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 129             fprintf(stderr, "%s: the -f option is obsolete\n", argv[0]);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