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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/*
This file is part of libmicrohttpd
(C) 2007, 2008, 2010 Daniel Pittman and Christian Grothoff
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file connection_https.c
* @brief Methods for managing SSL/TLS connections. This file is only
* compiled if ENABLE_HTTPS is set.
* @author Sagie Amir
* @author Christian Grothoff
*/
#include "internal.h"
#include "connection.h"
#include "memorypool.h"
#include "response.h"
#include "reason_phrase.h"
#include <gnutls/gnutls.h>
/**
* This function handles a particular SSL/TLS connection when
* it has been determined that there is data to be read off a
* socket. Message processing is done by message type which is
* determined by peeking into the first message type byte of the
* stream.
*
* Error message handling: all fatal level messages cause the
* connection to be terminated.
*
* Application data is forwarded to the underlying daemon for
* processing.
*
* @param connection the source connection
* @return always MHD_YES (we should continue to process the connection)
*/
static int
MHD_tls_connection_handle_read (struct MHD_Connection *connection)
{
int ret;
connection->last_activity = time (NULL);
if (connection->state == MHD_TLS_CONNECTION_INIT)
{
ret = gnutls_handshake (connection->tls_session);
if (ret == GNUTLS_E_SUCCESS)
{
/* set connection state to enable HTTP processing */
connection->state = MHD_CONNECTION_INIT;
return MHD_YES;
}
if ( (ret == GNUTLS_E_AGAIN) ||
(ret == GNUTLS_E_INTERRUPTED) )
{
/* handshake not done */
return MHD_YES;
}
/* handshake failed */
#if HAVE_MESSAGES
MHD_DLOG (connection->daemon,
"Error: received handshake message out of context\n");
#endif
MHD_connection_close (connection,
MHD_REQUEST_TERMINATED_WITH_ERROR);
return MHD_YES;
}
return MHD_connection_handle_read (connection);
}
/**
* This function was created to handle writes to sockets when it has
* been determined that the socket can be written to. This function
* will forward all write requests to the underlying daemon unless
* the connection has been marked for closing.
*
* @return always MHD_YES (we should continue to process the connection)
*/
static int
MHD_tls_connection_handle_write (struct MHD_Connection *connection)
{
int ret;
connection->last_activity = time (NULL);
#if DEBUG_STATES
MHD_DLOG (connection->daemon, "%s: state: %s\n",
__FUNCTION__, MHD_state_to_string (connection->state));
#endif
if (connection->state == MHD_TLS_CONNECTION_INIT)
{
ret = gnutls_handshake (connection->tls_session);
if (ret == GNUTLS_E_SUCCESS)
{
/* set connection state to enable HTTP processing */
connection->state = MHD_CONNECTION_INIT;
return MHD_YES;
}
if ( (ret == GNUTLS_E_AGAIN) ||
(ret == GNUTLS_E_INTERRUPTED) )
{
/* handshake not done */
return MHD_YES;
}
/* handshake failed */
#if HAVE_MESSAGES
MHD_DLOG (connection->daemon,
"Error: received handshake message out of context\n");
#endif
MHD_connection_close (connection,
MHD_REQUEST_TERMINATED_WITH_ERROR);
return MHD_YES;
}
return MHD_connection_handle_write (connection);
}
/**
* This function was created to handle per-connection processing that
* has to happen even if the socket cannot be read or written to. All
* implementations (multithreaded, external select, internal select)
* call this function.
*
* @param connection being handled
* @return MHD_YES if we should continue to process the
* connection (not dead yet), MHD_NO if it died
*/
static int
MHD_tls_connection_handle_idle (struct MHD_Connection *connection)
{
unsigned int timeout;
#if DEBUG_STATES
MHD_DLOG (connection->daemon, "%s: state: %s\n",
__FUNCTION__, MHD_state_to_string (connection->state));
#endif
timeout = connection->daemon->connection_timeout;
if ( (timeout != 0) && (time (NULL) - timeout > connection->last_activity))
MHD_connection_close (connection,
MHD_REQUEST_TERMINATED_TIMEOUT_REACHED);
switch (connection->state)
{
/* on newly created connections we might reach here before any reply has been received */
case MHD_TLS_CONNECTION_INIT:
return MHD_YES;
/* close connection if necessary */
case MHD_CONNECTION_CLOSED:
gnutls_bye (connection->tls_session, GNUTLS_SHUT_RDWR);
return MHD_connection_handle_idle (connection);
default:
if ( (0 != gnutls_record_check_pending (connection->tls_session)) &&
(MHD_YES != MHD_tls_connection_handle_read (connection)) )
return MHD_YES;
return MHD_connection_handle_idle (connection);
}
return MHD_YES;
}
/**
* Set connection callback function to be used through out
* the processing of this secure connection.
*/
void
MHD_set_https_callbacks (struct MHD_Connection *connection)
{
connection->read_handler = &MHD_tls_connection_handle_read;
connection->write_handler = &MHD_tls_connection_handle_write;
connection->idle_handler = &MHD_tls_connection_handle_idle;
}
/* end of connection_https.c */
|
