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 const char base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
358 static void base64_3to4(const unsigned char *in, unsigned char *out, int bytes)
360 unsigned char i0 = (bytes > 0) ? in[0] : 0;
361 unsigned char i1 = (bytes > 1) ? in[1] : 0;
362 unsigned char i2 = (bytes > 2) ? in[2] : 0;
363 unsigned char o0 = base64[i0 >> 2];
364 unsigned char o1 = base64[((i0 << 4) | (i1 >> 4)) & 077];
365 unsigned char o2 = base64[((i1 << 2) | (i2 >> 6)) & 077];
366 unsigned char o3 = base64[i2 & 077];
367 out[0] = (bytes > 0) ? o0 : '?';
368 out[1] = (bytes > 0) ? o1 : '?';
369 out[2] = (bytes > 1) ? o2 : '=';
370 out[3] = (bytes > 2) ? o3 : '=';
373 size_t base64_encode(unsigned char *buf, size_t buflen, size_t outbuflen)
376 // expand the out-buffer
377 blocks = (buflen + 2) / 3;
378 if(blocks*4 > outbuflen)
380 for(i = blocks; i > 0; )
383 base64_3to4(buf + 3*i, buf + 4*i, buflen - 3*i);
388 static qboolean PutWithNul(char **data, size_t *len, const char *str)
390 // invariant: data points to insertion point
391 size_t l = strlen(str);
394 memcpy(*data, str, l+1);
400 static const char *GetUntilNul(const char **data, size_t *len)
402 // invariant: data points to next character to take
403 const char *data_save = *data;
416 p = (const char *) memchr(*data, 0, *len);
417 if(!p) // no terminating NUL
430 return (const char *) data_save;
437 static d0_blind_id_t *Crypto_ReadPublicKey(char *buf, size_t len)
439 d0_blind_id_t *pk = NULL;
442 if(Crypto_ParsePack(buf, len, FOURCC_D0PK, p, l, 2))
444 pk = qd0_blind_id_new();
446 if(qd0_blind_id_read_public_key(pk, p[0], l[0]))
447 if(qd0_blind_id_read_private_id_modulus(pk, p[1], l[1]))
451 qd0_blind_id_free(pk);
456 static qboolean Crypto_AddPrivateKey(d0_blind_id_t *pk, char *buf, size_t len)
460 if(Crypto_ParsePack(buf, len, FOURCC_D0SI, p, l, 1))
462 if(qd0_blind_id_read_private_id(pk, p[0], l[0]))
468 #define MAX_PUBKEYS 16
469 static d0_blind_id_t *pubkeys[MAX_PUBKEYS];
470 static char pubkeys_fp64[MAX_PUBKEYS][FP64_SIZE+1];
471 static qboolean pubkeys_havepriv[MAX_PUBKEYS];
472 static char pubkeys_priv_fp64[MAX_PUBKEYS][FP64_SIZE+1];
473 static char challenge_append[1400];
474 static size_t challenge_append_length;
476 static int keygen_i = -1;
477 static char keygen_buf[8192];
479 #define MAX_CRYPTOCONNECTS 16
480 #define CRYPTOCONNECT_NONE 0
481 #define CRYPTOCONNECT_PRECONNECT 1
482 #define CRYPTOCONNECT_CONNECT 2
483 #define CRYPTOCONNECT_RECONNECT 3
484 #define CRYPTOCONNECT_DUPLICATE 4
485 typedef struct server_cryptoconnect_s
488 lhnetaddress_t address;
492 server_cryptoconnect_t;
493 static server_cryptoconnect_t cryptoconnects[MAX_CRYPTOCONNECTS];
495 static int cdata_id = 0;
501 char challenge[2048];
502 char wantserver_idfp[FP64_SIZE+1];
503 qboolean wantserver_aes;
508 // crypto specific helpers
509 #define CDATA ((crypto_data_t *) crypto->data)
510 #define MAKE_CDATA if(!crypto->data) crypto->data = Z_Malloc(sizeof(crypto_data_t))
511 #define CLEAR_CDATA if(crypto->data) { if(CDATA->id) qd0_blind_id_free(CDATA->id); Z_Free(crypto->data); } crypto->data = NULL
513 static crypto_t *Crypto_ServerFindInstance(lhnetaddress_t *peeraddress, qboolean allow_create)
519 return NULL; // no support
521 for(i = 0; i < MAX_CRYPTOCONNECTS; ++i)
522 if(LHNETADDRESS_Compare(peeraddress, &cryptoconnects[i].address))
524 if(i < MAX_CRYPTOCONNECTS && (allow_create || cryptoconnects[i].crypto.data))
526 crypto = &cryptoconnects[i].crypto;
527 cryptoconnects[i].lasttime = realtime;
533 for(i = 1; i < MAX_CRYPTOCONNECTS; ++i)
534 if(cryptoconnects[i].lasttime < cryptoconnects[best].lasttime)
536 crypto = &cryptoconnects[best].crypto;
537 cryptoconnects[best].lasttime = realtime;
538 memcpy(&cryptoconnects[best].address, peeraddress, sizeof(cryptoconnects[best].address));
543 qboolean Crypto_ServerFinishInstance(crypto_t *out, crypto_t *crypto)
545 // no check needed here (returned pointers are only used in prefilled fields)
546 if(!crypto || !crypto->authenticated)
548 Con_Printf("Passed an invalid crypto connect instance\n");
549 memset(out, 0, sizeof(*out));
553 memcpy(out, crypto, sizeof(*out));
554 memset(crypto, 0, sizeof(crypto));
558 crypto_t *Crypto_ServerGetInstance(lhnetaddress_t *peeraddress)
560 // no check needed here (returned pointers are only used in prefilled fields)
561 return Crypto_ServerFindInstance(peeraddress, false);
564 typedef struct crypto_storedhostkey_s
566 struct crypto_storedhostkey_s *next;
569 char idfp[FP64_SIZE+1];
572 crypto_storedhostkey_t;
573 static crypto_storedhostkey_t *crypto_storedhostkey_hashtable[CRYPTO_HOSTKEY_HASHSIZE];
575 static void Crypto_InitHostKeys(void)
578 for(i = 0; i < CRYPTO_HOSTKEY_HASHSIZE; ++i)
579 crypto_storedhostkey_hashtable[i] = NULL;
582 static void Crypto_ClearHostKeys(void)
585 crypto_storedhostkey_t *hk, *hkn;
586 for(i = 0; i < CRYPTO_HOSTKEY_HASHSIZE; ++i)
588 for(hk = crypto_storedhostkey_hashtable[i]; hk; hk = hkn)
593 crypto_storedhostkey_hashtable[i] = NULL;
597 static qboolean Crypto_ClearHostKey(lhnetaddress_t *peeraddress)
601 crypto_storedhostkey_t **hkp;
602 qboolean found = false;
604 LHNETADDRESS_ToString(peeraddress, buf, sizeof(buf), 1);
605 hashindex = CRC_Block((const unsigned char *) buf, strlen(buf)) % CRYPTO_HOSTKEY_HASHSIZE;
606 for(hkp = &crypto_storedhostkey_hashtable[hashindex]; *hkp && LHNETADDRESS_Compare(&((*hkp)->addr), peeraddress); hkp = &((*hkp)->next));
610 crypto_storedhostkey_t *hk = *hkp;
619 static void Crypto_StoreHostKey(lhnetaddress_t *peeraddress, const char *keystring, qboolean complain)
623 crypto_storedhostkey_t *hk;
625 char idfp[FP64_SIZE+1];
631 // syntax of keystring:
632 // aeslevel id@key id@key ...
636 aeslevel = bound(0, *keystring - '0', 3);
637 while(*keystring && *keystring != ' ')
641 while(*keystring && keyid < 0)
644 const char *idstart, *idend, *keystart, *keyend;
645 ++keystring; // skip the space
647 while(*keystring && *keystring != ' ' && *keystring != '@')
653 keystart = keystring;
654 while(*keystring && *keystring != ' ')
658 if(idend - idstart == FP64_SIZE && keyend - keystart == FP64_SIZE)
660 for(keyid = 0; keyid < MAX_PUBKEYS; ++keyid)
662 if(!memcmp(pubkeys_fp64[keyid], keystart, FP64_SIZE))
664 memcpy(idfp, idstart, FP64_SIZE);
668 if(keyid >= MAX_PUBKEYS)
676 LHNETADDRESS_ToString(peeraddress, buf, sizeof(buf), 1);
677 hashindex = CRC_Block((const unsigned char *) buf, strlen(buf)) % CRYPTO_HOSTKEY_HASHSIZE;
678 for(hk = crypto_storedhostkey_hashtable[hashindex]; hk && LHNETADDRESS_Compare(&hk->addr, peeraddress); hk = hk->next);
684 if(hk->keyid != keyid || memcmp(hk->idfp, idfp, FP64_SIZE+1))
685 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);
686 if(hk->aeslevel > aeslevel)
687 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);
689 hk->aeslevel = max(aeslevel, hk->aeslevel);
693 // great, we did NOT have it yet
694 hk = (crypto_storedhostkey_t *) Z_Malloc(sizeof(*hk));
695 memcpy(&hk->addr, peeraddress, sizeof(hk->addr));
697 memcpy(hk->idfp, idfp, FP64_SIZE+1);
698 hk->next = crypto_storedhostkey_hashtable[hashindex];
699 hk->aeslevel = aeslevel;
700 crypto_storedhostkey_hashtable[hashindex] = hk;
703 qboolean Crypto_RetrieveHostKey(lhnetaddress_t *peeraddress, int *keyid, char *keyfp, size_t keyfplen, char *idfp, size_t idfplen, int *aeslevel)
707 crypto_storedhostkey_t *hk;
712 LHNETADDRESS_ToString(peeraddress, buf, sizeof(buf), 1);
713 hashindex = CRC_Block((const unsigned char *) buf, strlen(buf)) % CRYPTO_HOSTKEY_HASHSIZE;
714 for(hk = crypto_storedhostkey_hashtable[hashindex]; hk && LHNETADDRESS_Compare(&hk->addr, peeraddress); hk = hk->next);
722 strlcpy(keyfp, pubkeys_fp64[hk->keyid], keyfplen);
724 strlcpy(idfp, hk->idfp, idfplen);
726 *aeslevel = hk->aeslevel;
730 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
732 if(keyid < 0 || keyid >= MAX_PUBKEYS)
741 strlcpy(keyfp, pubkeys_fp64[keyid], keyfplen);
743 if(pubkeys_havepriv[keyid])
744 strlcpy(idfp, pubkeys_priv_fp64[keyid], keyfplen);
749 // init/shutdown code
750 static void Crypto_BuildChallengeAppend(void)
752 char *p, *lengthptr, *startptr;
755 p = challenge_append;
756 n = sizeof(challenge_append);
757 Crypto_UnLittleLong(p, PROTOCOL_VLEN);
761 Crypto_UnLittleLong(p, 0);
764 Crypto_UnLittleLong(p, PROTOCOL_D0_BLIND_ID);
768 for(i = 0; i < MAX_PUBKEYS; ++i)
769 if(pubkeys_havepriv[i])
770 PutWithNul(&p, &n, pubkeys_fp64[i]);
771 PutWithNul(&p, &n, "");
772 for(i = 0; i < MAX_PUBKEYS; ++i)
773 if(!pubkeys_havepriv[i] && pubkeys[i])
774 PutWithNul(&p, &n, pubkeys_fp64[i]);
775 Crypto_UnLittleLong(lengthptr, p - startptr);
776 challenge_append_length = p - challenge_append;
779 static void Crypto_LoadKeys(void)
786 // note: we are just a CLIENT
788 // PUBLIC KEYS to accept (including modulus)
789 // PRIVATE KEY of user
791 crypto_idstring = NULL;
792 dpsnprintf(crypto_idstring_buf, sizeof(crypto_idstring_buf), "%d", d0_rijndael_dll ? crypto_aeslevel.integer : 0);
793 for(i = 0; i < MAX_PUBKEYS; ++i)
795 memset(pubkeys_fp64[i], 0, sizeof(pubkeys_fp64[i]));
796 memset(pubkeys_priv_fp64[i], 0, sizeof(pubkeys_fp64[i]));
797 pubkeys_havepriv[i] = false;
798 len = Crypto_LoadFile(va("key_%d.d0pk", i), buf, sizeof(buf));
799 if((pubkeys[i] = Crypto_ReadPublicKey(buf, len)))
802 if(qd0_blind_id_fingerprint64_public_key(pubkeys[i], pubkeys_fp64[i], &len2)) // keeps final NUL
804 Con_Printf("Loaded public key key_%d.d0pk (fingerprint: %s)\n", i, pubkeys_fp64[i]);
805 len = Crypto_LoadFile(va("key_%d.d0si", i), buf, sizeof(buf));
808 if(Crypto_AddPrivateKey(pubkeys[i], buf, len))
811 if(qd0_blind_id_fingerprint64_public_id(pubkeys[i], pubkeys_priv_fp64[i], &len2)) // keeps final NUL
813 Con_Printf("Loaded private ID key_%d.d0si for key_%d.d0pk (fingerprint: %s)\n", i, i, pubkeys_priv_fp64[i]);
814 pubkeys_havepriv[i] = true;
815 strlcat(crypto_idstring_buf, va(" %s@%s", pubkeys_priv_fp64[i], pubkeys_fp64[i]), sizeof(crypto_idstring_buf));
819 // can't really happen
820 // but nothing leaked here
827 // can't really happen
828 qd0_blind_id_free(pubkeys[i]);
833 crypto_idstring = crypto_idstring_buf;
836 Crypto_BuildChallengeAppend();
838 // find a good prefix length for all the keys we know (yes, algorithm is not perfect yet, may yield too long prefix length)
839 crypto_keyfp_recommended_length = 0;
840 memset(buf+256, 0, MAX_PUBKEYS + MAX_PUBKEYS);
841 while(crypto_keyfp_recommended_length < FP64_SIZE)
844 for(i = 0; i < MAX_PUBKEYS; ++i)
848 ++buf[(unsigned char) pubkeys_fp64[i][crypto_keyfp_recommended_length]];
849 if(pubkeys_havepriv[i])
850 if(!buf[256 + MAX_PUBKEYS + i])
851 ++buf[(unsigned char) pubkeys_priv_fp64[i][crypto_keyfp_recommended_length]];
853 for(i = 0; i < MAX_PUBKEYS; ++i)
857 if(buf[(unsigned char) pubkeys_fp64[i][crypto_keyfp_recommended_length]] < 2)
859 if(pubkeys_havepriv[i])
860 if(!buf[256 + MAX_PUBKEYS + i])
861 if(buf[(unsigned char) pubkeys_priv_fp64[i][crypto_keyfp_recommended_length]] < 2)
862 buf[256 + MAX_PUBKEYS + i] = 1;
864 ++crypto_keyfp_recommended_length;
865 for(i = 0; i < MAX_PUBKEYS; ++i)
870 if(pubkeys_havepriv[i])
871 if(!buf[256 + MAX_PUBKEYS + i])
877 if(crypto_keyfp_recommended_length < 7)
878 crypto_keyfp_recommended_length = 7;
881 static void Crypto_UnloadKeys(void)
885 for(i = 0; i < MAX_PUBKEYS; ++i)
888 qd0_blind_id_free(pubkeys[i]);
890 pubkeys_havepriv[i] = false;
891 memset(pubkeys_fp64[i], 0, sizeof(pubkeys_fp64[i]));
892 memset(pubkeys_priv_fp64[i], 0, sizeof(pubkeys_fp64[i]));
893 challenge_append_length = 0;
895 crypto_idstring = NULL;
898 void Crypto_Shutdown(void)
903 Crypto_Rijndael_CloseLibrary();
908 for(i = 0; i < MAX_CRYPTOCONNECTS; ++i)
910 crypto = &cryptoconnects[i].crypto;
913 memset(cryptoconnects, 0, sizeof(cryptoconnects));
914 crypto = &cls.crypto;
919 qd0_blind_id_SHUTDOWN();
921 Crypto_CloseLibrary();
925 void Crypto_Init(void)
927 if(!Crypto_OpenLibrary())
930 if(!qd0_blind_id_INITIALIZE())
932 Crypto_Rijndael_CloseLibrary();
933 Crypto_CloseLibrary();
934 Con_Printf("libd0_blind_id initialization FAILED, cryptography support has been disabled\n");
938 Crypto_Rijndael_OpenLibrary(); // if this fails, it's uncritical
940 Crypto_InitHostKeys();
946 static void Crypto_KeyGen_Finished(int code, size_t length_received, unsigned char *buffer, void *cbdata)
950 static char buf[8192];
951 static char buf2[8192];
952 size_t bufsize, buf2size;
954 d0_blind_id_t *ctx, *ctx2;
960 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
965 if(keygen_i >= MAX_PUBKEYS || !pubkeys[keygen_i])
967 Con_Printf("overflow of keygen_i\n");
973 Con_Printf("Unexpected response from keygen server:\n");
974 Com_HexDumpToConsole(buffer, length_received);
977 if(!Crypto_ParsePack((const char *) buffer, length_received, FOURCC_D0IR, p, l, 1))
979 if(length_received >= 5 && Crypto_LittleLong((const char *) buffer) == FOURCC_D0ER)
981 Con_Printf("Error response from keygen server: %.*s\n", (int)(length_received - 5), buffer + 5);
985 Con_Printf("Invalid response from keygen server:\n");
986 Com_HexDumpToConsole(buffer, length_received);
991 if(!qd0_blind_id_finish_private_id_request(pubkeys[keygen_i], p[0], l[0]))
993 Con_Printf("d0_blind_id_finish_private_id_request failed\n");
998 // verify the key we just got (just in case)
999 ctx = qd0_blind_id_new();
1002 Con_Printf("d0_blind_id_new failed\n");
1006 ctx2 = qd0_blind_id_new();
1009 Con_Printf("d0_blind_id_new failed\n");
1010 qd0_blind_id_free(ctx);
1014 if(!qd0_blind_id_copy(ctx, pubkeys[keygen_i]))
1016 Con_Printf("d0_blind_id_copy failed\n");
1017 qd0_blind_id_free(ctx);
1018 qd0_blind_id_free(ctx2);
1022 if(!qd0_blind_id_copy(ctx2, pubkeys[keygen_i]))
1024 Con_Printf("d0_blind_id_copy failed\n");
1025 qd0_blind_id_free(ctx);
1026 qd0_blind_id_free(ctx2);
1030 bufsize = sizeof(buf);
1031 if(!qd0_blind_id_authenticate_with_private_id_start(ctx, 1, 1, "hello world", 11, buf, &bufsize))
1033 Con_Printf("d0_blind_id_authenticate_with_private_id_start failed\n");
1034 qd0_blind_id_free(ctx);
1035 qd0_blind_id_free(ctx2);
1039 buf2size = sizeof(buf2);
1040 if(!qd0_blind_id_authenticate_with_private_id_challenge(ctx2, 1, 1, buf, bufsize, buf2, &buf2size, &status) || !status)
1042 Con_Printf("d0_blind_id_authenticate_with_private_id_challenge failed (server does not have the requested private key)\n");
1043 qd0_blind_id_free(ctx);
1044 qd0_blind_id_free(ctx2);
1048 bufsize = sizeof(buf);
1049 if(!qd0_blind_id_authenticate_with_private_id_response(ctx, buf2, buf2size, buf, &bufsize))
1051 Con_Printf("d0_blind_id_authenticate_with_private_id_response failed\n");
1052 qd0_blind_id_free(ctx);
1053 qd0_blind_id_free(ctx2);
1057 buf2size = sizeof(buf2);
1058 if(!qd0_blind_id_authenticate_with_private_id_verify(ctx2, buf, bufsize, buf2, &buf2size, &status) || !status)
1060 Con_Printf("d0_blind_id_authenticate_with_private_id_verify failed (server does not have the requested private key)\n");
1061 qd0_blind_id_free(ctx);
1062 qd0_blind_id_free(ctx2);
1066 qd0_blind_id_free(ctx);
1067 qd0_blind_id_free(ctx2);
1069 // we have a valid key now!
1070 // make the rest of crypto.c know that
1072 if(qd0_blind_id_fingerprint64_public_id(pubkeys[keygen_i], pubkeys_priv_fp64[keygen_i], &len2)) // keeps final NUL
1074 Con_Printf("Received private ID key_%d.d0pk (fingerprint: %s)\n", keygen_i, pubkeys_priv_fp64[keygen_i]);
1075 pubkeys_havepriv[keygen_i] = true;
1076 strlcat(crypto_idstring_buf, va(" %s@%s", pubkeys_priv_fp64[keygen_i], pubkeys_fp64[keygen_i]), sizeof(crypto_idstring_buf));
1077 crypto_idstring = crypto_idstring_buf;
1078 Crypto_BuildChallengeAppend();
1080 // write the key to disk
1083 if(!qd0_blind_id_write_private_id(pubkeys[keygen_i], buf, &l[0]))
1085 Con_Printf("d0_blind_id_write_private_id failed\n");
1089 if(!(buf2size = Crypto_UnParsePack(buf2, sizeof(buf2), FOURCC_D0SI, p, l, 1)))
1091 Con_Printf("Crypto_UnParsePack failed\n");
1098 FS_CreatePath(va("%skey_%d.d0si", fs_userdir, keygen_i));
1099 f = FS_SysOpen(va("%skey_%d.d0si", fs_userdir, keygen_i), "wb", false);
1103 FS_CreatePath(va("%skey_%d.d0si", fs_basedir, keygen_i));
1104 f = FS_SysOpen(va("%skey_%d.d0si", fs_basedir, keygen_i), "wb", false);
1108 Con_Printf("Cannot open key_%d.d0si\n", keygen_i);
1112 FS_Write(f, buf2, buf2size);
1115 Con_Printf("Saved to key_%d.d0si\n", keygen_i);
1119 static void Crypto_KeyGen_f(void)
1124 static char buf[8192];
1125 static char buf2[8192];
1126 size_t buf2l, buf2pos;
1127 if(!d0_blind_id_dll)
1129 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1134 Con_Printf("usage:\n%s id url\n", Cmd_Argv(0));
1137 i = atoi(Cmd_Argv(1));
1140 Con_Printf("there is no public key %d\n", i);
1143 if(pubkeys_havepriv[i])
1145 Con_Printf("there is already a private key for %d\n", i);
1150 Con_Printf("there is already a keygen run on the way\n");
1154 if(!qd0_blind_id_generate_private_id_start(pubkeys[keygen_i]))
1156 Con_Printf("d0_blind_id_start failed\n");
1162 if(!qd0_blind_id_generate_private_id_request(pubkeys[keygen_i], buf, &l[0]))
1164 Con_Printf("d0_blind_id_generate_private_id_request failed\n");
1168 buf2pos = strlen(Cmd_Argv(2));
1169 memcpy(buf2, Cmd_Argv(2), buf2pos);
1170 if(!(buf2l = Crypto_UnParsePack(buf2 + buf2pos, sizeof(buf2) - buf2pos - 1, FOURCC_D0IQ, p, l, 1)))
1172 Con_Printf("Crypto_UnParsePack failed\n");
1176 if(!(buf2l = base64_encode((unsigned char *) (buf2 + buf2pos), buf2l, sizeof(buf2) - buf2pos - 1)))
1178 Con_Printf("base64_encode failed\n");
1184 if(!Curl_Begin_ToMemory(buf2, 0, (unsigned char *) keygen_buf, sizeof(keygen_buf), Crypto_KeyGen_Finished, NULL))
1186 Con_Printf("curl failed\n");
1190 Con_Printf("key generation in progress\n");
1195 static void Crypto_Reload_f(void)
1197 Crypto_ClearHostKeys();
1198 Crypto_UnloadKeys();
1202 static void Crypto_Keys_f(void)
1205 if(!d0_blind_id_dll)
1207 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1210 for(i = 0; i < MAX_PUBKEYS; ++i)
1214 Con_Printf("%2d: public key key_%d.d0pk (fingerprint: %s)\n", i, i, pubkeys_fp64[i]);
1215 if(pubkeys_havepriv[i])
1216 Con_Printf(" private key key_%d.d0si (fingerprint: %s)\n", i, pubkeys_priv_fp64[i]);
1221 static void Crypto_HostKeys_f(void)
1224 crypto_storedhostkey_t *hk;
1227 if(!d0_blind_id_dll)
1229 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1232 for(i = 0; i < CRYPTO_HOSTKEY_HASHSIZE; ++i)
1234 for(hk = crypto_storedhostkey_hashtable[i]; hk; hk = hk->next)
1236 LHNETADDRESS_ToString(&hk->addr, buf, sizeof(buf), 1);
1237 Con_Printf("%d %s@%.*s %s\n",
1240 crypto_keyfp_recommended_length, pubkeys_fp64[hk->keyid],
1246 static void Crypto_HostKey_Clear_f(void)
1248 lhnetaddress_t addr;
1251 if(!d0_blind_id_dll)
1253 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1257 for(i = 1; i < Cmd_Argc(); ++i)
1259 LHNETADDRESS_FromString(&addr, Cmd_Argv(i), 26000);
1260 if(Crypto_ClearHostKey(&addr))
1262 Con_Printf("cleared host key for %s\n", Cmd_Argv(i));
1267 void Crypto_Init_Commands(void)
1271 Cmd_AddCommand("crypto_reload", Crypto_Reload_f, "reloads cryptographic keys");
1272 Cmd_AddCommand("crypto_keygen", Crypto_KeyGen_f, "generates and saves a cryptographic key");
1273 Cmd_AddCommand("crypto_keys", Crypto_Keys_f, "lists the loaded keys");
1274 Cmd_AddCommand("crypto_hostkeys", Crypto_HostKeys_f, "lists the cached host keys");
1275 Cmd_AddCommand("crypto_hostkey_clear", Crypto_HostKey_Clear_f, "clears a cached host key");
1276 Cvar_RegisterVariable(&crypto_developer);
1278 Cvar_RegisterVariable(&crypto_aeslevel);
1280 crypto_aeslevel.integer = 0; // make sure
1281 Cvar_RegisterVariable(&crypto_servercpupercent);
1282 Cvar_RegisterVariable(&crypto_servercpumaxtime);
1283 Cvar_RegisterVariable(&crypto_servercpudebug);
1289 static void aescpy(unsigned char *key, const unsigned char *iv, unsigned char *dst, const unsigned char *src, size_t len)
1291 const unsigned char *xorpos = iv;
1292 unsigned char xorbuf[16];
1293 unsigned long rk[D0_RIJNDAEL_RKLENGTH(DHKEY_SIZE * 8)];
1295 qd0_rijndael_setup_encrypt(rk, key, DHKEY_SIZE * 8);
1298 for(i = 0; i < 16; ++i)
1299 xorbuf[i] = src[i] ^ xorpos[i];
1300 qd0_rijndael_encrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), xorbuf, dst);
1308 for(i = 0; i < len; ++i)
1309 xorbuf[i] = src[i] ^ xorpos[i];
1311 xorbuf[i] = xorpos[i];
1312 qd0_rijndael_encrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), xorbuf, dst);
1315 static void seacpy(unsigned char *key, const unsigned char *iv, unsigned char *dst, const unsigned char *src, size_t len)
1317 const unsigned char *xorpos = iv;
1318 unsigned char xorbuf[16];
1319 unsigned long rk[D0_RIJNDAEL_RKLENGTH(DHKEY_SIZE * 8)];
1321 qd0_rijndael_setup_decrypt(rk, key, DHKEY_SIZE * 8);
1324 qd0_rijndael_decrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), src, xorbuf);
1325 for(i = 0; i < 16; ++i)
1326 dst[i] = xorbuf[i] ^ xorpos[i];
1334 qd0_rijndael_decrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), src, xorbuf);
1335 for(i = 0; i < len; ++i)
1336 dst[i] = xorbuf[i] ^ xorpos[i];
1340 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)
1342 unsigned char h[32];
1343 if(crypto->authenticated)
1347 // AES packet = 1 byte length overhead, 15 bytes from HMAC-SHA-256, data, 0..15 bytes padding
1348 // 15 bytes HMAC-SHA-256 (112bit) suffice as the attacker can't do more than forge a random-looking packet
1349 // HMAC is needed to not leak information about packet content
1350 if(developer_networking.integer)
1352 Con_Print("To be encrypted:\n");
1353 Com_HexDumpToConsole((const unsigned char *) data_src, len_src);
1355 if(len_src + 32 > len || !HMAC_SHA256_32BYTES(h, (const unsigned char *) data_src, len_src, crypto->dhkey, DHKEY_SIZE))
1357 Con_Printf("Crypto_EncryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1360 *len_dst = ((len_src + 15) / 16) * 16 + 16; // add 16 for HMAC, then round to 16-size for AES
1361 ((unsigned char *) data_dst)[0] = *len_dst - len_src;
1362 memcpy(((unsigned char *) data_dst)+1, h, 15);
1363 aescpy(crypto->dhkey, (const unsigned char *) data_dst, ((unsigned char *) data_dst) + 16, (const unsigned char *) data_src, len_src);
1368 // HMAC packet = 16 bytes HMAC-SHA-256 (truncated to 128 bits), data
1369 if(len_src + 16 > len || !HMAC_SHA256_32BYTES(h, (const unsigned char *) data_src, len_src, crypto->dhkey, DHKEY_SIZE))
1371 Con_Printf("Crypto_EncryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1374 *len_dst = len_src + 16;
1375 memcpy(data_dst, h, 16);
1376 memcpy(((unsigned char *) data_dst) + 16, (unsigned char *) data_src, len_src);
1387 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)
1389 unsigned char h[32];
1390 if(crypto->authenticated)
1394 if(len_src < 16 || ((len_src - 16) % 16))
1396 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1399 *len_dst = len_src - ((unsigned char *) data_src)[0];
1400 if(len < *len_dst || *len_dst > len_src - 16)
1402 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d->%d bytes out)\n", (int) len_src, (int) *len_dst, (int) len);
1405 seacpy(crypto->dhkey, (unsigned char *) data_src, (unsigned char *) data_dst, ((const unsigned char *) data_src) + 16, *len_dst);
1407 if(!HMAC_SHA256_32BYTES(h, (const unsigned char *) data_dst, *len_dst, crypto->dhkey, DHKEY_SIZE))
1409 Con_Printf("HMAC fail\n");
1412 if(memcmp(((const unsigned char *) data_src)+1, h, 15)) // ignore first byte, used for length
1414 Con_Printf("HMAC mismatch\n");
1417 if(developer_networking.integer)
1419 Con_Print("Decrypted:\n");
1420 Com_HexDumpToConsole((const unsigned char *) data_dst, *len_dst);
1422 return data_dst; // no need to copy
1428 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1431 *len_dst = len_src - 16;
1434 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d->%d bytes out)\n", (int) len_src, (int) *len_dst, (int) len);
1437 //memcpy(data_dst, data_src + 16, *len_dst);
1438 if(!HMAC_SHA256_32BYTES(h, ((const unsigned char *) data_src) + 16, *len_dst, crypto->dhkey, DHKEY_SIZE))
1440 Con_Printf("HMAC fail\n");
1441 Com_HexDumpToConsole((const unsigned char *) data_src, len_src);
1444 if(memcmp((const unsigned char *) data_src, h, 16)) // ignore first byte, used for length
1446 Con_Printf("HMAC mismatch\n");
1447 Com_HexDumpToConsole((const unsigned char *) data_src, len_src);
1450 return ((const unsigned char *) data_src) + 16; // no need to copy, so data_dst is not used
1461 const char *Crypto_GetInfoResponseDataString(void)
1463 crypto_idstring_buf[0] = '0' + crypto_aeslevel.integer;
1464 return crypto_idstring;
1468 qboolean Crypto_ServerAppendToChallenge(const char *data_in, size_t len_in, char *data_out, size_t *len_out, size_t maxlen_out)
1470 // cheap op, all is precomputed
1471 if(!d0_blind_id_dll)
1472 return false; // no support
1474 if(maxlen_out <= *len_out + challenge_append_length)
1476 memcpy(data_out + *len_out, challenge_append, challenge_append_length);
1477 *len_out += challenge_append_length;
1481 static int Crypto_ServerError(char *data_out, size_t *len_out, const char *msg, const char *msg_client)
1485 Con_DPrintf("rejecting client: %s\n", msg);
1487 dpsnprintf(data_out, *len_out, "reject %s", msg_client);
1488 *len_out = strlen(data_out);
1489 return CRYPTO_DISCARD;
1492 static int Crypto_SoftServerError(char *data_out, size_t *len_out, const char *msg)
1495 Con_DPrintf("%s\n", msg);
1496 return CRYPTO_DISCARD;
1499 static int Crypto_ServerParsePacket_Internal(const char *data_in, size_t len_in, char *data_out, size_t *len_out, lhnetaddress_t *peeraddress)
1501 // if "connect": reject if in the middle of crypto handshake
1502 crypto_t *crypto = NULL;
1503 char *data_out_p = data_out;
1504 const char *string = data_in;
1509 if(!d0_blind_id_dll)
1510 return CRYPTO_NOMATCH; // no support
1512 if (len_in > 8 && !memcmp(string, "connect\\", 8) && d0_rijndael_dll && crypto_aeslevel.integer >= 3)
1516 // sorry, we have to verify the challenge here to not reflect network spam
1518 if (!(s = SearchInfostring(string + 4, "challenge")))
1519 return CRYPTO_NOMATCH; // will be later accepted if encryption was set up
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 crypto = Crypto_ServerFindInstance(peeraddress, false);
1530 if(!crypto || !crypto->authenticated)
1531 return Crypto_ServerError(data_out, len_out, "This server requires authentication and encryption to be supported by your client", NULL);
1533 else if(len_in > 5 && !memcmp(string, "d0pk\\", 5) && ((LHNETADDRESS_GetAddressType(peeraddress) == LHNETADDRESSTYPE_LOOP) || sv_public.integer > -3))
1535 const char *cnt, *s, *p;
1537 int clientid = -1, serverid = -1;
1538 cnt = SearchInfostring(string + 4, "id");
1539 id = (cnt ? atoi(cnt) : -1);
1540 cnt = SearchInfostring(string + 4, "cnt");
1542 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1543 GetUntilNul(&data_in, &len_in);
1545 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1546 if(!strcmp(cnt, "0"))
1549 if (!(s = SearchInfostring(string + 4, "challenge")))
1550 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1551 // validate the challenge
1552 for (i = 0;i < MAX_CHALLENGES;i++)
1553 if(challenge[i].time > 0)
1554 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1556 // if the challenge is not recognized, drop the packet
1557 if (i == MAX_CHALLENGES) // challenge mismatch is silent
1558 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1560 if (!(s = SearchInfostring(string + 4, "aeslevel")))
1561 aeslevel = 0; // not supported
1563 aeslevel = bound(0, atoi(s), 3);
1564 switch(bound(0, d0_rijndael_dll ? crypto_aeslevel.integer : 0, 3))
1566 default: // dummy, never happens, but to make gcc happy...
1569 return Crypto_ServerError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)", NULL);
1573 aes = (aeslevel >= 2);
1576 aes = (aeslevel >= 1);
1580 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);
1585 p = GetUntilNul(&data_in, &len_in);
1588 for(i = 0; i < MAX_PUBKEYS; ++i)
1591 if(!strcmp(p, pubkeys_fp64[i]))
1592 if(pubkeys_havepriv[i])
1597 return Crypto_ServerError(data_out, len_out, "Invalid server key", NULL);
1599 p = GetUntilNul(&data_in, &len_in);
1602 for(i = 0; i < MAX_PUBKEYS; ++i)
1605 if(!strcmp(p, pubkeys_fp64[i]))
1610 return Crypto_ServerError(data_out, len_out, "Invalid client key", NULL);
1613 crypto = Crypto_ServerFindInstance(peeraddress, true);
1615 return Crypto_ServerError(data_out, len_out, "Could not create a crypto connect instance", NULL);
1617 CDATA->cdata_id = id;
1618 CDATA->s = serverid;
1619 CDATA->c = clientid;
1620 memset(crypto->dhkey, 0, sizeof(crypto->dhkey));
1621 CDATA->challenge[0] = 0;
1622 crypto->client_keyfp[0] = 0;
1623 crypto->client_idfp[0] = 0;
1624 crypto->server_keyfp[0] = 0;
1625 crypto->server_idfp[0] = 0;
1626 crypto->use_aes = aes != 0;
1630 // I am the server, and my key is ok... so let's set server_keyfp and server_idfp
1631 strlcpy(crypto->server_keyfp, pubkeys_fp64[CDATA->s], sizeof(crypto->server_keyfp));
1632 strlcpy(crypto->server_idfp, pubkeys_priv_fp64[CDATA->s], sizeof(crypto->server_idfp));
1635 CDATA->id = qd0_blind_id_new();
1639 return Crypto_ServerError(data_out, len_out, "d0_blind_id_new failed", "Internal error");
1641 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->s]))
1644 return Crypto_ServerError(data_out, len_out, "d0_blind_id_copy failed", "Internal error");
1646 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\1\\id\\%d\\aes\\%d", CDATA->cdata_id, crypto->use_aes));
1647 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
1650 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_start failed", "Internal error");
1652 CDATA->next_step = 2;
1653 data_out_p += *len_out;
1654 *len_out = data_out_p - data_out;
1655 return CRYPTO_DISCARD;
1657 else if(CDATA->c >= 0)
1660 CDATA->id = qd0_blind_id_new();
1664 return Crypto_ServerError(data_out, len_out, "d0_blind_id_new failed", "Internal error");
1666 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
1669 return Crypto_ServerError(data_out, len_out, "d0_blind_id_copy failed", "Internal error");
1671 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\5\\id\\%d\\aes\\%d", CDATA->cdata_id, crypto->use_aes));
1672 if(!qd0_blind_id_authenticate_with_private_id_challenge(CDATA->id, true, false, data_in, len_in, data_out_p, len_out, &status))
1675 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_challenge failed", "Internal error");
1677 CDATA->next_step = 6;
1678 data_out_p += *len_out;
1679 *len_out = data_out_p - data_out;
1680 return CRYPTO_DISCARD;
1685 return Crypto_ServerError(data_out, len_out, "Missing client and server key", NULL);
1688 else if(!strcmp(cnt, "2"))
1691 crypto = Crypto_ServerFindInstance(peeraddress, false);
1693 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1695 if(CDATA->cdata_id != id)
1696 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
1697 if(CDATA->next_step != 2)
1698 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
1700 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\3\\id\\%d", CDATA->cdata_id));
1701 if(!qd0_blind_id_authenticate_with_private_id_response(CDATA->id, data_in, len_in, data_out_p, len_out))
1704 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_response failed", "Internal error");
1706 fpbuflen = DHKEY_SIZE;
1707 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) crypto->dhkey, &fpbuflen))
1710 return Crypto_ServerError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed", "Internal error");
1714 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
1717 return Crypto_ServerError(data_out, len_out, "d0_blind_id_copy failed", "Internal error");
1719 CDATA->next_step = 4;
1723 // session key is FINISHED (no server part is to be expected)! By this, all keys are set up
1724 crypto->authenticated = true;
1725 CDATA->next_step = 0;
1727 data_out_p += *len_out;
1728 *len_out = data_out_p - data_out;
1729 return CRYPTO_DISCARD;
1731 else if(!strcmp(cnt, "4"))
1733 crypto = Crypto_ServerFindInstance(peeraddress, false);
1735 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1737 if(CDATA->cdata_id != id)
1738 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
1739 if(CDATA->next_step != 4)
1740 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
1741 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\5\\id\\%d", CDATA->cdata_id));
1742 if(!qd0_blind_id_authenticate_with_private_id_challenge(CDATA->id, true, false, data_in, len_in, data_out_p, len_out, &status))
1745 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_challenge failed", "Internal error");
1747 CDATA->next_step = 6;
1748 data_out_p += *len_out;
1749 *len_out = data_out_p - data_out;
1750 return CRYPTO_DISCARD;
1752 else if(!strcmp(cnt, "6"))
1754 static char msgbuf[32];
1755 size_t msgbuflen = sizeof(msgbuf);
1758 unsigned char dhkey[DHKEY_SIZE];
1759 crypto = Crypto_ServerFindInstance(peeraddress, false);
1761 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1763 if(CDATA->cdata_id != id)
1764 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
1765 if(CDATA->next_step != 6)
1766 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
1768 if(!qd0_blind_id_authenticate_with_private_id_verify(CDATA->id, data_in, len_in, msgbuf, &msgbuflen, &status))
1771 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_verify failed (authentication error)", "Authentication error");
1774 strlcpy(crypto->client_keyfp, pubkeys_fp64[CDATA->c], sizeof(crypto->client_keyfp));
1776 crypto->client_keyfp[0] = 0;
1777 memset(crypto->client_idfp, 0, sizeof(crypto->client_idfp));
1778 fpbuflen = FP64_SIZE;
1779 if(!qd0_blind_id_fingerprint64_public_id(CDATA->id, crypto->client_idfp, &fpbuflen))
1782 return Crypto_ServerError(data_out, len_out, "d0_blind_id_fingerprint64_public_id failed", "Internal error");
1784 fpbuflen = DHKEY_SIZE;
1785 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) dhkey, &fpbuflen))
1788 return Crypto_ServerError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed", "Internal error");
1790 // XOR the two DH keys together to make one
1791 for(i = 0; i < DHKEY_SIZE; ++i)
1792 crypto->dhkey[i] ^= dhkey[i];
1794 // session key is FINISHED (no server part is to be expected)! By this, all keys are set up
1795 crypto->authenticated = true;
1796 CDATA->next_step = 0;
1797 // send a challenge-less challenge
1798 PutWithNul(&data_out_p, len_out, "challenge ");
1799 *len_out = data_out_p - data_out;
1800 --*len_out; // remove NUL terminator
1801 return CRYPTO_MATCH;
1803 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1805 return CRYPTO_NOMATCH;
1808 int Crypto_ServerParsePacket(const char *data_in, size_t len_in, char *data_out, size_t *len_out, lhnetaddress_t *peeraddress)
1812 static double complain_time = 0;
1814 qboolean do_time = false;
1815 qboolean do_reject = false;
1816 if(crypto_servercpupercent.value > 0 || crypto_servercpumaxtime.value > 0)
1817 if(len_in > 5 && !memcmp(data_in, "d0pk\\", 5))
1820 cnt = SearchInfostring(data_in + 4, "cnt");
1822 if(!strcmp(cnt, "0"))
1827 // check if we may perform crypto...
1828 if(crypto_servercpupercent.value > 0)
1830 crypto_servercpu_accumulator += (realtime - crypto_servercpu_lastrealtime) * crypto_servercpupercent.value * 0.01;
1831 if(crypto_servercpumaxtime.value)
1832 if(crypto_servercpu_accumulator > crypto_servercpumaxtime.value)
1833 crypto_servercpu_accumulator = crypto_servercpumaxtime.value;
1837 if(crypto_servercpumaxtime.value > 0)
1838 if(realtime != crypto_servercpu_lastrealtime)
1839 crypto_servercpu_accumulator = crypto_servercpumaxtime.value;
1841 crypto_servercpu_lastrealtime = realtime;
1842 if(do_reject && crypto_servercpu_accumulator < 0)
1844 if(realtime > complain_time + 5)
1845 Con_Printf("crypto: cannot perform requested crypto operations; denial service attack or crypto_servercpupercent/crypto_servercpumaxtime are too low\n");
1847 return CRYPTO_DISCARD;
1849 t = Sys_DoubleTime();
1851 ret = Crypto_ServerParsePacket_Internal(data_in, len_in, data_out, len_out, peeraddress);
1854 t = Sys_DoubleTime() - t;
1855 if(crypto_servercpudebug.integer)
1856 Con_Printf("crypto: accumulator was %.1f ms, used %.1f ms for crypto, ", crypto_servercpu_accumulator * 1000, t * 1000);
1857 crypto_servercpu_accumulator -= t;
1858 if(crypto_servercpudebug.integer)
1859 Con_Printf("is %.1f ms\n", crypto_servercpu_accumulator * 1000);
1864 static int Crypto_ClientError(char *data_out, size_t *len_out, const char *msg)
1866 dpsnprintf(data_out, *len_out, "reject %s", msg);
1867 *len_out = strlen(data_out);
1868 return CRYPTO_REPLACE;
1871 static int Crypto_SoftClientError(char *data_out, size_t *len_out, const char *msg)
1874 Con_Printf("%s\n", msg);
1875 return CRYPTO_DISCARD;
1878 int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out, size_t *len_out, lhnetaddress_t *peeraddress)
1880 crypto_t *crypto = &cls.crypto;
1881 const char *string = data_in;
1884 char *data_out_p = data_out;
1887 if(!d0_blind_id_dll)
1888 return CRYPTO_NOMATCH; // no support
1890 // if "challenge": verify challenge, and discard message, send next crypto protocol message instead
1891 // otherwise, just handle actual protocol messages
1893 if (len_in == 6 && !memcmp(string, "accept", 6) && cls.connect_trying && d0_rijndael_dll)
1895 int wantserverid = -1;
1896 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL);
1897 if(!crypto || !crypto->authenticated)
1899 if(wantserverid >= 0)
1900 return Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present");
1901 if(crypto_aeslevel.integer >= 3)
1902 return Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)");
1904 return CRYPTO_NOMATCH;
1906 else if (len_in >= 1 && string[0] == 'j' && cls.connect_trying && d0_rijndael_dll && crypto_aeslevel.integer >= 3)
1908 int wantserverid = -1;
1909 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL);
1910 if(!crypto || !crypto->authenticated)
1912 if(wantserverid >= 0)
1913 return Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present");
1914 if(crypto_aeslevel.integer >= 3)
1915 return Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)");
1917 return CRYPTO_NOMATCH;
1919 else if (len_in >= 13 && !memcmp(string, "infoResponse\x0A", 13))
1921 s = SearchInfostring(string + 13, "d0_blind_id");
1923 Crypto_StoreHostKey(peeraddress, s, true);
1924 return CRYPTO_NOMATCH;
1926 else if (len_in >= 15 && !memcmp(string, "statusResponse\x0A", 15))
1930 p = strchr(string + 15, '\n');
1934 * (char *) p = 0; // cut off the string there
1936 s = SearchInfostring(string + 15, "d0_blind_id");
1938 Crypto_StoreHostKey(peeraddress, s, true);
1941 * (char *) p = save;
1942 // invoking those nasal demons again (do not run this on the DS9k)
1944 return CRYPTO_NOMATCH;
1946 else if(len_in > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
1948 const char *vlen_blind_id_ptr = NULL;
1949 size_t len_blind_id_ptr = 0;
1951 const char *challenge = data_in + 10;
1954 int clientid = -1, serverid = -1, wantserverid = -1;
1955 qboolean server_can_auth = true;
1956 char wantserver_idfp[FP64_SIZE+1];
1957 int wantserver_aeslevel;
1959 // if we have a stored host key for the server, assume serverid to already be selected!
1960 // (the loop will refuse to overwrite this one then)
1961 wantserver_idfp[0] = 0;
1962 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, wantserver_idfp, sizeof(wantserver_idfp), &wantserver_aeslevel);
1963 // requirement: wantserver_idfp is a full ID if wantserverid set
1965 // if we leave, we have to consider the connection
1966 // unauthenticated; NOTE: this may be faked by a clever
1967 // attacker to force an unauthenticated connection; so we have
1968 // a safeguard check in place when encryption is required too
1969 // in place, or when authentication is required by the server
1970 crypto->authenticated = false;
1972 GetUntilNul(&data_in, &len_in);
1974 return (wantserverid >= 0) ? Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present") :
1975 (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) :
1978 // FTEQW extension protocol
1981 k = Crypto_LittleLong(data_in);
1982 v = Crypto_LittleLong(data_in + 4);
1990 k = Crypto_LittleLong(data_in);
1995 case PROTOCOL_D0_BLIND_ID:
1996 vlen_blind_id_ptr = data_in;
1997 len_blind_id_ptr = v;
2009 if(!vlen_blind_id_ptr)
2010 return (wantserverid >= 0) ? Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though authentication is required") :
2011 (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) :
2014 data_in = vlen_blind_id_ptr;
2015 len_in = len_blind_id_ptr;
2017 // parse fingerprints
2018 // once we found a fingerprint we can auth to (ANY), select it as clientfp
2019 // once we found a fingerprint in the first list that we know, select it as serverfp
2023 p = GetUntilNul(&data_in, &len_in);
2028 if(!server_can_auth)
2029 break; // other protocol message may follow
2030 server_can_auth = false;
2035 for(i = 0; i < MAX_PUBKEYS; ++i)
2038 if(!strcmp(p, pubkeys_fp64[i]))
2040 if(pubkeys_havepriv[i])
2045 if(wantserverid < 0 || i == wantserverid)
2049 if(clientid >= 0 && serverid >= 0)
2053 // if stored host key is not found:
2054 if(wantserverid >= 0 && serverid < 0)
2055 return Crypto_ClientError(data_out, len_out, "Server CA does not match stored host key, refusing to connect");
2057 if(serverid >= 0 || clientid >= 0)
2059 // TODO at this point, fill clientside crypto struct!
2061 CDATA->cdata_id = ++cdata_id;
2062 CDATA->s = serverid;
2063 CDATA->c = clientid;
2064 memset(crypto->dhkey, 0, sizeof(crypto->dhkey));
2065 strlcpy(CDATA->challenge, challenge, sizeof(CDATA->challenge));
2066 crypto->client_keyfp[0] = 0;
2067 crypto->client_idfp[0] = 0;
2068 crypto->server_keyfp[0] = 0;
2069 crypto->server_idfp[0] = 0;
2070 memcpy(CDATA->wantserver_idfp, wantserver_idfp, sizeof(crypto->server_idfp));
2072 if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2073 switch(bound(0, d0_rijndael_dll ? crypto_aeslevel.integer : 0, 3))
2075 default: // dummy, never happens, but to make gcc happy...
2077 if(wantserver_aeslevel >= 3)
2078 return Crypto_ServerError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)", NULL);
2079 CDATA->wantserver_aes = false;
2082 CDATA->wantserver_aes = (wantserver_aeslevel >= 2);
2085 CDATA->wantserver_aes = (wantserver_aeslevel >= 1);
2088 if(wantserver_aeslevel <= 0)
2089 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);
2090 CDATA->wantserver_aes = true;
2094 // build outgoing message
2095 // append regular stuff
2096 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));
2097 PutWithNul(&data_out_p, len_out, serverid >= 0 ? pubkeys_fp64[serverid] : "");
2098 PutWithNul(&data_out_p, len_out, clientid >= 0 ? pubkeys_fp64[clientid] : "");
2102 // I am the client, and my key is ok... so let's set client_keyfp and client_idfp
2103 strlcpy(crypto->client_keyfp, pubkeys_fp64[CDATA->c], sizeof(crypto->client_keyfp));
2104 strlcpy(crypto->client_idfp, pubkeys_priv_fp64[CDATA->c], sizeof(crypto->client_idfp));
2110 CDATA->id = qd0_blind_id_new();
2114 return Crypto_ClientError(data_out, len_out, "d0_blind_id_new failed");
2116 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->s]))
2119 return Crypto_ClientError(data_out, len_out, "d0_blind_id_copy failed");
2121 CDATA->next_step = 1;
2122 *len_out = data_out_p - data_out;
2124 else if(clientid >= 0)
2126 // skip over server auth, perform client auth only
2128 CDATA->id = qd0_blind_id_new();
2132 return Crypto_ClientError(data_out, len_out, "d0_blind_id_new failed");
2134 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
2137 return Crypto_ClientError(data_out, len_out, "d0_blind_id_copy failed");
2139 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
2142 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_start failed");
2144 CDATA->next_step = 5;
2145 data_out_p += *len_out;
2146 *len_out = data_out_p - data_out;
2149 *len_out = data_out_p - data_out;
2151 return CRYPTO_DISCARD;
2155 if(wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2156 if(wantserver_aeslevel >= 3)
2157 return Crypto_ClientError(data_out, len_out, "Server insists on encryption, but neither can authenticate to the other");
2158 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) :
2162 else if(len_in > 5 && !memcmp(string, "d0pk\\", 5) && cls.connect_trying)
2166 cnt = SearchInfostring(string + 4, "id");
2167 id = (cnt ? atoi(cnt) : -1);
2168 cnt = SearchInfostring(string + 4, "cnt");
2170 return Crypto_ClientError(data_out, len_out, "d0pk\\ message without cnt");
2171 GetUntilNul(&data_in, &len_in);
2173 return Crypto_ClientError(data_out, len_out, "d0pk\\ message without attachment");
2175 if(!strcmp(cnt, "1"))
2178 if(CDATA->cdata_id != id)
2179 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
2180 if(CDATA->next_step != 1)
2181 return Crypto_SoftClientError(data_out, len_out, va("Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
2183 cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
2185 if((s = SearchInfostring(string + 4, "aes")))
2189 // we CANNOT toggle the AES status any more!
2190 // as the server already decided
2191 if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2192 if(!aes && CDATA->wantserver_aes)
2195 return Crypto_ClientError(data_out, len_out, "Stored host key requires encryption, but server did not enable encryption");
2197 if(aes && (!d0_rijndael_dll || crypto_aeslevel.integer <= 0))
2200 return Crypto_ClientError(data_out, len_out, "Server insists on encryption too hard");
2202 if(!aes && (d0_rijndael_dll && crypto_aeslevel.integer >= 3))
2205 return Crypto_ClientError(data_out, len_out, "Server insists on plaintext too hard");
2207 crypto->use_aes = aes != 0;
2209 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\2\\id\\%d", CDATA->cdata_id));
2210 if(!qd0_blind_id_authenticate_with_private_id_challenge(CDATA->id, true, false, data_in, len_in, data_out_p, len_out, &status))
2213 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_challenge failed");
2215 CDATA->next_step = 3;
2216 data_out_p += *len_out;
2217 *len_out = data_out_p - data_out;
2218 return CRYPTO_DISCARD;
2220 else if(!strcmp(cnt, "3"))
2222 static char msgbuf[32];
2223 size_t msgbuflen = sizeof(msgbuf);
2227 if(CDATA->cdata_id != id)
2228 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
2229 if(CDATA->next_step != 3)
2230 return Crypto_SoftClientError(data_out, len_out, va("Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
2232 cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
2234 if(!qd0_blind_id_authenticate_with_private_id_verify(CDATA->id, data_in, len_in, msgbuf, &msgbuflen, &status))
2237 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_verify failed (server authentication error)");
2240 strlcpy(crypto->server_keyfp, pubkeys_fp64[CDATA->s], sizeof(crypto->server_keyfp));
2242 crypto->server_keyfp[0] = 0;
2243 memset(crypto->server_idfp, 0, sizeof(crypto->server_idfp));
2244 fpbuflen = FP64_SIZE;
2245 if(!qd0_blind_id_fingerprint64_public_id(CDATA->id, crypto->server_idfp, &fpbuflen))
2248 return Crypto_ClientError(data_out, len_out, "d0_blind_id_fingerprint64_public_id failed");
2250 if(CDATA->wantserver_idfp[0])
2251 if(memcmp(CDATA->wantserver_idfp, crypto->server_idfp, sizeof(crypto->server_idfp)))
2254 return Crypto_ClientError(data_out, len_out, "Server ID does not match stored host key, refusing to connect");
2256 fpbuflen = DHKEY_SIZE;
2257 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) crypto->dhkey, &fpbuflen))
2260 return Crypto_ClientError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed");
2263 // cache the server key
2264 Crypto_StoreHostKey(&cls.connect_address, va("%d %s@%s", crypto->use_aes ? 1 : 0, crypto->server_idfp, pubkeys_fp64[CDATA->s]), false);
2268 // client will auth next
2269 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\4\\id\\%d", CDATA->cdata_id));
2270 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
2273 return Crypto_ClientError(data_out, len_out, "d0_blind_id_copy failed");
2275 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
2278 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_start failed");
2280 CDATA->next_step = 5;
2281 data_out_p += *len_out;
2282 *len_out = data_out_p - data_out;
2283 return CRYPTO_DISCARD;
2287 // session key is FINISHED (no server part is to be expected)! By this, all keys are set up
2288 crypto->authenticated = true;
2289 CDATA->next_step = 0;
2290 // assume we got the empty challenge to finish the protocol
2291 PutWithNul(&data_out_p, len_out, "challenge ");
2292 *len_out = data_out_p - data_out;
2293 --*len_out; // remove NUL terminator
2294 return CRYPTO_REPLACE;
2297 else if(!strcmp(cnt, "5"))
2300 unsigned char dhkey[DHKEY_SIZE];
2304 if(CDATA->cdata_id != id)
2305 return Crypto_SoftServerError(data_out, len_out, va("Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
2306 if(CDATA->next_step != 5)
2307 return Crypto_SoftClientError(data_out, len_out, va("Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
2309 cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
2311 if(CDATA->s < 0) // only if server didn't auth
2313 if((s = SearchInfostring(string + 4, "aes")))
2317 if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2318 if(!aes && CDATA->wantserver_aes)
2321 return Crypto_ClientError(data_out, len_out, "Stored host key requires encryption, but server did not enable encryption");
2323 if(aes && (!d0_rijndael_dll || crypto_aeslevel.integer <= 0))
2326 return Crypto_ClientError(data_out, len_out, "Server insists on encryption too hard");
2328 if(!aes && (d0_rijndael_dll && crypto_aeslevel.integer >= 3))
2331 return Crypto_ClientError(data_out, len_out, "Server insists on plaintext too hard");
2333 crypto->use_aes = aes != 0;
2336 PutWithNul(&data_out_p, len_out, va("d0pk\\cnt\\6\\id\\%d", CDATA->cdata_id));
2337 if(!qd0_blind_id_authenticate_with_private_id_response(CDATA->id, data_in, len_in, data_out_p, len_out))
2340 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_response failed");
2342 fpbuflen = DHKEY_SIZE;
2343 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) dhkey, &fpbuflen))
2346 return Crypto_ClientError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed");
2348 // XOR the two DH keys together to make one
2349 for(i = 0; i < DHKEY_SIZE; ++i)
2350 crypto->dhkey[i] ^= dhkey[i];
2351 // session key is FINISHED! By this, all keys are set up
2352 crypto->authenticated = true;
2353 CDATA->next_step = 0;
2354 data_out_p += *len_out;
2355 *len_out = data_out_p - data_out;
2356 return CRYPTO_DISCARD;
2358 return Crypto_SoftClientError(data_out, len_out, "Got unknown d0_blind_id message from server");
2361 return CRYPTO_NOMATCH;
2364 size_t Crypto_SignData(const void *data, size_t datasize, int keyid, void *signed_data, size_t signed_size)
2366 if(keyid < 0 || keyid >= MAX_PUBKEYS)
2368 if(!pubkeys_havepriv[keyid])
2370 if(qd0_blind_id_sign_with_private_id_sign(pubkeys[keyid], true, false, (char *)data, datasize, (char *)signed_data, &signed_size))