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