src/main.cpp

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, 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 "authority.h"
  33 #include "session.h"
  34 #include "pcscmonitor.h"
  35 #include "self.h"
  36
  37 #include <security_utilities/daemon.h>
  38 #include <security_utilities/machserver.h>
  39 #include <security_utilities/logging.h>
  40 #include <security_utilities/ktracecodes.h>
  41 #include <security_cdsa_client/osxsigner.h>
  42
  43 #include <unistd.h>
  44 #include <sys/types.h>
  45 #include <signal.h>
  46 #include <syslog.h>
  47
  48
  49 // #define PERFORMANCE_MEASUREMENT 1
  50
  51 #ifdef PERFORMANCE_MEASUREMENT
  52 #include <mach/mach_time.h>
  53 #endif
  54
  55 // ACL subject types (their makers are instantiated here)
  56 #include <security_cdsa_utilities/acl_any.h>
  57 #include <security_cdsa_utilities/acl_password.h>
  58 #include <security_cdsa_utilities/acl_prompted.h>
  59 #include <security_cdsa_utilities/acl_protectedpw.h>
  60 #include <security_cdsa_utilities/acl_threshold.h>
  61 #include <security_cdsa_utilities/acl_codesigning.h>
  62 #include <security_cdsa_utilities/acl_process.h>
  63 #include <security_cdsa_utilities/acl_comment.h>
  64 #include <security_cdsa_utilities/acl_preauth.h>
  65 #include "acl_keychain.h"
  66
  67
  68 //
  69 // Local functions of the main program driver
  70 //
  71 static void usage(const char *me) __attribute__((noreturn));
  72 static void handleSignals(int sig);
  73 static PCSCMonitor::ServiceLevel scOptions(const char *optionString);
  74
  75
  76 static Port gMainServerPort;
  77
  78
  79 //
  80 // Main driver
  81 //
  82 int main(int argc, char *argv[])
  83 {
  84         #ifdef PERFORMANCE_MEASUREMENT
  85         // needed for automated timing of securityd startup
  86         uint64_t startTime = mach_absolute_time ();
  87         #endif
  88
  89     Debug::trace (kSecTraceSecurityServerStart);
  90
  91         // clear the umask - we know what we're doing
  92         secdebug("SS", "starting umask was 0%o", ::umask(0));
  93         ::umask(0);
  94
  95         // program arguments (preset to defaults)
  96         bool debugMode = false;
  97         const char *bootstrapName = NULL;
  98         bool doFork = false;
  99         bool reExecute = false;
 100         int workerTimeout = 0;
 101         int maxThreads = 0;
 102         const char *authorizationConfig = "/etc/authorization";
 103         const char *tokenCacheDir = "/var/db/TokenCache";
 104     const char *entropyFile = "/var/db/SystemEntropyCache";
 105         const char *equivDbFile = EQUIVALENCEDBPATH;
 106         const char *smartCardOptions = getenv("SMARTCARDS");
 107
 108         // parse command line arguments
 109         extern char *optarg;
 110         extern int optind;
 111         int arg;
 112         while ((arg = getopt(argc, argv, "a:c:de:E:fN:s:t:T:X")) != -1) {
 113                 switch (arg) {
 114                 case 'a':
 115                         authorizationConfig = optarg;
 116                         break;
 117                 case 'c':
 118                         tokenCacheDir = optarg;
 119                         break;
 120                 case 'd':
 121                         debugMode = true;
 122                         break;
 123                 case 'e':
 124                         equivDbFile = optarg;
 125                         break;
 126         case 'E':
 127             entropyFile = optarg;
 128             break;
 129         case 'f':
 130             fprintf(stderr, "%s: the -f option is obsolete\n", argv[0]);
 131             break;
 132                 case 'N':
 133                         bootstrapName = optarg;
 134                         break;
 135                 case 's':
 136                         smartCardOptions = optarg;
 137                         break;
 138                 case 't':
 139                         if ((maxThreads = atoi(optarg)) < 0)
 140                                 maxThreads = 0;
 141                         break;
 142                 case 'T':
 143                         if ((workerTimeout = atoi(optarg)) < 0)
 144                                 workerTimeout = 0;
 145                         break;
 146                 case 'X':
 147                         doFork = true;
 148                         reExecute = true;
 149                         break;
 150                 default:
 151                         usage(argv[0]);
 152                 }
 153         }
 154
 155         // take no non-option arguments
 156         if (optind < argc)
 157                 usage(argv[0]);
 158
 159         // figure out the bootstrap name
 160     if (!bootstrapName) {
 161                 bootstrapName = getenv(SECURITYSERVER_BOOTSTRAP_ENV);
 162                 if (!bootstrapName)
 163                         bootstrapName = SECURITYSERVER_BOOTSTRAP_NAME;
 164         }
 165
 166         // configure logging first
 167         if (debugMode) {
 168                 Syslog::open(bootstrapName, LOG_AUTHPRIV, LOG_PERROR);
 169                 Syslog::notice("%s started in debug mode", argv[0]);
 170         } else {
 171                 Syslog::open(bootstrapName, LOG_AUTHPRIV, LOG_CONS);
 172         }
 173
 174     // if we're not running as root in production mode, fail
 175     // in debug mode, issue a warning
 176     if (uid_t uid = getuid()) {
 177 #if defined(NDEBUG)
 178         Syslog::alert("Tried to run securityd as user %d: aborted", uid);
 179         fprintf(stderr, "You are not allowed to run securityd\n");
 180         exit(1);
 181 #else
 182         fprintf(stderr, "securityd is unprivileged; some features may not work.\n");
 183         secdebug("SS", "Running as user %d (you have been warned)", uid);
 184 #endif //NDEBUG
 185     }
 186
 187     // turn into a properly diabolical daemon unless debugMode is on
 188     if (!debugMode && getppid() != 1) {
 189                 if (!Daemon::incarnate(doFork))
 190                         exit(1);        // can't daemonize
 191
 192                 if (reExecute && !Daemon::executeSelf(argv))
 193                         exit(1);        // can't self-execute
 194         }
 195
 196     // arm signal handlers; code below may generate signals we want to see
 197     if (signal(SIGCHLD, handleSignals) == SIG_ERR)
 198         secdebug("SS", "Cannot handle SIGCHLD: errno=%d", errno);
 199     if (signal(SIGINT, handleSignals) == SIG_ERR)
 200         secdebug("SS", "Cannot handle SIGINT: errno=%d", errno);
 201     if (signal(SIGTERM, handleSignals) == SIG_ERR)
 202         secdebug("SS", "Cannot handle SIGTERM: errno=%d", errno);
 203 #if !defined(NDEBUG)
 204     if (signal(SIGUSR1, handleSignals) == SIG_ERR)
 205         secdebug("SS", "Cannot handle SIGHUP: errno=%d", errno);
 206 #endif //NDEBUG
 207
 208         // create a code signing engine
 209         CodeSigning::OSXSigner signer;
 210
 211         // create an Authorization engine
 212         Authority authority(authorizationConfig);
 213
 214         // establish the ACL machinery
 215         new AnyAclSubject::Maker();
 216         new PasswordAclSubject::Maker();
 217     new ProtectedPasswordAclSubject::Maker();
 218     new PromptedAclSubject::Maker();
 219         new ThresholdAclSubject::Maker();
 220     new CommentAclSubject::Maker();
 221         new ProcessAclSubject::Maker();
 222         new CodeSignatureAclSubject::Maker(signer);
 223     new KeychainPromptAclSubject::Maker();
 224     new PreAuthorizationAcls::OriginMaker();
 225     new PreAuthorizationAcls::SourceMaker();
 226
 227         // establish the code equivalents database
 228         CodeSignatures codeSignatures(equivDbFile);
 229
 230     // create the main server object and register it
 231         Server server(authority, codeSignatures, bootstrapName);
 232
 233     // Remember the primary service port to send signal events to
 234     gMainServerPort = server.primaryServicePort();
 235
 236     // set server configuration from arguments, if specified
 237         if (workerTimeout)
 238                 server.timeout(workerTimeout);
 239         if (maxThreads)
 240                 server.maxThreads(maxThreads);
 241
 242         // add the RNG seed timer
 243 # if defined(NDEBUG)
 244     EntropyManager entropy(server, entropyFile);
 245 # else
 246     if (getuid() == 0) new EntropyManager(server, entropyFile);
 247 # endif
 248
 249         // create a token-cache interface
 250 #if !defined(NDEBUG)
 251         if (const char *s = getenv("TOKENCACHE"))
 252                 tokenCacheDir = s;
 253 #endif //NDEBUG
 254
 255         // create a smartcard monitor to manage external token devices
 256         PCSCMonitor secureCards(server, tokenCacheDir, scOptions(smartCardOptions));
 257
 258     // create the RootSession object (if -d, give it graphics and tty attributes)
 259     RootSession rootSession(server,
 260                 debugMode ? (sessionHasGraphicAccess | sessionHasTTY) : 0);
 261
 262     // install MDS and initialize the local CSSM
 263     server.loadCssm();
 264
 265         // okay, we're ready to roll
 266         Syslog::notice("Entering service");
 267         secdebug("SS", "%s initialized", bootstrapName);
 268     Debug::trace (kSecTraceSecurityServerInitialized);
 269
 270         #ifdef PERFORMANCE_MEASUREMENT
 271         // needed for automated timing of securityd startup
 272         uint64_t endTime = mach_absolute_time ();
 273
 274         // compute how long it took to initialize
 275         uint64_t elapsedTime = endTime - startTime;
 276         mach_timebase_info_data_t multiplier;
 277         mach_timebase_info (&multiplier);
 278
 279         elapsedTime = elapsedTime * multiplier.numer / multiplier.denom;
 280
 281         FILE* f = fopen ("/var/log/startuptime.txt", "a");
 282         if (f == NULL)
 283         {
 284                 // probably not running as root.
 285                 f = fopen ("/tmp/startuptime.txt", "a");
 286         }
 287
 288         fprintf (f, "%lld\n", elapsedTime);
 289         fclose (f);
 290         #endif
 291
 292         // go
 293         server.run();
 294
 295         // fell out of runloop (should not happen)
 296         Syslog::alert("Aborting");
 297     return 1;
 298 }
 299
 300
 301 //
 302 // Issue usage message and die
 303 //
 304 static void usage(const char *me)
 305 {
 306         fprintf(stderr, "Usage: %s [-dX]"
 307                 "\n\t[-a authConfigFile]                    Authorization configuration file"
 308                 "\n\t[-c tokencache]                        smartcard token cache directory"
 309                 "\n\t[-e equivDatabase]                                         path to code equivalence database"
 310                 "\n\t[-N serviceName]                       MACH service name"
 311                 "\n\t[-s off|on|conservative|aggressive]    smartcard operation level"
 312                 "\n\t[-t maxthreads] [-T threadTimeout]     server thread control"
 313                 "\n", me);
 314         exit(2);
 315 }
 316
 317
 318 //
 319 // Translate strings (e.g. "conservative") into PCSCMonitor service levels
 320 //
 321 static PCSCMonitor::ServiceLevel scOptions(const char *optionString)
 322 {
 323         if (optionString)
 324                 if (!strcmp(optionString, "off"))
 325                         return PCSCMonitor::forcedOff;
 326                 else if (!strcmp(optionString, "on"))
 327                         return PCSCMonitor::forcedOn;
 328                 else if (!strcmp(optionString, "conservative"))
 329                         return PCSCMonitor::conservative;
 330                 else if (!strcmp(optionString, "aggressive"))
 331                         return PCSCMonitor::aggressive;
 332                 else if (!strcmp(optionString, "external"))
 333                         return PCSCMonitor::externalDaemon;
 334                 else
 335                         usage("securityd");
 336         else
 337                 return PCSCMonitor::aggressive;
 338 }
 339
 340
 341 //
 342 // Handle signals.
 343 // We send ourselves a message (through the "self" service), so actual
 344 // actions happen on the normal event loop path. Note that another thread
 345 // may be picking up the message immediately.
 346 //
 347 static void handleSignals(int sig)
 348 {
 349         if (kern_return_t rc = self_client_handleSignal(gMainServerPort, mach_task_self(), sig))
 350                 Syslog::error("self-send failed (mach error %d)", rc);
 351 }