1: /*
2: * Copyright (c) 2007, Cameron Rich
3: *
4: * All rights reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions are met:
8: *
9: * * Redistributions of source code must retain the above copyright notice,
10: * this list of conditions and the following disclaimer.
11: * * Redistributions in binary form must reproduce the above copyright notice,
12: * this list of conditions and the following disclaimer in the documentation
13: * and/or other materials provided with the distribution.
14: * * Neither the name of the axTLS project nor the names of its contributors
15: * may be used to endorse or promote products derived from this software
16: * without specific prior written permission.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
22: * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
25: * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
26: * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
27: * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28: * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29: */
30:
31: /**
32: * @mainpage axTLS API
33: *
34: * @image html axolotl.jpg
35: *
36: * The axTLS library has features such as:
37: * - The TLSv1 SSL client/server protocol
38: * - No requirement to use any openssl libraries.
39: * - A choice between AES block (128/256 bit) and RC4 (128 bit) stream ciphers.
40: * - RSA encryption/decryption with variable sized keys (up to 4096 bits).
41: * - Certificate chaining and peer authentication.
42: * - Session resumption, session renegotiation.
43: * - ASN.1, X.509, PKCS#8, PKCS#12 keys/certificates with DER/PEM encoding.
44: * - Highly configurable compile time options.
45: * - Portable across many platforms (written in ANSI C), and has language
46: * bindings in C, C#, VB.NET, Java, Perl and Lua.
47: * - Partial openssl API compatibility (via a wrapper).
48: * - A very small footprint (around 50-60kB for the library in 'server-only'
49: * mode).
50: * - No dependencies on sockets - can use serial connections for example.
51: * - A very simple API - ~ 20 functions/methods.
52: *
53: * A list of these functions/methods are described below.
54: *
55: * @ref c_api
56: *
57: * @ref bigint_api
58: *
59: * @ref csharp_api
60: *
61: * @ref java_api
62: */
63: #ifndef HEADER_SSL_H
64: #define HEADER_SSL_H
65:
66: #ifdef __cplusplus
67: extern "C" {
68: #endif
69:
70: #include <time.h>
71:
72: /* need to predefine before ssl_lib.h gets to it */
73: #define SSL_SESSION_ID_SIZE 32
74:
75: #include "tls1.h"
76:
77: /* The optional parameters that can be given to the client/server SSL engine */
78: #define SSL_CLIENT_AUTHENTICATION 0x00010000
79: #define SSL_SERVER_VERIFY_LATER 0x00020000
80: #define SSL_NO_DEFAULT_KEY 0x00040000
81: #define SSL_DISPLAY_STATES 0x00080000
82: #define SSL_DISPLAY_BYTES 0x00100000
83: #define SSL_DISPLAY_CERTS 0x00200000
84: #define SSL_DISPLAY_RSA 0x00400000
85: #define SSL_CONNECT_IN_PARTS 0x00800000
86:
87: /* errors that can be generated */
88: #define SSL_OK 0
89: #define SSL_NOT_OK -1
90: #define SSL_ERROR_DEAD -2
91: #define SSL_CLOSE_NOTIFY -3
92: #define SSL_ERROR_CONN_LOST -256
93: #define SSL_ERROR_SOCK_SETUP_FAILURE -258
94: #define SSL_ERROR_INVALID_HANDSHAKE -260
95: #define SSL_ERROR_INVALID_PROT_MSG -261
96: #define SSL_ERROR_INVALID_HMAC -262
97: #define SSL_ERROR_INVALID_VERSION -263
98: #define SSL_ERROR_INVALID_SESSION -265
99: #define SSL_ERROR_NO_CIPHER -266
100: #define SSL_ERROR_BAD_CERTIFICATE -268
101: #define SSL_ERROR_INVALID_KEY -269
102: #define SSL_ERROR_FINISHED_INVALID -271
103: #define SSL_ERROR_NO_CERT_DEFINED -272
104: #define SSL_ERROR_NO_CLIENT_RENOG -273
105: #define SSL_ERROR_NOT_SUPPORTED -274
106: #define SSL_X509_OFFSET -512
107: #define SSL_X509_ERROR(A) (SSL_X509_OFFSET+A)
108:
109: /* alert types that are recognized */
110: #define SSL_ALERT_TYPE_WARNING 1
111: #define SLL_ALERT_TYPE_FATAL 2
112:
113: /* these are all the alerts that are recognized */
114: #define SSL_ALERT_CLOSE_NOTIFY 0
115: #define SSL_ALERT_UNEXPECTED_MESSAGE 10
116: #define SSL_ALERT_BAD_RECORD_MAC 20
117: #define SSL_ALERT_HANDSHAKE_FAILURE 40
118: #define SSL_ALERT_BAD_CERTIFICATE 42
119: #define SSL_ALERT_ILLEGAL_PARAMETER 47
120: #define SSL_ALERT_DECODE_ERROR 50
121: #define SSL_ALERT_DECRYPT_ERROR 51
122: #define SSL_ALERT_INVALID_VERSION 70
123: #define SSL_ALERT_NO_RENEGOTIATION 100
124:
125: /* The ciphers that are supported */
126: #define SSL_AES128_SHA 0x2f
127: #define SSL_AES256_SHA 0x35
128: #define SSL_RC4_128_SHA 0x05
129: #define SSL_RC4_128_MD5 0x04
130:
131: /* build mode ids' */
132: #define SSL_BUILD_SKELETON_MODE 0x01
133: #define SSL_BUILD_SERVER_ONLY 0x02
134: #define SSL_BUILD_ENABLE_VERIFICATION 0x03
135: #define SSL_BUILD_ENABLE_CLIENT 0x04
136: #define SSL_BUILD_FULL_MODE 0x05
137:
138: /* offsets to retrieve configuration information */
139: #define SSL_BUILD_MODE 0
140: #define SSL_MAX_CERT_CFG_OFFSET 1
141: #define SSL_MAX_CA_CERT_CFG_OFFSET 2
142: #define SSL_HAS_PEM 3
143:
144: /* default session sizes */
145: #define SSL_DEFAULT_SVR_SESS 5
146: #define SSL_DEFAULT_CLNT_SESS 1
147:
148: /* X.509/X.520 distinguished name types */
149: #define SSL_X509_CERT_COMMON_NAME 0
150: #define SSL_X509_CERT_ORGANIZATION 1
151: #define SSL_X509_CERT_ORGANIZATIONAL_NAME 2
152: #define SSL_X509_CA_CERT_COMMON_NAME 3
153: #define SSL_X509_CA_CERT_ORGANIZATION 4
154: #define SSL_X509_CA_CERT_ORGANIZATIONAL_NAME 5
155:
156: /* SSL object loader types */
157: #define SSL_OBJ_X509_CERT 1
158: #define SSL_OBJ_X509_CACERT 2
159: #define SSL_OBJ_RSA_KEY 3
160: #define SSL_OBJ_PKCS8 4
161: #define SSL_OBJ_PKCS12 5
162:
163: /**
164: * @defgroup c_api Standard C API
165: * @brief The standard interface in C.
166: * @{
167: */
168:
169: /**
170: * @brief Establish a new client/server context.
171: *
172: * This function is called before any client/server SSL connections are made.
173: *
174: * Each new connection will use the this context's private key and
175: * certificate chain. If a different certificate chain is required, then a
176: * different context needs to be be used.
177: *
178: * There are two threading models supported - a single thread with one
179: * SSL_CTX can support any number of SSL connections - and multiple threads can
180: * support one SSL_CTX object each (the default). But if a single SSL_CTX
181: * object uses many SSL objects in individual threads, then the
182: * CONFIG_SSL_CTX_MUTEXING option needs to be configured.
183: *
184: * @param options [in] Any particular options. At present the options
185: * supported are:
186: * - SSL_SERVER_VERIFY_LATER (client only): Don't stop a handshake if the server
187: * authentication fails. The certificate can be authenticated later with a
188: * call to ssl_verify_cert().
189: * - SSL_CLIENT_AUTHENTICATION (server only): Enforce client authentication
190: * i.e. each handshake will include a "certificate request" message from the
191: * server. Only available if verification has been enabled.
192: * - SSL_DISPLAY_BYTES (full mode build only): Display the byte sequences
193: * during the handshake.
194: * - SSL_DISPLAY_STATES (full mode build only): Display the state changes
195: * during the handshake.
196: * - SSL_DISPLAY_CERTS (full mode build only): Display the certificates that
197: * are passed during a handshake.
198: * - SSL_DISPLAY_RSA (full mode build only): Display the RSA key details that
199: * are passed during a handshake.
200: * - SSL_CONNECT_IN_PARTS (client only): To use a non-blocking version of
201: * ssl_client_new().
202: * @param num_sessions [in] The number of sessions to be used for session
203: * caching. If this value is 0, then there is no session caching. This option
204: * is not used in skeleton mode.
205: * @return A client/server context.
206: */
207: EXP_FUNC SSL_CTX * STDCALL ssl_ctx_new(uint32_t options, int num_sessions);
208:
209: /**
210: * @brief Remove a client/server context.
211: *
212: * Frees any used resources used by this context. Each connection will be
213: * sent a "Close Notify" alert (if possible).
214: * @param ssl_ctx [in] The client/server context.
215: */
216: EXP_FUNC void STDCALL ssl_ctx_free(SSL_CTX *ssl_ctx);
217:
218: /**
219: * @brief (server only) Establish a new SSL connection to an SSL client.
220: *
221: * It is up to the application to establish the logical connection (whether it
222: * is a socket, serial connection etc).
223: * @param ssl_ctx [in] The server context.
224: * @param client_fd [in] The client's file descriptor.
225: * @return An SSL object reference.
226: */
227: EXP_FUNC SSL * STDCALL ssl_server_new(SSL_CTX *ssl_ctx, int client_fd);
228:
229: /**
230: * @brief (client only) Establish a new SSL connection to an SSL server.
231: *
232: * It is up to the application to establish the initial logical connection
233: * (whether it is a socket, serial connection etc).
234: *
235: * This is a normally a blocking call - it will finish when the handshake is
236: * complete (or has failed). To use in non-blocking mode, set
237: * SSL_CONNECT_IN_PARTS in ssl_ctx_new().
238: * @param ssl_ctx [in] The client context.
239: * @param client_fd [in] The client's file descriptor.
240: * @param session_id [in] A 32 byte session id for session resumption. This
241: * can be null if no session resumption is being used or required. This option
242: * is not used in skeleton mode.
243: * @param sess_id_size The size of the session id (max 32)
244: * @return An SSL object reference. Use ssl_handshake_status() to check
245: * if a handshake succeeded.
246: */
247: EXP_FUNC SSL * STDCALL ssl_client_new(SSL_CTX *ssl_ctx, int client_fd, const uint8_t *session_id, uint8_t sess_id_size);
248:
249: /**
250: * @brief Free any used resources on this connection.
251:
252: * A "Close Notify" message is sent on this connection (if possible). It is up
253: * to the application to close the socket or file descriptor.
254: * @param ssl [in] The ssl object reference.
255: */
256: EXP_FUNC void STDCALL ssl_free(SSL *ssl);
257:
258: /**
259: * @brief Read the SSL data stream.
260: * If the socket is non-blocking and data is blocked then SSO_OK will be
261: * returned.
262: * @param ssl [in] An SSL object reference.
263: * @param in_data [out] If the read was successful, a pointer to the read
264: * buffer will be here. Do NOT ever free this memory as this buffer is used in
265: * sucessive calls. If the call was unsuccessful, this value will be null.
266: * @return The number of decrypted bytes:
267: * - if > 0, then the handshaking is complete and we are returning the number
268: * of decrypted bytes.
269: * - SSL_OK if the handshaking stage is successful (but not yet complete).
270: * - < 0 if an error.
271: * @see ssl.h for the error code list.
272: * @note Use in_data before doing any successive ssl calls.
273: */
274: EXP_FUNC int STDCALL ssl_read(SSL *ssl, uint8_t **in_data);
275:
276: /**
277: * @brief Write to the SSL data stream.
278: * if the socket is non-blocking and data is blocked then a check is made
279: * to ensure that all data is sent (i.e. blocked mode is forced).
280: * @param ssl [in] An SSL obect reference.
281: * @param out_data [in] The data to be written
282: * @param out_len [in] The number of bytes to be written.
283: * @return The number of bytes sent, or if < 0 if an error.
284: * @see ssl.h for the error code list.
285: */
286: EXP_FUNC int STDCALL ssl_write(SSL *ssl, const uint8_t *out_data, int out_len);
287:
288: /**
289: * @brief Find an ssl object based on a file descriptor.
290: *
291: * Goes through the list of SSL objects maintained in a client/server context
292: * to look for a file descriptor match.
293: * @param ssl_ctx [in] The client/server context.
294: * @param client_fd [in] The file descriptor.
295: * @return A reference to the SSL object. Returns null if the object could not
296: * be found.
297: */
298: EXP_FUNC SSL * STDCALL ssl_find(SSL_CTX *ssl_ctx, int client_fd);
299:
300: /**
301: * @brief Get the session id for a handshake.
302: *
303: * This will be a 32 byte sequence and is available after the first
304: * handshaking messages are sent.
305: * @param ssl [in] An SSL object reference.
306: * @return The session id as a 32 byte sequence.
307: * @note A SSLv23 handshake may have only 16 valid bytes.
308: */
309: EXP_FUNC const uint8_t * STDCALL ssl_get_session_id(const SSL *ssl);
310:
311: /**
312: * @brief Get the session id size for a handshake.
313: *
314: * This will normally be 32 but could be 0 (no session id) or something else.
315: * @param ssl [in] An SSL object reference.
316: * @return The size of the session id.
317: */
318: EXP_FUNC uint8_t STDCALL ssl_get_session_id_size(const SSL *ssl);
319:
320: /**
321: * @brief Return the cipher id (in the SSL form).
322: * @param ssl [in] An SSL object reference.
323: * @return The cipher id. This will be one of the following:
324: * - SSL_AES128_SHA (0x2f)
325: * - SSL_AES256_SHA (0x35)
326: * - SSL_RC4_128_SHA (0x05)
327: * - SSL_RC4_128_MD5 (0x04)
328: */
329: EXP_FUNC uint8_t STDCALL ssl_get_cipher_id(const SSL *ssl);
330:
331: /**
332: * @brief Return the status of the handshake.
333: * @param ssl [in] An SSL object reference.
334: * @return SSL_OK if the handshake is complete and ok.
335: * @see ssl.h for the error code list.
336: */
337: EXP_FUNC int STDCALL ssl_handshake_status(const SSL *ssl);
338:
339: /**
340: * @brief Retrieve various parameters about the axTLS engine.
341: * @param offset [in] The configuration offset. It will be one of the following:
342: * - SSL_BUILD_MODE The build mode. This will be one of the following:
343: * - SSL_BUILD_SERVER_ONLY (basic server mode)
344: * - SSL_BUILD_ENABLE_VERIFICATION (server can do client authentication)
345: * - SSL_BUILD_ENABLE_CLIENT (client/server capabilties)
346: * - SSL_BUILD_FULL_MODE (client/server with diagnostics)
347: * - SSL_BUILD_SKELETON_MODE (skeleton mode)
348: * - SSL_MAX_CERT_CFG_OFFSET The maximum number of certificates allowed.
349: * - SSL_MAX_CA_CERT_CFG_OFFSET The maximum number of CA certificates allowed.
350: * - SSL_HAS_PEM 1 if supported
351: * @return The value of the requested parameter.
352: */
353: EXP_FUNC int STDCALL ssl_get_config(int offset);
354:
355: /**
356: * @brief Display why the handshake failed.
357: *
358: * This call is only useful in a 'full mode' build. The output is to stdout.
359: * @param error_code [in] An error code.
360: * @see ssl.h for the error code list.
361: */
362: EXP_FUNC void STDCALL ssl_display_error(int error_code);
363:
364: /**
365: * @brief Authenticate a received certificate.
366: *
367: * This call is usually made by a client after a handshake is complete and the
368: * context is in SSL_SERVER_VERIFY_LATER mode.
369: * @param ssl [in] An SSL object reference.
370: * @return SSL_OK if the certificate is verified.
371: */
372: EXP_FUNC int STDCALL ssl_verify_cert(const SSL *ssl);
373:
374: /**
375: * @brief Retrieve an X.509 distinguished name component.
376: *
377: * When a handshake is complete and a certificate has been exchanged, then the
378: * details of the remote certificate can be retrieved.
379: *
380: * This will usually be used by a client to check that the server's common
381: * name matches the URL.
382: *
383: * @param ssl [in] An SSL object reference.
384: * @param component [in] one of:
385: * - SSL_X509_CERT_COMMON_NAME
386: * - SSL_X509_CERT_ORGANIZATION
387: * - SSL_X509_CERT_ORGANIZATIONAL_NAME
388: * - SSL_X509_CA_CERT_COMMON_NAME
389: * - SSL_X509_CA_CERT_ORGANIZATION
390: * - SSL_X509_CA_CERT_ORGANIZATIONAL_NAME
391: * @return The appropriate string (or null if not defined)
392: * @note Verification build mode must be enabled.
393: */
394: EXP_FUNC const char * STDCALL ssl_get_cert_dn(const SSL *ssl, int component);
395:
396: /**
397: * @brief Retrieve a Subject Alternative DNSName
398: *
399: * When a handshake is complete and a certificate has been exchanged, then the
400: * details of the remote certificate can be retrieved.
401: *
402: * This will usually be used by a client to check that the server's DNS
403: * name matches the URL.
404: *
405: * @param ssl [in] An SSL object reference.
406: * @param dnsindex [in] The index of the DNS name to retrieve.
407: * @return The appropriate string (or null if not defined)
408: * @note Verification build mode must be enabled.
409: */
410: EXP_FUNC const char * STDCALL ssl_get_cert_subject_alt_dnsname(const SSL *ssl, int dnsindex);
411:
412: /**
413: * @brief Force the client to perform its handshake again.
414: *
415: * For a client this involves sending another "client hello" message.
416: * For the server is means sending a "hello request" message.
417: *
418: * This is a blocking call on the client (until the handshake completes).
419: *
420: * @param ssl [in] An SSL object reference.
421: * @return SSL_OK if renegotiation instantiation was ok
422: */
423: EXP_FUNC int STDCALL ssl_renegotiate(SSL *ssl);
424:
425: /**
426: * @brief Process a file that is in binary DER or ASCII PEM format.
427: *
428: * These are temporary objects that are used to load private keys,
429: * certificates etc into memory.
430: * @param ssl_ctx [in] The client/server context.
431: * @param obj_type [in] The format of the file. Can be one of:
432: * - SSL_OBJ_X509_CERT (no password required)
433: * - SSL_OBJ_X509_CACERT (no password required)
434: * - SSL_OBJ_RSA_KEY (AES128/AES256 PEM encryption supported)
435: * - SSL_OBJ_PKCS8 (RC4-128 encrypted data supported)
436: * - SSL_OBJ_PKCS12 (RC4-128 encrypted data supported)
437: *
438: * PEM files are automatically detected (if supported). The object type is
439: * also detected, and so is not relevant for these types of files.
440: * @param filename [in] The location of a file in DER/PEM format.
441: * @param password [in] The password used. Can be null if not required.
442: * @return SSL_OK if all ok
443: * @note Not available in skeleton build mode.
444: */
445: EXP_FUNC int STDCALL ssl_obj_load(SSL_CTX *ssl_ctx, int obj_type, const char *filename, const char *password);
446:
447: /**
448: * @brief Process binary data.
449: *
450: * These are temporary objects that are used to load private keys,
451: * certificates etc into memory.
452: * @param ssl_ctx [in] The client/server context.
453: * @param obj_type [in] The format of the memory data.
454: * @param data [in] The binary data to be loaded.
455: * @param len [in] The amount of data to be loaded.
456: * @param password [in] The password used. Can be null if not required.
457: * @return SSL_OK if all ok
458: * @see ssl_obj_load for more details on obj_type.
459: */
460: EXP_FUNC int STDCALL ssl_obj_memory_load(SSL_CTX *ssl_ctx, int obj_type, const uint8_t *data, int len, const char *password);
461:
462: #ifdef CONFIG_SSL_GENERATE_X509_CERT
463: /**
464: * @brief Create an X.509 certificate.
465: *
466: * This certificate is a self-signed v1 cert with a fixed start/stop validity
467: * times. It is signed with an internal private key in ssl_ctx.
468: *
469: * @param ssl_ctx [in] The client/server context.
470: * @param options [in] Not used yet.
471: * @param dn [in] An array of distinguished name strings. The array is defined
472: * by:
473: * - SSL_X509_CERT_COMMON_NAME (0)
474: * - If SSL_X509_CERT_COMMON_NAME is empty or not defined, then the
475: * hostname will be used.
476: * - SSL_X509_CERT_ORGANIZATION (1)
477: * - If SSL_X509_CERT_ORGANIZATION is empty or not defined, then $USERNAME
478: * will be used.
479: * - SSL_X509_CERT_ORGANIZATIONAL_NAME (2)
480: * - SSL_X509_CERT_ORGANIZATIONAL_NAME is optional.
481: * @param cert_data [out] The certificate as a sequence of bytes.
482: * @return < 0 if an error, or the size of the certificate in bytes.
483: * @note cert_data must be freed when there is no more need for it.
484: */
485: EXP_FUNC int STDCALL ssl_x509_create(SSL_CTX *ssl_ctx, uint32_t options, const char * dn[], uint8_t **cert_data);
486: #endif
487:
488: /**
489: * @brief Return the axTLS library version as a string.
490: */
491: EXP_FUNC const char * STDCALL ssl_version(void);
492:
493: /** @} */
494:
495: #ifdef __cplusplus
496: }
497: #endif
498:
499: #endif
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