57 lines
1.4 KiB
Plaintext
57 lines
1.4 KiB
Plaintext
--:Minify:--
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local targetUser = ({ ... })[1] or "root"
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local currentUid = syscall.getuid()
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local targetUid = syscall.getuidbyname(targetUser)
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if not targetUid then
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print("su: user '" .. targetUser .. "' does not exist")
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syscall.exit(1)
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return
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end
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if currentUid ~= 0 then
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printInline("Password: ")
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local pw = ""
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while true do
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local ch = syscall.read(0)
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if not ch or ch == "" then
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elseif ch == "\n" then
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syscall.write(1, "\n")
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break
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elseif ch == "\b" then
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if #pw > 0 then pw = pw:sub(1, -2); syscall.write(1, "\b \b") end
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else
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pw = pw .. ch; syscall.write(1, "*")
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end
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end
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local ok, err = syscall.elevate(targetUser, pw)
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if not ok then
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sleep(1)
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print("su: Authentication failure")
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syscall.exit(1)
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return
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end
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end
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syscall.setuid(targetUid)
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local pwent = syscall.getpasswd(targetUid)
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local shell = (pwent and pwent.shell) or "/bin/hysh"
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local homedir = (pwent and pwent.homedir) or "/"
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local ok_cd, err_cd = pcall(syscall.chdir, homedir)
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if not ok_cd then
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homedir = "/"
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syscall.chdir(homedir)
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end
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syscall.setEnviron("HOME", homedir)
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syscall.setEnviron("USER", targetUser)
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syscall.setEnviron("SHELL", shell)
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local ok, err = pcall(syscall.exec, shell)
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if not ok then
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print("su: cannot exec shell '" .. shell .. "': " .. tostring(err))
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syscall.exit(1)
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end
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