19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
21
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
22
* <https://www.fukt.bsnet.se/~teddy/>.
25
#define _GNU_SOURCE /* getline(), asprintf() */
25
#define _GNU_SOURCE /* getline() */
27
#include <termios.h> /* struct termios, tcsetattr(),
27
#include <termios.h> /* struct termios, tcsetattr(),
28
28
TCSAFLUSH, tcgetattr(), ECHO */
29
29
#include <unistd.h> /* struct termios, tcsetattr(),
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30
STDIN_FILENO, TCSAFLUSH,
31
tcgetattr(), ECHO, readlink() */
32
32
#include <signal.h> /* sig_atomic_t, raise(), struct
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33
sigaction, sigemptyset(),
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34
sigaction(), sigaddset(), SIGINT,
35
SIGQUIT, SIGHUP, SIGTERM,
35
SIGQUIT, SIGHUP, SIGTERM */
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36
#include <stddef.h> /* NULL, size_t, ssize_t */
38
#include <sys/types.h> /* ssize_t, struct dirent, pid_t,
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#include <sys/types.h> /* ssize_t */
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38
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
42
#include <dirent.h> /* scandir(), alphasort() */
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getopt_long, getenv() */
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40
#include <stdio.h> /* fprintf(), stderr, getline(),
44
stdin, feof(), fputc(), vfprintf(), vasprintf()
46
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
47
EFAULT, EFBIG, EIO, ENOSPC, EINTR
49
#include <error.h> /* error() */
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stdin, feof(), perror(), fputc(),
42
stdout, getopt_long */
43
#include <errno.h> /* errno, EINVAL */
50
44
#include <iso646.h> /* or, not */
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45
#include <stdbool.h> /* bool, false, true */
52
#include <inttypes.h> /* strtoumax() */
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#include <sys/stat.h> /* struct stat, lstat(), open() */
54
#include <string.h> /* strlen, rindex, memcmp, strerror() */
46
#include <string.h> /* strlen, rindex, strncmp, strcmp */
55
47
#include <argp.h> /* struct argp_option, struct
56
48
argp_state, struct argp,
57
49
argp_parse(), error_t,
58
50
ARGP_KEY_ARG, ARGP_KEY_END,
59
51
ARGP_ERR_UNKNOWN */
60
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
61
EX_UNAVAILABLE, EX_IOERR, EX_OK */
62
#include <fcntl.h> /* open() */
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#include <stdarg.h> /* va_list, va_start(), ... */
65
volatile sig_atomic_t quit_now = 0;
53
volatile bool quit_now = false;
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54
bool debug = false;
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const char *argp_program_version = "password-prompt " VERSION;
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const char *argp_program_version = "password-prompt 1.0";
69
56
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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/* Needed for conflict resolution */
72
const char plymouth_name[] = "plymouthd";
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/* Function to use when printing errors */
75
void error_plus(int status, int errnum, const char *formatstring, ...){
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va_start(ap, formatstring);
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ret = vasprintf(&text, formatstring, ap);
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fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);
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vfprintf(stderr, formatstring, ap);
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fprintf(stderr, ": ");
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fprintf(stderr, "%s\n", strerror(errnum));
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error(status, errno, "vasprintf while printing error");
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fprintf(stderr, "Mandos plugin ");
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error(status, errnum, "%s", text);
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static void termination_handler(int signum){
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signal_received = signum;
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bool conflict_detection(void){
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/* plymouth conflicts with password-prompt since both want to read
106
from the terminal. Password-prompt will exit if it detects
107
plymouth since plymouth performs the same functionality.
109
int is_plymouth(const struct dirent *proc_entry){
116
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
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if(errno != 0 or *tmp != '\0'
119
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
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char *cmdline_filename;
125
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
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error(0, errno, "asprintf");
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/* Open /proc/<pid>/cmdline */
133
cl_fd = open(cmdline_filename, O_RDONLY);
134
free(cmdline_filename);
137
error(0, errno, "open");
142
char *cmdline = NULL;
144
size_t cmdline_len = 0;
145
size_t cmdline_allocated = 0;
147
const size_t blocksize = 1024;
150
/* Allocate more space? */
151
if(cmdline_len + blocksize + 1 > cmdline_allocated){
152
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
154
error(0, errno, "realloc");
160
cmdline_allocated += blocksize;
164
sret = read(cl_fd, cmdline + cmdline_len,
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cmdline_allocated - cmdline_len);
167
error(0, errno, "read");
172
cmdline_len += (size_t)sret;
176
error(0, errno, "close");
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cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
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/* we now have cmdline */
185
char *cmdline_base = strrchr(cmdline, '/');
186
if(cmdline_base != NULL){
187
cmdline_base += 1; /* skip the slash */
189
cmdline_base = cmdline;
192
if(strcmp(cmdline_base, plymouth_name) != 0){
194
fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
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fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
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struct dirent **direntries;
210
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
212
error(1, errno, "scandir");
58
static void termination_handler(__attribute__((unused))int signum){
218
62
int main(int argc, char **argv){
222
65
struct termios t_new, t_old;
223
66
char *buffer = NULL;
233
76
.doc = "Prefix shown before the prompt", .group = 2 },
234
77
{ .name = "debug", .key = 128,
235
78
.doc = "Debug mode", .group = 3 },
237
* These reproduce what we would get without ARGP_NO_HELP
239
{ .name = "help", .key = '?',
240
.doc = "Give this help list", .group = -1 },
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{ .name = "usage", .key = -3,
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.doc = "Give a short usage message", .group = -1 },
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{ .name = "version", .key = 'V',
244
.doc = "Print program version", .group = -1 },
248
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. */
258
* These reproduce what we would get without ARGP_NO_HELP
260
case '?': /* --help */
261
argp_state_help(state, state->out_stream,
262
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
263
& ~(unsigned int)ARGP_HELP_EXIT_OK);
264
case -3: /* --usage */
265
argp_state_help(state, state->out_stream,
266
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
267
case 'V': /* --version */
268
fprintf(state->out_stream, "%s\n", argp_program_version);
269
exit(argp_err_exit_status);
272
98
return ARGP_ERR_UNKNOWN;
277
103
struct argp argp = { .options = options, .parser = parse_opt,
279
105
.doc = "Mandos password-prompt -- Read and"
280
106
" output a password" };
281
ret = argp_parse(&argp, argc, argv,
282
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
289
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");
297
115
fprintf(stderr, "Starting %s\n", argv[0]);
300
if (conflict_detection()){
302
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
308
118
fprintf(stderr, "Storing current terminal attributes\n");
311
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
313
error(0, errno, "tcgetattr");
317
return EX_UNAVAILABLE;
121
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
323
126
sigemptyset(&new_action.sa_mask);
324
ret = sigaddset(&new_action.sa_mask, SIGINT);
326
error(0, errno, "sigaddset");
329
ret = sigaddset(&new_action.sa_mask, SIGHUP);
331
error(0, errno, "sigaddset");
334
ret = sigaddset(&new_action.sa_mask, SIGTERM);
336
error(0, errno, "sigaddset");
339
/* Need to check if the handler is SIG_IGN before handling:
340
| [[info:libc:Initial Signal Actions]] |
341
| [[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);
343
130
ret = sigaction(SIGINT, NULL, &old_action);
345
error(0, errno, "sigaction");
348
if(old_action.sa_handler != SIG_IGN){
135
if (old_action.sa_handler != SIG_IGN){
349
136
ret = sigaction(SIGINT, &new_action, NULL);
351
error(0, errno, "sigaction");
355
142
ret = sigaction(SIGHUP, NULL, &old_action);
357
error(0, errno, "sigaction");
360
if(old_action.sa_handler != SIG_IGN){
147
if (old_action.sa_handler != SIG_IGN){
361
148
ret = sigaction(SIGHUP, &new_action, NULL);
363
error(0, errno, "sigaction");
367
154
ret = sigaction(SIGTERM, NULL, &old_action);
369
error(0, errno, "sigaction");
372
if(old_action.sa_handler != SIG_IGN){
159
if (old_action.sa_handler != SIG_IGN){
373
160
ret = sigaction(SIGTERM, &new_action, NULL);
375
error(0, errno, "sigaction");
382
169
fprintf(stderr, "Removing echo flag from terminal attributes\n");
386
t_new.c_lflag &= ~(tcflag_t)ECHO;
387
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
389
error(0, errno, "tcsetattr-echo");
393
return EX_UNAVAILABLE;
173
t_new.c_lflag &= ~ECHO;
174
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
175
perror("tcsetattr-echo");
401
180
fprintf(stderr, "Waiting for input from stdin \n");
406
185
fprintf(stderr, "Interrupted by signal, exiting.\n");
413
192
fprintf(stderr, "%s ", prefix);
416
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
417
const char *crypttarget = getenv("CRYPTTAB_NAME");
418
/* Before cryptsetup 1.1.0~rc2 */
419
if(cryptsource == NULL){
420
cryptsource = getenv("cryptsource");
422
if(crypttarget == NULL){
423
crypttarget = getenv("crypttarget");
425
const char *const prompt1 = "Unlocking the disk";
426
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";
427
199
if(cryptsource == NULL){
428
200
if(crypttarget == NULL){
429
fprintf(stderr, "%s to unlock the disk: ", prompt2);
201
fprintf(stderr, "%s: ", prompt);
431
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
203
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
435
206
if(crypttarget == NULL){
436
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
207
fprintf(stderr, "%s %s: ", prompt, cryptsource);
439
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
440
crypttarget, prompt2);
209
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
444
sret = getline(&buffer, &n, stdin);
214
ret = getline(&buffer, &n, stdin);
446
216
status = EXIT_SUCCESS;
447
217
/* Make n = data size instead of allocated buffer size */
449
219
/* Strip final newline */
450
if(n > 0 and buffer[n-1] == '\n'){
220
if(n>0 and buffer[n-1] == '\n'){
451
221
buffer[n-1] = '\0'; /* not strictly necessary */
454
224
size_t written = 0;
455
225
while(written < n){
456
sret = write(STDOUT_FILENO, buffer + written, n - written);
459
error(0, errno, "write");
471
status = EXIT_FAILURE;
476
written += (size_t)sret;
478
sret = close(STDOUT_FILENO);
481
error(0, errno, "close");
226
ret = write(STDOUT_FILENO, buffer + written, n - written);
229
status = EXIT_FAILURE;
232
written += (size_t)ret;
496
if(errno != EINTR and not feof(stdin)){
497
error(0, errno, "getline");
500
status = EX_UNAVAILABLE;
237
if (errno != EINTR and not feof(stdin)){
239
status = EXIT_FAILURE;
510
/* if(sret == 0), then the only sensible thing to do is to retry
511
to read from stdin */
243
/* if(ret == 0), then the only sensible thing to do is to retry to
512
245
fputc('\n', stderr);
513
246
if(debug and not quit_now){
514
/* If quit_now is nonzero, we were interrupted by a signal, and
247
/* If quit_now is true, we were interrupted by a signal, and
515
248
will print that later, so no need to show this too. */
516
249
fprintf(stderr, "getline() returned 0, retrying.\n");
523
256
fprintf(stderr, "Restoring terminal attributes\n");
525
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
526
error(0, errno, "tcsetattr+echo");
530
sigemptyset(&old_action.sa_mask);
531
old_action.sa_handler = SIG_DFL;
532
ret = sigaction(signal_received, &old_action, NULL);
534
error(0, errno, "sigaction");
536
raise(signal_received);
258
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
259
perror("tcsetattr+echo");
540
263
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
543
if(status == EXIT_SUCCESS or status == EX_OK){
266
if(status == EXIT_SUCCESS){
544
267
fputc('\n', stderr);