/* * SPDX-License-Identifier: ISC * * Copyright (c) 2019-2022 Todd C. Miller * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /* * This is an open source non-commercial project. Dear PVS-Studio, please check it. * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com */ #include #ifdef SUDOERS_LOG_CLIENT #include #include #include #include #include #include #include #include #include #include #include #if defined(HAVE_STDINT_H) # include #elif defined(HAVE_INTTYPES_H) # include #endif #include #include #include #include #include #include #include #ifndef HAVE_GETADDRINFO # include "compat/getaddrinfo.h" #endif #if defined(HAVE_OPENSSL) # if defined(HAVE_WOLFSSL) # include # endif # include # include # include #endif /* HAVE_OPENSSL */ #define NEED_INET_NTOP /* to expose sudo_inet_ntop in sudo_compat.h */ #include "sudoers.h" #include "sudo_event.h" #include "sudo_eventlog.h" #include "sudo_iolog.h" #include "hostcheck.h" #include "log_client.h" #include "strlist.h" /* Shared between iolog.c and audit.c */ struct client_closure *client_closure; /* Server callback may redirect to client callback for TLS. */ static void client_msg_cb(int fd, int what, void *v); static void server_msg_cb(int fd, int what, void *v); static void connect_cb(int sock, int what, void *v) { int optval, ret, *errnump = v; socklen_t optlen = sizeof(optval); debug_decl(connect_cb, SUDOERS_DEBUG_UTIL); if (what == SUDO_PLUGIN_EV_TIMEOUT) { *errnump = ETIMEDOUT; } else { ret = getsockopt(sock, SOL_SOCKET, SO_ERROR, &optval, &optlen); *errnump = ret == 0 ? optval : errno; } debug_return; } /* * Like connect(2) but with a timeout. */ static int timed_connect(int sock, const struct sockaddr *addr, socklen_t addrlen, const struct timespec *timeout) { struct sudo_event_base *evbase = NULL; struct sudo_event *connect_event = NULL; int ret, errnum = 0; debug_decl(timed_connect, SUDOERS_DEBUG_UTIL); ret = connect(sock, addr, addrlen); if (ret == -1 && errno == EINPROGRESS) { evbase = sudo_ev_base_alloc(); connect_event = sudo_ev_alloc(sock, SUDO_PLUGIN_EV_WRITE, connect_cb, &errnum); if (evbase == NULL || connect_event == NULL) { sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory")); goto done; } if (sudo_ev_add(evbase, connect_event, timeout, false) == -1) { sudo_warnx("%s", U_("unable to add event to queue")); goto done; } if (sudo_ev_dispatch(evbase) == -1) { sudo_warn("%s", U_("error in event loop")); goto done; } if (errnum == 0) ret = 0; else errno = errnum; } done: sudo_ev_base_free(evbase); sudo_ev_free(connect_event); debug_return_int(ret); } #if defined(HAVE_OPENSSL) static int verify_peer_identity(int preverify_ok, X509_STORE_CTX *ctx) { HostnameValidationResult result; struct client_closure *closure; SSL *ssl; X509 *current_cert; X509 *peer_cert; debug_decl(verify_peer_identity, SUDOERS_DEBUG_UTIL); /* if pre-verification of the cert failed, just propagate that result back */ if (preverify_ok != 1) { debug_return_int(0); } /* since this callback is called for each cert in the chain, * check that current cert is the peer's certificate */ current_cert = X509_STORE_CTX_get_current_cert(ctx); peer_cert = X509_STORE_CTX_get0_cert(ctx); if (current_cert != peer_cert) { debug_return_int(1); } /* read out the attached object (closure) from the ssl connection object */ ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx()); closure = SSL_get_ex_data(ssl, 1); result = validate_hostname(peer_cert, closure->server_name, closure->server_ip, 0); switch(result) { case MatchFound: debug_return_int(1); default: debug_return_int(0); } } static bool tls_init(struct client_closure *closure) { const char *errstr; debug_decl(tls_init, SUDOERS_DEBUG_PLUGIN); /* Only attempt to initialize TLS once, the parameters don't change. */ if (closure->ssl_initialized) { if (closure->ssl == NULL) debug_return_bool(false); SSL_clear(closure->ssl); debug_return_bool(true); } closure->ssl_initialized = true; SSL_library_init(); OpenSSL_add_all_algorithms(); SSL_load_error_strings(); /* Create the ssl context and enforce TLS 1.2 or higher. */ if ((closure->ssl_ctx = SSL_CTX_new(TLS_method())) == NULL) { errstr = ERR_reason_error_string(ERR_get_error()); sudo_warnx(U_("Creation of new SSL_CTX object failed: %s"), errstr ? errstr : strerror(errno)); goto bad; } #ifdef HAVE_SSL_CTX_SET_MIN_PROTO_VERSION if (!SSL_CTX_set_min_proto_version(closure->ssl_ctx, TLS1_2_VERSION)) { errstr = ERR_reason_error_string(ERR_get_error()); sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO, "unable to restrict min. protocol version: %s", errstr ? errstr : strerror(errno)); goto bad; } #else SSL_CTX_set_options(closure->ssl_ctx, SSL_OP_NO_SSLv2|SSL_OP_NO_SSLv3|SSL_OP_NO_TLSv1|SSL_OP_NO_TLSv1_1); #endif /* Enable server cert verification if log_server_verify is set in sudoers */ if (closure->log_details->verify_server) { if (closure->log_details->ca_bundle != NULL) { if (SSL_CTX_load_verify_locations(closure->ssl_ctx, closure->log_details->ca_bundle, NULL) <= 0) { errstr = ERR_reason_error_string(ERR_get_error()); sudo_warnx(U_("%s: %s"), closure->log_details->ca_bundle, errstr ? errstr : strerror(errno)); sudo_warnx(U_("unable to load certificate authority bundle %s"), closure->log_details->ca_bundle); goto bad; } } else { if (!SSL_CTX_set_default_verify_paths(closure->ssl_ctx)) { errstr = ERR_reason_error_string(ERR_get_error()); sudo_warnx("SSL_CTX_set_default_verify_paths: %s", errstr ? errstr : strerror(errno)); goto bad; } } SSL_CTX_set_verify(closure->ssl_ctx, SSL_VERIFY_PEER, verify_peer_identity); } /* Load the client certificate file if it is set in sudoers. */ if (closure->log_details->cert_file != NULL) { if (!SSL_CTX_use_certificate_chain_file(closure->ssl_ctx, closure->log_details->cert_file)) { errstr = ERR_reason_error_string(ERR_get_error()); sudo_warnx(U_("%s: %s"), closure->log_details->cert_file, errstr ? errstr : strerror(errno)); sudo_warnx(U_("unable to load certificate %s"), closure->log_details->cert_file); goto bad; } if (closure->log_details->key_file == NULL) { /* No explicit key file set, try to use the cert file. */ closure->log_details->key_file = closure->log_details->cert_file; } if (!SSL_CTX_use_PrivateKey_file(closure->ssl_ctx, closure->log_details->key_file, SSL_FILETYPE_PEM) || !SSL_CTX_check_private_key(closure->ssl_ctx)) { errstr = ERR_reason_error_string(ERR_get_error()); sudo_warnx(U_("%s: %s"), closure->log_details->key_file, errstr ? errstr : strerror(errno)); sudo_warnx(U_("unable to load private key %s"), closure->log_details->key_file); goto bad; } } /* Create the SSL object and attach the closure. */ if ((closure->ssl = SSL_new(closure->ssl_ctx)) == NULL) { errstr = ERR_reason_error_string(ERR_get_error()); sudo_warnx(U_("Unable to allocate ssl object: %s"), errstr ? errstr : strerror(errno)); goto bad; } if (SSL_set_ex_data(closure->ssl, 1, closure) <= 0) { errstr = ERR_reason_error_string(ERR_get_error()); sudo_warnx(U_("Unable to attach user data to the ssl object: %s"), errstr ? errstr : strerror(errno)); goto bad; } debug_return_bool(true); bad: SSL_free(closure->ssl); closure->ssl = NULL; SSL_CTX_free(closure->ssl_ctx); closure->ssl_ctx = NULL; debug_return_bool(false); } struct tls_connect_closure { bool tls_conn_status; SSL *ssl; const char *host; const char *port; const struct timespec *timeout; struct sudo_event_base *evbase; struct sudo_event *tls_connect_ev; }; static void tls_connect_cb(int sock, int what, void *v) { struct tls_connect_closure *closure = v; const struct timespec *timeout = closure->timeout; int tls_con; debug_decl(tls_connect_cb, SUDOERS_DEBUG_UTIL); if (what == SUDO_PLUGIN_EV_TIMEOUT) { sudo_warnx("%s", U_("TLS handshake timeout occurred")); goto bad; } tls_con = SSL_connect(closure->ssl); if (tls_con == 1) { sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO, "TLS version: %s, negotiated cipher suite: %s", SSL_get_version(closure->ssl), SSL_get_cipher(closure->ssl)); closure->tls_conn_status = true; } else { const char *errstr; switch (SSL_get_error(closure->ssl, tls_con)) { /* TLS handshake is not finished, reschedule event */ case SSL_ERROR_WANT_READ: sudo_debug_printf(SUDO_DEBUG_NOTICE|SUDO_DEBUG_LINENO, "SSL_connect returns SSL_ERROR_WANT_READ"); if (what != SUDO_EV_READ) { if (sudo_ev_set(closure->tls_connect_ev, sock, SUDO_EV_READ, tls_connect_cb, closure) == -1) { sudo_warnx("%s", U_("unable to set event")); goto bad; } } if (sudo_ev_add(closure->evbase, closure->tls_connect_ev, timeout, false) == -1) { sudo_warnx("%s", U_("unable to add event to queue")); goto bad; } break; case SSL_ERROR_WANT_WRITE: sudo_debug_printf(SUDO_DEBUG_NOTICE|SUDO_DEBUG_LINENO, "SSL_connect returns SSL_ERROR_WANT_WRITE"); if (what != SUDO_EV_WRITE) { if (sudo_ev_set(closure->tls_connect_ev, sock, SUDO_EV_WRITE, tls_connect_cb, closure) == -1) { sudo_warnx("%s", U_("unable to set event")); goto bad; } } if (sudo_ev_add(closure->evbase, closure->tls_connect_ev, timeout, false) == -1) { sudo_warnx("%s", U_("unable to add event to queue")); goto bad; } break; case SSL_ERROR_SYSCALL: sudo_warnx(U_("TLS connection to %s:%s failed: %s"), closure->host, closure->port, strerror(errno)); goto bad; default: errstr = ERR_reason_error_string(ERR_get_error()); sudo_warnx(U_("TLS connection to %s:%s failed: %s"), closure->host, closure->port, errstr ? errstr : strerror(errno)); goto bad; } } debug_return; bad: /* Break out of tls connect event loop with an error. */ sudo_ev_loopbreak(closure->evbase); debug_return; } static bool tls_timed_connect(SSL *ssl, const char *host, const char *port, const struct timespec *timeout) { struct tls_connect_closure closure; debug_decl(tls_timed_connect, SUDOERS_DEBUG_UTIL); memset(&closure, 0, sizeof(closure)); closure.ssl = ssl; closure.host = host; closure.port = port; closure.timeout = timeout; closure.evbase = sudo_ev_base_alloc(); closure.tls_connect_ev = sudo_ev_alloc(SSL_get_fd(ssl), SUDO_PLUGIN_EV_WRITE, tls_connect_cb, &closure); if (closure.evbase == NULL || closure.tls_connect_ev == NULL) { sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory")); goto done; } if (sudo_ev_add(closure.evbase, closure.tls_connect_ev, timeout, false) == -1) { sudo_warnx("%s", U_("unable to add event to queue")); goto done; } if (sudo_ev_dispatch(closure.evbase) == -1) { sudo_warnx("%s", U_("error in event loop")); goto done; } done: if (closure.tls_connect_ev != NULL) sudo_ev_free(closure.tls_connect_ev); sudo_ev_base_free(closure.evbase); debug_return_bool(closure.tls_conn_status); } #endif /* HAVE_OPENSSL */ /* * Connect to specified host:port * If host has multiple addresses, the first one that connects is used. * Returns open socket or -1 on error. */ static int connect_server(const char *host, const char *port, bool tls, struct client_closure *closure, const char **reason) { const struct timespec *timeout = &closure->log_details->server_timeout; struct addrinfo hints, *res, *res0; const char *addr, *cause = NULL; int error, sock = -1; debug_decl(connect_server, SUDOERS_DEBUG_UTIL); #if !defined(HAVE_OPENSSL) if (tls) { errno = EPROTONOSUPPORT; sudo_warn("%s:%s(tls)", host, port); debug_return_int(-1); } #endif memset(&hints, 0, sizeof(hints)); hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_STREAM; error = getaddrinfo(host, port, &hints, &res0); if (error != 0) { sudo_warnx(U_("unable to look up %s:%s: %s"), host, port, gai_strerror(error)); debug_return_int(-1); } for (res = res0; res; res = res->ai_next) { int flags, save_errno; sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol); if (sock == -1) { cause = "socket"; continue; } flags = fcntl(sock, F_GETFL, 0); if (flags == -1 || fcntl(sock, F_SETFL, flags | O_NONBLOCK) == -1) { cause = "fcntl(O_NONBLOCK)"; save_errno = errno; close(sock); errno = save_errno; sock = -1; continue; } if (fcntl(sock, F_SETFD, FD_CLOEXEC) == -1) { cause = "fcntl(FD_CLOEXEC)"; save_errno = errno; close(sock); errno = save_errno; sock = -1; continue; } if (closure->log_details->keepalive) { flags = 1; if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &flags, sizeof(flags)) == -1) { cause = "setsockopt(SO_KEEPALIVE)"; save_errno = errno; close(sock); errno = save_errno; sock = -1; continue; } } if (timed_connect(sock, res->ai_addr, res->ai_addrlen, timeout) == -1) { /* No need to set cause, caller's error message is sufficient. */ save_errno = errno; close(sock); errno = save_errno; sock = -1; continue; } switch (res->ai_family) { case AF_INET: addr = (char *)&((struct sockaddr_in *)res->ai_addr)->sin_addr; break; #ifdef HAVE_STRUCT_IN6_ADDR case AF_INET6: addr = (char *)&((struct sockaddr_in6 *)res->ai_addr)->sin6_addr; break; #endif default: cause = "ai_family"; save_errno = EAFNOSUPPORT; shutdown(sock, SHUT_RDWR); close(sock); errno = save_errno; sock = -1; continue; } if (inet_ntop(res->ai_family, addr, closure->server_ip, sizeof(closure->server_ip)) == NULL) { cause = "inet_ntop"; save_errno = errno; shutdown(sock, SHUT_RDWR); close(sock); errno = save_errno; sock = -1; continue; } free(closure->server_name); if ((closure->server_name = strdup(host)) == NULL) { cause = "strdup"; save_errno = errno; shutdown(sock, SHUT_RDWR); close(sock); errno = save_errno; sock = -1; continue; } #if defined(HAVE_OPENSSL) if (tls) { if (!tls_init(closure) || !SSL_set_fd(closure->ssl, sock)) { cause = U_("TLS initialization was unsuccessful"); save_errno = errno; shutdown(sock, SHUT_RDWR); close(sock); errno = save_errno; sock = -1; continue; } /* Perform TLS handshake. */ if (!tls_timed_connect(closure->ssl, host, port, timeout)) { cause = U_("TLS handshake was unsuccessful"); save_errno = errno; shutdown(sock, SHUT_RDWR); close(sock); errno = save_errno; sock = -1; continue; } } else { /* No TLS for this connection, make sure it is not initialized. */ SSL_free(closure->ssl); closure->ssl = NULL; SSL_CTX_free(closure->ssl_ctx); closure->ssl_ctx = NULL; } #endif /* HAVE_OPENSSL */ break; /* success */ } freeaddrinfo(res0); if (sock == -1) *reason = cause; debug_return_int(sock); } /* * Connect to the first server in the list. * Stores socket in closure with O_NONBLOCK and close-on-exec flags set. * Returns true on success, else false. */ bool log_server_connect(struct client_closure *closure) { struct sudoers_string *server; char *host, *port, *copy = NULL; const char *cause = NULL; int sock; bool tls, ret = false; debug_decl(log_server_connect, SUDOERS_DEBUG_UTIL); STAILQ_FOREACH(server, closure->log_details->log_servers, entries) { free(copy); if ((copy = strdup(server->str)) == NULL) break; if (!iolog_parse_host_port(copy, &host, &port, &tls, DEFAULT_PORT, DEFAULT_PORT_TLS)) { sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO, "unable to parse %s", copy); continue; } sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO, "connecting to %s port %s%s", host, port, tls ? " (tls)" : ""); sock = connect_server(host, port, tls, closure, &cause); if (sock != -1) { if (closure->read_ev->set(closure->read_ev, sock, SUDO_PLUGIN_EV_READ|SUDO_PLUGIN_EV_PERSIST, server_msg_cb, closure) == -1) { cause = (U_("unable to add event to queue")); break; } if (closure->write_ev->set(closure->write_ev, sock, SUDO_PLUGIN_EV_WRITE|SUDO_PLUGIN_EV_PERSIST, client_msg_cb, closure) == -1) { cause = (U_("unable to add event to queue")); break; } /* success */ closure->sock = sock; ret = true; break; } } free(copy); if (!ret && cause != NULL) sudo_warn("%s", cause); debug_return_bool(ret); } /* * Free client closure and contents, not including log details. */ void client_closure_free(struct client_closure *closure) { struct connection_buffer *buf; debug_decl(client_closure_free, SUDOERS_DEBUG_UTIL); if (closure == NULL) debug_return; #if defined(HAVE_OPENSSL) /* Shut down the TLS connection cleanly and free SSL data. */ if (closure->ssl != NULL) { if (SSL_shutdown(closure->ssl) == 0) SSL_shutdown(closure->ssl); SSL_free(closure->ssl); } SSL_CTX_free(closure->ssl_ctx); #endif if (closure->sock != -1) { shutdown(closure->sock, SHUT_RDWR); close(closure->sock); } free(closure->server_name); while ((buf = TAILQ_FIRST(&closure->write_bufs)) != NULL) { TAILQ_REMOVE(&closure->write_bufs, buf, entries); free(buf->data); free(buf); } while ((buf = TAILQ_FIRST(&closure->free_bufs)) != NULL) { TAILQ_REMOVE(&closure->free_bufs, buf, entries); free(buf->data); free(buf); } if (closure->read_ev != NULL) closure->read_ev->free(closure->read_ev); if (closure->write_ev != NULL) closure->write_ev->free(closure->write_ev); free(closure->read_buf.data); free(closure->iolog_id); free(closure); debug_return; } static struct connection_buffer * get_free_buf(struct client_closure *closure) { struct connection_buffer *buf; debug_decl(get_free_buf, SUDOERS_DEBUG_UTIL); buf = TAILQ_FIRST(&closure->free_bufs); if (buf != NULL) TAILQ_REMOVE(&closure->free_bufs, buf, entries); else buf = calloc(1, sizeof(*buf)); debug_return_ptr(buf); } /* * Format a ClientMessage. * Appends the wire format message to the closure's write queue. * Returns true on success, false on failure. */ bool fmt_client_message(struct client_closure *closure, ClientMessage *msg) { struct connection_buffer *buf; uint32_t msg_len; bool ret = false; size_t len; debug_decl(fmt_client_message, SUDOERS_DEBUG_UTIL); if ((buf = get_free_buf(closure)) == NULL) { sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory")); goto done; } len = client_message__get_packed_size(msg); if (len > MESSAGE_SIZE_MAX) { sudo_warnx(U_("client message too large: %zu"), len); goto done; } /* Wire message size is used for length encoding, precedes message. */ msg_len = htonl((uint32_t)len); len += sizeof(msg_len); sudo_debug_printf(SUDO_DEBUG_INFO, "%s: new ClientMessage, %zu bytes", __func__, len); /* Resize buffer as needed. */ if (len > buf->size) { free(buf->data); buf->size = sudo_pow2_roundup(len); if ((buf->data = malloc(buf->size)) == NULL) { sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory")); buf->size = 0; goto done; } } memcpy(buf->data, &msg_len, sizeof(msg_len)); client_message__pack(msg, buf->data + sizeof(msg_len)); buf->len = len; TAILQ_INSERT_TAIL(&closure->write_bufs, buf, entries); buf = NULL; ret = true; done: if (buf != NULL) { free(buf->data); free(buf); } debug_return_bool(ret); } /* * Build and format a ClientHello wrapped in a ClientMessage. * Appends the wire format message to the closure's write queue. * Returns true on success, false on failure. */ static bool fmt_client_hello(struct client_closure *closure) { ClientMessage client_msg = CLIENT_MESSAGE__INIT; ClientHello hello_msg = CLIENT_HELLO__INIT; bool ret = false; debug_decl(fmt_client_hello, SUDOERS_DEBUG_UTIL); sudo_debug_printf(SUDO_DEBUG_INFO, "%s: sending ClientHello", __func__); /* Client name + version */ hello_msg.client_id = (char *)"sudoers " PACKAGE_VERSION; /* Schedule ClientMessage */ client_msg.u.hello_msg = &hello_msg; client_msg.type_case = CLIENT_MESSAGE__TYPE_HELLO_MSG; ret = fmt_client_message(closure, &client_msg); debug_return_bool(ret); } /* * Free an array of InfoMessage. * Does not free the actual contents, other than strlistval arrays. */ static void free_info_messages(InfoMessage **info_msgs, size_t n) { debug_decl(free_info_messages, SUDOERS_DEBUG_UTIL); if (info_msgs != NULL) { while (n-- != 0) { /* A strlist array is dynamically allocated. */ if (info_msgs[n]->value_case == INFO_MESSAGE__VALUE_STRLISTVAL) { free(info_msgs[n]->u.strlistval); } free(info_msgs[n]); } free(info_msgs); } debug_return; } static InfoMessage ** fmt_info_messages(struct client_closure *closure, struct eventlog *evlog, size_t *n_info_msgs) { InfoMessage__StringList *runargv = NULL; InfoMessage__StringList *runenv = NULL; InfoMessage **info_msgs = NULL; size_t info_msgs_size, n = 0; debug_decl(fmt_info_messages, SUDOERS_DEBUG_UTIL); /* Convert NULL-terminated vectors to StringList. */ if (evlog->argv != NULL) { if ((runargv = malloc(sizeof(*runargv))) == NULL) goto bad; info_message__string_list__init(runargv); runargv->strings = evlog->argv; while (runargv->strings[runargv->n_strings] != NULL) runargv->n_strings++; } if (evlog->envp != NULL) { if ((runenv = malloc(sizeof(*runenv))) == NULL) goto bad; info_message__string_list__init(runenv); runenv->strings = evlog->envp; while (runenv->strings[runenv->n_strings] != NULL) runenv->n_strings++; } /* XXX - realloc as needed instead of preallocating */ info_msgs_size = 24; info_msgs = calloc(info_msgs_size, sizeof(InfoMessage *)); if (info_msgs == NULL) goto bad; for (n = 0; n < info_msgs_size; n++) { info_msgs[n] = malloc(sizeof(InfoMessage)); if (info_msgs[n] == NULL) goto bad; info_message__init(info_msgs[n]); } #define fill_str(_n, _v) do { \ info_msgs[n]->key = (char *)(_n); \ info_msgs[n]->u.strval = (_v); \ info_msgs[n]->value_case = INFO_MESSAGE__VALUE_STRVAL; \ n++; \ } while (0) #define fill_strlist(_n, _v) do { \ info_msgs[n]->key = (char *)(_n); \ info_msgs[n]->u.strlistval = (_v); \ info_msgs[n]->value_case = INFO_MESSAGE__VALUE_STRLISTVAL; \ n++; \ } while (0) #define fill_num(_n, _v) do { \ info_msgs[n]->key = (char *)(_n); \ info_msgs[n]->u.numval = (_v); \ info_msgs[n]->value_case = INFO_MESSAGE__VALUE_NUMVAL; \ n++; \ } while (0) /* Fill in info_msgs */ n = 0; /* TODO: clientargv (not currently supported by API) */ /* TODO: clientpid */ /* TODO: clientppid */ /* TODO: clientsid */ fill_num("columns", evlog->columns); fill_str("command", evlog->command); fill_num("lines", evlog->lines); if (runargv != NULL) { fill_strlist("runargv", runargv); runargv = NULL; } if (evlog->runchroot != NULL) { fill_str("runchroot", evlog->runchroot); } if (evlog->runcwd != NULL) { fill_str("runcwd", evlog->runcwd); } if (runenv != NULL) { fill_strlist("runenv", runenv); runenv = NULL; } if (evlog->rungroup != NULL) { fill_num("rungid", evlog->rungid); fill_str("rungroup", evlog->rungroup); } /* TODO - rungids */ /* TODO - rungroups */ fill_num("runuid", evlog->runuid); fill_str("runuser", evlog->runuser); if (evlog->cwd != NULL) { fill_str("submitcwd", evlog->cwd); } /* TODO - submitenv */ /* TODO - submitgid */ /* TODO - submitgids */ /* TODO - submitgroup */ /* TODO - submitgroups */ fill_str("submithost", evlog->submithost); /* TODO - submituid */ fill_str("submituser", evlog->submituser); // if (evlog->ttyname != NULL) { fill_str("ttyname", evlog->ttyname); // } /* Free unused structs. */ while (info_msgs_size > n) free(info_msgs[--info_msgs_size]); *n_info_msgs = n; debug_return_ptr(info_msgs); bad: free_info_messages(info_msgs, n); free(runargv); free(runenv); *n_info_msgs = 0; debug_return_ptr(NULL); } /* * Build and format an AcceptMessage wrapped in a ClientMessage. * Appends the wire format message to the closure's write queue. * Returns true on success, false on failure. */ bool fmt_accept_message(struct client_closure *closure, struct eventlog *evlog) { ClientMessage client_msg = CLIENT_MESSAGE__INIT; AcceptMessage accept_msg = ACCEPT_MESSAGE__INIT; TimeSpec ts = TIME_SPEC__INIT; struct timespec now; bool ret = false; debug_decl(fmt_accept_message, SUDOERS_DEBUG_UTIL); /* * Fill in AcceptMessage and add it to ClientMessage. */ if (sudo_gettime_real(&now)) { sudo_warn("%s", U_("unable to get time of day")); debug_return_bool(false); } ts.tv_sec = now.tv_sec; ts.tv_nsec = now.tv_nsec; accept_msg.submit_time = &ts; /* Client will send IoBuffer messages. */ accept_msg.expect_iobufs = closure->log_io; accept_msg.info_msgs = fmt_info_messages(closure, evlog, &accept_msg.n_info_msgs); if (accept_msg.info_msgs == NULL) goto done; sudo_debug_printf(SUDO_DEBUG_INFO, "%s: sending AcceptMessage, array length %zu", __func__, accept_msg.n_info_msgs); /* Schedule ClientMessage */ client_msg.u.accept_msg = &accept_msg; client_msg.type_case = CLIENT_MESSAGE__TYPE_ACCEPT_MSG; ret = fmt_client_message(closure, &client_msg); done: free_info_messages(accept_msg.info_msgs, accept_msg.n_info_msgs); debug_return_bool(ret); } /* * Build and format a RejectMessage wrapped in a ClientMessage. * Appends the wire format message to the closure's write queue. * Returns true on success, false on failure. */ bool fmt_reject_message(struct client_closure *closure, struct eventlog *evlog) { ClientMessage client_msg = CLIENT_MESSAGE__INIT; RejectMessage reject_msg = REJECT_MESSAGE__INIT; TimeSpec ts = TIME_SPEC__INIT; struct timespec now; bool ret = false; debug_decl(fmt_reject_message, SUDOERS_DEBUG_UTIL); /* * Fill in RejectMessage and add it to ClientMessage. */ if (sudo_gettime_real(&now)) { sudo_warn("%s", U_("unable to get time of day")); debug_return_bool(false); } ts.tv_sec = now.tv_sec; ts.tv_nsec = now.tv_nsec; reject_msg.submit_time = &ts; /* Reason for rejecting the request. */ reject_msg.reason = (char *)closure->reason; reject_msg.info_msgs = fmt_info_messages(closure, evlog, &reject_msg.n_info_msgs); if (reject_msg.info_msgs == NULL) goto done; sudo_debug_printf(SUDO_DEBUG_INFO, "%s: sending RejectMessage, array length %zu", __func__, reject_msg.n_info_msgs); /* Schedule ClientMessage */ client_msg.u.reject_msg = &reject_msg; client_msg.type_case = CLIENT_MESSAGE__TYPE_REJECT_MSG; ret = fmt_client_message(closure, &client_msg); done: free_info_messages(reject_msg.info_msgs, reject_msg.n_info_msgs); debug_return_bool(ret); } /* * Build and format an AlertMessage wrapped in a ClientMessage. * Appends the wire format message to the closure's write queue. * Returns true on success, false on failure. */ static bool fmt_alert_message(struct client_closure *closure, struct eventlog *evlog) { ClientMessage client_msg = CLIENT_MESSAGE__INIT; AlertMessage alert_msg = ALERT_MESSAGE__INIT; TimeSpec ts = TIME_SPEC__INIT; struct timespec now; bool ret = false; debug_decl(fmt_alert_message, SUDOERS_DEBUG_UTIL); /* * Fill in AlertMessage and add it to ClientMessage. */ if (sudo_gettime_real(&now)) { sudo_warn("%s", U_("unable to get time of day")); debug_return_bool(false); } ts.tv_sec = now.tv_sec; ts.tv_nsec = now.tv_nsec; alert_msg.alert_time = &ts; /* Reason for the alert. */ alert_msg.reason = (char *)closure->reason; alert_msg.info_msgs = fmt_info_messages(closure, evlog, &alert_msg.n_info_msgs); if (alert_msg.info_msgs == NULL) goto done; sudo_debug_printf(SUDO_DEBUG_INFO, "%s: sending AlertMessage, array length %zu", __func__, alert_msg.n_info_msgs); /* Schedule ClientMessage */ client_msg.u.alert_msg = &alert_msg; client_msg.type_case = CLIENT_MESSAGE__TYPE_ALERT_MSG; ret = fmt_client_message(closure, &client_msg); done: free_info_messages(alert_msg.info_msgs, alert_msg.n_info_msgs); debug_return_bool(ret); } /* * Build and format an AcceptMessage, RejectMessage or AlertMessage * (depending on initial_state) wrapped in a ClientMessage. * Appends the wire format message to the closure's write queue. * Returns true on success, false on failure. */ static bool fmt_initial_message(struct client_closure *closure) { bool ret = false; debug_decl(fmt_initial_message, SUDOERS_DEBUG_UTIL); closure->state = closure->initial_state; switch (closure->state) { case SEND_ACCEPT: /* Format and schedule AcceptMessage. */ if ((ret = fmt_accept_message(closure, closure->log_details->evlog))) { /* * Move read/write events back to main sudo event loop. * Server messages may occur at any time, so no timeout. * Write event will be re-enabled later. */ closure->read_ev->setbase(closure->read_ev, NULL); if (closure->read_ev->add(closure->read_ev, NULL) == -1) { sudo_warn("%s", U_("unable to add event to queue")); ret = false; } closure->write_ev->setbase(closure->write_ev, NULL); } break; case SEND_REJECT: /* Format and schedule RejectMessage. */ ret = fmt_reject_message(closure, closure->log_details->evlog); break; case SEND_ALERT: /* Format and schedule AlertMessage. */ ret = fmt_alert_message(closure, closure->log_details->evlog); break; default: sudo_warnx(U_("%s: unexpected state %d"), __func__, closure->state); break; } debug_return_bool(ret); } #ifdef notyet /* * Build and format a RestartMessage wrapped in a ClientMessage. * Appends the wire format message to the closure's write queue. * Returns true on success, false on failure. */ bool fmt_restart_message(struct client_closure *closure) { ClientMessage client_msg = CLIENT_MESSAGE__INIT; RestartMessage restart_msg = RESTART_MESSAGE__INIT; TimeSpec tv = TIME_SPEC__INIT; bool ret = false; debug_decl(fmt_restart_message, SUDOERS_DEBUG_UTIL); sudo_debug_printf(SUDO_DEBUG_INFO, "%s: sending RestartMessage, [%lld, %ld]", __func__, (long long)closure->restart->tv_sec, closure->restart->tv_nsec); tv.tv_sec = closure->restart->tv_sec; tv.tv_nsec = closure->restart->tv_nsec; restart_msg.resume_point = &tv; restart_msg.log_id = closure->iolog_id; /* Schedule ClientMessage */ client_msg.restart_msg = &restart_msg; client_msg.type_case = CLIENT_MESSAGE__TYPE_RESTART_MSG; ret = fmt_client_message(closure, &client_msg); debug_return_bool(ret); } #endif /* * Build and format an ExitMessage wrapped in a ClientMessage. * Appends the wire format message to the closure's write queue. * Returns true on success, false on failure. */ bool fmt_exit_message(struct client_closure *closure, int exit_status, int error) { ClientMessage client_msg = CLIENT_MESSAGE__INIT; ExitMessage exit_msg = EXIT_MESSAGE__INIT; TimeSpec ts = TIME_SPEC__INIT; char signame[SIG2STR_MAX]; bool ret = false; struct timespec run_time; debug_decl(fmt_exit_message, SUDOERS_DEBUG_UTIL); if (sudo_gettime_awake(&run_time) == -1) { sudo_warn("%s", U_("unable to get time of day")); goto done; } sudo_timespecsub(&run_time, &closure->start_time, &run_time); ts.tv_sec = run_time.tv_sec; ts.tv_nsec = run_time.tv_nsec; exit_msg.run_time = &ts; if (error != 0) { /* Error executing the command. */ exit_msg.error = strerror(error); } else { if (WIFEXITED(exit_status)) { exit_msg.exit_value = WEXITSTATUS(exit_status); } else if (WIFSIGNALED(exit_status)) { const int signo = WTERMSIG(exit_status); if (signo <= 0 || sig2str(signo, signame) == -1) { sudo_warnx(U_("%s: internal error, invalid signal %d"), __func__, signo); goto done; } exit_msg.signal = signame; if (WCOREDUMP(exit_status)) exit_msg.dumped_core = true; exit_msg.exit_value = WTERMSIG(exit_status) | 128; } else if (WIFSTOPPED(exit_status)) { const int signo = WSTOPSIG(exit_status); sudo_warnx(U_("%s: internal error, invalid signal %d"), __func__, signo); goto done; } else if (WIFCONTINUED(exit_status)) { sudo_warnx(U_("%s: internal error, invalid signal %d"), __func__, SIGCONT); goto done; } else { sudo_warnx(U_("%s: internal error, invalid exit status %d"), __func__, exit_status); goto done; } } sudo_debug_printf(SUDO_DEBUG_INFO, "%s: sending ExitMessage, exitval %d, error %s, signal %s, coredump %s", __func__, exit_msg.exit_value, exit_msg.error ? exit_msg.error : "", exit_msg.signal ? exit_msg.signal : "", exit_msg.dumped_core ? "yes" : "no"); /* Send ClientMessage */ client_msg.u.exit_msg = &exit_msg; client_msg.type_case = CLIENT_MESSAGE__TYPE_EXIT_MSG; if (!fmt_client_message(closure, &client_msg)) goto done; closure->state = SEND_EXIT; ret = true; done: debug_return_bool(ret); } /* * Build and format an IoBuffer wrapped in a ClientMessage. * Appends the wire format message to the closure's write queue. * Returns true on success, false on failure. */ bool fmt_io_buf(struct client_closure *closure, int type, const char *buf, unsigned int len, struct timespec *delay) { ClientMessage client_msg = CLIENT_MESSAGE__INIT; IoBuffer iobuf_msg = IO_BUFFER__INIT; TimeSpec ts = TIME_SPEC__INIT; bool ret = false; debug_decl(fmt_io_buf, SUDOERS_DEBUG_UTIL); /* Fill in IoBuffer. */ ts.tv_sec = delay->tv_sec; ts.tv_nsec = delay->tv_nsec; iobuf_msg.delay = &ts; iobuf_msg.data.data = (void *)buf; iobuf_msg.data.len = len; sudo_debug_printf(SUDO_DEBUG_INFO, "%s: sending IoBuffer length %zu, type %d, size %zu", __func__, iobuf_msg.data.len, type, io_buffer__get_packed_size(&iobuf_msg)); /* Schedule ClientMessage, it doesn't matter which IoBuffer we set. */ client_msg.u.ttyout_buf = &iobuf_msg; client_msg.type_case = type; if (!fmt_client_message(closure, &client_msg)) goto done; ret = true; done: debug_return_bool(ret); } /* * Build and format a ChangeWindowSize message wrapped in a ClientMessage. * Appends the wire format message to the closure's write queue. * Returns true on success, false on failure. */ bool fmt_winsize(struct client_closure *closure, unsigned int lines, unsigned int cols, struct timespec *delay) { ClientMessage client_msg = CLIENT_MESSAGE__INIT; ChangeWindowSize winsize_msg = CHANGE_WINDOW_SIZE__INIT; TimeSpec ts = TIME_SPEC__INIT; bool ret = false; debug_decl(fmt_winsize, SUDOERS_DEBUG_UTIL); /* Fill in ChangeWindowSize message. */ ts.tv_sec = delay->tv_sec; ts.tv_nsec = delay->tv_nsec; winsize_msg.delay = &ts; winsize_msg.rows = lines; winsize_msg.cols = cols; sudo_debug_printf(SUDO_DEBUG_INFO, "%s: sending ChangeWindowSize, %dx%d", __func__, winsize_msg.rows, winsize_msg.cols); /* Send ClientMessage */ client_msg.u.winsize_event = &winsize_msg; client_msg.type_case = CLIENT_MESSAGE__TYPE_WINSIZE_EVENT; if (!fmt_client_message(closure, &client_msg)) goto done; ret = true; done: debug_return_bool(ret); } /* * Build and format a CommandSuspend message wrapped in a ClientMessage. * Appends the wire format message to the closure's write queue. * Returns true on success, false on failure. */ bool fmt_suspend(struct client_closure *closure, const char *signame, struct timespec *delay) { ClientMessage client_msg = CLIENT_MESSAGE__INIT; CommandSuspend suspend_msg = COMMAND_SUSPEND__INIT; TimeSpec ts = TIME_SPEC__INIT; bool ret = false; debug_decl(fmt_suspend, SUDOERS_DEBUG_UTIL); /* Fill in CommandSuspend message. */ ts.tv_sec = delay->tv_sec; ts.tv_nsec = delay->tv_nsec; suspend_msg.delay = &ts; suspend_msg.signal = (char *)signame; sudo_debug_printf(SUDO_DEBUG_INFO, "%s: sending CommandSuspend, SIG%s", __func__, suspend_msg.signal); /* Send ClientMessage */ client_msg.u.suspend_event = &suspend_msg; client_msg.type_case = CLIENT_MESSAGE__TYPE_SUSPEND_EVENT; if (!fmt_client_message(closure, &client_msg)) goto done; ret = true; done: debug_return_bool(ret); } /* * Additional work to do after a ClientMessage was sent to the server. * Advances state and formats the next ClientMessage (if any). * XXX - better name */ static bool client_message_completion(struct client_closure *closure) { debug_decl(client_message_completion, SUDOERS_DEBUG_UTIL); sudo_debug_printf(SUDO_DEBUG_INFO, "%s: state %d", __func__, closure->state); switch (closure->state) { case RECV_HELLO: /* Waiting for ServerHello, nothing else to do. */ break; case SEND_ALERT: case SEND_REJECT: /* Nothing else to send, we are done. */ closure->write_ev->del(closure->write_ev); closure->read_ev->del(closure->read_ev); closure->state = FINISHED; break; case SEND_ACCEPT: case SEND_RESTART: closure->state = SEND_IO; break; case SEND_IO: /* Arbitrary number of I/O log buffers, no state change. */ break; case SEND_EXIT: if (closure->log_io) { /* Done writing, just waiting for final commit point. */ closure->write_ev->del(closure->write_ev); closure->state = CLOSING; /* Enable timeout while waiting for final commit point. */ if (closure->read_ev->add(closure->read_ev, &closure->log_details->server_timeout) == -1) { sudo_warn("%s", U_("unable to add event to queue")); debug_return_bool(false); } } else { /* No commit point to wait for, we are done. */ closure->state = FINISHED; closure->read_ev->del(closure->read_ev); } break; default: sudo_warnx(U_("%s: unexpected state %d"), __func__, closure->state); debug_return_bool(false); } debug_return_bool(true); } /* * Read the ServerHello message from the log server. * We do this synchronously, since we don't want the command to run * before the log server connection is completely established. */ bool read_server_hello(struct client_closure *closure) { struct sudo_event_base *evbase = NULL; bool ret = false; debug_decl(read_server_hello, SUDOERS_DEBUG_UTIL); /* Get new event base so we can read ServerHello synchronously. */ evbase = sudo_ev_base_alloc(); if (evbase == NULL) { sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory")); goto done; } /* Write ClientHello. */ if (!fmt_client_hello(closure)) goto done; closure->write_ev->setbase(closure->write_ev, evbase); if (closure->write_ev->add(closure->write_ev, &closure->log_details->server_timeout) == -1) { sudo_warnx("%s", U_("unable to add event to queue")); goto done; } /* Read ServerHello. */ closure->read_ev->setbase(closure->read_ev, evbase); if (closure->read_ev->add(closure->read_ev, &closure->log_details->server_timeout) == -1) { sudo_warnx("%s", U_("unable to add event to queue")); goto done; } /* Read/write hello messages synchronously. */ if (sudo_ev_dispatch(evbase) == -1) { sudo_warnx("%s", U_("error in event loop")); goto done; } if (!sudo_ev_got_break(evbase)) ret = true; done: sudo_ev_base_free(evbase); debug_return_bool(ret); } /* * Respond to a ServerHello message from the server. * Returns true on success, false on error. */ static bool handle_server_hello(ServerHello *msg, struct client_closure *closure) { size_t n; debug_decl(handle_server_hello, SUDOERS_DEBUG_UTIL); if (closure->state != RECV_HELLO) { sudo_warnx(U_("%s: unexpected state %d"), __func__, closure->state); debug_return_bool(false); } /* Check that ServerHello is valid. */ if (msg->server_id == NULL || msg->server_id[0] == '\0') { sudo_warnx("%s", U_("invalid ServerHello")); debug_return_bool(false); } sudo_debug_printf(SUDO_DEBUG_INFO, "%s: server ID: %s", __func__, msg->server_id); /* TODO: handle redirect */ if (msg->redirect != NULL && msg->redirect[0] != '\0') { sudo_debug_printf(SUDO_DEBUG_INFO, "%s: redirect: %s", __func__, msg->redirect); } for (n = 0; n < msg->n_servers; n++) { sudo_debug_printf(SUDO_DEBUG_INFO, "%s: server %zu: %s", __func__, n + 1, msg->servers[n]); } /* Does the server support logging sub-commands in a session? */ closure->subcommands = msg->subcommands; debug_return_bool(true); } /* * Respond to a CommitPoint message from the server. * Returns true on success, false on error. */ static bool handle_commit_point(TimeSpec *commit_point, struct client_closure *closure) { debug_decl(handle_commit_point, SUDOERS_DEBUG_UTIL); /* Only valid after we have sent an IO buffer. */ if (closure->state < SEND_IO) { sudo_warnx(U_("%s: unexpected state %d"), __func__, closure->state); debug_return_bool(false); } closure->committed.tv_sec = commit_point->tv_sec; closure->committed.tv_nsec = commit_point->tv_nsec; sudo_debug_printf(SUDO_DEBUG_INFO, "%s: received [%lld, %d], elapsed [%lld, %ld], committed [%lld, %ld]", __func__, (long long)commit_point->tv_sec, commit_point->tv_nsec, (long long)closure->elapsed.tv_sec, closure->elapsed.tv_nsec, (long long)closure->committed.tv_sec, closure->committed.tv_nsec); if (closure->state == CLOSING) { if (sudo_timespeccmp(&closure->elapsed, &closure->committed, ==)) { /* Last commit point received, exit event loop. */ closure->state = FINISHED; closure->read_ev->del(closure->read_ev); } } debug_return_bool(true); } /* * Respond to a LogId message from the server. * Always returns true. */ static bool handle_log_id(char *id, struct client_closure *closure) { debug_decl(handle_log_id, SUDOERS_DEBUG_UTIL); sudo_debug_printf(SUDO_DEBUG_INFO, "%s: remote log ID: %s", __func__, id); if (closure->iolog_id != NULL) { if ((closure->iolog_id = strdup(id)) == NULL) sudo_fatal(U_("%s: %s"), __func__, U_("unable to allocate memory")); } debug_return_bool(true); } /* * Respond to a ServerError message from the server. * Always returns false. */ static bool handle_server_error(char *errmsg, struct client_closure *closure) { debug_decl(handle_server_error, SUDOERS_DEBUG_UTIL); sudo_warnx(U_("error message received from server: %s"), errmsg); debug_return_bool(false); } /* * Respond to a ServerAbort message from the server. * Always returns false. */ static bool handle_server_abort(char *errmsg, struct client_closure *closure) { debug_decl(handle_server_abort, SUDOERS_DEBUG_UTIL); sudo_warnx(U_("abort message received from server: %s"), errmsg); debug_return_bool(false); } /* * Respond to a ServerMessage from the server. * Returns true on success, false on error. */ static bool handle_server_message(uint8_t *buf, size_t len, struct client_closure *closure) { ServerMessage *msg; bool ret = false; debug_decl(handle_server_message, SUDOERS_DEBUG_UTIL); sudo_debug_printf(SUDO_DEBUG_INFO, "%s: unpacking ServerMessage", __func__); msg = server_message__unpack(NULL, len, buf); if (msg == NULL) { sudo_warnx(U_("unable to unpack %s size %zu"), "ServerMessage", len); debug_return_bool(false); } switch (msg->type_case) { case SERVER_MESSAGE__TYPE_HELLO: if (handle_server_hello(msg->u.hello, closure)) { if ((ret = fmt_initial_message(closure))) { if (closure->write_ev->add(closure->write_ev, &closure->log_details->server_timeout) == -1) { sudo_warn("%s", U_("unable to add event to queue")); ret = false; } } } break; case SERVER_MESSAGE__TYPE_COMMIT_POINT: ret = handle_commit_point(msg->u.commit_point, closure); break; case SERVER_MESSAGE__TYPE_LOG_ID: ret = handle_log_id(msg->u.log_id, closure); break; case SERVER_MESSAGE__TYPE_ERROR: ret = handle_server_error(msg->u.error, closure); closure->state = ERROR; break; case SERVER_MESSAGE__TYPE_ABORT: ret = handle_server_abort(msg->u.abort, closure); closure->state = ERROR; break; default: sudo_warnx(U_("%s: unexpected type_case value %d"), __func__, msg->type_case); break; } server_message__free_unpacked(msg, NULL); debug_return_bool(ret); } /* * Expand buf as needed or just reset it. * XXX - share with logsrvd/sendlog */ static bool expand_buf(struct connection_buffer *buf, unsigned int needed) { void *newdata; debug_decl(expand_buf, SUDOERS_DEBUG_UTIL); if (buf->size < needed) { /* Expand buffer. */ needed = sudo_pow2_roundup(needed); if ((newdata = malloc(needed)) == NULL) { sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory")); debug_return_bool(false); } if (buf->off > 0) memcpy(newdata, buf->data + buf->off, buf->len - buf->off); free(buf->data); buf->data = newdata; buf->size = needed; } else { /* Just reset existing buffer. */ if (buf->off > 0) { memmove(buf->data, buf->data + buf->off, buf->len - buf->off); } } buf->len -= buf->off; buf->off = 0; debug_return_bool(true); } /* * Read and unpack a ServerMessage (read callback). */ static void server_msg_cb(int fd, int what, void *v) { struct client_closure *closure = v; struct connection_buffer *buf = &closure->read_buf; ssize_t nread; uint32_t msg_len; debug_decl(server_msg_cb, SUDOERS_DEBUG_UTIL); /* For TLS we may need to read as part of SSL_write(). */ if (closure->write_instead_of_read) { closure->write_instead_of_read = false; client_msg_cb(fd, what, v); debug_return; } if (what == SUDO_PLUGIN_EV_TIMEOUT) { sudo_debug_printf(SUDO_DEBUG_INFO, "%s: timed out reading from server", __func__); goto bad; } sudo_debug_printf(SUDO_DEBUG_INFO, "%s: reading ServerMessage", __func__); #if defined(HAVE_OPENSSL) if (closure->ssl != NULL) { nread = SSL_read(closure->ssl, buf->data + buf->len, buf->size - buf->len); if (nread <= 0) { const char *errstr; int err; switch (SSL_get_error(closure->ssl, nread)) { case SSL_ERROR_ZERO_RETURN: /* TLS connection shutdown cleanly */ sudo_debug_printf(SUDO_DEBUG_NOTICE|SUDO_DEBUG_LINENO, "TLS connection shut down cleanly"); nread = 0; break; case SSL_ERROR_WANT_READ: /* ssl wants to read more, read event is always active */ sudo_debug_printf(SUDO_DEBUG_NOTICE|SUDO_DEBUG_LINENO, "SSL_read returns SSL_ERROR_WANT_READ"); debug_return; case SSL_ERROR_WANT_WRITE: /* ssl wants to write, so schedule the write handler */ sudo_debug_printf(SUDO_DEBUG_NOTICE|SUDO_DEBUG_LINENO, "SSL_read returns SSL_ERROR_WANT_WRITE"); if (!closure->write_ev->pending(closure->write_ev, SUDO_PLUGIN_EV_WRITE, NULL)) { /* Enable a temporary write event. */ if (closure->write_ev->add(closure->write_ev, NULL) == -1) { sudo_warn("%s", U_("unable to add event to queue")); goto bad; } closure->temporary_write_event = true; } /* Redirect write event to finish SSL_read() */ closure->read_instead_of_write = true; debug_return; case SSL_ERROR_SSL: /* * For TLS 1.3, if the cert verify function on the server * returns an error, OpenSSL will send an internal error * alert when we read ServerHello. Convert to a more useful * message and hope that no actual internal error occurs. */ err = ERR_get_error(); #if !defined(HAVE_WOLFSSL) if (closure->state == RECV_HELLO && ERR_GET_REASON(err) == SSL_R_TLSV1_ALERT_INTERNAL_ERROR) { errstr = U_("host name does not match certificate"); } else #endif { errstr = ERR_reason_error_string(err); } sudo_warnx("%s", errstr ? errstr : strerror(errno)); goto bad; case SSL_ERROR_SYSCALL: if (nread == 0) sudo_warnx("%s", U_("lost connection to log server")); else sudo_warn("recv"); goto bad; default: errstr = ERR_reason_error_string(ERR_get_error()); sudo_warnx("recv: %s", errstr ? errstr : strerror(errno)); goto bad; } } } else #endif /* HAVE_OPENSSL */ { nread = recv(fd, buf->data + buf->len, buf->size - buf->len, 0); } sudo_debug_printf(SUDO_DEBUG_INFO, "%s: received %zd bytes from server", __func__, nread); switch (nread) { case -1: if (errno == EAGAIN) debug_return; sudo_warn("recv"); goto bad; case 0: sudo_warnx("%s", U_("lost connection to log server")); goto bad; default: break; } buf->len += nread; while (buf->len - buf->off >= sizeof(msg_len)) { /* Read wire message size (uint32_t in network byte order). */ memcpy(&msg_len, buf->data + buf->off, sizeof(msg_len)); msg_len = ntohl(msg_len); if (msg_len > MESSAGE_SIZE_MAX) { sudo_warnx(U_("server message too large: %u"), msg_len); goto bad; } if (msg_len + sizeof(msg_len) > buf->len - buf->off) { /* Incomplete message, we'll read the rest next time. */ if (!expand_buf(buf, msg_len + sizeof(msg_len))) goto bad; debug_return; } /* Parse ServerMessage, could be zero bytes. */ sudo_debug_printf(SUDO_DEBUG_INFO, "%s: parsing ServerMessage, size %u", __func__, msg_len); buf->off += sizeof(msg_len); if (!handle_server_message(buf->data + buf->off, msg_len, closure)) goto bad; buf->off += msg_len; } buf->len -= buf->off; buf->off = 0; debug_return; bad: if (closure->log_details->ignore_log_errors) { /* Disable plugin, the command continues. */ closure->disabled = true; closure->read_ev->del(closure->read_ev); } else { /* Break out of sudo event loop and kill the command. */ closure->read_ev->loopbreak(closure->read_ev); } debug_return; } /* * Send a ClientMessage to the server (write callback). */ static void client_msg_cb(int fd, int what, void *v) { struct client_closure *closure = v; struct connection_buffer *buf; ssize_t nwritten; debug_decl(client_msg_cb, SUDOERS_DEBUG_UTIL); /* For TLS we may need to write as part of SSL_read(). */ if (closure->read_instead_of_write) { closure->read_instead_of_write = false; /* Delete write event if it was only due to SSL_read(). */ if (closure->temporary_write_event) { closure->temporary_write_event = false; closure->write_ev->del(closure->write_ev); } server_msg_cb(fd, what, v); debug_return; } if (what == SUDO_PLUGIN_EV_TIMEOUT) { sudo_debug_printf(SUDO_DEBUG_INFO, "%s: timed out writing to server", __func__); goto bad; } if ((buf = TAILQ_FIRST(&closure->write_bufs)) == NULL) { sudo_warnx("%s", U_("missing write buffer")); goto bad; } sudo_debug_printf(SUDO_DEBUG_INFO, "%s: sending %u bytes to server", __func__, buf->len - buf->off); #if defined(HAVE_OPENSSL) if (closure->ssl != NULL) { nwritten = SSL_write(closure->ssl, buf->data + buf->off, buf->len - buf->off); if (nwritten <= 0) { const char *errstr; switch (SSL_get_error(closure->ssl, nwritten)) { case SSL_ERROR_ZERO_RETURN: /* TLS connection shutdown cleanly */ sudo_debug_printf(SUDO_DEBUG_NOTICE|SUDO_DEBUG_LINENO, "TLS connection shut down cleanly"); goto bad; case SSL_ERROR_WANT_READ: /* ssl wants to read, read event always active */ sudo_debug_printf(SUDO_DEBUG_NOTICE|SUDO_DEBUG_LINENO, "SSL_write returns SSL_ERROR_WANT_READ"); /* Redirect read event to finish SSL_write() */ closure->write_instead_of_read = true; debug_return; case SSL_ERROR_WANT_WRITE: /* ssl wants to write more, write event remains active */ sudo_debug_printf(SUDO_DEBUG_NOTICE|SUDO_DEBUG_LINENO, "SSL_write returns SSL_ERROR_WANT_WRITE"); debug_return; case SSL_ERROR_SSL: errstr = ERR_reason_error_string(ERR_get_error()); sudo_warnx("%s", errstr ? errstr : strerror(errno)); goto bad; case SSL_ERROR_SYSCALL: sudo_warn("send"); goto bad; default: errstr = ERR_reason_error_string(ERR_get_error()); sudo_warnx("send: %s", errstr ? errstr : strerror(errno)); goto bad; } } } else #endif /* HAVE_OPENSSL */ { nwritten = send(fd, buf->data + buf->off, buf->len - buf->off, 0); } if (nwritten == -1) { sudo_warn("send"); goto bad; } buf->off += nwritten; if (buf->off == buf->len) { /* sent entire message, move buf to free list */ sudo_debug_printf(SUDO_DEBUG_INFO, "%s: finished sending %u bytes to server", __func__, buf->len); buf->off = 0; buf->len = 0; TAILQ_REMOVE(&closure->write_bufs, buf, entries); TAILQ_INSERT_TAIL(&closure->free_bufs, buf, entries); if (TAILQ_EMPTY(&closure->write_bufs)) { /* Write queue empty, check for state change. */ closure->write_ev->del(closure->write_ev); if (!client_message_completion(closure)) goto bad; } } debug_return; bad: if (closure->log_details->ignore_log_errors) { /* Disable plugin, the command continues. */ closure->disabled = true; closure->write_ev->del(closure->read_ev); closure->write_ev->del(closure->write_ev); } else { /* Break out of sudo event loop and kill the command. */ closure->write_ev->loopbreak(closure->write_ev); } debug_return; } /* * Allocate and initialize a new client closure */ static struct client_closure * client_closure_alloc(struct log_details *details, struct timespec *now, bool log_io, enum client_state initial_state, const char *reason) { struct client_closure *closure; debug_decl(client_closure_alloc, SUDOERS_DEBUG_UTIL); if (plugin_event_alloc == NULL) { sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO, "plugin_event_alloc is not set"); debug_return_ptr(NULL); } if ((closure = calloc(1, sizeof(*closure))) == NULL) goto oom; closure->sock = -1; closure->log_io = log_io; closure->reason = reason; closure->state = RECV_HELLO; closure->initial_state = initial_state; closure->start_time.tv_sec = now->tv_sec; closure->start_time.tv_nsec = now->tv_nsec; TAILQ_INIT(&closure->write_bufs); TAILQ_INIT(&closure->free_bufs); closure->read_buf.size = 64 * 1024; closure->read_buf.data = malloc(closure->read_buf.size); if (closure->read_buf.data == NULL) goto oom; if ((closure->read_ev = plugin_event_alloc()) == NULL) goto oom; if ((closure->write_ev = plugin_event_alloc()) == NULL) goto oom; closure->log_details = details; debug_return_ptr(closure); oom: sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory")); client_closure_free(closure); debug_return_ptr(NULL); } struct client_closure * log_server_open(struct log_details *details, struct timespec *now, bool log_io, enum client_state initial_state, const char *reason) { struct client_closure *closure; static bool warned = false; debug_decl(log_server_open, SUDOERS_DEBUG_UTIL); closure = client_closure_alloc(details, now, log_io, initial_state, reason); if (closure == NULL) goto bad; /* Connect to log first available log server. */ if (!log_server_connect(closure)) { /* TODO: support offline logs if server unreachable */ if (!warned) { sudo_warnx("%s", U_("unable to connect to log server")); warned = true; } goto bad; } /* Read ServerHello synchronously or fail. */ if (read_server_hello(closure)) debug_return_ptr(closure); bad: client_closure_free(closure); debug_return_ptr(NULL); } /* * Send ExitMessage, wait for final commit message and free closure. */ bool log_server_close(struct client_closure *closure, int exit_status, int error) { struct sudo_event_base *evbase = NULL; bool ret = false; debug_decl(log_server_close, SUDOERS_DEBUG_UTIL); if (closure->disabled) goto done; /* Format and append an ExitMessage to the write queue. */ if (!fmt_exit_message(closure, exit_status, error)) goto done; /* * Create private event base and reparent the read/write events. * We cannot use the main sudo event loop as it has already exited. */ if ((evbase = sudo_ev_base_alloc()) == NULL) { sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory")); goto done; } /* Enable read event to receive server messages. */ closure->read_ev->setbase(closure->read_ev, evbase); if (closure->read_ev->add(closure->read_ev, &closure->log_details->server_timeout) == -1) { sudo_warn("%s", U_("unable to add event to queue")); goto done; } /* Enable the write event to write the ExitMessage. */ closure->write_ev->setbase(closure->write_ev, evbase); if (closure->write_ev->add(closure->write_ev, &closure->log_details->server_timeout) == -1) { sudo_warn("%s", U_("unable to add event to queue")); goto done; } /* Loop until queues are flushed and final commit point received. */ sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO, "flushing buffers and waiting for final commit point"); if (sudo_ev_dispatch(evbase) == -1 || sudo_ev_got_break(evbase)) { sudo_warnx("%s", U_("error in event loop")); goto done; } ret = true; done: sudo_ev_base_free(evbase); client_closure_free(closure); debug_return_bool(ret); } #endif /* SUDOERS_LOG_CLIENT */