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gnupg/sm/sign.c

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/* sign.c - Sign a message
* Copyright (C) 2001, 2002, 2003, 2008,
* 2010 Free Software Foundation, Inc.
* Copyright (C) 2003-2012, 2016-2017, 2019,
* 2020, 2022-2023 g10 Code GmbH
*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include "gpgsm.h"
#include <gcrypt.h>
#include <ksba.h>
#include "keydb.h"
#include "../common/i18n.h"
#include "../common/tlv.h"
/* Hash the data and return if something was hashed. Return -1 on error. */
static int
hash_data (estream_t fp, gcry_md_hd_t md)
{
char buffer[4096];
int nread;
int rc = 0;
do
{
nread = es_fread (buffer, 1, DIM(buffer), fp);
gcry_md_write (md, buffer, nread);
}
while (nread);
if (es_ferror (fp))
{
log_error ("read error on fd %p: %s\n", fp, strerror (errno));
rc = -1;
}
return rc;
}
static int
hash_and_copy_data (estream_t fp, gcry_md_hd_t md, ksba_writer_t writer)
{
gpg_error_t err;
char buffer[4096];
int nread;
int rc = 0;
int any = 0;
do
{
nread = es_fread (buffer, 1, DIM(buffer), fp);
if (nread)
{
any = 1;
gcry_md_write (md, buffer, nread);
err = ksba_writer_write_octet_string (writer, buffer, nread, 0);
if (err)
{
log_error ("write failed: %s\n", gpg_strerror (err));
rc = err;
}
}
}
while (nread && !rc);
if (es_ferror (fp))
{
rc = gpg_error_from_syserror ();
log_error ("read error on fp %p: %s\n", fp, strerror (errno));
}
if (!any)
{
/* We can't allow signing an empty message because it does not
make much sense and more seriously, ksba_cms_build has
already written the tag for data and now expects an octet
string and an octet string of size 0 is illegal. */
log_error ("cannot sign an empty message\n");
rc = gpg_error (GPG_ERR_NO_DATA);
}
if (!rc)
{
err = ksba_writer_write_octet_string (writer, NULL, 0, 1);
if (err)
{
log_error ("write failed: %s\n", gpg_strerror (err));
rc = err;
}
}
return rc;
}
/* Get the default certificate which is defined as the first
certificate capable of signing returned by the keyDB and has a
secret key available. */
int
gpgsm_get_default_cert (ctrl_t ctrl, ksba_cert_t *r_cert)
{
KEYDB_HANDLE hd;
ksba_cert_t cert = NULL;
int rc;
char *p;
hd = keydb_new (ctrl);
if (!hd)
return gpg_error (GPG_ERR_GENERAL);
rc = keydb_search_first (ctrl, hd);
if (rc)
{
keydb_release (hd);
return rc;
}
do
{
rc = keydb_get_cert (hd, &cert);
if (rc)
{
log_error ("keydb_get_cert failed: %s\n", gpg_strerror (rc));
keydb_release (hd);
return rc;
}
if (!gpgsm_cert_use_sign_p (cert, 1))
{
p = gpgsm_get_keygrip_hexstring (cert);
if (p)
{
if (!gpgsm_agent_havekey (ctrl, p))
{
xfree (p);
keydb_release (hd);
*r_cert = cert;
return 0; /* got it */
}
xfree (p);
}
}
ksba_cert_release (cert);
cert = NULL;
}
while (!(rc = keydb_search_next (ctrl, hd)));
if (rc && rc != -1)
log_error ("keydb_search_next failed: %s\n", gpg_strerror (rc));
ksba_cert_release (cert);
keydb_release (hd);
return rc;
}
static ksba_cert_t
get_default_signer (ctrl_t ctrl)
{
KEYDB_SEARCH_DESC desc;
ksba_cert_t cert = NULL;
KEYDB_HANDLE kh = NULL;
int rc;
if (!opt.local_user)
{
rc = gpgsm_get_default_cert (ctrl, &cert);
if (rc)
{
if (rc != -1)
log_debug ("failed to find default certificate: %s\n",
gpg_strerror (rc));
return NULL;
}
return cert;
}
rc = classify_user_id (opt.local_user, &desc, 0);
if (rc)
{
log_error ("failed to find default signer: %s\n", gpg_strerror (rc));
return NULL;
}
kh = keydb_new (ctrl);
if (!kh)
return NULL;
rc = keydb_search (ctrl, kh, &desc, 1);
if (rc)
{
log_debug ("failed to find default certificate: rc=%d\n", rc);
}
else
{
rc = keydb_get_cert (kh, &cert);
if (rc)
{
log_debug ("failed to get cert: rc=%d\n", rc);
}
}
keydb_release (kh);
return cert;
}
/* Depending on the options in CTRL add the certificate CERT as well as
other certificate up in the chain to the Root-CA to the CMS
object. */
static int
add_certificate_list (ctrl_t ctrl, ksba_cms_t cms, ksba_cert_t cert)
{
gpg_error_t err;
int rc = 0;
ksba_cert_t next = NULL;
int n;
int not_root = 0;
ksba_cert_ref (cert);
n = ctrl->include_certs;
if (n == -2)
{
not_root = 1;
n = -1;
}
if (n < 0 || n > 50)
n = 50; /* We better apply an upper bound */
/* First add my own certificate unless we don't want any certificate
included at all. */
if (n)
{
if (not_root && gpgsm_is_root_cert (cert))
err = 0;
else
err = ksba_cms_add_cert (cms, cert);
if (err)
goto ksba_failure;
if (n>0)
n--;
}
/* Walk the chain to include all other certificates. Note that a -1
used for N makes sure that there is no limit and all certs get
included. */
while ( n-- && !(rc = gpgsm_walk_cert_chain (ctrl, cert, &next)) )
{
if (not_root && gpgsm_is_root_cert (next))
err = 0;
else
err = ksba_cms_add_cert (cms, next);
ksba_cert_release (cert);
cert = next; next = NULL;
if (err)
goto ksba_failure;
}
ksba_cert_release (cert);
return gpg_err_code (rc) == GPG_ERR_NOT_FOUND? 0 : rc;
ksba_failure:
ksba_cert_release (cert);
log_error ("ksba_cms_add_cert failed: %s\n", gpg_strerror (err));
return err;
}
static gpg_error_t
add_signed_attribute (ksba_cms_t cms, const char *attrstr)
{
gpg_error_t err;
char **fields = NULL;
const char *s;
int i;
unsigned char *der = NULL;
size_t derlen;
fields = strtokenize (attrstr, ":");
if (!fields)
{
err = gpg_error_from_syserror ();
log_error ("strtokenize failed: %s\n", gpg_strerror (err));
goto leave;
}
for (i=0; fields[i]; i++)
;
if (i != 3)
{
err = gpg_error (GPG_ERR_SYNTAX);
log_error ("invalid attribute specification '%s': %s\n",
attrstr, i < 3 ? "not enough fields":"too many fields");
goto leave;
}
if (!ascii_strcasecmp (fields[1], "u"))
{
err = 0;
goto leave; /* Skip unsigned attributes. */
}
if (ascii_strcasecmp (fields[1], "s"))
{
err = gpg_error (GPG_ERR_SYNTAX);
log_error ("invalid attribute specification '%s': %s\n",
attrstr, "type is not 's' or 'u'");
goto leave;
}
/* Check that the OID is valid. */
err = ksba_oid_from_str (fields[0], &der, &derlen);
if (err)
{
log_error ("invalid attribute specification '%s': %s\n",
attrstr, gpg_strerror (err));
goto leave;
}
xfree (der);
der = NULL;
if (strchr (fields[2], '/'))
{
/* FIXME: read from file. */
}
else /* Directly given in hex. */
{
for (i=0, s = fields[2]; hexdigitp (s); s++, i++)
;
if (*s || !i || (i&1))
{
log_error ("invalid attribute specification '%s': %s\n",
attrstr, "invalid hex encoding of the data");
err = gpg_error (GPG_ERR_SYNTAX);
goto leave;
}
der = xtrystrdup (fields[2]);
if (!der)
{
err = gpg_error_from_syserror ();
log_error ("malloc failed: %s\n", gpg_strerror (err));
goto leave;
}
for (s=fields[2], derlen=0; s[0] && s[1]; s += 2)
der[derlen++] = xtoi_2 (s);
}
/* Store the data in the CMS object for all signers. */
#if 0
err = ksba_cms_add_attribute (cms, -1, fields[0], 0, der, derlen);
#else
(void)cms;
err = gpg_error (GPG_ERR_NOT_IMPLEMENTED);
#endif
if (err)
{
log_error ("invalid attribute specification '%s': %s\n",
attrstr, gpg_strerror (err));
goto leave;
}
leave:
xfree (der);
xfree (fields);
return err;
}
/* This function takes a binary detached signature in (BLOB,BLOBLEN)
* and writes it to OUT_FP. The core of the function is to replace
* NDEF length sequences in the input to those with fixed inputs.
* This helps certain other implementations to properly verify
* detached signature. Moreover, it allows our own trailing zero
* stripping code - which we need for PDF signatures - to work
* correctly.
*
* Example start of a detached signature as created by us:
* 0 NDEF: SEQUENCE { -- 1st sequence
* 2 9: OBJECT IDENTIFIER signedData (1 2 840 113549 1 7 2)
* 13 NDEF: [0] { -- 2nd sequence
* 15 NDEF: SEQUENCE { -- 3rd sequence
* 17 1: INTEGER 1 -- version
* 20 15: SET { -- set of algorithms
* 22 13: SEQUENCE {
* 24 9: OBJECT IDENTIFIER sha-256 (2 16 840 1 101 3 4 2 1)
* 35 0: NULL
* : }
* : }
* 37 NDEF: SEQUENCE { -- 4th pretty short sequence
* 39 9: OBJECT IDENTIFIER data (1 2 840 113549 1 7 1)
* : }
* 52 869: [0] {
* Our goal is to replace the NDEF by fixed length tags.
*/
static gpg_error_t
write_detached_signature (ctrl_t ctrl, const void *blob, size_t bloblen,
estream_t out_fp)
{
gpg_error_t err;
const unsigned char *p;
size_t n, objlen, hdrlen;
int class, tag, cons, ndef;
const unsigned char *p_ctoid, *p_version, *p_algoset, *p_dataoid;
size_t n_ctoid, n_version, n_algoset, n_dataoid;
const unsigned char *p_certset, *p_signerinfos;
size_t n_certset, n_signerinfos;
int i;
ksba_der_t dbld;
unsigned char *finalder = NULL;
size_t finalderlen;
(void)ctrl;
p = blob;
n = bloblen;
if ((err=parse_ber_header (&p,&n,&class,&tag,&cons,&ndef,&objlen,&hdrlen)))
return err;
if (!(class == CLASS_UNIVERSAL && tag == TAG_SEQUENCE && cons))
return gpg_error (GPG_ERR_INV_CMS_OBJ); /* No 1st sequence. */
if ((err=parse_ber_header (&p,&n,&class,&tag,&cons,&ndef,&objlen,&hdrlen)))
return err;
if (!(class == CLASS_UNIVERSAL && tag == TAG_OBJECT_ID && !cons))
return gpg_error (GPG_ERR_INV_CMS_OBJ); /* No signedData OID. */
if (objlen > n)
return gpg_error (GPG_ERR_BAD_BER); /* Object larger than data. */
p_ctoid = p;
n_ctoid = objlen;
p += objlen;
n -= objlen;
if ((err=parse_ber_header (&p,&n,&class,&tag,&cons,&ndef,&objlen,&hdrlen)))
return err;
if (!(class == CLASS_CONTEXT && tag == 0 && cons))
return gpg_error (GPG_ERR_INV_CMS_OBJ); /* No 2nd sequence. */
if ((err=parse_ber_header (&p,&n,&class,&tag,&cons,&ndef,&objlen,&hdrlen)))
return err;
if (!(class == CLASS_UNIVERSAL && tag == TAG_SEQUENCE && cons))
return gpg_error (GPG_ERR_INV_CMS_OBJ); /* No 3rd sequence. */
if ((err=parse_ber_header (&p,&n,&class,&tag,&cons,&ndef,&objlen,&hdrlen)))
return err;
if (!(class == CLASS_UNIVERSAL && tag == TAG_INTEGER))
return gpg_error (GPG_ERR_INV_CMS_OBJ); /* No version. */
if (objlen > n)
return gpg_error (GPG_ERR_BAD_BER); /* Object larger than data. */
p_version = p;
n_version = objlen;
p += objlen;
n -= objlen;
p_algoset = p;
if ((err=parse_ber_header (&p,&n,&class,&tag,&cons,&ndef,&objlen,&hdrlen)))
return err;
if (!(class == CLASS_UNIVERSAL && tag == TAG_SET && cons && !ndef))
return gpg_error (GPG_ERR_INV_CMS_OBJ); /* No set of algorithms. */
if (objlen > n)
return gpg_error (GPG_ERR_BAD_BER); /* Object larger than data. */
n_algoset = hdrlen + objlen;
p += objlen;
n -= objlen;
if ((err=parse_ber_header (&p,&n,&class,&tag,&cons,&ndef,&objlen,&hdrlen)))
return err;
if (!(class == CLASS_UNIVERSAL && tag == TAG_SEQUENCE && cons))
return gpg_error (GPG_ERR_INV_CMS_OBJ); /* No 4th sequence. */
if ((err=parse_ber_header (&p,&n,&class,&tag,&cons,&ndef,&objlen,&hdrlen)))
return err;
if (!(class == CLASS_UNIVERSAL && tag == TAG_OBJECT_ID && !cons))
return gpg_error (GPG_ERR_INV_CMS_OBJ); /* No data OID. */
if (objlen > n)
return gpg_error (GPG_ERR_BAD_BER); /* Object larger than data. */
p_dataoid = p;
n_dataoid = objlen;
p += objlen;
n -= objlen;
if ((err=parse_ber_header (&p,&n,&class,&tag,&cons,&ndef,&objlen,&hdrlen)))
return err;
if (!(class == CLASS_UNIVERSAL && tag == TAG_NONE && !cons && !objlen))
return gpg_error (GPG_ERR_INV_CMS_OBJ); /* No End tag. */
/* certificates [0] IMPLICIT CertificateSet OPTIONAL,
* Note: We ignore the following
* crls [1] IMPLICIT CertificateRevocationLists OPTIONAL
* because gpgsm does not create them. */
if ((err=parse_ber_header (&p,&n,&class,&tag,&cons,&ndef,&objlen,&hdrlen)))
return err;
if (class == CLASS_CONTEXT && tag == 0 && cons)
{
if (objlen > n)
return gpg_error (GPG_ERR_BAD_BER); /* Object larger than data. */
p_certset = p;
n_certset = objlen;
p += objlen;
n -= objlen;
if ((err=parse_ber_header (&p,&n,&class,&tag,&cons,&ndef,
&objlen,&hdrlen)))
return err;
}
else
{
p_certset = NULL;
n_certset = 0;
}
/* SignerInfos ::= SET OF SignerInfo */
if (!(class == CLASS_UNIVERSAL && tag == TAG_SET && cons && !ndef))
return gpg_error (GPG_ERR_INV_CMS_OBJ); /* No set of signerInfos. */
if (objlen > n)
return gpg_error (GPG_ERR_BAD_BER); /* Object larger than data. */
p_signerinfos = p;
n_signerinfos = objlen;
p += objlen;
n -= objlen;
/* For the fun of it check the 3 end tags. */
for (i=0; i < 3; i++)
{
if ((err=parse_ber_header (&p,&n,&class,&tag,&cons,&ndef,
&objlen,&hdrlen)))
return err;
if (!(class == CLASS_UNIVERSAL && tag == TAG_NONE && !cons && !objlen))
return gpg_error (GPG_ERR_INV_CMS_OBJ); /* No End tag. */
}
if (n)
return gpg_error (GPG_ERR_INV_CMS_OBJ); /* Garbage */
/*---- From here on we jump to leave on error. ----*/
/* Now create a new object from the collected data. */
dbld = ksba_der_builder_new (16); /* (pre-allocate 16 items) */
if (!dbld)
{
err = gpg_error_from_syserror ();
goto leave;
}
ksba_der_add_tag (dbld, 0, KSBA_TYPE_SEQUENCE);
ksba_der_add_val ( dbld, 0, KSBA_TYPE_OBJECT_ID, p_ctoid, n_ctoid);
ksba_der_add_tag ( dbld, KSBA_CLASS_CONTEXT, 0);
ksba_der_add_tag ( dbld, 0, KSBA_TYPE_SEQUENCE);
ksba_der_add_val ( dbld, 0, KSBA_TYPE_INTEGER, p_version, n_version);
ksba_der_add_der ( dbld, p_algoset, n_algoset);
ksba_der_add_tag ( dbld, 0, KSBA_TYPE_SEQUENCE);
ksba_der_add_val ( dbld, 0, KSBA_TYPE_OBJECT_ID, p_dataoid, n_dataoid);
ksba_der_add_end ( dbld);
if (p_certset)
{
ksba_der_add_tag ( dbld, KSBA_CLASS_CONTEXT, 0);
ksba_der_add_der ( dbld, p_certset, n_certset);
ksba_der_add_end ( dbld);
}
ksba_der_add_tag ( dbld, 0, KSBA_TYPE_SET);
ksba_der_add_der ( dbld, p_signerinfos, n_signerinfos);
ksba_der_add_end ( dbld);
ksba_der_add_end ( dbld);
ksba_der_add_end ( dbld);
ksba_der_add_end (dbld);
err = ksba_der_builder_get (dbld, &finalder, &finalderlen);
if (err)
goto leave;
if (es_fwrite (finalder, finalderlen, 1, out_fp) != 1)
{
err = gpg_error_from_syserror ();
goto leave;
}
leave:
ksba_der_release (dbld);
ksba_free (finalder);
return err;
}
/* Perform a sign operation.
Sign the data received on DATA-FD in embedded mode or in detached
mode when DETACHED is true. Write the signature to OUT_FP. The
keys used to sign are taken from SIGNERLIST or the default one will
be used if the value of this argument is NULL. */
int
gpgsm_sign (ctrl_t ctrl, certlist_t signerlist,
estream_t data_fp, int detached, estream_t out_fp)
{
gpg_error_t err;
int i;
gnupg_ksba_io_t b64writer = NULL;
ksba_writer_t writer;
estream_t sig_fp = NULL; /* Used for detached signatures. */
ksba_cms_t cms = NULL;
ksba_stop_reason_t stopreason;
KEYDB_HANDLE kh = NULL;
gcry_md_hd_t data_md = NULL;
int signer;
const char *algoid;
int algo;
ksba_isotime_t signed_at;
certlist_t cl;
int release_signerlist = 0;
int binary_detached = detached && !ctrl->create_pem && !ctrl->create_base64;
char *curve = NULL;
audit_set_type (ctrl->audit, AUDIT_TYPE_SIGN);
kh = keydb_new (ctrl);
if (!kh)
{
log_error (_("failed to allocate keyDB handle\n"));
err = gpg_error (GPG_ERR_GENERAL);
goto leave;
}
if (!gnupg_rng_is_compliant (opt.compliance))
{
err = gpg_error (GPG_ERR_FORBIDDEN);
log_error (_("%s is not compliant with %s mode\n"),
"RNG",
gnupg_compliance_option_string (opt.compliance));
gpgsm_status_with_error (ctrl, STATUS_ERROR,
"random-compliance", err);
goto leave;
}
/* Note that in detached mode the b64 write is actually a binary
* writer because we need to fixup the created signature later.
* Note that we do this only for binary output because we have no
* PEM writer interface outside of the ksba create writer code. */
ctrl->pem_name = "SIGNED MESSAGE";
if (binary_detached)
{
sig_fp = es_fopenmem (0, "w+");
err = sig_fp? 0 : gpg_error_from_syserror ();
if (!err)
err = gnupg_ksba_create_writer (&b64writer, 0, NULL, sig_fp, &writer);
}
else
{
err = gnupg_ksba_create_writer
(&b64writer, ((ctrl->create_pem? GNUPG_KSBA_IO_PEM : 0)
| (ctrl->create_base64? GNUPG_KSBA_IO_BASE64 : 0)),
ctrl->pem_name, out_fp, &writer);
}
if (err)
{
log_error ("can't create writer: %s\n", gpg_strerror (err));
goto leave;
}
gnupg_ksba_set_progress_cb (b64writer, gpgsm_progress_cb, ctrl);
if (ctrl->input_size_hint)
gnupg_ksba_set_total (b64writer, ctrl->input_size_hint);
err = ksba_cms_new (&cms);
if (err)
goto leave;
err = ksba_cms_set_reader_writer (cms, NULL, writer);
if (err)
{
log_debug ("ksba_cms_set_reader_writer failed: %s\n",
gpg_strerror (err));
goto leave;
}
/* We are going to create signed data with data as encap. content.
* In authenticode mode we use spcIndirectDataContext instead. */
err = ksba_cms_set_content_type (cms, 0, KSBA_CT_SIGNED_DATA);
if (!err)
err = ksba_cms_set_content_type
(cms, 1,
opt.authenticode? KSBA_CT_SPC_IND_DATA_CTX :
KSBA_CT_DATA
);
if (err)
{
log_debug ("ksba_cms_set_content_type failed: %s\n",
gpg_strerror (err));
goto leave;
}
/* If no list of signers is given, use the default certificate. */
if (!signerlist)
{
ksba_cert_t cert = get_default_signer (ctrl);
if (!cert)
{
log_error ("no default signer found\n");
gpgsm_status2 (ctrl, STATUS_INV_SGNR,
get_inv_recpsgnr_code (GPG_ERR_NO_SECKEY), NULL);
err = gpg_error (GPG_ERR_GENERAL);
goto leave;
}
/* Although we don't check for ambiguous specification we will
check that the signer's certificate is usable and valid. */
err = gpgsm_cert_use_sign_p (cert, 0);
if (!err)
err = gpgsm_validate_chain (ctrl, cert,
GNUPG_ISOTIME_NONE, NULL, 0, NULL, 0, NULL);
if (err)
{
char *tmpfpr;
tmpfpr = gpgsm_get_fingerprint_hexstring (cert, 0);
gpgsm_status2 (ctrl, STATUS_INV_SGNR,
get_inv_recpsgnr_code (err), tmpfpr, NULL);
xfree (tmpfpr);
goto leave;
}
/* That one is fine - create signerlist. */
signerlist = xtrycalloc (1, sizeof *signerlist);
if (!signerlist)
{
err = gpg_error_from_syserror ();
ksba_cert_release (cert);
goto leave;
}
signerlist->cert = cert;
release_signerlist = 1;
}
/* Figure out the hash algorithm to use. We do not want to use the
one for the certificate but if possible an OID for the plain
algorithm. */
if (opt.forced_digest_algo && opt.verbose)
log_info ("user requested hash algorithm %d\n", opt.forced_digest_algo);
for (i=0, cl=signerlist; cl; cl = cl->next, i++)
{
const char *oid;
unsigned int nbits;
int pk_algo;
xfree (curve);
pk_algo = gpgsm_get_key_algo_info (cl->cert, &nbits, &curve);
cl->pk_algo = pk_algo;
if (opt.forced_digest_algo)
{
oid = NULL;
cl->hash_algo = opt.forced_digest_algo;
}
else
{
if (pk_algo == GCRY_PK_ECC)
{
/* Map the Curve to a corresponding hash algo. */
if (nbits <= 256)
oid = "2.16.840.1.101.3.4.2.1"; /* sha256 */
else if (nbits <= 384)
oid = "2.16.840.1.101.3.4.2.2"; /* sha384 */
else
oid = "2.16.840.1.101.3.4.2.3"; /* sha512 */
}
else
{
/* For RSA we reuse the hash algo used by the certificate. */
oid = ksba_cert_get_digest_algo (cl->cert);
}
cl->hash_algo = oid ? gcry_md_map_name (oid) : 0;
}
switch (cl->hash_algo)
{
case GCRY_MD_SHA1: oid = "1.3.14.3.2.26"; break;
case GCRY_MD_RMD160: oid = "1.3.36.3.2.1"; break;
case GCRY_MD_SHA224: oid = "2.16.840.1.101.3.4.2.4"; break;
case GCRY_MD_SHA256: oid = "2.16.840.1.101.3.4.2.1"; break;
case GCRY_MD_SHA384: oid = "2.16.840.1.101.3.4.2.2"; break;
case GCRY_MD_SHA512: oid = "2.16.840.1.101.3.4.2.3"; break;
/* case GCRY_MD_WHIRLPOOL: oid = "No OID yet"; break; */
case GCRY_MD_MD5: /* We don't want to use MD5. */
case 0: /* No algorithm found in cert. */
default: /* Other algorithms. */
log_info (_("hash algorithm %d (%s) for signer %d not supported;"
" using %s\n"),
cl->hash_algo, oid? oid: "?", i,
gcry_md_algo_name (GCRY_MD_SHA1));
cl->hash_algo = GCRY_MD_SHA1;
oid = "1.3.14.3.2.26";
break;
}
cl->hash_algo_oid = oid;
/* Check compliance. */
if (! gnupg_digest_is_allowed (opt.compliance, 1, cl->hash_algo))
{
log_error (_("digest algorithm '%s' may not be used in %s mode\n"),
gcry_md_algo_name (cl->hash_algo),
gnupg_compliance_option_string (opt.compliance));
err = gpg_error (GPG_ERR_DIGEST_ALGO);
goto leave;
}
if (!gnupg_pk_is_allowed (opt.compliance, PK_USE_SIGNING, pk_algo,
PK_ALGO_FLAG_ECC18, NULL, nbits, curve))
{
char kidstr[10+1];
snprintf (kidstr, sizeof kidstr, "0x%08lX",
gpgsm_get_short_fingerprint (cl->cert, NULL));
log_error (_("key %s may not be used for signing in %s mode\n"),
kidstr,
gnupg_compliance_option_string (opt.compliance));
err = gpg_error (GPG_ERR_PUBKEY_ALGO);
goto leave;
}
}
if (opt.verbose > 1 || opt.debug)
{
for (i=0, cl=signerlist; cl; cl = cl->next, i++)
log_info (_("hash algorithm used for signer %d: %s (%s)\n"),
i, gcry_md_algo_name (cl->hash_algo), cl->hash_algo_oid);
}
/* Gather certificates of signers and store them in the CMS object. */
for (cl=signerlist; cl; cl = cl->next)
{
err = gpgsm_cert_use_sign_p (cl->cert, 0);
if (err)
goto leave;
err = ksba_cms_add_signer (cms, cl->cert);
if (err)
{
log_error ("ksba_cms_add_signer failed: %s\n", gpg_strerror (err));
goto leave;
}
err = add_certificate_list (ctrl, cms, cl->cert);
if (err)
{
log_error ("failed to store list of certificates: %s\n",
gpg_strerror (err));
goto leave;
}
/* Set the hash algorithm we are going to use */
err = ksba_cms_add_digest_algo (cms, cl->hash_algo_oid);
if (err)
{
log_debug ("ksba_cms_add_digest_algo failed: %s\n",
gpg_strerror (err));
goto leave;
}
}
/* Check whether one of the certificates is qualified. Note that we
already validated the certificate and thus the user data stored
flag must be available. */
if (!opt.no_chain_validation)
{
for (cl=signerlist; cl; cl = cl->next)
{
size_t buflen;
char buffer[1];
err = ksba_cert_get_user_data (cl->cert, "is_qualified",
&buffer, sizeof (buffer), &buflen);
if (err || !buflen)
{
log_error (_("checking for qualified certificate failed: %s\n"),
gpg_strerror (err));
goto leave;
}
if (*buffer)
err = gpgsm_qualified_consent (ctrl, cl->cert);
else
err = gpgsm_not_qualified_warning (ctrl, cl->cert);
if (err)
goto leave;
}
}
/* Prepare hashing (actually we are figuring out what we have set
above). */
err = gcry_md_open (&data_md, 0, 0);
if (err)
{
log_error ("md_open failed: %s\n", gpg_strerror (err));
goto leave;
}
if (DBG_HASHING)
gcry_md_debug (data_md, "sign.data");
for (i=0; (algoid=ksba_cms_get_digest_algo_list (cms, i)); i++)
{
algo = gcry_md_map_name (algoid);
if (!algo)
{
log_error ("unknown hash algorithm '%s'\n", algoid? algoid:"?");
err = gpg_error (GPG_ERR_BUG);
goto leave;
}
gcry_md_enable (data_md, algo);
audit_log_i (ctrl->audit, AUDIT_DATA_HASH_ALGO, algo);
}
audit_log (ctrl->audit, AUDIT_SETUP_READY);
if (detached)
{ /* We hash the data right now so that we can store the message
digest. ksba_cms_build() takes this as an flag that detached
data is expected. */
unsigned char *digest;
size_t digest_len;
if (!hash_data (data_fp, data_md))
audit_log (ctrl->audit, AUDIT_GOT_DATA);
for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
{
digest = gcry_md_read (data_md, cl->hash_algo);
digest_len = gcry_md_get_algo_dlen (cl->hash_algo);
if ( !digest || !digest_len )
{
log_error ("problem getting the hash of the data\n");
err = gpg_error (GPG_ERR_BUG);
goto leave;
}
err = ksba_cms_set_message_digest (cms, signer, digest, digest_len);
if (err)
{
log_error ("ksba_cms_set_message_digest failed: %s\n",
gpg_strerror (err));
goto leave;
}
}
}
gnupg_get_isotime (signed_at);
for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
{
err = ksba_cms_set_signing_time (cms, signer, signed_at);
if (err)
{
log_error ("ksba_cms_set_signing_time failed: %s\n",
gpg_strerror (err));
goto leave;
}
}
{
strlist_t sl;
for (sl = opt.attributes; sl; sl = sl->next)
if ((err = add_signed_attribute (cms, sl->d)))
goto leave;
}
/* We need to write at least a minimal list of our capabilities to
* try to convince some MUAs to use 3DES and not the crippled
* RC2. Our list is:
*
* aes256-CBC
* aes128-CBC
* des-EDE3-CBC
*/
err = ksba_cms_add_smime_capability (cms, "2.16.840.1.101.3.4.1.42", NULL,0);
if (!err)
err = ksba_cms_add_smime_capability (cms, "2.16.840.1.101.3.4.1.2", NULL,0);
if (!err)
err = ksba_cms_add_smime_capability (cms, "1.2.840.113549.3.7", NULL, 0);
if (err)
{
log_error ("ksba_cms_add_smime_capability failed: %s\n",
gpg_strerror (err));
goto leave;
}
/* Main building loop. */
do
{
err = ksba_cms_build (cms, &stopreason);
if (err)
{
log_error ("creating CMS object failed: %s\n", gpg_strerror (err));
goto leave;
}
if (stopreason == KSBA_SR_BEGIN_DATA)
{
/* Hash the data and store the message digest. */
unsigned char *digest;
size_t digest_len;
log_assert (!detached);
err = hash_and_copy_data (data_fp, data_md, writer);
if (err)
goto leave;
audit_log (ctrl->audit, AUDIT_GOT_DATA);
for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
{
digest = gcry_md_read (data_md, cl->hash_algo);
digest_len = gcry_md_get_algo_dlen (cl->hash_algo);
if ( !digest || !digest_len )
{
log_error ("problem getting the hash of the data\n");
err = gpg_error (GPG_ERR_BUG);
goto leave;
}
err = ksba_cms_set_message_digest (cms, signer,
digest, digest_len);
if (err)
{
log_error ("ksba_cms_set_message_digest failed: %s\n",
gpg_strerror (err));
goto leave;
}
}
}
else if (stopreason == KSBA_SR_NEED_SIG)
{
/* Compute the signature for all signers. */
gcry_md_hd_t md;
err = gcry_md_open (&md, 0, 0);
if (err)
{
log_error ("md_open failed: %s\n", gpg_strerror (err));
goto leave;
}
if (DBG_HASHING)
gcry_md_debug (md, "sign.attr");
ksba_cms_set_hash_function (cms, HASH_FNC, md);
for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
{
unsigned char *sigval = NULL;
char *buf, *fpr;
audit_log_i (ctrl->audit, AUDIT_NEW_SIG, signer);
if (signer)
gcry_md_reset (md);
{
certlist_t cl_tmp;
for (cl_tmp=signerlist; cl_tmp; cl_tmp = cl_tmp->next)
{
gcry_md_enable (md, cl_tmp->hash_algo);
audit_log_i (ctrl->audit, AUDIT_ATTR_HASH_ALGO,
cl_tmp->hash_algo);
}
}
err = ksba_cms_hash_signed_attrs (cms, signer);
if (err)
{
log_debug ("hashing signed attrs failed: %s\n",
gpg_strerror (err));
gcry_md_close (md);
goto leave;
}
err = gpgsm_create_cms_signature (ctrl, cl->cert,
md, cl->hash_algo, &sigval);
if (err)
{
audit_log_cert (ctrl->audit, AUDIT_SIGNED_BY, cl->cert, err);
gcry_md_close (md);
goto leave;
}
err = ksba_cms_set_sig_val (cms, signer, sigval);
xfree (sigval);
if (err)
{
audit_log_cert (ctrl->audit, AUDIT_SIGNED_BY, cl->cert, err);
log_error ("failed to store the signature: %s\n",
gpg_strerror (err));
gcry_md_close (md);
goto leave;
}
/* write a status message */
fpr = gpgsm_get_fingerprint_hexstring (cl->cert, GCRY_MD_SHA1);
if (!fpr)
{
err = gpg_error (GPG_ERR_ENOMEM);
gcry_md_close (md);
goto leave;
}
if (opt.verbose)
{
char *pkalgostr = gpgsm_pubkey_algo_string (cl->cert, NULL);
log_info (_("%s/%s signature using %s key %s\n"),
pubkey_algo_to_string (cl->pk_algo),
gcry_md_algo_name (cl->hash_algo),
pkalgostr, fpr);
xfree (pkalgostr);
}
buf = xtryasprintf ("%c %d %d 00 %s %s",
detached? 'D':'S',
cl->pk_algo,
cl->hash_algo,
signed_at,
fpr);
if (!buf)
err = gpg_error_from_syserror ();
xfree (fpr);
if (err)
{
gcry_md_close (md);
goto leave;
}
gpgsm_status (ctrl, STATUS_SIG_CREATED, buf);
xfree (buf);
audit_log_cert (ctrl->audit, AUDIT_SIGNED_BY, cl->cert, 0);
}
gcry_md_close (md);
}
}
while (stopreason != KSBA_SR_READY);
err = gnupg_ksba_finish_writer (b64writer);
if (err)
{
log_error ("write failed: %s\n", gpg_strerror (err));
goto leave;
}
if (binary_detached)
{
void *blob = NULL;
size_t bloblen;
err = (es_fclose_snatch (sig_fp, &blob, &bloblen)?
gpg_error_from_syserror () : 0);
sig_fp = NULL;
if (err)
goto leave;
err = write_detached_signature (ctrl, blob, bloblen, out_fp);
xfree (blob);
if (err)
goto leave;
}
audit_log (ctrl->audit, AUDIT_SIGNING_DONE);
log_info ("signature created\n");
leave:
if (err)
log_error ("error creating signature: %s <%s>\n",
gpg_strerror (err), gpg_strsource (err) );
if (release_signerlist)
gpgsm_release_certlist (signerlist);
xfree (curve);
ksba_cms_release (cms);
gnupg_ksba_destroy_writer (b64writer);
keydb_release (kh);
gcry_md_close (data_md);
es_fclose (sig_fp);
return err;
}
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