test/danetest.c

   1 /*
   2  * Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <string.h>
  12 #include <ctype.h>
  13 #include <limits.h>
  14 #include <errno.h>
  15
  16 #include <openssl/crypto.h>
  17 #include <openssl/evp.h>
  18 #include <openssl/x509.h>
  19 #include <openssl/ssl.h>
  20 #include <openssl/err.h>
  21 #include <openssl/conf.h>
  22 #ifndef OPENSSL_NO_ENGINE
  23 # include <openssl/engine.h>
  24 #endif
  25 #include "testutil.h"
  26
  27 #include "internal/nelem.h"
  28
  29 #define _UC(c) ((unsigned char)(c))
  30
  31 static const char *basedomain;
  32 static const char *CAfile;
  33 static const char *tlsafile;
  34
  35 /*
  36  * Forward declaration, of function that uses internal interfaces, from headers
  37  * included at the end of this module.
  38  */
  39 static void store_ctx_dane_init(X509_STORE_CTX *, SSL *);
  40
  41 static int saved_errno;
  42
  43 static void save_errno(void)
  44 {
  45     saved_errno = errno;
  46 }
  47
  48 static int restore_errno(void)
  49 {
  50     int ret = errno;
  51     errno = saved_errno;
  52     return ret;
  53 }
  54
  55 static int verify_chain(SSL *ssl, STACK_OF(X509) *chain)
  56 {
  57     X509_STORE_CTX *store_ctx = NULL;
  58     SSL_CTX *ssl_ctx = NULL;
  59     X509_STORE *store = NULL;
  60     int ret = 0;
  61     int store_ctx_idx = SSL_get_ex_data_X509_STORE_CTX_idx();
  62
  63     if (!TEST_ptr(store_ctx = X509_STORE_CTX_new())
  64             || !TEST_ptr(ssl_ctx = SSL_get_SSL_CTX(ssl))
  65             || !TEST_ptr(store = SSL_CTX_get_cert_store(ssl_ctx))
  66             || !TEST_true(X509_STORE_CTX_init(store_ctx, store, NULL, chain))
  67             || !TEST_true(X509_STORE_CTX_set_ex_data(store_ctx, store_ctx_idx,
  68                                                      ssl)))
  69         goto end;
  70
  71     X509_STORE_CTX_set_default(store_ctx, SSL_is_server(ssl)
  72                                ? "ssl_client" : "ssl_server");
  73     X509_VERIFY_PARAM_set1(X509_STORE_CTX_get0_param(store_ctx),
  74                            SSL_get0_param(ssl));
  75     store_ctx_dane_init(store_ctx, ssl);
  76
  77     if (SSL_get_verify_callback(ssl) != NULL)
  78         X509_STORE_CTX_set_verify_cb(store_ctx, SSL_get_verify_callback(ssl));
  79
  80     /* Mask "internal failures" (-1) from our return value. */
  81     if (!TEST_int_ge(ret = X509_STORE_CTX_verify(store_ctx), 0))
  82         ret = 0;
  83
  84     SSL_set_verify_result(ssl, X509_STORE_CTX_get_error(store_ctx));
  85
  86 end:
  87     X509_STORE_CTX_free(store_ctx);
  88     return ret;
  89 }
  90
  91 static STACK_OF(X509) *load_chain(BIO *fp, int nelem)
  92 {
  93     int count;
  94     char *name = 0;
  95     char *header = 0;
  96     unsigned char *data = 0;
  97     long len;
  98     char *errtype = 0; /* if error: cert or pkey? */
  99     STACK_OF(X509) *chain;
 100     typedef X509 *(*d2i_X509_t)(X509 **, const unsigned char **, long);
 101
 102     if (!TEST_ptr(chain = sk_X509_new_null()))
 103         goto err;
 104
 105     for (count = 0;
 106          count < nelem && errtype == 0
 107          && PEM_read_bio(fp, &name, &header, &data, &len) == 1;
 108          ++count) {
 109         if (strcmp(name, PEM_STRING_X509) == 0
 110                 || strcmp(name, PEM_STRING_X509_TRUSTED) == 0
 111                 || strcmp(name, PEM_STRING_X509_OLD) == 0) {
 112             d2i_X509_t d = strcmp(name, PEM_STRING_X509_TRUSTED) != 0
 113                 ? d2i_X509_AUX : d2i_X509;
 114             X509 *cert;
 115             const unsigned char *p = data;
 116
 117             if (!TEST_ptr(cert = d(0, &p, len))
 118                     || !TEST_long_eq(p - data, len)) {
 119                 TEST_info("Certificate parsing error");
 120                 goto err;
 121             }
 122
 123             if (!TEST_true(sk_X509_push(chain, cert)))
 124                 goto err;
 125         } else {
 126             TEST_info("Unknown chain file object %s", name);
 127             goto err;
 128         }
 129
 130         OPENSSL_free(name);
 131         OPENSSL_free(header);
 132         OPENSSL_free(data);
 133         name = header = NULL;
 134         data = NULL;
 135     }
 136
 137     if (count == nelem) {
 138         ERR_clear_error();
 139         return chain;
 140     }
 141
 142 err:
 143     OPENSSL_free(name);
 144     OPENSSL_free(header);
 145     OPENSSL_free(data);
 146     OSSL_STACK_OF_X509_free(chain);
 147     return NULL;
 148 }
 149
 150 static char *read_to_eol(BIO *f)
 151 {
 152     static char buf[4096];
 153     int n;
 154
 155     if (BIO_gets(f, buf, sizeof(buf)) <= 0)
 156         return NULL;
 157
 158     n = strlen(buf);
 159     if (buf[n - 1] != '\n') {
 160         if (n + 1 == sizeof(buf))
 161             TEST_error("input too long");
 162         else
 163             TEST_error("EOF before newline");
 164         return NULL;
 165     }
 166
 167     /* Trim trailing whitespace */
 168     while (n > 0 && isspace(_UC(buf[n - 1])))
 169         buf[--n] = '\0';
 170
 171     return buf;
 172 }
 173
 174 /*
 175  * Hex decoder that tolerates optional whitespace
 176  */
 177 static ossl_ssize_t hexdecode(const char *in, void *result)
 178 {
 179     unsigned char **out = (unsigned char **)result;
 180     unsigned char *ret;
 181     unsigned char *cp;
 182     uint8_t byte;
 183     int nibble = 0;
 184
 185     if (!TEST_ptr(ret = OPENSSL_malloc(strlen(in) / 2)))
 186         return -1;
 187     cp = ret;
 188
 189     for (byte = 0; *in; ++in) {
 190         int x;
 191
 192         if (isspace(_UC(*in)))
 193             continue;
 194         x = OPENSSL_hexchar2int(*in);
 195         if (x < 0) {
 196             OPENSSL_free(ret);
 197             return 0;
 198         }
 199         byte |= (char)x;
 200         if ((nibble ^= 1) == 0) {
 201             *cp++ = byte;
 202             byte = 0;
 203         } else {
 204             byte <<= 4;
 205         }
 206     }
 207     if (nibble != 0) {
 208         OPENSSL_free(ret);
 209         return 0;
 210     }
 211
 212     return cp - (*out = ret);
 213 }
 214
 215 static ossl_ssize_t checked_uint8(const char *in, void *out)
 216 {
 217     uint8_t *result = (uint8_t *)out;
 218     const char *cp = in;
 219     char *endp;
 220     long v;
 221     int e;
 222
 223     save_errno();
 224     v = strtol(cp, &endp, 10);
 225     e = restore_errno();
 226
 227     if (((v == LONG_MIN || v == LONG_MAX) && e == ERANGE) ||
 228         endp == cp || !isspace(_UC(*endp)) ||
 229         v != (*(uint8_t *)result = (uint8_t) v)) {
 230         return -1;
 231     }
 232     for (cp = endp; isspace(_UC(*cp)); ++cp)
 233         continue;
 234     return cp - in;
 235 }
 236
 237 struct tlsa_field {
 238     void *var;
 239     const char *name;
 240     ossl_ssize_t (*parser)(const char *, void *);
 241 };
 242
 243 static int tlsa_import_rr(SSL *ssl, const char *rrdata)
 244 {
 245     static uint8_t usage;
 246     static uint8_t selector;
 247     static uint8_t mtype;
 248     static unsigned char *data = NULL;
 249     static struct tlsa_field tlsa_fields[] = {
 250         { &usage, "usage", checked_uint8 },
 251         { &selector, "selector", checked_uint8 },
 252         { &mtype, "mtype", checked_uint8 },
 253         { &data, "data", hexdecode },
 254         { NULL, }
 255     };
 256     int ret;
 257     struct tlsa_field *f;
 258     const char *cp = rrdata;
 259     ossl_ssize_t len = 0;
 260
 261     for (f = tlsa_fields; f->var; ++f) {
 262         if ((len = f->parser(cp += len, f->var)) <= 0) {
 263             TEST_info("bad TLSA %s field in: %s", f->name, rrdata);
 264             return 0;
 265         }
 266     }
 267
 268     ret = SSL_dane_tlsa_add(ssl, usage, selector, mtype, data, len);
 269     OPENSSL_free(data);
 270     if (ret == 0) {
 271         TEST_info("unusable TLSA rrdata: %s", rrdata);
 272         return 0;
 273     }
 274     if (ret < 0) {
 275         TEST_info("error loading TLSA rrdata: %s", rrdata);
 276         return 0;
 277     }
 278
 279     return ret;
 280 }
 281
 282 static int allws(const char *cp)
 283 {
 284     while (*cp)
 285         if (!isspace(_UC(*cp++)))
 286             return 0;
 287     return 1;
 288 }
 289
 290 static int test_tlsafile(SSL_CTX *ctx, const char *base_name,
 291                          BIO *f, const char *path)
 292 {
 293     char *line;
 294     int testno = 0;
 295     int ret = 1;
 296     SSL *ssl;
 297
 298     while (ret > 0 && (line = read_to_eol(f)) != NULL) {
 299         STACK_OF(X509) *chain;
 300         int ntlsa;
 301         int ncert;
 302         int noncheck;
 303         int want;
 304         int want_depth;
 305         int off;
 306         int i;
 307         int ok;
 308         int err;
 309         int mdpth;
 310
 311         if (*line == '\0' || *line == '#')
 312             continue;
 313
 314         ++testno;
 315         if (sscanf(line, "%d %d %d %d %d%n",
 316                    &ntlsa, &ncert, &noncheck, &want, &want_depth, &off) != 5
 317             || !allws(line + off)) {
 318             TEST_error("Malformed line for test %d", testno);
 319             return 0;
 320         }
 321
 322         if (!TEST_ptr(ssl = SSL_new(ctx)))
 323             return 0;
 324         SSL_set_connect_state(ssl);
 325         if (SSL_dane_enable(ssl, base_name) <= 0) {
 326             SSL_free(ssl);
 327             return 0;
 328         }
 329         if (noncheck)
 330             SSL_dane_set_flags(ssl, DANE_FLAG_NO_DANE_EE_NAMECHECKS);
 331
 332         for (i = 0; i < ntlsa; ++i) {
 333             if ((line = read_to_eol(f)) == NULL || !tlsa_import_rr(ssl, line)) {
 334                 SSL_free(ssl);
 335                 return 0;
 336             }
 337         }
 338
 339         /* Don't report old news */
 340         ERR_clear_error();
 341         if (!TEST_ptr(chain = load_chain(f, ncert))) {
 342             SSL_free(ssl);
 343             return 0;
 344         }
 345
 346         ok = verify_chain(ssl, chain);
 347         OSSL_STACK_OF_X509_free(chain);
 348         err = SSL_get_verify_result(ssl);
 349         /*
 350          * Peek under the hood, normally TLSA match data is hidden when
 351          * verification fails, we can obtain any suppressed data by setting the
 352          * verification result to X509_V_OK before looking.
 353          */
 354         SSL_set_verify_result(ssl, X509_V_OK);
 355         mdpth = SSL_get0_dane_authority(ssl, NULL, NULL);
 356         /* Not needed any more, but lead by example and put the error back. */
 357         SSL_set_verify_result(ssl, err);
 358         SSL_free(ssl);
 359
 360         if (!TEST_int_eq(err, want)) {
 361             if (want == X509_V_OK)
 362                 TEST_info("Verification failure in test %d: %d=%s",
 363                           testno, err, X509_verify_cert_error_string(err));
 364             else
 365                 TEST_info("Unexpected error in test %d", testno);
 366             ret = 0;
 367             continue;
 368         }
 369         if (!TEST_false(want == 0 && ok == 0)) {
 370             TEST_info("Verification failure in test %d: ok=0", testno);
 371             ret = 0;
 372             continue;
 373         }
 374         if (!TEST_int_eq(mdpth, want_depth)) {
 375             TEST_info("In test test %d", testno);
 376             ret = 0;
 377         }
 378     }
 379     ERR_clear_error();
 380
 381     return ret;
 382 }
 383
 384 static int run_tlsatest(void)
 385 {
 386     SSL_CTX *ctx = NULL;
 387     BIO *f = NULL;
 388     int ret = 0;
 389
 390     if (!TEST_ptr(f = BIO_new_file(tlsafile, "r"))
 391             || !TEST_ptr(ctx = SSL_CTX_new(TLS_client_method()))
 392             || !TEST_int_gt(SSL_CTX_dane_enable(ctx), 0)
 393             || !TEST_true(SSL_CTX_load_verify_file(ctx, CAfile))
 394             || !TEST_int_gt(SSL_CTX_dane_mtype_set(ctx, EVP_sha512(), 2, 1), 0)
 395             || !TEST_int_gt(SSL_CTX_dane_mtype_set(ctx, EVP_sha256(), 1, 2), 0)
 396             || !TEST_int_gt(test_tlsafile(ctx, basedomain, f, tlsafile), 0))
 397         goto end;
 398     ret = 1;
 399
 400 end:
 401     BIO_free(f);
 402     SSL_CTX_free(ctx);
 403
 404     return ret;
 405 }
 406
 407 OPT_TEST_DECLARE_USAGE("basedomain CAfile tlsafile\n")
 408
 409 int setup_tests(void)
 410 {
 411     if (!test_skip_common_options()) {
 412         TEST_error("Error parsing test options\n");
 413         return 0;
 414     }
 415
 416     if (!TEST_ptr(basedomain = test_get_argument(0))
 417             || !TEST_ptr(CAfile = test_get_argument(1))
 418             || !TEST_ptr(tlsafile = test_get_argument(2)))
 419         return 0;
 420
 421     ADD_TEST(run_tlsatest);
 422     return 1;
 423 }
 424
 425 #include "internal/dane.h"
 426
 427 static void store_ctx_dane_init(X509_STORE_CTX *store_ctx, SSL *ssl)
 428 {
 429     X509_STORE_CTX_set0_dane(store_ctx, SSL_get0_dane(ssl));
 430 }