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237.2.23
(compared to revision 237.2.172)
: plugins.d/password-prompt.c
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- Committer: Teddy Hogeborn
- Date: 2009-01-10 03:26:15 UTC
- mto: (24.1.122 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 244.
- Revision ID: teddy@fukt.bsnet.se-20090110032615-45g8593qgkc0uga2
* Makefile (run-client): Pass $(CLIENTARGS) to plugin-runner.
(run-server): Pass $(SERVERARGS) to server.
(run-server): Pass $(SERVERARGS) to server.
- files removed:
- dbus-mandos.conf
- files renamed:
- mandos-ctl => mandos-list
- files modified:
- INSTALL
added
removed
plugins.d/password-prompt.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Password-prompt - Read a password from the terminal and print it
3
* Passprompt - Read a password from the terminal and print it
4
4
*
5
5
* Copyright © 2008,2009 Teddy Hogeborn
6
6
* Copyright © 2008,2009 Björn Påhlsson
19
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* along with this program. If not, see
20
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* <http://www.gnu.org/licenses/>.
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21
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
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* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
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* <https://www.fukt.bsnet.se/~teddy/>.
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24
*/
24
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25
26
#define _GNU_SOURCE /* getline() */
32
33
#include <signal.h> /* sig_atomic_t, raise(), struct
33
34
sigaction, sigemptyset(),
34
35
sigaction(), sigaddset(), SIGINT,
35
SIGQUIT, SIGHUP, SIGTERM,
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raise() */
36
SIGQUIT, SIGHUP, SIGTERM */
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#include <stddef.h> /* NULL, size_t, ssize_t */
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#include <sys/types.h> /* ssize_t */
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#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
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getenv() */
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getopt_long, getenv() */
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#include <stdio.h> /* fprintf(), stderr, getline(),
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stdin, feof(), perror(), fputc()
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*/
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#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
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EFAULT, EFBIG, EIO, ENOSPC, EINTR
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*/
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stdin, feof(), perror(), fputc(),
43
stdout, getopt_long */
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#include <errno.h> /* errno, EINVAL */
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#include <iso646.h> /* or, not */
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#include <stdbool.h> /* bool, false, true */
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#include <string.h> /* strlen, rindex, strncmp, strcmp */
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argp_parse(), error_t,
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ARGP_KEY_ARG, ARGP_KEY_END,
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ARGP_ERR_UNKNOWN */
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#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
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EX_UNAVAILABLE, EX_IOERR, EX_OK */
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volatile sig_atomic_t quit_now = 0;
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int signal_received;
54
volatile bool quit_now = false;
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55
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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58
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static void termination_handler(int signum){
65
if(quit_now){
66
return;
67
}
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quit_now = 1;
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signal_received = signum;
59
static void termination_handler(__attribute__((unused))int signum){
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quit_now = true;
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}
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72
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int main(int argc, char **argv){
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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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/*
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* These reproduce what we would get without ARGP_NO_HELP
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*/
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{ .name = "help", .key = '?',
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.doc = "Give this help list", .group = -1 },
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{ .name = "usage", .key = -3,
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.doc = "Give a short usage message", .group = -1 },
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{ .name = "version", .key = 'V',
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.doc = "Print program version", .group = -1 },
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{ .name = NULL }
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};
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error_t parse_opt (int key, char *arg, struct argp_state *state){
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errno = 0;
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switch (key){
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error_t parse_opt (int key, char *arg, struct argp_state *state) {
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/* Get the INPUT argument from `argp_parse', which we know is a
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pointer to our plugin list pointer. */
86
switch (key) {
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case 'p':
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prefix = arg;
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break;
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case 128:
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91
debug = true;
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break;
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/*
111
* These reproduce what we would get without ARGP_NO_HELP
112
*/
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case '?': /* --help */
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argp_state_help(state, state->out_stream,
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(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
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& ~(unsigned int)ARGP_HELP_EXIT_OK);
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case -3: /* --usage */
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argp_state_help(state, state->out_stream,
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ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
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case 'V': /* --version */
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fprintf(state->out_stream, "%s\n", argp_program_version);
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exit(argp_err_exit_status);
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case ARGP_KEY_ARG:
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argp_usage (state);
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break;
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case ARGP_KEY_END:
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97
break;
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default:
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99
return ARGP_ERR_UNKNOWN;
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100
}
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return errno;
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return 0;
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102
}
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130
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struct argp argp = { .options = options, .parser = parse_opt,
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.args_doc = "",
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.doc = "Mandos password-prompt -- Read and"
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" output a password" };
134
ret = argp_parse(&argp, argc, argv,
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ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
136
switch(ret){
137
case 0:
138
break;
139
case ENOMEM:
140
default:
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errno = ret;
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perror("argp_parse");
143
return EX_OSERR;
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case EINVAL:
145
return EX_USAGE;
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ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
109
if (ret == ARGP_ERR_UNKNOWN){
110
fprintf(stderr, "Unknown error while parsing arguments\n");
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return EXIT_FAILURE;
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112
}
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}
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if(debug){
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if (debug){
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fprintf(stderr, "Starting %s\n", argv[0]);
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117
}
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if(debug){
118
if (debug){
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fprintf(stderr, "Storing current terminal attributes\n");
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120
}
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if(tcgetattr(STDIN_FILENO, &t_old) != 0){
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int e = errno;
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if (tcgetattr(STDIN_FILENO, &t_old) != 0){
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perror("tcgetattr");
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switch(e){
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case EBADF:
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case ENOTTY:
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return EX_UNAVAILABLE;
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default:
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return EX_OSERR;
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}
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return EXIT_FAILURE;
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}
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sigemptyset(&new_action.sa_mask);
169
ret = sigaddset(&new_action.sa_mask, SIGINT);
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if(ret == -1){
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perror("sigaddset");
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return EX_OSERR;
173
}
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ret = sigaddset(&new_action.sa_mask, SIGHUP);
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if(ret == -1){
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perror("sigaddset");
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return EX_OSERR;
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}
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ret = sigaddset(&new_action.sa_mask, SIGTERM);
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if(ret == -1){
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perror("sigaddset");
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return EX_OSERR;
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}
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/* Need to check if the handler is SIG_IGN before handling:
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| [[info:libc:Initial Signal Actions]] |
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| [[info:libc:Basic Signal Handling]] |
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*/
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sigaddset(&new_action.sa_mask, SIGINT);
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sigaddset(&new_action.sa_mask, SIGHUP);
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sigaddset(&new_action.sa_mask, SIGTERM);
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ret = sigaction(SIGINT, NULL, &old_action);
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if(ret == -1){
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perror("sigaction");
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return EX_OSERR;
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return EXIT_FAILURE;
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}
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if(old_action.sa_handler != SIG_IGN){
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if (old_action.sa_handler != SIG_IGN){
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ret = sigaction(SIGINT, &new_action, NULL);
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if(ret == -1){
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perror("sigaction");
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return EX_OSERR;
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return EXIT_FAILURE;
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}
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}
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ret = sigaction(SIGHUP, NULL, &old_action);
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if(ret == -1){
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perror("sigaction");
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return EX_OSERR;
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return EXIT_FAILURE;
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}
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if(old_action.sa_handler != SIG_IGN){
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if (old_action.sa_handler != SIG_IGN){
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ret = sigaction(SIGHUP, &new_action, NULL);
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if(ret == -1){
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perror("sigaction");
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return EX_OSERR;
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return EXIT_FAILURE;
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}
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}
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ret = sigaction(SIGTERM, NULL, &old_action);
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if(ret == -1){
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perror("sigaction");
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return EX_OSERR;
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return EXIT_FAILURE;
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}
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if(old_action.sa_handler != SIG_IGN){
160
if (old_action.sa_handler != SIG_IGN){
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ret = sigaction(SIGTERM, &new_action, NULL);
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if(ret == -1){
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perror("sigaction");
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return EX_OSERR;
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return EXIT_FAILURE;
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}
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}
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if(debug){
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if (debug){
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fprintf(stderr, "Removing echo flag from terminal attributes\n");
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}
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t_new = t_old;
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t_new.c_lflag &= ~(tcflag_t)ECHO;
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if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
233
int e = errno;
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t_new.c_lflag &= ~ECHO;
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
234
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perror("tcsetattr-echo");
235
switch(e){
236
case EBADF:
237
case ENOTTY:
238
return EX_UNAVAILABLE;
239
case EINVAL:
240
default:
241
return EX_OSERR;
242
}
177
return EXIT_FAILURE;
243
178
}
244
245
if(debug){
179
180
if (debug){
246
181
fprintf(stderr, "Waiting for input from stdin \n");
247
182
}
248
183
while(true){
249
if(quit_now){
184
if (quit_now){
250
185
if(debug){
251
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fprintf(stderr, "Interrupted by signal, exiting.\n");
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187
}
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fprintf(stderr, "%s ", prefix);
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194
}
260
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{
261
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
262
const char *crypttarget = getenv("CRYPTTAB_NAME");
263
/* Before cryptsetup 1.1.0~rc2 */
264
if(cryptsource == NULL){
265
cryptsource = getenv("cryptsource");
266
}
267
if(crypttarget == NULL){
268
crypttarget = getenv("crypttarget");
269
}
270
const char *const prompt1 = "Unlocking the disk";
271
const char *const prompt2 = "Enter passphrase";
196
const char *cryptsource = getenv("cryptsource");
197
const char *crypttarget = getenv("crypttarget");
198
const char *const prompt
199
= "Enter passphrase to unlock the disk";
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200
if(cryptsource == NULL){
273
201
if(crypttarget == NULL){
274
fprintf(stderr, "%s to unlock the disk: ", prompt2);
202
fprintf(stderr, "%s: ", prompt);
275
203
} else {
276
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
277
prompt2);
204
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
278
205
}
279
206
} else {
280
207
if(crypttarget == NULL){
281
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
282
prompt2);
208
fprintf(stderr, "%s %s: ", prompt, cryptsource);
283
209
} else {
284
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
285
crypttarget, prompt2);
210
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
211
crypttarget);
286
212
}
287
213
}
288
214
}
289
215
ret = getline(&buffer, &n, stdin);
290
if(ret > 0){
216
if (ret > 0){
291
217
status = EXIT_SUCCESS;
292
218
/* Make n = data size instead of allocated buffer size */
293
219
n = (size_t)ret;
294
220
/* Strip final newline */
295
if(n > 0 and buffer[n-1] == '\n'){
221
if(n>0 and buffer[n-1] == '\n'){
296
222
buffer[n-1] = '\0'; /* not strictly necessary */
297
223
n--;
298
224
}
300
226
while(written < n){
301
227
ret = write(STDOUT_FILENO, buffer + written, n - written);
302
228
if(ret < 0){
303
int e = errno;
304
229
perror("write");
305
switch(e){
306
case EBADF:
307
case EFAULT:
308
case EINVAL:
309
case EFBIG:
310
case EIO:
311
case ENOSPC:
312
default:
313
status = EX_IOERR;
314
break;
315
case EINTR:
316
status = EXIT_FAILURE;
317
break;
318
}
230
status = EXIT_FAILURE;
319
231
break;
320
232
}
321
233
written += (size_t)ret;
322
234
}
323
ret = close(STDOUT_FILENO);
324
if(ret == -1){
325
int e = errno;
326
perror("close");
327
switch(e){
328
case EBADF:
329
status = EX_OSFILE;
330
break;
331
case EIO:
332
default:
333
status = EX_IOERR;
334
break;
335
}
336
}
337
235
break;
338
236
}
339
if(ret < 0){
340
int e = errno;
341
if(errno != EINTR and not feof(stdin)){
237
if (ret < 0){
238
if (errno != EINTR and not feof(stdin)){
342
239
perror("getline");
343
switch(e){
344
case EBADF:
345
status = EX_UNAVAILABLE;
346
case EIO:
347
case EINVAL:
348
default:
349
status = EX_IOERR;
350
break;
351
}
240
status = EXIT_FAILURE;
352
241
break;
353
242
}
354
243
}
356
245
read from stdin */
357
246
fputc('\n', stderr);
358
247
if(debug and not quit_now){
359
/* If quit_now is nonzero, we were interrupted by a signal, and
248
/* If quit_now is true, we were interrupted by a signal, and
360
249
will print that later, so no need to show this too. */
361
250
fprintf(stderr, "getline() returned 0, retrying.\n");
362
251
}
364
253
365
254
free(buffer);
366
255
367
if(debug){
256
if (debug){
368
257
fprintf(stderr, "Restoring terminal attributes\n");
369
258
}
370
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
259
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
371
260
perror("tcsetattr+echo");
372
261
}
373
262
374
if(quit_now){
375
sigemptyset(&old_action.sa_mask);
376
old_action.sa_handler = SIG_DFL;
377
ret = sigaction(signal_received, &old_action, NULL);
378
if(ret == -1){
379
perror("sigaction");
380
}
381
raise(signal_received);
382
}
383
384
if(debug){
263
if (debug){
385
264
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
386
265
status);
387
266
}
388
if(status == EXIT_SUCCESS or status == EX_OK){
267
if(status == EXIT_SUCCESS){
389
268
fputc('\n', stderr);
390
269
}
391
270
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