1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/*
* TLS Session Management
* (C) 2011,2012 Jack Lloyd
*
* Released under the terms of the Botan license
*/
#include <botan/tls_session_manager.h>
#include <botan/libstate.h>
#include <botan/hex.h>
#include <chrono>
namespace Botan {
namespace TLS {
Session_Manager_In_Memory::Session_Manager_In_Memory(
size_t max_sessions, std::chrono::seconds session_lifetime) :
m_max_sessions(max_sessions),
m_session_lifetime(session_lifetime),
m_rng(global_state().global_rng()),
m_session_key(m_rng, 32)
{}
bool Session_Manager_In_Memory::load_from_session_str(
const std::string& session_str, Session& session)
{
// assert(lock is held)
auto i = m_sessions.find(session_str);
if(i == m_sessions.end())
return false;
try
{
session = Session::decrypt(i->second, m_session_key);
}
catch(...)
{
return false;
}
// if session has expired, remove it
const auto now = std::chrono::system_clock::now();
if(session.start_time() + session_lifetime() < now)
{
m_sessions.erase(i);
return false;
}
return true;
}
bool Session_Manager_In_Memory::load_from_session_id(
const std::vector<byte>& session_id, Session& session)
{
std::lock_guard<std::mutex> lock(m_mutex);
return load_from_session_str(hex_encode(session_id), session);
}
bool Session_Manager_In_Memory::load_from_host_info(
const std::string& hostname, u16bit port, Session& session)
{
std::lock_guard<std::mutex> lock(m_mutex);
auto i = m_host_sessions.find(hostname + ":" + std::to_string(port));
if(i == m_host_sessions.end())
{
if(port > 0)
i = m_host_sessions.find(hostname + ":" + std::to_string(0));
if(i == m_host_sessions.end())
return false;
}
if(load_from_session_str(i->second, session))
return true;
// was removed from sessions map, remove m_host_sessions entry
m_host_sessions.erase(i);
return false;
}
void Session_Manager_In_Memory::remove_entry(
const std::vector<byte>& session_id)
{
std::lock_guard<std::mutex> lock(m_mutex);
auto i = m_sessions.find(hex_encode(session_id));
if(i != m_sessions.end())
m_sessions.erase(i);
}
void Session_Manager_In_Memory::save(const Session& session, u16bit port)
{
std::lock_guard<std::mutex> lock(m_mutex);
if(m_max_sessions != 0)
{
/*
We generate new session IDs with the first 4 bytes being a
timestamp, so this actually removes the oldest sessions first.
*/
while(m_sessions.size() >= m_max_sessions)
m_sessions.erase(m_sessions.begin());
}
const std::string session_id_str = hex_encode(session.session_id());
m_sessions[session_id_str] = session.encrypt(m_session_key, m_rng);
const std::string hostname = session.sni_hostname();
if(session.side() == CLIENT && hostname != "")
m_host_sessions[hostname + ":" + std::to_string(port)] = session_id_str;
}
}
}
|
