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
  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         gpgme_ctx_t     ctx;
  67
  68         if (gpgme_new(&ctx) != GPG_ERR_NO_ERROR) {
  69                 debug_print("gpgme_new failed\n");
  70                 return NULL;
  71         }
  72
  73         data = g_new0(PrivacyDataPGP, 1);
  74         data->data.system = &smime_system;
  75         data->done_sigtest = FALSE;
  76         data->is_signed = FALSE;
  77         data->sigstatus = NULL;
  78         data->ctx = ctx;
  79
  80         return data;
  81 }
  82
  83 static void smime_free_privacydata(PrivacyData *_data)
  84 {
  85         PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
  86         gpgme_release(data->ctx);
  87         g_free(data);
  88 }
  89
  90 static gboolean smime_is_signed(MimeInfo *mimeinfo)
  91 {
  92         MimeInfo *parent;
  93         MimeInfo *signature;
  94         const gchar *protocol, *tmpstr;
  95         PrivacyDataPGP *data = NULL;
  96
  97         cm_return_val_if_fail(mimeinfo != NULL, FALSE);
  98         if (mimeinfo->privacy != NULL) {
  99                 data = (PrivacyDataPGP *) mimeinfo->privacy;
 100                 if (data->done_sigtest)
 101                         return data->is_signed;
 102         }
 103
 104         if (!g_ascii_strcasecmp(mimeinfo->subtype, "pkcs7-mime") ||
 105             !g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
 106                 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
 107                 if (tmpstr && !g_ascii_strcasecmp(tmpstr, "signed-data")) {
 108                         if (data == NULL) {
 109                                 data = smime_new_privacydata();
 110                                 if (!data)
 111                                         return FALSE;
 112                                 mimeinfo->privacy = (PrivacyData *) data;
 113                         }
 114
 115                         data->done_sigtest = TRUE;
 116                         data->is_signed = TRUE;
 117                         smime_check_signature(mimeinfo);
 118                         return TRUE;
 119                 }
 120         }
 121
 122         /* check parent */
 123         parent = procmime_mimeinfo_parent(mimeinfo);
 124         if (parent == NULL)
 125                 return FALSE;
 126
 127         if ((parent->type != MIMETYPE_MULTIPART) ||
 128             g_ascii_strcasecmp(parent->subtype, "signed"))
 129                 return FALSE;
 130         protocol = procmime_mimeinfo_get_parameter(parent, "protocol");
 131         if ((protocol == NULL) ||
 132             (g_ascii_strcasecmp(protocol, "application/pkcs7-signature") &&
 133              g_ascii_strcasecmp(protocol, "application/x-pkcs7-signature")))
 134                 return FALSE;
 135
 136         /* check if mimeinfo is the first child */
 137         if (parent->node->children->data != mimeinfo)
 138                 return FALSE;
 139
 140
 141         /* check signature */
 142         signature = parent->node->children->next != NULL ?
 143             (MimeInfo *) parent->node->children->next->data : NULL;
 144         if (signature == NULL)
 145                 return FALSE;
 146         if ((signature->type != MIMETYPE_APPLICATION) ||
 147             (g_ascii_strcasecmp(signature->subtype, "pkcs7-signature") &&
 148              g_ascii_strcasecmp(signature->subtype, "x-pkcs7-signature")))
 149                 return FALSE;
 150
 151         if (data == NULL) {
 152                 data = smime_new_privacydata();
 153                 if (!data)
 154                         return FALSE;
 155                 mimeinfo->privacy = (PrivacyData *) data;
 156         }
 157
 158         data->done_sigtest = TRUE;
 159         data->is_signed = TRUE;
 160
 161         return TRUE;
 162 }
 163
 164 static gchar *get_canonical_content(FILE *fp, const gchar *boundary)
 165 {
 166         gchar *ret;
 167         GString *textbuffer;
 168         guint boundary_len = 0;
 169         gchar buf[BUFFSIZE];
 170
 171         if (boundary) {
 172                 boundary_len = strlen(boundary);
 173                 while (fgets(buf, sizeof(buf), fp) != NULL)
 174                         if (IS_BOUNDARY(buf, boundary, boundary_len))
 175                                 break;
 176         }
 177
 178         textbuffer = g_string_new("");
 179         while (fgets(buf, sizeof(buf), fp) != NULL) {
 180                 gchar *buf2;
 181
 182                 if (boundary && IS_BOUNDARY(buf, boundary, boundary_len))
 183                         break;
 184
 185                 buf2 = canonicalize_str(buf);
 186                 g_string_append(textbuffer, buf2);
 187                 g_free(buf2);
 188         }
 189         g_string_truncate(textbuffer, textbuffer->len - 2);
 190
 191         ret = textbuffer->str;
 192         g_string_free(textbuffer, FALSE);
 193
 194         return ret;
 195 }
 196
 197 static gint smime_check_signature(MimeInfo *mimeinfo)
 198 {
 199         PrivacyDataPGP *data;
 200         MimeInfo *parent, *signature;
 201         FILE *fp;
 202         gchar *boundary;
 203         gchar *textstr = NULL;
 204         const gchar *tmpstr;
 205         gpgme_data_t sigdata = NULL, textdata = NULL;
 206         gpgme_error_t err;
 207         EncodingType oldenc = ENC_BINARY;
 208
 209         cm_return_val_if_fail(mimeinfo != NULL, -1);
 210         cm_return_val_if_fail(mimeinfo->privacy != NULL, -1);
 211
 212         data = (PrivacyDataPGP *) mimeinfo->privacy;
 213
 214         if (!data->ctx) {
 215                 if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
 216                         debug_print("gpgme_new failed: %s\n",
 217                                 gpgme_strerror(err));
 218                         return -1;
 219                 }
 220         }
 221
 222         debug_print("Checking S/MIME signature\n");
 223
 224         err = gpgme_set_protocol(data->ctx, GPGME_PROTOCOL_CMS);
 225
 226         if (err) {
 227                 debug_print ("gpgme_set_protocol failed: %s\n",
 228                    gpgme_strerror (err));
 229         }
 230         parent = procmime_mimeinfo_parent(mimeinfo);
 231
 232         fp = g_fopen(parent->data.filename, "rb");
 233         cm_return_val_if_fail(fp != NULL, SIGNATURE_INVALID);
 234
 235         boundary = g_hash_table_lookup(parent->typeparameters, "boundary");
 236         if (!boundary) {
 237                 gchar *tmpfile = get_tmp_file();
 238                 debug_print("no boundary\n");
 239                 if (tmpfile) {
 240                         if (mimeinfo->encoding_type != ENC_BASE64) {
 241                                 procmime_encode_content(mimeinfo, ENC_BASE64);
 242                         }
 243                         oldenc = mimeinfo->encoding_type;
 244                         if (mimeinfo->encoding_type == ENC_BASE64)
 245                                 mimeinfo->encoding_type = ENC_BINARY;
 246                         if (procmime_get_part(tmpfile, mimeinfo) == 0) {
 247                                 textstr = file_read_to_str(tmpfile);
 248                         } else {
 249                                 textstr = NULL;
 250                         }
 251                         if (mimeinfo->encoding_type != oldenc)
 252                                 mimeinfo->encoding_type = oldenc;
 253                 }
 254                 g_free(tmpfile);
 255         } else {
 256                 textstr = get_canonical_content(fp, boundary);
 257         }
 258         err = gpgme_data_new_from_mem(&textdata, textstr, textstr?strlen(textstr):0, 0);
 259
 260         if (err) {
 261                 debug_print ("gpgme_data_new_from_mem failed: %s\n",
 262                    gpgme_strerror (err));
 263         }
 264
 265         if (!g_ascii_strcasecmp(mimeinfo->subtype, "pkcs7-mime") ||
 266             !g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
 267                 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
 268                 if (tmpstr && !g_ascii_strcasecmp(tmpstr, "signed-data")) {
 269                         gpgme_data_t cipher;
 270                         size_t len;
 271                         if (oldenc == ENC_BASE64)
 272                                 gpgme_data_set_encoding (textdata, GPGME_DATA_ENCODING_BASE64);
 273                         gpgme_data_new(&cipher);
 274                         data->sigstatus =
 275                                 sgpgme_verify_signature (data->ctx, textdata, NULL, cipher);
 276                         gpgme_data_release(textdata);
 277                         g_free(textstr);
 278                         cm_gpgme_data_rewind(cipher);
 279                         textstr = sgpgme_data_release_and_get_mem(cipher, &len);
 280                         fclose(fp);
 281                         if (textstr && len > 0)
 282                                 textstr[len-1]='\0';
 283
 284                         if (textstr && len) {
 285                                 gchar *tmp_file = get_tmp_file();
 286                                 MimeInfo *newinfo = NULL, *decinfo = NULL, *parentinfo = NULL;
 287
 288                                 str_write_to_file(textstr, tmp_file);
 289                                 newinfo = procmime_scan_file(tmp_file);
 290                                 decinfo = g_node_first_child(newinfo->node) != NULL ?
 291                                         g_node_first_child(newinfo->node)->data : NULL;
 292
 293                                 if (decinfo == NULL)
 294                                         return -1;
 295
 296                                 g_node_unlink(decinfo->node);
 297                                 procmime_mimeinfo_free_all(&newinfo);
 298                                 decinfo->tmp = TRUE;
 299                                 parentinfo = procmime_mimeinfo_parent(mimeinfo);
 300
 301                                 if (parentinfo->type == MIMETYPE_MESSAGE &&
 302                                     !strcmp(parentinfo->subtype, "rfc822")) {
 303                                         procmime_decode_content(parentinfo);
 304                                         procmime_encode_content(parentinfo, ENC_BASE64);
 305                                         procmime_encode_content(parentinfo, ENC_8BIT);
 306                                         if (parentinfo->content == MIMECONTENT_MEM) {
 307                                                 gint newlen =
 308                                                         (gint)(strstr(parentinfo->data.mem, "\n\n") - parentinfo->data.mem);
 309                                                 if (newlen > 0)
 310                                                         parentinfo->length = newlen;
 311                                         }
 312                                 }
 313                                 g_node_prepend(parentinfo->node, decinfo->node);
 314                                 return 0;
 315                         } else {
 316                                 g_free(textstr);
 317                                 return -1;
 318                         }
 319                 }
 320         }
 321
 322         signature = (MimeInfo *) mimeinfo->node->next->data;
 323         sigdata = sgpgme_data_from_mimeinfo(signature);
 324
 325         err = 0;
 326         if (signature->encoding_type == ENC_BASE64) {
 327                 err = gpgme_data_set_encoding (sigdata, GPGME_DATA_ENCODING_BASE64);
 328         }
 329
 330         if (err) {
 331                 debug_print ("gpgme_data_set_encoding failed: %s\n",
 332                         gpgme_strerror (err));
 333         }
 334
 335         data->sigstatus =
 336                 sgpgme_verify_signature (data->ctx, sigdata, textdata, NULL);
 337
 338         gpgme_data_release(sigdata);
 339         gpgme_data_release(textdata);
 340         g_free(textstr);
 341         fclose(fp);
 342
 343         return 0;
 344 }
 345
 346 static SignatureStatus smime_get_sig_status(MimeInfo *mimeinfo)
 347 {
 348         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 349
 350         cm_return_val_if_fail(data != NULL, SIGNATURE_INVALID);
 351
 352         return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
 353 }
 354
 355 static gchar *smime_get_sig_info_short(MimeInfo *mimeinfo)
 356 {
 357         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 358
 359         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 360
 361         return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
 362 }
 363
 364 static gchar *smime_get_sig_info_full(MimeInfo *mimeinfo)
 365 {
 366         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 367
 368         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 369
 370         return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
 371 }
 372
 373 static gboolean smime_is_encrypted(MimeInfo *mimeinfo)
 374 {
 375         const gchar *tmpstr;
 376
 377         if (mimeinfo->type != MIMETYPE_APPLICATION)
 378                 return FALSE;
 379         if (!g_ascii_strcasecmp(mimeinfo->subtype, "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         } else if (!g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
 387                 tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
 388                 if (tmpstr && g_ascii_strcasecmp(tmpstr, "enveloped-data"))
 389                         return FALSE;
 390                 else
 391                         return TRUE;
 392         }
 393         return FALSE;
 394 }
 395
 396 static MimeInfo *smime_decrypt(MimeInfo *mimeinfo)
 397 {
 398         MimeInfo *encinfo, *decinfo, *parseinfo;
 399         gpgme_data_t cipher = NULL, plain = NULL;
 400         static gint id = 0;
 401         FILE *dstfp;
 402         gchar *fname;
 403         gpgme_verify_result_t sigstat = NULL;
 404         PrivacyDataPGP *data = NULL;
 405         gpgme_ctx_t ctx;
 406         gpgme_error_t err;
 407         gchar *chars;
 408         size_t len;
 409
 410         cm_return_val_if_fail(smime_is_encrypted(mimeinfo), NULL);
 411
 412         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 413                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 414                 return NULL;
 415         }
 416
 417         err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
 418         if (err) {
 419                 debug_print ("gpgme_set_protocol failed: %s\n",
 420                    gpgme_strerror (err));
 421                 privacy_set_error(_("Couldn't set GPG protocol, %s"), gpgme_strerror(err));
 422                 gpgme_release(ctx);
 423                 return NULL;
 424         }
 425         gpgme_set_armor(ctx, TRUE);
 426
 427         encinfo = mimeinfo;
 428
 429         cipher = sgpgme_data_from_mimeinfo(encinfo);
 430
 431         plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
 432
 433         gpgme_data_release(cipher);
 434         if (plain == NULL) {
 435                 debug_print("plain is null!\n");
 436                 gpgme_release(ctx);
 437                 return NULL;
 438         }
 439
 440         fname = g_strdup_printf("%s%cplaintext.%08x",
 441                 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
 442
 443         if ((dstfp = g_fopen(fname, "wb")) == NULL) {
 444                 FILE_OP_ERROR(fname, "g_fopen");
 445                 g_free(fname);
 446                 gpgme_data_release(plain);
 447                 gpgme_release(ctx);
 448                 debug_print("can't open!\n");
 449                 privacy_set_error(_("Couldn't open temporary file"));
 450                 return NULL;
 451         }
 452
 453         if (fprintf(dstfp, "MIME-Version: 1.0\n") < 0) {
 454                 FILE_OP_ERROR(fname, "fprintf");
 455                 g_free(fname);
 456                 fclose(dstfp);
 457                 gpgme_data_release(plain);
 458                 gpgme_release(ctx);
 459                 debug_print("can't close!\n");
 460                 privacy_set_error(_("Couldn't write to temporary file"));
 461                 return NULL;
 462         }
 463
 464         chars = sgpgme_data_release_and_get_mem(plain, &len);
 465
 466         if (len > 0) {
 467                 if (fwrite(chars, 1, len, dstfp) < len) {
 468                         FILE_OP_ERROR(fname, "fwrite");
 469                         fclose(dstfp);
 470                         g_free(fname);
 471                         g_free(chars);
 472                         gpgme_data_release(plain);
 473                         gpgme_release(ctx);
 474                         debug_print("can't write!\n");
 475                         privacy_set_error(_("Couldn't write to temporary file"));
 476                         return NULL;
 477                 }
 478         }
 479         if (fclose(dstfp) == EOF) {
 480                 FILE_OP_ERROR(fname, "fclose");
 481                 g_free(fname);
 482                 g_free(chars);
 483                 gpgme_data_release(plain);
 484                 gpgme_release(ctx);
 485                 debug_print("can't close!\n");
 486                 privacy_set_error(_("Couldn't close temporary file"));
 487                 return NULL;
 488         }
 489         g_free(chars);
 490
 491         parseinfo = procmime_scan_file(fname);
 492         g_free(fname);
 493         if (parseinfo == NULL) {
 494                 privacy_set_error(_("Couldn't parse decrypted file."));
 495                 gpgme_release(ctx);
 496                 return NULL;
 497         }
 498         decinfo = g_node_first_child(parseinfo->node) != NULL ?
 499                 g_node_first_child(parseinfo->node)->data : NULL;
 500         if (decinfo == NULL) {
 501                 privacy_set_error(_("Couldn't parse decrypted file parts."));
 502                 gpgme_release(ctx);
 503                 return NULL;
 504         }
 505
 506         g_node_unlink(decinfo->node);
 507         procmime_mimeinfo_free_all(&parseinfo);
 508
 509         decinfo->tmp = TRUE;
 510
 511         if (sigstat != NULL && sigstat->signatures != NULL) {
 512                 if (decinfo->privacy != NULL) {
 513                         data = (PrivacyDataPGP *) decinfo->privacy;
 514                 } else {
 515                         data = smime_new_privacydata();
 516                         if (!data) {
 517                                 gpgme_release(ctx);
 518                                 return NULL;
 519                         }
 520                         decinfo->privacy = (PrivacyData *) data;
 521                 }
 522                 data->done_sigtest = TRUE;
 523                 data->is_signed = TRUE;
 524                 data->sigstatus = sigstat;
 525                 if (data->ctx)
 526                         gpgme_release(data->ctx);
 527                 data->ctx = ctx;
 528         } else
 529                 gpgme_release(ctx);
 530
 531
 532
 533         return decinfo;
 534 }
 535
 536 gboolean smime_sign(MimeInfo *mimeinfo, PrefsAccount *account, const gchar *from_addr)
 537 {
 538         MimeInfo *msgcontent, *sigmultipart, *newinfo;
 539         gchar *textstr, *micalg = NULL;
 540         FILE *fp;
 541         gchar *boundary = NULL;
 542         gchar *sigcontent;
 543         gpgme_ctx_t ctx;
 544         gpgme_data_t gpgtext, gpgsig;
 545         gpgme_error_t err;
 546         size_t len;
 547         struct passphrase_cb_info_s info;
 548         gpgme_sign_result_t result = NULL;
 549         gchar *test_msg;
 550         gchar *real_content = NULL;
 551
 552         fp = my_tmpfile();
 553         if (fp == NULL) {
 554                 perror("my_tmpfile");
 555                 return FALSE;
 556         }
 557         procmime_write_mimeinfo(mimeinfo, fp);
 558         rewind(fp);
 559
 560         /* read temporary file into memory */
 561         test_msg = file_read_stream_to_str(fp);
 562         fclose(fp);
 563
 564         memset (&info, 0, sizeof info);
 565
 566         /* remove content node from message */
 567         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 568         g_node_unlink(msgcontent->node);
 569
 570         /* create temporary multipart for content */
 571         sigmultipart = procmime_mimeinfo_new();
 572         sigmultipart->type = MIMETYPE_MULTIPART;
 573         sigmultipart->subtype = g_strdup("signed");
 574
 575         do {
 576                 if (boundary)
 577                         g_free(boundary);
 578                 boundary = generate_mime_boundary("Sig");
 579         } while (strstr(test_msg, boundary) != NULL);
 580
 581         g_free(test_msg);
 582
 583         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
 584                             g_strdup(boundary));
 585         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("protocol"),
 586                             g_strdup("application/pkcs7-signature"));
 587         g_node_append(sigmultipart->node, msgcontent->node);
 588         g_node_append(mimeinfo->node, sigmultipart->node);
 589
 590         /* write message content to temporary file */
 591         fp = my_tmpfile();
 592         if (fp == NULL) {
 593                 perror("my_tmpfile");
 594                 return FALSE;
 595         }
 596         procmime_write_mimeinfo(sigmultipart, fp);
 597         rewind(fp);
 598
 599         /* read temporary file into memory */
 600         textstr = get_canonical_content(fp, boundary);
 601
 602         g_free(boundary);
 603
 604         fclose(fp);
 605
 606         gpgme_data_new_from_mem(&gpgtext, textstr, textstr?strlen(textstr):0, 0);
 607         gpgme_data_new(&gpgsig);
 608         gpgme_new(&ctx);
 609         gpgme_set_armor(ctx, TRUE);
 610         gpgme_signers_clear (ctx);
 611
 612         err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
 613
 614         if (err) {
 615                 debug_print ("gpgme_set_protocol failed: %s\n",
 616                    gpgme_strerror (err));
 617                 gpgme_data_release(gpgtext);
 618                 gpgme_release(ctx);
 619                 return FALSE;
 620         }
 621
 622         if (!sgpgme_setup_signers(ctx, account, from_addr)) {
 623                 debug_print("setup_signers failed\n");
 624                 gpgme_data_release(gpgtext);
 625                 gpgme_release(ctx);
 626                 return FALSE;
 627         }
 628
 629         info.c = ctx;
 630         prefs_gpg_enable_agent(TRUE);
 631         gpgme_set_passphrase_cb (ctx, NULL, &info);
 632
 633         err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_DETACH);
 634         if (err != GPG_ERR_NO_ERROR) {
 635                 alertpanel_error("S/MIME : Cannot sign, %s (%d)", gpg_strerror(err), gpg_err_code(err));
 636                 gpgme_data_release(gpgtext);
 637                 gpgme_release(ctx);
 638                 return FALSE;
 639         }
 640         result = gpgme_op_sign_result(ctx);
 641         if (result && result->signatures) {
 642             if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 643                 gchar *down_algo = g_ascii_strdown(gpgme_hash_algo_name(
 644                             result->signatures->hash_algo), -1);
 645                 micalg = g_strdup_printf("pgp-%s", down_algo);
 646                 g_free(down_algo);
 647             } else {
 648                 micalg = g_strdup(gpgme_hash_algo_name(
 649                             result->signatures->hash_algo));
 650             }
 651         } else {
 652             /* can't get result (maybe no signing key?) */
 653             debug_print("gpgme_op_sign_result error\n");
 654             return FALSE;
 655         }
 656
 657         gpgme_release(ctx);
 658         sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
 659         gpgme_data_release(gpgtext);
 660         g_free(textstr);
 661
 662         if (!sigcontent) {
 663                 gpgme_release(ctx);
 664                 g_free(micalg);
 665                 return FALSE;
 666         }
 667         real_content = sigcontent+strlen("-----BEGIN SIGNED MESSAGE-----\n");
 668         if (!strstr(real_content, "-----END SIGNED MESSAGE-----")) {
 669                 debug_print("missing end\n");
 670                 gpgme_release(ctx);
 671                 g_free(micalg);
 672                 return FALSE;
 673         }
 674         *strstr(real_content, "-----END SIGNED MESSAGE-----") = '\0';
 675         /* add signature */
 676         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
 677                             micalg);
 678
 679         newinfo = procmime_mimeinfo_new();
 680         newinfo->type = MIMETYPE_APPLICATION;
 681         newinfo->subtype = g_strdup("pkcs7-signature");
 682         g_hash_table_insert(newinfo->typeparameters, g_strdup("name"),
 683                              g_strdup("smime.p7s"));
 684         newinfo->content = MIMECONTENT_MEM;
 685         newinfo->disposition = DISPOSITIONTYPE_ATTACHMENT;
 686         g_hash_table_insert(newinfo->dispositionparameters, g_strdup("filename"),
 687                             g_strdup("smime.p7s"));
 688         newinfo->data.mem = g_malloc(len + 1);
 689         g_memmove(newinfo->data.mem, real_content, len);
 690         newinfo->data.mem[len] = '\0';
 691         newinfo->encoding_type = ENC_BASE64;
 692         g_node_append(sigmultipart->node, newinfo->node);
 693
 694         g_free(sigcontent);
 695
 696         return TRUE;
 697 }
 698 gchar *smime_get_encrypt_data(GSList *recp_names)
 699 {
 700         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_CMS);
 701 }
 702
 703 static const gchar *smime_get_encrypt_warning(void)
 704 {
 705         if (prefs_gpg_should_skip_encryption_warning(smime_system.id))
 706                 return NULL;
 707         else
 708                 return _("Please note that email headers, like Subject, "
 709                          "are not encrypted by the S/MIME system.");
 710 }
 711
 712 static void smime_inhibit_encrypt_warning(gboolean inhibit)
 713 {
 714         if (inhibit)
 715                 prefs_gpg_add_skip_encryption_warning(smime_system.id);
 716         else
 717                 prefs_gpg_remove_skip_encryption_warning(smime_system.id);
 718 }
 719
 720 gboolean smime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
 721 {
 722         MimeInfo *msgcontent, *encmultipart;
 723         FILE *fp;
 724         gchar *enccontent;
 725         size_t len;
 726         gchar *textstr = NULL;
 727         gpgme_data_t gpgtext = NULL, gpgenc = NULL;
 728         gpgme_ctx_t ctx = NULL;
 729         gpgme_key_t *kset = NULL;
 730         gchar **fprs = g_strsplit(encrypt_data, " ", -1);
 731         gint i = 0;
 732         gpgme_error_t err;
 733         gchar *tmpfile = NULL;
 734
 735         while (fprs[i] && strlen(fprs[i])) {
 736                 i++;
 737         }
 738
 739         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 740                 debug_print ("gpgme_new failed: %s\n", gpgme_strerror(err));
 741                 return FALSE;
 742         }
 743
 744         err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
 745
 746         if (err) {
 747                 debug_print ("gpgme_set_protocol failed: %s\n",
 748                    gpgme_strerror (err));
 749                 return FALSE;
 750         }
 751
 752         kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
 753         memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
 754         i = 0;
 755
 756         while (fprs[i] && strlen(fprs[i])) {
 757                 gpgme_key_t key;
 758                 gpgme_error_t err;
 759                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
 760                 if (err) {
 761                         debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
 762                         break;
 763                 }
 764                 debug_print("found %s at %d\n", fprs[i], i);
 765                 kset[i] = key;
 766                 i++;
 767         }
 768
 769         debug_print("Encrypting message content\n");
 770
 771         /* remove content node from message */
 772         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 773         g_node_unlink(msgcontent->node);
 774
 775
 776         /* create temporary multipart for content */
 777         encmultipart = procmime_mimeinfo_new();
 778         encmultipart->type = MIMETYPE_APPLICATION;
 779         encmultipart->subtype = g_strdup("x-pkcs7-mime");
 780         g_hash_table_insert(encmultipart->typeparameters, g_strdup("name"),
 781                             g_strdup("smime.p7m"));
 782         g_hash_table_insert(encmultipart->typeparameters,
 783                             g_strdup("smime-type"),
 784                             g_strdup("enveloped-data"));
 785
 786         encmultipart->disposition = DISPOSITIONTYPE_ATTACHMENT;
 787         g_hash_table_insert(encmultipart->dispositionparameters, g_strdup("filename"),
 788                             g_strdup("smime.p7m"));
 789
 790         g_node_append(encmultipart->node, msgcontent->node);
 791
 792         /* write message content to temporary file */
 793         tmpfile = get_tmp_file();
 794         fp = g_fopen(tmpfile, "wb");
 795         if (fp == NULL) {
 796                 perror("get_tmp_file");
 797                 g_free(kset);
 798                 return FALSE;
 799         }
 800         procmime_decode_content(msgcontent);
 801         procmime_write_mime_header(msgcontent, fp);
 802         procmime_write_mimeinfo(msgcontent, fp);
 803         fclose(fp);
 804         canonicalize_file_replace(tmpfile);
 805         fp = g_fopen(tmpfile, "rb");
 806         if (fp == NULL) {
 807                 perror("get_tmp_file");
 808                 g_free(kset);
 809                 return FALSE;
 810         }
 811         g_free(tmpfile);
 812
 813         /* read temporary file into memory */
 814         textstr = fp_read_noconv(fp);
 815
 816         fclose(fp);
 817
 818         /* encrypt data */
 819         gpgme_data_new_from_mem(&gpgtext, textstr, textstr?strlen(textstr):0, 0);
 820         gpgme_data_new(&gpgenc);
 821         cm_gpgme_data_rewind(gpgtext);
 822
 823         gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
 824
 825         gpgme_release(ctx);
 826         g_free(kset);
 827         enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
 828
 829         if (!enccontent) {
 830                 g_warning("no enccontent");
 831                 return FALSE;
 832         }
 833
 834         tmpfile = get_tmp_file();
 835         fp = g_fopen(tmpfile, "wb");
 836         if (fp) {
 837                 if (fwrite(enccontent, 1, len, fp) < len) {
 838                         FILE_OP_ERROR(tmpfile, "fwrite");
 839                         fclose(fp);
 840                         claws_unlink(tmpfile);
 841                         g_free(tmpfile);
 842                         g_free(enccontent);
 843                         return FALSE;
 844                 }
 845                 if (fclose(fp) == EOF) {
 846                         FILE_OP_ERROR(tmpfile, "fclose");
 847                         claws_unlink(tmpfile);
 848                         g_free(tmpfile);
 849                         g_free(enccontent);
 850                         return FALSE;
 851                 }
 852         } else {
 853                 perror("get_tmp_file");
 854                 g_free(tmpfile);
 855                 g_free(enccontent);
 856                 return FALSE;
 857         }
 858         gpgme_data_release(gpgtext);
 859         g_free(textstr);
 860
 861         /* create encrypted multipart */
 862         procmime_mimeinfo_free_all(&msgcontent);
 863         g_node_append(mimeinfo->node, encmultipart->node);
 864
 865         encmultipart->content = MIMECONTENT_FILE;
 866         encmultipart->data.filename = tmpfile;
 867         procmime_encode_content(encmultipart, ENC_BASE64);
 868
 869         g_free(enccontent);
 870
 871         return TRUE;
 872 }
 873
 874 static PrivacySystem smime_system = {
 875         "smime",                        /* id */
 876         "S-MIME",                       /* name */
 877
 878         smime_free_privacydata, /* free_privacydata */
 879
 880         smime_is_signed,                /* is_signed(MimeInfo *) */
 881         smime_check_signature,  /* check_signature(MimeInfo *) */
 882         smime_get_sig_status,           /* get_sig_status(MimeInfo *) */
 883         smime_get_sig_info_short,       /* get_sig_info_short(MimeInfo *) */
 884         smime_get_sig_info_full,        /* get_sig_info_full(MimeInfo *) */
 885
 886         smime_is_encrypted,             /* is_encrypted(MimeInfo *) */
 887         smime_decrypt,                  /* decrypt(MimeInfo *) */
 888
 889         TRUE,
 890         smime_sign,
 891
 892         TRUE,
 893         smime_get_encrypt_data,
 894         smime_encrypt,
 895         smime_get_encrypt_warning,
 896         smime_inhibit_encrypt_warning,
 897         prefs_gpg_auto_check_signatures,
 898 };
 899
 900 void smime_init()
 901 {
 902         privacy_register_system(&smime_system);
 903 }
 904
 905 void smime_done()
 906 {
 907         privacy_unregister_system(&smime_system);
 908 }
 909
 910 struct PluginFeature *plugin_provides(void)
 911 {
 912         static struct PluginFeature features[] =
 913                 { {PLUGIN_PRIVACY, N_("S/MIME")},
 914                   {PLUGIN_NOTHING, NULL}};
 915         return features;
 916 }
 917 #endif /* USE_GPGME */