2 *****************************************************************************
6 * Author: Damien S. Stuart
8 * Purpose: Header for libfko.
10 * Copyright 2009-2010 Damien Stuart (dstuart@dstuart.org)
12 * License (GNU Public License):
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version 2
17 * of the License, or (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
29 *****************************************************************************
42 #define DLL_API __declspec(dllexport)
45 #define DLL_API __declspec(dllimport)
56 #define FKO_PROTOCOL_VERSION "2.5.0" /* The fwknop protocol version */
58 /* Supported FKO Message types...
64 FKO_CLIENT_TIMEOUT_ACCESS_MSG,
65 FKO_CLIENT_TIMEOUT_NAT_ACCESS_MSG,
66 FKO_LOCAL_NAT_ACCESS_MSG,
67 FKO_CLIENT_TIMEOUT_LOCAL_NAT_ACCESS_MSG,
68 FKO_LAST_MSG_TYPE /* Always leave this as the last one */
71 /* Supported digest types...
74 FKO_DIGEST_INVALID_DATA = -1,
75 FKO_DIGEST_UNKNOWN = 0,
81 FKO_LAST_DIGEST_TYPE /* Always leave this as the last one */
84 /* Supported hmac digest types...
87 FKO_HMAC_INVALID_DATA = -1,
94 FKO_LAST_HMAC_MODE /* Always leave this as the last one */
97 /* Supported encryption types...
100 FKO_ENCRYPTION_INVALID_DATA = -1,
101 FKO_ENCRYPTION_UNKNOWN = 0,
102 FKO_ENCRYPTION_RIJNDAEL,
104 FKO_LAST_ENCRYPTION_TYPE /* Always leave this as the last one */
105 } fko_encryption_type_t;
107 /* Symmetric encryption modes to correspond to rijndael.h
110 FKO_ENC_MODE_UNKNOWN = 0,
117 FKO_ENC_MODE_ASYMMETRIC, /* placeholder when GPG is used */
118 FKO_ENC_MODE_CBC_LEGACY_IV, /* for the old zero-padding strategy */
119 FKO_LAST_ENC_MODE /* Always leave this as the last one */
120 } fko_encryption_mode_t;
124 * Note: If you change this list in any way, please be sure to make the
125 * appropriate corresponding change to the error message list in
130 FKO_ERROR_CTX_NOT_INITIALIZED,
131 FKO_ERROR_MEMORY_ALLOCATION,
132 FKO_ERROR_FILESYSTEM_OPERATION,
133 FKO_ERROR_INVALID_DATA,
134 FKO_ERROR_DATA_TOO_LARGE,
135 FKO_ERROR_INVALID_KEY_LEN,
136 FKO_ERROR_USERNAME_UNKNOWN,
137 FKO_ERROR_INCOMPLETE_SPA_DATA,
138 FKO_ERROR_MISSING_ENCODED_DATA,
139 FKO_ERROR_INVALID_DIGEST_TYPE,
140 FKO_ERROR_INVALID_ALLOW_IP,
141 FKO_ERROR_INVALID_SPA_COMMAND_MSG,
142 FKO_ERROR_INVALID_SPA_ACCESS_MSG,
143 FKO_ERROR_INVALID_SPA_NAT_ACCESS_MSG,
144 FKO_ERROR_INVALID_ENCRYPTION_TYPE,
145 FKO_ERROR_WRONG_ENCRYPTION_TYPE,
146 FKO_ERROR_DECRYPTION_SIZE,
147 FKO_ERROR_DECRYPTION_FAILURE,
148 FKO_ERROR_DIGEST_VERIFICATION_FAILED,
149 FKO_ERROR_INVALID_HMAC_KEY_LEN,
150 FKO_ERROR_UNSUPPORTED_HMAC_MODE,
151 FKO_ERROR_UNSUPPORTED_FEATURE,
154 /* Start GPGME-related errors */
156 FKO_ERROR_MISSING_GPG_KEY_DATA,
157 FKO_ERROR_GPGME_NO_OPENPGP,
158 FKO_ERROR_GPGME_CONTEXT,
159 FKO_ERROR_GPGME_PLAINTEXT_DATA_OBJ,
160 FKO_ERROR_GPGME_SET_PROTOCOL,
161 FKO_ERROR_GPGME_CIPHER_DATA_OBJ,
162 FKO_ERROR_GPGME_BAD_PASSPHRASE,
163 FKO_ERROR_GPGME_ENCRYPT_SIGN,
164 FKO_ERROR_GPGME_CONTEXT_SIGNER_KEY,
165 FKO_ERROR_GPGME_SIGNER_KEYLIST_START,
166 FKO_ERROR_GPGME_SIGNER_KEY_NOT_FOUND,
167 FKO_ERROR_GPGME_SIGNER_KEY_AMBIGUOUS,
168 FKO_ERROR_GPGME_ADD_SIGNER,
169 FKO_ERROR_GPGME_CONTEXT_RECIPIENT_KEY,
170 FKO_ERROR_GPGME_RECIPIENT_KEYLIST_START,
171 FKO_ERROR_GPGME_RECIPIENT_KEY_NOT_FOUND,
172 FKO_ERROR_GPGME_RECIPIENT_KEY_AMBIGUOUS,
173 FKO_ERROR_GPGME_DECRYPT_FAILED,
174 FKO_ERROR_GPGME_DECRYPT_UNSUPPORTED_ALGORITHM,
175 FKO_ERROR_GPGME_BAD_GPG_EXE,
176 FKO_ERROR_GPGME_BAD_HOME_DIR,
177 FKO_ERROR_GPGME_SET_HOME_DIR,
178 FKO_ERROR_GPGME_NO_SIGNATURE,
179 FKO_ERROR_GPGME_BAD_SIGNATURE,
180 FKO_ERROR_GPGME_SIGNATURE_VERIFY_DISABLED,
185 /* Macro that returns true if the given error code is a gpg-related error.
187 #define IS_GPG_ERROR(x) (x > GPGME_ERR_START && x < FKO_LAST_ERROR)
191 #define FKO_DEFAULT_MSG_TYPE FKO_ACCESS_MSG
192 #define FKO_DEFAULT_DIGEST FKO_DIGEST_SHA256
193 #define FKO_DEFAULT_ENCRYPTION FKO_ENCRYPTION_RIJNDAEL
194 #define FKO_DEFAULT_ENC_MODE FKO_ENC_MODE_CBC
195 #define FKO_DEFAULT_KEY_LEN 0
196 #define FKO_DEFAULT_HMAC_KEY_LEN 0
197 #define FKO_DEFAULT_HMAC_MODE FKO_HMAC_SHA256
199 /* Define the consistent prefixes or salt on some encryption schemes.
201 #define B64_RIJNDAEL_SALT "U2FsdGVkX1"
202 #define B64_RIJNDAEL_SALT_STR_LEN 10
204 #define B64_GPG_PREFIX "hQ"
205 #define B64_GPG_PREFIX_STR_LEN 2
207 /* Specify whether libfko is allowed to call exit()
209 #define EXIT_UPON_ERR 1
210 #define NO_EXIT_UPON_ERR 0
212 /* The context holds the global state and config options, as
213 * well as some intermediate results during processing. This
214 * is an opaque pointer.
217 typedef struct fko_context *fko_ctx_t;
219 /* Some gpg-specifc data types and constants.
224 FKO_GPG_NO_SIG_VERIFY_SIGS = 0x01,
225 FKO_GPG_ALLOW_BAD_SIG = 0x02,
226 FKO_GPG_NO_SIG_INFO = 0x04,
227 FKO_GPG_ALLOW_EXPIRED_SIG = 0x08,
228 FKO_GPG_ALLOW_REVOKED_SIG = 0x10
231 #define FKO_GPG_GOOD_SIGSUM 3
233 #endif /* HAVE_LIBGPGME */
235 /* Function prototypes */
239 DLL_API int fko_new(fko_ctx_t *ctx);
240 DLL_API int fko_new_with_data(fko_ctx_t *ctx, const char * const enc_msg,
241 const char * const dec_key, const int dec_key_len, int encryption_mode,
242 const char * const hmac_key, const int hmac_key_len, const int hmac_type);
243 DLL_API void fko_destroy(fko_ctx_t ctx);
244 DLL_API int fko_spa_data_final(fko_ctx_t ctx, const char * const enc_key,
245 const int enc_key_len, const char * const hmac_key, const int hmac_key_len);
248 /* Set context data functions
250 DLL_API int fko_set_rand_value(fko_ctx_t ctx, const char * const val);
251 DLL_API int fko_set_username(fko_ctx_t ctx, const char * const spoof_user);
252 DLL_API int fko_set_timestamp(fko_ctx_t ctx, const int offset);
253 DLL_API int fko_set_spa_message_type(fko_ctx_t ctx, const short msg_type);
254 DLL_API int fko_set_spa_message(fko_ctx_t ctx, const char * const msg_string);
255 DLL_API int fko_set_spa_nat_access(fko_ctx_t ctx, const char * const nat_access);
256 DLL_API int fko_set_spa_server_auth(fko_ctx_t ctx, const char * const server_auth);
257 DLL_API int fko_set_spa_client_timeout(fko_ctx_t ctx, const int timeout);
258 DLL_API int fko_set_spa_digest_type(fko_ctx_t ctx, const short digest_type);
259 DLL_API int fko_set_spa_digest(fko_ctx_t ctx);
260 DLL_API int fko_set_raw_spa_digest_type(fko_ctx_t ctx, const short raw_digest_type);
261 DLL_API int fko_set_raw_spa_digest(fko_ctx_t ctx);
262 DLL_API int fko_set_spa_encryption_type(fko_ctx_t ctx, const short encrypt_type);
263 DLL_API int fko_set_spa_encryption_mode(fko_ctx_t ctx, const int encrypt_mode);
264 DLL_API int fko_set_spa_data(fko_ctx_t ctx, const char * const enc_msg);
265 DLL_API int fko_set_spa_hmac_type(fko_ctx_t ctx, const short hmac_type);
267 /* Data processing and misc utility functions
269 DLL_API const char* fko_errstr(const int err_code);
270 DLL_API int fko_encryption_type(const char * const enc_data);
271 DLL_API int fko_key_gen(char * const key_base64, const int key_len,
272 char * const hmac_key_base64, const int hmac_ken_len,
273 const int hmac_type);
274 DLL_API int fko_base64_encode(unsigned char * const in, char * const out, int in_len);
275 DLL_API int fko_base64_decode(const char * const in, unsigned char *out);
277 DLL_API int fko_encode_spa_data(fko_ctx_t ctx);
278 DLL_API int fko_decode_spa_data(fko_ctx_t ctx);
279 DLL_API int fko_encrypt_spa_data(fko_ctx_t ctx, const char * const enc_key,
280 const int enc_key_len);
281 DLL_API int fko_decrypt_spa_data(fko_ctx_t ctx, const char * const dec_key,
282 const int dec_key_len);
283 DLL_API int fko_verify_hmac(fko_ctx_t ctx, const char * const hmac_key,
284 const int hmac_key_len);
285 DLL_API int fko_set_spa_hmac(fko_ctx_t ctx, const char * const hmac_key,
286 const int hmac_key_len);
287 DLL_API int fko_get_spa_hmac(fko_ctx_t ctx, char **enc_data);
289 DLL_API int fko_get_encoded_data(fko_ctx_t ctx, char **enc_data);
292 /* Get context data functions
294 DLL_API int fko_get_rand_value(fko_ctx_t ctx, char **rand_val);
295 DLL_API int fko_get_username(fko_ctx_t ctx, char **username);
296 DLL_API int fko_get_timestamp(fko_ctx_t ctx, time_t *ts);
297 DLL_API int fko_get_spa_message_type(fko_ctx_t ctx, short *spa_msg);
298 DLL_API int fko_get_spa_message(fko_ctx_t ctx, char **spa_message);
299 DLL_API int fko_get_spa_nat_access(fko_ctx_t ctx, char **nat_access);
300 DLL_API int fko_get_spa_server_auth(fko_ctx_t ctx, char **server_auth);
301 DLL_API int fko_get_spa_client_timeout(fko_ctx_t ctx, int *client_timeout);
302 DLL_API int fko_get_spa_digest_type(fko_ctx_t ctx, short *spa_digest_type);
303 DLL_API int fko_get_raw_spa_digest_type(fko_ctx_t ctx, short *raw_spa_digest_type);
304 DLL_API int fko_get_spa_hmac_type(fko_ctx_t ctx, short *spa_hmac_type);
305 DLL_API int fko_get_spa_digest(fko_ctx_t ctx, char **spa_digest);
306 DLL_API int fko_get_raw_spa_digest(fko_ctx_t ctx, char **raw_spa_digest);
307 DLL_API int fko_get_spa_encryption_type(fko_ctx_t ctx, short *spa_enc_type);
308 DLL_API int fko_get_spa_encryption_mode(fko_ctx_t ctx, int *spa_enc_mode);
309 DLL_API int fko_get_spa_data(fko_ctx_t ctx, char **spa_data);
311 DLL_API int fko_get_version(fko_ctx_t ctx, char **version);
313 /* GPG-related functions */
314 DLL_API int fko_set_gpg_exe(fko_ctx_t ctx, const char * const gpg_exe);
315 DLL_API int fko_get_gpg_exe(fko_ctx_t ctx, char **gpg_exe);
317 DLL_API int fko_set_gpg_recipient(fko_ctx_t ctx, const char * const recip);
318 DLL_API int fko_get_gpg_recipient(fko_ctx_t ctx, char **recip);
319 DLL_API int fko_set_gpg_signer(fko_ctx_t ctx, const char * const signer);
320 DLL_API int fko_get_gpg_signer(fko_ctx_t ctx, char **signer);
321 DLL_API int fko_set_gpg_home_dir(fko_ctx_t ctx, const char * const gpg_home_dir);
322 DLL_API int fko_get_gpg_home_dir(fko_ctx_t ctx, char **gpg_home_dir);
324 DLL_API const char* fko_gpg_errstr(fko_ctx_t ctx);
326 DLL_API int fko_set_gpg_signature_verify(fko_ctx_t ctx,
327 const unsigned char val);
328 DLL_API int fko_get_gpg_signature_verify(fko_ctx_t ctx,
329 unsigned char * const val);
330 DLL_API int fko_set_gpg_ignore_verify_error(fko_ctx_t ctx,
331 const unsigned char val);
332 DLL_API int fko_get_gpg_ignore_verify_error(fko_ctx_t ctx,
333 unsigned char * const val);
335 DLL_API int fko_get_gpg_signature_id(fko_ctx_t ctx, char **sig_id);
336 DLL_API int fko_get_gpg_signature_fpr(fko_ctx_t ctx, char **sig_fpr);
337 DLL_API int fko_get_gpg_signature_summary(fko_ctx_t ctx, int *sigsum);
338 DLL_API int fko_get_gpg_signature_status(fko_ctx_t ctx, int *sigstat);
340 DLL_API int fko_gpg_signature_id_match(fko_ctx_t ctx, const char * const id,
341 unsigned char * const result);
342 DLL_API int fko_gpg_signature_fpr_match(fko_ctx_t ctx, const char * const fpr,
343 unsigned char * const result);