/* Unix SMB/CIFS implementation. KDC Server startup Copyright (C) Andrew Bartlett 2005 Copyright (C) Andrew Tridgell 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 2 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, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "includes.h" #include "smbd/service_task.h" #include "lib/events/events.h" #include "lib/socket/socket.h" #include "kdc/kdc.h" #include "system/network.h" #include "dlinklist.h" /* handle fd send events on a KDC socket */ static void kdc_send_handler(struct kdc_socket *kdc_socket) { while (kdc_socket->send_queue) { struct kdc_reply *rep = kdc_socket->send_queue; NTSTATUS status; size_t sendlen; status = socket_sendto(kdc_socket->sock, &rep->packet, &sendlen, 0, rep->dest_address, rep->dest_port); if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) { break; } DLIST_REMOVE(kdc_socket->send_queue, rep); talloc_free(rep); } if (kdc_socket->send_queue == NULL) { EVENT_FD_NOT_WRITEABLE(kdc_socket->fde); } } /* handle fd recv events on a KDC socket */ static void kdc_recv_handler(struct kdc_socket *kdc_socket) { NTSTATUS status; TALLOC_CTX *tmp_ctx = talloc_new(kdc_socket); DATA_BLOB blob; struct kdc_reply *rep; krb5_data reply; size_t nread, dsize; const char *src_addr; int src_port; struct sockaddr_in src_sock_addr; struct ipv4_addr addr; int ret; status = socket_pending(kdc_socket->sock, &dsize); if (!NT_STATUS_IS_OK(status)) { talloc_free(tmp_ctx); return; } blob = data_blob_talloc(kdc_socket, NULL, dsize); if (blob.data == NULL) { /* hope this is a temporary low memory condition */ talloc_free(tmp_ctx); return; } status = socket_recvfrom(kdc_socket->sock, blob.data, blob.length, &nread, 0, &src_addr, &src_port); if (!NT_STATUS_IS_OK(status)) { talloc_free(tmp_ctx); return; } talloc_steal(tmp_ctx, src_addr); blob.length = nread; DEBUG(2,("Received krb5 packet of length %d from %s:%d\n", blob.length, src_addr, src_port)); /* TODO: This really should be in a utility function somewhere */ ZERO_STRUCT(src_sock_addr); #ifdef HAVE_SOCK_SIN_LEN src_sock_addr.sin_len = sizeof(src_sock_addr); #endif addr = interpret_addr2(src_addr); src_sock_addr.sin_addr.s_addr = addr.addr; src_sock_addr.sin_port = htons(src_port); src_sock_addr.sin_family = PF_INET; /* Call krb5 */ ret = krb5_kdc_process_krb5_request(kdc_socket->kdc->smb_krb5_context->krb5_context, kdc_socket->kdc->config, blob.data, blob.length, &reply, src_addr, (struct sockaddr *)&src_sock_addr); if (ret == -1) { talloc_free(tmp_ctx); return; } /* queue a pending reply */ rep = talloc(kdc_socket, struct kdc_reply); if (rep == NULL) { krb5_data_free(&reply); talloc_free(tmp_ctx); return; } rep->dest_address = talloc_steal(rep, src_addr); rep->dest_port = src_port; rep->packet = data_blob_talloc(rep, reply.data, reply.length); krb5_data_free(&reply); if (rep->packet.data == NULL) { talloc_free(rep); talloc_free(tmp_ctx); return; } DLIST_ADD_END(kdc_socket->send_queue, rep, struct kdc_reply *); EVENT_FD_WRITEABLE(kdc_socket->fde); talloc_free(tmp_ctx); } /* handle fd events on a KDC socket */ static void kdc_socket_handler(struct event_context *ev, struct fd_event *fde, uint16_t flags, void *private) { struct kdc_socket *kdc_socket = talloc_get_type(private, struct kdc_socket); if (flags & EVENT_FD_WRITE) { kdc_send_handler(kdc_socket); } if (flags & EVENT_FD_READ) { kdc_recv_handler(kdc_socket); } } /* start listening on the given address */ static NTSTATUS kdc_add_socket(struct kdc_server *kdc, const char *address) { struct kdc_socket *kdc_socket; NTSTATUS status; kdc_socket = talloc(kdc, struct kdc_socket); NT_STATUS_HAVE_NO_MEMORY(kdc_socket); status = socket_create("ip", SOCKET_TYPE_DGRAM, &kdc_socket->sock, 0); if (!NT_STATUS_IS_OK(status)) { talloc_free(kdc_socket); return status; } kdc_socket->kdc = kdc; kdc_socket->send_queue = NULL; talloc_steal(kdc_socket, kdc_socket->sock); kdc_socket->fde = event_add_fd(kdc->task->event_ctx, kdc, socket_get_fd(kdc_socket->sock), EVENT_FD_READ, kdc_socket_handler, kdc_socket); status = socket_listen(kdc_socket->sock, address, lp_krb5_port(), 0, 0); if (!NT_STATUS_IS_OK(status)) { DEBUG(0,("Failed to bind to %s:%d - %s\n", address, lp_krb5_port(), nt_errstr(status))); talloc_free(kdc_socket); return status; } return NT_STATUS_OK; } /* setup our listening sockets on the configured network interfaces */ NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc) { int num_interfaces = iface_count(); TALLOC_CTX *tmp_ctx = talloc_new(kdc); NTSTATUS status; /* if we are allowing incoming packets from any address, then we need to bind to the wildcard address */ if (!lp_bind_interfaces_only()) { status = kdc_add_socket(kdc, "0.0.0.0"); NT_STATUS_NOT_OK_RETURN(status); } else { int i; for (i=0; itask = task; /* Setup the KDC configuration */ kdc->config = talloc(kdc, struct krb5_kdc_configuration); if (!kdc->config) { task_server_terminate(task, "kdc: out of memory"); return; } krb5_kdc_default_config(kdc->config); /* NAT and the like make this pointless, and painful */ kdc->config->check_ticket_addresses = FALSE; initialize_krb5_error_table(); ret = smb_krb5_init_context(kdc, &kdc->smb_krb5_context); if (ret) { DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n", error_message(ret))); task_server_terminate(task, "kdc: krb5_init_context failed"); return; } kdc->config->logf = kdc->smb_krb5_context->logf; kdc->config->db = talloc(kdc->config, struct HDB *); if (!kdc->config->db) { task_server_terminate(task, "kdc: out of memory"); return; } kdc->config->num_db = 1; ret = hdb_ldb_create(kdc->smb_krb5_context->krb5_context, &kdc->config->db[0], lp_sam_url()); if (ret != 0) { DEBUG(1, ("kdc_task_init: hdb_ldb_create fails: %s\n", smb_get_krb5_error_message(kdc->smb_krb5_context->krb5_context, ret, kdc))); task_server_terminate(task, "kdc: hdb_ldb_create failed"); return; } /* start listening on the configured network interfaces */ status = kdc_startup_interfaces(kdc); if (!NT_STATUS_IS_OK(status)) { task_server_terminate(task, "kdc failed to setup interfaces"); return; } } /* called on startup of the KDC service */ static NTSTATUS kdc_init(struct event_context *event_ctx, const struct model_ops *model_ops) { return task_server_startup(event_ctx, model_ops, kdc_task_init); } /* called at smbd startup - register ourselves as a server service */ NTSTATUS server_service_kdc_init(void) { return register_server_service("kdc", kdc_init); }