crypto/secret.c

   1 /*
   2  * QEMU crypto secret support
   3  *
   4  * Copyright (c) 2015 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 "crypto/secret.h"
  23 #include "qapi/error.h"
  24 #include "qom/object_interfaces.h"
  25 #include "qemu/module.h"
  26 #include "trace.h"
  27
  28
  29 static void
  30 qcrypto_secret_load_data(QCryptoSecretCommon *sec_common,
  31                          uint8_t **output,
  32                          size_t *outputlen,
  33                          Error **errp)
  34 {
  35     char *data = NULL;
  36     size_t length = 0;
  37     GError *gerr = NULL;
  38
  39     QCryptoSecret *secret = QCRYPTO_SECRET(sec_common);
  40
  41     *output = NULL;
  42     *outputlen = 0;
  43
  44     if (secret->file) {
  45         if (secret->data) {
  46             error_setg(errp,
  47                        "'file' and 'data' are mutually exclusive");
  48             return;
  49         }
  50         if (!g_file_get_contents(secret->file, &data, &length, &gerr)) {
  51             error_setg(errp,
  52                        "Unable to read %s: %s",
  53                        secret->file, gerr->message);
  54             g_error_free(gerr);
  55             return;
  56         }
  57         *output = (uint8_t *)data;
  58         *outputlen = length;
  59     } else if (secret->data) {
  60         *outputlen = strlen(secret->data);
  61         *output = (uint8_t *)g_strdup(secret->data);
  62     } else {
  63         error_setg(errp, "Either 'file' or 'data' must be provided");
  64     }
  65 }
  66
  67
  68 static void
  69 qcrypto_secret_prop_set_data(Object *obj,
  70                              const char *value,
  71                              Error **errp)
  72 {
  73     QCryptoSecret *secret = QCRYPTO_SECRET(obj);
  74
  75     g_free(secret->data);
  76     secret->data = g_strdup(value);
  77 }
  78
  79
  80 static char *
  81 qcrypto_secret_prop_get_data(Object *obj,
  82                              Error **errp)
  83 {
  84     QCryptoSecret *secret = QCRYPTO_SECRET(obj);
  85     return g_strdup(secret->data);
  86 }
  87
  88
  89 static void
  90 qcrypto_secret_prop_set_file(Object *obj,
  91                              const char *value,
  92                              Error **errp)
  93 {
  94     QCryptoSecret *secret = QCRYPTO_SECRET(obj);
  95
  96     g_free(secret->file);
  97     secret->file = g_strdup(value);
  98 }
  99
 100
 101 static char *
 102 qcrypto_secret_prop_get_file(Object *obj,
 103                              Error **errp)
 104 {
 105     QCryptoSecret *secret = QCRYPTO_SECRET(obj);
 106     return g_strdup(secret->file);
 107 }
 108
 109
 110 static void
 111 qcrypto_secret_complete(UserCreatable *uc, Error **errp)
 112 {
 113     object_property_set_bool(OBJECT(uc), "loaded", true, errp);
 114 }
 115
 116
 117 static void
 118 qcrypto_secret_finalize(Object *obj)
 119 {
 120     QCryptoSecret *secret = QCRYPTO_SECRET(obj);
 121
 122     g_free(secret->file);
 123     g_free(secret->data);
 124 }
 125
 126 static void
 127 qcrypto_secret_class_init(ObjectClass *oc, void *data)
 128 {
 129     QCryptoSecretCommonClass *sic = QCRYPTO_SECRET_COMMON_CLASS(oc);
 130     sic->load_data = qcrypto_secret_load_data;
 131
 132     UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
 133     ucc->complete = qcrypto_secret_complete;
 134
 135     object_class_property_add_str(oc, "data",
 136                                   qcrypto_secret_prop_get_data,
 137                                   qcrypto_secret_prop_set_data);
 138     object_class_property_add_str(oc, "file",
 139                                   qcrypto_secret_prop_get_file,
 140                                   qcrypto_secret_prop_set_file);
 141 }
 142
 143
 144 static const TypeInfo qcrypto_secret_info = {
 145     .parent = TYPE_QCRYPTO_SECRET_COMMON,
 146     .name = TYPE_QCRYPTO_SECRET,
 147     .instance_size = sizeof(QCryptoSecret),
 148     .instance_finalize = qcrypto_secret_finalize,
 149     .class_size = sizeof(QCryptoSecretClass),
 150     .class_init = qcrypto_secret_class_init,
 151     .interfaces = (InterfaceInfo[]) {
 152         { TYPE_USER_CREATABLE },
 153         { }
 154     }
 155 };
 156
 157
 158 static void
 159 qcrypto_secret_register_types(void)
 160 {
 161     type_register_static(&qcrypto_secret_info);
 162 }
 163
 164
 165 type_init(qcrypto_secret_register_types);