src/plugins/pgpinline/pgpinline.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2012 Colin Leroy <colin@colino.net> and
   4  * the Claws Mail team
   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 #ifdef USE_GPGME
  27
  28 #include "defs.h"
  29 #include <glib.h>
  30 #include <glib/gi18n.h>
  31 #include <errno.h>
  32 #include <gpgme.h>
  33
  34 #include "utils.h"
  35 #include "privacy.h"
  36 #include "procmime.h"
  37 #include "pgpinline.h"
  38 #include <plugins/pgpcore/sgpgme.h>
  39 #include <plugins/pgpcore/prefs_gpg.h>
  40 #include <plugins/pgpcore/passphrase.h>
  41 #include "quoted-printable.h"
  42 #include "base64.h"
  43 #include "codeconv.h"
  44 #include "plugin.h"
  45
  46 extern struct GPGConfig prefs_gpg;
  47
  48 typedef struct _PrivacyDataPGP PrivacyDataPGP;
  49
  50 struct _PrivacyDataPGP
  51 {
  52         PrivacyData     data;
  53
  54         gboolean        done_sigtest;
  55         gboolean        is_signed;
  56         gpgme_verify_result_t   sigstatus;
  57         gpgme_ctx_t     ctx;
  58 };
  59
  60 static PrivacySystem pgpinline_system;
  61
  62 static gint pgpinline_check_signature(MimeInfo *mimeinfo);
  63
  64 static PrivacyDataPGP *pgpinline_new_privacydata()
  65 {
  66         PrivacyDataPGP *data;
  67         gpgme_error_t err;
  68
  69         data = g_new0(PrivacyDataPGP, 1);
  70         data->data.system = &pgpinline_system;
  71         data->done_sigtest = FALSE;
  72         data->is_signed = FALSE;
  73         data->sigstatus = NULL;
  74         if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
  75                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
  76                 return NULL;
  77         }
  78
  79         return data;
  80 }
  81
  82 static void pgpinline_free_privacydata(PrivacyData *_data)
  83 {
  84         PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
  85         gpgme_release(data->ctx);
  86         g_free(data);
  87 }
  88
  89 static gchar *fp_read_noconv(FILE *fp)
  90 {
  91         GByteArray *array;
  92         guchar buf[BUFSIZ];
  93         gint n_read;
  94         gchar *result = NULL;
  95
  96         if (!fp)
  97                 return NULL;
  98         array = g_byte_array_new();
  99
 100         while ((n_read = fread(buf, sizeof(gchar), sizeof(buf), fp)) > 0) {
 101                 if (n_read < sizeof(buf) && ferror(fp))
 102                         break;
 103                 g_byte_array_append(array, buf, n_read);
 104         }
 105
 106         if (ferror(fp)) {
 107                 FILE_OP_ERROR("file stream", "fread");
 108                 g_byte_array_free(array, TRUE);
 109                 return NULL;
 110         }
 111
 112         buf[0] = '\0';
 113         g_byte_array_append(array, buf, 1);
 114         result = (gchar *)array->data;
 115         g_byte_array_free(array, FALSE);
 116
 117         return result;
 118 }
 119
 120 static gchar *get_part_as_string(MimeInfo *mimeinfo)
 121 {
 122         gchar *textdata = NULL;
 123         gchar *filename = NULL;
 124         FILE *fp;
 125
 126         cm_return_val_if_fail(mimeinfo != NULL, 0);
 127         procmime_decode_content(mimeinfo);
 128
 129         if (mimeinfo->content == MIMECONTENT_MEM)
 130                 textdata = g_strdup(mimeinfo->data.mem);
 131         else {
 132                 filename = procmime_get_tmp_file_name(mimeinfo);
 133                 if (procmime_get_part(filename, mimeinfo) < 0) {
 134                         printf("error dumping file\n");
 135                         return NULL;
 136                 }
 137                 fp = g_fopen(filename,"rb");
 138                 if (!fp) {
 139                         printf("error reading file\n");
 140                         return NULL;
 141                 }
 142                 textdata = fp_read_noconv(fp);
 143                 fclose(fp);
 144                 g_unlink(filename);
 145                 g_free(filename);
 146         }
 147
 148         if (!g_utf8_validate(textdata, -1, NULL)) {
 149                 gchar *tmp = NULL;
 150                 codeconv_set_strict(TRUE);
 151                 if (procmime_mimeinfo_get_parameter(mimeinfo, "charset")) {
 152                         tmp = conv_codeset_strdup(textdata,
 153                                 procmime_mimeinfo_get_parameter(mimeinfo, "charset"),
 154                                 CS_UTF_8);
 155                 }
 156                 if (!tmp) {
 157                         tmp = conv_codeset_strdup(textdata,
 158                                 conv_get_locale_charset_str_no_utf8(),
 159                                 CS_UTF_8);
 160                 }
 161                 codeconv_set_strict(FALSE);
 162                 if (!tmp) {
 163                         tmp = conv_codeset_strdup(textdata,
 164                                 conv_get_locale_charset_str_no_utf8(),
 165                                 CS_UTF_8);
 166                 }
 167                 if (tmp) {
 168                         g_free(textdata);
 169                         textdata = tmp;
 170                 }
 171         }
 172
 173         return textdata;
 174 }
 175
 176 static gchar *pgpinline_locate_armor_header(gchar *textdata, const gchar *armor_header)
 177 {
 178         gchar *pos;
 179
 180         pos = strstr(textdata, armor_header);
 181         /*
 182          * It's only a valid armor header if it's at the
 183          * beginning of the buffer or a new line.
 184          */
 185         if (pos != NULL && (pos == textdata || *(pos-1) == '\n'))
 186         {
 187               return pos;
 188         }
 189         return NULL;
 190 }
 191
 192 static gboolean pgpinline_is_signed(MimeInfo *mimeinfo)
 193 {
 194         PrivacyDataPGP *data = NULL;
 195         const gchar *sig_indicator = "-----BEGIN PGP SIGNED MESSAGE-----";
 196         gchar *textdata, *sigpos;
 197
 198         cm_return_val_if_fail(mimeinfo != NULL, FALSE);
 199
 200         if (procmime_mimeinfo_parent(mimeinfo) == NULL)
 201                 return FALSE; /* not parent */
 202
 203         if (mimeinfo->type != MIMETYPE_TEXT &&
 204                 (mimeinfo->type != MIMETYPE_APPLICATION ||
 205                  g_ascii_strcasecmp(mimeinfo->subtype, "pgp")))
 206                 return FALSE;
 207
 208         /* Seal the deal. This has to be text/plain through and through. */
 209         if (mimeinfo->type == MIMETYPE_APPLICATION)
 210         {
 211                 mimeinfo->type = MIMETYPE_TEXT;
 212                 g_free(mimeinfo->subtype);
 213                 mimeinfo->subtype = g_strdup("plain");
 214         }
 215
 216         if (mimeinfo->privacy != NULL) {
 217                 data = (PrivacyDataPGP *) mimeinfo->privacy;
 218                 if (data->done_sigtest)
 219                         return data->is_signed;
 220         }
 221
 222         textdata = get_part_as_string(mimeinfo);
 223         if (!textdata)
 224                 return FALSE;
 225
 226         if ((sigpos = strstr(textdata, sig_indicator)) == NULL) {
 227                 g_free(textdata);
 228                 return FALSE;
 229         }
 230
 231         if (!(sigpos == textdata) && !(sigpos[-1] == '\n')) {
 232                 g_free(textdata);
 233                 return FALSE;
 234         }
 235
 236         g_free(textdata);
 237
 238         if (data == NULL) {
 239                 data = pgpinline_new_privacydata();
 240                 mimeinfo->privacy = (PrivacyData *) data;
 241         }
 242         data->done_sigtest = TRUE;
 243         data->is_signed = TRUE;
 244
 245         return TRUE;
 246 }
 247
 248 static gint pgpinline_check_signature(MimeInfo *mimeinfo)
 249 {
 250         PrivacyDataPGP *data = NULL;
 251         gchar *textdata = NULL, *tmp = NULL;
 252         gpgme_data_t plain = NULL, cipher = NULL;
 253         gpgme_error_t err;
 254
 255         cm_return_val_if_fail(mimeinfo != NULL, 0);
 256
 257         if (procmime_mimeinfo_parent(mimeinfo) == NULL) {
 258                 privacy_set_error(_("Incorrect part"));
 259                 return 0; /* not parent */
 260         }
 261         if (mimeinfo->type != MIMETYPE_TEXT) {
 262                 privacy_set_error(_("Not a text part"));
 263                 debug_print("type %d\n", mimeinfo->type);
 264                 return 0;
 265         }
 266         cm_return_val_if_fail(mimeinfo->privacy != NULL, 0);
 267         data = (PrivacyDataPGP *) mimeinfo->privacy;
 268
 269         textdata = get_part_as_string(mimeinfo);
 270
 271         if (!textdata) {
 272                 g_free(textdata);
 273                 privacy_set_error(_("Couldn't get text data."));
 274                 return 0;
 275         }
 276
 277         /* gtk2: convert back from utf8 */
 278         tmp = conv_codeset_strdup(textdata, CS_UTF_8,
 279                         procmime_mimeinfo_get_parameter(mimeinfo, "charset"));
 280         if (!tmp) {
 281                 tmp = conv_codeset_strdup(textdata, CS_UTF_8,
 282                         conv_get_locale_charset_str_no_utf8());
 283         }
 284         if (!tmp) {
 285                 g_warning("Can't convert charset to anything sane\n");
 286                 tmp = conv_codeset_strdup(textdata, CS_UTF_8, CS_US_ASCII);
 287         }
 288         g_free(textdata);
 289
 290         if (!tmp) {
 291                 privacy_set_error(_("Couldn't convert text data to any sane charset."));
 292                 return 0;
 293         }
 294         textdata = g_strdup(tmp);
 295         g_free(tmp);
 296
 297         if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
 298                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 299                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 300                 g_free(textdata);
 301                 return 0;
 302         }
 303         gpgme_set_textmode(data->ctx, 1);
 304         gpgme_set_armor(data->ctx, 1);
 305
 306         gpgme_data_new_from_mem(&plain, textdata, (size_t)strlen(textdata), 1);
 307         gpgme_data_new(&cipher);
 308
 309         data->sigstatus = sgpgme_verify_signature(data->ctx, plain, NULL, cipher);
 310
 311         gpgme_data_release(plain);
 312         gpgme_data_release(cipher);
 313
 314         g_free(textdata);
 315
 316         return 0;
 317 }
 318
 319 static SignatureStatus pgpinline_get_sig_status(MimeInfo *mimeinfo)
 320 {
 321         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 322
 323         cm_return_val_if_fail(data != NULL, SIGNATURE_INVALID);
 324
 325         if (data->sigstatus == NULL &&
 326             prefs_gpg_get_config()->auto_check_signatures)
 327                 pgpinline_check_signature(mimeinfo);
 328
 329         return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
 330 }
 331
 332 static gchar *pgpinline_get_sig_info_short(MimeInfo *mimeinfo)
 333 {
 334         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 335
 336         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 337
 338         if (data->sigstatus == NULL &&
 339             prefs_gpg_get_config()->auto_check_signatures)
 340                 pgpinline_check_signature(mimeinfo);
 341
 342         return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
 343 }
 344
 345 static gchar *pgpinline_get_sig_info_full(MimeInfo *mimeinfo)
 346 {
 347         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 348
 349         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 350
 351         return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
 352 }
 353
 354
 355
 356 static gboolean pgpinline_is_encrypted(MimeInfo *mimeinfo)
 357 {
 358         const gchar *enc_indicator = "-----BEGIN PGP MESSAGE-----";
 359         gchar *textdata;
 360
 361         cm_return_val_if_fail(mimeinfo != NULL, FALSE);
 362
 363         if (procmime_mimeinfo_parent(mimeinfo) == NULL)
 364                 return FALSE; /* not parent */
 365
 366         if (mimeinfo->type != MIMETYPE_TEXT &&
 367                 (mimeinfo->type != MIMETYPE_APPLICATION ||
 368                  g_ascii_strcasecmp(mimeinfo->subtype, "pgp")))
 369                 return FALSE;
 370
 371         /* Seal the deal. This has to be text/plain through and through. */
 372         if (mimeinfo->type == MIMETYPE_APPLICATION)
 373         {
 374                 mimeinfo->type = MIMETYPE_TEXT;
 375                 g_free(mimeinfo->subtype);
 376                 mimeinfo->subtype = g_strdup("plain");
 377         }
 378
 379         textdata = get_part_as_string(mimeinfo);
 380         if (!textdata)
 381                 return FALSE;
 382
 383         if (!pgpinline_locate_armor_header(textdata, enc_indicator)) {
 384                 g_free(textdata);
 385                 return FALSE;
 386         }
 387
 388         g_free(textdata);
 389
 390         return TRUE;
 391 }
 392
 393 static MimeInfo *pgpinline_decrypt(MimeInfo *mimeinfo)
 394 {
 395         MimeInfo *decinfo, *parseinfo;
 396         gpgme_data_t cipher, plain;
 397         FILE *dstfp;
 398         gchar *fname;
 399         gchar *textdata = NULL;
 400         static gint id = 0;
 401         const gchar *src_codeset = NULL;
 402         gpgme_verify_result_t sigstat = 0;
 403         PrivacyDataPGP *data = NULL;
 404         gpgme_ctx_t ctx;
 405         gchar *chars;
 406         size_t len;
 407         const gchar *begin_indicator = "-----BEGIN PGP MESSAGE-----";
 408         const gchar *end_indicator = "-----END PGP MESSAGE-----";
 409         gchar *pos;
 410
 411         if (gpgme_new(&ctx) != GPG_ERR_NO_ERROR)
 412                 return NULL;
 413
 414         gpgme_set_textmode(ctx, 1);
 415         gpgme_set_armor(ctx, 1);
 416
 417         cm_return_val_if_fail(mimeinfo != NULL, NULL);
 418         cm_return_val_if_fail(pgpinline_is_encrypted(mimeinfo), NULL);
 419
 420         if (procmime_mimeinfo_parent(mimeinfo) == NULL ||
 421             mimeinfo->type != MIMETYPE_TEXT) {
 422                 gpgme_release(ctx);
 423                 privacy_set_error(_("Couldn't parse mime part."));
 424                 return NULL;
 425         }
 426
 427         textdata = get_part_as_string(mimeinfo);
 428         if (!textdata) {
 429                 gpgme_release(ctx);
 430                 privacy_set_error(_("Couldn't get text data."));
 431                 return NULL;
 432         }
 433
 434         debug_print("decrypting '%s'\n", textdata);
 435         gpgme_data_new_from_mem(&cipher, textdata, (size_t)strlen(textdata), 1);
 436
 437         plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
 438         if (sigstat && !sigstat->signatures)
 439                 sigstat = NULL;
 440
 441         gpgme_data_release(cipher);
 442
 443         if (plain == NULL) {
 444                 gpgme_release(ctx);
 445                 return NULL;
 446         }
 447
 448         fname = g_strdup_printf("%s%cplaintext.%08x",
 449                 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
 450
 451         if ((dstfp = g_fopen(fname, "wb")) == NULL) {
 452                 FILE_OP_ERROR(fname, "fopen");
 453                 privacy_set_error(_("Couldn't open decrypted file %s"), fname);
 454                 g_free(fname);
 455                 gpgme_data_release(plain);
 456                 gpgme_release(ctx);
 457                 return NULL;
 458         }
 459
 460         src_codeset = procmime_mimeinfo_get_parameter(mimeinfo, "charset");
 461         if (src_codeset == NULL)
 462                 src_codeset = CS_ISO_8859_1;
 463
 464         if (fprintf(dstfp, "MIME-Version: 1.0\r\n"
 465                         "Content-Type: text/plain; charset=%s\r\n"
 466                         "Content-Transfer-Encoding: 8bit\r\n"
 467                         "\r\n",
 468                         src_codeset) < 0) {
 469                 FILE_OP_ERROR(fname, "fprintf");
 470                 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 471                 goto FILE_ERROR;
 472         }
 473
 474         /* Store any part before encrypted text */
 475         pos = pgpinline_locate_armor_header(textdata, begin_indicator);
 476         if (pos != NULL && (pos - textdata) > 0) {
 477             if (fwrite(textdata, 1, pos - textdata, dstfp) < pos - textdata) {
 478                 FILE_OP_ERROR(fname, "fwrite");
 479                 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 480                 goto FILE_ERROR;
 481             }
 482         }
 483
 484         if (fwrite(_("\n--- Start of PGP/Inline encrypted data ---\n"), 1,
 485                 strlen(_("\n--- Start of PGP/Inline encrypted data ---\n")),
 486                 dstfp) < strlen(_("\n--- Start of PGP/Inline encrypted data ---\n"))) {
 487                 FILE_OP_ERROR(fname, "fwrite");
 488                 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 489                 goto FILE_ERROR;
 490         }
 491         chars = sgpgme_data_release_and_get_mem(plain, &len);
 492         if (len > 0) {
 493                 if (fwrite(chars, 1, len, dstfp) < len) {
 494                         FILE_OP_ERROR(fname, "fwrite");
 495                         g_free(chars);
 496                         privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 497                         goto FILE_ERROR;
 498                 }
 499         }
 500         g_free(chars);
 501         /* Store any part after encrypted text */
 502         if (fwrite(_("--- End of PGP/Inline encrypted data ---\n"), 1,
 503                 strlen(_("--- End of PGP/Inline encrypted data ---\n")),
 504                 dstfp) < strlen(_("--- End of PGP/Inline encrypted data ---\n"))) {
 505                         FILE_OP_ERROR(fname, "fwrite");
 506                         privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 507                         goto FILE_ERROR;
 508         }
 509         if (pos != NULL) {
 510             pos = pgpinline_locate_armor_header(pos, end_indicator);
 511             if (pos != NULL && *pos != '\0') {
 512                 pos += strlen(end_indicator);
 513                 if (fwrite(pos, 1, strlen(pos), dstfp) < strlen(pos)) {
 514                         FILE_OP_ERROR(fname, "fwrite");
 515                         privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 516                         goto FILE_ERROR;
 517                 }
 518             }
 519         }
 520
 521         if (fclose(dstfp) == EOF) {
 522                 FILE_OP_ERROR(fname, "fclose");
 523                 privacy_set_error(_("Couldn't close decrypted file %s"), fname);
 524                 g_free(fname);
 525                 gpgme_data_release(plain);
 526                 gpgme_release(ctx);
 527                 return NULL;
 528         }
 529
 530         parseinfo = procmime_scan_file(fname);
 531         g_free(fname);
 532
 533         if (parseinfo == NULL) {
 534                 gpgme_release(ctx);
 535                 privacy_set_error(_("Couldn't scan decrypted file."));
 536                 return NULL;
 537         }
 538         decinfo = g_node_first_child(parseinfo->node) != NULL ?
 539                 g_node_first_child(parseinfo->node)->data : NULL;
 540
 541         if (decinfo == NULL) {
 542                 gpgme_release(ctx);
 543                 privacy_set_error(_("Couldn't scan decrypted file parts."));
 544                 return NULL;
 545         }
 546
 547         g_node_unlink(decinfo->node);
 548         procmime_mimeinfo_free_all(parseinfo);
 549
 550         decinfo->tmp = TRUE;
 551
 552         if (sigstat != GPGME_SIG_STAT_NONE) {
 553                 if (decinfo->privacy != NULL) {
 554                         data = (PrivacyDataPGP *) decinfo->privacy;
 555                 } else {
 556                         data = pgpinline_new_privacydata();
 557                         decinfo->privacy = (PrivacyData *) data;
 558                 }
 559                 data->done_sigtest = TRUE;
 560                 data->is_signed = TRUE;
 561                 data->sigstatus = sigstat;
 562                 if (data->ctx)
 563                         gpgme_release(data->ctx);
 564                 data->ctx = ctx;
 565         } else
 566                 gpgme_release(ctx);
 567
 568         return decinfo;
 569
 570 FILE_ERROR:
 571         fclose(dstfp);
 572         g_free(fname);
 573         gpgme_data_release(plain);
 574         gpgme_release(ctx);
 575         return NULL;
 576 }
 577
 578 static gboolean pgpinline_sign(MimeInfo *mimeinfo, PrefsAccount *account, const gchar *from_addr)
 579 {
 580         MimeInfo *msgcontent;
 581         gchar *textstr, *tmp;
 582         FILE *fp;
 583         gchar *sigcontent;
 584         gpgme_ctx_t ctx;
 585         gpgme_data_t gpgtext, gpgsig;
 586         size_t len;
 587         gpgme_error_t err;
 588         struct passphrase_cb_info_s info;
 589         gpgme_sign_result_t result = NULL;
 590
 591         memset (&info, 0, sizeof info);
 592
 593         /* get content node from message */
 594         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 595         if (msgcontent->type == MIMETYPE_MULTIPART) {
 596                 if (!msgcontent->node->children) {
 597                         debug_print("msgcontent->node->children NULL, bailing\n");
 598                         privacy_set_error(_("Malformed message"));
 599                         return FALSE;
 600                 }
 601                 msgcontent = (MimeInfo *) msgcontent->node->children->data;
 602         }
 603         /* get rid of quoted-printable or anything */
 604         procmime_decode_content(msgcontent);
 605
 606         fp = my_tmpfile();
 607         if (fp == NULL) {
 608                 perror("my_tmpfile");
 609                 privacy_set_error(_("Couldn't create temporary file."));
 610                 return FALSE;
 611         }
 612         procmime_write_mimeinfo(msgcontent, fp);
 613         rewind(fp);
 614
 615         /* read temporary file into memory */
 616         textstr = fp_read_noconv(fp);
 617
 618         fclose(fp);
 619
 620         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 621         gpgme_data_new(&gpgsig);
 622         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 623                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 624                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 625                 return FALSE;
 626         }
 627         gpgme_set_textmode(ctx, 1);
 628         gpgme_set_armor(ctx, 1);
 629
 630         if (!sgpgme_setup_signers(ctx, account, from_addr)) {
 631                 gpgme_release(ctx);
 632                 return FALSE;
 633         }
 634
 635         prefs_gpg_enable_agent(prefs_gpg_get_config()->use_gpg_agent);
 636         if (!getenv("GPG_AGENT_INFO") || !prefs_gpg_get_config()->use_gpg_agent) {
 637                 info.c = ctx;
 638                 gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
 639         }
 640
 641         err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_CLEAR);
 642         if (err != GPG_ERR_NO_ERROR) {
 643                 if (err == GPG_ERR_CANCELED) {
 644                         /* ignore cancelled signing */
 645                         privacy_reset_error();
 646                         debug_print("gpgme_op_sign cancelled\n");
 647                 } else {
 648                         privacy_set_error(_("Data signing failed, %s"), gpgme_strerror(err));
 649                         debug_print("gpgme_op_sign error : %x\n", err);
 650                 }
 651                 gpgme_release(ctx);
 652                 return FALSE;
 653         }
 654         result = gpgme_op_sign_result(ctx);
 655         if (result && result->signatures) {
 656                 gpgme_new_signature_t sig = result->signatures;
 657                 while (sig) {
 658                         debug_print("valid signature: %s\n", sig->fpr);
 659                         sig = sig->next;
 660                 }
 661         } else if (result && result->invalid_signers) {
 662                 gpgme_invalid_key_t invalid = result->invalid_signers;
 663                 while (invalid) {
 664                         g_warning("invalid signer: %s (%s)", invalid->fpr,
 665                                 gpgme_strerror(invalid->reason));
 666                         privacy_set_error(_("Data signing failed due to invalid signer: %s"),
 667                                 gpgme_strerror(invalid->reason));
 668                         invalid = invalid->next;
 669                 }
 670                 gpgme_release(ctx);
 671                 return FALSE;
 672         } else {
 673                 /* can't get result (maybe no signing key?) */
 674                 debug_print("gpgme_op_sign_result error\n");
 675                 privacy_set_error(_("Data signing failed, no results."));
 676                 gpgme_release(ctx);
 677                 return FALSE;
 678         }
 679
 680
 681         sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
 682
 683         if (sigcontent == NULL || len <= 0) {
 684                 g_warning("sgpgme_data_release_and_get_mem failed");
 685                 privacy_set_error(_("Data signing failed, no contents."));
 686                 gpgme_data_release(gpgtext);
 687                 g_free(textstr);
 688                 g_free(sigcontent);
 689                 gpgme_release(ctx);
 690                 return FALSE;
 691         }
 692
 693         tmp = g_malloc(len+1);
 694         g_memmove(tmp, sigcontent, len+1);
 695         tmp[len] = '\0';
 696         gpgme_data_release(gpgtext);
 697         g_free(textstr);
 698         g_free(sigcontent);
 699
 700         if (msgcontent->content == MIMECONTENT_FILE &&
 701             msgcontent->data.filename != NULL) {
 702                 if (msgcontent->tmp == TRUE)
 703                         claws_unlink(msgcontent->data.filename);
 704                 g_free(msgcontent->data.filename);
 705         }
 706         msgcontent->data.mem = g_strdup(tmp);
 707         msgcontent->content = MIMECONTENT_MEM;
 708         g_free(tmp);
 709
 710         /* avoid all sorts of clear-signing problems with non ascii
 711          * chars
 712          */
 713         procmime_encode_content(msgcontent, ENC_BASE64);
 714         gpgme_release(ctx);
 715
 716         return TRUE;
 717 }
 718
 719 static gchar *pgpinline_get_encrypt_data(GSList *recp_names)
 720 {
 721         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_OpenPGP);
 722 }
 723
 724 static const gchar *pgpinline_get_encrypt_warning(void)
 725 {
 726         if (prefs_gpg_should_skip_encryption_warning(pgpinline_system.id))
 727                 return NULL;
 728         else
 729                 return _("Please note that attachments are not encrypted by "
 730                  "the PGP/Inline system, nor are email headers, like Subject.");
 731 }
 732
 733 static void pgpinline_inhibit_encrypt_warning(gboolean inhibit)
 734 {
 735         if (inhibit)
 736                 prefs_gpg_add_skip_encryption_warning(pgpinline_system.id);
 737         else
 738                 prefs_gpg_remove_skip_encryption_warning(pgpinline_system.id);
 739 }
 740
 741 static gboolean pgpinline_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
 742 {
 743         MimeInfo *msgcontent;
 744         FILE *fp;
 745         gchar *enccontent;
 746         size_t len;
 747         gchar *textstr, *tmp;
 748         gpgme_data_t gpgtext, gpgenc;
 749         gpgme_ctx_t ctx;
 750         gpgme_key_t *kset = NULL;
 751         gchar **fprs = g_strsplit(encrypt_data, " ", -1);
 752         gpgme_error_t err;
 753         gint i = 0;
 754
 755         while (fprs[i] && strlen(fprs[i])) {
 756                 i++;
 757         }
 758
 759         kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
 760         memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
 761         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 762                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 763                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 764                 g_free(kset);
 765                 return FALSE;
 766         }
 767         i = 0;
 768         while (fprs[i] && strlen(fprs[i])) {
 769                 gpgme_key_t key;
 770                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
 771                 if (err) {
 772                         debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
 773                         privacy_set_error(_("Couldn't add GPG key %s, %s"), fprs[i], gpgme_strerror(err));
 774                         g_free(kset);
 775                         return FALSE;
 776                 }
 777                 debug_print("found %s at %d\n", fprs[i], i);
 778                 kset[i] = key;
 779                 i++;
 780         }
 781
 782
 783         debug_print("Encrypting message content\n");
 784
 785         /* get content node from message */
 786         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 787         if (msgcontent->type == MIMETYPE_MULTIPART) {
 788                 if (!msgcontent->node->children) {
 789                         debug_print("msgcontent->node->children NULL, bailing\n");
 790                         privacy_set_error(_("Malformed message"));
 791                         g_free(kset);
 792                         return FALSE;
 793                 }
 794                 msgcontent = (MimeInfo *) msgcontent->node->children->data;
 795         }
 796         /* get rid of quoted-printable or anything */
 797         procmime_decode_content(msgcontent);
 798
 799         fp = my_tmpfile();
 800         if (fp == NULL) {
 801                 privacy_set_error(_("Couldn't create temporary file, %s"), strerror(errno));
 802                 perror("my_tmpfile");
 803                 g_free(kset);
 804                 return FALSE;
 805         }
 806         procmime_write_mimeinfo(msgcontent, fp);
 807         rewind(fp);
 808
 809         /* read temporary file into memory */
 810         textstr = fp_read_noconv(fp);
 811
 812         fclose(fp);
 813
 814         /* encrypt data */
 815         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 816         gpgme_data_new(&gpgenc);
 817         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 818                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 819                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 820                 g_free(kset);
 821                 return FALSE;
 822         }
 823         gpgme_set_armor(ctx, 1);
 824
 825         err = gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
 826
 827         enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
 828         g_free(kset);
 829
 830         if (enccontent == NULL || len <= 0) {
 831                 g_warning("sgpgme_data_release_and_get_mem failed");
 832                 privacy_set_error(_("Encryption failed, %s"), gpgme_strerror(err));
 833                 gpgme_data_release(gpgtext);
 834                 g_free(textstr);
 835                 gpgme_release(ctx);
 836                 return FALSE;
 837         }
 838
 839         tmp = g_malloc(len+1);
 840         g_memmove(tmp, enccontent, len+1);
 841         tmp[len] = '\0';
 842         g_free(enccontent);
 843
 844         gpgme_data_release(gpgtext);
 845         g_free(textstr);
 846
 847         if (msgcontent->content == MIMECONTENT_FILE &&
 848             msgcontent->data.filename != NULL) {
 849                 if (msgcontent->tmp == TRUE)
 850                         claws_unlink(msgcontent->data.filename);
 851                 g_free(msgcontent->data.filename);
 852         }
 853         msgcontent->data.mem = g_strdup(tmp);
 854         msgcontent->content = MIMECONTENT_MEM;
 855         g_free(tmp);
 856         gpgme_release(ctx);
 857
 858         return TRUE;
 859 }
 860
 861 static PrivacySystem pgpinline_system = {
 862         "pgpinline",                    /* id */
 863         "PGP Inline",                   /* name */
 864
 865         pgpinline_free_privacydata,     /* free_privacydata */
 866
 867         pgpinline_is_signed,            /* is_signed(MimeInfo *) */
 868         pgpinline_check_signature,      /* check_signature(MimeInfo *) */
 869         pgpinline_get_sig_status,       /* get_sig_status(MimeInfo *) */
 870         pgpinline_get_sig_info_short,   /* get_sig_info_short(MimeInfo *) */
 871         pgpinline_get_sig_info_full,    /* get_sig_info_full(MimeInfo *) */
 872
 873         pgpinline_is_encrypted,         /* is_encrypted(MimeInfo *) */
 874         pgpinline_decrypt,              /* decrypt(MimeInfo *) */
 875
 876         TRUE,
 877         pgpinline_sign,
 878
 879         TRUE,
 880         pgpinline_get_encrypt_data,
 881         pgpinline_encrypt,
 882         pgpinline_get_encrypt_warning,
 883         pgpinline_inhibit_encrypt_warning,
 884 };
 885
 886 void pgpinline_init()
 887 {
 888         privacy_register_system(&pgpinline_system);
 889 }
 890
 891 void pgpinline_done()
 892 {
 893         privacy_unregister_system(&pgpinline_system);
 894 }
 895
 896 struct PluginFeature *plugin_provides(void)
 897 {
 898         static struct PluginFeature features[] =
 899                 { {PLUGIN_PRIVACY, N_("PGP/Inline")},
 900                   {PLUGIN_NOTHING, NULL}};
 901         return features;
 902 }
 903 #endif /* USE_GPGME */