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-rw-r--r--src/rfc2015.c1395
1 files changed, 1395 insertions, 0 deletions
diff --git a/src/rfc2015.c b/src/rfc2015.c
new file mode 100644
index 00000000..9ef38a24
--- /dev/null
+++ b/src/rfc2015.c
@@ -0,0 +1,1395 @@
+/*
+ * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
+ * Copyright (C) 2001 Werner Koch (dd9jn)
+ *
+ * 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#if USE_GPGME
+
+#include "defs.h"
+
+#include <glib.h>
+#include <stdio.h>
+#include <string.h>
+#include <locale.h>
+#include <ctype.h>
+
+#include <gpgme.h>
+
+#include "intl.h"
+#include "procmime.h"
+#include "procheader.h"
+#include "base64.h"
+#include "uuencode.h"
+#include "unmime.h"
+#include "codeconv.h"
+#include "utils.h"
+#include "prefs_common.h"
+#include "passphrase.h"
+#include "select-keys.h"
+#include "sigstatus.h"
+#include "rfc2015.h"
+
+#define DIM(v) (sizeof(v)/sizeof((v)[0]))
+
+static char *content_names[] = {
+ "Content-Type",
+ "Content-Disposition",
+ "Content-Transfer-Encoding",
+ NULL
+};
+
+static char *mime_version_name[] = {
+ "Mime-Version",
+ NULL
+};
+
+#if 0
+static void dump_mimeinfo (const char *text, MimeInfo *x)
+{
+ debug_print ("MimeInfo[%s] %p level=%d\n",
+ text, x, x? x->level:0 );
+ if (!x)
+ return;
+
+ debug_print (" enc=`%s' enc_type=%d mime_type=%d\n",
+ x->encoding, x->encoding_type, x->mime_type );
+ debug_print (" cont_type=`%s' cs=`%s' name=`%s' bnd=`%s'\n",
+ x->content_type, x->charset, x->name, x->boundary );
+ debug_print (" cont_disp=`%s' fname=`%s' fpos=%ld size=%u, lvl=%d\n",
+ x->content_disposition, x->filename, x->fpos, x->size,
+ x->level );
+ dump_mimeinfo (".main", x->main );
+ dump_mimeinfo (".sub", x->sub );
+ dump_mimeinfo (".next", x->next );
+ debug_print ("MimeInfo[.parent] %p\n", x );
+ dump_mimeinfo (".children", x->children );
+ dump_mimeinfo (".plaintext", x->plaintext );
+}
+
+static void dump_part ( MimeInfo *mimeinfo, FILE *fp )
+{
+ unsigned int size = mimeinfo->size;
+ int c;
+
+ if (fseek (fp, mimeinfo->fpos, SEEK_SET)) {
+ debug_print ("dump_part: fseek error\n");
+ return;
+ }
+
+ debug_print ("--- begin dump_part ----\n");
+ while (size-- && (c = getc (fp)) != EOF)
+ putc (c, stderr);
+ if (ferror (fp))
+ debug_print ("dump_part: read error\n");
+ debug_print ("--- end dump_part ----\n");
+}
+#endif
+
+void
+rfc2015_disable_all (void)
+{
+ /* FIXME: set a flag, so that we don't bother the user with failed
+ * gpgme messages */
+}
+
+
+void
+rfc2015_secure_remove (const char *fname)
+{
+ if (!fname)
+ return;
+ /* fixme: overwrite the file first */
+ remove (fname);
+}
+
+
+static const gchar *
+sig_status_to_string (GpgmeSigStat status)
+{
+ const gchar *result;
+
+ switch (status) {
+ case GPGME_SIG_STAT_NONE:
+ result = _("Oops: Signature not verified");
+ break;
+ case GPGME_SIG_STAT_NOSIG:
+ result = _("No signature found");
+ break;
+ case GPGME_SIG_STAT_GOOD:
+ result = _("Good signature");
+ break;
+ case GPGME_SIG_STAT_BAD:
+ result = _("BAD signature");
+ break;
+ case GPGME_SIG_STAT_NOKEY:
+ result = _("No public key to verify the signature");
+ break;
+ case GPGME_SIG_STAT_ERROR:
+ result = _("Error verifying the signature");
+ break;
+ case GPGME_SIG_STAT_DIFF:
+ result = _("Different results for signatures");
+ break;
+ default:
+ result = _("Error: Unknown status");
+ break;
+ }
+
+ return result;
+}
+
+static const gchar *
+sig_status_with_name (GpgmeSigStat status)
+{
+ const gchar *result;
+
+ switch (status) {
+ case GPGME_SIG_STAT_NONE:
+ result = _("Oops: Signature not verified");
+ break;
+ case GPGME_SIG_STAT_NOSIG:
+ result = _("No signature found");
+ break;
+ case GPGME_SIG_STAT_GOOD:
+ result = _("Good signature from \"%s\"");
+ break;
+ case GPGME_SIG_STAT_BAD:
+ result = _("BAD signature from \"%s\"");
+ break;
+ case GPGME_SIG_STAT_NOKEY:
+ result = _("No public key to verify the signature");
+ break;
+ case GPGME_SIG_STAT_ERROR:
+ result = _("Error verifying the signature");
+ break;
+ case GPGME_SIG_STAT_DIFF:
+ result = _("Different results for signatures");
+ break;
+ default:
+ result = _("Error: Unknown status");
+ break;
+ }
+
+ return result;
+}
+
+static void
+sig_status_for_key(GString *str, GpgmeCtx ctx, GpgmeSigStat status,
+ GpgmeKey key, const gchar *fpr)
+{
+ gint idx = 0;
+ const char *uid;
+
+ uid = gpgme_key_get_string_attr (key, GPGME_ATTR_USERID, NULL, idx);
+ if (uid == NULL) {
+ g_string_sprintfa (str, "%s\n",
+ sig_status_to_string (status));
+ if ((fpr != NULL) && (*fpr != '\0'))
+ g_string_sprintfa (str, "Key fingerprint: %s\n", fpr);
+ g_string_append (str, _("Cannot find user ID for this key."));
+ return;
+ }
+ g_string_sprintfa (str, sig_status_with_name (status), uid);
+ g_string_append (str, "\n");
+
+ while (1) {
+ uid = gpgme_key_get_string_attr (key, GPGME_ATTR_USERID,
+ NULL, ++idx);
+ if (uid == NULL)
+ break;
+ g_string_sprintfa (str, _(" aka \"%s\"\n"),
+ uid);
+ }
+}
+
+static gchar *
+sig_status_full (GpgmeCtx ctx)
+{
+ GString *str;
+ gint sig_idx = 0;
+ GpgmeError err;
+ GpgmeSigStat status;
+ GpgmeKey key;
+ const char *fpr;
+ time_t created;
+ struct tm *ctime_val;
+ char ctime_str[80];
+ gchar *retval;
+
+ str = g_string_new ("");
+
+ fpr = gpgme_get_sig_status (ctx, sig_idx, &status, &created);
+ while (fpr != NULL) {
+ if (created != 0) {
+ ctime_val = localtime (&created);
+ strftime (ctime_str, sizeof (ctime_str), "%c",
+ ctime_val);
+ g_string_sprintfa (str,
+ _("Signature made at %s\n"),
+ ctime_str);
+ }
+ err = gpgme_get_sig_key (ctx, sig_idx, &key);
+ if (err != 0) {
+ g_string_sprintfa (str, "%s\n",
+ sig_status_to_string (status));
+ if ((fpr != NULL) && (*fpr != '\0'))
+ g_string_sprintfa (str,
+ _("Key fingerprint: %s\n"),
+ fpr);
+ } else {
+ sig_status_for_key (str, ctx, status, key, fpr);
+ gpgme_key_unref (key);
+ }
+ g_string_append (str, "\n\n");
+
+ fpr = gpgme_get_sig_status (ctx, ++sig_idx, &status, &created);
+ }
+
+ retval = str->str;
+ g_string_free (str, FALSE);
+ return retval;
+}
+
+static void check_signature (MimeInfo *mimeinfo, MimeInfo *partinfo, FILE *fp)
+{
+ GpgmeCtx ctx = NULL;
+ GpgmeError err;
+ GpgmeData sig = NULL, text = NULL;
+ GpgmeSigStat status = GPGME_SIG_STAT_NONE;
+ GpgmegtkSigStatus statuswindow = NULL;
+ const char *result = NULL;
+ gchar *tmp_file;
+ gint n_exclude_chars = 0;
+
+ if (prefs_common.gpg_signature_popup)
+ statuswindow = gpgmegtk_sig_status_create ();
+
+ err = gpgme_new (&ctx);
+ if (err) {
+ debug_print ("gpgme_new failed: %s\n", gpgme_strerror (err));
+ goto leave;
+ }
+
+ /* don't include the last empty line.
+ It does not belong to the signed text */
+ if (mimeinfo->children->size > 0) {
+ if (fseek(fp, mimeinfo->children->fpos + mimeinfo->children->size - 1,
+ SEEK_SET) < 0) {
+ perror("fseek");
+ goto leave;
+ }
+ if (fgetc(fp) == '\n') {
+ n_exclude_chars++;
+ if (mimeinfo->children->size > 1) {
+ if (fseek(fp, mimeinfo->children->fpos + mimeinfo->children->size - 2,
+ SEEK_SET) < 0) {
+ perror("fseek");
+ goto leave;
+ }
+ if (fgetc(fp) == '\r')
+ n_exclude_chars++;
+ }
+ }
+ }
+
+ /* canonicalize the file part. */
+ tmp_file = get_tmp_file();
+ if (copy_file_part(fp, mimeinfo->children->fpos,
+ mimeinfo->children->size - n_exclude_chars,
+ tmp_file) < 0) {
+ g_free(tmp_file);
+ goto leave;
+ }
+ if (canonicalize_file_replace(tmp_file) < 0) {
+ unlink(tmp_file);
+ g_free(tmp_file);
+ goto leave;
+ }
+
+ err = gpgme_data_new_from_file(&text, tmp_file, 1);
+
+ unlink(tmp_file);
+ g_free(tmp_file);
+
+ if (!err)
+ err = gpgme_data_new_from_filepart (&sig, NULL, fp,
+ partinfo->fpos, partinfo->size);
+ if (err) {
+ debug_print ("gpgme_data_new_from_filepart failed: %s\n",
+ gpgme_strerror (err));
+ goto leave;
+ }
+
+ err = gpgme_op_verify (ctx, sig, text, &status);
+ if (err) {
+ debug_print ("gpgme_op_verify failed: %s\n", gpgme_strerror (err));
+ goto leave;
+ }
+
+ /* FIXME: check what the heck this sig_status_full stuff is.
+ * it should better go into sigstatus.c */
+ g_free (partinfo->sigstatus_full);
+ partinfo->sigstatus_full = sig_status_full (ctx);
+
+leave:
+ result = gpgmegtk_sig_status_to_string(status);
+ debug_print("verification status: %s\n", result);
+ if (prefs_common.gpg_signature_popup)
+ gpgmegtk_sig_status_update (statuswindow, ctx);
+
+ g_free (partinfo->sigstatus);
+ partinfo->sigstatus = g_strdup (result);
+
+ gpgme_data_release (sig);
+ gpgme_data_release (text);
+ gpgme_release (ctx);
+ if (prefs_common.gpg_signature_popup)
+ gpgmegtk_sig_status_destroy (statuswindow);
+}
+
+/*
+ * Copy a gpgme data object to a temporary file and
+ * return this filename
+ */
+#if 0
+static char *
+copy_gpgmedata_to_temp (GpgmeData data, guint *length)
+{
+ static int id;
+ char *tmp;
+ FILE *fp;
+ char buf[100];
+ size_t nread;
+ GpgmeError err;
+
+ tmp = g_strdup_printf("%s%cgpgtmp.%08x",
+ get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id );
+
+ if ((fp = fopen(tmp, "wb")) == NULL) {
+ FILE_OP_ERROR(tmp, "fopen");
+ g_free(tmp);
+ return NULL;
+ }
+
+ err = gpgme_data_rewind ( data );
+ if (err)
+ debug_print ("gpgme_data_rewind failed: %s\n", gpgme_strerror (err));
+
+ while (!(err = gpgme_data_read (data, buf, 100, &nread))) {
+ fwrite ( buf, nread, 1, fp );
+ }
+
+ if (err != GPGME_EOF)
+ debug_print ("gpgme_data_read failed: %s\n", gpgme_strerror (err));
+
+ fclose (fp);
+ *length = nread;
+
+ return tmp;
+}
+#endif
+
+static GpgmeData
+pgp_decrypt (MimeInfo *partinfo, FILE *fp)
+{
+ GpgmeCtx ctx = NULL;
+ GpgmeError err;
+ GpgmeData cipher = NULL, plain = NULL;
+ struct passphrase_cb_info_s info;
+
+ memset (&info, 0, sizeof info);
+
+ err = gpgme_new (&ctx);
+ if (err) {
+ debug_print ("gpgme_new failed: %s\n", gpgme_strerror (err));
+ goto leave;
+ }
+
+ err = gpgme_data_new_from_filepart (&cipher, NULL, fp,
+ partinfo->fpos, partinfo->size);
+ if (err) {
+ debug_print ("gpgme_data_new_from_filepart failed: %s\n",
+ gpgme_strerror (err));
+ goto leave;
+ }
+
+ err = gpgme_data_new (&plain);
+ if (err) {
+ debug_print ("gpgme_new failed: %s\n", gpgme_strerror (err));
+ goto leave;
+ }
+
+ if (!getenv("GPG_AGENT_INFO")) {
+ info.c = ctx;
+ gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
+ }
+
+ err = gpgme_op_decrypt (ctx, cipher, plain);
+
+leave:
+ gpgme_data_release (cipher);
+ if (err) {
+ gpgmegtk_free_passphrase();
+ debug_print ("decryption failed: %s\n", gpgme_strerror (err));
+ gpgme_data_release (plain);
+ plain = NULL;
+ }
+ else
+ debug_print ("** decryption succeeded\n");
+
+ gpgme_release (ctx);
+ return plain;
+}
+
+MimeInfo * rfc2015_find_signature (MimeInfo *mimeinfo)
+{
+ MimeInfo *partinfo;
+ int n = 0;
+
+ if (!mimeinfo)
+ return NULL;
+ if (g_strcasecmp (mimeinfo->content_type, "multipart/signed"))
+ return NULL;
+
+ debug_print ("** multipart/signed encountered\n");
+
+ /* check that we have at least 2 parts of the correct type */
+ for (partinfo = mimeinfo->children;
+ partinfo != NULL; partinfo = partinfo->next) {
+ if (++n > 1 && !g_strcasecmp (partinfo->content_type,
+ "application/pgp-signature"))
+ break;
+ }
+
+ return partinfo;
+}
+
+gboolean rfc2015_has_signature (MimeInfo *mimeinfo)
+{
+ return rfc2015_find_signature (mimeinfo) != NULL;
+}
+
+void rfc2015_check_signature (MimeInfo *mimeinfo, FILE *fp)
+{
+ MimeInfo *partinfo;
+
+ partinfo = rfc2015_find_signature (mimeinfo);
+ if (!partinfo)
+ return;
+
+#if 0
+ g_message ("** yep, it is a pgp signature");
+ dump_mimeinfo ("gpg-signature", partinfo );
+ dump_part (partinfo, fp );
+ dump_mimeinfo ("signed text", mimeinfo->children );
+ dump_part (mimeinfo->children, fp);
+#endif
+
+ check_signature (mimeinfo, partinfo, fp);
+}
+
+int rfc2015_is_encrypted (MimeInfo *mimeinfo)
+{
+ if (!mimeinfo || mimeinfo->mime_type != MIME_MULTIPART)
+ return 0;
+ if (g_strcasecmp (mimeinfo->content_type, "multipart/encrypted"))
+ return 0;
+ /* fixme: we should check the protocol parameter */
+ return 1;
+}
+
+gboolean rfc2015_msg_is_encrypted (const gchar *file)
+{
+ FILE *fp;
+ MimeInfo *mimeinfo;
+ int ret;
+
+ if ((fp = fopen(file, "rb")) == NULL)
+ return FALSE;
+
+ mimeinfo = procmime_scan_mime_header(fp);
+ if(!mimeinfo) {
+ fclose(fp);
+ return FALSE;
+ }
+
+ ret = rfc2015_is_encrypted(mimeinfo);
+ procmime_mimeinfo_free_all(mimeinfo);
+ return ret != 0 ? TRUE : FALSE;
+}
+
+static int
+name_cmp(const char *a, const char *b)
+{
+ for( ; *a && *b; a++, b++) {
+ if(*a != *b
+ && toupper(*(unsigned char *)a) != toupper(*(unsigned char *)b))
+ return 1;
+ }
+
+ return *a != *b;
+}
+
+static int
+headerp(char *p, char **names)
+{
+ int i, c;
+ char *p2;
+
+ p2 = strchr(p, ':');
+ if(!p2 || p == p2) {
+ return 0;
+ }
+ if(p2[-1] == ' ' || p2[-1] == '\t') {
+ return 0;
+ }
+
+ if(!names[0])
+ return 1;
+
+ c = *p2;
+ *p2 = 0;
+ for(i = 0 ; names[i] != NULL; i++) {
+ if(!name_cmp (names[i], p))
+ break;
+ }
+ *p2 = c;
+
+ return names[i] != NULL;
+}
+
+
+#define DECRYPTION_ABORT() \
+{ \
+ procmime_mimeinfo_free_all(tmpinfo); \
+ msginfo->decryption_failed = 1; \
+ return; \
+}
+
+void rfc2015_decrypt_message (MsgInfo *msginfo, MimeInfo *mimeinfo, FILE *fp)
+{
+ static int id;
+ MimeInfo *tmpinfo, *partinfo;
+ int ver_ok = 0;
+ char *fname;
+ GpgmeData plain;
+ FILE *dstfp;
+ size_t nread;
+ char buf[BUFFSIZE];
+ int in_cline;
+ GpgmeError err;
+
+ g_return_if_fail (msginfo != NULL);
+ g_return_if_fail (mimeinfo != NULL);
+ g_return_if_fail (fp != NULL);
+ g_return_if_fail (mimeinfo->mime_type == MIME_MULTIPART);
+
+ debug_print ("** decrypting multipart/encrypted message\n");
+
+ /* skip headers */
+ if (fseek(fp, mimeinfo->fpos, SEEK_SET) < 0)
+ perror("fseek");
+ tmpinfo = procmime_scan_mime_header(fp);
+ if (!tmpinfo || tmpinfo->mime_type != MIME_MULTIPART) {
+ DECRYPTION_ABORT();
+ }
+
+ procmime_scan_multipart_message(tmpinfo, fp);
+
+ /* check that we have the 2 parts */
+ partinfo = tmpinfo->children;
+ if (!partinfo || !partinfo->next) {
+ DECRYPTION_ABORT();
+ }
+ if (!g_strcasecmp (partinfo->content_type, "application/pgp-encrypted")) {
+ /* Fixme: check that the version is 1 */
+ ver_ok = 1;
+ }
+ partinfo = partinfo->next;
+ if (ver_ok &&
+ !g_strcasecmp (partinfo->content_type, "application/octet-stream")) {
+ if (partinfo->next)
+ g_warning ("oops: pgp_encrypted with more than 2 parts");
+ }
+ else {
+ DECRYPTION_ABORT();
+ }
+
+ debug_print ("** yep, it is pgp encrypted\n");
+
+ plain = pgp_decrypt (partinfo, fp);
+ if (!plain) {
+ DECRYPTION_ABORT();
+ }
+
+ fname = g_strdup_printf("%s%cplaintext.%08x",
+ get_mime_tmp_dir(), G_DIR_SEPARATOR, ++id);
+
+ if ((dstfp = fopen(fname, "wb")) == NULL) {
+ FILE_OP_ERROR(fname, "fopen");
+ g_free(fname);
+ DECRYPTION_ABORT();
+ }
+
+ /* write the orginal header to the new file */
+ if (fseek(fp, tmpinfo->fpos, SEEK_SET) < 0)
+ perror("fseek");
+
+ in_cline = 0;
+ while (fgets(buf, sizeof(buf), fp)) {
+ if (headerp (buf, content_names)) {
+ in_cline = 1;
+ continue;
+ }
+ if (in_cline) {
+ if (buf[0] == ' ' || buf[0] == '\t')
+ continue;
+ in_cline = 0;
+ }
+ if (buf[0] == '\r' || buf[0] == '\n')
+ break;
+ fputs (buf, dstfp);
+ }
+
+ err = gpgme_data_rewind (plain);
+ if (err)
+ debug_print ("gpgme_data_rewind failed: %s\n", gpgme_strerror (err));
+
+ while (!(err = gpgme_data_read (plain, buf, sizeof(buf), &nread))) {
+ fwrite (buf, nread, 1, dstfp);
+ }
+
+ if (err != GPGME_EOF) {
+ debug_print ("gpgme_data_read failed: %s\n", gpgme_strerror (err));
+ }
+
+ fclose (dstfp);
+ procmime_mimeinfo_free_all(tmpinfo);
+
+ msginfo->plaintext_file = fname;
+ msginfo->decryption_failed = 0;
+}
+
+#undef DECRYPTION_ABORT
+
+
+/*
+ * plain contains an entire mime object.
+ * Encrypt it and return an GpgmeData object with the encrypted version of
+ * the file or NULL in case of error.
+ */
+static GpgmeData
+pgp_encrypt ( GpgmeData plain, GpgmeRecipients rset )
+{
+ GpgmeCtx ctx = NULL;
+ GpgmeError err;
+ GpgmeData cipher = NULL;
+
+ err = gpgme_new (&ctx);
+ if (!err)
+ err = gpgme_data_new (&cipher);
+ if (!err) {
+ gpgme_set_armor (ctx, 1);
+ err = gpgme_op_encrypt (ctx, rset, plain, cipher);
+ }
+
+ if (err) {
+ debug_print ("encryption failed: %s\n", gpgme_strerror (err));
+ gpgme_data_release (cipher);
+ cipher = NULL;
+ }
+ else {
+ debug_print ("** encryption succeeded\n");
+ }
+
+ gpgme_release (ctx);
+ return cipher;
+}
+
+/*
+ * Create and return a list of keys matching a key id
+ */
+
+GSList *rfc2015_create_signers_list (const char *keyid)
+{
+ GSList *key_list = NULL;
+ GpgmeCtx list_ctx = NULL;
+ GSList *p;
+ GpgmeError err;
+ GpgmeKey key;
+
+ err = gpgme_new (&list_ctx);
+ if (err)
+ goto leave;
+ err = gpgme_op_keylist_start (list_ctx, keyid, 1);
+ if (err)
+ goto leave;
+ while ( !(err = gpgme_op_keylist_next (list_ctx, &key)) ) {
+ key_list = g_slist_append (key_list, key);
+ }
+ if (err != GPGME_EOF)
+ goto leave;
+ err = 0;
+ if (key_list == NULL) {
+ debug_print ("no keys found for keyid \"%s\"\n", keyid);
+ }
+
+leave:
+ if (err) {
+ debug_print ("rfc2015_create_signers_list failed: %s\n", gpgme_strerror (err));
+ for (p = key_list; p != NULL; p = p->next)
+ gpgme_key_unref ((GpgmeKey) p->data);
+ g_slist_free (key_list);
+ }
+ if (list_ctx)
+ gpgme_release (list_ctx);
+ return err ? NULL : key_list;
+}
+
+/*
+ * Encrypt the file by extracting all recipients and finding the
+ * encryption keys for all of them. The file content is then replaced
+ * by the encrypted one. */
+int
+rfc2015_encrypt (const char *file, GSList *recp_list, gboolean ascii_armored)
+{
+ FILE *fp = NULL;
+ char buf[BUFFSIZE];
+ int i, clineidx, saved_last;
+ char *clines[3] = {NULL};
+ GpgmeError err;
+ GpgmeData header = NULL;
+ GpgmeData plain = NULL;
+ GpgmeData cipher = NULL;
+ GpgmeRecipients rset = NULL;
+ size_t nread;
+ int mime_version_seen = 0;
+ char *boundary;
+
+ boundary = generate_mime_boundary ("Encrypt");
+
+ /* Create the list of recipients */
+ rset = gpgmegtk_recipient_selection (recp_list);
+ if (!rset) {
+ debug_print ("error creating recipient list\n" );
+ goto failure;
+ }
+
+ /* Open the source file */
+ if ((fp = fopen(file, "rb")) == NULL) {
+ FILE_OP_ERROR(file, "fopen");
+ goto failure;
+ }
+
+ err = gpgme_data_new (&header);
+ if (!err)
+ err = gpgme_data_new (&plain);
+ if (err) {
+ debug_print ("gpgme_data_new failed: %s\n", gpgme_strerror (err));
+ goto failure;
+ }
+
+ /* get the content header lines from the source */
+ clineidx = 0;
+ saved_last = 0;
+ while (!err && fgets(buf, sizeof(buf), fp)) {
+ /* fixme: check for overlong lines */
+ if (headerp (buf, content_names)) {
+ if (clineidx >= DIM (clines)) {
+ debug_print ("rfc2015_encrypt: too many content lines\n");
+ goto failure;
+ }
+ clines[clineidx++] = g_strdup (buf);
+ saved_last = 1;
+ continue;
+ }
+ if (saved_last) {
+ if (*buf == ' ' || *buf == '\t') {
+ char *last = clines[clineidx - 1];
+ clines[clineidx - 1] = g_strconcat (last, buf, NULL);
+ g_free (last);
+ continue;
+ }
+ saved_last = 0;
+ }
+
+ if (headerp (buf, mime_version_name))
+ mime_version_seen = 1;
+
+ if (buf[0] == '\r' || buf[0] == '\n')
+ break;
+ err = gpgme_data_write (header, buf, strlen (buf));
+ }
+ if (ferror (fp)) {
+ FILE_OP_ERROR (file, "fgets");
+ goto failure;
+ }
+
+ /* write them to the temp data and add the rest of the message */
+ for (i = 0; !err && i < clineidx; i++) {
+ debug_print ("%% %s:%d: cline=`%s'", __FILE__ ,__LINE__, clines[i]);
+ err = gpgme_data_write (plain, clines[i], strlen (clines[i]));
+ }
+ if (!err)
+ err = gpgme_data_write (plain, "\r\n", 2);
+ while (!err && fgets(buf, sizeof(buf), fp)) {
+ err = gpgme_data_write (plain, buf, strlen (buf));
+ }
+ if (ferror (fp)) {
+ FILE_OP_ERROR (file, "fgets");
+ goto failure;
+ }
+ if (err) {
+ debug_print ("gpgme_data_write failed: %s\n", gpgme_strerror (err));
+ goto failure;
+ }
+
+ cipher = pgp_encrypt (plain, rset);
+ gpgme_data_release (plain); plain = NULL;
+ gpgme_recipients_release (rset); rset = NULL;
+ if (!cipher)
+ goto failure;
+
+ /* we have the encrypted message available in cipher and now we
+ * are going to rewrite the source file. To be sure that file has
+ * been truncated we use an approach which should work everywhere:
+ * close the file and then reopen it for writing. It is important
+ * that this works, otherwise it may happen that parts of the
+ * plaintext are still in the file (The encrypted stuff is, due to
+ * compression, usually shorter than the plaintext).
+ *
+ * Yes, there is a race condition here, but everyone, who is so
+ * stupid to store the temp file with the plaintext in a public
+ * directory has to live with this anyway. */
+ if (fclose (fp)) {
+ FILE_OP_ERROR(file, "fclose");
+ goto failure;
+ }
+ if ((fp = fopen(file, "wb")) == NULL) {
+ FILE_OP_ERROR(file, "fopen");
+ goto failure;
+ }
+
+ /* Write the header, append new content lines, part 1 and part 2 header */
+ err = gpgme_data_rewind (header);
+ if (err) {
+ debug_print ("gpgme_data_rewind failed: %s\n", gpgme_strerror (err));
+ goto failure;
+ }
+ while (!(err = gpgme_data_read (header, buf, BUFFSIZE, &nread))) {
+ fwrite (buf, nread, 1, fp);
+ }
+ if (err != GPGME_EOF) {
+ debug_print ("gpgme_data_read failed: %s\n", gpgme_strerror (err));
+ goto failure;
+ }
+ if (ferror (fp)) {
+ FILE_OP_ERROR (file, "fwrite");
+ goto failure;
+ }
+ gpgme_data_release (header); header = NULL;
+
+ if (!mime_version_seen)
+ fputs ("MIME-Version: 1\r\n", fp);
+
+ if (ascii_armored) {
+ fprintf(fp,
+ "Content-Type: text/plain; charset=US-ASCII\r\n"
+ "Content-Transfer-Encoding: 7bit\r\n"
+ "\r\n");
+ } else {
+ fprintf (fp,
+ "Content-Type: multipart/encrypted;"
+ " protocol=\"application/pgp-encrypted\";\r\n"
+ " boundary=\"%s\"\r\n"
+ "\r\n"
+ "--%s\r\n"
+ "Content-Type: application/pgp-encrypted\r\n"
+ "\r\n"
+ "Version: 1\r\n"
+ "\r\n"
+ "--%s\r\n"
+ "Content-Type: application/octet-stream\r\n"
+ "\r\n",
+ boundary, boundary, boundary);
+ }
+
+ /* append the encrypted stuff */
+ err = gpgme_data_rewind (cipher);
+ if (err) {
+ debug_print ("** gpgme_data_rewind on cipher failed: %s\n",
+ gpgme_strerror (err));
+ goto failure;
+ }
+
+ while (!(err = gpgme_data_read (cipher, buf, BUFFSIZE, &nread))) {
+ fwrite (buf, nread, 1, fp);
+ }
+ if (err != GPGME_EOF) {
+ debug_print ("** gpgme_data_read failed: %s\n", gpgme_strerror (err));
+ goto failure;
+ }
+
+ /* and the final boundary */
+ if (!ascii_armored) {
+ fprintf (fp,
+ "\r\n"
+ "--%s--\r\n",
+ boundary);
+ }
+ fflush (fp);
+ if (ferror (fp)) {
+ FILE_OP_ERROR (file, "fwrite");
+ goto failure;
+ }
+ fclose (fp);
+ gpgme_data_release (cipher);
+ return 0;
+
+failure:
+ if (fp)
+ fclose (fp);
+ gpgme_data_release (header);
+ gpgme_data_release (plain);
+ gpgme_data_release (cipher);
+ gpgme_recipients_release (rset);
+ g_free (boundary);
+ return -1; /* error */
+}
+
+/*
+ * plain contains an entire mime object. Sign it and return an
+ * GpgmeData object with the signature of it or NULL in case of error.
+ * r_siginfo returns an XML object with information about the signature.
+ */
+static GpgmeData
+pgp_sign (GpgmeData plain, GSList *key_list, gboolean clearsign,
+ char **r_siginfo)
+{
+ GSList *p;
+ GpgmeCtx ctx = NULL;
+ GpgmeError err;
+ GpgmeData sig = NULL;
+ struct passphrase_cb_info_s info;
+
+ *r_siginfo = NULL;
+ memset (&info, 0, sizeof info);
+
+ err = gpgme_new (&ctx);
+ if (err)
+ goto leave;
+ err = gpgme_data_new (&sig);
+ if (err)
+ goto leave;
+
+ if (!getenv("GPG_AGENT_INFO")) {
+ info.c = ctx;
+ gpgme_set_passphrase_cb (ctx, gpgmegtk_passphrase_cb, &info);
+ }
+ gpgme_set_textmode (ctx, 1);
+ gpgme_set_armor (ctx, 1);
+ gpgme_signers_clear (ctx);
+ for (p = key_list; p != NULL; p = p->next) {
+ err = gpgme_signers_add (ctx, (GpgmeKey) p->data);
+ if (err)
+ goto leave;
+ }
+ for (p = key_list; p != NULL; p = p->next)
+ gpgme_key_unref ((GpgmeKey) p->data);
+ g_slist_free (key_list);
+
+ if (err)
+ goto leave;
+ err = gpgme_op_sign
+ (ctx, plain, sig,
+ clearsign ? GPGME_SIG_MODE_CLEAR : GPGME_SIG_MODE_DETACH);
+ if (!err)
+ *r_siginfo = gpgme_get_op_info (ctx, 0);
+
+leave:
+ if (err) {
+ gpgmegtk_free_passphrase();
+ debug_print ("signing failed: %s\n", gpgme_strerror (err));
+ gpgme_data_release (sig);
+ sig = NULL;
+ }
+ else {
+ debug_print ("signing succeeded\n");
+ }
+
+ gpgme_release (ctx);
+ return sig;
+}
+
+/*
+ * Find TAG in XML and return a pointer into xml set just behind the
+ * closing angle. Return NULL if not found.
+ */
+static const char *
+find_xml_tag (const char *xml, const char *tag)
+{
+ int taglen = strlen (tag);
+ const char *s = xml;
+
+ while ( (s = strchr (s, '<')) ) {
+ s++;
+ if (!strncmp (s, tag, taglen)) {
+ const char *s2 = s + taglen;
+ if (*s2 == '>' || isspace (*(const unsigned char*)s2) ) {
+ /* found */
+ while (*s2 && *s2 != '>') /* skip attributes */
+ s2++;
+ /* fixme: do need to handle angles inside attribute vallues? */
+ return *s2? (s2+1):NULL;
+ }
+ }
+ while (*s && *s != '>') /* skip to end of tag */
+ s++;
+ }
+ return NULL;
+}
+
+
+/*
+ * Extract the micalg from an GnupgOperationInfo XML container.
+ */
+static char *
+extract_micalg (char *xml)
+{
+ const char *s;
+
+ s = find_xml_tag (xml, "GnupgOperationInfo");
+ if (s) {
+ const char *s_end = find_xml_tag (s, "/GnupgOperationInfo");
+ s = find_xml_tag (s, "signature");
+ if (s && s_end && s < s_end) {
+ const char *s_end2 = find_xml_tag (s, "/signature");
+ if (s_end2 && s_end2 < s_end) {
+ s = find_xml_tag (s, "micalg");
+ if (s && s < s_end2) {
+ s_end = strchr (s, '<');
+ if (s_end) {
+ char *p = g_malloc (s_end - s + 1);
+ memcpy (p, s, s_end - s);
+ p[s_end-s] = 0;
+ return p;
+ }
+ }
+ }
+ }
+ }
+ return NULL;
+}
+
+
+/*
+ * Sign the file and replace its content with the signed one.
+ */
+int
+rfc2015_sign (const char *file, GSList *key_list)
+{
+ FILE *fp = NULL;
+ char buf[BUFFSIZE];
+ int i, clineidx, saved_last;
+ char *clines[3] = {NULL};
+ GpgmeError err;
+ GpgmeData header = NULL;
+ GpgmeData plain = NULL;
+ GpgmeData sigdata = NULL;
+ size_t nread;
+ int mime_version_seen = 0;
+ char *boundary;
+ char *micalg = NULL;
+ char *siginfo;
+
+ boundary = generate_mime_boundary ("Signature");
+
+ /* Open the source file */
+ if ((fp = fopen(file, "rb")) == NULL) {
+ FILE_OP_ERROR(file, "fopen");
+ goto failure;
+ }
+
+ err = gpgme_data_new (&header);
+ if (!err)
+ err = gpgme_data_new (&plain);
+ if (err) {
+ debug_print ("gpgme_data_new failed: %s\n", gpgme_strerror (err));
+ goto failure;
+ }
+
+ /* get the content header lines from the source */
+ clineidx = 0;
+ saved_last = 0;
+ while (!err && fgets(buf, sizeof(buf), fp)) {
+ /* fixme: check for overlong lines */
+ if (headerp (buf, content_names)) {
+ if (clineidx >= DIM (clines)) {
+ debug_print ("rfc2015_sign: too many content lines\n");
+ goto failure;
+ }
+ clines[clineidx++] = g_strdup (buf);
+ saved_last = 1;
+ continue;
+ }
+ if (saved_last) {
+ if (*buf == ' ' || *buf == '\t') {
+ char *last = clines[clineidx - 1];
+ clines[clineidx - 1] = g_strconcat (last, buf, NULL);
+ g_free (last);
+ continue;
+ }
+ saved_last = 0;
+ }
+
+ if (headerp (buf, mime_version_name))
+ mime_version_seen = 1;
+
+ if (buf[0] == '\r' || buf[0] == '\n')
+ break;
+ err = gpgme_data_write (header, buf, strlen (buf));
+ }
+ if (ferror (fp)) {
+ FILE_OP_ERROR (file, "fgets");
+ goto failure;
+ }
+
+ /* write them to the temp data and add the rest of the message */
+ for (i = 0; !err && i < clineidx; i++) {
+ err = gpgme_data_write (plain, clines[i], strlen (clines[i]));
+ }
+ if (!err)
+ err = gpgme_data_write (plain, "\r\n", 2 );
+ while (!err && fgets(buf, sizeof(buf), fp)) {
+ err = gpgme_data_write (plain, buf, strlen (buf));
+ }
+ if (ferror (fp)) {
+ FILE_OP_ERROR (file, "fgets");
+ goto failure;
+ }
+ if (err) {
+ debug_print ("gpgme_data_write failed: %s\n", gpgme_strerror (err));
+ goto failure;
+ }
+
+ sigdata = pgp_sign (plain, key_list, FALSE, &siginfo);
+ if (siginfo) {
+ micalg = extract_micalg (siginfo);
+ free (siginfo);
+ }
+ if (!sigdata)
+ goto failure;
+
+ /* we have the signed message available in sigdata and now we are
+ * going to rewrite the original file. To be sure that file has
+ * been truncated we use an approach which should work everywhere:
+ * close the file and then reopen it for writing. */
+ if (fclose (fp)) {
+ FILE_OP_ERROR(file, "fclose");
+ goto failure;
+ }
+ if ((fp = fopen(file, "wb")) == NULL) {
+ FILE_OP_ERROR(file, "fopen");
+ goto failure;
+ }
+
+ /* Write the rfc822 header and add new content lines */
+ err = gpgme_data_rewind (header);
+ if (err)
+ debug_print ("gpgme_data_rewind failed: %s\n", gpgme_strerror (err));
+ while (!(err = gpgme_data_read (header, buf, BUFFSIZE, &nread))) {
+ fwrite (buf, nread, 1, fp);
+ }
+ if (err != GPGME_EOF) {
+ debug_print ("gpgme_data_read failed: %s\n", gpgme_strerror (err));
+ goto failure;
+ }
+ if (ferror (fp)) {
+ FILE_OP_ERROR (file, "fwrite");
+ goto failure;
+ }
+ gpgme_data_release (header);
+ header = NULL;
+
+ if (!mime_version_seen)
+ fputs ("MIME-Version: 1.0\r\n", fp);
+ fprintf (fp, "Content-Type: multipart/signed; "
+ "protocol=\"application/pgp-signature\";\r\n");
+ if (micalg)
+ fprintf (fp, " micalg=\"%s\";\r\n", micalg);
+ fprintf (fp, " boundary=\"%s\"\r\n", boundary);
+
+ /* Part 1: signed material */
+ fprintf (fp, "\r\n"
+ "--%s\r\n",
+ boundary);
+ err = gpgme_data_rewind (plain);
+ if (err) {
+ debug_print ("gpgme_data_rewind on plain failed: %s\n",
+ gpgme_strerror (err));
+ goto failure;
+ }
+ while (!(err = gpgme_data_read (plain, buf, BUFFSIZE, &nread))) {
+ fwrite (buf, nread, 1, fp);
+ }
+ if (err != GPGME_EOF) {
+ debug_print ("gpgme_data_read failed: %s\n", gpgme_strerror (err));
+ goto failure;
+ }
+
+ /* Part 2: signature */
+ fprintf (fp, "\r\n"
+ "--%s\r\n",
+ boundary);
+ fputs ("Content-Type: application/pgp-signature\r\n"
+ "\r\n", fp);
+
+ err = gpgme_data_rewind (sigdata);
+ if (err) {
+ debug_print ("gpgme_data_rewind on sigdata failed: %s\n",
+ gpgme_strerror (err));
+ goto failure;
+ }
+
+ while (!(err = gpgme_data_read (sigdata, buf, BUFFSIZE, &nread))) {
+ fwrite (buf, nread, 1, fp);
+ }
+ if (err != GPGME_EOF) {
+ debug_print ("gpgme_data_read failed: %s\n", gpgme_strerror (err));
+ goto failure;
+ }
+
+ /* Final boundary */
+ fprintf (fp, "\r\n"
+ "--%s--\r\n",
+ boundary);
+ fflush (fp);
+ if (ferror (fp)) {
+ FILE_OP_ERROR (file, "fwrite");
+ goto failure;
+ }
+ fclose (fp);
+ gpgme_data_release (header);
+ gpgme_data_release (plain);
+ gpgme_data_release (sigdata);
+ g_free (boundary);
+ g_free (micalg);
+ return 0;
+
+failure:
+ if (fp)
+ fclose (fp);
+ gpgme_data_release (header);
+ gpgme_data_release (plain);
+ gpgme_data_release (sigdata);
+ g_free (boundary);
+ g_free (micalg);
+ return -1; /* error */
+}
+
+
+/*
+ * Sign the file with clear text and replace its content with the signed one.
+ */
+gint
+rfc2015_clearsign (const gchar *file, GSList *key_list)
+{
+ FILE *fp;
+ gchar buf[BUFFSIZE];
+ GpgmeError err;
+ GpgmeData text = NULL;
+ GpgmeData sigdata = NULL;
+ size_t nread;
+ gchar *siginfo;
+
+ if ((fp = fopen(file, "rb")) == NULL) {
+ FILE_OP_ERROR(file, "fopen");
+ goto failure;
+ }
+
+ err = gpgme_data_new(&text);
+ if (err) {
+ debug_print("gpgme_data_new failed: %s\n", gpgme_strerror(err));
+ goto failure;
+ }
+
+ while (!err && fgets(buf, sizeof(buf), fp)) {
+ err = gpgme_data_write(text, buf, strlen(buf));
+ }
+ if (ferror(fp)) {
+ FILE_OP_ERROR(file, "fgets");
+ goto failure;
+ }
+ if (err) {
+ debug_print("gpgme_data_write failed: %s\n", gpgme_strerror(err));
+ goto failure;
+ }
+
+ sigdata = pgp_sign(text, key_list, TRUE, &siginfo);
+ if (siginfo) {
+ g_free(siginfo);
+ }
+ if (!sigdata)
+ goto failure;
+
+ if (fclose(fp) == EOF) {
+ FILE_OP_ERROR(file, "fclose");
+ fp = NULL;
+ goto failure;
+ }
+ if ((fp = fopen(file, "wb")) == NULL) {
+ FILE_OP_ERROR(file, "fopen");
+ goto failure;
+ }
+
+ err = gpgme_data_rewind(sigdata);
+ if (err) {
+ debug_print("gpgme_data_rewind on sigdata failed: %s\n",
+ gpgme_strerror(err));
+ goto failure;
+ }
+
+ while (!(err = gpgme_data_read(sigdata, buf, sizeof(buf), &nread))) {
+ fwrite(buf, nread, 1, fp);
+ }
+ if (err != GPGME_EOF) {
+ debug_print("gpgme_data_read failed: %s\n", gpgme_strerror(err));
+ goto failure;
+ }
+
+ if (fclose(fp) == EOF) {
+ FILE_OP_ERROR(file, "fclose");
+ fp = NULL;
+ goto failure;
+ }
+ gpgme_data_release(text);
+ gpgme_data_release(sigdata);
+ return 0;
+
+failure:
+ if (fp)
+ fclose(fp);
+ gpgme_data_release(text);
+ gpgme_data_release(sigdata);
+ return -1;
+}
+
+#endif /* USE_GPGME */