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237.7.5
(compared to revision 237.7.456)
: plugins.d/password-prompt.c
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- Committer: Teddy Hogeborn
- Date: 2010-10-07 19:01:52 UTC
- mfrom: (279 mandos-release)
- mto: (237.12.2 mandos-persistent) (24.1.171 mandos) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 280.
- Revision ID: teddy@fukt.bsnet.se-20101007190152-8cfnfyriyrnzo7kq
Merge from release branch.
- files removed:
- bugs.xml
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/password-prompt.c
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2
/*
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3
* Password-prompt - Read a password from the terminal and print it
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*
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* Copyright © 2008-2017 Teddy Hogeborn
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* Copyright © 2008-2017 Björn Påhlsson
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*
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* This file is part of Mandos.
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*
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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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*
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* Mandos is distributed in the hope that it will be useful, but
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* Copyright © 2008-2010 Teddy Hogeborn
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* Copyright © 2008-2010 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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* 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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*
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* This program 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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15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
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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@recompile.se>.
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* Contact the authors at <mandos@fukt.bsnet.se>.
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*/
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#define _GNU_SOURCE /* getline(), asprintf() */
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#define _GNU_SOURCE /* getline() */
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#include <termios.h> /* struct termios, tcsetattr(),
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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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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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SIGQUIT, SIGHUP, SIGTERM,
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raise() */
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#include <stddef.h> /* NULL, size_t, ssize_t */
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#include <sys/types.h> /* ssize_t, struct dirent, pid_t,
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ssize_t, open() */
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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(), free() */
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#include <dirent.h> /* scandir(), alphasort() */
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getenv() */
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#include <stdio.h> /* fprintf(), stderr, getline(),
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stdin, feof(), fputc(), vfprintf(),
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vasprintf() */
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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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#include <iso646.h> /* or, not */
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#include <stdbool.h> /* bool, false, true */
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#include <inttypes.h> /* strtoumax() */
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#include <sys/stat.h> /* struct stat, lstat(), open() */
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#include <string.h> /* strlen, rindex, memcmp, strerror()
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*/
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#include <string.h> /* strlen, rindex */
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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_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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#include <fcntl.h> /* open() */
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#include <stdarg.h> /* va_list, va_start(), ... */
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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@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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...){
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va_list ap;
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char *text;
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int ret;
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va_start(ap, formatstring);
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ret = vasprintf(&text, formatstring, ap);
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if(ret == -1){
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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, ": %s\n", strerror(errnum));
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error(status, errno, "vasprintf while printing error");
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return;
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}
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fprintf(stderr, "Mandos plugin ");
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error(status, errnum, "%s", text);
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free(text);
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}
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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static void termination_handler(int signum){
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if(quit_now){
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signal_received = signum;
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}
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bool conflict_detection(void){
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/* plymouth conflicts with password-prompt since both want to read
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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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*/
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__attribute__((nonnull))
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int is_plymouth(const struct dirent *proc_entry){
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int ret;
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int cl_fd;
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{
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uintmax_t proc_id;
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char *tmp;
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errno = 0;
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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 proc_id != (uintmax_t)((pid_t)proc_id)){
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return 0;
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}
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}
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char *cmdline_filename;
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ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
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proc_entry->d_name);
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if(ret == -1){
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error_plus(0, errno, "asprintf");
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return 0;
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}
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/* Open /proc/<pid>/cmdline */
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cl_fd = open(cmdline_filename, O_RDONLY);
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free(cmdline_filename);
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if(cl_fd == -1){
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if(errno != ENOENT){
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error_plus(0, errno, "open");
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}
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return 0;
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}
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char *cmdline = NULL;
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{
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size_t cmdline_len = 0;
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size_t cmdline_allocated = 0;
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char *tmp;
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const size_t blocksize = 1024;
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ssize_t sret;
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do {
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/* Allocate more space? */
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if(cmdline_len + blocksize + 1 > cmdline_allocated){
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tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
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if(tmp == NULL){
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error_plus(0, errno, "realloc");
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free(cmdline);
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close(cl_fd);
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return 0;
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}
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cmdline = tmp;
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cmdline_allocated += blocksize;
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}
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/* Read data */
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sret = read(cl_fd, cmdline + cmdline_len,
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cmdline_allocated - cmdline_len);
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if(sret == -1){
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error_plus(0, errno, "read");
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free(cmdline);
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close(cl_fd);
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return 0;
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}
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cmdline_len += (size_t)sret;
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} while(sret != 0);
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ret = close(cl_fd);
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if(ret == -1){
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error_plus(0, errno, "close");
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free(cmdline);
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return 0;
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}
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cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
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}
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/* we now have cmdline */
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/* get basename */
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char *cmdline_base = strrchr(cmdline, '/');
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if(cmdline_base != NULL){
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cmdline_base += 1; /* skip the slash */
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} else {
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cmdline_base = cmdline;
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}
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if(strcmp(cmdline_base, plymouth_name) != 0){
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if(debug){
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fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
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plymouth_name);
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}
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free(cmdline);
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return 0;
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}
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if(debug){
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fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
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plymouth_name);
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}
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free(cmdline);
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return 1;
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}
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struct dirent **direntries = NULL;
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int ret;
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ret = scandir("/proc", &direntries, is_plymouth, alphasort);
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if(ret == -1){
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error_plus(1, errno, "scandir");
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}
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{
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int i = ret;
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while(i--){
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free(direntries[i]);
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}
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}
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free(direntries);
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return ret > 0;
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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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{ .name = NULL }
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};
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__attribute__((nonnull(3)))
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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 ENOMEM:
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default:
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errno = ret;
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error_plus(0, errno, "argp_parse");
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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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151
if(debug){
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fprintf(stderr, "Starting %s\n", argv[0]);
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153
}
312
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if(conflict_detection()){
314
if(debug){
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fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
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}
317
return EXIT_FAILURE;
318
}
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320
154
if(debug){
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fprintf(stderr, "Storing current terminal attributes\n");
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}
323
157
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if(tcgetattr(STDIN_FILENO, &t_old) != 0){
325
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int e = errno;
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error_plus(0, errno, "tcgetattr");
160
error(0, errno, "tcgetattr");
327
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switch(e){
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case EBADF:
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case ENOTTY:
336
170
sigemptyset(&new_action.sa_mask);
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ret = sigaddset(&new_action.sa_mask, SIGINT);
338
172
if(ret == -1){
339
error_plus(0, errno, "sigaddset");
173
error(0, errno, "sigaddset");
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return EX_OSERR;
341
175
}
342
176
ret = sigaddset(&new_action.sa_mask, SIGHUP);
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177
if(ret == -1){
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error_plus(0, errno, "sigaddset");
178
error(0, errno, "sigaddset");
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return EX_OSERR;
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180
}
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ret = sigaddset(&new_action.sa_mask, SIGTERM);
348
182
if(ret == -1){
349
error_plus(0, errno, "sigaddset");
183
error(0, errno, "sigaddset");
350
184
return EX_OSERR;
351
185
}
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186
/* Need to check if the handler is SIG_IGN before handling:
355
189
*/
356
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ret = sigaction(SIGINT, NULL, &old_action);
357
191
if(ret == -1){
358
error_plus(0, errno, "sigaction");
192
error(0, errno, "sigaction");
359
193
return EX_OSERR;
360
194
}
361
195
if(old_action.sa_handler != SIG_IGN){
362
196
ret = sigaction(SIGINT, &new_action, NULL);
363
197
if(ret == -1){
364
error_plus(0, errno, "sigaction");
198
error(0, errno, "sigaction");
365
199
return EX_OSERR;
366
200
}
367
201
}
368
202
ret = sigaction(SIGHUP, NULL, &old_action);
369
203
if(ret == -1){
370
error_plus(0, errno, "sigaction");
204
error(0, errno, "sigaction");
371
205
return EX_OSERR;
372
206
}
373
207
if(old_action.sa_handler != SIG_IGN){
374
208
ret = sigaction(SIGHUP, &new_action, NULL);
375
209
if(ret == -1){
376
error_plus(0, errno, "sigaction");
210
error(0, errno, "sigaction");
377
211
return EX_OSERR;
378
212
}
379
213
}
380
214
ret = sigaction(SIGTERM, NULL, &old_action);
381
215
if(ret == -1){
382
error_plus(0, errno, "sigaction");
216
error(0, errno, "sigaction");
383
217
return EX_OSERR;
384
218
}
385
219
if(old_action.sa_handler != SIG_IGN){
386
220
ret = sigaction(SIGTERM, &new_action, NULL);
387
221
if(ret == -1){
388
error_plus(0, errno, "sigaction");
222
error(0, errno, "sigaction");
389
223
return EX_OSERR;
390
224
}
391
225
}
399
233
t_new.c_lflag &= ~(tcflag_t)ECHO;
400
234
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
401
235
int e = errno;
402
error_plus(0, errno, "tcsetattr-echo");
236
error(0, errno, "tcsetattr-echo");
403
237
switch(e){
404
238
case EBADF:
405
239
case ENOTTY:
469
303
sret = write(STDOUT_FILENO, buffer + written, n - written);
470
304
if(sret < 0){
471
305
int e = errno;
472
error_plus(0, errno, "write");
306
error(0, errno, "write");
473
307
switch(e){
474
308
case EBADF:
475
309
case EFAULT:
491
325
sret = close(STDOUT_FILENO);
492
326
if(sret == -1){
493
327
int e = errno;
494
error_plus(0, errno, "close");
328
error(0, errno, "close");
495
329
switch(e){
496
330
case EBADF:
497
331
status = EX_OSFILE;
507
341
if(sret < 0){
508
342
int e = errno;
509
343
if(errno != EINTR and not feof(stdin)){
510
error_plus(0, errno, "getline");
344
error(0, errno, "getline");
511
345
switch(e){
512
346
case EBADF:
513
347
status = EX_UNAVAILABLE;
514
break;
515
348
case EIO:
516
349
case EINVAL:
517
350
default:
521
354
break;
522
355
}
523
356
}
524
/* if(sret == 0), then the only sensible thing to do is to retry
525
to read from stdin */
357
/* if(sret == 0), then the only sensible thing to do is to retry to
358
read from stdin */
526
359
fputc('\n', stderr);
527
360
if(debug and not quit_now){
528
361
/* If quit_now is nonzero, we were interrupted by a signal, and
537
370
fprintf(stderr, "Restoring terminal attributes\n");
538
371
}
539
372
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
540
error_plus(0, errno, "tcsetattr+echo");
373
error(0, errno, "tcsetattr+echo");
541
374
}
542
375
543
376
if(quit_now){
545
378
old_action.sa_handler = SIG_DFL;
546
379
ret = sigaction(signal_received, &old_action, NULL);
547
380
if(ret == -1){
548
error_plus(0, errno, "sigaction");
381
error(0, errno, "sigaction");
549
382
}
550
383
raise(signal_received);
551
384
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0