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2944775261
coturn/src/client/ns_turn_msg.c
Shane 2944775261
Add define to disable OAuth support (#1713) 
Redoing https://github.com/coturn/coturn/pull/1664 as requested. This
adds an optional OAUTH_DISABLED define to allow for disabling OAuth
support.
2025-07-02 11:36:50 +02:00

2482 lines
71 KiB
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/*
* SPDX-License-Identifier: BSD-3-Clause
*
* https://opensource.org/license/bsd-3-clause
*
* Copyright (C) 2011, 2012, 2013 Citrix Systems
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "ns_turn_msg.h"
#include "ns_turn_msg_addr.h"
///////////// Security functions implementation from ns_turn_msg.h ///////////
#include "ns_turn_openssl.h"
#include "ns_turn_utils.h"
///////////
#include <ctype.h> // for tolower
#include <stdbool.h>
#include <stdio.h> // for fprintf, printf, stderr, snprintf
#include <stdlib.h>
#include <string.h> // for memcpy, strlen, memset, strncpy, strcmp
///////////
#define FINGERPRINT_XOR 0x5354554e
///////////
int stun_method_str(uint16_t method, char *smethod) {
int ret = 0;
const char *s = "UNKNOWN";
switch (method) {
case STUN_METHOD_BINDING:
s = "BINDING";
break;
case STUN_METHOD_ALLOCATE:
s = "ALLOCATE";
break;
case STUN_METHOD_REFRESH:
s = "REFRESH";
break;
case STUN_METHOD_SEND:
s = "SEND";
break;
case STUN_METHOD_DATA:
s = "DATA";
break;
case STUN_METHOD_CREATE_PERMISSION:
s = "CREATE_PERMISSION";
break;
case STUN_METHOD_CHANNEL_BIND:
s = "CHANNEL_BIND";
break;
case STUN_METHOD_CONNECT:
s = "CONNECT";
break;
case STUN_METHOD_CONNECTION_BIND:
s = "CONNECTION_BIND";
break;
case STUN_METHOD_CONNECTION_ATTEMPT:
s = "CONNECTION_ATTEMPT";
break;
default:
ret = -1;
};
if (smethod) {
strcpy(smethod, s);
}
return ret;
}
long turn_random_number(void) {
long ret = 0;
if (!RAND_bytes((unsigned char *)&ret, sizeof(ret)))
#if defined(WINDOWS)
ret = rand();
#else
ret = random();
#endif
return ret;
}
static void generate_random_nonce(unsigned char *nonce, size_t sz) {
if (!RAND_bytes(nonce, (int)sz)) {
for (size_t i = 0; i < sz; ++i) {
nonce[i] = (unsigned char)turn_random_number();
}
}
}
static void turn_random_tid_size(void *id) {
uint32_t *ar = (uint32_t *)id;
if (!RAND_bytes((unsigned char *)ar, 12)) {
for (size_t i = 0; i < 3; ++i) {
ar[i] = (uint32_t)turn_random_number();
}
}
}
bool stun_calculate_hmac(const uint8_t *buf, size_t len, const uint8_t *key, size_t keylen, uint8_t *hmac,
unsigned int *hmac_len, SHATYPE shatype) {
ERR_clear_error();
UNUSED_ARG(shatype);
if (shatype == SHATYPE_SHA256) {
#if !defined(OPENSSL_NO_SHA256) && defined(SHA256_DIGEST_LENGTH)
if (!HMAC(EVP_sha256(), key, (int)keylen, buf, len, hmac, hmac_len)) {
return false;
}
#else
fprintf(stderr, "SHA256 is not supported\n");
return false;
#endif
} else if (shatype == SHATYPE_SHA384) {
#if !defined(OPENSSL_NO_SHA384) && defined(SHA384_DIGEST_LENGTH)
if (!HMAC(EVP_sha384(), key, (int)keylen, buf, len, hmac, hmac_len)) {
return false;
}
#else
fprintf(stderr, "SHA384 is not supported\n");
return false;
#endif
} else if (shatype == SHATYPE_SHA512) {
#if !defined(OPENSSL_NO_SHA512) && defined(SHA512_DIGEST_LENGTH)
if (!HMAC(EVP_sha512(), key, (int)keylen, buf, len, hmac, hmac_len)) {
return false;
}
#else
fprintf(stderr, "SHA512 is not supported\n");
return false;
#endif
} else if (!HMAC(EVP_sha1(), key, (int)keylen, buf, len, hmac, hmac_len)) {
return false;
}
return true;
}
bool stun_produce_integrity_key_str(const uint8_t *uname, const uint8_t *realm, const uint8_t *upwd, hmackey_t key,
SHATYPE shatype) {
bool ret;
ERR_clear_error();
UNUSED_ARG(shatype);
size_t ulen = strlen((const char *)uname);
size_t rlen = strlen((const char *)realm);
size_t plen = strlen((const char *)upwd);
size_t sz = ulen + 1 + rlen + 1 + plen + 1 + 10;
size_t strl = ulen + 1 + rlen + 1 + plen;
uint8_t *str = (uint8_t *)malloc(sz + 1);
strncpy((char *)str, (const char *)uname, sz);
str[ulen] = ':';
strncpy((char *)str + ulen + 1, (const char *)realm, sz - ulen - 1);
str[ulen + 1 + rlen] = ':';
strncpy((char *)str + ulen + 1 + rlen + 1, (const char *)upwd, sz - ulen - 1 - rlen - 1);
str[strl] = 0;
if (shatype == SHATYPE_SHA256) {
#if !defined(OPENSSL_NO_SHA256) && defined(SHA256_DIGEST_LENGTH)
unsigned int keylen = 0;
EVP_MD_CTX *ctx = EVP_MD_CTX_new();
EVP_DigestInit(ctx, EVP_sha256());
EVP_DigestUpdate(ctx, str, strl);
EVP_DigestFinal(ctx, key, &keylen);
EVP_MD_CTX_free(ctx);
ret = true;
#else
fprintf(stderr, "SHA256 is not supported\n");
ret = false;
#endif
} else if (shatype == SHATYPE_SHA384) {
#if !defined(OPENSSL_NO_SHA384) && defined(SHA384_DIGEST_LENGTH)
unsigned int keylen = 0;
EVP_MD_CTX *ctx = EVP_MD_CTX_new();
EVP_DigestInit(ctx, EVP_sha384());
EVP_DigestUpdate(ctx, str, strl);
EVP_DigestFinal(ctx, key, &keylen);
EVP_MD_CTX_free(ctx);
ret = true;
#else
fprintf(stderr, "SHA384 is not supported\n");
ret = false;
#endif
} else if (shatype == SHATYPE_SHA512) {
#if !defined(OPENSSL_NO_SHA512) && defined(SHA512_DIGEST_LENGTH)
unsigned int keylen = 0;
EVP_MD_CTX *ctx = EVP_MD_CTX_new();
EVP_DigestInit(ctx, EVP_sha512());
EVP_DigestUpdate(ctx, str, strl);
EVP_DigestFinal(ctx, key, &keylen);
EVP_MD_CTX_free(ctx);
ret = true;
#else
fprintf(stderr, "SHA512 is not supported\n");
ret = false;
#endif
} else {
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
unsigned int keylen = 0;
EVP_MD_CTX *ctx = EVP_MD_CTX_new();
if (EVP_default_properties_is_fips_enabled(NULL)) {
EVP_default_properties_enable_fips(NULL, 0);
}
EVP_DigestInit_ex(ctx, EVP_md5(), NULL);
EVP_DigestUpdate(ctx, str, strl);
EVP_DigestFinal(ctx, key, &keylen);
EVP_MD_CTX_free(ctx);
#else // OPENSSL_VERSION_NUMBER < 0x30000000L
unsigned int keylen = 0;
EVP_MD_CTX *ctx = EVP_MD_CTX_new();
#if defined EVP_MD_CTX_FLAG_NON_FIPS_ALLOW && !defined(LIBRESSL_VERSION_NUMBER)
if (FIPS_mode()) {
EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
}
#endif
EVP_DigestInit_ex(ctx, EVP_md5(), NULL);
EVP_DigestUpdate(ctx, str, strl);
EVP_DigestFinal(ctx, key, &keylen);
EVP_MD_CTX_free(ctx);
#endif // OPENSSL_VERSION_NUMBER >= 0X30000000L
ret = true;
}
free(str);
return ret;
}
#define PWD_SALT_SIZE (8)
static void readable_string(unsigned char *orig, unsigned char *out, size_t sz) {
out[0] = '\0';
for (size_t i = 0; i < sz; ++i) {
snprintf((char *)(out + (i * 2)), 3, "%02x", (unsigned int)orig[i]);
}
out[sz * 2] = 0;
}
static void generate_enc_password(const char *pwd, char *result, const unsigned char *orig_salt) {
unsigned char salt[PWD_SALT_SIZE + 1];
if (!orig_salt) {
generate_random_nonce(salt, PWD_SALT_SIZE);
} else {
memcpy(salt, orig_salt, PWD_SALT_SIZE);
salt[PWD_SALT_SIZE] = 0;
}
unsigned char rsalt[PWD_SALT_SIZE * 2 + 1];
readable_string(salt, rsalt, PWD_SALT_SIZE);
result[0] = '$';
result[1] = '5';
result[2] = '$';
memcpy(result + 3, (char *)rsalt, PWD_SALT_SIZE + PWD_SALT_SIZE);
result[3 + PWD_SALT_SIZE + PWD_SALT_SIZE] = '$';
unsigned char *out = (unsigned char *)(result + 3 + PWD_SALT_SIZE + PWD_SALT_SIZE + 1);
{
EVP_MD_CTX *ctx = EVP_MD_CTX_new();
#if !defined(OPENSSL_NO_SHA256) && defined(SHA256_DIGEST_LENGTH)
EVP_DigestInit(ctx, EVP_sha256());
#else
EVP_DigestInit(ctx, EVP_sha1());
#endif
EVP_DigestUpdate(ctx, salt, PWD_SALT_SIZE);
EVP_DigestUpdate(ctx, pwd, strlen(pwd));
{
unsigned char hash[129];
unsigned int keylen = 0;
EVP_DigestFinal(ctx, hash, &keylen);
readable_string(hash, out, keylen);
}
EVP_MD_CTX_free(ctx);
}
}
void generate_new_enc_password(const char *pwd, char *result) { generate_enc_password(pwd, result, NULL); }
static bool encrypted_password(const char *pin, unsigned char *salt) {
static const size_t min_len = 3 + PWD_SALT_SIZE + PWD_SALT_SIZE + 1 + 32;
if (strlen(pin) >= min_len) {
if ((pin[0] == '$') && (pin[1] == '5') && (pin[2] == '$') && (pin[3 + PWD_SALT_SIZE + PWD_SALT_SIZE] == '$')) {
for (size_t i = 0; i < PWD_SALT_SIZE; ++i) {
const char *c = pin + 3 + i + i;
char sc[3];
sc[0] = c[0];
sc[1] = c[1];
sc[2] = 0;
salt[i] = (unsigned char)strtoul(sc, NULL, 16);
}
return true;
}
}
return false;
}
bool check_password_equal(const char *pin, const char *pwd) {
unsigned char salt[PWD_SALT_SIZE];
if (!encrypted_password(pwd, salt)) {
return 0 == strcmp(pin, pwd);
}
char enc_pin[257];
generate_enc_password(pin, enc_pin, salt);
return 0 == strcmp(enc_pin, pwd);
}
/////////////////////////////////////////////////////////////////
static uint32_t ns_crc32(const uint8_t *buffer, uint32_t len);
/////////////////////////////////////////////////////////////////
int stun_get_command_message_len_str(const uint8_t *buf, size_t len) {
if (len < STUN_HEADER_LENGTH) {
return -1;
}
/* Validate the size the buffer claims to be */
size_t bufLen = (size_t)(nswap16(((const uint16_t *)(buf))[1]) + STUN_HEADER_LENGTH);
if (bufLen > len) {
return -1;
}
return bufLen;
}
static bool stun_set_command_message_len_str(uint8_t *buf, int len) {
if (len < STUN_HEADER_LENGTH) {
return false;
}
((uint16_t *)buf)[1] = nswap16((uint16_t)(len - STUN_HEADER_LENGTH));
return true;
}
/////////// Low-level binary //////////////////////////////////////////////
uint16_t stun_make_type(uint16_t method) {
method = method & 0x0FFF;
return ((method & 0x000F) | ((method & 0x0070) << 1) | ((method & 0x0380) << 2) | ((method & 0x0C00) << 2));
}
uint16_t stun_get_method_str(const uint8_t *buf, size_t len) {
if (!buf || len < 2) {
return (uint16_t)-1;
}
uint16_t tt = nswap16(((const uint16_t *)buf)[0]);
return (tt & 0x000F) | ((tt & 0x00E0) >> 1) | ((tt & 0x0E00) >> 2) | ((tt & 0x3000) >> 2);
}
uint16_t stun_get_msg_type_str(const uint8_t *buf, size_t len) {
if (!buf || len < 2) {
return (uint16_t)-1;
}
return ((nswap16(((const uint16_t *)buf)[0])) & 0x3FFF);
}
bool is_channel_msg_str(const uint8_t *buf, size_t blen) {
return (buf && blen >= 4 && STUN_VALID_CHANNEL(nswap16(((const uint16_t *)buf)[0])));
}
/////////////// message types /////////////////////////////////
bool stun_is_command_message_str(const uint8_t *buf, size_t blen) {
if (buf && blen >= STUN_HEADER_LENGTH) {
if (!STUN_VALID_CHANNEL(nswap16(((const uint16_t *)buf)[0]))) {
if ((((uint8_t)buf[0]) & ((uint8_t)(0xC0))) == 0) {
if (nswap32(((const uint32_t *)(buf))[1]) == STUN_MAGIC_COOKIE) {
uint16_t len = nswap16(((const uint16_t *)(buf))[1]);
if ((len & 0x0003) == 0) {
if ((size_t)(len + STUN_HEADER_LENGTH) == blen) {
return true;
}
}
}
}
}
}
return false;
}
bool old_stun_is_command_message_str(const uint8_t *buf, size_t blen, uint32_t *cookie) {
if (buf && blen >= STUN_HEADER_LENGTH) {
if (!STUN_VALID_CHANNEL(nswap16(((const uint16_t *)buf)[0]))) {
if ((((uint8_t)buf[0]) & ((uint8_t)(0xC0))) == 0) {
if (nswap32(((const uint32_t *)(buf))[1]) != STUN_MAGIC_COOKIE) {
uint16_t len = nswap16(((const uint16_t *)(buf))[1]);
if ((len & 0x0003) == 0) {
if ((size_t)(len + STUN_HEADER_LENGTH) == blen) {
*cookie = nswap32(((const uint32_t *)(buf))[1]);
return true;
}
}
}
}
}
}
return false;
}
bool stun_is_command_message_full_check_str(const uint8_t *buf, size_t blen, int must_check_fingerprint,
int *fingerprint_present) {
if (!stun_is_command_message_str(buf, blen)) {
return false;
}
stun_attr_ref sar = stun_attr_get_first_by_type_str(buf, blen, STUN_ATTRIBUTE_FINGERPRINT);
if (!sar) {
if (fingerprint_present) {
*fingerprint_present = 0;
}
if (stun_get_method_str(buf, blen) == STUN_METHOD_BINDING) {
return true;
}
return !must_check_fingerprint;
}
if (stun_attr_get_len(sar) != 4) {
return false;
}
const uint32_t *fingerprint = (const uint32_t *)stun_attr_get_value(sar);
if (!fingerprint) {
return !must_check_fingerprint;
}
uint32_t crc32len = (uint32_t)((((const uint8_t *)fingerprint) - buf) - 4);
bool ret = (*fingerprint == nswap32(ns_crc32(buf, crc32len) ^ ((uint32_t)FINGERPRINT_XOR)));
if (ret && fingerprint_present) {
*fingerprint_present = ret;
}
return ret;
}
bool stun_is_request_str(const uint8_t *buf, size_t len) {
if (is_channel_msg_str(buf, len)) {
return false;
}
return IS_STUN_REQUEST(stun_get_msg_type_str(buf, len));
}
bool stun_is_success_response_str(const uint8_t *buf, size_t len) {
if (is_channel_msg_str(buf, len)) {
return false;
}
return IS_STUN_SUCCESS_RESP(stun_get_msg_type_str(buf, len));
}
bool stun_is_error_response_str(const uint8_t *buf, size_t len, int *err_code, uint8_t *err_msg, size_t err_msg_size) {
if (is_channel_msg_str(buf, len)) {
return false;
}
if (IS_STUN_ERR_RESP(stun_get_msg_type_str(buf, len))) {
if (err_code) {
stun_attr_ref sar = stun_attr_get_first_by_type_str(buf, len, STUN_ATTRIBUTE_ERROR_CODE);
if (sar) {
if (stun_attr_get_len(sar) >= 4) {
const uint8_t *val = (const uint8_t *)stun_attr_get_value(sar);
*err_code = (int)(val[2] * 100 + val[3]);
if (err_msg && err_msg_size > 0) {
err_msg[0] = 0;
if (stun_attr_get_len(sar) > 4) {
size_t msg_len = stun_attr_get_len(sar) - 4;
if (msg_len > (err_msg_size - 1)) {
msg_len = err_msg_size - 1;
}
memcpy(err_msg, val + 4, msg_len);
err_msg[msg_len] = 0;
}
}
}
}
}
return true;
}
return false;
}
bool stun_is_challenge_response_str(const uint8_t *buf, size_t len, int *err_code, uint8_t *err_msg,
size_t err_msg_size, uint8_t *realm, uint8_t *nonce, uint8_t *server_name,
bool *oauth) {
bool ret = stun_is_error_response_str(buf, len, err_code, err_msg, err_msg_size);
if (ret && (((*err_code) == 401) || ((*err_code) == 438))) {
stun_attr_ref sar = stun_attr_get_first_by_type_str(buf, len, STUN_ATTRIBUTE_REALM);
if (sar) {
bool found_oauth = false;
const uint8_t *value = stun_attr_get_value(sar);
if (value) {
size_t vlen = (size_t)stun_attr_get_len(sar);
vlen = min(vlen, (size_t)STUN_MAX_REALM_SIZE);
memcpy(realm, value, vlen);
realm[vlen] = 0;
{
sar = stun_attr_get_first_by_type_str(buf, len, STUN_ATTRIBUTE_THIRD_PARTY_AUTHORIZATION);
if (sar) {
value = stun_attr_get_value(sar);
if (value) {
vlen = (size_t)stun_attr_get_len(sar);
vlen = min(vlen, (size_t)STUN_MAX_SERVER_NAME_SIZE);
if (vlen > 0) {
if (server_name) {
memcpy(server_name, value, vlen);
}
found_oauth = true;
}
}
}
}
sar = stun_attr_get_first_by_type_str(buf, len, STUN_ATTRIBUTE_NONCE);
if (sar) {
value = stun_attr_get_value(sar);
if (value) {
vlen = (size_t)stun_attr_get_len(sar);
vlen = min(vlen, (size_t)STUN_MAX_NONCE_SIZE);
memcpy(nonce, value, vlen);
nonce[vlen] = 0;
if (oauth) {
*oauth = found_oauth;
}
return true;
}
}
}
}
}
return false;
}
bool stun_is_response_str(const uint8_t *buf, size_t len) {
if (is_channel_msg_str(buf, len)) {
return false;
}
if (IS_STUN_SUCCESS_RESP(stun_get_msg_type_str(buf, len))) {
return true;
}
if (IS_STUN_ERR_RESP(stun_get_msg_type_str(buf, len))) {
return true;
}
return false;
}
bool stun_is_indication_str(const uint8_t *buf, size_t len) {
if (is_channel_msg_str(buf, len)) {
return false;
}
return IS_STUN_INDICATION(stun_get_msg_type_str(buf, len));
}
uint16_t stun_make_request(uint16_t method) { return GET_STUN_REQUEST(stun_make_type(method)); }
uint16_t stun_make_indication(uint16_t method) { return GET_STUN_INDICATION(stun_make_type(method)); }
uint16_t stun_make_success_response(uint16_t method) { return GET_STUN_SUCCESS_RESP(stun_make_type(method)); }
uint16_t stun_make_error_response(uint16_t method) { return GET_STUN_ERR_RESP(stun_make_type(method)); }
//////////////// INIT ////////////////////////////////////////////
void stun_init_buffer_str(uint8_t *buf, size_t *len) {
*len = STUN_HEADER_LENGTH;
memset(buf, 0, *len);
}
void stun_init_command_str(uint16_t message_type, uint8_t *buf, size_t *len) {
stun_init_buffer_str(buf, len);
message_type &= (uint16_t)(0x3FFF);
((uint16_t *)buf)[0] = nswap16(message_type);
((uint16_t *)buf)[1] = 0;
((uint32_t *)buf)[1] = nswap32(STUN_MAGIC_COOKIE);
stun_tid_generate_in_message_str(buf, NULL);
}
void old_stun_init_command_str(uint16_t message_type, uint8_t *buf, size_t *len, uint32_t cookie) {
stun_init_buffer_str(buf, len);
message_type &= (uint16_t)(0x3FFF);
((uint16_t *)buf)[0] = nswap16(message_type);
((uint16_t *)buf)[1] = 0;
((uint32_t *)buf)[1] = nswap32(cookie);
stun_tid_generate_in_message_str(buf, NULL);
}
void stun_init_request_str(uint16_t method, uint8_t *buf, size_t *len) {
stun_init_command_str(stun_make_request(method), buf, len);
}
void stun_init_indication_str(uint16_t method, uint8_t *buf, size_t *len) {
stun_init_command_str(stun_make_indication(method), buf, len);
}
void stun_init_success_response_str(uint16_t method, uint8_t *buf, size_t *len, stun_tid *id) {
stun_init_command_str(stun_make_success_response(method), buf, len);
if (id) {
stun_tid_message_cpy(buf, id);
}
}
void old_stun_init_success_response_str(uint16_t method, uint8_t *buf, size_t *len, stun_tid *id, uint32_t cookie) {
old_stun_init_command_str(stun_make_success_response(method), buf, len, cookie);
if (id) {
stun_tid_message_cpy(buf, id);
}
}
const uint8_t *get_default_reason(int error_code) {
const char *reason = "Unknown error";
switch (error_code) {
case 300:
reason = "Try Alternate";
break;
case 400:
reason = "Bad Request";
break;
case 401:
reason = "Unauthorized";
break;
case 403:
reason = "Forbidden";
break;
case 404:
reason = "Not Found";
break;
case 420:
reason = "Unknown Attribute";
break;
case 437:
reason = "Allocation Mismatch";
break;
case 438:
reason = "Stale Nonce";
break;
case 440:
reason = "Address Family not Supported";
break;
case 441:
reason = "Wrong Credentials";
break;
case 442:
reason = "Unsupported Transport Protocol";
break;
case 443:
reason = "Peer Address Family Mismatch";
break;
case 446:
reason = "Connection Already Exists";
break;
case 447:
reason = "Connection Timeout or Failure";
break;
case 486:
reason = "Allocation Quota Reached";
break;
case 487:
reason = "Role Conflict";
break;
case 500:
reason = "Server Error";
break;
case 508:
reason = "Insufficient Capacity";
break;
default:;
};
return (const uint8_t *)reason;
}
static void stun_init_error_response_common_str(uint8_t *buf, size_t *len, uint16_t error_code, const uint8_t *reason,
stun_tid *id) {
if (!reason || !strcmp((const char *)reason, "Unknown error")) {
reason = get_default_reason(error_code);
}
uint8_t avalue[513];
avalue[0] = 0;
avalue[1] = 0;
avalue[2] = (uint8_t)(error_code / 100);
avalue[3] = (uint8_t)(error_code % 100);
strncpy((char *)(avalue + 4), (const char *)reason, sizeof(avalue) - 4);
avalue[sizeof(avalue) - 1] = 0;
int alen = 4 + (int)strlen((const char *)(avalue + 4));
//"Manual" padding for compatibility with classic old stun:
{
int rem = alen % 4;
if (rem) {
alen += (4 - rem);
}
}
stun_attr_add_str(buf, len, STUN_ATTRIBUTE_ERROR_CODE, (uint8_t *)avalue, alen);
if (id) {
stun_tid_message_cpy(buf, id);
}
}
void old_stun_init_error_response_str(uint16_t method, uint8_t *buf, size_t *len, uint16_t error_code,
const uint8_t *reason, stun_tid *id, uint32_t cookie) {
old_stun_init_command_str(stun_make_error_response(method), buf, len, cookie);
stun_init_error_response_common_str(buf, len, error_code, reason, id);
}
void stun_init_error_response_str(uint16_t method, uint8_t *buf, size_t *len, uint16_t error_code,
const uint8_t *reason, stun_tid *id) {
stun_init_command_str(stun_make_error_response(method), buf, len);
stun_init_error_response_common_str(buf, len, error_code, reason, id);
}
/////////// CHANNEL ////////////////////////////////////////////////
bool stun_init_channel_message_str(uint16_t chnumber, uint8_t *buf, size_t *len, int length, bool do_padding) {
uint16_t rlen = (uint16_t)length;
if (length < 0 || (MAX_STUN_MESSAGE_SIZE < (4 + length))) {
return false;
}
((uint16_t *)(buf))[0] = nswap16(chnumber);
((uint16_t *)(buf))[1] = nswap16((uint16_t)length);
if (do_padding && (rlen & 0x0003)) {
rlen = ((rlen >> 2) + 1) << 2;
}
*len = 4 + rlen;
return true;
}
bool stun_is_channel_message_str(const uint8_t *buf, size_t *blen, uint16_t *chnumber, bool mandatory_padding) {
uint16_t datalen_header;
uint16_t datalen_actual;
if (!blen || (*blen < 4)) {
return false;
}
uint16_t chn = nswap16(((const uint16_t *)(buf))[0]);
if (!STUN_VALID_CHANNEL(chn)) {
return false;
}
if (*blen > (uint16_t)-1) {
*blen = (uint16_t)-1;
}
datalen_actual = (uint16_t)(*blen) - 4;
datalen_header = ((const uint16_t *)buf)[1];
datalen_header = nswap16(datalen_header);
if (datalen_header > datalen_actual) {
return false;
}
if (datalen_header != datalen_actual) {
/* maybe there are padding bytes for 32-bit alignment. Mandatory for TCP. Optional for UDP */
if (datalen_actual & 0x0003) {
if (mandatory_padding) {
return false;
} else if (datalen_header == 0) {
return false;
} else {
uint16_t diff = datalen_actual - datalen_header;
if (diff > 3) {
return false;
}
}
}
}
*blen = datalen_header + 4;
if (chnumber) {
*chnumber = chn;
}
return true;
}
////////// STUN message ///////////////////////////////
static inline bool sheadof(const char *head, const char *full, bool ignore_case) {
while (*head) {
if (*head != *full) {
if (ignore_case && (tolower((int)*head) == tolower((int)*full))) {
// OK
} else {
return false;
}
}
++head;
++full;
}
return true;
}
static inline const char *findstr(const char *hay, size_t slen, const char *needle, bool ignore_case) {
const char *ret = NULL;
if (hay && slen && needle) {
size_t nlen = strlen(needle);
if (nlen <= slen) {
size_t smax = slen - nlen + 1;
const char *sp = hay;
for (size_t i = 0; i < smax; ++i) {
if (sheadof(needle, sp + i, ignore_case)) {
ret = sp + i;
break;
}
}
}
}
return ret;
}
int is_http(const char *s, size_t blen) {
if (s && blen >= 12) {
if ((strstr(s, "GET ") == s) || (strstr(s, "POST ") == s) || (strstr(s, "DELETE ") == s) ||
(strstr(s, "PUT ") == s)) {
const char *sp = findstr(s + 4, blen - 4, " HTTP/", false);
if (sp) {
sp += 6;
size_t diff_blen = sp - s;
if (diff_blen + 4 <= blen) {
sp = findstr(sp, blen - diff_blen, "\r\n\r\n", false);
if (sp) {
int ret_len = (int)(sp - s + 4);
const char *clheader = "content-length: ";
const char *cl = findstr(s, sp - s, clheader, true);
if (cl) {
unsigned long clen = strtoul(cl + strlen(clheader), NULL, 10);
if (clen > 0 && clen < (0x0FFFFFFF)) {
ret_len += (int)clen;
}
}
return ret_len;
}
}
}
}
}
return 0;
}
int stun_get_message_len_str(uint8_t *buf, size_t blen, int padding, size_t *app_len) {
if (buf && blen) {
/* STUN request/response ? */
if (buf && blen >= STUN_HEADER_LENGTH) {
if (!STUN_VALID_CHANNEL(nswap16(((const uint16_t *)buf)[0]))) {
if ((((uint8_t)buf[0]) & ((uint8_t)(0xC0))) == 0) {
if (nswap32(((const uint32_t *)(buf))[1]) == STUN_MAGIC_COOKIE) {
uint16_t len = nswap16(((const uint16_t *)(buf))[1]);
if ((len & 0x0003) == 0) {
len += STUN_HEADER_LENGTH;
if ((size_t)len <= blen) {
*app_len = (size_t)len;
return (int)len;
}
}
}
}
}
}
// HTTP request ?
{
int http_len = is_http(((char *)buf), blen);
if ((http_len > 0) && ((size_t)http_len <= blen)) {
*app_len = (size_t)http_len;
return http_len;
}
}
/* STUN channel ? */
if (blen >= 4) {
uint16_t chn = nswap16(((const uint16_t *)(buf))[0]);
if (STUN_VALID_CHANNEL(chn)) {
uint16_t bret = (4 + (nswap16(((const uint16_t *)(buf))[1])));
*app_len = bret;
if (padding && (bret & 0x0003)) {
bret = ((bret >> 2) + 1) << 2;
}
if (bret <= blen) {
return bret;
}
}
}
}
return -1;
}
////////// ALLOCATE ///////////////////////////////////
bool stun_set_allocate_request_str(uint8_t *buf, size_t *len, uint32_t lifetime, bool af4, bool af6, uint8_t transport,
bool mobile, const char *rt, int ep) {
stun_init_request_str(STUN_METHOD_ALLOCATE, buf, len);
// REQUESTED-TRANSPORT
{
uint8_t field[4];
field[0] = transport;
field[1] = 0;
field[2] = 0;
field[3] = 0;
if (!stun_attr_add_str(buf, len, STUN_ATTRIBUTE_REQUESTED_TRANSPORT, field, sizeof(field))) {
return false;
}
}
// LIFETIME
{
if (lifetime < 1) {
lifetime = STUN_DEFAULT_ALLOCATE_LIFETIME;
}
uint32_t field = nswap32(lifetime);
if (!stun_attr_add_str(buf, len, STUN_ATTRIBUTE_LIFETIME, (uint8_t *)(&field), sizeof(field))) {
return false;
}
}
// MICE
if (mobile) {
if (!stun_attr_add_str(buf, len, STUN_ATTRIBUTE_MOBILITY_TICKET, (const uint8_t *)"", 0)) {
return false;
}
}
if (ep > -1) {
uint8_t value = ep ? 0x80 : 0x00;
if (!stun_attr_add_str(buf, len, STUN_ATTRIBUTE_EVEN_PORT, (const uint8_t *)&value, 1)) {
return false;
}
}
// RESERVATION-TOKEN, EVEN-PORT and DUAL-ALLOCATION are mutually exclusive:
if (rt) {
stun_attr_add_str(buf, len, STUN_ATTRIBUTE_RESERVATION_TOKEN, (const uint8_t *)rt, 8);
} else {
// ADRESS-FAMILY
if (af4 && !af6) {
uint8_t field[4];
field[0] = (uint8_t)STUN_ATTRIBUTE_REQUESTED_ADDRESS_FAMILY_VALUE_IPV4;
field[1] = 0;
field[2] = 0;
field[3] = 0;
if (!stun_attr_add_str(buf, len, STUN_ATTRIBUTE_REQUESTED_ADDRESS_FAMILY, field, sizeof(field))) {
return false;
}
}
if (af6 && !af4) {
uint8_t field[4];
field[0] = (uint8_t)STUN_ATTRIBUTE_REQUESTED_ADDRESS_FAMILY_VALUE_IPV6;
field[1] = 0;
field[2] = 0;
field[3] = 0;
if (!stun_attr_add_str(buf, len, STUN_ATTRIBUTE_REQUESTED_ADDRESS_FAMILY, field, sizeof(field))) {
return false;
}
}
if (af4 && af6) {
uint8_t field[4];
field[0] = (uint8_t)STUN_ATTRIBUTE_REQUESTED_ADDRESS_FAMILY_VALUE_IPV6;
field[1] = 0;
field[2] = 0;
field[3] = 0;
if (!stun_attr_add_str(buf, len, STUN_ATTRIBUTE_ADDITIONAL_ADDRESS_FAMILY, field, sizeof(field))) {
return false;
}
}
}
return true;
}
bool stun_set_allocate_response_str(uint8_t *buf, size_t *len, stun_tid *tid, const ioa_addr *relayed_addr1,
const ioa_addr *relayed_addr2, const ioa_addr *reflexive_addr, uint32_t lifetime,
uint32_t max_lifetime, int error_code, const uint8_t *reason,
uint64_t reservation_token, char *mobile_id) {
if (!error_code) {
stun_init_success_response_str(STUN_METHOD_ALLOCATE, buf, len, tid);
if (relayed_addr1) {
if (!stun_attr_add_addr_str(buf, len, STUN_ATTRIBUTE_XOR_RELAYED_ADDRESS, relayed_addr1)) {
return false;
}
}
if (relayed_addr2) {
if (!stun_attr_add_addr_str(buf, len, STUN_ATTRIBUTE_XOR_RELAYED_ADDRESS, relayed_addr2)) {
return false;
}
}
if (reflexive_addr) {
if (!stun_attr_add_addr_str(buf, len, STUN_ATTRIBUTE_XOR_MAPPED_ADDRESS, reflexive_addr)) {
return false;
}
}
if (reservation_token) {
reservation_token = nswap64(reservation_token);
stun_attr_add_str(buf, len, STUN_ATTRIBUTE_RESERVATION_TOKEN, (uint8_t *)(&reservation_token), 8);
}
{
if (lifetime < 1) {
lifetime = STUN_DEFAULT_ALLOCATE_LIFETIME;
} else if (lifetime > max_lifetime) {
lifetime = max_lifetime;
}
uint32_t field = nswap32(lifetime);
if (!stun_attr_add_str(buf, len, STUN_ATTRIBUTE_LIFETIME, (uint8_t *)(&field), sizeof(field))) {
return false;
}
}
if (mobile_id && *mobile_id) {
if (!stun_attr_add_str(buf, len, STUN_ATTRIBUTE_MOBILITY_TICKET, (uint8_t *)mobile_id, (int)strlen(mobile_id))) {
return false;
}
}
} else {
stun_init_error_response_str(STUN_METHOD_ALLOCATE, buf, len, error_code, reason, tid);
}
return true;
}
/////////////// CHANNEL BIND ///////////////////////////////////////
uint16_t stun_set_channel_bind_request_str(uint8_t *buf, size_t *len, const ioa_addr *peer_addr,
uint16_t channel_number) {
if (!STUN_VALID_CHANNEL(channel_number)) {
channel_number = 0x4000 + ((uint16_t)(((uint32_t)turn_random_number()) % (0x7FFF - 0x4000 + 1)));
}
stun_init_request_str(STUN_METHOD_CHANNEL_BIND, buf, len);
if (!stun_attr_add_channel_number_str(buf, len, channel_number)) {
return 0;
}
if (!peer_addr) {
ioa_addr ca;
memset(&ca, 0, sizeof(ioa_addr));
if (!stun_attr_add_addr_str(buf, len, STUN_ATTRIBUTE_XOR_PEER_ADDRESS, &ca)) {
return 0;
}
} else {
if (!stun_attr_add_addr_str(buf, len, STUN_ATTRIBUTE_XOR_PEER_ADDRESS, peer_addr)) {
return 0;
}
}
return channel_number;
}
void stun_set_channel_bind_response_str(uint8_t *buf, size_t *len, stun_tid *tid, int error_code,
const uint8_t *reason) {
if (!error_code) {
stun_init_success_response_str(STUN_METHOD_CHANNEL_BIND, buf, len, tid);
} else {
stun_init_error_response_str(STUN_METHOD_CHANNEL_BIND, buf, len, error_code, reason, tid);
}
}
/////////////// BINDING ///////////////////////////////////////
void stun_set_binding_request_str(uint8_t *buf, size_t *len) { stun_init_request_str(STUN_METHOD_BINDING, buf, len); }
bool stun_set_binding_response_str(uint8_t *buf, size_t *len, stun_tid *tid, const ioa_addr *reflexive_addr,
int error_code, const uint8_t *reason, uint32_t cookie, bool old_stun,
bool stun_backward_compatibility)
{
if (!error_code) {
if (!old_stun) {
stun_init_success_response_str(STUN_METHOD_BINDING, buf, len, tid);
} else {
old_stun_init_success_response_str(STUN_METHOD_BINDING, buf, len, tid, cookie);
}
if (!old_stun && reflexive_addr) {
if (!stun_attr_add_addr_str(buf, len, STUN_ATTRIBUTE_XOR_MAPPED_ADDRESS, reflexive_addr)) {
return false;
}
}
if (reflexive_addr) {
if (stun_backward_compatibility &&
!stun_attr_add_addr_str(buf, len, STUN_ATTRIBUTE_MAPPED_ADDRESS, reflexive_addr)) {
return false;
}
}
} else if (!old_stun) {
stun_init_error_response_str(STUN_METHOD_BINDING, buf, len, error_code, reason, tid);
} else {
old_stun_init_error_response_str(STUN_METHOD_BINDING, buf, len, error_code, reason, tid, cookie);
}
return true;
}
bool stun_is_binding_request_str(const uint8_t *buf, size_t len, size_t offset) {
if (offset < len) {
buf += offset;
len -= offset;
if (stun_is_command_message_str(buf, len)) {
if (stun_is_request_str(buf, len) && (stun_get_method_str(buf, len) == STUN_METHOD_BINDING)) {
return true;
}
}
}
return false;
}
bool stun_is_binding_response_str(const uint8_t *buf, size_t len) {
if (stun_is_command_message_str(buf, len) && (stun_get_method_str(buf, len) == STUN_METHOD_BINDING)) {
if (stun_is_response_str(buf, len)) {
return true;
}
}
return false;
}
/////////////////////////////// TID ///////////////////////////////
bool stun_tid_equals(const stun_tid *id1, const stun_tid *id2) {
if (!id1 || !id2) {
return false;
}
if (id1 == id2) {
return true;
}
for (size_t i = 0; i < STUN_TID_SIZE; ++i) {
if (id1->tsx_id[i] != id2->tsx_id[i]) {
return false;
}
}
return true;
}
void stun_tid_cpy(stun_tid *id1, const stun_tid *id2) {
if (!id1 || !id2) {
return;
}
memcpy(id1->tsx_id, id2->tsx_id, STUN_TID_SIZE);
}
static void stun_tid_string_cpy(uint8_t *s, const stun_tid *id) {
if (s && id) {
memcpy(s, id->tsx_id, STUN_TID_SIZE);
}
}
static void stun_tid_from_string(const uint8_t *s, stun_tid *id) {
if (s && id) {
memcpy(id->tsx_id, s, STUN_TID_SIZE);
}
}
void stun_tid_from_message_str(const uint8_t *buf, size_t len, stun_tid *id) {
UNUSED_ARG(len);
stun_tid_from_string(buf + 8, id);
}
void stun_tid_message_cpy(uint8_t *buf, const stun_tid *id) {
if (buf && id) {
stun_tid_string_cpy(buf + 8, id);
}
}
void stun_tid_generate(stun_tid *id) {
if (id) {
turn_random_tid_size(id->tsx_id);
}
}
void stun_tid_generate_in_message_str(uint8_t *buf, stun_tid *id) {
stun_tid tmp;
if (!id) {
id = &tmp;
}
stun_tid_generate(id);
stun_tid_message_cpy(buf, id);
}
/////////////////// TIME ////////////////////////////////////////////////////////
turn_time_t stun_adjust_allocate_lifetime(turn_time_t lifetime, turn_time_t max_allowed_lifetime,
turn_time_t max_lifetime) {
if (!lifetime) {
lifetime = STUN_DEFAULT_ALLOCATE_LIFETIME;
} else if (lifetime < STUN_MIN_ALLOCATE_LIFETIME) {
lifetime = STUN_MIN_ALLOCATE_LIFETIME;
} else if (lifetime > max_allowed_lifetime) {
lifetime = max_allowed_lifetime;
}
if (max_lifetime && (max_lifetime < lifetime)) {
lifetime = max_lifetime;
}
return lifetime;
}
////////////// ATTR /////////////////////////////////////////////////////////////
int stun_attr_get_type(stun_attr_ref attr) {
if (attr) {
return (int)(nswap16(((const uint16_t *)attr)[0]));
}
return -1;
}
int stun_attr_get_len(stun_attr_ref attr) {
if (attr) {
return (int)(nswap16(((const uint16_t *)attr)[1]));
}
return -1;
}
const uint8_t *stun_attr_get_value(stun_attr_ref attr) {
if (attr) {
int len = (int)(nswap16(((const uint16_t *)attr)[1]));
if (len < 1) {
return NULL;
}
return ((const uint8_t *)attr) + 4;
}
return NULL;
}
int stun_get_requested_address_family(stun_attr_ref attr) {
if (attr) {
int len = (int)(nswap16(((const uint16_t *)attr)[1]));
if (len != 4) {
return STUN_ATTRIBUTE_REQUESTED_ADDRESS_FAMILY_VALUE_INVALID;
}
int val = ((const uint8_t *)attr)[4];
switch (val) {
case STUN_ATTRIBUTE_REQUESTED_ADDRESS_FAMILY_VALUE_IPV4:
case STUN_ATTRIBUTE_REQUESTED_ADDRESS_FAMILY_VALUE_IPV6:
return val;
default:
return STUN_ATTRIBUTE_REQUESTED_ADDRESS_FAMILY_VALUE_INVALID;
};
}
return STUN_ATTRIBUTE_REQUESTED_ADDRESS_FAMILY_VALUE_DEFAULT;
}
uint16_t stun_attr_get_channel_number(stun_attr_ref attr) {
if (attr) {
const uint8_t *value = stun_attr_get_value(attr);
if (value && (stun_attr_get_len(attr) >= 2)) {
uint16_t cn = nswap16(((const uint16_t *)value)[0]);
if (STUN_VALID_CHANNEL(cn)) {
return cn;
}
}
}
return 0;
}
band_limit_t stun_attr_get_bandwidth(stun_attr_ref attr) {
if (attr) {
const uint8_t *value = stun_attr_get_value(attr);
if (value && (stun_attr_get_len(attr) >= 4)) {
uint32_t bps = nswap32(((const uint32_t *)value)[0]);
return (band_limit_t)(bps << 7);
}
}
return 0;
}
uint64_t stun_attr_get_reservation_token_value(stun_attr_ref attr) {
if (attr) {
const uint8_t *value = stun_attr_get_value(attr);
if (value && (stun_attr_get_len(attr) == 8)) {
uint64_t token;
memcpy(&token, value, sizeof(uint64_t));
return nswap64(token);
}
}
return 0;
}
bool stun_attr_is_addr(stun_attr_ref attr) {
if (attr) {
switch (stun_attr_get_type(attr)) {
case STUN_ATTRIBUTE_XOR_MAPPED_ADDRESS:
case STUN_ATTRIBUTE_XOR_PEER_ADDRESS:
case STUN_ATTRIBUTE_XOR_RELAYED_ADDRESS:
case STUN_ATTRIBUTE_MAPPED_ADDRESS:
case STUN_ATTRIBUTE_ALTERNATE_SERVER:
case OLD_STUN_ATTRIBUTE_RESPONSE_ADDRESS:
case OLD_STUN_ATTRIBUTE_SOURCE_ADDRESS:
case OLD_STUN_ATTRIBUTE_CHANGED_ADDRESS:
case OLD_STUN_ATTRIBUTE_REFLECTED_FROM:
case STUN_ATTRIBUTE_RESPONSE_ORIGIN:
case STUN_ATTRIBUTE_OTHER_ADDRESS:
return true;
break;
default:;
};
}
return false;
}
uint8_t stun_attr_get_even_port(stun_attr_ref attr) {
if (attr) {
const uint8_t *value = stun_attr_get_value(attr);
if (value) {
if ((uint8_t)(value[0]) > 0x7F) {
return 1;
}
}
}
return 0;
}
stun_attr_ref stun_attr_get_first_by_type_str(const uint8_t *buf, size_t len, uint16_t attr_type) {
stun_attr_ref attr = stun_attr_get_first_str(buf, len);
while (attr) {
if (stun_attr_get_type(attr) == attr_type) {
return attr;
}
attr = stun_attr_get_next_str(buf, len, attr);
}
return NULL;
}
static stun_attr_ref stun_attr_check_valid(stun_attr_ref attr, size_t remaining) {
if (remaining >= 4) {
/* Read the size of the attribute */
size_t attrlen = stun_attr_get_len(attr);
remaining -= 4;
/* Round to boundary */
uint16_t rem4 = ((uint16_t)attrlen) & 0x0003;
if (rem4) {
attrlen = attrlen + 4 - (int)rem4;
}
/* Check that there's enough space remaining */
if (attrlen <= remaining) {
return attr;
}
}
return NULL;
}
stun_attr_ref stun_attr_get_first_str(const uint8_t *buf, size_t len) {
int bufLen = stun_get_command_message_len_str(buf, len);
if (bufLen > STUN_HEADER_LENGTH) {
stun_attr_ref attr = (stun_attr_ref)(buf + STUN_HEADER_LENGTH);
return stun_attr_check_valid(attr, bufLen - STUN_HEADER_LENGTH);
}
return NULL;
}
stun_attr_ref stun_attr_get_next_str(const uint8_t *buf, size_t len, stun_attr_ref prev) {
if (!prev) {
return stun_attr_get_first_str(buf, len);
} else {
const uint8_t *end = buf + stun_get_command_message_len_str(buf, len);
int attrlen = stun_attr_get_len(prev);
uint16_t rem4 = ((uint16_t)attrlen) & 0x0003;
if (rem4) {
attrlen = attrlen + 4 - (int)rem4;
}
/* Note the order here: operations on attrlen are untrusted as they may overflow */
if (attrlen < end - (const uint8_t *)prev - 4) {
const uint8_t *attr_end = (const uint8_t *)prev + 4 + attrlen;
return stun_attr_check_valid(attr_end, end - attr_end);
}
return NULL;
}
}
bool stun_attr_add_str(uint8_t *buf, size_t *len, uint16_t attr, const uint8_t *avalue, int alen) {
if (alen < 0) {
alen = 0;
}
uint8_t tmp[1];
if (!avalue) {
alen = 0;
avalue = tmp;
}
int clen = stun_get_command_message_len_str(buf, *len);
int newlen = clen + 4 + alen;
int newlenrem4 = newlen & 0x00000003;
int paddinglen = 0;
if (newlenrem4) {
paddinglen = 4 - newlenrem4;
newlen = newlen + paddinglen;
}
if (newlen >= MAX_STUN_MESSAGE_SIZE) {
return false;
}
uint8_t *attr_start = buf + clen;
uint16_t *attr_start_16t = (uint16_t *)attr_start;
stun_set_command_message_len_str(buf, newlen);
*len = newlen;
attr_start_16t[0] = nswap16(attr);
attr_start_16t[1] = nswap16(alen);
if (alen > 0) {
memcpy(attr_start + 4, avalue, alen);
}
// Write 0 padding to not leak data
memset(attr_start + 4 + alen, 0, paddinglen);
return true;
}
bool stun_attr_add_addr_str(uint8_t *buf, size_t *len, uint16_t attr_type, const ioa_addr *ca) {
stun_tid tid;
stun_tid_from_message_str(buf, *len, &tid);
int xor_ed = 0;
switch (attr_type) {
case STUN_ATTRIBUTE_XOR_MAPPED_ADDRESS:
case STUN_ATTRIBUTE_XOR_PEER_ADDRESS:
case STUN_ATTRIBUTE_XOR_RELAYED_ADDRESS:
xor_ed = 1;
break;
default:;
};
ioa_addr public_addr;
map_addr_from_private_to_public(ca, &public_addr);
uint8_t cfield[64];
int clen = 0;
if (stun_addr_encode(&public_addr, cfield, &clen, xor_ed, STUN_MAGIC_COOKIE, tid.tsx_id) < 0) {
return false;
}
if (!stun_attr_add_str(buf, len, attr_type, (uint8_t *)(&cfield), clen)) {
return false;
}
return true;
}
bool stun_attr_get_addr_str(const uint8_t *buf, size_t len, stun_attr_ref attr, ioa_addr *ca,
const ioa_addr *default_addr) {
stun_tid tid;
stun_tid_from_message_str(buf, len, &tid);
ioa_addr public_addr;
addr_set_any(ca);
addr_set_any(&public_addr);
int attr_type = stun_attr_get_type(attr);
if (attr_type < 0) {
return false;
}
int xor_ed = 0;
switch (attr_type) {
case STUN_ATTRIBUTE_XOR_MAPPED_ADDRESS:
case STUN_ATTRIBUTE_XOR_PEER_ADDRESS:
case STUN_ATTRIBUTE_XOR_RELAYED_ADDRESS:
xor_ed = 1;
break;
default:;
};
const uint8_t *cfield = stun_attr_get_value(attr);
if (!cfield) {
return false;
}
if (stun_addr_decode(&public_addr, cfield, stun_attr_get_len(attr), xor_ed, STUN_MAGIC_COOKIE, tid.tsx_id) < 0) {
return false;
}
map_addr_from_public_to_private(&public_addr, ca);
if (default_addr && addr_any_no_port(ca) && !addr_any_no_port(default_addr)) {
int port = addr_get_port(ca);
addr_cpy(ca, default_addr);
addr_set_port(ca, port);
}
return true;
}
bool stun_attr_get_first_addr_str(const uint8_t *buf, size_t len, uint16_t attr_type, ioa_addr *ca,
const ioa_addr *default_addr) {
stun_attr_ref attr = stun_attr_get_first_str(buf, len);
while (attr) {
if (stun_attr_is_addr(attr) && (attr_type == stun_attr_get_type(attr))) {
if (stun_attr_get_addr_str(buf, len, attr, ca, default_addr)) {
return true;
}
}
attr = stun_attr_get_next_str(buf, len, attr);
}
return false;
}
bool stun_attr_add_channel_number_str(uint8_t *buf, size_t *len, uint16_t chnumber) {
uint16_t field[2];
field[0] = nswap16(chnumber);
field[1] = 0;
return stun_attr_add_str(buf, len, STUN_ATTRIBUTE_CHANNEL_NUMBER, (uint8_t *)(field), sizeof(field));
}
bool stun_attr_add_bandwidth_str(uint8_t *buf, size_t *len, band_limit_t bps0) {
uint32_t bps = (uint32_t)(band_limit_t)(bps0 >> 7);
uint32_t field = nswap32(bps);
return stun_attr_add_str(buf, len, STUN_ATTRIBUTE_NEW_BANDWIDTH, (uint8_t *)(&field), sizeof(field));
}
bool stun_attr_add_address_error_code(uint8_t *buf, size_t *len, int requested_address_family, int error_code) {
const uint8_t *reason = get_default_reason(error_code);
uint8_t avalue[513];
avalue[0] = (uint8_t)requested_address_family;
avalue[1] = 0;
avalue[2] = (uint8_t)(error_code / 100);
avalue[3] = (uint8_t)(error_code % 100);
strncpy((char *)(avalue + 4), (const char *)reason, sizeof(avalue) - 4);
avalue[sizeof(avalue) - 1] = 0;
int alen = 4 + (int)strlen((const char *)(avalue + 4));
//"Manual" padding for compatibility with classic old stun:
{
int rem = alen % 4;
if (rem) {
alen += (4 - rem);
}
}
return stun_attr_add_str(buf, len, STUN_ATTRIBUTE_ADDRESS_ERROR_CODE, (uint8_t *)avalue, alen);
}
uint16_t stun_attr_get_first_channel_number_str(const uint8_t *buf, size_t len) {
stun_attr_ref attr = stun_attr_get_first_str(buf, len);
while (attr) {
if (stun_attr_get_type(attr) == STUN_ATTRIBUTE_CHANNEL_NUMBER) {
uint16_t ret = stun_attr_get_channel_number(attr);
if (STUN_VALID_CHANNEL(ret)) {
return ret;
}
}
attr = stun_attr_get_next_str(buf, len, attr);
}
return 0;
}
////////////// FINGERPRINT ////////////////////////////
bool stun_attr_add_fingerprint_str(uint8_t *buf, size_t *len) {
uint32_t crc32 = 0;
if (!stun_attr_add_str(buf, len, STUN_ATTRIBUTE_FINGERPRINT, (uint8_t *)&crc32, 4)) {
return false;
}
crc32 = ns_crc32(buf, (int)*len - 8);
*((uint32_t *)(buf + *len - 4)) = nswap32(crc32 ^ ((uint32_t)FINGERPRINT_XOR));
return true;
}
////////////// CRC ///////////////////////////////////////////////
#define CRC_MASK 0xFFFFFFFFUL
#define UPDATE_CRC(crc, c) crc = crctable[(uint8_t)crc ^ (uint8_t)(c)] ^ (crc >> 8)
static const uint32_t crctable[256] = {
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832,
0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0, 0xfd62f97a,
0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab,
0xb6662d3d, 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 0x6b6b51f4,
0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074,
0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525,
0x206f85b3, 0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 0xfed41b76,
0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 0x36034af6,
0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7,
0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7,
0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 0xbdbdf21c, 0xcabac28a, 0x53b39330,
0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
};
static uint32_t ns_crc32(const uint8_t *buffer, uint32_t len) {
uint32_t crc = CRC_MASK;
while (len--) {
UPDATE_CRC(crc, *buffer++);
}
return (~crc);
}
//////////// SASLprep RFC 4013 /////////////////////////////////////////
/* We support only basic ASCII table */
bool SASLprep(uint8_t *s) {
if (s) {
uint8_t *strin = s;
uint8_t *strout = s;
for (;;) {
uint8_t c = *strin;
if (!c) {
*strout = 0;
break;
}
switch (c) {
case 0xAD:
++strin;
break;
case 0xA0:
case 0x20:
*strout = 0x20;
++strout;
++strin;
break;
case 0x7F:
return false;
default:
if (c < 0x1F) {
return false;
}
if (c >= 0x80 && c <= 0x9F) {
return false;
}
*strout = c;
++strout;
++strin;
};
}
}
return true;
}
//////////////// Message Integrity ////////////////////////////
size_t get_hmackey_size(SHATYPE shatype) {
if (shatype == SHATYPE_SHA256) {
return 32;
}
if (shatype == SHATYPE_SHA384) {
return 48;
}
if (shatype == SHATYPE_SHA512) {
return 64;
}
return 16;
}
void print_bin_func(const char *name, size_t len, const void *s, const char *func) {
printf("<%s>:<%s>:len=%d:[", func, name, (int)len);
for (size_t i = 0; i < len; i++) {
printf("%02x", (int)((const uint8_t *)s)[i]);
}
printf("]\n");
}
bool stun_attr_add_integrity_str(turn_credential_type ct, uint8_t *buf, size_t *len, hmackey_t key, password_t pwd,
SHATYPE shatype) {
uint8_t hmac[MAXSHASIZE];
unsigned int shasize;
switch (shatype) {
case SHATYPE_SHA256:
shasize = SHA256SIZEBYTES;
break;
case SHATYPE_SHA384:
shasize = SHA384SIZEBYTES;
break;
case SHATYPE_SHA512:
shasize = SHA512SIZEBYTES;
break;
default:
shasize = SHA1SIZEBYTES;
};
if (!stun_attr_add_str(buf, len, STUN_ATTRIBUTE_MESSAGE_INTEGRITY, hmac, shasize)) {
return false;
}
if (ct == TURN_CREDENTIALS_SHORT_TERM) {
return stun_calculate_hmac(buf, *len - 4 - shasize, pwd, strlen((char *)pwd), buf + *len - shasize, &shasize,
shatype);
} else {
return stun_calculate_hmac(buf, *len - 4 - shasize, key, get_hmackey_size(shatype), buf + *len - shasize, &shasize,
shatype);
}
}
bool stun_attr_add_integrity_by_key_str(uint8_t *buf, size_t *len, const uint8_t *uname, const uint8_t *realm,
hmackey_t key, const uint8_t *nonce, SHATYPE shatype) {
if (!stun_attr_add_str(buf, len, STUN_ATTRIBUTE_USERNAME, uname, (int)strlen((const char *)uname))) {
return false;
}
if (!stun_attr_add_str(buf, len, STUN_ATTRIBUTE_NONCE, nonce, (int)strlen((const char *)nonce))) {
return false;
}
if (!stun_attr_add_str(buf, len, STUN_ATTRIBUTE_REALM, realm, (int)strlen((const char *)realm))) {
return false;
}
password_t p;
return stun_attr_add_integrity_str(TURN_CREDENTIALS_LONG_TERM, buf, len, key, p, shatype);
}
bool stun_attr_add_integrity_by_user_str(uint8_t *buf, size_t *len, const uint8_t *uname, const uint8_t *realm,
const uint8_t *upwd, const uint8_t *nonce, SHATYPE shatype) {
hmackey_t key;
if (!stun_produce_integrity_key_str(uname, realm, upwd, key, shatype)) {
return false;
}
return stun_attr_add_integrity_by_key_str(buf, len, uname, realm, key, nonce, shatype);
}
bool stun_attr_add_integrity_by_user_short_term_str(uint8_t *buf, size_t *len, const uint8_t *uname, password_t pwd,
SHATYPE shatype) {
if (stun_attr_add_str(buf, len, STUN_ATTRIBUTE_USERNAME, uname, (int)strlen((const char *)uname))) {
return false;
}
hmackey_t key;
return stun_attr_add_integrity_str(TURN_CREDENTIALS_SHORT_TERM, buf, len, key, pwd, shatype);
}
/*
* Return -1 if failure, 0 if the integrity is not correct, 1 if OK
*/
int stun_check_message_integrity_by_key_str(turn_credential_type ct, uint8_t *buf, size_t len, hmackey_t key,
password_t pwd, SHATYPE shatype) {
stun_attr_ref sar = stun_attr_get_first_by_type_str(buf, len, STUN_ATTRIBUTE_MESSAGE_INTEGRITY);
if (!sar) {
return -1;
}
unsigned int shasize = 0;
switch (stun_attr_get_len(sar)) {
case SHA256SIZEBYTES:
shasize = SHA256SIZEBYTES;
if (shatype != SHATYPE_SHA256) {
return -1;
}
break;
case SHA384SIZEBYTES:
shasize = SHA384SIZEBYTES;
if (shatype != SHATYPE_SHA384) {
return -1;
}
break;
case SHA512SIZEBYTES:
shasize = SHA512SIZEBYTES;
if (shatype != SHATYPE_SHA512) {
return -1;
}
break;
case SHA1SIZEBYTES:
shasize = SHA1SIZEBYTES;
if (shatype != SHATYPE_SHA1) {
return -1;
}
break;
default:
return -1;
};
int orig_len = stun_get_command_message_len_str(buf, len);
if (orig_len < 0) {
return -1;
}
int new_len = (int)((const uint8_t *)sar - buf) + 4 + shasize;
if (new_len > orig_len) {
return -1;
}
if (!stun_set_command_message_len_str(buf, new_len)) {
return -1;
}
int res = 0;
uint8_t new_hmac[MAXSHASIZE] = {0};
if (ct == TURN_CREDENTIALS_SHORT_TERM) {
if (!stun_calculate_hmac(buf, (size_t)new_len - 4 - shasize, pwd, strlen((char *)pwd), new_hmac, &shasize,
shatype)) {
res = -1;
} else {
res = 0;
}
} else {
if (!stun_calculate_hmac(buf, (size_t)new_len - 4 - shasize, key, get_hmackey_size(shatype), new_hmac, &shasize,
shatype)) {
res = -1;
} else {
res = 0;
}
}
stun_set_command_message_len_str(buf, orig_len);
if (res < 0) {
return -1;
}
const uint8_t *old_hmac = stun_attr_get_value(sar);
if (!old_hmac) {
return -1;
}
if (0 != memcmp(old_hmac, new_hmac, shasize)) {
return 0;
}
return +1;
}
/*
* Return -1 if failure, 0 if the integrity is not correct, 1 if OK
*/
int stun_check_message_integrity_str(turn_credential_type ct, uint8_t *buf, size_t len, const uint8_t *uname,
const uint8_t *realm, const uint8_t *upwd, SHATYPE shatype) {
hmackey_t key;
password_t pwd;
if (ct == TURN_CREDENTIALS_SHORT_TERM) {
strncpy((char *)pwd, (const char *)upwd, sizeof(password_t) - 1);
pwd[sizeof(password_t) - 1] = 0;
} else if (!stun_produce_integrity_key_str(uname, realm, upwd, key, shatype)) {
return -1;
}
return stun_check_message_integrity_by_key_str(ct, buf, len, key, pwd, shatype);
}
/* RFC 5780 */
bool stun_attr_get_change_request_str(stun_attr_ref attr, bool *change_ip, bool *change_port) {
if (stun_attr_get_len(attr) == 4) {
const uint8_t *value = stun_attr_get_value(attr);
if (value) {
*change_ip = (value[3] & 0x04);
*change_port = (value[3] & 0x02);
return true;
}
}
return false;
}
bool stun_attr_add_change_request_str(uint8_t *buf, size_t *len, bool change_ip, bool change_port) {
uint8_t avalue[4] = {0, 0, 0, 0};
if (change_ip) {
if (change_port) {
avalue[3] = 0x06;
} else {
avalue[3] = 0x04;
}
} else if (change_port) {
avalue[3] = 0x02;
}
return stun_attr_add_str(buf, len, STUN_ATTRIBUTE_CHANGE_REQUEST, avalue, 4);
}
int stun_attr_get_response_port_str(stun_attr_ref attr) {
if (stun_attr_get_len(attr) >= 2) {
const uint8_t *value = stun_attr_get_value(attr);
if (value) {
return nswap16(((const uint16_t *)value)[0]);
}
}
return -1;
}
bool stun_attr_add_response_port_str(uint8_t *buf, size_t *len, uint16_t port) {
uint8_t avalue[4] = {0, 0, 0, 0};
uint16_t *port_ptr = (uint16_t *)avalue;
*port_ptr = nswap16(port);
return stun_attr_add_str(buf, len, STUN_ATTRIBUTE_RESPONSE_PORT, avalue, 4);
}
int stun_attr_get_padding_len_str(stun_attr_ref attr) {
int len = stun_attr_get_len(attr);
if (len < 0) {
return -1;
}
return (uint16_t)len;
}
bool stun_attr_add_padding_str(uint8_t *buf, size_t *len, uint16_t padding_len) {
uint8_t avalue[0xFFFF];
memset(avalue, 0, padding_len);
return stun_attr_add_str(buf, len, STUN_ATTRIBUTE_PADDING, avalue, padding_len);
}
/* OAUTH */
#define OAUTH_ERROR(...) fprintf(stderr, __VA_ARGS__)
static void remove_spaces(char *s) {
char *sfns = s;
while (*sfns) {
if (*sfns != ' ') {
break;
}
++sfns;
}
if (*sfns) {
if (sfns != s) {
while (*sfns && (*sfns != ' ')) {
*s = *sfns;
++s;
++sfns;
};
*s = 0;
} else {
while (*s) {
if (*s == ' ') {
*s = 0;
break;
}
++s;
}
}
}
}
static void normalize_algorithm(char *s) {
char c = *s;
while (c) {
if (c == '_') {
*s = '-';
} else if ((c >= 'a') && (c <= 'z')) {
*s = c - 'a' + 'A';
}
++s;
c = *s;
}
}
size_t calculate_enc_key_length(ENC_ALG a);
size_t calculate_enc_key_length(ENC_ALG a) {
switch (a) {
#if !defined(TURN_NO_GCM)
case A128GCM:
return 16;
#endif
default:
break;
};
return 32;
}
size_t calculate_auth_key_length(ENC_ALG a);
size_t calculate_auth_key_length(ENC_ALG a) {
switch (a) {
#if !defined(TURN_NO_GCM)
case A256GCM:
case A128GCM:
return 0;
#endif
default:
break;
};
return 0;
}
static bool calculate_key(char *key, size_t key_size, char *new_key, size_t new_key_size);
static bool calculate_key(char *key, size_t key_size, char *new_key, size_t new_key_size) {
UNUSED_ARG(key_size);
memcpy(new_key, key, new_key_size);
return true;
}
bool convert_oauth_key_data(const oauth_key_data *oakd0, oauth_key *key, char *err_msg, size_t err_msg_size) {
#if !defined(TURN_NO_OAUTH)
if (oakd0 && key) {
oauth_key_data oakd_obj;
memcpy(&oakd_obj, oakd0, sizeof(oauth_key_data));
oauth_key_data *oakd = &oakd_obj;
if (!(oakd->ikm_key_size)) {
if (err_msg) {
snprintf(err_msg, err_msg_size, "key is not defined");
}
}
remove_spaces(oakd->kid);
remove_spaces(oakd->as_rs_alg);
normalize_algorithm(oakd->as_rs_alg);
if (!(oakd->kid[0])) {
if (err_msg) {
snprintf(err_msg, err_msg_size, "KID is not defined");
}
OAUTH_ERROR("KID is not defined\n");
return false;
}
memset(key, 0, sizeof(oauth_key));
STRCPY(key->kid, oakd->kid);
memcpy(key->ikm_key, oakd->ikm_key, sizeof(key->ikm_key));
key->ikm_key_size = oakd->ikm_key_size;
key->timestamp = oakd->timestamp;
key->lifetime = oakd->lifetime;
if (!(key->timestamp)) {
key->timestamp = OAUTH_DEFAULT_TIMESTAMP;
}
if (!(key->lifetime)) {
key->lifetime = OAUTH_DEFAULT_LIFETIME;
}
key->as_rs_alg = ENC_ALG_ERROR;
#if !defined(TURN_NO_GCM)
key->as_rs_alg = ENC_ALG_DEFAULT;
if (!strcmp(oakd->as_rs_alg, "A128GCM")) {
key->as_rs_alg = A128GCM;
key->auth_key_size = 0;
key->auth_key[0] = 0;
} else if (!strcmp(oakd->as_rs_alg, "A256GCM")) {
key->as_rs_alg = A256GCM;
key->auth_key_size = 0;
key->auth_key[0] = 0;
} else
#endif
{
if (err_msg) {
snprintf(err_msg, err_msg_size, "Wrong oAuth token encryption algorithm: %s (2)\n", oakd->as_rs_alg);
}
OAUTH_ERROR("Wrong oAuth token encryption algorithm: %s (3)\n", oakd->as_rs_alg);
return false;
}
#if !defined(TURN_NO_GCM)
key->auth_key_size = calculate_auth_key_length(key->as_rs_alg);
if (key->auth_key_size) {
if (!calculate_key(key->ikm_key, key->ikm_key_size, key->auth_key, key->auth_key_size)) {
return false;
}
}
key->as_rs_key_size = calculate_enc_key_length(key->as_rs_alg);
if (!calculate_key(key->ikm_key, key->ikm_key_size, key->as_rs_key, key->as_rs_key_size)) {
return false;
}
#endif
}
return true;
#else
OAUTH_ERROR("Oauth support not included");
return false;
#endif
}
#if !defined(TURN_NO_OAUTH)
const EVP_CIPHER *get_cipher_type(ENC_ALG enc_alg);
const EVP_CIPHER *get_cipher_type(ENC_ALG enc_alg) {
switch (enc_alg) {
#if !defined(TURN_NO_GCM)
case A128GCM:
return EVP_aes_128_gcm();
case A256GCM:
return EVP_aes_256_gcm();
#endif
default:
break;
}
OAUTH_ERROR("%s: Unsupported enc algorithm: %d\n", __FUNCTION__, (int)enc_alg);
return NULL;
}
int my_EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, const unsigned char *in, int inl);
int my_EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, const unsigned char *in, int inl) {
int cycle = 0;
int out_len = 0;
while ((out_len < inl) && (++cycle < 128)) {
int tmp_outl = 0;
unsigned char *ptr = NULL;
if (out) {
ptr = out + out_len;
}
int ret = EVP_EncryptUpdate(ctx, ptr, &tmp_outl, in + out_len, inl - out_len);
out_len += tmp_outl;
if (ret < 1) {
return ret;
}
}
*outl = out_len;
return 1;
}
int my_EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, const unsigned char *in, int inl);
int my_EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, const unsigned char *in, int inl) {
int cycle = 0;
int out_len = 0;
while ((out_len < inl) && (++cycle < 128)) {
int tmp_outl = 0;
unsigned char *ptr = NULL;
if (out) {
ptr = out + out_len;
}
int ret = EVP_DecryptUpdate(ctx, ptr, &tmp_outl, in + out_len, inl - out_len);
out_len += tmp_outl;
if (ret < 1) {
return ret;
}
}
*outl = out_len;
return 1;
}
#if !defined(TURN_NO_GCM)
static bool encode_oauth_token_gcm(const uint8_t *server_name, encoded_oauth_token *etoken, const oauth_key *key,
const oauth_token *dtoken, const uint8_t *nonce0) {
if (server_name && etoken && key && dtoken && (dtoken->enc_block.key_length <= MAXSHASIZE)) {
unsigned char orig_field[MAX_ENCODED_OAUTH_TOKEN_SIZE];
memset(orig_field, 0, sizeof(orig_field));
unsigned char nonce[OAUTH_GCM_NONCE_SIZE];
if (nonce0) {
memcpy(nonce, nonce0, sizeof(nonce));
} else {
generate_random_nonce(nonce, sizeof(nonce));
}
size_t len = 0;
*((uint16_t *)(orig_field + len)) = nswap16(OAUTH_GCM_NONCE_SIZE);
len += 2;
memcpy(orig_field + len, nonce, OAUTH_GCM_NONCE_SIZE);
len += OAUTH_GCM_NONCE_SIZE;
*((uint16_t *)(orig_field + len)) = nswap16(dtoken->enc_block.key_length);
len += 2;
memcpy(orig_field + len, dtoken->enc_block.mac_key, dtoken->enc_block.key_length);
len += dtoken->enc_block.key_length;
uint64_t ts = nswap64(dtoken->enc_block.timestamp);
memcpy((orig_field + len), &ts, sizeof(ts));
len += sizeof(ts);
*((uint32_t *)(orig_field + len)) = nswap32(dtoken->enc_block.lifetime);
len += 4;
const EVP_CIPHER *cipher = get_cipher_type(key->as_rs_alg);
if (!cipher) {
return false;
}
EVP_CIPHER_CTX *ctxp = EVP_CIPHER_CTX_new();
EVP_CIPHER_CTX_init(ctxp);
/* Initialize the encryption operation. */
if (1 != EVP_EncryptInit_ex(ctxp, cipher, NULL, NULL, NULL)) {
return -1;
}
EVP_CIPHER_CTX_set_padding(ctxp, 1);
/* Set IV length if default 12 bytes (96 bits) is not appropriate */
if (1 != EVP_CIPHER_CTX_ctrl(ctxp, EVP_CTRL_GCM_SET_IVLEN, OAUTH_GCM_NONCE_SIZE, NULL)) {
return false;
}
/* Initialize key and IV */
if (1 != EVP_EncryptInit_ex(ctxp, NULL, NULL, (const unsigned char *)key->as_rs_key, nonce)) {
return false;
}
int outl = 0;
size_t sn_len = strlen((const char *)server_name);
/* Provide any AAD data. This can be called zero or more times as
* required
*/
if (1 != my_EVP_EncryptUpdate(ctxp, NULL, &outl, server_name, (int)sn_len)) {
return false;
}
outl = 0;
unsigned char *encoded_field = (unsigned char *)etoken->token;
memcpy(encoded_field, orig_field, OAUTH_GCM_NONCE_SIZE + 2);
encoded_field += OAUTH_GCM_NONCE_SIZE + 2;
unsigned char *start_field = orig_field + OAUTH_GCM_NONCE_SIZE + 2;
len -= OAUTH_GCM_NONCE_SIZE + 2;
if (1 != my_EVP_EncryptUpdate(ctxp, encoded_field, &outl, start_field, (int)len)) {
return -1;
}
int tmp_outl = 0;
EVP_EncryptFinal_ex(ctxp, encoded_field + outl, &tmp_outl);
outl += tmp_outl;
EVP_CIPHER_CTX_ctrl(ctxp, EVP_CTRL_GCM_GET_TAG, OAUTH_GCM_TAG_SIZE, encoded_field + outl);
outl += OAUTH_GCM_TAG_SIZE;
etoken->size = 2 + OAUTH_GCM_NONCE_SIZE + outl;
EVP_CIPHER_CTX_free(ctxp);
return true;
}
return false;
}
static bool decode_oauth_token_gcm(const uint8_t *server_name, const encoded_oauth_token *etoken, const oauth_key *key,
oauth_token *dtoken) {
if (server_name && etoken && key && dtoken) {
unsigned char snl[2];
memcpy(snl, (const unsigned char *)(etoken->token), 2);
const unsigned char *csnl = snl;
uint16_t nonce_len = nswap16(*((const uint16_t *)csnl));
dtoken->enc_block.nonce_length = nonce_len;
size_t min_encoded_field_size = 2 + 4 + 8 + nonce_len + 2 + OAUTH_GCM_TAG_SIZE + 1;
if (etoken->size < min_encoded_field_size) {
OAUTH_ERROR("%s: token size too small: %d\n", __FUNCTION__, (int)etoken->size);
return false;
}
const unsigned char *encoded_field = (const unsigned char *)(etoken->token + nonce_len + 2);
unsigned int encoded_field_size = (unsigned int)etoken->size - nonce_len - 2 - OAUTH_GCM_TAG_SIZE;
const unsigned char *nonce = ((const unsigned char *)etoken->token + 2);
memcpy(dtoken->enc_block.nonce, nonce, nonce_len);
unsigned char tag[OAUTH_GCM_TAG_SIZE];
memcpy(tag, ((const unsigned char *)etoken->token) + nonce_len + 2 + encoded_field_size, sizeof(tag));
unsigned char decoded_field[MAX_ENCODED_OAUTH_TOKEN_SIZE];
const EVP_CIPHER *cipher = get_cipher_type(key->as_rs_alg);
if (!cipher) {
OAUTH_ERROR("%s: Cannot find cipher for algorithm: %d\n", __FUNCTION__, (int)key->as_rs_alg);
return false;
}
EVP_CIPHER_CTX *ctxp = EVP_CIPHER_CTX_new();
EVP_CIPHER_CTX_init(ctxp);
/* Initialize the decryption operation. */
if (1 != EVP_DecryptInit_ex(ctxp, cipher, NULL, NULL, NULL)) {
OAUTH_ERROR("%s: Cannot initialize decryption\n", __FUNCTION__);
return false;
}
// EVP_CIPHER_CTX_set_padding(&ctx,1);
/* Set IV length if default 12 bytes (96 bits) is not appropriate */
if (1 != EVP_CIPHER_CTX_ctrl(ctxp, EVP_CTRL_GCM_SET_IVLEN, nonce_len, NULL)) {
OAUTH_ERROR("%s: Cannot set nonce length\n", __FUNCTION__);
return false;
}
/* Initialize key and IV */
if (1 != EVP_DecryptInit_ex(ctxp, NULL, NULL, (const unsigned char *)key->as_rs_key, nonce)) {
OAUTH_ERROR("%s: Cannot set nonce\n", __FUNCTION__);
return false;
}
/* Set expected tag value. A restriction in OpenSSL 1.0.1c and earlier
+ * required the tag before any AAD or ciphertext */
EVP_CIPHER_CTX_ctrl(ctxp, EVP_CTRL_GCM_SET_TAG, OAUTH_GCM_TAG_SIZE, tag);
int outl = 0;
size_t sn_len = strlen((const char *)server_name);
/* Provide any AAD data. This can be called zero or more times as
* required
*/
if (1 != my_EVP_DecryptUpdate(ctxp, NULL, &outl, server_name, (int)sn_len)) {
OAUTH_ERROR("%s: Cannot decrypt update server_name: %s, len=%d\n", __FUNCTION__, server_name, (int)sn_len);
return false;
}
if (1 != my_EVP_DecryptUpdate(ctxp, decoded_field, &outl, encoded_field, (int)encoded_field_size)) {
OAUTH_ERROR("%s: Cannot decrypt update\n", __FUNCTION__);
return false;
}
int tmp_outl = 0;
if (EVP_DecryptFinal_ex(ctxp, decoded_field + outl, &tmp_outl) < 1) {
EVP_CIPHER_CTX_free(ctxp);
OAUTH_ERROR("%s: token integrity check failed\n", __FUNCTION__);
return false;
}
outl += tmp_outl;
EVP_CIPHER_CTX_free(ctxp);
size_t len = 0;
dtoken->enc_block.key_length = nswap16(*((uint16_t *)(decoded_field + len)));
len += 2;
memcpy(dtoken->enc_block.mac_key, decoded_field + len, dtoken->enc_block.key_length);
len += dtoken->enc_block.key_length;
uint64_t ts;
memcpy(&ts, (decoded_field + len), sizeof(ts));
dtoken->enc_block.timestamp = nswap64(ts);
len += sizeof(ts);
uint32_t lt;
memcpy(&lt, (decoded_field + len), sizeof(lt));
dtoken->enc_block.lifetime = nswap32(lt);
len += sizeof(lt);
return true;
}
return false;
}
#endif
#endif
bool encode_oauth_token(const uint8_t *server_name, encoded_oauth_token *etoken, const oauth_key *key,
const oauth_token *dtoken, const uint8_t *nonce) {
#if !defined(TURN_NO_OAUTH)
UNUSED_ARG(nonce);
if (server_name && etoken && key && dtoken) {
switch (key->as_rs_alg) {
#if !defined(TURN_NO_GCM)
case A256GCM:
case A128GCM:
return encode_oauth_token_gcm(server_name, etoken, key, dtoken, nonce);
#endif
default:
fprintf(stderr, "Unsupported AS_RS algorithm: %d\n", (int)key->as_rs_alg);
break;
};
}
return false;
#else
OAUTH_ERROR("Oauth support not included");
return false;
#endif
}
bool decode_oauth_token(const uint8_t *server_name, const encoded_oauth_token *etoken, const oauth_key *key,
oauth_token *dtoken) {
#if !defined(TURN_NO_OAUTH)
if (server_name && etoken && key && dtoken) {
switch (key->as_rs_alg) {
#if !defined(TURN_NO_GCM)
case A256GCM:
case A128GCM:
return decode_oauth_token_gcm(server_name, etoken, key, dtoken);
#endif
default:
fprintf(stderr, "Unsupported AS_RS algorithm: %d\n", (int)key->as_rs_alg);
break;
};
}
return false;
#else
OAUTH_ERROR("Oauth support not included");
return false;
#endif
}
///////////////////////////////////////////////////////////////
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