Adding upstream version 1.46.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 754 insertions, 0 deletions

diff --git a/src/libnetdata/socket/security.c b/src/libnetdata/socket/security.c
new file mode 100644
index 00000000..502998b7
--- /dev/null
+++ b/src/libnetdata/socket/security.c
@@ -0,0 +1,754 @@
+#include "../libnetdata.h"
+
+#ifdef ENABLE_HTTPS
+
+SSL_CTX *netdata_ssl_exporting_ctx =NULL;
+SSL_CTX *netdata_ssl_streaming_sender_ctx =NULL;
+SSL_CTX *netdata_ssl_web_server_ctx =NULL;
+const char *netdata_ssl_security_key =NULL;
+const char *netdata_ssl_security_cert =NULL;
+const char *tls_version=NULL;
+const char *tls_ciphers=NULL;
+bool netdata_ssl_validate_certificate =  true;
+bool netdata_ssl_validate_certificate_sender =  true;
+
+static SOCKET_PEERS netdata_ssl_peers(NETDATA_SSL *ssl) {
+    int sock_fd;
+
+    if(unlikely(!ssl->conn))
+        sock_fd = -1;
+    else
+        sock_fd = SSL_get_rfd(ssl->conn);
+
+    return socket_peers(sock_fd);
+}
+
+static void netdata_ssl_log_error_queue(const char *call, NETDATA_SSL *ssl, unsigned long err) {
+    nd_log_limit_static_thread_var(erl, 1, 0);
+
+    if(err == SSL_ERROR_NONE)
+        err = ERR_get_error();
+
+    if(err == SSL_ERROR_NONE)
+        return;
+
+    do {
+        char *code;
+
+        switch (err) {
+            case SSL_ERROR_SSL:
+                code = "SSL_ERROR_SSL";
+                ssl->state = NETDATA_SSL_STATE_FAILED;
+                break;
+
+            case SSL_ERROR_WANT_READ:
+                code = "SSL_ERROR_WANT_READ";
+                break;
+
+            case SSL_ERROR_WANT_WRITE:
+                code = "SSL_ERROR_WANT_WRITE";
+                break;
+
+            case SSL_ERROR_WANT_X509_LOOKUP:
+                code = "SSL_ERROR_WANT_X509_LOOKUP";
+                break;
+
+            case SSL_ERROR_SYSCALL:
+                code = "SSL_ERROR_SYSCALL";
+                ssl->state = NETDATA_SSL_STATE_FAILED;
+                break;
+
+            case SSL_ERROR_ZERO_RETURN:
+                code = "SSL_ERROR_ZERO_RETURN";
+                break;
+
+            case SSL_ERROR_WANT_CONNECT:
+                code = "SSL_ERROR_WANT_CONNECT";
+                break;
+
+            case SSL_ERROR_WANT_ACCEPT:
+                code = "SSL_ERROR_WANT_ACCEPT";
+                break;
+
+#ifdef SSL_ERROR_WANT_ASYNC
+            case SSL_ERROR_WANT_ASYNC:
+                code = "SSL_ERROR_WANT_ASYNC";
+                break;
+#endif
+
+#ifdef SSL_ERROR_WANT_ASYNC_JOB
+            case SSL_ERROR_WANT_ASYNC_JOB:
+                code = "SSL_ERROR_WANT_ASYNC_JOB";
+                break;
+#endif
+
+#ifdef SSL_ERROR_WANT_CLIENT_HELLO_CB
+            case SSL_ERROR_WANT_CLIENT_HELLO_CB:
+                code = "SSL_ERROR_WANT_CLIENT_HELLO_CB";
+                break;
+#endif
+
+#ifdef SSL_ERROR_WANT_RETRY_VERIFY
+            case SSL_ERROR_WANT_RETRY_VERIFY:
+                code = "SSL_ERROR_WANT_RETRY_VERIFY";
+                break;
+#endif
+
+            default:
+                code = "SSL_ERROR_UNKNOWN";
+                break;
+        }
+
+        char str[1024 + 1];
+        ERR_error_string_n(err, str, 1024);
+        str[1024] = '\0';
+        SOCKET_PEERS peers = netdata_ssl_peers(ssl);
+        nd_log_limit(&erl, NDLS_DAEMON, NDLP_ERR,
+                     "SSL: %s() on socket local [[%s]:%d] <-> remote [[%s]:%d], returned error %lu (%s): %s",
+                     call, peers.local.ip, peers.local.port, peers.peer.ip, peers.peer.port, err, code, str);
+
+    } while((err = ERR_get_error()));
+}
+
+bool netdata_ssl_open_ext(NETDATA_SSL *ssl, SSL_CTX *ctx, int fd, const unsigned char *alpn_protos, unsigned int alpn_protos_len) {
+    errno = 0;
+    ssl->ssl_errno = 0;
+
+    if(ssl->conn) {
+        if(!ctx || SSL_get_SSL_CTX(ssl->conn) != ctx) {
+            SSL_free(ssl->conn);
+            ssl->conn = NULL;
+        }
+        else if (SSL_clear(ssl->conn) == 0) {
+            netdata_ssl_log_error_queue("SSL_clear", ssl, SSL_ERROR_NONE);
+            SSL_free(ssl->conn);
+            ssl->conn = NULL;
+        }
+    }
+
+    if(!ssl->conn) {
+        if(!ctx) {
+            internal_error(true, "SSL: not CTX given");
+            ssl->state = NETDATA_SSL_STATE_FAILED;
+            return false;
+        }
+
+        ssl->conn = SSL_new(ctx);
+        if (!ssl->conn) {
+            netdata_ssl_log_error_queue("SSL_new", ssl, SSL_ERROR_NONE);
+            ssl->state = NETDATA_SSL_STATE_FAILED;
+            return false;
+        }
+        if (alpn_protos && alpn_protos_len > 0)
+            SSL_set_alpn_protos(ssl->conn, alpn_protos, alpn_protos_len);
+    }
+
+    if(SSL_set_fd(ssl->conn, fd) != 1) {
+        netdata_ssl_log_error_queue("SSL_set_fd", ssl, SSL_ERROR_NONE);
+        ssl->state = NETDATA_SSL_STATE_FAILED;
+        return false;
+    }
+
+    ssl->state = NETDATA_SSL_STATE_INIT;
+
+    ERR_clear_error();
+
+    return true;
+}
+
+bool netdata_ssl_open(NETDATA_SSL *ssl, SSL_CTX *ctx, int fd) {
+    return netdata_ssl_open_ext(ssl, ctx, fd, NULL, 0);
+}
+
+void netdata_ssl_close(NETDATA_SSL *ssl) {
+    errno = 0;
+    ssl->ssl_errno = 0;
+
+    if(ssl->conn) {
+        if(SSL_connection(ssl)) {
+            int ret = SSL_shutdown(ssl->conn);
+            if(ret == 0)
+                SSL_shutdown(ssl->conn);
+        }
+
+        SSL_free(ssl->conn);
+
+        ERR_clear_error();
+    }
+
+    *ssl = NETDATA_SSL_UNSET_CONNECTION;
+}
+
+static inline bool is_handshake_complete(NETDATA_SSL *ssl, const char *op) {
+    nd_log_limit_static_thread_var(erl, 1, 0);
+
+    if(unlikely(!ssl->conn)) {
+        internal_error(true, "SSL: trying to %s on a NULL connection", op);
+        return false;
+    }
+
+    switch(ssl->state) {
+        case NETDATA_SSL_STATE_NOT_SSL: {
+            SOCKET_PEERS peers = netdata_ssl_peers(ssl);
+            nd_log_limit(&erl, NDLS_DAEMON, NDLP_WARNING,
+                         "SSL: on socket local [[%s]:%d] <-> remote [[%s]:%d], attempt to %s on non-SSL connection",
+                         peers.local.ip, peers.local.port, peers.peer.ip, peers.peer.port, op);
+            return false;
+        }
+
+        case NETDATA_SSL_STATE_INIT: {
+            SOCKET_PEERS peers = netdata_ssl_peers(ssl);
+            nd_log_limit(&erl, NDLS_DAEMON, NDLP_WARNING,
+                         "SSL: on socket local [[%s]:%d] <-> remote [[%s]:%d], attempt to %s on an incomplete connection",
+                         peers.local.ip, peers.local.port, peers.peer.ip, peers.peer.port, op);
+            return false;
+        }
+
+        case NETDATA_SSL_STATE_FAILED: {
+            SOCKET_PEERS peers = netdata_ssl_peers(ssl);
+            nd_log_limit(&erl, NDLS_DAEMON, NDLP_WARNING,
+                         "SSL: on socket local [[%s]:%d] <-> remote [[%s]:%d], attempt to %s on a failed connection",
+                         peers.local.ip, peers.local.port, peers.peer.ip, peers.peer.port, op);
+            return false;
+        }
+
+        case NETDATA_SSL_STATE_COMPLETE: {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+/*
+ * netdata_ssl_read() should return the same as read():
+ *
+ * Positive value: The read() function succeeded and read some bytes. The exact number of bytes read is returned.
+ *
+ * Zero: For files and sockets, a return value of zero signifies end-of-file (EOF), meaning no more data is available
+ *       for reading. For sockets, this usually means the other side has closed the connection.
+ *
+ * -1: An error occurred. The specific error can be found by examining the errno variable.
+ *     EAGAIN or EWOULDBLOCK: The file descriptor is in non-blocking mode, and the read operation would block.
+ *     (These are often the same value, but can be different on some systems.)
+ */
+
+ssize_t netdata_ssl_pending(NETDATA_SSL *ssl) {
+    return SSL_pending(ssl->conn);
+}
+
+bool netdata_ssl_has_pending(NETDATA_SSL *ssl) {
+    // this call was added on OpenSSL 1.1.0
+    // however, it is more accurate than SSL_pending()
+    // unfortunately it does not exists in libressl.
+    // return SSL_has_pending(ssl->conn);
+
+    return SSL_pending(ssl->conn) > 0;
+}
+
+ssize_t netdata_ssl_read(NETDATA_SSL *ssl, void *buf, size_t num) {
+    errno = 0;
+    ssl->ssl_errno = 0;
+
+    if(unlikely(!is_handshake_complete(ssl, "read")))
+        return -1;
+
+    int bytes = SSL_read(ssl->conn, buf, (int)num);
+
+    if(unlikely(bytes <= 0)) {
+        int err = SSL_get_error(ssl->conn, bytes);
+        if (err == SSL_ERROR_ZERO_RETURN) {
+            ssl->ssl_errno = err;
+            return 0;
+        }
+
+        if (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE) {
+            ssl->ssl_errno = err;
+            errno = EWOULDBLOCK;
+        }
+        else
+            netdata_ssl_log_error_queue("SSL_read", ssl, err);
+
+        bytes = -1;  // according to read() or recv()
+    }
+
+    return bytes;
+}
+
+/*
+ * netdata_ssl_write() should return the same as write():
+ *
+ * Positive value: The write() function succeeded and wrote some bytes. The exact number of bytes written is returned.
+ *
+ * Zero: It's technically possible for write() to return zero, indicating that zero bytes were written. However, for a
+ * socket, this generally does not happen unless the size of the data to be written is zero.
+ *
+ * -1: An error occurred. The specific error can be found by examining the errno variable.
+ *     EAGAIN or EWOULDBLOCK: The file descriptor is in non-blocking mode, and the write operation would block.
+ *     (These are often the same value, but can be different on some systems.)
+ */
+
+ssize_t netdata_ssl_write(NETDATA_SSL *ssl, const void *buf, size_t num) {
+    errno = 0;
+    ssl->ssl_errno = 0;
+
+    if(unlikely(!is_handshake_complete(ssl, "write")))
+        return -1;
+
+    int bytes = SSL_write(ssl->conn, (uint8_t *)buf, (int)num);
+
+    if(unlikely(bytes <= 0)) {
+        int err = SSL_get_error(ssl->conn, bytes);
+        if (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE) {
+            ssl->ssl_errno = err;
+            errno = EWOULDBLOCK;
+        }
+        else
+            netdata_ssl_log_error_queue("SSL_write", ssl, err);
+
+        bytes = -1; // according to write() or send()
+    }
+
+    return bytes;
+}
+
+static inline bool is_handshake_initialized(NETDATA_SSL *ssl, const char *op) {
+    nd_log_limit_static_thread_var(erl, 1, 0);
+
+    if(unlikely(!ssl->conn)) {
+        internal_error(true, "SSL: trying to %s on a NULL connection", op);
+        return false;
+    }
+
+    switch(ssl->state) {
+        case NETDATA_SSL_STATE_NOT_SSL: {
+            SOCKET_PEERS peers = netdata_ssl_peers(ssl);
+            nd_log_limit(&erl,  NDLS_DAEMON, NDLP_WARNING,
+                         "SSL: on socket local [[%s]:%d] <-> remote [[%s]:%d], attempt to %s on non-SSL connection",
+                         peers.local.ip, peers.local.port, peers.peer.ip, peers.peer.port, op);
+            return false;
+        }
+
+        case NETDATA_SSL_STATE_INIT: {
+            return true;
+        }
+
+        case NETDATA_SSL_STATE_FAILED: {
+            SOCKET_PEERS peers = netdata_ssl_peers(ssl);
+            nd_log_limit(&erl, NDLS_DAEMON, NDLP_WARNING,
+                         "SSL: on socket local [[%s]:%d] <-> remote [[%s]:%d], attempt to %s on a failed connection",
+                         peers.local.ip, peers.local.port, peers.peer.ip, peers.peer.port, op);
+            return false;
+        }
+
+        case NETDATA_SSL_STATE_COMPLETE: {
+            SOCKET_PEERS peers = netdata_ssl_peers(ssl);
+            nd_log_limit(&erl, NDLS_DAEMON, NDLP_WARNING,
+                         "SSL: on socket local [[%s]:%d] <-> remote [[%s]:%d], attempt to %s on an complete connection",
+                         peers.local.ip, peers.local.port, peers.peer.ip, peers.peer.port, op);
+            return false;
+        }
+    }
+
+    return false;
+}
+
+#define WANT_READ_WRITE_TIMEOUT_MS 10
+
+static inline bool want_read_write_should_retry(NETDATA_SSL *ssl, int err) {
+    int ssl_errno = SSL_get_error(ssl->conn, err);
+    if(ssl_errno == SSL_ERROR_WANT_READ || ssl_errno == SSL_ERROR_WANT_WRITE) {
+        struct pollfd pfds[1] = { [0] = {
+                .fd = SSL_get_rfd(ssl->conn),
+                .events = (short)(((ssl_errno == SSL_ERROR_WANT_READ ) ? POLLIN  : 0) |
+                                  ((ssl_errno == SSL_ERROR_WANT_WRITE) ? POLLOUT : 0)),
+        }};
+
+        if(poll(pfds, 1, WANT_READ_WRITE_TIMEOUT_MS) <= 0)
+            return false; // timeout (0) or error (<0)
+
+        return true; // we have activity, so we should retry
+    }
+
+    return false; // an unknown error
+}
+
+bool netdata_ssl_connect(NETDATA_SSL *ssl) {
+    errno = 0;
+    ssl->ssl_errno = 0;
+
+    if(unlikely(!is_handshake_initialized(ssl, "connect")))
+        return false;
+
+    SSL_set_connect_state(ssl->conn);
+
+    int err;
+    while ((err = SSL_connect(ssl->conn)) != 1) {
+        if(!want_read_write_should_retry(ssl, err))
+            break;
+    }
+
+    if (err != 1) {
+        err = SSL_get_error(ssl->conn, err);
+        netdata_ssl_log_error_queue("SSL_connect", ssl, err);
+        ssl->state = NETDATA_SSL_STATE_FAILED;
+        return false;
+    }
+
+    ssl->state = NETDATA_SSL_STATE_COMPLETE;
+    return true;
+}
+
+bool netdata_ssl_accept(NETDATA_SSL *ssl) {
+    errno = 0;
+    ssl->ssl_errno = 0;
+
+    if(unlikely(!is_handshake_initialized(ssl, "accept")))
+        return false;
+
+    SSL_set_accept_state(ssl->conn);
+
+    int err;
+    while ((err = SSL_accept(ssl->conn)) != 1) {
+        if(!want_read_write_should_retry(ssl, err))
+            break;
+    }
+
+    if (err != 1) {
+        err = SSL_get_error(ssl->conn, err);
+        netdata_ssl_log_error_queue("SSL_accept", ssl, err);
+        ssl->state = NETDATA_SSL_STATE_FAILED;
+        return false;
+    }
+
+    ssl->state = NETDATA_SSL_STATE_COMPLETE;
+    return true;
+}
+
+/**
+ * Info Callback
+ *
+ * Function used as callback for the OpenSSL Library
+ *
+ * @param ssl a pointer to the SSL structure of the client
+ * @param where the variable with the flags set.
+ * @param ret the return of the caller
+ */
+static void netdata_ssl_info_callback(const SSL *ssl, int where, int ret __maybe_unused) {
+    (void)ssl;
+    if (where & SSL_CB_ALERT) {
+        netdata_log_debug(D_WEB_CLIENT,"SSL INFO CALLBACK %s %s", SSL_alert_type_string(ret), SSL_alert_desc_string_long(ret));
+    }
+}
+
+/**
+ * OpenSSL Library
+ *
+ * Starts the openssl library for the Netdata.
+ */
+void netdata_ssl_initialize_openssl() {
+
+#if OPENSSL_VERSION_NUMBER < OPENSSL_VERSION_110
+# if (SSLEAY_VERSION_NUMBER >= OPENSSL_VERSION_097)
+    OPENSSL_config(NULL);
+# endif
+
+    SSL_load_error_strings();
+
+    SSL_library_init();
+
+#else
+
+    if (OPENSSL_init_ssl(OPENSSL_INIT_LOAD_CONFIG, NULL) != 1) {
+        netdata_log_error("SSL library cannot be initialized.");
+    }
+
+#endif
+}
+
+#if OPENSSL_VERSION_NUMBER >= OPENSSL_VERSION_110
+/**
+ * TLS version
+ *
+ * Returns the TLS version depending of the user input.
+ *
+ * @param lversion is the user input.
+ *
+ * @return it returns the version number.
+ */
+static int netdata_ssl_select_tls_version(const char *lversion) {
+    if (!strcmp(lversion, "1") || !strcmp(lversion, "1.0"))
+        return TLS1_VERSION;
+    else if (!strcmp(lversion, "1.1"))
+        return TLS1_1_VERSION;
+    else if (!strcmp(lversion, "1.2"))
+        return TLS1_2_VERSION;
+#if defined(TLS1_3_VERSION)
+    else if (!strcmp(lversion, "1.3"))
+        return TLS1_3_VERSION;
+#endif
+
+#if defined(TLS_MAX_VERSION)
+    return TLS_MAX_VERSION;
+#else
+    return TLS1_2_VERSION;
+#endif
+}
+#endif
+
+/**
+ * Initialize Openssl Client
+ *
+ * Starts the client context with TLS 1.2.
+ *
+ * @return It returns the context on success or NULL otherwise
+ */
+SSL_CTX * netdata_ssl_create_client_ctx(unsigned long mode) {
+    SSL_CTX *ctx;
+#if OPENSSL_VERSION_NUMBER < OPENSSL_VERSION_110
+    ctx = SSL_CTX_new(SSLv23_client_method());
+#else
+    ctx = SSL_CTX_new(TLS_client_method());
+#endif
+    if(ctx) {
+#if OPENSSL_VERSION_NUMBER < OPENSSL_VERSION_110
+        SSL_CTX_set_options (ctx,SSL_OP_NO_SSLv2|SSL_OP_NO_SSLv3|SSL_OP_NO_COMPRESSION);
+#else
+        SSL_CTX_set_min_proto_version(ctx, TLS1_VERSION);
+# if defined(TLS_MAX_VERSION)
+        SSL_CTX_set_max_proto_version(ctx, TLS_MAX_VERSION);
+# elif defined(TLS1_3_VERSION)
+        SSL_CTX_set_max_proto_version(ctx, TLS1_3_VERSION);
+# elif defined(TLS1_2_VERSION)
+        SSL_CTX_set_max_proto_version(ctx, TLS1_2_VERSION);
+# endif
+#endif
+    }
+
+    if(mode)
+        SSL_CTX_set_mode(ctx, mode);
+
+    return ctx;
+}
+
+/**
+ * Initialize OpenSSL server
+ *
+ * Starts the server context with TLS 1.2 and load the certificate.
+ *
+ * @return It returns the context on success or NULL otherwise
+ */
+static SSL_CTX * netdata_ssl_create_server_ctx(unsigned long mode) {
+    SSL_CTX *ctx;
+    char lerror[512];
+	static int netdata_id_context = 1;
+
+    //TO DO: Confirm the necessity to check return for other OPENSSL function
+#if OPENSSL_VERSION_NUMBER < OPENSSL_VERSION_110
+	ctx = SSL_CTX_new(SSLv23_server_method());
+    if (!ctx) {
+		netdata_log_error("Cannot create a new SSL context, netdata won't encrypt communication");
+        return NULL;
+    }
+
+    SSL_CTX_use_certificate_file(ctx, netdata_ssl_security_cert, SSL_FILETYPE_PEM);
+#else
+    ctx = SSL_CTX_new(TLS_server_method());
+    if (!ctx) {
+        netdata_log_error("Cannot create a new SSL context, netdata won't encrypt communication");
+        return NULL;
+    }
+
+    SSL_CTX_use_certificate_chain_file(ctx, netdata_ssl_security_cert);
+#endif
+
+#if OPENSSL_VERSION_NUMBER < OPENSSL_VERSION_110
+    SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2|SSL_OP_NO_SSLv3|SSL_OP_NO_COMPRESSION);
+#else
+    SSL_CTX_set_min_proto_version(ctx, TLS1_VERSION);
+    SSL_CTX_set_max_proto_version(ctx, netdata_ssl_select_tls_version(tls_version));
+
+    if(tls_ciphers  && strcmp(tls_ciphers, "none") != 0) {
+        if (!SSL_CTX_set_cipher_list(ctx, tls_ciphers)) {
+            netdata_log_error("SSL error. cannot set the cipher list");
+        }
+    }
+#endif
+
+    SSL_CTX_use_PrivateKey_file(ctx, netdata_ssl_security_key,SSL_FILETYPE_PEM);
+
+    if (!SSL_CTX_check_private_key(ctx)) {
+        ERR_error_string_n(ERR_get_error(),lerror,sizeof(lerror));
+        netdata_log_error("SSL cannot check the private key: %s",lerror);
+        SSL_CTX_free(ctx);
+        return NULL;
+    }
+
+	SSL_CTX_set_session_id_context(ctx,(void*)&netdata_id_context,(unsigned int)sizeof(netdata_id_context));
+    SSL_CTX_set_info_callback(ctx, netdata_ssl_info_callback);
+
+#if (OPENSSL_VERSION_NUMBER < OPENSSL_VERSION_095)
+	SSL_CTX_set_verify_depth(ctx,1);
+#endif
+    netdata_log_debug(D_WEB_CLIENT,"SSL GLOBAL CONTEXT STARTED\n");
+
+    SSL_CTX_set_mode(ctx, mode);
+
+    return ctx;
+}
+
+/**
+ * Start SSL
+ *
+ * Call the correct function to start the SSL context.
+ *
+ * @param selector informs the context that must be initialized, the following list has the valid values:
+ *      NETDATA_SSL_CONTEXT_SERVER - the server context
+ *      NETDATA_SSL_CONTEXT_STREAMING - Starts the streaming context.
+ *      NETDATA_SSL_CONTEXT_EXPORTING - Starts the OpenTSDB context
+ */
+void netdata_ssl_initialize_ctx(int selector) {
+    static SPINLOCK sp = NETDATA_SPINLOCK_INITIALIZER;
+    spinlock_lock(&sp);
+
+    switch (selector) {
+        case NETDATA_SSL_WEB_SERVER_CTX: {
+            if(!netdata_ssl_web_server_ctx) {
+                struct stat statbuf;
+                if (stat(netdata_ssl_security_key, &statbuf) || stat(netdata_ssl_security_cert, &statbuf))
+                    netdata_log_info("To use encryption it is necessary to set \"ssl certificate\" and \"ssl key\" in [web] !\n");
+                else {
+                    netdata_ssl_web_server_ctx = netdata_ssl_create_server_ctx(
+                            SSL_MODE_ENABLE_PARTIAL_WRITE |
+                            SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER |
+                            // SSL_MODE_AUTO_RETRY |
+                            0);
+
+                    if(netdata_ssl_web_server_ctx && !netdata_ssl_validate_certificate)
+                        SSL_CTX_set_verify(netdata_ssl_web_server_ctx, SSL_VERIFY_NONE, NULL);
+                }
+            }
+            break;
+        }
+
+        case NETDATA_SSL_STREAMING_SENDER_CTX: {
+            if(!netdata_ssl_streaming_sender_ctx) {
+                //This is necessary for the stream, because it is working sometimes with nonblock socket.
+                //It returns the bitmask after to change, there is not any description of errors in the documentation
+                netdata_ssl_streaming_sender_ctx = netdata_ssl_create_client_ctx(
+                        SSL_MODE_ENABLE_PARTIAL_WRITE |
+                        SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER |
+                        // SSL_MODE_AUTO_RETRY |
+                        0
+                );
+
+                if(netdata_ssl_streaming_sender_ctx && !netdata_ssl_validate_certificate_sender)
+                    SSL_CTX_set_verify(netdata_ssl_streaming_sender_ctx, SSL_VERIFY_NONE, NULL);
+            }
+            break;
+        }
+
+        case NETDATA_SSL_EXPORTING_CTX: {
+            if(!netdata_ssl_exporting_ctx) {
+                netdata_ssl_exporting_ctx = netdata_ssl_create_client_ctx(0);
+
+                if(netdata_ssl_exporting_ctx && !netdata_ssl_validate_certificate)
+                    SSL_CTX_set_verify(netdata_ssl_exporting_ctx, SSL_VERIFY_NONE, NULL);
+            }
+            break;
+        }
+    }
+
+    spinlock_unlock(&sp);
+}
+
+/**
+ * Clean Open SSL
+ *
+ * Clean all the allocated contexts from netdata.
+ */
+void netdata_ssl_cleanup()
+{
+    if (netdata_ssl_web_server_ctx) {
+        SSL_CTX_free(netdata_ssl_web_server_ctx);
+        netdata_ssl_web_server_ctx = NULL;
+    }
+
+    if (netdata_ssl_streaming_sender_ctx) {
+        SSL_CTX_free(netdata_ssl_streaming_sender_ctx);
+        netdata_ssl_streaming_sender_ctx = NULL;
+    }
+
+    if (netdata_ssl_exporting_ctx) {
+        SSL_CTX_free(netdata_ssl_exporting_ctx);
+        netdata_ssl_exporting_ctx = NULL;
+    }
+
+#if OPENSSL_VERSION_NUMBER < OPENSSL_VERSION_110
+    ERR_free_strings();
+#endif
+}
+
+/**
+ * Test Certificate
+ *
+ * Check the certificate of Netdata parent
+ *
+ * @param ssl is the connection structure
+ *
+ * @return It returns 0 on success and -1 otherwise
+ */
+int security_test_certificate(SSL *ssl) {
+    X509* cert = SSL_get_peer_certificate(ssl);
+    int ret;
+    long status;
+    if (!cert) {
+        return -1;
+    }
+
+    status = SSL_get_verify_result(ssl);
+    if((X509_V_OK != status))
+    {
+        char error[512];
+        ERR_error_string_n(ERR_get_error(), error, sizeof(error));
+        netdata_log_error("SSL RFC4158 check:  We have a invalid certificate, the tests result with %ld and message %s", status, error);
+        ret = -1;
+    } else {
+        ret = 0;
+    }
+
+    return ret;
+}
+
+/**
+ * Location for context
+ *
+ * Case the user give us a directory with the certificates available and
+ * the Netdata parent certificate, we use this function to validate the certificate.
+ *
+ * @param ctx the context where the path will be set.
+ * @param file the file with Netdata parent certificate.
+ * @param path the directory where the certificates are stored.
+ *
+ * @return It returns 0 on success and -1 otherwise.
+ */
+int ssl_security_location_for_context(SSL_CTX *ctx, char *file, char *path) {
+    int load_custom = 1, load_default = 1;
+    if (file || path) {
+        if(!SSL_CTX_load_verify_locations(ctx, file, path)) {
+            netdata_log_info("Netdata can not verify custom CAfile or CApath for parent's SSL certificate, so it will use the default OpenSSL configuration to validate certificates!");
+            load_custom = 0;
+        }
+    }
+
+    if(!SSL_CTX_set_default_verify_paths(ctx)) {
+        netdata_log_info("Can not verify default OpenSSL configuration to validate certificates!");
+        load_default = 0;
+    }
+
+    if (load_custom  == 0 && load_default == 0)
+        return -1;
+
+    return 0;
+}
+#endif