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* Password-prompt - Read a password from the terminal and print it
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* Copyright © 2008-2010 Teddy Hogeborn
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* Copyright © 2008-2010 Björn Påhlsson
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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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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful, but
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* Copyright © 2008-2019 Teddy Hogeborn
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* Copyright © 2008-2019 Björn Påhlsson
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* This file is part of Mandos.
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* Mandos is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* Mandos is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
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* Contact the authors at <mandos@fukt.bsnet.se>.
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* Contact the authors at <mandos@recompile.se>.
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#define _GNU_SOURCE /* getline(), asprintf() */
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#include <termios.h> /* struct termios, tcsetattr(),
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TCSAFLUSH, tcgetattr(), ECHO */
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#include <unistd.h> /* struct termios, tcsetattr(),
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STDIN_FILENO, TCSAFLUSH,
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tcgetattr(), ECHO, readlink() */
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#include <unistd.h> /* access(), struct termios,
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tcsetattr(), STDIN_FILENO,
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TCSAFLUSH, tcgetattr(), ECHO,
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#include <signal.h> /* sig_atomic_t, raise(), struct
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sigaction, sigemptyset(),
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sigaction(), sigaddset(), SIGINT,
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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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const char *argp_program_bug_address = "<mandos@recompile.se>";
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/* Needed for conflict resolution */
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const char plymouth_name[] = "plymouthd";
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/* Function to use when printing errors */
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__attribute__((format (gnu_printf, 3, 4)))
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void error_plus(int status, int errnum, const char *formatstring,
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va_start(ap, formatstring);
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ret = vasprintf(&text, formatstring, ap);
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fprintf(stderr, "Mandos plugin %s: ",
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program_invocation_short_name);
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vfprintf(stderr, formatstring, ap);
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fprintf(stderr, ": ");
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fprintf(stderr, "%s\n", strerror(errnum));
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fprintf(stderr, ": %s\n", strerror(errnum));
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error(status, errno, "vasprintf while printing error");
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from the terminal. Password-prompt will exit if it detects
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plymouth since plymouth performs the same functionality.
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if(access("/run/plymouth/pid", R_OK) == 0){
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__attribute__((nonnull))
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int is_plymouth(const struct dirent *proc_entry){
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maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
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proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
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if(errno != 0 or *tmp != '\0'
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or maxvalue != (uintmax_t)((pid_t)maxvalue)){
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or proc_id != (uintmax_t)((pid_t)proc_id)){
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struct dirent **direntries = NULL;
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ret = scandir("/proc", &direntries, is_plymouth, alphasort);
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error(1, errno, "scandir");
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error_plus(1, errno, "scandir");
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free(direntries);
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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 = "prompt", .key = 129,
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.arg = "PROMPT", .flags = 0,
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.doc = "The prompt to show", .group = 2 },
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{ .name = "debug", .key = 128,
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.doc = "Debug mode", .group = 3 },
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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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__builtin_unreachable();
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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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__builtin_unreachable();
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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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sigemptyset(&new_action.sa_mask);
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ret = sigaddset(&new_action.sa_mask, SIGINT);
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error(0, errno, "sigaddset");
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error_plus(0, errno, "sigaddset");
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ret = sigaddset(&new_action.sa_mask, SIGHUP);
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error(0, errno, "sigaddset");
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error_plus(0, errno, "sigaddset");
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ret = sigaddset(&new_action.sa_mask, SIGTERM);
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error(0, errno, "sigaddset");
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error_plus(0, errno, "sigaddset");
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/* Need to check if the handler is SIG_IGN before handling:
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ret = sigaction(SIGINT, NULL, &old_action);
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error(0, errno, "sigaction");
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error_plus(0, errno, "sigaction");
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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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error(0, errno, "sigaction");
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error_plus(0, errno, "sigaction");
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ret = sigaction(SIGHUP, NULL, &old_action);
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error(0, errno, "sigaction");
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error_plus(0, errno, "sigaction");
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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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error(0, errno, "sigaction");
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error_plus(0, errno, "sigaction");
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ret = sigaction(SIGTERM, NULL, &old_action);
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error(0, errno, "sigaction");
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error_plus(0, errno, "sigaction");
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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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error(0, errno, "sigaction");
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error_plus(0, errno, "sigaction");
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fprintf(stderr, "Restoring terminal attributes\n");
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if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
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error(0, errno, "tcsetattr+echo");
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error_plus(0, errno, "tcsetattr+echo");
added
removed
plugins.d/password-prompt.c
