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24 * @brief Structures and prototypes for TLS wrappers
26 * @copyright 2010 Network RADIUS SARL <info@networkradius.com>
31 #include <freeradius-devel/conffile.h>
34 * For RH 9, which apparently needs this.
36 #ifndef OPENSSL_NO_KRB5
37 # define OPENSSL_NO_KRB5
39 #include <openssl/err.h>
40 #ifdef HAVE_OPENSSL_ENGINE_H
41 # include <openssl/engine.h>
43 #include <openssl/ssl.h>
49 typedef struct fr_tls_server_conf_t fr_tls_server_conf_t;
52 FR_TLS_INVALID = 0, /* invalid, don't reply */
53 FR_TLS_REQUEST, /* request, ok to send, invalid to receive */
54 FR_TLS_RESPONSE, /* response, ok to receive, invalid to send */
55 FR_TLS_SUCCESS, /* success, send success */
56 FR_TLS_FAIL, /* fail, send fail */
57 FR_TLS_NOOP, /* noop, continue */
59 FR_TLS_START, /* start, ok to send, invalid to receive */
60 FR_TLS_OK, /* ok, continue */
61 FR_TLS_ACK, /* acknowledge, continue */
62 FR_TLS_FIRST_FRAGMENT, /* first fragment */
63 FR_TLS_MORE_FRAGMENTS, /* more fragments, to send/receive */
64 FR_TLS_LENGTH_INCLUDED, /* length included */
65 FR_TLS_MORE_FRAGMENTS_WITH_LENGTH, /* more fragments with length */
66 FR_TLS_HANDLED /* tls code has handled it */
69 #define MAX_RECORD_SIZE 16384
72 * A single TLS record may be up to 16384 octets in length, but a
73 * TLS message may span multiple TLS records, and a TLS
74 * certificate message may in principle be as long as 16MB.
76 * However, note that in order to protect against reassembly
77 * lockup and denial of service attacks, it may be desirable for
78 * an implementation to set a maximum size for one such group of
81 * The TLS Message Length field is four octets, and provides the
82 * total length of the TLS message or set of messages that is
83 * being fragmented; this simplifies buffer allocation.
87 * FIXME: Dynamic allocation of buffer to overcome MAX_RECORD_SIZE overflows.
88 * or configure TLS not to exceed MAX_RECORD_SIZE.
90 typedef struct _record_t {
91 unsigned char data[MAX_RECORD_SIZE];
95 typedef struct _tls_info_t {
97 unsigned char content_type;
98 unsigned char handshake_type;
99 unsigned char alert_level;
100 unsigned char alert_description;
101 char info_description[256];
108 * tls_session_t Structure gets stored as opaque in eap_handler_t
109 * This contains EAP-REQUEST specific data
110 * (ie FR_TLS_DATA(fragment), EAPTLS-ALERT, EAPTLS-REQUEST ...)
112 * clean_in - data that needs to be sent but only after it is soiled.
113 * dirty_in - data EAP server receives.
114 * clean_out - data that is cleaned after receiving.
115 * dirty_out - data EAP server sends.
116 * offset - current fragment size transmitted
117 * fragment - Flag, In fragment mode or not.
118 * tls_msg_len - Actual/Total TLS message length.
119 * length_flag - A flag to include length in every TLS Data/Alert packet
120 * if set to no then only the first fragment contains length
122 typedef struct _tls_session_t {
134 void (*record_init)(record_t *buf);
135 void (*record_close)(record_t *buf);
136 unsigned int (*record_plus)(record_t *buf, void const *ptr,
138 unsigned int (*record_minus)(record_t *buf, void *ptr,
141 bool invalid_hb_used;
144 * Framed-MTU attribute in RADIUS,
145 * if present, can also be used to set this
148 unsigned int tls_msg_len;
154 * Used by TTLS & PEAP to keep track of other per-session
158 void (*free_opaque)(void *opaque);
160 char const *prf_label;
161 int allow_session_resumption;
166 * RFC 2716, Section 4.2:
175 * L = Length included
180 #define TLS_START(x) (((x) & 0x20) != 0)
181 #define TLS_MORE_FRAGMENTS(x) (((x) & 0x40) != 0)
182 #define TLS_LENGTH_INCLUDED(x) (((x) & 0x80) != 0)
184 #define TLS_CHANGE_CIPHER_SPEC(x) (((x) & 0x0014) == 0x0014)
185 #define TLS_ALERT(x) (((x) & 0x0015) == 0x0015)
186 #define TLS_HANDSHAKE(x) (((x) & 0x0016) == 0x0016)
188 #define SET_START(x) ((x) | (0x20))
189 #define SET_MORE_FRAGMENTS(x) ((x) | (0x40))
190 #define SET_LENGTH_INCLUDED(x) ((x) | (0x80))
193 * Following enums from rfc2246
195 * Hmm... since we dpeend on OpenSSL, it would be smarter to
196 * use the OpenSSL names for these.
199 change_cipher_spec = 20,
202 application_data = 23
210 enum AlertDescription {
212 unexpected_message = 10,
214 decryption_failed = 21,
215 record_overflow = 22,
216 decompression_failure = 30,
217 handshake_failure = 40,
218 bad_certificate = 42,
219 unsupported_certificate = 43,
220 certificate_revoked = 44,
221 certificate_expired = 45,
222 certificate_unknown = 46,
223 illegal_parameter = 47,
228 export_restriction = 60,
229 protocol_version = 70,
230 insufficient_security = 71,
233 no_renegotiation = 100
241 server_key_exchange = 12,
242 certificate_request = 13,
243 server_hello_done = 14,
244 certificate_verify = 15,
245 client_key_exchange = 16,
264 The L bit (length included) is set to indicate the presence of the
265 four octet TLS Message Length field, and MUST be set for the first
266 fragment of a fragmented TLS message or set of messages. The M bit
267 (more fragments) is set on all but the last fragment. The S bit
268 (EAP-TLS start) is set in an EAP-TLS Start message. This
269 differentiates the EAP-TLS Start message from a fragment
274 The TLS Message Length field is four octets, and is present only
275 if the L bit is set. This field provides the total length of the
276 TLS message or set of messages that is being fragmented.
280 The TLS data consists of the encapsulated TLS packet in TLS record
283 * The data structures present here
284 * maps only to the typedata in the EAP packet
286 * Based on the L bit flag, first 4 bytes of data indicate the length
290 int cbtls_password(char *buf, int num, int rwflag, void *userdata);
291 void cbtls_info(SSL const *s, int where, int ret);
292 void cbtls_msg(int write_p, int msg_version, int content_type, void const *buf, size_t len, SSL *ssl,
294 int cbtls_verify(int ok, X509_STORE_CTX *ctx);
297 void tls_global_init(void);
298 int tls_global_version_check(char const *acknowledged);
299 void tls_global_cleanup(void);
300 tls_session_t *tls_new_session(TALLOC_CTX *ctx, fr_tls_server_conf_t *conf, REQUEST *request, bool client_cert);
301 tls_session_t *tls_new_client_session(fr_tls_server_conf_t *conf, int fd);
302 fr_tls_server_conf_t *tls_server_conf_parse(CONF_SECTION *cs);
303 fr_tls_server_conf_t *tls_client_conf_parse(CONF_SECTION *cs);
304 int tls_handshake_recv(REQUEST *, tls_session_t *ssn);
305 int tls_handshake_send(REQUEST *, tls_session_t *ssn);
306 void tls_session_information(tls_session_t *ssn);
309 * Low-level TLS stuff
311 int tls_success(tls_session_t *ssn, REQUEST *request);
312 void tls_fail(tls_session_t *ssn);
313 fr_tls_status_t tls_ack_handler(tls_session_t *tls_session, REQUEST *request);
314 fr_tls_status_t tls_application_data(tls_session_t *ssn, REQUEST *request);
317 void session_close(tls_session_t *ssn);
318 void session_init(tls_session_t *ssn);
320 #define FR_TLS_EX_INDEX_HANDLER (10)
321 #define FR_TLS_EX_INDEX_CONF (11)
322 #define FR_TLS_EX_INDEX_REQUEST (12)
323 #define FR_TLS_EX_INDEX_IDENTITY (13)
324 #define FR_TLS_EX_INDEX_STORE (14)
325 #define FR_TLS_EX_INDEX_SSN (15)
326 #define FR_TLS_EX_INDEX_TALLOC (16)
328 extern int FR_TLS_EX_INDEX_CERTS;
330 /* configured values goes right here */
331 struct fr_tls_server_conf_t {
335 char const *private_key_password;
336 char const *private_key_file;
337 char const *certificate_file;
338 char const *random_file;
342 char const *rsa_file;
345 uint32_t rsa_key_length;
346 uint32_t dh_key_length;
347 uint32_t verify_depth;
352 * Always < 4096 (due to radius limit), 0 by default = 2048
354 uint32_t fragment_size;
356 bool allow_expired_crl;
357 char const *check_cert_cn;
358 char const *cipher_list;
359 char const *check_cert_issuer;
361 bool session_cache_enable;
362 uint32_t session_timeout;
363 uint32_t session_cache_size;
364 char const *session_id_name;
365 char const *session_cache_path;
366 char session_context_id[SSL_MAX_SSL_SESSION_ID_LENGTH];
367 time_t session_last_flushed;
369 char const *verify_tmp_dir;
370 char const *verify_client_cert_cmd;
371 bool require_client_cert;
373 #ifdef HAVE_OPENSSL_OCSP_H
378 bool ocsp_override_url;
379 char const *ocsp_url;
381 X509_STORE *ocsp_store;
382 uint32_t ocsp_timeout;
386 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
387 #ifndef OPENSSL_NO_ECDH
388 char const *ecdh_curve;
392 #ifdef PSK_MAX_IDENTITY_LEN
393 char const *psk_identity;
394 char const *psk_password;
403 #endif /* WITH_TLS */
404 #endif /* FR_TLS_H */