This commit was manufactured by cvs2svn to create branch

'GNUPG-1-9-BRANCH'.

1 files changed, 621 insertions, 0 deletions

diff --git a/sm/sign.c b/sm/sign.c
new file mode 100644
index 000000000..0afb52b62
--- /dev/null
+++ b/sm/sign.c
@@ -0,0 +1,621 @@
+/* sign.c - Sign a message
+ *	Copyright (C) 2001, 2002, 2003 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 <unistd.h> 
+#include <time.h>
+#include <assert.h>
+
+#include "gpgsm.h"
+#include <gcrypt.h>
+#include <ksba.h>
+
+#include "keydb.h"
+#include "i18n.h"
+
+
+static void
+hash_data (int fd, gcry_md_hd_t md)
+{
+  FILE *fp;
+  char buffer[4096];
+  int nread;
+
+  fp = fdopen ( dup (fd), "rb");
+  if (!fp)
+    {
+      log_error ("fdopen(%d) failed: %s\n", fd, strerror (errno));
+      return;
+    }
+
+  do 
+    {
+      nread = fread (buffer, 1, DIM(buffer), fp);
+      gcry_md_write (md, buffer, nread);
+    }
+  while (nread);
+  if (ferror (fp))
+      log_error ("read error on fd %d: %s\n", fd, strerror (errno));
+  fclose (fp);
+}
+
+static int
+hash_and_copy_data (int fd, gcry_md_hd_t md, KsbaWriter writer)
+{
+  KsbaError 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", ksba_strerror (err));
+              rc = map_ksba_err (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", ksba_strerror (err));
+          rc = map_ksba_err (err);
+        }
+    }
+
+  return rc;
+}
+
+
+/* Get the default certificate which is defined as the first one our
+   keyDB retruns and has a secret key available */
+int
+gpgsm_get_default_cert (KsbaCert *r_cert)
+{
+  KEYDB_HANDLE hd;
+  KsbaCert 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;
+        }
+      
+      p = gpgsm_get_keygrip_hexstring (cert);
+      if (p)
+        {
+          if (!gpgsm_agent_havekey (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)
+{
+  KEYDB_SEARCH_DESC desc;
+  KsbaCert cert = NULL;
+  KEYDB_HANDLE kh = NULL;
+  int rc;
+
+  if (!opt.local_user)
+    {
+      rc = gpgsm_get_default_cert (&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 (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 ctrl, KsbaCMS cms, KsbaCert cert)
+{
+  KsbaError err;
+  int rc = 0;
+  KsbaCert 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 */
+
+  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;
+    }
+  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", ksba_strerror (err));
+  return map_ksba_err (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 ctrl, CERTLIST signerlist,
+            int data_fd, int detached, FILE *out_fp)
+{
+  int i, rc;
+  KsbaError err;
+  Base64Context b64writer = NULL;
+  KsbaWriter writer;
+  KsbaCMS cms = NULL;
+  KsbaStopReason stopreason;
+  KEYDB_HANDLE kh = NULL;
+  gcry_md_hd_t data_md = NULL;
+  int signer;
+  const char *algoid;
+  int algo;
+  time_t signed_at;
+  CERTLIST cl;
+  int release_signerlist = 0;
+
+  kh = keydb_new (0);
+  if (!kh)
+    {
+      log_error (_("failed to allocated keyDB handle\n"));
+      rc = gpg_error (GPG_ERR_GENERAL);
+      goto leave;
+    }
+
+  ctrl->pem_name = "SIGNED MESSAGE";
+  rc = gpgsm_create_writer (&b64writer, ctrl, out_fp, &writer);
+  if (rc)
+    {
+      log_error ("can't create writer: %s\n", gpg_strerror (rc));
+      goto leave;
+    }
+
+  cms = ksba_cms_new ();
+  if (!cms)
+    {
+      rc = gpg_error (GPG_ERR_ENOMEM);
+      goto leave;
+    }
+
+  err = ksba_cms_set_reader_writer (cms, NULL, writer);
+  if (err)
+    {
+      log_debug ("ksba_cms_set_reader_writer failed: %s\n",
+                 ksba_strerror (err));
+      rc = map_ksba_err (err);
+      goto leave;
+    }
+
+  /* We are going to create signed data with data as encap. content */
+  err = ksba_cms_set_content_type (cms, 0, KSBA_CT_SIGNED_DATA);
+  if (!err)
+    err = ksba_cms_set_content_type (cms, 1, KSBA_CT_DATA);
+  if (err)
+    {
+      log_debug ("ksba_cms_set_content_type failed: %s\n",
+                 ksba_strerror (err));
+      rc = map_ksba_err (err);
+      goto leave;
+    }
+
+  /* If no list of signers is given, use a default one. */
+  if (!signerlist)
+    {
+      KsbaCert cert = get_default_signer ();
+      if (!cert)
+        {
+          log_error ("no default signer found\n");
+          rc = gpg_error (GPG_ERR_GENERAL);
+          goto leave;
+        }
+      signerlist = xtrycalloc (1, sizeof *signerlist);
+      if (!signerlist)
+        {
+          rc = OUT_OF_CORE (errno);
+          ksba_cert_release (cert);
+          goto leave;
+        }
+      signerlist->cert = cert;
+      release_signerlist = 1;
+    }
+
+
+  /* Gather certificates of signers and store them in the CMS object. */
+  for (cl=signerlist; cl; cl = cl->next)
+    {
+      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",  ksba_strerror (err));
+          rc = map_ksba_err (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",
+                     ksba_strerror (err));
+          rc = map_ksba_err (err);
+          goto leave;
+        }
+    }
+  
+  /* Prepare hashing (actually we are figuring out what we have set above)*/
+  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_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 = gpg_error (GPG_ERR_BUG);
+          goto leave;
+        }
+      gcry_md_enable (data_md, algo);
+    }
+
+  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;
+      /* 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 */
+      algo = GCRY_MD_SHA1; 
+      hash_data (data_fd, data_md);
+      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",
+                         ksba_strerror (err));
+              rc = map_ksba_err (err);
+              goto leave;
+            }
+        }
+    }
+
+  signed_at = gnupg_get_time ();
+  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",
+                     ksba_strerror (err));
+          rc = map_ksba_err (err);
+          goto leave;
+        }
+    }
+
+  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);
+          goto leave;
+        }
+
+      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",
+                             ksba_strerror (err));
+                  rc = map_ksba_err (err);
+                  goto leave;
+                }
+            }
+        }
+      else if (stopreason == KSBA_SR_NEED_SIG)
+        { /* calculate the signature for all signers */
+          gcry_md_hd_t md;
+
+          algo = GCRY_MD_SHA1;
+          rc = gcry_md_open (&md, algo, 0);
+          if (rc)
+            {
+              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);
+          for (cl=signerlist,signer=0; cl; cl = cl->next, signer++)
+            {
+              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",
+                             ksba_strerror (rc));
+                  gcry_md_close (md);
+                  goto leave;
+                }
+            
+              rc = gpgsm_create_cms_signature (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",
+                             ksba_strerror (err));
+                  rc = map_ksba_err (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;
+                }
+              rc = asprintf (&buf, "%c %d %d 00 %lu %s",
+                             detached? 'D':'S',
+                             GCRY_PK_RSA,  /* FIXME: get pk algo from cert */
+                             algo, 
+                             (ulong)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);
+
+        }
+    }
+  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 (release_signerlist)
+    gpgsm_release_certlist (signerlist);
+  ksba_cms_release (cms);
+  gpgsm_destroy_writer (b64writer);
+  keydb_release (kh); 
+  gcry_md_close (data_md);
+  return rc;
+}