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gluon-authorized-keys: add unauthorized_keys to remove access #2782

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gluon-authorized-keys: add unauthorized_keys to remove access #2782

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c4ab768
gluon-authorized-keys: add unauthorized_keys to remove access
mkg20001 Dec 13, 2022
f9b0b62
gluon-authorized-keys: document unauthorized-keys
mkg20001 Feb 5, 2023
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10 changes: 10 additions & 0 deletions docs/features/authorized-keys.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -13,3 +13,13 @@ If you select this package, add a list of authorized keys to ``site.conf`` like
...

Existing keys in ``/etc/dropbear/authorized_keys`` will be preserved.

If you want to remove specific keys in the future, specify them like this:::
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Take note here that this will also remove SSH key which are originally added by the user.


{
unauthorized_keys = { 'ssh-rsa AAA.... user1@host',
'ssh-rsa AAA.... user2@host' },
authorized_keys = { 'ssh-rsa AAA.... user3@host',
'ssh-rsa AAA.... user4@host' },
hostname_prefix = ...
...
1 change: 1 addition & 0 deletions package/gluon-authorized-keys/check_site.lua
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@@ -1 +1,2 @@
need_string_array(in_site({'authorized_keys'}))
need_string_array(in_site({'unauthorized_keys'}), false)
12 changes: 11 additions & 1 deletion package/gluon-authorized-keys/luasrc/lib/gluon/upgrade/100-authorized-keys
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Expand Up @@ -4,19 +4,29 @@ local site = require 'gluon.site'
local file = '/etc/dropbear/authorized_keys'

local keys = {}
local rm_keys = {}

local function load_keys()
for line in io.lines(file) do
keys[line] = true
end
end

for _, key in ipairs(site.unauthorized_keys({})) do
rm_keys[key] = true
end

pcall(load_keys)

local f = io.open(file, 'a')
local f = io.open(file, 'w')
for _, key in ipairs(site.authorized_keys()) do
if not keys[key] then
f:write(key .. '\n')
end
end
for key, _ in pairs(keys) do
if not rm_keys[key] then
f:write(key .. '\n')
end
end
f:close()