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- Committer: Teddy Hogeborn
- Date: 2009-02-25 01:47:45 UTC
- mfrom: (237.2.18 mandos-release)
- Revision ID: teddy@fukt.bsnet.se-20090225014745-8yyzt3b2q56nzk9l
Merge from release branch.
added
removed
plugins.d/password-prompt.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
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2
/*
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* Password-prompt - Read a password from the terminal and print it
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*
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* Copyright © 2008-2010 Teddy Hogeborn
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* Copyright © 2008-2010 Björn Påhlsson
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* Copyright © 2008,2009 Teddy Hogeborn
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* Copyright © 2008,2009 Björn Påhlsson
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*
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* 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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*/
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#define _GNU_SOURCE /* getline() */
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#include <signal.h> /* sig_atomic_t, raise(), struct
33
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sigaction, sigemptyset(),
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sigaction(), sigaddset(), SIGINT,
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SIGQUIT, SIGHUP, SIGTERM,
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raise() */
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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(), 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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#include <error.h> /* error() */
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stdin, feof(), perror(), fputc(),
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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 */
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#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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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;
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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(int signum){
66
if(quit_now){
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return;
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}
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static void termination_handler(__attribute__((unused))int signum){
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quit_now = 1;
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signal_received = signum;
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}
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int main(int argc, char **argv){
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ssize_t sret;
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int ret;
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ssize_t ret;
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size_t n;
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struct termios t_new, t_old;
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char *buffer = NULL;
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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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case 'p':
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prefix = arg;
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case 128:
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debug = true;
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break;
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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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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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break;
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96
default:
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return ARGP_ERR_UNKNOWN;
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98
}
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return errno;
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return 0;
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}
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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" };
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ret = argp_parse(&argp, argc, argv,
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ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
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switch(ret){
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case 0:
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break;
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case ENOMEM:
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default:
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errno = ret;
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error(0, errno, "argp_parse");
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return EX_OSERR;
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case EINVAL:
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return EX_USAGE;
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ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
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if(ret == ARGP_ERR_UNKNOWN){
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fprintf(stderr, "Unknown error while parsing arguments\n");
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return EXIT_FAILURE;
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}
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}
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112
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}
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if(tcgetattr(STDIN_FILENO, &t_old) != 0){
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int e = errno;
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error(0, errno, "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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perror("tcgetattr");
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return EXIT_FAILURE;
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}
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sigemptyset(&new_action.sa_mask);
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ret = sigaddset(&new_action.sa_mask, SIGINT);
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if(ret == -1){
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error(0, errno, "sigaddset");
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return EX_OSERR;
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}
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ret = sigaddset(&new_action.sa_mask, SIGHUP);
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if(ret == -1){
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error(0, errno, "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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error(0, errno, "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:
187
| [[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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error(0, errno, "sigaction");
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return EX_OSERR;
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perror("sigaction");
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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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ret = sigaction(SIGINT, &new_action, NULL);
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if(ret == -1){
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error(0, errno, "sigaction");
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return EX_OSERR;
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perror("sigaction");
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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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error(0, errno, "sigaction");
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return EX_OSERR;
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perror("sigaction");
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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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ret = sigaction(SIGHUP, &new_action, NULL);
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if(ret == -1){
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error(0, errno, "sigaction");
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return EX_OSERR;
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perror("sigaction");
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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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error(0, errno, "sigaction");
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return EX_OSERR;
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perror("sigaction");
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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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ret = sigaction(SIGTERM, &new_action, NULL);
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if(ret == -1){
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error(0, errno, "sigaction");
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return EX_OSERR;
161
perror("sigaction");
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return EXIT_FAILURE;
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}
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}
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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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t_new.c_lflag &= ~ECHO;
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if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
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int e = errno;
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error(0, errno, "tcsetattr-echo");
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switch(e){
238
case EBADF:
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case ENOTTY:
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return EX_UNAVAILABLE;
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case EINVAL:
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default:
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return EX_OSERR;
244
}
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perror("tcsetattr-echo");
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return EXIT_FAILURE;
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}
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177
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if(debug){
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fprintf(stderr, "Waiting for input from stdin \n");
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}
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191
fprintf(stderr, "%s ", prefix);
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192
}
262
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{
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const char *cryptsource = getenv("CRYPTTAB_SOURCE");
264
const char *crypttarget = getenv("CRYPTTAB_NAME");
265
/* Before cryptsetup 1.1.0~rc2 */
266
if(cryptsource == NULL){
267
cryptsource = getenv("cryptsource");
268
}
269
if(crypttarget == NULL){
270
crypttarget = getenv("crypttarget");
271
}
272
const char *const prompt1 = "Unlocking the disk";
273
const char *const prompt2 = "Enter passphrase";
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const char *cryptsource = getenv("cryptsource");
195
const char *crypttarget = getenv("crypttarget");
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const char *const prompt
197
= "Enter passphrase to unlock the disk";
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if(cryptsource == NULL){
275
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if(crypttarget == NULL){
276
fprintf(stderr, "%s to unlock the disk: ", prompt2);
200
fprintf(stderr, "%s: ", prompt);
277
201
} else {
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fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
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prompt2);
202
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
280
203
}
281
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} else {
282
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if(crypttarget == NULL){
283
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
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prompt2);
206
fprintf(stderr, "%s %s: ", prompt, cryptsource);
285
207
} else {
286
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
287
crypttarget, prompt2);
208
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
209
crypttarget);
288
210
}
289
211
}
290
212
}
291
sret = getline(&buffer, &n, stdin);
292
if(sret > 0){
213
ret = getline(&buffer, &n, stdin);
214
if(ret > 0){
293
215
status = EXIT_SUCCESS;
294
216
/* Make n = data size instead of allocated buffer size */
295
n = (size_t)sret;
217
n = (size_t)ret;
296
218
/* Strip final newline */
297
if(n > 0 and buffer[n-1] == '\n'){
219
if(n>0 and buffer[n-1] == '\n'){
298
220
buffer[n-1] = '\0'; /* not strictly necessary */
299
221
n--;
300
222
}
301
223
size_t written = 0;
302
224
while(written < n){
303
sret = write(STDOUT_FILENO, buffer + written, n - written);
304
if(sret < 0){
305
int e = errno;
306
error(0, errno, "write");
307
switch(e){
308
case EBADF:
309
case EFAULT:
310
case EINVAL:
311
case EFBIG:
312
case EIO:
313
case ENOSPC:
314
default:
315
status = EX_IOERR;
316
break;
317
case EINTR:
318
status = EXIT_FAILURE;
319
break;
320
}
321
break;
322
}
323
written += (size_t)sret;
324
}
325
sret = close(STDOUT_FILENO);
326
if(sret == -1){
327
int e = errno;
328
error(0, errno, "close");
329
switch(e){
330
case EBADF:
331
status = EX_OSFILE;
332
break;
333
case EIO:
334
default:
335
status = EX_IOERR;
336
break;
337
}
225
ret = write(STDOUT_FILENO, buffer + written, n - written);
226
if(ret < 0){
227
perror("write");
228
status = EXIT_FAILURE;
229
break;
230
}
231
written += (size_t)ret;
338
232
}
339
233
break;
340
234
}
341
if(sret < 0){
342
int e = errno;
235
if(ret < 0){
343
236
if(errno != EINTR and not feof(stdin)){
344
error(0, errno, "getline");
345
switch(e){
346
case EBADF:
347
status = EX_UNAVAILABLE;
348
case EIO:
349
case EINVAL:
350
default:
351
status = EX_IOERR;
352
break;
353
}
237
perror("getline");
238
status = EXIT_FAILURE;
354
239
break;
355
240
}
356
241
}
357
/* if(sret == 0), then the only sensible thing to do is to retry to
242
/* if(ret == 0), then the only sensible thing to do is to retry to
358
243
read from stdin */
359
244
fputc('\n', stderr);
360
if(debug and not quit_now){
245
if(debug and quit_now == 0){
361
246
/* If quit_now is nonzero, we were interrupted by a signal, and
362
247
will print that later, so no need to show this too. */
363
248
fprintf(stderr, "getline() returned 0, retrying.\n");
370
255
fprintf(stderr, "Restoring terminal attributes\n");
371
256
}
372
257
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
373
error(0, errno, "tcsetattr+echo");
374
}
375
376
if(quit_now){
377
sigemptyset(&old_action.sa_mask);
378
old_action.sa_handler = SIG_DFL;
379
ret = sigaction(signal_received, &old_action, NULL);
380
if(ret == -1){
381
error(0, errno, "sigaction");
382
}
383
raise(signal_received);
258
perror("tcsetattr+echo");
384
259
}
385
260
386
261
if(debug){
387
262
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
388
263
status);
389
264
}
390
if(status == EXIT_SUCCESS or status == EX_OK){
265
if(status == EXIT_SUCCESS){
391
266
fputc('\n', stderr);
392
267
}
393
268
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