3
3
* Password-prompt - Read a password from the terminal and print it
5
* Copyright © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 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() */
27
#include <termios.h> /* struct termios, tcsetattr(),
27
#include <termios.h> /* struct termios, tcsetattr(),
28
28
TCSAFLUSH, tcgetattr(), ECHO */
29
29
#include <unistd.h> /* struct termios, tcsetattr(),
30
30
STDIN_FILENO, TCSAFLUSH,
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()
46
46
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
47
47
EFAULT, EFBIG, EIO, ENOSPC, EINTR
50
50
#include <iso646.h> /* or, not */
51
51
#include <stdbool.h> /* bool, false, true */
52
52
#include <inttypes.h> /* strtoumax() */
53
#include <sys/stat.h> /* struct stat, lstat(), open() */
54
#include <string.h> /* strlen, rindex, memcmp, strerror()
53
#include <sys/stat.h> /* struct stat, lstat(), open() */
54
#include <string.h> /* strlen, rindex, memcmp */
56
55
#include <argp.h> /* struct argp_option, struct
57
56
argp_state, struct argp,
58
57
argp_parse(), error_t,
61
60
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
62
61
EX_UNAVAILABLE, EX_IOERR, EX_OK */
63
62
#include <fcntl.h> /* open() */
64
#include <stdarg.h> /* va_list, va_start(), ... */
66
64
volatile sig_atomic_t quit_now = 0;
67
65
int signal_received;
68
66
bool debug = false;
69
67
const char *argp_program_version = "password-prompt " VERSION;
70
const char *argp_program_bug_address = "<mandos@recompile.se>";
68
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
70
/* Needed for conflict resolution */
73
71
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
/* Function to use when printing errors */
86
__attribute__((format (gnu_printf, 3, 4)))
87
void error_plus(int status, int errnum, const char *formatstring,
93
va_start(ap, formatstring);
94
ret = vasprintf(&text, formatstring, ap);
96
fprintf(stderr, "Mandos plugin %s: ",
97
program_invocation_short_name);
98
vfprintf(stderr, formatstring, ap);
99
fprintf(stderr, ": %s\n", strerror(errnum));
100
error(status, errno, "vasprintf while printing error");
103
fprintf(stderr, "Mandos plugin ");
104
error(status, errnum, "%s", text);
72
const char plymouth_alt_name[] = "plymouthd";
108
75
static void termination_handler(int signum){
119
86
from the terminal. Password-prompt will exit if it detects
120
87
plymouth since plymouth performs the same functionality.
122
__attribute__((nonnull))
123
89
int is_plymouth(const struct dirent *proc_entry){
130
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
96
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
132
98
if(errno != 0 or *tmp != '\0'
133
or proc_id != (uintmax_t)((pid_t)proc_id)){
99
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
138
104
char *cmdline_filename;
139
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
105
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline", proc_entry->d_name);
142
error_plus(0, errno, "asprintf");
107
error(0, errno, "asprintf");
146
/* Open /proc/<pid>/cmdline */
111
/* Open /proc/<pid>/cmdline */
147
112
cl_fd = open(cmdline_filename, O_RDONLY);
148
113
free(cmdline_filename);
151
error_plus(0, errno, "open");
115
error(0, errno, "open");
165
128
if(cmdline_len + blocksize + 1 > cmdline_allocated){
166
129
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
168
error_plus(0, errno, "realloc");
131
error(0, errno, "realloc");
203
166
cmdline_base = cmdline;
206
if(strcmp(cmdline_base, plymouth_name) != 0){
208
fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
169
if((strcmp(cmdline_base, plymouth_name) != 0)
170
and (strcmp(cmdline_base, plymouth_alt_name) != 0)){
215
fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
222
struct dirent **direntries = NULL;
178
struct dirent **direntries;
224
180
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
226
error_plus(1, errno, "scandir");
182
error(1, errno, "scandir");
339
293
sigemptyset(&new_action.sa_mask);
340
294
ret = sigaddset(&new_action.sa_mask, SIGINT);
342
error_plus(0, errno, "sigaddset");
296
error(0, errno, "sigaddset");
345
299
ret = sigaddset(&new_action.sa_mask, SIGHUP);
347
error_plus(0, errno, "sigaddset");
301
error(0, errno, "sigaddset");
350
304
ret = sigaddset(&new_action.sa_mask, SIGTERM);
352
error_plus(0, errno, "sigaddset");
306
error(0, errno, "sigaddset");
355
309
/* Need to check if the handler is SIG_IGN before handling:
359
313
ret = sigaction(SIGINT, NULL, &old_action);
361
error_plus(0, errno, "sigaction");
315
error(0, errno, "sigaction");
364
318
if(old_action.sa_handler != SIG_IGN){
365
319
ret = sigaction(SIGINT, &new_action, NULL);
367
error_plus(0, errno, "sigaction");
321
error(0, errno, "sigaction");
371
325
ret = sigaction(SIGHUP, NULL, &old_action);
373
error_plus(0, errno, "sigaction");
327
error(0, errno, "sigaction");
376
330
if(old_action.sa_handler != SIG_IGN){
377
331
ret = sigaction(SIGHUP, &new_action, NULL);
379
error_plus(0, errno, "sigaction");
333
error(0, errno, "sigaction");
383
337
ret = sigaction(SIGTERM, NULL, &old_action);
385
error_plus(0, errno, "sigaction");
339
error(0, errno, "sigaction");
388
342
if(old_action.sa_handler != SIG_IGN){
389
343
ret = sigaction(SIGTERM, &new_action, NULL);
391
error_plus(0, errno, "sigaction");
345
error(0, errno, "sigaction");
402
356
t_new.c_lflag &= ~(tcflag_t)ECHO;
403
357
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
405
error_plus(0, errno, "tcsetattr-echo");
359
error(0, errno, "tcsetattr-echo");
527
/* if(sret == 0), then the only sensible thing to do is to retry
528
to read from stdin */
480
/* if(sret == 0), then the only sensible thing to do is to retry to
529
482
fputc('\n', stderr);
530
483
if(debug and not quit_now){
531
484
/* If quit_now is nonzero, we were interrupted by a signal, and
540
493
fprintf(stderr, "Restoring terminal attributes\n");
542
495
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
543
error_plus(0, errno, "tcsetattr+echo");
496
error(0, errno, "tcsetattr+echo");
548
501
old_action.sa_handler = SIG_DFL;
549
502
ret = sigaction(signal_received, &old_action, NULL);
551
error_plus(0, errno, "sigaction");
504
error(0, errno, "sigaction");
553
506
raise(signal_received);