I have an ssh server that has a user named newuser. When bash starts, I run this Lua script.
Code:
log = io.open("/etc/.users_created", "W")
os.execute("clear")
print("Welcome to Closet Server!")
print("------------------------------")
io.write("What's your full name? (Type n! is you don't want to): ")
fullName = io.read()
io.write("What will your login be?: ")
login = io.read()
io.write("What will your password be?: ")
passwd = io.read("*")
io.write("One more thing. Who is Brett's favorite pokemon?: ")
verify = io.read()
if string.lower(verify) == "*" then
print()
print("Okay! Please wait, we are creating your account")
os.execute([[sudo useradd ]] ..login.. [[ -p ]] ..password.. [[ -m]])
log.write([[Full Name: ]] ..fullName.. [[/nUser: ]] ..login.. [[/nPasswd: ]] ..passwd.. [[/n/n]])
print("You are now a user on Closet Server! Press enter to logout.")
io.read()
else
print()
print("You did not verify correctly.")
print("GTFO.")
print("Press enter to logout.")
io.read()
end
os.execute("exit")
Don't worry about the verify == "*". I just blocked out the verification keyword. Anyways, the error I get is:
Code:
lua: newuser_script:11: bad argument #1 to `read' (invalid format)
stack traceback:
[C]: in function `read'
newuser_script:11: in main chunk
[C]: ?
What's up with that?
That's because io.read("*") is not valid. Some valid options are "*all", "*line", "*number", or a number constant to denote how many characters would be read.
http://www.lua.org/pil/21.1.html
Hmm. I was trying to display the characters as asterisks not plaintext. I should stop playing Tekkit
Anyways, how would I get the correct characters but not display them?
A quick Google search says that basically, you can't. Here's the StackOverflow thread that seems relevant to your question:
http://stackoverflow.com/questions/8748228/password-input-function-in-lua
I don't know how to do this in Lua, but you could make it so that it reads the password like sudo or su, i.e. without showing the characters or anything to represent the characters.
souvik1997 wrote:
I don't know how to do this in Lua, but you could make it so that it reads the password like sudo or su, i.e. without showing the characters or anything to represent the characters.
Indeed, I thought of that as well, but based on the StackOverflow question (which includes a clause about that possibility) I figured it was impossible in Lua.
You might want to consider using a Lua binding of the Curses or NCurses library, which is small and supports raw key input. Or, if this isn't meant to be portable between system, abuse of the os.execute() command provided with a shell command that would take input like such would also work.
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