/* sign.c - Sign a message
- * Copyright (C) 2001 Free Software Foundation, Inc.
+ * Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
*
* 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
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+ * USA.
*/
#include <config.h>
#include <time.h>
#include <assert.h>
+#include "gpgsm.h"
#include <gcrypt.h>
#include <ksba.h>
-#include "gpgsm.h"
#include "keydb.h"
#include "i18n.h"
static void
-hash_data (int fd, GCRY_MD_HD md)
+hash_data (int fd, gcry_md_hd_t md)
{
FILE *fp;
char buffer[4096];
fclose (fp);
}
+static int
+hash_and_copy_data (int fd, gcry_md_hd_t md, ksba_writer_t writer)
+{
+ gpg_error_t err;
+ FILE *fp;
+ char buffer[4096];
+ int nread;
+ int rc = 0;
+ int any = 0;
+
+ fp = fdopen ( dup (fd), "rb");
+ if (!fp)
+ {
+ gpg_error_t tmperr = gpg_error (gpg_err_code_from_errno (errno));
+ log_error ("fdopen(%d) failed: %s\n", fd, strerror (errno));
+ return tmperr;
+ }
+
+ do
+ {
+ nread = 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 (ferror (fp))
+ {
+ rc = gpg_error (gpg_err_code_from_errno (errno));
+ log_error ("read error on fd %d: %s\n", fd, strerror (errno));
+ }
+ fclose (fp);
+ if (!any)
+ {
+ /* We can't allow to sign 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 but an octet string of zeize 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 cabable
+ of signing our keyDB returns 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 (0);
+ if (!hd)
+ return gpg_error (GPG_ERR_GENERAL);
+ rc = keydb_search_first (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))
+ {
+ 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 (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 KsbaCert
-get_default_signer (void)
+static ksba_cert_t
+get_default_signer (ctrl_t ctrl)
{
- const char key[] = "1.2.840.113549.1.9.1=#7472757374407765622E6465#,CN=WEB.DE TrustCenter,OU=TrustCenter,O=WEB.DE AG,L=D-76227 Karlsruhe,C=DE";
- KsbaCert cert = NULL;
+ 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 = keydb_classify_name (opt.local_user, &desc);
+ if (rc)
+ {
+ log_error ("failed to find default signer: %s\n", gpg_strerror (rc));
+ return NULL;
+ }
+
kh = keydb_new (0);
if (!kh)
return NULL;
- rc = keydb_search_subject (kh, key);
+ rc = keydb_search (kh, &desc, 1);
if (rc)
{
log_debug ("failed to find default certificate: rc=%d\n", rc);
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;
+ log_debug ("adding certificates at level %d\n", n);
+ 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 (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 rc == -1? 0: rc;
+
+ ksba_failure:
+ ksba_cert_release (cert);
+ log_error ("ksba_cms_add_cert failed: %s\n", gpg_strerror (err));
+ return err;
+}
+
+
\f
/* Perform a sign operation.
- Sign the data received on DATA-FD in embedded mode or in deatched
- mode when DETACHED is true. Write the signature to OUT_FP The key
- used to sign is the default - we will extend the fucntion to take a
- list of fingerprints in the future. */
+ 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 ctrl, int data_fd, int detached, FILE *out_fp)
+gpgsm_sign (ctrl_t ctrl, certlist_t signerlist,
+ int data_fd, int detached, FILE *out_fp)
{
int i, rc;
- KsbaError err;
+ gpg_error_t err;
Base64Context b64writer = NULL;
- KsbaWriter writer;
- KsbaCMS cms = NULL;
- KsbaStopReason stopreason;
- KsbaCert cert;
+ ksba_writer_t writer;
+ ksba_cms_t cms = NULL;
+ ksba_stop_reason_t stopreason;
KEYDB_HANDLE kh = NULL;
- GCRY_MD_HD data_md = NULL;
+ gcry_md_hd_t data_md = NULL;
int signer;
const char *algoid;
int algo;
-
- if (!detached)
- {
- rc = seterr (Not_Implemented);
- goto leave;
- }
-
+ ksba_isotime_t signed_at;
+ certlist_t cl;
+ int release_signerlist = 0;
kh = keydb_new (0);
if (!kh)
{
log_error (_("failed to allocated keyDB handle\n"));
- rc = GNUPG_General_Error;
+ rc = gpg_error (GPG_ERR_GENERAL);
goto leave;
}
- rc = gpgsm_create_writer (&b64writer, ctrl, out_fp, &writer);
+ ctrl->pem_name = "SIGNED MESSAGE";
+ rc = gpgsm_create_writer (&b64writer, ctrl, out_fp, NULL, &writer);
if (rc)
{
- log_error ("can't create writer: %s\n", gnupg_strerror (rc));
+ log_error ("can't create writer: %s\n", gpg_strerror (rc));
goto leave;
}
- cms = ksba_cms_new ();
- if (!cms)
+ err = ksba_cms_new (&cms);
+ if (err)
{
- rc = seterr (Out_Of_Core);
+ rc = err;
goto leave;
}
if (err)
{
log_debug ("ksba_cms_set_reader_writer failed: %s\n",
- ksba_strerror (err));
- rc = map_ksba_err (err);
+ gpg_strerror (err));
+ rc = err;
goto leave;
}
if (err)
{
log_debug ("ksba_cms_set_content_type failed: %s\n",
- ksba_strerror (err));
- rc = map_ksba_err (err);
+ gpg_strerror (err));
+ rc = err;
goto leave;
}
-
- /* gather certificates of signers and store in theCMS object */
- /* fixme: process a list of fingerprints and store the certificate of
- each given fingerprint */
- cert = get_default_signer ();
- if (!cert)
+ /* If no list of signers is given, use a default one. */
+ if (!signerlist)
{
- log_error ("no default signer found\n");
- rc = seterr (General_Error);
- goto leave;
+ ksba_cert_t cert = get_default_signer (ctrl);
+ if (!cert)
+ {
+ log_error ("no default signer found\n");
+ rc = gpg_error (GPG_ERR_GENERAL);
+ goto leave;
+ }
+
+ /* Although we don't check for ambigious specification we will
+ check that the signer's certificate is is usable and
+ valid. */
+ rc = gpgsm_cert_use_sign_p (cert);
+ if (!rc)
+ rc = gpgsm_validate_chain (ctrl, cert, NULL, 0, NULL, 0);
+ if (rc)
+ goto leave;
+
+ /* That one is fine - create signerlist. */
+ signerlist = xtrycalloc (1, sizeof *signerlist);
+ if (!signerlist)
+ {
+ rc = out_of_core ();
+ ksba_cert_release (cert);
+ goto leave;
+ }
+ signerlist->cert = cert;
+ release_signerlist = 1;
}
- err = ksba_cms_add_signer (cms, cert);
- if (err)
+
+
+ /* Gather certificates of signers and store them in the CMS object. */
+ for (cl=signerlist; cl; cl = cl->next)
{
- log_debug ("ksba_cms_add_signer failed: %s\n", ksba_strerror (err));
- rc = map_ksba_err (err);
- goto leave;
+ rc = gpgsm_cert_use_sign_p (cl->cert);
+ if (rc)
+ goto leave;
+
+ err = ksba_cms_add_signer (cms, cl->cert);
+ if (err)
+ {
+ log_error ("ksba_cms_add_signer failed: %s\n", gpg_strerror (err));
+ rc = err;
+ goto leave;
+ }
+ rc = add_certificate_list (ctrl, cms, cl->cert);
+ if (rc)
+ {
+ log_error ("failed to store list of certificates: %s\n",
+ gpg_strerror(rc));
+ goto leave;
+ }
+ /* Set the hash algorithm we are going to use */
+ err = ksba_cms_add_digest_algo (cms, "1.3.14.3.2.26" /*SHA-1*/);
+ if (err)
+ {
+ log_debug ("ksba_cms_add_digest_algo failed: %s\n",
+ gpg_strerror (err));
+ rc = err;
+ goto leave;
+ }
}
- cert = NULL; /* cms does now own the certificate */
- /* fixme: We might want to include a list of certificate which are
- put as info into the signed data object - maybe we should add a
- flag to ksba_cms_add_signer to decider whether this cert should
- be send along with the signature */
-
- /* Set the hash algorithm we are going to use */
- err = ksba_cms_add_digest_algo (cms, "1.3.14.3.2.26" /*SHA-1*/);
- if (err)
+
+ /* 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. */
+ for (cl=signerlist; cl; cl = cl->next)
{
- log_debug ("ksba_cms_add_digest_algo failed: %s\n", ksba_strerror (err));
- rc = map_ksba_err (err);
- goto leave;
+ 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));
+ rc = err;
+ goto leave;
+ }
+ if (*buffer)
+ err = gpgsm_qualified_consent (ctrl, cl->cert);
+ else
+ err = gpgsm_not_qualified_warning (ctrl, cl->cert);
+ if (err)
+ {
+ rc = err;
+ goto leave;
+ }
}
-
+
/* Prepare hashing (actually we are figuring out what we have set above)*/
- data_md = gcry_md_open (0, 0);
- if (!data_md)
+ rc = gcry_md_open (&data_md, 0, 0);
+ if (rc)
{
- rc = map_gcry_err (gcry_errno());
- log_error ("md_open failed: %s\n", gcry_strerror (-1));
+ log_error ("md_open failed: %s\n", gpg_strerror (rc));
goto leave;
}
+ if (DBG_HASHING)
+ gcry_md_start_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:"?");
- rc = GNUPG_Bug;
+ if (algoid
+ && ( !strcmp (algoid, "1.2.840.113549.1.1.2")
+ ||!strcmp (algoid, "1.2.840.113549.2.2")))
+ log_info (_("(this is the MD2 algorithm)\n"));
+ rc = gpg_error (GPG_ERR_BUG);
goto leave;
}
gcry_md_enable (data_md, algo);
}
- signer = 0;
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
unsigned char *digest;
size_t digest_len;
/* Fixme do this for all signers and get the algo to use from
- the signer's certificate - does not make mich sense, bu we
- should do this consistent as we have already done it above */
+ the signer's certificate - does not make mich sense, but we
+ should do this consistent as we have already done it above. */
algo = GCRY_MD_SHA1;
hash_data (data_fd, data_md);
digest = gcry_md_read (data_md, algo);
if ( !digest || !digest_len)
{
log_error ("problem getting the hash of the data\n");
- rc = GNUPG_Bug;
+ rc = gpg_error (GPG_ERR_BUG);
goto leave;
}
- err = ksba_cms_set_message_digest (cms, signer, digest, digest_len);
+ for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
+ {
+ 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));
+ rc = 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_message_digest failed: %s\n",
- ksba_strerror (err));
- rc = map_ksba_err (err);
+ log_error ("ksba_cms_set_signing_time failed: %s\n",
+ gpg_strerror (err));
+ rc = err;
goto leave;
}
}
- err = ksba_cms_set_signing_time (cms, signer, 0 /*now*/);
+ /* 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);
+ if (!err)
+ err = ksba_cms_add_smime_capability (cms, "1.2.840.113549.3.7", NULL, 0);
if (err)
{
- log_error ("ksba_cms_set_signing_time failed: %s\n",
- ksba_strerror (err));
- rc = map_ksba_err (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_debug ("ksba_cms_build failed: %s\n", ksba_strerror (err));
- rc = map_ksba_err (err);
+ log_debug ("ksba_cms_build failed: %s\n", gpg_strerror (err));
+ rc = err;
goto leave;
}
- log_debug ("ksba_cms_build - stop reason %d\n", stopreason);
if (stopreason == KSBA_SR_BEGIN_DATA)
{ /* hash the data and store the message digest */
+ unsigned char *digest;
+ size_t digest_len;
+
assert (!detached);
+ /* Fixme: get the algo to use from the signer's certificate
+ - does not make much sense, but we should do this
+ consistent as we have already done it above. Code is
+ mostly duplicated above. */
+
+ algo = GCRY_MD_SHA1;
+ rc = hash_and_copy_data (data_fd, data_md, writer);
+ if (rc)
+ goto leave;
+ digest = gcry_md_read (data_md, algo);
+ digest_len = gcry_md_get_algo_dlen (algo);
+ if ( !digest || !digest_len)
+ {
+ log_error ("problem getting the hash of the data\n");
+ rc = gpg_error (GPG_ERR_BUG);
+ goto leave;
+ }
+ for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
+ {
+ 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));
+ rc = err;
+ goto leave;
+ }
+ }
}
else if (stopreason == KSBA_SR_NEED_SIG)
{ /* calculate the signature for all signers */
- GCRY_MD_HD md;
+ gcry_md_hd_t md;
algo = GCRY_MD_SHA1;
- signer = 0;
- md = gcry_md_open (algo, 0);
- if (!md)
+ rc = gcry_md_open (&md, algo, 0);
+ if (rc)
{
- log_error ("md_open failed: %s\n", gcry_strerror (-1));
+ log_error ("md_open failed: %s\n", gpg_strerror (rc));
goto leave;
}
+ if (DBG_HASHING)
+ gcry_md_start_debug (md, "sign.attr");
ksba_cms_set_hash_function (cms, HASH_FNC, md);
- rc = ksba_cms_hash_signed_attrs (cms, signer);
- if (rc)
+ for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
{
- log_debug ("hashing signed attrs failed: %s\n",
- ksba_strerror (rc));
- gcry_md_close (md);
- goto leave;
- }
-
- { /* This is all an temporary hack */
- char *sigval;
-
- cert = get_default_signer ();
- if (!cert)
+ unsigned char *sigval = NULL;
+ char *buf, *fpr;
+
+ if (signer)
+ gcry_md_reset (md);
+ rc = ksba_cms_hash_signed_attrs (cms, signer);
+ if (rc)
+ {
+ log_debug ("hashing signed attrs failed: %s\n",
+ gpg_strerror (rc));
+ gcry_md_close (md);
+ goto leave;
+ }
+
+ rc = gpgsm_create_cms_signature (ctrl, cl->cert,
+ md, algo, &sigval);
+ if (rc)
+ {
+ gcry_md_close (md);
+ goto leave;
+ }
+
+ err = ksba_cms_set_sig_val (cms, signer, sigval);
+ xfree (sigval);
+ if (err)
+ {
+ log_error ("failed to store the signature: %s\n",
+ gpg_strerror (err));
+ rc = err;
+ gcry_md_close (md);
+ goto leave;
+ }
+
+ /* write a status message */
+ fpr = gpgsm_get_fingerprint_hexstring (cl->cert, GCRY_MD_SHA1);
+ if (!fpr)
+ {
+ rc = gpg_error (GPG_ERR_ENOMEM);
+ gcry_md_close (md);
+ goto leave;
+ }
{
- log_error ("oops - failed to get cert again\n");
- rc = seterr (General_Error);
- goto leave;
- }
-
- sigval = NULL;
- rc = gpgsm_create_cms_signature (cert, md, algo, &sigval);
- if (rc)
- {
- ksba_cert_release (cert);
- goto leave;
+ int pkalgo = gpgsm_get_key_algo_info (cl->cert, NULL);
+ rc = asprintf (&buf, "%c %d %d 00 %s %s",
+ detached? 'D':'S',
+ pkalgo,
+ algo,
+ signed_at,
+ fpr);
}
+ xfree (fpr);
+ if (rc < 0)
+ {
+ rc = gpg_error (GPG_ERR_ENOMEM);
+ gcry_md_close (md);
+ goto leave;
+ }
+ rc = 0;
+ gpgsm_status (ctrl, STATUS_SIG_CREATED, buf);
+ free (buf); /* yes, we must use the regular free() here */
+ }
+ gcry_md_close (md);
- err = ksba_cms_set_sig_val (cms, signer, sigval);
- xfree (sigval);
- if (err)
- {
- log_error ("failed to store the signature: %s\n",
- ksba_strerror (err));
- rc = map_ksba_err (err);
- goto leave;
- }
- }
}
}
while (stopreason != KSBA_SR_READY);
+ rc = gpgsm_finish_writer (b64writer);
+ if (rc)
+ {
+ log_error ("write failed: %s\n", gpg_strerror (rc));
+ goto leave;
+ }
+
log_info ("signature created\n");
+
leave:
+ if (rc)
+ log_error ("error creating signature: %s <%s>\n",
+ gpg_strerror (rc), gpg_strsource (rc) );
+ if (release_signerlist)
+ gpgsm_release_certlist (signerlist);
ksba_cms_release (cms);
gpgsm_destroy_writer (b64writer);
keydb_release (kh);
projects / gnupg.git / blobdiff