+/*
+ * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
+ * Copyright (C) 1999-2007 Colin Leroy <colin@colino.net> and
+ * the Claws Mail team
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#ifdef USE_GPGME
+
+#include "defs.h"
+#include <glib.h>
+#include <gpgme.h>
+#include <ctype.h>
+#include <glib/gi18n.h>
+
+#include "utils.h"
+#include "privacy.h"
+#include "procmime.h"
+
+#include "smime.h"
+#include <plugins/pgpcore/sgpgme.h>
+#include <plugins/pgpcore/prefs_gpg.h>
+#include <plugins/pgpcore/passphrase.h>
+
+#include "alertpanel.h"
+#include "prefs_common.h"
+#include "procmime.h"
+#include "plugin.h"
+
+typedef struct _PrivacyDataPGP PrivacyDataPGP;
+
+struct _PrivacyDataPGP
+{
+ PrivacyData data;
+
+ gboolean done_sigtest;
+ gboolean is_signed;
+ gpgme_verify_result_t sigstatus;
+ gpgme_ctx_t ctx;
+};
+
+static PrivacySystem smime_system;
+
+static gint smime_check_signature(MimeInfo *mimeinfo);
+
+static PrivacyDataPGP *smime_new_privacydata()
+{
+ PrivacyDataPGP *data;
+
+ data = g_new0(PrivacyDataPGP, 1);
+ data->data.system = &smime_system;
+ data->done_sigtest = FALSE;
+ data->is_signed = FALSE;
+ data->sigstatus = NULL;
+ gpgme_new(&data->ctx);
+
+ return data;
+}
+
+static void smime_free_privacydata(PrivacyData *_data)
+{
+ PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
+ gpgme_release(data->ctx);
+ g_free(data);
+}
+
+static gboolean smime_is_signed(MimeInfo *mimeinfo)
+{
+ MimeInfo *parent;
+ MimeInfo *signature;
+ const gchar *protocol, *tmpstr;
+ PrivacyDataPGP *data = NULL;
+
+ g_return_val_if_fail(mimeinfo != NULL, FALSE);
+ if (mimeinfo->privacy != NULL) {
+ data = (PrivacyDataPGP *) mimeinfo->privacy;
+ if (data->done_sigtest)
+ return data->is_signed;
+ }
+
+ if (!g_ascii_strcasecmp(mimeinfo->subtype, "pkcs7-mime") ||
+ !g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
+ tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
+ if (tmpstr && !g_ascii_strcasecmp(tmpstr, "signed-data")) {
+ if (data == NULL) {
+ data = smime_new_privacydata();
+ mimeinfo->privacy = (PrivacyData *) data;
+ }
+
+ data->done_sigtest = TRUE;
+ data->is_signed = TRUE;
+ smime_check_signature(mimeinfo);
+ return TRUE;
+ }
+ }
+
+ /* check parent */
+ parent = procmime_mimeinfo_parent(mimeinfo);
+ if (parent == NULL)
+ return FALSE;
+
+ if ((parent->type != MIMETYPE_MULTIPART) ||
+ g_ascii_strcasecmp(parent->subtype, "signed"))
+ return FALSE;
+ protocol = procmime_mimeinfo_get_parameter(parent, "protocol");
+ if ((protocol == NULL) ||
+ (g_ascii_strcasecmp(protocol, "application/pkcs7-signature") &&
+ g_ascii_strcasecmp(protocol, "application/x-pkcs7-signature")))
+ return FALSE;
+
+ /* check if mimeinfo is the first child */
+ if (parent->node->children->data != mimeinfo)
+ return FALSE;
+
+
+ /* check signature */
+ signature = parent->node->children->next != NULL ?
+ (MimeInfo *) parent->node->children->next->data : NULL;
+ if (signature == NULL)
+ return FALSE;
+ if ((signature->type != MIMETYPE_APPLICATION) ||
+ (g_ascii_strcasecmp(signature->subtype, "pkcs7-signature") &&
+ g_ascii_strcasecmp(signature->subtype, "x-pkcs7-signature")))
+ return FALSE;
+
+ if (data == NULL) {
+ data = smime_new_privacydata();
+ mimeinfo->privacy = (PrivacyData *) data;
+ }
+
+ data->done_sigtest = TRUE;
+ data->is_signed = TRUE;
+
+ return TRUE;
+}
+
+static gchar *get_canonical_content(FILE *fp, const gchar *boundary)
+{
+ gchar *ret;
+ GString *textbuffer;
+ guint boundary_len = 0;
+ gchar buf[BUFFSIZE];
+
+ if (boundary) {
+ boundary_len = strlen(boundary);
+ while (fgets(buf, sizeof(buf), fp) != NULL)
+ if (IS_BOUNDARY(buf, boundary, boundary_len))
+ break;
+ }
+
+ textbuffer = g_string_new("");
+ while (fgets(buf, sizeof(buf), fp) != NULL) {
+ gchar *buf2;
+
+ if (boundary && IS_BOUNDARY(buf, boundary, boundary_len))
+ break;
+
+ buf2 = canonicalize_str(buf);
+ g_string_append(textbuffer, buf2);
+ g_free(buf2);
+ }
+ g_string_truncate(textbuffer, textbuffer->len - 2);
+
+ ret = textbuffer->str;
+ g_string_free(textbuffer, FALSE);
+
+ return ret;
+}
+
+static gint smime_check_signature(MimeInfo *mimeinfo)
+{
+ PrivacyDataPGP *data;
+ MimeInfo *parent, *signature;
+ FILE *fp;
+ gchar *boundary;
+ gchar *textstr = NULL;
+ const gchar *tmpstr;
+ gpgme_data_t sigdata = NULL, textdata = NULL;
+ gpgme_error_t err;
+ g_return_val_if_fail(mimeinfo != NULL, -1);
+ g_return_val_if_fail(mimeinfo->privacy != NULL, -1);
+ data = (PrivacyDataPGP *) mimeinfo->privacy;
+ gpgme_new(&data->ctx);
+ EncodingType oldenc = ENC_BINARY;
+
+ debug_print("Checking S/MIME signature\n");
+
+ err = gpgme_set_protocol(data->ctx, GPGME_PROTOCOL_CMS);
+
+ if (err) {
+ debug_print ("gpgme_set_protocol failed: %s\n",
+ gpgme_strerror (err));
+ }
+ parent = procmime_mimeinfo_parent(mimeinfo);
+
+ fp = g_fopen(parent->data.filename, "rb");
+ g_return_val_if_fail(fp != NULL, SIGNATURE_INVALID);
+
+ boundary = g_hash_table_lookup(parent->typeparameters, "boundary");
+ if (!boundary) {
+ gchar *tmpfile = get_tmp_file();
+ debug_print("no boundary\n");
+ if (tmpfile) {
+ if (mimeinfo->encoding_type != ENC_BASE64) {
+ procmime_encode_content(mimeinfo, ENC_BASE64);
+ }
+ oldenc = mimeinfo->encoding_type;
+ if (mimeinfo->encoding_type == ENC_BASE64)
+ mimeinfo->encoding_type = ENC_BINARY;
+ if (procmime_get_part(tmpfile, mimeinfo) == 0) {
+ textstr = file_read_to_str(tmpfile);
+ } else {
+ textstr = NULL;
+ }
+ if (mimeinfo->encoding_type != oldenc)
+ mimeinfo->encoding_type = oldenc;
+ }
+ g_free(tmpfile);
+ } else {
+ textstr = get_canonical_content(fp, boundary);
+ }
+ err = gpgme_data_new_from_mem(&textdata, textstr, strlen(textstr), 0);
+
+ if (err) {
+ debug_print ("gpgme_data_new_from_mem failed: %s\n",
+ gpgme_strerror (err));
+ }
+
+ if (!g_ascii_strcasecmp(mimeinfo->subtype, "pkcs7-mime") ||
+ !g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
+ tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
+ if (tmpstr && !g_ascii_strcasecmp(tmpstr, "signed-data")) {
+ gpgme_data_t cipher;
+ size_t len;
+ if (oldenc == ENC_BASE64)
+ gpgme_data_set_encoding (textdata, GPGME_DATA_ENCODING_BASE64);
+ gpgme_data_new(&cipher);
+ data->sigstatus =
+ sgpgme_verify_signature (data->ctx, textdata, NULL, cipher);
+ gpgme_data_release(textdata);
+ g_free(textstr);
+ gpgme_data_rewind(cipher);
+ textstr = sgpgme_data_release_and_get_mem(cipher, &len);
+ fclose(fp);
+ if (textstr && len > 0)
+ textstr[len-1]='\0';
+
+ if (textstr && len) {
+ gchar *tmp_file = get_tmp_file();
+ MimeInfo *newinfo = NULL, *decinfo = NULL, *parentinfo = NULL;
+ gint childnumber = 0;
+
+ str_write_to_file(textstr, tmp_file);
+ newinfo = procmime_scan_file(tmp_file);
+ decinfo = g_node_first_child(newinfo->node) != NULL ?
+ g_node_first_child(newinfo->node)->data : NULL;
+ g_node_unlink(decinfo->node);
+ procmime_mimeinfo_free_all(newinfo);
+ decinfo->tmp = TRUE;
+ parentinfo = procmime_mimeinfo_parent(mimeinfo);
+ childnumber = g_node_child_index(parentinfo->node, mimeinfo);
+ if (parentinfo->type == MIMETYPE_MESSAGE &&
+ !strcmp(parentinfo->subtype, "rfc822")) {
+ procmime_decode_content(parentinfo);
+ procmime_encode_content(parentinfo, ENC_BASE64);
+ procmime_encode_content(parentinfo, ENC_8BIT);
+ if (parentinfo->content == MIMECONTENT_MEM) {
+ gint newlen =
+ (gint)(strstr(parentinfo->data.mem, "\n\n") - parentinfo->data.mem);
+ if (newlen > 0)
+ parentinfo->length = newlen;
+ }
+ }
+ g_node_prepend(parentinfo->node, decinfo->node);
+ return 0;
+ } else {
+ return -1;
+ }
+ }
+ }
+
+ signature = (MimeInfo *) mimeinfo->node->next->data;
+ sigdata = sgpgme_data_from_mimeinfo(signature);
+
+ err = 0;
+ if (signature->encoding_type == ENC_BASE64) {
+ err = gpgme_data_set_encoding (sigdata, GPGME_DATA_ENCODING_BASE64);
+ }
+
+ if (err) {
+ debug_print ("gpgme_data_set_encoding failed: %s\n",
+ gpgme_strerror (err));
+ }
+
+ data->sigstatus =
+ sgpgme_verify_signature (data->ctx, sigdata, textdata, NULL);
+
+ gpgme_data_release(sigdata);
+ gpgme_data_release(textdata);
+ g_free(textstr);
+ fclose(fp);
+
+ return 0;
+}
+
+static SignatureStatus smime_get_sig_status(MimeInfo *mimeinfo)
+{
+ PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
+
+ g_return_val_if_fail(data != NULL, SIGNATURE_INVALID);
+
+ if (data->sigstatus == NULL &&
+ prefs_gpg_get_config()->auto_check_signatures)
+ smime_check_signature(mimeinfo);
+
+ return sgpgme_sigstat_gpgme_to_privacy(data->ctx, data->sigstatus);
+}
+
+static gchar *smime_get_sig_info_short(MimeInfo *mimeinfo)
+{
+ PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
+
+ g_return_val_if_fail(data != NULL, g_strdup("Error"));
+
+ if (data->sigstatus == NULL &&
+ prefs_gpg_get_config()->auto_check_signatures)
+ smime_check_signature(mimeinfo);
+
+ return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
+}
+
+static gchar *smime_get_sig_info_full(MimeInfo *mimeinfo)
+{
+ PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
+
+ g_return_val_if_fail(data != NULL, g_strdup("Error"));
+
+ if (data->sigstatus == NULL &&
+ prefs_gpg_get_config()->auto_check_signatures)
+ smime_check_signature(mimeinfo);
+
+ return sgpgme_sigstat_info_full(data->ctx, data->sigstatus);
+}
+
+static gboolean smime_is_encrypted(MimeInfo *mimeinfo)
+{
+ const gchar *tmpstr;
+
+ if (mimeinfo->type != MIMETYPE_APPLICATION)
+ return FALSE;
+ if (!g_ascii_strcasecmp(mimeinfo->subtype, "pkcs7-mime")) {
+ tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
+ if (tmpstr && g_ascii_strcasecmp(tmpstr, "enveloped-data"))
+ return FALSE;
+ else
+ return TRUE;
+
+ } else if (!g_ascii_strcasecmp(mimeinfo->subtype, "x-pkcs7-mime")) {
+ tmpstr = procmime_mimeinfo_get_parameter(mimeinfo, "smime-type");
+ if (tmpstr && g_ascii_strcasecmp(tmpstr, "enveloped-data"))
+ return FALSE;
+ else
+ return TRUE;
+ }
+ return FALSE;
+}
+
+static MimeInfo *smime_decrypt(MimeInfo *mimeinfo)
+{
+ MimeInfo *encinfo, *decinfo, *parseinfo;
+ gpgme_data_t cipher = NULL, plain = NULL;
+ static gint id = 0;
+ FILE *dstfp;
+ gchar *fname;
+ gpgme_verify_result_t sigstat = NULL;
+ PrivacyDataPGP *data = NULL;
+ gpgme_ctx_t ctx;
+ gpgme_error_t err;
+ gchar *chars;
+ size_t len;
+
+ g_return_val_if_fail(smime_is_encrypted(mimeinfo), NULL);
+
+ if ((err = gpgme_new(&ctx)) != GPG_ERR_NO_ERROR) {
+ privacy_set_error(_("Couldn't initialize GPG context, %s"), gpgme_strerror(err));
+ return NULL;
+ }
+
+ err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
+ if (err) {
+ debug_print ("gpgme_set_protocol failed: %s\n",
+ gpgme_strerror (err));
+ privacy_set_error(_("Couldn't set GPG protocol, %s"), gpgme_strerror(err));
+ gpgme_release(ctx);
+ return NULL;
+ }
+ gpgme_set_armor(ctx, TRUE);
+
+ encinfo = mimeinfo;
+
+ cipher = sgpgme_data_from_mimeinfo(encinfo);
+ gpgme_data_set_encoding(cipher, GPGME_DATA_ENCODING_BASE64);
+ plain = sgpgme_decrypt_verify(cipher, &sigstat, ctx);
+
+ gpgme_data_release(cipher);
+ if (plain == NULL) {
+ debug_print("plain is null!\n");
+ gpgme_release(ctx);
+ return NULL;
+ }
+
+ fname = g_strdup_printf("%s%cplaintext.%08x",
+ get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
+
+ if ((dstfp = g_fopen(fname, "wb")) == NULL) {
+ FILE_OP_ERROR(fname, "fopen");
+ g_free(fname);
+ gpgme_data_release(plain);
+ gpgme_release(ctx);
+ debug_print("can't open!\n");
+ privacy_set_error(_("Couldn't open temporary file"));
+ return NULL;
+ }
+
+ if (fprintf(dstfp, "MIME-Version: 1.0\n") < 0) {
+ FILE_OP_ERROR(fname, "fprintf");
+ g_free(fname);
+ gpgme_data_release(plain);
+ gpgme_release(ctx);
+ debug_print("can't close!\n");
+ privacy_set_error(_("Couldn't write to temporary file"));
+ return NULL;
+ }
+
+ chars = sgpgme_data_release_and_get_mem(plain, &len);
+
+ if (len > 0) {
+ if (fwrite(chars, 1, len, dstfp) < len) {
+ FILE_OP_ERROR(fname, "fwrite");
+ g_free(fname);
+ g_free(chars);
+ gpgme_data_release(plain);
+ gpgme_release(ctx);
+ debug_print("can't write!\n");
+ privacy_set_error(_("Couldn't write to temporary file"));
+ return NULL;
+ }
+ }
+ if (fclose(dstfp) == EOF) {
+ FILE_OP_ERROR(fname, "fclose");
+ g_free(fname);
+ g_free(chars);
+ gpgme_data_release(plain);
+ gpgme_release(ctx);
+ debug_print("can't close!\n");
+ privacy_set_error(_("Couldn't close temporary file"));
+ return NULL;
+ }
+ g_free(chars);
+
+ parseinfo = procmime_scan_file(fname);
+ g_free(fname);
+ if (parseinfo == NULL) {
+ privacy_set_error(_("Couldn't parse decrypted file."));
+ gpgme_release(ctx);
+ return NULL;
+ }
+ decinfo = g_node_first_child(parseinfo->node) != NULL ?
+ g_node_first_child(parseinfo->node)->data : NULL;
+ if (decinfo == NULL) {
+ privacy_set_error(_("Couldn't parse decrypted file parts."));
+ gpgme_release(ctx);
+ return NULL;
+ }
+
+ g_node_unlink(decinfo->node);
+ procmime_mimeinfo_free_all(parseinfo);
+
+ decinfo->tmp = TRUE;
+
+ if (sigstat != NULL && sigstat->signatures != NULL) {
+ if (decinfo->privacy != NULL) {
+ data = (PrivacyDataPGP *) decinfo->privacy;
+ } else {
+ data = smime_new_privacydata();
+ decinfo->privacy = (PrivacyData *) data;
+ }
+ data->done_sigtest = TRUE;
+ data->is_signed = TRUE;
+ data->sigstatus = sigstat;
+ if (data->ctx)
+ gpgme_release(data->ctx);
+ data->ctx = ctx;
+ } else
+ gpgme_release(ctx);
+
+
+
+ return decinfo;
+}
+
+gboolean smime_sign(MimeInfo *mimeinfo, PrefsAccount *account)
+{
+ MimeInfo *msgcontent, *sigmultipart, *newinfo;
+ gchar *textstr, *micalg;
+ FILE *fp;
+ gchar *boundary = NULL;
+ gchar *sigcontent;
+ gpgme_ctx_t ctx;
+ gpgme_data_t gpgtext, gpgsig;
+ gpgme_error_t err;
+ size_t len;
+ struct passphrase_cb_info_s info;
+ gpgme_sign_result_t result = NULL;
+ gchar *test_msg;
+ gchar *real_content = NULL;
+
+ fp = my_tmpfile();
+ if (fp == NULL) {
+ perror("my_tmpfile");
+ return FALSE;
+ }
+ procmime_write_mimeinfo(mimeinfo, fp);
+ rewind(fp);
+
+ /* read temporary file into memory */
+ test_msg = file_read_stream_to_str(fp);
+ fclose(fp);
+
+ memset (&info, 0, sizeof info);
+
+ /* remove content node from message */
+ msgcontent = (MimeInfo *) mimeinfo->node->children->data;
+ g_node_unlink(msgcontent->node);
+
+ /* create temporary multipart for content */
+ sigmultipart = procmime_mimeinfo_new();
+ sigmultipart->type = MIMETYPE_MULTIPART;
+ sigmultipart->subtype = g_strdup("signed");
+
+ do {
+ if (boundary)
+ g_free(boundary);
+ boundary = generate_mime_boundary("Sig");
+ } while (strstr(test_msg, boundary) != NULL);
+
+ g_free(test_msg);
+
+ g_hash_table_insert(sigmultipart->typeparameters, g_strdup("boundary"),
+ g_strdup(boundary));
+ g_hash_table_insert(sigmultipart->typeparameters, g_strdup("protocol"),
+ g_strdup("application/pkcs7-signature"));
+ g_node_append(sigmultipart->node, msgcontent->node);
+ g_node_append(mimeinfo->node, sigmultipart->node);
+
+ /* write message content to temporary file */
+ fp = my_tmpfile();
+ if (fp == NULL) {
+ perror("my_tmpfile");
+ return FALSE;
+ }
+ procmime_write_mimeinfo(sigmultipart, fp);
+ rewind(fp);
+
+ /* read temporary file into memory */
+ textstr = get_canonical_content(fp, boundary);
+
+ g_free(boundary);
+
+ fclose(fp);
+
+ gpgme_data_new_from_mem(&gpgtext, textstr, strlen(textstr), 0);
+ gpgme_data_new(&gpgsig);
+ gpgme_new(&ctx);
+ gpgme_set_armor(ctx, TRUE);
+ gpgme_signers_clear (ctx);
+
+ err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
+
+ if (err) {
+ debug_print ("gpgme_set_protocol failed: %s\n",
+ gpgme_strerror (err));
+ gpgme_data_release(gpgtext);
+ gpgme_release(ctx);
+ return FALSE;
+ }
+
+ if (!sgpgme_setup_signers(ctx, account)) {
+ debug_print("setup_signers failed\n");
+ gpgme_data_release(gpgtext);
+ gpgme_release(ctx);
+ return FALSE;
+ }
+
+ info.c = ctx;
+ prefs_gpg_enable_agent(TRUE);
+ gpgme_set_passphrase_cb (ctx, NULL, &info);
+
+ err = gpgme_op_sign(ctx, gpgtext, gpgsig, GPGME_SIG_MODE_DETACH);
+ if (err != GPG_ERR_NO_ERROR) {
+ alertpanel_error("S/MIME : Cannot sign, %s (%d)", gpg_strerror(err), gpg_err_code(err));
+ gpgme_data_release(gpgtext);
+ gpgme_release(ctx);
+ return FALSE;
+ }
+ result = gpgme_op_sign_result(ctx);
+ if (result && result->signatures) {
+ if (gpgme_get_protocol(ctx) == GPGME_PROTOCOL_OpenPGP) {
+ micalg = g_strdup_printf("PGP-%s", gpgme_hash_algo_name(
+ result->signatures->hash_algo));
+ } else {
+ micalg = g_strdup(gpgme_hash_algo_name(
+ result->signatures->hash_algo));
+ }
+ } else {
+ /* can't get result (maybe no signing key?) */
+ debug_print("gpgme_op_sign_result error\n");
+ return FALSE;
+ }
+
+ gpgme_release(ctx);
+ sigcontent = sgpgme_data_release_and_get_mem(gpgsig, &len);
+ gpgme_data_release(gpgtext);
+ g_free(textstr);
+
+ if (!sigcontent) {
+ gpgme_release(ctx);
+ return FALSE;
+ }
+ real_content = sigcontent+strlen("-----BEGIN SIGNED MESSAGE-----\n");
+ if (!strstr(real_content, "-----END SIGNED MESSAGE-----")) {
+ debug_print("missing end\n");
+ gpgme_release(ctx);
+ return FALSE;
+ }
+ *strstr(real_content, "-----END SIGNED MESSAGE-----") = '\0';
+ /* add signature */
+ g_hash_table_insert(sigmultipart->typeparameters, g_strdup("micalg"),
+ micalg);
+
+ newinfo = procmime_mimeinfo_new();
+ newinfo->type = MIMETYPE_APPLICATION;
+ newinfo->subtype = g_strdup("pkcs7-signature");
+ g_hash_table_insert(newinfo->typeparameters, g_strdup("name"),
+ g_strdup("smime.p7s"));
+ newinfo->content = MIMECONTENT_MEM;
+ newinfo->disposition = DISPOSITIONTYPE_ATTACHMENT;
+ g_hash_table_insert(newinfo->dispositionparameters, g_strdup("filename"),
+ g_strdup("smime.p7s"));
+ newinfo->data.mem = g_malloc(len + 1);
+ g_memmove(newinfo->data.mem, real_content, len);
+ newinfo->data.mem[len] = '\0';
+ newinfo->encoding_type = ENC_BASE64;
+ g_node_append(sigmultipart->node, newinfo->node);
+
+ g_free(sigcontent);
+
+ return TRUE;
+}
+gchar *smime_get_encrypt_data(GSList *recp_names)
+{
+ return sgpgme_get_encrypt_data(recp_names, GPGME_PROTOCOL_CMS);
+}
+
+static const gchar *smime_get_encrypt_warning(void)
+{
+ if (prefs_gpg_should_skip_encryption_warning(smime_system.id))
+ return NULL;
+ else
+ return _("Please note that email headers, like Subject, "
+ "are not encrypted by the S/MIME system.");
+}
+
+static void smime_inhibit_encrypt_warning(gboolean inhibit)
+{
+ if (inhibit)
+ prefs_gpg_add_skip_encryption_warning(smime_system.id);
+ else
+ prefs_gpg_remove_skip_encryption_warning(smime_system.id);
+}
+
+static gchar *fp_read_noconv(FILE *fp)
+{
+ GByteArray *array;
+ guchar buf[BUFSIZ];
+ gint n_read;
+ gchar *result = NULL;
+
+ if (!fp)
+ return NULL;
+ array = g_byte_array_new();
+
+ while ((n_read = fread(buf, sizeof(gchar), sizeof(buf), fp)) > 0) {
+ if (n_read < sizeof(buf) && ferror(fp))
+ break;
+ g_byte_array_append(array, buf, n_read);
+ }
+
+ if (ferror(fp)) {
+ FILE_OP_ERROR("file stream", "fread");
+ g_byte_array_free(array, TRUE);
+ return NULL;
+ }
+
+ buf[0] = '\0';
+ g_byte_array_append(array, buf, 1);
+ result = (gchar *)array->data;
+ g_byte_array_free(array, FALSE);
+
+ return result;
+}
+
+gboolean smime_encrypt(MimeInfo *mimeinfo, const gchar *encrypt_data)
+{
+ MimeInfo *msgcontent, *encmultipart;
+ FILE *fp;
+ gchar *enccontent;
+ size_t len;
+ gchar *textstr = NULL;
+ gpgme_data_t gpgtext = NULL, gpgenc = NULL;
+ gpgme_ctx_t ctx = NULL;
+ gpgme_key_t *kset = NULL;
+ gchar **fprs = g_strsplit(encrypt_data, " ", -1);
+ gint i = 0;
+ gpgme_error_t err;
+ gchar *tmpfile = NULL;
+
+ while (fprs[i] && strlen(fprs[i])) {
+ i++;
+ }
+
+ gpgme_new(&ctx);
+
+ err = gpgme_set_protocol(ctx, GPGME_PROTOCOL_CMS);
+
+ if (err) {
+ debug_print ("gpgme_set_protocol failed: %s\n",
+ gpgme_strerror (err));
+ return FALSE;
+ }
+
+ kset = g_malloc(sizeof(gpgme_key_t)*(i+1));
+ memset(kset, 0, sizeof(gpgme_key_t)*(i+1));
+ i = 0;
+
+ while (fprs[i] && strlen(fprs[i])) {
+ gpgme_key_t key;
+ gpgme_error_t err;
+ err = gpgme_get_key(ctx, fprs[i], &key, 0);
+ if (err) {
+ debug_print("can't add key '%s'[%d] (%s)\n", fprs[i],i, gpgme_strerror(err));
+ break;
+ }
+ debug_print("found %s at %d\n", fprs[i], i);
+ kset[i] = key;
+ i++;
+ }
+
+ debug_print("Encrypting message content\n");
+
+ /* remove content node from message */
+ msgcontent = (MimeInfo *) mimeinfo->node->children->data;
+ g_node_unlink(msgcontent->node);
+
+
+ /* create temporary multipart for content */
+ encmultipart = procmime_mimeinfo_new();
+ encmultipart->type = MIMETYPE_APPLICATION;
+ encmultipart->subtype = g_strdup("x-pkcs7-mime");
+ g_hash_table_insert(encmultipart->typeparameters, g_strdup("name"),
+ g_strdup("smime.p7m"));
+
+ encmultipart->disposition = DISPOSITIONTYPE_ATTACHMENT;
+ g_hash_table_insert(encmultipart->dispositionparameters, g_strdup("filename"),
+ g_strdup("smime.p7m"));
+
+ g_node_append(encmultipart->node, msgcontent->node);
+
+ /* write message content to temporary file */
+ tmpfile = get_tmp_file();
+ fp = fopen(tmpfile, "wb");
+ if (fp == NULL) {
+ perror("get_tmp_file");
+ return FALSE;
+ }
+ procmime_decode_content(msgcontent);
+ procmime_write_mime_header(msgcontent, fp);
+ procmime_write_mimeinfo(msgcontent, fp);
+ fclose(fp);
+ canonicalize_file_replace(tmpfile);
+ fp = fopen(tmpfile, "rb");
+ if (fp == NULL) {
+ perror("get_tmp_file");
+ return FALSE;
+ }
+ g_free(tmpfile);
+
+ /* read temporary file into memory */
+ textstr = fp_read_noconv(fp);
+
+ fclose(fp);
+
+ /* encrypt data */
+ gpgme_data_new_from_mem(&gpgtext, textstr, strlen(textstr), 0);
+ gpgme_data_new(&gpgenc);
+ gpgme_data_rewind(gpgtext);
+
+ gpgme_data_set_encoding(gpgenc, GPGME_DATA_ENCODING_BASE64);
+ gpgme_op_encrypt(ctx, kset, GPGME_ENCRYPT_ALWAYS_TRUST, gpgtext, gpgenc);
+
+ gpgme_release(ctx);
+ enccontent = sgpgme_data_release_and_get_mem(gpgenc, &len);
+
+ if (!enccontent) {
+ g_warning("no enccontent\n");
+ return FALSE;
+ }
+
+ tmpfile = get_tmp_file();
+ fp = fopen(tmpfile, "wb");
+ if (fp) {
+ if (fwrite(enccontent, 1, len, fp) < len) {
+ FILE_OP_ERROR(tmpfile, "fwrite");
+ fclose(fp);
+ claws_unlink(tmpfile);
+ g_free(tmpfile);
+ return FALSE;
+ }
+ if (fclose(fp) == EOF) {
+ FILE_OP_ERROR(tmpfile, "fclose");
+ claws_unlink(tmpfile);
+ g_free(tmpfile);
+ return FALSE;
+ }
+ } else {
+ perror("get_tmp_file");
+ g_free(tmpfile);
+ return FALSE;
+ }
+ gpgme_data_release(gpgtext);
+ g_free(textstr);
+
+ /* create encrypted multipart */
+ procmime_mimeinfo_free_all(msgcontent);
+ g_node_append(mimeinfo->node, encmultipart->node);
+
+ encmultipart->content = MIMECONTENT_FILE;
+ encmultipart->data.filename = tmpfile;
+ procmime_encode_content(encmultipart, ENC_BASE64);
+
+ g_free(enccontent);
+
+ return TRUE;
+}
+
+static PrivacySystem smime_system = {
+ "smime", /* id */
+ "S-MIME", /* name */
+
+ smime_free_privacydata, /* free_privacydata */
+
+ smime_is_signed, /* is_signed(MimeInfo *) */
+ smime_check_signature, /* check_signature(MimeInfo *) */
+ smime_get_sig_status, /* get_sig_status(MimeInfo *) */
+ smime_get_sig_info_short, /* get_sig_info_short(MimeInfo *) */
+ smime_get_sig_info_full, /* get_sig_info_full(MimeInfo *) */
+
+ smime_is_encrypted, /* is_encrypted(MimeInfo *) */
+ smime_decrypt, /* decrypt(MimeInfo *) */
+
+ TRUE,
+ smime_sign,
+
+ TRUE,
+ smime_get_encrypt_data,
+ smime_encrypt,
+ smime_get_encrypt_warning,
+ smime_inhibit_encrypt_warning,
+};
+
+void smime_init()
+{
+ privacy_register_system(&smime_system);
+}
+
+void smime_done()
+{
+ privacy_unregister_system(&smime_system);
+}
+
+struct PluginFeature *plugin_provides(void)
+{
+ static struct PluginFeature features[] =
+ { {PLUGIN_PRIVACY, N_("S/MIME")},
+ {PLUGIN_NOTHING, NULL}};
+ return features;
+}
+#endif /* USE_GPGME */
projects / claws.git / commitdiff