/* Unix SMB/CIFS implementation. Winbind child daemons Copyright (C) Andrew Tridgell 2002 Copyright (C) Volker Lendecke 2004,2005 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ /* * We fork a child per domain to be able to act non-blocking in the main * winbind daemon. A domain controller thousands of miles away being being * slow replying with a 10.000 user list should not hold up netlogon calls * that can be handled locally. */ #include "includes.h" #include "winbindd.h" #undef DBGC_CLASS #define DBGC_CLASS DBGC_WINBIND extern bool override_logfile; extern struct winbindd_methods cache_methods; /* Read some data from a client connection */ static void child_read_request(struct winbindd_cli_state *state) { NTSTATUS status; /* Read data */ status = read_data(state->sock, (char *)&state->request, sizeof(state->request)); if (!NT_STATUS_IS_OK(status)) { DEBUG(3, ("child_read_request: read_data failed: %s\n", nt_errstr(status))); state->finished = True; return; } if (state->request.extra_len == 0) { state->request.extra_data.data = NULL; return; } DEBUG(10, ("Need to read %d extra bytes\n", (int)state->request.extra_len)); state->request.extra_data.data = SMB_MALLOC_ARRAY(char, state->request.extra_len + 1); if (state->request.extra_data.data == NULL) { DEBUG(0, ("malloc failed\n")); state->finished = True; return; } /* Ensure null termination */ state->request.extra_data.data[state->request.extra_len] = '\0'; status= read_data(state->sock, state->request.extra_data.data, state->request.extra_len); if (!NT_STATUS_IS_OK(status)) { DEBUG(0, ("Could not read extra data: %s\n", nt_errstr(status))); state->finished = True; return; } } /* * Machinery for async requests sent to children. You set up a * winbindd_request, select a child to query, and issue a async_request * call. When the request is completed, the callback function you specified is * called back with the private pointer you gave to async_request. */ struct winbindd_async_request { struct winbindd_async_request *next, *prev; TALLOC_CTX *mem_ctx; struct winbindd_child *child; struct winbindd_request *request; struct winbindd_response *response; void (*continuation)(void *private_data, bool success); struct timed_event *reply_timeout_event; pid_t child_pid; /* pid of the child we're waiting on. Used to detect a restart of the child (child->pid != child_pid). */ void *private_data; }; static void async_request_fail(struct winbindd_async_request *state); static void async_main_request_sent(void *private_data, bool success); static void async_request_sent(void *private_data, bool success); static void async_reply_recv(void *private_data, bool success); static void schedule_async_request(struct winbindd_child *child); void async_request(TALLOC_CTX *mem_ctx, struct winbindd_child *child, struct winbindd_request *request, struct winbindd_response *response, void (*continuation)(void *private_data, bool success), void *private_data) { struct winbindd_async_request *state; SMB_ASSERT(continuation != NULL); DEBUG(10, ("Sending request to child pid %d (domain=%s)\n", (int)child->pid, (child->domain != NULL) ? child->domain->name : "''")); state = TALLOC_P(mem_ctx, struct winbindd_async_request); if (state == NULL) { DEBUG(0, ("talloc failed\n")); continuation(private_data, False); return; } state->mem_ctx = mem_ctx; state->child = child; state->reply_timeout_event = NULL; state->request = request; state->response = response; state->continuation = continuation; state->private_data = private_data; DLIST_ADD_END(child->requests, state, struct winbindd_async_request *); schedule_async_request(child); return; } static void async_main_request_sent(void *private_data, bool success) { struct winbindd_async_request *state = talloc_get_type_abort(private_data, struct winbindd_async_request); if (!success) { DEBUG(5, ("Could not send async request\n")); async_request_fail(state); return; } if (state->request->extra_len == 0) { async_request_sent(private_data, True); return; } setup_async_write(&state->child->event, state->request->extra_data.data, state->request->extra_len, async_request_sent, state); } /**************************************************************** Handler triggered if the child winbindd doesn't respond within a given timeout. ****************************************************************/ static void async_request_timeout_handler(struct event_context *ctx, struct timed_event *te, struct timeval now, void *private_data) { struct winbindd_async_request *state = talloc_get_type_abort(private_data, struct winbindd_async_request); DEBUG(0,("async_request_timeout_handler: child pid %u is not responding. " "Closing connection to it.\n", (unsigned int)state->child_pid )); /* Deal with the reply - set to error. */ async_reply_recv(private_data, False); } /************************************************************** Common function called on both async send and recv fail. Cleans up the child and schedules the next request. **************************************************************/ static void async_request_fail(struct winbindd_async_request *state) { DLIST_REMOVE(state->child->requests, state); TALLOC_FREE(state->reply_timeout_event); /* If child exists and is not already reaped, send kill signal to child. */ if ((state->child->pid != (pid_t)0) && (state->child->pid != (pid_t)-1) && (state->child->pid == state->child_pid)) { kill(state->child_pid, SIGTERM); /* * Close the socket to the child. */ winbind_child_died(state->child_pid); } state->response->length = sizeof(struct winbindd_response); state->response->result = WINBINDD_ERROR; state->continuation(state->private_data, False); } static void async_request_sent(void *private_data_data, bool success) { struct winbindd_async_request *state = talloc_get_type_abort(private_data_data, struct winbindd_async_request); if (!success) { DEBUG(5, ("Could not send async request to child pid %u\n", (unsigned int)state->child_pid )); async_request_fail(state); return; } /* Request successfully sent to the child, setup the wait for reply */ setup_async_read(&state->child->event, &state->response->result, sizeof(state->response->result), async_reply_recv, state); /* * Set up a timeout of 300 seconds for the response. * If we don't get it close the child socket and * report failure. */ state->reply_timeout_event = event_add_timed(winbind_event_context(), NULL, timeval_current_ofs(300,0), async_request_timeout_handler, state); if (!state->reply_timeout_event) { smb_panic("async_request_sent: failed to add timeout handler.\n"); } } static void async_reply_recv(void *private_data, bool success) { struct winbindd_async_request *state = talloc_get_type_abort(private_data, struct winbindd_async_request); struct winbindd_child *child = state->child; TALLOC_FREE(state->reply_timeout_event); state->response->length = sizeof(struct winbindd_response); if (!success) { DEBUG(5, ("Could not receive async reply from child pid %u\n", (unsigned int)state->child_pid )); cache_cleanup_response(state->child_pid); async_request_fail(state); return; } SMB_ASSERT(cache_retrieve_response(state->child_pid, state->response)); cache_cleanup_response(state->child_pid); DLIST_REMOVE(child->requests, state); schedule_async_request(child); state->continuation(state->private_data, True); } static bool fork_domain_child(struct winbindd_child *child); static void schedule_async_request(struct winbindd_child *child) { struct winbindd_async_request *request = child->requests; if (request == NULL) { return; } if (child->event.flags != 0) { return; /* Busy */ } /* * This may be a reschedule, so we might * have an existing timeout event pending on * the first entry in the child->requests list * (we only send one request at a time). * Ensure we free it before we reschedule. * Bug #5814, from hargagan <shargagan@novell.com>. * JRA. */ TALLOC_FREE(request->reply_timeout_event); if ((child->pid == 0) && (!fork_domain_child(child))) { /* fork_domain_child failed. Cancel all outstanding requests */ while (request != NULL) { /* request might be free'd in the continuation */ struct winbindd_async_request *next = request->next; async_request_fail(request); request = next; } return; } /* Now we know who we're sending to - remember the pid. */ request->child_pid = child->pid; setup_async_write(&child->event, request->request, sizeof(*request->request), async_main_request_sent, request); return; } struct domain_request_state { TALLOC_CTX *mem_ctx; struct winbindd_domain *domain; struct winbindd_request *request; struct winbindd_response *response; void (*continuation)(void *private_data_data, bool success); void *private_data_data; }; static void domain_init_recv(void *private_data_data, bool success); void async_domain_request(TALLOC_CTX *mem_ctx, struct winbindd_domain *domain, struct winbindd_request *request, struct winbindd_response *response, void (*continuation)(void *private_data_data, bool success), void *private_data_data) { struct domain_request_state *state; if (domain->initialized) { async_request(mem_ctx, &domain->child, request, response, continuation, private_data_data); return; } state = TALLOC_P(mem_ctx, struct domain_request_state); if (state == NULL) { DEBUG(0, ("talloc failed\n")); continuation(private_data_data, False); return; } state->mem_ctx = mem_ctx; state->domain = domain; state->request = request; state->response = response; state->continuation = continuation; state->private_data_data = private_data_data; init_child_connection(domain, domain_init_recv, state); } static void domain_init_recv(void *private_data_data, bool success) { struct domain_request_state *state = talloc_get_type_abort(private_data_data, struct domain_request_state); if (!success) { DEBUG(5, ("Domain init returned an error\n")); state->continuation(state->private_data_data, False); return; } async_request(state->mem_ctx, &state->domain->child, state->request, state->response, state->continuation, state->private_data_data); } static void recvfrom_child(void *private_data_data, bool success) { struct winbindd_cli_state *state = talloc_get_type_abort(private_data_data, struct winbindd_cli_state); enum winbindd_result result = state->response.result; /* This is an optimization: The child has written directly to the * response buffer. The request itself is still in pending state, * state that in the result code. */ state->response.result = WINBINDD_PENDING; if ((!success) || (result != WINBINDD_OK)) { request_error(state); return; } request_ok(state); } void sendto_child(struct winbindd_cli_state *state, struct winbindd_child *child) { async_request(state->mem_ctx, child, &state->request, &state->response, recvfrom_child, state); } void sendto_domain(struct winbindd_cli_state *state, struct winbindd_domain *domain) { async_domain_request(state->mem_ctx, domain, &state->request, &state->response, recvfrom_child, state); } static void child_process_request(struct winbindd_child *child, struct winbindd_cli_state *state) { struct winbindd_domain *domain = child->domain; const struct winbindd_child_dispatch_table *table = child->table; /* Free response data - we may be interrupted and receive another command before being able to send this data off. */ state->response.result = WINBINDD_ERROR; state->response.length = sizeof(struct winbindd_response); /* as all requests in the child are sync, we can use talloc_tos() */ state->mem_ctx = talloc_tos(); /* Process command */ for (; table->name; table++) { if (state->request.cmd == table->struct_cmd) { DEBUG(10,("child_process_request: request fn %s\n", table->name)); state->response.result = table->struct_fn(domain, state); return; } } DEBUG(1 ,("child_process_request: unknown request fn number %d\n", (int)state->request.cmd)); state->response.result = WINBINDD_ERROR; } void setup_child(struct winbindd_child *child, const struct winbindd_child_dispatch_table *table, const char *logprefix, const char *logname) { if (logprefix && logname) { if (asprintf(&child->logfilename, "%s/%s-%s", get_dyn_LOGFILEBASE(), logprefix, logname) < 0) { smb_panic("Internal error: asprintf failed"); } } else { smb_panic("Internal error: logprefix == NULL && " "logname == NULL"); } child->domain = NULL; child->table = table; } struct winbindd_child *children = NULL; void winbind_child_died(pid_t pid) { struct winbindd_child *child; for (child = children; child != NULL; child = child->next) { if (child->pid == pid) { break; } } if (child == NULL) { DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid)); return; } /* This will be re-added in fork_domain_child() */ DLIST_REMOVE(children, child); remove_fd_event(&child->event); close(child->event.fd); child->event.fd = 0; child->event.flags = 0; child->pid = 0; if (child->requests) { /* * schedule_async_request() will also * clear this event but the call is * idempotent so it doesn't hurt to * cover all possible future code * paths. JRA. */ TALLOC_FREE(child->requests->reply_timeout_event); } schedule_async_request(child); } /* Ensure any negative cache entries with the netbios or realm names are removed. */ void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain) { flush_negative_conn_cache_for_domain(domain->name); if (*domain->alt_name) { flush_negative_conn_cache_for_domain(domain->alt_name); } } /* * Parent winbindd process sets its own debug level first and then * sends a message to all the winbindd children to adjust their debug * level to that of parents. */ void winbind_msg_debug(struct messaging_context *msg_ctx, void *private_data, uint32_t msg_type, struct server_id server_id, DATA_BLOB *data) { struct winbindd_child *child; DEBUG(10,("winbind_msg_debug: got debug message.\n")); debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data); for (child = children; child != NULL; child = child->next) { DEBUG(10,("winbind_msg_debug: sending message to pid %u.\n", (unsigned int)child->pid)); messaging_send_buf(msg_ctx, pid_to_procid(child->pid), MSG_DEBUG, data->data, strlen((char *) data->data) + 1); } } /* Set our domains as offline and forward the offline message to our children. */ void winbind_msg_offline(struct messaging_context *msg_ctx, void *private_data, uint32_t msg_type, struct server_id server_id, DATA_BLOB *data) { struct winbindd_child *child; struct winbindd_domain *domain; DEBUG(10,("winbind_msg_offline: got offline message.\n")); if (!lp_winbind_offline_logon()) { DEBUG(10,("winbind_msg_offline: rejecting offline message.\n")); return; } /* Set our global state as offline. */ if (!set_global_winbindd_state_offline()) { DEBUG(10,("winbind_msg_offline: offline request failed.\n")); return; } /* Set all our domains as offline. */ for (domain = domain_list(); domain; domain = domain->next) { if (domain->internal) { continue; } DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name)); set_domain_offline(domain); } for (child = children; child != NULL; child = child->next) { /* Don't send message to internal childs. We've already done so above. */ if (!child->domain || winbindd_internal_child(child)) { continue; } /* Or internal domains (this should not be possible....) */ if (child->domain->internal) { continue; } /* Each winbindd child should only process requests for one domain - make sure we only set it online / offline for that domain. */ DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n", (unsigned int)child->pid, domain->name )); messaging_send_buf(msg_ctx, pid_to_procid(child->pid), MSG_WINBIND_OFFLINE, (uint8 *)child->domain->name, strlen(child->domain->name)+1); } } /* Set our domains as online and forward the online message to our children. */ void winbind_msg_online(struct messaging_context *msg_ctx, void *private_data, uint32_t msg_type, struct server_id server_id, DATA_BLOB *data) { struct winbindd_child *child; struct winbindd_domain *domain; DEBUG(10,("winbind_msg_online: got online message.\n")); if (!lp_winbind_offline_logon()) { DEBUG(10,("winbind_msg_online: rejecting online message.\n")); return; } /* Set our global state as online. */ set_global_winbindd_state_online(); smb_nscd_flush_user_cache(); smb_nscd_flush_group_cache(); /* Set all our domains as online. */ for (domain = domain_list(); domain; domain = domain->next) { if (domain->internal) { continue; } DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name)); winbindd_flush_negative_conn_cache(domain); set_domain_online_request(domain); /* Send an online message to the idmap child when our primary domain comes back online */ if ( domain->primary ) { struct winbindd_child *idmap = idmap_child(); if ( idmap->pid != 0 ) { messaging_send_buf(msg_ctx, pid_to_procid(idmap->pid), MSG_WINBIND_ONLINE, (uint8 *)domain->name, strlen(domain->name)+1); } } } for (child = children; child != NULL; child = child->next) { /* Don't send message to internal childs. */ if (!child->domain || winbindd_internal_child(child)) { continue; } /* Or internal domains (this should not be possible....) */ if (child->domain->internal) { continue; } /* Each winbindd child should only process requests for one domain - make sure we only set it online / offline for that domain. */ DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n", (unsigned int)child->pid, child->domain->name )); messaging_send_buf(msg_ctx, pid_to_procid(child->pid), MSG_WINBIND_ONLINE, (uint8 *)child->domain->name, strlen(child->domain->name)+1); } } static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx) { struct winbindd_domain *domain; char *buf = NULL; if ((buf = talloc_asprintf(mem_ctx, "global:%s ", get_global_winbindd_state_offline() ? "Offline":"Online")) == NULL) { return NULL; } for (domain = domain_list(); domain; domain = domain->next) { if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ", domain->name, domain->online ? "Online":"Offline")) == NULL) { return NULL; } } buf = talloc_asprintf_append_buffer(buf, "\n"); DEBUG(5,("collect_onlinestatus: %s", buf)); return buf; } void winbind_msg_onlinestatus(struct messaging_context *msg_ctx, void *private_data, uint32_t msg_type, struct server_id server_id, DATA_BLOB *data) { TALLOC_CTX *mem_ctx; const char *message; struct server_id *sender; DEBUG(5,("winbind_msg_onlinestatus received.\n")); if (!data->data) { return; } sender = (struct server_id *)data->data; mem_ctx = talloc_init("winbind_msg_onlinestatus"); if (mem_ctx == NULL) { return; } message = collect_onlinestatus(mem_ctx); if (message == NULL) { talloc_destroy(mem_ctx); return; } messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS, (uint8 *)message, strlen(message) + 1); talloc_destroy(mem_ctx); } void winbind_msg_dump_event_list(struct messaging_context *msg_ctx, void *private_data, uint32_t msg_type, struct server_id server_id, DATA_BLOB *data) { struct winbindd_child *child; DEBUG(10,("winbind_msg_dump_event_list received\n")); dump_event_list(winbind_event_context()); for (child = children; child != NULL; child = child->next) { DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n", (unsigned int)child->pid)); messaging_send_buf(msg_ctx, pid_to_procid(child->pid), MSG_DUMP_EVENT_LIST, NULL, 0); } } void winbind_msg_dump_domain_list(struct messaging_context *msg_ctx, void *private_data, uint32_t msg_type, struct server_id server_id, DATA_BLOB *data) { TALLOC_CTX *mem_ctx; const char *message = NULL; struct server_id *sender = NULL; const char *domain = NULL; char *s = NULL; NTSTATUS status; struct winbindd_domain *dom = NULL; DEBUG(5,("winbind_msg_dump_domain_list received.\n")); if (!data || !data->data) { return; } if (data->length < sizeof(struct server_id)) { return; } mem_ctx = talloc_init("winbind_msg_dump_domain_list"); if (!mem_ctx) { return; } sender = (struct server_id *)data->data; if (data->length > sizeof(struct server_id)) { domain = (const char *)data->data+sizeof(struct server_id); } if (domain) { DEBUG(5,("winbind_msg_dump_domain_list for domain: %s\n", domain)); message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain, find_domain_from_name_noinit(domain)); if (!message) { talloc_destroy(mem_ctx); return; } messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_DUMP_DOMAIN_LIST, (uint8_t *)message, strlen(message) + 1); talloc_destroy(mem_ctx); return; } DEBUG(5,("winbind_msg_dump_domain_list all domains\n")); for (dom = domain_list(); dom; dom=dom->next) { message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain, dom); if (!message) { talloc_destroy(mem_ctx); return; } s = talloc_asprintf_append(s, "%s\n", message); if (!s) { talloc_destroy(mem_ctx); return; } } status = messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_DUMP_DOMAIN_LIST, (uint8_t *)s, strlen(s) + 1); if (!NT_STATUS_IS_OK(status)) { DEBUG(0,("failed to send message: %s\n", nt_errstr(status))); } talloc_destroy(mem_ctx); } static void account_lockout_policy_handler(struct event_context *ctx, struct timed_event *te, struct timeval now, void *private_data) { struct winbindd_child *child = (struct winbindd_child *)private_data; TALLOC_CTX *mem_ctx = NULL; struct winbindd_methods *methods; struct samr_DomInfo12 lockout_policy; NTSTATUS result; DEBUG(10,("account_lockout_policy_handler called\n")); TALLOC_FREE(child->lockout_policy_event); if ( !winbindd_can_contact_domain( child->domain ) ) { DEBUG(10,("account_lockout_policy_handler: Removing myself since I " "do not have an incoming trust to domain %s\n", child->domain->name)); return; } methods = child->domain->methods; mem_ctx = talloc_init("account_lockout_policy_handler ctx"); if (!mem_ctx) { result = NT_STATUS_NO_MEMORY; } else { result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy); } TALLOC_FREE(mem_ctx); if (!NT_STATUS_IS_OK(result)) { DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n", nt_errstr(result))); } child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL, timeval_current_ofs(3600, 0), account_lockout_policy_handler, child); } static time_t get_machine_password_timeout(void) { /* until we have gpo support use lp setting */ return lp_machine_password_timeout(); } static bool calculate_next_machine_pwd_change(const char *domain, struct timeval *t) { time_t pass_last_set_time; time_t timeout; time_t next_change; char *pw; pw = secrets_fetch_machine_password(domain, &pass_last_set_time, NULL); if (pw == NULL) { DEBUG(0,("cannot fetch own machine password ????")); return false; } SAFE_FREE(pw); timeout = get_machine_password_timeout(); if (timeout == 0) { DEBUG(10,("machine password never expires\n")); return false; } if (time(NULL) < (pass_last_set_time + timeout)) { next_change = pass_last_set_time + timeout; DEBUG(10,("machine password still valid until: %s\n", http_timestring(talloc_tos(), next_change))); *t = timeval_set(next_change, 0); return true; } DEBUG(10,("machine password expired, needs immediate change\n")); *t = timeval_zero(); return true; } static void machine_password_change_handler(struct event_context *ctx, struct timed_event *te, struct timeval now, void *private_data) { struct winbindd_child *child = (struct winbindd_child *)private_data; struct rpc_pipe_client *netlogon_pipe = NULL; TALLOC_CTX *frame; NTSTATUS result; struct timeval next_change; DEBUG(10,("machine_password_change_handler called\n")); TALLOC_FREE(child->machine_password_change_event); if (!calculate_next_machine_pwd_change(child->domain->name, &next_change)) { return; } if (!winbindd_can_contact_domain(child->domain)) { DEBUG(10,("machine_password_change_handler: Removing myself since I " "do not have an incoming trust to domain %s\n", child->domain->name)); return; } result = cm_connect_netlogon(child->domain, &netlogon_pipe); if (!NT_STATUS_IS_OK(result)) { DEBUG(10,("machine_password_change_handler: " "failed to connect netlogon pipe: %s\n", nt_errstr(result))); return; } frame = talloc_stackframe(); result = trust_pw_find_change_and_store_it(netlogon_pipe, frame, child->domain->name); TALLOC_FREE(frame); if (!NT_STATUS_IS_OK(result)) { DEBUG(10,("machine_password_change_handler: " "failed to change machine password: %s\n", nt_errstr(result))); } else { DEBUG(10,("machine_password_change_handler: " "successfully changed machine password\n")); } child->machine_password_change_event = event_add_timed(winbind_event_context(), NULL, next_change, machine_password_change_handler, child); } /* Deal with a request to go offline. */ static void child_msg_offline(struct messaging_context *msg, void *private_data, uint32_t msg_type, struct server_id server_id, DATA_BLOB *data) { struct winbindd_domain *domain; struct winbindd_domain *primary_domain = NULL; const char *domainname = (const char *)data->data; if (data->data == NULL || data->length == 0) { return; } DEBUG(5,("child_msg_offline received for domain %s.\n", domainname)); if (!lp_winbind_offline_logon()) { DEBUG(10,("child_msg_offline: rejecting offline message.\n")); return; } primary_domain = find_our_domain(); /* Mark the requested domain offline. */ for (domain = domain_list(); domain; domain = domain->next) { if (domain->internal) { continue; } if (strequal(domain->name, domainname)) { DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name)); set_domain_offline(domain); /* we are in the trusted domain, set the primary domain * offline too */ if (domain != primary_domain) { set_domain_offline(primary_domain); } } } } /* Deal with a request to go online. */ static void child_msg_online(struct messaging_context *msg, void *private_data, uint32_t msg_type, struct server_id server_id, DATA_BLOB *data) { struct winbindd_domain *domain; struct winbindd_domain *primary_domain = NULL; const char *domainname = (const char *)data->data; if (data->data == NULL || data->length == 0) { return; } DEBUG(5,("child_msg_online received for domain %s.\n", domainname)); if (!lp_winbind_offline_logon()) { DEBUG(10,("child_msg_online: rejecting online message.\n")); return; } primary_domain = find_our_domain(); /* Set our global state as online. */ set_global_winbindd_state_online(); /* Try and mark everything online - delete any negative cache entries to force a reconnect now. */ for (domain = domain_list(); domain; domain = domain->next) { if (domain->internal) { continue; } if (strequal(domain->name, domainname)) { DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name)); winbindd_flush_negative_conn_cache(domain); set_domain_online_request(domain); /* we can be in trusted domain, which will contact primary domain * we have to bring primary domain online in trusted domain process * see, winbindd_dual_pam_auth() --> winbindd_dual_pam_auth_samlogon() * --> contact_domain = find_our_domain() * */ if (domain != primary_domain) { winbindd_flush_negative_conn_cache(primary_domain); set_domain_online_request(primary_domain); } } } } static void child_msg_dump_event_list(struct messaging_context *msg, void *private_data, uint32_t msg_type, struct server_id server_id, DATA_BLOB *data) { DEBUG(5,("child_msg_dump_event_list received\n")); dump_event_list(winbind_event_context()); } bool winbindd_reinit_after_fork(const char *logfilename) { struct winbindd_domain *domain; struct winbindd_child *cl; if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(), winbind_event_context(), true))) { DEBUG(0,("reinit_after_fork() failed\n")); return false; } close_conns_after_fork(); if (!override_logfile && logfilename) { lp_set_logfile(logfilename); reopen_logs(); } if (!winbindd_setup_sig_term_handler(false)) return false; if (!winbindd_setup_sig_hup_handler(override_logfile ? NULL : logfilename)) return false; /* Don't handle the same messages as our parent. */ messaging_deregister(winbind_messaging_context(), MSG_SMB_CONF_UPDATED, NULL); messaging_deregister(winbind_messaging_context(), MSG_SHUTDOWN, NULL); messaging_deregister(winbind_messaging_context(), MSG_WINBIND_OFFLINE, NULL); messaging_deregister(winbind_messaging_context(), MSG_WINBIND_ONLINE, NULL); messaging_deregister(winbind_messaging_context(), MSG_WINBIND_ONLINESTATUS, NULL); messaging_deregister(winbind_messaging_context(), MSG_DUMP_EVENT_LIST, NULL); messaging_deregister(winbind_messaging_context(), MSG_WINBIND_DUMP_DOMAIN_LIST, NULL); messaging_deregister(winbind_messaging_context(), MSG_DEBUG, NULL); /* We have destroyed all events in the winbindd_event_context * in reinit_after_fork(), so clean out all possible pending * event pointers. */ /* Deal with check_online_events. */ for (domain = domain_list(); domain; domain = domain->next) { TALLOC_FREE(domain->check_online_event); } /* Ensure we're not handling a credential cache event inherited * from our parent. */ ccache_remove_all_after_fork(); /* Destroy all possible events in child list. */ for (cl = children; cl != NULL; cl = cl->next) { struct winbindd_async_request *request; for (request = cl->requests; request; request = request->next) { TALLOC_FREE(request->reply_timeout_event); } TALLOC_FREE(cl->lockout_policy_event); TALLOC_FREE(cl->machine_password_change_event); /* Children should never be able to send * each other messages, all messages must * go through the parent. */ cl->pid = (pid_t)0; } /* * This is a little tricky, children must not * send an MSG_WINBIND_ONLINE message to idmap_child(). * If we are in a child of our primary domain or * in the process created by fork_child_dc_connect(), * and the primary domain cannot go online, * fork_child_dc_connection() sends MSG_WINBIND_ONLINE * periodically to idmap_child(). * * The sequence is, fork_child_dc_connect() ---> getdcs() ---> * get_dc_name_via_netlogon() ---> cm_connect_netlogon() * ---> init_dc_connection() ---> cm_open_connection ---> * set_domain_online(), sends MSG_WINBIND_ONLINE to * idmap_child(). Disallow children sending messages * to each other, all messages must go through the parent. */ cl = idmap_child(); cl->pid = (pid_t)0; return true; } static bool fork_domain_child(struct winbindd_child *child) { int fdpair[2]; struct winbindd_cli_state state; struct winbindd_domain *primary_domain = NULL; if (child->domain) { DEBUG(10, ("fork_domain_child called for domain '%s'\n", child->domain->name)); } else { DEBUG(10, ("fork_domain_child called without domain.\n")); } if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) { DEBUG(0, ("Could not open child pipe: %s\n", strerror(errno))); return False; } ZERO_STRUCT(state); state.pid = sys_getpid(); child->pid = sys_fork(); if (child->pid == -1) { DEBUG(0, ("Could not fork: %s\n", strerror(errno))); return False; } if (child->pid != 0) { /* Parent */ close(fdpair[0]); child->next = child->prev = NULL; DLIST_ADD(children, child); child->event.fd = fdpair[1]; child->event.flags = 0; add_fd_event(&child->event); return True; } /* Child */ DEBUG(10, ("Child process %d\n", (int)sys_getpid())); /* Stop zombies in children */ CatchChild(); state.sock = fdpair[0]; close(fdpair[1]); if (!winbindd_reinit_after_fork(child->logfilename)) { _exit(0); } /* Handle online/offline messages. */ messaging_register(winbind_messaging_context(), NULL, MSG_WINBIND_OFFLINE, child_msg_offline); messaging_register(winbind_messaging_context(), NULL, MSG_WINBIND_ONLINE, child_msg_online); messaging_register(winbind_messaging_context(), NULL, MSG_DUMP_EVENT_LIST, child_msg_dump_event_list); messaging_register(winbind_messaging_context(), NULL, MSG_DEBUG, debug_message); primary_domain = find_our_domain(); if (primary_domain == NULL) { smb_panic("no primary domain found"); } /* It doesn't matter if we allow cache login, * try to bring domain online after fork. */ if ( child->domain ) { child->domain->startup = True; child->domain->startup_time = time(NULL); /* we can be in primary domain or in trusted domain * If we are in trusted domain, set the primary domain * in start-up mode */ if (!(child->domain->internal)) { set_domain_online_request(child->domain); if (!(child->domain->primary)) { primary_domain->startup = True; primary_domain->startup_time = time(NULL); set_domain_online_request(primary_domain); } } } /* * We are in idmap child, make sure that we set the * check_online_event to bring primary domain online. */ if (child == idmap_child()) { set_domain_online_request(primary_domain); } /* We might be in the idmap child...*/ if (child->domain && !(child->domain->internal) && lp_winbind_offline_logon()) { set_domain_online_request(child->domain); if (primary_domain && (primary_domain != child->domain)) { /* We need to talk to the primary * domain as well as the trusted * domain inside a trusted domain * child. * See the code in : * set_dc_type_and_flags_trustinfo() * for details. */ set_domain_online_request(primary_domain); } child->lockout_policy_event = event_add_timed( winbind_event_context(), NULL, timeval_zero(), account_lockout_policy_handler, child); } if (child->domain && child->domain->primary && !USE_KERBEROS_KEYTAB && lp_server_role() == ROLE_DOMAIN_MEMBER) { struct timeval next_change; if (calculate_next_machine_pwd_change(child->domain->name, &next_change)) { child->machine_password_change_event = event_add_timed( winbind_event_context(), NULL, next_change, machine_password_change_handler, child); } } while (1) { int ret; fd_set r_fds; fd_set w_fds; int maxfd; struct timeval t; struct timeval *tp; struct timeval now; TALLOC_CTX *frame = talloc_stackframe(); if (run_events(winbind_event_context(), 0, NULL, NULL)) { TALLOC_FREE(frame); continue; } GetTimeOfDay(&now); if (child->domain && child->domain->startup && (now.tv_sec > child->domain->startup_time + 30)) { /* No longer in "startup" mode. */ DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n", child->domain->name )); child->domain->startup = False; } FD_ZERO(&r_fds); FD_ZERO(&w_fds); FD_SET(state.sock, &r_fds); maxfd = state.sock; event_add_to_select_args(winbind_event_context(), &now, &r_fds, &w_fds, &t, &maxfd); tp = get_timed_events_timeout(winbind_event_context(), &t); if (tp) { DEBUG(11,("select will use timeout of %u.%u seconds\n", (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec )); } ret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, tp); if (run_events(winbind_event_context(), ret, &r_fds, &w_fds)) { /* We got a signal - continue. */ TALLOC_FREE(frame); continue; } if (ret == 0) { DEBUG(11,("nothing is ready yet, continue\n")); TALLOC_FREE(frame); continue; } if (ret == -1 && errno == EINTR) { /* We got a signal - continue. */ TALLOC_FREE(frame); continue; } if (ret == -1 && errno != EINTR) { DEBUG(0,("select error occured\n")); TALLOC_FREE(frame); perror("select"); _exit(1); } /* fetch a request from the main daemon */ child_read_request(&state); if (state.finished) { /* we lost contact with our parent */ _exit(0); } DEBUG(4,("child daemon request %d\n", (int)state.request.cmd)); ZERO_STRUCT(state.response); state.request.null_term = '\0'; child_process_request(child, &state); SAFE_FREE(state.request.extra_data.data); cache_store_response(sys_getpid(), &state.response); /* We just send the result code back, the result * structure needs to be fetched via the * winbindd_cache. Hmm. That needs fixing... */ if (write_data(state.sock, (const char *)&state.response.result, sizeof(state.response.result)) != sizeof(state.response.result)) { DEBUG(0, ("Could not write result\n")); exit(1); } TALLOC_FREE(frame); } }