/
net_mosq.c
1199 lines (1043 loc) · 27.8 KB
/
net_mosq.c
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/*
Copyright (c) 2009-2020 Roger Light <[email protected]>
All rights reserved. This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
and Eclipse Distribution License v1.0 which accompany this distribution.
The Eclipse Public License is available at
https://www.eclipse.org/legal/epl-2.0/
and the Eclipse Distribution License is available at
http:https://www.eclipse.org/org/documents/edl-v10.php.
SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
Contributors:
Roger Light - initial implementation and documentation.
*/
#define _GNU_SOURCE
#include "config.h"
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#ifndef WIN32
#define _GNU_SOURCE
#include <netdb.h>
#include <netinet/tcp.h>
#include <sys/socket.h>
#include <unistd.h>
#else
#include <winsock2.h>
#include <ws2tcpip.h>
#endif
#ifdef __ANDROID__
#include <linux/in.h>
#include <linux/in6.h>
#include <sys/endian.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#ifdef WITH_UNIX_SOCKETS
# include <sys/un.h>
#endif
#ifdef __QNX__
#include <net/netbyte.h>
#endif
#ifdef WITH_TLS
#include <openssl/conf.h>
#include <openssl/engine.h>
#include <openssl/err.h>
#include <openssl/ui.h>
#include <tls_mosq.h>
#endif
#ifdef WITH_BROKER
# include "mosquitto_broker_internal.h"
# ifdef WITH_WEBSOCKETS
# include <libwebsockets.h>
# endif
#else
# include "read_handle.h"
#endif
#include "logging_mosq.h"
#include "memory_mosq.h"
#include "mqtt_protocol.h"
#include "net_mosq.h"
#include "time_mosq.h"
#include "util_mosq.h"
#ifdef WITH_TLS
int tls_ex_index_mosq = -1;
UI_METHOD *_ui_method = NULL;
static bool is_tls_initialized = false;
/* Functions taken from OpenSSL s_server/s_client */
static int ui_open(UI *ui)
{
return UI_method_get_opener(UI_OpenSSL())(ui);
}
static int ui_read(UI *ui, UI_STRING *uis)
{
return UI_method_get_reader(UI_OpenSSL())(ui, uis);
}
static int ui_write(UI *ui, UI_STRING *uis)
{
return UI_method_get_writer(UI_OpenSSL())(ui, uis);
}
static int ui_close(UI *ui)
{
return UI_method_get_closer(UI_OpenSSL())(ui);
}
static void setup_ui_method(void)
{
_ui_method = UI_create_method("OpenSSL application user interface");
UI_method_set_opener(_ui_method, ui_open);
UI_method_set_reader(_ui_method, ui_read);
UI_method_set_writer(_ui_method, ui_write);
UI_method_set_closer(_ui_method, ui_close);
}
static void cleanup_ui_method(void)
{
if(_ui_method){
UI_destroy_method(_ui_method);
_ui_method = NULL;
}
}
UI_METHOD *net__get_ui_method(void)
{
return _ui_method;
}
#endif
int net__init(void)
{
#ifdef WIN32
WSADATA wsaData;
if(WSAStartup(MAKEWORD(2,2), &wsaData) != 0){
return MOSQ_ERR_UNKNOWN;
}
#endif
#ifdef WITH_SRV
ares_library_init(ARES_LIB_INIT_ALL);
#endif
return MOSQ_ERR_SUCCESS;
}
void net__cleanup(void)
{
#ifdef WITH_TLS
# if OPENSSL_VERSION_NUMBER < 0x10100000L
CRYPTO_cleanup_all_ex_data();
ERR_free_strings();
ERR_remove_thread_state(NULL);
EVP_cleanup();
# if !defined(OPENSSL_NO_ENGINE)
ENGINE_cleanup();
# endif
is_tls_initialized = false;
# endif
CONF_modules_unload(1);
cleanup_ui_method();
#endif
#ifdef WITH_SRV
ares_library_cleanup();
#endif
#ifdef WIN32
WSACleanup();
#endif
}
#ifdef WITH_TLS
void net__init_tls(void)
{
if(is_tls_initialized) return;
# if OPENSSL_VERSION_NUMBER < 0x10100000L
SSL_load_error_strings();
SSL_library_init();
OpenSSL_add_all_algorithms();
# else
OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS \
| OPENSSL_INIT_ADD_ALL_DIGESTS \
| OPENSSL_INIT_LOAD_CONFIG, NULL);
# endif
#if !defined(OPENSSL_NO_ENGINE)
ENGINE_load_builtin_engines();
#endif
setup_ui_method();
if(tls_ex_index_mosq == -1){
tls_ex_index_mosq = SSL_get_ex_new_index(0, "client context", NULL, NULL, NULL);
}
is_tls_initialized = true;
}
#endif
/* Close a socket associated with a context and set it to -1.
* Returns 1 on failure (context is NULL)
* Returns 0 on success.
*/
int net__socket_close(struct mosquitto *mosq)
{
int rc = 0;
#ifdef WITH_BROKER
struct mosquitto *mosq_found;
#endif
assert(mosq);
#ifdef WITH_TLS
#ifdef WITH_WEBSOCKETS
if(!mosq->wsi)
#endif
{
if(mosq->ssl){
if(!SSL_in_init(mosq->ssl)){
SSL_shutdown(mosq->ssl);
}
SSL_free(mosq->ssl);
mosq->ssl = NULL;
}
}
#endif
#ifdef WITH_WEBSOCKETS
if(mosq->wsi)
{
if(mosq->state != mosq_cs_disconnecting){
mosquitto__set_state(mosq, mosq_cs_disconnect_ws);
}
lws_callback_on_writable(mosq->wsi);
}else
#endif
{
if(mosq->sock != INVALID_SOCKET){
#ifdef WITH_BROKER
HASH_FIND(hh_sock, db.contexts_by_sock, &mosq->sock, sizeof(mosq->sock), mosq_found);
if(mosq_found){
HASH_DELETE(hh_sock, db.contexts_by_sock, mosq_found);
}
#endif
rc = COMPAT_CLOSE(mosq->sock);
mosq->sock = INVALID_SOCKET;
}
}
#ifdef WITH_BROKER
if(mosq->listener){
mosq->listener->client_count--;
mosq->listener = NULL;
}
#endif
return rc;
}
#ifdef FINAL_WITH_TLS_PSK
static unsigned int psk_client_callback(SSL *ssl, const char *hint,
char *identity, unsigned int max_identity_len,
unsigned char *psk, unsigned int max_psk_len)
{
struct mosquitto *mosq;
int len;
UNUSED(hint);
mosq = SSL_get_ex_data(ssl, tls_ex_index_mosq);
if(!mosq) return 0;
snprintf(identity, max_identity_len, "%s", mosq->tls_psk_identity);
len = mosquitto__hex2bin(mosq->tls_psk, psk, (int)max_psk_len);
if (len < 0) return 0;
return (unsigned int)len;
}
#endif
#if defined(WITH_BROKER) && defined(__GLIBC__) && defined(WITH_ADNS)
/* Async connect, part 1 (dns lookup) */
int net__try_connect_step1(struct mosquitto *mosq, const char *host)
{
int s;
void *sevp = NULL;
struct addrinfo *hints;
if(mosq->adns){
gai_cancel(mosq->adns);
mosquitto__free((struct addrinfo *)mosq->adns->ar_request);
mosquitto__free(mosq->adns);
}
mosq->adns = mosquitto__calloc(1, sizeof(struct gaicb));
if(!mosq->adns){
return MOSQ_ERR_NOMEM;
}
hints = mosquitto__calloc(1, sizeof(struct addrinfo));
if(!hints){
mosquitto__free(mosq->adns);
mosq->adns = NULL;
return MOSQ_ERR_NOMEM;
}
hints->ai_family = AF_UNSPEC;
hints->ai_socktype = SOCK_STREAM;
mosq->adns->ar_name = host;
mosq->adns->ar_request = hints;
s = getaddrinfo_a(GAI_NOWAIT, &mosq->adns, 1, sevp);
if(s){
errno = s;
if(mosq->adns){
mosquitto__free((struct addrinfo *)mosq->adns->ar_request);
mosquitto__free(mosq->adns);
mosq->adns = NULL;
}
return MOSQ_ERR_EAI;
}
return MOSQ_ERR_SUCCESS;
}
/* Async connect part 2, the connection. */
int net__try_connect_step2(struct mosquitto *mosq, uint16_t port, mosq_sock_t *sock)
{
struct addrinfo *ainfo, *rp;
int rc;
ainfo = mosq->adns->ar_result;
for(rp = ainfo; rp != NULL; rp = rp->ai_next){
*sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if(*sock == INVALID_SOCKET) continue;
if(rp->ai_family == AF_INET){
((struct sockaddr_in *)rp->ai_addr)->sin_port = htons(port);
}else if(rp->ai_family == AF_INET6){
((struct sockaddr_in6 *)rp->ai_addr)->sin6_port = htons(port);
}else{
COMPAT_CLOSE(*sock);
*sock = INVALID_SOCKET;
continue;
}
/* Set non-blocking */
if(net__socket_nonblock(sock)){
continue;
}
rc = connect(*sock, rp->ai_addr, rp->ai_addrlen);
#ifdef WIN32
errno = WSAGetLastError();
#endif
if(rc == 0 || errno == EINPROGRESS || errno == COMPAT_EWOULDBLOCK){
if(rc < 0 && (errno == EINPROGRESS || errno == COMPAT_EWOULDBLOCK)){
rc = MOSQ_ERR_CONN_PENDING;
}
/* Set non-blocking */
if(net__socket_nonblock(sock)){
continue;
}
break;
}
COMPAT_CLOSE(*sock);
*sock = INVALID_SOCKET;
}
freeaddrinfo(mosq->adns->ar_result);
mosq->adns->ar_result = NULL;
mosquitto__free((struct addrinfo *)mosq->adns->ar_request);
mosquitto__free(mosq->adns);
mosq->adns = NULL;
if(!rp){
return MOSQ_ERR_ERRNO;
}
return rc;
}
#endif
static int net__try_connect_tcp(const char *host, uint16_t port, mosq_sock_t *sock, const char *bind_address, bool blocking)
{
struct addrinfo hints;
struct addrinfo *ainfo, *rp;
struct addrinfo *ainfo_bind, *rp_bind;
int s;
int rc = MOSQ_ERR_SUCCESS;
ainfo_bind = NULL;
*sock = INVALID_SOCKET;
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
s = getaddrinfo(host, NULL, &hints, &ainfo);
if(s){
errno = s;
return MOSQ_ERR_EAI;
}
if(bind_address){
s = getaddrinfo(bind_address, NULL, &hints, &ainfo_bind);
if(s){
freeaddrinfo(ainfo);
errno = s;
return MOSQ_ERR_EAI;
}
}
for(rp = ainfo; rp != NULL; rp = rp->ai_next){
*sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if(*sock == INVALID_SOCKET) continue;
if(rp->ai_family == AF_INET){
((struct sockaddr_in *)rp->ai_addr)->sin_port = htons(port);
}else if(rp->ai_family == AF_INET6){
((struct sockaddr_in6 *)rp->ai_addr)->sin6_port = htons(port);
}else{
COMPAT_CLOSE(*sock);
*sock = INVALID_SOCKET;
continue;
}
if(bind_address){
for(rp_bind = ainfo_bind; rp_bind != NULL; rp_bind = rp_bind->ai_next){
if(bind(*sock, rp_bind->ai_addr, rp_bind->ai_addrlen) == 0){
break;
}
}
if(!rp_bind){
COMPAT_CLOSE(*sock);
*sock = INVALID_SOCKET;
continue;
}
}
if(!blocking){
/* Set non-blocking */
if(net__socket_nonblock(sock)){
continue;
}
}
rc = connect(*sock, rp->ai_addr, rp->ai_addrlen);
#ifdef WIN32
errno = WSAGetLastError();
#endif
if(rc == 0 || errno == EINPROGRESS || errno == COMPAT_EWOULDBLOCK){
if(rc < 0 && (errno == EINPROGRESS || errno == COMPAT_EWOULDBLOCK)){
rc = MOSQ_ERR_CONN_PENDING;
}
if(blocking){
/* Set non-blocking */
if(net__socket_nonblock(sock)){
continue;
}
}
break;
}
COMPAT_CLOSE(*sock);
*sock = INVALID_SOCKET;
}
freeaddrinfo(ainfo);
if(bind_address){
freeaddrinfo(ainfo_bind);
}
if(!rp){
return MOSQ_ERR_ERRNO;
}
return rc;
}
#ifdef WITH_UNIX_SOCKETS
static int net__try_connect_unix(const char *host, mosq_sock_t *sock)
{
struct sockaddr_un addr;
int s;
int rc;
if(host == NULL || strlen(host) == 0 || strlen(host) > sizeof(addr.sun_path)-1){
return MOSQ_ERR_INVAL;
}
memset(&addr, 0, sizeof(struct sockaddr_un));
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, host, sizeof(addr.sun_path)-1);
s = socket(AF_UNIX, SOCK_STREAM, 0);
if(s < 0){
return MOSQ_ERR_ERRNO;
}
rc = net__socket_nonblock(&s);
if(rc) return rc;
rc = connect(s, (struct sockaddr *)&addr, sizeof(struct sockaddr_un));
if(rc < 0){
close(s);
return MOSQ_ERR_ERRNO;
}
*sock = s;
return 0;
}
#endif
int net__try_connect(const char *host, uint16_t port, mosq_sock_t *sock, const char *bind_address, bool blocking)
{
if(port == 0){
#ifdef WITH_UNIX_SOCKETS
return net__try_connect_unix(host, sock);
#else
return MOSQ_ERR_NOT_SUPPORTED;
#endif
}else{
return net__try_connect_tcp(host, port, sock, bind_address, blocking);
}
}
#ifdef WITH_TLS
void net__print_ssl_error(struct mosquitto *mosq)
{
char ebuf[256];
unsigned long e;
int num = 0;
e = ERR_get_error();
while(e){
log__printf(mosq, MOSQ_LOG_ERR, "OpenSSL Error[%d]: %s", num, ERR_error_string(e, ebuf));
e = ERR_get_error();
num++;
}
}
int net__socket_connect_tls(struct mosquitto *mosq)
{
int ret, err;
long res;
ERR_clear_error();
if (mosq->tls_ocsp_required) {
/* Note: OCSP is available in all currently supported OpenSSL versions. */
if ((res=SSL_set_tlsext_status_type(mosq->ssl, TLSEXT_STATUSTYPE_ocsp)) != 1) {
log__printf(mosq, MOSQ_LOG_ERR, "Could not activate OCSP (error: %ld)", res);
return MOSQ_ERR_OCSP;
}
if ((res=SSL_CTX_set_tlsext_status_cb(mosq->ssl_ctx, mosquitto__verify_ocsp_status_cb)) != 1) {
log__printf(mosq, MOSQ_LOG_ERR, "Could not activate OCSP (error: %ld)", res);
return MOSQ_ERR_OCSP;
}
if ((res=SSL_CTX_set_tlsext_status_arg(mosq->ssl_ctx, mosq)) != 1) {
log__printf(mosq, MOSQ_LOG_ERR, "Could not activate OCSP (error: %ld)", res);
return MOSQ_ERR_OCSP;
}
}
SSL_set_connect_state(mosq->ssl);
return MOSQ_ERR_SUCCESS;
}
#endif
#ifdef WITH_TLS
static int net__tls_load_ca(struct mosquitto *mosq)
{
int ret;
if(mosq->tls_use_os_certs){
SSL_CTX_set_default_verify_paths(mosq->ssl_ctx);
}
#if OPENSSL_VERSION_NUMBER < 0x30000000L
if(mosq->tls_cafile || mosq->tls_capath){
ret = SSL_CTX_load_verify_locations(mosq->ssl_ctx, mosq->tls_cafile, mosq->tls_capath);
if(ret == 0){
# ifdef WITH_BROKER
if(mosq->tls_cafile && mosq->tls_capath){
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load CA certificates, check bridge_cafile \"%s\" and bridge_capath \"%s\".", mosq->tls_cafile, mosq->tls_capath);
}else if(mosq->tls_cafile){
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load CA certificates, check bridge_cafile \"%s\".", mosq->tls_cafile);
}else{
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load CA certificates, check bridge_capath \"%s\".", mosq->tls_capath);
}
# else
if(mosq->tls_cafile && mosq->tls_capath){
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load CA certificates, check cafile \"%s\" and capath \"%s\".", mosq->tls_cafile, mosq->tls_capath);
}else if(mosq->tls_cafile){
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load CA certificates, check cafile \"%s\".", mosq->tls_cafile);
}else{
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load CA certificates, check capath \"%s\".", mosq->tls_capath);
}
# endif
return MOSQ_ERR_TLS;
}
}
#else
if(mosq->tls_cafile){
ret = SSL_CTX_load_verify_file(mosq->ssl_ctx, mosq->tls_cafile);
if(ret == 0){
# ifdef WITH_BROKER
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load CA certificates, check bridge_cafile \"%s\".", mosq->tls_cafile);
# else
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load CA certificates, check cafile \"%s\".", mosq->tls_cafile);
# endif
return MOSQ_ERR_TLS;
}
}
if(mosq->tls_capath){
ret = SSL_CTX_load_verify_dir(mosq->ssl_ctx, mosq->tls_capath);
if(ret == 0){
# ifdef WITH_BROKER
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load CA certificates, check bridge_capath \"%s\".", mosq->tls_capath);
# else
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load CA certificates, check capath \"%s\".", mosq->tls_capath);
# endif
return MOSQ_ERR_TLS;
}
}
#endif
return MOSQ_ERR_SUCCESS;
}
static int net__init_ssl_ctx(struct mosquitto *mosq)
{
int ret;
ENGINE *engine = NULL;
uint8_t tls_alpn_wire[256];
uint8_t tls_alpn_len;
#if !defined(OPENSSL_NO_ENGINE)
EVP_PKEY *pkey;
#endif
#ifndef WITH_BROKER
if(mosq->user_ssl_ctx){
mosq->ssl_ctx = mosq->user_ssl_ctx;
if(!mosq->ssl_ctx_defaults){
return MOSQ_ERR_SUCCESS;
}else if(!mosq->tls_cafile && !mosq->tls_capath && !mosq->tls_psk){
log__printf(mosq, MOSQ_LOG_ERR, "Error: If you use MOSQ_OPT_SSL_CTX then MOSQ_OPT_SSL_CTX_WITH_DEFAULTS must be true, or at least one of cafile, capath or psk must be specified.");
return MOSQ_ERR_INVAL;
}
}
#endif
/* Apply default SSL_CTX settings. This is only used if MOSQ_OPT_SSL_CTX
* has not been set, or if both of MOSQ_OPT_SSL_CTX and
* MOSQ_OPT_SSL_CTX_WITH_DEFAULTS are set. */
if(mosq->tls_cafile || mosq->tls_capath || mosq->tls_psk || mosq->tls_use_os_certs){
net__init_tls();
if(!mosq->ssl_ctx){
#if OPENSSL_VERSION_NUMBER < 0x10100000L
mosq->ssl_ctx = SSL_CTX_new(SSLv23_client_method());
#else
mosq->ssl_ctx = SSL_CTX_new(TLS_client_method());
#endif
if(!mosq->ssl_ctx){
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to create TLS context.");
net__print_ssl_error(mosq);
return MOSQ_ERR_TLS;
}
}
#ifdef SSL_OP_NO_TLSv1_3
if(mosq->tls_psk){
SSL_CTX_set_options(mosq->ssl_ctx, SSL_OP_NO_TLSv1_3);
}
#endif
if(!mosq->tls_version){
SSL_CTX_set_options(mosq->ssl_ctx, SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1);
#ifdef SSL_OP_NO_TLSv1_3
}else if(!strcmp(mosq->tls_version, "tlsv1.3")){
SSL_CTX_set_options(mosq->ssl_ctx, SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1 | SSL_OP_NO_TLSv1_2);
#endif
}else if(!strcmp(mosq->tls_version, "tlsv1.2")){
SSL_CTX_set_options(mosq->ssl_ctx, SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1);
}else if(!strcmp(mosq->tls_version, "tlsv1.1")){
SSL_CTX_set_options(mosq->ssl_ctx, SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1);
}else{
log__printf(mosq, MOSQ_LOG_ERR, "Error: Protocol %s not supported.", mosq->tls_version);
return MOSQ_ERR_INVAL;
}
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
/* Allow use of DHE ciphers */
SSL_CTX_set_dh_auto(mosq->ssl_ctx, 1);
#endif
/* Disable compression */
SSL_CTX_set_options(mosq->ssl_ctx, SSL_OP_NO_COMPRESSION);
/* Set ALPN */
if(mosq->tls_alpn) {
tls_alpn_len = (uint8_t) strnlen(mosq->tls_alpn, 254);
tls_alpn_wire[0] = tls_alpn_len; /* first byte is length of string */
memcpy(tls_alpn_wire + 1, mosq->tls_alpn, tls_alpn_len);
SSL_CTX_set_alpn_protos(mosq->ssl_ctx, tls_alpn_wire, tls_alpn_len + 1U);
}
#ifdef SSL_MODE_RELEASE_BUFFERS
/* Use even less memory per SSL connection. */
SSL_CTX_set_mode(mosq->ssl_ctx, SSL_MODE_RELEASE_BUFFERS);
#endif
#if !defined(OPENSSL_NO_ENGINE)
if(mosq->tls_engine){
engine = ENGINE_by_id(mosq->tls_engine);
if(!engine){
log__printf(mosq, MOSQ_LOG_ERR, "Error loading %s engine\n", mosq->tls_engine);
return MOSQ_ERR_TLS;
}
if(!ENGINE_init(engine)){
log__printf(mosq, MOSQ_LOG_ERR, "Failed engine initialisation\n");
ENGINE_free(engine);
return MOSQ_ERR_TLS;
}
ENGINE_set_default(engine, ENGINE_METHOD_ALL);
ENGINE_free(engine); /* release the structural reference from ENGINE_by_id() */
}
#endif
if(mosq->tls_ciphers){
ret = SSL_CTX_set_cipher_list(mosq->ssl_ctx, mosq->tls_ciphers);
if(ret == 0){
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to set TLS ciphers. Check cipher list \"%s\".", mosq->tls_ciphers);
#if !defined(OPENSSL_NO_ENGINE)
ENGINE_FINISH(engine);
#endif
net__print_ssl_error(mosq);
return MOSQ_ERR_TLS;
}
}
if(mosq->tls_cafile || mosq->tls_capath || mosq->tls_use_os_certs){
ret = net__tls_load_ca(mosq);
if(ret != MOSQ_ERR_SUCCESS){
# if !defined(OPENSSL_NO_ENGINE)
ENGINE_FINISH(engine);
# endif
net__print_ssl_error(mosq);
return MOSQ_ERR_TLS;
}
if(mosq->tls_cert_reqs == 0){
SSL_CTX_set_verify(mosq->ssl_ctx, SSL_VERIFY_NONE, NULL);
}else{
SSL_CTX_set_verify(mosq->ssl_ctx, SSL_VERIFY_PEER, mosquitto__server_certificate_verify);
}
if(mosq->tls_pw_callback){
SSL_CTX_set_default_passwd_cb(mosq->ssl_ctx, mosq->tls_pw_callback);
SSL_CTX_set_default_passwd_cb_userdata(mosq->ssl_ctx, mosq);
}
if(mosq->tls_certfile){
ret = SSL_CTX_use_certificate_chain_file(mosq->ssl_ctx, mosq->tls_certfile);
if(ret != 1){
#ifdef WITH_BROKER
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load client certificate, check bridge_certfile \"%s\".", mosq->tls_certfile);
#else
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load client certificate \"%s\".", mosq->tls_certfile);
#endif
#if !defined(OPENSSL_NO_ENGINE)
ENGINE_FINISH(engine);
#endif
net__print_ssl_error(mosq);
return MOSQ_ERR_TLS;
}
}
if(mosq->tls_keyfile){
if(mosq->tls_keyform == mosq_k_engine){
#if !defined(OPENSSL_NO_ENGINE)
UI_METHOD *ui_method = net__get_ui_method();
if(mosq->tls_engine_kpass_sha1){
if(!ENGINE_ctrl_cmd(engine, ENGINE_SECRET_MODE, ENGINE_SECRET_MODE_SHA, NULL, NULL, 0)){
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to set engine secret mode sha1");
ENGINE_FINISH(engine);
net__print_ssl_error(mosq);
return MOSQ_ERR_TLS;
}
if(!ENGINE_ctrl_cmd(engine, ENGINE_PIN, 0, mosq->tls_engine_kpass_sha1, NULL, 0)){
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to set engine pin");
ENGINE_FINISH(engine);
net__print_ssl_error(mosq);
return MOSQ_ERR_TLS;
}
ui_method = NULL;
}
pkey = ENGINE_load_private_key(engine, mosq->tls_keyfile, ui_method, NULL);
if(!pkey){
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load engine private key file \"%s\".", mosq->tls_keyfile);
ENGINE_FINISH(engine);
net__print_ssl_error(mosq);
return MOSQ_ERR_TLS;
}
if(SSL_CTX_use_PrivateKey(mosq->ssl_ctx, pkey) <= 0){
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to use engine private key file \"%s\".", mosq->tls_keyfile);
ENGINE_FINISH(engine);
net__print_ssl_error(mosq);
return MOSQ_ERR_TLS;
}
#endif
}else{
ret = SSL_CTX_use_PrivateKey_file(mosq->ssl_ctx, mosq->tls_keyfile, SSL_FILETYPE_PEM);
if(ret != 1){
#ifdef WITH_BROKER
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load client key file, check bridge_keyfile \"%s\".", mosq->tls_keyfile);
#else
log__printf(mosq, MOSQ_LOG_ERR, "Error: Unable to load client key file \"%s\".", mosq->tls_keyfile);
#endif
#if !defined(OPENSSL_NO_ENGINE)
ENGINE_FINISH(engine);
#endif
net__print_ssl_error(mosq);
return MOSQ_ERR_TLS;
}
}
ret = SSL_CTX_check_private_key(mosq->ssl_ctx);
if(ret != 1){
log__printf(mosq, MOSQ_LOG_ERR, "Error: Client certificate/key are inconsistent.");
#if !defined(OPENSSL_NO_ENGINE)
ENGINE_FINISH(engine);
#endif
net__print_ssl_error(mosq);
return MOSQ_ERR_TLS;
}
}
#ifdef FINAL_WITH_TLS_PSK
}else if(mosq->tls_psk){
SSL_CTX_set_psk_client_callback(mosq->ssl_ctx, psk_client_callback);
if(mosq->tls_ciphers == NULL){
SSL_CTX_set_cipher_list(mosq->ssl_ctx, "PSK");
}
#endif
}
}
return MOSQ_ERR_SUCCESS;
}
#endif
int net__socket_connect_step3(struct mosquitto *mosq, const char *host)
{
#ifdef WITH_TLS
BIO *bio;
int rc = net__init_ssl_ctx(mosq);
if(rc){
net__socket_close(mosq);
return rc;
}
if(mosq->ssl_ctx){
if(mosq->ssl){
SSL_free(mosq->ssl);
}
mosq->ssl = SSL_new(mosq->ssl_ctx);
if(!mosq->ssl){
net__socket_close(mosq);
net__print_ssl_error(mosq);
return MOSQ_ERR_TLS;
}
SSL_set_ex_data(mosq->ssl, tls_ex_index_mosq, mosq);
bio = BIO_new_socket(mosq->sock, BIO_NOCLOSE);
if(!bio){
net__socket_close(mosq);
net__print_ssl_error(mosq);
return MOSQ_ERR_TLS;
}
SSL_set_bio(mosq->ssl, bio, bio);
/*
* required for the SNI resolving
*/
if(SSL_set_tlsext_host_name(mosq->ssl, host) != 1) {
net__socket_close(mosq);
return MOSQ_ERR_TLS;
}
if(net__socket_connect_tls(mosq)){
net__socket_close(mosq);
return MOSQ_ERR_TLS;
}
}
#else
UNUSED(mosq);
UNUSED(host);
#endif
return MOSQ_ERR_SUCCESS;
}
/* Create a socket and connect it to 'ip' on port 'port'. */
int net__socket_connect(struct mosquitto *mosq, const char *host, uint16_t port, const char *bind_address, bool blocking)
{
int rc, rc2;
if(!mosq || !host) return MOSQ_ERR_INVAL;
rc = net__try_connect(host, port, &mosq->sock, bind_address, blocking);
if(rc > 0) return rc;
if(mosq->tcp_nodelay){
int flag = 1;
if(setsockopt(mosq->sock, IPPROTO_TCP, TCP_NODELAY, (const void*)&flag, sizeof(int)) != 0){
log__printf(mosq, MOSQ_LOG_WARNING, "Warning: Unable to set TCP_NODELAY.");
}
}
#if defined(WITH_SOCKS) && !defined(WITH_BROKER)
if(!mosq->socks5_host)
#endif
{
rc2 = net__socket_connect_step3(mosq, host);
if(rc2) return rc2;
}
return rc;
}
#ifdef WITH_TLS
static int net__handle_ssl(struct mosquitto* mosq, int ret)
{
int err;
err = SSL_get_error(mosq->ssl, ret);
if (err == SSL_ERROR_WANT_READ) {
ret = -1;
errno = EAGAIN;
}
else if (err == SSL_ERROR_WANT_WRITE) {
ret = -1;
#ifdef WITH_BROKER
mux__add_out(mosq);
#else
mosq->want_write = true;
#endif
errno = EAGAIN;
}
else {
net__print_ssl_error(mosq);
errno = EPROTO;
}
ERR_clear_error();
#ifdef WIN32
WSASetLastError(errno);
#endif
return ret;
}
#endif
ssize_t net__read(struct mosquitto *mosq, void *buf, size_t count)
{
#ifdef WITH_TLS
int ret;
#endif
assert(mosq);
errno = 0;
#ifdef WITH_TLS
if(mosq->ssl){
ret = SSL_read(mosq->ssl, buf, (int)count);
if(ret <= 0){
ret = net__handle_ssl(mosq, ret);
}
return (ssize_t )ret;
}else{
/* Call normal read/recv */
#endif
#ifndef WIN32
return read(mosq->sock, buf, count);
#else
return recv(mosq->sock, buf, count, 0);
#endif
#ifdef WITH_TLS
}
#endif
}
ssize_t net__write(struct mosquitto *mosq, const void *buf, size_t count)