32
33
#include <signal.h> /* sig_atomic_t, raise(), struct
33
34
sigaction, sigemptyset(),
34
35
sigaction(), sigaddset(), SIGINT,
35
SIGQUIT, SIGHUP, SIGTERM,
36
SIGQUIT, SIGHUP, SIGTERM */
37
37
#include <stddef.h> /* NULL, size_t, ssize_t */
38
38
#include <sys/types.h> /* ssize_t */
39
39
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
40
getopt_long, getenv() */
41
41
#include <stdio.h> /* fprintf(), stderr, getline(),
42
stdin, feof(), perror(), fputc()
44
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
45
EFAULT, EFBIG, EIO, ENOSPC, EINTR
42
stdin, feof(), perror(), fputc(),
43
stdout, getopt_long */
44
#include <errno.h> /* errno, EINVAL */
47
45
#include <iso646.h> /* or, not */
48
46
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strlen, rindex */
47
#include <string.h> /* strlen, rindex, strncmp, strcmp */
50
48
#include <argp.h> /* struct argp_option, struct
51
49
argp_state, struct argp,
52
50
argp_parse(), error_t,
53
51
ARGP_KEY_ARG, ARGP_KEY_END,
54
52
ARGP_ERR_UNKNOWN */
55
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
56
EX_UNAVAILABLE, EX_IOERR, EX_OK */
58
volatile sig_atomic_t quit_now = 0;
54
volatile bool quit_now = false;
60
55
bool debug = false;
61
56
const char *argp_program_version = "password-prompt " VERSION;
62
57
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
64
static void termination_handler(int signum){
69
signal_received = signum;
59
static void termination_handler(__attribute__((unused))int signum){
72
63
int main(int argc, char **argv){
86
77
.doc = "Prefix shown before the prompt", .group = 2 },
87
78
{ .name = "debug", .key = 128,
88
79
.doc = "Debug mode", .group = 3 },
90
* These reproduce what we would get without ARGP_NO_HELP
92
{ .name = "help", .key = '?',
93
.doc = "Give this help list", .group = -1 },
94
{ .name = "usage", .key = -3,
95
.doc = "Give a short usage message", .group = -1 },
96
{ .name = "version", .key = 'V',
97
.doc = "Print program version", .group = -1 },
101
error_t parse_opt (int key, char *arg, struct argp_state *state){
83
error_t parse_opt (int key, char *arg, struct argp_state *state) {
111
* These reproduce what we would get without ARGP_NO_HELP
113
case '?': /* --help */
114
argp_state_help(state, state->out_stream,
115
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
116
& ~(unsigned int)ARGP_HELP_EXIT_OK);
117
case -3: /* --usage */
118
argp_state_help(state, state->out_stream,
119
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
120
case 'V': /* --version */
121
fprintf(state->out_stream, "%s\n", argp_program_version);
122
exit(argp_err_exit_status);
125
97
return ARGP_ERR_UNKNOWN;
130
102
struct argp argp = { .options = options, .parser = parse_opt,
132
104
.doc = "Mandos password-prompt -- Read and"
133
105
" output a password" };
134
ret = argp_parse(&argp, argc, argv,
135
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
142
perror("argp_parse");
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");
150
114
fprintf(stderr, "Starting %s\n", argv[0]);
153
117
fprintf(stderr, "Storing current terminal attributes\n");
156
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
120
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
158
121
perror("tcgetattr");
162
return EX_UNAVAILABLE;
168
125
sigemptyset(&new_action.sa_mask);
169
ret = sigaddset(&new_action.sa_mask, SIGINT);
174
ret = sigaddset(&new_action.sa_mask, SIGHUP);
179
ret = sigaddset(&new_action.sa_mask, SIGTERM);
184
/* Need to check if the handler is SIG_IGN before handling:
185
| [[info:libc:Initial Signal Actions]] |
186
| [[info:libc:Basic Signal Handling]] |
126
sigaddset(&new_action.sa_mask, SIGINT);
127
sigaddset(&new_action.sa_mask, SIGHUP);
128
sigaddset(&new_action.sa_mask, SIGTERM);
188
129
ret = sigaction(SIGINT, NULL, &old_action);
190
131
perror("sigaction");
193
if(old_action.sa_handler != SIG_IGN){
134
if (old_action.sa_handler != SIG_IGN){
194
135
ret = sigaction(SIGINT, &new_action, NULL);
196
137
perror("sigaction");
200
141
ret = sigaction(SIGHUP, NULL, &old_action);
202
143
perror("sigaction");
205
if(old_action.sa_handler != SIG_IGN){
146
if (old_action.sa_handler != SIG_IGN){
206
147
ret = sigaction(SIGHUP, &new_action, NULL);
208
149
perror("sigaction");
212
153
ret = sigaction(SIGTERM, NULL, &old_action);
214
155
perror("sigaction");
217
if(old_action.sa_handler != SIG_IGN){
158
if (old_action.sa_handler != SIG_IGN){
218
159
ret = sigaction(SIGTERM, &new_action, NULL);
220
161
perror("sigaction");
227
168
fprintf(stderr, "Removing echo flag from terminal attributes\n");
231
t_new.c_lflag &= ~(tcflag_t)ECHO;
232
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
172
t_new.c_lflag &= ~ECHO;
173
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
234
174
perror("tcsetattr-echo");
238
return EX_UNAVAILABLE;
246
179
fprintf(stderr, "Waiting for input from stdin \n");
251
184
fprintf(stderr, "Interrupted by signal, exiting.\n");
258
191
fprintf(stderr, "%s ", prefix);
261
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
262
const char *crypttarget = getenv("CRYPTTAB_NAME");
263
/* Before cryptsetup 1.1.0~rc2 */
264
if(cryptsource == NULL){
265
cryptsource = getenv("cryptsource");
267
if(crypttarget == NULL){
268
crypttarget = getenv("crypttarget");
270
const char *const prompt1 = "Unlocking the disk";
271
const char *const prompt2 = "Enter passphrase";
194
const char *cryptsource = getenv("cryptsource");
195
const char *crypttarget = getenv("crypttarget");
196
const char *const prompt
197
= "Enter passphrase to unlock the disk";
272
198
if(cryptsource == NULL){
273
199
if(crypttarget == NULL){
274
fprintf(stderr, "%s to unlock the disk: ", prompt2);
200
fprintf(stderr, "%s: ", prompt);
276
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
202
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
280
205
if(crypttarget == NULL){
281
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
206
fprintf(stderr, "%s %s: ", prompt, cryptsource);
284
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
285
crypttarget, prompt2);
208
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
289
213
ret = getline(&buffer, &n, stdin);
291
215
status = EXIT_SUCCESS;
292
216
/* Make n = data size instead of allocated buffer size */
294
218
/* Strip final newline */
295
if(n > 0 and buffer[n-1] == '\n'){
219
if(n>0 and buffer[n-1] == '\n'){
296
220
buffer[n-1] = '\0'; /* not strictly necessary */