34
9
sigaction, sigemptyset(),
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10
sigaction(), sigaddset(), SIGINT,
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11
SIGQUIT, SIGHUP, SIGTERM */
37
#include <stddef.h> /* NULL, size_t, ssize_t */
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#include <stddef.h> /* NULL, size_t */
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13
#include <sys/types.h> /* ssize_t */
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#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
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getopt_long, getenv() */
14
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE */
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15
#include <stdio.h> /* fprintf(), stderr, getline(),
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16
stdin, feof(), perror(), fputc(),
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stdout, getopt_long */
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18
#include <errno.h> /* errno, EINVAL */
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19
#include <iso646.h> /* or, not */
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20
#include <stdbool.h> /* bool, false, true */
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21
#include <string.h> /* strlen, rindex, strncmp, strcmp */
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#include <argp.h> /* struct argp_option, struct
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argp_state, struct argp,
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argp_parse(), error_t,
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ARGP_KEY_ARG, ARGP_KEY_END,
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23
volatile bool quit_now = false;
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24
bool debug = false;
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const char *argp_program_version = "password-prompt " VERSION;
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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static void termination_handler(__attribute__((unused))int signum){
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void termination_handler(int signum){
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30
int main(int argc, char **argv){
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33
struct termios t_new, t_old;
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34
char *buffer = NULL;
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35
int status = EXIT_SUCCESS;
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36
struct sigaction old_action,
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37
new_action = { .sa_handler = termination_handler,
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struct argp_option options[] = {
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{ .name = "prefix", .key = 'p',
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.arg = "PREFIX", .flags = 0,
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.doc = "Prefix shown before the prompt", .group = 2 },
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{ .name = "debug", .key = 128,
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.doc = "Debug mode", .group = 3 },
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error_t parse_opt (int key, char *arg, struct argp_state *state) {
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const char db[] = "--debug";
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char *basename = rindex(argv[0], '/');
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char *program_name = malloc(strlen(basename) + sizeof(db));
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if (program_name == NULL){
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program_name[0] = '\0';
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for (int i = 1; i < argc; i++){
56
if (not strncmp(argv[i], db, 5)){
57
strcat(strcat(strcat(program_name, db ), "="), basename);
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if(not strcmp(argv[i], db) or not strcmp(argv[i], program_name)){
97
return ARGP_ERR_UNKNOWN;
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struct argp argp = { .options = options, .parser = parse_opt,
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.doc = "Mandos password-prompt -- Read and"
105
" output a password" };
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ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
107
if(ret == ARGP_ERR_UNKNOWN){
108
fprintf(stderr, "Unknown error while parsing arguments\n");
114
66
fprintf(stderr, "Starting %s\n", argv[0]);
117
69
fprintf(stderr, "Storing current terminal attributes\n");
120
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
72
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
122
73
return EXIT_FAILURE;
125
76
sigemptyset(&new_action.sa_mask);
126
77
sigaddset(&new_action.sa_mask, SIGINT);
78
sigaddset(&new_action.sa_mask, SIGQUIT);
127
79
sigaddset(&new_action.sa_mask, SIGHUP);
128
80
sigaddset(&new_action.sa_mask, SIGTERM);
129
ret = sigaction(SIGINT, NULL, &old_action);
134
if(old_action.sa_handler != SIG_IGN){
135
ret = sigaction(SIGINT, &new_action, NULL);
141
ret = sigaction(SIGHUP, NULL, &old_action);
146
if(old_action.sa_handler != SIG_IGN){
147
ret = sigaction(SIGHUP, &new_action, NULL);
153
ret = sigaction(SIGTERM, NULL, &old_action);
158
if(old_action.sa_handler != SIG_IGN){
159
ret = sigaction(SIGTERM, &new_action, NULL);
81
sigaction(SIGINT, NULL, &old_action);
82
if (old_action.sa_handler != SIG_IGN)
83
sigaction(SIGINT, &new_action, NULL);
84
sigaction(SIGQUIT, NULL, &old_action);
85
if (old_action.sa_handler != SIG_IGN)
86
sigaction(SIGQUIT, &new_action, NULL);
87
sigaction(SIGHUP, NULL, &old_action);
88
if (old_action.sa_handler != SIG_IGN)
89
sigaction(SIGHUP, &new_action, NULL);
90
sigaction(SIGTERM, NULL, &old_action);
91
if (old_action.sa_handler != SIG_IGN)
92
sigaction(SIGTERM, &new_action, NULL);
168
96
fprintf(stderr, "Removing echo flag from terminal attributes\n");
172
100
t_new.c_lflag &= ~ECHO;
173
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
101
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
174
102
perror("tcsetattr-echo");
175
103
return EXIT_FAILURE;
179
107
fprintf(stderr, "Waiting for input from stdin \n");
184
fprintf(stderr, "Interrupted by signal, exiting.\n");
186
111
status = EXIT_FAILURE;
191
fprintf(stderr, "%s ", prefix);
194
const char *cryptsource = getenv("cryptsource");
195
const char *crypttarget = getenv("crypttarget");
196
const char *const prompt
197
= "Enter passphrase to unlock the disk";
198
if(cryptsource == NULL){
199
if(crypttarget == NULL){
200
fprintf(stderr, "%s: ", prompt);
202
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
205
if(crypttarget == NULL){
206
fprintf(stderr, "%s %s: ", prompt, cryptsource);
208
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
114
fprintf(stderr, "Password: ");
213
115
ret = getline(&buffer, &n, stdin);
117
fprintf(stdout, "%s", buffer);
215
118
status = EXIT_SUCCESS;
216
/* Make n = data size instead of allocated buffer size */
218
/* Strip final newline */
219
if(n>0 and buffer[n-1] == '\n'){
220
buffer[n-1] = '\0'; /* not strictly necessary */
225
ret = write(STDOUT_FILENO, buffer + written, n - written);
228
status = EXIT_FAILURE;
231
written += (size_t)ret;
236
if(errno != EINTR and not feof(stdin)){
121
// ret == 0 makes no other sence than to retry to read from stdin
123
if (errno != EINTR and not feof(stdin)){
237
124
perror("getline");
238
125
status = EXIT_FAILURE;
242
/* if(ret == 0), then the only sensible thing to do is to retry to
244
129
fputc('\n', stderr);
245
if(debug and not quit_now){
246
/* If quit_now is true, we were interrupted by a signal, and
247
will print that later, so no need to show this too. */
248
fprintf(stderr, "getline() returned 0, retrying.\n");
255
133
fprintf(stderr, "Restoring terminal attributes\n");
257
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
135
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
258
136
perror("tcsetattr+echo");
262
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
265
if(status == EXIT_SUCCESS){
140
fprintf(stderr, "%s is exiting\n", argv[0]);