src/ask-password.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <sys/socket.h>
  23 #include <sys/poll.h>
  24 #include <sys/types.h>
  25 #include <assert.h>
  26 #include <string.h>
  27 #include <errno.h>
  28 #include <unistd.h>
  29 #include <fcntl.h>
  30 #include <sys/un.h>
  31 #include <sys/stat.h>
  32 #include <sys/signalfd.h>
  33 #include <getopt.h>
  34 #include <termios.h>
  35 #include <limits.h>
  36 #include <stddef.h>
  37
  38 #include "log.h"
  39 #include "macro.h"
  40 #include "util.h"
  41 #include "strv.h"
  42 #include "ask-password-api.h"
  43 #include "def.h"
  44
  45 static const char *arg_icon = NULL;
  46 static const char *arg_message = NULL;
  47 static bool arg_use_tty = true;
  48 static usec_t arg_timeout = DEFAULT_TIMEOUT_USEC;
  49 static bool arg_accept_cached = false;
  50 static bool arg_multiple = false;
  51
  52 static int help(void) {
  53
  54         printf("%s [OPTIONS...] MESSAGE\n\n"
  55                "Query the user for a system passphrase, via the TTY or an UI agent.\n\n"
  56                "  -h --help          Show this help\n"
  57                "     --icon=NAME     Icon name\n"
  58                "     --timeout=SEC   Timeout in sec\n"
  59                "     --no-tty        Ask question via agent even on TTY\n"
  60                "     --accept-cached Accept cached passwords\n"
  61                "     --multiple      List multiple passwords if available\n",
  62                program_invocation_short_name);
  63
  64         return 0;
  65 }
  66
  67 static int parse_argv(int argc, char *argv[]) {
  68
  69         enum {
  70                 ARG_ICON = 0x100,
  71                 ARG_TIMEOUT,
  72                 ARG_NO_TTY,
  73                 ARG_ACCEPT_CACHED,
  74                 ARG_MULTIPLE
  75         };
  76
  77         static const struct option options[] = {
  78                 { "help",          no_argument,       NULL, 'h'               },
  79                 { "icon",          required_argument, NULL, ARG_ICON          },
  80                 { "timeout",       required_argument, NULL, ARG_TIMEOUT       },
  81                 { "no-tty",        no_argument,       NULL, ARG_NO_TTY        },
  82                 { "accept-cached", no_argument,       NULL, ARG_ACCEPT_CACHED },
  83                 { "multiple",      no_argument,       NULL, ARG_MULTIPLE      },
  84                 { NULL,            0,                 NULL, 0                 }
  85         };
  86
  87         int c;
  88
  89         assert(argc >= 0);
  90         assert(argv);
  91
  92         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
  93
  94                 switch (c) {
  95
  96                 case 'h':
  97                         help();
  98                         return 0;
  99
 100                 case ARG_ICON:
 101                         arg_icon = optarg;
 102                         break;
 103
 104                 case ARG_TIMEOUT:
 105                         if (parse_usec(optarg, &arg_timeout) < 0) {
 106                                 log_error("Failed to parse --timeout parameter %s", optarg);
 107                                 return -EINVAL;
 108                         }
 109                         break;
 110
 111                 case ARG_NO_TTY:
 112                         arg_use_tty = false;
 113                         break;
 114
 115                 case ARG_ACCEPT_CACHED:
 116                         arg_accept_cached = true;
 117                         break;
 118
 119                 case ARG_MULTIPLE:
 120                         arg_multiple = true;
 121                         break;
 122
 123                 case '?':
 124                         return -EINVAL;
 125
 126                 default:
 127                         log_error("Unknown option code %c", c);
 128                         return -EINVAL;
 129                 }
 130         }
 131
 132         if (optind != argc-1) {
 133                 help();
 134                 return -EINVAL;
 135         }
 136
 137         arg_message = argv[optind];
 138         return 1;
 139 }
 140
 141 int main(int argc, char *argv[]) {
 142         int r;
 143         usec_t timeout;
 144
 145         log_parse_environment();
 146         log_open();
 147
 148         if ((r = parse_argv(argc, argv)) <= 0)
 149                 goto finish;
 150
 151         if (arg_timeout > 0)
 152                 timeout = now(CLOCK_MONOTONIC) + arg_timeout;
 153         else
 154                 timeout = 0;
 155
 156         if (arg_use_tty && isatty(STDIN_FILENO)) {
 157                 char *password = NULL;
 158
 159                 if ((r = ask_password_tty(arg_message, timeout, NULL, &password)) >= 0) {
 160                         puts(password);
 161                         free(password);
 162                 }
 163
 164         } else {
 165                 char **l;
 166
 167                 if ((r = ask_password_agent(arg_message, arg_icon, timeout, arg_accept_cached, &l)) >= 0) {
 168                         char **p;
 169
 170                         STRV_FOREACH(p, l) {
 171                                 puts(*p);
 172
 173                                 if (!arg_multiple)
 174                                         break;
 175                         }
 176
 177                         strv_free(l);
 178                 }
 179         }
 180
 181 finish:
 182
 183         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 184 }