diff options
Diffstat (limited to 'src/or/config.c')
| -rw-r--r-- | src/or/config.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/or/config.c b/src/or/config.c index f0686dae4c..ab991a4f6e 100644 --- a/src/or/config.c +++ b/src/or/config.c @@ -249,6 +249,7 @@ static config_var_t _option_vars[] = { V(DisableAllSwap, BOOL, "0"), V(DisableDebuggerAttachment, BOOL, "1"), V(DisableIOCP, BOOL, "1"), + V(DynamicDHGroups, BOOL, "1"), V(DNSPort, LINELIST, NULL), V(DNSListenAddress, LINELIST, NULL), V(DownloadExtraInfo, BOOL, "0"), @@ -1285,6 +1286,24 @@ get_effective_bwburst(const or_options_t *options) return (uint32_t)bw; } +/** Return True if any changes from <b>old_options</b> to + * <b>new_options</b> needs us to refresh our TLS context. */ +static int +options_transition_requires_fresh_tls_context(const or_options_t *old_options, + const or_options_t *new_options) +{ + tor_assert(new_options); + + if (!old_options) + return 0; + + if ((old_options->DynamicDHGroups != new_options->DynamicDHGroups)) { + return 1; + } + + return 0; +} + /** Fetch the active option list, and take actions based on it. All of the * things we do should survive being done repeatedly. If present, * <b>old_options</b> contains the previous value of the options. @@ -1388,6 +1407,29 @@ options_act(const or_options_t *old_options) finish_daemon(options->DataDirectory); } + /* If needed, generate a new TLS DH prime according to the current torrc. */ + if (server_mode(options)) { + if (!old_options) { + if (options->DynamicDHGroups) { + char *fname = get_datadir_fname2("keys", "dynamic_dh_params"); + crypto_set_tls_dh_prime(fname); + tor_free(fname); + } else { + crypto_set_tls_dh_prime(NULL); + } + } else { + if (options->DynamicDHGroups && !old_options->DynamicDHGroups) { + char *fname = get_datadir_fname2("keys", "dynamic_dh_params"); + crypto_set_tls_dh_prime(fname); + tor_free(fname); + } else if (!options->DynamicDHGroups && old_options->DynamicDHGroups) { + crypto_set_tls_dh_prime(NULL); + } + } + } else { /* clients don't need a dynamic DH prime. */ + crypto_set_tls_dh_prime(NULL); + } + /* We want to reinit keys as needed before we do much of anything else: keys are important, and other things can depend on them. */ if (transition_affects_workers || @@ -1397,6 +1439,13 @@ options_act(const or_options_t *old_options) log_warn(LD_BUG,"Error initializing keys; exiting"); return -1; } + } else if (old_options && + options_transition_requires_fresh_tls_context(old_options, + options)) { + if (router_initialize_tls_context() < 0) { + log_warn(LD_BUG,"Error initializing TLS context."); + return -1; + } } /* Write our PID to the PID file. If we do not have write permissions we |