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 "session.h"
  32 #include "notifications.h"
  33 #include "pcscmonitor.h"
  34 #include "auditevents.h"
  35 #include "self.h"
  36 #include "util.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 #include <sandbox.h>
  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 static bool legacyTokensEnabled(void);
  71
  72 static Port gMainServerPort;
  73 PCSCMonitor *gPCSC;
  74
  75
  76 //
  77 // Main driver
  78 //
  79 int main(int argc, char *argv[])
  80 {
  81         DisableLocalization();
  82
  83         // clear the umask - we know what we're doing
  84         secnotice("SecServer", "starting umask was 0%o", ::umask(0));
  85         ::umask(0);
  86
  87         // tell the keychain (client) layer to turn off the server interface
  88         SecKeychainSetServerMode();
  89
  90     const char *params[] = {"LEGACY_TOKENS_ENABLED", legacyTokensEnabled() ? "YES" : "NO", NULL};
  91     char* errorbuf = NULL;
  92     if (sandbox_init_with_parameters("com.apple.securityd", SANDBOX_NAMED, params, &errorbuf)) {
  93         seccritical("SecServer: unable to enter sandbox: %{public}s", errorbuf);
  94         if (errorbuf) {
  95             sandbox_free_error(errorbuf);
  96         }
  97         exit(1);
  98     } else {
  99         secnotice("SecServer", "entered sandbox");
 100     }
 101
 102         // program arguments (preset to defaults)
 103         bool debugMode = false;
 104         bool doFork = false;
 105         bool reExecute = false;
 106         int workerTimeout = 0;
 107         int maxThreads = 0;
 108         bool waitForClients = true;
 109     bool mdsIsInstalled = false;
 110         const char *tokenCacheDir = "/var/db/TokenCache";
 111         const char *smartCardOptions = getenv("SMARTCARDS");
 112         uint32_t keychainAclDefault = CSSM_ACL_KEYCHAIN_PROMPT_INVALID | CSSM_ACL_KEYCHAIN_PROMPT_UNSIGNED;
 113         unsigned int verbose = 0;
 114
 115         // check for the Installation-DVD environment and modify some default arguments if found
 116         if (access("/etc/rc.cdrom", F_OK) == 0) {       // /etc/rc.cdrom exists
 117         secnotice("SecServer", "starting in installmode");
 118                 smartCardOptions = "off";       // needs writable directories that aren't
 119         }
 120
 121         // parse command line arguments
 122         extern char *optarg;
 123         extern int optind;
 124         int arg;
 125         while ((arg = getopt(argc, argv, "c:dE:ims:t:T:uvWX")) != -1) {
 126                 switch (arg) {
 127                 case 'c':
 128                         tokenCacheDir = optarg;
 129                         break;
 130                 case 'd':
 131                         debugMode = true;
 132                         break;
 133         case 'E':
 134             /* was entropyFile, kept to preserve ABI */
 135             break;
 136                 case 'i':
 137                         keychainAclDefault &= ~CSSM_ACL_KEYCHAIN_PROMPT_INVALID;
 138                         break;
 139         case 'm':
 140             mdsIsInstalled = true;
 141             break;
 142                 case 's':
 143                         smartCardOptions = optarg;
 144                         break;
 145                 case 't':
 146                         if ((maxThreads = atoi(optarg)) < 0)
 147                                 maxThreads = 0;
 148                         break;
 149                 case 'T':
 150                         if ((workerTimeout = atoi(optarg)) < 0)
 151                                 workerTimeout = 0;
 152                         break;
 153                 case 'W':
 154                         waitForClients = false;
 155                         break;
 156                 case 'u':
 157                         keychainAclDefault &= ~CSSM_ACL_KEYCHAIN_PROMPT_UNSIGNED;
 158                         break;
 159                 case 'v':
 160                         verbose++;
 161                         break;
 162                 case 'X':
 163                         doFork = true;
 164                         reExecute = true;
 165                         break;
 166                 default:
 167                         usage(argv[0]);
 168                 }
 169         }
 170
 171         // take no non-option arguments
 172         if (optind < argc) {
 173                 usage(argv[0]);
 174         }
 175
 176         const char *bootstrapName = SECURITYSERVER_BOOTSTRAP_NAME;
 177         const char* messagingName = SharedMemoryCommon::kDefaultSecurityMessagesName;
 178
 179         // configure logging first
 180         if (debugMode) {
 181                 Syslog::open(bootstrapName, LOG_AUTHPRIV, LOG_PERROR);
 182                 Syslog::notice("%s started in debug mode", argv[0]);
 183         } else {
 184                 Syslog::open(bootstrapName, LOG_AUTHPRIV, LOG_CONS);
 185         }
 186
 187     // if we're not running as root in production mode, fail
 188     // in debug mode, issue a warning
 189     if (uid_t uid = getuid()) {
 190 #if defined(NDEBUG)
 191         Syslog::alert("Tried to run securityd as user %d: aborted", uid);
 192         fprintf(stderr, "You are not allowed to run securityd\n");
 193         exit(1);
 194 #else
 195         fprintf(stderr, "securityd is unprivileged (uid=%d); some features may not work.\n", uid);
 196 #endif //NDEBUG
 197     }
 198
 199     // turn into a properly diabolical daemon unless debugMode is on
 200     if (!debugMode && getppid() != 1) {
 201                 if (!Daemon::incarnate(doFork))
 202                         exit(1);        // can't daemonize
 203
 204                 if (reExecute && !Daemon::executeSelf(argv))
 205                         exit(1);        // can't self-execute
 206         }
 207
 208     // arm signal handlers; code below may generate signals we want to see
 209     if (signal(SIGCHLD, handleSignals) == SIG_ERR
 210                 || signal(SIGINT, handleSignals) == SIG_ERR
 211                 || signal(SIGTERM, handleSignals) == SIG_ERR
 212                 || signal(SIGPIPE, handleSignals) == SIG_ERR
 213 #if !defined(NDEBUG)
 214                 || signal(SIGUSR1, handleSignals) == SIG_ERR
 215 #endif //NDEBUG
 216                 || signal(SIGUSR2, handleSignals) == SIG_ERR) {
 217                 perror("signal");
 218                 exit(1);
 219         }
 220
 221 // The clang static analyzer isn't a big fan of our "object creation hooks object into global pointer graph" model.
 222 // Tell it not to worry.
 223 #ifndef __clang_analyzer__
 224         // introduce all supported ACL subject types
 225         new AnyAclSubject::Maker();
 226         new PasswordAclSubject::Maker();
 227     new ProtectedPasswordAclSubject::Maker();
 228     new PromptedAclSubject::Maker();
 229         new ThresholdAclSubject::Maker();
 230         new CommentAclSubject::Maker();
 231         new ProcessAclSubject::Maker();
 232         new CodeSignatureAclSubject::Maker();
 233         new KeychainPromptAclSubject::Maker(keychainAclDefault);
 234         new PartitionAclSubject::Maker();
 235         new PreAuthorizationAcls::OriginMaker();
 236     new PreAuthorizationAcls::SourceMaker();
 237 #endif
 238     // establish the code equivalents database
 239     CodeSignatures codeSignatures;
 240
 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         // create a smartcard monitor to manage external token devices
 258         gPCSC = new PCSCMonitor(server, tokenCacheDir, scOptions(smartCardOptions));
 259
 260     // create the RootSession object (if -d, give it graphics and tty attributes)
 261     RootSession rootSession(debugMode ? (sessionHasGraphicAccess | sessionHasTTY) : 0, server);
 262
 263         // create a monitor thread to watch for audit session events
 264         AuditMonitor audits(gMainServerPort);
 265         audits.run();
 266
 267     // install MDS (if needed) and initialize the local CSSM
 268     server.loadCssm(mdsIsInstalled);
 269
 270 #ifndef __clang_analyzer__
 271         // create the shared memory notification hub
 272         new SharedMemoryListener(messagingName, kSharedMemoryPoolSize);
 273 #endif
 274
 275
 276         // okay, we're ready to roll
 277     secnotice("SecServer", "Entering service as %s", (char*)bootstrapName);
 278         Syslog::notice("Entering service");
 279
 280         // go
 281         server.run();
 282
 283         // fell out of runloop (should not happen)
 284         Syslog::alert("Aborting");
 285     return 1;
 286 }
 287
 288
 289 //
 290 // Issue usage message and die
 291 //
 292 static void usage(const char *me)
 293 {
 294         fprintf(stderr, "Usage: %s [-dwX]"
 295                 "\n\t[-c tokencache]                        smartcard token cache directory"
 296                 "\n\t[-e equivDatabase]                                         path to code equivalence database"
 297                 "\n\t[-s off|on|conservative|aggressive]    smartcard operation level"
 298                 "\n\t[-t maxthreads] [-T threadTimeout]     server thread control"
 299                 "\n", me);
 300         exit(2);
 301 }
 302
 303 const CFStringRef kTKSmartCardPreferencesDomain = CFSTR("com.apple.security.smartcard");
 304 const CFStringRef kTKLegacyTokendPreferencesKey  = CFSTR("Legacy");
 305
 306 static bool legacyTokensEnabled() {
 307     bool result = false;
 308     CFPropertyListRef value = CFPreferencesCopyValue(kTKLegacyTokendPreferencesKey, kTKSmartCardPreferencesDomain, kCFPreferencesAnyUser, kCFPreferencesCurrentHost);
 309     if (value) {
 310         if (CFEqual(value, kCFBooleanTrue)) {
 311             result = true;
 312         }
 313         CFRelease(value);
 314     }
 315     return result;
 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 (!legacyTokensEnabled())
 324         return PCSCMonitor::forcedOff;
 325
 326     if (optionString)
 327                 if (!strcmp(optionString, "off"))
 328                         return PCSCMonitor::forcedOff;
 329                 else if (!strcmp(optionString, "on"))
 330                         return PCSCMonitor::externalDaemon;
 331                 else if (!strcmp(optionString, "conservative"))
 332                         return PCSCMonitor::externalDaemon;
 333                 else if (!strcmp(optionString, "aggressive"))
 334                         return PCSCMonitor::externalDaemon;
 335                 else if (!strcmp(optionString, "external"))
 336                         return PCSCMonitor::externalDaemon;
 337                 else
 338                         usage("securityd");
 339         else
 340                 return PCSCMonitor::externalDaemon;
 341 }
 342
 343
 344 //
 345 // Handle signals.
 346 // We send ourselves a message (through the "self" service), so actual
 347 // actions happen on the normal event loop path. Note that another thread
 348 // may be picking up the message immediately.
 349 //
 350 static void handleSignals(int sig)
 351 {
 352         (void)self_client_handleSignal(gMainServerPort, mach_task_self(), sig);
 353 }