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-rw-r--r--tools/call-dirmngr.c381
1 files changed, 381 insertions, 0 deletions
diff --git a/tools/call-dirmngr.c b/tools/call-dirmngr.c
new file mode 100644
index 0000000..4eef9b2
--- /dev/null
+++ b/tools/call-dirmngr.c
@@ -0,0 +1,381 @@
+/* call-dirmngr.c - Interact with the Dirmngr.
+ * Copyright (C) 2016, 2022 g10 Code GmbH
+ * Copyright (C) 2016 Bundesamt für Sicherheit in der Informationstechnik
+ *
+ * This file is part of GnuPG.
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This file 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser 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>
+#ifdef HAVE_LOCALE_H
+# include <locale.h>
+#endif
+
+#include <assuan.h>
+#include "../common/util.h"
+#include "../common/i18n.h"
+#include "../common/asshelp.h"
+#include "../common/mbox-util.h"
+#include "./call-dirmngr.h"
+
+static struct
+{
+ int verbose;
+ int debug_ipc;
+ int autostart;
+} opt;
+
+
+
+void
+set_dirmngr_options (int verbose, int debug_ipc, int autostart)
+{
+ opt.verbose = verbose;
+ opt.debug_ipc = debug_ipc;
+ opt.autostart = autostart;
+}
+
+
+/* Connect to the Dirmngr and return an assuan context. */
+static gpg_error_t
+connect_dirmngr (assuan_context_t *r_ctx)
+{
+ gpg_error_t err;
+ assuan_context_t ctx;
+
+ *r_ctx = NULL;
+ err = start_new_dirmngr (&ctx,
+ GPG_ERR_SOURCE_DEFAULT,
+ NULL,
+ opt.autostart, opt.verbose, opt.debug_ipc,
+ NULL, NULL);
+ 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"));
+ }
+ }
+
+ if (err)
+ assuan_release (ctx);
+ else
+ {
+ *r_ctx = ctx;
+ }
+
+ return err;
+}
+
+
+
+
+/* Parameter structure used with the WKD_GET command. */
+struct wkd_get_parm_s
+{
+ estream_t memfp;
+};
+
+
+/* Data callback for the WKD_GET command. */
+static gpg_error_t
+wkd_get_data_cb (void *opaque, const void *data, size_t datalen)
+{
+ struct wkd_get_parm_s *parm = opaque;
+ gpg_error_t err = 0;
+ size_t nwritten;
+
+ if (!data)
+ return 0; /* Ignore END commands. */
+ if (!parm->memfp)
+ return 0; /* Data is not required. */
+
+ if (es_write (parm->memfp, data, datalen, &nwritten))
+ err = gpg_error_from_syserror ();
+
+ return err;
+}
+
+
+/* Status callback for the WKD_GET command. */
+static gpg_error_t
+wkd_get_status_cb (void *opaque, const char *line)
+{
+ struct wkd_get_parm_s *parm = opaque;
+ gpg_error_t err = 0;
+
+ (void)line;
+ (void)parm;
+
+ return err;
+}
+
+
+/* Ask the dirmngr for the submission address of a WKD server for the
+ * mail address ADDRSPEC. On success the submission address is stored
+ * at R_ADDRSPEC. */
+gpg_error_t
+wkd_get_submission_address (const char *addrspec, char **r_addrspec)
+{
+ gpg_error_t err;
+ assuan_context_t ctx;
+ struct wkd_get_parm_s parm;
+ char *line = NULL;
+ void *vp;
+ char *buffer = NULL;
+ char *p;
+
+ memset (&parm, 0, sizeof parm);
+ *r_addrspec = NULL;
+
+ err = connect_dirmngr (&ctx);
+ if (err)
+ return err;
+
+ line = es_bsprintf ("WKD_GET --submission-address -- %s", addrspec);
+ if (!line)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ if (strlen (line) + 2 >= ASSUAN_LINELENGTH)
+ {
+ err = gpg_error (GPG_ERR_TOO_LARGE);
+ goto leave;
+ }
+
+ parm.memfp = es_fopenmem (0, "rwb");
+ if (!parm.memfp)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ err = assuan_transact (ctx, line, wkd_get_data_cb, &parm,
+ NULL, NULL, wkd_get_status_cb, &parm);
+ if (err)
+ goto leave;
+
+ es_fputc (0, parm.memfp);
+ if (es_fclose_snatch (parm.memfp, &vp, NULL))
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ buffer = vp;
+ parm.memfp = NULL;
+ p = strchr (buffer, '\n');
+ if (p)
+ *p = 0;
+ trim_spaces (buffer);
+ if (!is_valid_mailbox (buffer))
+ {
+ err = gpg_error (GPG_ERR_INV_USER_ID);
+ goto leave;
+ }
+ *r_addrspec = xtrystrdup (buffer);
+ if (!*r_addrspec)
+ err = gpg_error_from_syserror ();
+
+ leave:
+ es_free (buffer);
+ es_fclose (parm.memfp);
+ xfree (line);
+ assuan_release (ctx);
+ return err;
+}
+
+
+/* Ask the dirmngr for the policy flags and return them as an estream
+ * memory stream. If no policy flags are set, NULL is stored at
+ * R_BUFFER. */
+gpg_error_t
+wkd_get_policy_flags (const char *addrspec, estream_t *r_buffer)
+{
+ gpg_error_t err;
+ assuan_context_t ctx;
+ struct wkd_get_parm_s parm;
+ char *line = NULL;
+ char *buffer = NULL;
+
+ memset (&parm, 0, sizeof parm);
+ *r_buffer = NULL;
+
+ err = connect_dirmngr (&ctx);
+ if (err)
+ return err;
+
+ line = es_bsprintf ("WKD_GET --policy-flags -- %s", addrspec);
+ if (!line)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ if (strlen (line) + 2 >= ASSUAN_LINELENGTH)
+ {
+ err = gpg_error (GPG_ERR_TOO_LARGE);
+ goto leave;
+ }
+
+ parm.memfp = es_fopenmem (0, "rwb");
+ if (!parm.memfp)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ err = assuan_transact (ctx, line, wkd_get_data_cb, &parm,
+ NULL, NULL, wkd_get_status_cb, &parm);
+ if (err)
+ goto leave;
+
+ es_rewind (parm.memfp);
+ *r_buffer = parm.memfp;
+ parm.memfp = 0;
+
+ leave:
+ es_free (buffer);
+ es_fclose (parm.memfp);
+ xfree (line);
+ assuan_release (ctx);
+ return err;
+}
+
+
+/* Ask the dirmngr for the key for ADDRSPEC. On success a stream with
+ * the key is stored at R_KEY. */
+gpg_error_t
+wkd_get_key (const char *addrspec, estream_t *r_key)
+{
+ gpg_error_t err;
+ assuan_context_t ctx;
+ struct wkd_get_parm_s parm;
+ char *line = NULL;
+
+ memset (&parm, 0, sizeof parm);
+ *r_key = NULL;
+
+ err = connect_dirmngr (&ctx);
+ if (err)
+ return err;
+
+ line = es_bsprintf ("WKD_GET -- %s", addrspec);
+ if (!line)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ if (strlen (line) + 2 >= ASSUAN_LINELENGTH)
+ {
+ err = gpg_error (GPG_ERR_TOO_LARGE);
+ goto leave;
+ }
+
+ parm.memfp = es_fopenmem (0, "rwb");
+ if (!parm.memfp)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ err = assuan_transact (ctx, line, wkd_get_data_cb, &parm,
+ NULL, NULL, wkd_get_status_cb, &parm);
+ if (err)
+ goto leave;
+
+ es_rewind (parm.memfp);
+ *r_key = parm.memfp;
+ parm.memfp = NULL;
+
+ leave:
+ es_fclose (parm.memfp);
+ xfree (line);
+ assuan_release (ctx);
+ return err;
+}
+
+
+/* Send the KS_GET command to the dirmngr. The caller provides CB
+ * which is called for each key. The callback is called wit a stream
+ * conveying a single key and several other informational parameters.
+ * DOMAIN restricts the returned keys to this domain. */
+gpg_error_t
+wkd_dirmngr_ks_get (const char *domain, gpg_error_t cb (estream_t key))
+{
+ gpg_error_t err;
+ assuan_context_t ctx;
+ struct wkd_get_parm_s parm;
+ char *line = NULL;
+ int any = 0;
+
+ memset (&parm, 0, sizeof parm);
+
+ err = connect_dirmngr (&ctx);
+ if (err)
+ return err;
+
+ line = es_bsprintf ("KS_GET --ldap --first %s", domain? domain:"");
+ if (!line)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ if (strlen (line) + 2 >= ASSUAN_LINELENGTH)
+ {
+ err = gpg_error (GPG_ERR_TOO_LARGE);
+ goto leave;
+ }
+
+ parm.memfp = es_fopenmem (0, "rwb");
+ if (!parm.memfp)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+
+ for (;;)
+ {
+ err = assuan_transact (ctx, any? "KS_GET --next" : line,
+ wkd_get_data_cb, &parm,
+ NULL, NULL, wkd_get_status_cb, &parm);
+ if (err)
+ {
+ if (gpg_err_code (err) == GPG_ERR_NO_DATA
+ && gpg_err_source (err) == GPG_ERR_SOURCE_DIRMNGR)
+ err = any? 0 : gpg_error (GPG_ERR_NOT_FOUND);
+ goto leave;
+ }
+ any = 1;
+
+ es_rewind (parm.memfp);
+ err = cb (parm.memfp);
+ if (err)
+ break;
+ es_ftruncate (parm.memfp, 0);
+ }
+
+
+ leave:
+ es_fclose (parm.memfp);
+ xfree (line);
+ assuan_release (ctx);
+ return err;
+}
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