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 #define NSS_SYSTEM_DB "/etc/pki/nssdb"
  62
  63 static gint
  64 nss_has_system_db(void)
  65 {
  66         int found = FALSE;
  67 #ifndef G_OS_WIN32
  68         FILE *f;
  69         char buf[80];
  70
  71         f = fopen(NSS_SYSTEM_DB "/pkcs11.txt", "r");
  72         if (!f)
  73                 return FALSE;
  74
  75         /* Check whether the system NSS db is actually enabled */
  76         while (fgets(buf, 80, f) && !found) {
  77                 if (!strcmp(buf, "library=libnsssysinit.so\n"))
  78                         found = TRUE;
  79         }
  80         fclose(f);
  81 #endif
  82         return found;
  83 }
  84
  85 gint
  86 camel_init (const gchar *configdir, gboolean nss_init)
  87 {
  88         CamelCertDB *certdb;
  89         gchar *path;
  90
  91         if (initialised)
  92                 return 0;
  93
  94         bindtextdomain (GETTEXT_PACKAGE, EVOLUTION_LOCALEDIR);
  95         bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
  96
  97         camel_debug_init();
  98
  99 #ifdef HAVE_NSS
 100         if (nss_init) {
 101                 gchar *nss_configdir = NULL;
 102                 gchar *nss_sql_configdir = NULL;
 103                 SECStatus status;
 104                 PRUint16 indx;
 105
 106                 if (nss_initlock == NULL) {
 107                         PR_Init(PR_SYSTEM_THREAD, PR_PRIORITY_NORMAL, 10);
 108                         nss_initlock = PR_NewLock();
 109                 }
 110                 PR_Lock (nss_initlock);
 111
 112                 if (NSS_IsInitialized ())
 113                         goto skip_nss_init;
 114
 115 #ifndef G_OS_WIN32
 116                 nss_configdir = g_strdup (configdir);
 117 #else
 118                 nss_configdir = g_win32_locale_filename_from_utf8 (configdir);
 119 #endif
 120
 121                 if (nss_has_system_db ()) {
 122                         nss_sql_configdir = g_strdup ("sql:" NSS_SYSTEM_DB );
 123                 } else {
 124                         /* On Windows, we use the Evolution configdir. On other
 125                          * operating systems we use ~/.pki/nssdb/, which is where
 126                          * the user-specific part of the "shared system db" is
 127                          * stored and is what Chrome uses too.
 128                          *
 129                          * We have to create the configdir if it does not exist,
 130                          * to prevent camel from bailing out on first run. */
 131 #ifdef G_OS_WIN32
 132                         g_mkdir_with_parents (configdir, 0700);
 133                         nss_sql_configdir = g_strconcat ("sql:", nss_configdir, NULL);
 134 #else
 135                         gchar *user_nss_dir = g_build_filename ( g_get_home_dir (),
 136                                                                  ".pki/nssdb", NULL );
 137                         g_mkdir_with_parents (user_nss_dir, 0700);
 138
 139                         nss_sql_configdir = g_strconcat ("sql:", user_nss_dir, NULL);
 140                         g_free(user_nss_dir);
 141 #endif
 142                 }
 143
 144
 145 #if NSS_VMAJOR > 3 || (NSS_VMAJOR == 3 && NSS_VMINOR >= 12)
 146                 /* See: https://wiki.mozilla.org/NSS_Shared_DB,
 147                  * particularly "Mode 3A".  Note that the target
 148                  * directory MUST EXIST. */
 149                 status = NSS_InitWithMerge (
 150                         nss_sql_configdir,      /* dest dir */
 151                         "", "",                 /* new DB name prefixes */
 152                         SECMOD_DB,              /* secmod name */
 153                         nss_configdir,          /* old DB dir */
 154                         "", "",                 /* old DB name prefixes */
 155                         nss_configdir,          /* unique ID for old DB */
 156                         "Evolution S/MIME",     /* UI name for old DB */
 157                         0);                     /* flags */
 158
 159                 if (status == SECFailure) {
 160                         g_free (nss_configdir);
 161                         g_free (nss_sql_configdir);
 162                         g_warning ("Failed to initialize NSS");
 163                         PR_Unlock (nss_initlock);
 164                         return -1;
 165                 }
 166 #else
 167                 /* Support old versions of libnss, pre-sqlite support. */
 168                 status = NSS_InitReadWrite (nss_configdir);
 169                 if (status == SECFailure) {
 170                         /* Fall back to using volatile dbs? */
 171                         status = NSS_NoDB_Init (nss_configdir);
 172                         if (status == SECFailure) {
 173                                 g_free (nss_configdir);
 174                                 g_free (nss_sql_configdir);
 175                                 g_warning ("Failed to initialize NSS");
 176                                 PR_Unlock (nss_initlock);
 177                                 return -1;
 178                         }
 179                 }
 180 #endif
 181
 182                 nss_initialized = TRUE;
 183 skip_nss_init:
 184
 185                 NSS_SetDomesticPolicy ();
 186
 187                 PR_Unlock(nss_initlock);
 188
 189                 /* we must enable all ciphersuites */
 190                 for (indx = 0; indx < SSL_NumImplementedCiphers; indx++) {
 191                         if (!SSL_IS_SSL2_CIPHER(SSL_ImplementedCiphers[indx]))
 192                                 SSL_CipherPrefSetDefault (SSL_ImplementedCiphers[indx], PR_TRUE);
 193                 }
 194
 195                 SSL_OptionSetDefault (SSL_ENABLE_SSL2, PR_TRUE);
 196                 SSL_OptionSetDefault (SSL_ENABLE_SSL3, PR_TRUE);
 197                 SSL_OptionSetDefault (SSL_ENABLE_TLS, PR_TRUE);
 198                 SSL_OptionSetDefault (SSL_V2_COMPATIBLE_HELLO, PR_TRUE /* maybe? */);
 199
 200                 g_free (nss_configdir);
 201                 g_free (nss_sql_configdir);
 202         }
 203 #endif /* HAVE_NSS */
 204
 205         path = g_strdup_printf ("%s/camel-cert.db", configdir);
 206         certdb = camel_certdb_new ();
 207         camel_certdb_set_filename (certdb, path);
 208         g_free (path);
 209
 210         /* if we fail to load, who cares? it'll just be a volatile certdb */
 211         camel_certdb_load (certdb);
 212
 213         /* set this certdb as the default db */
 214         camel_certdb_set_default (certdb);
 215
 216         g_object_unref (certdb);
 217
 218         initialised = TRUE;
 219
 220         return 0;
 221 }
 222
 223 /**
 224  * camel_shutdown:
 225  *
 226  * Since: 2.24
 227  **/
 228 void
 229 camel_shutdown (void)
 230 {
 231         CamelCertDB *certdb;
 232
 233         if (!initialised)
 234                 return;
 235
 236         certdb = camel_certdb_get_default ();
 237         if (certdb) {
 238                 camel_certdb_save (certdb);
 239                 camel_certdb_set_default (NULL);
 240         }
 241
 242         /* These next calls must come last. */
 243
 244 #if defined (HAVE_NSS)
 245         if (nss_initlock != NULL) {
 246                 PR_Lock(nss_initlock);
 247                 if (nss_initialized)
 248                         NSS_Shutdown ();
 249                 PR_Unlock(nss_initlock);
 250         }
 251 #endif /* HAVE_NSS */
 252
 253         initialised = FALSE;
 254 }