Security/libsecurity_utilities/lib/mach++.cpp

   1 /*
   2  * Copyright (c) 2000-2004,2011-2012,2014 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24
  25 //
  26 // mach++ - C++ bindings for useful Mach primitives
  27 //
  28 #include <security_utilities/mach++.h>
  29 #include <mach/mach_error.h>
  30 #include <security_utilities/debugging.h>
  31 #include <Security/cssmapple.h>         // error codes
  32 #include <servers/bootstrap_defs.h>     // debug
  33 #include <bootstrap_priv.h>
  34
  35 namespace Security {
  36 namespace MachPlusPlus {
  37
  38
  39 //
  40 // Mach subsystem exceptions, a subclass of CssmCommonError
  41 //
  42 Error::Error(kern_return_t err) : error(err)
  43 {
  44         SECURITY_EXCEPTION_THROW_MACH(this, err);
  45 }
  46
  47 Error::~Error() throw()
  48 { }
  49
  50
  51 OSStatus Error::osStatus() const
  52 {
  53         switch (error) {
  54         case MIG_BAD_ARGUMENTS:
  55         case MIG_TYPE_ERROR:
  56         case MIG_REMOTE_ERROR:
  57                 return CSSMERR_CSSM_SERVICE_NOT_AVAILABLE;              // IPC mismatch of some sort
  58         default:
  59                 return -1;              //@@@ some "internal error" code, perhaps?
  60         }
  61 }
  62
  63 int Error::unixError() const
  64 {
  65         switch (error) {
  66         case MIG_BAD_ARGUMENTS:
  67         case MIG_TYPE_ERROR:
  68         case MIG_REMOTE_ERROR:
  69                 return ERPCMISMATCH;            // IPC mismatch of some sort
  70         default:
  71                 return -1;              //@@@ some "internal error" code, perhaps?
  72         }
  73 }
  74
  75 void Error::check(kern_return_t status)
  76 {
  77         if (status != KERN_SUCCESS)
  78                 Error::throwMe(status);
  79 }
  80
  81 void Error::throwMe(kern_return_t err)
  82 {
  83         throw Error(err);
  84 }
  85
  86
  87 //
  88 // Memory management
  89 //
  90 void *allocate(size_t size)
  91 {
  92         vm_address_t address;
  93         check(vm_allocate(mach_task_self(), &address, size, true));
  94         return reinterpret_cast<void *>(address);
  95 }
  96
  97 void deallocate(vm_address_t address, size_t size)
  98 {
  99         check(vm_deallocate(mach_task_self(), address, size));
 100 }
 101
 102
 103 //
 104 // Port functions
 105 //
 106 mach_port_urefs_t Port::getRefs(mach_port_right_t right)
 107 {
 108         mach_port_urefs_t count;
 109         check(::mach_port_get_refs(self(), mPort, right, &count));
 110         return count;
 111 }
 112
 113 mach_port_t Port::requestNotify(mach_port_t notify, mach_msg_id_t type, mach_port_mscount_t sync)
 114 {
 115     mach_port_t previous;
 116     check(mach_port_request_notification(self(), mPort, type, sync, notify,
 117         MACH_MSG_TYPE_MAKE_SEND_ONCE, &previous));
 118
 119 #if !defined(NDEBUG)
 120         const char *typeName;
 121         switch (type) {
 122         case MACH_NOTIFY_PORT_DELETED:  typeName = "port deleted"; break;
 123         case MACH_NOTIFY_PORT_DESTROYED:typeName = "port destroyed"; break;
 124         case MACH_NOTIFY_NO_SENDERS:    typeName = "no senders"; break;
 125         case MACH_NOTIFY_SEND_ONCE:             typeName = "send once"; break;
 126         case MACH_NOTIFY_DEAD_NAME:             typeName = "dead name"; break;
 127         default:                                                typeName = "???"; break;
 128         }
 129         if (notify == MACH_PORT_NULL)
 130                 secdebug("port", "%d cancel notify %s", port(), typeName);
 131         else
 132                 secdebug("port", "%d request notify %s to %d (sync %d)", port(), typeName, notify, sync);
 133 #endif //!NDEBUG
 134
 135     return previous;
 136 }
 137
 138 mach_port_t Port::cancelNotify(mach_msg_id_t type)
 139 {
 140     // Mach won't let us unset the DPN port if we are already dead
 141     // (EVEN if the DPN has already been sent!) So just ignore that case...
 142     if (isDead())
 143         return MACH_PORT_NULL;
 144         return requestNotify(MACH_PORT_NULL, type);
 145 }
 146
 147 mach_port_msgcount_t Port::qlimit() const
 148 {
 149         mach_port_limits_t limits;
 150         mach_msg_type_number_t infoCount = 1;
 151         check(::mach_port_get_attributes(self(), mPort, MACH_PORT_LIMITS_INFO,
 152                 mach_port_info_t(&limits), &infoCount));
 153         assert(infoCount == 1);
 154         return limits.mpl_qlimit;
 155 }
 156
 157 void Port::qlimit(mach_port_msgcount_t limit)
 158 {
 159         mach_port_limits_t limits;
 160         limits.mpl_qlimit = limit;
 161         check(::mach_port_set_attributes(self(), mPort, MACH_PORT_LIMITS_INFO,
 162                 mach_port_info_t(&limits), MACH_PORT_LIMITS_INFO_COUNT));
 163 }
 164
 165
 166 //
 167 // PortSet features
 168 //
 169 set<Port> PortSet::members() const
 170 {
 171         mach_port_array_t members;
 172         mach_msg_type_number_t count;
 173         check(::mach_port_get_set_status(self(), mPort, &members, &count));
 174         try {
 175                 set<Port> result;
 176                 copy(members, members+count, inserter(result, result.begin()));
 177                 vm_deallocate(self(), vm_address_t(members), count * sizeof(members[0]));
 178                 return result;
 179         } catch (...) {
 180                 vm_deallocate(self(), vm_address_t(members), count * sizeof(members[0]));
 181                 throw;
 182         }
 183 }
 184
 185
 186 bool PortSet::contains(Port member) const
 187 {
 188         set<Port> memberSet = members();
 189         return memberSet.find(member) != memberSet.end();
 190 }
 191
 192
 193 //
 194 // Task port features
 195 //
 196 TaskPort::TaskPort(pid_t pid)
 197 {
 198         check(::task_for_pid(self(), pid, &mPort));
 199 }
 200
 201 pid_t TaskPort::pid() const
 202 {
 203     pid_t pid;
 204     check(::pid_for_task(mPort, &pid));
 205     return pid;
 206 }
 207
 208
 209 //
 210 // Bootstrap port management
 211 //
 212 mach_port_t Bootstrap::checkIn(const char *name) const
 213 {
 214         mach_port_t port;
 215         check(::bootstrap_check_in(mPort, makeName(name), &port));
 216         return port;
 217 }
 218
 219 mach_port_t Bootstrap::checkInOptional(const char *name) const
 220 {
 221         mach_port_t port;
 222         switch (kern_return_t err = ::bootstrap_check_in(mPort, makeName(name), &port)) {
 223         case BOOTSTRAP_SERVICE_ACTIVE:
 224     case BOOTSTRAP_UNKNOWN_SERVICE:
 225         case BOOTSTRAP_NOT_PRIVILEGED:
 226         return MACH_PORT_NULL;
 227         default:
 228                 check(err);
 229         }
 230         return port;
 231 }
 232
 233 void Bootstrap::registerAs(mach_port_t port, const char *name) const
 234 {
 235         secdebug("bootstrap", "creating service port %d in %d:%s", port, this->port(), name);
 236         check(::bootstrap_register(mPort, makeName(name), port));
 237 }
 238
 239 mach_port_t Bootstrap::lookup(const char *name) const
 240 {
 241         mach_port_t port;
 242         check(::bootstrap_look_up(mPort, makeName(name), &port));
 243         return port;
 244 }
 245
 246 mach_port_t Bootstrap::lookup2(const char *name) const
 247 {
 248         mach_port_t port;
 249         check(::bootstrap_look_up2(mPort, makeName(name), &port, 0, BOOTSTRAP_PRIVILEGED_SERVER));
 250         return port;
 251 }
 252
 253 mach_port_t Bootstrap::lookupOptional(const char *name) const
 254 {
 255         mach_port_t port;
 256         kern_return_t err = ::bootstrap_look_up(mPort, makeName(name), &port);
 257     if (err == BOOTSTRAP_UNKNOWN_SERVICE)
 258         return 0;
 259     check(err);
 260         return port;
 261 }
 262
 263
 264 Bootstrap Bootstrap::subset(Port requestor)
 265 {
 266     mach_port_t sub;
 267     check(::bootstrap_subset(mPort, requestor, &sub));
 268     return sub;
 269 }
 270
 271
 272 //
 273 // ReceivePorts
 274 //
 275 ReceivePort::ReceivePort(const char *name, const Bootstrap &bootstrap, bool tryCheckin /* = true */)
 276 {
 277         if (tryCheckin)
 278                 mPort = bootstrap.checkInOptional(name);
 279         if (!mPort) {
 280                 allocate();
 281                 // Bootstrap registration requires a send right to (copy) send.
 282                 // Make a temporary one, send it, then take it away again, to avoid
 283                 // messing up the caller's send right accounting.
 284                 insertRight(MACH_MSG_TYPE_MAKE_SEND);
 285                 bootstrap.registerAs(mPort, name);
 286                 modRefs(MACH_PORT_RIGHT_SEND, -1);
 287         }
 288 }
 289
 290
 291 //
 292 // Stack-based bootstrap switcher
 293 //
 294 ModuleNexus<Mutex> StBootstrap::critical;
 295
 296 StBootstrap::StBootstrap(const Bootstrap &newBoot, const TaskPort &task)
 297     : mTask(task), locker(critical())
 298 {
 299     mOldBoot = Bootstrap();
 300     mTask.bootstrap(newBoot);
 301     secdebug("StBoot", "bootstrap for %d switched to %d", mTask.port(), newBoot.port());
 302 }
 303
 304 StBootstrap::~StBootstrap()
 305 {
 306     mTask.bootstrap(mOldBoot);
 307     secdebug("StBoot", "bootstrap for %d returned to %d", mTask.port(), mOldBoot.port());
 308 }
 309
 310
 311 //
 312 // Mach message buffers
 313 //
 314 Message::Message(void *buffer, mach_msg_size_t size)
 315         : mBuffer(NULL), mRelease(false)
 316 {
 317         setBuffer(buffer, size);
 318 }
 319
 320 Message::Message(mach_msg_size_t size)
 321         : mBuffer(NULL), mRelease(false)
 322 {
 323         setBuffer(size);
 324 }
 325
 326 Message::Message()
 327         : mBuffer(NULL), mRelease(false)
 328 { }
 329
 330
 331 Message::~Message()
 332 {
 333         release();
 334 }
 335
 336
 337 void Message::setBuffer(void *buffer, mach_msg_size_t size)
 338 {
 339         release();
 340         mBuffer = reinterpret_cast<mig_reply_error_t *>(buffer);
 341         mSize = size;
 342         mRelease = false;
 343 }
 344
 345 void Message::setBuffer(mach_msg_size_t size)
 346 {
 347         assert(size >= sizeof(mach_msg_header_t));
 348         release();
 349         mSize = size + MAX_TRAILER_SIZE;
 350         mBuffer = reinterpret_cast<mig_reply_error_t *>(new char[mSize]);
 351         mRelease = true;
 352 }
 353
 354
 355 void Message::release()
 356 {
 357         if (mRelease)
 358                 delete[] reinterpret_cast<char *>(mBuffer);
 359 }
 360
 361
 362 bool Message::check(kern_return_t status)
 363 {
 364     switch (status) {
 365     case KERN_SUCCESS:
 366         return true;
 367     case MACH_RCV_TIMED_OUT:
 368     case MACH_SEND_TIMED_OUT:
 369         return false;
 370     default:
 371         Error::throwMe(status);
 372     }
 373 }
 374
 375
 376 bool Message::send(mach_msg_option_t options,
 377     mach_msg_timeout_t timeout,
 378     mach_port_name_t notify)
 379 {
 380     return check(mach_msg_overwrite(*this,
 381         options | MACH_SEND_MSG,
 382         length(),
 383         0, MACH_PORT_NULL,
 384         timeout, notify,
 385         NULL, 0));
 386 }
 387
 388 bool Message::receive(mach_port_t receivePort,
 389     mach_msg_option_t options,
 390     mach_msg_timeout_t timeout,
 391     mach_port_name_t notify)
 392 {
 393     return check(mach_msg_overwrite(*this,
 394         options | MACH_RCV_MSG,
 395         length(),
 396         mSize, receivePort,
 397         timeout, notify,
 398         NULL, 0));
 399 }
 400
 401 bool Message::sendReceive(mach_port_t receivePort,
 402     mach_msg_option_t options,
 403     mach_msg_timeout_t timeout,
 404     mach_port_name_t notify)
 405 {
 406     return check(mach_msg_overwrite(*this,
 407         options | MACH_SEND_MSG | MACH_RCV_MSG,
 408         length(),
 409         mSize, receivePort,
 410         timeout, notify,
 411         NULL, 0));
 412 }
 413
 414
 415 //
 416 // Debug dumping of ports etc.
 417 //
 418 #if defined(DEBUGDUMP)
 419
 420 void Port::dump(const char *descr)
 421 {
 422     if (mPort == MACH_PORT_NULL) {
 423         Debug::dump("[%s==NULL]\n", descr ? descr : "port");
 424     } else {
 425         Debug::dump("[%s(%d)", descr ? descr : "port", mPort);
 426         mach_port_type_t type;
 427         if (kern_return_t err = mach_port_type(self(), mPort, &type)) {
 428             Debug::dump(" !%s", mach_error_string(err));
 429         } else {
 430             if (type & MACH_PORT_TYPE_SEND)
 431                 Debug::dump(" send(%d)", getRefs(MACH_PORT_RIGHT_SEND));
 432             if (type & MACH_PORT_TYPE_RECEIVE)
 433                 Debug::dump(" rcv");
 434             if (type & MACH_PORT_TYPE_SEND_ONCE)
 435                 Debug::dump(" once(%d)", getRefs(MACH_PORT_RIGHT_SEND));
 436             if (type & MACH_PORT_TYPE_PORT_SET)
 437                 Debug::dump(" set");
 438             if (type & MACH_PORT_TYPE_DEAD_NAME)
 439                 Debug::dump(" dead(%d)", getRefs(MACH_PORT_RIGHT_SEND));
 440             if (type & MACH_PORT_TYPE_DNREQUEST)
 441                 Debug::dump(" dnreq");
 442             // handle unknown/unexpected type flags
 443             if (type & ~(MACH_PORT_TYPE_SEND|MACH_PORT_TYPE_RECEIVE|MACH_PORT_TYPE_SEND_ONCE|
 444                     MACH_PORT_TYPE_PORT_SET|MACH_PORT_TYPE_DEAD_NAME|MACH_PORT_TYPE_DNREQUEST))
 445                 Debug::dump(" type(0x%x)", type);
 446         }
 447         Debug::dump("]\n");
 448     }
 449 }
 450
 451
 452 #endif //DEBUGDUMP
 453
 454
 455 } // end namespace MachPlusPlus
 456 } // end namespace Security