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- Committer: teddy at bsnet
- Date: 2010-09-09 18:16:14 UTC
- mfrom: (237.2.35 mandos-empty-device)
- Revision ID: teddy@fukt.bsnet.se-20100909181614-oanlmvkzsiodbo3c
Merge in branch to interpret an empty device name to mean
"autodetect".
"autodetect".
- files removed:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
added
removed
plugins.d/password-prompt.c
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/*
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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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* Contact the authors at <mandos@fukt.bsnet.se>.
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*/
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#define _GNU_SOURCE /* getline(), asprintf() */
25
#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(), 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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#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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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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/* 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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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, ": ");
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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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static void termination_handler(int signum){
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if(quit_now){
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return;
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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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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 maxvalue;
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char *tmp;
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errno = 0;
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maxvalue = 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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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(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(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(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(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(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(1, errno, "scandir");
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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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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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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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perror("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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if(debug){
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fprintf(stderr, "Starting %s\n", argv[0]);
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}
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if (conflict_detection()){
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if(debug){
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fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
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}
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return EXIT_FAILURE;
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}
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if(debug){
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fprintf(stderr, "Storing current terminal attributes\n");
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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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perror("tcgetattr");
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switch(e){
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case EBADF:
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case ENOTTY:
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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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perror("sigaddset");
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return EX_OSERR;
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173
}
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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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perror("sigaddset");
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return EX_OSERR;
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}
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ret = sigaddset(&new_action.sa_mask, SIGTERM);
339
180
if(ret == -1){
340
error(0, errno, "sigaddset");
181
perror("sigaddset");
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return EX_OSERR;
342
183
}
343
184
/* Need to check if the handler is SIG_IGN before handling:
346
187
*/
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ret = sigaction(SIGINT, NULL, &old_action);
348
189
if(ret == -1){
349
error(0, errno, "sigaction");
190
perror("sigaction");
350
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return EX_OSERR;
351
192
}
352
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if(old_action.sa_handler != SIG_IGN){
353
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ret = sigaction(SIGINT, &new_action, NULL);
354
195
if(ret == -1){
355
error(0, errno, "sigaction");
196
perror("sigaction");
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return EX_OSERR;
357
198
}
358
199
}
359
200
ret = sigaction(SIGHUP, NULL, &old_action);
360
201
if(ret == -1){
361
error(0, errno, "sigaction");
202
perror("sigaction");
362
203
return EX_OSERR;
363
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}
364
205
if(old_action.sa_handler != SIG_IGN){
365
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ret = sigaction(SIGHUP, &new_action, NULL);
366
207
if(ret == -1){
367
error(0, errno, "sigaction");
208
perror("sigaction");
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209
return EX_OSERR;
369
210
}
370
211
}
371
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ret = sigaction(SIGTERM, NULL, &old_action);
372
213
if(ret == -1){
373
error(0, errno, "sigaction");
214
perror("sigaction");
374
215
return EX_OSERR;
375
216
}
376
217
if(old_action.sa_handler != SIG_IGN){
377
218
ret = sigaction(SIGTERM, &new_action, NULL);
378
219
if(ret == -1){
379
error(0, errno, "sigaction");
220
perror("sigaction");
380
221
return EX_OSERR;
381
222
}
382
223
}
390
231
t_new.c_lflag &= ~(tcflag_t)ECHO;
391
232
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
392
233
int e = errno;
393
error(0, errno, "tcsetattr-echo");
234
perror("tcsetattr-echo");
394
235
switch(e){
395
236
case EBADF:
396
237
case ENOTTY:
445
286
}
446
287
}
447
288
}
448
sret = getline(&buffer, &n, stdin);
449
if(sret > 0){
289
ret = getline(&buffer, &n, stdin);
290
if(ret > 0){
450
291
status = EXIT_SUCCESS;
451
292
/* Make n = data size instead of allocated buffer size */
452
n = (size_t)sret;
293
n = (size_t)ret;
453
294
/* Strip final newline */
454
295
if(n > 0 and buffer[n-1] == '\n'){
455
296
buffer[n-1] = '\0'; /* not strictly necessary */
457
298
}
458
299
size_t written = 0;
459
300
while(written < n){
460
sret = write(STDOUT_FILENO, buffer + written, n - written);
461
if(sret < 0){
301
ret = write(STDOUT_FILENO, buffer + written, n - written);
302
if(ret < 0){
462
303
int e = errno;
463
error(0, errno, "write");
304
perror("write");
464
305
switch(e){
465
306
case EBADF:
466
307
case EFAULT:
477
318
}
478
319
break;
479
320
}
480
written += (size_t)sret;
321
written += (size_t)ret;
481
322
}
482
sret = close(STDOUT_FILENO);
483
if(sret == -1){
323
ret = close(STDOUT_FILENO);
324
if(ret == -1){
484
325
int e = errno;
485
error(0, errno, "close");
326
perror("close");
486
327
switch(e){
487
328
case EBADF:
488
329
status = EX_OSFILE;
495
336
}
496
337
break;
497
338
}
498
if(sret < 0){
339
if(ret < 0){
499
340
int e = errno;
500
341
if(errno != EINTR and not feof(stdin)){
501
error(0, errno, "getline");
342
perror("getline");
502
343
switch(e){
503
344
case EBADF:
504
345
status = EX_UNAVAILABLE;
511
352
break;
512
353
}
513
354
}
514
/* if(sret == 0), then the only sensible thing to do is to retry
515
to read from stdin */
355
/* if(ret == 0), then the only sensible thing to do is to retry to
356
read from stdin */
516
357
fputc('\n', stderr);
517
358
if(debug and not quit_now){
518
359
/* If quit_now is nonzero, we were interrupted by a signal, and
527
368
fprintf(stderr, "Restoring terminal attributes\n");
528
369
}
529
370
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
530
error(0, errno, "tcsetattr+echo");
371
perror("tcsetattr+echo");
531
372
}
532
373
533
374
if(quit_now){
535
376
old_action.sa_handler = SIG_DFL;
536
377
ret = sigaction(signal_received, &old_action, NULL);
537
378
if(ret == -1){
538
error(0, errno, "sigaction");
379
perror("sigaction");
539
380
}
540
381
raise(signal_received);
541
382
}
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