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505 lines
12 KiB
C
505 lines
12 KiB
C
/* hkp.c - Horrowitz Keyserver Protocol
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* Copyright (C) 1998, 1999, 2000, 2001 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 2 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, 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 <ctype.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 "util.h"
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#include "ttyio.h"
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#include "i18n.h"
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#include "options.h"
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#include "filter.h"
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#include "http.h"
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#include "main.h"
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#include "keyserver-internal.h"
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static int urlencode_filter( void *opaque, int control,
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IOBUF a, byte *buf, size_t *ret_len);
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/****************
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* Try to import the key with KEYID from a keyserver but ask the user
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* before doing so.
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* Returns: 0 the key was successfully imported
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* -1 key not found on server or user does not want to
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* import the key
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* or other error codes.
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*/
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int
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hkp_ask_import( u32 *keyid, void *stats_handle)
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{
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struct http_context hd;
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char *request;
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int rc;
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unsigned int hflags = opt.honor_http_proxy? HTTP_FLAG_TRY_PROXY : 0;
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log_info(_("requesting key %08lX from HKP keyserver %s\n"),
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(ulong)keyid[1],opt.keyserver_host );
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request = m_alloc( strlen( opt.keyserver_host ) + 100 );
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/* hkp does not accept the long keyid - we should really write a
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* nicer one :-)
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* FIXME: request binary mode - need to pass no_armor mode
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* down to the import function. Marc told that there is such a
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* binary mode ... how?
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*/
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if(strcasecmp(opt.keyserver_scheme,"x-broken-hkp")==0)
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hflags |= HTTP_FLAG_NO_SHUTDOWN;
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sprintf(request,"x-hkp://%s%s%s/pks/lookup?op=get&search=0x%08lX",
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opt.keyserver_host,
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atoi(opt.keyserver_port)>0?":":"",
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atoi(opt.keyserver_port)>0?opt.keyserver_port:"",
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(ulong)keyid[1] );
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if(opt.keyserver_options.verbose>2)
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log_info("request is \"%s\"\n",request);
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rc = http_open_document( &hd, request, hflags );
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if( rc ) {
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log_info(_("can't get key from keyserver: %s\n"),
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rc == G10ERR_NETWORK? strerror(errno)
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: g10_errstr(rc) );
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}
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else {
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rc = import_keys_stream( hd.fp_read,
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opt.keyserver_options.fast_import,stats_handle);
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http_close( &hd );
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}
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m_free( request );
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return rc;
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}
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int
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hkp_export( STRLIST users )
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{
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int rc;
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armor_filter_context_t afx;
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IOBUF temp = iobuf_temp();
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struct http_context hd;
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char *request;
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unsigned int status;
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unsigned int hflags = opt.honor_http_proxy? HTTP_FLAG_TRY_PROXY : 0;
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iobuf_push_filter( temp, urlencode_filter, NULL );
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memset( &afx, 0, sizeof afx);
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afx.what = 1;
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iobuf_push_filter( temp, armor_filter, &afx );
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rc = export_pubkeys_stream( temp, users, 1 );
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if( rc == -1 ) {
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iobuf_close(temp);
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return 0;
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}
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iobuf_flush_temp( temp );
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request = m_alloc( strlen( opt.keyserver_host ) + 100 );
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if(strcasecmp(opt.keyserver_scheme,"x-broken-hkp")==0)
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hflags |= HTTP_FLAG_NO_SHUTDOWN;
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sprintf( request, "x-hkp://%s%s%s/pks/add",
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opt.keyserver_host,
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atoi(opt.keyserver_port)>0?":":"",
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atoi(opt.keyserver_port)>0?opt.keyserver_port:"");
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if(opt.keyserver_options.verbose>2)
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log_info("request is \"%s\"\n",request);
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rc = http_open( &hd, HTTP_REQ_POST, request , hflags );
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if( rc ) {
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log_error(_("can't connect to `%s': %s\n"),
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opt.keyserver_host,
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rc == G10ERR_NETWORK? strerror(errno)
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: g10_errstr(rc) );
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iobuf_close(temp);
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m_free( request );
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return rc;
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}
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sprintf( request, "Content-Length: %u\n",
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(unsigned)iobuf_get_temp_length(temp) + 9 );
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iobuf_writestr( hd.fp_write, request );
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m_free( request );
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http_start_data( &hd );
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iobuf_writestr( hd.fp_write, "keytext=" );
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iobuf_write( hd.fp_write, iobuf_get_temp_buffer(temp),
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iobuf_get_temp_length(temp) );
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iobuf_put( hd.fp_write, '\n' );
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iobuf_flush_temp( temp );
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iobuf_close(temp);
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rc = http_wait_response( &hd, &status );
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if( rc ) {
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log_error(_("error sending to `%s': %s\n"),
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opt.keyserver_host, g10_errstr(rc) );
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}
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else {
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#if 1
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if( opt.verbose ) {
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int c;
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while( (c=iobuf_get(hd.fp_read)) != EOF )
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if ( c >= 32 && c < 127 )
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putchar( c );
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else
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putchar ( '?' );
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}
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#endif
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if( (status/100) == 2 )
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log_info(_("success sending to `%s' (status=%u)\n"),
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opt.keyserver_host, status );
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else
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log_error(_("failed sending to `%s': status=%u\n"),
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opt.keyserver_host, status );
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}
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http_close( &hd );
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return rc;
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}
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static int
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urlencode_filter( void *opaque, int control,
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IOBUF a, byte *buf, size_t *ret_len)
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{
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size_t size = *ret_len;
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int rc=0;
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if( control == IOBUFCTRL_FLUSH ) {
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const byte *p;
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for(p=buf; size; p++, size-- ) {
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if( isalnum(*p) || *p == '-' )
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iobuf_put( a, *p );
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else if( *p == ' ' )
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iobuf_put( a, '+' );
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else {
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char numbuf[5];
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sprintf(numbuf, "%%%02X", *p );
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iobuf_writestr(a, numbuf );
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}
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}
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}
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else if( control == IOBUFCTRL_DESC )
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*(char**)buf = "urlencode_filter";
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return rc;
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}
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/* pub 2048/<a href="/pks/lookup?op=get&search=0x3CB3B415">3CB3B415</a> 1998/04/03 David M. Shaw <<a href="/pks/lookup?op=get&search=0x3CB3B415">dshaw@jabberwocky.com</a>> */
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/* Luckily enough, both the HKP server and NAI HKP interface to their
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LDAP server are close enough in output so the same function can
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parse them both. */
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static int
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parse_hkp_index(IOBUF buffer,char *line)
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{
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static int open=0,revoked=0;
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static char *key;
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static unsigned char *uid;
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static u32 bits,createtime;
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int ret=0;
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/* printf("Open %d, LINE: %s\n",open,line); */
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/* For multiple UIDs */
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if(open && uid!=NULL)
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{
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ret=0;
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if(!(revoked && !opt.keyserver_options.include_revoked))
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{
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char intstr[11];
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iobuf_writestr(buffer,key);
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iobuf_writestr(buffer,":");
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iobuf_writestr(buffer,uid);
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iobuf_writestr(buffer,":");
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iobuf_writestr(buffer,revoked?"1:":":");
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sprintf(intstr,"%u",createtime);
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iobuf_writestr(buffer,intstr);
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iobuf_writestr(buffer,"::::");
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sprintf(intstr,"%u",bits);
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iobuf_writestr(buffer,intstr);
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iobuf_writestr(buffer,"\n");
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ret=1;
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}
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if(strncmp(line," ",5)!=0)
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{
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m_free(key);
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m_free(uid);
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uid=NULL;
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open=0;
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}
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}
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if(strncasecmp(line,"pub ",5)==0)
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{
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char *tok,*temp;
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open=1;
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line+=4;
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tok=strsep(&line,"/");
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if(tok==NULL)
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return ret;
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bits=atoi(tok);
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tok=strsep(&line,">");
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if(tok==NULL)
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return ret;
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tok=strsep(&line,"<");
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if(tok==NULL)
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return ret;
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key=m_strdup(tok);
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tok=strsep(&line," ");
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if(tok==NULL)
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return ret;
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tok=strsep(&line," ");
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if(tok==NULL)
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return ret;
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/* The date parser wants '-' instead of '/', so... */
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temp=tok;
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while(*temp!='\0')
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{
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if(*temp=='/')
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*temp='-';
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temp++;
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}
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createtime=scan_isodatestr(tok);
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}
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if(open)
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{
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int uidindex=0;
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/* All that's left is the user name. Strip off anything
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<between brackets> and de-urlencode it. */
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while(*line==' ' && *line!='\0')
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line++;
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if(strncmp(line,"*** KEY REVOKED ***",19)==0)
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{
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revoked=1;
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return ret;
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}
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uid=m_alloc(strlen(line)+1);
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while(*line!='\0')
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{
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switch(*line)
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{
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case '<':
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while(*line!='>' && *line!='\0')
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line++;
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if(*line!='\0')
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line++;
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break;
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case '&':
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if((*(line+1)!='\0' && tolower(*(line+1))=='l') &&
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(*(line+2)!='\0' && tolower(*(line+2))=='t') &&
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(*(line+3)!='\0' && *(line+3)==';'))
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{
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uid[uidindex++]='<';
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line+=4;
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break;
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}
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if((*(line+1)!='\0' && tolower(*(line+1))=='g') &&
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(*(line+2)!='\0' && tolower(*(line+2))=='t') &&
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(*(line+3)!='\0' && *(line+3)==';'))
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{
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uid[uidindex++]='>';
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line+=4;
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break;
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}
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default:
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uid[uidindex++]=*line;
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line++;
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break;
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}
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}
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uid[uidindex]='\0';
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/* Chop off the trailing \r, \n, or both. This is fussy as the
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true HKP servers have \r\n, and the NAI HKP servers have just
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\n. */
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if(isspace(uid[uidindex-1]))
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uid[uidindex-1]='\0';
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if(isspace(uid[uidindex-2]))
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uid[uidindex-2]='\0';
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}
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return ret;
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}
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int hkp_search(STRLIST tokens)
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{
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int rc=0,len=0,first=1;
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unsigned int maxlen=1024,buflen=0;
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unsigned char *searchstr=NULL,*searchurl=NULL;
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unsigned char *request;
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struct http_context hd;
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unsigned int hflags=opt.honor_http_proxy?HTTP_FLAG_TRY_PROXY:0;
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byte *line=NULL;
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/* Glue the tokens together to make a search string */
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for(;tokens;tokens=tokens->next)
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{
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len+=strlen(tokens->d)+1;
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searchstr=m_realloc(searchstr,len+1);
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if(first)
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{
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searchstr[0]='\0';
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first=0;
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}
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strcat(searchstr,tokens->d);
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strcat(searchstr," ");
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}
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if(len<=1)
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{
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m_free(searchstr);
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return 0;
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}
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searchstr[len-1]='\0';
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log_info(_("searching for \"%s\" from HKP server %s\n"),
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searchstr,opt.keyserver_host);
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/* Now make it url-ish */
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len=0;
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request=searchstr;
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while(*request!='\0')
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{
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if(isalnum(*request) || *request=='-')
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{
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searchurl=m_realloc(searchurl,len+1);
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searchurl[len++]=*request;
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}
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else if(*request==' ')
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{
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searchurl=m_realloc(searchurl,len+1);
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searchurl[len++]='+';
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}
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else
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{
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searchurl=m_realloc(searchurl,len+3);
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sprintf(&searchurl[len],"%%%02X",*request);
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len+=3;
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}
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request++;
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}
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searchurl=m_realloc(searchurl,len+1);
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searchurl[len]='\0';
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request=m_alloc(strlen(opt.keyserver_host) + 100 + strlen(searchurl));
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if(strcasecmp(opt.keyserver_scheme,"x-broken-hkp")==0)
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hflags |= HTTP_FLAG_NO_SHUTDOWN;
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sprintf(request,"x-hkp://%s%s%s/pks/lookup?op=index&search=%s",
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opt.keyserver_host,
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atoi(opt.keyserver_port)>0?":":"",
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atoi(opt.keyserver_port)>0?opt.keyserver_port:"",
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searchurl);
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if(opt.keyserver_options.verbose>2)
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log_info("request is \"%s\"\n",request);
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rc=http_open_document(&hd,request,hflags);
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if(rc)
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{
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log_error(_("can't search keyserver: %s\n"),
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rc==G10ERR_NETWORK?strerror(errno):g10_errstr(rc));
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}
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else
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{
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IOBUF buffer;
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int count=1;
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buffer=iobuf_temp();
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rc=1;
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while(rc!=0)
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{
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/* This is a judgement call. Is it better to slurp up all
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the results before prompting the user? On the one hand,
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it probably makes the keyserver happier to not be blocked
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on sending for a long time while the user picks a key.
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On the other hand, it might be nice for the server to be
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able to stop sending before a large search result page is
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complete. */
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rc=iobuf_read_line(hd.fp_read,&line,&buflen,&maxlen);
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if(rc!=0)
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count+=parse_hkp_index(buffer,line);
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}
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http_close(&hd);
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count--;
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keyserver_search_prompt(buffer,count,searchstr);
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iobuf_close(buffer);
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m_free(line);
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}
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m_free(request);
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m_free(searchurl);
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m_free(searchstr);
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return rc;
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}
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