src/plugins/smime/smime.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2009 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         cm_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         cm_return_val_if_fail(mimeinfo != NULL, -1);
 198         cm_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         cm_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, textstr?strlen(textstr):0, 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                         cm_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
 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                                 childnumber = g_node_child_index(parentinfo->node, mimeinfo);
 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                         g_free(fname);
 463                         g_free(chars);
 464                         gpgme_data_release(plain);
 465                         gpgme_release(ctx);
 466                         debug_print("can't write!\n");
 467                         privacy_set_error(_("Couldn't write to temporary file"));
 468                         return NULL;
 469                 }
 470         }
 471         if (fclose(dstfp) == EOF) {
 472                 FILE_OP_ERROR(fname, "fclose");
 473                 g_free(fname);
 474                 g_free(chars);
 475                 gpgme_data_release(plain);
 476                 gpgme_release(ctx);
 477                 debug_print("can't close!\n");
 478                 privacy_set_error(_("Couldn't close temporary file"));
 479                 return NULL;
 480         }
 481         g_free(chars);
 482
 483         parseinfo = procmime_scan_file(fname);
 484         g_free(fname);
 485         if (parseinfo == NULL) {
 486                 privacy_set_error(_("Couldn't parse decrypted file."));
 487                 gpgme_release(ctx);
 488                 return NULL;
 489         }
 490         decinfo = g_node_first_child(parseinfo->node) != NULL ?
 491                 g_node_first_child(parseinfo->node)->data : NULL;
 492         if (decinfo == NULL) {
 493                 privacy_set_error(_("Couldn't parse decrypted file parts."));
 494                 gpgme_release(ctx);
 495                 return NULL;
 496         }
 497
 498         g_node_unlink(decinfo->node);
 499         procmime_mimeinfo_free_all(parseinfo);
 500
 501         decinfo->tmp = TRUE;
 502
 503         if (sigstat != NULL && sigstat->signatures != NULL) {
 504                 if (decinfo->privacy != NULL) {
 505                         data = (PrivacyDataPGP *) decinfo->privacy;
 506                 } else {
 507                         data = smime_new_privacydata();
 508                         decinfo->privacy = (PrivacyData *) data;
 509                 }
 510                 data->done_sigtest = TRUE;
 511                 data->is_signed = TRUE;
 512                 data->sigstatus = sigstat;
 513                 if (data->ctx)
 514                         gpgme_release(data->ctx);
 515                 data->ctx = ctx;
 516         } else
 517                 gpgme_release(ctx);
 518
 519
 520
 521         return decinfo;
 522 }
 523
 524 gboolean smime_sign(MimeInfo *mimeinfo, PrefsAccount *account, const gchar *from_addr)
 525 {
 526         MimeInfo *msgcontent, *sigmultipart, *newinfo;
 527         gchar *textstr, *micalg;
 528         FILE *fp;
 529         gchar *boundary = NULL;
 530         gchar *sigcontent;
 531         gpgme_ctx_t ctx;
 532         gpgme_data_t gpgtext, gpgsig;
 533         gpgme_error_t err;
 534         size_t len;
 535         struct passphrase_cb_info_s info;
 536         gpgme_sign_result_t result = NULL;
 537         gchar *test_msg;
 538         gchar *real_content = NULL;
 539
 540         fp = my_tmpfile();
 541         if (fp == NULL) {
 542                 perror("my_tmpfile");
 543                 return FALSE;
 544         }
 545         procmime_write_mimeinfo(mimeinfo, fp);
 546         rewind(fp);
 547
 548         /* read temporary file into memory */
 549         test_msg = file_read_stream_to_str(fp);
 550         fclose(fp);
 551
 552         memset (&info, 0, sizeof info);
 553
 554         /* remove content node from message */
 555         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 556         g_node_unlink(msgcontent->node);
 557
 558         /* create temporary multipart for content */
 559         sigmultipart = procmime_mimeinfo_new();
 560         sigmultipart->type = MIMETYPE_MULTIPART;
 561         sigmultipart->subtype = g_strdup("signed");
 562
 563         do {
 564                 if (boundary)
 565                         g_free(boundary);
 566                 boundary = generate_mime_boundary("Sig");
 567         } while (strstr(test_msg, boundary) != NULL);
 568
 569         g_free(test_msg);
 570
 571         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
 572                             g_strdup(boundary));
 573         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("protocol"),
 574                             g_strdup("application/pkcs7-signature"));
 575         g_node_append(sigmultipart->node, msgcontent->node);
 576         g_node_append(mimeinfo->node, sigmultipart->node);
 577
 578         /* write message content to temporary file */
 579         fp = my_tmpfile();
 580         if (fp == NULL) {
 581                 perror("my_tmpfile");
 582                 return FALSE;
 583         }
 584         procmime_write_mimeinfo(sigmultipart, fp);
 585         rewind(fp);
 586
 587         /* read temporary file into memory */
 588         textstr = get_canonical_content(fp, boundary);
 589
 590         g_free(boundary);
 591
 592         fclose(fp);
 593
 594         gpgme_data_new_from_mem(&gpgtext, textstr, textstr?strlen(textstr):0, 0);
 595         gpgme_data_new(&gpgsig);
 596         gpgme_new(&ctx);
 597         gpgme_set_armor(ctx, TRUE);
 598         gpgme_signers_clear (ctx);
 599
 600         err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
 601
 602         if (err) {
 603                 debug_print ("gpgme_set_protocol failed: %s\n",
 604                    gpgme_strerror (err));
 605                 gpgme_data_release(gpgtext);
 606                 gpgme_release(ctx);
 607                 return FALSE;
 608         }
 609
 610         if (!sgpgme_setup_signers(ctx, account, from_addr)) {
 611                 debug_print("setup_signers failed\n");
 612                 gpgme_data_release(gpgtext);
 613                 gpgme_release(ctx);
 614                 return FALSE;
 615         }
 616
 617         info.c = ctx;
 618         prefs_gpg_enable_agent(TRUE);
 619         gpgme_set_passphrase_cb (ctx, NULL, &info);
 620
 621         err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_DETACH);
 622         if (err != GPG_ERR_NO_ERROR) {
 623                 alertpanel_error("S/MIME : Cannot sign, %s (%d)", gpg_strerror(err), gpg_err_code(err));
 624                 gpgme_data_release(gpgtext);
 625                 gpgme_release(ctx);
 626                 return FALSE;
 627         }
 628         result = gpgme_op_sign_result(ctx);
 629         if (result && result->signatures) {
 630             if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 631                 micalg = g_strdup_printf("PGP-%s", gpgme_hash_algo_name(
 632                             result->signatures->hash_algo));
 633             } else {
 634                 micalg = g_strdup(gpgme_hash_algo_name(
 635                             result->signatures->hash_algo));
 636             }
 637         } else {
 638             /* can't get result (maybe no signing key?) */
 639             debug_print("gpgme_op_sign_result error\n");
 640             return FALSE;
 641         }
 642
 643         gpgme_release(ctx);
 644         sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
 645         gpgme_data_release(gpgtext);
 646         g_free(textstr);
 647
 648         if (!sigcontent) {
 649                 gpgme_release(ctx);
 650                 return FALSE;
 651         }
 652         real_content = sigcontent+strlen("-----BEGIN SIGNED MESSAGE-----\n");
 653         if (!strstr(real_content, "-----END SIGNED MESSAGE-----")) {
 654                 debug_print("missing end\n");
 655                 gpgme_release(ctx);
 656                 return FALSE;
 657         }
 658         *strstr(real_content, "-----END SIGNED MESSAGE-----") = '\0';
 659         /* add signature */
 660         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
 661                             micalg);
 662
 663         newinfo = procmime_mimeinfo_new();
 664         newinfo->type = MIMETYPE_APPLICATION;
 665         newinfo->subtype = g_strdup("pkcs7-signature");
 666         g_hash_table_insert(newinfo->typeparameters, g_strdup("name"),
 667                              g_strdup("smime.p7s"));
 668         newinfo->content = MIMECONTENT_MEM;
 669         newinfo->disposition = DISPOSITIONTYPE_ATTACHMENT;
 670         g_hash_table_insert(newinfo->dispositionparameters, g_strdup("filename"),
 671                             g_strdup("smime.p7s"));
 672         newinfo->data.mem = g_malloc(len + 1);
 673         g_memmove(newinfo->data.mem, real_content, len);
 674         newinfo->data.mem[len] = '\0';
 675         newinfo->encoding_type = ENC_BASE64;
 676         g_node_append(sigmultipart->node, newinfo->node);
 677
 678         g_free(sigcontent);
 679
 680         return TRUE;
 681 }
 682 gchar *smime_get_encrypt_data(GSList *recp_names)
 683 {
 684         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_CMS);
 685 }
 686
 687 static const gchar *smime_get_encrypt_warning(void)
 688 {
 689         if (prefs_gpg_should_skip_encryption_warning(smime_system.id))
 690                 return NULL;
 691         else
 692                 return _("Please note that email headers, like Subject, "
 693                          "are not encrypted by the S/MIME system.");
 694 }
 695
 696 static void smime_inhibit_encrypt_warning(gboolean inhibit)
 697 {
 698         if (inhibit)
 699                 prefs_gpg_add_skip_encryption_warning(smime_system.id);
 700         else
 701                 prefs_gpg_remove_skip_encryption_warning(smime_system.id);
 702 }
 703
 704 static gchar *fp_read_noconv(FILE *fp)
 705 {
 706         GByteArray *array;
 707         guchar buf[BUFSIZ];
 708         gint n_read;
 709         gchar *result = NULL;
 710
 711         if (!fp)
 712                 return NULL;
 713         array = g_byte_array_new();
 714
 715         while ((n_read = fread(buf, sizeof(gchar), sizeof(buf), fp)) > 0) {
 716                 if (n_read < sizeof(buf) && ferror(fp))
 717                         break;
 718                 g_byte_array_append(array, buf, n_read);
 719         }
 720
 721         if (ferror(fp)) {
 722                 FILE_OP_ERROR("file stream", "fread");
 723                 g_byte_array_free(array, TRUE);
 724                 return NULL;
 725         }
 726
 727         buf[0] = '\0';
 728         g_byte_array_append(array, buf, 1);
 729         result = (gchar *)array->data;
 730         g_byte_array_free(array, FALSE);
 731
 732         return result;
 733 }
 734
 735 gboolean smime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
 736 {
 737         MimeInfo *msgcontent, *encmultipart;
 738         FILE *fp;
 739         gchar *enccontent;
 740         size_t len;
 741         gchar *textstr = NULL;
 742         gpgme_data_t gpgtext = NULL, gpgenc = NULL;
 743         gpgme_ctx_t ctx = NULL;
 744         gpgme_key_t *kset = NULL;
 745         gchar **fprs = g_strsplit(encrypt_data, " ", -1);
 746         gint i = 0;
 747         gpgme_error_t err;
 748         gchar *tmpfile = NULL;
 749
 750         while (fprs[i] && strlen(fprs[i])) {
 751                 i++;
 752         }
 753
 754         gpgme_new(&ctx);
 755
 756         err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
 757
 758         if (err) {
 759                 debug_print ("gpgme_set_protocol failed: %s\n",
 760                    gpgme_strerror (err));
 761                 return FALSE;
 762         }
 763
 764         kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
 765         memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
 766         i = 0;
 767
 768         while (fprs[i] && strlen(fprs[i])) {
 769                 gpgme_key_t key;
 770                 gpgme_error_t err;
 771                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
 772                 if (err) {
 773                         debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
 774                         break;
 775                 }
 776                 debug_print("found %s at %d\n", fprs[i], i);
 777                 kset[i] = key;
 778                 i++;
 779         }
 780
 781         debug_print("Encrypting message content\n");
 782
 783         /* remove content node from message */
 784         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 785         g_node_unlink(msgcontent->node);
 786
 787
 788         /* create temporary multipart for content */
 789         encmultipart = procmime_mimeinfo_new();
 790         encmultipart->type = MIMETYPE_APPLICATION;
 791         encmultipart->subtype = g_strdup("x-pkcs7-mime");
 792         g_hash_table_insert(encmultipart->typeparameters, g_strdup("name"),
 793                             g_strdup("smime.p7m"));
 794         g_hash_table_insert(encmultipart->typeparameters,
 795                             g_strdup("smime-type"),
 796                             g_strdup("enveloped-data"));
 797
 798         encmultipart->disposition = DISPOSITIONTYPE_ATTACHMENT;
 799         g_hash_table_insert(encmultipart->dispositionparameters, g_strdup("filename"),
 800                             g_strdup("smime.p7m"));
 801
 802         g_node_append(encmultipart->node, msgcontent->node);
 803
 804         /* write message content to temporary file */
 805         tmpfile = get_tmp_file();
 806         fp = g_fopen(tmpfile, "wb");
 807         if (fp == NULL) {
 808                 perror("get_tmp_file");
 809                 return FALSE;
 810         }
 811         procmime_decode_content(msgcontent);
 812         procmime_write_mime_header(msgcontent, fp);
 813         procmime_write_mimeinfo(msgcontent, fp);
 814         fclose(fp);
 815         canonicalize_file_replace(tmpfile);
 816         fp = g_fopen(tmpfile, "rb");
 817         if (fp == NULL) {
 818                 perror("get_tmp_file");
 819                 return FALSE;
 820         }
 821         g_free(tmpfile);
 822
 823         /* read temporary file into memory */
 824         textstr = fp_read_noconv(fp);
 825
 826         fclose(fp);
 827
 828         /* encrypt data */
 829         gpgme_data_new_from_mem(&gpgtext, textstr, textstr?strlen(textstr):0, 0);
 830         gpgme_data_new(&gpgenc);
 831         cm_gpgme_data_rewind(gpgtext);
 832
 833         gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
 834
 835         gpgme_release(ctx);
 836         enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
 837
 838         if (!enccontent) {
 839                 g_warning("no enccontent\n");
 840                 return FALSE;
 841         }
 842
 843         tmpfile = get_tmp_file();
 844         fp = g_fopen(tmpfile, "wb");
 845         if (fp) {
 846                 if (fwrite(enccontent, 1, len, fp) < len) {
 847                         FILE_OP_ERROR(tmpfile, "fwrite");
 848                         fclose(fp);
 849                         claws_unlink(tmpfile);
 850                         g_free(tmpfile);
 851                         return FALSE;
 852                 }
 853                 if (fclose(fp) == EOF) {
 854                         FILE_OP_ERROR(tmpfile, "fclose");
 855                         claws_unlink(tmpfile);
 856                         g_free(tmpfile);
 857                         return FALSE;
 858                 }
 859         } else {
 860                 perror("get_tmp_file");
 861                 g_free(tmpfile);
 862                 return FALSE;
 863         }
 864         gpgme_data_release(gpgtext);
 865         g_free(textstr);
 866
 867         /* create encrypted multipart */
 868         procmime_mimeinfo_free_all(msgcontent);
 869         g_node_append(mimeinfo->node, encmultipart->node);
 870
 871         encmultipart->content = MIMECONTENT_FILE;
 872         encmultipart->data.filename = tmpfile;
 873         procmime_encode_content(encmultipart, ENC_BASE64);
 874
 875         g_free(enccontent);
 876
 877         return TRUE;
 878 }
 879
 880 static PrivacySystem smime_system = {
 881         "smime",                        /* id */
 882         "S-MIME",                       /* name */
 883
 884         smime_free_privacydata, /* free_privacydata */
 885
 886         smime_is_signed,                /* is_signed(MimeInfo *) */
 887         smime_check_signature,  /* check_signature(MimeInfo *) */
 888         smime_get_sig_status,           /* get_sig_status(MimeInfo *) */
 889         smime_get_sig_info_short,       /* get_sig_info_short(MimeInfo *) */
 890         smime_get_sig_info_full,        /* get_sig_info_full(MimeInfo *) */
 891
 892         smime_is_encrypted,             /* is_encrypted(MimeInfo *) */
 893         smime_decrypt,                  /* decrypt(MimeInfo *) */
 894
 895         TRUE,
 896         smime_sign,
 897
 898         TRUE,
 899         smime_get_encrypt_data,
 900         smime_encrypt,
 901         smime_get_encrypt_warning,
 902         smime_inhibit_encrypt_warning,
 903 };
 904
 905 void smime_init()
 906 {
 907         privacy_register_system(&smime_system);
 908 }
 909
 910 void smime_done()
 911 {
 912         privacy_unregister_system(&smime_system);
 913 }
 914
 915 struct PluginFeature *plugin_provides(void)
 916 {
 917         static struct PluginFeature features[] =
 918                 { {PLUGIN_PRIVACY, N_("S/MIME")},
 919                   {PLUGIN_NOTHING, NULL}};
 920         return features;
 921 }
 922 #endif /* USE_GPGME */