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
146 #define qd0_blind_id_sign_with_private_id_sign_detached d0_blind_id_sign_with_private_id_sign_detached
150 // d0_blind_id interface
153 #define D0_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
155 #define D0_WARN_UNUSED_RESULT
159 typedef struct d0_blind_id_s d0_blind_id_t;
160 typedef D0_BOOL (*d0_fastreject_function) (const d0_blind_id_t *ctx, void *pass);
161 static D0_EXPORT D0_WARN_UNUSED_RESULT d0_blind_id_t *(*qd0_blind_id_new) (void);
162 static D0_EXPORT void (*qd0_blind_id_free) (d0_blind_id_t *a);
163 //static D0_EXPORT void (*qd0_blind_id_clear) (d0_blind_id_t *ctx);
164 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_copy) (d0_blind_id_t *ctx, const d0_blind_id_t *src);
165 //static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_generate_private_key) (d0_blind_id_t *ctx, int k);
166 //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);
167 //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);
168 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);
169 //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);
170 //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);
171 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);
172 //static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_generate_private_id_modulus) (d0_blind_id_t *ctx);
173 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);
174 //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);
175 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_generate_private_id_start) (d0_blind_id_t *ctx);
176 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);
177 //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);
178 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);
179 //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);
180 //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);
181 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);
182 //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);
183 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);
184 //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);
185 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);
186 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);
187 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);
188 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);
189 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);
190 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
191 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_INITIALIZE) (void);
192 static D0_EXPORT void (*qd0_blind_id_SHUTDOWN) (void);
193 static D0_EXPORT void (*qd0_blind_id_util_sha256) (char *out, const char *in, size_t n);
194 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);
195 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);
196 static dllfunction_t d0_blind_id_funcs[] =
198 {"d0_blind_id_new", (void **) &qd0_blind_id_new},
199 {"d0_blind_id_free", (void **) &qd0_blind_id_free},
200 //{"d0_blind_id_clear", (void **) &qd0_blind_id_clear},
201 {"d0_blind_id_copy", (void **) &qd0_blind_id_copy},
202 //{"d0_blind_id_generate_private_key", (void **) &qd0_blind_id_generate_private_key},
203 //{"d0_blind_id_generate_private_key_fastreject", (void **) &qd0_blind_id_generate_private_key_fastreject},
204 //{"d0_blind_id_read_private_key", (void **) &qd0_blind_id_read_private_key},
205 {"d0_blind_id_read_public_key", (void **) &qd0_blind_id_read_public_key},
206 //{"d0_blind_id_write_private_key", (void **) &qd0_blind_id_write_private_key},
207 //{"d0_blind_id_write_public_key", (void **) &qd0_blind_id_write_public_key},
208 {"d0_blind_id_fingerprint64_public_key", (void **) &qd0_blind_id_fingerprint64_public_key},
209 //{"d0_blind_id_generate_private_id_modulus", (void **) &qd0_blind_id_generate_private_id_modulus},
210 {"d0_blind_id_read_private_id_modulus", (void **) &qd0_blind_id_read_private_id_modulus},
211 //{"d0_blind_id_write_private_id_modulus", (void **) &qd0_blind_id_write_private_id_modulus},
212 {"d0_blind_id_generate_private_id_start", (void **) &qd0_blind_id_generate_private_id_start},
213 {"d0_blind_id_generate_private_id_request", (void **) &qd0_blind_id_generate_private_id_request},
214 //{"d0_blind_id_answer_private_id_request", (void **) &qd0_blind_id_answer_private_id_request},
215 {"d0_blind_id_finish_private_id_request", (void **) &qd0_blind_id_finish_private_id_request},
216 //{"d0_blind_id_read_private_id_request_camouflage", (void **) &qd0_blind_id_read_private_id_request_camouflage},
217 //{"d0_blind_id_write_private_id_request_camouflage", (void **) &qd0_blind_id_write_private_id_request_camouflage},
218 {"d0_blind_id_read_private_id", (void **) &qd0_blind_id_read_private_id},
219 //{"d0_blind_id_read_public_id", (void **) &qd0_blind_id_read_public_id},
220 {"d0_blind_id_write_private_id", (void **) &qd0_blind_id_write_private_id},
221 //{"d0_blind_id_write_public_id", (void **) &qd0_blind_id_write_public_id},
222 {"d0_blind_id_authenticate_with_private_id_start", (void **) &qd0_blind_id_authenticate_with_private_id_start},
223 {"d0_blind_id_authenticate_with_private_id_challenge", (void **) &qd0_blind_id_authenticate_with_private_id_challenge},
224 {"d0_blind_id_authenticate_with_private_id_response", (void **) &qd0_blind_id_authenticate_with_private_id_response},
225 {"d0_blind_id_authenticate_with_private_id_verify", (void **) &qd0_blind_id_authenticate_with_private_id_verify},
226 {"d0_blind_id_fingerprint64_public_id", (void **) &qd0_blind_id_fingerprint64_public_id},
227 {"d0_blind_id_sessionkey_public_id", (void **) &qd0_blind_id_sessionkey_public_id},
228 {"d0_blind_id_INITIALIZE", (void **) &qd0_blind_id_INITIALIZE},
229 {"d0_blind_id_SHUTDOWN", (void **) &qd0_blind_id_SHUTDOWN},
230 {"d0_blind_id_util_sha256", (void **) &qd0_blind_id_util_sha256},
231 {"d0_blind_id_sign_with_private_id_sign", (void **) &qd0_blind_id_sign_with_private_id_sign},
232 {"d0_blind_id_sign_with_private_id_sign_detached", (void **) &qd0_blind_id_sign_with_private_id_sign_detached},
235 // end of d0_blind_id interface
237 static dllhandle_t d0_blind_id_dll = NULL;
238 static qboolean Crypto_OpenLibrary (void)
240 const char* dllnames [] =
243 "libd0_blind_id-0.dll",
244 #elif defined(MACOSX)
245 "libd0_blind_id.0.dylib",
247 "libd0_blind_id.so.0",
248 "libd0_blind_id.so", // FreeBSD
258 return Sys_LoadLibrary (dllnames, &d0_blind_id_dll, d0_blind_id_funcs);
261 static void Crypto_CloseLibrary (void)
263 Sys_UnloadLibrary (&d0_blind_id_dll);
268 #ifdef CRYPTO_RIJNDAEL_STATIC
270 #include <d0_blind_id/d0_rijndael.h>
272 #define d0_rijndael_dll 1
273 #define Crypto_Rijndael_OpenLibrary() true
274 #define Crypto_Rijndael_CloseLibrary()
276 #define qd0_rijndael_setup_encrypt d0_rijndael_setup_encrypt
277 #define qd0_rijndael_setup_decrypt d0_rijndael_setup_decrypt
278 #define qd0_rijndael_encrypt d0_rijndael_encrypt
279 #define qd0_rijndael_decrypt d0_rijndael_decrypt
283 // no need to do the #define dance here, as the upper part declares out macros either way
285 D0_EXPORT int (*qd0_rijndael_setup_encrypt) (unsigned long *rk, const unsigned char *key,
287 D0_EXPORT int (*qd0_rijndael_setup_decrypt) (unsigned long *rk, const unsigned char *key,
289 D0_EXPORT void (*qd0_rijndael_encrypt) (const unsigned long *rk, int nrounds,
290 const unsigned char plaintext[16], unsigned char ciphertext[16]);
291 D0_EXPORT void (*qd0_rijndael_decrypt) (const unsigned long *rk, int nrounds,
292 const unsigned char ciphertext[16], unsigned char plaintext[16]);
293 #define D0_RIJNDAEL_KEYLENGTH(keybits) ((keybits)/8)
294 #define D0_RIJNDAEL_RKLENGTH(keybits) ((keybits)/8+28)
295 #define D0_RIJNDAEL_NROUNDS(keybits) ((keybits)/32+6)
296 static dllfunction_t d0_rijndael_funcs[] =
298 {"d0_rijndael_setup_decrypt", (void **) &qd0_rijndael_setup_decrypt},
299 {"d0_rijndael_setup_encrypt", (void **) &qd0_rijndael_setup_encrypt},
300 {"d0_rijndael_decrypt", (void **) &qd0_rijndael_decrypt},
301 {"d0_rijndael_encrypt", (void **) &qd0_rijndael_encrypt},
304 // end of d0_blind_id interface
306 static dllhandle_t d0_rijndael_dll = NULL;
307 static qboolean Crypto_Rijndael_OpenLibrary (void)
309 const char* dllnames [] =
312 "libd0_rijndael-0.dll",
313 #elif defined(MACOSX)
314 "libd0_rijndael.0.dylib",
316 "libd0_rijndael.so.0",
317 "libd0_rijndael.so", // FreeBSD
327 return Sys_LoadLibrary (dllnames, &d0_rijndael_dll, d0_rijndael_funcs);
330 static void Crypto_Rijndael_CloseLibrary (void)
332 Sys_UnloadLibrary (&d0_rijndael_dll);
338 void sha256(unsigned char *out, const unsigned char *in, int n)
340 qd0_blind_id_util_sha256((char *) out, (const char *) in, n);
343 static size_t Crypto_LoadFile(const char *path, char *buf, size_t nmax)
348 f = FS_SysOpen(va("%s%s", fs_userdir, path), "rb", false);
350 f = FS_SysOpen(va("%s%s", fs_basedir, path), "rb", false);
353 n = FS_Read(f, buf, nmax);
360 static qboolean PutWithNul(char **data, size_t *len, const char *str)
362 // invariant: data points to insertion point
363 size_t l = strlen(str);
366 memcpy(*data, str, l+1);
372 static const char *GetUntilNul(const char **data, size_t *len)
374 // invariant: data points to next character to take
375 const char *data_save = *data;
388 p = (const char *) memchr(*data, 0, *len);
389 if(!p) // no terminating NUL
402 return (const char *) data_save;
409 static d0_blind_id_t *Crypto_ReadPublicKey(char *buf, size_t len)
411 d0_blind_id_t *pk = NULL;
414 if(Crypto_ParsePack(buf, len, FOURCC_D0PK, p, l, 2))
416 pk = qd0_blind_id_new();
418 if(qd0_blind_id_read_public_key(pk, p[0], l[0]))
419 if(qd0_blind_id_read_private_id_modulus(pk, p[1], l[1]))
423 qd0_blind_id_free(pk);
428 static qboolean Crypto_AddPrivateKey(d0_blind_id_t *pk, char *buf, size_t len)
432 if(Crypto_ParsePack(buf, len, FOURCC_D0SI, p, l, 1))
434 if(qd0_blind_id_read_private_id(pk, p[0], l[0]))
440 #define MAX_PUBKEYS 16
441 static d0_blind_id_t *pubkeys[MAX_PUBKEYS];
442 static char pubkeys_fp64[MAX_PUBKEYS][FP64_SIZE+1];
443 static qboolean pubkeys_havepriv[MAX_PUBKEYS];
444 static char pubkeys_priv_fp64[MAX_PUBKEYS][FP64_SIZE+1];
445 static char challenge_append[1400];
446 static size_t challenge_append_length;
448 static int keygen_i = -1;
449 static char keygen_buf[8192];
451 #define MAX_CRYPTOCONNECTS 16
452 #define CRYPTOCONNECT_NONE 0
453 #define CRYPTOCONNECT_PRECONNECT 1
454 #define CRYPTOCONNECT_CONNECT 2
455 #define CRYPTOCONNECT_RECONNECT 3
456 #define CRYPTOCONNECT_DUPLICATE 4
457 typedef struct server_cryptoconnect_s
460 lhnetaddress_t address;
464 server_cryptoconnect_t;
465 static server_cryptoconnect_t cryptoconnects[MAX_CRYPTOCONNECTS];
467 static int cdata_id = 0;
473 char challenge[2048];
474 char wantserver_idfp[FP64_SIZE+1];
475 qboolean wantserver_aes;
480 // crypto specific helpers
481 #define CDATA ((crypto_data_t *) crypto->data)
482 #define MAKE_CDATA if(!crypto->data) crypto->data = Z_Malloc(sizeof(crypto_data_t))
483 #define CLEAR_CDATA if(crypto->data) { if(CDATA->id) qd0_blind_id_free(CDATA->id); Z_Free(crypto->data); } crypto->data = NULL
485 static crypto_t *Crypto_ServerFindInstance(lhnetaddress_t *peeraddress, qboolean allow_create)
491 return NULL; // no support
493 for(i = 0; i < MAX_CRYPTOCONNECTS; ++i)
494 if(LHNETADDRESS_Compare(peeraddress, &cryptoconnects[i].address))
496 if(i < MAX_CRYPTOCONNECTS && (allow_create || cryptoconnects[i].crypto.data))
498 crypto = &cryptoconnects[i].crypto;
499 cryptoconnects[i].lasttime = realtime;
505 for(i = 1; i < MAX_CRYPTOCONNECTS; ++i)
506 if(cryptoconnects[i].lasttime < cryptoconnects[best].lasttime)
508 crypto = &cryptoconnects[best].crypto;
509 cryptoconnects[best].lasttime = realtime;
510 memcpy(&cryptoconnects[best].address, peeraddress, sizeof(cryptoconnects[best].address));
515 qboolean Crypto_ServerFinishInstance(crypto_t *out, crypto_t *crypto)
517 // no check needed here (returned pointers are only used in prefilled fields)
518 if(!crypto || !crypto->authenticated)
520 Con_Printf("Passed an invalid crypto connect instance\n");
521 memset(out, 0, sizeof(*out));
525 memcpy(out, crypto, sizeof(*out));
526 memset(crypto, 0, sizeof(crypto));
530 crypto_t *Crypto_ServerGetInstance(lhnetaddress_t *peeraddress)
532 // no check needed here (returned pointers are only used in prefilled fields)
533 return Crypto_ServerFindInstance(peeraddress, false);
536 typedef struct crypto_storedhostkey_s
538 struct crypto_storedhostkey_s *next;
541 char idfp[FP64_SIZE+1];
544 crypto_storedhostkey_t;
545 static crypto_storedhostkey_t *crypto_storedhostkey_hashtable[CRYPTO_HOSTKEY_HASHSIZE];
547 static void Crypto_InitHostKeys(void)
550 for(i = 0; i < CRYPTO_HOSTKEY_HASHSIZE; ++i)
551 crypto_storedhostkey_hashtable[i] = NULL;
554 static void Crypto_ClearHostKeys(void)
557 crypto_storedhostkey_t *hk, *hkn;
558 for(i = 0; i < CRYPTO_HOSTKEY_HASHSIZE; ++i)
560 for(hk = crypto_storedhostkey_hashtable[i]; hk; hk = hkn)
565 crypto_storedhostkey_hashtable[i] = NULL;
569 static qboolean Crypto_ClearHostKey(lhnetaddress_t *peeraddress)
573 crypto_storedhostkey_t **hkp;
574 qboolean found = false;
576 LHNETADDRESS_ToString(peeraddress, buf, sizeof(buf), 1);
577 hashindex = CRC_Block((const unsigned char *) buf, strlen(buf)) % CRYPTO_HOSTKEY_HASHSIZE;
578 for(hkp = &crypto_storedhostkey_hashtable[hashindex]; *hkp && LHNETADDRESS_Compare(&((*hkp)->addr), peeraddress); hkp = &((*hkp)->next));
582 crypto_storedhostkey_t *hk = *hkp;
591 static void Crypto_StoreHostKey(lhnetaddress_t *peeraddress, const char *keystring, qboolean complain)
595 crypto_storedhostkey_t *hk;
597 char idfp[FP64_SIZE+1];
603 // syntax of keystring:
604 // aeslevel id@key id@key ...
608 aeslevel = bound(0, *keystring - '0', 3);
609 while(*keystring && *keystring != ' ')
613 while(*keystring && keyid < 0)
616 const char *idstart, *idend, *keystart, *keyend;
617 ++keystring; // skip the space
619 while(*keystring && *keystring != ' ' && *keystring != '@')
625 keystart = keystring;
626 while(*keystring && *keystring != ' ')
630 if(idend - idstart == FP64_SIZE && keyend - keystart == FP64_SIZE)
632 for(keyid = 0; keyid < MAX_PUBKEYS; ++keyid)
634 if(!memcmp(pubkeys_fp64[keyid], keystart, FP64_SIZE))
636 memcpy(idfp, idstart, FP64_SIZE);
640 if(keyid >= MAX_PUBKEYS)
648 LHNETADDRESS_ToString(peeraddress, buf, sizeof(buf), 1);
649 hashindex = CRC_Block((const unsigned char *) buf, strlen(buf)) % CRYPTO_HOSTKEY_HASHSIZE;
650 for(hk = crypto_storedhostkey_hashtable[hashindex]; hk && LHNETADDRESS_Compare(&hk->addr, peeraddress); hk = hk->next);
656 if(hk->keyid != keyid || memcmp(hk->idfp, idfp, FP64_SIZE+1))
657 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);
658 if(hk->aeslevel > aeslevel)
659 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);
661 hk->aeslevel = max(aeslevel, hk->aeslevel);
665 // great, we did NOT have it yet
666 hk = (crypto_storedhostkey_t *) Z_Malloc(sizeof(*hk));
667 memcpy(&hk->addr, peeraddress, sizeof(hk->addr));
669 memcpy(hk->idfp, idfp, FP64_SIZE+1);
670 hk->next = crypto_storedhostkey_hashtable[hashindex];
671 hk->aeslevel = aeslevel;
672 crypto_storedhostkey_hashtable[hashindex] = hk;
675 qboolean Crypto_RetrieveHostKey(lhnetaddress_t *peeraddress, int *keyid, char *keyfp, size_t keyfplen, char *idfp, size_t idfplen, int *aeslevel)
679 crypto_storedhostkey_t *hk;
684 LHNETADDRESS_ToString(peeraddress, buf, sizeof(buf), 1);
685 hashindex = CRC_Block((const unsigned char *) buf, strlen(buf)) % CRYPTO_HOSTKEY_HASHSIZE;
686 for(hk = crypto_storedhostkey_hashtable[hashindex]; hk && LHNETADDRESS_Compare(&hk->addr, peeraddress); hk = hk->next);
694 strlcpy(keyfp, pubkeys_fp64[hk->keyid], keyfplen);
696 strlcpy(idfp, hk->idfp, idfplen);
698 *aeslevel = hk->aeslevel;
702 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
704 if(keyid < 0 || keyid >= MAX_PUBKEYS)
713 strlcpy(keyfp, pubkeys_fp64[keyid], keyfplen);
715 if(pubkeys_havepriv[keyid])
716 strlcpy(idfp, pubkeys_priv_fp64[keyid], keyfplen);
721 // init/shutdown code
722 static void Crypto_BuildChallengeAppend(void)
724 char *p, *lengthptr, *startptr;
727 p = challenge_append;
728 n = sizeof(challenge_append);
729 Crypto_UnLittleLong(p, PROTOCOL_VLEN);
733 Crypto_UnLittleLong(p, 0);
736 Crypto_UnLittleLong(p, PROTOCOL_D0_BLIND_ID);
740 for(i = 0; i < MAX_PUBKEYS; ++i)
741 if(pubkeys_havepriv[i])
742 PutWithNul(&p, &n, pubkeys_fp64[i]);
743 PutWithNul(&p, &n, "");
744 for(i = 0; i < MAX_PUBKEYS; ++i)
745 if(!pubkeys_havepriv[i] && pubkeys[i])
746 PutWithNul(&p, &n, pubkeys_fp64[i]);
747 Crypto_UnLittleLong(lengthptr, p - startptr);
748 challenge_append_length = p - challenge_append;
751 static void Crypto_LoadKeys(void)
758 // note: we are just a CLIENT
760 // PUBLIC KEYS to accept (including modulus)
761 // PRIVATE KEY of user
763 crypto_idstring = NULL;
764 dpsnprintf(crypto_idstring_buf, sizeof(crypto_idstring_buf), "%d", d0_rijndael_dll ? crypto_aeslevel.integer : 0);
765 for(i = 0; i < MAX_PUBKEYS; ++i)
767 memset(pubkeys_fp64[i], 0, sizeof(pubkeys_fp64[i]));
768 memset(pubkeys_priv_fp64[i], 0, sizeof(pubkeys_fp64[i]));
769 pubkeys_havepriv[i] = false;
770 len = Crypto_LoadFile(va("key_%d.d0pk", i), buf, sizeof(buf));
771 if((pubkeys[i] = Crypto_ReadPublicKey(buf, len)))
774 if(qd0_blind_id_fingerprint64_public_key(pubkeys[i], pubkeys_fp64[i], &len2)) // keeps final NUL
776 Con_Printf("Loaded public key key_%d.d0pk (fingerprint: %s)\n", i, pubkeys_fp64[i]);
777 len = Crypto_LoadFile(va("key_%d.d0si", i), buf, sizeof(buf));
780 if(Crypto_AddPrivateKey(pubkeys[i], buf, len))
783 if(qd0_blind_id_fingerprint64_public_id(pubkeys[i], pubkeys_priv_fp64[i], &len2)) // keeps final NUL
785 Con_Printf("Loaded private ID key_%d.d0si for key_%d.d0pk (fingerprint: %s)\n", i, i, pubkeys_priv_fp64[i]);
786 pubkeys_havepriv[i] = true;
787 strlcat(crypto_idstring_buf, va(" %s@%s", pubkeys_priv_fp64[i], pubkeys_fp64[i]), sizeof(crypto_idstring_buf));
791 // can't really happen
792 // but nothing leaked here
799 // can't really happen
800 qd0_blind_id_free(pubkeys[i]);
805 crypto_idstring = crypto_idstring_buf;
808 Crypto_BuildChallengeAppend();
810 // find a good prefix length for all the keys we know (yes, algorithm is not perfect yet, may yield too long prefix length)
811 crypto_keyfp_recommended_length = 0;
812 memset(buf+256, 0, MAX_PUBKEYS + MAX_PUBKEYS);
813 while(crypto_keyfp_recommended_length < FP64_SIZE)
816 for(i = 0; i < MAX_PUBKEYS; ++i)
820 ++buf[(unsigned char) pubkeys_fp64[i][crypto_keyfp_recommended_length]];
821 if(pubkeys_havepriv[i])
822 if(!buf[256 + MAX_PUBKEYS + i])
823 ++buf[(unsigned char) pubkeys_priv_fp64[i][crypto_keyfp_recommended_length]];
825 for(i = 0; i < MAX_PUBKEYS; ++i)
829 if(buf[(unsigned char) pubkeys_fp64[i][crypto_keyfp_recommended_length]] < 2)
831 if(pubkeys_havepriv[i])
832 if(!buf[256 + MAX_PUBKEYS + i])
833 if(buf[(unsigned char) pubkeys_priv_fp64[i][crypto_keyfp_recommended_length]] < 2)
834 buf[256 + MAX_PUBKEYS + i] = 1;
836 ++crypto_keyfp_recommended_length;
837 for(i = 0; i < MAX_PUBKEYS; ++i)
842 if(pubkeys_havepriv[i])
843 if(!buf[256 + MAX_PUBKEYS + i])
849 if(crypto_keyfp_recommended_length < 7)
850 crypto_keyfp_recommended_length = 7;
853 static void Crypto_UnloadKeys(void)
857 for(i = 0; i < MAX_PUBKEYS; ++i)
860 qd0_blind_id_free(pubkeys[i]);
862 pubkeys_havepriv[i] = false;
863 memset(pubkeys_fp64[i], 0, sizeof(pubkeys_fp64[i]));
864 memset(pubkeys_priv_fp64[i], 0, sizeof(pubkeys_fp64[i]));
865 challenge_append_length = 0;
867 crypto_idstring = NULL;
870 void Crypto_Shutdown(void)
875 Crypto_Rijndael_CloseLibrary();
880 for(i = 0; i < MAX_CRYPTOCONNECTS; ++i)
882 crypto = &cryptoconnects[i].crypto;
885 memset(cryptoconnects, 0, sizeof(cryptoconnects));
886 crypto = &cls.crypto;
891 qd0_blind_id_SHUTDOWN();
893 Crypto_CloseLibrary();
897 void Crypto_Init(void)
899 if(!Crypto_OpenLibrary())
902 if(!qd0_blind_id_INITIALIZE())
904 Crypto_Rijndael_CloseLibrary();
905 Crypto_CloseLibrary();
906 Con_Printf("libd0_blind_id initialization FAILED, cryptography support has been disabled\n");
910 Crypto_Rijndael_OpenLibrary(); // if this fails, it's uncritical
912 Crypto_InitHostKeys();
918 static void Crypto_KeyGen_Finished(int code, size_t length_received, unsigned char *buffer, void *cbdata)
922 static char buf[8192];
923 static char buf2[8192];
924 size_t bufsize, buf2size;
926 d0_blind_id_t *ctx, *ctx2;
932 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
937 if(keygen_i >= MAX_PUBKEYS || !pubkeys[keygen_i])
939 Con_Printf("overflow of keygen_i\n");
945 Con_Printf("Unexpected response from keygen server:\n");
946 Com_HexDumpToConsole(buffer, length_received);
949 if(!Crypto_ParsePack((const char *) buffer, length_received, FOURCC_D0IR, p, l, 1))
951 if(length_received >= 5 && Crypto_LittleLong((const char *) buffer) == FOURCC_D0ER)
953 Con_Printf("Error response from keygen server: %.*s\n", (int)(length_received - 5), buffer + 5);
957 Con_Printf("Invalid response from keygen server:\n");
958 Com_HexDumpToConsole(buffer, length_received);
963 if(!qd0_blind_id_finish_private_id_request(pubkeys[keygen_i], p[0], l[0]))
965 Con_Printf("d0_blind_id_finish_private_id_request failed\n");
970 // verify the key we just got (just in case)
971 ctx = qd0_blind_id_new();
974 Con_Printf("d0_blind_id_new failed\n");
978 ctx2 = qd0_blind_id_new();
981 Con_Printf("d0_blind_id_new failed\n");
982 qd0_blind_id_free(ctx);
986 if(!qd0_blind_id_copy(ctx, pubkeys[keygen_i]))
988 Con_Printf("d0_blind_id_copy failed\n");
989 qd0_blind_id_free(ctx);
990 qd0_blind_id_free(ctx2);
994 if(!qd0_blind_id_copy(ctx2, pubkeys[keygen_i]))
996 Con_Printf("d0_blind_id_copy failed\n");
997 qd0_blind_id_free(ctx);
998 qd0_blind_id_free(ctx2);
1002 bufsize = sizeof(buf);
1003 if(!qd0_blind_id_authenticate_with_private_id_start(ctx, 1, 1, "hello world", 11, buf, &bufsize))
1005 Con_Printf("d0_blind_id_authenticate_with_private_id_start failed\n");
1006 qd0_blind_id_free(ctx);
1007 qd0_blind_id_free(ctx2);
1011 buf2size = sizeof(buf2);
1012 if(!qd0_blind_id_authenticate_with_private_id_challenge(ctx2, 1, 1, buf, bufsize, buf2, &buf2size, &status) || !status)
1014 Con_Printf("d0_blind_id_authenticate_with_private_id_challenge failed (server does not have the requested private key)\n");
1015 qd0_blind_id_free(ctx);
1016 qd0_blind_id_free(ctx2);
1020 bufsize = sizeof(buf);
1021 if(!qd0_blind_id_authenticate_with_private_id_response(ctx, buf2, buf2size, buf, &bufsize))
1023 Con_Printf("d0_blind_id_authenticate_with_private_id_response failed\n");
1024 qd0_blind_id_free(ctx);
1025 qd0_blind_id_free(ctx2);
1029 buf2size = sizeof(buf2);
1030 if(!qd0_blind_id_authenticate_with_private_id_verify(ctx2, buf, bufsize, buf2, &buf2size, &status) || !status)
1032 Con_Printf("d0_blind_id_authenticate_with_private_id_verify failed (server does not have the requested private key)\n");
1033 qd0_blind_id_free(ctx);
1034 qd0_blind_id_free(ctx2);
1038 qd0_blind_id_free(ctx);
1039 qd0_blind_id_free(ctx2);
1041 // we have a valid key now!
1042 // make the rest of crypto.c know that
1044 if(qd0_blind_id_fingerprint64_public_id(pubkeys[keygen_i], pubkeys_priv_fp64[keygen_i], &len2)) // keeps final NUL
1046 Con_Printf("Received private ID key_%d.d0pk (fingerprint: %s)\n", keygen_i, pubkeys_priv_fp64[keygen_i]);
1047 pubkeys_havepriv[keygen_i] = true;
1048 strlcat(crypto_idstring_buf, va(" %s@%s", pubkeys_priv_fp64[keygen_i], pubkeys_fp64[keygen_i]), sizeof(crypto_idstring_buf));
1049 crypto_idstring = crypto_idstring_buf;
1050 Crypto_BuildChallengeAppend();
1052 // write the key to disk
1055 if(!qd0_blind_id_write_private_id(pubkeys[keygen_i], buf, &l[0]))
1057 Con_Printf("d0_blind_id_write_private_id failed\n");
1061 if(!(buf2size = Crypto_UnParsePack(buf2, sizeof(buf2), FOURCC_D0SI, p, l, 1)))
1063 Con_Printf("Crypto_UnParsePack failed\n");
1070 FS_CreatePath(va("%skey_%d.d0si", fs_userdir, keygen_i));
1071 f = FS_SysOpen(va("%skey_%d.d0si", fs_userdir, keygen_i), "wb", false);
1075 FS_CreatePath(va("%skey_%d.d0si", fs_basedir, keygen_i));
1076 f = FS_SysOpen(va("%skey_%d.d0si", fs_basedir, keygen_i), "wb", false);
1080 Con_Printf("Cannot open key_%d.d0si\n", keygen_i);
1084 FS_Write(f, buf2, buf2size);
1087 Con_Printf("Saved to key_%d.d0si\n", keygen_i);
1091 static void Crypto_KeyGen_f(void)
1096 static char buf[8192];
1097 static char buf2[8192];
1098 size_t buf2l, buf2pos;
1099 if(!d0_blind_id_dll)
1101 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1106 Con_Printf("usage:\n%s id url\n", Cmd_Argv(0));
1109 i = atoi(Cmd_Argv(1));
1112 Con_Printf("there is no public key %d\n", i);
1115 if(pubkeys_havepriv[i])
1117 Con_Printf("there is already a private key for %d\n", i);
1122 Con_Printf("there is already a keygen run on the way\n");
1126 if(!qd0_blind_id_generate_private_id_start(pubkeys[keygen_i]))
1128 Con_Printf("d0_blind_id_start failed\n");
1134 if(!qd0_blind_id_generate_private_id_request(pubkeys[keygen_i], buf, &l[0]))
1136 Con_Printf("d0_blind_id_generate_private_id_request failed\n");
1140 buf2pos = strlen(Cmd_Argv(2));
1141 memcpy(buf2, Cmd_Argv(2), buf2pos);
1142 if(!(buf2l = Crypto_UnParsePack(buf2 + buf2pos, sizeof(buf2) - buf2pos - 1, FOURCC_D0IQ, p, l, 1)))
1144 Con_Printf("Crypto_UnParsePack failed\n");
1148 if(!(buf2l = base64_encode((unsigned char *) (buf2 + buf2pos), buf2l, sizeof(buf2) - buf2pos - 1)))
1150 Con_Printf("base64_encode failed\n");
1156 if(!Curl_Begin_ToMemory(buf2, 0, (unsigned char *) keygen_buf, sizeof(keygen_buf), Crypto_KeyGen_Finished, NULL))
1158 Con_Printf("curl failed\n");
1162 Con_Printf("key generation in progress\n");
1167 static void Crypto_Reload_f(void)
1169 Crypto_ClearHostKeys();
1170 Crypto_UnloadKeys();
1174 static void Crypto_Keys_f(void)
1177 if(!d0_blind_id_dll)
1179 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1182 for(i = 0; i < MAX_PUBKEYS; ++i)
1186 Con_Printf("%2d: public key key_%d.d0pk (fingerprint: %s)\n", i, i, pubkeys_fp64[i]);
1187 if(pubkeys_havepriv[i])
1188 Con_Printf(" private ID key_%d.d0si (fingerprint: %s)\n", i, pubkeys_priv_fp64[i]);
1193 static void Crypto_HostKeys_f(void)
1196 crypto_storedhostkey_t *hk;
1199 if(!d0_blind_id_dll)
1201 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1204 for(i = 0; i < CRYPTO_HOSTKEY_HASHSIZE; ++i)
1206 for(hk = crypto_storedhostkey_hashtable[i]; hk; hk = hk->next)
1208 LHNETADDRESS_ToString(&hk->addr, buf, sizeof(buf), 1);
1209 Con_Printf("%d %s@%.*s %s\n",
1212 crypto_keyfp_recommended_length, pubkeys_fp64[hk->keyid],
1218 static void Crypto_HostKey_Clear_f(void)
1220 lhnetaddress_t addr;
1223 if(!d0_blind_id_dll)
1225 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1229 for(i = 1; i < Cmd_Argc(); ++i)
1231 LHNETADDRESS_FromString(&addr, Cmd_Argv(i), 26000);
1232 if(Crypto_ClearHostKey(&addr))
1234 Con_Printf("cleared host key for %s\n", Cmd_Argv(i));
1239 void Crypto_Init_Commands(void)
1243 Cmd_AddCommand("crypto_reload", Crypto_Reload_f, "reloads cryptographic keys");
1244 Cmd_AddCommand("crypto_keygen", Crypto_KeyGen_f, "generates and saves a cryptographic key");
1245 Cmd_AddCommand("crypto_keys", Crypto_Keys_f, "lists the loaded keys");
1246 Cmd_AddCommand("crypto_hostkeys", Crypto_HostKeys_f, "lists the cached host keys");
1247 Cmd_AddCommand("crypto_hostkey_clear", Crypto_HostKey_Clear_f, "clears a cached host key");
1248 Cvar_RegisterVariable(&crypto_developer);
1250 Cvar_RegisterVariable(&crypto_aeslevel);
1252 crypto_aeslevel.integer = 0; // make sure
1253 Cvar_RegisterVariable(&crypto_servercpupercent);
1254 Cvar_RegisterVariable(&crypto_servercpumaxtime);
1255 Cvar_RegisterVariable(&crypto_servercpudebug);
1261 static void aescpy(unsigned char *key, const unsigned char *iv, unsigned char *dst, const unsigned char *src, size_t len)
1263 const unsigned char *xorpos = iv;
1264 unsigned char xorbuf[16];
1265 unsigned long rk[D0_RIJNDAEL_RKLENGTH(DHKEY_SIZE * 8)];
1267 qd0_rijndael_setup_encrypt(rk, key, DHKEY_SIZE * 8);
1270 for(i = 0; i < 16; ++i)
1271 xorbuf[i] = src[i] ^ xorpos[i];
1272 qd0_rijndael_encrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), xorbuf, dst);
1280 for(i = 0; i < len; ++i)
1281 xorbuf[i] = src[i] ^ xorpos[i];
1283 xorbuf[i] = xorpos[i];
1284 qd0_rijndael_encrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), xorbuf, dst);
1287 static void seacpy(unsigned char *key, const unsigned char *iv, unsigned char *dst, const unsigned char *src, size_t len)
1289 const unsigned char *xorpos = iv;
1290 unsigned char xorbuf[16];
1291 unsigned long rk[D0_RIJNDAEL_RKLENGTH(DHKEY_SIZE * 8)];
1293 qd0_rijndael_setup_decrypt(rk, key, DHKEY_SIZE * 8);
1296 qd0_rijndael_decrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), src, xorbuf);
1297 for(i = 0; i < 16; ++i)
1298 dst[i] = xorbuf[i] ^ xorpos[i];
1306 qd0_rijndael_decrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), src, xorbuf);
1307 for(i = 0; i < len; ++i)
1308 dst[i] = xorbuf[i] ^ xorpos[i];
1312 // NOTE: we MUST avoid the following begins of the packet:
1313 // 1. 0xFF, 0xFF, 0xFF, 0xFF
1314 // 2. 0x80, 0x00, length/256, length%256
1315 // this luckily does NOT affect AES mode, where the first byte always is in the range from 0x00 to 0x0F
1316 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)
1318 unsigned char h[32];
1320 if(crypto->authenticated)
1324 // AES packet = 1 byte length overhead, 15 bytes from HMAC-SHA-256, data, 0..15 bytes padding
1325 // 15 bytes HMAC-SHA-256 (112bit) suffice as the attacker can't do more than forge a random-looking packet
1326 // HMAC is needed to not leak information about packet content
1327 if(developer_networking.integer)
1329 Con_Print("To be encrypted:\n");
1330 Com_HexDumpToConsole((const unsigned char *) data_src, len_src);
1332 if(len_src + 32 > len || !HMAC_SHA256_32BYTES(h, (const unsigned char *) data_src, len_src, crypto->dhkey, DHKEY_SIZE))
1334 Con_Printf("Crypto_EncryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1337 *len_dst = ((len_src + 15) / 16) * 16 + 16; // add 16 for HMAC, then round to 16-size for AES
1338 ((unsigned char *) data_dst)[0] = *len_dst - len_src;
1339 memcpy(((unsigned char *) data_dst)+1, h, 15);
1340 aescpy(crypto->dhkey, (const unsigned char *) data_dst, ((unsigned char *) data_dst) + 16, (const unsigned char *) data_src, len_src);
1345 // HMAC packet = 16 bytes HMAC-SHA-256 (truncated to 128 bits), data
1346 if(len_src + 16 > len || !HMAC_SHA256_32BYTES(h, (const unsigned char *) data_src, len_src, crypto->dhkey, DHKEY_SIZE))
1348 Con_Printf("Crypto_EncryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1351 *len_dst = len_src + 16;
1352 memcpy(data_dst, h, 16);
1353 memcpy(((unsigned char *) data_dst) + 16, (unsigned char *) data_src, len_src);
1355 // handle the "avoid" conditions:
1356 i = BuffBigLong((unsigned char *) data_dst);
1358 (i == (int)0xFFFFFFFF) // avoid QW control packet
1360 (i == (int)0x80000000 + (int)*len_dst) // avoid NQ control packet
1362 *(unsigned char *)data_dst ^= 0x80; // this will ALWAYS fix it
1373 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)
1375 unsigned char h[32];
1378 // silently handle non-crypto packets
1379 i = BuffBigLong((unsigned char *) data_src);
1381 (i == (int)0xFFFFFFFF) // avoid QW control packet
1383 (i == (int)0x80000000 + (int)len_src) // avoid NQ control packet
1387 if(crypto->authenticated)
1391 if(len_src < 16 || ((len_src - 16) % 16))
1393 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1396 *len_dst = len_src - ((unsigned char *) data_src)[0];
1397 if(len < *len_dst || *len_dst > len_src - 16)
1399 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d->%d bytes out)\n", (int) len_src, (int) *len_dst, (int) len);
1402 seacpy(crypto->dhkey, (unsigned char *) data_src, (unsigned char *) data_dst, ((const unsigned char *) data_src) + 16, *len_dst);
1404 if(!HMAC_SHA256_32BYTES(h, (const unsigned char *) data_dst, *len_dst, crypto->dhkey, DHKEY_SIZE))
1406 Con_Printf("HMAC fail\n");
1409 if(memcmp(((const unsigned char *) data_src)+1, h, 15)) // ignore first byte, used for length
1411 Con_Printf("HMAC mismatch\n");
1414 if(developer_networking.integer)
1416 Con_Print("Decrypted:\n");
1417 Com_HexDumpToConsole((const unsigned char *) data_dst, *len_dst);
1419 return data_dst; // no need to copy
1425 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1428 *len_dst = len_src - 16;
1431 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d->%d bytes out)\n", (int) len_src, (int) *len_dst, (int) len);
1434 //memcpy(data_dst, data_src + 16, *len_dst);
1435 if(!HMAC_SHA256_32BYTES(h, ((const unsigned char *) data_src) + 16, *len_dst, crypto->dhkey, DHKEY_SIZE))
1437 Con_Printf("HMAC fail\n");
1438 Com_HexDumpToConsole((const unsigned char *) data_src, len_src);
1442 if(memcmp((const unsigned char *) data_src, h, 16)) // ignore first byte, used for length
1444 // undo the "avoid conditions"
1446 (i == (int)0x7FFFFFFF) // avoided QW control packet
1448 (i == (int)0x00000000 + (int)len_src) // avoided NQ control packet
1451 // do the avoidance on the hash too
1453 if(memcmp((const unsigned char *) data_src, h, 16)) // ignore first byte, used for length
1455 Con_Printf("HMAC mismatch\n");
1456 Com_HexDumpToConsole((const unsigned char *) data_src, len_src);
1462 Con_Printf("HMAC mismatch\n");
1463 Com_HexDumpToConsole((const unsigned char *) data_src, len_src);
1467 return ((const unsigned char *) data_src) + 16; // no need to copy, so data_dst is not used
1478 const char *Crypto_GetInfoResponseDataString(void)
1480 crypto_idstring_buf[0] = '0' + crypto_aeslevel.integer;
1481 return crypto_idstring;
1485 qboolean Crypto_ServerAppendToChallenge(const char *data_in, size_t len_in, char *data_out, size_t *len_out, size_t maxlen_out)
1487 // cheap op, all is precomputed
1488 if(!d0_blind_id_dll)
1489 return false; // no support
1491 if(maxlen_out <= *len_out + challenge_append_length)
1493 memcpy(data_out + *len_out, challenge_append, challenge_append_length);
1494 *len_out += challenge_append_length;
1498 static int Crypto_ServerError(char *data_out, size_t *len_out, const char *msg, const char *msg_client)
1502 Con_DPrintf("rejecting client: %s\n", msg);
1504 dpsnprintf(data_out, *len_out, "reject %s", msg_client);
1505 *len_out = strlen(data_out);
1506 return CRYPTO_DISCARD;
1509 static int Crypto_SoftServerError(char *data_out, size_t *len_out, const char *msg)
1512 Con_DPrintf("%s\n", msg);
1513 return CRYPTO_DISCARD;
1516 static int Crypto_ServerParsePacket_Internal(const char *data_in, size_t len_in, char *data_out, size_t *len_out, lhnetaddress_t *peeraddress)
1518 // if "connect": reject if in the middle of crypto handshake
1519 crypto_t *crypto = NULL;
1520 char *data_out_p = data_out;
1521 const char *string = data_in;
1526 if(!d0_blind_id_dll)
1527 return CRYPTO_NOMATCH; // no support
1529 if (len_in > 8 && !memcmp(string, "connect\\", 8) && d0_rijndael_dll && crypto_aeslevel.integer >= 3)
1533 // sorry, we have to verify the challenge here to not reflect network spam
1535 if (!(s = SearchInfostring(string + 4, "challenge")))
1536 return CRYPTO_NOMATCH; // will be later accepted if encryption was set up
1537 // validate the challenge
1538 for (i = 0;i < MAX_CHALLENGES;i++)
1539 if(challenge[i].time > 0)
1540 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1542 // if the challenge is not recognized, drop the packet
1543 if (i == MAX_CHALLENGES) // challenge mismatch is silent
1544 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1546 crypto = Crypto_ServerFindInstance(peeraddress, false);
1547 if(!crypto || !crypto->authenticated)
1548 return Crypto_ServerError(data_out, len_out, "This server requires authentication and encryption to be supported by your client", NULL);
1550 else if(len_in > 5 && !memcmp(string, "d0pk\\", 5) && ((LHNETADDRESS_GetAddressType(peeraddress) == LHNETADDRESSTYPE_LOOP) || sv_public.integer > -3))
1552 const char *cnt, *s, *p;
1554 int clientid = -1, serverid = -1;
1555 cnt = SearchInfostring(string + 4, "id");
1556 id = (cnt ? atoi(cnt) : -1);
1557 cnt = SearchInfostring(string + 4, "cnt");
1559 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1560 GetUntilNul(&data_in, &len_in);
1562 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1563 if(!strcmp(cnt, "0"))
1566 if (!(s = SearchInfostring(string + 4, "challenge")))
1567 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1568 // validate the challenge
1569 for (i = 0;i < MAX_CHALLENGES;i++)
1570 if(challenge[i].time > 0)
1571 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1573 // if the challenge is not recognized, drop the packet
1574 if (i == MAX_CHALLENGES) // challenge mismatch is silent
1575 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1577 if (!(s = SearchInfostring(string + 4, "aeslevel")))
1578 aeslevel = 0; // not supported
1580 aeslevel = bound(0, atoi(s), 3);
1581 switch(bound(0, d0_rijndael_dll ? crypto_aeslevel.integer : 0, 3))
1583 default: // dummy, never happens, but to make gcc happy...
1586 return Crypto_ServerError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)", NULL);
1590 aes = (aeslevel >= 2);
1593 aes = (aeslevel >= 1);
1597 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);
1602 p = GetUntilNul(&data_in, &len_in);
1605 for(i = 0; i < MAX_PUBKEYS; ++i)
1608 if(!strcmp(p, pubkeys_fp64[i]))
1609 if(pubkeys_havepriv[i])
1614 return Crypto_ServerError(data_out, len_out, "Invalid server key", NULL);
1616 p = GetUntilNul(&data_in, &len_in);
1619 for(i = 0; i < MAX_PUBKEYS; ++i)
1622 if(!strcmp(p, pubkeys_fp64[i]))
1627 return Crypto_ServerError(data_out, len_out, "Invalid client key", NULL);
1630 crypto = Crypto_ServerFindInstance(peeraddress, true);
1632 return Crypto_ServerError(data_out, len_out, "Could not create a crypto connect instance", NULL);
1634 CDATA->cdata_id = id;
1635 CDATA->s = serverid;
1636 CDATA->c = clientid;
1637 memset(crypto->dhkey, 0, sizeof(crypto->dhkey));
1638 CDATA->challenge[0] = 0;
1639 crypto->client_keyfp[0] = 0;
1640 crypto->client_idfp[0] = 0;
1641 crypto->server_keyfp[0] = 0;
1642 crypto->server_idfp[0] = 0;
1643 crypto->use_aes = aes != 0;
1647 // I am the server, and my key is ok... so let's set server_keyfp and server_idfp
1648 strlcpy(crypto->server_keyfp, pubkeys_fp64[CDATA->s], sizeof(crypto->server_keyfp));
1649 strlcpy(crypto->server_idfp, pubkeys_priv_fp64[CDATA->s], sizeof(crypto->server_idfp));
1652 CDATA->id = qd0_blind_id_new();
1656 return Crypto_ServerError(data_out, len_out, "d0_blind_id_new failed", "Internal error");
1658 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->s]))
1661 return Crypto_ServerError(data_out, len_out, "d0_blind_id_copy failed", "Internal error");
1663 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\1\\id\\%d\\aes\\%d", CDATA->cdata_id, crypto->use_aes));
1664 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
1667 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_start failed", "Internal error");
1669 CDATA->next_step = 2;
1670 data_out_p += *len_out;
1671 *len_out = data_out_p - data_out;
1672 return CRYPTO_DISCARD;
1674 else if(CDATA->c >= 0)
1677 CDATA->id = qd0_blind_id_new();
1681 return Crypto_ServerError(data_out, len_out, "d0_blind_id_new 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 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\5\\id\\%d\\aes\\%d", CDATA->cdata_id, crypto->use_aes));
1689 if(!qd0_blind_id_authenticate_with_private_id_challenge(CDATA->id, true, false, data_in, len_in, data_out_p, len_out, &status))
1692 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_challenge failed", "Internal error");
1694 CDATA->next_step = 6;
1695 data_out_p += *len_out;
1696 *len_out = data_out_p - data_out;
1697 return CRYPTO_DISCARD;
1702 return Crypto_ServerError(data_out, len_out, "Missing client and server key", NULL);
1705 else if(!strcmp(cnt, "2"))
1708 crypto = Crypto_ServerFindInstance(peeraddress, false);
1710 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1712 if(CDATA->cdata_id != id)
1713 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
1714 if(CDATA->next_step != 2)
1715 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
1717 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\3\\id\\%d", CDATA->cdata_id));
1718 if(!qd0_blind_id_authenticate_with_private_id_response(CDATA->id, data_in, len_in, data_out_p, len_out))
1721 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_response failed", "Internal error");
1723 fpbuflen = DHKEY_SIZE;
1724 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) crypto->dhkey, &fpbuflen))
1727 return Crypto_ServerError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed", "Internal error");
1731 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
1734 return Crypto_ServerError(data_out, len_out, "d0_blind_id_copy failed", "Internal error");
1736 CDATA->next_step = 4;
1740 // session key is FINISHED (no server part is to be expected)! By this, all keys are set up
1741 crypto->authenticated = true;
1742 CDATA->next_step = 0;
1744 data_out_p += *len_out;
1745 *len_out = data_out_p - data_out;
1746 return CRYPTO_DISCARD;
1748 else if(!strcmp(cnt, "4"))
1750 crypto = Crypto_ServerFindInstance(peeraddress, false);
1752 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1754 if(CDATA->cdata_id != id)
1755 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
1756 if(CDATA->next_step != 4)
1757 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
1758 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\5\\id\\%d", CDATA->cdata_id));
1759 if(!qd0_blind_id_authenticate_with_private_id_challenge(CDATA->id, true, false, data_in, len_in, data_out_p, len_out, &status))
1762 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_challenge failed", "Internal error");
1764 CDATA->next_step = 6;
1765 data_out_p += *len_out;
1766 *len_out = data_out_p - data_out;
1767 return CRYPTO_DISCARD;
1769 else if(!strcmp(cnt, "6"))
1771 static char msgbuf[32];
1772 size_t msgbuflen = sizeof(msgbuf);
1775 unsigned char dhkey[DHKEY_SIZE];
1776 crypto = Crypto_ServerFindInstance(peeraddress, false);
1778 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1780 if(CDATA->cdata_id != id)
1781 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
1782 if(CDATA->next_step != 6)
1783 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
1785 if(!qd0_blind_id_authenticate_with_private_id_verify(CDATA->id, data_in, len_in, msgbuf, &msgbuflen, &status))
1788 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_verify failed (authentication error)", "Authentication error");
1791 strlcpy(crypto->client_keyfp, pubkeys_fp64[CDATA->c], sizeof(crypto->client_keyfp));
1793 crypto->client_keyfp[0] = 0;
1794 memset(crypto->client_idfp, 0, sizeof(crypto->client_idfp));
1795 fpbuflen = FP64_SIZE;
1796 if(!qd0_blind_id_fingerprint64_public_id(CDATA->id, crypto->client_idfp, &fpbuflen))
1799 return Crypto_ServerError(data_out, len_out, "d0_blind_id_fingerprint64_public_id failed", "Internal error");
1801 fpbuflen = DHKEY_SIZE;
1802 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) dhkey, &fpbuflen))
1805 return Crypto_ServerError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed", "Internal error");
1807 // XOR the two DH keys together to make one
1808 for(i = 0; i < DHKEY_SIZE; ++i)
1809 crypto->dhkey[i] ^= dhkey[i];
1811 // session key is FINISHED (no server part is to be expected)! By this, all keys are set up
1812 crypto->authenticated = true;
1813 CDATA->next_step = 0;
1814 // send a challenge-less challenge
1815 PutWithNul(&data_out_p, len_out, "challenge ");
1816 *len_out = data_out_p - data_out;
1817 --*len_out; // remove NUL terminator
1818 return CRYPTO_MATCH;
1820 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1822 return CRYPTO_NOMATCH;
1825 int Crypto_ServerParsePacket(const char *data_in, size_t len_in, char *data_out, size_t *len_out, lhnetaddress_t *peeraddress)
1829 static double complain_time = 0;
1831 qboolean do_time = false;
1832 qboolean do_reject = false;
1833 if(crypto_servercpupercent.value > 0 || crypto_servercpumaxtime.value > 0)
1834 if(len_in > 5 && !memcmp(data_in, "d0pk\\", 5))
1837 cnt = SearchInfostring(data_in + 4, "cnt");
1839 if(!strcmp(cnt, "0"))
1844 // check if we may perform crypto...
1845 if(crypto_servercpupercent.value > 0)
1847 crypto_servercpu_accumulator += (realtime - crypto_servercpu_lastrealtime) * crypto_servercpupercent.value * 0.01;
1848 if(crypto_servercpumaxtime.value)
1849 if(crypto_servercpu_accumulator > crypto_servercpumaxtime.value)
1850 crypto_servercpu_accumulator = crypto_servercpumaxtime.value;
1854 if(crypto_servercpumaxtime.value > 0)
1855 if(realtime != crypto_servercpu_lastrealtime)
1856 crypto_servercpu_accumulator = crypto_servercpumaxtime.value;
1858 crypto_servercpu_lastrealtime = realtime;
1859 if(do_reject && crypto_servercpu_accumulator < 0)
1861 if(realtime > complain_time + 5)
1862 Con_Printf("crypto: cannot perform requested crypto operations; denial service attack or crypto_servercpupercent/crypto_servercpumaxtime are too low\n");
1864 return CRYPTO_DISCARD;
1866 t = Sys_DoubleTime();
1868 ret = Crypto_ServerParsePacket_Internal(data_in, len_in, data_out, len_out, peeraddress);
1871 t = Sys_DoubleTime() - t;
1872 if(crypto_servercpudebug.integer)
1873 Con_Printf("crypto: accumulator was %.1f ms, used %.1f ms for crypto, ", crypto_servercpu_accumulator * 1000, t * 1000);
1874 crypto_servercpu_accumulator -= t;
1875 if(crypto_servercpudebug.integer)
1876 Con_Printf("is %.1f ms\n", crypto_servercpu_accumulator * 1000);
1881 static int Crypto_ClientError(char *data_out, size_t *len_out, const char *msg)
1883 dpsnprintf(data_out, *len_out, "reject %s", msg);
1884 *len_out = strlen(data_out);
1885 return CRYPTO_REPLACE;
1888 static int Crypto_SoftClientError(char *data_out, size_t *len_out, const char *msg)
1891 Con_Printf("%s\n", msg);
1892 return CRYPTO_DISCARD;
1895 int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out, size_t *len_out, lhnetaddress_t *peeraddress)
1897 crypto_t *crypto = &cls.crypto;
1898 const char *string = data_in;
1901 char *data_out_p = data_out;
1904 if(!d0_blind_id_dll)
1905 return CRYPTO_NOMATCH; // no support
1907 // if "challenge": verify challenge, and discard message, send next crypto protocol message instead
1908 // otherwise, just handle actual protocol messages
1910 if (len_in == 6 && !memcmp(string, "accept", 6) && cls.connect_trying && d0_rijndael_dll)
1912 int wantserverid = -1;
1913 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL);
1914 if(!crypto || !crypto->authenticated)
1916 if(wantserverid >= 0)
1917 return Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present");
1918 if(crypto_aeslevel.integer >= 3)
1919 return Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)");
1921 return CRYPTO_NOMATCH;
1923 else if (len_in >= 1 && string[0] == 'j' && cls.connect_trying && d0_rijndael_dll && crypto_aeslevel.integer >= 3)
1925 int wantserverid = -1;
1926 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL);
1927 if(!crypto || !crypto->authenticated)
1929 if(wantserverid >= 0)
1930 return Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present");
1931 if(crypto_aeslevel.integer >= 3)
1932 return Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)");
1934 return CRYPTO_NOMATCH;
1936 else if (len_in >= 13 && !memcmp(string, "infoResponse\x0A", 13))
1938 s = SearchInfostring(string + 13, "d0_blind_id");
1940 Crypto_StoreHostKey(peeraddress, s, true);
1941 return CRYPTO_NOMATCH;
1943 else if (len_in >= 15 && !memcmp(string, "statusResponse\x0A", 15))
1947 p = strchr(string + 15, '\n');
1951 * (char *) p = 0; // cut off the string there
1953 s = SearchInfostring(string + 15, "d0_blind_id");
1955 Crypto_StoreHostKey(peeraddress, s, true);
1958 * (char *) p = save;
1959 // invoking those nasal demons again (do not run this on the DS9k)
1961 return CRYPTO_NOMATCH;
1963 else if(len_in > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
1965 const char *vlen_blind_id_ptr = NULL;
1966 size_t len_blind_id_ptr = 0;
1968 const char *challenge = data_in + 10;
1971 int clientid = -1, serverid = -1, wantserverid = -1;
1972 qboolean server_can_auth = true;
1973 char wantserver_idfp[FP64_SIZE+1];
1974 int wantserver_aeslevel;
1976 // if we have a stored host key for the server, assume serverid to already be selected!
1977 // (the loop will refuse to overwrite this one then)
1978 wantserver_idfp[0] = 0;
1979 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, wantserver_idfp, sizeof(wantserver_idfp), &wantserver_aeslevel);
1980 // requirement: wantserver_idfp is a full ID if wantserverid set
1982 // if we leave, we have to consider the connection
1983 // unauthenticated; NOTE: this may be faked by a clever
1984 // attacker to force an unauthenticated connection; so we have
1985 // a safeguard check in place when encryption is required too
1986 // in place, or when authentication is required by the server
1987 crypto->authenticated = false;
1989 GetUntilNul(&data_in, &len_in);
1991 return (wantserverid >= 0) ? Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present") :
1992 (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) :
1995 // FTEQW extension protocol
1998 k = Crypto_LittleLong(data_in);
1999 v = Crypto_LittleLong(data_in + 4);
2007 k = Crypto_LittleLong(data_in);
2012 case PROTOCOL_D0_BLIND_ID:
2013 vlen_blind_id_ptr = data_in;
2014 len_blind_id_ptr = v;
2026 if(!vlen_blind_id_ptr)
2027 return (wantserverid >= 0) ? Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though authentication is required") :
2028 (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) :
2031 data_in = vlen_blind_id_ptr;
2032 len_in = len_blind_id_ptr;
2034 // parse fingerprints
2035 // once we found a fingerprint we can auth to (ANY), select it as clientfp
2036 // once we found a fingerprint in the first list that we know, select it as serverfp
2040 p = GetUntilNul(&data_in, &len_in);
2045 if(!server_can_auth)
2046 break; // other protocol message may follow
2047 server_can_auth = false;
2052 for(i = 0; i < MAX_PUBKEYS; ++i)
2055 if(!strcmp(p, pubkeys_fp64[i]))
2057 if(pubkeys_havepriv[i])
2062 if(wantserverid < 0 || i == wantserverid)
2066 if(clientid >= 0 && serverid >= 0)
2070 // if stored host key is not found:
2071 if(wantserverid >= 0 && serverid < 0)
2072 return Crypto_ClientError(data_out, len_out, "Server CA does not match stored host key, refusing to connect");
2074 if(serverid >= 0 || clientid >= 0)
2076 // TODO at this point, fill clientside crypto struct!
2078 CDATA->cdata_id = ++cdata_id;
2079 CDATA->s = serverid;
2080 CDATA->c = clientid;
2081 memset(crypto->dhkey, 0, sizeof(crypto->dhkey));
2082 strlcpy(CDATA->challenge, challenge, sizeof(CDATA->challenge));
2083 crypto->client_keyfp[0] = 0;
2084 crypto->client_idfp[0] = 0;
2085 crypto->server_keyfp[0] = 0;
2086 crypto->server_idfp[0] = 0;
2087 memcpy(CDATA->wantserver_idfp, wantserver_idfp, sizeof(crypto->server_idfp));
2089 if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2090 switch(bound(0, d0_rijndael_dll ? crypto_aeslevel.integer : 0, 3))
2092 default: // dummy, never happens, but to make gcc happy...
2094 if(wantserver_aeslevel >= 3)
2095 return Crypto_ServerError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)", NULL);
2096 CDATA->wantserver_aes = false;
2099 CDATA->wantserver_aes = (wantserver_aeslevel >= 2);
2102 CDATA->wantserver_aes = (wantserver_aeslevel >= 1);
2105 if(wantserver_aeslevel <= 0)
2106 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);
2107 CDATA->wantserver_aes = true;
2111 // build outgoing message
2112 // append regular stuff
2113 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));
2114 PutWithNul(&data_out_p, len_out, serverid >= 0 ? pubkeys_fp64[serverid] : "");
2115 PutWithNul(&data_out_p, len_out, clientid >= 0 ? pubkeys_fp64[clientid] : "");
2119 // I am the client, and my key is ok... so let's set client_keyfp and client_idfp
2120 strlcpy(crypto->client_keyfp, pubkeys_fp64[CDATA->c], sizeof(crypto->client_keyfp));
2121 strlcpy(crypto->client_idfp, pubkeys_priv_fp64[CDATA->c], sizeof(crypto->client_idfp));
2127 CDATA->id = qd0_blind_id_new();
2131 return Crypto_ClientError(data_out, len_out, "d0_blind_id_new failed");
2133 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->s]))
2136 return Crypto_ClientError(data_out, len_out, "d0_blind_id_copy failed");
2138 CDATA->next_step = 1;
2139 *len_out = data_out_p - data_out;
2141 else if(clientid >= 0)
2143 // skip over server auth, perform client auth only
2145 CDATA->id = qd0_blind_id_new();
2149 return Crypto_ClientError(data_out, len_out, "d0_blind_id_new failed");
2151 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
2154 return Crypto_ClientError(data_out, len_out, "d0_blind_id_copy failed");
2156 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
2159 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_start failed");
2161 CDATA->next_step = 5;
2162 data_out_p += *len_out;
2163 *len_out = data_out_p - data_out;
2166 *len_out = data_out_p - data_out;
2168 return CRYPTO_DISCARD;
2172 if(wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2173 if(wantserver_aeslevel >= 3)
2174 return Crypto_ClientError(data_out, len_out, "Server insists on encryption, but neither can authenticate to the other");
2175 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) :
2179 else if(len_in > 5 && !memcmp(string, "d0pk\\", 5) && cls.connect_trying)
2183 cnt = SearchInfostring(string + 4, "id");
2184 id = (cnt ? atoi(cnt) : -1);
2185 cnt = SearchInfostring(string + 4, "cnt");
2187 return Crypto_ClientError(data_out, len_out, "d0pk\\ message without cnt");
2188 GetUntilNul(&data_in, &len_in);
2190 return Crypto_ClientError(data_out, len_out, "d0pk\\ message without attachment");
2192 if(!strcmp(cnt, "1"))
2195 if(CDATA->cdata_id != id)
2196 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
2197 if(CDATA->next_step != 1)
2198 return Crypto_SoftClientError(data_out, len_out, va("Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
2200 cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
2202 if((s = SearchInfostring(string + 4, "aes")))
2206 // we CANNOT toggle the AES status any more!
2207 // as the server already decided
2208 if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2209 if(!aes && CDATA->wantserver_aes)
2212 return Crypto_ClientError(data_out, len_out, "Stored host key requires encryption, but server did not enable encryption");
2214 if(aes && (!d0_rijndael_dll || crypto_aeslevel.integer <= 0))
2217 return Crypto_ClientError(data_out, len_out, "Server insists on encryption too hard");
2219 if(!aes && (d0_rijndael_dll && crypto_aeslevel.integer >= 3))
2222 return Crypto_ClientError(data_out, len_out, "Server insists on plaintext too hard");
2224 crypto->use_aes = aes != 0;
2226 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\2\\id\\%d", CDATA->cdata_id));
2227 if(!qd0_blind_id_authenticate_with_private_id_challenge(CDATA->id, true, false, data_in, len_in, data_out_p, len_out, &status))
2230 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_challenge failed");
2232 CDATA->next_step = 3;
2233 data_out_p += *len_out;
2234 *len_out = data_out_p - data_out;
2235 return CRYPTO_DISCARD;
2237 else if(!strcmp(cnt, "3"))
2239 static char msgbuf[32];
2240 size_t msgbuflen = sizeof(msgbuf);
2244 if(CDATA->cdata_id != id)
2245 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
2246 if(CDATA->next_step != 3)
2247 return Crypto_SoftClientError(data_out, len_out, va("Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
2249 cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
2251 if(!qd0_blind_id_authenticate_with_private_id_verify(CDATA->id, data_in, len_in, msgbuf, &msgbuflen, &status))
2254 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_verify failed (server authentication error)");
2257 strlcpy(crypto->server_keyfp, pubkeys_fp64[CDATA->s], sizeof(crypto->server_keyfp));
2259 crypto->server_keyfp[0] = 0;
2260 memset(crypto->server_idfp, 0, sizeof(crypto->server_idfp));
2261 fpbuflen = FP64_SIZE;
2262 if(!qd0_blind_id_fingerprint64_public_id(CDATA->id, crypto->server_idfp, &fpbuflen))
2265 return Crypto_ClientError(data_out, len_out, "d0_blind_id_fingerprint64_public_id failed");
2267 if(CDATA->wantserver_idfp[0])
2268 if(memcmp(CDATA->wantserver_idfp, crypto->server_idfp, sizeof(crypto->server_idfp)))
2271 return Crypto_ClientError(data_out, len_out, "Server ID does not match stored host key, refusing to connect");
2273 fpbuflen = DHKEY_SIZE;
2274 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) crypto->dhkey, &fpbuflen))
2277 return Crypto_ClientError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed");
2280 // cache the server key
2281 Crypto_StoreHostKey(&cls.connect_address, va("%d %s@%s", crypto->use_aes ? 1 : 0, crypto->server_idfp, pubkeys_fp64[CDATA->s]), false);
2285 // client will auth next
2286 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\4\\id\\%d", CDATA->cdata_id));
2287 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
2290 return Crypto_ClientError(data_out, len_out, "d0_blind_id_copy failed");
2292 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
2295 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_start failed");
2297 CDATA->next_step = 5;
2298 data_out_p += *len_out;
2299 *len_out = data_out_p - data_out;
2300 return CRYPTO_DISCARD;
2304 // session key is FINISHED (no server part is to be expected)! By this, all keys are set up
2305 crypto->authenticated = true;
2306 CDATA->next_step = 0;
2307 // assume we got the empty challenge to finish the protocol
2308 PutWithNul(&data_out_p, len_out, "challenge ");
2309 *len_out = data_out_p - data_out;
2310 --*len_out; // remove NUL terminator
2311 return CRYPTO_REPLACE;
2314 else if(!strcmp(cnt, "5"))
2317 unsigned char dhkey[DHKEY_SIZE];
2321 if(CDATA->cdata_id != id)
2322 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
2323 if(CDATA->next_step != 5)
2324 return Crypto_SoftClientError(data_out, len_out, va("Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
2326 cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
2328 if(CDATA->s < 0) // only if server didn't auth
2330 if((s = SearchInfostring(string + 4, "aes")))
2334 if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2335 if(!aes && CDATA->wantserver_aes)
2338 return Crypto_ClientError(data_out, len_out, "Stored host key requires encryption, but server did not enable encryption");
2340 if(aes && (!d0_rijndael_dll || crypto_aeslevel.integer <= 0))
2343 return Crypto_ClientError(data_out, len_out, "Server insists on encryption too hard");
2345 if(!aes && (d0_rijndael_dll && crypto_aeslevel.integer >= 3))
2348 return Crypto_ClientError(data_out, len_out, "Server insists on plaintext too hard");
2350 crypto->use_aes = aes != 0;
2353 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\6\\id\\%d", CDATA->cdata_id));
2354 if(!qd0_blind_id_authenticate_with_private_id_response(CDATA->id, data_in, len_in, data_out_p, len_out))
2357 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_response failed");
2359 fpbuflen = DHKEY_SIZE;
2360 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) dhkey, &fpbuflen))
2363 return Crypto_ClientError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed");
2365 // XOR the two DH keys together to make one
2366 for(i = 0; i < DHKEY_SIZE; ++i)
2367 crypto->dhkey[i] ^= dhkey[i];
2368 // session key is FINISHED! By this, all keys are set up
2369 crypto->authenticated = true;
2370 CDATA->next_step = 0;
2371 data_out_p += *len_out;
2372 *len_out = data_out_p - data_out;
2373 return CRYPTO_DISCARD;
2375 return Crypto_SoftClientError(data_out, len_out, "Got unknown d0_blind_id message from server");
2378 return CRYPTO_NOMATCH;
2381 size_t Crypto_SignData(const void *data, size_t datasize, int keyid, void *signed_data, size_t signed_size)
2383 if(keyid < 0 || keyid >= MAX_PUBKEYS)
2385 if(!pubkeys_havepriv[keyid])
2387 if(qd0_blind_id_sign_with_private_id_sign(pubkeys[keyid], true, false, (const char *)data, datasize, (char *)signed_data, &signed_size))
2392 size_t Crypto_SignDataDetached(const void *data, size_t datasize, int keyid, void *signed_data, size_t signed_size)
2394 if(keyid < 0 || keyid >= MAX_PUBKEYS)
2396 if(!pubkeys_havepriv[keyid])
2398 if(qd0_blind_id_sign_with_private_id_sign_detached(pubkeys[keyid], true, false, (const char *)data, datasize, (char *)signed_data, &signed_size))