/* 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.
*
*
* 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 "keydb.h"
#include "../common/i18n.h"
+#include "../common/tlv.h"
/* Hash the data and return if something was hashed. Return -1 on error. */
}
-#if KSBA_VERSION_NUMBER >= 0x010400 && 0 /* 1.4.0 */
static gpg_error_t
add_signed_attribute (ksba_cms_t cms, const char *attrstr)
{
}
/* 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",
xfree (fields);
return err;
}
-#endif /*ksba >= 1.4.0 */
+
+
+\f
+/* 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;
+}
\f
gpg_error_t err;
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;
ksba_isotime_t signed_at;
certlist_t cl;
int release_signerlist = 0;
+ int binary_detached = detached && !ctrl->create_pem && !ctrl->create_base64;
audit_set_type (ctrl->audit, AUDIT_TYPE_SIGN);
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";
- rc = 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 (binary_detached)
+ {
+ sig_fp = es_fopenmem (0, "w+");
+ rc = sig_fp? 0 : gpg_error_from_syserror ();
+ if (!rc)
+ rc = gnupg_ksba_create_writer (&b64writer, 0, NULL, sig_fp, &writer);
+ }
+ else
+ {
+ rc = 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 (rc)
{
log_error ("can't create writer: %s\n", gpg_strerror (rc));
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)
{
if (!err)
err = ksba_cms_set_content_type
(cms, 1,
-#if KSBA_VERSION_NUMBER >= 0x010400 && 0
opt.authenticode? KSBA_CT_SPC_IND_DATA_CTX :
-#endif
KSBA_CT_DATA
);
if (err)
check that the signer's certificate is usable and valid. */
rc = gpgsm_cert_use_sign_p (cert, 0);
if (!rc)
- rc = gpgsm_validate_chain (ctrl, cert, "", NULL, 0, NULL, 0, NULL);
+ rc = gpgsm_validate_chain (ctrl, cert,
+ GNUPG_ISOTIME_NONE, NULL, 0, NULL, 0, NULL);
if (rc)
{
char *tmpfpr;
}
}
- /* We can add signed attributes only when build against libksba 1.4. */
-#if KSBA_VERSION_NUMBER >= 0x010400 && 0 /* 1.4.0 */
{
strlist_t sl;
if ((err = add_signed_attribute (cms, sl->d)))
goto leave;
}
-#else
- if (opt.attributes)
- log_info ("Note: option --attribute is ignored by this version\n");
-#endif /*ksba >= 1.4.0 */
/* 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:
-
- aes128-CBC
- des-EDE3-CBC
- */
- err = ksba_cms_add_smime_capability (cms, "2.16.840.1.101.3.4.1.2", NULL, 0);
+ * 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)
err = ksba_cms_build (cms, &stopreason);
if (err)
{
- log_debug ("ksba_cms_build failed: %s\n", gpg_strerror (err));
+ log_error ("creating CMS object failed: %s\n", gpg_strerror (err));
rc = err;
goto leave;
}
goto leave;
}
+ if (binary_detached)
+ {
+ void *blob = NULL;
+ size_t bloblen;
+
+ rc = es_fclose_snatch (sig_fp, &blob, &bloblen);
+ sig_fp = NULL;
+ if (rc)
+ goto leave;
+ rc = write_detached_signature (ctrl, blob, bloblen, out_fp);
+ xfree (blob);
+ if (rc)
+ goto leave;
+ }
+
+
audit_log (ctrl->audit, AUDIT_SIGNING_DONE);
log_info ("signature created\n");
gnupg_ksba_destroy_writer (b64writer);
keydb_release (kh);
gcry_md_close (data_md);
+ es_fclose (sig_fp);
return rc;
}
projects / platform / upstream / gpg2.git / blobdiff