1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
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
33
32
#include <signal.h> /* sig_atomic_t, raise(), struct
34
33
sigaction, sigemptyset(),
35
34
sigaction(), sigaddset(), SIGINT,
36
SIGQUIT, SIGHUP, SIGTERM,
35
SIGQUIT, SIGHUP, SIGTERM */
38
36
#include <stddef.h> /* NULL, size_t, ssize_t */
39
37
#include <sys/types.h> /* ssize_t */
40
38
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
41
getopt_long, getenv() */
42
40
#include <stdio.h> /* fprintf(), stderr, getline(),
43
41
stdin, feof(), perror(), fputc(),
44
42
stdout, getopt_long */
52
50
ARGP_KEY_ARG, ARGP_KEY_END,
53
51
ARGP_ERR_UNKNOWN */
55
volatile sig_atomic_t quit_now = 0;
53
volatile bool quit_now = false;
57
54
bool debug = false;
58
const char *argp_program_version = "password-prompt " VERSION;
55
const char *argp_program_version = "passprompt 1.0";
59
56
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
61
static void termination_handler(int signum){
66
signal_received = signum;
58
static void termination_handler(__attribute__((unused))int signum){
69
62
int main(int argc, char **argv){
80
73
struct argp_option options[] = {
81
74
{ .name = "prefix", .key = 'p',
82
75
.arg = "PREFIX", .flags = 0,
83
.doc = "Prefix shown before the prompt", .group = 2 },
76
.doc = "Prefix used before the passprompt", .group = 2 },
84
77
{ .name = "debug", .key = 128,
85
78
.doc = "Debug mode", .group = 3 },
89
error_t parse_opt (int key, char *arg, struct argp_state *state){
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. */
108
103
struct argp argp = { .options = options, .parser = parse_opt,
110
.doc = "Mandos password-prompt -- Read and"
111
" output a password" };
112
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
113
if(ret == ARGP_ERR_UNKNOWN){
114
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");
115
109
return EXIT_FAILURE;
120
114
fprintf(stderr, "Starting %s\n", argv[0]);
123
117
fprintf(stderr, "Storing current terminal attributes\n");
126
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
120
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
128
121
return EXIT_FAILURE;
131
124
sigemptyset(&new_action.sa_mask);
132
ret = sigaddset(&new_action.sa_mask, SIGINT);
137
ret = sigaddset(&new_action.sa_mask, SIGHUP);
142
ret = sigaddset(&new_action.sa_mask, SIGTERM);
147
/* Need to check if the handler is SIG_IGN before handling:
148
| [[info:libc:Initial Signal Actions]] |
149
| [[info:libc:Basic Signal Handling]] |
125
sigaddset(&new_action.sa_mask, SIGINT);
126
sigaddset(&new_action.sa_mask, SIGHUP);
127
sigaddset(&new_action.sa_mask, SIGTERM);
151
128
ret = sigaction(SIGINT, NULL, &old_action);
153
130
perror("sigaction");
154
131
return EXIT_FAILURE;
156
if(old_action.sa_handler != SIG_IGN){
133
if (old_action.sa_handler != SIG_IGN){
157
134
ret = sigaction(SIGINT, &new_action, NULL);
159
136
perror("sigaction");
190
167
fprintf(stderr, "Removing echo flag from terminal attributes\n");
194
171
t_new.c_lflag &= ~ECHO;
195
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
172
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
196
173
perror("tcsetattr-echo");
197
174
return EXIT_FAILURE;
201
178
fprintf(stderr, "Waiting for input from stdin \n");
206
fprintf(stderr, "Interrupted by signal, exiting.\n");
208
182
status = EXIT_FAILURE;
213
fprintf(stderr, "%s ", prefix);
216
const char *cryptsource = getenv("cryptsource");
217
const char *crypttarget = getenv("crypttarget");
218
const char *const prompt
219
= "Enter passphrase to unlock the disk";
220
if(cryptsource == NULL){
221
if(crypttarget == NULL){
222
fprintf(stderr, "%s: ", prompt);
224
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
227
if(crypttarget == NULL){
228
fprintf(stderr, "%s %s: ", prompt, cryptsource);
230
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
187
fprintf(stderr, "%s Password: ", prefix);
189
fprintf(stderr, "Password: ");
235
191
ret = getline(&buffer, &n, stdin);
193
fprintf(stdout, "%s", buffer);
237
194
status = EXIT_SUCCESS;
238
/* Make n = data size instead of allocated buffer size */
240
/* Strip final newline */
241
if(n>0 and buffer[n-1] == '\n'){
242
buffer[n-1] = '\0'; /* not strictly necessary */
247
ret = write(STDOUT_FILENO, buffer + written, n - written);
250
status = EXIT_FAILURE;
253
written += (size_t)ret;
258
if(errno != EINTR and not feof(stdin)){
198
if (errno != EINTR and not feof(stdin)){
259
199
perror("getline");
260
200
status = EXIT_FAILURE;
264
204
/* if(ret == 0), then the only sensible thing to do is to retry to
265
205
read from stdin */
266
206
fputc('\n', stderr);
267
if(debug and not quit_now){
268
/* If quit_now is nonzero, we were interrupted by a signal, and
269
will print that later, so no need to show this too. */
270
fprintf(stderr, "getline() returned 0, retrying.\n");
277
210
fprintf(stderr, "Restoring terminal attributes\n");
279
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
212
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
280
213
perror("tcsetattr+echo");
284
sigemptyset(&old_action.sa_mask);
285
old_action.sa_handler = SIG_DFL;
286
ret = sigaction(signal_received, &old_action, NULL);
290
raise(signal_received);
294
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
297
if(status == EXIT_SUCCESS){
217
fprintf(stderr, "%s is exiting\n", argv[0]);
added
removed
plugins.d/password-prompt.c
