mirror of
git://git.gnupg.org/gnupg.git
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819 lines
21 KiB
C
819 lines
21 KiB
C
/* passphrase.c - Get a passphrase
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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 <stddef.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 <unistd.h>
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#include <assert.h>
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#if !defined(HAVE_DOSISH_SYSTEM) && !defined(__riscos__)
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#include <sys/socket.h>
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#include <sys/un.h>
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#endif
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#ifdef __MINGW32__
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# include <windows.h>
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#endif
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#include <errno.h>
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#include "util.h"
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#include "memory.h"
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#include "options.h"
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#include "ttyio.h"
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#include "cipher.h"
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#include "keydb.h"
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#include "main.h"
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#include "i18n.h"
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#include "status.h"
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enum gpga_protocol_codes {
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/* Request codes */
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GPGA_PROT_GET_VERSION = 1,
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GPGA_PROT_GET_PASSPHRASE = 2,
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GPGA_PROT_CLEAR_PASSPHRASE= 3,
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GPGA_PROT_SHUTDOWN = 4,
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GPGA_PROT_FLUSH = 5,
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/* Reply codes */
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GPGA_PROT_REPLY_BASE = 0x10000,
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GPGA_PROT_OKAY = 0x10001,
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GPGA_PROT_GOT_PASSPHRASE = 0x10002,
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/* Error codes */
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GPGA_PROT_ERROR_BASE = 0x20000,
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GPGA_PROT_PROTOCOL_ERROR = 0x20001,
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GPGA_PROT_INVALID_REQUEST= 0x20002,
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GPGA_PROT_CANCELED = 0x20003,
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GPGA_PROT_NO_PASSPHRASE = 0x20004,
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GPGA_PROT_BAD_PASSPHRASE = 0x20005,
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GPGA_PROT_INVALID_DATA = 0x20006,
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GPGA_PROT_NOT_IMPLEMENTED= 0x20007,
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GPGA_PROT_UI_PROBLEM = 0x20008
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};
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#define buftou32( p ) ((*(byte*)(p) << 24) | (*((byte*)(p)+1)<< 16) | \
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(*((byte*)(p)+2) << 8) | (*((byte*)(p)+3)))
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#define u32tobuf( p, a ) do { \
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((byte*)p)[0] = (byte)((a) >> 24); \
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((byte*)p)[1] = (byte)((a) >> 16); \
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((byte*)p)[2] = (byte)((a) >> 8); \
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((byte*)p)[3] = (byte)((a) ); \
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} while(0)
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static char *fd_passwd = NULL;
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static char *next_pw = NULL;
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static char *last_pw = NULL;
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#ifdef __MINGW32__
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static int read_fd = 0;
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static int write_fd = 0;
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#endif
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static void hash_passphrase( DEK *dek, char *pw, STRING2KEY *s2k, int create );
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int
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have_static_passphrase()
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{
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if ( opt.use_agent )
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return 0;
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return !!fd_passwd;
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}
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/****************
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* Set the passphrase to be used for the next query and only for the next
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* one.
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*/
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void
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set_next_passphrase( const char *s )
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{
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m_free(next_pw);
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next_pw = NULL;
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if( s ) {
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next_pw = m_alloc_secure( strlen(s)+1 );
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strcpy(next_pw, s );
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}
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}
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/****************
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* Get the last passphrase used in passphrase_to_dek.
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* Note: This removes the passphrase from this modules and
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* the caller must free the result. May return NULL:
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*/
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char *
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get_last_passphrase()
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{
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char *p = last_pw;
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last_pw = NULL;
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return p;
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}
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void
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read_passphrase_from_fd( int fd )
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{
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int i, len;
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char *pw;
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if ( opt.use_agent )
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return; /* not used here */
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if( !opt.batch )
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tty_printf("Reading passphrase from file descriptor %d ...", fd );
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for( pw = NULL, i = len = 100; ; i++ ) {
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if( i >= len-1 ) {
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char *pw2 = pw;
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len += 100;
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pw = m_alloc_secure( len );
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if( pw2 )
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memcpy(pw, pw2, i );
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else
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i=0;
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}
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if( read( fd, pw+i, 1) != 1 || pw[i] == '\n' )
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break;
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}
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pw[i] = 0;
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if( !opt.batch )
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tty_printf("\b\b\b \n" );
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m_free( fd_passwd );
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fd_passwd = pw;
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}
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static int
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writen ( int fd, const void *buf, size_t nbytes )
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{
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#ifdef __MINGW32__
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DWORD nwritten, nleft = nbytes;
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while (nleft > 0) {
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if ( !WriteFile( (HANDLE)write_fd, buf, nleft, &nwritten, NULL) ) {
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log_error("write failed: ec=%d\n", (int)GetLastError());
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return -1;
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}
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/*log_info("** WriteFile fd=%d nytes=%d nwritten=%d\n",
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write_fd, nbytes, (int)nwritten);*/
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Sleep(100);
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nleft -= nwritten;
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buf = (const BYTE *)buf + nwritten;
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}
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#elif defined(HAVE_DOSISH_SYSTEM) || defined(__riscos__)
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/* not implemented */
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#else
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size_t nleft = nbytes;
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int nwritten;
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while( nleft > 0 ) {
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nwritten = write( fd, buf, nleft );
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if( nwritten < 0 ) {
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if ( errno == EINTR )
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nwritten = 0;
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else {
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log_error ( "write() failed: %s\n", strerror (errno) );
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return -1;
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}
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}
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nleft -= nwritten;
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buf = (const char*)buf + nwritten;
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}
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#endif
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return 0;
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}
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static int
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readn ( int fd, void *buf, size_t buflen, size_t *ret_nread )
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{
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#ifdef __MINGW32__
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DWORD nread, nleft = buflen;
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while (nleft > 0) {
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if ( !ReadFile( (HANDLE)read_fd, buf, nleft, &nread, NULL) ) {
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log_error("read() error: ec=%d\n", (int)GetLastError());
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return -1;
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}
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if (!nread || GetLastError() == ERROR_BROKEN_PIPE)
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break;
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/*log_info("** ReadFile fd=%d buflen=%d nread=%d\n",
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read_fd, buflen, (int)nread);*/
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Sleep(100);
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nleft -= nread;
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buf = (BYTE *)buf + nread;
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}
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if (ret_nread)
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*ret_nread = buflen - nleft;
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#elif defined(HAVE_DOSISH_SYSTEM) || defined(__riscos__)
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/* not implemented */
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#else
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size_t nleft = buflen;
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int nread;
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char *p;
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p = buf;
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while( nleft > 0 ) {
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nread = read ( fd, buf, nleft );
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if( nread < 0 ) {
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if (nread == EINTR)
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nread = 0;
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else {
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log_error ( "read() error: %s\n", strerror (errno) );
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return -1;
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}
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}
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else if( !nread )
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break; /* EOF */
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nleft -= nread;
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buf = (char*)buf + nread;
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}
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if( ret_nread )
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*ret_nread = buflen - nleft;
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#endif
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return 0;
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}
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#if !defined (__riscos__)
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/*
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* Open a connection to the agent and send the magic string
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* Returns: -1 on error or an filedescriptor for urther processing
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*/
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static int
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agent_open (void)
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{
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#ifdef __MINGW32__
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int fd;
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char *infostr, *p;
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HANDLE h;
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char pidstr[128];
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if ( !(infostr = read_w32_registry_string(NULL, "Software\\GNU\\GnuPG",
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"agentPID"))
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|| *infostr == '0') {
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log_error( _("gpg-agent is not available in this session\n"));
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return -1;
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}
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free(infostr);
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sprintf(pidstr, "%u", (unsigned int)GetCurrentProcessId());
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if (write_w32_registry_string(NULL, "Software\\GNU\\GnuPG",
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"agentCID", pidstr)) {
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log_error( _("can't set client pid for the agent\n") );
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return -1;
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}
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h = OpenEvent(EVENT_ALL_ACCESS, FALSE, "gpg_agent");
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SetEvent(h);
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Sleep(50); /* some time for the server */
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if ( !(p = read_w32_registry_string(NULL, "Software\\GNU\\GnuPG",
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"agentReadFD")) ) {
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log_error( _("can't get server read FD for the agent\n") );
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return -1;
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}
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read_fd = atol(p);
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free(p);
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if ( !(p = read_w32_registry_string(NULL, "Software\\GNU\\GnuPG",
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"agentWriteFD")) ) {
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log_error ( _("can't get server write FD for the agent\n") );
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return -1;
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}
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write_fd = atol(p);
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free(p);
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fd = 0;
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if ( writen ( fd, "GPGA\0\0\0\x01", 8 ) ) {
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fd = -1;
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}
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#else /* Posix */
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int fd;
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char *infostr, *p;
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struct sockaddr_un client_addr;
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size_t len;
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infostr = getenv ( "GPG_AGENT_INFO" );
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if ( !infostr ) {
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log_error (_("gpg-agent is not available in this session\n"));
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return -1;
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}
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infostr = m_strdup ( infostr );
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if ( !(p = strchr ( infostr, ':')) || p == infostr
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|| (p-infostr)+1 >= sizeof client_addr.sun_path ) {
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log_error( _("malformed GPG_AGENT_INFO environment variable\n"));
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m_free (infostr );
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return -1;
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}
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*p = 0;
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if( (fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1 ) {
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log_error ("can't create socket: %s\n", strerror(errno) );
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m_free (infostr );
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return -1;
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}
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memset( &client_addr, 0, sizeof client_addr );
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client_addr.sun_family = AF_UNIX;
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strcpy( client_addr.sun_path, infostr );
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len = offsetof (struct sockaddr_un, sun_path)
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+ strlen(client_addr.sun_path) + 1;
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if( connect( fd, (struct sockaddr*)&client_addr, len ) == -1 ) {
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log_error ( _("can't connect to `%s': %s\n"),
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infostr, strerror (errno) );
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m_free (infostr );
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close (fd );
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return -1;
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}
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m_free (infostr);
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if ( writen ( fd, "GPGA\0\0\0\x01", 8 ) ) {
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close (fd);
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fd = -1;
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}
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#endif
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return fd;
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}
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static void
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agent_close ( int fd )
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{
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#ifdef __MINGW32__
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HANDLE h = OpenEvent(EVENT_ALL_ACCESS, FALSE, "gpg_agent");
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ResetEvent(h);
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#else
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close (fd);
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#endif
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}
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#endif /* !__riscos__ */
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/*
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* Ask the GPG Agent for the passphrase.
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* Mode 0: Allow cached passphrase
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* 1: No cached passphrase FIXME: Not really implemented
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* 2: Ditto, but change the text to "repeat entry"
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*/
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static char *
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agent_get_passphrase ( u32 *keyid, int mode )
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{
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#if defined(__riscos__)
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return NULL;
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#else
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size_t n;
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char *atext;
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char buf[50];
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int fd = -1;
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int nread;
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u32 reply;
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char *pw = NULL;
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PKT_public_key *pk = m_alloc_clear( sizeof *pk );
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byte fpr[MAX_FINGERPRINT_LEN];
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#if MAX_FINGERPRINT_LEN < 20
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#error agent needs a 20 byte fingerprint
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#endif
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memset (fpr, 0, MAX_FINGERPRINT_LEN );
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if( keyid && get_pubkey( pk, keyid ) )
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pk = NULL; /* oops: no key for some reason */
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if ( !mode && pk ) {
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char *uid;
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size_t uidlen;
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const char *algo_name = pubkey_algo_to_string ( pk->pubkey_algo );
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const char *timestr;
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char *maink;
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const char *fmtstr;
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if ( !algo_name )
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algo_name = "?";
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fmtstr = _(" (main key ID %08lX)");
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maink = m_alloc ( strlen (fmtstr) + 20 );
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if( keyid[2] && keyid[3] && keyid[0] != keyid[2]
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&& keyid[1] != keyid[3] )
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sprintf( maink, fmtstr, (ulong)keyid[3] );
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else
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*maink = 0;
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uid = get_user_id( keyid, &uidlen );
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timestr = strtimestamp (pk->timestamp);
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fmtstr = _("You need a passphrase to unlock the"
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" secret key for user:\n"
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"\"%.*s\"\n"
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"%u-bit %s key, ID %08lX, created %s%s\n" );
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atext = m_alloc ( 100 + strlen (fmtstr)
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+ uidlen + 15 + strlen(algo_name) + 8
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+ strlen (timestr) + strlen (maink) );
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sprintf (atext, fmtstr,
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uidlen, uid,
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nbits_from_pk (pk), algo_name, (ulong)keyid[1], timestr,
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maink );
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m_free (uid);
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m_free (maink);
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{
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size_t dummy;
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fingerprint_from_pk( pk, fpr, &dummy );
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}
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}
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else if (mode == 1 )
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atext = m_strdup ( _("Enter passphrase\n") );
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else
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atext = m_strdup ( _("Repeat passphrase\n") );
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|
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if ( (fd = agent_open ()) == -1 )
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goto failure;
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|
|
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n = 4 + 20 + strlen (atext);
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u32tobuf (buf, n );
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u32tobuf (buf+4, GPGA_PROT_GET_PASSPHRASE );
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memcpy (buf+8, fpr, 20 );
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if ( writen ( fd, buf, 28 ) || writen ( fd, atext, strlen (atext) ) )
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goto failure;
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m_free (atext); atext = NULL;
|
|
|
|
/* get response */
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if ( readn ( fd, buf, 12, &nread ) )
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goto failure;
|
|
|
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if ( nread < 8 ) {
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log_error ( "response from agent too short\n" );
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goto failure;
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}
|
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n = buftou32 ( buf );
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reply = buftou32 ( buf + 4 );
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if ( reply == GPGA_PROT_GOT_PASSPHRASE ) {
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size_t pwlen;
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size_t nn;
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|
|
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if ( nread < 12 || n < 8 ) {
|
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log_error ( "response from agent too short\n" );
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goto failure;
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}
|
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pwlen = buftou32 ( buf + 8 );
|
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nread -= 12;
|
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n -= 8;
|
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if ( pwlen > n || n > 1000 ) {
|
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log_error (_("passphrase too long\n"));
|
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/* or protocol error */
|
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goto failure;
|
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}
|
|
/* we read the whole block in one chunk to give no hints
|
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* on how long the passhrase actually is - this wastes some bytes
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* but because we already have this padding we should not loosen
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* this by issuing 2 read calls */
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pw = m_alloc_secure ( n+1 );
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if ( readn ( fd, pw, n, &nn ) )
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goto failure;
|
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if ( n != nn ) {
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log_error (_("invalid response from agent\n"));
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goto failure;
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}
|
|
pw[pwlen] = 0; /* make a C String */
|
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agent_close (fd);
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free_public_key( pk );
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return pw;
|
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}
|
|
else if ( reply == GPGA_PROT_CANCELED ) {
|
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log_info ( _("cancelled by user\n") );
|
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}
|
|
else {
|
|
log_error ( _("problem with the agent: agent returns 0x%lx\n"),
|
|
(ulong)reply );
|
|
}
|
|
|
|
|
|
failure:
|
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m_free (atext);
|
|
if ( fd != -1 )
|
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agent_close (fd);
|
|
m_free (pw );
|
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free_public_key( pk );
|
|
|
|
return NULL;
|
|
#endif /* Posix or W32 */
|
|
}
|
|
|
|
/*
|
|
* Clear the cached passphrase
|
|
*/
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void
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passphrase_clear_cache ( u32 *keyid, int algo )
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{
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#if defined(__riscos__)
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return ;
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#else
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size_t n;
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char buf[50];
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int fd = -1;
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size_t nread;
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u32 reply;
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PKT_public_key *pk;
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byte fpr[MAX_FINGERPRINT_LEN];
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#if MAX_FINGERPRINT_LEN < 20
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#error agent needs a 20 byte fingerprint
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#endif
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if (!opt.use_agent)
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return;
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pk = m_alloc_clear ( sizeof *pk );
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memset (fpr, 0, MAX_FINGERPRINT_LEN );
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if( !keyid || get_pubkey( pk, keyid ) ) {
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log_debug ("oops, no key in passphrase_clear_cache\n");
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goto failure; /* oops: no key for some reason */
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}
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{
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size_t dummy;
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fingerprint_from_pk( pk, fpr, &dummy );
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}
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if ( (fd = agent_open ()) == -1 )
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goto failure;
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n = 4 + 20;
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u32tobuf (buf, n );
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u32tobuf (buf+4, GPGA_PROT_CLEAR_PASSPHRASE );
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memcpy (buf+8, fpr, 20 );
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if ( writen ( fd, buf, 28 ) )
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goto failure;
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/* get response */
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if ( readn ( fd, buf, 8, &nread ) )
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goto failure;
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if ( nread < 8 ) {
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log_error ( "response from agent too short\n" );
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goto failure;
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}
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reply = buftou32 ( buf + 4 );
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if ( reply != GPGA_PROT_OKAY && reply != GPGA_PROT_NO_PASSPHRASE ) {
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log_error ( _("problem with the agent: agent returns 0x%lx\n"),
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(ulong)reply );
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}
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failure:
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if ( fd != -1 )
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agent_close (fd);
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free_public_key( pk );
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#endif /* Posix or W32 */
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}
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|
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|
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/****************
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* Get a passphrase for the secret key with KEYID, display TEXT
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* if the user needs to enter the passphrase.
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* mode 0 = standard, 2 = create new passphrase
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* Returns: a DEK with a session key; caller must free
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* or NULL if the passphrase was not correctly repeated.
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* (only for mode 2)
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* a dek->keylen of 0 means: no passphrase entered.
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* (only for mode 2)
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* pubkey_algo is only informational.
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*/
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DEK *
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passphrase_to_dek( u32 *keyid, int pubkey_algo,
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int cipher_algo, STRING2KEY *s2k, int mode )
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{
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char *pw = NULL;
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DEK *dek;
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STRING2KEY help_s2k;
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if( !s2k ) {
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/* This is used for the old rfc1991 mode
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* Note: This must match the code in encode.c with opt.rfc1991 set */
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int algo = opt.def_digest_algo ? opt.def_digest_algo
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: opt.s2k_digest_algo;
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s2k = &help_s2k;
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s2k->mode = 0;
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s2k->hash_algo = algo;
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}
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if( !next_pw && is_status_enabled() ) {
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char buf[50];
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if( keyid ) {
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u32 used_kid[2];
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char *us;
|
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if( keyid[2] && keyid[3] ) {
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used_kid[0] = keyid[2];
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used_kid[1] = keyid[3];
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}
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else {
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used_kid[0] = keyid[0];
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used_kid[1] = keyid[1];
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}
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|
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us = get_long_user_id_string( keyid );
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write_status_text( STATUS_USERID_HINT, us );
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m_free(us);
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sprintf( buf, "%08lX%08lX %08lX%08lX %d 0",
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(ulong)keyid[0], (ulong)keyid[1],
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(ulong)used_kid[0], (ulong)used_kid[1],
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pubkey_algo );
|
|
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write_status_text( STATUS_NEED_PASSPHRASE, buf );
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}
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else {
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sprintf( buf, "%d %d %d", cipher_algo, s2k->mode, s2k->hash_algo );
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write_status_text( STATUS_NEED_PASSPHRASE_SYM, buf );
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}
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}
|
|
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if( keyid && !opt.batch && !next_pw ) {
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PKT_public_key *pk = m_alloc_clear( sizeof *pk );
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size_t n;
|
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char *p;
|
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|
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tty_printf(_("\nYou need a passphrase to unlock the secret key for\n"
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"user: \"") );
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p = get_user_id( keyid, &n );
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tty_print_utf8_string( p, n );
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m_free(p);
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tty_printf("\"\n");
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|
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if( !get_pubkey( pk, keyid ) ) {
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const char *s = pubkey_algo_to_string( pk->pubkey_algo );
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tty_printf( _("%u-bit %s key, ID %08lX, created %s"),
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nbits_from_pk( pk ), s?s:"?", (ulong)keyid[1],
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strtimestamp(pk->timestamp) );
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if( keyid[2] && keyid[3] && keyid[0] != keyid[2]
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&& keyid[1] != keyid[3] )
|
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tty_printf( _(" (main key ID %08lX)"), (ulong)keyid[3] );
|
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tty_printf("\n");
|
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}
|
|
|
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tty_printf("\n");
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free_public_key( pk );
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}
|
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if( next_pw ) {
|
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pw = next_pw;
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next_pw = NULL;
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}
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else if ( opt.use_agent ) {
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pw = agent_get_passphrase ( keyid, mode == 2? 1: 0 );
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if ( !pw )
|
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pw = m_strdup ("");
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if( *pw && mode == 2 ) {
|
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char *pw2 = agent_get_passphrase ( keyid, 2 );
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if ( !pw2 )
|
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pw2 = m_strdup ("");
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if( strcmp(pw, pw2) ) {
|
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m_free(pw2);
|
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m_free(pw);
|
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return NULL;
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}
|
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m_free(pw2);
|
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}
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}
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else if( fd_passwd ) {
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pw = m_alloc_secure( strlen(fd_passwd)+1 );
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strcpy( pw, fd_passwd );
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}
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else if( opt.batch ) {
|
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log_error(_("can't query password in batchmode\n"));
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pw = m_strdup( "" ); /* return an empty passphrase */
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}
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else {
|
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pw = cpr_get_hidden("passphrase.enter", _("Enter passphrase: ") );
|
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tty_kill_prompt();
|
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if( mode == 2 && !cpr_enabled() ) {
|
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char *pw2 = cpr_get_hidden("passphrase.repeat",
|
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_("Repeat passphrase: ") );
|
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tty_kill_prompt();
|
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if( strcmp(pw, pw2) ) {
|
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m_free(pw2);
|
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m_free(pw);
|
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return NULL;
|
|
}
|
|
m_free(pw2);
|
|
}
|
|
}
|
|
|
|
if( !pw || !*pw )
|
|
write_status( STATUS_MISSING_PASSPHRASE );
|
|
|
|
dek = m_alloc_secure_clear ( sizeof *dek );
|
|
dek->algo = cipher_algo;
|
|
if( !*pw && mode == 2 )
|
|
dek->keylen = 0;
|
|
else
|
|
hash_passphrase( dek, pw, s2k, mode==2 );
|
|
m_free(last_pw);
|
|
last_pw = pw;
|
|
return dek;
|
|
}
|
|
|
|
|
|
/****************
|
|
* Hash a passphrase using the supplied s2k. If create is true, create
|
|
* a new salt or what else must be filled into the s2k for a new key.
|
|
* always needs: dek->algo, s2k->mode, s2k->hash_algo.
|
|
*/
|
|
static void
|
|
hash_passphrase( DEK *dek, char *pw, STRING2KEY *s2k, int create )
|
|
{
|
|
MD_HANDLE md;
|
|
int pass, i;
|
|
int used = 0;
|
|
int pwlen = strlen(pw);
|
|
|
|
assert( s2k->hash_algo );
|
|
dek->keylen = cipher_get_keylen( dek->algo ) / 8;
|
|
if( !(dek->keylen > 0 && dek->keylen <= DIM(dek->key)) )
|
|
BUG();
|
|
|
|
md = md_open( s2k->hash_algo, 1);
|
|
for(pass=0; used < dek->keylen ; pass++ ) {
|
|
if( pass ) {
|
|
if( (opt.emulate_bugs & EMUBUG_3DESS2K)) {
|
|
int tmp = md->finalized;
|
|
md_reset( md );
|
|
md->finalized = tmp;
|
|
}
|
|
else
|
|
md_reset(md);
|
|
for(i=0; i < pass; i++ ) /* preset the hash context */
|
|
md_putc(md, 0 );
|
|
}
|
|
|
|
if( s2k->mode == 1 || s2k->mode == 3 ) {
|
|
int len2 = pwlen + 8;
|
|
ulong count = len2;
|
|
|
|
if( create && !pass ) {
|
|
randomize_buffer(s2k->salt, 8, 1);
|
|
if( s2k->mode == 3 )
|
|
s2k->count = 96; /* 65536 iterations */
|
|
}
|
|
|
|
if( s2k->mode == 3 ) {
|
|
count = (16ul + (s2k->count & 15)) << ((s2k->count >> 4) + 6);
|
|
if( count < len2 )
|
|
count = len2;
|
|
}
|
|
/* a little bit complicated because we need a ulong for count */
|
|
while( count > len2 ) { /* maybe iterated+salted */
|
|
md_write( md, s2k->salt, 8 );
|
|
md_write( md, pw, pwlen );
|
|
count -= len2;
|
|
}
|
|
if( count < 8 )
|
|
md_write( md, s2k->salt, count );
|
|
else {
|
|
md_write( md, s2k->salt, 8 );
|
|
count -= 8;
|
|
md_write( md, pw, count );
|
|
}
|
|
}
|
|
else
|
|
md_write( md, pw, pwlen );
|
|
md_final( md );
|
|
i = md_digest_length( s2k->hash_algo );
|
|
if( i > dek->keylen - used )
|
|
i = dek->keylen - used;
|
|
memcpy( dek->key+used, md_read(md, s2k->hash_algo), i );
|
|
used += i;
|
|
}
|
|
md_close(md);
|
|
}
|
|
|