LXR qemu/authz/pamacct.c

   1/*
   2 * QEMU PAM authorization driver
   3 *
   4 * Copyright (c) 2018 Red Hat, Inc.
   5 *
   6 * This library is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU Lesser General Public
   8 * License as published by the Free Software Foundation; either
   9 * version 2 of the License, or (at your option) any later version.
  10 *
  11 * This library is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 * Lesser General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU Lesser General Public
  17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18 *
  19 */
  20
  21#include "qemu/osdep.h"
  22#include "authz/pamacct.h"
  23#include "authz/trace.h"
  24#include "qom/object_interfaces.h"
  25
  26#include <security/pam_appl.h>
  27
  28
  29static bool qauthz_pam_is_allowed(QAuthZ *authz,
  30                                  const char *identity,
  31                                  Error **errp)
  32{
  33    QAuthZPAM *pauthz = QAUTHZ_PAM(authz);
  34    const struct pam_conv pam_conversation = { 0 };
  35    pam_handle_t *pamh = NULL;
  36    int ret;
  37
  38    trace_qauthz_pam_check(authz, identity, pauthz->service);
  39    ret = pam_start(pauthz->service,
  40                    identity,
  41                    &pam_conversation,
  42                    &pamh);
  43    if (ret != PAM_SUCCESS) {
  44        error_setg(errp, "Unable to start PAM transaction: %s",
  45                   pam_strerror(NULL, ret));
  46        return false;
  47    }
  48
  49    ret = pam_acct_mgmt(pamh, PAM_SILENT);
  50    pam_end(pamh, ret);
  51    if (ret != PAM_SUCCESS) {
  52        error_setg(errp, "Unable to authorize user '%s': %s",
  53                   identity, pam_strerror(pamh, ret));
  54        return false;
  55    }
  56
  57    return true;
  58}
  59
  60
  61static void
  62qauthz_pam_prop_set_service(Object *obj,
  63                            const char *service,
  64                            Error **errp G_GNUC_UNUSED)
  65{
  66    QAuthZPAM *pauthz = QAUTHZ_PAM(obj);
  67
  68    g_free(pauthz->service);
  69    pauthz->service = g_strdup(service);
  70}
  71
  72
  73static char *
  74qauthz_pam_prop_get_service(Object *obj,
  75                            Error **errp G_GNUC_UNUSED)
  76{
  77    QAuthZPAM *pauthz = QAUTHZ_PAM(obj);
  78
  79    return g_strdup(pauthz->service);
  80}
  81
  82
  83static void
  84qauthz_pam_complete(UserCreatable *uc, Error **errp)
  85{
  86}
  87
  88
  89static void
  90qauthz_pam_finalize(Object *obj)
  91{
  92    QAuthZPAM *pauthz = QAUTHZ_PAM(obj);
  93
  94    g_free(pauthz->service);
  95}
  96
  97
  98static void
  99qauthz_pam_class_init(ObjectClass *oc, void *data)
 100{
 101    UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
 102    QAuthZClass *authz = QAUTHZ_CLASS(oc);
 103
 104    ucc->complete = qauthz_pam_complete;
 105    authz->is_allowed = qauthz_pam_is_allowed;
 106
 107    object_class_property_add_str(oc, "service",
 108                                  qauthz_pam_prop_get_service,
 109                                  qauthz_pam_prop_set_service,
 110                                  NULL);
 111}
 112
 113
 114QAuthZPAM *qauthz_pam_new(const char *id,
 115                          const char *service,
 116                          Error **errp)
 117{
 118    return QAUTHZ_PAM(
 119        object_new_with_props(TYPE_QAUTHZ_PAM,
 120                              object_get_objects_root(),
 121                              id, errp,
 122                              "service", service,
 123                              NULL));
 124}
 125
 126
 127static const TypeInfo qauthz_pam_info = {
 128    .parent = TYPE_QAUTHZ,
 129    .name = TYPE_QAUTHZ_PAM,
 130    .instance_size = sizeof(QAuthZPAM),
 131    .instance_finalize = qauthz_pam_finalize,
 132    .class_size = sizeof(QAuthZPAMClass),
 133    .class_init = qauthz_pam_class_init,
 134    .interfaces = (InterfaceInfo[]) {
 135        { TYPE_USER_CREATABLE },
 136        { }
 137    }
 138};
 139
 140
 141static void
 142qauthz_pam_register_types(void)
 143{
 144    type_register_static(&qauthz_pam_info);
 145}
 146
 147
 148type_init(qauthz_pam_register_types);
 149