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 "authority.h"
  33 #include "session.h"
  34 #include "notifications.h"
  35 #include "pcscmonitor.h"
  36 #include "auditevents.h"
  37 #include "self.h"
  38
  39 #include <security_utilities/daemon.h>
  40 #include <security_utilities/machserver.h>
  41 #include <security_utilities/logging.h>
  42
  43 #include <Security/SecKeychainPriv.h>
  44
  45 #include <unistd.h>
  46 #include <sys/types.h>
  47 #include <signal.h>
  48 #include <syslog.h>
  49
  50 // ACL subject types (their makers are instantiated here)
  51 #include <security_cdsa_utilities/acl_any.h>
  52 #include <security_cdsa_utilities/acl_password.h>
  53 #include <security_cdsa_utilities/acl_prompted.h>
  54 #include <security_cdsa_utilities/acl_protectedpw.h>
  55 #include <security_cdsa_utilities/acl_threshold.h>
  56 #include <security_cdsa_utilities/acl_codesigning.h>
  57 #include <security_cdsa_utilities/acl_process.h>
  58 #include <security_cdsa_utilities/acl_comment.h>
  59 #include <security_cdsa_utilities/acl_preauth.h>
  60 #include "acl_keychain.h"
  61 #include "acl_partition.h"
  62
  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
  71
  72 static Port gMainServerPort;
  73 PCSCMonitor *gPCSC;
  74
  75
  76 //
  77 // Main driver
  78 //
  79 int main(int argc, char *argv[])
  80 {
  81         // clear the umask - we know what we're doing
  82         secdebug("SS", "starting umask was 0%o", ::umask(0));
  83         ::umask(0);
  84
  85         // tell the keychain (client) layer to turn off the server interface
  86         SecKeychainSetServerMode();
  87
  88         // program arguments (preset to defaults)
  89         bool debugMode = false;
  90         const char *bootstrapName = NULL;
  91         const char* messagingName = SECURITY_MESSAGES_NAME;
  92         bool doFork = false;
  93         bool reExecute = false;
  94         int workerTimeout = 0;
  95         int maxThreads = 0;
  96         bool waitForClients = true;
  97     bool mdsIsInstalled = false;
  98         const char *authorizationConfig = "/etc/authorization";
  99         const char *tokenCacheDir = "/var/db/TokenCache";
 100     const char *entropyFile = "/var/db/SystemEntropyCache";
 101         const char *smartCardOptions = getenv("SMARTCARDS");
 102         uint32_t keychainAclDefault = CSSM_ACL_KEYCHAIN_PROMPT_INVALID | CSSM_ACL_KEYCHAIN_PROMPT_UNSIGNED;
 103         unsigned int verbose = 0;
 104
 105         // check for the Installation-DVD environment and modify some default arguments if found
 106         if (access("/etc/rc.cdrom", F_OK) == 0) {       // /etc/rc.cdrom exists
 107                 SECURITYD_INSTALLMODE();
 108                 smartCardOptions = "off";       // needs writable directories that aren't
 109         }
 110
 111         // parse command line arguments
 112         extern char *optarg;
 113         extern int optind;
 114         int arg;
 115         while ((arg = getopt(argc, argv, "a:c:dE:imN:s:t:T:uvWX")) != -1) {
 116                 switch (arg) {
 117                 case 'a':
 118                         authorizationConfig = optarg;
 119                         break;
 120                 case 'c':
 121                         tokenCacheDir = optarg;
 122                         break;
 123                 case 'd':
 124                         debugMode = true;
 125                         break;
 126         case 'E':
 127             entropyFile = optarg;
 128             break;
 129                 case 'i':
 130                         keychainAclDefault &= ~CSSM_ACL_KEYCHAIN_PROMPT_INVALID;
 131                         break;
 132         case 'm':
 133             mdsIsInstalled = true;
 134             break;
 135                 case 'N':
 136                         bootstrapName = optarg;
 137                         break;
 138                 case 's':
 139                         smartCardOptions = optarg;
 140                         break;
 141                 case 't':
 142                         if ((maxThreads = atoi(optarg)) < 0)
 143                                 maxThreads = 0;
 144                         break;
 145                 case 'T':
 146                         if ((workerTimeout = atoi(optarg)) < 0)
 147                                 workerTimeout = 0;
 148                         break;
 149                 case 'W':
 150                         waitForClients = false;
 151                         break;
 152                 case 'u':
 153                         keychainAclDefault &= ~CSSM_ACL_KEYCHAIN_PROMPT_UNSIGNED;
 154                         break;
 155                 case 'v':
 156                         verbose++;
 157                         break;
 158                 case 'X':
 159                         doFork = true;
 160                         reExecute = true;
 161                         break;
 162                 default:
 163                         usage(argv[0]);
 164                 }
 165         }
 166
 167         // take no non-option arguments
 168         if (optind < argc)
 169                 usage(argv[0]);
 170
 171         // figure out the bootstrap name
 172     if (!bootstrapName) {
 173                 bootstrapName = getenv(SECURITYSERVER_BOOTSTRAP_ENV);
 174                 if (!bootstrapName)
 175                 {
 176                         bootstrapName = SECURITYSERVER_BOOTSTRAP_NAME;
 177                 }
 178                 else
 179                 {
 180                         messagingName = bootstrapName;
 181                 }
 182         }
 183         else
 184         {
 185                 messagingName = bootstrapName;
 186         }
 187
 188         // configure logging first
 189         if (debugMode) {
 190                 Syslog::open(bootstrapName, LOG_AUTHPRIV, LOG_PERROR);
 191                 Syslog::notice("%s started in debug mode", argv[0]);
 192         } else {
 193                 Syslog::open(bootstrapName, LOG_AUTHPRIV, LOG_CONS);
 194         }
 195
 196     // if we're not running as root in production mode, fail
 197     // in debug mode, issue a warning
 198     if (uid_t uid = getuid()) {
 199 #if defined(NDEBUG)
 200         Syslog::alert("Tried to run securityd as user %d: aborted", uid);
 201         fprintf(stderr, "You are not allowed to run securityd\n");
 202         exit(1);
 203 #else
 204         fprintf(stderr, "securityd is unprivileged (uid=%d); some features may not work.\n", uid);
 205 #endif //NDEBUG
 206     }
 207
 208     // turn into a properly diabolical daemon unless debugMode is on
 209     if (!debugMode && getppid() != 1) {
 210                 if (!Daemon::incarnate(doFork))
 211                         exit(1);        // can't daemonize
 212
 213                 if (reExecute && !Daemon::executeSelf(argv))
 214                         exit(1);        // can't self-execute
 215         }
 216
 217     // arm signal handlers; code below may generate signals we want to see
 218     if (signal(SIGCHLD, handleSignals) == SIG_ERR
 219                 || signal(SIGINT, handleSignals) == SIG_ERR
 220                 || signal(SIGTERM, handleSignals) == SIG_ERR
 221                 || signal(SIGPIPE, handleSignals) == SIG_ERR
 222 #if !defined(NDEBUG)
 223                 || signal(SIGUSR1, handleSignals) == SIG_ERR
 224 #endif //NDEBUG
 225                 || signal(SIGUSR2, handleSignals) == SIG_ERR) {
 226                 perror("signal");
 227                 exit(1);
 228         }
 229
 230         // create an Authorization engine
 231         Authority authority(authorizationConfig);
 232
 233         // introduce all supported ACL subject types
 234         new AnyAclSubject::Maker();
 235         new PasswordAclSubject::Maker();
 236     new ProtectedPasswordAclSubject::Maker();
 237     new PromptedAclSubject::Maker();
 238         new ThresholdAclSubject::Maker();
 239         new CommentAclSubject::Maker();
 240         new ProcessAclSubject::Maker();
 241         new CodeSignatureAclSubject::Maker();
 242         new KeychainPromptAclSubject::Maker(keychainAclDefault);
 243         new PartitionAclSubject::Maker();
 244         new PreAuthorizationAcls::OriginMaker();
 245     new PreAuthorizationAcls::SourceMaker();
 246
 247     // establish the code equivalents database
 248     CodeSignatures codeSignatures;
 249
 250     // create the main server object and register it
 251         Server server(authority, codeSignatures, bootstrapName);
 252
 253     // Remember the primary service port to send signal events to
 254     gMainServerPort = server.primaryServicePort();
 255
 256     // set server configuration from arguments, if specified
 257         if (workerTimeout)
 258                 server.timeout(workerTimeout);
 259         if (maxThreads)
 260                 server.maxThreads(maxThreads);
 261         server.floatingThread(true);
 262         server.waitForClients(waitForClients);
 263         server.verbosity(verbose);
 264
 265         // add the RNG seed timer
 266 # if defined(NDEBUG)
 267     EntropyManager entropy(server, entropyFile);
 268 # else
 269     if (getuid() == 0) new EntropyManager(server, entropyFile);
 270 # endif
 271
 272         // create a smartcard monitor to manage external token devices
 273         gPCSC = new PCSCMonitor(server, tokenCacheDir, scOptions(smartCardOptions));
 274
 275     // create the RootSession object (if -d, give it graphics and tty attributes)
 276     RootSession rootSession(debugMode ? (sessionHasGraphicAccess | sessionHasTTY) : 0, server);
 277
 278         // create a monitor thread to watch for audit session events
 279         AuditMonitor audits(gMainServerPort);
 280         audits.run();
 281
 282     // install MDS (if needed) and initialize the local CSSM
 283     server.loadCssm(mdsIsInstalled);
 284
 285         // create the shared memory notification hub
 286         new SharedMemoryListener(messagingName, kSharedMemoryPoolSize);
 287
 288         // okay, we're ready to roll
 289         SECURITYD_INITIALIZED((char*)bootstrapName);
 290         Syslog::notice("Entering service");
 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 [-dwX]"
 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::externalDaemon;
 328                 else if (!strcmp(optionString, "conservative"))
 329                         return PCSCMonitor::externalDaemon;
 330                 else if (!strcmp(optionString, "aggressive"))
 331                         return PCSCMonitor::externalDaemon;
 332                 else if (!strcmp(optionString, "external"))
 333                         return PCSCMonitor::externalDaemon;
 334                 else
 335                         usage("securityd");
 336         else
 337                 return PCSCMonitor::externalDaemon;
 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         SECURITYD_SIGNAL_RECEIVED(sig);
 350         if (kern_return_t rc = self_client_handleSignal(gMainServerPort, mach_task_self(), sig))
 351                 Syslog::error("self-send failed (mach error %d)", rc);
 352 }