1
1
/* -*- coding: utf-8 -*- */
3
* Passprompt - Read a password from the terminal and print it
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
3
* Password-prompt - Read a password from the terminal and print it
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
36
37
#include <stddef.h> /* NULL, size_t, ssize_t */
37
38
#include <sys/types.h> /* ssize_t */
38
39
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
40
getopt_long, getenv() */
40
41
#include <stdio.h> /* fprintf(), stderr, getline(),
41
42
stdin, feof(), perror(), fputc(),
42
43
stdout, getopt_long */
50
51
ARGP_KEY_ARG, ARGP_KEY_END,
51
52
ARGP_ERR_UNKNOWN */
53
volatile bool quit_now = false;
54
volatile sig_atomic_t quit_now = 0;
54
55
bool debug = false;
55
const char *argp_program_version = "passprompt 0.9";
56
const char *argp_program_version = "password-prompt " VERSION;
56
57
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
58
59
static void termination_handler(__attribute__((unused))int signum){
62
63
int main(int argc, char **argv){
73
74
struct argp_option options[] = {
74
75
{ .name = "prefix", .key = 'p',
75
76
.arg = "PREFIX", .flags = 0,
76
.doc = "Prefix used before the passprompt", .group = 2 },
77
.doc = "Prefix shown before the prompt", .group = 2 },
77
78
{ .name = "debug", .key = 128,
78
79
.doc = "Debug mode", .group = 3 },
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. */
83
error_t parse_opt (int key, char *arg, struct argp_state *state){
103
102
struct argp argp = { .options = options, .parser = parse_opt,
105
.doc = "Mandos Passprompt -- Provides a passprompt" };
106
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
107
if (ret == ARGP_ERR_UNKNOWN){
108
perror("argp_parse");
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");
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){
121
122
return EXIT_FAILURE;
167
168
fprintf(stderr, "Removing echo flag from terminal attributes\n");
171
172
t_new.c_lflag &= ~ECHO;
172
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
173
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
173
174
perror("tcsetattr-echo");
174
175
return EXIT_FAILURE;
178
179
fprintf(stderr, "Waiting for input from stdin \n");
184
fprintf(stderr, "Interrupted by signal, exiting.\n");
182
186
status = EXIT_FAILURE;
187
fprintf(stderr, "%s Password: ", prefix);
189
fprintf(stderr, "Password: ");
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,
191
213
ret = getline(&buffer, &n, stdin);
193
fprintf(stdout, "%s", buffer);
194
215
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;
198
if (errno != EINTR and not feof(stdin)){
236
if(errno != EINTR and not feof(stdin)){
199
237
perror("getline");
200
238
status = EXIT_FAILURE;
204
242
/* if(ret == 0), then the only sensible thing to do is to retry to
205
243
read from stdin */
206
244
fputc('\n', stderr);
245
if(debug and quit_now == 0){
246
/* If quit_now is nonzero, 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");
210
255
fprintf(stderr, "Restoring terminal attributes\n");
212
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
257
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
213
258
perror("tcsetattr+echo");
217
fprintf(stderr, "%s is exiting\n", argv[0]);
262
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
265
if(status == EXIT_SUCCESS){