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

  • Committer: Teddy Hogeborn
  • Date: 2024-09-11 22:44:07 UTC
  • Revision ID: teddy@recompile.se-20240911224407-vv54nya8wo9eedxx
Hide warnings if --no-warn-execstack is not supported

* Makefile: When testing if "-Xlinker --no-warn-execstack" can be
  used by the C compiler, hide any error output.

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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 © 2008-2017 Teddy Hogeborn
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 * Copyright © 2008-2017 Björn Påhlsson
 
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 * Copyright © 2008-2019, 2021-2022 Teddy Hogeborn
 
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 * Copyright © 2008-2019, 2021-2022 Björn Påhlsson
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 * 
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 * This file is part of Mandos.
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 * 
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 * Contact the authors at <mandos@recompile.se>.
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 */
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#define _GNU_SOURCE             /* getline(), asprintf() */
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28
 
#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 <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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#define _GNU_SOURCE             /* vasprintf(),
 
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                                   program_invocation_short_name,
 
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                                   asprintf(), getline() */
 
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#include <sys/types.h>          /* sig_atomic_t, pid_t */
 
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#include <stdbool.h>            /* bool, false, true */
 
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#include <argp.h>               /* argp_program_version,
 
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                                   argp_program_bug_address,
 
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                                   struct argp_option,
 
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                                   struct argp_state, argp_state_help,
 
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                                   ARGP_HELP_STD_HELP,
 
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                                   ARGP_HELP_EXIT_ERR,
 
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                                   ARGP_HELP_EXIT_OK, ARGP_HELP_USAGE,
 
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                                   argp_err_exit_status,
 
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                                   ARGP_ERR_UNKNOWN, argp_parse(),
 
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                                   ARGP_IN_ORDER, ARGP_NO_HELP */
 
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#include <stdarg.h>             /* va_list, va_start(), vfprintf() */
 
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#include <stdio.h>              /* vasprintf(), fprintf(), stderr,
 
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                                   vfprintf(), asprintf(), getline(),
 
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                                   stdin, feof(), clearerr(),
 
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                                   fputc() */
 
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#include <errno.h>              /* program_invocation_short_name,
 
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                                   errno, ENOENT, error_t, ENOMEM,
 
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                                   EINVAL, EBADF, ENOTTY, EFAULT,
 
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                                   EFBIG, EIO, ENOSPC, EINTR */
 
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#include <string.h>             /* strerror(), strrchr(), strcmp() */
 
51
#include <error.h>              /* error() */
 
52
#include <stdlib.h>             /* free(), realloc(), EXIT_SUCCESS,
 
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                                   EXIT_FAILURE, getenv() */
 
54
#include <unistd.h>             /* access(), R_OK, ssize_t, close(),
 
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                                   read(), STDIN_FILENO, write(),
 
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                                   STDOUT_FILENO */
 
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#include <dirent.h>             /* struct dirent, scandir(),
 
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                                   alphasort() */
 
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#include <inttypes.h>           /* uintmax_t, strtoumax() */
 
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#include <iso646.h>             /* or, and, not */
 
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#include <fcntl.h>              /* open(), O_RDONLY */
 
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#include <stddef.h>             /* NULL, size_t */
 
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#include <termios.h>            /* struct termios, tcgetattr(),
 
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                                   tcflag_t, ECHO, tcsetattr(),
 
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                                   TCSAFLUSH */
 
66
#include <signal.h>             /* struct sigaction, sigemptyset(),
 
67
                                   sigaddset(), SIGINT, SIGHUP,
 
68
                                   SIGTERM, SIG_IGN, SIG_DFL,
37
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                                   raise() */
38
 
#include <stddef.h>             /* NULL, size_t, ssize_t */
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#include <sys/types.h>          /* ssize_t, struct dirent, pid_t,
40
 
                                   ssize_t, open() */
41
 
#include <stdlib.h>             /* EXIT_SUCCESS, EXIT_FAILURE,
42
 
                                   getenv(), free() */
43
 
#include <dirent.h>             /* scandir(), alphasort() */
44
 
#include <stdio.h>              /* fprintf(), stderr, getline(),
45
 
                                   stdin, feof(), fputc(), vfprintf(),
46
 
                                   vasprintf() */
47
 
#include <errno.h>              /* errno, EBADF, ENOTTY, EINVAL,
48
 
                                   EFAULT, EFBIG, EIO, ENOSPC, EINTR
49
 
                                */
50
 
#include <error.h>              /* error() */
51
 
#include <iso646.h>             /* or, not */
52
 
#include <stdbool.h>            /* bool, false, true */
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#include <inttypes.h>           /* strtoumax() */
54
 
#include <sys/stat.h>           /* struct stat, lstat(), open() */
55
 
#include <string.h>             /* strlen, rindex, memcmp, strerror()
56
 
                                 */
57
 
#include <argp.h>               /* struct argp_option, struct
58
 
                                   argp_state, struct argp,
59
 
                                   argp_parse(), error_t,
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                                   ARGP_KEY_ARG, ARGP_KEY_END,
61
 
                                   ARGP_ERR_UNKNOWN */
62
 
#include <sysexits.h>           /* EX_SOFTWARE, EX_OSERR,
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                                   EX_UNAVAILABLE, EX_IOERR, EX_OK */
64
 
#include <fcntl.h>              /* open() */
65
 
#include <stdarg.h>             /* va_list, va_start(), ... */
 
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#include <sysexits.h>           /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
 
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                                   EX_IOERR, EX_OSFILE, EX_OK */
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volatile sig_atomic_t quit_now = 0;
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int signal_received;
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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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  if(access("/run/plymouth/pid", R_OK) == 0){
 
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    return true;
 
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  }
 
122
  
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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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  struct termios t_new, t_old;
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  char *buffer = NULL;
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  char *prefix = NULL;
 
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  char *prompt = NULL;
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  int status = EXIT_SUCCESS;
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  struct sigaction old_action,
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    new_action = { .sa_handler = termination_handler,
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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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      /*
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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 'p':
 
278
      case 'p':                 /* --prefix */
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        prefix = arg;
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        break;
267
 
      case 128:
 
281
      case 128:                 /* --debug */
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        debug = true;
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        break;
 
284
      case 129:                 /* --prompt */
 
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        prompt = arg;
 
286
        break;
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        /*
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         * These reproduce what we would get without ARGP_NO_HELP
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         */
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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);
 
294
        __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);
 
298
        __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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    if(prefix){
426
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      fprintf(stderr, "%s ", prefix);
427
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    }
428
 
    {
 
447
    if(prompt != NULL){
 
448
      fprintf(stderr, "%s: ", prompt);
 
449
    } else {
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      const char *cryptsource = getenv("CRYPTTAB_SOURCE");
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      const char *crypttarget = getenv("CRYPTTAB_NAME");
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      /* Before cryptsetup 1.1.0~rc2 */
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    }
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    if(sret < 0){
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      int e = errno;
509
 
      if(errno != EINTR and not feof(stdin)){
510
 
        error_plus(0, errno, "getline");
511
 
        switch(e){
512
 
        case EBADF:
513
 
          status = EX_UNAVAILABLE;
514
 
          break;
515
 
        case EIO:
516
 
        case EINVAL:
517
 
        default:
518
 
          status = EX_IOERR;
519
 
          break;
 
530
      if(errno != EINTR){
 
531
        if(not feof(stdin)){
 
532
          error_plus(0, errno, "getline");
 
533
          switch(e){
 
534
          case EBADF:
 
535
            status = EX_UNAVAILABLE;
 
536
            break;
 
537
          case EIO:
 
538
          case EINVAL:
 
539
          default:
 
540
            status = EX_IOERR;
 
541
            break;
 
542
          }
 
543
          break;
 
544
        } else {
 
545
          clearerr(stdin);
520
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        }
521
 
        break;
522
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      }
523
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    }
524
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    /* if(sret == 0), then the only sensible thing to do is to retry