mirror of
git://git.gnupg.org/gnupg.git
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Sylvester Version
This commit is contained in:
Werner Koch
parent
c351df1dc5
commit
4d2636eafe
20 changed files with 1971 additions and 144 deletions
696
g10/armor.c
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696
g10/armor.c
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@ -0,0 +1,696 @@
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/* armor.c - Armor filter
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* Copyright (c) 1997 by Werner Koch (dd9jn)
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*
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* This file is part of G10.
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*
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* G10 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 2 of the License, or
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* (at your option) any later version.
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*
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* G10 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include "errors.h"
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#include "iobuf.h"
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#include "memory.h"
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#include "util.h"
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#include "filter.h"
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#include "packet.h"
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#include "options.h"
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#define CRCINIT 0xB704CE
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#define CRCPOLY 0X864CFB
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#define CRCUPDATE(a,c) do { \
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a = ((a) << 8) ^ crc_table[((a)&0xff >> 16) ^ (c)]; \
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a &= 0x00ffffff; \
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} while(0)
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static u32 crc_table[256];
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static byte bintoasc[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+/";
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static byte asctobin[256]; /* runtime initialized */
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static int is_initialized;
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typedef enum {
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fhdrINIT=0,
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fhdrLF,
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fhdrWAIT,
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fhdrWAITINFO,
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fhdrWAITCLEARSIG,
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fhdrDASH,
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fhdrHEAD,
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fhdrDASH2,
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fhdrINFO
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} fhdr_state_t;
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struct fhdr_struct {
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fhdr_state_t state;
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int count;
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int hdr_line; /* number of the header line */
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char buf[256];
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};
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/* if we encounter this armor string with this index, go
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* into a mode, which fakes packets and wait for the next armor */
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#define BEGIN_SIGNED_MSG_IDX 3
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static char *head_strings[] = {
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"BEGIN PGP MESSAGE",
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"BEGIN PGP PUBLIC KEY BLOCK",
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"BEGIN PGP SIGNATURE",
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"BEGIN PGP SIGNED MESSAGE",
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NULL
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};
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static char *tail_strings[] = {
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"END PGP MESSAGE",
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"END PGP PUBLIC KEY BLOCK",
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"END PGP SIGNATURE",
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NULL
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};
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static void
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initialize(void)
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{
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int i, j;
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u32 t;
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byte *s;
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/* init the crc lookup table */
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crc_table[0] = 0;
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for(i=j=0; j < 128; j++ ) {
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t = crc_table[j];
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if( t & 0x00800000 ) {
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t <<= 1;
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crc_table[i++] = t ^ CRCPOLY;
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crc_table[i++] = t;
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}
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else {
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t <<= 1;
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crc_table[i++] = t;
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crc_table[i++] = t ^ CRCPOLY;
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}
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}
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/* build the helptable for radix64 to bin conversion */
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for(i=0; i < 256; i++ )
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asctobin[i] = 255; /* used to detect invalid characters */
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for(s=bintoasc,i=0; *s; s++,i++ )
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asctobin[*s] = i;
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is_initialized=1;
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}
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/****************
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* Check wether this is a armored file or not
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* See also parse-packet.c for details on this code
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* Returns: True if it seems to be armored
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*/
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static int
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is_armored( byte *buf, size_t len )
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{
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int ctb, pkttype;
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if( len < 28 )
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return 0; /* not even enough space for the "---BEGIN"... */
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ctb = *buf;
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if( !(ctb & 0x80) )
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return 1; /* invalid packet: assume it is armored */
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pkttype = ctb & 0x40 ? (ctb & 0x3f) : ((ctb>>2)&0xf);
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/*lenbytes = (ctb & 0x40) || ((ctb&3)==3)? 0 : (1<<(ctb & 3));*/
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switch( pkttype ) {
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case PKT_PUBLIC_CERT:
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case PKT_SECRET_CERT:
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case PKT_PUBKEY_ENC:
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case PKT_SIGNATURE:
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case PKT_COMMENT:
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case PKT_PLAINTEXT:
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case PKT_COMPRESSED:
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case PKT_ENCRYPTED:
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return 0; /* seems to be a regular packet: not armored */
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}
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return 1;
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}
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static int
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find_header( struct fhdr_struct *fhdr, int c )
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{
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int i;
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const char *s;
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if( c == '\n' ) {
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switch( fhdr->state ) {
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case fhdrINFO:
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if( !fhdr->count )
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return 1; /* blank line: data starts with the next line */
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fhdr->buf[fhdr->count] = 0;
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log_debug("armor line: '%s'\n", fhdr->buf );
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/* fall through */
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case fhdrWAITINFO:
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fhdr->state = fhdrINFO;
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fhdr->count = 0;
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break;
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case fhdrWAITCLEARSIG:
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if( fhdr->count++ == 1 ) /* skip the empty line */
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return 1; /* clear signed text follows */
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else if( fhdr->count > 1 )
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fhdr->state = fhdrWAIT; /* was not valid */
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break;
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default:
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fhdr->state = fhdrLF;
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break;
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}
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}
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else {
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switch( fhdr->state ) {
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case fhdrINIT:
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case fhdrLF:
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if( c == '-' ) {
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fhdr->state = fhdrDASH;
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fhdr->count = 1;
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}
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else
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fhdr->state = fhdrWAIT;
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break;
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case fhdrWAIT:
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case fhdrWAITINFO:
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case fhdrWAITCLEARSIG:
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break;
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case fhdrDASH:
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if( c == '-' ) {
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if( ++fhdr->count == 5 ) {
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fhdr->state = fhdrHEAD;
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fhdr->count = 0;
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}
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}
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else
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fhdr->state = fhdrWAIT;
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break;
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case fhdrHEAD:
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if( c != '-' ) {
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if( fhdr->count < DIM(fhdr->buf)-1 )
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fhdr->buf[fhdr->count++] = c;
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}
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else {
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fhdr->buf[fhdr->count] = 0;
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for(i=0; (s=head_strings[i]); i++ )
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if( !strcmp(s,fhdr->buf) )
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break;
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if( s ) { /* found string; wait for trailing dashes */
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fhdr->hdr_line = i;
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fhdr->state = fhdrDASH2;
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fhdr->count = 1;
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}
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else
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fhdr->state = fhdrWAIT;
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}
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break;
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case fhdrDASH2:
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if( c == '-' ) {
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if( ++fhdr->count == 5 ) {
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fhdr->state = fhdrWAITINFO;
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log_debug("armor head: '%s'\n",
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head_strings[fhdr->hdr_line]);
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fhdr->state = fhdr->hdr_line == BEGIN_SIGNED_MSG_IDX
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? fhdrWAITCLEARSIG : fhdrWAITINFO;
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if( fhdr->state == fhdrWAITCLEARSIG )
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fhdr->count = 0;
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}
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}
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else
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fhdr->state = fhdrWAIT;
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break;
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case fhdrINFO:
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if( fhdr->count < DIM(fhdr->buf)-1 )
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fhdr->buf[fhdr->count++] = c;
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break;
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default: abort();
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}
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}
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return 0;
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}
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/****************
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* check wether the trailer is okay.
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* Returns: 0 := still in trailer
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* -1 := Okay
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* 1 := Error in trailer
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*/
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static int
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check_trailer( struct fhdr_struct *fhdr, int c )
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{
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return -1;
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/* FIXME: implement this ! */
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}
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/* figure out wether the data is armored or not */
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static int
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check_input( armor_filter_context_t *afx, IOBUF a )
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{
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int rc = 0;
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int c;
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size_t n = 0, nn=0, nn_limit=0;
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struct fhdr_struct fhdr;
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assert( DIM(afx->helpbuf) >= 50 );
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memset( &fhdr, 0, sizeof(fhdr) );
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/* read a couple of bytes */
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for( n=0; n < DIM(afx->helpbuf); n++ ) {
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if( (c=iobuf_get(a)) == -1 )
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break;
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afx->helpbuf[n] = c & 0xff;
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}
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if( !n )
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rc = -1;
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else if( is_armored( afx->helpbuf, n ) ) {
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for(nn=0; nn < n; nn++ )
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if( find_header( &fhdr, afx->helpbuf[nn] ) )
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break;
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if( nn == n ) { /* continue read */
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while( (c=iobuf_get(a)) != -1 )
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if( find_header( &fhdr, c ) )
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break;
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if( c == -1 )
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rc = -1; /* eof */
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}
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if( !rc && fhdr.hdr_line == BEGIN_SIGNED_MSG_IDX ) {
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/* start fake package mode (for clear signatures) */
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nn++;
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afx->helplen = n;
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afx->helpidx = nn;
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afx->templen = 0;
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afx->tempidx = 0;
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afx->fake = m_alloc_clear( sizeof(struct fhdr_struct) );
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}
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else if( !rc ) {
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/* next byte to read or helpbuf[nn+1]
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* is the first rad64 byte */
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nn++;
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afx->inp_checked = 1;
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afx->crc = CRCINIT;
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afx->idx = 0;
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afx->radbuf[0] = 0;
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afx->helplen = n;
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afx->helpidx = nn;
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}
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}
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else {
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afx->inp_checked = 1;
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afx->inp_bypass = 1;
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}
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return rc;
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}
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/* fake a literal data packet and wait for an armor line */
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static int
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fake_packet( armor_filter_context_t *afx, IOBUF a,
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size_t *retn, byte *buf, size_t size )
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{
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int rc = 0;
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int c;
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size_t n = 0, nn=0, nn_limit=0;
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struct fhdr_struct *fhdr = afx->fake;
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byte *helpbuf = afx->helpbuf;
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int helpidx = afx->helpidx;
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int helplen = afx->helplen;
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byte *tempbuf = afx->tempbuf;
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int tempidx = afx->tempidx;
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int templen = afx->templen;
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int defer=1;
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/* FIXME: have to read one ahead or do some other mimic to
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* get rid of the lf before the "begin signed message"
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*/
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size = 100; /* FIXME: only used for testing (remove it) */
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n = 2; /* reserve 2 bytes for the length header */
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while( n < size-2 ) { /* and 2 for the term header */
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if( templen && (fhdr->state == fhdrWAIT || fhdr->state == fhdrLF) ) {
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if( tempidx < templen ) {
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buf[n++] = tempbuf[tempidx++];
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continue;
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}
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tempidx = templen = 0;
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}
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if( helpidx < helplen )
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c = helpbuf[helpidx++];
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else if( (c=iobuf_get(a)) == -1 )
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break;
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if( find_header( fhdr, c ) ) {
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m_free(afx->fake);
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afx->fake = NULL;
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afx->inp_checked = 1;
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afx->crc = CRCINIT;
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afx->idx = 0;
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afx->radbuf[0] = 0;
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/* we don't need to care about the tempbuf */
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break;
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}
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if( fhdr->state == fhdrWAIT || fhdr->state == fhdrLF ) {
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if( templen ) {
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tempidx = 0;
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continue;
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}
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buf[n++] = c;
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}
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else if( fhdr->state == fhdrWAITINFO
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|| fhdr->state == fhdrINFO )
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;
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else { /* store it in another temp. buf */
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assert( templen < DIM(afx->tempbuf) );
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tempbuf[templen++] = c;
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}
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}
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buf[0] = (n-2) >> 8;
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buf[1] = (n-2);
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if( !afx->fake ) { /* write last (ending) length header */
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buf[n++] = 0;
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buf[n++] = 0;
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}
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afx->helpidx = helpidx;
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afx->helplen = helplen;
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afx->tempidx = tempidx;
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afx->templen = templen;
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*retn = n;
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return rc;
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}
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static int
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radix64_read( armor_filter_context_t *afx, IOBUF a, size_t *retn,
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byte *buf, size_t size )
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{
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byte val;
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int c, c2;
|
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int checkcrc=0;
|
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int rc = 0;
|
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size_t n = 0, nn=0;
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int idx, i;
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u32 crc;
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|
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crc = afx->crc;
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idx = afx->idx;
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val = afx->radbuf[0];
|
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for( n=0; n < size; ) {
|
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if( afx->helpidx < afx->helplen )
|
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c = afx->helpbuf[afx->helpidx++];
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else if( (c=iobuf_get(a)) == -1 )
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break;
|
||||
if( c == '\n' || c == ' ' || c == '\r' || c == '\t' )
|
||||
continue;
|
||||
else if( c == '=' ) { /* pad character: stop */
|
||||
if( idx == 1 )
|
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buf[n++] = val;
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checkcrc++;
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break;
|
||||
}
|
||||
else if( (c = asctobin[(c2=c)]) == 255 ) {
|
||||
log_error("invalid radix64 character %02x skipped\n", c2);
|
||||
continue;
|
||||
}
|
||||
switch(idx) {
|
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case 0: val = c << 2; break;
|
||||
case 1: val |= (c>>4)&3; buf[n++]=val;val=(c<<4)&0xf0;break;
|
||||
case 2: val |= (c>>2)&15; buf[n++]=val;val=(c<<6)&0xc0;break;
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case 3: val |= c&0x3f; buf[n++] = val; break;
|
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}
|
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idx = (idx+1) % 4;
|
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}
|
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for(i=0; i < n; i++ )
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crc = (crc << 8) ^ crc_table[(crc >> 16)&0xff ^ buf[i]];
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crc &= 0x00ffffff;
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afx->crc = crc;
|
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afx->idx = idx;
|
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afx->radbuf[0] = val;
|
||||
if( checkcrc ) {
|
||||
afx->inp_eof = 1; /*assume eof */
|
||||
for(;;) { /* skip lf and pad characters */
|
||||
if( afx->helpidx < afx->helplen )
|
||||
c = afx->helpbuf[afx->helpidx++];
|
||||
else if( (c=iobuf_get(a)) == -1 )
|
||||
break;
|
||||
if( c == '\n' || c == ' ' || c == '\r'
|
||||
|| c == '\t' || c == '=' )
|
||||
continue;
|
||||
break;
|
||||
}
|
||||
if( c == -1 )
|
||||
log_error("premature eof (no CRC)\n");
|
||||
else {
|
||||
u32 mycrc = 0;
|
||||
idx = 0;
|
||||
do {
|
||||
if( (c = asctobin[c]) == 255 )
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||||
break;
|
||||
switch(idx) {
|
||||
case 0: val = c << 2; break;
|
||||
case 1: val |= (c>>4)&3; mycrc |= val << 16;val=(c<<4)&0xf0;break;
|
||||
case 2: val |= (c>>2)&15; mycrc |= val << 8;val=(c<<6)&0xc0;break;
|
||||
case 3: val |= c&0x3f; mycrc |= val; break;
|
||||
}
|
||||
if( afx->helpidx < afx->helplen )
|
||||
c = afx->helpbuf[afx->helpidx++];
|
||||
else if( (c=iobuf_get(a)) == -1 )
|
||||
break;
|
||||
} while( ++idx < 4 );
|
||||
if( c == -1 )
|
||||
log_error("premature eof (in CRC)\n");
|
||||
else if( idx != 4 )
|
||||
log_error("malformed CRC\n");
|
||||
else if( mycrc != afx->crc )
|
||||
log_error("CRC error; %06lx - %06lx\n",
|
||||
(ulong)afx->crc, (ulong)mycrc);
|
||||
else {
|
||||
struct fhdr_struct fhdr;
|
||||
|
||||
memset( &fhdr, 0, sizeof(fhdr) );
|
||||
for(rc=0;!rc;) {
|
||||
rc = check_trailer( &fhdr, c );
|
||||
if( !rc ) {
|
||||
if( afx->helpidx < afx->helplen )
|
||||
c = afx->helpbuf[afx->helpidx++];
|
||||
else if( (c=iobuf_get(a)) == -1 )
|
||||
rc = 2;
|
||||
}
|
||||
}
|
||||
if( rc == -1 )
|
||||
rc = 0;
|
||||
else if( rc == 2 )
|
||||
log_error("premature eof (in Trailer)\n");
|
||||
else
|
||||
log_error("error in trailer line\n");
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if( !n )
|
||||
rc = -1;
|
||||
|
||||
*retn = n;
|
||||
return rc;
|
||||
}
|
||||
|
||||
|
||||
/****************
|
||||
* The filter is used to handle the armor stuff
|
||||
*/
|
||||
int
|
||||
armor_filter( void *opaque, int control,
|
||||
IOBUF a, byte *buf, size_t *ret_len)
|
||||
{
|
||||
size_t size = *ret_len;
|
||||
armor_filter_context_t *afx = opaque;
|
||||
int rc=0, i, c, c2;
|
||||
byte radbuf[3];
|
||||
int idx, idx2;
|
||||
size_t n=0;
|
||||
u32 crc;
|
||||
|
||||
if( DBG_FILTER )
|
||||
log_debug("armor-filter: control: %d\n", control );
|
||||
if( control == IOBUFCTRL_UNDERFLOW && afx->inp_bypass ) {
|
||||
for( n=0; n < size; n++ ) {
|
||||
if( (c=iobuf_get(a)) == -1 )
|
||||
break;
|
||||
buf[n] = c & 0xff;
|
||||
}
|
||||
if( !n )
|
||||
rc = -1;
|
||||
*ret_len = n;
|
||||
}
|
||||
else if( control == IOBUFCTRL_UNDERFLOW ) {
|
||||
if( size < 20 )
|
||||
log_bug(NULL); /* supplied buffer maybe too short */
|
||||
|
||||
if( afx->inp_eof ) {
|
||||
*ret_len = 0;
|
||||
if( DBG_FILTER )
|
||||
log_debug("armor-filter: eof due to inp_eof flag\n" );
|
||||
return -1;
|
||||
}
|
||||
|
||||
if( afx->fake )
|
||||
rc = fake_packet( afx, a, &n, buf, size );
|
||||
else if( !afx->inp_checked ) {
|
||||
rc = check_input( afx, a );
|
||||
if( afx->inp_bypass )
|
||||
;
|
||||
else if( afx->fake ) {
|
||||
/* the buffer is at least 20 bytes long, so it
|
||||
* is easy to construct a packet */
|
||||
buf[0] = 0xaf; /* old packet format, type 11, var length */
|
||||
buf[1] = 0; /* set the length header */
|
||||
buf[2] = 6;
|
||||
buf[3] = 't'; /* canonical text */
|
||||
buf[4] = 0; /* namelength */
|
||||
buf[5] = buf[6] = buf[7] = buf[8] = 0; /* timestamp */
|
||||
n = 9;
|
||||
}
|
||||
else if( !rc )
|
||||
rc = radix64_read( afx, a, &n, buf, size );
|
||||
}
|
||||
else
|
||||
rc = radix64_read( afx, a, &n, buf, size );
|
||||
|
||||
*ret_len = n;
|
||||
}
|
||||
else if( control == IOBUFCTRL_FLUSH ) {
|
||||
if( !afx->status ) { /* write the header line */
|
||||
if( afx->what >= DIM(head_strings) )
|
||||
log_bug("afx->what=%d", afx->what);
|
||||
iobuf_writestr(a, "-----");
|
||||
iobuf_writestr(a, head_strings[afx->what] );
|
||||
iobuf_writestr(a, "-----\n");
|
||||
iobuf_writestr(a, "Version: G10 pre-release " VERSION "\n");
|
||||
iobuf_writestr(a, "Comment: This is a alpha test version!\n\n");
|
||||
afx->status++;
|
||||
afx->idx = 0;
|
||||
afx->idx2 = 0;
|
||||
afx->crc = CRCINIT;
|
||||
}
|
||||
crc = afx->crc;
|
||||
idx = afx->idx;
|
||||
idx2 = afx->idx2;
|
||||
for(i=0; i < idx; i++ )
|
||||
radbuf[i] = afx->radbuf[i];
|
||||
|
||||
for(i=0; i < size; i++ )
|
||||
crc = (crc << 8) ^ crc_table[(crc >> 16)&0xff ^ buf[i]];
|
||||
crc &= 0x00ffffff;
|
||||
|
||||
for( ; size; buf++, size-- ) {
|
||||
radbuf[idx++] = *buf;
|
||||
if( idx > 2 ) {
|
||||
idx = 0;
|
||||
c = bintoasc[(*radbuf >> 2) & 077];
|
||||
iobuf_put(a, c);
|
||||
c = bintoasc[(((*radbuf<<4)&060)|((radbuf[1] >> 4)&017))&077];
|
||||
iobuf_put(a, c);
|
||||
c = bintoasc[(((radbuf[1]<<2)&074)|((radbuf[2]>>6)&03))&077];
|
||||
iobuf_put(a, c);
|
||||
c = bintoasc[radbuf[2]&077];
|
||||
iobuf_put(a, c);
|
||||
if( ++idx2 > (72/4) ) {
|
||||
iobuf_put(a, '\n');
|
||||
idx2=0;
|
||||
}
|
||||
}
|
||||
}
|
||||
for(i=0; i < idx; i++ )
|
||||
afx->radbuf[i] = radbuf[i];
|
||||
afx->idx = idx;
|
||||
afx->idx2 = idx2;
|
||||
afx->crc = crc;
|
||||
}
|
||||
else if( control == IOBUFCTRL_INIT ) {
|
||||
if( !is_initialized )
|
||||
initialize();
|
||||
}
|
||||
else if( control == IOBUFCTRL_FREE ) {
|
||||
if( afx->status ) { /* pad, write cecksum, and bottom line */
|
||||
crc = afx->crc;
|
||||
idx = afx->idx;
|
||||
idx2 = afx->idx2;
|
||||
for(i=0; i < idx; i++ )
|
||||
radbuf[i] = afx->radbuf[i];
|
||||
if( idx ) {
|
||||
c = bintoasc[(*radbuf>>2)&077];
|
||||
iobuf_put(a, c);
|
||||
if( idx == 1 ) {
|
||||
c = bintoasc[((*radbuf << 4) & 060) & 077];
|
||||
iobuf_put(a, c);
|
||||
iobuf_put(a, '=');
|
||||
iobuf_put(a, '=');
|
||||
}
|
||||
else { /* 2 */
|
||||
c = bintoasc[(((*radbuf<<4)&060)|((radbuf[1]>>4)&017))&077];
|
||||
iobuf_put(a, c);
|
||||
c = bintoasc[((radbuf[1] << 2) & 074) & 077];
|
||||
iobuf_put(a, c);
|
||||
iobuf_put(a, '=');
|
||||
}
|
||||
++idx2;
|
||||
}
|
||||
/* may need a linefeed */
|
||||
if( idx2 < (72/4) )
|
||||
iobuf_put(a, '\n');
|
||||
/* write the CRC */
|
||||
iobuf_put(a, '=');
|
||||
radbuf[0] = crc >>16;
|
||||
radbuf[1] = crc >> 8;
|
||||
radbuf[2] = crc;
|
||||
c = bintoasc[(*radbuf >> 2) & 077];
|
||||
iobuf_put(a, c);
|
||||
c = bintoasc[(((*radbuf<<4)&060)|((radbuf[1] >> 4)&017))&077];
|
||||
iobuf_put(a, c);
|
||||
c = bintoasc[(((radbuf[1]<<2)&074)|((radbuf[2]>>6)&03))&077];
|
||||
iobuf_put(a, c);
|
||||
c = bintoasc[radbuf[2]&077];
|
||||
iobuf_put(a, c);
|
||||
iobuf_put(a, '\n');
|
||||
/* and the the trailer */
|
||||
if( afx->what >= DIM(tail_strings) )
|
||||
log_bug("afx->what=%d", afx->what);
|
||||
iobuf_writestr(a, "-----");
|
||||
iobuf_writestr(a, tail_strings[afx->what] );
|
||||
iobuf_writestr(a, "-----\n");
|
||||
}
|
||||
}
|
||||
else if( control == IOBUFCTRL_DESC )
|
||||
*(char**)buf = "armor_filter";
|
||||
return rc;
|
||||
}
|
||||
|
||||
Loading…
Add table
Add a link
Reference in a new issue