Alexey Krasikov | 54e7aac | 2020-05-25 14:19:12 +0300 | [diff] [blame] | 1 | /* |
| 2 | * QEMU crypto secret support |
| 3 | * |
| 4 | * Copyright 2020 Yandex N.V. |
| 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 <asm/unistd.h> |
| 23 | #include <linux/keyctl.h> |
| 24 | #include "qapi/error.h" |
| 25 | #include "qom/object_interfaces.h" |
| 26 | #include "trace.h" |
| 27 | #include "crypto/secret_keyring.h" |
| 28 | |
| 29 | |
| 30 | static inline |
| 31 | long keyctl_read(int32_t key, uint8_t *buffer, size_t buflen) |
| 32 | { |
| 33 | return syscall(__NR_keyctl, KEYCTL_READ, key, buffer, buflen, 0); |
| 34 | } |
| 35 | |
| 36 | |
| 37 | static void |
| 38 | qcrypto_secret_keyring_load_data(QCryptoSecretCommon *sec_common, |
| 39 | uint8_t **output, |
| 40 | size_t *outputlen, |
| 41 | Error **errp) |
| 42 | { |
| 43 | QCryptoSecretKeyring *secret = QCRYPTO_SECRET_KEYRING(sec_common); |
| 44 | uint8_t *buffer = NULL; |
| 45 | long retcode; |
| 46 | |
| 47 | *output = NULL; |
| 48 | *outputlen = 0; |
| 49 | |
| 50 | if (!secret->serial) { |
| 51 | error_setg(errp, "'serial' parameter must be provided"); |
| 52 | return; |
| 53 | } |
| 54 | |
| 55 | retcode = keyctl_read(secret->serial, NULL, 0); |
| 56 | if (retcode <= 0) { |
| 57 | goto keyctl_error; |
| 58 | } |
| 59 | |
| 60 | buffer = g_new0(uint8_t, retcode); |
| 61 | |
| 62 | retcode = keyctl_read(secret->serial, buffer, retcode); |
| 63 | if (retcode < 0) { |
| 64 | g_free(buffer); |
| 65 | goto keyctl_error; |
| 66 | } |
| 67 | |
| 68 | *outputlen = retcode; |
| 69 | *output = buffer; |
| 70 | return; |
| 71 | |
| 72 | keyctl_error: |
| 73 | error_setg_errno(errp, errno, |
| 74 | "Unable to read serial key %08x", |
| 75 | secret->serial); |
| 76 | } |
| 77 | |
| 78 | |
| 79 | static void |
| 80 | qcrypto_secret_prop_set_key(Object *obj, Visitor *v, |
| 81 | const char *name, void *opaque, |
| 82 | Error **errp) |
| 83 | { |
| 84 | QCryptoSecretKeyring *secret = QCRYPTO_SECRET_KEYRING(obj); |
| 85 | int32_t value; |
| 86 | visit_type_int32(v, name, &value, errp); |
| 87 | if (!value) { |
| 88 | error_setg(errp, "'serial' should not be equal to 0"); |
| 89 | } |
| 90 | secret->serial = value; |
| 91 | } |
| 92 | |
| 93 | |
| 94 | static void |
| 95 | qcrypto_secret_prop_get_key(Object *obj, Visitor *v, |
| 96 | const char *name, void *opaque, |
| 97 | Error **errp) |
| 98 | { |
| 99 | QCryptoSecretKeyring *secret = QCRYPTO_SECRET_KEYRING(obj); |
| 100 | int32_t value = secret->serial; |
| 101 | visit_type_int32(v, name, &value, errp); |
| 102 | } |
| 103 | |
| 104 | |
| 105 | static void |
Alexey Krasikov | 54e7aac | 2020-05-25 14:19:12 +0300 | [diff] [blame] | 106 | qcrypto_secret_keyring_class_init(ObjectClass *oc, void *data) |
| 107 | { |
| 108 | QCryptoSecretCommonClass *sic = QCRYPTO_SECRET_COMMON_CLASS(oc); |
| 109 | sic->load_data = qcrypto_secret_keyring_load_data; |
| 110 | |
Alexey Krasikov | 54e7aac | 2020-05-25 14:19:12 +0300 | [diff] [blame] | 111 | object_class_property_add(oc, "serial", "int32_t", |
| 112 | qcrypto_secret_prop_get_key, |
| 113 | qcrypto_secret_prop_set_key, |
| 114 | NULL, NULL); |
| 115 | } |
| 116 | |
| 117 | |
| 118 | static const TypeInfo qcrypto_secret_info = { |
| 119 | .parent = TYPE_QCRYPTO_SECRET_COMMON, |
| 120 | .name = TYPE_QCRYPTO_SECRET_KEYRING, |
| 121 | .instance_size = sizeof(QCryptoSecretKeyring), |
Alexey Krasikov | 54e7aac | 2020-05-25 14:19:12 +0300 | [diff] [blame] | 122 | .class_init = qcrypto_secret_keyring_class_init, |
Alexey Krasikov | 54e7aac | 2020-05-25 14:19:12 +0300 | [diff] [blame] | 123 | }; |
| 124 | |
| 125 | |
| 126 | static void |
| 127 | qcrypto_secret_register_types(void) |
| 128 | { |
| 129 | type_register_static(&qcrypto_secret_info); |
| 130 | } |
| 131 | |
| 132 | |
| 133 | type_init(qcrypto_secret_register_types); |