1
1
/* -*- coding: utf-8 -*- */
3
* Passprompt - Read a password from a FIFO and output it
3
* Askpass-FIFO - Read a password from a FIFO and output it
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 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 <https://www.fukt.bsnet.se/~belorn/> and
23
* <https://www.fukt.bsnet.se/~teddy/>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
26
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
27
26
#include <sys/types.h> /* ssize_t */
28
27
#include <sys/stat.h> /* mkfifo(), S_IRUSR, S_IWUSR */
29
28
#include <iso646.h> /* and */
30
#include <errno.h> /* errno, EEXIST */
31
#include <stdio.h> /* perror() */
32
#include <stdlib.h> /* EXIT_FAILURE, NULL, size_t, free(),
29
#include <errno.h> /* errno, EACCES, ENOTDIR, ELOOP,
30
ENAMETOOLONG, ENOSPC, EROFS,
31
ENOENT, EEXIST, EFAULT, EMFILE,
32
ENFILE, ENOMEM, EBADF, EINVAL, EIO,
34
#include <error.h> /* error() */
35
#include <stdio.h> /* fprintf(), vfprintf(),
37
#include <stdlib.h> /* EXIT_FAILURE, NULL, size_t, free(),
33
38
realloc(), EXIT_SUCCESS */
34
39
#include <fcntl.h> /* open(), O_RDONLY */
35
40
#include <unistd.h> /* read(), close(), write(),
42
#include <sysexits.h> /* EX_OSERR, EX_OSFILE,
43
EX_UNAVAILABLE, EX_IOERR */
44
#include <string.h> /* strerror() */
45
#include <stdarg.h> /* va_list, va_start(), ... */
48
/* Function to use when printing errors */
49
void error_plus(int status, int errnum, const char *formatstring,
55
va_start(ap, formatstring);
56
ret = vasprintf(&text, formatstring, ap);
58
fprintf(stderr, "Mandos plugin %s: ",
59
program_invocation_short_name);
60
vfprintf(stderr, formatstring, ap);
61
fprintf(stderr, ": ");
62
fprintf(stderr, "%s\n", strerror(errnum));
63
error(status, errno, "vasprintf while printing error");
66
fprintf(stderr, "Mandos plugin ");
67
error(status, errnum, "%s", text);
39
71
int main(__attribute__((unused))int argc,
40
72
__attribute__((unused))char **argv){
45
77
const char passfifo[] = "/lib/cryptsetup/passfifo";
46
ret = TEMP_FAILURE_RETRY(mkfifo(passfifo, S_IRUSR | S_IWUSR));
47
if(ret == -1 and errno != EEXIST){
78
ret = mkfifo(passfifo, S_IRUSR | S_IWUSR);
85
error_plus(EX_OSFILE, errno, "mkfifo");
90
error_plus(EX_OSERR, errno, "mkfifo");
92
/* no "/lib/cryptsetup"? */
93
error_plus(EX_UNAVAILABLE, errno, "mkfifo");
95
break; /* not an error */
53
int fifo_fd = TEMP_FAILURE_RETRY(open(passfifo, O_RDONLY));
100
int fifo_fd = open(passfifo, O_RDONLY);
54
101
if(fifo_fd == -1){
103
error_plus(0, errno, "open");
108
return EX_UNAVAILABLE;
59
121
/* Read from FIFO */
63
125
size_t buf_allocated = 0;
64
126
const size_t blocksize = 1024;
66
128
if(buf_len + blocksize > buf_allocated){
67
129
char *tmp = realloc(buf, buf_allocated + blocksize);
131
error_plus(0, errno, "realloc");
74
136
buf_allocated += blocksize;
76
sret = TEMP_FAILURE_RETRY(read(fifo_fd, buf + buf_len,
77
buf_allocated - buf_len));
138
sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
143
error_plus(0, errno, "read");
153
return EX_UNAVAILABLE;
83
156
buf_len += (size_t)sret;
88
TEMP_FAILURE_RETRY(close(fifo_fd));
90
163
/* Print password to stdout */
91
164
size_t written = 0;
92
165
while(written < buf_len){
93
sret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buf + written,
166
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
171
error_plus(0, errno, "write");
100
184
written += (size_t)sret;
188
ret = close(STDOUT_FILENO);
191
error_plus(0, errno, "close");
104
200
return EXIT_SUCCESS;