feat: support host level dynamic setting of tls protocol version

apisix/cli/ngx_tpl.lua

@@ -653,6 +653,10 @@ http {
         }
 
         {% if ssl.enable then %}
+        ssl_client_hello_by_lua_block {
+            apisix.http_ssl_protocols_phase()
+        }
+
         ssl_certificate_by_lua_block {
             apisix.http_ssl_phase()
         }

apisix/init.lua

@@ -178,11 +178,30 @@ end
 
 
 function _M.http_ssl_phase()
+    local ok, err = router.router_ssl.set(ngx.ctx.matched_ssl)
+    if not ok then
+        if err then
+            core.log.error("failed to fetch ssl config: ", err)
+        end
+        ngx_exit(-1)
+    end
+end
+
+function _M.http_ssl_protocols_phase()
+    local sni, err = apisix_ssl.server_name(true)
+    if not sni or type(sni) ~= "string" then
+        local advise = "please check if the client requests via IP or uses an outdated " ..
+        "protocol. If you need to report an issue, " ..
+        "provide a packet capture file of the TLS handshake."
+        core.log.error("failed to find SNI: " .. (err or advise))
+        ngx_exit(-1)
+    end
+
     local ngx_ctx = ngx.ctx
     local api_ctx = core.tablepool.fetch("api_ctx", 0, 32)
     ngx_ctx.api_ctx = api_ctx
 
-    local ok, err = router.router_ssl.match_and_set(api_ctx)
+    local ok, err = router.router_ssl.match_and_set(api_ctx, true, sni)
 
     ngx_ctx.matched_ssl = api_ctx.matched_ssl
     core.tablepool.release("api_ctx", api_ctx)
@@ -192,10 +211,16 @@ function _M.http_ssl_phase()
         if err then
             core.log.error("failed to fetch ssl config: ", err)
         end
+        core.log.error("failed to match any SSL certificate by SNI: ", sni)
         ngx_exit(-1)
     end
-end
 
+    ok, err = apisix_ssl.set_protocols_by_clienthello(ngx_ctx.matched_ssl.value.ssl_protocols)
+    if not ok then
+        core.log.error("failed to set ssl protocols: ", err)
+        ngx_exit(-1)
+    end
+end
 
 local function stash_ngx_ctx()
     local ref = ctxdump.stash_ngx_ctx()

apisix/schema_def.lua

@@ -790,6 +790,15 @@ _M.ssl = {
             enum = {1, 0},
             default = 1
         },
+        ssl_protocols = {
+            description = "set ssl protocols",
+            type = "array",
+            maxItems = 3,
+            uniqueItems = true,
+            items = {
+                enum = {"TLSv1.1","TLSv1.2", "TLSv1.3"}
+            },
+        },
         validity_end = timestamp_def,
         validity_start = timestamp_def,
         create_time = timestamp_def,

apisix/ssl.lua

@@ -14,9 +14,11 @@
 -- See the License for the specific language governing permissions and
 -- limitations under the License.
 --
-local core = require("apisix.core")
-local ngx_ssl = require("ngx.ssl")
-local secret = require("apisix.secret")
+local core           = require("apisix.core")
+local secret         = require("apisix.secret")
+local ngx_ssl        = require("ngx.ssl")
+local ngx_ssl_client = require("ngx.ssl.clienthello")
+
 local ngx_encode_base64 = ngx.encode_base64
 local ngx_decode_base64 = ngx.decode_base64
 local aes = require("resty.aes")
@@ -38,8 +40,13 @@ local pkey_cache = core.lrucache.new {
 local _M = {}
 
 
-function _M.server_name()
-    local sni, err = ngx_ssl.server_name()
+function _M.server_name(clienthello)
+    local sni, err
+    if clienthello then
+        sni, err = ngx_ssl_client.get_client_hello_server_name()
+    else
+        sni, err = ngx_ssl.server_name()
+    end
     if err then
         return nil, err
     end
@@ -57,6 +64,14 @@ function _M.server_name()
 end
 
 
+function _M.set_protocols_by_clienthello(ssl_protocols)
+    if ssl_protocols then
+       return ngx_ssl_client.set_protocols(ssl_protocols)
+    end
+    return true
+end
+
+
 local function init_iv_tbl(ivs)
     local _aes_128_cbc_with_iv_tbl = core.table.new(2, 0)
     local type_ivs = type(ivs)

apisix/ssl/router/radixtree_sni.lua

@@ -206,13 +206,35 @@ function _M.match_and_set(api_ctx, match_only, alt_sni)
         end
     end
 
-    local matched_ssl = api_ctx.matched_ssl
-    core.log.info("debug - matched: ", core.json.delay_encode(matched_ssl, true))
+    core.log.info("debug - matched: ", core.json.delay_encode(api_ctx.matched_ssl, true))
 
     if match_only then
         return true
     end
 
+    ok, err = _M.set(api_ctx.matched_ssl, sni)
+    if not ok then
+        return false, err
+    end
+
+    return true
+end
+
+
+function _M.set(matched_ssl, sni)
+    if not matched_ssl then
+        return false, "failed to match ssl certificate"
+    end
+    local ok, err
+    if not sni then
+        sni, err = apisix_ssl.server_name()
+        if type(sni) ~= "string" then
+            local advise = "please check if the client requests via IP or uses an outdated " ..
+                           "protocol. If you need to report an issue, " ..
+                           "provide a packet capture file of the TLS handshake."
+            return false, "failed to find SNI: " .. (err or advise)
+        end
+    end
     ngx_ssl.clear_certs()
 
     local new_ssl_value = secret.fetch_secrets(matched_ssl.value) or matched_ssl.value

ci/common.sh

@@ -21,6 +21,7 @@ export_or_prefix() {
     export OPENRESTY_PREFIX="/usr/local/openresty-debug"
     export APISIX_MAIN="https://raw.githubusercontent.com/apache/incubator-apisix/master/rockspec/apisix-master-0.rockspec"
     export PATH=$OPENRESTY_PREFIX/nginx/sbin:$OPENRESTY_PREFIX/luajit/bin:$OPENRESTY_PREFIX/bin:$PATH
+    export OPENSSL111_BIN=$OPENRESTY_PREFIX/openssl111/bin/openssl
 }
 
 create_lua_deps() {

ci/linux-install-openresty.sh

@@ -38,6 +38,13 @@ OPENSSL3_PREFIX=${OPENSSL3_PREFIX-/home/runner}
 SSL_LIB_VERSION=${SSL_LIB_VERSION-openssl}
 
 if [ "$OPENRESTY_VERSION" == "source" ]; then
+    export openssl_prefix=$OPENRESTY_PREFIX/openssl111
+    export zlib_prefix=$OPENRESTY_PREFIX/zlib
+    export pcre_prefix=$OPENRESTY_PREFIX/pcre
+
+    export cc_opt="-DNGX_LUA_ABORT_AT_PANIC -I${zlib_prefix}/include -I${pcre_prefix}/include -I${openssl_prefix}/include"
+    export ld_opt="-L${zlib_prefix}/lib -L${pcre_prefix}/lib -L${openssl_prefix}/lib -Wl,-rpath,${zlib_prefix}/lib:${pcre_prefix}/lib:${openssl_prefix}/lib"
+
     if [ "$COMPILE_OPENSSL3" == "yes" ]; then
         apt install -y build-essential
         git clone https://github.com/openssl/openssl

docs/en/latest/admin-api.md

@@ -1194,6 +1194,7 @@ SSL resource request address: /apisix/admin/ssls/{id}
 | update_time  | False    | Auxiliary                | Epoch timestamp (in seconds) of the updated time. If missing, this field will be populated automatically.         | 1602883670                                       |
 | type         | False    | Auxiliary            | Identifies the type of certificate, default  `server`.                                                                             | `client` Indicates that the certificate is a client certificate, which is used when APISIX accesses the upstream; `server` Indicates that the certificate is a server-side certificate, which is used by APISIX when verifying client requests.     |
 | status       | False    | Auxiliary                | Enables the current SSL. Set to `1` (enabled) by default.                                                      | `1` to enable, `0` to disable                    |
+| ssl_protocols | False    | An array of ssl protocols               | It is used to control the SSL/TLS protocol version used between servers and clients. See [SSL Protocol](./ssl-protocol.md) for more examples.                  |                `["TLSv1.2", "TLSv2.3"]`                                  |
 
 Example Configuration:
 

docs/en/latest/config.json

@@ -366,6 +366,10 @@
         {
           "type": "doc",
           "id": "profile"
+        },
+        {
+          "type": "doc",
+          "id": "ssl-protocol"
         }
       ]
     },