securityd/src/main.cpp

   1 /*
   2  * Copyright (c) 2000-2009,2014 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 // securityd - Apple security services daemon.
  27 //
  28 #include <securityd_client/ucsp.h>
  29
  30 #include "server.h"
  31 #include "session.h"
  32 #include "notifications.h"
  33 #include "pcscmonitor.h"
  34 #include "auditevents.h"
  35 #include "self.h"
  36 #include "util.h"
  37
  38 #include <security_utilities/daemon.h>
  39 #include <security_utilities/machserver.h>
  40 #include <security_utilities/logging.h>
  41
  42 #include <Security/SecKeychainPriv.h>
  43
  44 #include <unistd.h>
  45 #include <sys/types.h>
  46 #include <signal.h>
  47 #include <syslog.h>
  48
  49 // ACL subject types (their makers are instantiated here)
  50 #include <security_cdsa_utilities/acl_any.h>
  51 #include <security_cdsa_utilities/acl_password.h>
  52 #include <security_cdsa_utilities/acl_prompted.h>
  53 #include <security_cdsa_utilities/acl_protectedpw.h>
  54 #include <security_cdsa_utilities/acl_threshold.h>
  55 #include <security_cdsa_utilities/acl_codesigning.h>
  56 #include <security_cdsa_utilities/acl_process.h>
  57 #include <security_cdsa_utilities/acl_comment.h>
  58 #include <security_cdsa_utilities/acl_preauth.h>
  59 #include "acl_keychain.h"
  60 #include "acl_partition.h"
  61
  62 #include <sandbox.h>
  63
  64 //
  65 // Local functions of the main program driver
  66 //
  67 static void usage(const char *me) __attribute__((noreturn));
  68 static void handleSignals(int sig);
  69 static PCSCMonitor::ServiceLevel scOptions(const char *optionString);
  70 static bool legacyTokensEnabled(void);
  71
  72 static Port gMainServerPort;
  73 PCSCMonitor *gPCSC;
  74
  75
  76 //
  77 // Main driver
  78 //
  79 int main(int argc, char *argv[])
  80 {
  81         DisableLocalization();
  82
  83         // clear the umask - we know what we're doing
  84         secnotice("SecServer", "starting umask was 0%o", ::umask(0));
  85         ::umask(0);
  86
  87         // tell the keychain (client) layer to turn off the server interface
  88         SecKeychainSetServerMode();
  89
  90     const char *params[] = {"LEGACY_TOKENS_ENABLED", legacyTokensEnabled() ? "YES" : "NO", NULL};
  91     char* errorbuf = NULL;
  92     if (sandbox_init_with_parameters("com.apple.securityd", SANDBOX_NAMED, params, &errorbuf)) {
  93         seccritical("SecServer: unable to enter sandbox: %{public}s", errorbuf);
  94         if (errorbuf) {
  95             sandbox_free_error(errorbuf);
  96         }
  97         exit(1);
  98     } else {
  99         secnotice("SecServer", "entered sandbox");
 100     }
 101
 102         // program arguments (preset to defaults)
 103         bool debugMode = false;
 104         const char *bootstrapName = NULL;
 105         const char* messagingName = SharedMemoryCommon::kDefaultSecurityMessagesName;
 106         bool doFork = false;
 107         bool reExecute = false;
 108         int workerTimeout = 0;
 109         int maxThreads = 0;
 110         bool waitForClients = true;
 111     bool mdsIsInstalled = false;
 112         const char *tokenCacheDir = "/var/db/TokenCache";
 113         const char *smartCardOptions = getenv("SMARTCARDS");
 114         uint32_t keychainAclDefault = CSSM_ACL_KEYCHAIN_PROMPT_INVALID | CSSM_ACL_KEYCHAIN_PROMPT_UNSIGNED;
 115         unsigned int verbose = 0;
 116
 117         // check for the Installation-DVD environment and modify some default arguments if found
 118         if (access("/etc/rc.cdrom", F_OK) == 0) {       // /etc/rc.cdrom exists
 119         secnotice("SecServer", "starting in installmode");
 120                 smartCardOptions = "off";       // needs writable directories that aren't
 121         }
 122
 123         // parse command line arguments
 124         extern char *optarg;
 125         extern int optind;
 126         int arg;
 127         while ((arg = getopt(argc, argv, "c:dE:imN:s:t:T:uvWX")) != -1) {
 128                 switch (arg) {
 129                 case 'c':
 130                         tokenCacheDir = optarg;
 131                         break;
 132                 case 'd':
 133                         debugMode = true;
 134                         break;
 135         case 'E':
 136             /* was entropyFile, kept to preserve ABI */
 137             break;
 138                 case 'i':
 139                         keychainAclDefault &= ~CSSM_ACL_KEYCHAIN_PROMPT_INVALID;
 140                         break;
 141         case 'm':
 142             mdsIsInstalled = true;
 143             break;
 144                 case 'N':
 145                         bootstrapName = optarg;
 146                         break;
 147                 case 's':
 148                         smartCardOptions = optarg;
 149                         break;
 150                 case 't':
 151                         if ((maxThreads = atoi(optarg)) < 0)
 152                                 maxThreads = 0;
 153                         break;
 154                 case 'T':
 155                         if ((workerTimeout = atoi(optarg)) < 0)
 156                                 workerTimeout = 0;
 157                         break;
 158                 case 'W':
 159                         waitForClients = false;
 160                         break;
 161                 case 'u':
 162                         keychainAclDefault &= ~CSSM_ACL_KEYCHAIN_PROMPT_UNSIGNED;
 163                         break;
 164                 case 'v':
 165                         verbose++;
 166                         break;
 167                 case 'X':
 168                         doFork = true;
 169                         reExecute = true;
 170                         break;
 171                 default:
 172                         usage(argv[0]);
 173                 }
 174         }
 175
 176         // take no non-option arguments
 177         if (optind < argc)
 178                 usage(argv[0]);
 179
 180         // figure out the bootstrap name
 181     if (!bootstrapName) {
 182                 bootstrapName = getenv(SECURITYSERVER_BOOTSTRAP_ENV);
 183                 if (!bootstrapName)
 184                 {
 185                         bootstrapName = SECURITYSERVER_BOOTSTRAP_NAME;
 186                 }
 187                 else
 188                 {
 189 #ifndef __clang_analyzer__
 190                         messagingName = bootstrapName;
 191 #endif
 192                 }
 193         }
 194         else
 195         {
 196 #ifndef __clang_analyzer__
 197                 messagingName = bootstrapName;
 198 #endif
 199         }
 200
 201         // configure logging first
 202         if (debugMode) {
 203                 Syslog::open(bootstrapName, LOG_AUTHPRIV, LOG_PERROR);
 204                 Syslog::notice("%s started in debug mode", argv[0]);
 205         } else {
 206                 Syslog::open(bootstrapName, LOG_AUTHPRIV, LOG_CONS);
 207         }
 208
 209     // if we're not running as root in production mode, fail
 210     // in debug mode, issue a warning
 211     if (uid_t uid = getuid()) {
 212 #if defined(NDEBUG)
 213         Syslog::alert("Tried to run securityd as user %d: aborted", uid);
 214         fprintf(stderr, "You are not allowed to run securityd\n");
 215         exit(1);
 216 #else
 217         fprintf(stderr, "securityd is unprivileged (uid=%d); some features may not work.\n", uid);
 218 #endif //NDEBUG
 219     }
 220
 221     // turn into a properly diabolical daemon unless debugMode is on
 222     if (!debugMode && getppid() != 1) {
 223                 if (!Daemon::incarnate(doFork))
 224                         exit(1);        // can't daemonize
 225
 226                 if (reExecute && !Daemon::executeSelf(argv))
 227                         exit(1);        // can't self-execute
 228         }
 229
 230     // arm signal handlers; code below may generate signals we want to see
 231     if (signal(SIGCHLD, handleSignals) == SIG_ERR
 232                 || signal(SIGINT, handleSignals) == SIG_ERR
 233                 || signal(SIGTERM, handleSignals) == SIG_ERR
 234                 || signal(SIGPIPE, handleSignals) == SIG_ERR
 235 #if !defined(NDEBUG)
 236                 || signal(SIGUSR1, handleSignals) == SIG_ERR
 237 #endif //NDEBUG
 238                 || signal(SIGUSR2, handleSignals) == SIG_ERR) {
 239                 perror("signal");
 240                 exit(1);
 241         }
 242
 243 // The clang static analyzer isn't a big fan of our "object creation hooks object into global pointer graph" model.
 244 // Tell it not to worry.
 245 #ifndef __clang_analyzer__
 246         // introduce all supported ACL subject types
 247         new AnyAclSubject::Maker();
 248         new PasswordAclSubject::Maker();
 249     new ProtectedPasswordAclSubject::Maker();
 250     new PromptedAclSubject::Maker();
 251         new ThresholdAclSubject::Maker();
 252         new CommentAclSubject::Maker();
 253         new ProcessAclSubject::Maker();
 254         new CodeSignatureAclSubject::Maker();
 255         new KeychainPromptAclSubject::Maker(keychainAclDefault);
 256         new PartitionAclSubject::Maker();
 257         new PreAuthorizationAcls::OriginMaker();
 258     new PreAuthorizationAcls::SourceMaker();
 259 #endif
 260     // establish the code equivalents database
 261     CodeSignatures codeSignatures;
 262
 263
 264     // create the main server object and register it
 265         Server server(codeSignatures, bootstrapName);
 266
 267     // Remember the primary service port to send signal events to
 268     gMainServerPort = server.primaryServicePort();
 269
 270     // set server configuration from arguments, if specified
 271         if (workerTimeout)
 272                 server.timeout(workerTimeout);
 273         if (maxThreads)
 274                 server.maxThreads(maxThreads);
 275         server.floatingThread(true);
 276         server.waitForClients(waitForClients);
 277         server.verbosity(verbose);
 278
 279         // create a smartcard monitor to manage external token devices
 280         gPCSC = new PCSCMonitor(server, tokenCacheDir, scOptions(smartCardOptions));
 281
 282     // create the RootSession object (if -d, give it graphics and tty attributes)
 283     RootSession rootSession(debugMode ? (sessionHasGraphicAccess | sessionHasTTY) : 0, server);
 284
 285         // create a monitor thread to watch for audit session events
 286         AuditMonitor audits(gMainServerPort);
 287         audits.run();
 288
 289     // install MDS (if needed) and initialize the local CSSM
 290     server.loadCssm(mdsIsInstalled);
 291
 292 #ifndef __clang_analyzer__
 293         // create the shared memory notification hub
 294         new SharedMemoryListener(messagingName, kSharedMemoryPoolSize);
 295 #endif
 296
 297
 298         // okay, we're ready to roll
 299     secnotice("SecServer", "Entering service as %s", (char*)bootstrapName);
 300         Syslog::notice("Entering service");
 301
 302         // go
 303         server.run();
 304
 305         // fell out of runloop (should not happen)
 306         Syslog::alert("Aborting");
 307     return 1;
 308 }
 309
 310
 311 //
 312 // Issue usage message and die
 313 //
 314 static void usage(const char *me)
 315 {
 316         fprintf(stderr, "Usage: %s [-dwX]"
 317                 "\n\t[-c tokencache]                        smartcard token cache directory"
 318                 "\n\t[-e equivDatabase]                                         path to code equivalence database"
 319                 "\n\t[-N serviceName]                       MACH service name"
 320                 "\n\t[-s off|on|conservative|aggressive]    smartcard operation level"
 321                 "\n\t[-t maxthreads] [-T threadTimeout]     server thread control"
 322                 "\n", me);
 323         exit(2);
 324 }
 325
 326 const CFStringRef kTKSmartCardPreferencesDomain = CFSTR("com.apple.security.smartcard");
 327 const CFStringRef kTKLegacyTokendPreferencesKey  = CFSTR("Legacy");
 328
 329 static bool legacyTokensEnabled() {
 330     bool result = false;
 331     CFPropertyListRef value = CFPreferencesCopyValue(kTKLegacyTokendPreferencesKey, kTKSmartCardPreferencesDomain, kCFPreferencesAnyUser, kCFPreferencesCurrentHost);
 332     if (value) {
 333         if (CFEqual(value, kCFBooleanTrue)) {
 334             result = true;
 335         }
 336         CFRelease(value);
 337     }
 338     return result;
 339 }
 340
 341 //
 342 // Translate strings (e.g. "conservative") into PCSCMonitor service levels
 343 //
 344 static PCSCMonitor::ServiceLevel scOptions(const char *optionString)
 345 {
 346     if (!legacyTokensEnabled())
 347         return PCSCMonitor::forcedOff;
 348
 349     if (optionString)
 350                 if (!strcmp(optionString, "off"))
 351                         return PCSCMonitor::forcedOff;
 352                 else if (!strcmp(optionString, "on"))
 353                         return PCSCMonitor::externalDaemon;
 354                 else if (!strcmp(optionString, "conservative"))
 355                         return PCSCMonitor::externalDaemon;
 356                 else if (!strcmp(optionString, "aggressive"))
 357                         return PCSCMonitor::externalDaemon;
 358                 else if (!strcmp(optionString, "external"))
 359                         return PCSCMonitor::externalDaemon;
 360                 else
 361                         usage("securityd");
 362         else
 363                 return PCSCMonitor::externalDaemon;
 364 }
 365
 366
 367 //
 368 // Handle signals.
 369 // We send ourselves a message (through the "self" service), so actual
 370 // actions happen on the normal event loop path. Note that another thread
 371 // may be picking up the message immediately.
 372 //
 373 static void handleSignals(int sig)
 374 {
 375         (void)self_client_handleSignal(gMainServerPort, mach_task_self(), sig);
 376 }