/*
 * Copyright 2022-2023 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License"). You may not use
 * this file except in compliance with the License. You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <openssl/crypto.h>
#include <string.h>

#include "crypto/punycode.h"
#include "internal/nelem.h"
#include "internal/packet.h"
#include "testutil.h"


static const struct puny_test {
 unsigned int raw[50];
 const char *encoded;
} puny_cases[] = {
 { /* Test of 4 byte codepoint using smileyface emoji */
 { 0x1F600
 },
 "e28h"
 },
 /* Test cases from RFC 3492 */
 { /* Arabic (Egyptian) */
 { 0x0644, 0x064A, 0x0647, 0x0645, 0x0627, 0x0628, 0x062A, 0x0643, 0x0644,
 0x0645, 0x0648, 0x0634, 0x0639, 0x0631, 0x0628, 0x064A, 0x061F
 },
 "egbpdaj6bu4bxfgehfvwxn"
 },
 { /* Chinese (simplified) */
 { 0x4ED6, 0x4EEC, 0x4E3A, 0x4EC0, 0x4E48, 0x4E0D, 0x8BF4, 0x4E2D, 0x6587
 },
 "ihqwcrb4cv8a8dqg056pqjye"
 },
 { /* Chinese (traditional) */
 { 0x4ED6, 0x5011, 0x7232, 0x4EC0, 0x9EBD, 0x4E0D, 0x8AAA, 0x4E2D, 0x6587
 },
 "ihqwctvzc91f659drss3x8bo0yb"
 },
 { /* Czech: Pro<ccaron>prost<ecaron>nemluv<iacute><ccaron>esky */
 { 0x0050, 0x0072, 0x006F, 0x010D, 0x0070, 0x0072, 0x006F, 0x0073, 0x0074,
 0x011B, 0x006E, 0x0065, 0x006D, 0x006C, 0x0075, 0x0076, 0x00ED, 0x010D,
 0x0065, 0x0073, 0x006B, 0x0079
 },
 "Proprostnemluvesky-uyb24dma41a"
 },
 { /* Hebrew */
 { 0x05DC, 0x05DE, 0x05D4, 0x05D4, 0x05DD, 0x05E4, 0x05E9, 0x05D5, 0x05D8,
 0x05DC, 0x05D0, 0x05DE, 0x05D3, 0x05D1, 0x05E8, 0x05D9, 0x05DD, 0x05E2,
 0x05D1, 0x05E8, 0x05D9, 0x05EA
 },
 "4dbcagdahymbxekheh6e0a7fei0b"
 },
 { /* Hindi (Devanagari) */
 { 0x092F, 0x0939, 0x0932, 0x094B, 0x0917, 0x0939, 0x093F, 0x0928, 0x094D,
 0x0926, 0x0940, 0x0915, 0x094D, 0x092F, 0x094B, 0x0902, 0x0928, 0x0939,
 0x0940, 0x0902, 0x092C, 0x094B, 0x0932, 0x0938, 0x0915, 0x0924, 0x0947,
 0x0939, 0x0948, 0x0902
 },
 "i1baa7eci9glrd9b2ae1bj0hfcgg6iyaf8o0a1dig0cd"
 },
 { /* Japanese (kanji and hiragana) */
 { 0x306A, 0x305C, 0x307F, 0x3093, 0x306A, 0x65E5, 0x672C, 0x8A9E, 0x3092,
 0x8A71, 0x3057, 0x3066, 0x304F, 0x308C, 0x306A, 0x3044, 0x306E, 0x304B
 },
 "n8jok5ay5dzabd5bym9f0cm5685rrjetr6pdxa"
 },
 { /* Korean (Hangul syllables) */
 { 0xC138, 0xACC4, 0xC758, 0xBAA8, 0xB4E0, 0xC0AC, 0xB78C, 0xB4E4, 0xC774,
 0xD55C, 0xAD6D, 0xC5B4, 0xB97C, 0xC774, 0xD574, 0xD55C, 0xB2E4, 0xBA74,
 0xC5BC, 0xB9C8, 0xB098, 0xC88B, 0xC744, 0xAE4C
 },
 "989aomsvi5e83db1d2a355cv1e0vak1dwrv93d5xbh15a0dt30a5jpsd879ccm6fea98c"
 },
 { /* Russian (Cyrillic) */
 { 0x043F, 0x043E, 0x0447, 0x0435, 0x043C, 0x0443, 0x0436, 0x0435, 0x043E,
 0x043D, 0x0438, 0x043D, 0x0435, 0x0433, 0x043E, 0x0432, 0x043E, 0x0440,
 0x044F, 0x0442, 0x043F, 0x043E, 0x0440, 0x0443, 0x0441, 0x0441, 0x043A,
 0x0438
 },
 "b1abfaaepdrnnbgefbaDotcwatmq2g4l"
 },
 { /* Spanish */
 { 0x0050, 0x006F, 0x0072, 0x0071, 0x0075, 0x00E9, 0x006E, 0x006F, 0x0070,
 0x0075, 0x0065, 0x0064, 0x0065, 0x006E, 0x0073, 0x0069, 0x006D, 0x0070,
 0x006C, 0x0065, 0x006D, 0x0065, 0x006E, 0x0074, 0x0065, 0x0068, 0x0061,
 0x0062, 0x006C, 0x0061, 0x0072, 0x0065, 0x006E, 0x0045, 0x0073, 0x0070,
 0x0061, 0x00F1, 0x006F, 0x006C
 },
 "PorqunopuedensimplementehablarenEspaol-fmd56a"
 },
 { /* Vietnamese */
 { 0x0054, 0x1EA1, 0x0069, 0x0073, 0x0061, 0x006F, 0x0068, 0x1ECD, 0x006B,
 0x0068, 0x00F4, 0x006E, 0x0067, 0x0074, 0x0068, 0x1EC3, 0x0063, 0x0068,
 0x1EC9, 0x006E, 0x00F3, 0x0069, 0x0074, 0x0069, 0x1EBF, 0x006E, 0x0067,
 0x0056, 0x0069, 0x1EC7, 0x0074
 },
 "TisaohkhngthchnitingVit-kjcr8268qyxafd2f1b9g"
 },
 { /* Japanese: 3<nen>B<gumi><kinpachi><sensei> */
 { 0x0033, 0x5E74, 0x0042, 0x7D44, 0x91D1, 0x516B, 0x5148, 0x751F
 },
 "3B-ww4c5e180e575a65lsy2b"
 },
 { /* Japanese: <amuro><namie>-with-SUPER-MONKEYS */
 { 0x5B89, 0x5BA4, 0x5948, 0x7F8E, 0x6075, 0x002D, 0x0077, 0x0069, 0x0074,
 0x0068, 0x002D, 0x0053, 0x0055, 0x0050, 0x0045, 0x0052, 0x002D, 0x004D,
 0x004F, 0x004E, 0x004B, 0x0045, 0x0059, 0x0053
 },
 "-with-SUPER-MONKEYS-pc58ag80a8qai00g7n9n"
 },
 { /* Japanese: Hello-Another-Way-<sorezore><no><basho> */
 { 0x0048, 0x0065, 0x006C, 0x006C, 0x006F, 0x002D, 0x0041, 0x006E, 0x006F,
 0x0074, 0x0068, 0x0065, 0x0072, 0x002D, 0x0057, 0x0061, 0x0079, 0x002D,
 0x305D, 0x308C, 0x305E, 0x308C, 0x306E, 0x5834, 0x6240
 },
 "Hello-Another-Way--fc4qua05auwb3674vfr0b"
 },
 { /* Japanese: <hitotsu><yane><no><shita>2 */
 { 0x3072, 0x3068, 0x3064, 0x5C4B, 0x6839, 0x306E, 0x4E0B, 0x0032
 },
 "2-u9tlzr9756bt3uc0v"
 },
 { /* Japanese: Maji<de>Koi<suru>5<byou><mae> */
 { 0x004D, 0x0061, 0x006A, 0x0069, 0x3067, 0x004B, 0x006F, 0x0069, 0x3059,
 0x308B, 0x0035, 0x79D2, 0x524D
 },
 "MajiKoi5-783gue6qz075azm5e"
 },
 { /* Japanese: <pafii>de<runba> */
 { 0x30D1, 0x30D5, 0x30A3, 0x30FC, 0x0064, 0x0065, 0x30EB, 0x30F3, 0x30D0
 },
 "de-jg4avhby1noc0d"
 },
 { /* Japanese: <sono><supiido><de> */
 { 0x305D, 0x306E, 0x30B9, 0x30D4, 0x30FC, 0x30C9, 0x3067
 },
 "d9juau41awczczp"
 },
 { /* -> 1ドル.00 <- */
 { 0x002D, 0x003E, 0x0020, 0x0024, 0x0031, 0x002E, 0x0030, 0x0030, 0x0020,
 0x003C, 0x002D
 },
 "-> 1ドル.00 <--"
 }
};

static int test_punycode(int n)
{
 const struct puny_test *tc = puny_cases + n;
 unsigned int buffer[50];
 unsigned int bsize = OSSL_NELEM(buffer);
 size_t i;

 if (!TEST_true(ossl_punycode_decode(tc->encoded, strlen(tc->encoded),
 buffer, &bsize)))
 return 0;
 for (i = 0; i < OSSL_NELEM(tc->raw); i++)
 if (tc->raw[i] == 0)
 break;
 if (!TEST_mem_eq(buffer, bsize * sizeof(*buffer),
 tc->raw, i * sizeof(*tc->raw)))
 return 0;
 return 1;
}

static const struct bad_decode_test {
 size_t outlen;
 const char input[20];
} bad_decode_tests[] = {
 { 20, "xn--e-*" }, /* bad digit '*' */
 { 10, "xn--e-999" }, /* loop > enc_len */
 { 20, "xn--e-999999999" }, /* Too big */
 { 20, {'x', 'n', '-', '-', (char)0x80, '-' } }, /* Not basic */
 { 20, "xn--e-Oy65t" }, /* codepoint > 0x10FFFF */
};

static int test_a2ulabel_bad_decode(int tst)
{
 char out[20];

 return TEST_int_eq(ossl_a2ulabel(bad_decode_tests[tst].input, out, bad_decode_tests[tst].outlen), -1);
}

static int test_a2ulabel(void)
{
 char out[50];
 char in[530] = { 0 };

 /*
 * The punycode being passed in and parsed is malformed but we're not
 * verifying that behaviour here.
 */
 if (!TEST_int_eq(ossl_a2ulabel("xn--a.b.c", out, 1), 0)
 || !TEST_int_eq(ossl_a2ulabel("xn--a.b.c", out, 7), 1))
 return 0;
 /* Test for an off by one on the buffer size works */
 if (!TEST_int_eq(ossl_a2ulabel("xn--a.b.c", out, 6), 0)
 || !TEST_int_eq(ossl_a2ulabel("xn--a.b.c", out, 7), 1)
 || !TEST_str_eq(out,"\xc2\x80.b.c"))
 return 0;

 /* Test 4 byte smiley face */
 if (!TEST_int_eq(ossl_a2ulabel("xn--e28h.com", out, 10), 1))
 return 0;

 /* Test that we dont overflow the fixed internal buffer of 512 bytes when the starting bytes are copied */
 strcpy(in, "xn--");
 memset(in + 4, 'e', 513);
 memcpy(in + 517, "-3ya", 4);
 if (!TEST_int_eq(ossl_a2ulabel(in, out, 50), -1))
 return 0;

 return 1;
}

static int test_puny_overrun(void)
{
 static const unsigned int out[] = {
 0x0033, 0x5E74, 0x0042, 0x7D44, 0x91D1, 0x516B, 0x5148, 0x751F
 };
 static const char *in = "3B-ww4c5e180e575a65lsy2b";
 unsigned int buf[OSSL_NELEM(out)];
 unsigned int bsize = OSSL_NELEM(buf) - 1;

 if (!TEST_false(ossl_punycode_decode(in, strlen(in), buf, &bsize))) {
 if (TEST_mem_eq(buf, bsize * sizeof(*buf), out, sizeof(out)))
 TEST_error("CRITICAL: buffer overrun detected!");
 return 0;
 }
 return 1;
}

static int test_dotted_overflow(void)
{
 static const char string[] = "a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a";
 const size_t num_reps = OSSL_NELEM(string) / 2;
 WPACKET p;
 BUF_MEM *in;
 char *out = NULL;
 size_t i;
 int res = 0;

 /* Create out input punycode string */
 if (!TEST_ptr(in = BUF_MEM_new()))
 return 0;
 if (!TEST_true(WPACKET_init_len(&p, in, 0))) {
 BUF_MEM_free(in);
 return 0;
 }
 for (i = 0; i < num_reps; i++) {
 if (i > 1 && !TEST_true(WPACKET_put_bytes_u8(&p, '.')))
 goto err;
 if (!TEST_true(WPACKET_memcpy(&p, "xn--a", sizeof("xn--a") - 1)))
 goto err;
 }
 if (!TEST_true(WPACKET_put_bytes_u8(&p, '0円')))
 goto err;
 if (!TEST_ptr(out = OPENSSL_malloc(in->length)))
 goto err;

 /* Test the decode into an undersized buffer */
 memset(out, 0x7f, in->length - 1);
 if (!TEST_int_le(ossl_a2ulabel(in->data, out, num_reps), 0)
 || !TEST_int_eq(out[num_reps], 0x7f))
 goto err;

 /* Test the decode works into a full size buffer */
 if (!TEST_int_gt(ossl_a2ulabel(in->data, out, in->length), 0)
 || !TEST_size_t_eq(strlen(out), num_reps * 3))
 goto err;

 res = 1;
 err:
 WPACKET_cleanup(&p);
 BUF_MEM_free(in);
 OPENSSL_free(out);
 return res;
}

int setup_tests(void)
{
 ADD_ALL_TESTS(test_punycode, OSSL_NELEM(puny_cases));
 ADD_TEST(test_dotted_overflow);
 ADD_TEST(test_a2ulabel);
 ADD_TEST(test_puny_overrun);
 ADD_ALL_TESTS(test_a2ulabel_bad_decode, OSSL_NELEM(bad_decode_tests));
 return 1;
}