Good suggestions Mate. We are in progress to implement both (SSL AND SASL). Will try to pan out some destructive cases to test it out :)
On Tue, Jun 16, 2020, 4:07 AM Szalay-Bekő Máté <[email protected]> wrote: > Also the best is to use QuorumSASL or QuorumSSL to make sure the ZooKeeper > server-to-server communication is secure and noone who is not trusted can > connect and gain access to the quorum. > > However, if one is using QuorumSASL or QuorumSSL then it is still possible > that a DOS attack can hit the ZooKeeper port causing problems. But that can > again be solved by firewalls I think. > > On Tue, Jun 16, 2020 at 12:49 PM Szalay-Bekő Máté < > [email protected]> wrote: > > > > Mate, suppose we do set quorumListenOnAllIPs to true. Will the > zookeeper > > still connect and form a quorum with only the static or dynamic server > > connection strings or it can connect and form a quorum with any IP > address > > outside the server connection strings as it is allowed to bind with a > > 0.0.0.0 interface? > > > > This is a good question. I think there is a chance that one can "intrude" > > this way. Although I wouldn't give more tips on the mailing list. :) > > The best is to protect the ZooKeeper internal network using firewalls. > The > > election port and leader port should be reachable only by other ZooKeeper > > server hosts. > > > > Regards, > > Mate > > > > On Tue, Jun 16, 2020 at 12:24 PM ashish soni <[email protected] > > > > wrote: > > > >> Hi, > >> > >> Mate, suppose we do set quorumListenOnAllIPs to true. Will the zookeeper > >> still connect and form a quorum with only the static or dynamic server > >> connection strings or it can connect and form a quorum with any IP > address > >> outside the server connection strings as it is allowed to bind with a > >> 0.0.0.0 interface? > >> > >> Ram, I think you don't need to add this if you have a static IP config > or > >> using 3.6+. If you feel it is a security issue for the organization, try > >> ZK > >> 3.6.1 without setting that config. > >> > >> Regards, > >> Aishwarya Soni > >> > >> On Tue, Jun 16, 2020 at 1:03 AM Szalay-Bekő Máté < > >> [email protected]> > >> wrote: > >> > >> > Hi Ram, > >> > > >> > > all i want to know is by enabling this property there are no side > >> effects > >> > or security risks. > >> > > >> > well, this is something for you (or for your security team) to > evaluate. > >> > E.g. if your hosts have multiple network interfaces with both > "private" > >> and > >> > "public" networks attached, then I can consider setting > >> > quorumListenOnAllIPs=true to be a security risk. Of course you can > block > >> > the public access with proper firewall rules. > >> > > >> > But usually ZooKeeper is deployed in some secure / core > infrastructure, > >> > well protected from DOS / other attacks, in which > >> > case quorumListenOnAllIPs=true is not a real security risk. > >> > > >> > This is something we (the ZooKeeper community) will not be able to > >> tell, as > >> > this depends on your network topology and your security protocols. We > >> can > >> > only help in explaining what this config is doing. > >> > > >> > Kind regards, > >> > Mate > >> > > >> > On Mon, Jun 15, 2020 at 7:12 PM rammohan ganapavarapu < > >> > [email protected]> wrote: > >> > > >> > > Mate, > >> > > > >> > > Thanks for explaining, all i want to know is by enabling this > property > >> > > there are no side effects or security risks. > >> > > > >> > > Ram > >> > > > >> > > On Sun, Jun 14, 2020 at 11:48 PM Szalay-Bekő Máté < > >> > > [email protected]> wrote: > >> > > > >> > > > Hi Ram, > >> > > > > >> > > > I am not sure I understand your question. The config > >> > quorumListenOnAllIPs > >> > > > is about to specify if the ports ZooKeeper uses for > Server-to-server > >> > > > communication should bind on the specified address/IP > >> > > > (quorumListenOnAllIPs=false) or on 0.0.0.0 > >> (quorumListenOnAllIPs=true). > >> > > > > >> > > > An example: You configure your server list using either static or > >> > dynamic > >> > > > configuration like: > >> > > > server.1=a.foo.com:2888:3888 > >> > > > server.2=b.foo.com:2888:3888 > >> > > > ... > >> > > > > >> > > > In this case when server.2 starts, it reads the config then > >> initiates > >> > > > connection (for ZK internal leader election protocol) to server.1 > by > >> > > > connecting to a.foo.com:3888 and sending it's own address ( > >> > > b.foo.com:3888) > >> > > > enabling server.1 to connect back. However, if server.2 is behind > a > >> > > proxy / > >> > > > using kubernetes / whatever, then it is possible that you can > reach > >> > > > server.2 as b.foo.com but the ZK process on server.2 can not > >> actually > >> > > bind > >> > > > on b.foo.com:3888. In this case the easiest solution is to bind > on > >> > > > 0.0.0.0:3888. However, you can not set 0.0.0.0:3888 in the config > >> file > >> > > of > >> > > > server 2, since in this case server.2 would send 0.0.0.0:3888 in > >> the > >> > > > initial message to server.1 and server.1 would try to connect back > >> to > >> > > > server.2 using 0.0.0.0:3888 what is a bad idea. So in this case > it > >> > comes > >> > > > handy to set quorumListenOnAllIPs=true which will cause ZooKeeper > to > >> > bind > >> > > > on 0.0.0.0:3888 and still send a 'valid' address in the initial > >> > message, > >> > > > an > >> > > > address where other servers can reach it. > >> > > > > >> > > > I hope the explanation made it more (and not less) clear :p > >> > > > > >> > > > Kind regards, > >> > > > Mate > >> > > > > >> > > > > >> > > > On Fri, Jun 12, 2020 at 7:42 PM rammohan ganapavarapu < > >> > > > [email protected]> wrote: > >> > > > > >> > > > > Hi, > >> > > > > > >> > > > > I am trying to see what are the pros and cons of setting > >> > > > > quorumListenOnAllIPs to true. Running zookeeper cluster in mtls > or > >> > > local > >> > > > > proxy environments is not working by keeping default value > >> (false). > >> > So > >> > > > can > >> > > > > someone please explain? > >> > > > > > >> > > > > Any way zookeeper will form quorum with the servers list from > the > >> > > > zoo.conf > >> > > > > static file right? so by enabling this property can any server > or > >> IP > >> > > out > >> > > > of > >> > > > > the zoo.conf can join the quorum? > >> > > > > > >> > > > > Ram > >> > > > > > >> > > > > >> > > > >> > > >> > > >
