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libs/corosio/src/corosio/src/tls/detail/context_impl.hpp
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1 //
2 // Copyright (c) 2025 Vinnie Falco (vinnie dot falco at gmail dot com)
3 //
4 // Distributed under the Boost Software License, Version 1.0. (See accompanying
5 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6 //
7 // Official repository: https://github.com/cppalliance/corosio
8 //
9
10 #ifndef SRC_TLS_DETAIL_CONTEXT_IMPL_HPP
11 #define SRC_TLS_DETAIL_CONTEXT_IMPL_HPP
12
13 #include <boost/corosio/tls_context.hpp>
14
15 #include <functional>
16 #include <mutex>
17 #include <string>
18 #include <vector>
19
20 namespace boost::corosio {
21
22 namespace detail {
23
24 /** Abstract base for cached native SSL contexts.
25
26 Stored in context::impl as an intrusive linked list.
27 Each TLS backend derives from this to cache its native
28 context handle ( WOLFSSL_CTX*, SSL_CTX*, etc. ).
29 */
30 class native_context_base
31 {
32 public:
33 native_context_base* next_ = nullptr;
34 void const* service_ = nullptr;
35
36 virtual ~native_context_base() = default;
37 };
38
39 struct tls_context_data
40 {
41 //--------------------------------------------
42 // Credentials
43
44 std::string entity_certificate;
45 tls_file_format entity_cert_format = tls_file_format::pem;
46 std::string certificate_chain;
47 std::string private_key;
48 tls_file_format private_key_format = tls_file_format::pem;
49
50 //--------------------------------------------
51 // Trust anchors
52
53 std::vector<std::string> ca_certificates;
54 std::vector<std::string> verify_paths;
55 bool use_default_verify_paths = false;
56
57 //--------------------------------------------
58 // Protocol settings
59
60 tls_version min_version = tls_version::tls_1_2;
61 tls_version max_version = tls_version::tls_1_3;
62 std::string ciphersuites;
63 std::vector<std::string> alpn_protocols;
64
65 //--------------------------------------------
66 // Verification
67
68 tls_verify_mode verification_mode = tls_verify_mode::none;
69 int verify_depth = 100;
70 std::string hostname;
71 std::function<bool( bool, void* )> verify_callback;
72
73 //--------------------------------------------
74 // SNI (Server Name Indication)
75
76 std::function<bool( std::string_view )> servername_callback;
77
78 //--------------------------------------------
79 // Revocation
80
81 std::vector<std::string> crls;
82 std::string ocsp_staple;
83 bool require_ocsp_staple = false;
84 tls_revocation_policy revocation = tls_revocation_policy::disabled;
85
86 //--------------------------------------------
87 // Password
88
89 std::function<std::string( std::size_t, tls_password_purpose )> password_callback;
90
91 //--------------------------------------------
92 // Cached native contexts (intrusive list)
93
94 mutable std::mutex native_contexts_mutex_;
95 mutable native_context_base* native_contexts_ = nullptr;
96
97 /** Find or insert a cached native context.
98
99 @param service The unique key for the backend.
100 @param create Factory function called if not found.
101
102 @return Pointer to the cached native context.
103 */
104 template<typename Factory>
105 native_context_base*
106 find( void const* service, Factory&& create ) const
107 {
108 std::lock_guard<std::mutex> lock( native_contexts_mutex_ );
109
110 for( auto* p = native_contexts_; p; p = p->next_ )
111 if( p->service_ == service )
112 return p;
113
114 // Not found - create and prepend
115 auto* ctx = create();
116 ctx->service_ = service;
117 ctx->next_ = native_contexts_;
118 native_contexts_ = ctx;
119 return ctx;
120 }
121
122 ✗ ~tls_context_data()
123 {
124 // Clean up cached native contexts (no lock needed - destructor)
125 ✗ while( native_contexts_ )
126 {
127 ✗ auto* next = native_contexts_->next_;
128 ✗ delete native_contexts_;
129 ✗ native_contexts_ = next;
130 }
131 ✗ }
132 };
133
134 } // namespace detail
135
136 //------------------------------------------------------------------------------
137
138 /** Implementation of tls_context.
139
140 Contains all portable TLS configuration data plus
141 cached native SSL contexts as an intrusive list.
142 */
143 struct tls_context::impl : detail::tls_context_data
144 {
145 };
146
147 //------------------------------------------------------------------------------
148
149 namespace detail {
150
151 /** Return the TLS context data.
152
153 Provides read-only access to the portable configuration
154 stored in the context.
155
156 @param ctx The TLS context.
157
158 @return Reference to the context implementation.
159 */
160 inline tls_context_data const&
161 get_tls_context_data( tls_context const& ctx ) noexcept
162 {
163 return *ctx.impl_;
164 }
165
166 } // namespace detail
167
168 } // namespace boost::corosio
169
170 #endif
171