src/plugins/pgpinline/pgpinline.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2016 Colin Leroy and the Claws Mail team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #  include "config.h"
  21 #include "claws-features.h"
  22 #endif
  23
  24 #ifdef USE_GPGME
  25
  26 #include "defs.h"
  27 #include <glib.h>
  28 #include <glib/gi18n.h>
  29 #include <errno.h>
  30 #include <gpgme.h>
  31 #include <file-utils.h>
  32
  33 #include "utils.h"
  34 #include "privacy.h"
  35 #include "procmime.h"
  36 #include "pgpinline.h"
  37 #include <plugins/pgpcore/sgpgme.h>
  38 #include <plugins/pgpcore/prefs_gpg.h>
  39 #include <plugins/pgpcore/passphrase.h>
  40 #include <plugins/pgpcore/pgp_utils.h>
  41 #include "quoted-printable.h"
  42 #include "codeconv.h"
  43 #include "plugin.h"
  44
  45 extern struct GPGConfig prefs_gpg;
  46
  47 typedef struct _PrivacyDataPGP PrivacyDataPGP;
  48
  49 struct _PrivacyDataPGP
  50 {
  51         PrivacyData     data;
  52
  53         gboolean        done_sigtest;
  54         gboolean        is_signed;
  55         gpgme_verify_result_t   sigstatus;
  56         gpgme_ctx_t     ctx;
  57 };
  58
  59 static PrivacySystem pgpinline_system;
  60
  61 static gint pgpinline_check_signature(MimeInfo *mimeinfo);
  62
  63 static PrivacyDataPGP *pgpinline_new_privacydata()
  64 {
  65         PrivacyDataPGP *data;
  66         gpgme_error_t err;
  67
  68         data = g_new0(PrivacyDataPGP, 1);
  69         data->data.system = &pgpinline_system;
  70         data->done_sigtest = FALSE;
  71         data->is_signed = FALSE;
  72         data->sigstatus = NULL;
  73         if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
  74                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
  75                 return NULL;
  76         }
  77
  78         return data;
  79 }
  80
  81 static void pgpinline_free_privacydata(PrivacyData *_data)
  82 {
  83         PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
  84         gpgme_release(data->ctx);
  85         g_free(data);
  86 }
  87
  88 static gboolean pgpinline_is_signed(MimeInfo *mimeinfo)
  89 {
  90         PrivacyDataPGP *data = NULL;
  91         const gchar *sig_indicator = "-----BEGIN PGP SIGNED MESSAGE-----";
  92         gchar *textdata, *sigpos;
  93
  94         cm_return_val_if_fail(mimeinfo != NULL, FALSE);
  95
  96         if (procmime_mimeinfo_parent(mimeinfo) == NULL)
  97                 return FALSE; /* not parent */
  98
  99         if (mimeinfo->type != MIMETYPE_TEXT &&
 100                 (mimeinfo->type != MIMETYPE_APPLICATION ||
 101                  g_ascii_strcasecmp(mimeinfo->subtype, "pgp")))
 102                 return FALSE;
 103
 104         /* Seal the deal. This has to be text/plain through and through. */
 105         if (mimeinfo->type == MIMETYPE_APPLICATION)
 106         {
 107                 mimeinfo->type = MIMETYPE_TEXT;
 108                 g_free(mimeinfo->subtype);
 109                 mimeinfo->subtype = g_strdup("plain");
 110         }
 111
 112         if (mimeinfo->privacy != NULL) {
 113                 data = (PrivacyDataPGP *) mimeinfo->privacy;
 114                 if (data->done_sigtest)
 115                         return data->is_signed;
 116         }
 117
 118         textdata = procmime_get_part_as_string(mimeinfo, TRUE);
 119         if (!textdata)
 120                 return FALSE;
 121
 122         if ((sigpos = strstr(textdata, sig_indicator)) == NULL) {
 123                 g_free(textdata);
 124                 return FALSE;
 125         }
 126
 127         if (!(sigpos == textdata) && !(sigpos[-1] == '\n')) {
 128                 g_free(textdata);
 129                 return FALSE;
 130         }
 131
 132         g_free(textdata);
 133
 134         if (data == NULL) {
 135                 data = pgpinline_new_privacydata();
 136                 mimeinfo->privacy = (PrivacyData *) data;
 137         }
 138         if (data != NULL) {
 139                 data->done_sigtest = TRUE;
 140                 data->is_signed = TRUE;
 141         }
 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 = procmime_get_part_as_string(mimeinfo, TRUE);
 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");
 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\n"), 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         return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
 224 }
 225
 226 static gchar *pgpinline_get_sig_info_short(MimeInfo *mimeinfo)
 227 {
 228         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 229
 230         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 231
 232         return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
 233 }
 234
 235 static gchar *pgpinline_get_sig_info_full(MimeInfo *mimeinfo)
 236 {
 237         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 238
 239         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 240
 241         return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
 242 }
 243
 244 static gboolean pgpinline_is_encrypted(MimeInfo *mimeinfo)
 245 {
 246         const gchar *begin_indicator = "-----BEGIN PGP MESSAGE-----";
 247         const gchar *end_indicator = "-----END PGP MESSAGE-----";
 248         gchar *textdata;
 249
 250         cm_return_val_if_fail(mimeinfo != NULL, FALSE);
 251
 252         if (procmime_mimeinfo_parent(mimeinfo) == NULL)
 253                 return FALSE; /* not parent */
 254
 255         if (mimeinfo->type != MIMETYPE_TEXT &&
 256                 (mimeinfo->type != MIMETYPE_APPLICATION ||
 257                  g_ascii_strcasecmp(mimeinfo->subtype, "pgp")))
 258                 return FALSE;
 259
 260         /* Seal the deal. This has to be text/plain through and through. */
 261         if (mimeinfo->type == MIMETYPE_APPLICATION)
 262         {
 263                 mimeinfo->type = MIMETYPE_TEXT;
 264                 g_free(mimeinfo->subtype);
 265                 mimeinfo->subtype = g_strdup("plain");
 266         }
 267
 268         textdata = procmime_get_part_as_string(mimeinfo, TRUE);
 269         if (!textdata)
 270                 return FALSE;
 271
 272         if (!pgp_locate_armor_header(textdata, begin_indicator)) {
 273                 g_free(textdata);
 274                 return FALSE;
 275         }
 276         if (!pgp_locate_armor_header(textdata, end_indicator)) {
 277                 g_free(textdata);
 278                 return FALSE;
 279         }
 280
 281         g_free(textdata);
 282
 283         return TRUE;
 284 }
 285
 286 static MimeInfo *pgpinline_decrypt(MimeInfo *mimeinfo)
 287 {
 288         MimeInfo *decinfo, *parseinfo;
 289         gpgme_data_t cipher, plain;
 290         FILE *dstfp;
 291         gchar *fname;
 292         gchar *textdata = NULL;
 293         static gint id = 0;
 294         const gchar *src_codeset = NULL;
 295         gpgme_verify_result_t sigstat = 0;
 296         PrivacyDataPGP *data = NULL;
 297         gpgme_ctx_t ctx;
 298         gchar *chars;
 299         size_t len;
 300         const gchar *begin_indicator = "-----BEGIN PGP MESSAGE-----";
 301         const gchar *end_indicator = "-----END PGP MESSAGE-----";
 302         gchar *pos;
 303
 304         if (gpgme_new(&ctx) != GPG_ERR_NO_ERROR)
 305                 return NULL;
 306
 307         gpgme_set_textmode(ctx, 1);
 308         gpgme_set_armor(ctx, 1);
 309
 310         cm_return_val_if_fail(mimeinfo != NULL, NULL);
 311         cm_return_val_if_fail(pgpinline_is_encrypted(mimeinfo), NULL);
 312
 313         if (procmime_mimeinfo_parent(mimeinfo) == NULL ||
 314             mimeinfo->type != MIMETYPE_TEXT) {
 315                 gpgme_release(ctx);
 316                 privacy_set_error(_("Couldn't parse mime part."));
 317                 return NULL;
 318         }
 319
 320         textdata = procmime_get_part_as_string(mimeinfo, TRUE);
 321         if (!textdata) {
 322                 gpgme_release(ctx);
 323                 privacy_set_error(_("Couldn't get text data."));
 324                 return NULL;
 325         }
 326
 327         debug_print("decrypting '%s'\n", textdata);
 328         gpgme_data_new_from_mem(&cipher, textdata, (size_t)strlen(textdata), 1);
 329
 330         plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
 331         if (sigstat && !sigstat->signatures)
 332                 sigstat = NULL;
 333
 334         gpgme_data_release(cipher);
 335
 336         if (plain == NULL) {
 337                 gpgme_release(ctx);
 338                 return NULL;
 339         }
 340
 341         fname = g_strdup_printf("%s%cplaintext.%08x",
 342                 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
 343
 344         if ((dstfp = claws_fopen(fname, "wb")) == NULL) {
 345                 FILE_OP_ERROR(fname, "claws_fopen");
 346                 privacy_set_error(_("Couldn't open decrypted file %s"), fname);
 347                 g_free(fname);
 348                 gpgme_data_release(plain);
 349                 gpgme_release(ctx);
 350                 return NULL;
 351         }
 352
 353         src_codeset = procmime_mimeinfo_get_parameter(mimeinfo, "charset");
 354         if (src_codeset == NULL)
 355                 src_codeset = CS_ISO_8859_1;
 356
 357         if (fprintf(dstfp, "MIME-Version: 1.0\r\n"
 358                         "Content-Type: text/plain; charset=%s\r\n"
 359                         "Content-Transfer-Encoding: 8bit\r\n"
 360                         "\r\n",
 361                         src_codeset) < 0) {
 362                 FILE_OP_ERROR(fname, "fprintf");
 363                 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 364                 goto FILE_ERROR;
 365         }
 366
 367         /* Store any part before encrypted text */
 368         pos = pgp_locate_armor_header(textdata, begin_indicator);
 369         if (pos != NULL && (pos - textdata) > 0) {
 370             if (claws_fwrite(textdata, 1, pos - textdata, dstfp) < pos - textdata) {
 371                 FILE_OP_ERROR(fname, "claws_fwrite");
 372                 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 373                 goto FILE_ERROR;
 374             }
 375         }
 376
 377         if (claws_fwrite(_("\n--- Start of PGP/Inline encrypted data ---\n"), 1,
 378                 strlen(_("\n--- Start of PGP/Inline encrypted data ---\n")),
 379                 dstfp) < strlen(_("\n--- Start of PGP/Inline encrypted data ---\n"))) {
 380                 FILE_OP_ERROR(fname, "claws_fwrite");
 381                 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 382                 goto FILE_ERROR;
 383         }
 384         chars = sgpgme_data_release_and_get_mem(plain, &len);
 385         if (len > 0) {
 386                 if (claws_fwrite(chars, 1, len, dstfp) < len) {
 387                         FILE_OP_ERROR(fname, "claws_fwrite");
 388                         g_free(chars);
 389                         privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 390                         goto FILE_ERROR;
 391                 }
 392         }
 393         g_free(chars);
 394         /* Store any part after encrypted text */
 395         if (claws_fwrite(_("--- End of PGP/Inline encrypted data ---\n"), 1,
 396                 strlen(_("--- End of PGP/Inline encrypted data ---\n")),
 397                 dstfp) < strlen(_("--- End of PGP/Inline encrypted data ---\n"))) {
 398                         FILE_OP_ERROR(fname, "claws_fwrite");
 399                         privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 400                         goto FILE_ERROR;
 401         }
 402         if (pos != NULL) {
 403             pos = pgp_locate_armor_header(pos, end_indicator);
 404             if (pos != NULL && *pos != '\0') {
 405                 pos += strlen(end_indicator);
 406                 if (claws_fwrite(pos, 1, strlen(pos), dstfp) < strlen(pos)) {
 407                         FILE_OP_ERROR(fname, "claws_fwrite");
 408                         privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 409                         goto FILE_ERROR;
 410                 }
 411             }
 412         }
 413
 414         if (claws_safe_fclose(dstfp) == EOF) {
 415                 FILE_OP_ERROR(fname, "claws_fclose");
 416                 privacy_set_error(_("Couldn't close decrypted file %s"), fname);
 417                 g_free(fname);
 418                 gpgme_data_release(plain);
 419                 gpgme_release(ctx);
 420                 return NULL;
 421         }
 422
 423         parseinfo = procmime_scan_file(fname);
 424         g_free(fname);
 425
 426         if (parseinfo == NULL) {
 427                 gpgme_release(ctx);
 428                 privacy_set_error(_("Couldn't scan decrypted file."));
 429                 return NULL;
 430         }
 431         decinfo = g_node_first_child(parseinfo->node) != NULL ?
 432                 g_node_first_child(parseinfo->node)->data : NULL;
 433
 434         if (decinfo == NULL) {
 435                 gpgme_release(ctx);
 436                 privacy_set_error(_("Couldn't scan decrypted file parts."));
 437                 return NULL;
 438         }
 439
 440         g_node_unlink(decinfo->node);
 441         procmime_mimeinfo_free_all(&parseinfo);
 442
 443         decinfo->tmp = TRUE;
 444
 445         if (sigstat != GPGME_SIG_STAT_NONE) {
 446                 if (decinfo->privacy != NULL) {
 447                         data = (PrivacyDataPGP *) decinfo->privacy;
 448                 } else {
 449                         data = pgpinline_new_privacydata();
 450                         decinfo->privacy = (PrivacyData *) data;
 451                 }
 452                 if (data != NULL) {
 453                         data->done_sigtest = TRUE;
 454                         data->is_signed = TRUE;
 455                         data->sigstatus = sigstat;
 456                         if (data->ctx)
 457                                 gpgme_release(data->ctx);
 458                         data->ctx = ctx;
 459                 }
 460         } else
 461                 gpgme_release(ctx);
 462
 463         return decinfo;
 464
 465 FILE_ERROR:
 466         claws_fclose(dstfp);
 467         g_free(fname);
 468         gpgme_data_release(plain);
 469         gpgme_release(ctx);
 470         return NULL;
 471 }
 472
 473 static gboolean pgpinline_sign(MimeInfo *mimeinfo, PrefsAccount *account, const gchar *from_addr)
 474 {
 475         MimeInfo *msgcontent;
 476         gchar *textstr, *tmp;
 477         FILE *fp;
 478         gchar *sigcontent;
 479         gpgme_ctx_t ctx;
 480         gpgme_data_t gpgtext, gpgsig;
 481         size_t len;
 482         gpgme_error_t err;
 483         struct passphrase_cb_info_s info;
 484         gpgme_sign_result_t result = NULL;
 485
 486         memset (&info, 0, sizeof info);
 487
 488         /* get content node from message */
 489         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 490         if (msgcontent->type == MIMETYPE_MULTIPART) {
 491                 if (!msgcontent->node->children) {
 492                         debug_print("msgcontent->node->children NULL, bailing\n");
 493                         privacy_set_error(_("Malformed message"));
 494                         return FALSE;
 495                 }
 496                 msgcontent = (MimeInfo *) msgcontent->node->children->data;
 497         }
 498         /* get rid of quoted-printable or anything */
 499         procmime_decode_content(msgcontent);
 500
 501         fp = my_tmpfile();
 502         if (fp == NULL) {
 503                 perror("my_tmpfile");
 504                 privacy_set_error(_("Couldn't create temporary file, %s"), g_strerror(errno));
 505                 return FALSE;
 506         }
 507         procmime_write_mimeinfo(msgcontent, fp);
 508         rewind(fp);
 509
 510         /* read temporary file into memory */
 511         textstr = file_read_stream_to_str_no_recode(fp);
 512
 513         claws_fclose(fp);
 514
 515         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 516         gpgme_data_new(&gpgsig);
 517         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 518                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
 519                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 520                 return FALSE;
 521         }
 522         gpgme_set_textmode(ctx, 1);
 523         gpgme_set_armor(ctx, 1);
 524
 525         if (!sgpgme_setup_signers(ctx, account, from_addr)) {
 526                 gpgme_release(ctx);
 527                 return FALSE;
 528         }
 529
 530         prefs_gpg_enable_agent(prefs_gpg_get_config()->use_gpg_agent);
 531         if (!g_getenv("GPG_AGENT_INFO") || !prefs_gpg_get_config()->use_gpg_agent) {
 532                 info.c = ctx;
 533                 gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
 534         }
 535
 536         err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_CLEAR);
 537         if (err != GPG_ERR_NO_ERROR) {
 538                 if (err == GPG_ERR_CANCELED) {
 539                         /* ignore cancelled signing */
 540                         privacy_reset_error();
 541                         debug_print("gpgme_op_sign cancelled\n");
 542                 } else {
 543                         privacy_set_error(_("Data signing failed, %s"), gpgme_strerror(err));
 544                         debug_print("gpgme_op_sign error : %x\n", err);
 545                 }
 546                 gpgme_release(ctx);
 547                 return FALSE;
 548         }
 549         result = gpgme_op_sign_result(ctx);
 550         if (result && result->signatures) {
 551                 gpgme_new_signature_t sig = result->signatures;
 552                 while (sig) {
 553                         debug_print("valid signature: %s\n", sig->fpr);
 554                         sig = sig->next;
 555                 }
 556         } else if (result && result->invalid_signers) {
 557                 gpgme_invalid_key_t invalid = result->invalid_signers;
 558                 while (invalid) {
 559                         g_warning("invalid signer: %s (%s)", invalid->fpr,
 560                                 gpgme_strerror(invalid->reason));
 561                         privacy_set_error(_("Data signing failed due to invalid signer: %s"),
 562                                 gpgme_strerror(invalid->reason));
 563                         invalid = invalid->next;
 564                 }
 565                 gpgme_release(ctx);
 566                 return FALSE;
 567         } else {
 568                 /* can't get result (maybe no signing key?) */
 569                 debug_print("gpgme_op_sign_result error\n");
 570                 privacy_set_error(_("Data signing failed, no results."));
 571                 gpgme_release(ctx);
 572                 return FALSE;
 573         }
 574
 575
 576         sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
 577
 578         if (sigcontent == NULL || len <= 0) {
 579                 g_warning("sgpgme_data_release_and_get_mem failed");
 580                 privacy_set_error(_("Data signing failed, no contents."));
 581                 gpgme_data_release(gpgtext);
 582                 g_free(textstr);
 583                 g_free(sigcontent);
 584                 gpgme_release(ctx);
 585                 return FALSE;
 586         }
 587
 588         tmp = g_malloc(len+1);
 589         memmove(tmp, sigcontent, len+1);
 590         tmp[len] = '\0';
 591         gpgme_data_release(gpgtext);
 592         g_free(textstr);
 593         g_free(sigcontent);
 594
 595         if (msgcontent->content == MIMECONTENT_FILE &&
 596             msgcontent->data.filename != NULL) {
 597                 if (msgcontent->tmp == TRUE)
 598                         claws_unlink(msgcontent->data.filename);
 599                 g_free(msgcontent->data.filename);
 600         }
 601         msgcontent->data.mem = g_strdup(tmp);
 602         msgcontent->content = MIMECONTENT_MEM;
 603         g_free(tmp);
 604
 605         /* avoid all sorts of clear-signing problems with non ascii
 606          * chars
 607          */
 608         procmime_encode_content(msgcontent, ENC_BASE64);
 609         gpgme_release(ctx);
 610
 611         return TRUE;
 612 }
 613
 614 static gchar *pgpinline_get_encrypt_data(GSList *recp_names)
 615 {
 616         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_OpenPGP);
 617 }
 618
 619 static const gchar *pgpinline_get_encrypt_warning(void)
 620 {
 621         if (prefs_gpg_should_skip_encryption_warning(pgpinline_system.id))
 622                 return NULL;
 623         else
 624                 return _("Please note that attachments are not encrypted by "
 625                  "the PGP/Inline system, nor are email headers, like Subject.");
 626 }
 627
 628 static void pgpinline_inhibit_encrypt_warning(gboolean inhibit)
 629 {
 630         if (inhibit)
 631                 prefs_gpg_add_skip_encryption_warning(pgpinline_system.id);
 632         else
 633                 prefs_gpg_remove_skip_encryption_warning(pgpinline_system.id);
 634 }
 635
 636 static gboolean pgpinline_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
 637 {
 638         MimeInfo *msgcontent;
 639         FILE *fp;
 640         gchar *enccontent;
 641         size_t len;
 642         gchar *textstr, *tmp;
 643         gpgme_data_t gpgtext, gpgenc;
 644         gpgme_ctx_t ctx;
 645         gpgme_key_t *kset = NULL;
 646         gchar **fprs = g_strsplit(encrypt_data, " ", -1);
 647         gpgme_error_t err;
 648         gint i = 0;
 649
 650         while (fprs[i] && strlen(fprs[i])) {
 651                 i++;
 652         }
 653
 654         kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
 655         memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
 656         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 657                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
 658                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 659                 g_free(kset);
 660                 return FALSE;
 661         }
 662         i = 0;
 663         while (fprs[i] && strlen(fprs[i])) {
 664                 gpgme_key_t key;
 665                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
 666                 if (err) {
 667                         debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
 668                         privacy_set_error(_("Couldn't add GPG key %s, %s"), fprs[i], gpgme_strerror(err));
 669                         g_free(kset);
 670                         return FALSE;
 671                 }
 672                 debug_print("found %s at %d\n", fprs[i], i);
 673                 kset[i] = key;
 674                 i++;
 675         }
 676
 677
 678         debug_print("Encrypting message content\n");
 679
 680         /* get content node from message */
 681         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 682         if (msgcontent->type == MIMETYPE_MULTIPART) {
 683                 if (!msgcontent->node->children) {
 684                         debug_print("msgcontent->node->children NULL, bailing\n");
 685                         privacy_set_error(_("Malformed message"));
 686                         g_free(kset);
 687                         return FALSE;
 688                 }
 689                 msgcontent = (MimeInfo *) msgcontent->node->children->data;
 690         }
 691         /* get rid of quoted-printable or anything */
 692         procmime_decode_content(msgcontent);
 693
 694         fp = my_tmpfile();
 695         if (fp == NULL) {
 696                 privacy_set_error(_("Couldn't create temporary file, %s"), g_strerror(errno));
 697                 perror("my_tmpfile");
 698                 g_free(kset);
 699                 return FALSE;
 700         }
 701         procmime_write_mimeinfo(msgcontent, fp);
 702         rewind(fp);
 703
 704         /* read temporary file into memory */
 705         textstr = file_read_stream_to_str_no_recode(fp);
 706
 707         claws_fclose(fp);
 708
 709         /* encrypt data */
 710         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 711         gpgme_data_new(&gpgenc);
 712         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 713                 debug_print(("Couldn't initialize GPG context, %s\n"), gpgme_strerror(err));
 714                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 715                 g_free(kset);
 716                 return FALSE;
 717         }
 718         gpgme_set_armor(ctx, 1);
 719
 720         err = gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
 721
 722         enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
 723         g_free(kset);
 724
 725         if (enccontent == NULL || len <= 0) {
 726                 g_warning("sgpgme_data_release_and_get_mem failed");
 727                 privacy_set_error(_("Encryption failed, %s"), gpgme_strerror(err));
 728                 gpgme_data_release(gpgtext);
 729                 g_free(textstr);
 730                 gpgme_release(ctx);
 731                 g_free(enccontent);
 732                 return FALSE;
 733         }
 734
 735         tmp = g_malloc(len+1);
 736         memmove(tmp, enccontent, len+1);
 737         tmp[len] = '\0';
 738         g_free(enccontent);
 739
 740         gpgme_data_release(gpgtext);
 741         g_free(textstr);
 742
 743         if (msgcontent->content == MIMECONTENT_FILE &&
 744             msgcontent->data.filename != NULL) {
 745                 if (msgcontent->tmp == TRUE)
 746                         claws_unlink(msgcontent->data.filename);
 747                 g_free(msgcontent->data.filename);
 748         }
 749         msgcontent->data.mem = g_strdup(tmp);
 750         msgcontent->content = MIMECONTENT_MEM;
 751         g_free(tmp);
 752         gpgme_release(ctx);
 753
 754         return TRUE;
 755 }
 756
 757 static PrivacySystem pgpinline_system = {
 758         "pgpinline",                    /* id */
 759         "PGP Inline",                   /* name */
 760
 761         pgpinline_free_privacydata,     /* free_privacydata */
 762
 763         pgpinline_is_signed,            /* is_signed(MimeInfo *) */
 764         pgpinline_check_signature,      /* check_signature(MimeInfo *) */
 765         pgpinline_get_sig_status,       /* get_sig_status(MimeInfo *) */
 766         pgpinline_get_sig_info_short,   /* get_sig_info_short(MimeInfo *) */
 767         pgpinline_get_sig_info_full,    /* get_sig_info_full(MimeInfo *) */
 768
 769         pgpinline_is_encrypted,         /* is_encrypted(MimeInfo *) */
 770         pgpinline_decrypt,              /* decrypt(MimeInfo *) */
 771
 772         TRUE,
 773         pgpinline_sign,
 774
 775         TRUE,
 776         pgpinline_get_encrypt_data,
 777         pgpinline_encrypt,
 778         pgpinline_get_encrypt_warning,
 779         pgpinline_inhibit_encrypt_warning,
 780         prefs_gpg_auto_check_signatures,
 781 };
 782
 783 void pgpinline_init()
 784 {
 785         privacy_register_system(&pgpinline_system);
 786 }
 787
 788 void pgpinline_done()
 789 {
 790         privacy_unregister_system(&pgpinline_system);
 791 }
 792
 793 struct PluginFeature *plugin_provides(void)
 794 {
 795         static struct PluginFeature features[] =
 796                 { {PLUGIN_PRIVACY, N_("PGP/Inline")},
 797                   {PLUGIN_NOTHING, NULL}};
 798         return features;
 799 }
 800 #endif /* USE_GPGME */