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 #include <errno.h>
  36 #endif /* HAVE_NSS */
  37
  38 #include <glib/gi18n-lib.h>
  39
  40 #include "camel.h"
  41 #include "camel-certdb.h"
  42 #include "camel-debug.h"
  43 #include "camel-provider.h"
  44 #include "camel-win32.h"
  45
  46 #ifdef HAVE_NSS
  47 /* To protect NSS initialization and shutdown. This prevents
  48    concurrent calls to shutdown() and init() by different threads */
  49 PRLock *nss_initlock = NULL;
  50
  51 /* Whether or not Camel has initialized the NSS library. We cannot
  52    unconditionally call NSS_Shutdown() if NSS was initialized by other
  53    library before. This boolean ensures that we only perform a cleanup
  54    if and only if Camel is the one that previously initialized NSS */
  55 volatile gboolean nss_initialized = FALSE;
  56 #endif
  57
  58 static gint initialised = FALSE;
  59
  60 gint camel_application_is_exiting = FALSE;
  61
  62 #define NSS_SYSTEM_DB "/etc/pki/nssdb"
  63
  64 static gint
  65 nss_has_system_db(void)
  66 {
  67         int found = FALSE;
  68 #ifndef G_OS_WIN32
  69         FILE *f;
  70         char buf[80];
  71
  72         f = fopen(NSS_SYSTEM_DB "/pkcs11.txt", "r");
  73         if (!f)
  74                 return FALSE;
  75
  76         /* Check whether the system NSS db is actually enabled */
  77         while (fgets(buf, 80, f) && !found) {
  78                 if (!strcmp(buf, "library=libnsssysinit.so\n"))
  79                         found = TRUE;
  80         }
  81         fclose(f);
  82 #endif
  83         return found;
  84 }
  85
  86 gint
  87 camel_init (const gchar *configdir, gboolean nss_init)
  88 {
  89         CamelCertDB *certdb;
  90         gchar *path;
  91
  92         if (initialised)
  93                 return 0;
  94
  95         bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
  96         bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
  97
  98         camel_debug_init();
  99
 100 #ifdef HAVE_NSS
 101         if (nss_init) {
 102                 gchar *nss_configdir = NULL;
 103                 gchar *nss_sql_configdir = NULL;
 104                 SECStatus status = SECFailure;
 105                 PRUint16 indx;
 106
 107                 if (nss_initlock == NULL) {
 108                         PR_Init(PR_SYSTEM_THREAD, PR_PRIORITY_NORMAL, 10);
 109                         nss_initlock = PR_NewLock();
 110                 }
 111                 PR_Lock (nss_initlock);
 112
 113                 if (NSS_IsInitialized ())
 114                         goto skip_nss_init;
 115
 116 #ifndef G_OS_WIN32
 117                 nss_configdir = g_strdup (configdir);
 118 #else
 119                 nss_configdir = g_win32_locale_filename_from_utf8 (configdir);
 120 #endif
 121
 122                 if (nss_has_system_db ()) {
 123                         nss_sql_configdir = g_strdup ("sql:" NSS_SYSTEM_DB );
 124                 } else {
 125                         /* On Windows, we use the Evolution configdir. On other
 126                          * operating systems we use ~/.pki/nssdb/, which is where
 127                          * the user-specific part of the "shared system db" is
 128                          * stored and is what Chrome uses too.
 129                          *
 130                          * We have to create the configdir if it does not exist,
 131                          * to prevent camel from bailing out on first run. */
 132 #ifdef G_OS_WIN32
 133                         g_mkdir_with_parents (configdir, 0700);
 134                         nss_sql_configdir = g_strconcat ("sql:", nss_configdir, NULL);
 135 #else
 136                         gchar *user_nss_dir = g_build_filename ( g_get_home_dir (),
 137                                                                  ".pki/nssdb", NULL );
 138                         if (g_mkdir_with_parents (user_nss_dir, 0700))
 139                                 g_warning("Failed to create SQL database directory %s: %s\n",
 140                                           user_nss_dir, strerror(errno));
 141
 142                         nss_sql_configdir = g_strconcat ("sql:", user_nss_dir, NULL);
 143                         g_free(user_nss_dir);
 144 #endif
 145                 }
 146
 147
 148 #if NSS_VMAJOR > 3 || (NSS_VMAJOR == 3 && NSS_VMINOR >= 12)
 149                 /* See: https://wiki.mozilla.org/NSS_Shared_DB,
 150                  * particularly "Mode 3A".  Note that the target
 151                  * directory MUST EXIST. */
 152                 status = NSS_InitWithMerge (
 153                         nss_sql_configdir,      /* dest dir */
 154                         "", "",                 /* new DB name prefixes */
 155                         SECMOD_DB,              /* secmod name */
 156                         nss_configdir,          /* old DB dir */
 157                         "", "",                 /* old DB name prefixes */
 158                         nss_configdir,          /* unique ID for old DB */
 159                         "Evolution S/MIME",     /* UI name for old DB */
 160                         0);                     /* flags */
 161
 162                 if (status == SECFailure) {
 163                         g_warning ("Failed to initialize NSS SQL database in %s: NSS error %d",
 164                                    nss_sql_configdir, PORT_GetError());
 165                         /* Fall back to opening the old DBM database */
 166                 }
 167 #endif
 168                 /* Support old versions of libnss, pre-sqlite support. */
 169                 if (status == SECFailure)
 170                         status = NSS_InitReadWrite (nss_configdir);
 171                 if (status == SECFailure) {
 172                         /* Fall back to using volatile dbs? */
 173                         status = NSS_NoDB_Init (nss_configdir);
 174                         if (status == SECFailure) {
 175                                 g_free (nss_configdir);
 176                                 g_free (nss_sql_configdir);
 177                                 g_warning ("Failed to initialize NSS");
 178                                 PR_Unlock (nss_initlock);
 179                                 return -1;
 180                         }
 181                 }
 182
 183                 nss_initialized = TRUE;
 184 skip_nss_init:
 185
 186                 NSS_SetDomesticPolicy ();
 187
 188                 PR_Unlock(nss_initlock);
 189
 190                 /* we must enable all ciphersuites */
 191                 for (indx = 0; indx < SSL_NumImplementedCiphers; indx++) {
 192                         if (!SSL_IS_SSL2_CIPHER(SSL_ImplementedCiphers[indx]))
 193                                 SSL_CipherPrefSetDefault (SSL_ImplementedCiphers[indx], PR_TRUE);
 194                 }
 195
 196                 SSL_OptionSetDefault (SSL_ENABLE_SSL2, PR_TRUE);
 197                 SSL_OptionSetDefault (SSL_ENABLE_SSL3, PR_TRUE);
 198                 SSL_OptionSetDefault (SSL_ENABLE_TLS, PR_TRUE);
 199                 SSL_OptionSetDefault (SSL_V2_COMPATIBLE_HELLO, PR_TRUE /* maybe? */);
 200
 201                 g_free (nss_configdir);
 202                 g_free (nss_sql_configdir);
 203         }
 204 #endif /* HAVE_NSS */
 205
 206         path = g_strdup_printf ("%s/camel-cert.db", configdir);
 207         certdb = camel_certdb_new ();
 208         camel_certdb_set_filename (certdb, path);
 209         g_free (path);
 210
 211         /* if we fail to load, who cares? it'll just be a volatile certdb */
 212         camel_certdb_load (certdb);
 213
 214         /* set this certdb as the default db */
 215         camel_certdb_set_default (certdb);
 216
 217         g_object_unref (certdb);
 218
 219         initialised = TRUE;
 220
 221         return 0;
 222 }
 223
 224 /**
 225  * camel_shutdown:
 226  *
 227  * Since: 2.24
 228  **/
 229 void
 230 camel_shutdown (void)
 231 {
 232         CamelCertDB *certdb;
 233
 234         if (!initialised)
 235                 return;
 236
 237         certdb = camel_certdb_get_default ();
 238         if (certdb) {
 239                 camel_certdb_save (certdb);
 240                 camel_certdb_set_default (NULL);
 241         }
 242
 243         /* These next calls must come last. */
 244
 245 #if defined (HAVE_NSS)
 246         if (nss_initlock != NULL) {
 247                 PR_Lock(nss_initlock);
 248                 if (nss_initialized)
 249                         NSS_Shutdown ();
 250                 PR_Unlock(nss_initlock);
 251         }
 252 #endif /* HAVE_NSS */
 253
 254         initialised = FALSE;
 255 }