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
34
33
sigaction, sigemptyset(),
35
34
sigaction(), sigaddset(), SIGINT,
36
35
SIGQUIT, SIGHUP, SIGTERM */
37
#include <stddef.h> /* NULL, size_t, ssize_t */
36
#include <stddef.h> /* NULL, size_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 */
45
44
#include <iso646.h> /* or, not */
46
45
#include <stdbool.h> /* bool, false, true */
47
46
#include <string.h> /* strlen, rindex, strncmp, strcmp */
48
#include <argp.h> /* struct argp_option, struct
49
argp_state, struct argp,
50
argp_parse(), error_t,
51
ARGP_KEY_ARG, ARGP_KEY_END,
47
#include <getopt.h> /* getopt_long */
54
49
volatile bool quit_now = false;
55
50
bool debug = false;
56
const char *argp_program_version = "password-prompt " VERSION;
57
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
59
static void termination_handler(__attribute__((unused))int signum){
52
void termination_handler(__attribute__((unused))int signum){
70
63
struct sigaction old_action,
71
64
new_action = { .sa_handler = termination_handler,
74
struct argp_option options[] = {
75
{ .name = "prefix", .key = 'p',
76
.arg = "PREFIX", .flags = 0,
77
.doc = "Prefix shown before the prompt", .group = 2 },
78
{ .name = "debug", .key = 128,
79
.doc = "Debug mode", .group = 3 },
83
error_t parse_opt (int key, char *arg, struct argp_state *state) {
84
/* Get the INPUT argument from `argp_parse', which we know is a
85
pointer to our plugin list pointer. */
99
return ARGP_ERR_UNKNOWN;
68
static struct option long_options[] = {
69
{"debug", no_argument, (int *)&debug, 1},
70
{"prefix", required_argument, 0, 'p'},
74
ret = getopt_long (argc, argv, "p:", long_options, &option_index);
104
struct argp argp = { .options = options, .parser = parse_opt,
106
.doc = "Mandos password-prompt -- Read and"
107
" output a password" };
108
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
109
if (ret == ARGP_ERR_UNKNOWN){
110
fprintf(stderr, "Unknown error while parsing arguments\n");
87
fprintf(stderr, "bad arguments\n");
116
93
fprintf(stderr, "Starting %s\n", argv[0]);
128
104
sigaddset(&new_action.sa_mask, SIGINT);
129
105
sigaddset(&new_action.sa_mask, SIGHUP);
130
106
sigaddset(&new_action.sa_mask, SIGTERM);
131
ret = sigaction(SIGINT, NULL, &old_action);
136
if (old_action.sa_handler != SIG_IGN){
137
ret = sigaction(SIGINT, &new_action, NULL);
143
ret = sigaction(SIGHUP, NULL, &old_action);
148
if (old_action.sa_handler != SIG_IGN){
149
ret = sigaction(SIGHUP, &new_action, NULL);
155
ret = sigaction(SIGTERM, NULL, &old_action);
160
if (old_action.sa_handler != SIG_IGN){
161
ret = sigaction(SIGTERM, &new_action, NULL);
107
sigaction(SIGINT, NULL, &old_action);
108
if (old_action.sa_handler != SIG_IGN)
109
sigaction(SIGINT, &new_action, NULL);
110
sigaction(SIGHUP, NULL, &old_action);
111
if (old_action.sa_handler != SIG_IGN)
112
sigaction(SIGHUP, &new_action, NULL);
113
sigaction(SIGTERM, NULL, &old_action);
114
if (old_action.sa_handler != SIG_IGN)
115
sigaction(SIGTERM, &new_action, NULL);
170
119
fprintf(stderr, "Removing echo flag from terminal attributes\n");
186
fprintf(stderr, "Interrupted by signal, exiting.\n");
188
134
status = EXIT_FAILURE;
193
fprintf(stderr, "%s ", prefix);
196
const char *cryptsource = getenv("cryptsource");
197
const char *crypttarget = getenv("crypttarget");
198
const char *const prompt
199
= "Enter passphrase to unlock the disk";
200
if(cryptsource == NULL){
201
if(crypttarget == NULL){
202
fprintf(stderr, "%s: ", prompt);
204
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
207
if(crypttarget == NULL){
208
fprintf(stderr, "%s %s: ", prompt, cryptsource);
210
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
139
fprintf(stderr, "%s Password: ", prefix);
141
fprintf(stderr, "Password: ");
215
143
ret = getline(&buffer, &n, stdin);
145
fprintf(stdout, "%s", buffer);
217
146
status = EXIT_SUCCESS;
218
/* Make n = data size instead of allocated buffer size */
220
/* Strip final newline */
221
if(n>0 and buffer[n-1] == '\n'){
222
buffer[n-1] = '\0'; /* not strictly necessary */
227
ret = write(STDOUT_FILENO, buffer + written, n - written);
230
status = EXIT_FAILURE;
233
written += (size_t)ret;
149
// ret == 0 makes no other sence than to retry to read from stdin
238
151
if (errno != EINTR and not feof(stdin)){
239
152
perror("getline");
244
/* if(ret == 0), then the only sensible thing to do is to retry to
246
157
fputc('\n', stderr);
247
if(debug and not quit_now){
248
/* If quit_now is true, we were interrupted by a signal, and
249
will print that later, so no need to show this too. */
250
fprintf(stderr, "getline() returned 0, retrying.\n");
257
161
fprintf(stderr, "Restoring terminal attributes\n");
259
163
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
260
164
perror("tcsetattr+echo");
264
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
267
if(status == EXIT_SUCCESS){
168
fprintf(stderr, "%s is exiting\n", argv[0]);