3
3
* Password-prompt - Read a password from the terminal and print it
5
* Copyright © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 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() */
41
41
getenv(), free() */
42
42
#include <dirent.h> /* scandir(), alphasort() */
43
43
#include <stdio.h> /* fprintf(), stderr, getline(),
44
stdin, feof(), fputc(), vfprintf(),
44
stdin, feof(), fputc(), vfprintf(), vasprintf()
46
46
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
47
47
EFAULT, EFBIG, EIO, ENOSPC, EINTR
51
51
#include <stdbool.h> /* bool, false, true */
52
52
#include <inttypes.h> /* strtoumax() */
53
53
#include <sys/stat.h> /* struct stat, lstat(), open() */
54
#include <string.h> /* strlen, rindex, memcmp, strerror()
54
#include <string.h> /* strlen, rindex, memcmp, strerror() */
56
55
#include <argp.h> /* struct argp_option, struct
57
56
argp_state, struct argp,
58
57
argp_parse(), error_t,
67
66
int signal_received;
68
67
bool debug = false;
69
68
const char *argp_program_version = "password-prompt " VERSION;
70
const char *argp_program_bug_address = "<mandos@recompile.se>";
69
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
71
/* Needed for conflict resolution */
73
72
const char plymouth_name[] = "plymouthd";
75
74
/* Function to use when printing errors */
76
__attribute__((format (gnu_printf, 3, 4)))
77
void error_plus(int status, int errnum, const char *formatstring,
75
void error_plus(int status, int errnum, const char *formatstring, ...){
83
80
va_start(ap, formatstring);
84
81
ret = vasprintf(&text, formatstring, ap);
86
fprintf(stderr, "Mandos plugin %s: ",
87
program_invocation_short_name);
83
fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);
88
84
vfprintf(stderr, formatstring, ap);
89
fprintf(stderr, ": %s\n", strerror(errnum));
85
fprintf(stderr, ": ");
86
fprintf(stderr, "%s\n", strerror(errnum));
90
87
error(status, errno, "vasprintf while printing error");
109
106
from the terminal. Password-prompt will exit if it detects
110
107
plymouth since plymouth performs the same functionality.
112
__attribute__((nonnull))
113
109
int is_plymouth(const struct dirent *proc_entry){
120
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
116
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
122
118
if(errno != 0 or *tmp != '\0'
123
or proc_id != (uintmax_t)((pid_t)proc_id)){
119
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
129
125
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
130
126
proc_entry->d_name);
132
error_plus(0, errno, "asprintf");
128
error(0, errno, "asprintf");
155
151
if(cmdline_len + blocksize + 1 > cmdline_allocated){
156
152
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
158
error_plus(0, errno, "realloc");
154
error(0, errno, "realloc");
168
164
sret = read(cl_fd, cmdline + cmdline_len,
169
165
cmdline_allocated - cmdline_len);
171
error_plus(0, errno, "read");
167
error(0, errno, "read");
212
struct dirent **direntries = NULL;
208
struct dirent **direntries;
214
210
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
216
error_plus(1, errno, "scandir");
212
error(1, errno, "scandir");
317
311
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
319
error_plus(0, errno, "tcgetattr");
313
error(0, errno, "tcgetattr");
329
323
sigemptyset(&new_action.sa_mask);
330
324
ret = sigaddset(&new_action.sa_mask, SIGINT);
332
error_plus(0, errno, "sigaddset");
326
error(0, errno, "sigaddset");
335
329
ret = sigaddset(&new_action.sa_mask, SIGHUP);
337
error_plus(0, errno, "sigaddset");
331
error(0, errno, "sigaddset");
340
334
ret = sigaddset(&new_action.sa_mask, SIGTERM);
342
error_plus(0, errno, "sigaddset");
336
error(0, errno, "sigaddset");
345
339
/* Need to check if the handler is SIG_IGN before handling:
349
343
ret = sigaction(SIGINT, NULL, &old_action);
351
error_plus(0, errno, "sigaction");
345
error(0, errno, "sigaction");
354
348
if(old_action.sa_handler != SIG_IGN){
355
349
ret = sigaction(SIGINT, &new_action, NULL);
357
error_plus(0, errno, "sigaction");
351
error(0, errno, "sigaction");
361
355
ret = sigaction(SIGHUP, NULL, &old_action);
363
error_plus(0, errno, "sigaction");
357
error(0, errno, "sigaction");
366
360
if(old_action.sa_handler != SIG_IGN){
367
361
ret = sigaction(SIGHUP, &new_action, NULL);
369
error_plus(0, errno, "sigaction");
363
error(0, errno, "sigaction");
373
367
ret = sigaction(SIGTERM, NULL, &old_action);
375
error_plus(0, errno, "sigaction");
369
error(0, errno, "sigaction");
378
372
if(old_action.sa_handler != SIG_IGN){
379
373
ret = sigaction(SIGTERM, &new_action, NULL);
381
error_plus(0, errno, "sigaction");
375
error(0, errno, "sigaction");
392
386
t_new.c_lflag &= ~(tcflag_t)ECHO;
393
387
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
395
error_plus(0, errno, "tcsetattr-echo");
389
error(0, errno, "tcsetattr-echo");
462
456
sret = write(STDOUT_FILENO, buffer + written, n - written);
465
error_plus(0, errno, "write");
459
error(0, errno, "write");
484
478
sret = close(STDOUT_FILENO);
487
error_plus(0, errno, "close");
481
error(0, errno, "close");
490
484
status = EX_OSFILE;
502
496
if(errno != EINTR and not feof(stdin)){
503
error_plus(0, errno, "getline");
497
error(0, errno, "getline");
506
500
status = EX_UNAVAILABLE;
530
523
fprintf(stderr, "Restoring terminal attributes\n");
532
525
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
533
error_plus(0, errno, "tcsetattr+echo");
526
error(0, errno, "tcsetattr+echo");
538
531
old_action.sa_handler = SIG_DFL;
539
532
ret = sigaction(signal_received, &old_action, NULL);
541
error_plus(0, errno, "sigaction");
534
error(0, errno, "sigaction");
543
536
raise(signal_received);