Luke Huang | 403c044 | 2019-02-25 15:33:42 +0800 | [diff] [blame] | 1 | /** |
| 2 | * Copyright (c) 2019, The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
Ken Chen | 5471dca | 2019-04-15 15:25:35 +0800 | [diff] [blame] | 17 | #define LOG_TAG "resolv" |
Luke Huang | 403c044 | 2019-02-25 15:33:42 +0800 | [diff] [blame] | 18 | |
Luke Huang | 36796f3 | 2019-03-13 02:54:45 +0800 | [diff] [blame] | 19 | #include "DnsResolverService.h" |
| 20 | |
Luke Huang | 403c044 | 2019-02-25 15:33:42 +0800 | [diff] [blame] | 21 | #include <set> |
| 22 | #include <vector> |
| 23 | |
Luke Huang | f4c98f2 | 2019-06-14 01:57:00 +0800 | [diff] [blame] | 24 | #include <BinderUtil.h> |
Luke Huang | 403c044 | 2019-02-25 15:33:42 +0800 | [diff] [blame] | 25 | #include <android-base/stringprintf.h> |
| 26 | #include <android-base/strings.h> |
| 27 | #include <android/binder_manager.h> |
| 28 | #include <android/binder_process.h> |
Luke Huang | 598daad | 2019-05-02 18:10:15 +0800 | [diff] [blame] | 29 | #include <netdutils/DumpWriter.h> |
Luke Huang | 403c044 | 2019-02-25 15:33:42 +0800 | [diff] [blame] | 30 | #include <private/android_filesystem_config.h> // AID_SYSTEM |
| 31 | |
Luke Huang | 36796f3 | 2019-03-13 02:54:45 +0800 | [diff] [blame] | 32 | #include "DnsResolver.h" |
Luke Huang | 403c044 | 2019-02-25 15:33:42 +0800 | [diff] [blame] | 33 | #include "NetdPermissions.h" // PERM_* |
Hungming Chen | a32c8c1 | 2019-01-25 10:47:40 +0800 | [diff] [blame] | 34 | #include "ResolverEventReporter.h" |
Luke Huang | c6bbbe7 | 2019-03-28 21:38:28 +0800 | [diff] [blame] | 35 | #include "resolv_cache.h" |
Luke Huang | 403c044 | 2019-02-25 15:33:42 +0800 | [diff] [blame] | 36 | |
waynema | 3725518 | 2019-03-18 13:22:56 +0800 | [diff] [blame] | 37 | using aidl::android::net::ResolverParamsParcel; |
Luke Huang | 403c044 | 2019-02-25 15:33:42 +0800 | [diff] [blame] | 38 | using android::base::Join; |
| 39 | using android::base::StringPrintf; |
Luke Huang | 7b26b20 | 2019-03-28 14:09:24 +0800 | [diff] [blame] | 40 | using android::netdutils::DumpWriter; |
Luke Huang | 403c044 | 2019-02-25 15:33:42 +0800 | [diff] [blame] | 41 | |
| 42 | namespace android { |
| 43 | namespace net { |
| 44 | |
| 45 | namespace { |
| 46 | |
| 47 | #define ENFORCE_ANY_PERMISSION(...) \ |
| 48 | do { \ |
| 49 | ::ndk::ScopedAStatus status = checkAnyPermission({__VA_ARGS__}); \ |
| 50 | if (!status.isOk()) { \ |
| 51 | return status; \ |
| 52 | } \ |
| 53 | } while (0) |
| 54 | |
| 55 | #define ENFORCE_INTERNAL_PERMISSIONS() \ |
| 56 | ENFORCE_ANY_PERMISSION(PERM_CONNECTIVITY_INTERNAL, PERM_MAINLINE_NETWORK_STACK) |
| 57 | |
| 58 | #define ENFORCE_NETWORK_STACK_PERMISSIONS() \ |
| 59 | ENFORCE_ANY_PERMISSION(PERM_NETWORK_STACK, PERM_MAINLINE_NETWORK_STACK) |
| 60 | |
Hungming Chen | a32c8c1 | 2019-01-25 10:47:40 +0800 | [diff] [blame] | 61 | inline ::ndk::ScopedAStatus statusFromErrcode(int ret) { |
| 62 | if (ret) { |
| 63 | return ::ndk::ScopedAStatus( |
| 64 | AStatus_fromServiceSpecificErrorWithMessage(-ret, strerror(-ret))); |
| 65 | } |
| 66 | return ::ndk::ScopedAStatus(AStatus_newOk()); |
| 67 | } |
| 68 | |
Luke Huang | 403c044 | 2019-02-25 15:33:42 +0800 | [diff] [blame] | 69 | } // namespace |
| 70 | |
Luke Huang | 598daad | 2019-05-02 18:10:15 +0800 | [diff] [blame] | 71 | DnsResolverService::DnsResolverService() { |
| 72 | // register log callback to BnDnsResolver::logFunc |
| 73 | BnDnsResolver::logFunc = |
| 74 | std::bind(binderCallLogFn, std::placeholders::_1, |
| 75 | [](const std::string& msg) { gResNetdCallbacks.log(msg.c_str()); }); |
| 76 | } |
| 77 | |
Luke Huang | 36796f3 | 2019-03-13 02:54:45 +0800 | [diff] [blame] | 78 | binder_status_t DnsResolverService::start() { |
Luke Huang | 403c044 | 2019-02-25 15:33:42 +0800 | [diff] [blame] | 79 | // TODO: Add disableBackgroundScheduling(true) after libbinder_ndk support it. b/126506010 |
| 80 | // NetdNativeService does call disableBackgroundScheduling currently, so it is fine now. |
Luke Huang | 36796f3 | 2019-03-13 02:54:45 +0800 | [diff] [blame] | 81 | DnsResolverService* resolverService = new DnsResolverService(); |
Luke Huang | 403c044 | 2019-02-25 15:33:42 +0800 | [diff] [blame] | 82 | binder_status_t status = |
| 83 | AServiceManager_addService(resolverService->asBinder().get(), getServiceName()); |
| 84 | if (status != STATUS_OK) { |
| 85 | return status; |
| 86 | } |
| 87 | |
| 88 | ABinderProcess_startThreadPool(); |
| 89 | |
| 90 | // TODO: register log callback if binder NDK backend support it. b/126501406 |
| 91 | |
| 92 | return STATUS_OK; |
| 93 | } |
| 94 | |
Luke Huang | c6bbbe7 | 2019-03-28 21:38:28 +0800 | [diff] [blame] | 95 | binder_status_t DnsResolverService::dump(int fd, const char**, uint32_t) { |
| 96 | auto dump_permission = checkAnyPermission({PERM_DUMP}); |
| 97 | if (!dump_permission.isOk()) { |
| 98 | return STATUS_PERMISSION_DENIED; |
| 99 | } |
| 100 | |
| 101 | // This method does not grab any locks. If individual classes need locking |
| 102 | // their dump() methods MUST handle locking appropriately. |
| 103 | DumpWriter dw(fd); |
| 104 | for (auto netId : resolv_list_caches()) { |
| 105 | dw.println("NetId: %u", netId); |
| 106 | gDnsResolv->resolverCtrl.dump(dw, netId); |
| 107 | dw.blankline(); |
| 108 | } |
| 109 | |
Luke Huang | 7b26b20 | 2019-03-28 14:09:24 +0800 | [diff] [blame] | 110 | return STATUS_OK; |
| 111 | } |
| 112 | |
Luke Huang | 403c044 | 2019-02-25 15:33:42 +0800 | [diff] [blame] | 113 | ::ndk::ScopedAStatus DnsResolverService::isAlive(bool* alive) { |
| 114 | ENFORCE_INTERNAL_PERMISSIONS(); |
| 115 | |
| 116 | *alive = true; |
| 117 | |
| 118 | return ::ndk::ScopedAStatus(AStatus_newOk()); |
| 119 | } |
| 120 | |
Hungming Chen | a32c8c1 | 2019-01-25 10:47:40 +0800 | [diff] [blame] | 121 | ::ndk::ScopedAStatus DnsResolverService::registerEventListener( |
| 122 | const std::shared_ptr<aidl::android::net::metrics::INetdEventListener>& listener) { |
| 123 | ENFORCE_NETWORK_STACK_PERMISSIONS(); |
| 124 | |
| 125 | int res = ResolverEventReporter::getInstance().addListener(listener); |
| 126 | |
| 127 | return statusFromErrcode(res); |
| 128 | } |
| 129 | |
Luke Huang | 403c044 | 2019-02-25 15:33:42 +0800 | [diff] [blame] | 130 | ::ndk::ScopedAStatus DnsResolverService::checkAnyPermission( |
| 131 | const std::vector<const char*>& permissions) { |
| 132 | // TODO: Remove callback and move this to unnamed namespace after libbiner_ndk supports |
| 133 | // check_permission. |
Luke Huang | 36796f3 | 2019-03-13 02:54:45 +0800 | [diff] [blame] | 134 | if (!gResNetdCallbacks.check_calling_permission) { |
Luke Huang | 403c044 | 2019-02-25 15:33:42 +0800 | [diff] [blame] | 135 | return ::ndk::ScopedAStatus(AStatus_fromExceptionCodeWithMessage( |
| 136 | EX_NULL_POINTER, "check_calling_permission is null")); |
| 137 | } |
| 138 | pid_t pid = AIBinder_getCallingPid(); |
| 139 | uid_t uid = AIBinder_getCallingUid(); |
| 140 | |
| 141 | // If the caller is the system UID, don't check permissions. |
| 142 | // Otherwise, if the system server's binder thread pool is full, and all the threads are |
| 143 | // blocked on a thread that's waiting for us to complete, we deadlock. http://b/69389492 |
| 144 | // |
| 145 | // From a security perspective, there is currently no difference, because: |
| 146 | // 1. The only permissions we check in netd's binder interface are CONNECTIVITY_INTERNAL |
| 147 | // and NETWORK_STACK, which the system server always has (or MAINLINE_NETWORK_STACK, which |
| 148 | // is equivalent to having both CONNECTIVITY_INTERNAL and NETWORK_STACK). |
| 149 | // 2. AID_SYSTEM always has all permissions. See ActivityManager#checkComponentPermission. |
| 150 | if (uid == AID_SYSTEM) { |
| 151 | return ::ndk::ScopedAStatus(AStatus_newOk()); |
| 152 | } |
| 153 | |
| 154 | for (const char* permission : permissions) { |
Luke Huang | 36796f3 | 2019-03-13 02:54:45 +0800 | [diff] [blame] | 155 | if (gResNetdCallbacks.check_calling_permission(permission)) { |
Luke Huang | 403c044 | 2019-02-25 15:33:42 +0800 | [diff] [blame] | 156 | return ::ndk::ScopedAStatus(AStatus_newOk()); |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | auto err = StringPrintf("UID %d / PID %d does not have any of the following permissions: %s", |
| 161 | uid, pid, Join(permissions, ',').c_str()); |
| 162 | return ::ndk::ScopedAStatus(AStatus_fromExceptionCodeWithMessage(EX_SECURITY, err.c_str())); |
| 163 | } |
| 164 | |
Luke Huang | 7b26b20 | 2019-03-28 14:09:24 +0800 | [diff] [blame] | 165 | ::ndk::ScopedAStatus DnsResolverService::setResolverConfiguration( |
waynema | 3725518 | 2019-03-18 13:22:56 +0800 | [diff] [blame] | 166 | const ResolverParamsParcel& resolverParams) { |
Luke Huang | 7b26b20 | 2019-03-28 14:09:24 +0800 | [diff] [blame] | 167 | // Locking happens in PrivateDnsConfiguration and res_* functions. |
| 168 | ENFORCE_INTERNAL_PERMISSIONS(); |
Luke Huang | 598daad | 2019-05-02 18:10:15 +0800 | [diff] [blame] | 169 | // TODO: Remove this log after AIDL gen_log supporting more types, b/129732660 |
Luke Huang | c6bbbe7 | 2019-03-28 21:38:28 +0800 | [diff] [blame] | 170 | auto entry = |
| 171 | gDnsResolverLog.newEntry() |
| 172 | .prettyFunction(__PRETTY_FUNCTION__) |
waynema | 3725518 | 2019-03-18 13:22:56 +0800 | [diff] [blame] | 173 | .args(resolverParams.netId, resolverParams.servers, resolverParams.domains, |
| 174 | resolverParams.sampleValiditySeconds, resolverParams.successThreshold, |
| 175 | resolverParams.minSamples, resolverParams.maxSamples, |
waynema | 9a53023 | 2019-04-18 19:13:26 +0800 | [diff] [blame] | 176 | resolverParams.baseTimeoutMsec, resolverParams.retryCount, |
waynema | 0e73c2e | 2019-07-31 15:04:08 +0800 | [diff] [blame] | 177 | resolverParams.tlsName, resolverParams.tlsServers); |
Luke Huang | 7b26b20 | 2019-03-28 14:09:24 +0800 | [diff] [blame] | 178 | |
waynema | 0e73c2e | 2019-07-31 15:04:08 +0800 | [diff] [blame] | 179 | int res = gDnsResolv->resolverCtrl.setResolverConfiguration(resolverParams); |
Luke Huang | 598daad | 2019-05-02 18:10:15 +0800 | [diff] [blame] | 180 | gResNetdCallbacks.log(entry.returns(res).withAutomaticDuration().toString().c_str()); |
| 181 | |
| 182 | return statusFromErrcode(res); |
Luke Huang | 7b26b20 | 2019-03-28 14:09:24 +0800 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | ::ndk::ScopedAStatus DnsResolverService::getResolverInfo( |
| 186 | int32_t netId, std::vector<std::string>* servers, std::vector<std::string>* domains, |
| 187 | std::vector<std::string>* tlsServers, std::vector<int32_t>* params, |
| 188 | std::vector<int32_t>* stats, std::vector<int32_t>* wait_for_pending_req_timeout_count) { |
| 189 | // Locking happens in PrivateDnsConfiguration and res_* functions. |
| 190 | ENFORCE_NETWORK_STACK_PERMISSIONS(); |
| 191 | |
Luke Huang | 598daad | 2019-05-02 18:10:15 +0800 | [diff] [blame] | 192 | int res = gDnsResolv->resolverCtrl.getResolverInfo(netId, servers, domains, tlsServers, params, |
Luke Huang | 7b26b20 | 2019-03-28 14:09:24 +0800 | [diff] [blame] | 193 | stats, wait_for_pending_req_timeout_count); |
Luke Huang | c6bbbe7 | 2019-03-28 21:38:28 +0800 | [diff] [blame] | 194 | |
Luke Huang | 598daad | 2019-05-02 18:10:15 +0800 | [diff] [blame] | 195 | return statusFromErrcode(res); |
Luke Huang | 7b26b20 | 2019-03-28 14:09:24 +0800 | [diff] [blame] | 196 | } |
| 197 | |
| 198 | ::ndk::ScopedAStatus DnsResolverService::startPrefix64Discovery(int32_t netId) { |
| 199 | // Locking happens in Dns64Configuration. |
| 200 | ENFORCE_NETWORK_STACK_PERMISSIONS(); |
Luke Huang | c6bbbe7 | 2019-03-28 21:38:28 +0800 | [diff] [blame] | 201 | |
Luke Huang | 7b26b20 | 2019-03-28 14:09:24 +0800 | [diff] [blame] | 202 | gDnsResolv->resolverCtrl.startPrefix64Discovery(netId); |
| 203 | |
| 204 | return ::ndk::ScopedAStatus(AStatus_newOk()); |
| 205 | } |
| 206 | |
| 207 | ::ndk::ScopedAStatus DnsResolverService::stopPrefix64Discovery(int32_t netId) { |
| 208 | // Locking happens in Dns64Configuration. |
| 209 | ENFORCE_NETWORK_STACK_PERMISSIONS(); |
Luke Huang | c6bbbe7 | 2019-03-28 21:38:28 +0800 | [diff] [blame] | 210 | |
Luke Huang | 7b26b20 | 2019-03-28 14:09:24 +0800 | [diff] [blame] | 211 | gDnsResolv->resolverCtrl.stopPrefix64Discovery(netId); |
| 212 | |
| 213 | return ::ndk::ScopedAStatus(AStatus_newOk()); |
| 214 | } |
| 215 | |
| 216 | ::ndk::ScopedAStatus DnsResolverService::getPrefix64(int netId, std::string* stringPrefix) { |
| 217 | ENFORCE_NETWORK_STACK_PERMISSIONS(); |
Luke Huang | c6bbbe7 | 2019-03-28 21:38:28 +0800 | [diff] [blame] | 218 | |
Luke Huang | 7b26b20 | 2019-03-28 14:09:24 +0800 | [diff] [blame] | 219 | netdutils::IPPrefix prefix{}; |
Luke Huang | 598daad | 2019-05-02 18:10:15 +0800 | [diff] [blame] | 220 | int res = gDnsResolv->resolverCtrl.getPrefix64(netId, &prefix); |
Luke Huang | 7b26b20 | 2019-03-28 14:09:24 +0800 | [diff] [blame] | 221 | *stringPrefix = prefix.toString(); |
| 222 | |
Luke Huang | 598daad | 2019-05-02 18:10:15 +0800 | [diff] [blame] | 223 | return statusFromErrcode(res); |
Luke Huang | 7b26b20 | 2019-03-28 14:09:24 +0800 | [diff] [blame] | 224 | } |
| 225 | |
Ken Chen | d99022c | 2019-02-20 21:34:14 +0800 | [diff] [blame] | 226 | ::ndk::ScopedAStatus DnsResolverService::setLogSeverity(int32_t logSeverity) { |
| 227 | ENFORCE_NETWORK_STACK_PERMISSIONS(); |
Luke Huang | 598daad | 2019-05-02 18:10:15 +0800 | [diff] [blame] | 228 | |
Ken Chen | d99022c | 2019-02-20 21:34:14 +0800 | [diff] [blame] | 229 | int res = gDnsResolv->setLogSeverity(logSeverity); |
| 230 | |
Ken Chen | d99022c | 2019-02-20 21:34:14 +0800 | [diff] [blame] | 231 | return statusFromErrcode(res); |
| 232 | } |
| 233 | |
Luke Huang | 9b80e6c | 2019-04-09 17:54:09 +0800 | [diff] [blame] | 234 | ::ndk::ScopedAStatus DnsResolverService::destroyNetworkCache(int netId) { |
| 235 | // Locking happens in res_cache.cpp functions. |
Luke Huang | 5bd827c | 2019-03-14 16:10:04 +0800 | [diff] [blame] | 236 | ENFORCE_NETWORK_STACK_PERMISSIONS(); |
| 237 | |
Luke Huang | 9b80e6c | 2019-04-09 17:54:09 +0800 | [diff] [blame] | 238 | gDnsResolv->resolverCtrl.destroyNetworkCache(netId); |
Luke Huang | c6bbbe7 | 2019-03-28 21:38:28 +0800 | [diff] [blame] | 239 | |
Luke Huang | 5bd827c | 2019-03-14 16:10:04 +0800 | [diff] [blame] | 240 | return ::ndk::ScopedAStatus(AStatus_newOk()); |
| 241 | } |
| 242 | |
Luke Huang | 9b80e6c | 2019-04-09 17:54:09 +0800 | [diff] [blame] | 243 | ::ndk::ScopedAStatus DnsResolverService::createNetworkCache(int netId) { |
| 244 | // Locking happens in res_cache.cpp functions. |
| 245 | ENFORCE_NETWORK_STACK_PERMISSIONS(); |
Luke Huang | 9b80e6c | 2019-04-09 17:54:09 +0800 | [diff] [blame] | 246 | |
| 247 | int res = gDnsResolv->resolverCtrl.createNetworkCache(netId); |
| 248 | |
Luke Huang | 9b80e6c | 2019-04-09 17:54:09 +0800 | [diff] [blame] | 249 | return statusFromErrcode(res); |
| 250 | } |
| 251 | |
Luke Huang | 403c044 | 2019-02-25 15:33:42 +0800 | [diff] [blame] | 252 | } // namespace net |
| 253 | } // namespace android |