9 cvar_t crypto_developer = {CVAR_SAVE, "crypto_developer", "0", "print extra info about crypto handshake"};
10 cvar_t crypto_servercpupercent = {CVAR_SAVE, "crypto_servercpupercent", "10", "allowed crypto CPU load in percent for server operation (0 = no limit, faster)"};
11 cvar_t crypto_servercpumaxtime = {CVAR_SAVE, "crypto_servercpumaxtime", "0.01", "maximum allowed crypto CPU time per frame (0 = no limit)"};
12 cvar_t crypto_servercpudebug = {CVAR_SAVE, "crypto_servercpudebug", "0", "print statistics about time usage by crypto"};
13 static double crypto_servercpu_accumulator = 0;
14 static double crypto_servercpu_lastrealtime = 0;
15 cvar_t crypto_aeslevel = {CVAR_SAVE, "crypto_aeslevel", "1", "whether to support AES encryption in authenticated connections (0 = no, 1 = supported, 2 = requested, 3 = required)"};
16 int crypto_keyfp_recommended_length;
17 static const char *crypto_idstring = NULL;
18 static char crypto_idstring_buf[512];
20 #define PROTOCOL_D0_BLIND_ID FOURCC_D0PK
21 #define PROTOCOL_VLEN (('v' << 0) | ('l' << 8) | ('e' << 16) | ('n' << 24))
23 // BEGIN stuff shared with crypto-keygen-standalone
24 #define FOURCC_D0PK (('d' << 0) | ('0' << 8) | ('p' << 16) | ('k' << 24))
25 #define FOURCC_D0SK (('d' << 0) | ('0' << 8) | ('s' << 16) | ('k' << 24))
26 #define FOURCC_D0PI (('d' << 0) | ('0' << 8) | ('p' << 16) | ('i' << 24))
27 #define FOURCC_D0SI (('d' << 0) | ('0' << 8) | ('s' << 16) | ('i' << 24))
28 #define FOURCC_D0IQ (('d' << 0) | ('0' << 8) | ('i' << 16) | ('q' << 24))
29 #define FOURCC_D0IR (('d' << 0) | ('0' << 8) | ('i' << 16) | ('r' << 24))
30 #define FOURCC_D0ER (('d' << 0) | ('0' << 8) | ('e' << 16) | ('r' << 24))
31 #define FOURCC_D0IC (('d' << 0) | ('0' << 8) | ('i' << 16) | ('c' << 24))
33 static unsigned long Crypto_LittleLong(const char *data)
36 ((unsigned char) data[0]) |
37 (((unsigned char) data[1]) << 8) |
38 (((unsigned char) data[2]) << 16) |
39 (((unsigned char) data[3]) << 24);
42 static void Crypto_UnLittleLong(char *data, unsigned long l)
45 data[1] = (l >> 8) & 0xFF;
46 data[2] = (l >> 16) & 0xFF;
47 data[3] = (l >> 24) & 0xFF;
50 static size_t Crypto_ParsePack(const char *buf, size_t len, unsigned long header, const char **lumps, size_t *lumpsize, size_t nlumps)
59 if(Crypto_LittleLong(buf) != header)
63 for(i = 0; i < nlumps; ++i)
67 lumpsize[i] = Crypto_LittleLong(&buf[pos]);
69 if(pos + lumpsize[i] > len)
77 static size_t Crypto_UnParsePack(char *buf, size_t len, unsigned long header, const char *const *lumps, const size_t *lumpsize, size_t nlumps)
86 Crypto_UnLittleLong(buf, header);
89 for(i = 0; i < nlumps; ++i)
91 if(pos + 4 + lumpsize[i] > len)
93 Crypto_UnLittleLong(&buf[pos], (unsigned long)lumpsize[i]);
95 memcpy(&buf[pos], lumps[i], lumpsize[i]);
100 // END stuff shared with xonotic-keygen
104 #ifdef LINK_TO_CRYPTO
106 #include <d0_blind_id/d0_blind_id.h>
108 #define d0_blind_id_dll 1
109 #define Crypto_OpenLibrary() true
110 #define Crypto_CloseLibrary()
112 #define qd0_blind_id_new d0_blind_id_new
113 #define qd0_blind_id_free d0_blind_id_free
114 //#define qd0_blind_id_clear d0_blind_id_clear
115 #define qd0_blind_id_copy d0_blind_id_copy
116 //#define qd0_blind_id_generate_private_key d0_blind_id_generate_private_key
117 //#define qd0_blind_id_generate_private_key_fastreject d0_blind_id_generate_private_key_fastreject
118 //#define qd0_blind_id_read_private_key d0_blind_id_read_private_key
119 #define qd0_blind_id_read_public_key d0_blind_id_read_public_key
120 //#define qd0_blind_id_write_private_key d0_blind_id_write_private_key
121 //#define qd0_blind_id_write_public_key d0_blind_id_write_public_key
122 #define qd0_blind_id_fingerprint64_public_key d0_blind_id_fingerprint64_public_key
123 //#define qd0_blind_id_generate_private_id_modulus d0_blind_id_generate_private_id_modulus
124 #define qd0_blind_id_read_private_id_modulus d0_blind_id_read_private_id_modulus
125 //#define qd0_blind_id_write_private_id_modulus d0_blind_id_write_private_id_modulus
126 #define qd0_blind_id_generate_private_id_start d0_blind_id_generate_private_id_start
127 #define qd0_blind_id_generate_private_id_request d0_blind_id_generate_private_id_request
128 //#define qd0_blind_id_answer_private_id_request d0_blind_id_answer_private_id_request
129 #define qd0_blind_id_finish_private_id_request d0_blind_id_finish_private_id_request
130 //#define qd0_blind_id_read_private_id_request_camouflage d0_blind_id_read_private_id_request_camouflage
131 //#define qd0_blind_id_write_private_id_request_camouflage d0_blind_id_write_private_id_request_camouflage
132 #define qd0_blind_id_read_private_id d0_blind_id_read_private_id
133 //#define qd0_blind_id_read_public_id d0_blind_id_read_public_id
134 #define qd0_blind_id_write_private_id d0_blind_id_write_private_id
135 //#define qd0_blind_id_write_public_id d0_blind_id_write_public_id
136 #define qd0_blind_id_authenticate_with_private_id_start d0_blind_id_authenticate_with_private_id_start
137 #define qd0_blind_id_authenticate_with_private_id_challenge d0_blind_id_authenticate_with_private_id_challenge
138 #define qd0_blind_id_authenticate_with_private_id_response d0_blind_id_authenticate_with_private_id_response
139 #define qd0_blind_id_authenticate_with_private_id_verify d0_blind_id_authenticate_with_private_id_verify
140 #define qd0_blind_id_fingerprint64_public_id d0_blind_id_fingerprint64_public_id
141 #define qd0_blind_id_sessionkey_public_id d0_blind_id_sessionkey_public_id
142 #define qd0_blind_id_INITIALIZE d0_blind_id_INITIALIZE
143 #define qd0_blind_id_SHUTDOWN d0_blind_id_SHUTDOWN
144 #define qd0_blind_id_util_sha256 d0_blind_id_util_sha256
145 #define qd0_blind_id_sign_with_private_id_sign d0_blind_id_sign_with_private_id_sign
146 #define qd0_blind_id_sign_with_private_id_sign_detached d0_blind_id_sign_with_private_id_sign_detached
147 #define qd0_blind_id_setmallocfuncs d0_blind_id_setmallocfuncs
148 #define qd0_blind_id_setmutexfuncs d0_blind_id_setmutexfuncs
149 #define qd0_blind_id_verify_public_id d0_blind_id_verify_public_id
150 #define qd0_blind_id_verify_private_id d0_blind_id_verify_private_id
154 // d0_blind_id interface
157 #define D0_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
159 #define D0_WARN_UNUSED_RESULT
163 typedef void *(d0_malloc_t)(size_t len);
164 typedef void (d0_free_t)(void *p);
165 typedef void *(d0_createmutex_t)(void);
166 typedef void (d0_destroymutex_t)(void *);
167 typedef int (d0_lockmutex_t)(void *); // zero on success
168 typedef int (d0_unlockmutex_t)(void *); // zero on success
170 typedef struct d0_blind_id_s d0_blind_id_t;
171 typedef D0_BOOL (*d0_fastreject_function) (const d0_blind_id_t *ctx, void *pass);
172 static D0_EXPORT D0_WARN_UNUSED_RESULT d0_blind_id_t *(*qd0_blind_id_new) (void);
173 static D0_EXPORT void (*qd0_blind_id_free) (d0_blind_id_t *a);
174 //static D0_EXPORT void (*qd0_blind_id_clear) (d0_blind_id_t *ctx);
175 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_copy) (d0_blind_id_t *ctx, const d0_blind_id_t *src);
176 //static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_generate_private_key) (d0_blind_id_t *ctx, int k);
177 //static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_generate_private_key_fastreject) (d0_blind_id_t *ctx, int k, d0_fastreject_function reject, void *pass);
178 //static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_read_private_key) (d0_blind_id_t *ctx, const char *inbuf, size_t inbuflen);
179 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_read_public_key) (d0_blind_id_t *ctx, const char *inbuf, size_t inbuflen);
180 //static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_write_private_key) (const d0_blind_id_t *ctx, char *outbuf, size_t *outbuflen);
181 //static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_write_public_key) (const d0_blind_id_t *ctx, char *outbuf, size_t *outbuflen);
182 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_fingerprint64_public_key) (const d0_blind_id_t *ctx, char *outbuf, size_t *outbuflen);
183 //static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_generate_private_id_modulus) (d0_blind_id_t *ctx);
184 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_read_private_id_modulus) (d0_blind_id_t *ctx, const char *inbuf, size_t inbuflen);
185 //static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_write_private_id_modulus) (const d0_blind_id_t *ctx, char *outbuf, size_t *outbuflen);
186 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_generate_private_id_start) (d0_blind_id_t *ctx);
187 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_generate_private_id_request) (d0_blind_id_t *ctx, char *outbuf, size_t *outbuflen);
188 //static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_answer_private_id_request) (const d0_blind_id_t *ctx, const char *inbuf, size_t inbuflen, char *outbuf, size_t *outbuflen);
189 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_finish_private_id_request) (d0_blind_id_t *ctx, const char *inbuf, size_t inbuflen);
190 //static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_read_private_id_request_camouflage) (d0_blind_id_t *ctx, const char *inbuf, size_t inbuflen);
191 //static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_write_private_id_request_camouflage) (const d0_blind_id_t *ctx, char *outbuf, size_t *outbuflen);
192 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_read_private_id) (d0_blind_id_t *ctx, const char *inbuf, size_t inbuflen);
193 //static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_read_public_id) (d0_blind_id_t *ctx, const char *inbuf, size_t inbuflen);
194 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_write_private_id) (const d0_blind_id_t *ctx, char *outbuf, size_t *outbuflen);
195 //static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_write_public_id) (const d0_blind_id_t *ctx, char *outbuf, size_t *outbuflen);
196 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_authenticate_with_private_id_start) (d0_blind_id_t *ctx, D0_BOOL is_first, D0_BOOL send_modulus, const char *message, size_t msglen, char *outbuf, size_t *outbuflen);
197 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_authenticate_with_private_id_challenge) (d0_blind_id_t *ctx, D0_BOOL is_first, D0_BOOL recv_modulus, const char *inbuf, size_t inbuflen, char *outbuf, size_t *outbuflen, D0_BOOL *status);
198 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_authenticate_with_private_id_response) (d0_blind_id_t *ctx, const char *inbuf, size_t inbuflen, char *outbuf, size_t *outbuflen);
199 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_authenticate_with_private_id_verify) (d0_blind_id_t *ctx, const char *inbuf, size_t inbuflen, char *msg, size_t *msglen, D0_BOOL *status);
200 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_fingerprint64_public_id) (const d0_blind_id_t *ctx, char *outbuf, size_t *outbuflen);
201 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_sessionkey_public_id) (const d0_blind_id_t *ctx, char *outbuf, size_t *outbuflen); // can only be done after successful key exchange, this performs a modpow; key length is limited by SHA_DIGESTSIZE for now; also ONLY valid after successful d0_blind_id_authenticate_with_private_id_verify/d0_blind_id_fingerprint64_public_id
202 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_INITIALIZE) (void);
203 static D0_EXPORT void (*qd0_blind_id_SHUTDOWN) (void);
204 static D0_EXPORT void (*qd0_blind_id_util_sha256) (char *out, const char *in, size_t n);
205 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_sign_with_private_id_sign) (d0_blind_id_t *ctx, D0_BOOL is_first, D0_BOOL send_modulus, const char *message, size_t msglen, char *outbuf, size_t *outbuflen);
206 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_sign_with_private_id_sign_detached) (d0_blind_id_t *ctx, D0_BOOL is_first, D0_BOOL send_modulus, const char *message, size_t msglen, char *outbuf, size_t *outbuflen);
207 static D0_EXPORT void (*qd0_blind_id_setmallocfuncs)(d0_malloc_t *m, d0_free_t *f);
208 static D0_EXPORT void (*qd0_blind_id_setmutexfuncs)(d0_createmutex_t *c, d0_destroymutex_t *d, d0_lockmutex_t *l, d0_unlockmutex_t *u);
209 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_verify_public_id)(const d0_blind_id_t *ctx, D0_BOOL *status);
210 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_verify_private_id)(const d0_blind_id_t *ctx);
211 static dllfunction_t d0_blind_id_funcs[] =
213 {"d0_blind_id_new", (void **) &qd0_blind_id_new},
214 {"d0_blind_id_free", (void **) &qd0_blind_id_free},
215 //{"d0_blind_id_clear", (void **) &qd0_blind_id_clear},
216 {"d0_blind_id_copy", (void **) &qd0_blind_id_copy},
217 //{"d0_blind_id_generate_private_key", (void **) &qd0_blind_id_generate_private_key},
218 //{"d0_blind_id_generate_private_key_fastreject", (void **) &qd0_blind_id_generate_private_key_fastreject},
219 //{"d0_blind_id_read_private_key", (void **) &qd0_blind_id_read_private_key},
220 {"d0_blind_id_read_public_key", (void **) &qd0_blind_id_read_public_key},
221 //{"d0_blind_id_write_private_key", (void **) &qd0_blind_id_write_private_key},
222 //{"d0_blind_id_write_public_key", (void **) &qd0_blind_id_write_public_key},
223 {"d0_blind_id_fingerprint64_public_key", (void **) &qd0_blind_id_fingerprint64_public_key},
224 //{"d0_blind_id_generate_private_id_modulus", (void **) &qd0_blind_id_generate_private_id_modulus},
225 {"d0_blind_id_read_private_id_modulus", (void **) &qd0_blind_id_read_private_id_modulus},
226 //{"d0_blind_id_write_private_id_modulus", (void **) &qd0_blind_id_write_private_id_modulus},
227 {"d0_blind_id_generate_private_id_start", (void **) &qd0_blind_id_generate_private_id_start},
228 {"d0_blind_id_generate_private_id_request", (void **) &qd0_blind_id_generate_private_id_request},
229 //{"d0_blind_id_answer_private_id_request", (void **) &qd0_blind_id_answer_private_id_request},
230 {"d0_blind_id_finish_private_id_request", (void **) &qd0_blind_id_finish_private_id_request},
231 //{"d0_blind_id_read_private_id_request_camouflage", (void **) &qd0_blind_id_read_private_id_request_camouflage},
232 //{"d0_blind_id_write_private_id_request_camouflage", (void **) &qd0_blind_id_write_private_id_request_camouflage},
233 {"d0_blind_id_read_private_id", (void **) &qd0_blind_id_read_private_id},
234 //{"d0_blind_id_read_public_id", (void **) &qd0_blind_id_read_public_id},
235 {"d0_blind_id_write_private_id", (void **) &qd0_blind_id_write_private_id},
236 //{"d0_blind_id_write_public_id", (void **) &qd0_blind_id_write_public_id},
237 {"d0_blind_id_authenticate_with_private_id_start", (void **) &qd0_blind_id_authenticate_with_private_id_start},
238 {"d0_blind_id_authenticate_with_private_id_challenge", (void **) &qd0_blind_id_authenticate_with_private_id_challenge},
239 {"d0_blind_id_authenticate_with_private_id_response", (void **) &qd0_blind_id_authenticate_with_private_id_response},
240 {"d0_blind_id_authenticate_with_private_id_verify", (void **) &qd0_blind_id_authenticate_with_private_id_verify},
241 {"d0_blind_id_fingerprint64_public_id", (void **) &qd0_blind_id_fingerprint64_public_id},
242 {"d0_blind_id_sessionkey_public_id", (void **) &qd0_blind_id_sessionkey_public_id},
243 {"d0_blind_id_INITIALIZE", (void **) &qd0_blind_id_INITIALIZE},
244 {"d0_blind_id_SHUTDOWN", (void **) &qd0_blind_id_SHUTDOWN},
245 {"d0_blind_id_util_sha256", (void **) &qd0_blind_id_util_sha256},
246 {"d0_blind_id_sign_with_private_id_sign", (void **) &qd0_blind_id_sign_with_private_id_sign},
247 {"d0_blind_id_sign_with_private_id_sign_detached", (void **) &qd0_blind_id_sign_with_private_id_sign_detached},
248 {"d0_blind_id_setmallocfuncs", (void **) &qd0_blind_id_setmallocfuncs},
249 {"d0_blind_id_setmutexfuncs", (void **) &qd0_blind_id_setmutexfuncs},
250 {"d0_blind_id_verify_public_id", (void **) &qd0_blind_id_verify_public_id},
251 {"d0_blind_id_verify_private_id", (void **) &qd0_blind_id_verify_private_id},
254 // end of d0_blind_id interface
256 static dllhandle_t d0_blind_id_dll = NULL;
257 static qboolean Crypto_OpenLibrary (void)
259 const char* dllnames [] =
262 "libd0_blind_id-0.dll",
263 #elif defined(MACOSX)
264 "libd0_blind_id.0.dylib",
266 "libd0_blind_id.so.0",
267 "libd0_blind_id.so", // FreeBSD
277 return Sys_LoadLibrary (dllnames, &d0_blind_id_dll, d0_blind_id_funcs);
280 static void Crypto_CloseLibrary (void)
282 Sys_UnloadLibrary (&d0_blind_id_dll);
287 #ifdef LINK_TO_CRYPTO_RIJNDAEL
289 #include <d0_blind_id/d0_rijndael.h>
291 #define d0_rijndael_dll 1
292 #define Crypto_Rijndael_OpenLibrary() true
293 #define Crypto_Rijndael_CloseLibrary()
295 #define qd0_rijndael_setup_encrypt d0_rijndael_setup_encrypt
296 #define qd0_rijndael_setup_decrypt d0_rijndael_setup_decrypt
297 #define qd0_rijndael_encrypt d0_rijndael_encrypt
298 #define qd0_rijndael_decrypt d0_rijndael_decrypt
302 // no need to do the #define dance here, as the upper part declares out macros either way
304 D0_EXPORT int (*qd0_rijndael_setup_encrypt) (unsigned long *rk, const unsigned char *key,
306 D0_EXPORT int (*qd0_rijndael_setup_decrypt) (unsigned long *rk, const unsigned char *key,
308 D0_EXPORT void (*qd0_rijndael_encrypt) (const unsigned long *rk, int nrounds,
309 const unsigned char plaintext[16], unsigned char ciphertext[16]);
310 D0_EXPORT void (*qd0_rijndael_decrypt) (const unsigned long *rk, int nrounds,
311 const unsigned char ciphertext[16], unsigned char plaintext[16]);
312 #define D0_RIJNDAEL_KEYLENGTH(keybits) ((keybits)/8)
313 #define D0_RIJNDAEL_RKLENGTH(keybits) ((keybits)/8+28)
314 #define D0_RIJNDAEL_NROUNDS(keybits) ((keybits)/32+6)
315 static dllfunction_t d0_rijndael_funcs[] =
317 {"d0_rijndael_setup_decrypt", (void **) &qd0_rijndael_setup_decrypt},
318 {"d0_rijndael_setup_encrypt", (void **) &qd0_rijndael_setup_encrypt},
319 {"d0_rijndael_decrypt", (void **) &qd0_rijndael_decrypt},
320 {"d0_rijndael_encrypt", (void **) &qd0_rijndael_encrypt},
323 // end of d0_blind_id interface
325 static dllhandle_t d0_rijndael_dll = NULL;
326 static qboolean Crypto_Rijndael_OpenLibrary (void)
328 const char* dllnames [] =
331 "libd0_rijndael-0.dll",
332 #elif defined(MACOSX)
333 "libd0_rijndael.0.dylib",
335 "libd0_rijndael.so.0",
336 "libd0_rijndael.so", // FreeBSD
346 return Sys_LoadLibrary (dllnames, &d0_rijndael_dll, d0_rijndael_funcs);
349 static void Crypto_Rijndael_CloseLibrary (void)
351 Sys_UnloadLibrary (&d0_rijndael_dll);
357 void sha256(unsigned char *out, const unsigned char *in, int n)
359 qd0_blind_id_util_sha256((char *) out, (const char *) in, n);
362 static size_t Crypto_LoadFile(const char *path, char *buf, size_t nmax, qboolean inuserdir)
368 f = FS_SysOpen(va(vabuf, sizeof(vabuf), "%s%s", *fs_userdir ? fs_userdir : fs_basedir, path), "rb", false);
370 f = FS_SysOpen(va(vabuf, sizeof(vabuf), "%s%s", fs_basedir, path), "rb", false);
373 n = FS_Read(f, buf, nmax);
380 static qboolean PutWithNul(char **data, size_t *len, const char *str)
382 // invariant: data points to insertion point
383 size_t l = strlen(str);
386 memcpy(*data, str, l+1);
392 static const char *GetUntilNul(const char **data, size_t *len)
394 // invariant: data points to next character to take
395 const char *data_save = *data;
408 p = (const char *) memchr(*data, 0, *len);
409 if(!p) // no terminating NUL
422 return (const char *) data_save;
429 static d0_blind_id_t *Crypto_ReadPublicKey(char *buf, size_t len)
431 d0_blind_id_t *pk = NULL;
434 if(Crypto_ParsePack(buf, len, FOURCC_D0PK, p, l, 2))
436 pk = qd0_blind_id_new();
438 if(qd0_blind_id_read_public_key(pk, p[0], l[0]))
439 if(qd0_blind_id_read_private_id_modulus(pk, p[1], l[1]))
443 qd0_blind_id_free(pk);
448 static qboolean Crypto_AddPrivateKey(d0_blind_id_t *pk, char *buf, size_t len)
452 if(Crypto_ParsePack(buf, len, FOURCC_D0SI, p, l, 1))
454 if(qd0_blind_id_read_private_id(pk, p[0], l[0]))
460 #define MAX_PUBKEYS 16
461 static d0_blind_id_t *pubkeys[MAX_PUBKEYS];
462 static char pubkeys_fp64[MAX_PUBKEYS][FP64_SIZE+1];
463 static qboolean pubkeys_havepriv[MAX_PUBKEYS];
464 static qboolean pubkeys_havesig[MAX_PUBKEYS];
465 static char pubkeys_priv_fp64[MAX_PUBKEYS][FP64_SIZE+1];
466 static char challenge_append[1400];
467 static size_t challenge_append_length;
469 static int keygen_i = -1;
470 static char keygen_buf[8192];
472 #define MAX_CRYPTOCONNECTS 16
473 #define CRYPTOCONNECT_NONE 0
474 #define CRYPTOCONNECT_PRECONNECT 1
475 #define CRYPTOCONNECT_CONNECT 2
476 #define CRYPTOCONNECT_RECONNECT 3
477 #define CRYPTOCONNECT_DUPLICATE 4
478 typedef struct server_cryptoconnect_s
481 lhnetaddress_t address;
485 server_cryptoconnect_t;
486 static server_cryptoconnect_t cryptoconnects[MAX_CRYPTOCONNECTS];
488 static int cdata_id = 0;
494 char challenge[2048];
495 char wantserver_idfp[FP64_SIZE+1];
496 qboolean wantserver_aes;
501 // crypto specific helpers
502 #define CDATA ((crypto_data_t *) crypto->data)
503 #define MAKE_CDATA if(!crypto->data) crypto->data = Z_Malloc(sizeof(crypto_data_t))
504 #define CLEAR_CDATA if(crypto->data) { if(CDATA->id) qd0_blind_id_free(CDATA->id); Z_Free(crypto->data); } crypto->data = NULL
506 static crypto_t *Crypto_ServerFindInstance(lhnetaddress_t *peeraddress, qboolean allow_create)
512 return NULL; // no support
514 for(i = 0; i < MAX_CRYPTOCONNECTS; ++i)
515 if(LHNETADDRESS_Compare(peeraddress, &cryptoconnects[i].address))
517 if(i < MAX_CRYPTOCONNECTS && (allow_create || cryptoconnects[i].crypto.data))
519 crypto = &cryptoconnects[i].crypto;
520 cryptoconnects[i].lasttime = realtime;
526 for(i = 1; i < MAX_CRYPTOCONNECTS; ++i)
527 if(cryptoconnects[i].lasttime < cryptoconnects[best].lasttime)
529 crypto = &cryptoconnects[best].crypto;
530 cryptoconnects[best].lasttime = realtime;
531 memcpy(&cryptoconnects[best].address, peeraddress, sizeof(cryptoconnects[best].address));
536 qboolean Crypto_FinishInstance(crypto_t *out, crypto_t *crypto)
538 // no check needed here (returned pointers are only used in prefilled fields)
539 if(!crypto || !crypto->authenticated)
541 Con_Printf("Passed an invalid crypto connect instance\n");
542 memset(out, 0, sizeof(*out));
546 memcpy(out, crypto, sizeof(*out));
547 memset(crypto, 0, sizeof(*crypto));
551 crypto_t *Crypto_ServerGetInstance(lhnetaddress_t *peeraddress)
553 // no check needed here (returned pointers are only used in prefilled fields)
554 return Crypto_ServerFindInstance(peeraddress, false);
557 typedef struct crypto_storedhostkey_s
559 struct crypto_storedhostkey_s *next;
562 char idfp[FP64_SIZE+1];
565 crypto_storedhostkey_t;
566 static crypto_storedhostkey_t *crypto_storedhostkey_hashtable[CRYPTO_HOSTKEY_HASHSIZE];
568 static void Crypto_InitHostKeys(void)
571 for(i = 0; i < CRYPTO_HOSTKEY_HASHSIZE; ++i)
572 crypto_storedhostkey_hashtable[i] = NULL;
575 static void Crypto_ClearHostKeys(void)
578 crypto_storedhostkey_t *hk, *hkn;
579 for(i = 0; i < CRYPTO_HOSTKEY_HASHSIZE; ++i)
581 for(hk = crypto_storedhostkey_hashtable[i]; hk; hk = hkn)
586 crypto_storedhostkey_hashtable[i] = NULL;
590 static qboolean Crypto_ClearHostKey(lhnetaddress_t *peeraddress)
594 crypto_storedhostkey_t **hkp;
595 qboolean found = false;
597 LHNETADDRESS_ToString(peeraddress, buf, sizeof(buf), 1);
598 hashindex = CRC_Block((const unsigned char *) buf, strlen(buf)) % CRYPTO_HOSTKEY_HASHSIZE;
599 for(hkp = &crypto_storedhostkey_hashtable[hashindex]; *hkp && LHNETADDRESS_Compare(&((*hkp)->addr), peeraddress); hkp = &((*hkp)->next));
603 crypto_storedhostkey_t *hk = *hkp;
612 static void Crypto_StoreHostKey(lhnetaddress_t *peeraddress, const char *keystring, qboolean complain)
616 crypto_storedhostkey_t *hk;
618 char idfp[FP64_SIZE+1];
624 // syntax of keystring:
625 // aeslevel id@key id@key ...
629 aeslevel = bound(0, *keystring - '0', 3);
630 while(*keystring && *keystring != ' ')
634 while(*keystring && keyid < 0)
637 const char *idstart, *idend, *keystart, *keyend;
638 ++keystring; // skip the space
640 while(*keystring && *keystring != ' ' && *keystring != '@')
646 keystart = keystring;
647 while(*keystring && *keystring != ' ')
651 if(idend - idstart == FP64_SIZE && keyend - keystart == FP64_SIZE)
653 for(keyid = MAX_PUBKEYS - 1; keyid >= 0; --keyid)
655 if(!memcmp(pubkeys_fp64[keyid], keystart, FP64_SIZE))
657 memcpy(idfp, idstart, FP64_SIZE);
661 // If this failed, keyid will be -1.
668 LHNETADDRESS_ToString(peeraddress, buf, sizeof(buf), 1);
669 hashindex = CRC_Block((const unsigned char *) buf, strlen(buf)) % CRYPTO_HOSTKEY_HASHSIZE;
670 for(hk = crypto_storedhostkey_hashtable[hashindex]; hk && LHNETADDRESS_Compare(&hk->addr, peeraddress); hk = hk->next);
676 if(hk->keyid != keyid || memcmp(hk->idfp, idfp, FP64_SIZE+1))
677 Con_Printf("Server %s tried to change the host key to a value not in the host cache. Connecting to it will fail. To accept the new host key, do crypto_hostkey_clear %s\n", buf, buf);
678 if(hk->aeslevel > aeslevel)
679 Con_Printf("Server %s tried to reduce encryption status, not accepted. Connecting to it will fail. To accept, do crypto_hostkey_clear %s\n", buf, buf);
681 hk->aeslevel = max(aeslevel, hk->aeslevel);
685 // great, we did NOT have it yet
686 hk = (crypto_storedhostkey_t *) Z_Malloc(sizeof(*hk));
687 memcpy(&hk->addr, peeraddress, sizeof(hk->addr));
689 memcpy(hk->idfp, idfp, FP64_SIZE+1);
690 hk->next = crypto_storedhostkey_hashtable[hashindex];
691 hk->aeslevel = aeslevel;
692 crypto_storedhostkey_hashtable[hashindex] = hk;
695 qboolean Crypto_RetrieveHostKey(lhnetaddress_t *peeraddress, int *keyid, char *keyfp, size_t keyfplen, char *idfp, size_t idfplen, int *aeslevel)
699 crypto_storedhostkey_t *hk;
704 LHNETADDRESS_ToString(peeraddress, buf, sizeof(buf), 1);
705 hashindex = CRC_Block((const unsigned char *) buf, strlen(buf)) % CRYPTO_HOSTKEY_HASHSIZE;
706 for(hk = crypto_storedhostkey_hashtable[hashindex]; hk && LHNETADDRESS_Compare(&hk->addr, peeraddress); hk = hk->next);
714 strlcpy(keyfp, pubkeys_fp64[hk->keyid], keyfplen);
716 strlcpy(idfp, hk->idfp, idfplen);
718 *aeslevel = hk->aeslevel;
722 int Crypto_RetrieveLocalKey(int keyid, char *keyfp, size_t keyfplen, char *idfp, size_t idfplen, qboolean *issigned) // return value: -1 if more to come, +1 if valid, 0 if end of list
724 if(keyid < 0 || keyid >= MAX_PUBKEYS)
733 strlcpy(keyfp, pubkeys_fp64[keyid], keyfplen);
735 if(pubkeys_havepriv[keyid])
736 strlcpy(idfp, pubkeys_priv_fp64[keyid], idfplen);
738 *issigned = pubkeys_havesig[keyid];
743 // init/shutdown code
744 static void Crypto_BuildChallengeAppend(void)
746 char *p, *lengthptr, *startptr;
749 p = challenge_append;
750 n = sizeof(challenge_append);
751 Crypto_UnLittleLong(p, PROTOCOL_VLEN);
755 Crypto_UnLittleLong(p, 0);
758 Crypto_UnLittleLong(p, PROTOCOL_D0_BLIND_ID);
762 for(i = 0; i < MAX_PUBKEYS; ++i)
763 if(pubkeys_havepriv[i])
764 PutWithNul(&p, &n, pubkeys_fp64[i]);
765 PutWithNul(&p, &n, "");
766 for(i = 0; i < MAX_PUBKEYS; ++i)
767 if(!pubkeys_havepriv[i] && pubkeys[i])
768 PutWithNul(&p, &n, pubkeys_fp64[i]);
769 Crypto_UnLittleLong(lengthptr, p - startptr);
770 challenge_append_length = p - challenge_append;
773 static qboolean Crypto_SavePubKeyTextFile(int i)
778 if(!pubkeys_havepriv[i])
780 f = FS_SysOpen(va(vabuf, sizeof(vabuf), "%skey_%d-public-fp%s.txt", *fs_userdir ? fs_userdir : fs_basedir, i, sessionid.string), "w", false);
784 // we ignore errors for this file, as it's not necessary to have
785 FS_Printf(f, "ID-Fingerprint: %s\n", pubkeys_priv_fp64[i]);
786 FS_Printf(f, "ID-Is-Signed: %s\n", pubkeys_havesig[i] ? "yes" : "no");
787 FS_Printf(f, "ID-Is-For-Key: %s\n", pubkeys_fp64[i]);
789 FS_Printf(f, "This is a PUBLIC ID file for DarkPlaces.\n");
790 FS_Printf(f, "You are free to share this file or its contents.\n");
792 FS_Printf(f, "This file will be automatically generated again if deleted.\n");
794 FS_Printf(f, "However, NEVER share the accompanying SECRET ID file called\n");
795 FS_Printf(f, "key_%d.d0si%s, as doing so would compromise security!\n", i, sessionid.string);
801 void Crypto_LoadKeys(void)
808 if(!d0_blind_id_dll) // don't if we can't
811 if(crypto_idstring) // already loaded? then not
814 Host_LockSession(); // we use the session ID here
817 // note: we are just a CLIENT
819 // PUBLIC KEYS to accept (including modulus)
820 // PRIVATE KEY of user
822 crypto_idstring = NULL;
823 dpsnprintf(crypto_idstring_buf, sizeof(crypto_idstring_buf), "%d", d0_rijndael_dll ? crypto_aeslevel.integer : 0);
824 for(i = 0; i < MAX_PUBKEYS; ++i)
826 memset(pubkeys_fp64[i], 0, sizeof(pubkeys_fp64[i]));
827 memset(pubkeys_priv_fp64[i], 0, sizeof(pubkeys_fp64[i]));
828 pubkeys_havepriv[i] = false;
829 pubkeys_havesig[i] = false;
830 len = Crypto_LoadFile(va(vabuf, sizeof(vabuf), "key_%d.d0pk", i), buf, sizeof(buf), false);
831 if((pubkeys[i] = Crypto_ReadPublicKey(buf, len)))
834 if(qd0_blind_id_fingerprint64_public_key(pubkeys[i], pubkeys_fp64[i], &len2)) // keeps final NUL
836 Con_Printf("Loaded public key key_%d.d0pk (fingerprint: %s)\n", i, pubkeys_fp64[i]);
837 len = Crypto_LoadFile(va(vabuf, sizeof(vabuf), "key_%d.d0si%s", i, sessionid.string), buf, sizeof(buf), true);
840 if(Crypto_AddPrivateKey(pubkeys[i], buf, len))
843 if(qd0_blind_id_fingerprint64_public_id(pubkeys[i], pubkeys_priv_fp64[i], &len2)) // keeps final NUL
847 Con_Printf("Loaded private ID key_%d.d0si%s for key_%d.d0pk (public key fingerprint: %s)\n", i, sessionid.string, i, pubkeys_priv_fp64[i]);
849 // verify the key we just loaded (just in case)
850 if(qd0_blind_id_verify_private_id(pubkeys[i]) && qd0_blind_id_verify_public_id(pubkeys[i], &status))
852 pubkeys_havepriv[i] = true;
853 strlcat(crypto_idstring_buf, va(vabuf, sizeof(vabuf), " %s@%s", pubkeys_priv_fp64[i], pubkeys_fp64[i]), sizeof(crypto_idstring_buf));
855 // verify the key we just got (just in case)
857 pubkeys_havesig[i] = true;
859 Con_Printf("NOTE: this ID has not yet been signed!\n");
861 Crypto_SavePubKeyTextFile(i);
865 Con_Printf("d0_blind_id_verify_private_id failed, this is not a valid key!\n");
866 qd0_blind_id_free(pubkeys[i]);
872 Con_Printf("d0_blind_id_fingerprint64_public_id failed\n");
873 qd0_blind_id_free(pubkeys[i]);
881 // can't really happen
882 qd0_blind_id_free(pubkeys[i]);
887 crypto_idstring = crypto_idstring_buf;
890 Crypto_BuildChallengeAppend();
892 // find a good prefix length for all the keys we know (yes, algorithm is not perfect yet, may yield too long prefix length)
893 crypto_keyfp_recommended_length = 0;
894 memset(buf+256, 0, MAX_PUBKEYS + MAX_PUBKEYS);
895 while(crypto_keyfp_recommended_length < FP64_SIZE)
898 for(i = 0; i < MAX_PUBKEYS; ++i)
902 ++buf[(unsigned char) pubkeys_fp64[i][crypto_keyfp_recommended_length]];
903 if(pubkeys_havepriv[i])
904 if(!buf[256 + MAX_PUBKEYS + i])
905 ++buf[(unsigned char) pubkeys_priv_fp64[i][crypto_keyfp_recommended_length]];
907 for(i = 0; i < MAX_PUBKEYS; ++i)
911 if(buf[(unsigned char) pubkeys_fp64[i][crypto_keyfp_recommended_length]] < 2)
913 if(pubkeys_havepriv[i])
914 if(!buf[256 + MAX_PUBKEYS + i])
915 if(buf[(unsigned char) pubkeys_priv_fp64[i][crypto_keyfp_recommended_length]] < 2)
916 buf[256 + MAX_PUBKEYS + i] = 1;
918 ++crypto_keyfp_recommended_length;
919 for(i = 0; i < MAX_PUBKEYS; ++i)
924 if(pubkeys_havepriv[i])
925 if(!buf[256 + MAX_PUBKEYS + i])
931 if(crypto_keyfp_recommended_length < 7)
932 crypto_keyfp_recommended_length = 7;
935 static void Crypto_UnloadKeys(void)
940 for(i = 0; i < MAX_PUBKEYS; ++i)
943 qd0_blind_id_free(pubkeys[i]);
945 pubkeys_havepriv[i] = false;
946 pubkeys_havesig[i] = false;
947 memset(pubkeys_fp64[i], 0, sizeof(pubkeys_fp64[i]));
948 memset(pubkeys_priv_fp64[i], 0, sizeof(pubkeys_fp64[i]));
949 challenge_append_length = 0;
951 crypto_idstring = NULL;
954 static mempool_t *cryptomempool;
960 static void *Crypto_d0_malloc(size_t len)
962 return Mem_Alloc(cryptomempool, len);
965 static void Crypto_d0_free(void *p)
970 static void *Crypto_d0_createmutex(void)
972 return Thread_CreateMutex();
975 static void Crypto_d0_destroymutex(void *m)
977 Thread_DestroyMutex(m);
980 static int Crypto_d0_lockmutex(void *m)
982 return Thread_LockMutex(m);
985 static int Crypto_d0_unlockmutex(void *m)
987 return Thread_UnlockMutex(m);
993 void Crypto_Shutdown(void)
998 Crypto_Rijndael_CloseLibrary();
1003 for(i = 0; i < MAX_CRYPTOCONNECTS; ++i)
1005 crypto = &cryptoconnects[i].crypto;
1008 memset(cryptoconnects, 0, sizeof(cryptoconnects));
1009 crypto = &cls.crypto;
1012 Crypto_UnloadKeys();
1014 qd0_blind_id_SHUTDOWN();
1016 Crypto_CloseLibrary();
1019 Mem_FreePool(&cryptomempool);
1022 void Crypto_Init(void)
1024 cryptomempool = Mem_AllocPool("crypto", 0, NULL);
1026 if(!Crypto_OpenLibrary())
1029 qd0_blind_id_setmallocfuncs(Crypto_d0_malloc, Crypto_d0_free);
1030 if (Thread_HasThreads())
1031 qd0_blind_id_setmutexfuncs(Crypto_d0_createmutex, Crypto_d0_destroymutex, Crypto_d0_lockmutex, Crypto_d0_unlockmutex);
1033 if(!qd0_blind_id_INITIALIZE())
1035 Crypto_Rijndael_CloseLibrary();
1036 Crypto_CloseLibrary();
1037 Con_Printf("libd0_blind_id initialization FAILED, cryptography support has been disabled\n");
1041 (void) Crypto_Rijndael_OpenLibrary(); // if this fails, it's uncritical
1043 Crypto_InitHostKeys();
1047 qboolean Crypto_Available(void)
1049 if(!d0_blind_id_dll)
1055 static void Crypto_KeyGen_Finished(int code, size_t length_received, unsigned char *buffer, void *cbdata)
1059 static char buf[8192];
1060 static char buf2[8192];
1066 SV_LockThreadMutex();
1068 if(!d0_blind_id_dll)
1070 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1072 SV_UnlockThreadMutex();
1076 if(keygen_i >= MAX_PUBKEYS || !pubkeys[keygen_i])
1078 Con_Printf("overflow of keygen_i\n");
1080 SV_UnlockThreadMutex();
1085 Con_Printf("Unexpected response from keygen server:\n");
1086 Com_HexDumpToConsole(buffer, (int)length_received);
1087 SV_UnlockThreadMutex();
1090 if(!Crypto_ParsePack((const char *) buffer, length_received, FOURCC_D0IR, p, l, 1))
1092 if(length_received >= 5 && Crypto_LittleLong((const char *) buffer) == FOURCC_D0ER)
1094 Con_Printf("Error response from keygen server: %.*s\n", (int)(length_received - 5), buffer + 5);
1098 Con_Printf("Invalid response from keygen server:\n");
1099 Com_HexDumpToConsole(buffer, (int)length_received);
1102 SV_UnlockThreadMutex();
1105 if(!qd0_blind_id_finish_private_id_request(pubkeys[keygen_i], p[0], l[0]))
1107 Con_Printf("d0_blind_id_finish_private_id_request failed\n");
1109 SV_UnlockThreadMutex();
1113 // verify the key we just got (just in case)
1114 if(!qd0_blind_id_verify_public_id(pubkeys[keygen_i], &status) || !status)
1116 Con_Printf("d0_blind_id_verify_public_id failed\n");
1118 SV_UnlockThreadMutex();
1122 // we have a valid key now!
1123 // make the rest of crypto.c know that
1124 Con_Printf("Received signature for private ID key_%d.d0pk (public key fingerprint: %s)\n", keygen_i, pubkeys_priv_fp64[keygen_i]);
1125 pubkeys_havesig[keygen_i] = true;
1127 // write the key to disk
1130 if(!qd0_blind_id_write_private_id(pubkeys[keygen_i], buf, &l[0]))
1132 Con_Printf("d0_blind_id_write_private_id failed\n");
1134 SV_UnlockThreadMutex();
1137 if(!(buf2size = Crypto_UnParsePack(buf2, sizeof(buf2), FOURCC_D0SI, p, l, 1)))
1139 Con_Printf("Crypto_UnParsePack failed\n");
1141 SV_UnlockThreadMutex();
1145 FS_CreatePath(va(vabuf, sizeof(vabuf), "%skey_%d.d0si%s", *fs_userdir ? fs_userdir : fs_basedir, keygen_i, sessionid.string));
1146 f = FS_SysOpen(va(vabuf, sizeof(vabuf), "%skey_%d.d0si%s", *fs_userdir ? fs_userdir : fs_basedir, keygen_i, sessionid.string), "wb", false);
1149 Con_Printf("Cannot open key_%d.d0si%s\n", keygen_i, sessionid.string);
1151 SV_UnlockThreadMutex();
1154 FS_Write(f, buf2, buf2size);
1157 Crypto_SavePubKeyTextFile(keygen_i);
1159 Con_Printf("Saved to key_%d.d0si%s\n", keygen_i, sessionid.string);
1162 SV_UnlockThreadMutex();
1165 static void Crypto_KeyGen_f(void)
1170 static char buf[8192];
1171 static char buf2[8192];
1173 size_t buf2l, buf2pos;
1178 if(!d0_blind_id_dll)
1180 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1185 Con_Printf("usage:\n%s id url\n", Cmd_Argv(0));
1188 SV_LockThreadMutex();
1190 i = atoi(Cmd_Argv(1));
1193 Con_Printf("there is no public key %d\n", i);
1194 SV_UnlockThreadMutex();
1199 Con_Printf("there is already a keygen run on the way\n");
1200 SV_UnlockThreadMutex();
1205 // how to START the keygenning...
1206 if(pubkeys_havepriv[keygen_i])
1208 if(pubkeys_havesig[keygen_i])
1210 Con_Printf("there is already a signed private key for %d\n", i);
1212 SV_UnlockThreadMutex();
1215 // if we get here, we only need a signature, no new keygen run needed
1216 Con_Printf("Only need a signature for an existing key...\n");
1220 // we also need a new ID itself
1221 if(!qd0_blind_id_generate_private_id_start(pubkeys[keygen_i]))
1223 Con_Printf("d0_blind_id_start failed\n");
1225 SV_UnlockThreadMutex();
1228 // verify the key we just got (just in case)
1229 if(!qd0_blind_id_verify_private_id(pubkeys[keygen_i]))
1231 Con_Printf("d0_blind_id_verify_private_id failed\n");
1233 SV_UnlockThreadMutex();
1236 // we have a valid key now!
1237 // make the rest of crypto.c know that
1239 if(qd0_blind_id_fingerprint64_public_id(pubkeys[keygen_i], pubkeys_priv_fp64[keygen_i], &len2)) // keeps final NUL
1241 Con_Printf("Generated private ID key_%d.d0pk (public key fingerprint: %s)\n", keygen_i, pubkeys_priv_fp64[keygen_i]);
1242 pubkeys_havepriv[keygen_i] = true;
1243 strlcat(crypto_idstring_buf, va(vabuf, sizeof(vabuf), " %s@%s", pubkeys_priv_fp64[keygen_i], pubkeys_fp64[keygen_i]), sizeof(crypto_idstring_buf));
1244 crypto_idstring = crypto_idstring_buf;
1245 Crypto_BuildChallengeAppend();
1247 // write the key to disk
1250 if(!qd0_blind_id_write_private_id(pubkeys[keygen_i], buf, &l[0]))
1252 Con_Printf("d0_blind_id_write_private_id failed\n");
1254 SV_UnlockThreadMutex();
1257 if(!(buf2size = Crypto_UnParsePack(buf2, sizeof(buf2), FOURCC_D0SI, p, l, 1)))
1259 Con_Printf("Crypto_UnParsePack failed\n");
1261 SV_UnlockThreadMutex();
1265 FS_CreatePath(va(vabuf, sizeof(vabuf), "%skey_%d.d0si%s", *fs_userdir ? fs_userdir : fs_basedir, keygen_i, sessionid.string));
1266 f = FS_SysOpen(va(vabuf, sizeof(vabuf), "%skey_%d.d0si%s", *fs_userdir ? fs_userdir : fs_basedir, keygen_i, sessionid.string), "wb", false);
1269 Con_Printf("Cannot open key_%d.d0si%s\n", keygen_i, sessionid.string);
1271 SV_UnlockThreadMutex();
1274 FS_Write(f, buf2, buf2size);
1277 Crypto_SavePubKeyTextFile(keygen_i);
1279 Con_Printf("Saved unsigned key to key_%d.d0si%s\n", keygen_i, sessionid.string);
1283 if(!qd0_blind_id_generate_private_id_request(pubkeys[keygen_i], buf, &l[0]))
1285 Con_Printf("d0_blind_id_generate_private_id_request failed\n");
1287 SV_UnlockThreadMutex();
1290 buf2pos = strlen(Cmd_Argv(2));
1291 memcpy(buf2, Cmd_Argv(2), buf2pos);
1292 if(!(buf2l = Crypto_UnParsePack(buf2 + buf2pos, sizeof(buf2) - buf2pos - 1, FOURCC_D0IQ, p, l, 1)))
1294 Con_Printf("Crypto_UnParsePack failed\n");
1296 SV_UnlockThreadMutex();
1299 if(!(buf2l = base64_encode((unsigned char *) (buf2 + buf2pos), buf2l, sizeof(buf2) - buf2pos - 1)))
1301 Con_Printf("base64_encode failed\n");
1303 SV_UnlockThreadMutex();
1308 if(!Curl_Begin_ToMemory(buf2, 0, (unsigned char *) keygen_buf, sizeof(keygen_buf), Crypto_KeyGen_Finished, NULL))
1310 Con_Printf("curl failed\n");
1312 SV_UnlockThreadMutex();
1315 Con_Printf("Signature generation in progress...\n");
1316 SV_UnlockThreadMutex();
1321 static void Crypto_Reload_f(void)
1323 Crypto_ClearHostKeys();
1324 Crypto_UnloadKeys();
1328 static void Crypto_Keys_f(void)
1331 if(!d0_blind_id_dll)
1333 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1336 for(i = 0; i < MAX_PUBKEYS; ++i)
1340 Con_Printf("%2d: public key key_%d.d0pk (fingerprint: %s)\n", i, i, pubkeys_fp64[i]);
1341 if(pubkeys_havepriv[i])
1343 Con_Printf(" private ID key_%d.d0si%s (public key fingerprint: %s)\n", i, sessionid.string, pubkeys_priv_fp64[i]);
1344 if(!pubkeys_havesig[i])
1345 Con_Printf(" NOTE: this ID has not yet been signed!\n");
1351 static void Crypto_HostKeys_f(void)
1354 crypto_storedhostkey_t *hk;
1357 if(!d0_blind_id_dll)
1359 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1362 for(i = 0; i < CRYPTO_HOSTKEY_HASHSIZE; ++i)
1364 for(hk = crypto_storedhostkey_hashtable[i]; hk; hk = hk->next)
1366 LHNETADDRESS_ToString(&hk->addr, buf, sizeof(buf), 1);
1367 Con_Printf("%d %s@%.*s %s\n",
1370 crypto_keyfp_recommended_length, pubkeys_fp64[hk->keyid],
1376 static void Crypto_HostKey_Clear_f(void)
1378 lhnetaddress_t addr;
1381 if(!d0_blind_id_dll)
1383 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1387 for(i = 1; i < Cmd_Argc(); ++i)
1389 LHNETADDRESS_FromString(&addr, Cmd_Argv(i), 26000);
1390 if(Crypto_ClearHostKey(&addr))
1392 Con_Printf("cleared host key for %s\n", Cmd_Argv(i));
1397 void Crypto_Init_Commands(void)
1401 Cmd_AddCommand("crypto_reload", Crypto_Reload_f, "reloads cryptographic keys");
1402 Cmd_AddCommand("crypto_keygen", Crypto_KeyGen_f, "generates and saves a cryptographic key");
1403 Cmd_AddCommand("crypto_keys", Crypto_Keys_f, "lists the loaded keys");
1404 Cmd_AddCommand("crypto_hostkeys", Crypto_HostKeys_f, "lists the cached host keys");
1405 Cmd_AddCommand("crypto_hostkey_clear", Crypto_HostKey_Clear_f, "clears a cached host key");
1406 Cvar_RegisterVariable(&crypto_developer);
1408 Cvar_RegisterVariable(&crypto_aeslevel);
1410 crypto_aeslevel.integer = 0; // make sure
1411 Cvar_RegisterVariable(&crypto_servercpupercent);
1412 Cvar_RegisterVariable(&crypto_servercpumaxtime);
1413 Cvar_RegisterVariable(&crypto_servercpudebug);
1419 static void aescpy(unsigned char *key, const unsigned char *iv, unsigned char *dst, const unsigned char *src, size_t len)
1421 const unsigned char *xorpos = iv;
1422 unsigned char xorbuf[16];
1423 unsigned long rk[D0_RIJNDAEL_RKLENGTH(DHKEY_SIZE * 8)];
1425 qd0_rijndael_setup_encrypt(rk, key, DHKEY_SIZE * 8);
1428 for(i = 0; i < 16; ++i)
1429 xorbuf[i] = src[i] ^ xorpos[i];
1430 qd0_rijndael_encrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), xorbuf, dst);
1438 for(i = 0; i < len; ++i)
1439 xorbuf[i] = src[i] ^ xorpos[i];
1441 xorbuf[i] = xorpos[i];
1442 qd0_rijndael_encrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), xorbuf, dst);
1445 static void seacpy(unsigned char *key, const unsigned char *iv, unsigned char *dst, const unsigned char *src, size_t len)
1447 const unsigned char *xorpos = iv;
1448 unsigned char xorbuf[16];
1449 unsigned long rk[D0_RIJNDAEL_RKLENGTH(DHKEY_SIZE * 8)];
1451 qd0_rijndael_setup_decrypt(rk, key, DHKEY_SIZE * 8);
1454 qd0_rijndael_decrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), src, xorbuf);
1455 for(i = 0; i < 16; ++i)
1456 dst[i] = xorbuf[i] ^ xorpos[i];
1464 qd0_rijndael_decrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), src, xorbuf);
1465 for(i = 0; i < len; ++i)
1466 dst[i] = xorbuf[i] ^ xorpos[i];
1470 // NOTE: we MUST avoid the following begins of the packet:
1471 // 1. 0xFF, 0xFF, 0xFF, 0xFF
1472 // 2. 0x80, 0x00, length/256, length%256
1473 // this luckily does NOT affect AES mode, where the first byte always is in the range from 0x00 to 0x0F
1474 const void *Crypto_EncryptPacket(crypto_t *crypto, const void *data_src, size_t len_src, void *data_dst, size_t *len_dst, size_t len)
1476 unsigned char h[32];
1478 if(crypto->authenticated)
1482 // AES packet = 1 byte length overhead, 15 bytes from HMAC-SHA-256, data, 0..15 bytes padding
1483 // 15 bytes HMAC-SHA-256 (112bit) suffice as the attacker can't do more than forge a random-looking packet
1484 // HMAC is needed to not leak information about packet content
1485 if(developer_networking.integer)
1487 Con_Print("To be encrypted:\n");
1488 Com_HexDumpToConsole((const unsigned char *) data_src, (int)len_src);
1490 if(len_src + 32 > len || !HMAC_SHA256_32BYTES(h, (const unsigned char *) data_src, (int)len_src, crypto->dhkey, DHKEY_SIZE))
1492 Con_Printf("Crypto_EncryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1495 *len_dst = ((len_src + 15) / 16) * 16 + 16; // add 16 for HMAC, then round to 16-size for AES
1496 ((unsigned char *) data_dst)[0] = (unsigned char)(*len_dst - len_src);
1497 memcpy(((unsigned char *) data_dst)+1, h, 15);
1498 aescpy(crypto->dhkey, (const unsigned char *) data_dst, ((unsigned char *) data_dst) + 16, (const unsigned char *) data_src, len_src);
1503 // HMAC packet = 16 bytes HMAC-SHA-256 (truncated to 128 bits), data
1504 if(len_src + 16 > len || !HMAC_SHA256_32BYTES(h, (const unsigned char *) data_src, (int)len_src, crypto->dhkey, DHKEY_SIZE))
1506 Con_Printf("Crypto_EncryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1509 *len_dst = len_src + 16;
1510 memcpy(data_dst, h, 16);
1511 memcpy(((unsigned char *) data_dst) + 16, (unsigned char *) data_src, len_src);
1513 // handle the "avoid" conditions:
1514 i = BuffBigLong((unsigned char *) data_dst);
1516 (i == (int)0xFFFFFFFF) // avoid QW control packet
1518 (i == (int)0x80000000 + (int)*len_dst) // avoid NQ control packet
1520 *(unsigned char *)data_dst ^= 0x80; // this will ALWAYS fix it
1531 const void *Crypto_DecryptPacket(crypto_t *crypto, const void *data_src, size_t len_src, void *data_dst, size_t *len_dst, size_t len)
1533 unsigned char h[32];
1536 // silently handle non-crypto packets
1537 i = BuffBigLong((unsigned char *) data_src);
1539 (i == (int)0xFFFFFFFF) // avoid QW control packet
1541 (i == (int)0x80000000 + (int)len_src) // avoid NQ control packet
1545 if(crypto->authenticated)
1549 if(len_src < 16 || ((len_src - 16) % 16))
1551 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1554 *len_dst = len_src - ((unsigned char *) data_src)[0];
1555 if(len < *len_dst || *len_dst > len_src - 16)
1557 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d->%d bytes out)\n", (int) len_src, (int) *len_dst, (int) len);
1560 seacpy(crypto->dhkey, (unsigned char *) data_src, (unsigned char *) data_dst, ((const unsigned char *) data_src) + 16, *len_dst);
1562 if(!HMAC_SHA256_32BYTES(h, (const unsigned char *) data_dst, (int)*len_dst, crypto->dhkey, DHKEY_SIZE))
1564 Con_Printf("HMAC fail\n");
1567 if(memcmp(((const unsigned char *) data_src)+1, h, 15)) // ignore first byte, used for length
1569 Con_Printf("HMAC mismatch\n");
1572 if(developer_networking.integer)
1574 Con_Print("Decrypted:\n");
1575 Com_HexDumpToConsole((const unsigned char *) data_dst, (int)*len_dst);
1577 return data_dst; // no need to copy
1583 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1586 *len_dst = len_src - 16;
1589 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d->%d bytes out)\n", (int) len_src, (int) *len_dst, (int) len);
1592 //memcpy(data_dst, data_src + 16, *len_dst);
1593 if(!HMAC_SHA256_32BYTES(h, ((const unsigned char *) data_src) + 16, (int)*len_dst, crypto->dhkey, DHKEY_SIZE))
1595 Con_Printf("HMAC fail\n");
1596 Com_HexDumpToConsole((const unsigned char *) data_src, (int)len_src);
1600 if(memcmp((const unsigned char *) data_src, h, 16)) // ignore first byte, used for length
1602 // undo the "avoid conditions"
1604 (i == (int)0x7FFFFFFF) // avoided QW control packet
1606 (i == (int)0x00000000 + (int)len_src) // avoided NQ control packet
1609 // do the avoidance on the hash too
1611 if(memcmp((const unsigned char *) data_src, h, 16)) // ignore first byte, used for length
1613 Con_Printf("HMAC mismatch\n");
1614 Com_HexDumpToConsole((const unsigned char *) data_src, (int)len_src);
1620 Con_Printf("HMAC mismatch\n");
1621 Com_HexDumpToConsole((const unsigned char *) data_src, (int)len_src);
1625 return ((const unsigned char *) data_src) + 16; // no need to copy, so data_dst is not used
1636 const char *Crypto_GetInfoResponseDataString(void)
1638 crypto_idstring_buf[0] = '0' + crypto_aeslevel.integer;
1639 return crypto_idstring;
1643 qboolean Crypto_ServerAppendToChallenge(const char *data_in, size_t len_in, char *data_out, size_t *len_out, size_t maxlen_out)
1645 // cheap op, all is precomputed
1646 if(!d0_blind_id_dll)
1647 return false; // no support
1649 if(maxlen_out <= *len_out + challenge_append_length)
1651 memcpy(data_out + *len_out, challenge_append, challenge_append_length);
1652 *len_out += challenge_append_length;
1656 static int Crypto_ServerError(char *data_out, size_t *len_out, const char *msg, const char *msg_client)
1660 Con_DPrintf("rejecting client: %s\n", msg);
1662 dpsnprintf(data_out, *len_out, "reject %s", msg_client);
1663 *len_out = strlen(data_out);
1664 return CRYPTO_DISCARD;
1667 static int Crypto_SoftServerError(char *data_out, size_t *len_out, const char *msg)
1670 Con_DPrintf("%s\n", msg);
1671 return CRYPTO_DISCARD;
1674 static int Crypto_ServerParsePacket_Internal(const char *data_in, size_t len_in, char *data_out, size_t *len_out, lhnetaddress_t *peeraddress)
1676 // if "connect": reject if in the middle of crypto handshake
1677 crypto_t *crypto = NULL;
1678 char *data_out_p = data_out;
1679 const char *string = data_in;
1683 char infostringvalue[MAX_INPUTLINE];
1686 if(!d0_blind_id_dll)
1687 return CRYPTO_NOMATCH; // no support
1689 if (len_in > 8 && !memcmp(string, "connect\\", 8) && d0_rijndael_dll && crypto_aeslevel.integer >= 3)
1693 // sorry, we have to verify the challenge here to not reflect network spam
1695 if (!(s = InfoString_GetValue(string + 4, "challenge", infostringvalue, sizeof(infostringvalue))))
1696 return CRYPTO_NOMATCH; // will be later accepted if encryption was set up
1697 // validate the challenge
1698 for (i = 0;i < MAX_CHALLENGES;i++)
1699 if(challenge[i].time > 0)
1700 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1702 // if the challenge is not recognized, drop the packet
1703 if (i == MAX_CHALLENGES) // challenge mismatch is silent
1704 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1706 crypto = Crypto_ServerFindInstance(peeraddress, false);
1707 if(!crypto || !crypto->authenticated)
1708 return Crypto_ServerError(data_out, len_out, "This server requires authentication and encryption to be supported by your client", NULL);
1710 else if(len_in > 5 && !memcmp(string, "d0pk\\", 5) && ((LHNETADDRESS_GetAddressType(peeraddress) == LHNETADDRESSTYPE_LOOP) || sv_public.integer > -3))
1712 const char *cnt, *s, *p;
1714 int clientid = -1, serverid = -1;
1715 cnt = InfoString_GetValue(string + 4, "id", infostringvalue, sizeof(infostringvalue));
1716 id = (cnt ? atoi(cnt) : -1);
1717 cnt = InfoString_GetValue(string + 4, "cnt", infostringvalue, sizeof(infostringvalue));
1719 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1720 GetUntilNul(&data_in, &len_in);
1722 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1723 if(!strcmp(cnt, "0"))
1726 if (!(s = InfoString_GetValue(string + 4, "challenge", infostringvalue, sizeof(infostringvalue))))
1727 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1728 // validate the challenge
1729 for (i = 0;i < MAX_CHALLENGES;i++)
1730 if(challenge[i].time > 0)
1731 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1733 // if the challenge is not recognized, drop the packet
1734 if (i == MAX_CHALLENGES) // challenge mismatch is silent
1735 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1737 if (!(s = InfoString_GetValue(string + 4, "aeslevel", infostringvalue, sizeof(infostringvalue))))
1738 aeslevel = 0; // not supported
1740 aeslevel = bound(0, atoi(s), 3);
1741 switch(bound(0, d0_rijndael_dll ? crypto_aeslevel.integer : 0, 3))
1743 default: // dummy, never happens, but to make gcc happy...
1746 return Crypto_ServerError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)", NULL);
1750 aes = (aeslevel >= 2);
1753 aes = (aeslevel >= 1);
1757 return Crypto_ServerError(data_out, len_out, "This server requires encryption to be supported (crypto_aeslevel >= 1, and d0_rijndael library must be present)", NULL);
1762 p = GetUntilNul(&data_in, &len_in);
1765 // Find the highest numbered matching key for p.
1766 for(i = 0; i < MAX_PUBKEYS; ++i)
1769 if(!strcmp(p, pubkeys_fp64[i]))
1770 if(pubkeys_havepriv[i])
1774 return Crypto_ServerError(data_out, len_out, "Invalid server key", NULL);
1776 p = GetUntilNul(&data_in, &len_in);
1779 // Find the highest numbered matching key for p.
1780 for(i = 0; i < MAX_PUBKEYS; ++i)
1783 if(!strcmp(p, pubkeys_fp64[i]))
1787 return Crypto_ServerError(data_out, len_out, "Invalid client key", NULL);
1790 crypto = Crypto_ServerFindInstance(peeraddress, true);
1792 return Crypto_ServerError(data_out, len_out, "Could not create a crypto connect instance", NULL);
1794 CDATA->cdata_id = id;
1795 CDATA->s = serverid;
1796 CDATA->c = clientid;
1797 memset(crypto->dhkey, 0, sizeof(crypto->dhkey));
1798 CDATA->challenge[0] = 0;
1799 crypto->client_keyfp[0] = 0;
1800 crypto->client_idfp[0] = 0;
1801 crypto->server_keyfp[0] = 0;
1802 crypto->server_idfp[0] = 0;
1803 crypto->use_aes = aes != 0;
1807 // I am the server, and my key is ok... so let's set server_keyfp and server_idfp
1808 strlcpy(crypto->server_keyfp, pubkeys_fp64[CDATA->s], sizeof(crypto->server_keyfp));
1809 strlcpy(crypto->server_idfp, pubkeys_priv_fp64[CDATA->s], sizeof(crypto->server_idfp));
1812 CDATA->id = qd0_blind_id_new();
1816 return Crypto_ServerError(data_out, len_out, "d0_blind_id_new failed", "Internal error");
1818 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->s]))
1821 return Crypto_ServerError(data_out, len_out, "d0_blind_id_copy failed", "Internal error");
1823 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\1\\id\\%d\\aes\\%d", CDATA->cdata_id, crypto->use_aes));
1824 if(!qd0_blind_id_authenticate_with_private_id_start(CDATA->id, true, false, "XONOTIC", 8, data_out_p, len_out)) // len_out receives used size by this op
1827 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_start failed", "Internal error");
1829 CDATA->next_step = 2;
1830 data_out_p += *len_out;
1831 *len_out = data_out_p - data_out;
1832 return CRYPTO_DISCARD;
1834 else if(CDATA->c >= 0)
1837 CDATA->id = qd0_blind_id_new();
1841 return Crypto_ServerError(data_out, len_out, "d0_blind_id_new failed", "Internal error");
1843 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
1846 return Crypto_ServerError(data_out, len_out, "d0_blind_id_copy failed", "Internal error");
1848 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\5\\id\\%d\\aes\\%d", CDATA->cdata_id, crypto->use_aes));
1849 if(!qd0_blind_id_authenticate_with_private_id_challenge(CDATA->id, true, false, data_in, len_in, data_out_p, len_out, &status))
1852 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_challenge failed", "Internal error");
1854 CDATA->next_step = 6;
1855 data_out_p += *len_out;
1856 *len_out = data_out_p - data_out;
1857 return CRYPTO_DISCARD;
1862 return Crypto_ServerError(data_out, len_out, "Missing client and server key", NULL);
1865 else if(!strcmp(cnt, "2"))
1868 crypto = Crypto_ServerFindInstance(peeraddress, false);
1870 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1872 if(CDATA->cdata_id != id)
1873 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
1874 if(CDATA->next_step != 2)
1875 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
1877 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\3\\id\\%d", CDATA->cdata_id));
1878 if(!qd0_blind_id_authenticate_with_private_id_response(CDATA->id, data_in, len_in, data_out_p, len_out))
1881 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_response failed", "Internal error");
1883 fpbuflen = DHKEY_SIZE;
1884 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) crypto->dhkey, &fpbuflen))
1887 return Crypto_ServerError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed", "Internal error");
1891 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
1894 return Crypto_ServerError(data_out, len_out, "d0_blind_id_copy failed", "Internal error");
1896 CDATA->next_step = 4;
1900 // session key is FINISHED (no server part is to be expected)! By this, all keys are set up
1901 crypto->authenticated = true;
1902 CDATA->next_step = 0;
1904 data_out_p += *len_out;
1905 *len_out = data_out_p - data_out;
1906 return CRYPTO_DISCARD;
1908 else if(!strcmp(cnt, "4"))
1910 crypto = Crypto_ServerFindInstance(peeraddress, false);
1912 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1914 if(CDATA->cdata_id != id)
1915 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
1916 if(CDATA->next_step != 4)
1917 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
1918 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\5\\id\\%d", CDATA->cdata_id));
1919 if(!qd0_blind_id_authenticate_with_private_id_challenge(CDATA->id, true, false, data_in, len_in, data_out_p, len_out, &status))
1922 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_challenge failed", "Internal error");
1924 CDATA->next_step = 6;
1925 data_out_p += *len_out;
1926 *len_out = data_out_p - data_out;
1927 return CRYPTO_DISCARD;
1929 else if(!strcmp(cnt, "6"))
1931 static char msgbuf[32];
1932 size_t msgbuflen = sizeof(msgbuf);
1935 unsigned char dhkey[DHKEY_SIZE];
1936 crypto = Crypto_ServerFindInstance(peeraddress, false);
1938 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1940 if(CDATA->cdata_id != id)
1941 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
1942 if(CDATA->next_step != 6)
1943 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
1945 if(!qd0_blind_id_authenticate_with_private_id_verify(CDATA->id, data_in, len_in, msgbuf, &msgbuflen, &status))
1948 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_verify failed (authentication error)", "Authentication error");
1951 strlcpy(crypto->client_keyfp, pubkeys_fp64[CDATA->c], sizeof(crypto->client_keyfp));
1953 crypto->client_keyfp[0] = 0;
1954 memset(crypto->client_idfp, 0, sizeof(crypto->client_idfp));
1955 fpbuflen = FP64_SIZE;
1956 if(!qd0_blind_id_fingerprint64_public_id(CDATA->id, crypto->client_idfp, &fpbuflen))
1959 return Crypto_ServerError(data_out, len_out, "d0_blind_id_fingerprint64_public_id failed", "Internal error");
1961 fpbuflen = DHKEY_SIZE;
1962 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) dhkey, &fpbuflen))
1965 return Crypto_ServerError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed", "Internal error");
1967 // XOR the two DH keys together to make one
1968 for(i = 0; i < DHKEY_SIZE; ++i)
1969 crypto->dhkey[i] ^= dhkey[i];
1971 // session key is FINISHED (no server part is to be expected)! By this, all keys are set up
1972 crypto->authenticated = true;
1973 CDATA->next_step = 0;
1974 // send a challenge-less challenge
1975 PutWithNul(&data_out_p, len_out, "challenge ");
1976 *len_out = data_out_p - data_out;
1977 --*len_out; // remove NUL terminator
1978 return CRYPTO_MATCH;
1980 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1982 return CRYPTO_NOMATCH;
1985 int Crypto_ServerParsePacket(const char *data_in, size_t len_in, char *data_out, size_t *len_out, lhnetaddress_t *peeraddress)
1989 static double complain_time = 0;
1991 qboolean do_time = false;
1992 qboolean do_reject = false;
1993 char infostringvalue[MAX_INPUTLINE];
1994 if(crypto_servercpupercent.value > 0 || crypto_servercpumaxtime.value > 0)
1995 if(len_in > 5 && !memcmp(data_in, "d0pk\\", 5))
1998 cnt = InfoString_GetValue(data_in + 4, "cnt", infostringvalue, sizeof(infostringvalue));
2000 if(!strcmp(cnt, "0"))
2005 // check if we may perform crypto...
2006 if(crypto_servercpupercent.value > 0)
2008 crypto_servercpu_accumulator += (realtime - crypto_servercpu_lastrealtime) * crypto_servercpupercent.value * 0.01;
2009 if(crypto_servercpumaxtime.value)
2010 if(crypto_servercpu_accumulator > crypto_servercpumaxtime.value)
2011 crypto_servercpu_accumulator = crypto_servercpumaxtime.value;
2015 if(crypto_servercpumaxtime.value > 0)
2016 if(realtime != crypto_servercpu_lastrealtime)
2017 crypto_servercpu_accumulator = crypto_servercpumaxtime.value;
2019 crypto_servercpu_lastrealtime = realtime;
2020 if(do_reject && crypto_servercpu_accumulator < 0)
2022 if(realtime > complain_time + 5)
2023 Con_Printf("crypto: cannot perform requested crypto operations; denial service attack or crypto_servercpupercent/crypto_servercpumaxtime are too low\n");
2025 return CRYPTO_DISCARD;
2027 t = Sys_DirtyTime();
2029 ret = Crypto_ServerParsePacket_Internal(data_in, len_in, data_out, len_out, peeraddress);
2032 t = Sys_DirtyTime() - t;if (t < 0.0) t = 0.0; // dirtytime can step backwards
2033 if(crypto_servercpudebug.integer)
2034 Con_Printf("crypto: accumulator was %.1f ms, used %.1f ms for crypto, ", crypto_servercpu_accumulator * 1000, t * 1000);
2035 crypto_servercpu_accumulator -= t;
2036 if(crypto_servercpudebug.integer)
2037 Con_Printf("is %.1f ms\n", crypto_servercpu_accumulator * 1000);
2042 static int Crypto_ClientError(char *data_out, size_t *len_out, const char *msg)
2044 dpsnprintf(data_out, *len_out, "reject %s", msg);
2045 *len_out = strlen(data_out);
2046 return CRYPTO_REPLACE;
2049 static int Crypto_SoftClientError(char *data_out, size_t *len_out, const char *msg)
2052 Con_Printf("%s\n", msg);
2053 return CRYPTO_DISCARD;
2056 int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out, size_t *len_out, lhnetaddress_t *peeraddress)
2058 crypto_t *crypto = &cls.crypto;
2059 const char *string = data_in;
2062 char *data_out_p = data_out;
2064 char infostringvalue[MAX_INPUTLINE];
2067 if(!d0_blind_id_dll)
2068 return CRYPTO_NOMATCH; // no support
2070 // if "challenge": verify challenge, and discard message, send next crypto protocol message instead
2071 // otherwise, just handle actual protocol messages
2073 if (len_in == 6 && !memcmp(string, "accept", 6) && cls.connect_trying && d0_rijndael_dll)
2075 int wantserverid = -1;
2076 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL);
2077 if(!crypto || !crypto->authenticated) // we ALSO get here if we are using an encrypted connection, so let's rule this out
2079 if(wantserverid >= 0)
2080 return Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present");
2081 if(crypto_aeslevel.integer >= 3)
2082 return Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)");
2084 return CRYPTO_NOMATCH;
2086 else if (len_in >= 1 && string[0] == 'j' && cls.connect_trying && d0_rijndael_dll)
2088 int wantserverid = -1;
2089 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL);
2090 //if(!crypto || !crypto->authenticated)
2092 if(wantserverid >= 0)
2093 return Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present");
2094 if(crypto_aeslevel.integer >= 3)
2095 return Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)");
2097 return CRYPTO_NOMATCH;
2099 else if (len_in >= 5 && BuffLittleLong((unsigned char *) string) == ((int)NETFLAG_CTL | (int)len_in))
2101 int wantserverid = -1;
2103 // these three are harmless
2104 if(string[4] == CCREP_SERVER_INFO)
2105 return CRYPTO_NOMATCH;
2106 if(string[4] == CCREP_PLAYER_INFO)
2107 return CRYPTO_NOMATCH;
2108 if(string[4] == CCREP_RULE_INFO)
2109 return CRYPTO_NOMATCH;
2111 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL);
2112 //if(!crypto || !crypto->authenticated)
2114 if(wantserverid >= 0)
2115 return Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present");
2116 if(crypto_aeslevel.integer >= 3)
2117 return Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)");
2119 return CRYPTO_NOMATCH;
2121 else if (len_in >= 13 && !memcmp(string, "infoResponse\x0A", 13))
2123 s = InfoString_GetValue(string + 13, "d0_blind_id", infostringvalue, sizeof(infostringvalue));
2125 Crypto_StoreHostKey(peeraddress, s, true);
2126 return CRYPTO_NOMATCH;
2128 else if (len_in >= 15 && !memcmp(string, "statusResponse\x0A", 15))
2132 p = strchr(string + 15, '\n');
2136 * (char *) p = 0; // cut off the string there
2138 s = InfoString_GetValue(string + 15, "d0_blind_id", infostringvalue, sizeof(infostringvalue));
2140 Crypto_StoreHostKey(peeraddress, s, true);
2143 * (char *) p = save;
2144 // invoking those nasal demons again (do not run this on the DS9k)
2146 return CRYPTO_NOMATCH;
2148 else if(len_in > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
2150 const char *vlen_blind_id_ptr = NULL;
2151 size_t len_blind_id_ptr = 0;
2153 const char *challenge = data_in + 10;
2156 int clientid = -1, serverid = -1, wantserverid = -1;
2157 qboolean server_can_auth = true;
2158 char wantserver_idfp[FP64_SIZE+1];
2159 int wantserver_aeslevel = 0;
2161 // if we have a stored host key for the server, assume serverid to already be selected!
2162 // (the loop will refuse to overwrite this one then)
2163 wantserver_idfp[0] = 0;
2164 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, wantserver_idfp, sizeof(wantserver_idfp), &wantserver_aeslevel);
2165 // requirement: wantserver_idfp is a full ID if wantserverid set
2167 // if we leave, we have to consider the connection
2168 // unauthenticated; NOTE: this may be faked by a clever
2169 // attacker to force an unauthenticated connection; so we have
2170 // a safeguard check in place when encryption is required too
2171 // in place, or when authentication is required by the server
2172 crypto->authenticated = false;
2174 GetUntilNul(&data_in, &len_in);
2176 return (wantserverid >= 0) ? Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present") :
2177 (d0_rijndael_dll && crypto_aeslevel.integer >= 3) ? Crypto_ServerError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)", NULL) :
2180 // FTEQW extension protocol
2183 k = Crypto_LittleLong(data_in);
2184 v = Crypto_LittleLong(data_in + 4);
2192 k = Crypto_LittleLong(data_in);
2197 case PROTOCOL_D0_BLIND_ID:
2198 vlen_blind_id_ptr = data_in;
2199 len_blind_id_ptr = v;
2211 if(!vlen_blind_id_ptr)
2212 return (wantserverid >= 0) ? Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though authentication is required") :
2213 (d0_rijndael_dll && crypto_aeslevel.integer >= 3) ? Crypto_ServerError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)", NULL) :
2216 data_in = vlen_blind_id_ptr;
2217 len_in = len_blind_id_ptr;
2219 // parse fingerprints
2220 // once we found a fingerprint we can auth to (ANY), select it as clientfp
2221 // once we found a fingerprint in the first list that we know, select it as serverfp
2225 p = GetUntilNul(&data_in, &len_in);
2230 if(!server_can_auth)
2231 break; // other protocol message may follow
2232 server_can_auth = false;
2237 // Find the highest numbered matching key for p.
2238 for(i = 0; i < MAX_PUBKEYS; ++i)
2241 if(!strcmp(p, pubkeys_fp64[i]))
2243 if(pubkeys_havepriv[i])
2246 if(wantserverid < 0 || i == wantserverid)
2250 // Not breaking, as higher keys in the list always have priority.
2253 // if stored host key is not found:
2254 if(wantserverid >= 0 && serverid < 0)
2255 return Crypto_ClientError(data_out, len_out, "Server CA does not match stored host key, refusing to connect");
2257 if(serverid >= 0 || clientid >= 0)
2260 CDATA->cdata_id = ++cdata_id;
2261 CDATA->s = serverid;
2262 CDATA->c = clientid;
2263 memset(crypto->dhkey, 0, sizeof(crypto->dhkey));
2264 strlcpy(CDATA->challenge, challenge, sizeof(CDATA->challenge));
2265 crypto->client_keyfp[0] = 0;
2266 crypto->client_idfp[0] = 0;
2267 crypto->server_keyfp[0] = 0;
2268 crypto->server_idfp[0] = 0;
2269 memcpy(CDATA->wantserver_idfp, wantserver_idfp, sizeof(crypto->server_idfp));
2271 if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2272 switch(bound(0, d0_rijndael_dll ? crypto_aeslevel.integer : 0, 3))
2274 default: // dummy, never happens, but to make gcc happy...
2276 if(wantserver_aeslevel >= 3)
2277 return Crypto_ServerError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)", NULL);
2278 CDATA->wantserver_aes = false;
2281 CDATA->wantserver_aes = (wantserver_aeslevel >= 2);
2284 CDATA->wantserver_aes = (wantserver_aeslevel >= 1);
2287 if(wantserver_aeslevel <= 0)
2288 return Crypto_ServerError(data_out, len_out, "This server requires encryption to be supported (crypto_aeslevel >= 1, and d0_rijndael library must be present)", NULL);
2289 CDATA->wantserver_aes = true;
2293 // build outgoing message
2294 // append regular stuff
2295 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\0\\id\\%d\\aeslevel\\%d\\challenge\\%s", CDATA->cdata_id, d0_rijndael_dll ? crypto_aeslevel.integer : 0, challenge));
2296 PutWithNul(&data_out_p, len_out, serverid >= 0 ? pubkeys_fp64[serverid] : "");
2297 PutWithNul(&data_out_p, len_out, clientid >= 0 ? pubkeys_fp64[clientid] : "");
2301 // I am the client, and my key is ok... so let's set client_keyfp and client_idfp
2302 strlcpy(crypto->client_keyfp, pubkeys_fp64[CDATA->c], sizeof(crypto->client_keyfp));
2303 strlcpy(crypto->client_idfp, pubkeys_priv_fp64[CDATA->c], sizeof(crypto->client_idfp));
2309 CDATA->id = qd0_blind_id_new();
2313 return Crypto_ClientError(data_out, len_out, "d0_blind_id_new failed");
2315 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->s]))
2318 return Crypto_ClientError(data_out, len_out, "d0_blind_id_copy failed");
2320 CDATA->next_step = 1;
2321 *len_out = data_out_p - data_out;
2323 else if(clientid >= 0)
2325 // skip over server auth, perform client auth only
2327 CDATA->id = qd0_blind_id_new();
2331 return Crypto_ClientError(data_out, len_out, "d0_blind_id_new failed");
2333 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
2336 return Crypto_ClientError(data_out, len_out, "d0_blind_id_copy failed");
2338 if(!qd0_blind_id_authenticate_with_private_id_start(CDATA->id, true, false, "XONOTIC", 8, data_out_p, len_out)) // len_out receives used size by this op
2341 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_start failed");
2343 CDATA->next_step = 5;
2344 data_out_p += *len_out;
2345 *len_out = data_out_p - data_out;
2348 *len_out = data_out_p - data_out;
2350 return CRYPTO_DISCARD;
2354 if(wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2355 if(wantserver_aeslevel >= 3)
2356 return Crypto_ClientError(data_out, len_out, "Server insists on encryption, but neither can authenticate to the other");
2357 return (d0_rijndael_dll && crypto_aeslevel.integer >= 3) ? Crypto_ServerError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)", NULL) :
2361 else if(len_in > 5 && !memcmp(string, "d0pk\\", 5) && cls.connect_trying)
2365 cnt = InfoString_GetValue(string + 4, "id", infostringvalue, sizeof(infostringvalue));
2366 id = (cnt ? atoi(cnt) : -1);
2367 cnt = InfoString_GetValue(string + 4, "cnt", infostringvalue, sizeof(infostringvalue));
2369 return Crypto_ClientError(data_out, len_out, "d0pk\\ message without cnt");
2370 GetUntilNul(&data_in, &len_in);
2372 return Crypto_ClientError(data_out, len_out, "d0pk\\ message without attachment");
2374 if(!strcmp(cnt, "1"))
2377 if(CDATA->cdata_id != id)
2378 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
2379 if(CDATA->next_step != 1)
2380 return Crypto_SoftClientError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
2382 cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
2384 if((s = InfoString_GetValue(string + 4, "aes", infostringvalue, sizeof(infostringvalue))))
2388 // we CANNOT toggle the AES status any more!
2389 // as the server already decided
2390 if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2391 if(!aes && CDATA->wantserver_aes)
2394 return Crypto_ClientError(data_out, len_out, "Stored host key requires encryption, but server did not enable encryption");
2396 if(aes && (!d0_rijndael_dll || crypto_aeslevel.integer <= 0))
2399 return Crypto_ClientError(data_out, len_out, "Server insists on encryption too hard");
2401 if(!aes && (d0_rijndael_dll && crypto_aeslevel.integer >= 3))
2404 return Crypto_ClientError(data_out, len_out, "Server insists on plaintext too hard");
2406 crypto->use_aes = aes != 0;
2408 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\2\\id\\%d", CDATA->cdata_id));
2409 if(!qd0_blind_id_authenticate_with_private_id_challenge(CDATA->id, true, false, data_in, len_in, data_out_p, len_out, &status))
2412 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_challenge failed");
2414 CDATA->next_step = 3;
2415 data_out_p += *len_out;
2416 *len_out = data_out_p - data_out;
2417 return CRYPTO_DISCARD;
2419 else if(!strcmp(cnt, "3"))
2421 static char msgbuf[32];
2422 size_t msgbuflen = sizeof(msgbuf);
2426 if(CDATA->cdata_id != id)
2427 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
2428 if(CDATA->next_step != 3)
2429 return Crypto_SoftClientError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
2431 cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
2433 if(!qd0_blind_id_authenticate_with_private_id_verify(CDATA->id, data_in, len_in, msgbuf, &msgbuflen, &status))
2436 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_verify failed (server authentication error)");
2439 strlcpy(crypto->server_keyfp, pubkeys_fp64[CDATA->s], sizeof(crypto->server_keyfp));
2441 crypto->server_keyfp[0] = 0;
2442 memset(crypto->server_idfp, 0, sizeof(crypto->server_idfp));
2443 fpbuflen = FP64_SIZE;
2444 if(!qd0_blind_id_fingerprint64_public_id(CDATA->id, crypto->server_idfp, &fpbuflen))
2447 return Crypto_ClientError(data_out, len_out, "d0_blind_id_fingerprint64_public_id failed");
2449 if(CDATA->wantserver_idfp[0])
2450 if(memcmp(CDATA->wantserver_idfp, crypto->server_idfp, sizeof(crypto->server_idfp)))
2453 return Crypto_ClientError(data_out, len_out, "Server ID does not match stored host key, refusing to connect");
2455 fpbuflen = DHKEY_SIZE;
2456 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) crypto->dhkey, &fpbuflen))
2459 return Crypto_ClientError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed");
2462 // cache the server key
2463 Crypto_StoreHostKey(&cls.connect_address, va(vabuf, sizeof(vabuf), "%d %s@%s", crypto->use_aes ? 1 : 0, crypto->server_idfp, pubkeys_fp64[CDATA->s]), false);
2467 // client will auth next
2468 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\4\\id\\%d", CDATA->cdata_id));
2469 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
2472 return Crypto_ClientError(data_out, len_out, "d0_blind_id_copy failed");
2474 if(!qd0_blind_id_authenticate_with_private_id_start(CDATA->id, true, false, "XONOTIC", 8, data_out_p, len_out)) // len_out receives used size by this op
2477 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_start failed");
2479 CDATA->next_step = 5;
2480 data_out_p += *len_out;
2481 *len_out = data_out_p - data_out;
2482 return CRYPTO_DISCARD;
2486 // session key is FINISHED (no server part is to be expected)! By this, all keys are set up
2487 crypto->authenticated = true;
2488 CDATA->next_step = 0;
2489 // assume we got the empty challenge to finish the protocol
2490 PutWithNul(&data_out_p, len_out, "challenge ");
2491 *len_out = data_out_p - data_out;
2492 --*len_out; // remove NUL terminator
2493 return CRYPTO_REPLACE;
2496 else if(!strcmp(cnt, "5"))
2499 unsigned char dhkey[DHKEY_SIZE];
2503 if(CDATA->cdata_id != id)
2504 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
2505 if(CDATA->next_step != 5)
2506 return Crypto_SoftClientError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
2508 cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
2510 if(CDATA->s < 0) // only if server didn't auth
2512 if((s = InfoString_GetValue(string + 4, "aes", infostringvalue, sizeof(infostringvalue))))
2516 if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2517 if(!aes && CDATA->wantserver_aes)
2520 return Crypto_ClientError(data_out, len_out, "Stored host key requires encryption, but server did not enable encryption");
2522 if(aes && (!d0_rijndael_dll || crypto_aeslevel.integer <= 0))
2525 return Crypto_ClientError(data_out, len_out, "Server insists on encryption too hard");
2527 if(!aes && (d0_rijndael_dll && crypto_aeslevel.integer >= 3))
2530 return Crypto_ClientError(data_out, len_out, "Server insists on plaintext too hard");
2532 crypto->use_aes = aes != 0;
2535 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\6\\id\\%d", CDATA->cdata_id));
2536 if(!qd0_blind_id_authenticate_with_private_id_response(CDATA->id, data_in, len_in, data_out_p, len_out))
2539 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_response failed");
2541 fpbuflen = DHKEY_SIZE;
2542 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) dhkey, &fpbuflen))
2545 return Crypto_ClientError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed");
2547 // XOR the two DH keys together to make one
2548 for(i = 0; i < DHKEY_SIZE; ++i)
2549 crypto->dhkey[i] ^= dhkey[i];
2550 // session key is FINISHED! By this, all keys are set up
2551 crypto->authenticated = true;
2552 CDATA->next_step = 0;
2553 data_out_p += *len_out;
2554 *len_out = data_out_p - data_out;
2555 return CRYPTO_DISCARD;
2557 return Crypto_SoftClientError(data_out, len_out, "Got unknown d0_blind_id message from server");
2560 return CRYPTO_NOMATCH;
2563 size_t Crypto_SignData(const void *data, size_t datasize, int keyid, void *signed_data, size_t signed_size)
2565 if(keyid < 0 || keyid >= MAX_PUBKEYS)
2567 if(!pubkeys_havepriv[keyid])
2569 if(qd0_blind_id_sign_with_private_id_sign(pubkeys[keyid], true, false, (const char *)data, datasize, (char *)signed_data, &signed_size))
2574 size_t Crypto_SignDataDetached(const void *data, size_t datasize, int keyid, void *signed_data, size_t signed_size)
2576 if(keyid < 0 || keyid >= MAX_PUBKEYS)
2578 if(!pubkeys_havepriv[keyid])
2580 if(qd0_blind_id_sign_with_private_id_sign_detached(pubkeys[keyid], true, false, (const char *)data, datasize, (char *)signed_data, &signed_size))