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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];
109 #if OPENSSL_VERSION_NUMBER < 0x10001000L
110 #define ssl_session ssl->session
112 #define ssl_session session
115 /** Contains EAP-REQUEST specific data (ie FR_TLS_DATA(fragment), EAPTLS-ALERT, EAPTLS-REQUEST ...)
117 * The tls_session_t Structure gets stored as opaque in eap_handler_t
119 typedef struct _tls_session_t {
122 #if OPENSSL_VERSION_NUMBER >= 0x10001000L
123 SSL_SESSION *session;
129 record_t clean_in; //!< Data that needs to be sent but only after it is soiled.
130 record_t clean_out; //!< Data that is cleaned after receiving.
131 record_t dirty_in; //!< Data EAP server receives.
132 record_t dirty_out; //!< Data EAP server sends.
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, unsigned int size);
137 unsigned int (*record_minus)(record_t *buf, void *ptr, unsigned int size);
139 bool invalid_hb_used; //!< Whether heartbleed attack was detected.
140 bool connected; //!< whether the outgoing socket is connected
143 * Framed-MTU attribute in RADIUS, if present, can also be used to set this
145 size_t mtu; //!< Current fragment size transmitted.
146 size_t tls_msg_len; //!< Actual/Total TLS message length.
147 bool fragment; //!< Flag, In fragment mode or not.
148 bool length_flag; //!< A flag to include length in every TLS Data/Alert packet.
149 //!< If set to no then only the first fragment contains length.
152 size_t tls_record_in_total_len; //!< How long the peer indicated the complete tls record
154 size_t tls_record_in_recvd_len; //!< How much of the record we've received so far.
157 * Used by TTLS & PEAP to keep track of other per-session data.
160 void (*free_opaque)(void *opaque);
162 char const *prf_label;
163 bool allow_session_resumption; //!< Whether session resumption is allowed.
167 * RFC 2716, Section 4.2:
176 * L = Length included
181 #define TLS_START(x) (((x) & 0x20) != 0)
182 #define TLS_MORE_FRAGMENTS(x) (((x) & 0x40) != 0)
183 #define TLS_LENGTH_INCLUDED(x) (((x) & 0x80) != 0)
185 #define TLS_CHANGE_CIPHER_SPEC(x) (((x) & 0x0014) == 0x0014)
186 #define TLS_ALERT(x) (((x) & 0x0015) == 0x0015)
187 #define TLS_HANDSHAKE(x) (((x) & 0x0016) == 0x0016)
189 #define SET_START(x) ((x) | (0x20))
190 #define SET_MORE_FRAGMENTS(x) ((x) | (0x40))
191 #define SET_LENGTH_INCLUDED(x) ((x) | (0x80))
194 * Following enums from rfc2246
196 * Hmm... since we dpeend on OpenSSL, it would be smarter to
197 * use the OpenSSL names for these.
200 change_cipher_spec = 20,
203 application_data = 23
211 enum AlertDescription {
213 unexpected_message = 10,
215 decryption_failed = 21,
216 record_overflow = 22,
217 decompression_failure = 30,
218 handshake_failure = 40,
219 bad_certificate = 42,
220 unsupported_certificate = 43,
221 certificate_revoked = 44,
222 certificate_expired = 45,
223 certificate_unknown = 46,
224 illegal_parameter = 47,
229 export_restriction = 60,
230 protocol_version = 70,
231 insufficient_security = 71,
234 no_renegotiation = 100
242 server_key_exchange = 12,
243 certificate_request = 13,
244 server_hello_done = 14,
245 certificate_verify = 15,
246 client_key_exchange = 16,
247 handshake_finished = 20
265 The L bit (length included) is set to indicate the presence of the
266 four octet TLS Message Length field, and MUST be set for the first
267 fragment of a fragmented TLS message or set of messages. The M bit
268 (more fragments) is set on all but the last fragment. The S bit
269 (EAP-TLS start) is set in an EAP-TLS Start message. This
270 differentiates the EAP-TLS Start message from a fragment
275 The TLS Message Length field is four octets, and is present only
276 if the L bit is set. This field provides the total length of the
277 TLS message or set of messages that is being fragmented.
281 The TLS data consists of the encapsulated TLS packet in TLS record
284 * The data structures present here
285 * maps only to the typedata in the EAP packet
287 * Based on the L bit flag, first 4 bytes of data indicate the length
291 int cbtls_password(char *buf, int num, int rwflag, void *userdata);
292 void cbtls_info(SSL const *s, int where, int ret);
293 void cbtls_msg(int write_p, int msg_version, int content_type, void const *buf, size_t len, SSL *ssl,
295 int cbtls_verify(int ok, X509_STORE_CTX *ctx);
298 void tls_global_init(void);
299 #ifdef ENABLE_OPENSSL_VERSION_CHECK
300 int tls_global_version_check(char const *acknowledged);
303 int tls_error_log(REQUEST *request, char const *msg, ...) CC_HINT(format (printf, 2, 3));
304 int tls_error_io_log(REQUEST *request, tls_session_t *session, int ret, char const *msg, ...)
305 CC_HINT(format (printf, 4, 5));
307 void tls_global_cleanup(void);
308 tls_session_t *tls_new_session(TALLOC_CTX *ctx, fr_tls_server_conf_t *conf, REQUEST *request, bool client_cert);
309 tls_session_t *tls_new_client_session(TALLOC_CTX *ctx, fr_tls_server_conf_t *conf, int fd);
310 fr_tls_server_conf_t *tls_server_conf_parse(CONF_SECTION *cs);
311 fr_tls_server_conf_t *tls_client_conf_parse(CONF_SECTION *cs);
312 fr_tls_server_conf_t *tls_server_conf_alloc(TALLOC_CTX *ctx);
313 SSL_CTX *tls_init_ctx(fr_tls_server_conf_t *conf, int client);
314 int tls_handshake_recv(REQUEST *, tls_session_t *ssn);
315 int tls_handshake_send(REQUEST *, tls_session_t *ssn);
316 void tls_session_information(tls_session_t *ssn);
317 void tls_session_id(SSL_SESSION *ssn, char *buffer, size_t bufsize);
320 * Low-level TLS stuff
322 int tls_success(tls_session_t *ssn, REQUEST *request);
323 void tls_fail(tls_session_t *ssn);
324 fr_tls_status_t tls_ack_handler(tls_session_t *tls_session, REQUEST *request);
325 fr_tls_status_t tls_application_data(tls_session_t *ssn, REQUEST *request);
327 #define FR_TLS_EX_INDEX_HANDLER (10)
328 #define FR_TLS_EX_INDEX_CONF (11)
329 #define FR_TLS_EX_INDEX_REQUEST (12)
330 #define FR_TLS_EX_INDEX_IDENTITY (13)
331 #define FR_TLS_EX_INDEX_STORE (14)
332 #define FR_TLS_EX_INDEX_SSN (15)
333 #define FR_TLS_EX_INDEX_TALLOC (16)
335 extern int fr_tls_ex_index_certs;
336 extern int fr_tls_ex_index_vps;
338 /* configured values goes right here */
339 struct fr_tls_server_conf_t {
343 char const *private_key_password;
344 char const *private_key_file;
345 char const *certificate_file;
346 char const *random_file;
350 char const *rsa_file;
351 uint32_t verify_depth;
355 bool disable_single_dh_use;
357 bool disable_tlsv1_1;
358 bool disable_tlsv1_2;
361 * Always < 4096 (due to radius limit), 0 by default = 1024
363 uint32_t fragment_size;
366 bool allow_expired_crl;
367 char const *check_cert_cn;
368 char const *cipher_list;
369 bool cipher_server_preference;
370 char const *check_cert_issuer;
372 bool session_cache_enable;
373 uint32_t session_timeout;
374 uint32_t session_cache_size;
375 char const *session_id_name;
376 char const *session_cache_path;
377 char session_context_id[SSL_MAX_SSL_SESSION_ID_LENGTH];
378 time_t session_last_flushed;
380 bool verify_skip_if_ocsp_ok;
381 char const *verify_tmp_dir;
382 char const *verify_client_cert_cmd;
383 bool require_client_cert;
385 #ifdef HAVE_OPENSSL_OCSP_H
390 bool ocsp_override_url;
391 char const *ocsp_url;
393 X509_STORE *ocsp_store;
394 uint32_t ocsp_timeout;
398 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
399 #ifndef OPENSSL_NO_ECDH
400 char const *ecdh_curve;
404 #ifdef PSK_MAX_IDENTITY_LEN
405 char const *psk_identity;
406 char const *psk_password;
407 char const *psk_query;
416 #endif /* WITH_TLS */
417 #endif /* FR_TLS_H */