32
32
#include <signal.h> /* sig_atomic_t, raise(), struct
33
33
sigaction, sigemptyset(),
34
34
sigaction(), sigaddset(), SIGINT,
35
SIGQUIT, SIGHUP, SIGTERM,
37
#include <stddef.h> /* NULL, size_t, ssize_t */
35
SIGQUIT, SIGHUP, SIGTERM */
36
#include <stddef.h> /* NULL, size_t */
38
37
#include <sys/types.h> /* ssize_t */
39
38
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
40
getopt_long, getenv() */
41
40
#include <stdio.h> /* fprintf(), stderr, getline(),
42
41
stdin, feof(), perror(), fputc(),
44
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
45
EFAULT, EFBIG, EIO, ENOSPC, EINTR
42
stdout, getopt_long */
43
#include <errno.h> /* errno, EINVAL */
47
44
#include <iso646.h> /* or, not */
48
45
#include <stdbool.h> /* bool, false, true */
49
46
#include <string.h> /* strlen, rindex, strncmp, strcmp */
50
#include <argp.h> /* struct argp_option, struct
51
argp_state, struct argp,
52
argp_parse(), error_t,
53
ARGP_KEY_ARG, ARGP_KEY_END,
55
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
56
EX_UNAVAILABLE, EX_IOERR, EX_OK */
47
#include <getopt.h> /* getopt_long */
58
volatile sig_atomic_t quit_now = 0;
49
volatile bool quit_now = false;
60
50
bool debug = false;
61
const char *argp_program_version = "password-prompt " VERSION;
62
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
64
static void termination_handler(int signum){
69
signal_received = signum;
52
static void termination_handler(__attribute__((unused))int signum){
72
56
int main(int argc, char **argv){
79
63
struct sigaction old_action,
80
64
new_action = { .sa_handler = termination_handler,
83
struct argp_option options[] = {
84
{ .name = "prefix", .key = 'p',
85
.arg = "PREFIX", .flags = 0,
86
.doc = "Prefix shown before the prompt", .group = 2 },
87
{ .name = "debug", .key = 128,
88
.doc = "Debug mode", .group = 3 },
92
error_t parse_opt (int key, char *arg, struct argp_state *state){
106
return ARGP_ERR_UNKNOWN;
68
static struct option long_options[] = {
69
{"debug", no_argument, (int *)&debug, 1},
70
{"prefix", required_argument, 0, 'p'},
74
ret = getopt_long (argc, argv, "p:", long_options, &option_index);
111
struct argp argp = { .options = options, .parser = parse_opt,
113
.doc = "Mandos password-prompt -- Read and"
114
" output a password" };
115
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
116
if(ret == ARGP_ERR_UNKNOWN){
117
fprintf(stderr, "Unknown error while parsing arguments\n");
87
fprintf(stderr, "bad arguments\n");
123
93
fprintf(stderr, "Starting %s\n", argv[0]);
126
96
fprintf(stderr, "Storing current terminal attributes\n");
129
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
135
return EX_UNAVAILABLE;
99
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
141
103
sigemptyset(&new_action.sa_mask);
142
ret = sigaddset(&new_action.sa_mask, SIGINT);
147
ret = sigaddset(&new_action.sa_mask, SIGHUP);
152
ret = sigaddset(&new_action.sa_mask, SIGTERM);
157
/* Need to check if the handler is SIG_IGN before handling:
158
| [[info:libc:Initial Signal Actions]] |
159
| [[info:libc:Basic Signal Handling]] |
161
ret = sigaction(SIGINT, NULL, &old_action);
166
if(old_action.sa_handler != SIG_IGN){
167
ret = sigaction(SIGINT, &new_action, NULL);
173
ret = sigaction(SIGHUP, NULL, &old_action);
178
if(old_action.sa_handler != SIG_IGN){
179
ret = sigaction(SIGHUP, &new_action, NULL);
185
ret = sigaction(SIGTERM, NULL, &old_action);
190
if(old_action.sa_handler != SIG_IGN){
191
ret = sigaction(SIGTERM, &new_action, NULL);
104
sigaddset(&new_action.sa_mask, SIGINT);
105
sigaddset(&new_action.sa_mask, SIGHUP);
106
sigaddset(&new_action.sa_mask, SIGTERM);
107
sigaction(SIGINT, NULL, &old_action);
108
if (old_action.sa_handler != SIG_IGN)
109
sigaction(SIGINT, &new_action, NULL);
110
sigaction(SIGHUP, NULL, &old_action);
111
if (old_action.sa_handler != SIG_IGN)
112
sigaction(SIGHUP, &new_action, NULL);
113
sigaction(SIGTERM, NULL, &old_action);
114
if (old_action.sa_handler != SIG_IGN)
115
sigaction(SIGTERM, &new_action, NULL);
200
119
fprintf(stderr, "Removing echo flag from terminal attributes\n");
204
t_new.c_lflag &= ~(tcflag_t)ECHO;
205
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
123
t_new.c_lflag &= ~ECHO;
124
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
207
125
perror("tcsetattr-echo");
211
return EX_UNAVAILABLE;
219
130
fprintf(stderr, "Waiting for input from stdin \n");
224
fprintf(stderr, "Interrupted by signal, exiting.\n");
226
134
status = EXIT_FAILURE;
231
fprintf(stderr, "%s ", prefix);
234
const char *cryptsource = getenv("cryptsource");
235
const char *crypttarget = getenv("crypttarget");
236
const char *const prompt
237
= "Enter passphrase to unlock the disk";
238
if(cryptsource == NULL){
239
if(crypttarget == NULL){
240
fprintf(stderr, "%s: ", prompt);
242
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
245
if(crypttarget == NULL){
246
fprintf(stderr, "%s %s: ", prompt, cryptsource);
248
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
139
fprintf(stderr, "%s Password: ", prefix);
141
fprintf(stderr, "Password: ");
253
143
ret = getline(&buffer, &n, stdin);
145
fprintf(stdout, "%s", buffer);
255
146
status = EXIT_SUCCESS;
256
/* Make n = data size instead of allocated buffer size */
258
/* Strip final newline */
259
if(n > 0 and buffer[n-1] == '\n'){
260
buffer[n-1] = '\0'; /* not strictly necessary */
265
ret = write(STDOUT_FILENO, buffer + written, n - written);
280
status = EXIT_FAILURE;
285
written += (size_t)ret;
287
ret = close(STDOUT_FILENO);
305
if(errno != EINTR and not feof(stdin)){
149
// ret == 0 makes no other sence than to retry to read from stdin
151
if (errno != EINTR and not feof(stdin)){
306
152
perror("getline");
309
status = EX_UNAVAILABLE;
153
status = EXIT_FAILURE;
319
/* if(ret == 0), then the only sensible thing to do is to retry to
321
157
fputc('\n', stderr);
322
if(debug and not quit_now){
323
/* If quit_now is nonzero, we were interrupted by a signal, and
324
will print that later, so no need to show this too. */
325
fprintf(stderr, "getline() returned 0, retrying.\n");
332
161
fprintf(stderr, "Restoring terminal attributes\n");
334
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
163
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
335
164
perror("tcsetattr+echo");
339
sigemptyset(&old_action.sa_mask);
340
old_action.sa_handler = SIG_DFL;
341
ret = sigaction(signal_received, &old_action, NULL);
345
raise(signal_received);
349
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
352
if(status == EXIT_SUCCESS or status == EX_OK){
168
fprintf(stderr, "%s is exiting\n", argv[0]);