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