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         if (data->sigstatus == NULL &&
 334             prefs_gpg_get_config()->auto_check_signatures)
 335                 smime_check_signature(mimeinfo);
 336
 337         return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
 338 }
 339
 340 static gchar *smime_get_sig_info_short(MimeInfo *mimeinfo)
 341 {
 342         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 343
 344         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 345
 346         if (data->sigstatus == NULL &&
 347             prefs_gpg_get_config()->auto_check_signatures)
 348                 smime_check_signature(mimeinfo);
 349
 350         return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
 351 }
 352
 353 static gchar *smime_get_sig_info_full(MimeInfo *mimeinfo)
 354 {
 355         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 356
 357         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 358
 359         if (data->sigstatus == NULL &&
 360             prefs_gpg_get_config()->auto_check_signatures)
 361                 smime_check_signature(mimeinfo);
 362
 363         return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
 364 }
 365
 366 static gboolean smime_is_encrypted(MimeInfo *mimeinfo)
 367 {
 368         const gchar *tmpstr;
 369
 370         if (mimeinfo->type != MIMETYPE_APPLICATION)
 371                 return FALSE;
 372         if (!g_ascii_strcasecmp(mimeinfo->subtype, "pkcs7-mime")) {
 373                 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
 374                 if (tmpstr && g_ascii_strcasecmp(tmpstr, "enveloped-data"))
 375                         return FALSE;
 376                 else
 377                         return TRUE;
 378
 379         } else if (!g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
 380                 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
 381                 if (tmpstr && g_ascii_strcasecmp(tmpstr, "enveloped-data"))
 382                         return FALSE;
 383                 else
 384                         return TRUE;
 385         }
 386         return FALSE;
 387 }
 388
 389 static MimeInfo *smime_decrypt(MimeInfo *mimeinfo)
 390 {
 391         MimeInfo *encinfo, *decinfo, *parseinfo;
 392         gpgme_data_t cipher = NULL, plain = NULL;
 393         static gint id = 0;
 394         FILE *dstfp;
 395         gchar *fname;
 396         gpgme_verify_result_t sigstat = NULL;
 397         PrivacyDataPGP *data = NULL;
 398         gpgme_ctx_t ctx;
 399         gpgme_error_t err;
 400         gchar *chars;
 401         size_t len;
 402
 403         cm_return_val_if_fail(smime_is_encrypted(mimeinfo), NULL);
 404
 405         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 406                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 407                 return NULL;
 408         }
 409
 410         err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
 411         if (err) {
 412                 debug_print ("gpgme_set_protocol failed: %s\n",
 413                    gpgme_strerror (err));
 414                 privacy_set_error(_("Couldn't set GPG protocol, %s"), gpgme_strerror(err));
 415                 gpgme_release(ctx);
 416                 return NULL;
 417         }
 418         gpgme_set_armor(ctx, TRUE);
 419
 420         encinfo = mimeinfo;
 421
 422         cipher = sgpgme_data_from_mimeinfo(encinfo);
 423
 424         plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
 425
 426         gpgme_data_release(cipher);
 427         if (plain == NULL) {
 428                 debug_print("plain is null!\n");
 429                 gpgme_release(ctx);
 430                 return NULL;
 431         }
 432
 433         fname = g_strdup_printf("%s%cplaintext.%08x",
 434                 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
 435
 436         if ((dstfp = g_fopen(fname, "wb")) == NULL) {
 437                 FILE_OP_ERROR(fname, "g_fopen");
 438                 g_free(fname);
 439                 gpgme_data_release(plain);
 440                 gpgme_release(ctx);
 441                 debug_print("can't open!\n");
 442                 privacy_set_error(_("Couldn't open temporary file"));
 443                 return NULL;
 444         }
 445
 446         if (fprintf(dstfp, "MIME-Version: 1.0\n") < 0) {
 447                 FILE_OP_ERROR(fname, "fprintf");
 448                 g_free(fname);
 449                 fclose(dstfp);
 450                 gpgme_data_release(plain);
 451                 gpgme_release(ctx);
 452                 debug_print("can't close!\n");
 453                 privacy_set_error(_("Couldn't write to temporary file"));
 454                 return NULL;
 455         }
 456
 457         chars = sgpgme_data_release_and_get_mem(plain, &len);
 458
 459         if (len > 0) {
 460                 if (fwrite(chars, 1, len, dstfp) < len) {
 461                         FILE_OP_ERROR(fname, "fwrite");
 462                         fclose(dstfp);
 463                         g_free(fname);
 464                         g_free(chars);
 465                         gpgme_data_release(plain);
 466                         gpgme_release(ctx);
 467                         debug_print("can't write!\n");
 468                         privacy_set_error(_("Couldn't write to temporary file"));
 469                         return NULL;
 470                 }
 471         }
 472         if (fclose(dstfp) == EOF) {
 473                 FILE_OP_ERROR(fname, "fclose");
 474                 g_free(fname);
 475                 g_free(chars);
 476                 gpgme_data_release(plain);
 477                 gpgme_release(ctx);
 478                 debug_print("can't close!\n");
 479                 privacy_set_error(_("Couldn't close temporary file"));
 480                 return NULL;
 481         }
 482         g_free(chars);
 483
 484         parseinfo = procmime_scan_file(fname);
 485         g_free(fname);
 486         if (parseinfo == NULL) {
 487                 privacy_set_error(_("Couldn't parse decrypted file."));
 488                 gpgme_release(ctx);
 489                 return NULL;
 490         }
 491         decinfo = g_node_first_child(parseinfo->node) != NULL ?
 492                 g_node_first_child(parseinfo->node)->data : NULL;
 493         if (decinfo == NULL) {
 494                 privacy_set_error(_("Couldn't parse decrypted file parts."));
 495                 gpgme_release(ctx);
 496                 return NULL;
 497         }
 498
 499         g_node_unlink(decinfo->node);
 500         procmime_mimeinfo_free_all(parseinfo);
 501
 502         decinfo->tmp = TRUE;
 503
 504         if (sigstat != NULL && sigstat->signatures != NULL) {
 505                 if (decinfo->privacy != NULL) {
 506                         data = (PrivacyDataPGP *) decinfo->privacy;
 507                 } else {
 508                         data = smime_new_privacydata();
 509                         decinfo->privacy = (PrivacyData *) data;
 510                 }
 511                 data->done_sigtest = TRUE;
 512                 data->is_signed = TRUE;
 513                 data->sigstatus = sigstat;
 514                 if (data->ctx)
 515                         gpgme_release(data->ctx);
 516                 data->ctx = ctx;
 517         } else
 518                 gpgme_release(ctx);
 519
 520
 521
 522         return decinfo;
 523 }
 524
 525 gboolean smime_sign(MimeInfo *mimeinfo, PrefsAccount *account, const gchar *from_addr)
 526 {
 527         MimeInfo *msgcontent, *sigmultipart, *newinfo;
 528         gchar *textstr, *micalg = NULL;
 529         FILE *fp;
 530         gchar *boundary = NULL;
 531         gchar *sigcontent;
 532         gpgme_ctx_t ctx;
 533         gpgme_data_t gpgtext, gpgsig;
 534         gpgme_error_t err;
 535         size_t len;
 536         struct passphrase_cb_info_s info;
 537         gpgme_sign_result_t result = NULL;
 538         gchar *test_msg;
 539         gchar *real_content = NULL;
 540
 541         fp = my_tmpfile();
 542         if (fp == NULL) {
 543                 perror("my_tmpfile");
 544                 return FALSE;
 545         }
 546         procmime_write_mimeinfo(mimeinfo, fp);
 547         rewind(fp);
 548
 549         /* read temporary file into memory */
 550         test_msg = file_read_stream_to_str(fp);
 551         fclose(fp);
 552
 553         memset (&info, 0, sizeof info);
 554
 555         /* remove content node from message */
 556         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 557         g_node_unlink(msgcontent->node);
 558
 559         /* create temporary multipart for content */
 560         sigmultipart = procmime_mimeinfo_new();
 561         sigmultipart->type = MIMETYPE_MULTIPART;
 562         sigmultipart->subtype = g_strdup("signed");
 563
 564         do {
 565                 if (boundary)
 566                         g_free(boundary);
 567                 boundary = generate_mime_boundary("Sig");
 568         } while (strstr(test_msg, boundary) != NULL);
 569
 570         g_free(test_msg);
 571
 572         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
 573                             g_strdup(boundary));
 574         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("protocol"),
 575                             g_strdup("application/pkcs7-signature"));
 576         g_node_append(sigmultipart->node, msgcontent->node);
 577         g_node_append(mimeinfo->node, sigmultipart->node);
 578
 579         /* write message content to temporary file */
 580         fp = my_tmpfile();
 581         if (fp == NULL) {
 582                 perror("my_tmpfile");
 583                 return FALSE;
 584         }
 585         procmime_write_mimeinfo(sigmultipart, fp);
 586         rewind(fp);
 587
 588         /* read temporary file into memory */
 589         textstr = get_canonical_content(fp, boundary);
 590
 591         g_free(boundary);
 592
 593         fclose(fp);
 594
 595         gpgme_data_new_from_mem(&gpgtext, textstr, textstr?strlen(textstr):0, 0);
 596         gpgme_data_new(&gpgsig);
 597         gpgme_new(&ctx);
 598         gpgme_set_armor(ctx, TRUE);
 599         gpgme_signers_clear (ctx);
 600
 601         err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
 602
 603         if (err) {
 604                 debug_print ("gpgme_set_protocol failed: %s\n",
 605                    gpgme_strerror (err));
 606                 gpgme_data_release(gpgtext);
 607                 gpgme_release(ctx);
 608                 return FALSE;
 609         }
 610
 611         if (!sgpgme_setup_signers(ctx, account, from_addr)) {
 612                 debug_print("setup_signers failed\n");
 613                 gpgme_data_release(gpgtext);
 614                 gpgme_release(ctx);
 615                 return FALSE;
 616         }
 617
 618         info.c = ctx;
 619         prefs_gpg_enable_agent(TRUE);
 620         gpgme_set_passphrase_cb (ctx, NULL, &info);
 621
 622         err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_DETACH);
 623         if (err != GPG_ERR_NO_ERROR) {
 624                 alertpanel_error("S/MIME : Cannot sign, %s (%d)", gpg_strerror(err), gpg_err_code(err));
 625                 gpgme_data_release(gpgtext);
 626                 gpgme_release(ctx);
 627                 return FALSE;
 628         }
 629         result = gpgme_op_sign_result(ctx);
 630         if (result && result->signatures) {
 631             if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 632                 micalg = g_strdup_printf("PGP-%s", gpgme_hash_algo_name(
 633                             result->signatures->hash_algo));
 634             } else {
 635                 micalg = g_strdup(gpgme_hash_algo_name(
 636                             result->signatures->hash_algo));
 637             }
 638         } else {
 639             /* can't get result (maybe no signing key?) */
 640             debug_print("gpgme_op_sign_result error\n");
 641             return FALSE;
 642         }
 643
 644         gpgme_release(ctx);
 645         sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
 646         gpgme_data_release(gpgtext);
 647         g_free(textstr);
 648
 649         if (!sigcontent) {
 650                 gpgme_release(ctx);
 651                 g_free(micalg);
 652                 return FALSE;
 653         }
 654         real_content = sigcontent+strlen("-----BEGIN SIGNED MESSAGE-----\n");
 655         if (!strstr(real_content, "-----END SIGNED MESSAGE-----")) {
 656                 debug_print("missing end\n");
 657                 gpgme_release(ctx);
 658                 g_free(micalg);
 659                 return FALSE;
 660         }
 661         *strstr(real_content, "-----END SIGNED MESSAGE-----") = '\0';
 662         /* add signature */
 663         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
 664                             micalg);
 665
 666         newinfo = procmime_mimeinfo_new();
 667         newinfo->type = MIMETYPE_APPLICATION;
 668         newinfo->subtype = g_strdup("pkcs7-signature");
 669         g_hash_table_insert(newinfo->typeparameters, g_strdup("name"),
 670                              g_strdup("smime.p7s"));
 671         newinfo->content = MIMECONTENT_MEM;
 672         newinfo->disposition = DISPOSITIONTYPE_ATTACHMENT;
 673         g_hash_table_insert(newinfo->dispositionparameters, g_strdup("filename"),
 674                             g_strdup("smime.p7s"));
 675         newinfo->data.mem = g_malloc(len + 1);
 676         g_memmove(newinfo->data.mem, real_content, len);
 677         newinfo->data.mem[len] = '\0';
 678         newinfo->encoding_type = ENC_BASE64;
 679         g_node_append(sigmultipart->node, newinfo->node);
 680
 681         g_free(sigcontent);
 682
 683         return TRUE;
 684 }
 685 gchar *smime_get_encrypt_data(GSList *recp_names)
 686 {
 687         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_CMS);
 688 }
 689
 690 static const gchar *smime_get_encrypt_warning(void)
 691 {
 692         if (prefs_gpg_should_skip_encryption_warning(smime_system.id))
 693                 return NULL;
 694         else
 695                 return _("Please note that email headers, like Subject, "
 696                          "are not encrypted by the S/MIME system.");
 697 }
 698
 699 static void smime_inhibit_encrypt_warning(gboolean inhibit)
 700 {
 701         if (inhibit)
 702                 prefs_gpg_add_skip_encryption_warning(smime_system.id);
 703         else
 704                 prefs_gpg_remove_skip_encryption_warning(smime_system.id);
 705 }
 706
 707 static gchar *fp_read_noconv(FILE *fp)
 708 {
 709         GByteArray *array;
 710         guchar buf[BUFSIZ];
 711         gint n_read;
 712         gchar *result = NULL;
 713
 714         if (!fp)
 715                 return NULL;
 716         array = g_byte_array_new();
 717
 718         while ((n_read = fread(buf, sizeof(gchar), sizeof(buf), fp)) > 0) {
 719                 if (n_read < sizeof(buf) && ferror(fp))
 720                         break;
 721                 g_byte_array_append(array, buf, n_read);
 722         }
 723
 724         if (ferror(fp)) {
 725                 FILE_OP_ERROR("file stream", "fread");
 726                 g_byte_array_free(array, TRUE);
 727                 return NULL;
 728         }
 729
 730         buf[0] = '\0';
 731         g_byte_array_append(array, buf, 1);
 732         result = (gchar *)array->data;
 733         g_byte_array_free(array, FALSE);
 734
 735         return result;
 736 }
 737
 738 gboolean smime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
 739 {
 740         MimeInfo *msgcontent, *encmultipart;
 741         FILE *fp;
 742         gchar *enccontent;
 743         size_t len;
 744         gchar *textstr = NULL;
 745         gpgme_data_t gpgtext = NULL, gpgenc = NULL;
 746         gpgme_ctx_t ctx = NULL;
 747         gpgme_key_t *kset = NULL;
 748         gchar **fprs = g_strsplit(encrypt_data, " ", -1);
 749         gint i = 0;
 750         gpgme_error_t err;
 751         gchar *tmpfile = NULL;
 752
 753         while (fprs[i] && strlen(fprs[i])) {
 754                 i++;
 755         }
 756
 757         gpgme_new(&ctx);
 758
 759         err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
 760
 761         if (err) {
 762                 debug_print ("gpgme_set_protocol failed: %s\n",
 763                    gpgme_strerror (err));
 764                 return FALSE;
 765         }
 766
 767         kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
 768         memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
 769         i = 0;
 770
 771         while (fprs[i] && strlen(fprs[i])) {
 772                 gpgme_key_t key;
 773                 gpgme_error_t err;
 774                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
 775                 if (err) {
 776                         debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
 777                         break;
 778                 }
 779                 debug_print("found %s at %d\n", fprs[i], i);
 780                 kset[i] = key;
 781                 i++;
 782         }
 783
 784         debug_print("Encrypting message content\n");
 785
 786         /* remove content node from message */
 787         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 788         g_node_unlink(msgcontent->node);
 789
 790
 791         /* create temporary multipart for content */
 792         encmultipart = procmime_mimeinfo_new();
 793         encmultipart->type = MIMETYPE_APPLICATION;
 794         encmultipart->subtype = g_strdup("x-pkcs7-mime");
 795         g_hash_table_insert(encmultipart->typeparameters, g_strdup("name"),
 796                             g_strdup("smime.p7m"));
 797         g_hash_table_insert(encmultipart->typeparameters,
 798                             g_strdup("smime-type"),
 799                             g_strdup("enveloped-data"));
 800
 801         encmultipart->disposition = DISPOSITIONTYPE_ATTACHMENT;
 802         g_hash_table_insert(encmultipart->dispositionparameters, g_strdup("filename"),
 803                             g_strdup("smime.p7m"));
 804
 805         g_node_append(encmultipart->node, msgcontent->node);
 806
 807         /* write message content to temporary file */
 808         tmpfile = get_tmp_file();
 809         fp = g_fopen(tmpfile, "wb");
 810         if (fp == NULL) {
 811                 perror("get_tmp_file");
 812                 g_free(kset);
 813                 return FALSE;
 814         }
 815         procmime_decode_content(msgcontent);
 816         procmime_write_mime_header(msgcontent, fp);
 817         procmime_write_mimeinfo(msgcontent, fp);
 818         fclose(fp);
 819         canonicalize_file_replace(tmpfile);
 820         fp = g_fopen(tmpfile, "rb");
 821         if (fp == NULL) {
 822                 perror("get_tmp_file");
 823                 g_free(kset);
 824                 return FALSE;
 825         }
 826         g_free(tmpfile);
 827
 828         /* read temporary file into memory */
 829         textstr = fp_read_noconv(fp);
 830
 831         fclose(fp);
 832
 833         /* encrypt data */
 834         gpgme_data_new_from_mem(&gpgtext, textstr, textstr?strlen(textstr):0, 0);
 835         gpgme_data_new(&gpgenc);
 836         cm_gpgme_data_rewind(gpgtext);
 837
 838         gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
 839
 840         gpgme_release(ctx);
 841         g_free(kset);
 842         enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
 843
 844         if (!enccontent) {
 845                 g_warning("no enccontent\n");
 846                 return FALSE;
 847         }
 848
 849         tmpfile = get_tmp_file();
 850         fp = g_fopen(tmpfile, "wb");
 851         if (fp) {
 852                 if (fwrite(enccontent, 1, len, fp) < len) {
 853                         FILE_OP_ERROR(tmpfile, "fwrite");
 854                         fclose(fp);
 855                         claws_unlink(tmpfile);
 856                         g_free(tmpfile);
 857                         return FALSE;
 858                 }
 859                 if (fclose(fp) == EOF) {
 860                         FILE_OP_ERROR(tmpfile, "fclose");
 861                         claws_unlink(tmpfile);
 862                         g_free(tmpfile);
 863                         return FALSE;
 864                 }
 865         } else {
 866                 perror("get_tmp_file");
 867                 g_free(tmpfile);
 868                 return FALSE;
 869         }
 870         gpgme_data_release(gpgtext);
 871         g_free(textstr);
 872
 873         /* create encrypted multipart */
 874         procmime_mimeinfo_free_all(msgcontent);
 875         g_node_append(mimeinfo->node, encmultipart->node);
 876
 877         encmultipart->content = MIMECONTENT_FILE;
 878         encmultipart->data.filename = tmpfile;
 879         procmime_encode_content(encmultipart, ENC_BASE64);
 880
 881         g_free(enccontent);
 882
 883         return TRUE;
 884 }
 885
 886 static PrivacySystem smime_system = {
 887         "smime",                        /* id */
 888         "S-MIME",                       /* name */
 889
 890         smime_free_privacydata, /* free_privacydata */
 891
 892         smime_is_signed,                /* is_signed(MimeInfo *) */
 893         smime_check_signature,  /* check_signature(MimeInfo *) */
 894         smime_get_sig_status,           /* get_sig_status(MimeInfo *) */
 895         smime_get_sig_info_short,       /* get_sig_info_short(MimeInfo *) */
 896         smime_get_sig_info_full,        /* get_sig_info_full(MimeInfo *) */
 897
 898         smime_is_encrypted,             /* is_encrypted(MimeInfo *) */
 899         smime_decrypt,                  /* decrypt(MimeInfo *) */
 900
 901         TRUE,
 902         smime_sign,
 903
 904         TRUE,
 905         smime_get_encrypt_data,
 906         smime_encrypt,
 907         smime_get_encrypt_warning,
 908         smime_inhibit_encrypt_warning,
 909 };
 910
 911 void smime_init()
 912 {
 913         privacy_register_system(&smime_system);
 914 }
 915
 916 void smime_done()
 917 {
 918         privacy_unregister_system(&smime_system);
 919 }
 920
 921 struct PluginFeature *plugin_provides(void)
 922 {
 923         static struct PluginFeature features[] =
 924                 { {PLUGIN_PRIVACY, N_("S/MIME")},
 925                   {PLUGIN_NOTHING, NULL}};
 926         return features;
 927 }
 928 #endif /* USE_GPGME */