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Diffstat (limited to 'logsrvd/logsrvd.h')
| -rw-r--r-- | logsrvd/logsrvd.h | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/logsrvd/logsrvd.h b/logsrvd/logsrvd.h new file mode 100644 index 0000000..4d371f3 --- /dev/null +++ b/logsrvd/logsrvd.h @@ -0,0 +1,266 @@ +/* + * SPDX-License-Identifier: ISC + * + * Copyright (c) 2019-2022 Todd C. Miller <Todd.Miller@sudo.ws> + * + * 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. + */ + +#ifndef SUDO_LOGSRVD_H +#define SUDO_LOGSRVD_H + +#include "log_server.pb-c.h" +#if PROTOBUF_C_VERSION_NUMBER < 1003000 +# error protobuf-c version 1.30 or higher required +#endif + +#include <config.h> + +#if defined(HAVE_OPENSSL) +# if defined(HAVE_WOLFSSL) +# include <wolfssl/options.h> +# endif +# include <openssl/ssl.h> +# include <openssl/err.h> +#endif + +#include "logsrv_util.h" +#include "tls_common.h" + +/* Default timeout value for server socket */ +#define DEFAULT_SOCKET_TIMEOUT_SEC 30 + +/* How often to send an ACK to the client (commit point) in seconds */ +#define ACK_FREQUENCY 10 + +/* Shutdown timeout (in seconds) in case client connections time out. */ +#define SHUTDOWN_TIMEO 10 + +/* Template for mkstemp(3) when creating temporary files. */ +#define RELAY_TEMPLATE "relay.XXXXXXXX" + +/* + * Connection status. + * In the RUNNING state we expect I/O log buffers. + */ +enum connection_status { + INITIAL, + CONNECTING, + RUNNING, + EXITED, + SHUTDOWN, + FINISHED +}; + +/* + * Per-connection relay state. + */ +struct relay_closure { + struct server_address_list *relays; + struct server_address *relay_addr; + struct sudo_event *read_ev; + struct sudo_event *write_ev; + struct sudo_event *connect_ev; + struct connection_buffer read_buf; + struct connection_buffer_list write_bufs; + struct peer_info relay_name; +#if defined(HAVE_OPENSSL) + struct tls_client_closure tls_client; +#endif + int sock; + bool read_instead_of_write; + bool write_instead_of_read; + bool temporary_write_event; +}; + +/* + * Per-connection state. + */ +struct connection_closure { + TAILQ_ENTRY(connection_closure) entries; + struct client_message_switch *cms; + struct relay_closure *relay_closure; + struct eventlog *evlog; + struct timespec elapsed_time; + struct connection_buffer read_buf; + struct connection_buffer_list write_bufs; + struct connection_buffer_list free_bufs; + struct sudo_event_base *evbase; + struct sudo_event *commit_ev; + struct sudo_event *read_ev; + struct sudo_event *write_ev; +#if defined(HAVE_OPENSSL) + struct sudo_event *ssl_accept_ev; + SSL *ssl; +#endif + const char *errstr; + FILE *journal; + char *journal_path; + struct iolog_file iolog_files[IOFD_MAX]; + int iolog_dir_fd; + int sock; + enum connection_status state; + bool error; + bool tls; + bool log_io; + bool store_first; + bool read_instead_of_write; + bool write_instead_of_read; + bool temporary_write_event; +#ifdef HAVE_STRUCT_IN6_ADDR + char ipaddr[INET6_ADDRSTRLEN]; +#else + char ipaddr[INET_ADDRSTRLEN]; +#endif +}; + +/* Client message switch. */ +struct client_message_switch { + bool (*accept)(AcceptMessage *msg, uint8_t *buf, size_t len, + struct connection_closure *closure); + bool (*reject)(RejectMessage *msg, uint8_t *buf, size_t len, + struct connection_closure *closure); + bool (*exit)(ExitMessage *msg, uint8_t *buf, size_t len, + struct connection_closure *closure); + bool (*restart)(RestartMessage *msg, uint8_t *buf, size_t len, + struct connection_closure *closure); + bool (*alert)(AlertMessage *msg, uint8_t *buf, size_t len, + struct connection_closure *closure); + bool (*iobuf)(int iofd, IoBuffer *iobuf, uint8_t *buf, size_t len, + struct connection_closure *closure); + bool (*suspend)(CommandSuspend *msg, uint8_t *buf, size_t len, + struct connection_closure *closure); + bool (*winsize)(ChangeWindowSize *msg, uint8_t *buf, size_t len, + struct connection_closure *closure); +}; + +union sockaddr_union { + struct sockaddr sa; + struct sockaddr_in sin; +#ifdef HAVE_STRUCT_IN6_ADDR + struct sockaddr_in6 sin6; +#endif +}; + +/* + * List of server addresses. + */ +struct server_address { + TAILQ_ENTRY(server_address) entries; + char *sa_host; + char *sa_str; + union sockaddr_union sa_un; + socklen_t sa_size; + bool tls; +}; +TAILQ_HEAD(server_address_list, server_address); + +/* + * List of active network listeners. + */ +struct listener { + TAILQ_ENTRY(listener) entries; + struct sudo_event *ev; + int sock; + bool tls; +}; +TAILQ_HEAD(listener_list, listener); + +/* + * Queue of finished journal files to be relayed. + */ +struct outgoing_journal { + TAILQ_ENTRY(outgoing_journal) entries; + char *journal_path; +}; +TAILQ_HEAD(outgoing_journal_queue, outgoing_journal); + +/* iolog_writer.c */ +struct eventlog *evlog_new(TimeSpec *submit_time, InfoMessage **info_msgs, size_t infolen, struct connection_closure *closure); +bool iolog_init(AcceptMessage *msg, struct connection_closure *closure); +bool iolog_create(int iofd, struct connection_closure *closure); +void iolog_close_all(struct connection_closure *closure); +bool iolog_flush_all(struct connection_closure *closure); +bool iolog_rewrite(const struct timespec *target, struct connection_closure *closure); +void update_elapsed_time(TimeSpec *delta, struct timespec *elapsed); + +/* logsrvd.c */ +extern struct client_message_switch cms_local; +bool start_protocol(struct connection_closure *closure); +void connection_close(struct connection_closure *closure); +bool schedule_commit_point(TimeSpec *commit_point, struct connection_closure *closure); +bool fmt_log_id_message(const char *id, struct connection_closure *closure); +bool schedule_error_message(const char *errstr, struct connection_closure *closure); +struct connection_buffer *get_free_buf(size_t, struct connection_closure *closure); +struct connection_closure *connection_closure_alloc(int fd, bool tls, bool relay_only, struct sudo_event_base *base); + +/* logsrvd_conf.c */ +bool logsrvd_conf_read(const char *path); +const char *logsrvd_conf_iolog_dir(void); +const char *logsrvd_conf_iolog_file(void); +bool logsrvd_conf_iolog_log_passwords(void); +void *logsrvd_conf_iolog_passprompt_regex(void); +struct server_address_list *logsrvd_conf_server_listen_address(void); +struct server_address_list *logsrvd_conf_relay_address(void); +const char *logsrvd_conf_relay_dir(void); +bool logsrvd_conf_relay_store_first(void); +bool logsrvd_conf_relay_tcp_keepalive(void); +bool logsrvd_conf_server_tcp_keepalive(void); +const char *logsrvd_conf_pid_file(void); +struct timespec *logsrvd_conf_server_timeout(void); +struct timespec *logsrvd_conf_relay_connect_timeout(void); +struct timespec *logsrvd_conf_relay_timeout(void); +time_t logsrvd_conf_relay_retry_interval(void); +#if defined(HAVE_OPENSSL) +bool logsrvd_conf_server_tls_check_peer(void); +SSL_CTX *logsrvd_server_tls_ctx(void); +bool logsrvd_conf_relay_tls_check_peer(void); +SSL_CTX *logsrvd_relay_tls_ctx(void); +#endif +bool logsrvd_conf_log_exit(void); +uid_t logsrvd_conf_iolog_uid(void); +gid_t logsrvd_conf_iolog_gid(void); +mode_t logsrvd_conf_iolog_mode(void); +void address_list_addref(struct server_address_list *); +void address_list_delref(struct server_address_list *); +void logsrvd_conf_cleanup(void); +void logsrvd_warn_stderr(bool enabled); + +/* logsrvd_journal.c */ +extern struct client_message_switch cms_journal; + +/* logsrvd_local.c */ +extern struct client_message_switch cms_local; +bool set_random_drop(const char *dropstr); +bool store_accept_local(AcceptMessage *msg, uint8_t *buf, size_t len, struct connection_closure *closure); +bool store_reject_local(RejectMessage *msg, uint8_t *buf, size_t len, struct connection_closure *closure); +bool store_exit_local(ExitMessage *msg, uint8_t *buf, size_t len, struct connection_closure *closure); +bool store_restart_local(RestartMessage *msg, uint8_t *buf, size_t len, struct connection_closure *closure); +bool store_alert_local(AlertMessage *msg, uint8_t *buf, size_t len, struct connection_closure *closure); +bool store_iobuf_local(int iofd, IoBuffer *iobuf, uint8_t *buf, size_t len, struct connection_closure *closure); +bool store_winsize_local(ChangeWindowSize *msg, uint8_t *buf, size_t len, struct connection_closure *closure); +bool store_suspend_local(CommandSuspend *msg, uint8_t *buf, size_t len, struct connection_closure *closure); + +/* logsrvd_queue.c */ +bool logsrvd_queue_enable(time_t timeout, struct sudo_event_base *evbase); +bool logsrvd_queue_insert(struct connection_closure *closure); +bool logsrvd_queue_scan(struct sudo_event_base *evbase); +void logsrvd_queue_dump(void); + +/* logsrvd_relay.c */ +extern struct client_message_switch cms_relay; +void relay_closure_free(struct relay_closure *relay_closure); +bool connect_relay(struct connection_closure *closure); +bool relay_shutdown(struct connection_closure *closure); + +#endif /* SUDO_LOGSRVD_H */ |