1 // TODO key loading, generating, saving
10 cvar_t crypto_developer = {CVAR_SAVE, "crypto_developer", "0", "print extra info about crypto handshake"};
11 cvar_t crypto_servercpupercent = {CVAR_SAVE, "crypto_servercpupercent", "10", "allowed crypto CPU load in percent for server operation (0 = no limit, faster)"};
12 cvar_t crypto_servercpumaxtime = {CVAR_SAVE, "crypto_servercpumaxtime", "0.01", "maximum allowed crypto CPU time per frame (0 = no limit)"};
13 cvar_t crypto_servercpudebug = {CVAR_SAVE, "crypto_servercpudebug", "0", "print statistics about time usage by crypto"};
14 static double crypto_servercpu_accumulator = 0;
15 static double crypto_servercpu_lastrealtime = 0;
16 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)"};
17 int crypto_keyfp_recommended_length;
18 static const char *crypto_idstring = NULL;
19 static char crypto_idstring_buf[512];
21 #define PROTOCOL_D0_BLIND_ID FOURCC_D0PK
22 #define PROTOCOL_VLEN (('v' << 0) | ('l' << 8) | ('e' << 16) | ('n' << 24))
24 // BEGIN stuff shared with crypto-keygen-standalone
25 #define FOURCC_D0PK (('d' << 0) | ('0' << 8) | ('p' << 16) | ('k' << 24))
26 #define FOURCC_D0SK (('d' << 0) | ('0' << 8) | ('s' << 16) | ('k' << 24))
27 #define FOURCC_D0PI (('d' << 0) | ('0' << 8) | ('p' << 16) | ('i' << 24))
28 #define FOURCC_D0SI (('d' << 0) | ('0' << 8) | ('s' << 16) | ('i' << 24))
29 #define FOURCC_D0IQ (('d' << 0) | ('0' << 8) | ('i' << 16) | ('q' << 24))
30 #define FOURCC_D0IR (('d' << 0) | ('0' << 8) | ('i' << 16) | ('r' << 24))
31 #define FOURCC_D0ER (('d' << 0) | ('0' << 8) | ('e' << 16) | ('r' << 24))
32 #define FOURCC_D0IC (('d' << 0) | ('0' << 8) | ('i' << 16) | ('c' << 24))
34 static unsigned long Crypto_LittleLong(const char *data)
37 ((unsigned char) data[0]) |
38 (((unsigned char) data[1]) << 8) |
39 (((unsigned char) data[2]) << 16) |
40 (((unsigned char) data[3]) << 24);
43 static void Crypto_UnLittleLong(char *data, unsigned long l)
46 data[1] = (l >> 8) & 0xFF;
47 data[2] = (l >> 16) & 0xFF;
48 data[3] = (l >> 24) & 0xFF;
51 static size_t Crypto_ParsePack(const char *buf, size_t len, unsigned long header, const char **lumps, size_t *lumpsize, size_t nlumps)
60 if(Crypto_LittleLong(buf) != header)
64 for(i = 0; i < nlumps; ++i)
68 lumpsize[i] = Crypto_LittleLong(&buf[pos]);
70 if(pos + lumpsize[i] > len)
78 static size_t Crypto_UnParsePack(char *buf, size_t len, unsigned long header, const char *const *lumps, const size_t *lumpsize, size_t nlumps)
87 Crypto_UnLittleLong(buf, header);
90 for(i = 0; i < nlumps; ++i)
92 if(pos + 4 + lumpsize[i] > len)
94 Crypto_UnLittleLong(&buf[pos], lumpsize[i]);
96 memcpy(&buf[pos], lumps[i], lumpsize[i]);
101 // END stuff shared with xonotic-keygen
107 #include <d0_blind_id/d0_blind_id.h>
109 #define d0_blind_id_dll 1
110 #define Crypto_OpenLibrary() true
111 #define Crypto_CloseLibrary()
113 #define qd0_blind_id_new d0_blind_id_new
114 #define qd0_blind_id_free d0_blind_id_free
115 //#define qd0_blind_id_clear d0_blind_id_clear
116 #define qd0_blind_id_copy d0_blind_id_copy
117 //#define qd0_blind_id_generate_private_key d0_blind_id_generate_private_key
118 //#define qd0_blind_id_generate_private_key_fastreject d0_blind_id_generate_private_key_fastreject
119 //#define qd0_blind_id_read_private_key d0_blind_id_read_private_key
120 #define qd0_blind_id_read_public_key d0_blind_id_read_public_key
121 //#define qd0_blind_id_write_private_key d0_blind_id_write_private_key
122 //#define qd0_blind_id_write_public_key d0_blind_id_write_public_key
123 #define qd0_blind_id_fingerprint64_public_key d0_blind_id_fingerprint64_public_key
124 //#define qd0_blind_id_generate_private_id_modulus d0_blind_id_generate_private_id_modulus
125 #define qd0_blind_id_read_private_id_modulus d0_blind_id_read_private_id_modulus
126 //#define qd0_blind_id_write_private_id_modulus d0_blind_id_write_private_id_modulus
127 #define qd0_blind_id_generate_private_id_start d0_blind_id_generate_private_id_start
128 #define qd0_blind_id_generate_private_id_request d0_blind_id_generate_private_id_request
129 //#define qd0_blind_id_answer_private_id_request d0_blind_id_answer_private_id_request
130 #define qd0_blind_id_finish_private_id_request d0_blind_id_finish_private_id_request
131 //#define qd0_blind_id_read_private_id_request_camouflage d0_blind_id_read_private_id_request_camouflage
132 //#define qd0_blind_id_write_private_id_request_camouflage d0_blind_id_write_private_id_request_camouflage
133 #define qd0_blind_id_read_private_id d0_blind_id_read_private_id
134 //#define qd0_blind_id_read_public_id d0_blind_id_read_public_id
135 #define qd0_blind_id_write_private_id d0_blind_id_write_private_id
136 //#define qd0_blind_id_write_public_id d0_blind_id_write_public_id
137 #define qd0_blind_id_authenticate_with_private_id_start d0_blind_id_authenticate_with_private_id_start
138 #define qd0_blind_id_authenticate_with_private_id_challenge d0_blind_id_authenticate_with_private_id_challenge
139 #define qd0_blind_id_authenticate_with_private_id_response d0_blind_id_authenticate_with_private_id_response
140 #define qd0_blind_id_authenticate_with_private_id_verify d0_blind_id_authenticate_with_private_id_verify
141 #define qd0_blind_id_fingerprint64_public_id d0_blind_id_fingerprint64_public_id
142 #define qd0_blind_id_sessionkey_public_id d0_blind_id_sessionkey_public_id
143 #define qd0_blind_id_INITIALIZE d0_blind_id_INITIALIZE
144 #define qd0_blind_id_SHUTDOWN d0_blind_id_SHUTDOWN
145 #define qd0_blind_id_util_sha256 d0_blind_id_util_sha256
146 #define qd0_blind_id_sign_with_private_id_sign d0_blind_id_sign_with_private_id_sign
147 #define qd0_blind_id_sign_with_private_id_sign_detached d0_blind_id_sign_with_private_id_sign_detached
148 #define qd0_blind_id_setmallocfuncs d0_blind_id_setmallocfuncs
149 #define qd0_blind_id_setmutexfuncs d0_blind_id_setmutexfuncs
150 #define qd0_blind_id_verify_public_id d0_bind_id_verify_public_id
151 #define qd0_blind_id_verify_private_id d0_bind_id_verify_private_id
155 // d0_blind_id interface
158 #define D0_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
160 #define D0_WARN_UNUSED_RESULT
164 typedef void *(d0_malloc_t)(size_t len);
165 typedef void (d0_free_t)(void *p);
166 typedef void *(d0_createmutex_t)(void);
167 typedef void (d0_destroymutex_t)(void *);
168 typedef int (d0_lockmutex_t)(void *); // zero on success
169 typedef int (d0_unlockmutex_t)(void *); // zero on success
171 typedef struct d0_blind_id_s d0_blind_id_t;
172 typedef D0_BOOL (*d0_fastreject_function) (const d0_blind_id_t *ctx, void *pass);
173 static D0_EXPORT D0_WARN_UNUSED_RESULT d0_blind_id_t *(*qd0_blind_id_new) (void);
174 static D0_EXPORT void (*qd0_blind_id_free) (d0_blind_id_t *a);
175 //static D0_EXPORT void (*qd0_blind_id_clear) (d0_blind_id_t *ctx);
176 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_copy) (d0_blind_id_t *ctx, const d0_blind_id_t *src);
177 //static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_generate_private_key) (d0_blind_id_t *ctx, int k);
178 //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);
179 //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);
180 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);
181 //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);
182 //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);
183 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);
184 //static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_generate_private_id_modulus) (d0_blind_id_t *ctx);
185 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);
186 //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);
187 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_generate_private_id_start) (d0_blind_id_t *ctx);
188 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);
189 //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);
190 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);
191 //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);
192 //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);
193 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);
194 //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);
195 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);
196 //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);
197 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);
198 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);
199 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);
200 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);
201 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);
202 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
203 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_INITIALIZE) (void);
204 static D0_EXPORT void (*qd0_blind_id_SHUTDOWN) (void);
205 static D0_EXPORT void (*qd0_blind_id_util_sha256) (char *out, const char *in, size_t n);
206 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);
207 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);
208 static D0_EXPORT void (*qd0_blind_id_setmallocfuncs)(d0_malloc_t *m, d0_free_t *f);
209 static D0_EXPORT void (*qd0_blind_id_setmutexfuncs)(d0_createmutex_t *c, d0_destroymutex_t *d, d0_lockmutex_t *l, d0_unlockmutex_t *u);
210 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_verify_public_id)(const d0_blind_id_t *ctx, D0_BOOL *status);
211 static D0_EXPORT D0_WARN_UNUSED_RESULT D0_BOOL (*qd0_blind_id_verify_private_id)(const d0_blind_id_t *ctx);
212 static dllfunction_t d0_blind_id_funcs[] =
214 {"d0_blind_id_new", (void **) &qd0_blind_id_new},
215 {"d0_blind_id_free", (void **) &qd0_blind_id_free},
216 //{"d0_blind_id_clear", (void **) &qd0_blind_id_clear},
217 {"d0_blind_id_copy", (void **) &qd0_blind_id_copy},
218 //{"d0_blind_id_generate_private_key", (void **) &qd0_blind_id_generate_private_key},
219 //{"d0_blind_id_generate_private_key_fastreject", (void **) &qd0_blind_id_generate_private_key_fastreject},
220 //{"d0_blind_id_read_private_key", (void **) &qd0_blind_id_read_private_key},
221 {"d0_blind_id_read_public_key", (void **) &qd0_blind_id_read_public_key},
222 //{"d0_blind_id_write_private_key", (void **) &qd0_blind_id_write_private_key},
223 //{"d0_blind_id_write_public_key", (void **) &qd0_blind_id_write_public_key},
224 {"d0_blind_id_fingerprint64_public_key", (void **) &qd0_blind_id_fingerprint64_public_key},
225 //{"d0_blind_id_generate_private_id_modulus", (void **) &qd0_blind_id_generate_private_id_modulus},
226 {"d0_blind_id_read_private_id_modulus", (void **) &qd0_blind_id_read_private_id_modulus},
227 //{"d0_blind_id_write_private_id_modulus", (void **) &qd0_blind_id_write_private_id_modulus},
228 {"d0_blind_id_generate_private_id_start", (void **) &qd0_blind_id_generate_private_id_start},
229 {"d0_blind_id_generate_private_id_request", (void **) &qd0_blind_id_generate_private_id_request},
230 //{"d0_blind_id_answer_private_id_request", (void **) &qd0_blind_id_answer_private_id_request},
231 {"d0_blind_id_finish_private_id_request", (void **) &qd0_blind_id_finish_private_id_request},
232 //{"d0_blind_id_read_private_id_request_camouflage", (void **) &qd0_blind_id_read_private_id_request_camouflage},
233 //{"d0_blind_id_write_private_id_request_camouflage", (void **) &qd0_blind_id_write_private_id_request_camouflage},
234 {"d0_blind_id_read_private_id", (void **) &qd0_blind_id_read_private_id},
235 //{"d0_blind_id_read_public_id", (void **) &qd0_blind_id_read_public_id},
236 {"d0_blind_id_write_private_id", (void **) &qd0_blind_id_write_private_id},
237 //{"d0_blind_id_write_public_id", (void **) &qd0_blind_id_write_public_id},
238 {"d0_blind_id_authenticate_with_private_id_start", (void **) &qd0_blind_id_authenticate_with_private_id_start},
239 {"d0_blind_id_authenticate_with_private_id_challenge", (void **) &qd0_blind_id_authenticate_with_private_id_challenge},
240 {"d0_blind_id_authenticate_with_private_id_response", (void **) &qd0_blind_id_authenticate_with_private_id_response},
241 {"d0_blind_id_authenticate_with_private_id_verify", (void **) &qd0_blind_id_authenticate_with_private_id_verify},
242 {"d0_blind_id_fingerprint64_public_id", (void **) &qd0_blind_id_fingerprint64_public_id},
243 {"d0_blind_id_sessionkey_public_id", (void **) &qd0_blind_id_sessionkey_public_id},
244 {"d0_blind_id_INITIALIZE", (void **) &qd0_blind_id_INITIALIZE},
245 {"d0_blind_id_SHUTDOWN", (void **) &qd0_blind_id_SHUTDOWN},
246 {"d0_blind_id_util_sha256", (void **) &qd0_blind_id_util_sha256},
247 {"d0_blind_id_sign_with_private_id_sign", (void **) &qd0_blind_id_sign_with_private_id_sign},
248 {"d0_blind_id_sign_with_private_id_sign_detached", (void **) &qd0_blind_id_sign_with_private_id_sign_detached},
249 {"d0_blind_id_setmallocfuncs", (void **) &qd0_blind_id_setmallocfuncs},
250 {"d0_blind_id_setmutexfuncs", (void **) &qd0_blind_id_setmutexfuncs},
251 {"d0_blind_id_verify_public_id", (void **) &qd0_blind_id_verify_public_id},
252 {"d0_blind_id_verify_private_id", (void **) &qd0_blind_id_verify_private_id},
255 // end of d0_blind_id interface
257 static dllhandle_t d0_blind_id_dll = NULL;
258 static qboolean Crypto_OpenLibrary (void)
260 const char* dllnames [] =
263 "libd0_blind_id-0.dll",
264 #elif defined(MACOSX)
265 "libd0_blind_id.0.dylib",
267 "libd0_blind_id.so.0",
268 "libd0_blind_id.so", // FreeBSD
278 return Sys_LoadLibrary (dllnames, &d0_blind_id_dll, d0_blind_id_funcs);
281 static void Crypto_CloseLibrary (void)
283 Sys_UnloadLibrary (&d0_blind_id_dll);
288 #ifdef CRYPTO_RIJNDAEL_STATIC
290 #include <d0_blind_id/d0_rijndael.h>
292 #define d0_rijndael_dll 1
293 #define Crypto_Rijndael_OpenLibrary() true
294 #define Crypto_Rijndael_CloseLibrary()
296 #define qd0_rijndael_setup_encrypt d0_rijndael_setup_encrypt
297 #define qd0_rijndael_setup_decrypt d0_rijndael_setup_decrypt
298 #define qd0_rijndael_encrypt d0_rijndael_encrypt
299 #define qd0_rijndael_decrypt d0_rijndael_decrypt
303 // no need to do the #define dance here, as the upper part declares out macros either way
305 D0_EXPORT int (*qd0_rijndael_setup_encrypt) (unsigned long *rk, const unsigned char *key,
307 D0_EXPORT int (*qd0_rijndael_setup_decrypt) (unsigned long *rk, const unsigned char *key,
309 D0_EXPORT void (*qd0_rijndael_encrypt) (const unsigned long *rk, int nrounds,
310 const unsigned char plaintext[16], unsigned char ciphertext[16]);
311 D0_EXPORT void (*qd0_rijndael_decrypt) (const unsigned long *rk, int nrounds,
312 const unsigned char ciphertext[16], unsigned char plaintext[16]);
313 #define D0_RIJNDAEL_KEYLENGTH(keybits) ((keybits)/8)
314 #define D0_RIJNDAEL_RKLENGTH(keybits) ((keybits)/8+28)
315 #define D0_RIJNDAEL_NROUNDS(keybits) ((keybits)/32+6)
316 static dllfunction_t d0_rijndael_funcs[] =
318 {"d0_rijndael_setup_decrypt", (void **) &qd0_rijndael_setup_decrypt},
319 {"d0_rijndael_setup_encrypt", (void **) &qd0_rijndael_setup_encrypt},
320 {"d0_rijndael_decrypt", (void **) &qd0_rijndael_decrypt},
321 {"d0_rijndael_encrypt", (void **) &qd0_rijndael_encrypt},
324 // end of d0_blind_id interface
326 static dllhandle_t d0_rijndael_dll = NULL;
327 static qboolean Crypto_Rijndael_OpenLibrary (void)
329 const char* dllnames [] =
332 "libd0_rijndael-0.dll",
333 #elif defined(MACOSX)
334 "libd0_rijndael.0.dylib",
336 "libd0_rijndael.so.0",
337 "libd0_rijndael.so", // FreeBSD
347 return Sys_LoadLibrary (dllnames, &d0_rijndael_dll, d0_rijndael_funcs);
350 static void Crypto_Rijndael_CloseLibrary (void)
352 Sys_UnloadLibrary (&d0_rijndael_dll);
358 void sha256(unsigned char *out, const unsigned char *in, int n)
360 qd0_blind_id_util_sha256((char *) out, (const char *) in, n);
363 static size_t Crypto_LoadFile(const char *path, char *buf, size_t nmax, qboolean inuserdir)
369 f = FS_SysOpen(va(vabuf, sizeof(vabuf), "%s%s", *fs_userdir ? fs_userdir : fs_basedir, path), "rb", false);
371 f = FS_SysOpen(va(vabuf, sizeof(vabuf), "%s%s", fs_basedir, path), "rb", false);
374 n = FS_Read(f, buf, nmax);
381 static qboolean PutWithNul(char **data, size_t *len, const char *str)
383 // invariant: data points to insertion point
384 size_t l = strlen(str);
387 memcpy(*data, str, l+1);
393 static const char *GetUntilNul(const char **data, size_t *len)
395 // invariant: data points to next character to take
396 const char *data_save = *data;
409 p = (const char *) memchr(*data, 0, *len);
410 if(!p) // no terminating NUL
423 return (const char *) data_save;
430 static d0_blind_id_t *Crypto_ReadPublicKey(char *buf, size_t len)
432 d0_blind_id_t *pk = NULL;
435 if(Crypto_ParsePack(buf, len, FOURCC_D0PK, p, l, 2))
437 pk = qd0_blind_id_new();
439 if(qd0_blind_id_read_public_key(pk, p[0], l[0]))
440 if(qd0_blind_id_read_private_id_modulus(pk, p[1], l[1]))
444 qd0_blind_id_free(pk);
449 static qboolean Crypto_AddPrivateKey(d0_blind_id_t *pk, char *buf, size_t len)
453 if(Crypto_ParsePack(buf, len, FOURCC_D0SI, p, l, 1))
455 if(qd0_blind_id_read_private_id(pk, p[0], l[0]))
461 #define MAX_PUBKEYS 16
462 static d0_blind_id_t *pubkeys[MAX_PUBKEYS];
463 static char pubkeys_fp64[MAX_PUBKEYS][FP64_SIZE+1];
464 static qboolean pubkeys_havepriv[MAX_PUBKEYS];
465 static qboolean pubkeys_havesig[MAX_PUBKEYS];
466 static char pubkeys_priv_fp64[MAX_PUBKEYS][FP64_SIZE+1];
467 static char challenge_append[1400];
468 static size_t challenge_append_length;
470 static int keygen_i = -1;
471 static char keygen_buf[8192];
473 #define MAX_CRYPTOCONNECTS 16
474 #define CRYPTOCONNECT_NONE 0
475 #define CRYPTOCONNECT_PRECONNECT 1
476 #define CRYPTOCONNECT_CONNECT 2
477 #define CRYPTOCONNECT_RECONNECT 3
478 #define CRYPTOCONNECT_DUPLICATE 4
479 typedef struct server_cryptoconnect_s
482 lhnetaddress_t address;
486 server_cryptoconnect_t;
487 static server_cryptoconnect_t cryptoconnects[MAX_CRYPTOCONNECTS];
489 static int cdata_id = 0;
495 char challenge[2048];
496 char wantserver_idfp[FP64_SIZE+1];
497 qboolean wantserver_aes;
502 // crypto specific helpers
503 #define CDATA ((crypto_data_t *) crypto->data)
504 #define MAKE_CDATA if(!crypto->data) crypto->data = Z_Malloc(sizeof(crypto_data_t))
505 #define CLEAR_CDATA if(crypto->data) { if(CDATA->id) qd0_blind_id_free(CDATA->id); Z_Free(crypto->data); } crypto->data = NULL
507 static crypto_t *Crypto_ServerFindInstance(lhnetaddress_t *peeraddress, qboolean allow_create)
513 return NULL; // no support
515 for(i = 0; i < MAX_CRYPTOCONNECTS; ++i)
516 if(LHNETADDRESS_Compare(peeraddress, &cryptoconnects[i].address))
518 if(i < MAX_CRYPTOCONNECTS && (allow_create || cryptoconnects[i].crypto.data))
520 crypto = &cryptoconnects[i].crypto;
521 cryptoconnects[i].lasttime = realtime;
527 for(i = 1; i < MAX_CRYPTOCONNECTS; ++i)
528 if(cryptoconnects[i].lasttime < cryptoconnects[best].lasttime)
530 crypto = &cryptoconnects[best].crypto;
531 cryptoconnects[best].lasttime = realtime;
532 memcpy(&cryptoconnects[best].address, peeraddress, sizeof(cryptoconnects[best].address));
537 qboolean Crypto_ServerFinishInstance(crypto_t *out, crypto_t *crypto)
539 // no check needed here (returned pointers are only used in prefilled fields)
540 if(!crypto || !crypto->authenticated)
542 Con_Printf("Passed an invalid crypto connect instance\n");
543 memset(out, 0, sizeof(*out));
547 memcpy(out, crypto, sizeof(*out));
548 memset(crypto, 0, sizeof(crypto));
552 crypto_t *Crypto_ServerGetInstance(lhnetaddress_t *peeraddress)
554 // no check needed here (returned pointers are only used in prefilled fields)
555 return Crypto_ServerFindInstance(peeraddress, false);
558 typedef struct crypto_storedhostkey_s
560 struct crypto_storedhostkey_s *next;
563 char idfp[FP64_SIZE+1];
566 crypto_storedhostkey_t;
567 static crypto_storedhostkey_t *crypto_storedhostkey_hashtable[CRYPTO_HOSTKEY_HASHSIZE];
569 static void Crypto_InitHostKeys(void)
572 for(i = 0; i < CRYPTO_HOSTKEY_HASHSIZE; ++i)
573 crypto_storedhostkey_hashtable[i] = NULL;
576 static void Crypto_ClearHostKeys(void)
579 crypto_storedhostkey_t *hk, *hkn;
580 for(i = 0; i < CRYPTO_HOSTKEY_HASHSIZE; ++i)
582 for(hk = crypto_storedhostkey_hashtable[i]; hk; hk = hkn)
587 crypto_storedhostkey_hashtable[i] = NULL;
591 static qboolean Crypto_ClearHostKey(lhnetaddress_t *peeraddress)
595 crypto_storedhostkey_t **hkp;
596 qboolean found = false;
598 LHNETADDRESS_ToString(peeraddress, buf, sizeof(buf), 1);
599 hashindex = CRC_Block((const unsigned char *) buf, strlen(buf)) % CRYPTO_HOSTKEY_HASHSIZE;
600 for(hkp = &crypto_storedhostkey_hashtable[hashindex]; *hkp && LHNETADDRESS_Compare(&((*hkp)->addr), peeraddress); hkp = &((*hkp)->next));
604 crypto_storedhostkey_t *hk = *hkp;
613 static void Crypto_StoreHostKey(lhnetaddress_t *peeraddress, const char *keystring, qboolean complain)
617 crypto_storedhostkey_t *hk;
619 char idfp[FP64_SIZE+1];
625 // syntax of keystring:
626 // aeslevel id@key id@key ...
630 aeslevel = bound(0, *keystring - '0', 3);
631 while(*keystring && *keystring != ' ')
635 while(*keystring && keyid < 0)
638 const char *idstart, *idend, *keystart, *keyend;
639 ++keystring; // skip the space
641 while(*keystring && *keystring != ' ' && *keystring != '@')
647 keystart = keystring;
648 while(*keystring && *keystring != ' ')
652 if(idend - idstart == FP64_SIZE && keyend - keystart == FP64_SIZE)
654 for(keyid = 0; keyid < MAX_PUBKEYS; ++keyid)
656 if(!memcmp(pubkeys_fp64[keyid], keystart, FP64_SIZE))
658 memcpy(idfp, idstart, FP64_SIZE);
662 if(keyid >= MAX_PUBKEYS)
670 LHNETADDRESS_ToString(peeraddress, buf, sizeof(buf), 1);
671 hashindex = CRC_Block((const unsigned char *) buf, strlen(buf)) % CRYPTO_HOSTKEY_HASHSIZE;
672 for(hk = crypto_storedhostkey_hashtable[hashindex]; hk && LHNETADDRESS_Compare(&hk->addr, peeraddress); hk = hk->next);
678 if(hk->keyid != keyid || memcmp(hk->idfp, idfp, FP64_SIZE+1))
679 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);
680 if(hk->aeslevel > aeslevel)
681 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);
683 hk->aeslevel = max(aeslevel, hk->aeslevel);
687 // great, we did NOT have it yet
688 hk = (crypto_storedhostkey_t *) Z_Malloc(sizeof(*hk));
689 memcpy(&hk->addr, peeraddress, sizeof(hk->addr));
691 memcpy(hk->idfp, idfp, FP64_SIZE+1);
692 hk->next = crypto_storedhostkey_hashtable[hashindex];
693 hk->aeslevel = aeslevel;
694 crypto_storedhostkey_hashtable[hashindex] = hk;
697 qboolean Crypto_RetrieveHostKey(lhnetaddress_t *peeraddress, int *keyid, char *keyfp, size_t keyfplen, char *idfp, size_t idfplen, int *aeslevel)
701 crypto_storedhostkey_t *hk;
706 LHNETADDRESS_ToString(peeraddress, buf, sizeof(buf), 1);
707 hashindex = CRC_Block((const unsigned char *) buf, strlen(buf)) % CRYPTO_HOSTKEY_HASHSIZE;
708 for(hk = crypto_storedhostkey_hashtable[hashindex]; hk && LHNETADDRESS_Compare(&hk->addr, peeraddress); hk = hk->next);
716 strlcpy(keyfp, pubkeys_fp64[hk->keyid], keyfplen);
718 strlcpy(idfp, hk->idfp, idfplen);
720 *aeslevel = hk->aeslevel;
724 int Crypto_RetrieveLocalKey(int keyid, char *keyfp, size_t keyfplen, char *idfp, size_t idfplen, qboolean *issigned) // return value: -1 if more to come, +1 if valid, 0 if end of list
726 if(keyid < 0 || keyid >= MAX_PUBKEYS)
735 strlcpy(keyfp, pubkeys_fp64[keyid], keyfplen);
737 if(pubkeys_havepriv[keyid])
738 strlcpy(idfp, pubkeys_priv_fp64[keyid], keyfplen);
740 *issigned = pubkeys_havesig[keyid];
745 // init/shutdown code
746 static void Crypto_BuildChallengeAppend(void)
748 char *p, *lengthptr, *startptr;
751 p = challenge_append;
752 n = sizeof(challenge_append);
753 Crypto_UnLittleLong(p, PROTOCOL_VLEN);
757 Crypto_UnLittleLong(p, 0);
760 Crypto_UnLittleLong(p, PROTOCOL_D0_BLIND_ID);
764 for(i = 0; i < MAX_PUBKEYS; ++i)
765 if(pubkeys_havepriv[i])
766 PutWithNul(&p, &n, pubkeys_fp64[i]);
767 PutWithNul(&p, &n, "");
768 for(i = 0; i < MAX_PUBKEYS; ++i)
769 if(!pubkeys_havepriv[i] && pubkeys[i])
770 PutWithNul(&p, &n, pubkeys_fp64[i]);
771 Crypto_UnLittleLong(lengthptr, p - startptr);
772 challenge_append_length = p - challenge_append;
775 void Crypto_LoadKeys(void)
782 if(!d0_blind_id_dll) // don't if we can't
785 if(crypto_idstring) // already loaded? then not
788 Host_LockSession(); // we use the session ID here
791 // note: we are just a CLIENT
793 // PUBLIC KEYS to accept (including modulus)
794 // PRIVATE KEY of user
796 crypto_idstring = NULL;
797 dpsnprintf(crypto_idstring_buf, sizeof(crypto_idstring_buf), "%d", d0_rijndael_dll ? crypto_aeslevel.integer : 0);
798 for(i = 0; i < MAX_PUBKEYS; ++i)
800 memset(pubkeys_fp64[i], 0, sizeof(pubkeys_fp64[i]));
801 memset(pubkeys_priv_fp64[i], 0, sizeof(pubkeys_fp64[i]));
802 pubkeys_havepriv[i] = false;
803 pubkeys_havesig[i] = false;
804 len = Crypto_LoadFile(va(vabuf, sizeof(vabuf), "key_%d.d0pk", i), buf, sizeof(buf), false);
805 if((pubkeys[i] = Crypto_ReadPublicKey(buf, len)))
808 if(qd0_blind_id_fingerprint64_public_key(pubkeys[i], pubkeys_fp64[i], &len2)) // keeps final NUL
810 Con_Printf("Loaded public key key_%d.d0pk (fingerprint: %s)\n", i, pubkeys_fp64[i]);
811 len = Crypto_LoadFile(va(vabuf, sizeof(vabuf), "key_%d.d0si%s", i, sessionid.string), buf, sizeof(buf), true);
814 if(Crypto_AddPrivateKey(pubkeys[i], buf, len))
817 if(qd0_blind_id_fingerprint64_public_id(pubkeys[i], pubkeys_priv_fp64[i], &len2)) // keeps final NUL
822 Con_Printf("Loaded private ID key_%d.d0si%s for key_%d.d0pk (public key fingerprint: %s)\n", i, sessionid.string, i, pubkeys_priv_fp64[i]);
824 f = FS_SysOpen(va(vabuf, sizeof(vabuf), "%skey_%d-public-fp%s.txt", *fs_userdir ? fs_userdir : fs_basedir, i, sessionid.string), "w", false);
827 // we ignore errors for this file, as it's not necessary to have
828 FS_Write(f, pubkeys_priv_fp64[i], FP64_SIZE);
829 FS_Write(f, "\n", 1);
833 // verify the key we just loaded (just in case)
834 if(qd0_blind_id_verify_private_id(pubkeys[i]) && qd0_blind_id_verify_public_id(pubkeys[i], &status))
836 pubkeys_havepriv[i] = true;
837 strlcat(crypto_idstring_buf, va(vabuf, sizeof(vabuf), " %s@%s", pubkeys_priv_fp64[i], pubkeys_fp64[i]), sizeof(crypto_idstring_buf));
839 // verify the key we just got (just in case)
841 pubkeys_havesig[i] = true;
843 Con_Printf("NOTE: this ID has not yet been signed!\n");
847 Con_Printf("d0_blind_id_verify_private_id failed, this is not a valid key!\n");
848 qd0_blind_id_free(pubkeys[i]);
854 Con_Printf("d0_blind_id_fingerprint64_public_id failed\n");
855 qd0_blind_id_free(pubkeys[i]);
863 // can't really happen
864 qd0_blind_id_free(pubkeys[i]);
869 crypto_idstring = crypto_idstring_buf;
872 Crypto_BuildChallengeAppend();
874 // find a good prefix length for all the keys we know (yes, algorithm is not perfect yet, may yield too long prefix length)
875 crypto_keyfp_recommended_length = 0;
876 memset(buf+256, 0, MAX_PUBKEYS + MAX_PUBKEYS);
877 while(crypto_keyfp_recommended_length < FP64_SIZE)
880 for(i = 0; i < MAX_PUBKEYS; ++i)
884 ++buf[(unsigned char) pubkeys_fp64[i][crypto_keyfp_recommended_length]];
885 if(pubkeys_havepriv[i])
886 if(!buf[256 + MAX_PUBKEYS + i])
887 ++buf[(unsigned char) pubkeys_priv_fp64[i][crypto_keyfp_recommended_length]];
889 for(i = 0; i < MAX_PUBKEYS; ++i)
893 if(buf[(unsigned char) pubkeys_fp64[i][crypto_keyfp_recommended_length]] < 2)
895 if(pubkeys_havepriv[i])
896 if(!buf[256 + MAX_PUBKEYS + i])
897 if(buf[(unsigned char) pubkeys_priv_fp64[i][crypto_keyfp_recommended_length]] < 2)
898 buf[256 + MAX_PUBKEYS + i] = 1;
900 ++crypto_keyfp_recommended_length;
901 for(i = 0; i < MAX_PUBKEYS; ++i)
906 if(pubkeys_havepriv[i])
907 if(!buf[256 + MAX_PUBKEYS + i])
913 if(crypto_keyfp_recommended_length < 7)
914 crypto_keyfp_recommended_length = 7;
917 static void Crypto_UnloadKeys(void)
922 for(i = 0; i < MAX_PUBKEYS; ++i)
925 qd0_blind_id_free(pubkeys[i]);
927 pubkeys_havepriv[i] = false;
928 pubkeys_havesig[i] = false;
929 memset(pubkeys_fp64[i], 0, sizeof(pubkeys_fp64[i]));
930 memset(pubkeys_priv_fp64[i], 0, sizeof(pubkeys_fp64[i]));
931 challenge_append_length = 0;
933 crypto_idstring = NULL;
936 static mempool_t *cryptomempool;
942 static void *Crypto_d0_malloc(size_t len)
944 return Mem_Alloc(cryptomempool, len);
947 static void Crypto_d0_free(void *p)
952 static void *Crypto_d0_createmutex(void)
954 return Thread_CreateMutex();
957 static void Crypto_d0_destroymutex(void *m)
959 Thread_DestroyMutex(m);
962 static int Crypto_d0_lockmutex(void *m)
964 return Thread_LockMutex(m);
967 static int Crypto_d0_unlockmutex(void *m)
969 return Thread_UnlockMutex(m);
975 void Crypto_Shutdown(void)
980 Crypto_Rijndael_CloseLibrary();
985 for(i = 0; i < MAX_CRYPTOCONNECTS; ++i)
987 crypto = &cryptoconnects[i].crypto;
990 memset(cryptoconnects, 0, sizeof(cryptoconnects));
991 crypto = &cls.crypto;
996 qd0_blind_id_SHUTDOWN();
998 Crypto_CloseLibrary();
1001 Mem_FreePool(&cryptomempool);
1004 void Crypto_Init(void)
1006 cryptomempool = Mem_AllocPool("crypto", 0, NULL);
1008 if(!Crypto_OpenLibrary())
1011 qd0_blind_id_setmallocfuncs(Crypto_d0_malloc, Crypto_d0_free);
1012 if (Thread_HasThreads())
1013 qd0_blind_id_setmutexfuncs(Crypto_d0_createmutex, Crypto_d0_destroymutex, Crypto_d0_lockmutex, Crypto_d0_unlockmutex);
1015 if(!qd0_blind_id_INITIALIZE())
1017 Crypto_Rijndael_CloseLibrary();
1018 Crypto_CloseLibrary();
1019 Con_Printf("libd0_blind_id initialization FAILED, cryptography support has been disabled\n");
1023 Crypto_Rijndael_OpenLibrary(); // if this fails, it's uncritical
1025 Crypto_InitHostKeys();
1029 qboolean Crypto_Available(void)
1031 if(!d0_blind_id_dll)
1037 static void Crypto_KeyGen_Finished(int code, size_t length_received, unsigned char *buffer, void *cbdata)
1041 static char buf[8192];
1042 static char buf2[8192];
1048 SV_LockThreadMutex();
1050 if(!d0_blind_id_dll)
1052 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1054 SV_UnlockThreadMutex();
1058 if(keygen_i >= MAX_PUBKEYS || !pubkeys[keygen_i])
1060 Con_Printf("overflow of keygen_i\n");
1062 SV_UnlockThreadMutex();
1067 Con_Printf("Unexpected response from keygen server:\n");
1068 Com_HexDumpToConsole(buffer, length_received);
1069 SV_UnlockThreadMutex();
1072 if(!Crypto_ParsePack((const char *) buffer, length_received, FOURCC_D0IR, p, l, 1))
1074 if(length_received >= 5 && Crypto_LittleLong((const char *) buffer) == FOURCC_D0ER)
1076 Con_Printf("Error response from keygen server: %.*s\n", (int)(length_received - 5), buffer + 5);
1080 Con_Printf("Invalid response from keygen server:\n");
1081 Com_HexDumpToConsole(buffer, length_received);
1084 SV_UnlockThreadMutex();
1087 if(!qd0_blind_id_finish_private_id_request(pubkeys[keygen_i], p[0], l[0]))
1089 Con_Printf("d0_blind_id_finish_private_id_request failed\n");
1091 SV_UnlockThreadMutex();
1095 // verify the key we just got (just in case)
1096 if(!qd0_blind_id_verify_public_id(pubkeys[keygen_i], &status) || !status)
1098 Con_Printf("d0_blind_id_verify_public_id failed\n");
1100 SV_UnlockThreadMutex();
1104 // we have a valid key now!
1105 // make the rest of crypto.c know that
1106 Con_Printf("Received signature for private ID key_%d.d0pk (public key fingerprint: %s)\n", keygen_i, pubkeys_priv_fp64[keygen_i]);
1107 pubkeys_havesig[keygen_i] = true;
1109 // write the key to disk
1112 if(!qd0_blind_id_write_private_id(pubkeys[keygen_i], buf, &l[0]))
1114 Con_Printf("d0_blind_id_write_private_id failed\n");
1116 SV_UnlockThreadMutex();
1119 if(!(buf2size = Crypto_UnParsePack(buf2, sizeof(buf2), FOURCC_D0SI, p, l, 1)))
1121 Con_Printf("Crypto_UnParsePack failed\n");
1123 SV_UnlockThreadMutex();
1127 FS_CreatePath(va(vabuf, sizeof(vabuf), "%skey_%d.d0si%s", *fs_userdir ? fs_userdir : fs_basedir, keygen_i, sessionid.string));
1128 f = FS_SysOpen(va(vabuf, sizeof(vabuf), "%skey_%d.d0si%s", *fs_userdir ? fs_userdir : fs_basedir, keygen_i, sessionid.string), "wb", false);
1131 Con_Printf("Cannot open key_%d.d0si%s\n", keygen_i, sessionid.string);
1133 SV_UnlockThreadMutex();
1136 FS_Write(f, buf2, buf2size);
1139 Con_Printf("Saved to key_%d.d0si%s\n", keygen_i, sessionid.string);
1141 SV_UnlockThreadMutex();
1144 static void Crypto_KeyGen_f(void)
1149 static char buf[8192];
1150 static char buf2[8192];
1152 size_t buf2l, buf2pos;
1157 if(!d0_blind_id_dll)
1159 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1164 Con_Printf("usage:\n%s id url\n", Cmd_Argv(0));
1167 SV_LockThreadMutex();
1169 i = atoi(Cmd_Argv(1));
1172 Con_Printf("there is no public key %d\n", i);
1173 SV_UnlockThreadMutex();
1178 Con_Printf("there is already a keygen run on the way\n");
1179 SV_UnlockThreadMutex();
1184 // how to START the keygenning...
1185 if(pubkeys_havepriv[keygen_i])
1187 if(pubkeys_havesig[keygen_i])
1189 Con_Printf("there is already a signed private key for %d\n", i);
1191 SV_UnlockThreadMutex();
1194 // if we get here, we only need a signature, no new keygen run needed
1195 Con_Printf("Only need a signature for an existing key...\n");
1199 // we also need a new ID itself
1200 if(!qd0_blind_id_generate_private_id_start(pubkeys[keygen_i]))
1202 Con_Printf("d0_blind_id_start failed\n");
1204 SV_UnlockThreadMutex();
1207 // verify the key we just got (just in case)
1208 if(!qd0_blind_id_verify_private_id(pubkeys[keygen_i]))
1210 Con_Printf("d0_blind_id_verify_private_id failed\n");
1212 SV_UnlockThreadMutex();
1215 // we have a valid key now!
1216 // make the rest of crypto.c know that
1218 if(qd0_blind_id_fingerprint64_public_id(pubkeys[keygen_i], pubkeys_priv_fp64[keygen_i], &len2)) // keeps final NUL
1220 Con_Printf("Generated private ID key_%d.d0pk (public key fingerprint: %s)\n", keygen_i, pubkeys_priv_fp64[keygen_i]);
1221 pubkeys_havepriv[keygen_i] = true;
1222 strlcat(crypto_idstring_buf, va(vabuf, sizeof(vabuf), " %s@%s", pubkeys_priv_fp64[keygen_i], pubkeys_fp64[keygen_i]), sizeof(crypto_idstring_buf));
1223 crypto_idstring = crypto_idstring_buf;
1224 Crypto_BuildChallengeAppend();
1226 // write the key to disk
1229 if(!qd0_blind_id_write_private_id(pubkeys[keygen_i], buf, &l[0]))
1231 Con_Printf("d0_blind_id_write_private_id failed\n");
1233 SV_UnlockThreadMutex();
1236 if(!(buf2size = Crypto_UnParsePack(buf2, sizeof(buf2), FOURCC_D0SI, p, l, 1)))
1238 Con_Printf("Crypto_UnParsePack failed\n");
1240 SV_UnlockThreadMutex();
1244 FS_CreatePath(va(vabuf, sizeof(vabuf), "%skey_%d.d0si%s", *fs_userdir ? fs_userdir : fs_basedir, keygen_i, sessionid.string));
1245 f = FS_SysOpen(va(vabuf, sizeof(vabuf), "%skey_%d.d0si%s", *fs_userdir ? fs_userdir : fs_basedir, keygen_i, sessionid.string), "wb", false);
1248 Con_Printf("Cannot open key_%d.d0si%s\n", keygen_i, sessionid.string);
1250 SV_UnlockThreadMutex();
1253 FS_Write(f, buf2, buf2size);
1256 f = FS_SysOpen(va(vabuf, sizeof(vabuf), "%skey_%d-public-fp%s.txt", *fs_userdir ? fs_userdir : fs_basedir, keygen_i, sessionid.string), "w", false);
1259 // we ignore errors for this file, as it's not necessary to have
1260 FS_Write(f, pubkeys_priv_fp64[keygen_i], FP64_SIZE);
1261 FS_Write(f, "\n", 1);
1265 Con_Printf("Saved unsigned key to key_%d.d0si%s\n", keygen_i, sessionid.string);
1269 if(!qd0_blind_id_generate_private_id_request(pubkeys[keygen_i], buf, &l[0]))
1271 Con_Printf("d0_blind_id_generate_private_id_request failed\n");
1273 SV_UnlockThreadMutex();
1276 buf2pos = strlen(Cmd_Argv(2));
1277 memcpy(buf2, Cmd_Argv(2), buf2pos);
1278 if(!(buf2l = Crypto_UnParsePack(buf2 + buf2pos, sizeof(buf2) - buf2pos - 1, FOURCC_D0IQ, p, l, 1)))
1280 Con_Printf("Crypto_UnParsePack failed\n");
1282 SV_UnlockThreadMutex();
1285 if(!(buf2l = base64_encode((unsigned char *) (buf2 + buf2pos), buf2l, sizeof(buf2) - buf2pos - 1)))
1287 Con_Printf("base64_encode failed\n");
1289 SV_UnlockThreadMutex();
1294 if(!Curl_Begin_ToMemory(buf2, 0, (unsigned char *) keygen_buf, sizeof(keygen_buf), Crypto_KeyGen_Finished, NULL))
1296 Con_Printf("curl failed\n");
1298 SV_UnlockThreadMutex();
1301 Con_Printf("Signature generation in progress...\n");
1302 SV_UnlockThreadMutex();
1307 static void Crypto_Reload_f(void)
1309 Crypto_ClearHostKeys();
1310 Crypto_UnloadKeys();
1314 static void Crypto_Keys_f(void)
1317 if(!d0_blind_id_dll)
1319 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1322 for(i = 0; i < MAX_PUBKEYS; ++i)
1326 Con_Printf("%2d: public key key_%d.d0pk (fingerprint: %s)\n", i, i, pubkeys_fp64[i]);
1327 if(pubkeys_havepriv[i])
1329 Con_Printf(" private ID key_%d.d0si%s (public key fingerprint: %s)\n", i, sessionid.string, pubkeys_priv_fp64[i]);
1330 if(!pubkeys_havesig[i])
1331 Con_Printf(" NOTE: this ID has not yet been signed!\n");
1337 static void Crypto_HostKeys_f(void)
1340 crypto_storedhostkey_t *hk;
1343 if(!d0_blind_id_dll)
1345 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1348 for(i = 0; i < CRYPTO_HOSTKEY_HASHSIZE; ++i)
1350 for(hk = crypto_storedhostkey_hashtable[i]; hk; hk = hk->next)
1352 LHNETADDRESS_ToString(&hk->addr, buf, sizeof(buf), 1);
1353 Con_Printf("%d %s@%.*s %s\n",
1356 crypto_keyfp_recommended_length, pubkeys_fp64[hk->keyid],
1362 static void Crypto_HostKey_Clear_f(void)
1364 lhnetaddress_t addr;
1367 if(!d0_blind_id_dll)
1369 Con_Print("libd0_blind_id DLL not found, this command is inactive.\n");
1373 for(i = 1; i < Cmd_Argc(); ++i)
1375 LHNETADDRESS_FromString(&addr, Cmd_Argv(i), 26000);
1376 if(Crypto_ClearHostKey(&addr))
1378 Con_Printf("cleared host key for %s\n", Cmd_Argv(i));
1383 void Crypto_Init_Commands(void)
1387 Cmd_AddCommand("crypto_reload", Crypto_Reload_f, "reloads cryptographic keys");
1388 Cmd_AddCommand("crypto_keygen", Crypto_KeyGen_f, "generates and saves a cryptographic key");
1389 Cmd_AddCommand("crypto_keys", Crypto_Keys_f, "lists the loaded keys");
1390 Cmd_AddCommand("crypto_hostkeys", Crypto_HostKeys_f, "lists the cached host keys");
1391 Cmd_AddCommand("crypto_hostkey_clear", Crypto_HostKey_Clear_f, "clears a cached host key");
1392 Cvar_RegisterVariable(&crypto_developer);
1394 Cvar_RegisterVariable(&crypto_aeslevel);
1396 crypto_aeslevel.integer = 0; // make sure
1397 Cvar_RegisterVariable(&crypto_servercpupercent);
1398 Cvar_RegisterVariable(&crypto_servercpumaxtime);
1399 Cvar_RegisterVariable(&crypto_servercpudebug);
1405 static void aescpy(unsigned char *key, const unsigned char *iv, unsigned char *dst, const unsigned char *src, size_t len)
1407 const unsigned char *xorpos = iv;
1408 unsigned char xorbuf[16];
1409 unsigned long rk[D0_RIJNDAEL_RKLENGTH(DHKEY_SIZE * 8)];
1411 qd0_rijndael_setup_encrypt(rk, key, DHKEY_SIZE * 8);
1414 for(i = 0; i < 16; ++i)
1415 xorbuf[i] = src[i] ^ xorpos[i];
1416 qd0_rijndael_encrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), xorbuf, dst);
1424 for(i = 0; i < len; ++i)
1425 xorbuf[i] = src[i] ^ xorpos[i];
1427 xorbuf[i] = xorpos[i];
1428 qd0_rijndael_encrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), xorbuf, dst);
1431 static void seacpy(unsigned char *key, const unsigned char *iv, unsigned char *dst, const unsigned char *src, size_t len)
1433 const unsigned char *xorpos = iv;
1434 unsigned char xorbuf[16];
1435 unsigned long rk[D0_RIJNDAEL_RKLENGTH(DHKEY_SIZE * 8)];
1437 qd0_rijndael_setup_decrypt(rk, key, DHKEY_SIZE * 8);
1440 qd0_rijndael_decrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), src, xorbuf);
1441 for(i = 0; i < 16; ++i)
1442 dst[i] = xorbuf[i] ^ xorpos[i];
1450 qd0_rijndael_decrypt(rk, D0_RIJNDAEL_NROUNDS(DHKEY_SIZE * 8), src, xorbuf);
1451 for(i = 0; i < len; ++i)
1452 dst[i] = xorbuf[i] ^ xorpos[i];
1456 // NOTE: we MUST avoid the following begins of the packet:
1457 // 1. 0xFF, 0xFF, 0xFF, 0xFF
1458 // 2. 0x80, 0x00, length/256, length%256
1459 // this luckily does NOT affect AES mode, where the first byte always is in the range from 0x00 to 0x0F
1460 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)
1462 unsigned char h[32];
1464 if(crypto->authenticated)
1468 // AES packet = 1 byte length overhead, 15 bytes from HMAC-SHA-256, data, 0..15 bytes padding
1469 // 15 bytes HMAC-SHA-256 (112bit) suffice as the attacker can't do more than forge a random-looking packet
1470 // HMAC is needed to not leak information about packet content
1471 if(developer_networking.integer)
1473 Con_Print("To be encrypted:\n");
1474 Com_HexDumpToConsole((const unsigned char *) data_src, len_src);
1476 if(len_src + 32 > len || !HMAC_SHA256_32BYTES(h, (const unsigned char *) data_src, len_src, crypto->dhkey, DHKEY_SIZE))
1478 Con_Printf("Crypto_EncryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1481 *len_dst = ((len_src + 15) / 16) * 16 + 16; // add 16 for HMAC, then round to 16-size for AES
1482 ((unsigned char *) data_dst)[0] = *len_dst - len_src;
1483 memcpy(((unsigned char *) data_dst)+1, h, 15);
1484 aescpy(crypto->dhkey, (const unsigned char *) data_dst, ((unsigned char *) data_dst) + 16, (const unsigned char *) data_src, len_src);
1489 // HMAC packet = 16 bytes HMAC-SHA-256 (truncated to 128 bits), data
1490 if(len_src + 16 > len || !HMAC_SHA256_32BYTES(h, (const unsigned char *) data_src, len_src, crypto->dhkey, DHKEY_SIZE))
1492 Con_Printf("Crypto_EncryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1495 *len_dst = len_src + 16;
1496 memcpy(data_dst, h, 16);
1497 memcpy(((unsigned char *) data_dst) + 16, (unsigned char *) data_src, len_src);
1499 // handle the "avoid" conditions:
1500 i = BuffBigLong((unsigned char *) data_dst);
1502 (i == (int)0xFFFFFFFF) // avoid QW control packet
1504 (i == (int)0x80000000 + (int)*len_dst) // avoid NQ control packet
1506 *(unsigned char *)data_dst ^= 0x80; // this will ALWAYS fix it
1517 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)
1519 unsigned char h[32];
1522 // silently handle non-crypto packets
1523 i = BuffBigLong((unsigned char *) data_src);
1525 (i == (int)0xFFFFFFFF) // avoid QW control packet
1527 (i == (int)0x80000000 + (int)len_src) // avoid NQ control packet
1531 if(crypto->authenticated)
1535 if(len_src < 16 || ((len_src - 16) % 16))
1537 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1540 *len_dst = len_src - ((unsigned char *) data_src)[0];
1541 if(len < *len_dst || *len_dst > len_src - 16)
1543 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d->%d bytes out)\n", (int) len_src, (int) *len_dst, (int) len);
1546 seacpy(crypto->dhkey, (unsigned char *) data_src, (unsigned char *) data_dst, ((const unsigned char *) data_src) + 16, *len_dst);
1548 if(!HMAC_SHA256_32BYTES(h, (const unsigned char *) data_dst, *len_dst, crypto->dhkey, DHKEY_SIZE))
1550 Con_Printf("HMAC fail\n");
1553 if(memcmp(((const unsigned char *) data_src)+1, h, 15)) // ignore first byte, used for length
1555 Con_Printf("HMAC mismatch\n");
1558 if(developer_networking.integer)
1560 Con_Print("Decrypted:\n");
1561 Com_HexDumpToConsole((const unsigned char *) data_dst, *len_dst);
1563 return data_dst; // no need to copy
1569 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d bytes out)\n", (int) len_src, (int) len);
1572 *len_dst = len_src - 16;
1575 Con_Printf("Crypto_DecryptPacket failed (not enough space: %d bytes in, %d->%d bytes out)\n", (int) len_src, (int) *len_dst, (int) len);
1578 //memcpy(data_dst, data_src + 16, *len_dst);
1579 if(!HMAC_SHA256_32BYTES(h, ((const unsigned char *) data_src) + 16, *len_dst, crypto->dhkey, DHKEY_SIZE))
1581 Con_Printf("HMAC fail\n");
1582 Com_HexDumpToConsole((const unsigned char *) data_src, len_src);
1586 if(memcmp((const unsigned char *) data_src, h, 16)) // ignore first byte, used for length
1588 // undo the "avoid conditions"
1590 (i == (int)0x7FFFFFFF) // avoided QW control packet
1592 (i == (int)0x00000000 + (int)len_src) // avoided NQ control packet
1595 // do the avoidance on the hash too
1597 if(memcmp((const unsigned char *) data_src, h, 16)) // ignore first byte, used for length
1599 Con_Printf("HMAC mismatch\n");
1600 Com_HexDumpToConsole((const unsigned char *) data_src, len_src);
1606 Con_Printf("HMAC mismatch\n");
1607 Com_HexDumpToConsole((const unsigned char *) data_src, len_src);
1611 return ((const unsigned char *) data_src) + 16; // no need to copy, so data_dst is not used
1622 const char *Crypto_GetInfoResponseDataString(void)
1624 crypto_idstring_buf[0] = '0' + crypto_aeslevel.integer;
1625 return crypto_idstring;
1629 qboolean Crypto_ServerAppendToChallenge(const char *data_in, size_t len_in, char *data_out, size_t *len_out, size_t maxlen_out)
1631 // cheap op, all is precomputed
1632 if(!d0_blind_id_dll)
1633 return false; // no support
1635 if(maxlen_out <= *len_out + challenge_append_length)
1637 memcpy(data_out + *len_out, challenge_append, challenge_append_length);
1638 *len_out += challenge_append_length;
1642 static int Crypto_ServerError(char *data_out, size_t *len_out, const char *msg, const char *msg_client)
1646 Con_DPrintf("rejecting client: %s\n", msg);
1648 dpsnprintf(data_out, *len_out, "reject %s", msg_client);
1649 *len_out = strlen(data_out);
1650 return CRYPTO_DISCARD;
1653 static int Crypto_SoftServerError(char *data_out, size_t *len_out, const char *msg)
1656 Con_DPrintf("%s\n", msg);
1657 return CRYPTO_DISCARD;
1660 static int Crypto_ServerParsePacket_Internal(const char *data_in, size_t len_in, char *data_out, size_t *len_out, lhnetaddress_t *peeraddress)
1662 // if "connect": reject if in the middle of crypto handshake
1663 crypto_t *crypto = NULL;
1664 char *data_out_p = data_out;
1665 const char *string = data_in;
1669 char infostringvalue[MAX_INPUTLINE];
1672 if(!d0_blind_id_dll)
1673 return CRYPTO_NOMATCH; // no support
1675 if (len_in > 8 && !memcmp(string, "connect\\", 8) && d0_rijndael_dll && crypto_aeslevel.integer >= 3)
1679 // sorry, we have to verify the challenge here to not reflect network spam
1681 if (!(s = InfoString_GetValue(string + 4, "challenge", infostringvalue, sizeof(infostringvalue))))
1682 return CRYPTO_NOMATCH; // will be later accepted if encryption was set up
1683 // validate the challenge
1684 for (i = 0;i < MAX_CHALLENGES;i++)
1685 if(challenge[i].time > 0)
1686 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1688 // if the challenge is not recognized, drop the packet
1689 if (i == MAX_CHALLENGES) // challenge mismatch is silent
1690 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1692 crypto = Crypto_ServerFindInstance(peeraddress, false);
1693 if(!crypto || !crypto->authenticated)
1694 return Crypto_ServerError(data_out, len_out, "This server requires authentication and encryption to be supported by your client", NULL);
1696 else if(len_in > 5 && !memcmp(string, "d0pk\\", 5) && ((LHNETADDRESS_GetAddressType(peeraddress) == LHNETADDRESSTYPE_LOOP) || sv_public.integer > -3))
1698 const char *cnt, *s, *p;
1700 int clientid = -1, serverid = -1;
1701 cnt = InfoString_GetValue(string + 4, "id", infostringvalue, sizeof(infostringvalue));
1702 id = (cnt ? atoi(cnt) : -1);
1703 cnt = InfoString_GetValue(string + 4, "cnt", infostringvalue, sizeof(infostringvalue));
1705 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1706 GetUntilNul(&data_in, &len_in);
1708 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1709 if(!strcmp(cnt, "0"))
1712 if (!(s = InfoString_GetValue(string + 4, "challenge", infostringvalue, sizeof(infostringvalue))))
1713 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1714 // validate the challenge
1715 for (i = 0;i < MAX_CHALLENGES;i++)
1716 if(challenge[i].time > 0)
1717 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1719 // if the challenge is not recognized, drop the packet
1720 if (i == MAX_CHALLENGES) // challenge mismatch is silent
1721 return CRYPTO_DISCARD; // pre-challenge: rather be silent
1723 if (!(s = InfoString_GetValue(string + 4, "aeslevel", infostringvalue, sizeof(infostringvalue))))
1724 aeslevel = 0; // not supported
1726 aeslevel = bound(0, atoi(s), 3);
1727 switch(bound(0, d0_rijndael_dll ? crypto_aeslevel.integer : 0, 3))
1729 default: // dummy, never happens, but to make gcc happy...
1732 return Crypto_ServerError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)", NULL);
1736 aes = (aeslevel >= 2);
1739 aes = (aeslevel >= 1);
1743 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);
1748 p = GetUntilNul(&data_in, &len_in);
1751 for(i = 0; i < MAX_PUBKEYS; ++i)
1754 if(!strcmp(p, pubkeys_fp64[i]))
1755 if(pubkeys_havepriv[i])
1760 return Crypto_ServerError(data_out, len_out, "Invalid server key", NULL);
1762 p = GetUntilNul(&data_in, &len_in);
1765 for(i = 0; i < MAX_PUBKEYS; ++i)
1768 if(!strcmp(p, pubkeys_fp64[i]))
1773 return Crypto_ServerError(data_out, len_out, "Invalid client key", NULL);
1776 crypto = Crypto_ServerFindInstance(peeraddress, true);
1778 return Crypto_ServerError(data_out, len_out, "Could not create a crypto connect instance", NULL);
1780 CDATA->cdata_id = id;
1781 CDATA->s = serverid;
1782 CDATA->c = clientid;
1783 memset(crypto->dhkey, 0, sizeof(crypto->dhkey));
1784 CDATA->challenge[0] = 0;
1785 crypto->client_keyfp[0] = 0;
1786 crypto->client_idfp[0] = 0;
1787 crypto->server_keyfp[0] = 0;
1788 crypto->server_idfp[0] = 0;
1789 crypto->use_aes = aes != 0;
1793 // I am the server, and my key is ok... so let's set server_keyfp and server_idfp
1794 strlcpy(crypto->server_keyfp, pubkeys_fp64[CDATA->s], sizeof(crypto->server_keyfp));
1795 strlcpy(crypto->server_idfp, pubkeys_priv_fp64[CDATA->s], sizeof(crypto->server_idfp));
1798 CDATA->id = qd0_blind_id_new();
1802 return Crypto_ServerError(data_out, len_out, "d0_blind_id_new failed", "Internal error");
1804 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->s]))
1807 return Crypto_ServerError(data_out, len_out, "d0_blind_id_copy failed", "Internal error");
1809 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\1\\id\\%d\\aes\\%d", CDATA->cdata_id, crypto->use_aes));
1810 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
1813 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_start failed", "Internal error");
1815 CDATA->next_step = 2;
1816 data_out_p += *len_out;
1817 *len_out = data_out_p - data_out;
1818 return CRYPTO_DISCARD;
1820 else if(CDATA->c >= 0)
1823 CDATA->id = qd0_blind_id_new();
1827 return Crypto_ServerError(data_out, len_out, "d0_blind_id_new failed", "Internal error");
1829 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
1832 return Crypto_ServerError(data_out, len_out, "d0_blind_id_copy failed", "Internal error");
1834 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\5\\id\\%d\\aes\\%d", CDATA->cdata_id, crypto->use_aes));
1835 if(!qd0_blind_id_authenticate_with_private_id_challenge(CDATA->id, true, false, data_in, len_in, data_out_p, len_out, &status))
1838 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_challenge failed", "Internal error");
1840 CDATA->next_step = 6;
1841 data_out_p += *len_out;
1842 *len_out = data_out_p - data_out;
1843 return CRYPTO_DISCARD;
1848 return Crypto_ServerError(data_out, len_out, "Missing client and server key", NULL);
1851 else if(!strcmp(cnt, "2"))
1854 crypto = Crypto_ServerFindInstance(peeraddress, false);
1856 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1858 if(CDATA->cdata_id != id)
1859 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
1860 if(CDATA->next_step != 2)
1861 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
1863 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\3\\id\\%d", CDATA->cdata_id));
1864 if(!qd0_blind_id_authenticate_with_private_id_response(CDATA->id, data_in, len_in, data_out_p, len_out))
1867 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_response failed", "Internal error");
1869 fpbuflen = DHKEY_SIZE;
1870 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) crypto->dhkey, &fpbuflen))
1873 return Crypto_ServerError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed", "Internal error");
1877 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
1880 return Crypto_ServerError(data_out, len_out, "d0_blind_id_copy failed", "Internal error");
1882 CDATA->next_step = 4;
1886 // session key is FINISHED (no server part is to be expected)! By this, all keys are set up
1887 crypto->authenticated = true;
1888 CDATA->next_step = 0;
1890 data_out_p += *len_out;
1891 *len_out = data_out_p - data_out;
1892 return CRYPTO_DISCARD;
1894 else if(!strcmp(cnt, "4"))
1896 crypto = Crypto_ServerFindInstance(peeraddress, false);
1898 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1900 if(CDATA->cdata_id != id)
1901 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
1902 if(CDATA->next_step != 4)
1903 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
1904 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\5\\id\\%d", CDATA->cdata_id));
1905 if(!qd0_blind_id_authenticate_with_private_id_challenge(CDATA->id, true, false, data_in, len_in, data_out_p, len_out, &status))
1908 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_challenge failed", "Internal error");
1910 CDATA->next_step = 6;
1911 data_out_p += *len_out;
1912 *len_out = data_out_p - data_out;
1913 return CRYPTO_DISCARD;
1915 else if(!strcmp(cnt, "6"))
1917 static char msgbuf[32];
1918 size_t msgbuflen = sizeof(msgbuf);
1921 unsigned char dhkey[DHKEY_SIZE];
1922 crypto = Crypto_ServerFindInstance(peeraddress, false);
1924 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1926 if(CDATA->cdata_id != id)
1927 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
1928 if(CDATA->next_step != 6)
1929 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
1931 if(!qd0_blind_id_authenticate_with_private_id_verify(CDATA->id, data_in, len_in, msgbuf, &msgbuflen, &status))
1934 return Crypto_ServerError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_verify failed (authentication error)", "Authentication error");
1937 strlcpy(crypto->client_keyfp, pubkeys_fp64[CDATA->c], sizeof(crypto->client_keyfp));
1939 crypto->client_keyfp[0] = 0;
1940 memset(crypto->client_idfp, 0, sizeof(crypto->client_idfp));
1941 fpbuflen = FP64_SIZE;
1942 if(!qd0_blind_id_fingerprint64_public_id(CDATA->id, crypto->client_idfp, &fpbuflen))
1945 return Crypto_ServerError(data_out, len_out, "d0_blind_id_fingerprint64_public_id failed", "Internal error");
1947 fpbuflen = DHKEY_SIZE;
1948 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) dhkey, &fpbuflen))
1951 return Crypto_ServerError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed", "Internal error");
1953 // XOR the two DH keys together to make one
1954 for(i = 0; i < DHKEY_SIZE; ++i)
1955 crypto->dhkey[i] ^= dhkey[i];
1957 // session key is FINISHED (no server part is to be expected)! By this, all keys are set up
1958 crypto->authenticated = true;
1959 CDATA->next_step = 0;
1960 // send a challenge-less challenge
1961 PutWithNul(&data_out_p, len_out, "challenge ");
1962 *len_out = data_out_p - data_out;
1963 --*len_out; // remove NUL terminator
1964 return CRYPTO_MATCH;
1966 return CRYPTO_NOMATCH; // pre-challenge, rather be silent
1968 return CRYPTO_NOMATCH;
1971 int Crypto_ServerParsePacket(const char *data_in, size_t len_in, char *data_out, size_t *len_out, lhnetaddress_t *peeraddress)
1975 static double complain_time = 0;
1977 qboolean do_time = false;
1978 qboolean do_reject = false;
1979 char infostringvalue[MAX_INPUTLINE];
1980 if(crypto_servercpupercent.value > 0 || crypto_servercpumaxtime.value > 0)
1981 if(len_in > 5 && !memcmp(data_in, "d0pk\\", 5))
1984 cnt = InfoString_GetValue(data_in + 4, "cnt", infostringvalue, sizeof(infostringvalue));
1986 if(!strcmp(cnt, "0"))
1991 // check if we may perform crypto...
1992 if(crypto_servercpupercent.value > 0)
1994 crypto_servercpu_accumulator += (realtime - crypto_servercpu_lastrealtime) * crypto_servercpupercent.value * 0.01;
1995 if(crypto_servercpumaxtime.value)
1996 if(crypto_servercpu_accumulator > crypto_servercpumaxtime.value)
1997 crypto_servercpu_accumulator = crypto_servercpumaxtime.value;
2001 if(crypto_servercpumaxtime.value > 0)
2002 if(realtime != crypto_servercpu_lastrealtime)
2003 crypto_servercpu_accumulator = crypto_servercpumaxtime.value;
2005 crypto_servercpu_lastrealtime = realtime;
2006 if(do_reject && crypto_servercpu_accumulator < 0)
2008 if(realtime > complain_time + 5)
2009 Con_Printf("crypto: cannot perform requested crypto operations; denial service attack or crypto_servercpupercent/crypto_servercpumaxtime are too low\n");
2011 return CRYPTO_DISCARD;
2013 t = Sys_DirtyTime();
2015 ret = Crypto_ServerParsePacket_Internal(data_in, len_in, data_out, len_out, peeraddress);
2018 t = Sys_DirtyTime() - t;if (t < 0.0) t = 0.0; // dirtytime can step backwards
2019 if(crypto_servercpudebug.integer)
2020 Con_Printf("crypto: accumulator was %.1f ms, used %.1f ms for crypto, ", crypto_servercpu_accumulator * 1000, t * 1000);
2021 crypto_servercpu_accumulator -= t;
2022 if(crypto_servercpudebug.integer)
2023 Con_Printf("is %.1f ms\n", crypto_servercpu_accumulator * 1000);
2028 static int Crypto_ClientError(char *data_out, size_t *len_out, const char *msg)
2030 dpsnprintf(data_out, *len_out, "reject %s", msg);
2031 *len_out = strlen(data_out);
2032 return CRYPTO_REPLACE;
2035 static int Crypto_SoftClientError(char *data_out, size_t *len_out, const char *msg)
2038 Con_Printf("%s\n", msg);
2039 return CRYPTO_DISCARD;
2042 int Crypto_ClientParsePacket(const char *data_in, size_t len_in, char *data_out, size_t *len_out, lhnetaddress_t *peeraddress)
2044 crypto_t *crypto = &cls.crypto;
2045 const char *string = data_in;
2048 char *data_out_p = data_out;
2050 char infostringvalue[MAX_INPUTLINE];
2053 if(!d0_blind_id_dll)
2054 return CRYPTO_NOMATCH; // no support
2056 // if "challenge": verify challenge, and discard message, send next crypto protocol message instead
2057 // otherwise, just handle actual protocol messages
2059 if (len_in == 6 && !memcmp(string, "accept", 6) && cls.connect_trying && d0_rijndael_dll)
2061 int wantserverid = -1;
2062 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL);
2063 if(!crypto || !crypto->authenticated) // we ALSO get here if we are using an encrypted connection, so let's rule this out
2065 if(wantserverid >= 0)
2066 return Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present");
2067 if(crypto_aeslevel.integer >= 3)
2068 return Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)");
2070 return CRYPTO_NOMATCH;
2072 else if (len_in >= 1 && string[0] == 'j' && cls.connect_trying && d0_rijndael_dll)
2074 int wantserverid = -1;
2075 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL);
2076 //if(!crypto || !crypto->authenticated)
2078 if(wantserverid >= 0)
2079 return Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present");
2080 if(crypto_aeslevel.integer >= 3)
2081 return Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)");
2083 return CRYPTO_NOMATCH;
2085 else if (len_in >= 5 && BuffLittleLong((unsigned char *) string) == ((int)NETFLAG_CTL | (int)len_in))
2087 int wantserverid = -1;
2089 // these three are harmless
2090 if(string[4] == CCREP_SERVER_INFO)
2091 return CRYPTO_NOMATCH;
2092 if(string[4] == CCREP_PLAYER_INFO)
2093 return CRYPTO_NOMATCH;
2094 if(string[4] == CCREP_RULE_INFO)
2095 return CRYPTO_NOMATCH;
2097 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, NULL, 0, NULL);
2098 //if(!crypto || !crypto->authenticated)
2100 if(wantserverid >= 0)
2101 return Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present");
2102 if(crypto_aeslevel.integer >= 3)
2103 return Crypto_ClientError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)");
2105 return CRYPTO_NOMATCH;
2107 else if (len_in >= 13 && !memcmp(string, "infoResponse\x0A", 13))
2109 s = InfoString_GetValue(string + 13, "d0_blind_id", infostringvalue, sizeof(infostringvalue));
2111 Crypto_StoreHostKey(peeraddress, s, true);
2112 return CRYPTO_NOMATCH;
2114 else if (len_in >= 15 && !memcmp(string, "statusResponse\x0A", 15))
2118 p = strchr(string + 15, '\n');
2122 * (char *) p = 0; // cut off the string there
2124 s = InfoString_GetValue(string + 15, "d0_blind_id", infostringvalue, sizeof(infostringvalue));
2126 Crypto_StoreHostKey(peeraddress, s, true);
2129 * (char *) p = save;
2130 // invoking those nasal demons again (do not run this on the DS9k)
2132 return CRYPTO_NOMATCH;
2134 else if(len_in > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
2136 const char *vlen_blind_id_ptr = NULL;
2137 size_t len_blind_id_ptr = 0;
2139 const char *challenge = data_in + 10;
2142 int clientid = -1, serverid = -1, wantserverid = -1;
2143 qboolean server_can_auth = true;
2144 char wantserver_idfp[FP64_SIZE+1];
2145 int wantserver_aeslevel;
2147 // if we have a stored host key for the server, assume serverid to already be selected!
2148 // (the loop will refuse to overwrite this one then)
2149 wantserver_idfp[0] = 0;
2150 Crypto_RetrieveHostKey(&cls.connect_address, &wantserverid, NULL, 0, wantserver_idfp, sizeof(wantserver_idfp), &wantserver_aeslevel);
2151 // requirement: wantserver_idfp is a full ID if wantserverid set
2153 // if we leave, we have to consider the connection
2154 // unauthenticated; NOTE: this may be faked by a clever
2155 // attacker to force an unauthenticated connection; so we have
2156 // a safeguard check in place when encryption is required too
2157 // in place, or when authentication is required by the server
2158 crypto->authenticated = false;
2160 GetUntilNul(&data_in, &len_in);
2162 return (wantserverid >= 0) ? Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though a host key is present") :
2163 (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) :
2166 // FTEQW extension protocol
2169 k = Crypto_LittleLong(data_in);
2170 v = Crypto_LittleLong(data_in + 4);
2178 k = Crypto_LittleLong(data_in);
2183 case PROTOCOL_D0_BLIND_ID:
2184 vlen_blind_id_ptr = data_in;
2185 len_blind_id_ptr = v;
2197 if(!vlen_blind_id_ptr)
2198 return (wantserverid >= 0) ? Crypto_ClientError(data_out, len_out, "Server tried an unauthenticated connection even though authentication is required") :
2199 (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) :
2202 data_in = vlen_blind_id_ptr;
2203 len_in = len_blind_id_ptr;
2205 // parse fingerprints
2206 // once we found a fingerprint we can auth to (ANY), select it as clientfp
2207 // once we found a fingerprint in the first list that we know, select it as serverfp
2211 p = GetUntilNul(&data_in, &len_in);
2216 if(!server_can_auth)
2217 break; // other protocol message may follow
2218 server_can_auth = false;
2223 for(i = 0; i < MAX_PUBKEYS; ++i)
2226 if(!strcmp(p, pubkeys_fp64[i]))
2228 if(pubkeys_havepriv[i])
2233 if(wantserverid < 0 || i == wantserverid)
2237 if(clientid >= 0 && serverid >= 0)
2241 // if stored host key is not found:
2242 if(wantserverid >= 0 && serverid < 0)
2243 return Crypto_ClientError(data_out, len_out, "Server CA does not match stored host key, refusing to connect");
2245 if(serverid >= 0 || clientid >= 0)
2247 // TODO at this point, fill clientside crypto struct!
2249 CDATA->cdata_id = ++cdata_id;
2250 CDATA->s = serverid;
2251 CDATA->c = clientid;
2252 memset(crypto->dhkey, 0, sizeof(crypto->dhkey));
2253 strlcpy(CDATA->challenge, challenge, sizeof(CDATA->challenge));
2254 crypto->client_keyfp[0] = 0;
2255 crypto->client_idfp[0] = 0;
2256 crypto->server_keyfp[0] = 0;
2257 crypto->server_idfp[0] = 0;
2258 memcpy(CDATA->wantserver_idfp, wantserver_idfp, sizeof(crypto->server_idfp));
2260 if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2261 switch(bound(0, d0_rijndael_dll ? crypto_aeslevel.integer : 0, 3))
2263 default: // dummy, never happens, but to make gcc happy...
2265 if(wantserver_aeslevel >= 3)
2266 return Crypto_ServerError(data_out, len_out, "This server requires encryption to be not required (crypto_aeslevel <= 2)", NULL);
2267 CDATA->wantserver_aes = false;
2270 CDATA->wantserver_aes = (wantserver_aeslevel >= 2);
2273 CDATA->wantserver_aes = (wantserver_aeslevel >= 1);
2276 if(wantserver_aeslevel <= 0)
2277 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);
2278 CDATA->wantserver_aes = true;
2282 // build outgoing message
2283 // append regular stuff
2284 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\0\\id\\%d\\aeslevel\\%d\\challenge\\%s", CDATA->cdata_id, d0_rijndael_dll ? crypto_aeslevel.integer : 0, challenge));
2285 PutWithNul(&data_out_p, len_out, serverid >= 0 ? pubkeys_fp64[serverid] : "");
2286 PutWithNul(&data_out_p, len_out, clientid >= 0 ? pubkeys_fp64[clientid] : "");
2290 // I am the client, and my key is ok... so let's set client_keyfp and client_idfp
2291 strlcpy(crypto->client_keyfp, pubkeys_fp64[CDATA->c], sizeof(crypto->client_keyfp));
2292 strlcpy(crypto->client_idfp, pubkeys_priv_fp64[CDATA->c], sizeof(crypto->client_idfp));
2298 CDATA->id = qd0_blind_id_new();
2302 return Crypto_ClientError(data_out, len_out, "d0_blind_id_new failed");
2304 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->s]))
2307 return Crypto_ClientError(data_out, len_out, "d0_blind_id_copy failed");
2309 CDATA->next_step = 1;
2310 *len_out = data_out_p - data_out;
2312 else if(clientid >= 0)
2314 // skip over server auth, perform client auth only
2316 CDATA->id = qd0_blind_id_new();
2320 return Crypto_ClientError(data_out, len_out, "d0_blind_id_new failed");
2322 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
2325 return Crypto_ClientError(data_out, len_out, "d0_blind_id_copy failed");
2327 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
2330 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_start failed");
2332 CDATA->next_step = 5;
2333 data_out_p += *len_out;
2334 *len_out = data_out_p - data_out;
2337 *len_out = data_out_p - data_out;
2339 return CRYPTO_DISCARD;
2343 if(wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2344 if(wantserver_aeslevel >= 3)
2345 return Crypto_ClientError(data_out, len_out, "Server insists on encryption, but neither can authenticate to the other");
2346 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) :
2350 else if(len_in > 5 && !memcmp(string, "d0pk\\", 5) && cls.connect_trying)
2354 cnt = InfoString_GetValue(string + 4, "id", infostringvalue, sizeof(infostringvalue));
2355 id = (cnt ? atoi(cnt) : -1);
2356 cnt = InfoString_GetValue(string + 4, "cnt", infostringvalue, sizeof(infostringvalue));
2358 return Crypto_ClientError(data_out, len_out, "d0pk\\ message without cnt");
2359 GetUntilNul(&data_in, &len_in);
2361 return Crypto_ClientError(data_out, len_out, "d0pk\\ message without attachment");
2363 if(!strcmp(cnt, "1"))
2366 if(CDATA->cdata_id != id)
2367 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
2368 if(CDATA->next_step != 1)
2369 return Crypto_SoftClientError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
2371 cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
2373 if((s = InfoString_GetValue(string + 4, "aes", infostringvalue, sizeof(infostringvalue))))
2377 // we CANNOT toggle the AES status any more!
2378 // as the server already decided
2379 if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2380 if(!aes && CDATA->wantserver_aes)
2383 return Crypto_ClientError(data_out, len_out, "Stored host key requires encryption, but server did not enable encryption");
2385 if(aes && (!d0_rijndael_dll || crypto_aeslevel.integer <= 0))
2388 return Crypto_ClientError(data_out, len_out, "Server insists on encryption too hard");
2390 if(!aes && (d0_rijndael_dll && crypto_aeslevel.integer >= 3))
2393 return Crypto_ClientError(data_out, len_out, "Server insists on plaintext too hard");
2395 crypto->use_aes = aes != 0;
2397 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\2\\id\\%d", CDATA->cdata_id));
2398 if(!qd0_blind_id_authenticate_with_private_id_challenge(CDATA->id, true, false, data_in, len_in, data_out_p, len_out, &status))
2401 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_challenge failed");
2403 CDATA->next_step = 3;
2404 data_out_p += *len_out;
2405 *len_out = data_out_p - data_out;
2406 return CRYPTO_DISCARD;
2408 else if(!strcmp(cnt, "3"))
2410 static char msgbuf[32];
2411 size_t msgbuflen = sizeof(msgbuf);
2415 if(CDATA->cdata_id != id)
2416 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
2417 if(CDATA->next_step != 3)
2418 return Crypto_SoftClientError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
2420 cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
2422 if(!qd0_blind_id_authenticate_with_private_id_verify(CDATA->id, data_in, len_in, msgbuf, &msgbuflen, &status))
2425 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_verify failed (server authentication error)");
2428 strlcpy(crypto->server_keyfp, pubkeys_fp64[CDATA->s], sizeof(crypto->server_keyfp));
2430 crypto->server_keyfp[0] = 0;
2431 memset(crypto->server_idfp, 0, sizeof(crypto->server_idfp));
2432 fpbuflen = FP64_SIZE;
2433 if(!qd0_blind_id_fingerprint64_public_id(CDATA->id, crypto->server_idfp, &fpbuflen))
2436 return Crypto_ClientError(data_out, len_out, "d0_blind_id_fingerprint64_public_id failed");
2438 if(CDATA->wantserver_idfp[0])
2439 if(memcmp(CDATA->wantserver_idfp, crypto->server_idfp, sizeof(crypto->server_idfp)))
2442 return Crypto_ClientError(data_out, len_out, "Server ID does not match stored host key, refusing to connect");
2444 fpbuflen = DHKEY_SIZE;
2445 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) crypto->dhkey, &fpbuflen))
2448 return Crypto_ClientError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed");
2451 // cache the server key
2452 Crypto_StoreHostKey(&cls.connect_address, va(vabuf, sizeof(vabuf), "%d %s@%s", crypto->use_aes ? 1 : 0, crypto->server_idfp, pubkeys_fp64[CDATA->s]), false);
2456 // client will auth next
2457 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\4\\id\\%d", CDATA->cdata_id));
2458 if(!qd0_blind_id_copy(CDATA->id, pubkeys[CDATA->c]))
2461 return Crypto_ClientError(data_out, len_out, "d0_blind_id_copy failed");
2463 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
2466 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_start failed");
2468 CDATA->next_step = 5;
2469 data_out_p += *len_out;
2470 *len_out = data_out_p - data_out;
2471 return CRYPTO_DISCARD;
2475 // session key is FINISHED (no server part is to be expected)! By this, all keys are set up
2476 crypto->authenticated = true;
2477 CDATA->next_step = 0;
2478 // assume we got the empty challenge to finish the protocol
2479 PutWithNul(&data_out_p, len_out, "challenge ");
2480 *len_out = data_out_p - data_out;
2481 --*len_out; // remove NUL terminator
2482 return CRYPTO_REPLACE;
2485 else if(!strcmp(cnt, "5"))
2488 unsigned char dhkey[DHKEY_SIZE];
2492 if(CDATA->cdata_id != id)
2493 return Crypto_SoftServerError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\id\\%d when expecting %d", id, CDATA->cdata_id));
2494 if(CDATA->next_step != 5)
2495 return Crypto_SoftClientError(data_out, len_out, va(vabuf, sizeof(vabuf), "Got d0pk\\cnt\\%s when expecting %d", cnt, CDATA->next_step));
2497 cls.connect_nextsendtime = max(cls.connect_nextsendtime, realtime + 1); // prevent "hammering"
2499 if(CDATA->s < 0) // only if server didn't auth
2501 if((s = InfoString_GetValue(string + 4, "aes", infostringvalue, sizeof(infostringvalue))))
2505 if(CDATA->wantserver_idfp[0]) // if we know a host key, honor its encryption setting
2506 if(!aes && CDATA->wantserver_aes)
2509 return Crypto_ClientError(data_out, len_out, "Stored host key requires encryption, but server did not enable encryption");
2511 if(aes && (!d0_rijndael_dll || crypto_aeslevel.integer <= 0))
2514 return Crypto_ClientError(data_out, len_out, "Server insists on encryption too hard");
2516 if(!aes && (d0_rijndael_dll && crypto_aeslevel.integer >= 3))
2519 return Crypto_ClientError(data_out, len_out, "Server insists on plaintext too hard");
2521 crypto->use_aes = aes != 0;
2524 PutWithNul(&data_out_p, len_out, va(vabuf, sizeof(vabuf), "d0pk\\cnt\\6\\id\\%d", CDATA->cdata_id));
2525 if(!qd0_blind_id_authenticate_with_private_id_response(CDATA->id, data_in, len_in, data_out_p, len_out))
2528 return Crypto_ClientError(data_out, len_out, "d0_blind_id_authenticate_with_private_id_response failed");
2530 fpbuflen = DHKEY_SIZE;
2531 if(!qd0_blind_id_sessionkey_public_id(CDATA->id, (char *) dhkey, &fpbuflen))
2534 return Crypto_ClientError(data_out, len_out, "d0_blind_id_sessionkey_public_id failed");
2536 // XOR the two DH keys together to make one
2537 for(i = 0; i < DHKEY_SIZE; ++i)
2538 crypto->dhkey[i] ^= dhkey[i];
2539 // session key is FINISHED! By this, all keys are set up
2540 crypto->authenticated = true;
2541 CDATA->next_step = 0;
2542 data_out_p += *len_out;
2543 *len_out = data_out_p - data_out;
2544 return CRYPTO_DISCARD;
2546 return Crypto_SoftClientError(data_out, len_out, "Got unknown d0_blind_id message from server");
2549 return CRYPTO_NOMATCH;
2552 size_t Crypto_SignData(const void *data, size_t datasize, int keyid, void *signed_data, size_t signed_size)
2554 if(keyid < 0 || keyid >= MAX_PUBKEYS)
2556 if(!pubkeys_havepriv[keyid])
2558 if(qd0_blind_id_sign_with_private_id_sign(pubkeys[keyid], true, false, (const char *)data, datasize, (char *)signed_data, &signed_size))
2563 size_t Crypto_SignDataDetached(const void *data, size_t datasize, int keyid, void *signed_data, size_t signed_size)
2565 if(keyid < 0 || keyid >= MAX_PUBKEYS)
2567 if(!pubkeys_havepriv[keyid])
2569 if(qd0_blind_id_sign_with_private_id_sign_detached(pubkeys[keyid], true, false, (const char *)data, datasize, (char *)signed_data, &signed_size))