| /* |
| * Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the Apache License 2.0 (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <errno.h> |
| |
| #include "bio_local.h" |
| #include "internal/ktls.h" |
| #include "internal/bio_tfo.h" |
| |
| #include <openssl/err.h> |
| |
| #ifndef OPENSSL_NO_SOCK |
| # ifdef SO_MAXCONN |
| # define MAX_LISTEN SO_MAXCONN |
| # elif defined(SOMAXCONN) |
| # define MAX_LISTEN SOMAXCONN |
| # else |
| # define MAX_LISTEN 32 |
| # endif |
| |
| /*- |
| * BIO_socket - create a socket |
| * @domain: the socket domain (AF_INET, AF_INET6, AF_UNIX, ...) |
| * @socktype: the socket type (SOCK_STEAM, SOCK_DGRAM) |
| * @protocol: the protocol to use (IPPROTO_TCP, IPPROTO_UDP) |
| * @options: BIO socket options (currently unused) |
| * |
| * Creates a socket. This should be called before calling any |
| * of BIO_connect and BIO_listen. |
| * |
| * Returns the file descriptor on success or INVALID_SOCKET on failure. On |
| * failure errno is set, and a status is added to the OpenSSL error stack. |
| */ |
| int BIO_socket(int domain, int socktype, int protocol, int options) |
| { |
| int sock = -1; |
| |
| if (BIO_sock_init() != 1) |
| return INVALID_SOCKET; |
| |
| sock = socket(domain, socktype, protocol); |
| if (sock == -1) { |
| ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
| "calling socket()"); |
| ERR_raise(ERR_LIB_BIO, BIO_R_UNABLE_TO_CREATE_SOCKET); |
| return INVALID_SOCKET; |
| } |
| # ifndef OPENSSL_NO_KTLS |
| { |
| /* |
| * The new socket is created successfully regardless of ktls_enable. |
| * ktls_enable doesn't change any functionality of the socket, except |
| * changing the setsockopt to enable the processing of ktls_start. |
| * Thus, it is not a problem to call it for non-TLS sockets. |
| */ |
| ktls_enable(sock); |
| } |
| # endif |
| |
| return sock; |
| } |
| |
| /*- |
| * BIO_connect - connect to an address |
| * @sock: the socket to connect with |
| * @addr: the address to connect to |
| * @options: BIO socket options |
| * |
| * Connects to the address using the given socket and options. |
| * |
| * Options can be a combination of the following: |
| * - BIO_SOCK_KEEPALIVE: enable regularly sending keep-alive messages. |
| * - BIO_SOCK_NONBLOCK: Make the socket non-blocking. |
| * - BIO_SOCK_NODELAY: don't delay small messages. |
| * - BIO_SOCK_TFO: use TCP Fast Open |
| * |
| * options holds BIO socket options that can be used |
| * You should call this for every address returned by BIO_lookup |
| * until the connection is successful. |
| * |
| * Returns 1 on success or 0 on failure. On failure errno is set |
| * and an error status is added to the OpenSSL error stack. |
| */ |
| int BIO_connect(int sock, const BIO_ADDR *addr, int options) |
| { |
| const int on = 1; |
| |
| if (sock == -1) { |
| ERR_raise(ERR_LIB_BIO, BIO_R_INVALID_SOCKET); |
| return 0; |
| } |
| |
| if (!BIO_socket_nbio(sock, (options & BIO_SOCK_NONBLOCK) != 0)) |
| return 0; |
| |
| if (options & BIO_SOCK_KEEPALIVE) { |
| if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, |
| (const void *)&on, sizeof(on)) != 0) { |
| ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
| "calling setsockopt()"); |
| ERR_raise(ERR_LIB_BIO, BIO_R_UNABLE_TO_KEEPALIVE); |
| return 0; |
| } |
| } |
| |
| if (options & BIO_SOCK_NODELAY) { |
| if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, |
| (const void *)&on, sizeof(on)) != 0) { |
| ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
| "calling setsockopt()"); |
| ERR_raise(ERR_LIB_BIO, BIO_R_UNABLE_TO_NODELAY); |
| return 0; |
| } |
| } |
| if (options & BIO_SOCK_TFO) { |
| # if defined(OSSL_TFO_CLIENT_FLAG) |
| # if defined(OSSL_TFO_SYSCTL_CLIENT) |
| int enabled = 0; |
| size_t enabledlen = sizeof(enabled); |
| |
| /* Later FreeBSD */ |
| if (sysctlbyname(OSSL_TFO_SYSCTL_CLIENT, &enabled, &enabledlen, NULL, 0) < 0) { |
| ERR_raise(ERR_LIB_BIO, BIO_R_TFO_NO_KERNEL_SUPPORT); |
| return 0; |
| } |
| /* Need to check for client flag */ |
| if (!(enabled & OSSL_TFO_CLIENT_FLAG)) { |
| ERR_raise(ERR_LIB_BIO, BIO_R_TFO_DISABLED); |
| return 0; |
| } |
| # elif defined(OSSL_TFO_SYSCTL) |
| int enabled = 0; |
| size_t enabledlen = sizeof(enabled); |
| |
| /* macOS */ |
| if (sysctlbyname(OSSL_TFO_SYSCTL, &enabled, &enabledlen, NULL, 0) < 0) { |
| ERR_raise(ERR_LIB_BIO, BIO_R_TFO_NO_KERNEL_SUPPORT); |
| return 0; |
| } |
| /* Need to check for client flag */ |
| if (!(enabled & OSSL_TFO_CLIENT_FLAG)) { |
| ERR_raise(ERR_LIB_BIO, BIO_R_TFO_DISABLED); |
| return 0; |
| } |
| # endif |
| # endif |
| # if defined(OSSL_TFO_CONNECTX) |
| sa_endpoints_t sae; |
| |
| memset(&sae, 0, sizeof(sae)); |
| sae.sae_dstaddr = BIO_ADDR_sockaddr(addr); |
| sae.sae_dstaddrlen = BIO_ADDR_sockaddr_size(addr); |
| if (connectx(sock, &sae, SAE_ASSOCID_ANY, |
| CONNECT_DATA_IDEMPOTENT | CONNECT_RESUME_ON_READ_WRITE, |
| NULL, 0, NULL, NULL) == -1) { |
| if (!BIO_sock_should_retry(-1)) { |
| ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
| "calling connectx()"); |
| ERR_raise(ERR_LIB_BIO, BIO_R_CONNECT_ERROR); |
| } |
| return 0; |
| } |
| # endif |
| # if defined(OSSL_TFO_CLIENT_SOCKOPT) |
| if (setsockopt(sock, IPPROTO_TCP, OSSL_TFO_CLIENT_SOCKOPT, |
| (const void *)&on, sizeof(on)) != 0) { |
| ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
| "calling setsockopt()"); |
| ERR_raise(ERR_LIB_BIO, BIO_R_UNABLE_TO_TFO); |
| return 0; |
| } |
| # endif |
| # if defined(OSSL_TFO_DO_NOT_CONNECT) |
| return 1; |
| # endif |
| } |
| |
| if (connect(sock, BIO_ADDR_sockaddr(addr), |
| BIO_ADDR_sockaddr_size(addr)) == -1) { |
| if (!BIO_sock_should_retry(-1)) { |
| ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
| "calling connect()"); |
| ERR_raise(ERR_LIB_BIO, BIO_R_CONNECT_ERROR); |
| } |
| return 0; |
| } |
| return 1; |
| } |
| |
| /*- |
| * BIO_bind - bind socket to address |
| * @sock: the socket to set |
| * @addr: local address to bind to |
| * @options: BIO socket options |
| * |
| * Binds to the address using the given socket and options. |
| * |
| * Options can be a combination of the following: |
| * - BIO_SOCK_REUSEADDR: Try to reuse the address and port combination |
| * for a recently closed port. |
| * |
| * When restarting the program it could be that the port is still in use. If |
| * you set to BIO_SOCK_REUSEADDR option it will try to reuse the port anyway. |
| * It's recommended that you use this. |
| */ |
| int BIO_bind(int sock, const BIO_ADDR *addr, int options) |
| { |
| # ifndef OPENSSL_SYS_WINDOWS |
| int on = 1; |
| # endif |
| |
| if (sock == -1) { |
| ERR_raise(ERR_LIB_BIO, BIO_R_INVALID_SOCKET); |
| return 0; |
| } |
| |
| # ifndef OPENSSL_SYS_WINDOWS |
| /* |
| * SO_REUSEADDR has different behavior on Windows than on |
| * other operating systems, don't set it there. |
| */ |
| if (options & BIO_SOCK_REUSEADDR) { |
| if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, |
| (const void *)&on, sizeof(on)) != 0) { |
| ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
| "calling setsockopt()"); |
| ERR_raise(ERR_LIB_BIO, BIO_R_UNABLE_TO_REUSEADDR); |
| return 0; |
| } |
| } |
| # endif |
| |
| if (bind(sock, BIO_ADDR_sockaddr(addr), BIO_ADDR_sockaddr_size(addr)) != 0) { |
| ERR_raise_data(ERR_LIB_SYS, get_last_socket_error() /* may be 0 */, |
| "calling bind()"); |
| ERR_raise(ERR_LIB_BIO, BIO_R_UNABLE_TO_BIND_SOCKET); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| /*- |
| * BIO_listen - Creates a listen socket |
| * @sock: the socket to listen with |
| * @addr: local address to bind to |
| * @options: BIO socket options |
| * |
| * Binds to the address using the given socket and options, then |
| * starts listening for incoming connections. |
| * |
| * Options can be a combination of the following: |
| * - BIO_SOCK_KEEPALIVE: enable regularly sending keep-alive messages. |
| * - BIO_SOCK_NONBLOCK: Make the socket non-blocking. |
| * - BIO_SOCK_NODELAY: don't delay small messages. |
| * - BIO_SOCK_REUSEADDR: Try to reuse the address and port combination |
| * for a recently closed port. |
| * - BIO_SOCK_V6_ONLY: When creating an IPv6 socket, make it listen only |
| * for IPv6 addresses and not IPv4 addresses mapped to IPv6. |
| * - BIO_SOCK_TFO: accept TCP fast open (set TCP_FASTOPEN) |
| * |
| * It's recommended that you set up both an IPv6 and IPv4 listen socket, and |
| * then check both for new clients that connect to it. You want to set up |
| * the socket as non-blocking in that case since else it could hang. |
| * |
| * Not all operating systems support IPv4 addresses on an IPv6 socket, and for |
| * others it's an option. If you pass the BIO_LISTEN_V6_ONLY it will try to |
| * create the IPv6 sockets to only listen for IPv6 connection. |
| * |
| * It could be that the first BIO_listen() call will listen to all the IPv6 |
| * and IPv4 addresses and that then trying to bind to the IPv4 address will |
| * fail. We can't tell the difference between already listening ourself to |
| * it and someone else listening to it when failing and errno is EADDRINUSE, so |
| * it's recommended to not give an error in that case if the first call was |
| * successful. |
| * |
| * When restarting the program it could be that the port is still in use. If |
| * you set to BIO_SOCK_REUSEADDR option it will try to reuse the port anyway. |
| * It's recommended that you use this. |
| */ |
| int BIO_listen(int sock, const BIO_ADDR *addr, int options) |
| { |
| int on = 1; |
| int socktype; |
| socklen_t socktype_len = sizeof(socktype); |
| |
| if (sock == -1) { |
| ERR_raise(ERR_LIB_BIO, BIO_R_INVALID_SOCKET); |
| return 0; |
| } |
| |
| if (getsockopt(sock, SOL_SOCKET, SO_TYPE, |
| (void *)&socktype, &socktype_len) != 0 |
| || socktype_len != sizeof(socktype)) { |
| ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
| "calling getsockopt()"); |
| ERR_raise(ERR_LIB_BIO, BIO_R_GETTING_SOCKTYPE); |
| return 0; |
| } |
| |
| if (!BIO_socket_nbio(sock, (options & BIO_SOCK_NONBLOCK) != 0)) |
| return 0; |
| |
| if (options & BIO_SOCK_KEEPALIVE) { |
| if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, |
| (const void *)&on, sizeof(on)) != 0) { |
| ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
| "calling setsockopt()"); |
| ERR_raise(ERR_LIB_BIO, BIO_R_UNABLE_TO_KEEPALIVE); |
| return 0; |
| } |
| } |
| |
| if (options & BIO_SOCK_NODELAY) { |
| if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, |
| (const void *)&on, sizeof(on)) != 0) { |
| ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
| "calling setsockopt()"); |
| ERR_raise(ERR_LIB_BIO, BIO_R_UNABLE_TO_NODELAY); |
| return 0; |
| } |
| } |
| |
| /* On OpenBSD it is always ipv6 only with ipv6 sockets thus read-only */ |
| # if defined(IPV6_V6ONLY) && !defined(__OpenBSD__) |
| if (BIO_ADDR_family(addr) == AF_INET6) { |
| /* |
| * Note: Windows default of IPV6_V6ONLY is ON, and Linux is OFF. |
| * Therefore we always have to use setsockopt here. |
| */ |
| on = options & BIO_SOCK_V6_ONLY ? 1 : 0; |
| if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, |
| (const void *)&on, sizeof(on)) != 0) { |
| ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
| "calling setsockopt()"); |
| ERR_raise(ERR_LIB_BIO, BIO_R_LISTEN_V6_ONLY); |
| return 0; |
| } |
| } |
| # endif |
| |
| if (!BIO_bind(sock, addr, options)) |
| return 0; |
| |
| if (socktype != SOCK_DGRAM && listen(sock, MAX_LISTEN) == -1) { |
| ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
| "calling listen()"); |
| ERR_raise(ERR_LIB_BIO, BIO_R_UNABLE_TO_LISTEN_SOCKET); |
| return 0; |
| } |
| |
| # if defined(OSSL_TFO_SERVER_SOCKOPT) |
| /* |
| * Must do it explicitly after listen() for macOS, still |
| * works fine on other OS's |
| */ |
| if ((options & BIO_SOCK_TFO) && socktype != SOCK_DGRAM) { |
| int q = OSSL_TFO_SERVER_SOCKOPT_VALUE; |
| # if defined(OSSL_TFO_CLIENT_FLAG) |
| # if defined(OSSL_TFO_SYSCTL_SERVER) |
| int enabled = 0; |
| size_t enabledlen = sizeof(enabled); |
| |
| /* Later FreeBSD */ |
| if (sysctlbyname(OSSL_TFO_SYSCTL_SERVER, &enabled, &enabledlen, NULL, 0) < 0) { |
| ERR_raise(ERR_LIB_BIO, BIO_R_TFO_NO_KERNEL_SUPPORT); |
| return 0; |
| } |
| /* Need to check for server flag */ |
| if (!(enabled & OSSL_TFO_SERVER_FLAG)) { |
| ERR_raise(ERR_LIB_BIO, BIO_R_TFO_DISABLED); |
| return 0; |
| } |
| # elif defined(OSSL_TFO_SYSCTL) |
| int enabled = 0; |
| size_t enabledlen = sizeof(enabled); |
| |
| /* Early FreeBSD, macOS */ |
| if (sysctlbyname(OSSL_TFO_SYSCTL, &enabled, &enabledlen, NULL, 0) < 0) { |
| ERR_raise(ERR_LIB_BIO, BIO_R_TFO_NO_KERNEL_SUPPORT); |
| return 0; |
| } |
| /* Need to check for server flag */ |
| if (!(enabled & OSSL_TFO_SERVER_FLAG)) { |
| ERR_raise(ERR_LIB_BIO, BIO_R_TFO_DISABLED); |
| return 0; |
| } |
| # endif |
| # endif |
| if (setsockopt(sock, IPPROTO_TCP, OSSL_TFO_SERVER_SOCKOPT, |
| (void *)&q, sizeof(q)) < 0) { |
| ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
| "calling setsockopt()"); |
| ERR_raise(ERR_LIB_BIO, BIO_R_UNABLE_TO_TFO); |
| return 0; |
| } |
| } |
| # endif |
| |
| return 1; |
| } |
| |
| /*- |
| * BIO_accept_ex - Accept new incoming connections |
| * @sock: the listening socket |
| * @addr: the BIO_ADDR to store the peer address in |
| * @options: BIO socket options, applied on the accepted socket. |
| * |
| */ |
| int BIO_accept_ex(int accept_sock, BIO_ADDR *addr_, int options) |
| { |
| socklen_t len; |
| int accepted_sock; |
| BIO_ADDR locaddr; |
| BIO_ADDR *addr = addr_ == NULL ? &locaddr : addr_; |
| |
| len = sizeof(*addr); |
| accepted_sock = accept(accept_sock, |
| BIO_ADDR_sockaddr_noconst(addr), &len); |
| if (accepted_sock == -1) { |
| if (!BIO_sock_should_retry(accepted_sock)) { |
| ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
| "calling accept()"); |
| ERR_raise(ERR_LIB_BIO, BIO_R_ACCEPT_ERROR); |
| } |
| return INVALID_SOCKET; |
| } |
| |
| if (!BIO_socket_nbio(accepted_sock, (options & BIO_SOCK_NONBLOCK) != 0)) { |
| closesocket(accepted_sock); |
| return INVALID_SOCKET; |
| } |
| |
| return accepted_sock; |
| } |
| |
| /*- |
| * BIO_closesocket - Close a socket |
| * @sock: the socket to close |
| */ |
| int BIO_closesocket(int sock) |
| { |
| if (sock < 0 || closesocket(sock) < 0) |
| return 0; |
| return 1; |
| } |
| #endif |
