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