src/plugins/pgpcore/pgp_viewer.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2012 the Claws Mail team
   4  * This file Copyright (C) 2006 Colin Leroy <colin@colino.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #  include "config.h"
  23 #include "claws-features.h"
  24 #endif
  25
  26 #include <stddef.h>
  27 #include <glib.h>
  28 #include <glib/gi18n.h>
  29 #include <sys/types.h>
  30 #ifndef G_OS_WIN32
  31 #  include <sys/wait.h>
  32 #else
  33 #  include <pthread.h>
  34 #  include <windows.h>
  35 #endif
  36 #if (defined(__DragonFly__) || defined(SOLARIS) || defined (__NetBSD__) || defined (__FreeBSD__) || defined (__OpenBSD__))
  37 #  include <sys/signal.h>
  38 #endif
  39
  40 #include "version.h"
  41 #include "common/claws.h"
  42 #include "mainwindow.h"
  43 #include "mimeview.h"
  44 #include "textview.h"
  45 #include "sgpgme.h"
  46 #include "prefs_common.h"
  47 #include "prefs_gpg.h"
  48 #include "alertpanel.h"
  49 #include "plugin.h"
  50
  51 typedef struct _PgpViewer PgpViewer;
  52
  53 static MimeViewerFactory pgp_viewer_factory;
  54
  55 struct _PgpViewer
  56 {
  57         MimeViewer       mimeviewer;
  58         TextView        *textview;
  59 };
  60
  61 static gchar *content_types[] =
  62         {"application/pgp-signature", NULL};
  63
  64 static GtkWidget *pgp_get_widget(MimeViewer *_viewer)
  65 {
  66         PgpViewer *viewer = (PgpViewer *) _viewer;
  67
  68         debug_print("pgp_get_widget\n");
  69
  70         return GTK_WIDGET(viewer->textview->vbox);
  71 }
  72
  73 static gchar *_get_gpg_executable_name()
  74 {
  75         gpgme_engine_info_t e;
  76
  77         if (!gpgme_get_engine_info(&e)) {
  78                 while (e != NULL) {
  79                         if (e->protocol == GPGME_PROTOCOL_OpenPGP
  80                                         && e->file_name != NULL) {
  81                                 debug_print("Found gpg executable: '%s'\n", e->file_name);
  82                                 return e->file_name;
  83                         }
  84                 }
  85         }
  86
  87         return NULL;
  88 }
  89
  90 #ifdef G_OS_WIN32
  91 struct _ImportCtx {
  92         gboolean done;
  93         gchar *cmd;
  94         DWORD exitcode;
  95 };
  96
  97 static void *_import_threaded(void *arg)
  98 {
  99         struct _ImportCtx *ctx = (struct _ImportCtx *)arg;
 100         gboolean result;
 101
 102         PROCESS_INFORMATION pi = {0};
 103         STARTUPINFO si = {0};
 104
 105         result = CreateProcess(NULL, ctx->cmd, NULL, NULL, FALSE,
 106                         NORMAL_PRIORITY_CLASS | CREATE_NO_WINDOW,
 107                         NULL, NULL, &si, &pi);
 108
 109         if (!result) {
 110                 debug_print("Couldn't execute '%s'\n", ctx->cmd);
 111         } else {
 112                 WaitForSingleObject(pi.hProcess, 10000);
 113                 result = GetExitCodeProcess(pi.hProcess, &ctx->exitcode);
 114                 if (ctx->exitcode == STILL_ACTIVE) {
 115                         debug_print("Process still running, terminating it.\n");
 116                         TerminateProcess(pi.hProcess, 255);
 117                 }
 118
 119                 CloseHandle(pi.hProcess);
 120                 CloseHandle(pi.hThread);
 121
 122                 if (!result) {
 123                         debug_print("Process executed, but we couldn't get its exit code (huh?)\n");
 124                 }
 125         }
 126
 127         ctx->done = TRUE;
 128         return NULL;
 129 }
 130 #endif
 131
 132 static void pgpview_show_mime_part(TextView *textview, MimeInfo *partinfo)
 133 {
 134         GtkTextView *text;
 135         GtkTextBuffer *buffer;
 136         GtkTextIter iter;
 137         gpgme_data_t sigdata = NULL;
 138         gpgme_verify_result_t sigstatus = NULL;
 139         gpgme_ctx_t ctx = NULL;
 140         gpgme_key_t key = NULL;
 141         gpgme_signature_t sig = NULL;
 142         gpgme_error_t err = 0;
 143         gboolean imported = FALSE;
 144
 145         if (!partinfo) return;
 146
 147         textview_set_font(textview, NULL);
 148         textview_clear(textview);
 149
 150         text = GTK_TEXT_VIEW(textview->text);
 151         buffer = gtk_text_view_get_buffer(text);
 152         gtk_text_buffer_get_start_iter(buffer, &iter);
 153
 154         err = gpgme_new (&ctx);
 155         if (err) {
 156                 debug_print("err : %s\n", gpgme_strerror(err));
 157                 textview_show_mime_part(textview, partinfo);
 158                 return;
 159         }
 160
 161         sigdata = sgpgme_data_from_mimeinfo(partinfo);
 162         if (!sigdata) {
 163                 g_warning("no sigdata");
 164                 textview_show_mime_part(textview, partinfo);
 165                 return;
 166         }
 167
 168         /* Here we do not care about what data we attempt to verify with the
 169          * signature, or about result of the verification - all we care about
 170          * is that we find out ID of the key used to make this signature. */
 171         sigstatus = sgpgme_verify_signature(ctx, sigdata, NULL, sigdata);
 172         if (!sigstatus || sigstatus == GINT_TO_POINTER(-GPG_ERR_SYSTEM_ERROR)) {
 173                 g_warning("no sigstatus");
 174                 textview_show_mime_part(textview, partinfo);
 175                 return;
 176         }
 177         sig = sigstatus->signatures;
 178         if (!sig) {
 179                 g_warning("no sig");
 180                 textview_show_mime_part(textview, partinfo);
 181                 return;
 182         }
 183         gpgme_get_key(ctx, sig->fpr, &key, 0);
 184         if (!key) {
 185                 gchar *gpgbin = _get_gpg_executable_name();
 186                 gchar *cmd = g_strdup_printf("\"%s\" --no-tty --recv-keys %s",
 187                                 (gpgbin ? gpgbin : "gpg"), sig->fpr);
 188                 AlertValue val = G_ALERTDEFAULT;
 189                 if (!prefs_common_get_prefs()->work_offline) {
 190                         val = alertpanel(_("Key import"),
 191                                 _("This key is not in your keyring. Do you want "
 192                                   "Claws Mail to try and import it from a "
 193                                   "keyserver?"),
 194                                   GTK_STOCK_NO, "+" GTK_STOCK_YES, NULL);
 195                         GTK_EVENTS_FLUSH();
 196                 }
 197                 if (val == G_ALERTDEFAULT) {
 198                         TEXTVIEW_INSERT(_("\n  Key ID "));
 199                         TEXTVIEW_INSERT(sig->fpr);
 200                         TEXTVIEW_INSERT(":\n\n");
 201                         TEXTVIEW_INSERT(_("   This key is not in your keyring.\n"));
 202                         TEXTVIEW_INSERT(_("   It should be possible to import it "));
 203                         if (prefs_common_get_prefs()->work_offline)
 204                                 TEXTVIEW_INSERT(_("when working online,\n   or "));
 205                         TEXTVIEW_INSERT(_("with the following command: \n\n     "));
 206                         TEXTVIEW_INSERT(cmd);
 207                 } else {
 208                         TEXTVIEW_INSERT(_("\n  Importing key ID "));
 209                         TEXTVIEW_INSERT(sig->fpr);
 210                         TEXTVIEW_INSERT(":\n\n");
 211
 212                         main_window_cursor_wait(mainwindow_get_mainwindow());
 213                         textview_cursor_wait(textview);
 214                         GTK_EVENTS_FLUSH();
 215
 216 #ifndef G_OS_WIN32
 217                         int res = 0;
 218                         pid_t pid = 0;
 219
 220                         pid = fork();
 221                         if (pid == -1) {
 222                                 res = -1;
 223                         } else if (pid == 0) {
 224                                 /* son */
 225                                 gchar **argv;
 226                                 argv = strsplit_with_quote(cmd, " ", 0);
 227                                 res = execvp(argv[0], argv);
 228                                 exit(255);
 229                         } else {
 230                                 int status = 0;
 231                                 time_t start_wait = time(NULL);
 232                                 res = -1;
 233                                 do {
 234                                         if (waitpid(pid, &status, WNOHANG) == 0 || !WIFEXITED(status)) {
 235                                                 usleep(200000);
 236                                         } else {
 237                                                 res = WEXITSTATUS(status);
 238                                                 break;
 239                                         }
 240                                         if (time(NULL) - start_wait > 9) {
 241                                                 debug_print("SIGTERM'ing gpg %d\n", pid);
 242                                                 kill(pid, SIGTERM);
 243                                         }
 244                                         if (time(NULL) - start_wait > 10) {
 245                                                 debug_print("SIGKILL'ing gpg %d\n", pid);
 246                                                 kill(pid, SIGKILL);
 247                                                 break;
 248                                         }
 249                                 } while(1);
 250                         }
 251                         debug_print("res %d\n", res);
 252                         if (res == 0)
 253                                 imported = TRUE;
 254 #else
 255                         /* We need to call gpg in a separate thread, so that waiting for
 256                          * it to finish does not block the UI. */
 257                         pthread_t pt;
 258                         struct _ImportCtx *ctx = malloc(sizeof(struct _ImportCtx));
 259
 260                         ctx->done = FALSE;
 261                         ctx->exitcode = STILL_ACTIVE;
 262                         ctx->cmd = cmd;
 263
 264                         if (pthread_create(&pt, PTHREAD_CREATE_JOINABLE,
 265                                                 _import_threaded, (void *)ctx) != 0) {
 266                                 debug_print("Couldn't create thread, continuing unthreaded.\n");
 267                                 _import_threaded(ctx);
 268                         } else {
 269                                 debug_print("Thread created, waiting for it to finish...\n");
 270                                 while (!ctx->done)
 271                                         claws_do_idle();
 272                         }
 273
 274                         debug_print("Thread finished.\n");
 275                         pthread_join(pt, NULL);
 276
 277                         if (ctx->exitcode == 0) {
 278                                 imported = TRUE;
 279                         }
 280                         g_free(ctx);
 281 #endif
 282                         main_window_cursor_normal(mainwindow_get_mainwindow());
 283                         textview_cursor_normal(textview);
 284                         if (imported) {
 285                                 TEXTVIEW_INSERT(_("   This key has been imported to your keyring.\n"));
 286                         } else {
 287                                 TEXTVIEW_INSERT(_("   This key couldn't be imported to your keyring.\n"));
 288                                 TEXTVIEW_INSERT(_("   Key servers are sometimes slow.\n"));
 289                                 TEXTVIEW_INSERT(_("   You can try to import it manually with the command:\n\n     "));
 290                                 TEXTVIEW_INSERT(cmd);
 291                         }
 292                 }
 293                 g_free(cmd);
 294                 return;
 295         } else {
 296                 TEXTVIEW_INSERT(_("\n  Key ID "));
 297                 TEXTVIEW_INSERT(sig->fpr);
 298                 TEXTVIEW_INSERT(":\n\n");
 299                 TEXTVIEW_INSERT(_("   This key is in your keyring.\n"));
 300         }
 301         gpgme_data_release(sigdata);
 302         gpgme_release(ctx);
 303         textview_show_icon(textview, GTK_STOCK_DIALOG_AUTHENTICATION);
 304 }
 305
 306
 307 static void pgp_show_mimepart(MimeViewer *_viewer,
 308                                 const gchar *infile,
 309                                 MimeInfo *partinfo)
 310 {
 311         PgpViewer *viewer = (PgpViewer *)_viewer;
 312         debug_print("pgp_show_mimepart\n");
 313         viewer->textview->messageview = _viewer->mimeview->messageview;
 314         pgpview_show_mime_part(viewer->textview, partinfo);
 315 }
 316
 317 static void pgp_clear_viewer(MimeViewer *_viewer)
 318 {
 319         PgpViewer *viewer = (PgpViewer *)_viewer;
 320         debug_print("pgp_clear_viewer\n");
 321         textview_clear(viewer->textview);
 322 }
 323
 324 static void pgp_destroy_viewer(MimeViewer *_viewer)
 325 {
 326         PgpViewer *viewer = (PgpViewer *)_viewer;
 327         debug_print("pgp_destroy_viewer\n");
 328         textview_destroy(viewer->textview);
 329 }
 330
 331 static MimeViewer *pgp_viewer_create(void)
 332 {
 333         PgpViewer *viewer;
 334
 335         debug_print("pgp_viewer_create\n");
 336
 337         viewer = g_new0(PgpViewer, 1);
 338         viewer->mimeviewer.factory = &pgp_viewer_factory;
 339         viewer->mimeviewer.get_widget = pgp_get_widget;
 340         viewer->mimeviewer.show_mimepart = pgp_show_mimepart;
 341         viewer->mimeviewer.clear_viewer = pgp_clear_viewer;
 342         viewer->mimeviewer.destroy_viewer = pgp_destroy_viewer;
 343         viewer->mimeviewer.get_selection = NULL;
 344         viewer->textview = textview_create();
 345         textview_init(viewer->textview);
 346
 347         gtk_widget_show_all(viewer->textview->vbox);
 348
 349         return (MimeViewer *) viewer;
 350 }
 351
 352 static MimeViewerFactory pgp_viewer_factory =
 353 {
 354         content_types,
 355         0,
 356
 357         pgp_viewer_create,
 358 };
 359
 360 void pgp_viewer_init(void)
 361 {
 362         mimeview_register_viewer_factory(&pgp_viewer_factory);
 363 }
 364
 365 void pgp_viewer_done(void)
 366 {
 367         mimeview_unregister_viewer_factory(&pgp_viewer_factory);
 368
 369 }