Adding upstream version 2.2.40.upstream/2.2.40upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 731 insertions, 0 deletions

diff --git a/sm/verify.c b/sm/verify.c
new file mode 100644
index 0000000..5510f42
--- /dev/null
+++ b/sm/verify.c
@@ -0,0 +1,731 @@
+/* verify.c - Verify a messages signature
+ * Copyright (C) 2001, 2002, 2003, 2007,
+ *               2010 Free Software Foundation, Inc.
+ * Copyright (C) 2001-2019 Werner Koch
+ * Copyright (C) 2015-2020 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 <assert.h>
+
+#include "gpgsm.h"
+#include <gcrypt.h>
+#include <ksba.h>
+
+#include "keydb.h"
+#include "../common/i18n.h"
+#include "../common/compliance.h"
+
+static char *
+strtimestamp_r (ksba_isotime_t atime)
+{
+  char *buffer = xmalloc (15);
+
+  if (!atime || !*atime)
+    strcpy (buffer, "none");
+  else
+    sprintf (buffer, "%.4s-%.2s-%.2s", atime, atime+4, atime+6);
+  return buffer;
+}
+
+
+
+/* Hash the data for a detached signature.  Returns 0 on success.  */
+static gpg_error_t
+hash_data (int fd, gcry_md_hd_t md)
+{
+  gpg_error_t err = 0;
+  estream_t fp;
+  char buffer[4096];
+  int nread;
+
+  fp = es_fdopen_nc (fd, "rb");
+  if (!fp)
+    {
+      err = gpg_error_from_syserror ();
+      log_error ("fdopen(%d) failed: %s\n", fd, gpg_strerror (err));
+      return err;
+    }
+
+  do
+    {
+      nread = es_fread (buffer, 1, DIM(buffer), fp);
+      gcry_md_write (md, buffer, nread);
+    }
+  while (nread);
+  if (es_ferror (fp))
+    {
+      err = gpg_error_from_syserror ();
+      log_error ("read error on fd %d: %s\n", fd, gpg_strerror (err));
+    }
+  es_fclose (fp);
+  return err;
+}
+
+
+
+
+/* Perform a verify operation.  To verify detached signatures, DATA_FD
+   must be different than -1.  With OUT_FP given and a non-detached
+   signature, the signed material is written to that stream.  */
+int
+gpgsm_verify (ctrl_t ctrl, int in_fd, int data_fd, estream_t out_fp)
+{
+  int i, rc;
+  gnupg_ksba_io_t b64reader = NULL;
+  gnupg_ksba_io_t b64writer = NULL;
+  ksba_reader_t reader;
+  ksba_writer_t writer = NULL;
+  ksba_cms_t cms = NULL;
+  ksba_stop_reason_t stopreason;
+  ksba_cert_t cert;
+  KEYDB_HANDLE kh;
+  gcry_md_hd_t data_md = NULL;
+  int signer;
+  const char *algoid;
+  int algo;
+  int is_detached;
+  estream_t in_fp = NULL;
+  char *p;
+
+  audit_set_type (ctrl->audit, AUDIT_TYPE_VERIFY);
+
+  kh = keydb_new ();
+  if (!kh)
+    {
+      log_error (_("failed to allocate keyDB handle\n"));
+      rc = gpg_error (GPG_ERR_GENERAL);
+      goto leave;
+    }
+
+
+  in_fp = es_fdopen_nc (in_fd, "rb");
+  if (!in_fp)
+    {
+      rc = gpg_error_from_syserror ();
+      log_error ("fdopen() failed: %s\n", strerror (errno));
+      goto leave;
+    }
+
+  rc = gnupg_ksba_create_reader
+    (&b64reader, ((ctrl->is_pem? GNUPG_KSBA_IO_PEM : 0)
+                  | (ctrl->is_base64? GNUPG_KSBA_IO_BASE64 : 0)
+                  | (ctrl->autodetect_encoding? GNUPG_KSBA_IO_AUTODETECT : 0)),
+     in_fp, &reader);
+  if (rc)
+    {
+      log_error ("can't create reader: %s\n", gpg_strerror (rc));
+      goto leave;
+    }
+
+  if (out_fp)
+    {
+      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;
+        }
+    }
+
+  rc = ksba_cms_new (&cms);
+  if (rc)
+    goto leave;
+
+  rc = ksba_cms_set_reader_writer (cms, reader, writer);
+  if (rc)
+    {
+      log_error ("ksba_cms_set_reader_writer failed: %s\n",
+                 gpg_strerror (rc));
+      goto leave;
+    }
+
+  rc = gcry_md_open (&data_md, 0, 0);
+  if (rc)
+    {
+      log_error ("md_open failed: %s\n", gpg_strerror (rc));
+      goto leave;
+    }
+  if (DBG_HASHING)
+    gcry_md_debug (data_md, "vrfy.data");
+
+  audit_log (ctrl->audit, AUDIT_SETUP_READY);
+
+  is_detached = 0;
+  do
+    {
+      rc = ksba_cms_parse (cms, &stopreason);
+      if (rc)
+        {
+          log_error ("ksba_cms_parse failed: %s\n", gpg_strerror (rc));
+          goto leave;
+        }
+
+      if (stopreason == KSBA_SR_NEED_HASH)
+        {
+          is_detached = 1;
+          audit_log (ctrl->audit, AUDIT_DETACHED_SIGNATURE);
+          if (opt.verbose)
+            log_info ("detached signature\n");
+        }
+
+      if (stopreason == KSBA_SR_NEED_HASH
+          || stopreason == KSBA_SR_BEGIN_DATA)
+        {
+          audit_log (ctrl->audit, AUDIT_GOT_DATA);
+
+          /* We are now able to enable the hash algorithms */
+          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:"?");
+                  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"));
+                  audit_log_s (ctrl->audit, AUDIT_BAD_DATA_HASH_ALGO, algoid);
+                }
+              else
+                {
+                  if (DBG_X509)
+                    log_debug ("enabling hash algorithm %d (%s)\n",
+                               algo, algoid? algoid:"");
+                  gcry_md_enable (data_md, algo);
+                  audit_log_i (ctrl->audit, AUDIT_DATA_HASH_ALGO, algo);
+                }
+            }
+          if (opt.extra_digest_algo)
+            {
+              if (DBG_X509)
+                log_debug ("enabling extra hash algorithm %d\n",
+                           opt.extra_digest_algo);
+              gcry_md_enable (data_md, opt.extra_digest_algo);
+              audit_log_i (ctrl->audit, AUDIT_DATA_HASH_ALGO,
+                           opt.extra_digest_algo);
+            }
+          if (is_detached)
+            {
+              if (data_fd == -1)
+                {
+                  log_info ("detached signature w/o data "
+                            "- assuming certs-only\n");
+                  audit_log (ctrl->audit, AUDIT_CERT_ONLY_SIG);
+                }
+              else
+                audit_log_ok (ctrl->audit, AUDIT_DATA_HASHING,
+                              hash_data (data_fd, data_md));
+            }
+          else
+            {
+              ksba_cms_set_hash_function (cms, HASH_FNC, data_md);
+            }
+        }
+      else if (stopreason == KSBA_SR_END_DATA)
+        { /* The data bas been hashed */
+          audit_log_ok (ctrl->audit, AUDIT_DATA_HASHING, 0);
+        }
+    }
+  while (stopreason != KSBA_SR_READY);
+
+  if (b64writer)
+    {
+      rc = gnupg_ksba_finish_writer (b64writer);
+      if (rc)
+        {
+          log_error ("write failed: %s\n", gpg_strerror (rc));
+          audit_log_ok (ctrl->audit, AUDIT_WRITE_ERROR, rc);
+          goto leave;
+        }
+    }
+
+  if (data_fd != -1 && !is_detached)
+    {
+      log_error ("data given for a non-detached signature\n");
+      rc = gpg_error (GPG_ERR_CONFLICT);
+      audit_log (ctrl->audit, AUDIT_USAGE_ERROR);
+      goto leave;
+    }
+
+  for (i=0; (cert=ksba_cms_get_cert (cms, i)); i++)
+    {
+      /* Fixme: it might be better to check the validity of the
+         certificate first before entering it into the DB.  This way
+         we would avoid cluttering the DB with invalid
+         certificates. */
+      audit_log_cert (ctrl->audit, AUDIT_SAVE_CERT, cert,
+                      keydb_store_cert (ctrl, cert, 0, NULL));
+      ksba_cert_release (cert);
+    }
+
+  cert = NULL;
+  for (signer=0; ; signer++)
+    {
+      char *issuer = NULL;
+      gcry_sexp_t sigval = NULL;
+      ksba_isotime_t sigtime, keyexptime;
+      ksba_sexp_t serial;
+      char *msgdigest = NULL;
+      size_t msgdigestlen;
+      char *ctattr;
+      int sigval_hash_algo;
+      int info_pkalgo;
+      unsigned int nbits;
+      int pkalgo;
+      char *pkalgostr = NULL;
+      char *pkfpr = NULL;
+      unsigned int pkalgoflags, verifyflags;
+
+      rc = ksba_cms_get_issuer_serial (cms, signer, &issuer, &serial);
+      if (!signer && gpg_err_code (rc) == GPG_ERR_NO_DATA
+          && data_fd == -1 && is_detached)
+        {
+          log_info ("certs-only message accepted\n");
+          rc = 0;
+          break;
+        }
+      if (rc)
+        {
+          if (signer && rc == -1)
+            rc = 0;
+          break;
+        }
+
+      gpgsm_status (ctrl, STATUS_NEWSIG, NULL);
+      audit_log_i (ctrl->audit, AUDIT_NEW_SIG, signer);
+
+      if (DBG_X509)
+        {
+          log_debug ("signer %d - issuer: '%s'\n",
+                     signer, issuer? issuer:"[NONE]");
+          log_debug ("signer %d - serial: ", signer);
+          gpgsm_dump_serial (serial);
+          log_printf ("\n");
+        }
+      if (ctrl->audit)
+        {
+          char *tmpstr = gpgsm_format_sn_issuer (serial, issuer);
+          audit_log_s (ctrl->audit, AUDIT_SIG_NAME, tmpstr);
+          xfree (tmpstr);
+        }
+
+      rc = ksba_cms_get_signing_time (cms, signer, sigtime);
+      if (gpg_err_code (rc) == GPG_ERR_NO_DATA)
+        *sigtime = 0;
+      else if (rc)
+        {
+          log_error ("error getting signing time: %s\n", gpg_strerror (rc));
+          *sigtime = 0; /* (we can't encode an error in the time string.) */
+        }
+
+      rc = ksba_cms_get_message_digest (cms, signer,
+                                        &msgdigest, &msgdigestlen);
+      if (!rc)
+        {
+          algoid = ksba_cms_get_digest_algo (cms, signer);
+          algo = gcry_md_map_name (algoid);
+          if (DBG_X509)
+            log_debug ("signer %d - digest algo: %d\n", signer, algo);
+          if (! gcry_md_is_enabled (data_md, algo))
+            {
+              log_error ("digest algo %d (%s) has not been enabled\n",
+                         algo, algoid?algoid:"");
+              audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "unsupported");
+              goto next_signer;
+            }
+        }
+      else if (gpg_err_code (rc) == GPG_ERR_NO_DATA)
+        {
+          assert (!msgdigest);
+          rc = 0;
+          algoid = NULL;
+          algo = 0;
+        }
+      else /* real error */
+        {
+          audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "error");
+          break;
+        }
+
+      rc = ksba_cms_get_sigattr_oids (cms, signer,
+                                      "1.2.840.113549.1.9.3", &ctattr);
+      if (!rc)
+        {
+          const char *s;
+
+          if (DBG_X509)
+            log_debug ("signer %d - content-type attribute: %s",
+                       signer, ctattr);
+
+          s = ksba_cms_get_content_oid (cms, 1);
+          if (!s || strcmp (ctattr, s))
+            {
+              log_error ("content-type attribute does not match "
+                         "actual content-type\n");
+              ksba_free (ctattr);
+              ctattr = NULL;
+              audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "bad");
+              goto next_signer;
+            }
+          ksba_free (ctattr);
+          ctattr = NULL;
+        }
+      else if (rc != -1)
+        {
+          log_error ("error getting content-type attribute: %s\n",
+                     gpg_strerror (rc));
+          audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "bad");
+          goto next_signer;
+        }
+      rc = 0;
+
+
+      sigval = gpgsm_ksba_cms_get_sig_val (cms, signer);
+      if (!sigval)
+        {
+          log_error ("no signature value available\n");
+          audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "bad");
+          goto next_signer;
+        }
+
+      sigval_hash_algo = gpgsm_get_hash_algo_from_sigval (sigval, &pkalgoflags);
+      if (DBG_X509)
+        {
+          log_debug ("signer %d - signature available (sigval hash=%d pkaf=%u)",
+                     signer, sigval_hash_algo, pkalgoflags);
+        }
+      if (!sigval_hash_algo)
+        sigval_hash_algo = algo; /* Fallback used e.g. with old libksba. */
+
+      /* Find the certificate of the signer */
+      keydb_search_reset (kh);
+      rc = keydb_search_issuer_sn (ctrl, kh, issuer, serial);
+      if (rc)
+        {
+          if (rc == -1)
+            {
+              log_error ("certificate not found\n");
+              rc = gpg_error (GPG_ERR_NO_PUBKEY);
+            }
+          else
+            log_error ("failed to find the certificate: %s\n",
+                       gpg_strerror(rc));
+          {
+            char numbuf[50];
+            sprintf (numbuf, "%d", rc);
+
+            gpgsm_status2 (ctrl, STATUS_ERROR, "verify.findkey",
+                           numbuf, NULL);
+          }
+          audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "no-cert");
+          goto next_signer;
+        }
+
+      rc = keydb_get_cert (kh, &cert);
+      if (rc)
+        {
+          log_error ("failed to get cert: %s\n", gpg_strerror (rc));
+          audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "error");
+          goto next_signer;
+        }
+
+      pkfpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
+      pkalgostr = gpgsm_pubkey_algo_string (cert, NULL);
+      pkalgo = gpgsm_get_key_algo_info (cert, &nbits);
+
+      log_info (_("Signature made "));
+      if (*sigtime)
+        {
+          /* We take the freedom as noted in RFC3339 to use a space
+           * instead of the "T" delimiter between date and time.  We
+           * also append a separate UTC instead of a "Z" or "+00:00"
+           * suffix because that makes it clear to everyone what kind
+           * of time this is.  */
+          dump_isotime (sigtime);
+          log_printf (" UTC");
+        }
+      else
+        log_printf (_("[date not given]"));
+      log_info (_("               using %s key %s\n"), pkalgostr, pkfpr);
+      if (opt.verbose)
+        {
+          log_info (_("algorithm:"));
+          log_printf (" %s + %s",
+                      pubkey_algo_to_string (pkalgo),
+                      gcry_md_algo_name (sigval_hash_algo));
+          if (algo != sigval_hash_algo)
+            log_printf (" (%s)", gcry_md_algo_name (algo));
+          log_printf ("\n");
+        }
+
+      audit_log_i (ctrl->audit, AUDIT_DATA_HASH_ALGO, algo);
+
+      /* Check compliance.  */
+      if (! gnupg_pk_is_allowed (opt.compliance, PK_USE_VERIFICATION,
+                                 pkalgo, pkalgoflags, NULL, nbits, NULL))
+        {
+          char  kidstr[10+1];
+
+          snprintf (kidstr, sizeof kidstr, "0x%08lX",
+                    gpgsm_get_short_fingerprint (cert, NULL));
+          log_error (_("key %s may not be used for signing in %s mode\n"),
+                     kidstr,
+                     gnupg_compliance_option_string (opt.compliance));
+          goto next_signer;
+        }
+
+      if (!gnupg_digest_is_allowed (opt.compliance, 0, sigval_hash_algo))
+        {
+          log_error (_("digest algorithm '%s' may not be used in %s mode\n"),
+                     gcry_md_algo_name (sigval_hash_algo),
+                     gnupg_compliance_option_string (opt.compliance));
+          goto next_signer;
+        }
+
+      /* Check compliance with CO_DE_VS.  */
+      if (gnupg_pk_is_compliant (CO_DE_VS, pkalgo, pkalgoflags,
+                                 NULL, nbits, NULL)
+          && gnupg_gcrypt_is_compliant (CO_DE_VS)
+          && gnupg_digest_is_compliant (CO_DE_VS, sigval_hash_algo))
+        gpgsm_status (ctrl, STATUS_VERIFICATION_COMPLIANCE_MODE,
+                      gnupg_status_compliance_flag (CO_DE_VS));
+      else if (opt.require_compliance
+               && opt.compliance == CO_DE_VS)
+        {
+          log_error (_("operation forced to fail due to"
+                       " unfulfilled compliance rules\n"));
+          gpgsm_errors_seen = 1;
+        }
+
+
+      /* Now we can check the signature.  */
+      if (msgdigest)
+        { /* Signed attributes are available. */
+          gcry_md_hd_t md;
+          unsigned char *s;
+
+          /* Check that the message digest in the signed attributes
+             matches the one we calculated on the data.  */
+          s = gcry_md_read (data_md, algo);
+          if ( !s || !msgdigestlen
+               || gcry_md_get_algo_dlen (algo) != msgdigestlen
+               || memcmp (s, msgdigest, msgdigestlen) )
+            {
+              char *fpr;
+
+              log_error (_("invalid signature: message digest attribute "
+                           "does not match computed one\n"));
+              if (DBG_X509)
+                {
+                  if (msgdigest)
+                    log_printhex (msgdigest, msgdigestlen, "message:  ");
+                  if (s)
+                    log_printhex (s, gcry_md_get_algo_dlen (algo),
+                                  "computed: ");
+                }
+              fpr = gpgsm_fpr_and_name_for_status (cert);
+              gpgsm_status (ctrl, STATUS_BADSIG, fpr);
+              xfree (fpr);
+              audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "bad");
+              goto next_signer;
+            }
+
+          audit_log_i (ctrl->audit, AUDIT_ATTR_HASH_ALGO, sigval_hash_algo);
+          rc = gcry_md_open (&md, sigval_hash_algo, 0);
+          if (rc)
+            {
+              log_error ("md_open failed: %s\n", gpg_strerror (rc));
+              audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "error");
+              goto next_signer;
+            }
+          if (DBG_HASHING)
+            gcry_md_debug (md, "vrfy.attr");
+
+          ksba_cms_set_hash_function (cms, HASH_FNC, md);
+          rc = ksba_cms_hash_signed_attrs (cms, signer);
+          if (rc)
+            {
+              log_error ("hashing signed attrs failed: %s\n",
+                         gpg_strerror (rc));
+              gcry_md_close (md);
+              audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "error");
+              goto next_signer;
+            }
+          rc = gpgsm_check_cms_signature (cert, sigval, md, sigval_hash_algo,
+                                          pkalgoflags, &info_pkalgo);
+          gcry_md_close (md);
+        }
+      else
+        {
+          rc = gpgsm_check_cms_signature (cert, sigval, data_md,
+                                          algo, pkalgoflags, &info_pkalgo);
+        }
+
+      if (rc)
+        {
+          char *fpr;
+
+          log_error ("invalid signature: %s\n", gpg_strerror (rc));
+          fpr = gpgsm_fpr_and_name_for_status (cert);
+          gpgsm_status (ctrl, STATUS_BADSIG, fpr);
+          xfree (fpr);
+          audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "bad");
+          goto next_signer;
+        }
+      rc = gpgsm_cert_use_verify_p (cert); /*(this displays an info message)*/
+      if (rc)
+        {
+          gpgsm_status_with_err_code (ctrl, STATUS_ERROR, "verify.keyusage",
+                                      gpg_err_code (rc));
+          rc = 0;
+        }
+
+      if (DBG_X509)
+        log_debug ("signature okay - checking certs\n");
+      audit_log (ctrl->audit, AUDIT_VALIDATE_CHAIN);
+      rc = gpgsm_validate_chain (ctrl, cert,
+                                 *sigtime? sigtime : "19700101T000000",
+                                 keyexptime, 0,
+                                 NULL, 0, &verifyflags);
+      {
+        char *fpr, *buf, *tstr;
+
+        fpr = gpgsm_fpr_and_name_for_status (cert);
+        if (gpg_err_code (rc) == GPG_ERR_CERT_EXPIRED)
+          {
+            gpgsm_status (ctrl, STATUS_EXPKEYSIG, fpr);
+            rc = 0;
+          }
+        else
+          gpgsm_status (ctrl, STATUS_GOODSIG, fpr);
+
+        xfree (fpr);
+
+        fpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
+        tstr = strtimestamp_r (sigtime);
+        buf = xasprintf ("%s %s %s %s 0 0 %d %d 00", fpr, tstr,
+                         *sigtime? sigtime : "0",
+                         *keyexptime? keyexptime : "0",
+                         info_pkalgo, algo);
+        xfree (tstr);
+        xfree (fpr);
+        gpgsm_status (ctrl, STATUS_VALIDSIG, buf);
+        xfree (buf);
+      }
+
+      audit_log_ok (ctrl->audit, AUDIT_CHAIN_STATUS, rc);
+      if (rc) /* of validate_chain */
+        {
+          log_error ("invalid certification chain: %s\n", gpg_strerror (rc));
+          if (gpg_err_code (rc) == GPG_ERR_BAD_CERT_CHAIN
+              || gpg_err_code (rc) == GPG_ERR_BAD_CERT
+              || gpg_err_code (rc) == GPG_ERR_BAD_CA_CERT
+              || gpg_err_code (rc) == GPG_ERR_CERT_REVOKED)
+            gpgsm_status_with_err_code (ctrl, STATUS_TRUST_NEVER, NULL,
+                                        gpg_err_code (rc));
+          else
+            gpgsm_status_with_err_code (ctrl, STATUS_TRUST_UNDEFINED, NULL,
+                                        gpg_err_code (rc));
+          audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "bad");
+          goto next_signer;
+        }
+
+      audit_log_s (ctrl->audit, AUDIT_SIG_STATUS, "good");
+
+      for (i=0; (p = ksba_cert_get_subject (cert, i)); i++)
+        {
+          log_info (!i? _("Good signature from")
+                      : _("                aka"));
+          log_printf (" \"");
+          gpgsm_es_print_name (log_get_stream (), p);
+          log_printf ("\"\n");
+          ksba_free (p);
+        }
+
+      /* Print a note if this is a qualified signature.  */
+      {
+        size_t qualbuflen;
+        char qualbuffer[1];
+
+        rc = ksba_cert_get_user_data (cert, "is_qualified", &qualbuffer,
+                                      sizeof (qualbuffer), &qualbuflen);
+        if (!rc && qualbuflen)
+          {
+            if (*qualbuffer)
+              {
+                log_info (_("This is a qualified signature\n"));
+                if (!opt.qualsig_approval)
+                  log_info
+                    (_("Note, that this software is not officially approved "
+                       "to create or verify such signatures.\n"));
+              }
+          }
+        else if (gpg_err_code (rc) != GPG_ERR_NOT_FOUND)
+          log_error ("get_user_data(is_qualified) failed: %s\n",
+                     gpg_strerror (rc));
+      }
+
+      gpgsm_status (ctrl, STATUS_TRUST_FULLY,
+                    (verifyflags & VALIDATE_FLAG_STEED)?
+                    "0 steed":
+                    (verifyflags & VALIDATE_FLAG_CHAIN_MODEL)?
+                    "0 chain": "0 shell");
+
+    next_signer:
+      rc = 0;
+      xfree (issuer);
+      xfree (serial);
+      gcry_sexp_release (sigval);
+      xfree (msgdigest);
+      xfree (pkalgostr);
+      xfree (pkfpr);
+      ksba_cert_release (cert);
+      cert = NULL;
+    }
+  rc = 0;
+
+ leave:
+  ksba_cms_release (cms);
+  gnupg_ksba_destroy_reader (b64reader);
+  gnupg_ksba_destroy_writer (b64writer);
+  keydb_release (kh);
+  gcry_md_close (data_md);
+  es_fclose (in_fp);
+
+  if (rc)
+    {
+      char numbuf[50];
+      sprintf (numbuf, "%d", rc );
+      gpgsm_status2 (ctrl, STATUS_ERROR, "verify.leave",
+                     numbuf, NULL);
+    }
+
+  return rc;
+}