test/danetest.c

   1 /*
   2  * Copyright 2015-2017 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     X509 *cert = NULL;
  61     int ret = 0;
  62     int store_ctx_idx = SSL_get_ex_data_X509_STORE_CTX_idx();
  63
  64     if (!TEST_ptr(store_ctx = X509_STORE_CTX_new())
  65             || !TEST_ptr(ssl_ctx = SSL_get_SSL_CTX(ssl))
  66             || !TEST_ptr(store = SSL_CTX_get_cert_store(ssl_ctx))
  67             || !TEST_ptr(cert = sk_X509_value(chain, 0))
  68             || !TEST_true(X509_STORE_CTX_init(store_ctx, store, cert, chain))
  69             || !TEST_true(X509_STORE_CTX_set_ex_data(store_ctx, store_ctx_idx,
  70                                                      ssl)))
  71         goto end;
  72
  73     X509_STORE_CTX_set_default(store_ctx,
  74             SSL_is_server(ssl) ? "ssl_client" : "ssl_server");
  75     X509_VERIFY_PARAM_set1(X509_STORE_CTX_get0_param(store_ctx),
  76             SSL_get0_param(ssl));
  77     store_ctx_dane_init(store_ctx, ssl);
  78
  79     if (SSL_get_verify_callback(ssl) != NULL)
  80         X509_STORE_CTX_set_verify_cb(store_ctx, SSL_get_verify_callback(ssl));
  81
  82     /* Mask "internal failures" (-1) from our return value. */
  83     if (!TEST_int_ge(ret = X509_verify_cert(store_ctx), 0))
  84         ret = 0;
  85
  86     SSL_set_verify_result(ssl, X509_STORE_CTX_get_error(store_ctx));
  87     X509_STORE_CTX_cleanup(store_ctx);
  88
  89 end:
  90     X509_STORE_CTX_free(store_ctx);
  91     return ret;
  92 }
  93
  94 static STACK_OF(X509) *load_chain(BIO *fp, int nelem)
  95 {
  96     int count;
  97     char *name = 0;
  98     char *header = 0;
  99     unsigned char *data = 0;
 100     long len;
 101     char *errtype = 0;                /* if error: cert or pkey? */
 102     STACK_OF(X509) *chain;
 103     typedef X509 *(*d2i_X509_t)(X509 **, const unsigned char **, long);
 104
 105     if (!TEST_ptr(chain = sk_X509_new_null()))
 106         goto err;
 107
 108     for (count = 0;
 109          count < nelem && errtype == 0
 110          && PEM_read_bio(fp, &name, &header, &data, &len) == 1;
 111          ++count) {
 112         if (strcmp(name, PEM_STRING_X509) == 0
 113                     || strcmp(name, PEM_STRING_X509_TRUSTED) == 0
 114                     || strcmp(name, PEM_STRING_X509_OLD) == 0) {
 115             d2i_X509_t d = strcmp(name, PEM_STRING_X509_TRUSTED) != 0
 116                 ? d2i_X509_AUX : d2i_X509;
 117             X509 *cert;
 118             const unsigned char *p = data;
 119
 120             if (!TEST_ptr(cert = d(0, &p, len))
 121                     || !TEST_long_eq(p - data, len)) {
 122                 TEST_info("Certificate parsing error");
 123                 goto err;
 124             }
 125
 126             if (!TEST_true(sk_X509_push(chain, cert)))
 127                 goto err;
 128         } else {
 129             TEST_info("Unknown chain file object %s", name);
 130             goto err;
 131         }
 132
 133         OPENSSL_free(name);
 134         OPENSSL_free(header);
 135         OPENSSL_free(data);
 136         name = header = NULL;
 137         data = NULL;
 138     }
 139
 140     if (count == nelem) {
 141         ERR_clear_error();
 142         return chain;
 143     }
 144
 145 err:
 146     OPENSSL_free(name);
 147     OPENSSL_free(header);
 148     OPENSSL_free(data);
 149     sk_X509_pop_free(chain, X509_free);
 150     return NULL;
 151 }
 152
 153 static char *read_to_eol(BIO *f)
 154 {
 155     static char buf[1024];
 156     int n;
 157
 158     if (!BIO_gets(f, buf, sizeof(buf)))
 159         return NULL;
 160
 161     n = strlen(buf);
 162     if (buf[n - 1] != '\n') {
 163         if (n + 1 == sizeof(buf))
 164             TEST_error("input too long");
 165         else
 166             TEST_error("EOF before newline");
 167         return NULL;
 168     }
 169
 170     /* Trim trailing whitespace */
 171     while (n > 0 && isspace(_UC(buf[n - 1])))
 172         buf[--n] = '\0';
 173
 174     return buf;
 175 }
 176
 177 /*
 178  * Hex decoder that tolerates optional whitespace
 179  */
 180 static ossl_ssize_t hexdecode(const char *in, void *result)
 181 {
 182     unsigned char **out = (unsigned char **)result;
 183     unsigned char *ret;
 184     unsigned char *cp;
 185     uint8_t byte;
 186     int nibble = 0;
 187
 188     if (!TEST_ptr(ret = OPENSSL_malloc(strlen(in) / 2)))
 189         return -1;
 190     cp = ret;
 191
 192     for (byte = 0; *in; ++in) {
 193         int x;
 194
 195         if (isspace(_UC(*in)))
 196             continue;
 197         x = OPENSSL_hexchar2int(*in);
 198         if (x < 0) {
 199             OPENSSL_free(ret);
 200             return 0;
 201         }
 202         byte |= (char)x;
 203         if ((nibble ^= 1) == 0) {
 204             *cp++ = byte;
 205             byte = 0;
 206         } else {
 207             byte <<= 4;
 208         }
 209     }
 210     if (nibble != 0) {
 211         OPENSSL_free(ret);
 212         return 0;
 213     }
 214
 215     return cp - (*out = ret);
 216 }
 217
 218 static ossl_ssize_t checked_uint8(const char *in, void *out)
 219 {
 220     uint8_t *result = (uint8_t *)out;
 221     const char *cp = in;
 222     char *endp;
 223     long v;
 224     int e;
 225
 226     save_errno();
 227     v = strtol(cp, &endp, 10);
 228     e = restore_errno();
 229
 230     if (((v == LONG_MIN || v == LONG_MAX) && e == ERANGE) ||
 231         endp == cp || !isspace(_UC(*endp)) ||
 232         v != (*(uint8_t *)result = (uint8_t) v)) {
 233         return -1;
 234     }
 235     for (cp = endp; isspace(_UC(*cp)); ++cp)
 236         continue;
 237     return cp - in;
 238 }
 239
 240 struct tlsa_field {
 241     void *var;
 242     const char *name;
 243     ossl_ssize_t (*parser)(const char *, void *);
 244 };
 245
 246 static int tlsa_import_rr(SSL *ssl, const char *rrdata)
 247 {
 248     static uint8_t usage;
 249     static uint8_t selector;
 250     static uint8_t mtype;
 251     static unsigned char *data = NULL;
 252     static struct tlsa_field tlsa_fields[] = {
 253         { &usage, "usage", checked_uint8 },
 254         { &selector, "selector", checked_uint8 },
 255         { &mtype, "mtype", checked_uint8 },
 256         { &data, "data", hexdecode },
 257         { NULL, }
 258     };
 259     int ret;
 260     struct tlsa_field *f;
 261     const char *cp = rrdata;
 262     ossl_ssize_t len = 0;
 263
 264     for (f = tlsa_fields; f->var; ++f) {
 265         if ((len = f->parser(cp += len, f->var)) <= 0) {
 266             TEST_info("bad TLSA %s field in: %s", f->name, rrdata);
 267             return 0;
 268         }
 269     }
 270
 271     ret = SSL_dane_tlsa_add(ssl, usage, selector, mtype, data, len);
 272     OPENSSL_free(data);
 273     if (ret == 0) {
 274         TEST_info("unusable TLSA rrdata: %s", rrdata);
 275         return 0;
 276     }
 277     if (ret < 0) {
 278         TEST_info("error loading TLSA rrdata: %s", rrdata);
 279         return 0;
 280     }
 281
 282     return ret;
 283 }
 284
 285 static int allws(const char *cp)
 286 {
 287     while (*cp)
 288         if (!isspace(_UC(*cp++)))
 289             return 0;
 290     return 1;
 291 }
 292
 293 static int test_tlsafile(SSL_CTX *ctx, const char *base_name,
 294                          BIO *f, const char *path)
 295 {
 296     char *line;
 297     int testno = 0;
 298     int ret = 1;
 299     SSL *ssl;
 300
 301     while (ret > 0 && (line = read_to_eol(f)) != NULL) {
 302         STACK_OF(X509) *chain;
 303         int ntlsa;
 304         int ncert;
 305         int noncheck;
 306         int want;
 307         int want_depth;
 308         int off;
 309         int i;
 310         int ok;
 311         int err;
 312         int mdpth;
 313
 314         if (*line == '\0' || *line == '#')
 315             continue;
 316
 317         ++testno;
 318         if (sscanf(line, "%d %d %d %d %d%n",
 319                    &ntlsa, &ncert, &noncheck, &want, &want_depth, &off) != 5
 320             || !allws(line + off)) {
 321             TEST_error("Malformed line for test %d", testno);
 322             return 0;
 323         }
 324
 325         if (!TEST_ptr(ssl = SSL_new(ctx)))
 326             return 0;
 327         SSL_set_connect_state(ssl);
 328         if (SSL_dane_enable(ssl, base_name) <= 0) {
 329             SSL_free(ssl);
 330             return 0;
 331         }
 332         if (noncheck)
 333             SSL_dane_set_flags(ssl, DANE_FLAG_NO_DANE_EE_NAMECHECKS);
 334
 335         for (i = 0; i < ntlsa; ++i) {
 336             if ((line = read_to_eol(f)) == NULL || !tlsa_import_rr(ssl, line)) {
 337                 SSL_free(ssl);
 338                 return 0;
 339             }
 340         }
 341
 342         /* Don't report old news */
 343         ERR_clear_error();
 344         if (!TEST_ptr(chain = load_chain(f, ncert))) {
 345             SSL_free(ssl);
 346             return 0;
 347         }
 348
 349         ok = verify_chain(ssl, chain);
 350         sk_X509_pop_free(chain, X509_free);
 351         err = SSL_get_verify_result(ssl);
 352         /*
 353          * Peek under the hood, normally TLSA match data is hidden when
 354          * verification fails, we can obtain any suppressed data by setting the
 355          * verification result to X509_V_OK before looking.
 356          */
 357         SSL_set_verify_result(ssl, X509_V_OK);
 358         mdpth = SSL_get0_dane_authority(ssl, NULL, NULL);
 359         /* Not needed any more, but lead by example and put the error back. */
 360         SSL_set_verify_result(ssl, err);
 361         SSL_free(ssl);
 362
 363         if (!TEST_int_eq(err, want)) {
 364             if (want == X509_V_OK)
 365                 TEST_info("Verification failure in test %d: %d=%s",
 366                           testno, err, X509_verify_cert_error_string(err));
 367             else
 368                 TEST_info("Unexpected error in test %d", testno);
 369             ret = 0;
 370             continue;
 371         }
 372         if (!TEST_false(want == 0 && ok == 0)) {
 373             TEST_info("Verification failure in test %d: ok=0", testno);
 374             ret = 0;
 375             continue;
 376         }
 377         if (!TEST_int_eq(mdpth, want_depth)) {
 378             TEST_info("In test test %d", testno);
 379             ret = 0;
 380         }
 381     }
 382     ERR_clear_error();
 383
 384     return ret;
 385 }
 386
 387 static int run_tlsatest(void)
 388 {
 389     SSL_CTX *ctx = NULL;
 390     BIO *f = NULL;
 391     int ret = 0;
 392
 393     if (!TEST_ptr(f = BIO_new_file(tlsafile, "r"))
 394             || !TEST_ptr(ctx = SSL_CTX_new(TLS_client_method()))
 395             || !TEST_int_gt(SSL_CTX_dane_enable(ctx), 0)
 396             || !TEST_true(SSL_CTX_load_verify_locations(ctx, CAfile, NULL))
 397             || !TEST_int_gt(SSL_CTX_dane_mtype_set(ctx, EVP_sha512(), 2, 1),
 398                             0)
 399             || !TEST_int_gt(SSL_CTX_dane_mtype_set(ctx, EVP_sha256(), 1, 2),
 400                             0)
 401             || !TEST_int_gt(test_tlsafile(ctx, basedomain, f, tlsafile), 0))
 402         goto end;
 403     ret = 1;
 404
 405 end:
 406     BIO_free(f);
 407     SSL_CTX_free(ctx);
 408
 409     return ret;
 410 }
 411
 412 OPT_TEST_DECLARE_USAGE("basedomain CAfile tlsafile\n")
 413
 414 int setup_tests(void)
 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 }