src/plugins/smime/smime.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2007 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 #endif
  24
  25 #ifdef USE_GPGME
  26
  27 #include "defs.h"
  28 #include <glib.h>
  29 #include <gpgme.h>
  30 #include <ctype.h>
  31 #include <glib/gi18n.h>
  32
  33 #include "utils.h"
  34 #include "privacy.h"
  35 #include "procmime.h"
  36
  37 #include "smime.h"
  38 #include <plugins/pgpcore/sgpgme.h>
  39 #include <plugins/pgpcore/prefs_gpg.h>
  40 #include <plugins/pgpcore/passphrase.h>
  41
  42 #include "alertpanel.h"
  43 #include "prefs_common.h"
  44 #include "procmime.h"
  45 #include "plugin.h"
  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 smime_system;
  60
  61 static gint smime_check_signature(MimeInfo *mimeinfo);
  62
  63 static PrivacyDataPGP *smime_new_privacydata()
  64 {
  65         PrivacyDataPGP *data;
  66
  67         data = g_new0(PrivacyDataPGP, 1);
  68         data->data.system = &smime_system;
  69         data->done_sigtest = FALSE;
  70         data->is_signed = FALSE;
  71         data->sigstatus = NULL;
  72         gpgme_new(&data->ctx);
  73
  74         return data;
  75 }
  76
  77 static void smime_free_privacydata(PrivacyData *_data)
  78 {
  79         PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
  80         gpgme_release(data->ctx);
  81         g_free(data);
  82 }
  83
  84 static gboolean smime_is_signed(MimeInfo *mimeinfo)
  85 {
  86         MimeInfo *parent;
  87         MimeInfo *signature;
  88         const gchar *protocol, *tmpstr;
  89         PrivacyDataPGP *data = NULL;
  90
  91         g_return_val_if_fail(mimeinfo != NULL, FALSE);
  92         if (mimeinfo->privacy != NULL) {
  93                 data = (PrivacyDataPGP *) mimeinfo->privacy;
  94                 if (data->done_sigtest)
  95                         return data->is_signed;
  96         }
  97
  98         if (!g_ascii_strcasecmp(mimeinfo->subtype, "pkcs7-mime") ||
  99             !g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
 100                 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
 101                 if (tmpstr && !g_ascii_strcasecmp(tmpstr, "signed-data")) {
 102                         if (data == NULL) {
 103                                 data = smime_new_privacydata();
 104                                 mimeinfo->privacy = (PrivacyData *) data;
 105                         }
 106
 107                         data->done_sigtest = TRUE;
 108                         data->is_signed = TRUE;
 109                         smime_check_signature(mimeinfo);
 110                         return TRUE;
 111                 }
 112         }
 113
 114         /* check parent */
 115         parent = procmime_mimeinfo_parent(mimeinfo);
 116         if (parent == NULL)
 117                 return FALSE;
 118
 119         if ((parent->type != MIMETYPE_MULTIPART) ||
 120             g_ascii_strcasecmp(parent->subtype, "signed"))
 121                 return FALSE;
 122         protocol = procmime_mimeinfo_get_parameter(parent, "protocol");
 123         if ((protocol == NULL) ||
 124             (g_ascii_strcasecmp(protocol, "application/pkcs7-signature") &&
 125              g_ascii_strcasecmp(protocol, "application/x-pkcs7-signature")))
 126                 return FALSE;
 127
 128         /* check if mimeinfo is the first child */
 129         if (parent->node->children->data != mimeinfo)
 130                 return FALSE;
 131
 132
 133         /* check signature */
 134         signature = parent->node->children->next != NULL ?
 135             (MimeInfo *) parent->node->children->next->data : NULL;
 136         if (signature == NULL)
 137                 return FALSE;
 138         if ((signature->type != MIMETYPE_APPLICATION) ||
 139             (g_ascii_strcasecmp(signature->subtype, "pkcs7-signature") &&
 140              g_ascii_strcasecmp(signature->subtype, "x-pkcs7-signature")))
 141                 return FALSE;
 142
 143         if (data == NULL) {
 144                 data = smime_new_privacydata();
 145                 mimeinfo->privacy = (PrivacyData *) data;
 146         }
 147
 148         data->done_sigtest = TRUE;
 149         data->is_signed = TRUE;
 150
 151         return TRUE;
 152 }
 153
 154 static gchar *get_canonical_content(FILE *fp, const gchar *boundary)
 155 {
 156         gchar *ret;
 157         GString *textbuffer;
 158         guint boundary_len = 0;
 159         gchar buf[BUFFSIZE];
 160
 161         if (boundary) {
 162                 boundary_len = strlen(boundary);
 163                 while (fgets(buf, sizeof(buf), fp) != NULL)
 164                         if (IS_BOUNDARY(buf, boundary, boundary_len))
 165                                 break;
 166         }
 167
 168         textbuffer = g_string_new("");
 169         while (fgets(buf, sizeof(buf), fp) != NULL) {
 170                 gchar *buf2;
 171
 172                 if (boundary && IS_BOUNDARY(buf, boundary, boundary_len))
 173                         break;
 174
 175                 buf2 = canonicalize_str(buf);
 176                 g_string_append(textbuffer, buf2);
 177                 g_free(buf2);
 178         }
 179         g_string_truncate(textbuffer, textbuffer->len - 2);
 180
 181         ret = textbuffer->str;
 182         g_string_free(textbuffer, FALSE);
 183
 184         return ret;
 185 }
 186
 187 static gint smime_check_signature(MimeInfo *mimeinfo)
 188 {
 189         PrivacyDataPGP *data;
 190         MimeInfo *parent, *signature;
 191         FILE *fp;
 192         gchar *boundary;
 193         gchar *textstr = NULL;
 194         const gchar *tmpstr;
 195         gpgme_data_t sigdata = NULL, textdata = NULL;
 196         gpgme_error_t err;
 197         g_return_val_if_fail(mimeinfo != NULL, -1);
 198         g_return_val_if_fail(mimeinfo->privacy != NULL, -1);
 199         data = (PrivacyDataPGP *) mimeinfo->privacy;
 200         gpgme_new(&data->ctx);
 201         EncodingType oldenc = ENC_BINARY;
 202
 203         debug_print("Checking S/MIME signature\n");
 204
 205         err = gpgme_set_protocol(data->ctx, GPGME_PROTOCOL_CMS);
 206
 207         if (err) {
 208                 debug_print ("gpgme_set_protocol failed: %s\n",
 209                    gpgme_strerror (err));
 210         }
 211         parent = procmime_mimeinfo_parent(mimeinfo);
 212
 213         fp = g_fopen(parent->data.filename, "rb");
 214         g_return_val_if_fail(fp != NULL, SIGNATURE_INVALID);
 215
 216         boundary = g_hash_table_lookup(parent->typeparameters, "boundary");
 217         if (!boundary) {
 218                 gchar *tmpfile = get_tmp_file();
 219                 debug_print("no boundary\n");
 220                 if (tmpfile) {
 221                         if (mimeinfo->encoding_type != ENC_BASE64) {
 222                                 procmime_encode_content(mimeinfo, ENC_BASE64);
 223                         }
 224                         oldenc = mimeinfo->encoding_type;
 225                         if (mimeinfo->encoding_type == ENC_BASE64)
 226                                 mimeinfo->encoding_type = ENC_BINARY;
 227                         if (procmime_get_part(tmpfile, mimeinfo) == 0) {
 228                                 textstr = file_read_to_str(tmpfile);
 229                         } else {
 230                                 textstr = NULL;
 231                         }
 232                         if (mimeinfo->encoding_type != oldenc)
 233                                 mimeinfo->encoding_type = oldenc;
 234                 }
 235                 g_free(tmpfile);
 236         } else {
 237                 textstr = get_canonical_content(fp, boundary);
 238         }
 239         err = gpgme_data_new_from_mem(&textdata, textstr, strlen(textstr), 0);
 240
 241         if (err) {
 242                 debug_print ("gpgme_data_new_from_mem failed: %s\n",
 243                    gpgme_strerror (err));
 244         }
 245
 246         if (!g_ascii_strcasecmp(mimeinfo->subtype, "pkcs7-mime") ||
 247             !g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
 248                 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
 249                 if (tmpstr && !g_ascii_strcasecmp(tmpstr, "signed-data")) {
 250                         gpgme_data_t cipher;
 251                         size_t len;
 252                         if (oldenc == ENC_BASE64)
 253                                 gpgme_data_set_encoding (textdata, GPGME_DATA_ENCODING_BASE64);
 254                         gpgme_data_new(&cipher);
 255                         data->sigstatus =
 256                                 sgpgme_verify_signature (data->ctx, textdata, NULL, cipher);
 257                         gpgme_data_release(textdata);
 258                         g_free(textstr);
 259                         gpgme_data_rewind(cipher);
 260                         textstr = sgpgme_data_release_and_get_mem(cipher, &len);
 261                         fclose(fp);
 262                         if (textstr && len > 0)
 263                                 textstr[len-1]='\0';
 264
 265                         if (textstr && len) {
 266                                 gchar *tmp_file = get_tmp_file();
 267                                 MimeInfo *newinfo = NULL, *decinfo = NULL, *parentinfo = NULL;
 268                                 gint childnumber = 0;
 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                                 g_node_unlink(decinfo->node);
 275                                 procmime_mimeinfo_free_all(newinfo);
 276                                 decinfo->tmp = TRUE;
 277                                 parentinfo = procmime_mimeinfo_parent(mimeinfo);
 278                                 childnumber = g_node_child_index(parentinfo->node, mimeinfo);
 279                                 if (parentinfo->type == MIMETYPE_MESSAGE &&
 280                                     !strcmp(parentinfo->subtype, "rfc822")) {
 281                                         procmime_decode_content(parentinfo);
 282                                         procmime_encode_content(parentinfo, ENC_BASE64);
 283                                         procmime_encode_content(parentinfo, ENC_8BIT);
 284                                         if (parentinfo->content == MIMECONTENT_MEM) {
 285                                                 gint newlen =
 286                                                         (gint)(strstr(parentinfo->data.mem, "\n\n") - parentinfo->data.mem);
 287                                                 if (newlen > 0)
 288                                                         parentinfo->length = newlen;
 289                                         }
 290                                 }
 291                                 g_node_prepend(parentinfo->node, decinfo->node);
 292                                 return 0;
 293                         } else {
 294                                 return -1;
 295                         }
 296                 }
 297         }
 298
 299         signature = (MimeInfo *) mimeinfo->node->next->data;
 300         sigdata = sgpgme_data_from_mimeinfo(signature);
 301
 302         err = 0;
 303         if (signature->encoding_type == ENC_BASE64) {
 304                 err = gpgme_data_set_encoding (sigdata, GPGME_DATA_ENCODING_BASE64);
 305         }
 306
 307         if (err) {
 308                 debug_print ("gpgme_data_set_encoding failed: %s\n",
 309                         gpgme_strerror (err));
 310         }
 311
 312         data->sigstatus =
 313                 sgpgme_verify_signature (data->ctx, sigdata, textdata, NULL);
 314
 315         gpgme_data_release(sigdata);
 316         gpgme_data_release(textdata);
 317         g_free(textstr);
 318         fclose(fp);
 319
 320         return 0;
 321 }
 322
 323 static SignatureStatus smime_get_sig_status(MimeInfo *mimeinfo)
 324 {
 325         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 326
 327         g_return_val_if_fail(data != NULL, SIGNATURE_INVALID);
 328
 329         if (data->sigstatus == NULL &&
 330             prefs_gpg_get_config()->auto_check_signatures)
 331                 smime_check_signature(mimeinfo);
 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         g_return_val_if_fail(data != NULL, g_strdup("Error"));
 341
 342         if (data->sigstatus == NULL &&
 343             prefs_gpg_get_config()->auto_check_signatures)
 344                 smime_check_signature(mimeinfo);
 345
 346         return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
 347 }
 348
 349 static gchar *smime_get_sig_info_full(MimeInfo *mimeinfo)
 350 {
 351         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 352
 353         g_return_val_if_fail(data != NULL, g_strdup("Error"));
 354
 355         if (data->sigstatus == NULL &&
 356             prefs_gpg_get_config()->auto_check_signatures)
 357                 smime_check_signature(mimeinfo);
 358
 359         return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
 360 }
 361
 362 static gboolean smime_is_encrypted(MimeInfo *mimeinfo)
 363 {
 364         const gchar *tmpstr;
 365
 366         if (mimeinfo->type != MIMETYPE_APPLICATION)
 367                 return FALSE;
 368         if (!g_ascii_strcasecmp(mimeinfo->subtype, "pkcs7-mime")) {
 369                 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
 370                 if (tmpstr && g_ascii_strcasecmp(tmpstr, "enveloped-data"))
 371                         return FALSE;
 372                 else
 373                         return TRUE;
 374
 375         } else if (!g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
 376                 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
 377                 if (tmpstr && g_ascii_strcasecmp(tmpstr, "enveloped-data"))
 378                         return FALSE;
 379                 else
 380                         return TRUE;
 381         }
 382         return FALSE;
 383 }
 384
 385 static MimeInfo *smime_decrypt(MimeInfo *mimeinfo)
 386 {
 387         MimeInfo *encinfo, *decinfo, *parseinfo;
 388         gpgme_data_t cipher = NULL, plain = NULL;
 389         static gint id = 0;
 390         FILE *dstfp;
 391         gchar *fname;
 392         gpgme_verify_result_t sigstat = NULL;
 393         PrivacyDataPGP *data = NULL;
 394         gpgme_ctx_t ctx;
 395         gpgme_error_t err;
 396         gchar *chars;
 397         size_t len;
 398
 399         g_return_val_if_fail(smime_is_encrypted(mimeinfo), NULL);
 400
 401         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 402                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 403                 return NULL;
 404         }
 405
 406         err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
 407         if (err) {
 408                 debug_print ("gpgme_set_protocol failed: %s\n",
 409                    gpgme_strerror (err));
 410                 privacy_set_error(_("Couldn't set GPG protocol, %s"), gpgme_strerror(err));
 411                 gpgme_release(ctx);
 412                 return NULL;
 413         }
 414         gpgme_set_armor(ctx, TRUE);
 415
 416         encinfo = mimeinfo;
 417
 418         cipher = sgpgme_data_from_mimeinfo(encinfo);
 419         gpgme_data_set_encoding(cipher, GPGME_DATA_ENCODING_BASE64);
 420         plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
 421
 422         gpgme_data_release(cipher);
 423         if (plain == NULL) {
 424                 debug_print("plain is null!\n");
 425                 gpgme_release(ctx);
 426                 return NULL;
 427         }
 428
 429         fname = g_strdup_printf("%s%cplaintext.%08x",
 430                 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
 431
 432         if ((dstfp = g_fopen(fname, "wb")) == NULL) {
 433                 FILE_OP_ERROR(fname, "fopen");
 434                 g_free(fname);
 435                 gpgme_data_release(plain);
 436                 gpgme_release(ctx);
 437                 debug_print("can't open!\n");
 438                 privacy_set_error(_("Couldn't open temporary file"));
 439                 return NULL;
 440         }
 441
 442         if (fprintf(dstfp, "MIME-Version: 1.0\n") < 0) {
 443                 FILE_OP_ERROR(fname, "fprintf");
 444                 g_free(fname);
 445                 gpgme_data_release(plain);
 446                 gpgme_release(ctx);
 447                 debug_print("can't close!\n");
 448                 privacy_set_error(_("Couldn't write to temporary file"));
 449                 return NULL;
 450         }
 451
 452         chars = sgpgme_data_release_and_get_mem(plain, &len);
 453
 454         if (len > 0) {
 455                 if (fwrite(chars, 1, len, dstfp) < len) {
 456                         FILE_OP_ERROR(fname, "fwrite");
 457                         g_free(fname);
 458                         g_free(chars);
 459                         gpgme_data_release(plain);
 460                         gpgme_release(ctx);
 461                         debug_print("can't write!\n");
 462                         privacy_set_error(_("Couldn't write to temporary file"));
 463                         return NULL;
 464                 }
 465         }
 466         if (fclose(dstfp) == EOF) {
 467                 FILE_OP_ERROR(fname, "fclose");
 468                 g_free(fname);
 469                 g_free(chars);
 470                 gpgme_data_release(plain);
 471                 gpgme_release(ctx);
 472                 debug_print("can't close!\n");
 473                 privacy_set_error(_("Couldn't close temporary file"));
 474                 return NULL;
 475         }
 476         g_free(chars);
 477
 478         parseinfo = procmime_scan_file(fname);
 479         g_free(fname);
 480         if (parseinfo == NULL) {
 481                 privacy_set_error(_("Couldn't parse decrypted file."));
 482                 gpgme_release(ctx);
 483                 return NULL;
 484         }
 485         decinfo = g_node_first_child(parseinfo->node) != NULL ?
 486                 g_node_first_child(parseinfo->node)->data : NULL;
 487         if (decinfo == NULL) {
 488                 privacy_set_error(_("Couldn't parse decrypted file parts."));
 489                 gpgme_release(ctx);
 490                 return NULL;
 491         }
 492
 493         g_node_unlink(decinfo->node);
 494         procmime_mimeinfo_free_all(parseinfo);
 495
 496         decinfo->tmp = TRUE;
 497
 498         if (sigstat != NULL && sigstat->signatures != NULL) {
 499                 if (decinfo->privacy != NULL) {
 500                         data = (PrivacyDataPGP *) decinfo->privacy;
 501                 } else {
 502                         data = smime_new_privacydata();
 503                         decinfo->privacy = (PrivacyData *) data;
 504                 }
 505                 data->done_sigtest = TRUE;
 506                 data->is_signed = TRUE;
 507                 data->sigstatus = sigstat;
 508                 if (data->ctx)
 509                         gpgme_release(data->ctx);
 510                 data->ctx = ctx;
 511         } else
 512                 gpgme_release(ctx);
 513
 514
 515
 516         return decinfo;
 517 }
 518
 519 gboolean smime_sign(MimeInfo *mimeinfo, PrefsAccount *account)
 520 {
 521         MimeInfo *msgcontent, *sigmultipart, *newinfo;
 522         gchar *textstr, *micalg;
 523         FILE *fp;
 524         gchar *boundary = NULL;
 525         gchar *sigcontent;
 526         gpgme_ctx_t ctx;
 527         gpgme_data_t gpgtext, gpgsig;
 528         gpgme_error_t err;
 529         size_t len;
 530         struct passphrase_cb_info_s info;
 531         gpgme_sign_result_t result = NULL;
 532         gchar *test_msg;
 533         gchar *real_content = NULL;
 534
 535         fp = my_tmpfile();
 536         if (fp == NULL) {
 537                 perror("my_tmpfile");
 538                 return FALSE;
 539         }
 540         procmime_write_mimeinfo(mimeinfo, fp);
 541         rewind(fp);
 542
 543         /* read temporary file into memory */
 544         test_msg = file_read_stream_to_str(fp);
 545         fclose(fp);
 546
 547         memset (&info, 0, sizeof info);
 548
 549         /* remove content node from message */
 550         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 551         g_node_unlink(msgcontent->node);
 552
 553         /* create temporary multipart for content */
 554         sigmultipart = procmime_mimeinfo_new();
 555         sigmultipart->type = MIMETYPE_MULTIPART;
 556         sigmultipart->subtype = g_strdup("signed");
 557
 558         do {
 559                 if (boundary)
 560                         g_free(boundary);
 561                 boundary = generate_mime_boundary("Sig");
 562         } while (strstr(test_msg, boundary) != NULL);
 563
 564         g_free(test_msg);
 565
 566         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
 567                             g_strdup(boundary));
 568         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("protocol"),
 569                             g_strdup("application/pkcs7-signature"));
 570         g_node_append(sigmultipart->node, msgcontent->node);
 571         g_node_append(mimeinfo->node, sigmultipart->node);
 572
 573         /* write message content to temporary file */
 574         fp = my_tmpfile();
 575         if (fp == NULL) {
 576                 perror("my_tmpfile");
 577                 return FALSE;
 578         }
 579         procmime_write_mimeinfo(sigmultipart, fp);
 580         rewind(fp);
 581
 582         /* read temporary file into memory */
 583         textstr = get_canonical_content(fp, boundary);
 584
 585         g_free(boundary);
 586
 587         fclose(fp);
 588
 589         gpgme_data_new_from_mem(&gpgtext, textstr, strlen(textstr), 0);
 590         gpgme_data_new(&gpgsig);
 591         gpgme_new(&ctx);
 592         gpgme_set_armor(ctx, TRUE);
 593         gpgme_signers_clear (ctx);
 594
 595         err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
 596
 597         if (err) {
 598                 debug_print ("gpgme_set_protocol failed: %s\n",
 599                    gpgme_strerror (err));
 600                 gpgme_data_release(gpgtext);
 601                 gpgme_release(ctx);
 602                 return FALSE;
 603         }
 604
 605         if (!sgpgme_setup_signers(ctx, account)) {
 606                 debug_print("setup_signers failed\n");
 607                 gpgme_data_release(gpgtext);
 608                 gpgme_release(ctx);
 609                 return FALSE;
 610         }
 611
 612         info.c = ctx;
 613         prefs_gpg_enable_agent(TRUE);
 614         gpgme_set_passphrase_cb (ctx, NULL, &info);
 615
 616         err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_DETACH);
 617         if (err != GPG_ERR_NO_ERROR) {
 618                 alertpanel_error("S/MIME : Cannot sign, %s (%d)", gpg_strerror(err), gpg_err_code(err));
 619                 gpgme_data_release(gpgtext);
 620                 gpgme_release(ctx);
 621                 return FALSE;
 622         }
 623         result = gpgme_op_sign_result(ctx);
 624         if (result && result->signatures) {
 625             if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 626                 micalg = g_strdup_printf("PGP-%s", gpgme_hash_algo_name(
 627                             result->signatures->hash_algo));
 628             } else {
 629                 micalg = g_strdup(gpgme_hash_algo_name(
 630                             result->signatures->hash_algo));
 631             }
 632         } else {
 633             /* can't get result (maybe no signing key?) */
 634             debug_print("gpgme_op_sign_result error\n");
 635             return FALSE;
 636         }
 637
 638         gpgme_release(ctx);
 639         sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
 640         gpgme_data_release(gpgtext);
 641         g_free(textstr);
 642
 643         if (!sigcontent) {
 644                 gpgme_release(ctx);
 645                 return FALSE;
 646         }
 647         real_content = sigcontent+strlen("-----BEGIN SIGNED MESSAGE-----\n");
 648         if (!strstr(real_content, "-----END SIGNED MESSAGE-----")) {
 649                 debug_print("missing end\n");
 650                 gpgme_release(ctx);
 651                 return FALSE;
 652         }
 653         *strstr(real_content, "-----END SIGNED MESSAGE-----") = '\0';
 654         /* add signature */
 655         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
 656                             micalg);
 657
 658         newinfo = procmime_mimeinfo_new();
 659         newinfo->type = MIMETYPE_APPLICATION;
 660         newinfo->subtype = g_strdup("pkcs7-signature");
 661         g_hash_table_insert(newinfo->typeparameters, g_strdup("name"),
 662                              g_strdup("smime.p7s"));
 663         newinfo->content = MIMECONTENT_MEM;
 664         newinfo->disposition = DISPOSITIONTYPE_ATTACHMENT;
 665         g_hash_table_insert(newinfo->dispositionparameters, g_strdup("filename"),
 666                             g_strdup("smime.p7s"));
 667         newinfo->data.mem = g_malloc(len + 1);
 668         g_memmove(newinfo->data.mem, real_content, len);
 669         newinfo->data.mem[len] = '\0';
 670         newinfo->encoding_type = ENC_BASE64;
 671         g_node_append(sigmultipart->node, newinfo->node);
 672
 673         g_free(sigcontent);
 674
 675         return TRUE;
 676 }
 677 gchar *smime_get_encrypt_data(GSList *recp_names)
 678 {
 679         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_CMS);
 680 }
 681
 682 static const gchar *smime_get_encrypt_warning(void)
 683 {
 684         if (prefs_gpg_should_skip_encryption_warning(smime_system.id))
 685                 return NULL;
 686         else
 687                 return _("Please note that email headers, like Subject, "
 688                          "are not encrypted by the S/MIME system.");
 689 }
 690
 691 static void smime_inhibit_encrypt_warning(gboolean inhibit)
 692 {
 693         if (inhibit)
 694                 prefs_gpg_add_skip_encryption_warning(smime_system.id);
 695         else
 696                 prefs_gpg_remove_skip_encryption_warning(smime_system.id);
 697 }
 698
 699 static gchar *fp_read_noconv(FILE *fp)
 700 {
 701         GByteArray *array;
 702         guchar buf[BUFSIZ];
 703         gint n_read;
 704         gchar *result = NULL;
 705
 706         if (!fp)
 707                 return NULL;
 708         array = g_byte_array_new();
 709
 710         while ((n_read = fread(buf, sizeof(gchar), sizeof(buf), fp)) > 0) {
 711                 if (n_read < sizeof(buf) && ferror(fp))
 712                         break;
 713                 g_byte_array_append(array, buf, n_read);
 714         }
 715
 716         if (ferror(fp)) {
 717                 FILE_OP_ERROR("file stream", "fread");
 718                 g_byte_array_free(array, TRUE);
 719                 return NULL;
 720         }
 721
 722         buf[0] = '\0';
 723         g_byte_array_append(array, buf, 1);
 724         result = (gchar *)array->data;
 725         g_byte_array_free(array, FALSE);
 726
 727         return result;
 728 }
 729
 730 gboolean smime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
 731 {
 732         MimeInfo *msgcontent, *encmultipart;
 733         FILE *fp;
 734         gchar *enccontent;
 735         size_t len;
 736         gchar *textstr = NULL;
 737         gpgme_data_t gpgtext = NULL, gpgenc = NULL;
 738         gpgme_ctx_t ctx = NULL;
 739         gpgme_key_t *kset = NULL;
 740         gchar **fprs = g_strsplit(encrypt_data, " ", -1);
 741         gint i = 0;
 742         gpgme_error_t err;
 743         gchar *tmpfile = NULL;
 744
 745         while (fprs[i] && strlen(fprs[i])) {
 746                 i++;
 747         }
 748
 749         gpgme_new(&ctx);
 750
 751         err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
 752
 753         if (err) {
 754                 debug_print ("gpgme_set_protocol failed: %s\n",
 755                    gpgme_strerror (err));
 756                 return FALSE;
 757         }
 758
 759         kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
 760         memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
 761         i = 0;
 762
 763         while (fprs[i] && strlen(fprs[i])) {
 764                 gpgme_key_t key;
 765                 gpgme_error_t err;
 766                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
 767                 if (err) {
 768                         debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
 769                         break;
 770                 }
 771                 debug_print("found %s at %d\n", fprs[i], i);
 772                 kset[i] = key;
 773                 i++;
 774         }
 775
 776         debug_print("Encrypting message content\n");
 777
 778         /* remove content node from message */
 779         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 780         g_node_unlink(msgcontent->node);
 781
 782
 783         /* create temporary multipart for content */
 784         encmultipart = procmime_mimeinfo_new();
 785         encmultipart->type = MIMETYPE_APPLICATION;
 786         encmultipart->subtype = g_strdup("x-pkcs7-mime");
 787         g_hash_table_insert(encmultipart->typeparameters, g_strdup("name"),
 788                             g_strdup("smime.p7m"));
 789
 790         encmultipart->disposition = DISPOSITIONTYPE_ATTACHMENT;
 791         g_hash_table_insert(encmultipart->dispositionparameters, g_strdup("filename"),
 792                             g_strdup("smime.p7m"));
 793
 794         g_node_append(encmultipart->node, msgcontent->node);
 795
 796         /* write message content to temporary file */
 797         tmpfile = get_tmp_file();
 798         fp = fopen(tmpfile, "wb");
 799         if (fp == NULL) {
 800                 perror("get_tmp_file");
 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 = fopen(tmpfile, "rb");
 809         if (fp == NULL) {
 810                 perror("get_tmp_file");
 811                 return FALSE;
 812         }
 813         g_free(tmpfile);
 814
 815         /* read temporary file into memory */
 816         textstr = fp_read_noconv(fp);
 817
 818         fclose(fp);
 819
 820         /* encrypt data */
 821         gpgme_data_new_from_mem(&gpgtext, textstr, strlen(textstr), 0);
 822         gpgme_data_new(&gpgenc);
 823         gpgme_data_rewind(gpgtext);
 824
 825         gpgme_data_set_encoding(gpgenc, GPGME_DATA_ENCODING_BASE64);
 826         gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
 827
 828         gpgme_release(ctx);
 829         enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
 830
 831         if (!enccontent) {
 832                 g_warning("no enccontent\n");
 833                 return FALSE;
 834         }
 835
 836         tmpfile = get_tmp_file();
 837         fp = fopen(tmpfile, "wb");
 838         if (fp) {
 839                 if (fwrite(enccontent, 1, len, fp) < len) {
 840                         FILE_OP_ERROR(tmpfile, "fwrite");
 841                         fclose(fp);
 842                         claws_unlink(tmpfile);
 843                         g_free(tmpfile);
 844                         return FALSE;
 845                 }
 846                 if (fclose(fp) == EOF) {
 847                         FILE_OP_ERROR(tmpfile, "fclose");
 848                         claws_unlink(tmpfile);
 849                         g_free(tmpfile);
 850                         return FALSE;
 851                 }
 852         } else {
 853                 perror("get_tmp_file");
 854                 g_free(tmpfile);
 855                 return FALSE;
 856         }
 857         gpgme_data_release(gpgtext);
 858         g_free(textstr);
 859
 860         /* create encrypted multipart */
 861         procmime_mimeinfo_free_all(msgcontent);
 862         g_node_append(mimeinfo->node, encmultipart->node);
 863
 864         encmultipart->content = MIMECONTENT_FILE;
 865         encmultipart->data.filename = tmpfile;
 866         procmime_encode_content(encmultipart, ENC_BASE64);
 867
 868         g_free(enccontent);
 869
 870         return TRUE;
 871 }
 872
 873 static PrivacySystem smime_system = {
 874         "smime",                        /* id */
 875         "S-MIME",                       /* name */
 876
 877         smime_free_privacydata, /* free_privacydata */
 878
 879         smime_is_signed,                /* is_signed(MimeInfo *) */
 880         smime_check_signature,  /* check_signature(MimeInfo *) */
 881         smime_get_sig_status,           /* get_sig_status(MimeInfo *) */
 882         smime_get_sig_info_short,       /* get_sig_info_short(MimeInfo *) */
 883         smime_get_sig_info_full,        /* get_sig_info_full(MimeInfo *) */
 884
 885         smime_is_encrypted,             /* is_encrypted(MimeInfo *) */
 886         smime_decrypt,                  /* decrypt(MimeInfo *) */
 887
 888         TRUE,
 889         smime_sign,
 890
 891         TRUE,
 892         smime_get_encrypt_data,
 893         smime_encrypt,
 894         smime_get_encrypt_warning,
 895         smime_inhibit_encrypt_warning,
 896 };
 897
 898 void smime_init()
 899 {
 900         privacy_register_system(&smime_system);
 901 }
 902
 903 void smime_done()
 904 {
 905         privacy_unregister_system(&smime_system);
 906 }
 907
 908 struct PluginFeature *plugin_provides(void)
 909 {
 910         static struct PluginFeature features[] =
 911                 { {PLUGIN_PRIVACY, N_("S/MIME")},
 912                   {PLUGIN_NOTHING, NULL}};
 913         return features;
 914 }
 915 #endif /* USE_GPGME */