1 // TODO key loading, generating, saving
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], lumpsize[i]);
95 memcpy(&buf[pos], lumps[i], lumpsize[i]);
100 // END stuff shared with xonotic-keygen
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
149 // d0_blind_id interface
152 #define D0_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
154 #define D0_WARN_UNUSED_RESULT
158 typedef struct d0_blind_id_s d0_blind_id_t;
159 typedef D0_BOOL (*d0_fastreject_function) (const d0_blind_id_t *ctx, void *pass);
160 static D0_EXPORT D0_WARN_UNUSED_RESULT d0_blind_id_t *(*qd0_blind_id_new) (void);
161 static D0_EXPORT void (*qd0_blind_id_free) (d0_blind_id_t *a);
162 //static D0_EXPORT void (*qd0_blind_id_clear) (d0_blind_id_t *ctx);
163 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_copy) (d0_blind_id_t *ctx, const d0_blind_id_t *src);
164 //static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_generate_private_key) (d0_blind_id_t *ctx, int k);
165 //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);
166 //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);
167 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);
168 //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);
169 //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);
170 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);
171 //static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_generate_private_id_modulus) (d0_blind_id_t *ctx);
172 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);
173 //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);
174 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_generate_private_id_start) (d0_blind_id_t *ctx);
175 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);
176 //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);
177 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);
178 //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);
179 //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);
180 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);
181 //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);
182 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);
183 //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);
184 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);
185 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);
186 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);
187 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);
188 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);
189 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
190 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_INITIALIZE) (void);
191 static D0_EXPORT void (*qd0_blind_id_SHUTDOWN) (void);
192 static D0_EXPORT void (*qd0_blind_id_util_sha256) (char *out, const char *in, size_t n);
193 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);
194 static dllfunction_t d0_blind_id_funcs[] =
196 {"d0_blind_id_new", (void **) &qd0_blind_id_new},
197 {"d0_blind_id_free", (void **) &qd0_blind_id_free},
198 //{"d0_blind_id_clear", (void **) &qd0_blind_id_clear},
199 {"d0_blind_id_copy", (void **) &qd0_blind_id_copy},
200 //{"d0_blind_id_generate_private_key", (void **) &qd0_blind_id_generate_private_key},
201 //{"d0_blind_id_generate_private_key_fastreject", (void **) &qd0_blind_id_generate_private_key_fastreject},
202 //{"d0_blind_id_read_private_key", (void **) &qd0_blind_id_read_private_key},
203 {"d0_blind_id_read_public_key", (void **) &qd0_blind_id_read_public_key},
204 //{"d0_blind_id_write_private_key", (void **) &qd0_blind_id_write_private_key},
205 //{"d0_blind_id_write_public_key", (void **) &qd0_blind_id_write_public_key},
206 {"d0_blind_id_fingerprint64_public_key", (void **) &qd0_blind_id_fingerprint64_public_key},
207 //{"d0_blind_id_generate_private_id_modulus", (void **) &qd0_blind_id_generate_private_id_modulus},
208 {"d0_blind_id_read_private_id_modulus", (void **) &qd0_blind_id_read_private_id_modulus},
209 //{"d0_blind_id_write_private_id_modulus", (void **) &qd0_blind_id_write_private_id_modulus},
210 {"d0_blind_id_generate_private_id_start", (void **) &qd0_blind_id_generate_private_id_start},
211 {"d0_blind_id_generate_private_id_request", (void **) &qd0_blind_id_generate_private_id_request},
212 //{"d0_blind_id_answer_private_id_request", (void **) &qd0_blind_id_answer_private_id_request},
213 {"d0_blind_id_finish_private_id_request", (void **) &qd0_blind_id_finish_private_id_request},
214 //{"d0_blind_id_read_private_id_request_camouflage", (void **) &qd0_blind_id_read_private_id_request_camouflage},
215 //{"d0_blind_id_write_private_id_request_camouflage", (void **) &qd0_blind_id_write_private_id_request_camouflage},
216 {"d0_blind_id_read_private_id", (void **) &qd0_blind_id_read_private_id},
217 //{"d0_blind_id_read_public_id", (void **) &qd0_blind_id_read_public_id},
218 {"d0_blind_id_write_private_id", (void **) &qd0_blind_id_write_private_id},
219 //{"d0_blind_id_write_public_id", (void **) &qd0_blind_id_write_public_id},
220 {"d0_blind_id_authenticate_with_private_id_start", (void **) &qd0_blind_id_authenticate_with_private_id_start},
221 {"d0_blind_id_authenticate_with_private_id_challenge", (void **) &qd0_blind_id_authenticate_with_private_id_challenge},
222 {"d0_blind_id_authenticate_with_private_id_response", (void **) &qd0_blind_id_authenticate_with_private_id_response},
223 {"d0_blind_id_authenticate_with_private_id_verify", (void **) &qd0_blind_id_authenticate_with_private_id_verify},
224 {"d0_blind_id_fingerprint64_public_id", (void **) &qd0_blind_id_fingerprint64_public_id},
225 {"d0_blind_id_sessionkey_public_id", (void **) &qd0_blind_id_sessionkey_public_id},
226 {"d0_blind_id_INITIALIZE", (void **) &qd0_blind_id_INITIALIZE},
227 {"d0_blind_id_SHUTDOWN", (void **) &qd0_blind_id_SHUTDOWN},
228 {"d0_blind_id_util_sha256", (void **) &qd0_blind_id_util_sha256},
229 {"d0_blind_id_sign_with_private_id_sign", (void **) &qd0_blind_id_sign_with_private_id_sign},
232 // end of d0_blind_id interface
234 static dllhandle_t d0_blind_id_dll = NULL;
235 static qboolean Crypto_OpenLibrary (void)
237 const char* dllnames [] =
240 "libd0_blind_id-0.dll",
241 #elif defined(MACOSX)
242 "libd0_blind_id.0.dylib",
244 "libd0_blind_id.so.0",
245 "libd0_blind_id.so", // FreeBSD
255 return Sys_LoadLibrary (dllnames, &d0_blind_id_dll, d0_blind_id_funcs);
258 static void Crypto_CloseLibrary (void)
260 Sys_UnloadLibrary (&d0_blind_id_dll);
265 #ifdef CRYPTO_RIJNDAEL_STATIC
267 #include <d0_blind_id/d0_rijndael.h>
269 #define d0_rijndael_dll 1
270 #define Crypto_Rijndael_OpenLibrary() true
271 #define Crypto_Rijndael_CloseLibrary()
273 #define qd0_rijndael_setup_encrypt d0_rijndael_setup_encrypt
274 #define qd0_rijndael_setup_decrypt d0_rijndael_setup_decrypt
275 #define qd0_rijndael_encrypt d0_rijndael_encrypt
276 #define qd0_rijndael_decrypt d0_rijndael_decrypt
280 // no need to do the #define dance here, as the upper part declares out macros either way
282 D0_EXPORT int (*qd0_rijndael_setup_encrypt) (unsigned long *rk, const unsigned char *key,
284 D0_EXPORT int (*qd0_rijndael_setup_decrypt) (unsigned long *rk, const unsigned char *key,
286 D0_EXPORT void (*qd0_rijndael_encrypt) (const unsigned long *rk, int nrounds,
287 const unsigned char plaintext[16], unsigned char ciphertext[16]);
288 D0_EXPORT void (*qd0_rijndael_decrypt) (const unsigned long *rk, int nrounds,
289 const unsigned char ciphertext[16], unsigned char plaintext[16]);
290 #define D0_RIJNDAEL_KEYLENGTH(keybits) ((keybits)/8)
291 #define D0_RIJNDAEL_RKLENGTH(keybits) ((keybits)/8+28)
292 #define D0_RIJNDAEL_NROUNDS(keybits) ((keybits)/32+6)
293 static dllfunction_t d0_rijndael_funcs[] =
295 {"d0_rijndael_setup_decrypt", (void **) &qd0_rijndael_setup_decrypt},
296 {"d0_rijndael_setup_encrypt", (void **) &qd0_rijndael_setup_encrypt},
297 {"d0_rijndael_decrypt", (void **) &qd0_rijndael_decrypt},
298 {"d0_rijndael_encrypt", (void **) &qd0_rijndael_encrypt},
301 // end of d0_blind_id interface
303 static dllhandle_t d0_rijndael_dll = NULL;
304 static qboolean Crypto_Rijndael_OpenLibrary (void)
306 const char* dllnames [] =
309 "libd0_rijndael-0.dll",
310 #elif defined(MACOSX)
311 "libd0_rijndael.0.dylib",
313 "libd0_rijndael.so.0",
314 "libd0_rijndael.so", // FreeBSD
324 return Sys_LoadLibrary (dllnames, &d0_rijndael_dll, d0_rijndael_funcs);
327 static void Crypto_Rijndael_CloseLibrary (void)
329 Sys_UnloadLibrary (&d0_rijndael_dll);
335 void sha256(unsigned char *out, const unsigned char *in, int n)
337 qd0_blind_id_util_sha256((char *) out, (const char *) in, n);
340 static size_t Crypto_LoadFile(const char *path, char *buf, size_t nmax)
345 f = FS_SysOpen(va("%s%s", fs_userdir, path), "rb", false);
347 f = FS_SysOpen(va("%s%s", fs_basedir, path), "rb", false);
350 n = FS_Read(f, buf, nmax);
357 static qboolean PutWithNul(char **data, size_t *len, const char *str)
359 // invariant: data points to insertion point
360 size_t l = strlen(str);
363 memcpy(*data, str, l+1);
369 static const char *GetUntilNul(const char **data, size_t *len)
371 // invariant: data points to next character to take
372 const char *data_save = *data;
385 p = (const char *) memchr(*data, 0, *len);
386 if(!p) // no terminating NUL
399 return (const char *) data_save;
406 static d0_blind_id_t *Crypto_ReadPublicKey(char *buf, size_t len)
408 d0_blind_id_t *pk = NULL;
411 if(Crypto_ParsePack(buf, len, FOURCC_D0PK, p, l, 2))
413 pk = qd0_blind_id_new();
415 if(qd0_blind_id_read_public_key(pk, p[0], l[0]))
416 if(qd0_blind_id_read_private_id_modulus(pk, p[1], l[1]))
420 qd0_blind_id_free(pk);
425 static qboolean Crypto_AddPrivateKey(d0_blind_id_t *pk, char *buf, size_t len)
429 if(Crypto_ParsePack(buf, len, FOURCC_D0SI, p, l, 1))
431 if(qd0_blind_id_read_private_id(pk, p[0], l[0]))
437 #define MAX_PUBKEYS 16
438 static d0_blind_id_t *pubkeys[MAX_PUBKEYS];
439 static char pubkeys_fp64[MAX_PUBKEYS][FP64_SIZE+1];
440 static qboolean pubkeys_havepriv[MAX_PUBKEYS];
441 static char pubkeys_priv_fp64[MAX_PUBKEYS][FP64_SIZE+1];
442 static char challenge_append[1400];
443 static size_t challenge_append_length;
445 static int keygen_i = -1;
446 static char keygen_buf[8192];
448 #define MAX_CRYPTOCONNECTS 16
449 #define CRYPTOCONNECT_NONE 0
450 #define CRYPTOCONNECT_PRECONNECT 1
451 #define CRYPTOCONNECT_CONNECT 2
452 #define CRYPTOCONNECT_RECONNECT 3
453 #define CRYPTOCONNECT_DUPLICATE 4
454 typedef struct server_cryptoconnect_s
457 lhnetaddress_t address;
461 server_cryptoconnect_t;
462 static server_cryptoconnect_t cryptoconnects[MAX_CRYPTOCONNECTS];
464 static int cdata_id = 0;
470 char challenge[2048];
471 char wantserver_idfp[FP64_SIZE+1];
472 qboolean wantserver_aes;
477 // crypto specific helpers
478 #define CDATA ((crypto_data_t *) crypto->data)
479 #define MAKE_CDATA if(!crypto->data) crypto->data = Z_Malloc(sizeof(crypto_data_t))
480 #define CLEAR_CDATA if(crypto->data) { if(CDATA->id) qd0_blind_id_free(CDATA->id); Z_Free(crypto->data); } crypto->data = NULL
482 static crypto_t *Crypto_ServerFindInstance(lhnetaddress_t *peeraddress, qboolean allow_create)
488 return NULL; // no support
490 for(i = 0; i < MAX_CRYPTOCONNECTS; ++i)
491 if(LHNETADDRESS_Compare(peeraddress, &cryptoconnects[i].address))
493 if(i < MAX_CRYPTOCONNECTS && (allow_create || cryptoconnects[i].crypto.data))
495 crypto = &cryptoconnects[i].crypto;
496 cryptoconnects[i].lasttime = realtime;
502 for(i = 1; i < MAX_CRYPTOCONNECTS; ++i)
503 if(cryptoconnects[i].lasttime < cryptoconnects[best].lasttime)
505 crypto = &cryptoconnects[best].crypto;
506 cryptoconnects[best].lasttime = realtime;
507 memcpy(&cryptoconnects[best].address, peeraddress, sizeof(cryptoconnects[best].address));
512 qboolean Crypto_ServerFinishInstance(crypto_t *out, crypto_t *crypto)
514 // no check needed here (returned pointers are only used in prefilled fields)
515 if(!crypto || !crypto->authenticated)
517 Con_Printf("Passed an invalid crypto connect instance\n");
518 memset(out, 0, sizeof(*out));
522 memcpy(out, crypto, sizeof(*out));
523 memset(crypto, 0, sizeof(crypto));
527 crypto_t *Crypto_ServerGetInstance(lhnetaddress_t *peeraddress)
529 // no check needed here (returned pointers are only used in prefilled fields)
530 return Crypto_ServerFindInstance(peeraddress, false);
533 typedef struct crypto_storedhostkey_s
535 struct crypto_storedhostkey_s *next;
538 char idfp[FP64_SIZE+1];
541 crypto_storedhostkey_t;
542 static crypto_storedhostkey_t *crypto_storedhostkey_hashtable[CRYPTO_HOSTKEY_HASHSIZE];
544 static void Crypto_InitHostKeys(void)
547 for(i = 0; i < CRYPTO_HOSTKEY_HASHSIZE; ++i)
548 crypto_storedhostkey_hashtable[i] = NULL;
551 static void Crypto_ClearHostKeys(void)
554 crypto_storedhostkey_t *hk, *hkn;
555 for(i = 0; i < CRYPTO_HOSTKEY_HASHSIZE; ++i)
557 for(hk = crypto_storedhostkey_hashtable[i]; hk; hk = hkn)
562 crypto_storedhostkey_hashtable[i] = NULL;
566 static qboolean Crypto_ClearHostKey(lhnetaddress_t *peeraddress)
570 crypto_storedhostkey_t **hkp;
571 qboolean found = false;
573 LHNETADDRESS_ToString(peeraddress, buf, sizeof(buf), 1);
574 hashindex = CRC_Block((const unsigned char *) buf, strlen(buf)) % CRYPTO_HOSTKEY_HASHSIZE;
575 for(hkp = &crypto_storedhostkey_hashtable[hashindex]; *hkp && LHNETADDRESS_Compare(&((*hkp)->addr), peeraddress); hkp = &((*hkp)->next));
579 crypto_storedhostkey_t *hk = *hkp;
588 static void Crypto_StoreHostKey(lhnetaddress_t *peeraddress, const char *keystring, qboolean complain)
592 crypto_storedhostkey_t *hk;
594 char idfp[FP64_SIZE+1];
600 // syntax of keystring:
601 // aeslevel id@key id@key ...
605 aeslevel = bound(0, *keystring - '0', 3);
606 while(*keystring && *keystring != ' ')
610 while(*keystring && keyid < 0)
613 const char *idstart, *idend, *keystart, *keyend;
614 ++keystring; // skip the space
616 while(*keystring && *keystring != ' ' && *keystring != '@')
622 keystart = keystring;
623 while(*keystring && *keystring != ' ')
627 if(idend - idstart == FP64_SIZE && keyend - keystart == FP64_SIZE)
629 for(keyid = 0; keyid < MAX_PUBKEYS; ++keyid)
631 if(!memcmp(pubkeys_fp64[keyid], keystart, FP64_SIZE))
633 memcpy(idfp, idstart, FP64_SIZE);
637 if(keyid >= MAX_PUBKEYS)
645 LHNETADDRESS_ToString(peeraddress, buf, sizeof(buf), 1);
646 hashindex = CRC_Block((const unsigned char *) buf, strlen(buf)) % CRYPTO_HOSTKEY_HASHSIZE;
647 for(hk = crypto_storedhostkey_hashtable[hashindex]; hk && LHNETADDRESS_Compare(&hk->addr, peeraddress); hk = hk->next);
653 if(hk->keyid != keyid || memcmp(hk->idfp, idfp, FP64_SIZE+1))
654 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);
655 if(hk->aeslevel > aeslevel)
656 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);
658 hk->aeslevel = max(aeslevel, hk->aeslevel);
662 // great, we did NOT have it yet
663 hk = (crypto_storedhostkey_t *) Z_Malloc(sizeof(*hk));
664 memcpy(&hk->addr, peeraddress, sizeof(hk->addr));
666 memcpy(hk->idfp, idfp, FP64_SIZE+1);
667 hk->next = crypto_storedhostkey_hashtable[hashindex];
668 hk->aeslevel = aeslevel;
669 crypto_storedhostkey_hashtable[hashindex] = hk;
672 qboolean Crypto_RetrieveHostKey(lhnetaddress_t *peeraddress, int *keyid, char *keyfp, size_t keyfplen, char *idfp, size_t idfplen, int *aeslevel)
676 crypto_storedhostkey_t *hk;
681 LHNETADDRESS_ToString(peeraddress, buf, sizeof(buf), 1);
682 hashindex = CRC_Block((const unsigned char *) buf, strlen(buf)) % CRYPTO_HOSTKEY_HASHSIZE;
683 for(hk = crypto_storedhostkey_hashtable[hashindex]; hk && LHNETADDRESS_Compare(&hk->addr, peeraddress); hk = hk->next);
691 strlcpy(keyfp, pubkeys_fp64[hk->keyid], keyfplen);
693 strlcpy(idfp, hk->idfp, idfplen);
695 *aeslevel = hk->aeslevel;
699 int Crypto_RetrieveLocalKey(int keyid, char *keyfp, size_t keyfplen, char *idfp, size_t idfplen) // return value: -1 if more to come, +1 if valid, 0 if end of list
701 if(keyid < 0 || keyid >= MAX_PUBKEYS)
710 strlcpy(keyfp, pubkeys_fp64[keyid], keyfplen);
712 if(pubkeys_havepriv[keyid])
713 strlcpy(idfp, pubkeys_priv_fp64[keyid], keyfplen);
718 // init/shutdown code
719 static void Crypto_BuildChallengeAppend(void)
721 char *p, *lengthptr, *startptr;
724 p = challenge_append;
725 n = sizeof(challenge_append);
726 Crypto_UnLittleLong(p, PROTOCOL_VLEN);
730 Crypto_UnLittleLong(p, 0);
733 Crypto_UnLittleLong(p, PROTOCOL_D0_BLIND_ID);
737 for(i = 0; i < MAX_PUBKEYS; ++i)
738 if(pubkeys_havepriv[i])
739 PutWithNul(&p, &n, pubkeys_fp64[i]);
740 PutWithNul(&p, &n, "");
741 for(i = 0; i < MAX_PUBKEYS; ++i)
742 if(!pubkeys_havepriv[i] && pubkeys[i])
743 PutWithNul(&p, &n, pubkeys_fp64[i]);
744 Crypto_UnLittleLong(lengthptr, p - startptr);
745 challenge_append_length = p - challenge_append;
748 static void Crypto_LoadKeys(void)
755 // note: we are just a CLIENT
757 // PUBLIC KEYS to accept (including modulus)
758 // PRIVATE KEY of user
760 crypto_idstring = NULL;
761 dpsnprintf(crypto_idstring_buf, sizeof(crypto_idstring_buf), "%d", d0_rijndael_dll ? crypto_aeslevel.integer : 0);
762 for(i = 0; i < MAX_PUBKEYS; ++i)
764 memset(pubkeys_fp64[i], 0, sizeof(pubkeys_fp64[i]));
765 memset(pubkeys_priv_fp64[i], 0, sizeof(pubkeys_fp64[i]));
766 pubkeys_havepriv[i] = false;
767 len = Crypto_LoadFile(va("key_%d.d0pk", i), buf, sizeof(buf));
768 if((pubkeys[i] = Crypto_ReadPublicKey(buf, len)))
771 if(qd0_blind_id_fingerprint64_public_key(pubkeys[i], pubkeys_fp64[i], &len2)) // keeps final NUL
773 Con_Printf("Loaded public key key_%d.d0pk (fingerprint: %s)\n", i, pubkeys_fp64[i]);
774 len = Crypto_LoadFile(va("key_%d.d0si", i), buf, sizeof(buf));
777 if(Crypto_AddPrivateKey(pubkeys[i], buf, len))
780 if(qd0_blind_id_fingerprint64_public_id(pubkeys[i], pubkeys_priv_fp64[i], &len2)) // keeps final NUL
782 Con_Printf("Loaded private ID key_%d.d0si for key_%d.d0pk (fingerprint: %s)\n", i, i, pubkeys_priv_fp64[i]);
783 pubkeys_havepriv[i] = true;
784 strlcat(crypto_idstring_buf, va(" %s@%s", pubkeys_priv_fp64[i], pubkeys_fp64[i]), sizeof(crypto_idstring_buf));
788 // can't really happen
789 // but nothing leaked here
796 // can't really happen
797 qd0_blind_id_free(pubkeys[i]);
802 crypto_idstring = crypto_idstring_buf;
805 Crypto_BuildChallengeAppend();
807 // find a good prefix length for all the keys we know (yes, algorithm is not perfect yet, may yield too long prefix length)
808 crypto_keyfp_recommended_length = 0;
809 memset(buf+256, 0, MAX_PUBKEYS + MAX_PUBKEYS);
810 while(crypto_keyfp_recommended_length < FP64_SIZE)
813 for(i = 0; i < MAX_PUBKEYS; ++i)
817 ++buf[(unsigned char) pubkeys_fp64[i][crypto_keyfp_recommended_length]];
818 if(pubkeys_havepriv[i])
819 if(!buf[256 + MAX_PUBKEYS + i])
820 ++buf[(unsigned char) pubkeys_priv_fp64[i][crypto_keyfp_recommended_length]];
822 for(i = 0; i < MAX_PUBKEYS; ++i)
826 if(buf[(unsigned char) pubkeys_fp64[i][crypto_keyfp_recommended_length]] < 2)
828 if(pubkeys_havepriv[i])
829 if(!buf[256 + MAX_PUBKEYS + i])
830 if(buf[(unsigned char) pubkeys_priv_fp64[i][crypto_keyfp_recommended_length]] < 2)
831 buf[256 + MAX_PUBKEYS + i] = 1;
833 ++crypto_keyfp_recommended_length;
834 for(i = 0; i < MAX_PUBKEYS; ++i)
839 if(pubkeys_havepriv[i])
840 if(!buf[256 + MAX_PUBKEYS + i])
846 if(crypto_keyfp_recommended_length < 7)
847 crypto_keyfp_recommended_length = 7;
850 static void Crypto_UnloadKeys(void)
854 for(i = 0; i < MAX_PUBKEYS; ++i)
857 qd0_blind_id_free(pubkeys[i]);
859 pubkeys_havepriv[i] = false;
860 memset(pubkeys_fp64[i], 0, sizeof(pubkeys_fp64[i]));
861 memset(pubkeys_priv_fp64[i], 0, sizeof(pubkeys_fp64[i]));
862 challenge_append_length = 0;
864 crypto_idstring = NULL;
867 void Crypto_Shutdown(void)
872 Crypto_Rijndael_CloseLibrary();
877 for(i = 0; i < MAX_CRYPTOCONNECTS; ++i)
879 crypto = &cryptoconnects[i].crypto;
882 memset(cryptoconnects, 0, sizeof(cryptoconnects));
883 crypto = &cls.crypto;
888 qd0_blind_id_SHUTDOWN();
890 Crypto_CloseLibrary();
894 void Crypto_Init(void)
896 if(!Crypto_OpenLibrary())
899 if(!qd0_blind_id_INITIALIZE())
901 Crypto_Rijndael_CloseLibrary();
902 Crypto_CloseLibrary();
903 Con_Printf("libd0_blind_id initialization FAILED, cryptography support has been disabled\n");
907 Crypto_Rijndael_OpenLibrary(); // if this fails, it's uncritical
909 Crypto_InitHostKeys();
915 static void Crypto_KeyGen_Finished(int code, size_t length_received, unsigned char *buffer, void *cbdata)
919 static char buf[8192];
920 static char buf2[8192];
921 size_t bufsize, buf2size;
923 d0_blind_id_t *ctx, *ctx2;
929 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
934 if(keygen_i >= MAX_PUBKEYS || !pubkeys[keygen_i])
936 Con_Printf("overflow of keygen_i\n");
942 Con_Printf("Unexpected response from keygen server:\n");
943 Com_HexDumpToConsole(buffer, length_received);
946 if(!Crypto_ParsePack((const char *) buffer, length_received, FOURCC_D0IR, p, l, 1))
948 if(length_received >= 5 && Crypto_LittleLong((const char *) buffer) == FOURCC_D0ER)
950 Con_Printf("Error response from keygen server: %.*s\n", (int)(length_received - 5), buffer + 5);
954 Con_Printf("Invalid response from keygen server:\n");
955 Com_HexDumpToConsole(buffer, length_received);
960 if(!qd0_blind_id_finish_private_id_request(pubkeys[keygen_i], p[0], l[0]))
962 Con_Printf("d0_blind_id_finish_private_id_request failed\n");
967 // verify the key we just got (just in case)
968 ctx = qd0_blind_id_new();
971 Con_Printf("d0_blind_id_new failed\n");
975 ctx2 = qd0_blind_id_new();
978 Con_Printf("d0_blind_id_new failed\n");
979 qd0_blind_id_free(ctx);
983 if(!qd0_blind_id_copy(ctx, pubkeys[keygen_i]))
985 Con_Printf("d0_blind_id_copy failed\n");
986 qd0_blind_id_free(ctx);
987 qd0_blind_id_free(ctx2);
991 if(!qd0_blind_id_copy(ctx2, pubkeys[keygen_i]))
993 Con_Printf("d0_blind_id_copy failed\n");
994 qd0_blind_id_free(ctx);
995 qd0_blind_id_free(ctx2);
999 bufsize = sizeof(buf);
1000 if(!qd0_blind_id_authenticate_with_private_id_start(ctx, 1, 1, "hello world", 11, buf, &bufsize))
1002 Con_Printf("d0_blind_id_authenticate_with_private_id_start failed\n");
1003 qd0_blind_id_free(ctx);
1004 qd0_blind_id_free(ctx2);
1008 buf2size = sizeof(buf2);
1009 if(!qd0_blind_id_authenticate_with_private_id_challenge(ctx2, 1, 1, buf, bufsize, buf2, &buf2size, &status) || !status)
1011 Con_Printf("d0_blind_id_authenticate_with_private_id_challenge failed (server does not have the requested private key)\n");
1012 qd0_blind_id_free(ctx);
1013 qd0_blind_id_free(ctx2);
1017 bufsize = sizeof(buf);
1018 if(!qd0_blind_id_authenticate_with_private_id_response(ctx, buf2, buf2size, buf, &bufsize))
1020 Con_Printf("d0_blind_id_authenticate_with_private_id_response failed\n");
1021 qd0_blind_id_free(ctx);
1022 qd0_blind_id_free(ctx2);
1026 buf2size = sizeof(buf2);
1027 if(!qd0_blind_id_authenticate_with_private_id_verify(ctx2, buf, bufsize, buf2, &buf2size, &status) || !status)
1029 Con_Printf("d0_blind_id_authenticate_with_private_id_verify failed (server does not have the requested private key)\n");
1030 qd0_blind_id_free(ctx);
1031 qd0_blind_id_free(ctx2);
1035 qd0_blind_id_free(ctx);
1036 qd0_blind_id_free(ctx2);
1038 // we have a valid key now!
1039 // make the rest of crypto.c know that
1041 if(qd0_blind_id_fingerprint64_public_id(pubkeys[keygen_i], pubkeys_priv_fp64[keygen_i], &len2)) // keeps final NUL
1043 Con_Printf("Received private ID key_%d.d0pk (fingerprint: %s)\n", keygen_i, pubkeys_priv_fp64[keygen_i]);
1044 pubkeys_havepriv[keygen_i] = true;
1045 strlcat(crypto_idstring_buf, va(" %s@%s", pubkeys_priv_fp64[keygen_i], pubkeys_fp64[keygen_i]), sizeof(crypto_idstring_buf));
1046 crypto_idstring = crypto_idstring_buf;
1047 Crypto_BuildChallengeAppend();
1049 // write the key to disk
1052 if(!qd0_blind_id_write_private_id(pubkeys[keygen_i], buf, &l[0]))
1054 Con_Printf("d0_blind_id_write_private_id failed\n");
1058 if(!(buf2size = Crypto_UnParsePack(buf2, sizeof(buf2), FOURCC_D0SI, p, l, 1)))
1060 Con_Printf("Crypto_UnParsePack failed\n");
1067 FS_CreatePath(va("%skey_%d.d0si", fs_userdir, keygen_i));
1068 f = FS_SysOpen(va("%skey_%d.d0si", fs_userdir, keygen_i), "wb", false);
1072 FS_CreatePath(va("%skey_%d.d0si", fs_basedir, keygen_i));
1073 f = FS_SysOpen(va("%skey_%d.d0si", fs_basedir, keygen_i), "wb", false);
1077 Con_Printf("Cannot open key_%d.d0si\n", keygen_i);
1081 FS_Write(f, buf2, buf2size);
1084 Con_Printf("Saved to key_%d.d0si\n", keygen_i);
1088 static void Crypto_KeyGen_f(void)
1093 static char buf[8192];
1094 static char buf2[8192];
1095 size_t buf2l, buf2pos;
1096 if(!d0_blind_id_dll)
1098 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1103 Con_Printf("usage:\n%s id url\n", Cmd_Argv(0));
1106 i = atoi(Cmd_Argv(1));
1109 Con_Printf("there is no public key %d\n", i);
1112 if(pubkeys_havepriv[i])
1114 Con_Printf("there is already a private key for %d\n", i);
1119 Con_Printf("there is already a keygen run on the way\n");
1123 if(!qd0_blind_id_generate_private_id_start(pubkeys[keygen_i]))
1125 Con_Printf("d0_blind_id_start failed\n");
1131 if(!qd0_blind_id_generate_private_id_request(pubkeys[keygen_i], buf, &l[0]))
1133 Con_Printf("d0_blind_id_generate_private_id_request failed\n");
1137 buf2pos = strlen(Cmd_Argv(2));
1138 memcpy(buf2, Cmd_Argv(2), buf2pos);
1139 if(!(buf2l = Crypto_UnParsePack(buf2 + buf2pos, sizeof(buf2) - buf2pos - 1, FOURCC_D0IQ, p, l, 1)))
1141 Con_Printf("Crypto_UnParsePack failed\n");
1145 if(!(buf2l = base64_encode((unsigned char *) (buf2 + buf2pos), buf2l, sizeof(buf2) - buf2pos - 1)))
1147 Con_Printf("base64_encode failed\n");
1153 if(!Curl_Begin_ToMemory(buf2, 0, (unsigned char *) keygen_buf, sizeof(keygen_buf), Crypto_KeyGen_Finished, NULL))
1155 Con_Printf("curl failed\n");
1159 Con_Printf("key generation in progress\n");
1164 static void Crypto_Reload_f(void)
1166 Crypto_ClearHostKeys();
1167 Crypto_UnloadKeys();
1171 static void Crypto_Keys_f(void)
1174 if(!d0_blind_id_dll)
1176 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1179 for(i = 0; i < MAX_PUBKEYS; ++i)
1183 Con_Printf("%2d: public key key_%d.d0pk (fingerprint: %s)\n", i, i, pubkeys_fp64[i]);
1184 if(pubkeys_havepriv[i])
1185 Con_Printf(" private key key_%d.d0si (fingerprint: %s)\n", i, pubkeys_priv_fp64[i]);
1190 static void Crypto_HostKeys_f(void)
1193 crypto_storedhostkey_t *hk;
1196 if(!d0_blind_id_dll)
1198 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1201 for(i = 0; i < CRYPTO_HOSTKEY_HASHSIZE; ++i)
1203 for(hk = crypto_storedhostkey_hashtable[i]; hk; hk = hk->next)
1205 LHNETADDRESS_ToString(&hk->addr, buf, sizeof(buf), 1);
1206 Con_Printf("%d %s@%.*s %s\n",
1209 crypto_keyfp_recommended_length, pubkeys_fp64[hk->keyid],
1215 static void Crypto_HostKey_Clear_f(void)
1217 lhnetaddress_t addr;
1220 if(!d0_blind_id_dll)
1222 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1226 for(i = 1; i < Cmd_Argc(); ++i)
1228 LHNETADDRESS_FromString(&addr, Cmd_Argv(i), 26000);
1229 if(Crypto_ClearHostKey(&addr))
1231 Con_Printf("cleared host key for %s\n", Cmd_Argv(i));
1236 void Crypto_Init_Commands(void)
1240 Cmd_AddCommand("crypto_reload", Crypto_Reload_f, "reloads cryptographic keys");
1241 Cmd_AddCommand("crypto_keygen", Crypto_KeyGen_f, "generates and saves a cryptographic key");
1242 Cmd_AddCommand("crypto_keys", Crypto_Keys_f, "lists the loaded keys");
1243 Cmd_AddCommand("crypto_hostkeys", Crypto_HostKeys_f, "lists the cached host keys");
1244 Cmd_AddCommand("crypto_hostkey_clear", Crypto_HostKey_Clear_f, "clears a cached host key");
1245 Cvar_RegisterVariable(&crypto_developer);
1247 Cvar_RegisterVariable(&crypto_aeslevel);
1249 crypto_aeslevel.integer = 0; // make sure
1250 Cvar_RegisterVariable(&crypto_servercpupercent);
1251 Cvar_RegisterVariable(&crypto_servercpumaxtime);
1252 Cvar_RegisterVariable(&crypto_servercpudebug);
1258 static void aescpy(unsigned char *key, const unsigned char *iv, unsigned char *dst, const unsigned char *src, size_t len)
1260 const unsigned char *xorpos = iv;
1261 unsigned char xorbuf[16];
1262 unsigned long rk[D0_RIJNDAEL_RKLENGTH(DHKEY_SIZE * 8)];
1264 qd0_rijndael_setup_encrypt(rk, key, DHKEY_SIZE * 8);
1267 for(i = 0; i < 16; ++i)
1268 xorbuf[i] = src[i] ^ xorpos[i];
1269 qd0_rijndael_encrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), xorbuf, dst);
1277 for(i = 0; i < len; ++i)
1278 xorbuf[i] = src[i] ^ xorpos[i];
1280 xorbuf[i] = xorpos[i];
1281 qd0_rijndael_encrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), xorbuf, dst);
1284 static void seacpy(unsigned char *key, const unsigned char *iv, unsigned char *dst, const unsigned char *src, size_t len)
1286 const unsigned char *xorpos = iv;
1287 unsigned char xorbuf[16];
1288 unsigned long rk[D0_RIJNDAEL_RKLENGTH(DHKEY_SIZE * 8)];
1290 qd0_rijndael_setup_decrypt(rk, key, DHKEY_SIZE * 8);
1293 qd0_rijndael_decrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), src, xorbuf);
1294 for(i = 0; i < 16; ++i)
1295 dst[i] = xorbuf[i] ^ xorpos[i];
1303 qd0_rijndael_decrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), src, xorbuf);
1304 for(i = 0; i < len; ++i)
1305 dst[i] = xorbuf[i] ^ xorpos[i];
1309 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)
1311 unsigned char h[32];
1312 if(crypto->authenticated)
1316 // AES packet = 1 byte length overhead, 15 bytes from HMAC-SHA-256, data, 0..15 bytes padding
1317 // 15 bytes HMAC-SHA-256 (112bit) suffice as the attacker can't do more than forge a random-looking packet
1318 // HMAC is needed to not leak information about packet content
1319 if(developer_networking.integer)
1321 Con_Print("To be encrypted:\n");
1322 Com_HexDumpToConsole((const unsigned char *) data_src, len_src);
1324 if(len_src + 32 > len || !HMAC_SHA256_32BYTES(h, (const unsigned char *) data_src, len_src, crypto->dhkey, DHKEY_SIZE))
1326 Con_Printf("Crypto_EncryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1329 *len_dst = ((len_src + 15) / 16) * 16 + 16; // add 16 for HMAC, then round to 16-size for AES
1330 ((unsigned char *) data_dst)[0] = *len_dst - len_src;
1331 memcpy(((unsigned char *) data_dst)+1, h, 15);
1332 aescpy(crypto->dhkey, (const unsigned char *) data_dst, ((unsigned char *) data_dst) + 16, (const unsigned char *) data_src, len_src);
1337 // HMAC packet = 16 bytes HMAC-SHA-256 (truncated to 128 bits), data
1338 if(len_src + 16 > len || !HMAC_SHA256_32BYTES(h, (const unsigned char *) data_src, len_src, crypto->dhkey, DHKEY_SIZE))
1340 Con_Printf("Crypto_EncryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1343 *len_dst = len_src + 16;
1344 memcpy(data_dst, h, 16);
1345 memcpy(((unsigned char *) data_dst) + 16, (unsigned char *) data_src, len_src);
1356 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)
1358 unsigned char h[32];
1359 if(crypto->authenticated)
1363 if(len_src < 16 || ((len_src - 16) % 16))
1365 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1368 *len_dst = len_src - ((unsigned char *) data_src)[0];
1369 if(len < *len_dst || *len_dst > len_src - 16)
1371 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d->%d bytes out)\n", (int) len_src, (int) *len_dst, (int) len);
1374 seacpy(crypto->dhkey, (unsigned char *) data_src, (unsigned char *) data_dst, ((const unsigned char *) data_src) + 16, *len_dst);
1376 if(!HMAC_SHA256_32BYTES(h, (const unsigned char *) data_dst, *len_dst, crypto->dhkey, DHKEY_SIZE))
1378 Con_Printf("HMAC fail\n");
1381 if(memcmp(((const unsigned char *) data_src)+1, h, 15)) // ignore first byte, used for length
1383 Con_Printf("HMAC mismatch\n");
1386 if(developer_networking.integer)
1388 Con_Print("Decrypted:\n");
1389 Com_HexDumpToConsole((const unsigned char *) data_dst, *len_dst);
1391 return data_dst; // no need to copy
1397 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1400 *len_dst = len_src - 16;
1403 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d->%d bytes out)\n", (int) len_src, (int) *len_dst, (int) len);
1406 //memcpy(data_dst, data_src + 16, *len_dst);
1407 if(!HMAC_SHA256_32BYTES(h, ((const unsigned char *) data_src) + 16, *len_dst, crypto->dhkey, DHKEY_SIZE))
1409 Con_Printf("HMAC fail\n");
1410 Com_HexDumpToConsole((const unsigned char *) data_src, len_src);
1413 if(memcmp((const unsigned char *) data_src, h, 16)) // ignore first byte, used for length
1415 Con_Printf("HMAC mismatch\n");
1416 Com_HexDumpToConsole((const unsigned char *) data_src, len_src);
1419 return ((const unsigned char *) data_src) + 16; // no need to copy, so data_dst is not used
1430 const char *Crypto_GetInfoResponseDataString(void)
1432 crypto_idstring_buf[0] = '0' + crypto_aeslevel.integer;
1433 return crypto_idstring;
1437 qboolean Crypto_ServerAppendToChallenge(const char *data_in, size_t len_in, char *data_out, size_t *len_out, size_t maxlen_out)
1439 // cheap op, all is precomputed
1440 if(!d0_blind_id_dll)
1441 return false; // no support
1443 if(maxlen_out <= *len_out + challenge_append_length)
1445 memcpy(data_out + *len_out, challenge_append, challenge_append_length);
1446 *len_out += challenge_append_length;
1450 static int Crypto_ServerError(char *data_out, size_t *len_out, const char *msg, const char *msg_client)
1454 Con_DPrintf("rejecting client: %s\n", msg);
1456 dpsnprintf(data_out, *len_out, "reject %s", msg_client);
1457 *len_out = strlen(data_out);
1458 return CRYPTO_DISCARD;
1461 static int Crypto_SoftServerError(char *data_out, size_t *len_out, const char *msg)
1464 Con_DPrintf("%s\n", msg);
1465 return CRYPTO_DISCARD;
1468 static int Crypto_ServerParsePacket_Internal(const char *data_in, size_t len_in, char *data_out, size_t *len_out, lhnetaddress_t *peeraddress)
1470 // if "connect": reject if in the middle of crypto handshake
1471 crypto_t *crypto = NULL;
1472 char *data_out_p = data_out;
1473 const char *string = data_in;
1478 if(!d0_blind_id_dll)
1479 return CRYPTO_NOMATCH; // no support
1481 if (len_in > 8 && !memcmp(string, "connect\\", 8) && d0_rijndael_dll && crypto_aeslevel.integer >= 3)
1485 // sorry, we have to verify the challenge here to not reflect network spam
1487 if (!(s = SearchInfostring(string + 4, "challenge")))
1488 return CRYPTO_NOMATCH; // will be later accepted if encryption was set up
1489 // validate the challenge
1490 for (i = 0;i < MAX_CHALLENGES;i++)
1491 if(challenge[i].time > 0)
1492 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1494 // if the challenge is not recognized, drop the packet
1495 if (i == MAX_CHALLENGES) // challenge mismatch is silent
1496 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1498 crypto = Crypto_ServerFindInstance(peeraddress, false);
1499 if(!crypto || !crypto->authenticated)
1500 return Crypto_ServerError(data_out, len_out, "This server requires authentication and encryption to be supported by your client", NULL);
1502 else if(len_in > 5 && !memcmp(string, "d0pk\\", 5) && ((LHNETADDRESS_GetAddressType(peeraddress) == LHNETADDRESSTYPE_LOOP) || sv_public.integer > -3))
1504 const char *cnt, *s, *p;
1506 int clientid = -1, serverid = -1;
1507 cnt = SearchInfostring(string + 4, "id");
1508 id = (cnt ? atoi(cnt) : -1);
1509 cnt = SearchInfostring(string + 4, "cnt");
1511 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1512 GetUntilNul(&data_in, &len_in);
1514 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1515 if(!strcmp(cnt, "0"))
1518 if (!(s = SearchInfostring(string + 4, "challenge")))
1519 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1520 // validate the challenge
1521 for (i = 0;i < MAX_CHALLENGES;i++)
1522 if(challenge[i].time > 0)
1523 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1525 // if the challenge is not recognized, drop the packet
1526 if (i == MAX_CHALLENGES) // challenge mismatch is silent
1527 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1529 if (!(s = SearchInfostring(string + 4, "aeslevel")))
1530 aeslevel = 0; // not supported
1532 aeslevel = bound(0, atoi(s), 3);
1533 switch(bound(0, d0_rijndael_dll ? crypto_aeslevel.integer : 0, 3))
1535 default: // dummy, never happens, but to make gcc happy...
1538 return Crypto_ServerError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)", NULL);
1542 aes = (aeslevel >= 2);
1545 aes = (aeslevel >= 1);
1549 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);
1554 p = GetUntilNul(&data_in, &len_in);
1557 for(i = 0; i < MAX_PUBKEYS; ++i)
1560 if(!strcmp(p, pubkeys_fp64[i]))
1561 if(pubkeys_havepriv[i])
1566 return Crypto_ServerError(data_out, len_out, "Invalid server key", NULL);
1568 p = GetUntilNul(&data_in, &len_in);
1571 for(i = 0; i < MAX_PUBKEYS; ++i)
1574 if(!strcmp(p, pubkeys_fp64[i]))
1579 return Crypto_ServerError(data_out, len_out, "Invalid client key", NULL);
1582 crypto = Crypto_ServerFindInstance(peeraddress, true);
1584 return Crypto_ServerError(data_out, len_out, "Could not create a crypto connect instance", NULL);
1586 CDATA->cdata_id = id;
1587 CDATA->s = serverid;
1588 CDATA->c = clientid;
1589 memset(crypto->dhkey, 0, sizeof(crypto->dhkey));
1590 CDATA->challenge[0] = 0;
1591 crypto->client_keyfp[0] = 0;
1592 crypto->client_idfp[0] = 0;
1593 crypto->server_keyfp[0] = 0;
1594 crypto->server_idfp[0] = 0;
1595 crypto->use_aes = aes != 0;
1599 // I am the server, and my key is ok... so let's set server_keyfp and server_idfp
1600 strlcpy(crypto->server_keyfp, pubkeys_fp64[CDATA->s], sizeof(crypto->server_keyfp));
1601 strlcpy(crypto->server_idfp, pubkeys_priv_fp64[CDATA->s], sizeof(crypto->server_idfp));
1604 CDATA->id = qd0_blind_id_new();
1608 return Crypto_ServerError(data_out, len_out, "d0_blind_id_new failed", "Internal error");
1610 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->s]))
1613 return Crypto_ServerError(data_out, len_out, "d0_blind_id_copy failed", "Internal error");
1615 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\1\\id\\%d\\aes\\%d", CDATA->cdata_id, crypto->use_aes));
1616 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
1619 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_start failed", "Internal error");
1621 CDATA->next_step = 2;
1622 data_out_p += *len_out;
1623 *len_out = data_out_p - data_out;
1624 return CRYPTO_DISCARD;
1626 else if(CDATA->c >= 0)
1629 CDATA->id = qd0_blind_id_new();
1633 return Crypto_ServerError(data_out, len_out, "d0_blind_id_new failed", "Internal error");
1635 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
1638 return Crypto_ServerError(data_out, len_out, "d0_blind_id_copy failed", "Internal error");
1640 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\5\\id\\%d\\aes\\%d", CDATA->cdata_id, crypto->use_aes));
1641 if(!qd0_blind_id_authenticate_with_private_id_challenge(CDATA->id, true, false, data_in, len_in, data_out_p, len_out, &status))
1644 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_challenge failed", "Internal error");
1646 CDATA->next_step = 6;
1647 data_out_p += *len_out;
1648 *len_out = data_out_p - data_out;
1649 return CRYPTO_DISCARD;
1654 return Crypto_ServerError(data_out, len_out, "Missing client and server key", NULL);
1657 else if(!strcmp(cnt, "2"))
1660 crypto = Crypto_ServerFindInstance(peeraddress, false);
1662 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1664 if(CDATA->cdata_id != id)
1665 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
1666 if(CDATA->next_step != 2)
1667 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
1669 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\3\\id\\%d", CDATA->cdata_id));
1670 if(!qd0_blind_id_authenticate_with_private_id_response(CDATA->id, data_in, len_in, data_out_p, len_out))
1673 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_response failed", "Internal error");
1675 fpbuflen = DHKEY_SIZE;
1676 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) crypto->dhkey, &fpbuflen))
1679 return Crypto_ServerError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed", "Internal error");
1683 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
1686 return Crypto_ServerError(data_out, len_out, "d0_blind_id_copy failed", "Internal error");
1688 CDATA->next_step = 4;
1692 // session key is FINISHED (no server part is to be expected)! By this, all keys are set up
1693 crypto->authenticated = true;
1694 CDATA->next_step = 0;
1696 data_out_p += *len_out;
1697 *len_out = data_out_p - data_out;
1698 return CRYPTO_DISCARD;
1700 else if(!strcmp(cnt, "4"))
1702 crypto = Crypto_ServerFindInstance(peeraddress, false);
1704 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1706 if(CDATA->cdata_id != id)
1707 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
1708 if(CDATA->next_step != 4)
1709 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
1710 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\5\\id\\%d", CDATA->cdata_id));
1711 if(!qd0_blind_id_authenticate_with_private_id_challenge(CDATA->id, true, false, data_in, len_in, data_out_p, len_out, &status))
1714 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_challenge failed", "Internal error");
1716 CDATA->next_step = 6;
1717 data_out_p += *len_out;
1718 *len_out = data_out_p - data_out;
1719 return CRYPTO_DISCARD;
1721 else if(!strcmp(cnt, "6"))
1723 static char msgbuf[32];
1724 size_t msgbuflen = sizeof(msgbuf);
1727 unsigned char dhkey[DHKEY_SIZE];
1728 crypto = Crypto_ServerFindInstance(peeraddress, false);
1730 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1732 if(CDATA->cdata_id != id)
1733 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
1734 if(CDATA->next_step != 6)
1735 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
1737 if(!qd0_blind_id_authenticate_with_private_id_verify(CDATA->id, data_in, len_in, msgbuf, &msgbuflen, &status))
1740 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_verify failed (authentication error)", "Authentication error");
1743 strlcpy(crypto->client_keyfp, pubkeys_fp64[CDATA->c], sizeof(crypto->client_keyfp));
1745 crypto->client_keyfp[0] = 0;
1746 memset(crypto->client_idfp, 0, sizeof(crypto->client_idfp));
1747 fpbuflen = FP64_SIZE;
1748 if(!qd0_blind_id_fingerprint64_public_id(CDATA->id, crypto->client_idfp, &fpbuflen))
1751 return Crypto_ServerError(data_out, len_out, "d0_blind_id_fingerprint64_public_id failed", "Internal error");
1753 fpbuflen = DHKEY_SIZE;
1754 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) dhkey, &fpbuflen))
1757 return Crypto_ServerError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed", "Internal error");
1759 // XOR the two DH keys together to make one
1760 for(i = 0; i < DHKEY_SIZE; ++i)
1761 crypto->dhkey[i] ^= dhkey[i];
1763 // session key is FINISHED (no server part is to be expected)! By this, all keys are set up
1764 crypto->authenticated = true;
1765 CDATA->next_step = 0;
1766 // send a challenge-less challenge
1767 PutWithNul(&data_out_p, len_out, "challenge ");
1768 *len_out = data_out_p - data_out;
1769 --*len_out; // remove NUL terminator
1770 return CRYPTO_MATCH;
1772 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1774 return CRYPTO_NOMATCH;
1777 int Crypto_ServerParsePacket(const char *data_in, size_t len_in, char *data_out, size_t *len_out, lhnetaddress_t *peeraddress)
1781 static double complain_time = 0;
1783 qboolean do_time = false;
1784 qboolean do_reject = false;
1785 if(crypto_servercpupercent.value > 0 || crypto_servercpumaxtime.value > 0)
1786 if(len_in > 5 && !memcmp(data_in, "d0pk\\", 5))
1789 cnt = SearchInfostring(data_in + 4, "cnt");
1791 if(!strcmp(cnt, "0"))
1796 // check if we may perform crypto...
1797 if(crypto_servercpupercent.value > 0)
1799 crypto_servercpu_accumulator += (realtime - crypto_servercpu_lastrealtime) * crypto_servercpupercent.value * 0.01;
1800 if(crypto_servercpumaxtime.value)
1801 if(crypto_servercpu_accumulator > crypto_servercpumaxtime.value)
1802 crypto_servercpu_accumulator = crypto_servercpumaxtime.value;
1806 if(crypto_servercpumaxtime.value > 0)
1807 if(realtime != crypto_servercpu_lastrealtime)
1808 crypto_servercpu_accumulator = crypto_servercpumaxtime.value;
1810 crypto_servercpu_lastrealtime = realtime;
1811 if(do_reject && crypto_servercpu_accumulator < 0)
1813 if(realtime > complain_time + 5)
1814 Con_Printf("crypto: cannot perform requested crypto operations; denial service attack or crypto_servercpupercent/crypto_servercpumaxtime are too low\n");
1816 return CRYPTO_DISCARD;
1818 t = Sys_DoubleTime();
1820 ret = Crypto_ServerParsePacket_Internal(data_in, len_in, data_out, len_out, peeraddress);
1823 t = Sys_DoubleTime() - t;
1824 if(crypto_servercpudebug.integer)
1825 Con_Printf("crypto: accumulator was %.1f ms, used %.1f ms for crypto, ", crypto_servercpu_accumulator * 1000, t * 1000);
1826 crypto_servercpu_accumulator -= t;
1827 if(crypto_servercpudebug.integer)
1828 Con_Printf("is %.1f ms\n", crypto_servercpu_accumulator * 1000);
1833 static int Crypto_ClientError(char *data_out, size_t *len_out, const char *msg)
1835 dpsnprintf(data_out, *len_out, "reject %s", msg);
1836 *len_out = strlen(data_out);
1837 return CRYPTO_REPLACE;
1840 static int Crypto_SoftClientError(char *data_out, size_t *len_out, const char *msg)
1843 Con_Printf("%s\n", msg);
1844 return CRYPTO_DISCARD;
1847 int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out, size_t *len_out, lhnetaddress_t *peeraddress)
1849 crypto_t *crypto = &cls.crypto;
1850 const char *string = data_in;
1853 char *data_out_p = data_out;
1856 if(!d0_blind_id_dll)
1857 return CRYPTO_NOMATCH; // no support
1859 // if "challenge": verify challenge, and discard message, send next crypto protocol message instead
1860 // otherwise, just handle actual protocol messages
1862 if (len_in == 6 && !memcmp(string, "accept", 6) && cls.connect_trying && d0_rijndael_dll)
1864 int wantserverid = -1;
1865 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL);
1866 if(!crypto || !crypto->authenticated)
1868 if(wantserverid >= 0)
1869 return Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present");
1870 if(crypto_aeslevel.integer >= 3)
1871 return Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)");
1873 return CRYPTO_NOMATCH;
1875 else if (len_in >= 1 && string[0] == 'j' && cls.connect_trying && d0_rijndael_dll && crypto_aeslevel.integer >= 3)
1877 int wantserverid = -1;
1878 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL);
1879 if(!crypto || !crypto->authenticated)
1881 if(wantserverid >= 0)
1882 return Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present");
1883 if(crypto_aeslevel.integer >= 3)
1884 return Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)");
1886 return CRYPTO_NOMATCH;
1888 else if (len_in >= 13 && !memcmp(string, "infoResponse\x0A", 13))
1890 s = SearchInfostring(string + 13, "d0_blind_id");
1892 Crypto_StoreHostKey(peeraddress, s, true);
1893 return CRYPTO_NOMATCH;
1895 else if (len_in >= 15 && !memcmp(string, "statusResponse\x0A", 15))
1899 p = strchr(string + 15, '\n');
1903 * (char *) p = 0; // cut off the string there
1905 s = SearchInfostring(string + 15, "d0_blind_id");
1907 Crypto_StoreHostKey(peeraddress, s, true);
1910 * (char *) p = save;
1911 // invoking those nasal demons again (do not run this on the DS9k)
1913 return CRYPTO_NOMATCH;
1915 else if(len_in > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
1917 const char *vlen_blind_id_ptr = NULL;
1918 size_t len_blind_id_ptr = 0;
1920 const char *challenge = data_in + 10;
1923 int clientid = -1, serverid = -1, wantserverid = -1;
1924 qboolean server_can_auth = true;
1925 char wantserver_idfp[FP64_SIZE+1];
1926 int wantserver_aeslevel;
1928 // if we have a stored host key for the server, assume serverid to already be selected!
1929 // (the loop will refuse to overwrite this one then)
1930 wantserver_idfp[0] = 0;
1931 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, wantserver_idfp, sizeof(wantserver_idfp), &wantserver_aeslevel);
1932 // requirement: wantserver_idfp is a full ID if wantserverid set
1934 // if we leave, we have to consider the connection
1935 // unauthenticated; NOTE: this may be faked by a clever
1936 // attacker to force an unauthenticated connection; so we have
1937 // a safeguard check in place when encryption is required too
1938 // in place, or when authentication is required by the server
1939 crypto->authenticated = false;
1941 GetUntilNul(&data_in, &len_in);
1943 return (wantserverid >= 0) ? Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present") :
1944 (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) :
1947 // FTEQW extension protocol
1950 k = Crypto_LittleLong(data_in);
1951 v = Crypto_LittleLong(data_in + 4);
1959 k = Crypto_LittleLong(data_in);
1964 case PROTOCOL_D0_BLIND_ID:
1965 vlen_blind_id_ptr = data_in;
1966 len_blind_id_ptr = v;
1978 if(!vlen_blind_id_ptr)
1979 return (wantserverid >= 0) ? Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though authentication is required") :
1980 (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) :
1983 data_in = vlen_blind_id_ptr;
1984 len_in = len_blind_id_ptr;
1986 // parse fingerprints
1987 // once we found a fingerprint we can auth to (ANY), select it as clientfp
1988 // once we found a fingerprint in the first list that we know, select it as serverfp
1992 p = GetUntilNul(&data_in, &len_in);
1997 if(!server_can_auth)
1998 break; // other protocol message may follow
1999 server_can_auth = false;
2004 for(i = 0; i < MAX_PUBKEYS; ++i)
2007 if(!strcmp(p, pubkeys_fp64[i]))
2009 if(pubkeys_havepriv[i])
2014 if(wantserverid < 0 || i == wantserverid)
2018 if(clientid >= 0 && serverid >= 0)
2022 // if stored host key is not found:
2023 if(wantserverid >= 0 && serverid < 0)
2024 return Crypto_ClientError(data_out, len_out, "Server CA does not match stored host key, refusing to connect");
2026 if(serverid >= 0 || clientid >= 0)
2028 // TODO at this point, fill clientside crypto struct!
2030 CDATA->cdata_id = ++cdata_id;
2031 CDATA->s = serverid;
2032 CDATA->c = clientid;
2033 memset(crypto->dhkey, 0, sizeof(crypto->dhkey));
2034 strlcpy(CDATA->challenge, challenge, sizeof(CDATA->challenge));
2035 crypto->client_keyfp[0] = 0;
2036 crypto->client_idfp[0] = 0;
2037 crypto->server_keyfp[0] = 0;
2038 crypto->server_idfp[0] = 0;
2039 memcpy(CDATA->wantserver_idfp, wantserver_idfp, sizeof(crypto->server_idfp));
2041 if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2042 switch(bound(0, d0_rijndael_dll ? crypto_aeslevel.integer : 0, 3))
2044 default: // dummy, never happens, but to make gcc happy...
2046 if(wantserver_aeslevel >= 3)
2047 return Crypto_ServerError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)", NULL);
2048 CDATA->wantserver_aes = false;
2051 CDATA->wantserver_aes = (wantserver_aeslevel >= 2);
2054 CDATA->wantserver_aes = (wantserver_aeslevel >= 1);
2057 if(wantserver_aeslevel <= 0)
2058 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);
2059 CDATA->wantserver_aes = true;
2063 // build outgoing message
2064 // append regular stuff
2065 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\0\\id\\%d\\aeslevel\\%d\\challenge\\%s", CDATA->cdata_id, d0_rijndael_dll ? crypto_aeslevel.integer : 0, challenge));
2066 PutWithNul(&data_out_p, len_out, serverid >= 0 ? pubkeys_fp64[serverid] : "");
2067 PutWithNul(&data_out_p, len_out, clientid >= 0 ? pubkeys_fp64[clientid] : "");
2071 // I am the client, and my key is ok... so let's set client_keyfp and client_idfp
2072 strlcpy(crypto->client_keyfp, pubkeys_fp64[CDATA->c], sizeof(crypto->client_keyfp));
2073 strlcpy(crypto->client_idfp, pubkeys_priv_fp64[CDATA->c], sizeof(crypto->client_idfp));
2079 CDATA->id = qd0_blind_id_new();
2083 return Crypto_ClientError(data_out, len_out, "d0_blind_id_new failed");
2085 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->s]))
2088 return Crypto_ClientError(data_out, len_out, "d0_blind_id_copy failed");
2090 CDATA->next_step = 1;
2091 *len_out = data_out_p - data_out;
2093 else if(clientid >= 0)
2095 // skip over server auth, perform client auth only
2097 CDATA->id = qd0_blind_id_new();
2101 return Crypto_ClientError(data_out, len_out, "d0_blind_id_new failed");
2103 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
2106 return Crypto_ClientError(data_out, len_out, "d0_blind_id_copy failed");
2108 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
2111 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_start failed");
2113 CDATA->next_step = 5;
2114 data_out_p += *len_out;
2115 *len_out = data_out_p - data_out;
2118 *len_out = data_out_p - data_out;
2120 return CRYPTO_DISCARD;
2124 if(wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2125 if(wantserver_aeslevel >= 3)
2126 return Crypto_ClientError(data_out, len_out, "Server insists on encryption, but neither can authenticate to the other");
2127 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) :
2131 else if(len_in > 5 && !memcmp(string, "d0pk\\", 5) && cls.connect_trying)
2135 cnt = SearchInfostring(string + 4, "id");
2136 id = (cnt ? atoi(cnt) : -1);
2137 cnt = SearchInfostring(string + 4, "cnt");
2139 return Crypto_ClientError(data_out, len_out, "d0pk\\ message without cnt");
2140 GetUntilNul(&data_in, &len_in);
2142 return Crypto_ClientError(data_out, len_out, "d0pk\\ message without attachment");
2144 if(!strcmp(cnt, "1"))
2147 if(CDATA->cdata_id != id)
2148 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
2149 if(CDATA->next_step != 1)
2150 return Crypto_SoftClientError(data_out, len_out, va("Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
2152 cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
2154 if((s = SearchInfostring(string + 4, "aes")))
2158 // we CANNOT toggle the AES status any more!
2159 // as the server already decided
2160 if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2161 if(!aes && CDATA->wantserver_aes)
2164 return Crypto_ClientError(data_out, len_out, "Stored host key requires encryption, but server did not enable encryption");
2166 if(aes && (!d0_rijndael_dll || crypto_aeslevel.integer <= 0))
2169 return Crypto_ClientError(data_out, len_out, "Server insists on encryption too hard");
2171 if(!aes && (d0_rijndael_dll && crypto_aeslevel.integer >= 3))
2174 return Crypto_ClientError(data_out, len_out, "Server insists on plaintext too hard");
2176 crypto->use_aes = aes != 0;
2178 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\2\\id\\%d", CDATA->cdata_id));
2179 if(!qd0_blind_id_authenticate_with_private_id_challenge(CDATA->id, true, false, data_in, len_in, data_out_p, len_out, &status))
2182 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_challenge failed");
2184 CDATA->next_step = 3;
2185 data_out_p += *len_out;
2186 *len_out = data_out_p - data_out;
2187 return CRYPTO_DISCARD;
2189 else if(!strcmp(cnt, "3"))
2191 static char msgbuf[32];
2192 size_t msgbuflen = sizeof(msgbuf);
2196 if(CDATA->cdata_id != id)
2197 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
2198 if(CDATA->next_step != 3)
2199 return Crypto_SoftClientError(data_out, len_out, va("Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
2201 cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
2203 if(!qd0_blind_id_authenticate_with_private_id_verify(CDATA->id, data_in, len_in, msgbuf, &msgbuflen, &status))
2206 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_verify failed (server authentication error)");
2209 strlcpy(crypto->server_keyfp, pubkeys_fp64[CDATA->s], sizeof(crypto->server_keyfp));
2211 crypto->server_keyfp[0] = 0;
2212 memset(crypto->server_idfp, 0, sizeof(crypto->server_idfp));
2213 fpbuflen = FP64_SIZE;
2214 if(!qd0_blind_id_fingerprint64_public_id(CDATA->id, crypto->server_idfp, &fpbuflen))
2217 return Crypto_ClientError(data_out, len_out, "d0_blind_id_fingerprint64_public_id failed");
2219 if(CDATA->wantserver_idfp[0])
2220 if(memcmp(CDATA->wantserver_idfp, crypto->server_idfp, sizeof(crypto->server_idfp)))
2223 return Crypto_ClientError(data_out, len_out, "Server ID does not match stored host key, refusing to connect");
2225 fpbuflen = DHKEY_SIZE;
2226 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) crypto->dhkey, &fpbuflen))
2229 return Crypto_ClientError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed");
2232 // cache the server key
2233 Crypto_StoreHostKey(&cls.connect_address, va("%d %s@%s", crypto->use_aes ? 1 : 0, crypto->server_idfp, pubkeys_fp64[CDATA->s]), false);
2237 // client will auth next
2238 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\4\\id\\%d", CDATA->cdata_id));
2239 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
2242 return Crypto_ClientError(data_out, len_out, "d0_blind_id_copy failed");
2244 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
2247 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_start failed");
2249 CDATA->next_step = 5;
2250 data_out_p += *len_out;
2251 *len_out = data_out_p - data_out;
2252 return CRYPTO_DISCARD;
2256 // session key is FINISHED (no server part is to be expected)! By this, all keys are set up
2257 crypto->authenticated = true;
2258 CDATA->next_step = 0;
2259 // assume we got the empty challenge to finish the protocol
2260 PutWithNul(&data_out_p, len_out, "challenge ");
2261 *len_out = data_out_p - data_out;
2262 --*len_out; // remove NUL terminator
2263 return CRYPTO_REPLACE;
2266 else if(!strcmp(cnt, "5"))
2269 unsigned char dhkey[DHKEY_SIZE];
2273 if(CDATA->cdata_id != id)
2274 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
2275 if(CDATA->next_step != 5)
2276 return Crypto_SoftClientError(data_out, len_out, va("Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
2278 cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
2280 if(CDATA->s < 0) // only if server didn't auth
2282 if((s = SearchInfostring(string + 4, "aes")))
2286 if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2287 if(!aes && CDATA->wantserver_aes)
2290 return Crypto_ClientError(data_out, len_out, "Stored host key requires encryption, but server did not enable encryption");
2292 if(aes && (!d0_rijndael_dll || crypto_aeslevel.integer <= 0))
2295 return Crypto_ClientError(data_out, len_out, "Server insists on encryption too hard");
2297 if(!aes && (d0_rijndael_dll && crypto_aeslevel.integer >= 3))
2300 return Crypto_ClientError(data_out, len_out, "Server insists on plaintext too hard");
2302 crypto->use_aes = aes != 0;
2305 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\6\\id\\%d", CDATA->cdata_id));
2306 if(!qd0_blind_id_authenticate_with_private_id_response(CDATA->id, data_in, len_in, data_out_p, len_out))
2309 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_response failed");
2311 fpbuflen = DHKEY_SIZE;
2312 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) dhkey, &fpbuflen))
2315 return Crypto_ClientError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed");
2317 // XOR the two DH keys together to make one
2318 for(i = 0; i < DHKEY_SIZE; ++i)
2319 crypto->dhkey[i] ^= dhkey[i];
2320 // session key is FINISHED! By this, all keys are set up
2321 crypto->authenticated = true;
2322 CDATA->next_step = 0;
2323 data_out_p += *len_out;
2324 *len_out = data_out_p - data_out;
2325 return CRYPTO_DISCARD;
2327 return Crypto_SoftClientError(data_out, len_out, "Got unknown d0_blind_id message from server");
2330 return CRYPTO_NOMATCH;
2333 size_t Crypto_SignData(const void *data, size_t datasize, int keyid, void *signed_data, size_t signed_size)
2335 if(keyid < 0 || keyid >= MAX_PUBKEYS)
2337 if(!pubkeys_havepriv[keyid])
2339 if(qd0_blind_id_sign_with_private_id_sign(pubkeys[keyid], true, false, (const char *)data, datasize, (char *)signed_data, &signed_size))