3
3
* Password-prompt - Read a password from the terminal and print it
5
* Copyright © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 Björn Påhlsson
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 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@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.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@recompile.se>";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.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)))
77
76
void error_plus(int status, int errnum, const char *formatstring,
83
82
va_start(ap, formatstring);
84
83
ret = vasprintf(&text, formatstring, ap);
86
85
fprintf(stderr, "Mandos plugin %s: ",
87
86
program_invocation_short_name);
88
87
vfprintf(stderr, formatstring, ap);
89
fprintf(stderr, ": %s\n", strerror(errnum));
88
fprintf(stderr, ": ");
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))
113
112
int is_plymouth(const struct dirent *proc_entry){
120
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
119
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
122
121
if(errno != 0 or *tmp != '\0'
123
or proc_id != (uintmax_t)((pid_t)proc_id)){
122
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
129
128
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
130
129
proc_entry->d_name);
132
error_plus(0, errno, "asprintf");
131
error(0, errno, "asprintf");
155
154
if(cmdline_len + blocksize + 1 > cmdline_allocated){
156
155
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
158
error_plus(0, errno, "realloc");
157
error(0, errno, "realloc");
168
167
sret = read(cl_fd, cmdline + cmdline_len,
169
168
cmdline_allocated - cmdline_len);
171
error_plus(0, errno, "read");
170
error(0, errno, "read");
212
211
struct dirent **direntries = NULL;
214
213
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
216
error_plus(1, errno, "scandir");
215
error(1, errno, "scandir");
218
217
free(direntries);
303
301
fprintf(stderr, "Starting %s\n", argv[0]);
306
if(conflict_detection()){
304
if (conflict_detection()){
308
306
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
317
315
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
319
error_plus(0, errno, "tcgetattr");
317
error(0, errno, "tcgetattr");
329
327
sigemptyset(&new_action.sa_mask);
330
328
ret = sigaddset(&new_action.sa_mask, SIGINT);
332
error_plus(0, errno, "sigaddset");
330
error(0, errno, "sigaddset");
335
333
ret = sigaddset(&new_action.sa_mask, SIGHUP);
337
error_plus(0, errno, "sigaddset");
335
error(0, errno, "sigaddset");
340
338
ret = sigaddset(&new_action.sa_mask, SIGTERM);
342
error_plus(0, errno, "sigaddset");
340
error(0, errno, "sigaddset");
345
343
/* Need to check if the handler is SIG_IGN before handling:
349
347
ret = sigaction(SIGINT, NULL, &old_action);
351
error_plus(0, errno, "sigaction");
349
error(0, errno, "sigaction");
354
352
if(old_action.sa_handler != SIG_IGN){
355
353
ret = sigaction(SIGINT, &new_action, NULL);
357
error_plus(0, errno, "sigaction");
355
error(0, errno, "sigaction");
361
359
ret = sigaction(SIGHUP, NULL, &old_action);
363
error_plus(0, errno, "sigaction");
361
error(0, errno, "sigaction");
366
364
if(old_action.sa_handler != SIG_IGN){
367
365
ret = sigaction(SIGHUP, &new_action, NULL);
369
error_plus(0, errno, "sigaction");
367
error(0, errno, "sigaction");
373
371
ret = sigaction(SIGTERM, NULL, &old_action);
375
error_plus(0, errno, "sigaction");
373
error(0, errno, "sigaction");
378
376
if(old_action.sa_handler != SIG_IGN){
379
377
ret = sigaction(SIGTERM, &new_action, NULL);
381
error_plus(0, errno, "sigaction");
379
error(0, errno, "sigaction");
392
390
t_new.c_lflag &= ~(tcflag_t)ECHO;
393
391
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
395
error_plus(0, errno, "tcsetattr-echo");
393
error(0, errno, "tcsetattr-echo");
462
460
sret = write(STDOUT_FILENO, buffer + written, n - written);
465
error_plus(0, errno, "write");
463
error(0, errno, "write");
484
482
sret = close(STDOUT_FILENO);
487
error_plus(0, errno, "close");
485
error(0, errno, "close");
490
488
status = EX_OSFILE;
502
500
if(errno != EINTR and not feof(stdin)){
503
error_plus(0, errno, "getline");
501
error(0, errno, "getline");
506
504
status = EX_UNAVAILABLE;
530
527
fprintf(stderr, "Restoring terminal attributes\n");
532
529
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
533
error_plus(0, errno, "tcsetattr+echo");
530
error(0, errno, "tcsetattr+echo");
538
535
old_action.sa_handler = SIG_DFL;
539
536
ret = sigaction(signal_received, &old_action, NULL);
541
error_plus(0, errno, "sigaction");
538
error(0, errno, "sigaction");
543
540
raise(signal_received);