Trusted-path permission checking
[hcoop/domtool2.git] / src / main.sml
index 5025cb2..90a5e94 100644 (file)
@@ -167,6 +167,9 @@ fun eval' fname =
 val dispatcher =
     Config.dispatcher ^ ":" ^ Int.toString Config.dispatcherPort
 
+val self =
+    "localhost:" ^ Int.toString Config.slavePort
+
 fun requestContext f =
     let
        val uid = Posix.ProcEnv.getuid ()
@@ -191,6 +194,13 @@ fun requestBio f =
        (user, OpenSSL.connect (context, dispatcher))
     end
 
+fun requestSlaveBio () =
+    let
+       val (user, context) = requestContext (fn () => ())
+    in
+       (user, OpenSSL.connect (context, self))
+    end
+
 fun request fname =
     let
        val (user, bio) = requestBio (fn () => ignore (check fname))
@@ -275,6 +285,54 @@ fun requestDir dname =
     end
     handle ErrorMsg.Error => ()
 
+fun requestPing () =
+    let
+       val (_, bio) = requestBio (fn () => ())
+    in
+       OpenSSL.close bio;
+       OS.Process.success
+    end
+    handle _ => OS.Process.failure
+
+fun requestShutdown () =
+    let
+       val (_, bio) = requestBio (fn () => ())
+    in
+       Msg.send (bio, MsgShutdown);
+       case Msg.recv bio of
+           NONE => print "Server closed connection unexpectedly.\n"
+         | SOME m =>
+           case m of
+               MsgOk => print "Shutdown begun.\n"
+             | MsgError s => print ("Shutdown failed: " ^ s ^ "\n")
+             | _ => print "Unexpected server reply.\n";
+       OpenSSL.close bio
+    end
+
+fun requestSlavePing () =
+    let
+       val (_, bio) = requestSlaveBio ()
+    in
+       OpenSSL.close bio;
+       OS.Process.success
+    end
+    handle _ => OS.Process.failure
+
+fun requestSlaveShutdown () =
+    let
+       val (_, bio) = requestSlaveBio ()
+    in
+       Msg.send (bio, MsgShutdown);
+       case Msg.recv bio of
+           NONE => print "Server closed connection unexpectedly.\n"
+         | SOME m =>
+           case m of
+               MsgOk => print "Shutdown begun.\n"
+             | MsgError s => print ("Shutdown failed: " ^ s ^ "\n")
+             | _ => print "Unexpected server reply.\n";
+       OpenSSL.close bio
+    end
+
 fun requestGrant acl =
     let
        val (user, bio) = requestBio (fn () => ())
@@ -401,6 +459,21 @@ fun requestDbUser dbtype =
        OpenSSL.close bio
     end
 
+fun requestDbPasswd rc =
+    let
+       val (_, bio) = requestBio (fn () => ())
+    in
+       Msg.send (bio, MsgDbPasswd rc);
+       case Msg.recv bio of
+           NONE => print "Server closed connection unexpectedly.\n"
+         | SOME m =>
+           case m of
+               MsgOk => print "Your password has been changed.\n"
+             | MsgError s => print ("Password set failed: " ^ s ^ "\n")
+             | _ => print "Unexpected server reply.\n";
+       OpenSSL.close bio
+    end
+
 fun requestDbTable p =
     let
        val (user, bio) = requestBio (fn () => ())
@@ -416,6 +489,22 @@ fun requestDbTable p =
        OpenSSL.close bio
     end
 
+fun requestListMailboxes domain =
+    let
+       val (_, bio) = requestBio (fn () => ())
+    in
+       Msg.send (bio, MsgListMailboxes domain);
+       (case Msg.recv bio of
+            NONE => Vmail.Error "Server closed connection unexpectedly."
+          | SOME m =>
+            case m of
+                MsgMailboxes users => (Msg.send (bio, MsgOk);
+                                       Vmail.Listing users)
+              | MsgError s => Vmail.Error ("Creation failed: " ^ s)
+              | _ => Vmail.Error "Unexpected server reply.")
+       before OpenSSL.close bio
+    end
+
 fun requestNewMailbox p =
     let
        val (_, bio) = requestBio (fn () => ())
@@ -461,6 +550,176 @@ fun requestRmMailbox p =
        OpenSSL.close bio
     end
 
+fun requestSaQuery addr =
+    let
+       val (_, bio) = requestBio (fn () => ())
+    in
+       Msg.send (bio, MsgSaQuery addr);
+       (case Msg.recv bio of
+            NONE => print "Server closed connection unexpectedly.\n"
+          | SOME m =>
+            case m of
+                MsgSaStatus b => (print ("SpamAssassin filtering for " ^ addr ^ " is "
+                                         ^ (if b then "ON" else "OFF") ^ ".\n");
+                                  Msg.send (bio, MsgOk))
+              | MsgError s => print ("Query failed: " ^ s ^ "\n")
+              | _ => print "Unexpected server reply.\n")
+       before OpenSSL.close bio
+    end
+
+fun requestSaSet p =
+    let
+       val (_, bio) = requestBio (fn () => ())
+    in
+       Msg.send (bio, MsgSaSet p);
+       case Msg.recv bio of
+           NONE => print "Server closed connection unexpectedly.\n"
+         | SOME m =>
+           case m of
+               MsgOk => print ("SpamAssassin filtering for " ^ #1 p ^ " is now "
+                               ^ (if #2 p then "ON" else "OFF") ^ ".\n")
+             | MsgError s => print ("Set failed: " ^ s ^ "\n")
+             | _ => print "Unexpected server reply.\n";
+       OpenSSL.close bio
+    end
+
+fun requestSmtpLog domain =
+    let
+       val (_, bio) = requestBio (fn () => ())
+
+       val _ = Msg.send (bio, MsgSmtpLogReq domain)
+
+       fun loop () =
+           case Msg.recv bio of
+               NONE => print "Server closed connection unexpectedly.\n"
+             | SOME m =>
+               case m of
+                   MsgOk => ()
+                 | MsgSmtpLogRes line => (print line;
+                                          loop ())
+                 | MsgError s => print ("Log search failed: " ^ s ^ "\n")
+                 | _ => print "Unexpected server reply.\n"
+    in
+       loop ();
+       OpenSSL.close bio
+    end
+
+fun requestApt {node, pkg} =
+    let
+       val (user, context) = requestContext (fn () => ())
+       val bio = OpenSSL.connect (context, if node = Config.masterNode then
+                                               dispatcher
+                                           else
+                                               Domain.nodeIp node ^ ":" ^ Int.toString Config.slavePort)
+
+       val _ = Msg.send (bio, MsgQuery (QApt pkg))
+
+       fun loop () =
+           case Msg.recv bio of
+               NONE => (print "Server closed connection unexpectedly.\n";
+                        OS.Process.failure)
+             | SOME m =>
+               case m of
+                   MsgYes => (print "Package is installed.\n";
+                              OS.Process.success)
+                 | MsgNo => (print "Package is not installed.\n";
+                             OS.Process.failure)
+                 | MsgError s => (print ("APT query failed: " ^ s ^ "\n");
+                                  OS.Process.failure)
+                 | _ => (print "Unexpected server reply.\n";
+                         OS.Process.failure)
+    in
+       loop ()
+       before OpenSSL.close bio
+    end
+
+fun requestCron {node, uname} =
+    let
+       val (user, context) = requestContext (fn () => ())
+       val bio = OpenSSL.connect (context, if node = Config.masterNode then
+                                               dispatcher
+                                           else
+                                               Domain.nodeIp node ^ ":" ^ Int.toString Config.slavePort)
+
+       val _ = Msg.send (bio, MsgQuery (QCron uname))
+
+       fun loop () =
+           case Msg.recv bio of
+               NONE => (print "Server closed connection unexpectedly.\n";
+                        OS.Process.failure)
+             | SOME m =>
+               case m of
+                   MsgYes => (print "User has cron permissions.\n";
+                              OS.Process.success)
+                 | MsgNo => (print "User does not have cron permissions.\n";
+                             OS.Process.failure)
+                 | MsgError s => (print ("Cron query failed: " ^ s ^ "\n");
+                                  OS.Process.failure)
+                 | _ => (print "Unexpected server reply.\n";
+                         OS.Process.failure)
+    in
+       loop ()
+       before OpenSSL.close bio
+    end
+
+fun requestFtp {node, uname} =
+    let
+       val (user, context) = requestContext (fn () => ())
+       val bio = OpenSSL.connect (context, if node = Config.masterNode then
+                                               dispatcher
+                                           else
+                                               Domain.nodeIp node ^ ":" ^ Int.toString Config.slavePort)
+
+       val _ = Msg.send (bio, MsgQuery (QFtp uname))
+
+       fun loop () =
+           case Msg.recv bio of
+               NONE => (print "Server closed connection unexpectedly.\n";
+                        OS.Process.failure)
+             | SOME m =>
+               case m of
+                   MsgYes => (print "User has FTP permissions.\n";
+                              OS.Process.success)
+                 | MsgNo => (print "User does not have FTP permissions.\n";
+                             OS.Process.failure)
+                 | MsgError s => (print ("FTP query failed: " ^ s ^ "\n");
+                                  OS.Process.failure)
+                 | _ => (print "Unexpected server reply.\n";
+                         OS.Process.failure)
+    in
+       loop ()
+       before OpenSSL.close bio
+    end
+
+fun requestTrustedPath {node, uname} =
+    let
+       val (user, context) = requestContext (fn () => ())
+       val bio = OpenSSL.connect (context, if node = Config.masterNode then
+                                               dispatcher
+                                           else
+                                               Domain.nodeIp node ^ ":" ^ Int.toString Config.slavePort)
+
+       val _ = Msg.send (bio, MsgQuery (QTrustedPath uname))
+
+       fun loop () =
+           case Msg.recv bio of
+               NONE => (print "Server closed connection unexpectedly.\n";
+                        OS.Process.failure)
+             | SOME m =>
+               case m of
+                   MsgYes => (print "User has trusted path restriction.\n";
+                              OS.Process.success)
+                 | MsgNo => (print "User does not have trusted path restriction.\n";
+                             OS.Process.failure)
+                 | MsgError s => (print ("Trusted path query failed: " ^ s ^ "\n");
+                                  OS.Process.failure)
+                 | _ => (print "Unexpected server reply.\n";
+                         OS.Process.failure)
+    in
+       loop ()
+       before OpenSSL.close bio
+    end
+
 fun regenerate context =
     let
        val b = basis ()
@@ -522,6 +781,7 @@ fun regenerate context =
            end
                handle IO.Io _ => ()
                     | OS.SysErr (s, _) => print ("System error processing user " ^ user ^ ": " ^ s ^ "\n")
+                    | ErrorMsg.Error => print ("User " ^ user ^ " had a compilation error.\n")
     in
        app contactNode Config.nodeIps;
        Env.pre ();
@@ -541,6 +801,22 @@ fun rmuser user =
        Domain.rmdom doms
     end
 
+fun now () = Date.toString (Date.fromTimeUniv (Time.now ()))
+
+fun answerQuery q =
+    case q of
+       QApt pkg => if Apt.installed pkg then MsgYes else MsgNo
+      | QCron user => if Cron.allowed user then MsgYes else MsgNo
+      | QFtp user => if Ftp.allowed user then MsgYes else MsgNo
+      | QTrustedPath user => if TrustedPath.query user then MsgYes else MsgNo
+
+fun describeQuery q =
+    case q of
+       QApt pkg => "Requested installation status of package " ^ pkg
+      | QCron user => "Asked about cron permissions for user " ^ user
+      | QFtp user => "Asked about FTP permissions for user " ^ user
+      | QTrustedPath user => "Asked about trusted path settings for user " ^ user
+
 fun service () =
     let
        val () = Acl.read Config.aclFile
@@ -558,7 +834,7 @@ fun service () =
              | SOME bio =>
                let
                    val user = OpenSSL.peerCN bio
-                   val () = print ("\nConnection from " ^ user ^ "\n")
+                   val () = print ("\nConnection from " ^ user ^ " at " ^ now () ^ "\n")
                    val () = Domain.setUser user
 
                    fun doIt f cleanup =
@@ -620,6 +896,20 @@ fun service () =
                                 (fn () => OS.FileSys.remove outname)
                        end
 
+                   fun checkAddr s =
+                       case String.fields (fn ch => ch = #"@") s of
+                           [user'] =>
+                           if user = user' then
+                               SOME (SetSA.User s)
+                           else
+                               NONE
+                         | [user', domain] =>
+                           if Domain.validEmailUser user' andalso Domain.yourDomain domain then
+                               SOME (SetSA.Email s)
+                           else
+                               NONE
+                         | _ => NONE
+
                    fun cmdLoop () =
                        case Msg.recv bio of
                            NONE => (OpenSSL.close bio
@@ -630,6 +920,16 @@ fun service () =
                                MsgConfig code => doConfig [code]
                              | MsgMultiConfig codes => doConfig codes
 
+                             | MsgShutdown =>
+                               if Acl.query {user = user, class = "priv", value = "all"}
+                                  orelse Acl.query {user = user, class = "priv", value = "shutdown"} then
+                                   print ("Domtool dispatcher shutting down at " ^ now () ^ "\n\n")
+                               else
+                                   (print "Unauthorized shutdown command!\n";
+                                    OpenSSL.close bio
+                                    handle OpenSSL.OpenSSL _ => ();
+                                    loop ())
+
                              | MsgGrant acl =>
                                doIt (fn () =>
                                         if Acl.query {user = user, class = "priv", value = "all"} then
@@ -721,6 +1021,20 @@ fun service () =
                                                  SOME ("Error adding user: " ^ msg)))
                                     (fn () => ())
 
+                             | MsgDbPasswd {dbtype, passwd} =>
+                               doIt (fn () =>
+                                        case Dbms.lookup dbtype of
+                                            NONE => ("Database passwd request with unknown datatype type " ^ dbtype,
+                                                     SOME ("Unknown database type " ^ dbtype))
+                                          | SOME handler =>
+                                            case #passwd handler {user = user, passwd = passwd} of
+                                                NONE => ("Changed " ^ dbtype ^ " password of user " ^ user ^ ".",
+                                                         NONE)
+                                              | SOME msg =>
+                                                ("Error setting " ^ dbtype ^ " password of user " ^ user ^ ": " ^ msg,
+                                                 SOME ("Error adding user: " ^ msg)))
+                                    (fn () => ())
+
                              | MsgCreateDbTable {dbtype, dbname} =>
                                doIt (fn () =>
                                         if Dbms.validDbname dbname then
@@ -738,12 +1052,26 @@ fun service () =
                                              SOME ("Invalid database name " ^ dbname)))
                                     (fn () => ())
 
+                             | MsgListMailboxes domain =>
+                               doIt (fn () =>
+                                        if not (Domain.yourDomain domain) then
+                                            ("User wasn't authorized to list mailboxes for " ^ domain,
+                                             SOME "You're not authorized to configure that domain.")
+                                        else
+                                            case Vmail.list domain of
+                                                Vmail.Listing users => (Msg.send (bio, MsgMailboxes users);
+                                                                        ("Sent mailbox list for " ^ domain,
+                                                                         NONE))
+                                              | Vmail.Error msg => ("Error listing mailboxes for " ^ domain ^ ": " ^ msg,
+                                                                    SOME msg))
+                                    (fn () => ())
+
                              | MsgNewMailbox {domain, user = emailUser, passwd, mailbox} =>
                                doIt (fn () =>
                                         if not (Domain.yourDomain domain) then
                                             ("User wasn't authorized to add a mailbox to " ^ domain,
                                              SOME "You're not authorized to configure that domain.")
-                                        else if not (Domain.validUser emailUser) then
+                                        else if not (Domain.validEmailUser emailUser) then
                                             ("Invalid e-mail username " ^ emailUser,
                                              SOME "Invalid e-mail username")
                                         else if not (CharVector.all Char.isGraph passwd) then
@@ -758,7 +1086,7 @@ fun service () =
                                                             passwd = passwd, mailbox = mailbox} of
                                                 NONE => ("Added mailbox " ^ emailUser ^ "@" ^ domain ^ " at " ^ mailbox,
                                                          NONE)
-                                              | SOME msg => ("Error adding mailbox: " ^ msg,
+                                              | SOME msg => ("Error adding mailbox " ^ emailUser ^ "@" ^ domain ^ ": " ^ msg,
                                                              SOME msg))
                                     (fn () => ())
                                
@@ -767,7 +1095,7 @@ fun service () =
                                         if not (Domain.yourDomain domain) then
                                             ("User wasn't authorized to change password of a mailbox for " ^ domain,
                                              SOME "You're not authorized to configure that domain.")
-                                        else if not (Domain.validUser emailUser) then
+                                        else if not (Domain.validEmailUser emailUser) then
                                             ("Invalid e-mail username " ^ emailUser,
                                              SOME "Invalid e-mail username")
                                         else if not (CharVector.all Char.isGraph passwd) then
@@ -778,7 +1106,7 @@ fun service () =
                                                                passwd = passwd} of
                                                 NONE => ("Changed password of mailbox " ^ emailUser ^ "@" ^ domain,
                                                          NONE)
-                                              | SOME msg => ("Error changing mailbox password: " ^ msg,
+                                              | SOME msg => ("Error changing mailbox password for " ^ emailUser ^ "@" ^ domain ^ ": " ^ msg,
                                                              SOME msg))
                                     (fn () => ())
 
@@ -787,17 +1115,57 @@ fun service () =
                                         if not (Domain.yourDomain domain) then
                                             ("User wasn't authorized to change password of a mailbox for " ^ domain,
                                              SOME "You're not authorized to configure that domain.")
-                                        else if not (Domain.validUser emailUser) then
+                                        else if not (Domain.validEmailUser emailUser) then
                                             ("Invalid e-mail username " ^ emailUser,
                                              SOME "Invalid e-mail username")
                                         else
                                             case Vmail.rm {domain = domain, user = emailUser} of
                                                 NONE => ("Deleted mailbox " ^ emailUser ^ "@" ^ domain,
                                                          NONE)
-                                              | SOME msg => ("Error deleting mailbox: " ^ msg,
+                                              | SOME msg => ("Error deleting mailbox " ^ emailUser ^ "@" ^ domain ^ ": " ^ msg,
                                                              SOME msg))
                                     (fn () => ())
 
+                             | MsgSaQuery addr =>
+                               doIt (fn () =>
+                                        case checkAddr addr of
+                                            NONE => ("User tried to query SA filtering for " ^ addr,
+                                                     SOME "You aren't allowed to configure SA filtering for that recipient.")
+                                          | SOME addr' => (Msg.send (bio, MsgSaStatus (SetSA.query addr'));
+                                                           ("Queried SA filtering status for " ^ addr,
+                                                            NONE)))
+                                    (fn () => ())
+
+                             | MsgSaSet (addr, b) =>
+                               doIt (fn () =>
+                                        case checkAddr addr of
+                                            NONE => ("User tried to set SA filtering for " ^ addr,
+                                                     SOME "You aren't allowed to configure SA filtering for that recipient.")
+                                          | SOME addr' => (SetSA.set (addr', b);
+                                                           Msg.send (bio, MsgOk);
+                                                           ("Set SA filtering status for " ^ addr ^ " to "
+                                                            ^ (if b then "ON" else "OFF"),
+                                                            NONE)))
+                                    (fn () => ())
+
+                             | MsgSmtpLogReq domain =>
+                               doIt (fn () =>
+                                        if not (Domain.yourDomain domain) then
+                                            ("Unauthorized user tried to request SMTP logs for " ^ domain,
+                                             SOME "You aren't authorized to configure that domain.")
+                                        else
+                                            (SmtpLog.search (fn line => Msg.send (bio, MsgSmtpLogRes line))
+                                             domain;
+                                             ("Requested SMTP logs for " ^ domain,
+                                              NONE)))
+                               (fn () => ())
+
+                             | MsgQuery q =>
+                               doIt (fn () => (Msg.send (bio, answerQuery q);
+                                               (describeQuery q,
+                                                NONE)))
+                               (fn () => ())
+
                              | _ =>
                                doIt (fn () => ("Unexpected command",
                                                SOME "Unexpected command"))
@@ -816,6 +1184,7 @@ fun service () =
                            handle OpenSSL.OpenSSL _ => ();
                            loop ())
     in
+       print ("Domtool dispatcher starting up at " ^ now () ^ "\n");
        print "Listening for connections....\n";
        loop ();
        OpenSSL.shutdown sock
@@ -831,19 +1200,17 @@ fun slave () =
 
        val sock = OpenSSL.listen (context, Config.slavePort)
 
+       val _ = print ("Slave server starting at " ^ now () ^ "\n")
+
        fun loop () =
            case OpenSSL.accept sock of
                NONE => ()
              | SOME bio =>
                let
                    val peer = OpenSSL.peerCN bio
-                   val () = print ("\nConnection from " ^ peer ^ "\n")
+                   val () = print ("\nConnection from " ^ peer ^ " at " ^ now () ^ "\n")
                in
-                   if peer <> Config.dispatcherName then
-                       (print "Not authorized!\n";
-                        OpenSSL.close bio;
-                        loop ())
-                   else let
+                   if peer = Config.dispatcherName then let
                            fun loop' files =
                                case Msg.recv bio of
                                    NONE => print "Dispatcher closed connection unexpectedly\n"
@@ -862,6 +1229,21 @@ fun slave () =
                            OpenSSL.close bio;
                            loop ()
                        end
+                   else if peer = "domtool" then
+                       case Msg.recv bio of
+                           SOME MsgShutdown => (OpenSSL.close bio;
+                                                print ("Shutting down at " ^ now () ^ "\n\n"))
+                         | _ => (OpenSSL.close bio;
+                                 loop ())
+                   else
+                       case Msg.recv bio of
+                           SOME (MsgQuery q) => (print (describeQuery q ^ "\n");
+                                                 Msg.send (bio, answerQuery q);
+                                                 ignore (OpenSSL.readChar bio);
+                                                 OpenSSL.close bio;
+                                                 loop ())
+                         | _ => (OpenSSL.close bio;
+                                 loop ())
                end handle OpenSSL.OpenSSL s =>
                           (print ("OpenSSL error: "^ s ^ "\n");
                            OpenSSL.close bio