Adding upstream version 2.2.27.upstream/2.2.27upstream

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

1 files changed, 1092 insertions, 0 deletions

diff --git a/sm/call-dirmngr.c b/sm/call-dirmngr.c
new file mode 100644
index 0000000..36afd22
--- /dev/null
+++ b/sm/call-dirmngr.c
@@ -0,0 +1,1092 @@
+/* call-dirmngr.c - Communication with the dirmngr
+ * Copyright (C) 2002, 2003, 2005, 2007, 2008,
+ *               2010  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 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/>.
+ */
+
+#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 <ctype.h>
+
+#include "gpgsm.h"
+#include <gcrypt.h>
+#include <assuan.h>
+
+#include "../common/i18n.h"
+#include "keydb.h"
+#include "../common/asshelp.h"
+
+
+struct membuf {
+  size_t len;
+  size_t size;
+  char *buf;
+  int out_of_core;
+};
+
+
+
+/* fixme: We need a context for each thread or serialize the access to
+   the dirmngr.  */
+static assuan_context_t dirmngr_ctx = NULL;
+static assuan_context_t dirmngr2_ctx = NULL;
+
+static int dirmngr_ctx_locked;
+static int dirmngr2_ctx_locked;
+
+struct inq_certificate_parm_s {
+  ctrl_t ctrl;
+  assuan_context_t ctx;
+  ksba_cert_t cert;
+  ksba_cert_t issuer_cert;
+};
+
+struct isvalid_status_parm_s {
+  ctrl_t ctrl;
+  int seen;
+  unsigned char fpr[20];
+};
+
+
+struct lookup_parm_s {
+  ctrl_t ctrl;
+  assuan_context_t ctx;
+  void (*cb)(void *, ksba_cert_t);
+  void *cb_value;
+  struct membuf data;
+  int error;
+};
+
+struct run_command_parm_s {
+  ctrl_t ctrl;
+  assuan_context_t ctx;
+};
+
+
+
+static gpg_error_t get_cached_cert (assuan_context_t ctx,
+                                    const unsigned char *fpr,
+                                    ksba_cert_t *r_cert);
+
+
+
+/* A simple implementation of a dynamic buffer.  Use init_membuf() to
+   create a buffer, put_membuf to append bytes and get_membuf to
+   release and return the buffer.  Allocation errors are detected but
+   only returned at the final get_membuf(), this helps not to clutter
+   the code with out of core checks.  */
+
+static void
+init_membuf (struct membuf *mb, int initiallen)
+{
+  mb->len = 0;
+  mb->size = initiallen;
+  mb->out_of_core = 0;
+  mb->buf = xtrymalloc (initiallen);
+  if (!mb->buf)
+      mb->out_of_core = 1;
+}
+
+static void
+put_membuf (struct membuf *mb, const void *buf, size_t len)
+{
+  if (mb->out_of_core)
+    return;
+
+  if (mb->len + len >= mb->size)
+    {
+      char *p;
+
+      mb->size += len + 1024;
+      p = xtryrealloc (mb->buf, mb->size);
+      if (!p)
+        {
+          mb->out_of_core = 1;
+          return;
+        }
+      mb->buf = p;
+    }
+  memcpy (mb->buf + mb->len, buf, len);
+  mb->len += len;
+}
+
+static void *
+get_membuf (struct membuf *mb, size_t *len)
+{
+  char *p;
+
+  if (mb->out_of_core)
+    {
+      xfree (mb->buf);
+      mb->buf = NULL;
+      return NULL;
+    }
+
+  p = mb->buf;
+  *len = mb->len;
+  mb->buf = NULL;
+  mb->out_of_core = 1; /* don't allow a reuse */
+  return p;
+}
+
+
+/* Print a warning if the server's version number is less than our
+   version number.  Returns an error code on a connection problem.  */
+static gpg_error_t
+warn_version_mismatch (ctrl_t ctrl, assuan_context_t ctx,
+                       const char *servername, int mode)
+{
+  gpg_error_t err;
+  char *serverversion;
+  const char *myversion = strusage (13);
+
+  err = get_assuan_server_version (ctx, mode, &serverversion);
+  if (err)
+    log_error (_("error getting version from '%s': %s\n"),
+               servername, gpg_strerror (err));
+  else if (compare_version_strings (serverversion, myversion) < 0)
+    {
+      char *warn;
+
+      warn = xtryasprintf (_("server '%s' is older than us (%s < %s)"),
+                           servername, serverversion, myversion);
+      if (!warn)
+        err = gpg_error_from_syserror ();
+      else
+        {
+          log_info (_("WARNING: %s\n"), warn);
+          if (!opt.quiet)
+            {
+              log_info (_("Note: Outdated servers may lack important"
+                          " security fixes.\n"));
+              log_info (_("Note: Use the command \"%s\" to restart them.\n"),
+                        "gpgconf --kill all");
+            }
+          gpgsm_status2 (ctrl, STATUS_WARNING, "server_version_mismatch 0",
+                         warn, NULL);
+          xfree (warn);
+        }
+    }
+  xfree (serverversion);
+  return err;
+}
+
+
+/* This function prepares the dirmngr for a new session.  The
+   audit-events option is used so that other dirmngr clients won't get
+   disturbed by such events.  */
+static void
+prepare_dirmngr (ctrl_t ctrl, assuan_context_t ctx, gpg_error_t err)
+{
+  struct keyserver_spec *server;
+
+  if (!err)
+    err = warn_version_mismatch (ctrl, ctx, DIRMNGR_NAME, 0);
+
+  if (!err)
+    {
+      err = assuan_transact (ctx, "OPTION audit-events=1",
+			     NULL, NULL, NULL, NULL, NULL, NULL);
+      if (gpg_err_code (err) == GPG_ERR_UNKNOWN_OPTION)
+	err = 0;  /* Allow the use of old dirmngr versions.  */
+    }
+  audit_log_ok (ctrl->audit, AUDIT_DIRMNGR_READY, err);
+
+  if (!ctx || err)
+    return;
+
+  server = opt.keyserver;
+  while (server)
+    {
+      char line[ASSUAN_LINELENGTH];
+      char *user = server->user ? server->user : "";
+      char *pass = server->pass ? server->pass : "";
+      char *base = server->base ? server->base : "";
+
+      snprintf (line, DIM (line), "LDAPSERVER %s:%i:%s:%s:%s",
+		server->host, server->port, user, pass, base);
+
+      assuan_transact (ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
+      /* The code below is not required because we don't return an error.  */
+      /* err = [above call]  */
+      /* if (gpg_err_code (err) == GPG_ERR_ASS_UNKNOWN_CMD) */
+      /*   err = 0;  /\* Allow the use of old dirmngr versions.  *\/ */
+
+      server = server->next;
+    }
+}
+
+
+
+/* Return a new assuan context for a Dirmngr connection.  */
+static gpg_error_t
+start_dirmngr_ext (ctrl_t ctrl, assuan_context_t *ctx_r)
+{
+  gpg_error_t err;
+  assuan_context_t ctx;
+
+  if (opt.disable_dirmngr || ctrl->offline)
+    return gpg_error (GPG_ERR_NO_DIRMNGR);
+
+  if (*ctx_r)
+    return 0;
+
+  /* Note: if you change this to multiple connections, you also need
+     to take care of the implicit option sending caching. */
+
+  err = start_new_dirmngr (&ctx, GPG_ERR_SOURCE_DEFAULT,
+                           opt.dirmngr_program,
+                           opt.autostart, opt.verbose, DBG_IPC,
+                           gpgsm_status2, ctrl);
+  if (!opt.autostart && gpg_err_code (err) == GPG_ERR_NO_DIRMNGR)
+    {
+      static int shown;
+
+      if (!shown)
+        {
+          shown = 1;
+          log_info (_("no dirmngr running in this session\n"));
+        }
+    }
+  prepare_dirmngr (ctrl, ctx, err);
+  if (err)
+    return err;
+
+  *ctx_r = ctx;
+  return 0;
+}
+
+
+static int
+start_dirmngr (ctrl_t ctrl)
+{
+  gpg_error_t err;
+
+  assert (! dirmngr_ctx_locked);
+  dirmngr_ctx_locked = 1;
+
+  err = start_dirmngr_ext (ctrl, &dirmngr_ctx);
+  /* We do not check ERR but the existence of a context because the
+     error might come from a failed command send to the dirmngr.
+     Fixme: Why don't we close the drimngr context if we encountered
+     an error in prepare_dirmngr?  */
+  if (!dirmngr_ctx)
+    dirmngr_ctx_locked = 0;
+  return err;
+}
+
+
+static void
+release_dirmngr (ctrl_t ctrl)
+{
+  (void)ctrl;
+
+  if (!dirmngr_ctx_locked)
+    log_error ("WARNING: trying to release a non-locked dirmngr ctx\n");
+  dirmngr_ctx_locked = 0;
+}
+
+
+static int
+start_dirmngr2 (ctrl_t ctrl)
+{
+  gpg_error_t err;
+
+  assert (! dirmngr2_ctx_locked);
+  dirmngr2_ctx_locked = 1;
+
+  err = start_dirmngr_ext (ctrl, &dirmngr2_ctx);
+  if (!dirmngr2_ctx)
+    dirmngr2_ctx_locked = 0;
+  return err;
+}
+
+
+static void
+release_dirmngr2 (ctrl_t ctrl)
+{
+  (void)ctrl;
+
+  if (!dirmngr2_ctx_locked)
+    log_error ("WARNING: trying to release a non-locked dirmngr2 ctx\n");
+  dirmngr2_ctx_locked = 0;
+}
+
+
+
+/* Handle a SENDCERT inquiry. */
+static gpg_error_t
+inq_certificate (void *opaque, const char *line)
+{
+  struct inq_certificate_parm_s *parm = opaque;
+  const char *s;
+  int rc;
+  size_t n;
+  const unsigned char *der;
+  size_t derlen;
+  int issuer_mode = 0;
+  ksba_sexp_t ski = NULL;
+
+  if ((s = has_leading_keyword (line, "SENDCERT")))
+    {
+      line = s;
+    }
+  else if ((s = has_leading_keyword (line, "SENDCERT_SKI")))
+    {
+      /* Send a certificate where a sourceKeyIdentifier is included. */
+      line = s;
+      ski = make_simple_sexp_from_hexstr (line, &n);
+      line += n;
+      while (*line == ' ')
+        line++;
+    }
+  else if ((s = has_leading_keyword (line, "SENDISSUERCERT")))
+    {
+      line = s;
+      issuer_mode = 1;
+    }
+  else if ((s = has_leading_keyword (line, "ISTRUSTED")))
+    {
+      /* The server is asking us whether the certificate is a trusted
+         root certificate.  */
+      char fpr[41];
+      struct rootca_flags_s rootca_flags;
+
+      line = s;
+
+      for (s=line,n=0; hexdigitp (s); s++, n++)
+        ;
+      if (*s || n != 40)
+        return gpg_error (GPG_ERR_ASS_PARAMETER);
+      for (s=line, n=0; n < 40; s++, n++)
+        fpr[n] = (*s >= 'a')? (*s & 0xdf): *s;
+      fpr[n] = 0;
+
+      if (!gpgsm_agent_istrusted (parm->ctrl, NULL, fpr, &rootca_flags))
+        rc = assuan_send_data (parm->ctx, "1", 1);
+      else
+        rc = 0;
+      return rc;
+    }
+  else
+    {
+      log_error ("unsupported certificate inquiry '%s'\n", line);
+      return gpg_error (GPG_ERR_ASS_UNKNOWN_INQUIRE);
+    }
+
+  if (!*line)
+    { /* Send the current certificate. */
+      der = ksba_cert_get_image (issuer_mode? parm->issuer_cert : parm->cert,
+                                 &derlen);
+      if (!der)
+        rc = gpg_error (GPG_ERR_INV_CERT_OBJ);
+      else
+        rc = assuan_send_data (parm->ctx, der, derlen);
+    }
+  else if (issuer_mode)
+    {
+      log_error ("sending specific issuer certificate back "
+                 "is not yet implemented\n");
+      rc = gpg_error (GPG_ERR_ASS_UNKNOWN_INQUIRE);
+    }
+  else
+    { /* Send the given certificate. */
+      int err;
+      ksba_cert_t cert;
+
+
+      err = gpgsm_find_cert (parm->ctrl, line, ski, &cert, 1);
+      if (err)
+        {
+          log_error ("certificate not found: %s\n", gpg_strerror (err));
+          rc = gpg_error (GPG_ERR_NOT_FOUND);
+        }
+      else
+        {
+          der = ksba_cert_get_image (cert, &derlen);
+          if (!der)
+            rc = gpg_error (GPG_ERR_INV_CERT_OBJ);
+          else
+            rc = assuan_send_data (parm->ctx, der, derlen);
+          ksba_cert_release (cert);
+        }
+    }
+
+  xfree (ski);
+  return rc;
+}
+
+
+/* Take a 20 byte hexencoded string and put it into the provided
+   20 byte buffer FPR in binary format. */
+static int
+unhexify_fpr (const char *hexstr, unsigned char *fpr)
+{
+  const char *s;
+  int n;
+
+  for (s=hexstr, n=0; hexdigitp (s); s++, n++)
+    ;
+  if (*s || (n != 40))
+    return 0; /* no fingerprint (invalid or wrong length). */
+  for (s=hexstr, n=0; *s; s += 2, n++)
+    fpr[n] = xtoi_2 (s);
+  return 1; /* okay */
+}
+
+
+static gpg_error_t
+isvalid_status_cb (void *opaque, const char *line)
+{
+  struct isvalid_status_parm_s *parm = opaque;
+  const char *s;
+
+  if ((s = has_leading_keyword (line, "PROGRESS")))
+    {
+      if (parm->ctrl)
+        {
+          line = s;
+          if (gpgsm_status (parm->ctrl, STATUS_PROGRESS, line))
+            return gpg_error (GPG_ERR_ASS_CANCELED);
+        }
+    }
+  else if ((s = has_leading_keyword (line, "ONLY_VALID_IF_CERT_VALID")))
+    {
+      parm->seen++;
+      if (!*s || !unhexify_fpr (s, parm->fpr))
+        parm->seen++; /* Bumb it to indicate an error. */
+    }
+  return 0;
+}
+
+
+
+
+/* Call the directory manager to check whether the certificate is valid
+   Returns 0 for valid or usually one of the errors:
+
+  GPG_ERR_CERTIFICATE_REVOKED
+  GPG_ERR_NO_CRL_KNOWN
+  GPG_ERR_CRL_TOO_OLD
+
+  Values for USE_OCSP:
+     0 = Do CRL check.
+     1 = Do an OCSP check but fallback to CRL unless CRLS are disabled.
+     2 = Do only an OCSP check using only the default responder.
+ */
+int
+gpgsm_dirmngr_isvalid (ctrl_t ctrl,
+                       ksba_cert_t cert, ksba_cert_t issuer_cert, int use_ocsp)
+{
+  static int did_options;
+  int rc;
+  char *certid, *certfpr;
+  char line[ASSUAN_LINELENGTH];
+  struct inq_certificate_parm_s parm;
+  struct isvalid_status_parm_s stparm;
+
+  rc = start_dirmngr (ctrl);
+  if (rc)
+    return rc;
+
+  certfpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
+  certid = gpgsm_get_certid (cert);
+  if (!certid)
+    {
+      log_error ("error getting the certificate ID\n");
+      release_dirmngr (ctrl);
+      return gpg_error (GPG_ERR_GENERAL);
+    }
+
+  if (opt.verbose > 1)
+    {
+      char *fpr = gpgsm_get_fingerprint_string (cert, GCRY_MD_SHA1);
+      log_info ("asking dirmngr about %s%s\n", fpr,
+                use_ocsp? " (using OCSP)":"");
+      xfree (fpr);
+    }
+
+  parm.ctx = dirmngr_ctx;
+  parm.ctrl = ctrl;
+  parm.cert = cert;
+  parm.issuer_cert = issuer_cert;
+
+  stparm.ctrl = ctrl;
+  stparm.seen = 0;
+  memset (stparm.fpr, 0, 20);
+
+  /* It is sufficient to send the options only once because we have
+   * one connection per process only.  */
+  if (!did_options)
+    {
+      if (opt.force_crl_refresh)
+        assuan_transact (dirmngr_ctx, "OPTION force-crl-refresh=1",
+                         NULL, NULL, NULL, NULL, NULL, NULL);
+      did_options = 1;
+    }
+  snprintf (line, DIM(line), "ISVALID%s%s %s%s%s",
+            use_ocsp == 2 || opt.no_crl_check ? " --only-ocsp":"",
+            use_ocsp == 2? " --force-default-responder":"",
+            certid,
+            use_ocsp? " ":"",
+            use_ocsp? certfpr:"");
+  xfree (certid);
+  xfree (certfpr);
+
+  rc = assuan_transact (dirmngr_ctx, line, NULL, NULL,
+                        inq_certificate, &parm,
+                        isvalid_status_cb, &stparm);
+  if (opt.verbose > 1)
+    log_info ("response of dirmngr: %s\n", rc? gpg_strerror (rc): "okay");
+
+  if (!rc && stparm.seen)
+    {
+      /* Need to also check the certificate validity. */
+      if (stparm.seen != 1)
+        {
+          log_error ("communication problem with dirmngr detected\n");
+          rc = gpg_error (GPG_ERR_INV_CRL);
+        }
+      else
+        {
+          ksba_cert_t rspcert = NULL;
+
+          if (get_cached_cert (dirmngr_ctx, stparm.fpr, &rspcert))
+            {
+              /* Ooops: Something went wrong getting the certificate
+                 from the dirmngr.  Try our own cert store now.  */
+              KEYDB_HANDLE kh;
+
+              kh = keydb_new ();
+              if (!kh)
+                rc = gpg_error (GPG_ERR_ENOMEM);
+              if (!rc)
+                rc = keydb_search_fpr (ctrl, kh, stparm.fpr);
+              if (!rc)
+                rc = keydb_get_cert (kh, &rspcert);
+              if (rc)
+                {
+                  log_error ("unable to find the certificate used "
+                             "by the dirmngr: %s\n", gpg_strerror (rc));
+                  rc = gpg_error (GPG_ERR_INV_CRL);
+                }
+              keydb_release (kh);
+            }
+
+          if (!rc)
+            {
+              rc = gpgsm_cert_use_ocsp_p (rspcert);
+              if (rc)
+                rc = gpg_error (GPG_ERR_INV_CRL);
+              else
+                {
+                  /* Note the no_dirmngr flag: This avoids checking
+                     this certificate over and over again. */
+                  rc = gpgsm_validate_chain (ctrl, rspcert, "", NULL, 0, NULL,
+                                             VALIDATE_FLAG_NO_DIRMNGR, NULL);
+                  if (rc)
+                    {
+                      log_error ("invalid certificate used for CRL/OCSP: %s\n",
+                                 gpg_strerror (rc));
+                      rc = gpg_error (GPG_ERR_INV_CRL);
+                    }
+                }
+            }
+          ksba_cert_release (rspcert);
+        }
+    }
+  release_dirmngr (ctrl);
+  return rc;
+}
+
+
+
+/* Lookup helpers*/
+static gpg_error_t
+lookup_cb (void *opaque, const void *buffer, size_t length)
+{
+  struct lookup_parm_s *parm = opaque;
+  size_t len;
+  char *buf;
+  ksba_cert_t cert;
+  int rc;
+
+  if (parm->error)
+    return 0;
+
+  if (buffer)
+    {
+      put_membuf (&parm->data, buffer, length);
+      return 0;
+    }
+  /* END encountered - process what we have */
+  buf = get_membuf (&parm->data, &len);
+  if (!buf)
+    {
+      parm->error = gpg_error (GPG_ERR_ENOMEM);
+      return 0;
+    }
+
+  rc = ksba_cert_new (&cert);
+  if (rc)
+    {
+      parm->error = rc;
+      return 0;
+    }
+  rc = ksba_cert_init_from_mem (cert, buf, len);
+  if (rc)
+    {
+      log_error ("failed to parse a certificate: %s\n", gpg_strerror (rc));
+    }
+  else
+    {
+      parm->cb (parm->cb_value, cert);
+    }
+
+  ksba_cert_release (cert);
+  init_membuf (&parm->data, 4096);
+  return 0;
+}
+
+/* Return a properly escaped pattern from NAMES.  The only error
+   return is NULL to indicate a malloc failure. */
+static char *
+pattern_from_strlist (strlist_t names)
+{
+  strlist_t sl;
+  int n;
+  const char *s;
+  char *pattern, *p;
+
+  for (n=0, sl=names; sl; sl = sl->next)
+    {
+      for (s=sl->d; *s; s++, n++)
+	{
+          if (*s == '%' || *s == ' ' || *s == '+')
+            n += 2;
+	}
+      n++;
+    }
+
+  p = pattern = xtrymalloc (n+1);
+  if (!pattern)
+    return NULL;
+
+  for (sl=names; sl; sl = sl->next)
+    {
+      for (s=sl->d; *s; s++)
+        {
+          switch (*s)
+            {
+            case '%':
+              *p++ = '%';
+              *p++ = '2';
+              *p++ = '5';
+              break;
+            case ' ':
+              *p++ = '%';
+              *p++ = '2';
+              *p++ = '0';
+              break;
+            case '+':
+              *p++ = '%';
+              *p++ = '2';
+              *p++ = 'B';
+              break;
+            default:
+              *p++ = *s;
+              break;
+            }
+        }
+      *p++ = ' ';
+    }
+  if (p == pattern)
+    *pattern = 0; /* is empty */
+  else
+    p[-1] = '\0'; /* remove trailing blank */
+
+  return pattern;
+}
+
+static gpg_error_t
+lookup_status_cb (void *opaque, const char *line)
+{
+  struct lookup_parm_s *parm = opaque;
+  const char *s;
+
+  if ((s = has_leading_keyword (line, "PROGRESS")))
+    {
+      if (parm->ctrl)
+        {
+          line = s;
+          if (gpgsm_status (parm->ctrl, STATUS_PROGRESS, line))
+            return gpg_error (GPG_ERR_ASS_CANCELED);
+        }
+    }
+  else if ((s = has_leading_keyword (line, "TRUNCATED")))
+    {
+      if (parm->ctrl)
+        {
+          line = s;
+          gpgsm_status (parm->ctrl, STATUS_TRUNCATED, line);
+        }
+    }
+  return 0;
+}
+
+
+/* Run the Directory Manager's lookup command using the pattern
+   compiled from the strings given in NAMES or from URI.  The caller
+   must provide the callback CB which will be passed cert by cert.
+   Note that CTRL is optional.  With CACHE_ONLY the dirmngr will
+   search only its own key cache. */
+int
+gpgsm_dirmngr_lookup (ctrl_t ctrl, strlist_t names, const char *uri,
+                      int cache_only,
+                      void (*cb)(void*, ksba_cert_t), void *cb_value)
+{
+  int rc;
+  char line[ASSUAN_LINELENGTH];
+  struct lookup_parm_s parm;
+  size_t len;
+  assuan_context_t ctx;
+  const char *s;
+
+  if ((names && uri) || (!names && !uri))
+    return gpg_error (GPG_ERR_INV_ARG);
+
+  /* The lookup function can be invoked from the callback of a lookup
+     function, for example to walk the chain.  */
+  if (!dirmngr_ctx_locked)
+    {
+      rc = start_dirmngr (ctrl);
+      if (rc)
+	return rc;
+      ctx = dirmngr_ctx;
+    }
+  else if (!dirmngr2_ctx_locked)
+    {
+      rc = start_dirmngr2 (ctrl);
+      if (rc)
+	return rc;
+      ctx = dirmngr2_ctx;
+    }
+  else
+    {
+      log_fatal ("both dirmngr contexts are in use\n");
+    }
+
+  if (names)
+    {
+      char *pattern = pattern_from_strlist (names);
+      if (!pattern)
+        {
+          if (ctx == dirmngr_ctx)
+            release_dirmngr (ctrl);
+          else
+            release_dirmngr2 (ctrl);
+
+          return out_of_core ();
+        }
+      snprintf (line, DIM(line), "LOOKUP%s %s",
+                cache_only? " --cache-only":"", pattern);
+      xfree (pattern);
+    }
+  else
+    {
+      for (s=uri; *s; s++)
+        if (*s <= ' ')
+          {
+            if (ctx == dirmngr_ctx)
+              release_dirmngr (ctrl);
+            else
+              release_dirmngr2 (ctrl);
+            return gpg_error (GPG_ERR_INV_URI);
+          }
+      snprintf (line, DIM(line), "LOOKUP --url %s", uri);
+    }
+
+  parm.ctrl = ctrl;
+  parm.ctx = ctx;
+  parm.cb = cb;
+  parm.cb_value = cb_value;
+  parm.error = 0;
+  init_membuf (&parm.data, 4096);
+
+  rc = assuan_transact (ctx, line, lookup_cb, &parm,
+                        NULL, NULL, lookup_status_cb, &parm);
+  xfree (get_membuf (&parm.data, &len));
+
+  if (ctx == dirmngr_ctx)
+    release_dirmngr (ctrl);
+  else
+    release_dirmngr2 (ctrl);
+
+  if (rc)
+      return rc;
+  return parm.error;
+}
+
+
+
+static gpg_error_t
+get_cached_cert_data_cb (void *opaque, const void *buffer, size_t length)
+{
+  struct membuf *mb = opaque;
+
+  if (buffer)
+    put_membuf (mb, buffer, length);
+  return 0;
+}
+
+/* Return a certificate from the Directory Manager's cache.  This
+   function only returns one certificate which must be specified using
+   the fingerprint FPR and will be stored at R_CERT.  On error NULL is
+   stored at R_CERT and an error code returned.  Note that the caller
+   must provide the locked dirmngr context CTX. */
+static gpg_error_t
+get_cached_cert (assuan_context_t ctx,
+                 const unsigned char *fpr, ksba_cert_t *r_cert)
+{
+  gpg_error_t err;
+  char line[ASSUAN_LINELENGTH];
+  char hexfpr[2*20+1];
+  struct membuf mb;
+  char *buf;
+  size_t buflen = 0;
+  ksba_cert_t cert;
+
+  *r_cert = NULL;
+
+  bin2hex (fpr, 20, hexfpr);
+  snprintf (line, DIM(line), "LOOKUP --single --cache-only 0x%s", hexfpr);
+
+  init_membuf (&mb, 4096);
+  err = assuan_transact (ctx, line, get_cached_cert_data_cb, &mb,
+                         NULL, NULL, NULL, NULL);
+  buf = get_membuf (&mb, &buflen);
+  if (err)
+    {
+      xfree (buf);
+      return err;
+    }
+  if (!buf)
+    return gpg_error (GPG_ERR_ENOMEM);
+
+  err = ksba_cert_new (&cert);
+  if (err)
+    {
+      xfree (buf);
+      return err;
+    }
+  err = ksba_cert_init_from_mem (cert, buf, buflen);
+  xfree (buf);
+  if (err)
+    {
+      log_error ("failed to parse a certificate: %s\n", gpg_strerror (err));
+      ksba_cert_release (cert);
+      return err;
+    }
+
+  *r_cert = cert;
+  return 0;
+}
+
+
+
+/* Run Command helpers*/
+
+/* Fairly simple callback to write all output of dirmngr to stdout. */
+static gpg_error_t
+run_command_cb (void *opaque, const void *buffer, size_t length)
+{
+  (void)opaque;
+
+  if (buffer)
+    {
+      if ( fwrite (buffer, length, 1, stdout) != 1 )
+        log_error ("error writing to stdout: %s\n", strerror (errno));
+    }
+  return 0;
+}
+
+/* Handle inquiries from the dirmngr COMMAND. */
+static gpg_error_t
+run_command_inq_cb (void *opaque, const char *line)
+{
+  struct run_command_parm_s *parm = opaque;
+  const char *s;
+  int rc = 0;
+
+  if ((s = has_leading_keyword (line, "SENDCERT")))
+    { /* send the given certificate */
+      int err;
+      ksba_cert_t cert;
+      const unsigned char *der;
+      size_t derlen;
+
+      line = s;
+      if (!*line)
+        return gpg_error (GPG_ERR_ASS_PARAMETER);
+
+      err = gpgsm_find_cert (parm->ctrl, line, NULL, &cert, 1);
+      if (err)
+        {
+          log_error ("certificate not found: %s\n", gpg_strerror (err));
+          rc = gpg_error (GPG_ERR_NOT_FOUND);
+        }
+      else
+        {
+          der = ksba_cert_get_image (cert, &derlen);
+          if (!der)
+            rc = gpg_error (GPG_ERR_INV_CERT_OBJ);
+          else
+            rc = assuan_send_data (parm->ctx, der, derlen);
+          ksba_cert_release (cert);
+        }
+    }
+  else if ((s = has_leading_keyword (line, "PRINTINFO")))
+    { /* Simply show the message given in the argument. */
+      line = s;
+      log_info ("dirmngr: %s\n", line);
+    }
+  else if ((s = has_leading_keyword (line, "ISTRUSTED")))
+    {
+      /* The server is asking us whether the certificate is a trusted
+         root certificate.  */
+      char fpr[41];
+      struct rootca_flags_s rootca_flags;
+      int n;
+
+      line = s;
+
+      for (s=line,n=0; hexdigitp (s); s++, n++)
+        ;
+      if (*s || n != 40)
+        return gpg_error (GPG_ERR_ASS_PARAMETER);
+      for (s=line, n=0; n < 40; s++, n++)
+        fpr[n] = (*s >= 'a')? (*s & 0xdf): *s;
+      fpr[n] = 0;
+
+      if (!gpgsm_agent_istrusted (parm->ctrl, NULL, fpr, &rootca_flags))
+        rc = assuan_send_data (parm->ctx, "1", 1);
+      else
+        rc = 0;
+      return rc;
+    }
+  else
+    {
+      log_error ("unsupported command inquiry '%s'\n", line);
+      rc = gpg_error (GPG_ERR_ASS_UNKNOWN_INQUIRE);
+    }
+
+  return rc;
+}
+
+static gpg_error_t
+run_command_status_cb (void *opaque, const char *line)
+{
+  ctrl_t ctrl = opaque;
+  const char *s;
+
+  if (opt.verbose)
+    {
+      log_info ("dirmngr status: %s\n", line);
+    }
+  if ((s = has_leading_keyword (line, "PROGRESS")))
+    {
+      if (ctrl)
+        {
+          line = s;
+          if (gpgsm_status (ctrl, STATUS_PROGRESS, line))
+            return gpg_error (GPG_ERR_ASS_CANCELED);
+        }
+    }
+  return 0;
+}
+
+
+
+/* Pass COMMAND to dirmngr and print all output generated by Dirmngr
+   to stdout.  A couple of inquiries are defined (see above).  ARGC
+   arguments in ARGV are given to the Dirmngr.  Spaces, plus and
+   percent characters within the argument strings are percent escaped
+   so that blanks can act as delimiters. */
+int
+gpgsm_dirmngr_run_command (ctrl_t ctrl, const char *command,
+                           int argc, char **argv)
+{
+  int rc;
+  int i;
+  const char *s;
+  char *line, *p;
+  size_t len;
+  struct run_command_parm_s parm;
+
+  rc = start_dirmngr (ctrl);
+  if (rc)
+    return rc;
+
+  parm.ctrl = ctrl;
+  parm.ctx = dirmngr_ctx;
+
+  len = strlen (command) + 1;
+  for (i=0; i < argc; i++)
+    len += 1 + 3*strlen (argv[i]); /* enough space for percent escaping */
+  line = xtrymalloc (len);
+  if (!line)
+    {
+      release_dirmngr (ctrl);
+      return out_of_core ();
+    }
+
+  p = stpcpy (line, command);
+  for (i=0; i < argc; i++)
+    {
+      *p++ = ' ';
+      for (s=argv[i]; *s; s++)
+        {
+          if (!isascii (*s))
+            *p++ = *s;
+          else if (*s == ' ')
+            *p++ = '+';
+          else if (!isprint (*s) || *s == '+')
+            {
+              sprintf (p, "%%%02X", *(const unsigned char *)s);
+              p += 3;
+            }
+          else
+            *p++ = *s;
+        }
+    }
+  *p = 0;
+
+  rc = assuan_transact (dirmngr_ctx, line,
+                        run_command_cb, NULL,
+                        run_command_inq_cb, &parm,
+                        run_command_status_cb, ctrl);
+  xfree (line);
+  log_info ("response of dirmngr: %s\n", rc? gpg_strerror (rc): "okay");
+  release_dirmngr (ctrl);
+  return rc;
+}