src/main.cpp

   1 /*
   2  * Copyright (c) 2000-2007 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 "authority.h"
  33 #include "session.h"
  34 #include "notifications.h"
  35 #include "pcscmonitor.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
  61
  62 //
  63 // Local functions of the main program driver
  64 //
  65 static void usage(const char *me) __attribute__((noreturn));
  66 static void handleSignals(int sig);
  67 static PCSCMonitor::ServiceLevel scOptions(const char *optionString);
  68
  69
  70 static Port gMainServerPort;
  71 PCSCMonitor *gPCSC;
  72
  73
  74 //
  75 // Main driver
  76 //
  77 int main(int argc, char *argv[])
  78 {
  79         // clear the umask - we know what we're doing
  80         secdebug("SS", "starting umask was 0%o", ::umask(0));
  81         ::umask(0);
  82
  83         // tell the keychain (client) layer to turn off the server interface
  84         SecKeychainSetServerMode();
  85
  86         // program arguments (preset to defaults)
  87         bool debugMode = false;
  88         const char *bootstrapName = NULL;
  89         const char* messagingName = SECURITY_MESSAGES_NAME;
  90         bool doFork = false;
  91         bool reExecute = false;
  92         int workerTimeout = 0;
  93         int maxThreads = 0;
  94         bool waitForClients = true;
  95     bool mdsIsInstalled = false;
  96         const char *authorizationConfig = "/etc/authorization";
  97         const char *tokenCacheDir = "/var/db/TokenCache";
  98     const char *entropyFile = "/var/db/SystemEntropyCache";
  99         const char *equivDbFile = EQUIVALENCEDBPATH;
 100         const char *smartCardOptions = getenv("SMARTCARDS");
 101         uint32_t keychainAclDefault = CSSM_ACL_KEYCHAIN_PROMPT_INVALID | CSSM_ACL_KEYCHAIN_PROMPT_UNSIGNED;
 102         unsigned int verbose = 0;
 103
 104         // check for the Installation-DVD environment and modify some default arguments if found
 105         if (access("/etc/rc.cdrom", F_OK) == 0) {       // /etc/rc.cdrom exists
 106                 SECURITYD_INSTALLMODE();
 107                 smartCardOptions = "off";       // needs writable directories that aren't
 108         }
 109
 110         // parse command line arguments
 111         extern char *optarg;
 112         extern int optind;
 113         int arg;
 114         while ((arg = getopt(argc, argv, "a:c:de:E:fimN:s:t:T:uvWX")) != -1) {
 115                 switch (arg) {
 116                 case 'a':
 117                         authorizationConfig = optarg;
 118                         break;
 119                 case 'c':
 120                         tokenCacheDir = optarg;
 121                         break;
 122                 case 'd':
 123                         debugMode = true;
 124                         break;
 125                 case 'e':
 126                         equivDbFile = optarg;
 127                         break;
 128         case 'E':
 129             entropyFile = optarg;
 130             break;
 131         case 'f':
 132             fprintf(stderr, "%s: the -f option is obsolete\n", argv[0]);
 133             break;
 134                 case 'i':
 135                         keychainAclDefault &= ~CSSM_ACL_KEYCHAIN_PROMPT_INVALID;
 136                         break;
 137         case 'm':
 138             mdsIsInstalled = true;
 139             break;
 140                 case 'N':
 141                         bootstrapName = optarg;
 142                         break;
 143                 case 's':
 144                         smartCardOptions = optarg;
 145                         break;
 146                 case 't':
 147                         if ((maxThreads = atoi(optarg)) < 0)
 148                                 maxThreads = 0;
 149                         break;
 150                 case 'T':
 151                         if ((workerTimeout = atoi(optarg)) < 0)
 152                                 workerTimeout = 0;
 153                         break;
 154                 case 'W':
 155                         waitForClients = false;
 156                         break;
 157                 case 'u':
 158                         keychainAclDefault &= ~CSSM_ACL_KEYCHAIN_PROMPT_UNSIGNED;
 159                         break;
 160                 case 'v':
 161                         verbose++;
 162                         break;
 163                 case 'X':
 164                         doFork = true;
 165                         reExecute = true;
 166                         break;
 167                 default:
 168                         usage(argv[0]);
 169                 }
 170         }
 171
 172         // take no non-option arguments
 173         if (optind < argc)
 174                 usage(argv[0]);
 175
 176         // figure out the bootstrap name
 177     if (!bootstrapName) {
 178                 bootstrapName = getenv(SECURITYSERVER_BOOTSTRAP_ENV);
 179                 if (!bootstrapName)
 180                 {
 181                         bootstrapName = SECURITYSERVER_BOOTSTRAP_NAME;
 182                 }
 183                 else
 184                 {
 185                         messagingName = bootstrapName;
 186                 }
 187         }
 188         else
 189         {
 190                 messagingName = bootstrapName;
 191         }
 192
 193         // configure logging first
 194         if (debugMode) {
 195                 Syslog::open(bootstrapName, LOG_AUTHPRIV, LOG_PERROR);
 196                 Syslog::notice("%s started in debug mode", argv[0]);
 197         } else {
 198                 Syslog::open(bootstrapName, LOG_AUTHPRIV, LOG_CONS);
 199         }
 200
 201     // if we're not running as root in production mode, fail
 202     // in debug mode, issue a warning
 203     if (uid_t uid = getuid()) {
 204 #if defined(NDEBUG)
 205         Syslog::alert("Tried to run securityd as user %d: aborted", uid);
 206         fprintf(stderr, "You are not allowed to run securityd\n");
 207         exit(1);
 208 #else
 209         fprintf(stderr, "securityd is unprivileged (uid=%d); some features may not work.\n", uid);
 210 #endif //NDEBUG
 211     }
 212
 213     // turn into a properly diabolical daemon unless debugMode is on
 214     if (!debugMode && getppid() != 1) {
 215                 if (!Daemon::incarnate(doFork))
 216                         exit(1);        // can't daemonize
 217
 218                 if (reExecute && !Daemon::executeSelf(argv))
 219                         exit(1);        // can't self-execute
 220         }
 221
 222     // arm signal handlers; code below may generate signals we want to see
 223     if (signal(SIGCHLD, handleSignals) == SIG_ERR
 224                 || signal(SIGINT, handleSignals) == SIG_ERR
 225                 || signal(SIGTERM, handleSignals) == SIG_ERR
 226                 || signal(SIGPIPE, handleSignals) == SIG_ERR
 227 #if !defined(NDEBUG)
 228                 || signal(SIGUSR1, handleSignals) == SIG_ERR
 229 #endif //NDEBUG
 230                 || signal(SIGUSR2, handleSignals) == SIG_ERR) {
 231                 perror("signal");
 232                 exit(1);
 233         }
 234
 235         // create an Authorization engine
 236         Authority authority(authorizationConfig);
 237
 238         // introduce all supported ACL subject types
 239         new AnyAclSubject::Maker();
 240         new PasswordAclSubject::Maker();
 241     new ProtectedPasswordAclSubject::Maker();
 242     new PromptedAclSubject::Maker();
 243         new ThresholdAclSubject::Maker();
 244     new CommentAclSubject::Maker();
 245         new ProcessAclSubject::Maker();
 246         new CodeSignatureAclSubject::Maker();
 247     new KeychainPromptAclSubject::Maker(keychainAclDefault);
 248     new PreAuthorizationAcls::OriginMaker();
 249     new PreAuthorizationAcls::SourceMaker();
 250
 251         // establish the code equivalents database
 252         CodeSignatures codeSignatures(equivDbFile);
 253
 254     // create the main server object and register it
 255         Server server(authority, codeSignatures, bootstrapName);
 256
 257     // Remember the primary service port to send signal events to
 258     gMainServerPort = server.primaryServicePort();
 259
 260     // set server configuration from arguments, if specified
 261         if (workerTimeout)
 262                 server.timeout(workerTimeout);
 263         if (maxThreads)
 264                 server.maxThreads(maxThreads);
 265         server.floatingThread(true);
 266         server.waitForClients(waitForClients);
 267         server.verbosity(verbose);
 268
 269         // add the RNG seed timer
 270 # if defined(NDEBUG)
 271     EntropyManager entropy(server, entropyFile);
 272 # else
 273     if (getuid() == 0) new EntropyManager(server, entropyFile);
 274 # endif
 275
 276         // create a smartcard monitor to manage external token devices
 277         gPCSC = new PCSCMonitor(server, tokenCacheDir, scOptions(smartCardOptions));
 278
 279     // create the RootSession object (if -d, give it graphics and tty attributes)
 280     RootSession rootSession(server,
 281                 debugMode ? (sessionHasGraphicAccess | sessionHasTTY) : 0);
 282
 283     // install MDS (if needed) and initialize the local CSSM
 284     server.loadCssm(mdsIsInstalled);
 285
 286         // create the shared memory notification hub
 287         new SharedMemoryListener(messagingName, kSharedMemoryPoolSize);
 288
 289         // okay, we're ready to roll
 290         SECURITYD_INITIALIZED((char*)bootstrapName);
 291         Syslog::notice("Entering service");
 292
 293         // go
 294         server.run();
 295
 296         // fell out of runloop (should not happen)
 297         Syslog::alert("Aborting");
 298     return 1;
 299 }
 300
 301
 302 //
 303 // Issue usage message and die
 304 //
 305 static void usage(const char *me)
 306 {
 307         fprintf(stderr, "Usage: %s [-dwX]"
 308                 "\n\t[-a authConfigFile]                    Authorization configuration file"
 309                 "\n\t[-c tokencache]                        smartcard token cache directory"
 310                 "\n\t[-e equivDatabase]                                         path to code equivalence database"
 311                 "\n\t[-N serviceName]                       MACH service name"
 312                 "\n\t[-s off|on|conservative|aggressive]    smartcard operation level"
 313                 "\n\t[-t maxthreads] [-T threadTimeout]     server thread control"
 314                 "\n", me);
 315         exit(2);
 316 }
 317
 318
 319 //
 320 // Translate strings (e.g. "conservative") into PCSCMonitor service levels
 321 //
 322 static PCSCMonitor::ServiceLevel scOptions(const char *optionString)
 323 {
 324         if (optionString)
 325                 if (!strcmp(optionString, "off"))
 326                         return PCSCMonitor::forcedOff;
 327                 else if (!strcmp(optionString, "on"))
 328                         return PCSCMonitor::forcedOn;
 329                 else if (!strcmp(optionString, "conservative"))
 330                         return PCSCMonitor::conservative;
 331                 else if (!strcmp(optionString, "aggressive"))
 332                         return PCSCMonitor::aggressive;
 333                 else if (!strcmp(optionString, "external"))
 334                         return PCSCMonitor::externalDaemon;
 335                 else
 336                         usage("securityd");
 337         else
 338                 return PCSCMonitor::aggressive;
 339 }
 340
 341
 342 //
 343 // Handle signals.
 344 // We send ourselves a message (through the "self" service), so actual
 345 // actions happen on the normal event loop path. Note that another thread
 346 // may be picking up the message immediately.
 347 //
 348 static void handleSignals(int sig)
 349 {
 350         SECURITYD_SIGNAL_RECEIVED(sig);
 351         if (kern_return_t rc = self_client_handleSignal(gMainServerPort, mach_task_self(), sig))
 352                 Syslog::error("self-send failed (mach error %d)", rc);
 353 }