Annotation of embedaddon/curl/tests/unit/unit1655.c, revision 1.1
1.1 ! misho 1: /***************************************************************************
! 2: * _ _ ____ _
! 3: * Project ___| | | | _ \| |
! 4: * / __| | | | |_) | |
! 5: * | (__| |_| | _ <| |___
! 6: * \___|\___/|_| \_\_____|
! 7: *
! 8: * Copyright (C) 2019 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
! 9: *
! 10: * This software is licensed as described in the file COPYING, which
! 11: * you should have received as part of this distribution. The terms
! 12: * are also available at https://curl.haxx.se/docs/copyright.html.
! 13: *
! 14: * You may opt to use, copy, modify, merge, publish, distribute and/or sell
! 15: * copies of the Software, and permit persons to whom the Software is
! 16: * furnished to do so, under the terms of the COPYING file.
! 17: *
! 18: * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
! 19: * KIND, either express or implied.
! 20: *
! 21: ***************************************************************************/
! 22: #include "curlcheck.h"
! 23:
! 24: #include "doh.h" /* from the lib dir */
! 25:
! 26: static CURLcode unit_setup(void)
! 27: {
! 28: /* whatever you want done first */
! 29: return CURLE_OK;
! 30: }
! 31:
! 32: static void unit_stop(void)
! 33: {
! 34: /* done before shutting down and exiting */
! 35: }
! 36:
! 37: #ifndef CURL_DISABLE_DOH
! 38:
! 39: UNITTEST_START
! 40:
! 41: /*
! 42: * Prove detection of write overflow using a short buffer and a name
! 43: * of maximal valid length.
! 44: *
! 45: * Prove detection of other invalid input.
! 46: */
! 47: do {
! 48: const char *max =
! 49: /* ..|....1.........2.........3.........4.........5.........6... */
! 50: /* 3456789012345678901234567890123456789012345678901234567890123 */
! 51: "this.is.a.maximum-length.hostname." /* 34: 34 */
! 52: "with-no-label-of-greater-length-than-the-sixty-three-characters."
! 53: /* 64: 98 */
! 54: "specified.in.the.RFCs." /* 22: 120 */
! 55: "and.with.a.QNAME.encoding.whose.length.is.exactly." /* 50: 170 */
! 56: "the.maximum.length.allowed." /* 27: 197 */
! 57: "that.is.two-hundred.and.fifty-six." /* 34: 231 */
! 58: "including.the.last.null." /* 24: 255 */
! 59: "";
! 60: const char *toolong =
! 61: /* ..|....1.........2.........3.........4.........5.........6... */
! 62: /* 3456789012345678901234567890123456789012345678901234567890123 */
! 63: "here.is.a.hostname.which.is.just.barely.too.long." /* 49: 49 */
! 64: "to.be.encoded.as.a.QNAME.of.the.maximum.allowed.length."
! 65: /* 55: 104 */
! 66: "which.is.256.including.a.final.zero-length.label." /* 49: 153 */
! 67: "representing.the.root.node.so.that.a.name.with." /* 47: 200 */
! 68: "a.trailing.dot.may.have.up.to." /* 30: 230 */
! 69: "255.characters.never.more." /* 26: 256 */
! 70: "";
! 71: const char *emptylabel =
! 72: "this.is.an.otherwise-valid.hostname."
! 73: ".with.an.empty.label.";
! 74: const char *outsizelabel =
! 75: "this.is.an.otherwise-valid.hostname."
! 76: "with-a-label-of-greater-length-than-the-sixty-three-characters-"
! 77: "specified.in.the.RFCs.";
! 78: int i;
! 79:
! 80: struct test {
! 81: const char *name;
! 82: const DOHcode expected_result;
! 83: };
! 84:
! 85: /* plays the role of struct dnsprobe in urldata.h */
! 86: struct demo {
! 87: unsigned char dohbuffer[255 + 16]; /* deliberately short buffer */
! 88: unsigned char canary1;
! 89: unsigned char canary2;
! 90: unsigned char canary3;
! 91: };
! 92:
! 93: const struct test playlist[4] = {
! 94: { toolong, DOH_DNS_NAME_TOO_LONG }, /* expect early failure */
! 95: { emptylabel, DOH_DNS_BAD_LABEL }, /* also */
! 96: { outsizelabel, DOH_DNS_BAD_LABEL }, /* also */
! 97: { max, DOH_OK } /* expect buffer overwrite */
! 98: };
! 99:
! 100: for(i = 0; i < (int)(sizeof(playlist)/sizeof(*playlist)); i++) {
! 101: const char *name = playlist[i].name;
! 102: size_t olen = 100000;
! 103: struct demo victim;
! 104: DOHcode d;
! 105:
! 106: victim.canary1 = 87; /* magic numbers, arbritrarily picked */
! 107: victim.canary2 = 35;
! 108: victim.canary3 = 41;
! 109: d = doh_encode(name, DNS_TYPE_A, victim.dohbuffer,
! 110: sizeof(struct demo), /* allow room for overflow */
! 111: &olen);
! 112:
! 113: fail_unless(d == playlist[i].expected_result,
! 114: "result returned was not as expected");
! 115: if(d == playlist[i].expected_result) {
! 116: if(name == max) {
! 117: fail_if(victim.canary1 == 87,
! 118: "demo one-byte buffer overwrite did not happen");
! 119: }
! 120: else {
! 121: fail_unless(victim.canary1 == 87,
! 122: "one-byte buffer overwrite has happened");
! 123: }
! 124: fail_unless(victim.canary2 == 35,
! 125: "two-byte buffer overwrite has happened");
! 126: fail_unless(victim.canary3 == 41,
! 127: "three-byte buffer overwrite has happened");
! 128: }
! 129: else {
! 130: if(d == DOH_OK) {
! 131: fail_unless(olen <= sizeof(victim.dohbuffer), "wrote outside bounds");
! 132: fail_unless(olen > strlen(name), "unrealistic low size");
! 133: }
! 134: }
! 135: }
! 136: } while(0);
! 137:
! 138: /* run normal cases and try to trigger buffer length related errors */
! 139: do {
! 140: DNStype dnstype = DNS_TYPE_A;
! 141: unsigned char buffer[128];
! 142: const size_t buflen = sizeof(buffer);
! 143: const size_t magic1 = 9765;
! 144: size_t olen1 = magic1;
! 145: const char *sunshine1 = "a.com";
! 146: const char *dotshine1 = "a.com.";
! 147: const char *sunshine2 = "aa.com";
! 148: size_t olen2;
! 149: DOHcode ret2;
! 150: size_t olen;
! 151:
! 152: DOHcode ret = doh_encode(sunshine1, dnstype, buffer, buflen, &olen1);
! 153: fail_unless(ret == DOH_OK, "sunshine case 1 should pass fine");
! 154: fail_if(olen1 == magic1, "olen has not been assigned properly");
! 155: fail_unless(olen1 > strlen(sunshine1), "bad out length");
! 156:
! 157: /* with a trailing dot, the response should have the same length */
! 158: olen2 = magic1;
! 159: ret2 = doh_encode(dotshine1, dnstype, buffer, buflen, &olen2);
! 160: fail_unless(ret2 == DOH_OK, "dotshine case should pass fine");
! 161: fail_if(olen2 == magic1, "olen has not been assigned properly");
! 162: fail_unless(olen1 == olen2, "olen should not grow for a trailing dot");
! 163:
! 164: /* add one letter, the response should be one longer */
! 165: olen2 = magic1;
! 166: ret2 = doh_encode(sunshine2, dnstype, buffer, buflen, &olen2);
! 167: fail_unless(ret2 == DOH_OK, "sunshine case 2 should pass fine");
! 168: fail_if(olen2 == magic1, "olen has not been assigned properly");
! 169: fail_unless(olen1 + 1 == olen2, "olen should grow with the hostname");
! 170:
! 171: /* pass a short buffer, should fail */
! 172: ret = doh_encode(sunshine1, dnstype, buffer, olen1 - 1, &olen);
! 173: fail_if(ret == DOH_OK, "short buffer should have been noticed");
! 174:
! 175: /* pass a minimum buffer, should succeed */
! 176: ret = doh_encode(sunshine1, dnstype, buffer, olen1, &olen);
! 177: fail_unless(ret == DOH_OK, "minimal length buffer should be long enough");
! 178: fail_unless(olen == olen1, "bad buffer length");
! 179: } while(0);
! 180: UNITTEST_STOP
! 181:
! 182: #else /* CURL_DISABLE_DOH */
! 183:
! 184: UNITTEST_START
! 185: {
! 186: return 1; /* nothing to do, just fail */
! 187: }
! 188: UNITTEST_STOP
! 189:
! 190: #endif
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