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 "auditevents.h"
  34 #include "self.h"
  35 #include "util.h"
  36
  37 #include <security_utilities/daemon.h>
  38 #include <security_utilities/machserver.h>
  39 #include <security_utilities/logging.h>
  40
  41 #include <Security/SecKeychainPriv.h>
  42
  43 #include <unistd.h>
  44 #include <sys/types.h>
  45 #include <signal.h>
  46 #include <syslog.h>
  47
  48 // ACL subject types (their makers are instantiated here)
  49 #include <security_cdsa_utilities/acl_any.h>
  50 #include <security_cdsa_utilities/acl_password.h>
  51 #include <security_cdsa_utilities/acl_prompted.h>
  52 #include <security_cdsa_utilities/acl_protectedpw.h>
  53 #include <security_cdsa_utilities/acl_threshold.h>
  54 #include <security_cdsa_utilities/acl_codesigning.h>
  55 #include <security_cdsa_utilities/acl_process.h>
  56 #include <security_cdsa_utilities/acl_comment.h>
  57 #include <security_cdsa_utilities/acl_preauth.h>
  58 #include "acl_keychain.h"
  59 #include "acl_partition.h"
  60
  61 #include <sandbox.h>
  62
  63 //
  64 // Local functions of the main program driver
  65 //
  66 static void usage(const char *me) __attribute__((noreturn));
  67 static void handleSignals(int sig);
  68
  69 static Port gMainServerPort;
  70
  71
  72 //
  73 // Main driver
  74 //
  75 int main(int argc, char *argv[])
  76 {
  77         DisableLocalization();
  78
  79         // clear the umask - we know what we're doing
  80         secnotice("SecServer", "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     const char *params[] = {"LEGACY_TOKENS_ENABLED", "NO", NULL};
  87     char* errorbuf = NULL;
  88     if (sandbox_init_with_parameters("com.apple.securityd", SANDBOX_NAMED, params, &errorbuf)) {
  89         seccritical("SecServer: unable to enter sandbox: %{public}s", errorbuf);
  90         if (errorbuf) {
  91             sandbox_free_error(errorbuf);
  92         }
  93         exit(1);
  94     } else {
  95         secnotice("SecServer", "entered sandbox");
  96     }
  97
  98         // program arguments (preset to defaults)
  99         bool debugMode = false;
 100         int workerTimeout = 0;
 101         int maxThreads = 0;
 102         bool waitForClients = true;
 103     bool mdsIsInstalled = false;
 104         uint32_t keychainAclDefault = CSSM_ACL_KEYCHAIN_PROMPT_INVALID | CSSM_ACL_KEYCHAIN_PROMPT_UNSIGNED;
 105         unsigned int verbose = 0;
 106
 107         // check for the Installation-DVD environment and modify some default arguments if found
 108         if (access("/etc/rc.cdrom", F_OK) == 0) {       // /etc/rc.cdrom exists
 109         secnotice("SecServer", "starting in installmode");
 110         }
 111
 112         // parse command line arguments
 113         extern char *optarg;
 114         extern int optind;
 115         int arg;
 116         while ((arg = getopt(argc, argv, ":dE:im:t:T:uvW")) != -1) {
 117                 switch (arg) {
 118                 case 'd':
 119                         debugMode = true;
 120                         break;
 121         case 'E':
 122             /* was entropyFile, kept to preserve ABI */
 123             break;
 124                 case 'i':
 125                         keychainAclDefault &= ~CSSM_ACL_KEYCHAIN_PROMPT_INVALID;
 126                         break;
 127         case 'm':
 128             mdsIsInstalled = true;
 129             break;
 130                 case 't':
 131                         if ((maxThreads = atoi(optarg)) < 0)
 132                                 maxThreads = 0;
 133                         break;
 134                 case 'T':
 135                         if ((workerTimeout = atoi(optarg)) < 0)
 136                                 workerTimeout = 0;
 137                         break;
 138                 case 'W':
 139                         waitForClients = false;
 140                         break;
 141                 case 'u':
 142                         keychainAclDefault &= ~CSSM_ACL_KEYCHAIN_PROMPT_UNSIGNED;
 143                         break;
 144                 case 'v':
 145                         verbose++;
 146                         break;
 147                 default:
 148                         usage(argv[0]);
 149                 }
 150         }
 151
 152         // take no non-option arguments
 153         if (optind < argc) {
 154                 usage(argv[0]);
 155         }
 156
 157         const char *bootstrapName = SECURITYSERVER_BOOTSTRAP_NAME;
 158         const char* messagingName = SharedMemoryCommon::kDefaultSecurityMessagesName;
 159
 160         // configure logging first
 161         if (debugMode) {
 162                 Syslog::open(bootstrapName, LOG_AUTHPRIV, LOG_PERROR);
 163                 Syslog::notice("%s started in debug mode", argv[0]);
 164         } else {
 165                 Syslog::open(bootstrapName, LOG_AUTHPRIV, LOG_CONS);
 166         }
 167
 168     // if we're not running as root in production mode, fail
 169     // in debug mode, issue a warning
 170     if (uid_t uid = getuid()) {
 171 #if defined(NDEBUG)
 172         Syslog::alert("Tried to run securityd as user %d: aborted", uid);
 173         fprintf(stderr, "You are not allowed to run securityd\n");
 174         exit(1);
 175 #else
 176         fprintf(stderr, "securityd is unprivileged (uid=%d); some features may not work.\n", uid);
 177 #endif //NDEBUG
 178     }
 179
 180     // turn into a properly diabolical daemon unless debugMode is on
 181     if (!debugMode && getppid() != 1 && !Daemon::incarnate(false)) {
 182                 exit(1);        // can't daemonize
 183         }
 184
 185     // arm signal handlers; code below may generate signals we want to see
 186     if (signal(SIGCHLD, handleSignals) == SIG_ERR
 187                 || signal(SIGINT, handleSignals) == SIG_ERR
 188                 || signal(SIGTERM, handleSignals) == SIG_ERR
 189                 || signal(SIGPIPE, handleSignals) == SIG_ERR
 190 #if !defined(NDEBUG)
 191                 || signal(SIGUSR1, handleSignals) == SIG_ERR
 192 #endif //NDEBUG
 193                 || signal(SIGUSR2, handleSignals) == SIG_ERR) {
 194                 perror("signal");
 195                 exit(1);
 196         }
 197
 198 // The clang static analyzer isn't a big fan of our "object creation hooks object into global pointer graph" model.
 199 // Tell it not to worry.
 200 #ifndef __clang_analyzer__
 201         // introduce all supported ACL subject types
 202         new AnyAclSubject::Maker();
 203         new PasswordAclSubject::Maker();
 204     new ProtectedPasswordAclSubject::Maker();
 205     new PromptedAclSubject::Maker();
 206         new ThresholdAclSubject::Maker();
 207         new CommentAclSubject::Maker();
 208         new ProcessAclSubject::Maker();
 209         new CodeSignatureAclSubject::Maker();
 210         new KeychainPromptAclSubject::Maker(keychainAclDefault);
 211         new PartitionAclSubject::Maker();
 212         new PreAuthorizationAcls::OriginMaker();
 213     new PreAuthorizationAcls::SourceMaker();
 214 #endif
 215     // establish the code equivalents database
 216     CodeSignatures codeSignatures;
 217
 218
 219     // create the main server object and register it
 220         Server server(codeSignatures, bootstrapName);
 221
 222     // Remember the primary service port to send signal events to
 223     gMainServerPort = server.primaryServicePort();
 224
 225     // set server configuration from arguments, if specified
 226         if (workerTimeout)
 227                 server.timeout(workerTimeout);
 228         if (maxThreads)
 229                 server.maxThreads(maxThreads);
 230         server.floatingThread(true);
 231         server.waitForClients(waitForClients);
 232         server.verbosity(verbose);
 233
 234     // create the RootSession object (if -d, give it graphics and tty attributes)
 235     RootSession rootSession(debugMode ? (sessionHasGraphicAccess | sessionHasTTY) : 0, server);
 236
 237         // create a monitor thread to watch for audit session events
 238         AuditMonitor audits(gMainServerPort);
 239         audits.run();
 240
 241     // install MDS (if needed) and initialize the local CSSM
 242     server.loadCssm(mdsIsInstalled);
 243
 244 #ifndef __clang_analyzer__
 245         // create the shared memory notification hub
 246         new SharedMemoryListener(messagingName, kSharedMemoryPoolSize);
 247 #endif
 248
 249
 250         // okay, we're ready to roll
 251     secnotice("SecServer", "Entering service as %s", (char*)bootstrapName);
 252         Syslog::notice("Entering service");
 253
 254         // go
 255         server.run();
 256
 257         // fell out of runloop (should not happen)
 258         Syslog::alert("Aborting");
 259     return 1;
 260 }
 261
 262
 263 //
 264 // Issue usage message and die
 265 //
 266 static void usage(const char *me)
 267 {
 268         fprintf(stderr, "Usage: %s [-dwX]"
 269                 "\n\t[-e equivDatabase]                                         path to code equivalence database"
 270                 "\n\t[-t maxthreads] [-T threadTimeout]     server thread control"
 271                 "\n", me);
 272         exit(2);
 273 }
 274
 275 const CFStringRef kTKSmartCardPreferencesDomain = CFSTR("com.apple.security.smartcard");
 276 const CFStringRef kTKLegacyTokendPreferencesKey  = CFSTR("Legacy");
 277
 278 //
 279 // Handle signals.
 280 // We send ourselves a message (through the "self" service), so actual
 281 // actions happen on the normal event loop path. Note that another thread
 282 // may be picking up the message immediately.
 283 //
 284 static void handleSignals(int sig)
 285 {
 286         (void)self_client_handleSignal(gMainServerPort, mach_task_self(), sig);
 287 }