#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if defined(linux) # include #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__) # include #else # include #endif #include #include "bbs.h" #include "inih/ini.h" extern struct bbs_config conf; extern struct user_record *gUser; int ssh_pid = -1; int bbs_pid = 0; void sigterm_handler(int s) { if (ssh_pid != -1) { kill(ssh_pid, SIGTERM); } remove(conf.pid_file); exit(0); } void sigchld_handler(int s) { // waitpid() might overwrite errno, so we save and restore it: int saved_errno = errno; while(waitpid(-1, NULL, WNOHANG) > 0); errno = saved_errno; } static int door_config_handler(void* user, const char* section, const char* name, const char* value) { struct bbs_config *conf = (struct bbs_config *)user; int i; for (i=0;idoor_count;i++) { if (strcasecmp(conf->doors[i]->name, section) == 0) { // found it if (strcasecmp(name, "key") == 0) { conf->doors[i]->key = value[0]; } else if (strcasecmp(name, "command") == 0) { conf->doors[i]->command = strdup(value); } else if (strcasecmp(name, "stdio") == 0) { if (strcasecmp(value, "true") == 0) { conf->doors[i]->stdio = 1; } else { conf->doors[i]->stdio = 0; } } return 1; } } if (conf->door_count == 0) { conf->doors = (struct door_config **)malloc(sizeof(struct door_config *)); } else { conf->doors = (struct door_config **)realloc(conf->doors, sizeof(struct door_config *) * (conf->door_count + 1)); } conf->doors[conf->door_count] = (struct door_config *)malloc(sizeof(struct door_config)); conf->doors[conf->door_count]->name = strdup(section); if (strcasecmp(name, "key") == 0) { conf->doors[conf->door_count]->key = value[0]; } else if (strcasecmp(name, "command") == 0) { conf->doors[conf->door_count]->command = strdup(value); } else if (strcasecmp(name, "stdio") == 0) { if (strcasecmp(value, "true") == 0) { conf->doors[conf->door_count]->stdio = 1; } else { conf->doors[conf->door_count]->stdio = 0; } } conf->door_count++; return 1; } static int file_sub_handler(void* user, const char* section, const char* name, const char* value) { struct file_directory *fd = (struct file_directory *)user; int i; if (strcasecmp(section, "main") == 0) { if (strcasecmp(name, "visible sec level") == 0) { fd->sec_level = atoi(value); } } else { // check if it's partially filled in for (i=0;ifile_sub_count;i++) { if (strcasecmp(fd->file_subs[i]->name, section) == 0) { if (strcasecmp(name, "upload sec level") == 0) { fd->file_subs[i]->upload_sec_level = atoi(value); } else if (strcasecmp(name, "download sec level") == 0) { fd->file_subs[i]->download_sec_level = atoi(value); } else if (strcasecmp(name, "database") == 0) { fd->file_subs[i]->database = strdup(value); } else if (strcasecmp(name, "upload path") == 0) { fd->file_subs[i]->upload_path = strdup(value); } return 1; } } if (fd->file_sub_count == 0) { fd->file_subs = (struct file_sub **)malloc(sizeof(struct file_sub *)); } else { fd->file_subs = (struct file_sub **)realloc(fd->file_subs, sizeof(struct file_sub *) * (fd->file_sub_count + 1)); } fd->file_subs[fd->file_sub_count] = (struct file_sub *)malloc(sizeof(struct file_sub)); fd->file_subs[fd->file_sub_count]->name = strdup(section); if (strcasecmp(name, "upload sec level") == 0) { fd->file_subs[fd->file_sub_count]->upload_sec_level = atoi(value); } else if (strcasecmp(name, "download sec level") == 0) { fd->file_subs[fd->file_sub_count]->download_sec_level = atoi(value); } else if (strcasecmp(name, "database") == 0) { fd->file_subs[fd->file_sub_count]->database = strdup(value); } else if (strcasecmp(name, "upload path") == 0) { fd->file_subs[fd->file_sub_count]->upload_path = strdup(value); } fd->file_sub_count++; } return 1; } static int mail_area_handler(void* user, const char* section, const char* name, const char* value) { struct mail_conference *mc = (struct mail_conference *)user; int i; if (strcasecmp(section, "main") == 0) { if (strcasecmp(name, "visible sec level") == 0) { mc->sec_level = atoi(value); } else if (strcasecmp(name, "networked") == 0) { if (strcasecmp(value, "true") == 0) { mc->networked = 1; } else { mc->networked = 0; } } else if (strcasecmp(name, "real names") == 0) { if (strcasecmp(value, "true") == 0) { mc->realnames = 1; } else { mc->realnames = 0; } } else if (strcasecmp(name, "tagline") == 0) { mc->tagline = strdup(value); } } else if (strcasecmp(section, "network") == 0) { if (strcasecmp(name, "type") == 0) { if (strcasecmp(value, "fido") == 0) { mc->nettype = NETWORK_FIDO; } else if (strcasecmp(value, "wwiv") == 0) { mc->nettype = NETWORK_WWIV; } } else if (strcasecmp(name, "fido node") == 0) { mc->fidoaddr = parse_fido_addr(value); } else if (strcasecmp(name, "wwiv node") == 0) { mc->wwivnode = atoi(value); } } else { // check if it's partially filled in for (i=0;imail_area_count;i++) { if (strcasecmp(mc->mail_areas[i]->name, section) == 0) { if (strcasecmp(name, "read sec level") == 0) { mc->mail_areas[i]->read_sec_level = atoi(value); } else if (strcasecmp(name, "write sec level") == 0) { mc->mail_areas[i]->write_sec_level = atoi(value); } else if (strcasecmp(name, "path") == 0) { mc->mail_areas[i]->path = strdup(value); } else if (strcasecmp(name, "type") == 0) { if (strcasecmp(value, "local") == 0) { mc->mail_areas[i]->type = TYPE_LOCAL_AREA; } else if (strcasecmp(value, "echo") == 0) { mc->mail_areas[i]->type = TYPE_ECHOMAIL_AREA; } else if (strcasecmp(value, "netmail") == 0) { mc->mail_areas[i]->type = TYPE_NETMAIL_AREA; } } return 1; } } if (mc->mail_area_count == 0) { mc->mail_areas = (struct mail_area **)malloc(sizeof(struct mail_area *)); } else { mc->mail_areas = (struct mail_area **)realloc(mc->mail_areas, sizeof(struct mail_area *) * (mc->mail_area_count + 1)); } mc->mail_areas[mc->mail_area_count] = (struct mail_area *)malloc(sizeof(struct mail_area)); mc->mail_areas[mc->mail_area_count]->name = strdup(section); if (strcasecmp(name, "read sec level") == 0) { mc->mail_areas[mc->mail_area_count]->read_sec_level = atoi(value); } else if (strcasecmp(name, "write sec level") == 0) { mc->mail_areas[mc->mail_area_count]->write_sec_level = atoi(value); } else if (strcasecmp(name, "path") == 0) { mc->mail_areas[mc->mail_area_count]->path = strdup(value); } else if (strcasecmp(name, "type") == 0) { if (strcasecmp(value, "local") == 0) { mc->mail_areas[mc->mail_area_count]->type = TYPE_LOCAL_AREA; } else if (strcasecmp(value, "echo") == 0) { mc->mail_areas[mc->mail_area_count]->type = TYPE_ECHOMAIL_AREA; } else if (strcasecmp(value, "netmail") == 0) { mc->mail_areas[mc->mail_area_count]->type = TYPE_NETMAIL_AREA; } } mc->mail_area_count++; } return 1; } static int handler(void* user, const char* section, const char* name, const char* value) { struct bbs_config *conf = (struct bbs_config *)user; if (strcasecmp(section, "main") == 0) { if (strcasecmp(name, "bbs name") == 0) { conf->bbs_name = strdup(value); } else if (strcasecmp(name, "telnet port") == 0) { conf->telnet_port = atoi(value); } else if (strcasecmp(name, "enable ssh") == 0) { if (strcasecmp(value, "true") == 0) { conf->ssh_server = 1; } else { conf->ssh_server = 0; } } else if (strcasecmp(name, "ssh port") == 0) { conf->ssh_port = atoi(value); } else if (strcasecmp(name, "ssh dsa key") == 0) { conf->ssh_dsa_key = strdup(value); } else if (strcasecmp(name, "ssh rsa key") == 0) { conf->ssh_rsa_key = strdup(value); } else if (strcasecmp(name, "sysop name") == 0) { conf->sysop_name = strdup(value); } else if (strcasecmp(name, "nodes") == 0) { conf->nodes = atoi(value); } else if (strcasecmp(name, "new user level") == 0) { conf->newuserlvl = atoi(value); } else if (strcasecmp(name, "irc server") == 0) { conf->irc_server = strdup(value); } else if (strcasecmp(name, "irc port") == 0) { conf->irc_port = atoi(value); } else if (strcasecmp(name, "irc channel") == 0) { conf->irc_channel = strdup(value); } else if (strcasecmp(name, "default tagline") == 0) { conf->default_tagline = strdup(value); } else if (strcasecmp(name, "external editor cmd") == 0) { conf->external_editor_cmd = strdup(value); } else if (strcasecmp(name, "external editor stdio") == 0) { if (strcasecmp(value, "true") == 0) { conf->external_editor_stdio = 1; } else { conf->external_editor_stdio = 0; } } else if (strcasecmp(name, "automessage write level") == 0) { conf->automsgwritelvl = atoi(value); } else if (strcasecmp(name, "fork") == 0) { if (strcasecmp(value, "true") == 0) { conf->fork = 1; } else { conf->fork = 0; } } } else if (strcasecmp(section, "paths") == 0){ if (strcasecmp(name, "ansi path") == 0) { conf->ansi_path = strdup(value); } else if (strcasecmp(name, "bbs path") == 0) { conf->bbs_path = strdup(value); } else if (strcasecmp(name, "log path") == 0) { conf->log_path = strdup(value); } else if (strcasecmp(name, "script path") == 0) { conf->script_path = strdup(value); } else if (strcasecmp(name, "echomail semaphore") == 0) { conf->echomail_sem = strdup(value); } else if (strcasecmp(name, "netmail semaphore") == 0) { conf->netmail_sem = strdup(value); } else if (strcasecmp(name, "pid file") == 0) { conf->pid_file = strdup(value); } } else if (strcasecmp(section, "mail conferences") == 0) { if (conf->mail_conference_count == 0) { conf->mail_conferences = (struct mail_conference **)malloc(sizeof(struct mail_conference *)); } else { conf->mail_conferences = (struct mail_conference **)realloc(conf->mail_conferences, sizeof(struct mail_conference *) * (conf->mail_conference_count + 1)); } conf->mail_conferences[conf->mail_conference_count] = (struct mail_conference *)malloc(sizeof(struct mail_conference)); conf->mail_conferences[conf->mail_conference_count]->name = strdup(name); conf->mail_conferences[conf->mail_conference_count]->path = strdup(value); conf->mail_conferences[conf->mail_conference_count]->tagline = NULL; conf->mail_conferences[conf->mail_conference_count]->mail_area_count = 0; conf->mail_conferences[conf->mail_conference_count]->nettype = 0; conf->mail_conference_count++; } else if (strcasecmp(section, "file directories") == 0) { if (conf->file_directory_count == 0) { conf->file_directories = (struct file_directory **)malloc(sizeof(struct file_directory *)); } else { conf->file_directories = (struct file_directory **)realloc(conf->file_directories, sizeof(struct file_directory *) * (conf->file_directory_count + 1)); } conf->file_directories[conf->file_directory_count] = (struct file_directory *)malloc(sizeof(struct file_directory)); conf->file_directories[conf->file_directory_count]->name = strdup(name); conf->file_directories[conf->file_directory_count]->path = strdup(value); conf->file_directories[conf->file_directory_count]->file_sub_count = 0; conf->file_directory_count++; } else if (strcasecmp(section, "text files") == 0) { if (conf->text_file_count == 0) { conf->text_files = (struct text_file **)malloc(sizeof(struct text_file *)); } else { conf->text_files = (struct text_file **)realloc(conf->text_files, sizeof(struct text_file *) * (conf->text_file_count + 1)); } conf->text_files[conf->text_file_count] = (struct text_file *)malloc(sizeof(struct text_file)); conf->text_files[conf->text_file_count]->name = strdup(name); conf->text_files[conf->text_file_count]->path = strdup(value); conf->text_file_count++; } return 1; } int ssh_authenticate(ssh_session p_ssh_session) { ssh_message message; char *username; char *password; do { message = ssh_message_get(p_ssh_session); switch(ssh_message_type(message)) { case SSH_REQUEST_AUTH: switch(ssh_message_subtype(message)) { case SSH_AUTH_METHOD_PASSWORD: username = ssh_message_auth_user(message); password = ssh_message_auth_password(message); if (strcasecmp(username, "new") == 0 && strcasecmp(password, "new") == 0) { ssh_message_auth_reply_success(message, 0); ssh_message_free(message); gUser = NULL; return 1; } gUser = check_user_pass(username, password); if (gUser != NULL) { ssh_message_auth_reply_success(message, 0); ssh_message_free(message); return 1; } ssh_message_free(message); return 0; case SSH_AUTH_METHOD_NONE: default: ssh_message_auth_set_methods(message, SSH_AUTH_METHOD_PASSWORD | SSH_AUTH_METHOD_INTERACTIVE); ssh_message_reply_default(message); break; } break; default: ssh_message_auth_set_methods(message, SSH_AUTH_METHOD_PASSWORD | SSH_AUTH_METHOD_INTERACTIVE); ssh_message_reply_default(message); break; } ssh_message_free(message); } while(1); } char *ssh_getip(ssh_session session) { struct sockaddr_storage tmp; struct sockaddr_in *sock; unsigned int len = 100; char ip[100] = "\0"; getpeername(ssh_get_fd(session), (struct sockaddr*)&tmp, &len); sock = (struct sockaddr_in *)&tmp; inet_ntop(AF_INET, &sock->sin_addr, ip, len); return strdup(ip); } static int ssh_copy_fd_to_chan(socket_t fd, int revents, void *userdata) { ssh_channel chan = (ssh_channel)userdata; char buf[2048]; int sz = 0; if(!chan) { close(fd); return -1; } if(revents & POLLIN) { sz = read(fd, buf, 2048); if(sz > 0) { ssh_channel_write(chan, buf, sz); } } if(revents & POLLHUP) { ssh_channel_close(chan); sz = -1; } return sz; } static int ssh_copy_chan_to_fd(ssh_session session, ssh_channel channel, void *data, uint32_t len, int is_stderr, void *userdata) { int fd = *(int*)userdata; int sz; (void)session; (void)channel; (void)is_stderr; sz = write(fd, data, len); return sz; } static void ssh_chan_close(ssh_session session, ssh_channel channel, void *userdata) { int fd = *(int*)userdata; int status; (void)session; (void)channel; kill(bbs_pid, SIGTERM); waitpid(bbs_pid, &status, 0); close(fd); } struct ssh_channel_callbacks_struct ssh_cb = { .channel_data_function = ssh_copy_chan_to_fd, .channel_eof_function = ssh_chan_close, .channel_close_function = ssh_chan_close, .userdata = NULL }; void serverssh(int port) { ssh_session p_ssh_session; ssh_bind p_ssh_bind; int err; int pid; int shell = 0; int fd; ssh_channel chan = 0; char *ip; ssh_event event; short events; ssh_message message; struct termios tios; err = ssh_init(); if (err == -1) { fprintf(stderr, "Error starting SSH server.\n"); exit(-1); } p_ssh_session = ssh_new(); if (p_ssh_session == NULL) { fprintf(stderr, "Error starting SSH server.\n"); exit(-1); } p_ssh_bind = ssh_bind_new(); if (p_ssh_bind == NULL) { fprintf(stderr, "Error starting SSH server.\n"); exit(-1); } ssh_bind_options_set(p_ssh_bind, SSH_BIND_OPTIONS_BINDPORT, &port); ssh_bind_options_set(p_ssh_bind, SSH_BIND_OPTIONS_DSAKEY, conf.ssh_dsa_key); ssh_bind_options_set(p_ssh_bind, SSH_BIND_OPTIONS_RSAKEY, conf.ssh_rsa_key); ssh_bind_listen(p_ssh_bind); while (1) { if (ssh_bind_accept(p_ssh_bind, p_ssh_session) == SSH_OK) { pid = fork(); if (pid == 0) { if (ssh_handle_key_exchange(p_ssh_session)) { exit(-1); } if (ssh_authenticate(p_ssh_session) == 1) { do { message = ssh_message_get(p_ssh_session); if (message) { if (ssh_message_type(message) == SSH_REQUEST_CHANNEL_OPEN && ssh_message_subtype(message) == SSH_CHANNEL_SESSION) { chan = ssh_message_channel_request_open_reply_accept(message); ssh_message_free(message); break; } else { ssh_message_reply_default(message); ssh_message_free(message); } } else { break; } } while(!chan); if (!chan) { fprintf(stderr, "Failed to get channel\n"); ssh_finalize(); exit(-1); } do { message = ssh_message_get(p_ssh_session); if (message) { if (ssh_message_type(message) == SSH_REQUEST_CHANNEL) { if (ssh_message_subtype(message) == SSH_CHANNEL_REQUEST_SHELL) { shell = 1; ssh_message_channel_request_reply_success(message); ssh_message_free(message); break; } else if (ssh_message_subtype(message) == SSH_CHANNEL_REQUEST_PTY) { ssh_message_channel_request_reply_success(message); ssh_message_free(message); continue; } } } else { break; } } while (!shell); if (!shell) { fprintf(stderr, "Failed to get shell\n"); ssh_finalize(); exit(-1); } ip = ssh_getip(p_ssh_session); bbs_pid = forkpty(&fd, NULL, NULL, NULL); if (bbs_pid == 0) { tcgetattr(STDIN_FILENO, &tios); tios.c_lflag &= ~(ICANON | ECHO | ECHONL); tios.c_iflag &= INLCR; tcsetattr(STDIN_FILENO, TCSAFLUSH, &tios); runbbs_ssh(ip); exit(0); } free(ip); ssh_cb.userdata = &fd; ssh_callbacks_init(&ssh_cb); ssh_set_channel_callbacks(chan, &ssh_cb); events = POLLIN | POLLPRI | POLLERR | POLLHUP | POLLNVAL; event = ssh_event_new(); if(event == NULL) { ssh_finalize(); exit(0); } if(ssh_event_add_fd(event, fd, events, ssh_copy_fd_to_chan, chan) != SSH_OK) { ssh_finalize(); exit(0); } if(ssh_event_add_session(event, p_ssh_session) != SSH_OK) { ssh_finalize(); exit(0); } do { ssh_event_dopoll(event, 1000); } while(!ssh_channel_is_closed(chan)); ssh_event_remove_fd(event, fd); ssh_event_remove_session(event, p_ssh_session); ssh_event_free(event); } ssh_disconnect(p_ssh_session); ssh_finalize(); exit(0); } else if (pid > 0) { } else { } } } } void server(int port) { struct sigaction sa; struct sigaction st; int socket_desc, client_sock, c; int pid; struct sockaddr_in server, client; sa.sa_handler = sigchld_handler; // reap all dead processes sigemptyset(&sa.sa_mask); sa.sa_flags = SA_RESTART; if (sigaction(SIGCHLD, &sa, NULL) == -1) { remove(conf.pid_file); perror("sigaction"); exit(1); } st.sa_handler = sigterm_handler; sigemptyset(&st.sa_mask); if (sigaction(SIGTERM, &st, NULL) == -1) { remove(conf.pid_file); perror("sigaction"); exit(1); } if (conf.ssh_server) { // fork ssh server ssh_pid = fork(); if (ssh_pid > 0) { serverssh(conf.ssh_port); exit(0); } if (ssh_pid != 0) { fprintf(stderr, "Error forking ssh server."); } } socket_desc = socket(AF_INET, SOCK_STREAM, 0); if (socket_desc == -1) { remove(conf.pid_file); fprintf(stderr, "Couldn't create socket..\n"); exit(1); } server.sin_family = AF_INET; server.sin_addr.s_addr = INADDR_ANY; server.sin_port = htons(port); if (bind(socket_desc, (struct sockaddr *)&server, sizeof(server)) < 0) { perror("Bind Failed, Error\n"); exit(1); } listen(socket_desc, 3); c = sizeof(struct sockaddr_in); while ((client_sock = accept(socket_desc, (struct sockaddr *)&client, (socklen_t *)&c))) { if (client_sock == -1) { if (errno == EINTR) { continue; } else { exit(-1); } } pid = fork(); if (pid < 0) { perror("Error on fork\n"); exit(1); } if (pid == 0) { close(socket_desc); runbbs(client_sock, strdup(inet_ntoa(client.sin_addr))); exit(0); } else { close(client_sock); } } } int main(int argc, char **argv) { int i; int main_pid; FILE *fptr; struct stat s; if (argc < 2) { fprintf(stderr, "Usage ./magicka config/bbs.ini\n"); exit(1); } conf.mail_conference_count = 0; conf.door_count = 0; conf.file_directory_count = 0; conf.irc_server = NULL; conf.irc_port = 6667; conf.text_file_count = 0; conf.external_editor_cmd = NULL; conf.log_path = NULL; conf.script_path = NULL; conf.automsgwritelvl = 10; conf.echomail_sem = NULL; conf.netmail_sem = NULL; conf.telnet_port = 0; // Load BBS data if (ini_parse(argv[1], handler, &conf) <0) { fprintf(stderr, "Unable to load configuration ini (%s)!\n", argv[1]); exit(-1); } // Load mail Areas for (i=0;ipath, mail_area_handler, conf.mail_conferences[i]) <0) { fprintf(stderr, "Unable to load configuration ini (%s)!\n", conf.mail_conferences[i]->path); exit(-1); } } // Load file Subs for (i=0;ipath, file_sub_handler, conf.file_directories[i]) <0) { fprintf(stderr, "Unable to load configuration ini (%s)!\n", conf.file_directories[i]->path); exit(-1); } } if (ini_parse("config/doors.ini", door_config_handler, &conf) <0) { fprintf(stderr, "Unable to load configuration ini (doors.ini)!\n"); exit(-1); } if (conf.fork) { if (stat(conf.pid_file, &s) == 0) { fprintf(stderr, "Magicka already running or stale pid file at: %s\n", conf.pid_file); exit(-1); } main_pid = fork(); if (main_pid < 0) { fprintf(stderr, "Error forking.\n"); exit(-1); } else if (main_pid > 0) { fptr = fopen(conf.pid_file, "w"); if (!fptr) { fprintf(stderr, "Unable to open pid file for writing.\n"); } else { fprintf(fptr, "%d", main_pid); fclose(fptr); } } else { server(conf.telnet_port); } } else { server(conf.telnet_port); } }