securityd-55199.3.tar.gz

[apple/securityd.git] / src / session.cpp

diff --git a/src/session.cpp b/src/session.cpp
index 704cf902386725de0a829f23bab1a6c0c0276783..b79f683ef247aaa461eb6ea1404197e95c15ecf1 100644 (file)
--- a/src/session.cpp
+++ b/src/session.cpp
@@ -25,11 +25,16 @@
 //
 // session - authentication session domains
 //
 //
 // session - authentication session domains
 //

-// A Session is defined by a mach_init bootstrap dictionary. These dictionaries are
-// hierarchical and inherited, so they work well for characterization of processes
-// that "belong" together. (Of course, if your mach_init is broken, you're in bad shape.)
+// Security sessions are now by definition congruent to audit subsystem sessions.
+// We represent these sessions within securityd as subclasses of class Session,
+// but we reach for the kernel's data whenever we're not sure if our data is
+// up to date.

 //
 //

-// Sessions are multi-threaded objects.
+// Modifications to session state are made from client space using system calls.
+// We discover them when we see changes in audit records as they come in with
+// new requests. We cannot use system notifications for such changes because
+// securityd is fully symmetrically multi-threaded, and thus may process new
+// requests from clients before it gets those notifications.

 //
 #include <pwd.h>
 #include <signal.h>                     // SIGTERM
 //
 #include <pwd.h>
 #include <signal.h>                     // SIGTERM


@@ -39,26 +44,39 @@
 #include "database.h"
 #include "server.h"
 #include <security_utilities/logging.h>
 #include "database.h"
 #include "server.h"
 #include <security_utilities/logging.h>

+#include <agentquery.h>
+
+using namespace CommonCriteria;
+

 
 //
 // The static session map
 //
 
 //
 // The static session map
 //

-PortMap<Session> Session::mSessions;
+Session::SessionMap Session::mSessions;
+Mutex Session::mSessionLock(Mutex::recursive);
+
+
+const char Session::kUsername[] = "username";
+const char Session::kRealname[] = "realname";

 
 

-std::string Session::kUsername = "username";
-std::string Session::kRealname = "realname";

 
 //
 // Create a Session object from initial parameters (create)
 //
 
 //
 // Create a Session object from initial parameters (create)
 //

-Session::Session(Bootstrap bootstrap, Port servicePort, SessionAttributeBits attrs) 
-    : mBootstrap(bootstrap), mServicePort(servicePort),
-         mAttributes(attrs), mSecurityAgent(NULL), mAuthHost(NULL)
+Session::Session(const AuditInfo &audit, Server &server)
+       : mAudit(audit), mSecurityAgent(NULL), mAuthHost(NULL), mKeybagState(0)

 {
 {

-    secdebug("SSsession", "%p CREATED: handle=%#x bootstrap=%d service=%d attrs=%#x",
-        this, handle(), mBootstrap.port(), mServicePort.port(), uint32_t(mAttributes));
-       SECURITYD_SESSION_CREATE(this, attrs, servicePort);
-       Syslog::notice("Session 0x%lx created", this->handle());
+       // link to Server as the global nexus in the object mesh
+       parent(server);
+       
+       // self-register
+       StLock<Mutex> _(mSessionLock);
+       assert(!mSessions[audit.sessionId()]);
+       mSessions[audit.sessionId()] = this;
+       
+       // log it
+       SECURITYD_SESSION_CREATE(this, this->sessionId(), &mAudit, sizeof(mAudit));
+       Syslog::notice("Session %d created", this->sessionId());

 }
 
 
 }
 
 


@@ -67,64 +85,84 @@ Session::Session(Bootstrap bootstrap, Port servicePort, SessionAttributeBits att
 //
 Session::~Session()
 {
 //
 Session::~Session()
 {

-    secdebug("SSsession", "%p DESTROYED: handle=%#x bootstrap=%d",
-        this, handle(), mBootstrap.port());
-       Syslog::notice("Session 0x%lx destroyed", this->handle());
+       SECURITYD_SESSION_DESTROY(this, this->sessionId());
+       Syslog::notice("Session %d destroyed", this->sessionId());

 }
 
 
 }
 
 

-//
-// Locate a session object by service port or (Session API) identifier
-//
-Session &Session::find(Port servicePort)
+Server &Session::server() const

 {
 {

-    StLock<Mutex> _(mSessions);
-       PortMap<Session>::const_iterator it = mSessions.find(servicePort);
-       assert(it != mSessions.end());
-       return *it->second;
+       return parent<Server>();

 }
 
 }
 

-Session &Session::find(SecuritySessionId id)
+
+//
+// Locate a session object by session identifier
+//
+Session &Session::find(pid_t id, bool create)

 {
 {

-    switch (id) {
-    case callerSecuritySession:
-        return Server::session();
-    default:
-               try {
-                       return U32HandleObject::find<Session>(id, CSSMERR_CSSM_INVALID_ADDIN_HANDLE);
-               } catch (const CommonError &err) {
-                       Syslog::warning("Session::find(%#x) failed rcode=%d", id, err.osStatus());
-                       for (PortMap<Session>::const_iterator it = mSessions.begin(); it != mSessions.end(); ++it)
-                               Syslog::notice(" Valid sessions include %#x attrs=%#x",
-                                       it->second->handle(), it->second->attributes());
-                       throw;
-               }
-    }
+       if (id == callerSecuritySession)
+               return Server::session();
+       StLock<Mutex> _(mSessionLock);
+       SessionMap::iterator it = mSessions.find(id);
+       if (it != mSessions.end())
+               return *it->second;
+
+       // new session
+       if (!create)
+               CssmError::throwMe(errSessionInvalidId);
+       AuditInfo info;
+       info.get(id);
+       assert(info.sessionId() == id);
+       RefPointer<Session> session = new DynamicSession(info);
+       mSessions.insert(make_pair(id, session));
+       return *session;

 }
 
 
 //
 }
 
 
 //

-// Act on a death notification for a session's (sub)bootstrap port.
+// Act on a death notification for a session's underlying audit session object.

 // We may not destroy the Session outright here (due to processes that use it),
 // but we do clear out its accumulated wealth.
 // We may not destroy the Session outright here (due to processes that use it),
 // but we do clear out its accumulated wealth.

+// Note that we may get spurious death notifications for audit sessions that we
+// never learned about. Ignore those.

 //
 //

-void Session::destroy(Port servPort)
+void Session::destroy(SessionId id)

 {
     // remove session from session map
 {
     // remove session from session map

-    StLock<Mutex> _(mSessions);
-    PortMap<Session>::iterator it = mSessions.find(servPort);
-    assert(it != mSessions.end());
-       RefPointer<Session> session = it->second;
-       SECURITYD_SESSION_DESTROY(session);
-       Syslog::notice("Session 0x%lx dead", session->handle());
-    mSessions.erase(it);
-       session->kill();
+    bool unlocked = false;
+    RefPointer<Session> session = NULL;
+    {
+        StLock<Mutex> _(mSessionLock);
+        SessionMap::iterator it = mSessions.find(id);
+        if (it != mSessions.end()) {
+            session = it->second;
+            assert(session->sessionId() == id);
+            mSessions.erase(it);
+
+            for (SessionMap::iterator kb_it = mSessions.begin(); kb_it != mSessions.end(); kb_it++) {
+                RefPointer<Session> kb_session = kb_it->second;
+                if (kb_session->originatorUid() == session->originatorUid()) {
+                    if (kb_session->keybagGetState(session_keybag_unlocked)) unlocked = true;
+                }
+            }
+        }
+    }
+
+    if (session.get()) {
+        if (!unlocked) {
+            service_context_t context = session->get_current_service_context();
+            service_client_kb_lock(&context);
+        }
+        session->kill();
+    }

 }
 
 }
 

+

 void Session::kill()
 {
     StLock<Mutex> _(*this);     // do we need to take this so early?
 void Session::kill()
 {
     StLock<Mutex> _(*this);     // do we need to take this so early?

-       
+       SECURITYD_SESSION_KILL(this, this->sessionId());

     invalidateSessionAuthHosts();
        
     // invalidate shared credentials
     invalidateSessionAuthHosts();
        
     // invalidate shared credentials


@@ -142,164 +180,147 @@ void Session::kill()
        PerSession::kill();
 }
 
        PerSession::kill();
 }
 

-void Session::invalidateSessionAuthHosts()
+
+//
+// Refetch audit session data for the current audit session (to catch outside updates
+// to the audit record). This is the price we're paying for not requiring an IPC to
+// securityd when audit session data changes (this is desirable for delayering the
+// software layer cake).
+// If we ever disallow changes to (parts of the) audit session record in the kernel,
+// we can loosen up on this continual re-fetching.
+//
+void Session::updateAudit() const

 {
 {

-    StLock<Mutex> _(mAuthHostLock);
-    
-    // if you got here, we don't care about pending operations: the auth hosts die
-    Syslog::warning("Killing auth hosts");
-    if (mSecurityAgent) mSecurityAgent->UnixPlusPlus::Child::kill(SIGTERM);
-    if (mAuthHost) mAuthHost->UnixPlusPlus::Child::kill(SIGTERM);
-    mSecurityAgent = NULL;
-    mAuthHost = NULL;
+    CommonCriteria::AuditInfo info;
+    try {
+        info.get(mAudit.sessionId());
+    } catch (...) {
+        return;
+    }
+    mAudit = info;

 }
 
 }
 

-void Session::invalidateAuthHosts()
+void Session::verifyKeyStorePassphrase(int32_t retries)

 {
 {

-       StLock<Mutex> _(mSessions);
-       for (PortMap<Session>::const_iterator it = mSessions.begin(); it != mSessions.end(); it++)
-        it->second->invalidateSessionAuthHosts();
+    QueryKeybagPassphrase keybagQuery(*this, retries);
+    keybagQuery.inferHints(Server::process());
+    if (keybagQuery.query() != SecurityAgent::noReason) {
+        CssmError::throwMe(CSSM_ERRCODE_OPERATION_AUTH_DENIED);
+    }

 }
 
 }
 

-//
-// On system sleep, call sleepProcessing on all DbCommons of all Sessions
-//
-void Session::processSystemSleep()
+void Session::changeKeyStorePassphrase()

 {
 {

-       StLock<Mutex> _(mSessions);
-       for (PortMap<Session>::const_iterator it = mSessions.begin(); it != mSessions.end(); it++)
-               it->second->allReferences(&DbCommon::sleepProcessing);
+    service_context_t context = get_current_service_context();
+    QueryKeybagNewPassphrase keybagQuery(*this);
+    keybagQuery.inferHints(Server::process());
+    CssmAutoData pass(Allocator::standard(Allocator::sensitive));
+    CssmAutoData oldPass(Allocator::standard(Allocator::sensitive));
+    SecurityAgent::Reason queryReason = keybagQuery.query(oldPass, pass);
+    if (queryReason == SecurityAgent::noReason) {
+        service_client_kb_change_secret(&context, oldPass.data(), (int)oldPass.length(), pass.data(), (int)pass.length());
+    } else {
+        CssmError::throwMe(CSSM_ERRCODE_OPERATION_AUTH_DENIED);
+    }

 }
 
 }
 

-
-//
-// On "lockAll", call sleepProcessing on all DbCommons of this session (only)
-//
-void Session::processLockAll()
+void Session::resetKeyStorePassphrase(const CssmData &passphrase)

 {
 {

-       allReferences(&DbCommon::lockProcessing);
+    service_context_t context = get_current_service_context();
+    service_client_kb_reset(&context, passphrase.data(), (int)passphrase.length());

 }
 
 }
 

-//
-// The root session inherits the startup bootstrap and service port
-//
-RootSession::RootSession(Server &server, SessionAttributeBits attrs)
-    : Session(Bootstrap(), server.primaryServicePort(),
-               sessionIsRoot | sessionWasInitialized | attrs)
+service_context_t Session::get_current_service_context()

 {
 {

-       parent(server);         // the Server is our parent
-       ref();                          // eternalize
-
-    // self-install (no thread safety issues here)
-       mSessions[mServicePort] = this;
+    // if this gets called from a timer there is no connection() object.
+    // need to check for valid connection object and pass the audit token along
+    service_context_t context = { sessionId(), originatorUid(), {} }; //*Server::connection().auditToken()
+    return context;

 }
 
 }
 

-//
-// Dynamic sessions use the given bootstrap and re-register in it
-//
-DynamicSession::DynamicSession(TaskPort taskPort)
-       : ReceivePort(Server::active().bootstrapName(), taskPort.bootstrap(), false),
-         Session(taskPort.bootstrap(), *this),
-         mOriginatorTask(taskPort), mHaveOriginatorUid(false)
+void Session::keybagClearState(int state)

 {
 {

-       // link to Server as the global nexus in the object mesh
-       parent(Server::active());
-       
-       // tell the server to listen to our port
-       Server::active().add(*this);
-       
-       // register for port notifications
-    Server::active().notifyIfDead(bootstrapPort());    //@@@??? still needed?
-       Server::active().notifyIfUnused(*this);
-
-       // self-register
-       StLock<Mutex> _(mSessions);
-       assert(!mSessions[*this]);  // can't be registered already (we just made it)
-       mSessions[*this] = this;
-       
-       secdebug("SSsession", "%p dynamic session originator=%d (pid=%d)",
-               this, mOriginatorTask.port(), taskPort.pid());
+    mKeybagState &= ~state;

 }
 
 }
 

-DynamicSession::~DynamicSession()
+void Session::keybagSetState(int state)

 {
 {

-       // remove our service port from the server
-       Server::active().remove(*this);
+    mKeybagState |= state;

 }
 
 }
 

-
-void DynamicSession::kill()
+bool Session::keybagGetState(int state)

 {
 {

-       StLock<Mutex> _(*this);
-       mBootstrap.destroy();           // release our bootstrap port
-       Session::kill();                        // continue with parent kill
+    return mKeybagState & state;

 }
 
 
 //
 }
 
 
 //

-// Set up a DynamicSession.
-// This call must be made from a process within the session, and it must be the first
-// such process to make the call.
+// Manage authorization client processes

 //
 //

-void DynamicSession::setupAttributes(SessionCreationFlags flags, SessionAttributeBits attrs)
+void Session::invalidateSessionAuthHosts()

 {
 {

-       StLock<Mutex> _(*this);
-       SECURITYD_SESSION_SETATTR(this, attrs);
-       Syslog::notice("Session 0x%lx attributes 0x%x", this->handle(), attrs);
-    secdebug("SSsession", "%p setup flags=%#x attrs=%#x", this, uint32_t(flags), uint32_t(attrs));
-    if (attrs & ~settableAttributes)
-        MacOSError::throwMe(errSessionInvalidAttributes);
-       checkOriginator();
-    if (attribute(sessionWasInitialized))
-        MacOSError::throwMe(errSessionAuthorizationDenied);
-    setAttributes(attrs | sessionWasInitialized);
+    StLock<Mutex> _(mAuthHostLock);
+    
+    // if you got here, we don't care about pending operations: the auth hosts die
+    Syslog::warning("Killing auth hosts");
+    if (mSecurityAgent) mSecurityAgent->UnixPlusPlus::Child::kill(SIGTERM);
+    if (mAuthHost) mAuthHost->UnixPlusPlus::Child::kill(SIGTERM);
+    mSecurityAgent = NULL;
+    mAuthHost = NULL;

 }
 
 }
 

+void Session::invalidateAuthHosts()
+{
+       StLock<Mutex> _(mSessionLock);
+       for (SessionMap::const_iterator it = mSessions.begin(); it != mSessions.end(); it++)
+        it->second->invalidateSessionAuthHosts();
+}

 
 //
 
 //

-// Check whether the calling process is the session originator.
-// If it's not, throw.
+// On system sleep, call sleepProcessing on all DbCommons of all Sessions

 //
 //

-void DynamicSession::checkOriginator()
+void Session::processSystemSleep()

 {
 {

-       if (mOriginatorTask != Server::process().taskPort())
-               MacOSError::throwMe(errSessionAuthorizationDenied);
+    SecurityAgentXPCQuery::killAllXPCClients();
+
+       StLock<Mutex> _(mSessionLock);
+       for (SessionMap::const_iterator it = mSessions.begin(); it != mSessions.end(); it++)
+               it->second->allReferences(&DbCommon::sleepProcessing);

 }
 
 
 //
 }
 
 
 //

-// The "originator uid" is a uid value that can be provided by the session originator
-// and retrieved by anyone. Securityd places no semantic meaning on this value.
+// On "lockAll", call sleepProcessing on all DbCommons of this session (only)

 //
 //

-uid_t DynamicSession::originatorUid() const
+void Session::processLockAll()

 {
 {

-       if (mHaveOriginatorUid)
-               return mOriginatorUid;
-       else
-               MacOSError::throwMe(errSessionValueNotSet);
+       allReferences(&DbCommon::lockProcessing);

 }
 
 
 }
 
 

-void DynamicSession::originatorUid(uid_t uid)
+//
+// The root session corresponds to the audit session that security is running in.
+// This is usually the initial system session; but in debug scenarios it may be
+// an "ordinary" graphic login session. In such a debug case, we may add attribute
+// flags to the session to make our (debugging) life easier.
+//
+RootSession::RootSession(uint64_t attributes, Server &server)
+       : Session(AuditInfo::current(), server)

 {
 {

-       checkOriginator();
-       if (mHaveOriginatorUid)         // must not re-set this
-               MacOSError::throwMe(errSessionAuthorizationDenied);
-       mHaveOriginatorUid = true;
-       mOriginatorUid = uid;
-
-       Server::active().longTermActivity();
-       struct passwd *pw = getpwuid(uid);
-
-       if (pw != NULL) {
+       ref();                          // eternalize
+       mAudit.ai_flags |= attributes;          // merge imposed attributes
+}

 
 

-        mOriginatorCredential = Credential(uid, pw->pw_name ? pw->pw_name : "", pw->pw_gecos ? pw->pw_gecos : "", "", true/*shared*/);
-        endpwent();
-       }

 
 

-       secdebug("SSsession", "%p session uid set to %d", this, uid);
+//
+// Dynamic sessions use the audit session context of the first-contact client caller.
+//
+DynamicSession::DynamicSession(const AuditInfo &audit)
+       : Session(audit, Server::active())
+{

 }
 
 }
 

+

 //
 // Authorization operations
 //
 //
 // Authorization operations
 //


@@ -420,7 +441,7 @@ OSStatus Session::authExternalize(const AuthorizationBlob &authBlob,
         AuthorizationExternalBlob &extBlob =
             reinterpret_cast<AuthorizationExternalBlob &>(extForm);
         extBlob.blob = auth.handle();
         AuthorizationExternalBlob &extBlob =
             reinterpret_cast<AuthorizationExternalBlob &>(extForm);
         extBlob.blob = auth.handle();

-        extBlob.session = bootstrapPort();
+        extBlob.session = this->sessionId();

                secdebug("SSauth", "Authorization %p externalized", &auth);
                return noErr;
        } else
                secdebug("SSauth", "Authorization %p externalized", &auth);
                return noErr;
        } else


@@ -449,6 +470,18 @@ OSStatus Session::authInternalize(const AuthorizationExternalForm &extForm,
 }
 
 
 }
 
 

+// 
+// Accessor method for setting audit session flags.
+// 
+void Session::setAttributes(SessionAttributeBits bits)
+{
+       StLock<Mutex> _(*this);
+       updateAudit();
+//     assert((bits & ~settableAttributes) == 0);
+       mAudit.ai_flags = bits;
+       mAudit.set();
+}
+

 //
 // The default session setup operation always fails.
 // Subclasses can override this to support session setup calls.
 //
 // The default session setup operation always fails.
 // Subclasses can override this to support session setup calls.


@@ -458,6 +491,14 @@ void Session::setupAttributes(SessionCreationFlags flags, SessionAttributeBits a
        MacOSError::throwMe(errSessionAuthorizationDenied);
 }
 
        MacOSError::throwMe(errSessionAuthorizationDenied);
 }
 

+uid_t Session::originatorUid()
+{
+    if (mAudit.uid() == AU_DEFAUDITID) {
+        StLock<Mutex> _(*this);
+        updateAudit();
+    }
+    return mAudit.uid();
+}

 
 //
 // Authorization database I/O
 
 //
 // Authorization database I/O


@@ -618,7 +659,6 @@ Session::authhost(const AuthHostType hostType, const bool restart)
 
 void DynamicSession::setUserPrefs(CFDataRef userPrefsDict)
 {
 
 void DynamicSession::setUserPrefs(CFDataRef userPrefsDict)
 {

-       checkOriginator();

        if (Server::process().uid() != 0)
                MacOSError::throwMe(errSessionAuthorizationDenied);
        StLock<Mutex> _(*this);
        if (Server::process().uid() != 0)
                MacOSError::throwMe(errSessionAuthorizationDenied);
        StLock<Mutex> _(*this);


@@ -642,8 +682,8 @@ CFDataRef DynamicSession::copyUserPrefs()
 void Session::dumpNode()
 {
        PerSession::dumpNode();
 void Session::dumpNode()
 {
        PerSession::dumpNode();

-       Debug::dump(" boot=%d service=%d attrs=%#x authhost=%p securityagent=%p",
-               mBootstrap.port(), mServicePort.port(), uint32_t(mAttributes), mAuthHost, mSecurityAgent);
+       Debug::dump(" auid=%d attrs=%#x authhost=%p securityagent=%p",
+               this->sessionId(), uint32_t(this->attributes()), mAuthHost, mSecurityAgent);

 }
 
 #endif //DEBUGDUMP
 }
 
 #endif //DEBUGDUMP