/* 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 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 "system/kerberos.h" #include "auth/kerberos/kerberos.h" #include "lib/socket/socket.h" #include "system/network.h" #include "lib/events/events.h" #include "roken.h" /* context structure for operations on cldap packets */ struct smb_krb5_socket { struct socket_context *sock; /* the fd event */ struct fd_event *fde; BOOL timeout; NTSTATUS status; DATA_BLOB request, reply, partial; size_t partial_read; krb5_krbhst_info *hi; }; static int smb_krb5_context_destroy_1(struct smb_krb5_context *ctx) { krb5_free_context(ctx->krb5_context); return 0; } static int 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) { return; } static void smb_krb5_debug_wrapper(const char *timestr, const char *msg, void *private) { DEBUG(3, ("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; switch (smb_krb5->hi->proto) { case KRB5_KRBHST_UDP: 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); break; case KRB5_KRBHST_TCP: if (smb_krb5->partial.length == 0) { smb_krb5->partial = data_blob_talloc(smb_krb5, NULL, 4); if (!smb_krb5->partial.data) { smb_krb5->status = NT_STATUS_NO_MEMORY; return; } smb_krb5->partial_read = 0; } /* read in the packet length */ if (smb_krb5->partial_read < 4) { uint32_t packet_length; smb_krb5->status = socket_recv(smb_krb5->sock, smb_krb5->partial.data + smb_krb5->partial_read, 4 - smb_krb5->partial_read, &nread); /* todo: this should be converted to the packet_*() routines */ if (!NT_STATUS_IS_OK(smb_krb5->status)) { return; } smb_krb5->partial_read += nread; if (smb_krb5->partial_read != 4) { return; } packet_length = RIVAL(smb_krb5->partial.data, 0); smb_krb5->partial.data = talloc_realloc(smb_krb5, smb_krb5->partial.data, uint8_t, packet_length + 4); if (!smb_krb5->partial.data) { smb_krb5->status = NT_STATUS_NO_MEMORY; return; } smb_krb5->partial.length = packet_length + 4; } /* read in the body */ smb_krb5->status = socket_recv(smb_krb5->sock, smb_krb5->partial.data + smb_krb5->partial_read, smb_krb5->partial.length - smb_krb5->partial_read, &nread); if (!NT_STATUS_IS_OK(smb_krb5->status)) return; smb_krb5->partial_read += nread; if (smb_krb5->partial_read != smb_krb5->partial.length) return; smb_krb5->reply = data_blob_talloc(smb_krb5, smb_krb5->partial.data + 4, smb_krb5->partial.length - 4); break; case KRB5_KRBHST_HTTP: return; } } /* handle request timeouts */ static void smb_krb5_request_timeout(struct event_context *event_ctx, struct timed_event *te, struct timeval t, void *private) { struct smb_krb5_socket *smb_krb5 = talloc_get_type(private, struct smb_krb5_socket); DEBUG(5,("Timed out smb_krb5 packet\n")); smb_krb5->timeout = True; } /* 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; EVENT_FD_READABLE(smb_krb5->fde); EVENT_FD_NOT_WRITEABLE(smb_krb5->fde); return; } /* handle fd events on a smb_krb5_socket */ static void smb_krb5_socket_handler(struct event_context *ev, struct fd_event *fde, uint16_t flags, void *private) { struct smb_krb5_socket *smb_krb5 = talloc_get_type(private, struct smb_krb5_socket); if (flags & EVENT_FD_WRITE) { smb_krb5_socket_send(smb_krb5); } if (flags & EVENT_FD_READ) { smb_krb5_socket_recv(smb_krb5); } } static krb5_error_code smb_krb5_send_and_recv_func(krb5_context context, void *data, krb5_krbhst_info *hi, 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 event_context *ev = talloc_get_type(data, struct event_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_SOCKET_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: if (lp_parm_bool(-1, "krb5", "udp", True)) { status = socket_create(name, SOCKET_TYPE_DGRAM, &smb_krb5->sock, 0); } break; case KRB5_KRBHST_TCP: if (lp_parm_bool(-1, "krb5", "tcp", True)) { 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); smb_krb5->fde = event_add_fd(ev, smb_krb5, socket_get_fd(smb_krb5->sock), 0, smb_krb5_socket_handler, smb_krb5); event_add_timed(ev, smb_krb5, timeval_current_ofs(context->kdc_timeout, 0), smb_krb5_request_timeout, smb_krb5); EVENT_FD_WRITEABLE(smb_krb5->fde); switch (hi->proto) { case KRB5_KRBHST_UDP: smb_krb5->request = send_blob; break; case KRB5_KRBHST_TCP: 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); break; case KRB5_KRBHST_HTTP: talloc_free(smb_krb5); return EINVAL; } smb_krb5->timeout = False; smb_krb5->status = NT_STATUS_OK; smb_krb5->reply = data_blob(NULL, 0); smb_krb5->partial = data_blob(NULL, 0); while (!smb_krb5->timeout && (NT_STATUS_IS_OK(smb_krb5->status)) && !smb_krb5->reply.length) { if (event_loop_once(ev) != 0) { talloc_free(smb_krb5); return EINVAL; } } 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; } if (smb_krb5->timeout) { 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; } /* NO internal data, so nothing to free */ static void smb_krb5_send_and_recv_close_func(krb5_context context, void *data) { return; } krb5_error_code smb_krb5_init_context(void *parent_ctx, struct smb_krb5_context **smb_krb5_context) { krb5_error_code ret; TALLOC_CTX *tmp_ctx; struct event_context *ev; 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(*smb_krb5_context); 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))); return ret; } talloc_set_destructor(*smb_krb5_context, smb_krb5_context_destroy_1); if (lp_realm() && *lp_realm()) { char *upper_realm = strupper_talloc(tmp_ctx, lp_realm()); if (!upper_realm) { DEBUG(1,("gensec_krb5_start: could not uppercase realm: %s\n", lp_realm())); 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); ev = event_context_find(*smb_krb5_context); /* Set use of our socket lib */ ret = krb5_set_send_recv_func((*smb_krb5_context)->krb5_context, smb_krb5_send_and_recv_func, smb_krb5_send_and_recv_close_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; } (*smb_krb5_context)->krb5_context->mem_ctx = *smb_krb5_context; talloc_steal(parent_ctx, *smb_krb5_context); talloc_free(tmp_ctx); /* Set options in kerberos */ (*smb_krb5_context)->krb5_context->fdns = FALSE; return 0; } void smb_krb5_free_context(struct smb_krb5_context *smb_krb5_context) { talloc_free(smb_krb5_context); }