cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

pamacct.c (3937B)

      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 2.1 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 "trace.h"
     24#include "qemu/module.h"
     25#include "qom/object_interfaces.h"
     26
     27#include <security/pam_appl.h>
     28
     29
     30static bool qauthz_pam_is_allowed(QAuthZ *authz,
     31                                  const char *identity,
     32                                  Error **errp)
     33{
     34    QAuthZPAM *pauthz = QAUTHZ_PAM(authz);
     35    const struct pam_conv pam_conversation = { 0 };
     36    pam_handle_t *pamh = NULL;
     37    int ret;
     38
     39    trace_qauthz_pam_check(authz, identity, pauthz->service);
     40    ret = pam_start(pauthz->service,
     41                    identity,
     42                    &pam_conversation,
     43                    &pamh);
     44    if (ret != PAM_SUCCESS) {
     45        error_setg(errp, "Unable to start PAM transaction: %s",
     46                   pam_strerror(NULL, ret));
     47        return false;
     48    }
     49
     50    ret = pam_acct_mgmt(pamh, PAM_SILENT);
     51    pam_end(pamh, ret);
     52    if (ret != PAM_SUCCESS) {
     53        error_setg(errp, "Unable to authorize user '%s': %s",
     54                   identity, pam_strerror(pamh, ret));
     55        return false;
     56    }
     57
     58    return true;
     59}
     60
     61
     62static void
     63qauthz_pam_prop_set_service(Object *obj,
     64                            const char *service,
     65                            Error **errp G_GNUC_UNUSED)
     66{
     67    QAuthZPAM *pauthz = QAUTHZ_PAM(obj);
     68
     69    g_free(pauthz->service);
     70    pauthz->service = g_strdup(service);
     71}
     72
     73
     74static char *
     75qauthz_pam_prop_get_service(Object *obj,
     76                            Error **errp G_GNUC_UNUSED)
     77{
     78    QAuthZPAM *pauthz = QAUTHZ_PAM(obj);
     79
     80    return g_strdup(pauthz->service);
     81}
     82
     83
     84static void
     85qauthz_pam_complete(UserCreatable *uc, Error **errp)
     86{
     87    QAuthZPAM *pauthz = QAUTHZ_PAM(uc);
     88
     89    if (!pauthz->service) {
     90        error_setg(errp, "The 'service' property must be set");
     91        return;
     92    }
     93}
     94
     95
     96static void
     97qauthz_pam_finalize(Object *obj)
     98{
     99    QAuthZPAM *pauthz = QAUTHZ_PAM(obj);
    100
    101    g_free(pauthz->service);
    102}
    103
    104
    105static void
    106qauthz_pam_class_init(ObjectClass *oc, void *data)
    107{
    108    UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
    109    QAuthZClass *authz = QAUTHZ_CLASS(oc);
    110
    111    ucc->complete = qauthz_pam_complete;
    112    authz->is_allowed = qauthz_pam_is_allowed;
    113
    114    object_class_property_add_str(oc, "service",
    115                                  qauthz_pam_prop_get_service,
    116                                  qauthz_pam_prop_set_service);
    117}
    118
    119
    120QAuthZPAM *qauthz_pam_new(const char *id,
    121                          const char *service,
    122                          Error **errp)
    123{
    124    return QAUTHZ_PAM(
    125        object_new_with_props(TYPE_QAUTHZ_PAM,
    126                              object_get_objects_root(),
    127                              id, errp,
    128                              "service", service,
    129                              NULL));
    130}
    131
    132
    133static const TypeInfo qauthz_pam_info = {
    134    .parent = TYPE_QAUTHZ,
    135    .name = TYPE_QAUTHZ_PAM,
    136    .instance_size = sizeof(QAuthZPAM),
    137    .instance_finalize = qauthz_pam_finalize,
    138    .class_init = qauthz_pam_class_init,
    139    .interfaces = (InterfaceInfo[]) {
    140        { TYPE_USER_CREATABLE },
    141        { }
    142    }
    143};
    144
    145
    146static void
    147qauthz_pam_register_types(void)
    148{
    149    type_register_static(&qauthz_pam_info);
    150}
    151
    152
    153type_init(qauthz_pam_register_types);