1
1
/* -*- coding: utf-8 -*- */
3
* Password-prompt - Read a password from the terminal and print it
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
3
* Passprompt - Read a password from the terminal and print it
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
37
36
#include <stddef.h> /* NULL, size_t, ssize_t */
38
37
#include <sys/types.h> /* ssize_t */
39
38
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
40
getopt_long, getenv() */
41
40
#include <stdio.h> /* fprintf(), stderr, getline(),
42
41
stdin, feof(), perror(), fputc(),
43
42
stdout, getopt_long */
54
53
volatile bool quit_now = false;
55
54
bool debug = false;
56
const char *argp_program_version = "password-prompt " VERSION;
55
const char *argp_program_version = "passprompt 1.0";
57
56
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
59
58
static void termination_handler(__attribute__((unused))int signum){
74
73
struct argp_option options[] = {
75
74
{ .name = "prefix", .key = 'p',
76
75
.arg = "PREFIX", .flags = 0,
77
.doc = "Prefix shown before the prompt", .group = 2 },
76
.doc = "Prefix used before the passprompt", .group = 2 },
78
77
{ .name = "debug", .key = 128,
79
78
.doc = "Debug mode", .group = 3 },
83
82
error_t parse_opt (int key, char *arg, struct argp_state *state) {
83
/* Get the INPUT argument from `argp_parse', which we know is a
84
pointer to our plugin list pointer. */
102
103
struct argp argp = { .options = options, .parser = parse_opt,
104
.doc = "Mandos password-prompt -- Read and"
105
" output a password" };
106
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
107
if(ret == ARGP_ERR_UNKNOWN){
108
fprintf(stderr, "Unknown error while parsing arguments\n");
105
.doc = "Mandos Passprompt -- Provides a passprompt" };
106
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
107
if (ret == ARGP_ERR_UNKNOWN){
108
fprintf(stderr, "Unkown error while parsing arguments\n");
109
109
return EXIT_FAILURE;
114
114
fprintf(stderr, "Starting %s\n", argv[0]);
117
117
fprintf(stderr, "Storing current terminal attributes\n");
120
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
120
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
122
121
return EXIT_FAILURE;
168
167
fprintf(stderr, "Removing echo flag from terminal attributes\n");
172
171
t_new.c_lflag &= ~ECHO;
173
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
172
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
174
173
perror("tcsetattr-echo");
175
174
return EXIT_FAILURE;
179
178
fprintf(stderr, "Waiting for input from stdin \n");
184
fprintf(stderr, "Interrupted by signal, exiting.\n");
186
182
status = EXIT_FAILURE;
191
fprintf(stderr, "%s ", prefix);
194
const char *cryptsource = getenv("cryptsource");
195
const char *crypttarget = getenv("crypttarget");
196
const char *const prompt
197
= "Enter passphrase to unlock the disk";
198
if(cryptsource == NULL){
199
if(crypttarget == NULL){
200
fprintf(stderr, "%s: ", prompt);
202
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
205
if(crypttarget == NULL){
206
fprintf(stderr, "%s %s: ", prompt, cryptsource);
208
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
187
fprintf(stderr, "%s Password: ", prefix);
189
fprintf(stderr, "Password: ");
213
191
ret = getline(&buffer, &n, stdin);
193
fprintf(stdout, "%s", buffer);
215
194
status = EXIT_SUCCESS;
216
/* Make n = data size instead of allocated buffer size */
218
/* Strip final newline */
219
if(n>0 and buffer[n-1] == '\n'){
220
buffer[n-1] = '\0'; /* not strictly necessary */
225
ret = write(STDOUT_FILENO, buffer + written, n - written);
228
status = EXIT_FAILURE;
231
written += (size_t)ret;
236
if(errno != EINTR and not feof(stdin)){
198
if (errno != EINTR and not feof(stdin)){
237
199
perror("getline");
238
200
status = EXIT_FAILURE;
242
204
/* if(ret == 0), then the only sensible thing to do is to retry to
243
205
read from stdin */
244
206
fputc('\n', stderr);
245
if(debug and not quit_now){
246
/* If quit_now is true, we were interrupted by a signal, and
247
will print that later, so no need to show this too. */
248
fprintf(stderr, "getline() returned 0, retrying.\n");
255
210
fprintf(stderr, "Restoring terminal attributes\n");
257
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
212
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
258
213
perror("tcsetattr+echo");
262
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
265
if(status == EXIT_SUCCESS){
217
fprintf(stderr, "%s is exiting\n", argv[0]);