rgw: allow to set ssl options and ciphers for beast frontend

Two new conf keys are added for "beast" framework:

- ssl_options: a colon separated list of ssl context options,
  documented in boost's ssl::context_base;

- ssl_ciphers: a colon separated list of ciphers, documented
  in openssl's ciphers(1) manual.

Example:

  rgw frontends = beast ...  ssl_options=default_workarounds:no_tlsv1:no_tlsv1_1 ssl_ciphers=HIGH:!aNULL:!MD5

Fixes: https://tracker.ceph.com/issues/50932
Signed-off-by: Mykola Golub <mgolub@suse.com>
(cherry picked from commit 91abede6357d167063c63eade45421d2f17bb0e7)

2 files changed, 80 insertions, 0 deletions

diff --git a/doc/radosgw/frontends.rst b/doc/radosgw/frontends.rst
index e4a01359085..389572255e8 100644
--- a/doc/radosgw/frontends.rst
+++ b/doc/radosgw/frontends.rst
@@ -64,6 +64,38 @@ Options
 :Type: String
 :Default: None
 
+``ssl_options``
+
+:Description: Optional colon separated list of ssl context options:
+
+              ``default_workarounds`` Implement various bug workarounds.
+
+              ``no_compression`` Disable compression.
+
+              ``no_sslv2`` Disable SSL v2.
+
+              ``no_sslv3`` Disable SSL v3.
+
+              ``no_tlsv1`` Disable TLS v1.
+
+              ``no_tlsv1_1`` Disable TLS v1.1.
+
+              ``no_tlsv1_2`` Disable TLS v1.2.
+
+              ``single_dh_use`` Always create a new key when using tmp_dh parameters.
+
+:Type: String
+:Default: None
+
+``ssl_ciphers``
+
+:Description: Optional list of one or more cipher strings separated by colons.
+              The format of the string is described in openssl's ciphers(1)
+              manual.
+
+:Type: String
+:Default: None
+
 ``tcp_nodelay``
 
 :Description: If set the socket option will disable Nagle's algorithm on 
diff --git a/src/rgw/rgw_asio_frontend.cc b/src/rgw/rgw_asio_frontend.cc
index 577f70f385d..7b2a65a63a1 100644
--- a/src/rgw/rgw_asio_frontend.cc
+++ b/src/rgw/rgw_asio_frontend.cc
@@ -22,6 +22,8 @@
 #include <boost/asio/ssl.hpp>
 #include <boost/beast/ssl/ssl_stream.hpp>
 
+#include "common/split.h"
+
 #include "services/svc_config_key.h"
 #include "services/svc_zone.h"
 
@@ -772,6 +774,52 @@ int AsioFrontend::init_ssl()
     return -EINVAL;
   }
 
+  std::optional<string> options = conf->get_val("ssl_options");
+  if (options) {
+    if (!cert) {
+      lderr(ctx()) << "no ssl_certificate configured for ssl_options" << dendl;
+      return -EINVAL;
+    }
+
+    for (auto &option : ceph::split(*options, ":")) {
+      if (option == "default_workarounds") {
+        ssl_context->set_options(ssl::context::default_workarounds);
+      } else if (option == "no_compression") {
+        ssl_context->set_options(ssl::context::no_compression);
+      } else if (option == "no_sslv2") {
+        ssl_context->set_options(ssl::context::no_sslv2);
+      } else if (option == "no_sslv3") {
+        ssl_context->set_options(ssl::context::no_sslv3);
+      } else if (option == "no_tlsv1") {
+        ssl_context->set_options(ssl::context::no_tlsv1);
+      } else if (option == "no_tlsv1_1") {
+        ssl_context->set_options(ssl::context::no_tlsv1_1);
+      } else if (option == "no_tlsv1_2") {
+        ssl_context->set_options(ssl::context::no_tlsv1_2);
+      } else if (option == "single_dh_use") {
+        ssl_context->set_options(ssl::context::single_dh_use);
+      } else {
+        lderr(ctx()) << "ignoring unknown ssl option '" << option << "'" << dendl;
+      }
+    }
+  }
+
+  std::optional<string> ciphers = conf->get_val("ssl_ciphers");
+  if (ciphers) {
+    if (!cert) {
+      lderr(ctx()) << "no ssl_certificate configured for ssl_ciphers" << dendl;
+      return -EINVAL;
+    }
+
+    int r = SSL_CTX_set_cipher_list(ssl_context->native_handle(),
+                                    ciphers->c_str());
+    if (r == 0) {
+      lderr(ctx()) << "no cipher could be selected from ssl_ciphers: "
+                   << *ciphers << dendl;
+      return -EINVAL;
+    }
+  }
+
   auto ports = config.equal_range("ssl_port");
   auto endpoints = config.equal_range("ssl_endpoint");