LCOV - code coverage report
Current view: top level - g10 - openfile.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 54 212 25.5 %
Date: 2016-09-12 13:01:59 Functions: 5 9 55.6 %

          Line data    Source code
       1             : /* openfile.c
       2             :  * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2009,
       3             :  *               2010 Free Software Foundation, Inc.
       4             :  *
       5             :  * This file is part of GnuPG.
       6             :  *
       7             :  * GnuPG is free software; you can redistribute it and/or modify
       8             :  * it under the terms of the GNU General Public License as published by
       9             :  * the Free Software Foundation; either version 3 of the License, or
      10             :  * (at your option) any later version.
      11             :  *
      12             :  * GnuPG is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      15             :  * GNU General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU General Public License
      18             :  * along with this program; if not, see <http://www.gnu.org/licenses/>.
      19             :  */
      20             : 
      21             : #include <config.h>
      22             : #include <stdio.h>
      23             : #include <stdlib.h>
      24             : #include <string.h>
      25             : #include <errno.h>
      26             : #include <sys/types.h>
      27             : #include <sys/stat.h>
      28             : #include <fcntl.h>
      29             : #include <unistd.h>
      30             : 
      31             : #include "gpg.h"
      32             : #include "util.h"
      33             : #include "ttyio.h"
      34             : #include "options.h"
      35             : #include "main.h"
      36             : #include "status.h"
      37             : #include "i18n.h"
      38             : 
      39             : #ifdef USE_ONLY_8DOT3
      40             : #define SKELEXT ".skl"
      41             : #else
      42             : #define SKELEXT EXTSEP_S "skel"
      43             : #endif
      44             : 
      45             : #ifdef HAVE_W32_SYSTEM
      46             : #define NAME_OF_DEV_NULL "nul"
      47             : #else
      48             : #define NAME_OF_DEV_NULL "/dev/null"
      49             : #endif
      50             : 
      51             : 
      52             : #if defined (HAVE_DRIVE_LETTERS) || defined (__riscos__)
      53             : #define CMP_FILENAME(a,b) ascii_strcasecmp( (a), (b) )
      54             : #else
      55             : #define CMP_FILENAME(a,b) strcmp( (a), (b) )
      56             : #endif
      57             : 
      58             : 
      59             : /* FIXME:  Implement opt.interactive. */
      60             : 
      61             : /*
      62             :  * Check whether FNAME exists and ask if it's okay to overwrite an
      63             :  * existing one.
      64             :  * Returns: True: it's okay to overwrite or the file does not exist
      65             :  *          False: Do not overwrite
      66             :  */
      67             : int
      68        1086 : overwrite_filep( const char *fname )
      69             : {
      70        1086 :   if ( iobuf_is_pipe_filename (fname) )
      71          39 :     return 1; /* Writing to stdout is always okay.  */
      72             : 
      73        1047 :   if ( access( fname, F_OK ) )
      74        1047 :     return 1; /* Does not exist.  */
      75             : 
      76           0 :   if ( !compare_filenames (fname, NAME_OF_DEV_NULL) )
      77           0 :     return 1; /* Does not do any harm.  */
      78             : 
      79           0 :   if (opt.answer_yes)
      80           0 :     return 1;
      81           0 :   if (opt.answer_no || opt.batch)
      82           0 :     return 0;  /* Do not overwrite.  */
      83             : 
      84           0 :   tty_printf (_("File '%s' exists. "), fname);
      85           0 :   if (cpr_enabled ())
      86           0 :     tty_printf ("\n");
      87           0 :   if (cpr_get_answer_is_yes ("openfile.overwrite.okay",
      88           0 :                              _("Overwrite? (y/N) ")) )
      89           0 :     return 1;
      90           0 :   return 0;
      91             : }
      92             : 
      93             : 
      94             : /*
      95             :  * Strip known extensions from iname and return a newly allocated
      96             :  * filename.  Return NULL if we can't do that.
      97             :  */
      98             : char *
      99           0 : make_outfile_name (const char *iname)
     100             : {
     101             :   size_t n;
     102             : 
     103           0 :   if (iobuf_is_pipe_filename (iname))
     104           0 :     return xstrdup ("-");
     105             : 
     106           0 :   n = strlen (iname);
     107           0 :   if (n > 4 && (!CMP_FILENAME(iname+n-4, EXTSEP_S GPGEXT_GPG)
     108           0 :                 || !CMP_FILENAME(iname+n-4, EXTSEP_S "pgp")
     109           0 :                 || !CMP_FILENAME(iname+n-4, EXTSEP_S "sig")
     110           0 :                 || !CMP_FILENAME(iname+n-4, EXTSEP_S "asc")))
     111             :     {
     112           0 :       char *buf = xstrdup (iname);
     113           0 :       buf[n-4] = 0;
     114           0 :       return buf;
     115             :     }
     116           0 :   else if (n > 5 && !CMP_FILENAME(iname+n-5, EXTSEP_S "sign"))
     117             :     {
     118           0 :       char *buf = xstrdup (iname);
     119           0 :       buf[n-5] = 0;
     120           0 :       return buf;
     121             :     }
     122             : 
     123           0 :   log_info (_("%s: unknown suffix\n"), iname);
     124           0 :   return NULL;
     125             : }
     126             : 
     127             : 
     128             : /* Ask for an output filename; use the given one as default.  Return
     129             :    NULL if no file has been given or if it is not possible to ask the
     130             :    user.  NAME is the template len which might conatin enbedded Nuls.
     131             :    NAMELEN is its actual length.
     132             :  */
     133             : char *
     134           0 : ask_outfile_name( const char *name, size_t namelen )
     135             : {
     136             :   size_t n;
     137             :   const char *s;
     138             :   char *prompt;
     139             :   char *fname;
     140             :   char *defname;
     141             : 
     142           0 :   if ( opt.batch )
     143           0 :     return NULL;
     144             : 
     145           0 :   defname = name && namelen? make_printable_string (name, namelen, 0) : NULL;
     146             : 
     147           0 :   s = _("Enter new filename");
     148           0 :   n = strlen(s) + (defname?strlen (defname):0) + 10;
     149           0 :   prompt = xmalloc (n);
     150           0 :   if (defname)
     151           0 :     snprintf (prompt, n-1, "%s [%s]: ", s, defname );
     152             :   else
     153           0 :     snprintf (prompt, n-1, "%s: ", s );
     154           0 :   tty_enable_completion(NULL);
     155           0 :   fname = cpr_get ("openfile.askoutname", prompt );
     156           0 :   cpr_kill_prompt ();
     157           0 :   tty_disable_completion ();
     158           0 :   xfree (prompt);
     159           0 :   if ( !*fname )
     160             :     {
     161           0 :       xfree (fname);
     162           0 :       fname = defname;
     163           0 :       defname = NULL;
     164             :     }
     165           0 :   xfree (defname);
     166           0 :   if (fname)
     167           0 :     trim_spaces (fname);
     168           0 :   return fname;
     169             : }
     170             : 
     171             : 
     172             : /*
     173             :  * Make an output filename for the inputfile INAME.
     174             :  * Returns an IOBUF and an errorcode
     175             :  * Mode 0 = use ".gpg"
     176             :  *      1 = use ".asc"
     177             :  *      2 = use ".sig"
     178             :  *      3 = use ".rev"
     179             :  *
     180             :  * If INP_FD is not -1 the function simply creates an IOBUF for that
     181             :  * file descriptor and ignore INAME and MODE.  Note that INP_FD won't
     182             :  * be closed if the returned IOBUF is closed.  With RESTRICTEDPERM a
     183             :  * file will be created with mode 700 if possible.
     184             :  */
     185             : int
     186         608 : open_outfile (int inp_fd, const char *iname, int mode, int restrictedperm,
     187             :               iobuf_t *a)
     188             : {
     189         608 :   int rc = 0;
     190             : 
     191         608 :   *a = NULL;
     192         608 :   if (inp_fd != -1)
     193             :     {
     194             :       char xname[64];
     195             : 
     196           0 :       *a = iobuf_fdopen_nc (inp_fd, "wb");
     197           0 :       if (!*a)
     198             :         {
     199           0 :           rc = gpg_error_from_syserror ();
     200           0 :           snprintf (xname, sizeof xname, "[fd %d]", inp_fd);
     201           0 :           log_error (_("can't open '%s': %s\n"), xname, gpg_strerror (rc));
     202             :         }
     203           0 :       else if (opt.verbose)
     204             :         {
     205           0 :           snprintf (xname, sizeof xname, "[fd %d]", inp_fd);
     206           0 :           log_info (_("writing to '%s'\n"), xname);
     207             :         }
     208             :     }
     209         608 :   else if (iobuf_is_pipe_filename (iname) && !opt.outfile)
     210             :     {
     211          42 :       *a = iobuf_create (NULL, 0);
     212          84 :       if ( !*a )
     213             :         {
     214           0 :           rc = gpg_error_from_syserror ();
     215           0 :           log_error (_("can't open '%s': %s\n"), "[stdout]", strerror(errno) );
     216             :         }
     217          42 :       else if ( opt.verbose )
     218           0 :         log_info (_("writing to stdout\n"));
     219             :     }
     220             :   else
     221             :     {
     222         566 :       char *buf = NULL;
     223             :       const char *name;
     224             : 
     225         566 :       if (opt.dry_run)
     226           0 :         name = NAME_OF_DEV_NULL;
     227         566 :       else if (opt.outfile)
     228         564 :         name = opt.outfile;
     229             :       else
     230             :         {
     231             : #ifdef USE_ONLY_8DOT3
     232             :           if (opt.mangle_dos_filenames)
     233             :             {
     234             :               /* It is quite common for DOS systems to have only one
     235             :                  dot in a filename.  If we have something like this,
     236             :                  we simple replace the suffix except in cases where
     237             :                  the suffix is larger than 3 characters and not the
     238             :                  same as the new one.  We don't map the filenames to
     239             :                  8.3 because this is a duty of the file system.  */
     240             :               char *dot;
     241             :               const char *newsfx;
     242             : 
     243             :               newsfx = (mode==1 ? ".asc" :
     244             :                         mode==2 ? ".sig" :
     245             :                         mode==3 ? ".rev" : ".gpg");
     246             : 
     247             :               buf = xmalloc (strlen(iname)+4+1);
     248             :               strcpy (buf, iname);
     249             :               dot = strchr (buf, '.' );
     250             :               if ( dot && dot > buf && dot[1] && strlen(dot) <= 4
     251             :                    && CMP_FILENAME (newsfx, dot) )
     252             :                 strcpy (dot, newsfx);
     253             :               else if (dot && !dot[1]) /* Do not duplicate a dot.  */
     254             :                 strcpy (dot, newsfx+1);
     255             :               else
     256             :                 strcat (buf, newsfx);
     257             :             }
     258             :           if (!buf)
     259             : #endif /* USE_ONLY_8DOT3 */
     260             :             {
     261           4 :               buf = xstrconcat (iname,
     262             :                                 (mode==1 ? EXTSEP_S "asc" :
     263           4 :                                  mode==2 ? EXTSEP_S "sig" :
     264           2 :                                  mode==3 ? EXTSEP_S "rev" :
     265             :                                  /*     */ EXTSEP_S GPGEXT_GPG),
     266             :                                 NULL);
     267             :             }
     268           2 :           name = buf;
     269             :         }
     270             : 
     271         566 :       rc = 0;
     272        1132 :       while ( !overwrite_filep (name) )
     273             :         {
     274           0 :           char *tmp = ask_outfile_name (NULL, 0);
     275           0 :           if ( !tmp || !*tmp )
     276             :             {
     277           0 :               xfree (tmp);
     278           0 :               rc = gpg_error (GPG_ERR_EEXIST);
     279           0 :               break;
     280             :             }
     281           0 :           xfree (buf);
     282           0 :           name = buf = tmp;
     283             :         }
     284             : 
     285         566 :       if ( !rc )
     286             :         {
     287         566 :           if (is_secured_filename (name) )
     288             :             {
     289           0 :               *a = NULL;
     290           0 :               gpg_err_set_errno (EPERM);
     291             :             }
     292             :           else
     293         566 :             *a = iobuf_create (name, restrictedperm);
     294         566 :           if (!*a)
     295             :             {
     296           0 :               rc = gpg_error_from_syserror ();
     297           0 :               log_error(_("can't create '%s': %s\n"), name, strerror(errno) );
     298             :             }
     299         566 :           else if( opt.verbose )
     300           3 :             log_info (_("writing to '%s'\n"), name );
     301             :         }
     302         566 :       xfree(buf);
     303             :     }
     304             : 
     305         608 :   if (*a)
     306         608 :     iobuf_ioctl (*a, IOBUF_IOCTL_NO_CACHE, 1, NULL);
     307             : 
     308         608 :   return rc;
     309             : }
     310             : 
     311             : 
     312             : /* Find a matching data file for the signature file SIGFILENAME and
     313             :    return it as a malloced string.  If no matching data file is found,
     314             :    return NULL.  */
     315             : char *
     316         176 : get_matching_datafile (const char *sigfilename)
     317             : {
     318         176 :   char *fname = NULL;
     319             :   size_t len;
     320             : 
     321         176 :   if (iobuf_is_pipe_filename (sigfilename))
     322         153 :     return NULL;
     323             : 
     324          23 :   len = strlen (sigfilename);
     325          23 :   if (len > 4
     326          23 :       && (!strcmp (sigfilename + len - 4, EXTSEP_S "sig")
     327          23 :           || (len > 5 && !strcmp(sigfilename + len - 5, EXTSEP_S "sign"))
     328          23 :           || !strcmp(sigfilename + len - 4, EXTSEP_S "asc")))
     329             :     {
     330             : 
     331           0 :       fname = xstrdup (sigfilename);
     332           0 :       fname[len-(fname[len-1]=='n'?5:4)] = 0 ;
     333           0 :       if (access (fname, R_OK ))
     334             :         {
     335             :           /* Not found or other error.  */
     336           0 :           xfree (fname);
     337           0 :           fname = NULL;
     338             :         }
     339             :     }
     340             : 
     341          23 :   return fname;
     342             : }
     343             : 
     344             : 
     345             : /*
     346             :  * Try to open a file without the extension ".sig" or ".asc"
     347             :  * Return NULL if such a file is not available.
     348             :  */
     349             : iobuf_t
     350          16 : open_sigfile (const char *sigfilename, progress_filter_context_t *pfx)
     351             : {
     352          16 :   iobuf_t a = NULL;
     353             :   char *buf;
     354             : 
     355          16 :   buf = get_matching_datafile (sigfilename);
     356          16 :   if (buf)
     357             :     {
     358           0 :       a = iobuf_open (buf);
     359           0 :       if (a && is_secured_file (iobuf_get_fd (a)))
     360             :         {
     361           0 :           iobuf_close (a);
     362           0 :           a = NULL;
     363           0 :           gpg_err_set_errno (EPERM);
     364             :         }
     365           0 :       if (a)
     366           0 :         log_info (_("assuming signed data in '%s'\n"), buf);
     367           0 :       if (a && pfx)
     368           0 :         handle_progress (pfx, a, buf);
     369           0 :       xfree (buf);
     370             :     }
     371             : 
     372          16 :   return a;
     373             : }
     374             : 
     375             : 
     376             : /****************
     377             :  * Copy the option file skeleton for NAME to the given directory.
     378             :  * Returns true if the new option file has any option.
     379             :  */
     380             : static int
     381           0 : copy_options_file (const char *destdir, const char *name)
     382             : {
     383           0 :   const char *datadir = gnupg_datadir ();
     384             :   char *fname;
     385             :   FILE *src, *dst;
     386           0 :   int linefeeds=0;
     387             :   int c;
     388             :   mode_t oldmask;
     389           0 :   int esc = 0;
     390           0 :   int any_option = 0;
     391             : 
     392           0 :   if (opt.dry_run)
     393           0 :     return 0;
     394             : 
     395           0 :   fname = xstrconcat (datadir, DIRSEP_S, name, "-conf", SKELEXT, NULL);
     396           0 :   src = fopen (fname, "r");
     397           0 :   if (src && is_secured_file (fileno (src)))
     398             :     {
     399           0 :       fclose (src);
     400           0 :       src = NULL;
     401           0 :       gpg_err_set_errno (EPERM);
     402             :     }
     403           0 :   if (!src)
     404             :     {
     405           0 :       log_info (_("can't open '%s': %s\n"), fname, strerror(errno));
     406           0 :       xfree(fname);
     407           0 :       return 0;
     408             :     }
     409           0 :   xfree (fname);
     410           0 :   fname = xstrconcat (destdir, DIRSEP_S, name, EXTSEP_S, "conf", NULL);
     411             : 
     412           0 :   oldmask = umask (077);
     413           0 :   if (is_secured_filename (fname))
     414             :     {
     415           0 :       dst = NULL;
     416           0 :       gpg_err_set_errno (EPERM);
     417             :     }
     418             :   else
     419           0 :     dst = fopen( fname, "w" );
     420           0 :   umask (oldmask);
     421             : 
     422           0 :   if (!dst)
     423             :     {
     424           0 :       log_info (_("can't create '%s': %s\n"), fname, strerror(errno) );
     425           0 :       fclose (src);
     426           0 :       xfree (fname);
     427           0 :       return 0;
     428             :     }
     429             : 
     430           0 :   while ((c = getc (src)) != EOF)
     431             :     {
     432           0 :       if (linefeeds < 3)
     433             :         {
     434           0 :           if (c == '\n')
     435           0 :             linefeeds++;
     436             :         }
     437             :       else
     438             :         {
     439           0 :           putc (c, dst);
     440           0 :           if (c== '\n')
     441           0 :             esc = 1;
     442           0 :           else if (esc == 1)
     443             :             {
     444           0 :               if (c == ' ' || c == '\t')
     445             :                 ;
     446           0 :               else if (c == '#')
     447           0 :                 esc = 2;
     448             :               else
     449           0 :                 any_option = 1;
     450             :             }
     451             :         }
     452             :     }
     453             : 
     454           0 :   fclose (dst);
     455           0 :   fclose (src);
     456             : 
     457           0 :   log_info (_("new configuration file '%s' created\n"), fname);
     458           0 :   xfree (fname);
     459           0 :   return any_option;
     460             : }
     461             : 
     462             : 
     463             : void
     464           0 : try_make_homedir (const char *fname)
     465             : {
     466           0 :   const char *defhome = standard_homedir ();
     467             : 
     468             :   /* Create the directory only if the supplied directory name is the
     469             :      same as the default one.  This way we avoid to create arbitrary
     470             :      directories when a non-default home directory is used.  To cope
     471             :      with HOME, we do compare only the suffix if we see that the
     472             :      default homedir does start with a tilde.  */
     473           0 :   if ( opt.dry_run || opt.no_homedir_creation )
     474           0 :     return;
     475             : 
     476           0 :   if (
     477             : #ifdef HAVE_W32_SYSTEM
     478             :       ( !compare_filenames (fname, defhome) )
     479             : #else
     480           0 :       ( *defhome == '~'
     481           0 :         && (strlen(fname) >= strlen (defhome+1)
     482           0 :             && !strcmp(fname+strlen(fname)-strlen(defhome+1), defhome+1 ) ))
     483           0 :       || (*defhome != '~'  && !compare_filenames( fname, defhome ) )
     484             : #endif
     485             :       )
     486             :     {
     487           0 :       if (gnupg_mkdir (fname, "-rwx"))
     488           0 :         log_fatal ( _("can't create directory '%s': %s\n"),
     489           0 :                     fname, strerror(errno) );
     490           0 :       else if (!opt.quiet )
     491           0 :         log_info ( _("directory '%s' created\n"), fname );
     492             : 
     493             :       /* Note that we also copy a dirmngr.conf file here.  This is
     494             :          because gpg is likely the first invoked tool and thus creates
     495             :          the directory.  */
     496           0 :       copy_options_file (fname, DIRMNGR_NAME);
     497           0 :       if (copy_options_file (fname, GPG_NAME))
     498           0 :         log_info (_("WARNING: options in '%s'"
     499             :                     " are not yet active during this run\n"),
     500             :                   fname);
     501             :     }
     502             : }
     503             : 
     504             : 
     505             : /* Get and if needed create a string with the directory used to store
     506             :    openpgp revocations.  */
     507             : char *
     508           2 : get_openpgp_revocdir (const char *home)
     509             : {
     510             :   char *fname;
     511             :   struct stat statbuf;
     512             : 
     513           2 :   fname = make_filename (home, GNUPG_OPENPGP_REVOC_DIR, NULL);
     514           2 :   if (stat (fname, &statbuf) && errno == ENOENT)
     515             :     {
     516           1 :       if (gnupg_mkdir (fname, "-rwx"))
     517           0 :         log_error (_("can't create directory '%s': %s\n"),
     518           0 :                    fname, strerror (errno) );
     519           1 :       else if (!opt.quiet)
     520           0 :         log_info (_("directory '%s' created\n"), fname);
     521             :     }
     522           2 :   return fname;
     523             : }

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