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761b02d34f
This separats out the message handler from the functions that store or relay the message contents.
228 lines
7.3 KiB
C
228 lines
7.3 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2019-2021 Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef SUDO_LOGSRVD_H
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#define SUDO_LOGSRVD_H
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#if PROTOBUF_C_VERSION_NUMBER < 1003000
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# error protobuf-c version 1.30 or higher required
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#endif
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#include "config.h"
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#if defined(HAVE_OPENSSL)
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# include <openssl/ssl.h>
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#endif
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#include "logsrv_util.h"
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#include "tls_common.h"
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/* Default timeout value for server socket */
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#define DEFAULT_SOCKET_TIMEOUT_SEC 30
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/* How often to send an ACK to the client (commit point) in seconds */
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#define ACK_FREQUENCY 10
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/* Shutdown timeout (in seconds) in case client connections time out. */
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#define SHUTDOWN_TIMEO 10
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/*
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* Connection status.
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* In the RUNNING state we expect I/O log buffers.
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*/
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enum connection_status {
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INITIAL,
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CONNECTING,
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RUNNING,
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EXITED,
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SHUTDOWN,
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FINISHED,
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ERROR
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};
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/*
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* Per-connection relay state.
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*/
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struct relay_closure {
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struct server_address_list *relays;
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struct server_address *relay_addr;
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struct sudo_event *read_ev;
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struct sudo_event *write_ev;
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struct sudo_event *connect_ev;
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struct connection_buffer read_buf;
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struct connection_buffer_list write_bufs;
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struct peer_info relay_name;
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#if defined(HAVE_OPENSSL)
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struct tls_client_closure tls_client;
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#endif
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int sock;
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bool read_instead_of_write;
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bool write_instead_of_read;
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bool temporary_write_event;
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};
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/*
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* Per-connection state.
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*/
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struct connection_closure {
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TAILQ_ENTRY(connection_closure) entries;
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struct client_message_switch *cms;
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struct relay_closure *relay_closure;
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struct eventlog *evlog;
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struct timespec elapsed_time;
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struct connection_buffer read_buf;
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struct connection_buffer_list write_bufs;
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struct connection_buffer_list free_bufs;
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struct sudo_event_base *evbase;
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struct sudo_event *commit_ev;
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struct sudo_event *read_ev;
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struct sudo_event *write_ev;
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#if defined(HAVE_OPENSSL)
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struct sudo_event *ssl_accept_ev;
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SSL *ssl;
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#endif
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const char *errstr;
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FILE *journal;
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char *journal_path;
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struct iolog_file iolog_files[IOFD_MAX];
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int iolog_dir_fd;
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int sock;
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enum connection_status state;
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bool tls;
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bool log_io;
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bool store_first;
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bool read_instead_of_write;
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bool write_instead_of_read;
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bool temporary_write_event;
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#ifdef HAVE_STRUCT_IN6_ADDR
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char ipaddr[INET6_ADDRSTRLEN];
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#else
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char ipaddr[INET_ADDRSTRLEN];
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#endif
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};
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/* Client message switch. */
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struct client_message_switch {
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bool (*accept)(AcceptMessage *msg, uint8_t *buf, size_t len,
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struct connection_closure *closure);
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bool (*reject)(RejectMessage *msg, uint8_t *buf, size_t len,
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struct connection_closure *closure);
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bool (*exit)(ExitMessage *msg, uint8_t *buf, size_t len,
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struct connection_closure *closure);
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bool (*restart)(RestartMessage *msg, uint8_t *buf, size_t len,
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struct connection_closure *closure);
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bool (*alert)(AlertMessage *msg, uint8_t *buf, size_t len,
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struct connection_closure *closure);
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bool (*iobuf)(int iofd, IoBuffer *iobuf, uint8_t *buf, size_t len,
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struct connection_closure *closure);
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bool (*suspend)(CommandSuspend *msg, uint8_t *buf, size_t len,
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struct connection_closure *closure);
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bool (*winsize)(ChangeWindowSize *msg, uint8_t *buf, size_t len,
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struct connection_closure *closure);
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};
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union sockaddr_union {
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struct sockaddr sa;
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struct sockaddr_in sin;
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#ifdef HAVE_STRUCT_IN6_ADDR
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struct sockaddr_in6 sin6;
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#endif
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};
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/*
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* List of server addresses.
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*/
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struct server_address {
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TAILQ_ENTRY(server_address) entries;
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char *sa_host;
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char *sa_str;
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union sockaddr_union sa_un;
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socklen_t sa_size;
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bool tls;
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};
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TAILQ_HEAD(server_address_list, server_address);
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/*
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* List of active network listeners.
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*/
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struct listener {
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TAILQ_ENTRY(listener) entries;
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struct sudo_event *ev;
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int sock;
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bool tls;
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};
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TAILQ_HEAD(listener_list, listener);
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/* iolog_writer.c */
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struct eventlog *evlog_new(TimeSpec *submit_time, InfoMessage **info_msgs, size_t infolen, struct connection_closure *closure);
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bool iolog_init(AcceptMessage *msg, struct connection_closure *closure);
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bool iolog_restart(RestartMessage *msg, struct connection_closure *closure);
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int store_iobuf(int iofd, IoBuffer *msg, struct connection_closure *closure);
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int store_suspend(CommandSuspend *msg, struct connection_closure *closure);
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int store_winsize(ChangeWindowSize *msg, struct connection_closure *closure);
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void iolog_close_all(struct connection_closure *closure);
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void update_elapsed_time(TimeSpec *delta, struct timespec *elapsed);
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/* logsrvd.c */
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extern struct client_message_switch cms_local;
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bool start_protocol(struct connection_closure *closure);
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void connection_close(struct connection_closure *closure);
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bool schedule_commit_point(TimeSpec *commit_point, struct connection_closure *closure);
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bool fmt_log_id_message(const char *id, struct connection_closure *closure);
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bool schedule_error_message(const char *errstr, struct connection_closure *closure);
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struct connection_buffer *get_free_buf(size_t, struct connection_closure *closure);
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/* logsrvd_conf.c */
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bool logsrvd_conf_read(const char *path);
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const char *logsrvd_conf_iolog_dir(void);
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const char *logsrvd_conf_iolog_file(void);
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struct server_address_list *logsrvd_conf_server_listen_address(void);
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struct server_address_list *logsrvd_conf_relay_address(void);
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const char *logsrvd_conf_relay_dir(void);
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bool logsrvd_conf_relay_store_first(void);
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bool logsrvd_conf_relay_tcp_keepalive(void);
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bool logsrvd_conf_server_tcp_keepalive(void);
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const char *logsrvd_conf_pid_file(void);
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struct timespec *logsrvd_conf_server_timeout(void);
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struct timespec *logsrvd_conf_relay_connect_timeout(void);
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struct timespec *logsrvd_conf_relay_timeout(void);
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#if defined(HAVE_OPENSSL)
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bool logsrvd_conf_server_tls_check_peer(void);
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SSL_CTX *logsrvd_server_tls_ctx(void);
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bool logsrvd_conf_relay_tls_check_peer(void);
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SSL_CTX *logsrvd_relay_tls_ctx(void);
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#endif
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mode_t logsrvd_conf_iolog_mode(void);
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void address_list_addref(struct server_address_list *);
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void address_list_delref(struct server_address_list *);
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void logsrvd_conf_cleanup(void);
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/* logsrvd_journal.c */
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extern struct client_message_switch cms_journal;
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bool journal_open(struct connection_closure *closure);
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bool journal_finish(struct connection_closure *closure);
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bool journal_write(uint8_t *buf, size_t len, struct connection_closure *closure);
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/* logsrvd_relay.c */
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extern struct client_message_switch cms_relay;
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void relay_closure_free(struct relay_closure *relay_closure);
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bool connect_relay(struct connection_closure *closure);
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bool relay_shutdown(struct connection_closure *closure);
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#endif /* SUDO_LOGSRVD_H */
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