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  • Committer: Teddy Hogeborn
  • Date: 2019-07-18 00:02:43 UTC
  • Revision ID: teddy@recompile.se-20190718000243-okz4s9xao1r1tfnx
Document bug in mandos-keygen which strips white space from passwords

Passwords, as read by mandos-keygen when given the --password or -p
options, are stripped of white space from the start and from the end
of the password.  This is because mandos-keygen is a shell script, and
the Bourne Shell "read" builtin does not seem to have a way to avoid
this.  Document this bug.

* manods-keygen.xml (OPTIONS): Document the white space-stripping
                               nature of the --password/-p option, and
                               also note in the description of
                               --passfile and -F that they avoid this
                               behavior.
  (BUGS): Again mention the problem with the --password and -p
          options, and suggest --passfile as a possible workaround.

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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 © 2008-2019, 2021 Teddy Hogeborn
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 * Copyright © 2008-2019, 2021 Björn Påhlsson
 
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 * Copyright © 2008-2019 Teddy Hogeborn
 
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 * Copyright © 2008-2019 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             /* 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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#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 <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 <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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#include <stdio.h>              /* fprintf(), stderr, getline(),
 
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                                   stdin, feof(), fputc(), vfprintf(),
 
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                                   vasprintf() */
 
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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 <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() */
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#include <error.h>              /* error() */
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#include <stdlib.h>             /* free(), realloc(), EXIT_SUCCESS,
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                                   EXIT_FAILURE, getenv() */
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#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 */
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#include <signal.h>             /* struct sigaction, sigemptyset(),
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                                   sigaddset(), SIGINT, SIGHUP,
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                                   SIGTERM, SIG_IGN, SIG_DFL,
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                                   raise() */
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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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#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 <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_KEY_ARG, ARGP_KEY_END,
 
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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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     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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  }
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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':                 /* --prefix */
 
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      case 'p':
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        prefix = arg;
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        break;
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      case 128:                 /* --debug */
 
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      case 128:
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        debug = true;
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        break;
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      case 129:                 /* --prompt */
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        prompt = arg;
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        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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    if(prefix){
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      fprintf(stderr, "%s ", prefix);
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    }
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    if(prompt != NULL){
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      fprintf(stderr, "%s: ", prompt);
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    } else {
 
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    {
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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 */