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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.
68 extern FR_NAME_NUMBER const fr_tls_status_table[];
70 #define MAX_RECORD_SIZE 16384
73 * A single TLS record may be up to 16384 octets in length, but a
74 * TLS message may span multiple TLS records, and a TLS
75 * certificate message may in principle be as long as 16MB.
77 * However, note that in order to protect against reassembly
78 * lockup and denial of service attacks, it may be desirable for
79 * an implementation to set a maximum size for one such group of
82 * The TLS Message Length field is four octets, and provides the
83 * total length of the TLS message or set of messages that is
84 * being fragmented; this simplifies buffer allocation.
88 * FIXME: Dynamic allocation of buffer to overcome MAX_RECORD_SIZE overflows.
89 * or configure TLS not to exceed MAX_RECORD_SIZE.
91 typedef struct _record_t {
92 uint8_t data[MAX_RECORD_SIZE];
96 typedef struct _tls_info_t {
99 uint8_t handshake_type;
101 uint8_t alert_description;
104 char info_description[256];
110 * tls_session_t Structure gets stored as opaque in eap_handler_t
111 * This contains EAP-REQUEST specific data
112 * (ie FR_TLS_DATA(fragment), EAPTLS-ALERT, EAPTLS-REQUEST ...)
114 * clean_in - data that needs to be sent but only after it is soiled.
115 * dirty_in - data EAP server receives.
116 * clean_out - data that is cleaned after receiving.
117 * dirty_out - data EAP server sends.
118 * mtu - current fragment size transmitted
119 * fragment - Flag, In fragment mode or not.
120 * tls_msg_len - Actual/Total TLS message length.
121 * length_flag - A flag to include length in every TLS Data/Alert packet
122 * if set to no then only the first fragment contains length
124 typedef struct _tls_session_t {
136 void (*record_init)(record_t *buf);
137 void (*record_close)(record_t *buf);
138 unsigned int (*record_plus)(record_t *buf, void const *ptr,
140 unsigned int (*record_minus)(record_t *buf, void *ptr,
143 bool invalid_hb_used;
146 * Framed-MTU attribute in RADIUS,
147 * if present, can also be used to set this
156 * Used by TTLS & PEAP to keep track of other per-session
160 void (*free_opaque)(void *opaque);
162 char const *prf_label;
163 int allow_session_resumption;
168 * RFC 2716, Section 4.2:
177 * L = Length included
182 #define TLS_START(x) (((x) & 0x20) != 0)
183 #define TLS_MORE_FRAGMENTS(x) (((x) & 0x40) != 0)
184 #define TLS_LENGTH_INCLUDED(x) (((x) & 0x80) != 0)
186 #define TLS_CHANGE_CIPHER_SPEC(x) (((x) & 0x0014) == 0x0014)
187 #define TLS_ALERT(x) (((x) & 0x0015) == 0x0015)
188 #define TLS_HANDSHAKE(x) (((x) & 0x0016) == 0x0016)
190 #define SET_START(x) ((x) | (0x20))
191 #define SET_MORE_FRAGMENTS(x) ((x) | (0x40))
192 #define SET_LENGTH_INCLUDED(x) ((x) | (0x80))
195 * Following enums from rfc2246
197 * Hmm... since we dpeend on OpenSSL, it would be smarter to
198 * use the OpenSSL names for these.
201 change_cipher_spec = 20,
204 application_data = 23
212 enum AlertDescription {
214 unexpected_message = 10,
216 decryption_failed = 21,
217 record_overflow = 22,
218 decompression_failure = 30,
219 handshake_failure = 40,
220 bad_certificate = 42,
221 unsupported_certificate = 43,
222 certificate_revoked = 44,
223 certificate_expired = 45,
224 certificate_unknown = 46,
225 illegal_parameter = 47,
230 export_restriction = 60,
231 protocol_version = 70,
232 insufficient_security = 71,
235 no_renegotiation = 100
243 server_key_exchange = 12,
244 certificate_request = 13,
245 server_hello_done = 14,
246 certificate_verify = 15,
247 client_key_exchange = 16,
248 handshake_finished = 20
266 The L bit (length included) is set to indicate the presence of the
267 four octet TLS Message Length field, and MUST be set for the first
268 fragment of a fragmented TLS message or set of messages. The M bit
269 (more fragments) is set on all but the last fragment. The S bit
270 (EAP-TLS start) is set in an EAP-TLS Start message. This
271 differentiates the EAP-TLS Start message from a fragment
276 The TLS Message Length field is four octets, and is present only
277 if the L bit is set. This field provides the total length of the
278 TLS message or set of messages that is being fragmented.
282 The TLS data consists of the encapsulated TLS packet in TLS record
285 * The data structures present here
286 * maps only to the typedata in the EAP packet
288 * Based on the L bit flag, first 4 bytes of data indicate the length
292 int cbtls_password(char *buf, int num, int rwflag, void *userdata);
293 void cbtls_info(SSL const *s, int where, int ret);
294 void cbtls_msg(int write_p, int msg_version, int content_type, void const *buf, size_t len, SSL *ssl,
296 int cbtls_verify(int ok, X509_STORE_CTX *ctx);
299 void tls_global_init(void);
300 #ifdef ENABLE_OPENSSL_VERSION_CHECK
301 int tls_global_version_check(char const *acknowledged);
303 void tls_global_cleanup(void);
304 tls_session_t *tls_new_session(TALLOC_CTX *ctx, fr_tls_server_conf_t *conf, REQUEST *request, bool client_cert);
305 tls_session_t *tls_new_client_session(TALLOC_CTX *ctx, fr_tls_server_conf_t *conf, int fd);
306 fr_tls_server_conf_t *tls_server_conf_parse(CONF_SECTION *cs);
307 fr_tls_server_conf_t *tls_client_conf_parse(CONF_SECTION *cs);
308 SSL_CTX *tls_init_ctx(fr_tls_server_conf_t *conf, int client);
309 int tls_handshake_recv(REQUEST *, tls_session_t *ssn);
310 int tls_handshake_send(REQUEST *, tls_session_t *ssn);
311 void tls_session_information(tls_session_t *ssn);
314 * Low-level TLS stuff
316 int tls_success(tls_session_t *ssn, REQUEST *request);
317 void tls_fail(tls_session_t *ssn);
318 fr_tls_status_t tls_ack_handler(tls_session_t *tls_session, REQUEST *request);
319 fr_tls_status_t tls_application_data(tls_session_t *ssn, REQUEST *request);
321 #define FR_TLS_EX_INDEX_HANDLER (10)
322 #define FR_TLS_EX_INDEX_CONF (11)
323 #define FR_TLS_EX_INDEX_REQUEST (12)
324 #define FR_TLS_EX_INDEX_IDENTITY (13)
325 #define FR_TLS_EX_INDEX_STORE (14)
326 #define FR_TLS_EX_INDEX_SSN (15)
327 #define FR_TLS_EX_INDEX_TALLOC (16)
329 extern int fr_tls_ex_index_certs;
331 /* configured values goes right here */
332 struct fr_tls_server_conf_t {
336 char const *private_key_password;
337 char const *private_key_file;
338 char const *certificate_file;
339 char const *random_file;
343 char const *rsa_file;
346 uint32_t rsa_key_length;
347 uint32_t dh_key_length;
348 uint32_t verify_depth;
352 bool disable_tlsv1_1;
353 bool disable_tlsv1_2;
356 * Always < 4096 (due to radius limit), 0 by default = 2048
358 uint32_t fragment_size;
360 bool allow_expired_crl;
361 char const *check_cert_cn;
362 char const *cipher_list;
363 char const *check_cert_issuer;
365 bool session_cache_enable;
366 uint32_t session_timeout;
367 uint32_t session_cache_size;
368 char const *session_id_name;
369 char const *session_cache_path;
370 char session_context_id[SSL_MAX_SSL_SESSION_ID_LENGTH];
371 time_t session_last_flushed;
373 char const *verify_tmp_dir;
374 char const *verify_client_cert_cmd;
375 bool require_client_cert;
377 #ifdef HAVE_OPENSSL_OCSP_H
382 bool ocsp_override_url;
383 char const *ocsp_url;
385 X509_STORE *ocsp_store;
386 uint32_t ocsp_timeout;
390 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
391 #ifndef OPENSSL_NO_ECDH
392 char const *ecdh_curve;
396 #ifdef PSK_MAX_IDENTITY_LEN
397 char const *psk_identity;
398 char const *psk_password;
399 char const *psk_query;
408 #endif /* WITH_TLS */
409 #endif /* FR_TLS_H */