#include "engine.h"
#include "rule.h"
#include "authitems.h"
#include "authtoken.h"
#include "agent.h"
#include "process.h"
#include "debugging.h"
#include "server.h"
#include "credential.h"
#include "session.h"
#include "mechanism.h"
#include "authutilities.h"
#include "ccaudit.h"
#include "connection.h"
#include <pwd.h>
#include <Security/checkpw.h>
int checkpw_internal( const struct passwd *pw, const char* password );
#include <Security/AuthorizationTags.h>
#include <Security/AuthorizationTagsPriv.h>
#include <Security/AuthorizationPlugin.h>
#include <sandbox.h>
static void _set_process_hints(auth_items_t, process_t);
static void _set_process_immutable_hints(auth_items_t, process_t);
static void _set_auth_token_hints(auth_items_t, auth_token_t);
static OSStatus _evaluate_user_credential_for_rule(engine_t, credential_t, rule_t, bool, bool, enum Reason *);
static void _engine_set_credential(engine_t, credential_t, bool);
static OSStatus _evaluate_rule(engine_t, rule_t);
enum {
kEngineHintsFlagTemporary = (1 << 30)
};
#pragma mark -
#pragma mark engine creation
struct _engine_s {
__AUTH_BASE_STRUCT_HEADER__;
connection_t conn;
process_t proc;
auth_token_t auth;
AuthorizationFlags flags;
auth_items_t hints;
auth_items_t context;
auth_items_t sticky_context;
auth_items_t immutable_hints;
auth_rights_t grantedRights;
enum Reason reason;
int32_t tries;
CFAbsoluteTime now;
credential_t sessionCredential;
CFMutableSetRef credentials;
CFMutableSetRef effectiveCredentials;
CFMutableDictionaryRef mechanism_agents;
const char * currentRightName; rule_t currentRule;
rule_t authenticateRule;
bool dismissed;
};
static void
_engine_finalizer(CFTypeRef value)
{
engine_t engine = (engine_t)value;
CFReleaseSafe(engine->mechanism_agents);
CFReleaseSafe(engine->conn);
CFReleaseSafe(engine->auth);
CFReleaseSafe(engine->hints);
CFReleaseSafe(engine->context);
CFReleaseSafe(engine->immutable_hints);
CFReleaseSafe(engine->sticky_context);
CFReleaseSafe(engine->grantedRights);
CFReleaseSafe(engine->sessionCredential);
CFReleaseSafe(engine->credentials);
CFReleaseSafe(engine->effectiveCredentials);
CFReleaseSafe(engine->authenticateRule);
}
AUTH_TYPE_INSTANCE(engine,
.init = NULL,
.copy = NULL,
.finalize = _engine_finalizer,
.equal = NULL,
.hash = NULL,
.copyFormattingDesc = NULL,
.copyDebugDesc = NULL
);
static CFTypeID engine_get_type_id() {
static CFTypeID type_id = _kCFRuntimeNotATypeID;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
type_id = _CFRuntimeRegisterClass(&_auth_type_engine);
});
return type_id;
}
engine_t
engine_create(connection_t conn, auth_token_t auth)
{
engine_t engine = NULL;
require(conn != NULL, done);
require(auth != NULL, done);
engine = (engine_t)_CFRuntimeCreateInstance(kCFAllocatorDefault, engine_get_type_id(), AUTH_CLASS_SIZE(engine), NULL);
require(engine != NULL, done);
engine->conn = (connection_t)CFRetain(conn);
engine->proc = connection_get_process(conn);
engine->auth = (auth_token_t)CFRetain(auth);
engine->hints = auth_items_create();
engine->context = auth_items_create();
engine->immutable_hints = auth_items_create();
engine->sticky_context = auth_items_create();
_set_process_hints(engine->hints, engine->proc);
_set_process_immutable_hints(engine->immutable_hints, engine->proc);
_set_auth_token_hints(engine->hints, auth);
engine->grantedRights = auth_rights_create();
engine->reason = noReason;
engine->now = CFAbsoluteTimeGetCurrent();
session_update(auth_token_get_session(engine->auth));
engine->sessionCredential = credential_create(session_get_uid(auth_token_get_session(engine->auth)));
engine->credentials = CFSetCreateMutable(kCFAllocatorDefault, 0, &kCFTypeSetCallBacks);
engine->effectiveCredentials = CFSetCreateMutable(kCFAllocatorDefault, 0, &kCFTypeSetCallBacks);
session_credentials_iterate(auth_token_get_session(engine->auth), ^bool(credential_t cred) {
CFSetAddValue(engine->effectiveCredentials, cred);
return true;
});
auth_token_credentials_iterate(engine->auth, ^bool(credential_t cred) {
if (!credential_get_shared(cred)) {
CFSetAddValue(engine->credentials, cred);
}
return true;
});
engine->mechanism_agents = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
done:
return engine;
}
#pragma mark -
#pragma mark agent hints
void
_set_process_hints(auth_items_t hints, process_t proc)
{
RequestorType type = bundle;
auth_items_set_data(hints, AGENT_HINT_CLIENT_TYPE, &type, sizeof(type));
auth_items_set_int(hints, AGENT_HINT_CLIENT_PID, process_get_pid(proc));
auth_items_set_uint(hints, AGENT_HINT_CLIENT_UID, process_get_uid(proc));
}
void
_set_process_immutable_hints(auth_items_t immutable_hints, process_t proc)
{
auth_items_set_bool(immutable_hints, AGENT_HINT_PROCESS_SIGNED, process_apple_signed(proc));
}
void
_set_auth_token_hints(auth_items_t hints, auth_token_t auth)
{
auth_items_set_string(hints, AGENT_HINT_CLIENT_PATH, auth_token_get_code_url(auth));
auth_items_set_int(hints, AGENT_HINT_CREATOR_PID, auth_token_get_pid(auth));
const audit_info_s * info = auth_token_get_audit_info(auth);
auth_items_set_data(hints, AGENT_HINT_CREATOR_AUDIT_TOKEN, &info->opaqueToken, sizeof(info->opaqueToken));
}
static void
_set_right_hints(auth_items_t hints, const char * right)
{
auth_items_set_string(hints, AGENT_HINT_AUTHORIZE_RIGHT, right);
}
static void
_set_rule_hints(auth_items_t hints, rule_t rule)
{
auth_items_set_string(hints, AGENT_HINT_AUTHORIZE_RULE, rule_get_name(rule));
const char * group = rule_get_group(rule);
if (rule_get_class(rule) == RC_USER && group != NULL) {
auth_items_set_string(hints, AGENT_HINT_REQUIRE_USER_IN_GROUP, group);
} else {
auth_items_remove(hints, AGENT_HINT_REQUIRE_USER_IN_GROUP);
}
}
static void
_set_localization_hints(authdb_connection_t dbconn, auth_items_t hints, rule_t rule)
{
char * key = calloc(1u, 128);
authdb_step(dbconn, "SELECT lang,value FROM prompts WHERE r_id = ?", ^(sqlite3_stmt *stmt) {
sqlite3_bind_int64(stmt, 1, rule_get_id(rule));
}, ^bool(auth_items_t data) {
snprintf(key, 128, "%s%s", kAuthorizationRuleParameterDescription, auth_items_get_string(data, "lang"));
auth_items_set_string(hints, key, auth_items_get_string(data, "value"));
auth_items_set_flags(hints, key, kEngineHintsFlagTemporary);
return true;
});
authdb_step(dbconn, "SELECT lang,value FROM buttons WHERE r_id = ?", ^(sqlite3_stmt *stmt) {
sqlite3_bind_int64(stmt, 1, rule_get_id(rule));
}, ^bool(auth_items_t data) {
snprintf(key, 128, "%s%s", kAuthorizationRuleParameterButton, auth_items_get_string(data, "lang"));
auth_items_set_string(hints, key, auth_items_get_string(data, "value"));
auth_items_set_flags(hints, key, kEngineHintsFlagTemporary);
return true;
});
free_safe(key);
}
static void
_set_session_hints(engine_t engine, rule_t rule)
{
LOGV("engine[%i]: ** prepare agent hints for rule %s", connection_get_pid(engine->conn), rule_get_name(rule));
if (_evaluate_user_credential_for_rule(engine, engine->sessionCredential, rule, true, true, NULL) == errAuthorizationSuccess) {
const char * tmp = credential_get_name(engine->sessionCredential);
if (tmp != NULL) {
auth_items_set_string(engine->hints, AGENT_HINT_SUGGESTED_USER, tmp);
}
tmp = credential_get_realname(engine->sessionCredential);
if (tmp != NULL) {
auth_items_set_string(engine->hints, AGENT_HINT_SUGGESTED_USER_LONG, tmp);
}
} else {
auth_items_remove(engine->hints, AGENT_HINT_SUGGESTED_USER);
auth_items_remove(engine->hints, AGENT_HINT_SUGGESTED_USER_LONG);
}
}
#pragma mark -
#pragma mark right processing
static OSStatus
_evaluate_credential_for_rule(engine_t engine, credential_t cred, rule_t rule, bool ignoreShared, bool sessionOwner, enum Reason * reason)
{
if (auth_token_least_privileged(engine->auth)) {
if (credential_is_right(cred) && credential_get_valid(cred) && _compare_string(engine->currentRightName, credential_get_name(cred))) {
if (!ignoreShared) {
if (!rule_get_shared(rule) && credential_get_shared(cred)) {
LOGV("engine[%i]: - shared right %s (does NOT satisfy rule)", connection_get_pid(engine->conn), credential_get_name(cred));
if (reason) { *reason = unknownReason; }
return errAuthorizationDenied;
}
}
return errAuthorizationSuccess;
} else {
if (reason) { *reason = unknownReason; }
return errAuthorizationDenied;
}
} else {
return _evaluate_user_credential_for_rule(engine,cred,rule,ignoreShared,sessionOwner, reason);
}
}
static OSStatus
_evaluate_user_credential_for_rule(engine_t engine, credential_t cred, rule_t rule, bool ignoreShared, bool sessionOwner, enum Reason * reason)
{
const char * cred_label = sessionOwner ? "session owner" : "credential";
LOGV("engine[%i]: - validating %s%s %s (%i) for %s", connection_get_pid(engine->conn),
credential_get_shared(cred) ? "shared " : "",
cred_label,
credential_get_name(cred),
credential_get_uid(cred),
rule_get_name(rule));
if (rule_get_class(rule) != RC_USER) {
LOGV("engine[%i]: - invalid rule class %i (denied)", connection_get_pid(engine->conn), rule_get_class(rule));
return errAuthorizationDenied;
}
if (credential_get_valid(cred) != true) {
LOGV("engine[%i]: - %s %i invalid (does NOT satisfy rule)", connection_get_pid(engine->conn), cred_label, credential_get_uid(cred));
if (reason) { *reason = invalidPassphrase; }
return errAuthorizationDenied;
}
if (engine->now - credential_get_creation_time(cred) > rule_get_timeout(rule)) {
LOGV("engine[%i]: - %s %i expired '%f > %lli' (does NOT satisfy rule)", connection_get_pid(engine->conn), cred_label, credential_get_uid(cred),
(engine->now - credential_get_creation_time(cred)), rule_get_timeout(rule));
if (reason) { *reason = unknownReason; }
return errAuthorizationDenied;
}
if (!ignoreShared) {
if (!rule_get_shared(rule) && credential_get_shared(cred)) {
LOGV("engine[%i]: - shared %s %i (does NOT satisfy rule)", connection_get_pid(engine->conn), cred_label, credential_get_uid(cred));
if (reason) { *reason = unknownReason; }
return errAuthorizationDenied;
}
}
if (credential_get_uid(cred) == 0) {
LOGV("engine[%i]: - %s %i has uid 0 (does satisfy rule)", connection_get_pid(engine->conn), cred_label, credential_get_uid(cred));
return errAuthorizationSuccess;
}
if (rule_get_session_owner(rule)) {
if (credential_get_uid(cred) == session_get_uid(auth_token_get_session(engine->auth))) {
LOGV("engine[%i]: - %s %i is session owner (does satisfy rule)", connection_get_pid(engine->conn), cred_label, credential_get_uid(cred));
return errAuthorizationSuccess;
}
}
if (rule_get_group(rule) != NULL) {
do
{
if (!rule_get_authenticate_user(rule)) {
if (rule_check_flags(rule, RuleFlagEntitledAndGroup | RuleFlagVPNEntitledAndGroup)) {
break;
}
}
if (credential_check_membership(cred, rule_get_group(rule))) {
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));
return errAuthorizationSuccess;
} else {
if (reason) { *reason = userNotInGroup; }
}
} while (0);
} else if (rule_get_session_owner(rule)) { if (reason) { *reason = unacceptableUser; }
}
LOGV("engine[%i]: - %s %i (does NOT satisfy rule)", connection_get_pid(engine->conn), cred_label, credential_get_uid(cred));
return errAuthorizationDenied;
}
static agent_t
_get_agent(engine_t engine, mechanism_t mech, bool create, bool firstMech)
{
agent_t agent = (agent_t)CFDictionaryGetValue(engine->mechanism_agents, mech);
if (create && !agent) {
agent = agent_create(engine, mech, engine->auth, engine->proc, firstMech);
if (agent) {
CFDictionaryAddValue(engine->mechanism_agents, mech, agent);
CFReleaseSafe(agent);
}
}
return agent;
}
static uint64_t
_evaluate_builtin_mechanism(engine_t engine, mechanism_t mech)
{
uint64_t result = kAuthorizationResultDeny;
switch (mechanism_get_type(mech)) {
case kMechanismTypeEntitled:
if (auth_token_has_entitlement_for_right(engine->auth, engine->currentRightName)) {
result = kAuthorizationResultAllow;
}
break;
default:
break;
}
return result;
}
static OSStatus
_evaluate_mechanisms(engine_t engine, CFArrayRef mechanisms)
{
uint64_t result = kAuthorizationResultAllow;
ccaudit_t ccaudit = ccaudit_create(engine->proc, engine->auth, AUE_ssauthmech);
auth_items_t context = auth_items_create();
auth_items_t hints = auth_items_create();
auth_items_copy(context, engine->context);
auth_items_copy(hints, engine->hints);
auth_items_copy(context, engine->sticky_context);
CFIndex count = CFArrayGetCount(mechanisms);
for (CFIndex i = 0; i < count; i++) {
mechanism_t mech = (mechanism_t)CFArrayGetValueAtIndex(mechanisms, i);
if (mechanism_get_type(mech)) {
LOGV("engine[%i]: running builtin mechanism %s (%li of %li)", connection_get_pid(engine->conn), mechanism_get_string(mech), i+1, count);
result = _evaluate_builtin_mechanism(engine, mech);
} else {
agent_t agent = _get_agent(engine, mech, true, i == 0);
require_action(agent != NULL, done, result = kAuthorizationResultUndefined; LOGE("engine[%i]: error creating mechanism agent", connection_get_pid(engine->conn)));
LOGV("engine[%i]: running mechanism %s (%li of %li)", connection_get_pid(engine->conn), mechanism_get_string(agent_get_mechanism(agent)), i+1, count);
result = agent_run(agent, hints, context, engine->immutable_hints);
auth_items_copy(context, agent_get_context(agent));
auth_items_copy(hints, agent_get_hints(agent));
bool interrupted = false;
for (CFIndex i2 = 0; i2 != i; i2++) {
agent_t agent2 = _get_agent(engine, (mechanism_t)CFArrayGetValueAtIndex(mechanisms, i2), false, i == 0);
if (agent_get_state(agent2) == interrupting) {
agent_deactivate(agent);
interrupted = true;
i = i2 - 1;
char * buf = NULL;
asprintf(&buf, "evaluation interrupted by %s; restarting evaluation there", mechanism_get_string(agent_get_mechanism(agent2)));
ccaudit_log_mechanism(ccaudit, engine->currentRightName, mechanism_get_string(agent_get_mechanism(agent2)), kAuthorizationResultAllow, buf);
free_safe(buf);
auth_items_copy(context, agent_get_context(agent2));
auth_items_copy(hints, agent_get_hints(agent2));
break;
}
}
const char * token_name = auth_items_get_string(hints, AGENT_HINT_TOKEN_NAME);
if (token_name && strlen(token_name) == 0) {
auth_items_remove(hints, AGENT_HINT_TOKEN_NAME);
}
if (interrupted) {
LOGV("engine[%i]: mechanisms interrupted", connection_get_pid(engine->conn));
enum Reason reason = worldChanged;
auth_items_set_data(hints, AGENT_HINT_RETRY_REASON, &reason, sizeof(reason));
result = kAuthorizationResultAllow;
_cf_dictionary_iterate(engine->mechanism_agents, ^bool(CFTypeRef key __attribute__((__unused__)), CFTypeRef value) {
agent_t tempagent = (agent_t)value;
agent_clear_interrupt(tempagent);
return true;
});
}
}
if (result == kAuthorizationResultAllow) {
ccaudit_log_mechanism(ccaudit, engine->currentRightName, mechanism_get_string(mech), kAuthorizationResultAllow, NULL);
} else {
ccaudit_log_mechanism(ccaudit, engine->currentRightName, mechanism_get_string(mech), (uint32_t)result, NULL);
break;
}
}
done:
if ((result == kAuthorizationResultUserCanceled) || (result == kAuthorizationResultAllow)) {
auth_items_set_flags(context, kAuthorizationEnvironmentPassword, kAuthorizationContextFlagVolatile);
auth_items_copy_with_flags(engine->context, context, kAuthorizationContextFlagExtractable | kAuthorizationContextFlagVolatile);
} else if (result == kAuthorizationResultDeny) {
auth_items_clear(engine->sticky_context);
auth_items_copy_with_flags(engine->sticky_context, context, kAuthorizationContextFlagSticky);
}
CFReleaseSafe(ccaudit);
CFReleaseSafe(context);
CFReleaseSafe(hints);
switch(result)
{
case kAuthorizationResultDeny:
return errAuthorizationDenied;
case kAuthorizationResultUserCanceled:
return errAuthorizationCanceled;
case kAuthorizationResultAllow:
return errAuthorizationSuccess;
case kAuthorizationResultUndefined:
return errAuthorizationInternal;
default:
{
LOGV("engine[%i]: unexpected error result", connection_get_pid(engine->conn));
return errAuthorizationInternal;
}
}
}
static OSStatus
_evaluate_authentication(engine_t engine, rule_t rule)
{
OSStatus status = errAuthorizationDenied;
ccaudit_t ccaudit = ccaudit_create(engine->proc, engine->auth, AUE_ssauthint);
LOGV("engine[%i]: evaluate authentication", connection_get_pid(engine->conn));
_set_rule_hints(engine->hints, rule);
_set_session_hints(engine, rule);
CFArrayRef mechanisms = rule_get_mechanisms(rule);
if (!(CFArrayGetCount(mechanisms) > 0)) {
mechanisms = rule_get_mechanisms(engine->authenticateRule);
}
require_action(CFArrayGetCount(mechanisms) > 0, done, LOGV("engine[%i]: error no mechanisms found", connection_get_pid(engine->conn)));
int64_t ruleTries = rule_get_tries(rule);
for (engine->tries = 0; engine->tries < ruleTries; engine->tries++) {
auth_items_set_data(engine->hints, AGENT_HINT_RETRY_REASON, &engine->reason, sizeof(engine->reason));
auth_items_set_int(engine->hints, AGENT_HINT_TRIES, engine->tries);
status = _evaluate_mechanisms(engine, mechanisms);
LOGV("engine[%i]: evaluate mechanisms result %i", connection_get_pid(engine->conn), status);
if (status == errAuthorizationSuccess) {
status = errAuthorizationDenied;
credential_t newCred = NULL;
if (auth_items_exist(engine->context, "uid")) {
newCred = credential_create(auth_items_get_uint(engine->context, "uid"));
} else {
LOGV("engine[%i]: mechanism failed to return a valid uid", connection_get_pid(engine->conn));
}
if (newCred) {
if (credential_get_valid(newCred)) {
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);
ccaudit_log_success(ccaudit, newCred, engine->currentRightName);
} else {
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);
ccaudit_log_failure(ccaudit, auth_items_get_string(engine->context, "username"), engine->currentRightName);
}
status = _evaluate_user_credential_for_rule(engine, newCred, rule, true, false, &engine->reason);
if (status == errAuthorizationSuccess) {
_engine_set_credential(engine, newCred, rule_get_shared(rule));
CFReleaseSafe(newCred);
if (auth_token_least_privileged(engine->auth)) {
credential_t rightCred = credential_create_with_right(engine->currentRightName);
_engine_set_credential(engine, rightCred, rule_get_shared(rule));
CFReleaseSafe(rightCred);
}
session_t session = auth_token_get_session(engine->auth);
if (credential_get_uid(newCred) == session_get_uid(session)) {
LOGV("engine[%i]: authenticated as the session owner", connection_get_pid(engine->conn));
session_set_attributes(auth_token_get_session(engine->auth), AU_SESSION_FLAG_HAS_AUTHENTICATED);
}
break;
}
CFReleaseSafe(newCred);
}
} else if (status == errAuthorizationCanceled || status == errAuthorizationInternal) {
break;
} else if (status == errAuthorizationDenied) {
engine->reason = invalidPassphrase;
}
}
if (engine->tries == ruleTries) {
engine->reason = tooManyTries;
auth_items_set_data(engine->hints, AGENT_HINT_RETRY_REASON, &engine->reason, sizeof(engine->reason));
auth_items_set_int(engine->hints, AGENT_HINT_TRIES, engine->tries);
_evaluate_mechanisms(engine, mechanisms);
ccaudit_log(ccaudit, engine->currentRightName, NULL, 1113);
}
done:
CFReleaseSafe(ccaudit);
return status;
}
static bool
_check_entitlement_for_rule(engine_t engine, rule_t rule)
{
bool entitled = false;
CFTypeRef value = NULL;
if (rule_check_flags(rule, RuleFlagEntitledAndGroup)) {
if (auth_token_has_entitlement_for_right(engine->auth, engine->currentRightName)) {
if (credential_check_membership(auth_token_get_credential(engine->auth), rule_get_group(rule))) {
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));
entitled = true;
goto done;
}
}
}
if (rule_check_flags(rule, RuleFlagVPNEntitledAndGroup)) {
value = auth_token_copy_entitlement_value(engine->auth, "com.apple.networking.vpn.configuration");
if (value) {
if (credential_check_membership(auth_token_get_credential(engine->auth), rule_get_group(rule))) {
LOGV("engine[%i]: creator of authorization has VPN entitlement and is member of group '%s'", connection_get_pid(engine->conn), rule_get_group(rule));
entitled = true;
goto done;
}
}
}
done:
CFReleaseSafe(value);
return entitled;
}
static OSStatus
_evaluate_class_user(engine_t engine, rule_t rule)
{
__block OSStatus status = errAuthorizationDenied;
if (_check_entitlement_for_rule(engine,rule)) {
return errAuthorizationSuccess;
}
if (rule_get_allow_root(rule) && auth_token_get_uid(engine->auth) == 0) {
LOGV("engine[%i]: creator of authorization has uid == 0 granting right %s", connection_get_pid(engine->conn), engine->currentRightName);
return errAuthorizationSuccess;
}
if (!rule_get_authenticate_user(rule)) {
status = _evaluate_user_credential_for_rule(engine, engine->sessionCredential, rule, true, true, NULL);
if (status == errAuthorizationSuccess) {
return errAuthorizationSuccess;
}
return errAuthorizationDenied;
}
_cf_set_iterate(engine->credentials, ^bool(CFTypeRef value) {
credential_t cred = (credential_t)value;
if (auth_token_least_privileged(engine->auth) && !credential_is_right(cred) && credential_get_valid(cred)) {
status = _evaluate_user_credential_for_rule(engine, cred, rule, false, false, NULL);
if (errAuthorizationSuccess == status) {
credential_t rightCred = credential_create_with_right(engine->currentRightName);
_engine_set_credential(engine,rightCred,rule_get_shared(rule));
CFReleaseSafe(rightCred);
return false; }
}
status = _evaluate_credential_for_rule(engine, cred, rule, false, false, NULL);
if (status == errAuthorizationSuccess) {
return false; }
return true;
});
if (status == errAuthorizationSuccess) {
return status;
}
_cf_set_iterate(engine->effectiveCredentials, ^bool(CFTypeRef value) {
credential_t cred = (credential_t)value;
status = _evaluate_credential_for_rule(engine, cred, rule, false, false, NULL);
if (status == errAuthorizationSuccess) {
_engine_set_credential(engine, cred, false);
return false; }
return true;
});
if (status == errAuthorizationSuccess) {
return status;
}
if (!(engine->flags & kAuthorizationFlagExtendRights)) {
LOGV("engine[%i]: authorization denied (kAuthorizationFlagExtendRights not set)", connection_get_pid(engine->conn));
return errAuthorizationDenied;
}
if (engine->flags & kAuthorizationFlagPreAuthorize && rule_get_timeout(rule) == 0) {
return errAuthorizationSuccess;
}
if (!(engine->flags & kAuthorizationFlagInteractionAllowed)) {
LOGV("engine[%i]: Interaction not allowed (kAuthorizationFlagInteractionAllowed not set)", connection_get_pid(engine->conn));
return errAuthorizationInteractionNotAllowed;
}
if (!(session_get_attributes(auth_token_get_session(engine->auth)) & AU_SESSION_FLAG_HAS_GRAPHIC_ACCESS)) {
LOGV("engine[%i]: Interaction not allowed (session has no ui access)", connection_get_pid(engine->conn));
return errAuthorizationInteractionNotAllowed;
}
if (server_in_dark_wake()) {
LOGV("engine[%i]: authorization denied (in DarkWake)", connection_get_pid(engine->conn));
return errAuthorizationDenied;
}
return _evaluate_authentication(engine,rule);
}
static OSStatus
_evaluate_class_rule(engine_t engine, rule_t rule)
{
__block OSStatus status = errAuthorizationDenied;
int64_t kofn = rule_get_kofn(rule);
uint32_t total = (uint32_t)rule_get_delegates_count(rule);
__block uint32_t success_count = 0;
__block uint32_t count = 0;
LOGV("engine[%i]: ** rule %s has %zi delegates kofn = %lli", connection_get_pid(engine->conn), rule_get_name(rule), total, kofn);
rule_delegates_iterator(rule, ^bool(rule_t delegate) {
count++;
if (kofn != 0 && success_count == kofn) {
status = errAuthorizationSuccess;
return false;
}
LOGV("engine[%i]: * evaluate rule %s (%i)", connection_get_pid(engine->conn), rule_get_name(delegate), count);
status = _evaluate_rule(engine, delegate);
if ((status == errAuthorizationCanceled) || (status == errAuthorizationInternal))
return false;
if (status != errAuthorizationSuccess) {
if (kofn != 0) {
if ((total - count) < (kofn - success_count)) {
LOGD("engine[%i]: rule evaluation remaining: %i, required: %lli", connection_get_pid(engine->conn), (total - count), (kofn - success_count));
return false;
}
return true;
}
return false;
} else {
success_count++;
return true;
}
});
return status;
}
static OSStatus
_evaluate_class_mechanism(engine_t engine, rule_t rule)
{
OSStatus status = errAuthorizationDenied;
CFArrayRef mechanisms = NULL;
require_action(rule_get_mechanisms_count(rule) > 0, done, status = errAuthorizationSuccess; LOGV("engine[%i]: no mechanisms specified", connection_get_pid(engine->conn)));
mechanisms = rule_get_mechanisms(rule);
if (server_in_dark_wake()) {
CFIndex count = CFArrayGetCount(mechanisms);
for (CFIndex i = 0; i < count; i++) {
if (!mechanism_is_privileged((mechanism_t)CFArrayGetValueAtIndex(mechanisms, i))) {
LOGV("engine[%i]: authorization denied (in DarkWake)", connection_get_pid(engine->conn));
goto done;
}
}
}
int64_t ruleTries = rule_get_tries(rule);
engine->tries = 0;
do {
auth_items_set_data(engine->hints, AGENT_HINT_RETRY_REASON, &engine->reason, sizeof(engine->reason));
auth_items_set_int(engine->hints, AGENT_HINT_TRIES, engine->tries);
status = _evaluate_mechanisms(engine, mechanisms);
LOGV("engine[%i]: evaluate mechanisms result %i", connection_get_pid(engine->conn), status);
if ((status == errAuthorizationSuccess) || (status == errAuthorizationCanceled)) {
if (status == errAuthorizationSuccess) {
credential_t newCred = NULL;
if (auth_items_exist(engine->context, "uid")) {
newCred = credential_create(auth_items_get_uint(engine->context, "uid"));
} else {
LOGV("engine[%i]: mechanism did not return a uid", connection_get_pid(engine->conn));
}
if (newCred) {
_engine_set_credential(engine, newCred, rule_get_shared(rule));
if (auth_token_least_privileged(engine->auth)) {
credential_t rightCred = credential_create_with_right(engine->currentRightName);
_engine_set_credential(engine, rightCred, rule_get_shared(rule));
CFReleaseSafe(rightCred);
}
if (strcmp(engine->currentRightName, "system.login.console") == 0 && !auth_items_exist(engine->context, AGENT_CONTEXT_AUTO_LOGIN)) {
session_set_attributes(auth_token_get_session(engine->auth), AU_SESSION_FLAG_HAS_AUTHENTICATED);
}
CFReleaseSafe(newCred);
}
}
}
engine->tries++;
} while ( (status == errAuthorizationDenied) && ((ruleTries == 0) || ((ruleTries > 0) && engine->tries < ruleTries))); done:
return status;
}
static OSStatus
_evaluate_rule(engine_t engine, rule_t rule)
{
if (rule_check_flags(rule, RuleFlagEntitled)) {
if (auth_token_has_entitlement_for_right(engine->auth, engine->currentRightName)) {
LOGV("engine[%i]: rule allow, creator of authorization has entitlement for right %s", connection_get_pid(engine->conn), engine->currentRightName);
return errAuthorizationSuccess;
}
}
if (rule_check_flags(rule, RuleFlagRequireAppleSigned)) {
if (!auth_token_apple_signed(engine->auth)) {
LOGV("engine[%i]: rule deny, creator of authorization is not signed by apple", connection_get_pid(engine->conn));
return errAuthorizationDenied;
}
}
switch (rule_get_class(rule)) {
case RC_ALLOW:
LOGV("engine[%i]: rule set to allow", connection_get_pid(engine->conn));
return errAuthorizationSuccess;
case RC_DENY:
LOGV("engine[%i]: rule set to deny", connection_get_pid(engine->conn));
return errAuthorizationDenied;
case RC_USER:
return _evaluate_class_user(engine,rule);
case RC_RULE:
return _evaluate_class_rule(engine, rule);
case RC_MECHANISM:
return _evaluate_class_mechanism(engine, rule);
default:
LOGV("engine[%i]: invalid class for rule or rule not found", connection_get_pid(engine->conn));
return errAuthorizationInternal;
}
}
static rule_t
_find_rule(engine_t engine, authdb_connection_t dbconn, const char * string)
{
rule_t r = NULL;
size_t sLen = strlen(string);
char * buf = calloc(1u, sLen + 1);
strlcpy(buf, string, sLen + 1);
char * ptr = buf + sLen;
__block int64_t count = 0;
for (;;) {
authdb_step(dbconn, "SELECT COUNT(name) AS cnt FROM rules WHERE name = ? AND type = 1",
^(sqlite3_stmt *stmt) {
sqlite3_bind_text(stmt, 1, buf, -1, NULL);
}, ^bool(auth_items_t data) {
count = auth_items_get_int64(data, "cnt");
return false;
});
if (count > 0) {
r = rule_create_with_string(buf, dbconn);
goto done;
}
if (*ptr == '.') {
*ptr = '\0';
}
ptr = strrchr(buf, '.');
if (ptr) {
*(ptr+1) = '\0';
} else {
break;
}
}
done:
free_safe(buf);
if (r == NULL) {
r = rule_create_with_string("", dbconn);
if (rule_get_id(r) == 0) {
CFReleaseNull(r);
LOGE("engine[%i]: default rule lookup error (missing), using builtin defaults", connection_get_pid(engine->conn));
r = rule_create_default();
}
}
return r;
}
static void _parse_enviroment(engine_t engine, auth_items_t enviroment)
{
require(enviroment != NULL, done);
#if DEBUG
LOGV("engine[%i]: Dumping Enviroment", connection_get_pid(engine->conn));
_show_cf(enviroment);
#endif
if (engine->flags & kAuthorizationFlagExtendRights) {
const char * user = auth_items_get_string(enviroment, kAuthorizationEnvironmentUsername);
const char * pass = auth_items_get_string(enviroment, kAuthorizationEnvironmentPassword);
bool shared = auth_items_exist(enviroment, kAuthorizationEnvironmentShared);
require(user != NULL, done);
struct passwd *pw = getpwnam(user);
require_action(pw != NULL, done, LOGE("engine[%i]: user not found %s", connection_get_pid(engine->conn), user));
int checkpw_status = checkpw_internal(pw, pass ? pass : "");
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));
credential_t cred = credential_create(pw->pw_uid);
if (credential_get_valid(cred)) {
LOG("engine[%i]: checkpw() succeeded, creating credential for user %s", connection_get_pid(engine->conn), user);
_engine_set_credential(engine, cred, shared);
auth_items_set_string(engine->context, kAuthorizationEnvironmentUsername, user);
auth_items_set_string(engine->context, kAuthorizationEnvironmentPassword, pass ? pass : "");
}
CFReleaseSafe(cred);
}
done:
endpwent();
return;
}
static bool _verify_sandbox(engine_t engine, const char * right)
{
pid_t pid = process_get_pid(engine->proc);
if (sandbox_check(pid, "authorization-right-obtain", SANDBOX_FILTER_RIGHT_NAME, right)) {
LOGE("Sandbox denied authorizing right '%s' by client '%s' [%d]", right, process_get_code_url(engine->proc), pid);
return false;
}
pid = auth_token_get_pid(engine->auth);
if (auth_token_get_sandboxed(engine->auth) && sandbox_check(pid, "authorization-right-obtain", SANDBOX_FILTER_RIGHT_NAME, right)) {
LOGE("Sandbox denied authorizing right '%s' for authorization created by '%s' [%d]", right, auth_token_get_code_url(engine->auth), pid);
return false;
}
return true;
}
#pragma mark -
#pragma mark engine methods
OSStatus engine_authorize(engine_t engine, auth_rights_t rights, auth_items_t enviroment, AuthorizationFlags flags)
{
__block OSStatus status = errAuthorizationSuccess;
__block bool savePassword = false;
ccaudit_t ccaudit = NULL;
require(rights != NULL, done);
ccaudit = ccaudit_create(engine->proc, engine->auth, AUE_ssauthorize);
if (auth_rights_get_count(rights) > 0) {
ccaudit_log(ccaudit, "begin evaluation", NULL, 0);
}
engine->flags = flags;
if (enviroment) {
_parse_enviroment(engine, enviroment);
auth_items_copy(engine->hints, enviroment);
}
auth_items_copy(engine->context, auth_token_get_context(engine->auth));
engine->dismissed = false;
auth_rights_clear(engine->grantedRights);
auth_rights_iterate(rights, ^bool(const char *key) {
if (!key)
return true;
if (!_verify_sandbox(engine, key)) {
status = errAuthorizationDenied;
return false;
}
authdb_connection_t dbconn = authdb_connection_acquire(server_get_database());
LOGV("engine[%i]: evaluate right %s", connection_get_pid(engine->conn), key);
rule_t rule = _find_rule(engine, dbconn, key);
const char * rule_name = rule_get_name(rule);
if (rule_name && (strcasecmp(rule_name, "") == 0)) {
rule_name = "default (not defined)";
}
LOGV("engine[%i]: using rule %s", connection_get_pid(engine->conn), rule_name);
if (engine->flags & kAuthorizationFlagInteractionAllowed) {
_set_right_hints(engine->hints, key);
_set_localization_hints(dbconn, engine->hints, rule);
if (!engine->authenticateRule) {
engine->authenticateRule = rule_create_with_string("authenticate", dbconn);
}
}
authdb_connection_release(&dbconn);
engine->currentRightName = key;
engine->currentRule = rule;
ccaudit_log(ccaudit, key, rule_name, 0);
status = _evaluate_rule(engine, engine->currentRule);
switch (status) {
case errAuthorizationSuccess:
auth_rights_add(engine->grantedRights, key);
auth_rights_set_flags(engine->grantedRights, key, auth_rights_get_flags(rights,key));
if ((engine->flags & kAuthorizationFlagPreAuthorize) &&
(rule_get_class(engine->currentRule) == RC_USER) &&
(rule_get_timeout(engine->currentRule) == 0)) {
auth_rights_set_flags(engine->grantedRights, engine->currentRightName, kAuthorizationFlagPreAuthorize);
}
LOG("Succeeded authorizing right '%s' by client '%s' [%d] for authorization created by '%s' [%d] (%X,%d)",
key, process_get_code_url(engine->proc), process_get_pid(engine->proc),
auth_token_get_code_url(engine->auth), auth_token_get_pid(engine->auth), engine->flags, auth_token_least_privileged(engine->auth));
if (rule_get_extract_password(engine->currentRule)) {
savePassword = true;
}
break;
case errAuthorizationDenied:
case errAuthorizationInteractionNotAllowed:
case errAuthorizationCanceled:
if (engine->flags & kAuthorizationFlagInteractionAllowed) {
LOG("Failed to authorize right '%s' by client '%s' [%d] for authorization created by '%s' [%d] (%X,%d) (%i)",
key, process_get_code_url(engine->proc), process_get_pid(engine->proc),
auth_token_get_code_url(engine->auth), auth_token_get_pid(engine->auth), engine->flags, auth_token_least_privileged(engine->auth), status);
} else {
LOGV("Failed to authorize right '%s' by client '%s' [%d] for authorization created by '%s' [%d] (%X,%d) (%i)",
key, process_get_code_url(engine->proc), process_get_pid(engine->proc),
auth_token_get_code_url(engine->auth), auth_token_get_pid(engine->auth), engine->flags, auth_token_least_privileged(engine->auth), status);
}
break;
default:
LOGE("engine[%i]: evaluate returned %i returning errAuthorizationInternal", connection_get_pid(engine->conn), status);
status = errAuthorizationInternal;
break;
}
ccaudit_log_authorization(ccaudit, engine->currentRightName, status);
CFReleaseSafe(rule);
engine->currentRightName = NULL;
engine->currentRule = NULL;
auth_items_remove_with_flags(engine->hints, kEngineHintsFlagTemporary);
if (!(engine->flags & kAuthorizationFlagPartialRights) && (status != errAuthorizationSuccess)) {
return false;
}
return true;
});
if ((engine->flags & kAuthorizationFlagPartialRights) && (auth_rights_get_count(engine->grantedRights) > 0)) {
status = errAuthorizationSuccess;
}
if (engine->dismissed) {
status = errAuthorizationDenied;
}
LOGV("engine[%i]: authorize result: %i", connection_get_pid(engine->conn), status);
if ((engine->flags & kAuthorizationFlagExtendRights) && !(engine->flags & kAuthorizationFlagDestroyRights)) {
_cf_set_iterate(engine->credentials, ^bool(CFTypeRef value) {
credential_t cred = (credential_t)value;
if (auth_token_least_privileged(engine->auth) && !credential_is_right(cred))
return true;
session_t session = auth_token_get_session(engine->auth);
auth_token_set_credential(engine->auth, cred);
if (credential_get_shared(cred)) {
session_set_credential(session, cred);
}
if (credential_is_right(cred)) {
LOGV("engine[%i]: adding least privileged %scredential %s to authorization", connection_get_pid(engine->conn), credential_get_shared(cred) ? "shared " : "", credential_get_name(cred));
} else {
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));
}
return true;
});
}
if ((status == errAuthorizationSuccess) || (status == errAuthorizationCanceled)) {
if (savePassword && (status == errAuthorizationSuccess)) {
auth_items_set_flags(engine->context, kAuthorizationEnvironmentPassword, kAuthorizationContextFlagExtractable);
}
auth_items_copy_with_flags(auth_token_get_context(engine->auth), engine->context, kAuthorizationContextFlagExtractable);
}
if (auth_rights_get_count(rights) > 0) {
ccaudit_log(ccaudit, "end evaluation", NULL, status);
}
#if DEBUG
LOGV("engine[%i]: ********** Dumping auth->credentials **********", connection_get_pid(engine->conn));
auth_token_credentials_iterate(engine->auth, ^bool(credential_t cred) {
_show_cf(cred);
return true;
});
LOGV("engine[%i]: ********** Dumping session->credentials **********", connection_get_pid(engine->conn));
session_credentials_iterate(auth_token_get_session(engine->auth), ^bool(credential_t cred) {
_show_cf(cred);
return true;
});
LOGV("engine[%i]: ********** Dumping engine->context **********", connection_get_pid(engine->conn));
_show_cf(engine->context);
LOGV("engine[%i]: ********** Dumping auth->context **********", connection_get_pid(engine->conn));
_show_cf(auth_token_get_context(engine->auth));
LOGV("engine[%i]: ********** Dumping granted rights **********", connection_get_pid(engine->conn));
_show_cf(engine->grantedRights);
#endif
done:
auth_items_clear(engine->context);
auth_items_clear(engine->sticky_context);
CFReleaseSafe(ccaudit);
CFDictionaryRemoveAllValues(engine->mechanism_agents);
return status;
}
static bool
_wildcard_right_exists(engine_t engine, const char * right)
{
bool exists = false;
rule_t rule = NULL;
authdb_connection_t dbconn = authdb_connection_acquire(server_get_database()); require(dbconn != NULL, done);
rule = _find_rule(engine, dbconn, right);
require(rule != NULL, done);
const char * ruleName = rule_get_name(rule);
require(ruleName != NULL, done);
size_t len = strlen(ruleName);
require(len != 0, done);
if (ruleName[len-1] == '.') {
exists = true;
goto done;
}
done:
authdb_connection_release(&dbconn);
CFReleaseSafe(rule);
return exists;
}
OSStatus engine_verify_modification(engine_t engine, rule_t rule, bool remove, bool force_modify)
{
OSStatus status = errAuthorizationDenied;
auth_rights_t checkRight = NULL;
char buf[BUFSIZ];
memset(buf, 0, sizeof(buf));
const char * right = rule_get_name(rule);
require(right != NULL, done);
size_t len = strlen(right);
require(len != 0, done);
require_action(right[len-1] != '.', done, LOGE("engine[%i]: not allowed to set wild card rules", connection_get_pid(engine->conn)));
if (strncasecmp(right, kConfigRight, strlen(kConfigRight)) == 0) {
strlcat(buf, kConfigRight, sizeof(buf));
} else {
bool existing = (rule_get_id(rule) != 0) ? true : _wildcard_right_exists(engine, right);
if (!remove) {
if (existing || force_modify) {
strlcat(buf, kAuthorizationConfigRightModify,sizeof(buf));
} else {
strlcat(buf, kAuthorizationConfigRightAdd, sizeof(buf));
}
} else {
if (existing) {
strlcat(buf, kAuthorizationConfigRightRemove, sizeof(buf));
} else {
status = errAuthorizationSuccess;
goto done;
}
}
}
strlcat(buf, right, sizeof(buf));
checkRight = auth_rights_create();
auth_rights_add(checkRight, buf);
status = engine_authorize(engine, checkRight, NULL, kAuthorizationFlagDefaults | kAuthorizationFlagInteractionAllowed | kAuthorizationFlagExtendRights);
done:
LOGV("engine[%i]: authorizing %s for db modification: %i", connection_get_pid(engine->conn), right, status);
CFReleaseSafe(checkRight);
return status;
}
void
_engine_set_credential(engine_t engine, credential_t cred, bool shared)
{
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);
CFSetSetValue(engine->credentials, cred);
if (shared) {
credential_t sharedCred = credential_create_with_credential(cred, true);
CFSetSetValue(engine->credentials, sharedCred);
CFReleaseSafe(sharedCred);
}
}
auth_rights_t
engine_get_granted_rights(engine_t engine)
{
return engine->grantedRights;
}
CFAbsoluteTime engine_get_time(engine_t engine)
{
return engine->now;
}
void engine_destroy_agents(engine_t engine)
{
engine->dismissed = true;
_cf_dictionary_iterate(engine->mechanism_agents, ^bool(CFTypeRef key __attribute__((__unused__)), CFTypeRef value) {
LOGD("engine[%i]: Destroying %s", connection_get_pid(engine->conn), mechanism_get_string((mechanism_t)key));
agent_t agent = (agent_t)value;
agent_destroy(agent);
return true;
});
}
void engine_interrupt_agent(engine_t engine)
{
_cf_dictionary_iterate(engine->mechanism_agents, ^bool(CFTypeRef key __attribute__((__unused__)), CFTypeRef value) {
agent_t agent = (agent_t)value;
agent_notify_interrupt(agent);
return true;
});
}