32
32
#include <signal.h> /* sig_atomic_t, raise(), struct
33
33
sigaction, sigemptyset(),
34
34
sigaction(), sigaddset(), SIGINT,
35
SIGQUIT, SIGHUP, SIGTERM,
35
SIGQUIT, SIGHUP, SIGTERM */
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,
39
getopt_long, getenv() */
41
40
#include <stdio.h> /* fprintf(), stderr, getline(),
42
stdin, feof(), fputc()
44
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
45
EFAULT, EFBIG, EIO, ENOSPC, EINTR
47
#include <error.h> /* error() */
41
stdin, feof(), perror(), fputc(),
42
stdout, getopt_long */
43
#include <errno.h> /* errno, EINVAL */
48
44
#include <iso646.h> /* or, not */
49
45
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strlen, rindex */
46
#include <string.h> /* strlen, rindex, strncmp, strcmp */
51
47
#include <argp.h> /* struct argp_option, struct
52
48
argp_state, struct argp,
53
49
argp_parse(), error_t,
54
50
ARGP_KEY_ARG, ARGP_KEY_END,
55
51
ARGP_ERR_UNKNOWN */
56
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
57
EX_UNAVAILABLE, EX_IOERR, EX_OK */
59
volatile sig_atomic_t quit_now = 0;
53
volatile bool quit_now = false;
61
54
bool debug = false;
62
const char *argp_program_version = "password-prompt " VERSION;
55
const char *argp_program_version = "password-prompt 1.0";
63
56
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
65
static void termination_handler(int signum){
70
signal_received = signum;
58
static void termination_handler(__attribute__((unused))int signum){
73
62
int main(int argc, char **argv){
77
65
struct termios t_new, t_old;
78
66
char *buffer = NULL;
88
76
.doc = "Prefix shown before the prompt", .group = 2 },
89
77
{ .name = "debug", .key = 128,
90
78
.doc = "Debug mode", .group = 3 },
92
* These reproduce what we would get without ARGP_NO_HELP
94
{ .name = "help", .key = '?',
95
.doc = "Give this help list", .group = -1 },
96
{ .name = "usage", .key = -3,
97
.doc = "Give a short usage message", .group = -1 },
98
{ .name = "version", .key = 'V',
99
.doc = "Print program version", .group = -1 },
103
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. */
113
* These reproduce what we would get without ARGP_NO_HELP
115
case '?': /* --help */
116
argp_state_help(state, state->out_stream,
117
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
118
& ~(unsigned int)ARGP_HELP_EXIT_OK);
119
case -3: /* --usage */
120
argp_state_help(state, state->out_stream,
121
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
122
case 'V': /* --version */
123
fprintf(state->out_stream, "%s\n", argp_program_version);
124
exit(argp_err_exit_status);
127
98
return ARGP_ERR_UNKNOWN;
132
103
struct argp argp = { .options = options, .parser = parse_opt,
134
105
.doc = "Mandos password-prompt -- Read and"
135
106
" output a password" };
136
ret = argp_parse(&argp, argc, argv,
137
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
144
error(0, errno, "argp_parse");
107
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
108
if (ret == ARGP_ERR_UNKNOWN){
109
fprintf(stderr, "Unknown error while parsing arguments\n");
152
115
fprintf(stderr, "Starting %s\n", argv[0]);
155
118
fprintf(stderr, "Storing current terminal attributes\n");
158
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
160
error(0, errno, "tcgetattr");
164
return EX_UNAVAILABLE;
121
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
170
126
sigemptyset(&new_action.sa_mask);
171
ret = sigaddset(&new_action.sa_mask, SIGINT);
173
error(0, errno, "sigaddset");
176
ret = sigaddset(&new_action.sa_mask, SIGHUP);
178
error(0, errno, "sigaddset");
181
ret = sigaddset(&new_action.sa_mask, SIGTERM);
183
error(0, errno, "sigaddset");
186
/* Need to check if the handler is SIG_IGN before handling:
187
| [[info:libc:Initial Signal Actions]] |
188
| [[info:libc:Basic Signal Handling]] |
127
sigaddset(&new_action.sa_mask, SIGINT);
128
sigaddset(&new_action.sa_mask, SIGHUP);
129
sigaddset(&new_action.sa_mask, SIGTERM);
190
130
ret = sigaction(SIGINT, NULL, &old_action);
192
error(0, errno, "sigaction");
195
if(old_action.sa_handler != SIG_IGN){
135
if (old_action.sa_handler != SIG_IGN){
196
136
ret = sigaction(SIGINT, &new_action, NULL);
198
error(0, errno, "sigaction");
202
142
ret = sigaction(SIGHUP, NULL, &old_action);
204
error(0, errno, "sigaction");
207
if(old_action.sa_handler != SIG_IGN){
147
if (old_action.sa_handler != SIG_IGN){
208
148
ret = sigaction(SIGHUP, &new_action, NULL);
210
error(0, errno, "sigaction");
214
154
ret = sigaction(SIGTERM, NULL, &old_action);
216
error(0, errno, "sigaction");
219
if(old_action.sa_handler != SIG_IGN){
159
if (old_action.sa_handler != SIG_IGN){
220
160
ret = sigaction(SIGTERM, &new_action, NULL);
222
error(0, errno, "sigaction");
229
169
fprintf(stderr, "Removing echo flag from terminal attributes\n");
233
t_new.c_lflag &= ~(tcflag_t)ECHO;
234
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
236
error(0, errno, "tcsetattr-echo");
240
return EX_UNAVAILABLE;
173
t_new.c_lflag &= ~ECHO;
174
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
175
perror("tcsetattr-echo");
248
180
fprintf(stderr, "Waiting for input from stdin \n");
253
185
fprintf(stderr, "Interrupted by signal, exiting.\n");
260
192
fprintf(stderr, "%s ", prefix);
263
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
264
const char *crypttarget = getenv("CRYPTTAB_NAME");
265
/* Before cryptsetup 1.1.0~rc2 */
266
if(cryptsource == NULL){
267
cryptsource = getenv("cryptsource");
269
if(crypttarget == NULL){
270
crypttarget = getenv("crypttarget");
272
const char *const prompt1 = "Unlocking the disk";
273
const char *const prompt2 = "Enter passphrase";
195
const char *cryptsource = getenv("cryptsource");
196
const char *crypttarget = getenv("crypttarget");
197
const char *const prompt
198
= "Enter passphrase to unlock the disk";
274
199
if(cryptsource == NULL){
275
200
if(crypttarget == NULL){
276
fprintf(stderr, "%s to unlock the disk: ", prompt2);
201
fprintf(stderr, "%s: ", prompt);
278
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
203
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
282
206
if(crypttarget == NULL){
283
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
207
fprintf(stderr, "%s %s: ", prompt, cryptsource);
286
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
287
crypttarget, prompt2);
209
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
291
sret = getline(&buffer, &n, stdin);
214
ret = getline(&buffer, &n, stdin);
293
216
status = EXIT_SUCCESS;
294
217
/* Make n = data size instead of allocated buffer size */
296
/* Strip final newline */
297
if(n > 0 and buffer[n-1] == '\n'){
298
buffer[n-1] = '\0'; /* not strictly necessary */
301
219
size_t written = 0;
302
220
while(written < n){
303
sret = write(STDOUT_FILENO, buffer + written, n - written);
306
error(0, errno, "write");
318
status = EXIT_FAILURE;
323
written += (size_t)sret;
325
sret = close(STDOUT_FILENO);
328
error(0, errno, "close");
221
ret = write(STDOUT_FILENO, buffer + written, n - written);
224
status = EXIT_FAILURE;
227
written += (size_t)ret;
343
if(errno != EINTR and not feof(stdin)){
344
error(0, errno, "getline");
347
status = EX_UNAVAILABLE;
232
if (errno != EINTR and not feof(stdin)){
234
status = EXIT_FAILURE;
357
/* if(sret == 0), then the only sensible thing to do is to retry to
238
/* if(ret == 0), then the only sensible thing to do is to retry to
358
239
read from stdin */
359
240
fputc('\n', stderr);
360
241
if(debug and not quit_now){
361
/* If quit_now is nonzero, we were interrupted by a signal, and
242
/* If quit_now is true, we were interrupted by a signal, and
362
243
will print that later, so no need to show this too. */
363
244
fprintf(stderr, "getline() returned 0, retrying.\n");
370
249
fprintf(stderr, "Restoring terminal attributes\n");
372
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
373
error(0, errno, "tcsetattr+echo");
377
sigemptyset(&old_action.sa_mask);
378
old_action.sa_handler = SIG_DFL;
379
ret = sigaction(signal_received, &old_action, NULL);
381
error(0, errno, "sigaction");
383
raise(signal_received);
251
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
252
perror("tcsetattr+echo");
387
256
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
390
if(status == EXIT_SUCCESS or status == EX_OK){
259
if(status == EXIT_SUCCESS){
391
260
fputc('\n', stderr);