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emqx
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Merge pull request #9387 from lafirest/fix/ctl_atom_leak 

chore: make remsh node name away from the atom DOS attack
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lafirest 2022-11-17 19:17:18 +08:00 committed by GitHub
parent 8e87bd625d c430218e26
commit 4dd34d11cd
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2 changed files with 8 additions and 3 deletions
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2
bin/emqx
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@ -396,7 +396,7 @@ remsh() {
# Generate a random id
relx_gen_id() {
od -t x -N 4 /dev/urandom | head -n1 | awk '{print $2}'
od -t u -N 4 /dev/urandom | head -n1 | awk '{print $2 % 1000}'
}
call_nodetool() {

9
bin/nodetool
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@ -226,9 +226,14 @@ nodename(Name) ->
this_node_name(longnames, Name) ->
[Node, Host] = re:split(Name, "@", [{return, list}, unicode]),
list_to_atom(lists:concat(["remsh_maint_", Node, os:getpid(), "@", Host]));
list_to_atom(lists:concat(["remsh_maint_", Node, node_name_suffix_id(), "@", Host]));
this_node_name(shortnames, Name) ->
list_to_atom(lists:concat(["remsh_maint_", Name, os:getpid()])).
list_to_atom(lists:concat(["remsh_maint_", Name, node_name_suffix_id()])).
%% use the reversed value that from pid mod 1000 as the node name suffix
node_name_suffix_id() ->
Pid = os:getpid(),
string:slice(string:reverse(Pid), 0, 3).
%% For windows???
create_mnesia_dir(DataDir, NodeName) ->