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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:14:06 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:14:06 +0000
commiteee068778cb28ecf3c14e1bf843a95547d72c42d (patch)
tree0e07b30ddc5ea579d682d5dbe57998200d1c9ab7 /g10/call-dirmngr.c
parentInitial commit. (diff)
downloadgnupg2-eee068778cb28ecf3c14e1bf843a95547d72c42d.tar.xz
gnupg2-eee068778cb28ecf3c14e1bf843a95547d72c42d.zip
Adding upstream version 2.2.40.upstream/2.2.40upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--g10/call-dirmngr.c1401
1 files changed, 1401 insertions, 0 deletions
diff --git a/g10/call-dirmngr.c b/g10/call-dirmngr.c
new file mode 100644
index 0000000..ef91c54
--- /dev/null
+++ b/g10/call-dirmngr.c
@@ -0,0 +1,1401 @@
+/* call-dirmngr.c - GPG operations to the Dirmngr.
+ * Copyright (C) 2011 Free Software Foundation, Inc.
+ * Copyright (C) 2015 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/>.
+ */
+
+#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 "gpg.h"
+#include <assuan.h>
+#include "../common/util.h"
+#include "../common/membuf.h"
+#include "options.h"
+#include "../common/i18n.h"
+#include "../common/asshelp.h"
+#include "../common/status.h"
+#include "keyserver-internal.h"
+#include "call-dirmngr.h"
+
+
+/* Keys retrieved from the web key directory should be small. There
+ * is only one UID and we can expect that the number of subkeys is
+ * reasonable. So we set a generous limit of 256 KiB. */
+#define MAX_WKD_RESULT_LENGTH (256 * 1024)
+
+
+/* Parameter structure used to gather status info. Note that it is
+ * also used for WKD requests. */
+struct ks_status_parm_s
+{
+ const char *keyword; /* Look for this keyword or NULL for "SOURCE". */
+ char *source;
+};
+
+
+/* Parameter structure used with the KS_SEARCH command. */
+struct ks_search_parm_s
+{
+ gpg_error_t lasterr; /* Last error code. */
+ membuf_t saveddata; /* Buffer to build complete lines. */
+ char *helpbuf; /* NULL or malloced buffer. */
+ size_t helpbufsize; /* Allocated size of HELPBUF. */
+ gpg_error_t (*data_cb)(void*, int, char*); /* Callback. */
+ void *data_cb_value; /* First argument for DATA_CB. */
+ struct ks_status_parm_s *stparm; /* Link to the status parameter. */
+};
+
+
+/* Parameter structure used with the KS_GET command. */
+struct ks_get_parm_s
+{
+ estream_t memfp;
+};
+
+
+/* Parameter structure used with the KS_PUT command. */
+struct ks_put_parm_s
+{
+ assuan_context_t ctx;
+ kbnode_t keyblock; /* The optional keyblock. */
+ const void *data; /* The key in OpenPGP binary format. */
+ size_t datalen; /* The length of DATA. */
+};
+
+
+/* Parameter structure used with the DNS_CERT command. */
+struct dns_cert_parm_s
+{
+ estream_t memfp;
+ unsigned char *fpr;
+ size_t fprlen;
+ char *url;
+};
+
+
+/* Data used to associate an session with dirmngr contexts. We can't
+ use a simple one to one mapping because we sometimes need two
+ connections to the dirmngr; for example while doing a listing and
+ being in a data callback we may want to retrieve a key. The local
+ dirmngr data takes care of this. At the end of the session the
+ function dirmngr_deinit_session_data is called by gpg.c to cleanup
+ these resources. Note that gpg.h defines a typedef dirmngr_local_t
+ for this structure. */
+struct dirmngr_local_s
+{
+ /* Link to other contexts which are used simultaneously. */
+ struct dirmngr_local_s *next;
+
+ /* The active Assuan context. */
+ assuan_context_t ctx;
+
+ /* Flag set when the keyserver names have been send. */
+ int set_keyservers_done;
+
+ /* Flag set to true while an operation is running on CTX. */
+ int is_active;
+};
+
+
+
+/* Deinitialize all session data of dirmngr pertaining to CTRL. */
+void
+gpg_dirmngr_deinit_session_data (ctrl_t ctrl)
+{
+ dirmngr_local_t dml;
+
+ while ((dml = ctrl->dirmngr_local))
+ {
+ ctrl->dirmngr_local = dml->next;
+ if (dml->is_active)
+ log_error ("oops: trying to cleanup an active dirmngr context\n");
+ else
+ assuan_release (dml->ctx);
+ xfree (dml);
+ }
+}
+
+
+/* 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 (assuan_context_t ctx, const char *servername)
+{
+ gpg_error_t err;
+ char *serverversion;
+ const char *myversion = strusage (13);
+
+ err = get_assuan_server_version (ctx, 0, &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");
+ }
+
+ write_status_strings (STATUS_WARNING, "server_version_mismatch 0",
+ " ", warn, NULL);
+ xfree (warn);
+ }
+ }
+ xfree (serverversion);
+ return err;
+}
+
+
+/* Try to connect to the Dirmngr via a socket or spawn it if possible.
+ Handle the server's initial greeting and set global options. */
+static gpg_error_t
+create_context (ctrl_t ctrl, assuan_context_t *r_ctx)
+{
+ gpg_error_t err;
+ assuan_context_t ctx;
+
+ *r_ctx = NULL;
+
+ if (opt.disable_dirmngr)
+ return gpg_error (GPG_ERR_NO_DIRMNGR);
+
+ err = start_new_dirmngr (&ctx,
+ GPG_ERR_SOURCE_DEFAULT,
+ opt.dirmngr_program,
+ opt.autostart, opt.verbose, DBG_IPC,
+ NULL /*gpg_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"));
+ }
+ }
+ else if (!err && !(err = warn_version_mismatch (ctx, DIRMNGR_NAME)))
+ {
+ char *line;
+
+ /* Tell the dirmngr that we want to collect audit event. */
+ /* err = assuan_transact (agent_ctx, "OPTION audit-events=1", */
+ /* NULL, NULL, NULL, NULL, NULL, NULL); */
+ if (opt.keyserver_options.http_proxy)
+ {
+ line = xtryasprintf ("OPTION http-proxy=%s",
+ opt.keyserver_options.http_proxy);
+ if (!line)
+ err = gpg_error_from_syserror ();
+ else
+ {
+ err = assuan_transact (ctx, line, NULL, NULL, NULL,
+ NULL, NULL, NULL);
+ xfree (line);
+ }
+ }
+
+ if (err)
+ ;
+ else if ((opt.keyserver_options.options & KEYSERVER_HONOR_KEYSERVER_URL))
+ {
+ /* Tell the dirmngr that this possibly privacy invading
+ option is in use. If Dirmngr is running in Tor mode, it
+ will return an error. */
+ err = assuan_transact (ctx, "OPTION honor-keyserver-url-used",
+ NULL, NULL, NULL, NULL, NULL, NULL);
+ if (gpg_err_code (err) == GPG_ERR_FORBIDDEN)
+ log_error (_("keyserver option \"%s\""
+ " may not be used in %s mode\n"),
+ "honor-keyserver-url", "Tor");
+ else if (gpg_err_code (err) == GPG_ERR_UNKNOWN_OPTION)
+ err = 0; /* Old dirmngr versions do not support this option. */
+ }
+ }
+
+ if (err)
+ assuan_release (ctx);
+ else
+ {
+ /* audit_log_ok (ctrl->audit, AUDIT_DIRMNGR_READY, err); */
+ *r_ctx = ctx;
+ }
+
+ return err;
+}
+
+
+/* Get a context for accessing dirmngr. If no context is available a
+ new one is created and - if required - dirmngr started. On success
+ an assuan context is stored at R_CTX. This context may only be
+ released by means of close_context. Note that NULL is stored at
+ R_CTX on error. */
+static gpg_error_t
+open_context (ctrl_t ctrl, assuan_context_t *r_ctx)
+{
+ gpg_error_t err;
+ dirmngr_local_t dml;
+
+ *r_ctx = NULL;
+ for (;;)
+ {
+ for (dml = ctrl->dirmngr_local; dml && dml->is_active; dml = dml->next)
+ ;
+ if (dml)
+ {
+ /* Found an inactive local session - return that. */
+ log_assert (!dml->is_active);
+
+ /* But first do the per session init if not yet done. */
+ if (!dml->set_keyservers_done)
+ {
+ keyserver_spec_t ksi;
+
+ /* Set all configured keyservers. We clear existing
+ keyservers so that any keyserver configured in GPG
+ overrides keyservers possibly still configured in Dirmngr
+ for the session (Note that the keyserver list of a
+ session in Dirmngr survives a RESET. */
+ for (ksi = opt.keyserver; ksi; ksi = ksi->next)
+ {
+ char *line;
+
+ line = xtryasprintf
+ ("KEYSERVER%s %s",
+ ksi == opt.keyserver? " --clear":"", ksi->uri);
+ if (!line)
+ err = gpg_error_from_syserror ();
+ else
+ {
+ err = assuan_transact (dml->ctx, line, NULL, NULL, NULL,
+ NULL, NULL, NULL);
+ xfree (line);
+ }
+
+ if (err)
+ return err;
+ }
+
+ dml->set_keyservers_done = 1;
+ }
+
+ dml->is_active = 1;
+
+ *r_ctx = dml->ctx;
+ return 0;
+ }
+
+ dml = xtrycalloc (1, sizeof *dml);
+ if (!dml)
+ return gpg_error_from_syserror ();
+ err = create_context (ctrl, &dml->ctx);
+ if (err)
+ {
+ xfree (dml);
+ return err;
+ }
+
+ /* To be on the nPth thread safe site we need to add it to a
+ list; this is far easier than to have a lock for this
+ function. It should not happen anyway but the code is free
+ because we need it for the is_active check above. */
+ dml->next = ctrl->dirmngr_local;
+ ctrl->dirmngr_local = dml;
+ }
+}
+
+
+/* Close the assuan context CTX or return it to a pool of unused
+ contexts. If CTX is NULL, the function does nothing. */
+static void
+close_context (ctrl_t ctrl, assuan_context_t ctx)
+{
+ dirmngr_local_t dml;
+
+ if (!ctx)
+ return;
+
+ for (dml = ctrl->dirmngr_local; dml; dml = dml->next)
+ {
+ if (dml->ctx == ctx)
+ {
+ if (!dml->is_active)
+ log_fatal ("closing inactive dirmngr context %p\n", ctx);
+ dml->is_active = 0;
+ return;
+ }
+ }
+ log_fatal ("closing unknown dirmngr ctx %p\n", ctx);
+}
+
+
+/* Clear the set_keyservers_done flag on context CTX. */
+static void
+clear_context_flags (ctrl_t ctrl, assuan_context_t ctx)
+{
+ dirmngr_local_t dml;
+
+ if (!ctx)
+ return;
+
+ for (dml = ctrl->dirmngr_local; dml; dml = dml->next)
+ {
+ if (dml->ctx == ctx)
+ {
+ if (!dml->is_active)
+ log_fatal ("clear_context_flags on inactive dirmngr ctx %p\n", ctx);
+ dml->set_keyservers_done = 0;
+ return;
+ }
+ }
+ log_fatal ("clear_context_flags on unknown dirmngr ctx %p\n", ctx);
+}
+
+
+
+/* Status callback for ks_list, ks_get, ks_search, and wkd_get */
+static gpg_error_t
+ks_status_cb (void *opaque, const char *line)
+{
+ struct ks_status_parm_s *parm = opaque;
+ gpg_error_t err = 0;
+ const char *s, *s2;
+ const char *warn = NULL;
+ int is_note = 0;
+ char *p;
+
+ if ((s = has_leading_keyword (line, parm->keyword? parm->keyword : "SOURCE")))
+ {
+ /* Note that the arg for "S SOURCE" is the URL of a keyserver. */
+ if (!parm->source)
+ {
+ parm->source = xtrystrdup (s);
+ if (!parm->source)
+ err = gpg_error_from_syserror ();
+ else
+ {
+ p = strchr (parm->source, ':');
+ if (p && p[1] == '/' && p[2] == '/')
+ {
+ /* This is a real URL like "ldap://foo:389/bla,bla"
+ * Strip off the local part. */
+ if ((p = strchr (p+3, '/')))
+ *p = 0;
+ }
+ else
+ {
+ /* This is an LDAP config entry like
+ * "foo:389:user:pass:base:flags"
+ * we strip off everything beyound the port. */
+ if ((p = strchr (p+1, ':')))
+ {
+ if (p[-1] == ':')
+ p[-1] = 0; /* No port given. */
+ else
+ *p = 0;
+ }
+ }
+ }
+ }
+ }
+ else if ((s = has_leading_keyword (line, "WARNING"))
+ || (is_note = !!(s = has_leading_keyword (line, "NOTE"))))
+ {
+ if ((s2 = has_leading_keyword (s, "wkd_cached_result")))
+ {
+ if (opt.verbose)
+ warn = _("WKD uses a cached result");
+ }
+ else if ((s2 = has_leading_keyword (s, "tor_not_running")))
+ warn = _("Tor is not running");
+ else if ((s2 = has_leading_keyword (s, "tor_config_problem")))
+ warn = _("Tor is not properly configured");
+ else if ((s2 = has_leading_keyword (s, "dns_config_problem")))
+ warn = _("DNS is not properly configured");
+ else if ((s2 = has_leading_keyword (s, "http_redirect")))
+ warn = _("unacceptable HTTP redirect from server");
+ else if ((s2 = has_leading_keyword (s, "http_redirect_cleanup")))
+ warn = _("unacceptable HTTP redirect from server was cleaned up");
+ else if ((s2 = has_leading_keyword (s, "tls_cert_error")))
+ warn = _("server uses an invalid certificate");
+ else
+ warn = NULL;
+
+ if (warn)
+ {
+ if (is_note)
+ log_info (_("Note: %s\n"), warn);
+ else
+ log_info (_("WARNING: %s\n"), warn);
+ if (s2)
+ {
+ while (*s2 && !spacep (s2))
+ s2++;
+ while (*s2 && spacep (s2))
+ s2++;
+ if (*s2)
+ print_further_info ("%s", s2);
+ }
+ }
+ }
+
+ return err;
+}
+
+
+
+/* Run the "KEYSERVER" command to return the name of the used
+ keyserver at R_KEYSERVER. */
+gpg_error_t
+gpg_dirmngr_ks_list (ctrl_t ctrl, char **r_keyserver)
+{
+ gpg_error_t err;
+ assuan_context_t ctx;
+ struct ks_status_parm_s stparm;
+
+ memset (&stparm, 0, sizeof stparm);
+ stparm.keyword = "KEYSERVER";
+ if (r_keyserver)
+ *r_keyserver = NULL;
+
+ err = open_context (ctrl, &ctx);
+ if (err)
+ return err;
+
+ err = assuan_transact (ctx, "KEYSERVER", NULL, NULL,
+ NULL, NULL, ks_status_cb, &stparm);
+ if (err)
+ goto leave;
+ if (!stparm.source)
+ {
+ err = gpg_error (GPG_ERR_NO_KEYSERVER);
+ goto leave;
+ }
+
+ if (r_keyserver)
+ *r_keyserver = stparm.source;
+ else
+ xfree (stparm.source);
+ stparm.source = NULL;
+
+ leave:
+ xfree (stparm.source);
+ close_context (ctrl, ctx);
+ return err;
+}
+
+
+
+/* Data callback for the KS_SEARCH command. */
+static gpg_error_t
+ks_search_data_cb (void *opaque, const void *data, size_t datalen)
+{
+ gpg_error_t err = 0;
+ struct ks_search_parm_s *parm = opaque;
+ const char *line, *s;
+ size_t rawlen, linelen;
+ char fixedbuf[256];
+
+ if (parm->lasterr)
+ return 0;
+
+ if (parm->stparm->source)
+ {
+ err = parm->data_cb (parm->data_cb_value, 1, parm->stparm->source);
+ if (err)
+ {
+ parm->lasterr = err;
+ return err;
+ }
+ /* Clear it so that we won't get back here unless the server
+ accidentally sends a second source status line. Note that
+ will not see all accidentally sent source lines because it
+ depends on whether data lines have been send in between. */
+ xfree (parm->stparm->source);
+ parm->stparm->source = NULL;
+ }
+
+ if (!data)
+ return 0; /* Ignore END commands. */
+
+ put_membuf (&parm->saveddata, data, datalen);
+
+ again:
+ line = peek_membuf (&parm->saveddata, &rawlen);
+ if (!line)
+ {
+ parm->lasterr = gpg_error_from_syserror ();
+ return parm->lasterr; /* Tell the server about our problem. */
+ }
+ if ((s = memchr (line, '\n', rawlen)))
+ {
+ linelen = s - line; /* That is the length excluding the LF. */
+ if (linelen + 1 < sizeof fixedbuf)
+ {
+ /* We can use the static buffer. */
+ memcpy (fixedbuf, line, linelen);
+ fixedbuf[linelen] = 0;
+ if (linelen && fixedbuf[linelen-1] == '\r')
+ fixedbuf[linelen-1] = 0;
+ err = parm->data_cb (parm->data_cb_value, 0, fixedbuf);
+ }
+ else
+ {
+ if (linelen + 1 >= parm->helpbufsize)
+ {
+ xfree (parm->helpbuf);
+ parm->helpbufsize = linelen + 1 + 1024;
+ parm->helpbuf = xtrymalloc (parm->helpbufsize);
+ if (!parm->helpbuf)
+ {
+ parm->lasterr = gpg_error_from_syserror ();
+ return parm->lasterr;
+ }
+ }
+ memcpy (parm->helpbuf, line, linelen);
+ parm->helpbuf[linelen] = 0;
+ if (linelen && parm->helpbuf[linelen-1] == '\r')
+ parm->helpbuf[linelen-1] = 0;
+ err = parm->data_cb (parm->data_cb_value, 0, parm->helpbuf);
+ }
+ if (err)
+ parm->lasterr = err;
+ else
+ {
+ clear_membuf (&parm->saveddata, linelen+1);
+ goto again; /* There might be another complete line. */
+ }
+ }
+
+ return err;
+}
+
+
+/* Run the KS_SEARCH command using the search string SEARCHSTR. All
+ data lines are passed to the CB function. That function is called
+ with CB_VALUE as its first argument, a 0 as second argument, and
+ the decoded data line as third argument. The callback function may
+ modify the data line and it is guaranteed that this data line is a
+ complete line with a terminating 0 character but without the
+ linefeed. NULL is passed to the callback to indicate EOF. */
+gpg_error_t
+gpg_dirmngr_ks_search (ctrl_t ctrl, const char *searchstr,
+ gpg_error_t (*cb)(void*, int, char *), void *cb_value)
+{
+ gpg_error_t err;
+ assuan_context_t ctx;
+ struct ks_status_parm_s stparm;
+ struct ks_search_parm_s parm;
+ char line[ASSUAN_LINELENGTH];
+
+ err = open_context (ctrl, &ctx);
+ if (err)
+ return err;
+
+ {
+ char *escsearchstr = percent_plus_escape (searchstr);
+ if (!escsearchstr)
+ {
+ err = gpg_error_from_syserror ();
+ close_context (ctrl, ctx);
+ return err;
+ }
+ snprintf (line, sizeof line, "KS_SEARCH -- %s", escsearchstr);
+ xfree (escsearchstr);
+ }
+
+ memset (&stparm, 0, sizeof stparm);
+ memset (&parm, 0, sizeof parm);
+ init_membuf (&parm.saveddata, 1024);
+ parm.data_cb = cb;
+ parm.data_cb_value = cb_value;
+ parm.stparm = &stparm;
+
+ err = assuan_transact (ctx, line, ks_search_data_cb, &parm,
+ NULL, NULL, ks_status_cb, &stparm);
+ if (!err)
+ err = cb (cb_value, 0, NULL); /* Send EOF. */
+ else if (parm.stparm->source)
+ {
+ /* Error but we received a SOURCE status. Tell via callback but
+ * ignore errors. */
+ parm.data_cb (parm.data_cb_value, 1, parm.stparm->source);
+ }
+
+ xfree (get_membuf (&parm.saveddata, NULL));
+ xfree (parm.helpbuf);
+ xfree (stparm.source);
+
+ close_context (ctrl, ctx);
+ return err;
+}
+
+
+
+/* Data callback for the KS_GET and KS_FETCH commands. */
+static gpg_error_t
+ks_get_data_cb (void *opaque, const void *data, size_t datalen)
+{
+ gpg_error_t err = 0;
+ struct ks_get_parm_s *parm = opaque;
+ size_t nwritten;
+
+ if (!data)
+ return 0; /* Ignore END commands. */
+
+ if (es_write (parm->memfp, data, datalen, &nwritten))
+ err = gpg_error_from_syserror ();
+
+ return err;
+}
+
+
+/* Run the KS_GET command using the patterns in the array PATTERN. On
+ success an estream object is returned to retrieve the keys. On
+ error an error code is returned and NULL stored at R_FP.
+
+ The pattern may only use search specification which a keyserver can
+ use to retrieve keys. Because we know the format of the pattern we
+ don't need to escape the patterns before sending them to the
+ server.
+
+ Bit values for FLAGS are:
+ - KEYSERVER_IMPORT_FLAG_QUICK :: dirmngr shall use a shorter timeout.
+ - KEYSERVER_IMPORT_FLAG_LDAP :: dirmngr shall only use LDAP or NTDS.
+
+ If R_SOURCE is not NULL the source of the data is stored as a
+ malloced string there. If a source is not known NULL is stored.
+ Note that this may even be returned after an error.
+
+ If there are too many patterns the function returns an error. That
+ could be fixed by issuing several search commands or by
+ implementing a different interface. However with long keyids we
+ are able to ask for (1000-10-1)/(2+8+1) = 90 keys at once. */
+gpg_error_t
+gpg_dirmngr_ks_get (ctrl_t ctrl, char **pattern,
+ keyserver_spec_t override_keyserver,
+ unsigned int flags,
+ estream_t *r_fp, char **r_source)
+{
+ gpg_error_t err;
+ assuan_context_t ctx;
+ struct ks_status_parm_s stparm;
+ struct ks_get_parm_s parm;
+ char *line = NULL;
+ size_t linelen;
+ membuf_t mb;
+ int idx;
+
+ memset (&stparm, 0, sizeof stparm);
+ memset (&parm, 0, sizeof parm);
+
+ *r_fp = NULL;
+ if (r_source)
+ *r_source = NULL;
+
+ err = open_context (ctrl, &ctx);
+ if (err)
+ return err;
+
+ /* If we have an override keyserver we first indicate that the next
+ user of the context needs to again setup the global keyservers and
+ then we send the override keyserver. */
+ if (override_keyserver)
+ {
+ clear_context_flags (ctrl, ctx);
+ line = xtryasprintf ("KEYSERVER --clear %s", override_keyserver->uri);
+ if (!line)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ err = assuan_transact (ctx, line, NULL, NULL, NULL,
+ NULL, NULL, NULL);
+ if (err)
+ goto leave;
+
+ xfree (line);
+ line = NULL;
+ }
+
+ /* Lump all patterns into one string. */
+ init_membuf (&mb, 1024);
+ put_membuf_str (&mb, "KS_GET");
+ if ((flags & KEYSERVER_IMPORT_FLAG_QUICK))
+ put_membuf_str (&mb, " --quick");
+ if ((flags & KEYSERVER_IMPORT_FLAG_LDAP))
+ put_membuf_str (&mb, " --ldap");
+ put_membuf_str (&mb, " --");
+ for (idx=0; pattern[idx]; idx++)
+ {
+ put_membuf (&mb, " ", 1); /* Append Delimiter. */
+ put_membuf_str (&mb, pattern[idx]);
+ }
+ put_membuf (&mb, "", 1); /* Append Nul. */
+ line = get_membuf (&mb, &linelen);
+ if (!line)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ if (linelen + 2 >= ASSUAN_LINELENGTH)
+ {
+ err = gpg_error (GPG_ERR_TOO_MANY);
+ goto leave;
+ }
+
+ parm.memfp = es_fopenmem (0, "rwb");
+ if (!parm.memfp)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ err = assuan_transact (ctx, line, ks_get_data_cb, &parm,
+ NULL, NULL, ks_status_cb, &stparm);
+ if (err)
+ goto leave;
+
+ es_rewind (parm.memfp);
+ *r_fp = parm.memfp;
+ parm.memfp = NULL;
+
+
+ leave:
+ if (r_source && stparm.source)
+ {
+ *r_source = stparm.source;
+ stparm.source = NULL;
+ }
+ es_fclose (parm.memfp);
+ xfree (stparm.source);
+ xfree (line);
+ close_context (ctrl, ctx);
+ return err;
+}
+
+
+/* Run the KS_FETCH and pass URL as argument. On success an estream
+ object is returned to retrieve the keys. On error an error code is
+ returned and NULL stored at R_FP.
+
+ The url is expected to point to a small set of keys; in many cases
+ only to one key. However, schemes like finger may return several
+ keys. Note that the configured keyservers are ignored by the
+ KS_FETCH command. */
+gpg_error_t
+gpg_dirmngr_ks_fetch (ctrl_t ctrl, const char *url, estream_t *r_fp)
+{
+ gpg_error_t err;
+ assuan_context_t ctx;
+ struct ks_get_parm_s parm;
+ char *line = NULL;
+
+ memset (&parm, 0, sizeof parm);
+
+ *r_fp = NULL;
+
+ err = open_context (ctrl, &ctx);
+ if (err)
+ return err;
+
+ line = strconcat ("KS_FETCH -- ", url, NULL);
+ 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, ks_get_data_cb, &parm,
+ NULL, NULL, NULL, NULL);
+ if (err)
+ goto leave;
+
+ es_rewind (parm.memfp);
+ *r_fp = parm.memfp;
+ parm.memfp = NULL;
+
+ leave:
+ es_fclose (parm.memfp);
+ xfree (line);
+ close_context (ctrl, ctx);
+ return err;
+}
+
+
+
+static void
+record_output (estream_t output,
+ pkttype_t type,
+ const char *validity,
+ int pub_key_length, /* The public key length or -1. */
+ int pub_key_algo, /* The public key algo or -1. */
+ const u32 *keyid, /* 2 ulongs or NULL. */
+ u32 creation_date, /* The creation date or 0. */
+ u32 expiration_date, /* The expiration date or 0. */
+ const char *userid) /* The userid or NULL. */
+{
+ const char *type_str = NULL;
+
+ switch (type)
+ {
+ case PKT_PUBLIC_KEY:
+ type_str = "pub";
+ break;
+ case PKT_PUBLIC_SUBKEY:
+ type_str = "sub";
+ break;
+ case PKT_USER_ID:
+ type_str = "uid";
+ break;
+ case PKT_SIGNATURE:
+ type_str = "sig";
+ break;
+ default:
+ log_assert (! "Unhandled type.");
+ }
+ es_fprintf (output, "%s:%s:",
+ type_str,
+ validity ? validity : "");
+
+ if (pub_key_length > 0)
+ es_fprintf (output, "%d", pub_key_length);
+ es_fputc (':', output);
+
+ if (pub_key_algo != -1)
+ es_fprintf (output, "%d", pub_key_algo);
+ es_fputc (':', output);
+
+ if (keyid)
+ es_fprintf (output, "%08lX%08lX", (ulong) keyid[0], (ulong) keyid[1]);
+
+ es_fprintf (output, ":%s:", colon_strtime (creation_date));
+ es_fprintf (output, "%s:::", colon_strtime (expiration_date));
+
+ if (userid)
+ es_write_sanitized (output, userid, strlen (userid), ":", NULL);
+ else
+ es_fputc (':', output);
+ es_fputs (":::::::::\n", output);
+
+}
+
+
+/* Handle the KS_PUT inquiries. */
+static gpg_error_t
+ks_put_inq_cb (void *opaque, const char *line)
+{
+ struct ks_put_parm_s *parm = opaque;
+ gpg_error_t err = 0;
+
+ if (has_leading_keyword (line, "KEYBLOCK"))
+ {
+ if (parm->data)
+ err = assuan_send_data (parm->ctx, parm->data, parm->datalen);
+ }
+ else if (has_leading_keyword (line, "KEYBLOCK_INFO"))
+ {
+ kbnode_t node;
+ estream_t fp;
+ char hexfpr[2*MAX_FINGERPRINT_LEN+1];
+
+ /* Parse the keyblock and send info lines back to the server. */
+ fp = es_fopenmem (0, "rw,samethread");
+ if (!fp)
+ err = gpg_error_from_syserror ();
+
+ /* Note: the output format for the INFO block follows the colon
+ format as described in doc/DETAILS. We don't actually reuse
+ the functionality from g10/keylist.c to produce the output,
+ because we don't need all of it and some of it is quite
+ expensive to generate.
+
+ The fields are (the starred fields are the ones we need):
+
+ * Field 1 - Type of record
+ * Field 2 - Validity
+ * Field 3 - Key length
+ * Field 4 - Public key algorithm
+ * Field 5 - KeyID
+ * Field 6 - Creation date
+ * Field 7 - Expiration date
+ Field 8 - Certificate S/N, UID hash, trust signature info
+ Field 9 - Ownertrust
+ * Field 10 - User-ID
+ Field 11 - Signature class
+ Field 12 - Key capabilities
+ Field 13 - Issuer certificate fingerprint or other info
+ Field 14 - Flag field
+ Field 15 - S/N of a token
+ Field 16 - Hash algorithm
+ Field 17 - Curve name
+ */
+ for (node = parm->keyblock; !err && node; node=node->next)
+ {
+ switch (node->pkt->pkttype)
+ {
+ case PKT_PUBLIC_KEY:
+ case PKT_PUBLIC_SUBKEY:
+ {
+ PKT_public_key *pk = node->pkt->pkt.public_key;
+
+ char validity[3];
+ int i;
+
+ i = 0;
+ if (pk->flags.revoked)
+ validity[i ++] = 'r';
+ if (pk->has_expired)
+ validity[i ++] = 'e';
+ validity[i] = '\0';
+
+ keyid_from_pk (pk, NULL);
+
+ record_output (fp, node->pkt->pkttype, validity,
+ nbits_from_pk (pk), pk->pubkey_algo,
+ pk->keyid, pk->timestamp, pk->expiredate,
+ NULL);
+ es_fprintf (fp, "fpr:::::::::%s:\n",
+ hexfingerprint (pk, hexfpr, sizeof hexfpr));
+ }
+ break;
+
+ case PKT_USER_ID:
+ {
+ PKT_user_id *uid = node->pkt->pkt.user_id;
+
+ if (!uid->attrib_data)
+ {
+ char validity[3];
+ int i;
+
+ i = 0;
+ if (uid->flags.revoked)
+ validity[i ++] = 'r';
+ if (uid->flags.expired)
+ validity[i ++] = 'e';
+ validity[i] = '\0';
+
+ record_output (fp, node->pkt->pkttype, validity,
+ -1, -1, NULL,
+ uid->created, uid->expiredate,
+ uid->name);
+ }
+ }
+ break;
+
+ default:
+ continue;
+ }
+ /* Given that the last operation was an es_fprintf we should
+ get the correct ERRNO if ferror indicates an error. */
+ if (es_ferror (fp))
+ err = gpg_error_from_syserror ();
+ }
+
+ /* Without an error and if we have an keyblock at all, send the
+ data back. */
+ if (!err && parm->keyblock)
+ {
+ int rc;
+ char buffer[512];
+ size_t nread;
+
+ es_rewind (fp);
+ while (!(rc=es_read (fp, buffer, sizeof buffer, &nread)) && nread)
+ {
+ err = assuan_send_data (parm->ctx, buffer, nread);
+ if (err)
+ break;
+ }
+ if (!err && rc)
+ err = gpg_error_from_syserror ();
+ }
+ es_fclose (fp);
+ }
+ else
+ return gpg_error (GPG_ERR_ASS_UNKNOWN_INQUIRE);
+
+ return err;
+}
+
+
+/* Send a key to the configured server. {DATA,DATLEN} contains the
+ key in OpenPGP binary transport format. If KEYBLOCK is not NULL it
+ has the internal representaion of that key; this is for example
+ used to convey meta data to LDAP keyservers. */
+gpg_error_t
+gpg_dirmngr_ks_put (ctrl_t ctrl, void *data, size_t datalen, kbnode_t keyblock)
+{
+ gpg_error_t err;
+ assuan_context_t ctx;
+ struct ks_put_parm_s parm;
+
+ memset (&parm, 0, sizeof parm);
+
+ /* We are going to parse the keyblock, thus we better make sure the
+ all information is readily available. */
+ if (keyblock)
+ merge_keys_and_selfsig (ctrl, keyblock);
+
+ err = open_context (ctrl, &ctx);
+ if (err)
+ return err;
+
+ parm.ctx = ctx;
+ parm.keyblock = keyblock;
+ parm.data = data;
+ parm.datalen = datalen;
+
+ err = assuan_transact (ctx, "KS_PUT", NULL, NULL,
+ ks_put_inq_cb, &parm, NULL, NULL);
+
+ close_context (ctrl, ctx);
+ return err;
+}
+
+
+
+/* Data callback for the DNS_CERT and WKD_GET commands. */
+static gpg_error_t
+dns_cert_data_cb (void *opaque, const void *data, size_t datalen)
+{
+ struct dns_cert_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 DNS_CERT command. */
+static gpg_error_t
+dns_cert_status_cb (void *opaque, const char *line)
+{
+ struct dns_cert_parm_s *parm = opaque;
+ gpg_error_t err = 0;
+ const char *s;
+ size_t nbytes;
+
+ if ((s = has_leading_keyword (line, "FPR")))
+ {
+ char *buf;
+
+ if (!(buf = xtrystrdup (s)))
+ err = gpg_error_from_syserror ();
+ else if (parm->fpr)
+ err = gpg_error (GPG_ERR_DUP_KEY);
+ else if (!hex2str (buf, buf, strlen (buf)+1, &nbytes))
+ err = gpg_error_from_syserror ();
+ else if (nbytes < 20)
+ err = gpg_error (GPG_ERR_TOO_SHORT);
+ else
+ {
+ parm->fpr = xtrymalloc (nbytes);
+ if (!parm->fpr)
+ err = gpg_error_from_syserror ();
+ else
+ memcpy (parm->fpr, buf, (parm->fprlen = nbytes));
+ }
+ xfree (buf);
+ }
+ else if ((s = has_leading_keyword (line, "URL")) && *s)
+ {
+ if (parm->url)
+ err = gpg_error (GPG_ERR_DUP_KEY);
+ else if (!(parm->url = xtrystrdup (s)))
+ err = gpg_error_from_syserror ();
+ }
+
+ return err;
+}
+
+/* Ask the dirmngr for a DNS CERT record. Depending on the found
+ subtypes different return values are set:
+
+ - For a PGP subtype a new estream with that key will be returned at
+ R_KEY and the other return parameters are set to NULL/0.
+
+ - For an IPGP subtype the fingerprint is stored as a malloced block
+ at (R_FPR,R_FPRLEN). If an URL is available it is stored as a
+ malloced string at R_URL; NULL is stored if there is no URL.
+
+ If CERTTYPE is DNS_CERTTYPE_ANY this function returns the first
+ CERT record found with a supported type; it is expected that only
+ one CERT record is used. If CERTTYPE is one of the supported
+ certtypes, only records with this certtype are considered and the
+ first one found is returned. All R_* args are optional.
+
+ If CERTTYPE is NULL the DANE method is used to fetch the key.
+ */
+gpg_error_t
+gpg_dirmngr_dns_cert (ctrl_t ctrl, const char *name, const char *certtype,
+ estream_t *r_key,
+ unsigned char **r_fpr, size_t *r_fprlen,
+ char **r_url)
+{
+ gpg_error_t err;
+ assuan_context_t ctx;
+ struct dns_cert_parm_s parm;
+ char *line = NULL;
+
+ memset (&parm, 0, sizeof parm);
+ if (r_key)
+ *r_key = NULL;
+ if (r_fpr)
+ *r_fpr = NULL;
+ if (r_fprlen)
+ *r_fprlen = 0;
+ if (r_url)
+ *r_url = NULL;
+
+ err = open_context (ctrl, &ctx);
+ if (err)
+ return err;
+
+ line = es_bsprintf ("DNS_CERT %s %s", certtype? certtype : "--dane", name);
+ 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, dns_cert_data_cb, &parm,
+ NULL, NULL, dns_cert_status_cb, &parm);
+ if (err)
+ goto leave;
+
+ if (r_key)
+ {
+ es_rewind (parm.memfp);
+ *r_key = parm.memfp;
+ parm.memfp = NULL;
+ }
+
+ if (r_fpr && parm.fpr)
+ {
+ *r_fpr = parm.fpr;
+ parm.fpr = NULL;
+ }
+ if (r_fprlen)
+ *r_fprlen = parm.fprlen;
+
+ if (r_url && parm.url)
+ {
+ *r_url = parm.url;
+ parm.url = NULL;
+ }
+
+ leave:
+ xfree (parm.fpr);
+ xfree (parm.url);
+ es_fclose (parm.memfp);
+ xfree (line);
+ close_context (ctrl, ctx);
+ return err;
+}
+
+
+/* Ask the dirmngr for PKA info. On success the retrieved fingerprint
+ is returned in a malloced buffer at R_FPR and its length is stored
+ at R_FPRLEN. If an URL is available it is stored as a malloced
+ string at R_URL. On error all return values are set to NULL/0. */
+gpg_error_t
+gpg_dirmngr_get_pka (ctrl_t ctrl, const char *userid,
+ unsigned char **r_fpr, size_t *r_fprlen,
+ char **r_url)
+{
+ gpg_error_t err;
+ assuan_context_t ctx;
+ struct dns_cert_parm_s parm;
+ char *line = NULL;
+
+ memset (&parm, 0, sizeof parm);
+ if (r_fpr)
+ *r_fpr = NULL;
+ if (r_fprlen)
+ *r_fprlen = 0;
+ if (r_url)
+ *r_url = NULL;
+
+ err = open_context (ctrl, &ctx);
+ if (err)
+ return err;
+
+ line = es_bsprintf ("DNS_CERT --pka -- %s", userid);
+ if (!line)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ if (strlen (line) + 2 >= ASSUAN_LINELENGTH)
+ {
+ err = gpg_error (GPG_ERR_TOO_LARGE);
+ goto leave;
+ }
+
+ err = assuan_transact (ctx, line, dns_cert_data_cb, &parm,
+ NULL, NULL, dns_cert_status_cb, &parm);
+ if (err)
+ goto leave;
+
+ if (r_fpr && parm.fpr)
+ {
+ *r_fpr = parm.fpr;
+ parm.fpr = NULL;
+ }
+ if (r_fprlen)
+ *r_fprlen = parm.fprlen;
+
+ if (r_url && parm.url)
+ {
+ *r_url = parm.url;
+ parm.url = NULL;
+ }
+
+ leave:
+ xfree (parm.fpr);
+ xfree (parm.url);
+ xfree (line);
+ close_context (ctrl, ctx);
+ return err;
+}
+
+
+
+/* Ask the dirmngr to retrieve a key via the Web Key Directory
+ * protocol. If QUICK is set the dirmngr is advised to use a shorter
+ * timeout. On success a new estream with the key stored at R_KEY and the
+ * url of the lookup (if any) stored at R_URL. Note that
+ */
+gpg_error_t
+gpg_dirmngr_wkd_get (ctrl_t ctrl, const char *name, int quick,
+ estream_t *r_key, char **r_url)
+{
+ gpg_error_t err;
+ assuan_context_t ctx;
+ struct ks_status_parm_s stparm = { NULL };
+ struct dns_cert_parm_s parm = { NULL };
+ char *line = NULL;
+
+ if (r_key)
+ *r_key = NULL;
+
+ if (r_url)
+ *r_url = NULL;
+
+ err = open_context (ctrl, &ctx);
+ if (err)
+ return err;
+
+ line = es_bsprintf ("WKD_GET%s -- %s", quick?" --quick":"", name);
+ 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 (MAX_WKD_RESULT_LENGTH, "rwb");
+ if (!parm.memfp)
+ {
+ err = gpg_error_from_syserror ();
+ goto leave;
+ }
+ err = assuan_transact (ctx, line, dns_cert_data_cb, &parm,
+ NULL, NULL, ks_status_cb, &stparm);
+ if (gpg_err_code (err) == GPG_ERR_ENOSPC)
+ err = gpg_error (GPG_ERR_TOO_LARGE);
+ if (err)
+ goto leave;
+
+ if (r_key)
+ {
+ es_rewind (parm.memfp);
+ *r_key = parm.memfp;
+ parm.memfp = NULL;
+ }
+
+ if (r_url)
+ {
+ *r_url = stparm.source;
+ stparm.source = NULL;
+ }
+
+ leave:
+ xfree (stparm.source);
+ xfree (parm.fpr);
+ xfree (parm.url);
+ es_fclose (parm.memfp);
+ xfree (line);
+ close_context (ctrl, ctx);
+ return err;
+}