authd/engine.c

   1 /* Copyright (c) 2012 Apple Inc. All rights reserved. */
   2
   3 #include "engine.h"
   4 #include "rule.h"
   5 #include "authitems.h"
   6 #include "authtoken.h"
   7 #include "agent.h"
   8 #include "process.h"
   9 #include "debugging.h"
  10 #include "server.h"
  11 #include "credential.h"
  12 #include "session.h"
  13 #include "mechanism.h"
  14 #include "authutilities.h"
  15 #include "ccaudit.h"
  16 #include "connection.h"
  17
  18 #include <pwd.h>
  19 #include <Security/checkpw.h>
  20 int checkpw_internal( const struct passwd *pw, const char* password );
  21
  22 #include <Security/AuthorizationTags.h>
  23 #include <Security/AuthorizationTagsPriv.h>
  24 #include <Security/AuthorizationPlugin.h>
  25 #include <sandbox.h>
  26
  27 static void _set_process_hints(auth_items_t, process_t);
  28 static void _set_process_immutable_hints(auth_items_t, process_t);
  29 static void _set_auth_token_hints(auth_items_t, auth_token_t);
  30 static OSStatus _evaluate_user_credential_for_rule(engine_t, credential_t, rule_t, bool, bool, enum Reason *);
  31 static void _engine_set_credential(engine_t, credential_t, bool);
  32 static OSStatus _evaluate_rule(engine_t, rule_t);
  33
  34 enum {
  35     kEngineHintsFlagTemporary = (1 << 30)
  36 };
  37
  38 #pragma mark -
  39 #pragma mark engine creation
  40
  41 struct _engine_s {
  42     __AUTH_BASE_STRUCT_HEADER__;
  43
  44     connection_t conn;
  45     process_t proc;
  46     auth_token_t auth;
  47
  48     AuthorizationFlags flags;
  49     auth_items_t hints;
  50     auth_items_t context;
  51     auth_items_t sticky_context;
  52     auth_items_t immutable_hints;
  53
  54     auth_rights_t grantedRights;
  55
  56     enum Reason reason;
  57     int32_t tries;
  58
  59     CFAbsoluteTime now;
  60
  61     credential_t sessionCredential;
  62     CFMutableSetRef credentials;
  63     CFMutableSetRef effectiveCredentials;
  64
  65     CFMutableDictionaryRef mechanism_agents;
  66
  67     // set only in engine_authorize
  68     const char * currentRightName; // weak ref
  69     rule_t currentRule; // weak ref
  70
  71     rule_t authenticateRule;
  72
  73     bool dismissed;
  74 };
  75
  76 static void
  77 _engine_finalizer(CFTypeRef value)
  78 {
  79     engine_t engine = (engine_t)value;
  80
  81     CFReleaseSafe(engine->mechanism_agents);
  82     CFReleaseSafe(engine->conn);
  83     CFReleaseSafe(engine->auth);
  84     CFReleaseSafe(engine->hints);
  85     CFReleaseSafe(engine->context);
  86     CFReleaseSafe(engine->immutable_hints);
  87     CFReleaseSafe(engine->sticky_context);
  88     CFReleaseSafe(engine->grantedRights);
  89     CFReleaseSafe(engine->sessionCredential);
  90     CFReleaseSafe(engine->credentials);
  91     CFReleaseSafe(engine->effectiveCredentials);
  92     CFReleaseSafe(engine->authenticateRule);
  93 }
  94
  95 AUTH_TYPE_INSTANCE(engine,
  96                    .init = NULL,
  97                    .copy = NULL,
  98                    .finalize = _engine_finalizer,
  99                    .equal = NULL,
 100                    .hash = NULL,
 101                    .copyFormattingDesc = NULL,
 102                    .copyDebugDesc = NULL
 103                    );
 104
 105 static CFTypeID engine_get_type_id() {
 106     static CFTypeID type_id = _kCFRuntimeNotATypeID;
 107     static dispatch_once_t onceToken;
 108
 109     dispatch_once(&onceToken, ^{
 110         type_id = _CFRuntimeRegisterClass(&_auth_type_engine);
 111     });
 112
 113     return type_id;
 114 }
 115
 116 engine_t
 117 engine_create(connection_t conn, auth_token_t auth)
 118 {
 119     engine_t engine = NULL;
 120     require(conn != NULL, done);
 121     require(auth != NULL, done);
 122
 123     engine = (engine_t)_CFRuntimeCreateInstance(kCFAllocatorDefault, engine_get_type_id(), AUTH_CLASS_SIZE(engine), NULL);
 124     require(engine != NULL, done);
 125
 126     engine->conn = (connection_t)CFRetain(conn);
 127     engine->proc = connection_get_process(conn);
 128     engine->auth = (auth_token_t)CFRetain(auth);
 129
 130     engine->hints = auth_items_create();
 131     engine->context = auth_items_create();
 132     engine->immutable_hints = auth_items_create();
 133     engine->sticky_context = auth_items_create();
 134     _set_process_hints(engine->hints, engine->proc);
 135     _set_process_immutable_hints(engine->immutable_hints, engine->proc);
 136     _set_auth_token_hints(engine->hints, auth);
 137
 138     engine->grantedRights = auth_rights_create();
 139
 140     engine->reason = noReason;
 141
 142     engine->now = CFAbsoluteTimeGetCurrent();
 143
 144     session_update(auth_token_get_session(engine->auth));
 145     engine->sessionCredential = credential_create(session_get_uid(auth_token_get_session(engine->auth)));
 146     engine->credentials = CFSetCreateMutable(kCFAllocatorDefault, 0, &kCFTypeSetCallBacks);
 147     engine->effectiveCredentials = CFSetCreateMutable(kCFAllocatorDefault, 0, &kCFTypeSetCallBacks);
 148
 149     session_credentials_iterate(auth_token_get_session(engine->auth), ^bool(credential_t cred) {
 150         CFSetAddValue(engine->effectiveCredentials, cred);
 151         return true;
 152     });
 153
 154     auth_token_credentials_iterate(engine->auth, ^bool(credential_t cred) {
 155         // we added all session credentials already now just add all previously acquired credentials
 156         if (!credential_get_shared(cred)) {
 157             CFSetAddValue(engine->credentials, cred);
 158         }
 159         return true;
 160     });
 161
 162     engine->mechanism_agents = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
 163
 164 done:
 165     return engine;
 166 }
 167
 168 #pragma mark -
 169 #pragma mark agent hints
 170
 171 void
 172 _set_process_hints(auth_items_t hints, process_t proc)
 173 {
 174     // process information
 175     RequestorType type = bundle;
 176     auth_items_set_data(hints, AGENT_HINT_CLIENT_TYPE, &type, sizeof(type));
 177     auth_items_set_int(hints, AGENT_HINT_CLIENT_PID, process_get_pid(proc));
 178     auth_items_set_uint(hints, AGENT_HINT_CLIENT_UID, process_get_uid(proc));
 179 }
 180
 181 void
 182 _set_process_immutable_hints(auth_items_t immutable_hints, process_t proc)
 183 {
 184     // process information - immutable
 185     auth_items_set_bool(immutable_hints, AGENT_HINT_PROCESS_SIGNED, process_apple_signed(proc));
 186 }
 187
 188 void
 189 _set_auth_token_hints(auth_items_t hints, auth_token_t auth)
 190 {
 191     auth_items_set_string(hints, AGENT_HINT_CLIENT_PATH, auth_token_get_code_url(auth));
 192     auth_items_set_int(hints, AGENT_HINT_CREATOR_PID, auth_token_get_pid(auth));
 193     const audit_info_s * info = auth_token_get_audit_info(auth);
 194     auth_items_set_data(hints, AGENT_HINT_CREATOR_AUDIT_TOKEN, &info->opaqueToken, sizeof(info->opaqueToken));
 195 }
 196
 197 static void
 198 _set_right_hints(auth_items_t hints, const char * right)
 199 {
 200    auth_items_set_string(hints, AGENT_HINT_AUTHORIZE_RIGHT, right);
 201 }
 202
 203 static void
 204 _set_rule_hints(auth_items_t hints, rule_t rule)
 205 {
 206     auth_items_set_string(hints, AGENT_HINT_AUTHORIZE_RULE, rule_get_name(rule));
 207     const char * group = rule_get_group(rule);
 208     if (rule_get_class(rule) == RC_USER && group != NULL) {
 209         auth_items_set_string(hints, AGENT_HINT_REQUIRE_USER_IN_GROUP, group);
 210     } else {
 211         auth_items_remove(hints, AGENT_HINT_REQUIRE_USER_IN_GROUP);
 212     }
 213 }
 214
 215 static void
 216 _set_localization_hints(authdb_connection_t dbconn, auth_items_t hints, rule_t rule)
 217 {
 218     char * key = calloc(1u, 128);
 219
 220     authdb_step(dbconn, "SELECT lang,value FROM prompts WHERE r_id = ?", ^(sqlite3_stmt *stmt) {
 221         sqlite3_bind_int64(stmt, 1, rule_get_id(rule));
 222     }, ^bool(auth_items_t data) {
 223         snprintf(key, 128, "%s%s", kAuthorizationRuleParameterDescription, auth_items_get_string(data, "lang"));
 224         auth_items_set_string(hints, key, auth_items_get_string(data, "value"));
 225         auth_items_set_flags(hints, key, kEngineHintsFlagTemporary);
 226         return true;
 227     });
 228
 229     authdb_step(dbconn, "SELECT lang,value FROM buttons WHERE r_id = ?", ^(sqlite3_stmt *stmt) {
 230         sqlite3_bind_int64(stmt, 1, rule_get_id(rule));
 231     }, ^bool(auth_items_t data) {
 232         snprintf(key, 128, "%s%s", kAuthorizationRuleParameterButton, auth_items_get_string(data, "lang"));
 233         auth_items_set_string(hints, key, auth_items_get_string(data, "value"));
 234         auth_items_set_flags(hints, key, kEngineHintsFlagTemporary);
 235         return true;
 236     });
 237
 238     free_safe(key);
 239 }
 240
 241 static void
 242 _set_session_hints(engine_t engine, rule_t rule)
 243 {
 244     LOGV("engine[%i]: ** prepare agent hints for rule %s", connection_get_pid(engine->conn), rule_get_name(rule));
 245     if (_evaluate_user_credential_for_rule(engine, engine->sessionCredential, rule, true, true, NULL) == errAuthorizationSuccess) {
 246         const char * tmp = credential_get_name(engine->sessionCredential);
 247         if (tmp != NULL) {
 248             auth_items_set_string(engine->hints, AGENT_HINT_SUGGESTED_USER, tmp);
 249         }
 250         tmp = credential_get_realname(engine->sessionCredential);
 251         if (tmp != NULL) {
 252             auth_items_set_string(engine->hints, AGENT_HINT_SUGGESTED_USER_LONG, tmp);
 253         }
 254     } else {
 255         auth_items_remove(engine->hints, AGENT_HINT_SUGGESTED_USER);
 256         auth_items_remove(engine->hints, AGENT_HINT_SUGGESTED_USER_LONG);
 257     }
 258 }
 259
 260 #pragma mark -
 261 #pragma mark right processing
 262
 263 static OSStatus
 264 _evaluate_credential_for_rule(engine_t engine, credential_t cred, rule_t rule, bool ignoreShared, bool sessionOwner, enum Reason * reason)
 265 {
 266     if (auth_token_least_privileged(engine->auth)) {
 267         if (credential_is_right(cred) && credential_get_valid(cred) && _compare_string(engine->currentRightName, credential_get_name(cred))) {
 268             if (!ignoreShared) {
 269                 if (!rule_get_shared(rule) && credential_get_shared(cred)) {
 270                     LOGV("engine[%i]: - shared right %s (does NOT satisfy rule)", connection_get_pid(engine->conn), credential_get_name(cred));
 271                     if (reason) {  *reason = unknownReason; }
 272                     return errAuthorizationDenied;
 273                 }
 274             }
 275
 276             return errAuthorizationSuccess;
 277         } else {
 278             if (reason) {  *reason = unknownReason; }
 279             return errAuthorizationDenied;
 280         }
 281     } else {
 282         return _evaluate_user_credential_for_rule(engine,cred,rule,ignoreShared,sessionOwner, reason);
 283     }
 284 }
 285
 286 static OSStatus
 287 _evaluate_user_credential_for_rule(engine_t engine, credential_t cred, rule_t rule, bool ignoreShared, bool sessionOwner, enum Reason * reason)
 288 {
 289     const char * cred_label = sessionOwner ? "session owner" : "credential";
 290     LOGV("engine[%i]: - validating %s%s %s (%i) for %s", connection_get_pid(engine->conn),
 291          credential_get_shared(cred) ? "shared " : "",
 292          cred_label,
 293          credential_get_name(cred),
 294          credential_get_uid(cred),
 295          rule_get_name(rule));
 296
 297     if (rule_get_class(rule) != RC_USER) {
 298         LOGV("engine[%i]: - invalid rule class %i (denied)", connection_get_pid(engine->conn), rule_get_class(rule));
 299         return errAuthorizationDenied;
 300     }
 301
 302     if (credential_get_valid(cred) != true) {
 303         LOGV("engine[%i]: - %s %i invalid (does NOT satisfy rule)", connection_get_pid(engine->conn), cred_label, credential_get_uid(cred));
 304         if (reason) {  *reason = invalidPassphrase; }
 305         return errAuthorizationDenied;
 306     }
 307
 308     if (engine->now - credential_get_creation_time(cred) > rule_get_timeout(rule)) {
 309         LOGV("engine[%i]: - %s %i expired '%f > %lli' (does NOT satisfy rule)", connection_get_pid(engine->conn), cred_label, credential_get_uid(cred),
 310              (engine->now - credential_get_creation_time(cred)), rule_get_timeout(rule));
 311         if (reason) {  *reason = unknownReason; }
 312         return errAuthorizationDenied;
 313     }
 314
 315
 316     if (!ignoreShared) {
 317         if (!rule_get_shared(rule) && credential_get_shared(cred)) {
 318             LOGV("engine[%i]: - shared %s %i (does NOT satisfy rule)", connection_get_pid(engine->conn), cred_label, credential_get_uid(cred));
 319             if (reason) {  *reason = unknownReason; }
 320             return errAuthorizationDenied;
 321         }
 322     }
 323
 324     if (credential_get_uid(cred) == 0) {
 325         LOGV("engine[%i]: - %s %i has uid 0 (does satisfy rule)", connection_get_pid(engine->conn), cred_label, credential_get_uid(cred));
 326         return errAuthorizationSuccess;
 327     }
 328
 329     if (rule_get_session_owner(rule)) {
 330         if (credential_get_uid(cred) == session_get_uid(auth_token_get_session(engine->auth))) {
 331             LOGV("engine[%i]: - %s %i is session owner (does satisfy rule)", connection_get_pid(engine->conn), cred_label, credential_get_uid(cred));
 332             return errAuthorizationSuccess;
 333         }
 334     }
 335
 336     if (rule_get_group(rule) != NULL) {
 337         do
 338         {
 339             // This allows testing a group modifier without prompting the user
 340             // When (authenticate-user = false) we are just testing the creator uid.
 341             // If a group modifier is enabled (RuleFlagEntitledAndGroup | RuleFlagVPNEntitledAndGroup)
 342             // we want to skip the creator uid group check.
 343             // group modifiers are checked early during the evaluation in _check_entitlement_for_rule
 344             if (!rule_get_authenticate_user(rule)) {
 345                 if (rule_check_flags(rule, RuleFlagEntitledAndGroup | RuleFlagVPNEntitledAndGroup)) {
 346                     break;
 347                 }
 348             }
 349
 350             if (credential_check_membership(cred, rule_get_group(rule))) {
 351                 LOGV("engine[%i]: - %s %i is member of group %s (does satisfy rule)", connection_get_pid(engine->conn), cred_label, credential_get_uid(cred), rule_get_group(rule));
 352                 return errAuthorizationSuccess;
 353             } else {
 354                 if (reason) {  *reason = userNotInGroup; }
 355             }
 356         } while (0);
 357     } else if (rule_get_session_owner(rule)) { // rule asks only if user is the session owner
 358         if (reason) {  *reason = unacceptableUser; }
 359     }
 360
 361     LOGV("engine[%i]: - %s %i (does NOT satisfy rule)", connection_get_pid(engine->conn), cred_label, credential_get_uid(cred));
 362     return errAuthorizationDenied;
 363 }
 364
 365 static agent_t
 366 _get_agent(engine_t engine, mechanism_t mech, bool create, bool firstMech)
 367 {
 368     agent_t agent = (agent_t)CFDictionaryGetValue(engine->mechanism_agents, mech);
 369     if (create && !agent) {
 370         agent = agent_create(engine, mech, engine->auth, engine->proc, firstMech);
 371         if (agent) {
 372             CFDictionaryAddValue(engine->mechanism_agents, mech, agent);
 373             CFReleaseSafe(agent);
 374         }
 375     }
 376     return agent;
 377 }
 378
 379 static uint64_t
 380 _evaluate_builtin_mechanism(engine_t engine, mechanism_t mech)
 381 {
 382     uint64_t result = kAuthorizationResultDeny;
 383
 384     switch (mechanism_get_type(mech)) {
 385         case kMechanismTypeEntitled:
 386             if (auth_token_has_entitlement_for_right(engine->auth, engine->currentRightName)) {
 387                 result = kAuthorizationResultAllow;
 388             }
 389         break;
 390         default:
 391             break;
 392     }
 393
 394     return result;
 395 }
 396
 397
 398 static OSStatus
 399 _evaluate_mechanisms(engine_t engine, CFArrayRef mechanisms)
 400 {
 401     uint64_t result = kAuthorizationResultAllow;
 402     ccaudit_t ccaudit = ccaudit_create(engine->proc, engine->auth, AUE_ssauthmech);
 403     auth_items_t context = auth_items_create();
 404     auth_items_t hints = auth_items_create();
 405
 406     auth_items_copy(context, engine->context);
 407     auth_items_copy(hints, engine->hints);
 408     auth_items_copy(context, engine->sticky_context);
 409
 410     CFIndex count = CFArrayGetCount(mechanisms);
 411     for (CFIndex i = 0; i < count; i++) {
 412         mechanism_t mech = (mechanism_t)CFArrayGetValueAtIndex(mechanisms, i);
 413
 414         if (mechanism_get_type(mech)) {
 415             LOGV("engine[%i]: running builtin mechanism %s (%li of %li)", connection_get_pid(engine->conn), mechanism_get_string(mech), i+1, count);
 416             result = _evaluate_builtin_mechanism(engine, mech);
 417         } else {
 418             agent_t agent = _get_agent(engine, mech, true, i == 0);
 419             require_action(agent != NULL, done, result = kAuthorizationResultUndefined; LOGE("engine[%i]: error creating mechanism agent", connection_get_pid(engine->conn)));
 420             LOGV("engine[%i]: running mechanism %s (%li of %li)", connection_get_pid(engine->conn), mechanism_get_string(agent_get_mechanism(agent)), i+1, count);
 421             result = agent_run(agent, hints, context, engine->immutable_hints);
 422
 423             auth_items_copy(context, agent_get_context(agent));
 424             auth_items_copy(hints, agent_get_hints(agent));
 425
 426             bool interrupted = false;
 427             for (CFIndex i2 = 0; i2 != i; i2++) {
 428                 agent_t agent2 = _get_agent(engine, (mechanism_t)CFArrayGetValueAtIndex(mechanisms, i2), false, i == 0);
 429                 if (agent_get_state(agent2) == interrupting) {
 430                     agent_deactivate(agent);
 431                     interrupted = true;
 432                     i = i2 - 1;
 433                     char * buf = NULL;
 434                     asprintf(&buf, "evaluation interrupted by %s; restarting evaluation there", mechanism_get_string(agent_get_mechanism(agent2)));
 435                     ccaudit_log_mechanism(ccaudit, engine->currentRightName, mechanism_get_string(agent_get_mechanism(agent2)), kAuthorizationResultAllow, buf);
 436                     free_safe(buf);
 437                     auth_items_copy(context, agent_get_context(agent2));
 438                     auth_items_copy(hints, agent_get_hints(agent2));
 439                     break;
 440                 }
 441             }
 442
 443             // Empty token name means that token doesn't exist (e.g. SC was removed).
 444             // Remove empty token name from hints for UI drawing logic.
 445             const char * token_name = auth_items_get_string(hints, AGENT_HINT_TOKEN_NAME);
 446             if (token_name && strlen(token_name) == 0) {
 447                 auth_items_remove(hints, AGENT_HINT_TOKEN_NAME);
 448             }
 449
 450             if (interrupted) {
 451                 LOGV("engine[%i]: mechanisms interrupted", connection_get_pid(engine->conn));
 452                 enum Reason reason = worldChanged;
 453                 auth_items_set_data(hints, AGENT_HINT_RETRY_REASON, &reason, sizeof(reason));
 454                 result = kAuthorizationResultAllow;
 455                 _cf_dictionary_iterate(engine->mechanism_agents, ^bool(CFTypeRef key __attribute__((__unused__)), CFTypeRef value) {
 456                     agent_t tempagent = (agent_t)value;
 457                     agent_clear_interrupt(tempagent);
 458                     return true;
 459                 });
 460             }
 461         }
 462
 463         if (result == kAuthorizationResultAllow) {
 464             ccaudit_log_mechanism(ccaudit, engine->currentRightName, mechanism_get_string(mech), kAuthorizationResultAllow, NULL);
 465         } else {
 466             ccaudit_log_mechanism(ccaudit, engine->currentRightName, mechanism_get_string(mech), (uint32_t)result, NULL);
 467             break;
 468         }
 469     }
 470
 471 done:
 472     if ((result == kAuthorizationResultUserCanceled) || (result == kAuthorizationResultAllow)) {
 473         // only make non-sticky context values available externally
 474         auth_items_set_flags(context, kAuthorizationEnvironmentPassword, kAuthorizationContextFlagVolatile);
 475         auth_items_copy_with_flags(engine->context, context, kAuthorizationContextFlagExtractable | kAuthorizationContextFlagVolatile);
 476     } else if (result == kAuthorizationResultDeny) {
 477         auth_items_clear(engine->sticky_context);
 478         // save off sticky values in context
 479         auth_items_copy_with_flags(engine->sticky_context, context, kAuthorizationContextFlagSticky);
 480     }
 481
 482     CFReleaseSafe(ccaudit);
 483     CFReleaseSafe(context);
 484     CFReleaseSafe(hints);
 485
 486     switch(result)
 487     {
 488         case kAuthorizationResultDeny:
 489             return errAuthorizationDenied;
 490         case kAuthorizationResultUserCanceled:
 491             return errAuthorizationCanceled;
 492         case kAuthorizationResultAllow:
 493             return errAuthorizationSuccess;
 494         case kAuthorizationResultUndefined:
 495             return errAuthorizationInternal;
 496         default:
 497         {
 498             LOGV("engine[%i]: unexpected error result", connection_get_pid(engine->conn));
 499             return errAuthorizationInternal;
 500         }
 501     }
 502 }
 503
 504 static OSStatus
 505 _evaluate_authentication(engine_t engine, rule_t rule)
 506 {
 507     OSStatus status = errAuthorizationDenied;
 508     ccaudit_t ccaudit = ccaudit_create(engine->proc, engine->auth, AUE_ssauthint);
 509     LOGV("engine[%i]: evaluate authentication", connection_get_pid(engine->conn));
 510     _set_rule_hints(engine->hints, rule);
 511     _set_session_hints(engine, rule);
 512
 513     CFArrayRef mechanisms = rule_get_mechanisms(rule);
 514     if (!(CFArrayGetCount(mechanisms) > 0)) {
 515         mechanisms = rule_get_mechanisms(engine->authenticateRule);
 516     }
 517     require_action(CFArrayGetCount(mechanisms) > 0, done, LOGV("engine[%i]: error no mechanisms found", connection_get_pid(engine->conn)));
 518
 519     int64_t ruleTries = rule_get_tries(rule);
 520     for (engine->tries = 0; engine->tries < ruleTries; engine->tries++) {
 521
 522         auth_items_set_data(engine->hints, AGENT_HINT_RETRY_REASON, &engine->reason, sizeof(engine->reason));
 523         auth_items_set_int(engine->hints, AGENT_HINT_TRIES, engine->tries);
 524
 525         status = _evaluate_mechanisms(engine, mechanisms);
 526
 527         LOGV("engine[%i]: evaluate mechanisms result %i", connection_get_pid(engine->conn), status);
 528
 529         // successfully ran mechanisms to obtain credential
 530         if (status == errAuthorizationSuccess) {
 531             // deny is the default
 532             status = errAuthorizationDenied;
 533
 534             credential_t newCred = NULL;
 535             if (auth_items_exist(engine->context, "uid")) {
 536                 newCred = credential_create(auth_items_get_uint(engine->context, "uid"));
 537             } else {
 538                 LOGV("engine[%i]: mechanism failed to return a valid uid", connection_get_pid(engine->conn));
 539             }
 540
 541             if (newCred) {
 542                 if (credential_get_valid(newCred)) {
 543                     LOG("UID %u authenticated as user %s (UID %u) for right '%s'", auth_token_get_uid(engine->auth), credential_get_name(newCred), credential_get_uid(newCred), engine->currentRightName);
 544                     ccaudit_log_success(ccaudit, newCred, engine->currentRightName);
 545                 } else {
 546                     LOG("UID %u failed to authenticate as user '%s' for right '%s'", auth_token_get_uid(engine->auth), auth_items_get_string(engine->context, "username"), engine->currentRightName);
 547                     ccaudit_log_failure(ccaudit, auth_items_get_string(engine->context, "username"), engine->currentRightName);
 548                 }
 549
 550                 status = _evaluate_user_credential_for_rule(engine, newCred, rule, true, false, &engine->reason);
 551
 552                 if (status == errAuthorizationSuccess) {
 553                     _engine_set_credential(engine, newCred, rule_get_shared(rule));
 554                     CFReleaseSafe(newCred);
 555
 556                     if (auth_token_least_privileged(engine->auth)) {
 557                         credential_t rightCred = credential_create_with_right(engine->currentRightName);
 558                         _engine_set_credential(engine, rightCred, rule_get_shared(rule));
 559                         CFReleaseSafe(rightCred);
 560                     }
 561
 562                     session_t session = auth_token_get_session(engine->auth);
 563                     if (credential_get_uid(newCred) == session_get_uid(session)) {
 564                         LOGV("engine[%i]: authenticated as the session owner", connection_get_pid(engine->conn));
 565                         session_set_attributes(auth_token_get_session(engine->auth), AU_SESSION_FLAG_HAS_AUTHENTICATED);
 566                     }
 567
 568                     break;
 569                 }
 570
 571                 CFReleaseSafe(newCred);
 572             }
 573
 574         } else if (status == errAuthorizationCanceled || status == errAuthorizationInternal) {
 575             break;
 576         } else if (status == errAuthorizationDenied) {
 577             engine->reason = invalidPassphrase;
 578         }
 579     }
 580
 581     if (engine->tries == ruleTries) {
 582         engine->reason = tooManyTries;
 583         auth_items_set_data(engine->hints, AGENT_HINT_RETRY_REASON, &engine->reason, sizeof(engine->reason));
 584         auth_items_set_int(engine->hints, AGENT_HINT_TRIES, engine->tries);
 585         _evaluate_mechanisms(engine, mechanisms);
 586         ccaudit_log(ccaudit, engine->currentRightName, NULL, 1113);
 587     }
 588
 589 done:
 590     CFReleaseSafe(ccaudit);
 591
 592     return status;
 593 }
 594
 595 static bool
 596 _check_entitlement_for_rule(engine_t engine, rule_t rule)
 597 {
 598     bool entitled = false;
 599     CFTypeRef value = NULL;
 600
 601     if (rule_check_flags(rule, RuleFlagEntitledAndGroup)) {
 602         if (auth_token_has_entitlement_for_right(engine->auth, engine->currentRightName)) {
 603             if (credential_check_membership(auth_token_get_credential(engine->auth), rule_get_group(rule))) {
 604                 LOGV("engine[%i]: creator of authorization has entitlement for right %s and is member of group '%s'", connection_get_pid(engine->conn), engine->currentRightName, rule_get_group(rule));
 605                 entitled = true;
 606                 goto done;
 607             }
 608         }
 609     }
 610
 611     if (rule_check_flags(rule, RuleFlagVPNEntitledAndGroup)) {
 612         // com.apple.networking.vpn.configuration is an array we only check for it's existence
 613         value = auth_token_copy_entitlement_value(engine->auth, "com.apple.networking.vpn.configuration");
 614         if (value) {
 615             if (credential_check_membership(auth_token_get_credential(engine->auth), rule_get_group(rule))) {
 616                 LOGV("engine[%i]: creator of authorization has VPN entitlement and is member of group '%s'", connection_get_pid(engine->conn), rule_get_group(rule));
 617                 entitled = true;
 618                 goto done;
 619             }
 620         }
 621     }
 622
 623 done:
 624     CFReleaseSafe(value);
 625     return entitled;
 626 }
 627
 628 static OSStatus
 629 _evaluate_class_user(engine_t engine, rule_t rule)
 630 {
 631     __block OSStatus status = errAuthorizationDenied;
 632
 633     if (_check_entitlement_for_rule(engine,rule)) {
 634         return errAuthorizationSuccess;
 635     }
 636
 637     if (rule_get_allow_root(rule) && auth_token_get_uid(engine->auth) == 0) {
 638         LOGV("engine[%i]: creator of authorization has uid == 0 granting right %s", connection_get_pid(engine->conn), engine->currentRightName);
 639         return errAuthorizationSuccess;
 640     }
 641
 642     if (!rule_get_authenticate_user(rule)) {
 643         status = _evaluate_user_credential_for_rule(engine, engine->sessionCredential, rule, true, true, NULL);
 644
 645         if (status == errAuthorizationSuccess) {
 646             return errAuthorizationSuccess;
 647         }
 648
 649         return errAuthorizationDenied;
 650     }
 651
 652     // First -- check all the credentials we have either acquired or currently have
 653     _cf_set_iterate(engine->credentials, ^bool(CFTypeRef value) {
 654         credential_t cred = (credential_t)value;
 655         // Passed-in user credentials are allowed for least-privileged mode
 656         if (auth_token_least_privileged(engine->auth) && !credential_is_right(cred) && credential_get_valid(cred)) {
 657             status = _evaluate_user_credential_for_rule(engine, cred, rule, false, false, NULL);
 658             if (errAuthorizationSuccess == status) {
 659                 credential_t rightCred = credential_create_with_right(engine->currentRightName);
 660                 _engine_set_credential(engine,rightCred,rule_get_shared(rule));
 661                 CFReleaseSafe(rightCred);
 662                 return false; // exit loop
 663             }
 664         }
 665
 666         status = _evaluate_credential_for_rule(engine, cred, rule, false, false, NULL);
 667         if (status == errAuthorizationSuccess) {
 668             return false; // exit loop
 669         }
 670         return true;
 671     });
 672
 673     if (status == errAuthorizationSuccess) {
 674         return status;
 675     }
 676
 677     // Second -- go through the credentials associated to the authorization token session/auth token
 678     _cf_set_iterate(engine->effectiveCredentials, ^bool(CFTypeRef value) {
 679         credential_t cred = (credential_t)value;
 680         status = _evaluate_credential_for_rule(engine, cred, rule, false, false, NULL);
 681         if (status == errAuthorizationSuccess) {
 682             // Add the credential we used to the output set.
 683             _engine_set_credential(engine, cred, false);
 684             return false; // exit loop
 685         }
 686         return true;
 687     });
 688
 689     if (status == errAuthorizationSuccess) {
 690         return status;
 691     }
 692
 693     // Finally - we didn't find a credential. Obtain a new credential if our flags let us do so.
 694     if (!(engine->flags & kAuthorizationFlagExtendRights)) {
 695         LOGV("engine[%i]: authorization denied (kAuthorizationFlagExtendRights not set)", connection_get_pid(engine->conn));
 696         return errAuthorizationDenied;
 697     }
 698
 699     // authorization that timeout immediately cannot be preauthorized
 700     if (engine->flags & kAuthorizationFlagPreAuthorize && rule_get_timeout(rule) == 0) {
 701         return errAuthorizationSuccess;
 702     }
 703
 704     if (!(engine->flags & kAuthorizationFlagInteractionAllowed)) {
 705                 LOGV("engine[%i]: Interaction not allowed (kAuthorizationFlagInteractionAllowed not set)", connection_get_pid(engine->conn));
 706         return errAuthorizationInteractionNotAllowed;
 707     }
 708
 709     if (!(session_get_attributes(auth_token_get_session(engine->auth)) & AU_SESSION_FLAG_HAS_GRAPHIC_ACCESS)) {
 710         LOGV("engine[%i]: Interaction not allowed (session has no ui access)", connection_get_pid(engine->conn));
 711         return errAuthorizationInteractionNotAllowed;
 712     }
 713
 714     if (server_in_dark_wake()) {
 715         LOGV("engine[%i]: authorization denied (in DarkWake)", connection_get_pid(engine->conn));
 716         return errAuthorizationDenied;
 717     }
 718
 719     return _evaluate_authentication(engine,rule);
 720 }
 721
 722 static OSStatus
 723 _evaluate_class_rule(engine_t engine, rule_t rule)
 724 {
 725     __block OSStatus status = errAuthorizationDenied;
 726     int64_t kofn = rule_get_kofn(rule);
 727
 728     uint32_t total = (uint32_t)rule_get_delegates_count(rule);
 729     __block uint32_t success_count = 0;
 730     __block uint32_t count = 0;
 731     LOGV("engine[%i]: ** rule %s has %zi delegates kofn = %lli", connection_get_pid(engine->conn), rule_get_name(rule), total, kofn);
 732     rule_delegates_iterator(rule, ^bool(rule_t delegate) {
 733         count++;
 734
 735         if (kofn != 0 && success_count == kofn) {
 736             status = errAuthorizationSuccess;
 737             return false;
 738         }
 739
 740         LOGV("engine[%i]: * evaluate rule %s (%i)", connection_get_pid(engine->conn), rule_get_name(delegate), count);
 741         status = _evaluate_rule(engine, delegate);
 742
 743         // if status is cancel/internal error abort
 744                 if ((status == errAuthorizationCanceled) || (status == errAuthorizationInternal))
 745                         return false;
 746
 747         if (status != errAuthorizationSuccess) {
 748             if (kofn != 0) {
 749                 // if remaining is less then required abort
 750                 if ((total - count) < (kofn - success_count)) {
 751                     LOGD("engine[%i]: rule evaluation remaining: %i, required: %lli", connection_get_pid(engine->conn), (total - count), (kofn - success_count));
 752                     return false;
 753                 }
 754                 return true;
 755             }
 756             return false;
 757         } else {
 758             success_count++;
 759             return true;
 760         }
 761     });
 762
 763     return status;
 764 }
 765
 766 static OSStatus
 767 _evaluate_class_mechanism(engine_t engine, rule_t rule)
 768 {
 769     OSStatus status = errAuthorizationDenied;
 770     CFArrayRef mechanisms = NULL;
 771
 772     require_action(rule_get_mechanisms_count(rule) > 0, done, status = errAuthorizationSuccess; LOGV("engine[%i]: no mechanisms specified", connection_get_pid(engine->conn)));
 773
 774     mechanisms = rule_get_mechanisms(rule);
 775
 776     if (server_in_dark_wake()) {
 777         CFIndex count = CFArrayGetCount(mechanisms);
 778         for (CFIndex i = 0; i < count; i++) {
 779             if (!mechanism_is_privileged((mechanism_t)CFArrayGetValueAtIndex(mechanisms, i))) {
 780                 LOGV("engine[%i]: authorization denied (in DarkWake)", connection_get_pid(engine->conn));
 781                 goto done;
 782             }
 783         }
 784     }
 785
 786     int64_t ruleTries = rule_get_tries(rule);
 787     engine->tries = 0;
 788     do {
 789         auth_items_set_data(engine->hints, AGENT_HINT_RETRY_REASON, &engine->reason, sizeof(engine->reason));
 790         auth_items_set_int(engine->hints, AGENT_HINT_TRIES, engine->tries);
 791
 792         status = _evaluate_mechanisms(engine, mechanisms);
 793         LOGV("engine[%i]: evaluate mechanisms result %i", connection_get_pid(engine->conn), status);
 794
 795         if ((status == errAuthorizationSuccess) || (status == errAuthorizationCanceled)) {
 796
 797             if (status == errAuthorizationSuccess) {
 798                 credential_t newCred = NULL;
 799                 if (auth_items_exist(engine->context, "uid")) {
 800                     newCred = credential_create(auth_items_get_uint(engine->context, "uid"));
 801                 } else {
 802                     LOGV("engine[%i]: mechanism did not return a uid", connection_get_pid(engine->conn));
 803                 }
 804
 805                 if (newCred) {
 806                     _engine_set_credential(engine, newCred, rule_get_shared(rule));
 807
 808                     if (auth_token_least_privileged(engine->auth)) {
 809                         credential_t rightCred = credential_create_with_right(engine->currentRightName);
 810                         _engine_set_credential(engine, rightCred, rule_get_shared(rule));
 811                         CFReleaseSafe(rightCred);
 812                     }
 813
 814                     if (strcmp(engine->currentRightName, "system.login.console") == 0 && !auth_items_exist(engine->context, AGENT_CONTEXT_AUTO_LOGIN)) {
 815                         session_set_attributes(auth_token_get_session(engine->auth), AU_SESSION_FLAG_HAS_AUTHENTICATED);
 816                     }
 817
 818                     CFReleaseSafe(newCred);
 819                 }
 820             }
 821         } // mechanism errAuthorizationSuccess
 822
 823         engine->tries++;
 824
 825     } while ( (status == errAuthorizationDenied) // only if we have an expected faulure we continue
 826              && ((ruleTries == 0) || ((ruleTries > 0) && engine->tries < ruleTries))); // ruleTries == 0 means we try forever
 827                                                                                        // ruleTires > 0 means we try upto ruleTries times
 828 done:
 829     return status;
 830 }
 831
 832 static OSStatus
 833 _evaluate_rule(engine_t engine, rule_t rule)
 834 {
 835     if (rule_check_flags(rule, RuleFlagEntitled)) {
 836         if (auth_token_has_entitlement_for_right(engine->auth, engine->currentRightName)) {
 837             LOGV("engine[%i]: rule allow, creator of authorization has entitlement for right %s", connection_get_pid(engine->conn), engine->currentRightName);
 838             return errAuthorizationSuccess;
 839         }
 840     }
 841
 842     if (rule_check_flags(rule, RuleFlagRequireAppleSigned)) {
 843         if (!auth_token_apple_signed(engine->auth)) {
 844             LOGV("engine[%i]: rule deny, creator of authorization is not signed by apple", connection_get_pid(engine->conn));
 845             return errAuthorizationDenied;
 846         }
 847     }
 848
 849     switch (rule_get_class(rule)) {
 850         case RC_ALLOW:
 851             LOGV("engine[%i]: rule set to allow", connection_get_pid(engine->conn));
 852             return errAuthorizationSuccess;
 853         case RC_DENY:
 854             LOGV("engine[%i]: rule set to deny", connection_get_pid(engine->conn));
 855             return errAuthorizationDenied;
 856         case RC_USER:
 857             return _evaluate_class_user(engine,rule);
 858         case RC_RULE:
 859             return _evaluate_class_rule(engine, rule);
 860         case RC_MECHANISM:
 861             return _evaluate_class_mechanism(engine, rule);
 862         default:
 863             LOGV("engine[%i]: invalid class for rule or rule not found", connection_get_pid(engine->conn));
 864             return errAuthorizationInternal;
 865     }
 866 }
 867
 868 static rule_t
 869 _find_rule(engine_t engine, authdb_connection_t dbconn, const char * string)
 870 {
 871     rule_t r = NULL;
 872     size_t sLen = strlen(string);
 873
 874     char * buf = calloc(1u, sLen + 1);
 875     strlcpy(buf, string, sLen + 1);
 876     char * ptr = buf + sLen;
 877     __block int64_t count = 0;
 878
 879     for (;;) {
 880
 881         // lookup rule
 882         authdb_step(dbconn, "SELECT COUNT(name) AS cnt FROM rules WHERE name = ? AND type = 1",
 883         ^(sqlite3_stmt *stmt) {
 884             sqlite3_bind_text(stmt, 1, buf, -1, NULL);
 885         }, ^bool(auth_items_t data) {
 886             count = auth_items_get_int64(data, "cnt");
 887             return false;
 888         });
 889
 890         if (count > 0) {
 891             r = rule_create_with_string(buf, dbconn);
 892             goto done;
 893         }
 894
 895         // if buf ends with a . and we didn't find a rule remove .
 896         if (*ptr == '.') {
 897             *ptr = '\0';
 898         }
 899         // find any remaining . and truncate the string
 900         ptr = strrchr(buf, '.');
 901         if (ptr) {
 902             *(ptr+1) = '\0';
 903         } else {
 904             break;
 905         }
 906     }
 907
 908 done:
 909     free_safe(buf);
 910
 911     // set default if we didn't find a rule
 912     if (r == NULL) {
 913         r = rule_create_with_string("", dbconn);
 914         if (rule_get_id(r) == 0) {
 915             CFReleaseNull(r);
 916             LOGE("engine[%i]: default rule lookup error (missing), using builtin defaults", connection_get_pid(engine->conn));
 917             r = rule_create_default();
 918         }
 919     }
 920     return r;
 921 }
 922
 923 static void _parse_enviroment(engine_t engine, auth_items_t enviroment)
 924 {
 925     require(enviroment != NULL, done);
 926
 927 #if DEBUG
 928     LOGV("engine[%i]: Dumping Enviroment", connection_get_pid(engine->conn));
 929     _show_cf(enviroment);
 930 #endif
 931
 932     // Check if a credential was passed into the environment and we were asked to extend the rights
 933     if (engine->flags & kAuthorizationFlagExtendRights) {
 934         const char * user = auth_items_get_string(enviroment, kAuthorizationEnvironmentUsername);
 935         const char * pass = auth_items_get_string(enviroment, kAuthorizationEnvironmentPassword);
 936         bool shared = auth_items_exist(enviroment, kAuthorizationEnvironmentShared);
 937         require(user != NULL, done);
 938
 939         struct passwd *pw = getpwnam(user);
 940         require_action(pw != NULL, done, LOGE("engine[%i]: user not found %s", connection_get_pid(engine->conn), user));
 941
 942         int checkpw_status = checkpw_internal(pw, pass ? pass : "");
 943         require_action(checkpw_status == CHECKPW_SUCCESS, done, LOGE("engine[%i]: checkpw() returned %d; failed to authenticate user %s (uid %u).", connection_get_pid(engine->conn), checkpw_status, pw->pw_name, pw->pw_uid));
 944
 945         credential_t cred = credential_create(pw->pw_uid);
 946         if (credential_get_valid(cred)) {
 947             LOG("engine[%i]: checkpw() succeeded, creating credential for user %s", connection_get_pid(engine->conn), user);
 948             _engine_set_credential(engine, cred, shared);
 949
 950             auth_items_set_string(engine->context, kAuthorizationEnvironmentUsername, user);
 951             auth_items_set_string(engine->context, kAuthorizationEnvironmentPassword, pass ? pass : "");
 952         }
 953         CFReleaseSafe(cred);
 954     }
 955
 956 done:
 957     endpwent();
 958     return;
 959 }
 960
 961 static bool _verify_sandbox(engine_t engine, const char * right)
 962 {
 963     pid_t pid = process_get_pid(engine->proc);
 964     if (sandbox_check(pid, "authorization-right-obtain", SANDBOX_FILTER_RIGHT_NAME, right)) {
 965         LOGE("Sandbox denied authorizing right '%s' by client '%s' [%d]", right, process_get_code_url(engine->proc), pid);
 966         return false;
 967     }
 968
 969     pid = auth_token_get_pid(engine->auth);
 970     if (auth_token_get_sandboxed(engine->auth) && sandbox_check(pid, "authorization-right-obtain", SANDBOX_FILTER_RIGHT_NAME, right)) {
 971         LOGE("Sandbox denied authorizing right '%s' for authorization created by '%s' [%d]", right, auth_token_get_code_url(engine->auth), pid);
 972         return false;
 973     }
 974
 975     return true;
 976 }
 977
 978 #pragma mark -
 979 #pragma mark engine methods
 980
 981 OSStatus engine_authorize(engine_t engine, auth_rights_t rights, auth_items_t enviroment, AuthorizationFlags flags)
 982 {
 983     __block OSStatus status = errAuthorizationSuccess;
 984     __block bool savePassword = false;
 985     ccaudit_t ccaudit = NULL;
 986
 987     require(rights != NULL, done);
 988
 989     ccaudit = ccaudit_create(engine->proc, engine->auth, AUE_ssauthorize);
 990     if (auth_rights_get_count(rights) > 0) {
 991         ccaudit_log(ccaudit, "begin evaluation", NULL, 0);
 992     }
 993
 994     engine->flags = flags;
 995
 996     if (enviroment) {
 997         _parse_enviroment(engine, enviroment);
 998         auth_items_copy(engine->hints, enviroment);
 999     }
1000
1001     auth_items_copy(engine->context, auth_token_get_context(engine->auth));
1002
1003     engine->dismissed = false;
1004     auth_rights_clear(engine->grantedRights);
1005
1006     auth_rights_iterate(rights, ^bool(const char *key) {
1007         if (!key)
1008             return true;
1009
1010
1011         if (!_verify_sandbox(engine, key)) {
1012             status = errAuthorizationDenied;
1013             return false;
1014         }
1015
1016         authdb_connection_t dbconn = authdb_connection_acquire(server_get_database()); // get db handle
1017
1018         LOGV("engine[%i]: evaluate right %s", connection_get_pid(engine->conn), key);
1019         rule_t rule = _find_rule(engine, dbconn, key);
1020         const char * rule_name = rule_get_name(rule);
1021         if (rule_name && (strcasecmp(rule_name, "") == 0)) {
1022             rule_name = "default (not defined)";
1023         }
1024         LOGV("engine[%i]: using rule %s", connection_get_pid(engine->conn), rule_name);
1025
1026         // only need the hints & mechanisms if we are going to show ui
1027         if (engine->flags & kAuthorizationFlagInteractionAllowed) {
1028             _set_right_hints(engine->hints, key);
1029             _set_localization_hints(dbconn, engine->hints, rule);
1030             if (!engine->authenticateRule) {
1031                 engine->authenticateRule = rule_create_with_string("authenticate", dbconn);
1032             }
1033         }
1034
1035         authdb_connection_release(&dbconn); // release db handle
1036
1037         engine->currentRightName = key;
1038         engine->currentRule = rule;
1039
1040         ccaudit_log(ccaudit, key, rule_name, 0);
1041
1042         status = _evaluate_rule(engine, engine->currentRule);
1043         switch (status) {
1044             case errAuthorizationSuccess:
1045                 auth_rights_add(engine->grantedRights, key);
1046                 auth_rights_set_flags(engine->grantedRights, key, auth_rights_get_flags(rights,key));
1047
1048                 if ((engine->flags & kAuthorizationFlagPreAuthorize) &&
1049                     (rule_get_class(engine->currentRule) == RC_USER) &&
1050                     (rule_get_timeout(engine->currentRule) == 0)) {
1051                     auth_rights_set_flags(engine->grantedRights, engine->currentRightName, kAuthorizationFlagPreAuthorize);
1052                 }
1053
1054                 LOG("Succeeded authorizing right '%s' by client '%s' [%d] for authorization created by '%s' [%d] (%X,%d)",
1055                     key, process_get_code_url(engine->proc), process_get_pid(engine->proc),
1056                     auth_token_get_code_url(engine->auth), auth_token_get_pid(engine->auth), engine->flags, auth_token_least_privileged(engine->auth));
1057                 if (rule_get_extract_password(engine->currentRule)) {
1058                     savePassword = true;
1059                 }
1060                 break;
1061             case errAuthorizationDenied:
1062             case errAuthorizationInteractionNotAllowed:
1063             case errAuthorizationCanceled:
1064                 if (engine->flags & kAuthorizationFlagInteractionAllowed) {
1065                     LOG("Failed to authorize right '%s' by client '%s' [%d] for authorization created by '%s' [%d] (%X,%d) (%i)",
1066                         key, process_get_code_url(engine->proc), process_get_pid(engine->proc),
1067                         auth_token_get_code_url(engine->auth), auth_token_get_pid(engine->auth), engine->flags, auth_token_least_privileged(engine->auth), status);
1068                 } else {
1069                     LOGV("Failed to authorize right '%s' by client '%s' [%d] for authorization created by '%s' [%d] (%X,%d) (%i)",
1070                         key, process_get_code_url(engine->proc), process_get_pid(engine->proc),
1071                         auth_token_get_code_url(engine->auth), auth_token_get_pid(engine->auth), engine->flags, auth_token_least_privileged(engine->auth), status);
1072                 }
1073                 break;
1074             default:
1075                 LOGE("engine[%i]: evaluate returned %i returning errAuthorizationInternal", connection_get_pid(engine->conn), status);
1076                 status = errAuthorizationInternal;
1077                 break;
1078         }
1079
1080         ccaudit_log_authorization(ccaudit, engine->currentRightName, status);
1081
1082         CFReleaseSafe(rule);
1083         engine->currentRightName = NULL;
1084         engine->currentRule = NULL;
1085
1086         auth_items_remove_with_flags(engine->hints, kEngineHintsFlagTemporary);
1087
1088         if (!(engine->flags & kAuthorizationFlagPartialRights) && (status != errAuthorizationSuccess)) {
1089             return false;
1090         }
1091
1092         return true;
1093     });
1094
1095     if ((engine->flags & kAuthorizationFlagPartialRights) && (auth_rights_get_count(engine->grantedRights) > 0)) {
1096         status = errAuthorizationSuccess;
1097     }
1098
1099     if (engine->dismissed) {
1100         status = errAuthorizationDenied;
1101     }
1102
1103     LOGV("engine[%i]: authorize result: %i", connection_get_pid(engine->conn), status);
1104
1105     if ((engine->flags & kAuthorizationFlagExtendRights) && !(engine->flags & kAuthorizationFlagDestroyRights)) {
1106         _cf_set_iterate(engine->credentials, ^bool(CFTypeRef value) {
1107             credential_t cred = (credential_t)value;
1108             // skip all uid credentials when running in least privileged
1109             if (auth_token_least_privileged(engine->auth) && !credential_is_right(cred))
1110                 return true;
1111
1112             session_t session = auth_token_get_session(engine->auth);
1113             auth_token_set_credential(engine->auth, cred);
1114             if (credential_get_shared(cred)) {
1115                 session_set_credential(session, cred);
1116             }
1117             if (credential_is_right(cred)) {
1118                 LOGV("engine[%i]: adding least privileged %scredential %s to authorization", connection_get_pid(engine->conn), credential_get_shared(cred) ? "shared " : "", credential_get_name(cred));
1119             } else {
1120                 LOGV("engine[%i]: adding %scredential %s (%i) to authorization", connection_get_pid(engine->conn), credential_get_shared(cred) ? "shared " : "", credential_get_name(cred), credential_get_uid(cred));
1121             }
1122             return true;
1123         });
1124     }
1125
1126     if ((status == errAuthorizationSuccess) || (status == errAuthorizationCanceled)) {
1127         if (savePassword && (status == errAuthorizationSuccess)) {
1128             auth_items_set_flags(engine->context, kAuthorizationEnvironmentPassword, kAuthorizationContextFlagExtractable);
1129         }
1130
1131         auth_items_copy_with_flags(auth_token_get_context(engine->auth), engine->context, kAuthorizationContextFlagExtractable);
1132     }
1133
1134     if (auth_rights_get_count(rights) > 0) {
1135         ccaudit_log(ccaudit, "end evaluation", NULL, status);
1136     }
1137
1138 #if DEBUG
1139     LOGV("engine[%i]: ********** Dumping auth->credentials **********", connection_get_pid(engine->conn));
1140     auth_token_credentials_iterate(engine->auth, ^bool(credential_t cred) {
1141         _show_cf(cred);
1142         return true;
1143     });
1144     LOGV("engine[%i]: ********** Dumping session->credentials **********", connection_get_pid(engine->conn));
1145     session_credentials_iterate(auth_token_get_session(engine->auth), ^bool(credential_t cred) {
1146         _show_cf(cred);
1147         return true;
1148     });
1149     LOGV("engine[%i]: ********** Dumping engine->context **********", connection_get_pid(engine->conn));
1150     _show_cf(engine->context);
1151     LOGV("engine[%i]: ********** Dumping auth->context **********", connection_get_pid(engine->conn));
1152     _show_cf(auth_token_get_context(engine->auth));
1153     LOGV("engine[%i]: ********** Dumping granted rights **********", connection_get_pid(engine->conn));
1154     _show_cf(engine->grantedRights);
1155 #endif
1156
1157 done:
1158     auth_items_clear(engine->context);
1159     auth_items_clear(engine->sticky_context);
1160     CFReleaseSafe(ccaudit);
1161     CFDictionaryRemoveAllValues(engine->mechanism_agents);
1162
1163     return status;
1164 }
1165
1166 static bool
1167 _wildcard_right_exists(engine_t engine, const char * right)
1168 {
1169     // checks if a wild card right exists
1170     // ex: com.apple. system.
1171     bool exists = false;
1172     rule_t rule = NULL;
1173     authdb_connection_t dbconn = authdb_connection_acquire(server_get_database()); // get db handle
1174     require(dbconn != NULL, done);
1175
1176     rule = _find_rule(engine, dbconn, right);
1177     require(rule != NULL, done);
1178
1179     const char * ruleName = rule_get_name(rule);
1180     require(ruleName != NULL, done);
1181     size_t len = strlen(ruleName);
1182     require(len != 0, done);
1183
1184     if (ruleName[len-1] == '.') {
1185         exists = true;
1186         goto done;
1187     }
1188
1189 done:
1190     authdb_connection_release(&dbconn);
1191     CFReleaseSafe(rule);
1192
1193     return exists;
1194 }
1195
1196 // Validate db right modification
1197
1198 // meta rights are constructed as follows:
1199 // we don't allow setting of wildcard rights, so you can only be more specific
1200 // note that you should never restrict things with a wildcard right without disallowing
1201 // changes to the entire domain.  ie.
1202 //              system.privilege.               -> never
1203 //              config.add.system.privilege.    -> never
1204 //              config.modify.system.privilege. -> never
1205 //              config.delete.system.privilege. -> never
1206 // For now we don't allow any configuration of configuration rules
1207 //              config.config. -> never
1208
1209 OSStatus engine_verify_modification(engine_t engine, rule_t rule, bool remove, bool force_modify)
1210 {
1211     OSStatus status = errAuthorizationDenied;
1212     auth_rights_t checkRight = NULL;
1213     char buf[BUFSIZ];
1214     memset(buf, 0, sizeof(buf));
1215
1216     const char * right = rule_get_name(rule);
1217     require(right != NULL, done);
1218     size_t len = strlen(right);
1219     require(len != 0, done);
1220
1221     require_action(right[len-1] != '.', done, LOGE("engine[%i]: not allowed to set wild card rules", connection_get_pid(engine->conn)));
1222
1223     if (strncasecmp(right, kConfigRight, strlen(kConfigRight)) == 0) {
1224         // special handling of meta right change:
1225                 // config.add. config.modify. config.remove. config.{}.
1226                 // check for config.<right> (which always starts with config.config.)
1227         strlcat(buf, kConfigRight, sizeof(buf));
1228     } else {
1229         bool existing = (rule_get_id(rule) != 0) ? true : _wildcard_right_exists(engine, right);
1230         if (!remove) {
1231             if (existing || force_modify) {
1232                 strlcat(buf, kAuthorizationConfigRightModify,sizeof(buf));
1233             } else {
1234                 strlcat(buf, kAuthorizationConfigRightAdd, sizeof(buf));
1235             }
1236         } else {
1237             if (existing) {
1238                 strlcat(buf, kAuthorizationConfigRightRemove, sizeof(buf));
1239             } else {
1240                 status = errAuthorizationSuccess;
1241                 goto done;
1242             }
1243         }
1244     }
1245
1246     strlcat(buf, right, sizeof(buf));
1247
1248     checkRight = auth_rights_create();
1249     auth_rights_add(checkRight, buf);
1250     status = engine_authorize(engine, checkRight, NULL, kAuthorizationFlagDefaults | kAuthorizationFlagInteractionAllowed | kAuthorizationFlagExtendRights);
1251
1252 done:
1253     LOGV("engine[%i]: authorizing %s for db modification: %i", connection_get_pid(engine->conn), right, status);
1254     CFReleaseSafe(checkRight);
1255     return status;
1256 }
1257
1258 void
1259 _engine_set_credential(engine_t engine, credential_t cred, bool shared)
1260 {
1261     LOGV("engine[%i]: adding %scredential %s (%i) to engine shared: %i", connection_get_pid(engine->conn), credential_get_shared(cred) ? "shared " : "", credential_get_name(cred), credential_get_uid(cred), shared);
1262     CFSetSetValue(engine->credentials, cred);
1263     if (shared) {
1264         credential_t sharedCred = credential_create_with_credential(cred, true);
1265         CFSetSetValue(engine->credentials, sharedCred);
1266         CFReleaseSafe(sharedCred);
1267     }
1268 }
1269
1270 auth_rights_t
1271 engine_get_granted_rights(engine_t engine)
1272 {
1273     return engine->grantedRights;
1274 }
1275
1276 CFAbsoluteTime engine_get_time(engine_t engine)
1277 {
1278     return engine->now;
1279 }
1280
1281 void engine_destroy_agents(engine_t engine)
1282 {
1283     engine->dismissed = true;
1284
1285     _cf_dictionary_iterate(engine->mechanism_agents, ^bool(CFTypeRef key __attribute__((__unused__)), CFTypeRef value) {
1286         LOGD("engine[%i]: Destroying %s", connection_get_pid(engine->conn), mechanism_get_string((mechanism_t)key));
1287         agent_t agent = (agent_t)value;
1288         agent_destroy(agent);
1289
1290         return true;
1291     });
1292 }
1293
1294 void engine_interrupt_agent(engine_t engine)
1295 {
1296     _cf_dictionary_iterate(engine->mechanism_agents, ^bool(CFTypeRef key __attribute__((__unused__)), CFTypeRef value) {
1297         agent_t agent = (agent_t)value;
1298         agent_notify_interrupt(agent);
1299         return true;
1300     });
1301 }