shrpx: add --ciphers option to specify allowed cipher list

examples/shrpx.cc

@@ -340,6 +340,8 @@ void fill_default_config()
 
   // Default accept() backlog
   mod_config()->backlog = 256;
+
+  mod_config()->ciphers = 0;
 }
 } // namespace
 
@@ -434,6 +436,8 @@ void print_help(std::ostream& out)
       << "    --backlog=<NUM>    Set listen backlog size.\n"
       << "                       Default: "
       << get_config()->backlog << "\n"
+      << "    --ciphers=<SUITE>  Set allowed cipher list. The format of the\n"
+      << "                       string is described in OpenSSL ciphers(1).\n"
       << "    -h, --help         Print this help.\n"
       << std::endl;
 }
@@ -471,6 +475,7 @@ int main(int argc, char **argv)
       {"syslog", no_argument, &flag, 13 },
       {"syslog-facility", required_argument, &flag, 14 },
       {"backlog", required_argument, &flag, 15 },
+      {"ciphers", required_argument, &flag, 16 },
       {"help", no_argument, 0, 'h' },
       {0, 0, 0, 0 }
     };
@@ -575,6 +580,10 @@ int main(int argc, char **argv)
         // --backlog
         cmdcfgs.push_back(std::make_pair(SHRPX_OPT_BACKLOG, optarg));
         break;
+      case 16:
+        // --ciphers
+        cmdcfgs.push_back(std::make_pair(SHRPX_OPT_CIPHERS, optarg));
+        break;
       default:
         break;
       }

examples/shrpx_config.cc

@@ -67,6 +67,7 @@ const char SHRPX_OPT_USER[] = "user";
 const char SHRPX_OPT_SYSLOG[] = "syslog";
 const char SHRPX_OPT_SYSLOG_FACILITY[] = "syslog-facility";
 const char SHRPX_OPT_BACKLOG[] = "backlog";
+const char SHRPX_OPT_CIPHERS[] = "ciphers";
 
 Config::Config()
   : verbose(false),
@@ -94,7 +95,8 @@ Config::Config()
     syslog(false),
     syslog_facility(0),
     use_syslog(false),
-    backlog(0)
+    backlog(0),
+    ciphers(0)
 {}
 
 namespace {
@@ -242,6 +244,8 @@ int parse_config(const char *opt, const char *optarg)
     mod_config()->syslog_facility = facility;
   } else if(util::strieq(opt, SHRPX_OPT_BACKLOG)) {
     mod_config()->backlog = strtol(optarg, 0, 10);
+  } else if(util::strieq(opt, SHRPX_OPT_CIPHERS)) {
+    set_config_str(&mod_config()->ciphers, optarg);
   } else if(util::strieq(opt, "conf")) {
     LOG(WARNING) << "conf is ignored";
   } else {

examples/shrpx_config.h

@@ -59,6 +59,7 @@ extern const char SHRPX_OPT_USER[];
 extern const char SHRPX_OPT_SYSLOG[];
 extern const char SHRPX_OPT_SYSLOG_FACILITY[];
 extern const char SHRPX_OPT_BACKLOG[];
+extern const char SHRPX_OPT_CIPHERS[];
 
 union sockaddr_union {
   sockaddr sa;
@@ -102,6 +103,7 @@ struct Config {
   // This member finally decides syslog is used or not
   bool use_syslog;
   int backlog;
+  char *ciphers;
   Config();
 };
 

examples/shrpx_ssl.cc

@@ -96,6 +96,13 @@ SSL_CTX* create_ssl_context()
   SSL_CTX_set_session_id_context(ssl_ctx, sid_ctx, sizeof(sid_ctx)-1);
   SSL_CTX_set_session_cache_mode(ssl_ctx, SSL_SESS_CACHE_SERVER);
 
+  if(get_config()->ciphers) {
+    if(SSL_CTX_set_cipher_list(ssl_ctx, get_config()->ciphers) == 0) {
+      LOG(FATAL) << "SSL_CTX_set_cipher_list failed.";
+      DIE();
+    }
+  }
+
   SSL_CTX_set_mode(ssl_ctx, SSL_MODE_ENABLE_PARTIAL_WRITE);
   SSL_CTX_set_mode(ssl_ctx, SSL_MODE_AUTO_RETRY);
   SSL_CTX_set_mode(ssl_ctx, SSL_MODE_RELEASE_BUFFERS);