mirror of git://git.gnupg.org/gnupg.git
702 lines
17 KiB
C
702 lines
17 KiB
C
/* wks-utils.c - Common helper functions for wks tools
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* Copyright (C) 2016 g10 Code GmbH
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* Copyright (C) 2016 Bundesamt für Sicherheit in der Informationstechnik
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*
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* This file is part of GnuPG.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "../common/util.h"
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#include "../common/status.h"
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#include "../common/ccparray.h"
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#include "../common/exectool.h"
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#include "../common/mbox-util.h"
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#include "mime-maker.h"
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#include "send-mail.h"
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#include "gpg-wks.h"
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/* The stream to output the status information. Output is disabled if
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this is NULL. */
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static estream_t statusfp;
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/* Set the status FD. */
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void
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wks_set_status_fd (int fd)
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{
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static int last_fd = -1;
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if (fd != -1 && last_fd == fd)
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return;
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if (statusfp && statusfp != es_stdout && statusfp != es_stderr)
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es_fclose (statusfp);
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statusfp = NULL;
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if (fd == -1)
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return;
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if (fd == 1)
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statusfp = es_stdout;
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else if (fd == 2)
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statusfp = es_stderr;
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else
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statusfp = es_fdopen (fd, "w");
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if (!statusfp)
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{
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log_fatal ("can't open fd %d for status output: %s\n",
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fd, gpg_strerror (gpg_error_from_syserror ()));
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}
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last_fd = fd;
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}
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/* Write a status line with code NO followed by the output of the
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* printf style FORMAT. The caller needs to make sure that LFs and
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* CRs are not printed. */
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void
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wks_write_status (int no, const char *format, ...)
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{
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va_list arg_ptr;
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if (!statusfp)
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return; /* Not enabled. */
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es_fputs ("[GNUPG:] ", statusfp);
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es_fputs (get_status_string (no), statusfp);
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if (format)
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{
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es_putc (' ', statusfp);
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va_start (arg_ptr, format);
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es_vfprintf (statusfp, format, arg_ptr);
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va_end (arg_ptr);
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}
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es_putc ('\n', statusfp);
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}
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/* Append UID to LIST and return the new item. On success LIST is
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* updated. On error ERRNO is set and NULL returned. */
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static uidinfo_list_t
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append_to_uidinfo_list (uidinfo_list_t *list, const char *uid, time_t created)
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{
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uidinfo_list_t r, sl;
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sl = xtrymalloc (sizeof *sl + strlen (uid));
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if (!sl)
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return NULL;
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strcpy (sl->uid, uid);
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sl->created = created;
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sl->mbox = mailbox_from_userid (uid);
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sl->next = NULL;
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if (!*list)
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*list = sl;
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else
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{
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for (r = *list; r->next; r = r->next )
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;
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r->next = sl;
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}
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return sl;
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}
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/* Free the list of uid infos at LIST. */
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void
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free_uidinfo_list (uidinfo_list_t list)
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{
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while (list)
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{
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uidinfo_list_t tmp = list->next;
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xfree (list->mbox);
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xfree (list);
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list = tmp;
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}
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}
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struct get_key_status_parm_s
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{
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const char *fpr;
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int found;
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int count;
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};
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static void
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get_key_status_cb (void *opaque, const char *keyword, char *args)
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{
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struct get_key_status_parm_s *parm = opaque;
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/*log_debug ("%s: %s\n", keyword, args);*/
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if (!strcmp (keyword, "EXPORTED"))
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{
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parm->count++;
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if (!ascii_strcasecmp (args, parm->fpr))
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parm->found = 1;
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}
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}
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/* Get a key by fingerprint from gpg's keyring and make sure that the
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* mail address ADDRSPEC is included in the key. If EXACT is set the
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* returned user id must match Addrspec exactly and not just in the
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* addr-spec (mailbox) part. The key is returned as a new memory
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* stream at R_KEY. */
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gpg_error_t
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wks_get_key (estream_t *r_key, const char *fingerprint, const char *addrspec,
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int exact)
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{
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gpg_error_t err;
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ccparray_t ccp;
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const char **argv = NULL;
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estream_t key = NULL;
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struct get_key_status_parm_s parm;
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char *filterexp = NULL;
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memset (&parm, 0, sizeof parm);
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*r_key = NULL;
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key = es_fopenmem (0, "w+b");
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if (!key)
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{
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err = gpg_error_from_syserror ();
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log_error ("error allocating memory buffer: %s\n", gpg_strerror (err));
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goto leave;
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}
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/* Prefix the key with the MIME content type. */
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es_fputs ("Content-Type: application/pgp-keys\n"
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"\n", key);
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filterexp = es_bsprintf ("keep-uid=%s=%s", exact? "uid":"mbox", addrspec);
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if (!filterexp)
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{
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err = gpg_error_from_syserror ();
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log_error ("error allocating memory buffer: %s\n", gpg_strerror (err));
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goto leave;
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}
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ccparray_init (&ccp, 0);
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ccparray_put (&ccp, "--no-options");
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if (!opt.verbose)
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ccparray_put (&ccp, "--quiet");
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else if (opt.verbose > 1)
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ccparray_put (&ccp, "--verbose");
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ccparray_put (&ccp, "--batch");
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ccparray_put (&ccp, "--status-fd=2");
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ccparray_put (&ccp, "--always-trust");
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ccparray_put (&ccp, "--armor");
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ccparray_put (&ccp, "--export-options=export-minimal");
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ccparray_put (&ccp, "--export-filter");
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ccparray_put (&ccp, filterexp);
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ccparray_put (&ccp, "--export");
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ccparray_put (&ccp, "--");
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ccparray_put (&ccp, fingerprint);
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ccparray_put (&ccp, NULL);
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argv = ccparray_get (&ccp, NULL);
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if (!argv)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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parm.fpr = fingerprint;
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err = gnupg_exec_tool_stream (opt.gpg_program, argv, NULL,
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NULL, key,
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get_key_status_cb, &parm);
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if (!err && parm.count > 1)
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err = gpg_error (GPG_ERR_TOO_MANY);
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else if (!err && !parm.found)
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err = gpg_error (GPG_ERR_NOT_FOUND);
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if (err)
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{
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log_error ("export failed: %s\n", gpg_strerror (err));
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goto leave;
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}
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es_rewind (key);
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*r_key = key;
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key = NULL;
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leave:
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es_fclose (key);
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xfree (argv);
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xfree (filterexp);
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return err;
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}
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/* Helper for wks_list_key and wks_filter_uid. */
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static void
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key_status_cb (void *opaque, const char *keyword, char *args)
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{
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(void)opaque;
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if (DBG_CRYPTO)
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log_debug ("gpg status: %s %s\n", keyword, args);
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}
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/* Run gpg on KEY and store the primary fingerprint at R_FPR and the
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* list of mailboxes at R_MBOXES. Returns 0 on success; on error NULL
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* is stored at R_FPR and R_MBOXES and an error code is returned.
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* R_FPR may be NULL if the fingerprint is not needed. */
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gpg_error_t
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wks_list_key (estream_t key, char **r_fpr, uidinfo_list_t *r_mboxes)
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{
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gpg_error_t err;
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ccparray_t ccp;
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const char **argv;
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estream_t listing;
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char *line = NULL;
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size_t length_of_line = 0;
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size_t maxlen;
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ssize_t len;
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char **fields = NULL;
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int nfields;
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int lnr;
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char *fpr = NULL;
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uidinfo_list_t mboxes = NULL;
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if (r_fpr)
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*r_fpr = NULL;
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*r_mboxes = NULL;
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/* Open a memory stream. */
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listing = es_fopenmem (0, "w+b");
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if (!listing)
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{
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err = gpg_error_from_syserror ();
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log_error ("error allocating memory buffer: %s\n", gpg_strerror (err));
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return err;
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}
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ccparray_init (&ccp, 0);
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ccparray_put (&ccp, "--no-options");
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if (!opt.verbose)
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ccparray_put (&ccp, "--quiet");
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else if (opt.verbose > 1)
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ccparray_put (&ccp, "--verbose");
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ccparray_put (&ccp, "--batch");
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ccparray_put (&ccp, "--status-fd=2");
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ccparray_put (&ccp, "--always-trust");
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ccparray_put (&ccp, "--with-colons");
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ccparray_put (&ccp, "--dry-run");
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ccparray_put (&ccp, "--import-options=import-minimal,import-show");
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ccparray_put (&ccp, "--import");
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ccparray_put (&ccp, NULL);
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argv = ccparray_get (&ccp, NULL);
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if (!argv)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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err = gnupg_exec_tool_stream (opt.gpg_program, argv, key,
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NULL, listing,
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key_status_cb, NULL);
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if (err)
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{
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log_error ("import failed: %s\n", gpg_strerror (err));
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goto leave;
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}
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es_rewind (listing);
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lnr = 0;
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maxlen = 2048; /* Set limit. */
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while ((len = es_read_line (listing, &line, &length_of_line, &maxlen)) > 0)
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{
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lnr++;
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if (!maxlen)
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{
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log_error ("received line too long\n");
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err = gpg_error (GPG_ERR_LINE_TOO_LONG);
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goto leave;
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}
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/* Strip newline and carriage return, if present. */
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while (len > 0
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&& (line[len - 1] == '\n' || line[len - 1] == '\r'))
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line[--len] = '\0';
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/* log_debug ("line '%s'\n", line); */
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xfree (fields);
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fields = strtokenize (line, ":");
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if (!fields)
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{
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err = gpg_error_from_syserror ();
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log_error ("strtokenize failed: %s\n", gpg_strerror (err));
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goto leave;
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}
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for (nfields = 0; fields[nfields]; nfields++)
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;
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if (!nfields)
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{
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err = gpg_error (GPG_ERR_INV_ENGINE);
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goto leave;
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}
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if (!strcmp (fields[0], "sec"))
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{
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/* gpg may return "sec" as the first record - but we do not
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* accept secret keys. */
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err = gpg_error (GPG_ERR_NO_PUBKEY);
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goto leave;
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}
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if (lnr == 1 && strcmp (fields[0], "pub"))
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{
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/* First record is not a public key. */
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err = gpg_error (GPG_ERR_INV_ENGINE);
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goto leave;
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}
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if (lnr > 1 && !strcmp (fields[0], "pub"))
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{
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/* More than one public key. */
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err = gpg_error (GPG_ERR_TOO_MANY);
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goto leave;
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}
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if (!strcmp (fields[0], "sub") || !strcmp (fields[0], "ssb"))
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break; /* We can stop parsing here. */
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if (!strcmp (fields[0], "fpr") && nfields > 9 && !fpr)
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{
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fpr = xtrystrdup (fields[9]);
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if (!fpr)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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}
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else if (!strcmp (fields[0], "uid") && nfields > 9)
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{
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/* Fixme: Unescape fields[9] */
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if (!append_to_uidinfo_list (&mboxes, fields[9],
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parse_timestamp (fields[5], NULL)))
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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}
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}
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if (len < 0 || es_ferror (listing))
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{
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err = gpg_error_from_syserror ();
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log_error ("error reading memory stream\n");
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goto leave;
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}
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if (!fpr)
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{
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err = gpg_error (GPG_ERR_NO_PUBKEY);
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goto leave;
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}
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if (r_fpr)
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{
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*r_fpr = fpr;
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fpr = NULL;
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}
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*r_mboxes = mboxes;
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mboxes = NULL;
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leave:
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xfree (fpr);
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free_uidinfo_list (mboxes);
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xfree (fields);
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es_free (line);
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xfree (argv);
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es_fclose (listing);
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return err;
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}
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/* Run gpg as a filter on KEY and write the output to a new stream
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* stored at R_NEWKEY. The new key will contain only the user id UID.
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* Returns 0 on success. Only one key is expected in KEY. If BINARY
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* is set the resulting key is returned as a binary (non-armored)
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* keyblock. */
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gpg_error_t
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wks_filter_uid (estream_t *r_newkey, estream_t key, const char *uid,
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int binary)
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{
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gpg_error_t err;
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ccparray_t ccp;
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const char **argv = NULL;
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estream_t newkey;
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char *filterexp = NULL;
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*r_newkey = NULL;
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/* Open a memory stream. */
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newkey = es_fopenmem (0, "w+b");
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if (!newkey)
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{
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err = gpg_error_from_syserror ();
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log_error ("error allocating memory buffer: %s\n", gpg_strerror (err));
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return err;
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}
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/* Prefix the key with the MIME content type. */
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if (!binary)
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es_fputs ("Content-Type: application/pgp-keys\n"
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"\n", newkey);
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filterexp = es_bsprintf ("keep-uid=uid=%s", uid);
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if (!filterexp)
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{
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err = gpg_error_from_syserror ();
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log_error ("error allocating memory buffer: %s\n", gpg_strerror (err));
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goto leave;
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}
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ccparray_init (&ccp, 0);
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ccparray_put (&ccp, "--no-options");
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if (!opt.verbose)
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ccparray_put (&ccp, "--quiet");
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else if (opt.verbose > 1)
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ccparray_put (&ccp, "--verbose");
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ccparray_put (&ccp, "--batch");
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ccparray_put (&ccp, "--status-fd=2");
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ccparray_put (&ccp, "--always-trust");
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if (!binary)
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ccparray_put (&ccp, "--armor");
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ccparray_put (&ccp, "--import-options=import-export");
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ccparray_put (&ccp, "--import-filter");
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ccparray_put (&ccp, filterexp);
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ccparray_put (&ccp, "--import");
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ccparray_put (&ccp, NULL);
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argv = ccparray_get (&ccp, NULL);
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if (!argv)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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err = gnupg_exec_tool_stream (opt.gpg_program, argv, key,
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NULL, newkey,
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key_status_cb, NULL);
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if (err)
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{
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log_error ("import/export failed: %s\n", gpg_strerror (err));
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goto leave;
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}
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es_rewind (newkey);
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*r_newkey = newkey;
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newkey = NULL;
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leave:
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xfree (filterexp);
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xfree (argv);
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es_fclose (newkey);
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return err;
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}
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/* Helper to write mail to the output(s). */
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gpg_error_t
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wks_send_mime (mime_maker_t mime)
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{
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gpg_error_t err;
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estream_t mail;
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/* Without any option we take a short path. */
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if (!opt.use_sendmail && !opt.output)
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{
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es_set_binary (es_stdout);
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return mime_maker_make (mime, es_stdout);
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}
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mail = es_fopenmem (0, "w+b");
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if (!mail)
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{
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err = gpg_error_from_syserror ();
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return err;
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}
|
||
|
||
err = mime_maker_make (mime, mail);
|
||
|
||
if (!err && opt.output)
|
||
{
|
||
es_rewind (mail);
|
||
err = send_mail_to_file (mail, opt.output);
|
||
}
|
||
|
||
if (!err && opt.use_sendmail)
|
||
{
|
||
es_rewind (mail);
|
||
err = send_mail (mail);
|
||
}
|
||
|
||
es_fclose (mail);
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Parse the policy flags by reading them from STREAM and storing them
|
||
* into FLAGS. If IGNORE_UNKNOWN is iset unknown keywords are
|
||
* ignored. */
|
||
gpg_error_t
|
||
wks_parse_policy (policy_flags_t flags, estream_t stream, int ignore_unknown)
|
||
{
|
||
enum tokens {
|
||
TOK_SUBMISSION_ADDRESS,
|
||
TOK_MAILBOX_ONLY,
|
||
TOK_DANE_ONLY,
|
||
TOK_AUTH_SUBMIT,
|
||
TOK_MAX_PENDING,
|
||
TOK_PROTOCOL_VERSION
|
||
};
|
||
static struct {
|
||
const char *name;
|
||
enum tokens token;
|
||
} keywords[] = {
|
||
{ "submission-address", TOK_SUBMISSION_ADDRESS },
|
||
{ "mailbox-only", TOK_MAILBOX_ONLY },
|
||
{ "dane-only", TOK_DANE_ONLY },
|
||
{ "auth-submit", TOK_AUTH_SUBMIT },
|
||
{ "max-pending", TOK_MAX_PENDING },
|
||
{ "protocol-version", TOK_PROTOCOL_VERSION }
|
||
};
|
||
gpg_error_t err = 0;
|
||
int lnr = 0;
|
||
char line[1024];
|
||
char *p, *keyword, *value;
|
||
int i, n;
|
||
|
||
memset (flags, 0, sizeof *flags);
|
||
|
||
while (es_fgets (line, DIM(line)-1, stream) )
|
||
{
|
||
lnr++;
|
||
n = strlen (line);
|
||
if (!n || line[n-1] != '\n')
|
||
{
|
||
err = gpg_error (*line? GPG_ERR_LINE_TOO_LONG
|
||
: GPG_ERR_INCOMPLETE_LINE);
|
||
break;
|
||
}
|
||
trim_trailing_spaces (line);
|
||
/* Skip empty and comment lines. */
|
||
for (p=line; spacep (p); p++)
|
||
;
|
||
if (!*p || *p == '#')
|
||
continue;
|
||
|
||
if (*p == ':')
|
||
{
|
||
err = gpg_error (GPG_ERR_SYNTAX);
|
||
break;
|
||
}
|
||
|
||
keyword = p;
|
||
value = NULL;
|
||
if ((p = strchr (p, ':')))
|
||
{
|
||
/* Colon found: Keyword with value. */
|
||
*p++ = 0;
|
||
for (; spacep (p); p++)
|
||
;
|
||
if (!*p)
|
||
{
|
||
err = gpg_error (GPG_ERR_MISSING_VALUE);
|
||
break;
|
||
}
|
||
value = p;
|
||
}
|
||
|
||
for (i=0; i < DIM (keywords); i++)
|
||
if (!ascii_strcasecmp (keywords[i].name, keyword))
|
||
break;
|
||
if (!(i < DIM (keywords)))
|
||
{
|
||
if (ignore_unknown)
|
||
continue;
|
||
err = gpg_error (GPG_ERR_INV_NAME);
|
||
break;
|
||
}
|
||
|
||
switch (keywords[i].token)
|
||
{
|
||
case TOK_SUBMISSION_ADDRESS:
|
||
if (!value || !*value)
|
||
{
|
||
err = gpg_error (GPG_ERR_SYNTAX);
|
||
goto leave;
|
||
}
|
||
xfree (flags->submission_address);
|
||
flags->submission_address = xtrystrdup (value);
|
||
if (!flags->submission_address)
|
||
{
|
||
err = gpg_error_from_syserror ();
|
||
goto leave;
|
||
}
|
||
break;
|
||
case TOK_MAILBOX_ONLY: flags->mailbox_only = 1; break;
|
||
case TOK_DANE_ONLY: flags->dane_only = 1; break;
|
||
case TOK_AUTH_SUBMIT: flags->auth_submit = 1; break;
|
||
case TOK_MAX_PENDING:
|
||
if (!value)
|
||
{
|
||
err = gpg_error (GPG_ERR_SYNTAX);
|
||
goto leave;
|
||
}
|
||
/* FIXME: Define whether these are seconds, hours, or days
|
||
* and decide whether to allow other units. */
|
||
flags->max_pending = atoi (value);
|
||
break;
|
||
case TOK_PROTOCOL_VERSION:
|
||
if (!value)
|
||
{
|
||
err = gpg_error (GPG_ERR_SYNTAX);
|
||
goto leave;
|
||
}
|
||
flags->protocol_version = atoi (value);
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (!err && !es_feof (stream))
|
||
err = gpg_error_from_syserror ();
|
||
|
||
leave:
|
||
if (err)
|
||
log_error ("error reading '%s', line %d: %s\n",
|
||
es_fname_get (stream), lnr, gpg_strerror (err));
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
void
|
||
wks_free_policy (policy_flags_t policy)
|
||
{
|
||
if (policy)
|
||
{
|
||
xfree (policy->submission_address);
|
||
memset (policy, 0, sizeof *policy);
|
||
}
|
||
}
|