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gnupg/g10/sign.c
David Shaw b8858a3ef1 --openpgp implies --allow-non-selfsigned-uid 
If none of the uids are primary (because none are valid) then pick the
first to be primary (but still invalid).  This is for cosmetics in case
some display needs to print a user ID from a non-selfsigned key.  Also use
--allow-non-selfsigned-uid to make such a key valid and not
--always-trust.  The key is *not* automatically trusted via
--allow-non-selfsigned-uid.

Make sure non-selfsigned uids print [uncertain] on verification even
though one is primary now.

If the main key is not valid, then neither are the subkeys.

Allow --allow-non-selfsigned-uid to work on completely unsigned keys.
Print the uids in UTF8.  Remove mark_non_selfsigned_uids_valid()

Show revocation key as UTF8.

Allow --not-dash-escaped to work with v3 keys.
2002-03-17 23:47:32 +00:00

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/* sign.c - sign data
* Copyright (C) 1998, 1999, 2000, 2001 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <unistd.h> /* need sleep() */
#include "options.h"
#include "packet.h"
#include "errors.h"
#include "iobuf.h"
#include "keydb.h"
#include "memory.h"
#include "util.h"
#include "main.h"
#include "filter.h"
#include "ttyio.h"
#include "trustdb.h"
#include "status.h"
#include "i18n.h"
#ifdef HAVE_DOSISH_SYSTEM
#define LF "\r\n"
void __stdcall Sleep(ulong);
#define sleep(a) Sleep((a)*1000)
#else
#define LF "\n"
#endif
/****************
* Create a notation. It is assumed that the stings in STRLIST
* are already checked to contain only printable data and have a valid
* NAME=VALUE format.
*/
static void
mk_notation_and_policy( PKT_signature *sig, PKT_public_key *pk )
{
const char *string;
char *s=NULL;
byte *buf;
unsigned n1, n2;
/* notation data */
if( opt.notation_data && sig->version < 4 )
log_info("can't put notation data into v3 signatures\n");
else if( opt.notation_data ) {
STRLIST nd = opt.notation_data;
for( ; nd; nd = nd->next ) {
string = nd->d;
s = strchr( string, '=' );
if( !s )
BUG(); /* we have already parsed this */
n1 = s - string;
s++;
n2 = strlen(s);
buf = m_alloc( 8 + n1 + n2 );
buf[0] = 0x80; /* human readable */
buf[1] = buf[2] = buf[3] = 0;
buf[4] = n1 >> 8;
buf[5] = n1;
buf[6] = n2 >> 8;
buf[7] = n2;
memcpy(buf+8, string, n1 );
memcpy(buf+8+n1, s, n2 );
build_sig_subpkt( sig, SIGSUBPKT_NOTATION
| ((nd->flags & 1)? SIGSUBPKT_FLAG_CRITICAL:0),
buf, 8+n1+n2 );
if(opt.show_notation)
show_notation(sig,0);
}
}
/* set policy URL */
if( IS_SIG(sig) && opt.sig_policy_url )
{
if(sig->version<4)
log_info("can't put a policy URL into v3 signatures\n");
else
s=m_strdup(opt.sig_policy_url);
}
else if( IS_CERT(sig) && opt.cert_policy_url )
{
if(sig->version<4)
log_info("can't put a policy URL into v3 key signatures\n");
else
if(pk)
{
s=pct_expando(opt.cert_policy_url,pk);
if(!s)
{
log_error(_("WARNING: unable to %%-expand policy url "
"(too large). Using unexpanded.\n"));
s=m_strdup(opt.cert_policy_url);
}
}
else
s=m_strdup(opt.cert_policy_url);
}
if( s ) {
if( *s == '!' )
build_sig_subpkt( sig, SIGSUBPKT_POLICY | SIGSUBPKT_FLAG_CRITICAL,
s+1, strlen(s+1) );
else
build_sig_subpkt( sig, SIGSUBPKT_POLICY, s, strlen(s) );
if(opt.show_policy_url)
show_policy_url(sig,0);
}
m_free(s);
}
/*
* Helper to hash a user ID packet.
*/
static void
hash_uid (MD_HANDLE md, int sigversion, const PKT_user_id *uid)
{
if ( sigversion >= 4 ) {
byte buf[5];
if(uid->attrib_data) {
buf[0] = 0xd1; /* indicates an attribute packet */
buf[1] = uid->attrib_len >> 24; /* always use 4 length bytes */
buf[2] = uid->attrib_len >> 16;
buf[3] = uid->attrib_len >> 8;
buf[4] = uid->attrib_len;
}
else {
buf[0] = 0xb4; /* indicates a userid packet */
buf[1] = uid->len >> 24; /* always use 4 length bytes */
buf[2] = uid->len >> 16;
buf[3] = uid->len >> 8;
buf[4] = uid->len;
}
md_write( md, buf, 5 );
}
if(uid->attrib_data)
md_write (md, uid->attrib_data, uid->attrib_len );
else
md_write (md, uid->name, uid->len );
}
/*
* Helper to hash some parts from the signature
*/
static void
hash_sigversion_to_magic (MD_HANDLE md, const PKT_signature *sig)
{
if (sig->version >= 4)
md_putc (md, sig->version);
md_putc (md, sig->sig_class);
if (sig->version < 4) {
u32 a = sig->timestamp;
md_putc (md, (a >> 24) & 0xff );
md_putc (md, (a >> 16) & 0xff );
md_putc (md, (a >> 8) & 0xff );
md_putc (md, a & 0xff );
}
else {
byte buf[6];
size_t n;
md_putc (md, sig->pubkey_algo);
md_putc (md, sig->digest_algo);
if (sig->hashed) {
n = sig->hashed->len;
md_putc (md, (n >> 8) );
md_putc (md, n );
md_write (md, sig->hashed->data, n );
n += 6;
}
else {
md_putc (md, 0); /* always hash the length of the subpacket*/
md_putc (md, 0);
n = 6;
}
/* add some magic */
buf[0] = sig->version;
buf[1] = 0xff;
buf[2] = n >> 24; /* hmmm, n is only 16 bit, so this is always 0 */
buf[3] = n >> 16;
buf[4] = n >> 8;
buf[5] = n;
md_write (md, buf, 6);
}
}
static int
do_sign( PKT_secret_key *sk, PKT_signature *sig,
MD_HANDLE md, int digest_algo )
{
MPI frame;
byte *dp;
int rc;
if( sk->timestamp > sig->timestamp ) {
ulong d = sk->timestamp - sig->timestamp;
log_info( d==1 ? _("key has been created %lu second "
"in future (time warp or clock problem)\n")
: _("key has been created %lu seconds "
"in future (time warp or clock problem)\n"), d );
if( !opt.ignore_time_conflict )
return G10ERR_TIME_CONFLICT;
}
print_pubkey_algo_note(sk->pubkey_algo);
if( !digest_algo )
digest_algo = md_get_algo(md);
print_digest_algo_note( digest_algo );
dp = md_read( md, digest_algo );
sig->digest_algo = digest_algo;
sig->digest_start[0] = dp[0];
sig->digest_start[1] = dp[1];
frame = encode_md_value( sk->pubkey_algo, md,
digest_algo, mpi_get_nbits(sk->skey[0]), 0 );
rc = pubkey_sign( sk->pubkey_algo, sig->data, frame, sk->skey );
mpi_free(frame);
if (!rc && !opt.no_sig_create_check) {
/* check that the signature verification worked and nothing is
* fooling us e.g. by a bug in the signature create
* code or by deliberately introduced faults. */
PKT_public_key *pk = m_alloc_clear (sizeof *pk);
if( get_pubkey( pk, sig->keyid ) )
rc = G10ERR_NO_PUBKEY;
else {
frame = encode_md_value (pk->pubkey_algo, md,
sig->digest_algo,
mpi_get_nbits(pk->pkey[0]), 0);
rc = pubkey_verify (pk->pubkey_algo, frame, sig->data, pk->pkey,
NULL, NULL );
mpi_free (frame);
}
if (rc)
log_error (_("checking created signature failed: %s\n"),
g10_errstr (rc));
free_public_key (pk);
}
if( rc )
log_error(_("signing failed: %s\n"), g10_errstr(rc) );
else {
if( opt.verbose ) {
char *ustr = get_user_id_string( sig->keyid );
log_info(_("%s signature from: %s\n"),
pubkey_algo_to_string(sk->pubkey_algo), ustr );
m_free(ustr);
}
}
return rc;
}
int
complete_sig( PKT_signature *sig, PKT_secret_key *sk, MD_HANDLE md )
{
int rc=0;
if( !(rc=check_secret_key( sk, 0 )) )
rc = do_sign( sk, sig, md, 0 );
return rc;
}
static int
hash_for(int pubkey_algo, int packet_version )
{
if( opt.def_digest_algo )
return opt.def_digest_algo;
if( pubkey_algo == PUBKEY_ALGO_DSA )
return DIGEST_ALGO_SHA1;
if( pubkey_algo == PUBKEY_ALGO_RSA && packet_version < 4 )
return DIGEST_ALGO_MD5;
return DEFAULT_DIGEST_ALGO;
}
static int
only_old_style( SK_LIST sk_list )
{
SK_LIST sk_rover = NULL;
int old_style = 0;
/* if there are only old style capable key we use the old sytle */
for( sk_rover = sk_list; sk_rover; sk_rover = sk_rover->next ) {
PKT_secret_key *sk = sk_rover->sk;
if( sk->pubkey_algo == PUBKEY_ALGO_RSA && sk->version < 4 )
old_style = 1;
else
return 0;
}
return old_style;
}
static void
print_status_sig_created ( PKT_secret_key *sk, PKT_signature *sig, int what )
{
byte array[MAX_FINGERPRINT_LEN], *p;
char buf[100+MAX_FINGERPRINT_LEN*2];
size_t i, n;
sprintf(buf, "%c %d %d %02x %lu ",
what, sig->pubkey_algo, sig->digest_algo, sig->sig_class,
(ulong)sig->timestamp );
fingerprint_from_sk( sk, array, &n );
p = buf + strlen(buf);
for(i=0; i < n ; i++ )
sprintf(p+2*i, "%02X", array[i] );
write_status_text( STATUS_SIG_CREATED, buf );
}
/*
* Loop over the secret certificates in SK_LIST and build the one pass
* signature packets. OpenPGP says that the data should be bracket by
* the onepass-sig and signature-packet; so we build these onepass
* packet here in reverse order
*/
static int
write_onepass_sig_packets (SK_LIST sk_list, IOBUF out, int sigclass )
{
int skcount;
SK_LIST sk_rover;
for (skcount=0, sk_rover=sk_list; sk_rover; sk_rover = sk_rover->next)
skcount++;
for (; skcount; skcount--) {
PKT_secret_key *sk;
PKT_onepass_sig *ops;
PACKET pkt;
int i, rc;
for (i=0, sk_rover = sk_list; sk_rover; sk_rover = sk_rover->next ) {
if (++i == skcount)
break;
}
sk = sk_rover->sk;
ops = m_alloc_clear (sizeof *ops);
ops->sig_class = sigclass;
ops->digest_algo = hash_for (sk->pubkey_algo, sk->version);
ops->pubkey_algo = sk->pubkey_algo;
keyid_from_sk (sk, ops->keyid);
ops->last = (skcount == 1);
init_packet(&pkt);
pkt.pkttype = PKT_ONEPASS_SIG;
pkt.pkt.onepass_sig = ops;
rc = build_packet (out, &pkt);
free_packet (&pkt);
if (rc) {
log_error ("build onepass_sig packet failed: %s\n",
g10_errstr(rc));
return rc;
}
}
return 0;
}
/*
* Helper to write the plaintext (literal data) packet
*/
static int
write_plaintext_packet (IOBUF out, IOBUF inp, const char *fname, int ptmode)
{
PKT_plaintext *pt = NULL;
u32 filesize;
int rc = 0;
if (!opt.no_literal) {
if (fname || opt.set_filename) {
char *s = make_basename (opt.set_filename? opt.set_filename
: fname);
pt = m_alloc (sizeof *pt + strlen(s) - 1);
pt->namelen = strlen (s);
memcpy (pt->name, s, pt->namelen);
m_free (s);
}
else { /* no filename */
pt = m_alloc (sizeof *pt - 1);
pt->namelen = 0;
}
}
/* try to calculate the length of the data */
if (fname) {
if( !(filesize = iobuf_get_filelength(inp)) )
log_info (_("WARNING: `%s' is an empty file\n"), fname);
/* we can't yet encode the length of very large files,
* so we switch to partial length encoding in this case */
if (filesize >= IOBUF_FILELENGTH_LIMIT)
filesize = 0;
/* because the text_filter modifies the length of the
* data, it is not possible to know the used length
* without a double read of the file - to avoid that
* we simple use partial length packets.
*/
if ( ptmode == 't' )
filesize = 0;
}
else {
filesize = opt.set_filesize? opt.set_filesize : 0; /* stdin */
}
if (!opt.no_literal) {
PACKET pkt;
pt->timestamp = make_timestamp ();
pt->mode = ptmode;
pt->len = filesize;
pt->new_ctb = !pt->len && !opt.rfc1991;
pt->buf = inp;
init_packet(&pkt);
pkt.pkttype = PKT_PLAINTEXT;
pkt.pkt.plaintext = pt;
/*cfx.datalen = filesize? calc_packet_length( &pkt ) : 0;*/
if( (rc = build_packet (out, &pkt)) )
log_error ("build_packet(PLAINTEXT) failed: %s\n",
g10_errstr(rc) );
pt->buf = NULL;
}
else {
byte copy_buffer[4096];
int bytes_copied;
while ((bytes_copied = iobuf_read(inp, copy_buffer, 4096)) != -1)
if (iobuf_write(out, copy_buffer, bytes_copied) == -1) {
rc = G10ERR_WRITE_FILE;
log_error ("copying input to output failed: %s\n",
g10_errstr(rc));
break;
}
memset(copy_buffer, 0, 4096); /* burn buffer */
}
/* fixme: it seems that we never freed pt/pkt */
return rc;
}
/*
* Write the signatures from the SK_LIST to OUT. HASH must be a non-finalized
* hash which will not be changes here.
*/
static int
write_signature_packets (SK_LIST sk_list, IOBUF out, MD_HANDLE hash,
int sigclass, u32 timestamp, u32 duration,
int old_style, int status_letter)
{
SK_LIST sk_rover;
/* loop over the secret certificates */
for (sk_rover = sk_list; sk_rover; sk_rover = sk_rover->next) {
PKT_secret_key *sk;
PKT_signature *sig;
MD_HANDLE md;
int rc;
sk = sk_rover->sk;
/* build the signature packet */
sig = m_alloc_clear (sizeof *sig);
if(old_style || opt.force_v3_sigs)
sig->version=3;
else if(duration)
sig->version=4;
else
sig->version=sk->version;
keyid_from_sk (sk, sig->keyid);
sig->digest_algo = hash_for (sk->pubkey_algo, sk->version);
sig->pubkey_algo = sk->pubkey_algo;
if(timestamp)
sig->timestamp = timestamp;
else
sig->timestamp = make_timestamp();
if(duration)
sig->expiredate = sig->timestamp+duration;
sig->sig_class = sigclass;
md = md_copy (hash);
if (sig->version >= 4)
build_sig_subpkt_from_sig (sig);
mk_notation_and_policy (sig, NULL);
hash_sigversion_to_magic (md, sig);
md_final (md);
rc = do_sign( sk, sig, md, hash_for (sig->pubkey_algo, sk->version) );
md_close (md);
if( !rc ) { /* and write it */
PACKET pkt;
init_packet(&pkt);
pkt.pkttype = PKT_SIGNATURE;
pkt.pkt.signature = sig;
rc = build_packet (out, &pkt);
if (!rc && is_status_enabled()) {
print_status_sig_created ( sk, sig, status_letter);
}
free_packet (&pkt);
if (rc)
log_error ("build signature packet failed: %s\n",
g10_errstr(rc) );
}
if( rc )
return rc;;
}
return 0;
}
/****************
* Sign the files whose names are in FILENAME.
* If DETACHED has the value true,
* make a detached signature. If FILENAMES->d is NULL read from stdin
* and ignore the detached mode. Sign the file with all secret keys
* which can be taken from LOCUSR, if this is NULL, use the default one
* If ENCRYPTFLAG is true, use REMUSER (or ask if it is NULL) to encrypt the
* signed data for these users.
* If OUTFILE is not NULL; this file is used for output and the function
* does not ask for overwrite permission; output is then always
* uncompressed, non-armored and in binary mode.
*/
int
sign_file( STRLIST filenames, int detached, STRLIST locusr,
int encryptflag, STRLIST remusr, const char *outfile )
{
const char *fname;
armor_filter_context_t afx;
compress_filter_context_t zfx;
md_filter_context_t mfx;
text_filter_context_t tfx;
encrypt_filter_context_t efx;
IOBUF inp = NULL, out = NULL;
PACKET pkt;
int rc = 0;
PK_LIST pk_list = NULL;
SK_LIST sk_list = NULL;
SK_LIST sk_rover = NULL;
int multifile = 0;
int old_style = opt.rfc1991;
int compr_algo = -1; /* unknown */
u32 timestamp=0,duration=0;
memset( &afx, 0, sizeof afx);
memset( &zfx, 0, sizeof zfx);
memset( &mfx, 0, sizeof mfx);
memset( &tfx, 0, sizeof tfx);
memset( &efx, 0, sizeof efx);
init_packet( &pkt );
if( filenames ) {
fname = filenames->d;
multifile = !!filenames->next;
}
else
fname = NULL;
if( fname && filenames->next && (!detached || encryptflag) )
log_bug("multiple files can only be detached signed");
if(opt.ask_sig_expire && !opt.pgp2 && !opt.batch &&
!opt.force_v3_sigs && !old_style)
duration=ask_expire_interval(1);
if( (rc=build_sk_list( locusr, &sk_list, 1, PUBKEY_USAGE_SIG )) )
goto leave;
if( (!old_style && !duration) || opt.pgp2 )
old_style = only_old_style( sk_list );
if(!old_style && opt.pgp2)
{
log_info(_("you can only sign with PGP 2.x style keys "
"while in --pgp2 mode\n"));
log_info(_("this message may not be usable by PGP 2.x\n"));
opt.pgp2=0;
}
if( encryptflag ) {
if( (rc=build_pk_list( remusr, &pk_list, PUBKEY_USAGE_ENC )) )
goto leave;
if( !old_style )
compr_algo = select_algo_from_prefs( pk_list, PREFTYPE_ZIP );
}
/* prepare iobufs */
if( multifile ) /* have list of filenames */
inp = NULL; /* we do it later */
else if( !(inp = iobuf_open(fname)) ) {
log_error("can't open %s: %s\n", fname? fname: "[stdin]",
strerror(errno) );
rc = G10ERR_OPEN_FILE;
goto leave;
}
if( outfile ) {
if( !(out = iobuf_create( outfile )) ) {
log_error(_("can't create %s: %s\n"), outfile, strerror(errno) );
rc = G10ERR_CREATE_FILE;
goto leave;
}
else if( opt.verbose )
log_info(_("writing to `%s'\n"), outfile );
}
else if( (rc = open_outfile( fname, opt.armor? 1: detached? 2:0, &out )))
goto leave;
/* prepare to calculate the MD over the input */
if( opt.textmode && !outfile )
iobuf_push_filter( inp, text_filter, &tfx );
mfx.md = md_open(0, 0);
for( sk_rover = sk_list; sk_rover; sk_rover = sk_rover->next ) {
PKT_secret_key *sk = sk_rover->sk;
md_enable(mfx.md, hash_for(sk->pubkey_algo, sk->version ));
}
if( !multifile )
iobuf_push_filter( inp, md_filter, &mfx );
if( detached && !encryptflag && !opt.rfc1991 )
afx.what = 2;
if( opt.armor && !outfile )
iobuf_push_filter( out, armor_filter, &afx );
if( encryptflag ) {
efx.pk_list = pk_list;
/* fixme: set efx.cfx.datalen if known */
iobuf_push_filter( out, encrypt_filter, &efx );
}
if( opt.compress && !outfile && ( !detached || opt.compress_sigs) ) {
if( !compr_algo )
; /* don't use compression */
else {
if( old_style
|| compr_algo == 1
|| (compr_algo == -1 && !encryptflag) )
zfx.algo = 1; /* use the non optional algorithm */
iobuf_push_filter( out, compress_filter, &zfx );
}
}
/* Write the one-pass signature packets if needed */
if (!detached && !opt.rfc1991) {
rc = write_onepass_sig_packets (sk_list, out,
opt.textmode && !outfile ? 0x01:0x00);
if (rc)
goto leave;
}
/* setup the inner packet */
if( detached ) {
if( multifile ) {
STRLIST sl;
if( opt.verbose )
log_info(_("signing:") );
/* must walk reverse trough this list */
for( sl = strlist_last(filenames); sl;
sl = strlist_prev( filenames, sl ) ) {
if( !(inp = iobuf_open(sl->d)) ) {
log_error(_("can't open %s: %s\n"),
sl->d, strerror(errno) );
rc = G10ERR_OPEN_FILE;
goto leave;
}
if( opt.verbose )
fprintf(stderr, " `%s'", sl->d );
iobuf_push_filter( inp, md_filter, &mfx );
while( iobuf_get(inp) != -1 )
;
iobuf_close(inp); inp = NULL;
}
if( opt.verbose )
putc( '\n', stderr );
}
else {
/* read, so that the filter can calculate the digest */
while( iobuf_get(inp) != -1 )
;
}
}
else {
rc = write_plaintext_packet (out, inp, fname,
opt.textmode && !outfile ? 't':'b');
}
/* catch errors from above */
if (rc)
goto leave;
/* write the signatures */
rc = write_signature_packets (sk_list, out, mfx.md,
opt.textmode && !outfile? 0x01 : 0x00,
timestamp, duration,
old_style, detached ? 'D':'S');
if( rc )
goto leave;
leave:
if( rc )
iobuf_cancel(out);
else {
iobuf_close(out);
if (encryptflag)
write_status( STATUS_END_ENCRYPTION );
}
iobuf_close(inp);
md_close( mfx.md );
release_sk_list( sk_list );
release_pk_list( pk_list );
return rc;
}
/****************
* make a clear signature. note that opt.armor is not needed
*/
int
clearsign_file( const char *fname, STRLIST locusr, const char *outfile )
{
armor_filter_context_t afx;
MD_HANDLE textmd = NULL;
IOBUF inp = NULL, out = NULL;
PACKET pkt;
int rc = 0;
SK_LIST sk_list = NULL;
SK_LIST sk_rover = NULL;
int old_style = opt.rfc1991;
int only_md5 = 0;
u32 timestamp=0,duration=0;
memset( &afx, 0, sizeof afx);
init_packet( &pkt );
if(opt.ask_sig_expire && !opt.pgp2 && !opt.batch &&
!opt.force_v3_sigs && !old_style)
duration=ask_expire_interval(1);
if( (rc=build_sk_list( locusr, &sk_list, 1, PUBKEY_USAGE_SIG )) )
goto leave;
if( (!old_style && !duration) || opt.pgp2 )
old_style = only_old_style( sk_list );
if(!old_style && opt.pgp2)
{
log_info(_("you can only clearsign with PGP 2.x style keys "
"while in --pgp2 mode\n"));
log_info(_("this message may not be usable by PGP 2.x\n"));
opt.pgp2=0;
}
/* prepare iobufs */
if( !(inp = iobuf_open(fname)) ) {
log_error("can't open %s: %s\n", fname? fname: "[stdin]",
strerror(errno) );
rc = G10ERR_OPEN_FILE;
goto leave;
}
if( outfile ) {
if( !(out = iobuf_create( outfile )) ) {
log_error(_("can't create %s: %s\n"), outfile, strerror(errno) );
rc = G10ERR_CREATE_FILE;
goto leave;
}
else if( opt.verbose )
log_info(_("writing to `%s'\n"), outfile );
}
else if( (rc = open_outfile( fname, 1, &out )) )
goto leave;
iobuf_writestr(out, "-----BEGIN PGP SIGNED MESSAGE-----" LF );
for( sk_rover = sk_list; sk_rover; sk_rover = sk_rover->next ) {
PKT_secret_key *sk = sk_rover->sk;
if( hash_for(sk->pubkey_algo, sk->version) == DIGEST_ALGO_MD5 )
only_md5 = 1;
else {
only_md5 = 0;
break;
}
}
if( !(old_style && only_md5) ) {
const char *s;
int any = 0;
byte hashs_seen[256];
memset( hashs_seen, 0, sizeof hashs_seen );
iobuf_writestr(out, "Hash: " );
for( sk_rover = sk_list; sk_rover; sk_rover = sk_rover->next ) {
PKT_secret_key *sk = sk_rover->sk;
int i = hash_for(sk->pubkey_algo, sk->version);
if( !hashs_seen[ i & 0xff ] ) {
s = digest_algo_to_string( i );
if( s ) {
hashs_seen[ i & 0xff ] = 1;
if( any )
iobuf_put(out, ',' );
iobuf_writestr(out, s );
any = 1;
}
}
}
assert(any);
iobuf_writestr(out, LF );
}
if( opt.not_dash_escaped )
iobuf_writestr( out,
"NotDashEscaped: You need GnuPG to verify this message" LF );
iobuf_writestr(out, LF );
textmd = md_open(0, 0);
for( sk_rover = sk_list; sk_rover; sk_rover = sk_rover->next ) {
PKT_secret_key *sk = sk_rover->sk;
md_enable(textmd, hash_for(sk->pubkey_algo, sk->version));
}
if ( DBG_HASHING )
md_start_debug( textmd, "clearsign" );
copy_clearsig_text( out, inp, textmd,
!opt.not_dash_escaped, opt.escape_from, old_style );
/* fixme: check for read errors */
/* now write the armor */
afx.what = 2;
iobuf_push_filter( out, armor_filter, &afx );
/* write the signatures */
rc = write_signature_packets (sk_list, out, textmd, 0x01,
timestamp, duration, old_style, 'C');
if( rc )
goto leave;
leave:
if( rc )
iobuf_cancel(out);
else
iobuf_close(out);
iobuf_close(inp);
md_close( textmd );
release_sk_list( sk_list );
return rc;
}
/*
* Sign and conventionally encrypt the given file.
* FIXME: Far too much code is duplicated - revamp the whole file.
*/
int
sign_symencrypt_file (const char *fname, STRLIST locusr)
{
armor_filter_context_t afx;
compress_filter_context_t zfx;
md_filter_context_t mfx;
text_filter_context_t tfx;
cipher_filter_context_t cfx;
IOBUF inp = NULL, out = NULL;
PACKET pkt;
STRING2KEY *s2k = NULL;
int rc = 0;
SK_LIST sk_list = NULL;
SK_LIST sk_rover = NULL;
int old_style = opt.rfc1991;
int compr_algo = -1; /* unknown */
int algo;
u32 timestamp=0,duration=0;
memset( &afx, 0, sizeof afx);
memset( &zfx, 0, sizeof zfx);
memset( &mfx, 0, sizeof mfx);
memset( &tfx, 0, sizeof tfx);
memset( &cfx, 0, sizeof cfx);
init_packet( &pkt );
if(opt.ask_sig_expire && !opt.batch && !opt.force_v3_sigs && !old_style)
duration=ask_expire_interval(1);
rc = build_sk_list (locusr, &sk_list, 1, PUBKEY_USAGE_SIG);
if (rc)
goto leave;
if( !old_style && !duration )
old_style = only_old_style( sk_list );
/* prepare iobufs */
inp = iobuf_open(fname);
if( !inp ) {
log_error("can't open %s: %s\n", fname? fname: "[stdin]",
strerror(errno) );
rc = G10ERR_OPEN_FILE;
goto leave;
}
/* prepare key */
s2k = m_alloc_clear( sizeof *s2k );
s2k->mode = opt.rfc1991? 0:opt.s2k_mode;
s2k->hash_algo = opt.def_digest_algo ? opt.def_digest_algo
: opt.s2k_digest_algo;
algo = opt.def_cipher_algo ? opt.def_cipher_algo : opt.s2k_cipher_algo;
if (!opt.quiet || !opt.batch)
log_info (_("%s encryption will be used\n"),
cipher_algo_to_string(algo) );
cfx.dek = passphrase_to_dek( NULL, 0, algo, s2k, 2, NULL );
if (!cfx.dek || !cfx.dek->keylen) {
rc = G10ERR_PASSPHRASE;
log_error(_("error creating passphrase: %s\n"), g10_errstr(rc) );
goto leave;
}
/* now create the outfile */
rc = open_outfile (fname, opt.armor? 1:0, &out);
if (rc)
goto leave;
/* prepare to calculate the MD over the input */
if (opt.textmode)
iobuf_push_filter (inp, text_filter, &tfx);
mfx.md = md_open(0, 0);
for (sk_rover = sk_list; sk_rover; sk_rover = sk_rover->next) {
PKT_secret_key *sk = sk_rover->sk;
md_enable (mfx.md, hash_for (sk->pubkey_algo, sk->version ));
}
iobuf_push_filter (inp, md_filter, &mfx);
/* Push armor output filter */
if (opt.armor)
iobuf_push_filter (out, armor_filter, &afx);
/* Write the symmetric key packet */
/*(current filters: armor)*/
if (!opt.rfc1991) {
PKT_symkey_enc *enc = m_alloc_clear( sizeof *enc );
enc->version = 4;
enc->cipher_algo = cfx.dek->algo;
enc->s2k = *s2k;
pkt.pkttype = PKT_SYMKEY_ENC;
pkt.pkt.symkey_enc = enc;
if( (rc = build_packet( out, &pkt )) )
log_error("build symkey packet failed: %s\n", g10_errstr(rc) );
m_free(enc);
}
/* Push the encryption filter */
iobuf_push_filter( out, cipher_filter, &cfx );
/* Push the Zip filter */
if (opt.compress) {
if (!compr_algo)
; /* don't use compression */
else {
if( old_style || compr_algo == 1 )
zfx.algo = 1; /* use the non optional algorithm */
iobuf_push_filter( out, compress_filter, &zfx );
}
}
/* Write the one-pass signature packets */
/*(current filters: zip - encrypt - armor)*/
if (!opt.rfc1991) {
rc = write_onepass_sig_packets (sk_list, out,
opt.textmode? 0x01:0x00);
if (rc)
goto leave;
}
/* Pipe data through all filters; i.e. write the signed stuff */
/*(current filters: zip - encrypt - armor)*/
rc = write_plaintext_packet (out, inp, fname, opt.textmode ? 't':'b');
if (rc)
goto leave;
/* Write the signatures */
/*(current filters: zip - encrypt - armor)*/
rc = write_signature_packets (sk_list, out, mfx.md,
opt.textmode? 0x01 : 0x00,
timestamp, duration,
old_style, 'S');
if( rc )
goto leave;
leave:
if( rc )
iobuf_cancel(out);
else {
iobuf_close(out);
write_status( STATUS_END_ENCRYPTION );
}
iobuf_close(inp);
release_sk_list( sk_list );
md_close( mfx.md );
m_free(cfx.dek);
m_free(s2k);
return rc;
}
/****************
* Create a signature packet for the given public key certificate and
* the user id and return it in ret_sig. User signature class SIGCLASS
* user-id is not used (and may be NULL if sigclass is 0x20) If
* DIGEST_ALGO is 0 the function selects an appropriate one.
* SIGVERSION gives the minimal required signature packet version;
* this is needed so that special properties like local sign are not
* applied (actually: dropped) when a v3 key is used. TIMESTAMP is
* the timestamp to use for the signature. 0 means "now" */
int
make_keysig_packet( PKT_signature **ret_sig, PKT_public_key *pk,
PKT_user_id *uid, PKT_public_key *subpk,
PKT_secret_key *sk,
int sigclass, int digest_algo,
int sigversion, u32 timestamp, u32 duration,
int (*mksubpkt)(PKT_signature *, void *), void *opaque
)
{
PKT_signature *sig;
int rc=0;
MD_HANDLE md;
assert( (sigclass >= 0x10 && sigclass <= 0x13)
|| sigclass == 0x20 || sigclass == 0x18
|| sigclass == 0x30 || sigclass == 0x28 );
if (opt.force_v4_certs)
sigversion = 4;
if (sigversion < sk->version)
sigversion = sk->version;
/* If you are making a signature on a v4 key using your v3 key, it
doesn't make sense to generate a v3 sig. After all, no v3-only
PGP implementation could understand the v4 key in the first
place. */
if (sigversion < pk->version)
sigversion = pk->version;
if( !digest_algo ) {
switch( sk->pubkey_algo ) {
case PUBKEY_ALGO_DSA:
digest_algo = DIGEST_ALGO_SHA1;
break;
case PUBKEY_ALGO_RSA_S:
case PUBKEY_ALGO_RSA:
if (opt.force_v4_certs || sk->version > 3)
digest_algo = DIGEST_ALGO_SHA1;
else
digest_algo = DIGEST_ALGO_MD5;
break;
default:
digest_algo = DIGEST_ALGO_RMD160;
break;
}
}
md = md_open( digest_algo, 0 );
/* hash the public key certificate and the user id */
hash_public_key( md, pk );
if( sigclass == 0x18 || sigclass == 0x28 ) { /* subkey binding/revocation*/
hash_public_key( md, subpk );
}
else if( sigclass != 0x20 ) {
hash_uid (md, sigversion, uid);
}
/* and make the signature packet */
sig = m_alloc_clear( sizeof *sig );
sig->version = sigversion;
sig->flags.exportable=1;
sig->flags.revocable=1;
keyid_from_sk( sk, sig->keyid );
sig->pubkey_algo = sk->pubkey_algo;
sig->digest_algo = digest_algo;
if(timestamp)
sig->timestamp=timestamp;
else
sig->timestamp=make_timestamp();
if(duration)
sig->expiredate=sig->timestamp+duration;
sig->sig_class = sigclass;
if( sig->version >= 4 )
build_sig_subpkt_from_sig( sig );
if( sig->version >= 4 && mksubpkt )
rc = (*mksubpkt)( sig, opaque );
if( !rc ) {
mk_notation_and_policy( sig, pk );
hash_sigversion_to_magic (md, sig);
md_final(md);
rc = complete_sig( sig, sk, md );
}
md_close( md );
if( rc )
free_seckey_enc( sig );
else
*ret_sig = sig;
return rc;
}
/****************
* Create a new signature packet based on an existing one.
* Only user ID signatures are supported for now.
* TODO: Merge this with make_keysig_packet.
*/
int
update_keysig_packet( PKT_signature **ret_sig,
PKT_signature *orig_sig,
PKT_public_key *pk,
PKT_user_id *uid,
PKT_secret_key *sk,
int (*mksubpkt)(PKT_signature *, void *),
void *opaque
)
{
PKT_signature *sig;
int rc=0;
MD_HANDLE md;
if (!orig_sig || !pk || !uid || !sk)
return G10ERR_GENERAL;
if (orig_sig->sig_class < 0x10 || orig_sig->sig_class > 0x13 )
return G10ERR_GENERAL;
md = md_open( orig_sig->digest_algo, 0 );
/* hash the public key certificate and the user id */
hash_public_key( md, pk );
hash_uid (md, orig_sig->version, uid);
/* create a new signature packet */
sig = copy_signature (NULL, orig_sig);
if ( sig->version >= 4 && mksubpkt)
rc = (*mksubpkt)(sig, opaque);
/* we increase the timestamp by one second so that a future import
of this key will replace the existing one. We also make sure that
we don't create a timestamp in the future */
sig->timestamp++;
while (sig->timestamp >= make_timestamp())
sleep (1);
/* put the updated timestamp back into the data */
if( sig->version >= 4 )
build_sig_subpkt_from_sig( sig );
if (!rc) {
hash_sigversion_to_magic (md, sig);
md_final(md);
rc = complete_sig( sig, sk, md );
}
md_close (md);
if( rc )
free_seckey_enc (sig);
else
*ret_sig = sig;
return rc;
}
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