3
3
* Password-prompt - Read a password from the terminal and print it
5
* Copyright © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 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
__attribute__((format (gnu_printf, 2, 3), nonnull(1)))
76
int fprintf_plus(FILE *stream, const char *format, ...){
78
va_start (ap, format);
80
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
81
program_invocation_short_name));
82
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
85
75
/* Function to use when printing errors */
86
__attribute__((format (gnu_printf, 3, 4)))
87
76
void error_plus(int status, int errnum, const char *formatstring,
96
85
fprintf(stderr, "Mandos plugin %s: ",
97
86
program_invocation_short_name);
98
87
vfprintf(stderr, formatstring, ap);
99
fprintf(stderr, ": %s\n", strerror(errnum));
88
fprintf(stderr, ": ");
89
fprintf(stderr, "%s\n", strerror(errnum));
100
90
error(status, errno, "vasprintf while printing error");
119
109
from the terminal. Password-prompt will exit if it detects
120
110
plymouth since plymouth performs the same functionality.
122
__attribute__((nonnull))
123
112
int is_plymouth(const struct dirent *proc_entry){
130
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
119
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
132
121
if(errno != 0 or *tmp != '\0'
133
or proc_id != (uintmax_t)((pid_t)proc_id)){
122
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
139
128
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
140
129
proc_entry->d_name);
142
error_plus(0, errno, "asprintf");
131
error(0, errno, "asprintf");
165
154
if(cmdline_len + blocksize + 1 > cmdline_allocated){
166
155
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
168
error_plus(0, errno, "realloc");
157
error(0, errno, "realloc");
178
167
sret = read(cl_fd, cmdline + cmdline_len,
179
168
cmdline_allocated - cmdline_len);
181
error_plus(0, errno, "read");
170
error(0, errno, "read");
224
213
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
226
error_plus(1, errno, "scandir");
215
error(1, errno, "scandir");
228
217
free(direntries);
327
315
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
329
error_plus(0, errno, "tcgetattr");
317
error(0, errno, "tcgetattr");
339
327
sigemptyset(&new_action.sa_mask);
340
328
ret = sigaddset(&new_action.sa_mask, SIGINT);
342
error_plus(0, errno, "sigaddset");
330
error(0, errno, "sigaddset");
345
333
ret = sigaddset(&new_action.sa_mask, SIGHUP);
347
error_plus(0, errno, "sigaddset");
335
error(0, errno, "sigaddset");
350
338
ret = sigaddset(&new_action.sa_mask, SIGTERM);
352
error_plus(0, errno, "sigaddset");
340
error(0, errno, "sigaddset");
355
343
/* Need to check if the handler is SIG_IGN before handling:
359
347
ret = sigaction(SIGINT, NULL, &old_action);
361
error_plus(0, errno, "sigaction");
349
error(0, errno, "sigaction");
364
352
if(old_action.sa_handler != SIG_IGN){
365
353
ret = sigaction(SIGINT, &new_action, NULL);
367
error_plus(0, errno, "sigaction");
355
error(0, errno, "sigaction");
371
359
ret = sigaction(SIGHUP, NULL, &old_action);
373
error_plus(0, errno, "sigaction");
361
error(0, errno, "sigaction");
376
364
if(old_action.sa_handler != SIG_IGN){
377
365
ret = sigaction(SIGHUP, &new_action, NULL);
379
error_plus(0, errno, "sigaction");
367
error(0, errno, "sigaction");
383
371
ret = sigaction(SIGTERM, NULL, &old_action);
385
error_plus(0, errno, "sigaction");
373
error(0, errno, "sigaction");
388
376
if(old_action.sa_handler != SIG_IGN){
389
377
ret = sigaction(SIGTERM, &new_action, NULL);
391
error_plus(0, errno, "sigaction");
379
error(0, errno, "sigaction");
402
390
t_new.c_lflag &= ~(tcflag_t)ECHO;
403
391
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
405
error_plus(0, errno, "tcsetattr-echo");
393
error(0, errno, "tcsetattr-echo");
472
460
sret = write(STDOUT_FILENO, buffer + written, n - written);
475
error_plus(0, errno, "write");
463
error(0, errno, "write");
494
482
sret = close(STDOUT_FILENO);
497
error_plus(0, errno, "close");
485
error(0, errno, "close");
500
488
status = EX_OSFILE;
512
500
if(errno != EINTR and not feof(stdin)){
513
error_plus(0, errno, "getline");
501
error(0, errno, "getline");
516
504
status = EX_UNAVAILABLE;
540
527
fprintf(stderr, "Restoring terminal attributes\n");
542
529
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
543
error_plus(0, errno, "tcsetattr+echo");
530
error(0, errno, "tcsetattr+echo");
548
535
old_action.sa_handler = SIG_DFL;
549
536
ret = sigaction(signal_received, &old_action, NULL);
551
error_plus(0, errno, "sigaction");
538
error(0, errno, "sigaction");
553
540
raise(signal_received);