2 * ustream-ssl - library for SSL over ustream
4 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 #include <sys/types.h>
25 #include "ustream-ssl.h"
26 #include "ustream-internal.h"
28 static int urandom_fd
= -1;
30 static int s_ustream_read(void *ctx
, unsigned char *buf
, size_t len
)
32 struct ustream
*s
= ctx
;
39 sbuf
= ustream_get_read_buf(s
, &slen
);
44 return MBEDTLS_ERR_SSL_WANT_READ
;
46 memcpy(buf
, sbuf
, slen
);
47 ustream_consume(s
, slen
);
52 static int s_ustream_write(void *ctx
, const unsigned char *buf
, size_t len
)
54 struct ustream
*s
= ctx
;
57 ret
= ustream_write(s
, (const char *) buf
, len
, false);
58 if (ret
< 0 || s
->write_error
)
59 return MBEDTLS_ERR_NET_SEND_FAILED
;
64 __hidden
void ustream_set_io(struct ustream_ssl_ctx
*ctx
, void *ssl
, struct ustream
*conn
)
66 mbedtls_ssl_set_bio(ssl
, conn
, s_ustream_write
, s_ustream_read
, NULL
);
69 static bool urandom_init(void)
74 urandom_fd
= open("/dev/urandom", O_RDONLY
);
81 static int _urandom(void *ctx
, unsigned char *out
, size_t len
)
83 if (read(urandom_fd
, out
, len
) < 0)
84 return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
;
89 #define AES_GCM_CIPHERS(v) \
90 MBEDTLS_TLS_##v##_WITH_AES_128_GCM_SHA256, \
91 MBEDTLS_TLS_##v##_WITH_AES_256_GCM_SHA384
93 #define AES_CBC_CIPHERS(v) \
94 MBEDTLS_TLS_##v##_WITH_AES_128_CBC_SHA, \
95 MBEDTLS_TLS_##v##_WITH_AES_256_CBC_SHA
97 #define AES_CIPHERS(v) \
101 static const int default_ciphersuites_server
[] =
103 MBEDTLS_TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
,
104 AES_GCM_CIPHERS(ECDHE_ECDSA
),
105 MBEDTLS_TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
,
106 AES_GCM_CIPHERS(ECDHE_RSA
),
107 AES_CBC_CIPHERS(ECDHE_RSA
),
112 static const int default_ciphersuites_client
[] =
114 MBEDTLS_TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
,
115 AES_GCM_CIPHERS(ECDHE_ECDSA
),
116 MBEDTLS_TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
,
117 AES_GCM_CIPHERS(ECDHE_RSA
),
118 MBEDTLS_TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256
,
119 AES_GCM_CIPHERS(DHE_RSA
),
120 AES_CBC_CIPHERS(ECDHE_ECDSA
),
121 AES_CBC_CIPHERS(ECDHE_RSA
),
122 AES_CBC_CIPHERS(DHE_RSA
),
123 MBEDTLS_TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA
,
125 MBEDTLS_TLS_RSA_WITH_3DES_EDE_CBC_SHA
,
130 __hidden
struct ustream_ssl_ctx
*
131 __ustream_ssl_context_new(bool server
)
133 struct ustream_ssl_ctx
*ctx
;
134 mbedtls_ssl_config
*conf
;
140 ctx
= calloc(1, sizeof(*ctx
));
144 ctx
->server
= server
;
145 mbedtls_pk_init(&ctx
->key
);
146 mbedtls_x509_crt_init(&ctx
->cert
);
147 mbedtls_x509_crt_init(&ctx
->ca_cert
);
149 #if defined(MBEDTLS_SSL_CACHE_C)
150 mbedtls_ssl_cache_init(&ctx
->cache
);
151 mbedtls_ssl_cache_set_timeout(&ctx
->cache
, 30 * 60);
152 mbedtls_ssl_cache_set_max_entries(&ctx
->cache
, 5);
156 mbedtls_ssl_config_init(conf
);
158 ep
= server
? MBEDTLS_SSL_IS_SERVER
: MBEDTLS_SSL_IS_CLIENT
;
160 mbedtls_ssl_config_defaults(conf
, ep
, MBEDTLS_SSL_TRANSPORT_STREAM
,
161 MBEDTLS_SSL_PRESET_DEFAULT
);
162 mbedtls_ssl_conf_authmode(conf
, MBEDTLS_SSL_VERIFY_NONE
);
163 mbedtls_ssl_conf_rng(conf
, _urandom
, NULL
);
166 mbedtls_ssl_conf_ciphersuites(conf
, default_ciphersuites_server
);
167 mbedtls_ssl_conf_min_version(conf
, MBEDTLS_SSL_MAJOR_VERSION_3
,
168 MBEDTLS_SSL_MINOR_VERSION_3
);
170 mbedtls_ssl_conf_ciphersuites(conf
, default_ciphersuites_client
);
172 #if defined(MBEDTLS_SSL_CACHE_C)
173 mbedtls_ssl_conf_session_cache(conf
, &ctx
->cache
,
174 mbedtls_ssl_cache_get
,
175 mbedtls_ssl_cache_set
);
180 static void ustream_ssl_update_own_cert(struct ustream_ssl_ctx
*ctx
)
182 if (!ctx
->cert
.version
)
185 if (!ctx
->key
.pk_info
)
188 mbedtls_ssl_conf_own_cert(&ctx
->conf
, &ctx
->cert
, &ctx
->key
);
191 __hidden
int __ustream_ssl_add_ca_crt_file(struct ustream_ssl_ctx
*ctx
, const char *file
)
195 ret
= mbedtls_x509_crt_parse_file(&ctx
->ca_cert
, file
);
199 mbedtls_ssl_conf_ca_chain(&ctx
->conf
, &ctx
->ca_cert
, NULL
);
200 mbedtls_ssl_conf_authmode(&ctx
->conf
, MBEDTLS_SSL_VERIFY_OPTIONAL
);
204 __hidden
int __ustream_ssl_set_crt_file(struct ustream_ssl_ctx
*ctx
, const char *file
)
208 ret
= mbedtls_x509_crt_parse_file(&ctx
->cert
, file
);
212 ustream_ssl_update_own_cert(ctx
);
216 __hidden
int __ustream_ssl_set_key_file(struct ustream_ssl_ctx
*ctx
, const char *file
)
220 ret
= mbedtls_pk_parse_keyfile(&ctx
->key
, file
, NULL
);
224 ustream_ssl_update_own_cert(ctx
);
228 __hidden
int __ustream_ssl_set_ciphers(struct ustream_ssl_ctx
*ctx
, const char *ciphers
)
230 int *ciphersuites
= NULL
, *tmp
, id
;
231 char *cipherstr
, *p
, *last
, c
;
237 cipherstr
= strdup(ciphers
);
239 if (cipherstr
== NULL
)
242 for (p
= cipherstr
, last
= p
;; p
++) {
243 if (*p
== ':' || *p
== 0) {
247 id
= mbedtls_ssl_get_ciphersuite_id(last
);
250 tmp
= realloc(ciphersuites
, (len
+ 2) * sizeof(int));
260 ciphersuites
[len
++] = id
;
261 ciphersuites
[len
] = 0;
271 * mbedTLS expects cipher names with dashes while many sources elsewhere
272 * like the Firefox wiki or Wireshark specify ciphers with underscores,
273 * so simply convert all underscores to dashes to accept both notations.
275 else if (*p
== '_') {
285 mbedtls_ssl_conf_ciphersuites(&ctx
->conf
, ciphersuites
);
286 free(ctx
->ciphersuites
);
288 ctx
->ciphersuites
= ciphersuites
;
293 __hidden
void __ustream_ssl_context_free(struct ustream_ssl_ctx
*ctx
)
295 #if defined(MBEDTLS_SSL_CACHE_C)
296 mbedtls_ssl_cache_free(&ctx
->cache
);
298 mbedtls_pk_free(&ctx
->key
);
299 mbedtls_x509_crt_free(&ctx
->ca_cert
);
300 mbedtls_x509_crt_free(&ctx
->cert
);
301 mbedtls_ssl_config_free(&ctx
->conf
);
302 free(ctx
->ciphersuites
);
306 static void ustream_ssl_error(struct ustream_ssl
*us
, int ret
)
309 uloop_timeout_set(&us
->error_timer
, 0);
312 static bool ssl_do_wait(int ret
)
315 case MBEDTLS_ERR_SSL_WANT_READ
:
316 case MBEDTLS_ERR_SSL_WANT_WRITE
:
323 static void ustream_ssl_verify_cert(struct ustream_ssl
*us
)
326 const char *msg
= NULL
;
330 r
= mbedtls_ssl_get_verify_result(ssl
);
331 cn_mismatch
= r
& MBEDTLS_X509_BADCERT_CN_MISMATCH
;
332 r
&= ~MBEDTLS_X509_BADCERT_CN_MISMATCH
;
334 if (r
& MBEDTLS_X509_BADCERT_EXPIRED
)
335 msg
= "certificate has expired";
336 else if (r
& MBEDTLS_X509_BADCERT_REVOKED
)
337 msg
= "certificate has been revoked";
338 else if (r
& MBEDTLS_X509_BADCERT_NOT_TRUSTED
)
339 msg
= "certificate is self-signed or not signed by a trusted CA";
341 msg
= "unknown error";
344 if (us
->notify_verify_error
)
345 us
->notify_verify_error(us
, r
, msg
);
353 __hidden
enum ssl_conn_status
__ustream_ssl_connect(struct ustream_ssl
*us
)
358 r
= mbedtls_ssl_handshake(ssl
);
360 ustream_ssl_verify_cert(us
);
365 return U_SSL_PENDING
;
367 ustream_ssl_error(us
, r
);
371 __hidden
int __ustream_ssl_write(struct ustream_ssl
*us
, const char *buf
, int len
)
374 int done
= 0, ret
= 0;
376 while (done
!= len
) {
377 ret
= mbedtls_ssl_write(ssl
, (const unsigned char *) buf
+ done
, len
- done
);
380 if (ssl_do_wait(ret
))
383 ustream_ssl_error(us
, ret
);
393 __hidden
int __ustream_ssl_read(struct ustream_ssl
*us
, char *buf
, int len
)
395 int ret
= mbedtls_ssl_read(us
->ssl
, (unsigned char *) buf
, len
);
398 if (ssl_do_wait(ret
))
399 return U_SSL_PENDING
;
401 if (ret
== MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY
)
404 ustream_ssl_error(us
, ret
);
411 __hidden
void *__ustream_ssl_session_new(struct ustream_ssl_ctx
*ctx
)
413 mbedtls_ssl_context
*ssl
;
415 ssl
= calloc(1, sizeof(*ssl
));
419 mbedtls_ssl_init(ssl
);
421 if (mbedtls_ssl_setup(ssl
, &ctx
->conf
)) {
429 __hidden
void __ustream_ssl_session_free(void *ssl
)
431 mbedtls_ssl_free(ssl
);