/* Unix SMB/CIFS implementation. PAC Glue between Samba and the KDC Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2009 Copyright (C) Simo Sorce <idra@samba.org> 2010 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 "../libds/common/flags.h" #include "auth/auth.h" #include "kdc/kdc.h" #include "param/param.h" #include "kdc/pac-glue.h" /* Given the right private pointer from hdb_samba4, get a PAC from the attached ldb messages */ static krb5_error_code samba_wdc_get_pac(void *priv, krb5_context context, struct hdb_entry_ex *client, krb5_pac *pac) { TALLOC_CTX *mem_ctx; DATA_BLOB *pac_blob; krb5_error_code ret; NTSTATUS nt_status; mem_ctx = talloc_named(client->ctx, 0, "samba_get_pac context"); if (!mem_ctx) { return ENOMEM; } nt_status = samba_kdc_get_pac_blob(mem_ctx, client, &pac_blob); if (!NT_STATUS_IS_OK(nt_status)) { talloc_free(mem_ctx); return EINVAL; } ret = samba_make_krb5_pac(context, pac_blob, pac); talloc_free(mem_ctx); return ret; } /* Resign (and reform, including possibly new groups) a PAC */ static krb5_error_code samba_wdc_reget_pac(void *priv, krb5_context context, const krb5_principal client_principal, struct hdb_entry_ex *client, struct hdb_entry_ex *server, struct hdb_entry_ex *krbtgt, krb5_pac *pac) { struct samba_kdc_entry *p = talloc_get_type(server->ctx, struct samba_kdc_entry); TALLOC_CTX *mem_ctx = talloc_named(p, 0, "samba_kdc_reget_pac context"); DATA_BLOB *pac_blob; krb5_error_code ret; NTSTATUS nt_status; if (!mem_ctx) { return ENOMEM; } /* The user account may be set not to want the PAC */ if (!samba_princ_needs_pac(server)) { talloc_free(mem_ctx); return EINVAL; } /* If the krbtgt was generated by an RODC, and we are not that * RODC, then we need to regenerate the PAC - we can't trust * it */ if (samba_krbtgt_was_untrusted_rodc(krbtgt)) { nt_status = samba_kdc_get_pac_blob(mem_ctx, client, &pac_blob); if (!NT_STATUS_IS_OK(nt_status)) { talloc_free(mem_ctx); return EINVAL; } } else { pac_blob = talloc_zero(mem_ctx, DATA_BLOB); if (!pac_blob) { talloc_free(mem_ctx); return ENOMEM; } nt_status = samba_kdc_update_pac_blob(mem_ctx, context, pac, pac_blob); if (!NT_STATUS_IS_OK(nt_status)) { DEBUG(0, ("Building PAC failed: %s\n", nt_errstr(nt_status))); talloc_free(mem_ctx); return EINVAL; } } /* We now completely regenerate this pac */ krb5_pac_free(context, *pac); ret = samba_make_krb5_pac(context, pac_blob, pac); talloc_free(mem_ctx); return ret; } static char *get_netbios_name(TALLOC_CTX *mem_ctx, HostAddresses *addrs) { char *nb_name = NULL; size_t len; unsigned int i; for (i = 0; addrs && i < addrs->len; i++) { if (addrs->val[i].addr_type != KRB5_ADDRESS_NETBIOS) { continue; } len = MIN(addrs->val[i].address.length, 15); nb_name = talloc_strndup(mem_ctx, addrs->val[i].address.data, len); if (nb_name) { break; } } if (nb_name == NULL) { return NULL; } /* Strip space padding */ i = strlen(nb_name) - 1; while (i > 0 && nb_name[i] == ' ') { nb_name[i] = '\0'; } return nb_name; } static krb5_data fill_krb5_data(void *data, size_t length) { krb5_data kdata; kdata.data = data; kdata.length = length; return kdata; } static krb5_error_code samba_wdc_check_client_access(void *priv, krb5_context context, krb5_kdc_configuration *config, hdb_entry_ex *client_ex, const char *client_name, hdb_entry_ex *server_ex, const char *server_name, KDC_REQ *req, krb5_data *e_data) { struct samba_kdc_entry *kdc_entry; bool password_change; char *workstation; NTSTATUS nt_status; kdc_entry = talloc_get_type(client_ex->ctx, struct samba_kdc_entry); password_change = (server_ex && server_ex->entry.flags.change_pw); workstation = get_netbios_name((TALLOC_CTX *)client_ex->ctx, req->req_body.addresses); nt_status = samba_kdc_check_client_access(kdc_entry, client_name, workstation, password_change); if (!NT_STATUS_IS_OK(nt_status)) { if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) { return ENOMEM; } if (e_data) { DATA_BLOB data; samba_kdc_build_edata_reply(nt_status, &data); *e_data = fill_krb5_data(data.data, data.length); } return samba_kdc_map_policy_err(nt_status); } /* Now do the standard Heimdal check */ return kdc_check_flags(context, config, client_ex, client_name, server_ex, server_name, req->msg_type == krb_as_req); } static krb5_error_code samba_wdc_plugin_init(krb5_context context, void **ptr) { *ptr = NULL; return 0; } static void samba_wdc_plugin_fini(void *ptr) { return; } struct krb5plugin_windc_ftable windc_plugin_table = { .minor_version = KRB5_WINDC_PLUGING_MINOR, .init = samba_wdc_plugin_init, .fini = samba_wdc_plugin_fini, .pac_generate = samba_wdc_get_pac, .pac_verify = samba_wdc_reget_pac, .client_access = samba_wdc_check_client_access, };