190 строки
6.8 KiB
C
190 строки
6.8 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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#include "curlcheck.h"
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#include "doh.h" /* from the lib dir */
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static CURLcode unit_setup(void)
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{
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/* whatever you want done first */
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return CURLE_OK;
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}
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static void unit_stop(void)
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{
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/* done before shutting down and exiting */
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}
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#ifndef CURL_DISABLE_DOH
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UNITTEST_START
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/*
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* Prove detection of write overflow using a short buffer and a name
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* of maximal valid length.
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*
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* Prove detection of other invalid input.
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*/
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do {
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const char *max =
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/* ..|....1.........2.........3.........4.........5.........6... */
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/* 3456789012345678901234567890123456789012345678901234567890123 */
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"this.is.a.maximum-length.hostname." /* 34: 34 */
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"with-no-label-of-greater-length-than-the-sixty-three-characters."
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/* 64: 98 */
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"specified.in.the.RFCs." /* 22: 120 */
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"and.with.a.QNAME.encoding.whose.length.is.exactly." /* 50: 170 */
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"the.maximum.length.allowed." /* 27: 197 */
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"that.is.two-hundred.and.fifty-six." /* 34: 231 */
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"including.the.last.null." /* 24: 255 */
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"";
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const char *toolong =
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/* ..|....1.........2.........3.........4.........5.........6... */
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/* 3456789012345678901234567890123456789012345678901234567890123 */
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"here.is.a.hostname.which.is.just.barely.too.long." /* 49: 49 */
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"to.be.encoded.as.a.QNAME.of.the.maximum.allowed.length."
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/* 55: 104 */
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"which.is.256.including.a.final.zero-length.label." /* 49: 153 */
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"representing.the.root.node.so.that.a.name.with." /* 47: 200 */
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"a.trailing.dot.may.have.up.to." /* 30: 230 */
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"255.characters.never.more." /* 26: 256 */
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"";
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const char *emptylabel =
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"this.is.an.otherwise-valid.hostname."
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".with.an.empty.label.";
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const char *outsizelabel =
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"this.is.an.otherwise-valid.hostname."
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"with-a-label-of-greater-length-than-the-sixty-three-characters-"
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"specified.in.the.RFCs.";
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struct test {
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const char *name;
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const DOHcode expected_result;
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};
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/* plays the role of struct dnsprobe in urldata.h */
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struct demo {
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unsigned char dohbuffer[255 + 16]; /* deliberately short buffer */
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unsigned char canary1;
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unsigned char canary2;
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unsigned char canary3;
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};
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const struct test playlist[4] = {
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{ toolong, DOH_DNS_NAME_TOO_LONG }, /* expect early failure */
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{ emptylabel, DOH_DNS_BAD_LABEL }, /* also */
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{ outsizelabel, DOH_DNS_BAD_LABEL }, /* also */
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{ max, DOH_OK } /* expect buffer overwrite */
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};
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for(int i = 0; i < (int)(sizeof(playlist)/sizeof(*playlist)); i++) {
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const char *name = playlist[i].name;
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size_t olen = 100000;
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struct demo victim;
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DOHcode d;
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victim.canary1 = 87; /* magic numbers, arbritrarily picked */
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victim.canary2 = 35;
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victim.canary3 = 41;
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d = doh_encode(name, DNS_TYPE_A, victim.dohbuffer,
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sizeof(struct demo), /* allow room for overflow */
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&olen);
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fail_unless(d == playlist[i].expected_result,
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"result returned was not as expected");
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if(d == playlist[i].expected_result) {
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if(name == max) {
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fail_if(victim.canary1 == 87,
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"demo one-byte buffer overwrite did not happen");
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}
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else {
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fail_unless(victim.canary1 == 87,
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"one-byte buffer overwrite has happened");
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}
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fail_unless(victim.canary2 == 35,
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"two-byte buffer overwrite has happened");
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fail_unless(victim.canary3 == 41,
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"three-byte buffer overwrite has happened");
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}
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else {
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if(d == DOH_OK) {
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fail_unless(olen <= sizeof(victim.dohbuffer), "wrote outside bounds");
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fail_unless(olen > strlen(name), "unrealistic low size");
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}
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}
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}
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} while(0);
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/* run normal cases and try to trigger buffer length related errors */
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do {
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DNStype dnstype = DNS_TYPE_A;
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unsigned char buffer[128];
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const size_t buflen = sizeof(buffer);
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const size_t magic1 = 9765;
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size_t olen1 = magic1;
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const char *sunshine1 = "a.com";
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const char *dotshine1 = "a.com.";
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const char *sunshine2 = "aa.com";
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size_t olen2;
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DOHcode ret2;
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size_t olen;
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DOHcode ret = doh_encode(sunshine1, dnstype, buffer, buflen, &olen1);
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fail_unless(ret == DOH_OK, "sunshine case 1 should pass fine");
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fail_if(olen1 == magic1, "olen has not been assigned properly");
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fail_unless(olen1 > strlen(sunshine1), "bad out length");
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/* with a trailing dot, the response should have the same length */
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olen2 = magic1;
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ret2 = doh_encode(dotshine1, dnstype, buffer, buflen, &olen2);
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fail_unless(ret2 == DOH_OK, "dotshine case should pass fine");
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fail_if(olen2 == magic1, "olen has not been assigned properly");
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fail_unless(olen1 == olen2, "olen should not grow for a trailing dot");
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/* add one letter, the response should be one longer */
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olen2 = magic1;
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ret2 = doh_encode(sunshine2, dnstype, buffer, buflen, &olen2);
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fail_unless(ret2 == DOH_OK, "sunshine case 2 should pass fine");
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fail_if(olen2 == magic1, "olen has not been assigned properly");
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fail_unless(olen1 + 1 == olen2, "olen should grow with the hostname");
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/* pass a short buffer, should fail */
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ret = doh_encode(sunshine1, dnstype, buffer, olen1 - 1, &olen);
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fail_if(ret == DOH_OK, "short buffer should have been noticed");
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/* pass a minimum buffer, should succeed */
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ret = doh_encode(sunshine1, dnstype, buffer, olen1, &olen);
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fail_unless(ret == DOH_OK, "minimal length buffer should be long enough");
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fail_unless(olen == olen1, "bad buffer length");
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} while(0);
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UNITTEST_STOP
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#else /* CURL_DISABLE_DOH */
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UNITTEST_START
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{
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return 1; /* nothing to do, just fail */
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}
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UNITTEST_STOP
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#endif
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