 459
 460 void test_tls_write_cert_chain(const char *filename,
 461                                gnutls_x509_crt_t *certs,
 462                                size_t ncerts)
 463 {
 464     size_t i;
 465     size_t capacity = 1024, offset = 0;
 466     char *buffer = g_new0(char, capacity);
 467     int err;
 468
 469     for (i = 0; i < ncerts; i++) {
 470         size_t len = capacity - offset;
 471     retry:
 472         err = gnutls_x509_crt_export(certs[i], GNUTLS_X509_FMT_PEM,
 473                                      buffer + offset, &len);
 474         if (err < 0) {
 475             if (err == GNUTLS_E_SHORT_MEMORY_BUFFER) {
 476                 buffer = g_renew(char, buffer, offset + len);
 477                 capacity = offset + len;
 478                 goto retry;
 479             }
 480             g_critical("Failed to export certificate chain %s: %d",
 481                        gnutls_strerror(err), err);
 482             abort();
 483         }
 484         offset += len;
 485     }
 486
 487     if (!g_file_set_contents(filename, buffer, offset, NULL)) {
 488         abort();
 489     }
 490     g_free(buffer);
 491 }
 492
 493
 494 void test_tls_discard_cert(QCryptoTLSTestCertReq *req)
 495 {
 496     if (!req->crt) {
 497         return;
 498     }
 499
 500     gnutls_x509_crt_deinit(req->crt);
 501     req->crt = NULL;
 502
 503     if (getenv("QEMU_TEST_DEBUG_CERTS") == NULL) {
 504         unlink(req->filename);
 505     }
 506 }
 507
 508 #endif /* QCRYPTO_HAVE_TLS_TEST_SUPPORT */