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gnupg/tools/gpgsplit.c
Werner Koch a028f24136
Backport of the new option parser from 2.3 
* configure.ac (GPGRT_ENABLE_ARGPARSE_MACROS): Define.
* common/argparse.c, common/argparse.h: Rewrite.
* tests/gpgscm/main.c: Switch to the new option parser.

* g10/gpg.c: Switch to the new option parser and enable a global conf
file.
* g10/gpgv.c: Ditto.
* agent/gpg-agent.c: Ditto.
* agent/preset-passphrase.c: Ditto.
* agent/protect-tool.c: Ditto.
* scd/scdaemon.c: Ditto.
* dirmngr/dirmngr.c: Ditto.
* dirmngr/dirmngr_ldap.c: Ditto
* dirmngr/dirmngr-client.c: Ditto.
* kbx/kbxutil.c: Ditto.
* tools/gpg-card.c: Ditto.
* tools/gpg-check-pattern.c: Ditto.
* tools/gpg-connect-agent.c: Ditto.
* tools/gpg-pair-tool.c: Ditto.
* tools/gpg-wks-client.c: Ditto.
* tools/gpg-wks-server.c: Ditto.
* tools/gpgconf.c: Ditto.
* tools/gpgsplit.c: Ditto.
* tools/gpgtar.c: Ditto.
* g13/g13.c: Ditto.
* g13/g13-syshelp.c: Ditto.  Do not force verbose mode.
* sm/gpgsm.c: Ditto. Add option --no-options.
--

This is backport from master

commit cdbe10b762f38449b86da69076209324b0c99982
commit ba463128ce65a0f347643f7246a8e097c5be19f1
commit 3bc004decd289810bc1b6ad6fb8f47e45c770ce6
commit 2c823bd878fcdbcc4f6c34993e1d0539d9a6b237
commit 0e8f6e2aa98c212442001036fb5178cd6cd8af59

but without changing all functions names to gpgrt.  Instead we use
wrapper functions which, when building against old Libgpg-error
versions, are implemented in argparse.c using code from the current
libgpg-error.  This allows to keep the dependency requirement at
libgpg-error 1.27 to support older distributions.  Tested builds
against 1.27 and 1.40-beta.

Note that g13-syshelp does not anymore default to --verbose because
that can now be enabled in /etc/gnupg/g13-syshelp.conf.

GnuPG-bug-id: 4788
Signed-off-by: Werner Koch <wk@gnupg.org>
2020-12-04 12:12:20 +01:00

898 lines
20 KiB
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/* gpgsplit.c - An OpenPGP packet splitting tool
* Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG 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 3 of the License, or
* (at your option) any later version.
*
* GnuPG 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, see <https://www.gnu.org/licenses/>.
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <assert.h>
#include <sys/types.h>
#ifdef HAVE_DOSISH_SYSTEM
# include <fcntl.h> /* for setmode() */
#endif
#ifdef HAVE_ZIP
# include <zlib.h>
#endif
#if defined(__riscos__) && defined(USE_ZLIBRISCOS)
# include "zlib-riscos.h"
#endif
#define INCLUDED_BY_MAIN_MODULE 1
#include "../common/util.h"
#include "../common/openpgpdefs.h"
#ifdef HAVE_BZIP2
# include <bzlib.h>
#endif /* HAVE_BZIP2 */
static int opt_verbose;
static const char *opt_prefix = "";
static int opt_uncompress;
static int opt_secret_to_public;
static int opt_no_split;
static void g10_exit( int rc );
static void split_packets (const char *fname);
enum cmd_and_opt_values {
aNull = 0,
oVerbose = 'v',
oPrefix = 'p',
oUncompress = 500,
oSecretToPublic,
oNoSplit,
aTest
};
static ARGPARSE_OPTS opts[] = {
{ 301, NULL, 0, "@Options:\n " },
{ oVerbose, "verbose", 0, "verbose" },
{ oPrefix, "prefix", 2, "|STRING|Prepend filenames with STRING" },
{ oUncompress, "uncompress", 0, "uncompress a packet"},
{ oSecretToPublic, "secret-to-public", 0, "convert secret keys to public keys"},
{ oNoSplit, "no-split", 0, "write to stdout and don't actually split"},
ARGPARSE_end ()
};
static const char *
my_strusage (int level)
{
const char *p;
switch (level)
{
case 9: p = "GPL-3.0-or-later"; break;
case 11: p = "gpgsplit (@GNUPG@)";
break;
case 13: p = VERSION; break;
case 14: p = GNUPG_DEF_COPYRIGHT_LINE; break;
case 17: p = PRINTABLE_OS_NAME; break;
case 19: p = "Please report bugs to <@EMAIL@>.\n"; break;
case 1:
case 40: p =
"Usage: gpgsplit [options] [files] (-h for help)";
break;
case 41: p =
"Syntax: gpgsplit [options] [files]\n"
"Split an OpenPGP message into packets\n";
break;
default: p = NULL;
}
return p;
}
int
main (int argc, char **argv)
{
ARGPARSE_ARGS pargs;
#ifdef HAVE_DOSISH_SYSTEM
setmode( fileno(stdin), O_BINARY );
setmode( fileno(stdout), O_BINARY );
#endif
log_set_prefix ("gpgsplit", GPGRT_LOG_WITH_PREFIX);
set_strusage (my_strusage);
pargs.argc = &argc;
pargs.argv = &argv;
pargs.flags= ARGPARSE_FLAG_KEEP;
while (gnupg_argparse (NULL, &pargs, opts))
{
switch (pargs.r_opt)
{
case oVerbose: opt_verbose = 1; break;
case oPrefix: opt_prefix = pargs.r.ret_str; break;
case oUncompress: opt_uncompress = 1; break;
case oSecretToPublic: opt_secret_to_public = 1; break;
case oNoSplit: opt_no_split = 1; break;
default : pargs.err = ARGPARSE_PRINT_ERROR; break;
}
}
gnupg_argparse (NULL, &pargs, NULL); /* Release internal state. */
if (log_get_errorcount(0))
g10_exit (2);
if (!argc)
split_packets (NULL);
else
{
for ( ;argc; argc--, argv++)
split_packets (*argv);
}
g10_exit (0);
return 0;
}
static void
g10_exit (int rc)
{
rc = rc? rc : log_get_errorcount(0)? 2 : 0;
exit(rc );
}
static const char *
pkttype_to_string (int pkttype)
{
const char *s;
switch (pkttype)
{
case PKT_PUBKEY_ENC : s = "pk_enc"; break;
case PKT_SIGNATURE : s = "sig"; break;
case PKT_SYMKEY_ENC : s = "sym_enc"; break;
case PKT_ONEPASS_SIG : s = "onepass_sig"; break;
case PKT_SECRET_KEY : s = "secret_key"; break;
case PKT_PUBLIC_KEY : s = "public_key"; break;
case PKT_SECRET_SUBKEY : s = "secret_subkey"; break;
case PKT_COMPRESSED :
s = opt_uncompress? "uncompressed":"compressed";
break;
case PKT_ENCRYPTED : s = "encrypted"; break;
case PKT_MARKER : s = "marker"; break;
case PKT_PLAINTEXT : s = "plaintext"; break;
case PKT_RING_TRUST : s = "ring_trust"; break;
case PKT_USER_ID : s = "user_id"; break;
case PKT_PUBLIC_SUBKEY : s = "public_subkey"; break;
case PKT_OLD_COMMENT : s = "old_comment"; break;
case PKT_ATTRIBUTE : s = "attribute"; break;
case PKT_ENCRYPTED_MDC : s = "encrypted_mdc"; break;
case PKT_MDC : s = "mdc"; break;
case PKT_COMMENT : s = "comment"; break;
case PKT_GPG_CONTROL : s = "gpg_control"; break;
default: s = "unknown"; break;
}
return s;
}
/*
* Create a new filename and a return a pointer to a statically
* allocated buffer
*/
static char *
create_filename (int pkttype)
{
static unsigned int partno = 0;
static char *name;
if (!name)
name = xmalloc (strlen (opt_prefix) + 100 );
assert (pkttype < 1000 && pkttype >= 0 );
partno++;
sprintf (name, "%s%06u-%03d" EXTSEP_S "%.40s",
opt_prefix, partno, pkttype, pkttype_to_string (pkttype));
return name;
}
static int
read_u16 (FILE *fp, size_t *rn)
{
int c;
if ( (c = getc (fp)) == EOF )
return -1;
*rn = c << 8;
if ( (c = getc (fp)) == EOF )
return -1;
*rn |= c;
return 0;
}
static int
read_u32 (FILE *fp, unsigned long *rn)
{
size_t tmp;
if (read_u16 (fp, &tmp))
return -1;
*rn = tmp << 16;
if (read_u16 (fp, &tmp))
return -1;
*rn |= tmp;
return 0;
}
static int
write_old_header (FILE *fp, int pkttype, unsigned int len)
{
int ctb = (0x80 | ((pkttype & 15)<<2));
if (len < 256)
;
else if (len < 65536)
ctb |= 1;
else
ctb |= 2;
if ( putc ( ctb, fp) == EOF )
return -1;
if ( (ctb & 2) )
{
if (putc ((len>>24), fp) == EOF)
return -1;
if (putc ((len>>16), fp) == EOF)
return -1;
}
if ( (ctb & 3) )
{
if (putc ((len>>8), fp) == EOF)
return -1;
}
if (putc ((len&0xff), fp) == EOF)
return -1;
return 0;
}
static int
write_new_header (FILE *fp, int pkttype, unsigned int len)
{
if ( putc ((0xc0 | (pkttype & 0x3f)), fp) == EOF )
return -1;
if (len < 192)
{
if (putc (len, fp) == EOF)
return -1;
}
else if (len < 8384)
{
len -= 192;
if (putc ((len/256)+192, fp) == EOF)
return -1;
if (putc ((len%256), fp) == EOF)
return -1;
}
else
{
if (putc ( 0xff, fp) == EOF)
return -1;
if (putc ( (len >> 24), fp) == EOF)
return -1;
if (putc ( (len >> 16), fp) == EOF)
return -1;
if (putc ( (len >> 8), fp) == EOF)
return -1;
if (putc ( (len & 0xff), fp) == EOF)
return -1;
}
return 0;
}
/* Return the length of the public key given BUF of BUFLEN with a
secret key. */
static int
public_key_length (const unsigned char *buf, size_t buflen)
{
const unsigned char *s;
int nmpis;
/* byte version number (3 or 4)
u32 creation time
[u16 valid days (version 3 only)]
byte algorithm
n MPIs (n and e) */
if (!buflen)
return 0;
if (buf[0] < 2 || buf[0] > 4)
return 0; /* wrong version number */
if (buflen < (buf[0] == 4? 6:8))
return 0;
s = buf + (buf[0] == 4? 6:8);
buflen -= (buf[0] == 4? 6:8);
switch (s[-1])
{
case 1:
case 2:
case 3:
nmpis = 2;
break;
case 16:
case 20:
nmpis = 3;
break;
case 17:
nmpis = 4;
break;
default:
return 0;
}
for (; nmpis; nmpis--)
{
unsigned int nbits, nbytes;
if (buflen < 2)
return 0;
nbits = (s[0] << 8) | s[1];
s += 2; buflen -= 2;
nbytes = (nbits+7) / 8;
if (buflen < nbytes)
return 0;
s += nbytes; buflen -= nbytes;
}
return s - buf;
}
#ifdef HAVE_ZIP
static int
handle_zlib(int algo,FILE *fpin,FILE *fpout)
{
z_stream zs;
byte *inbuf, *outbuf;
unsigned int inbufsize, outbufsize;
int c,zinit_done, zrc, nread, count;
size_t n;
memset (&zs, 0, sizeof zs);
inbufsize = 2048;
inbuf = xmalloc (inbufsize);
outbufsize = 8192;
outbuf = xmalloc (outbufsize);
zs.avail_in = 0;
zinit_done = 0;
do
{
if (zs.avail_in < inbufsize)
{
n = zs.avail_in;
if (!n)
zs.next_in = (Bytef *) inbuf;
count = inbufsize - n;
for (nread=0;
nread < count && (c=getc (fpin)) != EOF;
nread++)
inbuf[n+nread] = c;
n += nread;
if (nread < count && algo == 1)
{
inbuf[n] = 0xFF; /* chew dummy byte */
n++;
}
zs.avail_in = n;
}
zs.next_out = (Bytef *) outbuf;
zs.avail_out = outbufsize;
if (!zinit_done)
{
zrc = (algo == 1? inflateInit2 ( &zs, -13)
: inflateInit ( &zs ));
if (zrc != Z_OK)
{
log_fatal ("zlib problem: %s\n", zs.msg? zs.msg :
zrc == Z_MEM_ERROR ? "out of core" :
zrc == Z_VERSION_ERROR ?
"invalid lib version" :
"unknown error" );
}
zinit_done = 1;
}
else
{
#ifdef Z_SYNC_FLUSH
zrc = inflate (&zs, Z_SYNC_FLUSH);
#else
zrc = inflate (&zs, Z_PARTIAL_FLUSH);
#endif
if (zrc == Z_STREAM_END)
; /* eof */
else if (zrc != Z_OK && zrc != Z_BUF_ERROR)
{
if (zs.msg)
log_fatal ("zlib inflate problem: %s\n", zs.msg );
else
log_fatal ("zlib inflate problem: rc=%d\n", zrc );
}
for (n=0; n < outbufsize - zs.avail_out; n++)
{
if (putc (outbuf[n], fpout) == EOF )
return 1;
}
}
}
while (zrc != Z_STREAM_END && zrc != Z_BUF_ERROR);
{
int i;
fputs ("Left over bytes:", stderr);
for (i=0; i < zs.avail_in; i++)
fprintf (stderr, " %02X", zs.next_in[i]);
putc ('\n', stderr);
}
inflateEnd (&zs);
return 0;
}
#endif /*HAVE_ZIP*/
#ifdef HAVE_BZIP2
static int
handle_bzip2(int algo,FILE *fpin,FILE *fpout)
{
bz_stream bzs;
byte *inbuf, *outbuf;
unsigned int inbufsize, outbufsize;
int c,zinit_done, zrc, nread, count;
size_t n;
memset (&bzs, 0, sizeof bzs);
inbufsize = 2048;
inbuf = xmalloc (inbufsize);
outbufsize = 8192;
outbuf = xmalloc (outbufsize);
bzs.avail_in = 0;
zinit_done = 0;
do
{
if (bzs.avail_in < inbufsize)
{
n = bzs.avail_in;
if (!n)
bzs.next_in = inbuf;
count = inbufsize - n;
for (nread=0;
nread < count && (c=getc (fpin)) != EOF;
nread++)
inbuf[n+nread] = c;
n += nread;
if (nread < count && algo == 1)
{
inbuf[n] = 0xFF; /* chew dummy byte */
n++;
}
bzs.avail_in = n;
}
bzs.next_out = outbuf;
bzs.avail_out = outbufsize;
if (!zinit_done)
{
zrc = BZ2_bzDecompressInit(&bzs,0,0);
if (zrc != BZ_OK)
log_fatal ("bz2lib problem: %d\n",zrc);
zinit_done = 1;
}
else
{
zrc = BZ2_bzDecompress(&bzs);
if (zrc == BZ_STREAM_END)
; /* eof */
else if (zrc != BZ_OK && zrc != BZ_PARAM_ERROR)
log_fatal ("bz2lib inflate problem: %d\n", zrc );
for (n=0; n < outbufsize - bzs.avail_out; n++)
{
if (putc (outbuf[n], fpout) == EOF )
return 1;
}
}
}
while (zrc != BZ_STREAM_END && zrc != BZ_PARAM_ERROR);
BZ2_bzDecompressEnd(&bzs);
return 0;
}
#endif /* HAVE_BZIP2 */
/* hdr must point to a buffer large enough to hold all header bytes */
static int
write_part (FILE *fpin, unsigned long pktlen,
int pkttype, int partial, unsigned char *hdr, size_t hdrlen)
{
FILE *fpout;
int c, first;
unsigned char *p;
const char *outname = create_filename (pkttype);
#if defined(__riscos__) && defined(USE_ZLIBRISCOS)
static int initialized = 0;
if (!initialized)
initialized = riscos_load_module("ZLib", zlib_path, 1);
#endif
if (opt_no_split)
fpout = stdout;
else
{
if (opt_verbose)
log_info ("writing '%s'\n", outname);
fpout = gnupg_fopen (outname, "wb");
if (!fpout)
{
log_error ("error creating '%s': %s\n", outname, strerror(errno));
/* stop right now, otherwise we would mess up the sequence
of the part numbers */
g10_exit (1);
}
}
if (opt_secret_to_public
&& (pkttype == PKT_SECRET_KEY || pkttype == PKT_SECRET_SUBKEY))
{
unsigned char *blob = xmalloc (pktlen);
int i, len;
pkttype = pkttype == PKT_SECRET_KEY? PKT_PUBLIC_KEY:PKT_PUBLIC_SUBKEY;
for (i=0; i < pktlen; i++)
{
c = getc (fpin);
if (c == EOF)
goto read_error;
blob[i] = c;
}
len = public_key_length (blob, pktlen);
if (!len)
{
log_error ("error calculating public key length\n");
g10_exit (1);
}
if ( (hdr[0] & 0x40) )
{
if (write_new_header (fpout, pkttype, len))
goto write_error;
}
else
{
if (write_old_header (fpout, pkttype, len))
goto write_error;
}
for (i=0; i < len; i++)
{
if ( putc (blob[i], fpout) == EOF )
goto write_error;
}
goto ready;
}
if (!opt_uncompress)
{
for (p=hdr; hdrlen; p++, hdrlen--)
{
if ( putc (*p, fpout) == EOF )
goto write_error;
}
}
first = 1;
while (partial)
{
size_t partlen;
if (partial == 1)
{ /* openpgp */
if (first )
{
c = pktlen;
assert( c >= 224 && c < 255 );
first = 0;
}
else if ((c = getc (fpin)) == EOF )
goto read_error;
else
hdr[hdrlen++] = c;
if (c < 192)
{
pktlen = c;
partial = 0; /* (last segment may follow) */
}
else if (c < 224 )
{
pktlen = (c - 192) * 256;
if ((c = getc (fpin)) == EOF)
goto read_error;
hdr[hdrlen++] = c;
pktlen += c + 192;
partial = 0;
}
else if (c == 255)
{
if (read_u32 (fpin, &pktlen))
goto read_error;
hdr[hdrlen++] = pktlen >> 24;
hdr[hdrlen++] = pktlen >> 16;
hdr[hdrlen++] = pktlen >> 8;
hdr[hdrlen++] = pktlen;
partial = 0;
}
else
{ /* next partial body length */
for (p=hdr; hdrlen; p++, hdrlen--)
{
if ( putc (*p, fpout) == EOF )
goto write_error;
}
partlen = 1 << (c & 0x1f);
for (; partlen; partlen--)
{
if ((c = getc (fpin)) == EOF)
goto read_error;
if ( putc (c, fpout) == EOF )
goto write_error;
}
}
}
else if (partial == 2)
{ /* old gnupg */
assert (!pktlen);
if ( read_u16 (fpin, &partlen) )
goto read_error;
hdr[hdrlen++] = partlen >> 8;
hdr[hdrlen++] = partlen;
for (p=hdr; hdrlen; p++, hdrlen--)
{
if ( putc (*p, fpout) == EOF )
goto write_error;
}
if (!partlen)
partial = 0; /* end of packet */
for (; partlen; partlen--)
{
c = getc (fpin);
if (c == EOF)
goto read_error;
if ( putc (c, fpout) == EOF )
goto write_error;
}
}
else
{ /* compressed: read to end */
pktlen = 0;
partial = 0;
hdrlen = 0;
if (opt_uncompress)
{
if ((c = getc (fpin)) == EOF)
goto read_error;
if (0)
;
#ifdef HAVE_ZIP
else if(c==1 || c==2)
{
if(handle_zlib(c,fpin,fpout))
goto write_error;
}
#endif /* HAVE_ZIP */
#ifdef HAVE_BZIP2
else if(c==3)
{
if(handle_bzip2(c,fpin,fpout))
goto write_error;
}
#endif /* HAVE_BZIP2 */
else
{
log_error("invalid compression algorithm (%d)\n",c);
goto read_error;
}
}
else
{
while ( (c=getc (fpin)) != EOF )
{
if ( putc (c, fpout) == EOF )
goto write_error;
}
}
if (!feof (fpin))
goto read_error;
}
}
for (p=hdr; hdrlen; p++, hdrlen--)
{
if ( putc (*p, fpout) == EOF )
goto write_error;
}
/* standard packet or last segment of partial length encoded packet */
for (; pktlen; pktlen--)
{
c = getc (fpin);
if (c == EOF)
goto read_error;
if ( putc (c, fpout) == EOF )
goto write_error;
}
ready:
if ( !opt_no_split && fclose (fpout) )
log_error ("error closing '%s': %s\n", outname, strerror (errno));
return 0;
write_error:
log_error ("error writing '%s': %s\n", outname, strerror (errno));
if (!opt_no_split)
fclose (fpout);
return 2;
read_error:
if (!opt_no_split)
{
int save = errno;
fclose (fpout);
errno = save;
}
return -1;
}
static int
do_split (FILE *fp)
{
int c, ctb, pkttype;
unsigned long pktlen = 0;
int partial = 0;
unsigned char header[20];
int header_idx = 0;
ctb = getc (fp);
if (ctb == EOF)
return 3; /* ready */
header[header_idx++] = ctb;
if (!(ctb & 0x80))
{
log_error("invalid CTB %02x\n", ctb );
return 1;
}
if ( (ctb & 0x40) )
{ /* new CTB */
pkttype = (ctb & 0x3f);
if( (c = getc (fp)) == EOF )
return -1;
header[header_idx++] = c;
if ( c < 192 )
pktlen = c;
else if ( c < 224 )
{
pktlen = (c - 192) * 256;
if( (c = getc (fp)) == EOF )
return -1;
header[header_idx++] = c;
pktlen += c + 192;
}
else if ( c == 255 )
{
if (read_u32 (fp, &pktlen))
return -1;
header[header_idx++] = pktlen >> 24;
header[header_idx++] = pktlen >> 16;
header[header_idx++] = pktlen >> 8;
header[header_idx++] = pktlen;
}
else
{ /* partial body length */
pktlen = c;
partial = 1;
}
}
else
{
int lenbytes;
pkttype = (ctb>>2)&0xf;
lenbytes = ((ctb&3)==3)? 0 : (1<<(ctb & 3));
if (!lenbytes )
{
pktlen = 0; /* don't know the value */
if( pkttype == PKT_COMPRESSED )
partial = 3;
else
partial = 2; /* the old GnuPG partial length encoding */
}
else
{
for ( ; lenbytes; lenbytes-- )
{
pktlen <<= 8;
if( (c = getc (fp)) == EOF )
return -1;
header[header_idx++] = c;
pktlen |= c;
}
}
}
return write_part (fp, pktlen, pkttype, partial, header, header_idx);
}
static void
split_packets (const char *fname)
{
FILE *fp;
int rc;
if (!fname || !strcmp (fname, "-"))
{
fp = stdin;
fname = "-";
}
else if ( !(fp = gnupg_fopen (fname,"rb")) )
{
log_error ("can't open '%s': %s\n", fname, strerror (errno));
return;
}
while ( !(rc = do_split (fp)) )
;
if ( rc > 0 )
; /* error already handled */
else if ( ferror (fp) )
log_error ("error reading '%s': %s\n", fname, strerror (errno));
else
log_error ("premature EOF while reading '%s'\n", fname );
if ( fp != stdin )
fclose (fp);
}
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