src/plugins/smime/smime.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2016 Colin Leroy and the Claws Mail team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #  include "config.h"
  21 #include "claws-features.h"
  22 #endif
  23
  24 #ifdef USE_GPGME
  25
  26 #include "defs.h"
  27 #include <glib.h>
  28 #include <gpgme.h>
  29 #include <ctype.h>
  30 #include <glib/gi18n.h>
  31
  32 #include "utils.h"
  33 #include "privacy.h"
  34 #include "procmime.h"
  35
  36 #include "smime.h"
  37 #include <plugins/pgpcore/sgpgme.h>
  38 #include <plugins/pgpcore/prefs_gpg.h>
  39 #include <plugins/pgpcore/pgp_utils.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 #include "safe_fclose.h"
  47
  48 typedef struct _PrivacyDataPGP PrivacyDataPGP;
  49
  50 struct _PrivacyDataPGP
  51 {
  52         PrivacyData     data;
  53
  54         gboolean        done_sigtest;
  55         gboolean        is_signed;
  56         gpgme_verify_result_t   sigstatus;
  57         gpgme_ctx_t     ctx;
  58 };
  59
  60 static PrivacySystem smime_system;
  61
  62 static gint smime_check_signature(MimeInfo *mimeinfo);
  63
  64 static PrivacyDataPGP *smime_new_privacydata()
  65 {
  66         PrivacyDataPGP *data;
  67         gpgme_ctx_t     ctx;
  68
  69         if (gpgme_new(&ctx) != GPG_ERR_NO_ERROR) {
  70                 debug_print("gpgme_new failed\n");
  71                 return NULL;
  72         }
  73
  74         data = g_new0(PrivacyDataPGP, 1);
  75         data->data.system = &smime_system;
  76         data->done_sigtest = FALSE;
  77         data->is_signed = FALSE;
  78         data->sigstatus = NULL;
  79         data->ctx = ctx;
  80
  81         return data;
  82 }
  83
  84 static void smime_free_privacydata(PrivacyData *_data)
  85 {
  86         PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
  87         gpgme_release(data->ctx);
  88         g_free(data);
  89 }
  90
  91 static gboolean smime_is_signed(MimeInfo *mimeinfo)
  92 {
  93         MimeInfo *parent;
  94         MimeInfo *signature;
  95         const gchar *protocol, *tmpstr;
  96         PrivacyDataPGP *data = NULL;
  97
  98         cm_return_val_if_fail(mimeinfo != NULL, FALSE);
  99         if (mimeinfo->privacy != NULL) {
 100                 data = (PrivacyDataPGP *) mimeinfo->privacy;
 101                 if (data->done_sigtest)
 102                         return data->is_signed;
 103         }
 104
 105         if (!g_ascii_strcasecmp(mimeinfo->subtype, "pkcs7-mime") ||
 106             !g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
 107                 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
 108                 if (tmpstr && !g_ascii_strcasecmp(tmpstr, "signed-data")) {
 109                         if (data == NULL) {
 110                                 data = smime_new_privacydata();
 111                                 if (!data)
 112                                         return FALSE;
 113                                 mimeinfo->privacy = (PrivacyData *) data;
 114                         }
 115
 116                         data->done_sigtest = TRUE;
 117                         data->is_signed = TRUE;
 118                         smime_check_signature(mimeinfo);
 119                         return TRUE;
 120                 }
 121         }
 122
 123         /* check parent */
 124         parent = procmime_mimeinfo_parent(mimeinfo);
 125         if (parent == NULL)
 126                 return FALSE;
 127
 128         if ((parent->type != MIMETYPE_MULTIPART) ||
 129             g_ascii_strcasecmp(parent->subtype, "signed"))
 130                 return FALSE;
 131         protocol = procmime_mimeinfo_get_parameter(parent, "protocol");
 132         if ((protocol == NULL) ||
 133             (g_ascii_strcasecmp(protocol, "application/pkcs7-signature") &&
 134              g_ascii_strcasecmp(protocol, "application/x-pkcs7-signature")))
 135                 return FALSE;
 136
 137         /* check if mimeinfo is the first child */
 138         if (parent->node->children->data != mimeinfo)
 139                 return FALSE;
 140
 141
 142         /* check signature */
 143         signature = parent->node->children->next != NULL ?
 144             (MimeInfo *) parent->node->children->next->data : NULL;
 145         if (signature == NULL)
 146                 return FALSE;
 147         if ((signature->type != MIMETYPE_APPLICATION) ||
 148             (g_ascii_strcasecmp(signature->subtype, "pkcs7-signature") &&
 149              g_ascii_strcasecmp(signature->subtype, "x-pkcs7-signature")))
 150                 return FALSE;
 151
 152         if (data == NULL) {
 153                 data = smime_new_privacydata();
 154                 if (!data)
 155                         return FALSE;
 156                 mimeinfo->privacy = (PrivacyData *) data;
 157         }
 158
 159         data->done_sigtest = TRUE;
 160         data->is_signed = TRUE;
 161
 162         return TRUE;
 163 }
 164
 165 static gchar *get_canonical_content(FILE *fp, const gchar *boundary)
 166 {
 167         gchar *ret;
 168         GString *textbuffer;
 169         guint boundary_len = 0;
 170         gchar buf[BUFFSIZE];
 171
 172         if (boundary) {
 173                 boundary_len = strlen(boundary);
 174                 while (fgets(buf, sizeof(buf), fp) != NULL)
 175                         if (IS_BOUNDARY(buf, boundary, boundary_len))
 176                                 break;
 177         }
 178
 179         textbuffer = g_string_new("");
 180         while (fgets(buf, sizeof(buf), fp) != NULL) {
 181                 gchar *buf2;
 182
 183                 if (boundary && IS_BOUNDARY(buf, boundary, boundary_len))
 184                         break;
 185
 186                 buf2 = canonicalize_str(buf);
 187                 g_string_append(textbuffer, buf2);
 188                 g_free(buf2);
 189         }
 190         g_string_truncate(textbuffer, textbuffer->len - 2);
 191
 192         ret = textbuffer->str;
 193         g_string_free(textbuffer, FALSE);
 194
 195         return ret;
 196 }
 197
 198 static gint smime_check_signature(MimeInfo *mimeinfo)
 199 {
 200         PrivacyDataPGP *data;
 201         MimeInfo *parent, *signature;
 202         FILE *fp;
 203         gchar *boundary;
 204         gchar *textstr = NULL;
 205         const gchar *tmpstr;
 206         gpgme_data_t sigdata = NULL, textdata = NULL;
 207         gpgme_error_t err;
 208         EncodingType oldenc = ENC_BINARY;
 209
 210         cm_return_val_if_fail(mimeinfo != NULL, -1);
 211         cm_return_val_if_fail(mimeinfo->privacy != NULL, -1);
 212
 213         data = (PrivacyDataPGP *) mimeinfo->privacy;
 214
 215         if (!data->ctx) {
 216                 if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
 217                         debug_print("gpgme_new failed: %s\n",
 218                                 gpgme_strerror(err));
 219                         return -1;
 220                 }
 221         }
 222
 223         debug_print("Checking S/MIME signature\n");
 224
 225         err = gpgme_set_protocol(data->ctx, GPGME_PROTOCOL_CMS);
 226
 227         if (err) {
 228                 debug_print ("gpgme_set_protocol failed: %s\n",
 229                    gpgme_strerror (err));
 230         }
 231         parent = procmime_mimeinfo_parent(mimeinfo);
 232
 233         fp = g_fopen(parent->data.filename, "rb");
 234         cm_return_val_if_fail(fp != NULL, SIGNATURE_INVALID);
 235
 236         boundary = g_hash_table_lookup(parent->typeparameters, "boundary");
 237         if (!boundary) {
 238                 gchar *tmpfile = get_tmp_file();
 239                 debug_print("no boundary\n");
 240                 if (tmpfile) {
 241                         if (mimeinfo->encoding_type != ENC_BASE64) {
 242                                 procmime_encode_content(mimeinfo, ENC_BASE64);
 243                         }
 244                         oldenc = mimeinfo->encoding_type;
 245                         if (mimeinfo->encoding_type == ENC_BASE64)
 246                                 mimeinfo->encoding_type = ENC_BINARY;
 247                         if (procmime_get_part(tmpfile, mimeinfo) == 0) {
 248                                 textstr = file_read_to_str(tmpfile);
 249                         } else {
 250                                 textstr = NULL;
 251                         }
 252                         if (mimeinfo->encoding_type != oldenc)
 253                                 mimeinfo->encoding_type = oldenc;
 254                 }
 255                 g_free(tmpfile);
 256         } else {
 257                 textstr = get_canonical_content(fp, boundary);
 258         }
 259         err = gpgme_data_new_from_mem(&textdata, textstr, textstr?strlen(textstr):0, 0);
 260
 261         if (err) {
 262                 debug_print ("gpgme_data_new_from_mem failed: %s\n",
 263                    gpgme_strerror (err));
 264         }
 265
 266         if (!g_ascii_strcasecmp(mimeinfo->subtype, "pkcs7-mime") ||
 267             !g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
 268                 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
 269                 if (tmpstr && !g_ascii_strcasecmp(tmpstr, "signed-data")) {
 270                         gpgme_data_t cipher;
 271                         size_t len;
 272                         if (oldenc == ENC_BASE64)
 273                                 gpgme_data_set_encoding (textdata, GPGME_DATA_ENCODING_BASE64);
 274                         gpgme_data_new(&cipher);
 275                         data->sigstatus =
 276                                 sgpgme_verify_signature (data->ctx, textdata, NULL, cipher);
 277                         gpgme_data_release(textdata);
 278                         g_free(textstr);
 279                         cm_gpgme_data_rewind(cipher);
 280                         textstr = sgpgme_data_release_and_get_mem(cipher, &len);
 281                         fclose(fp);
 282                         if (textstr && len > 0)
 283                                 textstr[len-1]='\0';
 284
 285                         if (textstr && len) {
 286                                 gchar *tmp_file = get_tmp_file();
 287                                 MimeInfo *newinfo = NULL, *decinfo = NULL, *parentinfo = NULL;
 288
 289                                 str_write_to_file(textstr, tmp_file);
 290                                 newinfo = procmime_scan_file(tmp_file);
 291                                 decinfo = g_node_first_child(newinfo->node) != NULL ?
 292                                         g_node_first_child(newinfo->node)->data : NULL;
 293
 294                                 if (decinfo == NULL) {
 295                                         g_free(textstr);
 296                                         return -1;
 297                                 }
 298
 299                                 g_node_unlink(decinfo->node);
 300                                 procmime_mimeinfo_free_all(&newinfo);
 301                                 decinfo->tmp = TRUE;
 302                                 parentinfo = procmime_mimeinfo_parent(mimeinfo);
 303
 304                                 if (parentinfo->type == MIMETYPE_MESSAGE &&
 305                                     !strcmp(parentinfo->subtype, "rfc822")) {
 306                                         procmime_decode_content(parentinfo);
 307                                         procmime_encode_content(parentinfo, ENC_BASE64);
 308                                         procmime_encode_content(parentinfo, ENC_8BIT);
 309                                         if (parentinfo->content == MIMECONTENT_MEM) {
 310                                                 gint newlen =
 311                                                         (gint)(strstr(parentinfo->data.mem, "\n\n") - parentinfo->data.mem);
 312                                                 if (newlen > 0)
 313                                                         parentinfo->length = newlen;
 314                                         }
 315                                 }
 316                                 g_node_prepend(parentinfo->node, decinfo->node);
 317                                 g_free(textstr);
 318                                 return 0;
 319                         } else {
 320                                 if (textstr)
 321                                         g_free(textstr);
 322                                 return -1;
 323                         }
 324                 }
 325         }
 326
 327         signature = (MimeInfo *) mimeinfo->node->next->data;
 328         sigdata = sgpgme_data_from_mimeinfo(signature);
 329
 330         err = 0;
 331         if (signature->encoding_type == ENC_BASE64) {
 332                 err = gpgme_data_set_encoding (sigdata, GPGME_DATA_ENCODING_BASE64);
 333         }
 334
 335         if (err) {
 336                 debug_print ("gpgme_data_set_encoding failed: %s\n",
 337                         gpgme_strerror (err));
 338         }
 339
 340         data->sigstatus =
 341                 sgpgme_verify_signature (data->ctx, sigdata, textdata, NULL);
 342
 343         gpgme_data_release(sigdata);
 344         gpgme_data_release(textdata);
 345         g_free(textstr);
 346         fclose(fp);
 347
 348         return 0;
 349 }
 350
 351 static SignatureStatus smime_get_sig_status(MimeInfo *mimeinfo)
 352 {
 353         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 354
 355         cm_return_val_if_fail(data != NULL, SIGNATURE_INVALID);
 356
 357         return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
 358 }
 359
 360 static gchar *smime_get_sig_info_short(MimeInfo *mimeinfo)
 361 {
 362         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 363
 364         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 365
 366         return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
 367 }
 368
 369 static gchar *smime_get_sig_info_full(MimeInfo *mimeinfo)
 370 {
 371         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 372
 373         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 374
 375         return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
 376 }
 377
 378 static gboolean smime_is_encrypted(MimeInfo *mimeinfo)
 379 {
 380         const gchar *tmpstr;
 381
 382         if (mimeinfo->type != MIMETYPE_APPLICATION)
 383                 return FALSE;
 384         if (!g_ascii_strcasecmp(mimeinfo->subtype, "pkcs7-mime")) {
 385                 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
 386                 if (tmpstr && g_ascii_strcasecmp(tmpstr, "enveloped-data"))
 387                         return FALSE;
 388                 else
 389                         return TRUE;
 390
 391         } else if (!g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
 392                 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
 393                 if (tmpstr && g_ascii_strcasecmp(tmpstr, "enveloped-data"))
 394                         return FALSE;
 395                 else
 396                         return TRUE;
 397         }
 398         return FALSE;
 399 }
 400
 401 static MimeInfo *smime_decrypt(MimeInfo *mimeinfo)
 402 {
 403         MimeInfo *encinfo, *decinfo, *parseinfo;
 404         gpgme_data_t cipher = NULL, plain = NULL;
 405         static gint id = 0;
 406         FILE *dstfp;
 407         gchar *fname;
 408         gpgme_verify_result_t sigstat = NULL;
 409         PrivacyDataPGP *data = NULL;
 410         gpgme_ctx_t ctx;
 411         gpgme_error_t err;
 412         gchar *chars;
 413         size_t len;
 414
 415         cm_return_val_if_fail(smime_is_encrypted(mimeinfo), NULL);
 416
 417         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 418                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 419                 return NULL;
 420         }
 421
 422         err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
 423         if (err) {
 424                 debug_print ("gpgme_set_protocol failed: %s\n",
 425                    gpgme_strerror (err));
 426                 privacy_set_error(_("Couldn't set GPG protocol, %s"), gpgme_strerror(err));
 427                 gpgme_release(ctx);
 428                 return NULL;
 429         }
 430         gpgme_set_armor(ctx, TRUE);
 431
 432         encinfo = mimeinfo;
 433
 434         cipher = sgpgme_data_from_mimeinfo(encinfo);
 435
 436         plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
 437
 438         gpgme_data_release(cipher);
 439         if (plain == NULL) {
 440                 debug_print("plain is null!\n");
 441                 gpgme_release(ctx);
 442                 return NULL;
 443         }
 444
 445         fname = g_strdup_printf("%s%cplaintext.%08x",
 446                 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
 447
 448         if ((dstfp = g_fopen(fname, "wb")) == NULL) {
 449                 FILE_OP_ERROR(fname, "g_fopen");
 450                 g_free(fname);
 451                 gpgme_data_release(plain);
 452                 gpgme_release(ctx);
 453                 debug_print("can't open!\n");
 454                 privacy_set_error(_("Couldn't open temporary file"));
 455                 return NULL;
 456         }
 457
 458         if (fprintf(dstfp, "MIME-Version: 1.0\n") < 0) {
 459                 FILE_OP_ERROR(fname, "fprintf");
 460                 g_free(fname);
 461                 fclose(dstfp);
 462                 gpgme_data_release(plain);
 463                 gpgme_release(ctx);
 464                 debug_print("can't close!\n");
 465                 privacy_set_error(_("Couldn't write to temporary file"));
 466                 return NULL;
 467         }
 468
 469         chars = sgpgme_data_release_and_get_mem(plain, &len);
 470
 471         if (len > 0) {
 472                 if (fwrite(chars, 1, len, dstfp) < len) {
 473                         FILE_OP_ERROR(fname, "fwrite");
 474                         fclose(dstfp);
 475                         g_free(fname);
 476                         g_free(chars);
 477                         gpgme_data_release(plain);
 478                         gpgme_release(ctx);
 479                         debug_print("can't write!\n");
 480                         privacy_set_error(_("Couldn't write to temporary file"));
 481                         return NULL;
 482                 }
 483         }
 484         if (safe_fclose(dstfp) == EOF) {
 485                 FILE_OP_ERROR(fname, "fclose");
 486                 g_free(fname);
 487                 g_free(chars);
 488                 gpgme_data_release(plain);
 489                 gpgme_release(ctx);
 490                 debug_print("can't close!\n");
 491                 privacy_set_error(_("Couldn't close temporary file"));
 492                 return NULL;
 493         }
 494         g_free(chars);
 495
 496         parseinfo = procmime_scan_file(fname);
 497         g_free(fname);
 498         if (parseinfo == NULL) {
 499                 privacy_set_error(_("Couldn't parse decrypted file."));
 500                 gpgme_release(ctx);
 501                 return NULL;
 502         }
 503         decinfo = g_node_first_child(parseinfo->node) != NULL ?
 504                 g_node_first_child(parseinfo->node)->data : NULL;
 505         if (decinfo == NULL) {
 506                 privacy_set_error(_("Couldn't parse decrypted file parts."));
 507                 gpgme_release(ctx);
 508                 return NULL;
 509         }
 510
 511         g_node_unlink(decinfo->node);
 512         procmime_mimeinfo_free_all(&parseinfo);
 513
 514         decinfo->tmp = TRUE;
 515
 516         if (sigstat != NULL && sigstat->signatures != NULL) {
 517                 if (decinfo->privacy != NULL) {
 518                         data = (PrivacyDataPGP *) decinfo->privacy;
 519                 } else {
 520                         data = smime_new_privacydata();
 521                         if (!data) {
 522                                 gpgme_release(ctx);
 523                                 return NULL;
 524                         }
 525                         decinfo->privacy = (PrivacyData *) data;
 526                 }
 527                 data->done_sigtest = TRUE;
 528                 data->is_signed = TRUE;
 529                 data->sigstatus = sigstat;
 530                 if (data->ctx)
 531                         gpgme_release(data->ctx);
 532                 data->ctx = ctx;
 533         } else
 534                 gpgme_release(ctx);
 535
 536
 537
 538         return decinfo;
 539 }
 540
 541 gboolean smime_sign(MimeInfo *mimeinfo, PrefsAccount *account, const gchar *from_addr)
 542 {
 543         MimeInfo *msgcontent, *sigmultipart, *newinfo;
 544         gchar *textstr, *micalg = NULL;
 545         FILE *fp;
 546         gchar *boundary = NULL;
 547         gchar *sigcontent;
 548         gpgme_ctx_t ctx;
 549         gpgme_data_t gpgtext, gpgsig;
 550         gpgme_error_t err;
 551         size_t len;
 552         struct passphrase_cb_info_s info;
 553         gpgme_sign_result_t result = NULL;
 554         gchar *test_msg;
 555         gchar *real_content = NULL;
 556
 557         fp = my_tmpfile();
 558         if (fp == NULL) {
 559                 perror("my_tmpfile");
 560                 return FALSE;
 561         }
 562         procmime_write_mimeinfo(mimeinfo, fp);
 563         rewind(fp);
 564
 565         /* read temporary file into memory */
 566         test_msg = file_read_stream_to_str(fp);
 567         fclose(fp);
 568
 569         memset (&info, 0, sizeof info);
 570
 571         /* remove content node from message */
 572         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 573         g_node_unlink(msgcontent->node);
 574
 575         /* create temporary multipart for content */
 576         sigmultipart = procmime_mimeinfo_new();
 577         sigmultipart->type = MIMETYPE_MULTIPART;
 578         sigmultipart->subtype = g_strdup("signed");
 579
 580         do {
 581                 if (boundary)
 582                         g_free(boundary);
 583                 boundary = generate_mime_boundary("Sig");
 584         } while (strstr(test_msg, boundary) != NULL);
 585
 586         g_free(test_msg);
 587
 588         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
 589                             g_strdup(boundary));
 590         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("protocol"),
 591                             g_strdup("application/pkcs7-signature"));
 592         g_node_append(sigmultipart->node, msgcontent->node);
 593         g_node_append(mimeinfo->node, sigmultipart->node);
 594
 595         /* write message content to temporary file */
 596         fp = my_tmpfile();
 597         if (fp == NULL) {
 598                 perror("my_tmpfile");
 599                 return FALSE;
 600         }
 601         procmime_write_mimeinfo(sigmultipart, fp);
 602         rewind(fp);
 603
 604         /* read temporary file into memory */
 605         textstr = get_canonical_content(fp, boundary);
 606
 607         g_free(boundary);
 608
 609         fclose(fp);
 610
 611         gpgme_data_new_from_mem(&gpgtext, textstr, textstr?strlen(textstr):0, 0);
 612         gpgme_data_new(&gpgsig);
 613         gpgme_new(&ctx);
 614         gpgme_set_armor(ctx, TRUE);
 615         gpgme_signers_clear (ctx);
 616
 617         err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
 618
 619         if (err) {
 620                 debug_print ("gpgme_set_protocol failed: %s\n",
 621                    gpgme_strerror (err));
 622                 gpgme_data_release(gpgtext);
 623                 gpgme_release(ctx);
 624                 return FALSE;
 625         }
 626
 627         if (!sgpgme_setup_signers(ctx, account, from_addr)) {
 628                 debug_print("setup_signers failed\n");
 629                 gpgme_data_release(gpgtext);
 630                 gpgme_release(ctx);
 631                 return FALSE;
 632         }
 633
 634         info.c = ctx;
 635         prefs_gpg_enable_agent(TRUE);
 636         gpgme_set_passphrase_cb (ctx, NULL, &info);
 637
 638         err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_DETACH);
 639         if (err != GPG_ERR_NO_ERROR) {
 640                 alertpanel_error("S/MIME : Cannot sign, %s (%d)", gpg_strerror(err), gpg_err_code(err));
 641                 gpgme_data_release(gpgtext);
 642                 gpgme_release(ctx);
 643                 return FALSE;
 644         }
 645         result = gpgme_op_sign_result(ctx);
 646         if (result && result->signatures) {
 647             if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 648                 gchar *down_algo = g_ascii_strdown(gpgme_hash_algo_name(
 649                             result->signatures->hash_algo), -1);
 650                 micalg = g_strdup_printf("pgp-%s", down_algo);
 651                 g_free(down_algo);
 652             } else {
 653                 micalg = g_strdup(gpgme_hash_algo_name(
 654                             result->signatures->hash_algo));
 655             }
 656         } else {
 657             /* can't get result (maybe no signing key?) */
 658             debug_print("gpgme_op_sign_result error\n");
 659             return FALSE;
 660         }
 661
 662         gpgme_release(ctx);
 663         sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
 664         gpgme_data_release(gpgtext);
 665         g_free(textstr);
 666
 667         if (!sigcontent) {
 668                 gpgme_release(ctx);
 669                 g_free(micalg);
 670                 return FALSE;
 671         }
 672         real_content = sigcontent+strlen("-----BEGIN SIGNED MESSAGE-----\n");
 673         if (!strstr(real_content, "-----END SIGNED MESSAGE-----")) {
 674                 debug_print("missing end\n");
 675                 gpgme_release(ctx);
 676                 g_free(micalg);
 677                 return FALSE;
 678         }
 679         *strstr(real_content, "-----END SIGNED MESSAGE-----") = '\0';
 680         /* add signature */
 681         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
 682                             micalg);
 683
 684         newinfo = procmime_mimeinfo_new();
 685         newinfo->type = MIMETYPE_APPLICATION;
 686         newinfo->subtype = g_strdup("pkcs7-signature");
 687         g_hash_table_insert(newinfo->typeparameters, g_strdup("name"),
 688                              g_strdup("smime.p7s"));
 689         newinfo->content = MIMECONTENT_MEM;
 690         newinfo->disposition = DISPOSITIONTYPE_ATTACHMENT;
 691         g_hash_table_insert(newinfo->dispositionparameters, g_strdup("filename"),
 692                             g_strdup("smime.p7s"));
 693         newinfo->data.mem = g_malloc(len + 1);
 694         g_memmove(newinfo->data.mem, real_content, len);
 695         newinfo->data.mem[len] = '\0';
 696         newinfo->encoding_type = ENC_BASE64;
 697         g_node_append(sigmultipart->node, newinfo->node);
 698
 699         g_free(sigcontent);
 700
 701         return TRUE;
 702 }
 703 gchar *smime_get_encrypt_data(GSList *recp_names)
 704 {
 705         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_CMS);
 706 }
 707
 708 static const gchar *smime_get_encrypt_warning(void)
 709 {
 710         if (prefs_gpg_should_skip_encryption_warning(smime_system.id))
 711                 return NULL;
 712         else
 713                 return _("Please note that email headers, like Subject, "
 714                          "are not encrypted by the S/MIME system.");
 715 }
 716
 717 static void smime_inhibit_encrypt_warning(gboolean inhibit)
 718 {
 719         if (inhibit)
 720                 prefs_gpg_add_skip_encryption_warning(smime_system.id);
 721         else
 722                 prefs_gpg_remove_skip_encryption_warning(smime_system.id);
 723 }
 724
 725 gboolean smime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
 726 {
 727         MimeInfo *msgcontent, *encmultipart;
 728         FILE *fp;
 729         gchar *enccontent;
 730         size_t len;
 731         gchar *textstr = NULL;
 732         gpgme_data_t gpgtext = NULL, gpgenc = NULL;
 733         gpgme_ctx_t ctx = NULL;
 734         gpgme_key_t *kset = NULL;
 735         gchar **fprs = g_strsplit(encrypt_data, " ", -1);
 736         gint i = 0;
 737         gpgme_error_t err;
 738         gchar *tmpfile = NULL;
 739
 740         while (fprs[i] && strlen(fprs[i])) {
 741                 i++;
 742         }
 743
 744         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 745                 debug_print ("gpgme_new failed: %s\n", gpgme_strerror(err));
 746                 return FALSE;
 747         }
 748
 749         err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
 750
 751         if (err) {
 752                 debug_print ("gpgme_set_protocol failed: %s\n",
 753                    gpgme_strerror (err));
 754                 return FALSE;
 755         }
 756
 757         kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
 758         memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
 759         i = 0;
 760
 761         while (fprs[i] && strlen(fprs[i])) {
 762                 gpgme_key_t key;
 763                 gpgme_error_t err;
 764                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
 765                 if (err) {
 766                         debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
 767                         break;
 768                 }
 769                 debug_print("found %s at %d\n", fprs[i], i);
 770                 kset[i] = key;
 771                 i++;
 772         }
 773
 774         debug_print("Encrypting message content\n");
 775
 776         /* remove content node from message */
 777         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 778         g_node_unlink(msgcontent->node);
 779
 780
 781         /* create temporary multipart for content */
 782         encmultipart = procmime_mimeinfo_new();
 783         encmultipart->type = MIMETYPE_APPLICATION;
 784         encmultipart->subtype = g_strdup("x-pkcs7-mime");
 785         g_hash_table_insert(encmultipart->typeparameters, g_strdup("name"),
 786                             g_strdup("smime.p7m"));
 787         g_hash_table_insert(encmultipart->typeparameters,
 788                             g_strdup("smime-type"),
 789                             g_strdup("enveloped-data"));
 790
 791         encmultipart->disposition = DISPOSITIONTYPE_ATTACHMENT;
 792         g_hash_table_insert(encmultipart->dispositionparameters, g_strdup("filename"),
 793                             g_strdup("smime.p7m"));
 794
 795         g_node_append(encmultipart->node, msgcontent->node);
 796
 797         /* write message content to temporary file */
 798         tmpfile = get_tmp_file();
 799         fp = g_fopen(tmpfile, "wb");
 800         if (fp == NULL) {
 801                 FILE_OP_ERROR(tmpfile, "create");
 802                 g_free(kset);
 803                 return FALSE;
 804         }
 805         procmime_decode_content(msgcontent);
 806         procmime_write_mime_header(msgcontent, fp);
 807         procmime_write_mimeinfo(msgcontent, fp);
 808         safe_fclose(fp);
 809         canonicalize_file_replace(tmpfile);
 810         fp = g_fopen(tmpfile, "rb");
 811         if (fp == NULL) {
 812                 FILE_OP_ERROR(tmpfile, "open");
 813                 g_free(kset);
 814                 return FALSE;
 815         }
 816         g_free(tmpfile);
 817
 818         /* read temporary file into memory */
 819         textstr = fp_read_noconv(fp);
 820
 821         fclose(fp);
 822
 823         /* encrypt data */
 824         gpgme_data_new_from_mem(&gpgtext, textstr, textstr?strlen(textstr):0, 0);
 825         gpgme_data_new(&gpgenc);
 826         cm_gpgme_data_rewind(gpgtext);
 827
 828         gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
 829
 830         gpgme_release(ctx);
 831         g_free(kset);
 832         enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
 833
 834         if (!enccontent) {
 835                 g_warning("no enccontent");
 836                 return FALSE;
 837         }
 838
 839         tmpfile = get_tmp_file();
 840         fp = g_fopen(tmpfile, "wb");
 841         if (fp) {
 842                 if (fwrite(enccontent, 1, len, fp) < len) {
 843                         FILE_OP_ERROR(tmpfile, "fwrite");
 844                         fclose(fp);
 845                         claws_unlink(tmpfile);
 846                         g_free(tmpfile);
 847                         g_free(enccontent);
 848                         return FALSE;
 849                 }
 850                 if (safe_fclose(fp) == EOF) {
 851                         FILE_OP_ERROR(tmpfile, "fclose");
 852                         claws_unlink(tmpfile);
 853                         g_free(tmpfile);
 854                         g_free(enccontent);
 855                         return FALSE;
 856                 }
 857         } else {
 858                 FILE_OP_ERROR(tmpfile, "create");
 859                 g_free(tmpfile);
 860                 g_free(enccontent);
 861                 return FALSE;
 862         }
 863         gpgme_data_release(gpgtext);
 864         g_free(textstr);
 865
 866         /* create encrypted multipart */
 867         procmime_mimeinfo_free_all(&msgcontent);
 868         g_node_append(mimeinfo->node, encmultipart->node);
 869
 870         encmultipart->content = MIMECONTENT_FILE;
 871         encmultipart->data.filename = tmpfile;
 872         procmime_encode_content(encmultipart, ENC_BASE64);
 873
 874         g_free(enccontent);
 875
 876         return TRUE;
 877 }
 878
 879 static PrivacySystem smime_system = {
 880         "smime",                        /* id */
 881         "S-MIME",                       /* name */
 882
 883         smime_free_privacydata, /* free_privacydata */
 884
 885         smime_is_signed,                /* is_signed(MimeInfo *) */
 886         smime_check_signature,  /* check_signature(MimeInfo *) */
 887         smime_get_sig_status,           /* get_sig_status(MimeInfo *) */
 888         smime_get_sig_info_short,       /* get_sig_info_short(MimeInfo *) */
 889         smime_get_sig_info_full,        /* get_sig_info_full(MimeInfo *) */
 890
 891         smime_is_encrypted,             /* is_encrypted(MimeInfo *) */
 892         smime_decrypt,                  /* decrypt(MimeInfo *) */
 893
 894         TRUE,
 895         smime_sign,
 896
 897         TRUE,
 898         smime_get_encrypt_data,
 899         smime_encrypt,
 900         smime_get_encrypt_warning,
 901         smime_inhibit_encrypt_warning,
 902         prefs_gpg_auto_check_signatures,
 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 */