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