/* Unix SMB/CIFS implementation. Wrapper for krb5_init_context Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005 Copyright (C) Andrew Tridgell 2005 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 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/>. */ #include "includes.h" #include "system/kerberos.h" #include <tevent.h> #include "auth/kerberos/kerberos.h" #include "lib/socket/socket.h" #include "lib/stream/packet.h" #include "system/network.h" #include "param/param.h" #include "libcli/resolve/resolve.h" /* context structure for operations on cldap packets */ struct smb_krb5_socket { struct socket_context *sock; /* the fd event */ struct tevent_fd *fde; NTSTATUS status; DATA_BLOB request, reply; struct packet_context *packet; size_t partial_read; krb5_krbhst_info *hi; }; static krb5_error_code smb_krb5_context_destroy_1(struct smb_krb5_context *ctx) { krb5_free_context(ctx->krb5_context); return 0; } static krb5_error_code smb_krb5_context_destroy_2(struct smb_krb5_context *ctx) { /* Otherwise krb5_free_context will try and close what we have already free()ed */ krb5_set_warn_dest(ctx->krb5_context, NULL); krb5_closelog(ctx->krb5_context, ctx->logf); smb_krb5_context_destroy_1(ctx); return 0; } /* We never close down the DEBUG system, and no need to unreference the use */ static void smb_krb5_debug_close(void *private_data) { return; } static void smb_krb5_debug_wrapper(const char *timestr, const char *msg, void *private_data) { DEBUG(2, ("Kerberos: %s\n", msg)); } /* handle recv events on a smb_krb5 socket */ static void smb_krb5_socket_recv(struct smb_krb5_socket *smb_krb5) { TALLOC_CTX *tmp_ctx = talloc_new(smb_krb5); DATA_BLOB blob; size_t nread, dsize; smb_krb5->status = socket_pending(smb_krb5->sock, &dsize); if (!NT_STATUS_IS_OK(smb_krb5->status)) { talloc_free(tmp_ctx); return; } blob = data_blob_talloc(tmp_ctx, NULL, dsize); if (blob.data == NULL && dsize != 0) { smb_krb5->status = NT_STATUS_NO_MEMORY; talloc_free(tmp_ctx); return; } smb_krb5->status = socket_recv(smb_krb5->sock, blob.data, blob.length, &nread); if (!NT_STATUS_IS_OK(smb_krb5->status)) { talloc_free(tmp_ctx); return; } blob.length = nread; if (nread == 0) { smb_krb5->status = NT_STATUS_UNEXPECTED_NETWORK_ERROR; talloc_free(tmp_ctx); return; } DEBUG(2,("Received smb_krb5 packet of length %d\n", (int)blob.length)); talloc_steal(smb_krb5, blob.data); smb_krb5->reply = blob; talloc_free(tmp_ctx); } static NTSTATUS smb_krb5_full_packet(void *private_data, DATA_BLOB data) { struct smb_krb5_socket *smb_krb5 = talloc_get_type(private_data, struct smb_krb5_socket); talloc_steal(smb_krb5, data.data); smb_krb5->reply = data; smb_krb5->reply.length -= 4; smb_krb5->reply.data += 4; return NT_STATUS_OK; } /* handle request timeouts */ static void smb_krb5_request_timeout(struct tevent_context *event_ctx, struct tevent_timer *te, struct timeval t, void *private_data) { struct smb_krb5_socket *smb_krb5 = talloc_get_type(private_data, struct smb_krb5_socket); DEBUG(5,("Timed out smb_krb5 packet\n")); smb_krb5->status = NT_STATUS_IO_TIMEOUT; } static void smb_krb5_error_handler(void *private_data, NTSTATUS status) { struct smb_krb5_socket *smb_krb5 = talloc_get_type(private_data, struct smb_krb5_socket); smb_krb5->status = status; } /* handle send events on a smb_krb5 socket */ static void smb_krb5_socket_send(struct smb_krb5_socket *smb_krb5) { NTSTATUS status; size_t len; len = smb_krb5->request.length; status = socket_send(smb_krb5->sock, &smb_krb5->request, &len); if (!NT_STATUS_IS_OK(status)) return; TEVENT_FD_READABLE(smb_krb5->fde); TEVENT_FD_NOT_WRITEABLE(smb_krb5->fde); return; } /* handle fd events on a smb_krb5_socket */ static void smb_krb5_socket_handler(struct tevent_context *ev, struct tevent_fd *fde, uint16_t flags, void *private_data) { struct smb_krb5_socket *smb_krb5 = talloc_get_type(private_data, struct smb_krb5_socket); switch (smb_krb5->hi->proto) { case KRB5_KRBHST_UDP: if (flags & TEVENT_FD_READ) { smb_krb5_socket_recv(smb_krb5); return; } if (flags & TEVENT_FD_WRITE) { smb_krb5_socket_send(smb_krb5); return; } /* not reached */ return; case KRB5_KRBHST_TCP: if (flags & TEVENT_FD_READ) { packet_recv(smb_krb5->packet); return; } if (flags & TEVENT_FD_WRITE) { packet_queue_run(smb_krb5->packet); return; } /* not reached */ return; case KRB5_KRBHST_HTTP: /* can't happen */ break; } } krb5_error_code smb_krb5_send_and_recv_func(krb5_context context, void *data, krb5_krbhst_info *hi, time_t timeout, const krb5_data *send_buf, krb5_data *recv_buf) { krb5_error_code ret; NTSTATUS status; struct socket_address *remote_addr; const char *name; struct addrinfo *ai, *a; struct smb_krb5_socket *smb_krb5; struct tevent_context *ev = talloc_get_type(data, struct tevent_context); DATA_BLOB send_blob = data_blob_const(send_buf->data, send_buf->length); ret = krb5_krbhst_get_addrinfo(context, hi, &ai); if (ret) { return ret; } for (a = ai; a; a = ai->ai_next) { smb_krb5 = talloc(NULL, struct smb_krb5_socket); if (!smb_krb5) { return ENOMEM; } smb_krb5->hi = hi; switch (a->ai_family) { case PF_INET: name = "ipv4"; break; #ifdef HAVE_IPV6 case PF_INET6: name = "ipv6"; break; #endif default: talloc_free(smb_krb5); return EINVAL; } status = NT_STATUS_INVALID_PARAMETER; switch (hi->proto) { case KRB5_KRBHST_UDP: status = socket_create(name, SOCKET_TYPE_DGRAM, &smb_krb5->sock, 0); break; case KRB5_KRBHST_TCP: status = socket_create(name, SOCKET_TYPE_STREAM, &smb_krb5->sock, 0); break; case KRB5_KRBHST_HTTP: talloc_free(smb_krb5); return EINVAL; } if (!NT_STATUS_IS_OK(status)) { talloc_free(smb_krb5); continue; } talloc_steal(smb_krb5, smb_krb5->sock); remote_addr = socket_address_from_sockaddr(smb_krb5, a->ai_addr, a->ai_addrlen); if (!remote_addr) { talloc_free(smb_krb5); continue; } status = socket_connect_ev(smb_krb5->sock, NULL, remote_addr, 0, ev); if (!NT_STATUS_IS_OK(status)) { talloc_free(smb_krb5); continue; } talloc_free(remote_addr); /* Setup the FDE, start listening for read events * from the start (otherwise we may miss a socket * drop) and mark as AUTOCLOSE along with the fde */ /* Ths is equivilant to EVENT_FD_READABLE(smb_krb5->fde) */ smb_krb5->fde = tevent_add_fd(ev, smb_krb5->sock, socket_get_fd(smb_krb5->sock), TEVENT_FD_READ, smb_krb5_socket_handler, smb_krb5); /* its now the job of the event layer to close the socket */ tevent_fd_set_close_fn(smb_krb5->fde, socket_tevent_fd_close_fn); socket_set_flags(smb_krb5->sock, SOCKET_FLAG_NOCLOSE); tevent_add_timer(ev, smb_krb5, timeval_current_ofs(timeout, 0), smb_krb5_request_timeout, smb_krb5); smb_krb5->status = NT_STATUS_OK; smb_krb5->reply = data_blob(NULL, 0); switch (hi->proto) { case KRB5_KRBHST_UDP: TEVENT_FD_WRITEABLE(smb_krb5->fde); smb_krb5->request = send_blob; break; case KRB5_KRBHST_TCP: smb_krb5->packet = packet_init(smb_krb5); if (smb_krb5->packet == NULL) { talloc_free(smb_krb5); return ENOMEM; } packet_set_private(smb_krb5->packet, smb_krb5); packet_set_socket(smb_krb5->packet, smb_krb5->sock); packet_set_callback(smb_krb5->packet, smb_krb5_full_packet); packet_set_full_request(smb_krb5->packet, packet_full_request_u32); packet_set_error_handler(smb_krb5->packet, smb_krb5_error_handler); packet_set_event_context(smb_krb5->packet, ev); packet_set_fde(smb_krb5->packet, smb_krb5->fde); smb_krb5->request = data_blob_talloc(smb_krb5, NULL, send_blob.length + 4); RSIVAL(smb_krb5->request.data, 0, send_blob.length); memcpy(smb_krb5->request.data+4, send_blob.data, send_blob.length); packet_send(smb_krb5->packet, smb_krb5->request); break; case KRB5_KRBHST_HTTP: talloc_free(smb_krb5); return EINVAL; } while ((NT_STATUS_IS_OK(smb_krb5->status)) && !smb_krb5->reply.length) { if (tevent_loop_once(ev) != 0) { talloc_free(smb_krb5); return EINVAL; } } if (NT_STATUS_EQUAL(smb_krb5->status, NT_STATUS_IO_TIMEOUT)) { talloc_free(smb_krb5); continue; } if (!NT_STATUS_IS_OK(smb_krb5->status)) { DEBUG(2,("Error reading smb_krb5 reply packet: %s\n", nt_errstr(smb_krb5->status))); talloc_free(smb_krb5); continue; } ret = krb5_data_copy(recv_buf, smb_krb5->reply.data, smb_krb5->reply.length); if (ret) { talloc_free(smb_krb5); return ret; } talloc_free(smb_krb5); break; } if (a) { return 0; } return KRB5_KDC_UNREACH; } krb5_error_code smb_krb5_init_context(void *parent_ctx, struct tevent_context *ev, struct loadparm_context *lp_ctx, struct smb_krb5_context **smb_krb5_context) { krb5_error_code ret; TALLOC_CTX *tmp_ctx; char **config_files; const char *config_file; initialize_krb5_error_table(); tmp_ctx = talloc_new(parent_ctx); *smb_krb5_context = talloc(tmp_ctx, struct smb_krb5_context); if (!*smb_krb5_context || !tmp_ctx) { talloc_free(tmp_ctx); return ENOMEM; } ret = krb5_init_context(&(*smb_krb5_context)->krb5_context); if (ret) { DEBUG(1,("krb5_init_context failed (%s)\n", error_message(ret))); talloc_free(tmp_ctx); return ret; } talloc_set_destructor(*smb_krb5_context, smb_krb5_context_destroy_1); config_file = config_path(tmp_ctx, lp_ctx, "krb5.conf"); if (!config_file) { talloc_free(tmp_ctx); return ENOMEM; } /* Use our local krb5.conf file by default */ ret = krb5_prepend_config_files_default(config_file == NULL?"":config_file, &config_files); if (ret) { DEBUG(1,("krb5_prepend_config_files_default failed (%s)\n", smb_get_krb5_error_message((*smb_krb5_context)->krb5_context, ret, tmp_ctx))); talloc_free(tmp_ctx); return ret; } ret = krb5_set_config_files((*smb_krb5_context)->krb5_context, config_files); krb5_free_config_files(config_files); if (ret) { DEBUG(1,("krb5_set_config_files failed (%s)\n", smb_get_krb5_error_message((*smb_krb5_context)->krb5_context, ret, tmp_ctx))); talloc_free(tmp_ctx); return ret; } if (lp_realm(lp_ctx) && *lp_realm(lp_ctx)) { char *upper_realm = strupper_talloc(tmp_ctx, lp_realm(lp_ctx)); if (!upper_realm) { DEBUG(1,("gensec_krb5_start: could not uppercase realm: %s\n", lp_realm(lp_ctx))); talloc_free(tmp_ctx); return ENOMEM; } ret = krb5_set_default_realm((*smb_krb5_context)->krb5_context, upper_realm); if (ret) { DEBUG(1,("krb5_set_default_realm failed (%s)\n", smb_get_krb5_error_message((*smb_krb5_context)->krb5_context, ret, tmp_ctx))); talloc_free(tmp_ctx); return ret; } } /* TODO: Should we have a different name here? */ ret = krb5_initlog((*smb_krb5_context)->krb5_context, "Samba", &(*smb_krb5_context)->logf); if (ret) { DEBUG(1,("krb5_initlog failed (%s)\n", smb_get_krb5_error_message((*smb_krb5_context)->krb5_context, ret, tmp_ctx))); talloc_free(tmp_ctx); return ret; } talloc_set_destructor(*smb_krb5_context, smb_krb5_context_destroy_2); ret = krb5_addlog_func((*smb_krb5_context)->krb5_context, (*smb_krb5_context)->logf, 0 /* min */, -1 /* max */, smb_krb5_debug_wrapper, smb_krb5_debug_close, NULL); if (ret) { DEBUG(1,("krb5_addlog_func failed (%s)\n", smb_get_krb5_error_message((*smb_krb5_context)->krb5_context, ret, tmp_ctx))); talloc_free(tmp_ctx); return ret; } krb5_set_warn_dest((*smb_krb5_context)->krb5_context, (*smb_krb5_context)->logf); /* Set use of our socket lib */ ret = krb5_set_send_to_kdc_func((*smb_krb5_context)->krb5_context, smb_krb5_send_and_recv_func, ev); if (ret) { DEBUG(1,("krb5_set_send_recv_func failed (%s)\n", smb_get_krb5_error_message((*smb_krb5_context)->krb5_context, ret, tmp_ctx))); talloc_free(tmp_ctx); return ret; } talloc_steal(parent_ctx, *smb_krb5_context); talloc_free(tmp_ctx); /* Set options in kerberos */ krb5_set_dns_canonicalize_hostname((*smb_krb5_context)->krb5_context, lp_parm_bool(lp_ctx, NULL, "krb5", "set_dns_canonicalize", false)); return 0; }