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