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Add LLVM openmp trunk r351319 (just before the release_80 branch point)
[FreeBSD/FreeBSD.git] / stand / lua / password.lua
1 --
2 -- SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 --
4 -- Copyright (c) 2015 Pedro Souza <pedrosouza@freebsd.org>
5 -- Copyright (C) 2018 Kyle Evans <kevans@FreeBSD.org>
6 -- All rights reserved.
7 --
8 -- Redistribution and use in source and binary forms, with or without
9 -- modification, are permitted provided that the following conditions
10 -- are met:
11 -- 1. Redistributions of source code must retain the above copyright
12 --    notice, this list of conditions and the following disclaimer.
13 -- 2. Redistributions in binary form must reproduce the above copyright
14 --    notice, this list of conditions and the following disclaimer in the
15 --    documentation and/or other materials provided with the distribution.
16 --
17 -- THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 -- ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 -- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 -- ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 -- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 -- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 -- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 -- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 -- LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 -- OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 -- SUCH DAMAGE.
28 --
29 -- $FreeBSD$
30 --
31
32 local core = require("core")
33 local screen = require("screen")
34
35 local password = {}
36
37 local INCORRECT_PASSWORD = "loader: incorrect password"
38 -- Asterisks as a password mask
39 local show_password_mask = false
40 local twiddle_chars = {"/", "-", "\\", "|"}
41 local screen_setup = false
42
43 -- Module exports
44 function password.read(prompt_length)
45         local str = ""
46         local twiddle_pos = 1
47
48         local function draw_twiddle()
49                 printc(twiddle_chars[twiddle_pos])
50                 -- Reset cursor to just after the password prompt
51                 screen.setcursor(prompt_length + 2, screen.default_y)
52                 twiddle_pos = (twiddle_pos % #twiddle_chars) + 1
53         end
54
55         -- Space between the prompt and any on-screen feedback
56         printc(" ")
57         while true do
58                 local ch = io.getchar()
59                 if ch == core.KEY_ENTER then
60                         break
61                 end
62                 if ch == core.KEY_BACKSPACE or ch == core.KEY_DELETE then
63                         if #str > 0 then
64                                 if show_password_mask then
65                                         printc("\008 \008")
66                                 else
67                                         draw_twiddle()
68                                 end
69                                 str = str:sub(1, #str - 1)
70                         end
71                 else
72                         if show_password_mask then
73                                 printc("*")
74                         else
75                                 draw_twiddle()
76                         end
77                         str = str .. string.char(ch)
78                 end
79         end
80         return str
81 end
82
83 function password.check()
84         -- pwd is optionally supplied if we want to check it
85         local function doPrompt(prompt, pwd)
86                 local attempts = 1
87
88                 local function clear_incorrect_text_prompt()
89                         printc("\r" .. string.rep(" ", #INCORRECT_PASSWORD))
90                 end
91
92                 if not screen_setup then
93                         screen.clear()
94                         screen.defcursor()
95                         screen_setup = true
96                 end
97
98                 while true do
99                         if attempts > 1 then
100                                 clear_incorrect_text_prompt()
101                         end
102                         screen.defcursor()
103                         printc(prompt)
104                         local read_pwd = password.read(#prompt)
105                         if pwd == nil or pwd == read_pwd then
106                                 -- Clear the prompt + twiddle
107                                 printc(string.rep(" ", #prompt + 5))
108                                 return read_pwd
109                         end
110                         printc("\n" .. INCORRECT_PASSWORD)
111                         attempts = attempts + 1
112                         loader.delay(3*1000*1000)
113                 end
114         end
115         local function compare(prompt, pwd)
116                 if pwd == nil then
117                         return
118                 end
119                 doPrompt(prompt, pwd)
120         end
121
122         local boot_pwd = loader.getenv("bootlock_password")
123         compare("Bootlock password:", boot_pwd)
124
125         local geli_prompt = loader.getenv("geom_eli_passphrase_prompt")
126         if geli_prompt ~= nil and geli_prompt:lower() == "yes" then
127                 local passphrase = doPrompt("GELI Passphrase:")
128                 loader.setenv("kern.geom.eli.passphrase", passphrase)
129         end
130
131         local pwd = loader.getenv("password")
132         if pwd ~= nil then
133                 core.autoboot()
134         end
135         compare("Loader password:", pwd)
136 end
137
138 return password