camel/camel.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
   2 /*
   3  *  Authors: Jeffrey Stedfast <fejj@ximian.com>
   4  *           Bertrand Guiheneuf <bertrand@helixcode.com>
   5  *
   6  *  Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU Lesser General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU Lesser General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU Lesser General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  *
  22  */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <signal.h>
  29
  30 #ifdef HAVE_NSS
  31 #include <nspr.h>
  32 #include <prthread.h>
  33 #include "nss.h"      /* Don't use <> here or it will include the system nss.h instead */
  34 #include <ssl.h>
  35 #endif /* HAVE_NSS */
  36
  37 #include <glib/gi18n-lib.h>
  38
  39 #include "camel.h"
  40 #include "camel-certdb.h"
  41 #include "camel-debug.h"
  42 #include "camel-provider.h"
  43 #include "camel-win32.h"
  44
  45 #ifdef HAVE_NSS
  46 /* To protect NSS initialization and shutdown. This prevents
  47    concurrent calls to shutdown() and init() by different threads */
  48 PRLock *nss_initlock = NULL;
  49
  50 /* Whether or not Camel has initialized the NSS library. We cannot
  51    unconditionally call NSS_Shutdown() if NSS was initialized by other
  52    library before. This boolean ensures that we only perform a cleanup
  53    if and only if Camel is the one that previously initialized NSS */
  54 volatile gboolean nss_initialized = FALSE;
  55 #endif
  56
  57 static gint initialised = FALSE;
  58
  59 gint camel_application_is_exiting = FALSE;
  60
  61 gint
  62 camel_init (const gchar *configdir, gboolean nss_init)
  63 {
  64         CamelCertDB *certdb;
  65         gchar *path;
  66
  67         if (initialised)
  68                 return 0;
  69
  70         bindtextdomain (GETTEXT_PACKAGE, EVOLUTION_LOCALEDIR);
  71         bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
  72
  73         camel_debug_init();
  74
  75 #ifdef HAVE_NSS
  76         if (nss_init) {
  77                 gchar *nss_configdir = NULL;
  78                 gchar *nss_sql_configdir = NULL;
  79                 SECStatus status;
  80                 PRUint16 indx;
  81
  82                 if (nss_initlock == NULL) {
  83                         PR_Init(PR_SYSTEM_THREAD, PR_PRIORITY_NORMAL, 10);
  84                         nss_initlock = PR_NewLock();
  85                 }
  86                 PR_Lock (nss_initlock);
  87
  88                 if (NSS_IsInitialized ())
  89                         goto skip_nss_init;
  90
  91 #ifndef G_OS_WIN32
  92                 nss_configdir = g_strdup (configdir);
  93 #else
  94                 nss_configdir = g_win32_locale_filename_from_utf8 (configdir);
  95 #endif
  96
  97                 /* Create the configdir if it does not exist
  98                  * This prevents camel from bailing out on first run */
  99                 g_mkdir_with_parents (configdir, 0700);
 100
 101                 /* XXX Currently we store the new shared NSS database in the
 102                  *     same location we kept the original NSS databases in,
 103                  *     but at least we have safe shared access between Camel
 104                  *     and Evolution's S/MIME.  Once freedesktop.org comes
 105                  *     up with a user-wide shared location, we should use
 106                  *     that instead. */
 107                 nss_sql_configdir = g_strconcat ("sql:", nss_configdir, NULL);
 108
 109 #if NSS_VMAJOR > 3 || (NSS_VMAJOR == 3 && NSS_VMINOR >= 12)
 110                 /* See: https://wiki.mozilla.org/NSS_Shared_DB,
 111                  * particularly "Mode 3A".  Note that the target
 112                  * directory MUST EXIST. */
 113                 status = NSS_InitWithMerge (
 114                         nss_sql_configdir,      /* dest dir */
 115                         "", "",                 /* new DB name prefixes */
 116                         SECMOD_DB,              /* secmod name */
 117                         nss_configdir,          /* old DB dir */
 118                         "", "",                 /* old DB name prefixes */
 119                         nss_configdir,          /* unique ID for old DB */
 120                         "Evolution S/MIME",     /* UI name for old DB */
 121                         0);                     /* flags */
 122
 123                 if (status == SECFailure) {
 124                         g_free (nss_configdir);
 125                         g_free (nss_sql_configdir);
 126                         g_warning ("Failed to initialize NSS");
 127                         PR_Unlock (nss_initlock);
 128                         return -1;
 129                 }
 130 #else
 131                 /* Support old versions of libnss, pre-sqlite support. */
 132                 status = NSS_InitReadWrite (nss_configdir);
 133                 if (status == SECFailure) {
 134                         /* Fall back to using volatile dbs? */
 135                         status = NSS_NoDB_Init (nss_configdir);
 136                         if (status == SECFailure) {
 137                                 g_free (nss_configdir);
 138                                 g_free (nss_sql_configdir);
 139                                 g_warning ("Failed to initialize NSS");
 140                                 PR_Unlock (nss_initlock);
 141                                 return -1;
 142                         }
 143                 }
 144 #endif
 145
 146                 nss_initialized = TRUE;
 147 skip_nss_init:
 148
 149                 NSS_SetDomesticPolicy ();
 150
 151                 PR_Unlock(nss_initlock);
 152
 153                 /* we must enable all ciphersuites */
 154                 for (indx = 0; indx < SSL_NumImplementedCiphers; indx++) {
 155                         if (!SSL_IS_SSL2_CIPHER(SSL_ImplementedCiphers[indx]))
 156                                 SSL_CipherPrefSetDefault (SSL_ImplementedCiphers[indx], PR_TRUE);
 157                 }
 158
 159                 SSL_OptionSetDefault (SSL_ENABLE_SSL2, PR_TRUE);
 160                 SSL_OptionSetDefault (SSL_ENABLE_SSL3, PR_TRUE);
 161                 SSL_OptionSetDefault (SSL_ENABLE_TLS, PR_TRUE);
 162                 SSL_OptionSetDefault (SSL_V2_COMPATIBLE_HELLO, PR_TRUE /* maybe? */);
 163
 164                 g_free (nss_configdir);
 165                 g_free (nss_sql_configdir);
 166         }
 167 #endif /* HAVE_NSS */
 168
 169         path = g_strdup_printf ("%s/camel-cert.db", configdir);
 170         certdb = camel_certdb_new ();
 171         camel_certdb_set_filename (certdb, path);
 172         g_free (path);
 173
 174         /* if we fail to load, who cares? it'll just be a volatile certdb */
 175         camel_certdb_load (certdb);
 176
 177         /* set this certdb as the default db */
 178         camel_certdb_set_default (certdb);
 179
 180         g_object_unref (certdb);
 181
 182         initialised = TRUE;
 183
 184         return 0;
 185 }
 186
 187 /**
 188  * camel_shutdown:
 189  *
 190  * Since: 2.24
 191  **/
 192 void
 193 camel_shutdown (void)
 194 {
 195         CamelCertDB *certdb;
 196
 197         if (!initialised)
 198                 return;
 199
 200         certdb = camel_certdb_get_default ();
 201         if (certdb) {
 202                 camel_certdb_save (certdb);
 203                 camel_certdb_set_default (NULL);
 204         }
 205
 206         /* These next calls must come last. */
 207
 208 #if defined (HAVE_NSS)
 209         if (nss_initlock != NULL) {
 210                 PR_Lock(nss_initlock);
 211                 if (nss_initialized)
 212                         NSS_Shutdown ();
 213                 PR_Unlock(nss_initlock);
 214         }
 215 #endif /* HAVE_NSS */
 216
 217         initialised = FALSE;
 218 }