/mandos/release

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Viewing changes to plugins.d/password-prompt.c

  • Committer: Teddy Hogeborn
  • Date: 2009-05-17 00:50:09 UTC
  • Revision ID: teddy@fukt.bsnet.se-20090517005009-c0iptxampo6nf177
* initramfs-tools-hook-conf: Security bug fix: Add code to handle
                             being called by "mkinitramfs-kpkg"
                             instead of "update-initramfs".

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plugins.d/password-prompt.c
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/*  -*- coding: utf-8; mode: c; mode: orgtbl -*- */
 
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/*  -*- coding: utf-8 -*- */
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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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#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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                                   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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                                   ARGP_ERR_UNKNOWN */
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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){
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  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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    perror("sigaction");
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    return EXIT_FAILURE;
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  }
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  /* Need to check if the handler is SIG_IGN before handling:
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     | [[info:libc:Initial Signal Actions]] |
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     | [[info:libc:Basic Signal Handling]]  |
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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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      const char *cryptsource = getenv("cryptsource");
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      const char *crypttarget = getenv("crypttarget");
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      const char *const prompt
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        = "Enter passphrase to unlock the disk";
 
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        = "Enter passphrase to unlock the disk";      
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      if(cryptsource == NULL){
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        if(crypttarget == NULL){
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          fprintf(stderr, "%s: ", prompt);
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    /* if(ret == 0), then the only sensible thing to do is to retry to
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       read from stdin */
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    fputc('\n', stderr);
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    if(debug and not quit_now){
 
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    if(debug and quit_now == 0){
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      /* If quit_now is nonzero, we were interrupted by a signal, and
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         will print that later, so no need to show this too. */
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      fprintf(stderr, "getline() returned 0, retrying.\n");
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    perror("tcsetattr+echo");
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  }
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  if(quit_now){
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    sigemptyset(&old_action.sa_mask);
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    old_action.sa_handler = SIG_DFL;
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    ret = sigaction(signal_received, &old_action, NULL);
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    if(ret == -1){
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      perror("sigaction");
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    }
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    raise(signal_received);
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  }
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  if(debug){
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    fprintf(stderr, "%s is exiting with status %d\n", argv[0],
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            status);