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,
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(),
43
stdout, getopt_long */
44
#include <errno.h> /* errno, EINVAL */
42
stdin, feof(), fputc()
44
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
45
EFAULT, EFBIG, EIO, ENOSPC, EINTR
47
#include <error.h> /* error() */
45
48
#include <iso646.h> /* or, not */
46
49
#include <stdbool.h> /* bool, false, true */
47
#include <string.h> /* strlen, rindex, strncmp, strcmp */
50
#include <string.h> /* strlen, rindex */
48
51
#include <argp.h> /* struct argp_option, struct
49
52
argp_state, struct argp,
50
53
argp_parse(), error_t,
51
54
ARGP_KEY_ARG, ARGP_KEY_END,
52
55
ARGP_ERR_UNKNOWN */
56
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
57
EX_UNAVAILABLE, EX_IOERR, EX_OK */
54
volatile bool quit_now = false;
59
volatile sig_atomic_t quit_now = 0;
55
61
bool debug = false;
56
62
const char *argp_program_version = "password-prompt " VERSION;
57
63
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
59
static void termination_handler(__attribute__((unused))int signum){
65
static void termination_handler(int signum){
70
signal_received = signum;
63
73
int main(int argc, char **argv){
66
77
struct termios t_new, t_old;
67
78
char *buffer = NULL;
77
88
.doc = "Prefix shown before the prompt", .group = 2 },
78
89
{ .name = "debug", .key = 128,
79
90
.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 },
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. */
103
error_t parse_opt (int key, char *arg, struct argp_state *state){
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);
99
127
return ARGP_ERR_UNKNOWN;
104
132
struct argp argp = { .options = options, .parser = parse_opt,
106
134
.doc = "Mandos password-prompt -- Read and"
107
135
" 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");
136
ret = argp_parse(&argp, argc, argv,
137
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
144
error(0, errno, "argp_parse");
116
152
fprintf(stderr, "Starting %s\n", argv[0]);
119
155
fprintf(stderr, "Storing current terminal attributes\n");
122
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
158
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
160
error(0, errno, "tcgetattr");
164
return EX_UNAVAILABLE;
127
170
sigemptyset(&new_action.sa_mask);
128
sigaddset(&new_action.sa_mask, SIGINT);
129
sigaddset(&new_action.sa_mask, SIGHUP);
130
sigaddset(&new_action.sa_mask, SIGTERM);
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]] |
131
190
ret = sigaction(SIGINT, NULL, &old_action);
192
error(0, errno, "sigaction");
136
if (old_action.sa_handler != SIG_IGN){
195
if(old_action.sa_handler != SIG_IGN){
137
196
ret = sigaction(SIGINT, &new_action, NULL);
198
error(0, errno, "sigaction");
143
202
ret = sigaction(SIGHUP, NULL, &old_action);
204
error(0, errno, "sigaction");
148
if (old_action.sa_handler != SIG_IGN){
207
if(old_action.sa_handler != SIG_IGN){
149
208
ret = sigaction(SIGHUP, &new_action, NULL);
210
error(0, errno, "sigaction");
155
214
ret = sigaction(SIGTERM, NULL, &old_action);
216
error(0, errno, "sigaction");
160
if (old_action.sa_handler != SIG_IGN){
219
if(old_action.sa_handler != SIG_IGN){
161
220
ret = sigaction(SIGTERM, &new_action, NULL);
222
error(0, errno, "sigaction");
170
229
fprintf(stderr, "Removing echo flag from terminal attributes\n");
174
t_new.c_lflag &= ~ECHO;
175
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
176
perror("tcsetattr-echo");
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;
181
248
fprintf(stderr, "Waiting for input from stdin \n");
186
253
fprintf(stderr, "Interrupted by signal, exiting.\n");
193
260
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";
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";
200
274
if(cryptsource == NULL){
201
275
if(crypttarget == NULL){
202
fprintf(stderr, "%s: ", prompt);
276
fprintf(stderr, "%s to unlock the disk: ", prompt2);
204
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
278
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
207
282
if(crypttarget == NULL){
208
fprintf(stderr, "%s %s: ", prompt, cryptsource);
283
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
210
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
286
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
287
crypttarget, prompt2);
215
ret = getline(&buffer, &n, stdin);
291
sret = getline(&buffer, &n, stdin);
217
293
status = EXIT_SUCCESS;
218
294
/* Make n = data size instead of allocated buffer size */
220
296
/* Strip final newline */
221
if(n>0 and buffer[n-1] == '\n'){
297
if(n > 0 and buffer[n-1] == '\n'){
222
298
buffer[n-1] = '\0'; /* not strictly necessary */
225
301
size_t written = 0;
226
302
while(written < n){
227
ret = write(STDOUT_FILENO, buffer + written, n - written);
230
status = EXIT_FAILURE;
233
written += (size_t)ret;
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");
238
if (errno != EINTR and not feof(stdin)){
240
status = EXIT_FAILURE;
343
if(errno != EINTR and not feof(stdin)){
344
error(0, errno, "getline");
347
status = EX_UNAVAILABLE;
244
/* if(ret == 0), then the only sensible thing to do is to retry to
357
/* if(sret == 0), then the only sensible thing to do is to retry to
245
358
read from stdin */
246
359
fputc('\n', stderr);
247
360
if(debug and not quit_now){
248
/* If quit_now is true, we were interrupted by a signal, and
361
/* If quit_now is nonzero, we were interrupted by a signal, and
249
362
will print that later, so no need to show this too. */
250
363
fprintf(stderr, "getline() returned 0, retrying.\n");