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armor.c
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	/* armor.c - Armor filter
	* Copyright (c) 1997 by Werner Koch (dd9jn)
	*
	* This file is part of G10.
	*
	* G10 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 2 of the License, or
	* (at your option) any later version.
	*
	* G10 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, write to the Free Software
	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
	*/

	#include <config.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <errno.h>
	#include <assert.h>

	#include "errors.h"
	#include "iobuf.h"
	#include "memory.h"
	#include "util.h"
	#include "filter.h"
	#include "packet.h"
	#include "options.h"




	#define CRCINIT 0xB704CE
	#define CRCPOLY 0X864CFB
	#define CRCUPDATE(a,c) do { \
	a = ((a) << 8) ^ crc_table[((a)&0xff >> 16) ^ (c)]; \
	a &= 0x00ffffff; \
	} while(0)
	static u32 crc_table[256];
	static byte bintoasc[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
	"abcdefghijklmnopqrstuvwxyz"
	"0123456789+/";
	static byte asctobin[256]; /* runtime initialized */
	static int is_initialized;


	typedef enum {
	fhdrHASArmor,
	fhdrNOArmor,
	fhdrINIT,
	fhdrINITCont,
	fhdrINITSkip,
	fhdrCHECKBegin,
	fhdrWAITHeader,
	fhdrWAITClearsig,
	fhdrSKIPHeader,
	fhdrCLEARSIG,
	fhdrREADClearsig,
	fhdrEMPTYClearsig,
	fhdrCHECKClearsig,
	fhdrCHECKClearsig2,
	fhdrREADClearsigNext,
	fhdrENDClearsig,
	fhdrTEXT,
	fhdrERROR,
	fhdrERRORShow,
	fhdrEOF
	} fhdr_state_t;


	/* if we encounter this armor string with this index, go
	* into a mode, which fakes packets and wait for the next armor */
	#define BEGIN_SIGNED_MSG_IDX 3
	static char *head_strings[] = {
	"BEGIN PGP MESSAGE",
	"BEGIN PGP PUBLIC KEY BLOCK",
	"BEGIN PGP SIGNATURE",
	"BEGIN PGP SIGNED MESSAGE",
	NULL
	};
	static char *tail_strings[] = {
	"END PGP MESSAGE",
	"END PGP PUBLIC KEY BLOCK",
	"END PGP SIGNATURE",
	NULL
	};


	static fhdr_state_t find_header( fhdr_state_t state,
	byte buf, size_t r_buflen, IOBUF a, size_t n);


	static void
	initialize(void)
	{
	int i, j;
	u32 t;
	byte *s;

	/* init the crc lookup table */
	crc_table[0] = 0;
	for(i=j=0; j < 128; j++ ) {
	t = crc_table[j];
	if( t & 0x00800000 ) {
	t <<= 1;
	crc_table[i++] = t ^ CRCPOLY;
	crc_table[i++] = t;
	}
	else {
	t <<= 1;
	crc_table[i++] = t;
	crc_table[i++] = t ^ CRCPOLY;
	}
	}
	/* build the helptable for radix64 to bin conversion */
	for(i=0; i < 256; i++ )
	asctobin[i] = 255; /* used to detect invalid characters */
	for(s=bintoasc,i=0; *s; s++,i++ )
	asctobin[*s] = i;

	is_initialized=1;
	}

	/****************
	* Check wether this is a armored file or not
	* See also parse-packet.c for details on this code
	* Returns: True if it seems to be armored
	*/
	static int
	is_armored( byte *buf )
	{
	int ctb, pkttype;

	ctb = *buf;
	if( !(ctb & 0x80) )
	return 1; /* invalid packet: assume it is armored */
	pkttype = ctb & 0x40 ? (ctb & 0x3f) : ((ctb>>2)&0xf);
	switch( pkttype ) {
	case PKT_PUBLIC_CERT:
	case PKT_SECRET_CERT:
	case PKT_PUBKEY_ENC:
	case PKT_SIGNATURE:
	case PKT_COMMENT:
	case PKT_PLAINTEXT:
	case PKT_COMPRESSED:
	case PKT_ENCRYPTED:
	return 0; /* seems to be a regular packet: not armored */
	}

	return 1;
	}


	/****************
	* parse an ascii armor.
	* Returns: the state,
	* the remaining bytes in BUF are returned in RBUFLEN.
	*/
	static fhdr_state_t
	find_header( fhdr_state_t state, byte buf, size_t r_buflen, IOBUF a, size_t n)
	{
	int c, i;
	const char *s;
	char *p;
	size_t buflen;
	int cont;
	int clearsig=0;
	int hdr_line=0;

	buflen = *r_buflen;
	assert(buflen >= 100 );
	buflen--;

	do {
	switch( state ) {
	case fhdrHASArmor:
	/* read 28 bytes, which is the bare minimum for a BEGIN...
	* and check wether this has a Armor. */
	c = 0;
	for(n=0; n < 28 && (c=iobuf_get(a)) != -1 && c != '\n'; )
	buf[n++] = c;
	if( n < 28 \|\| c == -1 )
	state = fhdrNOArmor; /* too short */
	else if( !is_armored( buf ) )
	state = fhdrNOArmor;
	else
	state = fhdrINITCont;
	break;

	case fhdrINIT: /* read some stuff into buffer */
	n = 0;
	case fhdrINITCont: /* read more stuff into buffer */
	c = 0;
	for(; n < buflen && (c=iobuf_get(a)) != -1 && c != '\n'; )
	buf[n++] = c;
	state = c == '\n' ? fhdrCHECKBegin :
	c == -1 ? fhdrEOF : fhdrINITSkip;
	break;

	case fhdrINITSkip:
	while( (c=iobuf_get(a)) != -1 && c != '\n' )
	;
	state = c == -1? fhdrEOF : fhdrINIT;
	break;

	case fhdrSKIPHeader:
	while( (c=iobuf_get(a)) != -1 && c != '\n' )
	;
	state = c == -1? fhdrEOF : fhdrWAITHeader;
	break;

	case fhdrWAITHeader: /* wait for Header lines */
	c = 0;
	for(n=0; n < buflen && (c=iobuf_get(a)) != -1 && c != '\n'; )
	buf[n++] = c;
	buf[n] = 0;
	if( n < buflen \|\| c == '\n' ) {
	if( n && buf[0] != '\r') { /* maybe a header */
	if( strchr( buf, ':') ) { /* yes */
	log_debug("armor header: ");
	print_string( stderr, buf, n );
	putc('\n', stderr);
	state = fhdrWAITHeader;
	}
	else
	state = fhdrTEXT;
	}
	else if( !n \|\| (buf[0] == '\r' && !buf[1]) ) { /* empty line */
	if( clearsig )
	state = fhdrWAITClearsig;
	else {
	/* this is not really correct: if we do not have
	* a clearsig and not armor lines we are not allowed
	* to have an empty line */
	n = 0;
	state = fhdrTEXT;
	}
	}
	else {
	log_debug("invalid armor header: ");
	print_string( stderr, buf, n );
	putc('\n', stderr);
	state = fhdrERROR;
	}
	}
	else if( c != -1 ) {
	if( strchr( buf, ':') ) { /* buffer to short, but this is okay*/
	log_debug("armor header: ");
	print_string( stderr, buf, n );
	fputs("[...]\n", stderr); /* indicate it is truncated */
	state = fhdrSKIPHeader; /* skip rest of line */
	}
	else /* line too long */
	state = fhdrERROR;
	}
	else
	state = fhdrEOF;
	break;

	case fhdrWAITClearsig: /* skip all empty lines (for clearsig) */
	c = 0;
	for(n=0; n < buflen && (c=iobuf_get(a)) != -1 && c != '\n'; )
	buf[n++] = c;
	if( n < buflen \|\| c == '\n' ) {
	buf[n] = 0;
	if( !n \|\| (buf[0]=='\r' && !buf[1]) ) /* empty line */
	;
	else
	state = fhdrTEXT;
	}
	else
	state = fhdrEOF;
	break;

	case fhdrENDClearsig:
	case fhdrCHECKBegin:
	state = state == fhdrCHECKBegin ? fhdrINITSkip : fhdrERRORShow;
	if( n < 15 )
	break; /* too short */
	if( memcmp( buf, "-----", 5 ) )
	break;
	buf[n] = 0;
	p = strstr(buf+5, "-----");
	if( !p )
	break;
	*p = 0;
	p += 5;
	if( *p == '\r' )
	p++;
	if( *p )
	break; /* garbage after dashes */
	p = buf+5;
	for(i=0; (s=head_strings[i]); i++ )
	if( !strcmp(s, p) )
	break;
	if( !s )
	break; /* unknown begin line */
	/* found the begin line */
	hdr_line = i;
	state = fhdrWAITHeader;
	if( hdr_line == BEGIN_SIGNED_MSG_IDX )
	clearsig = 1;
	log_debug("armor: %s\n", head_strings[hdr_line]);
	break;

	case fhdrCLEARSIG:
	case fhdrEMPTYClearsig:
	case fhdrREADClearsig:
	/* we are at the start of a line: read a clearsig into the buffer
	* we have to look for a the header line or dashd escaped text*/
	n = 0;
	c = 0;
	for(; n < buflen && (c=iobuf_get(a)) != -1 && c != '\n'; )
	buf[n++] = c;
	buf[n] = 0;
	if( c == -1 )
	state = fhdrEOF;
	else if( !n \|\| ( buf[0]=='\r' && !buf[1] ) ) {
	state = fhdrEMPTYClearsig;
	/* FIXME: handle it */
	}
	else if( c == '\n' )
	state = fhdrCHECKClearsig2;
	else
	state = fhdrCHECKClearsig;
	break;

	case fhdrCHECKClearsig:
	case fhdrCHECKClearsig2:
	/* check the clearsig line */
	if( n > 15 && !memcmp(buf, "-----", 5 ) )
	state = fhdrENDClearsig;
	else if( buf[0] == '-' && buf[1] == ' ' ) {
	/* dash escaped line */
	if( buf[2] == '-' \|\| ( n > 6 && !memcmp(buf+2, "From ", 5))) {
	for(i=2; i < n; i++ )
	buf[i-2] = buf[i];
	n -= 2;
	buf[n] = 0; /* not really needed */
	state = state == fhdrCHECKClearsig2 ?
	fhdrREADClearsig : fhdrREADClearsigNext;
	/* FIXME: add the lf to the buffer */
	}
	else {
	log_debug("invalid dash escaped line: ");
	print_string( stderr, buf, n );
	putc('\n', stderr);
	state = fhdrERROR;
	}
	}
	else {
	state = state == fhdrCHECKClearsig2 ?
	fhdrREADClearsig : fhdrREADClearsigNext;
	/* FIXME: add the lf to the buffer */
	}
	break;

	case fhdrREADClearsigNext:
	/* Read to the end of the line, do not care about checking
	* for dashed escaped text of headers */
	break;

	case fhdrERRORShow:
	log_debug("invalid clear text header: ");
	print_string( stderr, buf, n );
	putc('\n', stderr);
	state = fhdrERROR;
	break;

	default: BUG();
	}
	switch( state ) {
	case fhdrINIT:
	case fhdrINITCont:
	case fhdrINITSkip:
	case fhdrCHECKBegin:
	case fhdrWAITHeader:
	case fhdrWAITClearsig:
	case fhdrSKIPHeader:
	case fhdrEMPTYClearsig:
	case fhdrCHECKClearsig:
	case fhdrCHECKClearsig2:
	case fhdrERRORShow:
	cont = 1;
	break;
	default: cont = 0;
	}
	} while( cont );

	if( clearsig && state == fhdrTEXT )
	state = fhdrCLEARSIG;
	*r_buflen = n;
	return state;
	}


	/* figure out wether the data is armored or not */
	static int
	check_input( armor_filter_context_t *afx, IOBUF a )
	{
	int rc = 0;
	size_t n;
	fhdr_state_t state = afx->parse_state;

	if( state != fhdrENDClearsig )
	state = fhdrHASArmor;

	n = DIM(afx->helpbuf);
	state = find_header( state, afx->helpbuf, &n, a, afx->helplen );
	switch( state ) {
	case fhdrNOArmor:
	afx->inp_checked = 1;
	afx->inp_bypass = 1;
	afx->helplen = n;
	break;

	case fhdrERROR:
	case fhdrEOF:
	rc = -1;
	break;

	case fhdrCLEARSIG: /* start fake package mode (for clear signatures) */
	afx->helplen = n;
	afx->helpidx = 0;
	afx->faked = 1;
	break;

	case fhdrTEXT:
	afx->helplen = n;
	afx->helpidx = 0;
	afx->inp_checked = 1;
	afx->crc = CRCINIT;
	afx->idx = 0;
	afx->radbuf[0] = 0;
	break;

	default: BUG();
	}

	afx->parse_state = state;
	return rc;
	}



	/* fake a literal data packet and wait for an armor line */
	static int
	fake_packet( armor_filter_context_t *afx, IOBUF a,
	size_t retn, byte buf, size_t size )
	{
	int rc = 0;
	size_t len = 0;
	size_t n, nn;
	fhdr_state_t state = afx->parse_state;

	size = 100; /* FIXME: only used for testing (remove it) */

	len = 2; /* reserve 2 bytes for the length header */
	size -= 2; /* and 2 for the term header */
	while( !rc && len < size ) {
	if( afx->helpidx < afx->helplen ) { /* flush the last buffer */
	n = afx->helplen;
	for(nn=afx->helpidx; len < size && nn < n ; nn++ )
	buf[len++] = afx->helpbuf[nn];
	afx->helpidx = nn;
	continue;
	}
	if( state == fhdrEOF ) {
	rc = -1;
	continue;
	}
	/* read a new one */
	n = DIM(afx->helpbuf);
	afx->helpidx = 0;
	state = find_header( state, afx->helpbuf, &n, a, 0 );
	switch( state) {
	case fhdrERROR:
	case fhdrEOF:
	rc = -1;
	break;

	case fhdrCLEARSIG:
	case fhdrREADClearsig:
	case fhdrREADClearsigNext:
	afx->helplen = n;
	break;

	case fhdrENDClearsig:
	afx->helplen = n;
	afx->faked = 0;
	rc = -1;
	break;

	default: BUG();
	}
	}
	buf[0] = (len-2) >> 8;
	buf[1] = (len-2);
	if( state == fhdrENDClearsig ) { /* write last (ending) length header */
	buf[len++] = 0;
	buf[len++] = 0;
	rc = 0;
	}

	afx->parse_state = state;
	*retn = len;
	return rc;
	}



	static int
	radix64_read( armor_filter_context_t afx, IOBUF a, size_t retn,
	byte *buf, size_t size )
	{
	byte val;
	int c, c2;
	int checkcrc=0;
	int rc = 0;
	size_t n = 0;
	int idx, i;
	u32 crc;

	crc = afx->crc;
	idx = afx->idx;
	val = afx->radbuf[0];
	for( n=0; n < size; ) {
	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' )
	continue;
	else if( c == '=' ) { /* pad character: stop */
	if( idx == 1 )
	buf[n++] = val;
	checkcrc++;
	break;
	}
	else if( (c = asctobin[(c2=c)]) == 255 ) {
	log_error("invalid radix64 character %02x skipped\n", c2);
	continue;
	}
	switch(idx) {
	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;
	case 3: val \|= c&0x3f; buf[n++] = val; break;
	}
	idx = (idx+1) % 4;
	}
	for(i=0; i < n; i++ )
	crc = (crc << 8) ^ crc_table[((crc >> 16)&0xff) ^ buf[i]];
	crc &= 0x00ffffff;
	afx->crc = crc;
	afx->idx = idx;
	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 )
	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 {
	for(rc=0;!rc;) {
	rc = 0 /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;
	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 )
	BUG(); /* 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->faked )
	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->faked ) {
	/* 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;
	}

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