src/plugins/smime/smime.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, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  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 <gpgme.h>
  31 #include <ctype.h>
  32 #include <glib/gi18n.h>
  33
  34 #include "utils.h"
  35 #include "privacy.h"
  36 #include "procmime.h"
  37
  38 #include "smime.h"
  39 #include <plugins/pgpcore/sgpgme.h>
  40 #include <plugins/pgpcore/prefs_gpg.h>
  41 #include <plugins/pgpcore/passphrase.h>
  42
  43 #include "alertpanel.h"
  44 #include "prefs_common.h"
  45 #include "procmime.h"
  46 #include "plugin.h"
  47
  48 typedef struct _PrivacyDataPGP PrivacyDataPGP;
  49
  50 struct _PrivacyDataPGP
  51 {
  52         PrivacyData     data;
  53
  54         gboolean        done_sigtest;
  55         gboolean        is_signed;
  56         gpgme_verify_result_t   sigstatus;
  57         gpgme_ctx_t     ctx;
  58 };
  59
  60 static PrivacySystem smime_system;
  61
  62 static gint smime_check_signature(MimeInfo *mimeinfo);
  63
  64 static PrivacyDataPGP *smime_new_privacydata()
  65 {
  66         PrivacyDataPGP *data;
  67
  68         data = g_new0(PrivacyDataPGP, 1);
  69         data->data.system = &smime_system;
  70         data->done_sigtest = FALSE;
  71         data->is_signed = FALSE;
  72         data->sigstatus = NULL;
  73         gpgme_new(&data->ctx);
  74
  75         return data;
  76 }
  77
  78 static void smime_free_privacydata(PrivacyData *_data)
  79 {
  80         PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
  81         gpgme_release(data->ctx);
  82         g_free(data);
  83 }
  84
  85 static gboolean smime_is_signed(MimeInfo *mimeinfo)
  86 {
  87         MimeInfo *parent;
  88         MimeInfo *signature;
  89         const gchar *protocol, *tmpstr;
  90         PrivacyDataPGP *data = NULL;
  91
  92         cm_return_val_if_fail(mimeinfo != NULL, FALSE);
  93         if (mimeinfo->privacy != NULL) {
  94                 data = (PrivacyDataPGP *) mimeinfo->privacy;
  95                 if (data->done_sigtest)
  96                         return data->is_signed;
  97         }
  98
  99         if (!g_ascii_strcasecmp(mimeinfo->subtype, "pkcs7-mime") ||
 100             !g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
 101                 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
 102                 if (tmpstr && !g_ascii_strcasecmp(tmpstr, "signed-data")) {
 103                         if (data == NULL) {
 104                                 data = smime_new_privacydata();
 105                                 mimeinfo->privacy = (PrivacyData *) data;
 106                         }
 107
 108                         data->done_sigtest = TRUE;
 109                         data->is_signed = TRUE;
 110                         smime_check_signature(mimeinfo);
 111                         return TRUE;
 112                 }
 113         }
 114
 115         /* check parent */
 116         parent = procmime_mimeinfo_parent(mimeinfo);
 117         if (parent == NULL)
 118                 return FALSE;
 119
 120         if ((parent->type != MIMETYPE_MULTIPART) ||
 121             g_ascii_strcasecmp(parent->subtype, "signed"))
 122                 return FALSE;
 123         protocol = procmime_mimeinfo_get_parameter(parent, "protocol");
 124         if ((protocol == NULL) ||
 125             (g_ascii_strcasecmp(protocol, "application/pkcs7-signature") &&
 126              g_ascii_strcasecmp(protocol, "application/x-pkcs7-signature")))
 127                 return FALSE;
 128
 129         /* check if mimeinfo is the first child */
 130         if (parent->node->children->data != mimeinfo)
 131                 return FALSE;
 132
 133
 134         /* check signature */
 135         signature = parent->node->children->next != NULL ?
 136             (MimeInfo *) parent->node->children->next->data : NULL;
 137         if (signature == NULL)
 138                 return FALSE;
 139         if ((signature->type != MIMETYPE_APPLICATION) ||
 140             (g_ascii_strcasecmp(signature->subtype, "pkcs7-signature") &&
 141              g_ascii_strcasecmp(signature->subtype, "x-pkcs7-signature")))
 142                 return FALSE;
 143
 144         if (data == NULL) {
 145                 data = smime_new_privacydata();
 146                 mimeinfo->privacy = (PrivacyData *) data;
 147         }
 148
 149         data->done_sigtest = TRUE;
 150         data->is_signed = TRUE;
 151
 152         return TRUE;
 153 }
 154
 155 static gchar *get_canonical_content(FILE *fp, const gchar *boundary)
 156 {
 157         gchar *ret;
 158         GString *textbuffer;
 159         guint boundary_len = 0;
 160         gchar buf[BUFFSIZE];
 161
 162         if (boundary) {
 163                 boundary_len = strlen(boundary);
 164                 while (fgets(buf, sizeof(buf), fp) != NULL)
 165                         if (IS_BOUNDARY(buf, boundary, boundary_len))
 166                                 break;
 167         }
 168
 169         textbuffer = g_string_new("");
 170         while (fgets(buf, sizeof(buf), fp) != NULL) {
 171                 gchar *buf2;
 172
 173                 if (boundary && IS_BOUNDARY(buf, boundary, boundary_len))
 174                         break;
 175
 176                 buf2 = canonicalize_str(buf);
 177                 g_string_append(textbuffer, buf2);
 178                 g_free(buf2);
 179         }
 180         g_string_truncate(textbuffer, textbuffer->len - 2);
 181
 182         ret = textbuffer->str;
 183         g_string_free(textbuffer, FALSE);
 184
 185         return ret;
 186 }
 187
 188 static gint smime_check_signature(MimeInfo *mimeinfo)
 189 {
 190         PrivacyDataPGP *data;
 191         MimeInfo *parent, *signature;
 192         FILE *fp;
 193         gchar *boundary;
 194         gchar *textstr = NULL;
 195         const gchar *tmpstr;
 196         gpgme_data_t sigdata = NULL, textdata = NULL;
 197         gpgme_error_t err;
 198         cm_return_val_if_fail(mimeinfo != NULL, -1);
 199         cm_return_val_if_fail(mimeinfo->privacy != NULL, -1);
 200         data = (PrivacyDataPGP *) mimeinfo->privacy;
 201         gpgme_new(&data->ctx);
 202         EncodingType oldenc = ENC_BINARY;
 203
 204         debug_print("Checking S/MIME signature\n");
 205
 206         err = gpgme_set_protocol(data->ctx, GPGME_PROTOCOL_CMS);
 207
 208         if (err) {
 209                 debug_print ("gpgme_set_protocol failed: %s\n",
 210                    gpgme_strerror (err));
 211         }
 212         parent = procmime_mimeinfo_parent(mimeinfo);
 213
 214         fp = g_fopen(parent->data.filename, "rb");
 215         cm_return_val_if_fail(fp != NULL, SIGNATURE_INVALID);
 216
 217         boundary = g_hash_table_lookup(parent->typeparameters, "boundary");
 218         if (!boundary) {
 219                 gchar *tmpfile = get_tmp_file();
 220                 debug_print("no boundary\n");
 221                 if (tmpfile) {
 222                         if (mimeinfo->encoding_type != ENC_BASE64) {
 223                                 procmime_encode_content(mimeinfo, ENC_BASE64);
 224                         }
 225                         oldenc = mimeinfo->encoding_type;
 226                         if (mimeinfo->encoding_type == ENC_BASE64)
 227                                 mimeinfo->encoding_type = ENC_BINARY;
 228                         if (procmime_get_part(tmpfile, mimeinfo) == 0) {
 229                                 textstr = file_read_to_str(tmpfile);
 230                         } else {
 231                                 textstr = NULL;
 232                         }
 233                         if (mimeinfo->encoding_type != oldenc)
 234                                 mimeinfo->encoding_type = oldenc;
 235                 }
 236                 g_free(tmpfile);
 237         } else {
 238                 textstr = get_canonical_content(fp, boundary);
 239         }
 240         err = gpgme_data_new_from_mem(&textdata, textstr, textstr?strlen(textstr):0, 0);
 241
 242         if (err) {
 243                 debug_print ("gpgme_data_new_from_mem failed: %s\n",
 244                    gpgme_strerror (err));
 245         }
 246
 247         if (!g_ascii_strcasecmp(mimeinfo->subtype, "pkcs7-mime") ||
 248             !g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
 249                 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
 250                 if (tmpstr && !g_ascii_strcasecmp(tmpstr, "signed-data")) {
 251                         gpgme_data_t cipher;
 252                         size_t len;
 253                         if (oldenc == ENC_BASE64)
 254                                 gpgme_data_set_encoding (textdata, GPGME_DATA_ENCODING_BASE64);
 255                         gpgme_data_new(&cipher);
 256                         data->sigstatus =
 257                                 sgpgme_verify_signature (data->ctx, textdata, NULL, cipher);
 258                         gpgme_data_release(textdata);
 259                         g_free(textstr);
 260                         cm_gpgme_data_rewind(cipher);
 261                         textstr = sgpgme_data_release_and_get_mem(cipher, &len);
 262                         fclose(fp);
 263                         if (textstr && len > 0)
 264                                 textstr[len-1]='\0';
 265
 266                         if (textstr && len) {
 267                                 gchar *tmp_file = get_tmp_file();
 268                                 MimeInfo *newinfo = NULL, *decinfo = NULL, *parentinfo = NULL;
 269
 270                                 str_write_to_file(textstr, tmp_file);
 271                                 newinfo = procmime_scan_file(tmp_file);
 272                                 decinfo = g_node_first_child(newinfo->node) != NULL ?
 273                                         g_node_first_child(newinfo->node)->data : NULL;
 274
 275                                 if (decinfo == NULL)
 276                                         return -1;
 277
 278                                 g_node_unlink(decinfo->node);
 279                                 procmime_mimeinfo_free_all(newinfo);
 280                                 decinfo->tmp = TRUE;
 281                                 parentinfo = procmime_mimeinfo_parent(mimeinfo);
 282
 283                                 if (parentinfo->type == MIMETYPE_MESSAGE &&
 284                                     !strcmp(parentinfo->subtype, "rfc822")) {
 285                                         procmime_decode_content(parentinfo);
 286                                         procmime_encode_content(parentinfo, ENC_BASE64);
 287                                         procmime_encode_content(parentinfo, ENC_8BIT);
 288                                         if (parentinfo->content == MIMECONTENT_MEM) {
 289                                                 gint newlen =
 290                                                         (gint)(strstr(parentinfo->data.mem, "\n\n") - parentinfo->data.mem);
 291                                                 if (newlen > 0)
 292                                                         parentinfo->length = newlen;
 293                                         }
 294                                 }
 295                                 g_node_prepend(parentinfo->node, decinfo->node);
 296                                 return 0;
 297                         } else {
 298                                 return -1;
 299                         }
 300                 }
 301         }
 302
 303         signature = (MimeInfo *) mimeinfo->node->next->data;
 304         sigdata = sgpgme_data_from_mimeinfo(signature);
 305
 306         err = 0;
 307         if (signature->encoding_type == ENC_BASE64) {
 308                 err = gpgme_data_set_encoding (sigdata, GPGME_DATA_ENCODING_BASE64);
 309         }
 310
 311         if (err) {
 312                 debug_print ("gpgme_data_set_encoding failed: %s\n",
 313                         gpgme_strerror (err));
 314         }
 315
 316         data->sigstatus =
 317                 sgpgme_verify_signature (data->ctx, sigdata, textdata, NULL);
 318
 319         gpgme_data_release(sigdata);
 320         gpgme_data_release(textdata);
 321         g_free(textstr);
 322         fclose(fp);
 323
 324         return 0;
 325 }
 326
 327 static SignatureStatus smime_get_sig_status(MimeInfo *mimeinfo)
 328 {
 329         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 330
 331         cm_return_val_if_fail(data != NULL, SIGNATURE_INVALID);
 332
 333         return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
 334 }
 335
 336 static gchar *smime_get_sig_info_short(MimeInfo *mimeinfo)
 337 {
 338         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 339
 340         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 341
 342         return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
 343 }
 344
 345 static gchar *smime_get_sig_info_full(MimeInfo *mimeinfo)
 346 {
 347         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 348
 349         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 350
 351         return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
 352 }
 353
 354 static gboolean smime_is_encrypted(MimeInfo *mimeinfo)
 355 {
 356         const gchar *tmpstr;
 357
 358         if (mimeinfo->type != MIMETYPE_APPLICATION)
 359                 return FALSE;
 360         if (!g_ascii_strcasecmp(mimeinfo->subtype, "pkcs7-mime")) {
 361                 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
 362                 if (tmpstr && g_ascii_strcasecmp(tmpstr, "enveloped-data"))
 363                         return FALSE;
 364                 else
 365                         return TRUE;
 366
 367         } else if (!g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
 368                 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
 369                 if (tmpstr && g_ascii_strcasecmp(tmpstr, "enveloped-data"))
 370                         return FALSE;
 371                 else
 372                         return TRUE;
 373         }
 374         return FALSE;
 375 }
 376
 377 static MimeInfo *smime_decrypt(MimeInfo *mimeinfo)
 378 {
 379         MimeInfo *encinfo, *decinfo, *parseinfo;
 380         gpgme_data_t cipher = NULL, plain = NULL;
 381         static gint id = 0;
 382         FILE *dstfp;
 383         gchar *fname;
 384         gpgme_verify_result_t sigstat = NULL;
 385         PrivacyDataPGP *data = NULL;
 386         gpgme_ctx_t ctx;
 387         gpgme_error_t err;
 388         gchar *chars;
 389         size_t len;
 390
 391         cm_return_val_if_fail(smime_is_encrypted(mimeinfo), NULL);
 392
 393         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 394                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 395                 return NULL;
 396         }
 397
 398         err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
 399         if (err) {
 400                 debug_print ("gpgme_set_protocol failed: %s\n",
 401                    gpgme_strerror (err));
 402                 privacy_set_error(_("Couldn't set GPG protocol, %s"), gpgme_strerror(err));
 403                 gpgme_release(ctx);
 404                 return NULL;
 405         }
 406         gpgme_set_armor(ctx, TRUE);
 407
 408         encinfo = mimeinfo;
 409
 410         cipher = sgpgme_data_from_mimeinfo(encinfo);
 411
 412         plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
 413
 414         gpgme_data_release(cipher);
 415         if (plain == NULL) {
 416                 debug_print("plain is null!\n");
 417                 gpgme_release(ctx);
 418                 return NULL;
 419         }
 420
 421         fname = g_strdup_printf("%s%cplaintext.%08x",
 422                 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
 423
 424         if ((dstfp = g_fopen(fname, "wb")) == NULL) {
 425                 FILE_OP_ERROR(fname, "g_fopen");
 426                 g_free(fname);
 427                 gpgme_data_release(plain);
 428                 gpgme_release(ctx);
 429                 debug_print("can't open!\n");
 430                 privacy_set_error(_("Couldn't open temporary file"));
 431                 return NULL;
 432         }
 433
 434         if (fprintf(dstfp, "MIME-Version: 1.0\n") < 0) {
 435                 FILE_OP_ERROR(fname, "fprintf");
 436                 g_free(fname);
 437                 fclose(dstfp);
 438                 gpgme_data_release(plain);
 439                 gpgme_release(ctx);
 440                 debug_print("can't close!\n");
 441                 privacy_set_error(_("Couldn't write to temporary file"));
 442                 return NULL;
 443         }
 444
 445         chars = sgpgme_data_release_and_get_mem(plain, &len);
 446
 447         if (len > 0) {
 448                 if (fwrite(chars, 1, len, dstfp) < len) {
 449                         FILE_OP_ERROR(fname, "fwrite");
 450                         fclose(dstfp);
 451                         g_free(fname);
 452                         g_free(chars);
 453                         gpgme_data_release(plain);
 454                         gpgme_release(ctx);
 455                         debug_print("can't write!\n");
 456                         privacy_set_error(_("Couldn't write to temporary file"));
 457                         return NULL;
 458                 }
 459         }
 460         if (fclose(dstfp) == EOF) {
 461                 FILE_OP_ERROR(fname, "fclose");
 462                 g_free(fname);
 463                 g_free(chars);
 464                 gpgme_data_release(plain);
 465                 gpgme_release(ctx);
 466                 debug_print("can't close!\n");
 467                 privacy_set_error(_("Couldn't close temporary file"));
 468                 return NULL;
 469         }
 470         g_free(chars);
 471
 472         parseinfo = procmime_scan_file(fname);
 473         g_free(fname);
 474         if (parseinfo == NULL) {
 475                 privacy_set_error(_("Couldn't parse decrypted file."));
 476                 gpgme_release(ctx);
 477                 return NULL;
 478         }
 479         decinfo = g_node_first_child(parseinfo->node) != NULL ?
 480                 g_node_first_child(parseinfo->node)->data : NULL;
 481         if (decinfo == NULL) {
 482                 privacy_set_error(_("Couldn't parse decrypted file parts."));
 483                 gpgme_release(ctx);
 484                 return NULL;
 485         }
 486
 487         g_node_unlink(decinfo->node);
 488         procmime_mimeinfo_free_all(parseinfo);
 489
 490         decinfo->tmp = TRUE;
 491
 492         if (sigstat != NULL && sigstat->signatures != NULL) {
 493                 if (decinfo->privacy != NULL) {
 494                         data = (PrivacyDataPGP *) decinfo->privacy;
 495                 } else {
 496                         data = smime_new_privacydata();
 497                         decinfo->privacy = (PrivacyData *) data;
 498                 }
 499                 data->done_sigtest = TRUE;
 500                 data->is_signed = TRUE;
 501                 data->sigstatus = sigstat;
 502                 if (data->ctx)
 503                         gpgme_release(data->ctx);
 504                 data->ctx = ctx;
 505         } else
 506                 gpgme_release(ctx);
 507
 508
 509
 510         return decinfo;
 511 }
 512
 513 gboolean smime_sign(MimeInfo *mimeinfo, PrefsAccount *account, const gchar *from_addr)
 514 {
 515         MimeInfo *msgcontent, *sigmultipart, *newinfo;
 516         gchar *textstr, *micalg = NULL;
 517         FILE *fp;
 518         gchar *boundary = NULL;
 519         gchar *sigcontent;
 520         gpgme_ctx_t ctx;
 521         gpgme_data_t gpgtext, gpgsig;
 522         gpgme_error_t err;
 523         size_t len;
 524         struct passphrase_cb_info_s info;
 525         gpgme_sign_result_t result = NULL;
 526         gchar *test_msg;
 527         gchar *real_content = NULL;
 528
 529         fp = my_tmpfile();
 530         if (fp == NULL) {
 531                 perror("my_tmpfile");
 532                 return FALSE;
 533         }
 534         procmime_write_mimeinfo(mimeinfo, fp);
 535         rewind(fp);
 536
 537         /* read temporary file into memory */
 538         test_msg = file_read_stream_to_str(fp);
 539         fclose(fp);
 540
 541         memset (&info, 0, sizeof info);
 542
 543         /* remove content node from message */
 544         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 545         g_node_unlink(msgcontent->node);
 546
 547         /* create temporary multipart for content */
 548         sigmultipart = procmime_mimeinfo_new();
 549         sigmultipart->type = MIMETYPE_MULTIPART;
 550         sigmultipart->subtype = g_strdup("signed");
 551
 552         do {
 553                 if (boundary)
 554                         g_free(boundary);
 555                 boundary = generate_mime_boundary("Sig");
 556         } while (strstr(test_msg, boundary) != NULL);
 557
 558         g_free(test_msg);
 559
 560         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
 561                             g_strdup(boundary));
 562         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("protocol"),
 563                             g_strdup("application/pkcs7-signature"));
 564         g_node_append(sigmultipart->node, msgcontent->node);
 565         g_node_append(mimeinfo->node, sigmultipart->node);
 566
 567         /* write message content to temporary file */
 568         fp = my_tmpfile();
 569         if (fp == NULL) {
 570                 perror("my_tmpfile");
 571                 return FALSE;
 572         }
 573         procmime_write_mimeinfo(sigmultipart, fp);
 574         rewind(fp);
 575
 576         /* read temporary file into memory */
 577         textstr = get_canonical_content(fp, boundary);
 578
 579         g_free(boundary);
 580
 581         fclose(fp);
 582
 583         gpgme_data_new_from_mem(&gpgtext, textstr, textstr?strlen(textstr):0, 0);
 584         gpgme_data_new(&gpgsig);
 585         gpgme_new(&ctx);
 586         gpgme_set_armor(ctx, TRUE);
 587         gpgme_signers_clear (ctx);
 588
 589         err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
 590
 591         if (err) {
 592                 debug_print ("gpgme_set_protocol failed: %s\n",
 593                    gpgme_strerror (err));
 594                 gpgme_data_release(gpgtext);
 595                 gpgme_release(ctx);
 596                 return FALSE;
 597         }
 598
 599         if (!sgpgme_setup_signers(ctx, account, from_addr)) {
 600                 debug_print("setup_signers failed\n");
 601                 gpgme_data_release(gpgtext);
 602                 gpgme_release(ctx);
 603                 return FALSE;
 604         }
 605
 606         info.c = ctx;
 607         prefs_gpg_enable_agent(TRUE);
 608         gpgme_set_passphrase_cb (ctx, NULL, &info);
 609
 610         err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_DETACH);
 611         if (err != GPG_ERR_NO_ERROR) {
 612                 alertpanel_error("S/MIME : Cannot sign, %s (%d)", gpg_strerror(err), gpg_err_code(err));
 613                 gpgme_data_release(gpgtext);
 614                 gpgme_release(ctx);
 615                 return FALSE;
 616         }
 617         result = gpgme_op_sign_result(ctx);
 618         if (result && result->signatures) {
 619             if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 620                 micalg = g_strdup_printf("pgp-%s", g_ascii_strdown(gpgme_hash_algo_name(
 621                             result->signatures->hash_algo),-1));
 622             } else {
 623                 micalg = g_strdup(gpgme_hash_algo_name(
 624                             result->signatures->hash_algo));
 625             }
 626         } else {
 627             /* can't get result (maybe no signing key?) */
 628             debug_print("gpgme_op_sign_result error\n");
 629             return FALSE;
 630         }
 631
 632         gpgme_release(ctx);
 633         sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
 634         gpgme_data_release(gpgtext);
 635         g_free(textstr);
 636
 637         if (!sigcontent) {
 638                 gpgme_release(ctx);
 639                 g_free(micalg);
 640                 return FALSE;
 641         }
 642         real_content = sigcontent+strlen("-----BEGIN SIGNED MESSAGE-----\n");
 643         if (!strstr(real_content, "-----END SIGNED MESSAGE-----")) {
 644                 debug_print("missing end\n");
 645                 gpgme_release(ctx);
 646                 g_free(micalg);
 647                 return FALSE;
 648         }
 649         *strstr(real_content, "-----END SIGNED MESSAGE-----") = '\0';
 650         /* add signature */
 651         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
 652                             micalg);
 653
 654         newinfo = procmime_mimeinfo_new();
 655         newinfo->type = MIMETYPE_APPLICATION;
 656         newinfo->subtype = g_strdup("pkcs7-signature");
 657         g_hash_table_insert(newinfo->typeparameters, g_strdup("name"),
 658                              g_strdup("smime.p7s"));
 659         newinfo->content = MIMECONTENT_MEM;
 660         newinfo->disposition = DISPOSITIONTYPE_ATTACHMENT;
 661         g_hash_table_insert(newinfo->dispositionparameters, g_strdup("filename"),
 662                             g_strdup("smime.p7s"));
 663         newinfo->data.mem = g_malloc(len + 1);
 664         g_memmove(newinfo->data.mem, real_content, len);
 665         newinfo->data.mem[len] = '\0';
 666         newinfo->encoding_type = ENC_BASE64;
 667         g_node_append(sigmultipart->node, newinfo->node);
 668
 669         g_free(sigcontent);
 670
 671         return TRUE;
 672 }
 673 gchar *smime_get_encrypt_data(GSList *recp_names)
 674 {
 675         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_CMS);
 676 }
 677
 678 static const gchar *smime_get_encrypt_warning(void)
 679 {
 680         if (prefs_gpg_should_skip_encryption_warning(smime_system.id))
 681                 return NULL;
 682         else
 683                 return _("Please note that email headers, like Subject, "
 684                          "are not encrypted by the S/MIME system.");
 685 }
 686
 687 static void smime_inhibit_encrypt_warning(gboolean inhibit)
 688 {
 689         if (inhibit)
 690                 prefs_gpg_add_skip_encryption_warning(smime_system.id);
 691         else
 692                 prefs_gpg_remove_skip_encryption_warning(smime_system.id);
 693 }
 694
 695 static gchar *fp_read_noconv(FILE *fp)
 696 {
 697         GByteArray *array;
 698         guchar buf[BUFSIZ];
 699         gint n_read;
 700         gchar *result = NULL;
 701
 702         if (!fp)
 703                 return NULL;
 704         array = g_byte_array_new();
 705
 706         while ((n_read = fread(buf, sizeof(gchar), sizeof(buf), fp)) > 0) {
 707                 if (n_read < sizeof(buf) && ferror(fp))
 708                         break;
 709                 g_byte_array_append(array, buf, n_read);
 710         }
 711
 712         if (ferror(fp)) {
 713                 FILE_OP_ERROR("file stream", "fread");
 714                 g_byte_array_free(array, TRUE);
 715                 return NULL;
 716         }
 717
 718         buf[0] = '\0';
 719         g_byte_array_append(array, buf, 1);
 720         result = (gchar *)array->data;
 721         g_byte_array_free(array, FALSE);
 722
 723         return result;
 724 }
 725
 726 gboolean smime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
 727 {
 728         MimeInfo *msgcontent, *encmultipart;
 729         FILE *fp;
 730         gchar *enccontent;
 731         size_t len;
 732         gchar *textstr = NULL;
 733         gpgme_data_t gpgtext = NULL, gpgenc = NULL;
 734         gpgme_ctx_t ctx = NULL;
 735         gpgme_key_t *kset = NULL;
 736         gchar **fprs = g_strsplit(encrypt_data, " ", -1);
 737         gint i = 0;
 738         gpgme_error_t err;
 739         gchar *tmpfile = NULL;
 740
 741         while (fprs[i] && strlen(fprs[i])) {
 742                 i++;
 743         }
 744
 745         gpgme_new(&ctx);
 746
 747         err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
 748
 749         if (err) {
 750                 debug_print ("gpgme_set_protocol failed: %s\n",
 751                    gpgme_strerror (err));
 752                 return FALSE;
 753         }
 754
 755         kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
 756         memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
 757         i = 0;
 758
 759         while (fprs[i] && strlen(fprs[i])) {
 760                 gpgme_key_t key;
 761                 gpgme_error_t err;
 762                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
 763                 if (err) {
 764                         debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
 765                         break;
 766                 }
 767                 debug_print("found %s at %d\n", fprs[i], i);
 768                 kset[i] = key;
 769                 i++;
 770         }
 771
 772         debug_print("Encrypting message content\n");
 773
 774         /* remove content node from message */
 775         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 776         g_node_unlink(msgcontent->node);
 777
 778
 779         /* create temporary multipart for content */
 780         encmultipart = procmime_mimeinfo_new();
 781         encmultipart->type = MIMETYPE_APPLICATION;
 782         encmultipart->subtype = g_strdup("x-pkcs7-mime");
 783         g_hash_table_insert(encmultipart->typeparameters, g_strdup("name"),
 784                             g_strdup("smime.p7m"));
 785         g_hash_table_insert(encmultipart->typeparameters,
 786                             g_strdup("smime-type"),
 787                             g_strdup("enveloped-data"));
 788
 789         encmultipart->disposition = DISPOSITIONTYPE_ATTACHMENT;
 790         g_hash_table_insert(encmultipart->dispositionparameters, g_strdup("filename"),
 791                             g_strdup("smime.p7m"));
 792
 793         g_node_append(encmultipart->node, msgcontent->node);
 794
 795         /* write message content to temporary file */
 796         tmpfile = get_tmp_file();
 797         fp = g_fopen(tmpfile, "wb");
 798         if (fp == NULL) {
 799                 perror("get_tmp_file");
 800                 g_free(kset);
 801                 return FALSE;
 802         }
 803         procmime_decode_content(msgcontent);
 804         procmime_write_mime_header(msgcontent, fp);
 805         procmime_write_mimeinfo(msgcontent, fp);
 806         fclose(fp);
 807         canonicalize_file_replace(tmpfile);
 808         fp = g_fopen(tmpfile, "rb");
 809         if (fp == NULL) {
 810                 perror("get_tmp_file");
 811                 g_free(kset);
 812                 return FALSE;
 813         }
 814         g_free(tmpfile);
 815
 816         /* read temporary file into memory */
 817         textstr = fp_read_noconv(fp);
 818
 819         fclose(fp);
 820
 821         /* encrypt data */
 822         gpgme_data_new_from_mem(&gpgtext, textstr, textstr?strlen(textstr):0, 0);
 823         gpgme_data_new(&gpgenc);
 824         cm_gpgme_data_rewind(gpgtext);
 825
 826         gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
 827
 828         gpgme_release(ctx);
 829         g_free(kset);
 830         enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
 831
 832         if (!enccontent) {
 833                 g_warning("no enccontent\n");
 834                 return FALSE;
 835         }
 836
 837         tmpfile = get_tmp_file();
 838         fp = g_fopen(tmpfile, "wb");
 839         if (fp) {
 840                 if (fwrite(enccontent, 1, len, fp) < len) {
 841                         FILE_OP_ERROR(tmpfile, "fwrite");
 842                         fclose(fp);
 843                         claws_unlink(tmpfile);
 844                         g_free(tmpfile);
 845                         return FALSE;
 846                 }
 847                 if (fclose(fp) == EOF) {
 848                         FILE_OP_ERROR(tmpfile, "fclose");
 849                         claws_unlink(tmpfile);
 850                         g_free(tmpfile);
 851                         return FALSE;
 852                 }
 853         } else {
 854                 perror("get_tmp_file");
 855                 g_free(tmpfile);
 856                 return FALSE;
 857         }
 858         gpgme_data_release(gpgtext);
 859         g_free(textstr);
 860
 861         /* create encrypted multipart */
 862         procmime_mimeinfo_free_all(msgcontent);
 863         g_node_append(mimeinfo->node, encmultipart->node);
 864
 865         encmultipart->content = MIMECONTENT_FILE;
 866         encmultipart->data.filename = tmpfile;
 867         procmime_encode_content(encmultipart, ENC_BASE64);
 868
 869         g_free(enccontent);
 870
 871         return TRUE;
 872 }
 873
 874 static PrivacySystem smime_system = {
 875         "smime",                        /* id */
 876         "S-MIME",                       /* name */
 877
 878         smime_free_privacydata, /* free_privacydata */
 879
 880         smime_is_signed,                /* is_signed(MimeInfo *) */
 881         smime_check_signature,  /* check_signature(MimeInfo *) */
 882         smime_get_sig_status,           /* get_sig_status(MimeInfo *) */
 883         smime_get_sig_info_short,       /* get_sig_info_short(MimeInfo *) */
 884         smime_get_sig_info_full,        /* get_sig_info_full(MimeInfo *) */
 885
 886         smime_is_encrypted,             /* is_encrypted(MimeInfo *) */
 887         smime_decrypt,                  /* decrypt(MimeInfo *) */
 888
 889         TRUE,
 890         smime_sign,
 891
 892         TRUE,
 893         smime_get_encrypt_data,
 894         smime_encrypt,
 895         smime_get_encrypt_warning,
 896         smime_inhibit_encrypt_warning,
 897         prefs_gpg_auto_check_signatures,
 898 };
 899
 900 void smime_init()
 901 {
 902         privacy_register_system(&smime_system);
 903 }
 904
 905 void smime_done()
 906 {
 907         privacy_unregister_system(&smime_system);
 908 }
 909
 910 struct PluginFeature *plugin_provides(void)
 911 {
 912         static struct PluginFeature features[] =
 913                 { {PLUGIN_PRIVACY, N_("S/MIME")},
 914                   {PLUGIN_NOTHING, NULL}};
 915         return features;
 916 }
 917 #endif /* USE_GPGME */