src/plugins/pgpcore/pgp_viewer.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2021 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 #ifdef G_OS_WIN32
  74 struct _ImportCtx {
  75         gboolean done;
  76         gchar *cmd;
  77         DWORD exitcode;
  78 };
  79
  80 static void *_import_threaded(void *arg)
  81 {
  82         struct _ImportCtx *ctx = (struct _ImportCtx *)arg;
  83         gboolean result;
  84
  85         PROCESS_INFORMATION pi = {0};
  86         STARTUPINFO si = {0};
  87
  88         result = CreateProcess(NULL, ctx->cmd, NULL, NULL, FALSE,
  89                         NORMAL_PRIORITY_CLASS | CREATE_NO_WINDOW,
  90                         NULL, NULL, &si, &pi);
  91
  92         if (!result) {
  93                 debug_print("Couldn't execute '%s'\n", ctx->cmd);
  94         } else {
  95                 WaitForSingleObject(pi.hProcess, 10000);
  96                 result = GetExitCodeProcess(pi.hProcess, &ctx->exitcode);
  97                 if (ctx->exitcode == STILL_ACTIVE) {
  98                         debug_print("Process still running, terminating it.\n");
  99                         TerminateProcess(pi.hProcess, 255);
 100                 }
 101
 102                 CloseHandle(pi.hProcess);
 103                 CloseHandle(pi.hThread);
 104
 105                 if (!result) {
 106                         debug_print("Process executed, but we couldn't get its exit code (huh?)\n");
 107                 }
 108         }
 109
 110         ctx->done = TRUE;
 111         return NULL;
 112 }
 113 #endif
 114
 115 static void pgpview_show_mime_part(TextView *textview, MimeInfo *partinfo)
 116 {
 117         GtkTextView *text;
 118         GtkTextBuffer *buffer;
 119         GtkTextIter iter;
 120         gpgme_data_t sigdata = NULL;
 121         gpgme_verify_result_t sigstatus = NULL;
 122         gpgme_ctx_t ctx = NULL;
 123         gpgme_key_t key = NULL;
 124         gpgme_signature_t sig = NULL;
 125         gpgme_error_t err = 0;
 126         gboolean imported = FALSE;
 127         MsgInfo *msginfo = textview->messageview->msginfo;
 128
 129         if (!partinfo) return;
 130
 131         textview_set_font(textview, NULL);
 132         textview_clear(textview);
 133
 134         text = GTK_TEXT_VIEW(textview->text);
 135         buffer = gtk_text_view_get_buffer(text);
 136         gtk_text_buffer_get_start_iter(buffer, &iter);
 137
 138         err = gpgme_new (&ctx);
 139         if (err) {
 140                 debug_print("err : %s\n", gpgme_strerror(err));
 141                 textview_show_mime_part(textview, partinfo);
 142                 return;
 143         }
 144
 145         sigdata = sgpgme_data_from_mimeinfo(partinfo);
 146         if (!sigdata) {
 147                 g_warning("no sigdata");
 148                 textview_show_mime_part(textview, partinfo);
 149                 return;
 150         }
 151
 152         /* Here we do not care about what data we attempt to verify with the
 153          * signature, or about result of the verification - all we care about
 154          * is that we find out ID of the key used to make this signature. */
 155         sigstatus = sgpgme_verify_signature(ctx, sigdata, NULL, sigdata);
 156         if (!sigstatus || sigstatus == GINT_TO_POINTER(-GPG_ERR_SYSTEM_ERROR)) {
 157                 g_warning("no sigstatus");
 158                 textview_show_mime_part(textview, partinfo);
 159                 return;
 160         }
 161         sig = sigstatus->signatures;
 162         if (!sig) {
 163                 g_warning("no sig");
 164                 textview_show_mime_part(textview, partinfo);
 165                 return;
 166         }
 167         gpgme_get_key(ctx, sig->fpr, &key, 0);
 168         if (!key) {
 169                 gchar *gpgbin = get_gpg_executable_name();
 170                 gchar *from_addr = g_strdup(msginfo->from);
 171                 extract_address(from_addr);
 172                 gchar *cmd_ks = g_strdup_printf("\"%s\" --batch --no-tty --recv-keys %s",
 173                                 (gpgbin ? gpgbin : "gpg2"), sig->fpr);
 174                 gchar *cmd_wkd = g_strdup_printf("\"%s\" --batch --no-tty --locate-keys \"%s\"",
 175                                 (gpgbin ? gpgbin : "gpg2"), from_addr);
 176
 177                 AlertValue val = G_ALERTDEFAULT;
 178                 if (!prefs_common_get_prefs()->work_offline) {
 179                         val = alertpanel(_("Key import"),
 180                                 _("This key is not in your keyring. Do you want "
 181                                   "Claws Mail to try to import it?"),
 182                                   _("_No"), _("from keyserver"), _("from Web Key Directory"),
 183                                   ALERTFOCUS_SECOND);
 184                         GTK_EVENTS_FLUSH();
 185                 }
 186                 if (val == G_ALERTDEFAULT) {
 187                         TEXTVIEW_INSERT(_("\n  Key ID "));
 188                         TEXTVIEW_INSERT(sig->fpr);
 189                         TEXTVIEW_INSERT(":\n\n");
 190                         TEXTVIEW_INSERT(_("   This key is not in your keyring.\n"));
 191                         TEXTVIEW_INSERT(_("   It should be possible to import it "));
 192                         if (prefs_common_get_prefs()->work_offline)
 193                                 TEXTVIEW_INSERT(_("when working online,\n   or "));
 194                         TEXTVIEW_INSERT(_("with either of the following commands: \n\n     "));
 195                         TEXTVIEW_INSERT(cmd_ks);
 196                         TEXTVIEW_INSERT("\n\n");
 197                         TEXTVIEW_INSERT(cmd_wkd);
 198                 } else if (val == G_ALERTALTERNATE || val == G_ALERTOTHER) {
 199                         TEXTVIEW_INSERT(_("\n  Importing key ID "));
 200                         TEXTVIEW_INSERT(sig->fpr);
 201                         TEXTVIEW_INSERT(":\n\n");
 202
 203                         main_window_cursor_wait(mainwindow_get_mainwindow());
 204                         textview_cursor_wait(textview);
 205                         GTK_EVENTS_FLUSH();
 206
 207 #ifndef G_OS_WIN32
 208                         int res = 0;
 209                         pid_t pid = 0;
 210
 211                         pid = fork();
 212                         if (pid == -1) {
 213                                 res = -1;
 214                         } else if (pid == 0) {
 215                                 /* son */
 216                                 gchar **argv;
 217                                 if (val == G_ALERTOTHER)
 218                                         argv = strsplit_with_quote(cmd_wkd, " ", 0);
 219                                 else
 220                                         argv = strsplit_with_quote(cmd_ks, " ", 0);
 221                                 res = execvp(argv[0], argv);
 222                                 perror("execvp");
 223                                 exit(255);
 224                         } else {
 225                                 int status = 0;
 226                                 time_t start_wait = time(NULL);
 227                                 res = -1;
 228                                 do {
 229                                         if (waitpid(pid, &status, WNOHANG) == 0 || !WIFEXITED(status)) {
 230                                                 usleep(200000);
 231                                         } else {
 232                                                 res = WEXITSTATUS(status);
 233                                                 break;
 234                                         }
 235                                         if (time(NULL) - start_wait > 9) {
 236                                                 debug_print("SIGTERM'ing gpg %d\n", pid);
 237                                                 kill(pid, SIGTERM);
 238                                         }
 239                                         if (time(NULL) - start_wait > 10) {
 240                                                 debug_print("SIGKILL'ing gpg %d\n", pid);
 241                                                 kill(pid, SIGKILL);
 242                                                 break;
 243                                         }
 244                                 } while(1);
 245                         }
 246                         debug_print("res %d\n", res);
 247                         if (res == 0)
 248                                 imported = TRUE;
 249 #else
 250                         /* We need to call gpg in a separate thread, so that waiting for
 251                          * it to finish does not block the UI. */
 252                         pthread_t pt;
 253                         struct _ImportCtx *ctx = malloc(sizeof(struct _ImportCtx));
 254
 255                         ctx->done = FALSE;
 256                         ctx->exitcode = STILL_ACTIVE;
 257                         ctx->cmd = (val == G_ALERTOTHER)? cmd_wkd : cmd_ks;
 258
 259                         if (pthread_create(&pt, NULL,
 260                                                 _import_threaded, (void *)ctx) != 0) {
 261                                 debug_print("Couldn't create thread, continuing unthreaded.\n");
 262                                 _import_threaded(ctx);
 263                         } else {
 264                                 debug_print("Thread created, waiting for it to finish...\n");
 265                                 while (!ctx->done)
 266                                         claws_do_idle();
 267                         }
 268
 269                         debug_print("Thread finished.\n");
 270                         pthread_join(pt, NULL);
 271
 272                         if (ctx->exitcode == 0) {
 273                                 imported = TRUE;
 274                         }
 275                         g_free(ctx);
 276 #endif
 277                         main_window_cursor_normal(mainwindow_get_mainwindow());
 278                         textview_cursor_normal(textview);
 279                         if (imported) {
 280                                 TEXTVIEW_INSERT(_("   This key has been imported to your keyring.\n"));
 281                         } else {
 282                                 TEXTVIEW_INSERT(_("   This key couldn't be imported to your keyring.\n"));
 283                                 TEXTVIEW_INSERT(_("   Key servers are sometimes slow.\n"));
 284                                 TEXTVIEW_INSERT(_("   You can try to import it manually with the command:"));
 285                                 TEXTVIEW_INSERT("\n\n     ");
 286                                 TEXTVIEW_INSERT(cmd_ks);
 287                                 TEXTVIEW_INSERT("\n\n     ");
 288                                 TEXTVIEW_INSERT(_("or"));
 289                                 TEXTVIEW_INSERT("\n\n     ");
 290                                 TEXTVIEW_INSERT(cmd_wkd);
 291                         }
 292                 }
 293                 g_free(cmd_ks);
 294                 g_free(cmd_wkd);
 295                 g_free(from_addr);
 296         } else {
 297                 TEXTVIEW_INSERT(_("\n  Key ID "));
 298
 299 #if defined GPGME_VERSION_NUMBER && GPGME_VERSION_NUMBER >= 0x010700
 300                 TEXTVIEW_INSERT(key->fpr);
 301 #else
 302                 TEXTVIEW_INSERT(sig->fpr);
 303 #endif
 304
 305                 TEXTVIEW_INSERT(":\n\n");
 306                 TEXTVIEW_INSERT(_("   This key is in your keyring.\n"));
 307         }
 308         gpgme_data_release(sigdata);
 309         gpgme_release(ctx);
 310         textview_show_icon(textview, GTK_STOCK_DIALOG_AUTHENTICATION);
 311 }
 312
 313
 314 static void pgp_show_mimepart(MimeViewer *_viewer,
 315                                 const gchar *infile,
 316                                 MimeInfo *partinfo)
 317 {
 318         PgpViewer *viewer = (PgpViewer *)_viewer;
 319         debug_print("pgp_show_mimepart\n");
 320         viewer->textview->messageview = _viewer->mimeview->messageview;
 321         pgpview_show_mime_part(viewer->textview, partinfo);
 322 }
 323
 324 static void pgp_clear_viewer(MimeViewer *_viewer)
 325 {
 326         PgpViewer *viewer = (PgpViewer *)_viewer;
 327         debug_print("pgp_clear_viewer\n");
 328         textview_clear(viewer->textview);
 329 }
 330
 331 static void pgp_destroy_viewer(MimeViewer *_viewer)
 332 {
 333         PgpViewer *viewer = (PgpViewer *)_viewer;
 334         debug_print("pgp_destroy_viewer\n");
 335         textview_destroy(viewer->textview);
 336 }
 337
 338 static MimeViewer *pgp_viewer_create(void)
 339 {
 340         PgpViewer *viewer;
 341
 342         debug_print("pgp_viewer_create\n");
 343
 344         viewer = g_new0(PgpViewer, 1);
 345         viewer->mimeviewer.factory = &pgp_viewer_factory;
 346         viewer->mimeviewer.get_widget = pgp_get_widget;
 347         viewer->mimeviewer.show_mimepart = pgp_show_mimepart;
 348         viewer->mimeviewer.clear_viewer = pgp_clear_viewer;
 349         viewer->mimeviewer.destroy_viewer = pgp_destroy_viewer;
 350         viewer->mimeviewer.get_selection = NULL;
 351         viewer->textview = textview_create();
 352         textview_init(viewer->textview);
 353
 354         gtk_widget_show_all(viewer->textview->vbox);
 355
 356         return (MimeViewer *) viewer;
 357 }
 358
 359 static MimeViewerFactory pgp_viewer_factory =
 360 {
 361         content_types,
 362         0,
 363
 364         pgp_viewer_create,
 365 };
 366
 367 void pgp_viewer_init(void)
 368 {
 369         mimeview_register_viewer_factory(&pgp_viewer_factory);
 370 }
 371
 372 void pgp_viewer_done(void)
 373 {
 374         mimeview_unregister_viewer_factory(&pgp_viewer_factory);
 375
 376 }