/* Unix SMB/CIFS implementation. LDAP server Copyright (C) Volker Lendecke 2004 Copyright (C) Stefan Metzmacher 2004 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" /* close the socket and shutdown a server_context */ static void ldapsrv_terminate_connection(struct ldapsrv_connection *ldap_conn, const char *reason) { server_terminate_connection(ldap_conn->connection, reason); } /* add a socket address to the list of events, one event per port */ static void add_socket(struct server_service *service, const struct model_ops *model_ops, struct in_addr *ifip) { struct server_socket *srv_sock; uint16_t port = 389; char *ip_str = talloc_strdup(service, inet_ntoa(*ifip)); srv_sock = service_setup_socket(service, model_ops, ip_str, &port); talloc_free(ip_str); } /**************************************************************************** Open the socket communication. ****************************************************************************/ static void ldapsrv_init(struct server_service *service, const struct model_ops *model_ops) { struct ldapsrv_service *ldap_service; struct ldapsrv_partition *part; DEBUG(10,("ldapsrv_init\n")); ldap_service = talloc_p(service, struct ldapsrv_service); if (!ldap_service) { DEBUG(0,("talloc_p(service, struct ldapsrv_service) failed\n")); return; } ZERO_STRUCTP(ldap_service); part = talloc_p(ldap_service, struct ldapsrv_partition); if (!ldap_service) { DEBUG(0,("talloc_p(ldap_service, struct ldapsrv_partition) failed\n")); return; } part->base_dn = ""; /* RootDSE */ part->ops = ldapsrv_get_rootdse_partition_ops(); ldap_service->rootDSE = part; DLIST_ADD_END(ldap_service->partitions, part, struct ldapsrv_partition *); part = talloc_p(ldap_service, struct ldapsrv_partition); if (!ldap_service) { DEBUG(0,("talloc_p(ldap_service, struct ldapsrv_partition) failed\n")); return; } part->base_dn = "*"; /* default partition */ part->ops = ldapsrv_get_sldb_partition_ops(); ldap_service->default_partition = part; DLIST_ADD_END(ldap_service->partitions, part, struct ldapsrv_partition *); service->private_data = ldap_service; if (lp_interfaces() && lp_bind_interfaces_only()) { int num_interfaces = iface_count(); int i; /* We have been given an interfaces line, and been told to only bind to those interfaces. Create a socket per interface and bind to only these. */ for(i = 0; i < num_interfaces; i++) { struct in_addr *ifip = iface_n_ip(i); if (ifip == NULL) { DEBUG(0,("ldapsrv_init: interface %d has NULL " "IP address !\n", i)); continue; } add_socket(service, model_ops, ifip); } } else { struct in_addr *ifip; /* Just bind to lp_socket_address() (usually 0.0.0.0) */ ifip = interpret_addr2(service, lp_socket_address()); add_socket(service, model_ops, ifip); talloc_destroy(ifip); } } /* This rw-buf api is made to avoid memcpy. For now do that like mad... The idea is to write into a circular list of buffers where the ideal case is that a read(2) holds a complete request that is then thrown away completely. */ static void consumed_from_buf(struct rw_buffer *buf, size_t length) { memcpy(buf->data, buf->data+length, buf->length-length); buf->length -= length; } static void peek_into_read_buf(struct rw_buffer *buf, uint8_t **out, size_t *out_length) { *out = buf->data; *out_length = buf->length; } static BOOL append_to_buf(struct rw_buffer *buf, uint8_t *data, size_t length) { buf->data = realloc(buf->data, buf->length+length); if (buf->data == NULL) return False; memcpy(buf->data+buf->length, data, length); buf->length += length; return True; } static BOOL read_into_buf(struct socket_context *sock, struct rw_buffer *buf) { NTSTATUS status; DATA_BLOB tmp_blob; BOOL ret; status = socket_recv(sock, sock, &tmp_blob, 1024, 0); if (!NT_STATUS_IS_OK(status)) { DEBUG(10,("socket_recv: %s\n",nt_errstr(status))); return False; } ret = append_to_buf(buf, tmp_blob.data, tmp_blob.length); talloc_free(tmp_blob.data); return ret; } static BOOL ldapsrv_read_buf(struct ldapsrv_connection *conn) { NTSTATUS status; DATA_BLOB tmp_blob; DATA_BLOB creds; BOOL ret; uint8_t *buf; int buf_length, sasl_length; struct socket_context *sock = conn->connection->socket; TALLOC_CTX *mem_ctx; if (!conn->gensec || !(gensec_have_feature(conn->gensec, GENSEC_WANT_SIGN) && gensec_have_feature(conn->gensec, GENSEC_WANT_SEAL))) { return read_into_buf(sock, &conn->in_buffer); } mem_ctx = talloc(conn, 0); if (!mem_ctx) { DEBUG(0,("no memory\n")); return False; } status = socket_recv(sock, mem_ctx, &tmp_blob, 1024, 0); if (!NT_STATUS_IS_OK(status)) { DEBUG(10,("socket_recv: %s\n",nt_errstr(status))); talloc_free(mem_ctx); return False; } ret = append_to_buf(&conn->sasl_in_buffer, tmp_blob.data, tmp_blob.length); if (!ret) { talloc_free(mem_ctx); return False; } peek_into_read_buf(&conn->sasl_in_buffer, &buf, &buf_length); if (buf_length < 4) { /* not enough yet */ talloc_free(mem_ctx); return True; } sasl_length = RIVAL(buf, 0); if (buf_length < (4 + sasl_length)) { /* not enough yet */ talloc_free(mem_ctx); return True; } creds.data = buf + 4; creds.length = gensec_sig_size(conn->gensec); if (creds.length > sasl_length) { /* invalid packet? */ talloc_free(mem_ctx); return False; } tmp_blob.data = buf + (4 + creds.length); tmp_blob.length = (4 + sasl_length) - (4 + creds.length); if (gensec_have_feature(conn->gensec, GENSEC_WANT_SEAL)) { status = gensec_unseal_packet(conn->gensec, mem_ctx, tmp_blob.data, tmp_blob.length, tmp_blob.data, tmp_blob.length, &creds); if (!NT_STATUS_IS_OK(status)) { DEBUG(0,("gensec_unseal_packet: %s\n",nt_errstr(status))); talloc_free(mem_ctx); return False; } } else { status = gensec_check_packet(conn->gensec, mem_ctx, tmp_blob.data, tmp_blob.length, tmp_blob.data, tmp_blob.length, &creds); if (!NT_STATUS_IS_OK(status)) { DEBUG(0,("gensec_check_packet: %s\n",nt_errstr(status))); talloc_free(mem_ctx); return False; } } ret = append_to_buf(&conn->in_buffer, tmp_blob.data, tmp_blob.length); if (!ret) { talloc_free(mem_ctx); return False; } consumed_from_buf(&conn->sasl_in_buffer, 4 + sasl_length); talloc_free(mem_ctx); return ret; } static BOOL write_from_buf(struct socket_context *sock, struct rw_buffer *buf) { NTSTATUS status; DATA_BLOB tmp_blob; size_t sendlen; tmp_blob.data = buf->data; tmp_blob.length = buf->length; status = socket_send(sock, sock, &tmp_blob, &sendlen, 0); if (!NT_STATUS_IS_OK(status)) { DEBUG(10,("socket_send() %s\n",nt_errstr(status))); return False; } consumed_from_buf(buf, sendlen); return True; } static BOOL ldapsrv_write_buf(struct ldapsrv_connection *conn) { NTSTATUS status; DATA_BLOB tmp_blob; DATA_BLOB creds; DATA_BLOB sasl; size_t sendlen; BOOL ret; struct socket_context *sock = conn->connection->socket; TALLOC_CTX *mem_ctx; if (!conn->gensec || !(gensec_have_feature(conn->gensec, GENSEC_WANT_SIGN) && gensec_have_feature(conn->gensec, GENSEC_WANT_SEAL))) { return write_from_buf(sock, &conn->out_buffer); } mem_ctx = talloc(conn, 0); if (!mem_ctx) { DEBUG(0,("no memory\n")); return False; } tmp_blob.data = conn->out_buffer.data; tmp_blob.length = conn->out_buffer.length; if (gensec_have_feature(conn->gensec, GENSEC_WANT_SEAL)) { status = gensec_seal_packet(conn->gensec, mem_ctx, tmp_blob.data, tmp_blob.length, tmp_blob.data, tmp_blob.length, &creds); if (!NT_STATUS_IS_OK(status)) { DEBUG(0,("gensec_seal_packet: %s\n",nt_errstr(status))); talloc_free(mem_ctx); return False; } } else { status = gensec_sign_packet(conn->gensec, mem_ctx, tmp_blob.data, tmp_blob.length, tmp_blob.data, tmp_blob.length, &creds); if (!NT_STATUS_IS_OK(status)) { DEBUG(0,("gensec_sign_packet: %s\n",nt_errstr(status))); talloc_free(mem_ctx); return False; } } sasl = data_blob_talloc(mem_ctx, NULL, 4 + creds.length + tmp_blob.length); if (!sasl.data) { DEBUG(0,("no memory\n")); talloc_free(mem_ctx); return False; } RSIVAL(sasl.data, 0, creds.length + tmp_blob.length); memcpy(sasl.data + 4, creds.data, creds.length); memcpy(sasl.data + 4 + creds.length, tmp_blob.data, tmp_blob.length); ret = append_to_buf(&conn->sasl_out_buffer, sasl.data, sasl.length); if (!ret) { talloc_free(mem_ctx); return False; } consumed_from_buf(&conn->out_buffer, tmp_blob.length); status = socket_send(sock, mem_ctx, &tmp_blob, &sendlen, 0); if (!NT_STATUS_IS_OK(status)) { DEBUG(10,("socket_send() %s\n",nt_errstr(status))); talloc_free(mem_ctx); return False; } consumed_from_buf(&conn->sasl_out_buffer, sendlen); talloc_free(mem_ctx); return True; } static BOOL ldap_append_to_buf(struct ldap_message *msg, struct rw_buffer *buf) { DATA_BLOB blob; BOOL res; if (!ldap_encode(msg, &blob)) return False; res = append_to_buf(buf, blob.data, blob.length); data_blob_free(&blob); return res; } static NTSTATUS ldapsrv_do_responses(struct ldapsrv_connection *conn) { struct ldapsrv_call *call, *next_call = NULL; struct ldapsrv_reply *reply, *next_reply = NULL; for (call=conn->calls; call; call=next_call) { for (reply=call->replies; reply; reply=next_reply) { if (!ldap_append_to_buf(&reply->msg, &conn->out_buffer)) { return NT_STATUS_FOOBAR; } next_reply = reply->next; DLIST_REMOVE(call->replies, reply); reply->state = LDAPSRV_REPLY_STATE_SEND; talloc_free(reply); } next_call = call->next; DLIST_REMOVE(conn->calls, call); call->state = LDAPSRV_CALL_STATE_COMPLETE; talloc_free(call); } return NT_STATUS_OK; } /* called when a LDAP socket becomes readable */ static void ldapsrv_recv(struct server_connection *conn, time_t t, uint16_t flags) { struct ldapsrv_connection *ldap_conn = conn->private_data; uint8_t *buf; int buf_length, msg_length; DATA_BLOB blob; ASN1_DATA data; struct ldapsrv_call *call; NTSTATUS status; DEBUG(10,("ldapsrv_recv\n")); if (!ldapsrv_read_buf(ldap_conn)) { ldapsrv_terminate_connection(ldap_conn, "ldapsrv_read_buf() failed"); return; } peek_into_read_buf(&ldap_conn->in_buffer, &buf, &buf_length); while (buf_length > 0) { /* LDAP Messages are always SEQUENCES */ if (!asn1_object_length(buf, buf_length, ASN1_SEQUENCE(0), &msg_length)) { ldapsrv_terminate_connection(ldap_conn, "asn1_object_length() failed"); return; } if (buf_length < msg_length) { /* Not enough yet */ break; } /* We've got a complete LDAP request in the in-buffer, convert * that to a ldap_message and put it into the incoming * queue. */ blob.data = buf; blob.length = msg_length; if (!asn1_load(&data, blob)) { ldapsrv_terminate_connection(ldap_conn, "asn1_load() failed"); return; } call = talloc_p(ldap_conn, struct ldapsrv_call); if (!call) { ldapsrv_terminate_connection(ldap_conn, "no memory"); return; } ZERO_STRUCTP(call); call->state = LDAPSRV_CALL_STATE_NEW; call->conn = ldap_conn; /* TODO: we should use talloc_reference() here */ call->session_info = ldap_conn->session_info; call->request.mem_ctx = call; if (!ldap_decode(&data, &call->request)) { dump_data(0,buf, msg_length); asn1_free(&data); ldapsrv_terminate_connection(ldap_conn, "ldap_decode() failed"); return; } asn1_free(&data); DLIST_ADD_END(ldap_conn->calls, call, struct ldapsrv_call *); consumed_from_buf(&ldap_conn->in_buffer, msg_length); status = ldapsrv_do_call(call); if (!NT_STATUS_IS_OK(status)) { ldapsrv_terminate_connection(ldap_conn, "ldapsrv_do_call() failed"); return; } peek_into_read_buf(&ldap_conn->in_buffer, &buf, &buf_length); } status = ldapsrv_do_responses(ldap_conn); if (!NT_STATUS_IS_OK(status)) { ldapsrv_terminate_connection(ldap_conn, "ldapsrv_do_responses() failed"); return; } if ((ldap_conn->out_buffer.length > 0)||(ldap_conn->sasl_out_buffer.length > 0)) { conn->event.fde->flags |= EVENT_FD_WRITE; } return; } /* called when a LDAP socket becomes writable */ static void ldapsrv_send(struct server_connection *conn, time_t t, uint16_t flags) { struct ldapsrv_connection *ldap_conn = conn->private_data; DEBUG(10,("ldapsrv_send\n")); if (!ldapsrv_write_buf(ldap_conn)) { ldapsrv_terminate_connection(ldap_conn, "ldapsrv_write_buf() failed"); return; } if (ldap_conn->out_buffer.length == 0 && ldap_conn->sasl_out_buffer.length == 0) { conn->event.fde->flags &= ~EVENT_FD_WRITE; } return; } /* called when connection is idle */ static void ldapsrv_idle(struct server_connection *conn, time_t t) { DEBUG(10,("ldapsrv_idle: not implemented!\n")); return; } static void ldapsrv_close(struct server_connection *conn, const char *reason) { return; } /* initialise a server_context from a open socket and register a event handler for reading from that socket */ static void ldapsrv_accept(struct server_connection *conn) { struct ldapsrv_connection *ldap_conn; DEBUG(10, ("ldapsrv_accept\n")); ldap_conn = talloc_p(conn, struct ldapsrv_connection); if (ldap_conn == NULL) return; ZERO_STRUCTP(ldap_conn); ldap_conn->connection = conn; ldap_conn->service = talloc_reference(ldap_conn, conn->service->private_data); conn->private_data = ldap_conn; return; } /* called on a fatal error that should cause this server to terminate */ static void ldapsrv_exit(struct server_service *service, const char *reason) { DEBUG(10,("ldapsrv_exit\n")); return; } static const struct server_service_ops ldap_server_ops = { .name = "ldap", .service_init = ldapsrv_init, .accept_connection = ldapsrv_accept, .recv_handler = ldapsrv_recv, .send_handler = ldapsrv_send, .idle_handler = ldapsrv_idle, .close_connection = ldapsrv_close, .service_exit = ldapsrv_exit, }; const struct server_service_ops *ldapsrv_get_ops(void) { return &ldap_server_ops; } NTSTATUS server_service_ldap_init(void) { return NT_STATUS_OK; }