src/plugins/pgpmime/pgpmime.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2015 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 <glib/gi18n.h>
  29 #include <gpgme.h>
  30 #include <ctype.h>
  31 #include <errno.h>
  32
  33 #include "utils.h"
  34 #include "privacy.h"
  35 #include "procmime.h"
  36 #include "plugin.h"
  37
  38 #include "pgpmime.h"
  39 #include <plugins/pgpcore/sgpgme.h>
  40 #include <plugins/pgpcore/prefs_gpg.h>
  41 #include <plugins/pgpcore/passphrase.h>
  42 #include <plugins/pgpcore/pgp_utils.h>
  43
  44 #include "prefs_common.h"
  45
  46 typedef struct _PrivacyDataPGP PrivacyDataPGP;
  47
  48 struct _PrivacyDataPGP
  49 {
  50         PrivacyData     data;
  51
  52         gboolean        done_sigtest;
  53         gboolean        is_signed;
  54         gpgme_verify_result_t   sigstatus;
  55         gpgme_ctx_t     ctx;
  56 };
  57
  58 static PrivacySystem pgpmime_system;
  59
  60 static gint pgpmime_check_signature(MimeInfo *mimeinfo);
  61
  62 static PrivacyDataPGP *pgpmime_new_privacydata()
  63 {
  64         PrivacyDataPGP *data;
  65         gpgme_error_t err;
  66
  67         data = g_new0(PrivacyDataPGP, 1);
  68         data->data.system = &pgpmime_system;
  69         data->done_sigtest = FALSE;
  70         data->is_signed = FALSE;
  71         data->sigstatus = NULL;
  72         if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
  73                 g_warning("Couldn't initialize GPG context: %s", gpgme_strerror(err));
  74                 return NULL;
  75         }
  76
  77         return data;
  78 }
  79
  80 static void pgpmime_free_privacydata(PrivacyData *_data)
  81 {
  82         PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
  83         gpgme_release(data->ctx);
  84         g_free(data);
  85 }
  86
  87 static gboolean pgpmime_is_signed(MimeInfo *mimeinfo)
  88 {
  89         MimeInfo *parent;
  90         MimeInfo *signature;
  91         const gchar *protocol;
  92         PrivacyDataPGP *data = NULL;
  93
  94         cm_return_val_if_fail(mimeinfo != NULL, FALSE);
  95         if (mimeinfo->privacy != NULL) {
  96                 data = (PrivacyDataPGP *) mimeinfo->privacy;
  97                 if (data->done_sigtest)
  98                         return data->is_signed;
  99         }
 100
 101         /* check parent */
 102         parent = procmime_mimeinfo_parent(mimeinfo);
 103         if (parent == NULL)
 104                 return FALSE;
 105         if ((parent->type != MIMETYPE_MULTIPART) ||
 106             g_ascii_strcasecmp(parent->subtype, "signed"))
 107                 return FALSE;
 108         protocol = procmime_mimeinfo_get_parameter(parent, "protocol");
 109         if ((protocol == NULL) ||
 110             (g_ascii_strcasecmp(protocol, "application/pgp-signature")))
 111                 return FALSE;
 112
 113         /* check if mimeinfo is the first child */
 114         if (parent->node->children->data != mimeinfo)
 115                 return FALSE;
 116
 117         /* check signature */
 118         signature = parent->node->children->next != NULL ?
 119             (MimeInfo *) parent->node->children->next->data : NULL;
 120         if (signature == NULL)
 121                 return FALSE;
 122         if ((signature->type != MIMETYPE_APPLICATION) ||
 123             (g_ascii_strcasecmp(signature->subtype, "pgp-signature")))
 124                 return FALSE;
 125
 126         if (data == NULL) {
 127                 data = pgpmime_new_privacydata();
 128                 mimeinfo->privacy = (PrivacyData *) data;
 129         }
 130         if (data != NULL) {
 131                 data->done_sigtest = TRUE;
 132                 data->is_signed = TRUE;
 133         }
 134
 135         return TRUE;
 136 }
 137
 138 static gchar *get_canonical_content(FILE *fp, const gchar *boundary)
 139 {
 140         gchar *ret;
 141         GString *textbuffer;
 142         guint boundary_len;
 143         gchar buf[BUFFSIZE];
 144
 145         boundary_len = strlen(boundary);
 146         while (fgets(buf, sizeof(buf), fp) != NULL)
 147                 if (IS_BOUNDARY(buf, boundary, boundary_len))
 148                         break;
 149
 150         textbuffer = g_string_new("");
 151         while (fgets(buf, sizeof(buf), fp) != NULL) {
 152                 gchar *buf2;
 153
 154                 if (IS_BOUNDARY(buf, boundary, boundary_len))
 155                         break;
 156
 157                 buf2 = canonicalize_str(buf);
 158                 g_string_append(textbuffer, buf2);
 159                 g_free(buf2);
 160         }
 161         g_string_truncate(textbuffer, textbuffer->len - 2);
 162
 163         ret = textbuffer->str;
 164         g_string_free(textbuffer, FALSE);
 165
 166         return ret;
 167 }
 168
 169 static gint pgpmime_check_signature(MimeInfo *mimeinfo)
 170 {
 171         PrivacyDataPGP *data;
 172         MimeInfo *parent, *signature;
 173         FILE *fp;
 174         gchar *boundary;
 175         gchar *textstr;
 176         gpgme_data_t sigdata = NULL, textdata = NULL;
 177         gpgme_error_t err;
 178         cm_return_val_if_fail(mimeinfo != NULL, -1);
 179         cm_return_val_if_fail(mimeinfo->privacy != NULL, -1);
 180         data = (PrivacyDataPGP *) mimeinfo->privacy;
 181         if ((err = gpgme_new(&data->ctx)) != GPG_ERR_NO_ERROR) {
 182                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 183                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 184                 return 0;
 185         }
 186
 187
 188         debug_print("Checking PGP/MIME signature\n");
 189
 190         err = gpgme_set_protocol(data->ctx, GPGME_PROTOCOL_OpenPGP);
 191
 192         if (err) {
 193                 debug_print ("gpgme_set_protocol failed: %s\n",
 194                    gpgme_strerror (err));
 195         }
 196         parent = procmime_mimeinfo_parent(mimeinfo);
 197
 198         fp = g_fopen(parent->data.filename, "rb");
 199         cm_return_val_if_fail(fp != NULL, SIGNATURE_INVALID);
 200
 201         boundary = g_hash_table_lookup(parent->typeparameters, "boundary");
 202         if (!boundary) {
 203                 privacy_set_error(_("Signature boundary not found."));
 204                 fclose(fp);
 205                 return 0;
 206         }
 207         textstr = get_canonical_content(fp, boundary);
 208
 209         err = gpgme_data_new_from_mem(&textdata, textstr, (size_t)strlen(textstr), 0);
 210         if (err) {
 211                 debug_print ("gpgme_data_new_from_mem failed: %s\n",
 212                    gpgme_strerror (err));
 213         }
 214         signature = (MimeInfo *) mimeinfo->node->next->data;
 215         sigdata = sgpgme_data_from_mimeinfo(signature);
 216
 217         err = 0;
 218         if (signature->encoding_type == ENC_BASE64) {
 219                 err = gpgme_data_set_encoding (sigdata, GPGME_DATA_ENCODING_BASE64);
 220         }
 221
 222         if (err) {
 223                 debug_print ("gpgme_data_set_encoding failed: %s\n",
 224                         gpgme_strerror (err));
 225         }
 226
 227         data->sigstatus =
 228                 sgpgme_verify_signature (data->ctx, sigdata, textdata, NULL);
 229
 230         gpgme_data_release(sigdata);
 231         gpgme_data_release(textdata);
 232         g_free(textstr);
 233         fclose(fp);
 234
 235         return 0;
 236 }
 237
 238 static SignatureStatus pgpmime_get_sig_status(MimeInfo *mimeinfo)
 239 {
 240         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 241
 242         cm_return_val_if_fail(data != NULL, SIGNATURE_INVALID);
 243
 244         return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
 245 }
 246
 247 static gchar *pgpmime_get_sig_info_short(MimeInfo *mimeinfo)
 248 {
 249         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 250
 251         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 252
 253         return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
 254 }
 255
 256 static gchar *pgpmime_get_sig_info_full(MimeInfo *mimeinfo)
 257 {
 258         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 259
 260         cm_return_val_if_fail(data != NULL, g_strdup("Error"));
 261
 262         return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
 263 }
 264
 265 static gboolean pgpmime_is_encrypted(MimeInfo *mimeinfo)
 266 {
 267         MimeInfo *tmpinfo;
 268         const gchar *tmpstr;
 269         const gchar *begin_indicator = "-----BEGIN PGP MESSAGE-----";
 270         const gchar *end_indicator = "-----END PGP MESSAGE-----";
 271         gchar *textdata;
 272
 273         if (mimeinfo->type != MIMETYPE_MULTIPART)
 274                 return FALSE;
 275         if (g_ascii_strcasecmp(mimeinfo->subtype, "encrypted"))
 276                 return FALSE;
 277         tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "protocol");
 278         if ((tmpstr == NULL) || g_ascii_strcasecmp(tmpstr, "application/pgp-encrypted"))
 279                 return FALSE;
 280         if (g_node_n_children(mimeinfo->node) != 2)
 281                 return FALSE;
 282
 283         tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 0)->data;
 284         if (tmpinfo->type != MIMETYPE_APPLICATION)
 285                 return FALSE;
 286         if (g_ascii_strcasecmp(tmpinfo->subtype, "pgp-encrypted"))
 287                 return FALSE;
 288
 289         tmpinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
 290         if (tmpinfo->type != MIMETYPE_APPLICATION)
 291                 return FALSE;
 292         if (g_ascii_strcasecmp(tmpinfo->subtype, "octet-stream"))
 293                 return FALSE;
 294
 295         textdata = get_part_as_string(tmpinfo);
 296         if (!textdata)
 297                 return FALSE;
 298
 299         if (!pgp_locate_armor_header(textdata, begin_indicator)) {
 300                 g_free(textdata);
 301                 return FALSE;
 302         }
 303         if (!pgp_locate_armor_header(textdata, end_indicator)) {
 304                 g_free(textdata);
 305                 return FALSE;
 306         }
 307
 308         g_free(textdata);
 309
 310         return TRUE;
 311 }
 312
 313 static MimeInfo *pgpmime_decrypt(MimeInfo *mimeinfo)
 314 {
 315         MimeInfo *encinfo, *decinfo, *parseinfo;
 316         gpgme_data_t cipher = NULL, plain = NULL;
 317         static gint id = 0;
 318         FILE *dstfp;
 319         gchar *fname;
 320         gpgme_verify_result_t sigstat = NULL;
 321         PrivacyDataPGP *data = NULL;
 322         gpgme_ctx_t ctx;
 323         gchar *chars;
 324         size_t len;
 325         gpgme_error_t err;
 326
 327         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 328                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 329                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 330                 return NULL;
 331         }
 332
 333         cm_return_val_if_fail(pgpmime_is_encrypted(mimeinfo), NULL);
 334
 335         encinfo = (MimeInfo *) g_node_nth_child(mimeinfo->node, 1)->data;
 336
 337         cipher = sgpgme_data_from_mimeinfo(encinfo);
 338         plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
 339
 340         gpgme_data_release(cipher);
 341         if (plain == NULL) {
 342                 debug_print("plain is null!\n");
 343                 gpgme_release(ctx);
 344                 return NULL;
 345         }
 346
 347         fname = g_strdup_printf("%s%cplaintext.%08x",
 348                 get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
 349
 350         if ((dstfp = g_fopen(fname, "wb")) == NULL) {
 351                 FILE_OP_ERROR(fname, "fopen");
 352                 privacy_set_error(_("Couldn't open decrypted file %s"), fname);
 353                 g_free(fname);
 354                 gpgme_data_release(plain);
 355                 gpgme_release(ctx);
 356                 debug_print("can't open!\n");
 357                 return NULL;
 358         }
 359
 360         if (fprintf(dstfp, "MIME-Version: 1.0\n") < 0) {
 361                 FILE_OP_ERROR(fname, "fprintf");
 362                 fclose(dstfp);
 363                 privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 364                 g_free(fname);
 365                 gpgme_data_release(plain);
 366                 gpgme_release(ctx);
 367                 debug_print("can't open!\n");
 368                 return NULL;
 369         }
 370
 371         chars = sgpgme_data_release_and_get_mem(plain, &len);
 372         if (len > 0) {
 373                 if (fwrite(chars, 1, len, dstfp) < len) {
 374                         FILE_OP_ERROR(fname, "fwrite");
 375                         g_free(chars);
 376                         fclose(dstfp);
 377                         privacy_set_error(_("Couldn't write to decrypted file %s"), fname);
 378                         g_free(fname);
 379                         gpgme_data_release(plain);
 380                         gpgme_release(ctx);
 381                         debug_print("can't open!\n");
 382                         return NULL;
 383                 }
 384         }
 385         g_free(chars);
 386
 387         if (fclose(dstfp) == EOF) {
 388                 FILE_OP_ERROR(fname, "fclose");
 389                 privacy_set_error(_("Couldn't close decrypted file %s"), fname);
 390                 g_free(fname);
 391                 gpgme_data_release(plain);
 392                 gpgme_release(ctx);
 393                 debug_print("can't open!\n");
 394                 return NULL;
 395         }
 396
 397         parseinfo = procmime_scan_file(fname);
 398         g_free(fname);
 399         if (parseinfo == NULL) {
 400                 gpgme_release(ctx);
 401                 privacy_set_error(_("Couldn't parse decrypted file."));
 402                 return NULL;
 403         }
 404         decinfo = g_node_first_child(parseinfo->node) != NULL ?
 405                 g_node_first_child(parseinfo->node)->data : NULL;
 406         if (decinfo == NULL) {
 407                 privacy_set_error(_("Couldn't parse decrypted file parts."));
 408                 gpgme_release(ctx);
 409                 return NULL;
 410         }
 411
 412         g_node_unlink(decinfo->node);
 413         procmime_mimeinfo_free_all(&parseinfo);
 414
 415         decinfo->tmp = TRUE;
 416
 417         if (sigstat != NULL && sigstat->signatures != NULL) {
 418                 if (decinfo->privacy != NULL) {
 419                         data = (PrivacyDataPGP *) decinfo->privacy;
 420                 } else {
 421                         data = pgpmime_new_privacydata();
 422                         decinfo->privacy = (PrivacyData *) data;
 423                 }
 424                 if (data != NULL) {
 425                         data->done_sigtest = TRUE;
 426                         data->is_signed = TRUE;
 427                         data->sigstatus = sigstat;
 428                         if (data->ctx)
 429                                 gpgme_release(data->ctx);
 430                         data->ctx = ctx;
 431                 }
 432         } else
 433                 gpgme_release(ctx);
 434
 435         return decinfo;
 436 }
 437
 438 gboolean pgpmime_sign(MimeInfo *mimeinfo, PrefsAccount *account, const gchar *from_addr)
 439 {
 440         MimeInfo *msgcontent, *sigmultipart, *newinfo;
 441         gchar *textstr, *micalg = NULL;
 442         FILE *fp;
 443         gchar *boundary = NULL;
 444         gchar *sigcontent;
 445         gpgme_ctx_t ctx;
 446         gpgme_data_t gpgtext, gpgsig;
 447         gpgme_error_t err;
 448         size_t len;
 449         struct passphrase_cb_info_s info;
 450         gpgme_sign_result_t result = NULL;
 451         gchar *test_msg;
 452
 453         fp = my_tmpfile();
 454         if (fp == NULL) {
 455                 privacy_set_error(_("Couldn't create temporary file: %s"), g_strerror(errno));
 456                 return FALSE;
 457         }
 458         procmime_write_mimeinfo(mimeinfo, fp);
 459         rewind(fp);
 460
 461         /* read temporary file into memory */
 462         test_msg = file_read_stream_to_str(fp);
 463         fclose(fp);
 464
 465         memset (&info, 0, sizeof info);
 466
 467         /* remove content node from message */
 468         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 469         g_node_unlink(msgcontent->node);
 470
 471         /* create temporary multipart for content */
 472         sigmultipart = procmime_mimeinfo_new();
 473         sigmultipart->type = MIMETYPE_MULTIPART;
 474         sigmultipart->subtype = g_strdup("signed");
 475
 476         do {
 477                 g_free(boundary);
 478                 boundary = generate_mime_boundary("Sig");
 479         } while (strstr(test_msg, boundary) != NULL);
 480
 481         g_free(test_msg);
 482
 483         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
 484                             g_strdup(boundary));
 485         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("protocol"),
 486                             g_strdup("application/pgp-signature"));
 487         g_node_append(sigmultipart->node, msgcontent->node);
 488         g_node_append(mimeinfo->node, sigmultipart->node);
 489
 490         /* write message content to temporary file */
 491         fp = my_tmpfile();
 492         if (fp == NULL) {
 493                 perror("my_tmpfile");
 494                 privacy_set_error(_("Couldn't create temporary file: %s"), g_strerror(errno));
 495                 return FALSE;
 496         }
 497         procmime_write_mimeinfo(sigmultipart, fp);
 498         rewind(fp);
 499
 500         /* read temporary file into memory */
 501         textstr = get_canonical_content(fp, boundary);
 502
 503         fclose(fp);
 504
 505         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 506         gpgme_data_new(&gpgsig);
 507         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 508                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 509                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 510                 return FALSE;
 511         }
 512         gpgme_set_textmode(ctx, 1);
 513         gpgme_set_armor(ctx, 1);
 514         gpgme_signers_clear (ctx);
 515
 516         if (!sgpgme_setup_signers(ctx, account, from_addr)) {
 517                 gpgme_release(ctx);
 518                 return FALSE;
 519         }
 520
 521         prefs_gpg_enable_agent(prefs_gpg_get_config()->use_gpg_agent);
 522         if (g_getenv("GPG_AGENT_INFO") && prefs_gpg_get_config()->use_gpg_agent) {
 523                 debug_print("GPG_AGENT_INFO environment defined, running without passphrase callback\n");
 524         } else {
 525                 info.c = ctx;
 526                 gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
 527         }
 528
 529         err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_DETACH);
 530         if (err != GPG_ERR_NO_ERROR) {
 531                 if (err == GPG_ERR_CANCELED) {
 532                         /* ignore cancelled signing */
 533                         privacy_reset_error();
 534                         debug_print("gpgme_op_sign cancelled\n");
 535                 } else {
 536                         privacy_set_error(_("Data signing failed, %s"), gpgme_strerror(err));
 537                         debug_print("gpgme_op_sign error : %x\n", err);
 538                 }
 539                 gpgme_release(ctx);
 540                 return FALSE;
 541         }
 542         result = gpgme_op_sign_result(ctx);
 543         if (result && result->signatures) {
 544                 gpgme_new_signature_t sig = result->signatures;
 545                 if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
 546                         gchar *down_algo = g_ascii_strdown(gpgme_hash_algo_name(
 547                                 result->signatures->hash_algo), -1);
 548                         micalg = g_strdup_printf("pgp-%s", down_algo);
 549                         g_free(down_algo);
 550                 } else {
 551                         micalg = g_strdup(gpgme_hash_algo_name(
 552                                 result->signatures->hash_algo));
 553                 }
 554                 while (sig) {
 555                         debug_print("valid signature: %s\n", sig->fpr);
 556                         sig = sig->next;
 557                 }
 558         } else if (result && result->invalid_signers) {
 559                 gpgme_invalid_key_t invalid = result->invalid_signers;
 560                 while (invalid) {
 561                         g_warning("invalid signer: %s (%s)", invalid->fpr,
 562                                 gpgme_strerror(invalid->reason));
 563                         privacy_set_error(_("Data signing failed due to invalid signer: %s"),
 564                                 gpgme_strerror(invalid->reason));
 565                         invalid = invalid->next;
 566                 }
 567                 gpgme_release(ctx);
 568                 return FALSE;
 569         } else {
 570                 /* can't get result (maybe no signing key?) */
 571                 debug_print("gpgme_op_sign_result error\n");
 572                 privacy_set_error(_("Data signing failed, no results."));
 573                 gpgme_release(ctx);
 574                 return FALSE;
 575         }
 576
 577         sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
 578         gpgme_data_release(gpgtext);
 579         g_free(textstr);
 580
 581         if (sigcontent == NULL || len <= 0) {
 582                 g_warning("sgpgme_data_release_and_get_mem failed");
 583                 privacy_set_error(_("Data signing failed, no contents."));
 584                 g_free(micalg);
 585                 g_free(sigcontent);
 586                 return FALSE;
 587         }
 588
 589         /* add signature */
 590         g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
 591                             micalg);
 592
 593         newinfo = procmime_mimeinfo_new();
 594         newinfo->type = MIMETYPE_APPLICATION;
 595         newinfo->subtype = g_strdup("pgp-signature");
 596         newinfo->description = g_strdup(_("OpenPGP digital signature"));
 597         newinfo->content = MIMECONTENT_MEM;
 598         newinfo->data.mem = g_malloc(len + 1);
 599         g_memmove(newinfo->data.mem, sigcontent, len);
 600         newinfo->data.mem[len] = '\0';
 601         g_node_append(sigmultipart->node, newinfo->node);
 602
 603         g_free(sigcontent);
 604         gpgme_release(ctx);
 605
 606         return TRUE;
 607 }
 608 gchar *pgpmime_get_encrypt_data(GSList *recp_names)
 609 {
 610         return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_OpenPGP);
 611 }
 612
 613 static const gchar *pgpmime_get_encrypt_warning(void)
 614 {
 615         if (prefs_gpg_should_skip_encryption_warning(pgpmime_system.id))
 616                 return NULL;
 617         else
 618                 return _("Please note that email headers, like Subject, "
 619                          "are not encrypted by the PGP/Mime system.");
 620 }
 621
 622 static void pgpmime_inhibit_encrypt_warning(gboolean inhibit)
 623 {
 624         if (inhibit)
 625                 prefs_gpg_add_skip_encryption_warning(pgpmime_system.id);
 626         else
 627                 prefs_gpg_remove_skip_encryption_warning(pgpmime_system.id);
 628 }
 629
 630 gboolean pgpmime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
 631 {
 632         MimeInfo *msgcontent, *encmultipart, *newinfo;
 633         FILE *fp;
 634         gchar *boundary, *enccontent;
 635         size_t len;
 636         gchar *textstr;
 637         gpgme_data_t gpgtext = NULL, gpgenc = NULL;
 638         gpgme_ctx_t ctx = NULL;
 639         gpgme_key_t *kset = NULL;
 640         gchar **fprs = g_strsplit(encrypt_data, " ", -1);
 641         gint i = 0;
 642         gpgme_error_t err;
 643
 644         while (fprs[i] && strlen(fprs[i])) {
 645                 i++;
 646         }
 647
 648         kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
 649         memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
 650         if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
 651                 debug_print(("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 652                 privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
 653                 g_free(kset);
 654                 return FALSE;
 655         }
 656         i = 0;
 657         while (fprs[i] && strlen(fprs[i])) {
 658                 gpgme_key_t key;
 659                 err = gpgme_get_key(ctx, fprs[i], &key, 0);
 660                 if (err) {
 661                         debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
 662                         privacy_set_error(_("Couldn't add GPG key %s, %s"), fprs[i], gpgme_strerror(err));
 663                         g_free(kset);
 664                         return FALSE;
 665                 }
 666                 debug_print("found %s at %d\n", fprs[i], i);
 667                 kset[i] = key;
 668                 i++;
 669         }
 670
 671         debug_print("Encrypting message content\n");
 672
 673         /* remove content node from message */
 674         msgcontent = (MimeInfo *) mimeinfo->node->children->data;
 675         g_node_unlink(msgcontent->node);
 676
 677         /* create temporary multipart for content */
 678         encmultipart = procmime_mimeinfo_new();
 679         encmultipart->type = MIMETYPE_MULTIPART;
 680         encmultipart->subtype = g_strdup("encrypted");
 681         boundary = generate_mime_boundary("Encrypt");
 682         g_hash_table_insert(encmultipart->typeparameters, g_strdup("boundary"),
 683                             g_strdup(boundary));
 684         g_hash_table_insert(encmultipart->typeparameters, g_strdup("protocol"),
 685                             g_strdup("application/pgp-encrypted"));
 686         g_node_append(encmultipart->node, msgcontent->node);
 687
 688         /* write message content to temporary file */
 689         fp = my_tmpfile();
 690         if (fp == NULL) {
 691                 privacy_set_error(_("Couldn't create temporary file, %s"), g_strerror(errno));
 692                 g_free(kset);
 693                 return FALSE;
 694         }
 695         procmime_write_mimeinfo(encmultipart, fp);
 696         rewind(fp);
 697
 698         /* read temporary file into memory */
 699         textstr = get_canonical_content(fp, boundary);
 700
 701         fclose(fp);
 702
 703         /* encrypt data */
 704         gpgme_data_new_from_mem(&gpgtext, textstr, (size_t)strlen(textstr), 0);
 705         gpgme_data_new(&gpgenc);
 706         gpgme_set_armor(ctx, 1);
 707         cm_gpgme_data_rewind(gpgtext);
 708
 709         err = gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
 710
 711         enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
 712         gpgme_data_release(gpgtext);
 713         g_free(textstr);
 714         g_free(kset);
 715
 716         if (enccontent == NULL || len <= 0) {
 717                 g_warning("sgpgme_data_release_and_get_mem failed");
 718                 privacy_set_error(_("Encryption failed, %s"), gpgme_strerror(err));
 719                 gpgme_release(ctx);
 720                 g_free(enccontent);
 721                 return FALSE;
 722         }
 723
 724         /* create encrypted multipart */
 725         g_node_unlink(msgcontent->node);
 726         procmime_mimeinfo_free_all(&msgcontent);
 727         g_node_append(mimeinfo->node, encmultipart->node);
 728
 729         newinfo = procmime_mimeinfo_new();
 730         newinfo->type = MIMETYPE_APPLICATION;
 731         newinfo->subtype = g_strdup("pgp-encrypted");
 732         newinfo->content = MIMECONTENT_MEM;
 733         newinfo->data.mem = g_strdup("Version: 1\n");
 734         g_node_append(encmultipart->node, newinfo->node);
 735
 736         newinfo = procmime_mimeinfo_new();
 737         newinfo->type = MIMETYPE_APPLICATION;
 738         newinfo->subtype = g_strdup("octet-stream");
 739         newinfo->content = MIMECONTENT_MEM;
 740         newinfo->data.mem = g_malloc(len + 1);
 741         g_memmove(newinfo->data.mem, enccontent, len);
 742         newinfo->data.mem[len] = '\0';
 743         g_node_append(encmultipart->node, newinfo->node);
 744
 745         g_free(enccontent);
 746         gpgme_release(ctx);
 747
 748         return TRUE;
 749 }
 750
 751 static PrivacySystem pgpmime_system = {
 752         "pgpmime",                      /* id */
 753         "PGP MIME",                     /* name */
 754
 755         pgpmime_free_privacydata,       /* free_privacydata */
 756
 757         pgpmime_is_signed,              /* is_signed(MimeInfo *) */
 758         pgpmime_check_signature,        /* check_signature(MimeInfo *) */
 759         pgpmime_get_sig_status,         /* get_sig_status(MimeInfo *) */
 760         pgpmime_get_sig_info_short,     /* get_sig_info_short(MimeInfo *) */
 761         pgpmime_get_sig_info_full,      /* get_sig_info_full(MimeInfo *) */
 762
 763         pgpmime_is_encrypted,           /* is_encrypted(MimeInfo *) */
 764         pgpmime_decrypt,                /* decrypt(MimeInfo *) */
 765
 766         TRUE,
 767         pgpmime_sign,
 768
 769         TRUE,
 770         pgpmime_get_encrypt_data,
 771         pgpmime_encrypt,
 772         pgpmime_get_encrypt_warning,
 773         pgpmime_inhibit_encrypt_warning,
 774         prefs_gpg_auto_check_signatures,
 775 };
 776
 777 void pgpmime_init()
 778 {
 779         privacy_register_system(&pgpmime_system);
 780 }
 781
 782 void pgpmime_done()
 783 {
 784         privacy_unregister_system(&pgpmime_system);
 785 }
 786
 787 struct PluginFeature *plugin_provides(void)
 788 {
 789         static struct PluginFeature features[] =
 790                 { {PLUGIN_PRIVACY, N_("PGP/Mime")},
 791                   {PLUGIN_NOTHING, NULL}};
 792         return features;
 793 }
 794 #endif /* USE_GPGME */