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gnupg/g10/photoid.c
Werner Koch 1b60aab2c4
gpg: Make progress work for large files on Windows.
* common/iobuf.c (iobuf_get_filelength): Change return type to
uint64_t and remove the overflow args.  For Windows always use
GetFileSizeEx which is available since the long EOL-ed Windows XP.

* g10/sign.c (write_plaintext_packet): Adjust for changed
iobuf_get_filelength.
* g10/encrypt.c (encrypt_simple, encrypt_crypt): Ditto.
* g10/photoid.c (generate_photo_id): Ditto.  Also add an upper limit.

* g10/filter.h (progress_filter_context_t): Change amount values to
use uint64_t.
* g10/progress.c (write_status_progress): Change accordingly.

--
GnuPG-bug-id: 6534

Backported-from: 808494b485
2023-07-05 11:30:16 +02:00

408 lines
9.6 KiB
C

/* photoid.c - photo ID handling code
* Copyright (C) 2001, 2002, 2005, 2006, 2008, 2011 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#ifdef _WIN32
# ifdef HAVE_WINSOCK2_H
# include <winsock2.h>
# endif
# include <windows.h>
# ifndef VER_PLATFORM_WIN32_WINDOWS
# define VER_PLATFORM_WIN32_WINDOWS 1
# endif
#endif
#include "gpg.h"
#include "../common/util.h"
#include "packet.h"
#include "../common/status.h"
#include "exec.h"
#include "keydb.h"
#include "../common/i18n.h"
#include "../common/iobuf.h"
#include "options.h"
#include "main.h"
#include "photoid.h"
#include "../common/ttyio.h"
#include "trustdb.h"
/* Generate a new photo id packet, or return NULL if canceled.
FIXME: Should we add a duplicates check similar to generate_user_id? */
PKT_user_id *
generate_photo_id (ctrl_t ctrl, PKT_public_key *pk,const char *photo_name)
{
PKT_user_id *uid;
int error=1,i;
uint64_t len;
char *filename;
byte *photo=NULL;
byte header[16];
IOBUF file;
header[0]=0x10; /* little side of photo header length */
header[1]=0; /* big side of photo header length */
header[2]=1; /* 1 == version of photo header */
header[3]=1; /* 1 == JPEG */
for(i=4;i<16;i++) /* The reserved bytes */
header[i]=0;
#define EXTRA_UID_NAME_SPACE 71
uid=xmalloc_clear(sizeof(*uid)+71);
if(photo_name && *photo_name)
filename=make_filename(photo_name,(void *)NULL);
else
{
tty_printf(_("\nPick an image to use for your photo ID."
" The image must be a JPEG file.\n"
"Remember that the image is stored within your public key."
" If you use a\n"
"very large picture, your key will become very large"
" as well!\n"
"Keeping the image close to 240x288 is a good size"
" to use.\n"));
filename=NULL;
}
while(photo==NULL)
{
if(filename==NULL)
{
char *tempname;
tty_printf("\n");
tty_enable_completion(NULL);
tempname=cpr_get("photoid.jpeg.add",
_("Enter JPEG filename for photo ID: "));
tty_disable_completion();
filename=make_filename(tempname,(void *)NULL);
xfree(tempname);
if(strlen(filename)==0)
goto scram;
}
file=iobuf_open(filename);
if (file && is_secured_file (iobuf_get_fd (file)))
{
iobuf_close (file);
file = NULL;
gpg_err_set_errno (EPERM);
}
if(!file)
{
log_error(_("unable to open JPEG file '%s': %s\n"),
filename,strerror(errno));
xfree(filename);
filename=NULL;
continue;
}
len = iobuf_get_filelength(file);
if(len>6144)
{
/* We silently skip JPEGs larger than 1MiB because we have a
* 2MiB limit on the user ID packets and we need some limit
* anyway because the returned u64 is larger than the u32 or
* OpenPGP. Note that the diagnostic may print a wrong
* value if the value is really large; we don't fix this to
* avoid a string change. */
tty_printf( _("This JPEG is really large (%d bytes) !\n"), (int)len);
if(len > 1024*1024
|| !cpr_get_answer_is_yes("photoid.jpeg.size",
_("Are you sure you want to use it? (y/N) ")))
{
iobuf_close(file);
xfree(filename);
filename=NULL;
continue;
}
}
photo=xmalloc(len);
iobuf_read(file,photo,len);
iobuf_close(file);
/* Is it a JPEG? */
if(photo[0]!=0xFF || photo[1]!=0xD8)
{
log_error(_("'%s' is not a JPEG file\n"),filename);
xfree(photo);
photo=NULL;
xfree(filename);
filename=NULL;
continue;
}
/* Build the packet */
build_attribute_subpkt(uid,1,photo,len,header,16);
parse_attribute_subpkts(uid);
make_attribute_uidname(uid, EXTRA_UID_NAME_SPACE);
/* Showing the photo is not safe when noninteractive since the
"user" may not be able to dismiss a viewer window! */
if(opt.command_fd==-1)
{
show_photos (ctrl, uid->attribs, uid->numattribs, pk, uid);
switch(cpr_get_answer_yes_no_quit("photoid.jpeg.okay",
_("Is this photo correct (y/N/q)? ")))
{
case -1:
goto scram;
case 0:
free_attributes(uid);
xfree(photo);
photo=NULL;
xfree(filename);
filename=NULL;
continue;
}
}
}
error=0;
uid->ref=1;
scram:
xfree(filename);
xfree(photo);
if(error)
{
free_attributes(uid);
xfree(uid);
return NULL;
}
return uid;
}
/* Returns 0 for error, 1 for valid */
int parse_image_header(const struct user_attribute *attr,byte *type,u32 *len)
{
u16 headerlen;
if(attr->len<3)
return 0;
/* For historical reasons (i.e. "oops!"), the header length is
little endian. */
headerlen=(attr->data[1]<<8) | attr->data[0];
if(headerlen>attr->len)
return 0;
if(type && attr->len>=4)
{
if(attr->data[2]==1) /* header version 1 */
*type=attr->data[3];
else
*type=0;
}
*len=attr->len-headerlen;
if(*len==0)
return 0;
return 1;
}
/* style==0 for extension, 1 for name, 2 for MIME type. Remember that
the "name" style string could be used in a user ID name field, so
make sure it is not too big (see parse-packet.c:parse_attribute).
Extensions should be 3 characters long for the best cross-platform
compatibility. */
char *image_type_to_string(byte type,int style)
{
char *string;
switch(type)
{
case 1: /* jpeg */
if(style==0)
string="jpg";
else if(style==1)
string="jpeg";
else
string="image/jpeg";
break;
default:
if(style==0)
string="bin";
else if(style==1)
string="unknown";
else
string="image/x-unknown";
break;
}
return string;
}
#if !defined(FIXED_PHOTO_VIEWER) && !defined(DISABLE_PHOTO_VIEWER)
static const char *
get_default_photo_command(void)
{
#if defined(_WIN32)
OSVERSIONINFO osvi;
memset(&osvi,0,sizeof(osvi));
osvi.dwOSVersionInfoSize=sizeof(osvi);
GetVersionEx(&osvi);
if(osvi.dwPlatformId==VER_PLATFORM_WIN32_WINDOWS)
return "start /w %i";
else
return "!ShellExecute 400 %i";
#elif defined(__APPLE__)
/* OS X. This really needs more than just __APPLE__. */
return "open %I";
#elif defined(__riscos__)
return "Filer_Run %I";
#else
if (!path_access ("xloadimage", X_OK))
return "xloadimage -fork -quiet -title 'KeyID 0x%k' stdin";
else if (!path_access ("display",X_OK))
return "display -title 'KeyID 0x%k' %i";
else if (getuid () && !path_access ("xdg-open", X_OK))
{
/* xdg-open spawns the actual program and exits so we need to
* keep the temp file */
return "xdg-open %I";
}
else
return "/bin/true";
#endif
}
#endif
void
show_photos (ctrl_t ctrl, const struct user_attribute *attrs, int count,
PKT_public_key *pk, PKT_user_id *uid)
{
#ifdef DISABLE_PHOTO_VIEWER
(void)attrs;
(void)count;
(void)pk;
(void)uid;
#else /*!DISABLE_PHOTO_VIEWER*/
int i;
struct expando_args args;
u32 len;
u32 kid[2]={0,0};
memset (&args, 0, sizeof(args));
args.pk = pk;
args.validity_info = get_validity_info (ctrl, NULL, pk, uid);
args.validity_string = get_validity_string (ctrl, pk, uid);
namehash_from_uid (uid);
args.namehash = uid->namehash;
if (pk)
keyid_from_pk (pk, kid);
es_fflush (es_stdout);
for(i=0;i<count;i++)
if(attrs[i].type==ATTRIB_IMAGE &&
parse_image_header(&attrs[i],&args.imagetype,&len))
{
char *command,*name;
struct exec_info *spawn;
int offset=attrs[i].len-len;
#ifdef FIXED_PHOTO_VIEWER
opt.photo_viewer=FIXED_PHOTO_VIEWER;
#else
if(!opt.photo_viewer)
opt.photo_viewer=get_default_photo_command();
#endif
/* make command grow */
command=pct_expando(opt.photo_viewer,&args);
if(!command)
goto fail;
if (!*command)
{
xfree (command);
goto fail;
}
name=xmalloc(16+strlen(EXTSEP_S)+
strlen(image_type_to_string(args.imagetype,0))+1);
/* Make the filename. Notice we are not using the image
encoding type for more than cosmetics. Most external image
viewers can handle a multitude of types, and even if one
cannot understand a particular type, we have no way to know
which. The spec permits this, by the way. -dms */
#ifdef USE_ONLY_8DOT3
sprintf(name,"%08lX" EXTSEP_S "%s",(ulong)kid[1],
image_type_to_string(args.imagetype,0));
#else
sprintf(name,"%08lX%08lX" EXTSEP_S "%s",(ulong)kid[0],(ulong)kid[1],
image_type_to_string(args.imagetype,0));
#endif
if(exec_write(&spawn,NULL,command,name,1,1)!=0)
{
xfree(name);
goto fail;
}
#ifdef __riscos__
riscos_set_filetype_by_mimetype(spawn->tempfile_in,
image_type_to_string(args.imagetype,2));
#endif
xfree(name);
fwrite(&attrs[i].data[offset],attrs[i].len-offset,1,spawn->tochild);
if(exec_read(spawn)!=0)
{
exec_finish(spawn);
goto fail;
}
if(exec_finish(spawn)!=0)
goto fail;
}
return;
fail:
log_error(_("unable to display photo ID!\n"));
#endif /*!DISABLE_PHOTO_VIEWER*/
}