src/pgpmime.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2003 Hiroyuki Yamamoto & the Sylpheed-Claws 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 2 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, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #  include "config.h"
  22 #endif
  23
  24 #ifdef USE_GPGME
  25
  26 #include "defs.h"
  27 #include <glib.h>
  28 #include <gpgme.h>
  29
  30 #include "utils.h"
  31 #include "privacy.h"
  32 #include "procmime.h"
  33 #include "pgpmime.h"
  34 #include "sgpgme.h"
  35
  36 typedef struct _PrivacyDataPGP PrivacyDataPGP;
  37
  38 struct _PrivacyDataPGP
  39 {
  40         PrivacyData     data;
  41
  42         gboolean        done_sigtest;
  43         gboolean        is_signed;
  44         GpgmeSigStat    sigstatus;
  45         GpgmeCtx        ctx;
  46 };
  47
  48 static PrivacySystem pgpmime_system;
  49
  50 static PrivacyDataPGP *pgpmime_new_privacydata()
  51 {
  52         PrivacyDataPGP *data;
  53
  54         data = g_new0(PrivacyDataPGP, 1);
  55         data->data.system = &pgpmime_system;
  56         data->done_sigtest = FALSE;
  57         data->is_signed = FALSE;
  58         data->sigstatus = GPGME_SIG_STAT_NONE;
  59         gpgme_new(&data->ctx);
  60
  61         return data;
  62 }
  63
  64 static void pgpmime_free_privacydata(PrivacyData *_data)
  65 {
  66         PrivacyDataPGP *data = (PrivacyDataPGP *) _data;
  67
  68         g_free(data);
  69 }
  70
  71 static gboolean pgpmime_is_signed(MimeInfo *mimeinfo)
  72 {
  73         MimeInfo *parent;
  74         MimeInfo *signature;
  75         gchar *protocol;
  76         PrivacyDataPGP *data = NULL;
  77
  78         g_return_val_if_fail(mimeinfo != NULL, FALSE);
  79         if (mimeinfo->privacy != NULL) {
  80                 data = (PrivacyDataPGP *) mimeinfo->privacy;
  81                 if (data->done_sigtest)
  82                         return data->is_signed;
  83         }
  84
  85         /* check parent */
  86         parent = procmime_mimeinfo_parent(mimeinfo);
  87         if (parent == NULL)
  88                 return FALSE;
  89         if ((parent->type != MIMETYPE_MULTIPART) ||
  90             g_strcasecmp(parent->subtype, "signed"))
  91                 return FALSE;
  92         protocol = g_hash_table_lookup(parent->parameters, "protocol");
  93         if ((protocol == NULL) || g_strcasecmp(protocol, "application/pgp-signature"))
  94                 return FALSE;
  95
  96         /* check if mimeinfo is the first child */
  97         if (parent->node->children->data != mimeinfo)
  98                 return FALSE;
  99
 100         /* check signature */
 101         signature = parent->node->children->next != NULL ?
 102             (MimeInfo *) parent->node->children->next->data : NULL;
 103         if (signature == NULL)
 104                 return FALSE;
 105         if ((signature->type != MIMETYPE_APPLICATION) ||
 106             g_strcasecmp(signature->subtype, "pgp-signature"))
 107                 return FALSE;
 108
 109         if (data == NULL) {
 110                 data = pgpmime_new_privacydata();
 111                 mimeinfo->privacy = (PrivacyData *) data;
 112         }
 113         data->done_sigtest = TRUE;
 114         data->is_signed = TRUE;
 115
 116         return TRUE;
 117 }
 118
 119 static gint pgpmime_check_signature(MimeInfo *mimeinfo)
 120 {
 121         PrivacyDataPGP *data;
 122         MimeInfo *parent, *signature;
 123         FILE *fp;
 124         gchar buf[BUFFSIZE];
 125         gchar *boundary;
 126         GString *textstr;
 127         gint boundary_len;
 128         GpgmeData sigdata, textdata;
 129
 130         g_return_val_if_fail(mimeinfo != NULL, -1);
 131         g_return_val_if_fail(mimeinfo->privacy != NULL, -1);
 132         data = (PrivacyDataPGP *) mimeinfo->privacy;
 133
 134         debug_print("Checking PGP/MIME signature\n");
 135         parent = procmime_mimeinfo_parent(mimeinfo);
 136
 137         fp = fopen(parent->filename, "rb");
 138         g_return_val_if_fail(fp != NULL, SIGNATURE_INVALID);
 139
 140         boundary = g_hash_table_lookup(parent->parameters, "boundary");
 141         boundary_len = strlen(boundary);
 142         while (fgets(buf, sizeof(buf), fp) != NULL)
 143                 if (IS_BOUNDARY(buf, boundary, boundary_len))
 144                         break;
 145
 146         textstr = g_string_new("");
 147         while (fgets(buf, sizeof(buf), fp) != NULL) {
 148                 gchar *buf2;
 149
 150                 if (IS_BOUNDARY(buf, boundary, boundary_len))
 151                         break;
 152
 153                 buf2 = canonicalize_str(buf);
 154                 g_string_append(textstr, buf2);
 155                 g_free(buf2);
 156         }
 157         g_string_truncate(textstr, textstr->len - 2);
 158
 159
 160         gpgme_data_new_from_mem(&textdata, textstr->str, textstr->len, 0);
 161         signature = (MimeInfo *) mimeinfo->node->next->data;
 162         gpgme_data_new_from_filepart(&sigdata,
 163                 signature->filename,
 164                 NULL,
 165                 signature->offset,
 166                 signature->length);
 167
 168         data->sigstatus =
 169                 sgpgme_verify_signature (data->ctx, sigdata, textdata);
 170
 171         gpgme_data_release(sigdata);
 172         gpgme_data_release(textdata);
 173         g_string_free(textstr, TRUE);
 174
 175         printf("result: %d\n", data->sigstatus);
 176
 177         return 0;
 178 }
 179
 180 static SignatureStatus pgpmime_get_sig_status(MimeInfo *mimeinfo)
 181 {
 182         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 183
 184         g_return_val_if_fail(data != NULL, SIGNATURE_INVALID);
 185
 186         return sgpgme_sigstat_gpgme_to_privacy(data->sigstatus);
 187 }
 188
 189 static gchar *pgpmime_get_sig_info_short(MimeInfo *mimeinfo)
 190 {
 191         PrivacyDataPGP *data = (PrivacyDataPGP *) mimeinfo->privacy;
 192
 193         g_return_val_if_fail(data != NULL, g_strdup("Error"));
 194
 195         return sgpgme_sigstat_info_short(data->ctx, data->sigstatus);
 196 }
 197
 198 static PrivacySystem pgpmime_system = {
 199         "PGP/Mime",                     /* name */
 200
 201         pgpmime_free_privacydata,       /* free_privacydata */
 202
 203         pgpmime_is_signed,              /* is_signed(MimeInfo *) */
 204         pgpmime_check_signature,        /* check_signature(MimeInfo *) */
 205         pgpmime_get_sig_status,         /* get_sig_status(MimeInfo *) */
 206         pgpmime_get_sig_info_short,     /* get_sig_info_short(MimeInfo *) */
 207         NULL,                           /* get_sig_info_full(MimeInfo *) */
 208
 209         /* NOT YET */
 210         NULL,                           /* is_encrypted(MimeInfo *) */
 211         NULL,                           /* decrypt(MimeInfo *) */
 212 };
 213
 214 void pgpmime_init()
 215 {
 216         privacy_register_system(&pgpmime_system);
 217 }
 218
 219 void pgpmime_done()
 220 {
 221         privacy_unregister_system(&pgpmime_system);
 222 }
 223
 224 #endif /* USE_GPGME */