3
3
* Password-prompt - Read a password from the terminal and print it
5
* Copyright © 2008-2019 Teddy Hogeborn
6
* Copyright © 2008-2019 Björn Påhlsson
8
* This file is part of Mandos.
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
15
* Mandos is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 Björn Påhlsson
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
13
* This program is distributed in the hope that it will be useful, but
16
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
16
* General Public License for more details.
20
18
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
23
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
26
25
#define _GNU_SOURCE /* getline(), asprintf() */
42
41
getenv(), free() */
43
42
#include <dirent.h> /* scandir(), alphasort() */
44
43
#include <stdio.h> /* fprintf(), stderr, getline(),
45
stdin, feof(), fputc(), vfprintf(),
44
stdin, feof(), fputc()
47
46
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
48
47
EFAULT, EFBIG, EIO, ENOSPC, EINTR
52
51
#include <stdbool.h> /* bool, false, true */
53
52
#include <inttypes.h> /* strtoumax() */
54
53
#include <sys/stat.h> /* struct stat, lstat(), open() */
55
#include <string.h> /* strlen, rindex, memcmp, strerror()
54
#include <string.h> /* strlen, rindex, memcmp */
57
55
#include <argp.h> /* struct argp_option, struct
58
56
argp_state, struct argp,
59
57
argp_parse(), error_t,
62
60
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
63
61
EX_UNAVAILABLE, EX_IOERR, EX_OK */
64
62
#include <fcntl.h> /* open() */
65
#include <stdarg.h> /* va_list, va_start(), ... */
67
64
volatile sig_atomic_t quit_now = 0;
68
65
int signal_received;
69
66
bool debug = false;
70
67
const char *argp_program_version = "password-prompt " VERSION;
71
const char *argp_program_bug_address = "<mandos@recompile.se>";
68
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
73
70
/* Needed for conflict resolution */
74
71
const char plymouth_name[] = "plymouthd";
76
/* Function to use when printing errors */
77
__attribute__((format (gnu_printf, 3, 4)))
78
void error_plus(int status, int errnum, const char *formatstring,
84
va_start(ap, formatstring);
85
ret = vasprintf(&text, formatstring, ap);
87
fprintf(stderr, "Mandos plugin %s: ",
88
program_invocation_short_name);
89
vfprintf(stderr, formatstring, ap);
90
fprintf(stderr, ": %s\n", strerror(errnum));
91
error(status, errno, "vasprintf while printing error");
94
fprintf(stderr, "Mandos plugin ");
95
error(status, errnum, "%s", text);
99
73
static void termination_handler(int signum){
110
84
from the terminal. Password-prompt will exit if it detects
111
85
plymouth since plymouth performs the same functionality.
113
__attribute__((nonnull))
114
87
int is_plymouth(const struct dirent *proc_entry){
121
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
94
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
123
96
if(errno != 0 or *tmp != '\0'
124
or proc_id != (uintmax_t)((pid_t)proc_id)){
97
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
130
103
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
131
104
proc_entry->d_name);
133
error_plus(0, errno, "asprintf");
106
error(0, errno, "asprintf");
156
129
if(cmdline_len + blocksize + 1 > cmdline_allocated){
157
130
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
159
error_plus(0, errno, "realloc");
132
error(0, errno, "realloc");
169
142
sret = read(cl_fd, cmdline + cmdline_len,
170
143
cmdline_allocated - cmdline_len);
172
error_plus(0, errno, "read");
145
error(0, errno, "read");
213
struct dirent **direntries = NULL;
186
struct dirent **direntries;
215
188
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
217
error_plus(1, errno, "scandir");
190
error(1, errno, "scandir");
274
239
argp_state_help(state, state->out_stream,
275
240
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
276
241
& ~(unsigned int)ARGP_HELP_EXIT_OK);
277
__builtin_unreachable();
278
242
case -3: /* --usage */
279
243
argp_state_help(state, state->out_stream,
280
244
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
281
__builtin_unreachable();
282
245
case 'V': /* --version */
283
246
fprintf(state->out_stream, "%s\n", argp_program_version);
284
247
exit(argp_err_exit_status);
312
275
fprintf(stderr, "Starting %s\n", argv[0]);
315
if(conflict_detection()){
278
if (conflict_detection()){
317
280
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
326
289
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
328
error_plus(0, errno, "tcgetattr");
291
error(0, errno, "tcgetattr");
338
301
sigemptyset(&new_action.sa_mask);
339
302
ret = sigaddset(&new_action.sa_mask, SIGINT);
341
error_plus(0, errno, "sigaddset");
304
error(0, errno, "sigaddset");
344
307
ret = sigaddset(&new_action.sa_mask, SIGHUP);
346
error_plus(0, errno, "sigaddset");
309
error(0, errno, "sigaddset");
349
312
ret = sigaddset(&new_action.sa_mask, SIGTERM);
351
error_plus(0, errno, "sigaddset");
314
error(0, errno, "sigaddset");
354
317
/* Need to check if the handler is SIG_IGN before handling:
358
321
ret = sigaction(SIGINT, NULL, &old_action);
360
error_plus(0, errno, "sigaction");
323
error(0, errno, "sigaction");
363
326
if(old_action.sa_handler != SIG_IGN){
364
327
ret = sigaction(SIGINT, &new_action, NULL);
366
error_plus(0, errno, "sigaction");
329
error(0, errno, "sigaction");
370
333
ret = sigaction(SIGHUP, NULL, &old_action);
372
error_plus(0, errno, "sigaction");
335
error(0, errno, "sigaction");
375
338
if(old_action.sa_handler != SIG_IGN){
376
339
ret = sigaction(SIGHUP, &new_action, NULL);
378
error_plus(0, errno, "sigaction");
341
error(0, errno, "sigaction");
382
345
ret = sigaction(SIGTERM, NULL, &old_action);
384
error_plus(0, errno, "sigaction");
347
error(0, errno, "sigaction");
387
350
if(old_action.sa_handler != SIG_IGN){
388
351
ret = sigaction(SIGTERM, &new_action, NULL);
390
error_plus(0, errno, "sigaction");
353
error(0, errno, "sigaction");
401
364
t_new.c_lflag &= ~(tcflag_t)ECHO;
402
365
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
404
error_plus(0, errno, "tcsetattr-echo");
367
error(0, errno, "tcsetattr-echo");
471
434
sret = write(STDOUT_FILENO, buffer + written, n - written);
474
error_plus(0, errno, "write");
437
error(0, errno, "write");
493
456
sret = close(STDOUT_FILENO);
496
error_plus(0, errno, "close");
459
error(0, errno, "close");
499
462
status = EX_OSFILE;
513
error_plus(0, errno, "getline");
516
status = EX_UNAVAILABLE;
474
if(errno != EINTR and not feof(stdin)){
475
error(0, errno, "getline");
478
status = EX_UNAVAILABLE;
530
488
/* if(sret == 0), then the only sensible thing to do is to retry
543
501
fprintf(stderr, "Restoring terminal attributes\n");
545
503
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
546
error_plus(0, errno, "tcsetattr+echo");
504
error(0, errno, "tcsetattr+echo");
551
509
old_action.sa_handler = SIG_DFL;
552
510
ret = sigaction(signal_received, &old_action, NULL);
554
error_plus(0, errno, "sigaction");
512
error(0, errno, "sigaction");
556
514
raise(signal_received);