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