summaryrefslogtreecommitdiff
path: root/package/network/services/uhttpd/src/uhttpd-tls.c
blob: 9c6eb81db3f5283934295930f8eead45b605beed (plain)
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
/*
 * uhttpd - Tiny single-threaded httpd - TLS helper
 *
 *   Copyright (C) 2010 Jo-Philipp Wich <xm@subsignal.org>
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

#include "uhttpd.h"
#include "uhttpd-tls.h"
#include "uhttpd-utils.h"

#include <syslog.h>
#define dbg(...) syslog(LOG_INFO, __VA_ARGS__)

SSL_CTX * uh_tls_ctx_init(void)
{
	SSL_CTX *c;

	SSL_load_error_strings();
	SSL_library_init();

#if TLS_IS_OPENSSL
	if ((c = SSL_CTX_new(SSLv23_server_method())) != NULL)
#else
	if ((c = SSL_CTX_new(TLSv1_server_method())) != NULL)
#endif
		SSL_CTX_set_verify(c, SSL_VERIFY_NONE, NULL);

	return c;
}

int uh_tls_ctx_cert(SSL_CTX *c, const char *file)
{
	int rv;

	if( (rv = SSL_CTX_use_certificate_file(c, file, SSL_FILETYPE_PEM)) < 1 )
		rv = SSL_CTX_use_certificate_file(c, file, SSL_FILETYPE_ASN1);

	return rv;
}

int uh_tls_ctx_key(SSL_CTX *c, const char *file)
{
	int rv;

	if( (rv = SSL_CTX_use_PrivateKey_file(c, file, SSL_FILETYPE_PEM)) < 1 )
		rv = SSL_CTX_use_PrivateKey_file(c, file, SSL_FILETYPE_ASN1);

	return rv;
}

void uh_tls_ctx_free(struct listener *l)
{
	SSL_CTX_free(l->tls);
}


int uh_tls_client_accept(struct client *c)
{
	int rv, err;
	int fd = c->fd.fd;

	if (!c->server || !c->server->tls)
	{
		c->tls = NULL;
		return 1;
	}

	if ((c->tls = SSL_new(c->server->tls)))
	{
		if ((rv = SSL_set_fd(c->tls, fd)) < 1)
		{
			SSL_free(c->tls);
			c->tls = NULL;
		}
		else
		{
			while (true)
			{
				rv = SSL_accept(c->tls);
				err = SSL_get_error(c->tls, rv);

				if ((rv != 1) &&
					(err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE))
				{
					if (uh_socket_wait(fd, c->server->conf->network_timeout,
									   (err == SSL_ERROR_WANT_WRITE)))
					{
						D("TLS: accept(%d) = retry\n", fd);
						continue;
					}

					D("TLS: accept(%d) = timeout\n", fd);
				}
				else if (rv == 1)
				{
					D("TLS: accept(%d) = %p\n", fd, c->tls);
					return 1;
				}

#ifdef TLS_IS_OPENSSL
				D("TLS: accept(%d) = failed: %s\n",
				  fd, ERR_error_string(ERR_get_error(), NULL));
#endif

				SSL_free(c->tls);
				c->tls = NULL;
				break;
			}
		}
	}

	return 0;
}

int uh_tls_client_recv(struct client *c, char *buf, int len)
{
	int rv = SSL_read(c->tls, buf, len);
	int err = SSL_get_error(c->tls, 0);

	if ((rv == -1) && (err == SSL_ERROR_WANT_READ))
	{
		D("TLS: recv(%d, %d) = retry\n", c->fd.fd, len);
		errno = EAGAIN;
		return -1;
	}

	D("TLS: recv(%d, %d) = %d\n", c->fd.fd, len, rv);
	return rv;
}

int uh_tls_client_send(struct client *c, const char *buf, int len)
{
	int rv = SSL_write(c->tls, buf, len);
	int err = SSL_get_error(c->tls, 0);

	if ((rv == -1) && (err == SSL_ERROR_WANT_WRITE))
	{
		D("TLS: send(%d, %d) = retry\n", c->fd.fd, len);
		errno = EAGAIN;
		return -1;
	}

	D("TLS: send(%d, %d) = %d\n", c->fd.fd, len, rv);
	return rv;
}

void uh_tls_client_close(struct client *c)
{
	if (c->tls)
	{
		D("TLS: close(%d)\n", c->fd.fd);

		SSL_shutdown(c->tls);
		SSL_free(c->tls);

		c->tls = NULL;
	}
}