3
3
* Password-prompt - Read a password from the terminal and print it
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 Björn Påhlsson
5
* Copyright © 2008-2017 Teddy Hogeborn
6
* Copyright © 2008-2017 Björn Påhlsson
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
25
25
#define _GNU_SOURCE /* getline(), asprintf() */
67
67
int signal_received;
68
68
bool debug = false;
69
69
const char *argp_program_version = "password-prompt " VERSION;
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
70
const char *argp_program_bug_address = "<mandos@recompile.se>";
72
72
/* Needed for conflict resolution */
73
73
const char plymouth_name[] = "plymouthd";
75
75
/* Function to use when printing errors */
76
__attribute__((format (gnu_printf, 3, 4)))
76
77
void error_plus(int status, int errnum, const char *formatstring,
82
83
va_start(ap, formatstring);
83
84
ret = vasprintf(&text, formatstring, ap);
85
86
fprintf(stderr, "Mandos plugin %s: ",
86
87
program_invocation_short_name);
87
88
vfprintf(stderr, formatstring, ap);
88
fprintf(stderr, ": ");
89
fprintf(stderr, "%s\n", strerror(errnum));
89
fprintf(stderr, ": %s\n", strerror(errnum));
90
90
error(status, errno, "vasprintf while printing error");
109
109
from the terminal. Password-prompt will exit if it detects
110
110
plymouth since plymouth performs the same functionality.
112
__attribute__((nonnull))
112
113
int is_plymouth(const struct dirent *proc_entry){
119
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
120
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
121
122
if(errno != 0 or *tmp != '\0'
122
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
123
or proc_id != (uintmax_t)((pid_t)proc_id)){
128
129
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
129
130
proc_entry->d_name);
131
error(0, errno, "asprintf");
132
error_plus(0, errno, "asprintf");
154
155
if(cmdline_len + blocksize + 1 > cmdline_allocated){
155
156
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
157
error(0, errno, "realloc");
158
error_plus(0, errno, "realloc");
167
168
sret = read(cl_fd, cmdline + cmdline_len,
168
169
cmdline_allocated - cmdline_len);
170
error(0, errno, "read");
171
error_plus(0, errno, "read");
211
212
struct dirent **direntries = NULL;
213
214
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
215
error(1, errno, "scandir");
216
error_plus(1, errno, "scandir");
217
218
free(direntries);
301
303
fprintf(stderr, "Starting %s\n", argv[0]);
304
if (conflict_detection()){
306
if(conflict_detection()){
306
308
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
315
317
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
317
error(0, errno, "tcgetattr");
319
error_plus(0, errno, "tcgetattr");
327
329
sigemptyset(&new_action.sa_mask);
328
330
ret = sigaddset(&new_action.sa_mask, SIGINT);
330
error(0, errno, "sigaddset");
332
error_plus(0, errno, "sigaddset");
333
335
ret = sigaddset(&new_action.sa_mask, SIGHUP);
335
error(0, errno, "sigaddset");
337
error_plus(0, errno, "sigaddset");
338
340
ret = sigaddset(&new_action.sa_mask, SIGTERM);
340
error(0, errno, "sigaddset");
342
error_plus(0, errno, "sigaddset");
343
345
/* Need to check if the handler is SIG_IGN before handling:
347
349
ret = sigaction(SIGINT, NULL, &old_action);
349
error(0, errno, "sigaction");
351
error_plus(0, errno, "sigaction");
352
354
if(old_action.sa_handler != SIG_IGN){
353
355
ret = sigaction(SIGINT, &new_action, NULL);
355
error(0, errno, "sigaction");
357
error_plus(0, errno, "sigaction");
359
361
ret = sigaction(SIGHUP, NULL, &old_action);
361
error(0, errno, "sigaction");
363
error_plus(0, errno, "sigaction");
364
366
if(old_action.sa_handler != SIG_IGN){
365
367
ret = sigaction(SIGHUP, &new_action, NULL);
367
error(0, errno, "sigaction");
369
error_plus(0, errno, "sigaction");
371
373
ret = sigaction(SIGTERM, NULL, &old_action);
373
error(0, errno, "sigaction");
375
error_plus(0, errno, "sigaction");
376
378
if(old_action.sa_handler != SIG_IGN){
377
379
ret = sigaction(SIGTERM, &new_action, NULL);
379
error(0, errno, "sigaction");
381
error_plus(0, errno, "sigaction");
390
392
t_new.c_lflag &= ~(tcflag_t)ECHO;
391
393
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
393
error(0, errno, "tcsetattr-echo");
395
error_plus(0, errno, "tcsetattr-echo");
460
462
sret = write(STDOUT_FILENO, buffer + written, n - written);
463
error(0, errno, "write");
465
error_plus(0, errno, "write");
482
484
sret = close(STDOUT_FILENO);
485
error(0, errno, "close");
487
error_plus(0, errno, "close");
488
490
status = EX_OSFILE;
500
502
if(errno != EINTR and not feof(stdin)){
501
error(0, errno, "getline");
503
error_plus(0, errno, "getline");
504
506
status = EX_UNAVAILABLE;
527
530
fprintf(stderr, "Restoring terminal attributes\n");
529
532
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
530
error(0, errno, "tcsetattr+echo");
533
error_plus(0, errno, "tcsetattr+echo");
535
538
old_action.sa_handler = SIG_DFL;
536
539
ret = sigaction(signal_received, &old_action, NULL);
538
error(0, errno, "sigaction");
541
error_plus(0, errno, "sigaction");
540
543
raise(signal_received);