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stand/lua: Add optional GELI passphrase prompt

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Prompt for GELI passphrase when geom_eli_passphrase_prompt has been set to
"YES" in loader.conf(5).

This entailed breaking out the password prompt into its own function that
can be reused between the password compare bits and this prompt that simply
takes the entered password and passes it along in the environment as
kern.geom.eli.passphrase.

I've also added a TODO to re-evaluate later if we want the "password
masking" -- it is currently not functional, so one still can't observe the
length of the password typed at the prompt.
This commit is contained in:
Kyle Evans 2018-02-17 05:26:28 +00:00
parent 18c286a0ac
commit 11cac43197
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=329433
1 changed files with 21 additions and 7 deletions
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28
stand/lua/password.lua
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@ -40,7 +40,8 @@ function password.read()
if ch == core.KEY_ENTER then
break;
end
-- XXX TODO: Evaluate if we really want this or not, as a
-- security consideration of sorts
if (ch == core.KEY_BACKSPACE) or (ch == core.KEY_DELETE) then
if n > 0 then
n = n - 1;
@ -58,23 +59,36 @@ end
function password.check()
screen.defcursor();
local function compare(prompt, pwd)
if (pwd == nil) then
return;
end
-- pwd is optionally supplied if we want to check it
local function do_prompt(prompt, pwd)
while true do
loader.printc(prompt);
if (pwd == password.read()) then
break;
local read_pwd = password.read();
if (not pwd) or (pwd == read_pwd) then
return read_pwd;
end
print("\n\nloader: incorrect password!\n");
loader.delay(3*1000*1000);
end
-- Throw an extra newline out after the password prompt
print("")
end
local function compare(prompt, pwd)
if (pwd == nil) then
return;
end
do_prompt(prompt, pwd);
end
local boot_pwd = loader.getenv("bootlock_password");
compare("Boot password: ", boot_pwd);
local geli_pass_prompt = loader.getenv("geom_eli_passphrase_prompt");
if (geli_pass_prompt:lower() == "yes") then
local passphrase = do_prompt("GELI Passphrase: ");
loader.setenv("kern.geom.eli.passphrase", passphrase)
end
local pwd = loader.getenv("password");
if (pwd ~=nil) then
core.autoboot();