src/plugins/pgpinline/pgpinline.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2014 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         if (data != NULL) {
 141                 data->done_sigtest = TRUE;
 142                 data->is_signed = TRUE;
 143         }
 144
 145         return TRUE;
 146 }
 147
 148 static gint pgpinline_check_signature(MimeInfo *mimeinfo)
 149 {
 150         PrivacyDataPGP *data = NULL;
 151         gchar *textdata = NULL, *tmp = NULL;
 152         gpgme_data_t plain = NULL, cipher = NULL;
 153         gpgme_error_t err;
 154
 155         cm_return_val_if_fail(mimeinfo != NULL, 0);
 156
 157         if (procmime_mimeinfo_parent(mimeinfo) == NULL) {
 158                 privacy_set_error(_("Incorrect part"));
 159                 return 0; /* not parent */
 160         }
 161         if (mimeinfo->type != MIMETYPE_TEXT) {
 162                 privacy_set_error(_("Not a text part"));
 163                 debug_print("type %d\n", mimeinfo->type);
 164                 return 0;
 165         }
 166         cm_return_val_if_fail(mimeinfo->privacy != NULL, 0);
 167         data = (PrivacyDataPGP *) mimeinfo->privacy;
 168
 169         textdata = get_part_as_string(mimeinfo);
 170
 171         if (!textdata) {
 172                 g_free(textdata);
 173                 privacy_set_error(_("Couldn't get text data."));
 174                 return 0;
 175         }
 176
 177         /* gtk2: convert back from utf8 */
 178         tmp = conv_codeset_strdup(textdata, CS_UTF_8,
 179                         procmime_mimeinfo_get_parameter(mimeinfo, "charset"));
 180         if (!tmp) {
 181                 tmp = conv_codeset_strdup(textdata, CS_UTF_8,
 182                         conv_get_locale_charset_str_no_utf8());
 183         }
 184         if (!tmp) {
 185                 g_warning("Can't convert charset to anything sane\n");
 186                 tmp = conv_codeset_strdup(textdata, CS_UTF_8, CS_US_ASCII);
 187         }
 188         g_free(textdata);
 189
 190         if (!tmp) {
 191                 privacy_set_error(_("Couldn't convert text data to any sane charset."));
 192                 return 0;
 193         }
 194         textdata = g_strdup(tmp);
 195         g_free(tmp);
 196
 197         if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
 198                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 199                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 200                 g_free(textdata);
 201                 return 0;
 202         }
 203         gpgme_set_textmode(data->ctx, 1);
 204         gpgme_set_armor(data->ctx, 1);
 205
 206         gpgme_data_new_from_mem(&plain, textdata, (size_t)strlen(textdata), 1);
 207         gpgme_data_new(&cipher);
 208
 209         data->sigstatus = sgpgme_verify_signature(data->ctx, plain, NULL, cipher);
 210
 211         gpgme_data_release(plain);
 212         gpgme_data_release(cipher);
 213
 214         g_free(textdata);
 215
 216         return 0;
 217 }
 218
 219 static SignatureStatus pgpinline_get_sig_status(MimeInfo *mimeinfo)
 220 {
 221         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 222
 223         cm_return_val_if_fail(data != NULL, SIGNATURE_INVALID);
 224
 225         return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
 226 }
 227
 228 static gchar *pgpinline_get_sig_info_short(MimeInfo *mimeinfo)
 229 {
 230         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 231
 232         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 233
 234         return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
 235 }
 236
 237 static gchar *pgpinline_get_sig_info_full(MimeInfo *mimeinfo)
 238 {
 239         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 240
 241         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 242
 243         return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
 244 }
 245
 246 static gboolean pgpinline_is_encrypted(MimeInfo *mimeinfo)
 247 {
 248         const gchar *begin_indicator = "-----BEGIN PGP MESSAGE-----";
 249         const gchar *end_indicator = "-----END PGP MESSAGE-----";
 250         gchar *textdata;
 251
 252         cm_return_val_if_fail(mimeinfo != NULL, FALSE);
 253
 254         if (procmime_mimeinfo_parent(mimeinfo) == NULL)
 255                 return FALSE; /* not parent */
 256
 257         if (mimeinfo->type != MIMETYPE_TEXT &&
 258                 (mimeinfo->type != MIMETYPE_APPLICATION ||
 259                  g_ascii_strcasecmp(mimeinfo->subtype, "pgp")))
 260                 return FALSE;
 261
 262         /* Seal the deal. This has to be text/plain through and through. */
 263         if (mimeinfo->type == MIMETYPE_APPLICATION)
 264         {
 265                 mimeinfo->type = MIMETYPE_TEXT;
 266                 g_free(mimeinfo->subtype);
 267                 mimeinfo->subtype = g_strdup("plain");
 268         }
 269
 270         textdata = get_part_as_string(mimeinfo);
 271         if (!textdata)
 272                 return FALSE;
 273
 274         if (!pgp_locate_armor_header(textdata, begin_indicator)) {
 275                 g_free(textdata);
 276                 return FALSE;
 277         }
 278         if (!pgp_locate_armor_header(textdata, end_indicator)) {
 279                 g_free(textdata);
 280                 return FALSE;
 281         }
 282
 283         g_free(textdata);
 284
 285         return TRUE;
 286 }
 287
 288 static MimeInfo *pgpinline_decrypt(MimeInfo *mimeinfo)
 289 {
 290         MimeInfo *decinfo, *parseinfo;
 291         gpgme_data_t cipher, plain;
 292         FILE *dstfp;
 293         gchar *fname;
 294         gchar *textdata = NULL;
 295         static gint id = 0;
 296         const gchar *src_codeset = NULL;
 297         gpgme_verify_result_t sigstat = 0;
 298         PrivacyDataPGP *data = NULL;
 299         gpgme_ctx_t ctx;
 300         gchar *chars;
 301         size_t len;
 302         const gchar *begin_indicator = "-----BEGIN PGP MESSAGE-----";
 303         const gchar *end_indicator = "-----END PGP MESSAGE-----";
 304         gchar *pos;
 305
 306         if (gpgme_new(&ctx) != GPG_ERR_NO_ERROR)
 307                 return NULL;
 308
 309         gpgme_set_textmode(ctx, 1);
 310         gpgme_set_armor(ctx, 1);
 311
 312         cm_return_val_if_fail(mimeinfo != NULL, NULL);
 313         cm_return_val_if_fail(pgpinline_is_encrypted(mimeinfo), NULL);
 314
 315         if (procmime_mimeinfo_parent(mimeinfo) == NULL ||
 316             mimeinfo->type != MIMETYPE_TEXT) {
 317                 gpgme_release(ctx);
 318                 privacy_set_error(_("Couldn't parse mime part."));
 319                 return NULL;
 320         }
 321
 322         textdata = get_part_as_string(mimeinfo);
 323         if (!textdata) {
 324                 gpgme_release(ctx);
 325                 privacy_set_error(_("Couldn't get text data."));
 326                 return NULL;
 327         }
 328
 329         debug_print("decrypting '%s'\n", textdata);
 330         gpgme_data_new_from_mem(&cipher, textdata, (size_t)strlen(textdata), 1);
 331
 332         plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
 333         if (sigstat && !sigstat->signatures)
 334                 sigstat = NULL;
 335
 336         gpgme_data_release(cipher);
 337
 338         if (plain == NULL) {
 339                 gpgme_release(ctx);
 340                 return NULL;
 341         }
 342
 343         fname = g_strdup_printf("%s%cplaintext.%08x",
 344                 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
 345
 346         if ((dstfp = g_fopen(fname, "wb")) == NULL) {
 347                 FILE_OP_ERROR(fname, "fopen");
 348                 privacy_set_error(_("Couldn't open decrypted file %s"), fname);
 349                 g_free(fname);
 350                 gpgme_data_release(plain);
 351                 gpgme_release(ctx);
 352                 return NULL;
 353         }
 354
 355         src_codeset = procmime_mimeinfo_get_parameter(mimeinfo, "charset");
 356         if (src_codeset == NULL)
 357                 src_codeset = CS_ISO_8859_1;
 358
 359         if (fprintf(dstfp, "MIME-Version: 1.0\r\n"
 360                         "Content-Type: text/plain; charset=%s\r\n"
 361                         "Content-Transfer-Encoding: 8bit\r\n"
 362                         "\r\n",
 363                         src_codeset) < 0) {
 364                 FILE_OP_ERROR(fname, "fprintf");
 365                 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 366                 goto FILE_ERROR;
 367         }
 368
 369         /* Store any part before encrypted text */
 370         pos = pgp_locate_armor_header(textdata, begin_indicator);
 371         if (pos != NULL && (pos - textdata) > 0) {
 372             if (fwrite(textdata, 1, pos - textdata, dstfp) < pos - textdata) {
 373                 FILE_OP_ERROR(fname, "fwrite");
 374                 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 375                 goto FILE_ERROR;
 376             }
 377         }
 378
 379         if (fwrite(_("\n--- Start of PGP/Inline encrypted data ---\n"), 1,
 380                 strlen(_("\n--- Start of PGP/Inline encrypted data ---\n")),
 381                 dstfp) < strlen(_("\n--- Start of PGP/Inline encrypted data ---\n"))) {
 382                 FILE_OP_ERROR(fname, "fwrite");
 383                 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 384                 goto FILE_ERROR;
 385         }
 386         chars = sgpgme_data_release_and_get_mem(plain, &len);
 387         if (len > 0) {
 388                 if (fwrite(chars, 1, len, dstfp) < len) {
 389                         FILE_OP_ERROR(fname, "fwrite");
 390                         g_free(chars);
 391                         privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 392                         goto FILE_ERROR;
 393                 }
 394         }
 395         g_free(chars);
 396         /* Store any part after encrypted text */
 397         if (fwrite(_("--- End of PGP/Inline encrypted data ---\n"), 1,
 398                 strlen(_("--- End of PGP/Inline encrypted data ---\n")),
 399                 dstfp) < strlen(_("--- End of PGP/Inline encrypted data ---\n"))) {
 400                         FILE_OP_ERROR(fname, "fwrite");
 401                         privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 402                         goto FILE_ERROR;
 403         }
 404         if (pos != NULL) {
 405             pos = pgp_locate_armor_header(pos, end_indicator);
 406             if (pos != NULL && *pos != '\0') {
 407                 pos += strlen(end_indicator);
 408                 if (fwrite(pos, 1, strlen(pos), dstfp) < strlen(pos)) {
 409                         FILE_OP_ERROR(fname, "fwrite");
 410                         privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 411                         goto FILE_ERROR;
 412                 }
 413             }
 414         }
 415
 416         if (fclose(dstfp) == EOF) {
 417                 FILE_OP_ERROR(fname, "fclose");
 418                 privacy_set_error(_("Couldn't close decrypted file %s"), fname);
 419                 g_free(fname);
 420                 gpgme_data_release(plain);
 421                 gpgme_release(ctx);
 422                 return NULL;
 423         }
 424
 425         parseinfo = procmime_scan_file(fname);
 426         g_free(fname);
 427
 428         if (parseinfo == NULL) {
 429                 gpgme_release(ctx);
 430                 privacy_set_error(_("Couldn't scan decrypted file."));
 431                 return NULL;
 432         }
 433         decinfo = g_node_first_child(parseinfo->node) != NULL ?
 434                 g_node_first_child(parseinfo->node)->data : NULL;
 435
 436         if (decinfo == NULL) {
 437                 gpgme_release(ctx);
 438                 privacy_set_error(_("Couldn't scan decrypted file parts."));
 439                 return NULL;
 440         }
 441
 442         g_node_unlink(decinfo->node);
 443         procmime_mimeinfo_free_all(parseinfo);
 444
 445         decinfo->tmp = TRUE;
 446
 447         if (sigstat != GPGME_SIG_STAT_NONE) {
 448                 if (decinfo->privacy != NULL) {
 449                         data = (PrivacyDataPGP *) decinfo->privacy;
 450                 } else {
 451                         data = pgpinline_new_privacydata();
 452                         decinfo->privacy = (PrivacyData *) data;
 453                 }
 454                 if (data != NULL) {
 455                         data->done_sigtest = TRUE;
 456                         data->is_signed = TRUE;
 457                         data->sigstatus = sigstat;
 458                         if (data->ctx)
 459                                 gpgme_release(data->ctx);
 460                         data->ctx = ctx;
 461                 }
 462         } else
 463                 gpgme_release(ctx);
 464
 465         return decinfo;
 466
 467 FILE_ERROR:
 468         fclose(dstfp);
 469         g_free(fname);
 470         gpgme_data_release(plain);
 471         gpgme_release(ctx);
 472         return NULL;
 473 }
 474
 475 static gboolean pgpinline_sign(MimeInfo *mimeinfo, PrefsAccount *account, const gchar *from_addr)
 476 {
 477         MimeInfo *msgcontent;
 478         gchar *textstr, *tmp;
 479         FILE *fp;
 480         gchar *sigcontent;
 481         gpgme_ctx_t ctx;
 482         gpgme_data_t gpgtext, gpgsig;
 483         size_t len;
 484         gpgme_error_t err;
 485         struct passphrase_cb_info_s info;
 486         gpgme_sign_result_t result = NULL;
 487
 488         memset (&info, 0, sizeof info);
 489
 490         /* get content node from message */
 491         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 492         if (msgcontent->type == MIMETYPE_MULTIPART) {
 493                 if (!msgcontent->node->children) {
 494                         debug_print("msgcontent->node->children NULL, bailing\n");
 495                         privacy_set_error(_("Malformed message"));
 496                         return FALSE;
 497                 }
 498                 msgcontent = (MimeInfo *) msgcontent->node->children->data;
 499         }
 500         /* get rid of quoted-printable or anything */
 501         procmime_decode_content(msgcontent);
 502
 503         fp = my_tmpfile();
 504         if (fp == NULL) {
 505                 perror("my_tmpfile");
 506                 privacy_set_error(_("Couldn't create temporary file."));
 507                 return FALSE;
 508         }
 509         procmime_write_mimeinfo(msgcontent, fp);
 510         rewind(fp);
 511
 512         /* read temporary file into memory */
 513         textstr = fp_read_noconv(fp);
 514
 515         fclose(fp);
 516
 517         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 518         gpgme_data_new(&gpgsig);
 519         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 520                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 521                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 522                 return FALSE;
 523         }
 524         gpgme_set_textmode(ctx, 1);
 525         gpgme_set_armor(ctx, 1);
 526
 527         if (!sgpgme_setup_signers(ctx, account, from_addr)) {
 528                 gpgme_release(ctx);
 529                 return FALSE;
 530         }
 531
 532         prefs_gpg_enable_agent(prefs_gpg_get_config()->use_gpg_agent);
 533         if (!getenv("GPG_AGENT_INFO") || !prefs_gpg_get_config()->use_gpg_agent) {
 534                 info.c = ctx;
 535                 gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
 536         }
 537
 538         err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_CLEAR);
 539         if (err != GPG_ERR_NO_ERROR) {
 540                 if (err == GPG_ERR_CANCELED) {
 541                         /* ignore cancelled signing */
 542                         privacy_reset_error();
 543                         debug_print("gpgme_op_sign cancelled\n");
 544                 } else {
 545                         privacy_set_error(_("Data signing failed, %s"), gpgme_strerror(err));
 546                         debug_print("gpgme_op_sign error : %x\n", err);
 547                 }
 548                 gpgme_release(ctx);
 549                 return FALSE;
 550         }
 551         result = gpgme_op_sign_result(ctx);
 552         if (result && result->signatures) {
 553                 gpgme_new_signature_t sig = result->signatures;
 554                 while (sig) {
 555                         debug_print("valid signature: %s\n", sig->fpr);
 556                         sig = sig->next;
 557                 }
 558         } else if (result && result->invalid_signers) {
 559                 gpgme_invalid_key_t invalid = result->invalid_signers;
 560                 while (invalid) {
 561                         g_warning("invalid signer: %s (%s)", invalid->fpr,
 562                                 gpgme_strerror(invalid->reason));
 563                         privacy_set_error(_("Data signing failed due to invalid signer: %s"),
 564                                 gpgme_strerror(invalid->reason));
 565                         invalid = invalid->next;
 566                 }
 567                 gpgme_release(ctx);
 568                 return FALSE;
 569         } else {
 570                 /* can't get result (maybe no signing key?) */
 571                 debug_print("gpgme_op_sign_result error\n");
 572                 privacy_set_error(_("Data signing failed, no results."));
 573                 gpgme_release(ctx);
 574                 return FALSE;
 575         }
 576
 577
 578         sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
 579
 580         if (sigcontent == NULL || len <= 0) {
 581                 g_warning("sgpgme_data_release_and_get_mem failed");
 582                 privacy_set_error(_("Data signing failed, no contents."));
 583                 gpgme_data_release(gpgtext);
 584                 g_free(textstr);
 585                 g_free(sigcontent);
 586                 gpgme_release(ctx);
 587                 return FALSE;
 588         }
 589
 590         tmp = g_malloc(len+1);
 591         g_memmove(tmp, sigcontent, len+1);
 592         tmp[len] = '\0';
 593         gpgme_data_release(gpgtext);
 594         g_free(textstr);
 595         g_free(sigcontent);
 596
 597         if (msgcontent->content == MIMECONTENT_FILE &&
 598             msgcontent->data.filename != NULL) {
 599                 if (msgcontent->tmp == TRUE)
 600                         claws_unlink(msgcontent->data.filename);
 601                 g_free(msgcontent->data.filename);
 602         }
 603         msgcontent->data.mem = g_strdup(tmp);
 604         msgcontent->content = MIMECONTENT_MEM;
 605         g_free(tmp);
 606
 607         /* avoid all sorts of clear-signing problems with non ascii
 608          * chars
 609          */
 610         procmime_encode_content(msgcontent, ENC_BASE64);
 611         gpgme_release(ctx);
 612
 613         return TRUE;
 614 }
 615
 616 static gchar *pgpinline_get_encrypt_data(GSList *recp_names)
 617 {
 618         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_OpenPGP);
 619 }
 620
 621 static const gchar *pgpinline_get_encrypt_warning(void)
 622 {
 623         if (prefs_gpg_should_skip_encryption_warning(pgpinline_system.id))
 624                 return NULL;
 625         else
 626                 return _("Please note that attachments are not encrypted by "
 627                  "the PGP/Inline system, nor are email headers, like Subject.");
 628 }
 629
 630 static void pgpinline_inhibit_encrypt_warning(gboolean inhibit)
 631 {
 632         if (inhibit)
 633                 prefs_gpg_add_skip_encryption_warning(pgpinline_system.id);
 634         else
 635                 prefs_gpg_remove_skip_encryption_warning(pgpinline_system.id);
 636 }
 637
 638 static gboolean pgpinline_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
 639 {
 640         MimeInfo *msgcontent;
 641         FILE *fp;
 642         gchar *enccontent;
 643         size_t len;
 644         gchar *textstr, *tmp;
 645         gpgme_data_t gpgtext, gpgenc;
 646         gpgme_ctx_t ctx;
 647         gpgme_key_t *kset = NULL;
 648         gchar **fprs = g_strsplit(encrypt_data, " ", -1);
 649         gpgme_error_t err;
 650         gint i = 0;
 651
 652         while (fprs[i] && strlen(fprs[i])) {
 653                 i++;
 654         }
 655
 656         kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
 657         memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
 658         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 659                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 660                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 661                 g_free(kset);
 662                 return FALSE;
 663         }
 664         i = 0;
 665         while (fprs[i] && strlen(fprs[i])) {
 666                 gpgme_key_t key;
 667                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
 668                 if (err) {
 669                         debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
 670                         privacy_set_error(_("Couldn't add GPG key %s, %s"), fprs[i], gpgme_strerror(err));
 671                         g_free(kset);
 672                         return FALSE;
 673                 }
 674                 debug_print("found %s at %d\n", fprs[i], i);
 675                 kset[i] = key;
 676                 i++;
 677         }
 678
 679
 680         debug_print("Encrypting message content\n");
 681
 682         /* get content node from message */
 683         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 684         if (msgcontent->type == MIMETYPE_MULTIPART) {
 685                 if (!msgcontent->node->children) {
 686                         debug_print("msgcontent->node->children NULL, bailing\n");
 687                         privacy_set_error(_("Malformed message"));
 688                         g_free(kset);
 689                         return FALSE;
 690                 }
 691                 msgcontent = (MimeInfo *) msgcontent->node->children->data;
 692         }
 693         /* get rid of quoted-printable or anything */
 694         procmime_decode_content(msgcontent);
 695
 696         fp = my_tmpfile();
 697         if (fp == NULL) {
 698                 privacy_set_error(_("Couldn't create temporary file, %s"), strerror(errno));
 699                 perror("my_tmpfile");
 700                 g_free(kset);
 701                 return FALSE;
 702         }
 703         procmime_write_mimeinfo(msgcontent, fp);
 704         rewind(fp);
 705
 706         /* read temporary file into memory */
 707         textstr = fp_read_noconv(fp);
 708
 709         fclose(fp);
 710
 711         /* encrypt data */
 712         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 713         gpgme_data_new(&gpgenc);
 714         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 715                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 716                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 717                 g_free(kset);
 718                 return FALSE;
 719         }
 720         gpgme_set_armor(ctx, 1);
 721
 722         err = gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
 723
 724         enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
 725         g_free(kset);
 726
 727         if (enccontent == NULL || len <= 0) {
 728                 g_warning("sgpgme_data_release_and_get_mem failed");
 729                 privacy_set_error(_("Encryption failed, %s"), gpgme_strerror(err));
 730                 gpgme_data_release(gpgtext);
 731                 g_free(textstr);
 732                 gpgme_release(ctx);
 733                 g_free(enccontent);
 734                 return FALSE;
 735         }
 736
 737         tmp = g_malloc(len+1);
 738         g_memmove(tmp, enccontent, len+1);
 739         tmp[len] = '\0';
 740         g_free(enccontent);
 741
 742         gpgme_data_release(gpgtext);
 743         g_free(textstr);
 744
 745         if (msgcontent->content == MIMECONTENT_FILE &&
 746             msgcontent->data.filename != NULL) {
 747                 if (msgcontent->tmp == TRUE)
 748                         claws_unlink(msgcontent->data.filename);
 749                 g_free(msgcontent->data.filename);
 750         }
 751         msgcontent->data.mem = g_strdup(tmp);
 752         msgcontent->content = MIMECONTENT_MEM;
 753         g_free(tmp);
 754         gpgme_release(ctx);
 755
 756         return TRUE;
 757 }
 758
 759 static PrivacySystem pgpinline_system = {
 760         "pgpinline",                    /* id */
 761         "PGP Inline",                   /* name */
 762
 763         pgpinline_free_privacydata,     /* free_privacydata */
 764
 765         pgpinline_is_signed,            /* is_signed(MimeInfo *) */
 766         pgpinline_check_signature,      /* check_signature(MimeInfo *) */
 767         pgpinline_get_sig_status,       /* get_sig_status(MimeInfo *) */
 768         pgpinline_get_sig_info_short,   /* get_sig_info_short(MimeInfo *) */
 769         pgpinline_get_sig_info_full,    /* get_sig_info_full(MimeInfo *) */
 770
 771         pgpinline_is_encrypted,         /* is_encrypted(MimeInfo *) */
 772         pgpinline_decrypt,              /* decrypt(MimeInfo *) */
 773
 774         TRUE,
 775         pgpinline_sign,
 776
 777         TRUE,
 778         pgpinline_get_encrypt_data,
 779         pgpinline_encrypt,
 780         pgpinline_get_encrypt_warning,
 781         pgpinline_inhibit_encrypt_warning,
 782         prefs_gpg_auto_check_signatures,
 783 };
 784
 785 void pgpinline_init()
 786 {
 787         privacy_register_system(&pgpinline_system);
 788 }
 789
 790 void pgpinline_done()
 791 {
 792         privacy_unregister_system(&pgpinline_system);
 793 }
 794
 795 struct PluginFeature *plugin_provides(void)
 796 {
 797         static struct PluginFeature features[] =
 798                 { {PLUGIN_PRIVACY, N_("PGP/Inline")},
 799                   {PLUGIN_NOTHING, NULL}};
 800         return features;
 801 }
 802 #endif /* USE_GPGME */