src/plugins/pgpinline/pgpinline.c

   1 /*
   2  * Claws Mail -- a GTK based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2021 Colin Leroy and the Claws Mail team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #  include "config.h"
  21 #include "claws-features.h"
  22 #endif
  23
  24 #ifdef USE_GPGME
  25
  26 #include "defs.h"
  27 #include <glib.h>
  28 #include <glib/gi18n.h>
  29 #include <errno.h>
  30 #include <gpgme.h>
  31 #include <file-utils.h>
  32
  33 #include "utils.h"
  34 #include "privacy.h"
  35 #include "procmime.h"
  36 #include "pgpinline.h"
  37 #include <plugins/pgpcore/sgpgme.h>
  38 #include <plugins/pgpcore/prefs_gpg.h>
  39 #include <plugins/pgpcore/passphrase.h>
  40 #include <plugins/pgpcore/pgp_utils.h>
  41 #include "quoted-printable.h"
  42 #include "codeconv.h"
  43 #include "plugin.h"
  44
  45 extern struct GPGConfig prefs_gpg;
  46
  47 typedef struct _PrivacyDataPGP PrivacyDataPGP;
  48
  49 struct _PrivacyDataPGP
  50 {
  51         PrivacyData     data;
  52
  53         gboolean        done_sigtest;
  54         gboolean        is_signed;
  55 };
  56
  57 typedef struct _PGPInlineTaskData
  58 {
  59         gchar *rawtext;
  60         gchar *charset;
  61 } PGPInlineTaskData;
  62
  63 static PrivacySystem pgpinline_system;
  64
  65 static PrivacyDataPGP *pgpinline_new_privacydata()
  66 {
  67         PrivacyDataPGP *data;
  68
  69         data = g_new0(PrivacyDataPGP, 1);
  70         data->data.system = &pgpinline_system;
  71
  72         return data;
  73 }
  74
  75 static void pgpinline_free_privacydata(PrivacyData *data)
  76 {
  77         g_free(data);
  78 }
  79
  80 static gboolean pgpinline_is_signed(MimeInfo *mimeinfo)
  81 {
  82         PrivacyDataPGP *data = NULL;
  83         const gchar *sig_indicator = "-----BEGIN PGP SIGNED MESSAGE-----";
  84         gchar *textdata, *sigpos;
  85
  86         cm_return_val_if_fail(mimeinfo != NULL, FALSE);
  87
  88         if (procmime_mimeinfo_parent(mimeinfo) == NULL)
  89                 return FALSE; /* not parent */
  90
  91         if (mimeinfo->type != MIMETYPE_TEXT &&
  92                 (mimeinfo->type != MIMETYPE_APPLICATION ||
  93                  g_ascii_strcasecmp(mimeinfo->subtype, "pgp")))
  94                 return FALSE;
  95
  96         /* Seal the deal. This has to be text/plain through and through. */
  97         if (mimeinfo->type == MIMETYPE_APPLICATION)
  98         {
  99                 mimeinfo->type = MIMETYPE_TEXT;
 100                 g_free(mimeinfo->subtype);
 101                 mimeinfo->subtype = g_strdup("plain");
 102         }
 103
 104         if (mimeinfo->privacy != NULL) {
 105                 data = (PrivacyDataPGP *) mimeinfo->privacy;
 106                 if (data->done_sigtest)
 107                         return data->is_signed;
 108         }
 109
 110         textdata = procmime_get_part_as_string(mimeinfo, TRUE);
 111         if (!textdata)
 112                 return FALSE;
 113
 114         if ((sigpos = strstr(textdata, sig_indicator)) == NULL) {
 115                 g_free(textdata);
 116                 return FALSE;
 117         }
 118
 119         if (!(sigpos == textdata) && !(sigpos[-1] == '\n')) {
 120                 g_free(textdata);
 121                 return FALSE;
 122         }
 123
 124         g_free(textdata);
 125
 126         if (data == NULL) {
 127                 data = pgpinline_new_privacydata();
 128                 mimeinfo->privacy = (PrivacyData *) data;
 129         }
 130         if (data != NULL) {
 131                 data->done_sigtest = TRUE;
 132                 data->is_signed = TRUE;
 133         }
 134
 135         return TRUE;
 136 }
 137
 138 static void pgpinline_free_task_data(gpointer data)
 139 {
 140         PGPInlineTaskData *task_data = (PGPInlineTaskData *)data;
 141
 142         g_free(task_data->rawtext);
 143         g_free(task_data->charset);
 144         g_free(task_data);
 145 }
 146
 147 static gchar *get_sig_data(gchar *rawtext, gchar *charset)
 148 {
 149         gchar *conv;
 150
 151         conv = conv_codeset_strdup(rawtext, CS_UTF_8, charset);
 152         if (!conv)
 153                 conv = conv_codeset_strdup(rawtext, CS_UTF_8, conv_get_locale_charset_str_no_utf8());
 154
 155         if (!conv) {
 156                 g_warning("can't convert charset to anything sane");
 157                 conv = conv_codeset_strdup(rawtext, CS_UTF_8, CS_US_ASCII);
 158         }
 159
 160         return conv;
 161 }
 162
 163 static void pgpinline_check_sig_task(GTask *task,
 164         gpointer source_object,
 165         gpointer g_task_data,
 166         GCancellable *cancellable)
 167 {
 168         PGPInlineTaskData *task_data = (PGPInlineTaskData *)g_task_data;
 169         GQuark domain;
 170         gpgme_ctx_t ctx;
 171         gpgme_error_t err;
 172         gpgme_data_t sigdata = NULL;
 173         gpgme_data_t plain = NULL;
 174         gpgme_verify_result_t gpgme_res;
 175         gboolean return_err = TRUE;
 176         gboolean cancelled = FALSE;
 177         SigCheckTaskResult *task_result = NULL;
 178         gchar *textstr;
 179         char err_str[GPGERR_BUFSIZE] = "";
 180
 181         domain = g_quark_from_static_string("claws_pgpinline");
 182
 183         err = gpgme_new(&ctx);
 184         if (err != GPG_ERR_NO_ERROR) {
 185                 gpgme_strerror_r(err, err_str, GPGERR_BUFSIZE);
 186                 g_warning("couldn't initialize GPG context: %s", err_str);
 187                 goto out;
 188         }
 189
 190         gpgme_set_textmode(ctx, 1);
 191         gpgme_set_armor(ctx, 1);
 192
 193         textstr = get_sig_data(task_data->rawtext, task_data->charset);
 194         if (!textstr) {
 195                 err = GPG_ERR_GENERAL;
 196                 g_snprintf(err_str, GPGERR_BUFSIZE, "Couldn't convert text data to any sane charset.");
 197                 goto out_ctx;
 198         }
 199
 200         err = gpgme_data_new_from_mem(&sigdata, textstr, strlen(textstr), 1);
 201         if (err != GPG_ERR_NO_ERROR) {
 202                 gpgme_strerror_r(err, err_str, GPGERR_BUFSIZE);
 203                 g_warning("gpgme_data_new_from_mem failed: %s", err_str);
 204                 goto out_textstr;
 205         }
 206
 207         err = gpgme_data_new(&plain);
 208         if (err != GPG_ERR_NO_ERROR) {
 209                 gpgme_strerror_r(err, err_str, GPGERR_BUFSIZE);
 210                 g_warning("gpgme_data_new failed: %s", err_str);
 211                 goto out_sigdata;
 212         }
 213
 214         if (g_task_return_error_if_cancelled(task)) {
 215                 debug_print("task was cancelled, aborting task:%p\n", task);
 216                 cancelled = TRUE;
 217                 goto out_sigdata;
 218         }
 219
 220         err = gpgme_op_verify(ctx, sigdata, NULL, plain);
 221         if (err != GPG_ERR_NO_ERROR) {
 222                 gpgme_strerror_r(err, err_str, GPGERR_BUFSIZE);
 223                 g_warning("gpgme_op_verify failed: %s\n", err_str);
 224                 goto out_plain;
 225         }
 226
 227         if (g_task_return_error_if_cancelled(task)) {
 228                 debug_print("task was cancelled, aborting task:%p\n", task);
 229                 cancelled = TRUE;
 230                 goto out_sigdata;
 231         }
 232
 233         gpgme_res = gpgme_op_verify_result(ctx);
 234         if (gpgme_res && gpgme_res->signatures == NULL) {
 235                 err = GPG_ERR_SYSTEM_ERROR;
 236                 g_warning("no signature found");
 237                 g_snprintf(err_str, GPGERR_BUFSIZE, "No signature found");
 238                 goto out_plain;
 239         }
 240
 241         task_result = g_new0(SigCheckTaskResult, 1);
 242         task_result->sig_data = g_new0(SignatureData, 1);
 243
 244         task_result->sig_data->status = sgpgme_sigstat_gpgme_to_privacy(ctx, gpgme_res);
 245         task_result->sig_data->info_short = sgpgme_sigstat_info_short(ctx, gpgme_res);
 246         task_result->sig_data->info_full = sgpgme_sigstat_info_full(ctx, gpgme_res);
 247
 248         return_err = FALSE;
 249
 250 out_plain:
 251         gpgme_data_release(plain);
 252 out_sigdata:
 253         gpgme_data_release(sigdata);
 254 out_textstr:
 255         g_free(textstr);
 256 out_ctx:
 257         gpgme_release(ctx);
 258 out:
 259         if (cancelled)
 260                 return;
 261
 262         if (return_err)
 263                 g_task_return_new_error(task, domain, err, "%s", err_str);
 264         else
 265                 g_task_return_pointer(task, task_result, privacy_free_sig_check_task_result);
 266 }
 267
 268 static gint pgpinline_check_sig_async(MimeInfo *mimeinfo,
 269         GCancellable *cancellable,
 270         GAsyncReadyCallback callback,
 271         gpointer user_data)
 272 {
 273         GTask *task;
 274         PGPInlineTaskData *task_data;
 275         gchar *rawtext;
 276         const gchar *charset;
 277
 278         if (procmime_mimeinfo_parent(mimeinfo) == NULL) {
 279                 g_warning("Checking signature on incorrect part");
 280                 return -1;
 281         }
 282
 283         if (mimeinfo->type != MIMETYPE_TEXT) {
 284                 g_warning("Checking signature on a non-text part");
 285                 return -1;
 286         }
 287
 288         rawtext = procmime_get_part_as_string(mimeinfo, TRUE);
 289         if (rawtext == NULL) {
 290                 g_warning("Failed to get part as string");
 291                 return -1;
 292         }
 293
 294         charset = procmime_mimeinfo_get_parameter(mimeinfo, "charset");
 295
 296         task_data = g_new0(PGPInlineTaskData, 1);
 297         task_data->rawtext = rawtext;
 298         task_data->charset = g_strdup(charset);
 299
 300         task = g_task_new(NULL, cancellable, callback, user_data);
 301         mimeinfo->last_sig_check_task = task;
 302
 303         g_task_set_task_data(task, task_data, pgpinline_free_task_data);
 304         debug_print("creating check sig async task:%p task_data:%p\n", task, task_data);
 305         g_task_set_return_on_cancel(task, TRUE);
 306         g_task_run_in_thread(task, pgpinline_check_sig_task);
 307         g_object_unref(task);
 308
 309         return 0;
 310 }
 311
 312 static gboolean pgpinline_is_encrypted(MimeInfo *mimeinfo)
 313 {
 314         const gchar *begin_indicator = "-----BEGIN PGP MESSAGE-----";
 315         const gchar *end_indicator = "-----END PGP MESSAGE-----";
 316         gchar *textdata;
 317
 318         cm_return_val_if_fail(mimeinfo != NULL, FALSE);
 319
 320         if (procmime_mimeinfo_parent(mimeinfo) == NULL)
 321                 return FALSE; /* not parent */
 322
 323         if (mimeinfo->type != MIMETYPE_TEXT &&
 324                 (mimeinfo->type != MIMETYPE_APPLICATION ||
 325                  g_ascii_strcasecmp(mimeinfo->subtype, "pgp")))
 326                 return FALSE;
 327
 328         /* Seal the deal. This has to be text/plain through and through. */
 329         if (mimeinfo->type == MIMETYPE_APPLICATION)
 330         {
 331                 mimeinfo->type = MIMETYPE_TEXT;
 332                 g_free(mimeinfo->subtype);
 333                 mimeinfo->subtype = g_strdup("plain");
 334         }
 335
 336         textdata = procmime_get_part_as_string(mimeinfo, TRUE);
 337         if (!textdata)
 338                 return FALSE;
 339
 340         if (!pgp_locate_armor_header(textdata, begin_indicator)) {
 341                 g_free(textdata);
 342                 return FALSE;
 343         }
 344         if (!pgp_locate_armor_header(textdata, end_indicator)) {
 345                 g_free(textdata);
 346                 return FALSE;
 347         }
 348
 349         g_free(textdata);
 350
 351         return TRUE;
 352 }
 353
 354 static MimeInfo *pgpinline_decrypt(MimeInfo *mimeinfo)
 355 {
 356         MimeInfo *decinfo, *parseinfo;
 357         gpgme_data_t cipher, plain;
 358         FILE *dstfp;
 359         gchar *fname;
 360         gchar *textdata = NULL;
 361         static gint id = 0;
 362         const gchar *src_codeset = NULL;
 363         gpgme_verify_result_t sigstat = 0;
 364         PrivacyDataPGP *data = NULL;
 365         gpgme_ctx_t ctx;
 366         gchar *chars;
 367         size_t len;
 368         const gchar *begin_indicator = "-----BEGIN PGP MESSAGE-----";
 369         const gchar *end_indicator = "-----END PGP MESSAGE-----";
 370         gchar *pos;
 371         SignatureData *sig_data = NULL;
 372
 373         if (gpgme_new(&ctx) != GPG_ERR_NO_ERROR)
 374                 return NULL;
 375
 376         gpgme_set_textmode(ctx, 1);
 377         gpgme_set_armor(ctx, 1);
 378
 379         cm_return_val_if_fail(mimeinfo != NULL, NULL);
 380         cm_return_val_if_fail(pgpinline_is_encrypted(mimeinfo), NULL);
 381
 382         if (procmime_mimeinfo_parent(mimeinfo) == NULL ||
 383             mimeinfo->type != MIMETYPE_TEXT) {
 384                 gpgme_release(ctx);
 385                 privacy_set_error(_("Couldn't parse mime part."));
 386                 return NULL;
 387         }
 388
 389         textdata = procmime_get_part_as_string(mimeinfo, TRUE);
 390         if (!textdata) {
 391                 gpgme_release(ctx);
 392                 privacy_set_error(_("Couldn't get text data."));
 393                 return NULL;
 394         }
 395
 396         debug_print("decrypting '%s'\n", textdata);
 397         gpgme_data_new_from_mem(&cipher, textdata, (size_t)strlen(textdata), 1);
 398
 399         plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
 400
 401         if (sigstat != NULL && sigstat->signatures != NULL) {
 402                 sig_data = g_new0(SignatureData, 1);
 403                 sig_data->status = sgpgme_sigstat_gpgme_to_privacy(ctx, sigstat);
 404                 sig_data->info_short = sgpgme_sigstat_info_short(ctx, sigstat);
 405                 sig_data->info_full = sgpgme_sigstat_info_full(ctx, sigstat);
 406         }
 407
 408         gpgme_release(ctx);
 409         gpgme_data_release(cipher);
 410
 411         if (plain == NULL) {
 412                 g_free(textdata);
 413                 if (sig_data)
 414                         privacy_free_signature_data(sig_data);
 415                 return NULL;
 416         }
 417
 418         fname = g_strdup_printf("%s%cplaintext.%08x",
 419                 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
 420
 421         if ((dstfp = claws_fopen(fname, "wb")) == NULL) {
 422                 FILE_OP_ERROR(fname, "claws_fopen");
 423                 privacy_set_error(_("Couldn't open decrypted file %s"), fname);
 424                 if (sig_data)
 425                         privacy_free_signature_data(sig_data);
 426                 g_free(textdata);
 427                 g_free(fname);
 428                 gpgme_data_release(plain);
 429                 return NULL;
 430         }
 431
 432         src_codeset = procmime_mimeinfo_get_parameter(mimeinfo, "charset");
 433         if (src_codeset == NULL)
 434                 src_codeset = CS_ISO_8859_1;
 435
 436         if (fprintf(dstfp, "MIME-Version: 1.0\r\n"
 437                         "Content-Type: text/plain; charset=%s\r\n"
 438                         "Content-Transfer-Encoding: 8bit\r\n"
 439                         "\r\n",
 440                         src_codeset) < 0) {
 441                 FILE_OP_ERROR(fname, "fprintf");
 442                 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 443                 goto FILE_ERROR;
 444         }
 445
 446         /* Store any part before encrypted text */
 447         pos = pgp_locate_armor_header(textdata, begin_indicator);
 448         if (pos != NULL && (pos - textdata) > 0) {
 449                 if (claws_fwrite(textdata, 1, pos - textdata, dstfp) < pos - textdata) {
 450                         FILE_OP_ERROR(fname, "claws_fwrite");
 451                         privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 452                         goto FILE_ERROR;
 453                 }
 454         }
 455
 456         if (claws_fwrite(_("\n--- Start of PGP/Inline encrypted data ---\n"), 1,
 457                 strlen(_("\n--- Start of PGP/Inline encrypted data ---\n")),
 458                 dstfp) < strlen(_("\n--- Start of PGP/Inline encrypted data ---\n"))) {
 459                 FILE_OP_ERROR(fname, "claws_fwrite");
 460                 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 461                 goto FILE_ERROR;
 462         }
 463         chars = sgpgme_data_release_and_get_mem(plain, &len);
 464         if (len > 0) {
 465                 if (claws_fwrite(chars, 1, len, dstfp) < len) {
 466                         FILE_OP_ERROR(fname, "claws_fwrite");
 467                         g_free(chars);
 468                         privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 469                         goto FILE_ERROR;
 470                 }
 471         }
 472         g_free(chars);
 473         /* Store any part after encrypted text */
 474         if (claws_fwrite(_("--- End of PGP/Inline encrypted data ---\n"), 1,
 475                 strlen(_("--- End of PGP/Inline encrypted data ---\n")),
 476                 dstfp) < strlen(_("--- End of PGP/Inline encrypted data ---\n"))) {
 477                         FILE_OP_ERROR(fname, "claws_fwrite");
 478                         privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 479                         goto FILE_ERROR;
 480         }
 481         if (pos != NULL) {
 482             pos = pgp_locate_armor_header(pos, end_indicator);
 483             if (pos != NULL && *pos != '\0') {
 484                 pos += strlen(end_indicator);
 485                 if (claws_fwrite(pos, 1, strlen(pos), dstfp) < strlen(pos)) {
 486                         FILE_OP_ERROR(fname, "claws_fwrite");
 487                         privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 488                         goto FILE_ERROR;
 489                 }
 490             }
 491         }
 492
 493         g_free(textdata);
 494
 495         if (claws_safe_fclose(dstfp) == EOF) {
 496                 FILE_OP_ERROR(fname, "claws_fclose");
 497                 privacy_set_error(_("Couldn't close decrypted file %s"), fname);
 498                 g_free(fname);
 499                 gpgme_data_release(plain);
 500                 if (sig_data)
 501                         privacy_free_signature_data(sig_data);
 502                 return NULL;
 503         }
 504
 505         parseinfo = procmime_scan_file(fname);
 506         g_free(fname);
 507
 508         if (parseinfo == NULL) {
 509                 privacy_set_error(_("Couldn't scan decrypted file."));
 510                 if (sig_data)
 511                         privacy_free_signature_data(sig_data);
 512                 return NULL;
 513         }
 514         decinfo = g_node_first_child(parseinfo->node) != NULL ?
 515                 g_node_first_child(parseinfo->node)->data : NULL;
 516
 517         if (decinfo == NULL) {
 518                 privacy_set_error(_("Couldn't scan decrypted file parts."));
 519                 if (sig_data)
 520                         privacy_free_signature_data(sig_data);
 521                 return NULL;
 522         }
 523
 524         g_node_unlink(decinfo->node);
 525         procmime_mimeinfo_free_all(&parseinfo);
 526
 527         decinfo->tmp = TRUE;
 528
 529         if (sig_data != NULL) {
 530                 if (decinfo->privacy != NULL) {
 531                         data = (PrivacyDataPGP *) decinfo->privacy;
 532                 } else {
 533                         data = pgpinline_new_privacydata();
 534                         decinfo->privacy = (PrivacyData *) data;
 535                 }
 536                 if (data != NULL) {
 537                         data->done_sigtest = TRUE;
 538                         data->is_signed = TRUE;
 539                         decinfo->sig_data = sig_data;
 540                 }
 541         }
 542
 543         return decinfo;
 544
 545 FILE_ERROR:
 546         if (sig_data)
 547                 privacy_free_signature_data(sig_data);
 548         g_free(textdata);
 549         claws_fclose(dstfp);
 550         g_free(fname);
 551         gpgme_data_release(plain);
 552         return NULL;
 553 }
 554
 555 static gboolean pgpinline_sign(MimeInfo *mimeinfo, PrefsAccount *account, const gchar *from_addr)
 556 {
 557         MimeInfo *msgcontent;
 558         gchar *textstr, *tmp;
 559         FILE *fp;
 560         gchar *sigcontent;
 561         gpgme_ctx_t ctx;
 562         gpgme_data_t gpgtext, gpgsig;
 563         size_t len;
 564         gpgme_error_t err;
 565         struct passphrase_cb_info_s info;
 566         gpgme_sign_result_t result = NULL;
 567
 568         memset (&info, 0, sizeof info);
 569
 570         /* get content node from message */
 571         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 572         if (msgcontent->type == MIMETYPE_MULTIPART) {
 573                 if (!msgcontent->node->children) {
 574                         debug_print("msgcontent->node->children NULL, bailing\n");
 575                         privacy_set_error(_("Malformed message"));
 576                         return FALSE;
 577                 }
 578                 msgcontent = (MimeInfo *) msgcontent->node->children->data;
 579         }
 580         /* get rid of quoted-printable or anything */
 581         procmime_decode_content(msgcontent);
 582
 583         fp = my_tmpfile();
 584         if (fp == NULL) {
 585                 perror("my_tmpfile");
 586                 privacy_set_error(_("Couldn't create temporary file, %s"), g_strerror(errno));
 587                 return FALSE;
 588         }
 589         procmime_write_mimeinfo(msgcontent, fp);
 590         rewind(fp);
 591
 592         /* read temporary file into memory */
 593         textstr = file_read_stream_to_str_no_recode(fp);
 594
 595         claws_fclose(fp);
 596
 597         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 598         gpgme_data_new(&gpgsig);
 599         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 600                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
 601                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 602                 return FALSE;
 603         }
 604         gpgme_set_textmode(ctx, 1);
 605         gpgme_set_armor(ctx, 1);
 606
 607         if (!sgpgme_setup_signers(ctx, account, from_addr)) {
 608                 gpgme_release(ctx);
 609                 return FALSE;
 610         }
 611
 612         prefs_gpg_enable_agent(prefs_gpg_get_config()->use_gpg_agent);
 613         if (!g_getenv("GPG_AGENT_INFO") || !prefs_gpg_get_config()->use_gpg_agent) {
 614                 info.c = ctx;
 615                 gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
 616         }
 617
 618         err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_CLEAR);
 619         if (err != GPG_ERR_NO_ERROR) {
 620                 if (err == GPG_ERR_CANCELED) {
 621                         /* ignore cancelled signing */
 622                         privacy_reset_error();
 623                         debug_print("gpgme_op_sign cancelled\n");
 624                 } else {
 625                         privacy_set_error(_("Data signing failed, %s"), gpgme_strerror(err));
 626                         debug_print("gpgme_op_sign error : %x\n", err);
 627                 }
 628                 gpgme_release(ctx);
 629                 return FALSE;
 630         }
 631         result = gpgme_op_sign_result(ctx);
 632         if (result && result->signatures) {
 633                 gpgme_new_signature_t sig = result->signatures;
 634                 while (sig) {
 635                         debug_print("valid signature: %s\n", sig->fpr);
 636                         sig = sig->next;
 637                 }
 638         } else if (result && result->invalid_signers) {
 639                 gpgme_invalid_key_t invalid = result->invalid_signers;
 640                 while (invalid) {
 641                         g_warning("invalid signer: %s (%s)", invalid->fpr,
 642                                 gpgme_strerror(invalid->reason));
 643                         privacy_set_error(_("Data signing failed due to invalid signer: %s"),
 644                                 gpgme_strerror(invalid->reason));
 645                         invalid = invalid->next;
 646                 }
 647                 gpgme_release(ctx);
 648                 return FALSE;
 649         } else {
 650                 /* can't get result (maybe no signing key?) */
 651                 debug_print("gpgme_op_sign_result error\n");
 652                 privacy_set_error(_("Data signing failed, no results."));
 653                 gpgme_release(ctx);
 654                 return FALSE;
 655         }
 656
 657
 658         sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
 659
 660         if (sigcontent == NULL || len <= 0) {
 661                 g_warning("sgpgme_data_release_and_get_mem failed");
 662                 privacy_set_error(_("Data signing failed, no contents."));
 663                 gpgme_data_release(gpgtext);
 664                 g_free(textstr);
 665                 g_free(sigcontent);
 666                 gpgme_release(ctx);
 667                 return FALSE;
 668         }
 669
 670         tmp = g_malloc(len+1);
 671         memmove(tmp, sigcontent, len+1);
 672         tmp[len] = '\0';
 673         gpgme_data_release(gpgtext);
 674         g_free(textstr);
 675         g_free(sigcontent);
 676
 677         if (msgcontent->content == MIMECONTENT_FILE &&
 678             msgcontent->data.filename != NULL) {
 679                 if (msgcontent->tmp == TRUE)
 680                         claws_unlink(msgcontent->data.filename);
 681                 g_free(msgcontent->data.filename);
 682         }
 683         msgcontent->data.mem = g_strdup(tmp);
 684         msgcontent->content = MIMECONTENT_MEM;
 685         g_free(tmp);
 686
 687         /* avoid all sorts of clear-signing problems with non ascii
 688          * chars
 689          */
 690         procmime_encode_content(msgcontent, ENC_BASE64);
 691         gpgme_release(ctx);
 692
 693         return TRUE;
 694 }
 695
 696 static gchar *pgpinline_get_encrypt_data(GSList *recp_names)
 697 {
 698         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_OpenPGP);
 699 }
 700
 701 static const gchar *pgpinline_get_encrypt_warning(void)
 702 {
 703         if (prefs_gpg_should_skip_encryption_warning(pgpinline_system.id))
 704                 return NULL;
 705         else
 706                 return _("Please note that attachments are not encrypted by "
 707                  "the PGP/Inline system, nor are email headers, like Subject.");
 708 }
 709
 710 static void pgpinline_inhibit_encrypt_warning(gboolean inhibit)
 711 {
 712         if (inhibit)
 713                 prefs_gpg_add_skip_encryption_warning(pgpinline_system.id);
 714         else
 715                 prefs_gpg_remove_skip_encryption_warning(pgpinline_system.id);
 716 }
 717
 718 static gboolean pgpinline_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
 719 {
 720         MimeInfo *msgcontent;
 721         FILE *fp;
 722         gchar *enccontent;
 723         size_t len;
 724         gchar *textstr, *tmp;
 725         gpgme_data_t gpgtext, gpgenc;
 726         gpgme_ctx_t ctx;
 727         gpgme_key_t *kset = NULL;
 728         gchar **fprs = g_strsplit(encrypt_data, " ", -1);
 729         gpgme_error_t err;
 730         gint i = 0;
 731
 732         while (fprs[i] && strlen(fprs[i])) {
 733                 i++;
 734         }
 735
 736         kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
 737         memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
 738         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 739                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
 740                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 741                 g_free(kset);
 742                 g_free(fprs);
 743                 return FALSE;
 744         }
 745         i = 0;
 746         while (fprs[i] && strlen(fprs[i])) {
 747                 gpgme_key_t key;
 748                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
 749                 if (err) {
 750                         debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
 751                         privacy_set_error(_("Couldn't add GPG key %s, %s"), fprs[i], gpgme_strerror(err));
 752                         for (gint x = 0; x < i; x++)
 753                                 gpgme_key_unref(kset[x]);
 754                         g_free(kset);
 755                         g_free(fprs);
 756                         return FALSE;
 757                 }
 758                 debug_print("found %s at %d\n", fprs[i], i);
 759                 kset[i] = key;
 760                 i++;
 761         }
 762
 763         debug_print("Encrypting message content\n");
 764
 765         /* get content node from message */
 766         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 767         if (msgcontent->type == MIMETYPE_MULTIPART) {
 768                 if (!msgcontent->node->children) {
 769                         debug_print("msgcontent->node->children NULL, bailing\n");
 770                         privacy_set_error(_("Malformed message"));
 771                         for (gint x = 0; x < i; x++)
 772                                 gpgme_key_unref(kset[x]);
 773                         g_free(kset);
 774                         g_free(fprs);
 775                         return FALSE;
 776                 }
 777                 msgcontent = (MimeInfo *) msgcontent->node->children->data;
 778         }
 779         /* get rid of quoted-printable or anything */
 780         procmime_decode_content(msgcontent);
 781
 782         fp = my_tmpfile();
 783         if (fp == NULL) {
 784                 privacy_set_error(_("Couldn't create temporary file, %s"), g_strerror(errno));
 785                 perror("my_tmpfile");
 786                 for (gint x = 0; x < i; x++)
 787                         gpgme_key_unref(kset[x]);
 788                 g_free(kset);
 789                 g_free(fprs);
 790                 return FALSE;
 791         }
 792         procmime_write_mimeinfo(msgcontent, fp);
 793         rewind(fp);
 794
 795         /* read temporary file into memory */
 796         textstr = file_read_stream_to_str_no_recode(fp);
 797
 798         claws_fclose(fp);
 799
 800         /* encrypt data */
 801         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 802         gpgme_data_new(&gpgenc);
 803         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 804                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
 805                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 806                 for (gint x = 0; x < i; x++)
 807                         gpgme_key_unref(kset[x]);
 808                 g_free(kset);
 809                 g_free(fprs);
 810                 return FALSE;
 811         }
 812         gpgme_set_armor(ctx, 1);
 813
 814         err = gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
 815
 816         enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
 817         for (gint x = 0; x < i; x++)
 818                 gpgme_key_unref(kset[x]);
 819         g_free(kset);
 820
 821         if (enccontent == NULL || len <= 0) {
 822                 g_warning("sgpgme_data_release_and_get_mem failed");
 823                 privacy_set_error(_("Encryption failed, %s"), gpgme_strerror(err));
 824                 gpgme_data_release(gpgtext);
 825                 g_free(textstr);
 826                 gpgme_release(ctx);
 827                 g_free(enccontent);
 828                 g_free(fprs);
 829                 return FALSE;
 830         }
 831
 832         tmp = g_malloc(len+1);
 833         memmove(tmp, enccontent, len+1);
 834         tmp[len] = '\0';
 835         g_free(enccontent);
 836
 837         gpgme_data_release(gpgtext);
 838         g_free(textstr);
 839
 840         if (msgcontent->content == MIMECONTENT_FILE &&
 841             msgcontent->data.filename != NULL) {
 842                 if (msgcontent->tmp == TRUE)
 843                         claws_unlink(msgcontent->data.filename);
 844                 g_free(msgcontent->data.filename);
 845         }
 846         msgcontent->data.mem = g_strdup(tmp);
 847         msgcontent->content = MIMECONTENT_MEM;
 848         g_free(tmp);
 849         gpgme_release(ctx);
 850
 851         g_free(fprs);
 852
 853         return TRUE;
 854 }
 855
 856 static PrivacySystem pgpinline_system = {
 857         "pgpinline",                    /* id */
 858         "PGP Inline",                   /* name */
 859
 860         pgpinline_free_privacydata,     /* free_privacydata */
 861
 862         pgpinline_is_signed,            /* is_signed(MimeInfo *) */
 863         pgpinline_check_sig_async,
 864
 865         pgpinline_is_encrypted,         /* is_encrypted(MimeInfo *) */
 866         pgpinline_decrypt,              /* decrypt(MimeInfo *) */
 867
 868         TRUE,
 869         pgpinline_sign,
 870
 871         TRUE,
 872         pgpinline_get_encrypt_data,
 873         pgpinline_encrypt,
 874         pgpinline_get_encrypt_warning,
 875         pgpinline_inhibit_encrypt_warning,
 876         prefs_gpg_auto_check_signatures,
 877 };
 878
 879 void pgpinline_init()
 880 {
 881         privacy_register_system(&pgpinline_system);
 882 }
 883
 884 void pgpinline_done()
 885 {
 886         privacy_unregister_system(&pgpinline_system);
 887 }
 888
 889 struct PluginFeature *plugin_provides(void)
 890 {
 891         static struct PluginFeature features[] =
 892                 { {PLUGIN_PRIVACY, N_("PGP/Inline")},
 893                   {PLUGIN_NOTHING, NULL}};
 894         return features;
 895 }
 896 #endif /* USE_GPGME */