/* * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the Apache License 2.0 (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ /* socket-related functions used by s_client and s_server */ #include #include #include #include #include #include /* * With IPv6, it looks like Digital has mixed up the proper order of * recursive header file inclusion, resulting in the compiler complaining * that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which is * needed to have fileno() declared correctly... So let's define u_int */ #if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT) # define __U_INT typedef unsigned int u_int; #endif #ifdef _WIN32 # include /* MSVC renamed some POSIX functions to have an underscore prefix. */ # ifdef _MSC_VER # define getpid _getpid # endif #endif #ifndef OPENSSL_NO_SOCK # include "apps.h" # include "s_apps.h" # include "internal/sockets.h" # if defined(__TANDEM) # if defined(OPENSSL_TANDEM_FLOSS) # include # endif # endif # include # include /* Keep track of our peer's address for the cookie callback */ BIO_ADDR *ourpeer = NULL; /* * init_client - helper routine to set up socket communication * @sock: pointer to storage of resulting socket. * @host: the hostname or path (for AF_UNIX) to connect to. * @port: the port to connect to (ignored for AF_UNIX). * @bindhost: source host or path (for AF_UNIX). * @bindport: source port (ignored for AF_UNIX). * @family: desired socket family, may be AF_INET, AF_INET6, AF_UNIX or * AF_UNSPEC * @type: socket type, must be SOCK_STREAM or SOCK_DGRAM * @protocol: socket protocol, e.g. IPPROTO_TCP or IPPROTO_UDP (or 0 for any) * @tfo: flag to enable TCP Fast Open * @doconn: whether we should call BIO_connect() on the socket * @ba_ret: BIO_ADDR for the remote peer, to be freed by caller * * This will create a socket and use it to connect to a host:port, or if * family == AF_UNIX, to the path found in host. * * If the host has more than one address, it will try them one by one until * a successful connection is established. The resulting socket will be * found in *sock on success, it will be given INVALID_SOCKET otherwise. * * Returns 1 on success, 0 on failure. */ int init_client(int *sock, const char *host, const char *port, const char *bindhost, const char *bindport, int family, int type, int protocol, int tfo, int doconn, BIO_ADDR **ba_ret) { BIO_ADDRINFO *res = NULL; BIO_ADDRINFO *bindaddr = NULL; const BIO_ADDRINFO *ai = NULL; const BIO_ADDRINFO *bi = NULL; int found = 0; int ret; int options = 0; if (tfo && ba_ret != NULL) *ba_ret = NULL; if (BIO_sock_init() != 1) return 0; ret = BIO_lookup_ex(host, port, BIO_LOOKUP_CLIENT, family, type, protocol, &res); if (ret == 0) { ERR_print_errors(bio_err); return 0; } if (bindhost != NULL || bindport != NULL) { ret = BIO_lookup_ex(bindhost, bindport, BIO_LOOKUP_CLIENT, family, type, protocol, &bindaddr); if (ret == 0) { ERR_print_errors (bio_err); goto out; } } ret = 0; for (ai = res; ai != NULL; ai = BIO_ADDRINFO_next(ai)) { /* Admittedly, these checks are quite paranoid, we should not get * anything in the BIO_ADDRINFO chain that we haven't * asked for. */ OPENSSL_assert((family == AF_UNSPEC || family == BIO_ADDRINFO_family(ai)) && (type == 0 || type == BIO_ADDRINFO_socktype(ai)) && (protocol == 0 || protocol == BIO_ADDRINFO_protocol(ai))); if (bindaddr != NULL) { for (bi = bindaddr; bi != NULL; bi = BIO_ADDRINFO_next(bi)) { if (BIO_ADDRINFO_family(bi) == BIO_ADDRINFO_family(ai)) break; } if (bi == NULL) continue; ++found; } *sock = BIO_socket(BIO_ADDRINFO_family(ai), BIO_ADDRINFO_socktype(ai), BIO_ADDRINFO_protocol(ai), 0); if (*sock == INVALID_SOCKET) { /* Maybe the kernel doesn't support the socket family, even if * BIO_lookup() added it in the returned result... */ continue; } if (bi != NULL) { if (!BIO_bind(*sock, BIO_ADDRINFO_address(bi), BIO_SOCK_REUSEADDR)) { BIO_closesocket(*sock); *sock = INVALID_SOCKET; break; } } #ifndef OPENSSL_NO_SCTP if (protocol == IPPROTO_SCTP) { /* * For SCTP we have to set various options on the socket prior to * connecting. This is done automatically by BIO_new_dgram_sctp(). * We don't actually need the created BIO though so we free it again * immediately. */ BIO *tmpbio = BIO_new_dgram_sctp(*sock, BIO_NOCLOSE); if (tmpbio == NULL) { ERR_print_errors(bio_err); return 0; } BIO_free(tmpbio); } #endif if (BIO_ADDRINFO_protocol(ai) == IPPROTO_TCP) { options |= BIO_SOCK_NODELAY; if (tfo) options |= BIO_SOCK_TFO; } if (doconn && !BIO_connect(*sock, BIO_ADDRINFO_address(ai), options)) { BIO_closesocket(*sock); *sock = INVALID_SOCKET; continue; } /* Save the address */ if (tfo || !doconn) *ba_ret = BIO_ADDR_dup(BIO_ADDRINFO_address(ai)); /* Success, don't try any more addresses */ break; } if (*sock == INVALID_SOCKET) { if (bindaddr != NULL && !found) { BIO_printf(bio_err, "Can't bind %saddress for %s%s%s\n", #ifdef AF_INET6 BIO_ADDRINFO_family(res) == AF_INET6 ? "IPv6 " : #endif BIO_ADDRINFO_family(res) == AF_INET ? "IPv4 " : BIO_ADDRINFO_family(res) == AF_UNIX ? "unix " : "", bindhost != NULL ? bindhost : "", bindport != NULL ? ":" : "", bindport != NULL ? bindport : ""); ERR_clear_error(); ret = 0; } ERR_print_errors(bio_err); } else { char *hostname = NULL; hostname = BIO_ADDR_hostname_string(BIO_ADDRINFO_address(ai), 1); if (hostname != NULL) { BIO_printf(bio_err, "Connecting to %s\n", hostname); OPENSSL_free(hostname); } /* Remove any stale errors from previous connection attempts */ ERR_clear_error(); ret = 1; } out: if (bindaddr != NULL) { BIO_ADDRINFO_free (bindaddr); } BIO_ADDRINFO_free(res); return ret; } void get_sock_info_address(int asock, char **hostname, char **service) { union BIO_sock_info_u info; if (hostname != NULL) *hostname = NULL; if (service != NULL) *service = NULL; if ((info.addr = BIO_ADDR_new()) != NULL && BIO_sock_info(asock, BIO_SOCK_INFO_ADDRESS, &info)) { if (hostname != NULL) *hostname = BIO_ADDR_hostname_string(info.addr, 1); if (service != NULL) *service = BIO_ADDR_service_string(info.addr, 1); } BIO_ADDR_free(info.addr); } int report_server_accept(BIO *out, int asock, int with_address, int with_pid) { int success = 1; if (BIO_printf(out, "ACCEPT") <= 0) return 0; if (with_address) { char *hostname, *service; get_sock_info_address(asock, &hostname, &service); success = hostname != NULL && service != NULL; if (success) success = BIO_printf(out, strchr(hostname, ':') == NULL ? /* IPv4 */ " %s:%s" : /* IPv6 */ " [%s]:%s", hostname, service) > 0; else (void)BIO_printf(out, "unknown:error\n"); OPENSSL_free(hostname); OPENSSL_free(service); } if (with_pid) success *= BIO_printf(out, " PID=%d", getpid()) > 0; success *= BIO_printf(out, "\n") > 0; (void)BIO_flush(out); return success; } /* * do_server - helper routine to perform a server operation * @accept_sock: pointer to storage of resulting socket. * @host: the hostname or path (for AF_UNIX) to connect to. * @port: the port to connect to (ignored for AF_UNIX). * @family: desired socket family, may be AF_INET, AF_INET6, AF_UNIX or * AF_UNSPEC * @type: socket type, must be SOCK_STREAM or SOCK_DGRAM * @cb: pointer to a function that receives the accepted socket and * should perform the communication with the connecting client. * @context: pointer to memory that's passed verbatim to the cb function. * @naccept: number of times an incoming connect should be accepted. If -1, * unlimited number. * * This will create a socket and use it to listen to a host:port, or if * family == AF_UNIX, to the path found in host, then start accepting * incoming connections and run cb on the resulting socket. * * 0 on failure, something other on success. */ int do_server(int *accept_sock, const char *host, const char *port, int family, int type, int protocol, do_server_cb cb, unsigned char *context, int naccept, BIO *bio_s_out, int tfo) { int asock = 0; int sock; int i; BIO_ADDRINFO *res = NULL; const BIO_ADDRINFO *next; int sock_family, sock_type, sock_protocol, sock_port; const BIO_ADDR *sock_address; int sock_family_fallback = AF_UNSPEC; const BIO_ADDR *sock_address_fallback = NULL; int sock_options = BIO_SOCK_REUSEADDR; int ret = 0; if (BIO_sock_init() != 1) return 0; if (!BIO_lookup_ex(host, port, BIO_LOOKUP_SERVER, family, type, protocol, &res)) { ERR_print_errors(bio_err); return 0; } /* Admittedly, these checks are quite paranoid, we should not get * anything in the BIO_ADDRINFO chain that we haven't asked for */ OPENSSL_assert((family == AF_UNSPEC || family == BIO_ADDRINFO_family(res)) && (type == 0 || type == BIO_ADDRINFO_socktype(res)) && (protocol == 0 || protocol == BIO_ADDRINFO_protocol(res))); sock_family = BIO_ADDRINFO_family(res); sock_type = BIO_ADDRINFO_socktype(res); sock_protocol = BIO_ADDRINFO_protocol(res); sock_address = BIO_ADDRINFO_address(res); next = BIO_ADDRINFO_next(res); if (tfo && sock_type == SOCK_STREAM) sock_options |= BIO_SOCK_TFO; #ifdef AF_INET6 if (sock_family == AF_INET6) sock_options |= BIO_SOCK_V6_ONLY; if (next != NULL && BIO_ADDRINFO_socktype(next) == sock_type && BIO_ADDRINFO_protocol(next) == sock_protocol) { if (sock_family == AF_INET && BIO_ADDRINFO_family(next) == AF_INET6) { /* In case AF_INET6 is returned but not supported by the * kernel, retry with the first detected address family */ sock_family_fallback = sock_family; sock_address_fallback = sock_address; sock_family = AF_INET6; sock_address = BIO_ADDRINFO_address(next); } else if (sock_family == AF_INET6 && BIO_ADDRINFO_family(next) == AF_INET) { sock_options &= ~BIO_SOCK_V6_ONLY; } } #endif asock = BIO_socket(sock_family, sock_type, sock_protocol, 0); if (asock == INVALID_SOCKET && sock_family_fallback != AF_UNSPEC) { asock = BIO_socket(sock_family_fallback, sock_type, sock_protocol, 0); sock_address = sock_address_fallback; } if (asock == INVALID_SOCKET || !BIO_listen(asock, sock_address, sock_options)) { BIO_ADDRINFO_free(res); ERR_print_errors(bio_err); if (asock != INVALID_SOCKET) BIO_closesocket(asock); goto end; } #ifndef OPENSSL_NO_SCTP if (protocol == IPPROTO_SCTP) { /* * For SCTP we have to set various options on the socket prior to * accepting. This is done automatically by BIO_new_dgram_sctp(). * We don't actually need the created BIO though so we free it again * immediately. */ BIO *tmpbio = BIO_new_dgram_sctp(asock, BIO_NOCLOSE); if (tmpbio == NULL) { BIO_closesocket(asock); ERR_print_errors(bio_err); goto end; } BIO_free(tmpbio); } #endif sock_port = BIO_ADDR_rawport(sock_address); BIO_ADDRINFO_free(res); res = NULL; if (!report_server_accept(bio_s_out, asock, sock_port == 0, 0)) { BIO_closesocket(asock); ERR_print_errors(bio_err); goto end; } if (accept_sock != NULL) *accept_sock = asock; for (;;) { char sink[64]; struct timeval timeout; fd_set readfds; if (type == SOCK_STREAM) { BIO_ADDR_free(ourpeer); ourpeer = BIO_ADDR_new(); if (ourpeer == NULL) { BIO_closesocket(asock); ERR_print_errors(bio_err); goto end; } do { sock = BIO_accept_ex(asock, ourpeer, 0); } while (sock < 0 && BIO_sock_should_retry(sock)); if (sock < 0) { ERR_print_errors(bio_err); BIO_closesocket(asock); break; } BIO_set_tcp_ndelay(sock, 1); i = (*cb)(sock, type, protocol, context); /* * If we ended with an alert being sent, but still with data in the * network buffer to be read, then calling BIO_closesocket() will * result in a TCP-RST being sent. On some platforms (notably * Windows) then this will result in the peer immediately abandoning * the connection including any buffered alert data before it has * had a chance to be read. Shutting down the sending side first, * and then closing the socket sends TCP-FIN first followed by * TCP-RST. This seems to allow the peer to read the alert data. */ shutdown(sock, 1); /* SHUT_WR */ /* * We just said we have nothing else to say, but it doesn't mean * that the other side has nothing. It's even recommended to * consume incoming data. [In testing context this ensures that * alerts are passed on...] */ timeout.tv_sec = 0; timeout.tv_usec = 500000; /* some extreme round-trip */ do { FD_ZERO(&readfds); openssl_fdset(sock, &readfds); } while (select(sock + 1, &readfds, NULL, NULL, &timeout) > 0 && readsocket(sock, sink, sizeof(sink)) > 0); BIO_closesocket(sock); } else { i = (*cb)(asock, type, protocol, context); } if (naccept != -1) naccept--; if (i < 0 || naccept == 0) { BIO_closesocket(asock); ret = i; break; } } end: # ifdef AF_UNIX if (family == AF_UNIX) unlink(host); # endif BIO_ADDR_free(ourpeer); ourpeer = NULL; return ret; } void do_ssl_shutdown(SSL *ssl) { int ret; do { /* We only do unidirectional shutdown */ ret = SSL_shutdown(ssl); if (ret < 0) { switch (SSL_get_error(ssl, ret)) { case SSL_ERROR_WANT_READ: case SSL_ERROR_WANT_WRITE: case SSL_ERROR_WANT_ASYNC: case SSL_ERROR_WANT_ASYNC_JOB: /* We just do busy waiting. Nothing clever */ continue; } ret = 0; } } while (ret < 0); } #endif /* OPENSSL_NO_SOCK */